tor-commits October 2018

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[torspec/master] Proposal 298: canonicalize family lines
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit a315eed530eefeac89e8a4f3264a090d5bb3033c Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Oct 31 10:48:39 2018 -0400 Proposal 298: canonicalize family lines --- proposals/000-index.txt | 2 ++ proposals/298-canonical-families.txt | 62 ++++++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/proposals/000-index.txt b/proposals/000-index.txt index 661f230..51f56e5 100644 --- a/proposals/000-index.txt +++ b/proposals/000-index.txt @@ -218,6 +218,7 @@ Proposals by number: 295 Using ADL-GCM for relay cryptography (solving the crypto-tagging attack) [OPEN] 296 Have Directory Authorities expose raw bandwidth list files [OPEN] 297 Relaxing the protover-based shutdown rules [OPEN] +298 Putting family lines in canonical form [OPEN] Proposals by status: @@ -250,6 +251,7 @@ Proposals by status: 295 Using ADL-GCM for relay cryptography (solving the crypto-tagging attack) 296 Have Directory Authorities expose raw bandwidth list files 297 Relaxing the protover-based shutdown rules [for 0.3.5.x] + 298 Putting family lines in canonical form [for 0.3.6.x] ACCEPTED: 188 Bridge Guards and other anti-enumeration defenses 249 Allow CREATE cells with >505 bytes of handshake data diff --git a/proposals/298-canonical-families.txt b/proposals/298-canonical-families.txt new file mode 100644 index 0000000..938754d --- /dev/null +++ b/proposals/298-canonical-families.txt @@ -0,0 +1,62 @@ +Filename: 298-canonical-families.txt +Title: Putting family lines in canonical form +Author: Nick Mathewson +Created: 31-Oct-2018 +Status: Open +Target: 0.3.6.x + +1. Introduction + + With ticket #27359, we begin encoding microdescriptor families in + memory in a reference-counted form, so that if 10 relays all list the + same family, their family only needs to be stored once. For large + families, this has the potential to save a lot of RAM -- but only if + the families are the same across those relays. + + Right now, family lines are often encoded in different ways, and + placed into consensuses and microdescriptor lines in whatever format + the relay reported. + + This proposal describes an algorithm that authorities should use + while voting to place families into a canonical format. + + This algorithm is forward-compatible, so that new family line formats + can be supported in the future. + +2. The canonicalizing algorithm + + To make a the family listed in a router descriptor canonical: + + For all entries of the form $hexid=name or $hexid~name, remove + the =name or ~name portion. + + Remove all entries of the form $hexid, where hexid is not 40 + hexadecimal characters long. + + If an entry is a valid nickname, put it into lower case. + + If an entry is a valid $hexid, put it into upper case. + + If there are any entries, add a single $hexid entry for the relay + in question, so that it is a member of its own family. + + Sort all entries in lexical order. + + Remove duplicate entries. + + Note that if an entry is not of the form "nickname", "$hexid", + "$hexid=nickname" or "$hexid~nickname", then it will be unchanged: + this is what makes the algorithm forward-compatible. + +3. When to apply this algorithm + + We allocate a new consensus method number. When building a consensus + using this method or later, before encoding a family entry into a + microdescriptor, the authorities should apply the algorithm above. + + Relay MAY apply this algorithm to their own families before + publishing them. Unlike authorities, relays SHOULD warn about + unrecognized family items. + + +

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[webwml/master] Add mozilla match to donate button
by hiro＠torproject.org 31 Oct '18

31 Oct '18

commit 884403dd4a2c3092d1c3b8374dfc8065f24c93df Author: hiro <hiro(a)torproject.org> Date: Wed Oct 31 15:41:16 2018 +0100 Add mozilla match to donate button --- download/en/download-easy.wml | 2 ++ download/es/download-easy.wml | 4 +++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/download/en/download-easy.wml b/download/en/download-easy.wml index bbc73fb2..8b844610 100644 --- a/download/en/download-easy.wml +++ b/download/en/download-easy.wml @@ -214,6 +214,8 @@ <div id="dow-don-right"> <a href="<page donate/donate-download>"><img src="../images/btn_donateCC_LG.gif"></a> +Mozilla will match your +donation until 12/31! </div>  diff --git a/download/es/download-easy.wml b/download/es/download-easy.wml index 44aade32..bdb1019b 100644 --- a/download/es/download-easy.wml +++ b/download/es/download-easy.wml @@ -144,6 +144,8 @@ <div id="dow-don-right"> <a href="<page donate/donate-download>"><img src="../images/btn_donateCC_LG.gif"></a> +Mozilla will match your +donation until 12/31! </div>  @@ -283,4 +285,4 @@ de descargar el Navegador Tor cuando el sitio y los mirrors están bloqueados.</ </div>  -#include <foot.wmi> \ No newline at end of file +#include <foot.wmi>

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[tor/master] Consdiff: use lengths on inputs so they don't need NUL at the end
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 5595b212270215eaa020603cabbe2c7b3b34d624 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Sep 11 09:38:20 2018 -0400 Consdiff: use lengths on inputs so they don't need NUL at the end This is part of #27244, so that we can safely mmap consensus documents. --- src/feature/dircache/consdiffmgr.c | 9 ++-- src/feature/dircache/directory.c | 10 +++- src/feature/dircommon/consdiff.c | 42 +++++++++-------- src/feature/dircommon/consdiff.h | 15 +++--- src/feature/nodelist/routerparse.c | 13 ++++-- src/feature/nodelist/routerparse.h | 4 +- src/test/bench.c | 6 ++- src/test/fuzz/fuzz_diff.c | 15 +++--- src/test/fuzz/fuzz_diff_apply.c | 13 +++--- src/test/test_consdiff.c | 94 +++++++++++++++++++++++++------------- src/test/test_consdiffmgr.c | 25 ++++++++-- 11 files changed, 156 insertions(+), 90 deletions(-) diff --git a/src/feature/dircache/consdiffmgr.c b/src/feature/dircache/consdiffmgr.c index 304b64f3b..7999df08d 100644 --- a/src/feature/dircache/consdiffmgr.c +++ b/src/feature/dircache/consdiffmgr.c @@ -1496,7 +1496,10 @@ consensus_diff_worker_threadfn(void *state_, void *work_) // XXXX ugh; this is going to calculate the SHA3 of both its // XXXX inputs again, even though we already have that. Maybe it's time // XXXX to change the API here? - consensus_diff = consensus_diff_generate(diff_from_nt, diff_to_nt); + consensus_diff = consensus_diff_generate(diff_from_nt, + strlen(diff_from_nt), + diff_to_nt, + strlen(diff_to_nt)); tor_free(diff_from_nt); tor_free(diff_to_nt); } @@ -1746,8 +1749,8 @@ consensus_compress_worker_threadfn(void *state_, void *work_) (const uint8_t *)consensus, bodylen); { const char *start, *end; - if (router_get_networkstatus_v3_signed_boundaries(consensus, - &start, &end) < 0) { + if (router_get_networkstatus_v3_signed_boundaries(consensus, bodylen, + &start, &end) < 0) { start = consensus; end = consensus+bodylen; } diff --git a/src/feature/dircache/directory.c b/src/feature/dircache/directory.c index de0bcdbfa..8e5fc8683 100644 --- a/src/feature/dircache/directory.c +++ b/src/feature/dircache/directory.c @@ -2607,12 +2607,17 @@ handle_response_fetch_consensus(dir_connection_t *conn, /* First find our previous consensus. Maybe it's in ram, maybe not. */ cached_dir_t *cd = dirserv_get_consensus(flavname); const char *consensus_body; + size_t consensus_body_len; char *owned_consensus = NULL; if (cd) { consensus_body = cd->dir; + consensus_body_len = cd->dir_len; } else { owned_consensus = networkstatus_read_cached_consensus(flavname); - consensus_body = owned_consensus; + if (owned_consensus) { + consensus_body = owned_consensus; + consensus_body_len = strlen(consensus_body); + } } if (!consensus_body) { log_warn(LD_DIR, "Received a consensus diff, but we can't find " @@ -2622,7 +2627,8 @@ handle_response_fetch_consensus(dir_connection_t *conn, return -1; } - new_consensus = consensus_diff_apply(consensus_body, body); + new_consensus = consensus_diff_apply(consensus_body, consensus_body_len, + body, body_len); tor_free(owned_consensus); if (new_consensus == NULL) { log_warn(LD_DIR, "Could not apply consensus diff received from server " diff --git a/src/feature/dircommon/consdiff.c b/src/feature/dircommon/consdiff.c index 1823dc07f..c67a11812 100644 --- a/src/feature/dircommon/consdiff.c +++ b/src/feature/dircommon/consdiff.c @@ -101,11 +101,11 @@ smartlist_add_linecpy(smartlist_t *lst, memarea_t *area, const char *s) /* This is a separate, mockable function so that we can override it when * fuzzing. */ MOCK_IMPL(STATIC int, -consensus_compute_digest,(const char *cons, +consensus_compute_digest,(const char *cons, size_t len, consensus_digest_t *digest_out)) { int r = crypto_digest256((char*)digest_out->sha3_256, - cons, strlen(cons), DIGEST_SHA3_256); + cons, len, DIGEST_SHA3_256); return r; } @@ -114,11 +114,11 @@ consensus_compute_digest,(const char *cons, /* This is a separate, mockable function so that we can override it when * fuzzing. */ MOCK_IMPL(STATIC int, -consensus_compute_digest_as_signed,(const char *cons, +consensus_compute_digest_as_signed,(const char *cons, size_t len, consensus_digest_t *digest_out)) { return router_get_networkstatus_v3_sha3_as_signed(digest_out->sha3_256, - cons); + cons, len); } /** Return true iff d1 and d2 contain the same digest */ @@ -1229,7 +1229,8 @@ consdiff_apply_diff(const smartlist_t *cons1, cons2_str = consensus_join_lines(cons2); consensus_digest_t cons2_digests; - if (consensus_compute_digest(cons2_str, &cons2_digests) < 0) { + if (consensus_compute_digest(cons2_str, strlen(cons2_str), + &cons2_digests) < 0) { /* LCOV_EXCL_START -- digest can't fail */ log_warn(LD_CONSDIFF, "Could not compute digests of the consensus " "resulting from applying a consensus diff."); @@ -1283,12 +1284,13 @@ consdiff_apply_diff(const smartlist_t *cons1, * generated cdlines will become invalid. */ STATIC int -consensus_split_lines(smartlist_t *out, const char *s, memarea_t *area) +consensus_split_lines(smartlist_t *out, + const char *s, size_t len, + memarea_t *area) { - const char *end_of_str = s + strlen(s); - tor_assert(*end_of_str == '\0'); + const char *end_of_str = s + len; - while (*s) { + while (s < end_of_str) { const char *eol = memchr(s, '\n', end_of_str - s); if (!eol) { /* File doesn't end with newline. */ @@ -1334,25 +1336,25 @@ consensus_join_lines(const smartlist_t *inp) * success, retun a newly allocated string containing that diff. On failure, * return NULL. */ char * -consensus_diff_generate(const char *cons1, - const char *cons2) +consensus_diff_generate(const char *cons1, size_t cons1len, + const char *cons2, size_t cons2len) { consensus_digest_t d1, d2; smartlist_t *lines1 = NULL, *lines2 = NULL, *result_lines = NULL; int r1, r2; char *result = NULL; - r1 = consensus_compute_digest_as_signed(cons1, &d1); - r2 = consensus_compute_digest(cons2, &d2); + r1 = consensus_compute_digest_as_signed(cons1, cons1len, &d1); + r2 = consensus_compute_digest(cons2, cons2len, &d2); if (BUG(r1 < 0 || r2 < 0)) return NULL; // LCOV_EXCL_LINE memarea_t *area = memarea_new(); lines1 = smartlist_new(); lines2 = smartlist_new(); - if (consensus_split_lines(lines1, cons1, area) < 0) + if (consensus_split_lines(lines1, cons1, cons1len, area) < 0) goto done; - if (consensus_split_lines(lines2, cons2, area) < 0) + if (consensus_split_lines(lines2, cons2, cons2len, area) < 0) goto done; result_lines = consdiff_gen_diff(lines1, lines2, &d1, &d2, area); @@ -1375,7 +1377,9 @@ consensus_diff_generate(const char *cons1, * consensus. On failure, return NULL. */ char * consensus_diff_apply(const char *consensus, - const char *diff) + size_t consensus_len, + const char *diff, + size_t diff_len) { consensus_digest_t d1; smartlist_t *lines1 = NULL, *lines2 = NULL; @@ -1383,15 +1387,15 @@ consensus_diff_apply(const char *consensus, char *result = NULL; memarea_t *area = memarea_new(); - r1 = consensus_compute_digest_as_signed(consensus, &d1); + r1 = consensus_compute_digest_as_signed(consensus, consensus_len, &d1); if (BUG(r1 < 0)) return NULL; // LCOV_EXCL_LINE lines1 = smartlist_new(); lines2 = smartlist_new(); - if (consensus_split_lines(lines1, consensus, area) < 0) + if (consensus_split_lines(lines1, consensus, consensus_len, area) < 0) goto done; - if (consensus_split_lines(lines2, diff, area) < 0) + if (consensus_split_lines(lines2, diff, diff_len, area) < 0) goto done; result = consdiff_apply_diff(lines1, lines2, &d1); diff --git a/src/feature/dircommon/consdiff.h b/src/feature/dircommon/consdiff.h index a5e4ba5cb..eb7c9f9fe 100644 --- a/src/feature/dircommon/consdiff.h +++ b/src/feature/dircommon/consdiff.h @@ -7,10 +7,10 @@ #include "core/or/or.h" -char *consensus_diff_generate(const char *cons1, - const char *cons2); -char *consensus_diff_apply(const char *consensus, - const char *diff); +char *consensus_diff_generate(const char *cons1, size_t cons1len, + const char *cons2, size_t cons2len); +char *consensus_diff_apply(const char *consensus, size_t consensus_len, + const char *diff, size_t diff_len); int looks_like_a_consensus_diff(const char *document, size_t len); @@ -78,7 +78,8 @@ STATIC int smartlist_slice_string_pos(const smartlist_slice_t *slice, STATIC void set_changed(bitarray_t *changed1, bitarray_t *changed2, const smartlist_slice_t *slice1, const smartlist_slice_t *slice2); -STATIC int consensus_split_lines(smartlist_t *out, const char *s, +STATIC int consensus_split_lines(smartlist_t *out, + const char *s, size_t len, struct memarea_t *area); STATIC void smartlist_add_linecpy(smartlist_t *lst, struct memarea_t *area, const char *s); @@ -86,10 +87,10 @@ STATIC int lines_eq(const cdline_t *a, const cdline_t *b); STATIC int line_str_eq(const cdline_t *a, const char *b); MOCK_DECL(STATIC int, - consensus_compute_digest,(const char *cons, + consensus_compute_digest,(const char *cons, size_t len, consensus_digest_t *digest_out)); MOCK_DECL(STATIC int, - consensus_compute_digest_as_signed,(const char *cons, + consensus_compute_digest_as_signed,(const char *cons, size_t len, consensus_digest_t *digest_out)); MOCK_DECL(STATIC int, consensus_digest_eq,(const uint8_t *d1, diff --git a/src/feature/nodelist/routerparse.c b/src/feature/nodelist/routerparse.c index 73d320de4..9c51799d9 100644 --- a/src/feature/nodelist/routerparse.c +++ b/src/feature/nodelist/routerparse.c @@ -1024,10 +1024,11 @@ router_get_router_hash(const char *s, size_t s_len, char *digest) * -1. */ int router_get_networkstatus_v3_signed_boundaries(const char *s, + size_t len, const char **start_out, const char **end_out) { - return router_get_hash_impl_helper(s, strlen(s), + return router_get_hash_impl_helper(s, len, "network-status-version", "\ndirectory-signature", ' ', LOG_INFO, @@ -1039,12 +1040,13 @@ router_get_networkstatus_v3_signed_boundaries(const char *s, * signed portion can be identified. Return 0 on success, -1 on failure. */ int router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, - const char *s) + const char *s, size_t len) { const char *start, *end; - if (router_get_networkstatus_v3_signed_boundaries(s, &start, &end) < 0) { + if (router_get_networkstatus_v3_signed_boundaries(s, len, + &start, &end) < 0) { start = s; - end = s + strlen(s); + end = s + len; } tor_assert(start); tor_assert(end); @@ -3415,7 +3417,8 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, *eos_out = NULL; if (router_get_networkstatus_v3_hashes(s, &ns_digests) || - router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, s)<0) { + router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, + s, strlen(s))<0) { log_warn(LD_DIR, "Unable to compute digest of network-status"); goto err; } diff --git a/src/feature/nodelist/routerparse.h b/src/feature/nodelist/routerparse.h index 87c2a75aa..be455984d 100644 --- a/src/feature/nodelist/routerparse.h +++ b/src/feature/nodelist/routerparse.h @@ -32,11 +32,11 @@ int router_get_router_hash(const char *s, size_t s_len, char *digest); int router_get_dir_hash(const char *s, char *digest); int router_get_networkstatus_v3_hashes(const char *s, common_digests_t *digests); -int router_get_networkstatus_v3_signed_boundaries(const char *s, +int router_get_networkstatus_v3_signed_boundaries(const char *s, size_t len, const char **start_out, const char **end_out); int router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, - const char *s); + const char *s, size_t len); int router_get_extrainfo_hash(const char *s, size_t s_len, char *digest); #define DIROBJ_MAX_SIG_LEN 256 char *router_get_dirobj_signature(const char *digest, diff --git a/src/test/bench.c b/src/test/bench.c index 959d4374b..9da1b46a1 100644 --- a/src/test/bench.c +++ b/src/test/bench.c @@ -702,11 +702,13 @@ main(int argc, const char **argv) perror("X"); return 1; } + size_t f1len = strlen(f1); + size_t f2len = strlen(f2); for (i = 0; i < N; ++i) { - char *diff = consensus_diff_generate(f1, f2); + char *diff = consensus_diff_generate(f1, f1len, f2, f2len); tor_free(diff); } - char *diff = consensus_diff_generate(f1, f2); + char *diff = consensus_diff_generate(f1, f1len, f2, f2len); printf("%s", diff); tor_free(f1); tor_free(f2); diff --git a/src/test/fuzz/fuzz_diff.c b/src/test/fuzz/fuzz_diff.c index 1079856fd..8966856be 100644 --- a/src/test/fuzz/fuzz_diff.c +++ b/src/test/fuzz/fuzz_diff.c @@ -10,9 +10,11 @@ #include "test/fuzz/fuzzing.h" static int -mock_consensus_compute_digest_(const char *c, consensus_digest_t *d) +mock_consensus_compute_digest_(const char *c, size_t len, + consensus_digest_t *d) { (void)c; + (void)len; memset(d->sha3_256, 3, sizeof(d->sha3_256)); return 0; } @@ -42,14 +44,14 @@ fuzz_main(const uint8_t *stdin_buf, size_t data_size) if (! separator) return 0; size_t c1_len = separator - stdin_buf; - char *c1 = tor_memdup_nulterm(stdin_buf, c1_len); + const char *c1 = (const char *)stdin_buf; size_t c2_len = data_size - c1_len - SEPLEN; - char *c2 = tor_memdup_nulterm(separator + SEPLEN, c2_len); + const char *c2 = (const char *)separator + SEPLEN; - char *c3 = consensus_diff_generate(c1, c2); + char *c3 = consensus_diff_generate(c1, c1_len, c2, c2_len); if (c3) { - char *c4 = consensus_diff_apply(c1, c3); + char *c4 = consensus_diff_apply(c1, c1_len, c3, strlen(c3)); tor_assert(c4); if (strcmp(c2, c4)) { printf("%s\n", escaped(c1)); @@ -61,9 +63,6 @@ fuzz_main(const uint8_t *stdin_buf, size_t data_size) tor_free(c3); tor_free(c4); } - tor_free(c1); - tor_free(c2); return 0; } - diff --git a/src/test/fuzz/fuzz_diff_apply.c b/src/test/fuzz/fuzz_diff_apply.c index 165d0e612..9b2518522 100644 --- a/src/test/fuzz/fuzz_diff_apply.c +++ b/src/test/fuzz/fuzz_diff_apply.c @@ -10,9 +10,11 @@ #include "test/fuzz/fuzzing.h" static int -mock_consensus_compute_digest_(const char *c, consensus_digest_t *d) +mock_consensus_compute_digest_(const char *c, size_t len, + consensus_digest_t *d) { (void)c; + (void)len; memset(d->sha3_256, 3, sizeof(d->sha3_256)); return 0; } @@ -50,16 +52,13 @@ fuzz_main(const uint8_t *stdin_buf, size_t data_size) if (! separator) return 0; size_t c1_len = separator - stdin_buf; - char *c1 = tor_memdup_nulterm(stdin_buf, c1_len); + const char *c1 = (const char *)stdin_buf; size_t c2_len = data_size - c1_len - SEPLEN; - char *c2 = tor_memdup_nulterm(separator + SEPLEN, c2_len); + const char *c2 = (const char *)separator + SEPLEN; - char *c3 = consensus_diff_apply(c1, c2); + char *c3 = consensus_diff_apply(c1, c1_len, c2, c2_len); - tor_free(c1); - tor_free(c2); tor_free(c3); return 0; } - diff --git a/src/test/test_consdiff.c b/src/test/test_consdiff.c index b836befd2..23e8f7167 100644 --- a/src/test/test_consdiff.c +++ b/src/test/test_consdiff.c @@ -14,6 +14,39 @@ #define tt_str_eq_line(a,b) \ tt_assert(line_str_eq((b),(a))) +static int +consensus_split_lines_(smartlist_t *out, const char *s, memarea_t *area) +{ + size_t len = strlen(s); + return consensus_split_lines(out, s, len, area); +} + +static int +consensus_compute_digest_(const char *cons, + consensus_digest_t *digest_out) +{ + size_t len = strlen(cons); + char *tmp = tor_memdup(cons, len); + // We use memdup here to ensure that the input is NOT nul-terminated. + // This makes it likelier for us to spot bugs. + int r = consensus_compute_digest(tmp, len, digest_out); + tor_free(tmp); + return r; +} + +static int +consensus_compute_digest_as_signed_(const char *cons, + consensus_digest_t *digest_out) +{ + size_t len = strlen(cons); + char *tmp = tor_memdup(cons, len); + // We use memdup here to ensure that the input is NOT nul-terminated. + // This makes it likelier for us to spot bugs. + int r = consensus_compute_digest_as_signed(tmp, len, digest_out); + tor_free(tmp); + return r; +} + static void test_consdiff_smartlist_slice(void *arg) { @@ -58,7 +91,7 @@ test_consdiff_smartlist_slice_string_pos(void *arg) /* Create a regular smartlist. */ (void)arg; - consensus_split_lines(sl, "a\nd\nc\na\nb\n", area); + consensus_split_lines_(sl, "a\nd\nc\na\nb\n", area); /* See that smartlist_slice_string_pos respects the bounds of the slice. */ sls = smartlist_slice(sl, 2, 5); @@ -87,8 +120,8 @@ test_consdiff_lcs_lengths(void *arg) int e_lengths2[] = { 0, 1, 1, 2, 3, 4 }; (void)arg; - consensus_split_lines(sl1, "a\nb\nc\nd\ne\n", area); - consensus_split_lines(sl2, "a\nc\nd\ni\ne\n", area); + consensus_split_lines_(sl1, "a\nb\nc\nd\ne\n", area); + consensus_split_lines_(sl2, "a\nc\nd\ni\ne\n", area); sls1 = smartlist_slice(sl1, 0, -1); sls2 = smartlist_slice(sl2, 0, -1); @@ -119,10 +152,10 @@ test_consdiff_trim_slices(void *arg) memarea_t *area = memarea_new(); (void)arg; - consensus_split_lines(sl1, "a\nb\nb\nb\nd\n", area); - consensus_split_lines(sl2, "a\nc\nc\nc\nd\n", area); - consensus_split_lines(sl3, "a\nb\nb\nb\na\n", area); - consensus_split_lines(sl4, "c\nb\nb\nb\nc\n", area); + consensus_split_lines_(sl1, "a\nb\nb\nb\nd\n", area); + consensus_split_lines_(sl2, "a\nc\nc\nc\nd\n", area); + consensus_split_lines_(sl3, "a\nb\nb\nb\na\n", area); + consensus_split_lines_(sl4, "c\nb\nb\nb\nc\n", area); sls1 = smartlist_slice(sl1, 0, -1); sls2 = smartlist_slice(sl2, 0, -1); sls3 = smartlist_slice(sl3, 0, -1); @@ -165,8 +198,8 @@ test_consdiff_set_changed(void *arg) memarea_t *area = memarea_new(); (void)arg; - consensus_split_lines(sl1, "a\nb\na\na\n", area); - consensus_split_lines(sl2, "a\na\na\na\n", area); + consensus_split_lines_(sl1, "a\nb\na\na\n", area); + consensus_split_lines_(sl2, "a\na\na\na\n", area); /* Length of sls1 is 0. */ sls1 = smartlist_slice(sl1, 0, 0); @@ -240,8 +273,8 @@ test_consdiff_calc_changes(void *arg) memarea_t *area = memarea_new(); (void)arg; - consensus_split_lines(sl1, "a\na\na\na\n", area); - consensus_split_lines(sl2, "a\na\na\na\n", area); + consensus_split_lines_(sl1, "a\na\na\na\n", area); + consensus_split_lines_(sl2, "a\na\na\na\n", area); sls1 = smartlist_slice(sl1, 0, -1); sls2 = smartlist_slice(sl2, 0, -1); @@ -259,7 +292,7 @@ test_consdiff_calc_changes(void *arg) tt_assert(!bitarray_is_set(changed2, 3)); smartlist_clear(sl2); - consensus_split_lines(sl2, "a\nb\na\nb\n", area); + consensus_split_lines_(sl2, "a\nb\na\nb\n", area); tor_free(sls1); tor_free(sls2); sls1 = smartlist_slice(sl1, 0, -1); @@ -282,7 +315,7 @@ test_consdiff_calc_changes(void *arg) bitarray_clear(changed1, 3); smartlist_clear(sl2); - consensus_split_lines(sl2, "b\nb\nb\nb\n", area); + consensus_split_lines_(sl2, "b\nb\nb\nb\n", area); tor_free(sls1); tor_free(sls2); sls1 = smartlist_slice(sl1, 0, -1); @@ -610,8 +643,8 @@ test_consdiff_gen_ed_diff(void *arg) /* Test 'a', 'c' and 'd' together. See that it is done in reverse order. */ smartlist_clear(cons1); smartlist_clear(cons2); - consensus_split_lines(cons1, "A\nB\nC\nD\nE\n", area); - consensus_split_lines(cons2, "A\nC\nO\nE\nU\n", area); + consensus_split_lines_(cons1, "A\nB\nC\nD\nE\n", area); + consensus_split_lines_(cons2, "A\nC\nO\nE\nU\n", area); diff = gen_ed_diff(cons1, cons2, area); tt_ptr_op(NULL, OP_NE, diff); tt_int_op(7, OP_EQ, smartlist_len(diff)); @@ -627,8 +660,8 @@ test_consdiff_gen_ed_diff(void *arg) smartlist_clear(cons1); smartlist_clear(cons2); - consensus_split_lines(cons1, "B\n", area); - consensus_split_lines(cons2, "A\nB\n", area); + consensus_split_lines_(cons1, "B\n", area); + consensus_split_lines_(cons2, "A\nB\n", area); diff = gen_ed_diff(cons1, cons2, area); tt_ptr_op(NULL, OP_NE, diff); tt_int_op(3, OP_EQ, smartlist_len(diff)); @@ -656,7 +689,7 @@ test_consdiff_apply_ed_diff(void *arg) diff = smartlist_new(); setup_capture_of_logs(LOG_WARN); - consensus_split_lines(cons1, "A\nB\nC\nD\nE\n", area); + consensus_split_lines_(cons1, "A\nB\nC\nD\nE\n", area); /* Command without range. */ smartlist_add_linecpy(diff, area, "a"); @@ -829,7 +862,7 @@ test_consdiff_apply_ed_diff(void *arg) smartlist_clear(diff); /* Test appending text, 'a'. */ - consensus_split_lines(diff, "3a\nU\nO\n.\n0a\nV\n.\n", area); + consensus_split_lines_(diff, "3a\nU\nO\n.\n0a\nV\n.\n", area); cons2 = apply_ed_diff(cons1, diff, 0); tt_ptr_op(NULL, OP_NE, cons2); tt_int_op(8, OP_EQ, smartlist_len(cons2)); @@ -846,7 +879,7 @@ test_consdiff_apply_ed_diff(void *arg) smartlist_free(cons2); /* Test deleting text, 'd'. */ - consensus_split_lines(diff, "4d\n1,2d\n", area); + consensus_split_lines_(diff, "4d\n1,2d\n", area); cons2 = apply_ed_diff(cons1, diff, 0); tt_ptr_op(NULL, OP_NE, cons2); tt_int_op(2, OP_EQ, smartlist_len(cons2)); @@ -857,7 +890,7 @@ test_consdiff_apply_ed_diff(void *arg) smartlist_free(cons2); /* Test changing text, 'c'. */ - consensus_split_lines(diff, "4c\nT\nX\n.\n1,2c\nM\n.\n", area); + consensus_split_lines_(diff, "4c\nT\nX\n.\n1,2c\nM\n.\n", area); cons2 = apply_ed_diff(cons1, diff, 0); tt_ptr_op(NULL, OP_NE, cons2); tt_int_op(5, OP_EQ, smartlist_len(cons2)); @@ -871,7 +904,7 @@ test_consdiff_apply_ed_diff(void *arg) smartlist_free(cons2); /* Test 'a', 'd' and 'c' together. */ - consensus_split_lines(diff, "4c\nT\nX\n.\n2d\n0a\nM\n.\n", area); + consensus_split_lines_(diff, "4c\nT\nX\n.\n2d\n0a\nM\n.\n", area); cons2 = apply_ed_diff(cons1, diff, 0); tt_ptr_op(NULL, OP_NE, cons2); tt_int_op(6, OP_EQ, smartlist_len(cons2)); @@ -918,12 +951,12 @@ test_consdiff_gen_diff(void *arg) ); tt_int_op(0, OP_EQ, - consensus_compute_digest_as_signed(cons1_str, &digests1)); + consensus_compute_digest_as_signed_(cons1_str, &digests1)); tt_int_op(0, OP_EQ, - consensus_compute_digest(cons2_str, &digests2)); + consensus_compute_digest_(cons2_str, &digests2)); - consensus_split_lines(cons1, cons1_str, area); - consensus_split_lines(cons2, cons2_str, area); + consensus_split_lines_(cons1, cons1_str, area); + consensus_split_lines_(cons2, cons2_str, area); diff = consdiff_gen_diff(cons1, cons2, &digests1, &digests2, area); tt_ptr_op(NULL, OP_EQ, diff); @@ -937,9 +970,9 @@ test_consdiff_gen_diff(void *arg) "directory-signature foo bar\nbar\n" ); tt_int_op(0, OP_EQ, - consensus_compute_digest_as_signed(cons1_str, &digests1)); + consensus_compute_digest_as_signed_(cons1_str, &digests1)); smartlist_clear(cons1); - consensus_split_lines(cons1, cons1_str, area); + consensus_split_lines_(cons1, cons1_str, area); diff = consdiff_gen_diff(cons1, cons2, &digests1, &digests2, area); tt_ptr_op(NULL, OP_NE, diff); tt_int_op(11, OP_EQ, smartlist_len(diff)); @@ -991,8 +1024,8 @@ test_consdiff_apply_diff(void *arg) "directory-signature foo bar\nbar\n" ); tt_int_op(0, OP_EQ, - consensus_compute_digest(cons1_str, &digests1)); - consensus_split_lines(cons1, cons1_str, area); + consensus_compute_digest_(cons1_str, &digests1)); + consensus_split_lines_(cons1, cons1_str, area); /* diff doesn't have enough lines. */ cons2 = consdiff_apply_diff(cons1, diff, &digests1); @@ -1182,4 +1215,3 @@ struct testcase_t consdiff_tests[] = { CONSDIFF_LEGACY(apply_diff), END_OF_TESTCASES }; - diff --git a/src/test/test_consdiffmgr.c b/src/test/test_consdiffmgr.c index 6c0601b50..dc4fea7f6 100644 --- a/src/test/test_consdiffmgr.c +++ b/src/test/test_consdiffmgr.c @@ -21,6 +21,21 @@ #include "test/test.h" #include "test/log_test_helpers.h" +static char * +consensus_diff_apply_(const char *c, const char *d) +{ + size_t c_len = strlen(c); + size_t d_len = strlen(d); + // We use memdup here to ensure that the input is NOT nul-terminated. + // This makes it likelier for us to spot bugs. + char *c_tmp = tor_memdup(c, c_len); + char *d_tmp = tor_memdup(d, d_len); + char *result = consensus_diff_apply(c_tmp, c_len, d_tmp, d_len); + tor_free(c_tmp); + tor_free(d_tmp); + return result; +} + // ============================== Setup/teardown the consdiffmgr // These functions get run before/after each test in this module @@ -153,7 +168,8 @@ lookup_diff_from(consensus_cache_entry_t **out, const char *str1) { uint8_t digest[DIGEST256_LEN]; - if (router_get_networkstatus_v3_sha3_as_signed(digest, str1)<0) { + if (router_get_networkstatus_v3_sha3_as_signed(digest, + str1, strlen(str1))<0) { TT_FAIL(("Unable to compute sha3-as-signed")); return CONSDIFF_NOT_FOUND; } @@ -181,7 +197,7 @@ lookup_apply_and_verify_diff(consensus_flavor_t flav, if (diff_string == NULL || r < 0) return -1; - char *applied = consensus_diff_apply(str1, diff_string); + char *applied = consensus_diff_apply_(str1, diff_string); tor_free(diff_string); if (applied == NULL) return -1; @@ -370,7 +386,8 @@ test_consdiffmgr_make_diffs(void *arg) ns = fake_ns_new(FLAV_MICRODESC, now-3600); md_ns_body = fake_ns_body_new(FLAV_MICRODESC, now-3600); r = consdiffmgr_add_consensus(md_ns_body, ns); - router_get_networkstatus_v3_sha3_as_signed(md_ns_sha3, md_ns_body); + router_get_networkstatus_v3_sha3_as_signed(md_ns_sha3, md_ns_body, + strlen(md_ns_body)); networkstatus_vote_free(ns); tt_int_op(r, OP_EQ, 0); @@ -414,7 +431,7 @@ test_consdiffmgr_make_diffs(void *arg) r = consensus_cache_entry_get_body(diff, &diff_body, &diff_size); tt_int_op(r, OP_EQ, 0); diff_text = tor_memdup_nulterm(diff_body, diff_size); - applied = consensus_diff_apply(md_ns_body, diff_text); + applied = consensus_diff_apply_(md_ns_body, diff_text); tt_assert(applied); tt_str_op(applied, OP_EQ, md_ns_body_2);

1 0

[tor/master] Stop memcpy'ing uncompressed consensuses when making diffs
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit e014b72b73b2a299068f1ca5b7a22f2bea2f58f8 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Sep 11 10:09:12 2018 -0400 Stop memcpy'ing uncompressed consensuses when making diffs --- src/feature/dircache/consdiffmgr.c | 50 +++++++++++++++++++++++--------------- src/feature/dircache/consdiffmgr.h | 5 ++-- src/test/fuzz/fuzz_diff.c | 17 ++++++++++--- src/test/test_consdiffmgr.c | 16 ++++++------ 4 files changed, 56 insertions(+), 32 deletions(-) diff --git a/src/feature/dircache/consdiffmgr.c b/src/feature/dircache/consdiffmgr.c index 7999df08d..bf3a0ef3c 100644 --- a/src/feature/dircache/consdiffmgr.c +++ b/src/feature/dircache/consdiffmgr.c @@ -1387,19 +1387,21 @@ typedef struct consensus_diff_worker_job_t { } consensus_diff_worker_job_t; /** Given a consensus_cache_entry_t, check whether it has a label claiming - * that it was compressed. If so, uncompress its contents into out and - * set outlen to hold their size. If not, just copy the body into - * out and set outlen to its length. Return 0 on success, - * -1 on failure. - * - * In all cases, the output is nul-terminated. */ + * that it was compressed. If so, uncompress its contents into *out and + * set outlen to hold their size, and set *owned_out to a pointer + * that the caller will need to free. If not, just set *out and + * outlen to its extent in memory. Return 0 on success, -1 on failure. + **/ STATIC int -uncompress_or_copy(char **out, size_t *outlen, - consensus_cache_entry_t *ent) +uncompress_or_set_ptr(const char **out, size_t *outlen, + char **owned_out, + consensus_cache_entry_t *ent) { const uint8_t *body; size_t bodylen; + *owned_out = NULL; + if (consensus_cache_entry_get_body(ent, &body, &bodylen) < 0) return -1; @@ -1410,8 +1412,17 @@ uncompress_or_copy(char **out, size_t *outlen, if (lv_compression) method = compression_method_get_by_name(lv_compression); - return tor_uncompress(out, outlen, (const char *)body, bodylen, + int rv; + if (method == NO_METHOD) { + *out = (const char *)body; + *outlen = bodylen; + rv = 0; + } else { + rv = tor_uncompress(owned_out, outlen, (const char *)body, bodylen, method, 1, LOG_WARN); + *out = *owned_out; + } + return rv; } /** @@ -1478,16 +1489,17 @@ consensus_diff_worker_threadfn(void *state_, void *work_) char *consensus_diff; { - char *diff_from_nt = NULL, *diff_to_nt = NULL; + const char *diff_from_nt = NULL, *diff_to_nt = NULL; + char *owned1 = NULL, *owned2 = NULL; size_t diff_from_nt_len, diff_to_nt_len; - if (uncompress_or_copy(&diff_from_nt, &diff_from_nt_len, - job->diff_from) < 0) { + if (uncompress_or_set_ptr(&diff_from_nt, &diff_from_nt_len, &owned1, + job->diff_from) < 0) { return WQ_RPL_REPLY; } - if (uncompress_or_copy(&diff_to_nt, &diff_to_nt_len, - job->diff_to) < 0) { - tor_free(diff_from_nt); + if (uncompress_or_set_ptr(&diff_to_nt, &diff_to_nt_len, &owned2, + job->diff_to) < 0) { + tor_free(owned1); return WQ_RPL_REPLY; } tor_assert(diff_from_nt); @@ -1497,11 +1509,11 @@ consensus_diff_worker_threadfn(void *state_, void *work_) // XXXX inputs again, even though we already have that. Maybe it's time // XXXX to change the API here? consensus_diff = consensus_diff_generate(diff_from_nt, - strlen(diff_from_nt), + diff_from_nt_len, diff_to_nt, - strlen(diff_to_nt)); - tor_free(diff_from_nt); - tor_free(diff_to_nt); + diff_to_nt_len); + tor_free(owned1); + tor_free(owned2); } if (!consensus_diff) { /* Couldn't generate consensus; we'll leave the reply blank. */ diff --git a/src/feature/dircache/consdiffmgr.h b/src/feature/dircache/consdiffmgr.h index 66c3d6500..d6f273cc4 100644 --- a/src/feature/dircache/consdiffmgr.h +++ b/src/feature/dircache/consdiffmgr.h @@ -68,8 +68,9 @@ STATIC consensus_cache_entry_t *cdm_cache_lookup_consensus( STATIC int cdm_entry_get_sha3_value(uint8_t *digest_out, consensus_cache_entry_t *ent, const char *label); -STATIC int uncompress_or_copy(char **out, size_t *outlen, - consensus_cache_entry_t *ent); +STATIC int uncompress_or_set_ptr(const char **out, size_t *outlen, + char **owned_out, + consensus_cache_entry_t *ent); #endif /* defined(CONSDIFFMGR_PRIVATE) */ #endif /* !defined(TOR_CONSDIFFMGR_H) */ diff --git a/src/test/fuzz/fuzz_diff.c b/src/test/fuzz/fuzz_diff.c index 8966856be..64aecc8a6 100644 --- a/src/test/fuzz/fuzz_diff.c +++ b/src/test/fuzz/fuzz_diff.c @@ -48,18 +48,27 @@ fuzz_main(const uint8_t *stdin_buf, size_t data_size) size_t c2_len = data_size - c1_len - SEPLEN; const char *c2 = (const char *)separator + SEPLEN; + const char *cp = memchr(c1, 0, c1_len); + if (cp) + c1_len = cp - c1; + + cp = memchr(c2, 0, c2_len); + if (cp) + c2_len = cp - c2; + char *c3 = consensus_diff_generate(c1, c1_len, c2, c2_len); if (c3) { char *c4 = consensus_diff_apply(c1, c1_len, c3, strlen(c3)); tor_assert(c4); - if (strcmp(c2, c4)) { - printf("%s\n", escaped(c1)); - printf("%s\n", escaped(c2)); + int equal = (c2_len == strlen(c4)) && fast_memeq(c2, c4, c2_len); + if (! equal) { + //printf("%s\n", escaped(c1)); + //printf("%s\n", escaped(c2)); printf("%s\n", escaped(c3)); printf("%s\n", escaped(c4)); } - tor_assert(! strcmp(c2, c4)); + tor_assert(equal); tor_free(c3); tor_free(c4); } diff --git a/src/test/test_consdiffmgr.c b/src/test/test_consdiffmgr.c index dc4fea7f6..4b49fdb6a 100644 --- a/src/test/test_consdiffmgr.c +++ b/src/test/test_consdiffmgr.c @@ -191,14 +191,15 @@ lookup_apply_and_verify_diff(consensus_flavor_t flav, consensus_cache_entry_incref(ent); size_t size; - char *diff_string = NULL; - int r = uncompress_or_copy(&diff_string, &size, ent); + const char *diff_string = NULL; + char *diff_owned = NULL; + int r = uncompress_or_set_ptr(&diff_string, &size, &diff_owned, ent); consensus_cache_entry_decref(ent); if (diff_string == NULL || r < 0) return -1; - char *applied = consensus_diff_apply_(str1, diff_string); - tor_free(diff_string); + char *applied = consensus_diff_apply(str1, strlen(str1), diff_string, size); + tor_free(diff_owned); if (applied == NULL) return -1; @@ -298,7 +299,8 @@ test_consdiffmgr_add(void *arg) (void) arg; time_t now = approx_time(); - char *body = NULL; + const char *body = NULL; + char *body_owned = NULL; consensus_cache_entry_t *ent = NULL; networkstatus_t *ns_tmp = fake_ns_new(FLAV_NS, now); @@ -340,7 +342,7 @@ test_consdiffmgr_add(void *arg) tt_assert(ent); consensus_cache_entry_incref(ent); size_t s; - r = uncompress_or_copy(&body, &s, ent); + r = uncompress_or_set_ptr(&body, &s, &body_owned, ent); tt_int_op(r, OP_EQ, 0); tt_int_op(s, OP_EQ, 4); tt_mem_op(body, OP_EQ, "quux", 4); @@ -353,7 +355,7 @@ test_consdiffmgr_add(void *arg) networkstatus_vote_free(ns_tmp); teardown_capture_of_logs(); consensus_cache_entry_decref(ent); - tor_free(body); + tor_free(body_owned); } static void

1 0

[tor/master] Followup: Make authority_cert_parse_from_string() take length too
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 04bb70199be924804708bd4ace18b28b5acdbf19 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Sep 11 11:37:55 2018 -0400 Followup: Make authority_cert_parse_from_string() take length too --- src/feature/nodelist/routerlist.c | 3 ++- src/feature/nodelist/routerparse.c | 19 +++++++++++-------- src/feature/nodelist/routerparse.h | 1 + src/feature/relay/router.c | 2 +- src/test/test_dir.c | 12 +++++++++--- src/test/test_dir_common.c | 12 +++++++++--- src/test/test_dir_handle_get.c | 16 ++++++++++++---- src/test/test_routerlist.c | 12 +++++++++--- src/test/test_shared_random.c | 12 +++++++++--- 9 files changed, 63 insertions(+), 26 deletions(-) diff --git a/src/feature/nodelist/routerlist.c b/src/feature/nodelist/routerlist.c index bcc5c1f07..c3c72e9c7 100644 --- a/src/feature/nodelist/routerlist.c +++ b/src/feature/nodelist/routerlist.c @@ -555,7 +555,8 @@ trusted_dirs_load_certs_from_string(const char *contents, int source, int added_trusted_cert = 0; for (s = contents; *s; s = eos) { - authority_cert_t *cert = authority_cert_parse_from_string(s, &eos); + authority_cert_t *cert = authority_cert_parse_from_string(s, strlen(s), + &eos); cert_list_t *cl; if (!cert) { failure_code = -1; diff --git a/src/feature/nodelist/routerparse.c b/src/feature/nodelist/routerparse.c index 9abdfb614..8a5efc007 100644 --- a/src/feature/nodelist/routerparse.c +++ b/src/feature/nodelist/routerparse.c @@ -2308,7 +2308,8 @@ extrainfo_parse_entry_from_string(const char *s, const char *end, /** Parse a key certificate from s; point end-of-string to * the first character after the certificate. */ authority_cert_t * -authority_cert_parse_from_string(const char *s, const char **end_of_string) +authority_cert_parse_from_string(const char *s, size_t maxlen, + const char **end_of_string) { /** Reject any certificate at least this big; it is probably an overflow, an * attack, a bug, or some other nonsense. */ @@ -2319,24 +2320,25 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string) char digest[DIGEST_LEN]; directory_token_t *tok; char fp_declared[DIGEST_LEN]; - char *eos; + const char *eos; size_t len; int found; memarea_t *area = NULL; + const char *end_of_s = s + maxlen; const char *s_dup = s; - s = eat_whitespace(s); - eos = strstr(s, "\ndir-key-certification"); + s = eat_whitespace_eos(s, end_of_s); + eos = tor_memstr(s, end_of_s - s, "\ndir-key-certification"); if (! eos) { log_warn(LD_DIR, "No signature found on key certificate"); return NULL; } - eos = strstr(eos, "\n-----END SIGNATURE-----\n"); + eos = tor_memstr(eos, end_of_s - eos, "\n-----END SIGNATURE-----\n"); if (! eos) { log_warn(LD_DIR, "No end-of-signature found on key certificate"); return NULL; } - eos = strchr(eos+2, '\n'); + eos = memchr(eos+2, '\n', end_of_s - (eos+2)); tor_assert(eos); ++eos; len = eos - s; @@ -2353,7 +2355,7 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string) log_warn(LD_DIR, "Error tokenizing key certificate"); goto err; } - if (router_get_hash_impl(s, strlen(s), digest, "dir-key-certificate-version", + if (router_get_hash_impl(s, eos-s, digest, "dir-key-certificate-version", "\ndir-key-certification", '\n', DIGEST_SHA1) < 0) goto err; tok = smartlist_get(tokens, 0); @@ -3465,7 +3467,8 @@ networkstatus_parse_vote_from_string(const char *s, "\ndir-key-certificate-version"))) goto err; ++cert; - ns->cert = authority_cert_parse_from_string(cert, &end_of_cert); + ns->cert = authority_cert_parse_from_string(cert, end_of_header - cert, + &end_of_cert); if (!ns->cert || !end_of_cert || end_of_cert > end_of_header) goto err; } diff --git a/src/feature/nodelist/routerparse.h b/src/feature/nodelist/routerparse.h index 390088c94..c60046e8e 100644 --- a/src/feature/nodelist/routerparse.h +++ b/src/feature/nodelist/routerparse.h @@ -93,6 +93,7 @@ smartlist_t *microdescs_parse_from_string(const char *s, const char *eos, smartlist_t *invalid_digests_out); authority_cert_t *authority_cert_parse_from_string(const char *s, + size_t maxlen, const char **end_of_string); int rend_parse_v2_service_descriptor(rend_service_descriptor_t **parsed_out, char *desc_id_out, diff --git a/src/feature/relay/router.c b/src/feature/relay/router.c index 1f316ebf0..17f63e998 100644 --- a/src/feature/relay/router.c +++ b/src/feature/relay/router.c @@ -717,7 +717,7 @@ load_authority_keyset(int legacy, crypto_pk_t **key_out, fname); goto done; } - parsed = authority_cert_parse_from_string(cert, &eos); + parsed = authority_cert_parse_from_string(cert, strlen(cert), &eos); if (!parsed) { log_warn(LD_DIR, "Unable to parse certificate in %s", fname); goto done; diff --git a/src/test/test_dir.c b/src/test/test_dir.c index 0fa5c3103..078a383dd 100644 --- a/src/test/test_dir.c +++ b/src/test/test_dir.c @@ -2799,11 +2799,17 @@ test_a_networkstatus( MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); /* Parse certificates and keys. */ - cert1 = mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + cert1 = mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); tt_assert(cert1); - cert2 = authority_cert_parse_from_string(AUTHORITY_CERT_2, NULL); + cert2 = authority_cert_parse_from_string(AUTHORITY_CERT_2, + strlen(AUTHORITY_CERT_2), + NULL); tt_assert(cert2); - cert3 = authority_cert_parse_from_string(AUTHORITY_CERT_3, NULL); + cert3 = authority_cert_parse_from_string(AUTHORITY_CERT_3, + strlen(AUTHORITY_CERT_3), + NULL); tt_assert(cert3); sign_skey_1 = crypto_pk_new(); sign_skey_2 = crypto_pk_new(); diff --git a/src/test/test_dir_common.c b/src/test/test_dir_common.c index 6e3bb9945..63bd082ee 100644 --- a/src/test/test_dir_common.c +++ b/src/test/test_dir_common.c @@ -40,14 +40,20 @@ dir_common_authority_pk_init(authority_cert_t **cert1, { /* Parse certificates and keys. */ authority_cert_t *cert; - cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); tt_assert(cert); tt_assert(cert->identity_key); *cert1 = cert; tt_assert(*cert1); - *cert2 = authority_cert_parse_from_string(AUTHORITY_CERT_2, NULL); + *cert2 = authority_cert_parse_from_string(AUTHORITY_CERT_2, + strlen(AUTHORITY_CERT_2), + NULL); tt_assert(*cert2); - *cert3 = authority_cert_parse_from_string(AUTHORITY_CERT_3, NULL); + *cert3 = authority_cert_parse_from_string(AUTHORITY_CERT_3, + strlen(AUTHORITY_CERT_3), + NULL); tt_assert(*cert3); *sign_skey_1 = crypto_pk_new(); *sign_skey_2 = crypto_pk_new(); diff --git a/src/test/test_dir_handle_get.c b/src/test/test_dir_handle_get.c index 09799a0e5..ecb7c1b5f 100644 --- a/src/test/test_dir_handle_get.c +++ b/src/test/test_dir_handle_get.c @@ -1270,7 +1270,9 @@ test_dir_handle_get_server_keys_authority(void* data) size_t body_used = 0; (void) data; - mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, NULL); + mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, + strlen(TEST_CERTIFICATE), + NULL); MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); MOCK(connection_write_to_buf_impl_, connection_write_to_buf_mock); @@ -1420,7 +1422,9 @@ test_dir_handle_get_server_keys_sk(void* data) size_t body_used = 0; (void) data; - mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, NULL); + mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, + strlen(TEST_CERTIFICATE), + NULL); MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); MOCK(connection_write_to_buf_impl_, connection_write_to_buf_mock); @@ -2388,7 +2392,9 @@ test_dir_handle_get_status_vote_next_authority(void* data) routerlist_free_all(); dirvote_free_all(); - mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, NULL); + mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, + strlen(TEST_CERTIFICATE), + NULL); /* create a trusted ds */ ds = trusted_dir_server_new("ds", "127.0.0.1", 9059, 9060, NULL, digest, @@ -2466,7 +2472,9 @@ test_dir_handle_get_status_vote_current_authority(void* data) routerlist_free_all(); dirvote_free_all(); - mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, NULL); + mock_cert = authority_cert_parse_from_string(TEST_CERTIFICATE, + strlen(TEST_CERTIFICATE), + NULL); /* create a trusted ds */ ds = trusted_dir_server_new("ds", "127.0.0.1", 9059, 9060, NULL, digest, diff --git a/src/test/test_routerlist.c b/src/test/test_routerlist.c index bf76570b3..e7c577cf6 100644 --- a/src/test/test_routerlist.c +++ b/src/test/test_routerlist.c @@ -260,7 +260,9 @@ test_router_pick_directory_server_impl(void *arg) /* Init SR subsystem. */ MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); - mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); sr_init(0); UNMOCK(get_my_v3_authority_cert); @@ -472,7 +474,9 @@ test_directory_guard_fetch_with_no_dirinfo(void *arg) /* Initialize the SRV subsystem */ MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); - mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); sr_init(0); UNMOCK(get_my_v3_authority_cert); @@ -645,7 +649,9 @@ test_skew_common(void *arg, time_t now, unsigned long *offset) /* Initialize the SRV subsystem */ MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); - mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); sr_init(0); UNMOCK(get_my_v3_authority_cert); diff --git a/src/test/test_shared_random.c b/src/test/test_shared_random.c index 70adf580a..204361364 100644 --- a/src/test/test_shared_random.c +++ b/src/test/test_shared_random.c @@ -64,7 +64,9 @@ init_authority_state(void) MOCK(get_my_v3_authority_cert, get_my_v3_authority_cert_m); or_options_t *options = get_options_mutable(); - mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + mock_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); tt_assert(mock_cert); options->AuthoritativeDir = 1; tt_int_op(load_ed_keys(options, time(NULL)), OP_GE, 0); @@ -420,7 +422,9 @@ test_sr_commit(void *arg) { /* Setup a minimal dirauth environment for this test */ or_options_t *options = get_options_mutable(); - auth_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + auth_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); tt_assert(auth_cert); options->AuthoritativeDir = 1; @@ -823,7 +827,9 @@ test_sr_setup_commits(void) { /* Setup a minimal dirauth environment for this test */ or_options_t *options = get_options_mutable(); - auth_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, NULL); + auth_cert = authority_cert_parse_from_string(AUTHORITY_CERT_1, + strlen(AUTHORITY_CERT_1), + NULL); tt_assert(auth_cert); options->AuthoritativeDir = 1;

1 0

[tor/master] Replace "read consensus from disk" with "map consensus from disk".
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 7e3005af30b94fd1925b0be475d72875272b9044 Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Sep 7 19:38:21 2018 -0400 Replace "read consensus from disk" with "map consensus from disk". Implements 27244, and should save a bunch of RAM on clients. --- src/feature/dirauth/dirvote.c | 4 +- src/feature/dircache/directory.c | 18 ++++---- src/feature/nodelist/networkstatus.c | 89 +++++++++++++++++++----------------- src/feature/nodelist/networkstatus.h | 4 +- src/test/test_routerlist.c | 3 +- 5 files changed, 65 insertions(+), 53 deletions(-) diff --git a/src/feature/dirauth/dirvote.c b/src/feature/dirauth/dirvote.c index 42821760c..771e0363a 100644 --- a/src/feature/dirauth/dirvote.c +++ b/src/feature/dirauth/dirvote.c @@ -3648,7 +3648,9 @@ dirvote_publish_consensus(void) continue; } - if (networkstatus_set_current_consensus(pending->body, name, 0, NULL)) + if (networkstatus_set_current_consensus(pending->body, + strlen(pending->body), + name, 0, NULL)) log_warn(LD_DIR, "Error publishing %s consensus", name); else log_notice(LD_DIR, "Published %s consensus", name); diff --git a/src/feature/dircache/directory.c b/src/feature/dircache/directory.c index 8e5fc8683..147329902 100644 --- a/src/feature/dircache/directory.c +++ b/src/feature/dircache/directory.c @@ -2606,17 +2606,17 @@ handle_response_fetch_consensus(dir_connection_t *conn, if (looks_like_a_consensus_diff(body, body_len)) { /* First find our previous consensus. Maybe it's in ram, maybe not. */ cached_dir_t *cd = dirserv_get_consensus(flavname); - const char *consensus_body; + const char *consensus_body = NULL; size_t consensus_body_len; - char *owned_consensus = NULL; + tor_mmap_t *mapped_consensus = NULL; if (cd) { consensus_body = cd->dir; consensus_body_len = cd->dir_len; } else { - owned_consensus = networkstatus_read_cached_consensus(flavname); - if (owned_consensus) { - consensus_body = owned_consensus; - consensus_body_len = strlen(consensus_body); + mapped_consensus = networkstatus_map_cached_consensus(flavname); + if (mapped_consensus) { + consensus_body = mapped_consensus->data; + consensus_body_len = mapped_consensus->size; } } if (!consensus_body) { @@ -2629,7 +2629,7 @@ handle_response_fetch_consensus(dir_connection_t *conn, new_consensus = consensus_diff_apply(consensus_body, consensus_body_len, body, body_len); - tor_free(owned_consensus); + tor_munmap_file(mapped_consensus); if (new_consensus == NULL) { log_warn(LD_DIR, "Could not apply consensus diff received from server " "'%s:%d'", conn->base_.address, conn->base_.port); @@ -2651,7 +2651,9 @@ handle_response_fetch_consensus(dir_connection_t *conn, sourcename = "downloaded"; } - if ((r=networkstatus_set_current_consensus(consensus, flavname, 0, + if ((r=networkstatus_set_current_consensus(consensus, + strlen(consensus), + flavname, 0, conn->identity_digest))<0) { log_fn(r<-1?LOG_WARN:LOG_INFO, LD_DIR, "Unable to load %s consensus directory %s from " diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c index 4338fde59..847ca0cdf 100644 --- a/src/feature/nodelist/networkstatus.c +++ b/src/feature/nodelist/networkstatus.c @@ -105,8 +105,6 @@ STATIC networkstatus_t *current_md_consensus = NULL; typedef struct consensus_waiting_for_certs_t { /** The consensus itself. */ networkstatus_t *consensus; - /** The encoded version of the consensus, nul-terminated. */ - char *body; /** When did we set the current value of consensus_waiting_for_certs? If * this is too recent, we shouldn't try to fetch a new consensus for a * little while, to give ourselves time to get certificates for this one. */ @@ -199,14 +197,11 @@ networkstatus_reset_download_failures(void) download_status_reset(&consensus_bootstrap_dl_status[i]); } -/** - * Read and and return the cached consensus of type flavorname. If - * unverified is false, get the one we haven't verified. Return NULL if - * the file isn't there. */ +/** Return the filename used to cache the consensus of a given flavor */ static char * -networkstatus_read_cached_consensus_impl(int flav, - const char *flavorname, - int unverified_consensus) +networkstatus_get_cache_fname(int flav, + const char *flavorname, + int unverified_consensus) { char buf[128]; const char *prefix; @@ -221,21 +216,35 @@ networkstatus_read_cached_consensus_impl(int flav, tor_snprintf(buf, sizeof(buf), "%s-%s-consensus", prefix, flavorname); } - char *filename = get_cachedir_fname(buf); - char *result = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL); + return get_cachedir_fname(buf); +} + +/** + * Read and and return the cached consensus of type flavorname. If + * unverified is false, get the one we haven't verified. Return NULL if + * the file isn't there. */ +static tor_mmap_t * +networkstatus_map_cached_consensus_impl(int flav, + const char *flavorname, + int unverified_consensus) +{ + char *filename = networkstatus_get_cache_fname(flav, + flavorname, + unverified_consensus); + tor_mmap_t *result = tor_mmap_file(filename); tor_free(filename); return result; } -/** Return a new string containing the current cached consensus of flavor - * flavorname. */ -char * -networkstatus_read_cached_consensus(const char *flavorname) - { +/** Map the file containing the current cached consensus of flavor + * flavorname */ +tor_mmap_t * +networkstatus_map_cached_consensus(const char *flavorname) +{ int flav = networkstatus_parse_flavor_name(flavorname); if (flav < 0) return NULL; - return networkstatus_read_cached_consensus_impl(flav, flavorname, 0); + return networkstatus_map_cached_consensus_impl(flav, flavorname, 0); } /** Read every cached v3 consensus networkstatus from the disk. */ @@ -248,24 +257,26 @@ router_reload_consensus_networkstatus(void) /* FFFF Suppress warnings if cached consensus is bad? */ for (flav = 0; flav < N_CONSENSUS_FLAVORS; ++flav) { const char *flavor = networkstatus_get_flavor_name(flav); - char *s = networkstatus_read_cached_consensus_impl(flav, flavor, 0); - if (s) { - if (networkstatus_set_current_consensus(s, flavor, flags, NULL) < -1) { + tor_mmap_t *m = networkstatus_map_cached_consensus_impl(flav, flavor, 0); + if (m) { + if (networkstatus_set_current_consensus(m->data, m->size, + flavor, flags, NULL) < -1) { log_warn(LD_FS, "Couldn't load consensus %s networkstatus from cache", flavor); } - tor_free(s); + tor_munmap_file(m); } - s = networkstatus_read_cached_consensus_impl(flav, flavor, 1); - if (s) { - if (networkstatus_set_current_consensus(s, flavor, + m = networkstatus_map_cached_consensus_impl(flav, flavor, 1); + if (m) { + if (networkstatus_set_current_consensus(m->data, m->size, + flavor, flags | NSSET_WAS_WAITING_FOR_CERTS, NULL)) { log_info(LD_FS, "Couldn't load unverified consensus %s networkstatus " "from cache", flavor); } - tor_free(s); + tor_munmap_file(m); } } @@ -1833,6 +1844,7 @@ warn_early_consensus(const networkstatus_t *c, const char *flavor, */ int networkstatus_set_current_consensus(const char *consensus, + size_t consensus_len, const char *flavor, unsigned flags, const char *source_dir) @@ -1862,7 +1874,7 @@ networkstatus_set_current_consensus(const char *consensus, /* Make sure it's parseable. */ c = networkstatus_parse_vote_from_string(consensus, - strlen(consensus), + consensus_len, NULL, NS_TYPE_CONSENSUS); if (!c) { log_warn(LD_DIR, "Unable to parse networkstatus consensus"); @@ -1951,14 +1963,12 @@ networkstatus_set_current_consensus(const char *consensus, c->valid_after > current_valid_after) { waiting = &consensus_waiting_for_certs[flav]; networkstatus_vote_free(waiting->consensus); - tor_free(waiting->body); waiting->consensus = c; free_consensus = 0; - waiting->body = tor_strdup(consensus); waiting->set_at = now; waiting->dl_failed = 0; if (!from_cache) { - write_str_to_file(unverified_fname, consensus, 0); + write_bytes_to_file(unverified_fname, consensus, consensus_len, 0); } if (dl_certs) authority_certs_fetch_missing(c, now, source_dir); @@ -2049,10 +2059,6 @@ networkstatus_set_current_consensus(const char *consensus, waiting->consensus->valid_after <= c->valid_after) { networkstatus_vote_free(waiting->consensus); waiting->consensus = NULL; - if (consensus != waiting->body) - tor_free(waiting->body); - else - waiting->body = NULL; waiting->set_at = 0; waiting->dl_failed = 0; if (unlink(unverified_fname) != 0) { @@ -2147,14 +2153,16 @@ networkstatus_note_certs_arrived(const char *source_dir) if (!waiting->consensus) continue; if (networkstatus_check_consensus_signature(waiting->consensus, 0)>=0) { - char *waiting_body = waiting->body; - if (!networkstatus_set_current_consensus( - waiting_body, - flavor_name, - NSSET_WAS_WAITING_FOR_CERTS, - source_dir)) { - tor_free(waiting_body); + tor_mmap_t *mapping = networkstatus_map_cached_consensus_impl( + i, flavor_name, 1); + if (mapping) { + networkstatus_set_current_consensus(mapping->data, + mapping->size, + flavor_name, + NSSET_WAS_WAITING_FOR_CERTS, + source_dir); } + tor_munmap_file(mapping); } } } @@ -2730,6 +2738,5 @@ networkstatus_free_all(void) networkstatus_vote_free(waiting->consensus); waiting->consensus = NULL; } - tor_free(waiting->body); } } diff --git a/src/feature/nodelist/networkstatus.h b/src/feature/nodelist/networkstatus.h index cc6badf0b..997d7cfa3 100644 --- a/src/feature/nodelist/networkstatus.h +++ b/src/feature/nodelist/networkstatus.h @@ -16,7 +16,7 @@ void networkstatus_reset_warnings(void); void networkstatus_reset_download_failures(void); -char *networkstatus_read_cached_consensus(const char *flavorname); +tor_mmap_t *networkstatus_map_cached_consensus(const char *flavorname); int router_reload_consensus_networkstatus(void); void routerstatus_free_(routerstatus_t *rs); #define routerstatus_free(rs) \ @@ -108,6 +108,7 @@ int networkstatus_consensus_has_ipv6(const or_options_t* options); #define NSSET_ACCEPT_OBSOLETE 8 #define NSSET_REQUIRE_FLAVOR 16 int networkstatus_set_current_consensus(const char *consensus, + size_t consensus_len, const char *flavor, unsigned flags, const char *source_dir); @@ -159,4 +160,3 @@ extern networkstatus_t *current_md_consensus; #endif /* defined(NETWORKSTATUS_PRIVATE) */ #endif /* !defined(TOR_NETWORKSTATUS_H) */ - diff --git a/src/test/test_routerlist.c b/src/test/test_routerlist.c index 7fe4c15b1..bf76570b3 100644 --- a/src/test/test_routerlist.c +++ b/src/test/test_routerlist.c @@ -659,7 +659,8 @@ test_skew_common(void *arg, time_t now, unsigned long *offset) MOCK(clock_skew_warning, mock_clock_skew_warning); /* Caller will call teardown_capture_of_logs() */ setup_capture_of_logs(LOG_WARN); - retval = networkstatus_set_current_consensus(consensus, "microdesc", 0, + retval = networkstatus_set_current_consensus(consensus, strlen(consensus), + "microdesc", 0, NULL); done:

1 0

[tor/master] Revise networkstatus parsing code to use lengths
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit abaca3fc8c6bc54408084e7514468fa2cd7b3edf Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Sep 11 10:32:17 2018 -0400 Revise networkstatus parsing code to use lengths This way the networkstatus can be parsed without being NUL-terminated, so we can implement 27244 and mmap our consensus objects. --- src/feature/dirauth/dirvote.c | 15 ++++++++---- src/feature/nodelist/networkstatus.c | 4 +++- src/feature/nodelist/routerparse.c | 44 +++++++++++++++++++++--------------- src/feature/nodelist/routerparse.h | 6 +++-- src/test/fuzz/fuzz_consensus.c | 6 ++--- src/test/fuzz/fuzz_vrs.c | 16 ++++++------- src/test/test_dir.c | 32 ++++++++++++++++++++------ src/test/test_dir_common.c | 5 ++-- src/test/test_routerlist.c | 4 +++- 9 files changed, 85 insertions(+), 47 deletions(-) diff --git a/src/feature/dirauth/dirvote.c b/src/feature/dirauth/dirvote.c index 14357c770..42821760c 100644 --- a/src/feature/dirauth/dirvote.c +++ b/src/feature/dirauth/dirvote.c @@ -401,7 +401,8 @@ format_networkstatus_vote(crypto_pk_t *private_signing_key, { networkstatus_t *v; - if (!(v = networkstatus_parse_vote_from_string(status, NULL, + if (!(v = networkstatus_parse_vote_from_string(status, strlen(status), + NULL, v3_ns->type))) { log_err(LD_BUG,"Generated a networkstatus %s we couldn't parse: " "<<%s>>", @@ -2398,7 +2399,8 @@ networkstatus_compute_consensus(smartlist_t *votes, { networkstatus_t *c; - if (!(c = networkstatus_parse_vote_from_string(result, NULL, + if (!(c = networkstatus_parse_vote_from_string(result, strlen(result), + NULL, NS_TYPE_CONSENSUS))) { log_err(LD_BUG, "Generated a networkstatus consensus we couldn't " "parse."); @@ -3121,7 +3123,8 @@ dirvote_add_vote(const char *vote_body, const char **msg_out, int *status_out) *msg_out = NULL; again: - vote = networkstatus_parse_vote_from_string(vote_body, &end_of_vote, + vote = networkstatus_parse_vote_from_string(vote_body, strlen(vote_body), + &end_of_vote, NS_TYPE_VOTE); if (!end_of_vote) end_of_vote = vote_body + strlen(vote_body); @@ -3379,7 +3382,9 @@ dirvote_compute_consensuses(void) flavor_name); continue; } - consensus = networkstatus_parse_vote_from_string(consensus_body, NULL, + consensus = networkstatus_parse_vote_from_string(consensus_body, + strlen(consensus_body), + NULL, NS_TYPE_CONSENSUS); if (!consensus) { log_warn(LD_DIR, "Couldn't parse %s consensus we generated!", @@ -3518,7 +3523,7 @@ dirvote_add_signatures_to_pending_consensus( * just in case we break detached signature processing at some point. */ { networkstatus_t *v = networkstatus_parse_vote_from_string( - pc->body, NULL, + pc->body, strlen(pc->body), NULL, NS_TYPE_CONSENSUS); tor_assert(v); networkstatus_vote_free(v); diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c index 6492b828b..4338fde59 100644 --- a/src/feature/nodelist/networkstatus.c +++ b/src/feature/nodelist/networkstatus.c @@ -1861,7 +1861,9 @@ networkstatus_set_current_consensus(const char *consensus, } /* Make sure it's parseable. */ - c = networkstatus_parse_vote_from_string(consensus, NULL, NS_TYPE_CONSENSUS); + c = networkstatus_parse_vote_from_string(consensus, + strlen(consensus), + NULL, NS_TYPE_CONSENSUS); if (!c) { log_warn(LD_DIR, "Unable to parse networkstatus consensus"); result = -2; diff --git a/src/feature/nodelist/routerparse.c b/src/feature/nodelist/routerparse.c index 9c51799d9..9abdfb614 100644 --- a/src/feature/nodelist/routerparse.c +++ b/src/feature/nodelist/routerparse.c @@ -1057,9 +1057,10 @@ router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, /** Set digests to all the digests of the consensus document in * s */ int -router_get_networkstatus_v3_hashes(const char *s, common_digests_t *digests) +router_get_networkstatus_v3_hashes(const char *s, size_t len, + common_digests_t *digests) { - return router_get_hashes_impl(s,strlen(s),digests, + return router_get_hashes_impl(s, len, digests, "network-status-version", "\ndirectory-signature", ' '); @@ -2489,18 +2490,19 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string) return NULL; } -/** Helper: given a string s, return the start of the next router-status +/** Helper: given a string s ending at s_eos, return the + * start of the next router-status * object (starting with "r " at the start of a line). If none is found, * return the start of the directory footer, or the next directory signature. * If none is found, return the end of the string. */ static inline const char * -find_start_of_next_routerstatus(const char *s) +find_start_of_next_routerstatus(const char *s, const char *s_eos) { const char *eos, *footer, *sig; - if ((eos = strstr(s, "\nr "))) + if ((eos = tor_memstr(s, s_eos - s, "\nr "))) ++eos; else - eos = s + strlen(s); + eos = s_eos; footer = tor_memstr(s, eos-s, "\ndirectory-footer"); sig = tor_memstr(s, eos-s, "\ndirectory-signature"); @@ -2632,7 +2634,8 @@ summarize_protover_flags(protover_summary_flags_t *out, **/ STATIC routerstatus_t * routerstatus_parse_entry_from_string(memarea_t *area, - const char **s, smartlist_t *tokens, + const char **s, const char *s_eos, + smartlist_t *tokens, networkstatus_t *vote, vote_routerstatus_t *vote_rs, int consensus_method, @@ -2651,7 +2654,7 @@ routerstatus_parse_entry_from_string(memarea_t *area, flav = FLAV_NS; tor_assert(flav == FLAV_NS || flav == FLAV_MICRODESC); - eos = find_start_of_next_routerstatus(*s); + eos = find_start_of_next_routerstatus(*s, s_eos); if (tokenize_string(area,*s, eos, tokens, rtrstatus_token_table,0)) { log_warn(LD_DIR, "Error tokenizing router status"); @@ -3394,7 +3397,9 @@ extract_shared_random_srvs(networkstatus_t *ns, smartlist_t *tokens) /** Parse a v3 networkstatus vote, opinion, or consensus (depending on * ns_type), from s, and return the result. Return NULL on failure. */ networkstatus_t * -networkstatus_parse_vote_from_string(const char *s, const char **eos_out, +networkstatus_parse_vote_from_string(const char *s, + size_t s_len, + const char **eos_out, networkstatus_type_t ns_type) { smartlist_t *tokens = smartlist_new(); @@ -3410,21 +3415,22 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, memarea_t *area = NULL, *rs_area = NULL; consensus_flavor_t flav = FLAV_NS; char *last_kwd=NULL; + const char *eos = s + s_len; tor_assert(s); if (eos_out) *eos_out = NULL; - if (router_get_networkstatus_v3_hashes(s, &ns_digests) || + if (router_get_networkstatus_v3_hashes(s, s_len, &ns_digests) || router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, - s, strlen(s))<0) { + s, s_len)<0) { log_warn(LD_DIR, "Unable to compute digest of network-status"); goto err; } area = memarea_new(); - end_of_header = find_start_of_next_routerstatus(s); + end_of_header = find_start_of_next_routerstatus(s, eos); if (tokenize_string(area, s, end_of_header, tokens, (ns_type == NS_TYPE_CONSENSUS) ? networkstatus_consensus_token_table : @@ -3455,7 +3461,8 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, if (ns_type != NS_TYPE_CONSENSUS) { const char *end_of_cert = NULL; - if (!(cert = strstr(s, "\ndir-key-certificate-version"))) + if (!(cert = tor_memstr(s, end_of_header - s, + "\ndir-key-certificate-version"))) goto err; ++cert; ns->cert = authority_cert_parse_from_string(cert, &end_of_cert); @@ -3768,10 +3775,10 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, s = end_of_header; ns->routerstatus_list = smartlist_new(); - while (!strcmpstart(s, "r ")) { + while (eos-s >= 2 && fast_memeq(s, "r ", 2)) { if (ns->type != NS_TYPE_CONSENSUS) { vote_routerstatus_t *rs = tor_malloc_zero(sizeof(vote_routerstatus_t)); - if (routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, ns, + if (routerstatus_parse_entry_from_string(rs_area, &s, eos, rs_tokens, ns, rs, 0, 0)) { smartlist_add(ns->routerstatus_list, rs); } else { @@ -3779,7 +3786,8 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, } } else { routerstatus_t *rs; - if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, + if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, eos, + rs_tokens, NULL, NULL, ns->consensus_method, flav))) { @@ -3824,10 +3832,10 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, /* Parse footer; check signature. */ footer_tokens = smartlist_new(); - if ((end_of_footer = strstr(s, "\nnetwork-status-version "))) + if ((end_of_footer = tor_memstr(s, eos-s, "\nnetwork-status-version "))) ++end_of_footer; else - end_of_footer = s + strlen(s); + end_of_footer = eos; if (tokenize_string(area,s, end_of_footer, footer_tokens, networkstatus_vote_footer_token_table, 0)) { log_warn(LD_DIR, "Error tokenizing network-status vote footer."); diff --git a/src/feature/nodelist/routerparse.h b/src/feature/nodelist/routerparse.h index be455984d..390088c94 100644 --- a/src/feature/nodelist/routerparse.h +++ b/src/feature/nodelist/routerparse.h @@ -30,7 +30,7 @@ enum networkstatus_type_t; int router_get_router_hash(const char *s, size_t s_len, char *digest); int router_get_dir_hash(const char *s, char *digest); -int router_get_networkstatus_v3_hashes(const char *s, +int router_get_networkstatus_v3_hashes(const char *s, size_t len, common_digests_t *digests); int router_get_networkstatus_v3_signed_boundaries(const char *s, size_t len, const char **start_out, @@ -81,6 +81,7 @@ void dump_distinct_digest_count(int severity); int compare_vote_routerstatus_entries(const void **_a, const void **_b); int networkstatus_verify_bw_weights(networkstatus_t *ns, int); networkstatus_t *networkstatus_parse_vote_from_string(const char *s, + size_t len, const char **eos_out, enum networkstatus_type_t ns_type); ns_detached_signatures_t *networkstatus_parse_detached_signatures( @@ -139,7 +140,8 @@ STATIC void dump_desc_fifo_cleanup(void); struct memarea_t; STATIC routerstatus_t *routerstatus_parse_entry_from_string( struct memarea_t *area, - const char **s, smartlist_t *tokens, + const char **s, const char *eos, + smartlist_t *tokens, networkstatus_t *vote, vote_routerstatus_t *vote_rs, int consensus_method, diff --git a/src/test/fuzz/fuzz_consensus.c b/src/test/fuzz/fuzz_consensus.c index b170fd33d..5a04683a1 100644 --- a/src/test/fuzz/fuzz_consensus.c +++ b/src/test/fuzz/fuzz_consensus.c @@ -59,13 +59,13 @@ int fuzz_main(const uint8_t *data, size_t sz) { networkstatus_t *ns; - char *str = tor_memdup_nulterm(data, sz); const char *eos = NULL; networkstatus_type_t tp = NS_TYPE_CONSENSUS; if (tor_memstr(data, MIN(sz, 1024), "tus vote")) tp = NS_TYPE_VOTE; const char *what = (tp == NS_TYPE_CONSENSUS) ? "consensus" : "vote"; - ns = networkstatus_parse_vote_from_string(str, + ns = networkstatus_parse_vote_from_string((const char *)data, + sz, &eos, tp); if (ns) { @@ -74,6 +74,6 @@ fuzz_main(const uint8_t *data, size_t sz) } else { log_debug(LD_GENERAL, "Parsing as %s failed", what); } - tor_free(str); + return 0; } diff --git a/src/test/fuzz/fuzz_vrs.c b/src/test/fuzz/fuzz_vrs.c index 8c96851b1..5665ffeac 100644 --- a/src/test/fuzz/fuzz_vrs.c +++ b/src/test/fuzz/fuzz_vrs.c @@ -52,24 +52,24 @@ fuzz_cleanup(void) int fuzz_main(const uint8_t *data, size_t sz) { - char *str = tor_memdup_nulterm(data, sz); const char *s; routerstatus_t *rs_ns = NULL, *rs_md = NULL, *rs_vote = NULL; vote_routerstatus_t *vrs = tor_malloc_zero(sizeof(*vrs)); smartlist_t *tokens = smartlist_new(); + const char *eos = (const char *)data + sz; - s = str; - rs_ns = routerstatus_parse_entry_from_string(area, &s, tokens, + s = (const char *)data; + rs_ns = routerstatus_parse_entry_from_string(area, &s, eos, tokens, NULL, NULL, 26, FLAV_NS); tor_assert(smartlist_len(tokens) == 0); - s = str; - rs_md = routerstatus_parse_entry_from_string(area, &s, tokens, + s = (const char *)data; + rs_md = routerstatus_parse_entry_from_string(area, &s, eos, tokens, NULL, NULL, 26, FLAV_MICRODESC); tor_assert(smartlist_len(tokens) == 0); - s = str; - rs_vote = routerstatus_parse_entry_from_string(area, &s, tokens, + s = (const char *)data; + rs_vote = routerstatus_parse_entry_from_string(area, &s, eos, tokens, dummy_vote, vrs, 26, FLAV_NS); tor_assert(smartlist_len(tokens) == 0); @@ -81,6 +81,6 @@ fuzz_main(const uint8_t *data, size_t sz) vote_routerstatus_free(vrs); memarea_clear(area); smartlist_free(tokens); - tor_free(str); + return 0; } diff --git a/src/test/test_dir.c b/src/test/test_dir.c index 723799ee8..0fa5c3103 100644 --- a/src/test/test_dir.c +++ b/src/test/test_dir.c @@ -70,6 +70,23 @@ #define NS_MODULE dir +static networkstatus_t * +networkstatus_parse_vote_from_string_(const char *s, + const char **eos_out, + enum networkstatus_type_t ns_type) +{ + size_t len = strlen(s); + // memdup so that it won't be nul-terminated. + char *tmp = tor_memdup(s, len); + networkstatus_t *result = + networkstatus_parse_vote_from_string(tmp, len, eos_out, ns_type); + if (eos_out && *eos_out) { + *eos_out = s + (*eos_out - tmp); + } + tor_free(tmp); + return result; +} + static void test_dir_nicknames(void *arg) { @@ -2888,7 +2905,7 @@ test_a_networkstatus( sign_skey_leg1, FLAV_NS); tt_assert(consensus_text); - con = networkstatus_parse_vote_from_string(consensus_text, NULL, + con = networkstatus_parse_vote_from_string_(consensus_text, NULL, NS_TYPE_CONSENSUS); tt_assert(con); //log_notice(LD_GENERAL, "<<%s>>\n<<%s>>\n<<%s>>\n", @@ -2900,7 +2917,7 @@ test_a_networkstatus( sign_skey_leg1, FLAV_MICRODESC); tt_assert(consensus_text_md); - con_md = networkstatus_parse_vote_from_string(consensus_text_md, NULL, + con_md = networkstatus_parse_vote_from_string_(consensus_text_md, NULL, NS_TYPE_CONSENSUS); tt_assert(con_md); tt_int_op(con_md->flavor,OP_EQ, FLAV_MICRODESC); @@ -2999,13 +3016,13 @@ test_a_networkstatus( tt_assert(consensus_text3); tt_assert(consensus_text_md2); tt_assert(consensus_text_md3); - con2 = networkstatus_parse_vote_from_string(consensus_text2, NULL, + con2 = networkstatus_parse_vote_from_string_(consensus_text2, NULL, NS_TYPE_CONSENSUS); - con3 = networkstatus_parse_vote_from_string(consensus_text3, NULL, + con3 = networkstatus_parse_vote_from_string_(consensus_text3, NULL, NS_TYPE_CONSENSUS); - con_md2 = networkstatus_parse_vote_from_string(consensus_text_md2, NULL, + con_md2 = networkstatus_parse_vote_from_string_(consensus_text_md2, NULL, NS_TYPE_CONSENSUS); - con_md3 = networkstatus_parse_vote_from_string(consensus_text_md3, NULL, + con_md3 = networkstatus_parse_vote_from_string_(consensus_text_md3, NULL, NS_TYPE_CONSENSUS); tt_assert(con2); tt_assert(con3); @@ -6020,9 +6037,10 @@ test_dir_assumed_flags(void *arg) "192.168.0.1 9001 0\n" "m thisoneislongerbecauseitisa256bitmddigest33\n" "s Fast Guard Stable\n"; + const char *eos = str1 + strlen(str1); const char *cp = str1; - rs = routerstatus_parse_entry_from_string(area, &cp, tokens, NULL, NULL, + rs = routerstatus_parse_entry_from_string(area, &cp, eos, tokens, NULL, NULL, 24, FLAV_MICRODESC); tt_assert(rs); tt_assert(rs->is_flagged_running); diff --git a/src/test/test_dir_common.c b/src/test/test_dir_common.c index e65e2b011..6e3bb9945 100644 --- a/src/test/test_dir_common.c +++ b/src/test/test_dir_common.c @@ -264,7 +264,9 @@ dir_common_add_rs_and_parse(networkstatus_t *vote, networkstatus_t **vote_out, /* dump the vote and try to parse it. */ v_text = format_networkstatus_vote(sign_skey, vote); tt_assert(v_text); - *vote_out = networkstatus_parse_vote_from_string(v_text, NULL, NS_TYPE_VOTE); + *vote_out = networkstatus_parse_vote_from_string(v_text, + strlen(v_text), + NULL, NS_TYPE_VOTE); done: if (v_text) @@ -422,4 +424,3 @@ dir_common_construct_vote_3(networkstatus_t **vote, authority_cert_t *cert, return 0; } - diff --git a/src/test/test_routerlist.c b/src/test/test_routerlist.c index 89d1f4f90..7fe4c15b1 100644 --- a/src/test/test_routerlist.c +++ b/src/test/test_routerlist.c @@ -270,7 +270,9 @@ test_router_pick_directory_server_impl(void *arg) construct_consensus(&consensus_text_md, now); tt_assert(consensus_text_md); - con_md = networkstatus_parse_vote_from_string(consensus_text_md, NULL, + con_md = networkstatus_parse_vote_from_string(consensus_text_md, + strlen(consensus_text_md), + NULL, NS_TYPE_CONSENSUS); tt_assert(con_md); tt_int_op(con_md->flavor,OP_EQ, FLAV_MICRODESC);

1 0

[tor/master] Merge branch 'networkstatus_mmap_merge'
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 672e26cad837e368dfe39d53546b85afd69ad75c Merge: a18230115 988d4903a Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Oct 31 10:06:30 2018 -0400 Merge branch 'networkstatus_mmap_merge' changes/feature27244 | 5 ++ src/feature/control/control.c | 6 ++- src/feature/dirauth/dirvote.c | 19 ++++--- src/feature/dircache/consdiffmgr.c | 83 +++++++++++++++++++++--------- src/feature/dircache/consdiffmgr.h | 11 +++- src/feature/dircache/dirserv.c | 5 +- src/feature/dircache/dirserv.h | 1 + src/feature/dirclient/dirclient.c | 22 +++++--- src/feature/dircommon/consdiff.c | 42 ++++++++------- src/feature/dircommon/consdiff.h | 15 +++--- src/feature/dirparse/authcert_parse.c | 16 +++--- src/feature/dirparse/authcert_parse.h | 1 + src/feature/dirparse/ns_parse.c | 55 ++++++++++++-------- src/feature/dirparse/ns_parse.h | 10 ++-- src/feature/nodelist/authcert.c | 3 +- src/feature/nodelist/networkstatus.c | 96 +++++++++++++++++++---------------- src/feature/nodelist/networkstatus.h | 4 +- src/feature/relay/router.c | 2 +- src/test/bench.c | 6 ++- src/test/fuzz/fuzz_consensus.c | 6 +-- src/test/fuzz/fuzz_diff.c | 32 +++++++----- src/test/fuzz/fuzz_diff_apply.c | 13 +++-- src/test/fuzz/fuzz_vrs.c | 16 +++--- src/test/test_consdiff.c | 94 +++++++++++++++++++++++----------- src/test/test_consdiffmgr.c | 41 +++++++++++---- src/test/test_dir.c | 44 ++++++++++++---- src/test/test_dir_common.c | 17 +++++-- src/test/test_dir_handle_get.c | 18 +++++-- src/test/test_routerlist.c | 19 +++++-- src/test/test_shared_random.c | 12 +++-- 30 files changed, 467 insertions(+), 247 deletions(-)

1 0

[tor/master] Merge branch 'networkstatus_mmap' into networkstatus_mmap_merge
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 988d4903a3fc23153896e0daf7738f87ade9bc4b Merge: a18230115 594140574 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Oct 31 09:04:12 2018 -0400 Merge branch 'networkstatus_mmap' into networkstatus_mmap_merge changes/feature27244 | 5 ++ src/feature/control/control.c | 6 ++- src/feature/dirauth/dirvote.c | 19 ++++--- src/feature/dircache/consdiffmgr.c | 83 +++++++++++++++++++++--------- src/feature/dircache/consdiffmgr.h | 11 +++- src/feature/dircache/dirserv.c | 5 +- src/feature/dircache/dirserv.h | 1 + src/feature/dirclient/dirclient.c | 22 +++++--- src/feature/dircommon/consdiff.c | 42 ++++++++------- src/feature/dircommon/consdiff.h | 15 +++--- src/feature/dirparse/authcert_parse.c | 16 +++--- src/feature/dirparse/authcert_parse.h | 1 + src/feature/dirparse/ns_parse.c | 55 ++++++++++++-------- src/feature/dirparse/ns_parse.h | 10 ++-- src/feature/nodelist/authcert.c | 3 +- src/feature/nodelist/networkstatus.c | 96 +++++++++++++++++++---------------- src/feature/nodelist/networkstatus.h | 4 +- src/feature/relay/router.c | 2 +- src/test/bench.c | 6 ++- src/test/fuzz/fuzz_consensus.c | 6 +-- src/test/fuzz/fuzz_diff.c | 32 +++++++----- src/test/fuzz/fuzz_diff_apply.c | 13 +++-- src/test/fuzz/fuzz_vrs.c | 16 +++--- src/test/test_consdiff.c | 94 +++++++++++++++++++++++----------- src/test/test_consdiffmgr.c | 41 +++++++++++---- src/test/test_dir.c | 44 ++++++++++++---- src/test/test_dir_common.c | 17 +++++-- src/test/test_dir_handle_get.c | 18 +++++-- src/test/test_routerlist.c | 19 +++++-- src/test/test_shared_random.c | 12 +++-- 30 files changed, 467 insertions(+), 247 deletions(-) diff --cc src/feature/control/control.c index f0db97dc8,9e7d21308..3fa47747e --- a/src/feature/control/control.c +++ b/src/feature/control/control.c @@@ -2352,7 -2341,9 +2352,11 @@@ getinfo_helper_dir(control_connection_ *answer = tor_strdup(consensus->dir); } if (!*answer) { /* try loading it from disk */ - *answer = networkstatus_read_cached_consensus("ns"); - char *filename = get_cachedir_fname("cached-consensus"); - *answer = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL); - tor_free(filename); ++ tor_mmap_t *mapped = networkstatus_map_cached_consensus("ns"); ++ if (mapped) { ++ *answer = tor_memdup_nulterm(mapped->data, mapped->size); ++ tor_munmap_file(mapped); ++ } if (!*answer) { /* generate an error */ *errmsg = "Could not open cached consensus. " "Make sure FetchUselessDescriptors is set to 1."; diff --cc src/feature/dircache/dirserv.c index 57178cd50,433d3f4ce..4366000e2 --- a/src/feature/dircache/dirserv.c +++ b/src/feature/dircache/dirserv.c @@@ -95,173 -1133,1591 +95,176 @@@ directory_fetches_from_authorities(cons me = router_get_my_routerinfo(); if (!me || (!me->supports_tunnelled_dir_requests && !refuseunknown)) return 0; /* if we don't service directory requests, return 0 too */ - return 1; -} - -/** Return 1 if we should fetch new networkstatuses, descriptors, etc - * on the "mirror" schedule rather than the "client" schedule. - */ -int -directory_fetches_dir_info_early(const or_options_t *options) -{ - return directory_fetches_from_authorities(options); -} - -/** Return 1 if we should fetch new networkstatuses, descriptors, etc - * on a very passive schedule -- waiting long enough for ordinary clients - * to probably have the info we want. These would include bridge users, - * and maybe others in the future e.g. if a Tor client uses another Tor - * client as a directory guard. - */ -int -directory_fetches_dir_info_later(const or_options_t *options) -{ - return options->UseBridges != 0; -} - -/** Return true iff we want to serve certificates for authorities - * that we don't acknowledge as authorities ourself. - * Use we_want_to_fetch_unknown_auth_certs to check if we want to fetch - * and keep these certificates. - */ -int -directory_caches_unknown_auth_certs(const or_options_t *options) -{ - return dir_server_mode(options) || options->BridgeRelay; -} - -/** Return 1 if we want to fetch and serve descriptors, networkstatuses, etc - * Else return 0. - * Check options->DirPort_set and directory_permits_begindir_requests() - * to see if we are willing to serve these directory documents to others via - * the DirPort and begindir-over-ORPort, respectively. - * - * To check if we should fetch documents, use we_want_to_fetch_flavor and - * we_want_to_fetch_unknown_auth_certs instead of this function. - */ -int -directory_caches_dir_info(const or_options_t *options) -{ - if (options->BridgeRelay || dir_server_mode(options)) - return 1; - if (!server_mode(options) || !advertised_server_mode()) - return 0; - /* We need an up-to-date view of network info if we're going to try to - * block exit attempts from unknown relays. */ - return ! router_my_exit_policy_is_reject_star() && - should_refuse_unknown_exits(options); -} - -/** Return 1 if we want to allow remote clients to ask us directory - * requests via the "begin_dir" interface, which doesn't require - * having any separate port open. */ -int -directory_permits_begindir_requests(const or_options_t *options) -{ - return options->BridgeRelay != 0 || dir_server_mode(options); -} - -/** Return 1 if we have no need to fetch new descriptors. This generally - * happens when we're not a dir cache and we haven't built any circuits - * lately. - */ -int -directory_too_idle_to_fetch_descriptors(const or_options_t *options, - time_t now) -{ - return !directory_caches_dir_info(options) && - !options->FetchUselessDescriptors && - rep_hist_circbuilding_dormant(now); -} - -/********************************************************************/ - -/** Map from flavor name to the cached_dir_t for the v3 consensuses that we're - * currently serving. */ -static strmap_t *cached_consensuses = NULL; - -/** Decrement the reference count on d, and free it if it no longer has - * any references. */ -void -cached_dir_decref(cached_dir_t *d) -{ - if (!d || --d->refcnt > 0) - return; - clear_cached_dir(d); - tor_free(d); -} - -/** Allocate and return a new cached_dir_t containing the string s, - * published at published. */ -cached_dir_t * -new_cached_dir(char *s, time_t published) -{ - cached_dir_t *d = tor_malloc_zero(sizeof(cached_dir_t)); - d->refcnt = 1; - d->dir = s; - d->dir_len = strlen(s); - d->published = published; - if (tor_compress(&(d->dir_compressed), &(d->dir_compressed_len), - d->dir, d->dir_len, ZLIB_METHOD)) { - log_warn(LD_BUG, "Error compressing directory"); - } - return d; -} - -/** Remove all storage held in d, but do not free d itself. */ -static void -clear_cached_dir(cached_dir_t *d) -{ - tor_free(d->dir); - tor_free(d->dir_compressed); - memset(d, 0, sizeof(cached_dir_t)); -} - -/** Free all storage held by the cached_dir_t in d. */ -static void -free_cached_dir_(void *_d) -{ - cached_dir_t *d; - if (!_d) - return; - - d = (cached_dir_t *)_d; - cached_dir_decref(d); -} - -/** Replace the v3 consensus networkstatus of type flavor_name that - * we're serving with networkstatus, published at published. No - * validation is performed. */ -void -dirserv_set_cached_consensus_networkstatus(const char *networkstatus, - size_t networkstatus_len, - const char *flavor_name, - const common_digests_t *digests, - const uint8_t *sha3_as_signed, - time_t published) -{ - cached_dir_t *new_networkstatus; - cached_dir_t *old_networkstatus; - if (!cached_consensuses) - cached_consensuses = strmap_new(); - - new_networkstatus = - new_cached_dir(tor_memdup_nulterm(networkstatus, networkstatus_len), - published); - memcpy(&new_networkstatus->digests, digests, sizeof(common_digests_t)); - memcpy(&new_networkstatus->digest_sha3_as_signed, sha3_as_signed, - DIGEST256_LEN); - old_networkstatus = strmap_set(cached_consensuses, flavor_name, - new_networkstatus); - if (old_networkstatus) - cached_dir_decref(old_networkstatus); -} - -/** Return the latest downloaded consensus networkstatus in encoded, signed, - * optionally compressed format, suitable for sending to clients. */ -cached_dir_t * -dirserv_get_consensus(const char *flavor_name) -{ - if (!cached_consensuses) - return NULL; - return strmap_get(cached_consensuses, flavor_name); -} - -/** If a router's uptime is at least this value, then it is always - * considered stable, regardless of the rest of the network. This - * way we resist attacks where an attacker doubles the size of the - * network using allegedly high-uptime nodes, displacing all the - * current guards. */ -#define UPTIME_TO_GUARANTEE_STABLE (3600*24*30) -/** If a router's MTBF is at least this value, then it is always stable. - * See above. (Corresponds to about 7 days for current decay rates.) */ -#define MTBF_TO_GUARANTEE_STABLE (60*60*24*5) -/** Similarly, every node with at least this much weighted time known can be - * considered familiar enough to be a guard. Corresponds to about 20 days for - * current decay rates. - */ -#define TIME_KNOWN_TO_GUARANTEE_FAMILIAR (8*24*60*60) -/** Similarly, every node with sufficient WFU is around enough to be a guard. - */ -#define WFU_TO_GUARANTEE_GUARD (0.98) - -/* Thresholds for server performance: set by - * dirserv_compute_performance_thresholds, and used by - * generate_v2_networkstatus */ - -/** Any router with an uptime of at least this value is stable. */ -static uint32_t stable_uptime = 0; /* start at a safe value */ -/** Any router with an mtbf of at least this value is stable. */ -static double stable_mtbf = 0.0; -/** If true, we have measured enough mtbf info to look at stable_mtbf rather - * than stable_uptime. */ -static int enough_mtbf_info = 0; -/** Any router with a weighted fractional uptime of at least this much might - * be good as a guard. */ -static double guard_wfu = 0.0; -/** Don't call a router a guard unless we've known about it for at least this - * many seconds. */ -static long guard_tk = 0; -/** Any router with a bandwidth at least this high is "Fast" */ -static uint32_t fast_bandwidth_kb = 0; -/** If exits can be guards, then all guards must have a bandwidth this - * high. */ -static uint32_t guard_bandwidth_including_exits_kb = 0; -/** If exits can't be guards, then all guards must have a bandwidth this - * high. */ -static uint32_t guard_bandwidth_excluding_exits_kb = 0; - -/** Helper: estimate the uptime of a router given its stated uptime and the - * amount of time since it last stated its stated uptime. */ -static inline long -real_uptime(const routerinfo_t *router, time_t now) -{ - if (now < router->cache_info.published_on) - return router->uptime; - else - return router->uptime + (now - router->cache_info.published_on); -} - -/** Return 1 if router is not suitable for these parameters, else 0. - * If need_uptime is non-zero, we require a minimum uptime. - * If need_capacity is non-zero, we require a minimum advertised - * bandwidth. - */ -static int -dirserv_thinks_router_is_unreliable(time_t now, - routerinfo_t *router, - int need_uptime, int need_capacity) -{ - if (need_uptime) { - if (!enough_mtbf_info) { - /* XXXX We should change the rule from - * "use uptime if we don't have mtbf data" to "don't advertise Stable on - * v3 if we don't have enough mtbf data." Or maybe not, since if we ever - * hit a point where we need to reset a lot of authorities at once, - * none of them would be in a position to declare Stable. - */ - long uptime = real_uptime(router, now); - if ((unsigned)uptime < stable_uptime && - (unsigned)uptime < UPTIME_TO_GUARANTEE_STABLE) - return 1; - } else { - double mtbf = - rep_hist_get_stability(router->cache_info.identity_digest, now); - if (mtbf < stable_mtbf && - mtbf < MTBF_TO_GUARANTEE_STABLE) - return 1; - } - } - if (need_capacity) { - uint32_t bw_kb = dirserv_get_credible_bandwidth_kb(router); - if (bw_kb < fast_bandwidth_kb) - return 1; - } - return 0; -} - -/** Return true iff router should be assigned the "HSDir" flag. - * - * Right now this means it advertises support for it, it has a high uptime, - * it's a directory cache, it has the Stable and Fast flags, and it's currently - * considered Running. - * - * This function needs to be called after router-\>is_running has - * been set. - */ -static int -dirserv_thinks_router_is_hs_dir(const routerinfo_t *router, - const node_t *node, time_t now) -{ - - long uptime; - - /* If we haven't been running for at least - * get_options()->MinUptimeHidServDirectoryV2 seconds, we can't - * have accurate data telling us a relay has been up for at least - * that long. We also want to allow a bit of slack: Reachability - * tests aren't instant. If we haven't been running long enough, - * trust the relay. */ - - if (get_uptime() > - get_options()->MinUptimeHidServDirectoryV2 * 1.1) - uptime = MIN(rep_hist_get_uptime(router->cache_info.identity_digest, now), - real_uptime(router, now)); - else - uptime = real_uptime(router, now); - - return (router->wants_to_be_hs_dir && - router->supports_tunnelled_dir_requests && - node->is_stable && node->is_fast && - uptime >= get_options()->MinUptimeHidServDirectoryV2 && - router_is_active(router, node, now)); -} - -/** Don't consider routers with less bandwidth than this when computing - * thresholds. */ -#define ABSOLUTE_MIN_BW_VALUE_TO_CONSIDER_KB 4 - -/** Helper for dirserv_compute_performance_thresholds(): Decide whether to - * include a router in our calculations, and return true iff we should; the - * require_mbw parameter is passed in by - * dirserv_compute_performance_thresholds() and controls whether we ever - * count routers with only advertised bandwidths */ -static int -router_counts_toward_thresholds(const node_t *node, time_t now, - const digestmap_t *omit_as_sybil, - int require_mbw) -{ - /* Have measured bw? */ - int have_mbw = - dirserv_has_measured_bw(node->identity); - uint64_t min_bw_kb = ABSOLUTE_MIN_BW_VALUE_TO_CONSIDER_KB; - const or_options_t *options = get_options(); - - if (options->TestingTorNetwork) { - min_bw_kb = (int64_t)options->TestingMinExitFlagThreshold / 1000; - } - - return node->ri && router_is_active(node->ri, node, now) && - !digestmap_get(omit_as_sybil, node->identity) && - (dirserv_get_credible_bandwidth_kb(node->ri) >= min_bw_kb) && - (have_mbw || !require_mbw); -} - -/** Look through the routerlist, and using the measured bandwidth cache count - * how many measured bandwidths we know. This is used to decide whether we - * ever trust advertised bandwidths for purposes of assigning flags. */ -void -dirserv_count_measured_bws(const smartlist_t *routers) -{ - /* Initialize this first */ - routers_with_measured_bw = 0; - - /* Iterate over the routerlist and count measured bandwidths */ - SMARTLIST_FOREACH_BEGIN(routers, const routerinfo_t *, ri) { - /* Check if we know a measured bandwidth for this one */ - if (dirserv_has_measured_bw(ri->cache_info.identity_digest)) { - ++routers_with_measured_bw; - } - } SMARTLIST_FOREACH_END(ri); -} - -/** Look through the routerlist, the Mean Time Between Failure history, and - * the Weighted Fractional Uptime history, and use them to set thresholds for - * the Stable, Fast, and Guard flags. Update the fields stable_uptime, - * stable_mtbf, enough_mtbf_info, guard_wfu, guard_tk, fast_bandwidth, - * guard_bandwidth_including_exits, and guard_bandwidth_excluding_exits. - * - * Also, set the is_exit flag of each router appropriately. */ -void -dirserv_compute_performance_thresholds(digestmap_t *omit_as_sybil) -{ - int n_active, n_active_nonexit, n_familiar; - uint32_t *uptimes, *bandwidths_kb, *bandwidths_excluding_exits_kb; - long *tks; - double *mtbfs, *wfus; - smartlist_t *nodelist; - time_t now = time(NULL); - const or_options_t *options = get_options(); - - /* Require mbw? */ - int require_mbw = - (routers_with_measured_bw > - options->MinMeasuredBWsForAuthToIgnoreAdvertised) ? 1 : 0; - - /* initialize these all here, in case there are no routers */ - stable_uptime = 0; - stable_mtbf = 0; - fast_bandwidth_kb = 0; - guard_bandwidth_including_exits_kb = 0; - guard_bandwidth_excluding_exits_kb = 0; - guard_tk = 0; - guard_wfu = 0; - - nodelist_assert_ok(); - nodelist = nodelist_get_list(); - - /* Initialize arrays that will hold values for each router. We'll - * sort them and use that to compute thresholds. */ - n_active = n_active_nonexit = 0; - /* Uptime for every active router. */ - uptimes = tor_calloc(smartlist_len(nodelist), sizeof(uint32_t)); - /* Bandwidth for every active router. */ - bandwidths_kb = tor_calloc(smartlist_len(nodelist), sizeof(uint32_t)); - /* Bandwidth for every active non-exit router. */ - bandwidths_excluding_exits_kb = - tor_calloc(smartlist_len(nodelist), sizeof(uint32_t)); - /* Weighted mean time between failure for each active router. */ - mtbfs = tor_calloc(smartlist_len(nodelist), sizeof(double)); - /* Time-known for each active router. */ - tks = tor_calloc(smartlist_len(nodelist), sizeof(long)); - /* Weighted fractional uptime for each active router. */ - wfus = tor_calloc(smartlist_len(nodelist), sizeof(double)); - - /* Now, fill in the arrays. */ - SMARTLIST_FOREACH_BEGIN(nodelist, node_t *, node) { - if (options->BridgeAuthoritativeDir && - node->ri && - node->ri->purpose != ROUTER_PURPOSE_BRIDGE) - continue; - - routerinfo_t *ri = node->ri; - if (ri) { - node->is_exit = (!router_exit_policy_rejects_all(ri) && - exit_policy_is_general_exit(ri->exit_policy)); - } - - if (router_counts_toward_thresholds(node, now, omit_as_sybil, - require_mbw)) { - const char *id = node->identity; - uint32_t bw_kb; - - /* resolve spurious clang shallow analysis null pointer errors */ - tor_assert(ri); - - uptimes[n_active] = (uint32_t)real_uptime(ri, now); - mtbfs[n_active] = rep_hist_get_stability(id, now); - tks [n_active] = rep_hist_get_weighted_time_known(id, now); - bandwidths_kb[n_active] = bw_kb = dirserv_get_credible_bandwidth_kb(ri); - if (!node->is_exit || node->is_bad_exit) { - bandwidths_excluding_exits_kb[n_active_nonexit] = bw_kb; - ++n_active_nonexit; - } - ++n_active; - } - } SMARTLIST_FOREACH_END(node); - - /* Now, compute thresholds. */ - if (n_active) { - /* The median uptime is stable. */ - stable_uptime = median_uint32(uptimes, n_active); - /* The median mtbf is stable, if we have enough mtbf info */ - stable_mtbf = median_double(mtbfs, n_active); - /* The 12.5th percentile bandwidth is fast. */ - fast_bandwidth_kb = find_nth_uint32(bandwidths_kb, n_active, n_active/8); - /* (Now bandwidths is sorted.) */ - if (fast_bandwidth_kb < RELAY_REQUIRED_MIN_BANDWIDTH/(2 * 1000)) - fast_bandwidth_kb = bandwidths_kb[n_active/4]; - guard_bandwidth_including_exits_kb = - third_quartile_uint32(bandwidths_kb, n_active); - guard_tk = find_nth_long(tks, n_active, n_active/8); - } - - if (guard_tk > TIME_KNOWN_TO_GUARANTEE_FAMILIAR) - guard_tk = TIME_KNOWN_TO_GUARANTEE_FAMILIAR; - - { - /* We can vote on a parameter for the minimum and maximum. */ -#define ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG 4 - int32_t min_fast_kb, max_fast_kb, min_fast, max_fast; - min_fast = networkstatus_get_param(NULL, "FastFlagMinThreshold", - ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG, - ABSOLUTE_MIN_VALUE_FOR_FAST_FLAG, - INT32_MAX); - if (options->TestingTorNetwork) { - min_fast = (int32_t)options->TestingMinFastFlagThreshold; - } - max_fast = networkstatus_get_param(NULL, "FastFlagMaxThreshold", - INT32_MAX, min_fast, INT32_MAX); - min_fast_kb = min_fast / 1000; - max_fast_kb = max_fast / 1000; - - if (fast_bandwidth_kb < (uint32_t)min_fast_kb) - fast_bandwidth_kb = min_fast_kb; - if (fast_bandwidth_kb > (uint32_t)max_fast_kb) - fast_bandwidth_kb = max_fast_kb; - } - /* Protect sufficiently fast nodes from being pushed out of the set - * of Fast nodes. */ - if (options->AuthDirFastGuarantee && - fast_bandwidth_kb > options->AuthDirFastGuarantee/1000) - fast_bandwidth_kb = (uint32_t)options->AuthDirFastGuarantee/1000; - - /* Now that we have a time-known that 7/8 routers are known longer than, - * fill wfus with the wfu of every such "familiar" router. */ - n_familiar = 0; - - SMARTLIST_FOREACH_BEGIN(nodelist, node_t *, node) { - if (router_counts_toward_thresholds(node, now, - omit_as_sybil, require_mbw)) { - routerinfo_t *ri = node->ri; - const char *id = ri->cache_info.identity_digest; - long tk = rep_hist_get_weighted_time_known(id, now); - if (tk < guard_tk) - continue; - wfus[n_familiar++] = rep_hist_get_weighted_fractional_uptime(id, now); - } - } SMARTLIST_FOREACH_END(node); - if (n_familiar) - guard_wfu = median_double(wfus, n_familiar); - if (guard_wfu > WFU_TO_GUARANTEE_GUARD) - guard_wfu = WFU_TO_GUARANTEE_GUARD; - - enough_mtbf_info = rep_hist_have_measured_enough_stability(); - - if (n_active_nonexit) { - guard_bandwidth_excluding_exits_kb = - find_nth_uint32(bandwidths_excluding_exits_kb, - n_active_nonexit, n_active_nonexit*3/4); - } - - log_info(LD_DIRSERV, - "Cutoffs: For Stable, %lu sec uptime, %lu sec MTBF. " - "For Fast: %lu kilobytes/sec. " - "For Guard: WFU %.03f%%, time-known %lu sec, " - "and bandwidth %lu or %lu kilobytes/sec. " - "We%s have enough stability data.", - (unsigned long)stable_uptime, - (unsigned long)stable_mtbf, - (unsigned long)fast_bandwidth_kb, - guard_wfu*100, - (unsigned long)guard_tk, - (unsigned long)guard_bandwidth_including_exits_kb, - (unsigned long)guard_bandwidth_excluding_exits_kb, - enough_mtbf_info ? "" : " don't"); - - tor_free(uptimes); - tor_free(mtbfs); - tor_free(bandwidths_kb); - tor_free(bandwidths_excluding_exits_kb); - tor_free(tks); - tor_free(wfus); -} - -/* Use dirserv_compute_performance_thresholds() to compute the thresholds - * for the status flags, specifically for bridges. - * - * This is only called by a Bridge Authority from - * networkstatus_getinfo_by_purpose(). - */ -void -dirserv_compute_bridge_flag_thresholds(void) -{ - digestmap_t *omit_as_sybil = digestmap_new(); - dirserv_compute_performance_thresholds(omit_as_sybil); - digestmap_free(omit_as_sybil, NULL); -} - -/** Measured bandwidth cache entry */ -typedef struct mbw_cache_entry_s { - long mbw_kb; - time_t as_of; -} mbw_cache_entry_t; - -/** Measured bandwidth cache - keys are identity_digests, values are - * mbw_cache_entry_t *. */ -static digestmap_t *mbw_cache = NULL; - -/** Store a measured bandwidth cache entry when reading the measured - * bandwidths file. */ -STATIC void -dirserv_cache_measured_bw(const measured_bw_line_t *parsed_line, - time_t as_of) -{ - mbw_cache_entry_t *e = NULL; - - tor_assert(parsed_line); - - /* Allocate a cache if we need */ - if (!mbw_cache) mbw_cache = digestmap_new(); - - /* Check if we have an existing entry */ - e = digestmap_get(mbw_cache, parsed_line->node_id); - /* If we do, we can re-use it */ - if (e) { - /* Check that we really are newer, and update */ - if (as_of > e->as_of) { - e->mbw_kb = parsed_line->bw_kb; - e->as_of = as_of; - } - } else { - /* We'll have to insert a new entry */ - e = tor_malloc(sizeof(*e)); - e->mbw_kb = parsed_line->bw_kb; - e->as_of = as_of; - digestmap_set(mbw_cache, parsed_line->node_id, e); - } -} - -/** Clear and free the measured bandwidth cache */ -void -dirserv_clear_measured_bw_cache(void) -{ - if (mbw_cache) { - /* Free the map and all entries */ - digestmap_free(mbw_cache, tor_free_); - mbw_cache = NULL; - } -} - -/** Scan the measured bandwidth cache and remove expired entries */ -STATIC void -dirserv_expire_measured_bw_cache(time_t now) -{ - - if (mbw_cache) { - /* Iterate through the cache and check each entry */ - DIGESTMAP_FOREACH_MODIFY(mbw_cache, k, mbw_cache_entry_t *, e) { - if (now > e->as_of + MAX_MEASUREMENT_AGE) { - tor_free(e); - MAP_DEL_CURRENT(k); - } - } DIGESTMAP_FOREACH_END; - - /* Check if we cleared the whole thing and free if so */ - if (digestmap_size(mbw_cache) == 0) { - digestmap_free(mbw_cache, tor_free_); - mbw_cache = 0; - } - } -} - -/** Query the cache by identity digest, return value indicates whether - * we found it. The bw_out and as_of_out pointers receive the cached - * bandwidth value and the time it was cached if not NULL. */ -int -dirserv_query_measured_bw_cache_kb(const char *node_id, long *bw_kb_out, - time_t *as_of_out) -{ - mbw_cache_entry_t *v = NULL; - int rv = 0; - - if (mbw_cache && node_id) { - v = digestmap_get(mbw_cache, node_id); - if (v) { - /* Found something */ - rv = 1; - if (bw_kb_out) *bw_kb_out = v->mbw_kb; - if (as_of_out) *as_of_out = v->as_of; - } - } - - return rv; -} - -/** Predicate wrapper for dirserv_query_measured_bw_cache() */ -int -dirserv_has_measured_bw(const char *node_id) -{ - return dirserv_query_measured_bw_cache_kb(node_id, NULL, NULL); -} - -/** Get the current size of the measured bandwidth cache */ -int -dirserv_get_measured_bw_cache_size(void) -{ - if (mbw_cache) return digestmap_size(mbw_cache); - else return 0; -} - -/** Return the bandwidth we believe for assigning flags; prefer measured - * over advertised, and if we have above a threshold quantity of measured - * bandwidths, we don't want to ever give flags to unmeasured routers, so - * return 0. */ -static uint32_t -dirserv_get_credible_bandwidth_kb(const routerinfo_t *ri) -{ - int threshold; - uint32_t bw_kb = 0; - long mbw_kb; - - tor_assert(ri); - /* Check if we have a measured bandwidth, and check the threshold if not */ - if (!(dirserv_query_measured_bw_cache_kb(ri->cache_info.identity_digest, - &mbw_kb, NULL))) { - threshold = get_options()->MinMeasuredBWsForAuthToIgnoreAdvertised; - if (routers_with_measured_bw > threshold) { - /* Return zero for unmeasured bandwidth if we are above threshold */ - bw_kb = 0; - } else { - /* Return an advertised bandwidth otherwise */ - bw_kb = router_get_advertised_bandwidth_capped(ri) / 1000; - } - } else { - /* We have the measured bandwidth in mbw */ - bw_kb = (uint32_t)mbw_kb; - } - - return bw_kb; -} - -/** Give a statement of our current performance thresholds for inclusion - * in a vote document. */ -char * -dirserv_get_flag_thresholds_line(void) -{ - char *result=NULL; - const int measured_threshold = - get_options()->MinMeasuredBWsForAuthToIgnoreAdvertised; - const int enough_measured_bw = routers_with_measured_bw > measured_threshold; - - tor_asprintf(&result, - "stable-uptime=%lu stable-mtbf=%lu " - "fast-speed=%lu " - "guard-wfu=%.03f%% guard-tk=%lu " - "guard-bw-inc-exits=%lu guard-bw-exc-exits=%lu " - "enough-mtbf=%d ignoring-advertised-bws=%d", - (unsigned long)stable_uptime, - (unsigned long)stable_mtbf, - (unsigned long)fast_bandwidth_kb*1000, - guard_wfu*100, - (unsigned long)guard_tk, - (unsigned long)guard_bandwidth_including_exits_kb*1000, - (unsigned long)guard_bandwidth_excluding_exits_kb*1000, - enough_mtbf_info ? 1 : 0, - enough_measured_bw ? 1 : 0); - - return result; -} - -/** Helper: write the router-status information in rs into a newly - * allocated character buffer. Use the same format as in network-status - * documents. If version is non-NULL, add a "v" line for the platform. - * - * consensus_method is the current consensus method when format is - * NS_V3_CONSENSUS or NS_V3_CONSENSUS_MICRODESC. It is ignored for other - * formats: pass ROUTERSTATUS_FORMAT_NO_CONSENSUS_METHOD. - * - * Return 0 on success, -1 on failure. - * - * The format argument has one of the following values: - * NS_V2 - Output an entry suitable for a V2 NS opinion document - * NS_V3_CONSENSUS - Output the first portion of a V3 NS consensus entry - * for consensus_method. - * NS_V3_CONSENSUS_MICRODESC - Output the first portion of a V3 microdesc - * consensus entry for consensus_method. - * NS_V3_VOTE - Output a complete V3 NS vote. If vrs is present, - * it contains additional information for the vote. - * NS_CONTROL_PORT - Output a NS document for the control port. - */ -char * -routerstatus_format_entry(const routerstatus_t *rs, const char *version, - const char *protocols, - routerstatus_format_type_t format, - int consensus_method, - const vote_routerstatus_t *vrs) -{ - char *summary; - char *result = NULL; - - char published[ISO_TIME_LEN+1]; - char identity64[BASE64_DIGEST_LEN+1]; - char digest64[BASE64_DIGEST_LEN+1]; - smartlist_t *chunks = smartlist_new(); - - format_iso_time(published, rs->published_on); - digest_to_base64(identity64, rs->identity_digest); - digest_to_base64(digest64, rs->descriptor_digest); - - smartlist_add_asprintf(chunks, - "r %s %s %s%s%s %s %d %d\n", - rs->nickname, - identity64, - (format==NS_V3_CONSENSUS_MICRODESC)?"":digest64, - (format==NS_V3_CONSENSUS_MICRODESC)?"":" ", - published, - fmt_addr32(rs->addr), - (int)rs->or_port, - (int)rs->dir_port); - - /* TODO: Maybe we want to pass in what we need to build the rest of - * this here, instead of in the caller. Then we could use the - * networkstatus_type_t values, with an additional control port value - * added -MP */ - - /* V3 microdesc consensuses only have "a" lines in later consensus methods - */ - if (format == NS_V3_CONSENSUS_MICRODESC && - consensus_method < MIN_METHOD_FOR_A_LINES_IN_MICRODESC_CONSENSUS) - goto done; - - /* Possible "a" line. At most one for now. */ - if (!tor_addr_is_null(&rs->ipv6_addr)) { - smartlist_add_asprintf(chunks, "a %s\n", - fmt_addrport(&rs->ipv6_addr, rs->ipv6_orport)); - } - - if (format == NS_V3_CONSENSUS || format == NS_V3_CONSENSUS_MICRODESC) - goto done; - - smartlist_add_asprintf(chunks, - "s%s%s%s%s%s%s%s%s%s%s\n", - /* These must stay in alphabetical order. */ - rs->is_authority?" Authority":"", - rs->is_bad_exit?" BadExit":"", - rs->is_exit?" Exit":"", - rs->is_fast?" Fast":"", - rs->is_possible_guard?" Guard":"", - rs->is_hs_dir?" HSDir":"", - rs->is_flagged_running?" Running":"", - rs->is_stable?" Stable":"", - rs->is_v2_dir?" V2Dir":"", - rs->is_valid?" Valid":""); - - /* length of "opt v \n" */ -#define V_LINE_OVERHEAD 7 - if (version && strlen(version) < MAX_V_LINE_LEN - V_LINE_OVERHEAD) { - smartlist_add_asprintf(chunks, "v %s\n", version); - } - if (protocols) { - smartlist_add_asprintf(chunks, "pr %s\n", protocols); - } - - if (format != NS_V2) { - const routerinfo_t* desc = router_get_by_id_digest(rs->identity_digest); - uint32_t bw_kb; - - if (format != NS_CONTROL_PORT) { - /* Blow up more or less nicely if we didn't get anything or not the - * thing we expected. - */ - if (!desc) { - char id[HEX_DIGEST_LEN+1]; - char dd[HEX_DIGEST_LEN+1]; - - base16_encode(id, sizeof(id), rs->identity_digest, DIGEST_LEN); - base16_encode(dd, sizeof(dd), rs->descriptor_digest, DIGEST_LEN); - log_warn(LD_BUG, "Cannot get any descriptor for %s " - "(wanted descriptor %s).", - id, dd); - goto err; - } - - /* This assert could fire for the control port, because - * it can request NS documents before all descriptors - * have been fetched. Therefore, we only do this test when - * format != NS_CONTROL_PORT. */ - if (tor_memneq(desc->cache_info.signed_descriptor_digest, - rs->descriptor_digest, - DIGEST_LEN)) { - char rl_d[HEX_DIGEST_LEN+1]; - char rs_d[HEX_DIGEST_LEN+1]; - char id[HEX_DIGEST_LEN+1]; - - base16_encode(rl_d, sizeof(rl_d), - desc->cache_info.signed_descriptor_digest, DIGEST_LEN); - base16_encode(rs_d, sizeof(rs_d), rs->descriptor_digest, DIGEST_LEN); - base16_encode(id, sizeof(id), rs->identity_digest, DIGEST_LEN); - log_err(LD_BUG, "descriptor digest in routerlist does not match " - "the one in routerstatus: %s vs %s " - "(router %s)\n", - rl_d, rs_d, id); - - tor_assert(tor_memeq(desc->cache_info.signed_descriptor_digest, - rs->descriptor_digest, - DIGEST_LEN)); - } - } - - if (format == NS_CONTROL_PORT && rs->has_bandwidth) { - bw_kb = rs->bandwidth_kb; - } else { - tor_assert(desc); - bw_kb = router_get_advertised_bandwidth_capped(desc) / 1000; - } - smartlist_add_asprintf(chunks, - "w Bandwidth=%d", bw_kb); - - if (format == NS_V3_VOTE && vrs && vrs->has_measured_bw) { - smartlist_add_asprintf(chunks, - " Measured=%d", vrs->measured_bw_kb); - } - /* Write down guardfraction information if we have it. */ - if (format == NS_V3_VOTE && vrs && vrs->status.has_guardfraction) { - smartlist_add_asprintf(chunks, - " GuardFraction=%d", - vrs->status.guardfraction_percentage); - } - - smartlist_add_strdup(chunks, "\n"); - - if (desc) { - summary = policy_summarize(desc->exit_policy, AF_INET); - smartlist_add_asprintf(chunks, "p %s\n", summary); - tor_free(summary); - } - - if (format == NS_V3_VOTE && vrs) { - if (tor_mem_is_zero((char*)vrs->ed25519_id, ED25519_PUBKEY_LEN)) { - smartlist_add_strdup(chunks, "id ed25519 none\n"); - } else { - char ed_b64[BASE64_DIGEST256_LEN+1]; - digest256_to_base64(ed_b64, (const char*)vrs->ed25519_id); - smartlist_add_asprintf(chunks, "id ed25519 %s\n", ed_b64); - } - } - } - - done: - result = smartlist_join_strings(chunks, "", 0, NULL); - - err: - SMARTLIST_FOREACH(chunks, char *, cp, tor_free(cp)); - smartlist_free(chunks); - - return result; -} - -/** Extract status information from ri and from other authority - * functions and store it in rs. rs is zeroed out before it is - * set. - * - * We assume that ri-\>is_running has already been set, e.g. by - * dirserv_set_router_is_running(ri, now); - */ -void -set_routerstatus_from_routerinfo(routerstatus_t *rs, - node_t *node, - routerinfo_t *ri, - time_t now, - int listbadexits) -{ - const or_options_t *options = get_options(); - uint32_t routerbw_kb = dirserv_get_credible_bandwidth_kb(ri); - - memset(rs, 0, sizeof(routerstatus_t)); - - rs->is_authority = - router_digest_is_trusted_dir(ri->cache_info.identity_digest); - - /* Already set by compute_performance_thresholds. */ - rs->is_exit = node->is_exit; - rs->is_stable = node->is_stable = - !dirserv_thinks_router_is_unreliable(now, ri, 1, 0); - rs->is_fast = node->is_fast = - !dirserv_thinks_router_is_unreliable(now, ri, 0, 1); - rs->is_flagged_running = node->is_running; /* computed above */ - - rs->is_valid = node->is_valid; - - if (node->is_fast && node->is_stable && - ri->supports_tunnelled_dir_requests && - ((options->AuthDirGuardBWGuarantee && - routerbw_kb >= options->AuthDirGuardBWGuarantee/1000) || - routerbw_kb >= MIN(guard_bandwidth_including_exits_kb, - guard_bandwidth_excluding_exits_kb))) { - long tk = rep_hist_get_weighted_time_known( - node->identity, now); - double wfu = rep_hist_get_weighted_fractional_uptime( - node->identity, now); - rs->is_possible_guard = (wfu >= guard_wfu && tk >= guard_tk) ? 1 : 0; - } else { - rs->is_possible_guard = 0; - } - - rs->is_bad_exit = listbadexits && node->is_bad_exit; - rs->is_hs_dir = node->is_hs_dir = - dirserv_thinks_router_is_hs_dir(ri, node, now); - - rs->is_named = rs->is_unnamed = 0; - - rs->published_on = ri->cache_info.published_on; - memcpy(rs->identity_digest, node->identity, DIGEST_LEN); - memcpy(rs->descriptor_digest, ri->cache_info.signed_descriptor_digest, - DIGEST_LEN); - rs->addr = ri->addr; - strlcpy(rs->nickname, ri->nickname, sizeof(rs->nickname)); - rs->or_port = ri->or_port; - rs->dir_port = ri->dir_port; - rs->is_v2_dir = ri->supports_tunnelled_dir_requests; - if (options->AuthDirHasIPv6Connectivity == 1 && - !tor_addr_is_null(&ri->ipv6_addr) && - node->last_reachable6 >= now - REACHABLE_TIMEOUT) { - /* We're configured as having IPv6 connectivity. There's an IPv6 - OR port and it's reachable so copy it to the routerstatus. */ - tor_addr_copy(&rs->ipv6_addr, &ri->ipv6_addr); - rs->ipv6_orport = ri->ipv6_orport; - } else { - tor_addr_make_null(&rs->ipv6_addr, AF_INET6); - rs->ipv6_orport = 0; - } - - if (options->TestingTorNetwork) { - dirserv_set_routerstatus_testing(rs); - } -} - -/** Use TestingDirAuthVoteExit, TestingDirAuthVoteGuard, and - * TestingDirAuthVoteHSDir to give out the Exit, Guard, and HSDir flags, - * respectively. But don't set the corresponding node flags. - * Should only be called if TestingTorNetwork is set. */ -STATIC void -dirserv_set_routerstatus_testing(routerstatus_t *rs) -{ - const or_options_t *options = get_options(); - - tor_assert(options->TestingTorNetwork); - - if (routerset_contains_routerstatus(options->TestingDirAuthVoteExit, - rs, 0)) { - rs->is_exit = 1; - } else if (options->TestingDirAuthVoteExitIsStrict) { - rs->is_exit = 0; - } - - if (routerset_contains_routerstatus(options->TestingDirAuthVoteGuard, - rs, 0)) { - rs->is_possible_guard = 1; - } else if (options->TestingDirAuthVoteGuardIsStrict) { - rs->is_possible_guard = 0; - } - - if (routerset_contains_routerstatus(options->TestingDirAuthVoteHSDir, - rs, 0)) { - rs->is_hs_dir = 1; - } else if (options->TestingDirAuthVoteHSDirIsStrict) { - rs->is_hs_dir = 0; - } -} - -/** The guardfraction of the guard with identity fingerprint guard_id - * is guardfraction_percentage. See if we have a vote routerstatus for - * this guard in vote_routerstatuses, and if we do, register the - * information to it. - * - * Return 1 if we applied the information and 0 if we couldn't find a - * matching guard. - * - * Requires that vote_routerstatuses be sorted. - */ -static int -guardfraction_line_apply(const char *guard_id, - uint32_t guardfraction_percentage, - smartlist_t *vote_routerstatuses) -{ - vote_routerstatus_t *vrs = NULL; - - tor_assert(vote_routerstatuses); - - vrs = smartlist_bsearch(vote_routerstatuses, guard_id, - compare_digest_to_vote_routerstatus_entry); - - if (!vrs) { - return 0; - } - - vrs->status.has_guardfraction = 1; - vrs->status.guardfraction_percentage = guardfraction_percentage; - - return 1; -} - -/* Given a guard line from a guardfraction file, parse it and register - * its information to vote_routerstatuses. - * - * Return: - * * 1 if the line was proper and its information got registered. - * * 0 if the line was proper but no currently active guard was found - * to register the guardfraction information to. - * * -1 if the line could not be parsed and set err_msg to a - newly allocated string containing the error message. - */ -static int -guardfraction_file_parse_guard_line(const char *guard_line, - smartlist_t *vote_routerstatuses, - char **err_msg) -{ - char guard_id[DIGEST_LEN]; - uint32_t guardfraction; - char *inputs_tmp = NULL; - int num_ok = 1; - - smartlist_t *sl = smartlist_new(); - int retval = -1; - - tor_assert(err_msg); - - /* guard_line should contain something like this: - <hex digest> <guardfraction> <appearances> */ - smartlist_split_string(sl, guard_line, " ", - SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 3); - if (smartlist_len(sl) < 3) { - tor_asprintf(err_msg, "bad line '%s'", guard_line); - goto done; - } - - inputs_tmp = smartlist_get(sl, 0); - if (strlen(inputs_tmp) != HEX_DIGEST_LEN || - base16_decode(guard_id, DIGEST_LEN, - inputs_tmp, HEX_DIGEST_LEN) != DIGEST_LEN) { - tor_asprintf(err_msg, "bad digest '%s'", inputs_tmp); - goto done; - } - - inputs_tmp = smartlist_get(sl, 1); - /* Guardfraction is an integer in [0, 100]. */ - guardfraction = - (uint32_t) tor_parse_long(inputs_tmp, 10, 0, 100, &num_ok, NULL); - if (!num_ok) { - tor_asprintf(err_msg, "wrong percentage '%s'", inputs_tmp); - goto done; - } - - /* If routerstatuses were provided, apply this info to actual routers. */ - if (vote_routerstatuses) { - retval = guardfraction_line_apply(guard_id, guardfraction, - vote_routerstatuses); - } else { - retval = 0; /* If we got this far, line was correctly formatted. */ - } - - done: - - SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); - smartlist_free(sl); - - return retval; -} - -/** Given an inputs line from a guardfraction file, parse it and - * register its information to total_consensuses and - * total_days. - * - * Return 0 if it parsed well. Return -1 if there was an error, and - * set err_msg to a newly allocated string containing the - * error message. - */ -static int -guardfraction_file_parse_inputs_line(const char *inputs_line, - int *total_consensuses, - int *total_days, - char **err_msg) -{ - int retval = -1; - char *inputs_tmp = NULL; - int num_ok = 1; - smartlist_t *sl = smartlist_new(); - - tor_assert(err_msg); - - /* Second line is inputs information: - * n-inputs <total_consensuses> <total_days>. */ - smartlist_split_string(sl, inputs_line, " ", - SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 3); - if (smartlist_len(sl) < 2) { - tor_asprintf(err_msg, "incomplete line '%s'", inputs_line); - goto done; - } - - inputs_tmp = smartlist_get(sl, 0); - *total_consensuses = - (int) tor_parse_long(inputs_tmp, 10, 0, INT_MAX, &num_ok, NULL); - if (!num_ok) { - tor_asprintf(err_msg, "unparseable consensus '%s'", inputs_tmp); - goto done; - } - - inputs_tmp = smartlist_get(sl, 1); - *total_days = - (int) tor_parse_long(inputs_tmp, 10, 0, INT_MAX, &num_ok, NULL); - if (!num_ok) { - tor_asprintf(err_msg, "unparseable days '%s'", inputs_tmp); - goto done; - } - - retval = 0; - - done: - SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); - smartlist_free(sl); - - return retval; -} - -/* Maximum age of a guardfraction file that we are willing to accept. */ -#define MAX_GUARDFRACTION_FILE_AGE (7*24*60*60) /* approx a week */ - -/** Static strings of guardfraction files. */ -#define GUARDFRACTION_DATE_STR "written-at" -#define GUARDFRACTION_INPUTS "n-inputs" -#define GUARDFRACTION_GUARD "guard-seen" -#define GUARDFRACTION_VERSION "guardfraction-file-version" - -/** Given a guardfraction file in a string, parse it and register the - * guardfraction information to the provided vote routerstatuses. - * - * This is the rough format of the guardfraction file: - * - * guardfraction-file-version 1 - * written-at <date and time> - * n-inputs <number of consesuses parsed> <number of days considered> - * - * guard-seen <fpr 1> <guardfraction percentage> <consensus appearances> - * guard-seen <fpr 2> <guardfraction percentage> <consensus appearances> - * guard-seen <fpr 3> <guardfraction percentage> <consensus appearances> - * guard-seen <fpr 4> <guardfraction percentage> <consensus appearances> - * guard-seen <fpr 5> <guardfraction percentage> <consensus appearances> - * ... - * - * Return -1 if the parsing failed and 0 if it went smoothly. Parsing - * should tolerate errors in all lines but the written-at header. - */ -STATIC int -dirserv_read_guardfraction_file_from_str(const char *guardfraction_file_str, - smartlist_t *vote_routerstatuses) -{ - config_line_t *front=NULL, *line; - int ret_tmp; - int retval = -1; - int current_line_n = 0; /* line counter for better log messages */ - - /* Guardfraction info to be parsed */ - int total_consensuses = 0; - int total_days = 0; - - /* Stats */ - int guards_read_n = 0; - int guards_applied_n = 0; - - /* Parse file and split it in lines */ - ret_tmp = config_get_lines(guardfraction_file_str, &front, 0); - if (ret_tmp < 0) { - log_warn(LD_CONFIG, "Error reading from guardfraction file"); - goto done; - } - - /* Sort routerstatuses (needed later when applying guardfraction info) */ - if (vote_routerstatuses) - smartlist_sort(vote_routerstatuses, compare_vote_routerstatus_entries); - - for (line = front; line; line=line->next) { - current_line_n++; - - if (!strcmp(line->key, GUARDFRACTION_VERSION)) { - int num_ok = 1; - unsigned int version; - - version = - (unsigned int) tor_parse_long(line->value, - 10, 0, INT_MAX, &num_ok, NULL); - - if (!num_ok || version != 1) { - log_warn(LD_GENERAL, "Got unknown guardfraction version %d.", version); - goto done; - } - } else if (!strcmp(line->key, GUARDFRACTION_DATE_STR)) { - time_t file_written_at; - time_t now = time(NULL); - - /* First line is 'written-at <date>' */ - if (parse_iso_time(line->value, &file_written_at) < 0) { - log_warn(LD_CONFIG, "Guardfraction:%d: Bad date '%s'. Ignoring", - current_line_n, line->value); - goto done; /* don't tolerate failure here. */ - } - if (file_written_at < now - MAX_GUARDFRACTION_FILE_AGE) { - log_warn(LD_CONFIG, "Guardfraction:%d: was written very long ago '%s'", - current_line_n, line->value); - goto done; /* don't tolerate failure here. */ - } - } else if (!strcmp(line->key, GUARDFRACTION_INPUTS)) { - char *err_msg = NULL; - - if (guardfraction_file_parse_inputs_line(line->value, - &total_consensuses, - &total_days, - &err_msg) < 0) { - log_warn(LD_CONFIG, "Guardfraction:%d: %s", - current_line_n, err_msg); - tor_free(err_msg); - continue; - } - - } else if (!strcmp(line->key, GUARDFRACTION_GUARD)) { - char *err_msg = NULL; - - ret_tmp = guardfraction_file_parse_guard_line(line->value, - vote_routerstatuses, - &err_msg); - if (ret_tmp < 0) { /* failed while parsing the guard line */ - log_warn(LD_CONFIG, "Guardfraction:%d: %s", - current_line_n, err_msg); - tor_free(err_msg); - continue; - } - - /* Successfully parsed guard line. Check if it was applied properly. */ - guards_read_n++; - if (ret_tmp > 0) { - guards_applied_n++; - } - } else { - log_warn(LD_CONFIG, "Unknown guardfraction line %d (%s %s)", - current_line_n, line->key, line->value); - } - } - - retval = 0; - - log_info(LD_CONFIG, - "Successfully parsed guardfraction file with %d consensuses over " - "%d days. Parsed %d nodes and applied %d of them%s.", - total_consensuses, total_days, guards_read_n, guards_applied_n, - vote_routerstatuses ? "" : " (no routerstatus provided)" ); - - done: - config_free_lines(front); - - if (retval < 0) { - return retval; - } else { - return guards_read_n; - } + return 1; } -/** Read a guardfraction file at fname and load all its - * information to vote_routerstatuses. */ +/** Return 1 if we should fetch new networkstatuses, descriptors, etc + * on the "mirror" schedule rather than the "client" schedule. + */ int -dirserv_read_guardfraction_file(const char *fname, - smartlist_t *vote_routerstatuses) +directory_fetches_dir_info_early(const or_options_t *options) { - char *guardfraction_file_str; - - /* Read file to a string */ - guardfraction_file_str = read_file_to_str(fname, RFTS_IGNORE_MISSING, NULL); - if (!guardfraction_file_str) { - log_warn(LD_FS, "Cannot open guardfraction file '%s'. Failing.", fname); - return -1; - } - - return dirserv_read_guardfraction_file_from_str(guardfraction_file_str, - vote_routerstatuses); + return directory_fetches_from_authorities(options); } -/** - * Helper function to parse out a line in the measured bandwidth file - * into a measured_bw_line_t output structure. - * - * If line_is_after_headers is true, then if we encounter an incomplete - * bw line, return -1 and warn, since we are after the headers and we should - * only parse bw lines. Return 0 otherwise. - * - * If line_is_after_headers is false then it means that we are not past - * the header block yet. If we encounter an incomplete bw line, return -1 but - * don't warn since there could be additional header lines coming. If we - * encounter a proper bw line, return 0 (and we got past the headers). +/** Return 1 if we should fetch new networkstatuses, descriptors, etc + * on a very passive schedule -- waiting long enough for ordinary clients + * to probably have the info we want. These would include bridge users, + * and maybe others in the future e.g. if a Tor client uses another Tor + * client as a directory guard. */ -STATIC int -measured_bw_line_parse(measured_bw_line_t *out, const char *orig_line, - int line_is_after_headers) +int +directory_fetches_dir_info_later(const or_options_t *options) { - char *line = tor_strdup(orig_line); - char *cp = line; - int got_bw = 0; - int got_node_id = 0; - char *strtok_state; /* lame sauce d'jour */ - - if (strlen(line) == 0) { - log_warn(LD_DIRSERV, "Empty line in bandwidth file"); - tor_free(line); - return -1; - } - - /* Remove end of line character, so that is not part of the token */ - if (line[strlen(line) - 1] == '\n') { - line[strlen(line) - 1] = '\0'; - } - - cp = tor_strtok_r(cp, " \t", &strtok_state); - - if (!cp) { - log_warn(LD_DIRSERV, "Invalid line in bandwidth file: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - - if (orig_line[strlen(orig_line)-1] != '\n') { - log_warn(LD_DIRSERV, "Incomplete line in bandwidth file: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - - do { - if (strcmpstart(cp, "bw=") == 0) { - int parse_ok = 0; - char *endptr; - if (got_bw) { - log_warn(LD_DIRSERV, "Double bw= in bandwidth file line: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - cp+=strlen("bw="); - - out->bw_kb = tor_parse_long(cp, 10, 0, LONG_MAX, &parse_ok, &endptr); - if (!parse_ok || (*endptr && !TOR_ISSPACE(*endptr))) { - log_warn(LD_DIRSERV, "Invalid bandwidth in bandwidth file line: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - got_bw=1; - } else if (strcmpstart(cp, "node_id=$") == 0) { - if (got_node_id) { - log_warn(LD_DIRSERV, "Double node_id= in bandwidth file line: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - cp+=strlen("node_id=$"); - - if (strlen(cp) != HEX_DIGEST_LEN || - base16_decode(out->node_id, DIGEST_LEN, - cp, HEX_DIGEST_LEN) != DIGEST_LEN) { - log_warn(LD_DIRSERV, "Invalid node_id in bandwidth file line: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } - strlcpy(out->node_hex, cp, sizeof(out->node_hex)); - got_node_id=1; - } - } while ((cp = tor_strtok_r(NULL, " \t", &strtok_state))); + return options->UseBridges != 0; +} - if (got_bw && got_node_id) { - tor_free(line); - return 0; - } else if (line_is_after_headers == 0) { - /* There could be additional header lines, therefore do not give warnings - * but returns -1 since it's not a complete bw line. */ - log_debug(LD_DIRSERV, "Missing bw or node_id in bandwidth file line: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } else { - log_warn(LD_DIRSERV, "Incomplete line in bandwidth file: %s", - escaped(orig_line)); - tor_free(line); - return -1; - } +/** Return true iff we want to serve certificates for authorities + * that we don't acknowledge as authorities ourself. + * Use we_want_to_fetch_unknown_auth_certs to check if we want to fetch + * and keep these certificates. + */ +int +directory_caches_unknown_auth_certs(const or_options_t *options) +{ + return dir_server_mode(options) || options->BridgeRelay; } -/** - * Helper function to apply a parsed measurement line to a list - * of bandwidth statuses. Returns true if a line is found, - * false otherwise. +/** Return 1 if we want to fetch and serve descriptors, networkstatuses, etc + * Else return 0. + * Check options->DirPort_set and directory_permits_begindir_requests() + * to see if we are willing to serve these directory documents to others via + * the DirPort and begindir-over-ORPort, respectively. + * + * To check if we should fetch documents, use we_want_to_fetch_flavor and + * we_want_to_fetch_unknown_auth_certs instead of this function. */ -STATIC int -measured_bw_line_apply(measured_bw_line_t *parsed_line, - smartlist_t *routerstatuses) +int +directory_caches_dir_info(const or_options_t *options) { - vote_routerstatus_t *rs = NULL; - if (!routerstatuses) + if (options->BridgeRelay || dir_server_mode(options)) + return 1; + if (!server_mode(options) || !advertised_server_mode()) return 0; + /* We need an up-to-date view of network info if we're going to try to + * block exit attempts from unknown relays. */ + return ! router_my_exit_policy_is_reject_star() && + should_refuse_unknown_exits(options); +} - rs = smartlist_bsearch(routerstatuses, parsed_line->node_id, - compare_digest_to_vote_routerstatus_entry); - - if (rs) { - rs->has_measured_bw = 1; - rs->measured_bw_kb = (uint32_t)parsed_line->bw_kb; - } else { - log_info(LD_DIRSERV, "Node ID %s not found in routerstatus list", - parsed_line->node_hex); - } - - return rs != NULL; +/** Return 1 if we want to allow remote clients to ask us directory + * requests via the "begin_dir" interface, which doesn't require + * having any separate port open. */ +int +directory_permits_begindir_requests(const or_options_t *options) +{ + return options->BridgeRelay != 0 || dir_server_mode(options); } -/** - * Read the measured bandwidth list file, apply it to the list of - * vote_routerstatus_t and store all the headers in bw_file_headers. - * Returns -1 on error, 0 otherwise. +/** Return 1 if we have no need to fetch new descriptors. This generally + * happens when we're not a dir cache and we haven't built any circuits + * lately. */ int -dirserv_read_measured_bandwidths(const char *from_file, - smartlist_t *routerstatuses, - smartlist_t *bw_file_headers) +directory_too_idle_to_fetch_descriptors(const or_options_t *options, + time_t now) { - FILE *fp = tor_fopen_cloexec(from_file, "r"); - int applied_lines = 0; - time_t file_time, now; - int ok; - /* This flag will be 1 only when the first successful bw measurement line - * has been encountered, so that measured_bw_line_parse don't give warnings - * if there are additional header lines, as introduced in Bandwidth List spec - * version 1.1.0 */ - int line_is_after_headers = 0; - int rv = -1; - char *line = NULL; - size_t n = 0; - - /* Initialise line, so that we can't possibly run off the end. */ - - if (fp == NULL) { - log_warn(LD_CONFIG, "Can't open bandwidth file at configured location: %s", - from_file); - goto err; - } + return !directory_caches_dir_info(options) && + !options->FetchUselessDescriptors && + rep_hist_circbuilding_dormant(now); +} - /* If fgets fails, line is either unmodified, or indeterminate. */ - if (tor_getline(&line,&n,fp) <= 0) { - log_warn(LD_DIRSERV, "Empty bandwidth file"); - goto err; - } +/********************************************************************/ - if (!strlen(line) || line[strlen(line)-1] != '\n') { - log_warn(LD_DIRSERV, "Long or truncated time in bandwidth file: %s", - escaped(line)); - goto err; - } +/** Map from flavor name to the cached_dir_t for the v3 consensuses that we're + * currently serving. */ +static strmap_t *cached_consensuses = NULL; - line[strlen(line)-1] = '\0'; - file_time = (time_t)tor_parse_ulong(line, 10, 0, ULONG_MAX, &ok, NULL); - if (!ok) { - log_warn(LD_DIRSERV, "Non-integer time in bandwidth file: %s", - escaped(line)); - goto err; - } +/** Decrement the reference count on d, and free it if it no longer has + * any references. */ +void +cached_dir_decref(cached_dir_t *d) +{ + if (!d || --d->refcnt > 0) + return; + clear_cached_dir(d); + tor_free(d); +} - now = time(NULL); - if ((now - file_time) > MAX_MEASUREMENT_AGE) { - log_warn(LD_DIRSERV, "Bandwidth measurement file stale. Age: %u", - (unsigned)(time(NULL) - file_time)); - goto err; +/** Allocate and return a new cached_dir_t containing the string s, + * published at published. */ +cached_dir_t * +new_cached_dir(char *s, time_t published) +{ + cached_dir_t *d = tor_malloc_zero(sizeof(cached_dir_t)); + d->refcnt = 1; + d->dir = s; + d->dir_len = strlen(s); + d->published = published; + if (tor_compress(&(d->dir_compressed), &(d->dir_compressed_len), + d->dir, d->dir_len, ZLIB_METHOD)) { + log_warn(LD_BUG, "Error compressing directory"); } + return d; +} - /* If timestamp was correct and bw_file_headers is not NULL, - * add timestamp to bw_file_headers */ - if (bw_file_headers) - smartlist_add_asprintf(bw_file_headers, "timestamp=%lu", - (unsigned long)file_time); - - if (routerstatuses) - smartlist_sort(routerstatuses, compare_vote_routerstatus_entries); - - while (!feof(fp)) { - measured_bw_line_t parsed_line; - if (tor_getline(&line, &n, fp) >= 0) { - if (measured_bw_line_parse(&parsed_line, line, - line_is_after_headers) != -1) { - /* This condition will be true when the first complete valid bw line - * has been encountered, which means the end of the header lines. */ - line_is_after_headers = 1; - /* Also cache the line for dirserv_get_bandwidth_for_router() */ - dirserv_cache_measured_bw(&parsed_line, file_time); - if (measured_bw_line_apply(&parsed_line, routerstatuses) > 0) - applied_lines++; - /* if the terminator is found, it is the end of header lines, set the - * flag but do not store anything */ - } else if (strcmp(line, BW_FILE_HEADERS_TERMINATOR) == 0) { - line_is_after_headers = 1; - /* if the line was not a correct relay line nor the terminator and - * the end of the header lines has not been detected yet - * and it is key_value and bw_file_headers did not reach the maximum - * number of headers, - * then assume this line is a header and add it to bw_file_headers */ - } else if (bw_file_headers && - (line_is_after_headers == 0) && - string_is_key_value(LOG_DEBUG, line) && - !strchr(line, ' ') && - (smartlist_len(bw_file_headers) - < MAX_BW_FILE_HEADER_COUNT_IN_VOTE)) { - line[strlen(line)-1] = '\0'; - smartlist_add_strdup(bw_file_headers, line); - }; - } - } +/** Remove all storage held in d, but do not free d itself. */ +static void +clear_cached_dir(cached_dir_t *d) +{ + tor_free(d->dir); + tor_free(d->dir_compressed); + memset(d, 0, sizeof(cached_dir_t)); +} - /* Now would be a nice time to clean the cache, too */ - dirserv_expire_measured_bw_cache(now); +/** Free all storage held by the cached_dir_t in d. */ +static void +free_cached_dir_(void *_d) +{ + cached_dir_t *d; + if (!_d) + return; - log_info(LD_DIRSERV, - "Bandwidth measurement file successfully read. " - "Applied %d measurements.", applied_lines); - rv = 0; + d = (cached_dir_t *)_d; + cached_dir_decref(d); +} - err: - if (line) { - // we need to raw_free this buffer because we got it from tor_getdelim() - raw_free(line); - } - if (fp) - fclose(fp); - return rv; +/** Replace the v3 consensus networkstatus of type flavor_name that + * we're serving with networkstatus, published at published. No + * validation is performed. */ +void +dirserv_set_cached_consensus_networkstatus(const char *networkstatus, ++ size_t networkstatus_len, + const char *flavor_name, + const common_digests_t *digests, + const uint8_t *sha3_as_signed, + time_t published) +{ + cached_dir_t *new_networkstatus; + cached_dir_t *old_networkstatus; + if (!cached_consensuses) + cached_consensuses = strmap_new(); + - new_networkstatus = new_cached_dir(tor_strdup(networkstatus), published); ++ new_networkstatus = ++ new_cached_dir(tor_memdup_nulterm(networkstatus, networkstatus_len), ++ published); + memcpy(&new_networkstatus->digests, digests, sizeof(common_digests_t)); + memcpy(&new_networkstatus->digest_sha3_as_signed, sha3_as_signed, + DIGEST256_LEN); + old_networkstatus = strmap_set(cached_consensuses, flavor_name, + new_networkstatus); + if (old_networkstatus) + cached_dir_decref(old_networkstatus); +} + +/** Return the latest downloaded consensus networkstatus in encoded, signed, + * optionally compressed format, suitable for sending to clients. */ +cached_dir_t * +dirserv_get_consensus(const char *flavor_name) +{ + if (!cached_consensuses) + return NULL; + return strmap_get(cached_consensuses, flavor_name); } /** As dirserv_get_routerdescs(), but instead of getting signed_descriptor_t diff --cc src/feature/dirparse/authcert_parse.c index 2ba46bb8f,000000000..334baf8b1 mode 100644,000000..100644 --- a/src/feature/dirparse/authcert_parse.c +++ b/src/feature/dirparse/authcert_parse.c @@@ -1,207 -1,0 +1,209 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2018, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +#include "core/or/or.h" +#include "feature/dirparse/authcert_parse.h" +#include "feature/dirparse/parsecommon.h" +#include "feature/dirparse/sigcommon.h" +#include "feature/dirparse/unparseable.h" +#include "feature/nodelist/authcert.h" +#include "lib/memarea/memarea.h" + +#include "feature/nodelist/authority_cert_st.h" + +/** List of tokens recognized in V3 authority certificates. */ +static token_rule_t dir_key_certificate_table[] = { +#include "feature/dirparse/authcert_members.i" + T1("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), + END_OF_TABLE +}; + +/** Parse a key certificate from s; point end-of-string to + * the first character after the certificate. */ +authority_cert_t * - authority_cert_parse_from_string(const char *s, const char **end_of_string) ++authority_cert_parse_from_string(const char *s, size_t maxlen, ++ const char **end_of_string) +{ + /** Reject any certificate at least this big; it is probably an overflow, an + * attack, a bug, or some other nonsense. */ +#define MAX_CERT_SIZE (128*1024) + + authority_cert_t *cert = NULL, *old_cert; + smartlist_t *tokens = NULL; + char digest[DIGEST_LEN]; + directory_token_t *tok; + char fp_declared[DIGEST_LEN]; - char *eos; ++ const char *eos; + size_t len; + int found; + memarea_t *area = NULL; ++ const char *end_of_s = s + maxlen; + const char *s_dup = s; + - s = eat_whitespace(s); - eos = strstr(s, "\ndir-key-certification"); ++ s = eat_whitespace_eos(s, end_of_s); ++ eos = tor_memstr(s, end_of_s - s, "\ndir-key-certification"); + if (! eos) { + log_warn(LD_DIR, "No signature found on key certificate"); + return NULL; + } - eos = strstr(eos, "\n-----END SIGNATURE-----\n"); ++ eos = tor_memstr(eos, end_of_s - eos, "\n-----END SIGNATURE-----\n"); + if (! eos) { + log_warn(LD_DIR, "No end-of-signature found on key certificate"); + return NULL; + } - eos = strchr(eos+2, '\n'); ++ eos = memchr(eos+2, '\n', end_of_s - (eos+2)); + tor_assert(eos); + ++eos; + len = eos - s; + + if (len > MAX_CERT_SIZE) { + log_warn(LD_DIR, "Certificate is far too big (at %lu bytes long); " + "rejecting", (unsigned long)len); + return NULL; + } + + tokens = smartlist_new(); + area = memarea_new(); + if (tokenize_string(area,s, eos, tokens, dir_key_certificate_table, 0) < 0) { + log_warn(LD_DIR, "Error tokenizing key certificate"); + goto err; + } - if (router_get_hash_impl(s, strlen(s), digest, "dir-key-certificate-version", ++ if (router_get_hash_impl(s, eos - s, digest, "dir-key-certificate-version", + "\ndir-key-certification", '\n', DIGEST_SHA1) < 0) + goto err; + tok = smartlist_get(tokens, 0); + if (tok->tp != K_DIR_KEY_CERTIFICATE_VERSION || strcmp(tok->args[0], "3")) { + log_warn(LD_DIR, + "Key certificate does not begin with a recognized version (3)."); + goto err; + } + + cert = tor_malloc_zero(sizeof(authority_cert_t)); + memcpy(cert->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); + + tok = find_by_keyword(tokens, K_DIR_SIGNING_KEY); + tor_assert(tok->key); + cert->signing_key = tok->key; + tok->key = NULL; + if (crypto_pk_get_digest(cert->signing_key, cert->signing_key_digest)) + goto err; + + tok = find_by_keyword(tokens, K_DIR_IDENTITY_KEY); + tor_assert(tok->key); + cert->identity_key = tok->key; + tok->key = NULL; + + tok = find_by_keyword(tokens, K_FINGERPRINT); + tor_assert(tok->n_args); + if (base16_decode(fp_declared, DIGEST_LEN, tok->args[0], + strlen(tok->args[0])) != DIGEST_LEN) { + log_warn(LD_DIR, "Couldn't decode key certificate fingerprint %s", + escaped(tok->args[0])); + goto err; + } + + if (crypto_pk_get_digest(cert->identity_key, + cert->cache_info.identity_digest)) + goto err; + + if (tor_memneq(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) { + log_warn(LD_DIR, "Digest of certificate key didn't match declared " + "fingerprint"); + goto err; + } + + tok = find_opt_by_keyword(tokens, K_DIR_ADDRESS); + if (tok) { + struct in_addr in; + char *address = NULL; + tor_assert(tok->n_args); + /* XXX++ use some tor_addr parse function below instead. -RD */ + if (tor_addr_port_split(LOG_WARN, tok->args[0], &address, + &cert->dir_port) < 0 || + tor_inet_aton(address, &in) == 0) { + log_warn(LD_DIR, "Couldn't parse dir-address in certificate"); + tor_free(address); + goto err; + } + cert->addr = ntohl(in.s_addr); + tor_free(address); + } + + tok = find_by_keyword(tokens, K_DIR_KEY_PUBLISHED); + if (parse_iso_time(tok->args[0], &cert->cache_info.published_on) < 0) { + goto err; + } + tok = find_by_keyword(tokens, K_DIR_KEY_EXPIRES); + if (parse_iso_time(tok->args[0], &cert->expires) < 0) { + goto err; + } + + tok = smartlist_get(tokens, smartlist_len(tokens)-1); + if (tok->tp != K_DIR_KEY_CERTIFICATION) { + log_warn(LD_DIR, "Certificate didn't end with dir-key-certification."); + goto err; + } + + /* If we already have this cert, don't bother checking the signature. */ + old_cert = authority_cert_get_by_digests( + cert->cache_info.identity_digest, + cert->signing_key_digest); + found = 0; + if (old_cert) { + /* XXXX We could just compare signed_descriptor_digest, but that wouldn't + * buy us much. */ + if (old_cert->cache_info.signed_descriptor_len == len && + old_cert->cache_info.signed_descriptor_body && + tor_memeq(s, old_cert->cache_info.signed_descriptor_body, len)) { + log_debug(LD_DIR, "We already checked the signature on this " + "certificate; no need to do so again."); + found = 1; + } + } + if (!found) { + if (check_signature_token(digest, DIGEST_LEN, tok, cert->identity_key, 0, + "key certificate")) { + goto err; + } + + tok = find_by_keyword(tokens, K_DIR_KEY_CROSSCERT); + if (check_signature_token(cert->cache_info.identity_digest, + DIGEST_LEN, + tok, + cert->signing_key, + CST_NO_CHECK_OBJTYPE, + "key cross-certification")) { + goto err; + } + } + + cert->cache_info.signed_descriptor_len = len; + cert->cache_info.signed_descriptor_body = tor_malloc(len+1); + memcpy(cert->cache_info.signed_descriptor_body, s, len); + cert->cache_info.signed_descriptor_body[len] = 0; + cert->cache_info.saved_location = SAVED_NOWHERE; + + if (end_of_string) { + *end_of_string = eat_whitespace(eos); + } + SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); + smartlist_free(tokens); + if (area) { + DUMP_AREA(area, "authority cert"); + memarea_drop_all(area); + } + return cert; + err: + dump_desc(s_dup, "authority cert"); + authority_cert_free(cert); + SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); + smartlist_free(tokens); + if (area) { + DUMP_AREA(area, "authority cert"); + memarea_drop_all(area); + } + return NULL; +} diff --cc src/feature/dirparse/authcert_parse.h index f63525e04,000000000..e4e9fec99 mode 100644,000000..100644 --- a/src/feature/dirparse/authcert_parse.h +++ b/src/feature/dirparse/authcert_parse.h @@@ -1,18 -1,0 +1,19 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2018, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file authcert_parse.h + * \brief Header file for authcert_parse.c. + **/ + +#ifndef TOR_AUTHCERT_PARSE_H +#define TOR_AUTHCERT_PARSE_H + +authority_cert_t *authority_cert_parse_from_string(const char *s, ++ size_t maxlen, + const char **end_of_string); + +#endif /* !defined(TOR_AUTHCERT_PARSE_H) */ diff --cc src/feature/dirparse/ns_parse.c index 72299e807,000000000..3fccec154 mode 100644,000000..100644 --- a/src/feature/dirparse/ns_parse.c +++ b/src/feature/dirparse/ns_parse.c @@@ -1,1685 -1,0 +1,1696 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2018, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file routerparse.c + * \brief Code to parse and validate consensus documents and votes. + */ + +#define NS_PARSE_PRIVATE + +#include "core/or/or.h" +#include "app/config/config.h" +#include "core/or/versions.h" +#include "feature/client/entrynodes.h" +#include "feature/dirauth/dirvote.h" +#include "feature/dirparse/authcert_parse.h" +#include "feature/dirparse/ns_parse.h" +#include "feature/dirparse/parsecommon.h" +#include "feature/dirparse/routerparse.h" +#include "feature/dirparse/sigcommon.h" +#include "feature/dirparse/unparseable.h" +#include "feature/hs_common/shared_random_client.h" +#include "feature/nodelist/authcert.h" +#include "feature/nodelist/describe.h" +#include "feature/nodelist/networkstatus.h" +#include "feature/nodelist/nickname.h" +#include "lib/crypt_ops/crypto_format.h" +#include "lib/memarea/memarea.h" + +#include "feature/dirauth/vote_microdesc_hash_st.h" +#include "feature/nodelist/authority_cert_st.h" +#include "feature/nodelist/document_signature_st.h" +#include "feature/nodelist/networkstatus_st.h" +#include "feature/nodelist/networkstatus_voter_info_st.h" +#include "feature/nodelist/vote_routerstatus_st.h" + +#undef log +#include <math.h> + +/** List of tokens recognized in the body part of v3 networkstatus + * documents. */ +static token_rule_t rtrstatus_token_table[] = { + T01("p", K_P, CONCAT_ARGS, NO_OBJ ), + T1( "r", K_R, GE(7), NO_OBJ ), + T0N("a", K_A, GE(1), NO_OBJ ), + T1( "s", K_S, ARGS, NO_OBJ ), + T01("v", K_V, CONCAT_ARGS, NO_OBJ ), + T01("w", K_W, ARGS, NO_OBJ ), + T0N("m", K_M, CONCAT_ARGS, NO_OBJ ), + T0N("id", K_ID, GE(2), NO_OBJ ), + T01("pr", K_PROTO, CONCAT_ARGS, NO_OBJ ), + T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), + END_OF_TABLE +}; + +/** List of tokens recognized in V3 networkstatus votes. */ +static token_rule_t networkstatus_token_table[] = { + T1_START("network-status-version", K_NETWORK_STATUS_VERSION, + GE(1), NO_OBJ ), + T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), + T1("published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), + T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), + T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), + T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), + T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), + T1("known-flags", K_KNOWN_FLAGS, ARGS, NO_OBJ ), + T01("params", K_PARAMS, ARGS, NO_OBJ ), + T( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), + T01("signing-ed25519", K_SIGNING_CERT_ED, NO_ARGS , NEED_OBJ ), + T01("shared-rand-participate",K_SR_FLAG, NO_ARGS, NO_OBJ ), + T0N("shared-rand-commit", K_COMMIT, GE(3), NO_OBJ ), + T01("shared-rand-previous-value", K_PREVIOUS_SRV,EQ(2), NO_OBJ ), + T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), + T0N("package", K_PACKAGE, CONCAT_ARGS, NO_OBJ ), + T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + +#include "feature/dirparse/authcert_members.i" + + T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), + T1( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), + T1( "dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), + T01("legacy-dir-key", K_LEGACY_DIR_KEY, GE(1), NO_OBJ ), + T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), + T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), + T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), + T1( "consensus-methods", K_CONSENSUS_METHODS, GE(1), NO_OBJ ), + + END_OF_TABLE +}; + +/** List of tokens recognized in V3 networkstatus consensuses. */ +static token_rule_t networkstatus_consensus_token_table[] = { + T1_START("network-status-version", K_NETWORK_STATUS_VERSION, + GE(1), NO_OBJ ), + T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), + T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), + T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), + T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), + T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), + + T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), + + T1N("dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), + T1N("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), + T1N("vote-digest", K_VOTE_DIGEST, GE(1), NO_OBJ ), + + T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), + + T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), + T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), + T01("consensus-method", K_CONSENSUS_METHOD, EQ(1), NO_OBJ), + T01("params", K_PARAMS, ARGS, NO_OBJ ), + + T01("shared-rand-previous-value", K_PREVIOUS_SRV, EQ(2), NO_OBJ ), + T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), + + T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, + CONCAT_ARGS, NO_OBJ ), + + END_OF_TABLE +}; + +/** List of tokens recognized in the footer of v1 directory footers. */ +static token_rule_t networkstatus_vote_footer_token_table[] = { + T01("directory-footer", K_DIRECTORY_FOOTER, NO_ARGS, NO_OBJ ), + T01("bandwidth-weights", K_BW_WEIGHTS, ARGS, NO_OBJ ), + T( "directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ), + END_OF_TABLE +}; + +/** Try to find the start and end of the signed portion of a networkstatus + * document in s. On success, set start_out to the first + * character of the document, and end_out to a position one after the + * final character of the signed document, and return 0. On failure, return + * -1. */ +int +router_get_networkstatus_v3_signed_boundaries(const char *s, ++ size_t len, + const char **start_out, + const char **end_out) +{ - return router_get_hash_impl_helper(s, strlen(s), ++ return router_get_hash_impl_helper(s, len, + "network-status-version", + "\ndirectory-signature", + ' ', LOG_INFO, + start_out, end_out); +} + +/** Set digest_out to the SHA3-256 digest of the signed portion of the + * networkstatus vote in s -- or of the entirety of s if no + * signed portion can be identified. Return 0 on success, -1 on failure. */ +int +router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, - const char *s) ++ const char *s, size_t len) +{ + const char *start, *end; - if (router_get_networkstatus_v3_signed_boundaries(s, &start, &end) < 0) { ++ if (router_get_networkstatus_v3_signed_boundaries(s, len, ++ &start, &end) < 0) { + start = s; - end = s + strlen(s); ++ end = s + len; + } + tor_assert(start); + tor_assert(end); + return crypto_digest256((char*)digest_out, start, end-start, + DIGEST_SHA3_256); +} + +/** Set digests to all the digests of the consensus document in + * s */ +int - router_get_networkstatus_v3_hashes(const char *s, common_digests_t *digests) ++router_get_networkstatus_v3_hashes(const char *s, size_t len, ++ common_digests_t *digests) +{ - return router_get_hashes_impl(s,strlen(s),digests, ++ return router_get_hashes_impl(s, len, digests, + "network-status-version", + "\ndirectory-signature", + ' '); +} + +/** Helper: given a string s, return the start of the next router-status + * object (starting with "r " at the start of a line). If none is found, + * return the start of the directory footer, or the next directory signature. + * If none is found, return the end of the string. */ +static inline const char * - find_start_of_next_routerstatus(const char *s) ++find_start_of_next_routerstatus(const char *s, const char *s_eos) +{ + const char *eos, *footer, *sig; - if ((eos = strstr(s, "\nr "))) ++ if ((eos = tor_memstr(s, s_eos - s, "\nr "))) + ++eos; + else - eos = s + strlen(s); ++ eos = s_eos; + + footer = tor_memstr(s, eos-s, "\ndirectory-footer"); + sig = tor_memstr(s, eos-s, "\ndirectory-signature"); + + if (footer && sig) + return MIN(footer, sig) + 1; + else if (footer) + return footer+1; + else if (sig) + return sig+1; + else + return eos; +} + +/** Parse the GuardFraction string from a consensus or vote. + * + * If vote or vote_rs are set the document getting + * parsed is a vote routerstatus. Otherwise it's a consensus. This is + * the same semantic as in routerstatus_parse_entry_from_string(). */ +STATIC int +routerstatus_parse_guardfraction(const char *guardfraction_str, + networkstatus_t *vote, + vote_routerstatus_t *vote_rs, + routerstatus_t *rs) +{ + int ok; + const char *end_of_header = NULL; + int is_consensus = !vote_rs; + uint32_t guardfraction; + + tor_assert(bool_eq(vote, vote_rs)); + + /* If this info comes from a consensus, but we should't apply + guardfraction, just exit. */ + if (is_consensus && !should_apply_guardfraction(NULL)) { + return 0; + } + + end_of_header = strchr(guardfraction_str, '='); + if (!end_of_header) { + return -1; + } + + guardfraction = (uint32_t)tor_parse_ulong(end_of_header+1, + 10, 0, 100, &ok, NULL); + if (!ok) { + log_warn(LD_DIR, "Invalid GuardFraction %s", escaped(guardfraction_str)); + return -1; + } + + log_debug(LD_GENERAL, "[*] Parsed %s guardfraction '%s' for '%s'.", + is_consensus ? "consensus" : "vote", + guardfraction_str, rs->nickname); + + if (!is_consensus) { /* We are parsing a vote */ + vote_rs->status.guardfraction_percentage = guardfraction; + vote_rs->status.has_guardfraction = 1; + } else { + /* We are parsing a consensus. Only apply guardfraction to guards. */ + if (rs->is_possible_guard) { + rs->guardfraction_percentage = guardfraction; + rs->has_guardfraction = 1; + } else { + log_warn(LD_BUG, "Got GuardFraction for non-guard %s. " + "This is not supposed to happen. Not applying. ", rs->nickname); + } + } + + return 0; +} + +/** Given a string at *s, containing a routerstatus object, and an + * empty smartlist at tokens, parse and return the first router status + * object in the string, and advance *s to just after the end of the + * router status. Return NULL and advance *s on error. + * + * If vote and vote_rs are provided, don't allocate a fresh + * routerstatus but use vote_rs instead. + * + * If consensus_method is nonzero, this routerstatus is part of a + * consensus, and we should parse it according to the method used to + * make that consensus. + * + * Parse according to the syntax used by the consensus flavor flav. + **/ +STATIC routerstatus_t * +routerstatus_parse_entry_from_string(memarea_t *area, - const char **s, smartlist_t *tokens, ++ const char **s, const char *s_eos, ++ smartlist_t *tokens, + networkstatus_t *vote, + vote_routerstatus_t *vote_rs, + int consensus_method, + consensus_flavor_t flav) +{ + const char *eos, *s_dup = *s; + routerstatus_t *rs = NULL; + directory_token_t *tok; + char timebuf[ISO_TIME_LEN+1]; + struct in_addr in; + int offset = 0; + tor_assert(tokens); + tor_assert(bool_eq(vote, vote_rs)); + + if (!consensus_method) + flav = FLAV_NS; + tor_assert(flav == FLAV_NS || flav == FLAV_MICRODESC); + - eos = find_start_of_next_routerstatus(*s); ++ eos = find_start_of_next_routerstatus(*s, s_eos); + + if (tokenize_string(area,*s, eos, tokens, rtrstatus_token_table,0)) { + log_warn(LD_DIR, "Error tokenizing router status"); + goto err; + } + if (smartlist_len(tokens) < 1) { + log_warn(LD_DIR, "Impossibly short router status"); + goto err; + } + tok = find_by_keyword(tokens, K_R); + tor_assert(tok->n_args >= 7); /* guaranteed by GE(7) in K_R setup */ + if (flav == FLAV_NS) { + if (tok->n_args < 8) { + log_warn(LD_DIR, "Too few arguments to r"); + goto err; + } + } else if (flav == FLAV_MICRODESC) { + offset = -1; /* There is no descriptor digest in an md consensus r line */ + } + + if (vote_rs) { + rs = &vote_rs->status; + } else { + rs = tor_malloc_zero(sizeof(routerstatus_t)); + } + + if (!is_legal_nickname(tok->args[0])) { + log_warn(LD_DIR, + "Invalid nickname %s in router status; skipping.", + escaped(tok->args[0])); + goto err; + } + strlcpy(rs->nickname, tok->args[0], sizeof(rs->nickname)); + + if (digest_from_base64(rs->identity_digest, tok->args[1])) { + log_warn(LD_DIR, "Error decoding identity digest %s", + escaped(tok->args[1])); + goto err; + } + + if (flav == FLAV_NS) { + if (digest_from_base64(rs->descriptor_digest, tok->args[2])) { + log_warn(LD_DIR, "Error decoding descriptor digest %s", + escaped(tok->args[2])); + goto err; + } + } + + if (tor_snprintf(timebuf, sizeof(timebuf), "%s %s", + tok->args[3+offset], tok->args[4+offset]) < 0 || + parse_iso_time(timebuf, &rs->published_on)<0) { + log_warn(LD_DIR, "Error parsing time '%s %s' [%d %d]", + tok->args[3+offset], tok->args[4+offset], + offset, (int)flav); + goto err; + } + + if (tor_inet_aton(tok->args[5+offset], &in) == 0) { + log_warn(LD_DIR, "Error parsing router address in network-status %s", + escaped(tok->args[5+offset])); + goto err; + } + rs->addr = ntohl(in.s_addr); + + rs->or_port = (uint16_t) tor_parse_long(tok->args[6+offset], + 10,0,65535,NULL,NULL); + rs->dir_port = (uint16_t) tor_parse_long(tok->args[7+offset], + 10,0,65535,NULL,NULL); + + { + smartlist_t *a_lines = find_all_by_keyword(tokens, K_A); + if (a_lines) { + find_single_ipv6_orport(a_lines, &rs->ipv6_addr, &rs->ipv6_orport); + smartlist_free(a_lines); + } + } + + tok = find_opt_by_keyword(tokens, K_S); + if (tok && vote) { + int i; + vote_rs->flags = 0; + for (i=0; i < tok->n_args; ++i) { + int p = smartlist_string_pos(vote->known_flags, tok->args[i]); + if (p >= 0) { + vote_rs->flags |= (UINT64_C(1)<<p); + } else { + log_warn(LD_DIR, "Flags line had a flag %s not listed in known_flags.", + escaped(tok->args[i])); + goto err; + } + } + } else if (tok) { + /* This is a consensus, not a vote. */ + int i; + for (i=0; i < tok->n_args; ++i) { + if (!strcmp(tok->args[i], "Exit")) + rs->is_exit = 1; + else if (!strcmp(tok->args[i], "Stable")) + rs->is_stable = 1; + else if (!strcmp(tok->args[i], "Fast")) + rs->is_fast = 1; + else if (!strcmp(tok->args[i], "Running")) + rs->is_flagged_running = 1; + else if (!strcmp(tok->args[i], "Named")) + rs->is_named = 1; + else if (!strcmp(tok->args[i], "Valid")) + rs->is_valid = 1; + else if (!strcmp(tok->args[i], "Guard")) + rs->is_possible_guard = 1; + else if (!strcmp(tok->args[i], "BadExit")) + rs->is_bad_exit = 1; + else if (!strcmp(tok->args[i], "Authority")) + rs->is_authority = 1; + else if (!strcmp(tok->args[i], "Unnamed") && + consensus_method >= 2) { + /* Unnamed is computed right by consensus method 2 and later. */ + rs->is_unnamed = 1; + } else if (!strcmp(tok->args[i], "HSDir")) { + rs->is_hs_dir = 1; + } else if (!strcmp(tok->args[i], "V2Dir")) { + rs->is_v2_dir = 1; + } + } + /* These are implied true by having been included in a consensus made + * with a given method */ + rs->is_flagged_running = 1; /* Starting with consensus method 4. */ + rs->is_valid = 1; /* Starting with consensus method 24. */ + } + { + const char *protocols = NULL, *version = NULL; + if ((tok = find_opt_by_keyword(tokens, K_PROTO))) { + tor_assert(tok->n_args == 1); + protocols = tok->args[0]; + } + if ((tok = find_opt_by_keyword(tokens, K_V))) { + tor_assert(tok->n_args == 1); + version = tok->args[0]; + if (vote_rs) { + vote_rs->version = tor_strdup(tok->args[0]); + } + } + + summarize_protover_flags(&rs->pv, protocols, version); + } + + /* handle weighting/bandwidth info */ + if ((tok = find_opt_by_keyword(tokens, K_W))) { + int i; + for (i=0; i < tok->n_args; ++i) { + if (!strcmpstart(tok->args[i], "Bandwidth=")) { + int ok; + rs->bandwidth_kb = + (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, + 10, 0, UINT32_MAX, + &ok, NULL); + if (!ok) { + log_warn(LD_DIR, "Invalid Bandwidth %s", escaped(tok->args[i])); + goto err; + } + rs->has_bandwidth = 1; + } else if (!strcmpstart(tok->args[i], "Measured=") && vote_rs) { + int ok; + vote_rs->measured_bw_kb = + (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, + 10, 0, UINT32_MAX, &ok, NULL); + if (!ok) { + log_warn(LD_DIR, "Invalid Measured Bandwidth %s", + escaped(tok->args[i])); + goto err; + } + vote_rs->has_measured_bw = 1; + vote->has_measured_bws = 1; + } else if (!strcmpstart(tok->args[i], "Unmeasured=1")) { + rs->bw_is_unmeasured = 1; + } else if (!strcmpstart(tok->args[i], "GuardFraction=")) { + if (routerstatus_parse_guardfraction(tok->args[i], + vote, vote_rs, rs) < 0) { + goto err; + } + } + } + } + + /* parse exit policy summaries */ + if ((tok = find_opt_by_keyword(tokens, K_P))) { + tor_assert(tok->n_args == 1); + if (strcmpstart(tok->args[0], "accept ") && + strcmpstart(tok->args[0], "reject ")) { + log_warn(LD_DIR, "Unknown exit policy summary type %s.", + escaped(tok->args[0])); + goto err; + } + /* XXX weasel: parse this into ports and represent them somehow smart, + * maybe not here but somewhere on if we need it for the client. + * we should still parse it here to check it's valid tho. + */ + rs->exitsummary = tor_strdup(tok->args[0]); + rs->has_exitsummary = 1; + } + + if (vote_rs) { + SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, t) { + if (t->tp == K_M && t->n_args) { + vote_microdesc_hash_t *line = + tor_malloc(sizeof(vote_microdesc_hash_t)); + line->next = vote_rs->microdesc; + line->microdesc_hash_line = tor_strdup(t->args[0]); + vote_rs->microdesc = line; + } + if (t->tp == K_ID) { + tor_assert(t->n_args >= 2); + if (!strcmp(t->args[0], "ed25519")) { + vote_rs->has_ed25519_listing = 1; + if (strcmp(t->args[1], "none") && + digest256_from_base64((char*)vote_rs->ed25519_id, + t->args[1])<0) { + log_warn(LD_DIR, "Bogus ed25519 key in networkstatus vote"); + goto err; + } + } + } + if (t->tp == K_PROTO) { + tor_assert(t->n_args == 1); + vote_rs->protocols = tor_strdup(t->args[0]); + } + } SMARTLIST_FOREACH_END(t); + } else if (flav == FLAV_MICRODESC) { + tok = find_opt_by_keyword(tokens, K_M); + if (tok) { + tor_assert(tok->n_args); + if (digest256_from_base64(rs->descriptor_digest, tok->args[0])) { + log_warn(LD_DIR, "Error decoding microdescriptor digest %s", + escaped(tok->args[0])); + goto err; + } + } else { + log_info(LD_BUG, "Found an entry in networkstatus with no " + "microdescriptor digest. (Router %s ($%s) at %s:%d.)", + rs->nickname, hex_str(rs->identity_digest, DIGEST_LEN), + fmt_addr32(rs->addr), rs->or_port); + } + } + + if (!strcasecmp(rs->nickname, UNNAMED_ROUTER_NICKNAME)) + rs->is_named = 0; + + goto done; + err: + dump_desc(s_dup, "routerstatus entry"); + if (rs && !vote_rs) + routerstatus_free(rs); + rs = NULL; + done: + SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); + smartlist_clear(tokens); + if (area) { + DUMP_AREA(area, "routerstatus entry"); + memarea_clear(area); + } + *s = eos; + + return rs; +} + +int +compare_vote_routerstatus_entries(const void **_a, const void **_b) +{ + const vote_routerstatus_t *a = *_a, *b = *_b; + return fast_memcmp(a->status.identity_digest, b->status.identity_digest, + DIGEST_LEN); +} + +/** Verify the bandwidth weights of a network status document */ +int +networkstatus_verify_bw_weights(networkstatus_t *ns, int consensus_method) +{ + int64_t G=0, M=0, E=0, D=0, T=0; + double Wgg, Wgm, Wgd, Wmg, Wmm, Wme, Wmd, Weg, Wem, Wee, Wed; + double Gtotal=0, Mtotal=0, Etotal=0; + const char *casename = NULL; + int valid = 1; + (void) consensus_method; + + const int64_t weight_scale = networkstatus_get_weight_scale_param(ns); + tor_assert(weight_scale >= 1); + Wgg = networkstatus_get_bw_weight(ns, "Wgg", -1); + Wgm = networkstatus_get_bw_weight(ns, "Wgm", -1); + Wgd = networkstatus_get_bw_weight(ns, "Wgd", -1); + Wmg = networkstatus_get_bw_weight(ns, "Wmg", -1); + Wmm = networkstatus_get_bw_weight(ns, "Wmm", -1); + Wme = networkstatus_get_bw_weight(ns, "Wme", -1); + Wmd = networkstatus_get_bw_weight(ns, "Wmd", -1); + Weg = networkstatus_get_bw_weight(ns, "Weg", -1); + Wem = networkstatus_get_bw_weight(ns, "Wem", -1); + Wee = networkstatus_get_bw_weight(ns, "Wee", -1); + Wed = networkstatus_get_bw_weight(ns, "Wed", -1); + + if (Wgg<0 || Wgm<0 || Wgd<0 || Wmg<0 || Wmm<0 || Wme<0 || Wmd<0 || Weg<0 + || Wem<0 || Wee<0 || Wed<0) { + log_warn(LD_BUG, "No bandwidth weights produced in consensus!"); + return 0; + } + + // First, sanity check basic summing properties that hold for all cases + // We use > 1 as the check for these because they are computed as integers. + // Sometimes there are rounding errors. + if (fabs(Wmm - weight_scale) > 1) { + log_warn(LD_BUG, "Wmm=%f != %"PRId64, + Wmm, (weight_scale)); + valid = 0; + } + + if (fabs(Wem - Wee) > 1) { + log_warn(LD_BUG, "Wem=%f != Wee=%f", Wem, Wee); + valid = 0; + } + + if (fabs(Wgm - Wgg) > 1) { + log_warn(LD_BUG, "Wgm=%f != Wgg=%f", Wgm, Wgg); + valid = 0; + } + + if (fabs(Weg - Wed) > 1) { + log_warn(LD_BUG, "Wed=%f != Weg=%f", Wed, Weg); + valid = 0; + } + + if (fabs(Wgg + Wmg - weight_scale) > 0.001*weight_scale) { + log_warn(LD_BUG, "Wgg=%f != %"PRId64" - Wmg=%f", Wgg, + (weight_scale), Wmg); + valid = 0; + } + + if (fabs(Wee + Wme - weight_scale) > 0.001*weight_scale) { + log_warn(LD_BUG, "Wee=%f != %"PRId64" - Wme=%f", Wee, + (weight_scale), Wme); + valid = 0; + } + + if (fabs(Wgd + Wmd + Wed - weight_scale) > 0.001*weight_scale) { + log_warn(LD_BUG, "Wgd=%f + Wmd=%f + Wed=%f != %"PRId64, + Wgd, Wmd, Wed, (weight_scale)); + valid = 0; + } + + Wgg /= weight_scale; + Wgm /= weight_scale; (void) Wgm; // unused from here on. + Wgd /= weight_scale; + + Wmg /= weight_scale; + Wmm /= weight_scale; + Wme /= weight_scale; + Wmd /= weight_scale; + + Weg /= weight_scale; (void) Weg; // unused from here on. + Wem /= weight_scale; (void) Wem; // unused from here on. + Wee /= weight_scale; + Wed /= weight_scale; + + // Then, gather G, M, E, D, T to determine case + SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) { + int is_exit = 0; + /* Bug #2203: Don't count bad exits as exits for balancing */ + is_exit = rs->is_exit && !rs->is_bad_exit; + if (rs->has_bandwidth) { + T += rs->bandwidth_kb; + if (is_exit && rs->is_possible_guard) { + D += rs->bandwidth_kb; + Gtotal += Wgd*rs->bandwidth_kb; + Mtotal += Wmd*rs->bandwidth_kb; + Etotal += Wed*rs->bandwidth_kb; + } else if (is_exit) { + E += rs->bandwidth_kb; + Mtotal += Wme*rs->bandwidth_kb; + Etotal += Wee*rs->bandwidth_kb; + } else if (rs->is_possible_guard) { + G += rs->bandwidth_kb; + Gtotal += Wgg*rs->bandwidth_kb; + Mtotal += Wmg*rs->bandwidth_kb; + } else { + M += rs->bandwidth_kb; + Mtotal += Wmm*rs->bandwidth_kb; + } + } else { + log_warn(LD_BUG, "Missing consensus bandwidth for router %s", + routerstatus_describe(rs)); + } + } SMARTLIST_FOREACH_END(rs); + + // Finally, check equality conditions depending upon case 1, 2 or 3 + // Full equality cases: 1, 3b + // Partial equality cases: 2b (E=G), 3a (M=E) + // Fully unknown: 2a + if (3*E >= T && 3*G >= T) { + // Case 1: Neither are scarce + casename = "Case 1"; + if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Mtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Mtotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } else if (3*E < T && 3*G < T) { + int64_t R = MIN(E, G); + int64_t S = MAX(E, G); + /* + * Case 2: Both Guards and Exits are scarce + * Balance D between E and G, depending upon + * D capacity and scarcity. Devote no extra + * bandwidth to middle nodes. + */ + if (R+D < S) { // Subcase a + double Rtotal, Stotal; + if (E < G) { + Rtotal = Etotal; + Stotal = Gtotal; + } else { + Rtotal = Gtotal; + Stotal = Etotal; + } + casename = "Case 2a"; + // Rtotal < Stotal + if (Rtotal > Stotal) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Rtotal %f > Stotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Rtotal, Stotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + // Rtotal < T/3 + if (3*Rtotal > T) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: 3*Rtotal %f > T " + "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 + " D=%"PRId64" T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Rtotal*3, (T), + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + // Stotal < T/3 + if (3*Stotal > T) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: 3*Stotal %f > T " + "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 + " D=%"PRId64" T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Stotal*3, (T), + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + // Mtotal > T/3 + if (3*Mtotal < T) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: 3*Mtotal %f < T " + "%"PRId64". " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Mtotal*3, (T), + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } else { // Subcase b: R+D > S + casename = "Case 2b"; + + /* Check the rare-M redirect case. */ + if (D != 0 && 3*M < T) { + casename = "Case 2b (balanced)"; + if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Mtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Mtotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } else { + if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } + } + } else { // if (E < T/3 || G < T/3) { + int64_t S = MIN(E, G); + int64_t NS = MAX(E, G); + if (3*(S+D) < T) { // Subcase a: + double Stotal; + double NStotal; + if (G < E) { + casename = "Case 3a (G scarce)"; + Stotal = Gtotal; + NStotal = Etotal; + } else { // if (G >= E) { + casename = "Case 3a (E scarce)"; + NStotal = Gtotal; + Stotal = Etotal; + } + // Stotal < T/3 + if (3*Stotal > T) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: 3*Stotal %f > T " + "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 + " D=%"PRId64" T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Stotal*3, (T), + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (NS >= M) { + if (fabs(NStotal-Mtotal) > 0.01*MAX(NStotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: NStotal %f != Mtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, NStotal, Mtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } else { + // if NS < M, NStotal > T/3 because only one of G or E is scarce + if (3*NStotal < T) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: 3*NStotal %f < T " + "%"PRId64". G=%"PRId64" M=%"PRId64 + " E=%"PRId64" D=%"PRId64" T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, NStotal*3, (T), + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } + } else { // Subcase b: S+D >= T/3 + casename = "Case 3b"; + if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Mtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Etotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { + log_warn(LD_DIR, + "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " + "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 + " T=%"PRId64". " + "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", + casename, Mtotal, Gtotal, + (G), (M), (E), + (D), (T), + Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); + valid = 0; + } + } + } + + if (valid) + log_notice(LD_DIR, "Bandwidth-weight %s is verified and valid.", + casename); + + return valid; +} + +/** Check if a shared random value of type srv_type is in + * tokens. If there is, parse it and set it to srv_out. Return + * -1 on failure, 0 on success. The resulting srv is allocated on the heap and + * it's the responsibility of the caller to free it. */ +static int +extract_one_srv(smartlist_t *tokens, directory_keyword srv_type, + sr_srv_t **srv_out) +{ + int ret = -1; + directory_token_t *tok; + sr_srv_t *srv = NULL; + smartlist_t *chunks; + + tor_assert(tokens); + + chunks = smartlist_new(); + tok = find_opt_by_keyword(tokens, srv_type); + if (!tok) { + /* That's fine, no SRV is allowed. */ + ret = 0; + goto end; + } + for (int i = 0; i < tok->n_args; i++) { + smartlist_add(chunks, tok->args[i]); + } + srv = sr_parse_srv(chunks); + if (srv == NULL) { + log_warn(LD_DIR, "SR: Unparseable SRV %s", escaped(tok->object_body)); + goto end; + } + /* All is good. */ + *srv_out = srv; + ret = 0; + end: + smartlist_free(chunks); + return ret; +} + +/** Extract any shared random values found in tokens and place them in + * the networkstatus ns. */ +static void +extract_shared_random_srvs(networkstatus_t *ns, smartlist_t *tokens) +{ + const char *voter_identity; + networkstatus_voter_info_t *voter; + + tor_assert(ns); + tor_assert(tokens); + /* Can be only one of them else code flow. */ + tor_assert(ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS); + + if (ns->type == NS_TYPE_VOTE) { + voter = smartlist_get(ns->voters, 0); + tor_assert(voter); + voter_identity = hex_str(voter->identity_digest, + sizeof(voter->identity_digest)); + } else { + /* Consensus has multiple voters so no specific voter. */ + voter_identity = "consensus"; + } + + /* We extract both, and on error everything is stopped because it means + * the vote is malformed for the shared random value(s). */ + if (extract_one_srv(tokens, K_PREVIOUS_SRV, &ns->sr_info.previous_srv) < 0) { + log_warn(LD_DIR, "SR: Unable to parse previous SRV from %s", + voter_identity); + /* Maybe we have a chance with the current SRV so let's try it anyway. */ + } + if (extract_one_srv(tokens, K_CURRENT_SRV, &ns->sr_info.current_srv) < 0) { + log_warn(LD_DIR, "SR: Unable to parse current SRV from %s", + voter_identity); + } +} + +/** Parse a v3 networkstatus vote, opinion, or consensus (depending on + * ns_type), from s, and return the result. Return NULL on failure. */ +networkstatus_t * - networkstatus_parse_vote_from_string(const char *s, const char **eos_out, ++networkstatus_parse_vote_from_string(const char *s, ++ size_t s_len, ++ const char **eos_out, + networkstatus_type_t ns_type) +{ + smartlist_t *tokens = smartlist_new(); + smartlist_t *rs_tokens = NULL, *footer_tokens = NULL; + networkstatus_voter_info_t *voter = NULL; + networkstatus_t *ns = NULL; + common_digests_t ns_digests; + uint8_t sha3_as_signed[DIGEST256_LEN]; + const char *cert, *end_of_header, *end_of_footer, *s_dup = s; + directory_token_t *tok; + struct in_addr in; + int i, inorder, n_signatures = 0; + memarea_t *area = NULL, *rs_area = NULL; + consensus_flavor_t flav = FLAV_NS; + char *last_kwd=NULL; ++ const char *eos = s + s_len; + + tor_assert(s); + + if (eos_out) + *eos_out = NULL; + - if (router_get_networkstatus_v3_hashes(s, &ns_digests) || - router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, s)<0) { ++ if (router_get_networkstatus_v3_hashes(s, s_len, &ns_digests) || ++ router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, ++ s, s_len)<0) { + log_warn(LD_DIR, "Unable to compute digest of network-status"); + goto err; + } + + area = memarea_new(); - end_of_header = find_start_of_next_routerstatus(s); ++ end_of_header = find_start_of_next_routerstatus(s, eos); + if (tokenize_string(area, s, end_of_header, tokens, + (ns_type == NS_TYPE_CONSENSUS) ? + networkstatus_consensus_token_table : + networkstatus_token_table, 0)) { + log_warn(LD_DIR, "Error tokenizing network-status header"); + goto err; + } + + ns = tor_malloc_zero(sizeof(networkstatus_t)); + memcpy(&ns->digests, &ns_digests, sizeof(ns_digests)); + memcpy(&ns->digest_sha3_as_signed, sha3_as_signed, sizeof(sha3_as_signed)); + + tok = find_by_keyword(tokens, K_NETWORK_STATUS_VERSION); + tor_assert(tok); + if (tok->n_args > 1) { + int flavor = networkstatus_parse_flavor_name(tok->args[1]); + if (flavor < 0) { + log_warn(LD_DIR, "Can't parse document with unknown flavor %s", + escaped(tok->args[1])); + goto err; + } + ns->flavor = flav = flavor; + } + if (flav != FLAV_NS && ns_type != NS_TYPE_CONSENSUS) { + log_warn(LD_DIR, "Flavor found on non-consensus networkstatus."); + goto err; + } + + if (ns_type != NS_TYPE_CONSENSUS) { + const char *end_of_cert = NULL; - if (!(cert = strstr(s, "\ndir-key-certificate-version"))) ++ if (!(cert = tor_memstr(s, end_of_header - s, ++ "\ndir-key-certificate-version"))) + goto err; + ++cert; - ns->cert = authority_cert_parse_from_string(cert, &end_of_cert); ++ ns->cert = authority_cert_parse_from_string(cert, end_of_header - cert, ++ &end_of_cert); + if (!ns->cert || !end_of_cert || end_of_cert > end_of_header) + goto err; + } + + tok = find_by_keyword(tokens, K_VOTE_STATUS); + tor_assert(tok->n_args); + if (!strcmp(tok->args[0], "vote")) { + ns->type = NS_TYPE_VOTE; + } else if (!strcmp(tok->args[0], "consensus")) { + ns->type = NS_TYPE_CONSENSUS; + } else if (!strcmp(tok->args[0], "opinion")) { + ns->type = NS_TYPE_OPINION; + } else { + log_warn(LD_DIR, "Unrecognized vote status %s in network-status", + escaped(tok->args[0])); + goto err; + } + if (ns_type != ns->type) { + log_warn(LD_DIR, "Got the wrong kind of v3 networkstatus."); + goto err; + } + + if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_OPINION) { + tok = find_by_keyword(tokens, K_PUBLISHED); + if (parse_iso_time(tok->args[0], &ns->published)) + goto err; + + ns->supported_methods = smartlist_new(); + tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHODS); + if (tok) { + for (i=0; i < tok->n_args; ++i) + smartlist_add_strdup(ns->supported_methods, tok->args[i]); + } else { + smartlist_add_strdup(ns->supported_methods, "1"); + } + } else { + tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHOD); + if (tok) { + int num_ok; + ns->consensus_method = (int)tor_parse_long(tok->args[0], 10, 1, INT_MAX, + &num_ok, NULL); + if (!num_ok) + goto err; + } else { + ns->consensus_method = 1; + } + } + + if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_CLIENT_PROTOCOLS))) + ns->recommended_client_protocols = tor_strdup(tok->args[0]); + if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_RELAY_PROTOCOLS))) + ns->recommended_relay_protocols = tor_strdup(tok->args[0]); + if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_CLIENT_PROTOCOLS))) + ns->required_client_protocols = tor_strdup(tok->args[0]); + if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_RELAY_PROTOCOLS))) + ns->required_relay_protocols = tor_strdup(tok->args[0]); + + tok = find_by_keyword(tokens, K_VALID_AFTER); + if (parse_iso_time(tok->args[0], &ns->valid_after)) + goto err; + + tok = find_by_keyword(tokens, K_FRESH_UNTIL); + if (parse_iso_time(tok->args[0], &ns->fresh_until)) + goto err; + + tok = find_by_keyword(tokens, K_VALID_UNTIL); + if (parse_iso_time(tok->args[0], &ns->valid_until)) + goto err; + + tok = find_by_keyword(tokens, K_VOTING_DELAY); + tor_assert(tok->n_args >= 2); + { + int ok; + ns->vote_seconds = + (int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &ok, NULL); + if (!ok) + goto err; + ns->dist_seconds = + (int) tor_parse_long(tok->args[1], 10, 0, INT_MAX, &ok, NULL); + if (!ok) + goto err; + } + if (ns->valid_after + + (get_options()->TestingTorNetwork ? + MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL) > ns->fresh_until) { + log_warn(LD_DIR, "Vote/consensus freshness interval is too short"); + goto err; + } + if (ns->valid_after + + (get_options()->TestingTorNetwork ? + MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL)*2 > ns->valid_until) { + log_warn(LD_DIR, "Vote/consensus liveness interval is too short"); + goto err; + } + if (ns->vote_seconds < MIN_VOTE_SECONDS) { + log_warn(LD_DIR, "Vote seconds is too short"); + goto err; + } + if (ns->dist_seconds < MIN_DIST_SECONDS) { + log_warn(LD_DIR, "Dist seconds is too short"); + goto err; + } + + if ((tok = find_opt_by_keyword(tokens, K_CLIENT_VERSIONS))) { + ns->client_versions = tor_strdup(tok->args[0]); + } + if ((tok = find_opt_by_keyword(tokens, K_SERVER_VERSIONS))) { + ns->server_versions = tor_strdup(tok->args[0]); + } + + { + smartlist_t *package_lst = find_all_by_keyword(tokens, K_PACKAGE); + ns->package_lines = smartlist_new(); + if (package_lst) { + SMARTLIST_FOREACH(package_lst, directory_token_t *, t, + smartlist_add_strdup(ns->package_lines, t->args[0])); + } + smartlist_free(package_lst); + } + + tok = find_by_keyword(tokens, K_KNOWN_FLAGS); + ns->known_flags = smartlist_new(); + inorder = 1; + for (i = 0; i < tok->n_args; ++i) { + smartlist_add_strdup(ns->known_flags, tok->args[i]); + if (i>0 && strcmp(tok->args[i-1], tok->args[i])>= 0) { + log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); + inorder = 0; + } + } + if (!inorder) { + log_warn(LD_DIR, "known-flags not in order"); + goto err; + } + if (ns->type != NS_TYPE_CONSENSUS && + smartlist_len(ns->known_flags) > MAX_KNOWN_FLAGS_IN_VOTE) { + /* If we allowed more than 64 flags in votes, then parsing them would make + * us invoke undefined behavior whenever we used 1<<flagnum to do a + * bit-shift. This is only for votes and opinions: consensus users don't + * care about flags they don't recognize, and so don't build a bitfield + * for them. */ + log_warn(LD_DIR, "Too many known-flags in consensus vote or opinion"); + goto err; + } + + tok = find_opt_by_keyword(tokens, K_PARAMS); + if (tok) { + int any_dups = 0; + inorder = 1; + ns->net_params = smartlist_new(); + for (i = 0; i < tok->n_args; ++i) { + int ok=0; + char *eq = strchr(tok->args[i], '='); + size_t eq_pos; + if (!eq) { + log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); + goto err; + } + eq_pos = eq-tok->args[i]; + tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); + if (!ok) { + log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); + goto err; + } + if (i > 0 && strcmp(tok->args[i-1], tok->args[i]) >= 0) { + log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); + inorder = 0; + } + if (last_kwd && eq_pos == strlen(last_kwd) && + fast_memeq(last_kwd, tok->args[i], eq_pos)) { + log_warn(LD_DIR, "Duplicate value for %s parameter", + escaped(tok->args[i])); + any_dups = 1; + } + tor_free(last_kwd); + last_kwd = tor_strndup(tok->args[i], eq_pos); + smartlist_add_strdup(ns->net_params, tok->args[i]); + } + if (!inorder) { + log_warn(LD_DIR, "params not in order"); + goto err; + } + if (any_dups) { + log_warn(LD_DIR, "Duplicate in parameters"); + goto err; + } + } + + ns->voters = smartlist_new(); + + SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { + tok = _tok; + if (tok->tp == K_DIR_SOURCE) { + tor_assert(tok->n_args >= 6); + + if (voter) + smartlist_add(ns->voters, voter); + voter = tor_malloc_zero(sizeof(networkstatus_voter_info_t)); + voter->sigs = smartlist_new(); + if (ns->type != NS_TYPE_CONSENSUS) + memcpy(voter->vote_digest, ns_digests.d[DIGEST_SHA1], DIGEST_LEN); + + voter->nickname = tor_strdup(tok->args[0]); + if (strlen(tok->args[1]) != HEX_DIGEST_LEN || + base16_decode(voter->identity_digest, sizeof(voter->identity_digest), + tok->args[1], HEX_DIGEST_LEN) + != sizeof(voter->identity_digest)) { + log_warn(LD_DIR, "Error decoding identity digest %s in " + "network-status document.", escaped(tok->args[1])); + goto err; + } + if (ns->type != NS_TYPE_CONSENSUS && + tor_memneq(ns->cert->cache_info.identity_digest, + voter->identity_digest, DIGEST_LEN)) { + log_warn(LD_DIR,"Mismatch between identities in certificate and vote"); + goto err; + } + if (ns->type != NS_TYPE_CONSENSUS) { + if (authority_cert_is_blacklisted(ns->cert)) { + log_warn(LD_DIR, "Rejecting vote signature made with blacklisted " + "signing key %s", + hex_str(ns->cert->signing_key_digest, DIGEST_LEN)); + goto err; + } + } + voter->address = tor_strdup(tok->args[2]); + if (!tor_inet_aton(tok->args[3], &in)) { + log_warn(LD_DIR, "Error decoding IP address %s in network-status.", + escaped(tok->args[3])); + goto err; + } + voter->addr = ntohl(in.s_addr); + int ok; + voter->dir_port = (uint16_t) + tor_parse_long(tok->args[4], 10, 0, 65535, &ok, NULL); + if (!ok) + goto err; + voter->or_port = (uint16_t) + tor_parse_long(tok->args[5], 10, 0, 65535, &ok, NULL); + if (!ok) + goto err; + } else if (tok->tp == K_CONTACT) { + if (!voter || voter->contact) { + log_warn(LD_DIR, "contact element is out of place."); + goto err; + } + voter->contact = tor_strdup(tok->args[0]); + } else if (tok->tp == K_VOTE_DIGEST) { + tor_assert(ns->type == NS_TYPE_CONSENSUS); + tor_assert(tok->n_args >= 1); + if (!voter || ! tor_digest_is_zero(voter->vote_digest)) { + log_warn(LD_DIR, "vote-digest element is out of place."); + goto err; + } + if (strlen(tok->args[0]) != HEX_DIGEST_LEN || + base16_decode(voter->vote_digest, sizeof(voter->vote_digest), + tok->args[0], HEX_DIGEST_LEN) + != sizeof(voter->vote_digest)) { + log_warn(LD_DIR, "Error decoding vote digest %s in " + "network-status consensus.", escaped(tok->args[0])); + goto err; + } + } + } SMARTLIST_FOREACH_END(_tok); + if (voter) { + smartlist_add(ns->voters, voter); + voter = NULL; + } + if (smartlist_len(ns->voters) == 0) { + log_warn(LD_DIR, "Missing dir-source elements in a networkstatus."); + goto err; + } else if (ns->type != NS_TYPE_CONSENSUS && smartlist_len(ns->voters) != 1) { + log_warn(LD_DIR, "Too many dir-source elements in a vote networkstatus."); + goto err; + } + + if (ns->type != NS_TYPE_CONSENSUS && + (tok = find_opt_by_keyword(tokens, K_LEGACY_DIR_KEY))) { + int bad = 1; + if (strlen(tok->args[0]) == HEX_DIGEST_LEN) { + networkstatus_voter_info_t *voter_0 = smartlist_get(ns->voters, 0); + if (base16_decode(voter_0->legacy_id_digest, DIGEST_LEN, + tok->args[0], HEX_DIGEST_LEN) != DIGEST_LEN) + bad = 1; + else + bad = 0; + } + if (bad) { + log_warn(LD_DIR, "Invalid legacy key digest %s on vote.", + escaped(tok->args[0])); + } + } + + /* If this is a vote document, check if information about the shared + randomness protocol is included, and extract it. */ + if (ns->type == NS_TYPE_VOTE) { + dirvote_parse_sr_commits(ns, tokens); + } + /* For both a vote and consensus, extract the shared random values. */ + if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS) { + extract_shared_random_srvs(ns, tokens); + } + + /* Parse routerstatus lines. */ + rs_tokens = smartlist_new(); + rs_area = memarea_new(); + s = end_of_header; + ns->routerstatus_list = smartlist_new(); + - while (!strcmpstart(s, "r ")) { ++ while (eos - s >= 2 && fast_memeq(s, "r ", 2)) { + if (ns->type != NS_TYPE_CONSENSUS) { + vote_routerstatus_t *rs = tor_malloc_zero(sizeof(vote_routerstatus_t)); - if (routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, ns, ++ if (routerstatus_parse_entry_from_string(rs_area, &s, eos, rs_tokens, ns, + rs, 0, 0)) { + smartlist_add(ns->routerstatus_list, rs); + } else { + vote_routerstatus_free(rs); + } + } else { + routerstatus_t *rs; - if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, ++ if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, eos, ++ rs_tokens, + NULL, NULL, + ns->consensus_method, + flav))) { + /* Use exponential-backoff scheduling when downloading microdescs */ + smartlist_add(ns->routerstatus_list, rs); + } + } + } + for (i = 1; i < smartlist_len(ns->routerstatus_list); ++i) { + routerstatus_t *rs1, *rs2; + if (ns->type != NS_TYPE_CONSENSUS) { + vote_routerstatus_t *a = smartlist_get(ns->routerstatus_list, i-1); + vote_routerstatus_t *b = smartlist_get(ns->routerstatus_list, i); + rs1 = &a->status; rs2 = &b->status; + } else { + rs1 = smartlist_get(ns->routerstatus_list, i-1); + rs2 = smartlist_get(ns->routerstatus_list, i); + } + if (fast_memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) + >= 0) { + log_warn(LD_DIR, "Networkstatus entries not sorted by identity digest"); + goto err; + } + } + if (ns_type != NS_TYPE_CONSENSUS) { + digest256map_t *ed_id_map = digest256map_new(); + SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, vote_routerstatus_t *, + vrs) { + if (! vrs->has_ed25519_listing || + tor_mem_is_zero((const char *)vrs->ed25519_id, DIGEST256_LEN)) + continue; + if (digest256map_get(ed_id_map, vrs->ed25519_id) != NULL) { + log_warn(LD_DIR, "Vote networkstatus ed25519 identities were not " + "unique"); + digest256map_free(ed_id_map, NULL); + goto err; + } + digest256map_set(ed_id_map, vrs->ed25519_id, (void*)1); + } SMARTLIST_FOREACH_END(vrs); + digest256map_free(ed_id_map, NULL); + } + + /* Parse footer; check signature. */ + footer_tokens = smartlist_new(); - if ((end_of_footer = strstr(s, "\nnetwork-status-version "))) ++ if ((end_of_footer = tor_memstr(s, eos-s, "\nnetwork-status-version "))) + ++end_of_footer; + else - end_of_footer = s + strlen(s); ++ end_of_footer = eos; + if (tokenize_string(area,s, end_of_footer, footer_tokens, + networkstatus_vote_footer_token_table, 0)) { + log_warn(LD_DIR, "Error tokenizing network-status vote footer."); + goto err; + } + + { + int found_sig = 0; + SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { + tok = _tok; + if (tok->tp == K_DIRECTORY_SIGNATURE) + found_sig = 1; + else if (found_sig) { + log_warn(LD_DIR, "Extraneous token after first directory-signature"); + goto err; + } + } SMARTLIST_FOREACH_END(_tok); + } + + if ((tok = find_opt_by_keyword(footer_tokens, K_DIRECTORY_FOOTER))) { + if (tok != smartlist_get(footer_tokens, 0)) { + log_warn(LD_DIR, "Misplaced directory-footer token"); + goto err; + } + } + + tok = find_opt_by_keyword(footer_tokens, K_BW_WEIGHTS); + if (tok) { + ns->weight_params = smartlist_new(); + for (i = 0; i < tok->n_args; ++i) { + int ok=0; + char *eq = strchr(tok->args[i], '='); + if (!eq) { + log_warn(LD_DIR, "Bad element '%s' in weight params", + escaped(tok->args[i])); + goto err; + } + tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); + if (!ok) { + log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); + goto err; + } + smartlist_add_strdup(ns->weight_params, tok->args[i]); + } + } + + SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { + char declared_identity[DIGEST_LEN]; + networkstatus_voter_info_t *v; + document_signature_t *sig; + const char *id_hexdigest = NULL; + const char *sk_hexdigest = NULL; + digest_algorithm_t alg = DIGEST_SHA1; + tok = _tok; + if (tok->tp != K_DIRECTORY_SIGNATURE) + continue; + tor_assert(tok->n_args >= 2); + if (tok->n_args == 2) { + id_hexdigest = tok->args[0]; + sk_hexdigest = tok->args[1]; + } else { + const char *algname = tok->args[0]; + int a; + id_hexdigest = tok->args[1]; + sk_hexdigest = tok->args[2]; + a = crypto_digest_algorithm_parse_name(algname); + if (a<0) { + log_warn(LD_DIR, "Unknown digest algorithm %s; skipping", + escaped(algname)); + continue; + } + alg = a; + } + + if (!tok->object_type || + strcmp(tok->object_type, "SIGNATURE") || + tok->object_size < 128 || tok->object_size > 512) { + log_warn(LD_DIR, "Bad object type or length on directory-signature"); + goto err; + } + + if (strlen(id_hexdigest) != HEX_DIGEST_LEN || + base16_decode(declared_identity, sizeof(declared_identity), + id_hexdigest, HEX_DIGEST_LEN) + != sizeof(declared_identity)) { + log_warn(LD_DIR, "Error decoding declared identity %s in " + "network-status document.", escaped(id_hexdigest)); + goto err; + } + if (!(v = networkstatus_get_voter_by_id(ns, declared_identity))) { + log_warn(LD_DIR, "ID on signature on network-status document does " + "not match any declared directory source."); + goto err; + } + sig = tor_malloc_zero(sizeof(document_signature_t)); + memcpy(sig->identity_digest, v->identity_digest, DIGEST_LEN); + sig->alg = alg; + if (strlen(sk_hexdigest) != HEX_DIGEST_LEN || + base16_decode(sig->signing_key_digest, sizeof(sig->signing_key_digest), + sk_hexdigest, HEX_DIGEST_LEN) + != sizeof(sig->signing_key_digest)) { + log_warn(LD_DIR, "Error decoding declared signing key digest %s in " + "network-status document.", escaped(sk_hexdigest)); + tor_free(sig); + goto err; + } + + if (ns->type != NS_TYPE_CONSENSUS) { + if (tor_memneq(declared_identity, ns->cert->cache_info.identity_digest, + DIGEST_LEN)) { + log_warn(LD_DIR, "Digest mismatch between declared and actual on " + "network-status vote."); + tor_free(sig); + goto err; + } + } + + if (networkstatus_get_voter_sig_by_alg(v, sig->alg)) { + /* We already parsed a vote with this algorithm from this voter. Use the + first one. */ + log_fn(LOG_PROTOCOL_WARN, LD_DIR, "We received a networkstatus " + "that contains two signatures from the same voter with the same " + "algorithm. Ignoring the second signature."); + tor_free(sig); + continue; + } + + if (ns->type != NS_TYPE_CONSENSUS) { + if (check_signature_token(ns_digests.d[DIGEST_SHA1], DIGEST_LEN, + tok, ns->cert->signing_key, 0, + "network-status document")) { + tor_free(sig); + goto err; + } + sig->good_signature = 1; + } else { + if (tok->object_size >= INT_MAX || tok->object_size >= SIZE_T_CEILING) { + tor_free(sig); + goto err; + } + sig->signature = tor_memdup(tok->object_body, tok->object_size); + sig->signature_len = (int) tok->object_size; + } + smartlist_add(v->sigs, sig); + + ++n_signatures; + } SMARTLIST_FOREACH_END(_tok); + + if (! n_signatures) { + log_warn(LD_DIR, "No signatures on networkstatus document."); + goto err; + } else if (ns->type == NS_TYPE_VOTE && n_signatures != 1) { + log_warn(LD_DIR, "Received more than one signature on a " + "network-status vote."); + goto err; + } + + if (eos_out) + *eos_out = end_of_footer; + + goto done; + err: + dump_desc(s_dup, "v3 networkstatus"); + networkstatus_vote_free(ns); + ns = NULL; + done: + if (tokens) { + SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); + smartlist_free(tokens); + } + if (voter) { + if (voter->sigs) { + SMARTLIST_FOREACH(voter->sigs, document_signature_t *, sig, + document_signature_free(sig)); + smartlist_free(voter->sigs); + } + tor_free(voter->nickname); + tor_free(voter->address); + tor_free(voter->contact); + tor_free(voter); + } + if (rs_tokens) { + SMARTLIST_FOREACH(rs_tokens, directory_token_t *, t, token_clear(t)); + smartlist_free(rs_tokens); + } + if (footer_tokens) { + SMARTLIST_FOREACH(footer_tokens, directory_token_t *, t, token_clear(t)); + smartlist_free(footer_tokens); + } + if (area) { + DUMP_AREA(area, "v3 networkstatus"); + memarea_drop_all(area); + } + if (rs_area) + memarea_drop_all(rs_area); + tor_free(last_kwd); + + return ns; +} diff --cc src/feature/dirparse/ns_parse.h index 22438d73a,000000000..85d9ded68 mode 100644,000000..100644 --- a/src/feature/dirparse/ns_parse.h +++ b/src/feature/dirparse/ns_parse.h @@@ -1,45 -1,0 +1,47 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2018, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file ns_parse.h + * \brief Header file for ns_parse.c. + **/ + +#ifndef TOR_NS_PARSE_H +#define TOR_NS_PARSE_H + - int router_get_networkstatus_v3_hashes(const char *s, ++int router_get_networkstatus_v3_hashes(const char *s, size_t len, + common_digests_t *digests); - int router_get_networkstatus_v3_signed_boundaries(const char *s, ++int router_get_networkstatus_v3_signed_boundaries(const char *s, size_t len, + const char **start_out, + const char **end_out); +int router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, - const char *s); ++ const char *s, size_t len); +int compare_vote_routerstatus_entries(const void **_a, const void **_b); + +int networkstatus_verify_bw_weights(networkstatus_t *ns, int); +enum networkstatus_type_t; +networkstatus_t *networkstatus_parse_vote_from_string(const char *s, ++ size_t len, + const char **eos_out, + enum networkstatus_type_t ns_type); + +#ifdef NS_PARSE_PRIVATE +STATIC int routerstatus_parse_guardfraction(const char *guardfraction_str, + networkstatus_t *vote, + vote_routerstatus_t *vote_rs, + routerstatus_t *rs); +struct memarea_t; +STATIC routerstatus_t *routerstatus_parse_entry_from_string( + struct memarea_t *area, - const char **s, smartlist_t *tokens, ++ const char **s, const char *eos, ++ smartlist_t *tokens, + networkstatus_t *vote, + vote_routerstatus_t *vote_rs, + int consensus_method, + consensus_flavor_t flav); +#endif + +#endif diff --cc src/feature/nodelist/authcert.c index b111422d0,000000000..2c4915e91 mode 100644,000000..100644 --- a/src/feature/nodelist/authcert.c +++ b/src/feature/nodelist/authcert.c @@@ -1,1208 -1,0 +1,1209 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2018, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file authcert.c + * \brief Code to maintain directory authorities' certificates. + * + * Authority certificates are signed with authority identity keys; they + * are used to authenticate shorter-term authority signing keys. We + * fetch them when we find a consensus or a vote that has been signed + * with a signing key we don't recognize. We cache them on disk and + * load them on startup. Authority operators generate them with the + * "tor-gencert" utility. + */ + +#include "core/or/or.h" + +#include "app/config/config.h" +#include "core/mainloop/connection.h" +#include "core/mainloop/mainloop.h" +#include "core/or/policies.h" +#include "feature/client/bridges.h" +#include "feature/dirauth/authmode.h" +#include "feature/dirclient/dirclient.h" +#include "feature/dirclient/dlstatus.h" +#include "feature/dircommon/directory.h" +#include "feature/dircommon/fp_pair.h" +#include "feature/dirparse/authcert_parse.h" +#include "feature/nodelist/authcert.h" +#include "feature/nodelist/dirlist.h" +#include "feature/nodelist/networkstatus.h" +#include "feature/nodelist/node_select.h" +#include "feature/nodelist/nodelist.h" +#include "feature/nodelist/routerlist.h" +#include "feature/relay/routermode.h" + +#include "core/or/connection_st.h" +#include "feature/dirclient/dir_server_st.h" +#include "feature/dircommon/dir_connection_st.h" +#include "feature/nodelist/authority_cert_st.h" +#include "feature/nodelist/document_signature_st.h" +#include "feature/nodelist/networkstatus_st.h" +#include "feature/nodelist/networkstatus_voter_info_st.h" +#include "feature/nodelist/node_st.h" + +DECLARE_TYPED_DIGESTMAP_FNS(dsmap_, digest_ds_map_t, download_status_t) +#define DSMAP_FOREACH(map, keyvar, valvar) \ + DIGESTMAP_FOREACH(dsmap_to_digestmap(map), keyvar, download_status_t *, \ + valvar) +#define dsmap_free(map, fn) MAP_FREE_AND_NULL(dsmap, (map), (fn)) + +/* Forward declaration for cert_list_t */ +typedef struct cert_list_t cert_list_t; + +static void download_status_reset_by_sk_in_cl(cert_list_t *cl, + const char *digest); +static int download_status_is_ready_by_sk_in_cl(cert_list_t *cl, + const char *digest, + time_t now); +static void list_pending_fpsk_downloads(fp_pair_map_t *result); + +/** List of certificates for a single authority, and download status for + * latest certificate. + */ +struct cert_list_t { + /* + * The keys of download status map are cert->signing_key_digest for pending + * downloads by (identity digest/signing key digest) pair; functions such + * as authority_cert_get_by_digest() already assume these are unique. + */ + struct digest_ds_map_t *dl_status_map; + /* There is also a dlstatus for the download by identity key only */ + download_status_t dl_status_by_id; + smartlist_t *certs; +}; +/** Map from v3 identity key digest to cert_list_t. */ +static digestmap_t *trusted_dir_certs = NULL; + +/** True iff any key certificate in at least one member of + * trusted_dir_certs has changed since we last flushed the + * certificates to disk. */ +static int trusted_dir_servers_certs_changed = 0; + +/** Initialise schedule, want_authority, and increment_on in the download + * status dlstatus, then call download_status_reset() on it. + * It is safe to call this function or download_status_reset() multiple times + * on a new dlstatus. But it should *not* be called after a dlstatus has been + * used to count download attempts or failures. */ +static void +download_status_cert_init(download_status_t *dlstatus) +{ + dlstatus->schedule = DL_SCHED_CONSENSUS; + dlstatus->want_authority = DL_WANT_ANY_DIRSERVER; + dlstatus->increment_on = DL_SCHED_INCREMENT_FAILURE; + dlstatus->last_backoff_position = 0; + dlstatus->last_delay_used = 0; + + /* Use the new schedule to set next_attempt_at */ + download_status_reset(dlstatus); +} + +/** Reset the download status of a specified element in a dsmap */ +static void +download_status_reset_by_sk_in_cl(cert_list_t *cl, const char *digest) +{ + download_status_t *dlstatus = NULL; + + tor_assert(cl); + tor_assert(digest); + + /* Make sure we have a dsmap */ + if (!(cl->dl_status_map)) { + cl->dl_status_map = dsmap_new(); + } + /* Look for a download_status_t in the map with this digest */ + dlstatus = dsmap_get(cl->dl_status_map, digest); + /* Got one? */ + if (!dlstatus) { + /* Insert before we reset */ + dlstatus = tor_malloc_zero(sizeof(*dlstatus)); + dsmap_set(cl->dl_status_map, digest, dlstatus); + download_status_cert_init(dlstatus); + } + tor_assert(dlstatus); + /* Go ahead and reset it */ + download_status_reset(dlstatus); +} + +/** + * Return true if the download for this signing key digest in cl is ready + * to be re-attempted. + */ +static int +download_status_is_ready_by_sk_in_cl(cert_list_t *cl, + const char *digest, + time_t now) +{ + int rv = 0; + download_status_t *dlstatus = NULL; + + tor_assert(cl); + tor_assert(digest); + + /* Make sure we have a dsmap */ + if (!(cl->dl_status_map)) { + cl->dl_status_map = dsmap_new(); + } + /* Look for a download_status_t in the map with this digest */ + dlstatus = dsmap_get(cl->dl_status_map, digest); + /* Got one? */ + if (dlstatus) { + /* Use download_status_is_ready() */ + rv = download_status_is_ready(dlstatus, now); + } else { + /* + * If we don't know anything about it, return 1, since we haven't + * tried this one before. We need to create a new entry here, + * too. + */ + dlstatus = tor_malloc_zero(sizeof(*dlstatus)); + download_status_cert_init(dlstatus); + dsmap_set(cl->dl_status_map, digest, dlstatus); + rv = 1; + } + + return rv; +} + +/** Helper: Return the cert_list_t for an authority whose authority ID is + * id_digest, allocating a new list if necessary. */ +static cert_list_t * +get_cert_list(const char *id_digest) +{ + cert_list_t *cl; + if (!trusted_dir_certs) + trusted_dir_certs = digestmap_new(); + cl = digestmap_get(trusted_dir_certs, id_digest); + if (!cl) { + cl = tor_malloc_zero(sizeof(cert_list_t)); + download_status_cert_init(&cl->dl_status_by_id); + cl->certs = smartlist_new(); + cl->dl_status_map = dsmap_new(); + digestmap_set(trusted_dir_certs, id_digest, cl); + } + return cl; +} + +/** Return a list of authority ID digests with potentially enumerable lists + * of download_status_t objects; used by controller GETINFO queries. + */ + +MOCK_IMPL(smartlist_t *, +list_authority_ids_with_downloads, (void)) +{ + smartlist_t *ids = smartlist_new(); + digestmap_iter_t *i; + const char *digest; + char *tmp; + void *cl; + + if (trusted_dir_certs) { + for (i = digestmap_iter_init(trusted_dir_certs); + !(digestmap_iter_done(i)); + i = digestmap_iter_next(trusted_dir_certs, i)) { + /* + * We always have at least dl_status_by_id to query, so no need to + * probe deeper than the existence of a cert_list_t. + */ + digestmap_iter_get(i, &digest, &cl); + tmp = tor_malloc(DIGEST_LEN); + memcpy(tmp, digest, DIGEST_LEN); + smartlist_add(ids, tmp); + } + } + /* else definitely no downloads going since nothing even has a cert list */ + + return ids; +} + +/** Given an authority ID digest, return a pointer to the default download + * status, or NULL if there is no such entry in trusted_dir_certs */ + +MOCK_IMPL(download_status_t *, +id_only_download_status_for_authority_id, (const char *digest)) +{ + download_status_t *dl = NULL; + cert_list_t *cl; + + if (trusted_dir_certs) { + cl = digestmap_get(trusted_dir_certs, digest); + if (cl) { + dl = &(cl->dl_status_by_id); + } + } + + return dl; +} + +/** Given an authority ID digest, return a smartlist of signing key digests + * for which download_status_t is potentially queryable, or NULL if no such + * authority ID digest is known. */ + +MOCK_IMPL(smartlist_t *, +list_sk_digests_for_authority_id, (const char *digest)) +{ + smartlist_t *sks = NULL; + cert_list_t *cl; + dsmap_iter_t *i; + const char *sk_digest; + char *tmp; + download_status_t *dl; + + if (trusted_dir_certs) { + cl = digestmap_get(trusted_dir_certs, digest); + if (cl) { + sks = smartlist_new(); + if (cl->dl_status_map) { + for (i = dsmap_iter_init(cl->dl_status_map); + !(dsmap_iter_done(i)); + i = dsmap_iter_next(cl->dl_status_map, i)) { + /* Pull the digest out and add it to the list */ + dsmap_iter_get(i, &sk_digest, &dl); + tmp = tor_malloc(DIGEST_LEN); + memcpy(tmp, sk_digest, DIGEST_LEN); + smartlist_add(sks, tmp); + } + } + } + } + + return sks; +} + +/** Given an authority ID digest and a signing key digest, return the + * download_status_t or NULL if none exists. */ + +MOCK_IMPL(download_status_t *, +download_status_for_authority_id_and_sk,(const char *id_digest, + const char *sk_digest)) +{ + download_status_t *dl = NULL; + cert_list_t *cl = NULL; + + if (trusted_dir_certs) { + cl = digestmap_get(trusted_dir_certs, id_digest); + if (cl && cl->dl_status_map) { + dl = dsmap_get(cl->dl_status_map, sk_digest); + } + } + + return dl; +} + +#define cert_list_free(val) \ + FREE_AND_NULL(cert_list_t, cert_list_free_, (val)) + +/** Release all space held by a cert_list_t */ +static void +cert_list_free_(cert_list_t *cl) +{ + if (!cl) + return; + + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, + authority_cert_free(cert)); + smartlist_free(cl->certs); + dsmap_free(cl->dl_status_map, tor_free_); + tor_free(cl); +} + +/** Wrapper for cert_list_free so we can pass it to digestmap_free */ +static void +cert_list_free_void(void *cl) +{ + cert_list_free_(cl); +} + +/** Reload the cached v3 key certificates from the cached-certs file in + * the data directory. Return 0 on success, -1 on failure. */ +int +trusted_dirs_reload_certs(void) +{ + char *filename; + char *contents; + int r; + + filename = get_cachedir_fname("cached-certs"); + contents = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL); + tor_free(filename); + if (!contents) + return 0; + r = trusted_dirs_load_certs_from_string( + contents, + TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1, NULL); + tor_free(contents); + return r; +} + +/** Helper: return true iff we already have loaded the exact cert + * cert. */ +static inline int +already_have_cert(authority_cert_t *cert) +{ + cert_list_t *cl = get_cert_list(cert->cache_info.identity_digest); + + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c, + { + if (tor_memeq(c->cache_info.signed_descriptor_digest, + cert->cache_info.signed_descriptor_digest, + DIGEST_LEN)) + return 1; + }); + return 0; +} + +/** Load a bunch of new key certificates from the string contents. If + * source is TRUSTED_DIRS_CERTS_SRC_FROM_STORE, the certificates are + * from the cache, and we don't need to flush them to disk. If we are a + * dirauth loading our own cert, source is TRUSTED_DIRS_CERTS_SRC_SELF. + * Otherwise, source is download type: TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST + * or TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST. If flush is true, we + * need to flush any changed certificates to disk now. Return 0 on success, + * -1 if any certs fail to parse. + * + * If source_dir is non-NULL, it's the identity digest for a directory that + * we've just successfully retrieved certificates from, so try it first to + * fetch any missing certificates. + */ +int +trusted_dirs_load_certs_from_string(const char *contents, int source, + int flush, const char *source_dir) +{ + dir_server_t *ds; + const char *s, *eos; + int failure_code = 0; + int from_store = (source == TRUSTED_DIRS_CERTS_SRC_FROM_STORE); + int added_trusted_cert = 0; + + for (s = contents; *s; s = eos) { - authority_cert_t *cert = authority_cert_parse_from_string(s, &eos); ++ authority_cert_t *cert = authority_cert_parse_from_string(s, strlen(s), ++ &eos); + cert_list_t *cl; + if (!cert) { + failure_code = -1; + break; + } + ds = trusteddirserver_get_by_v3_auth_digest( + cert->cache_info.identity_digest); + log_debug(LD_DIR, "Parsed certificate for %s", + ds ? ds->nickname : "unknown authority"); + + if (already_have_cert(cert)) { + /* we already have this one. continue. */ + log_info(LD_DIR, "Skipping %s certificate for %s that we " + "already have.", + from_store ? "cached" : "downloaded", + ds ? ds->nickname : "an old or new authority"); + + /* + * A duplicate on download should be treated as a failure, so we call + * authority_cert_dl_failed() to reset the download status to make sure + * we can't try again. Since we've implemented the fp-sk mechanism + * to download certs by signing key, this should be much rarer than it + * was and is perhaps cause for concern. + */ + if (!from_store) { + if (authdir_mode(get_options())) { + log_warn(LD_DIR, + "Got a certificate for %s, but we already have it. " + "Maybe they haven't updated it. Waiting for a while.", + ds ? ds->nickname : "an old or new authority"); + } else { + log_info(LD_DIR, + "Got a certificate for %s, but we already have it. " + "Maybe they haven't updated it. Waiting for a while.", + ds ? ds->nickname : "an old or new authority"); + } + + /* + * This is where we care about the source; authority_cert_dl_failed() + * needs to know whether the download was by fp or (fp,sk) pair to + * twiddle the right bit in the download map. + */ + if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST) { + authority_cert_dl_failed(cert->cache_info.identity_digest, + NULL, 404); + } else if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST) { + authority_cert_dl_failed(cert->cache_info.identity_digest, + cert->signing_key_digest, 404); + } + } + + authority_cert_free(cert); + continue; + } + + if (ds) { + added_trusted_cert = 1; + log_info(LD_DIR, "Adding %s certificate for directory authority %s with " + "signing key %s", from_store ? "cached" : "downloaded", + ds->nickname, hex_str(cert->signing_key_digest,DIGEST_LEN)); + } else { + int adding = we_want_to_fetch_unknown_auth_certs(get_options()); + log_info(LD_DIR, "%s %s certificate for unrecognized directory " + "authority with signing key %s", + adding ? "Adding" : "Not adding", + from_store ? "cached" : "downloaded", + hex_str(cert->signing_key_digest,DIGEST_LEN)); + if (!adding) { + authority_cert_free(cert); + continue; + } + } + + cl = get_cert_list(cert->cache_info.identity_digest); + smartlist_add(cl->certs, cert); + if (ds && cert->cache_info.published_on > ds->addr_current_at) { + /* Check to see whether we should update our view of the authority's + * address. */ + if (cert->addr && cert->dir_port && + (ds->addr != cert->addr || + ds->dir_port != cert->dir_port)) { + char *a = tor_dup_ip(cert->addr); + log_notice(LD_DIR, "Updating address for directory authority %s " + "from %s:%d to %s:%d based on certificate.", + ds->nickname, ds->address, (int)ds->dir_port, + a, cert->dir_port); + tor_free(a); + ds->addr = cert->addr; + ds->dir_port = cert->dir_port; + } + ds->addr_current_at = cert->cache_info.published_on; + } + + if (!from_store) + trusted_dir_servers_certs_changed = 1; + } + + if (flush) + trusted_dirs_flush_certs_to_disk(); + + /* call this even if failure_code is <0, since some certs might have + * succeeded, but only pass source_dir if there were no failures, + * and at least one more authority certificate was added to the store. + * This avoids retrying a directory that's serving bad or entirely duplicate + * certificates. */ + if (failure_code == 0 && added_trusted_cert) { + networkstatus_note_certs_arrived(source_dir); + } else { + networkstatus_note_certs_arrived(NULL); + } + + return failure_code; +} + +/** Save all v3 key certificates to the cached-certs file. */ +void +trusted_dirs_flush_certs_to_disk(void) +{ + char *filename; + smartlist_t *chunks; + + if (!trusted_dir_servers_certs_changed || !trusted_dir_certs) + return; + + chunks = smartlist_new(); + DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) { + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, + { + sized_chunk_t *c = tor_malloc(sizeof(sized_chunk_t)); + c->bytes = cert->cache_info.signed_descriptor_body; + c->len = cert->cache_info.signed_descriptor_len; + smartlist_add(chunks, c); + }); + } DIGESTMAP_FOREACH_END; + + filename = get_cachedir_fname("cached-certs"); + if (write_chunks_to_file(filename, chunks, 0, 0)) { + log_warn(LD_FS, "Error writing certificates to disk."); + } + tor_free(filename); + SMARTLIST_FOREACH(chunks, sized_chunk_t *, c, tor_free(c)); + smartlist_free(chunks); + + trusted_dir_servers_certs_changed = 0; +} + +static int +compare_certs_by_pubdates(const void **_a, const void **_b) +{ + const authority_cert_t *cert1 = *_a, *cert2=*_b; + + if (cert1->cache_info.published_on < cert2->cache_info.published_on) + return -1; + else if (cert1->cache_info.published_on > cert2->cache_info.published_on) + return 1; + else + return 0; +} + +/** Remove all expired v3 authority certificates that have been superseded for + * more than 48 hours or, if not expired, that were published more than 7 days + * before being superseded. (If the most recent cert was published more than 48 + * hours ago, then we aren't going to get any consensuses signed with older + * keys.) */ +void +trusted_dirs_remove_old_certs(void) +{ + time_t now = time(NULL); +#define DEAD_CERT_LIFETIME (2*24*60*60) +#define SUPERSEDED_CERT_LIFETIME (2*24*60*60) + if (!trusted_dir_certs) + return; + + DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) { + /* Sort the list from first-published to last-published */ + smartlist_sort(cl->certs, compare_certs_by_pubdates); + + SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) { + if (cert_sl_idx == smartlist_len(cl->certs) - 1) { + /* This is the most recently published cert. Keep it. */ + continue; + } + authority_cert_t *next_cert = smartlist_get(cl->certs, cert_sl_idx+1); + const time_t next_cert_published = next_cert->cache_info.published_on; + if (next_cert_published > now) { + /* All later certs are published in the future. Keep everything + * we didn't discard. */ + break; + } + int should_remove = 0; + if (cert->expires + DEAD_CERT_LIFETIME < now) { + /* Certificate has been expired for at least DEAD_CERT_LIFETIME. + * Remove it. */ + should_remove = 1; + } else if (next_cert_published + SUPERSEDED_CERT_LIFETIME < now) { + /* Certificate has been superseded for OLD_CERT_LIFETIME. + * Remove it. + */ + should_remove = 1; + } + if (should_remove) { + SMARTLIST_DEL_CURRENT_KEEPORDER(cl->certs, cert); + authority_cert_free(cert); + trusted_dir_servers_certs_changed = 1; + } + } SMARTLIST_FOREACH_END(cert); + + } DIGESTMAP_FOREACH_END; +#undef DEAD_CERT_LIFETIME +#undef OLD_CERT_LIFETIME + + trusted_dirs_flush_certs_to_disk(); +} + +/** Return the newest v3 authority certificate whose v3 authority identity key + * has digest id_digest. Return NULL if no such authority is known, + * or it has no certificate. */ +authority_cert_t * +authority_cert_get_newest_by_id(const char *id_digest) +{ + cert_list_t *cl; + authority_cert_t *best = NULL; + if (!trusted_dir_certs || + !(cl = digestmap_get(trusted_dir_certs, id_digest))) + return NULL; + + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, + { + if (!best || cert->cache_info.published_on > best->cache_info.published_on) + best = cert; + }); + return best; +} + +/** Return the newest v3 authority certificate whose directory signing key has + * digest sk_digest. Return NULL if no such certificate is known. + */ +authority_cert_t * +authority_cert_get_by_sk_digest(const char *sk_digest) +{ + authority_cert_t *c; + if (!trusted_dir_certs) + return NULL; + + if ((c = get_my_v3_authority_cert()) && + tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN)) + return c; + if ((c = get_my_v3_legacy_cert()) && + tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN)) + return c; + + DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) { + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, + { + if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN)) + return cert; + }); + } DIGESTMAP_FOREACH_END; + return NULL; +} + +/** Return the v3 authority certificate with signing key matching + * sk_digest, for the authority with identity digest id_digest. + * Return NULL if no such authority is known. */ +authority_cert_t * +authority_cert_get_by_digests(const char *id_digest, + const char *sk_digest) +{ + cert_list_t *cl; + if (!trusted_dir_certs || + !(cl = digestmap_get(trusted_dir_certs, id_digest))) + return NULL; + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, + if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN)) + return cert; ); + + return NULL; +} + +/** Add every known authority_cert_t to certs_out. */ +void +authority_cert_get_all(smartlist_t *certs_out) +{ + tor_assert(certs_out); + if (!trusted_dir_certs) + return; + + DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) { + SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c, + smartlist_add(certs_out, c)); + } DIGESTMAP_FOREACH_END; +} + +/** Called when an attempt to download a certificate with the authority with + * ID id_digest and, if not NULL, signed with key signing_key_digest + * fails with HTTP response code status: remember the failure, so we + * don't try again immediately. */ +void +authority_cert_dl_failed(const char *id_digest, + const char *signing_key_digest, int status) +{ + cert_list_t *cl; + download_status_t *dlstatus = NULL; + char id_digest_str[2*DIGEST_LEN+1]; + char sk_digest_str[2*DIGEST_LEN+1]; + + if (!trusted_dir_certs || + !(cl = digestmap_get(trusted_dir_certs, id_digest))) + return; + + /* + * Are we noting a failed download of the latest cert for the id digest, + * or of a download by (id, signing key) digest pair? + */ + if (!signing_key_digest) { + /* Just by id digest */ + download_status_failed(&cl->dl_status_by_id, status); + } else { + /* Reset by (id, signing key) digest pair + * + * Look for a download_status_t in the map with this digest + */ + dlstatus = dsmap_get(cl->dl_status_map, signing_key_digest); + /* Got one? */ + if (dlstatus) { + download_status_failed(dlstatus, status); + } else { + /* + * Do this rather than hex_str(), since hex_str clobbers + * old results and we call twice in the param list. + */ + base16_encode(id_digest_str, sizeof(id_digest_str), + id_digest, DIGEST_LEN); + base16_encode(sk_digest_str, sizeof(sk_digest_str), + signing_key_digest, DIGEST_LEN); + log_warn(LD_BUG, + "Got failure for cert fetch with (fp,sk) = (%s,%s), with " + "status %d, but knew nothing about the download.", + id_digest_str, sk_digest_str, status); + } + } +} + +static const char *BAD_SIGNING_KEYS[] = { + "09CD84F751FD6E955E0F8ADB497D5401470D697E", // Expires 2015-01-11 16:26:31 + "0E7E9C07F0969D0468AD741E172A6109DC289F3C", // Expires 2014-08-12 10:18:26 + "57B85409891D3FB32137F642FDEDF8B7F8CDFDCD", // Expires 2015-02-11 17:19:09 + "87326329007AF781F587AF5B594E540B2B6C7630", // Expires 2014-07-17 11:10:09 + "98CC82342DE8D298CF99D3F1A396475901E0D38E", // Expires 2014-11-10 13:18:56 + "9904B52336713A5ADCB13E4FB14DC919E0D45571", // Expires 2014-04-20 20:01:01 + "9DCD8E3F1DD1597E2AD476BBA28A1A89F3095227", // Expires 2015-01-16 03:52:30 + "A61682F34B9BB9694AC98491FE1ABBFE61923941", // Expires 2014-06-11 09:25:09 + "B59F6E99C575113650C99F1C425BA7B20A8C071D", // Expires 2014-07-31 13:22:10 + "D27178388FA75B96D37FA36E0B015227DDDBDA51", // Expires 2014-08-04 04:01:57 + NULL, +}; + +/** Return true iff cert authenticates some atuhority signing key + * which, because of the old openssl heartbleed vulnerability, should + * never be trusted. */ +int +authority_cert_is_blacklisted(const authority_cert_t *cert) +{ + char hex_digest[HEX_DIGEST_LEN+1]; + int i; + base16_encode(hex_digest, sizeof(hex_digest), + cert->signing_key_digest, sizeof(cert->signing_key_digest)); + + for (i = 0; BAD_SIGNING_KEYS[i]; ++i) { + if (!strcasecmp(hex_digest, BAD_SIGNING_KEYS[i])) { + return 1; + } + } + return 0; +} + +/** Return true iff when we've been getting enough failures when trying to + * download the certificate with ID digest id_digest that we're willing + * to start bugging the user about it. */ +int +authority_cert_dl_looks_uncertain(const char *id_digest) +{ +#define N_AUTH_CERT_DL_FAILURES_TO_BUG_USER 2 + cert_list_t *cl; + int n_failures; + if (!trusted_dir_certs || + !(cl = digestmap_get(trusted_dir_certs, id_digest))) + return 0; + + n_failures = download_status_get_n_failures(&cl->dl_status_by_id); + return n_failures >= N_AUTH_CERT_DL_FAILURES_TO_BUG_USER; +} + +/* Fetch the authority certificates specified in resource. + * If we are a bridge client, and node is a configured bridge, fetch from node + * using dir_hint as the fingerprint. Otherwise, if rs is not NULL, fetch from + * rs. Otherwise, fetch from a random directory mirror. */ +static void +authority_certs_fetch_resource_impl(const char *resource, + const char *dir_hint, + const node_t *node, + const routerstatus_t *rs) +{ + const or_options_t *options = get_options(); + int get_via_tor = purpose_needs_anonymity(DIR_PURPOSE_FETCH_CERTIFICATE, 0, + resource); + + /* Make sure bridge clients never connect to anything but a bridge */ + if (options->UseBridges) { + if (node && !node_is_a_configured_bridge(node)) { + /* If we're using bridges, and node is not a bridge, use a 3-hop path. */ + get_via_tor = 1; + } else if (!node) { + /* If we're using bridges, and there's no node, use a 3-hop path. */ + get_via_tor = 1; + } + } + + const dir_indirection_t indirection = get_via_tor ? DIRIND_ANONYMOUS + : DIRIND_ONEHOP; + + directory_request_t *req = NULL; + /* If we've just downloaded a consensus from a bridge, re-use that + * bridge */ + if (options->UseBridges && node && node->ri && !get_via_tor) { + /* clients always make OR connections to bridges */ + tor_addr_port_t or_ap; + /* we are willing to use a non-preferred address if we need to */ + fascist_firewall_choose_address_node(node, FIREWALL_OR_CONNECTION, 0, + &or_ap); + + req = directory_request_new(DIR_PURPOSE_FETCH_CERTIFICATE); + directory_request_set_or_addr_port(req, &or_ap); + if (dir_hint) + directory_request_set_directory_id_digest(req, dir_hint); + } else if (rs) { + /* And if we've just downloaded a consensus from a directory, re-use that + * directory */ + req = directory_request_new(DIR_PURPOSE_FETCH_CERTIFICATE); + directory_request_set_routerstatus(req, rs); + } + + if (req) { + /* We've set up a request object -- fill in the other request fields, and + * send the request. */ + directory_request_set_indirection(req, indirection); + directory_request_set_resource(req, resource); + directory_initiate_request(req); + directory_request_free(req); + return; + } + + /* Otherwise, we want certs from a random fallback or directory + * mirror, because they will almost always succeed. */ + directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0, + resource, PDS_RETRY_IF_NO_SERVERS, + DL_WANT_ANY_DIRSERVER); +} + +/** Try to download any v3 authority certificates that we may be missing. If + * status is provided, try to get all the ones that were used to sign + * status. Additionally, try to have a non-expired certificate for + * every V3 authority in trusted_dir_servers. Don't fetch certificates we + * already have. + * + * If dir_hint is non-NULL, it's the identity digest for a directory that + * we've just successfully retrieved a consensus or certificates from, so try + * it first to fetch any missing certificates. + **/ +void +authority_certs_fetch_missing(networkstatus_t *status, time_t now, + const char *dir_hint) +{ + /* + * The pending_id digestmap tracks pending certificate downloads by + * identity digest; the pending_cert digestmap tracks pending downloads + * by (identity digest, signing key digest) pairs. + */ + digestmap_t *pending_id; + fp_pair_map_t *pending_cert; + /* + * The missing_id_digests smartlist will hold a list of id digests + * we want to fetch the newest cert for; the missing_cert_digests + * smartlist will hold a list of fp_pair_t with an identity and + * signing key digest. + */ + smartlist_t *missing_cert_digests, *missing_id_digests; + char *resource = NULL; + cert_list_t *cl; + const or_options_t *options = get_options(); + const int keep_unknown = we_want_to_fetch_unknown_auth_certs(options); + fp_pair_t *fp_tmp = NULL; + char id_digest_str[2*DIGEST_LEN+1]; + char sk_digest_str[2*DIGEST_LEN+1]; + + if (should_delay_dir_fetches(options, NULL)) + return; + + pending_cert = fp_pair_map_new(); + pending_id = digestmap_new(); + missing_cert_digests = smartlist_new(); + missing_id_digests = smartlist_new(); + + /* + * First, we get the lists of already pending downloads so we don't + * duplicate effort. + */ + list_pending_downloads(pending_id, NULL, + DIR_PURPOSE_FETCH_CERTIFICATE, "fp/"); + list_pending_fpsk_downloads(pending_cert); + + /* + * Now, we download any trusted authority certs we don't have by + * identity digest only. This gets the latest cert for that authority. + */ + SMARTLIST_FOREACH_BEGIN(router_get_trusted_dir_servers(), + dir_server_t *, ds) { + int found = 0; + if (!(ds->type & V3_DIRINFO)) + continue; + if (smartlist_contains_digest(missing_id_digests, + ds->v3_identity_digest)) + continue; + cl = get_cert_list(ds->v3_identity_digest); + SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) { + if (now < cert->expires) { + /* It's not expired, and we weren't looking for something to + * verify a consensus with. Call it done. */ + download_status_reset(&(cl->dl_status_by_id)); + /* No sense trying to download it specifically by signing key hash */ + download_status_reset_by_sk_in_cl(cl, cert->signing_key_digest); + found = 1; + break; + } + } SMARTLIST_FOREACH_END(cert); + if (!found && + download_status_is_ready(&(cl->dl_status_by_id), now) && + !digestmap_get(pending_id, ds->v3_identity_digest)) { + log_info(LD_DIR, + "No current certificate known for authority %s " + "(ID digest %s); launching request.", + ds->nickname, hex_str(ds->v3_identity_digest, DIGEST_LEN)); + smartlist_add(missing_id_digests, ds->v3_identity_digest); + } + } SMARTLIST_FOREACH_END(ds); + + /* + * Next, if we have a consensus, scan through it and look for anything + * signed with a key from a cert we don't have. Those get downloaded + * by (fp,sk) pair, but if we don't know any certs at all for the fp + * (identity digest), and it's one of the trusted dir server certs + * we started off above or a pending download in pending_id, don't + * try to get it yet. Most likely, the one we'll get for that will + * have the right signing key too, and we'd just be downloading + * redundantly. + */ + if (status) { + SMARTLIST_FOREACH_BEGIN(status->voters, networkstatus_voter_info_t *, + voter) { + if (!smartlist_len(voter->sigs)) + continue; /* This authority never signed this consensus, so don't + * go looking for a cert with key digest 0000000000. */ + if (!keep_unknown && + !trusteddirserver_get_by_v3_auth_digest(voter->identity_digest)) + continue; /* We don't want unknown certs, and we don't know this + * authority.*/ + + /* + * If we don't know *any* cert for this authority, and a download by ID + * is pending or we added it to missing_id_digests above, skip this + * one for now to avoid duplicate downloads. + */ + cl = get_cert_list(voter->identity_digest); + if (smartlist_len(cl->certs) == 0) { + /* We have no certs at all for this one */ + + /* Do we have a download of one pending? */ + if (digestmap_get(pending_id, voter->identity_digest)) + continue; + + /* + * Are we about to launch a download of one due to the trusted + * dir server check above? + */ + if (smartlist_contains_digest(missing_id_digests, + voter->identity_digest)) + continue; + } + + SMARTLIST_FOREACH_BEGIN(voter->sigs, document_signature_t *, sig) { + authority_cert_t *cert = + authority_cert_get_by_digests(voter->identity_digest, + sig->signing_key_digest); + if (cert) { + if (now < cert->expires) + download_status_reset_by_sk_in_cl(cl, sig->signing_key_digest); + continue; + } + if (download_status_is_ready_by_sk_in_cl( + cl, sig->signing_key_digest, now) && + !fp_pair_map_get_by_digests(pending_cert, + voter->identity_digest, + sig->signing_key_digest)) { + /* + * Do this rather than hex_str(), since hex_str clobbers + * old results and we call twice in the param list. + */ + base16_encode(id_digest_str, sizeof(id_digest_str), + voter->identity_digest, DIGEST_LEN); + base16_encode(sk_digest_str, sizeof(sk_digest_str), + sig->signing_key_digest, DIGEST_LEN); + + if (voter->nickname) { + log_info(LD_DIR, + "We're missing a certificate from authority %s " + "(ID digest %s) with signing key %s: " + "launching request.", + voter->nickname, id_digest_str, sk_digest_str); + } else { + log_info(LD_DIR, + "We're missing a certificate from authority ID digest " + "%s with signing key %s: launching request.", + id_digest_str, sk_digest_str); + } + + /* Allocate a new fp_pair_t to append */ + fp_tmp = tor_malloc(sizeof(*fp_tmp)); + memcpy(fp_tmp->first, voter->identity_digest, sizeof(fp_tmp->first)); + memcpy(fp_tmp->second, sig->signing_key_digest, + sizeof(fp_tmp->second)); + smartlist_add(missing_cert_digests, fp_tmp); + } + } SMARTLIST_FOREACH_END(sig); + } SMARTLIST_FOREACH_END(voter); + } + + /* Bridge clients look up the node for the dir_hint */ + const node_t *node = NULL; + /* All clients, including bridge clients, look up the routerstatus for the + * dir_hint */ + const routerstatus_t *rs = NULL; + + /* If we still need certificates, try the directory that just successfully + * served us a consensus or certificates. + * As soon as the directory fails to provide additional certificates, we try + * another, randomly selected directory. This avoids continual retries. + * (We only ever have one outstanding request per certificate.) + */ + if (dir_hint) { + if (options->UseBridges) { + /* Bridge clients try the nodelist. If the dir_hint is from an authority, + * or something else fetched over tor, we won't find the node here, but + * we will find the rs. */ + node = node_get_by_id(dir_hint); + } + + /* All clients try the consensus routerstatus, then the fallback + * routerstatus */ + rs = router_get_consensus_status_by_id(dir_hint); + if (!rs) { + /* This will also find authorities */ + const dir_server_t *ds = router_get_fallback_dirserver_by_digest( + dir_hint); + if (ds) { + rs = &ds->fake_status; + } + } + + if (!node && !rs) { + log_warn(LD_BUG, "Directory %s delivered a consensus, but %s" + "no routerstatus could be found for it.", + options->UseBridges ? "no node and " : "", + hex_str(dir_hint, DIGEST_LEN)); + } + } + + /* Do downloads by identity digest */ + if (smartlist_len(missing_id_digests) > 0) { + int need_plus = 0; + smartlist_t *fps = smartlist_new(); + + smartlist_add_strdup(fps, "fp/"); + + SMARTLIST_FOREACH_BEGIN(missing_id_digests, const char *, d) { + char *fp = NULL; + + if (digestmap_get(pending_id, d)) + continue; + + base16_encode(id_digest_str, sizeof(id_digest_str), + d, DIGEST_LEN); + + if (need_plus) { + tor_asprintf(&fp, "+%s", id_digest_str); + } else { + /* No need for tor_asprintf() in this case; first one gets no '+' */ + fp = tor_strdup(id_digest_str); + need_plus = 1; + } + + smartlist_add(fps, fp); + } SMARTLIST_FOREACH_END(d); + + if (smartlist_len(fps) > 1) { + resource = smartlist_join_strings(fps, "", 0, NULL); + /* node and rs are directories that just gave us a consensus or + * certificates */ + authority_certs_fetch_resource_impl(resource, dir_hint, node, rs); + tor_free(resource); + } + /* else we didn't add any: they were all pending */ + + SMARTLIST_FOREACH(fps, char *, cp, tor_free(cp)); + smartlist_free(fps); + } + + /* Do downloads by identity digest/signing key pair */ + if (smartlist_len(missing_cert_digests) > 0) { + int need_plus = 0; + smartlist_t *fp_pairs = smartlist_new(); + + smartlist_add_strdup(fp_pairs, "fp-sk/"); + + SMARTLIST_FOREACH_BEGIN(missing_cert_digests, const fp_pair_t *, d) { + char *fp_pair = NULL; + + if (fp_pair_map_get(pending_cert, d)) + continue; + + /* Construct string encodings of the digests */ + base16_encode(id_digest_str, sizeof(id_digest_str), + d->first, DIGEST_LEN); + base16_encode(sk_digest_str, sizeof(sk_digest_str), + d->second, DIGEST_LEN); + + /* Now tor_asprintf() */ + if (need_plus) { + tor_asprintf(&fp_pair, "+%s-%s", id_digest_str, sk_digest_str); + } else { + /* First one in the list doesn't get a '+' */ + tor_asprintf(&fp_pair, "%s-%s", id_digest_str, sk_digest_str); + need_plus = 1; + } + + /* Add it to the list of pairs to request */ + smartlist_add(fp_pairs, fp_pair); + } SMARTLIST_FOREACH_END(d); + + if (smartlist_len(fp_pairs) > 1) { + resource = smartlist_join_strings(fp_pairs, "", 0, NULL); + /* node and rs are directories that just gave us a consensus or + * certificates */ + authority_certs_fetch_resource_impl(resource, dir_hint, node, rs); + tor_free(resource); + } + /* else they were all pending */ + + SMARTLIST_FOREACH(fp_pairs, char *, p, tor_free(p)); + smartlist_free(fp_pairs); + } + + smartlist_free(missing_id_digests); + SMARTLIST_FOREACH(missing_cert_digests, fp_pair_t *, p, tor_free(p)); + smartlist_free(missing_cert_digests); + digestmap_free(pending_id, NULL); + fp_pair_map_free(pending_cert, NULL); +} + +void +authcert_free_all(void) +{ + if (trusted_dir_certs) { + digestmap_free(trusted_dir_certs, cert_list_free_void); + trusted_dir_certs = NULL; + } +} + +/** Free storage held in cert. */ +void +authority_cert_free_(authority_cert_t *cert) +{ + if (!cert) + return; + + tor_free(cert->cache_info.signed_descriptor_body); + crypto_pk_free(cert->signing_key); + crypto_pk_free(cert->identity_key); + + tor_free(cert); +} + +/** For every certificate we are currently downloading by (identity digest, + * signing key digest) pair, set result[fp_pair] to (void *1). + */ +static void +list_pending_fpsk_downloads(fp_pair_map_t *result) +{ + const char *pfx = "fp-sk/"; + smartlist_t *tmp; + smartlist_t *conns; + const char *resource; + + tor_assert(result); + + tmp = smartlist_new(); + conns = get_connection_array(); + + SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) { + if (conn->type == CONN_TYPE_DIR && + conn->purpose == DIR_PURPOSE_FETCH_CERTIFICATE && + !conn->marked_for_close) { + resource = TO_DIR_CONN(conn)->requested_resource; + if (!strcmpstart(resource, pfx)) + dir_split_resource_into_fingerprint_pairs(resource + strlen(pfx), + tmp); + } + } SMARTLIST_FOREACH_END(conn); + + SMARTLIST_FOREACH_BEGIN(tmp, fp_pair_t *, fp) { + fp_pair_map_set(result, fp, (void*)1); + tor_free(fp); + } SMARTLIST_FOREACH_END(fp); + + smartlist_free(tmp); +} diff --cc src/feature/nodelist/networkstatus.c index de2451b79,97a8779be..ec1a69b9e --- a/src/feature/nodelist/networkstatus.c +++ b/src/feature/nodelist/networkstatus.c @@@ -2109,14 -2106,14 +2117,15 @@@ networkstatus_set_current_consensus(con } if (we_want_to_fetch_flavor(options, flav)) { - dirserv_set_cached_consensus_networkstatus(consensus, - consensus_len, - flavor, - &c->digests, - c->digest_sha3_as_signed, - c->valid_after); if (dir_server_mode(get_options())) { + dirserv_set_cached_consensus_networkstatus(consensus, ++ consensus_len, + flavor, + &c->digests, + c->digest_sha3_as_signed, + c->valid_after); + - consdiffmgr_add_consensus(consensus, c); + consdiffmgr_add_consensus(consensus, consensus_len, c); } }

1 0

[tor/master] Fix remaining cases of using consensus without a len parameter.
by nickm＠torproject.org 31 Oct '18

31 Oct '18

commit 594140574e7366efac693d440a636a1e1cce82ff Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Oct 24 11:06:34 2018 -0400 Fix remaining cases of using consensus without a len parameter. (Thanks to cyberpunks for noting two of them!) --- src/feature/dircache/consdiffmgr.c | 28 ++++++++++++++++++++++++---- src/feature/dircache/consdiffmgr.h | 6 ++++++ src/feature/dircache/dirserv.c | 5 ++++- src/feature/dircache/dirserv.h | 1 + src/feature/nodelist/networkstatus.c | 5 +++-- src/test/test_consdiffmgr.c | 2 ++ src/test/test_dir_handle_get.c | 2 ++ 7 files changed, 42 insertions(+), 7 deletions(-) diff --git a/src/feature/dircache/consdiffmgr.c b/src/feature/dircache/consdiffmgr.c index bf3a0ef3c..2cddf68b6 100644 --- a/src/feature/dircache/consdiffmgr.c +++ b/src/feature/dircache/consdiffmgr.c @@ -189,6 +189,7 @@ static consdiff_cfg_t consdiff_cfg = { static int consdiffmgr_ensure_space_for_files(int n); static int consensus_queue_compression_work(const char *consensus, + size_t consensus_len, const networkstatus_t *as_parsed); static int consensus_diff_queue_diff_work(consensus_cache_entry_t *diff_from, consensus_cache_entry_t *diff_to); @@ -509,8 +510,25 @@ get_max_age_to_cache(void) MAX_MAX_AGE_TO_CACHE); } +#ifdef TOR_UNIT_TESTS +/** As consdiffmgr_add_consensus, but requires a nul-terminated input. For + * testing. */ +int +consdiffmgr_add_consensus_nulterm(const char *consensus, + const networkstatus_t *as_parsed) +{ + size_t len = strlen(consensus); + /* make a non-nul-terminated copy so that we can have a better chance + * of catching errors. */ + char *ctmp = tor_memdup(consensus, len); + int r = consdiffmgr_add_consensus(ctmp, len, as_parsed); + tor_free(ctmp); + return r; +} +#endif + /** - * Given a string containing a networkstatus consensus, and the results of + * Given a buffer containing a networkstatus consensus, and the results of * having parsed that consensus, add that consensus to the cache if it is not * already present and not too old. Create new consensus diffs from or to * that consensus as appropriate. @@ -519,6 +537,7 @@ get_max_age_to_cache(void) */ int consdiffmgr_add_consensus(const char *consensus, + size_t consensus_len, const networkstatus_t *as_parsed) { if (BUG(consensus == NULL) || BUG(as_parsed == NULL)) @@ -544,7 +563,7 @@ consdiffmgr_add_consensus(const char *consensus, } /* We don't have it. Add it to the cache. */ - return consensus_queue_compression_work(consensus, as_parsed); + return consensus_queue_compression_work(consensus, consensus_len, as_parsed); } /** @@ -1826,14 +1845,15 @@ static int background_compression = 0; */ static int consensus_queue_compression_work(const char *consensus, + size_t consensus_len, const networkstatus_t *as_parsed) { tor_assert(consensus); tor_assert(as_parsed); consensus_compress_worker_job_t *job = tor_malloc_zero(sizeof(*job)); - job->consensus = tor_strdup(consensus); - job->consensus_len = strlen(consensus); + job->consensus = tor_memdup_nulterm(consensus, consensus_len); + job->consensus_len = strlen(job->consensus); job->flavor = as_parsed->flavor; char va_str[ISO_TIME_LEN+1]; diff --git a/src/feature/dircache/consdiffmgr.h b/src/feature/dircache/consdiffmgr.h index d6f273cc4..011c8799d 100644 --- a/src/feature/dircache/consdiffmgr.h +++ b/src/feature/dircache/consdiffmgr.h @@ -22,6 +22,7 @@ typedef struct consdiff_cfg_t { struct consensus_cache_entry_t; // from conscache.h int consdiffmgr_add_consensus(const char *consensus, + size_t consensus_len, const networkstatus_t *as_parsed); consdiff_status_t consdiffmgr_find_consensus( @@ -73,4 +74,9 @@ STATIC int uncompress_or_set_ptr(const char **out, size_t *outlen, consensus_cache_entry_t *ent); #endif /* defined(CONSDIFFMGR_PRIVATE) */ +#ifdef TOR_UNIT_TESTS +int consdiffmgr_add_consensus_nulterm(const char *consensus, + const networkstatus_t *as_parsed); +#endif + #endif /* !defined(TOR_CONSDIFFMGR_H) */ diff --git a/src/feature/dircache/dirserv.c b/src/feature/dircache/dirserv.c index b85db8324..433d3f4ce 100644 --- a/src/feature/dircache/dirserv.c +++ b/src/feature/dircache/dirserv.c @@ -1272,6 +1272,7 @@ free_cached_dir_(void *_d) * validation is performed. */ void dirserv_set_cached_consensus_networkstatus(const char *networkstatus, + size_t networkstatus_len, const char *flavor_name, const common_digests_t *digests, const uint8_t *sha3_as_signed, @@ -1282,7 +1283,9 @@ dirserv_set_cached_consensus_networkstatus(const char *networkstatus, if (!cached_consensuses) cached_consensuses = strmap_new(); - new_networkstatus = new_cached_dir(tor_strdup(networkstatus), published); + new_networkstatus = + new_cached_dir(tor_memdup_nulterm(networkstatus, networkstatus_len), + published); memcpy(&new_networkstatus->digests, digests, sizeof(common_digests_t)); memcpy(&new_networkstatus->digest_sha3_as_signed, sha3_as_signed, DIGEST256_LEN); diff --git a/src/feature/dircache/dirserv.h b/src/feature/dircache/dirserv.h index 9be4bf9db..c430987aa 100644 --- a/src/feature/dircache/dirserv.h +++ b/src/feature/dircache/dirserv.h @@ -148,6 +148,7 @@ int directory_too_idle_to_fetch_descriptors(const or_options_t *options, cached_dir_t *dirserv_get_consensus(const char *flavor_name); void dirserv_set_cached_consensus_networkstatus(const char *consensus, + size_t consensus_len, const char *flavor_name, const common_digests_t *digests, const uint8_t *sha3_as_signed, diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c index 847ca0cdf..97a8779be 100644 --- a/src/feature/nodelist/networkstatus.c +++ b/src/feature/nodelist/networkstatus.c @@ -2107,17 +2107,18 @@ networkstatus_set_current_consensus(const char *consensus, if (we_want_to_fetch_flavor(options, flav)) { dirserv_set_cached_consensus_networkstatus(consensus, + consensus_len, flavor, &c->digests, c->digest_sha3_as_signed, c->valid_after); if (dir_server_mode(get_options())) { - consdiffmgr_add_consensus(consensus, c); + consdiffmgr_add_consensus(consensus, consensus_len, c); } } if (!from_cache) { - write_str_to_file(consensus_fname, consensus, 0); + write_bytes_to_file(consensus_fname, consensus, consensus_len, 0); } warn_early_consensus(c, flavor, now); diff --git a/src/test/test_consdiffmgr.c b/src/test/test_consdiffmgr.c index 4b49fdb6a..966314be1 100644 --- a/src/test/test_consdiffmgr.c +++ b/src/test/test_consdiffmgr.c @@ -21,6 +21,8 @@ #include "test/test.h" #include "test/log_test_helpers.h" +#define consdiffmgr_add_consensus consdiffmgr_add_consensus_nulterm + static char * consensus_diff_apply_(const char *c, const char *d) { diff --git a/src/test/test_dir_handle_get.c b/src/test/test_dir_handle_get.c index ecb7c1b5f..b59139691 100644 --- a/src/test/test_dir_handle_get.c +++ b/src/test/test_dir_handle_get.c @@ -67,6 +67,8 @@ ENABLE_GCC_WARNING(overlength-strings) #define NOT_ENOUGH_CONSENSUS_SIGNATURES "HTTP/1.0 404 " \ "Consensus not signed by sufficient number of requested authorities\r\n\r\n" +#define consdiffmgr_add_consensus consdiffmgr_add_consensus_nulterm + static dir_connection_t * new_dir_conn(void) {

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tor-commits October 2018