tor-commits March 2011

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[tor/maint-0.2.2] Do not serve encrypt-only descriptors with the "all" request. Reported by piebeer
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit bcbc8c51cbc026e73e831f6641f5d1fd6ebebd9d Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Mar 3 23:51:07 2011 -0500 Do not serve encrypt-only descriptors with the "all" request. Reported by piebeer --- src/or/dirserv.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/src/or/dirserv.c b/src/or/dirserv.c index 1649bd7..7db6c19 100644 --- a/src/or/dirserv.c +++ b/src/or/dirserv.c @@ -2699,6 +2699,8 @@ dirserv_get_routerdesc_fingerprints(smartlist_t *fps_out, const char *key, SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r, smartlist_add(fps_out, tor_memdup(r->cache_info.identity_digest, DIGEST_LEN))); + /* Treat "all" requests as if they were unencrypted */ + for_unencrypted_conn = 1; } else if (!strcmp(key, "authority")) { routerinfo_t *ri = router_get_my_routerinfo(); if (ri)

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[tor/maint-0.2.2] Revert "Disallow reject6 and accept6 lines in descriptors"
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit 3da0837b0b114bb320a244679325d25d664752c1 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:26:38 2011 -0500 Revert "Disallow reject6 and accept6 lines in descriptors" This reverts commit b3918b3bbbfa9097246d63746c8b540eff2ec8e8. --- src/or/routerparse.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/src/or/routerparse.c b/src/or/routerparse.c index d76b006..aa0687d 100644 --- a/src/or/routerparse.c +++ b/src/or/routerparse.c @@ -222,6 +222,8 @@ typedef struct token_rule_t { static token_rule_t routerdesc_token_table[] = { T0N("reject", K_REJECT, ARGS, NO_OBJ ), T0N("accept", K_ACCEPT, ARGS, NO_OBJ ), + T0N("reject6", K_REJECT6, ARGS, NO_OBJ ), + T0N("accept6", K_ACCEPT6, ARGS, NO_OBJ ), T1_START( "router", K_ROUTER, GE(5), NO_OBJ ), T1( "signing-key", K_SIGNING_KEY, NO_ARGS, NEED_KEY_1024 ), T1( "onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024 ),

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[tor/maint-0.2.1] Merge branch 'careful_with_all_descs' into maint-0.2.1
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit 0f637492e30e19ad7abeedafdd58c087f01b4527 Merge: 8b01fd7 b231026 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:35:42 2011 -0500 Merge branch 'careful_with_all_descs' into maint-0.2.1 changes/all_descs | 4 ++++ src/or/dirserv.c | 2 ++ 2 files changed, 6 insertions(+), 0 deletions(-)

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[tor/maint-0.2.1] Oops, here's the *REAL* fix for the ipv6 issue
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit 2ce132e335d60c7ef1d01aa00db5ab4c5b7d674f Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:31:06 2011 -0500 Oops, here's the *REAL* fix for the ipv6 issue We need to _REJECT_ descriptors with accept6/reject6 lines. If we let them onto the network , other un-upgraded tors will crash. --- changes/ipv6_crash | 5 +++-- src/or/routerparse.c | 6 ++++++ 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/changes/ipv6_crash b/changes/ipv6_crash index 2b04355..02f8aaa 100644 --- a/changes/ipv6_crash +++ b/changes/ipv6_crash @@ -1,3 +1,4 @@ - o Major bugfixes (directory authority) + o Major bugfixes: - Fix a crash in parsing router descriptors containing IPv6 - addresses. Bugfix on 0.2.1.3-alpha. + addresses. This one crashed the directory authorities when somebody + fired up some experimental code. Bugfix on 0.2.1.3-alpha. diff --git a/src/or/routerparse.c b/src/or/routerparse.c index aa0687d..1faa177 100644 --- a/src/or/routerparse.c +++ b/src/or/routerparse.c @@ -1369,6 +1369,12 @@ router_parse_entry_from_string(const char *s, const char *end, router->has_old_dnsworkers = 1; } + if (find_opt_by_keyword(tokens, K_REJECT6) || + find_opt_by_keyword(tokens, K_ACCEPT6)) { + log_warn(LD_DIR, "Rejecting router with reject6/accept6 line: they crash " + "older Tors."); + goto err; + } exit_policy_tokens = find_all_exitpolicy(tokens); if (!smartlist_len(exit_policy_tokens)) { log_warn(LD_DIR, "No exit policy tokens in descriptor.");

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[tor/maint-0.2.1] Revert "Disallow reject6 and accept6 lines in descriptors"
by nickm＠torproject.org 06 Mar '11

06 Mar '11

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[tor/maint-0.2.1] Do not serve encrypt-only descriptors with the "all" request. Reported by piebeer
by nickm＠torproject.org 06 Mar '11

06 Mar '11

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[tor/maint-0.2.1] changes file for careful_with_all_descs
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit b231026c42ea5cd884b4bde25cde3ba2c6e5ca98 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:35:24 2011 -0500 changes file for careful_with_all_descs --- changes/all_descs | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/changes/all_descs b/changes/all_descs new file mode 100644 index 0000000..10711b2 --- /dev/null +++ b/changes/all_descs @@ -0,0 +1,4 @@ + o Major bugfixes (bridge authority) + - Do not allow encrypte requests for "all" bridges to return all + bridges. +

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[tor/maint-0.2.1] Merge branch 'real_ipv6_fix' into maint-0.2.1
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit 4fa70e11ed93e8f2d67dfab6f64080a0d017e2d9 Merge: 0f63749 2ce132e Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:42:05 2011 -0500 Merge branch 'real_ipv6_fix' into maint-0.2.1 changes/ipv6_crash | 5 +++-- src/or/routerparse.c | 8 ++++++++ 2 files changed, 11 insertions(+), 2 deletions(-)

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[tor/maint-0.2.2] Changes file for ipv6 parsing issue
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit fb421c00052cfebda33c4d42346c7eeef30f865f Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:15:32 2011 -0500 Changes file for ipv6 parsing issue --- changes/ipv6_crash | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/changes/ipv6_crash b/changes/ipv6_crash new file mode 100644 index 0000000..2b04355 --- /dev/null +++ b/changes/ipv6_crash @@ -0,0 +1,3 @@ + o Major bugfixes (directory authority) + - Fix a crash in parsing router descriptors containing IPv6 + addresses. Bugfix on 0.2.1.3-alpha.

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[tor/maint-0.2.2] Merge remote branch 'origin/maint-0.2.1' into maint-0.2.2
by nickm＠torproject.org 06 Mar '11

06 Mar '11

commit ed14888e7e9ffb1877ddb7780b5033314d244fb3 Merge: 9f61450 8b01fd7 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Mar 6 13:20:21 2011 -0500 Merge remote branch 'origin/maint-0.2.1' into maint-0.2.2 Conflicts: src/or/policies.c changes/ipv6_crash | 3 +++ src/or/policies.c | 2 ++ 2 files changed, 5 insertions(+), 0 deletions(-) diff --combined src/or/policies.c index 38c2f7c,f8c36c7..e48f420 --- a/src/or/policies.c +++ b/src/or/policies.c @@@ -9,10 -9,6 +9,10 @@@ **/ #include "or.h" +#include "config.h" +#include "dirserv.h" +#include "policies.h" +#include "routerparse.h" #include "ht.h" /** Policy that addresses for incoming SOCKS connections must match. */ @@@ -348,8 -344,7 +348,8 @@@ validate_addr_policies(or_options_t *op *msg = NULL; if (policies_parse_exit_policy(options->ExitPolicy, &addr_policy, - options->ExitPolicyRejectPrivate, NULL)) + options->ExitPolicyRejectPrivate, NULL, + !options->BridgeRelay)) REJECT("Error in ExitPolicy entry."); /* The rest of these calls *append* to addr_policy. So don't actually @@@ -380,8 -375,14 +380,8 @@@ if (parse_addr_policy(options->ReachableDirAddresses, &addr_policy, ADDR_POLICY_ACCEPT)) REJECT("Error in ReachableDirAddresses entry."); - if (parse_addr_policy(options->AuthDirReject, &addr_policy, - ADDR_POLICY_REJECT)) - REJECT("Error in AuthDirReject entry."); - if (parse_addr_policy(options->AuthDirInvalid, &addr_policy, - ADDR_POLICY_REJECT)) - REJECT("Error in AuthDirInvalid entry."); -err: + err: addr_policy_list_free(addr_policy); return *msg ? -1 : 0; #undef REJECT @@@ -828,16 -829,14 +828,16 @@@ exit_policy_remove_redundancies(smartli "reject *:6346-6429,reject *:6699,reject *:6881-6999,accept *:*" /** Parse the exit policy cfg into the linked list *dest. If - * cfg doesn't end in an absolute accept or reject, add the default exit + * cfg doesn't end in an absolute accept or reject and if + * add_default_policy is true, add the default exit * policy afterwards. If rejectprivate is true, prepend * "reject private:*" to the policy. Return -1 if we can't parse cfg, * else return 0. */ int policies_parse_exit_policy(config_line_t *cfg, smartlist_t **dest, - int rejectprivate, const char *local_address) + int rejectprivate, const char *local_address, + int add_default_policy) { if (rejectprivate) { append_exit_policy_string(dest, "reject private:*"); @@@ -849,23 -848,13 +849,23 @@@ } if (parse_addr_policy(cfg, dest, -1)) return -1; - append_exit_policy_string(dest, DEFAULT_EXIT_POLICY); - + if (add_default_policy) + append_exit_policy_string(dest, DEFAULT_EXIT_POLICY); + else + append_exit_policy_string(dest, "reject *:*"); exit_policy_remove_redundancies(*dest); return 0; } +/** Add "reject *:*" to the end of the policy in *dest, allocating + * *dest as needed. */ +void +policies_exit_policy_append_reject_star(smartlist_t **dest) +{ + append_exit_policy_string(dest, "reject *:*"); +} + /** Replace the exit policy of r with reject *:*. */ void policies_set_router_exitpolicy_to_reject_all(routerinfo_t *r) @@@ -877,49 -866,6 +877,51 @@@ smartlist_add(r->exit_policy, item); } +/** Return 1 if there is at least one /8 subnet in policy that + * allows exiting to port. Otherwise, return 0. */ +static int +exit_policy_is_general_exit_helper(smartlist_t *policy, int port) +{ + uint32_t mask, ip, i; + /* Is this /8 rejected (1), or undecided (0)? */ + char subnet_status[256]; + + memset(subnet_status, 0, sizeof(subnet_status)); + SMARTLIST_FOREACH(policy, addr_policy_t *, p, { ++ if (tor_addr_family(&p->addr) != AF_INET) ++ continue; /* IPv4 only for now */ + if (p->prt_min > port || p->prt_max < port) + continue; /* Doesn't cover our port. */ + mask = 0; + tor_assert(p->maskbits <= 32); + + if (p->maskbits) + mask = UINT32_MAX<<(32-p->maskbits); + ip = tor_addr_to_ipv4h(&p->addr); + + /* Calculate the first and last subnet that this exit policy touches + * and set it as loop boundaries. */ + for (i = ((mask & ip)>>24); i <= (~((mask & ip) ^ mask)>>24); ++i) { + tor_addr_t addr; + if (subnet_status[i] != 0) + continue; /* We already reject some part of this /8 */ + tor_addr_from_ipv4h(&addr, i<<24); + if (tor_addr_is_internal(&addr, 0)) + continue; /* Local or non-routable addresses */ + if (p->policy_type == ADDR_POLICY_ACCEPT) { + if (p->maskbits > 8) + continue; /* Narrower than a /8. */ + /* We found an allowed subnet of at least size /8. Done + * for this port! */ + return 1; + } else if (p->policy_type == ADDR_POLICY_REJECT) { + subnet_status[i] = 1; + } + } + }); + return 0; +} + /** Return true iff ri is "useful as an exit node", meaning * it allows exit to at least one /8 address space for at least * two of ports 80, 443, and 6667. */ @@@ -933,7 -879,21 +935,7 @@@ exit_policy_is_general_exit(smartlist_ return 0; for (i = 0; i < 3; ++i) { - SMARTLIST_FOREACH(policy, addr_policy_t *, p, { - if (tor_addr_family(&p->addr) != AF_INET) - continue; /* IPv4 only for now */ - if (p->prt_min > ports[i] || p->prt_max < ports[i]) - continue; /* Doesn't cover our port. */ - if (p->maskbits > 8) - continue; /* Narrower than a /8. */ - if (tor_addr_is_loopback(&p->addr)) - continue; /* 127.x or ::1. */ - /* We have a match that is at least a /8. */ - if (p->policy_type == ADDR_POLICY_ACCEPT) { - ++n_allowed; - break; /* stop considering this port */ - } - }); + n_allowed += exit_policy_is_general_exit_helper(policy, ports[i]); } return n_allowed >= 2; } @@@ -1280,7 -1240,7 +1282,7 @@@ policy_summarize(smartlist_t *policy result = tor_malloc(final_size); tor_snprintf(result, final_size, "%s %s", prefix, shorter_str); -cleanup: + cleanup: /* cleanup */ SMARTLIST_FOREACH(summary, policy_summary_item_t *, s, tor_free(s)); smartlist_free(summary); @@@ -1300,11 -1260,9 +1302,11 @@@ * about "exit-policy/..." */ int getinfo_helper_policies(control_connection_t *conn, - const char *question, char **answer) + const char *question, char **answer, + const char **errmsg) { (void) conn; + (void) errmsg; if (!strcmp(question, "exit-policy/default")) { *answer = tor_strdup(DEFAULT_EXIT_POLICY); } @@@ -1315,8 -1273,7 +1317,8 @@@ void addr_policy_list_free(smartlist_t *lst) { - if (!lst) return; + if (!lst) + return; SMARTLIST_FOREACH(lst, addr_policy_t *, policy, addr_policy_free(policy)); smartlist_free(lst); } @@@ -1325,20 -1282,19 +1327,20 @@@ void addr_policy_free(addr_policy_t *p) { - if (p) { - if (--p->refcnt <= 0) { - if (p->is_canonical) { - policy_map_ent_t search, *found; - search.policy = p; - found = HT_REMOVE(policy_map, &policy_root, &search); - if (found) { - tor_assert(p == found->policy); - tor_free(found); - } + if (!p) + return; + + if (--p->refcnt <= 0) { + if (p->is_canonical) { + policy_map_ent_t search, *found; + search.policy = p; + found = HT_REMOVE(policy_map, &policy_root, &search); + if (found) { + tor_assert(p == found->policy); + tor_free(found); } - tor_free(p); } + tor_free(p); } }

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tor-commits March 2011