[tor-commits] [tor/maint-0.2.4] When downloading certificates, distinguish requesting by identity digest from requesting by ID digest, signing key pair; fixes bug 5595
andrea at torproject.org
andrea at torproject.org
Sat May 11 04:05:05 UTC 2013
commit fddb814feaa3d0091df03b26fa709cfba55312ed
Author: Andrea Shepard <andrea at torproject.org>
Date: Thu May 9 04:56:54 2013 -0700
When downloading certificates, distinguish requesting by identity digest from requesting by ID digest, signing key pair; fixes bug 5595
---
changes/bug5595 | 8 +
src/or/directory.c | 69 +++++++--
src/or/dirvote.c | 2 +-
src/or/router.c | 3 +-
src/or/routerlist.c | 427 ++++++++++++++++++++++++++++++++++++++++++---------
src/or/routerlist.h | 18 ++-
6 files changed, 436 insertions(+), 91 deletions(-)
diff --git a/changes/bug5595 b/changes/bug5595
new file mode 100644
index 0000000..31f4b84
--- /dev/null
+++ b/changes/bug5595
@@ -0,0 +1,8 @@
+ o Critical bugfixes:
+ - Distinguish downloading an authority certificate by identity digest from
+ downloading one by identity digest/signing key digest pair; formerly we
+ always request them only by identity digest and get the newest one even
+ when we wanted one with a different signing key. Then we would complain
+ about being given a certificate we already had, and never get the one we
+ really wanted. Now we use the "fp-sk/" resource as well as the "fp/"
+ resource to request the one we want. Fixes bug 5595.
diff --git a/src/or/directory.c b/src/or/directory.c
index f235bf3..8dd5a7c 100644
--- a/src/or/directory.c
+++ b/src/or/directory.c
@@ -809,13 +809,34 @@ connection_dir_download_cert_failed(dir_connection_t *conn, int status)
if (!conn->requested_resource)
return;
failed = smartlist_new();
- dir_split_resource_into_fingerprints(conn->requested_resource+3,
- failed, NULL, DSR_HEX);
- SMARTLIST_FOREACH(failed, char *, cp,
- {
- authority_cert_dl_failed(cp, status);
- tor_free(cp);
- });
+ /*
+ * We have two cases download by fingerprint (resource starts
+ * with "fp/") or download by fingerprint/signing key pair
+ * (resource starts with "fp-sk/").
+ */
+ if (!strcmpstart(conn->requested_resource, "fp/")) {
+ /* Download by fingerprint case */
+ dir_split_resource_into_fingerprints(conn->requested_resource + 3,
+ failed, NULL, DSR_HEX);
+ SMARTLIST_FOREACH_BEGIN(failed, char *, cp) {
+ /* Null signing key digest indicates download by fp only */
+ authority_cert_dl_failed(cp, NULL, status);
+ tor_free(cp);
+ } SMARTLIST_FOREACH_END(cp);
+ } else if (!strcmpstart(conn->requested_resource, "fp-sk/")) {
+ /* Download by (fp,sk) pairs */
+ dir_split_resource_into_fingerprint_pairs(conn->requested_resource + 5,
+ failed);
+ SMARTLIST_FOREACH_BEGIN(failed, fp_pair_t *, cp) {
+ authority_cert_dl_failed(cp->first, cp->second, status);
+ tor_free(cp);
+ } SMARTLIST_FOREACH_END(cp);
+ } else {
+ log_warn(LD_DIR,
+ "Don't know what to do with failure for cert fetch %s",
+ conn->requested_resource);
+ }
+
smartlist_free(failed);
update_certificate_downloads(time(NULL));
@@ -1589,6 +1610,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
conn->_base.purpose == DIR_PURPOSE_FETCH_MICRODESC);
int was_compressed=0;
time_t now = time(NULL);
+ int src_code;
switch (connection_fetch_from_buf_http(TO_CONN(conn),
&headers, MAX_HEADERS_SIZE,
@@ -1857,14 +1879,33 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
}
log_info(LD_DIR,"Received authority certificates (size %d) from server "
"'%s:%d'", (int)body_len, conn->_base.address, conn->_base.port);
- if (trusted_dirs_load_certs_from_string(body, 0, 1)<0) {
- log_warn(LD_DIR, "Unable to parse fetched certificates");
- /* if we fetched more than one and only some failed, the successful
- * ones got flushed to disk so it's safe to call this on them */
- connection_dir_download_cert_failed(conn, status_code);
+ /*
+ * Tell trusted_dirs_load_certs_from_string() whether it was by fp
+ * or fp-sk pair.
+ */
+ src_code = -1;
+ if (!strcmpstart(conn->requested_resource, "fp/")) {
+ src_code = TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST;
+ } else if (!strcmpstart(conn->requested_resource, "fp-sk/")) {
+ src_code = TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST;
+ }
+
+ if (src_code != -1) {
+ if (trusted_dirs_load_certs_from_string(body, src_code, 1)<0) {
+ log_warn(LD_DIR, "Unable to parse fetched certificates");
+ /* if we fetched more than one and only some failed, the successful
+ * ones got flushed to disk so it's safe to call this on them */
+ connection_dir_download_cert_failed(conn, status_code);
+ } else {
+ directory_info_has_arrived(now, 0);
+ log_info(LD_DIR, "Successfully loaded certificates from fetch.");
+ }
} else {
- directory_info_has_arrived(now, 0);
- log_info(LD_DIR, "Successfully loaded certificates from fetch.");
+ log_warn(LD_DIR,
+ "Couldn't figure out what to do with fetched certificates for "
+ "unknown resource %s",
+ conn->requested_resource);
+ connection_dir_download_cert_failed(conn, status_code);
}
}
if (conn->_base.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE) {
diff --git a/src/or/dirvote.c b/src/or/dirvote.c
index 144859a..959e05a 100644
--- a/src/or/dirvote.c
+++ b/src/or/dirvote.c
@@ -2947,7 +2947,7 @@ dirvote_add_vote(const char *vote_body, const char **msg_out, int *status_out)
/* Hey, it's a new cert! */
trusted_dirs_load_certs_from_string(
vote->cert->cache_info.signed_descriptor_body,
- 0 /* from_store */, 1 /*flush*/);
+ TRUSTED_DIRS_CERTS_SRC_FROM_VOTE, 1 /*flush*/);
if (!authority_cert_get_by_digests(vote->cert->cache_info.identity_digest,
vote->cert->signing_key_digest)) {
log_warn(LD_BUG, "We added a cert, but still couldn't find it.");
diff --git a/src/or/router.c b/src/or/router.c
index 1ace8e2..c68a309 100644
--- a/src/or/router.c
+++ b/src/or/router.c
@@ -758,7 +758,8 @@ init_keys(void)
if (cert) { /* add my own cert to the list of known certs */
log_info(LD_DIR, "adding my own v3 cert");
if (trusted_dirs_load_certs_from_string(
- cert->cache_info.signed_descriptor_body, 0, 0)<0) {
+ cert->cache_info.signed_descriptor_body,
+ TRUSTED_DIRS_CERTS_SRC_SELF, 0)<0) {
log_warn(LD_DIR, "Unable to parse my own v3 cert! Failing.");
return -1;
}
diff --git a/src/or/routerlist.c b/src/or/routerlist.c
index 3c39e36..20d5110 100644
--- a/src/or/routerlist.c
+++ b/src/or/routerlist.c
@@ -19,6 +19,7 @@
#include "directory.h"
#include "dirserv.h"
#include "dirvote.h"
+#include "fp_pair.h"
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
@@ -38,6 +39,24 @@
/****************************************************************************/
+DECLARE_TYPED_DIGESTMAP_FNS(sdmap_, digest_sd_map_t, signed_descriptor_t)
+DECLARE_TYPED_DIGESTMAP_FNS(rimap_, digest_ri_map_t, routerinfo_t)
+DECLARE_TYPED_DIGESTMAP_FNS(eimap_, digest_ei_map_t, extrainfo_t)
+DECLARE_TYPED_DIGESTMAP_FNS(dsmap_, digest_ds_map_t, download_status_t)
+#define SDMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(sdmap_to_digestmap(map), keyvar, signed_descriptor_t *, \
+ valvar)
+#define RIMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(rimap_to_digestmap(map), keyvar, routerinfo_t *, valvar)
+#define EIMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(eimap_to_digestmap(map), keyvar, extrainfo_t *, valvar)
+#define DSMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(dsmap_to_digestmap(map), keyvar, download_status_t *, \
+ valvar)
+
+/* Forward declaration for cert_list_t */
+typedef struct cert_list_t cert_list_t;
+
/* static function prototypes */
static const routerstatus_t *router_pick_directory_server_impl(
dirinfo_type_t auth, int flags);
@@ -56,19 +75,14 @@ static const char *signed_descriptor_get_body_impl(
int with_annotations);
static void list_pending_downloads(digestmap_t *result,
int purpose, const char *prefix);
+static void list_pending_fpsk_downloads(fp_pair_map_t *result);
static void launch_dummy_descriptor_download_as_needed(time_t now,
const or_options_t *options);
-
-DECLARE_TYPED_DIGESTMAP_FNS(sdmap_, digest_sd_map_t, signed_descriptor_t)
-DECLARE_TYPED_DIGESTMAP_FNS(rimap_, digest_ri_map_t, routerinfo_t)
-DECLARE_TYPED_DIGESTMAP_FNS(eimap_, digest_ei_map_t, extrainfo_t)
-#define SDMAP_FOREACH(map, keyvar, valvar) \
- DIGESTMAP_FOREACH(sdmap_to_digestmap(map), keyvar, signed_descriptor_t *, \
- valvar)
-#define RIMAP_FOREACH(map, keyvar, valvar) \
- DIGESTMAP_FOREACH(rimap_to_digestmap(map), keyvar, routerinfo_t *, valvar)
-#define EIMAP_FOREACH(map, keyvar, valvar) \
- DIGESTMAP_FOREACH(eimap_to_digestmap(map), keyvar, extrainfo_t *, valvar)
+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, int max_failures);
/****************************************************************************/
@@ -78,10 +92,17 @@ static smartlist_t *trusted_dir_servers = NULL;
/** List of for a given authority, and download status for latest certificate.
*/
-typedef struct cert_list_t {
- download_status_t dl_status;
+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;
-} cert_list_t;
+};
/** 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
@@ -125,6 +146,72 @@ get_n_authorities(dirinfo_type_t type)
return n;
}
+/** 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);
+ }
+ 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 max_failures)
+{
+ 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, max_failures);
+ } 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_reset(dlstatus);
+ dsmap_set(cl->dl_status_map, digest, dlstatus);
+ rv = 1;
+ }
+
+ return rv;
+}
+
#define get_n_v2_authorities() get_n_authorities(V2_DIRINFO)
/** Helper: Return the cert_list_t for an authority whose authority ID is
@@ -138,8 +225,9 @@ get_cert_list(const char *id_digest)
cl = digestmap_get(trusted_dir_certs, id_digest);
if (!cl) {
cl = tor_malloc_zero(sizeof(cert_list_t));
- cl->dl_status.schedule = DL_SCHED_CONSENSUS;
+ cl->dl_status_by_id.schedule = DL_SCHED_CONSENSUS;
cl->certs = smartlist_new();
+ cl->dl_status_map = dsmap_new();
digestmap_set(trusted_dir_certs, id_digest, cl);
}
return cl;
@@ -159,7 +247,9 @@ trusted_dirs_reload_certs(void)
tor_free(filename);
if (!contents)
return 0;
- r = trusted_dirs_load_certs_from_string(contents, 1, 1);
+ r = trusted_dirs_load_certs_from_string(
+ contents,
+ TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1);
tor_free(contents);
return r;
}
@@ -182,17 +272,23 @@ already_have_cert(authority_cert_t *cert)
}
/** Load a bunch of new key certificates from the string <b>contents</b>. If
- * <b>from_store</b> is true, the certificates are from the cache, and we
- * don't need to flush them to disk. If <b>flush</b> is true, we need
- * to flush any changed certificates to disk now. Return 0 on success, -1
- * if any certs fail to parse. */
+ * <b>source</b> 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 <b>flush</b> is true, we
+ * need to flush any changed certificates to disk now. Return 0 on success,
+ * -1 if any certs fail to parse.
+ */
+
int
-trusted_dirs_load_certs_from_string(const char *contents, int from_store,
+trusted_dirs_load_certs_from_string(const char *contents, int source,
int flush)
{
trusted_dir_server_t *ds;
const char *s, *eos;
int failure_code = 0;
+ int from_store = (source == TRUSTED_DIRS_CERTS_SRC_FROM_STORE);
for (s = contents; *s; s = eos) {
authority_cert_t *cert = authority_cert_parse_from_string(s, &eos);
@@ -229,7 +325,18 @@ trusted_dirs_load_certs_from_string(const char *contents, int from_store,
ds ? ds->nickname : "an old or new authority");
}
- authority_cert_dl_failed(cert->cache_info.identity_digest, 404);
+ /*
+ * 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);
@@ -445,17 +552,53 @@ authority_cert_get_all(smartlist_t *certs_out)
}
/** Called when an attempt to download a certificate with the authority with
- * ID <b>id_digest</b> fails with HTTP response code <b>status</b>: remember
- * the failure, so we don't try again immediately. */
+ * ID <b>id_digest</b> and, if not NULL, signed with key signing_key_digest
+ * fails with HTTP response code <b>status</b>: remember the failure, so we
+ * don't try again immediately. */
void
-authority_cert_dl_failed(const char *id_digest, int status)
+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;
- download_status_failed(&cl->dl_status, status);
+ /*
+ * 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_DIR,
+ "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);
+ }
+ }
}
/** Return true iff when we've been getting enough failures when trying to
@@ -471,7 +614,7 @@ authority_cert_dl_looks_uncertain(const char *id_digest)
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return 0;
- n_failures = download_status_get_n_failures(&cl->dl_status);
+ n_failures = download_status_get_n_failures(&cl->dl_status_by_id);
return n_failures >= N_AUTH_CERT_DL_FAILURES_TO_BUG_USER;
}
@@ -487,20 +630,38 @@ authority_cert_dl_looks_uncertain(const char *id_digest)
void
authority_certs_fetch_missing(networkstatus_t *status, time_t now)
{
- digestmap_t *pending;
+ /*
+ * 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;
authority_cert_t *cert;
- smartlist_t *missing_digests;
+ /*
+ * 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 int cache = directory_caches_unknown_auth_certs(get_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(get_options()))
return;
- pending = digestmap_new();
- missing_digests = smartlist_new();
+ pending_cert = fp_pair_map_new();
+ pending_id = digestmap_new();
+ missing_cert_digests = smartlist_new();
+ missing_id_digests = smartlist_new();
- list_pending_downloads(pending, DIR_PURPOSE_FETCH_CERTIFICATE, "fp/");
+ list_pending_downloads(pending_id, DIR_PURPOSE_FETCH_CERTIFICATE, "fp/");
+ list_pending_fpsk_downloads(pending_cert);
if (status) {
SMARTLIST_FOREACH_BEGIN(status->voters, networkstatus_voter_info_t *,
voter) {
@@ -516,16 +677,43 @@ authority_certs_fetch_missing(networkstatus_t *status, time_t now)
sig->signing_key_digest);
if (cert) {
if (now < cert->expires)
- download_status_reset(&cl->dl_status);
+ download_status_reset_by_sk_in_cl(cl, sig->signing_key_digest);
continue;
}
- if (download_status_is_ready(&cl->dl_status, now,
- MAX_CERT_DL_FAILURES) &&
- !digestmap_get(pending, voter->identity_digest)) {
- log_info(LD_DIR, "We're missing a certificate from authority "
- "with signing key %s: launching request.",
- hex_str(sig->signing_key_digest, DIGEST_LEN));
- smartlist_add(missing_digests, sig->identity_digest);
+ if (download_status_is_ready_by_sk_in_cl(
+ cl, sig->signing_key_digest,
+ now, MAX_CERT_DL_FAILURES) &&
+ !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);
@@ -534,60 +722,118 @@ authority_certs_fetch_missing(networkstatus_t *status, time_t now)
int found = 0;
if (!(ds->type & V3_DIRINFO))
continue;
- if (smartlist_digest_isin(missing_digests, ds->v3_identity_digest))
+ if (smartlist_digest_isin(missing_id_digests, ds->v3_identity_digest))
continue;
cl = get_cert_list(ds->v3_identity_digest);
SMARTLIST_FOREACH(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);
+ 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;
}
});
if (!found &&
- download_status_is_ready(&cl->dl_status, now,MAX_CERT_DL_FAILURES) &&
- !digestmap_get(pending, ds->v3_identity_digest)) {
- log_info(LD_DIR, "No current certificate known for authority %s; "
- "launching request.", ds->nickname);
- smartlist_add(missing_digests, ds->v3_identity_digest);
+ download_status_is_ready(&(cl->dl_status_by_id), now,
+ MAX_CERT_DL_FAILURES) &&
+ !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);
- if (!smartlist_len(missing_digests)) {
- goto done;
- } else {
+ /* Do downloads by identity digest */
+ if (smartlist_len(missing_id_digests) > 0) {
smartlist_t *fps = smartlist_new();
smartlist_add(fps, tor_strdup("fp/"));
- SMARTLIST_FOREACH(missing_digests, const char *, d, {
- char *fp;
- if (digestmap_get(pending, d))
- continue;
- fp = tor_malloc(HEX_DIGEST_LEN+2);
- base16_encode(fp, HEX_DIGEST_LEN+1, d, DIGEST_LEN);
- fp[HEX_DIGEST_LEN] = '+';
- fp[HEX_DIGEST_LEN+1] = '\0';
- smartlist_add(fps, fp);
- });
- if (smartlist_len(fps) == 1) {
- /* we didn't add any: they were all pending */
- SMARTLIST_FOREACH(fps, char *, cp, tor_free(cp));
- smartlist_free(fps);
- goto done;
+
+ SMARTLIST_FOREACH(missing_id_digests, const char *, d, {
+ char *fp;
+ if (digestmap_get(pending_id, d))
+ continue;
+ fp = tor_malloc(HEX_DIGEST_LEN+2);
+ base16_encode(fp, HEX_DIGEST_LEN+1, d, DIGEST_LEN);
+ fp[HEX_DIGEST_LEN] = '+';
+ fp[HEX_DIGEST_LEN+1] = '\0';
+ smartlist_add(fps, fp);
+ });
+
+ if (smartlist_len(fps) > 1) {
+ resource = smartlist_join_strings(fps, "", 0, NULL);
+ resource[strlen(resource)-1] = '\0';
+ directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
+ resource, PDS_RETRY_IF_NO_SERVERS);
+ tor_free(resource);
}
- resource = smartlist_join_strings(fps, "", 0, NULL);
- resource[strlen(resource)-1] = '\0';
+ /* else we didn't add any: they were all pending */
+
SMARTLIST_FOREACH(fps, char *, cp, tor_free(cp));
smartlist_free(fps);
}
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
- resource, PDS_RETRY_IF_NO_SERVERS);
- done:
- tor_free(resource);
- smartlist_free(missing_digests);
- digestmap_free(pending, NULL);
+ /* Do downloads by identity digest/signing key pair */
+ if (smartlist_len(missing_cert_digests) > 0) {
+ smartlist_t *fp_pairs = smartlist_new();
+ int need_plus = 0, offset = 0;
+
+ smartlist_add(fp_pairs, tor_strdup("fp-sk/"));
+
+ SMARTLIST_FOREACH_BEGIN(missing_cert_digests, const fp_pair_t *, d) {
+ char *fp_pair;
+
+ if (fp_pair_map_get(pending_cert, d))
+ continue;
+
+ fp_pair = tor_malloc(2*HEX_DIGEST_LEN+3);
+ offset = 0;
+ if (need_plus) {
+ fp_pair[offset++] = '+';
+ } else {
+ /* Prepend a '+' to all but the first in the list */
+ need_plus = 1;
+ }
+
+ /* Encode the first fingerprint */
+ base16_encode(fp_pair + offset, HEX_DIGEST_LEN+1,
+ d->first, DIGEST_LEN);
+ offset += HEX_DIGEST_LEN;
+ /* Add a '-' to separate them */
+ fp_pair[offset++] = '-';
+ /* Encode the second fingerprint */
+ base16_encode(fp_pair + offset, HEX_DIGEST_LEN+1,
+ d->second, DIGEST_LEN);
+ offset += HEX_DIGEST_LEN;
+ /* Add a NUL */
+ fp_pair[offset++] = '\0';
+
+ /* 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);
+ resource[strlen(resource)-1] = '\0';
+ directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
+ resource, PDS_RETRY_IF_NO_SERVERS);
+ 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);
}
/* Router descriptor storage.
@@ -4283,6 +4529,41 @@ list_pending_microdesc_downloads(digestmap_t *result)
list_pending_downloads(result, DIR_PURPOSE_FETCH_MICRODESC, "d/");
}
+/** 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);
+}
+
/** Launch downloads for all the descriptors whose digests or digests256
* are listed as digests[i] for lo <= i < hi. (Lo and hi may be out of
* range.) If <b>source</b> is given, download from <b>source</b>;
diff --git a/src/or/routerlist.h b/src/or/routerlist.h
index 8dcc6eb..ba6f930 100644
--- a/src/or/routerlist.h
+++ b/src/or/routerlist.h
@@ -13,7 +13,20 @@
int get_n_authorities(dirinfo_type_t type);
int trusted_dirs_reload_certs(void);
-int trusted_dirs_load_certs_from_string(const char *contents, int from_store,
+
+/*
+ * Pass one of these as source to trusted_dirs_load_certs_from_string()
+ * to indicate whence string originates; this controls error handling
+ * behavior such as marking downloads as failed.
+ */
+
+#define TRUSTED_DIRS_CERTS_SRC_SELF 0
+#define TRUSTED_DIRS_CERTS_SRC_FROM_STORE 1
+#define TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST 2
+#define TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST 3
+#define TRUSTED_DIRS_CERTS_SRC_FROM_VOTE 4
+
+int trusted_dirs_load_certs_from_string(const char *contents, int source,
int flush);
void trusted_dirs_flush_certs_to_disk(void);
authority_cert_t *authority_cert_get_newest_by_id(const char *id_digest);
@@ -21,7 +34,8 @@ authority_cert_t *authority_cert_get_by_sk_digest(const char *sk_digest);
authority_cert_t *authority_cert_get_by_digests(const char *id_digest,
const char *sk_digest);
void authority_cert_get_all(smartlist_t *certs_out);
-void authority_cert_dl_failed(const char *id_digest, int status);
+void authority_cert_dl_failed(const char *id_digest,
+ const char *signing_key_digest, int status);
void authority_certs_fetch_missing(networkstatus_t *status, time_t now);
int router_reload_router_list(void);
int authority_cert_dl_looks_uncertain(const char *id_digest);
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