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Fetch certificates from the same directory as previous certificates

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Improves the fix to #18963.
This commit is contained in:
teor (Tim Wilson-Brown) 2016-05-04 16:47:28 +10:00
parent 730cfeb6bd
commit cdb528d841
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GPG Key ID: 450CBA7F968F094B
9 changed files with 47 additions and 25 deletions
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5
changes/bug18963
View File

@ -1,4 +1,5 @@
o Minor bugfix (bootstrap):
- Remember the directory we fetched the consensus from, and use
it to fetch authority certificates as well.
- Remember the directory we fetched the consensus or previous
certificates from, and use it to fetch future authority
certificates.
Resolves ticket 18963; fix on #4483 in 0.2.8.1-alpha.

3
src/or/directory.c
View File

@ -2063,7 +2063,8 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
}
if (src_code != -1) {
if (trusted_dirs_load_certs_from_string(body, src_code, 1)<0) {
if (trusted_dirs_load_certs_from_string(body, src_code, 1,
conn->identity_digest)<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 */

3
src/or/dirvote.c
View File

@ -2916,7 +2916,8 @@ 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,
TRUSTED_DIRS_CERTS_SRC_FROM_VOTE, 1 /*flush*/);
TRUSTED_DIRS_CERTS_SRC_FROM_VOTE, 1 /*flush*/,
NULL);
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.");

15
src/or/networkstatus.c
View File

@ -1506,8 +1506,8 @@ networkstatus_set_current_consensus_from_ns(networkstatus_t *c,
* consensus, even if it comes from many days in the past.
*
* If source_dir is non-NULL, it's the identity digest for a directory that
* we've just successfully retrieved a consensus from, so try it first to
* fetch any missing certificates.
* we've just successfully retrieved a consensus or certificates from, so try
* it first to fetch any missing certificates.
*
* Return 0 on success, <0 on failure. On failure, caller should increment
* the failure count as appropriate.
@ -1802,9 +1802,14 @@ networkstatus_set_current_consensus(const char *consensus,
}
/** Called when we have gotten more certificates: see whether we can
* now verify a pending consensus. */
* now verify a pending consensus.
*
* 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.
*/
void
networkstatus_note_certs_arrived(void)
networkstatus_note_certs_arrived(const char *source_dir)
{
int i;
for (i=0; i<N_CONSENSUS_FLAVORS; ++i) {
@ -1817,7 +1822,7 @@ networkstatus_note_certs_arrived(void)
waiting_body,
networkstatus_get_flavor_name(i),
NSSET_WAS_WAITING_FOR_CERTS,
NULL)) {
source_dir)) {
tor_free(waiting_body);
}
}

2
src/or/networkstatus.h
View File

@ -87,7 +87,7 @@ int networkstatus_set_current_consensus(const char *consensus,
const char *flavor,
unsigned flags,
const char *source_dir);
void networkstatus_note_certs_arrived(void);
void networkstatus_note_certs_arrived(const char *source_dir);
void routers_update_all_from_networkstatus(time_t now, int dir_version);
void routers_update_status_from_consensus_networkstatus(smartlist_t *routers,
int reset_failures);

3
src/or/router.c
View File

@ -1054,7 +1054,8 @@ init_keys(void)
log_info(LD_DIR, "adding my own v3 cert");
if (trusted_dirs_load_certs_from_string(
cert->cache_info.signed_descriptor_body,
TRUSTED_DIRS_CERTS_SRC_SELF, 0)<0) {
TRUSTED_DIRS_CERTS_SRC_SELF, 0,
NULL)<0) {
log_warn(LD_DIR, "Unable to parse my own v3 cert! Failing.");
return -1;
}

25
src/or/routerlist.c
View File

@ -287,7 +287,7 @@ trusted_dirs_reload_certs(void)
return 0;
r = trusted_dirs_load_certs_from_string(
contents,
TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1);
TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1, NULL);
tor_free(contents);
return r;
}
@ -317,16 +317,21 @@ already_have_cert(authority_cert_t *cert)
* 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.
*
* 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)
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);
@ -386,6 +391,7 @@ trusted_dirs_load_certs_from_string(const char *contents, int source,
}
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));
@ -430,8 +436,15 @@ trusted_dirs_load_certs_from_string(const char *contents, int source,
trusted_dirs_flush_certs_to_disk();
/* call this even if failure_code is <0, since some certs might have
* succeeded. */
networkstatus_note_certs_arrived();
* 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;
}
@ -720,8 +733,8 @@ authority_cert_dl_looks_uncertain(const char *id_digest)
* already have.
*
* If dir_hint is non-NULL, it's the identity digest for a directory that
* we've just successfully retrieved a consensus from, so try it first to
* fetch any missing certificates.
* 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,

2
src/or/routerlist.h
View File

@ -29,7 +29,7 @@ int trusted_dirs_reload_certs(void);
#define TRUSTED_DIRS_CERTS_SRC_FROM_VOTE 4
int trusted_dirs_load_certs_from_string(const char *contents, int source,
int flush);
int flush, const char *source_dir);
void trusted_dirs_flush_certs_to_disk(void);
authority_cert_t *authority_cert_get_newest_by_id(const char *id_digest);
authority_cert_t *authority_cert_get_by_sk_digest(const char *sk_digest);

14
src/test/test_dir_handle_get.c
View File

@ -1237,7 +1237,7 @@ test_dir_handle_get_server_keys_all(void* data)
base16_decode(ds->v3_identity_digest, DIGEST_LEN,
TEST_CERT_IDENT_KEY, HEX_DIGEST_LEN);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
conn = dir_connection_new(tor_addr_family(&MOCK_TOR_ADDR));
@ -1396,7 +1396,7 @@ test_dir_handle_get_server_keys_fp(void* data)
TEST_CERT_IDENT_KEY, HEX_DIGEST_LEN);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
conn = dir_connection_new(tor_addr_family(&MOCK_TOR_ADDR));
char req[71];
@ -1468,7 +1468,7 @@ test_dir_handle_get_server_keys_sk(void* data)
routerlist_free_all();
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
conn = dir_connection_new(tor_addr_family(&MOCK_TOR_ADDR));
char req[71];
@ -1550,7 +1550,7 @@ test_dir_handle_get_server_keys_fpsk(void* data)
dir_server_add(ds);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
conn = dir_connection_new(tor_addr_family(&MOCK_TOR_ADDR));
@ -1606,7 +1606,7 @@ test_dir_handle_get_server_keys_busy(void* data)
dir_server_add(ds);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
MOCK(get_options, mock_get_options);
MOCK(connection_write_to_buf_impl_, connection_write_to_buf_mock);
@ -2344,7 +2344,7 @@ test_dir_handle_get_status_vote_next_authority(void* data)
base16_decode(ds->v3_identity_digest, DIGEST_LEN,
TEST_CERT_IDENT_KEY, HEX_DIGEST_LEN);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
init_mock_options();
mock_options->AuthoritativeDir = 1;
@ -2423,7 +2423,7 @@ test_dir_handle_get_status_vote_current_authority(void* data)
TEST_CERT_IDENT_KEY, HEX_DIGEST_LEN);
tt_int_op(0, OP_EQ, trusted_dirs_load_certs_from_string(TEST_CERTIFICATE,
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1));
TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST, 1, NULL));
init_mock_options();
mock_options->AuthoritativeDir = 1;