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Merge remote-tracking branch 'tor-github/pr/1136'

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This commit is contained in:
Nick Mathewson 2019-07-02 13:33:50 -04:00
commit fdbd139495
3 changed files with 23 additions and 6 deletions
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5
changes/bug30958 Normal file
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@ -0,0 +1,5 @@
o Minor bugfixes (statistics):
- Stop removing the ed25519 signature if the extra info file is too big.
If the signature data was removed, but the keyword was kept, this could
result in an unparseable extra info file. Fixes bug 30958;
bugfix on 0.2.7.2-alpha.

2
scripts/maint/practracker/exceptions.txt
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@ -225,7 +225,7 @@ problem function-size /src/feature/nodelist/routerlist.c:update_extrainfo_downlo
problem function-size /src/feature/relay/dns.c:dns_resolve_impl() 134
problem function-size /src/feature/relay/dns.c:configure_nameservers() 161
problem function-size /src/feature/relay/dns.c:evdns_callback() 109
problem file-size /src/feature/relay/router.c 3510
problem file-size /src/feature/relay/router.c 3522
problem include-count /src/feature/relay/router.c 56
problem function-size /src/feature/relay/router.c:init_keys() 252
problem function-size /src/feature/relay/router.c:get_my_declared_family() 114

22
src/feature/relay/router.c
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@ -3158,6 +3158,8 @@ extrainfo_dump_to_string_header_helper(
ed_cert_line = tor_strdup("");
}
/* This is the first chunk in the file. If the file is too big, other chunks
* are removed. So we must only add one chunk here. */
tor_asprintf(&pre, "extra-info %s %s\n%spublished %s\n",
extrainfo->nickname, identity,
ed_cert_line,
@ -3187,6 +3189,10 @@ extrainfo_dump_to_string_stats_helper(smartlist_t *chunks,
char *contents = NULL;
time_t now = time(NULL);
/* If the file is too big, these chunks are removed, starting with the last
* chunk. So each chunk must be a complete line, and the file must be valid
* after each chunk. */
/* Add information about the pluggable transports we support, even if we
* are not publishing statistics. This information is needed by BridgeDB
* to distribute bridges. */
@ -3269,6 +3275,8 @@ extrainfo_dump_to_string_ed_sig_helper(
char buf[ED25519_SIG_BASE64_LEN+1];
int rv = -1;
/* These are two of the three final chunks in the file. If the file is too
* big, other chunks are removed. So we must only add two chunks here. */
smartlist_add_strdup(chunks, "router-sig-ed25519 ");
crypto_digest_smartlist_prefix(sha256_digest, DIGEST256_LEN,
ED_DESC_SIGNATURE_PREFIX,
@ -3362,17 +3370,21 @@ extrainfo_dump_to_string(char **s_out, extrainfo_t *extrainfo,
goto err;
}
/* This is one of the three final chunks in the file. If the file is too big,
* other chunks are removed. So we must only add one chunk here. */
smartlist_add_strdup(chunks, "router-signature\n");
s = smartlist_join_strings(chunks, "", 0, NULL);
while (strlen(s) > MAX_EXTRAINFO_UPLOAD_SIZE - DIROBJ_MAX_SIG_LEN) {
/* So long as there are at least two chunks (one for the initial
* extra-info line and one for the router-signature), we can keep removing
* things. */
if (smartlist_len(chunks) > 2) {
/* We remove the next-to-last element (remember, len-1 is the last
element), since we need to keep the router-signature element. */
int idx = smartlist_len(chunks) - 2;
* things. If emit_ed_sigs is true, we also keep 2 additional chunks at the
* end for the ed25519 signature. */
const int required_chunks = emit_ed_sigs ? 4 : 2;
if (smartlist_len(chunks) > required_chunks) {
/* We remove the next-to-last or 4th-last element (remember, len-1 is the
* last element), since we need to keep the router-signature elements. */
int idx = smartlist_len(chunks) - required_chunks;
char *e = smartlist_get(chunks, idx);
smartlist_del_keeporder(chunks, idx);
log_warn(LD_GENERAL, "We just generated an extra-info descriptor "