Merge branch 'maint-0.3.1' into release-0.3.1

This commit is contained in:
Nick Mathewson 2017-08-21 14:20:38 -04:00
commit 9944fd92ce
4 changed files with 262 additions and 2 deletions

4
changes/bug23233 Normal file
View File

@ -0,0 +1,4 @@
o Minor bugfixes (hidden service):
- Fix a BUG alert during HSv3 descriptor decoding that could trigger with a
specially crafted descriptor. Fixes bug #23233; bugfix on 0.3.0.1-alpha.
Bug found by "haxxpop".

View File

@ -1241,7 +1241,7 @@ cert_is_valid(tor_cert_t *cert, uint8_t type, const char *log_obj_type)
}
/* The following will not only check if the signature matches but also the
* expiration date and overall validity. */
if (tor_cert_checksig(cert, &cert->signing_key, time(NULL)) < 0) {
if (tor_cert_checksig(cert, &cert->signing_key, approx_time()) < 0) {
log_warn(LD_REND, "Invalid signature for %s.", log_obj_type);
goto err;
}
@ -1852,7 +1852,8 @@ desc_sig_is_valid(const char *b64_sig,
sig_start = tor_memstr(encoded_desc, encoded_len, "\n" str_signature);
/* Getting here means the token parsing worked for the signature so if we
* can't find the start of the signature, we have a code flow issue. */
if (BUG(!sig_start)) {
if (!sig_start) {
log_warn(LD_GENERAL, "Malformed signature line. Rejecting.");
goto err;
}
/* Skip newline, it has to go in the signature check. */

View File

@ -19,6 +19,14 @@
#include "test_helpers.h"
#include "log_test_helpers.h"
#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
DISABLE_GCC_WARNING(overlength-strings)
/* We allow huge string constants in the unit tests, but not in the code
* at large. */
#endif
#include "test_hs_descriptor.inc"
ENABLE_GCC_WARNING(overlength-strings)
/* Test certificate encoding put in a descriptor. */
static void
test_cert_encoding(void *arg)
@ -548,6 +556,27 @@ test_decode_invalid_intro_point(void *arg)
desc_intro_point_free(ip);
}
/** Make sure we fail gracefully when decoding the bad desc from #23233. */
static void
test_decode_bad_signature(void *arg)
{
hs_desc_plaintext_data_t desc_plaintext;
int ret;
(void) arg;
/* Update approx time to dodge cert expiration */
update_approx_time(1502661599);
setup_full_capture_of_logs(LOG_WARN);
ret = hs_desc_decode_plaintext(HS_DESC_BAD_SIG, &desc_plaintext);
tt_int_op(ret, OP_EQ, -1);
expect_log_msg_containing("Malformed signature line. Rejecting.");
teardown_capture_of_logs();
done: ;
}
static void
test_decode_plaintext(void *arg)
{
@ -838,6 +867,8 @@ struct testcase_t hs_descriptor[] = {
NULL, NULL },
{ "decode_plaintext", test_decode_plaintext, TT_FORK,
NULL, NULL },
{ "decode_bad_signature", test_decode_bad_signature, TT_FORK,
NULL, NULL },
/* Misc. */
{ "version", test_supported_version, TT_FORK,

View File

@ -0,0 +1,224 @@
static const char* HS_DESC_BAD_SIG =
"hs-descriptor 3\n"
"descriptor-lifetime 180\n"
"descriptor-signing-key-cert\n"
"-----BEGIN ED25519 CERT-----\n"
"AQgABl5+AQoPXRnCGEOxIup3AcjQXb8npNiUFm2Qv7A6JKk/K+EuAQAgBAD18iUD\n"
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"78vsuFEvLp7cvAgGxYY1xGXdn5RdHMCdi8W9yZLKMQX9OuJckmp1C6q+cA4=\n"
"-----END ED25519 CERT-----\n"
"revision-counter 42\n"
"superencrypted\n"
"-----BEGIN MESSAGE-----\n"
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"-----END MESSAGE-----\n"
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