diff --git a/changes/bug23233 b/changes/bug23233 new file mode 100644 index 000000000..689a99a2a --- /dev/null +++ b/changes/bug23233 @@ -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". diff --git a/src/or/hs_descriptor.c b/src/or/hs_descriptor.c index 2a000f500..616d2f280 100644 --- a/src/or/hs_descriptor.c +++ b/src/or/hs_descriptor.c @@ -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. */ diff --git a/src/test/test_hs_descriptor.c b/src/test/test_hs_descriptor.c index b1abe381d..8f8da361d 100644 --- a/src/test/test_hs_descriptor.c +++ b/src/test/test_hs_descriptor.c @@ -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, diff --git a/src/test/test_hs_descriptor.inc b/src/test/test_hs_descriptor.inc new file mode 100644 index 000000000..70a2c7c2f --- /dev/null +++ b/src/test/test_hs_descriptor.inc @@ -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" +"nbkUblnUvTHzipq4bcr6aPyFVB42Ptobg4xr8s3VjHiJtjs9MDEdr6nXS7UlyhEl\n" +"78vsuFEvLp7cvAgGxYY1xGXdn5RdHMCdi8W9yZLKMQX9OuJckmp1C6q+cA4=\n" +"-----END ED25519 CERT-----\n" +"revision-counter 42\n" 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+"eFym149F56B0yg5FR85Arg==\n" +"-----END MESSAGE-----\n" +" signature Of+jvQKzH9ot2NV5twlDO2CFbzLSB4absWTwG58TCHb+TWgQi3z6SZIoTnGGY/uicJgEkCN++bZZR49GiyHyCQ\n";