diff --git a/changes/bug3122_memcmp b/changes/bug3122_memcmp new file mode 100644 index 0000000000..a049476743 --- /dev/null +++ b/changes/bug3122_memcmp @@ -0,0 +1,7 @@ + o Security fixes + - Replace all potentially sensitive memory comparison operations + with versions whose runtime does not depend on the data being + compared. This will help resist a class of attacks where an + adversary can use variations in timing information to learn + sensitive data. Fix for one case of bug 3122. (Safe memcmp + implementation by Robert Ransom based partially on code by DJB.) diff --git a/configure.in b/configure.in index 26c933b156..e5db37060f 100644 --- a/configure.in +++ b/configure.in @@ -905,6 +905,24 @@ if test "$tor_cv_twos_complement" != no ; then [Define to 1 iff we represent negative integers with two's complement]) fi +# What does shifting a negative value do? +AC_CACHE_CHECK([whether right-shift on negative values does sign-extension], tor_cv_sign_extend, +[AC_RUN_IFELSE([AC_LANG_SOURCE( +[[int main () { int okay = (-60 >> 8) == -1; return okay ? 0 : 1; }]])], + [tor_cv_sign_extend=yes], + [tor_cv_sign_extend=no], + [tor_cv_sign_extend=cross])]) + +if test "$tor_cv_sign_extend" = cross ; then + # Cross-compiling; let's hope that the target isn't raving mad. + AC_MSG_NOTICE([Cross-compiling: we'll assume that right-shifting negative integers causes sign-extension]) +fi + +if test "$tor_cv_sign_extend" != no ; then + AC_DEFINE([RSHIFT_DOES_SIGN_EXTEND], 1, + [Define to 1 iff right-shifting a negative value performs sign-extension]) +fi + # Whether we should use the dmalloc memory allocation debugging library. AC_MSG_CHECKING(whether to use dmalloc (debug memory allocation library)) AC_ARG_WITH(dmalloc, diff --git a/src/common/Makefile.am b/src/common/Makefile.am index 20e3f5ae16..3a80eb80d4 100644 --- a/src/common/Makefile.am +++ b/src/common/Makefile.am @@ -15,6 +15,7 @@ libor_a_SOURCES = \ address.c \ compat.c \ container.c \ + di_ops.c \ log.c \ memarea.c \ mempool.c \ @@ -38,6 +39,7 @@ noinst_HEADERS = \ compat_libevent.h \ container.h \ crypto.h \ + di_ops.h \ ht.h \ memarea.h \ mempool.h \ diff --git a/src/common/address.c b/src/common/address.c index b612149157..65f429a4d2 100644 --- a/src/common/address.c +++ b/src/common/address.c @@ -837,7 +837,7 @@ tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2, const uint8_t *a2 = tor_addr_to_in6_addr8(addr2); const int bytes = mbits >> 3; const int leftover_bits = mbits & 7; - if (bytes && (r = memcmp(a1, a2, bytes))) { + if (bytes && (r = tor_memcmp(a1, a2, bytes))) { return r; } else if (leftover_bits) { uint8_t b1 = a1[bytes] >> (8-leftover_bits); diff --git a/src/common/compat.c b/src/common/compat.c index 7a77f94dcf..436d882f30 100644 --- a/src/common/compat.c +++ b/src/common/compat.c @@ -442,6 +442,8 @@ tor_vasprintf(char **strp, const char *fmt, va_list args) * needle, return a pointer to the first occurrence of the needle * within the haystack, or NULL if there is no such occurrence. * + * This function is not timing-safe. + * * Requires that nlen be greater than zero. */ const void * @@ -466,7 +468,7 @@ tor_memmem(const void *_haystack, size_t hlen, while ((p = memchr(p, first, end-p))) { if (p+nlen > end) return NULL; - if (!memcmp(p, needle, nlen)) + if (fast_memeq(p, needle, nlen)) return p; ++p; } diff --git a/src/common/container.c b/src/common/container.c index bc61226cb5..eba5a2f704 100644 --- a/src/common/container.c +++ b/src/common/container.c @@ -216,7 +216,7 @@ smartlist_string_num_isin(const smartlist_t *sl, int num) } /** Return true iff sl has some element E such that - * !memcmp(E,element,DIGEST_LEN) + * tor_memeq(E,element,DIGEST_LEN) */ int smartlist_digest_isin(const smartlist_t *sl, const char *element) @@ -224,7 +224,7 @@ smartlist_digest_isin(const smartlist_t *sl, const char *element) int i; if (!sl) return 0; for (i=0; i < sl->num_used; i++) - if (memcmp((const char*)sl->list[i],element,DIGEST_LEN)==0) + if (tor_memeq((const char*)sl->list[i],element,DIGEST_LEN)) return 1; return 0; } @@ -801,7 +801,7 @@ smartlist_pqueue_assert_ok(smartlist_t *sl, static int _compare_digests(const void **_a, const void **_b) { - return memcmp((const char*)*_a, (const char*)*_b, DIGEST_LEN); + return tor_memcmp((const char*)*_a, (const char*)*_b, DIGEST_LEN); } /** Sort the list of DIGEST_LEN-byte digests into ascending order. */ @@ -823,7 +823,7 @@ smartlist_uniq_digests(smartlist_t *sl) static int _compare_digests256(const void **_a, const void **_b) { - return memcmp((const char*)*_a, (const char*)*_b, DIGEST256_LEN); + return tor_memcmp((const char*)*_a, (const char*)*_b, DIGEST256_LEN); } /** Sort the list of DIGEST256_LEN-byte digests into ascending order. */ @@ -885,7 +885,7 @@ strmap_entry_hash(const strmap_entry_t *a) static INLINE int digestmap_entries_eq(const digestmap_entry_t *a, const digestmap_entry_t *b) { - return !memcmp(a->key, b->key, DIGEST_LEN); + return tor_memeq(a->key, b->key, DIGEST_LEN); } /** Helper: return a hash value for a digest_map_t. */ diff --git a/src/common/container.h b/src/common/container.h index 8a3a405273..b39d4ca07e 100644 --- a/src/common/container.h +++ b/src/common/container.h @@ -259,7 +259,7 @@ char *smartlist_join_strings2(smartlist_t *sl, const char *join, * Example use: * SMARTLIST_FOREACH_JOIN(routerstatus_list, routerstatus_t *, rs, * routerinfo_list, routerinfo_t *, ri, - * memcmp(rs->identity_digest, ri->identity_digest, 20), + * tor_memcmp(rs->identity_digest, ri->identity_digest, 20), * log_info(LD_GENERAL,"No match for %s", ri->nickname)) { * log_info(LD_GENERAL, "%s matches routerstatus %p", ri->nickname, rs); * } SMARTLIST_FOREACH_JOIN_END(rs, ri); @@ -274,7 +274,7 @@ char *smartlist_join_strings2(smartlist_t *sl, const char *join, * ri = smartlist_get(routerinfo_list, ri_sl_idx); * while (rs_sl_idx < rs_sl_len) { * rs = smartlist_get(routerstatus_list, rs_sl_idx); - * rs_ri_cmp = memcmp(rs->identity_digest, ri->identity_digest, 20); + * rs_ri_cmp = tor_memcmp(rs->identity_digest, ri->identity_digest, 20); * if (rs_ri_cmp > 0) { * break; * } else if (rs_ri_cmp == 0) { diff --git a/src/common/crypto.c b/src/common/crypto.c index 424fd09b6c..3de6fdded2 100644 --- a/src/common/crypto.c +++ b/src/common/crypto.c @@ -933,7 +933,7 @@ crypto_pk_public_checksig_digest(crypto_pk_env_t *env, const char *data, tor_free(buf); return -1; } - if (memcmp(buf, digest, DIGEST_LEN)) { + if (tor_memneq(buf, digest, DIGEST_LEN)) { log_warn(LD_CRYPTO, "Signature mismatched with digest."); tor_free(buf); return -1; diff --git a/src/common/di_ops.c b/src/common/di_ops.c new file mode 100644 index 0000000000..c1e292fe2f --- /dev/null +++ b/src/common/di_ops.c @@ -0,0 +1,133 @@ +/* Copyright (c) 2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file di_ops.c + * \brief Functions for data-independent operations + **/ + +#include "orconfig.h" +#include "di_ops.h" + +/** + * Timing-safe version of memcmp. As memcmp, compare the sz bytes + * at a with the sz bytes at , and returns less than 0 if the + * bytes at a lexically precede those at b, 0 if the byte ranges + * are equal, and greater than zero if the bytes at a lexically follow + * those at . + * + * This implementation differs from memcmp in that its timing behavior is not + * data-dependent: it should return in the same amount of time regardless of + * the contents of a and b. + */ +int +tor_memcmp(const void *a, const void *b, size_t len) +{ + const uint8_t *x = a; + const uint8_t *y = b; + size_t i = len; + int retval = 0; + + /* This loop goes from the end of the arrays to the start. At the + * start of every iteration, before we decrement i, we have set + * "retval" equal to the result of memcmp(a+i,b+i,len-i). During the + * loop, we update retval by leaving it unchanged if x[i]==y[i] and + * setting it to x[i]-y[i] if x[i]!= y[i]. + * + * The following assumes we are on a system with two's-complement + * arithmetic. We check for this at configure-time with the check + * that sets USING_TWOS_COMPLEMENT. If we aren't two's complement, then + * torint.h will stop compilation with an error. + */ + while (i--) { + int v1 = x[i]; + int v2 = y[i]; + int equal_p = v1 ^ v2; + + /* The following sets bits 8 and above of equal_p to 'equal_p == + * 0', and thus to v1 == v2. (To see this, note that if v1 == + * v2, then v1^v2 == equal_p == 0, so equal_p-1 == -1, which is the + * same as ~0 on a two's-complement machine. Then note that if + * v1 != v2, then 0 < v1 ^ v2 < 256, so 0 <= equal_p - 1 < 255.) + */ + --equal_p; + + equal_p >>= 8; + /* Thanks to (sign-preserving) arithmetic shift, equal_p is now + * equal to -(v1 == v2), which is exactly what we need below. + * (Since we're assuming two's-complement arithmetic, -1 is the + * same as ~0 (all bits set).) + * + * (The result of an arithmetic shift on a negative value is + * actually implementation-defined in standard C. So how do we + * get away with assuming it? Easy. We check.) */ +#if ((-60 >> 8) != -1) +#error "According to cpp, right-shift doesn't perform sign-extension." +#endif +#ifndef RSHIFT_DOES_SIGN_EXTEND +#error "According to configure, right-shift doesn't perform sign-extension." +#endif + + /* If v1 == v2, equal_p is ~0, so this will leave retval + * unchanged; otherwise, equal_p is 0, so this will zero it. */ + retval &= equal_p; + + /* If v1 == v2, then this adds 0, and leaves retval unchanged. + * Otherwise, we just zeroed retval, so this sets it to v1 - v2. */ + retval += (v1 - v2); + + /* There. Now retval is equal to its previous value if v1 == v2, and + * equal to v1 - v2 if v1 != v2. */ + } + + return retval; +} + +/** + * Timing-safe memory comparison. Return true if the sz bytes at + * a are the same as the sz bytes at , and 0 otherwise. + * + * This implementation differs from !memcmp(a,b,sz) in that its timing + * behavior is not data-dependent: it should return in the same amount of time + * regardless of the contents of a and b. It differs from + * !tor_memcmp(a,b,sz) by being faster. + */ +int +tor_memeq(const void *a, const void *b, size_t sz) +{ + /* Treat a and b as byte ranges. */ + const uint8_t *ba = a, *bb = b; + uint32_t any_difference = 0; + while (sz--) { + /* Set byte_diff to all of those bits that are different in *ba and *bb, + * and advance both ba and bb. */ + const uint8_t byte_diff = *ba++ ^ *bb++; + + /* Set bits in any_difference if they are set in byte_diff. */ + any_difference |= byte_diff; + } + + /* Now any_difference is 0 if there are no bits different between + * a and b, and is nonzero if there are bits different between a + * and b. Now for paranoia's sake, let's convert it to 0 or 1. + * + * (If we say "!any_difference", the compiler might get smart enough + * to optimize-out our data-independence stuff above.) + * + * To unpack: + * + * If any_difference == 0: + * any_difference - 1 == ~0 + * (any_difference - 1) >> 8 == 0x00ffffff + * 1 & ((any_difference - 1) >> 8) == 1 + * + * If any_difference != 0: + * 0 < any_difference < 256, so + * 0 < any_difference - 1 < 255 + * (any_difference - 1) >> 8 == 0 + * 1 & ((any_difference - 1) >> 8) == 0 + */ + + return 1 & ((any_difference - 1) >> 8); +} + diff --git a/src/common/di_ops.h b/src/common/di_ops.h new file mode 100644 index 0000000000..4a212b0ca2 --- /dev/null +++ b/src/common/di_ops.h @@ -0,0 +1,30 @@ +/* Copyright (c) 2003-2004, Roger Dingledine + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file di_ops.h + * \brief Headers for di_ops.c + **/ + +#ifndef TOR_DI_OPS_H +#define TOR_DI_OPS_H + +#include "orconfig.h" +#include "torint.h" + +int tor_memcmp(const void *a, const void *b, size_t sz); +int tor_memeq(const void *a, const void *b, size_t sz); +#define tor_memneq(a,b,sz) (!tor_memeq((a),(b),(sz))) + +/** Alias for the platform's memcmp() function. This function is + * not data-independent: we define this alias so that we can + * mark cases where we are deliberately using a data-dependent memcmp() + * implementation. + */ +#define fast_memcmp(a,b,c) (memcmp((a),(b),(c))) +#define fast_memeq(a,b,c) (0==memcmp((a),(b),(c))) +#define fast_memneq(a,b,c) (0!=memcmp((a),(b),(c))) + +#endif diff --git a/src/common/torgzip.c b/src/common/torgzip.c index e9079e0ba5..2937c67de2 100644 --- a/src/common/torgzip.c +++ b/src/common/torgzip.c @@ -378,7 +378,7 @@ tor_gzip_uncompress(char **out, size_t *out_len, compress_method_t detect_compression_method(const char *in, size_t in_len) { - if (in_len > 2 && !memcmp(in, "\x1f\x8b", 2)) { + if (in_len > 2 && fast_memeq(in, "\x1f\x8b", 2)) { return GZIP_METHOD; } else if (in_len > 2 && (in[0] & 0x0f) == 8 && (ntohs(get_uint16(in)) % 31) == 0) { diff --git a/src/common/util.c b/src/common/util.c index e676530b29..d2140c3f32 100644 --- a/src/common/util.c +++ b/src/common/util.c @@ -516,7 +516,7 @@ strcmp_len(const char *s1, const char *s2, size_t s1_len) return -1; if (s1_len > s2_len) return 1; - return memcmp(s1, s2, s2_len); + return fast_memcmp(s1, s2, s2_len); } /** Compares the first strlen(s2) characters of s1 with s2. Returns as for @@ -558,17 +558,17 @@ strcasecmpend(const char *s1, const char *s2) /** Compare the value of the string prefix with the start of the * memlen-byte memory chunk at mem. Return as for strcmp. * - * [As memcmp(mem, prefix, strlen(prefix)) but returns -1 if memlen is less - * than strlen(prefix).] + * [As fast_memcmp(mem, prefix, strlen(prefix)) but returns -1 if memlen is + * less than strlen(prefix).] */ int -memcmpstart(const void *mem, size_t memlen, +fast_memcmpstart(const void *mem, size_t memlen, const char *prefix) { size_t plen = strlen(prefix); if (memlen < plen) return -1; - return memcmp(mem, prefix, plen); + return fast_memcmp(mem, prefix, plen); } /** Return a pointer to the first char of s that is not whitespace and @@ -724,14 +724,16 @@ tor_mem_is_zero(const char *mem, size_t len) 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, }; while (len >= sizeof(ZERO)) { - if (memcmp(mem, ZERO, sizeof(ZERO))) + /* It's safe to use fast_memcmp here, since the very worst thing an + * attacker could learn is how many initial bytes of a secret were zero */ + if (fast_memcmp(mem, ZERO, sizeof(ZERO))) return 0; len -= sizeof(ZERO); mem += sizeof(ZERO); } /* Deal with leftover bytes. */ if (len) - return ! memcmp(mem, ZERO, len); + return fast_memeq(mem, ZERO, len); return 1; } @@ -740,7 +742,10 @@ tor_mem_is_zero(const char *mem, size_t len) int tor_digest_is_zero(const char *digest) { - return tor_mem_is_zero(digest, DIGEST_LEN); + static const uint8_t ZERO_DIGEST[] = { + 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 + }; + return tor_memeq(digest, ZERO_DIGEST, DIGEST_LEN); } /** Return true iff the DIGEST256_LEN bytes in digest are all zero. */ diff --git a/src/common/util.h b/src/common/util.h index 759f068b03..974b7d6fdc 100644 --- a/src/common/util.h +++ b/src/common/util.h @@ -14,6 +14,7 @@ #include "orconfig.h" #include "torint.h" #include "compat.h" +#include "di_ops.h" #include #include @@ -181,8 +182,8 @@ int strcasecmpstart(const char *s1, const char *s2) int strcmpend(const char *s1, const char *s2) ATTR_PURE ATTR_NONNULL((1,2)); int strcasecmpend(const char *s1, const char *s2) ATTR_PURE ATTR_NONNULL((1,2)); -int memcmpstart(const void *mem, size_t memlen, - const char *prefix) ATTR_PURE; +int fast_memcmpstart(const void *mem, size_t memlen, + const char *prefix) ATTR_PURE; void tor_strstrip(char *s, const char *strip) ATTR_NONNULL((1,2)); long tor_parse_long(const char *s, int base, long min, diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index d02ea1678e..17e7c14990 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -1818,7 +1818,7 @@ circuit_n_conn_done(or_connection_t *or_conn, int status) continue; } else { /* We expected a key. See if it's the right one. */ - if (memcmp(or_conn->identity_digest, + if (tor_memneq(or_conn->identity_digest, circ->n_hop->identity_digest, DIGEST_LEN)) continue; } @@ -2226,7 +2226,7 @@ circuit_extend(cell_t *cell, circuit_t *circ) /* Next, check if we're being asked to connect to the hop that the * extend cell came from. There isn't any reason for that, and it can * assist circular-path attacks. */ - if (!memcmp(id_digest, TO_OR_CIRCUIT(circ)->p_conn->identity_digest, + if (tor_memeq(id_digest, TO_OR_CIRCUIT(circ)->p_conn->identity_digest, DIGEST_LEN)) { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Client asked me to extend back to the previous hop."); @@ -3527,7 +3527,7 @@ static INLINE entry_guard_t * is_an_entry_guard(const char *digest) { SMARTLIST_FOREACH(entry_guards, entry_guard_t *, entry, - if (!memcmp(digest, entry->identity, DIGEST_LEN)) + if (tor_memeq(digest, entry->identity, DIGEST_LEN)) return entry; ); return NULL; @@ -3860,7 +3860,7 @@ entry_guard_register_connect_status(const char *digest, int succeeded, SMARTLIST_FOREACH(entry_guards, entry_guard_t *, e, { - if (!memcmp(e->identity, digest, DIGEST_LEN)) { + if (tor_memeq(e->identity, digest, DIGEST_LEN)) { entry = e; idx = e_sl_idx; break; @@ -4524,7 +4524,7 @@ get_configured_bridge_by_addr_port_digest(tor_addr_t *addr, uint16_t port, !tor_addr_compare(&bridge->addr, addr, CMP_EXACT) && bridge->port == port) return bridge; - if (!memcmp(bridge->identity, digest, DIGEST_LEN)) + if (tor_memeq(bridge->identity, digest, DIGEST_LEN)) return bridge; } SMARTLIST_FOREACH_END(bridge); @@ -4605,7 +4605,7 @@ find_bridge_by_digest(const char *digest) { SMARTLIST_FOREACH(bridge_list, bridge_info_t *, bridge, { - if (!memcmp(bridge->identity, digest, DIGEST_LEN)) + if (tor_memeq(bridge->identity, digest, DIGEST_LEN)) return bridge; }); return NULL; diff --git a/src/or/circuitlist.c b/src/or/circuitlist.c index 0aadcbfa0b..7c5fd25700 100644 --- a/src/or/circuitlist.c +++ b/src/or/circuitlist.c @@ -254,7 +254,7 @@ circuit_get_all_pending_on_or_conn(smartlist_t *out, or_connection_t *or_conn) continue; } else { /* We expected a key. See if it's the right one. */ - if (memcmp(or_conn->identity_digest, + if (tor_memneq(or_conn->identity_digest, circ->n_hop->identity_digest, DIGEST_LEN)) continue; } @@ -717,7 +717,7 @@ circuit_dump_by_conn(connection_t *conn, int severity) tor_addr_eq(&circ->n_hop->addr, &conn->addr) && circ->n_hop->port == conn->port && conn->type == CONN_TYPE_OR && - !memcmp(TO_OR_CONN(conn)->identity_digest, + tor_memeq(TO_OR_CONN(conn)->identity_digest, circ->n_hop->identity_digest, DIGEST_LEN)) { circuit_dump_details(severity, circ, conn->conn_array_index, (circ->state == CIRCUIT_STATE_OPEN && @@ -911,7 +911,7 @@ circuit_get_next_by_pk_and_purpose(origin_circuit_t *start, if (!digest) return TO_ORIGIN_CIRCUIT(circ); else if (TO_ORIGIN_CIRCUIT(circ)->rend_data && - !memcmp(TO_ORIGIN_CIRCUIT(circ)->rend_data->rend_pk_digest, + tor_memeq(TO_ORIGIN_CIRCUIT(circ)->rend_data->rend_pk_digest, digest, DIGEST_LEN)) return TO_ORIGIN_CIRCUIT(circ); } @@ -929,7 +929,7 @@ circuit_get_by_rend_token_and_purpose(uint8_t purpose, const char *token, for (circ = global_circuitlist; circ; circ = circ->next) { if (! circ->marked_for_close && circ->purpose == purpose && - ! memcmp(TO_OR_CIRCUIT(circ)->rend_token, token, len)) + tor_memeq(TO_OR_CIRCUIT(circ)->rend_token, token, len)) return TO_OR_CIRCUIT(circ); } return NULL; @@ -1006,7 +1006,7 @@ circuit_find_to_cannibalize(uint8_t purpose, extend_info_t *info, const node_t *ri1 = node_get_by_id(info->identity_digest); do { const node_t *ri2; - if (!memcmp(hop->extend_info->identity_digest, + if (tor_memeq(hop->extend_info->identity_digest, info->identity_digest, DIGEST_LEN)) goto next; if (ri1 && diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 135aa803ac..fe75df9775 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -109,7 +109,7 @@ circuit_is_acceptable(circuit_t *circ, edge_connection_t *conn, char digest[DIGEST_LEN]; if (hexdigest_to_digest(conn->chosen_exit_name, digest) < 0) return 0; /* broken digest, we don't want it */ - if (memcmp(digest, build_state->chosen_exit->identity_digest, + if (tor_memneq(digest, build_state->chosen_exit->identity_digest, DIGEST_LEN)) return 0; /* this is a circuit to somewhere else */ if (tor_digest_is_zero(digest)) { diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c index 4e45cbeff6..186137b1df 100644 --- a/src/or/connection_edge.c +++ b/src/or/connection_edge.c @@ -577,7 +577,7 @@ connection_ap_fail_onehop(const char *failed_digest, if (!edge_conn->want_onehop) continue; if (hexdigest_to_digest(edge_conn->chosen_exit_name, digest) < 0 || - memcmp(digest, failed_digest, DIGEST_LEN)) + tor_memneq(digest, failed_digest, DIGEST_LEN)) continue; if (tor_digest_is_zero(digest)) { /* we don't know the digest; have to compare addr:port */ @@ -3072,7 +3072,7 @@ connection_ap_can_use_exit(edge_connection_t *conn, const node_t *exit) if (conn->chosen_exit_name) { const node_t *chosen_exit = node_get_by_nickname(conn->chosen_exit_name, 1); - if (!chosen_exit || memcmp(chosen_exit->identity, + if (!chosen_exit || tor_memneq(chosen_exit->identity, exit->identity, DIGEST_LEN)) { /* doesn't match */ // log_debug(LD_APP,"Requested node '%s', considering node '%s'. No.", diff --git a/src/or/connection_or.c b/src/or/connection_or.c index 1f2575ae14..73aad7e485 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -124,7 +124,7 @@ connection_or_set_identity_digest(or_connection_t *conn, const char *digest) if (!orconn_identity_map) orconn_identity_map = digestmap_new(); - if (!memcmp(conn->identity_digest, digest, DIGEST_LEN)) + if (tor_memeq(conn->identity_digest, digest, DIGEST_LEN)) return; /* If the identity was set previously, remove the old mapping. */ @@ -143,7 +143,7 @@ connection_or_set_identity_digest(or_connection_t *conn, const char *digest) #if 1 /* Testing code to check for bugs in representation. */ for (; tmp; tmp = tmp->next_with_same_id) { - tor_assert(!memcmp(tmp->identity_digest, digest, DIGEST_LEN)); + tor_assert(tor_memeq(tmp->identity_digest, digest, DIGEST_LEN)); tor_assert(tmp != conn); } #endif @@ -585,7 +585,7 @@ connection_or_get_for_extend(const char *digest, for (; conn; conn = conn->next_with_same_id) { tor_assert(conn->_base.magic == OR_CONNECTION_MAGIC); tor_assert(conn->_base.type == CONN_TYPE_OR); - tor_assert(!memcmp(conn->identity_digest, digest, DIGEST_LEN)); + tor_assert(tor_memeq(conn->identity_digest, digest, DIGEST_LEN)); if (conn->_base.marked_for_close) continue; /* Never return a non-open connection. */ @@ -788,7 +788,7 @@ connection_or_set_bad_connections(const char *digest, int force) return; DIGESTMAP_FOREACH(orconn_identity_map, identity, or_connection_t *, conn) { - if (!digest || !memcmp(digest, conn->identity_digest, DIGEST_LEN)) + if (!digest || tor_memeq(digest, conn->identity_digest, DIGEST_LEN)) connection_or_group_set_badness(conn, force); } DIGESTMAP_FOREACH_END; } @@ -1221,7 +1221,7 @@ connection_or_check_valid_tls_handshake(or_connection_t *conn, int as_advertised = 1; tor_assert(has_cert); tor_assert(has_identity); - if (memcmp(digest_rcvd_out, conn->identity_digest, DIGEST_LEN)) { + if (tor_memneq(digest_rcvd_out, conn->identity_digest, DIGEST_LEN)) { /* I was aiming for a particular digest. I didn't get it! */ char seen[HEX_DIGEST_LEN+1]; char expected[HEX_DIGEST_LEN+1]; diff --git a/src/or/control.c b/src/or/control.c index 0aada57307..75f025f937 100644 --- a/src/or/control.c +++ b/src/or/control.c @@ -341,7 +341,7 @@ write_escaped_data(const char *data, size_t len, char **out) } *outp++ = *data++; } - if (outp < *out+2 || memcmp(outp-2, "\r\n", 2)) { + if (outp < *out+2 || fast_memcmp(outp-2, "\r\n", 2)) { *outp++ = '\r'; *outp++ = '\n'; } @@ -507,7 +507,7 @@ connection_printf_to_buf(control_connection_t *conn, const char *format, ...) return; } len = strlen(buf); - if (memcmp("\r\n\0", buf+len-2, 3)) { + if (fast_memcmp("\r\n\0", buf+len-2, 3)) { buf[CONNECTION_PRINTF_TO_BUF_BUFFERSIZE-1] = '\0'; buf[CONNECTION_PRINTF_TO_BUF_BUFFERSIZE-2] = '\n'; buf[CONNECTION_PRINTF_TO_BUF_BUFFERSIZE-3] = '\r'; @@ -588,7 +588,7 @@ send_control_event_impl(uint16_t event, event_format_t which, } len = strlen(buf); - if (memcmp("\r\n\0", buf+len-2, 3)) { + if (fast_memcmp("\r\n\0", buf+len-2, 3)) { /* if it is not properly terminated, do it now */ buf[SEND_CONTROL1_EVENT_BUFFERSIZE-1] = '\0'; buf[SEND_CONTROL1_EVENT_BUFFERSIZE-2] = '\n'; @@ -1078,7 +1078,7 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len, goto err; } bad_cookie = 1; - } else if (memcmp(authentication_cookie, password, password_len)) { + } else if (tor_memneq(authentication_cookie, password, password_len)) { if (!also_password) { log_warn(LD_CONTROL, "Got mismatched authentication cookie"); errstr = "Authentication cookie did not match expected value."; @@ -1128,7 +1128,7 @@ handle_control_authenticate(control_connection_t *conn, uint32_t len, SMARTLIST_FOREACH(sl, char *, expected, { secret_to_key(received,DIGEST_LEN,password,password_len,expected); - if (!memcmp(expected+S2K_SPECIFIER_LEN, received, DIGEST_LEN)) + if (tor_memeq(expected+S2K_SPECIFIER_LEN, received, DIGEST_LEN)) goto ok; }); SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); @@ -2921,13 +2921,13 @@ connection_control_process_inbuf(control_connection_t *conn) break; /* XXXX this code duplication is kind of dumb. */ if (last_idx+3 == conn->incoming_cmd_cur_len && - !memcmp(conn->incoming_cmd + last_idx, ".\r\n", 3)) { + tor_memeq(conn->incoming_cmd + last_idx, ".\r\n", 3)) { /* Just appended ".\r\n"; we're done. Remove it. */ conn->incoming_cmd[last_idx] = '\0'; conn->incoming_cmd_cur_len -= 3; break; } else if (last_idx+2 == conn->incoming_cmd_cur_len && - !memcmp(conn->incoming_cmd + last_idx, ".\n", 2)) { + tor_memeq(conn->incoming_cmd + last_idx, ".\n", 2)) { /* Just appended ".\n"; we're done. Remove it. */ conn->incoming_cmd[last_idx] = '\0'; conn->incoming_cmd_cur_len -= 2; diff --git a/src/or/directory.c b/src/or/directory.c index 313c6c5a40..56c4457700 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -2541,7 +2541,7 @@ client_likes_consensus(networkstatus_t *v, const char *want_url) SMARTLIST_FOREACH_BEGIN(v->voters, networkstatus_voter_info_t *, vi) { if (smartlist_len(vi->sigs) && - !memcmp(vi->identity_digest, want_digest, want_len)) { + tor_memeq(vi->identity_digest, want_digest, want_len)) { have++; break; }; @@ -3744,17 +3744,17 @@ dir_microdesc_download_failed(smartlist_t *failed, } SMARTLIST_FOREACH_END(d); } -/** Helper. Compare two fp_pair_t objects, and return -1, 0, or 1 as - * appropriate. */ +/** Helper. Compare two fp_pair_t objects, and return negative, 0, or + * positive as appropriate. */ static int _compare_pairs(const void **a, const void **b) { const fp_pair_t *fp1 = *a, *fp2 = *b; int r; - if ((r = memcmp(fp1->first, fp2->first, DIGEST_LEN))) + if ((r = fast_memcmp(fp1->first, fp2->first, DIGEST_LEN))) return r; else - return memcmp(fp1->second, fp2->second, DIGEST_LEN); + return fast_memcmp(fp1->second, fp2->second, DIGEST_LEN); } /** Divide a string res of the form FP1-FP2+FP3-FP4...[.z], where each diff --git a/src/or/dirserv.c b/src/or/dirserv.c index 0ac2d804c7..d22ef3bac3 100644 --- a/src/or/dirserv.c +++ b/src/or/dirserv.c @@ -2116,7 +2116,7 @@ routerstatus_format_entry(char *buf, size_t buf_len, /* This assert can fire for the control port, because * it can request NS documents before all descriptors * have been fetched. */ - if (memcmp(desc->cache_info.signed_descriptor_digest, + if (tor_memneq(desc->cache_info.signed_descriptor_digest, rs->descriptor_digest, DIGEST_LEN)) { char rl_d[HEX_DIGEST_LEN+1]; @@ -2132,7 +2132,7 @@ routerstatus_format_entry(char *buf, size_t buf_len, "(router %s)\n", rl_d, rs_d, id); - tor_assert(!memcmp(desc->cache_info.signed_descriptor_digest, + tor_assert(tor_memeq(desc->cache_info.signed_descriptor_digest, rs->descriptor_digest, DIGEST_LEN)); }; @@ -2234,9 +2234,9 @@ _compare_routerinfo_by_ip_and_bw(const void **a, const void **b) /* They're equal! Compare by identity digest, so there's a * deterministic order and we avoid flapping. */ - return memcmp(first->cache_info.identity_digest, - second->cache_info.identity_digest, - DIGEST_LEN); + return fast_memcmp(first->cache_info.identity_digest, + second->cache_info.identity_digest, + DIGEST_LEN); } /** Given a list of routerinfo_t in routers, return a new digestmap_t @@ -3185,7 +3185,7 @@ dirserv_orconn_tls_done(const char *address, SMARTLIST_FOREACH_BEGIN(rl->routers, routerinfo_t *, ri) { if (!strcasecmp(address, ri->address) && or_port == ri->or_port && as_advertised && - !memcmp(ri->cache_info.identity_digest, digest_rcvd, DIGEST_LEN)) { + fast_memeq(ri->cache_info.identity_digest, digest_rcvd, DIGEST_LEN)) { /* correct digest. mark this router reachable! */ if (!bridge_auth || ri->purpose == ROUTER_PURPOSE_BRIDGE) { tor_addr_t addr, *addrp=NULL; diff --git a/src/or/dirvote.c b/src/or/dirvote.c index fa0398c287..6fe29f2f4f 100644 --- a/src/or/dirvote.c +++ b/src/or/dirvote.c @@ -337,7 +337,7 @@ static int _compare_votes_by_authority_id(const void **_a, const void **_b) { const networkstatus_t *a = *_a, *b = *_b; - return memcmp(get_voter(a)->identity_digest, + return fast_memcmp(get_voter(a)->identity_digest, get_voter(b)->identity_digest, DIGEST_LEN); } @@ -354,7 +354,7 @@ _compare_dir_src_ents_by_authority_id(const void **_a, const void **_b) a_id = a->is_legacy ? a_v->legacy_id_digest : a_v->identity_digest; b_id = b->is_legacy ? b_v->legacy_id_digest : b_v->identity_digest; - return memcmp(a_id, b_id, DIGEST_LEN); + return fast_memcmp(a_id, b_id, DIGEST_LEN); } /** Given a sorted list of strings in, add every member to out @@ -391,10 +391,10 @@ static int compare_vote_rs(const vote_routerstatus_t *a, const vote_routerstatus_t *b) { int r; - if ((r = memcmp(a->status.identity_digest, b->status.identity_digest, + if ((r = fast_memcmp(a->status.identity_digest, b->status.identity_digest, DIGEST_LEN))) return r; - if ((r = memcmp(a->status.descriptor_digest, b->status.descriptor_digest, + if ((r = fast_memcmp(a->status.descriptor_digest, b->status.descriptor_digest, DIGEST_LEN))) return r; if ((r = (int)(b->status.published_on - a->status.published_on))) @@ -1641,7 +1641,7 @@ networkstatus_compute_consensus(smartlist_t *votes, strmap_set_lc(name_to_id_map, rs->status.nickname, rs->status.identity_digest); } else if (d != conflict && - memcmp(d, rs->status.identity_digest, DIGEST_LEN)) { + fast_memcmp(d, rs->status.identity_digest, DIGEST_LEN)) { /* Authorities disagree about this nickname. */ strmap_set_lc(name_to_id_map, rs->status.nickname, conflict); } else { @@ -1665,7 +1665,7 @@ networkstatus_compute_consensus(smartlist_t *votes, } else if (!d) { /* We have no name officially mapped to this digest. */ strmap_set_lc(name_to_id_map, rs->status.nickname, unknown); - } else if (!memcmp(d, rs->status.identity_digest, DIGEST_LEN)) { + } else if (fast_memeq(d, rs->status.identity_digest, DIGEST_LEN)) { /* Authorities disagree about this nickname. */ strmap_set_lc(name_to_id_map, rs->status.nickname, conflict); } else { @@ -1698,7 +1698,7 @@ networkstatus_compute_consensus(smartlist_t *votes, if (index[v_sl_idx] < size[v_sl_idx]) { rs = smartlist_get(v->routerstatus_list, index[v_sl_idx]); if (!lowest_id || - memcmp(rs->status.identity_digest, lowest_id, DIGEST_LEN) < 0) + fast_memcmp(rs->status.identity_digest, lowest_id, DIGEST_LEN) < 0) lowest_id = rs->status.identity_digest; } }); @@ -1717,7 +1717,7 @@ networkstatus_compute_consensus(smartlist_t *votes, if (index[v_sl_idx] >= size[v_sl_idx]) continue; /* out of entries. */ rs = smartlist_get(v->routerstatus_list, index[v_sl_idx]); - if (memcmp(rs->status.identity_digest, lowest_id, DIGEST_LEN)) + if (fast_memcmp(rs->status.identity_digest, lowest_id, DIGEST_LEN)) continue; /* doesn't include this router. */ /* At this point, we know that we're looking at a routerstatus with * identity "lowest". @@ -1762,7 +1762,7 @@ networkstatus_compute_consensus(smartlist_t *votes, rs = compute_routerstatus_consensus(matching_descs, consensus_method, microdesc_digest); /* Copy bits of that into rs_out. */ - tor_assert(!memcmp(lowest_id, rs->status.identity_digest, DIGEST_LEN)); + tor_assert(fast_memeq(lowest_id, rs->status.identity_digest, DIGEST_LEN)); memcpy(rs_out.identity_digest, lowest_id, DIGEST_LEN); memcpy(rs_out.descriptor_digest, rs->status.descriptor_digest, DIGEST_LEN); @@ -1786,7 +1786,7 @@ networkstatus_compute_consensus(smartlist_t *votes, const char *d = strmap_get_lc(name_to_id_map, rs_out.nickname); if (!d) { is_named = is_unnamed = 0; - } else if (!memcmp(d, lowest_id, DIGEST_LEN)) { + } else if (fast_memeq(d, lowest_id, DIGEST_LEN)) { is_named = 1; is_unnamed = 0; } else { is_named = 0; is_unnamed = 1; @@ -1884,11 +1884,11 @@ networkstatus_compute_consensus(smartlist_t *votes, SMARTLIST_FOREACH(matching_descs, vote_routerstatus_t *, vsr, { /* Check if the vote where this status comes from had the * proper descriptor */ - tor_assert(!memcmp(rs_out.identity_digest, + tor_assert(fast_memeq(rs_out.identity_digest, vsr->status.identity_digest, DIGEST_LEN)); if (vsr->status.has_exitsummary && - !memcmp(rs_out.descriptor_digest, + fast_memeq(rs_out.descriptor_digest, vsr->status.descriptor_digest, DIGEST_LEN)) { tor_assert(vsr->status.exitsummary); @@ -2204,7 +2204,7 @@ networkstatus_add_detached_signatures(networkstatus_t *target, } for (alg = DIGEST_SHA1; alg < N_DIGEST_ALGORITHMS; ++alg) { if (!tor_mem_is_zero(digests->d[alg], DIGEST256_LEN)) { - if (!memcmp(target->digests.d[alg], digests->d[alg], DIGEST256_LEN)) { + if (fast_memeq(target->digests.d[alg], digests->d[alg], DIGEST256_LEN)) { ++n_matches; } else { *msg_out = "Mismatched digest."; @@ -2968,11 +2968,11 @@ dirvote_add_vote(const char *vote_body, const char **msg_out, int *status_out) /* Now see whether we already have a vote from this authority. */ SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, v, { - if (! memcmp(v->vote->cert->cache_info.identity_digest, + if (fast_memeq(v->vote->cert->cache_info.identity_digest, vote->cert->cache_info.identity_digest, DIGEST_LEN)) { networkstatus_voter_info_t *vi_old = get_voter(v->vote); - if (!memcmp(vi_old->vote_digest, vi->vote_digest, DIGEST_LEN)) { + if (fast_memeq(vi_old->vote_digest, vi->vote_digest, DIGEST_LEN)) { /* Ah, it's the same vote. Not a problem. */ log_info(LD_DIR, "Discarding a vote we already have (from %s).", vi->address); @@ -3473,23 +3473,23 @@ dirvote_get_vote(const char *fp, int flags) if (by_id) { if (pending_vote_list && include_pending) { SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, pv, - if (!memcmp(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN)) + if (fast_memeq(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN)) return pv->vote_body); } if (previous_vote_list && include_previous) { SMARTLIST_FOREACH(previous_vote_list, pending_vote_t *, pv, - if (!memcmp(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN)) + if (fast_memeq(get_voter(pv->vote)->identity_digest, fp, DIGEST_LEN)) return pv->vote_body); } } else { if (pending_vote_list && include_pending) { SMARTLIST_FOREACH(pending_vote_list, pending_vote_t *, pv, - if (!memcmp(pv->vote->digests.d[DIGEST_SHA1], fp, DIGEST_LEN)) + if (fast_memeq(pv->vote->digests.d[DIGEST_SHA1], fp, DIGEST_LEN)) return pv->vote_body); } if (previous_vote_list && include_previous) { SMARTLIST_FOREACH(previous_vote_list, pending_vote_t *, pv, - if (!memcmp(pv->vote->digests.d[DIGEST_SHA1], fp, DIGEST_LEN)) + if (fast_memeq(pv->vote->digests.d[DIGEST_SHA1], fp, DIGEST_LEN)) return pv->vote_body); } } @@ -3608,7 +3608,7 @@ vote_routerstatus_find_microdesc_hash(char *digest256_out, * the first part. */ while (1) { num_len = strspn(cp, "1234567890"); - if (num_len == mlen && !memcmp(mstr, cp, mlen)) { + if (num_len == mlen && fast_memeq(mstr, cp, mlen)) { /* This is the line. */ char buf[BASE64_DIGEST256_LEN+1]; /* XXXX ignores extraneous stuff if the digest is too long. This diff --git a/src/or/eventdns.c b/src/or/eventdns.c index e9770c8c72..fb05e48d33 100644 --- a/src/or/eventdns.c +++ b/src/or/eventdns.c @@ -461,7 +461,7 @@ sockaddr_eq(const struct sockaddr *sa1, const struct sockaddr *sa2, const struct sockaddr_in6 *sin1, *sin2; sin1 = (const struct sockaddr_in6 *)sa1; sin2 = (const struct sockaddr_in6 *)sa2; - if (memcmp(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16)) + if (tor_memneq(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16)) return 0; else if (include_port && sin1->sin6_port != sin2->sin6_port) return 0; @@ -2253,7 +2253,7 @@ sockaddr_is_loopback(const struct sockaddr *addr) return (ntohl(sin->sin_addr.s_addr) & 0xff000000) == 0x7f000000; } else if (addr->sa_family == AF_INET6) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr; - return !memcmp(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16); + return fast_memeq(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16); } return 0; } diff --git a/src/or/microdesc.c b/src/or/microdesc.c index 717488bded..f7f42a4dec 100644 --- a/src/or/microdesc.c +++ b/src/or/microdesc.c @@ -55,7 +55,7 @@ _microdesc_hash(microdesc_t *md) static INLINE int _microdesc_eq(microdesc_t *a, microdesc_t *b) { - return !memcmp(a->digest, b->digest, DIGEST256_LEN); + return tor_memeq(a->digest, b->digest, DIGEST256_LEN); } HT_PROTOTYPE(microdesc_map, microdesc_t, node, @@ -477,7 +477,7 @@ microdesc_cache_rebuild(microdesc_cache_t *cache, int force) " with \"onion-key\". Instead I got %s.", (int)md->off, escaped(bad_str)); tor_free(bad_str); - tor_assert(!memcmp(md->body, "onion-key", 9)); + tor_assert(fast_memeq(md->body, "onion-key", 9)); } } SMARTLIST_FOREACH_END(md); diff --git a/src/or/networkstatus.c b/src/or/networkstatus.c index 7fd3d365f4..837c8c2bf2 100644 --- a/src/or/networkstatus.c +++ b/src/or/networkstatus.c @@ -424,7 +424,7 @@ networkstatus_get_voter_by_id(networkstatus_t *vote, if (!vote || !vote->voters) return NULL; SMARTLIST_FOREACH(vote->voters, networkstatus_voter_info_t *, voter, - if (!memcmp(voter->identity_digest, identity, DIGEST_LEN)) + if (fast_memeq(voter->identity_digest, identity, DIGEST_LEN)) return voter); return NULL; } @@ -445,9 +445,9 @@ networkstatus_check_document_signature(const networkstatus_t *consensus, if (crypto_pk_get_digest(cert->signing_key, key_digest)<0) return -1; - if (memcmp(sig->signing_key_digest, key_digest, DIGEST_LEN) || - memcmp(sig->identity_digest, cert->cache_info.identity_digest, - DIGEST_LEN)) + if (tor_memneq(sig->signing_key_digest, key_digest, DIGEST_LEN) || + tor_memneq(sig->identity_digest, cert->cache_info.identity_digest, + DIGEST_LEN)) return -1; signed_digest_len = crypto_pk_keysize(cert->signing_key); @@ -457,7 +457,7 @@ networkstatus_check_document_signature(const networkstatus_t *consensus, signed_digest_len, sig->signature, sig->signature_len) < dlen || - memcmp(signed_digest, consensus->digests.d[sig->alg], dlen)) { + tor_memneq(signed_digest, consensus->digests.d[sig->alg], dlen)) { log_warn(LD_DIR, "Got a bad signature on a networkstatus vote"); sig->bad_signature = 1; } else { @@ -509,7 +509,7 @@ networkstatus_check_consensus_signature(networkstatus_t *consensus, authority_cert_t *cert = authority_cert_get_by_digests(sig->identity_digest, sig->signing_key_digest); - tor_assert(!memcmp(sig->identity_digest, voter->identity_digest, + tor_assert(tor_memeq(sig->identity_digest, voter->identity_digest, DIGEST_LEN)); if (!is_v3_auth) { @@ -812,8 +812,8 @@ router_set_networkstatus_v2(const char *s, time_t arrived_at, for (i=0; i < smartlist_len(networkstatus_v2_list); ++i) { networkstatus_v2_t *old_ns = smartlist_get(networkstatus_v2_list, i); - if (!memcmp(old_ns->identity_digest, ns->identity_digest, DIGEST_LEN)) { - if (!memcmp(old_ns->networkstatus_digest, + if (tor_memeq(old_ns->identity_digest, ns->identity_digest, DIGEST_LEN)) { + if (tor_memeq(old_ns->networkstatus_digest, ns->networkstatus_digest, DIGEST_LEN)) { /* Same one we had before. */ networkstatus_v2_free(ns); @@ -939,7 +939,7 @@ compare_digest_to_routerstatus_entry(const void *_key, const void **_member) { const char *key = _key; const routerstatus_t *rs = *_member; - return memcmp(key, rs->identity_digest, DIGEST_LEN); + return tor_memcmp(key, rs->identity_digest, DIGEST_LEN); } /** As networkstatus_v2_find_entry, but do not return a const pointer */ @@ -1404,7 +1404,7 @@ networkstatus_v2_get_by_digest(const char *digest) { SMARTLIST_FOREACH(networkstatus_v2_list, networkstatus_v2_t *, ns, { - if (!memcmp(ns->identity_digest, digest, DIGEST_LEN)) + if (tor_memeq(ns->identity_digest, digest, DIGEST_LEN)) return ns; }); return NULL; @@ -1467,10 +1467,10 @@ networkstatus_get_reasonably_live_consensus(time_t now, int flavor) static int routerstatus_has_changed(const routerstatus_t *a, const routerstatus_t *b) { - tor_assert(!memcmp(a->identity_digest, b->identity_digest, DIGEST_LEN)); + tor_assert(tor_memeq(a->identity_digest, b->identity_digest, DIGEST_LEN)); return strcmp(a->nickname, b->nickname) || - memcmp(a->descriptor_digest, b->descriptor_digest, DIGEST_LEN) || + fast_memneq(a->descriptor_digest, b->descriptor_digest, DIGEST_LEN) || a->addr != b->addr || a->or_port != b->or_port || a->dir_port != b->dir_port || @@ -1522,7 +1522,7 @@ notify_control_networkstatus_changed(const networkstatus_t *old_c, SMARTLIST_FOREACH_JOIN( old_c->routerstatus_list, const routerstatus_t *, rs_old, new_c->routerstatus_list, const routerstatus_t *, rs_new, - memcmp(rs_old->identity_digest, + tor_memcmp(rs_old->identity_digest, rs_new->identity_digest, DIGEST_LEN), smartlist_add(changed, (void*) rs_new)) { if (routerstatus_has_changed(rs_old, rs_new)) @@ -1546,13 +1546,13 @@ networkstatus_copy_old_consensus_info(networkstatus_t *new_c, SMARTLIST_FOREACH_JOIN(old_c->routerstatus_list, routerstatus_t *, rs_old, new_c->routerstatus_list, routerstatus_t *, rs_new, - memcmp(rs_old->identity_digest, + tor_memcmp(rs_old->identity_digest, rs_new->identity_digest, DIGEST_LEN), STMT_NIL) { /* Okay, so we're looking at the same identity. */ rs_new->last_dir_503_at = rs_old->last_dir_503_at; - if (!memcmp(rs_old->descriptor_digest, rs_new->descriptor_digest, + if (tor_memeq(rs_old->descriptor_digest, rs_new->descriptor_digest, DIGEST_LEN)) { /* And the same descriptor too! */ memcpy(&rs_new->dl_status, &rs_old->dl_status,sizeof(download_status_t)); @@ -1668,7 +1668,7 @@ networkstatus_set_current_consensus(const char *consensus, } if (current_digests && - !memcmp(&c->digests, current_digests, sizeof(c->digests))) { + tor_memeq(&c->digests, current_digests, sizeof(c->digests))) { /* We already have this one. That's a failure. */ log_info(LD_DIR, "Got a %s consensus we already have", flavor); goto done; @@ -2003,7 +2003,7 @@ routers_update_status_from_consensus_networkstatus(smartlist_t *routers, SMARTLIST_FOREACH_JOIN(ns->routerstatus_list, routerstatus_t *, rs, routers, routerinfo_t *, router, - memcmp(rs->identity_digest, + tor_memcmp(rs->identity_digest, router->cache_info.identity_digest, DIGEST_LEN), { #if 0 @@ -2020,7 +2020,7 @@ routers_update_status_from_consensus_networkstatus(smartlist_t *routers, ds = router_get_trusteddirserver_by_digest(digest); /* Is it the same descriptor, or only the same identity? */ - if (!memcmp(router->cache_info.signed_descriptor_digest, + if (tor_memeq(router->cache_info.signed_descriptor_digest, rs->descriptor_digest, DIGEST_LEN)) { if (ns->valid_until > router->cache_info.last_listed_as_valid_until) router->cache_info.last_listed_as_valid_until = ns->valid_until; @@ -2049,10 +2049,10 @@ routers_update_status_from_consensus_networkstatus(smartlist_t *routers, time_t live_until = ns->published_on + V2_NETWORKSTATUS_ROUTER_LIFETIME; SMARTLIST_FOREACH_JOIN(ns->entries, const routerstatus_t *, rs, routers, routerinfo_t *, ri, - memcmp(rs->identity_digest, + tor_memcmp(rs->identity_digest, ri->cache_info.identity_digest, DIGEST_LEN), STMT_NIL) { - if (!memcmp(ri->cache_info.signed_descriptor_digest, + if (tor_memeq(ri->cache_info.signed_descriptor_digest, rs->descriptor_digest, DIGEST_LEN)) { if (live_until > ri->cache_info.last_listed_as_valid_until) ri->cache_info.last_listed_as_valid_until = live_until; diff --git a/src/or/onion.c b/src/or/onion.c index e1d10a60bb..211d14c1e1 100644 --- a/src/or/onion.c +++ b/src/or/onion.c @@ -328,7 +328,7 @@ onion_skin_client_handshake(crypto_dh_env_t *handshake_state, if (len < 0) goto err; - if (memcmp(key_material, handshake_reply+DH_KEY_LEN, DIGEST_LEN)) { + if (tor_memneq(key_material, handshake_reply+DH_KEY_LEN, DIGEST_LEN)) { /* H(K) does *not* match. Something fishy. */ log_warn(LD_PROTOCOL,"Digest DOES NOT MATCH on onion handshake. " "Bug or attack."); @@ -415,7 +415,7 @@ fast_client_handshake(const uint8_t *handshake_state,/*DIGEST_LEN bytes*/ if (crypto_expand_key_material(tmp, sizeof(tmp), out, out_len)) { goto done; } - if (memcmp(out, handshake_reply_out+DIGEST_LEN, DIGEST_LEN)) { + if (tor_memneq(out, handshake_reply_out+DIGEST_LEN, DIGEST_LEN)) { /* H(K) does *not* match. Something fishy. */ log_warn(LD_PROTOCOL,"Digest DOES NOT MATCH on fast handshake. " "Bug or attack."); diff --git a/src/or/relay.c b/src/or/relay.c index e5bc310fed..cf531169e7 100644 --- a/src/or/relay.c +++ b/src/or/relay.c @@ -134,7 +134,7 @@ relay_digest_matches(crypto_digest_env_t *digest, cell_t *cell) crypto_digest_add_bytes(digest, (char*) cell->payload, CELL_PAYLOAD_SIZE); crypto_digest_get_digest(digest, calculated_integrity, 4); - if (memcmp(received_integrity, calculated_integrity, 4)) { + if (tor_memneq(received_integrity, calculated_integrity, 4)) { // log_fn(LOG_INFO,"Recognized=0 but bad digest. Not recognizing."); // (%d vs %d).", received_integrity, calculated_integrity); /* restore digest to its old form */ diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 838b8f7423..3a2aaf1c41 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -158,7 +158,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, intro_key = NULL; SMARTLIST_FOREACH(entry->parsed->intro_nodes, rend_intro_point_t *, intro, { - if (!memcmp(introcirc->build_state->chosen_exit->identity_digest, + if (tor_memeq(introcirc->build_state->chosen_exit->identity_digest, intro->extend_info->identity_digest, DIGEST_LEN)) { intro_key = intro->intro_key; break; @@ -629,7 +629,7 @@ rend_client_remove_intro_point(extend_info_t *failed_intro, for (i = 0; i < smartlist_len(ent->parsed->intro_nodes); i++) { rend_intro_point_t *intro = smartlist_get(ent->parsed->intro_nodes, i); - if (!memcmp(failed_intro->identity_digest, + if (tor_memeq(failed_intro->identity_digest, intro->extend_info->identity_digest, DIGEST_LEN)) { rend_intro_point_free(intro); smartlist_del(ent->parsed->intro_nodes, i); @@ -728,7 +728,7 @@ rend_client_receive_rendezvous(origin_circuit_t *circ, const uint8_t *request, goto err; /* Check whether the digest is right... */ - if (memcmp(keys, request+DH_KEY_LEN, DIGEST_LEN)) { + if (tor_memneq(keys, request+DH_KEY_LEN, DIGEST_LEN)) { log_warn(LD_PROTOCOL, "Incorrect digest of key material."); goto err; } diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c index 3ee7419d7b..45044324a3 100644 --- a/src/or/rendcommon.c +++ b/src/or/rendcommon.c @@ -884,15 +884,15 @@ rend_id_is_in_interval(const char *a, const char *b, const char *c) tor_assert(c); /* There are five cases in which a is outside the interval ]b,c]: */ - a_b = memcmp(a,b,DIGEST_LEN); + a_b = tor_memcmp(a,b,DIGEST_LEN); if (a_b == 0) return 0; /* 1. a == b (b is excluded) */ - b_c = memcmp(b,c,DIGEST_LEN); + b_c = tor_memcmp(b,c,DIGEST_LEN); if (b_c == 0) return 0; /* 2. b == c (interval is empty) */ else if (a_b <= 0 && b_c < 0) return 0; /* 3. a b c */ - c_a = memcmp(c,a,DIGEST_LEN); + c_a = tor_memcmp(c,a,DIGEST_LEN); if (c_a < 0 && a_b <= 0) return 0; /* 4. c a b */ else if (b_c < 0 && c_a < 0) @@ -1066,7 +1066,7 @@ rend_cache_store(const char *desc, size_t desc_len, int published) rend_service_descriptor_free(parsed); return 0; } - if (e && e->len == desc_len && !memcmp(desc,e->desc,desc_len)) { + if (e && e->len == desc_len && tor_memeq(desc,e->desc,desc_len)) { log_info(LD_REND,"We already have this service descriptor %s.", safe_str_client(query)); e->received = time(NULL); diff --git a/src/or/rendmid.c b/src/or/rendmid.c index 5e2dd986ba..04edd8e3e2 100644 --- a/src/or/rendmid.c +++ b/src/or/rendmid.c @@ -62,7 +62,7 @@ rend_mid_establish_intro(or_circuit_t *circ, const uint8_t *request, log_warn(LD_BUG, "Internal error computing digest."); goto err; } - if (memcmp(expected_digest, request+2+asn1len, DIGEST_LEN)) { + if (tor_memneq(expected_digest, request+2+asn1len, DIGEST_LEN)) { log_warn(LD_PROTOCOL, "Hash of session info was not as expected."); reason = END_CIRC_REASON_TORPROTOCOL; goto err; diff --git a/src/or/rendservice.c b/src/or/rendservice.c index 767712c329..3d5c80c234 100644 --- a/src/or/rendservice.c +++ b/src/or/rendservice.c @@ -466,7 +466,7 @@ rend_config_services(or_options_t *options, int validate_only) int keep_it = 0; tor_assert(oc->rend_data); SMARTLIST_FOREACH(surviving_services, rend_service_t *, ptr, { - if (!memcmp(ptr->pk_digest, oc->rend_data->rend_pk_digest, + if (tor_memeq(ptr->pk_digest, oc->rend_data->rend_pk_digest, DIGEST_LEN)) { keep_it = 1; break; @@ -761,7 +761,7 @@ static rend_service_t * rend_service_get_by_pk_digest(const char* digest) { SMARTLIST_FOREACH(rend_service_list, rend_service_t*, s, - if (!memcmp(s->pk_digest,digest,DIGEST_LEN)) + if (tor_memeq(s->pk_digest,digest,DIGEST_LEN)) return s); return NULL; } @@ -801,7 +801,7 @@ rend_check_authorization(rend_service_t *service, /* Look up client authorization by descriptor cookie. */ SMARTLIST_FOREACH(service->clients, rend_authorized_client_t *, client, { - if (!memcmp(client->descriptor_cookie, descriptor_cookie, + if (tor_memeq(client->descriptor_cookie, descriptor_cookie, REND_DESC_COOKIE_LEN)) { auth_client = client; break; @@ -915,7 +915,7 @@ rend_service_introduce(origin_circuit_t *circuit, const uint8_t *request, /* first DIGEST_LEN bytes of request is intro or service pk digest */ crypto_pk_get_digest(intro_key, intro_key_digest); - if (memcmp(intro_key_digest, request, DIGEST_LEN)) { + if (tor_memneq(intro_key_digest, request, DIGEST_LEN)) { base32_encode(serviceid, REND_SERVICE_ID_LEN_BASE32+1, (char*)request, REND_SERVICE_ID_LEN); log_warn(LD_REND, "Got an INTRODUCE2 cell for the wrong service (%s).", @@ -1270,7 +1270,7 @@ rend_service_launch_establish_intro(rend_service_t *service, return -1; } - if (memcmp(intro->extend_info->identity_digest, + if (tor_memneq(intro->extend_info->identity_digest, launched->build_state->chosen_exit->identity_digest, DIGEST_LEN)) { char cann[HEX_DIGEST_LEN+1], orig[HEX_DIGEST_LEN+1]; base16_encode(cann, sizeof(cann), @@ -1556,7 +1556,7 @@ find_intro_circuit(rend_intro_point_t *intro, const char *pk_digest) tor_assert(intro); while ((circ = circuit_get_next_by_pk_and_purpose(circ,pk_digest, CIRCUIT_PURPOSE_S_INTRO))) { - if (!memcmp(circ->build_state->chosen_exit->identity_digest, + if (tor_memeq(circ->build_state->chosen_exit->identity_digest, intro->extend_info->identity_digest, DIGEST_LEN) && circ->rend_data) { return circ; @@ -1566,7 +1566,7 @@ find_intro_circuit(rend_intro_point_t *intro, const char *pk_digest) circ = NULL; while ((circ = circuit_get_next_by_pk_and_purpose(circ,pk_digest, CIRCUIT_PURPOSE_S_ESTABLISH_INTRO))) { - if (!memcmp(circ->build_state->chosen_exit->identity_digest, + if (tor_memeq(circ->build_state->chosen_exit->identity_digest, intro->extend_info->identity_digest, DIGEST_LEN) && circ->rend_data) { return circ; @@ -1823,7 +1823,7 @@ rend_services_introduce(void) if (service->desc) { SMARTLIST_FOREACH(service->desc->intro_nodes, rend_intro_point_t *, dintro, { - if (!memcmp(dintro->extend_info->identity_digest, + if (tor_memeq(dintro->extend_info->identity_digest, intro->extend_info->identity_digest, DIGEST_LEN)) { log_info(LD_REND, "The intro point we are giving up on was " "included in the last published descriptor. " diff --git a/src/or/rephist.c b/src/or/rephist.c index 7aa91b8f56..1ab4171a5f 100644 --- a/src/or/rephist.c +++ b/src/or/rephist.c @@ -118,7 +118,7 @@ get_or_history(const char* id) { or_history_t *hist; - if (tor_mem_is_zero(id, DIGEST_LEN)) + if (tor_digest_is_zero(id)) return NULL; hist = digestmap_get(history_map, id); @@ -146,7 +146,7 @@ get_link_history(const char *from_id, const char *to_id) orhist = get_or_history(from_id); if (!orhist) return NULL; - if (tor_mem_is_zero(to_id, DIGEST_LEN)) + if (tor_digest_is_zero(to_id)) return NULL; lhist = (link_history_t*) digestmap_get(orhist->link_history_map, to_id); if (!lhist) { diff --git a/src/or/router.c b/src/or/router.c index 6de069f03f..42b07cb9ad 100644 --- a/src/or/router.c +++ b/src/or/router.c @@ -725,7 +725,7 @@ init_keys(void) ds->type = type; } if (v3_digest_set && (ds->type & V3_DIRINFO) && - memcmp(v3_digest, ds->v3_identity_digest, DIGEST_LEN)) { + tor_memneq(v3_digest, ds->v3_identity_digest, DIGEST_LEN)) { log_warn(LD_DIR, "V3 identity key does not match identity declared in " "DirServer line. Adjusting."); memcpy(ds->v3_identity_digest, v3_digest, DIGEST_LEN); @@ -1267,7 +1267,7 @@ int router_digest_is_me(const char *digest) { return (server_identitykey && - !memcmp(server_identitykey_digest, digest, DIGEST_LEN)); + tor_memeq(server_identitykey_digest, digest, DIGEST_LEN)); } /** Return true iff I'm a server and digest is equal to @@ -1279,7 +1279,7 @@ router_extrainfo_digest_is_me(const char *digest) if (!ei) return 0; - return !memcmp(digest, + return tor_memeq(digest, ei->cache_info.signed_descriptor_digest, DIGEST_LEN); } diff --git a/src/or/routerlist.c b/src/or/routerlist.c index 04f421481d..8d25eaa862 100644 --- a/src/or/routerlist.c +++ b/src/or/routerlist.c @@ -170,7 +170,7 @@ already_have_cert(authority_cert_t *cert) SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c, { - if (!memcmp(c->cache_info.signed_descriptor_digest, + if (tor_memeq(c->cache_info.signed_descriptor_digest, cert->cache_info.signed_descriptor_digest, DIGEST_LEN)) return 1; @@ -384,16 +384,16 @@ authority_cert_get_by_sk_digest(const char *sk_digest) return NULL; if ((c = get_my_v3_authority_cert()) && - !memcmp(c->signing_key_digest, sk_digest, DIGEST_LEN)) + tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN)) return c; if ((c = get_my_v3_legacy_cert()) && - !memcmp(c->signing_key_digest, sk_digest, DIGEST_LEN)) + tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN)) return c; DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) { SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, { - if (!memcmp(cert->signing_key_digest, sk_digest, DIGEST_LEN)) + if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN)) return cert; }); } DIGESTMAP_FOREACH_END; @@ -412,7 +412,7 @@ authority_cert_get_by_digests(const char *id_digest, !(cl = digestmap_get(trusted_dir_certs, id_digest))) return NULL; SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert, - if (!memcmp(cert->signing_key_digest, sk_digest, DIGEST_LEN)) + if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN)) return cert; ); return NULL; @@ -1008,7 +1008,7 @@ router_get_trusteddirserver_by_digest(const char *digest) SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds, { - if (!memcmp(ds->digest, digest, DIGEST_LEN)) + if (tor_memeq(ds->digest, digest, DIGEST_LEN)) return ds; }); @@ -1027,7 +1027,7 @@ trusteddirserver_get_by_v3_auth_digest(const char *digest) SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds, { - if (!memcmp(ds->v3_identity_digest, digest, DIGEST_LEN) && + if (tor_memeq(ds->v3_identity_digest, digest, DIGEST_LEN) && (ds->type & V3_DIRINFO)) return ds; }); @@ -2280,7 +2280,7 @@ hex_digest_nickname_matches(const char *hexdigest, const char *identity_digest, return 0; } - return !memcmp(digest, identity_digest, DIGEST_LEN); + return tor_memeq(digest, identity_digest, DIGEST_LEN); } /* Return true iff router is listed as named in the current @@ -2292,7 +2292,7 @@ router_is_named(const routerinfo_t *router) networkstatus_get_router_digest_by_nickname(router->nickname); return (digest && - !memcmp(digest, router->cache_info.identity_digest, DIGEST_LEN)); + tor_memeq(digest, router->cache_info.identity_digest, DIGEST_LEN)); } /** Return true iff the digest of router's identity key, @@ -2382,7 +2382,7 @@ router_get_by_nickname(const char *nickname, int warn_if_unnamed) if (n_matches <= 1 || router->is_running) best_match = router; } else if (maybedigest && - !memcmp(digest, router->cache_info.identity_digest, DIGEST_LEN) + tor_memeq(digest, router->cache_info.identity_digest, DIGEST_LEN) ) { if (router_hex_digest_matches(router, nickname)) return router; @@ -2459,7 +2459,7 @@ router_digest_is_trusted_dir_type(const char *digest, dirinfo_type_t type) if (authdir_mode(get_options()) && router_digest_is_me(digest)) return 1; SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ent, - if (!memcmp(digest, ent->digest, DIGEST_LEN)) { + if (tor_memeq(digest, ent->digest, DIGEST_LEN)) { return (!type) || ((type & ent->type) != 0); }); return 0; @@ -2608,7 +2608,7 @@ signed_descriptor_get_body_impl(const signed_descriptor_t *desc, tor_assert(r); if (!with_annotations) { - if (memcmp("router ", r, 7) && memcmp("extra-info ", r, 11)) { + if (fast_memcmp("router ", r, 7) && fast_memcmp("extra-info ", r, 11)) { char *cp = tor_strndup(r, 64); log_err(LD_DIR, "descriptor at %p begins with unexpected string %s. " "Is another process running in our data directory? Exiting.", @@ -3086,7 +3086,7 @@ routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old, routerlist_insert(rl, ri_new); return; } - if (memcmp(ri_old->cache_info.identity_digest, + if (tor_memneq(ri_old->cache_info.identity_digest, ri_new->cache_info.identity_digest, DIGEST_LEN)) { /* digests don't match; digestmap_set won't replace */ rimap_remove(rl->identity_map, ri_old->cache_info.identity_digest); @@ -3103,7 +3103,7 @@ routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old, &ri_new->cache_info); } - same_descriptors = ! memcmp(ri_old->cache_info.signed_descriptor_digest, + same_descriptors = tor_memeq(ri_old->cache_info.signed_descriptor_digest, ri_new->cache_info.signed_descriptor_digest, DIGEST_LEN); @@ -3125,7 +3125,7 @@ routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old, sdmap_remove(rl->desc_digest_map, ri_old->cache_info.signed_descriptor_digest); - if (memcmp(ri_old->cache_info.extra_info_digest, + if (tor_memneq(ri_old->cache_info.extra_info_digest, ri_new->cache_info.extra_info_digest, DIGEST_LEN)) { ei_tmp = eimap_remove(rl->extra_info_map, ri_old->cache_info.extra_info_digest); @@ -3224,7 +3224,7 @@ router_set_status(const char *digest, int up) tor_assert(digest); SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, d, - if (!memcmp(d->digest, digest, DIGEST_LEN)) + if (tor_memeq(d->digest, digest, DIGEST_LEN)) d->is_running = up); node = node_get_mutable_by_id(digest); @@ -3348,7 +3348,7 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg, { routerstatus_t *rs = networkstatus_v2_find_mutable_entry(ns, id_digest); - if (rs && !memcmp(rs->descriptor_digest, + if (rs && tor_memeq(rs->descriptor_digest, router->cache_info.signed_descriptor_digest, DIGEST_LEN)) rs->need_to_mirror = 0; @@ -3356,7 +3356,7 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg, if (consensus) { routerstatus_t *rs = networkstatus_vote_find_mutable_entry( consensus, id_digest); - if (rs && !memcmp(rs->descriptor_digest, + if (rs && tor_memeq(rs->descriptor_digest, router->cache_info.signed_descriptor_digest, DIGEST_LEN)) { in_consensus = 1; @@ -3478,7 +3478,7 @@ _compare_old_routers_by_identity(const void **_a, const void **_b) { int i; const signed_descriptor_t *r1 = *_a, *r2 = *_b; - if ((i = memcmp(r1->identity_digest, r2->identity_digest, DIGEST_LEN))) + if ((i = fast_memcmp(r1->identity_digest, r2->identity_digest, DIGEST_LEN))) return i; return (int)(r1->published_on - r2->published_on); } @@ -3526,7 +3526,7 @@ routerlist_remove_old_cached_routers_with_id(time_t now, ident = ((signed_descriptor_t*)smartlist_get(lst, lo))->identity_digest; for (i = lo+1; i <= hi; ++i) { signed_descriptor_t *r = smartlist_get(lst, i); - tor_assert(!memcmp(ident, r->identity_digest, DIGEST_LEN)); + tor_assert(tor_memeq(ident, r->identity_digest, DIGEST_LEN)); } #endif /* Check whether we need to do anything at all. */ @@ -3738,7 +3738,7 @@ routerlist_remove_old_routers(void) cur_id = r->identity_digest; hi = i; } - if (memcmp(cur_id, r->identity_digest, DIGEST_LEN)) { + if (tor_memneq(cur_id, r->identity_digest, DIGEST_LEN)) { routerlist_remove_old_cached_routers_with_id(now, cutoff, i+1, hi, retain); cur_id = r->identity_digest; @@ -3976,7 +3976,7 @@ signed_desc_digest_is_recognized(signed_descriptor_t *desc) if (consensus) { rs = networkstatus_vote_find_entry(consensus, desc->identity_digest); - if (rs && !memcmp(rs->descriptor_digest, + if (rs && tor_memeq(rs->descriptor_digest, desc->signed_descriptor_digest, DIGEST_LEN)) return 1; } @@ -3985,7 +3985,7 @@ signed_desc_digest_is_recognized(signed_descriptor_t *desc) { if (!(rs = networkstatus_v2_find_entry(ns, desc->identity_digest))) continue; - if (!memcmp(rs->descriptor_digest, + if (tor_memeq(rs->descriptor_digest, desc->signed_descriptor_digest, DIGEST_LEN)) return 1; }); @@ -4630,7 +4630,7 @@ update_consensus_router_descriptor_downloads(time_t now, int is_vote, const routerinfo_t *ri; ++n_have; if (!(ri = router_get_by_id_digest(rs->identity_digest)) || - memcmp(ri->cache_info.signed_descriptor_digest, + tor_memneq(ri->cache_info.signed_descriptor_digest, sd->signed_descriptor_digest, DIGEST_LEN)) { /* We have a descriptor with this digest, but either there is no * entry in routerlist with the same ID (!ri), or there is one, @@ -5159,12 +5159,12 @@ routerinfo_incompatible_with_extrainfo(const routerinfo_t *ri, return 1; } - digest_matches = !memcmp(ei->cache_info.signed_descriptor_digest, + digest_matches = tor_memeq(ei->cache_info.signed_descriptor_digest, sd->extra_info_digest, DIGEST_LEN); /* The identity must match exactly to have been generated at the same time * by the same router. */ - if (memcmp(ri->cache_info.identity_digest, ei->cache_info.identity_digest, + if (tor_memneq(ri->cache_info.identity_digest, ei->cache_info.identity_digest, DIGEST_LEN)) { if (msg) *msg = "Extrainfo nickname or identity did not match routerinfo"; goto err; /* different servers */ @@ -5175,7 +5175,7 @@ routerinfo_incompatible_with_extrainfo(const routerinfo_t *ri, if (crypto_pk_public_checksig(ri->identity_pkey, signed_digest, sizeof(signed_digest), ei->pending_sig, ei->pending_sig_len) != DIGEST_LEN || - memcmp(signed_digest, ei->cache_info.signed_descriptor_digest, + tor_memneq(signed_digest, ei->cache_info.signed_descriptor_digest, DIGEST_LEN)) { ei->bad_sig = 1; tor_free(ei->pending_sig); @@ -5271,25 +5271,25 @@ routerlist_assert_ok(const routerlist_t *rl) }); RIMAP_FOREACH(rl->identity_map, d, r) { - tor_assert(!memcmp(r->cache_info.identity_digest, d, DIGEST_LEN)); + tor_assert(tor_memeq(r->cache_info.identity_digest, d, DIGEST_LEN)); } DIGESTMAP_FOREACH_END; SDMAP_FOREACH(rl->desc_digest_map, d, sd) { - tor_assert(!memcmp(sd->signed_descriptor_digest, d, DIGEST_LEN)); + tor_assert(tor_memeq(sd->signed_descriptor_digest, d, DIGEST_LEN)); } DIGESTMAP_FOREACH_END; SDMAP_FOREACH(rl->desc_by_eid_map, d, sd) { tor_assert(!tor_digest_is_zero(d)); tor_assert(sd); - tor_assert(!memcmp(sd->extra_info_digest, d, DIGEST_LEN)); + tor_assert(tor_memeq(sd->extra_info_digest, d, DIGEST_LEN)); } DIGESTMAP_FOREACH_END; EIMAP_FOREACH(rl->extra_info_map, d, ei) { signed_descriptor_t *sd; - tor_assert(!memcmp(ei->cache_info.signed_descriptor_digest, + tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest, d, DIGEST_LEN)); sd = sdmap_get(rl->desc_by_eid_map, ei->cache_info.signed_descriptor_digest); // tor_assert(sd); // XXXX see above if (sd) { - tor_assert(!memcmp(ei->cache_info.signed_descriptor_digest, + tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest, sd->extra_info_digest, DIGEST_LEN)); } } DIGESTMAP_FOREACH_END; @@ -5335,7 +5335,7 @@ static int _compare_routerinfo_by_id_digest(const void **a, const void **b) { routerinfo_t *first = *(routerinfo_t **)a, *second = *(routerinfo_t **)b; - return memcmp(first->cache_info.identity_digest, + return fast_memcmp(first->cache_info.identity_digest, second->cache_info.identity_digest, DIGEST_LEN); } diff --git a/src/or/routerparse.c b/src/or/routerparse.c index 0410e5e37e..3f5aad8dfa 100644 --- a/src/or/routerparse.c +++ b/src/or/routerparse.c @@ -1093,7 +1093,7 @@ check_signature_token(const char *digest, } // log_debug(LD_DIR,"Signed %s hash starts %s", doctype, // hex_str(signed_digest,4)); - if (memcmp(digest, signed_digest, digest_len)) { + if (tor_memneq(digest, signed_digest, digest_len)) { log_warn(LD_DIR, "Error reading %s: signature does not match.", doctype); tor_free(signed_digest); return -1; @@ -1480,7 +1480,7 @@ router_parse_entry_from_string(const char *s, const char *end, escaped(tok->args[0])); goto err; } - if (memcmp(d,router->cache_info.identity_digest, DIGEST_LEN)!=0) { + if (tor_memneq(d,router->cache_info.identity_digest, DIGEST_LEN)) { log_warn(LD_DIR, "Fingerprint '%s' does not match identity digest.", tok->args[0]); goto err; @@ -1795,7 +1795,7 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string) cert->cache_info.identity_digest)) goto err; - if (memcmp(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) { + if (tor_memneq(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) { log_warn(LD_DIR, "Digest of certificate key didn't match declared " "fingerprint"); goto err; @@ -1843,7 +1843,7 @@ authority_cert_parse_from_string(const char *s, const char **end_of_string) * buy us much. */ if (old_cert->cache_info.signed_descriptor_len == len && old_cert->cache_info.signed_descriptor_body && - !memcmp(s, old_cert->cache_info.signed_descriptor_body, len)) { + tor_memeq(s, old_cert->cache_info.signed_descriptor_body, len)) { log_debug(LD_DIR, "We already checked the signature on this " "certificate; no need to do so again."); found = 1; @@ -2203,7 +2203,7 @@ int compare_routerstatus_entries(const void **_a, const void **_b) { const routerstatus_t *a = *_a, *b = *_b; - return memcmp(a->identity_digest, b->identity_digest, DIGEST_LEN); + return fast_memcmp(a->identity_digest, b->identity_digest, DIGEST_LEN); } /** Helper: used in call to _smartlist_uniq to clear out duplicate entries. */ @@ -2296,7 +2296,7 @@ networkstatus_v2_parse_from_string(const char *s) log_warn(LD_DIR, "Couldn't compute signing key digest"); goto err; } - if (memcmp(tmp_digest, ns->identity_digest, DIGEST_LEN)) { + if (tor_memneq(tmp_digest, ns->identity_digest, DIGEST_LEN)) { log_warn(LD_DIR, "network-status fingerprint did not match dir-signing-key"); goto err; @@ -3000,7 +3000,7 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, goto err; } if (ns->type != NS_TYPE_CONSENSUS && - memcmp(ns->cert->cache_info.identity_digest, + tor_memneq(ns->cert->cache_info.identity_digest, voter->identity_digest, DIGEST_LEN)) { log_warn(LD_DIR,"Mismatch between identities in certificate and vote"); goto err; @@ -3106,7 +3106,8 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, rs1 = smartlist_get(ns->routerstatus_list, i-1); rs2 = smartlist_get(ns->routerstatus_list, i); } - if (memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) >= 0) { + if (fast_memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) + >= 0) { log_warn(LD_DIR, "Vote networkstatus entries not sorted by identity " "digest"); goto err; @@ -3225,7 +3226,7 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out, } if (ns->type != NS_TYPE_CONSENSUS) { - if (memcmp(declared_identity, ns->cert->cache_info.identity_digest, + if (tor_memneq(declared_identity, ns->cert->cache_info.identity_digest, DIGEST_LEN)) { log_warn(LD_DIR, "Digest mismatch between declared and actual on " "network-status vote."); @@ -3507,8 +3508,8 @@ networkstatus_parse_detached_signatures(const char *s, const char *eos) is_duplicate = 0; SMARTLIST_FOREACH(siglist, document_signature_t *, s, { if (s->alg == alg && - !memcmp(id_digest, s->identity_digest, DIGEST_LEN) && - !memcmp(sk_digest, s->signing_key_digest, DIGEST_LEN)) { + tor_memeq(id_digest, s->identity_digest, DIGEST_LEN) && + tor_memeq(sk_digest, s->signing_key_digest, DIGEST_LEN)) { is_duplicate = 1; } }); @@ -4546,7 +4547,7 @@ tor_version_compare(tor_version_t *a, tor_version_t *b) else if ((i = a->git_tag_len - b->git_tag_len)) return i; else if (a->git_tag_len) - return memcmp(a->git_tag, b->git_tag, a->git_tag_len); + return fast_memcmp(a->git_tag, b->git_tag, a->git_tag_len); else return 0; } @@ -4765,7 +4766,7 @@ rend_parse_v2_service_descriptor(rend_service_descriptor_t **parsed_out, crypto_pk_get_digest(result->pk, public_key_hash); rend_get_descriptor_id_bytes(test_desc_id, public_key_hash, secret_id_part); - if (memcmp(desc_id_out, test_desc_id, DIGEST_LEN)) { + if (tor_memneq(desc_id_out, test_desc_id, DIGEST_LEN)) { log_warn(LD_REND, "Parsed descriptor ID does not match " "computed descriptor ID."); goto err; @@ -4830,7 +4831,7 @@ rend_decrypt_introduction_points(char **ipos_decrypted, crypto_free_digest_env(digest); for (pos = 2; pos < 2 + client_entries_len; pos += REND_BASIC_AUTH_CLIENT_ENTRY_LEN) { - if (!memcmp(ipos_encrypted + pos, client_id, + if (tor_memeq(ipos_encrypted + pos, client_id, REND_BASIC_AUTH_CLIENT_ID_LEN)) { /* Attempt to decrypt introduction points. */ cipher = crypto_create_init_cipher(descriptor_cookie, 0); @@ -4854,7 +4855,7 @@ rend_decrypt_introduction_points(char **ipos_decrypted, tor_free(dec); return -1; } - if (memcmpstart(dec, declen, "introduction-point ")) { + if (fast_memcmpstart(dec, declen, "introduction-point ")) { log_warn(LD_REND, "Decrypted introduction points don't " "look like we could parse them."); tor_free(dec); @@ -4923,7 +4924,7 @@ rend_parse_introduction_points(rend_service_descriptor_t *parsed, parsed->intro_nodes = smartlist_create(); area = memarea_new(); - while (!memcmpstart(current_ipo, end_of_intro_points-current_ipo, + while (!fast_memcmpstart(current_ipo, end_of_intro_points-current_ipo, "introduction-point ")) { /* Determine end of string. */ const char *eos = tor_memstr(current_ipo, end_of_intro_points-current_ipo, diff --git a/src/test/test_util.c b/src/test/test_util.c index efbc47b460..f4b17c9a5d 100644 --- a/src/test/test_util.c +++ b/src/test/test_util.c @@ -1418,6 +1418,60 @@ test_util_spawn_background_fail(void *ptr) } #endif + +static void +test_util_di_ops(void) +{ +#define LT -1 +#define GT 1 +#define EQ 0 + const struct { + const char *a; int want_sign; const char *b; + } examples[] = { + { "Foo", EQ, "Foo" }, + { "foo", GT, "bar", }, + { "foobar", EQ ,"foobar" }, + { "foobar", LT, "foobaw" }, + { "foobar", GT, "f00bar" }, + { "foobar", GT, "boobar" }, + { "", EQ, "" }, + { NULL, 0, NULL }, + }; + + int i; + + for (i = 0; examples[i].a; ++i) { + size_t len = strlen(examples[i].a); + int eq1, eq2, neq1, neq2, cmp1, cmp2; + test_eq(len, strlen(examples[i].b)); + /* We do all of the operations, with operands in both orders. */ + eq1 = tor_memeq(examples[i].a, examples[i].b, len); + eq2 = tor_memeq(examples[i].b, examples[i].a, len); + neq1 = tor_memneq(examples[i].a, examples[i].b, len); + neq2 = tor_memneq(examples[i].b, examples[i].a, len); + cmp1 = tor_memcmp(examples[i].a, examples[i].b, len); + cmp2 = tor_memcmp(examples[i].b, examples[i].a, len); + + /* Check for correctness of cmp1 */ + if (cmp1 < 0 && examples[i].want_sign != LT) + test_fail(); + else if (cmp1 > 0 && examples[i].want_sign != GT) + test_fail(); + else if (cmp1 == 0 && examples[i].want_sign != EQ) + test_fail(); + + /* Check for consistency of everything else with cmp1 */ + test_eq(eq1, eq2); + test_eq(neq1, neq2); + test_eq(cmp1, -cmp2); + test_eq(eq1, cmp1 == 0); + test_eq(neq1, !eq1); + } + + done: + ; +} + #define UTIL_LEGACY(name) \ { #name, legacy_test_helper, 0, &legacy_setup, test_util_ ## name } @@ -1438,6 +1492,7 @@ struct testcase_t util_tests[] = { UTIL_LEGACY(threads), UTIL_LEGACY(sscanf), UTIL_LEGACY(strtok), + UTIL_LEGACY(di_ops), UTIL_TEST(find_str_at_start_of_line, 0), UTIL_TEST(asprintf, 0), UTIL_TEST(listdir, 0),