/* Copyright (c) 2001 Matej Pfajfar. * Copyright (c) 2001-2004, Roger Dingledine. * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. * Copyright (c) 2007-2018, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** * \file routerparse.c * \brief Code to parse and validate router descriptors, consenus directories, * and similar objects. * * The objects parsed by this module use a common text-based metaformat, * documented in dir-spec.txt in torspec.git. This module is itself divided * into two major kinds of function: code to handle the metaformat, and code * to convert from particular instances of the metaformat into the * objects that Tor uses. * * The generic parsing code works by calling a table-based tokenizer on the * input string. Each token corresponds to a single line with a token, plus * optional arguments on that line, plus an optional base-64 encoded object * after that line. Each token has a definition in a table of token_rule_t * entries that describes how many arguments it can take, whether it takes an * object, how many times it may appear, whether it must appear first, and so * on. * * The tokenizer function tokenize_string() converts its string input into a * smartlist full of instances of directory_token_t, according to a provided * table of token_rule_t. * * The generic parts of this module additionally include functions for * finding the start and end of signed information inside a signed object, and * computing the digest that will be signed. * * There are also functions for saving objects to disk that have caused * parsing to fail. * * The specific parts of this module describe conversions between * particular lists of directory_token_t and particular objects. The * kinds of objects that can be parsed here are: * **/ #define ROUTERPARSE_PRIVATE #include "core/or/or.h" #include "app/config/config.h" #include "core/or/circuitstats.h" #include "core/or/policies.h" #include "core/or/protover.h" #include "feature/client/entrynodes.h" #include "feature/dirauth/shared_random.h" #include "feature/dircommon/voting_schedule.h" #include "feature/dirparse/parsecommon.h" #include "feature/dirparse/routerparse.h" #include "feature/hs_common/shared_random_client.h" #include "feature/nodelist/authcert.h" #include "feature/nodelist/describe.h" #include "feature/nodelist/microdesc.h" #include "feature/nodelist/networkstatus.h" #include "feature/nodelist/nickname.h" #include "feature/nodelist/routerinfo.h" #include "feature/nodelist/routerlist.h" #include "feature/nodelist/torcert.h" #include "feature/relay/router.h" #include "feature/relay/routerkeys.h" #include "feature/rend/rendcommon.h" #include "feature/stats/rephist.h" #include "lib/crypt_ops/crypto_format.h" #include "lib/crypt_ops/crypto_util.h" #include "lib/memarea/memarea.h" #include "lib/sandbox/sandbox.h" #include "feature/dirparse/authcert_parse.h" #include "feature/dirparse/sigcommon.h" #include "feature/dirparse/unparseable.h" #include "feature/dirauth/dirvote.h" #include "core/or/addr_policy_st.h" #include "feature/nodelist/authority_cert_st.h" #include "feature/nodelist/document_signature_st.h" #include "core/or/extend_info_st.h" #include "feature/nodelist/extrainfo_st.h" #include "feature/nodelist/microdesc_st.h" #include "feature/nodelist/networkstatus_st.h" #include "feature/nodelist/networkstatus_voter_info_st.h" #include "feature/dirauth/ns_detached_signatures_st.h" #include "feature/rend/rend_authorized_client_st.h" #include "feature/rend/rend_intro_point_st.h" #include "feature/rend/rend_service_descriptor_st.h" #include "feature/nodelist/routerinfo_st.h" #include "feature/nodelist/routerlist_st.h" #include "core/or/tor_version_st.h" #include "feature/dirauth/vote_microdesc_hash_st.h" #include "feature/nodelist/vote_routerstatus_st.h" #include "lib/container/bloomfilt.h" #undef log #include /****************************************************************************/ /** List of tokens recognized in router descriptors */ static token_rule_t routerdesc_token_table[] = { T0N("reject", K_REJECT, ARGS, NO_OBJ ), T0N("accept", K_ACCEPT, ARGS, NO_OBJ ), T0N("reject6", K_REJECT6, ARGS, NO_OBJ ), T0N("accept6", K_ACCEPT6, ARGS, NO_OBJ ), T1_START( "router", K_ROUTER, GE(5), NO_OBJ ), T01("ipv6-policy", K_IPV6_POLICY, CONCAT_ARGS, NO_OBJ), T1( "signing-key", K_SIGNING_KEY, NO_ARGS, NEED_KEY_1024 ), T1( "onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024 ), T01("ntor-onion-key", K_ONION_KEY_NTOR, GE(1), NO_OBJ ), T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ), T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), T01("uptime", K_UPTIME, GE(1), NO_OBJ ), T01("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), T01("hibernating", K_HIBERNATING, GE(1), NO_OBJ ), T01("platform", K_PLATFORM, CONCAT_ARGS, NO_OBJ ), T01("proto", K_PROTO, CONCAT_ARGS, NO_OBJ ), T01("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ), T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ), T01("extra-info-digest", K_EXTRA_INFO_DIGEST, GE(1), NO_OBJ ), T01("hidden-service-dir", K_HIDDEN_SERVICE_DIR, NO_ARGS, NO_OBJ ), T01("identity-ed25519", K_IDENTITY_ED25519, NO_ARGS, NEED_OBJ ), T01("master-key-ed25519", K_MASTER_KEY_ED25519, GE(1), NO_OBJ ), T01("router-sig-ed25519", K_ROUTER_SIG_ED25519, GE(1), NO_OBJ ), T01("onion-key-crosscert", K_ONION_KEY_CROSSCERT, NO_ARGS, NEED_OBJ ), T01("ntor-onion-key-crosscert", K_NTOR_ONION_KEY_CROSSCERT, EQ(1), NEED_OBJ ), T01("allow-single-hop-exits",K_ALLOW_SINGLE_HOP_EXITS, NO_ARGS, NO_OBJ ), T01("family", K_FAMILY, ARGS, NO_OBJ ), T01("caches-extra-info", K_CACHES_EXTRA_INFO, NO_ARGS, NO_OBJ ), T0N("or-address", K_OR_ADDRESS, GE(1), NO_OBJ ), T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), T1( "bandwidth", K_BANDWIDTH, GE(3), NO_OBJ ), A01("@purpose", A_PURPOSE, GE(1), NO_OBJ ), T01("tunnelled-dir-server",K_DIR_TUNNELLED, NO_ARGS, NO_OBJ ), END_OF_TABLE }; /** List of tokens recognized in extra-info documents. */ static token_rule_t extrainfo_token_table[] = { T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ), T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), T01("identity-ed25519", K_IDENTITY_ED25519, NO_ARGS, NEED_OBJ ), T01("router-sig-ed25519", K_ROUTER_SIG_ED25519, GE(1), NO_OBJ ), T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ), T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ), T01("dirreq-stats-end", K_DIRREQ_END, ARGS, NO_OBJ ), T01("dirreq-v2-ips", K_DIRREQ_V2_IPS, ARGS, NO_OBJ ), T01("dirreq-v3-ips", K_DIRREQ_V3_IPS, ARGS, NO_OBJ ), T01("dirreq-v2-reqs", K_DIRREQ_V2_REQS, ARGS, NO_OBJ ), T01("dirreq-v3-reqs", K_DIRREQ_V3_REQS, ARGS, NO_OBJ ), T01("dirreq-v2-share", K_DIRREQ_V2_SHARE, ARGS, NO_OBJ ), T01("dirreq-v3-share", K_DIRREQ_V3_SHARE, ARGS, NO_OBJ ), T01("dirreq-v2-resp", K_DIRREQ_V2_RESP, ARGS, NO_OBJ ), T01("dirreq-v3-resp", K_DIRREQ_V3_RESP, ARGS, NO_OBJ ), T01("dirreq-v2-direct-dl", K_DIRREQ_V2_DIR, ARGS, NO_OBJ ), T01("dirreq-v3-direct-dl", K_DIRREQ_V3_DIR, ARGS, NO_OBJ ), T01("dirreq-v2-tunneled-dl", K_DIRREQ_V2_TUN, ARGS, NO_OBJ ), T01("dirreq-v3-tunneled-dl", K_DIRREQ_V3_TUN, ARGS, NO_OBJ ), T01("entry-stats-end", K_ENTRY_END, ARGS, NO_OBJ ), T01("entry-ips", K_ENTRY_IPS, ARGS, NO_OBJ ), T01("cell-stats-end", K_CELL_END, ARGS, NO_OBJ ), T01("cell-processed-cells", K_CELL_PROCESSED, ARGS, NO_OBJ ), T01("cell-queued-cells", K_CELL_QUEUED, ARGS, NO_OBJ ), T01("cell-time-in-queue", K_CELL_TIME, ARGS, NO_OBJ ), T01("cell-circuits-per-decile", K_CELL_CIRCS, ARGS, NO_OBJ ), T01("exit-stats-end", K_EXIT_END, ARGS, NO_OBJ ), T01("exit-kibibytes-written", K_EXIT_WRITTEN, ARGS, NO_OBJ ), T01("exit-kibibytes-read", K_EXIT_READ, ARGS, NO_OBJ ), T01("exit-streams-opened", K_EXIT_OPENED, ARGS, NO_OBJ ), T1_START( "extra-info", K_EXTRA_INFO, GE(2), NO_OBJ ), END_OF_TABLE }; /** List of tokens recognized in the body part of v3 networkstatus * documents. */ static token_rule_t rtrstatus_token_table[] = { T01("p", K_P, CONCAT_ARGS, NO_OBJ ), T1( "r", K_R, GE(7), NO_OBJ ), T0N("a", K_A, GE(1), NO_OBJ ), T1( "s", K_S, ARGS, NO_OBJ ), T01("v", K_V, CONCAT_ARGS, NO_OBJ ), T01("w", K_W, ARGS, NO_OBJ ), T0N("m", K_M, CONCAT_ARGS, NO_OBJ ), T0N("id", K_ID, GE(2), NO_OBJ ), T01("pr", K_PROTO, CONCAT_ARGS, NO_OBJ ), T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), END_OF_TABLE }; /** List of tokens recognized in V3 networkstatus votes. */ static token_rule_t networkstatus_token_table[] = { T1_START("network-status-version", K_NETWORK_STATUS_VERSION, GE(1), NO_OBJ ), T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), T1("published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), T1("known-flags", K_KNOWN_FLAGS, ARGS, NO_OBJ ), T01("params", K_PARAMS, ARGS, NO_OBJ ), T( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), T01("signing-ed25519", K_SIGNING_CERT_ED, NO_ARGS , NEED_OBJ ), T01("shared-rand-participate",K_SR_FLAG, NO_ARGS, NO_OBJ ), T0N("shared-rand-commit", K_COMMIT, GE(3), NO_OBJ ), T01("shared-rand-previous-value", K_PREVIOUS_SRV,EQ(2), NO_OBJ ), T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), T0N("package", K_PACKAGE, CONCAT_ARGS, NO_OBJ ), T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), #include "feature/dirparse/authcert_members.i" T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), T1( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), T1( "dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), T01("legacy-dir-key", K_LEGACY_DIR_KEY, GE(1), NO_OBJ ), T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), T1( "consensus-methods", K_CONSENSUS_METHODS, GE(1), NO_OBJ ), END_OF_TABLE }; /** List of tokens recognized in V3 networkstatus consensuses. */ static token_rule_t networkstatus_consensus_token_table[] = { T1_START("network-status-version", K_NETWORK_STATUS_VERSION, GE(1), NO_OBJ ), T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), T1N("dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), T1N("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), T1N("vote-digest", K_VOTE_DIGEST, GE(1), NO_OBJ ), T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), T01("consensus-method", K_CONSENSUS_METHOD, EQ(1), NO_OBJ), T01("params", K_PARAMS, ARGS, NO_OBJ ), T01("shared-rand-previous-value", K_PREVIOUS_SRV, EQ(2), NO_OBJ ), T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, CONCAT_ARGS, NO_OBJ ), END_OF_TABLE }; /** List of tokens recognized in the footer of v1 directory footers. */ static token_rule_t networkstatus_vote_footer_token_table[] = { T01("directory-footer", K_DIRECTORY_FOOTER, NO_ARGS, NO_OBJ ), T01("bandwidth-weights", K_BW_WEIGHTS, ARGS, NO_OBJ ), T( "directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ), END_OF_TABLE }; /** List of tokens recognized in detached networkstatus signature documents. */ static token_rule_t networkstatus_detached_signature_token_table[] = { T1_START("consensus-digest", K_CONSENSUS_DIGEST, GE(1), NO_OBJ ), T("additional-digest", K_ADDITIONAL_DIGEST,GE(3), NO_OBJ ), T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), T("additional-signature", K_ADDITIONAL_SIGNATURE, GE(4), NEED_OBJ ), T1N("directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ), END_OF_TABLE }; /** List of tokens recognized in microdescriptors */ static token_rule_t microdesc_token_table[] = { T1_START("onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024), T01("ntor-onion-key", K_ONION_KEY_NTOR, GE(1), NO_OBJ ), T0N("id", K_ID, GE(2), NO_OBJ ), T0N("a", K_A, GE(1), NO_OBJ ), T01("family", K_FAMILY, ARGS, NO_OBJ ), T01("p", K_P, CONCAT_ARGS, NO_OBJ ), T01("p6", K_P6, CONCAT_ARGS, NO_OBJ ), A01("@last-listed", A_LAST_LISTED, CONCAT_ARGS, NO_OBJ ), END_OF_TABLE }; #undef T /* static function prototypes */ static int router_add_exit_policy(routerinfo_t *router,directory_token_t *tok); static addr_policy_t *router_parse_addr_policy(directory_token_t *tok, unsigned fmt_flags); static addr_policy_t *router_parse_addr_policy_private(directory_token_t *tok); static smartlist_t *find_all_exitpolicy(smartlist_t *s); /** Set digest to the SHA-1 digest of the hash of the directory in * s. Return 0 on success, -1 on failure. */ int router_get_dir_hash(const char *s, char *digest) { return router_get_hash_impl(s, strlen(s), digest, "signed-directory","\ndirectory-signature",'\n', DIGEST_SHA1); } /** Set digest to the SHA-1 digest of the hash of the first router in * s. Return 0 on success, -1 on failure. */ int router_get_router_hash(const char *s, size_t s_len, char *digest) { return router_get_hash_impl(s, s_len, digest, "router ","\nrouter-signature", '\n', DIGEST_SHA1); } /** Try to find the start and end of the signed portion of a networkstatus * document in s. On success, set start_out to the first * character of the document, and end_out to a position one after the * final character of the signed document, and return 0. On failure, return * -1. */ int router_get_networkstatus_v3_signed_boundaries(const char *s, const char **start_out, const char **end_out) { return router_get_hash_impl_helper(s, strlen(s), "network-status-version", "\ndirectory-signature", ' ', LOG_INFO, start_out, end_out); } /** Set digest_out to the SHA3-256 digest of the signed portion of the * networkstatus vote in s -- or of the entirety of s if no * signed portion can be identified. Return 0 on success, -1 on failure. */ int router_get_networkstatus_v3_sha3_as_signed(uint8_t *digest_out, const char *s) { const char *start, *end; if (router_get_networkstatus_v3_signed_boundaries(s, &start, &end) < 0) { start = s; end = s + strlen(s); } tor_assert(start); tor_assert(end); return crypto_digest256((char*)digest_out, start, end-start, DIGEST_SHA3_256); } /** Set digests to all the digests of the consensus document in * s */ int router_get_networkstatus_v3_hashes(const char *s, common_digests_t *digests) { return router_get_hashes_impl(s,strlen(s),digests, "network-status-version", "\ndirectory-signature", ' '); } /** Set digest to the SHA-1 digest of the hash of the s_len-byte * extrainfo string at s. Return 0 on success, -1 on failure. */ int router_get_extrainfo_hash(const char *s, size_t s_len, char *digest) { return router_get_hash_impl(s, s_len, digest, "extra-info", "\nrouter-signature",'\n', DIGEST_SHA1); } /** Helper: move *s_ptr ahead to the next router, the next extra-info, * or to the first of the annotations proceeding the next router or * extra-info---whichever comes first. Set is_extrainfo_out to true if * we found an extrainfo, or false if found a router. Do not scan beyond * eos. Return -1 if we found nothing; 0 if we found something. */ static int find_start_of_next_router_or_extrainfo(const char **s_ptr, const char *eos, int *is_extrainfo_out) { const char *annotations = NULL; const char *s = *s_ptr; s = eat_whitespace_eos(s, eos); while (s < eos-32) { /* 32 gives enough room for a the first keyword. */ /* We're at the start of a line. */ tor_assert(*s != '\n'); if (*s == '@' && !annotations) { annotations = s; } else if (*s == 'r' && !strcmpstart(s, "router ")) { *s_ptr = annotations ? annotations : s; *is_extrainfo_out = 0; return 0; } else if (*s == 'e' && !strcmpstart(s, "extra-info ")) { *s_ptr = annotations ? annotations : s; *is_extrainfo_out = 1; return 0; } if (!(s = memchr(s+1, '\n', eos-(s+1)))) break; s = eat_whitespace_eos(s, eos); } return -1; } /** Given a string *s containing a concatenated sequence of router * descriptors (or extra-info documents if want_extrainfo is set), * parses them and stores the result in dest. All routers are marked * running and valid. Advances *s to a point immediately following the last * router entry. Ignore any trailing router entries that are not complete. * * If saved_location isn't SAVED_IN_CACHE, make a local copy of each * descriptor in the signed_descriptor_body field of each routerinfo_t. If it * isn't SAVED_NOWHERE, remember the offset of each descriptor. * * Returns 0 on success and -1 on failure. Adds a digest to * invalid_digests_out for every entry that was unparseable or * invalid. (This may cause duplicate entries.) */ int router_parse_list_from_string(const char **s, const char *eos, smartlist_t *dest, saved_location_t saved_location, int want_extrainfo, int allow_annotations, const char *prepend_annotations, smartlist_t *invalid_digests_out) { routerinfo_t *router; extrainfo_t *extrainfo; signed_descriptor_t *signed_desc = NULL; void *elt; const char *end, *start; int have_extrainfo; tor_assert(s); tor_assert(*s); tor_assert(dest); start = *s; if (!eos) eos = *s + strlen(*s); tor_assert(eos >= *s); while (1) { char raw_digest[DIGEST_LEN]; int have_raw_digest = 0; int dl_again = 0; if (find_start_of_next_router_or_extrainfo(s, eos, &have_extrainfo) < 0) break; end = tor_memstr(*s, eos-*s, "\nrouter-signature"); if (end) end = tor_memstr(end, eos-end, "\n-----END SIGNATURE-----\n"); if (end) end += strlen("\n-----END SIGNATURE-----\n"); if (!end) break; elt = NULL; if (have_extrainfo && want_extrainfo) { routerlist_t *rl = router_get_routerlist(); have_raw_digest = router_get_extrainfo_hash(*s, end-*s, raw_digest) == 0; extrainfo = extrainfo_parse_entry_from_string(*s, end, saved_location != SAVED_IN_CACHE, rl->identity_map, &dl_again); if (extrainfo) { signed_desc = &extrainfo->cache_info; elt = extrainfo; } } else if (!have_extrainfo && !want_extrainfo) { have_raw_digest = router_get_router_hash(*s, end-*s, raw_digest) == 0; router = router_parse_entry_from_string(*s, end, saved_location != SAVED_IN_CACHE, allow_annotations, prepend_annotations, &dl_again); if (router) { log_debug(LD_DIR, "Read router '%s', purpose '%s'", router_describe(router), router_purpose_to_string(router->purpose)); signed_desc = &router->cache_info; elt = router; } } if (! elt && ! dl_again && have_raw_digest && invalid_digests_out) { smartlist_add(invalid_digests_out, tor_memdup(raw_digest, DIGEST_LEN)); } if (!elt) { *s = end; continue; } if (saved_location != SAVED_NOWHERE) { tor_assert(signed_desc); signed_desc->saved_location = saved_location; signed_desc->saved_offset = *s - start; } *s = end; smartlist_add(dest, elt); } return 0; } /* For debugging: define to count every descriptor digest we've seen so we * know if we need to try harder to avoid duplicate verifies. */ #undef COUNT_DISTINCT_DIGESTS #ifdef COUNT_DISTINCT_DIGESTS static digestmap_t *verified_digests = NULL; #endif /** Log the total count of the number of distinct router digests we've ever * verified. When compared to the number of times we've verified routerdesc * signatures in toto, this will tell us if we're doing too much * multiple-verification. */ void dump_distinct_digest_count(int severity) { #ifdef COUNT_DISTINCT_DIGESTS if (!verified_digests) verified_digests = digestmap_new(); tor_log(severity, LD_GENERAL, "%d *distinct* router digests verified", digestmap_size(verified_digests)); #else /* !(defined(COUNT_DISTINCT_DIGESTS)) */ (void)severity; /* suppress "unused parameter" warning */ #endif /* defined(COUNT_DISTINCT_DIGESTS) */ } /** Try to find an IPv6 OR port in list of directory_token_t's * with at least one argument (use GE(1) in setup). If found, store * address and port number to addr_out and * port_out. Return number of OR ports found. */ static int find_single_ipv6_orport(const smartlist_t *list, tor_addr_t *addr_out, uint16_t *port_out) { int ret = 0; tor_assert(list != NULL); tor_assert(addr_out != NULL); tor_assert(port_out != NULL); SMARTLIST_FOREACH_BEGIN(list, directory_token_t *, t) { tor_addr_t a; maskbits_t bits; uint16_t port_min, port_max; tor_assert(t->n_args >= 1); /* XXXX Prop186 the full spec allows much more than this. */ if (tor_addr_parse_mask_ports(t->args[0], 0, &a, &bits, &port_min, &port_max) == AF_INET6 && bits == 128 && port_min == port_max) { /* Okay, this is one we can understand. Use it and ignore any potential more addresses in list. */ tor_addr_copy(addr_out, &a); *port_out = port_min; ret = 1; break; } } SMARTLIST_FOREACH_END(t); return ret; } /** Helper function: reads a single router entry from *s ... * *end. Mallocs a new router and returns it if all goes well, else * returns NULL. If cache_copy is true, duplicate the contents of * s through end into the signed_descriptor_body of the resulting * routerinfo_t. * * If end is NULL, s must be properly NUL-terminated. * * If allow_annotations, it's okay to encounter annotations in s * before the router; if it's false, reject the router if it's annotated. If * prepend_annotations is set, it should contain some annotations: * append them to the front of the router before parsing it, and keep them * around when caching the router. * * Only one of allow_annotations and prepend_annotations may be set. * * If can_dl_again_out is provided, set *can_dl_again_out to 1 * if it's okay to try to download a descriptor with this same digest again, * and 0 if it isn't. (It might not be okay to download it again if part of * the part covered by the digest is invalid.) */ routerinfo_t * router_parse_entry_from_string(const char *s, const char *end, int cache_copy, int allow_annotations, const char *prepend_annotations, int *can_dl_again_out) { routerinfo_t *router = NULL; char digest[128]; smartlist_t *tokens = NULL, *exit_policy_tokens = NULL; directory_token_t *tok; struct in_addr in; const char *start_of_annotations, *cp, *s_dup = s; size_t prepend_len = prepend_annotations ? strlen(prepend_annotations) : 0; int ok = 1; memarea_t *area = NULL; tor_cert_t *ntor_cc_cert = NULL; /* Do not set this to '1' until we have parsed everything that we intend to * parse that's covered by the hash. */ int can_dl_again = 0; crypto_pk_t *rsa_pubkey = NULL; tor_assert(!allow_annotations || !prepend_annotations); if (!end) { end = s + strlen(s); } /* point 'end' to a point immediately after the final newline. */ while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n') --end; area = memarea_new(); tokens = smartlist_new(); if (prepend_annotations) { if (tokenize_string(area,prepend_annotations,NULL,tokens, routerdesc_token_table,TS_NOCHECK)) { log_warn(LD_DIR, "Error tokenizing router descriptor (annotations)."); goto err; } } start_of_annotations = s; cp = tor_memstr(s, end-s, "\nrouter "); if (!cp) { if (end-s < 7 || strcmpstart(s, "router ")) { log_warn(LD_DIR, "No router keyword found."); goto err; } } else { s = cp+1; } if (start_of_annotations != s) { /* We have annotations */ if (allow_annotations) { if (tokenize_string(area,start_of_annotations,s,tokens, routerdesc_token_table,TS_NOCHECK)) { log_warn(LD_DIR, "Error tokenizing router descriptor (annotations)."); goto err; } } else { log_warn(LD_DIR, "Found unexpected annotations on router descriptor not " "loaded from disk. Dropping it."); goto err; } } if (router_get_router_hash(s, end - s, digest) < 0) { log_warn(LD_DIR, "Couldn't compute router hash."); goto err; } { int flags = 0; if (allow_annotations) flags |= TS_ANNOTATIONS_OK; if (prepend_annotations) flags |= TS_ANNOTATIONS_OK|TS_NO_NEW_ANNOTATIONS; if (tokenize_string(area,s,end,tokens,routerdesc_token_table, flags)) { log_warn(LD_DIR, "Error tokenizing router descriptor."); goto err; } } if (smartlist_len(tokens) < 2) { log_warn(LD_DIR, "Impossibly short router descriptor."); goto err; } tok = find_by_keyword(tokens, K_ROUTER); const int router_token_pos = smartlist_pos(tokens, tok); tor_assert(tok->n_args >= 5); router = tor_malloc_zero(sizeof(routerinfo_t)); router->cert_expiration_time = TIME_MAX; router->cache_info.routerlist_index = -1; router->cache_info.annotations_len = s-start_of_annotations + prepend_len; router->cache_info.signed_descriptor_len = end-s; if (cache_copy) { size_t len = router->cache_info.signed_descriptor_len + router->cache_info.annotations_len; char *signed_body = router->cache_info.signed_descriptor_body = tor_malloc(len+1); if (prepend_annotations) { memcpy(signed_body, prepend_annotations, prepend_len); signed_body += prepend_len; } /* This assertion will always succeed. * len == signed_desc_len + annotations_len * == end-s + s-start_of_annotations + prepend_len * == end-start_of_annotations + prepend_len * We already wrote prepend_len bytes into the buffer; now we're * writing end-start_of_annotations -NM. */ tor_assert(signed_body+(end-start_of_annotations) == router->cache_info.signed_descriptor_body+len); memcpy(signed_body, start_of_annotations, end-start_of_annotations); router->cache_info.signed_descriptor_body[len] = '\0'; tor_assert(strlen(router->cache_info.signed_descriptor_body) == len); } memcpy(router->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); router->nickname = tor_strdup(tok->args[0]); if (!is_legal_nickname(router->nickname)) { log_warn(LD_DIR,"Router nickname is invalid"); goto err; } if (!tor_inet_aton(tok->args[1], &in)) { log_warn(LD_DIR,"Router address is not an IP address."); goto err; } router->addr = ntohl(in.s_addr); router->or_port = (uint16_t) tor_parse_long(tok->args[2],10,0,65535,&ok,NULL); if (!ok) { log_warn(LD_DIR,"Invalid OR port %s", escaped(tok->args[2])); goto err; } router->dir_port = (uint16_t) tor_parse_long(tok->args[4],10,0,65535,&ok,NULL); if (!ok) { log_warn(LD_DIR,"Invalid dir port %s", escaped(tok->args[4])); goto err; } tok = find_by_keyword(tokens, K_BANDWIDTH); tor_assert(tok->n_args >= 3); router->bandwidthrate = (int) tor_parse_long(tok->args[0],10,1,INT_MAX,&ok,NULL); if (!ok) { log_warn(LD_DIR, "bandwidthrate %s unreadable or 0. Failing.", escaped(tok->args[0])); goto err; } router->bandwidthburst = (int) tor_parse_long(tok->args[1],10,0,INT_MAX,&ok,NULL); if (!ok) { log_warn(LD_DIR, "Invalid bandwidthburst %s", escaped(tok->args[1])); goto err; } router->bandwidthcapacity = (int) tor_parse_long(tok->args[2],10,0,INT_MAX,&ok,NULL); if (!ok) { log_warn(LD_DIR, "Invalid bandwidthcapacity %s", escaped(tok->args[1])); goto err; } if ((tok = find_opt_by_keyword(tokens, A_PURPOSE))) { tor_assert(tok->n_args); router->purpose = router_purpose_from_string(tok->args[0]); } else { router->purpose = ROUTER_PURPOSE_GENERAL; } router->cache_info.send_unencrypted = (router->purpose == ROUTER_PURPOSE_GENERAL) ? 1 : 0; if ((tok = find_opt_by_keyword(tokens, K_UPTIME))) { tor_assert(tok->n_args >= 1); router->uptime = tor_parse_long(tok->args[0],10,0,LONG_MAX,&ok,NULL); if (!ok) { log_warn(LD_DIR, "Invalid uptime %s", escaped(tok->args[0])); goto err; } } if ((tok = find_opt_by_keyword(tokens, K_HIBERNATING))) { tor_assert(tok->n_args >= 1); router->is_hibernating = (tor_parse_long(tok->args[0],10,0,LONG_MAX,NULL,NULL) != 0); } tok = find_by_keyword(tokens, K_PUBLISHED); tor_assert(tok->n_args == 1); if (parse_iso_time(tok->args[0], &router->cache_info.published_on) < 0) goto err; tok = find_by_keyword(tokens, K_ONION_KEY); if (!crypto_pk_public_exponent_ok(tok->key)) { log_warn(LD_DIR, "Relay's onion key had invalid exponent."); goto err; } router_set_rsa_onion_pkey(tok->key, &router->onion_pkey, &router->onion_pkey_len); crypto_pk_free(tok->key); if ((tok = find_opt_by_keyword(tokens, K_ONION_KEY_NTOR))) { curve25519_public_key_t k; tor_assert(tok->n_args >= 1); if (curve25519_public_from_base64(&k, tok->args[0]) < 0) { log_warn(LD_DIR, "Bogus ntor-onion-key in routerinfo"); goto err; } router->onion_curve25519_pkey = tor_memdup(&k, sizeof(curve25519_public_key_t)); } tok = find_by_keyword(tokens, K_SIGNING_KEY); router->identity_pkey = tok->key; tok->key = NULL; /* Prevent free */ if (crypto_pk_get_digest(router->identity_pkey, router->cache_info.identity_digest)) { log_warn(LD_DIR, "Couldn't calculate key digest"); goto err; } { directory_token_t *ed_sig_tok, *ed_cert_tok, *cc_tap_tok, *cc_ntor_tok, *master_key_tok; ed_sig_tok = find_opt_by_keyword(tokens, K_ROUTER_SIG_ED25519); ed_cert_tok = find_opt_by_keyword(tokens, K_IDENTITY_ED25519); master_key_tok = find_opt_by_keyword(tokens, K_MASTER_KEY_ED25519); cc_tap_tok = find_opt_by_keyword(tokens, K_ONION_KEY_CROSSCERT); cc_ntor_tok = find_opt_by_keyword(tokens, K_NTOR_ONION_KEY_CROSSCERT); int n_ed_toks = !!ed_sig_tok + !!ed_cert_tok + !!cc_tap_tok + !!cc_ntor_tok; if ((n_ed_toks != 0 && n_ed_toks != 4) || (n_ed_toks == 4 && !router->onion_curve25519_pkey)) { log_warn(LD_DIR, "Router descriptor with only partial ed25519/" "cross-certification support"); goto err; } if (master_key_tok && !ed_sig_tok) { log_warn(LD_DIR, "Router descriptor has ed25519 master key but no " "certificate"); goto err; } if (ed_sig_tok) { tor_assert(ed_cert_tok && cc_tap_tok && cc_ntor_tok); const int ed_cert_token_pos = smartlist_pos(tokens, ed_cert_tok); if (ed_cert_token_pos == -1 || router_token_pos == -1 || (ed_cert_token_pos != router_token_pos + 1 && ed_cert_token_pos != router_token_pos - 1)) { log_warn(LD_DIR, "Ed25519 certificate in wrong position"); goto err; } if (ed_sig_tok != smartlist_get(tokens, smartlist_len(tokens)-2)) { log_warn(LD_DIR, "Ed25519 signature in wrong position"); goto err; } if (strcmp(ed_cert_tok->object_type, "ED25519 CERT")) { log_warn(LD_DIR, "Wrong object type on identity-ed25519 in decriptor"); goto err; } if (strcmp(cc_ntor_tok->object_type, "ED25519 CERT")) { log_warn(LD_DIR, "Wrong object type on ntor-onion-key-crosscert " "in decriptor"); goto err; } if (strcmp(cc_tap_tok->object_type, "CROSSCERT")) { log_warn(LD_DIR, "Wrong object type on onion-key-crosscert " "in decriptor"); goto err; } if (strcmp(cc_ntor_tok->args[0], "0") && strcmp(cc_ntor_tok->args[0], "1")) { log_warn(LD_DIR, "Bad sign bit on ntor-onion-key-crosscert"); goto err; } int ntor_cc_sign_bit = !strcmp(cc_ntor_tok->args[0], "1"); uint8_t d256[DIGEST256_LEN]; const char *signed_start, *signed_end; tor_cert_t *cert = tor_cert_parse( (const uint8_t*)ed_cert_tok->object_body, ed_cert_tok->object_size); if (! cert) { log_warn(LD_DIR, "Couldn't parse ed25519 cert"); goto err; } /* makes sure it gets freed. */ router->cache_info.signing_key_cert = cert; if (cert->cert_type != CERT_TYPE_ID_SIGNING || ! cert->signing_key_included) { log_warn(LD_DIR, "Invalid form for ed25519 cert"); goto err; } if (master_key_tok) { /* This token is optional, but if it's present, it must match * the signature in the signing cert, or supplant it. */ tor_assert(master_key_tok->n_args >= 1); ed25519_public_key_t pkey; if (ed25519_public_from_base64(&pkey, master_key_tok->args[0])<0) { log_warn(LD_DIR, "Can't parse ed25519 master key"); goto err; } if (fast_memneq(&cert->signing_key.pubkey, pkey.pubkey, ED25519_PUBKEY_LEN)) { log_warn(LD_DIR, "Ed25519 master key does not match " "key in certificate"); goto err; } } ntor_cc_cert = tor_cert_parse((const uint8_t*)cc_ntor_tok->object_body, cc_ntor_tok->object_size); if (!ntor_cc_cert) { log_warn(LD_DIR, "Couldn't parse ntor-onion-key-crosscert cert"); goto err; } if (ntor_cc_cert->cert_type != CERT_TYPE_ONION_ID || ! ed25519_pubkey_eq(&ntor_cc_cert->signed_key, &cert->signing_key)) { log_warn(LD_DIR, "Invalid contents for ntor-onion-key-crosscert cert"); goto err; } ed25519_public_key_t ntor_cc_pk; if (ed25519_public_key_from_curve25519_public_key(&ntor_cc_pk, router->onion_curve25519_pkey, ntor_cc_sign_bit)<0) { log_warn(LD_DIR, "Error converting onion key to ed25519"); goto err; } if (router_get_hash_impl_helper(s, end-s, "router ", "\nrouter-sig-ed25519", ' ', LOG_WARN, &signed_start, &signed_end) < 0) { log_warn(LD_DIR, "Can't find ed25519-signed portion of descriptor"); goto err; } crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); crypto_digest_add_bytes(d, ED_DESC_SIGNATURE_PREFIX, strlen(ED_DESC_SIGNATURE_PREFIX)); crypto_digest_add_bytes(d, signed_start, signed_end-signed_start); crypto_digest_get_digest(d, (char*)d256, sizeof(d256)); crypto_digest_free(d); ed25519_checkable_t check[3]; int check_ok[3]; time_t expires = TIME_MAX; if (tor_cert_get_checkable_sig(&check[0], cert, NULL, &expires) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for cert."); goto err; } if (tor_cert_get_checkable_sig(&check[1], ntor_cc_cert, &ntor_cc_pk, &expires) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for ntor_cc_cert."); goto err; } if (ed25519_signature_from_base64(&check[2].signature, ed_sig_tok->args[0])<0) { log_warn(LD_DIR, "Couldn't decode ed25519 signature"); goto err; } check[2].pubkey = &cert->signed_key; check[2].msg = d256; check[2].len = DIGEST256_LEN; if (ed25519_checksig_batch(check_ok, check, 3) < 0) { log_warn(LD_DIR, "Incorrect ed25519 signature(s)"); goto err; } rsa_pubkey = router_get_rsa_onion_pkey(router->onion_pkey, router->onion_pkey_len); if (check_tap_onion_key_crosscert( (const uint8_t*)cc_tap_tok->object_body, (int)cc_tap_tok->object_size, rsa_pubkey, &cert->signing_key, (const uint8_t*)router->cache_info.identity_digest)<0) { log_warn(LD_DIR, "Incorrect TAP cross-verification"); goto err; } /* We check this before adding it to the routerlist. */ router->cert_expiration_time = expires; } } if ((tok = find_opt_by_keyword(tokens, K_FINGERPRINT))) { /* If there's a fingerprint line, it must match the identity digest. */ char d[DIGEST_LEN]; tor_assert(tok->n_args == 1); tor_strstrip(tok->args[0], " "); if (base16_decode(d, DIGEST_LEN, tok->args[0], strlen(tok->args[0])) != DIGEST_LEN) { log_warn(LD_DIR, "Couldn't decode router fingerprint %s", escaped(tok->args[0])); goto err; } 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; } } { const char *version = NULL, *protocols = NULL; if ((tok = find_opt_by_keyword(tokens, K_PLATFORM))) { router->platform = tor_strdup(tok->args[0]); version = tok->args[0]; } if ((tok = find_opt_by_keyword(tokens, K_PROTO))) { router->protocol_list = tor_strdup(tok->args[0]); protocols = tok->args[0]; } summarize_protover_flags(&router->pv, protocols, version); } if ((tok = find_opt_by_keyword(tokens, K_CONTACT))) { router->contact_info = tor_strdup(tok->args[0]); } if (find_opt_by_keyword(tokens, K_REJECT6) || find_opt_by_keyword(tokens, K_ACCEPT6)) { log_warn(LD_DIR, "Rejecting router with reject6/accept6 line: they crash " "older Tors."); goto err; } { smartlist_t *or_addresses = find_all_by_keyword(tokens, K_OR_ADDRESS); if (or_addresses) { find_single_ipv6_orport(or_addresses, &router->ipv6_addr, &router->ipv6_orport); smartlist_free(or_addresses); } } exit_policy_tokens = find_all_exitpolicy(tokens); if (!smartlist_len(exit_policy_tokens)) { log_warn(LD_DIR, "No exit policy tokens in descriptor."); goto err; } SMARTLIST_FOREACH(exit_policy_tokens, directory_token_t *, t, if (router_add_exit_policy(router,t)<0) { log_warn(LD_DIR,"Error in exit policy"); goto err; }); policy_expand_private(&router->exit_policy); if ((tok = find_opt_by_keyword(tokens, K_IPV6_POLICY)) && tok->n_args) { router->ipv6_exit_policy = parse_short_policy(tok->args[0]); if (! router->ipv6_exit_policy) { log_warn(LD_DIR , "Error in ipv6-policy %s", escaped(tok->args[0])); goto err; } } if (policy_is_reject_star(router->exit_policy, AF_INET, 1) && (!router->ipv6_exit_policy || short_policy_is_reject_star(router->ipv6_exit_policy))) router->policy_is_reject_star = 1; if ((tok = find_opt_by_keyword(tokens, K_FAMILY)) && tok->n_args) { int i; router->declared_family = smartlist_new(); for (i=0;in_args;++i) { if (!is_legal_nickname_or_hexdigest(tok->args[i])) { log_warn(LD_DIR, "Illegal nickname %s in family line", escaped(tok->args[i])); goto err; } smartlist_add_strdup(router->declared_family, tok->args[i]); } } if (find_opt_by_keyword(tokens, K_CACHES_EXTRA_INFO)) router->caches_extra_info = 1; if (find_opt_by_keyword(tokens, K_ALLOW_SINGLE_HOP_EXITS)) router->allow_single_hop_exits = 1; if ((tok = find_opt_by_keyword(tokens, K_EXTRA_INFO_DIGEST))) { tor_assert(tok->n_args >= 1); if (strlen(tok->args[0]) == HEX_DIGEST_LEN) { if (base16_decode(router->cache_info.extra_info_digest, DIGEST_LEN, tok->args[0], HEX_DIGEST_LEN) != DIGEST_LEN) { log_warn(LD_DIR,"Invalid extra info digest"); } } else { log_warn(LD_DIR, "Invalid extra info digest %s", escaped(tok->args[0])); } if (tok->n_args >= 2) { if (digest256_from_base64(router->cache_info.extra_info_digest256, tok->args[1]) < 0) { log_warn(LD_DIR, "Invalid extra info digest256 %s", escaped(tok->args[1])); } } } if (find_opt_by_keyword(tokens, K_HIDDEN_SERVICE_DIR)) { router->wants_to_be_hs_dir = 1; } /* This router accepts tunnelled directory requests via begindir if it has * an open dirport or it included "tunnelled-dir-server". */ if (find_opt_by_keyword(tokens, K_DIR_TUNNELLED) || router->dir_port > 0) { router->supports_tunnelled_dir_requests = 1; } tok = find_by_keyword(tokens, K_ROUTER_SIGNATURE); #ifdef COUNT_DISTINCT_DIGESTS if (!verified_digests) verified_digests = digestmap_new(); digestmap_set(verified_digests, signed_digest, (void*)(uintptr_t)1); #endif if (!router->or_port) { log_warn(LD_DIR,"or_port unreadable or 0. Failing."); goto err; } /* We've checked everything that's covered by the hash. */ can_dl_again = 1; if (check_signature_token(digest, DIGEST_LEN, tok, router->identity_pkey, 0, "router descriptor") < 0) goto err; if (!router->platform) { router->platform = tor_strdup(""); } goto done; err: dump_desc(s_dup, "router descriptor"); routerinfo_free(router); router = NULL; done: crypto_pk_free(rsa_pubkey); tor_cert_free(ntor_cc_cert); if (tokens) { SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); smartlist_free(tokens); } smartlist_free(exit_policy_tokens); if (area) { DUMP_AREA(area, "routerinfo"); memarea_drop_all(area); } if (can_dl_again_out) *can_dl_again_out = can_dl_again; return router; } /** Parse a single extrainfo entry from the string s, ending at * end. (If end is NULL, parse up to the end of s.) If * cache_copy is true, make a copy of the extra-info document in the * cache_info fields of the result. If routermap is provided, use it * as a map from router identity to routerinfo_t when looking up signing keys. * * If can_dl_again_out is provided, set *can_dl_again_out to 1 * if it's okay to try to download an extrainfo with this same digest again, * and 0 if it isn't. (It might not be okay to download it again if part of * the part covered by the digest is invalid.) */ extrainfo_t * extrainfo_parse_entry_from_string(const char *s, const char *end, int cache_copy, struct digest_ri_map_t *routermap, int *can_dl_again_out) { extrainfo_t *extrainfo = NULL; char digest[128]; smartlist_t *tokens = NULL; directory_token_t *tok; crypto_pk_t *key = NULL; routerinfo_t *router = NULL; memarea_t *area = NULL; const char *s_dup = s; /* Do not set this to '1' until we have parsed everything that we intend to * parse that's covered by the hash. */ int can_dl_again = 0; if (BUG(s == NULL)) return NULL; if (!end) { end = s + strlen(s); } /* point 'end' to a point immediately after the final newline. */ while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n') --end; if (router_get_extrainfo_hash(s, end-s, digest) < 0) { log_warn(LD_DIR, "Couldn't compute router hash."); goto err; } tokens = smartlist_new(); area = memarea_new(); if (tokenize_string(area,s,end,tokens,extrainfo_token_table,0)) { log_warn(LD_DIR, "Error tokenizing extra-info document."); goto err; } if (smartlist_len(tokens) < 2) { log_warn(LD_DIR, "Impossibly short extra-info document."); goto err; } /* XXXX Accept this in position 1 too, and ed identity in position 0. */ tok = smartlist_get(tokens,0); if (tok->tp != K_EXTRA_INFO) { log_warn(LD_DIR,"Entry does not start with \"extra-info\""); goto err; } extrainfo = tor_malloc_zero(sizeof(extrainfo_t)); extrainfo->cache_info.is_extrainfo = 1; if (cache_copy) extrainfo->cache_info.signed_descriptor_body = tor_memdup_nulterm(s,end-s); extrainfo->cache_info.signed_descriptor_len = end-s; memcpy(extrainfo->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); crypto_digest256((char*)extrainfo->digest256, s, end-s, DIGEST_SHA256); tor_assert(tok->n_args >= 2); if (!is_legal_nickname(tok->args[0])) { log_warn(LD_DIR,"Bad nickname %s on \"extra-info\"",escaped(tok->args[0])); goto err; } strlcpy(extrainfo->nickname, tok->args[0], sizeof(extrainfo->nickname)); if (strlen(tok->args[1]) != HEX_DIGEST_LEN || base16_decode(extrainfo->cache_info.identity_digest, DIGEST_LEN, tok->args[1], HEX_DIGEST_LEN) != DIGEST_LEN) { log_warn(LD_DIR,"Invalid fingerprint %s on \"extra-info\"", escaped(tok->args[1])); goto err; } tok = find_by_keyword(tokens, K_PUBLISHED); if (parse_iso_time(tok->args[0], &extrainfo->cache_info.published_on)) { log_warn(LD_DIR,"Invalid published time %s on \"extra-info\"", escaped(tok->args[0])); goto err; } { directory_token_t *ed_sig_tok, *ed_cert_tok; ed_sig_tok = find_opt_by_keyword(tokens, K_ROUTER_SIG_ED25519); ed_cert_tok = find_opt_by_keyword(tokens, K_IDENTITY_ED25519); int n_ed_toks = !!ed_sig_tok + !!ed_cert_tok; if (n_ed_toks != 0 && n_ed_toks != 2) { log_warn(LD_DIR, "Router descriptor with only partial ed25519/" "cross-certification support"); goto err; } if (ed_sig_tok) { tor_assert(ed_cert_tok); const int ed_cert_token_pos = smartlist_pos(tokens, ed_cert_tok); if (ed_cert_token_pos != 1) { /* Accept this in position 0 XXXX */ log_warn(LD_DIR, "Ed25519 certificate in wrong position"); goto err; } if (ed_sig_tok != smartlist_get(tokens, smartlist_len(tokens)-2)) { log_warn(LD_DIR, "Ed25519 signature in wrong position"); goto err; } if (strcmp(ed_cert_tok->object_type, "ED25519 CERT")) { log_warn(LD_DIR, "Wrong object type on identity-ed25519 in decriptor"); goto err; } uint8_t d256[DIGEST256_LEN]; const char *signed_start, *signed_end; tor_cert_t *cert = tor_cert_parse( (const uint8_t*)ed_cert_tok->object_body, ed_cert_tok->object_size); if (! cert) { log_warn(LD_DIR, "Couldn't parse ed25519 cert"); goto err; } /* makes sure it gets freed. */ extrainfo->cache_info.signing_key_cert = cert; if (cert->cert_type != CERT_TYPE_ID_SIGNING || ! cert->signing_key_included) { log_warn(LD_DIR, "Invalid form for ed25519 cert"); goto err; } if (router_get_hash_impl_helper(s, end-s, "extra-info ", "\nrouter-sig-ed25519", ' ', LOG_WARN, &signed_start, &signed_end) < 0) { log_warn(LD_DIR, "Can't find ed25519-signed portion of extrainfo"); goto err; } crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); crypto_digest_add_bytes(d, ED_DESC_SIGNATURE_PREFIX, strlen(ED_DESC_SIGNATURE_PREFIX)); crypto_digest_add_bytes(d, signed_start, signed_end-signed_start); crypto_digest_get_digest(d, (char*)d256, sizeof(d256)); crypto_digest_free(d); ed25519_checkable_t check[2]; int check_ok[2]; if (tor_cert_get_checkable_sig(&check[0], cert, NULL, NULL) < 0) { log_err(LD_BUG, "Couldn't create 'checkable' for cert."); goto err; } if (ed25519_signature_from_base64(&check[1].signature, ed_sig_tok->args[0])<0) { log_warn(LD_DIR, "Couldn't decode ed25519 signature"); goto err; } check[1].pubkey = &cert->signed_key; check[1].msg = d256; check[1].len = DIGEST256_LEN; if (ed25519_checksig_batch(check_ok, check, 2) < 0) { log_warn(LD_DIR, "Incorrect ed25519 signature(s)"); goto err; } /* We don't check the certificate expiration time: checking that it * matches the cert in the router descriptor is adequate. */ } } /* We've checked everything that's covered by the hash. */ can_dl_again = 1; if (routermap && (router = digestmap_get((digestmap_t*)routermap, extrainfo->cache_info.identity_digest))) { key = router->identity_pkey; } tok = find_by_keyword(tokens, K_ROUTER_SIGNATURE); if (strcmp(tok->object_type, "SIGNATURE") || tok->object_size < 128 || tok->object_size > 512) { log_warn(LD_DIR, "Bad object type or length on extra-info signature"); goto err; } if (key) { if (check_signature_token(digest, DIGEST_LEN, tok, key, 0, "extra-info") < 0) goto err; if (router) extrainfo->cache_info.send_unencrypted = router->cache_info.send_unencrypted; } else { extrainfo->pending_sig = tor_memdup(tok->object_body, tok->object_size); extrainfo->pending_sig_len = tok->object_size; } goto done; err: dump_desc(s_dup, "extra-info descriptor"); extrainfo_free(extrainfo); extrainfo = NULL; done: if (tokens) { SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); smartlist_free(tokens); } if (area) { DUMP_AREA(area, "extrainfo"); memarea_drop_all(area); } if (can_dl_again_out) *can_dl_again_out = can_dl_again; return extrainfo; } /** Helper: given a string s, return the start of the next router-status * object (starting with "r " at the start of a line). If none is found, * return the start of the directory footer, or the next directory signature. * If none is found, return the end of the string. */ static inline const char * find_start_of_next_routerstatus(const char *s) { const char *eos, *footer, *sig; if ((eos = strstr(s, "\nr "))) ++eos; else eos = s + strlen(s); footer = tor_memstr(s, eos-s, "\ndirectory-footer"); sig = tor_memstr(s, eos-s, "\ndirectory-signature"); if (footer && sig) return MIN(footer, sig) + 1; else if (footer) return footer+1; else if (sig) return sig+1; else return eos; } /** Parse the GuardFraction string from a consensus or vote. * * If vote or vote_rs are set the document getting * parsed is a vote routerstatus. Otherwise it's a consensus. This is * the same semantic as in routerstatus_parse_entry_from_string(). */ STATIC int routerstatus_parse_guardfraction(const char *guardfraction_str, networkstatus_t *vote, vote_routerstatus_t *vote_rs, routerstatus_t *rs) { int ok; const char *end_of_header = NULL; int is_consensus = !vote_rs; uint32_t guardfraction; tor_assert(bool_eq(vote, vote_rs)); /* If this info comes from a consensus, but we should't apply guardfraction, just exit. */ if (is_consensus && !should_apply_guardfraction(NULL)) { return 0; } end_of_header = strchr(guardfraction_str, '='); if (!end_of_header) { return -1; } guardfraction = (uint32_t)tor_parse_ulong(end_of_header+1, 10, 0, 100, &ok, NULL); if (!ok) { log_warn(LD_DIR, "Invalid GuardFraction %s", escaped(guardfraction_str)); return -1; } log_debug(LD_GENERAL, "[*] Parsed %s guardfraction '%s' for '%s'.", is_consensus ? "consensus" : "vote", guardfraction_str, rs->nickname); if (!is_consensus) { /* We are parsing a vote */ vote_rs->status.guardfraction_percentage = guardfraction; vote_rs->status.has_guardfraction = 1; } else { /* We are parsing a consensus. Only apply guardfraction to guards. */ if (rs->is_possible_guard) { rs->guardfraction_percentage = guardfraction; rs->has_guardfraction = 1; } else { log_warn(LD_BUG, "Got GuardFraction for non-guard %s. " "This is not supposed to happen. Not applying. ", rs->nickname); } } return 0; } /** Summarize the protocols listed in protocols into out, * falling back or correcting them based on version as appropriate. */ STATIC void summarize_protover_flags(protover_summary_flags_t *out, const char *protocols, const char *version) { tor_assert(out); memset(out, 0, sizeof(*out)); if (protocols) { out->protocols_known = 1; out->supports_extend2_cells = protocol_list_supports_protocol(protocols, PRT_RELAY, 2); out->supports_ed25519_link_handshake_compat = protocol_list_supports_protocol(protocols, PRT_LINKAUTH, 3); out->supports_ed25519_link_handshake_any = protocol_list_supports_protocol_or_later(protocols, PRT_LINKAUTH, 3); out->supports_ed25519_hs_intro = protocol_list_supports_protocol(protocols, PRT_HSINTRO, 4); out->supports_v3_hsdir = protocol_list_supports_protocol(protocols, PRT_HSDIR, PROTOVER_HSDIR_V3); out->supports_v3_rendezvous_point = protocol_list_supports_protocol(protocols, PRT_HSREND, PROTOVER_HS_RENDEZVOUS_POINT_V3); } if (version && !strcmpstart(version, "Tor ")) { if (!out->protocols_known) { /* The version is a "Tor" version, and where there is no * list of protocol versions that we should be looking at instead. */ out->supports_extend2_cells = tor_version_as_new_as(version, "0.2.4.8-alpha"); out->protocols_known = 1; } else { /* Bug #22447 forces us to filter on this version. */ if (!tor_version_as_new_as(version, "0.3.0.8")) { out->supports_v3_hsdir = 0; } } } } /** Given a string at *s, containing a routerstatus object, and an * empty smartlist at tokens, parse and return the first router status * object in the string, and advance *s to just after the end of the * router status. Return NULL and advance *s on error. * * If vote and vote_rs are provided, don't allocate a fresh * routerstatus but use vote_rs instead. * * If consensus_method is nonzero, this routerstatus is part of a * consensus, and we should parse it according to the method used to * make that consensus. * * Parse according to the syntax used by the consensus flavor flav. **/ STATIC routerstatus_t * routerstatus_parse_entry_from_string(memarea_t *area, const char **s, smartlist_t *tokens, networkstatus_t *vote, vote_routerstatus_t *vote_rs, int consensus_method, consensus_flavor_t flav) { const char *eos, *s_dup = *s; routerstatus_t *rs = NULL; directory_token_t *tok; char timebuf[ISO_TIME_LEN+1]; struct in_addr in; int offset = 0; tor_assert(tokens); tor_assert(bool_eq(vote, vote_rs)); if (!consensus_method) flav = FLAV_NS; tor_assert(flav == FLAV_NS || flav == FLAV_MICRODESC); eos = find_start_of_next_routerstatus(*s); if (tokenize_string(area,*s, eos, tokens, rtrstatus_token_table,0)) { log_warn(LD_DIR, "Error tokenizing router status"); goto err; } if (smartlist_len(tokens) < 1) { log_warn(LD_DIR, "Impossibly short router status"); goto err; } tok = find_by_keyword(tokens, K_R); tor_assert(tok->n_args >= 7); /* guaranteed by GE(7) in K_R setup */ if (flav == FLAV_NS) { if (tok->n_args < 8) { log_warn(LD_DIR, "Too few arguments to r"); goto err; } } else if (flav == FLAV_MICRODESC) { offset = -1; /* There is no descriptor digest in an md consensus r line */ } if (vote_rs) { rs = &vote_rs->status; } else { rs = tor_malloc_zero(sizeof(routerstatus_t)); } if (!is_legal_nickname(tok->args[0])) { log_warn(LD_DIR, "Invalid nickname %s in router status; skipping.", escaped(tok->args[0])); goto err; } strlcpy(rs->nickname, tok->args[0], sizeof(rs->nickname)); if (digest_from_base64(rs->identity_digest, tok->args[1])) { log_warn(LD_DIR, "Error decoding identity digest %s", escaped(tok->args[1])); goto err; } if (flav == FLAV_NS) { if (digest_from_base64(rs->descriptor_digest, tok->args[2])) { log_warn(LD_DIR, "Error decoding descriptor digest %s", escaped(tok->args[2])); goto err; } } if (tor_snprintf(timebuf, sizeof(timebuf), "%s %s", tok->args[3+offset], tok->args[4+offset]) < 0 || parse_iso_time(timebuf, &rs->published_on)<0) { log_warn(LD_DIR, "Error parsing time '%s %s' [%d %d]", tok->args[3+offset], tok->args[4+offset], offset, (int)flav); goto err; } if (tor_inet_aton(tok->args[5+offset], &in) == 0) { log_warn(LD_DIR, "Error parsing router address in network-status %s", escaped(tok->args[5+offset])); goto err; } rs->addr = ntohl(in.s_addr); rs->or_port = (uint16_t) tor_parse_long(tok->args[6+offset], 10,0,65535,NULL,NULL); rs->dir_port = (uint16_t) tor_parse_long(tok->args[7+offset], 10,0,65535,NULL,NULL); { smartlist_t *a_lines = find_all_by_keyword(tokens, K_A); if (a_lines) { find_single_ipv6_orport(a_lines, &rs->ipv6_addr, &rs->ipv6_orport); smartlist_free(a_lines); } } tok = find_opt_by_keyword(tokens, K_S); if (tok && vote) { int i; vote_rs->flags = 0; for (i=0; i < tok->n_args; ++i) { int p = smartlist_string_pos(vote->known_flags, tok->args[i]); if (p >= 0) { vote_rs->flags |= (UINT64_C(1)<args[i])); goto err; } } } else if (tok) { /* This is a consensus, not a vote. */ int i; for (i=0; i < tok->n_args; ++i) { if (!strcmp(tok->args[i], "Exit")) rs->is_exit = 1; else if (!strcmp(tok->args[i], "Stable")) rs->is_stable = 1; else if (!strcmp(tok->args[i], "Fast")) rs->is_fast = 1; else if (!strcmp(tok->args[i], "Running")) rs->is_flagged_running = 1; else if (!strcmp(tok->args[i], "Named")) rs->is_named = 1; else if (!strcmp(tok->args[i], "Valid")) rs->is_valid = 1; else if (!strcmp(tok->args[i], "Guard")) rs->is_possible_guard = 1; else if (!strcmp(tok->args[i], "BadExit")) rs->is_bad_exit = 1; else if (!strcmp(tok->args[i], "Authority")) rs->is_authority = 1; else if (!strcmp(tok->args[i], "Unnamed") && consensus_method >= 2) { /* Unnamed is computed right by consensus method 2 and later. */ rs->is_unnamed = 1; } else if (!strcmp(tok->args[i], "HSDir")) { rs->is_hs_dir = 1; } else if (!strcmp(tok->args[i], "V2Dir")) { rs->is_v2_dir = 1; } } /* These are implied true by having been included in a consensus made * with a given method */ rs->is_flagged_running = 1; /* Starting with consensus method 4. */ rs->is_valid = 1; /* Starting with consensus method 24. */ } { const char *protocols = NULL, *version = NULL; if ((tok = find_opt_by_keyword(tokens, K_PROTO))) { tor_assert(tok->n_args == 1); protocols = tok->args[0]; } if ((tok = find_opt_by_keyword(tokens, K_V))) { tor_assert(tok->n_args == 1); version = tok->args[0]; if (vote_rs) { vote_rs->version = tor_strdup(tok->args[0]); } } summarize_protover_flags(&rs->pv, protocols, version); } /* handle weighting/bandwidth info */ if ((tok = find_opt_by_keyword(tokens, K_W))) { int i; for (i=0; i < tok->n_args; ++i) { if (!strcmpstart(tok->args[i], "Bandwidth=")) { int ok; rs->bandwidth_kb = (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, 10, 0, UINT32_MAX, &ok, NULL); if (!ok) { log_warn(LD_DIR, "Invalid Bandwidth %s", escaped(tok->args[i])); goto err; } rs->has_bandwidth = 1; } else if (!strcmpstart(tok->args[i], "Measured=") && vote_rs) { int ok; vote_rs->measured_bw_kb = (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, 10, 0, UINT32_MAX, &ok, NULL); if (!ok) { log_warn(LD_DIR, "Invalid Measured Bandwidth %s", escaped(tok->args[i])); goto err; } vote_rs->has_measured_bw = 1; vote->has_measured_bws = 1; } else if (!strcmpstart(tok->args[i], "Unmeasured=1")) { rs->bw_is_unmeasured = 1; } else if (!strcmpstart(tok->args[i], "GuardFraction=")) { if (routerstatus_parse_guardfraction(tok->args[i], vote, vote_rs, rs) < 0) { goto err; } } } } /* parse exit policy summaries */ if ((tok = find_opt_by_keyword(tokens, K_P))) { tor_assert(tok->n_args == 1); if (strcmpstart(tok->args[0], "accept ") && strcmpstart(tok->args[0], "reject ")) { log_warn(LD_DIR, "Unknown exit policy summary type %s.", escaped(tok->args[0])); goto err; } /* XXX weasel: parse this into ports and represent them somehow smart, * maybe not here but somewhere on if we need it for the client. * we should still parse it here to check it's valid tho. */ rs->exitsummary = tor_strdup(tok->args[0]); rs->has_exitsummary = 1; } if (vote_rs) { SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, t) { if (t->tp == K_M && t->n_args) { vote_microdesc_hash_t *line = tor_malloc(sizeof(vote_microdesc_hash_t)); line->next = vote_rs->microdesc; line->microdesc_hash_line = tor_strdup(t->args[0]); vote_rs->microdesc = line; } if (t->tp == K_ID) { tor_assert(t->n_args >= 2); if (!strcmp(t->args[0], "ed25519")) { vote_rs->has_ed25519_listing = 1; if (strcmp(t->args[1], "none") && digest256_from_base64((char*)vote_rs->ed25519_id, t->args[1])<0) { log_warn(LD_DIR, "Bogus ed25519 key in networkstatus vote"); goto err; } } } if (t->tp == K_PROTO) { tor_assert(t->n_args == 1); vote_rs->protocols = tor_strdup(t->args[0]); } } SMARTLIST_FOREACH_END(t); } else if (flav == FLAV_MICRODESC) { tok = find_opt_by_keyword(tokens, K_M); if (tok) { tor_assert(tok->n_args); if (digest256_from_base64(rs->descriptor_digest, tok->args[0])) { log_warn(LD_DIR, "Error decoding microdescriptor digest %s", escaped(tok->args[0])); goto err; } } else { log_info(LD_BUG, "Found an entry in networkstatus with no " "microdescriptor digest. (Router %s ($%s) at %s:%d.)", rs->nickname, hex_str(rs->identity_digest, DIGEST_LEN), fmt_addr32(rs->addr), rs->or_port); } } if (!strcasecmp(rs->nickname, UNNAMED_ROUTER_NICKNAME)) rs->is_named = 0; goto done; err: dump_desc(s_dup, "routerstatus entry"); if (rs && !vote_rs) routerstatus_free(rs); rs = NULL; done: SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); smartlist_clear(tokens); if (area) { DUMP_AREA(area, "routerstatus entry"); memarea_clear(area); } *s = eos; return rs; } int compare_vote_routerstatus_entries(const void **_a, const void **_b) { const vote_routerstatus_t *a = *_a, *b = *_b; return fast_memcmp(a->status.identity_digest, b->status.identity_digest, DIGEST_LEN); } /** Verify the bandwidth weights of a network status document */ int networkstatus_verify_bw_weights(networkstatus_t *ns, int consensus_method) { int64_t G=0, M=0, E=0, D=0, T=0; double Wgg, Wgm, Wgd, Wmg, Wmm, Wme, Wmd, Weg, Wem, Wee, Wed; double Gtotal=0, Mtotal=0, Etotal=0; const char *casename = NULL; int valid = 1; (void) consensus_method; const int64_t weight_scale = networkstatus_get_weight_scale_param(ns); tor_assert(weight_scale >= 1); Wgg = networkstatus_get_bw_weight(ns, "Wgg", -1); Wgm = networkstatus_get_bw_weight(ns, "Wgm", -1); Wgd = networkstatus_get_bw_weight(ns, "Wgd", -1); Wmg = networkstatus_get_bw_weight(ns, "Wmg", -1); Wmm = networkstatus_get_bw_weight(ns, "Wmm", -1); Wme = networkstatus_get_bw_weight(ns, "Wme", -1); Wmd = networkstatus_get_bw_weight(ns, "Wmd", -1); Weg = networkstatus_get_bw_weight(ns, "Weg", -1); Wem = networkstatus_get_bw_weight(ns, "Wem", -1); Wee = networkstatus_get_bw_weight(ns, "Wee", -1); Wed = networkstatus_get_bw_weight(ns, "Wed", -1); if (Wgg<0 || Wgm<0 || Wgd<0 || Wmg<0 || Wmm<0 || Wme<0 || Wmd<0 || Weg<0 || Wem<0 || Wee<0 || Wed<0) { log_warn(LD_BUG, "No bandwidth weights produced in consensus!"); return 0; } // First, sanity check basic summing properties that hold for all cases // We use > 1 as the check for these because they are computed as integers. // Sometimes there are rounding errors. if (fabs(Wmm - weight_scale) > 1) { log_warn(LD_BUG, "Wmm=%f != %"PRId64, Wmm, (weight_scale)); valid = 0; } if (fabs(Wem - Wee) > 1) { log_warn(LD_BUG, "Wem=%f != Wee=%f", Wem, Wee); valid = 0; } if (fabs(Wgm - Wgg) > 1) { log_warn(LD_BUG, "Wgm=%f != Wgg=%f", Wgm, Wgg); valid = 0; } if (fabs(Weg - Wed) > 1) { log_warn(LD_BUG, "Wed=%f != Weg=%f", Wed, Weg); valid = 0; } if (fabs(Wgg + Wmg - weight_scale) > 0.001*weight_scale) { log_warn(LD_BUG, "Wgg=%f != %"PRId64" - Wmg=%f", Wgg, (weight_scale), Wmg); valid = 0; } if (fabs(Wee + Wme - weight_scale) > 0.001*weight_scale) { log_warn(LD_BUG, "Wee=%f != %"PRId64" - Wme=%f", Wee, (weight_scale), Wme); valid = 0; } if (fabs(Wgd + Wmd + Wed - weight_scale) > 0.001*weight_scale) { log_warn(LD_BUG, "Wgd=%f + Wmd=%f + Wed=%f != %"PRId64, Wgd, Wmd, Wed, (weight_scale)); valid = 0; } Wgg /= weight_scale; Wgm /= weight_scale; (void) Wgm; // unused from here on. Wgd /= weight_scale; Wmg /= weight_scale; Wmm /= weight_scale; Wme /= weight_scale; Wmd /= weight_scale; Weg /= weight_scale; (void) Weg; // unused from here on. Wem /= weight_scale; (void) Wem; // unused from here on. Wee /= weight_scale; Wed /= weight_scale; // Then, gather G, M, E, D, T to determine case SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) { int is_exit = 0; /* Bug #2203: Don't count bad exits as exits for balancing */ is_exit = rs->is_exit && !rs->is_bad_exit; if (rs->has_bandwidth) { T += rs->bandwidth_kb; if (is_exit && rs->is_possible_guard) { D += rs->bandwidth_kb; Gtotal += Wgd*rs->bandwidth_kb; Mtotal += Wmd*rs->bandwidth_kb; Etotal += Wed*rs->bandwidth_kb; } else if (is_exit) { E += rs->bandwidth_kb; Mtotal += Wme*rs->bandwidth_kb; Etotal += Wee*rs->bandwidth_kb; } else if (rs->is_possible_guard) { G += rs->bandwidth_kb; Gtotal += Wgg*rs->bandwidth_kb; Mtotal += Wmg*rs->bandwidth_kb; } else { M += rs->bandwidth_kb; Mtotal += Wmm*rs->bandwidth_kb; } } else { log_warn(LD_BUG, "Missing consensus bandwidth for router %s", routerstatus_describe(rs)); } } SMARTLIST_FOREACH_END(rs); // Finally, check equality conditions depending upon case 1, 2 or 3 // Full equality cases: 1, 3b // Partial equality cases: 2b (E=G), 3a (M=E) // Fully unknown: 2a if (3*E >= T && 3*G >= T) { // Case 1: Neither are scarce casename = "Case 1"; if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Mtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Mtotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } else if (3*E < T && 3*G < T) { int64_t R = MIN(E, G); int64_t S = MAX(E, G); /* * Case 2: Both Guards and Exits are scarce * Balance D between E and G, depending upon * D capacity and scarcity. Devote no extra * bandwidth to middle nodes. */ if (R+D < S) { // Subcase a double Rtotal, Stotal; if (E < G) { Rtotal = Etotal; Stotal = Gtotal; } else { Rtotal = Gtotal; Stotal = Etotal; } casename = "Case 2a"; // Rtotal < Stotal if (Rtotal > Stotal) { log_warn(LD_DIR, "Bw Weight Failure for %s: Rtotal %f > Stotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Rtotal, Stotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } // Rtotal < T/3 if (3*Rtotal > T) { log_warn(LD_DIR, "Bw Weight Failure for %s: 3*Rtotal %f > T " "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 " D=%"PRId64" T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Rtotal*3, (T), (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } // Stotal < T/3 if (3*Stotal > T) { log_warn(LD_DIR, "Bw Weight Failure for %s: 3*Stotal %f > T " "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 " D=%"PRId64" T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Stotal*3, (T), (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } // Mtotal > T/3 if (3*Mtotal < T) { log_warn(LD_DIR, "Bw Weight Failure for %s: 3*Mtotal %f < T " "%"PRId64". " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Mtotal*3, (T), (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } else { // Subcase b: R+D > S casename = "Case 2b"; /* Check the rare-M redirect case. */ if (D != 0 && 3*M < T) { casename = "Case 2b (balanced)"; if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Mtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Mtotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } else { if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } } } else { // if (E < T/3 || G < T/3) { int64_t S = MIN(E, G); int64_t NS = MAX(E, G); if (3*(S+D) < T) { // Subcase a: double Stotal; double NStotal; if (G < E) { casename = "Case 3a (G scarce)"; Stotal = Gtotal; NStotal = Etotal; } else { // if (G >= E) { casename = "Case 3a (E scarce)"; NStotal = Gtotal; Stotal = Etotal; } // Stotal < T/3 if (3*Stotal > T) { log_warn(LD_DIR, "Bw Weight Failure for %s: 3*Stotal %f > T " "%"PRId64". G=%"PRId64" M=%"PRId64" E=%"PRId64 " D=%"PRId64" T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Stotal*3, (T), (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (NS >= M) { if (fabs(NStotal-Mtotal) > 0.01*MAX(NStotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: NStotal %f != Mtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, NStotal, Mtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } else { // if NS < M, NStotal > T/3 because only one of G or E is scarce if (3*NStotal < T) { log_warn(LD_DIR, "Bw Weight Failure for %s: 3*NStotal %f < T " "%"PRId64". G=%"PRId64" M=%"PRId64 " E=%"PRId64" D=%"PRId64" T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, NStotal*3, (T), (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } } else { // Subcase b: S+D >= T/3 casename = "Case 3b"; if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Mtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Etotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { log_warn(LD_DIR, "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " "G=%"PRId64" M=%"PRId64" E=%"PRId64" D=%"PRId64 " T=%"PRId64". " "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", casename, Mtotal, Gtotal, (G), (M), (E), (D), (T), Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); valid = 0; } } } if (valid) log_notice(LD_DIR, "Bandwidth-weight %s is verified and valid.", casename); return valid; } /** Check if a shared random value of type srv_type is in * tokens. If there is, parse it and set it to srv_out. Return * -1 on failure, 0 on success. The resulting srv is allocated on the heap and * it's the responsibility of the caller to free it. */ static int extract_one_srv(smartlist_t *tokens, directory_keyword srv_type, sr_srv_t **srv_out) { int ret = -1; directory_token_t *tok; sr_srv_t *srv = NULL; smartlist_t *chunks; tor_assert(tokens); chunks = smartlist_new(); tok = find_opt_by_keyword(tokens, srv_type); if (!tok) { /* That's fine, no SRV is allowed. */ ret = 0; goto end; } for (int i = 0; i < tok->n_args; i++) { smartlist_add(chunks, tok->args[i]); } srv = sr_parse_srv(chunks); if (srv == NULL) { log_warn(LD_DIR, "SR: Unparseable SRV %s", escaped(tok->object_body)); goto end; } /* All is good. */ *srv_out = srv; ret = 0; end: smartlist_free(chunks); return ret; } /** Extract any shared random values found in tokens and place them in * the networkstatus ns. */ static void extract_shared_random_srvs(networkstatus_t *ns, smartlist_t *tokens) { const char *voter_identity; networkstatus_voter_info_t *voter; tor_assert(ns); tor_assert(tokens); /* Can be only one of them else code flow. */ tor_assert(ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS); if (ns->type == NS_TYPE_VOTE) { voter = smartlist_get(ns->voters, 0); tor_assert(voter); voter_identity = hex_str(voter->identity_digest, sizeof(voter->identity_digest)); } else { /* Consensus has multiple voters so no specific voter. */ voter_identity = "consensus"; } /* We extract both, and on error everything is stopped because it means * the vote is malformed for the shared random value(s). */ if (extract_one_srv(tokens, K_PREVIOUS_SRV, &ns->sr_info.previous_srv) < 0) { log_warn(LD_DIR, "SR: Unable to parse previous SRV from %s", voter_identity); /* Maybe we have a chance with the current SRV so let's try it anyway. */ } if (extract_one_srv(tokens, K_CURRENT_SRV, &ns->sr_info.current_srv) < 0) { log_warn(LD_DIR, "SR: Unable to parse current SRV from %s", voter_identity); } } /** Parse a v3 networkstatus vote, opinion, or consensus (depending on * ns_type), from s, and return the result. Return NULL on failure. */ networkstatus_t * networkstatus_parse_vote_from_string(const char *s, const char **eos_out, networkstatus_type_t ns_type) { smartlist_t *tokens = smartlist_new(); smartlist_t *rs_tokens = NULL, *footer_tokens = NULL; networkstatus_voter_info_t *voter = NULL; networkstatus_t *ns = NULL; common_digests_t ns_digests; uint8_t sha3_as_signed[DIGEST256_LEN]; const char *cert, *end_of_header, *end_of_footer, *s_dup = s; directory_token_t *tok; struct in_addr in; int i, inorder, n_signatures = 0; memarea_t *area = NULL, *rs_area = NULL; consensus_flavor_t flav = FLAV_NS; char *last_kwd=NULL; tor_assert(s); if (eos_out) *eos_out = NULL; if (router_get_networkstatus_v3_hashes(s, &ns_digests) || router_get_networkstatus_v3_sha3_as_signed(sha3_as_signed, s)<0) { log_warn(LD_DIR, "Unable to compute digest of network-status"); goto err; } area = memarea_new(); end_of_header = find_start_of_next_routerstatus(s); if (tokenize_string(area, s, end_of_header, tokens, (ns_type == NS_TYPE_CONSENSUS) ? networkstatus_consensus_token_table : networkstatus_token_table, 0)) { log_warn(LD_DIR, "Error tokenizing network-status header"); goto err; } ns = tor_malloc_zero(sizeof(networkstatus_t)); memcpy(&ns->digests, &ns_digests, sizeof(ns_digests)); memcpy(&ns->digest_sha3_as_signed, sha3_as_signed, sizeof(sha3_as_signed)); tok = find_by_keyword(tokens, K_NETWORK_STATUS_VERSION); tor_assert(tok); if (tok->n_args > 1) { int flavor = networkstatus_parse_flavor_name(tok->args[1]); if (flavor < 0) { log_warn(LD_DIR, "Can't parse document with unknown flavor %s", escaped(tok->args[1])); goto err; } ns->flavor = flav = flavor; } if (flav != FLAV_NS && ns_type != NS_TYPE_CONSENSUS) { log_warn(LD_DIR, "Flavor found on non-consensus networkstatus."); goto err; } if (ns_type != NS_TYPE_CONSENSUS) { const char *end_of_cert = NULL; if (!(cert = strstr(s, "\ndir-key-certificate-version"))) goto err; ++cert; ns->cert = authority_cert_parse_from_string(cert, &end_of_cert); if (!ns->cert || !end_of_cert || end_of_cert > end_of_header) goto err; } tok = find_by_keyword(tokens, K_VOTE_STATUS); tor_assert(tok->n_args); if (!strcmp(tok->args[0], "vote")) { ns->type = NS_TYPE_VOTE; } else if (!strcmp(tok->args[0], "consensus")) { ns->type = NS_TYPE_CONSENSUS; } else if (!strcmp(tok->args[0], "opinion")) { ns->type = NS_TYPE_OPINION; } else { log_warn(LD_DIR, "Unrecognized vote status %s in network-status", escaped(tok->args[0])); goto err; } if (ns_type != ns->type) { log_warn(LD_DIR, "Got the wrong kind of v3 networkstatus."); goto err; } if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_OPINION) { tok = find_by_keyword(tokens, K_PUBLISHED); if (parse_iso_time(tok->args[0], &ns->published)) goto err; ns->supported_methods = smartlist_new(); tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHODS); if (tok) { for (i=0; i < tok->n_args; ++i) smartlist_add_strdup(ns->supported_methods, tok->args[i]); } else { smartlist_add_strdup(ns->supported_methods, "1"); } } else { tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHOD); if (tok) { int num_ok; ns->consensus_method = (int)tor_parse_long(tok->args[0], 10, 1, INT_MAX, &num_ok, NULL); if (!num_ok) goto err; } else { ns->consensus_method = 1; } } if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_CLIENT_PROTOCOLS))) ns->recommended_client_protocols = tor_strdup(tok->args[0]); if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_RELAY_PROTOCOLS))) ns->recommended_relay_protocols = tor_strdup(tok->args[0]); if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_CLIENT_PROTOCOLS))) ns->required_client_protocols = tor_strdup(tok->args[0]); if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_RELAY_PROTOCOLS))) ns->required_relay_protocols = tor_strdup(tok->args[0]); tok = find_by_keyword(tokens, K_VALID_AFTER); if (parse_iso_time(tok->args[0], &ns->valid_after)) goto err; tok = find_by_keyword(tokens, K_FRESH_UNTIL); if (parse_iso_time(tok->args[0], &ns->fresh_until)) goto err; tok = find_by_keyword(tokens, K_VALID_UNTIL); if (parse_iso_time(tok->args[0], &ns->valid_until)) goto err; tok = find_by_keyword(tokens, K_VOTING_DELAY); tor_assert(tok->n_args >= 2); { int ok; ns->vote_seconds = (int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &ok, NULL); if (!ok) goto err; ns->dist_seconds = (int) tor_parse_long(tok->args[1], 10, 0, INT_MAX, &ok, NULL); if (!ok) goto err; } if (ns->valid_after + (get_options()->TestingTorNetwork ? MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL) > ns->fresh_until) { log_warn(LD_DIR, "Vote/consensus freshness interval is too short"); goto err; } if (ns->valid_after + (get_options()->TestingTorNetwork ? MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL)*2 > ns->valid_until) { log_warn(LD_DIR, "Vote/consensus liveness interval is too short"); goto err; } if (ns->vote_seconds < MIN_VOTE_SECONDS) { log_warn(LD_DIR, "Vote seconds is too short"); goto err; } if (ns->dist_seconds < MIN_DIST_SECONDS) { log_warn(LD_DIR, "Dist seconds is too short"); goto err; } if ((tok = find_opt_by_keyword(tokens, K_CLIENT_VERSIONS))) { ns->client_versions = tor_strdup(tok->args[0]); } if ((tok = find_opt_by_keyword(tokens, K_SERVER_VERSIONS))) { ns->server_versions = tor_strdup(tok->args[0]); } { smartlist_t *package_lst = find_all_by_keyword(tokens, K_PACKAGE); ns->package_lines = smartlist_new(); if (package_lst) { SMARTLIST_FOREACH(package_lst, directory_token_t *, t, smartlist_add_strdup(ns->package_lines, t->args[0])); } smartlist_free(package_lst); } tok = find_by_keyword(tokens, K_KNOWN_FLAGS); ns->known_flags = smartlist_new(); inorder = 1; for (i = 0; i < tok->n_args; ++i) { smartlist_add_strdup(ns->known_flags, tok->args[i]); if (i>0 && strcmp(tok->args[i-1], tok->args[i])>= 0) { log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); inorder = 0; } } if (!inorder) { log_warn(LD_DIR, "known-flags not in order"); goto err; } if (ns->type != NS_TYPE_CONSENSUS && smartlist_len(ns->known_flags) > MAX_KNOWN_FLAGS_IN_VOTE) { /* If we allowed more than 64 flags in votes, then parsing them would make * us invoke undefined behavior whenever we used 1<net_params = smartlist_new(); for (i = 0; i < tok->n_args; ++i) { int ok=0; char *eq = strchr(tok->args[i], '='); size_t eq_pos; if (!eq) { log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); goto err; } eq_pos = eq-tok->args[i]; tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); if (!ok) { log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); goto err; } if (i > 0 && strcmp(tok->args[i-1], tok->args[i]) >= 0) { log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); inorder = 0; } if (last_kwd && eq_pos == strlen(last_kwd) && fast_memeq(last_kwd, tok->args[i], eq_pos)) { log_warn(LD_DIR, "Duplicate value for %s parameter", escaped(tok->args[i])); any_dups = 1; } tor_free(last_kwd); last_kwd = tor_strndup(tok->args[i], eq_pos); smartlist_add_strdup(ns->net_params, tok->args[i]); } if (!inorder) { log_warn(LD_DIR, "params not in order"); goto err; } if (any_dups) { log_warn(LD_DIR, "Duplicate in parameters"); goto err; } } ns->voters = smartlist_new(); SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { tok = _tok; if (tok->tp == K_DIR_SOURCE) { tor_assert(tok->n_args >= 6); if (voter) smartlist_add(ns->voters, voter); voter = tor_malloc_zero(sizeof(networkstatus_voter_info_t)); voter->sigs = smartlist_new(); if (ns->type != NS_TYPE_CONSENSUS) memcpy(voter->vote_digest, ns_digests.d[DIGEST_SHA1], DIGEST_LEN); voter->nickname = tor_strdup(tok->args[0]); if (strlen(tok->args[1]) != HEX_DIGEST_LEN || base16_decode(voter->identity_digest, sizeof(voter->identity_digest), tok->args[1], HEX_DIGEST_LEN) != sizeof(voter->identity_digest)) { log_warn(LD_DIR, "Error decoding identity digest %s in " "network-status document.", escaped(tok->args[1])); goto err; } if (ns->type != NS_TYPE_CONSENSUS && 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; } if (ns->type != NS_TYPE_CONSENSUS) { if (authority_cert_is_blacklisted(ns->cert)) { log_warn(LD_DIR, "Rejecting vote signature made with blacklisted " "signing key %s", hex_str(ns->cert->signing_key_digest, DIGEST_LEN)); goto err; } } voter->address = tor_strdup(tok->args[2]); if (!tor_inet_aton(tok->args[3], &in)) { log_warn(LD_DIR, "Error decoding IP address %s in network-status.", escaped(tok->args[3])); goto err; } voter->addr = ntohl(in.s_addr); int ok; voter->dir_port = (uint16_t) tor_parse_long(tok->args[4], 10, 0, 65535, &ok, NULL); if (!ok) goto err; voter->or_port = (uint16_t) tor_parse_long(tok->args[5], 10, 0, 65535, &ok, NULL); if (!ok) goto err; } else if (tok->tp == K_CONTACT) { if (!voter || voter->contact) { log_warn(LD_DIR, "contact element is out of place."); goto err; } voter->contact = tor_strdup(tok->args[0]); } else if (tok->tp == K_VOTE_DIGEST) { tor_assert(ns->type == NS_TYPE_CONSENSUS); tor_assert(tok->n_args >= 1); if (!voter || ! tor_digest_is_zero(voter->vote_digest)) { log_warn(LD_DIR, "vote-digest element is out of place."); goto err; } if (strlen(tok->args[0]) != HEX_DIGEST_LEN || base16_decode(voter->vote_digest, sizeof(voter->vote_digest), tok->args[0], HEX_DIGEST_LEN) != sizeof(voter->vote_digest)) { log_warn(LD_DIR, "Error decoding vote digest %s in " "network-status consensus.", escaped(tok->args[0])); goto err; } } } SMARTLIST_FOREACH_END(_tok); if (voter) { smartlist_add(ns->voters, voter); voter = NULL; } if (smartlist_len(ns->voters) == 0) { log_warn(LD_DIR, "Missing dir-source elements in a networkstatus."); goto err; } else if (ns->type != NS_TYPE_CONSENSUS && smartlist_len(ns->voters) != 1) { log_warn(LD_DIR, "Too many dir-source elements in a vote networkstatus."); goto err; } if (ns->type != NS_TYPE_CONSENSUS && (tok = find_opt_by_keyword(tokens, K_LEGACY_DIR_KEY))) { int bad = 1; if (strlen(tok->args[0]) == HEX_DIGEST_LEN) { networkstatus_voter_info_t *voter_0 = smartlist_get(ns->voters, 0); if (base16_decode(voter_0->legacy_id_digest, DIGEST_LEN, tok->args[0], HEX_DIGEST_LEN) != DIGEST_LEN) bad = 1; else bad = 0; } if (bad) { log_warn(LD_DIR, "Invalid legacy key digest %s on vote.", escaped(tok->args[0])); } } /* If this is a vote document, check if information about the shared randomness protocol is included, and extract it. */ if (ns->type == NS_TYPE_VOTE) { dirvote_parse_sr_commits(ns, tokens); } /* For both a vote and consensus, extract the shared random values. */ if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS) { extract_shared_random_srvs(ns, tokens); } /* Parse routerstatus lines. */ rs_tokens = smartlist_new(); rs_area = memarea_new(); s = end_of_header; ns->routerstatus_list = smartlist_new(); while (!strcmpstart(s, "r ")) { if (ns->type != NS_TYPE_CONSENSUS) { vote_routerstatus_t *rs = tor_malloc_zero(sizeof(vote_routerstatus_t)); if (routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, ns, rs, 0, 0)) { smartlist_add(ns->routerstatus_list, rs); } else { vote_routerstatus_free(rs); } } else { routerstatus_t *rs; if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, NULL, NULL, ns->consensus_method, flav))) { /* Use exponential-backoff scheduling when downloading microdescs */ smartlist_add(ns->routerstatus_list, rs); } } } for (i = 1; i < smartlist_len(ns->routerstatus_list); ++i) { routerstatus_t *rs1, *rs2; if (ns->type != NS_TYPE_CONSENSUS) { vote_routerstatus_t *a = smartlist_get(ns->routerstatus_list, i-1); vote_routerstatus_t *b = smartlist_get(ns->routerstatus_list, i); rs1 = &a->status; rs2 = &b->status; } else { rs1 = smartlist_get(ns->routerstatus_list, i-1); rs2 = smartlist_get(ns->routerstatus_list, i); } if (fast_memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) >= 0) { log_warn(LD_DIR, "Networkstatus entries not sorted by identity digest"); goto err; } } if (ns_type != NS_TYPE_CONSENSUS) { digest256map_t *ed_id_map = digest256map_new(); SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, vote_routerstatus_t *, vrs) { if (! vrs->has_ed25519_listing || tor_mem_is_zero((const char *)vrs->ed25519_id, DIGEST256_LEN)) continue; if (digest256map_get(ed_id_map, vrs->ed25519_id) != NULL) { log_warn(LD_DIR, "Vote networkstatus ed25519 identities were not " "unique"); digest256map_free(ed_id_map, NULL); goto err; } digest256map_set(ed_id_map, vrs->ed25519_id, (void*)1); } SMARTLIST_FOREACH_END(vrs); digest256map_free(ed_id_map, NULL); } /* Parse footer; check signature. */ footer_tokens = smartlist_new(); if ((end_of_footer = strstr(s, "\nnetwork-status-version "))) ++end_of_footer; else end_of_footer = s + strlen(s); if (tokenize_string(area,s, end_of_footer, footer_tokens, networkstatus_vote_footer_token_table, 0)) { log_warn(LD_DIR, "Error tokenizing network-status vote footer."); goto err; } { int found_sig = 0; SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { tok = _tok; if (tok->tp == K_DIRECTORY_SIGNATURE) found_sig = 1; else if (found_sig) { log_warn(LD_DIR, "Extraneous token after first directory-signature"); goto err; } } SMARTLIST_FOREACH_END(_tok); } if ((tok = find_opt_by_keyword(footer_tokens, K_DIRECTORY_FOOTER))) { if (tok != smartlist_get(footer_tokens, 0)) { log_warn(LD_DIR, "Misplaced directory-footer token"); goto err; } } tok = find_opt_by_keyword(footer_tokens, K_BW_WEIGHTS); if (tok) { ns->weight_params = smartlist_new(); for (i = 0; i < tok->n_args; ++i) { int ok=0; char *eq = strchr(tok->args[i], '='); if (!eq) { log_warn(LD_DIR, "Bad element '%s' in weight params", escaped(tok->args[i])); goto err; } tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); if (!ok) { log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); goto err; } smartlist_add_strdup(ns->weight_params, tok->args[i]); } } SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { char declared_identity[DIGEST_LEN]; networkstatus_voter_info_t *v; document_signature_t *sig; const char *id_hexdigest = NULL; const char *sk_hexdigest = NULL; digest_algorithm_t alg = DIGEST_SHA1; tok = _tok; if (tok->tp != K_DIRECTORY_SIGNATURE) continue; tor_assert(tok->n_args >= 2); if (tok->n_args == 2) { id_hexdigest = tok->args[0]; sk_hexdigest = tok->args[1]; } else { const char *algname = tok->args[0]; int a; id_hexdigest = tok->args[1]; sk_hexdigest = tok->args[2]; a = crypto_digest_algorithm_parse_name(algname); if (a<0) { log_warn(LD_DIR, "Unknown digest algorithm %s; skipping", escaped(algname)); continue; } alg = a; } if (!tok->object_type || strcmp(tok->object_type, "SIGNATURE") || tok->object_size < 128 || tok->object_size > 512) { log_warn(LD_DIR, "Bad object type or length on directory-signature"); goto err; } if (strlen(id_hexdigest) != HEX_DIGEST_LEN || base16_decode(declared_identity, sizeof(declared_identity), id_hexdigest, HEX_DIGEST_LEN) != sizeof(declared_identity)) { log_warn(LD_DIR, "Error decoding declared identity %s in " "network-status document.", escaped(id_hexdigest)); goto err; } if (!(v = networkstatus_get_voter_by_id(ns, declared_identity))) { log_warn(LD_DIR, "ID on signature on network-status document does " "not match any declared directory source."); goto err; } sig = tor_malloc_zero(sizeof(document_signature_t)); memcpy(sig->identity_digest, v->identity_digest, DIGEST_LEN); sig->alg = alg; if (strlen(sk_hexdigest) != HEX_DIGEST_LEN || base16_decode(sig->signing_key_digest, sizeof(sig->signing_key_digest), sk_hexdigest, HEX_DIGEST_LEN) != sizeof(sig->signing_key_digest)) { log_warn(LD_DIR, "Error decoding declared signing key digest %s in " "network-status document.", escaped(sk_hexdigest)); tor_free(sig); goto err; } if (ns->type != NS_TYPE_CONSENSUS) { 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."); tor_free(sig); goto err; } } if (networkstatus_get_voter_sig_by_alg(v, sig->alg)) { /* We already parsed a vote with this algorithm from this voter. Use the first one. */ log_fn(LOG_PROTOCOL_WARN, LD_DIR, "We received a networkstatus " "that contains two signatures from the same voter with the same " "algorithm. Ignoring the second signature."); tor_free(sig); continue; } if (ns->type != NS_TYPE_CONSENSUS) { if (check_signature_token(ns_digests.d[DIGEST_SHA1], DIGEST_LEN, tok, ns->cert->signing_key, 0, "network-status document")) { tor_free(sig); goto err; } sig->good_signature = 1; } else { if (tok->object_size >= INT_MAX || tok->object_size >= SIZE_T_CEILING) { tor_free(sig); goto err; } sig->signature = tor_memdup(tok->object_body, tok->object_size); sig->signature_len = (int) tok->object_size; } smartlist_add(v->sigs, sig); ++n_signatures; } SMARTLIST_FOREACH_END(_tok); if (! n_signatures) { log_warn(LD_DIR, "No signatures on networkstatus document."); goto err; } else if (ns->type == NS_TYPE_VOTE && n_signatures != 1) { log_warn(LD_DIR, "Received more than one signature on a " "network-status vote."); goto err; } if (eos_out) *eos_out = end_of_footer; goto done; err: dump_desc(s_dup, "v3 networkstatus"); networkstatus_vote_free(ns); ns = NULL; done: if (tokens) { SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); smartlist_free(tokens); } if (voter) { if (voter->sigs) { SMARTLIST_FOREACH(voter->sigs, document_signature_t *, sig, document_signature_free(sig)); smartlist_free(voter->sigs); } tor_free(voter->nickname); tor_free(voter->address); tor_free(voter->contact); tor_free(voter); } if (rs_tokens) { SMARTLIST_FOREACH(rs_tokens, directory_token_t *, t, token_clear(t)); smartlist_free(rs_tokens); } if (footer_tokens) { SMARTLIST_FOREACH(footer_tokens, directory_token_t *, t, token_clear(t)); smartlist_free(footer_tokens); } if (area) { DUMP_AREA(area, "v3 networkstatus"); memarea_drop_all(area); } if (rs_area) memarea_drop_all(rs_area); tor_free(last_kwd); return ns; } /** Return the common_digests_t that holds the digests of the * flavor_name-flavored networkstatus according to the detached * signatures document sigs, allocating a new common_digests_t as * needed. */ static common_digests_t * detached_get_digests(ns_detached_signatures_t *sigs, const char *flavor_name) { common_digests_t *d = strmap_get(sigs->digests, flavor_name); if (!d) { d = tor_malloc_zero(sizeof(common_digests_t)); strmap_set(sigs->digests, flavor_name, d); } return d; } /** Return the list of signatures of the flavor_name-flavored * networkstatus according to the detached signatures document sigs, * allocating a new common_digests_t as needed. */ static smartlist_t * detached_get_signatures(ns_detached_signatures_t *sigs, const char *flavor_name) { smartlist_t *sl = strmap_get(sigs->signatures, flavor_name); if (!sl) { sl = smartlist_new(); strmap_set(sigs->signatures, flavor_name, sl); } return sl; } /** Parse a detached v3 networkstatus signature document between s and * eos and return the result. Return -1 on failure. */ ns_detached_signatures_t * networkstatus_parse_detached_signatures(const char *s, const char *eos) { /* XXXX there is too much duplicate shared between this function and * networkstatus_parse_vote_from_string(). */ directory_token_t *tok; memarea_t *area = NULL; common_digests_t *digests; smartlist_t *tokens = smartlist_new(); ns_detached_signatures_t *sigs = tor_malloc_zero(sizeof(ns_detached_signatures_t)); sigs->digests = strmap_new(); sigs->signatures = strmap_new(); if (!eos) eos = s + strlen(s); area = memarea_new(); if (tokenize_string(area,s, eos, tokens, networkstatus_detached_signature_token_table, 0)) { log_warn(LD_DIR, "Error tokenizing detached networkstatus signatures"); goto err; } /* Grab all the digest-like tokens. */ SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { const char *algname; digest_algorithm_t alg; const char *flavor; const char *hexdigest; size_t expected_length, digest_length; tok = _tok; if (tok->tp == K_CONSENSUS_DIGEST) { algname = "sha1"; alg = DIGEST_SHA1; flavor = "ns"; hexdigest = tok->args[0]; } else if (tok->tp == K_ADDITIONAL_DIGEST) { int a = crypto_digest_algorithm_parse_name(tok->args[1]); if (a<0) { log_warn(LD_DIR, "Unrecognized algorithm name %s", tok->args[0]); continue; } alg = (digest_algorithm_t) a; flavor = tok->args[0]; algname = tok->args[1]; hexdigest = tok->args[2]; } else { continue; } digest_length = crypto_digest_algorithm_get_length(alg); expected_length = digest_length * 2; /* hex encoding */ if (strlen(hexdigest) != expected_length) { log_warn(LD_DIR, "Wrong length on consensus-digest in detached " "networkstatus signatures"); goto err; } digests = detached_get_digests(sigs, flavor); tor_assert(digests); if (!tor_mem_is_zero(digests->d[alg], digest_length)) { log_warn(LD_DIR, "Multiple digests for %s with %s on detached " "signatures document", flavor, algname); continue; } if (base16_decode(digests->d[alg], digest_length, hexdigest, strlen(hexdigest)) != (int) digest_length) { log_warn(LD_DIR, "Bad encoding on consensus-digest in detached " "networkstatus signatures"); goto err; } } SMARTLIST_FOREACH_END(_tok); tok = find_by_keyword(tokens, K_VALID_AFTER); if (parse_iso_time(tok->args[0], &sigs->valid_after)) { log_warn(LD_DIR, "Bad valid-after in detached networkstatus signatures"); goto err; } tok = find_by_keyword(tokens, K_FRESH_UNTIL); if (parse_iso_time(tok->args[0], &sigs->fresh_until)) { log_warn(LD_DIR, "Bad fresh-until in detached networkstatus signatures"); goto err; } tok = find_by_keyword(tokens, K_VALID_UNTIL); if (parse_iso_time(tok->args[0], &sigs->valid_until)) { log_warn(LD_DIR, "Bad valid-until in detached networkstatus signatures"); goto err; } SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { const char *id_hexdigest; const char *sk_hexdigest; const char *algname; const char *flavor; digest_algorithm_t alg; char id_digest[DIGEST_LEN]; char sk_digest[DIGEST_LEN]; smartlist_t *siglist; document_signature_t *sig; int is_duplicate; tok = _tok; if (tok->tp == K_DIRECTORY_SIGNATURE) { tor_assert(tok->n_args >= 2); flavor = "ns"; algname = "sha1"; id_hexdigest = tok->args[0]; sk_hexdigest = tok->args[1]; } else if (tok->tp == K_ADDITIONAL_SIGNATURE) { tor_assert(tok->n_args >= 4); flavor = tok->args[0]; algname = tok->args[1]; id_hexdigest = tok->args[2]; sk_hexdigest = tok->args[3]; } else { continue; } { int a = crypto_digest_algorithm_parse_name(algname); if (a<0) { log_warn(LD_DIR, "Unrecognized algorithm name %s", algname); continue; } alg = (digest_algorithm_t) a; } if (!tok->object_type || strcmp(tok->object_type, "SIGNATURE") || tok->object_size < 128 || tok->object_size > 512) { log_warn(LD_DIR, "Bad object type or length on directory-signature"); goto err; } if (strlen(id_hexdigest) != HEX_DIGEST_LEN || base16_decode(id_digest, sizeof(id_digest), id_hexdigest, HEX_DIGEST_LEN) != sizeof(id_digest)) { log_warn(LD_DIR, "Error decoding declared identity %s in " "network-status vote.", escaped(id_hexdigest)); goto err; } if (strlen(sk_hexdigest) != HEX_DIGEST_LEN || base16_decode(sk_digest, sizeof(sk_digest), sk_hexdigest, HEX_DIGEST_LEN) != sizeof(sk_digest)) { log_warn(LD_DIR, "Error decoding declared signing key digest %s in " "network-status vote.", escaped(sk_hexdigest)); goto err; } siglist = detached_get_signatures(sigs, flavor); is_duplicate = 0; SMARTLIST_FOREACH(siglist, document_signature_t *, dsig, { if (dsig->alg == alg && tor_memeq(id_digest, dsig->identity_digest, DIGEST_LEN) && tor_memeq(sk_digest, dsig->signing_key_digest, DIGEST_LEN)) { is_duplicate = 1; } }); if (is_duplicate) { log_warn(LD_DIR, "Two signatures with identical keys and algorithm " "found."); continue; } sig = tor_malloc_zero(sizeof(document_signature_t)); sig->alg = alg; memcpy(sig->identity_digest, id_digest, DIGEST_LEN); memcpy(sig->signing_key_digest, sk_digest, DIGEST_LEN); if (tok->object_size >= INT_MAX || tok->object_size >= SIZE_T_CEILING) { tor_free(sig); goto err; } sig->signature = tor_memdup(tok->object_body, tok->object_size); sig->signature_len = (int) tok->object_size; smartlist_add(siglist, sig); } SMARTLIST_FOREACH_END(_tok); goto done; err: ns_detached_signatures_free(sigs); sigs = NULL; done: SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); smartlist_free(tokens); if (area) { DUMP_AREA(area, "detached signatures"); memarea_drop_all(area); } return sigs; } /** Parse the addr policy in the string s and return it. If * assume_action is nonnegative, then insert its action (ADDR_POLICY_ACCEPT or * ADDR_POLICY_REJECT) for items that specify no action. * * Returns NULL on policy errors. * * Set *malformed_list to true if the entire policy list should be * discarded. Otherwise, set it to false, and only this item should be ignored * on error - the rest of the policy list can continue to be processed and * used. * * The addr_policy_t returned by this function can have its address set to * AF_UNSPEC for '*'. Use policy_expand_unspec() to turn this into a pair * of AF_INET and AF_INET6 items. */ MOCK_IMPL(addr_policy_t *, router_parse_addr_policy_item_from_string,(const char *s, int assume_action, int *malformed_list)) { directory_token_t *tok = NULL; const char *cp, *eos; /* Longest possible policy is * "accept6 [ffff:ffff:..255]/128:10000-65535", * which contains a max-length IPv6 address, plus 26 characters. * But note that there can be an arbitrary amount of space between the * accept and the address:mask/port element. * We don't need to multiply TOR_ADDR_BUF_LEN by 2, as there is only one * IPv6 address. But making the buffer shorter might cause valid long lines, * which parsed in previous versions, to fail to parse in new versions. * (These lines would have to have excessive amounts of whitespace.) */ char line[TOR_ADDR_BUF_LEN*2 + 32]; addr_policy_t *r; memarea_t *area = NULL; tor_assert(malformed_list); *malformed_list = 0; s = eat_whitespace(s); /* We can only do assume_action on []-quoted IPv6, as "a" (accept) * and ":" (port separator) are ambiguous */ if ((*s == '*' || *s == '[' || TOR_ISDIGIT(*s)) && assume_action >= 0) { if (tor_snprintf(line, sizeof(line), "%s %s", assume_action == ADDR_POLICY_ACCEPT?"accept":"reject", s)<0) { log_warn(LD_DIR, "Policy %s is too long.", escaped(s)); return NULL; } cp = line; tor_strlower(line); } else { /* assume an already well-formed address policy line */ cp = s; } eos = cp + strlen(cp); area = memarea_new(); tok = get_next_token(area, &cp, eos, routerdesc_token_table); if (tok->tp == ERR_) { log_warn(LD_DIR, "Error reading address policy: %s", tok->error); goto err; } if (tok->tp != K_ACCEPT && tok->tp != K_ACCEPT6 && tok->tp != K_REJECT && tok->tp != K_REJECT6) { log_warn(LD_DIR, "Expected 'accept' or 'reject'."); goto err; } /* Use the extended interpretation of accept/reject *, * expanding it into an IPv4 wildcard and an IPv6 wildcard. * Also permit *4 and *6 for IPv4 and IPv6 only wildcards. */ r = router_parse_addr_policy(tok, TAPMP_EXTENDED_STAR); if (!r) { goto err; } /* Ensure that accept6/reject6 fields are followed by IPv6 addresses. * AF_UNSPEC addresses are only permitted on the accept/reject field type. * Unlike descriptors, torrcs exit policy accept/reject can be followed by * either an IPv4 or IPv6 address. */ if ((tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) && tor_addr_family(&r->addr) != AF_INET6) { /* This is a non-fatal error, just ignore this one entry. */ *malformed_list = 0; log_warn(LD_DIR, "IPv4 address '%s' with accept6/reject6 field type in " "exit policy. Ignoring, but continuing to parse rules. (Use " "accept/reject with IPv4 addresses.)", tok->n_args == 1 ? tok->args[0] : ""); addr_policy_free(r); r = NULL; goto done; } goto done; err: *malformed_list = 1; r = NULL; done: token_clear(tok); if (area) { DUMP_AREA(area, "policy item"); memarea_drop_all(area); } return r; } /** Add an exit policy stored in the token tok to the router info in * router. Return 0 on success, -1 on failure. */ static int router_add_exit_policy(routerinfo_t *router, directory_token_t *tok) { addr_policy_t *newe; /* Use the standard interpretation of accept/reject *, an IPv4 wildcard. */ newe = router_parse_addr_policy(tok, 0); if (!newe) return -1; if (! router->exit_policy) router->exit_policy = smartlist_new(); /* Ensure that in descriptors, accept/reject fields are followed by * IPv4 addresses, and accept6/reject6 fields are followed by * IPv6 addresses. Unlike torrcs, descriptor exit policies do not permit * accept/reject followed by IPv6. */ if (((tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) && tor_addr_family(&newe->addr) == AF_INET) || ((tok->tp == K_ACCEPT || tok->tp == K_REJECT) && tor_addr_family(&newe->addr) == AF_INET6)) { /* There's nothing the user can do about other relays' descriptors, * so we don't provide usage advice here. */ log_warn(LD_DIR, "Mismatch between field type and address type in exit " "policy '%s'. Discarding entire router descriptor.", tok->n_args == 1 ? tok->args[0] : ""); addr_policy_free(newe); return -1; } smartlist_add(router->exit_policy, newe); return 0; } /** Given a K_ACCEPT[6] or K_REJECT[6] token and a router, create and return * a new exit_policy_t corresponding to the token. If TAPMP_EXTENDED_STAR * is set in fmt_flags, K_ACCEPT6 and K_REJECT6 tokens followed by * * expand to IPv6-only policies, otherwise they expand to IPv4 and IPv6 * policies */ static addr_policy_t * router_parse_addr_policy(directory_token_t *tok, unsigned fmt_flags) { addr_policy_t newe; char *arg; tor_assert(tok->tp == K_REJECT || tok->tp == K_REJECT6 || tok->tp == K_ACCEPT || tok->tp == K_ACCEPT6); if (tok->n_args != 1) return NULL; arg = tok->args[0]; if (!strcmpstart(arg,"private")) return router_parse_addr_policy_private(tok); memset(&newe, 0, sizeof(newe)); if (tok->tp == K_REJECT || tok->tp == K_REJECT6) newe.policy_type = ADDR_POLICY_REJECT; else newe.policy_type = ADDR_POLICY_ACCEPT; /* accept6/reject6 * produces an IPv6 wildcard address only. * (accept/reject * produces rules for IPv4 and IPv6 wildcard addresses.) */ if ((fmt_flags & TAPMP_EXTENDED_STAR) && (tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6)) { fmt_flags |= TAPMP_STAR_IPV6_ONLY; } if (tor_addr_parse_mask_ports(arg, fmt_flags, &newe.addr, &newe.maskbits, &newe.prt_min, &newe.prt_max) < 0) { log_warn(LD_DIR,"Couldn't parse line %s. Dropping", escaped(arg)); return NULL; } return addr_policy_get_canonical_entry(&newe); } /** Parse an exit policy line of the format "accept[6]/reject[6] private:...". * This didn't exist until Tor 0.1.1.15, so nobody should generate it in * router descriptors until earlier versions are obsolete. * * accept/reject and accept6/reject6 private all produce rules for both * IPv4 and IPv6 addresses. */ static addr_policy_t * router_parse_addr_policy_private(directory_token_t *tok) { const char *arg; uint16_t port_min, port_max; addr_policy_t result; arg = tok->args[0]; if (strcmpstart(arg, "private")) return NULL; arg += strlen("private"); arg = (char*) eat_whitespace(arg); if (!arg || *arg != ':') return NULL; if (parse_port_range(arg+1, &port_min, &port_max)<0) return NULL; memset(&result, 0, sizeof(result)); if (tok->tp == K_REJECT || tok->tp == K_REJECT6) result.policy_type = ADDR_POLICY_REJECT; else result.policy_type = ADDR_POLICY_ACCEPT; result.is_private = 1; result.prt_min = port_min; result.prt_max = port_max; if (tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) { log_warn(LD_GENERAL, "'%s' expands into rules which apply to all private IPv4 and " "IPv6 addresses. (Use accept/reject private:* for IPv4 and " "IPv6.)", tok->n_args == 1 ? tok->args[0] : ""); } return addr_policy_get_canonical_entry(&result); } /** Log and exit if t is malformed */ void assert_addr_policy_ok(smartlist_t *lst) { if (!lst) return; SMARTLIST_FOREACH(lst, addr_policy_t *, t, { tor_assert(t->policy_type == ADDR_POLICY_REJECT || t->policy_type == ADDR_POLICY_ACCEPT); tor_assert(t->prt_min <= t->prt_max); }); } /** Return a newly allocated smartlist of all accept or reject tokens in * s. */ static smartlist_t * find_all_exitpolicy(smartlist_t *s) { smartlist_t *out = smartlist_new(); SMARTLIST_FOREACH(s, directory_token_t *, t, if (t->tp == K_ACCEPT || t->tp == K_ACCEPT6 || t->tp == K_REJECT || t->tp == K_REJECT6) smartlist_add(out,t)); return out; } /** Assuming that s starts with a microdesc, return the start of the * *NEXT* one. Return NULL on "not found." */ static const char * find_start_of_next_microdesc(const char *s, const char *eos) { int started_with_annotations; s = eat_whitespace_eos(s, eos); if (!s) return NULL; #define CHECK_LENGTH() STMT_BEGIN \ if (s+32 > eos) \ return NULL; \ STMT_END #define NEXT_LINE() STMT_BEGIN \ s = memchr(s, '\n', eos-s); \ if (!s || s+1 >= eos) \ return NULL; \ s++; \ STMT_END CHECK_LENGTH(); started_with_annotations = (*s == '@'); if (started_with_annotations) { /* Start by advancing to the first non-annotation line. */ while (*s == '@') NEXT_LINE(); } CHECK_LENGTH(); /* Now we should be pointed at an onion-key line. If we are, then skip * it. */ if (!strcmpstart(s, "onion-key")) NEXT_LINE(); /* Okay, now we're pointed at the first line of the microdescriptor which is not an annotation or onion-key. The next line that _is_ an annotation or onion-key is the start of the next microdescriptor. */ while (s+32 < eos) { if (*s == '@' || !strcmpstart(s, "onion-key")) return s; NEXT_LINE(); } return NULL; #undef CHECK_LENGTH #undef NEXT_LINE } /** Parse as many microdescriptors as are found from the string starting at * s and ending at eos. If allow_annotations is set, read any * annotations we recognize and ignore ones we don't. * * If saved_location isn't SAVED_IN_CACHE, make a local copy of each * descriptor in the body field of each microdesc_t. * * Return all newly parsed microdescriptors in a newly allocated * smartlist_t. If invalid_disgests_out is provided, add a SHA256 * microdesc digest to it for every microdesc that we found to be badly * formed. (This may cause duplicates) */ smartlist_t * microdescs_parse_from_string(const char *s, const char *eos, int allow_annotations, saved_location_t where, smartlist_t *invalid_digests_out) { smartlist_t *tokens; smartlist_t *result; microdesc_t *md = NULL; memarea_t *area; const char *start = s; const char *start_of_next_microdesc; int flags = allow_annotations ? TS_ANNOTATIONS_OK : 0; const int copy_body = (where != SAVED_IN_CACHE); directory_token_t *tok; if (!eos) eos = s + strlen(s); s = eat_whitespace_eos(s, eos); area = memarea_new(); result = smartlist_new(); tokens = smartlist_new(); while (s < eos) { int okay = 0; start_of_next_microdesc = find_start_of_next_microdesc(s, eos); if (!start_of_next_microdesc) start_of_next_microdesc = eos; md = tor_malloc_zero(sizeof(microdesc_t)); { const char *cp = tor_memstr(s, start_of_next_microdesc-s, "onion-key"); const int no_onion_key = (cp == NULL); if (no_onion_key) { cp = s; /* So that we have *some* junk to put in the body */ } md->bodylen = start_of_next_microdesc - cp; md->saved_location = where; if (copy_body) md->body = tor_memdup_nulterm(cp, md->bodylen); else md->body = (char*)cp; md->off = cp - start; crypto_digest256(md->digest, md->body, md->bodylen, DIGEST_SHA256); if (no_onion_key) { log_fn(LOG_PROTOCOL_WARN, LD_DIR, "Malformed or truncated descriptor"); goto next; } } if (tokenize_string(area, s, start_of_next_microdesc, tokens, microdesc_token_table, flags)) { log_warn(LD_DIR, "Unparseable microdescriptor"); goto next; } if ((tok = find_opt_by_keyword(tokens, A_LAST_LISTED))) { if (parse_iso_time(tok->args[0], &md->last_listed)) { log_warn(LD_DIR, "Bad last-listed time in microdescriptor"); goto next; } } tok = find_by_keyword(tokens, K_ONION_KEY); if (!crypto_pk_public_exponent_ok(tok->key)) { log_warn(LD_DIR, "Relay's onion key had invalid exponent."); goto next; } router_set_rsa_onion_pkey(tok->key, &md->onion_pkey, &md->onion_pkey_len); crypto_pk_free(tok->key); if ((tok = find_opt_by_keyword(tokens, K_ONION_KEY_NTOR))) { curve25519_public_key_t k; tor_assert(tok->n_args >= 1); if (curve25519_public_from_base64(&k, tok->args[0]) < 0) { log_warn(LD_DIR, "Bogus ntor-onion-key in microdesc"); goto next; } md->onion_curve25519_pkey = tor_memdup(&k, sizeof(curve25519_public_key_t)); } smartlist_t *id_lines = find_all_by_keyword(tokens, K_ID); if (id_lines) { SMARTLIST_FOREACH_BEGIN(id_lines, directory_token_t *, t) { tor_assert(t->n_args >= 2); if (!strcmp(t->args[0], "ed25519")) { if (md->ed25519_identity_pkey) { log_warn(LD_DIR, "Extra ed25519 key in microdesc"); smartlist_free(id_lines); goto next; } ed25519_public_key_t k; if (ed25519_public_from_base64(&k, t->args[1])<0) { log_warn(LD_DIR, "Bogus ed25519 key in microdesc"); smartlist_free(id_lines); goto next; } md->ed25519_identity_pkey = tor_memdup(&k, sizeof(k)); } } SMARTLIST_FOREACH_END(t); smartlist_free(id_lines); } { smartlist_t *a_lines = find_all_by_keyword(tokens, K_A); if (a_lines) { find_single_ipv6_orport(a_lines, &md->ipv6_addr, &md->ipv6_orport); smartlist_free(a_lines); } } if ((tok = find_opt_by_keyword(tokens, K_FAMILY))) { int i; md->family = smartlist_new(); for (i=0;in_args;++i) { if (!is_legal_nickname_or_hexdigest(tok->args[i])) { log_warn(LD_DIR, "Illegal nickname %s in family line", escaped(tok->args[i])); goto next; } smartlist_add_strdup(md->family, tok->args[i]); } } if ((tok = find_opt_by_keyword(tokens, K_P))) { md->exit_policy = parse_short_policy(tok->args[0]); } if ((tok = find_opt_by_keyword(tokens, K_P6))) { md->ipv6_exit_policy = parse_short_policy(tok->args[0]); } smartlist_add(result, md); okay = 1; md = NULL; next: if (! okay && invalid_digests_out) { smartlist_add(invalid_digests_out, tor_memdup(md->digest, DIGEST256_LEN)); } microdesc_free(md); md = NULL; SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); memarea_clear(area); smartlist_clear(tokens); s = start_of_next_microdesc; } SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); memarea_drop_all(area); smartlist_free(tokens); return result; } /** Called on startup; right now we just handle scanning the unparseable * descriptor dumps, but hang anything else we might need to do in the * future here as well. */ void routerparse_init(void) { /* * Check both if the sandbox is active and whether it's configured; no * point in loading all that if we won't be able to use it after the * sandbox becomes active. */ if (!(sandbox_is_active() || get_options()->Sandbox)) { dump_desc_init(); } } /** Clean up all data structures used by routerparse.c at exit */ void routerparse_free_all(void) { dump_desc_fifo_cleanup(); }