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tor/src/or/routerparse.c

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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2017, 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:
* <ul>
* <li>router descriptors (managed from routerlist.c)
* <li>extra-info documents (managed from routerlist.c)
* <li>microdescriptors (managed from microdesc.c)
* <li>vote and consensus networkstatus documents, and the routerstatus_t
* objects that they comprise (managed from networkstatus.c)
* <li>detached-signature objects used by authorities for gathering
* signatures on the networkstatus consensus (managed from dirvote.c)
* <li>authority key certificates (managed from routerlist.c)
* <li>hidden service descriptors (managed from rendcommon.c and rendcache.c)
* </ul>
*
* For no terribly good reason, the functions to <i>generate</i> signatures on
* the above directory objects are also in this module.
**/
#define ROUTERPARSE_PRIVATE
#include "or.h"
#include "circuitstats.h"
#include "config.h"
#include "crypto_util.h"
#include "dirauth/shared_random.h"
#include "dirserv.h"
#include "entrynodes.h"
#include "memarea.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "parsecommon.h"
#include "policies.h"
#include "protover.h"
#include "rendcommon.h"
#include "rephist.h"
#include "router.h"
#include "routerkeys.h"
#include "routerlist.h"
#include "routerparse.h"
#include "sandbox.h"
#include "shared_random_client.h"
#include "torcert.h"
#include "voting_schedule.h"
#include "dirauth/dirvote.h"
#include "rend_authorized_client_st.h"
#include "rend_intro_point_st.h"
#include "rend_service_descriptor_st.h"
#include "tor_version_st.h"
#undef log
#include <math.h>
/****************************************************************************/
/** 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 common to V3 authority certificates and V3 consensuses. */
#define CERTIFICATE_MEMBERS \
T1("dir-key-certificate-version", K_DIR_KEY_CERTIFICATE_VERSION, \
GE(1), NO_OBJ ), \
T1("dir-identity-key", K_DIR_IDENTITY_KEY, NO_ARGS, NEED_KEY ),\
T1("dir-key-published",K_DIR_KEY_PUBLISHED, CONCAT_ARGS, NO_OBJ), \
T1("dir-key-expires", K_DIR_KEY_EXPIRES, CONCAT_ARGS, NO_OBJ), \
T1("dir-signing-key", K_DIR_SIGNING_KEY, NO_ARGS, NEED_KEY ),\
T1("dir-key-crosscert", K_DIR_KEY_CROSSCERT, NO_ARGS, NEED_OBJ ),\
T1("dir-key-certification", K_DIR_KEY_CERTIFICATION, \
NO_ARGS, NEED_OBJ), \
T01("dir-address", K_DIR_ADDRESS, GE(1), NO_OBJ),
/** List of tokens recognized in V3 authority certificates. */
static token_rule_t dir_key_certificate_table[] = {
CERTIFICATE_MEMBERS
T1("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ),
END_OF_TABLE
};
/** List of tokens recognized in rendezvous service descriptors */
static token_rule_t desc_token_table[] = {
T1_START("rendezvous-service-descriptor", R_RENDEZVOUS_SERVICE_DESCRIPTOR,
EQ(1), NO_OBJ),
T1("version", R_VERSION, EQ(1), NO_OBJ),
T1("permanent-key", R_PERMANENT_KEY, NO_ARGS, NEED_KEY_1024),
T1("secret-id-part", R_SECRET_ID_PART, EQ(1), NO_OBJ),
T1("publication-time", R_PUBLICATION_TIME, CONCAT_ARGS, NO_OBJ),
T1("protocol-versions", R_PROTOCOL_VERSIONS, EQ(1), NO_OBJ),
T01("introduction-points", R_INTRODUCTION_POINTS, NO_ARGS, NEED_OBJ),
T1_END("signature", R_SIGNATURE, NO_ARGS, NEED_OBJ),
END_OF_TABLE
};
/** List of tokens recognized in the (encrypted) list of introduction points of
* rendezvous service descriptors */
static token_rule_t ipo_token_table[] = {
T1_START("introduction-point", R_IPO_IDENTIFIER, EQ(1), NO_OBJ),
T1("ip-address", R_IPO_IP_ADDRESS, EQ(1), NO_OBJ),
T1("onion-port", R_IPO_ONION_PORT, EQ(1), NO_OBJ),
T1("onion-key", R_IPO_ONION_KEY, NO_ARGS, NEED_KEY_1024),
T1("service-key", R_IPO_SERVICE_KEY, NO_ARGS, NEED_KEY_1024),
END_OF_TABLE
};
/** List of tokens recognized in the (possibly encrypted) list of introduction
* points of rendezvous service descriptors */
static token_rule_t client_keys_token_table[] = {
T1_START("client-name", C_CLIENT_NAME, CONCAT_ARGS, NO_OBJ),
T1("descriptor-cookie", C_DESCRIPTOR_COOKIE, EQ(1), NO_OBJ),
T01("client-key", C_CLIENT_KEY, NO_ARGS, NEED_SKEY_1024),
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 ),
CERTIFICATE_MEMBERS
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 int router_get_hash_impl_helper(const char *s, size_t s_len,
const char *start_str,
const char *end_str, char end_c,
int log_severity,
const char **start_out, const char **end_out);
static int router_get_hash_impl(const char *s, size_t s_len, char *digest,
const char *start_str, const char *end_str,
char end_char,
digest_algorithm_t alg);
static int router_get_hashes_impl(const char *s, size_t s_len,
common_digests_t *digests,
const char *start_str, const char *end_str,
char end_char);
static smartlist_t *find_all_exitpolicy(smartlist_t *s);
#define CST_NO_CHECK_OBJTYPE (1<<0)
static int check_signature_token(const char *digest,
ssize_t digest_len,
directory_token_t *tok,
crypto_pk_t *pkey,
int flags,
const char *doctype);
#undef DEBUG_AREA_ALLOC
#ifdef DEBUG_AREA_ALLOC
#define DUMP_AREA(a,name) STMT_BEGIN \
size_t alloc=0, used=0; \
memarea_get_stats((a),&alloc,&used); \
log_debug(LD_MM, "Area for %s has %lu allocated; using %lu.", \
name, (unsigned long)alloc, (unsigned long)used); \
STMT_END
#else /* !(defined(DEBUG_AREA_ALLOC)) */
#define DUMP_AREA(a,name) STMT_NIL
#endif /* defined(DEBUG_AREA_ALLOC) */
/* Dump mechanism for unparseable descriptors */
/** List of dumped descriptors for FIFO cleanup purposes */
STATIC smartlist_t *descs_dumped = NULL;
/** Total size of dumped descriptors for FIFO cleanup */
STATIC uint64_t len_descs_dumped = 0;
/** Directory to stash dumps in */
static int have_dump_desc_dir = 0;
static int problem_with_dump_desc_dir = 0;
#define DESC_DUMP_DATADIR_SUBDIR "unparseable-descs"
#define DESC_DUMP_BASE_FILENAME "unparseable-desc"
/** Find the dump directory and check if we'll be able to create it */
static void
dump_desc_init(void)
{
char *dump_desc_dir;
dump_desc_dir = get_datadir_fname(DESC_DUMP_DATADIR_SUBDIR);
/*
* We just check for it, don't create it at this point; we'll
* create it when we need it if it isn't already there.
*/
if (check_private_dir(dump_desc_dir, CPD_CHECK, get_options()->User) < 0) {
/* Error, log and flag it as having a problem */
log_notice(LD_DIR,
"Doesn't look like we'll be able to create descriptor dump "
"directory %s; dumps will be disabled.",
dump_desc_dir);
problem_with_dump_desc_dir = 1;
tor_free(dump_desc_dir);
return;
}
/* Check if it exists */
switch (file_status(dump_desc_dir)) {
case FN_DIR:
/* We already have a directory */
have_dump_desc_dir = 1;
break;
case FN_NOENT:
/* Nothing, we'll need to create it later */
have_dump_desc_dir = 0;
break;
case FN_ERROR:
/* Log and flag having a problem */
log_notice(LD_DIR,
"Couldn't check whether descriptor dump directory %s already"
" exists: %s",
dump_desc_dir, strerror(errno));
problem_with_dump_desc_dir = 1;
break;
case FN_FILE:
case FN_EMPTY:
default:
/* Something else was here! */
log_notice(LD_DIR,
"Descriptor dump directory %s already exists and isn't a "
"directory",
dump_desc_dir);
problem_with_dump_desc_dir = 1;
}
if (have_dump_desc_dir && !problem_with_dump_desc_dir) {
dump_desc_populate_fifo_from_directory(dump_desc_dir);
}
tor_free(dump_desc_dir);
}
/** Create the dump directory if needed and possible */
static void
dump_desc_create_dir(void)
{
char *dump_desc_dir;
/* If the problem flag is set, skip it */
if (problem_with_dump_desc_dir) return;
/* Do we need it? */
if (!have_dump_desc_dir) {
dump_desc_dir = get_datadir_fname(DESC_DUMP_DATADIR_SUBDIR);
if (check_private_dir(dump_desc_dir, CPD_CREATE,
get_options()->User) < 0) {
log_notice(LD_DIR,
"Failed to create descriptor dump directory %s",
dump_desc_dir);
problem_with_dump_desc_dir = 1;
}
/* Okay, we created it */
have_dump_desc_dir = 1;
tor_free(dump_desc_dir);
}
}
/** Dump desc FIFO/cleanup; take ownership of the given filename, add it to
* the FIFO, and clean up the oldest entries to the extent they exceed the
* configured cap. If any old entries with a matching hash existed, they
* just got overwritten right before this was called and we should adjust
* the total size counter without deleting them.
*/
static void
dump_desc_fifo_add_and_clean(char *filename, const uint8_t *digest_sha256,
size_t len)
{
dumped_desc_t *ent = NULL, *tmp;
uint64_t max_len;
tor_assert(filename != NULL);
tor_assert(digest_sha256 != NULL);
if (descs_dumped == NULL) {
/* We better have no length, then */
tor_assert(len_descs_dumped == 0);
/* Make a smartlist */
descs_dumped = smartlist_new();
}
/* Make a new entry to put this one in */
ent = tor_malloc_zero(sizeof(*ent));
ent->filename = filename;
ent->len = len;
ent->when = time(NULL);
memcpy(ent->digest_sha256, digest_sha256, DIGEST256_LEN);
/* Do we need to do some cleanup? */
max_len = get_options()->MaxUnparseableDescSizeToLog;
/* Iterate over the list until we've freed enough space */
while (len > max_len - len_descs_dumped &&
smartlist_len(descs_dumped) > 0) {
/* Get the oldest thing on the list */
tmp = (dumped_desc_t *)(smartlist_get(descs_dumped, 0));
/*
* Check if it matches the filename we just added, so we don't delete
* something we just emitted if we get repeated identical descriptors.
*/
if (strcmp(tmp->filename, filename) != 0) {
/* Delete it and adjust the length counter */
tor_unlink(tmp->filename);
tor_assert(len_descs_dumped >= tmp->len);
len_descs_dumped -= tmp->len;
log_info(LD_DIR,
"Deleting old unparseable descriptor dump %s due to "
"space limits",
tmp->filename);
} else {
/*
* Don't delete, but do adjust the counter since we will bump it
* later
*/
tor_assert(len_descs_dumped >= tmp->len);
len_descs_dumped -= tmp->len;
log_info(LD_DIR,
"Replacing old descriptor dump %s with new identical one",
tmp->filename);
}
/* Free it and remove it from the list */
smartlist_del_keeporder(descs_dumped, 0);
tor_free(tmp->filename);
tor_free(tmp);
}
/* Append our entry to the end of the list and bump the counter */
smartlist_add(descs_dumped, ent);
len_descs_dumped += len;
}
/** Check if we already have a descriptor for this hash and move it to the
* head of the queue if so. Return 1 if one existed and 0 otherwise.
*/
static int
dump_desc_fifo_bump_hash(const uint8_t *digest_sha256)
{
dumped_desc_t *match = NULL;
tor_assert(digest_sha256);
if (descs_dumped) {
/* Find a match if one exists */
SMARTLIST_FOREACH_BEGIN(descs_dumped, dumped_desc_t *, ent) {
if (ent &&
tor_memeq(ent->digest_sha256, digest_sha256, DIGEST256_LEN)) {
/*
* Save a pointer to the match and remove it from its current
* position.
*/
match = ent;
SMARTLIST_DEL_CURRENT_KEEPORDER(descs_dumped, ent);
break;
}
} SMARTLIST_FOREACH_END(ent);
if (match) {
/* Update the timestamp */
match->when = time(NULL);
/* Add it back at the end of the list */
smartlist_add(descs_dumped, match);
/* Indicate we found one */
return 1;
}
}
return 0;
}
/** Clean up on exit; just memory, leave the dumps behind
*/
STATIC void
dump_desc_fifo_cleanup(void)
{
if (descs_dumped) {
/* Free each descriptor */
SMARTLIST_FOREACH_BEGIN(descs_dumped, dumped_desc_t *, ent) {
tor_assert(ent);
tor_free(ent->filename);
tor_free(ent);
} SMARTLIST_FOREACH_END(ent);
/* Free the list */
smartlist_free(descs_dumped);
descs_dumped = NULL;
len_descs_dumped = 0;
}
}
/** Handle one file for dump_desc_populate_fifo_from_directory(); make sure
* the filename is sensibly formed and matches the file content, and either
* return a dumped_desc_t for it or remove the file and return NULL.
*/
MOCK_IMPL(STATIC dumped_desc_t *,
dump_desc_populate_one_file, (const char *dirname, const char *f))
{
dumped_desc_t *ent = NULL;
char *path = NULL, *desc = NULL;
const char *digest_str;
char digest[DIGEST256_LEN], content_digest[DIGEST256_LEN];
/* Expected prefix before digest in filenames */
const char *f_pfx = DESC_DUMP_BASE_FILENAME ".";
/*
* Stat while reading; this is important in case the file
* contains a NUL character.
*/
struct stat st;
/* Sanity-check args */
tor_assert(dirname != NULL);
tor_assert(f != NULL);
/* Form the full path */
tor_asprintf(&path, "%s" PATH_SEPARATOR "%s", dirname, f);
/* Check that f has the form DESC_DUMP_BASE_FILENAME.<digest256> */
if (!strcmpstart(f, f_pfx)) {
/* It matches the form, but is the digest parseable as such? */
digest_str = f + strlen(f_pfx);
if (base16_decode(digest, DIGEST256_LEN,
digest_str, strlen(digest_str)) != DIGEST256_LEN) {
/* We failed to decode it */
digest_str = NULL;
}
} else {
/* No match */
digest_str = NULL;
}
if (!digest_str) {
/* We couldn't get a sensible digest */
log_notice(LD_DIR,
"Removing unrecognized filename %s from unparseable "
"descriptors directory", f);
tor_unlink(path);
/* We're done */
goto done;
}
/*
* The filename has the form DESC_DUMP_BASE_FILENAME "." <digest256> and
* we've decoded the digest. Next, check that we can read it and the
* content matches this digest. We are relying on the fact that if the
* file contains a '\0', read_file_to_str() will allocate space for and
* read the entire file and return the correct size in st.
*/
desc = read_file_to_str(path, RFTS_IGNORE_MISSING|RFTS_BIN, &st);
if (!desc) {
/* We couldn't read it */
log_notice(LD_DIR,
"Failed to read %s from unparseable descriptors directory; "
"attempting to remove it.", f);
tor_unlink(path);
/* We're done */
goto done;
}
#if SIZE_MAX > UINT64_MAX
if (BUG((uint64_t)st.st_size > (uint64_t)SIZE_MAX)) {
/* LCOV_EXCL_START
* Should be impossible since RFTS above should have failed to read the
* huge file into RAM. */
goto done;
/* LCOV_EXCL_STOP */
}
#endif /* SIZE_MAX > UINT64_MAX */
if (BUG(st.st_size < 0)) {
/* LCOV_EXCL_START
* Should be impossible, since the OS isn't supposed to be b0rken. */
goto done;
/* LCOV_EXCL_STOP */
}
/* (Now we can be sure that st.st_size is safe to cast to a size_t.) */
/*
* We got one; now compute its digest and check that it matches the
* filename.
*/
if (crypto_digest256((char *)content_digest, desc, (size_t) st.st_size,
DIGEST_SHA256) < 0) {
/* Weird, but okay */
log_info(LD_DIR,
"Unable to hash content of %s from unparseable descriptors "
"directory", f);
tor_unlink(path);
/* We're done */
goto done;
}
/* Compare the digests */
if (tor_memneq(digest, content_digest, DIGEST256_LEN)) {
/* No match */
log_info(LD_DIR,
"Hash of %s from unparseable descriptors directory didn't "
"match its filename; removing it", f);
tor_unlink(path);
/* We're done */
goto done;
}
/* Okay, it's a match, we should prepare ent */
ent = tor_malloc_zero(sizeof(dumped_desc_t));
ent->filename = path;
memcpy(ent->digest_sha256, digest, DIGEST256_LEN);
ent->len = (size_t) st.st_size;
ent->when = st.st_mtime;
/* Null out path so we don't free it out from under ent */
path = NULL;
done:
/* Free allocations if we had them */
tor_free(desc);
tor_free(path);
return ent;
}
/** Sort helper for dump_desc_populate_fifo_from_directory(); compares
* the when field of dumped_desc_ts in a smartlist to put the FIFO in
* the correct order after reconstructing it from the directory.
*/
static int
dump_desc_compare_fifo_entries(const void **a_v, const void **b_v)
{
const dumped_desc_t **a = (const dumped_desc_t **)a_v;
const dumped_desc_t **b = (const dumped_desc_t **)b_v;
if ((a != NULL) && (*a != NULL)) {
if ((b != NULL) && (*b != NULL)) {
/* We have sensible dumped_desc_ts to compare */
if ((*a)->when < (*b)->when) {
return -1;
} else if ((*a)->when == (*b)->when) {
return 0;
} else {
return 1;
}
} else {
/*
* We shouldn't see this, but what the hell, NULLs precede everythin
* else
*/
return 1;
}
} else {
return -1;
}
}
/** Scan the contents of the directory, and update FIFO/counters; this will
* consistency-check descriptor dump filenames against hashes of descriptor
* dump file content, and remove any inconsistent/unreadable dumps, and then
* reconstruct the dump FIFO as closely as possible for the last time the
* tor process shut down. If a previous dump was repeated more than once and
* moved ahead in the FIFO, the mtime will not have been updated and the
* reconstructed order will be wrong, but will always be a permutation of
* the original.
*/
STATIC void
dump_desc_populate_fifo_from_directory(const char *dirname)
{
smartlist_t *files = NULL;
dumped_desc_t *ent = NULL;
tor_assert(dirname != NULL);
/* Get a list of files */
files = tor_listdir(dirname);
if (!files) {
log_notice(LD_DIR,
"Unable to get contents of unparseable descriptor dump "
"directory %s",
dirname);
return;
}
/*
* Iterate through the list and decide which files should go in the
* FIFO and which should be purged.
*/
SMARTLIST_FOREACH_BEGIN(files, char *, f) {
/* Try to get a FIFO entry */
ent = dump_desc_populate_one_file(dirname, f);
if (ent) {
/*
* We got one; add it to the FIFO. No need for duplicate checking
* here since we just verified the name and digest match.
*/
/* Make sure we have a list to add it to */
if (!descs_dumped) {
descs_dumped = smartlist_new();
len_descs_dumped = 0;
}
/* Add it and adjust the counter */
smartlist_add(descs_dumped, ent);
len_descs_dumped += ent->len;
}
/*
* If we didn't, we will have unlinked the file if necessary and
* possible, and emitted a log message about it, so just go on to
* the next.
*/
} SMARTLIST_FOREACH_END(f);
/* Did we get anything? */
if (descs_dumped != NULL) {
/* Sort the FIFO in order of increasing timestamp */
smartlist_sort(descs_dumped, dump_desc_compare_fifo_entries);
/* Log some stats */
log_info(LD_DIR,
"Reloaded unparseable descriptor dump FIFO with %d dump(s) "
"totaling " U64_FORMAT " bytes",
smartlist_len(descs_dumped), U64_PRINTF_ARG(len_descs_dumped));
}
/* Free the original list */
SMARTLIST_FOREACH(files, char *, f, tor_free(f));
smartlist_free(files);
}
/** For debugging purposes, dump unparseable descriptor *<b>desc</b> of
* type *<b>type</b> to file $DATADIR/unparseable-desc. Do not write more
* than one descriptor to disk per minute. If there is already such a
* file in the data directory, overwrite it. */
MOCK_IMPL(STATIC void,
dump_desc,(const char *desc, const char *type))
{
tor_assert(desc);
tor_assert(type);
size_t len;
/* The SHA256 of the string */
uint8_t digest_sha256[DIGEST256_LEN];
char digest_sha256_hex[HEX_DIGEST256_LEN+1];
/* Filename to log it to */
char *debugfile, *debugfile_base;
/* Get the hash for logging purposes anyway */
len = strlen(desc);
if (crypto_digest256((char *)digest_sha256, desc, len,
DIGEST_SHA256) < 0) {
log_info(LD_DIR,
"Unable to parse descriptor of type %s, and unable to even hash"
" it!", type);
goto err;
}
base16_encode(digest_sha256_hex, sizeof(digest_sha256_hex),
(const char *)digest_sha256, sizeof(digest_sha256));
/*
* We mention type and hash in the main log; don't clutter up the files
* with anything but the exact dump.
*/
tor_asprintf(&debugfile_base,
DESC_DUMP_BASE_FILENAME ".%s", digest_sha256_hex);
debugfile = get_datadir_fname2(DESC_DUMP_DATADIR_SUBDIR, debugfile_base);
/*
* Check if the sandbox is active or will become active; see comment
* below at the log message for why.
*/
if (!(sandbox_is_active() || get_options()->Sandbox)) {
if (len <= get_options()->MaxUnparseableDescSizeToLog) {
if (!dump_desc_fifo_bump_hash(digest_sha256)) {
/* Create the directory if needed */
dump_desc_create_dir();
/* Make sure we've got it */
if (have_dump_desc_dir && !problem_with_dump_desc_dir) {
/* Write it, and tell the main log about it */
write_str_to_file(debugfile, desc, 1);
log_info(LD_DIR,
"Unable to parse descriptor of type %s with hash %s and "
"length %lu. See file %s in data directory for details.",
type, digest_sha256_hex, (unsigned long)len,
debugfile_base);
dump_desc_fifo_add_and_clean(debugfile, digest_sha256, len);
/* Since we handed ownership over, don't free debugfile later */
debugfile = NULL;
} else {
/* Problem with the subdirectory */
log_info(LD_DIR,
"Unable to parse descriptor of type %s with hash %s and "
"length %lu. Descriptor not dumped because we had a "
"problem creating the " DESC_DUMP_DATADIR_SUBDIR
" subdirectory",
type, digest_sha256_hex, (unsigned long)len);
/* We do have to free debugfile in this case */
}
} else {
/* We already had one with this hash dumped */
log_info(LD_DIR,
"Unable to parse descriptor of type %s with hash %s and "
"length %lu. Descriptor not dumped because one with that "
"hash has already been dumped.",
type, digest_sha256_hex, (unsigned long)len);
/* We do have to free debugfile in this case */
}
} else {
/* Just log that it happened without dumping */
log_info(LD_DIR,
"Unable to parse descriptor of type %s with hash %s and "
"length %lu. Descriptor not dumped because it exceeds maximum"
" log size all by itself.",
type, digest_sha256_hex, (unsigned long)len);
/* We do have to free debugfile in this case */
}
} else {
/*
* Not logging because the sandbox is active and seccomp2 apparently
* doesn't have a sensible way to allow filenames according to a pattern
* match. (If we ever figure out how to say "allow writes to /regex/",
* remove this checK).
*/
log_info(LD_DIR,
"Unable to parse descriptor of type %s with hash %s and "
"length %lu. Descriptor not dumped because the sandbox is "
"configured",
type, digest_sha256_hex, (unsigned long)len);
}
tor_free(debugfile_base);
tor_free(debugfile);
err:
return;
}
/** Set <b>digest</b> to the SHA-1 digest of the hash of the directory in
* <b>s</b>. 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 <b>digest</b> to the SHA-1 digest of the hash of the first router in
* <b>s</b>. 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 <b>s</b>. On success, set <b>start_out</b> to the first
* character of the document, and <b>end_out</b> 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 <b>digest_out</b> to the SHA3-256 digest of the signed portion of the
* networkstatus vote in <b>s</b> -- or of the entirety of <b>s</b> 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 <b>digests</b> to all the digests of the consensus document in
* <b>s</b> */
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 <b>digest</b> to the SHA-1 digest of the hash of the <b>s_len</b>-byte
* extrainfo string at <b>s</b>. 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: used to generate signatures for routers, directories and
* network-status objects. Given a <b>digest_len</b>-byte digest in
* <b>digest</b> and a secret <b>private_key</b>, generate an PKCS1-padded
* signature, BASE64-encode it, surround it with -----BEGIN/END----- pairs,
* and return the new signature on success or NULL on failure.
*/
char *
router_get_dirobj_signature(const char *digest,
size_t digest_len,
const crypto_pk_t *private_key)
{
char *signature;
size_t i, keysize;
int siglen;
char *buf = NULL;
size_t buf_len;
/* overestimate of BEGIN/END lines total len. */
#define BEGIN_END_OVERHEAD_LEN 64
keysize = crypto_pk_keysize(private_key);
signature = tor_malloc(keysize);
siglen = crypto_pk_private_sign(private_key, signature, keysize,
digest, digest_len);
if (siglen < 0) {
log_warn(LD_BUG,"Couldn't sign digest.");
goto err;
}
/* The *2 here is a ridiculous overestimate of base-64 overhead. */
buf_len = (siglen * 2) + BEGIN_END_OVERHEAD_LEN;
buf = tor_malloc(buf_len);
if (strlcpy(buf, "-----BEGIN SIGNATURE-----\n", buf_len) >= buf_len)
goto truncated;
i = strlen(buf);
if (base64_encode(buf+i, buf_len-i, signature, siglen,
BASE64_ENCODE_MULTILINE) < 0) {
log_warn(LD_BUG,"couldn't base64-encode signature");
goto err;
}
if (strlcat(buf, "-----END SIGNATURE-----\n", buf_len) >= buf_len)
goto truncated;
tor_free(signature);
return buf;
truncated:
log_warn(LD_BUG,"tried to exceed string length.");
err:
tor_free(signature);
tor_free(buf);
return NULL;
}
/** Helper: used to generate signatures for routers, directories and
* network-status objects. Given a digest in <b>digest</b> and a secret
* <b>private_key</b>, generate a PKCS1-padded signature, BASE64-encode it,
* surround it with -----BEGIN/END----- pairs, and write it to the
* <b>buf_len</b>-byte buffer at <b>buf</b>. Return 0 on success, -1 on
* failure.
*/
int
router_append_dirobj_signature(char *buf, size_t buf_len, const char *digest,
size_t digest_len, crypto_pk_t *private_key)
{
size_t sig_len, s_len;
char *sig = router_get_dirobj_signature(digest, digest_len, private_key);
if (!sig) {
log_warn(LD_BUG, "No signature generated");
return -1;
}
sig_len = strlen(sig);
s_len = strlen(buf);
if (sig_len + s_len + 1 > buf_len) {
log_warn(LD_BUG, "Not enough room for signature");
tor_free(sig);
return -1;
}
memcpy(buf+s_len, sig, sig_len+1);
tor_free(sig);
return 0;
}
/** Return VS_RECOMMENDED if <b>myversion</b> is contained in
* <b>versionlist</b>. Else, return VS_EMPTY if versionlist has no
* entries. Else, return VS_OLD if every member of
* <b>versionlist</b> is newer than <b>myversion</b>. Else, return
* VS_NEW_IN_SERIES if there is at least one member of <b>versionlist</b> in
* the same series (major.minor.micro) as <b>myversion</b>, but no such member
* is newer than <b>myversion.</b>. Else, return VS_NEW if every member of
* <b>versionlist</b> is older than <b>myversion</b>. Else, return
* VS_UNRECOMMENDED.
*
* (versionlist is a comma-separated list of version strings,
* optionally prefixed with "Tor". Versions that can't be parsed are
* ignored.)
*/
version_status_t
tor_version_is_obsolete(const char *myversion, const char *versionlist)
{
tor_version_t mine, other;
int found_newer = 0, found_older = 0, found_newer_in_series = 0,
found_any_in_series = 0, r, same;
version_status_t ret = VS_UNRECOMMENDED;
smartlist_t *version_sl;
log_debug(LD_CONFIG,"Checking whether version '%s' is in '%s'",
myversion, versionlist);
if (tor_version_parse(myversion, &mine)) {
log_err(LD_BUG,"I couldn't parse my own version (%s)", myversion);
tor_assert(0);
}
version_sl = smartlist_new();
smartlist_split_string(version_sl, versionlist, ",", SPLIT_SKIP_SPACE, 0);
if (!strlen(versionlist)) { /* no authorities cared or agreed */
ret = VS_EMPTY;
goto done;
}
SMARTLIST_FOREACH_BEGIN(version_sl, const char *, cp) {
if (!strcmpstart(cp, "Tor "))
cp += 4;
if (tor_version_parse(cp, &other)) {
/* Couldn't parse other; it can't be a match. */
} else {
same = tor_version_same_series(&mine, &other);
if (same)
found_any_in_series = 1;
r = tor_version_compare(&mine, &other);
if (r==0) {
ret = VS_RECOMMENDED;
goto done;
} else if (r<0) {
found_newer = 1;
if (same)
found_newer_in_series = 1;
} else if (r>0) {
found_older = 1;
}
}
} SMARTLIST_FOREACH_END(cp);
/* We didn't find the listed version. Is it new or old? */
if (found_any_in_series && !found_newer_in_series && found_newer) {
ret = VS_NEW_IN_SERIES;
} else if (found_newer && !found_older) {
ret = VS_OLD;
} else if (found_older && !found_newer) {
ret = VS_NEW;
} else {
ret = VS_UNRECOMMENDED;
}
done:
SMARTLIST_FOREACH(version_sl, char *, version, tor_free(version));
smartlist_free(version_sl);
return ret;
}
MOCK_IMPL(STATIC int,
signed_digest_equals, (const uint8_t *d1, const uint8_t *d2, size_t len))
{
return tor_memeq(d1, d2, len);
}
/** Check whether the object body of the token in <b>tok</b> has a good
* signature for <b>digest</b> using key <b>pkey</b>.
* If <b>CST_NO_CHECK_OBJTYPE</b> is set, do not check
* the object type of the signature object. Use <b>doctype</b> as the type of
* the document when generating log messages. Return 0 on success, negative
* on failure.
*/
static int
check_signature_token(const char *digest,
ssize_t digest_len,
directory_token_t *tok,
crypto_pk_t *pkey,
int flags,
const char *doctype)
{
char *signed_digest;
size_t keysize;
const int check_objtype = ! (flags & CST_NO_CHECK_OBJTYPE);
tor_assert(pkey);
tor_assert(tok);
tor_assert(digest);
tor_assert(doctype);
if (check_objtype) {
if (strcmp(tok->object_type, "SIGNATURE")) {
log_warn(LD_DIR, "Bad object type on %s signature", doctype);
return -1;
}
}
keysize = crypto_pk_keysize(pkey);
signed_digest = tor_malloc(keysize);
if (crypto_pk_public_checksig(pkey, signed_digest, keysize,
tok->object_body, tok->object_size)
< digest_len) {
log_warn(LD_DIR, "Error reading %s: invalid signature.", doctype);
tor_free(signed_digest);
return -1;
}
// log_debug(LD_DIR,"Signed %s hash starts %s", doctype,
// hex_str(signed_digest,4));
if (! signed_digest_equals((const uint8_t *)digest,
(const uint8_t *)signed_digest, digest_len)) {
log_warn(LD_DIR, "Error reading %s: signature does not match.", doctype);
tor_free(signed_digest);
return -1;
}
tor_free(signed_digest);
return 0;
}
/** Helper: move *<b>s_ptr</b> 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 <b>is_extrainfo_out</b> to true if
* we found an extrainfo, or false if found a router. Do not scan beyond
* <b>eos</b>. 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 *<b>s</b> containing a concatenated sequence of router
* descriptors (or extra-info documents if <b>is_extrainfo</b> is set), parses
* them and stores the result in <b>dest</b>. 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 <b>saved_location</b> 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
* <b>invalid_digests_out</b> 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 <i>in toto</i>, 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 <b>list</b> of directory_token_t's
* with at least one argument (use GE(1) in setup). If found, store
* address and port number to <b>addr_out</b> and
* <b>port_out</b>. 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 *<b>s</b> ...
* *<b>end</b>. Mallocs a new router and returns it if all goes well, else
* returns NULL. If <b>cache_copy</b> is true, duplicate the contents of
* s through end into the signed_descriptor_body of the resulting
* routerinfo_t.
*
* If <b>end</b> is NULL, <b>s</b> must be properly NUL-terminated.
*
* If <b>allow_annotations</b>, it's okay to encounter annotations in <b>s</b>
* before the router; if it's false, reject the router if it's annotated. If
* <b>prepend_annotations</b> 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 <b>can_dl_again_out</b> is provided, set *<b>can_dl_again_out</b> 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;
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->onion_pkey = tok->key;
tok->key = NULL; /* Prevent free */
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;
}
if (check_tap_onion_key_crosscert(
(const uint8_t*)cc_tap_tok->object_body,
(int)cc_tap_tok->object_size,
router->onion_pkey,
&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;i<tok->n_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("<unknown>");
}
goto done;
err:
dump_desc(s_dup, "router descriptor");
routerinfo_free(router);
router = NULL;
done:
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 <b>s</b>, ending at
* <b>end</b>. (If <b>end</b> is NULL, parse up to the end of <b>s</b>.) If
* <b>cache_copy</b> is true, make a copy of the extra-info document in the
* cache_info fields of the result. If <b>routermap</b> is provided, use it
* as a map from router identity to routerinfo_t when looking up signing keys.
*
* If <b>can_dl_again_out</b> is provided, set *<b>can_dl_again_out</b> 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;
}
/** Parse a key certificate from <b>s</b>; point <b>end-of-string</b> to
* the first character after the certificate. */
authority_cert_t *
authority_cert_parse_from_string(const char *s, const char **end_of_string)
{
/** Reject any certificate at least this big; it is probably an overflow, an
* attack, a bug, or some other nonsense. */
#define MAX_CERT_SIZE (128*1024)
authority_cert_t *cert = NULL, *old_cert;
smartlist_t *tokens = NULL;
char digest[DIGEST_LEN];
directory_token_t *tok;
char fp_declared[DIGEST_LEN];
char *eos;
size_t len;
int found;
memarea_t *area = NULL;
const char *s_dup = s;
s = eat_whitespace(s);
eos = strstr(s, "\ndir-key-certification");
if (! eos) {
log_warn(LD_DIR, "No signature found on key certificate");
return NULL;
}
eos = strstr(eos, "\n-----END SIGNATURE-----\n");
if (! eos) {
log_warn(LD_DIR, "No end-of-signature found on key certificate");
return NULL;
}
eos = strchr(eos+2, '\n');
tor_assert(eos);
++eos;
len = eos - s;
if (len > MAX_CERT_SIZE) {
log_warn(LD_DIR, "Certificate is far too big (at %lu bytes long); "
"rejecting", (unsigned long)len);
return NULL;
}
tokens = smartlist_new();
area = memarea_new();
if (tokenize_string(area,s, eos, tokens, dir_key_certificate_table, 0) < 0) {
log_warn(LD_DIR, "Error tokenizing key certificate");
goto err;
}
if (router_get_hash_impl(s, strlen(s), digest, "dir-key-certificate-version",
"\ndir-key-certification", '\n', DIGEST_SHA1) < 0)
goto err;
tok = smartlist_get(tokens, 0);
if (tok->tp != K_DIR_KEY_CERTIFICATE_VERSION || strcmp(tok->args[0], "3")) {
log_warn(LD_DIR,
"Key certificate does not begin with a recognized version (3).");
goto err;
}
cert = tor_malloc_zero(sizeof(authority_cert_t));
memcpy(cert->cache_info.signed_descriptor_digest, digest, DIGEST_LEN);
tok = find_by_keyword(tokens, K_DIR_SIGNING_KEY);
tor_assert(tok->key);
cert->signing_key = tok->key;
tok->key = NULL;
if (crypto_pk_get_digest(cert->signing_key, cert->signing_key_digest))
goto err;
tok = find_by_keyword(tokens, K_DIR_IDENTITY_KEY);
tor_assert(tok->key);
cert->identity_key = tok->key;
tok->key = NULL;
tok = find_by_keyword(tokens, K_FINGERPRINT);
tor_assert(tok->n_args);
if (base16_decode(fp_declared, DIGEST_LEN, tok->args[0],
strlen(tok->args[0])) != DIGEST_LEN) {
log_warn(LD_DIR, "Couldn't decode key certificate fingerprint %s",
escaped(tok->args[0]));
goto err;
}
if (crypto_pk_get_digest(cert->identity_key,
cert->cache_info.identity_digest))
goto err;
if (tor_memneq(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) {
log_warn(LD_DIR, "Digest of certificate key didn't match declared "
"fingerprint");
goto err;
}
tok = find_opt_by_keyword(tokens, K_DIR_ADDRESS);
if (tok) {
struct in_addr in;
char *address = NULL;
tor_assert(tok->n_args);
/* XXX++ use some tor_addr parse function below instead. -RD */
if (tor_addr_port_split(LOG_WARN, tok->args[0], &address,
&cert->dir_port) < 0 ||
tor_inet_aton(address, &in) == 0) {
log_warn(LD_DIR, "Couldn't parse dir-address in certificate");
tor_free(address);
goto err;
}
cert->addr = ntohl(in.s_addr);
tor_free(address);
}
tok = find_by_keyword(tokens, K_DIR_KEY_PUBLISHED);
if (parse_iso_time(tok->args[0], &cert->cache_info.published_on) < 0) {
goto err;
}
tok = find_by_keyword(tokens, K_DIR_KEY_EXPIRES);
if (parse_iso_time(tok->args[0], &cert->expires) < 0) {
goto err;
}
tok = smartlist_get(tokens, smartlist_len(tokens)-1);
if (tok->tp != K_DIR_KEY_CERTIFICATION) {
log_warn(LD_DIR, "Certificate didn't end with dir-key-certification.");
goto err;
}
/* If we already have this cert, don't bother checking the signature. */
old_cert = authority_cert_get_by_digests(
cert->cache_info.identity_digest,
cert->signing_key_digest);
found = 0;
if (old_cert) {
/* XXXX We could just compare signed_descriptor_digest, but that wouldn't
* buy us much. */
if (old_cert->cache_info.signed_descriptor_len == len &&
old_cert->cache_info.signed_descriptor_body &&
tor_memeq(s, old_cert->cache_info.signed_descriptor_body, len)) {
log_debug(LD_DIR, "We already checked the signature on this "
"certificate; no need to do so again.");
found = 1;
}
}
if (!found) {
if (check_signature_token(digest, DIGEST_LEN, tok, cert->identity_key, 0,
"key certificate")) {
goto err;
}
tok = find_by_keyword(tokens, K_DIR_KEY_CROSSCERT);
if (check_signature_token(cert->cache_info.identity_digest,
DIGEST_LEN,
tok,
cert->signing_key,
CST_NO_CHECK_OBJTYPE,
"key cross-certification")) {
goto err;
}
}
cert->cache_info.signed_descriptor_len = len;
cert->cache_info.signed_descriptor_body = tor_malloc(len+1);
memcpy(cert->cache_info.signed_descriptor_body, s, len);
cert->cache_info.signed_descriptor_body[len] = 0;
cert->cache_info.saved_location = SAVED_NOWHERE;
if (end_of_string) {
*end_of_string = eat_whitespace(eos);
}
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
if (area) {
DUMP_AREA(area, "authority cert");
memarea_drop_all(area);
}
return cert;
err:
dump_desc(s_dup, "authority cert");
authority_cert_free(cert);
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
if (area) {
DUMP_AREA(area, "authority cert");
memarea_drop_all(area);
}
return NULL;
}
/** Helper: given a string <b>s</b>, 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 <b>vote</b> or <b>vote_rs</b> 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 <b>protocols</b> into <b>out</b>,
* falling back or correcting them based on <b>version</b> 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 *<b>s</b>, containing a routerstatus object, and an
* empty smartlist at <b>tokens</b>, parse and return the first router status
* object in the string, and advance *<b>s</b> to just after the end of the
* router status. Return NULL and advance *<b>s</b> on error.
*
* If <b>vote</b> and <b>vote_rs</b> are provided, don't allocate a fresh
* routerstatus but use <b>vote_rs</b> instead.
*
* If <b>consensus_method</b> 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 <b>flav</b>.
**/
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 |= (U64_LITERAL(1)<<p);
} else {
log_warn(LD_DIR, "Flags line had a flag %s not listed in known_flags.",
escaped(tok->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 != "I64_FORMAT,
Wmm, I64_PRINTF_ARG(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 != "I64_FORMAT" - Wmg=%f", Wgg,
I64_PRINTF_ARG(weight_scale), Wmg);
valid = 0;
}
if (fabs(Wee + Wme - weight_scale) > 0.001*weight_scale) {
log_warn(LD_BUG, "Wee=%f != "I64_FORMAT" - Wme=%f", Wee,
I64_PRINTF_ARG(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 != "I64_FORMAT,
Wgd, Wmd, Wed, I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Mtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Mtotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Rtotal, Stotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 "
I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT
" D="I64_FORMAT" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Rtotal*3, I64_PRINTF_ARG(T),
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 "
I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT
" D="I64_FORMAT" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Stotal*3, I64_PRINTF_ARG(T),
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 "
I64_FORMAT". "
"G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Mtotal*3, I64_PRINTF_ARG(T),
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Mtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Mtotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 "
I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT
" D="I64_FORMAT" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Stotal*3, I64_PRINTF_ARG(T),
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, NStotal, Mtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 "
I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT
" E="I64_FORMAT" D="I64_FORMAT" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, NStotal*3, I64_PRINTF_ARG(T),
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Mtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Etotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
" T="I64_FORMAT". "
"Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f",
casename, Mtotal, Gtotal,
I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E),
I64_PRINTF_ARG(D), I64_PRINTF_ARG(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 <b>srv_type</b> is in
* <b>tokens</b>. If there is, parse it and set it to <b>srv_out</b>. 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 <b>tokens</b> and place them in
* the networkstatus <b>ns</b>. */
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 <b>s</b>, 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<<flagnum to do a
* bit-shift. This is only for votes and opinions: consensus users don't
* care about flags they don't recognize, and so don't build a bitfield
* for them. */
log_warn(LD_DIR, "Too many known-flags in consensus vote or opinion");
goto err;
}
tok = find_opt_by_keyword(tokens, K_PARAMS);
if (tok) {
int any_dups = 0;
inorder = 1;
ns->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
* <b>flavor_name</b>-flavored networkstatus according to the detached
* signatures document <b>sigs</b>, 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 <b>flavor_name</b>-flavored
* networkstatus according to the detached signatures document <b>sigs</b>,
* 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 <b>s</b> and
* <b>eos</b> 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 <b>s</b> 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 *<b>malformed_list</b> 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 <b>tok</b> to the router info in
* <b>router</b>. 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 <b>t</b> 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
* <b>s</b>.
*/
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;
}
/** Helper function for <b>router_get_hash_impl</b>: given <b>s</b>,
* <b>s_len</b>, <b>start_str</b>, <b>end_str</b>, and <b>end_c</b> with the
* same semantics as in that function, set *<b>start_out</b> (inclusive) and
* *<b>end_out</b> (exclusive) to the boundaries of the string to be hashed.
*
* Return 0 on success and -1 on failure.
*/
static int
router_get_hash_impl_helper(const char *s, size_t s_len,
const char *start_str,
const char *end_str, char end_c,
int log_severity,
const char **start_out, const char **end_out)
{
const char *start, *end;
start = tor_memstr(s, s_len, start_str);
if (!start) {
log_fn(log_severity,LD_DIR,
"couldn't find start of hashed material \"%s\"",start_str);
return -1;
}
if (start != s && *(start-1) != '\n') {
log_fn(log_severity,LD_DIR,
"first occurrence of \"%s\" is not at the start of a line",
start_str);
return -1;
}
end = tor_memstr(start+strlen(start_str),
s_len - (start-s) - strlen(start_str), end_str);
if (!end) {
log_fn(log_severity,LD_DIR,
"couldn't find end of hashed material \"%s\"",end_str);
return -1;
}
end = memchr(end+strlen(end_str), end_c, s_len - (end-s) - strlen(end_str));
if (!end) {
log_fn(log_severity,LD_DIR,
"couldn't find EOL");
return -1;
}
++end;
*start_out = start;
*end_out = end;
return 0;
}
/** Compute the digest of the substring of <b>s</b> taken from the first
* occurrence of <b>start_str</b> through the first instance of c after the
* first subsequent occurrence of <b>end_str</b>; store the 20-byte or 32-byte
* result in <b>digest</b>; return 0 on success.
*
* If no such substring exists, return -1.
*/
static int
router_get_hash_impl(const char *s, size_t s_len, char *digest,
const char *start_str,
const char *end_str, char end_c,
digest_algorithm_t alg)
{
const char *start=NULL, *end=NULL;
if (router_get_hash_impl_helper(s,s_len,start_str,end_str,end_c,LOG_WARN,
&start,&end)<0)
return -1;
return router_compute_hash_final(digest, start, end-start, alg);
}
/** Compute the digest of the <b>len</b>-byte directory object at
* <b>start</b>, using <b>alg</b>. Store the result in <b>digest</b>, which
* must be long enough to hold it. */
MOCK_IMPL(STATIC int,
router_compute_hash_final,(char *digest,
const char *start, size_t len,
digest_algorithm_t alg))
{
if (alg == DIGEST_SHA1) {
if (crypto_digest(digest, start, len) < 0) {
log_warn(LD_BUG,"couldn't compute digest");
return -1;
}
} else {
if (crypto_digest256(digest, start, len, alg) < 0) {
log_warn(LD_BUG,"couldn't compute digest");
return -1;
}
}
return 0;
}
/** As router_get_hash_impl, but compute all hashes. */
static int
router_get_hashes_impl(const char *s, size_t s_len, common_digests_t *digests,
const char *start_str,
const char *end_str, char end_c)
{
const char *start=NULL, *end=NULL;
if (router_get_hash_impl_helper(s,s_len,start_str,end_str,end_c,LOG_WARN,
&start,&end)<0)
return -1;
if (crypto_common_digests(digests, start, end-start)) {
log_warn(LD_BUG,"couldn't compute digests");
return -1;
}
return 0;
}
/** 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
* <b>s</b> and ending at <b>eos</b>. If allow_annotations is set, read any
* annotations we recognize and ignore ones we don't.
*
* If <b>saved_location</b> 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 <b>invalid_disgests_out</b> 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;
}
md->onion_pkey = tok->key;
tok->key = NULL;
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;i<tok->n_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;
}
/** Extract a Tor version from a <b>platform</b> line from a router
* descriptor, and place the result in <b>router_version</b>.
*
* Return 1 on success, -1 on parsing failure, and 0 if the
* platform line does not indicate some version of Tor.
*
* If <b>strict</b> is non-zero, finding any weird version components
* (like negative numbers) counts as a parsing failure.
*/
int
tor_version_parse_platform(const char *platform,
tor_version_t *router_version,
int strict)
{
char tmp[128];
char *s, *s2, *start;
if (strcmpstart(platform,"Tor ")) /* nonstandard Tor; say 0. */
return 0;
start = (char *)eat_whitespace(platform+3);
if (!*start) return -1;
s = (char *)find_whitespace(start); /* also finds '\0', which is fine */
s2 = (char*)eat_whitespace(s);
if (!strcmpstart(s2, "(r") || !strcmpstart(s2, "(git-"))
s = (char*)find_whitespace(s2);
if ((size_t)(s-start+1) >= sizeof(tmp)) /* too big, no */
return -1;
strlcpy(tmp, start, s-start+1);
if (tor_version_parse(tmp, router_version)<0) {
log_info(LD_DIR,"Router version '%s' unparseable.",tmp);
return -1;
}
if (strict) {
if (router_version->major < 0 ||
router_version->minor < 0 ||
router_version->micro < 0 ||
router_version->patchlevel < 0 ||
router_version->svn_revision < 0) {
return -1;
}
}
return 1;
}
/** Parse the Tor version of the platform string <b>platform</b>,
* and compare it to the version in <b>cutoff</b>. Return 1 if
* the router is at least as new as the cutoff, else return 0.
*/
int
tor_version_as_new_as(const char *platform, const char *cutoff)
{
tor_version_t cutoff_version, router_version;
int r;
tor_assert(platform);
if (tor_version_parse(cutoff, &cutoff_version)<0) {
log_warn(LD_BUG,"cutoff version '%s' unparseable.",cutoff);
return 0;
}
r = tor_version_parse_platform(platform, &router_version, 0);
if (r == 0) {
/* nonstandard Tor; be safe and say yes */
return 1;
} else if (r < 0) {
/* unparseable version; be safe and say yes. */
return 1;
}
/* Here's why we don't need to do any special handling for svn revisions:
* - If neither has an svn revision, we're fine.
* - If the router doesn't have an svn revision, we can't assume that it
* is "at least" any svn revision, so we need to return 0.
* - If the target version doesn't have an svn revision, any svn revision
* (or none at all) is good enough, so return 1.
* - If both target and router have an svn revision, we compare them.
*/
return tor_version_compare(&router_version, &cutoff_version) >= 0;
}
/** Parse a tor version from <b>s</b>, and store the result in <b>out</b>.
* Return 0 on success, -1 on failure. */
int
tor_version_parse(const char *s, tor_version_t *out)
{
char *eos=NULL;
const char *cp=NULL;
int ok = 1;
/* Format is:
* "Tor " ? NUM dot NUM [ dot NUM [ ( pre | rc | dot ) NUM ] ] [ - tag ]
*/
tor_assert(s);
tor_assert(out);
memset(out, 0, sizeof(tor_version_t));
out->status = VER_RELEASE;
if (!strcasecmpstart(s, "Tor "))
s += 4;
cp = s;
#define NUMBER(m) \
do { \
if (!cp || *cp < '0' || *cp > '9') \
return -1; \
out->m = (int)tor_parse_uint64(cp, 10, 0, INT32_MAX, &ok, &eos); \
if (!ok) \
return -1; \
if (!eos || eos == cp) \
return -1; \
cp = eos; \
} while (0)
#define DOT() \
do { \
if (*cp != '.') \
return -1; \
++cp; \
} while (0)
NUMBER(major);
DOT();
NUMBER(minor);
if (*cp == 0)
return 0;
else if (*cp == '-')
goto status_tag;
DOT();
NUMBER(micro);
/* Get status */
if (*cp == 0) {
return 0;
} else if (*cp == '.') {
++cp;
} else if (*cp == '-') {
goto status_tag;
} else if (0==strncmp(cp, "pre", 3)) {
out->status = VER_PRE;
cp += 3;
} else if (0==strncmp(cp, "rc", 2)) {
out->status = VER_RC;
cp += 2;
} else {
return -1;
}
NUMBER(patchlevel);
status_tag:
/* Get status tag. */
if (*cp == '-' || *cp == '.')
++cp;
eos = (char*) find_whitespace(cp);
if (eos-cp >= (int)sizeof(out->status_tag))
strlcpy(out->status_tag, cp, sizeof(out->status_tag));
else {
memcpy(out->status_tag, cp, eos-cp);
out->status_tag[eos-cp] = 0;
}
cp = eat_whitespace(eos);
if (!strcmpstart(cp, "(r")) {
cp += 2;
out->svn_revision = (int) strtol(cp,&eos,10);
} else if (!strcmpstart(cp, "(git-")) {
char *close_paren = strchr(cp, ')');
int hexlen;
char digest[DIGEST_LEN];
if (! close_paren)
return -1;
cp += 5;
if (close_paren-cp > HEX_DIGEST_LEN)
return -1;
hexlen = (int)(close_paren-cp);
memwipe(digest, 0, sizeof(digest));
if ( hexlen == 0 || (hexlen % 2) == 1)
return -1;
if (base16_decode(digest, hexlen/2, cp, hexlen) != hexlen/2)
return -1;
memcpy(out->git_tag, digest, hexlen/2);
out->git_tag_len = hexlen/2;
}
return 0;
#undef NUMBER
#undef DOT
}
/** Compare two tor versions; Return <0 if a < b; 0 if a ==b, >0 if a >
* b. */
int
tor_version_compare(tor_version_t *a, tor_version_t *b)
{
int i;
tor_assert(a);
tor_assert(b);
/* We take this approach to comparison to ensure the same (bogus!) behavior
* on all inputs as we would have seen before bug #21278 was fixed. The
* only important difference here is that this method doesn't cause
* a signed integer underflow.
*/
#define CMP(field) do { \
unsigned aval = (unsigned) a->field; \
unsigned bval = (unsigned) b->field; \
int result = (int) (aval - bval); \
if (result < 0) \
return -1; \
else if (result > 0) \
return 1; \
} while (0)
CMP(major);
CMP(minor);
CMP(micro);
CMP(status);
CMP(patchlevel);
if ((i = strcmp(a->status_tag, b->status_tag)))
return i;
CMP(svn_revision);
CMP(git_tag_len);
if (a->git_tag_len)
return fast_memcmp(a->git_tag, b->git_tag, a->git_tag_len);
else
return 0;
#undef CMP
}
/** Return true iff versions <b>a</b> and <b>b</b> belong to the same series.
*/
int
tor_version_same_series(tor_version_t *a, tor_version_t *b)
{
tor_assert(a);
tor_assert(b);
return ((a->major == b->major) &&
(a->minor == b->minor) &&
(a->micro == b->micro));
}
/** Helper: Given pointers to two strings describing tor versions, return -1
* if _a precedes _b, 1 if _b precedes _a, and 0 if they are equivalent.
* Used to sort a list of versions. */
static int
compare_tor_version_str_ptr_(const void **_a, const void **_b)
{
const char *a = *_a, *b = *_b;
int ca, cb;
tor_version_t va, vb;
ca = tor_version_parse(a, &va);
cb = tor_version_parse(b, &vb);
/* If they both parse, compare them. */
if (!ca && !cb)
return tor_version_compare(&va,&vb);
/* If one parses, it comes first. */
if (!ca && cb)
return -1;
if (ca && !cb)
return 1;
/* If neither parses, compare strings. Also, the directory server admin
** needs to be smacked upside the head. But Tor is tolerant and gentle. */
return strcmp(a,b);
}
/** Sort a list of string-representations of versions in ascending order. */
void
sort_version_list(smartlist_t *versions, int remove_duplicates)
{
smartlist_sort(versions, compare_tor_version_str_ptr_);
if (remove_duplicates)
smartlist_uniq(versions, compare_tor_version_str_ptr_, tor_free_);
}
/** Parse and validate the ASCII-encoded v2 descriptor in <b>desc</b>,
* write the parsed descriptor to the newly allocated *<b>parsed_out</b>, the
* binary descriptor ID of length DIGEST_LEN to <b>desc_id_out</b>, the
* encrypted introduction points to the newly allocated
* *<b>intro_points_encrypted_out</b>, their encrypted size to
* *<b>intro_points_encrypted_size_out</b>, the size of the encoded descriptor
* to *<b>encoded_size_out</b>, and a pointer to the possibly next
* descriptor to *<b>next_out</b>; return 0 for success (including validation)
* and -1 for failure.
*
* If <b>as_hsdir</b> is 1, we're parsing this as an HSDir, and we should
* be strict about time formats.
*/
int
rend_parse_v2_service_descriptor(rend_service_descriptor_t **parsed_out,
char *desc_id_out,
char **intro_points_encrypted_out,
size_t *intro_points_encrypted_size_out,
size_t *encoded_size_out,
const char **next_out, const char *desc,
int as_hsdir)
{
rend_service_descriptor_t *result =
tor_malloc_zero(sizeof(rend_service_descriptor_t));
char desc_hash[DIGEST_LEN];
const char *eos;
smartlist_t *tokens = smartlist_new();
directory_token_t *tok;
char secret_id_part[DIGEST_LEN];
int i, version, num_ok=1;
smartlist_t *versions;
char public_key_hash[DIGEST_LEN];
char test_desc_id[DIGEST_LEN];
memarea_t *area = NULL;
const int strict_time_fmt = as_hsdir;
tor_assert(desc);
/* Check if desc starts correctly. */
if (strncmp(desc, "rendezvous-service-descriptor ",
strlen("rendezvous-service-descriptor "))) {
log_info(LD_REND, "Descriptor does not start correctly.");
goto err;
}
/* Compute descriptor hash for later validation. */
if (router_get_hash_impl(desc, strlen(desc), desc_hash,
"rendezvous-service-descriptor ",
"\nsignature", '\n', DIGEST_SHA1) < 0) {
log_warn(LD_REND, "Couldn't compute descriptor hash.");
goto err;
}
/* Determine end of string. */
eos = strstr(desc, "\nrendezvous-service-descriptor ");
if (!eos)
eos = desc + strlen(desc);
else
eos = eos + 1;
/* Check length. */
if (eos-desc > REND_DESC_MAX_SIZE) {
/* XXXX+ If we are parsing this descriptor as a server, this
* should be a protocol warning. */
log_warn(LD_REND, "Descriptor length is %d which exceeds "
"maximum rendezvous descriptor size of %d bytes.",
(int)(eos-desc), REND_DESC_MAX_SIZE);
goto err;
}
/* Tokenize descriptor. */
area = memarea_new();
if (tokenize_string(area, desc, eos, tokens, desc_token_table, 0)) {
log_warn(LD_REND, "Error tokenizing descriptor.");
goto err;
}
/* Set next to next descriptor, if available. */
*next_out = eos;
/* Set length of encoded descriptor. */
*encoded_size_out = eos - desc;
/* Check min allowed length of token list. */
if (smartlist_len(tokens) < 7) {
log_warn(LD_REND, "Impossibly short descriptor.");
goto err;
}
/* Parse base32-encoded descriptor ID. */
tok = find_by_keyword(tokens, R_RENDEZVOUS_SERVICE_DESCRIPTOR);
tor_assert(tok == smartlist_get(tokens, 0));
tor_assert(tok->n_args == 1);
if (!rend_valid_descriptor_id(tok->args[0])) {
log_warn(LD_REND, "Invalid descriptor ID: '%s'", tok->args[0]);
goto err;
}
if (base32_decode(desc_id_out, DIGEST_LEN,
tok->args[0], REND_DESC_ID_V2_LEN_BASE32) < 0) {
log_warn(LD_REND, "Descriptor ID contains illegal characters: %s",
tok->args[0]);
goto err;
}
/* Parse descriptor version. */
tok = find_by_keyword(tokens, R_VERSION);
tor_assert(tok->n_args == 1);
result->version =
(int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &num_ok, NULL);
if (result->version != 2 || !num_ok) {
/* If it's <2, it shouldn't be under this format. If the number
* is greater than 2, we bumped it because we broke backward
* compatibility. See how version numbers in our other formats
* work. */
log_warn(LD_REND, "Unrecognized descriptor version: %s",
escaped(tok->args[0]));
goto err;
}
/* Parse public key. */
tok = find_by_keyword(tokens, R_PERMANENT_KEY);
result->pk = tok->key;
tok->key = NULL; /* Prevent free */
/* Parse secret ID part. */
tok = find_by_keyword(tokens, R_SECRET_ID_PART);
tor_assert(tok->n_args == 1);
if (strlen(tok->args[0]) != REND_SECRET_ID_PART_LEN_BASE32 ||
strspn(tok->args[0], BASE32_CHARS) != REND_SECRET_ID_PART_LEN_BASE32) {
log_warn(LD_REND, "Invalid secret ID part: '%s'", tok->args[0]);
goto err;
}
if (base32_decode(secret_id_part, DIGEST_LEN, tok->args[0], 32) < 0) {
log_warn(LD_REND, "Secret ID part contains illegal characters: %s",
tok->args[0]);
goto err;
}
/* Parse publication time -- up-to-date check is done when storing the
* descriptor. */
tok = find_by_keyword(tokens, R_PUBLICATION_TIME);
tor_assert(tok->n_args == 1);
if (parse_iso_time_(tok->args[0], &result->timestamp,
strict_time_fmt, 0) < 0) {
log_warn(LD_REND, "Invalid publication time: '%s'", tok->args[0]);
goto err;
}
/* Parse protocol versions. */
tok = find_by_keyword(tokens, R_PROTOCOL_VERSIONS);
tor_assert(tok->n_args == 1);
versions = smartlist_new();
smartlist_split_string(versions, tok->args[0], ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
for (i = 0; i < smartlist_len(versions); i++) {
version = (int) tor_parse_long(smartlist_get(versions, i),
10, 0, INT_MAX, &num_ok, NULL);
if (!num_ok) /* It's a string; let's ignore it. */
continue;
if (version >= REND_PROTOCOL_VERSION_BITMASK_WIDTH)
/* Avoid undefined left-shift behaviour. */
continue;
result->protocols |= 1 << version;
}
SMARTLIST_FOREACH(versions, char *, cp, tor_free(cp));
smartlist_free(versions);
/* Parse encrypted introduction points. Don't verify. */
tok = find_opt_by_keyword(tokens, R_INTRODUCTION_POINTS);
if (tok) {
if (strcmp(tok->object_type, "MESSAGE")) {
log_warn(LD_DIR, "Bad object type: introduction points should be of "
"type MESSAGE");
goto err;
}
*intro_points_encrypted_out = tor_memdup(tok->object_body,
tok->object_size);
*intro_points_encrypted_size_out = tok->object_size;
} else {
*intro_points_encrypted_out = NULL;
*intro_points_encrypted_size_out = 0;
}
/* Parse and verify signature. */
tok = find_by_keyword(tokens, R_SIGNATURE);
if (check_signature_token(desc_hash, DIGEST_LEN, tok, result->pk, 0,
"v2 rendezvous service descriptor") < 0)
goto err;
/* Verify that descriptor ID belongs to public key and secret ID part. */
if (crypto_pk_get_digest(result->pk, public_key_hash) < 0) {
log_warn(LD_REND, "Unable to compute rend descriptor public key digest");
goto err;
}
rend_get_descriptor_id_bytes(test_desc_id, public_key_hash,
secret_id_part);
if (tor_memneq(desc_id_out, test_desc_id, DIGEST_LEN)) {
log_warn(LD_REND, "Parsed descriptor ID does not match "
"computed descriptor ID.");
goto err;
}
goto done;
err:
rend_service_descriptor_free(result);
result = NULL;
done:
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
}
if (area)
memarea_drop_all(area);
*parsed_out = result;
if (result)
return 0;
return -1;
}
/** Decrypt the encrypted introduction points in <b>ipos_encrypted</b> of
* length <b>ipos_encrypted_size</b> using <b>descriptor_cookie</b> and
* write the result to a newly allocated string that is pointed to by
* <b>ipos_decrypted</b> and its length to <b>ipos_decrypted_size</b>.
* Return 0 if decryption was successful and -1 otherwise. */
int
rend_decrypt_introduction_points(char **ipos_decrypted,
size_t *ipos_decrypted_size,
const char *descriptor_cookie,
const char *ipos_encrypted,
size_t ipos_encrypted_size)
{
tor_assert(ipos_encrypted);
tor_assert(descriptor_cookie);
if (ipos_encrypted_size < 2) {
log_warn(LD_REND, "Size of encrypted introduction points is too "
"small.");
return -1;
}
if (ipos_encrypted[0] == (int)REND_BASIC_AUTH) {
char iv[CIPHER_IV_LEN], client_id[REND_BASIC_AUTH_CLIENT_ID_LEN],
session_key[CIPHER_KEY_LEN], *dec;
int declen, client_blocks;
size_t pos = 0, len, client_entries_len;
crypto_digest_t *digest;
crypto_cipher_t *cipher;
client_blocks = (int) ipos_encrypted[1];
client_entries_len = client_blocks * REND_BASIC_AUTH_CLIENT_MULTIPLE *
REND_BASIC_AUTH_CLIENT_ENTRY_LEN;
if (ipos_encrypted_size < 2 + client_entries_len + CIPHER_IV_LEN + 1) {
log_warn(LD_REND, "Size of encrypted introduction points is too "
"small.");
return -1;
}
memcpy(iv, ipos_encrypted + 2 + client_entries_len, CIPHER_IV_LEN);
digest = crypto_digest_new();
crypto_digest_add_bytes(digest, descriptor_cookie, REND_DESC_COOKIE_LEN);
crypto_digest_add_bytes(digest, iv, CIPHER_IV_LEN);
crypto_digest_get_digest(digest, client_id,
REND_BASIC_AUTH_CLIENT_ID_LEN);
crypto_digest_free(digest);
for (pos = 2; pos < 2 + client_entries_len;
pos += REND_BASIC_AUTH_CLIENT_ENTRY_LEN) {
if (tor_memeq(ipos_encrypted + pos, client_id,
REND_BASIC_AUTH_CLIENT_ID_LEN)) {
/* Attempt to decrypt introduction points. */
cipher = crypto_cipher_new(descriptor_cookie);
if (crypto_cipher_decrypt(cipher, session_key, ipos_encrypted
+ pos + REND_BASIC_AUTH_CLIENT_ID_LEN,
CIPHER_KEY_LEN) < 0) {
log_warn(LD_REND, "Could not decrypt session key for client.");
crypto_cipher_free(cipher);
return -1;
}
crypto_cipher_free(cipher);
len = ipos_encrypted_size - 2 - client_entries_len - CIPHER_IV_LEN;
dec = tor_malloc_zero(len + 1);
declen = crypto_cipher_decrypt_with_iv(session_key, dec, len,
ipos_encrypted + 2 + client_entries_len,
ipos_encrypted_size - 2 - client_entries_len);
if (declen < 0) {
log_warn(LD_REND, "Could not decrypt introduction point string.");
tor_free(dec);
return -1;
}
if (fast_memcmpstart(dec, declen, "introduction-point ")) {
log_warn(LD_REND, "Decrypted introduction points don't "
"look like we could parse them.");
tor_free(dec);
continue;
}
*ipos_decrypted = dec;
*ipos_decrypted_size = declen;
return 0;
}
}
log_warn(LD_REND, "Could not decrypt introduction points. Please "
"check your authorization for this service!");
return -1;
} else if (ipos_encrypted[0] == (int)REND_STEALTH_AUTH) {
char *dec;
int declen;
if (ipos_encrypted_size < CIPHER_IV_LEN + 2) {
log_warn(LD_REND, "Size of encrypted introduction points is too "
"small.");
return -1;
}
dec = tor_malloc_zero(ipos_encrypted_size - CIPHER_IV_LEN - 1 + 1);
declen = crypto_cipher_decrypt_with_iv(descriptor_cookie, dec,
ipos_encrypted_size -
CIPHER_IV_LEN - 1,
ipos_encrypted + 1,
ipos_encrypted_size - 1);
if (declen < 0) {
log_warn(LD_REND, "Decrypting introduction points failed!");
tor_free(dec);
return -1;
}
*ipos_decrypted = dec;
*ipos_decrypted_size = declen;
return 0;
} else {
log_warn(LD_REND, "Unknown authorization type number: %d",
ipos_encrypted[0]);
return -1;
}
}
/** Parse the encoded introduction points in <b>intro_points_encoded</b> of
* length <b>intro_points_encoded_size</b> and write the result to the
* descriptor in <b>parsed</b>; return the number of successfully parsed
* introduction points or -1 in case of a failure. */
int
rend_parse_introduction_points(rend_service_descriptor_t *parsed,
const char *intro_points_encoded,
size_t intro_points_encoded_size)
{
const char *current_ipo, *end_of_intro_points;
smartlist_t *tokens = NULL;
directory_token_t *tok;
rend_intro_point_t *intro;
extend_info_t *info;
int result, num_ok=1;
memarea_t *area = NULL;
tor_assert(parsed);
/** Function may only be invoked once. */
tor_assert(!parsed->intro_nodes);
if (!intro_points_encoded || intro_points_encoded_size == 0) {
log_warn(LD_REND, "Empty or zero size introduction point list");
goto err;
}
/* Consider one intro point after the other. */
current_ipo = intro_points_encoded;
end_of_intro_points = intro_points_encoded + intro_points_encoded_size;
tokens = smartlist_new();
parsed->intro_nodes = smartlist_new();
area = memarea_new();
while (!fast_memcmpstart(current_ipo, end_of_intro_points-current_ipo,
"introduction-point ")) {
/* Determine end of string. */
const char *eos = tor_memstr(current_ipo, end_of_intro_points-current_ipo,
"\nintroduction-point ");
if (!eos)
eos = end_of_intro_points;
else
eos = eos+1;
tor_assert(eos <= intro_points_encoded+intro_points_encoded_size);
/* Free tokens and clear token list. */
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_clear(tokens);
memarea_clear(area);
/* Tokenize string. */
if (tokenize_string(area, current_ipo, eos, tokens, ipo_token_table, 0)) {
log_warn(LD_REND, "Error tokenizing introduction point");
goto err;
}
/* Advance to next introduction point, if available. */
current_ipo = eos;
/* Check minimum allowed length of introduction point. */
if (smartlist_len(tokens) < 5) {
log_warn(LD_REND, "Impossibly short introduction point.");
goto err;
}
/* Allocate new intro point and extend info. */
intro = tor_malloc_zero(sizeof(rend_intro_point_t));
info = intro->extend_info = tor_malloc_zero(sizeof(extend_info_t));
/* Parse identifier. */
tok = find_by_keyword(tokens, R_IPO_IDENTIFIER);
if (base32_decode(info->identity_digest, DIGEST_LEN,
tok->args[0], REND_INTRO_POINT_ID_LEN_BASE32) < 0) {
log_warn(LD_REND, "Identity digest contains illegal characters: %s",
tok->args[0]);
rend_intro_point_free(intro);
goto err;
}
/* Write identifier to nickname. */
info->nickname[0] = '$';
base16_encode(info->nickname + 1, sizeof(info->nickname) - 1,
info->identity_digest, DIGEST_LEN);
/* Parse IP address. */
tok = find_by_keyword(tokens, R_IPO_IP_ADDRESS);
if (tor_addr_parse(&info->addr, tok->args[0])<0) {
log_warn(LD_REND, "Could not parse introduction point address.");
rend_intro_point_free(intro);
goto err;
}
if (tor_addr_family(&info->addr) != AF_INET) {
log_warn(LD_REND, "Introduction point address was not ipv4.");
rend_intro_point_free(intro);
goto err;
}
/* Parse onion port. */
tok = find_by_keyword(tokens, R_IPO_ONION_PORT);
info->port = (uint16_t) tor_parse_long(tok->args[0],10,1,65535,
&num_ok,NULL);
if (!info->port || !num_ok) {
log_warn(LD_REND, "Introduction point onion port %s is invalid",
escaped(tok->args[0]));
rend_intro_point_free(intro);
goto err;
}
/* Parse onion key. */
tok = find_by_keyword(tokens, R_IPO_ONION_KEY);
if (!crypto_pk_public_exponent_ok(tok->key)) {
log_warn(LD_REND,
"Introduction point's onion key had invalid exponent.");
rend_intro_point_free(intro);
goto err;
}
info->onion_key = tok->key;
tok->key = NULL; /* Prevent free */
/* Parse service key. */
tok = find_by_keyword(tokens, R_IPO_SERVICE_KEY);
if (!crypto_pk_public_exponent_ok(tok->key)) {
log_warn(LD_REND,
"Introduction point key had invalid exponent.");
rend_intro_point_free(intro);
goto err;
}
intro->intro_key = tok->key;
tok->key = NULL; /* Prevent free */
/* Add extend info to list of introduction points. */
smartlist_add(parsed->intro_nodes, intro);
}
result = smartlist_len(parsed->intro_nodes);
goto done;
err:
result = -1;
done:
/* Free tokens and clear token list. */
if (tokens) {
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
}
if (area)
memarea_drop_all(area);
return result;
}
/** Parse the content of a client_key file in <b>ckstr</b> and add
* rend_authorized_client_t's for each parsed client to
* <b>parsed_clients</b>. Return the number of parsed clients as result
* or -1 for failure. */
int
rend_parse_client_keys(strmap_t *parsed_clients, const char *ckstr)
{
int result = -1;
smartlist_t *tokens;
directory_token_t *tok;
const char *current_entry = NULL;
memarea_t *area = NULL;
char *err_msg = NULL;
if (!ckstr || strlen(ckstr) == 0)
return -1;
tokens = smartlist_new();
/* Begin parsing with first entry, skipping comments or whitespace at the
* beginning. */
area = memarea_new();
current_entry = eat_whitespace(ckstr);
while (!strcmpstart(current_entry, "client-name ")) {
rend_authorized_client_t *parsed_entry;
/* Determine end of string. */
const char *eos = strstr(current_entry, "\nclient-name ");
if (!eos)
eos = current_entry + strlen(current_entry);
else
eos = eos + 1;
/* Free tokens and clear token list. */
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_clear(tokens);
memarea_clear(area);
/* Tokenize string. */
if (tokenize_string(area, current_entry, eos, tokens,
client_keys_token_table, 0)) {
log_warn(LD_REND, "Error tokenizing client keys file.");
goto err;
}
/* Advance to next entry, if available. */
current_entry = eos;
/* Check minimum allowed length of token list. */
if (smartlist_len(tokens) < 2) {
log_warn(LD_REND, "Impossibly short client key entry.");
goto err;
}
/* Parse client name. */
tok = find_by_keyword(tokens, C_CLIENT_NAME);
tor_assert(tok == smartlist_get(tokens, 0));
tor_assert(tok->n_args == 1);
if (!rend_valid_client_name(tok->args[0])) {
log_warn(LD_CONFIG, "Illegal client name: %s. (Length must be "
"between 1 and %d, and valid characters are "
"[A-Za-z0-9+-_].)", tok->args[0], REND_CLIENTNAME_MAX_LEN);
goto err;
}
/* Check if client name is duplicate. */
if (strmap_get(parsed_clients, tok->args[0])) {
log_warn(LD_CONFIG, "HiddenServiceAuthorizeClient contains a "
"duplicate client name: '%s'. Ignoring.", tok->args[0]);
goto err;
}
parsed_entry = tor_malloc_zero(sizeof(rend_authorized_client_t));
parsed_entry->client_name = tor_strdup(tok->args[0]);
strmap_set(parsed_clients, parsed_entry->client_name, parsed_entry);
/* Parse client key. */
tok = find_opt_by_keyword(tokens, C_CLIENT_KEY);
if (tok) {
parsed_entry->client_key = tok->key;
tok->key = NULL; /* Prevent free */
}
/* Parse descriptor cookie. */
tok = find_by_keyword(tokens, C_DESCRIPTOR_COOKIE);
tor_assert(tok->n_args == 1);
if (rend_auth_decode_cookie(tok->args[0], parsed_entry->descriptor_cookie,
NULL, &err_msg) < 0) {
tor_assert(err_msg);
log_warn(LD_REND, "%s", err_msg);
tor_free(err_msg);
goto err;
}
}
result = strmap_size(parsed_clients);
goto done;
err:
result = -1;
done:
/* Free tokens and clear token list. */
SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
smartlist_free(tokens);
if (area)
memarea_drop_all(area);
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();
}
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