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- /* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- #include "or.h"
- /**
- * \file router.c
- * \brief OR functionality, including key maintenance, generating
- * and uploading server descriptors, retrying OR connections.
- **/
- extern or_options_t options; /* command-line and config-file options */
- /** Exposed for test.c. */ void get_platform_str(char *platform, int len);
- /************************************************************/
- /*****
- * Key management: ORs only.
- *****/
- /** Private keys for this OR. There is also an SSL key managed by tortls.c.
- */
- static tor_mutex_t *key_lock=NULL;
- static time_t onionkey_set_at=0; /* When was onionkey last changed? */
- static crypto_pk_env_t *onionkey=NULL;
- static crypto_pk_env_t *lastonionkey=NULL;
- static crypto_pk_env_t *identitykey=NULL;
- /** Replace the current onion key with <b>k</b>. Does not affect lastonionkey;
- * to update onionkey correctly, call rotate_onion_key().
- */
- void set_onion_key(crypto_pk_env_t *k) {
- tor_mutex_acquire(key_lock);
- onionkey = k;
- onionkey_set_at = time(NULL);
- tor_mutex_release(key_lock);
- }
- /** Return the current onion key. Requires that the onion key has been
- * loaded or generated. */
- crypto_pk_env_t *get_onion_key(void) {
- tor_assert(onionkey);
- return onionkey;
- }
- /** Return the onion key that was current before the most recent onion
- * key rotation. If no rotation has been performed since this process
- * started, return NULL.
- */
- crypto_pk_env_t *get_previous_onion_key(void) {
- return lastonionkey;
- }
- void dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last)
- {
- tor_assert(key && last);
- tor_mutex_acquire(key_lock);
- *key = crypto_pk_dup_key(onionkey);
- if (lastonionkey)
- *last = crypto_pk_dup_key(lastonionkey);
- else
- *last = NULL;
- tor_mutex_release(key_lock);
- }
- /** Return the time when the onion key was last set. This is either the time
- * when the process launched, or the time of the most recent key rotation since
- * the process launched.
- */
- time_t get_onion_key_set_at(void) {
- return onionkey_set_at;
- }
- /** Set the current identity key to k.
- */
- void set_identity_key(crypto_pk_env_t *k) {
- identitykey = k;
- }
- /** Returns the current identity key; requires that the identity key has been
- * set.
- */
- crypto_pk_env_t *get_identity_key(void) {
- tor_assert(identitykey);
- return identitykey;
- }
- /** Replace the previous onion key with the current onion key, and generate
- * a new previous onion key. Immediately after calling this function,
- * the OR should:
- * - schedule all previous cpuworkers to shut down _after_ processing
- * pending work. (This will cause fresh cpuworkers to be generated.)
- * - generate and upload a fresh routerinfo.
- */
- void rotate_onion_key(void)
- {
- char fname[512];
- crypto_pk_env_t *prkey;
- sprintf(fname,"%s/keys/onion.key",options.DataDirectory);
- if (!(prkey = crypto_new_pk_env())) {
- log(LOG_ERR, "Error creating crypto environment.");
- goto error;
- }
- if (crypto_pk_generate_key(prkey)) {
- log(LOG_ERR, "Error generating onion key");
- goto error;
- }
- if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
- log(LOG_ERR, "Couldn't write generated key to %s.", fname);
- goto error;
- }
- tor_mutex_acquire(key_lock);
- if (lastonionkey)
- crypto_free_pk_env(lastonionkey);
- log_fn(LOG_INFO, "Rotating onion key");
- lastonionkey = onionkey;
- set_onion_key(prkey);
- tor_mutex_release(key_lock);
- return;
- error:
- log_fn(LOG_WARN, "Couldn't rotate onion key.");
- }
- /** Try to read an RSA key from <b>fname</b>. If <b>fname</b> doesn't exist,
- * create a new RSA key and save it in <b>fname</b>. Return the read/created
- * key, or NULL on error.
- */
- crypto_pk_env_t *init_key_from_file(const char *fname)
- {
- crypto_pk_env_t *prkey = NULL;
- FILE *file = NULL;
- if (!(prkey = crypto_new_pk_env())) {
- log(LOG_ERR, "Error creating crypto environment.");
- goto error;
- }
- switch(file_status(fname)) {
- case FN_DIR:
- case FN_ERROR:
- log(LOG_ERR, "Can't read key from %s", fname);
- goto error;
- case FN_NOENT:
- log(LOG_INFO, "No key found in %s; generating fresh key.", fname);
- if (crypto_pk_generate_key(prkey)) {
- log(LOG_ERR, "Error generating onion key");
- goto error;
- }
- if (crypto_pk_check_key(prkey) <= 0) {
- log(LOG_ERR, "Generated key seems invalid");
- goto error;
- }
- log(LOG_INFO, "Generated key seems valid");
- if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
- log(LOG_ERR, "Couldn't write generated key to %s.", fname);
- goto error;
- }
- return prkey;
- case FN_FILE:
- if (crypto_pk_read_private_key_from_filename(prkey, fname)) {
- log(LOG_ERR, "Error loading private key.");
- goto error;
- }
- return prkey;
- default:
- tor_assert(0);
- }
- error:
- if (prkey)
- crypto_free_pk_env(prkey);
- if (file)
- fclose(file);
- return NULL;
- }
- /** Initialize all OR private keys, and the TLS context, as necessary.
- * On OPs, this only initializes the tls context.
- */
- int init_keys(void) {
- char keydir[512];
- char fingerprint[FINGERPRINT_LEN+MAX_NICKNAME_LEN+3];
- char *cp;
- const char *tmp, *mydesc;
- crypto_pk_env_t *prkey;
- if (!key_lock)
- key_lock = tor_mutex_new();
- /* OP's don't need keys. Just initialize the TLS context.*/
- if (!options.ORPort) {
- tor_assert(!options.DirPort);
- if (tor_tls_context_new(NULL, 0, NULL, 0)<0) {
- log_fn(LOG_ERR, "Error creating TLS context for OP.");
- return -1;
- }
- return 0;
- }
- /* Make sure DataDirectory exists, and is private. */
- tor_assert(options.DataDirectory);
- if (strlen(options.DataDirectory) > (512-128)) {
- log_fn(LOG_ERR, "DataDirectory is too long.");
- return -1;
- }
- if (check_private_dir(options.DataDirectory, 1)) {
- return -1;
- }
- /* Check the key directory. */
- sprintf(keydir,"%s/keys",options.DataDirectory);
- if (check_private_dir(keydir, 1)) {
- return -1;
- }
- cp = keydir + strlen(keydir); /* End of string. */
- /* 1. Read identity key. Make it if none is found. */
- strcpy(cp, "/identity.key");
- log_fn(LOG_INFO,"Reading/making identity key %s...",keydir);
- prkey = init_key_from_file(keydir);
- if (!prkey) return -1;
- set_identity_key(prkey);
- /* 2. Read onion key. Make it if none is found. */
- strcpy(cp, "/onion.key");
- log_fn(LOG_INFO,"Reading/making onion key %s...",keydir);
- prkey = init_key_from_file(keydir);
- if (!prkey) return -1;
- set_onion_key(prkey);
- /* 3. Initialize link key and TLS context. */
- if (tor_tls_context_new(get_identity_key(), 1, options.Nickname,
- MAX_SSL_KEY_LIFETIME) < 0) {
- log_fn(LOG_ERR, "Error initializing TLS context");
- return -1;
- }
- /* 4. Dump router descriptor to 'router.desc' */
- /* Must be called after keys are initialized. */
- if (!(router_get_my_descriptor())) {
- log_fn(LOG_ERR, "Error initializing descriptor.");
- return -1;
- }
- /* We need to add our own fingerprint so it gets recognized. */
- if (dirserv_add_own_fingerprint(options.Nickname, get_identity_key())) {
- log_fn(LOG_ERR, "Error adding own fingerprint to approved set");
- return -1;
- }
- tmp = mydesc = router_get_my_descriptor();
- if (dirserv_add_descriptor(&tmp) != 1) {
- log(LOG_ERR, "Unable to add own descriptor to directory.");
- return -1;
- }
- sprintf(keydir,"%s/router.desc", options.DataDirectory);
- log_fn(LOG_INFO,"Dumping descriptor to %s...",keydir);
- if (write_str_to_file(keydir, mydesc)) {
- return -1;
- }
- /* 5. Dump fingerprint to 'fingerprint' */
- sprintf(keydir,"%s/fingerprint", options.DataDirectory);
- log_fn(LOG_INFO,"Dumping fingerprint to %s...",keydir);
- tor_assert(strlen(options.Nickname) <= MAX_NICKNAME_LEN);
- strcpy(fingerprint, options.Nickname);
- strcat(fingerprint, " ");
- if (crypto_pk_get_fingerprint(get_identity_key(),
- fingerprint+strlen(fingerprint))<0) {
- log_fn(LOG_ERR, "Error computing fingerprint");
- return -1;
- }
- strcat(fingerprint, "\n");
- if (write_str_to_file(keydir, fingerprint))
- return -1;
- if(!options.DirPort)
- return 0;
- /* 6. [dirserver only] load approved-routers file */
- sprintf(keydir,"%s/approved-routers", options.DataDirectory);
- log_fn(LOG_INFO,"Loading approved fingerprints from %s...",keydir);
- if(dirserv_parse_fingerprint_file(keydir) < 0) {
- log_fn(LOG_ERR, "Error loading fingerprints");
- return -1;
- }
- /* 7. [dirserver only] load old directory, if it's there */
- sprintf(keydir,"%s/cached-directory", options.DataDirectory);
- log_fn(LOG_INFO,"Loading cached directory from %s...",keydir);
- cp = read_file_to_str(keydir);
- if(!cp) {
- log_fn(LOG_INFO,"Cached directory %s not present. Ok.",keydir);
- } else {
- if(options.AuthoritativeDir && dirserv_load_from_directory_string(cp) < 0){
- log_fn(LOG_ERR, "Cached directory %s is corrupt", keydir);
- free(cp);
- return -1;
- }
- /* set time to 1 so it will be replaced on first download.
- */
- dirserv_set_cached_directory(cp, 1);
- }
- /* success */
- return 0;
- }
- /*
- * Clique maintenance
- */
- /** OR only: try to open connections to all of the other ORs we know about.
- */
- void router_retry_connections(void) {
- int i;
- routerinfo_t *router;
- routerlist_t *rl;
- router_get_routerlist(&rl);
- for (i=0;i < smartlist_len(rl->routers);i++) {
- router = smartlist_get(rl->routers, i);
- if(router_is_me(router))
- continue;
- if(!connection_exact_get_by_addr_port(router->addr,router->or_port)) {
- /* not in the list */
- log_fn(LOG_DEBUG,"connecting to OR %s:%u.",router->address,router->or_port);
- connection_or_connect(router);
- }
- }
- }
- /*
- * OR descriptor generation.
- */
- /** My routerinfo. */
- static routerinfo_t *desc_routerinfo = NULL;
- /** String representation of my descriptor, signed by me. */
- static char descriptor[8192];
- /** OR only: try to upload our signed descriptor to all the directory servers
- * we know about.
- */
- void router_upload_dir_desc_to_dirservers(void) {
- const char *s;
- s = router_get_my_descriptor();
- if (!s) {
- log_fn(LOG_WARN, "No descriptor; skipping upload");
- return;
- }
- directory_post_to_dirservers(DIR_PURPOSE_UPLOAD_DIR, s, strlen(s));
- }
- #define DEFAULT_EXIT_POLICY "reject 0.0.0.0/8,reject 169.254.0.0/16,reject 127.0.0.0/8,reject 192.168.0.0/16,reject 10.0.0.0/8,reject 172.16.0.0/12,accept *:20-22,accept *:53,accept *:79-81,accept *:110,accept *:143,accept *:443,accept *:873,accept *:993,accept *:995,accept *:1024-65535,reject *:*"
- /** Set the exit policy on <b>router</b> to match the exit policy in the
- * current configuration file. If the exit policy doesn't have a catch-all
- * rule, then append the default exit policy as well.
- */
- static void router_add_exit_policy_from_config(routerinfo_t *router) {
- struct exit_policy_t *ep;
- struct config_line_t default_policy;
- config_parse_exit_policy(options.ExitPolicy, &router->exit_policy);
- for (ep = router->exit_policy; ep; ep = ep->next) {
- if (ep->msk == 0 && ep->prt_min <= 1 && ep->prt_max >= 65535) {
- /* if exitpolicy includes a *:* line, then we're done. */
- return;
- }
- }
- /* Else, append the default exitpolicy. */
- default_policy.key = NULL;
- default_policy.value = DEFAULT_EXIT_POLICY;
- default_policy.next = NULL;
- config_parse_exit_policy(&default_policy, &router->exit_policy);
- }
- /** OR only: Return false if my exit policy says to allow connection to
- * conn. Else return true.
- */
- int router_compare_to_my_exit_policy(connection_t *conn)
- {
- tor_assert(desc_routerinfo);
- tor_assert(conn->addr); /* make sure it's resolved to something. this
- way we can't get a 'maybe' below. */
- return router_compare_addr_to_exit_policy(conn->addr, conn->port,
- desc_routerinfo->exit_policy);
- }
- /** Return true iff <b>router</b> has the same nickname as this OR. (For an
- * OP, always returns false.)
- */
- int router_is_me(routerinfo_t *router)
- {
- tor_assert(router);
- return options.Nickname && !strcasecmp(router->nickname, options.Nickname);
- }
- /** Return a routerinfo for this OR, rebuilding a fresh one if
- * necessary. Return NULL on error, or if called on an OP. */
- routerinfo_t *router_get_my_routerinfo(void)
- {
- if (!options.ORPort)
- return NULL;
- if (!desc_routerinfo) {
- if (router_rebuild_descriptor())
- return NULL;
- }
- return desc_routerinfo;
- }
- /** OR only: Return a signed server descriptor for this OR, rebuilding a fresh
- * one if necessary. Return NULL on error.
- */
- const char *router_get_my_descriptor(void) {
- if (!desc_routerinfo) {
- if (router_rebuild_descriptor())
- return NULL;
- }
- log_fn(LOG_DEBUG,"my desc is '%s'",descriptor);
- return descriptor;
- }
- /** Rebuild a fresh routerinfo and signed server descriptor for this
- * OR. Return 0 on success, -1 on error.
- */
- int router_rebuild_descriptor(void) {
- routerinfo_t *ri;
- struct in_addr addr;
- char platform[256];
- if (!tor_inet_aton(options.Address, &addr)) {
- log_fn(LOG_ERR, "options.Address didn't hold an IP.");
- return -1;
- }
- ri = tor_malloc_zero(sizeof(routerinfo_t));
- ri->address = tor_strdup(options.Address);
- ri->nickname = tor_strdup(options.Nickname);
- ri->addr = (uint32_t) ntohl(addr.s_addr);
- ri->or_port = options.ORPort;
- ri->socks_port = options.SocksPort;
- ri->dir_port = options.DirPort;
- ri->published_on = time(NULL);
- ri->onion_pkey = crypto_pk_dup_key(get_onion_key()); /* must invoke from main thread */
- ri->identity_pkey = crypto_pk_dup_key(get_identity_key());
- get_platform_str(platform, sizeof(platform));
- ri->platform = tor_strdup(platform);
- ri->bandwidthrate = options.BandwidthRate;
- ri->bandwidthburst = options.BandwidthBurst;
- ri->exit_policy = NULL; /* zero it out first */
- router_add_exit_policy_from_config(ri);
- if (desc_routerinfo)
- routerinfo_free(desc_routerinfo);
- desc_routerinfo = ri;
- if (router_dump_router_to_string(descriptor, 8192, ri, get_identity_key())<0) {
- log_fn(LOG_WARN, "Couldn't dump router to string.");
- return -1;
- }
- if (ri->dir_port)
- ri->is_trusted_dir = 1;
- return 0;
- }
- /** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short
- * string describing the version of Tor and the operating system we're
- * currently running on.
- */
- void get_platform_str(char *platform, int len)
- {
- snprintf(platform, len-1, "Tor %s on %s", VERSION, get_uname());
- platform[len-1] = '\0';
- return;
- }
- /* XXX need to audit this thing and count fenceposts. maybe
- * refactor so we don't have to keep asking if we're
- * near the end of maxlen?
- */
- #define DEBUG_ROUTER_DUMP_ROUTER_TO_STRING
- /** OR only: Given a routerinfo for this router, and an identity key to sign
- * with, encode the routerinfo as a signed server descriptor and write the
- * result into <b>s</b>, using at most <b>maxlen</b> bytes. Return -1 on
- * failure, and the number of bytes used on success.
- */
- int router_dump_router_to_string(char *s, int maxlen, routerinfo_t *router,
- crypto_pk_env_t *ident_key) {
- char *onion_pkey; /* Onion key, PEM-encoded. */
- char *identity_pkey; /* Identity key, PEM-encoded. */
- char digest[20];
- char signature[128];
- char published[32];
- struct in_addr in;
- int onion_pkeylen, identity_pkeylen;
- int written;
- int result=0;
- struct exit_policy_t *tmpe;
- #ifdef DEBUG_ROUTER_DUMP_ROUTER_TO_STRING
- char *s_tmp, *s_dup;
- const char *cp;
- routerinfo_t *ri_tmp;
- #endif
- /* Make sure the identity key matches the one in the routerinfo. */
- if (crypto_pk_cmp_keys(ident_key, router->identity_pkey)) {
- log_fn(LOG_WARN,"Tried to sign a router with a private key that didn't match router's public key!");
- return -1;
- }
- /* PEM-encode the onion key */
- if(crypto_pk_write_public_key_to_string(router->onion_pkey,
- &onion_pkey,&onion_pkeylen)<0) {
- log_fn(LOG_WARN,"write onion_pkey to string failed!");
- return -1;
- }
- /* PEM-encode the identity key key */
- if(crypto_pk_write_public_key_to_string(router->identity_pkey,
- &identity_pkey,&identity_pkeylen)<0) {
- log_fn(LOG_WARN,"write identity_pkey to string failed!");
- tor_free(onion_pkey);
- return -1;
- }
- /* Encode the publication time. */
- strftime(published, 32, "%Y-%m-%d %H:%M:%S", gmtime(&router->published_on));
- /* Generate the easy portion of the router descriptor. */
- result = snprintf(s, maxlen,
- "router %s %s %d %d %d\n"
- "platform %s\n"
- "published %s\n"
- "bandwidth %d %d\n"
- "onion-key\n%s"
- "signing-key\n%s",
- router->nickname,
- router->address,
- router->or_port,
- router->socks_port,
- /* Due to an 0.0.7 bug, we can't actually say that we have a dirport unles
- * we're an authoritative directory.
- */
- router->is_trusted_dir ? router->dir_port : 0,
- router->platform,
- published,
- (int) router->bandwidthrate,
- (int) router->bandwidthburst,
- onion_pkey, identity_pkey);
- tor_free(onion_pkey);
- tor_free(identity_pkey);
- if(result < 0 || result >= maxlen) {
- /* apparently different glibcs do different things on snprintf error.. so check both */
- return -1;
- }
- /* From now on, we use 'written' to remember the current length of 's'. */
- written = result;
- if (router->dir_port && !router->is_trusted_dir) {
- /* dircacheport wasn't recognized before 0.0.8pre. (When 0.0.7 is gone,
- * we can fold this back into dirport anyway.) */
- result = snprintf(s+written,maxlen-written, "opt dircacheport %d\n",
- router->dir_port);
- if (result<0 || result+written > maxlen)
- return -1;
- written += result;
- }
- if (options.ContactInfo && strlen(options.ContactInfo)) {
- result = snprintf(s+written,maxlen-written, "opt contact %s\n",
- options.ContactInfo);
- if (result<0 || result+written > maxlen)
- return -1;
- written += result;
- }
- /* Write the exit policy to the end of 's'. */
- for(tmpe=router->exit_policy; tmpe; tmpe=tmpe->next) {
- in.s_addr = htonl(tmpe->addr);
- /* Write: "accept 1.2.3.4" */
- result = snprintf(s+written, maxlen-written, "%s %s",
- tmpe->policy_type == EXIT_POLICY_ACCEPT ? "accept" : "reject",
- tmpe->msk == 0 ? "*" : inet_ntoa(in));
- if(result < 0 || result+written > maxlen) {
- /* apparently different glibcs do different things on snprintf error.. so check both */
- return -1;
- }
- written += result;
- if (tmpe->msk != 0xFFFFFFFFu && tmpe->msk != 0) {
- /* Write "/255.255.0.0" */
- in.s_addr = htonl(tmpe->msk);
- result = snprintf(s+written, maxlen-written, "/%s", inet_ntoa(in));
- if (result<0 || result+written > maxlen)
- return -1;
- written += result;
- }
- if (tmpe->prt_min == 0 && tmpe->prt_max == 65535) {
- /* There is no port set; write ":*" */
- if (written > maxlen-4)
- return -1;
- strcat(s+written, ":*\n");
- written += 3;
- } else if (tmpe->prt_min == tmpe->prt_max) {
- /* There is only one port; write ":80". */
- result = snprintf(s+written, maxlen-written, ":%d\n", tmpe->prt_min);
- if (result<0 || result+written > maxlen)
- return -1;
- written += result;
- } else {
- /* There is a range of ports; write ":79-80". */
- result = snprintf(s+written, maxlen-written, ":%d-%d\n", tmpe->prt_min,
- tmpe->prt_max);
- if (result<0 || result+written > maxlen)
- return -1;
- written += result;
- }
- } /* end for */
- if (written > maxlen-256) /* Not enough room for signature. */
- return -1;
- /* Sign the directory */
- strcat(s+written, "router-signature\n");
- written += strlen(s+written);
- s[written] = '\0';
- if (router_get_router_hash(s, digest) < 0)
- return -1;
- if (crypto_pk_private_sign(ident_key, digest, 20, signature) < 0) {
- log_fn(LOG_WARN, "Error signing digest");
- return -1;
- }
- strcat(s+written, "-----BEGIN SIGNATURE-----\n");
- written += strlen(s+written);
- if (base64_encode(s+written, maxlen-written, signature, 128) < 0) {
- log_fn(LOG_WARN, "Couldn't base64-encode signature");
- return -1;
- }
- written += strlen(s+written);
- strcat(s+written, "-----END SIGNATURE-----\n");
- written += strlen(s+written);
- if (written > maxlen-2)
- return -1;
- /* include a last '\n' */
- s[written] = '\n';
- s[written+1] = 0;
- #ifdef DEBUG_ROUTER_DUMP_ROUTER_TO_STRING
- cp = s_tmp = s_dup = tor_strdup(s);
- ri_tmp = router_parse_entry_from_string(cp, NULL);
- if (!ri_tmp) {
- log_fn(LOG_ERR, "We just generated a router descriptor we can't parse: <<%s>>",
- s);
- return -1;
- }
- free(s_dup);
- routerinfo_free(ri_tmp);
- #endif
- return written+1;
- }
- /*
- Local Variables:
- mode:c
- indent-tabs-mode:nil
- c-basic-offset:2
- End:
- */
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