diff options
Diffstat (limited to 'src/or/rendclient.c')
| -rw-r--r-- | src/or/rendclient.c | 189 |
1 files changed, 127 insertions, 62 deletions
diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 0a9e2a605f..6a45207e29 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -16,6 +16,7 @@ #include "connection_edge.h" #include "directory.h" #include "main.h" +#include "nodelist.h" #include "relay.h" #include "rendclient.h" #include "rendcommon.h" @@ -80,8 +81,8 @@ rend_client_send_establish_rendezvous(origin_circuit_t *circ) /** Extend the introduction circuit <b>circ</b> to another valid * introduction point for the hidden service it is trying to connect * to, or mark it and launch a new circuit if we can't extend it. - * Return 0 on success. Return -1 and mark the introduction - * circuit on failure. + * Return 0 on success or possible success. Return -1 and mark the + * introduction circuit for close on permanent failure. * * On failure, the caller is responsible for marking the associated * rendezvous circuit for close. */ @@ -106,17 +107,11 @@ rend_client_reextend_intro_circuit(origin_circuit_t *circ) result = circuit_extend_to_new_exit(circ, extend_info); } else { log_info(LD_REND, - "Building a new introduction circuit, this time to %s.", - safe_str_client(extend_info_describe(extend_info))); + "Closing intro circ %d (out of RELAY_EARLY cells).", + circ->_base.n_circ_id); circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED); - if (!circuit_launch_by_extend_info(CIRCUIT_PURPOSE_C_INTRODUCING, - extend_info, - CIRCLAUNCH_IS_INTERNAL)) { - log_warn(LD_REND, "Building introduction circuit failed."); - result = -1; - } else { - result = 0; - } + /* connection_ap_handshake_attach_circuit will launch a new intro circ. */ + result = 0; } extend_info_free(extend_info); return result; @@ -144,6 +139,8 @@ rend_client_send_introduction(origin_circuit_t *introcirc, tor_assert(rendcirc->rend_data); tor_assert(!rend_cmp_service_ids(introcirc->rend_data->onion_address, rendcirc->rend_data->onion_address)); + tor_assert(!(introcirc->build_state->onehop_tunnel)); + tor_assert(!(rendcirc->build_state->onehop_tunnel)); if (rend_cache_lookup_entry(introcirc->rend_data->onion_address, -1, &entry) < 1) { @@ -334,6 +331,7 @@ rend_client_introduction_acked(origin_circuit_t *circ, } tor_assert(circ->build_state->chosen_exit); + tor_assert(!(circ->build_state->onehop_tunnel)); tor_assert(circ->rend_data); if (request_len == 0) { @@ -345,6 +343,7 @@ rend_client_introduction_acked(origin_circuit_t *circ, rendcirc = circuit_get_by_rend_query_and_purpose( circ->rend_data->onion_address, CIRCUIT_PURPOSE_C_REND_READY); if (rendcirc) { /* remember the ack */ + tor_assert(!(rendcirc->build_state->onehop_tunnel)); rendcirc->_base.purpose = CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED; /* Set timestamp_dirty, because circuit_expire_building expects * it to specify when a circuit entered the @@ -367,8 +366,8 @@ rend_client_introduction_acked(origin_circuit_t *circ, safe_str_client(circ->rend_data->onion_address), safe_str_client(extend_info_describe(circ->build_state->chosen_exit))); if (rend_client_report_intro_point_failure(circ->build_state->chosen_exit, - circ->rend_data, - INTRO_POINT_FAILURE_GENERIC)>0){ + circ->rend_data, + INTRO_POINT_FAILURE_GENERIC)>0) { /* There are introduction points left. Re-extend the circuit to * another intro point and try again. */ int result = rend_client_reextend_intro_circuit(circ); @@ -385,9 +384,12 @@ rend_client_introduction_acked(origin_circuit_t *circ, #define REND_HID_SERV_DIR_REQUERY_PERIOD (15 * 60) /** Contains the last request times to hidden service directories for - * certain queries; keys are strings consisting of base32-encoded - * hidden service directory identities and base32-encoded descriptor IDs; - * values are pointers to timestamps of the last requests. */ + * certain queries; each key is a string consisting of the + * concatenation of a base32-encoded HS directory identity digest, a + * base32-encoded HS descriptor ID, and a hidden service address + * (without the ".onion" part); each value is a pointer to a time_t + * holding the time of the last request for that descriptor ID to that + * HS directory. */ static strmap_t *last_hid_serv_requests_ = NULL; /** Returns last_hid_serv_requests_, initializing it to a new strmap if @@ -400,23 +402,34 @@ get_last_hid_serv_requests(void) return last_hid_serv_requests_; } +#define LAST_HID_SERV_REQUEST_KEY_LEN (REND_DESC_ID_V2_LEN_BASE32 + \ + REND_DESC_ID_V2_LEN_BASE32 + \ + REND_SERVICE_ID_LEN_BASE32) + /** Look up the last request time to hidden service directory <b>hs_dir</b> - * for descriptor ID <b>desc_id_base32</b>. If <b>set</b> is non-zero, + * for descriptor ID <b>desc_id_base32</b> for the service specified in + * <b>rend_query</b>. If <b>set</b> is non-zero, * assign the current time <b>now</b> and return that. Otherwise, return * the most recent request time, or 0 if no such request has been sent * before. */ static time_t lookup_last_hid_serv_request(routerstatus_t *hs_dir, - const char *desc_id_base32, time_t now, int set) + const char *desc_id_base32, + const rend_data_t *rend_query, + time_t now, int set) { char hsdir_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1]; - char hsdir_desc_comb_id[2 * REND_DESC_ID_V2_LEN_BASE32 + 1]; + char hsdir_desc_comb_id[LAST_HID_SERV_REQUEST_KEY_LEN + 1]; time_t *last_request_ptr; strmap_t *last_hid_serv_requests = get_last_hid_serv_requests(); base32_encode(hsdir_id_base32, sizeof(hsdir_id_base32), hs_dir->identity_digest, DIGEST_LEN); - tor_snprintf(hsdir_desc_comb_id, sizeof(hsdir_desc_comb_id), "%s%s", - hsdir_id_base32, desc_id_base32); + tor_snprintf(hsdir_desc_comb_id, sizeof(hsdir_desc_comb_id), "%s%s%s", + hsdir_id_base32, + desc_id_base32, + rend_query->onion_address); + /* XXX023 tor_assert(strlen(hsdir_desc_comb_id) == + LAST_HID_SERV_REQUEST_KEY_LEN); */ if (set) { time_t *oldptr; last_request_ptr = tor_malloc_zero(sizeof(time_t)); @@ -434,10 +447,10 @@ lookup_last_hid_serv_request(routerstatus_t *hs_dir, * it does not contain requests older than REND_HID_SERV_DIR_REQUERY_PERIOD * seconds any more. */ static void -directory_clean_last_hid_serv_requests(void) +directory_clean_last_hid_serv_requests(time_t now) { strmap_iter_t *iter; - time_t cutoff = time(NULL) - REND_HID_SERV_DIR_REQUERY_PERIOD; + time_t cutoff = now - REND_HID_SERV_DIR_REQUERY_PERIOD; strmap_t *last_hid_serv_requests = get_last_hid_serv_requests(); for (iter = strmap_iter_init(last_hid_serv_requests); !strmap_iter_done(iter); ) { @@ -455,6 +468,33 @@ directory_clean_last_hid_serv_requests(void) } } +/** Remove all requests related to the hidden service named + * <b>onion_address</b> from the history of times of requests to + * hidden service directories. */ +static void +purge_hid_serv_from_last_hid_serv_requests(const char *onion_address) +{ + strmap_iter_t *iter; + strmap_t *last_hid_serv_requests = get_last_hid_serv_requests(); + /* XXX023 tor_assert(strlen(onion_address) == REND_SERVICE_ID_LEN_BASE32); */ + for (iter = strmap_iter_init(last_hid_serv_requests); + !strmap_iter_done(iter); ) { + const char *key; + void *val; + strmap_iter_get(iter, &key, &val); + /* XXX023 tor_assert(strlen(key) == LAST_HID_SERV_REQUEST_KEY_LEN); */ + if (tor_memeq(key + LAST_HID_SERV_REQUEST_KEY_LEN - + REND_SERVICE_ID_LEN_BASE32, + onion_address, + REND_SERVICE_ID_LEN_BASE32)) { + iter = strmap_iter_next_rmv(last_hid_serv_requests, iter); + tor_free(val); + } else { + iter = strmap_iter_next(last_hid_serv_requests, iter); + } + } +} + /** Purge the history of request times to hidden service directories, * so that future lookups of an HS descriptor will not fail because we * accessed all of the HSDir relays responsible for the descriptor @@ -476,12 +516,11 @@ rend_client_purge_last_hid_serv_requests(void) } /** Determine the responsible hidden service directories for <b>desc_id</b> - * and fetch the descriptor belonging to that ID from one of them. Only - * send a request to hidden service directories that we did not try within - * the last REND_HID_SERV_DIR_REQUERY_PERIOD seconds; on success, return 1, + * and fetch the descriptor with that ID from one of them. Only + * send a request to a hidden service directory that we have not yet tried + * during this attempt to connect to this hidden service; on success, return 1, * in the case that no hidden service directory is left to ask for the - * descriptor, return 0, and in case of a failure -1. <b>query</b> is only - * passed for pretty log statements. */ + * descriptor, return 0, and in case of a failure -1. */ static int directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query) { @@ -501,12 +540,16 @@ directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query) /* Only select those hidden service directories to which we did not send * a request recently and for which we have a router descriptor here. */ - directory_clean_last_hid_serv_requests(); /* Clean request history first. */ + + /* Clean request history first. */ + directory_clean_last_hid_serv_requests(now); SMARTLIST_FOREACH(responsible_dirs, routerstatus_t *, dir, { - if (lookup_last_hid_serv_request(dir, desc_id_base32, 0, 0) + - REND_HID_SERV_DIR_REQUERY_PERIOD >= now || - !router_get_by_digest(dir->identity_digest)) + time_t last = lookup_last_hid_serv_request( + dir, desc_id_base32, rend_query, 0, 0); + const node_t *node = node_get_by_id(dir->identity_digest); + if (last + REND_HID_SERV_DIR_REQUERY_PERIOD >= now || + !node || !node_has_descriptor(node)) SMARTLIST_DEL_CURRENT(responsible_dirs, dir); }); @@ -519,9 +562,9 @@ directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query) return 0; } - /* Remember, that we are requesting a descriptor from this hidden service + /* Remember that we are requesting a descriptor from this hidden service * directory now. */ - lookup_last_hid_serv_request(hs_dir, desc_id_base32, now, 1); + lookup_last_hid_serv_request(hs_dir, desc_id_base32, rend_query, now, 1); /* Encode descriptor cookie for logging purposes. */ if (rend_query->auth_type != REND_NO_AUTH) { @@ -859,40 +902,42 @@ rend_client_receive_rendezvous(origin_circuit_t *circ, const uint8_t *request, void rend_client_desc_trynow(const char *query) { - edge_connection_t *conn; + entry_connection_t *conn; rend_cache_entry_t *entry; + const rend_data_t *rend_data; time_t now = time(NULL); smartlist_t *conns = get_connection_array(); - SMARTLIST_FOREACH_BEGIN(conns, connection_t *, _conn) { - if (_conn->type != CONN_TYPE_AP || - _conn->state != AP_CONN_STATE_RENDDESC_WAIT || - _conn->marked_for_close) + SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) { + if (base_conn->type != CONN_TYPE_AP || + base_conn->state != AP_CONN_STATE_RENDDESC_WAIT || + base_conn->marked_for_close) continue; - conn = TO_EDGE_CONN(_conn); - if (!conn->rend_data) + conn = TO_ENTRY_CONN(base_conn); + rend_data = ENTRY_TO_EDGE_CONN(conn)->rend_data; + if (!rend_data) continue; - if (rend_cmp_service_ids(query, conn->rend_data->onion_address)) + if (rend_cmp_service_ids(query, rend_data->onion_address)) continue; - assert_connection_ok(TO_CONN(conn), now); - if (rend_cache_lookup_entry(conn->rend_data->onion_address, -1, + assert_connection_ok(base_conn, now); + if (rend_cache_lookup_entry(rend_data->onion_address, -1, &entry) == 1 && rend_client_any_intro_points_usable(entry)) { /* either this fetch worked, or it failed but there was a * valid entry from before which we should reuse */ log_info(LD_REND,"Rend desc is usable. Launching circuits."); - conn->_base.state = AP_CONN_STATE_CIRCUIT_WAIT; + base_conn->state = AP_CONN_STATE_CIRCUIT_WAIT; /* restart their timeout values, so they get a fair shake at * connecting to the hidden service. */ - conn->_base.timestamp_created = now; - conn->_base.timestamp_lastread = now; - conn->_base.timestamp_lastwritten = now; + base_conn->timestamp_created = now; + base_conn->timestamp_lastread = now; + base_conn->timestamp_lastwritten = now; if (connection_ap_handshake_attach_circuit(conn) < 0) { /* it will never work */ log_warn(LD_REND,"Rendezvous attempt failed. Closing."); - if (!conn->_base.marked_for_close) + if (!base_conn->marked_for_close) connection_mark_unattached_ap(conn, END_STREAM_REASON_CANT_ATTACH); } } else { /* 404, or fetch didn't get that far */ @@ -902,7 +947,7 @@ rend_client_desc_trynow(const char *query) connection_mark_unattached_ap(conn, END_STREAM_REASON_RESOLVEFAILED); rend_client_note_connection_attempt_ended(query); } - } SMARTLIST_FOREACH_END(_conn); + } SMARTLIST_FOREACH_END(base_conn); } /** Clear temporary state used only during an attempt to connect to @@ -925,6 +970,9 @@ rend_client_note_connection_attempt_ended(const char *onion_address) rend_intro_point_t *, ip, ip->timed_out = 0; ); } + + /* Remove the HS's entries in last_hid_serv_requests. */ + purge_hid_serv_from_last_hid_serv_requests(onion_address); } /** Return a newly allocated extend_info_t* for a randomly chosen introduction @@ -966,8 +1014,7 @@ rend_client_get_random_intro_impl(const rend_cache_entry_t *entry, int i; rend_intro_point_t *intro; - routerinfo_t *router; - or_options_t *options = get_options(); + const or_options_t *options = get_options(); smartlist_t *usable_nodes; int n_excluded = 0; @@ -1000,21 +1047,33 @@ rend_client_get_random_intro_impl(const rend_cache_entry_t *entry, intro = smartlist_get(usable_nodes, i); /* Do we need to look up the router or is the extend info complete? */ if (!intro->extend_info->onion_key) { + const node_t *node; + extend_info_t *new_extend_info; if (tor_digest_is_zero(intro->extend_info->identity_digest)) - router = router_get_by_hexdigest(intro->extend_info->nickname); + node = node_get_by_hex_id(intro->extend_info->nickname); else - router = router_get_by_digest(intro->extend_info->identity_digest); - if (!router) { + node = node_get_by_id(intro->extend_info->identity_digest); + if (!node) { log_info(LD_REND, "Unknown router with nickname '%s'; trying another.", intro->extend_info->nickname); smartlist_del(usable_nodes, i); goto again; } - extend_info_free(intro->extend_info); - intro->extend_info = extend_info_from_router(router); + new_extend_info = extend_info_from_node(node); + if (!new_extend_info) { + log_info(LD_REND, "We don't have a descriptor for the intro-point relay " + "'%s'; trying another.", + extend_info_describe(intro->extend_info)); + smartlist_del(usable_nodes, i); + goto again; + } else { + extend_info_free(intro->extend_info); + intro->extend_info = new_extend_info; + } + tor_assert(intro->extend_info != NULL); } /* Check if we should refuse to talk to this router. */ - if (options->ExcludeNodes && strict && + if (strict && routerset_contains_extendinfo(options->ExcludeNodes, intro->extend_info)) { n_excluded++; @@ -1031,8 +1090,13 @@ rend_client_get_random_intro_impl(const rend_cache_entry_t *entry, int rend_client_any_intro_points_usable(const rend_cache_entry_t *entry) { - return rend_client_get_random_intro_impl( - entry, get_options()->StrictNodes, 0) != NULL; + extend_info_t *extend_info = + rend_client_get_random_intro_impl(entry, get_options()->StrictNodes, 0); + + int rv = (extend_info != NULL); + + extend_info_free(extend_info); + return rv; } /** Client-side authorizations for hidden services; map of onion address to @@ -1080,7 +1144,8 @@ rend_service_authorization_free_all(void) * service and add it to the local map of hidden service authorizations. * Return 0 for success and -1 for failure. */ int -rend_parse_service_authorization(or_options_t *options, int validate_only) +rend_parse_service_authorization(const or_options_t *options, + int validate_only) { config_line_t *line; int res = -1; |