/* Copyright 2001-2004 Roger Dingledine. * Copyright 2004-2006 Roger Dingledine, Nick Mathewson. */ /* See LICENSE for licensing information */ /* $Id$ */ const char directory_c_id[] = "$Id$"; #include "or.h" /** * \file directory.c * \brief Code to send and fetch directories and router * descriptors via HTTP. Directories use dirserv.c to generate the * results; clients use routers.c to parse them. **/ /* In-points to directory.c: * * - directory_post_to_dirservers(), called from * router_upload_dir_desc_to_dirservers() in router.c * upload_service_descriptor() in rendservice.c * - directory_get_from_dirserver(), called from * rend_client_refetch_renddesc() in rendclient.c * run_scheduled_events() in main.c * do_hup() in main.c * - connection_dir_process_inbuf(), called from * connection_process_inbuf() in connection.c * - connection_dir_finished_flushing(), called from * connection_finished_flushing() in connection.c * - connection_dir_finished_connecting(), called from * connection_finished_connecting() in connection.c */ static void directory_initiate_command(const char *address, uint32_t addr, uint16_t port, const char *platform, const char *digest, uint8_t purpose, int private_connection, const char *resource, const char *payload, size_t payload_len); static void directory_send_command(connection_t *conn, const char *platform, int purpose, const char *resource, const char *payload, size_t payload_len); static int directory_handle_command(connection_t *conn); static int body_is_plausible(const char *body, size_t body_len, int purpose); static int purpose_is_private(uint8_t purpose); static char *http_get_header(const char *headers, const char *which); static char *http_get_origin(const char *headers, connection_t *conn); static void connection_dir_download_networkstatus_failed(connection_t *conn); static void connection_dir_download_routerdesc_failed(connection_t *conn); static void dir_networkstatus_download_failed(smartlist_t *failed); static void dir_routerdesc_download_failed(smartlist_t *failed); static void note_request(const char *key, size_t bytes); /********* START VARIABLES **********/ /** How far in the future do we allow a directory server to tell us it is * before deciding that one of us has the wrong time? */ #define ALLOW_DIRECTORY_TIME_SKEW (30*60) /********* END VARIABLES ************/ /** Return true iff the directory purpose 'purpose' must use an * anonymous connection to a directory. */ static int purpose_is_private(uint8_t purpose) { if (get_options()->AllDirActionsPrivate) return 1; if (purpose == DIR_PURPOSE_FETCH_DIR || purpose == DIR_PURPOSE_UPLOAD_DIR || purpose == DIR_PURPOSE_FETCH_RUNNING_LIST || purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS || purpose == DIR_PURPOSE_FETCH_SERVERDESC) return 0; return 1; } /** Start a connection to every known directory server, using * connection purpose 'purpose' and uploading the payload 'payload' * (length 'payload_len'). The purpose should be one of * 'DIR_PURPOSE_UPLOAD_DIR' or 'DIR_PURPOSE_UPLOAD_RENDDESC'. */ void directory_post_to_dirservers(uint8_t purpose, const char *payload, size_t payload_len) { smartlist_t *dirservers; int post_via_tor; int post_to_v1_only; dirservers = router_get_trusted_dir_servers(); tor_assert(dirservers); /* Only old dirservers handle rendezvous descriptor publishing. */ post_to_v1_only = (purpose == DIR_PURPOSE_UPLOAD_RENDDESC); /* This tries dirservers which we believe to be down, but ultimately, that's * harmless, and we may as well err on the side of getting things uploaded. */ SMARTLIST_FOREACH(dirservers, trusted_dir_server_t *, ds, { routerstatus_t *rs = &(ds->fake_status); if (post_to_v1_only && !ds->is_v1_authority) continue; post_via_tor = purpose_is_private(purpose) || !fascist_firewall_allows_address_dir(ds->addr, ds->dir_port); directory_initiate_command_routerstatus(rs, purpose, post_via_tor, NULL, payload, payload_len); }); } /** Start a connection to a random running directory server, using * connection purpose 'purpose' and requesting 'resource'. * If retry_if_no_servers, then if all the possible servers seem * down, mark them up and try again. */ void directory_get_from_dirserver(uint8_t purpose, const char *resource, int retry_if_no_servers) { routerstatus_t *rs = NULL; or_options_t *options = get_options(); int prefer_authority = server_mode(options) && options->DirPort != 0; int directconn = !purpose_is_private(purpose); int need_v1_support = purpose == DIR_PURPOSE_FETCH_DIR || purpose == DIR_PURPOSE_FETCH_RUNNING_LIST || purpose == DIR_PURPOSE_FETCH_RENDDESC; int need_v2_support = purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS || purpose == DIR_PURPOSE_FETCH_SERVERDESC; if (!options->FetchServerDescriptors && (need_v1_support || need_v2_support)) return; if (directconn) { if (prefer_authority) { /* only ask authdirservers, and don't ask myself */ rs = router_pick_trusteddirserver(need_v1_support, 1, 1, retry_if_no_servers); } if (!rs) { /* anybody with a non-zero dirport will do */ rs = router_pick_directory_server(1, 1, need_v2_support, retry_if_no_servers); if (!rs) { const char *which; if (purpose == DIR_PURPOSE_FETCH_DIR) which = "directory"; else if (purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) which = "status list"; else if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) which = "network status"; else // if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) which = "server descriptors"; log_info(LD_DIR, "No router found for %s; falling back to dirserver list", which); rs = router_pick_trusteddirserver(need_v1_support, 1, 1, retry_if_no_servers); if (!rs) directconn = 0; /* last resort: try routing it via Tor */ } } } if (!directconn) { /* Never use fascistfirewall; we're going via Tor. */ if (purpose == DIR_PURPOSE_FETCH_RENDDESC) { /* only ask authdirservers, any of them will do */ rs = router_pick_trusteddirserver(1, 0, 0, retry_if_no_servers); } else { /* anybody with a non-zero dirport will do. Disregard firewalls. */ rs = router_pick_directory_server(1, 0, need_v2_support, retry_if_no_servers); /* If we have any hope of building an indirect conn, we know some router * descriptors. If (rs==NULL), we can't build circuits anyway, so * there's no point in falling back to the authorities in this case. */ } } if (rs) directory_initiate_command_routerstatus(rs, purpose, !directconn, resource, NULL, 0); else { log_notice(LD_DIR, "No running dirservers known. Will try again later. " "(purpose %d)", purpose); if (!purpose_is_private(purpose)) { /* remember we tried them all and failed. */ directory_all_unreachable(time(NULL)); } } } /** Launch a new connection to the directory server router to upload or * download a service or rendezvous descriptor. purpose determines what * kind of directory connection we're launching, and must be one of * DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC}. * * When uploading, payload and payload_len determine the content * of the HTTP post. Otherwise, payload should be NULL. * * When fetching a rendezvous descriptor, resource is the service ID we * want to fetch. */ void directory_initiate_command_router(routerinfo_t *router, uint8_t purpose, int private_connection, const char *resource, const char *payload, size_t payload_len) { directory_initiate_command(router->address, router->addr, router->dir_port, router->platform, router->cache_info.identity_digest, purpose, private_connection, resource, payload, payload_len); } /** Launch a new connection to the directory server status to upload or * download a service or rendezvous descriptor. purpose determines what * kind of directory connection we're launching, and must be one of * DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC}. * * When uploading, payload and payload_len determine the content * of the HTTP post. Otherwise, payload should be NULL. * * When fetching a rendezvous descriptor, resource is the service ID we * want to fetch. */ void directory_initiate_command_routerstatus(routerstatus_t *status, uint8_t purpose, int private_connection, const char *resource, const char *payload, size_t payload_len) { const char *platform = NULL; routerinfo_t *router; char address_buf[INET_NTOA_BUF_LEN]; struct in_addr in; const char *address; if ((router = router_get_by_digest(status->identity_digest))) { platform = router->platform; address = router->address; } else { in.s_addr = htonl(status->addr); tor_inet_ntoa(&in, address_buf, sizeof(address_buf)); address = address_buf; } directory_initiate_command(address, status->addr, status->dir_port, platform, status->identity_digest, purpose, private_connection, resource, payload, payload_len); } /** Called when we are unable to complete the client's request to a * directory server: Mark the router as down and try again if possible. */ void connection_dir_request_failed(connection_t *conn) { if (router_digest_is_me(conn->identity_digest)) return; /* this was a test fetch. don't retry. */ router_set_status(conn->identity_digest, 0); /* don't try him again */ if (conn->purpose == DIR_PURPOSE_FETCH_DIR || conn->purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) { log_info(LD_DIR, "Giving up on directory server at '%s:%d'; retrying", conn->address, conn->port); directory_get_from_dirserver(conn->purpose, NULL, 0 /* don't retry_if_no_servers */); } else if (conn->purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) { log_info(LD_DIR, "Giving up on directory server at '%s'; retrying", conn->address); connection_dir_download_networkstatus_failed(conn); } else if (conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC) { log_info(LD_DIR, "Giving up on directory server at '%s'; retrying", conn->address); connection_dir_download_routerdesc_failed(conn); } } /** Called when an attempt to download one or more network status * documents on connection conn failed. Decide whether to * retry the fetch now, later, or never. */ static void connection_dir_download_networkstatus_failed(connection_t *conn) { if (!conn->requested_resource) { /* We never reached directory_send_command, which means that we never * opened a network connection. Either we're out of sockets, or the * network is down. Either way, retrying would be pointless. */ return; } if (!strcmpstart(conn->requested_resource, "all")) { /* We're a non-authoritative directory cache; try again. */ smartlist_t *trusted_dirs = router_get_trusted_dir_servers(); SMARTLIST_FOREACH(trusted_dirs, trusted_dir_server_t *, ds, ++ds->n_networkstatus_failures); directory_get_from_dirserver(conn->purpose, "all.z", 0 /* don't retry_if_no_servers */); } else if (!strcmpstart(conn->requested_resource, "fp/")) { /* We were trying to download by fingerprint; mark them all as having * failed, and possibly retry them later.*/ smartlist_t *failed = smartlist_create(); dir_split_resource_into_fingerprints(conn->requested_resource+3, failed, NULL, 0); if (smartlist_len(failed)) { dir_networkstatus_download_failed(failed); SMARTLIST_FOREACH(failed, char *, cp, tor_free(cp)); } smartlist_free(failed); } } /** Called when an attempt to download one or more router descriptors * on connection conn failed. */ static void connection_dir_download_routerdesc_failed(connection_t *conn) { /* Try again. No need to increment the failure count for routerdescs, since * it's not their fault.*/ /* update_router_descriptor_downloads(time(NULL)); */ (void) conn; /* XXXX Why did the above get commented out? -NM */ } /** Helper for directory_initiate_command_(router|trusted_dir): send the * command to a server whose address is address, whose IP is * addr, whose directory port is dir_port, whose tor version is * platform, and whose identity key digest is digest. The * platform argument is optional; the others are required. */ static void directory_initiate_command(const char *address, uint32_t addr, uint16_t dir_port, const char *platform, const char *digest, uint8_t purpose, int private_connection, const char *resource, const char *payload, size_t payload_len) { connection_t *conn; tor_assert(address); tor_assert(addr); tor_assert(dir_port); tor_assert(digest); switch (purpose) { case DIR_PURPOSE_FETCH_DIR: log_debug(LD_DIR,"initiating directory fetch"); break; case DIR_PURPOSE_FETCH_RENDDESC: log_debug(LD_DIR,"initiating hidden-service descriptor fetch"); break; case DIR_PURPOSE_UPLOAD_DIR: log_debug(LD_OR,"initiating server descriptor upload"); break; case DIR_PURPOSE_UPLOAD_RENDDESC: log_debug(LD_REND,"initiating hidden-service descriptor upload"); break; case DIR_PURPOSE_FETCH_RUNNING_LIST: log_debug(LD_DIR,"initiating running-routers fetch"); break; case DIR_PURPOSE_FETCH_NETWORKSTATUS: log_debug(LD_DIR,"initiating network-status fetch"); break; case DIR_PURPOSE_FETCH_SERVERDESC: log_debug(LD_DIR,"initiating server descriptor fetch"); break; default: log_err(LD_BUG, "Unrecognized directory connection purpose."); tor_assert(0); } conn = connection_new(CONN_TYPE_DIR); /* set up conn so it's got all the data we need to remember */ conn->addr = addr; conn->port = dir_port; conn->address = tor_strdup(address); memcpy(conn->identity_digest, digest, DIGEST_LEN); conn->purpose = purpose; /* give it an initial state */ conn->state = DIR_CONN_STATE_CONNECTING; if (!private_connection) { /* then we want to connect directly */ if (get_options()->HttpProxy) { addr = get_options()->HttpProxyAddr; dir_port = get_options()->HttpProxyPort; } switch (connection_connect(conn, conn->address, addr, dir_port)) { case -1: connection_dir_request_failed(conn); /* retry if we want */ connection_free(conn); return; case 1: conn->state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */ /* fall through */ case 0: /* queue the command on the outbuf */ directory_send_command(conn, platform, purpose, resource, payload, payload_len); connection_watch_events(conn, EV_READ | EV_WRITE); /* writable indicates finish, readable indicates broken link, error indicates broken link in windowsland. */ } } else { /* we want to connect via tor */ /* make an AP connection * populate it and add it at the right state * socketpair and hook up both sides */ conn->s = connection_ap_make_bridge(conn->address, conn->port); if (conn->s < 0) { log_warn(LD_NET,"Making AP bridge to dirserver failed."); connection_mark_for_close(conn); return; } if (connection_add(conn) < 0) { log_warn(LD_NET,"Unable to add AP bridge to dirserver."); connection_mark_for_close(conn); return; } conn->state = DIR_CONN_STATE_CLIENT_SENDING; /* queue the command on the outbuf */ directory_send_command(conn, platform, purpose, resource, payload, payload_len); connection_watch_events(conn, EV_READ | EV_WRITE); } } /** Queue an appropriate HTTP command on conn-\>outbuf. The other args * are as in directory_initiate_command. */ static void directory_send_command(connection_t *conn, const char *platform, int purpose, const char *resource, const char *payload, size_t payload_len) { char proxystring[256]; char proxyauthstring[256]; char hoststring[128]; char *url; char request[8192]; const char *httpcommand = NULL; size_t len; tor_assert(conn); tor_assert(conn->type == CONN_TYPE_DIR); tor_free(conn->requested_resource); if (resource) conn->requested_resource = tor_strdup(resource); /* come up with a string for which Host: we want */ if (conn->port == 80) { strlcpy(hoststring, conn->address, sizeof(hoststring)); } else { tor_snprintf(hoststring, sizeof(hoststring),"%s:%d", conn->address, conn->port); } /* come up with some proxy lines, if we're using one. */ if (get_options()->HttpProxy) { char *base64_authenticator=NULL; const char *authenticator = get_options()->HttpProxyAuthenticator; tor_snprintf(proxystring, sizeof(proxystring),"http://%s", hoststring); if (authenticator) { base64_authenticator = alloc_http_authenticator(authenticator); if (!base64_authenticator) log_warn(LD_BUG, "Encoding http authenticator failed"); } if (base64_authenticator) { tor_snprintf(proxyauthstring, sizeof(proxyauthstring), "\r\nProxy-Authorization: Basic %s", base64_authenticator); tor_free(base64_authenticator); } else { proxyauthstring[0] = 0; } } else { proxystring[0] = 0; proxyauthstring[0] = 0; } switch (purpose) { case DIR_PURPOSE_FETCH_DIR: tor_assert(!resource); tor_assert(!payload); log_debug(LD_DIR, "Asking for compressed directory from server running %s", platform?escaped(platform):""); httpcommand = "GET"; url = tor_strdup("/tor/dir.z"); break; case DIR_PURPOSE_FETCH_RUNNING_LIST: tor_assert(!resource); tor_assert(!payload); httpcommand = "GET"; url = tor_strdup("/tor/running-routers"); break; case DIR_PURPOSE_FETCH_NETWORKSTATUS: httpcommand = "GET"; len = strlen(resource)+32; url = tor_malloc(len); tor_snprintf(url, len, "/tor/status/%s", resource); break; case DIR_PURPOSE_FETCH_SERVERDESC: httpcommand = "GET"; len = strlen(resource)+32; url = tor_malloc(len); tor_snprintf(url, len, "/tor/server/%s", resource); break; case DIR_PURPOSE_UPLOAD_DIR: tor_assert(!resource); tor_assert(payload); httpcommand = "POST"; url = tor_strdup("/tor/"); break; case DIR_PURPOSE_FETCH_RENDDESC: tor_assert(resource); tor_assert(!payload); /* this must be true or we wouldn't be doing the lookup */ tor_assert(strlen(resource) <= REND_SERVICE_ID_LEN); /* This breaks the function abstraction. */ strlcpy(conn->rend_query, resource, sizeof(conn->rend_query)); httpcommand = "GET"; /* Request the most recent versioned descriptor. */ // (XXXX We were going to switch this to fetch rendezvous1 descriptors, // but that never got testing, and it wasn't a good design.) len = strlen(resource)+32; url = tor_malloc(len); tor_snprintf(url, len, "/tor/rendezvous/%s", resource); break; case DIR_PURPOSE_UPLOAD_RENDDESC: tor_assert(!resource); tor_assert(payload); httpcommand = "POST"; url = tor_strdup("/tor/rendezvous/publish"); break; default: tor_assert(0); return; } if (strlen(proxystring) + strlen(url) >= 4096) { log_warn(LD_BUG, "Bug: squid does not like URLs longer than 4095 bytes, this " "one is %d bytes long: %s%s", (int)(strlen(proxystring) + strlen(url)), proxystring, url); } tor_snprintf(request, sizeof(request), "%s %s", httpcommand, proxystring); connection_write_to_buf(request, strlen(request), conn); connection_write_to_buf(url, strlen(url), conn); tor_free(url); if (!strcmp(httpcommand, "GET") && !payload) { tor_snprintf(request, sizeof(request), " HTTP/1.0\r\nHost: %s%s\r\n\r\n", hoststring, proxyauthstring); } else { tor_snprintf(request, sizeof(request), " HTTP/1.0\r\nContent-Length: %lu\r\nHost: %s%s\r\n\r\n", payload ? (unsigned long)payload_len : 0, hoststring, proxyauthstring); } connection_write_to_buf(request, strlen(request), conn); if (payload) { /* then send the payload afterwards too */ connection_write_to_buf(payload, payload_len, conn); } } /** Parse an HTTP request string headers of the form * \verbatim * "\%s [http[s]://]\%s HTTP/1..." * \endverbatim * If it's well-formed, strdup the second \%s into *url, and * null-terminate it. If the url doesn't start with "/tor/", rewrite it * so it does. Return 0. * Otherwise, return -1. */ static int parse_http_url(char *headers, char **url) { char *s, *start, *tmp; s = (char *)eat_whitespace_no_nl(headers); if (!*s) return -1; s = (char *)find_whitespace(s); /* get past GET/POST */ if (!*s) return -1; s = (char *)eat_whitespace_no_nl(s); if (!*s) return -1; start = s; /* this is it, assuming it's valid */ s = (char *)find_whitespace(start); if (!*s) return -1; /* tolerate the http[s] proxy style of putting the hostname in the url */ if (s-start >= 4 && !strcmpstart(start,"http")) { tmp = start + 4; if (*tmp == 's') tmp++; if (s-tmp >= 3 && !strcmpstart(tmp,"://")) { tmp = strchr(tmp+3, '/'); if (tmp && tmp < s) { log_debug(LD_DIR,"Skipping over 'http[s]://hostname' string"); start = tmp; } } } if (s-start < 5 || strcmpstart(start,"/tor/")) { /* need to rewrite it */ *url = tor_malloc(s - start + 5); strlcpy(*url,"/tor", s-start+5); strlcat((*url)+4, start, s-start+1); } else { *url = tor_strndup(start, s-start); } return 0; } /** Return a copy of the first HTTP header in headers whose key is * which. The key should be given with a terminating colon and space; * this function copies everything after, up to but not including the * following \\r\\n. */ static char * http_get_header(const char *headers, const char *which) { const char *cp = headers; while (cp) { if (!strcmpstart(cp, which)) { char *eos; cp += strlen(which); if ((eos = strchr(cp,'\r'))) return tor_strndup(cp, eos-cp); else return tor_strdup(cp); } cp = strchr(cp, '\n'); if (cp) ++cp; } return NULL; } /** Allocate and return a string describing the source of an HTTP request with * headers headers received on conn. The format is either * "'1.2.3.4'", or "'1.2.3.4' (forwarded for '5.6.7.8')". */ static char * http_get_origin(const char *headers, connection_t *conn) { char *fwd; fwd = http_get_header(headers, "Forwarded-For: "); if (!fwd) fwd = http_get_header(headers, "X-Forwarded-For: "); if (fwd) { size_t len = strlen(fwd)+strlen(conn->address)+32; char *result = tor_malloc(len); tor_snprintf(result, len, "'%s' (forwarded for %s)", conn->address, escaped(fwd)); tor_free(fwd); return result; } else { size_t len = strlen(conn->address)+3; char *result = tor_malloc(len); tor_snprintf(result, len, "'%s'", conn->address); return result; } } /** Parse an HTTP response string headers of the form * \verbatim * "HTTP/1.\%d \%d\%s\r\n...". * \endverbatim * * If it's well-formed, assign the status code to *code and * return 0. Otherwise, return -1. * * On success: If date is provided, set *date to the Date * header in the http headers, or 0 if no such header is found. If * compression is provided, set *compression to the * compression method given in the Content-Encoding header, or 0 if no * such header is found, or -1 if the value of the header is not * recognized. If reason is provided, strdup the reason string * into it. */ int parse_http_response(const char *headers, int *code, time_t *date, int *compression, char **reason) { int n1, n2; char datestr[RFC1123_TIME_LEN+1]; smartlist_t *parsed_headers; tor_assert(headers); tor_assert(code); while (TOR_ISSPACE(*headers)) headers++; /* tolerate leading whitespace */ if (sscanf(headers, "HTTP/1.%d %d", &n1, &n2) < 2 || (n1 != 0 && n1 != 1) || (n2 < 100 || n2 >= 600)) { log_warn(LD_HTTP,"Failed to parse header %s",escaped(headers)); return -1; } *code = n2; parsed_headers = smartlist_create(); smartlist_split_string(parsed_headers, headers, "\n", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); if (reason) { smartlist_t *status_line_elements = smartlist_create(); tor_assert(smartlist_len(parsed_headers)); smartlist_split_string(status_line_elements, smartlist_get(parsed_headers, 0), " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 3); tor_assert(smartlist_len(status_line_elements) <= 3); if (smartlist_len(status_line_elements) == 3) { *reason = smartlist_get(status_line_elements, 2); smartlist_set(status_line_elements, 2, NULL); /* Prevent free */ } SMARTLIST_FOREACH(status_line_elements, char *, cp, tor_free(cp)); smartlist_free(status_line_elements); } if (date) { *date = 0; SMARTLIST_FOREACH(parsed_headers, const char *, s, if (!strcmpstart(s, "Date: ")) { strlcpy(datestr, s+6, sizeof(datestr)); /* This will do nothing on failure, so we don't need to check the result. We shouldn't warn, since there are many other valid date formats besides the one we use. */ parse_rfc1123_time(datestr, date); break; }); } if (compression) { const char *enc = NULL; SMARTLIST_FOREACH(parsed_headers, const char *, s, if (!strcmpstart(s, "Content-Encoding: ")) { enc = s+18; break; }); if (!enc || !strcmp(enc, "identity")) { *compression = 0; } else if (!strcmp(enc, "deflate") || !strcmp(enc, "x-deflate")) { *compression = ZLIB_METHOD; } else if (!strcmp(enc, "gzip") || !strcmp(enc, "x-gzip")) { *compression = GZIP_METHOD; } else { log_info(LD_HTTP, "Unrecognized content encoding: %s. Trying to deal.", escaped(enc)); *compression = -1; } } SMARTLIST_FOREACH(parsed_headers, char *, s, tor_free(s)); smartlist_free(parsed_headers); return 0; } /** Return true iff body doesn't start with a plausible router or * running-list or directory opening. This is a sign of possible compression. **/ static int body_is_plausible(const char *body, size_t len, int purpose) { int i; if (len == 0) return 1; /* empty bodies don't need decompression */ if (len < 32) return 0; if (purpose != DIR_PURPOSE_FETCH_RENDDESC) { if (!strcmpstart(body,"router") || !strcmpstart(body,"signed-directory") || !strcmpstart(body,"network-status") || !strcmpstart(body,"running-routers")) return 1; for (i=0;i<32;++i) { if (!TOR_ISPRINT(body[i]) && !TOR_ISSPACE(body[i])) return 0; } return 1; } else { return 1; } } /** We are a client, and we've finished reading the server's * response. Parse and it and act appropriately. * * If we're still happy with using this directory server in the future, return * 0. Otherwise return -1; and the caller should consider trying the request * again. * * The caller will take care of marking the connection for close. */ static int connection_dir_client_reached_eof(connection_t *conn) { char *body; char *headers; char *reason = NULL; size_t body_len=0, orig_len=0; int status_code; time_t now, date_header=0; int delta; int compression; int plausible; int skewed=0; int allow_partial = conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC; int was_compressed=0; switch (fetch_from_buf_http(conn->inbuf, &headers, MAX_HEADERS_SIZE, &body, &body_len, MAX_DIR_SIZE, allow_partial)) { case -1: /* overflow */ log_warn(LD_PROTOCOL, "'fetch' response too large (server '%s:%d'). Closing.", conn->address, conn->port); return -1; case 0: log_info(LD_HTTP, "'fetch' response not all here, but we're at eof. Closing."); return -1; /* case 1, fall through */ } orig_len = body_len; if (parse_http_response(headers, &status_code, &date_header, &compression, &reason) < 0) { log_warn(LD_HTTP,"Unparseable headers (server '%s:%d'). Closing.", conn->address, conn->port); tor_free(body); tor_free(headers); return -1; } if (!reason) reason = tor_strdup("[no reason given]"); log_debug(LD_DIR, "Received response from directory server '%s:%d': %d %s", conn->address, conn->port, status_code, escaped(reason)); if (date_header > 0) { now = time(NULL); delta = now-date_header; if (abs(delta)>ALLOW_DIRECTORY_TIME_SKEW) { log_fn(router_digest_is_trusted_dir(conn->identity_digest) ? LOG_WARN : LOG_INFO, LD_HTTP, "Received directory with skewed time (server '%s:%d'): " "we are %d minutes %s, or the directory is %d minutes %s.", conn->address, conn->port, abs(delta)/60, delta>0 ? "ahead" : "behind", abs(delta)/60, delta>0 ? "behind" : "ahead"); skewed = 1; /* don't check the recommended-versions line */ } else { log_debug(LD_HTTP, "Time on received directory is within tolerance; " "we are %d seconds skewed. (That's okay.)", delta); } } if (status_code == 503) { log_info(LD_DIR,"Received http status code %d (%s) from server " "'%s:%d'. I'll try again soon.", status_code, escaped(reason), conn->address, conn->port); tor_free(body); tor_free(headers); tor_free(reason); return -1; } plausible = body_is_plausible(body, body_len, conn->purpose); if (compression || !plausible) { char *new_body = NULL; size_t new_len = 0; int guessed = detect_compression_method(body, body_len); if (compression <= 0 || guessed != compression) { /* Tell the user if we don't believe what we're told about compression.*/ const char *description1, *description2; if (compression == ZLIB_METHOD) description1 = "as deflated"; else if (compression == GZIP_METHOD) description1 = "as gzipped"; else if (compression == 0) description1 = "as uncompressed"; else description1 = "with an unknown Content-Encoding"; if (guessed == ZLIB_METHOD) description2 = "deflated"; else if (guessed == GZIP_METHOD) description2 = "gzipped"; else if (!plausible) description2 = "confusing binary junk"; else description2 = "uncompressed"; log_info(LD_HTTP, "HTTP body from server '%s:%d' was labeled %s, " "but it seems to be %s.%s", conn->address, conn->port, description1, description2, (compression>0 && guessed>0)?" Trying both.":""); } /* Try declared compression first if we can. */ if (compression > 0) tor_gzip_uncompress(&new_body, &new_len, body, body_len, compression, allow_partial, LOG_PROTOCOL_WARN); /* Okay, if that didn't work, and we think that it was compressed * differently, try that. */ if (!new_body && guessed > 0 && compression != guessed) tor_gzip_uncompress(&new_body, &new_len, body, body_len, guessed, allow_partial, LOG_PROTOCOL_WARN); /* If we're pretty sure that we have a compressed directory, and * we didn't manage to uncompress it, then warn and bail. */ if (!plausible && !new_body) { log_fn(LOG_PROTOCOL_WARN, LD_HTTP, "Unable to decompress HTTP body (server '%s:%d').", conn->address, conn->port); tor_free(body); tor_free(headers); tor_free(reason); return -1; } if (new_body) { tor_free(body); body = new_body; body_len = new_len; was_compressed = 1; } } if (conn->purpose == DIR_PURPOSE_FETCH_DIR) { /* fetch/process the directory to cache it. */ log_info(LD_DIR,"Received directory (size %d) from server '%s:%d'", (int)body_len, conn->address, conn->port); if (status_code != 200) { log_warn(LD_DIR,"Received http status code %d (%s) from server " "'%s:%d'. I'll try again soon.", status_code, escaped(reason), conn->address, conn->port); tor_free(body); tor_free(headers); tor_free(reason); return -1; } if (router_parse_directory(body) < 0) { log_notice(LD_DIR,"I failed to parse the directory I fetched from " "'%s:%d'. Ignoring.", conn->address, conn->port); } note_request(was_compressed?"dl/dir.z":"dl/dir", orig_len); } if (conn->purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) { /* just update our list of running routers, if this list is new info */ log_info(LD_DIR,"Received running-routers list (size %d)", (int)body_len); if (status_code != 200) { log_warn(LD_DIR,"Received http status code %d (%s) from server " "'%s:%d'. I'll try again soon.", status_code, escaped(reason), conn->address, conn->port); tor_free(body); tor_free(headers); tor_free(reason); return -1; } if (router_parse_runningrouters(body)<0) { log_warn(LD_DIR, "Bad running-routers from server '%s:%d'. I'll try again soon.", conn->address, conn->port); tor_free(body); tor_free(headers); tor_free(reason); return -1; } note_request(was_compressed?"dl/running-routers.z": "dl/running-routers", orig_len); } if (conn->purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) { smartlist_t *which = NULL; char *cp; log_info(LD_DIR,"Received networkstatus objects (size %d) from server " "'%s:%d'",(int) body_len, conn->address, conn->port); if (status_code != 200) { log_warn(LD_DIR, "Received http status code %d (%s) from server " "'%s:%d' while fetching \"/tor/status/%s\". I'll try again soon.", status_code, escaped(reason), conn->address, conn->port, conn->requested_resource); tor_free(body); tor_free(headers); tor_free(reason); connection_dir_download_networkstatus_failed(conn); return -1; } note_request(was_compressed?"dl/status.z":"dl/status", orig_len); if (conn->requested_resource && !strcmpstart(conn->requested_resource,"fp/")) { which = smartlist_create(); dir_split_resource_into_fingerprints(conn->requested_resource+3, which, NULL, 0); } else if (conn->requested_resource && !strcmpstart(conn->requested_resource, "all")) { which = smartlist_create(); SMARTLIST_FOREACH(router_get_trusted_dir_servers(), trusted_dir_server_t *, ds, { char *cp = tor_malloc(HEX_DIGEST_LEN+1); base16_encode(cp, HEX_DIGEST_LEN+1, ds->digest, DIGEST_LEN); smartlist_add(which, cp); }); } cp = body; while (*cp) { char *next = strstr(cp, "\nnetwork-status-version"); if (next) next[1] = '\0'; /* learn from it, and then remove it from 'which' */ if (router_set_networkstatus(cp, time(NULL), NS_FROM_DIR, which)<0) break; if (next) { next[1] = 'n'; cp = next+1; } else break; } routers_update_all_from_networkstatus(); /*launches router downloads*/ directory_info_has_arrived(time(NULL), 0); if (which) { if (smartlist_len(which)) { dir_networkstatus_download_failed(which); } SMARTLIST_FOREACH(which, char *, cp, tor_free(cp)); smartlist_free(which); } } if (conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC) { smartlist_t *which = NULL; int n_asked_for = 0; log_info(LD_DIR,"Received server info (size %d) from server '%s:%d'", (int)body_len, conn->address, conn->port); note_request(was_compressed?"dl/server.z":"dl/server", orig_len); if (conn->requested_resource && !strcmpstart(conn->requested_resource,"d/")) { which = smartlist_create(); dir_split_resource_into_fingerprints(conn->requested_resource+2, which, NULL, 0); n_asked_for = smartlist_len(which); } if (status_code != 200) { int dir_okay = status_code == 404 || (status_code == 400 && !strcmp(reason, "Servers unavailable.")); /* 404 means that it didn't have them; no big deal. * Older (pre-0.1.1.8) servers said 400 Servers unavailable instead. */ log_fn(dir_okay ? LOG_INFO : LOG_WARN, LD_DIR, "Received http status code %d (%s) from server '%s:%d' " "while fetching \"/tor/server/%s\". I'll try again soon.", status_code, escaped(reason), conn->address, conn->port, conn->requested_resource); if (!which) { connection_dir_download_routerdesc_failed(conn); } else { dir_routerdesc_download_failed(which); SMARTLIST_FOREACH(which, char *, cp, tor_free(cp)); smartlist_free(which); } tor_free(body); tor_free(headers); tor_free(reason); return dir_okay ? 0 : -1; } /* Learn the routers, assuming we requested by fingerprint or "all". * Right now, we only use "authority" to fetch ourself, so we don't want * to risk replacing ourself with a router running at the addr:port we * think we have. */ if (which || (conn->requested_resource && !strcmpstart(conn->requested_resource, "all"))) { /* as we learn from them, we remove them from 'which' */ router_load_routers_from_string(body, 0, which); directory_info_has_arrived(time(NULL), 0); } if (which) { /* mark remaining ones as failed */ log_info(LD_DIR, "Received %d/%d routers requested from %s:%d", n_asked_for-smartlist_len(which), n_asked_for, conn->address, (int)conn->port); if (smartlist_len(which)) { dir_routerdesc_download_failed(which); } SMARTLIST_FOREACH(which, char *, cp, tor_free(cp)); smartlist_free(which); } if (conn->requested_resource && !strcmpstart(conn->requested_resource,"authority")) { /* this might have been a dirport reachability test. see if it is. */ routerinfo_t *me = router_get_my_routerinfo(); if (me && router_digest_is_me(conn->identity_digest) && me->addr == conn->addr && me->dir_port == conn->port) router_dirport_found_reachable(); } } if (conn->purpose == DIR_PURPOSE_UPLOAD_DIR) { switch (status_code) { case 200: log_info(LD_GENERAL,"eof (status 200) after uploading server " "descriptor: finished."); break; case 400: log_warn(LD_GENERAL,"http status 400 (%s) response from " "dirserver '%s:%d'. Please correct.", escaped(reason), conn->address, conn->port); break; case 403: log_warn(LD_GENERAL, "http status 403 (%s) response from dirserver " "'%s:%d'. Is your clock skewed? Have you mailed us your key " "fingerprint? Are you using the right key? Are you using a " "private IP address? See http://tor.eff.org/doc/" "tor-doc-server.html",escaped(reason), conn->address, conn->port); break; default: log_warn(LD_GENERAL, "http status %d (%s) reason unexpected (server '%s:%d').", status_code, escaped(reason), conn->address, conn->port); break; } /* return 0 in all cases, since we don't want to mark any * dirservers down just because they don't like us. */ } if (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC) { log_info(LD_REND,"Received rendezvous descriptor (size %d, status %d " "(%s))", (int)body_len, status_code, escaped(reason)); switch (status_code) { case 200: if (rend_cache_store(body, body_len) < 0) { log_warn(LD_REND,"Failed to store rendezvous descriptor."); /* alice's ap_stream will notice when connection_mark_for_close * cleans it up */ } else { /* success. notify pending connections about this. */ conn->purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC; rend_client_desc_here(conn->rend_query); } break; case 404: /* not there. pending connections will be notified when * connection_mark_for_close cleans it up. */ break; case 400: log_warn(LD_REND, "http status 400 (%s). Dirserver didn't like our " "rendezvous query?", escaped(reason)); break; default: log_warn(LD_REND,"http status %d (%s) response unexpected (server " "'%s:%d').", status_code, escaped(reason), conn->address, conn->port); break; } } if (conn->purpose == DIR_PURPOSE_UPLOAD_RENDDESC) { switch (status_code) { case 200: log_info(LD_REND, "Uploading rendezvous descriptor: finished with status " "200 (%s)", escaped(reason)); break; case 400: log_warn(LD_REND,"http status 400 (%s) response from dirserver " "'%s:%d'. Malformed rendezvous descriptor?", escaped(reason), conn->address, conn->port); break; default: log_warn(LD_REND,"http status %d (%s) response unexpected (server " "'%s:%d').", status_code, escaped(reason), conn->address, conn->port); break; } } tor_free(body); tor_free(headers); tor_free(reason); return 0; } /** Called when a directory connection reaches EOF */ int connection_dir_reached_eof(connection_t *conn) { int retval; if (conn->state != DIR_CONN_STATE_CLIENT_READING) { log_info(LD_HTTP,"conn reached eof, not reading. Closing."); connection_close_immediate(conn); /* error: give up on flushing */ connection_mark_for_close(conn); return -1; } retval = connection_dir_client_reached_eof(conn); if (retval == 0) /* success */ conn->state = DIR_CONN_STATE_CLIENT_FINISHED; connection_mark_for_close(conn); return retval; } /** Read handler for directory connections. (That's connections to * directory servers and connections at directory servers.) */ int connection_dir_process_inbuf(connection_t *conn) { tor_assert(conn); tor_assert(conn->type == CONN_TYPE_DIR); /* Directory clients write, then read data until they receive EOF; * directory servers read data until they get an HTTP command, then * write their response (when it's finished flushing, they mark for * close). */ /* If we're on the dirserver side, look for a command. */ if (conn->state == DIR_CONN_STATE_SERVER_COMMAND_WAIT) { if (directory_handle_command(conn) < 0) { connection_mark_for_close(conn); return -1; } return 0; } /* XXX for READ states, might want to make sure inbuf isn't too big */ if (!conn->inbuf_reached_eof) log_debug(LD_HTTP,"Got data, not eof. Leaving on inbuf."); return 0; } /** Create an http response for the client conn out of * status and reason_phrase. Write it to conn. */ static void write_http_status_line(connection_t *conn, int status, const char *reason_phrase) { char buf[256]; if (tor_snprintf(buf, sizeof(buf), "HTTP/1.0 %d %s\r\n\r\n", status, reason_phrase) < 0) { log_warn(LD_BUG,"Bug: status line too long."); return; } connection_write_to_buf(buf, strlen(buf), conn); } /** Helper function: return 1 if there are any dir conns of purpose * purpose that are going elsewhere than our own ORPort/Dirport. * Else return 0. */ static int already_fetching_directory(int purpose) { int i, n; connection_t *conn; connection_t **carray; get_connection_array(&carray,&n); for (i=0;itype == CONN_TYPE_DIR && conn->purpose == purpose && !conn->marked_for_close && !router_digest_is_me(conn->identity_digest)) return 1; } return 0; } #undef INSTRUMENT_DOWNLOADS #ifdef INSTRUMENT_DOWNLOADS /** DOCDOC */ static strmap_t *request_bytes_map = NULL; /** DOCDOC */ static void note_request(const char *key, size_t bytes) { uint64_t *n; if (!request_bytes_map) request_bytes_map = strmap_new(); n = strmap_get(request_bytes_map, key); if (!n) { n = tor_malloc_zero(sizeof(uint64_t)); strmap_set(request_bytes_map, key, n); } *n += bytes; } /** DOCDOC */ char * directory_dump_request_log(void) { smartlist_t *lines; char tmp[256]; char *result; strmap_iter_t *iter; if (!request_bytes_map) request_bytes_map = strmap_new(); lines = smartlist_create(); for (iter = strmap_iter_init(request_bytes_map); !strmap_iter_done(iter); iter = strmap_iter_next(request_bytes_map, iter)) { const char *key; void *val; uint64_t *n; strmap_iter_get(iter, &key, &val); n = val; tor_snprintf(tmp, sizeof(tmp), "%s "U64_FORMAT"\n", key, U64_PRINTF_ARG(*n)); smartlist_add(lines, tor_strdup(tmp)); } smartlist_sort_strings(lines); result = smartlist_join_strings(lines, "", 0, NULL); SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp)); smartlist_free(lines); return result; } #else static void note_request(const char *key, size_t bytes) { (void)key; (void)bytes; } char * directory_dump_request_log(void) { return tor_strdup("Not supported."); } #endif /** Helper function: called when a dirserver gets a complete HTTP GET * request. Look for a request for a directory or for a rendezvous * service descriptor. On finding one, write a response into * conn-\>outbuf. If the request is unrecognized, send a 400. * Always return 0. */ static int directory_handle_command_get(connection_t *conn, char *headers, char *body, size_t body_len) { size_t dlen; const char *cp; char *url = NULL; char tmp[8192]; char date[RFC1123_TIME_LEN+1]; /* We ignore the body of a GET request. */ (void)body; (void)body_len; log_debug(LD_DIRSERV,"Received GET command."); conn->state = DIR_CONN_STATE_SERVER_WRITING; if (parse_http_url(headers, &url) < 0) { write_http_status_line(conn, 400, "Bad request"); return 0; } log_debug(LD_DIRSERV,"rewritten url as '%s'.", url); if (!strcmp(url,"/tor/") || !strcmp(url,"/tor/dir.z")) { /* dir fetch */ int deflated = !strcmp(url,"/tor/dir.z"); cached_dir_t *d = dirserv_get_directory(); if (!d) { log_notice(LD_DIRSERV,"Client asked for the mirrored directory, but we " "don't have a good one yet. Sending 503 Dir not available."); write_http_status_line(conn, 503, "Directory unavailable"); /* try to get a new one now */ if (!already_fetching_directory(DIR_PURPOSE_FETCH_DIR)) directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1); tor_free(url); return 0; } dlen = deflated ? d->dir_z_len : d->dir_len; if (global_write_bucket_empty()) { log_info(LD_DIRSERV, "Client asked for the mirrored directory, but we've been " "writing too many bytes lately. Sending 503 Dir busy."); write_http_status_line(conn, 503, "Directory busy, try again later"); tor_free(url); return 0; } note_request(url, dlen); tor_free(url); log_debug(LD_DIRSERV,"Dumping %sdirectory to client.", deflated?"deflated ":""); format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: %s\r\nContent-Encoding: %s\r\n\r\n", date, (int)dlen, deflated?"application/octet-stream":"text/plain", deflated?"deflate":"identity"); connection_write_to_buf(tmp, strlen(tmp), conn); conn->cached_dir = d; conn->cached_dir_offset = 0; if (! deflated) conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD); ++d->refcnt; /* Prime the connection with some data. */ conn->dir_refresh_src = DIR_REFRESH_CACHED_DIR; connection_dirserv_flushed_some(conn); return 0; } if (!strcmp(url,"/tor/running-routers") || !strcmp(url,"/tor/running-routers.z")) { /* running-routers fetch */ int deflated = !strcmp(url,"/tor/running-routers.z"); dlen = dirserv_get_runningrouters(&cp, deflated); note_request(url, dlen); tor_free(url); if (!dlen) { /* we failed to create/cache cp */ write_http_status_line(conn, 503, "Directory unavailable"); /* try to get a new one now */ if (!already_fetching_directory(DIR_PURPOSE_FETCH_RUNNING_LIST)) directory_get_from_dirserver(DIR_PURPOSE_FETCH_RUNNING_LIST, NULL, 1); return 0; } format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: %s\r\nContent-Encoding: %s\r\n\r\n", date, (int)dlen, deflated?"application/octet-stream":"text/plain", deflated?"deflate":"identity"); connection_write_to_buf(tmp, strlen(tmp), conn); connection_write_to_buf(cp, strlen(cp), conn); return 0; } if (!strcmpstart(url,"/tor/status/")) { /* v2 network status fetch. */ size_t url_len = strlen(url); int deflated = !strcmp(url+url_len-2, ".z"); smartlist_t *dir_objs = smartlist_create(); const char *request_type = NULL; const char *key = url + strlen("/tor/status/"); if (deflated) url[url_len-2] = '\0'; dirserv_get_networkstatus_v2(dir_objs, key); if (!strcmpstart(key, "fp/")) request_type = deflated?"/tor/status/fp.z":"/tor/status/fp"; else if (!strcmpstart(key, "authority")) request_type = deflated?"/tor/status/authority.z": "/tor/status/authority"; else if (!strcmpstart(key, "all")) request_type = deflated?"/tor/status/all.z":"/tor/status/all"; else request_type = "/tor/status/?"; tor_free(url); if (!smartlist_len(dir_objs)) { /* we failed to create/cache cp */ write_http_status_line(conn, 503, "Network status object unavailable"); smartlist_free(dir_objs); return 0; } dlen = 0; SMARTLIST_FOREACH(dir_objs, cached_dir_t *, d, dlen += deflated?d->dir_z_len:d->dir_len); note_request(request_type,dlen); format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: %s\r\nContent-Encoding: %s\r\n\r\n", date, (int)dlen, deflated?"application/octet-stream":"text/plain", deflated?"deflate":"identity"); connection_write_to_buf(tmp, strlen(tmp), conn); SMARTLIST_FOREACH(dir_objs, cached_dir_t *, d, { if (deflated) connection_write_to_buf(d->dir_z, d->dir_z_len, conn); else connection_write_to_buf(d->dir, d->dir_len, conn); }); smartlist_free(dir_objs); return 0; } if (!strcmpstart(url,"/tor/server/")) { size_t url_len = strlen(url); int deflated = !strcmp(url+url_len-2, ".z"); int res; const char *msg; const char *request_type = NULL; if (deflated) url[url_len-2] = '\0'; conn->fingerprint_stack = smartlist_create(); res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url, &msg); if (!strcmpstart(url, "/tor/server/fp/")) request_type = deflated?"/tor/server/fp.z":"/tor/server/fp"; else if (!strcmpstart(url, "/tor/server/authority")) request_type = deflated?"/tor/server/authority.z": "/tor/server/authority"; else if (!strcmpstart(url, "/tor/server/all")) request_type = deflated?"/tor/server/all.z":"/tor/server/all"; else if (!strcmpstart(url, "/tor/server/d/")) request_type = deflated?"/tor/server/d.z":"/tor/server/d"; else request_type = "/tor/server/?"; if (!strcmpstart(url, "/tor/server/d/")) conn->dir_refresh_src = DIR_REFRESH_SERVER_BY_DIGEST; else conn->dir_refresh_src = DIR_REFRESH_SERVER_BY_FP; tor_free(url); if (res < 0) write_http_status_line(conn, 404, msg); else { format_rfc1123_time(date, time(NULL)); if (deflated) { conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD); /* // note_request(request_type, compressed_len); XXXX */ tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\n" "Content-Type: application/octet-stream\r\n" "Content-Encoding: deflate\r\n\r\n", date); connection_write_to_buf(tmp, strlen(tmp), conn); } else { tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\n" "Content-Type: text/plain\r\n\r\n", date); /* note_request(request_type, len); XXXX */ connection_write_to_buf(tmp, strlen(tmp), conn); } /* Prime the connection with some data. */ connection_dirserv_flushed_some(conn); } return 0; } if (!strcmpstart(url,"/tor/rendezvous/") || !strcmpstart(url,"/tor/rendezvous1/")) { /* rendezvous descriptor fetch */ const char *descp; size_t desc_len; int versioned = !strcmpstart(url,"/tor/rendezvous1/"); const char *query = url+strlen("/tor/rendezvous/")+(versioned?1:0); if (!authdir_mode(get_options())) { /* We don't hand out rend descs. In fact, it could be a security * risk, since rend_cache_lookup_desc() below would provide it * if we're gone to the site recently, and 404 if we haven't. * * Reject. */ write_http_status_line(conn, 400, "Nonauthoritative directory does not " "store rendezvous descriptors"); tor_free(url); return 0; } switch (rend_cache_lookup_desc(query, versioned?-1:0, &descp, &desc_len)) { case 1: /* valid */ format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: application/octet-stream\r\n\r\n", date, (int)desc_len); note_request("/tor/rendezvous?/", desc_len); connection_write_to_buf(tmp, strlen(tmp), conn); /* need to send descp separately, because it may include nuls */ connection_write_to_buf(descp, desc_len, conn); break; case 0: /* well-formed but not present */ write_http_status_line(conn, 404, "Not found"); break; case -1: /* not well-formed */ write_http_status_line(conn, 400, "Bad request"); break; } tor_free(url); return 0; } if (!strcmpstart(url,"/tor/bytes.txt")) { char *bytes = directory_dump_request_log(); size_t len = strlen(bytes); format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: text/plain\r\n\r\n", date, (int)len); connection_write_to_buf(tmp, strlen(tmp), conn); connection_write_to_buf(bytes, len, conn); tor_free(bytes); tor_free(url); return 0; } if (!strcmp(url,"/tor/robots.txt")) { /* /robots.txt will have been rewritten to /tor/robots.txt */ char robots[] = "User-agent: *\r\nDisallow: /\r\n"; size_t len = strlen(robots); format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: text/plain\r\n\r\n", date, (int)len); connection_write_to_buf(tmp, strlen(tmp), conn); connection_write_to_buf(robots, len, conn); tor_free(url); return 0; } if (!strcmp(url,"/tor/dir-all-weaselhack") && (conn->addr == 0x7f000001ul) && authdir_mode(get_options())) { /* XXX until weasel rewrites his scripts XXXX012 */ char *new_directory=NULL; if (dirserv_dump_directory_to_string(&new_directory, get_identity_key(), 1)) { log_warn(LD_BUG, "Error creating full v1 directory."); tor_free(new_directory); write_http_status_line(conn, 503, "Directory unavailable"); return 0; } dlen = strlen(new_directory); format_rfc1123_time(date, time(NULL)); tor_snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\n" "Content-Type: text/plain\r\n" "Content-Encoding: identity\r\n\r\n", date, (int)dlen); connection_write_to_buf(tmp, strlen(tmp), conn); connection_write_to_buf(new_directory, dlen, conn); tor_free(new_directory); tor_free(url); return 0; } /* we didn't recognize the url */ write_http_status_line(conn, 404, "Not found"); tor_free(url); return 0; } /** Helper function: called when a dirserver gets a complete HTTP POST * request. Look for an uploaded server descriptor or rendezvous * service descriptor. On finding one, process it and write a * response into conn-\>outbuf. If the request is unrecognized, send a * 400. Always return 0. */ static int directory_handle_command_post(connection_t *conn, char *headers, char *body, size_t body_len) { char *origin = NULL; char *url = NULL; log_debug(LD_DIRSERV,"Received POST command."); conn->state = DIR_CONN_STATE_SERVER_WRITING; if (!authdir_mode(get_options())) { /* we just provide cached directories; we don't want to * receive anything. */ write_http_status_line(conn, 400, "Nonauthoritative directory does not " "accept posted server descriptors"); return 0; } if (parse_http_url(headers, &url) < 0) { write_http_status_line(conn, 400, "Bad request"); return 0; } log_debug(LD_DIRSERV,"rewritten url as '%s'.", url); origin = http_get_origin(headers, conn); if (!strcmp(url,"/tor/")) { /* server descriptor post */ const char *msg; int r = dirserv_add_descriptor(body, &msg); tor_assert(msg); if (r > 0) dirserv_get_directory(); /* rebuild and write to disk */ switch (r) { case -2: case -1: case 1: log_notice(LD_DIRSERV,"Rejected router descriptor from %s.", origin); /* malformed descriptor, or something wrong */ write_http_status_line(conn, 400, msg); break; case 0: /* accepted but discarded */ case 2: /* accepted */ write_http_status_line(conn, 200, msg); break; } goto done; } if (!strcmpstart(url,"/tor/rendezvous/publish")) { /* rendezvous descriptor post */ if (rend_cache_store(body, body_len) < 0) { // char tmp[1024*2+1]; log_fn(LOG_PROTOCOL_WARN, LD_DIRSERV, "Rejected rend descriptor (length %d) from %s.", (int)body_len, origin); #if 0 if (body_len <= 1024) { base16_encode(tmp, sizeof(tmp), body, body_len); log_notice(LD_DIRSERV,"Body was: %s", escaped(tmp)); } #endif write_http_status_line(conn, 400, "Invalid service descriptor rejected"); } else { write_http_status_line(conn, 200, "Service descriptor stored"); } goto done; } /* we didn't recognize the url */ write_http_status_line(conn, 404, "Not found"); done: tor_free(url); tor_free(origin); return 0; } /** Called when a dirserver receives data on a directory connection; * looks for an HTTP request. If the request is complete, remove it * from the inbuf, try to process it; otherwise, leave it on the * buffer. Return a 0 on success, or -1 on error. */ static int directory_handle_command(connection_t *conn) { char *headers=NULL, *body=NULL; size_t body_len=0; int r; tor_assert(conn); tor_assert(conn->type == CONN_TYPE_DIR); switch (fetch_from_buf_http(conn->inbuf, &headers, MAX_HEADERS_SIZE, &body, &body_len, MAX_BODY_SIZE, 0)) { case -1: /* overflow */ log_warn(LD_DIRSERV, "Invalid input from address '%s'. Closing.", conn->address); return -1; case 0: log_debug(LD_DIRSERV,"command not all here yet."); return 0; /* case 1, fall through */ } //log_debug(LD_DIRSERV,"headers %s, body %s.", headers, body); if (!strncasecmp(headers,"GET",3)) r = directory_handle_command_get(conn, headers, body, body_len); else if (!strncasecmp(headers,"POST",4)) r = directory_handle_command_post(conn, headers, body, body_len); else { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Got headers %s with unknown command. Closing.", escaped(headers)); r = -1; } tor_free(headers); tor_free(body); return r; } /** Write handler for directory connections; called when all data has * been flushed. Close the connection or wait for a response as * appropriate. */ int connection_dir_finished_flushing(connection_t *conn) { tor_assert(conn); tor_assert(conn->type == CONN_TYPE_DIR); switch (conn->state) { case DIR_CONN_STATE_CLIENT_SENDING: log_debug(LD_DIR,"client finished sending command."); conn->state = DIR_CONN_STATE_CLIENT_READING; connection_stop_writing(conn); return 0; case DIR_CONN_STATE_SERVER_WRITING: log_debug(LD_DIRSERV,"Finished writing server response. Closing."); connection_mark_for_close(conn); return 0; default: log_warn(LD_BUG,"Bug: called in unexpected state %d.", conn->state); tor_fragile_assert(); return -1; } return 0; } /** Connected handler for directory connections: begin sending data to the * server */ int connection_dir_finished_connecting(connection_t *conn) { tor_assert(conn); tor_assert(conn->type == CONN_TYPE_DIR); tor_assert(conn->state == DIR_CONN_STATE_CONNECTING); log_debug(LD_HTTP,"Dir connection to router %s:%u established.", conn->address,conn->port); conn->state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */ return 0; } /** Called when one or more networkstatus fetches have failed (with uppercase * fingerprints listed in failed). Mark those fingerprints as having * failed once. */ static void dir_networkstatus_download_failed(smartlist_t *failed) { SMARTLIST_FOREACH(failed, const char *, fp, { char digest[DIGEST_LEN]; trusted_dir_server_t *dir; base16_decode(digest, DIGEST_LEN, fp, strlen(fp)); dir = router_get_trusteddirserver_by_digest(digest); if (dir) ++dir->n_networkstatus_failures; }); } /** Called when one or more routerdesc fetches have failed (with uppercase * fingerprints listed in failed). */ static void dir_routerdesc_download_failed(smartlist_t *failed) { char digest[DIGEST_LEN]; local_routerstatus_t *rs; time_t now = time(NULL); int server = server_mode(get_options()) && get_options()->DirPort; SMARTLIST_FOREACH(failed, const char *, cp, { base16_decode(digest, DIGEST_LEN, cp, strlen(cp)); rs = router_get_combined_status_by_digest(digest); if (!rs || rs->n_download_failures >= MAX_ROUTERDESC_DOWNLOAD_FAILURES) continue; ++rs->n_download_failures; if (server) { switch (rs->n_download_failures) { case 1: rs->next_attempt_at = 0; break; case 2: rs->next_attempt_at = 0; break; case 3: rs->next_attempt_at = now+60; break; case 4: rs->next_attempt_at = now+60; break; case 5: rs->next_attempt_at = now+60*2; break; case 6: rs->next_attempt_at = now+60*5; break; case 7: rs->next_attempt_at = now+60*15; break; default: rs->next_attempt_at = TIME_MAX; break; } } else { switch (rs->n_download_failures) { case 1: rs->next_attempt_at = 0; break; case 2: rs->next_attempt_at = now+60; break; case 3: rs->next_attempt_at = now+60*5; break; case 4: rs->next_attempt_at = now+60*10; break; default: rs->next_attempt_at = TIME_MAX; break; } } if (rs->next_attempt_at == 0) log_debug(LD_DIR, "%s failed %d time(s); I'll try again immediately.", cp, (int)rs->n_download_failures); else if (rs->next_attempt_at < TIME_MAX) log_debug(LD_DIR, "%s failed %d time(s); I'll try again in %d seconds.", cp, (int)rs->n_download_failures, (int)(rs->next_attempt_at-now)); else log_debug(LD_DIR, "%s failed %d time(s); Giving up for a while.", cp, (int)rs->n_download_failures); }); /* update_router_descriptor_downloads(time(NULL)); */ } /* Given a directory resource request, containing zero * or more strings separated by plus signs, followed optionally by ".z", store * the strings, in order, into fp_out. If compressed_out is * non-NULL, set it to 1 if the resource ends in ".z", else set it to 0. If * decode_hex is true, then delete all elements that aren't hex digests, and * decode the rest. */ int dir_split_resource_into_fingerprints(const char *resource, smartlist_t *fp_out, int *compressed_out, int decode_hex) { int old_len; tor_assert(fp_out); old_len = smartlist_len(fp_out); smartlist_split_string(fp_out, resource, "+", 0, 0); if (compressed_out) *compressed_out = 0; if (smartlist_len(fp_out) > old_len) { char *last = smartlist_get(fp_out,smartlist_len(fp_out)-1); size_t last_len = strlen(last); if (last_len > 2 && !strcmp(last+last_len-2, ".z")) { last[last_len-2] = '\0'; if (compressed_out) *compressed_out = 1; } } if (decode_hex) { int i; char *cp, *d = NULL; for (i = old_len; i < smartlist_len(fp_out); ++i) { cp = smartlist_get(fp_out, i); if (strlen(cp) != HEX_DIGEST_LEN) { log_info(LD_DIR, "Skipping digest %s with non-standard length.", escaped(cp)); smartlist_del(fp_out, i--); goto again; } d = tor_malloc_zero(DIGEST_LEN); if (base16_decode(d, DIGEST_LEN, cp, HEX_DIGEST_LEN)<0) { log_info(LD_DIR, "Skipping non-decodable digest %s", escaped(cp)); smartlist_del(fp_out, i--); goto again; } smartlist_set(fp_out, i, d); d = NULL; again: tor_free(cp); tor_free(d); } } return 0; }