int process_url_toolkit(t_session *session, char *toolkit_id, t_toolkit_options *toolkit_options) { int result; if ((result = use_toolkit(session->uri, toolkit_id, toolkit_options)) == UT_ERROR) { return 500; } if (toolkit_options->log_request == false) { session->log_request = false; } if ((toolkit_options->ban > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), toolkit_options->ban, session->config->kick_on_ban); log_system(session, "Client banned because of URL match in UrlToolkit rule"); session->keep_alive = false; #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif return 403; } session->toolkit_fastcgi = toolkit_options->fastcgi_server; if (toolkit_options->new_url != NULL) { if (register_tempdata(&(session->tempdata), toolkit_options->new_url, tc_data) == -1) { free(toolkit_options->new_url); log_error(session, "error registering temporary data"); return 500; } session->uri = toolkit_options->new_url; } if (result == UT_REDIRECT) { if ((session->location = strdup(toolkit_options->new_url)) == NULL) { return -1; } session->cause_of_301 = location; return 301; } if (result == UT_DENY_ACCESS) { log_error(session, "access denied via URL toolkit rule"); return 403; } if (result == UT_EXIT) { return UT_EXIT; } return 0; }
/* Serve the client that connected to the webserver */ static int serve_client(t_session *session) { int result, length, auth_result; char *qmark, chr, *header; t_host *host_record; t_access access; t_deny_body *deny_body; t_req_method request_method; t_ip_addr ip_addr; #ifdef ENABLE_XSLT char *xslt_file; #endif #ifdef ENABLE_TOOLKIT int i; t_toolkit_options toolkit_options; #endif #ifdef ENABLE_RPROXY t_rproxy *rproxy; #endif #ifdef ENABLE_DEBUG session->current_task = "fetch & parse request"; #endif if ((result = fetch_request(session)) != 200) { session->request_method = GET; return result; } else if ((result = parse_request(session, session->header_length + session->content_length)) != 200) { session->request_method = GET; return result; } #ifdef ENABLE_DEBUG session->current_task = "serve client"; #endif session->time = time(NULL); /* Hide reverse proxies */ if (in_iplist(session->config->hide_proxy, &(session->ip_address))) { if (last_forwarded_ip(session->http_headers, &ip_addr) == 0) { if (reposition_client(session, &ip_addr) != -1) { copy_ip(&(session->ip_address), &ip_addr); } } } /* SSH tunneling */ #ifdef ENABLE_RPROXY if (session->request_method == CONNECT) { if (in_iplist(session->config->tunnel_ssh, &(session->ip_address)) == false) { return 405; } #ifdef ENABLE_SSL if (session->binding->use_ssl) { return 405; } #endif if (strcmp(session->request_uri, "localhost:22") != 0) { if (strcmp(session->request_uri, "127.0.0.1:22") != 0) { if (strcmp(session->request_uri, "::1.22") != 0) { return 403; } } } log_system(session, "SSH tunnel requested"); if (tunnel_ssh_connection(session->client_socket) != 0) { log_system(session, "SSH tunnel failed"); } else { log_system(session, "SSH tunnel terminated"); } session->keep_alive = false; return 200; } #endif /* Find host record */ if (session->hostname != NULL) { if (remove_port_from_hostname(session) == -1) { log_error(session, "error removing port from hostname"); return 500; } if ((host_record = get_hostrecord(session->config->first_host, session->hostname, session->binding)) != NULL) { session->host = host_record; #ifdef ENABLE_TOMAHAWK session->last_host = host_record; #endif } } session->host->access_time = session->time; #ifdef ENABLE_SSL /* SSL client authentication */ if (session->binding->use_ssl) { if ((session->host->ca_certificate != NULL) && (ssl_has_peer_cert(&(session->ssl_context)) == false)) { log_error(session, "Missing client SSL certificate"); return 440; } } #endif /* Enforce usage of first hostname */ if (session->host->enforce_first_hostname && (session->hostname != NULL)) { if (**(session->host->hostname.item) != '*') { if (strcmp(session->hostname, *(session->host->hostname.item)) != 0) { session->cause_of_301 = enforce_first_hostname; return 301; } } } /* Enforce usage of SSL */ #ifdef ENABLE_SSL if (session->host->require_ssl && (session->binding->use_ssl == false)) { if ((qmark = strchr(session->uri, '?')) != NULL) { *qmark = '\0'; session->vars = qmark + 1; session->uri_len = strlen(session->uri); } session->cause_of_301 = require_ssl; return 301; } #endif /* Deny matching bodies */ if (session->body != NULL) { chr = *(session->body + session->content_length); *(session->body + session->content_length) = '\0'; deny_body = session->host->deny_body; while (deny_body != NULL) { if (strpcmp(session->body, &(deny_body->pattern)) == 0) { if ((session->config->ban_on_denied_body > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_denied_body, session->config->kick_on_ban); log_system(session, "Client banned because of denied body"); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } log_exploit_attempt(session, "denied body", session->body); #ifdef ENABLE_TOMAHAWK increment_counter(COUNTER_EXPLOIT); #endif #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_exploit(session); monitor_event("Request body denied for %s", session->host->hostname.item[0]); } #endif *(session->body + session->content_length) = chr; return 403; } deny_body = deny_body->next; } *(session->body + session->content_length) = chr; } /* Websocket */ if (session->request_method == GET) { if ((header = get_http_header("Connection:", session->http_headers)) != NULL) { if (strcasestr(header, "upgrade") != NULL) { if ((header = get_http_header("Upgrade:", session->http_headers)) != NULL) { if (strcasecmp(header, "websocket") == 0) { switch (access = allow_client(session)) { case deny: log_error(session, fb_accesslist); return 403; case allow: break; case pwd: case unspecified: if ((auth_result = http_authentication_result(session, access == unspecified)) != 200) { return auth_result; } } session->keep_alive = false; if (forward_to_websocket(session) == -1) { return 500; } return 200; } } } } } #ifdef ENABLE_RPROXY /* Reverse proxy */ rproxy = session->host->rproxy; while (rproxy != NULL) { if (rproxy_match(rproxy, session->request_uri)) { if (rproxy_loop_detected(session->http_headers)) { return 508; } if ((qmark = strchr(session->uri, '?')) != NULL) { *qmark = '\0'; session->vars = qmark + 1; } if (validate_url(session) == false) { return -1; } if ((session->vars != NULL) && (session->host->secure_url)) { if (forbidden_chars_present(session->vars)) { log_error(session, "URL contains forbidden characters"); return 403; } } if (duplicate_host(session) == false) { log_error(session, "duplicate_host() error"); return 500; } if ((result = uri_to_path(session)) != 200) { return result; } if (session->host->ignore_dot_hiawatha == false) { if (load_user_config(session) == -1) { return 500; } } if ((result = copy_directory_settings(session)) != 200) { return result; } switch (access = allow_client(session)) { case deny: log_error(session, fb_accesslist); return 403; case allow: break; case pwd: case unspecified: if ((auth_result = http_authentication_result(session, access == unspecified)) != 200) { return auth_result; } } /* Prevent SQL injection */ if (session->host->prevent_sqli) { result = prevent_sqli(session); if (result == 1) { session->error_cause = ec_SQL_INJECTION; } if (result != 0) { return -1; } } /* Prevent Cross-site Scripting */ if (session->host->prevent_xss != p_no) { if (prevent_xss(session) > 0) { if (session->host->prevent_xss == p_block) { session->error_cause = ec_XSS; return -1; } } } /* Prevent Cross-site Request Forgery */ if (session->host->prevent_csrf != p_no) { if (prevent_csrf(session) > 0) { if (session->host->prevent_csrf == p_block) { session->error_cause = ec_CSRF; return -1; } } } return proxy_request(session, rproxy); } rproxy = rproxy->next; } #endif /* Actions based on request method */ switch (session->request_method) { case TRACE: if (session->binding->enable_trace == false) { return 501; } return handle_trace_request(session); case PUT: case DELETE: if ((session->binding->enable_alter == false) && (session->host->webdav_app == false)) { return 501; } break; case unknown: return 400; case unsupported: if (session->host->webdav_app == false) { return 501; } break; default: break; } if (duplicate_host(session) == false) { log_error(session, "duplicate_host() error"); return 500; } #ifdef ENABLE_TOOLKIT if (session->host->ignore_dot_hiawatha == false) { if (load_user_root_config(session) == -1) { return 500; } } /* URL toolkit */ init_toolkit_options(&toolkit_options); toolkit_options.method = session->method; toolkit_options.website_root = session->host->website_root; toolkit_options.url_toolkit = session->config->url_toolkit; toolkit_options.allow_dot_files = session->host->allow_dot_files; toolkit_options.http_headers = session->http_headers; #ifdef ENABLE_SSL toolkit_options.use_ssl = session->binding->use_ssl; #endif if (((session->request_method != PUT) && (session->request_method != DELETE)) || session->host->webdav_app) { for (i = 0; i < session->host->toolkit_rules.size; i++) { if ((result = use_toolkit(session->uri, session->host->toolkit_rules.item[i], &toolkit_options)) == UT_ERROR) { return 500; } if ((toolkit_options.ban > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), toolkit_options.ban, session->config->kick_on_ban); log_system(session, "Client banned because of URL match in UrlToolkit rule"); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif return 403; } session->toolkit_fastcgi = toolkit_options.fastcgi_server; if (toolkit_options.new_url != NULL) { if (register_tempdata(&(session->tempdata), toolkit_options.new_url, tc_data) == -1) { free(toolkit_options.new_url); log_error(session, "error registering temporary data"); return 500; } session->uri = toolkit_options.new_url; } if (result == UT_REDIRECT) { if ((session->location = strdup(toolkit_options.new_url)) == NULL) { return -1; } session->cause_of_301 = location; return 301; } if (result == UT_DENY_ACCESS) { log_error(session, "access denied via URL toolkit rule"); return 403; } if (toolkit_options.expire > -1) { session->expires = toolkit_options.expire; session->caco_private = toolkit_options.caco_private; } } } #endif /* Find GET data */ if ((qmark = strchr(session->uri, '?')) != NULL) { *qmark = '\0'; session->vars = qmark + 1; } url_decode(session->uri); session->uri_len = strlen(session->uri); if ((session->vars != NULL) && (session->host->secure_url)) { if (forbidden_chars_present(session->vars)) { log_error(session, "URL contains forbidden characters"); return 403; } } if (validate_url(session) == false) { return -1; } if ((result = uri_to_path(session)) != 200) { return result; } /* Load configfile from directories */ if (session->host->ignore_dot_hiawatha == false) { if (load_user_config(session) == -1) { return 500; } } if ((result = copy_directory_settings(session)) != 200) { return result; } switch (access = allow_client(session)) { case deny: log_error(session, fb_accesslist); return 403; case allow: break; case pwd: case unspecified: if ((auth_result = http_authentication_result(session, access == unspecified)) != 200) { return auth_result; } } switch (is_directory(session->file_on_disk)) { case error: return 500; case yes: session->uri_is_dir = true; break; case no: if (((session->request_method != PUT) || session->host->webdav_app) && (session->host->enable_path_info)) { if ((result = get_path_info(session)) != 200) { return result; } } break; case no_access: log_error(session, fb_filesystem); return 403; case not_found: if (session->request_method == DELETE) { return 404; } } #ifdef ENABLE_TOOLKIT if ((session->toolkit_fastcgi == NULL) && session->uri_is_dir) { #else if (session->uri_is_dir) { #endif length = strlen(session->file_on_disk); if (*(session->file_on_disk + length - 1) == '/') { strcpy(session->file_on_disk + length, session->host->start_file); } else { return 301; } } if (get_target_extension(session) == -1) { log_error(session, "error getting extension"); return 500; } if (((session->request_method != PUT) && (session->request_method != DELETE)) || session->host->webdav_app) { check_target_is_cgi(session); } /* Handle request based on request method */ request_method = session->request_method; if (session->host->webdav_app) { if ((request_method == PUT) || (request_method == DELETE)) { request_method = POST; } } switch (request_method) { case GET: case HEAD: if (session->cgi_type != no_cgi) { session->body = NULL; result = execute_cgi(session); #ifdef ENABLE_XSLT } else if ((xslt_file = find_xslt_file(session)) != NULL) { result = handle_xml_file(session, xslt_file); free(xslt_file); #endif } else { result = send_file(session); } if (result == 404) { #ifdef ENABLE_XSLT if ((session->host->show_index != NULL) && (session->uri[session->uri_len - 1] == '/')) { result = show_index(session); } #endif #ifdef ENABLE_MONITOR } else if (session->config->monitor_enabled) { if ((result == 200) && (session->host->monitor_host)) { unlink(session->file_on_disk); } #endif } if ((session->request_method == GET) && (session->cgi_type == no_cgi) && (session->directory != NULL)) { if (session->directory->run_on_download != NULL) { run_program(session, session->directory->run_on_download, result); } } break; case POST: case unsupported: if (session->cgi_type != no_cgi) { result = execute_cgi(session); #ifdef ENABLE_XSLT } else if ((xslt_file = find_xslt_file(session)) != NULL) { result = handle_xml_file(session, xslt_file); free(xslt_file); #endif } else { result = 405; } break; case PUT: result = handle_put_request(session); if (((result == 201) || (result == 204)) && (session->host->run_on_alter != NULL)) { run_program(session, session->host->run_on_alter, result); } break; case DELETE: result = handle_delete_request(session); if ((result == 204) && (session->host->run_on_alter != NULL)) { run_program(session, session->host->run_on_alter, result); } break; case WHEN: send_code(session); break; default: result = 400; } return result; } /* Handle timeout upon sending request */ static void handle_timeout(t_session *session) { if ((session->config->ban_on_timeout > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_timeout, session->config->kick_on_ban); log_system(session, "Client banned because of connection timeout"); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } else { log_system(session, "Timeout while waiting for first request"); } } /* Request has been handled, handle the return code. */ static void handle_request_result(t_session *session, int result) { char *hostname; #ifdef ENABLE_DEBUG session->current_task = "handle request result"; #endif if (result == -1) switch (session->error_cause) { case ec_MAX_REQUESTSIZE: log_system(session, "Maximum request size reached"); session->return_code = 413; send_code(session); if ((session->config->ban_on_max_request_size > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_max_request_size, session->config->kick_on_ban); log_system(session, "Client banned because of sending a too large request"); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } break; case ec_TIMEOUT: if (session->kept_alive == 0) { session->return_code = 408; send_code(session); handle_timeout(session); } break; case ec_CLIENT_DISCONNECTED: if (session->kept_alive == 0) { log_system(session, "Silent client disconnected"); } break; case ec_SOCKET_READ_ERROR: if (errno != ECONNRESET) { log_system(session, "Error while reading request"); } break; case ec_SOCKET_WRITE_ERROR: log_request(session); break; case ec_FORCE_QUIT: log_system(session, "Client kicked"); break; case ec_SQL_INJECTION: if ((session->config->ban_on_sqli > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_sqli, session->config->kick_on_ban); hostname = (session->hostname != NULL) ? session->hostname : unknown_host; log_system(session, "Client banned because of SQL injection on %s", hostname); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } session->return_code = 441; send_code(session); log_request(session); break; case ec_XSS: session->return_code = 442; send_code(session); log_request(session); break; case ec_CSRF: session->return_code = 443; send_code(session); log_request(session); break; case ec_INVALID_URL: if ((session->config->ban_on_invalid_url > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_invalid_url, session->config->kick_on_ban); hostname = (session->hostname != NULL) ? session->hostname : unknown_host; log_system(session, "Client banned because of invalid URL on %s", hostname); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } send_code(session); break; default: if (session->data_sent == false) { session->return_code = 500; if (send_code(session) == -1) { session->keep_alive = false; } } } else switch (result) { case 200: break; case 201: case 204: case 304: case 412: if (session->data_sent == false) { session->return_code = result; if (send_header(session) == -1) { session->keep_alive = false; } else if (send_buffer(session, "Content-Length: 0\r\n\r\n", 21) == -1) { session->keep_alive = false; } } break; case 411: case 413: session->keep_alive = false; if (session->data_sent == false) { session->return_code = result; if (send_header(session) == -1) { session->keep_alive = false; } else if (send_buffer(session, "Content-Length: 0\r\n\r\n", 21) == -1) { session->keep_alive = false; } } break; case 400: log_garbage(session); if (session->data_sent == false) { session->return_code = 400; if (send_code(session) == -1) { session->keep_alive = false; } } if ((session->config->ban_on_garbage > 0) && (ip_allowed(&(session->ip_address), session->config->banlist_mask) != deny)) { ban_ip(&(session->ip_address), session->config->ban_on_garbage, session->config->kick_on_ban); log_system(session, "Client banned because of sending garbage"); #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_ban(session); } #endif } #ifdef ENABLE_MONITOR if (session->config->monitor_enabled) { monitor_count_bad_request(session); } #endif break; case 401: case 403: case 404: case 501: case 503: if (session->data_sent == false) { switch (handle_error(session, result)) { case -1: session->keep_alive = false; break; case 200: break; default: if (session->data_sent == false) { session->return_code = result; if (send_code(session) == -1) { session->keep_alive = false; } } } } break; case 500: session->keep_alive = false; default: if (session->data_sent == false) { session->return_code = result; send_code(session); } } if ((result > 0) && (result != 400)) { log_request(session); } else { session->keep_alive = false; } }
int use_toolkit(char *url, char *toolkit_id, t_toolkit_options *options) { t_url_toolkit *toolkit; t_toolkit_rule *rule; bool condition_met, url_replaced = false; int result, skip = 0; char *file, *qmark, *header; regmatch_t pmatch[REGEXEC_NMATCH]; struct stat fileinfo; t_http_header *headers; if (options == NULL) { return UT_ERROR; } options->new_url = NULL; if ((toolkit = select_toolkit(toolkit_id, options->url_toolkit)) == NULL) { return UT_ERROR; } rule = toolkit->toolkit_rule; while (rule != NULL) { condition_met = false; /* Skip lines */ if (skip > 0) { skip--; rule = rule->next; continue; } /* Condition */ switch (rule->condition) { case tc_none: /* None */ condition_met = true; break; case tc_match: /* Match */ if (regexec(&(rule->pattern), url, REGEXEC_NMATCH, pmatch, 0) == 0) { condition_met = true; } if (rule->neg_match) { condition_met = (condition_met == false); } break; case tc_header: /* Header */ if (rule->header == NULL) { headers = options->http_headers; while (headers != NULL) { if (regexec(&(rule->pattern), headers->data + headers->value_offset, REGEXEC_NMATCH, pmatch, 0) == 0) { condition_met = true; } if (rule->neg_match) { condition_met = (condition_met == false); } if (condition_met) { break; } headers = headers->next; } } else { if ((header = get_http_header(rule->header, options->http_headers)) == NULL) { break; } if (regexec(&(rule->pattern), header, REGEXEC_NMATCH, pmatch, 0) == 0) { condition_met = true; } if (rule->neg_match) { condition_met = (condition_met == false); } } break; case tc_method: /* Request method */ if (strcmp(options->method, rule->parameter) == 0) { condition_met = true; } if (rule->neg_match) { condition_met = (condition_met == false); } break; case tc_request_uri: /* Request URI */ if (valid_uri(url, false) == false) { break; } if ((file = make_path(options->website_root, url)) == NULL) { return UT_ERROR; } if ((qmark = strchr(file, '?')) != NULL) { *qmark = '\0'; } url_decode(file); if (stat(file, &fileinfo) != -1) { switch (rule->value) { case IU_EXISTS: if (S_ISDIR(fileinfo.st_mode) || S_ISREG(fileinfo.st_mode)) { condition_met = true; } break; case IU_ISFILE: if (S_ISREG(fileinfo.st_mode)) { condition_met = true; } break; case IU_ISDIR: if (S_ISDIR(fileinfo.st_mode)) { condition_met = true; } break; } } free(file); break; case tc_total_connections: /* Total connections reached? */ condition_met = options->total_connections >= rule->value; break; #ifdef ENABLE_TLS case tc_use_tls: /* Client connections uses TLS? */ condition_met = options->use_tls; break; #endif } /* Condition not met */ if (condition_met == false) { rule = rule->next; continue; } /* Operation */ switch (rule->operation) { case to_none: /* None */ break; case to_ban: /* Ban client */ options->ban = rule->value; break; case to_deny_access: /* Deny access */ return UT_DENY_ACCESS; case to_omit_request_log: /* Omit requeest log */ options->log_request = false; break; case to_expire: /* Send Expire HTTP header */ options->expire = rule->value; options->caco_private = rule->caco_private; break; case to_fastcgi: /* Use FastCGI server */ options->fastcgi_server = rule->parameter; break; case to_redirect: /* Redirect client */ if (rule->neg_match) { if ((options->new_url = strdup(rule->parameter)) == NULL) { return UT_ERROR; } } else if (do_rewrite(url, &(rule->pattern), pmatch, rule->parameter, &(options->new_url), rule->match_loop) == -1) { if (options->new_url != NULL) { free(options->new_url); options->new_url = NULL; } return UT_ERROR; } if (options->new_url != NULL) { if (url_replaced) { free(url); } return UT_REDIRECT; } else if (url_replaced) { options->new_url = url; } break; case to_rewrite: /* Rewrite */ if (rule->neg_match) { if ((options->new_url = strdup(rule->parameter)) == NULL) { return UT_ERROR; } } else if (do_rewrite(url, &(rule->pattern), pmatch, rule->parameter, &(options->new_url), rule->match_loop) == -1) { if (options->new_url != NULL) { free(options->new_url); options->new_url = NULL; } return UT_ERROR; } if (options->new_url != NULL) { if (url_replaced) { free(url); } url = options->new_url; url_replaced = true; } else if (url_replaced) { options->new_url = url; } break; case to_skip: /* Skip */ skip = rule->value; break; case to_sub: /* Subroutine */ if (++(options->sub_depth) > MAX_SUB_DEPTH) { return UT_ERROR; } if ((result = use_toolkit(url, rule->parameter, options)) == UT_ERROR) { if (options->new_url != NULL) { free(options->new_url); options->new_url = NULL; } return UT_ERROR; } options->sub_depth--; if (options->new_url != NULL) { if (url_replaced) { free(url); } url = options->new_url; url_replaced = true; } else if (url_replaced) { options->new_url = url; } if (result != UT_RETURN) { return result; } break; case to_use: /* Replace URL */ if (url_replaced) { free(url); } if ((options->new_url = strdup(rule->parameter)) == NULL) { return UT_ERROR; } break; } /* Flow */ switch (rule->flow) { case tf_continue: /* Continue */ break; case tf_exit: /* Exit */ return UT_EXIT; case tf_return: /* Return */ return UT_RETURN; } rule = rule->next; } return UT_RETURN; }