/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* CONNECT method for Apache proxy */ #define CORE_PRIVATE #include "mod_proxy.h" #include "apr_poll.h" module AP_MODULE_DECLARE_DATA proxy_connect_module; /* * This handles Netscape CONNECT method secure proxy requests. * A connection is opened to the specified host and data is * passed through between the WWW site and the browser. * * This code is based on the INTERNET-DRAFT document * "Tunneling SSL Through a WWW Proxy" currently at * http://www.mcom.com/newsref/std/tunneling_ssl.html. * * If proxyhost and proxyport are set, we send a CONNECT to * the specified proxy.. * * FIXME: this doesn't log the number of bytes sent, but * that may be okay, since the data is supposed to * be transparent. In fact, this doesn't log at all * yet. 8^) * FIXME: doesn't check any headers initally sent from the * client. * FIXME: should allow authentication, but hopefully the * generic proxy authentication is good enough. * FIXME: no check for r->assbackwards, whatever that is. */ static int allowed_port(proxy_server_conf *conf, int port) { int i; int *list = (int *) conf->allowed_connect_ports->elts; for(i = 0; i < conf->allowed_connect_ports->nelts; i++) { if(port == list[i]) return 1; } return 0; } /* canonicalise CONNECT URLs. */ static int proxy_connect_canon(request_rec *r, char *url) { if (r->method_number != M_CONNECT) { return DECLINED; } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: canonicalising URL %s", url); return OK; } /* CONNECT handler */ static int proxy_connect_handler(request_rec *r, proxy_worker *worker, proxy_server_conf *conf, char *url, const char *proxyname, apr_port_t proxyport) { apr_pool_t *p = r->pool; apr_socket_t *sock; apr_status_t err, rv; apr_size_t i, o, nbytes; char buffer[HUGE_STRING_LEN]; apr_socket_t *client_socket = ap_get_module_config(r->connection->conn_config, &core_module); int failed; apr_pollset_t *pollset; apr_pollfd_t pollfd; const apr_pollfd_t *signalled; apr_int32_t pollcnt, pi; apr_int16_t pollevent; apr_sockaddr_t *uri_addr, *connect_addr; apr_uri_t uri; const char *connectname; int connectport = 0; /* is this for us? */ if (r->method_number != M_CONNECT) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: declining URL %s", url); return DECLINED; } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: serving URL %s", url); /* * Step One: Determine Who To Connect To * * Break up the URL to determine the host to connect to */ /* we break the URL into host, port, uri */ if (APR_SUCCESS != apr_uri_parse_hostinfo(p, url, &uri)) { return ap_proxyerror(r, HTTP_BAD_REQUEST, apr_pstrcat(p, "URI cannot be parsed: ", url, NULL)); } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: connecting %s to %s:%d", url, uri.hostname, uri.port); /* do a DNS lookup for the destination host */ err = apr_sockaddr_info_get(&uri_addr, uri.hostname, APR_UNSPEC, uri.port, 0, p); if (APR_SUCCESS != err) { return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p, "DNS lookup failure for: ", uri.hostname, NULL)); } /* are we connecting directly, or via a proxy? */ if (proxyname) { connectname = proxyname; connectport = proxyport; err = apr_sockaddr_info_get(&connect_addr, proxyname, APR_UNSPEC, proxyport, 0, p); } else { connectname = uri.hostname; connectport = uri.port; connect_addr = uri_addr; } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: connecting to remote proxy %s on port %d", connectname, connectport); /* check if ProxyBlock directive on this host */ if (OK != ap_proxy_checkproxyblock(r, conf, uri_addr)) { return ap_proxyerror(r, HTTP_FORBIDDEN, "Connect to remote machine blocked"); } /* Check if it is an allowed port */ if (conf->allowed_connect_ports->nelts == 0) { /* Default setting if not overridden by AllowCONNECT */ switch (uri.port) { case APR_URI_HTTPS_DEFAULT_PORT: case APR_URI_SNEWS_DEFAULT_PORT: break; default: /* XXX can we call ap_proxyerror() here to get a nice log message? */ return HTTP_FORBIDDEN; } } else if(!allowed_port(conf, uri.port)) { /* XXX can we call ap_proxyerror() here to get a nice log message? */ return HTTP_FORBIDDEN; } /* * Step Two: Make the Connection * * We have determined who to connect to. Now make the connection. */ /* get all the possible IP addresses for the destname and loop through them * until we get a successful connection */ if (APR_SUCCESS != err) { return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p, "DNS lookup failure for: ", connectname, NULL)); } /* * At this point we have a list of one or more IP addresses of * the machine to connect to. If configured, reorder this * list so that the "best candidate" is first try. "best * candidate" could mean the least loaded server, the fastest * responding server, whatever. * * For now we do nothing, ie we get DNS round robin. * XXX FIXME */ failed = ap_proxy_connect_to_backend(&sock, "CONNECT", connect_addr, connectname, conf, r->server, r->pool); /* handle a permanent error from the above loop */ if (failed) { if (proxyname) { return DECLINED; } else { return HTTP_BAD_GATEWAY; } } /* * Step Three: Send the Request * * Send the HTTP/1.1 CONNECT request to the remote server */ /* we are acting as a tunnel - the output filter stack should * be completely empty, because when we are done here we are done completely. * We add the NULL filter to the stack to do this... */ r->output_filters = NULL; r->connection->output_filters = NULL; /* If we are connecting through a remote proxy, we need to pass * the CONNECT request on to it. */ if (proxyport) { /* FIXME: Error checking ignored. */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: sending the CONNECT request to the remote proxy"); nbytes = apr_snprintf(buffer, sizeof(buffer), "CONNECT %s HTTP/1.0" CRLF, r->uri); apr_socket_send(sock, buffer, &nbytes); nbytes = apr_snprintf(buffer, sizeof(buffer), "Proxy-agent: %s" CRLF CRLF, ap_get_server_banner()); apr_socket_send(sock, buffer, &nbytes); } else { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: Returning 200 OK Status"); nbytes = apr_snprintf(buffer, sizeof(buffer), "HTTP/1.0 200 Connection Established" CRLF); ap_xlate_proto_to_ascii(buffer, nbytes); apr_socket_send(client_socket, buffer, &nbytes); nbytes = apr_snprintf(buffer, sizeof(buffer), "Proxy-agent: %s" CRLF CRLF, ap_get_server_banner()); ap_xlate_proto_to_ascii(buffer, nbytes); apr_socket_send(client_socket, buffer, &nbytes); #if 0 /* This is safer code, but it doesn't work yet. I'm leaving it * here so that I can fix it later. */ r->status = HTTP_OK; r->header_only = 1; apr_table_set(r->headers_out, "Proxy-agent: %s", ap_get_server_banner()); ap_rflush(r); #endif } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: setting up poll()"); /* * Step Four: Handle Data Transfer * * Handle two way transfer of data over the socket (this is a tunnel). */ /* r->sent_bodyct = 1;*/ if ((rv = apr_pollset_create(&pollset, 2, r->pool, 0)) != APR_SUCCESS) { apr_socket_close(sock); ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, "proxy: CONNECT: error apr_pollset_create()"); return HTTP_INTERNAL_SERVER_ERROR; } /* Add client side to the poll */ pollfd.p = r->pool; pollfd.desc_type = APR_POLL_SOCKET; pollfd.reqevents = APR_POLLIN; pollfd.desc.s = client_socket; pollfd.client_data = NULL; apr_pollset_add(pollset, &pollfd); /* Add the server side to the poll */ pollfd.desc.s = sock; apr_pollset_add(pollset, &pollfd); while (1) { /* Infinite loop until error (one side closes the connection) */ if ((rv = apr_pollset_poll(pollset, -1, &pollcnt, &signalled)) != APR_SUCCESS) { apr_socket_close(sock); ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, "proxy: CONNECT: error apr_poll()"); return HTTP_INTERNAL_SERVER_ERROR; } #ifdef DEBUGGING ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: woke from select(), i=%d", pollcnt); #endif for (pi = 0; pi < pollcnt; pi++) { const apr_pollfd_t *cur = &signalled[pi]; if (cur->desc.s == sock) { pollevent = cur->rtnevents; if (pollevent & APR_POLLIN) { #ifdef DEBUGGING ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: sock was set"); #endif nbytes = sizeof(buffer); rv = apr_socket_recv(sock, buffer, &nbytes); if (rv == APR_SUCCESS) { o = 0; i = nbytes; while(i > 0) { nbytes = i; /* This is just plain wrong. No module should ever write directly * to the client. For now, this works, but this is high on my list of * things to fix. The correct line is: * if ((nbytes = ap_rwrite(buffer + o, nbytes, r)) < 0) * rbb */ rv = apr_socket_send(client_socket, buffer + o, &nbytes); if (rv != APR_SUCCESS) break; o += nbytes; i -= nbytes; } } else break; } else if ((pollevent & APR_POLLERR) || (pollevent & APR_POLLHUP)) break; } else if (cur->desc.s == client_socket) { pollevent = cur->rtnevents; if (pollevent & APR_POLLIN) { #ifdef DEBUGGING ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: client was set"); #endif nbytes = sizeof(buffer); rv = apr_socket_recv(client_socket, buffer, &nbytes); if (rv == APR_SUCCESS) { o = 0; i = nbytes; #ifdef DEBUGGING ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: read %d from client", i); #endif while(i > 0) { nbytes = i; rv = apr_socket_send(sock, buffer + o, &nbytes); if (rv != APR_SUCCESS) break; o += nbytes; i -= nbytes; } } else break; } else if ((pollevent & APR_POLLERR) || (pollevent & APR_POLLHUP)) { rv = APR_EOF; break; } } else break; } if (rv != APR_SUCCESS) { break; } } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "proxy: CONNECT: finished with poll() - cleaning up"); /* * Step Five: Clean Up * * Close the socket and clean up */ apr_socket_close(sock); return OK; } static void ap_proxy_connect_register_hook(apr_pool_t *p) { proxy_hook_scheme_handler(proxy_connect_handler, NULL, NULL, APR_HOOK_MIDDLE); proxy_hook_canon_handler(proxy_connect_canon, NULL, NULL, APR_HOOK_MIDDLE); } module AP_MODULE_DECLARE_DATA proxy_connect_module = { STANDARD20_MODULE_STUFF, NULL, /* create per-directory config structure */ NULL, /* merge per-directory config structures */ NULL, /* create per-server config structure */ NULL, /* merge per-server config structures */ NULL, /* command apr_table_t */ ap_proxy_connect_register_hook /* register hooks */ };
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