Adding upstream version 2.4.38.upstream/2.4.38upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/modules/proxy/mod_proxy_connect.c b/modules/proxy/mod_proxy_connect.c
new file mode 100644
index 0000000..7be6a6a
--- /dev/null
+++ b/modules/proxy/mod_proxy_connect.c
@@ -0,0 +1,486 @@
+/* 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 */
+
+#include "mod_proxy.h"
+#include "apr_poll.h"
+
+#define CONN_BLKSZ AP_IOBUFSIZE
+
+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.
+ */
+
+typedef struct {
+    apr_array_header_t *allowed_connect_ports;
+} connect_conf;
+
+typedef struct {
+    int first;
+    int last;
+} port_range;
+
+static void *create_config(apr_pool_t *p, server_rec *s)
+{
+    connect_conf *c = apr_pcalloc(p, sizeof(connect_conf));
+    c->allowed_connect_ports = apr_array_make(p, 10, sizeof(port_range));
+    return c;
+}
+
+static void *merge_config(apr_pool_t *p, void *basev, void *overridesv)
+{
+    connect_conf *c = apr_pcalloc(p, sizeof(connect_conf));
+    connect_conf *base = (connect_conf *) basev;
+    connect_conf *overrides = (connect_conf *) overridesv;
+
+    c->allowed_connect_ports = apr_array_append(p,
+                                                base->allowed_connect_ports,
+                                                overrides->allowed_connect_ports);
+
+    return c;
+}
+
+
+/*
+ * Set the ports CONNECT can use
+ */
+static const char *
+    set_allowed_ports(cmd_parms *parms, void *dummy, const char *arg)
+{
+    server_rec *s = parms->server;
+    int first, last;
+    connect_conf *conf =
+        ap_get_module_config(s->module_config, &proxy_connect_module);
+    port_range *New;
+    char *endptr;
+    const char *p = arg;
+
+    if (!apr_isdigit(arg[0]))
+        return "AllowCONNECT: port numbers must be numeric";
+
+    first = strtol(p, &endptr, 10);
+    if (*endptr == '-') {
+        p = endptr + 1;
+        last = strtol(p, &endptr, 10);
+    }
+    else {
+        last = first;
+    }
+
+    if (endptr == p || *endptr != '\0')  {
+        return apr_psprintf(parms->temp_pool,
+                            "Cannot parse '%s' as port number", p);
+    }
+
+    New = apr_array_push(conf->allowed_connect_ports);
+    New->first = first;
+    New->last  = last;
+    return NULL;
+}
+
+
+static int allowed_port(connect_conf *conf, int port)
+{
+    int i;
+    port_range *list = (port_range *) conf->allowed_connect_ports->elts;
+
+    if (apr_is_empty_array(conf->allowed_connect_ports)) {
+        return port == APR_URI_HTTPS_DEFAULT_PORT
+               || port == APR_URI_SNEWS_DEFAULT_PORT;
+    }
+
+    for (i = 0; i < conf->allowed_connect_ports->nelts; i++) {
+        if (port >= list[i].first && port <= list[i].last)
+            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_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "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)
+{
+    connect_conf *c_conf =
+        ap_get_module_config(r->server->module_config, &proxy_connect_module);
+
+    apr_pool_t *p = r->pool;
+    apr_socket_t *sock;
+    conn_rec *c = r->connection;
+    conn_rec *backconn;
+    int done = 0;
+
+    apr_bucket_brigade *bb_front;
+    apr_bucket_brigade *bb_back;
+    apr_status_t rv;
+    apr_size_t nbytes;
+    char buffer[HUGE_STRING_LEN];
+    apr_socket_t *client_socket = ap_get_conn_socket(c);
+    int failed, rc;
+    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 *nexthop;
+
+    apr_uri_t uri;
+    const char *connectname;
+    apr_port_t connectport = 0;
+
+    /* is this for us? */
+    if (r->method_number != M_CONNECT) {
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "declining URL %s", url);
+        return DECLINED;
+    }
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "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_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01019)
+                  "connecting %s to %s:%d", url, uri.hostname, uri.port);
+
+    /* Determine host/port of next hop; from request URI or of a proxy. */
+    connectname = proxyname ? proxyname : uri.hostname;
+    connectport = proxyname ? proxyport : uri.port;
+
+    /* Do a DNS lookup for the next hop */
+    rv = apr_sockaddr_info_get(&nexthop, connectname, APR_UNSPEC, 
+                               connectport, 0, p);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02327)
+                      "failed to resolve hostname '%s'", connectname);
+        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
+                             apr_pstrcat(p, "DNS lookup failure for: ",
+                                         connectname, NULL));
+    }
+
+    /* Check ProxyBlock directive on the hostname/address.  */
+    if (ap_proxy_checkproxyblock2(r, conf, uri.hostname, 
+                                 proxyname ? NULL : nexthop) != OK) {
+        return ap_proxyerror(r, HTTP_FORBIDDEN,
+                             "Connect to remote machine blocked");
+    }
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+                  "connecting to remote proxy %s on port %d",
+                  connectname, connectport);
+
+    /* Check if it is an allowed port */
+    if (!allowed_port(c_conf, uri.port)) {
+        return ap_proxyerror(r, HTTP_FORBIDDEN,
+                             "Connect to remote machine blocked");
+    }
+
+    /*
+     * Step Two: Make the Connection
+     *
+     * We have determined who to connect to. Now make the connection.
+     */
+
+    /*
+     * 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", nexthop,
+                                         connectname, conf, r);
+
+    /* handle a permanent error from the above loop */
+    if (failed) {
+        if (proxyname) {
+            return DECLINED;
+        }
+        else {
+            return HTTP_SERVICE_UNAVAILABLE;
+        }
+    }
+
+    /* setup polling for connection */
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "setting up poll()");
+
+    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, APLOGNO(01020)
+                      "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 | APR_POLLHUP;
+    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);
+
+    /*
+     * Step Three: Send the Request
+     *
+     * Send the HTTP/1.1 CONNECT request to the remote server
+     */
+
+    backconn = ap_run_create_connection(c->pool, r->server, sock,
+                                        c->id, c->sbh, c->bucket_alloc);
+    if (!backconn) {
+        /* peer reset */
+        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01021)
+                      "an error occurred creating a new connection "
+                      "to %pI (%s)", nexthop, connectname);
+        apr_socket_close(sock);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+    ap_proxy_ssl_engine(backconn, r->per_dir_config, 0);
+    rc = ap_run_pre_connection(backconn, sock);
+    if (rc != OK && rc != DONE) {
+        backconn->aborted = 1;
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01022)
+                      "pre_connection setup failed (%d)", rc);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r,
+                  "connection complete to %pI (%s)",
+                  nexthop, connectname);
+    apr_table_setn(r->notes, "proxy-source-port", apr_psprintf(r->pool, "%hu",
+                   backconn->local_addr->port));
+
+
+    bb_front = apr_brigade_create(p, c->bucket_alloc);
+    bb_back = apr_brigade_create(p, backconn->bucket_alloc);
+
+    /* 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_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                      "sending the CONNECT request to the remote proxy");
+        ap_fprintf(backconn->output_filters, bb_back,
+                   "CONNECT %s HTTP/1.0" CRLF, r->uri);
+        ap_fprintf(backconn->output_filters, bb_back,
+                   "Proxy-agent: %s" CRLF CRLF, ap_get_server_banner());
+        ap_fflush(backconn->output_filters, bb_back);
+    }
+    else {
+        ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "Returning 200 OK");
+        nbytes = apr_snprintf(buffer, sizeof(buffer),
+                              "HTTP/1.0 200 Connection Established" CRLF);
+        ap_xlate_proto_to_ascii(buffer, nbytes);
+        ap_fwrite(c->output_filters, bb_front, buffer, nbytes);
+        nbytes = apr_snprintf(buffer, sizeof(buffer),
+                              "Proxy-agent: %s" CRLF CRLF,
+                              ap_get_server_banner());
+        ap_xlate_proto_to_ascii(buffer, nbytes);
+        ap_fwrite(c->output_filters, bb_front, buffer, nbytes);
+        ap_fflush(c->output_filters, bb_front);
+#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_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "setting up poll()");
+
+    /*
+     * Step Four: Handle Data Transfer
+     *
+     * Handle two way transfer of data over the socket (this is a tunnel).
+     */
+
+    /* we are now acting as a tunnel - the input/output filter stacks should
+     * not contain any non-connection filters.
+     */
+    r->output_filters = c->output_filters;
+    r->proto_output_filters = c->output_filters;
+    r->input_filters = c->input_filters;
+    r->proto_input_filters = c->input_filters;
+/*    r->sent_bodyct = 1;*/
+
+    do { /* Loop until done (one side closes the connection, or an error) */
+        rv = apr_pollset_poll(pollset, -1, &pollcnt, &signalled);
+        if (rv != APR_SUCCESS) {
+            if (APR_STATUS_IS_EINTR(rv)) {
+                continue;
+            }
+            apr_socket_close(sock);
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01023) "error apr_poll()");
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+#ifdef DEBUGGING
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01024)
+                      "woke from poll(), 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 | APR_POLLHUP)) {
+#ifdef DEBUGGING
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01025)
+                                  "sock was readable");
+#endif
+                    done |= ap_proxy_transfer_between_connections(r, backconn,
+                                                                  c, bb_back,
+                                                                  bb_front,
+                                                                  "sock", NULL,
+                                                                  CONN_BLKSZ, 1)
+                                                                 != APR_SUCCESS;
+                }
+                else if (pollevent & APR_POLLERR) {
+                    ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r, APLOGNO(01026)
+                                  "err on backconn");
+                    backconn->aborted = 1;
+                    done = 1;
+                }
+            }
+            else if (cur->desc.s == client_socket) {
+                pollevent = cur->rtnevents;
+                if (pollevent & (APR_POLLIN | APR_POLLHUP)) {
+#ifdef DEBUGGING
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01027)
+                                  "client was readable");
+#endif
+                    done |= ap_proxy_transfer_between_connections(r, c,
+                                                                  backconn,
+                                                                  bb_front,
+                                                                  bb_back,
+                                                                  "client",
+                                                                  NULL,
+                                                                  CONN_BLKSZ, 1)
+                                                                 != APR_SUCCESS;
+                }
+                else if (pollevent & APR_POLLERR) {
+                    ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r, APLOGNO(02827)
+                                  "err on client");
+                    c->aborted = 1;
+                    done = 1;
+                }
+            }
+            else {
+                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01028)
+                              "unknown socket in pollset");
+                done = 1;
+            }
+
+        }
+    } while (!done);
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+                  "finished with poll() - cleaning up");
+
+    /*
+     * Step Five: Clean Up
+     *
+     * Close the socket and clean up
+     */
+
+    if (backconn->aborted)
+        apr_socket_close(sock);
+    else
+        ap_lingering_close(backconn);
+
+    c->keepalive = AP_CONN_CLOSE;
+
+    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);
+}
+
+static const command_rec cmds[] =
+{
+    AP_INIT_ITERATE("AllowCONNECT", set_allowed_ports, NULL, RSRC_CONF,
+     "A list of ports or port ranges which CONNECT may connect to"),
+    {NULL}
+};
+
+AP_DECLARE_MODULE(proxy_connect) = {
+    STANDARD20_MODULE_STUFF,
+    NULL,       /* create per-directory config structure */
+    NULL,       /* merge per-directory config structures */
+    create_config,       /* create per-server config structure */
+    merge_config,       /* merge per-server config structures */
+    cmds,       /* command apr_table_t */
+    ap_proxy_connect_register_hook  /* register hooks */
+};