contrib/serf/ssltunnel.c

   1 /* Copyright 2011 Justin Erenkrantz and Greg Stein
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /*** Setup a SSL tunnel over a HTTP proxy, according to RFC 2817. ***/
  17
  18 #include <apr_pools.h>
  19 #include <apr_strings.h>
  20
  21 #include "serf.h"
  22 #include "serf_private.h"
  23
  24
  25 /* Structure passed around as baton for the CONNECT request and respone. */
  26 typedef struct {
  27     apr_pool_t *pool;
  28     const char *uri;
  29 } req_ctx_t;
  30
  31 /* forward declaration. */
  32 static apr_status_t setup_request(serf_request_t *request,
  33                                   void *setup_baton,
  34                                   serf_bucket_t **req_bkt,
  35                                   serf_response_acceptor_t *acceptor,
  36                                   void **acceptor_baton,
  37                                   serf_response_handler_t *handler,
  38                                   void **handler_baton,
  39                                   apr_pool_t *pool);
  40
  41 static serf_bucket_t* accept_response(serf_request_t *request,
  42                                       serf_bucket_t *stream,
  43                                       void *acceptor_baton,
  44                                       apr_pool_t *pool)
  45 {
  46     serf_bucket_t *c;
  47     serf_bucket_alloc_t *bkt_alloc;
  48 #if 0
  49     req_ctx_t *ctx = acceptor_baton;
  50 #endif
  51
  52     /* get the per-request bucket allocator */
  53     bkt_alloc = serf_request_get_alloc(request);
  54
  55     /* Create a barrier so the response doesn't eat us! */
  56     c = serf_bucket_barrier_create(stream, bkt_alloc);
  57
  58     return serf_bucket_response_create(c, bkt_alloc);
  59 }
  60
  61 /* If a 200 OK was received for the CONNECT request, consider the connection
  62    as ready for use. */
  63 static apr_status_t handle_response(serf_request_t *request,
  64                                     serf_bucket_t *response,
  65                                     void *handler_baton,
  66                                     apr_pool_t *pool)
  67 {
  68     apr_status_t status;
  69     serf_status_line sl;
  70     req_ctx_t *ctx = handler_baton;
  71
  72     if (! response) {
  73         serf_connection_request_create(request->conn,
  74                                        setup_request,
  75                                        ctx);
  76         return APR_SUCCESS;
  77     }
  78
  79     status = serf_bucket_response_status(response, &sl);
  80     if (SERF_BUCKET_READ_ERROR(status)) {
  81         return status;
  82     }
  83     if (!sl.version && (APR_STATUS_IS_EOF(status) ||
  84                       APR_STATUS_IS_EAGAIN(status)))
  85     {
  86         return status;
  87     }
  88
  89     status = serf_bucket_response_wait_for_headers(response);
  90     if (status && !APR_STATUS_IS_EOF(status)) {
  91         return status;
  92     }
  93
  94     /* RFC 2817:  Any successful (2xx) response to a CONNECT request indicates
  95        that the proxy has established a connection to the requested host and
  96        port, and has switched to tunneling the current connection to that server
  97        connection.
  98     */
  99     if (sl.code >= 200 && sl.code < 300) {
 100         request->conn->state = SERF_CONN_CONNECTED;
 101
 102         /* Body is supposed to be empty. */
 103         apr_pool_destroy(ctx->pool);
 104         serf_bucket_destroy(request->conn->ssltunnel_ostream);
 105         request->conn->stream = NULL;
 106         ctx = NULL;
 107
 108         serf__log(CONN_VERBOSE, __FILE__,
 109                   "successfully set up ssl tunnel on connection 0x%x\n",
 110                   request->conn);
 111
 112         return APR_EOF;
 113     }
 114
 115     /* Authentication failure and 2xx Ok are handled at this point,
 116        the rest are errors. */
 117     return SERF_ERROR_SSLTUNNEL_SETUP_FAILED;
 118 }
 119
 120 /* Prepare the CONNECT request. */
 121 static apr_status_t setup_request(serf_request_t *request,
 122                                   void *setup_baton,
 123                                   serf_bucket_t **req_bkt,
 124                                   serf_response_acceptor_t *acceptor,
 125                                   void **acceptor_baton,
 126                                   serf_response_handler_t *handler,
 127                                   void **handler_baton,
 128                                   apr_pool_t *pool)
 129 {
 130     req_ctx_t *ctx = setup_baton;
 131
 132     *req_bkt =
 133         serf_request_bucket_request_create(request,
 134                                            "CONNECT", ctx->uri,
 135                                            NULL,
 136                                            serf_request_get_alloc(request));
 137     *acceptor = accept_response;
 138     *acceptor_baton = ctx;
 139     *handler = handle_response;
 140     *handler_baton = ctx;
 141
 142     return APR_SUCCESS;
 143 }
 144
 145 static apr_status_t detect_eof(void *baton, serf_bucket_t *aggregate_bucket)
 146 {
 147     serf_connection_t *conn = baton;
 148     conn->hit_eof = 1;
 149     return APR_EAGAIN;
 150 }
 151
 152 /* SSL tunnel is needed, push a CONNECT request on the connection. */
 153 apr_status_t serf__ssltunnel_connect(serf_connection_t *conn)
 154 {
 155     req_ctx_t *ctx;
 156     apr_pool_t *ssltunnel_pool;
 157
 158     apr_pool_create(&ssltunnel_pool, conn->pool);
 159
 160     ctx = apr_palloc(ssltunnel_pool, sizeof(*ctx));
 161     ctx->pool = ssltunnel_pool;
 162     ctx->uri = apr_psprintf(ctx->pool, "%s:%d", conn->host_info.hostname,
 163                             conn->host_info.port);
 164
 165     conn->ssltunnel_ostream = serf__bucket_stream_create(conn->allocator,
 166                                                          detect_eof,
 167                                                          conn);
 168
 169     serf__ssltunnel_request_create(conn,
 170                                    setup_request,
 171                                    ctx);
 172
 173     conn->state = SERF_CONN_SETUP_SSLTUNNEL;
 174     serf__log(CONN_VERBOSE, __FILE__,
 175               "setting up ssl tunnel on connection 0x%x\n", conn);
 176
 177     return APR_SUCCESS;
 178 }