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/***************************************************************************
* Copyright (c) 2009-2010 Open Information Security Foundation
* Copyright (c) 2010-2013 Qualys, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the Qualys, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***************************************************************************/
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "htp.h"
#include "htp_transaction.h"
module AP_MODULE_DECLARE_DATA libhtp_module;
// XXX Handle all allocation failures
static int convert_method_number(int method_number) {
// We can cheat here because LibHTP reuses Apache's
// method identifiers. But we really shouldn't.
if ((method_number >= 0)&&(method_number <= 26)) {
return method_number;
}
// TODO Decouple this functions from Apache's internals.
return HTP_M_UNKNOWN;
}
static int convert_protocol_number(int protocol_number) {
// In Apache, 1.1 is stored as 1001. In LibHTP,
// the same protocol number is stored as 101.
return (protocol_number / 1000) * 100 + (protocol_number % 1000);
}
static apr_status_t transaction_cleanup(htp_tx_t *tx) {
htp_tx_destroy(tx);
return APR_SUCCESS;
}
static int libhtp_post_read_request(request_rec *r) {
htp_connp_t *connp = ap_get_module_config(r->connection->conn_config, &libhtp_module);
if (connp == NULL) return DECLINED;
// Create a new LibHTP transaction
htp_tx_t *tx = htp_connp_tx_create(connp);
if (tx == NULL) return DECLINED;
// Request begins
htp_tx_state_request_start(tx);
// Populate request line
htp_tx_req_set_method_c(tx, r->method, HTP_ALLOC_REUSE);
htp_tx_req_set_method_number(tx, convert_method_number(r->method_number));
htp_tx_req_set_uri_c(tx, r->uri, HTP_ALLOC_REUSE);
htp_tx_req_set_query_string_c(tx, r->args, HTP_ALLOC_REUSE);
htp_tx_req_set_protocol_c(tx, r->protocol, HTP_ALLOC_REUSE);
htp_tx_req_set_protocol_number(tx, convert_protocol_number(r->proto_num));
htp_tx_req_set_protocol_0_9(tx, r->assbackwards);
// Request line available
htp_tx_state_request_line(tx);
// Populate request headers
size_t i;
const apr_array_header_t *arr = apr_table_elts(r->headers_in);
const apr_table_entry_t *te = (apr_table_entry_t *) arr->elts;
for (i = 0; i < arr->nelts; i++) {
htp_tx_req_set_header_c(tx, te[i].key, te[i].val, HTP_ALLOC_REUSE);
}
// Request headers available
htp_tx_state_request_headers(tx);
// Attach LibHTP's transaction to Apache's request
ap_set_module_config(r->request_config, &libhtp_module, tx);
apr_pool_cleanup_register(r->pool, (void *)tx,
(apr_status_t (*)(void *))transaction_cleanup, apr_pool_cleanup_null);
return DECLINED;
}
static apr_status_t connection_cleanup(htp_connp_t *connp) {
htp_config_destroy(connp->cfg);
htp_connp_destroy(connp);
return APR_SUCCESS;
}
static int libhtp_pre_connection(conn_rec *c, void *csd) {
// Configuration; normally you'd read the configuration from
// a file, or some other type of storage, but, because this is
// just an example, we have it hard-coded.
htp_cfg_t *cfg = htp_config_create();
if (cfg == NULL) return OK;
htp_config_set_server_personality(cfg, HTP_SERVER_APACHE_2_2);
htp_config_register_urlencoded_parser(cfg);
htp_config_register_multipart_parser(cfg);
// Connection parser
htp_connp_t *connp = htp_connp_create(cfg);
if (connp == NULL) {
htp_config_destroy(cfg);
free(connp);
return OK;
}
// Open connection
htp_connp_open(connp, c->remote_ip, /* XXX remote port */ 0, c->local_ip, /* XXX local port */0, NULL);
ap_set_module_config(c->conn_config, &libhtp_module, connp);
apr_pool_cleanup_register(c->pool, (void *)connp,
(apr_status_t (*)(void *))connection_cleanup, apr_pool_cleanup_null);
return OK;
}
static void libhtp_register_hooks(apr_pool_t *p) {
ap_hook_pre_connection(libhtp_pre_connection, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_post_read_request(libhtp_post_read_request, NULL, NULL, APR_HOOK_MIDDLE);
}
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA libhtp_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
NULL, /* table of config file commands */
libhtp_register_hooks /* register hooks */
};
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