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988dc93196
correct the overflow handling. (returning APR_ENOSPC was changing the behaviour). git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@561778 13f79535-47bb-0310-9956-ffa450edef68
1764 lines
67 KiB
C
1764 lines
67 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* HTTP routines for Apache proxy */
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#include "mod_proxy.h"
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module AP_MODULE_DECLARE_DATA proxy_http_module;
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static apr_status_t ap_proxy_http_cleanup(const char *scheme,
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request_rec *r,
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proxy_conn_rec *backend);
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/*
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* Canonicalise http-like URLs.
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* scheme is the scheme for the URL
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* url is the URL starting with the first '/'
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* def_port is the default port for this scheme.
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*/
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static int proxy_http_canon(request_rec *r, char *url)
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{
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char *host, *path, *search, sport[7];
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const char *err;
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const char *scheme;
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apr_port_t port, def_port;
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/* ap_port_of_scheme() */
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if (strncasecmp(url, "http:", 5) == 0) {
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url += 5;
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scheme = "http";
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}
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else if (strncasecmp(url, "https:", 6) == 0) {
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url += 6;
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scheme = "https";
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}
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else {
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return DECLINED;
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}
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def_port = apr_uri_port_of_scheme(scheme);
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: HTTP: canonicalising URL %s", url);
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/* do syntatic check.
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* We break the URL into host, port, path, search
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*/
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port = def_port;
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err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
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if (err) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
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"error parsing URL %s: %s",
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url, err);
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return HTTP_BAD_REQUEST;
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}
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/* now parse path/search args, according to rfc1738 */
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/* N.B. if this isn't a true proxy request, then the URL _path_
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* has already been decoded. True proxy requests have r->uri
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* == r->unparsed_uri, and no others have that property.
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*/
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if (r->uri == r->unparsed_uri) {
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search = strchr(url, '?');
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if (search != NULL)
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*(search++) = '\0';
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}
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else
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search = r->args;
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/* process path */
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path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0, r->proxyreq);
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if (path == NULL)
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return HTTP_BAD_REQUEST;
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if (port != def_port)
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apr_snprintf(sport, sizeof(sport), ":%d", port);
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else
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sport[0] = '\0';
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if (ap_strchr_c(host, ':')) { /* if literal IPv6 address */
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host = apr_pstrcat(r->pool, "[", host, "]", NULL);
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}
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r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport,
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"/", path, (search) ? "?" : "", (search) ? search : "", NULL);
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return OK;
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}
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/* Clear all connection-based headers from the incoming headers table */
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static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
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{
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const char *name;
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char *next = apr_pstrdup(p, apr_table_get(headers, "Connection"));
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apr_table_unset(headers, "Proxy-Connection");
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if (!next)
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return;
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while (*next) {
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name = next;
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while (*next && !apr_isspace(*next) && (*next != ',')) {
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++next;
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}
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while (*next && (apr_isspace(*next) || (*next == ','))) {
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*next = '\0';
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++next;
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}
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apr_table_unset(headers, name);
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}
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apr_table_unset(headers, "Connection");
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}
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static void add_te_chunked(apr_pool_t *p,
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apr_bucket_alloc_t *bucket_alloc,
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apr_bucket_brigade *header_brigade)
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{
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apr_bucket *e;
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char *buf;
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const char te_hdr[] = "Transfer-Encoding: chunked" CRLF;
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buf = apr_pmemdup(p, te_hdr, sizeof(te_hdr)-1);
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ap_xlate_proto_to_ascii(buf, sizeof(te_hdr)-1);
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e = apr_bucket_pool_create(buf, sizeof(te_hdr)-1, p, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(header_brigade, e);
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}
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static void add_cl(apr_pool_t *p,
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apr_bucket_alloc_t *bucket_alloc,
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apr_bucket_brigade *header_brigade,
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const char *cl_val)
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{
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apr_bucket *e;
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char *buf;
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buf = apr_pstrcat(p, "Content-Length: ",
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cl_val,
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CRLF,
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NULL);
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ap_xlate_proto_to_ascii(buf, strlen(buf));
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e = apr_bucket_pool_create(buf, strlen(buf), p, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(header_brigade, e);
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}
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#define ASCII_CRLF "\015\012"
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#define ASCII_ZERO "\060"
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static void terminate_headers(apr_bucket_alloc_t *bucket_alloc,
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apr_bucket_brigade *header_brigade)
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{
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apr_bucket *e;
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/* add empty line at the end of the headers */
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e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(header_brigade, e);
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}
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static apr_status_t pass_brigade(apr_bucket_alloc_t *bucket_alloc,
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request_rec *r, proxy_conn_rec *conn,
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conn_rec *origin, apr_bucket_brigade *bb,
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int flush)
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{
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apr_status_t status;
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apr_off_t transferred;
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if (flush) {
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apr_bucket *e = apr_bucket_flush_create(bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, e);
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}
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apr_brigade_length(bb, 0, &transferred);
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if (transferred != -1)
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conn->worker->s->transferred += transferred;
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status = ap_pass_brigade(origin->output_filters, bb);
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if (status != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: pass request body failed to %pI (%s)",
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conn->addr, conn->hostname);
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return status;
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}
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apr_brigade_cleanup(bb);
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return APR_SUCCESS;
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}
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#define MAX_MEM_SPOOL 16384
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static apr_status_t stream_reqbody_chunked(apr_pool_t *p,
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request_rec *r,
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proxy_conn_rec *p_conn,
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conn_rec *origin,
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apr_bucket_brigade *header_brigade,
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apr_bucket_brigade *input_brigade)
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{
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int seen_eos = 0;
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apr_size_t hdr_len;
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apr_off_t bytes;
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apr_status_t status;
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apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
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apr_bucket_brigade *bb;
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apr_bucket *e;
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add_te_chunked(p, bucket_alloc, header_brigade);
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terminate_headers(bucket_alloc, header_brigade);
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while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
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{
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char chunk_hdr[20]; /* must be here due to transient bucket. */
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/* If this brigade contains EOS, either stop or remove it. */
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if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
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seen_eos = 1;
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/* We can't pass this EOS to the output_filters. */
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e = APR_BRIGADE_LAST(input_brigade);
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apr_bucket_delete(e);
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}
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apr_brigade_length(input_brigade, 1, &bytes);
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hdr_len = apr_snprintf(chunk_hdr, sizeof(chunk_hdr),
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"%" APR_UINT64_T_HEX_FMT CRLF,
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(apr_uint64_t)bytes);
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ap_xlate_proto_to_ascii(chunk_hdr, hdr_len);
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e = apr_bucket_transient_create(chunk_hdr, hdr_len,
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bucket_alloc);
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APR_BRIGADE_INSERT_HEAD(input_brigade, e);
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/*
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* Append the end-of-chunk CRLF
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*/
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e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(input_brigade, e);
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if (header_brigade) {
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/* we never sent the header brigade, so go ahead and
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* take care of that now
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*/
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bb = header_brigade;
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/*
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* Save input_brigade in bb brigade. (At least) in the SSL case
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* input_brigade contains transient buckets whose data would get
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* overwritten during the next call of ap_get_brigade in the loop.
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* ap_save_brigade ensures these buckets to be set aside.
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* Calling ap_save_brigade with NULL as filter is OK, because
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* bb brigade already has been created and does not need to get
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* created by ap_save_brigade.
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*/
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status = ap_save_brigade(NULL, &bb, &input_brigade, p);
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if (status != APR_SUCCESS) {
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return status;
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}
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header_brigade = NULL;
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}
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else {
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bb = input_brigade;
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}
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/* The request is flushed below this loop with chunk EOS header */
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status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 0);
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if (status != APR_SUCCESS) {
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return status;
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}
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if (seen_eos) {
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break;
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}
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status = ap_get_brigade(r->input_filters, input_brigade,
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AP_MODE_READBYTES, APR_BLOCK_READ,
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HUGE_STRING_LEN);
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if (status != APR_SUCCESS) {
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return status;
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}
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}
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if (header_brigade) {
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/* we never sent the header brigade because there was no request body;
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* send it now
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*/
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bb = header_brigade;
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}
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else {
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if (!APR_BRIGADE_EMPTY(input_brigade)) {
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/* input brigade still has an EOS which we can't pass to the output_filters. */
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e = APR_BRIGADE_LAST(input_brigade);
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AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(e));
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apr_bucket_delete(e);
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}
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bb = input_brigade;
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}
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e = apr_bucket_immortal_create(ASCII_ZERO ASCII_CRLF
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/* <trailers> */
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ASCII_CRLF,
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5, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, e);
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if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
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e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bb, e);
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}
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/* Now we have headers-only, or the chunk EOS mark; flush it */
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status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
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return status;
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}
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static apr_status_t stream_reqbody_cl(apr_pool_t *p,
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request_rec *r,
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proxy_conn_rec *p_conn,
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conn_rec *origin,
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apr_bucket_brigade *header_brigade,
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apr_bucket_brigade *input_brigade,
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const char *old_cl_val)
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{
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int seen_eos = 0;
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apr_status_t status = APR_SUCCESS;
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apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
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apr_bucket_brigade *bb;
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apr_bucket *e;
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apr_off_t cl_val = 0;
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apr_off_t bytes;
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apr_off_t bytes_streamed = 0;
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if (old_cl_val) {
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add_cl(p, bucket_alloc, header_brigade, old_cl_val);
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if (APR_SUCCESS != (status = apr_strtoff(&cl_val, old_cl_val, NULL,
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0))) {
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return status;
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}
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}
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terminate_headers(bucket_alloc, header_brigade);
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while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
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{
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apr_brigade_length(input_brigade, 1, &bytes);
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bytes_streamed += bytes;
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/* If this brigade contains EOS, either stop or remove it. */
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if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
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seen_eos = 1;
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/* We can't pass this EOS to the output_filters. */
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e = APR_BRIGADE_LAST(input_brigade);
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apr_bucket_delete(e);
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if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
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e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(input_brigade, e);
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}
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}
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/* C-L < bytes streamed?!?
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* We will error out after the body is completely
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* consumed, but we can't stream more bytes at the
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* back end since they would in part be interpreted
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* as another request! If nothing is sent, then
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* just send nothing.
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*
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* Prevents HTTP Response Splitting.
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*/
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if (bytes_streamed > cl_val)
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continue;
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if (header_brigade) {
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/* we never sent the header brigade, so go ahead and
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* take care of that now
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*/
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bb = header_brigade;
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|
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/*
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* Save input_brigade in bb brigade. (At least) in the SSL case
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* input_brigade contains transient buckets whose data would get
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* overwritten during the next call of ap_get_brigade in the loop.
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* ap_save_brigade ensures these buckets to be set aside.
|
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* Calling ap_save_brigade with NULL as filter is OK, because
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* bb brigade already has been created and does not need to get
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* created by ap_save_brigade.
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*/
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status = ap_save_brigade(NULL, &bb, &input_brigade, p);
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if (status != APR_SUCCESS) {
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return status;
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}
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header_brigade = NULL;
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}
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else {
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bb = input_brigade;
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}
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/* Once we hit EOS, we are ready to flush. */
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status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, seen_eos);
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if (status != APR_SUCCESS) {
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return status;
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}
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if (seen_eos) {
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break;
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}
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status = ap_get_brigade(r->input_filters, input_brigade,
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AP_MODE_READBYTES, APR_BLOCK_READ,
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HUGE_STRING_LEN);
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if (status != APR_SUCCESS) {
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return status;
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}
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}
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if (bytes_streamed != cl_val) {
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ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
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"proxy: client %s given Content-Length did not match"
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" number of body bytes read", r->connection->remote_ip);
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return APR_EOF;
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}
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if (header_brigade) {
|
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/* we never sent the header brigade since there was no request
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* body; send it now with the flush flag
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*/
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bb = header_brigade;
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status = pass_brigade(bucket_alloc, r, p_conn, origin, bb, 1);
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}
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return status;
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}
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static apr_status_t spool_reqbody_cl(apr_pool_t *p,
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request_rec *r,
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proxy_conn_rec *p_conn,
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conn_rec *origin,
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apr_bucket_brigade *header_brigade,
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apr_bucket_brigade *input_brigade,
|
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int force_cl)
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|
{
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int seen_eos = 0;
|
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apr_status_t status;
|
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apr_bucket_alloc_t *bucket_alloc = r->connection->bucket_alloc;
|
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apr_bucket_brigade *body_brigade;
|
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apr_bucket *e;
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apr_off_t bytes, bytes_spooled = 0, fsize = 0;
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apr_file_t *tmpfile = NULL;
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body_brigade = apr_brigade_create(p, bucket_alloc);
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while (!APR_BUCKET_IS_EOS(APR_BRIGADE_FIRST(input_brigade)))
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{
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/* If this brigade contains EOS, either stop or remove it. */
|
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if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
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seen_eos = 1;
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|
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/* We can't pass this EOS to the output_filters. */
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e = APR_BRIGADE_LAST(input_brigade);
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apr_bucket_delete(e);
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}
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apr_brigade_length(input_brigade, 1, &bytes);
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|
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if (bytes_spooled + bytes > MAX_MEM_SPOOL) {
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/* can't spool any more in memory; write latest brigade to disk */
|
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if (tmpfile == NULL) {
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const char *temp_dir;
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char *template;
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status = apr_temp_dir_get(&temp_dir, p);
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if (status != APR_SUCCESS) {
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ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
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"proxy: search for temporary directory failed");
|
|
return status;
|
|
}
|
|
apr_filepath_merge(&template, temp_dir,
|
|
"modproxy.tmp.XXXXXX",
|
|
APR_FILEPATH_NATIVE, p);
|
|
status = apr_file_mktemp(&tmpfile, template, 0, p);
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: creation of temporary file in directory %s failed",
|
|
temp_dir);
|
|
return status;
|
|
}
|
|
}
|
|
for (e = APR_BRIGADE_FIRST(input_brigade);
|
|
e != APR_BRIGADE_SENTINEL(input_brigade);
|
|
e = APR_BUCKET_NEXT(e)) {
|
|
const char *data;
|
|
apr_size_t bytes_read, bytes_written;
|
|
|
|
apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ);
|
|
status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written);
|
|
if (status != APR_SUCCESS) {
|
|
const char *tmpfile_name;
|
|
|
|
if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) {
|
|
tmpfile_name = "(unknown)";
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: write to temporary file %s failed",
|
|
tmpfile_name);
|
|
return status;
|
|
}
|
|
AP_DEBUG_ASSERT(bytes_read == bytes_written);
|
|
fsize += bytes_written;
|
|
}
|
|
apr_brigade_cleanup(input_brigade);
|
|
}
|
|
else {
|
|
|
|
/*
|
|
* Save input_brigade in body_brigade. (At least) in the SSL case
|
|
* input_brigade contains transient buckets whose data would get
|
|
* overwritten during the next call of ap_get_brigade in the loop.
|
|
* ap_save_brigade ensures these buckets to be set aside.
|
|
* Calling ap_save_brigade with NULL as filter is OK, because
|
|
* body_brigade already has been created and does not need to get
|
|
* created by ap_save_brigade.
|
|
*/
|
|
status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p);
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
}
|
|
|
|
bytes_spooled += bytes;
|
|
|
|
if (seen_eos) {
|
|
break;
|
|
}
|
|
|
|
status = ap_get_brigade(r->input_filters, input_brigade,
|
|
AP_MODE_READBYTES, APR_BLOCK_READ,
|
|
HUGE_STRING_LEN);
|
|
|
|
if (status != APR_SUCCESS) {
|
|
return status;
|
|
}
|
|
}
|
|
|
|
if (bytes_spooled || force_cl) {
|
|
add_cl(p, bucket_alloc, header_brigade, apr_off_t_toa(p, bytes_spooled));
|
|
}
|
|
terminate_headers(bucket_alloc, header_brigade);
|
|
APR_BRIGADE_CONCAT(header_brigade, body_brigade);
|
|
if (tmpfile) {
|
|
apr_brigade_insert_file(header_brigade, tmpfile, 0, fsize, p);
|
|
}
|
|
if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) {
|
|
e = apr_bucket_immortal_create(ASCII_CRLF, 2, bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
|
|
}
|
|
/* This is all a single brigade, pass with flush flagged */
|
|
status = pass_brigade(bucket_alloc, r, p_conn, origin, header_brigade, 1);
|
|
return status;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxy_http_request(apr_pool_t *p, request_rec *r,
|
|
proxy_conn_rec *p_conn, conn_rec *origin,
|
|
proxy_server_conf *conf,
|
|
apr_uri_t *uri,
|
|
char *url, char *server_portstr)
|
|
{
|
|
conn_rec *c = r->connection;
|
|
apr_bucket_alloc_t *bucket_alloc = c->bucket_alloc;
|
|
apr_bucket_brigade *header_brigade;
|
|
apr_bucket_brigade *input_brigade;
|
|
apr_bucket_brigade *temp_brigade;
|
|
apr_bucket *e;
|
|
char *buf;
|
|
const apr_array_header_t *headers_in_array;
|
|
const apr_table_entry_t *headers_in;
|
|
int counter;
|
|
apr_status_t status;
|
|
enum rb_methods {RB_INIT, RB_STREAM_CL, RB_STREAM_CHUNKED, RB_SPOOL_CL};
|
|
enum rb_methods rb_method = RB_INIT;
|
|
const char *old_cl_val = NULL;
|
|
const char *old_te_val = NULL;
|
|
apr_off_t bytes_read = 0;
|
|
apr_off_t bytes;
|
|
int force10;
|
|
apr_table_t *headers_in_copy;
|
|
|
|
header_brigade = apr_brigade_create(p, origin->bucket_alloc);
|
|
|
|
/*
|
|
* Send the HTTP/1.1 request to the remote server
|
|
*/
|
|
|
|
if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) {
|
|
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL);
|
|
force10 = 1;
|
|
p_conn->close++;
|
|
} else {
|
|
buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL);
|
|
force10 = 0;
|
|
}
|
|
if (apr_table_get(r->subprocess_env, "proxy-nokeepalive")) {
|
|
origin->keepalive = AP_CONN_CLOSE;
|
|
p_conn->close++;
|
|
}
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
|
|
if (conf->preserve_host == 0) {
|
|
if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) {
|
|
buf = apr_pstrcat(p, "Host: ", uri->hostname, ":", uri->port_str,
|
|
CRLF, NULL);
|
|
} else {
|
|
buf = apr_pstrcat(p, "Host: ", uri->hostname, CRLF, NULL);
|
|
}
|
|
}
|
|
else {
|
|
/* don't want to use r->hostname, as the incoming header might have a
|
|
* port attached
|
|
*/
|
|
const char* hostname = apr_table_get(r->headers_in,"Host");
|
|
if (!hostname) {
|
|
hostname = r->server->server_hostname;
|
|
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
|
|
"proxy: no HTTP 0.9 request (with no host line) "
|
|
"on incoming request and preserve host set "
|
|
"forcing hostname to be %s for uri %s",
|
|
hostname,
|
|
r->uri );
|
|
}
|
|
buf = apr_pstrcat(p, "Host: ", hostname, CRLF, NULL);
|
|
}
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
|
|
|
|
/* handle Via */
|
|
if (conf->viaopt == via_block) {
|
|
/* Block all outgoing Via: headers */
|
|
apr_table_unset(r->headers_in, "Via");
|
|
} else if (conf->viaopt != via_off) {
|
|
const char *server_name = ap_get_server_name(r);
|
|
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
|
|
* then the server name returned by ap_get_server_name() is the
|
|
* origin server name (which does make too much sense with Via: headers)
|
|
* so we use the proxy vhost's name instead.
|
|
*/
|
|
if (server_name == r->hostname)
|
|
server_name = r->server->server_hostname;
|
|
/* Create a "Via:" request header entry and merge it */
|
|
/* Generate outgoing Via: header with/without server comment: */
|
|
apr_table_mergen(r->headers_in, "Via",
|
|
(conf->viaopt == via_full)
|
|
? apr_psprintf(p, "%d.%d %s%s (%s)",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
server_name, server_portstr,
|
|
AP_SERVER_BASEVERSION)
|
|
: apr_psprintf(p, "%d.%d %s%s",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
server_name, server_portstr)
|
|
);
|
|
}
|
|
|
|
/* X-Forwarded-*: handling
|
|
*
|
|
* XXX Privacy Note:
|
|
* -----------------
|
|
*
|
|
* These request headers are only really useful when the mod_proxy
|
|
* is used in a reverse proxy configuration, so that useful info
|
|
* about the client can be passed through the reverse proxy and on
|
|
* to the backend server, which may require the information to
|
|
* function properly.
|
|
*
|
|
* In a forward proxy situation, these options are a potential
|
|
* privacy violation, as information about clients behind the proxy
|
|
* are revealed to arbitrary servers out there on the internet.
|
|
*
|
|
* The HTTP/1.1 Via: header is designed for passing client
|
|
* information through proxies to a server, and should be used in
|
|
* a forward proxy configuation instead of X-Forwarded-*. See the
|
|
* ProxyVia option for details.
|
|
*/
|
|
|
|
if (PROXYREQ_REVERSE == r->proxyreq) {
|
|
const char *buf;
|
|
|
|
/* Add X-Forwarded-For: so that the upstream has a chance to
|
|
* determine, where the original request came from.
|
|
*/
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-For",
|
|
c->remote_ip);
|
|
|
|
/* Add X-Forwarded-Host: so that upstream knows what the
|
|
* original request hostname was.
|
|
*/
|
|
if ((buf = apr_table_get(r->headers_in, "Host"))) {
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-Host", buf);
|
|
}
|
|
|
|
/* Add X-Forwarded-Server: so that upstream knows what the
|
|
* name of this proxy server is (if there are more than one)
|
|
* XXX: This duplicates Via: - do we strictly need it?
|
|
*/
|
|
apr_table_mergen(r->headers_in, "X-Forwarded-Server",
|
|
r->server->server_hostname);
|
|
}
|
|
|
|
proxy_run_fixups(r);
|
|
/*
|
|
* Make a copy of the headers_in table before clearing the connection
|
|
* headers as we need the connection headers later in the http output
|
|
* filter to prepare the correct response headers.
|
|
*
|
|
* Note: We need to take r->pool for apr_table_copy as the key / value
|
|
* pairs in r->headers_in have been created out of r->pool and
|
|
* p might be (and actually is) a longer living pool.
|
|
* This would trigger the bad pool ancestry abort in apr_table_copy if
|
|
* apr is compiled with APR_POOL_DEBUG.
|
|
*/
|
|
headers_in_copy = apr_table_copy(r->pool, r->headers_in);
|
|
ap_proxy_clear_connection(p, headers_in_copy);
|
|
/* send request headers */
|
|
headers_in_array = apr_table_elts(headers_in_copy);
|
|
headers_in = (const apr_table_entry_t *) headers_in_array->elts;
|
|
for (counter = 0; counter < headers_in_array->nelts; counter++) {
|
|
if (headers_in[counter].key == NULL
|
|
|| headers_in[counter].val == NULL
|
|
|
|
/* Already sent */
|
|
|| !strcasecmp(headers_in[counter].key, "Host")
|
|
|
|
/* Clear out hop-by-hop request headers not to send
|
|
* RFC2616 13.5.1 says we should strip these headers
|
|
*/
|
|
|| !strcasecmp(headers_in[counter].key, "Keep-Alive")
|
|
|| !strcasecmp(headers_in[counter].key, "TE")
|
|
|| !strcasecmp(headers_in[counter].key, "Trailer")
|
|
|| !strcasecmp(headers_in[counter].key, "Upgrade")
|
|
|
|
/* XXX: @@@ FIXME: "Proxy-Authorization" should *only* be
|
|
* suppressed if THIS server requested the authentication,
|
|
* not when a frontend proxy requested it!
|
|
*
|
|
* The solution to this problem is probably to strip out
|
|
* the Proxy-Authorisation header in the authorisation
|
|
* code itself, not here. This saves us having to signal
|
|
* somehow whether this request was authenticated or not.
|
|
*/
|
|
|| !strcasecmp(headers_in[counter].key,"Proxy-Authorization")
|
|
|| !strcasecmp(headers_in[counter].key,"Proxy-Authenticate")) {
|
|
continue;
|
|
}
|
|
|
|
/* Skip Transfer-Encoding and Content-Length for now.
|
|
*/
|
|
if (!strcasecmp(headers_in[counter].key, "Transfer-Encoding")) {
|
|
old_te_val = headers_in[counter].val;
|
|
continue;
|
|
}
|
|
if (!strcasecmp(headers_in[counter].key, "Content-Length")) {
|
|
old_cl_val = headers_in[counter].val;
|
|
continue;
|
|
}
|
|
|
|
/* for sub-requests, ignore freshness/expiry headers */
|
|
if (r->main) {
|
|
if ( !strcasecmp(headers_in[counter].key, "If-Match")
|
|
|| !strcasecmp(headers_in[counter].key, "If-Modified-Since")
|
|
|| !strcasecmp(headers_in[counter].key, "If-Range")
|
|
|| !strcasecmp(headers_in[counter].key, "If-Unmodified-Since")
|
|
|| !strcasecmp(headers_in[counter].key, "If-None-Match")) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
buf = apr_pstrcat(p, headers_in[counter].key, ": ",
|
|
headers_in[counter].val, CRLF,
|
|
NULL);
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
|
|
}
|
|
|
|
/* We have headers, let's figure out our request body... */
|
|
input_brigade = apr_brigade_create(p, bucket_alloc);
|
|
|
|
/* sub-requests never use keepalives, and mustn't pass request bodies.
|
|
* Because the new logic looks at input_brigade, we will self-terminate
|
|
* input_brigade and jump past all of the request body logic...
|
|
* Reading anything with ap_get_brigade is likely to consume the
|
|
* main request's body or read beyond EOS - which would be unplesant.
|
|
*/
|
|
if (r->main) {
|
|
/* XXX: Why DON'T sub-requests use keepalives? */
|
|
p_conn->close++;
|
|
if (old_cl_val) {
|
|
old_cl_val = NULL;
|
|
apr_table_unset(r->headers_in, "Content-Length");
|
|
}
|
|
if (old_te_val) {
|
|
old_te_val = NULL;
|
|
apr_table_unset(r->headers_in, "Transfer-Encoding");
|
|
}
|
|
rb_method = RB_STREAM_CL;
|
|
e = apr_bucket_eos_create(input_brigade->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(input_brigade, e);
|
|
goto skip_body;
|
|
}
|
|
|
|
/* WE only understand chunked. Other modules might inject
|
|
* (and therefore, decode) other flavors but we don't know
|
|
* that the can and have done so unless they they remove
|
|
* their decoding from the headers_in T-E list.
|
|
* XXX: Make this extensible, but in doing so, presume the
|
|
* encoding has been done by the extensions' handler, and
|
|
* do not modify add_te_chunked's logic
|
|
*/
|
|
if (old_te_val && strcmp(old_te_val, "chunked") != 0) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
|
|
"proxy: %s Transfer-Encoding is not supported",
|
|
old_te_val);
|
|
return APR_EINVAL;
|
|
}
|
|
|
|
if (old_cl_val && old_te_val) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_ENOTIMPL, r->server,
|
|
"proxy: client %s (%s) requested Transfer-Encoding "
|
|
"chunked body with Content-Length (C-L ignored)",
|
|
c->remote_ip, c->remote_host ? c->remote_host: "");
|
|
apr_table_unset(r->headers_in, "Content-Length");
|
|
old_cl_val = NULL;
|
|
origin->keepalive = AP_CONN_CLOSE;
|
|
p_conn->close++;
|
|
}
|
|
|
|
/* Prefetch MAX_MEM_SPOOL bytes
|
|
*
|
|
* This helps us avoid any election of C-L v.s. T-E
|
|
* request bodies, since we are willing to keep in
|
|
* memory this much data, in any case. This gives
|
|
* us an instant C-L election if the body is of some
|
|
* reasonable size.
|
|
*/
|
|
temp_brigade = apr_brigade_create(p, bucket_alloc);
|
|
do {
|
|
status = ap_get_brigade(r->input_filters, temp_brigade,
|
|
AP_MODE_READBYTES, APR_BLOCK_READ,
|
|
MAX_MEM_SPOOL - bytes_read);
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: prefetch request body failed to %pI (%s)"
|
|
" from %s (%s)",
|
|
p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
|
|
c->remote_ip, c->remote_host ? c->remote_host: "");
|
|
return status;
|
|
}
|
|
|
|
apr_brigade_length(temp_brigade, 1, &bytes);
|
|
bytes_read += bytes;
|
|
|
|
/*
|
|
* Save temp_brigade in input_brigade. (At least) in the SSL case
|
|
* temp_brigade contains transient buckets whose data would get
|
|
* overwritten during the next call of ap_get_brigade in the loop.
|
|
* ap_save_brigade ensures these buckets to be set aside.
|
|
* Calling ap_save_brigade with NULL as filter is OK, because
|
|
* input_brigade already has been created and does not need to get
|
|
* created by ap_save_brigade.
|
|
*/
|
|
status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p);
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: processing prefetched request body failed"
|
|
" to %pI (%s) from %s (%s)",
|
|
p_conn->addr, p_conn->hostname ? p_conn->hostname: "",
|
|
c->remote_ip, c->remote_host ? c->remote_host: "");
|
|
return status;
|
|
}
|
|
|
|
/* Ensure we don't hit a wall where we have a buffer too small
|
|
* for ap_get_brigade's filters to fetch us another bucket,
|
|
* surrender once we hit 80 bytes less than MAX_MEM_SPOOL
|
|
* (an arbitrary value.)
|
|
*/
|
|
} while ((bytes_read < MAX_MEM_SPOOL - 80)
|
|
&& !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)));
|
|
|
|
/* Use chunked request body encoding or send a content-length body?
|
|
*
|
|
* Prefer C-L when:
|
|
*
|
|
* We have no request body (handled by RB_STREAM_CL)
|
|
*
|
|
* We have a request body length <= MAX_MEM_SPOOL
|
|
*
|
|
* The administrator has setenv force-proxy-request-1.0
|
|
*
|
|
* The client sent a C-L body, and the administrator has
|
|
* not setenv proxy-sendchunked or has set setenv proxy-sendcl
|
|
*
|
|
* The client sent a T-E body, and the administrator has
|
|
* setenv proxy-sendcl, and not setenv proxy-sendchunked
|
|
*
|
|
* If both proxy-sendcl and proxy-sendchunked are set, the
|
|
* behavior is the same as if neither were set, large bodies
|
|
* that can't be read will be forwarded in their original
|
|
* form of C-L, or T-E.
|
|
*
|
|
* To ensure maximum compatibility, setenv proxy-sendcl
|
|
* To reduce server resource use, setenv proxy-sendchunked
|
|
*
|
|
* Then address specific servers with conditional setenv
|
|
* options to restore the default behavior where desireable.
|
|
*
|
|
* We have to compute content length by reading the entire request
|
|
* body; if request body is not small, we'll spool the remaining
|
|
* input to a temporary file. Chunked is always preferable.
|
|
*
|
|
* We can only trust the client-provided C-L if the T-E header
|
|
* is absent, and the filters are unchanged (the body won't
|
|
* be resized by another content filter).
|
|
*/
|
|
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) {
|
|
/* The whole thing fit, so our decision is trivial, use
|
|
* the filtered bytes read from the client for the request
|
|
* body Content-Length.
|
|
*
|
|
* If we expected no body, and read no body, do not set
|
|
* the Content-Length.
|
|
*/
|
|
if (old_cl_val || old_te_val || bytes_read) {
|
|
old_cl_val = apr_off_t_toa(r->pool, bytes_read);
|
|
}
|
|
rb_method = RB_STREAM_CL;
|
|
}
|
|
else if (old_te_val) {
|
|
if (force10
|
|
|| (apr_table_get(r->subprocess_env, "proxy-sendcl")
|
|
&& !apr_table_get(r->subprocess_env, "proxy-sendchunks"))) {
|
|
rb_method = RB_SPOOL_CL;
|
|
}
|
|
else {
|
|
rb_method = RB_STREAM_CHUNKED;
|
|
}
|
|
}
|
|
else if (old_cl_val) {
|
|
if (r->input_filters == r->proto_input_filters) {
|
|
rb_method = RB_STREAM_CL;
|
|
}
|
|
else if (!force10
|
|
&& apr_table_get(r->subprocess_env, "proxy-sendchunks")
|
|
&& !apr_table_get(r->subprocess_env, "proxy-sendcl")) {
|
|
rb_method = RB_STREAM_CHUNKED;
|
|
}
|
|
else {
|
|
rb_method = RB_SPOOL_CL;
|
|
}
|
|
}
|
|
else {
|
|
/* This is an appropriate default; very efficient for no-body
|
|
* requests, and has the behavior that it will not add any C-L
|
|
* when the old_cl_val is NULL.
|
|
*/
|
|
rb_method = RB_SPOOL_CL;
|
|
}
|
|
|
|
/* Yes I hate gotos. This is the subrequest shortcut */
|
|
skip_body:
|
|
/*
|
|
* Handle Connection: header if we do HTTP/1.1 request:
|
|
* If we plan to close the backend connection sent Connection: close
|
|
* otherwise sent Connection: Keep-Alive.
|
|
*/
|
|
if (!force10) {
|
|
if (p_conn->close) {
|
|
buf = apr_pstrdup(p, "Connection: close" CRLF);
|
|
}
|
|
else {
|
|
buf = apr_pstrdup(p, "Connection: Keep-Alive" CRLF);
|
|
}
|
|
ap_xlate_proto_to_ascii(buf, strlen(buf));
|
|
e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(header_brigade, e);
|
|
}
|
|
|
|
/* send the request body, if any. */
|
|
switch(rb_method) {
|
|
case RB_STREAM_CHUNKED:
|
|
status = stream_reqbody_chunked(p, r, p_conn, origin, header_brigade,
|
|
input_brigade);
|
|
break;
|
|
case RB_STREAM_CL:
|
|
status = stream_reqbody_cl(p, r, p_conn, origin, header_brigade,
|
|
input_brigade, old_cl_val);
|
|
break;
|
|
case RB_SPOOL_CL:
|
|
status = spool_reqbody_cl(p, r, p_conn, origin, header_brigade,
|
|
input_brigade, (old_cl_val != NULL)
|
|
|| (old_te_val != NULL)
|
|
|| (bytes_read > 0));
|
|
break;
|
|
default:
|
|
/* shouldn't be possible */
|
|
status = APR_EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, status, r->server,
|
|
"proxy: pass request body failed to %pI (%s)"
|
|
" from %s (%s)",
|
|
p_conn->addr,
|
|
p_conn->hostname ? p_conn->hostname: "",
|
|
c->remote_ip,
|
|
c->remote_host ? c->remote_host: "");
|
|
return status;
|
|
}
|
|
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static void process_proxy_header(request_rec* r, proxy_dir_conf* c,
|
|
const char* key, const char* value)
|
|
{
|
|
static const char* date_hdrs[]
|
|
= { "Date", "Expires", "Last-Modified", NULL } ;
|
|
static const struct {
|
|
const char* name;
|
|
ap_proxy_header_reverse_map_fn func;
|
|
} transform_hdrs[] = {
|
|
{ "Location", ap_proxy_location_reverse_map } ,
|
|
{ "Content-Location", ap_proxy_location_reverse_map } ,
|
|
{ "URI", ap_proxy_location_reverse_map } ,
|
|
{ "Destination", ap_proxy_location_reverse_map } ,
|
|
{ "Set-Cookie", ap_proxy_cookie_reverse_map } ,
|
|
{ NULL, NULL }
|
|
} ;
|
|
int i ;
|
|
for ( i = 0 ; date_hdrs[i] ; ++i ) {
|
|
if ( !strcasecmp(date_hdrs[i], key) ) {
|
|
apr_table_add(r->headers_out, key,
|
|
ap_proxy_date_canon(r->pool, value)) ;
|
|
return ;
|
|
}
|
|
}
|
|
for ( i = 0 ; transform_hdrs[i].name ; ++i ) {
|
|
if ( !strcasecmp(transform_hdrs[i].name, key) ) {
|
|
apr_table_add(r->headers_out, key,
|
|
(*transform_hdrs[i].func)(r, c, value)) ;
|
|
return ;
|
|
}
|
|
}
|
|
apr_table_add(r->headers_out, key, value) ;
|
|
return ;
|
|
}
|
|
|
|
/*
|
|
* Note: pread_len is the length of the response that we've mistakenly
|
|
* read (assuming that we don't consider that an error via
|
|
* ProxyBadHeader StartBody). This depends on buffer actually being
|
|
* local storage to the calling code in order for pread_len to make
|
|
* any sense at all, since we depend on buffer still containing
|
|
* what was read by ap_getline() upon return.
|
|
*/
|
|
static void ap_proxy_read_headers(request_rec *r, request_rec *rr,
|
|
char *buffer, int size,
|
|
conn_rec *c, int *pread_len)
|
|
{
|
|
int len;
|
|
char *value, *end;
|
|
char field[MAX_STRING_LEN];
|
|
int saw_headers = 0;
|
|
void *sconf = r->server->module_config;
|
|
proxy_server_conf *psc;
|
|
proxy_dir_conf *dconf;
|
|
|
|
dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
|
|
psc = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
|
|
|
|
r->headers_out = apr_table_make(r->pool, 20);
|
|
*pread_len = 0;
|
|
|
|
/*
|
|
* Read header lines until we get the empty separator line, a read error,
|
|
* the connection closes (EOF), or we timeout.
|
|
*/
|
|
while ((len = ap_getline(buffer, size, rr, 1)) > 0) {
|
|
|
|
if (!(value = strchr(buffer, ':'))) { /* Find the colon separator */
|
|
|
|
/* We may encounter invalid headers, usually from buggy
|
|
* MS IIS servers, so we need to determine just how to handle
|
|
* them. We can either ignore them, assume that they mark the
|
|
* start-of-body (eg: a missing CRLF) or (the default) mark
|
|
* the headers as totally bogus and return a 500. The sole
|
|
* exception is an extra "HTTP/1.0 200, OK" line sprinkled
|
|
* in between the usual MIME headers, which is a favorite
|
|
* IIS bug.
|
|
*/
|
|
/* XXX: The mask check is buggy if we ever see an HTTP/1.10 */
|
|
|
|
if (!apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
|
|
if (psc->badopt == bad_error) {
|
|
/* Nope, it wasn't even an extra HTTP header. Give up. */
|
|
r->headers_out = NULL;
|
|
return ;
|
|
}
|
|
else if (psc->badopt == bad_body) {
|
|
/* if we've already started loading headers_out, then
|
|
* return what we've accumulated so far, in the hopes
|
|
* that they are useful; also note that we likely pre-read
|
|
* the first line of the response.
|
|
*/
|
|
if (saw_headers) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
|
|
"proxy: Starting body due to bogus non-header in headers "
|
|
"returned by %s (%s)", r->uri, r->method);
|
|
*pread_len = len;
|
|
return ;
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
|
|
"proxy: No HTTP headers "
|
|
"returned by %s (%s)", r->uri, r->method);
|
|
return ;
|
|
}
|
|
}
|
|
}
|
|
/* this is the psc->badopt == bad_ignore case */
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
|
|
"proxy: Ignoring bogus HTTP header "
|
|
"returned by %s (%s)", r->uri, r->method);
|
|
continue;
|
|
}
|
|
|
|
*value = '\0';
|
|
++value;
|
|
/* XXX: RFC2068 defines only SP and HT as whitespace, this test is
|
|
* wrong... and so are many others probably.
|
|
*/
|
|
while (apr_isspace(*value))
|
|
++value; /* Skip to start of value */
|
|
|
|
/* should strip trailing whitespace as well */
|
|
for (end = &value[strlen(value)-1]; end > value && apr_isspace(*end); --
|
|
end)
|
|
*end = '\0';
|
|
|
|
/* make sure we add so as not to destroy duplicated headers
|
|
* Modify headers requiring canonicalisation and/or affected
|
|
* by ProxyPassReverse and family with process_proxy_header
|
|
*/
|
|
process_proxy_header(r, dconf, buffer, value) ;
|
|
saw_headers = 1;
|
|
|
|
/* the header was too long; at the least we should skip extra data */
|
|
if (len >= size - 1) {
|
|
while ((len = ap_getline(field, MAX_STRING_LEN, rr, 1))
|
|
>= MAX_STRING_LEN - 1) {
|
|
/* soak up the extra data */
|
|
}
|
|
if (len == 0) /* time to exit the larger loop as well */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static int addit_dammit(void *v, const char *key, const char *val)
|
|
{
|
|
apr_table_addn(v, key, val);
|
|
return 1;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxygetline(apr_bucket_brigade *bb, char *s, int n, request_rec *r,
|
|
int fold, int *writen)
|
|
{
|
|
char *tmp_s = s;
|
|
apr_status_t rv;
|
|
apr_size_t len;
|
|
|
|
rv = ap_rgetline(&tmp_s, n, &len, r, fold, bb);
|
|
apr_brigade_cleanup(bb);
|
|
|
|
if (rv == APR_SUCCESS) {
|
|
*writen = (int) len;
|
|
} else if (rv == APR_ENOSPC) {
|
|
*writen = n;
|
|
} else {
|
|
*writen = -1;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxy_http_process_response(apr_pool_t * p, request_rec *r,
|
|
proxy_conn_rec *backend,
|
|
conn_rec *origin,
|
|
proxy_server_conf *conf,
|
|
char *server_portstr) {
|
|
conn_rec *c = r->connection;
|
|
char buffer[HUGE_STRING_LEN];
|
|
const char *buf;
|
|
char keepchar;
|
|
request_rec *rp;
|
|
apr_bucket *e;
|
|
apr_bucket_brigade *bb, *tmp_bb;
|
|
int len, backasswards;
|
|
int interim_response; /* non-zero whilst interim 1xx responses
|
|
* are being read. */
|
|
int pread_len = 0;
|
|
apr_table_t *save_table;
|
|
int backend_broke = 0;
|
|
|
|
bb = apr_brigade_create(p, c->bucket_alloc);
|
|
|
|
/* Get response from the remote server, and pass it up the
|
|
* filter chain
|
|
*/
|
|
|
|
rp = ap_proxy_make_fake_req(origin, r);
|
|
/* In case anyone needs to know, this is a fake request that is really a
|
|
* response.
|
|
*/
|
|
rp->proxyreq = PROXYREQ_RESPONSE;
|
|
tmp_bb = apr_brigade_create(p, c->bucket_alloc);
|
|
do {
|
|
apr_status_t rc;
|
|
|
|
apr_brigade_cleanup(bb);
|
|
|
|
rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), rp, 0, &len);
|
|
if (len == 0) {
|
|
/* handle one potential stray CRLF */
|
|
rc = ap_proxygetline(tmp_bb, buffer, sizeof(buffer), rp, 0, &len);
|
|
}
|
|
if (len <= 0) {
|
|
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
|
|
"proxy: error reading status line from remote "
|
|
"server %s", backend->hostname);
|
|
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
|
|
"Error reading from remote server");
|
|
}
|
|
/* XXX: Is this a real headers length send from remote? */
|
|
backend->worker->s->read += len;
|
|
|
|
/* Is it an HTTP/1 response?
|
|
* This is buggy if we ever see an HTTP/1.10
|
|
*/
|
|
if (apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
|
|
int major, minor;
|
|
|
|
if (2 != sscanf(buffer, "HTTP/%u.%u", &major, &minor)) {
|
|
major = 1;
|
|
minor = 1;
|
|
}
|
|
/* If not an HTTP/1 message or
|
|
* if the status line was > 8192 bytes
|
|
*/
|
|
else if ((buffer[5] != '1') || (len >= sizeof(buffer)-1)) {
|
|
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
|
|
apr_pstrcat(p, "Corrupt status line returned by remote "
|
|
"server: ", buffer, NULL));
|
|
}
|
|
backasswards = 0;
|
|
|
|
keepchar = buffer[12];
|
|
buffer[12] = '\0';
|
|
r->status = atoi(&buffer[9]);
|
|
|
|
if (keepchar != '\0') {
|
|
buffer[12] = keepchar;
|
|
} else {
|
|
/* 2616 requires the space in Status-Line; the origin
|
|
* server may have sent one but ap_rgetline_core will
|
|
* have stripped it. */
|
|
buffer[12] = ' ';
|
|
buffer[13] = '\0';
|
|
}
|
|
r->status_line = apr_pstrdup(p, &buffer[9]);
|
|
|
|
|
|
/* read the headers. */
|
|
/* N.B. for HTTP/1.0 clients, we have to fold line-wrapped headers*/
|
|
/* Also, take care with headers with multiple occurences. */
|
|
|
|
/* First, tuck away all already existing cookies */
|
|
save_table = apr_table_make(r->pool, 2);
|
|
apr_table_do(addit_dammit, save_table, r->headers_out,
|
|
"Set-Cookie", NULL);
|
|
|
|
/* shove the headers direct into r->headers_out */
|
|
ap_proxy_read_headers(r, rp, buffer, sizeof(buffer), origin,
|
|
&pread_len);
|
|
|
|
if (r->headers_out == NULL) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
|
|
r->server, "proxy: bad HTTP/%d.%d header "
|
|
"returned by %s (%s)", major, minor, r->uri,
|
|
r->method);
|
|
backend->close += 1;
|
|
/*
|
|
* ap_send_error relies on a headers_out to be present. we
|
|
* are in a bad position here.. so force everything we send out
|
|
* to have nothing to do with the incoming packet
|
|
*/
|
|
r->headers_out = apr_table_make(r->pool,1);
|
|
r->status = HTTP_BAD_GATEWAY;
|
|
r->status_line = "bad gateway";
|
|
return r->status;
|
|
}
|
|
|
|
/* Now, add in the just read cookies */
|
|
apr_table_do(addit_dammit, save_table, r->headers_out,
|
|
"Set-Cookie", NULL);
|
|
|
|
/* and now load 'em all in */
|
|
if (!apr_is_empty_table(save_table)) {
|
|
apr_table_unset(r->headers_out, "Set-Cookie");
|
|
r->headers_out = apr_table_overlay(r->pool,
|
|
r->headers_out,
|
|
save_table);
|
|
}
|
|
|
|
/* can't have both Content-Length and Transfer-Encoding */
|
|
if (apr_table_get(r->headers_out, "Transfer-Encoding")
|
|
&& apr_table_get(r->headers_out, "Content-Length")) {
|
|
/*
|
|
* 2616 section 4.4, point 3: "if both Transfer-Encoding
|
|
* and Content-Length are received, the latter MUST be
|
|
* ignored";
|
|
*
|
|
* To help mitigate HTTP Splitting, unset Content-Length
|
|
* and shut down the backend server connection
|
|
* XXX: We aught to treat such a response as uncachable
|
|
*/
|
|
apr_table_unset(r->headers_out, "Content-Length");
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: server %s returned Transfer-Encoding"
|
|
" and Content-Length", backend->hostname);
|
|
backend->close += 1;
|
|
}
|
|
|
|
/* strip connection listed hop-by-hop headers from response */
|
|
backend->close += ap_proxy_liststr(apr_table_get(r->headers_out,
|
|
"Connection"),
|
|
"close");
|
|
ap_proxy_clear_connection(p, r->headers_out);
|
|
if ((buf = apr_table_get(r->headers_out, "Content-Type"))) {
|
|
ap_set_content_type(r, apr_pstrdup(p, buf));
|
|
}
|
|
ap_proxy_pre_http_request(origin,rp);
|
|
|
|
/* handle Via header in response */
|
|
if (conf->viaopt != via_off && conf->viaopt != via_block) {
|
|
const char *server_name = ap_get_server_name(r);
|
|
/* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host,
|
|
* then the server name returned by ap_get_server_name() is the
|
|
* origin server name (which does make too much sense with Via: headers)
|
|
* so we use the proxy vhost's name instead.
|
|
*/
|
|
if (server_name == r->hostname)
|
|
server_name = r->server->server_hostname;
|
|
/* create a "Via:" response header entry and merge it */
|
|
apr_table_mergen(r->headers_out, "Via",
|
|
(conf->viaopt == via_full)
|
|
? apr_psprintf(p, "%d.%d %s%s (%s)",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
server_name,
|
|
server_portstr,
|
|
AP_SERVER_BASEVERSION)
|
|
: apr_psprintf(p, "%d.%d %s%s",
|
|
HTTP_VERSION_MAJOR(r->proto_num),
|
|
HTTP_VERSION_MINOR(r->proto_num),
|
|
server_name,
|
|
server_portstr)
|
|
);
|
|
}
|
|
|
|
/* cancel keepalive if HTTP/1.0 or less */
|
|
if ((major < 1) || (minor < 1)) {
|
|
backend->close += 1;
|
|
origin->keepalive = AP_CONN_CLOSE;
|
|
}
|
|
} else {
|
|
/* an http/0.9 response */
|
|
backasswards = 1;
|
|
r->status = 200;
|
|
r->status_line = "200 OK";
|
|
backend->close += 1;
|
|
}
|
|
|
|
interim_response = ap_is_HTTP_INFO(r->status);
|
|
if (interim_response) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
|
|
"proxy: HTTP: received interim %d response",
|
|
r->status);
|
|
}
|
|
/* Moved the fixups of Date headers and those affected by
|
|
* ProxyPassReverse/etc from here to ap_proxy_read_headers
|
|
*/
|
|
|
|
if ((r->status == 401) && (conf->error_override)) {
|
|
const char *buf;
|
|
const char *wa = "WWW-Authenticate";
|
|
if ((buf = apr_table_get(r->headers_out, wa))) {
|
|
apr_table_set(r->err_headers_out, wa, buf);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: origin server sent 401 without WWW-Authenticate header");
|
|
}
|
|
}
|
|
|
|
r->sent_bodyct = 1;
|
|
/*
|
|
* Is it an HTTP/0.9 response or did we maybe preread the 1st line of
|
|
* the response? If so, load the extra data. These are 2 mutually
|
|
* exclusive possibilities, that just happen to require very
|
|
* similar behavior.
|
|
*/
|
|
if (backasswards || pread_len) {
|
|
apr_ssize_t cntr = (apr_ssize_t)pread_len;
|
|
if (backasswards) {
|
|
/*@@@FIXME:
|
|
* At this point in response processing of a 0.9 response,
|
|
* we don't know yet whether data is binary or not.
|
|
* mod_charset_lite will get control later on, so it cannot
|
|
* decide on the conversion of this buffer full of data.
|
|
* However, chances are that we are not really talking to an
|
|
* HTTP/0.9 server, but to some different protocol, therefore
|
|
* the best guess IMHO is to always treat the buffer as "text/x":
|
|
*/
|
|
ap_xlate_proto_to_ascii(buffer, len);
|
|
cntr = (apr_ssize_t)len;
|
|
}
|
|
e = apr_bucket_heap_create(buffer, cntr, NULL, c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
}
|
|
|
|
/* send body - but only if a body is expected */
|
|
if ((!r->header_only) && /* not HEAD request */
|
|
!interim_response && /* not any 1xx response */
|
|
(r->status != HTTP_NO_CONTENT) && /* not 204 */
|
|
(r->status != HTTP_NOT_MODIFIED)) { /* not 304 */
|
|
|
|
/* We need to copy the output headers and treat them as input
|
|
* headers as well. BUT, we need to do this before we remove
|
|
* TE, so that they are preserved accordingly for
|
|
* ap_http_filter to know where to end.
|
|
*/
|
|
rp->headers_in = apr_table_copy(r->pool, r->headers_out);
|
|
|
|
apr_table_unset(r->headers_out,"Transfer-Encoding");
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: start body send");
|
|
|
|
/*
|
|
* if we are overriding the errors, we can't put the content
|
|
* of the page into the brigade
|
|
*/
|
|
if (!conf->error_override || !ap_is_HTTP_ERROR(r->status)) {
|
|
/* read the body, pass it to the output filters */
|
|
apr_read_type_e mode = APR_NONBLOCK_READ;
|
|
int finish = FALSE;
|
|
|
|
do {
|
|
apr_off_t readbytes;
|
|
apr_status_t rv;
|
|
|
|
rv = ap_get_brigade(rp->input_filters, bb,
|
|
AP_MODE_READBYTES, mode,
|
|
conf->io_buffer_size);
|
|
|
|
/* ap_get_brigade will return success with an empty brigade
|
|
* for a non-blocking read which would block: */
|
|
if (APR_STATUS_IS_EAGAIN(rv)
|
|
|| (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb))) {
|
|
/* flush to the client and switch to blocking mode */
|
|
e = apr_bucket_flush_create(c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
if (ap_pass_brigade(r->output_filters, bb)
|
|
|| c->aborted) {
|
|
backend->close = 1;
|
|
break;
|
|
}
|
|
apr_brigade_cleanup(bb);
|
|
mode = APR_BLOCK_READ;
|
|
continue;
|
|
}
|
|
else if (rv == APR_EOF) {
|
|
break;
|
|
}
|
|
else if (rv != APR_SUCCESS) {
|
|
/* In this case, we are in real trouble because
|
|
* our backend bailed on us. Pass along a 502 error
|
|
* error bucket
|
|
*/
|
|
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c,
|
|
"proxy: error reading response");
|
|
ap_proxy_backend_broke(r, bb);
|
|
ap_pass_brigade(r->output_filters, bb);
|
|
backend_broke = 1;
|
|
backend->close = 1;
|
|
break;
|
|
}
|
|
/* next time try a non-blocking read */
|
|
mode = APR_NONBLOCK_READ;
|
|
|
|
apr_brigade_length(bb, 0, &readbytes);
|
|
backend->worker->s->read += readbytes;
|
|
#if DEBUGGING
|
|
{
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
|
|
r->server, "proxy (PID %d): readbytes: %#x",
|
|
getpid(), readbytes);
|
|
}
|
|
#endif
|
|
/* sanity check */
|
|
if (APR_BRIGADE_EMPTY(bb)) {
|
|
apr_brigade_cleanup(bb);
|
|
break;
|
|
}
|
|
|
|
/* found the last brigade? */
|
|
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
|
|
/* signal that we must leave */
|
|
finish = TRUE;
|
|
}
|
|
|
|
/* try send what we read */
|
|
if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS
|
|
|| c->aborted) {
|
|
/* Ack! Phbtt! Die! User aborted! */
|
|
backend->close = 1; /* this causes socket close below */
|
|
finish = TRUE;
|
|
}
|
|
|
|
/* make sure we always clean up after ourselves */
|
|
apr_brigade_cleanup(bb);
|
|
|
|
} while (!finish);
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: end body send");
|
|
}
|
|
else if (!interim_response) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: header only");
|
|
|
|
/* Pass EOS bucket down the filter chain. */
|
|
e = apr_bucket_eos_create(c->bucket_alloc);
|
|
APR_BRIGADE_INSERT_TAIL(bb, e);
|
|
if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS
|
|
|| c->aborted) {
|
|
/* Ack! Phbtt! Die! User aborted! */
|
|
backend->close = 1; /* this causes socket close below */
|
|
}
|
|
|
|
apr_brigade_cleanup(bb);
|
|
}
|
|
} while (interim_response);
|
|
|
|
/* If our connection with the client is to be aborted, return DONE. */
|
|
if (c->aborted || backend_broke) {
|
|
return DONE;
|
|
}
|
|
|
|
if (conf->error_override) {
|
|
/* the code above this checks for 'OK' which is what the hook expects */
|
|
if (!ap_is_HTTP_ERROR(r->status))
|
|
return OK;
|
|
else {
|
|
/* clear r->status for override error, otherwise ErrorDocument
|
|
* thinks that this is a recursive error, and doesn't find the
|
|
* custom error page
|
|
*/
|
|
int status = r->status;
|
|
r->status = HTTP_OK;
|
|
/* Discard body, if one is expected */
|
|
if ((status != HTTP_NO_CONTENT) && /* not 204 */
|
|
(status != HTTP_NOT_MODIFIED)) { /* not 304 */
|
|
ap_discard_request_body(rp);
|
|
}
|
|
return status;
|
|
}
|
|
} else
|
|
return OK;
|
|
}
|
|
|
|
static
|
|
apr_status_t ap_proxy_http_cleanup(const char *scheme, request_rec *r,
|
|
proxy_conn_rec *backend)
|
|
{
|
|
ap_proxy_release_connection(scheme, backend, r->server);
|
|
return OK;
|
|
}
|
|
|
|
/*
|
|
* This handles http:// URLs, and other URLs using a remote proxy over http
|
|
* If proxyhost is NULL, then contact the server directly, otherwise
|
|
* go via the proxy.
|
|
* Note that if a proxy is used, then URLs other than http: can be accessed,
|
|
* also, if we have trouble which is clearly specific to the proxy, then
|
|
* we return DECLINED so that we can try another proxy. (Or the direct
|
|
* route.)
|
|
*/
|
|
static int proxy_http_handler(request_rec *r, proxy_worker *worker,
|
|
proxy_server_conf *conf,
|
|
char *url, const char *proxyname,
|
|
apr_port_t proxyport)
|
|
{
|
|
int status;
|
|
char server_portstr[32];
|
|
char *scheme;
|
|
const char *proxy_function;
|
|
const char *u;
|
|
proxy_conn_rec *backend = NULL;
|
|
int is_ssl = 0;
|
|
|
|
/* Note: Memory pool allocation.
|
|
* A downstream keepalive connection is always connected to the existence
|
|
* (or not) of an upstream keepalive connection. If this is not done then
|
|
* load balancing against multiple backend servers breaks (one backend
|
|
* server ends up taking 100% of the load), and the risk is run of
|
|
* downstream keepalive connections being kept open unnecessarily. This
|
|
* keeps webservers busy and ties up resources.
|
|
*
|
|
* As a result, we allocate all sockets out of the upstream connection
|
|
* pool, and when we want to reuse a socket, we check first whether the
|
|
* connection ID of the current upstream connection is the same as that
|
|
* of the connection when the socket was opened.
|
|
*/
|
|
apr_pool_t *p = r->connection->pool;
|
|
conn_rec *c = r->connection;
|
|
apr_uri_t *uri = apr_palloc(r->connection->pool, sizeof(*uri));
|
|
|
|
/* find the scheme */
|
|
u = strchr(url, ':');
|
|
if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0')
|
|
return DECLINED;
|
|
if ((u - url) > 14)
|
|
return HTTP_BAD_REQUEST;
|
|
scheme = apr_pstrndup(c->pool, url, u - url);
|
|
/* scheme is lowercase */
|
|
ap_str_tolower(scheme);
|
|
/* is it for us? */
|
|
if (strcmp(scheme, "https") == 0) {
|
|
if (!ap_proxy_ssl_enable(NULL)) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTPS: declining URL %s"
|
|
" (mod_ssl not configured?)", url);
|
|
return DECLINED;
|
|
}
|
|
is_ssl = 1;
|
|
proxy_function = "HTTPS";
|
|
}
|
|
else if (!(strcmp(scheme, "http") == 0 || (strcmp(scheme, "ftp") == 0 && proxyname))) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTP: declining URL %s", url);
|
|
return DECLINED; /* only interested in HTTP, or FTP via proxy */
|
|
}
|
|
else {
|
|
if (*scheme == 'h')
|
|
proxy_function = "HTTP";
|
|
else
|
|
proxy_function = "FTP";
|
|
}
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
|
|
"proxy: HTTP: serving URL %s", url);
|
|
|
|
|
|
/* create space for state information */
|
|
if ((status = ap_proxy_acquire_connection(proxy_function, &backend,
|
|
worker, r->server)) != OK)
|
|
goto cleanup;
|
|
|
|
|
|
backend->is_ssl = is_ssl;
|
|
/*
|
|
* TODO: Currently we cannot handle persistent SSL backend connections,
|
|
* because we recreate backend->connection for each request and thus
|
|
* try to initialize an already existing SSL connection. This does
|
|
* not work.
|
|
*/
|
|
if (is_ssl)
|
|
backend->close = 1;
|
|
|
|
/* Step One: Determine Who To Connect To */
|
|
if ((status = ap_proxy_determine_connection(p, r, conf, worker, backend,
|
|
uri, &url, proxyname,
|
|
proxyport, server_portstr,
|
|
sizeof(server_portstr))) != OK)
|
|
goto cleanup;
|
|
|
|
/* Step Two: Make the Connection */
|
|
if (ap_proxy_connect_backend(proxy_function, backend, worker, r->server)) {
|
|
if (r->proxyreq == PROXYREQ_PROXY)
|
|
status = HTTP_NOT_FOUND;
|
|
else
|
|
status = HTTP_SERVICE_UNAVAILABLE;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Step Three: Create conn_rec */
|
|
if (!backend->connection) {
|
|
if ((status = ap_proxy_connection_create(proxy_function, backend,
|
|
c, r->server)) != OK)
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Step Four: Send the Request */
|
|
if ((status = ap_proxy_http_request(p, r, backend, backend->connection,
|
|
conf, uri, url, server_portstr)) != OK)
|
|
goto cleanup;
|
|
|
|
/* Step Five: Receive the Response */
|
|
if ((status = ap_proxy_http_process_response(p, r, backend,
|
|
backend->connection,
|
|
conf, server_portstr)) != OK)
|
|
goto cleanup;
|
|
|
|
/* Step Six: Clean Up */
|
|
|
|
cleanup:
|
|
if (backend) {
|
|
if (status != OK)
|
|
backend->close = 1;
|
|
ap_proxy_http_cleanup(proxy_function, r, backend);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static void ap_proxy_http_register_hook(apr_pool_t *p)
|
|
{
|
|
proxy_hook_scheme_handler(proxy_http_handler, NULL, NULL, APR_HOOK_FIRST);
|
|
proxy_hook_canon_handler(proxy_http_canon, NULL, NULL, APR_HOOK_FIRST);
|
|
}
|
|
|
|
module AP_MODULE_DECLARE_DATA proxy_http_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_http_register_hook/* register hooks */
|
|
};
|
|
|