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e27ddf4facf833be616de615dec7fe9803490bb7
apache/modules/proxy/proxy_http.c
Graham Leggett 8f6431df56 Header Bugfix / General Cleanups in ap_proxy_http_handler / X-Forwarded-* headers 
PR:
Obtained from:
Reviewed by:	Chuck Murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88579 13f79535-47bb-0310-9956-ffa450edef68
2001-03-25 20:23:25 +00:00

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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/* HTTP routines for Apache proxy */
#define CORE_PRIVATE
#include "mod_proxy.h"
#include "apr_strings.h"
#include "apr_buckets.h"
#include "util_filter.h"
#include "ap_config.h"
#include "http_log.h"
#include "http_main.h"
#include "http_core.h"
#include "http_connection.h"
#include "util_date.h"
/*
* Canonicalise http-like URLs.
* scheme is the scheme for the URL
* url is the URL starting with the first '/'
* def_port is the default port for this scheme.
*/
int ap_proxy_http_canon(request_rec *r, char *url, const char *scheme, int def_port)
{
char *host, *path, *search, sport[7];
const char *err;
int port;
/* do syntatic check.
* We break the URL into host, port, path, search
*/
port = def_port;
err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
if (err)
return HTTP_BAD_REQUEST;
/* now parse path/search args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL _path_
* has already been decoded. True proxy requests have r->uri
* == r->unparsed_uri, and no others have that property.
*/
if (r->uri == r->unparsed_uri) {
search = strchr(url, '?');
if (search != NULL)
*(search++) = '\0';
}
else
search = r->args;
/* process path */
path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (port != def_port)
apr_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "://", host, sport, "/",
path, (search) ? "?" : "", (search) ? search : "", NULL);
return OK;
}
static const char *ap_proxy_location_reverse_map(request_rec *r, const char *url)
{
void *sconf;
proxy_server_conf *conf;
struct proxy_alias *ent;
int i, l1, l2;
char *u;
/* XXX FIXME: Make sure this handled the ambiguous case of the :80
* after the hostname */
sconf = r->server->module_config;
conf = (proxy_server_conf *)ap_get_module_config(sconf, &proxy_module);
l1 = strlen(url);
ent = (struct proxy_alias *)conf->raliases->elts;
for (i = 0; i < conf->raliases->nelts; i++) {
l2 = strlen(ent[i].real);
if (l1 >= l2 && strncmp(ent[i].real, url, l2) == 0) {
u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL);
return ap_construct_url(r->pool, u, r);
}
}
return url;
}
/* Clear all connection-based headers from the incoming headers table */
static void ap_proxy_clear_connection(apr_pool_t *p, apr_table_t *headers)
{
const char *name;
char *next = apr_pstrdup(p, apr_table_get(headers, "Connection"));
apr_table_unset(headers, "Proxy-Connection");
if (!next)
return;
while (*next) {
name = next;
while (*next && !apr_isspace(*next) && (*next != ','))
++next;
while (*next && (apr_isspace(*next) || (*next == ','))) {
*next = '\0';
++next;
}
apr_table_unset(headers, name);
}
apr_table_unset(headers, "Connection");
}
/*
* 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.)
*/
int ap_proxy_http_handler(request_rec *r, char *url,
const char *proxyhost, int proxyport)
{
apr_pool_t *p = r->pool;
char *desthost;
int destport = 0;
char *destportstr = NULL;
char server_portstr[32];
const char *uri = NULL;
apr_socket_t *sock;
int i, len, backasswards;
apr_status_t err;
apr_array_header_t *headers_in_array;
apr_table_entry_t *headers_in;
struct sockaddr_in server;
struct in_addr destaddr;
char buffer[HUGE_STRING_LEN];
char *response;
char *buf;
conn_rec *origin;
apr_bucket *e;
apr_bucket_brigade *bb = apr_brigade_create(p);
void *sconf = r->server->module_config;
proxy_server_conf *conf =
(proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
memset(&server, '\0', sizeof(server));
server.sin_family = AF_INET;
/* We break the URL into host, port, uri */
{
const char *buf;
uri = strstr(url, "://");
if (uri == NULL)
return HTTP_BAD_REQUEST;
uri += 3;
destport = DEFAULT_HTTP_PORT;
buf = ap_strchr_c(uri, '/');
if (buf == NULL) {
desthost = apr_pstrdup(p, uri);
uri = "/";
}
else {
char *q = apr_palloc(p, buf - uri + 1);
memcpy(q, uri, buf - uri);
q[buf - uri] = '\0';
uri = buf;
desthost = q;
}
}
/* Get the port number - put it in destport and destportstr */
{
char *buf;
buf = ap_strchr(desthost, ':');
if (buf != NULL) {
*(buf++) = '\0';
if (apr_isdigit(*buf)) {
destport = atoi(buf);
destportstr = buf;
}
}
}
/* Get the server port for the Via headers */
{
i = ap_get_server_port(r);
if (ap_is_default_port(i,r)) {
strcpy(server_portstr,"");
} else {
apr_snprintf(server_portstr, sizeof server_portstr, ":%d", i);
}
}
/* check if ProxyBlock directive on this host */
destaddr.s_addr = apr_inet_addr(desthost);
for (i = 0; i < conf->noproxies->nelts; i++) {
if ((npent[i].name != NULL
&& ap_strstr_c(desthost, npent[i].name) != NULL)
|| destaddr.s_addr == npent[i].addr.s_addr
|| npent[i].name[0] == '*')
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
if ((apr_socket_create(&sock, APR_INET, SOCK_STREAM, p)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"proxy: error creating socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
#if !defined(TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0 && apr_setsocketopt(sock, APR_SO_RCVBUF,
conf->recv_buffer_size)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
#endif
if (proxyhost != NULL) {
err = ap_proxy_doconnect(sock, (char *)proxyhost, proxyport, r);
}
else {
err = ap_proxy_doconnect(sock, (char *)desthost, destport, r);
}
if (err != APR_SUCCESS) {
if (proxyhost != NULL)
return DECLINED; /* try again another way */
else
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p,
"Could not connect to remote machine: ",
desthost, NULL));
}
origin = ap_new_connection(p, r->server, sock, 0);
if (!origin) {
/* the peer reset the connection already; ap_new_connection()
* closed the socket */
/* XXX somebody that knows what they're doing add an error path */
/* XXX how's this? */
return ap_proxyerror(r, HTTP_BAD_GATEWAY, apr_pstrcat(p,
"Connection reset by peer: ",
desthost, NULL));
}
ap_add_output_filter("CORE", NULL, NULL, origin);
/* strip connection listed hop-by-hop headers from the request */
ap_proxy_clear_connection(p, r->headers_in);
buf = apr_pstrcat(p, r->method, " ", proxyhost ? url : uri,
" HTTP/1.1" CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
if (destportstr != NULL && destport != DEFAULT_HTTP_PORT) {
buf = apr_pstrcat(p, "Host: ", desthost, ":", destportstr, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
else {
buf = apr_pstrcat(p, "Host: ", desthost, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, 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) {
/* 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),
ap_get_server_name(r), server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
ap_get_server_name(r), 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", r->connection->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);
}
/* send request headers */
headers_in_array = apr_table_elts(r->headers_in);
headers_in = (apr_table_entry_t *) headers_in_array->elts;
for (i = 0; i < headers_in_array->nelts; i++) {
if (headers_in[i].key == NULL || headers_in[i].val == NULL
/* Clear out hop-by-hop request headers not to send
* RFC2616 13.5.1 says we should strip these headers
*/
|| !strcasecmp(headers_in[i].key, "Host") /* Already sent */
|| !strcasecmp(headers_in[i].key, "Keep-Alive")
|| !strcasecmp(headers_in[i].key, "TE")
|| !strcasecmp(headers_in[i].key, "Trailer")
|| !strcasecmp(headers_in[i].key, "Transfer-Encoding")
|| !strcasecmp(headers_in[i].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[i].key, "Proxy-Authorization")
|| !strcasecmp(headers_in[i].key, "Proxy-Authenticate"))
continue;
buf = apr_pstrcat(p, headers_in[i].key, ": ", headers_in[i].val, CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
/* we don't yet support keepalives - but we will soon, I promise! */
buf = apr_pstrcat(p, "Connection: close", CRLF, NULL);
e = apr_bucket_pool_create(buf, strlen(buf), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
/* add empty line at the end of the headers */
e = apr_bucket_pool_create(CRLF, strlen(CRLF), p);
APR_BRIGADE_INSERT_TAIL(bb, e);
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
/* send the request data, if any. */
if (ap_should_client_block(r)) {
while ((i = ap_get_client_block(r, buffer, sizeof buffer)) > 0) {
e = apr_bucket_pool_create(buffer, i, p);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
}
/* Flush the data to the origin server */
e = apr_bucket_flush_create();
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(origin->output_filters, bb);
ap_add_input_filter("HTTP_IN", NULL, NULL, origin);
ap_add_input_filter("CORE_IN", NULL, NULL, origin);
apr_brigade_destroy(bb);
bb = apr_brigade_create(p);
/* Tell http_filter to grab the data one line at a time. */
origin->remain = 0;
ap_get_brigade(origin->input_filters, bb, AP_MODE_BLOCKING);
e = APR_BRIGADE_FIRST(bb);
apr_bucket_read(e, (const char **)&response, &len, APR_BLOCK_READ);
if (len == -1) {
apr_socket_close(sock);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"ap_get_brigade() - proxy receive - Error reading from remote server %s (length %d)",
proxyhost ? proxyhost : desthost, len);
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
} else if (len == 0) {
apr_socket_close(sock);
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Document contains no data");
}
APR_BUCKET_REMOVE(e);
apr_bucket_destroy(e);
/* Is it an HTTP/1 response? This is buggy if we ever see an HTTP/1.10 */
if (ap_checkmask(response, "HTTP/#.# ###*")) {
int major, minor;
if (2 != sscanf(response, "HTTP/%u.%u", &major, &minor)) {
major = 1;
minor = 1;
}
/* If not an HTTP/1 message or if the status line was > 8192 bytes */
if (response[5] != '1' || response[len - 1] != '\n') {
apr_socket_close(sock);
return HTTP_BAD_GATEWAY;
}
backasswards = 0;
response[--len] = '\0';
response[12] = '\0';
r->status = atoi(&response[9]);
response[12] = ' ';
r->status_line = apr_pstrdup(p, &response[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. */
r->headers_out = ap_proxy_read_headers(r, buffer, HUGE_STRING_LEN, origin);
if (r->headers_out == NULL) {
ap_log_error(APLOG_MARK, APLOG_WARNING|APLOG_NOERRNO, 0, r->server,
"proxy: Bad HTTP/%d.%d header returned by %s (%s)",
major, minor, r->uri, r->method);
}
else
{
/* strip connection listed hop-by-hop headers from response */
const char *buf;
ap_proxy_clear_connection(p, r->headers_out);
if ((buf = apr_table_get(r->headers_out, "Content-type"))) {
r->content_type = apr_pstrdup(p, buf);
}
}
/* handle Via header in response */
if (conf->viaopt != via_off && conf->viaopt != via_block) {
/* Create a "Via:" response header entry and merge it */
ap_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),
ap_get_server_name(r), server_portstr,
AP_SERVER_BASEVERSION)
: apr_psprintf(p, "%d.%d %s%s",
HTTP_VERSION_MAJOR(r->proto_num),
HTTP_VERSION_MINOR(r->proto_num),
ap_get_server_name(r), server_portstr)
);
}
}
else {
/* an http/0.9 response */
backasswards = 1;
r->status = 200;
r->status_line = "200 OK";
}
/* munge the Location and URI response headers according to ProxyPassReverse */
{
const char *buf;
if ((buf = apr_table_get(r->headers_out, "Location")) != NULL)
apr_table_set(r->headers_out, "Location", ap_proxy_location_reverse_map(r, buf));
if ((buf = apr_table_get(r->headers_out, "Content-Location")) != NULL)
apr_table_set(r->headers_out, "Content-Location", ap_proxy_location_reverse_map(r, buf));
if ((buf = apr_table_get(r->headers_out, "URI")) != NULL)
apr_table_set(r->headers_out, "URI", ap_proxy_location_reverse_map(r, buf));
}
r->sent_bodyct = 1;
/* Is it an HTTP/0.9 response? If so, send the extra data */
if (backasswards) {
apr_ssize_t cntr = len;
/* FIXME: what is buffer used for here? It is of limited size */
e = apr_bucket_heap_create(buffer, cntr, 0, NULL);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
/* send body */
/* HTTP/1.0 tells us to read to EOF, rather than content-length bytes */
if (!r->header_only) {
origin->remain = -1;
while (ap_get_brigade(origin->input_filters, bb, AP_MODE_BLOCKING) == APR_SUCCESS) {
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
ap_pass_brigade(r->output_filters, bb);
break;
}
ap_pass_brigade(r->output_filters, bb);
apr_brigade_destroy(bb);
bb = apr_brigade_create(p);
}
}
apr_socket_close(sock);
return OK;
}
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