1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/* ====================================================================
* Copyright (c) 1995 The Apache Group. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP OR
* IT'S 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 Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/*
* $Id: mod_rpaf-2.0.c,v 1.1 2002/06/08 19:25:06 thomas Exp $
*
* Author: Thomas Eibner, <thomas@stderr.net>
* URL: http://stderr.net/apache/rpaf/
* rpaf is short for reverse proxy add forward
*
* This module does the opposite of mod_proxy_add_forward written by
* Ask Bjørn Hansen. http://develooper.com/code/mpaf/ or mod_proxy
* in 1.3.25 and above and mod_proxy from Apache 2.0
*
*/
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_vhost.h"
#include "apr_strings.h"
module AP_MODULE_DECLARE_DATA rpaf_module;
typedef struct {
int enable;
int sethostname;
apr_array_header_t *proxy_ips;
} rpaf_server_cfg;
static void *rpaf_create_server_cfg(apr_pool_t *p, server_rec *s) {
rpaf_server_cfg *cfg = (rpaf_server_cfg *)apr_pcalloc(p, sizeof(rpaf_server_cfg));
if (!cfg)
return NULL;
cfg->proxy_ips = apr_array_make(p, 0, sizeof(char *));
cfg->enable = 0;
cfg->sethostname = 0;
return (void *)cfg;
}
static const char *rpaf_set_proxy_ip(cmd_parms *cmd, void *dummy, char *proxy_ip) {
server_rec *s = cmd->server;
rpaf_server_cfg *cfg = (rpaf_server_cfg *)ap_get_module_config(s->module_config,
&rpaf_module);
/* check for valid syntax of ip */
*(char **)apr_array_push(cfg->proxy_ips) = apr_pstrdup(cmd->pool, proxy_ip);
return NULL;
}
static const char *rpaf_enable(cmd_parms *cmd, void *dummy, int flag) {
server_rec *s = cmd->server;
rpaf_server_cfg *cfg = (rpaf_server_cfg *)ap_get_module_config(s->module_config,
&rpaf_module);
cfg->enable = flag;
return NULL;
}
static const char *rpaf_sethostname(cmd_parms *cmd, void *dummy, int flag) {
server_rec *s = cmd->server;
rpaf_server_cfg *cfg = (rpaf_server_cfg *)ap_get_module_config(s->module_config,
&rpaf_module);
cfg->sethostname = flag;
return NULL;
}
static int is_in_array(const char *remote_ip, apr_array_header_t *proxy_ips) {
int i;
char **list = (char**)proxy_ips->elts;
for (i = 0; i < proxy_ips->nelts; i++) {
if (strcmp(remote_ip, list[i]) == 0)
return 1;
}
return 0;
}
static int change_remote_ip(request_rec *r) {
const char *fwdvalue;
char *val;
rpaf_server_cfg *cfg = (rpaf_server_cfg *)ap_get_module_config(r->server->module_config,
&rpaf_module);
if (!cfg->enable)
return DECLINED;
if (is_in_array(r->connection->remote_ip, cfg->proxy_ips) == 1) {
if (fwdvalue = apr_table_get(r->headers_in, "X-Forwarded-For")) {
apr_array_header_t *arr = apr_array_make(r->pool, 0, sizeof(char*));
while (*fwdvalue && (val = ap_get_token(r->pool, &fwdvalue, 1))) {
*(char **)apr_array_push(arr) = apr_pstrdup(r->pool, val);
if (*fwdvalue != '\0')
++fwdvalue;
}
r->connection->remote_ip = apr_pstrdup(r->connection->pool, ((char **)arr->elts)[((arr->nelts)-1)]);
r->connection->remote_addr->sa.sin.sin_addr.s_addr = inet_addr(r->connection->remote_ip);
if (cfg->sethostname) {
const char *hostvalue;
if (hostvalue = apr_table_get(r->headers_in, "X-Forwarded-Host")) {
/* 2.0 proxy frontend or 1.3 => 1.3.25 proxy frontend */
apr_table_set(r->headers_in, "Host", apr_pstrdup(r->pool, hostvalue));
r->hostname = apr_pstrdup(r->pool, hostvalue);
ap_update_vhost_from_headers(r);
} else if (hostvalue = apr_table_get(r->headers_in, "X-Host")) {
/* 1.3 proxy frontend with mod_proxy_add_forward */
apr_table_set(r->headers_in, "Host", apr_pstrdup(r->pool, hostvalue));
r->hostname = apr_pstrdup(r->pool, hostvalue);
ap_update_vhost_from_headers(r);
}
}
}
}
return DECLINED;
}
static const command_rec rpaf_cmds[] = {
AP_INIT_FLAG(
"RPAFenable",
rpaf_enable,
NULL,
RSRC_CONF,
"Enable mod_rpaf"
),
AP_INIT_FLAG(
"RPAFsethostname",
rpaf_sethostname,
NULL,
RSRC_CONF,
"Let mod_rpaf set the hostname from X-Host header and update vhosts"
),
AP_INIT_ITERATE(
"RPAFproxy_ips",
rpaf_set_proxy_ip,
NULL,
RSRC_CONF,
"IP(s) of Proxy server setting X-Forwarded-For header"
),
{ NULL }
};
static void register_hooks(apr_pool_t *p) {
ap_hook_post_read_request(change_remote_ip, NULL, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA rpaf_module = {
STANDARD20_MODULE_STUFF,
NULL,
NULL,
rpaf_create_server_cfg,
NULL,
rpaf_cmds,
register_hooks,
};
|