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
210
211
212
213
214
215
216
217
|
<?php
/**
* Functions for dealing with proxies
* @package MediaWiki
*/
function wfGetForwardedFor() {
if( function_exists( 'apache_request_headers' ) ) {
// More reliable than $_SERVER due to case and -/_ folding
$set = apache_request_headers();
$index = 'X-Forwarded-For';
} else {
// Subject to spoofing with headers like X_Forwarded_For
$set = $_SERVER;
$index = 'HTTP_X_FORWARDED_FOR';
}
if( isset( $set[$index] ) ) {
return $set[$index];
} else {
return null;
}
}
/** Work out the IP address based on various globals */
function wfGetIP() {
global $wgIP;
# Return cached result
if ( !empty( $wgIP ) ) {
return $wgIP;
}
/* collect the originating ips */
# Client connecting to this webserver
if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
$ipchain = array( IP::canonicalize( $_SERVER['REMOTE_ADDR'] ) );
} else {
# Running on CLI?
$ipchain = array( '127.0.0.1' );
}
$ip = $ipchain[0];
# Append XFF on to $ipchain
$forwardedFor = wfGetForwardedFor();
if ( isset( $forwardedFor ) ) {
$xff = array_map( 'trim', explode( ',', $forwardedFor ) );
$xff = array_reverse( $xff );
$ipchain = array_merge( $ipchain, $xff );
}
# Step through XFF list and find the last address in the list which is a trusted server
# Set $ip to the IP address given by that trusted server, unless the address is not sensible (e.g. private)
foreach ( $ipchain as $i => $curIP ) {
$curIP = IP::canonicalize( $curIP );
if ( wfIsTrustedProxy( $curIP ) ) {
if ( isset( $ipchain[$i + 1] ) && IP::isPublic( $ipchain[$i + 1] ) ) {
$ip = $ipchain[$i + 1];
}
} else {
break;
}
}
wfDebug( "IP: $ip\n" );
$wgIP = $ip;
return $ip;
}
function wfIsTrustedProxy( $ip ) {
global $wgSquidServers, $wgSquidServersNoPurge;
if ( in_array( $ip, $wgSquidServers ) ||
in_array( $ip, $wgSquidServersNoPurge ) ||
wfIsAOLProxy( $ip )
) {
$trusted = true;
} else {
$trusted = false;
}
wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
return $trusted;
}
/**
* Forks processes to scan the originating IP for an open proxy server
* MemCached can be used to skip IPs that have already been scanned
*/
function wfProxyCheck() {
global $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath;
global $wgUseMemCached, $wgMemc, $wgProxyMemcExpiry;
global $wgProxyKey;
if ( !$wgBlockOpenProxies ) {
return;
}
$ip = wfGetIP();
# Get MemCached key
$skip = false;
if ( $wgUseMemCached ) {
$mcKey = wfMemcKey( 'proxy', 'ip', $ip );
$mcValue = $wgMemc->get( $mcKey );
if ( $mcValue ) {
$skip = true;
}
}
# Fork the processes
if ( !$skip ) {
$title = SpecialPage::getTitleFor( 'Blockme' );
$iphash = md5( $ip . $wgProxyKey );
$url = $title->getFullURL( 'ip='.$iphash );
foreach ( $wgProxyPorts as $port ) {
$params = implode( ' ', array(
escapeshellarg( $wgProxyScriptPath ),
escapeshellarg( $ip ),
escapeshellarg( $port ),
escapeshellarg( $url )
));
exec( "php $params &>/dev/null &" );
}
# Set MemCached key
if ( $wgUseMemCached ) {
$wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
}
}
}
/**
* Convert a network specification in CIDR notation to an integer network and a number of bits
*/
function wfParseCIDR( $range ) {
return IP::parseCIDR( $range );
}
/**
* Check if an IP address is in the local proxy list
*/
function wfIsLocallyBlockedProxy( $ip ) {
global $wgProxyList;
$fname = 'wfIsLocallyBlockedProxy';
if ( !$wgProxyList ) {
return false;
}
wfProfileIn( $fname );
if ( !is_array( $wgProxyList ) ) {
# Load from the specified file
$wgProxyList = array_map( 'trim', file( $wgProxyList ) );
}
if ( !is_array( $wgProxyList ) ) {
$ret = false;
} elseif ( array_search( $ip, $wgProxyList ) !== false ) {
$ret = true;
} elseif ( array_key_exists( $ip, $wgProxyList ) ) {
# Old-style flipped proxy list
$ret = true;
} else {
$ret = false;
}
wfProfileOut( $fname );
return $ret;
}
/**
* TODO: move this list to the database in a global IP info table incorporating
* trusted ISP proxies, blocked IP addresses and open proxies.
*/
function wfIsAOLProxy( $ip ) {
$ranges = array(
'64.12.96.0/19',
'149.174.160.0/20',
'152.163.240.0/21',
'152.163.248.0/22',
'152.163.252.0/23',
'152.163.96.0/22',
'152.163.100.0/23',
'195.93.32.0/22',
'195.93.48.0/22',
'195.93.64.0/19',
'195.93.96.0/19',
'195.93.16.0/20',
'198.81.0.0/22',
'198.81.16.0/20',
'198.81.8.0/23',
'202.67.64.128/25',
'205.188.192.0/20',
'205.188.208.0/23',
'205.188.112.0/20',
'205.188.146.144/30',
'207.200.112.0/21',
);
static $parsedRanges;
if ( is_null( $parsedRanges ) ) {
$parsedRanges = array();
foreach ( $ranges as $range ) {
$parsedRanges[] = IP::parseRange( $range );
}
}
$hex = IP::toHex( $ip );
foreach ( $parsedRanges as $range ) {
if ( $hex >= $range[0] && $hex <= $range[1] ) {
return true;
}
}
return false;
}
?>
|
