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authorFelix Eckhofer <felix@eckhofer.com>2014-03-26 14:13:40 +0100
committerFelix Eckhofer <felix@eckhofer.com>2014-03-26 20:44:16 +0100
commitef721fc430fbb19da13060105577bf7605606b81 (patch)
tree39e9c72efb345dc513e27dbfec1a71a14bb3cc01 /program/lib
parent3fca238554c90c51e8bc694bc280e0c117958b85 (diff)
Add config variable 'proxy_whitelist'
HTTP headers X_FORWARDED_* and X_REAL_IP are only evaluated when received from an IP listed in proxy_whitelist. Furthermore, only the last non-trusted IP from X-Forwarded-For is used in place of the real ip. Without this, an attacker can easily spoof the headers and control the result of the ip or ssl check. This fixes several problems with [3a4c9f42], [4d480b36] and [a520f331] as mentioned in #1489729.
Diffstat (limited to 'program/lib')
-rw-r--r--program/lib/Roundcube/rcube_utils.php25
1 files changed, 18 insertions, 7 deletions
diff --git a/program/lib/Roundcube/rcube_utils.php b/program/lib/Roundcube/rcube_utils.php
index 46d53ac91..4a183bd79 100644
--- a/program/lib/Roundcube/rcube_utils.php
+++ b/program/lib/Roundcube/rcube_utils.php
@@ -598,7 +598,9 @@ class rcube_utils
if (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) != 'off') {
return true;
}
- if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https') {
+ if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO'])
+ && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https'
+ && in_array($_SERVER['REMOTE_ADDR'], rcube::get_instance()->config->get('proxy_whitelist', array()))) {
return true;
}
if ($port && $_SERVER['SERVER_PORT'] == $port) {
@@ -683,13 +685,22 @@ class rcube_utils
*/
public static function remote_addr()
{
- if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
- $hosts = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'], 2);
- return $hosts[0];
- }
+ // Check if any of the headers are set first to improve performance
+ if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) || !empty($_SERVER['HTTP_X_REAL_IP'])) {
+ $proxy_whitelist = rcube::get_instance()->config->get('proxy_whitelist', array());
+ if (in_array($_SERVER['REMOTE_ADDR'], $proxy_whitelist)) {
+ if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+ foreach(array_reverse(explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])) as $forwarded_ip) {
+ if (!in_array($forwarded_ip, $proxy_whitelist)) {
+ return $forwarded_ip;
+ }
+ }
+ }
- if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
- return $_SERVER['HTTP_X_REAL_IP'];
+ if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
+ return $_SERVER['HTTP_X_REAL_IP'];
+ }
+ }
}
if (!empty($_SERVER['REMOTE_ADDR'])) {