X-Git-Url: https://vcs.fsf.org/?p=squirrelmail.git;a=blobdiff_plain;f=functions%2Fauth.php;h=fbc28e06ba0d98dc0327196844d8ab2f06d3605b;hp=53b96d9f717e27ee90ef326bc99bb62dfe9fa452;hb=8747058aeaa16ece0107b756645abcb8f8a32b5b;hpb=0940b016e1d622661909f2787ceebe468b04a8bc

diff --git a/functions/auth.php b/functions/auth.php
index 53b96d9f..fbc28e06 100644
--- a/functions/auth.php
+++ b/functions/auth.php
@@ -9,7 +9,7 @@
  *  functions/global.php
  *  functions/strings.php.
  *
- * @copyright © 1999-2007 The SquirrelMail Project Team
+ * @copyright 1999-2010 The SquirrelMail Project Team
  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
  * @version $Id$
  * @package squirrelmail
@@ -24,13 +24,44 @@
  * and PAGE_NAME in session and returns false. POST information is saved in
  * 'session_expired_post' variable, PAGE_NAME is saved in 'session_expired_location'.
  *
+ * This function optionally checks the referrer of this page request.  If the
+ * administrator wants to impose a check that the referrer of this page request
+ * is another page on the same domain (otherwise, the page request is likely
+ * the result of a XSS or phishing attack), then they need to specify the
+ * acceptable referrer domain in a variable named $check_referrer in
+ * config/config.php (or the configuration tool) for which the value is
+ * usually the same as the $domain setting (for example:
+ *    $check_referrer = 'example.com';
+ * However, in some cases (where proxy servers are in use, etc.), the
+ * acceptable referrer might be different.  If $check_referrer is set to
+ * "###DOMAIN###", then the current value of $domain is used (useful in
+ * situations where $domain might change at runtime (when using the Login
+ * Manager plugin to host multiple domains with one SquirrelMail installation,
+ * for example)):
+ *    $check_referrer = '###DOMAIN###';
+ * NOTE HOWEVER, that referrer checks are not foolproof - they can be spoofed
+ * by browsers, and some browsers intentionally don't send them, in which
+ * case SquirrelMail silently ignores referrer checks.  
+ *
  * Script that uses this function instead of is_logged_in() function, must handle user
  * level messages.
  * @return boolean
  * @since 1.5.1
  */
 function sqauth_is_logged_in() {
-    if ( sqsession_is_registered('user_is_logged_in') ) {
+
+    global $check_referrer, $domain;
+    if (!sqgetGlobalVar('HTTP_REFERER', $referrer, SQ_SERVER)) $referrer = '';
+    if ($check_referrer == '###DOMAIN###') $check_referrer = $domain;
+    if (!empty($check_referrer)) {
+        $ssl_check_referrer = 'https://' . $check_referrer;
+        $plain_check_referrer = 'http://' . $check_referrer;
+    }
+    if (sqsession_is_registered('user_is_logged_in')
+     && (!$check_referrer || empty($referrer)
+      || ($check_referrer && !empty($referrer)
+       && (strpos(strtolower($referrer), strtolower($plain_check_referrer)) === 0
+        || strpos(strtolower($referrer), strtolower($ssl_check_referrer)) === 0)))) {
         return true;
     }
 
@@ -62,6 +93,9 @@ function sqauth_is_logged_in() {
  * @since 1.5.1
  */
 function sqauth_read_password() {
+    global $currentHookName;
+    if ($currentHookName == 'login_verified') global $key;
+
     sqgetGlobalVar('key',         $key,       SQ_COOKIE);
     sqgetGlobalVar('onetimepad',  $onetimepad,SQ_SESSION);
 
@@ -71,19 +105,26 @@ function sqauth_read_password() {
 /**
  * Saves or updates user password information
  *
- * This function is used to update password information that SquirrelMail
- * stores during existing web session. It does not modify password stored
- * in authentication system used by IMAP server.
+ * This function is used to update the password information that
+ * SquirrelMail stores in the existing PHP session. It does NOT 
+ * modify the password stored in the authentication system used
+ * by the IMAP server.
+ *
+ * This function must be called before any html output is started.
+ * Direct access to password information is deprecated. The saved
+ * password information is available only to the SquirrelMail script
+ * that is called/executed AFTER the current one. If your script
+ * needs access to the saved password after a sqauth_save_password()
+ * call, use the returned OTP encrypted key.
  *
- * Function must be called before any html output started. Direct access
- * to password information is deprecated. Saved password information is
- * available only to next executed SquirrelMail script. If your script needs
- * access to saved password after sqauth_save_password() call, use returned
- * OTP encrypted key.
  * @param string $pass password
- * @return string password encrypted with OTP. In case script wants to access
- *  password information before reloading page.
+ *
+ * @return string Password encrypted with OTP. In case the script
+ *                wants to access the password information before
+ *                the end of its execution.
+ *
  * @since 1.5.1
+ *
  */
 function sqauth_save_password($pass) {
     sqgetGlobalVar('base_uri',    $base_uri,   SQ_SESSION);
@@ -131,6 +172,7 @@ function cram_md5_response ($username,$password,$challenge) {
  */
 function digest_md5_response ($username,$password,$challenge,$service,$host,$authz='') {
     $result=digest_md5_parse_challenge($challenge);
+    //FIXME we should check that $result contains the expected values that we use below
 
     // verify server supports qop=auth
     // $qop = explode(",",$result['qop']);
@@ -192,7 +234,8 @@ function digest_md5_response ($username,$password,$challenge,$service,$host,$aut
  */
 function digest_md5_parse_challenge($challenge) {
     $challenge=base64_decode($challenge);
-    while (isset($challenge)) {
+    $parsed = array();
+    while (!empty($challenge)) {
         if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop
             $challenge=substr($challenge,1);
         }