From 627330f670ad7921044592ca72819f7ee6ed3fa0 Mon Sep 17 00:00:00 2001
From: thomascube <thomas@roundcube.net>
Date: Mon, 3 Oct 2005 20:25:31 +0000
Subject: Minor bugfixes and SMTP support

---
 program/lib/Auth/SASL/DigestMD5.php | 194 ++++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100755 program/lib/Auth/SASL/DigestMD5.php

(limited to 'program/lib/Auth/SASL/DigestMD5.php')

diff --git a/program/lib/Auth/SASL/DigestMD5.php b/program/lib/Auth/SASL/DigestMD5.php
new file mode 100755
index 000000000..dcd9910fe
--- /dev/null
+++ b/program/lib/Auth/SASL/DigestMD5.php
@@ -0,0 +1,194 @@
+<?php
+// +-----------------------------------------------------------------------+ 
+// | Copyright (c) 2002-2003 Richard Heyes                                 | 
+// | All rights reserved.                                                  | 
+// |                                                                       | 
+// | Redistribution and use in source and binary forms, with or without    | 
+// | modification, are permitted provided that the following conditions    | 
+// | are met:                                                              | 
+// |                                                                       | 
+// | o Redistributions of source code must retain the above copyright      | 
+// |   notice, this list of conditions and the following disclaimer.       | 
+// | o 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.| 
+// | o The names of the authors may not be used to endorse or promote      | 
+// |   products derived from this software without specific prior written  | 
+// |   permission.                                                         | 
+// |                                                                       | 
+// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   | 
+// | "AS IS" AND ANY EXPRESS 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 COPYRIGHT  | 
+// | OWNER OR 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.  | 
+// |                                                                       | 
+// +-----------------------------------------------------------------------+ 
+// | Author: Richard Heyes <richard@php.net>                               | 
+// +-----------------------------------------------------------------------+ 
+// 
+// $Id$
+
+/**
+* Implmentation of DIGEST-MD5 SASL mechanism
+*
+* @author  Richard Heyes <richard@php.net>
+* @access  public
+* @version 1.0
+* @package Auth_SASL
+*/
+
+require_once('Auth/SASL/Common.php');
+
+class Auth_SASL_DigestMD5 extends Auth_SASL_Common
+{
+    /**
+    * Provides the (main) client response for DIGEST-MD5
+    * requires a few extra parameters than the other
+    * mechanisms, which are unavoidable.
+    * 
+    * @param  string $authcid   Authentication id (username)
+    * @param  string $pass      Password
+    * @param  string $challenge The digest challenge sent by the server
+    * @param  string $hostname  The hostname of the machine you're connecting to
+    * @param  string $service   The servicename (eg. imap, pop, acap etc)
+    * @param  string $authzid   Authorization id (username to proxy as)
+    * @return string            The digest response (NOT base64 encoded)
+    * @access public
+    */
+    function getResponse($authcid, $pass, $challenge, $hostname, $service, $authzid = '')
+    {
+        $challenge = $this->_parseChallenge($challenge);
+        $authzid_string = '';
+        if ($authzid != '') {
+            $authzid_string = ',authzid="' . $authzid . '"'; 
+        }
+
+        if (!empty($challenge)) {
+            $cnonce         = $this->_getCnonce();
+            $digest_uri     = sprintf('%s/%s', $service, $hostname);
+            $response_value = $this->_getResponseValue($authcid, $pass, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $authzid);
+
+            return sprintf('username="%s",realm="%s"' . $authzid_string  . ',nonce="%s",cnonce="%s",nc="00000001",qop=auth,digest-uri="%s",response=%s,%d', $authcid, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']);
+        } else {
+            return PEAR::raiseError('Invalid digest challenge');
+        }
+    }
+    
+    /**
+    * Parses and verifies the digest challenge*
+    *
+    * @param  string $challenge The digest challenge
+    * @return array             The parsed challenge as an assoc
+    *                           array in the form "directive => value".
+    * @access private
+    */
+    function _parseChallenge($challenge)
+    {
+        $tokens = array();
+        while (preg_match('/^([a-z-]+)=("[^"]+(?<!\\\)"|[^,]+)/i', $challenge, $matches)) {
+
+            // Ignore these as per rfc2831
+            if ($matches[1] == 'opaque' OR $matches[1] == 'domain') {
+                $challenge = substr($challenge, strlen($matches[0]) + 1);
+                continue;
+            }
+
+            // Allowed multiple "realm" and "auth-param"
+            if (!empty($tokens[$matches[1]]) AND ($matches[1] == 'realm' OR $matches[1] == 'auth-param')) {
+                if (is_array($tokens[$matches[1]])) {
+                    $tokens[$matches[1]][] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
+                } else {
+                    $tokens[$matches[1]] = array($tokens[$matches[1]], preg_replace('/^"(.*)"$/', '\\1', $matches[2]));
+                }
+
+            // Any other multiple instance = failure
+            } elseif (!empty($tokens[$matches[1]])) {
+                $tokens = array();
+                break;
+
+            } else {
+                $tokens[$matches[1]] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
+            }
+
+            // Remove the just parsed directive from the challenge
+            $challenge = substr($challenge, strlen($matches[0]) + 1);
+        }
+
+        /**
+        * Defaults and required directives
+        */
+        // Realm
+        if (empty($tokens['realm'])) {
+            $uname = posix_uname();
+            $tokens['realm'] = $uname['nodename'];
+        }
+        
+        // Maxbuf
+        if (empty($tokens['maxbuf'])) {
+            $tokens['maxbuf'] = 65536;
+        }
+        
+        // Required: nonce, algorithm
+        if (empty($tokens['nonce']) OR empty($tokens['algorithm'])) {
+            return array();
+        }
+        
+        return $tokens;
+    }
+
+    /**
+    * Creates the response= part of the digest response
+    *
+    * @param  string $authcid    Authentication id (username)
+    * @param  string $pass       Password
+    * @param  string $realm      Realm as provided by the server
+    * @param  string $nonce      Nonce as provided by the server
+    * @param  string $cnonce     Client nonce
+    * @param  string $digest_uri The digest-uri= value part of the response
+    * @param  string $authzid    Authorization id
+    * @return string             The response= part of the digest response
+    * @access private
+    */    
+    function _getResponseValue($authcid, $pass, $realm, $nonce, $cnonce, $digest_uri, $authzid = '')
+    {
+        if ($authzid == '') {
+            $A1 = sprintf('%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce);
+        } else {
+            $A1 = sprintf('%s:%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce, $authzid);
+        }
+        $A2 = 'AUTHENTICATE:' . $digest_uri;
+        return md5(sprintf('%s:%s:00000001:%s:auth:%s', md5($A1), $nonce, $cnonce, md5($A2)));
+    }
+
+    /**
+    * Creates the client nonce for the response
+    *
+    * @return string  The cnonce value
+    * @access private
+    */
+    function _getCnonce()
+    {
+        if (file_exists('/dev/urandom')) {
+            return base64_encode(fread(fopen('/dev/urandom', 'r'), 32));
+
+        } elseif (file_exists('/dev/random')) {
+            return base64_encode(fread(fopen('/dev/random', 'r'), 32));
+
+        } else {
+            $str = '';
+            mt_srand((double)microtime()*10000000);
+            for ($i=0; $i<32; $i++) {
+                $str .= chr(mt_rand(0, 255));
+            }
+            
+            return base64_encode($str);
+        }
+    }
+}
+?>
-- 
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