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DigestMD5.php
<?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, $authzid); if ($challenge['realm']) { return sprintf('username="%s",realm="%s"' . $authzid_string . ',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']); } else { return sprintf('username="%s"' . $authzid_string . ',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $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'])) { $tokens['realm'] = ""; } // Maxbuf if (empty($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') && $fd = @fopen('/dev/urandom', 'r')) { return base64_encode(fread($fd, 32)); } elseif (@file_exists('/dev/random') && $fd = @fopen('/dev/random', 'r')) { return base64_encode(fread($fd, 32)); } else { $str = ''; for ($i=0; $i<32; $i++) { $str .= chr(mt_rand(0, 255)); } return base64_encode($str); } } } ?>
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