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198 lines
8.3 KiB
PHP
198 lines
8.3 KiB
PHP
<?php
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// +-----------------------------------------------------------------------+
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// | Copyright (c) 2002-2003 Richard Heyes |
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// | All rights reserved. |
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// | |
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// | Redistribution and use in source and binary forms, with or without |
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// | modification, are permitted provided that the following conditions |
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// | are met: |
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// | |
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// | o Redistributions of source code must retain the above copyright |
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// | notice, this list of conditions and the following disclaimer. |
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// | o Redistributions in binary form must reproduce the above copyright |
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// | notice, this list of conditions and the following disclaimer in the |
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// | documentation and/or other materials provided with the distribution.|
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// | o The names of the authors may not be used to endorse or promote |
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// | products derived from this software without specific prior written |
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// | permission. |
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// | |
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// | |
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// +-----------------------------------------------------------------------+
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// | Author: Richard Heyes <richard@php.net> |
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// +-----------------------------------------------------------------------+
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//
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// $Id$
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/**
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* Implmentation of DIGEST-MD5 SASL mechanism
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*
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* @author Richard Heyes <richard@php.net>
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* @access public
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* @version 1.0
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* @package Auth_SASL
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*/
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require_once('Auth/SASL/Common.php');
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class Auth_SASL_DigestMD5 extends Auth_SASL_Common
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{
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/**
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* Provides the (main) client response for DIGEST-MD5
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* requires a few extra parameters than the other
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* mechanisms, which are unavoidable.
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*
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* @param string $authcid Authentication id (username)
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* @param string $pass Password
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* @param string $challenge The digest challenge sent by the server
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* @param string $hostname The hostname of the machine you're connecting to
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* @param string $service The servicename (eg. imap, pop, acap etc)
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* @param string $authzid Authorization id (username to proxy as)
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* @return string The digest response (NOT base64 encoded)
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* @access public
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*/
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function getResponse($authcid, $pass, $challenge, $hostname, $service, $authzid = '')
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{
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$challenge = $this->_parseChallenge($challenge);
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$authzid_string = '';
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if ($authzid != '') {
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$authzid_string = ',authzid="' . $authzid . '"';
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}
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if (!empty($challenge)) {
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$cnonce = $this->_getCnonce();
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$digest_uri = sprintf('%s/%s', $service, $hostname);
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$response_value = $this->_getResponseValue($authcid, $pass, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $authzid);
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if ($challenge['realm']) {
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return sprintf('username="%s",realm="%s"' . $authzid_string .
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',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']);
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} else {
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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']);
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}
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} else {
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return PEAR::raiseError('Invalid digest challenge');
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}
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}
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/**
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* Parses and verifies the digest challenge*
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*
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* @param string $challenge The digest challenge
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* @return array The parsed challenge as an assoc
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* array in the form "directive => value".
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* @access private
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*/
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function _parseChallenge($challenge)
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{
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$tokens = array();
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while (preg_match('/^([a-z-]+)=("[^"]+(?<!\\\)"|[^,]+)/i', $challenge, $matches)) {
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// Ignore these as per rfc2831
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if ($matches[1] == 'opaque' OR $matches[1] == 'domain') {
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$challenge = substr($challenge, strlen($matches[0]) + 1);
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continue;
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}
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// Allowed multiple "realm" and "auth-param"
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if (!empty($tokens[$matches[1]]) AND ($matches[1] == 'realm' OR $matches[1] == 'auth-param')) {
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if (is_array($tokens[$matches[1]])) {
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$tokens[$matches[1]][] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
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} else {
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$tokens[$matches[1]] = array($tokens[$matches[1]], preg_replace('/^"(.*)"$/', '\\1', $matches[2]));
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}
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// Any other multiple instance = failure
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} elseif (!empty($tokens[$matches[1]])) {
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$tokens = array();
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break;
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} else {
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$tokens[$matches[1]] = preg_replace('/^"(.*)"$/', '\\1', $matches[2]);
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}
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// Remove the just parsed directive from the challenge
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$challenge = substr($challenge, strlen($matches[0]) + 1);
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}
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/**
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* Defaults and required directives
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*/
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// Realm
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if (empty($tokens['realm'])) {
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$tokens['realm'] = "";
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}
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// Maxbuf
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if (empty($tokens['maxbuf'])) {
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$tokens['maxbuf'] = 65536;
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}
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// Required: nonce, algorithm
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if (empty($tokens['nonce']) OR empty($tokens['algorithm'])) {
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return array();
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}
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return $tokens;
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}
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/**
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* Creates the response= part of the digest response
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*
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* @param string $authcid Authentication id (username)
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* @param string $pass Password
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* @param string $realm Realm as provided by the server
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* @param string $nonce Nonce as provided by the server
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* @param string $cnonce Client nonce
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* @param string $digest_uri The digest-uri= value part of the response
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* @param string $authzid Authorization id
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* @return string The response= part of the digest response
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* @access private
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*/
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function _getResponseValue($authcid, $pass, $realm, $nonce, $cnonce, $digest_uri, $authzid = '')
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{
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if ($authzid == '') {
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$A1 = sprintf('%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce);
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} else {
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$A1 = sprintf('%s:%s:%s:%s', pack('H32', md5(sprintf('%s:%s:%s', $authcid, $realm, $pass))), $nonce, $cnonce, $authzid);
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}
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$A2 = 'AUTHENTICATE:' . $digest_uri;
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return md5(sprintf('%s:%s:00000001:%s:auth:%s', md5($A1), $nonce, $cnonce, md5($A2)));
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}
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/**
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* Creates the client nonce for the response
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*
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* @return string The cnonce value
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* @access private
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*/
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function _getCnonce()
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{
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if (file_exists('/dev/urandom') && $fd = @fopen('/dev/urandom', 'r')) {
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return base64_encode(fread($fd, 32));
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} elseif (file_exists('/dev/random') && $fd = @fopen('/dev/random', 'r')) {
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return base64_encode(fread($fd, 32));
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} else {
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$str = '';
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for ($i=0; $i<32; $i++) {
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$str .= chr(mt_rand(0, 255));
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}
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return base64_encode($str);
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}
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}
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}
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?>
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