--- /dev/null
+<?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: DigestMD5.php 294702 2010-02-07 16:03:55Z cweiske $
+
+/**
+* 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);
+ }
+ }
+}
+?>
projects / quix0rs-gnu-social.git / blobdiff