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* Copyright (c) 1999-2003 The SquirrelMail Project Team
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* Licensed under the GNU GPL. For full terms see the file COPYING.
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* Contains functions used to do authentication.
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* $Id: auth.php,v 1.37 2004/01/04 06:11:15 ebullient Exp $
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* @package squirrelmail
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/** Put in a safety net here, in case a naughty admin didn't run conf.pl when they upgraded */
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if (! isset($smtp_auth_mech)) {
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$smtp_auth_mech = 'none';
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if (! isset($imap_auth_mech)) {
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$imap_auth_mech = 'login';
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if (! isset($use_imap_tls)) {
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$use_imap_tls = false;
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if (! isset($use_smtp_tls)) {
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$use_smtp_tls = false;
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* Check if user has previously logged in to the Squirrelmail session. If user
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* has not logged in, execution will stop inside this function.
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* @return int A positive value is returned if user has previously logged in
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function is_logged_in() {
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if ( sqsession_is_registered('user_is_logged_in') ) {
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global $PHP_SELF, $session_expired_post,
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$session_expired_location;
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/* First we store some information in the new session to prevent
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$session_expired_post = $_POST;
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$session_expired_location = $PHP_SELF;
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if (!sqsession_is_registered('session_expired_post')) {
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sqsession_register($session_expired_post,'session_expired_post');
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if (!sqsession_is_registered('session_expired_location')) {
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sqsession_register($session_expired_location,'session_expired_location');
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include_once( SM_PATH . 'functions/display_messages.php' );
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logout_error( _("You must be logged in to access this page.") );
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* Given the challenge from the server, supply the response using cram-md5 (See
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* RFC 2195 for details)
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* @param string $username User ID
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* @param string $password User password supplied by User
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* @param string $challenge The challenge supplied by the server
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* @return string The response to be sent to the IMAP server
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function cram_md5_response ($username,$password,$challenge) {
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$challenge=base64_decode($challenge);
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$hash=bin2hex(hmac_md5($challenge,$password));
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$response=base64_encode($username . " " . $hash) . "\r\n";
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* Return Digest-MD5 response.
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* Given the challenge from the server, calculate and return the
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* response-string for digest-md5 authentication. (See RFC 2831 for more
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* @param string $username User ID
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* @param string $password User password supplied by User
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* @param string $challenge The challenge supplied by the server
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* @param string $service The service name, usually 'imap'; it is used to
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* define the digest-uri.
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* @param string $host The host name, usually the server's FQDN; it is used to
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* define the digest-uri.
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* @return string The response to be sent to the IMAP server
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function digest_md5_response ($username,$password,$challenge,$service,$host) {
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$result=digest_md5_parse_challenge($challenge);
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// verify server supports qop=auth
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// $qop = explode(",",$result['qop']);
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//if (!in_array("auth",$qop)) {
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// rfc2831: client MUST fail if no qop methods supported
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$cnonce = base64_encode(bin2hex(hmac_md5(microtime())));
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$ncount = "00000001";
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/* This can be auth (authentication only), auth-int (integrity protection), or
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auth-conf (confidentiality protection). Right now only auth is supported.
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DO NOT CHANGE THIS VALUE */
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$digest_uri_value = $service . '/' . $host;
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// build the $response_value
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//FIXME This will probably break badly if a server sends more than one realm
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$string_a1 = utf8_encode($username).":";
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$string_a1 .= utf8_encode($result['realm']).":";
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$string_a1 .= utf8_encode($password);
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$string_a1 = hmac_md5($string_a1);
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$A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce;
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$A1 = bin2hex(hmac_md5($A1));
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$A2 = "AUTHENTICATE:$digest_uri_value";
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// If qop is auth-int or auth-conf, A2 gets a little extra
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if ($qop_value != 'auth') {
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$A2 .= ':00000000000000000000000000000000';
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$A2 = bin2hex(hmac_md5($A2));
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$string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value;
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$response_value = bin2hex(hmac_md5($A1.":".$string_response.":".$A2));
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$reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",';
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$reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",';
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$reply .= "digest-uri=\"$digest_uri_value\",response=$response_value";
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$reply .= ',qop=' . $qop_value;
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$reply = base64_encode($reply);
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return $reply . "\r\n";
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* Parse Digest-MD5 challenge.
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* This function parses the challenge sent during DIGEST-MD5 authentication and
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* returns an array. See the RFC for details on what's in the challenge string.
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* @param string $challenge Digest-MD5 Challenge
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* @return array Digest-MD5 challenge decoded data
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function digest_md5_parse_challenge($challenge) {
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$challenge=base64_decode($challenge);
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while (isset($challenge)) {
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if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop
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$challenge=substr($challenge,1);
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$key=explode('=',$challenge,2);
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if ($challenge{0} == '"') {
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// We're in a quoted value
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// Drop the first quote, since we don't care about it
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$challenge=substr($challenge,1);
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// Now explode() to the next quote, which is the end of our value
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$val=explode('"',$challenge,2);
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$challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop
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$value=explode(',',$val[0]);
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// Now, for those quoted values that are only 1 piece..
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if (sizeof($value) == 1) {
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$value=$value[0]; // Convert to non-array
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// We're in a "simple" value - explode to next comma
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$val=explode(',',$challenge,2);
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if (isset($val[1])) {
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$parsed["$key"]=$value;
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} // End of while loop
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* Creates a HMAC digest that can be used for auth purposes
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* See RFCs 2104, 2617, 2831
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* Uses mhash() extension if available
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* @param string $data Data to apply hash function to.
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* @param string $key Optional key, which, if supplied, will be used to
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* calculate data's HMAC.
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* @return string HMAC Digest string
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function hmac_md5($data, $key='') {
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if (extension_loaded('mhash')) {
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$mhash=mhash(MHASH_MD5,$data);
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$mhash=mhash(MHASH_MD5,$data,$key);
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return pack('H*',md5($data));
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$key = str_pad($key,64,chr(0x00));
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if (strlen($key) > 64) {
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$key = pack("H*",md5($key));
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$k_ipad = $key ^ str_repeat(chr(0x36), 64) ;
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$k_opad = $key ^ str_repeat(chr(0x5c), 64) ;
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/* Heh, let's get recursive. */
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$hmac=hmac_md5($k_opad . pack("H*",md5($k_ipad . $data)) );
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* Fillin user and password based on SMTP auth settings.
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* @param string $user Reference to SMTP username
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* @param string $pass Reference to SMTP password (unencrypted)
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function get_smtp_user(&$user, &$pass) {
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global $username, $smtp_auth_mech,
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$smtp_sitewide_user, $smtp_sitewide_pass;
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if ($smtp_auth_mech == 'none') {
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} elseif ( isset($smtp_sitewide_user) && isset($smtp_sitewide_pass) ) {
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$user = $smtp_sitewide_user;
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$pass = $smtp_sitewide_pass;
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global $key, $onetimepad;
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$pass = OneTimePadDecrypt($key, $onetimepad);
added
removed
functions/auth.php
