6 * Copyright (c) 1999-2002 The SquirrelMail Project Team
7 * Licensed under the GNU GPL. For full terms see the file COPYING.
9 * Contains functions used to do authentication.
14 /* Put in a safety net here, in case a naughty admin didn't run conf.pl when they upgraded */
16 if (! isset($smtp_auth_mech)) {
17 $smtp_auth_mech = 'none';
20 if (! isset($imap_auth_mech)) {
21 $imap_auth_mech = 'plain';
24 if (! isset($use_imap_tls)) {
25 $use_imap_tls = false;
28 if (! isset($use_smtp_tls)) {
29 $use_smtp_tls = false;
32 function is_logged_in() {
34 if ( sqsession_is_registered('user_is_logged_in') ) {
37 global $PHP_SELF, $session_expired_post,
38 $session_expired_location;
40 /* First we store some information in the new session to prevent
44 $session_expired_post = $_POST;
45 $session_expired_location = $PHP_SELF;
46 if (!sqsession_is_registered('session_expired_post')) {
47 sqsession_register($session_expired_post,'session_expired_post');
49 if (!sqsession_is_registered('session_expired_location')) {
50 sqsession_register($session_expired_location,'session_expired_location');
52 include_once( '../functions/display_messages.php' );
53 logout_error( _("You must be logged in to access this page.") );
58 function cram_md5_response ($username,$password,$challenge) {
60 /* Given the challenge from the server, supply the response using
61 cram-md5 (See RFC 2195 for details)
62 NOTE: Requires mhash extension to PHP
64 $challenge=base64_decode($challenge);
65 $hash=bin2hex(mhash(MHASH_MD5
,$challenge,$password));
66 $response=base64_encode($username . " " . $hash) . "\r\n";
70 function digest_md5_response ($username,$password,$challenge,$service,$host) {
71 /* Given the challenge from the server, calculate and return the response-string
72 for digest-md5 authentication. (See RFC 2831 for more details) */
73 $result=digest_md5_parse_challenge($challenge);
75 // verify server supports qop=auth
76 // $qop = explode(",",$result['qop']);
77 //if (!in_array("auth",$qop)) {
78 // rfc2831: client MUST fail if no qop methods supported
81 $cnonce = base64_encode(bin2hex(mhash(MHASH_MD5
, microtime())));
84 /* This can be auth (authentication only), auth-int (integrity protection), or
85 auth-conf (confidentiality protection). Right now only auth is supported.
86 DO NOT CHANGE THIS VALUE */
89 $digest_uri_value = $service . '/' . $host;
91 // build the $response_value
92 //FIXME This will probably break badly if a server sends more than one realm
93 $string_a1 = utf8_encode($username).":";
94 $string_a1 .= utf8_encode($result['realm']).":";
95 $string_a1 .= utf8_encode($password);
96 $string_a1 = mhash(MHASH_MD5
, $string_a1);
97 $A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce;
98 $A1 = bin2hex(mhash(MHASH_MD5
, $A1));
99 $A2 = "AUTHENTICATE:$digest_uri_value";
100 // If qop is auth-int or auth-conf, A2 gets a little extra
101 if ($qop_value != 'auth') {
102 $A2 .= ':00000000000000000000000000000000';
104 $A2 = bin2hex(mhash(MHASH_MD5
, $A2));
106 $string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value;
107 $response_value = bin2hex(mhash(MHASH_MD5
, $A1.":".$string_response.":".$A2));
109 $reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",';
110 $reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",';
111 $reply .= "digest-uri=\"$digest_uri_value\",response=$response_value";
112 $reply .= ',qop=' . $qop_value;
113 $reply = base64_encode($reply);
114 return $reply . "\r\n";
118 function digest_md5_parse_challenge($challenge) {
119 /* This function parses the challenge sent during DIGEST-MD5 authentication and
120 returns an array. See the RFC for details on what's in the challenge string.
122 $challenge=base64_decode($challenge);
123 while (isset($challenge)) {
124 if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop
125 $challenge=substr($challenge,1);
127 $key=explode('=',$challenge,2);
130 if ($challenge{0} == '"') {
131 // We're in a quoted value
132 // Drop the first quote, since we don't care about it
133 $challenge=substr($challenge,1);
134 // Now explode() to the next quote, which is the end of our value
135 $val=explode('"',$challenge,2);
136 $challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop
137 $value=explode(',',$val[0]);
138 // Now, for those quoted values that are only 1 piece..
139 if (sizeof($value) == 1) {
140 $value=$value[0]; // Convert to non-array
143 // We're in a "simple" value - explode to next comma
144 $val=explode(',',$challenge,2);
145 if (isset($val[1])) {
152 $parsed["$key"]=$value;
153 } // End of while loop