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1 | <?php |
2 | |
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3 | /** |
4 | * auth.php |
5 | * |
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6 | * Copyright (c) 1999-2003 The SquirrelMail Project Team |
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7 | * Licensed under the GNU GPL. For full terms see the file COPYING. |
8 | * |
9 | * Contains functions used to do authentication. |
10 | * |
11 | * $Id$ |
12 | */ |
13 | |
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14 | /* Put in a safety net here, in case a naughty admin didn't run conf.pl when they upgraded */ |
15 | |
16 | if (! isset($smtp_auth_mech)) { |
17 | $smtp_auth_mech = 'none'; |
18 | } |
19 | |
20 | if (! isset($imap_auth_mech)) { |
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21 | $imap_auth_mech = 'login'; |
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22 | } |
23 | |
24 | if (! isset($use_imap_tls)) { |
25 | $use_imap_tls = false; |
26 | } |
27 | |
28 | if (! isset($use_smtp_tls)) { |
29 | $use_smtp_tls = false; |
30 | } |
31 | |
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32 | function is_logged_in() { |
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33 | |
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34 | if ( sqsession_is_registered('user_is_logged_in') ) { |
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35 | return; |
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36 | } else { |
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37 | global $PHP_SELF, $session_expired_post, |
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38 | $session_expired_location; |
39 | |
40 | /* First we store some information in the new session to prevent |
41 | * information-loss. |
42 | */ |
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43 | |
44 | $session_expired_post = $_POST; |
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45 | $session_expired_location = $PHP_SELF; |
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46 | if (!sqsession_is_registered('session_expired_post')) { |
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47 | sqsession_register($session_expired_post,'session_expired_post'); |
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48 | } |
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49 | if (!sqsession_is_registered('session_expired_location')) { |
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50 | sqsession_register($session_expired_location,'session_expired_location'); |
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51 | } |
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52 | include_once( SM_PATH . 'functions/display_messages.php' ); |
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53 | logout_error( _("You must be logged in to access this page.") ); |
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54 | exit; |
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55 | } |
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56 | } |
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57 | |
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58 | function cram_md5_response ($username,$password,$challenge) { |
59 | |
60 | /* Given the challenge from the server, supply the response using |
61 | cram-md5 (See RFC 2195 for details) |
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62 | */ |
63 | $challenge=base64_decode($challenge); |
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64 | $hash=bin2hex(hmac_md5($challenge,$password)); |
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65 | $response=base64_encode($username . " " . $hash) . "\r\n"; |
66 | return $response; |
67 | } |
68 | |
69 | function digest_md5_response ($username,$password,$challenge,$service,$host) { |
70 | /* Given the challenge from the server, calculate and return the response-string |
71 | for digest-md5 authentication. (See RFC 2831 for more details) */ |
72 | $result=digest_md5_parse_challenge($challenge); |
73 | |
74 | // verify server supports qop=auth |
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75 | // $qop = explode(",",$result['qop']); |
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76 | //if (!in_array("auth",$qop)) { |
77 | // rfc2831: client MUST fail if no qop methods supported |
78 | // return false; |
79 | //} |
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80 | $cnonce = base64_encode(bin2hex(hmac_md5(microtime()))); |
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81 | $ncount = "00000001"; |
82 | |
83 | /* This can be auth (authentication only), auth-int (integrity protection), or |
84 | auth-conf (confidentiality protection). Right now only auth is supported. |
85 | DO NOT CHANGE THIS VALUE */ |
86 | $qop_value = "auth"; |
87 | |
88 | $digest_uri_value = $service . '/' . $host; |
89 | |
90 | // build the $response_value |
91 | //FIXME This will probably break badly if a server sends more than one realm |
92 | $string_a1 = utf8_encode($username).":"; |
93 | $string_a1 .= utf8_encode($result['realm']).":"; |
94 | $string_a1 .= utf8_encode($password); |
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95 | $string_a1 = hmac_md5($string_a1); |
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96 | $A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce; |
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97 | $A1 = bin2hex(hmac_md5($A1)); |
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98 | $A2 = "AUTHENTICATE:$digest_uri_value"; |
99 | // If qop is auth-int or auth-conf, A2 gets a little extra |
100 | if ($qop_value != 'auth') { |
101 | $A2 .= ':00000000000000000000000000000000'; |
102 | } |
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103 | $A2 = bin2hex(hmac_md5($A2)); |
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104 | |
105 | $string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value; |
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106 | $response_value = bin2hex(hmac_md5($A1.":".$string_response.":".$A2)); |
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107 | |
108 | $reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",'; |
109 | $reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",'; |
110 | $reply .= "digest-uri=\"$digest_uri_value\",response=$response_value"; |
111 | $reply .= ',qop=' . $qop_value; |
112 | $reply = base64_encode($reply); |
113 | return $reply . "\r\n"; |
114 | |
115 | } |
116 | |
117 | function digest_md5_parse_challenge($challenge) { |
118 | /* This function parses the challenge sent during DIGEST-MD5 authentication and |
119 | returns an array. See the RFC for details on what's in the challenge string. |
120 | */ |
121 | $challenge=base64_decode($challenge); |
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122 | while (isset($challenge)) { |
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123 | if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop |
124 | $challenge=substr($challenge,1); |
125 | } |
126 | $key=explode('=',$challenge,2); |
127 | $challenge=$key[1]; |
128 | $key=$key[0]; |
129 | if ($challenge{0} == '"') { |
130 | // We're in a quoted value |
131 | // Drop the first quote, since we don't care about it |
132 | $challenge=substr($challenge,1); |
133 | // Now explode() to the next quote, which is the end of our value |
134 | $val=explode('"',$challenge,2); |
135 | $challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop |
136 | $value=explode(',',$val[0]); |
137 | // Now, for those quoted values that are only 1 piece.. |
138 | if (sizeof($value) == 1) { |
139 | $value=$value[0]; // Convert to non-array |
140 | } |
141 | } else { |
142 | // We're in a "simple" value - explode to next comma |
143 | $val=explode(',',$challenge,2); |
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144 | if (isset($val[1])) { |
145 | $challenge=$val[1]; |
146 | } else { |
147 | unset($challenge); |
148 | } |
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149 | $value=$val[0]; |
150 | } |
151 | $parsed["$key"]=$value; |
152 | } // End of while loop |
153 | return $parsed; |
154 | } |
155 | |
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156 | function hmac_md5($data, $key='') { |
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157 | // Creates a HMAC digest that can be used for auth purposes |
158 | // See RFCs 2104, 2617, 2831 |
159 | // Uses mhash() extension if available |
160 | if (extension_loaded('mhash')) { |
161 | if ($key== '') { |
162 | $mhash=mhash(MHASH_MD5,$data); |
163 | } else { |
164 | $mhash=mhash(MHASH_MD5,$data,$key); |
165 | } |
166 | return $mhash; |
167 | } |
168 | if (!$key) { |
169 | return pack('H*',md5($data)); |
170 | } |
171 | $key = str_pad($key,64,chr(0x00)); |
172 | if (strlen($key) > 64) { |
173 | $key = pack("H*",md5($key)); |
174 | } |
175 | $k_ipad = $key ^ str_repeat(chr(0x36), 64) ; |
176 | $k_opad = $key ^ str_repeat(chr(0x5c), 64) ; |
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177 | /* Heh, let's get recursive. */ |
178 | $hmac=hmac_md5($k_opad . pack("H*",md5($k_ipad . $data)) ); |
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179 | return $hmac; |
180 | } |
181 | |
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182 | ?> |