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1 | <?php |
2 | |
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3 | /** |
4 | * auth.php |
5 | * |
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6 | * Contains functions used to do authentication. |
7 | * |
8 | * Dependencies: |
9 | * functions/global.php |
10 | * functions/strings.php. |
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11 | * |
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12 | * @copyright © 1999-2007 The SquirrelMail Project Team |
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13 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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14 | * @version $Id$ |
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15 | * @package squirrelmail |
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16 | */ |
17 | |
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18 | |
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19 | /** |
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20 | * Detect whether user is logged in |
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21 | * |
22 | * Function is similar to is_logged_in() function. If user is logged in, function |
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23 | * returns true. If user is not logged in or session is expired, function saves $_POST |
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24 | * and PAGE_NAME in session and returns false. POST information is saved in |
25 | * 'session_expired_post' variable, PAGE_NAME is saved in 'session_expired_location'. |
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26 | * |
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27 | * Script that uses this function instead of is_logged_in() function, must handle user |
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28 | * level messages. |
29 | * @return boolean |
30 | * @since 1.5.1 |
31 | */ |
32 | function sqauth_is_logged_in() { |
33 | if ( sqsession_is_registered('user_is_logged_in') ) { |
34 | return true; |
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35 | } |
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36 | |
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37 | // First we store some information in the new session to prevent |
38 | // information-loss. |
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39 | $session_expired_post = $_POST; |
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40 | $session_expired_location = PAGE_NAME; |
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41 | if (!sqsession_is_registered('session_expired_post')) { |
42 | sqsession_register($session_expired_post,'session_expired_post'); |
43 | } |
44 | if (!sqsession_is_registered('session_expired_location')) { |
45 | sqsession_register($session_expired_location,'session_expired_location'); |
46 | } |
47 | session_write_close(); |
48 | |
49 | return false; |
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50 | } |
51 | |
52 | /** |
53 | * Reads and decodes stored user password information |
54 | * |
55 | * Direct access to password information is deprecated. |
56 | * @return string password in plain text |
57 | * @since 1.5.1 |
58 | */ |
59 | function sqauth_read_password() { |
60 | sqgetGlobalVar('key', $key, SQ_COOKIE); |
61 | sqgetGlobalVar('onetimepad', $onetimepad,SQ_SESSION); |
62 | |
63 | return OneTimePadDecrypt($key, $onetimepad); |
64 | } |
65 | |
66 | /** |
67 | * Saves or updates user password information |
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68 | * |
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69 | * This function is used to update password information that SquirrelMail |
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70 | * stores during existing web session. It does not modify password stored |
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71 | * in authentication system used by IMAP server. |
72 | * |
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73 | * Function must be called before any html output started. Direct access |
74 | * to password information is deprecated. Saved password information is |
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75 | * available only to next executed SquirrelMail script. If your script needs |
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76 | * access to saved password after sqauth_save_password() call, use returned |
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77 | * OTP encrypted key. |
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78 | * @param string $pass password |
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79 | * @return string password encrypted with OTP. In case script wants to access |
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80 | * password information before reloading page. |
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81 | * @since 1.5.1 |
82 | */ |
83 | function sqauth_save_password($pass) { |
84 | sqgetGlobalVar('base_uri', $base_uri, SQ_SESSION); |
85 | |
86 | $onetimepad = OneTimePadCreate(strlen($pass)); |
87 | sqsession_register($onetimepad,'onetimepad'); |
88 | $key = OneTimePadEncrypt($pass, $onetimepad); |
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89 | sqsetcookie('key', $key, false, $base_uri); |
90 | return $key; |
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91 | } |
92 | |
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93 | /** |
94 | * Given the challenge from the server, supply the response using cram-md5 (See |
95 | * RFC 2195 for details) |
96 | * |
97 | * @param string $username User ID |
98 | * @param string $password User password supplied by User |
99 | * @param string $challenge The challenge supplied by the server |
100 | * @return string The response to be sent to the IMAP server |
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101 | * @since 1.4.0 |
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102 | */ |
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103 | function cram_md5_response ($username,$password,$challenge) { |
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104 | $challenge=base64_decode($challenge); |
105 | $hash=bin2hex(hmac_md5($challenge,$password)); |
106 | $response=base64_encode($username . " " . $hash) . "\r\n"; |
107 | return $response; |
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108 | } |
109 | |
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110 | /** |
111 | * Return Digest-MD5 response. |
112 | * Given the challenge from the server, calculate and return the |
113 | * response-string for digest-md5 authentication. (See RFC 2831 for more |
114 | * details) |
115 | * |
116 | * @param string $username User ID |
117 | * @param string $password User password supplied by User |
118 | * @param string $challenge The challenge supplied by the server |
119 | * @param string $service The service name, usually 'imap'; it is used to |
120 | * define the digest-uri. |
121 | * @param string $host The host name, usually the server's FQDN; it is used to |
122 | * define the digest-uri. |
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123 | * @param string $authz Authorization ID (since 1.5.2) |
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124 | * @return string The response to be sent to the IMAP server |
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125 | * @since 1.4.0 |
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126 | */ |
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127 | function digest_md5_response ($username,$password,$challenge,$service,$host,$authz='') { |
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128 | $result=digest_md5_parse_challenge($challenge); |
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129 | |
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130 | // verify server supports qop=auth |
131 | // $qop = explode(",",$result['qop']); |
132 | //if (!in_array("auth",$qop)) { |
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133 | // rfc2831: client MUST fail if no qop methods supported |
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134 | // return false; |
135 | //} |
136 | $cnonce = base64_encode(bin2hex(hmac_md5(microtime()))); |
137 | $ncount = "00000001"; |
138 | |
139 | /* This can be auth (authentication only), auth-int (integrity protection), or |
140 | auth-conf (confidentiality protection). Right now only auth is supported. |
141 | DO NOT CHANGE THIS VALUE */ |
142 | $qop_value = "auth"; |
143 | |
144 | $digest_uri_value = $service . '/' . $host; |
145 | |
146 | // build the $response_value |
147 | //FIXME This will probably break badly if a server sends more than one realm |
148 | $string_a1 = utf8_encode($username).":"; |
149 | $string_a1 .= utf8_encode($result['realm']).":"; |
150 | $string_a1 .= utf8_encode($password); |
151 | $string_a1 = hmac_md5($string_a1); |
152 | $A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce; |
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153 | if(!empty($authz)) { |
154 | $A1 .= ":" . utf8_encode($authz); |
155 | } |
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156 | $A1 = bin2hex(hmac_md5($A1)); |
157 | $A2 = "AUTHENTICATE:$digest_uri_value"; |
158 | // If qop is auth-int or auth-conf, A2 gets a little extra |
159 | if ($qop_value != 'auth') { |
160 | $A2 .= ':00000000000000000000000000000000'; |
161 | } |
162 | $A2 = bin2hex(hmac_md5($A2)); |
163 | |
164 | $string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value; |
165 | $response_value = bin2hex(hmac_md5($A1.":".$string_response.":".$A2)); |
166 | |
167 | $reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",'; |
168 | $reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",'; |
169 | $reply .= "digest-uri=\"$digest_uri_value\",response=$response_value"; |
170 | $reply .= ',qop=' . $qop_value; |
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171 | if(!empty($authz)) { |
172 | $reply .= ',authzid=' . $authz; |
173 | } |
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174 | $reply = base64_encode($reply); |
175 | return $reply . "\r\n"; |
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176 | |
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177 | } |
178 | |
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179 | /** |
180 | * Parse Digest-MD5 challenge. |
181 | * This function parses the challenge sent during DIGEST-MD5 authentication and |
182 | * returns an array. See the RFC for details on what's in the challenge string. |
183 | * |
184 | * @param string $challenge Digest-MD5 Challenge |
185 | * @return array Digest-MD5 challenge decoded data |
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186 | * @since 1.4.0 |
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187 | */ |
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188 | function digest_md5_parse_challenge($challenge) { |
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189 | $challenge=base64_decode($challenge); |
190 | while (isset($challenge)) { |
191 | if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop |
192 | $challenge=substr($challenge,1); |
193 | } |
194 | $key=explode('=',$challenge,2); |
195 | $challenge=$key[1]; |
196 | $key=$key[0]; |
197 | if ($challenge{0} == '"') { |
198 | // We're in a quoted value |
199 | // Drop the first quote, since we don't care about it |
200 | $challenge=substr($challenge,1); |
201 | // Now explode() to the next quote, which is the end of our value |
202 | $val=explode('"',$challenge,2); |
203 | $challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop |
204 | $value=explode(',',$val[0]); |
205 | // Now, for those quoted values that are only 1 piece.. |
206 | if (sizeof($value) == 1) { |
207 | $value=$value[0]; // Convert to non-array |
208 | } |
209 | } else { |
210 | // We're in a "simple" value - explode to next comma |
211 | $val=explode(',',$challenge,2); |
212 | if (isset($val[1])) { |
213 | $challenge=$val[1]; |
214 | } else { |
215 | unset($challenge); |
216 | } |
217 | $value=$val[0]; |
218 | } |
219 | $parsed["$key"]=$value; |
220 | } // End of while loop |
221 | return $parsed; |
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222 | } |
223 | |
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224 | /** |
225 | * Creates a HMAC digest that can be used for auth purposes |
226 | * See RFCs 2104, 2617, 2831 |
227 | * Uses mhash() extension if available |
228 | * |
229 | * @param string $data Data to apply hash function to. |
230 | * @param string $key Optional key, which, if supplied, will be used to |
231 | * calculate data's HMAC. |
232 | * @return string HMAC Digest string |
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233 | * @since 1.4.0 |
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234 | */ |
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235 | function hmac_md5($data, $key='') { |
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236 | if (extension_loaded('mhash')) { |
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237 | if ($key== '') { |
238 | $mhash=mhash(MHASH_MD5,$data); |
239 | } else { |
240 | $mhash=mhash(MHASH_MD5,$data,$key); |
241 | } |
242 | return $mhash; |
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243 | } |
244 | if (!$key) { |
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245 | return pack('H*',md5($data)); |
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246 | } |
247 | $key = str_pad($key,64,chr(0x00)); |
248 | if (strlen($key) > 64) { |
249 | $key = pack("H*",md5($key)); |
250 | } |
251 | $k_ipad = $key ^ str_repeat(chr(0x36), 64) ; |
252 | $k_opad = $key ^ str_repeat(chr(0x5c), 64) ; |
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253 | /* Heh, let's get recursive. */ |
254 | $hmac=hmac_md5($k_opad . pack("H*",md5($k_ipad . $data)) ); |
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255 | return $hmac; |
256 | } |
257 | |
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258 | /** |
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259 | * Fillin user and password based on SMTP auth settings. |
260 | * |
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261 | * @param string $user Reference to SMTP username |
262 | * @param string $pass Reference to SMTP password (unencrypted) |
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263 | * @since 1.5.0 |
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264 | */ |
265 | function get_smtp_user(&$user, &$pass) { |
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266 | global $username, $smtp_auth_mech, |
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267 | $smtp_sitewide_user, $smtp_sitewide_pass; |
268 | |
269 | if ($smtp_auth_mech == 'none') { |
270 | $user = ''; |
271 | $pass = ''; |
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272 | } elseif ( isset($smtp_sitewide_user) && isset($smtp_sitewide_pass) && |
273 | !empty($smtp_sitewide_user)) { |
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274 | $user = $smtp_sitewide_user; |
275 | $pass = $smtp_sitewide_pass; |
276 | } else { |
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277 | $user = $username; |
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278 | $pass = sqauth_read_password(); |
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279 | } |
280 | } |