X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=functions%2Fauth.php;h=85eb8ff3bdf8299948d77e062a5552684d126615;hb=3e28c1231fe4d9a49563b39c1647d26d7723bd96;hp=bebc7f87a1739de545b3c994428b94118c809ccb;hpb=2fa4a9b78e0bea6d75e20ea113aaa96ee2894f1a;p=squirrelmail.git diff --git a/functions/auth.php b/functions/auth.php index bebc7f87..85eb8ff3 100644 --- a/functions/auth.php +++ b/functions/auth.php @@ -3,7 +3,7 @@ /** * auth.php * - * Copyright (c) 1999-2002 The SquirrelMail Project Team + * Copyright (c) 1999-2003 The SquirrelMail Project Team * Licensed under the GNU GPL. For full terms see the file COPYING. * * Contains functions used to do authentication. @@ -11,29 +11,172 @@ * $Id$ */ -require_once( '../functions/page_header.php' ); +/* Put in a safety net here, in case a naughty admin didn't run conf.pl when they upgraded */ -function is_logged_in () { - global $squirrelmail_language, $frame_top, $base_uri; +if (! isset($smtp_auth_mech)) { + $smtp_auth_mech = 'none'; +} + +if (! isset($imap_auth_mech)) { + $imap_auth_mech = 'login'; +} + +if (! isset($use_imap_tls)) { + $use_imap_tls = false; +} + +if (! isset($use_smtp_tls)) { + $use_smtp_tls = false; +} - if ( session_is_registered('user_is_logged_in') ) { +function is_logged_in() { + + if ( sqsession_is_registered('user_is_logged_in') ) { return; - } + } else { + global $PHP_SELF, $session_expired_post, + $session_expired_location; - if (!isset($frame_top) || $frame_top == '' ) { - $frame_top = '_top'; + /* First we store some information in the new session to prevent + * information-loss. + */ + + $session_expired_post = $_POST; + $session_expired_location = $PHP_SELF; + if (!sqsession_is_registered('session_expired_post')) { + sqsession_register($session_expired_post,'session_expired_post'); + } + if (!sqsession_is_registered('session_expired_location')) { + sqsession_register($session_expired_location,'session_expired_location'); + } + include_once( SM_PATH . 'functions/display_messages.php' ); + logout_error( _("You must be logged in to access this page.") ); + exit; } +} + +function cram_md5_response ($username,$password,$challenge) { + +/* Given the challenge from the server, supply the response using + cram-md5 (See RFC 2195 for details) +*/ +$challenge=base64_decode($challenge); +$hash=bin2hex(hmac_md5($challenge,$password)); +$response=base64_encode($username . " " . $hash) . "\r\n"; +return $response; +} - set_up_language($squirrelmail_language, true); +function digest_md5_response ($username,$password,$challenge,$service,$host) { +/* Given the challenge from the server, calculate and return the response-string + for digest-md5 authentication. (See RFC 2831 for more details) */ + $result=digest_md5_parse_challenge($challenge); + +// verify server supports qop=auth + // $qop = explode(",",$result['qop']); + //if (!in_array("auth",$qop)) { + // rfc2831: client MUST fail if no qop methods supported + // return false; + //} + $cnonce = base64_encode(bin2hex(hmac_md5(microtime()))); + $ncount = "00000001"; - displayHtmlHeader( 'SquirrelMail', '', FALSE ); + /* This can be auth (authentication only), auth-int (integrity protection), or + auth-conf (confidentiality protection). Right now only auth is supported. + DO NOT CHANGE THIS VALUE */ + $qop_value = "auth"; - echo "\n" . - '

' . - _("You must be logged in to access this page.").'

' . - ""._("Go to the login page")."\n" . - "\n"; - exit; + $digest_uri_value = $service . '/' . $host; + + // build the $response_value + //FIXME This will probably break badly if a server sends more than one realm + $string_a1 = utf8_encode($username).":"; + $string_a1 .= utf8_encode($result['realm']).":"; + $string_a1 .= utf8_encode($password); + $string_a1 = hmac_md5($string_a1); + $A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce; + $A1 = bin2hex(hmac_md5($A1)); + $A2 = "AUTHENTICATE:$digest_uri_value"; + // If qop is auth-int or auth-conf, A2 gets a little extra + if ($qop_value != 'auth') { + $A2 .= ':00000000000000000000000000000000'; + } + $A2 = bin2hex(hmac_md5($A2)); + + $string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value; + $response_value = bin2hex(hmac_md5($A1.":".$string_response.":".$A2)); + + $reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",'; + $reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",'; + $reply .= "digest-uri=\"$digest_uri_value\",response=$response_value"; + $reply .= ',qop=' . $qop_value; + $reply = base64_encode($reply); + return $reply . "\r\n"; + +} + +function digest_md5_parse_challenge($challenge) { +/* This function parses the challenge sent during DIGEST-MD5 authentication and + returns an array. See the RFC for details on what's in the challenge string. +*/ + $challenge=base64_decode($challenge); + while (isset($challenge)) { + if ($challenge{0} == ',') { // First char is a comma, must not be 1st time through loop + $challenge=substr($challenge,1); + } + $key=explode('=',$challenge,2); + $challenge=$key[1]; + $key=$key[0]; + if ($challenge{0} == '"') { + // We're in a quoted value + // Drop the first quote, since we don't care about it + $challenge=substr($challenge,1); + // Now explode() to the next quote, which is the end of our value + $val=explode('"',$challenge,2); + $challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop + $value=explode(',',$val[0]); + // Now, for those quoted values that are only 1 piece.. + if (sizeof($value) == 1) { + $value=$value[0]; // Convert to non-array + } + } else { + // We're in a "simple" value - explode to next comma + $val=explode(',',$challenge,2); + if (isset($val[1])) { + $challenge=$val[1]; + } else { + unset($challenge); + } + $value=$val[0]; + } + $parsed["$key"]=$value; + } // End of while loop + return $parsed; +} + +function hmac_md5($data, $key='') { + // Creates a HMAC digest that can be used for auth purposes + // See RFCs 2104, 2617, 2831 + // Uses mhash() extension if available + if (extension_loaded('mhash')) { + if ($key== '') { + $mhash=mhash(MHASH_MD5,$data); + } else { + $mhash=mhash(MHASH_MD5,$data,$key); + } + return $mhash; + } + if (!$key) { + return pack('H*',md5($data)); + } + $key = str_pad($key,64,chr(0x00)); + if (strlen($key) > 64) { + $key = pack("H*",md5($key)); + } + $k_ipad = $key ^ str_repeat(chr(0x36), 64) ; + $k_opad = $key ^ str_repeat(chr(0x5c), 64) ; + /* Heh, let's get recursive. */ + $hmac=hmac_md5($k_opad . pack("H*",md5($k_ipad . $data)) ); + return $hmac; } ?>