X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=functions%2Fauth.php;h=72a7b75eca5c6f6b38479f5eb168ac2672e98799;hb=19d01c6b200dfd6317e4a933325d903ba2901726;hp=83affbe6ea4568e484a21f3857ea0851ed3e2f5c;hpb=5afe02cfab408727fec98ffafa8556e3278d2691;p=squirrelmail.git

diff --git a/functions/auth.php b/functions/auth.php
index 83affbe6..72a7b75e 100644
--- a/functions/auth.php
+++ b/functions/auth.php
@@ -3,31 +3,243 @@
 /**
  * auth.php
  *
- * Copyright (c) 1999-2002 The SquirrelMail Project Team
+ * Copyright (c) 1999-2004 The SquirrelMail Project Team
  * Licensed under the GNU GPL. For full terms see the file COPYING.
  *
  * Contains functions used to do authentication.
  *
- * $Id$
+ * @version $Id$
+ * @package squirrelmail
  */
 
-/* If a user opens a new session then comes back to this one,
- * $base_uri isn't set because it the session is invalid.
- */
+/** Put in a safety net here, in case a naughty admin didn't run conf.pl when they upgraded */
+
+if (! isset($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($base_uri)) {
-    $base_uri = dirname(dirname($PHP_SELF)) . "/";
+if (! isset($use_smtp_tls)) {
+  $use_smtp_tls = false;
 }
 
+/**
+ * Check if user has previously logged in to the Squirrelmail session.  If user
+ * has not logged in, execution will stop inside this function.
+ *
+ * @return int A positive value is returned if user has previously logged in
+ * successfully.
+ */
 function is_logged_in() {
 
-    if ( session_is_registered('user_is_logged_in') ) {
+    if ( sqsession_is_registered('user_is_logged_in') ) {
         return;
     } else {
-        include_once( '../functions/display_messages.php' );
+        global $PHP_SELF, $session_expired_post, 
+	       $session_expired_location, $squirrelmail_language;
+
+        /*  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($session_expired_location,'session_expired_location');
+        }
+        include_once( SM_PATH . 'functions/display_messages.php' );
+        set_up_language($squirrelmail_language, true);
         logout_error( _("You must be logged in to access this page.") );
         exit;
     }
 }
 
-?>
\ No newline at end of file
+/**
+ * Given the challenge from the server, supply the response using cram-md5 (See
+ * RFC 2195 for details)
+ *
+ * @param string $username User ID
+ * @param string $password User password supplied by User
+ * @param string $challenge The challenge supplied by the server
+ * @return string The response to be sent to the IMAP server
+ *
+ */
+function cram_md5_response ($username,$password,$challenge) {
+    $challenge=base64_decode($challenge);
+    $hash=bin2hex(hmac_md5($challenge,$password));
+    $response=base64_encode($username . " " . $hash) . "\r\n";
+    return $response;
+}
+
+/**
+ * Return Digest-MD5 response.
+ * Given the challenge from the server, calculate and return the
+ * response-string for digest-md5 authentication.  (See RFC 2831 for more
+ * details)
+ *
+ * @param string $username User ID
+ * @param string $password User password supplied by User
+ * @param string $challenge The challenge supplied by the server
+ * @param string $service The service name, usually 'imap'; it is used to
+ *   define the digest-uri.
+ * @param string $host The host name, usually the server's FQDN; it is used to
+ *   define the digest-uri.
+ * @return string The response to be sent to the IMAP server
+ */
+function digest_md5_response ($username,$password,$challenge,$service,$host) {
+  $result=digest_md5_parse_challenge($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";
+
+  /* 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";
+
+  $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";
+ 
+}
+
+/**
+ * Parse Digest-MD5 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.
+ *
+ * @param string $challenge Digest-MD5 Challenge
+ * @return array Digest-MD5 challenge decoded data
+ */
+function digest_md5_parse_challenge($challenge) {
+  $challenge=base64_decode($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;
+}
+
+/**
+ * Creates a HMAC digest that can be used for auth purposes
+ * See RFCs 2104, 2617, 2831
+ * Uses mhash() extension if available
+ *
+ * @param string $data Data to apply hash function to.
+ * @param string $key Optional key, which, if supplied, will be used to
+ * calculate data's HMAC.
+ * @return string HMAC Digest string
+ */
+function hmac_md5($data, $key='') {
+    if (extension_loaded('mhash')) {
+      if ($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;
+}
+
+/** 
+ * Fillin user and password based on SMTP auth settings.
+ *
+ * @param string $user Reference to SMTP username
+ * @param string $pass Reference to SMTP password (unencrypted)
+ */
+function get_smtp_user(&$user, &$pass) {
+    global $username, $smtp_auth_mech, 
+           $smtp_sitewide_user, $smtp_sitewide_pass;
+
+    if ($smtp_auth_mech == 'none') {
+        $user = '';
+        $pass = '';
+    } elseif ( isset($smtp_sitewide_user) && isset($smtp_sitewide_pass) ) {
+        $user = $smtp_sitewide_user;
+        $pass = $smtp_sitewide_pass;
+    } else {
+        global $key, $onetimepad;
+        $user = $username;
+        $pass = OneTimePadDecrypt($key, $onetimepad);
+    }
+}
+
+?>