Merging in the tassium-auth branch.

[squirrelmail.git] / functions / auth.php

diff --git a/functions/auth.php b/functions/auth.php
index 24c92ff013d515abed01f4950cefa5b6636e2ad8..0de160c91499c646c2a6927eefc7de09c9b64b37 100644 (file)
--- a/functions/auth.php
+++ b/functions/auth.php
@@ -11,6 +11,24 @@
  * $Id$
  */
 
+/* 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)) {
+  $imap_auth_mech = 'plain';
+}
+
+if (! isset($use_imap_tls)) {
+  $use_imap_tls = false;
+}
+
+if (! isset($use_smtp_tls)) {
+  $use_smtp_tls = false;
+}
+
 function is_logged_in() {
 
     if ( sqsession_is_registered('user_is_logged_in') ) {
@@ -37,4 +55,99 @@ function is_logged_in() {
     }
 }
 
+function cram_md5_response ($username,$password,$challenge) {
+
+/* Given the challenge from the server, supply the response using
+   cram-md5 (See RFC 2195 for details)
+   NOTE: Requires mhash extension to PHP
+*/
+$challenge=base64_decode($challenge);
+$hash=bin2hex(mhash(MHASH_MD5,$challenge,$password));
+$response=base64_encode($username . " " . $hash) . "\r\n";
+return $response;
+}
+
+function digest_md5_response ($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(mhash(MHASH_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 = mhash(MHASH_MD5, $string_a1);
+  $A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce;
+  $A1 = bin2hex(mhash(MHASH_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(mhash(MHASH_MD5, $A2));
+
+  $string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value;
+  $response_value = bin2hex(mhash(MHASH_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 (strlen($challenge)) {
+    if ($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);
+      $challenge=$val[1];
+      $value=$val[0];
+    }
+    $parsed["$key"]=$value;
+  } // End of while loop
+  return $parsed;
+}
+
 ?>