--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/yubikey/corelib.php	Thu Feb 26 01:08:22 2009 -0500
@@ -0,0 +1,178 @@
+<?php
+
+define('YK_SEC_NORMAL_USERNAME', 1);
+define('YK_SEC_NORMAL_PASSWORD', 2);
+define('YK_SEC_ELEV_USERNAME', 4);
+define('YK_SEC_ELEV_PASSWORD', 8);
+define('YK_SEC_ALLOW_NO_OTP', 16);
+
+define('YK_DEFAULT_VERIFY_URL', 'http://api.yubico.com/wsapi/verify');
+
+function generate_yubikey_field($name = 'yubikey_otp', $value = false)
+{
+  global $lang;
+  
+  $fid = substr(sha1(microtime() . mt_rand()), 0, 12);
+  $class = $value ? 'wasfull' : 'wasempty';
+  $html = '<input id="yubifield' . $fid . '" class="' . $class . '" type="hidden" name="' . $name . '" value="' . ( is_string($value) ? $value : '' ) . '" />';
+  if ( $value )
+  {
+    $html .= '<span id="yubistat' . $fid . '" class="yubikey_status enrolled">' . $lang->get('yubiauth_ctl_status_enrolled') . '</span>';
+    $atext = $lang->get('yubiauth_ctl_btn_change_key');
+    $classadd = ' abutton_green';
+  }
+  else
+  {
+    $html .= '<span id="yubistat' . $fid . '" class="yubikey_status empty">' . $lang->get('yubiauth_ctl_status_empty') . '</span>';
+    $atext = $lang->get('yubiauth_ctl_btn_enroll');
+    $classadd = '';
+  }
+  $html .= ' <a class="abutton' . $classadd . ' yubikey_enroll" onclick="yk_mb_init(\'yubifield' . $fid . '\', \'yubistat' . $fid . '\'); return false;" href="#enroll">' . $atext . '</a>';
+  if ( $value )
+  {
+    $html .= ' <a class="abutton abutton_red yubikey_enroll" onclick="yk_clear(\'yubifield' . $fid . '\', \'yubistat' . $fid . '\'); return false;" href="#enroll">'
+             . $lang->get('yubiauth_ctl_btn_clear') .
+             '</a>';
+  }
+  $html = '<noscript><input type="text" name="' . $name . '" class="yubikey_noscript" value="' . ( is_string($value) ? $value : '' ) . '" /> </noscript>'
+          . $html; // '<script type="text/javascript">document.write(unescape("' . rawurlencode($html) . '"));</script>';
+  return $html;
+}
+
+function yubikey_validate_otp($otp)
+{
+  $api_key = getConfig('yubikey_api_key');
+  $api_id  = getConfig('yubikey_api_key_id');
+  if ( !$api_key || !$api_id )
+  {
+    return array(
+        'success' => false,
+        'error' => 'missing_api_key'
+      );
+  }
+  if ( !preg_match('/^[cbdefghijklnrtuv]{44}$/', $otp) )
+  {
+    return array(
+        'success' => false,
+        'error' => 'otp_invalid_chars'
+      );
+  }
+  // make HTTP request
+  require_once( ENANO_ROOT . '/includes/http.php' );
+  $auth_url = getConfig('yubikey_auth_server', YK_DEFAULT_VERIFY_URL);
+  $auth_url = preg_replace('#^https?://#i', '', $auth_url);
+  if ( !preg_match('#^(\[?[a-z0-9-:]+(?:\.[a-z0-9-:]+\]?)*)(/.*)$#', $auth_url, $match) )
+  {
+    return array(
+        'success' => false,
+        'error' => 'invalid_auth_url'
+      );
+  }
+  $auth_server =& $match[1];
+  $auth_uri =& $match[2];
+  $req = new Request_HTTP($auth_server, $auth_uri);
+  $req->add_get('id', strval($api_id));
+  $req->add_get('otp', $otp);
+  $req->add_get('h', yubikey_sign($req->parms_get));
+  
+  $response = $req->get_response_body();
+  
+  if ( $req->response_code != HTTP_OK )
+  {
+    return array(
+        'success' => false,
+        'error' => 'http_response_error'
+      );
+  }
+  $response = trim($response);
+  $response_nosig = preg_replace('/^h=(.+?)$/m', '', $response);
+  if ( !preg_match_all('/^([a-z0-9_]+)=(.*?)$/m', $response, $matches) )
+  {
+    return array(
+        'success' => false,
+        'error' => 'malformed_response'
+      );
+  }
+  $response = array();
+  foreach ( $matches[0] as $i => $_ )
+  {
+    $response[$matches[1][$i]] = $matches[2][$i];
+  }
+  // make sure we have a status
+  if ( !isset($response['status']) )
+  {
+    return array(
+        'success' => false,
+        'error' => 'response_missing_status'
+      );
+  }
+  // verify response signature
+  // MISSING_PARAMETER is the ONLY situation under which an unsigned response is acceptable
+  if ( $response['status'] !== 'MISSING_PARAMETER' )
+  {
+    if ( !isset($response['h']) )
+    {
+      return array(
+          'success' => false,
+          'error' => 'response_missing_sig'
+        );
+    }
+    if ( yubikey_sign($response) !== $response['h'] )
+    {
+      return array(
+          'success' => false,
+          'error' => 'response_invalid_sig'
+        );
+    }
+  }
+  if ( $response['status'] === 'OK' )
+  {
+    return array(
+        'success' => true
+      );
+  }
+  else
+  {
+    return array(
+        'success' => false,
+        'error' => strtolower("response_{$response['status']}")
+      );
+  }
+}
+
+function yubikey_sign($arr)
+{
+  static $api_key = false;
+  
+  ksort($arr);
+  if ( isset($arr['h']) )
+    unset($arr['h']);
+  
+  if ( !$api_key )
+  {
+    $api_key = getConfig('yubikey_api_key');
+    $api_key = hexencode(base64_decode($api_key), '', '');
+  }
+  
+  $req = array();
+  foreach ( $arr as $key => $val )
+  {
+    $req[] = "$key=$val";
+  }
+  $req = implode('&', $req);
+  
+  $sig = hmac_sha1($req, $api_key);
+  $sig = hexdecode($sig);
+  $sig = base64_encode($sig);
+  
+  return $sig;
+}
+
+$plugins->attachHook('compile_template', 'yubikey_attach_headers($this);');
+
+function yubikey_attach_headers(&$template)
+{
+  $template->add_header('<script type="text/javascript" src="' . scriptPath . '/plugins/yubikey/yubikey.js"></script>');
+  $template->add_header('<link rel="stylesheet" type="text/css" href="' . scriptPath . '/plugins/yubikey/yubikey.css" />');
+}
+