phpmyadmin/examples/openid.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * Single signon for phpMyAdmin using OpenID
   5  *
   6  * This is just example how to use single signon with phpMyAdmin, it is
   7  * not intended to be perfect code and look, only shows how you can
   8  * integrate this functionality in your application.
   9  *
  10  * It uses OpenID pear package, see http://pear.php.net/package/OpenID
  11  *
  12  * User first authenticates using OpenID and based on content of $AUTH_MAP
  13  * the login information is passed to phpMyAdmin in session data.
  14  *
  15  * @package    PhpMyAdmin
  16  * @subpackage Example
  17  */
  18
  19 if (false === @include_once 'OpenID/RelyingParty.php') {
  20     exit;
  21 }
  22
  23 /**
  24  * Map of authenticated users to MySQL user/password pairs.
  25  */
  26 $AUTH_MAP = array(
  27     'http://launchpad.net/~username' => array(
  28         'user' => 'root',
  29         'password' => '',
  30         ),
  31     );
  32
  33 /**
  34  * Simple function to show HTML page with given content.
  35  *
  36  * @return void
  37  */
  38 function show_page($contents)
  39 {
  40     header('Content-Type: text/html; charset=utf-8');
  41     echo '<?xml version="1.0" encoding="utf-8"?>' . "\n";
  42     ?>
  43 <!DOCTYPE HTML>
  44 <html lang="en" dir="ltr">
  45 <head>
  46     <link rel="icon" href="../favicon.ico" type="image/x-icon" />
  47     <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
  48     <meta charset="utf-8" />
  49     <title>phpMyAdmin OpenID signon example</title>
  50 </head>
  51 <body>
  52 <?php
  53 if (isset($_SESSION) && isset($_SESSION['PMA_single_signon_error_message'])) {
  54     echo '<p class="error">' . $_SESSION['PMA_single_signon_message'] . '</p>';
  55     unset($_SESSION['PMA_single_signon_message']);
  56 }
  57 echo $contents;
  58 ?>
  59 </body>
  60 </html>
  61 <?php
  62 }
  63
  64 /* Need to have cookie visible from parent directory */
  65 session_set_cookie_params(0, '/', '', 0);
  66 /* Create signon session */
  67 $session_name = 'SignonSession';
  68 session_name($session_name);
  69 session_start();
  70
  71 // Determine realm and return_to
  72 $base = 'http';
  73 if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
  74     $base .= 's';
  75 }
  76 $base .= '://' . $_SERVER['SERVER_NAME'] . ':' . $_SERVER['SERVER_PORT'];
  77
  78 $realm = $base . '/';
  79 $returnTo = $base . dirname($_SERVER['PHP_SELF']);
  80 if ($returnTo[strlen($returnTo) - 1] != '/') {
  81     $returnTo .= '/';
  82 }
  83 $returnTo .= 'openid.php';
  84
  85 /* Display form */
  86 if (!count($_GET) && !count($_POST) || isset($_GET['phpMyAdmin'])) {
  87     /* Show simple form */
  88     $content = '<form action="openid.php" method="post">
  89 OpenID: <input type="text" name="identifier" /><br />
  90 <input type="submit" name="start" />
  91 </form>
  92 </body>
  93 </html>';
  94     show_page($content);
  95     exit;
  96 }
  97
  98 /* Grab identifier */
  99 if (isset($_POST['identifier'])) {
 100     $identifier = $_POST['identifier'];
 101 } else if (isset($_SESSION['identifier'])) {
 102     $identifier = $_SESSION['identifier'];
 103 } else {
 104     $identifier = null;
 105 }
 106
 107 /* Create OpenID object */
 108 try {
 109     $o = new OpenID_RelyingParty($returnTo, $realm, $identifier);
 110 } catch (OpenID_Exception $e) {
 111     $contents = "<div class='relyingparty_results'>\n";
 112     $contents .= "<pre>" . $e->getMessage() . "</pre>\n";
 113     $contents .= "</div class='relyingparty_results'>";
 114     show_page($contents);
 115     exit;
 116 }
 117
 118 /* Redirect to OpenID provider */
 119 if (isset($_POST['start'])) {
 120     try {
 121         $authRequest = $o->prepare();
 122     } catch (OpenID_Exception $e) {
 123         $contents = "<div class='relyingparty_results'>\n";
 124         $contents .= "<pre>" . $e->getMessage() . "</pre>\n";
 125         $contents .= "</div class='relyingparty_results'>";
 126         show_page($contents);
 127         exit;
 128     }
 129
 130     $url = $authRequest->getAuthorizeURL();
 131
 132     header("Location: $url");
 133     exit;
 134 } else {
 135     /* Grab query string */
 136     if (!count($_POST)) {
 137         list(, $queryString) = explode('?', $_SERVER['REQUEST_URI']);
 138     } else {
 139         // I hate php sometimes
 140         $queryString = file_get_contents('php://input');
 141     }
 142
 143     /* Check reply */
 144     $message = new OpenID_Message($queryString, OpenID_Message::FORMAT_HTTP);
 145
 146     $id = $message->get('openid.claimed_id');
 147
 148     if (!empty($id) && isset($AUTH_MAP[$id])) {
 149         $_SESSION['PMA_single_signon_user'] = $AUTH_MAP[$id]['user'];
 150         $_SESSION['PMA_single_signon_password'] = $AUTH_MAP[$id]['password'];
 151         session_write_close();
 152         /* Redirect to phpMyAdmin (should use absolute URL here!) */
 153         header('Location: ../index.php');
 154     } else {
 155         show_page('<p>User not allowed!</p>');
 156         exit;
 157     }
 158 }