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 https://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     'https://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  * @param string $contents Content to include in page
  37  *
  38  * @return void
  39  */
  40 function Show_page($contents)
  41 {
  42     header('Content-Type: text/html; charset=utf-8');
  43     echo '<?xml version="1.0" encoding="utf-8"?>' , "\n";
  44     ?>
  45     <!DOCTYPE HTML>
  46     <html lang="en" dir="ltr">
  47     <head>
  48     <link rel="icon" href="../favicon.ico" type="image/x-icon" />
  49     <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
  50     <meta charset="utf-8" />
  51     <title>phpMyAdmin OpenID signon example</title>
  52     </head>
  53     <body>
  54     <?php
  55     if (isset($_SESSION) && isset($_SESSION['PMA_single_signon_error_message'])) {
  56         echo '<p class="error">' , $_SESSION['PMA_single_signon_message'] , '</p>';
  57         unset($_SESSION['PMA_single_signon_message']);
  58     }
  59     echo $contents;
  60     ?>
  61     </body>
  62     </html>
  63     <?php
  64 }
  65
  66 function Die_error($e)
  67 {
  68     $contents = "<div class='relyingparty_results'>\n";
  69     $contents .= "<pre>" . htmlspecialchars($e->getMessage()) . "</pre>\n";
  70     $contents .= "</div class='relyingparty_results'>";
  71     Show_page($contents);
  72     exit;
  73 }
  74
  75
  76 /* Need to have cookie visible from parent directory */
  77 session_set_cookie_params(0, '/', '', true, true);
  78 /* Create signon session */
  79 $session_name = 'SignonSession';
  80 session_name($session_name);
  81 @session_start();
  82
  83 // Determine realm and return_to
  84 $base = 'http';
  85 if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
  86     $base .= 's';
  87 }
  88 $base .= '://' . $_SERVER['SERVER_NAME'] . ':' . $_SERVER['SERVER_PORT'];
  89
  90 $realm = $base . '/';
  91 $returnTo = $base . dirname($_SERVER['PHP_SELF']);
  92 if ($returnTo[mb_strlen($returnTo) - 1] != '/') {
  93     $returnTo .= '/';
  94 }
  95 $returnTo .= 'openid.php';
  96
  97 /* Display form */
  98 if (!count($_GET) && !count($_POST) || isset($_GET['phpMyAdmin'])) {
  99     /* Show simple form */
 100     $content = '<form action="openid.php" method="post">
 101 OpenID: <input type="text" name="identifier" /><br />
 102 <input type="submit" name="start" />
 103 </form>
 104 </body>
 105 </html>';
 106     Show_page($content);
 107     exit;
 108 }
 109
 110 /* Grab identifier */
 111 if (isset($_POST['identifier']) && is_string($_POST['identifier'])) {
 112     $identifier = $_POST['identifier'];
 113 } else if (isset($_SESSION['identifier']) && is_string($_SESSION['identifier'])) {
 114     $identifier = $_SESSION['identifier'];
 115 } else {
 116     $identifier = null;
 117 }
 118
 119 /* Create OpenID object */
 120 try {
 121     $o = new OpenID_RelyingParty($returnTo, $realm, $identifier);
 122 } catch (Exception $e) {
 123     Die_error($e);
 124 }
 125
 126 /* Redirect to OpenID provider */
 127 if (isset($_POST['start'])) {
 128     try {
 129         $authRequest = $o->prepare();
 130     } catch (Exception $e) {
 131         Die_error($e);
 132     }
 133
 134     $url = $authRequest->getAuthorizeURL();
 135
 136     header("Location: $url");
 137     exit;
 138 } else {
 139     /* Grab query string */
 140     if (!count($_POST)) {
 141         list(, $queryString) = explode('?', $_SERVER['REQUEST_URI']);
 142     } else {
 143         // I hate php sometimes
 144         $queryString = file_get_contents('php://input');
 145     }
 146
 147     /* Check reply */
 148     try {
 149         $message = new OpenID_Message($queryString, OpenID_Message::FORMAT_HTTP);
 150     } catch (Exception $e) {
 151         Die_error($e);
 152     }
 153
 154     $id = $message->get('openid.claimed_id');
 155
 156     if (!empty($id) && isset($AUTH_MAP[$id])) {
 157         $_SESSION['PMA_single_signon_user'] = $AUTH_MAP[$id]['user'];
 158         $_SESSION['PMA_single_signon_password'] = $AUTH_MAP[$id]['password'];
 159         session_write_close();
 160         /* Redirect to phpMyAdmin (should use absolute URL here!) */
 161         header('Location: ../index.php');
 162     } else {
 163         Show_page('<p>User not allowed!</p>');
 164         exit;
 165     }
 166 }