scripts/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 require_once 'OpenID/RelyingParty.php';
  20
  21 /**
  22  * Map of authenticated users to MySQL user/password pairs.
  23  */
  24 $AUTH_MAP = array(
  25     'http://launchpad.net/~username' => array(
  26         'user' => 'root',
  27         'password' => '',
  28         ),
  29     );
  30
  31 /**
  32  * Simple function to show HTML page with given content.
  33  */
  34 function show_page($contents) {
  35     header('Content-Type: text/html; charset=utf-8');
  36     echo '<?xml version="1.0" encoding="utf-8"?>' . "\n";
  37     ?>
  38 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  39     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  40 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
  41 <head>
  42     <link rel="icon" href="../favicon.ico" type="image/x-icon" />
  43     <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
  44     <title>phpMyAdmin OpenID signon example</title>
  45 </head>
  46 <body>
  47 <?php
  48 if (isset($_SESSION) && isset($_SESSION['PMA_single_signon_error_message'])) {
  49     echo '<p class="error">' . $_SESSION['PMA_single_signon_message'] . '</p>';
  50     unset($_SESSION['PMA_single_signon_message']);
  51 }
  52 echo $contents;
  53 ?>
  54 </body>
  55 </html>
  56 <?php
  57 }
  58
  59 /* Need to have cookie visible from parent directory */
  60 session_set_cookie_params(0, '/', '', 0);
  61 /* Create signon session */
  62 $session_name = 'SignonSession';
  63 session_name($session_name);
  64 session_start();
  65
  66 // Determine realm and return_to
  67 $base = 'http';
  68 if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
  69     $base .= 's';
  70 }
  71 $base .= '://' . $_SERVER['SERVER_NAME'] . ':' . $_SERVER['SERVER_PORT'];
  72
  73 $realm = $base . '/';
  74 $returnTo = $base . dirname($_SERVER['PHP_SELF']);
  75 if ($returnTo[strlen($returnTo) - 1] != '/') {
  76     $returnTo .= '/';
  77 }
  78 $returnTo .= 'openid.php';
  79
  80 /* Display form */
  81 if (!count($_GET) && !count($_POST) || isset($_GET['phpMyAdmin'])) {
  82     /* Show simple form */
  83     $content = '<form action="openid.php" method="post">
  84 OpenID: <input type="text" name="identifier" /><br />
  85 <input type="submit" name="start" />
  86 </form>
  87 </body>
  88 </html>';
  89     show_page($content);
  90     exit;
  91 }
  92
  93 /* Grab identifier */
  94 if (isset($_POST['identifier'])) {
  95     $identifier = $_POST['identifier'];
  96 } else if (isset($_SESSION['identifier'])) {
  97     $identifier = $_SESSION['identifier'];
  98 } else {
  99     $identifier = null;
 100 }
 101
 102 /* Create OpenID object */
 103 try {
 104     $o = new OpenID_RelyingParty($returnTo, $realm, $identifier);
 105 } catch (OpenID_Exception $e) {
 106     $contents = "<div class='relyingparty_results'>\n";
 107     $contents .= "<pre>" . $e->getMessage() . "</pre>\n";
 108     $contents .= "</div class='relyingparty_results'>";
 109     show_page($contents);
 110     exit;
 111 }
 112
 113 /* Redirect to OpenID provider */
 114 if (isset($_POST['start'])) {
 115     try {
 116         $authRequest = $o->prepare();
 117     } catch (OpenID_Exception $e) {
 118         $contents = "<div class='relyingparty_results'>\n";
 119         $contents .= "<pre>" . $e->getMessage() . "</pre>\n";
 120         $contents .= "</div class='relyingparty_results'>";
 121         show_page($contents);
 122         exit;
 123     }
 124
 125     $url = $authRequest->getAuthorizeURL();
 126
 127     header("Location: $url");
 128     exit;
 129 } else {
 130     /* Grab query string */
 131     if (!count($_POST)) {
 132         list(, $queryString) = explode('?', $_SERVER['REQUEST_URI']);
 133     } else {
 134         // I hate php sometimes
 135         $queryString = file_get_contents('php://input');
 136     }
 137
 138     /* Check reply */
 139     $message = new OpenID_Message($queryString, OpenID_Message::FORMAT_HTTP);
 140
 141     $id = $message->get('openid.claimed_id');
 142
 143     if (!empty($id) && isset($AUTH_MAP[$id])) {
 144         $_SESSION['PMA_single_signon_user'] = $AUTH_MAP[$id]['user'];
 145         $_SESSION['PMA_single_signon_password'] = $AUTH_MAP[$id]['password'];
 146         session_write_close();
 147         /* Redirect to phpMyAdmin (should use absolute URL here!) */
 148         header('Location: ../index.php');
 149     } else {
 150         show_page('<p>User not allowed!</p>');
 151         exit;
 152     }
 153 }