OpenID

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Understanding

Identity provider (OpenID provider)

Service providers

  • Big ones
  • Flickr should become one soon...
  • OpenMinds is probably the first Belgian provider
  • Estonians can use their eID as OpenID
    According to this blog this should cover other European countries such as Belgium as well
  • Why Belgium government doesn't provide OpenID through eID as well??
  • Actually it seems someone will propose it soon but it's US based!
  • Ok let's try ourselves
  • TrustBearer OpenID supports the Belgian eID, as well as several other smart card and biometric devices as authentication tokens. See a demo using the Belgian eID here.

Be your own!

  • phpMyID
    • Standalone, single user, OpenID Identity Provider
    • Very easy to set up!
    • Authentication based on HTTP Digest
    • Supports also pavatar and MicroID
    • You'd better use it with php5 as php4 is lackind the modpow operation and the emulation is very slow.
  • Here is a patch (you can download it here) to switch to HTTPS before you type your password, on top of HTTP Digest.
--- MyID.php.orig       2008-04-25 23:07:13.000000000 +0200
+++ MyID.php    2008-04-25 23:36:09.000000000 +0200
@@ -203,6 +203,9 @@
        if (! isset($_SESSION['post_auth_url']) || ! isset($_SESSION['cancel_auth_url']))
                error_500('You may not access this mode directly.');
 
+       if( $_SERVER['HTTPS'] != 'on') { 
+           wrap_refresh('https://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']); 
+       } 
        // try to get the digest headers - what a PITA!
        if (function_exists('apache_request_headers') && ini_get('safe_mode') == false) {
                $arh = apache_request_headers();
@@ -453,7 +456,7 @@
        );
 
        // if the user is not logged in, transfer to the authorization mode
-       if ($profile['authorized'] === false || $identity != $_SESSION['auth_url']) {
+       if ($profile['authorized'] === false || str_replace($GLOBALS['proto'], "https", $identity) != $_SESSION['auth_url']) {
                // users can only be logged in to one url at a time
                $_SESSION['auth_username'] = null;
                $_SESSION['auth_url'] = null;
@@ -469,7 +472,7 @@
                        debug('Post URL: ' . $_SESSION['post_auth_url']);
 
                        $q = strpos($profile['idp_url'], '?') ? '&' : '?';
-                       wrap_refresh($profile['idp_url'] . $q . 'openid.mode=authorize');
+                       wrap_refresh(str_replace($GLOBALS['proto'], "https", $profile['idp_url']) . $q . 'openid.mode=authorize');
                } else {
                        $keys['user_setup_url'] = $profile['idp_url'];
                }

Recipes

  • There is an example given with php-openid
    apt-get install php-openid
  • OpenId for non-SuperUsers, using phpMyID, a fallback OpenID service provider and some delegation so you can use e.g. your blog URI as identity.

Relying Party (Consumer)

Mod Auth OpenID for Apache

apt-get install libapache2-mod-auth-openid

Recipes

My services

End User (OpenID Client)

  • The perl module HTTP::OpenID implements part of an HTTP Client to perform an OpenID login.

Libraries

Security

Some are worrying about easier phishing attacks as the relying party could redirect you to another identity provider than yours.
That's why it's good to have diversity and to have your own identity provider hosted at your own server, with your own style and your own authentication method
If there will be phishing, that will occur for the big OpenID providers.
But if you're using a self-signed SSL identity server, for sure man-in-the-middle SSL attack can occur much more easily so don't rely on it!
Using Digest access authentication through e.g. Apache AuthDigest over HTTP is probably a much better idea than Basic access authentication over HTTPS.

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