README

This module implements Auth MemCookie support for SimpleSAMLphp. This allows you to integrate SimpleSAMLphp with web applications written in languages other than PHP.

AuthMemCookie works by reading authentication data from a memcache server and setting environment variables based on the attributes found in this data. It also allows you to use the default Apache access control features to restrict access to your site.

Requisites

This module requires you to install and set up the following requirements:

SimpleSAMLphp running as a Service Provider.
A memcache server.
Auth MemCookie .

Installation

Once you have installed SimpleSAMLphp, installing this module is very simple. First of all, you will need to download Composer if you haven't already. After installing Composer, just execute the following command in the root of your SimpleSAMLphp installation:

composer.phar require simplesamlphp/simplesamlphp-module-memcookie:dev-master

where dev-master instructs Composer to install the master branch from the Git repository. See the releases available if you want to use a stable version of the module.

Configuration

Next thing you need to do is to enable the module:

in config.php, search for the module.enable key and set memcookie to true:

    'module.enable' => [ 'memcookie' => true, … ],

The first step to use this module is to configure Auth MemCookie appropriately. The following example (that you can find also in extra/auth_memcookie.conf) might be helpful:

<Location />
    # This is a list of memcache servers which Auth MemCookie
    # should use. 
    # Note that this list must list the same servers as the
    # 'authmemcookie.servers'-option in config.php in the
    # configuration for simpleSAMLphp.
    #
    # The syntax for this option is inherited from: http://docs.libmemcached.org/libmemcached_configuration.html 
    Auth_memCookie_Memcached_Configuration "--SERVER=127.0.0.1:11211"

    # This must be set to 'on' to enable Auth MemCookie for
    # this directory.
    Auth_memCookie_Authoritative on

    # This adjusts the maximum number of data elements in the
    # session data. The default is 10, which can be to low.
    Auth_memCookie_SessionTableSize "40"

    # These two commands are required to enable access control
    # in Apache.
    AuthType Cookie
    AuthName "My Login"

    # This command causes apache to redirect to the given
    # URL when we receive a '401 Authorization Required'
    # error. We redirect to "/simplesaml/module.php/memcookie/auth.php",
    # which initializes a login to the IdP.
    ErrorDocument 401 "/simplesaml/module.php/memcookie/auth.php"
</Location>

<Location /protected>
    # This allows all authenticated users to access the
    # directory. To learn more about the 'Require' command,
    # please look at:
    # http://httpd.apache.org/docs/2.0/mod/core.html#require
    Require valid-user
</Location>

Once Auth MemCookie has been correctly configured, you need to configure the module itself by editing the config/authmemcookie.php file. Set the username configuration option to the name of an attribute that you are sure to receive and that will identify the user unambiguously. Read the instructions in the file itself if you need help to configure it.

If you already have an auth source configured and working in SimpleSAMLphp, and all your memcookie configuration options are correct, you are ready to go! Make sure to reload Apache so that it uses the new configuration and Auth MemCookie is loaded. Then you can point your browser to the location that you have protected in Apache and it should redirect you automatically to the IdP for authentication.

In order to see all the environment variables you have available in the protected location, you can drop a PHP script like the following in there and access it from your browser after authenticating to your IdP:

<html>
 <body>
  <table>
<?php
    foreach ($_SERVER as $key => $value) {
        echo "   <tr><td>".htmlspecialchars($key)."</td><td>".htmlspecialchars($value)."</td></tr>\n";
    }
?>
  </table>
 </body>
</html>

simplesamlphp / simplesamlphp-module-memcookie

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