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+============================================
+External authentication with SemanticScuttle
+============================================
+
+Most times, one piece of software is only a part in the big puzzle
+that makes the software landscape of a company or organization.
+SemanticScuttle is not different and should integrate as nicely as
+possible with all other systems.
+
+One of the basic tasks of integration is user authentication against
+a central database - be it a central user database, an LDAP or a
+active directory server.
+
+Since version 0.96, SemanticScuttle supports user authentication against
+external systems. To provide a wide range of supported systems, we chose
+to utilize PEAR's `Authentication package`__.
+It does this by providing different "`authentication containers`__",
+for example Database, IMAP, LDAP, POP3, RADIUS, SAP and SOAP.
+
+Please be aware of the fact that, after successful authentication, the user
+and his scrambled password are stored in the SemanticScuttle database.
+This is required for proper functioning of the software. It does not mean
+that you will be able to login if your external authentication provider
+is offline - you won't, execpt you switch it off in the SemanticScuttle
+configuration.
+
+
+__ http://pear.php.net/package/Auth
+__ http://pear.php.net/manual/en/package.authentication.auth.intro-storage.php
+
+
+Basic configuration
+===================
+The default configuration file ``data/config.default.php`` has an own section
+on auth options and an explanation of the single entries.
+
+To utilize the external authentication, you need to install the
+PEAR Auth package: ::
+
+  $ pear install auth
+
+If you do not have a PEAR installation available, you can try to manually
+install the files in the src/ directory. If you choose to do that, the
+src/ directory should look similar to that: ::
+
+  src/
+   Auth.php
+   Auth/
+    Anonymous.php
+    Container.php
+    Container/
+    ..
+   SemanticScuttle/
+    header.php
+    ..
+
+After that, modify your ``data/config.php`` file. The most important change
+is to use ::
+
+  $serviceoverrides['User'] = 'SemanticScuttle_Service_AuthUser';
+
+which tells SemanticScuttle to switch to the special authentication service.
+
+Now that's done, you can configure the single auth options:
+
+``$authType = 'MDB2';``
+  selects the authentication container.
+
+``$authOptions``
+  is an array of options specific to the authentication container. Please
+  consult the PEAR Auth documentation for more information.
+
+``$authDebug = true;``
+  should be used when setup fails, since it may give important hints
+  where it fails.
+
+  Please note that login will seem to fail with
+  debugging activated. Going back to the main page after that will
+  show that you are logged in.
+
+
+
+Authentication examples
+=======================
+
+General database authentification
+---------------------------------
+Here you also need the PEAR `MDB2 package`_.
+The "``new_link``" option is important!
+
+``config.php`` settings: ::
+
+  $serviceoverrides['User'] = 'SemanticScuttle_Service_AuthUser';
+  $authType = 'MDB2';
+  $authOptions = array(
+      'dsn' => array(
+          'phptype'  => 'mysql',
+          'hostspec' => 'FIXME',
+          'username' => 'FIXME',
+          'password' => 'FIXME',
+          'database' => 'FIXME',
+          'new_link' => true,
+      ),
+      'table'       => 'usersFIXME',
+      'usernamecol' => 'usernameFIXME',
+      'passwordcol' => 'passwordFIXME',
+      'cryptType'   => 'md5',
+  );
+
+
+Mantis Bugtracker
+-----------------
+Here you also need the PEAR `MDB2 package`_.
+
+``config.php`` settings: ::
+
+  $serviceoverrides['User'] = 'SemanticScuttle_Service_AuthUser';
+  $authType = 'MDB2';
+  $authOptions = array(
+      'dsn' => array(
+          'phptype'  => 'mysql',
+          'hostspec' => 'FIXME',
+          'username' => 'FIXME',
+          'password' => 'FIXME',
+          'database' => 'FIXME',
+          'new_link' => true,
+      ),
+      'table'       => 'mantis_user_table',
+      'usernamecol' => 'username',
+      'passwordcol' => 'password',
+      'cryptType'   => 'md5',
+  );
+
+.. _MDB2 package: http://pear.php.net/package/MDB2
+
+
+MediaWiki
+---------
+Unfortunately, the password column does not contain a simple hashed
+password - for good reasons as described on
+http://www.mediawiki.org/wiki/Manual_talk:User_table#user_password_column
+
+If you configure your MediaWiki_ to use passwords without salt, you
+can make it work nevertheless:
+
+MediaWiki ``LocalSettings.php``: ::
+
+  $wgPasswordSalt = false;
+
+\- after that, users need to change/update their passwords to get them
+unsalted in the database. You can verify if the passwords are unhashed
+if you do ::
+
+  SELECT CAST( user_password AS CHAR ) FROM user
+
+on your MediaWiki database. Passwords prefixed with "``:A:``" can be used.
+
+Another problem is that mediawiki user names begin with an uppercase letter.
+You need to modify ``www/login.php`` and remove the "``utf8_strtolower``" function
+call: ::
+
+  $posteduser = trim(utf8_strtolower(POST_USERNAME));
+
+becomes ::
+
+  $posteduser = trim(POST_USERNAME);
+
+
+``config.php`` settings: ::
+
+  $serviceoverrides['User'] = 'SemanticScuttle_Service_AuthUser';
+  $authType = 'MDB2';
+  $authOptions = array(
+      'dsn' => array(
+          'phptype'  => 'mysql',
+          'hostspec' => 'FIXME',
+          'username' => 'FIXME',
+          'password' => 'FIXME',
+          'database' => 'FIXME',
+          'new_link' => true,
+      ),
+      'table'       => 'user',
+      'usernamecol' => 'user_name',
+      'passwordcol' => 'user_password',
+      'cryptType'   => 'md5_mediawiki',
+  );
+  function md5_mediawiki($password) {
+      return ':A:' . md5($password);
+  }
+
+
+.. _MediaWiki: http://www.mediawiki.org/wiki/MediaWiki
+
+Active Directory / LDAP
+-----------------------
+Here we authenticate against an active directory server.
+
+``config.php`` settings: ::
+
+  $serviceoverrides['User'] = 'SemanticScuttle_Service_AuthUser';
+  $authType = 'LDAP';
+  $authOptions = array(
+      'host'     => '192.168.1.4',
+      'version'  => 3,
+      'basedn'   => 'DC=EXAMPLE,DC=ORG',
+      'binddn'   => 'readuser',
+      'bindpw'   => 'readuser',
+      'userattr' => 'sAMAccountName',
+      'userfilter' => '(objectClass=user)',
+      'attributes' => array(''),
+  );
+  $authEmailSuffix = '@example.org';
+