diff --git a/app/models/user.rb b/app/models/user.rb
index 393e47d7a..3fb778fce 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -60,96 +60,26 @@ class User < ApplicationModel
       return false
     end
 
-    # use auth backends
-    config = [
-      {
-        :adapter => 'internal',
-      },
-      {
-        :adapter => 'test',
-      },
-    ]
-    Setting.where( :area => 'Security::Authentication' ).each {|setting|
-      if setting.state[:value]
-        config.push setting.state[:value]
-      end
-    }
-
-    # try to login against configure auth backends
-    user_auth = nil
-    config.each {|config_item|
-      next if !config_item[:adapter]
-      next if config_item.class == TrueClass
-      file = "auth/#{config_item[:adapter]}"
-      require file
-      user_auth = Auth.const_get("#{config_item[:adapter].to_s.upcase}").check( username, password, config_item, user )
-
-      # auth ok
-      if user_auth
-
-        # remember last login date
-        user_auth.update_last_login
-
-        # reset login failed
-        user_auth.login_failed = 0
-        user_auth.save
-
-        return user_auth
-      end
-    }
+    user_auth = Auth.check( username, password, user )
 
     # set login failed +1
     if !user_auth && user
+      sleep 1
       user.login_failed = user.login_failed + 1
       user.save
     end
 
-    # auth failed
-    sleep 1
+    # auth ok
     return user_auth
   end
 
   def self.sso(params)
 
-    # use auth backends
-    config = [
-      {
-        :adapter => 'env',
-      },
-      {
-        :adapter => 'otrs',
-      },
-    ]
-    #    Setting.where( :area => 'Security::Authentication' ).each {|setting|
-    #      if setting.state[:value]
-    #        config.push setting.state[:value]
-    #      end
-    #    }
-
     # try to login against configure auth backends
-    user_auth = nil
-    config.each {|config_item|
-      next if !config_item[:adapter]
-      next if config_item.class == TrueClass
-      file = "sso/#{config_item[:adapter]}"
-      require file
-      user_auth = SSO.const_get("#{config_item[:adapter].to_s.upcase}").check( params, config_item )
+    user_auth = Sso.check( params, user )
+    return if !user_auth
 
-      # auth ok
-      if user_auth
-
-        # remember last login date
-        user_auth.update_last_login
-
-        # reset login failed
-        user_auth.login_failed = 0
-        user_auth.save
-
-        return user_auth
-      end
-    }
-
-    return false
+    return user_auth
   end
 
   def self.create_from_hash!(hash)
diff --git a/db/seeds.rb b/db/seeds.rb
index 0e373b66f..597b082bf 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -250,7 +250,7 @@ Setting.create_if_not_exists(
   :area        => 'Security::Authentication',
   :description => 'Enables user authentication via OTRS.',
   :state    => {
-    :adapter           => 'otrs',
+    :adapter           => 'Auth::Otrs',
     :required_group_ro => 'stats',
     :group_rw_role_map => {
       'admin' => 'Admin',
@@ -271,7 +271,7 @@ Setting.create_if_not_exists(
   :area        => 'Security::Authentication',
   :description => 'Enables user authentication via LDAP.',
   :state    => {
-    :adapter        => 'ldap',
+    :adapter        => 'Auth::Ldap',
     :host           => 'localhost',
     :port           => 389,
     :bind_dn        => 'cn=Manager,dc=example,dc=org',
diff --git a/lib/auth.rb b/lib/auth.rb
new file mode 100644
index 000000000..85b1e0867
--- /dev/null
+++ b/lib/auth.rb
@@ -0,0 +1,63 @@
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+class Auth < ApplicationLib
+
+=begin
+
+authenticate user via username and password
+
+  result = Auth.check( username, password, user )
+
+returns
+
+  result = user_model # if authentication was successfully
+
+=end
+
+  def self.check(username, password, user)
+
+    # use std. auth backends
+    config = [
+      {
+        :adapter => 'Auth::Internal',
+      },
+      {
+        :adapter => 'Auth::Test',
+      },
+    ]
+
+    # added configured backends
+    Setting.where( :area => 'Security::Authentication' ).each {|setting|
+      if setting.state[:value]
+        config.push setting.state[:value]
+      end
+    }
+
+    # try to login against configure auth backends
+    user_auth = nil
+    config.each {|config_item|
+      next if !config_item[:adapter]
+
+      # load backend
+      backend = self.load_adapter( config_item[:adapter] )
+      return if !backend
+
+      user_auth = backend.check( username, password, config_item, user )
+
+      # auth ok
+      if user_auth
+
+        # remember last login date
+        user_auth.update_last_login
+
+        # reset login failed
+        user_auth.login_failed = 0
+        user_auth.save
+
+        return user_auth
+      end
+    }
+    return
+
+  end
+end
diff --git a/lib/auth/internal.rb b/lib/auth/internal.rb
index 923eb3136..48d69bc8b 100644
--- a/lib/auth/internal.rb
+++ b/lib/auth/internal.rb
@@ -1,6 +1,6 @@
-module Auth
-end
-module Auth::INTERNAL
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+module Auth::Internal
   def self.check( username, password, config, user )
 
     # return if no user exists
diff --git a/lib/auth/ldap.rb b/lib/auth/ldap.rb
index 99dcea5fe..f72426973 100644
--- a/lib/auth/ldap.rb
+++ b/lib/auth/ldap.rb
@@ -1,8 +1,8 @@
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
 require 'net/ldap'
 
-module Auth
-end
-module Auth::LDAP
+module Auth::Ldap
   def self.check( username, password, config, user )
 
     scope = Net::LDAP::SearchScope_WholeSubtree
diff --git a/lib/auth/otrs.rb b/lib/auth/otrs.rb
index a0ad88336..3219d86cb 100644
--- a/lib/auth/otrs.rb
+++ b/lib/auth/otrs.rb
@@ -1,7 +1,8 @@
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
 require 'import/otrs'
-module Auth
-end
-module Auth::OTRS
+
+module Auth::Otrs
   def self.check( username, password, config, user )
 
     endpoint = Setting.get('import_otrs_endpoint')
diff --git a/lib/auth/test.rb b/lib/auth/test.rb
index cf68a85be..a06a2f330 100644
--- a/lib/auth/test.rb
+++ b/lib/auth/test.rb
@@ -1,6 +1,6 @@
-module Auth
-end
-module Auth::TEST
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+module Auth::Test
   def self.check( username, password, config, user )
 
     # development systems
diff --git a/lib/sso.rb b/lib/sso.rb
new file mode 100644
index 000000000..4715723e9
--- /dev/null
+++ b/lib/sso.rb
@@ -0,0 +1,63 @@
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+class Sso < ApplicationLib
+
+=begin
+
+authenticate user via username and password
+
+  result = Sso.check( params, config_item )
+
+returns
+
+  result = user_model # if authentication was successfully
+
+=end
+
+  def self.check(params)
+
+    # use std. auth backends
+    config = [
+      {
+        :adapter => 'Sso::Env',
+      },
+      {
+        :adapter => 'Sso::Otrs',
+      },
+    ]
+
+    # added configured backends
+    Setting.where( :area => 'Security::SSO' ).each {|setting|
+      if setting.state[:value]
+        config.push setting.state[:value]
+      end
+    }
+
+    # try to login against configure auth backends
+    user_auth = nil
+    config.each {|config_item|
+      next if !config_item[:adapter]
+
+      # load backend
+      backend = self.load_adapter( config_item[:adapter] )
+      return if !backend
+
+      user_auth = backend.check( params, config_item )
+
+      # auth ok
+      if user_auth
+
+        # remember last login date
+        user_auth.update_last_login
+
+        # reset login failed
+        user_auth.login_failed = 0
+        user_auth.save
+
+        return user_auth
+      end
+    }
+    return
+
+  end
+end
diff --git a/lib/sso/env.rb b/lib/sso/env.rb
index 6904719e1..633658ced 100644
--- a/lib/sso/env.rb
+++ b/lib/sso/env.rb
@@ -1,6 +1,6 @@
-module SSO
-end
-module SSO::ENV
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+module Sso::Env
   def self.check( params, config_item )
 
     # try to find user based on login
diff --git a/lib/sso/otrs.rb b/lib/sso/otrs.rb
index 349ab47cf..660fa3e38 100644
--- a/lib/sso/otrs.rb
+++ b/lib/sso/otrs.rb
@@ -1,6 +1,6 @@
-module SSO
-end
-module SSO::OTRS
+# Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
+
+module Sso::Otrs
   def self.check( params, config_item )
 
     endpoint = Setting.get('import_otrs_endpoint')