diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a01ee28
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.*.swp
diff --git a/Group.rb b/Group.rb
new file mode 100644
index 0000000..e607420
--- /dev/null
+++ b/Group.rb
@@ -0,0 +1,14 @@
+require 'SystemData'
+
+class Group < SystemData
+  attr_accessor :name, :gid, :members
+  
+  def initialize(args = {})
+		super(args)
+
+    @name    = args[:name]
+    @gid     = args[:gid]
+    @members = args[:members]
+		@members = Array.new if @members.nil?
+  end
+end
diff --git a/MailAccount.rb b/MailAccount.rb
new file mode 100644
index 0000000..a6ec9fd
--- /dev/null
+++ b/MailAccount.rb
@@ -0,0 +1,17 @@
+require 'SystemData'
+
+class MailAccount < SystemData
+  attr_accessor :mail, :mailbox
+
+	def initialize(args = {})
+		super(args)
+
+		@mail     = args[:mail]
+		@home     = args[:home]
+		@mailbox  = args[:mailbox]
+	end
+
+	def site
+		@mail.sub(/.*@/, '')
+	end
+end
diff --git a/MailAlias.rb b/MailAlias.rb
new file mode 100644
index 0000000..b7f4c9c
--- /dev/null
+++ b/MailAlias.rb
@@ -0,0 +1,17 @@
+require 'SystemData'
+
+class MailAlias < SystemData
+  attr_accessor :mail, :maildrop, :user
+
+	def initialize(args = {})
+    super(args)
+
+		@mail     = args[:mail]
+		@maildrop = args[:maildrop]
+		@user     = args[:user]
+	end
+
+	def site
+		@mail.sub(/.*@/, '')
+	end
+end
diff --git a/Site.rb b/Site.rb
new file mode 100644
index 0000000..313166a
--- /dev/null
+++ b/Site.rb
@@ -0,0 +1,9 @@
+require 'SystemData'
+
+class Site < SystemData
+	attr_accessor :name, :mailAccounts, :mailAliases
+
+	def initialize(args = {})
+		@name = args[:name]
+	end
+end
diff --git a/SystemData.rb b/SystemData.rb
new file mode 100644
index 0000000..79fe4a4
--- /dev/null
+++ b/SystemData.rb
@@ -0,0 +1,16 @@
+class SystemData
+	attr_reader :id
+
+	def initialize(args = {})
+		@backend = args[:backend]
+		@id      = args[:id]
+	end
+
+	def save
+		if @id
+			@backend.update(self)
+		else
+			@backend.insert(self)
+		end
+	end
+end
diff --git a/SystemDataBackend.rb b/SystemDataBackend.rb
new file mode 100644
index 0000000..75df516
--- /dev/null
+++ b/SystemDataBackend.rb
@@ -0,0 +1,84 @@
+require 'User'
+require 'Group'
+require 'Site'
+require 'MailAlias'
+require 'MailAccount'
+
+class SystemDataBackend
+
+  def initialize(backend)
+    @backend = backend
+    @data    = Hash.new
+  end
+
+  def users
+    load(:user)
+  end
+
+  def groups
+    load(:group)
+  end
+
+  def sites
+    load(:site)
+  end
+
+  def mailAliases
+    load(:mailAlias)
+  end
+
+  def mailAccounts
+    load(:mailAccount)
+  end
+
+  def userByName(name)
+    users.find{|user| user.name == name}
+  end
+
+  def groupByName(name)
+    groups.find{|group| group.name == name}
+  end
+
+  def siteByName(name)
+    sites.find{|site| site.name == name}
+  end
+
+  def usersInGroup(group)
+    case
+    when group.members.instance_of?(Array):
+      Hash[group.members.map{|uid| [uid, userByName(uid)] if userByName(uid)}]
+    when goup.members.nil?:
+      {}
+    else
+      {group.members => userByName(group.members)} if userByName(group.members)
+    end
+  end
+
+  def mailAliasesBySite(site)
+    mailAliases.find_all{|mail| mail.site == site.name}
+  end
+
+  def mailAccountsBySite(site)
+    mailAccounts.find_all{|mail| mail.site == site.name}
+  end
+
+  private
+
+  def load(kind)
+    load!(kind) if ! @data[kind]
+    @data[kind]
+  end
+
+  def load!(kind)
+    @data[kind]  = Array.new
+    class_str    = kind.to_s
+    class_str[0] = class_str[0..0].capitalize
+
+    @backend.load(kind) do |data|
+      @data[kind].push(
+        eval(class_str + '.new(data)')
+      )
+    end
+  end
+
+end
diff --git a/SystemDataBackendLdap.rb b/SystemDataBackendLdap.rb
new file mode 100644
index 0000000..5b28818
--- /dev/null
+++ b/SystemDataBackendLdap.rb
@@ -0,0 +1,84 @@
+require 'active_support/secure_random'
+require 'net/ldap'
+
+class SystemDataBackendLdap
+
+  LDAP_USER_MAP = {
+    :uid           => :name,
+    :userpassword  => :pass,
+    :uidnumber     => :uid,
+    :gidnumber     => :gid,
+    :loginshell    => :shell,
+    :homedirectory => :home
+  }
+
+  LDAP_GROUP_MAP = {
+    :cn        => :name,
+    :gidnumber => :gid,
+    :memberuid => :members
+  }
+
+  LDAP_SITE_MAP = {:o => :name}
+
+  LDAP_MAP = {
+    :user      => LDAP_USER_MAP,
+    :group     => LDAP_GROUP_MAP,
+    :site      => LDAP_SITE_MAP
+  }
+
+  LDAP_FILTER = {
+    :user        => Net::LDAP::Filter::eq('objectClass', 'posixAccount'),
+    :group       => Net::LDAP::Filter::eq('objectClass', 'posixGroup'),
+    :site        => Net::LDAP::Filter::eq('objectClass', 'organization') &
+                    (~Net::LDAP::Filter::eq('o', 'hosting')),
+    :mailAlias   => Net::LDAP::Filter::eq('objectClass', 'mailAlias'),
+    :mailAccount => Net::LDAP::Filter::eq('objectClass', 'mailAccount')
+  }
+
+
+  def initialize(host, port, baseDn, args={})
+    @baseDn    = baseDn
+    @systemDn  = 'o=system,' + @baseDn
+    @hostingDn = 'o=hosting,' + @baseDn
+
+    @systemDn  = args[:systemDn] if args[:systemDn]
+    @hostingDn = args[:hostingDn] if args[:hostingDn]
+
+    @ldap      = Net::LDAP.new(:host => host, :port => port)
+    @ldapData  = Hash.new
+  end
+
+  def load!(kind)
+    @ldapData[kind] = @ldap.search(
+      :base   => ldapBase(kind),
+      :filter => LDAP_FILTER[kind]
+    )
+  end
+
+  def load(kind)
+    load!(kind) if ! @ldapData[kind]
+
+    @ldapData[kind].each do |data|
+      map = { :dn => :id }
+      map.merge!(LDAP_MAP[kind]) if LDAP_MAP[kind]
+
+      ydata = { :backend => self }
+
+      data.each do |key,value|
+        ydata.merge!({ map[key] || key => value.size==1?value[0]:value.to_a })
+      end
+
+      yield ydata
+    end
+  end
+
+  private
+
+  def ldapBase(kind)
+    case(kind)
+    when :user, :group: @systemDn
+    when :site, :mailAlias, :mailAccount: @hostingDn
+    end
+  end
+
+end
diff --git a/User.rb b/User.rb
new file mode 100644
index 0000000..68bb781
--- /dev/null
+++ b/User.rb
@@ -0,0 +1,16 @@
+require 'SystemData'
+
+class User < SystemData
+	attr_accessor :name, :pass, :uid, :gid, :shell, :home
+
+	def initialize(args = {})
+		super(args)
+
+		@name  = args[:name]
+		@pass  = args[:pass]
+		@uid   = args[:uid]
+		@gid   = args[:gid]
+		@shell = args[:shell]
+		@home  = args[:home]
+	end
+end
diff --git a/test_dummy.rb b/test_dummy.rb
new file mode 100644
index 0000000..963fa28
--- /dev/null
+++ b/test_dummy.rb
@@ -0,0 +1,46 @@
+require 'SystemDataBackend'
+require 'SystemDataBackendLdap'
+
+backend = SystemDataBackend.new(
+  SystemDataBackendLdap.new('host.one.virtual', 389, 'dc=weird-web-workers,dc=org')
+)
+
+backend.users.each do |user|
+  puts 'user: '+user.name+','+user.uid+','+user.gid+','+user.home
+end
+
+puts
+
+backend.groups.each do |group|
+	members = backend.usersInGroup(group)
+
+  puts 'group: '+group.name+','+group.gid
+	puts '  members:'
+  group.members.each do |name|
+    print '   ' + name + ': '
+		print members[name].uid + ', ' + members[name].home if members[name]
+		puts
+  end
+  puts
+end
+
+backend.sites.each do |site|
+  puts 'site: ' + site.name
+  puts '  MailAliases:'
+  backend.mailAliasesBySite(site).each{|account| puts '   ' + account.mail}
+  puts
+  puts '  MailAccounts:'
+  backend.mailAccountsBySite(site).each{|account| puts '   ' + account.mail}
+  puts
+end
+
+backend.mailAliases.each do |mailAlias|
+  puts 'mailAlias: '+mailAlias.mail.inspect+','+mailAlias.maildrop.inspect
+end
+
+puts
+
+backend.mailAccounts.each do |mailAccount|
+  puts 'mailAccount: '+mailAccount.mail.inspect+','+mailAccount.mailbox.inspect
+end
+