diff -Nur redmine-0.7.3/app/models/auth_source_ldap.rb redmine-0.7.3-patched/app/models/auth_source_ldap.rb
--- redmine-0.7.3/app/models/auth_source_ldap.rb	2008-07-06 13:17:46.000000000 +0200
+++ redmine-0.7.3-patched/app/models/auth_source_ldap.rb	2008-08-28 19:44:59.000000000 +0200
@@ -19,7 +19,7 @@
 require 'iconv'
 
 class AuthSourceLdap < AuthSource 
-  validates_presence_of :host, :port, :attr_login
+  validates_presence_of :host, :port, :filter, :attr_login
   validates_presence_of :attr_firstname, :attr_lastname, :attr_mail, :if => Proc.new { |a| a.onthefly_register? }
   
   def after_initialize
@@ -33,9 +33,13 @@
     ldap_con = initialize_ldap_con(self.account, self.account_password)
     login_filter = Net::LDAP::Filter.eq( self.attr_login, login ) 
     object_filter = Net::LDAP::Filter.eq( "objectClass", "*" ) 
+    
+    # add the user defined filter
+    custom_filter = Net::LDAP::Filter.construct( self.filter ) 
+
     dn = String.new
     ldap_con.search( :base => self.base_dn, 
-                     :filter => object_filter & login_filter, 
+                     :filter => object_filter & login_filter & custom_filter, 
                      # only ask for the DN if on-the-fly registration is disabled
                      :attributes=> (onthefly_register? ? ['dn', self.attr_firstname, self.attr_lastname, self.attr_mail] : ['dn'])) do |entry|
       dn = entry.dn
diff -Nur redmine-0.7.3/app/models/auth_source.rb redmine-0.7.3-patched/app/models/auth_source.rb
--- redmine-0.7.3/app/models/auth_source.rb	2008-07-06 13:17:46.000000000 +0200
+++ redmine-0.7.3-patched/app/models/auth_source.rb	2008-08-28 19:42:31.000000000 +0200
@@ -22,7 +22,7 @@
   validates_uniqueness_of :name
   validates_length_of :name, :host, :maximum => 60
   validates_length_of :account_password, :maximum => 60, :allow_nil => true
-  validates_length_of :account, :base_dn, :maximum => 255
+  validates_length_of :account, :base_dn, :filter, :maximum => 255
   validates_length_of :attr_login, :attr_firstname, :attr_lastname, :attr_mail, :maximum => 30
 
   def authenticate(login, password)
diff -Nur redmine-0.7.3/app/views/auth_sources/_form.rhtml redmine-0.7.3-patched/app/views/auth_sources/_form.rhtml
--- redmine-0.7.3/app/views/auth_sources/_form.rhtml	2008-07-06 13:17:46.000000000 +0200
+++ redmine-0.7.3-patched/app/views/auth_sources/_form.rhtml	2008-08-28 19:46:20.000000000 +0200
@@ -22,6 +22,10 @@
 
 <p><label for="auth_source_base_dn"><%=l(:field_base_dn)%> <span class="required">*</span></label>
 <%= text_field 'auth_source', 'base_dn', :size => 60 %></p>
+
+<p><label for="auth_source_filter"><%=l(:field_filter)%></label>
+<%= text_field 'auth_source', 'filter', :size => 60 %></p>
+
 </div>
 
 <div class="box">
diff -Nur redmine-0.7.3/db/migrate/001_setup.rb redmine-0.7.3-patched/db/migrate/001_setup.rb
--- redmine-0.7.3/db/migrate/001_setup.rb	2008-07-06 13:17:50.000000000 +0200
+++ redmine-0.7.3-patched/db/migrate/001_setup.rb	2008-08-28 19:47:06.000000000 +0200
@@ -42,6 +42,7 @@
       t.column "account", :string, :limit => 60
       t.column "account_password", :string, :limit => 60
       t.column "base_dn", :string, :limit => 255
+      t.column "filter", :string, :limit => 255
       t.column "attr_login", :string, :limit => 30
       t.column "attr_firstname", :string, :limit => 30
       t.column "attr_lastname", :string, :limit => 30
diff -Nur redmine-0.7.3/lang/en.yml redmine-0.7.3-patched/lang/en.yml
--- redmine-0.7.3/lang/en.yml	2008-07-06 13:17:48.000000000 +0200
+++ redmine-0.7.3-patched/lang/en.yml	2008-08-28 19:48:51.000000000 +0200
@@ -151,6 +151,7 @@
 field_port: Port
 field_account: Account
 field_base_dn: Base DN
+field_filter: Filter
 field_attr_login: Login attribute
 field_attr_firstname: Firstname attribute
 field_attr_lastname: Lastname attribute
diff -Nur redmine-0.7.3/lang/fr.yml redmine-0.7.3-patched/lang/fr.yml
--- redmine-0.7.3/lang/fr.yml	2008-07-06 13:17:48.000000000 +0200
+++ redmine-0.7.3-patched/lang/fr.yml	2008-08-28 19:48:01.000000000 +0200
@@ -151,6 +151,7 @@
 field_port: Port
 field_account: Compte
 field_base_dn: Base DN
+field_filter: Filtre
 field_attr_login: Attribut Identifiant
 field_attr_firstname: Attribut Prénom
 field_attr_lastname: Attribut Nom