Allow `external_providers` for Omniauth to be defined to mark these users as external

config/initializers/1_settings.rb

@@ -129,6 +129,7 @@ Settings['omniauth'] ||= Settingslogic.new({})
 Settings.omniauth['enabled']      = false if Settings.omniauth['enabled'].nil?
 Settings.omniauth['auto_sign_in_with_provider'] = false if Settings.omniauth['auto_sign_in_with_provider'].nil?
 Settings.omniauth['allow_single_sign_on'] = false if Settings.omniauth['allow_single_sign_on'].nil?
+Settings.omniauth['external_providers'] = [] if Settings.omniauth['external_providers'].nil?
 Settings.omniauth['block_auto_created_users'] = true if Settings.omniauth['block_auto_created_users'].nil?
 Settings.omniauth['auto_link_ldap_user'] = false if Settings.omniauth['auto_link_ldap_user'].nil?
 Settings.omniauth['auto_link_saml_user'] = false if Settings.omniauth['auto_link_saml_user'].nil?

lib/gitlab/o_auth/user.rb

@@ -54,6 +54,14 @@ module Gitlab
           @user ||= build_new_user
         end
 
+        unless @user.nil?
+          if external_provider?
+            @user.external = true
+          else
+            @user.external = false
+          end
+        end
+
         @user
       end
 
@@ -113,6 +121,10 @@ module Gitlab
         end
       end
 
+      def external_provider?
+        Gitlab.config.omniauth.external_providers.include?(auth_hash.provider)
+      end
+
       def block_after_signup?
         if creating_linked_ldap_user?
           ldap_config.block_auto_created_users