1 files changed, 35 insertions, 0 deletions
diff --git a/lib/gitlab/auth/crowd/authentication.rb b/lib/gitlab/auth/crowd/authentication.rb
new file mode 100644
index 00000000000..7f3e980034e
--- /dev/null
+++ b/lib/gitlab/auth/crowd/authentication.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Auth
+    module Crowd
+      class Authentication < Gitlab::Auth::OAuth::Authentication
+        def login(login, password)
+          return unless Gitlab::Auth::OAuth::Provider.enabled?(@provider)
+          return unless login.present? && password.present?
+
+          user_info = user_info_from_authentication(login, password)
+          return unless user_info&.key?(:user)
+
+          Gitlab::Auth::OAuth::User.find_by_uid_and_provider(user_info[:user], provider)
+        end
+
+        private
+
+        def config
+          gitlab_crowd_config = Gitlab::Auth::OAuth::Provider.config_for(@provider)
+          raise "OmniAuth Crowd is not configured." unless gitlab_crowd_config && gitlab_crowd_config[:args]
+
+          OmniAuth::Strategies::Crowd::Configuration.new(
+            gitlab_crowd_config[:args].symbolize_keys)
+        end
+
+        def user_info_from_authentication(login, password)
+          validator = OmniAuth::Strategies::Crowd::CrowdValidator.new(
+            config, login, password, RequestContext.instance.client_ip, nil)
+          validator&.user_info&.symbolize_keys
+        end
+      end
+    end
+  end
+end