1 files changed, 89 insertions, 0 deletions
diff --git a/lib/gitlab/auth/ldap/access.rb b/lib/gitlab/auth/ldap/access.rb
new file mode 100644
index 00000000000..77c0ddc2d48
--- /dev/null
+++ b/lib/gitlab/auth/ldap/access.rb
@@ -0,0 +1,89 @@
+# LDAP authorization model
+#
+# * Check if we are allowed access (not blocked)
+#
+module Gitlab
+  module Auth
+    module LDAP
+      class Access
+        attr_reader :provider, :user
+
+        def self.open(user, &block)
+          Gitlab::Auth::LDAP::Adapter.open(user.ldap_identity.provider) do |adapter|
+            block.call(self.new(user, adapter))
+          end
+        end
+
+        def self.allowed?(user)
+          self.open(user) do |access|
+            if access.allowed?
+              Users::UpdateService.new(user, user: user, last_credential_check_at: Time.now).execute
+
+              true
+            else
+              false
+            end
+          end
+        end
+
+        def initialize(user, adapter = nil)
+          @adapter = adapter
+          @user = user
+          @provider = user.ldap_identity.provider
+        end
+
+        def allowed?
+          if ldap_user
+            unless ldap_config.active_directory
+              unblock_user(user, 'is available again') if user.ldap_blocked?
+              return true
+            end
+
+            # Block user in GitLab if he/she was blocked in AD
+            if Gitlab::Auth::LDAP::Person.disabled_via_active_directory?(user.ldap_identity.extern_uid, adapter)
+              block_user(user, 'is disabled in Active Directory')
+              false
+            else
+              unblock_user(user, 'is not disabled anymore') if user.ldap_blocked?
+              true
+            end
+          else
+            # Block the user if they no longer exist in LDAP/AD
+            block_user(user, 'does not exist anymore')
+            false
+          end
+        end
+
+        def adapter
+          @adapter ||= Gitlab::Auth::LDAP::Adapter.new(provider)
+        end
+
+        def ldap_config
+          Gitlab::Auth::LDAP::Config.new(provider)
+        end
+
+        def ldap_user
+          @ldap_user ||= Gitlab::Auth::LDAP::Person.find_by_dn(user.ldap_identity.extern_uid, adapter)
+        end
+
+        def block_user(user, reason)
+          user.ldap_block
+
+          Gitlab::AppLogger.info(
+            "LDAP account \"#{user.ldap_identity.extern_uid}\" #{reason}, " \
+            "blocking Gitlab user \"#{user.name}\" (#{user.email})"
+          )
+        end
+
+        def unblock_user(user, reason)
+          user.activate
+
+          Gitlab::AppLogger.info(
+            "LDAP account \"#{user.ldap_identity.extern_uid}\" #{reason}, " \
+            "unblocking Gitlab user \"#{user.name}\" (#{user.email})"
+          )
+        end
+      end
+    end
+  end
+end