Fix #942: Seamless LDAP login (#6556)

config/application.rb

@@ -12,6 +12,7 @@ require_relative '../lib/paperclip/gif_transcoder'
 require_relative '../lib/paperclip/video_transcoder'
 require_relative '../lib/mastodon/snowflake'
 require_relative '../lib/mastodon/version'
+require_relative '../lib/devise/ldap_authenticatable'
 
 Dotenv::Railtie.load
 

config/initializers/devise.rb

@@ -36,6 +36,26 @@ module Devise
   mattr_accessor :pam_controlled_service
   @@pam_controlled_service = nil
 
+  mattr_accessor :check_at_sign
+  @@check_at_sign = false
+
+  mattr_accessor :ldap_authentication
+  @@ldap_authentication = false
+  mattr_accessor :ldap_host
+  @@ldap_host = nil
+  mattr_accessor :ldap_port
+  @@ldap_port = nil
+  mattr_accessor :ldap_method
+  @@ldap_method = nil
+  mattr_accessor :ldap_base
+  @@ldap_base = nil
+  mattr_accessor :ldap_uid
+  @@ldap_uid = nil
+  mattr_accessor :ldap_bind_dn
+  @@ldap_bind_dn = nil
+  mattr_accessor :ldap_password
+  @@ldap_password = nil
+
   class Strategies::PamAuthenticatable
     def valid?
       super && ::Devise.pam_authentication
@@ -45,6 +65,8 @@ end
 
 Devise.setup do |config|
   config.warden do |manager|
+    manager.default_strategies(scope: :user).unshift :ldap_authenticatable if Devise.ldap_authentication
+    manager.default_strategies(scope: :user).unshift :pam_authenticatable  if Devise.pam_authentication
     manager.default_strategies(scope: :user).unshift :two_factor_authenticatable
     manager.default_strategies(scope: :user).unshift :two_factor_backupable
   end
@@ -324,4 +346,16 @@ Devise.setup do |config|
     config.pam_default_service    = ENV.fetch('PAM_DEFAULT_SERVICE') { 'rpam' }
     config.pam_controlled_service = ENV.fetch('PAM_CONTROLLED_SERVICE') { 'rpam' }
   end
+
+  if ENV['LDAP_ENABLED'] == 'true'
+    config.ldap_authentication = true
+    config.check_at_sign       = true
+    config.ldap_host           = ENV.fetch('LDAP_HOST', 'localhost')
+    config.ldap_port           = ENV.fetch('LDAP_PORT', 389).to_i
+    config.ldap_method         = ENV.fetch('LDAP_METHOD', :simple_tls).to_sym
+    config.ldap_base           = ENV.fetch('LDAP_BASE')
+    config.ldap_bind_dn        = ENV.fetch('LDAP_BIND_DN')
+    config.ldap_password       = ENV.fetch('LDAP_PASSWORD')
+    config.ldap_uid            = ENV.fetch('LDAP_UID', 'cn')
+  end
 end

config/locales/en.yml

@@ -769,4 +769,5 @@ en:
   users:
     invalid_email: The e-mail address is invalid
     invalid_otp_token: Invalid two-factor code
+    seamless_external_login: You are logged in via an external service, so password and e-mail settings are not available.
     signed_in_as: 'Signed in as:'