pam authentication (#5303)

* add pam support, without extra column

* bugfixes for pam login

* document options

* fix code style

* fix codestyle

* fix tests

* don't call remember_me without password

* fix codestyle

* improve checks for pam usage (should fix tests)

* fix remember_me part 1

* add remember_token column because :rememberable requires either a password or this column.

* migrate db for remember_token

* move pam_authentication to the right place, fix logic bug in edit.html.haml

* fix tests

* fix pam authentication, improve username lookup, add comment

* valid? is sometimes not honored, return nil instead trying to authenticate with pam

* update devise_pam_authenticatable2 and adjust code. Fixes sideeffects observed in tests

* update devise_pam_authenticatable gem, fixes for codeconventions, fix finding user

* codeconvention fixes

* code convention fixes

* fix idention

* update dependency, explicit conflict check

* fix disabled password updates if in pam mode

* fix check password if password is present, fix templates

* block registration if account is maintained by pam

* Revert "block registration if account is maintained by pam"

This reverts commit 8e7a083d650240b6fac414926744b4b90b435f20.

* fix identation error introduced by rebase

* block usernames maintained by pam

* document pam settings better

* fix code style

3 files changed, 35 insertions, 1 deletions

diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index 07912c28b..f2f7f1ba3 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -30,6 +30,19 @@ Warden::Manager.before_logout do |_, warden|
   warden.cookies.delete('_session_id')
 end
 
+module Devise
+  mattr_accessor :pam_authentication
+  @@pam_authentication = false
+  mattr_accessor :pam_controlled_service
+  @@pam_controlled_service = nil
+
+  class Strategies::PamAuthenticatable
+    def valid?
+      super && ::Devise.pam_authentication
+    end
+  end
+end
+
 Devise.setup do |config|
   config.warden do |manager|
     manager.default_strategies(scope: :user).unshift :two_factor_authenticatable
@@ -96,7 +109,7 @@ Devise.setup do |config|
   # given strategies, for example, `config.http_authenticatable = [:database]` will
   # enable it only for database authentication. The supported strategies are:
   # :database      = Support basic authentication with authentication key + password
-  config.http_authenticatable = [:database]
+  config.http_authenticatable = [:pam, :database]
 
   # If 401 status code should be returned for AJAX requests. True by default.
   # config.http_authenticatable_on_xhr = true
@@ -301,4 +314,23 @@ Devise.setup do |config|
   # When using OmniAuth, Devise cannot automatically set OmniAuth path,
   # so you need to do it manually. For the users scope, it would be:
   # config.omniauth_path_prefix = '/my_engine/users/auth'
+
+  # PAM: only look for email field
+  config.usernamefield = nil
+  config.emailfield = "email"
+
+  # authentication with pam possible
+  # if not enabled, all pam settings are ignored
+  #config.pam_authentication = true
+  # check if email is actually a username
+  config.check_at_sign = true
+  # suffix for email address generation (warning: without pam must provide email in the pam environment)
+  config.pam_default_suffix = "pam"
+  # name of the pam service
+  # pam "auth" section is evaluated
+  config.pam_default_service = "rpam"
+  # name of the pam service used for checking if an user can register
+  # pam "account" section is evaluated
+  # nil for allowing registration of pam names (not recommended)
+  config.pam_controlled_service = "rpam"
 end
diff --git a/config/locales/simple_form.de.yml b/config/locales/simple_form.de.yml
index 3c5e467a2..bb78ae21a 100644
--- a/config/locales/simple_form.de.yml
+++ b/config/locales/simple_form.de.yml
@@ -53,6 +53,7 @@ de:
         severity: Gewichtung
         type: Importtyp
         username: Profilname
+        username_or_email: Profilname oder Email
       interactions:
         must_be_follower: Benachrichtigungen von Nicht-Folgenden blockieren
         must_be_following: Benachrichtigungen von Profilen blockieren, denen ich nicht folge
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 143daaa29..c56334d56 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -53,6 +53,7 @@ en:
         severity: Severity
         type: Import type
         username: Username
+        username_or_email: Username or Email
       interactions:
         must_be_follower: Block notifications from non-followers
         must_be_following: Block notifications from people you don't follow