Fix OAuth, LDAP and SAML SSO when regular sign-ups are disabled

app/services/users/create_service.rb

@@ -6,8 +6,8 @@ module Users
       @params = params.dup
     end
 
-    def build
-      raise Gitlab::Access::AccessDeniedError unless can_create_user?
+    def build(skip_authorization: false)
+      raise Gitlab::Access::AccessDeniedError unless skip_authorization || can_create_user?
 
       user = User.new(build_user_params)
 
@@ -32,8 +32,8 @@ module Users
       user
     end
 
-    def execute
-      user = build
+    def execute(skip_authorization: false)
+      user = build(skip_authorization: skip_authorization)
 
       if user.save
         log_info("User \"#{user.name}\" (#{user.email}) was created")

changelogs/unreleased/dm-fix-oauth-user-creation.yml

+---
+title: Fix OAuth, LDAP and SAML SSO when regular sign-ups are disabled
+merge_request:
+author:

lib/gitlab/o_auth/user.rb

@@ -148,7 +148,7 @@ module Gitlab
 
       def build_new_user
         user_params = user_attributes.merge(extern_uid: auth_hash.uid, provider: auth_hash.provider, skip_confirmation: true)
-        Users::CreateService.new(nil, user_params).build
+        Users::CreateService.new(nil, user_params).build(skip_authorization: true)
       end
 
       def user_attributes

spec/lib/gitlab/ldap/user_spec.rb

@@ -108,6 +108,18 @@ describe Gitlab::LDAP::User, lib: true do
     it "creates a new user if not found" do
       expect{ ldap_user.save }.to change{ User.count }.by(1)
     end
+
+    context 'when signup is disabled' do
+      before do
+        stub_application_setting signup_enabled: false
+      end
+
+      it 'creates the user' do
+        ldap_user.save
+
+        expect(gl_user).to be_persisted
+      end
+    end
   end
 
   describe 'updating email' do

spec/lib/gitlab/o_auth/user_spec.rb

@@ -40,6 +40,20 @@ describe Gitlab::OAuth::User, lib: true do
     let(:provider) { 'twitter' }
 
     describe 'signup' do
+      context 'when signup is disabled' do
+        before do
+          stub_application_setting signup_enabled: false
+        end
+
+        it 'creates the user' do
+          stub_omniauth_config(allow_single_sign_on: ['twitter'])
+
+          oauth_user.save
+
+          expect(gl_user).to be_persisted
+        end
+      end
+
       it 'marks user as having password_automatically_set' do
         stub_omniauth_config(allow_single_sign_on: ['twitter'], external_providers: ['twitter'])
 

spec/lib/gitlab/saml/user_spec.rb

@@ -211,6 +211,18 @@ describe Gitlab::Saml::User, lib: true do
           end
         end
       end
+
+      context 'when signup is disabled' do
+        before do
+          stub_application_setting signup_enabled: false
+        end
+
+        it 'creates the user' do
+          saml_user.save
+
+          expect(gl_user).to be_persisted
+        end
+      end
     end
 
     describe 'blocking' do