Merge branch 'fix/auth0-unsafe-login-10-6' into 'security-10-6'

[10.6] Fix GitLab Auth0 integration signs in the wrong user

See merge request gitlab/gitlabhq!2354

Gemfile

@@ -25,7 +25,7 @@ gem 'devise', '~> 4.2'
 gem 'doorkeeper', '~> 4.3'
 gem 'doorkeeper-openid_connect', '~> 1.3'
 gem 'omniauth', '~> 1.4.2'
-gem 'omniauth-auth0', '~> 1.4.1'
+gem 'omniauth-auth0', '~> 2.0.0'
 gem 'omniauth-azure-oauth2', '~> 0.0.9'
 gem 'omniauth-cas3', '~> 1.1.4'
 gem 'omniauth-facebook', '~> 4.0.0'

Gemfile.lock

@@ -527,8 +527,8 @@ GEM
     omniauth (1.4.3)
       hashie (>= 1.2, < 4)
       rack (>= 1.6.2, < 3)
-    omniauth-auth0 (1.4.1)
-      omniauth-oauth2 (~> 1.1)
+    omniauth-auth0 (2.0.0)
+      omniauth-oauth2 (~> 1.4)
     omniauth-authentiq (0.3.1)
       omniauth-oauth2 (~> 1.3, >= 1.3.1)
     omniauth-azure-oauth2 (0.0.9)
@@ -1105,7 +1105,7 @@ DEPENDENCIES
   oauth2 (~> 1.4)
   octokit (~> 4.8)
   omniauth (~> 1.4.2)
-  omniauth-auth0 (~> 1.4.1)
+  omniauth-auth0 (~> 2.0.0)
   omniauth-authentiq (~> 0.3.1)
   omniauth-azure-oauth2 (~> 0.0.9)
   omniauth-cas3 (~> 1.1.4)

app/controllers/omniauth_callbacks_controller.rb

@@ -95,6 +95,14 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     handle_omniauth
   end
 
+  def auth0
+    if oauth['uid'].blank?
+      fail_auth0_login
+    else
+      handle_omniauth
+    end
+  end
+
   private
 
   def handle_omniauth
@@ -170,6 +178,12 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     redirect_to new_user_session_path
   end
 
+  def fail_auth0_login
+    flash[:alert] = 'Wrong extern UID provided. Make sure Auth0 is configured correctly.'
+
+    redirect_to new_user_session_path
+  end
+
   def handle_disabled_provider
     label = Gitlab::Auth::OAuth::Provider.label_for(oauth['provider'])
     flash[:alert] = "Signing in using #{label} has been disabled"

changelogs/unreleased/fix-auth0-unsafe-login.yml

+---
+title: Fix GitLab Auth0 integration signing in the wrong user
+merge_request:
+author:
+type: security

changelogs/unreleased/remove-unnecessary-validate-project.yml

----
-title: 'Remove unecessary validate: true from belongs_to :project'
-merge_request:
-author:
-type: fixed

db/post_migrate/20180220150310_remove_empty_extern_uid_auth0_identities.rb

+class RemoveEmptyExternUidAuth0Identities < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  class Identity < ActiveRecord::Base
+    self.table_name = 'identities'
+    include EachBatch
+  end
+
+  def up
+    broken_auth0_identities.each_batch do |identity|
+      identity.delete_all
+    end
+  end
+
+  def broken_auth0_identities
+    Identity.where(provider: 'auth0', extern_uid: [nil, ''])
+  end
+
+  def down
+  end
+end

doc/integration/auth0.md

@@ -56,7 +56,8 @@ for initial settings.
           "name" => "auth0",
           "args" => { client_id: 'YOUR_AUTH0_CLIENT_ID',
                       client_secret: 'YOUR_AUTH0_CLIENT_SECRET',
-                      namespace: 'YOUR_AUTH0_DOMAIN'
+                      domain: 'YOUR_AUTH0_DOMAIN',
+                      scope: 'openid profile email'
                     }
         }
       ]
@@ -69,8 +70,8 @@ for initial settings.
           args: {
             client_id: 'YOUR_AUTH0_CLIENT_ID',
             client_secret: 'YOUR_AUTH0_CLIENT_SECRET',
-            namespace: 'YOUR_AUTH0_DOMAIN'
-            }
+            domain: 'YOUR_AUTH0_DOMAIN',
+            scope: 'openid profile email' }
         }
     ```
 

spec/controllers/omniauth_callbacks_controller_spec.rb

@@ -3,14 +3,17 @@ require 'spec_helper'
 describe OmniauthCallbacksController do
   include LoginHelpers
 
-  let(:user) { create(:omniauth_user, extern_uid: 'my-uid', provider: provider) }
-  let(:provider) { :github }
+  let(:user) { create(:omniauth_user, extern_uid: extern_uid, provider: provider) }
 
   before do
-    mock_auth_hash(provider.to_s, 'my-uid', user.email)
+    mock_auth_hash(provider.to_s, extern_uid, user.email)
     stub_omniauth_provider(provider, context: request)
   end
 
+  context 'github' do
+    let(:extern_uid) { 'my-uid' }
+    let(:provider) { :github }
+
     it 'allows sign in' do
       post provider
 
@@ -72,4 +75,18 @@ describe OmniauthCallbacksController do
         end
       end
     end
+  end
+
+  context 'auth0' do
+    let(:extern_uid) { '' }
+    let(:provider) { :auth0 }
+
+    it 'does not allow sign in without extern_uid' do
+      post 'auth0'
+
+      expect(request.env['warden']).not_to be_authenticated
+      expect(response.status).to eq(302)
+      expect(controller).to set_flash[:alert].to('Wrong extern UID provided. Make sure Auth0 is configured correctly.')
+    end
+  end
 end

spec/migrations/remove_empty_extern_uid_auth0_identities_spec.rb

+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180220150310_remove_empty_extern_uid_auth0_identities.rb')
+
+describe RemoveEmptyExternUidAuth0Identities, :migration do
+  let(:identities) { table(:identities) }
+
+  before do
+    identities.create(provider: 'auth0', extern_uid: '')
+    identities.create(provider: 'auth0', extern_uid: 'valid')
+    identities.create(provider: 'github', extern_uid: '')
+
+    migrate!
+  end
+
+  it 'leaves the correct auth0 identity' do
+    expect(identities.where(provider: 'auth0').pluck(:extern_uid)).to eq(['valid'])
+  end
+
+  it 'leaves the correct github identity' do
+    expect(identities.where(provider: 'github').count).to eq(1)
+  end
+end