Merge branch 'add-recaptcha-support' into 'master'

Add support for Google reCAPTCHA in user registration to prevent spammers

To do:

- [x] Failing reCAPTCHA test causes all the fields to be lost
- ~~[ ] Improve styling of reCAPTCHA box~~ (not possible)
- ~~[ ] Put settings in `application_settings` (?)~~

![image](/uploads/d38ca89820d3c0066fb8aeb645fd77f0/image.png)

![image](/uploads/6b050749963691b023d076682abcf736/image.png)

Page when you fail CAPTCHA:

![image](/uploads/bc4846f0a5144985bc41dfa75eeab4c1/image.png)


See merge request !2216

11 files changed, 121 insertions, 10 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 8135a5d5180..39545c4a15c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.4.0 (unreleased)
+  - Add support for Google reCAPTCHA in user registration to prevent spammers (Stan Hu)
   - Implement new UI for group page
   - Implement search inside emoji picker
   - Add API support for looking up a user by username (Stan Hu)
diff --git a/Gemfile b/Gemfile
index cdf8884da91..7c3a0ca016f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,6 +35,9 @@ gem 'omniauth-twitter',       '~> 1.2.0'
 gem 'omniauth_crowd'
 gem 'rack-oauth2',            '~> 1.2.1'
 
+# reCAPTCHA protection
+gem 'recaptcha', require: 'recaptcha/rails'
+
 # Two-factor authentication
 gem 'devise-two-factor', '~> 2.0.0'
 gem 'rqrcode-rails3', '~> 0.1.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 59051b9f36f..5e1529642e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -568,6 +568,8 @@ GEM
       trollop
     rdoc (3.12.2)
       json (~> 1.4)
+    recaptcha (1.0.2)
+      json
     redcarpet (3.3.3)
     redis (3.2.2)
     redis-actionpack (4.0.1)
@@ -930,6 +932,7 @@ DEPENDENCIES
   raphael-rails (~> 2.1.2)
   rblineprof
   rdoc (~> 3.6)
+  recaptcha
   redcarpet (~> 3.3.3)
   redis-namespace
   redis-rails (~> 4.0.0)
diff --git a/app/controllers/registrations_controller.rb b/app/controllers/registrations_controller.rb
index 3b3dc86cb68..ee1006dea49 100644
--- a/app/controllers/registrations_controller.rb
+++ b/app/controllers/registrations_controller.rb
@@ -1,10 +1,21 @@
 class RegistrationsController < Devise::RegistrationsController
   before_action :signup_enabled?
+  include Recaptcha::Verify
 
   def new
     redirect_to(new_user_session_path)
   end
 
+  def create
+    if !Gitlab.config.recaptcha.enabled || verify_recaptcha
+      super
+    else
+      flash[:alert] = "There was an error with the reCAPTCHA code below. Please re-enter the code."
+      flash.delete :recaptcha_error
+      render action: 'new'
+    end
+  end
+
   def destroy
     DeleteUserService.new(current_user).execute(current_user)
 
@@ -38,4 +49,16 @@ class RegistrationsController < Devise::RegistrationsController
   def sign_up_params
     params.require(:user).permit(:username, :email, :name, :password, :password_confirmation)
   end
+
+  def resource_name
+    :user
+  end
+
+  def resource
+    @resource ||= User.new(sign_up_params)
+  end
+
+  def devise_mapping
+    @devise_mapping ||= Devise.mappings[:user]
+  end
 end
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 1b60d3e27d0..da4b35d322b 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -1,5 +1,6 @@
 class SessionsController < Devise::SessionsController
   include AuthenticatesWithTwoFactor
+  include Recaptcha::ClientHelper
 
   prepend_before_action :authenticate_with_two_factor, only: [:create]
   prepend_before_action :store_redirect_path, only: [:new]
@@ -40,7 +41,7 @@ class SessionsController < Devise::SessionsController
       User.find(session[:otp_user_id])
     end
   end
-  
+
   def store_redirect_path
     redirect_path =
       if request.referer.present? && (params['redirect_to_referer'] == 'yes')
@@ -87,14 +88,14 @@ class SessionsController < Devise::SessionsController
     provider = Gitlab.config.omniauth.auto_sign_in_with_provider
     return unless provider.present?
 
-    # Auto sign in with an Omniauth provider only if the standard "you need to sign-in" alert is 
-    # registered or no alert at all. In case of another alert (such as a blocked user), it is safer  
+    # Auto sign in with an Omniauth provider only if the standard "you need to sign-in" alert is
+    # registered or no alert at all. In case of another alert (such as a blocked user), it is safer
     # to do nothing to prevent redirection loops with certain Omniauth providers.
     return unless flash[:alert].blank? || flash[:alert] == I18n.t('devise.failure.unauthenticated')
-    
+
     # Prevent alert from popping up on the first page shown after authentication.
-    flash[:alert] = nil 
-    
+    flash[:alert] = nil
+
     redirect_to user_omniauth_authorize_path(provider.to_sym)
   end
 
diff --git a/app/views/devise/shared/_signup_box.html.haml b/app/views/devise/shared/_signup_box.html.haml
index 9dc6aeffd59..49fab016bfa 100644
--- a/app/views/devise/shared/_signup_box.html.haml
+++ b/app/views/devise/shared/_signup_box.html.haml
@@ -6,17 +6,21 @@
     .login-heading
       %h3 Create an account
   .login-body
+    - user = params[:user].present? ? params[:user] : {}
     = form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f|
       .devise-errors
         = devise_error_messages!
       %div
-        = f.text_field :name, class: "form-control top", placeholder: "Name", required: true
+        = f.text_field :name, class: "form-control top", value: user[:name], placeholder: "Name", required: true
       %div
-        = f.text_field :username, class: "form-control middle", placeholder: "Username", required: true
+        = f.text_field :username, class: "form-control middle", value: user[:username], placeholder: "Username", required: true
       %div
-        = f.email_field :email, class: "form-control middle", placeholder: "Email", required: true
+        = f.email_field :email, class: "form-control middle", value: user[:email], placeholder: "Email", required: true
       .form-group.append-bottom-20#password-strength
-        = f.password_field :password, class: "form-control bottom", id: "user_password_sign_up", placeholder: "Password", required: true
+        = f.password_field :password, class: "form-control bottom", value: user[:password], id: "user_password_sign_up", placeholder: "Password", required: true
+      %div
+      - if Gitlab.config.recaptcha.enabled
+        = recaptcha_tags
       %div
         = f.submit "Sign up", class: "btn-create btn"
 
diff --git a/config/gitlab.yml.example b/config/gitlab.yml.example
index db68b5512b8..79fc7423b31 100644
--- a/config/gitlab.yml.example
+++ b/config/gitlab.yml.example
@@ -346,6 +346,12 @@ production: &base
     # cas3:
     #   session_duration: 28800
 
+  # reCAPTCHA settings. See: http://www.google.com/recaptcha
+  recaptcha:
+    enabled: false
+    public_key: 'YOUR_PUBLIC_KEY'
+    private_key: 'YOUR_PRIVATE_KEY'
+
   # Shared file storage settings
   shared:
     # path: /mnt/gitlab # Default: shared
diff --git a/config/initializers/1_settings.rb b/config/initializers/1_settings.rb
index 816cb0c02a9..fb7adc77284 100644
--- a/config/initializers/1_settings.rb
+++ b/config/initializers/1_settings.rb
@@ -131,6 +131,13 @@ Settings.omniauth.cas3['session_duration'] ||= 8.hours
 Settings.omniauth['session_tickets'] ||= Settingslogic.new({})
 Settings.omniauth.session_tickets['cas3'] = 'ticket'
 
+# ReCAPTCHA settings
+Settings['recaptcha'] ||= Settingslogic.new({})
+Settings.recaptcha['enabled'] = false if Settings.recaptcha['enabled'].nil?
+Settings.recaptcha['public_key'] ||= Settings.recaptcha['public_key']
+Settings.recaptcha['private_key'] ||= Settings.recaptcha['private_key']
+
+
 Settings['shared'] ||= Settingslogic.new({})
 Settings.shared['path'] = File.expand_path(Settings.shared['path'] || "shared", Rails.root)
 
diff --git a/config/initializers/recaptcha.rb b/config/initializers/recaptcha.rb
new file mode 100644
index 00000000000..7509e327ae1
--- /dev/null
+++ b/config/initializers/recaptcha.rb
@@ -0,0 +1,6 @@
+if Gitlab.config.recaptcha.enabled
+  Recaptcha.configure do |config|
+    config.public_key  = Gitlab.config.recaptcha['public_key']
+    config.private_key = Gitlab.config.recaptcha['private_key']
+  end
+end
diff --git a/doc/integration/README.md b/doc/integration/README.md
index 6263353851f..2a9f76533b7 100644
--- a/doc/integration/README.md
+++ b/doc/integration/README.md
@@ -13,6 +13,7 @@ See the documentation below for details on how to configure these services.
 - [Slack](slack.md) Integrate with the Slack chat service
 - [OAuth2 provider](oauth_provider.md) OAuth2 application creation
 - [Gmail actions buttons](gmail_action_buttons_for_gitlab.md) Adds GitLab actions to messages
+- [reCAPTCHA](recaptcha.md) Configure GitLab to use Google reCAPTCHA for new users
 
 GitLab Enterprise Edition contains [advanced JIRA support](http://doc.gitlab.com/ee/integration/jira.html) and [advanced Jenkins support](http://doc.gitlab.com/ee/integration/jenkins.html).
 
diff --git a/doc/integration/recaptcha.md b/doc/integration/recaptcha.md
new file mode 100644
index 00000000000..7e6f7e7e30a
--- /dev/null
+++ b/doc/integration/recaptcha.md
@@ -0,0 +1,56 @@
+# reCAPTCHA
+
+GitLab leverages [Google's reCAPTCHA](https://www.google.com/recaptcha/intro/index.html)
+to protect against spam and abuse. GitLab displays the CAPTCHA form on the sign-up page
+to confirm that a real user, not a bot, is attempting to create an account.
+
+## Configuration
+
+To use reCAPTCHA, first you must create a public and private key.
+
+1. Go to the URL: https://www.google.com/recaptcha/admin
+
+1. Fill out the form necessary to obtain reCAPTCHA keys.
+
+1. On your GitLab server, open the configuration file.
+
+    For omnibus package:
+
+    ```sh
+      sudo editor /etc/gitlab/gitlab.rb
+    ```
+
+    For installations from source:
+
+    ```sh
+      cd /home/git/gitlab
+
+      sudo -u git -H editor config/gitlab.yml
+    ```
+
+1.  Enable reCAPTCHA and add the settings:
+
+    For omnibus package:
+
+    ```ruby
+      gitlab_rails['recaptcha_enabled'] = true
+      gitlab_rails['recaptcha_public_key'] = 'YOUR_PUBLIC_KEY'
+      gitlab_rails['recaptcha_private_key'] = 'YOUR_PUBLIC_KEY'
+    ```
+
+    For installation from source:
+
+    ```
+      recaptcha:
+        enabled: true
+        public_key: 'YOUR_PUBLIC_KEY'
+        private_key: 'YOUR_PRIVATE_KEY'
+    ```
+
+1.  Change 'YOUR_PUBLIC_KEY' to the public key from step 2.
+
+1.  Change 'YOUR_PRIVATE_KEY' to the private key from step 2.
+
+1.  Save the configuration file.
+
+1.  Restart GitLab.