Merge branch 'allow-disabling-of-git-access-protocol' into 'master'

Add setting that allows admins to choose which Git access protocols are enabled.

## What does this MR do?

It allows admins to disable one of the two protocols for Git access. They can choose to enable just SSH, HTTP or allow both. If one of them is disabled, the clone URL in the project will show only the allowed protocol, and no dropdown to change protocols will be presented.

## What are the relevant issue numbers?

Full implementation on GitLab's side for #18601 

GitLab Shell implementation: gitlab-org/gitlab-shell!62

GitLab Workhorse implementation: gitlab-org/gitlab-workhorse!51

## Screenshots (if relevant)

![Screen_Shot_2016-06-16_at_12.26.19_PM](/uploads/bad845142e9704a7385b2eaca51fd4eb/Screen_Shot_2016-06-16_at_12.26.19_PM.png)
![Screen_Shot_2016-06-20_at_4.24.54_PM](/uploads/6e452dd269e06f0be23841ce93866ed6/Screen_Shot_2016-06-20_at_4.24.54_PM.png)



/cc @jschatz1  this MR touches the UI. Please review.

See merge request !4696

CHANGELOG

@@ -23,6 +23,7 @@ v 8.10.0 (unreleased)
   - Add notification settings dropdown for groups
   - Allow importing from Github using Personal Access Tokens. (Eric K Idema)
   - API: Todos !3188 (Robert Schilling)
+  - Add "Enabled Git access protocols" to Application Settings
   - Fix user creation with stronger minimum password requirements !4054 (nathan-pmt)
   - PipelinesFinder uses git cache data
   - Check for conflicts with existing Project's wiki path when creating a new project.

app/assets/stylesheets/framework/buttons.scss

@@ -281,3 +281,21 @@
     color: $gl-icon-color;
   }
 }
+
+.clone-dropdown-btn a {
+  color: $dropdown-link-color;
+  &:hover {
+    text-decoration: none;
+  }
+}
+
+.btn-static {
+  background-color: $background-color !important;
+  border: 1px solid lightgrey;
+  cursor: default;
+  &:active {
+    -moz-box-shadow: inset 0 0 0 white;
+    -webkit-box-shadow: inset 0 0 0 white;
+    box-shadow: inset 0 0 0 white;
+  }
+}

app/controllers/admin/application_settings_controller.rb

@@ -110,6 +110,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :send_user_confirmation_email,
       :container_registry_token_expire_delay,
       :repository_storage,
+      :enabled_git_access_protocol,
       restricted_visibility_levels: [],
       import_sources: [],
       disabled_oauth_sign_in_sources: []

app/controllers/projects/git_http_controller.rb

@@ -19,6 +19,8 @@ class Projects::GitHttpController < Projects::ApplicationController
       render_ok
     elsif receive_pack? && receive_pack_allowed?
       render_ok
+    elsif http_blocked?
+      render_not_allowed
     else
       render_not_found
     end
@@ -154,6 +156,10 @@ class Projects::GitHttpController < Projects::ApplicationController
     render plain: 'Not Found', status: :not_found
   end
 
+  def render_not_allowed
+    render plain: download_access.message, status: :forbidden
+  end
+
   def ci?
     @ci.present?
   end
@@ -162,12 +168,28 @@ class Projects::GitHttpController < Projects::ApplicationController
     return false unless Gitlab.config.gitlab_shell.upload_pack
 
     if user
-      Gitlab::GitAccess.new(user, project).download_access_check.allowed?
+      download_access.allowed?
     else
       ci? || project.public?
     end
   end
 
+  def access
+    return @access if defined?(@access)
+
+    @access = Gitlab::GitAccess.new(user, project, 'http')
+  end
+
+  def download_access
+    return @download_access if defined?(@download_access)
+
+    @download_access = access.check('git-upload-pack')
+  end
+
+  def http_blocked?
+    !access.protocol_allowed?
+  end
+
   def receive_pack_allowed?
     return false unless Gitlab.config.gitlab_shell.receive_pack
 

app/helpers/application_settings_helper.rb

@@ -31,6 +31,28 @@ module ApplicationSettingsHelper
     current_application_settings.akismet_enabled?
   end
 
+  def allowed_protocols_present?
+    current_application_settings.enabled_git_access_protocol.present?
+  end
+
+  def enabled_protocol
+    case current_application_settings.enabled_git_access_protocol
+    when 'http'
+      gitlab_config.protocol
+    when 'ssh'
+      'ssh'
+    end
+  end
+
+  def enabled_project_button(project, protocol)
+    case protocol
+    when 'ssh'
+      ssh_clone_button(project, 'bottom', append_link: false)
+    else
+      http_clone_button(project, 'bottom', append_link: false)
+    end
+  end
+
   # Return a group of checkboxes that use Bootstrap's button plugin for a
   # toggle button effect.
   def restricted_level_checkboxes(help_block_id)

app/helpers/branches_helper.rb

@@ -12,7 +12,7 @@ module BranchesHelper
   def can_push_branch?(project, branch_name)
     return false unless project.repository.branch_exists?(branch_name)
 
-    ::Gitlab::GitAccess.new(current_user, project).can_push_to_branch?(branch_name)
+    ::Gitlab::GitAccess.new(current_user, project, 'web').can_push_to_branch?(branch_name)
   end
 
   def project_branches

app/helpers/button_helper.rb

@@ -40,33 +40,33 @@ module ButtonHelper
       type: :button
   end
 
-  def http_clone_button(project)
+  def http_clone_button(project, placement = 'right', append_link: true)
     klass = 'http-selector'
     klass << ' has-tooltip' if current_user.try(:require_password?)
 
     protocol = gitlab_config.protocol.upcase
 
-    content_tag :a, protocol,
+    content_tag (append_link ? :a : :span), protocol,
       class: klass,
-      href: project.http_url_to_repo,
+      href: (project.http_url_to_repo if append_link),
       data: {
         html: true,
-        placement: 'right',
+        placement: placement,
         container: 'body',
         title: "Set a password on your account<br>to pull or push via #{protocol}"
       }
   end
 
-  def ssh_clone_button(project)
+  def ssh_clone_button(project, placement = 'right', append_link: true)
     klass = 'ssh-selector'
     klass << ' has-tooltip' if current_user.try(:require_ssh_key?)
 
-    content_tag :a, 'SSH',
+    content_tag (append_link ? :a : :span), 'SSH',
       class: klass,
-      href: project.ssh_url_to_repo,
+      href: (project.ssh_url_to_repo if append_link),
       data: {
         html: true,
-        placement: 'right',
+        placement: placement,
         container: 'body',
         title: 'Add an SSH key to your profile<br>to pull or push via SSH.'
       }

app/helpers/projects_helper.rb

@@ -206,10 +206,14 @@ module ProjectsHelper
   end
 
   def default_clone_protocol
+    if allowed_protocols_present?
+      enabled_protocol
+    else
       if !current_user || current_user.require_ssh_key?
         gitlab_config.protocol
       else
-      "ssh"
+        'ssh'
+      end
     end
   end
 

app/models/application_setting.rb

@@ -59,6 +59,9 @@ class ApplicationSetting < ActiveRecord::Base
     presence: true,
     inclusion: { in: ->(_object) { Gitlab.config.repositories.storages.keys } }
 
+  validates :enabled_git_access_protocol,
+            inclusion: { in: %w(ssh http), allow_blank: true, allow_nil: true }
+
   validates_each :restricted_visibility_levels do |record, attr, value|
     unless value.nil?
       value.each do |level|

app/models/merge_request.rb

@@ -481,7 +481,7 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def can_be_merged_by?(user)
-    ::Gitlab::GitAccess.new(user, project).can_push_to_branch?(target_branch)
+    ::Gitlab::GitAccess.new(user, project, 'web').can_push_to_branch?(target_branch)
   end
 
   def mergeable_ci_state?

app/services/commits/change_service.rb

@@ -23,7 +23,7 @@ module Commits
     private
 
     def check_push_permissions
-      allowed = ::Gitlab::GitAccess.new(current_user, project).can_push_to_branch?(@target_branch)
+      allowed = ::Gitlab::GitAccess.new(current_user, project, 'web').can_push_to_branch?(@target_branch)
 
       unless allowed
         raise ValidationError.new('You are not allowed to push into this branch')

app/services/files/base_service.rb

@@ -43,7 +43,7 @@ module Files
     end
 
     def validate
-      allowed = ::Gitlab::GitAccess.new(current_user, project).can_push_to_branch?(@target_branch)
+      allowed = ::Gitlab::GitAccess.new(current_user, project, 'web').can_push_to_branch?(@target_branch)
 
       unless allowed
         raise_error("You are not allowed to push into this branch")

app/views/admin/application_settings/_form.html.haml

@@ -43,6 +43,12 @@
           = link_to "(?)", help_page_path("integration", "bitbucket")
           and GitLab.com
           = link_to "(?)", help_page_path("integration", "gitlab")
+    .form-group
+      %label.control-label.col-sm-2 Enabled Git access protocols
+      .col-sm-10
+        = select(:application_setting, :enabled_git_access_protocol, [['Both SSH and HTTP(S)', nil], ['Only SSH', 'ssh'], ['Only HTTP(S)', 'http']], {}, class: 'form-control')
+        %span.help-block#clone-protocol-help
+          Allow only the selected protocols to be used for Git access.
     .form-group
       .col-sm-offset-2.col-sm-10
         .checkbox

app/views/shared/_clone_panel.html.haml

@@ -2,7 +2,12 @@
 
 .git-clone-holder.input-group
   .input-group-btn
-    %a#clone-dropdown.clone-dropdown-btn.btn{href: '#', 'data-toggle' => 'dropdown'}
+    -if allowed_protocols_present?
+      .clone-dropdown-btn.btn.btn-static
+        %span
+          = enabled_project_button(project, enabled_protocol)
+    - else
+      %a#clone-dropdown.clone-dropdown-btn.btn{href: '#', data: { toggle: 'dropdown' }}
         %span
           = default_clone_protocol.upcase
         = icon('caret-down')

db/migrate/20160615173316_add_enabled_git_access_protocols_to_application_settings.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+# rubocop:disable all
+
+class AddEnabledGitAccessProtocolsToApplicationSettings < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  def change
+    add_column :application_settings, :enabled_git_access_protocol, :string
+  end
+end

db/schema.rb

@@ -86,6 +86,7 @@ ActiveRecord::Schema.define(version: 20160705163108) do
     t.integer  "container_registry_token_expire_delay", default: 5
     t.text     "after_sign_up_text"
     t.string   "repository_storage",                    default: "default"
+    t.string   "enabled_git_access_protocol"
   end
 
   create_table "audit_events", force: :cascade do |t|

doc/README.md

@@ -21,6 +21,7 @@
 
 ## Administrator documentation
 
+- [Access restrictions](administration/access_restrictions.md) Define which Git access protocols can be used to talk to GitLab
 - [Authentication/Authorization](administration/auth/README.md) Configure
   external authentication with LDAP, SAML, CAS and additional Omniauth providers.
 - [Custom Git hooks](administration/custom_hooks.md) Custom Git hooks (on the filesystem) for when webhooks aren't enough.

doc/administration/access_restrictions.md

+# Access Restrictions
+
+> **Note:** This feature is only available on versions 8.10 and above.
+
+With GitLab's Access restrictions you can choose which Git access protocols you
+want your users to use to communicate with GitLab. This feature can be enabled
+via the `Application Settings` in the Admin interface.
+
+The setting is called `Enabled Git access protocols`, and it gives you the option
+to choose between:
+
+- Both SSH and HTTP(S)
+- Only SSH
+- Only HTTP(s)
+
+![Settings Overview](img/access_restrictions.png)
+
+## Enabled Protocol
+
+When both SSH and HTTP(S) are enabled, GitLab will behave as usual, it will give
+your users the option to choose which protocol they would like to use.
+
+When you choose to allow only one of the protocols, a couple of things will happen:
+
+- The project page will only show the allowed protocol's URL, with no option to
+  change it.
+- A tooltip will be shown when you hover over the URL's protocol, if an action
+  on the user's part is required, e.g. adding an SSH key, or setting a password.
+
+![Project URL with SSH only access](img/restricted_url.png)
+
+On top of these UI restrictions, GitLab will deny all Git actions on the protocol
+not selected.
+
+> **Note:** Please keep in mind that disabling an access protocol does not actually
+  block access to the server itself. The ports used for the protocol, be it SSH or
+  HTTP, will still be accessible. What GitLab does is restrict access on the
+  application level.
\ No newline at end of file

doc/api/settings.md

@@ -68,6 +68,7 @@ PUT /application/settings
 | `after_sign_out_path` | string | no | Where to redirect users after logout |
 | `container_registry_token_expire_delay` | integer | no | Container Registry token duration in minutes |
 | `repository_storage` | string | no | Storage path for new projects. The value should be the name of one of the repository storage paths defined in your gitlab.yml |
+| `enabled_git_access_protocol` | string | no | Enabled protocols for Git access. Allowed values are: `ssh`, `http`, and `nil` to allow both protocols.
 
 ```bash
 curl -X PUT -H "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/application/settings?signup_enabled=false&default_project_visibility=1

lib/api/internal.rb

@@ -13,6 +13,7 @@ module API
       #   action - git action (git-upload-pack or git-receive-pack)
       #   ref - branch name
       #   forced_push - forced_push
+      #   protocol - Git access protocol being used, e.g. HTTP or SSH
       #
 
       helpers do
@@ -46,11 +47,13 @@ module API
             User.find_by(id: params[:user_id])
           end
 
+        protocol = params[:protocol]
+
         access =
           if wiki?
-            Gitlab::GitAccessWiki.new(actor, project)
+            Gitlab::GitAccessWiki.new(actor, project, protocol)
           else
-            Gitlab::GitAccess.new(actor, project)
+            Gitlab::GitAccess.new(actor, project, protocol)
           end
 
         access_status = access.check(params[:action], params[:changes])

lib/gitlab/git/hook.rb

 module Gitlab
   module Git
     class Hook
+      GL_PROTOCOL = 'web'.freeze
       attr_reader :name, :repo_path, :path
 
       def initialize(name, repo_path)
@@ -34,7 +35,8 @@ module Gitlab
 
         vars = {
           'GL_ID' => gl_id,
-          'PWD' => repo_path
+          'PWD' => repo_path,
+          'GL_PROTOCOL' => GL_PROTOCOL
         }
 
         options = {

lib/gitlab/git_access.rb

@@ -3,11 +3,12 @@ module Gitlab
     DOWNLOAD_COMMANDS = %w{ git-upload-pack git-upload-archive }
     PUSH_COMMANDS = %w{ git-receive-pack }
 
-    attr_reader :actor, :project
+    attr_reader :actor, :project, :protocol
 
-    def initialize(actor, project)
+    def initialize(actor, project, protocol)
       @actor    = actor
       @project  = project
+      @protocol = protocol
     end
 
     def user
@@ -49,6 +50,8 @@ module Gitlab
     end
 
     def check(cmd, changes = nil)
+      return build_status_object(false, "Git access over #{protocol.upcase} is not allowed") unless protocol_allowed?
+
       unless actor
         return build_status_object(false, "No user or key was provided.")
       end
@@ -164,6 +167,10 @@ module Gitlab
       Gitlab::ForcePushCheck.force_push?(project, oldrev, newrev)
     end
 
+    def protocol_allowed?
+      Gitlab::ProtocolAccess.allowed?(protocol)
+    end
+
     private
 
     def protected_branch_action(oldrev, newrev, branch_name)

lib/gitlab/protocol_access.rb

+module Gitlab
+  module ProtocolAccess
+    def self.allowed?(protocol)
+      if protocol == 'web'
+        true
+      elsif current_application_settings.enabled_git_access_protocol.blank?
+        true
+      else
+        protocol == current_application_settings.enabled_git_access_protocol
+      end
+    end
+  end
+end

spec/features/admin/admin_disables_git_access_protocol_spec.rb

+require 'rails_helper'
+
+feature 'Admin disables Git access protocol', feature: true do
+  let(:project) { create(:empty_project, :empty_repo) }
+  let(:admin) { create(:admin) }
+
+  background do
+    login_as(admin)
+  end
+
+  context 'with HTTP disabled' do
+    background do
+      disable_http_protocol
+    end
+
+    scenario 'shows only SSH url' do
+      visit_project
+
+      expect(page).to have_content("git clone #{project.ssh_url_to_repo}")
+      expect(page).not_to have_selector('#clone-dropdown')
+    end
+  end
+
+  context 'with SSH disabled' do
+    background do
+      disable_ssh_protocol
+    end
+
+    scenario 'shows only HTTP url' do
+      visit_project
+
+      expect(page).to have_content("git clone #{project.http_url_to_repo}")
+      expect(page).not_to have_selector('#clone-dropdown')
+    end
+  end
+
+  context 'with nothing disabled' do
+    background do
+      create(:personal_key, user: admin)
+    end
+
+    scenario 'shows default SSH url and protocol selection dropdown' do
+      visit_project
+
+      expect(page).to have_content("git clone #{project.ssh_url_to_repo}")
+      expect(page).to have_selector('#clone-dropdown')
+    end
+
+  end
+
+  def visit_project
+    visit namespace_project_path(project.namespace, project)
+  end
+
+  def disable_http_protocol
+    visit admin_application_settings_path
+    find('#application_setting_enabled_git_access_protocol').find(:xpath, 'option[2]').select_option
+    click_on 'Save'
+  end
+
+  def disable_ssh_protocol
+    visit admin_application_settings_path
+    find('#application_setting_enabled_git_access_protocol').find(:xpath, 'option[3]').select_option
+    click_on 'Save'
+  end
+end

spec/lib/gitlab/git_access_spec.rb

 require 'spec_helper'
 
 describe Gitlab::GitAccess, lib: true do
-  let(:access) { Gitlab::GitAccess.new(actor, project) }
+  let(:access) { Gitlab::GitAccess.new(actor, project, 'web') }
   let(:project) { create(:project) }
   let(:user) { create(:user) }
   let(:actor) { user }
@@ -67,6 +67,43 @@ describe Gitlab::GitAccess, lib: true do
     end
   end
 
+  describe '#check with single protocols allowed' do
+    def disable_protocol(protocol)
+      settings = ::ApplicationSetting.create_from_defaults
+      settings.update_attribute(:enabled_git_access_protocol, protocol)
+    end
+
+    context 'ssh disabled' do
+      before do
+        disable_protocol('ssh')
+        @acc = Gitlab::GitAccess.new(actor, project, 'ssh')
+      end
+
+      it 'blocks ssh git push' do
+        expect(@acc.check('git-receive-pack').allowed?).to be_falsey
+      end
+
+      it 'blocks ssh git pull' do
+        expect(@acc.check('git-upload-pack').allowed?).to be_falsey
+      end
+    end
+
+    context 'http disabled' do
+      before do
+        disable_protocol('http')
+        @acc = Gitlab::GitAccess.new(actor, project, 'http')
+      end
+
+      it 'blocks http push' do
+        expect(@acc.check('git-receive-pack').allowed?).to be_falsey
+      end
+
+      it 'blocks http git pull' do
+        expect(@acc.check('git-upload-pack').allowed?).to be_falsey
+      end
+    end
+  end
+
   describe 'download_access_check' do
     describe 'master permissions' do
       before { project.team << [user, :master] }

spec/lib/gitlab/git_access_wiki_spec.rb

 require 'spec_helper'
 
 describe Gitlab::GitAccessWiki, lib: true do
-  let(:access) { Gitlab::GitAccessWiki.new(user, project) }
+  let(:access) { Gitlab::GitAccessWiki.new(user, project, 'web') }
   let(:project) { create(:project) }
   let(:user) { create(:user) }
 

spec/requests/api/internal_spec.rb

@@ -207,26 +207,86 @@ describe API::API, api: true  do
         expect(json_response["status"]).to be_falsey
       end
     end
+
+    context 'ssh access has been disabled' do
+      before do
+        settings = ::ApplicationSetting.create_from_defaults
+        settings.update_attribute(:enabled_git_access_protocol, 'http')
+      end
+
+      it 'rejects the SSH push' do
+        push(key, project)
+
+        expect(response.status).to eq(200)
+        expect(json_response['status']).to be_falsey
+        expect(json_response['message']).to eq 'Git access over SSH is not allowed'
+      end
+
+      it 'rejects the SSH pull' do
+        pull(key, project)
+
+        expect(response.status).to eq(200)
+        expect(json_response['status']).to be_falsey
+        expect(json_response['message']).to eq 'Git access over SSH is not allowed'
+      end
+    end
+
+    context 'http access has been disabled' do
+      before do
+        settings = ::ApplicationSetting.create_from_defaults
+        settings.update_attribute(:enabled_git_access_protocol, 'ssh')
+      end
+
+      it 'rejects the HTTP push' do
+        push(key, project, 'http')
+
+        expect(response.status).to eq(200)
+        expect(json_response['status']).to be_falsey
+        expect(json_response['message']).to eq 'Git access over HTTP is not allowed'
+      end
+
+      it 'rejects the HTTP pull' do
+        pull(key, project, 'http')
+
+        expect(response.status).to eq(200)
+        expect(json_response['status']).to be_falsey
+        expect(json_response['message']).to eq 'Git access over HTTP is not allowed'
+      end
+    end
+
+    context 'web actions are always allowed' do
+      it 'allows WEB push' do
+        settings = ::ApplicationSetting.create_from_defaults
+        settings.update_attribute(:enabled_git_access_protocol, 'ssh')
+        project.team << [user, :developer]
+        push(key, project, 'web')
+
+        expect(response.status).to eq(200)
+        expect(json_response['status']).to be_truthy
+      end
+    end
   end
 
-  def pull(key, project)
+  def pull(key, project, protocol = 'ssh')
     post(
       api("/internal/allowed"),
       key_id: key.id,
       project: project.path_with_namespace,
       action: 'git-upload-pack',
-      secret_token: secret_token
+      secret_token: secret_token,
+      protocol: protocol
     )
   end
 
-  def push(key, project)
+  def push(key, project, protocol = 'ssh')
     post(
       api("/internal/allowed"),
       changes: 'd14d6c0abdd253381df51a723d58691b2ee1ab08 570e7b2abdd848b95f2f578043fc23bd6f6fd24d refs/heads/master',
       key_id: key.id,
       project: project.path_with_namespace,
       action: 'git-receive-pack',
-      secret_token: secret_token
+      secret_token: secret_token,
+      protocol: protocol
     )
   end
 
@@ -237,7 +297,8 @@ describe API::API, api: true  do
       key_id: key.id,
       project: project.path_with_namespace,
       action: 'git-upload-archive',
-      secret_token: secret_token
+      secret_token: secret_token,
+      protocol: 'ssh'
     )
   end
 end