Add validation to webhook and service URLs to ensure they are not blocked because of SSRF

app/assets/javascripts/integrations/integration_settings_form.js

@@ -101,13 +101,19 @@ export default class IntegrationSettingsForm {
     return axios.put(this.testEndPoint, formData)
       .then(({ data }) => {
         if (data.error) {
-          flash(`${data.message} ${data.service_response}`, 'alert', document, {
+          let flashActions;
+
+          if (data.test_failed) {
+            flashActions = {
               title: 'Save anyway',
               clickHandler: (e) => {
                 e.preventDefault();
                 this.$form.submit();
               },
-          });
+            };
+          }
+
+          flash(`${data.message} ${data.service_response}`, 'alert', document, flashActions);
         } else {
           this.$form.submit();
         }

app/controllers/projects/services_controller.rb

@@ -41,13 +41,13 @@ class Projects::ServicesController < Projects::ApplicationController
       if outcome[:success]
         {}
       else
-        { error: true, message: 'Test failed.', service_response: outcome[:result].to_s }
+        { error: true, message: 'Test failed.', service_response: outcome[:result].to_s, test_failed: true }
       end
     else
-      { error: true, message: 'Validations failed.', service_response: @service.errors.full_messages.join(',') }
+      { error: true, message: 'Validations failed.', service_response: @service.errors.full_messages.join(','), test_failed: false }
     end
   rescue Gitlab::HTTP::BlockedUrlError => e
-    { error: true, message: 'Test failed.', service_response: e.message }
+    { error: true, message: 'Test failed.', service_response: e.message, test_failed: true }
   end
 
   def success_message

app/models/badge.rb

@@ -18,7 +18,7 @@ class Badge < ActiveRecord::Base
 
   scope :order_created_at_asc, -> { reorder(created_at: :asc) }
 
-  validates :link_url, :image_url, url_placeholder: { protocols: %w(http https), placeholder_regex: PLACEHOLDERS_REGEX }
+  validates :link_url, :image_url, url: { protocols: %w(http https) }
   validates :type, presence: true
 
   def rendered_link_url(project = nil)

app/models/environment.rb

@@ -32,7 +32,7 @@ class Environment < ActiveRecord::Base
   validates :external_url,
             length: { maximum: 255 },
             allow_nil: true,
-            addressable_url: true
+            url: true
 
   delegate :stop_action, :manual_actions, to: :last_deployment, allow_nil: true
 

app/models/generic_commit_status.rb

 class GenericCommitStatus < CommitStatus
   before_validation :set_default_values
 
-  validates :target_url, addressable_url: true,
+  validates :target_url, url: true,
                          length: { maximum: 255 },
                          allow_nil: true
 

app/models/hooks/system_hook.rb

@@ -11,4 +11,9 @@ class SystemHook < WebHook
   default_value_for :push_events, false
   default_value_for :repository_update_events, true
   default_value_for :merge_requests_events, false
+
+  # Allow urls pointing localhost and the local network
+  def allow_local_requests?
+    true
+  end
 end

app/models/hooks/web_hook.rb

@@ -3,7 +3,9 @@ class WebHook < ActiveRecord::Base
 
   has_many :web_hook_logs, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
 
-  validates :url, presence: true, url: true
+  validates :url, presence: true, public_url: { allow_localhost: lambda(&:allow_local_requests?),
+                                                allow_local_network: lambda(&:allow_local_requests?) }
+
   validates :token, format: { without: /\n/ }
 
   def execute(data, hook_name)
@@ -13,4 +15,9 @@ class WebHook < ActiveRecord::Base
   def async_execute(data, hook_name)
     WebHookService.new(self, data, hook_name).async_execute
   end
+
+  # Allow urls pointing localhost and the local network
+  def allow_local_requests?
+    false
+  end
 end

app/models/project.rb

@@ -289,8 +289,9 @@ class Project < ActiveRecord::Base
 
   validates :namespace, presence: true
   validates :name, uniqueness: { scope: :namespace_id }
-  validates :import_url, addressable_url: true, if: :external_import?
-  validates :import_url, importable_url: true, if: [:external_import?, :import_url_changed?]
+  validates :import_url, url: { protocols: %w(http https ssh git),
+                                allow_localhost: false,
+                                ports: VALID_IMPORT_PORTS }, if: [:external_import?, :import_url_changed?]
   validates :star_count, numericality: { greater_than_or_equal_to: 0 }
   validate :check_limit, on: :create
   validate :check_repository_path_availability, on: :update, if: ->(project) { project.renamed? }

app/models/project_services/bamboo_service.rb

@@ -3,7 +3,7 @@ class BambooService < CiService
 
   prop_accessor :bamboo_url, :build_key, :username, :password
 
-  validates :bamboo_url, presence: true, url: true, if: :activated?
+  validates :bamboo_url, presence: true, public_url: true, if: :activated?
   validates :build_key, presence: true, if: :activated?
   validates :username,
     presence: true,

app/models/project_services/bugzilla_service.rb

 class BugzillaService < IssueTrackerService
-  validates :project_url, :issues_url, :new_issue_url, presence: true, url: true, if: :activated?
+  validates :project_url, :issues_url, :new_issue_url, presence: true, public_url: true, if: :activated?
 
   prop_accessor :title, :description, :project_url, :issues_url, :new_issue_url
 

app/models/project_services/buildkite_service.rb

@@ -8,7 +8,7 @@ class BuildkiteService < CiService
   prop_accessor :project_url, :token
   boolean_accessor :enable_ssl_verification
 
-  validates :project_url, presence: true, url: true, if: :activated?
+  validates :project_url, presence: true, public_url: true, if: :activated?
   validates :token, presence: true, if: :activated?
 
   after_save :compose_service_hook, if: :activated?

app/models/project_services/chat_notification_service.rb

@@ -8,7 +8,7 @@ class ChatNotificationService < Service
   prop_accessor :webhook, :username, :channel
   boolean_accessor :notify_only_broken_pipelines, :notify_only_default_branch
 
-  validates :webhook, presence: true, url: true, if: :activated?
+  validates :webhook, presence: true, public_url: true, if: :activated?
 
   def initialize_properties
     # Custom serialized properties initialization

app/models/project_services/custom_issue_tracker_service.rb

 class CustomIssueTrackerService < IssueTrackerService
-  validates :project_url, :issues_url, :new_issue_url, presence: true, url: true, if: :activated?
+  validates :project_url, :issues_url, :new_issue_url, presence: true, public_url: true, if: :activated?
 
   prop_accessor :title, :description, :project_url, :issues_url, :new_issue_url
 

app/models/project_services/drone_ci_service.rb

@@ -4,7 +4,7 @@ class DroneCiService < CiService
   prop_accessor :drone_url, :token
   boolean_accessor :enable_ssl_verification
 
-  validates :drone_url, presence: true, url: true, if: :activated?
+  validates :drone_url, presence: true, public_url: true, if: :activated?
   validates :token, presence: true, if: :activated?
 
   after_save :compose_service_hook, if: :activated?

app/models/project_services/external_wiki_service.rb

 class ExternalWikiService < Service
   prop_accessor :external_wiki_url
 
-  validates :external_wiki_url, presence: true, url: true, if: :activated?
+  validates :external_wiki_url, presence: true, public_url: true, if: :activated?
 
   def title
     'External Wiki'

app/models/project_services/gitlab_issue_tracker_service.rb

 class GitlabIssueTrackerService < IssueTrackerService
   include Gitlab::Routing
 
-  validates :project_url, :issues_url, :new_issue_url, presence: true, url: true, if: :activated?
+  validates :project_url, :issues_url, :new_issue_url, presence: true, public_url: true, if: :activated?
 
   prop_accessor :title, :description, :project_url, :issues_url, :new_issue_url
 

app/models/project_services/jira_service.rb

@@ -3,8 +3,8 @@ class JiraService < IssueTrackerService
   include ApplicationHelper
   include ActionView::Helpers::AssetUrlHelper
 
-  validates :url, url: true, presence: true, if: :activated?
-  validates :api_url, url: true, allow_blank: true
+  validates :url, public_url: true, presence: true, if: :activated?
+  validates :api_url, public_url: true, allow_blank: true
   validates :username, presence: true, if: :activated?
   validates :password, presence: true, if: :activated?
 

app/models/project_services/kubernetes_service.rb

@@ -24,7 +24,7 @@ class KubernetesService < DeploymentService
   prop_accessor :ca_pem
 
   with_options presence: true, if: :activated? do
-    validates :api_url, url: true
+    validates :api_url, public_url: true
     validates :token
   end
 

app/models/project_services/mock_ci_service.rb

@@ -3,7 +3,7 @@ class MockCiService < CiService
   ALLOWED_STATES = %w[failed canceled running pending success success_with_warnings skipped not_found].freeze
 
   prop_accessor :mock_service_url
-  validates :mock_service_url, presence: true, url: true, if: :activated?
+  validates :mock_service_url, presence: true, public_url: true, if: :activated?
 
   def title
     'MockCI'

app/models/project_services/prometheus_service.rb

@@ -6,7 +6,7 @@ class PrometheusService < MonitoringService
   boolean_accessor :manual_configuration
 
   with_options presence: true, if: :manual_configuration? do
-    validates :api_url, url: true
+    validates :api_url, public_url: true
   end
 
   before_save :synchronize_service_state

app/models/project_services/redmine_service.rb

 class RedmineService < IssueTrackerService
-  validates :project_url, :issues_url, :new_issue_url, presence: true, url: true, if: :activated?
+  validates :project_url, :issues_url, :new_issue_url, presence: true, public_url: true, if: :activated?
 
   prop_accessor :title, :description, :project_url, :issues_url, :new_issue_url
 

app/models/project_services/teamcity_service.rb

@@ -3,7 +3,7 @@ class TeamcityService < CiService
 
   prop_accessor :teamcity_url, :build_type, :username, :password
 
-  validates :teamcity_url, presence: true, url: true, if: :activated?
+  validates :teamcity_url, presence: true, public_url: true, if: :activated?
   validates :build_type, presence: true, if: :activated?
   validates :username,
     presence: true,

app/models/remote_mirror.rb

@@ -17,7 +17,6 @@ class RemoteMirror < ActiveRecord::Base
   belongs_to :project, inverse_of: :remote_mirrors
 
   validates :url, presence: true, url: { protocols: %w(ssh git http https), allow_blank: true }
-  validates :url, addressable_url: true, if: :url_changed?
 
   before_save :set_new_remote_name, if: :mirror_url_changed?
 

app/services/projects/import_service.rb

@@ -29,7 +29,7 @@ module Projects
     def add_repository_to_project
       if project.external_import? && !unknown_url?
         begin
-          Gitlab::UrlBlocker.validate!(project.import_url, valid_ports: Project::VALID_IMPORT_PORTS)
+          Gitlab::UrlBlocker.validate!(project.import_url, ports: Project::VALID_IMPORT_PORTS)
         rescue Gitlab::UrlBlocker::BlockedUrlError => e
           raise Error, "Blocked import URL: #{e.message}"
         end

app/validators/addressable_url_validator.rb

-# AddressableUrlValidator
-#
-# Custom validator for URLs. This is a stricter version of UrlValidator - it also checks
-# for using the right protocol, but it actually parses the URL checking for any syntax errors.
-# The regex is also different from `URI` as we use `Addressable::URI` here.
-#
-# By default, only URLs for http, https, ssh, and git protocols will be considered valid.
-# Provide a `:protocols` option to configure accepted protocols.
-#
-# Example:
-#
-#   class User < ActiveRecord::Base
-#     validates :personal_url, addressable_url: true
-#
-#     validates :ftp_url, addressable_url: { protocols: %w(ftp) }
-#
-#     validates :git_url, addressable_url: { protocols: %w(http https ssh git) }
-#   end
-#
-class AddressableUrlValidator < ActiveModel::EachValidator
-  DEFAULT_OPTIONS = { protocols: %w(http https ssh git) }.freeze
-
-  def validate_each(record, attribute, value)
-    unless valid_url?(value)
-      record.errors.add(attribute, "must be a valid URL")
-    end
-  end
-
-  private
-
-  def valid_url?(value)
-    return false unless value
-
-    valid_protocol?(value) && valid_uri?(value)
-  end
-
-  def valid_uri?(value)
-    Gitlab::UrlSanitizer.valid?(value)
-  end
-
-  def valid_protocol?(value)
-    options = DEFAULT_OPTIONS.merge(self.options)
-    value =~ /\A#{URI.regexp(options[:protocols])}\z/
-  end
-end

app/validators/importable_url_validator.rb

-# ImportableUrlValidator
-#
-# This validator blocks projects from using dangerous import_urls to help
-# protect against Server-side Request Forgery (SSRF).
-class ImportableUrlValidator < ActiveModel::EachValidator
-  def validate_each(record, attribute, value)
-    Gitlab::UrlBlocker.validate!(value, valid_ports: Project::VALID_IMPORT_PORTS)
-  rescue Gitlab::UrlBlocker::BlockedUrlError => e
-    record.errors.add(attribute, "is blocked: #{e.message}")
-  end
-end

app/validators/public_url_validator.rb

+# PublicUrlValidator
+#
+# Custom validator for URLs. This validator works like UrlValidator but
+# it blocks by default urls pointing to localhost or the local network.
+#
+# This validator accepts the same params UrlValidator does.
+#
+# Example:
+#
+#   class User < ActiveRecord::Base
+#     validates :personal_url, public_url: true
+#
+#     validates :ftp_url, public_url: { protocols: %w(ftp) }
+#
+#     validates :git_url, public_url: { allow_localhost: true, allow_local_network: true}
+#   end
+#
+class PublicUrlValidator < UrlValidator
+  private
+
+  def default_options
+    # By default block all urls pointing to localhost or the local network
+    super.merge(allow_localhost: false,
+                allow_local_network: false)
+  end
+end

app/validators/url_placeholder_validator.rb

-# UrlValidator
-#
-# Custom validator for URLs.
-#
-# By default, only URLs for the HTTP(S) protocols will be considered valid.
-# Provide a `:protocols` option to configure accepted protocols.
-#
-# Also, this validator can help you validate urls with placeholders inside.
-# Usually, if you have a url like 'http://www.example.com/%{project_path}' the
-# URI parser will reject that URL format. Provide a `:placeholder_regex` option
-# to configure accepted placeholders.
-#
-# Example:
-#
-#   class User < ActiveRecord::Base
-#     validates :personal_url, url: true
-#
-#     validates :ftp_url, url: { protocols: %w(ftp) }
-#
-#     validates :git_url, url: { protocols: %w(http https ssh git) }
-#
-#     validates :placeholder_url, url: { placeholder_regex: /(project_path|project_id|default_branch)/ }
-#   end
-#
-class UrlPlaceholderValidator < UrlValidator
-  def validate_each(record, attribute, value)
-    placeholder_regex = self.options[:placeholder_regex]
-    value = value.gsub(/%{#{placeholder_regex}}/, 'foo') if placeholder_regex && value
-
-    super(record, attribute, value)
-  end
-end

app/validators/url_validator.rb

@@ -15,25 +15,63 @@
 #     validates :git_url, url: { protocols: %w(http https ssh git) }
 #   end
 #
+# This validator can also block urls pointing to localhost or the local network to
+# protect against Server-side Request Forgery (SSRF), or check for the right port.
+#
+# Example:
+#   class User < ActiveRecord::Base
+#     validates :personal_url, url: { allow_localhost: false, allow_local_network: false}
+#
+#     validates :web_url, url: { ports: [80, 443] }
+#   end
 class UrlValidator < ActiveModel::EachValidator
+  DEFAULT_PROTOCOLS = %w(http https).freeze
+
+  attr_reader :record
+
   def validate_each(record, attribute, value)
-    unless valid_url?(value)
+    @record = record
+
+    if value.present?
+      value.strip!
+    else
       record.errors.add(attribute, "must be a valid URL")
     end
+
+    Gitlab::UrlBlocker.validate!(value, blocker_args)
+  rescue Gitlab::UrlBlocker::BlockedUrlError => e
+    record.errors.add(attribute, "is blocked: #{e.message}")
   end
 
   private
 
   def default_options
-    @default_options ||= { protocols: %w(http https) }
+    # By default the validator doesn't block any url based on the ip address
+    {
+      protocols: DEFAULT_PROTOCOLS,
+      ports: [],
+      allow_localhost: true,
+      allow_local_network: true
+    }
   end
 
-  def valid_url?(value)
-    return false if value.nil?
+  def current_options
+    options = self.options.map do |option, value|
+      [option, value.is_a?(Proc) ? value.call(record) : value]
+    end.to_h
 
-    options = default_options.merge(self.options)
+    default_options.merge(options)
+  end
 
-    value.strip!
-    value =~ /\A#{URI.regexp(options[:protocols])}\z/
+  def blocker_args
+    current_options.slice(:allow_localhost, :allow_local_network, :protocols, :ports).tap do |args|
+      if allow_setting_local_requests?
+        args[:allow_localhost] = args[:allow_local_network] = true
+      end
+    end
+  end
+
+  def allow_setting_local_requests?
+    ApplicationSetting.current&.allow_local_requests_from_hooks_and_services?
   end
 end

changelogs/unreleased/fj-45059-add-validation-to-webhook.yml

+---
+title: Refactoring UrlValidators to include url blocking
+merge_request: 18686
+author:
+type: changed

lib/gitlab/url_blocker.rb

@@ -5,7 +5,7 @@ module Gitlab
     BlockedUrlError = Class.new(StandardError)
 
     class << self
-      def validate!(url, allow_localhost: false, allow_local_network: true, valid_ports: [])
+      def validate!(url, allow_localhost: false, allow_local_network: true, ports: [], protocols: [])
         return true if url.nil?
 
         begin
@@ -18,7 +18,8 @@ module Gitlab
         return true if internal?(uri)
 
         port = uri.port || uri.default_port
-        validate_port!(port, valid_ports) if valid_ports.any?
+        validate_protocol!(uri.scheme, protocols)
+        validate_port!(port, ports) if ports.any?
         validate_user!(uri.user)
         validate_hostname!(uri.hostname)
 
@@ -44,13 +45,19 @@ module Gitlab
 
       private
 
-      def validate_port!(port, valid_ports)
+      def validate_port!(port, ports)
         return if port.blank?
         # Only ports under 1024 are restricted
         return if port >= 1024
-        return if valid_ports.include?(port)
+        return if ports.include?(port)
 
-        raise BlockedUrlError, "Only allowed ports are #{valid_ports.join(', ')}, and any over 1024"
+        raise BlockedUrlError, "Only allowed ports are #{ports.join(', ')}, and any over 1024"
+      end
+
+      def validate_protocol!(protocol, protocols)
+        if protocol.blank? || (protocols.any? && !protocols.include?(protocol))
+          raise BlockedUrlError, "Only allowed protocols are #{protocols.join(', ')}"
+        end
       end
 
       def validate_user!(value)

spec/controllers/projects/mirrors_controller_spec.rb

@@ -54,7 +54,7 @@ describe Projects::MirrorsController do
         do_put(project, remote_mirrors_attributes: remote_mirror_attributes)
 
         expect(response).to redirect_to(project_settings_repository_path(project))
-        expect(flash[:alert]).to match(/must be a valid URL/)
+        expect(flash[:alert]).to match(/Only allowed protocols are/)
       end
 
       it 'should not create a RemoteMirror object' do

spec/controllers/projects/services_controller_spec.rb

@@ -102,7 +102,7 @@ describe Projects::ServicesController do
 
         expect(response.status).to eq(200)
         expect(JSON.parse(response.body))
-          .to eq('error' => true, 'message' => 'Test failed.', 'service_response' => 'Bad test')
+          .to eq('error' => true, 'message' => 'Test failed.', 'service_response' => 'Bad test', 'test_failed' => true)
       end
     end
   end

spec/javascripts/integrations/integration_settings_form_spec.js

@@ -143,6 +143,7 @@ describe('IntegrationSettingsForm', () => {
         error: true,
         message: errorMessage,
         service_response: 'some error',
+        test_failed: true,
       });
 
       integrationSettingsForm.testSettings(formData)
@@ -157,6 +158,27 @@ describe('IntegrationSettingsForm', () => {
         .catch(done.fail);
     });
 
+    it('should not show error Flash with `Save anyway` action if ajax request responds with error in validation', (done) => {
+      const errorMessage = 'Validations failed.';
+      mock.onPut(integrationSettingsForm.testEndPoint).reply(200, {
+        error: true,
+        message: errorMessage,
+        service_response: 'some error',
+        test_failed: false,
+      });
+
+      integrationSettingsForm.testSettings(formData)
+        .then(() => {
+          const $flashContainer = $('.flash-container');
+          expect($flashContainer.find('.flash-text').text().trim()).toEqual('Validations failed. some error');
+          expect($flashContainer.find('.flash-action')).toBeDefined();
+          expect($flashContainer.find('.flash-action').text().trim()).toEqual('');
+
+          done();
+        })
+        .catch(done.fail);
+    });
+
     it('should submit form if ajax request responds without any error in test', (done) => {
       spyOn(integrationSettingsForm.$form, 'submit');
 
@@ -180,6 +202,7 @@ describe('IntegrationSettingsForm', () => {
       mock.onPut(integrationSettingsForm.testEndPoint).reply(200, {
         error: true,
         message: errorMessage,
+        test_failed: true,
       });
 
       integrationSettingsForm.testSettings(formData)

spec/lib/gitlab/url_blocker_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe Gitlab::UrlBlocker do
   describe '#blocked_url?' do
-    let(:valid_ports) { Project::VALID_IMPORT_PORTS }
+    let(:ports) { Project::VALID_IMPORT_PORTS }
 
     it 'allows imports from configured web host and port' do
       import_url = "http://#{Gitlab.config.gitlab.host}:#{Gitlab.config.gitlab.port}/t.git"
@@ -19,7 +19,13 @@ describe Gitlab::UrlBlocker do
     end
 
     it 'returns true for bad port' do
-      expect(described_class.blocked_url?('https://gitlab.com:25/foo/foo.git', valid_ports: valid_ports)).to be true
+      expect(described_class.blocked_url?('https://gitlab.com:25/foo/foo.git', ports: ports)).to be true
+    end
+
+    it 'returns true for bad protocol' do
+      expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git', protocols: ['https'])).to be false
+      expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git')).to be false
+      expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git', protocols: ['http'])).to be true
     end
 
     it 'returns true for alternative version of 127.0.0.1 (0177.1)' do

spec/models/remote_mirror_spec.rb

@@ -12,8 +12,8 @@ describe RemoteMirror do
     context 'with an invalid URL' do
       it 'should not be valid' do
         remote_mirror = build(:remote_mirror, url: 'ftp://invalid.invalid')
+
         expect(remote_mirror).not_to be_valid
-        expect(remote_mirror.errors[:url].size).to eq(2)
       end
     end
   end

spec/requests/api/commit_statuses_spec.rb

@@ -304,7 +304,7 @@ describe API::CommitStatuses do
         it 'responds with bad request status and validation errors' do
           expect(response).to have_gitlab_http_status(400)
           expect(json_response['message']['target_url'])
-            .to include 'must be a valid URL'
+            .to include 'is blocked: Only allowed protocols are http, https'
         end
       end
     end

spec/validators/url_placeholder_validator_spec.rb → spec/support/shared_examples/url_validator_examples.rb

-require 'spec_helper'
-
-describe UrlPlaceholderValidator do
+RSpec.shared_examples 'url validator examples' do |protocols|
   let(:validator) { described_class.new(attributes: [:link_url],  **options) }
-  let!(:badge) { build(:badge) }
-  let(:placeholder_url) { 'http://www.example.com/%{project_path}/%{project_id}/%{default_branch}/%{commit_sha}' }
+  let!(:badge) { build(:badge, link_url: 'http://www.example.com') }
 
   subject { validator.validate_each(badge, :link_url, badge.link_url) }
 
@@ -11,12 +8,12 @@ describe UrlPlaceholderValidator do
     context 'with no options' do
       let(:options) { {} }
 
-      it 'allows http and https protocols by default' do
-        expect(validator.send(:default_options)[:protocols]).to eq %w(http https)
+      it "allows #{protocols.join(',')} protocols by default" do
+        expect(validator.send(:default_options)[:protocols]).to eq protocols
       end
 
       it 'checks that the url structure is valid' do
-        badge.link_url = placeholder_url
+        badge.link_url = "#{badge.link_url}:invalid_port"
 
         subject
 
@@ -24,16 +21,22 @@ describe UrlPlaceholderValidator do
       end
     end
 
-    context 'with placeholder regex' do
-      let(:options) { { placeholder_regex: /(project_path|project_id|commit_sha|default_branch)/ } }
-
-      it 'checks that the url is valid and obviate placeholders that match regex' do
-        badge.link_url = placeholder_url
+    context 'with protocols' do
+      let(:options) { { protocols: %w[http] } }
 
+      it 'allows urls with the defined protocols' do
         subject
 
         expect(badge.errors.empty?).to be true
       end
+
+      it 'add error if the url protocol does not match the selected ones' do
+        badge.link_url = 'https://www.example.com'
+
+        subject
+
+        expect(badge.errors.empty?).to be false
+      end
     end
   end
 end

spec/validators/public_url_validator_spec.rb

+require 'spec_helper'
+
+describe PublicUrlValidator do
+  include_examples 'url validator examples', described_class::DEFAULT_PROTOCOLS
+
+  context 'by default' do
+    let(:validator) { described_class.new(attributes: [:link_url]) }
+    let!(:badge) { build(:badge, link_url: 'http://www.example.com') }
+
+    subject { validator.validate_each(badge, :link_url, badge.link_url) }
+
+    it 'blocks urls pointing to localhost' do
+      badge.link_url = 'https://127.0.0.1'
+
+      subject
+
+      expect(badge.errors.empty?).to be false
+    end
+
+    it 'blocks urls pointing to the local network' do
+      badge.link_url = 'https://192.168.1.1'
+
+      subject
+
+      expect(badge.errors.empty?).to be false
+    end
+  end
+end

spec/validators/url_validator_spec.rb

 require 'spec_helper'
 
 describe UrlValidator do
-  let(:validator) { described_class.new(attributes: [:link_url],  **options) }
-  let!(:badge) { build(:badge) }
-
+  let!(:badge) { build(:badge, link_url: 'http://www.example.com') }
   subject { validator.validate_each(badge, :link_url, badge.link_url) }
 
-  describe '#validates_each' do
-    context 'with no options' do
-      let(:options) { {} }
+  include_examples 'url validator examples', described_class::DEFAULT_PROTOCOLS
+
+  context 'by default' do
+    let(:validator) { described_class.new(attributes: [:link_url]) }
+
+    it 'does not block urls pointing to localhost' do
+      badge.link_url = 'https://127.0.0.1'
+
+      subject
 
-      it 'allows http and https protocols by default' do
-        expect(validator.send(:default_options)[:protocols]).to eq %w(http https)
+      expect(badge.errors.empty?).to be true
     end
 
-      it 'checks that the url structure is valid' do
-        badge.link_url = 'http://www.google.es/%{whatever}'
+    it 'does not block urls pointing to the local network' do
+      badge.link_url = 'https://192.168.1.1'
 
       subject
 
-        expect(badge.errors.empty?).to be false
+      expect(badge.errors.empty?).to be true
     end
   end
 
-    context 'with protocols' do
-      let(:options) { { protocols: %w(http) } }
+  context 'when allow_localhost is set to false' do
+    let(:validator) { described_class.new(attributes: [:link_url], allow_localhost: false) }
 
-      it 'allows urls with the defined protocols' do
-        badge.link_url = 'http://www.example.com'
+    it 'blocks urls pointing to localhost' do
+      badge.link_url = 'https://127.0.0.1'
 
       subject
 
-        expect(badge.errors.empty?).to be true
+      expect(badge.errors.empty?).to be false
+    end
   end
 
-      it 'add error if the url protocol does not match the selected ones' do
-        badge.link_url = 'https://www.example.com'
+  context 'when allow_local_network is set to false' do
+    let(:validator) { described_class.new(attributes: [:link_url], allow_local_network: false) }
+
+    it 'blocks urls pointing to the local network' do
+      badge.link_url = 'https://192.168.1.1'
 
       subject
 
       expect(badge.errors.empty?).to be false
     end
   end
+
+  context 'when ports is set' do
+    let(:validator) { described_class.new(attributes: [:link_url], ports: [443]) }
+
+    it 'blocks urls with a different port' do
+      subject
+
+      expect(badge.errors.empty?).to be false
+    end
   end
 end