debian-mirror-gitlab/app/controllers/jwt_controller.rb

# frozen_string_literal: true

class JwtController < ApplicationController
  skip_around_action :set_session_storage
  skip_before_action :authenticate_user!
  skip_before_action :verify_authenticity_token

  # Add this before other actions, since we want to have the user or project
  prepend_before_action :auth_user, :authenticate_project_or_user

  feature_category :system_access
  # https://gitlab.com/gitlab-org/gitlab/-/issues/357037
  urgency :low

  SERVICES = {
    ::Auth::ContainerRegistryAuthenticationService::AUDIENCE => ::Auth::ContainerRegistryAuthenticationService,
    ::Auth::DependencyProxyAuthenticationService::AUDIENCE => ::Auth::DependencyProxyAuthenticationService
  }.freeze

  def auth
    service = SERVICES[params[:service]]
    return head :not_found unless service

    result = service.new(@authentication_result.project, auth_user, auth_params)
      .execute(authentication_abilities: @authentication_result.authentication_abilities)

    render json: result, status: result[:http_status]
  end

  private

  def authenticate_project_or_user
    @authentication_result = Gitlab::Auth::Result.new(nil, nil, :none, Gitlab::Auth.read_only_authentication_abilities)

    authenticate_with_http_basic do |login, password|
      @authentication_result = Gitlab::Auth.find_for_git_client(login, password, project: nil, ip: request.ip)

      if @authentication_result.failed?
        log_authentication_failed(login, @authentication_result)
        render_access_denied
      end
    end
  rescue Gitlab::Auth::MissingPersonalAccessTokenError
    render_access_denied
  end

  def log_authentication_failed(login, result)
    log_info = {
      message: 'JWT authentication failed',
      http_user: login,
      remote_ip: request.ip,
      auth_service: params[:service],
      'auth_result.type': result.type,
      'auth_result.actor_type': result.actor&.class
    }.merge(::Gitlab::ApplicationContext.current)

    Gitlab::AuthLogger.warn(log_info)
  end

  def render_access_denied
    help_page = help_page_url(
      'user/profile/account/two_factor_authentication',
      anchor: 'troubleshooting'
    )

    render(
      json: { errors: [{
        code: 'UNAUTHORIZED',
        message: format(_("HTTP Basic: Access denied. The provided password or token is incorrect or your account has 2FA enabled and you must use a personal access token instead of a password. See %{help_page_url}"), help_page_url: help_page)
      }] },
      status: :unauthorized
    )
  end

  def auth_params
    params.permit(:service, :account, :client_id)
          .merge(additional_params)
  end

  def additional_params
    {
      scopes: scopes_param,
      deploy_token: @authentication_result.deploy_token,
      auth_type: @authentication_result.type
    }.compact
  end

  # We have to parse scope here, because Docker Client does not send an array of scopes,
  # but rather a flat list and we loose second scope when being processed by Rails:
  # scope=scopeA&scope=scopeB
  #
  # This method makes to always return an array of scopes
  def scopes_param
    return unless params[:scope].present?

    Array(Rack::Utils.parse_query(request.query_string)['scope'])
  end

  def auth_user
    strong_memoize(:auth_user) do
      @authentication_result.auth_user
    end
  end
end