325 lines
10 KiB
Ruby
325 lines
10 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Auth
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MissingPersonalAccessTokenError = Class.new(StandardError)
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# Scopes used for GitLab API access
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API_SCOPES = [:api, :read_user].freeze
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# Scopes used for GitLab Repository access
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REPOSITORY_SCOPES = [:read_repository, :write_repository].freeze
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# Scopes used for GitLab Docker Registry access
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REGISTRY_SCOPES = [:read_registry].freeze
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# Scopes used for GitLab as admin
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ADMIN_SCOPES = [:sudo].freeze
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# Scopes used for OpenID Connect
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OPENID_SCOPES = [:openid].freeze
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# OpenID Connect profile scopes
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PROFILE_SCOPES = [:profile, :email].freeze
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# Default scopes for OAuth applications that don't define their own
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DEFAULT_SCOPES = [:api].freeze
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class << self
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def omniauth_enabled?
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Gitlab.config.omniauth.enabled
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end
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def find_for_git_client(login, password, project:, ip:)
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raise "Must provide an IP for rate limiting" if ip.nil?
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# `user_with_password_for_git` should be the last check
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# because it's the most expensive, especially when LDAP
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# is enabled.
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result =
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service_request_check(login, password, project) ||
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build_access_token_check(login, password) ||
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lfs_token_check(login, password, project) ||
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oauth_access_token_check(login, password) ||
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personal_access_token_check(password) ||
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deploy_token_check(login, password) ||
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user_with_password_for_git(login, password) ||
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Gitlab::Auth::Result.new
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rate_limit!(ip, success: result.success?, login: login)
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Gitlab::Auth::UniqueIpsLimiter.limit_user!(result.actor)
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return result if result.success? || authenticate_using_internal_or_ldap_password?
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# If sign-in is disabled and LDAP is not configured, recommend a
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# personal access token on failed auth attempts
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raise Gitlab::Auth::MissingPersonalAccessTokenError
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end
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def find_with_user_password(login, password)
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# Avoid resource intensive checks if login credentials are not provided
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return unless login.present? && password.present?
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# Nothing to do here if internal auth is disabled and LDAP is
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# not configured
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return unless authenticate_using_internal_or_ldap_password?
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Gitlab::Auth::UniqueIpsLimiter.limit_user! do
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user = User.by_login(login)
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break if user && !user.active?
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authenticators = []
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if user
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authenticators << Gitlab::Auth::OAuth::Provider.authentication(user, 'database')
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# Add authenticators for all identities if user is not nil
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user&.identities&.each do |identity|
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authenticators << Gitlab::Auth::OAuth::Provider.authentication(user, identity.provider)
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end
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else
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# If no user is provided, try LDAP.
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# LDAP users are only authenticated via LDAP
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authenticators << Gitlab::Auth::LDAP::Authentication
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end
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authenticators.compact!
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# return found user that was authenticated first for given login credentials
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authenticators.find do |auth|
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authenticated_user = auth.login(login, password)
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break authenticated_user if authenticated_user
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end
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end
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end
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# rubocop:disable Gitlab/RailsLogger
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def rate_limit!(ip, success:, login:)
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rate_limiter = Gitlab::Auth::IpRateLimiter.new(ip)
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return unless rate_limiter.enabled?
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if success
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# Repeated login 'failures' are normal behavior for some Git clients so
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# it is important to reset the ban counter once the client has proven
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# they are not a 'bad guy'.
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rate_limiter.reset!
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else
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# Register a login failure so that Rack::Attack can block the next
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# request from this IP if needed.
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rate_limiter.register_fail!
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if rate_limiter.banned?
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Rails.logger.info "IP #{ip} failed to login " \
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"as #{login} but has been temporarily banned from Git auth"
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end
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end
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end
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# rubocop:enable Gitlab/RailsLogger
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private
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def authenticate_using_internal_or_ldap_password?
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Gitlab::CurrentSettings.password_authentication_enabled_for_git? || Gitlab::Auth::LDAP::Config.enabled?
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end
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def service_request_check(login, password, project)
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matched_login = /(?<service>^[a-zA-Z]*-ci)-token$/.match(login)
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return unless project && matched_login.present?
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underscored_service = matched_login['service'].underscore
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if Service.available_services_names.include?(underscored_service)
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# We treat underscored_service as a trusted input because it is included
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# in the Service.available_services_names whitelist.
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service = project.public_send("#{underscored_service}_service") # rubocop:disable GitlabSecurity/PublicSend
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if service && service.activated? && service.valid_token?(password)
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Gitlab::Auth::Result.new(nil, project, :ci, build_authentication_abilities)
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end
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end
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end
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def user_with_password_for_git(login, password)
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user = find_with_user_password(login, password)
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return unless user
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raise Gitlab::Auth::MissingPersonalAccessTokenError if user.two_factor_enabled?
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Gitlab::Auth::Result.new(user, nil, :gitlab_or_ldap, full_authentication_abilities)
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end
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# rubocop: disable CodeReuse/ActiveRecord
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def oauth_access_token_check(login, password)
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if login == "oauth2" && password.present?
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token = Doorkeeper::AccessToken.by_token(password)
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if valid_oauth_token?(token)
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user = User.find_by(id: token.resource_owner_id)
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Gitlab::Auth::Result.new(user, nil, :oauth, full_authentication_abilities)
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end
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end
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end
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# rubocop: enable CodeReuse/ActiveRecord
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def personal_access_token_check(password)
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return unless password.present?
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token = PersonalAccessTokensFinder.new(state: 'active').find_by_token(password)
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if token && valid_scoped_token?(token, all_available_scopes)
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Gitlab::Auth::Result.new(token.user, nil, :personal_access_token, abilities_for_scopes(token.scopes))
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end
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end
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def valid_oauth_token?(token)
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token && token.accessible? && valid_scoped_token?(token, [:api])
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end
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def valid_scoped_token?(token, scopes)
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AccessTokenValidationService.new(token).include_any_scope?(scopes)
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end
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def abilities_for_scopes(scopes)
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abilities_by_scope = {
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api: full_authentication_abilities,
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read_registry: [:read_container_image],
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read_repository: [:download_code],
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write_repository: [:download_code, :push_code]
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}
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scopes.flat_map do |scope|
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abilities_by_scope.fetch(scope.to_sym, [])
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end.uniq
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end
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# rubocop: disable CodeReuse/ActiveRecord
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def deploy_token_check(login, password)
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return unless password.present?
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token =
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DeployToken.active.find_by(token: password)
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return unless token && login
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return if login != token.username
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scopes = abilities_for_scopes(token.scopes)
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if valid_scoped_token?(token, all_available_scopes)
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Gitlab::Auth::Result.new(token, token.project, :deploy_token, scopes)
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end
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end
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# rubocop: enable CodeReuse/ActiveRecord
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def lfs_token_check(login, encoded_token, project)
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deploy_key_matches = login.match(/\Alfs\+deploy-key-(\d+)\z/)
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actor =
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if deploy_key_matches
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DeployKey.find(deploy_key_matches[1])
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else
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User.by_login(login)
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end
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return unless actor
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token_handler = Gitlab::LfsToken.new(actor)
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authentication_abilities =
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if token_handler.user?
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full_authentication_abilities
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elsif token_handler.deploy_key_pushable?(project)
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read_write_authentication_abilities
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else
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read_only_authentication_abilities
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end
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if token_handler.token_valid?(encoded_token)
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Gitlab::Auth::Result.new(actor, nil, token_handler.type, authentication_abilities)
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end
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end
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def build_access_token_check(login, password)
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return unless login == 'gitlab-ci-token'
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return unless password
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build = find_build_by_token(password)
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return unless build
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return unless build.project.builds_enabled?
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if build.user
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# If user is assigned to build, use restricted credentials of user
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Gitlab::Auth::Result.new(build.user, build.project, :build, build_authentication_abilities)
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else
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# Otherwise use generic CI credentials (backward compatibility)
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Gitlab::Auth::Result.new(nil, build.project, :ci, build_authentication_abilities)
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end
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end
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public
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def build_authentication_abilities
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[
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:read_project,
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:build_download_code,
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:build_read_container_image,
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:build_create_container_image
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]
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end
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def read_only_authentication_abilities
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[
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:read_project,
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:download_code,
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:read_container_image
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]
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end
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def read_write_authentication_abilities
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read_only_authentication_abilities + [
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:push_code,
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:create_container_image
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]
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end
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def full_authentication_abilities
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read_write_authentication_abilities + [
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:admin_container_image
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]
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end
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def available_scopes_for(current_user)
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scopes = non_admin_available_scopes
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scopes += ADMIN_SCOPES if current_user.admin?
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scopes
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end
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def all_available_scopes
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non_admin_available_scopes + ADMIN_SCOPES
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end
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# Other available scopes
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def optional_scopes
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all_available_scopes + OPENID_SCOPES + PROFILE_SCOPES - DEFAULT_SCOPES
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end
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def registry_scopes
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return [] unless Gitlab.config.registry.enabled
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REGISTRY_SCOPES
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end
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private
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def non_admin_available_scopes
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API_SCOPES + REPOSITORY_SCOPES + registry_scopes
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end
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def find_build_by_token(token)
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::Ci::Build.running.find_by_token(token)
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end
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end
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end
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end
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