/lib/gitlab/auth.rb
Ruby | 255 lines | 177 code | 54 blank | 24 comment | 32 complexity | 1a6b96232df33163e9241a64ab86ec26 MD5 | raw file
- module Gitlab
- module Auth
- MissingPersonalAccessTokenError = Class.new(StandardError)
- REGISTRY_SCOPES = [:read_registry].freeze
- # Scopes used for GitLab API access
- API_SCOPES = [:api, :read_user, :sudo].freeze
- # Scopes used for OpenID Connect
- OPENID_SCOPES = [:openid].freeze
- # Default scopes for OAuth applications that don't define their own
- DEFAULT_SCOPES = [:api].freeze
- class << self
- include Gitlab::CurrentSettings
- def find_for_git_client(login, password, project:, ip:)
- raise "Must provide an IP for rate limiting" if ip.nil?
- # `user_with_password_for_git` should be the last check
- # because it's the most expensive, especially when LDAP
- # is enabled.
- result =
- service_request_check(login, password, project) ||
- build_access_token_check(login, password) ||
- lfs_token_check(login, password, project) ||
- oauth_access_token_check(login, password) ||
- personal_access_token_check(password) ||
- user_with_password_for_git(login, password) ||
- Gitlab::Auth::Result.new
- rate_limit!(ip, success: result.success?, login: login)
- Gitlab::Auth::UniqueIpsLimiter.limit_user!(result.actor)
- return result if result.success? || authenticate_using_internal_or_ldap_password?
- # If sign-in is disabled and LDAP is not configured, recommend a
- # personal access token on failed auth attempts
- raise Gitlab::Auth::MissingPersonalAccessTokenError
- end
- def find_with_user_password(login, password)
- # Avoid resource intensive login checks if password is not provided
- return unless password.present?
- # Nothing to do here if internal auth is disabled and LDAP is
- # not configured
- return unless authenticate_using_internal_or_ldap_password?
- Gitlab::Auth::UniqueIpsLimiter.limit_user! do
- user = User.by_login(login)
- # If no user is found, or it's an LDAP server, try LDAP.
- # LDAP users are only authenticated via LDAP
- if user.nil? || user.ldap_user?
- # Second chance - try LDAP authentication
- Gitlab::LDAP::Authentication.login(login, password)
- elsif current_application_settings.password_authentication_enabled_for_git?
- user if user.active? && user.valid_password?(password)
- end
- end
- end
- def rate_limit!(ip, success:, login:)
- rate_limiter = Gitlab::Auth::IpRateLimiter.new(ip)
- return unless rate_limiter.enabled?
- if success
- # Repeated login 'failures' are normal behavior for some Git clients so
- # it is important to reset the ban counter once the client has proven
- # they are not a 'bad guy'.
- rate_limiter.reset!
- else
- # Register a login failure so that Rack::Attack can block the next
- # request from this IP if needed.
- rate_limiter.register_fail!
- if rate_limiter.banned?
- Rails.logger.info "IP #{ip} failed to login " \
- "as #{login} but has been temporarily banned from Git auth"
- end
- end
- end
- private
- def authenticate_using_internal_or_ldap_password?
- current_application_settings.password_authentication_enabled_for_git? || Gitlab::LDAP::Config.enabled?
- end
- def service_request_check(login, password, project)
- matched_login = /(?<service>^[a-zA-Z]*-ci)-token$/.match(login)
- return unless project && matched_login.present?
- underscored_service = matched_login['service'].underscore
- if Service.available_services_names.include?(underscored_service)
- # We treat underscored_service as a trusted input because it is included
- # in the Service.available_services_names whitelist.
- service = project.public_send("#{underscored_service}_service") # rubocop:disable GitlabSecurity/PublicSend
- if service && service.activated? && service.valid_token?(password)
- Gitlab::Auth::Result.new(nil, project, :ci, build_authentication_abilities)
- end
- end
- end
- def user_with_password_for_git(login, password)
- user = find_with_user_password(login, password)
- return unless user
- raise Gitlab::Auth::MissingPersonalAccessTokenError if user.two_factor_enabled?
- Gitlab::Auth::Result.new(user, nil, :gitlab_or_ldap, full_authentication_abilities)
- end
- def oauth_access_token_check(login, password)
- if login == "oauth2" && password.present?
- token = Doorkeeper::AccessToken.by_token(password)
- if valid_oauth_token?(token)
- user = User.find_by(id: token.resource_owner_id)
- Gitlab::Auth::Result.new(user, nil, :oauth, full_authentication_abilities)
- end
- end
- end
- def personal_access_token_check(password)
- return unless password.present?
- token = PersonalAccessTokensFinder.new(state: 'active').find_by(token: password)
- if token && valid_scoped_token?(token, available_scopes)
- Gitlab::Auth::Result.new(token.user, nil, :personal_access_token, abilities_for_scopes(token.scopes))
- end
- end
- def valid_oauth_token?(token)
- token && token.accessible? && valid_scoped_token?(token, [:api])
- end
- def valid_scoped_token?(token, scopes)
- AccessTokenValidationService.new(token).include_any_scope?(scopes)
- end
- def abilities_for_scopes(scopes)
- abilities_by_scope = {
- api: full_authentication_abilities,
- read_registry: [:read_container_image]
- }
- scopes.flat_map do |scope|
- abilities_by_scope.fetch(scope.to_sym, [])
- end.uniq
- end
- def lfs_token_check(login, password, project)
- deploy_key_matches = login.match(/\Alfs\+deploy-key-(\d+)\z/)
- actor =
- if deploy_key_matches
- DeployKey.find(deploy_key_matches[1])
- else
- User.by_login(login)
- end
- return unless actor
- token_handler = Gitlab::LfsToken.new(actor)
- authentication_abilities =
- if token_handler.user?
- full_authentication_abilities
- elsif token_handler.deploy_key_pushable?(project)
- read_write_authentication_abilities
- else
- read_authentication_abilities
- end
- if Devise.secure_compare(token_handler.token, password)
- Gitlab::Auth::Result.new(actor, nil, token_handler.type, authentication_abilities)
- end
- end
- def build_access_token_check(login, password)
- return unless login == 'gitlab-ci-token'
- return unless password
- build = ::Ci::Build.running.find_by_token(password)
- return unless build
- return unless build.project.builds_enabled?
- if build.user
- # If user is assigned to build, use restricted credentials of user
- Gitlab::Auth::Result.new(build.user, build.project, :build, build_authentication_abilities)
- else
- # Otherwise use generic CI credentials (backward compatibility)
- Gitlab::Auth::Result.new(nil, build.project, :ci, build_authentication_abilities)
- end
- end
- public
- def build_authentication_abilities
- [
- :read_project,
- :build_download_code,
- :build_read_container_image,
- :build_create_container_image
- ]
- end
- def read_authentication_abilities
- [
- :read_project,
- :download_code,
- :read_container_image
- ]
- end
- def read_write_authentication_abilities
- read_authentication_abilities + [
- :push_code,
- :create_container_image
- ]
- end
- def full_authentication_abilities
- read_write_authentication_abilities + [
- :admin_container_image
- ]
- end
- def available_scopes(current_user = nil)
- scopes = API_SCOPES + registry_scopes
- scopes.delete(:sudo) if current_user && !current_user.admin?
- scopes
- end
- # Other available scopes
- def optional_scopes
- available_scopes + OPENID_SCOPES - DEFAULT_SCOPES
- end
- def registry_scopes
- return [] unless Gitlab.config.registry.enabled
- REGISTRY_SCOPES
- end
- end
- end
- end