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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
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 checks if login credentials are not provided
return unless login.present? && 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)
return if user && !user.active?
authenticators = []
if user
authenticators << Gitlab::Auth::OAuth::Provider.authentication(user, 'database')
# Add authenticators for all identities if user is not nil
user&.identities&.each do |identity|
authenticators << Gitlab::Auth::OAuth::Provider.authentication(user, identity.provider)
end
else
# If no user is provided, try LDAP.
# LDAP users are only authenticated via LDAP
authenticators << Gitlab::Auth::LDAP::Authentication
end
authenticators.compact!
user if authenticators.find { |auth| auth.login(login, password) }
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?
Gitlab::CurrentSettings.password_authentication_enabled_for_git? || Gitlab::Auth::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
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