discourse/lib/discourse_webauthn.rb

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# frozen_string_literal: true
require "webauthn/challenge_generator"
require "webauthn/security_key_base_validation_service"
require "webauthn/security_key_registration_service"
require "webauthn/security_key_authentication_service"
module DiscourseWebauthn
ACCEPTABLE_REGISTRATION_TYPE = "webauthn.create"
ACCEPTABLE_AUTHENTICATION_TYPE = "webauthn.get"
# -7 - ES256
# -257 - RS256 (Windows Hello supported alg.)
SUPPORTED_ALGORITHMS = COSE::Algorithm.registered_algorithm_ids.freeze
VALID_ATTESTATION_FORMATS = %w[none packed fido-u2f].freeze
class SecurityKeyError < StandardError
end
class InvalidOriginError < SecurityKeyError
end
class InvalidRelyingPartyIdError < SecurityKeyError
end
class UserVerificationError < SecurityKeyError
end
class ChallengeMismatchError < SecurityKeyError
end
class InvalidTypeError < SecurityKeyError
end
class UnsupportedPublicKeyAlgorithmError < SecurityKeyError
end
class UnsupportedAttestationFormatError < SecurityKeyError
end
class CredentialIdInUseError < SecurityKeyError
end
class MalformedAttestationError < SecurityKeyError
end
class NotFoundError < SecurityKeyError
end
class OwnershipError < SecurityKeyError
end
class PublicKeyError < SecurityKeyError
end
class UnknownCOSEAlgorithmError < SecurityKeyError
end
##
# Usage:
#
# These methods should be used in controllers where we
# are challenging the user that has a security key, and
# they must respond with a valid webauthn response and
# credentials.
def self.stage_challenge(user, secure_session)
::DiscourseWebauthn::ChallengeGenerator.generate.commit_to_session(secure_session, user)
end
def self.allowed_credentials(user, secure_session)
return {} if !user.security_keys_enabled?
credential_ids = user.second_factor_security_key_credential_ids
{
allowed_credential_ids: credential_ids,
challenge: secure_session[self.session_challenge_key(user)],
}
end
def self.challenge(user, secure_session)
secure_session[self.session_challenge_key(user)]
end
def self.rp_id
Discourse.current_hostname
end
def self.rp_name
SiteSetting.title
end
def self.session_challenge_key(user)
"staged-webauthn-challenge-#{user&.id}"
end
end