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|
# frozen_string_literal: true
require "openssl"
require "securerandom"
require "webauthn/authenticator_data"
require "webauthn/encoder"
require "webauthn/fake_authenticator"
module WebAuthn
class FakeClient
TYPES = { create: "webauthn.create", get: "webauthn.get" }.freeze
attr_reader :origin, :token_binding
def initialize(
origin = fake_origin,
token_binding: nil,
authenticator: WebAuthn::FakeAuthenticator.new,
encoding: WebAuthn.configuration.encoding
)
@origin = origin
@token_binding = token_binding
@authenticator = authenticator
@encoding = encoding
end
def create(
challenge: fake_challenge,
rp_id: nil,
user_present: true,
user_verified: false,
attested_credential_data: true,
extensions: nil
)
rp_id ||= URI.parse(origin).host
client_data_json = data_json_for(:create, encoder.decode(challenge))
client_data_hash = hashed(client_data_json)
attestation_object = authenticator.make_credential(
rp_id: rp_id,
client_data_hash: client_data_hash,
user_present: user_present,
user_verified: user_verified,
attested_credential_data: attested_credential_data,
extensions: extensions
)
id =
if attested_credential_data
WebAuthn::AuthenticatorData
.deserialize(CBOR.decode(attestation_object)["authData"])
.attested_credential_data
.id
else
"id-for-pk-without-attested-credential-data"
end
{
"type" => "public-key",
"id" => internal_encoder.encode(id),
"rawId" => encoder.encode(id),
"clientExtensionResults" => extensions,
"response" => {
"attestationObject" => encoder.encode(attestation_object),
"clientDataJSON" => encoder.encode(client_data_json)
}
}
end
def get(challenge: fake_challenge,
rp_id: nil,
user_present: true,
user_verified: false,
sign_count: nil,
extensions: nil,
user_handle: nil,
allow_credentials: nil)
rp_id ||= URI.parse(origin).host
client_data_json = data_json_for(:get, encoder.decode(challenge))
client_data_hash = hashed(client_data_json)
if allow_credentials
allow_credentials = allow_credentials.map { |credential| encoder.decode(credential) }
end
assertion = authenticator.get_assertion(
rp_id: rp_id,
client_data_hash: client_data_hash,
user_present: user_present,
user_verified: user_verified,
sign_count: sign_count,
extensions: extensions,
allow_credentials: allow_credentials
)
{
"type" => "public-key",
"id" => internal_encoder.encode(assertion[:credential_id]),
"rawId" => encoder.encode(assertion[:credential_id]),
"clientExtensionResults" => extensions,
"response" => {
"clientDataJSON" => encoder.encode(client_data_json),
"authenticatorData" => encoder.encode(assertion[:authenticator_data]),
"signature" => encoder.encode(assertion[:signature]),
"userHandle" => user_handle ? encoder.encode(user_handle) : nil
}
}
end
private
attr_reader :authenticator, :encoding
def data_json_for(method, challenge)
data = {
type: type_for(method),
challenge: internal_encoder.encode(challenge),
origin: origin
}
if token_binding
data[:tokenBinding] = token_binding
end
data.to_json
end
def encoder
@encoder ||= WebAuthn::Encoder.new(encoding)
end
def internal_encoder
WebAuthn.standard_encoder
end
def hashed(data)
OpenSSL::Digest::SHA256.digest(data)
end
def fake_challenge
encoder.encode(SecureRandom.random_bytes(32))
end
def fake_origin
"http://localhost#{rand(1000)}.test"
end
def type_for(method)
TYPES[method]
end
end
end
|
