discourse/spec/lib/webauthn/security_key_registration_service_spec.rb

# frozen_string_literal: true
require 'webauthn'
require 'webauthn/security_key_registration_service'

describe Webauthn::SecurityKeyRegistrationService do
  let(:client_data_challenge) { Base64.encode64(challenge) }
  let(:client_data_webauthn_type) { 'webauthn.create' }
  let(:client_data_origin) { 'http://localhost:3000' }
  let(:client_data_param) {
    {
      challenge: client_data_challenge,
      type: client_data_webauthn_type,
      origin: client_data_origin
    }
  }
  ##
  # This attestation object was sourced by manually registering
  # a key with `navigator.credentials.create` and capturing the
  # results in localhost.
  let(:attestation) do
    "o2NmbXRkbm9uZWdhdHRTdG10oGhhdXRoRGF0YVjESZYN5YgOjGh0NBcPZHZgW4/krrmihjLHmVzzuoMdl2NBAAAAAAAAAAAAAAAAAAAAAAAAAAAAQFmvayWc8OPJ4jj4sevfxBmvUglDMZrFalyokYrdnqOVvudC0lQialaGQv72eBzJM2Qn1GfJI7lpBgFJMprisLSlAQIDJiABIVgg+23/BZux7LK0/KQgCiQGtdr51ar+vfTtHWpRtN17gOwiWCBstV918mugVBexg/rdZjTs0wN/upHFoyBiAJCaGVD8OA=="
  end
  let(:params) do
    {
      clientData: Base64.encode64(client_data_param.to_json),
      attestation: attestation,
      name: 'My Yubikey'
    }
  end
  ##
  # The above attestation was generated in localhost; Discourse.current_hostname
  # returns test.localhost which we do not want
  let(:rp_id) { 'localhost' }
  let(:challenge_params) do
    {
      challenge: challenge,
      rp_id: rp_id,
      origin: 'http://localhost:3000'
    }
  end
  let(:challenge) { 'f1e04530f34a1b6a08d032d8550e23eb8330be04e4166008f26c0e1b42ad' }
  let(:current_user) { Fabricate(:user) }
  let(:subject) { described_class.new(current_user, params, challenge_params) }

  context 'when the client data webauthn type is not webauthn.create' do
    let(:client_data_webauthn_type) { 'webauthn.explode' }

    it 'raises an InvalidTypeError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::InvalidTypeError, I18n.t('webauthn.validation.invalid_type_error')
      )
    end
  end

  context 'when the decoded challenge does not match the original challenge provided by the server' do
    let(:client_data_challenge) { Base64.encode64('invalid challenge') }

    it 'raises a ChallengeMismatchError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::ChallengeMismatchError, I18n.t('webauthn.validation.challenge_mismatch_error')
      )
    end
  end

  context 'when the origin of the client data does not match the server origin' do
    let(:client_data_origin) { 'https://someothersite.com' }

    it 'raises a InvalidOriginError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::InvalidOriginError, I18n.t('webauthn.validation.invalid_origin_error')
      )
    end
  end

  context 'when the sha256 hash of the relaying party ID does not match the one in attestation.authData' do
    let(:rp_id) { 'bad_rp_id' }

    it 'raises a InvalidRelyingPartyIdError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::InvalidRelyingPartyIdError, I18n.t('webauthn.validation.invalid_relying_party_id_error')
      )
    end
  end

  context 'when the public key algorithm is not supported by the server' do
    before do
      @original_supported_alg_value = Webauthn::SUPPORTED_ALGORITHMS
      silence_warnings do
        Webauthn::SUPPORTED_ALGORITHMS = [-999]
      end
    end

    it 'raises a UnsupportedPublicKeyAlgorithmError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::UnsupportedPublicKeyAlgorithmError, I18n.t('webauthn.validation.unsupported_public_key_algorithm_error')
      )
    end

    after do
      silence_warnings do
        Webauthn::SUPPORTED_ALGORITHMS = @original_supported_alg_value
      end
    end
  end

  context 'when the attestation format is not supported' do
    before do
      @original_supported_alg_value = Webauthn::VALID_ATTESTATION_FORMATS
      silence_warnings do
        Webauthn::VALID_ATTESTATION_FORMATS = ['err']
      end
    end

    it 'raises a UnsupportedAttestationFormatError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::UnsupportedAttestationFormatError, I18n.t('webauthn.validation.unsupported_attestation_format_error')
      )
    end

    after do
      silence_warnings do
        Webauthn::VALID_ATTESTATION_FORMATS = @original_supported_alg_value
      end
    end
  end

  context 'when the credential id is already in use for any user' do
    it 'raises a CredentialIdInUseError' do
      # register the key to the current user
      security_key = subject.register_second_factor_security_key

      # update the key to be on a different user
      other_user = Fabricate(:user)
      security_key.update(user: other_user)

      # error!
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::CredentialIdInUseError, I18n.t('webauthn.validation.credential_id_in_use_error')
      )
    end
  end

  context 'when the attestation data is malformed' do
    let(:attestation) do
      "blah/krrmihjLHmVzzuoMdl2NBAAAAAAAAAAAAAAAAAAAAAAAAAAAAQFmvayWc8OPJ4jj4sevfxBmvUglDMZrFalyokYrdnqOVvudC0lQialaGQv72eBzJM2Qn1GfJI7lpBgFJMprisLSlAQIDJiABIVgg+23/BZux7LK0/KQgCiQGtdr51ar+vfTtHWpRtN17gOwiWCBstV918mugVBexg/rdZjTs0wN/upHFoyBiAJCaGVD8OA=="
    end

    it 'raises a MalformedAttestationError' do
      expect { subject.register_second_factor_security_key }.to raise_error(
        Webauthn::MalformedAttestationError, I18n.t('webauthn.validation.malformed_attestation_error')
      )
    end
  end
end