59 lines
2.4 KiB
Ruby
59 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Webauthn
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class AuthenticateService < BaseService
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def initialize(user, device_response, challenge)
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@user = user
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@device_response = device_response
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@challenge = challenge
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end
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def execute
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parsed_device_response = Gitlab::Json.parse(@device_response)
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webauthn_credential = WebAuthn::Credential.from_get(parsed_device_response)
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encoded_raw_id = Base64.strict_encode64(webauthn_credential.raw_id)
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stored_webauthn_credential = @user.webauthn_registrations.find_by_credential_xid(encoded_raw_id)
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encoder = WebAuthn.configuration.encoder
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if stored_webauthn_credential &&
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validate_webauthn_credential(webauthn_credential) &&
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verify_webauthn_credential(webauthn_credential, stored_webauthn_credential, @challenge, encoder)
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stored_webauthn_credential.update!(counter: webauthn_credential.sign_count)
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return true
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end
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false
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rescue JSON::ParserError, WebAuthn::SignCountVerificationError, WebAuthn::Error
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false
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end
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##
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# Validates that webauthn_credential is syntactically valid
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#
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# duplicated from WebAuthn::PublicKeyCredential#verify
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# which can't be used here as we need to call WebAuthn::AuthenticatorAssertionResponse#verify instead
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# (which is done in #verify_webauthn_credential)
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def validate_webauthn_credential(webauthn_credential)
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webauthn_credential.type == WebAuthn::TYPE_PUBLIC_KEY &&
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webauthn_credential.raw_id && webauthn_credential.id &&
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webauthn_credential.raw_id == WebAuthn.standard_encoder.decode(webauthn_credential.id)
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end
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##
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# Verifies that webauthn_credential matches stored_credential with the given challenge
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#
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def verify_webauthn_credential(webauthn_credential, stored_credential, challenge, encoder)
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# We need to adjust the relaying party id (RP id) we verify against if the registration in question
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# is a migrated U2F registration. This is beacuse the appid of U2F and the rp id of WebAuthn differ.
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rp_id = webauthn_credential.client_extension_outputs['appid'] ? WebAuthn.configuration.origin : URI(WebAuthn.configuration.origin).host
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webauthn_credential.response.verify(
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encoder.decode(challenge),
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public_key: encoder.decode(stored_credential.public_key),
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sign_count: stored_credential.counter,
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rp_id: rp_id)
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end
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end
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end
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