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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/strings/string16.h"
#include "build/build_config.h"
#include "components/autofill/core/browser/autofill_client.h"
#include "components/autofill/core/browser/autofill_driver.h"
#include "components/autofill/core/browser/data_model/credit_card.h"
#include "components/autofill/core/browser/payments/fido_authentication_strike_database.h"
#include "components/autofill/core/browser/payments/full_card_request.h"
#include "components/autofill/core/browser/payments/payments_client.h"
#include "device/fido/fido_constants.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/mojom/webauthn/internal_authenticator.mojom.h"
namespace autofill {
using blink::mojom::AuthenticatorStatus;
using blink::mojom::GetAssertionAuthenticatorResponse;
using blink::mojom::GetAssertionAuthenticatorResponsePtr;
using blink::mojom::InternalAuthenticator;
using blink::mojom::MakeCredentialAuthenticatorResponse;
using blink::mojom::MakeCredentialAuthenticatorResponsePtr;
using blink::mojom::PublicKeyCredentialCreationOptions;
using blink::mojom::PublicKeyCredentialCreationOptionsPtr;
using blink::mojom::PublicKeyCredentialRequestOptions;
using blink::mojom::PublicKeyCredentialRequestOptionsPtr;
using device::AttestationConveyancePreference;
using device::AuthenticatorAttachment;
using device::AuthenticatorSelectionCriteria;
using device::CredentialType;
using device::FidoTransportProtocol;
using device::PublicKeyCredentialDescriptor;
using device::UserVerificationRequirement;
// Authenticates credit card unmasking through FIDO authentication, using the
// WebAuthn specification, standardized by the FIDO alliance. The Webauthn
// specification defines an API to cryptographically bind a server and client,
// and verify that binding. More information can be found here:
// -
// -
class CreditCardFIDOAuthenticator
: public payments::FullCardRequest::ResultDelegate {
// Useful for splitting metrics to correct sub-histograms and knowing which
// Payments RPC's to send.
enum Flow {
// No flow is in progress.
// Authentication flow.
// Registration flow, including a challenge to sign.
// Opt-in attempt flow, no challenge to sign.
// Opt-out flow.
// Authorization of a new card.
class Requester {
virtual ~Requester() {}
virtual void OnFIDOAuthenticationComplete(
bool did_succeed,
const CreditCard* card = nullptr) = 0;
CreditCardFIDOAuthenticator(AutofillDriver* driver, AutofillClient* client);
~CreditCardFIDOAuthenticator() override;
// Invokes Authentication flow. Responds to |accessor_| with full pan.
void Authenticate(const CreditCard* card,
base::WeakPtr<Requester> requester,
base::TimeTicks form_parsed_timestamp,
base::Value request_options);
// Invokes Registration flow. Sends credentials created from
// |creation_options| along with the |card_authorization_token| to Payments in
// order to enroll the user and authorize the corresponding card.
void Register(std::string card_authorization_token = std::string(),
base::Value creation_options = base::Value());
// Invokes an Authorization flow. Sends signature created from
// |request_options| along with the |card_authorization_token| to Payments in
// order to authorize the corresponding card.
void Authorize(std::string card_authorization_token,
base::Value request_options);
// Opts the user out.
void OptOut();
// Invokes callback with true if user has a verifying platform authenticator.
// e.g. Touch/Face ID, Windows Hello, Android fingerprint, etc., is available
// and enabled. Otherwise invokes callback with false.
virtual void IsUserVerifiable(base::OnceCallback<void(bool)> callback);
// Returns true only if the user has opted-in to use WebAuthn for autofill.
virtual bool IsUserOptedIn();
// Ensures that local user opt-in pref is in-sync with payments server.
void SyncUserOptIn(AutofillClient::UnmaskDetails& unmask_details);
// Cancel the ongoing verification process. Used to reset states in this class
// and in the FullCardRequest if any.
void CancelVerification();
#if !defined(OS_ANDROID)
// Invoked when a Webauthn offer dialog is about to be shown.
void OnWebauthnOfferDialogRequested(std::string card_authorization_token);
// Invoked when the WebAuthn offer dialog is accepted or declined/cancelled.
void OnWebauthnOfferDialogUserResponse(bool did_accept);
// Retrieves the strike database for offering FIDO authentication.
// Returns the current flow.
Flow current_flow() { return current_flow_; }
friend class AutofillManagerTest;
friend class CreditCardAccessManagerTest;
friend class CreditCardFIDOAuthenticatorTest;
friend class TestCreditCardFIDOAuthenticator;
// Invokes the WebAuthn prompt to request user verification to sign the
// challenge in |request_options|.
virtual void GetAssertion(
PublicKeyCredentialRequestOptionsPtr request_options);
// Invokes the WebAuthn prompt to request user verification to sign the
// challenge in |creation_options| and create a key-pair.
virtual void MakeCredential(
PublicKeyCredentialCreationOptionsPtr creation_options);
// Makes a request to payments to either opt-in or opt-out the user.
void OptChange(base::Value authenticator_response = base::Value());
// The callback invoked from the WebAuthn prompt including the
// |assertion_response|, which will be sent to Google Payments to retrieve
// card details.
void OnDidGetAssertion(
AuthenticatorStatus status,
GetAssertionAuthenticatorResponsePtr assertion_response);
// The callback invoked from the WebAuthn prompt including the
// |attestation_response|, which will be sent to Google Payments to enroll the
// credential for this user.
void OnDidMakeCredential(
AuthenticatorStatus status,
MakeCredentialAuthenticatorResponsePtr attestation_response);
// Sets prefstore to enable credit card authentication if rpc was successful.
void OnDidGetOptChangeResult(
AutofillClient::PaymentsRpcResult result,
payments::PaymentsClient::OptChangeResponseDetails& response);
// payments::FullCardRequest::ResultDelegate:
void OnFullCardRequestSucceeded(
const payments::FullCardRequest& full_card_request,
const CreditCard& card,
const base::string16& cvc) override;
void OnFullCardRequestFailed() override;
// Converts |request_options| from JSON to mojom pointer.
PublicKeyCredentialRequestOptionsPtr ParseRequestOptions(
const base::Value& request_options);
// Converts |creation_options| from JSON to mojom pointer.
PublicKeyCredentialCreationOptionsPtr ParseCreationOptions(
const base::Value& creation_options);
// Helper function to parse |key_info| sub-dictionary found in
// |request_options| and |creation_options|.
PublicKeyCredentialDescriptor ParseCredentialDescriptor(
const base::Value& key_info);
// Converts |assertion_response| from mojom pointer to JSON.
base::Value ParseAssertionResponse(
GetAssertionAuthenticatorResponsePtr assertion_response);
// Converts |attestation_response| from mojom pointer to JSON.
base::Value ParseAttestationResponse(
MakeCredentialAuthenticatorResponsePtr attestation_response);
// Returns true if |request_options| contains a challenge and has a non-empty
// list of keys that each have a Credential ID.
bool IsValidRequestOptions(const base::Value& request_options);
// Returns true if |request_options| contains a challenge.
bool IsValidCreationOptions(const base::Value& creation_options);
// Logs the result of a WebAuthn prompt.
void LogWebauthnResult(AuthenticatorStatus status);
// Card being unmasked.
const CreditCard* card_;
// The current flow in progress.
Flow current_flow_ = NONE_FLOW;
// Token used for authorizing new cards. Helps tie CVC auth and FIDO calls
// together in order to support FIDO-only unmasking on future attempts.
std::string card_authorization_token_;
// Meant for histograms recorded in FullCardRequest.
base::TimeTicks form_parsed_timestamp_;
// The associated autofill driver. Weak reference.
AutofillDriver* const autofill_driver_;
// The associated autofill client. Weak reference.
AutofillClient* const autofill_client_;
// Payments client to make requests to Google Payments.
payments::PaymentsClient* const payments_client_;
// Authenticator pointer to facilitate WebAuthn.
mojo::Remote<InternalAuthenticator> authenticator_;
// Responsible for getting the full card details, including the PAN and the
// CVC.
std::unique_ptr<payments::FullCardRequest> full_card_request_;
// Weak pointer to object that is requesting authentication.
base::WeakPtr<Requester> requester_;
// Strike database to ensure we limit the number of times we offer fido
// authentication.
// Signaled when callback for IsUserVerifiable() is invoked.
base::WaitableEvent user_is_verifiable_callback_received_;
base::WeakPtrFactory<CreditCardFIDOAuthenticator> weak_ptr_factory_{this};
} // namespace autofill