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authenticator_common.cc
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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 "content/browser/webauth/authenticator_common.h"
#include <array>
#include <string>
#include <utility>
#include <vector>
#include "base/base64url.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/check.h"
#include "base/command_line.h"
#include "base/containers/contains.h"
#include "base/metrics/histogram_macros.h"
#include "base/notreached.h"
#include "base/rand_util.h"
#include "base/strings/string_piece.h"
#include "base/strings/utf_string_conversion_utils.h"
#include "base/timer/timer.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "content/browser/bad_message.h"
#include "content/browser/renderer_host/back_forward_cache_disable.h"
#include "content/browser/webauth/authenticator_environment_impl.h"
#include "content/browser/webauth/client_data_json.h"
#include "content/browser/webauth/is_uvpaa.h"
#include "content/browser/webauth/virtual_authenticator_manager_impl.h"
#include "content/browser/webauth/virtual_fido_discovery_factory.h"
#include "content/browser/webauth/webauth_request_security_checker.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/device_service.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "crypto/sha2.h"
#include "device/base/features.h"
#include "device/fido/attestation_statement.h"
#include "device/fido/ctap_make_credential_request.h"
#include "device/fido/features.h"
#include "device/fido/fido_authenticator.h"
#include "device/fido/fido_constants.h"
#include "device/fido/fido_parsing_utils.h"
#include "device/fido/fido_transport_protocol.h"
#include "device/fido/fido_types.h"
#include "device/fido/filter.h"
#include "device/fido/get_assertion_request_handler.h"
#include "device/fido/make_credential_request_handler.h"
#include "device/fido/public_key.h"
#include "device/fido/public_key_credential_descriptor.h"
#include "device/fido/public_key_credential_params.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/cert/asn1_util.h"
#include "net/der/input.h"
#include "net/der/parse_values.h"
#include "net/der/parser.h"
#include "services/network/public/cpp/is_potentially_trustworthy.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/url_constants.h"
#include "url/url_util.h"
#if BUILDFLAG(IS_MAC)
#include "device/fido/mac/authenticator.h"
#include "device/fido/mac/credential_metadata.h"
#endif
#if BUILDFLAG(IS_CHROMEOS)
#include "device/fido/cros/authenticator.h"
#endif
namespace content {
// RequestExtension is a type of extension in a WebAuthn request that might
// yield an extension output in the response.
enum class RequestExtension {
kAppID,
kHMACSecret,
kPRF,
kCredProps,
kLargeBlobEnable,
kLargeBlobRead,
kLargeBlobWrite,
kCredBlob,
kGetCredBlob,
kMinPINLength,
};
namespace {
WebAuthenticationDelegate* GetWebAuthenticationDelegate() {
return GetContentClient()->browser()->GetWebAuthenticationDelegate();
}
std::string Base64UrlEncode(const base::span<const uint8_t> input) {
std::string ret;
base::Base64UrlEncode(
base::StringPiece(reinterpret_cast<const char*>(input.data()),
input.size()),
base::Base64UrlEncodePolicy::OMIT_PADDING, &ret);
return ret;
}
// Returns an App ID string if a U2F credential must be made for the request
// with |options|. This is the case for requests that either originate from
// cryptotoken or have the googleLegacyAppidSupport extension set.
absl::optional<std::string> MakeCredentialU2fAppIdOverride(
const url::Origin& caller_origin,
const blink::mojom::PublicKeyCredentialCreationOptionsPtr& options) {
// Cryptotoken passes the U2F request's App ID in the RP ID field of the
// WebAuthn request.
if (WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin)) {
DCHECK(!options->google_legacy_app_id_support);
return options->relying_party.id;
}
if (options->google_legacy_app_id_support &&
options->relying_party.id == "google.com") {
if (caller_origin.DomainIs("login.corp.google.com")) {
return WebAuthRequestSecurityChecker::kGstaticCorpAppId;
}
return WebAuthRequestSecurityChecker::kGstaticAppId;
}
return absl::nullopt;
}
// The application parameter is the SHA-256 hash of the UTF-8 encoding of
// the application identity (i.e. relying_party_id) of the application
// requesting the registration.
std::array<uint8_t, crypto::kSHA256Length> CreateApplicationParameter(
const std::string& relying_party_id) {
std::array<uint8_t, crypto::kSHA256Length> application_parameter;
crypto::SHA256HashString(relying_party_id, application_parameter.data(),
application_parameter.size());
return application_parameter;
}
device::CtapGetAssertionRequest CreateCtapGetAssertionRequest(
const std::string& client_data_json,
const blink::mojom::PublicKeyCredentialRequestOptionsPtr& options,
absl::optional<std::string> app_id,
bool is_off_the_record) {
device::CtapGetAssertionRequest request_parameter(options->relying_party_id,
client_data_json);
request_parameter.allow_list = options->allow_credentials;
request_parameter.user_verification = options->user_verification;
if (app_id) {
request_parameter.alternative_application_parameter =
CreateApplicationParameter(*app_id);
request_parameter.app_id = std::move(*app_id);
}
if (!options->cable_authentication_data.empty()) {
request_parameter.cable_extension = options->cable_authentication_data;
}
if (options->large_blob_read) {
request_parameter.large_blob_read = true;
request_parameter.large_blob_key = true;
}
if (options->large_blob_write) {
request_parameter.large_blob_key = true;
}
request_parameter.is_off_the_record_context = is_off_the_record;
return request_parameter;
}
// Parses the FIDO transport types extension from the DER-encoded, X.509
// certificate in |der_cert| and appends any unique transport types found to
// |out_transports|.
void AppendUniqueTransportsFromCertificate(
base::span<const uint8_t> der_cert,
std::vector<device::FidoTransportProtocol>* out_transports) {
// See
// https://fidoalliance.org/specs/fido-u2f-v1.2-ps-20170411/fido-u2f-authenticator-transports-extension-v1.2-ps-20170411.html#fido-u2f-certificate-transports-extension
static constexpr uint8_t kTransportTypesOID[] = {
0x2b, 0x06, 0x01, 0x04, 0x01, 0x82, 0xe5, 0x1c, 0x02, 0x01, 0x01};
bool present, critical;
base::StringPiece contents;
if (!net::asn1::ExtractExtensionFromDERCert(
base::StringPiece(reinterpret_cast<const char*>(der_cert.data()),
der_cert.size()),
base::StringPiece(reinterpret_cast<const char*>(kTransportTypesOID),
sizeof(kTransportTypesOID)),
&present, &critical, &contents) ||
!present) {
return;
}
const net::der::Input contents_der(contents);
net::der::Parser contents_parser(contents_der);
absl::optional<net::der::BitString> transport_bits =
contents_parser.ReadBitString();
if (!transport_bits) {
return;
}
// The certificate extension contains a BIT STRING where different bits
// indicate support for different transports. The following array maps
// between these bit indexes and the FidoTransportProtocol enum.
static constexpr struct {
uint8_t bit_index;
device::FidoTransportProtocol transport;
} kTransportMapping[] = {
// Bit 0 is "Bluetooth Classic", not BLE. Since webauthn doesn't define a
// transport type for this we ignore it.
{1, device::FidoTransportProtocol::kBluetoothLowEnergy},
{2, device::FidoTransportProtocol::kUsbHumanInterfaceDevice},
{3, device::FidoTransportProtocol::kNearFieldCommunication},
{4, device::FidoTransportProtocol::kInternal},
};
for (const auto& mapping : kTransportMapping) {
if (transport_bits->AssertsBit(mapping.bit_index) &&
!base::Contains(*out_transports, mapping.transport)) {
out_transports->push_back(mapping.transport);
}
}
}
enum class AttestationErasureOption {
kIncludeAttestation,
kEraseAttestationButIncludeAaguid,
kEraseAttestationAndAaguid,
};
base::TimeDelta AdjustTimeout(absl::optional<base::TimeDelta> timeout,
RenderFrameHost* render_frame_host) {
// Time to wait for an authenticator to successfully complete an operation.
static constexpr base::TimeDelta kAdjustedTimeoutLower = base::Seconds(10);
static constexpr base::TimeDelta kAdjustedTimeoutUpper = base::Minutes(10);
if (!timeout) {
return kAdjustedTimeoutUpper;
}
const bool testing_api_enabled =
AuthenticatorEnvironmentImpl::GetInstance()
->IsVirtualAuthenticatorEnabledFor(
static_cast<RenderFrameHostImpl*>(render_frame_host)
->frame_tree_node());
if (testing_api_enabled) {
return *timeout;
}
return std::max(kAdjustedTimeoutLower,
std::min(kAdjustedTimeoutUpper, *timeout));
}
bool UsesDiscoverableCreds(const device::MakeCredentialOptions& options) {
return options.resident_key == device::ResidentKeyRequirement::kRequired;
}
bool UsesDiscoverableCreds(const device::CtapGetAssertionRequest& request) {
return request.allow_list.empty();
}
// GetWebAuthnTransports returns the set of transports that should be passed to
// a FidoRequestHandler for a WebAuthn request. This determines for which
// transports the request handler will attempt to obtain FidoDiscovery
// instances. This applies only to WebAuthn API requests. For U2F, see
// |GetU2FTransports|.
base::flat_set<device::FidoTransportProtocol> GetWebAuthnTransports(
RenderFrameHost* render_frame_host,
device::FidoDiscoveryFactory* discovery_factory,
bool uses_discoverable_creds) {
base::flat_set<device::FidoTransportProtocol> transports;
transports.insert(device::FidoTransportProtocol::kUsbHumanInterfaceDevice);
// Only instantiate platform discovery if the embedder hasn't chosen to
// override IsUserVerifyingPlatformAuthenticatorAvailable() to be false.
// Chrome disables platform authenticators in Guest modes this way.
absl::optional<bool> embedder_isuvpaa_override =
GetWebAuthenticationDelegate()
->IsUserVerifyingPlatformAuthenticatorAvailableOverride(
render_frame_host);
if (!embedder_isuvpaa_override || *embedder_isuvpaa_override) {
transports.insert(device::FidoTransportProtocol::kInternal);
}
if (discovery_factory->IsTestOverride()) {
// The desktop implementation does not support BLE or NFC, but we emulate
// them if the testing API is enabled.
transports.insert(device::FidoTransportProtocol::kBluetoothLowEnergy);
transports.insert(device::FidoTransportProtocol::kNearFieldCommunication);
// Ensure virtual platform authenticators can be instantiated even if they
// are not-user-verifying, i.e. IsUVPAA() returns false.
transports.insert(device::FidoTransportProtocol::kInternal);
}
if (base::FeatureList::IsEnabled(features::kWebAuthCable)) {
transports.insert(
device::FidoTransportProtocol::kCloudAssistedBluetoothLowEnergy);
}
// kAndroidAccessory doesn't work on Windows because of USB stack issues.
// Note: even if this value were inserted it wouldn't take effect on Windows
// versions with a native API because FidoRequestHandlerBase filters out
// non-kCloudAssistedBluetoothLowEnergy transports in that case.
#if !BUILDFLAG(IS_WIN)
// In order for AOA to be active the |AuthenticatorRequestClientDelegate|
// must still configure a |UsbDeviceManager|.
transports.insert(device::FidoTransportProtocol::kAndroidAccessory);
#endif
return transports;
}
// GetU2FTransports is like GetWebAuthnTransports but for requests that
// originate from Cryptotoken or use googleLegacyAppidSupport extension.
base::flat_set<device::FidoTransportProtocol> GetU2FTransports() {
return base::flat_set<device::FidoTransportProtocol>(
{device::FidoTransportProtocol::kUsbHumanInterfaceDevice});
}
// Returns a new FidoDiscoveryFactory for the current request. This may be
// a factory for virtual authenticators if the testing API is enabled for the
// given frame.
std::unique_ptr<device::FidoDiscoveryFactory> MakeDiscoveryFactory(
RenderFrameHost* render_frame_host,
bool is_u2f_api_request) {
VirtualAuthenticatorManagerImpl* virtual_authenticator_manager =
AuthenticatorEnvironmentImpl::GetInstance()
->MaybeGetVirtualAuthenticatorManager(
static_cast<RenderFrameHostImpl*>(render_frame_host)
->frame_tree_node());
if (virtual_authenticator_manager) {
return virtual_authenticator_manager->MakeDiscoveryFactory();
}
auto discovery_factory = std::make_unique<device::FidoDiscoveryFactory>();
#if BUILDFLAG(IS_MAC)
discovery_factory->set_mac_touch_id_info(
GetWebAuthenticationDelegate()->GetTouchIdAuthenticatorConfig(
render_frame_host->GetBrowserContext()));
#endif // BUILDFLAG(IS_MAC)
#if BUILDFLAG(IS_WIN)
if (base::FeatureList::IsEnabled(device::kWebAuthUseNativeWinApi)) {
discovery_factory->set_win_webauthn_api(
AuthenticatorEnvironmentImpl::GetInstance()->win_webauthn_api());
}
#endif // BUILDFLAG(IS_WIN)
#if BUILDFLAG(IS_CHROMEOS)
// Ignore the ChromeOS u2fd virtual U2F HID device for WebAuthn requests so
// that it doesn't collide with the ChromeOS platform authenticator, also
// implemented in u2fd.
if (base::FeatureList::IsEnabled(device::kWebAuthCrosPlatformAuthenticator) &&
!is_u2f_api_request) {
constexpr device::VidPid kChromeOsU2fdVidPid{0x18d1, 0x502c};
discovery_factory->set_hid_ignore_list({kChromeOsU2fdVidPid});
discovery_factory->set_generate_request_id_callback(
GetWebAuthenticationDelegate()->GetGenerateRequestIdCallback(
render_frame_host));
}
#endif // BUILDFLAG(IS_CHROMEOS)
return discovery_factory;
}
} // namespace
AuthenticatorCommon::AuthenticatorCommon(RenderFrameHost* render_frame_host)
: render_frame_host_id_(render_frame_host->GetGlobalId()),
security_checker_(static_cast<RenderFrameHostImpl*>(render_frame_host)
->GetWebAuthRequestSecurityChecker()) {
// Disable the back-forward cache for any document that makes WebAuthn
// requests. Pages using privacy-sensitive APIs are generally exempt from
// back-forward cache for now as a precaution.
BackForwardCache::DisableForRenderFrameHost(
render_frame_host,
BackForwardCacheDisable::DisabledReason(
BackForwardCacheDisable::DisabledReasonId::kWebAuthenticationAPI));
}
AuthenticatorCommon::~AuthenticatorCommon() = default;
std::unique_ptr<AuthenticatorRequestClientDelegate>
AuthenticatorCommon::MaybeCreateRequestDelegate() {
RenderFrameHostImpl* const render_frame_host_impl =
static_cast<RenderFrameHostImpl*>(GetRenderFrameHost());
std::unique_ptr<AuthenticatorRequestClientDelegate> delegate =
GetContentClient()->browser()->GetWebAuthenticationRequestDelegate(
render_frame_host_impl);
if (!delegate) {
return nullptr;
}
VirtualAuthenticatorManagerImpl* virtual_authenticator_manager =
AuthenticatorEnvironmentImpl::GetInstance()
->MaybeGetVirtualAuthenticatorManager(
render_frame_host_impl->frame_tree_node());
if (virtual_authenticator_manager) {
delegate->SetVirtualEnvironment(true);
if (!virtual_authenticator_manager->is_ui_enabled()) {
delegate->DisableUI();
}
}
return delegate;
}
void AuthenticatorCommon::StartMakeCredentialRequest(
bool allow_skipping_pin_touch) {
InitDiscoveryFactory(
/*is_u2f_api_request=*/make_credential_options_->make_u2f_api_credential);
request_delegate_->ConfigureCable(
caller_origin_, device::FidoRequestType::kMakeCredential,
base::span<const device::CableDiscoveryData>(), discovery_factory());
make_credential_options_->allow_skipping_pin_touch = allow_skipping_pin_touch;
base::flat_set<device::FidoTransportProtocol> transports =
make_credential_options_->make_u2f_api_credential
? GetU2FTransports()
: GetWebAuthnTransports(
GetRenderFrameHost(), discovery_factory(),
UsesDiscoverableCreds(*make_credential_options_));
request_handler_ = std::make_unique<device::MakeCredentialRequestHandler>(
discovery_factory(), transports, *ctap_make_credential_request_,
*make_credential_options_,
base::BindOnce(&AuthenticatorCommon::OnRegisterResponse,
weak_factory_.GetWeakPtr()));
request_delegate_->RegisterActionCallbacks(
base::BindOnce(&AuthenticatorCommon::OnCancelFromUI,
weak_factory_.GetWeakPtr()) /* cancel_callback */,
base::BindRepeating(
&AuthenticatorCommon::StartMakeCredentialRequest,
weak_factory_.GetWeakPtr(),
/*allow_skipping_pin_touch=*/false) /* start_over_callback */,
base::BindRepeating(
&device::FidoRequestHandlerBase::StartAuthenticatorRequest,
request_handler_->GetWeakPtr()) /* request_callback */,
base::BindRepeating(
&device::FidoRequestHandlerBase::PowerOnBluetoothAdapter,
request_handler_
->GetWeakPtr()) /* bluetooth_adapter_power_on_callback */);
request_handler_->set_observer(request_delegate_.get());
}
void AuthenticatorCommon::StartGetAssertionRequest(
bool allow_skipping_pin_touch) {
InitDiscoveryFactory(
/*is_u2f_api_request=*/WebAuthRequestSecurityChecker::
OriginIsCryptoTokenExtension(caller_origin_));
base::span<const device::CableDiscoveryData> cable_pairings;
if (ctap_get_assertion_request_->cable_extension && IsFocused()) {
cable_pairings = *ctap_get_assertion_request_->cable_extension;
}
request_delegate_->ConfigureCable(caller_origin_,
device::FidoRequestType::kGetAssertion,
cable_pairings, discovery_factory());
#if BUILDFLAG(IS_CHROMEOS)
discovery_factory()->set_get_assertion_request_for_legacy_credential_check(
*ctap_get_assertion_request_);
#endif
base::flat_set<device::FidoTransportProtocol> transports =
WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin_)
? GetU2FTransports()
: GetWebAuthnTransports(
GetRenderFrameHost(), discovery_factory(),
UsesDiscoverableCreds(*ctap_get_assertion_request_));
request_handler_ = std::make_unique<device::GetAssertionRequestHandler>(
discovery_factory(), transports, *ctap_get_assertion_request_,
*ctap_get_assertion_options_, allow_skipping_pin_touch,
base::BindOnce(&AuthenticatorCommon::OnSignResponse,
weak_factory_.GetWeakPtr()));
request_delegate_->RegisterActionCallbacks(
base::BindOnce(&AuthenticatorCommon::OnCancelFromUI,
weak_factory_.GetWeakPtr()) /* cancel_callback */,
base::BindRepeating(
&AuthenticatorCommon::StartGetAssertionRequest,
weak_factory_.GetWeakPtr(),
/*allow_skipping_pin_touch=*/false) /* start_over_callback */,
base::BindRepeating(
&device::FidoRequestHandlerBase::StartAuthenticatorRequest,
request_handler_->GetWeakPtr()) /* request_callback */,
base::BindRepeating(
&device::FidoRequestHandlerBase::PowerOnBluetoothAdapter,
request_handler_
->GetWeakPtr()) /* bluetooth_adapter_power_on_callback */);
request_handler_->set_observer(request_delegate_.get());
}
bool AuthenticatorCommon::IsFocused() const {
return GetRenderFrameHost()->IsActive() &&
GetWebAuthenticationDelegate()->IsFocused(
WebContents::FromRenderFrameHost(GetRenderFrameHost()));
}
void AuthenticatorCommon::OnLargeBlobCompressed(
uint64_t original_size,
data_decoder::DataDecoder::ResultOrError<mojo_base::BigBuffer> result) {
if (result.value) {
ctap_get_assertion_request_->large_blob_write = device::LargeBlob(
device::fido_parsing_utils::Materialize(*result.value), original_size);
}
StartGetAssertionRequest(/*allow_skipping_pin_touch=*/true);
}
void AuthenticatorCommon::OnLargeBlobUncompressed(
device::AuthenticatorGetAssertionResponse response,
data_decoder::DataDecoder::ResultOrError<mojo_base::BigBuffer> result) {
CompleteGetAssertionRequest(
blink::mojom::AuthenticatorStatus::SUCCESS,
CreateGetAssertionResponse(
std::move(response),
device::fido_parsing_utils::MaterializeOrNull(result.value)));
}
// mojom::Authenticator
void AuthenticatorCommon::MakeCredential(
url::Origin caller_origin,
blink::mojom::PublicKeyCredentialCreationOptionsPtr options,
blink::mojom::Authenticator::MakeCredentialCallback callback) {
if (has_pending_request_) {
if (WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin)) {
// Requests originating from cryptotoken will generally outlive any
// navigation events on the tab of the request's sender. Evict pending
// requests if cryptotoken sends a new one such that requests from before
// a navigation event do not prevent new requests. See
// https://crbug.com/935480.
CancelWithStatus(blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
} else {
std::move(callback).Run(
blink::mojom::AuthenticatorStatus::PENDING_REQUEST, nullptr, nullptr);
return;
}
}
has_pending_request_ = true;
DCHECK(make_credential_response_callback_.is_null());
make_credential_response_callback_ = std::move(callback);
BeginRequestTimeout(options->timeout);
if (options->remote_desktop_client_override) {
// WebAuthRequestSecurityChecker will validate whether use of the extension
// is authorized.
if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kWebAuthRemoteDesktopSupport)) {
mojo::ReportBadMessage("--webauthn-remote-desktop-support not enabled");
return;
}
}
WebAuthRequestSecurityChecker::RequestType request_type =
options->is_payment_credential_creation
? WebAuthRequestSecurityChecker::RequestType::kMakePaymentCredential
: WebAuthRequestSecurityChecker::RequestType::kMakeCredential;
bool is_cross_origin_iframe = false;
blink::mojom::AuthenticatorStatus status =
security_checker_->ValidateAncestorOrigins(caller_origin, request_type,
&is_cross_origin_iframe);
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteMakeCredentialRequest(status);
return;
}
if (!security_checker_->DeduplicateCredentialDescriptorListAndValidateLength(
&options->exclude_credentials)) {
mojo::ReportBadMessage("invalid exclude_credentials length");
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
return;
}
status = security_checker_->ValidateDomainAndRelyingPartyID(
caller_origin, options->relying_party.id, request_type,
options->remote_desktop_client_override);
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteMakeCredentialRequest(status);
return;
}
request_delegate_ = MaybeCreateRequestDelegate();
if (!request_delegate_) {
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::PENDING_REQUEST);
return;
}
caller_origin_ = caller_origin;
relying_party_id_ = options->relying_party.id;
absl::optional<std::string> appid_exclude;
if (options->appid_exclude) {
appid_exclude = "";
auto status = security_checker_->ValidateAppIdExtension(
*options->appid_exclude, caller_origin,
options->remote_desktop_client_override, &appid_exclude.value());
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteMakeCredentialRequest(status);
return;
}
// `ValidateAppidExtension` must have set a value to use. If not, it would
// be a security bug, so crashing seems appropriate here.
CHECK(!appid_exclude->empty());
}
// If there is an active webAuthenticationProxy extension, let it handle the
// request.
WebAuthenticationRequestProxy* proxy = GetWebAuthnRequestProxyIfActive();
if (proxy) {
if (options->remote_desktop_client_override) {
// Don't allow proxying of an already proxied request.
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
return;
}
options->remote_desktop_client_override =
blink::mojom::RemoteDesktopClientOverride::New(
/*origin=*/caller_origin_,
/*same_origin_with_ancestors=*/!is_cross_origin_iframe);
pending_proxied_request_id_ = proxy->SignalCreateRequest(
options,
base::BindOnce(&AuthenticatorCommon::OnMakeCredentialProxyResponse,
weak_factory_.GetWeakPtr()));
return;
}
// Let the embedder override the RP ID to use for the request. In practice
// this rewrites the RP ID that Chrome extensions use.
absl::optional<std::string> rp_id_override =
GetWebAuthenticationDelegate()->MaybeGetRelyingPartyIdOverride(
options->relying_party.id, caller_origin);
if (rp_id_override) {
options->relying_party.id = *rp_id_override;
relying_party_id_ = *rp_id_override;
}
request_delegate_->SetRelyingPartyId(relying_party_id_);
device::fido_filter::MaybeInitialize();
switch (device::fido_filter::Evaluate(
device::fido_filter::Operation::MAKE_CREDENTIAL, relying_party_id_,
/*device=*/absl::nullopt,
/*id=*/absl::nullopt)) {
case device::fido_filter::Action::ALLOW:
break;
case device::fido_filter::Action::NO_ATTESTATION:
// This will be handled by the request handler.
break;
case device::fido_filter::Action::BLOCK:
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
return;
}
if (options->user.icon_url) {
status = security_checker_->ValidateAPrioriAuthenticatedUrl(
*options->user.icon_url);
}
if (status == blink::mojom::AuthenticatorStatus::SUCCESS &&
options->relying_party.icon_url) {
status = security_checker_->ValidateAPrioriAuthenticatedUrl(
*options->relying_party.icon_url);
}
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
bad_message::ReceivedBadMessage(GetRenderFrameHost()->GetProcess(),
bad_message::AUTH_INVALID_ICON_URL);
CompleteMakeCredentialRequest(status);
return;
}
if (!IsFocused()) {
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::NOT_FOCUSED);
return;
}
const device::AuthenticatorSelectionCriteria
authenticator_selection_criteria =
options->authenticator_selection
? *options->authenticator_selection
: device::AuthenticatorSelectionCriteria();
make_credential_options_ =
device::MakeCredentialOptions(authenticator_selection_criteria);
const bool might_create_resident_key =
make_credential_options_->resident_key !=
device::ResidentKeyRequirement::kDiscouraged;
if (might_create_resident_key &&
!GetWebAuthenticationDelegate()->SupportsResidentKeys(
GetRenderFrameHost())) {
if (make_credential_options_->resident_key ==
device::ResidentKeyRequirement::kRequired) {
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::RESIDENT_CREDENTIALS_UNSUPPORTED);
return;
}
// Downgrade 'preferred' to 'discouraged'.
make_credential_options_->resident_key =
device::ResidentKeyRequirement::kDiscouraged;
}
// Reject any non-sensical credProtect extension values.
if ( // Can't require the default policy (or no policy).
(options->enforce_protection_policy &&
(options->protection_policy ==
blink::mojom::ProtectionPolicy::UNSPECIFIED ||
options->protection_policy == blink::mojom::ProtectionPolicy::NONE)) ||
// For non-resident keys, NONE doesn't make sense. (UV_OR_CRED_ID_REQUIRED
// does because, with CTAP 2.0, just because a resident key isn't
// _required_ doesn't mean that one won't be created and an RP might want
// credProtect to take effect if that happens.)
(!might_create_resident_key &&
options->protection_policy == blink::mojom::ProtectionPolicy::NONE) ||
// UV_REQUIRED only makes sense if UV is required overall.
(options->protection_policy ==
blink::mojom::ProtectionPolicy::UV_REQUIRED &&
authenticator_selection_criteria.user_verification_requirement !=
device::UserVerificationRequirement::kRequired)) {
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::PROTECTION_POLICY_INCONSISTENT);
return;
}
absl::optional<device::CredProtectRequest> cred_protect_request;
switch (options->protection_policy) {
case blink::mojom::ProtectionPolicy::UNSPECIFIED:
if (might_create_resident_key) {
// If not specified, kUVOrCredIDRequired is made the default unless
// the authenticator defaults to something better.
cred_protect_request =
device::CredProtectRequest::kUVOrCredIDRequiredOrBetter;
}
break;
case blink::mojom::ProtectionPolicy::NONE:
cred_protect_request = device::CredProtectRequest::kUVOptional;
break;
case blink::mojom::ProtectionPolicy::UV_OR_CRED_ID_REQUIRED:
cred_protect_request = device::CredProtectRequest::kUVOrCredIDRequired;
break;
case blink::mojom::ProtectionPolicy::UV_REQUIRED:
cred_protect_request = device::CredProtectRequest::kUVRequired;
break;
}
if (cred_protect_request) {
make_credential_options_->cred_protect_request = {
{*cred_protect_request, options->enforce_protection_policy}};
}
// Cryptotoken requests and Touch-to-Autofill should be proxied without UI.
const bool origin_is_crypto_token_extension =
WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin);
if (origin_is_crypto_token_extension || disable_ui_) {
request_delegate_->DisableUI();
}
// Assemble clientDataJSON.
ClientDataJsonParams client_data_json_params(
ClientDataRequestType::kWebAuthnCreate, caller_origin_,
options->challenge, is_cross_origin_iframe);
if (origin_is_crypto_token_extension) {
// Cryptotoken passes the real caller origin in |relying_party.name|.
client_data_json_params.type = ClientDataRequestType::kU2fRegister;
client_data_json_params.origin =
url::Origin::Create(GURL(*options->relying_party.name));
} else if (options->remote_desktop_client_override) {
client_data_json_params.origin =
options->remote_desktop_client_override->origin;
client_data_json_params.is_cross_origin_iframe =
!options->remote_desktop_client_override->same_origin_with_ancestors;
}
client_data_json_ = BuildClientDataJson(std::move(client_data_json_params));
ctap_make_credential_request_ = device::CtapMakeCredentialRequest(
client_data_json_, options->relying_party, options->user,
device::PublicKeyCredentialParams(options->public_key_parameters));
// If the request originates from CryptoToken or carries a valid
// googleLegacyAppidSupport extension, a U2F/CTAP1 credential bound to an
// AppID will be created.
const absl::optional<std::string> u2f_credential_app_id_override =
MakeCredentialU2fAppIdOverride(caller_origin, options);
if (u2f_credential_app_id_override) {
ctap_make_credential_request_->rp.id = *u2f_credential_app_id_override;
make_credential_options_->make_u2f_api_credential = true;
}
ctap_make_credential_request_->exclude_list = options->exclude_credentials;
if (options->prf_enable) {
requested_extensions_.insert(RequestExtension::kPRF);
ctap_make_credential_request_->hmac_secret = true;
}
if (options->hmac_create_secret) {
requested_extensions_.insert(RequestExtension::kHMACSecret);
ctap_make_credential_request_->hmac_secret = true;
}
if (options->cred_props) {
requested_extensions_.insert(RequestExtension::kCredProps);
}
if (options->large_blob_enable != device::LargeBlobSupport::kNotRequested) {
requested_extensions_.insert(RequestExtension::kLargeBlobEnable);
}
if (options->cred_blob) {
requested_extensions_.insert(RequestExtension::kCredBlob);
ctap_make_credential_request_->cred_blob = *options->cred_blob;
}
if (options->min_pin_length_requested) {
requested_extensions_.insert(RequestExtension::kMinPINLength);
ctap_make_credential_request_->min_pin_length_requested = true;
}
make_credential_options_->large_blob_support = options->large_blob_enable;
ctap_make_credential_request_->app_id_exclude = std::move(appid_exclude);
make_credential_options_->is_off_the_record_context =
GetBrowserContext()->IsOffTheRecord();
// Compute the effective attestation conveyance preference.
device::AttestationConveyancePreference attestation = options->attestation;
// Enterprise attestation should not have been approved by this point.
DCHECK(attestation !=
device::AttestationConveyancePreference::kEnterpriseApprovedByBrowser);
if (attestation == device::AttestationConveyancePreference::
kEnterpriseIfRPListedOnAuthenticator &&
GetWebAuthenticationDelegate()->ShouldPermitIndividualAttestation(
GetBrowserContext(), caller_origin,
u2f_credential_app_id_override.value_or(relying_party_id_))) {
attestation =
device::AttestationConveyancePreference::kEnterpriseApprovedByBrowser;
}
ctap_make_credential_request_->attestation_preference = attestation;
StartMakeCredentialRequest(/*allow_skipping_pin_touch=*/true);
}
void AuthenticatorCommon::GetAssertion(
url::Origin caller_origin,
blink::mojom::PublicKeyCredentialRequestOptionsPtr options,
blink::mojom::PaymentOptionsPtr payment_options,
blink::mojom::Authenticator::GetAssertionCallback callback) {
if (has_pending_request_) {
if (WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin)) {
// Requests originating from cryptotoken will generally outlive any
// navigation events on the tab of the request's sender. Evict pending
// requests if cryptotoken sends a new one such that requests from before
// a navigation event do not prevent new requests. See
// https://crbug.com/935480.
CancelWithStatus(blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
} else {
std::move(callback).Run(
blink::mojom::AuthenticatorStatus::PENDING_REQUEST, nullptr, nullptr);
return;
}
}
has_pending_request_ = true;
DCHECK(get_assertion_response_callback_.is_null());
get_assertion_response_callback_ = std::move(callback);
if (options->remote_desktop_client_override) {
// WebAuthRequestSecurityChecker will validate whether use of the extension
// is authorized.
if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kWebAuthRemoteDesktopSupport)) {
mojo::ReportBadMessage("--webauthn-remote-desktop-support not enabled");
return;
}
}
if (!options->is_conditional) {
BeginRequestTimeout(options->timeout);
}
WebAuthRequestSecurityChecker::RequestType request_type =
payment_options.is_null()
? WebAuthRequestSecurityChecker::RequestType::kGetAssertion
: WebAuthRequestSecurityChecker::RequestType::
kGetPaymentCredentialAssertion;
if (!payment_options.is_null() && options->allow_credentials.empty()) {
CompleteGetAssertionRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
NOTREACHED();
return;
}
bool is_cross_origin_iframe = false;
blink::mojom::AuthenticatorStatus status =
security_checker_->ValidateAncestorOrigins(caller_origin, request_type,
&is_cross_origin_iframe);
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteGetAssertionRequest(status);
return;
}
if (!security_checker_->DeduplicateCredentialDescriptorListAndValidateLength(
&options->allow_credentials)) {
mojo::ReportBadMessage("invalid allow_credentials length");
CompleteGetAssertionRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
return;
}
status = security_checker_->ValidateDomainAndRelyingPartyID(
caller_origin, options->relying_party_id, request_type,
options->remote_desktop_client_override);
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteGetAssertionRequest(status);
return;
}
request_delegate_ = MaybeCreateRequestDelegate();
if (!request_delegate_) {
CompleteGetAssertionRequest(
blink::mojom::AuthenticatorStatus::PENDING_REQUEST);
return;
}
caller_origin_ = caller_origin;
relying_party_id_ = options->relying_party_id;
if (options->appid) {
requested_extensions_.insert(RequestExtension::kAppID);
std::string app_id;
auto status = security_checker_->ValidateAppIdExtension(
*options->appid, caller_origin, options->remote_desktop_client_override,
&app_id);
if (status != blink::mojom::AuthenticatorStatus::SUCCESS) {
CompleteGetAssertionRequest(status);
return;
}
// `ValidateAppidExtension` must have set a value to use. If not, it would
// be a security bug, so crashing seems appropriate here.
CHECK(!app_id.empty());
app_id_ = app_id;
}
WebAuthenticationRequestProxy* proxy = GetWebAuthnRequestProxyIfActive();
if (proxy) {
if (options->remote_desktop_client_override) {
// Don't allow proxying of an already proxied request.
CompleteMakeCredentialRequest(
blink::mojom::AuthenticatorStatus::NOT_ALLOWED_ERROR);
return;
}
options->remote_desktop_client_override =
blink::mojom::RemoteDesktopClientOverride::New(
/*origin=*/caller_origin_,
/*same_origin_with_ancestors=*/!is_cross_origin_iframe);
pending_proxied_request_id_ = proxy->SignalGetRequest(
options,
base::BindOnce(&AuthenticatorCommon::OnGetAssertionProxyResponse,
weak_factory_.GetWeakPtr()));
return;
}
// Let the embedder override the RP ID to use for the request. In practice
// this rewrites the RP ID that Chrome extension use.
absl::optional<std::string> rp_id_override =
GetWebAuthenticationDelegate()->MaybeGetRelyingPartyIdOverride(
options->relying_party_id, caller_origin);
if (rp_id_override) {
options->relying_party_id = *rp_id_override;
relying_party_id_ = *rp_id_override;
}
request_delegate_->SetRelyingPartyId(relying_party_id_);
const bool origin_is_crypto_token_extension =
WebAuthRequestSecurityChecker::OriginIsCryptoTokenExtension(
caller_origin_);
// Assemble clientDataJSON.
ClientDataJsonParams client_data_json_params(
ClientDataRequestType::kWebAuthnGet, caller_origin, options->challenge,
is_cross_origin_iframe);
if (origin_is_crypto_token_extension) {
// Cryptotoken provides the sender origin for U2F sign requests in the
// |relying_party_id| attribute.
client_data_json_params.type = ClientDataRequestType::kU2fSign;
client_data_json_params.origin =
url::Origin::Create(GURL(options->relying_party_id));
} else if (payment_options) {
client_data_json_params.type = ClientDataRequestType::kPaymentGet;
client_data_json_params.payment_options = std::move(payment_options);
client_data_json_params.payment_rp = relying_party_id_;
client_data_json_params.payment_top_origin = GetRenderFrameHost()
->GetOutermostMainFrame()
->GetLastCommittedOrigin()
.Serialize();
} else if (options->remote_desktop_client_override) {
client_data_json_params.origin =
options->remote_desktop_client_override->origin;
client_data_json_params.is_cross_origin_iframe =