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// Copyright 2018 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 "device/fido/get_assertion_task.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "device/base/features.h"
#include "device/fido/authenticator_get_assertion_response.h"
#include "device/fido/ctap2_device_operation.h"
#include "device/fido/ctap_empty_authenticator_request.h"
#include "device/fido/device_response_converter.h"
#include "device/fido/u2f_command_constructor.h"
#include "device/fido/u2f_sign_operation.h"
namespace device {
namespace {
bool ResponseContainsUserIdentifiableInfo(
const AuthenticatorGetAssertionResponse& response) {
const auto& user_entity = response.user_entity();
if (!user_entity)
return false;
return user_entity->user_display_name() || user_entity->user_name() ||
user_entity->user_icon_url();
}
} // namespace
GetAssertionTask::GetAssertionTask(FidoDevice* device,
CtapGetAssertionRequest request,
GetAssertionTaskCallback callback)
: FidoTask(device),
request_(std::move(request)),
callback_(std::move(callback)),
weak_factory_(this) {}
GetAssertionTask::~GetAssertionTask() = default;
void GetAssertionTask::StartTask() {
if (base::FeatureList::IsEnabled(kNewCtap2Device) &&
device()->supported_protocol() == ProtocolVersion::kCtap) {
GetAssertion();
} else {
U2fSign();
}
}
void GetAssertionTask::GetAssertion() {
sign_operation_ =
std::make_unique<Ctap2DeviceOperation<CtapGetAssertionRequest,
AuthenticatorGetAssertionResponse>>(
device(), request_,
base::BindOnce(&GetAssertionTask::OnCtapGetAssertionResponseReceived,
weak_factory_.GetWeakPtr()),
base::BindOnce(&ReadCTAPGetAssertionResponse));
sign_operation_->Start();
}
void GetAssertionTask::U2fSign() {
DCHECK(!device()->device_info());
DCHECK_EQ(ProtocolVersion::kU2f, device()->supported_protocol());
sign_operation_ = std::make_unique<U2fSignOperation>(
device(), request_,
base::BindOnce(&GetAssertionTask::OnCtapGetAssertionResponseReceived,
weak_factory_.GetWeakPtr()));
sign_operation_->Start();
}
bool GetAssertionTask::CheckRequirementsOnReturnedUserEntities(
const AuthenticatorGetAssertionResponse& response) {
// If assertion has been made without user verification, user identifiable
// information must not be included.
if (!response.auth_data().obtained_user_verification() &&
ResponseContainsUserIdentifiableInfo(response)) {
return false;
}
// For resident key credentials, user id of the user entity is mandatory.
if ((!request_.allow_list() || request_.allow_list()->empty()) &&
!response.user_entity()) {
return false;
}
// When multiple accounts exist for specified RP ID, user entity is mandatory.
if (response.num_credentials().value_or(0u) > 1 && !response.user_entity()) {
return false;
}
return true;
}
bool GetAssertionTask::CheckRequirementsOnReturnedCredentialId(
const AuthenticatorGetAssertionResponse& response) {
if (device()->device_info() &&
device()->device_info()->options().supports_resident_key()) {
return true;
}
const auto& allow_list = request_.allow_list();
return allow_list &&
(allow_list->size() == 1 ||
std::any_of(allow_list->cbegin(), allow_list->cend(),
[&response](const auto& credential) {
return credential.id() == response.raw_credential_id();
}));
}
void GetAssertionTask::OnCtapGetAssertionResponseReceived(
CtapDeviceResponseCode response_code,
base::Optional<AuthenticatorGetAssertionResponse> device_response) {
if (response_code != CtapDeviceResponseCode::kSuccess) {
std::move(callback_).Run(response_code, base::nullopt);
return;
}
// TODO(martinkr): CheckRpIdHash invocation needs to move into the Request
// handler. See https://crbug.com/863988.
if (!device_response || !device_response->CheckRpIdHash(request_.rp_id()) ||
!CheckRequirementsOnReturnedCredentialId(*device_response) ||
!CheckRequirementsOnReturnedUserEntities(*device_response)) {
std::move(callback_).Run(CtapDeviceResponseCode::kCtap2ErrOther,
base::nullopt);
return;
}
std::move(callback_).Run(response_code, std::move(device_response));
}
} // namespace device
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