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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/enterprise/connectors/device_trust/device_trust_service.h"
#include "base/base64.h"
#include "base/values.h"
#include "chrome/browser/enterprise/connectors/device_trust/attestation/common/attestation_service.h"
#include "chrome/browser/enterprise/connectors/device_trust/attestation/common/attestation_utils.h"
#include "chrome/browser/enterprise/connectors/device_trust/attestation/common/signals_type.h"
#include "chrome/browser/enterprise/connectors/device_trust/common/common_types.h"
#include "chrome/browser/enterprise/connectors/device_trust/common/metrics_utils.h"
#include "chrome/browser/enterprise/connectors/device_trust/device_trust_connector_service.h"
#include "chrome/browser/enterprise/connectors/device_trust/signals/signals_service.h"
#include "components/enterprise/connectors/core/connectors_prefs.h"
#include "components/prefs/pref_service.h"
namespace enterprise_connectors {
namespace {
// Runs the `callback` to return the `result` from the data decoder
// service after it is validated and decoded.
void OnJsonParsed(DeviceTrustService::ParseJsonChallengeCallback callback,
data_decoder::DataDecoder::ValueOrError result) {
if (!result.has_value()) {
std::move(callback).Run(std::string());
return;
}
// Check if json is malformed or it doesn't include the needed field.
const std::string* challenge = result->GetDict().FindString("challenge");
if (!challenge) {
std::move(callback).Run(std::string());
return;
}
std::string serialized_signed_challenge;
if (!base::Base64Decode(*challenge, &serialized_signed_challenge)) {
std::move(callback).Run(std::string());
return;
}
std::move(callback).Run(serialized_signed_challenge);
return;
}
DeviceTrustResponse CreateFailedResponse(DeviceTrustError error) {
DeviceTrustResponse response;
response.error = error;
return response;
}
} // namespace
using CollectSignalsCallback = SignalsService::CollectSignalsCallback;
DeviceTrustService::DeviceTrustService(
std::unique_ptr<AttestationService> attestation_service,
std::unique_ptr<SignalsService> signals_service,
DeviceTrustConnectorService* connector)
: attestation_service_(std::move(attestation_service)),
signals_service_(std::move(signals_service)),
connector_(connector) {
DCHECK(attestation_service_);
DCHECK(signals_service_);
DCHECK(connector_);
}
DeviceTrustService::DeviceTrustService() = default;
DeviceTrustService::~DeviceTrustService() = default;
bool DeviceTrustService::IsEnabled() const {
return connector_ && connector_->IsConnectorEnabled();
}
void DeviceTrustService::BuildChallengeResponse(
const std::string& serialized_challenge,
const std::set<DTCPolicyLevel>& levels,
DeviceTrustCallback callback) {
ParseJsonChallenge(
serialized_challenge,
base::BindOnce(&DeviceTrustService::OnChallengeParsed,
weak_factory_.GetWeakPtr(), levels, std::move(callback)));
}
const std::set<DTCPolicyLevel> DeviceTrustService::Watches(
const GURL& url) const {
return connector_ ? connector_->Watches(url) : std::set<DTCPolicyLevel>();
}
void DeviceTrustService::ParseJsonChallenge(
const std::string& serialized_challenge,
ParseJsonChallengeCallback callback) {
data_decoder_.ParseJson(serialized_challenge,
base::BindOnce(&OnJsonParsed, std::move(callback)));
}
void DeviceTrustService::OnChallengeParsed(
const std::set<DTCPolicyLevel>& levels,
DeviceTrustCallback callback,
const std::string& challenge) {
if (challenge.empty()) {
// Failed to parse the challenge, fail early.
std::move(callback).Run(
CreateFailedResponse(DeviceTrustError::kFailedToParseChallenge));
return;
}
GetSignals(base::BindOnce(&DeviceTrustService::OnSignalsCollected,
weak_factory_.GetWeakPtr(), challenge, levels,
std::move(callback)));
}
void DeviceTrustService::GetSignals(CollectSignalsCallback callback) {
return signals_service_->CollectSignals(std::move(callback));
}
void DeviceTrustService::OnSignalsCollected(
const std::string& challenge,
const std::set<DTCPolicyLevel>& levels,
DeviceTrustCallback callback,
base::Value::Dict signals) {
LogAttestationFunnelStep(DTAttestationFunnelStep::kSignalsCollected);
attestation_service_->BuildChallengeResponseForVAChallenge(
challenge, std::move(signals), levels,
base::BindOnce(&DeviceTrustService::OnAttestationResponseReceived,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void DeviceTrustService::OnAttestationResponseReceived(
DeviceTrustCallback callback,
const AttestationResponse& attestation_response) {
LogAttestationResult(attestation_response.result_code);
DeviceTrustResponse dt_response{};
dt_response.challenge_response = attestation_response.challenge_response;
dt_response.attestation_result = attestation_response.result_code;
if (!IsSuccessAttestationResult(attestation_response.result_code)) {
dt_response.error = DeviceTrustError::kFailedToCreateResponse;
}
std::move(callback).Run(dt_response);
}
} // namespace enterprise_connectors
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