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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "AndroidRemotelyProvisionedComponentDevice.h"
#include <assert.h>
#include <variant>
#include <cppbor.h>
#include <cppbor_parse.h>
#include <KeyMintUtils.h>
#include <keymaster/cppcose/cppcose.h>
#include <keymaster/keymaster_configuration.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
namespace aidl::android::hardware::security::keymint {
using keymaster::GenerateCsrRequest;
using keymaster::GenerateCsrResponse;
using keymaster::GenerateCsrV2Request;
using keymaster::GenerateCsrV2Response;
using keymaster::GenerateRkpKeyRequest;
using keymaster::GenerateRkpKeyResponse;
using keymaster::GetHwInfoRequest;
using keymaster::GetHwInfoResponse;
using keymaster::KeymasterBlob;
using ::std::string;
using ::std::unique_ptr;
using ::std::vector;
using bytevec = ::std::vector<uint8_t>;
namespace {
constexpr auto STATUS_FAILED = IRemotelyProvisionedComponent::STATUS_FAILED;
struct AStatusDeleter {
void operator()(AStatus* p) { AStatus_delete(p); }
};
class Status {
public:
Status() : status_(AStatus_newOk()) {}
Status(int32_t errCode, const std::string& errMsg)
: status_(AStatus_fromServiceSpecificErrorWithMessage(errCode, errMsg.c_str())) {}
explicit Status(const std::string& errMsg)
: status_(AStatus_fromServiceSpecificErrorWithMessage(STATUS_FAILED, errMsg.c_str())) {}
explicit Status(AStatus* status) : status_(status ? status : AStatus_newOk()) {}
Status(Status&&) = default;
Status(const Status&) = delete;
operator ::ndk::ScopedAStatus() && { // NOLINT(google-explicit-constructor)
return ndk::ScopedAStatus(status_.release());
}
bool isOk() const { return AStatus_isOk(status_.get()); }
const char* getMessage() const { return AStatus_getMessage(status_.get()); }
private:
std::unique_ptr<AStatus, AStatusDeleter> status_;
};
} // namespace
AndroidRemotelyProvisionedComponentDevice::AndroidRemotelyProvisionedComponentDevice(
const std::shared_ptr<AndroidKeyMintDevice>& keymint) {
impl_ = keymint->getKeymasterImpl();
}
ScopedAStatus AndroidRemotelyProvisionedComponentDevice::getHardwareInfo(RpcHardwareInfo* info) {
GetHwInfoResponse response = impl_->GetHwInfo();
if (response.error != KM_ERROR_OK) {
return Status(-static_cast<int32_t>(response.error), "Failed to get hardware info.");
}
info->versionNumber = response.version;
info->rpcAuthorName = response.rpcAuthorName;
info->supportedEekCurve = response.supportedEekCurve;
info->uniqueId = response.uniqueId;
info->supportedNumKeysInCsr = response.supportedNumKeysInCsr;
return ScopedAStatus::ok();
}
ScopedAStatus AndroidRemotelyProvisionedComponentDevice::generateEcdsaP256KeyPair(
bool testMode, MacedPublicKey* macedPublicKey, bytevec* privateKeyHandle) {
GenerateRkpKeyRequest request(impl_->message_version());
request.test_mode = testMode;
GenerateRkpKeyResponse response(impl_->message_version());
impl_->GenerateRkpKey(request, &response);
if (response.error != KM_ERROR_OK) {
return Status(-static_cast<int32_t>(response.error), "Failure in key generation.");
}
macedPublicKey->macedKey = km_utils::kmBlob2vector(response.maced_public_key);
*privateKeyHandle = km_utils::kmBlob2vector(response.key_blob);
return ScopedAStatus::ok();
}
ScopedAStatus AndroidRemotelyProvisionedComponentDevice::generateCertificateRequest(
bool testMode, const vector<MacedPublicKey>& keysToSign, const bytevec& endpointEncCertChain,
const bytevec& challenge, DeviceInfo* deviceInfo, ProtectedData* protectedData,
bytevec* keysToSignMac) {
GenerateCsrRequest request(impl_->message_version());
request.test_mode = testMode;
request.num_keys = keysToSign.size();
request.keys_to_sign_array = new (std::nothrow) KeymasterBlob[keysToSign.size()];
if (request.keys_to_sign_array == nullptr) {
return km_utils::kmError2ScopedAStatus(KM_ERROR_MEMORY_ALLOCATION_FAILED);
}
for (size_t i = 0; i < keysToSign.size(); i++) {
request.SetKeyToSign(i, keysToSign[i].macedKey.data(), keysToSign[i].macedKey.size());
}
request.SetEndpointEncCertChain(endpointEncCertChain.data(), endpointEncCertChain.size());
request.SetChallenge(challenge.data(), challenge.size());
GenerateCsrResponse response(impl_->message_version());
impl_->GenerateCsr(request, &response);
if (response.error != KM_ERROR_OK) {
return Status(-static_cast<int32_t>(response.error), "Failure in CSR Generation.");
}
deviceInfo->deviceInfo = km_utils::kmBlob2vector(response.device_info_blob);
protectedData->protectedData = km_utils::kmBlob2vector(response.protected_data_blob);
*keysToSignMac = km_utils::kmBlob2vector(response.keys_to_sign_mac);
return ScopedAStatus::ok();
}
ScopedAStatus AndroidRemotelyProvisionedComponentDevice::generateCertificateRequestV2(
const std::vector<MacedPublicKey>& keysToSign, const std::vector<uint8_t>& challenge,
std::vector<uint8_t>* csr) {
GenerateCsrV2Request request(impl_->message_version());
if (!request.InitKeysToSign(keysToSign.size())) {
return km_utils::kmError2ScopedAStatus(static_cast<keymaster_error_t>(STATUS_FAILED));
}
for (size_t i = 0; i < keysToSign.size(); i++) {
request.SetKeyToSign(i, keysToSign[i].macedKey.data(), keysToSign[i].macedKey.size());
}
request.SetChallenge(challenge.data(), challenge.size());
GenerateCsrV2Response response(impl_->message_version());
impl_->GenerateCsrV2(request, &response);
if (response.error != KM_ERROR_OK) {
return Status(-static_cast<int32_t>(response.error), "Failure in CSR v2 generation.");
}
*csr = km_utils::kmBlob2vector(response.csr);
return ScopedAStatus::ok();
}
} // namespace aidl::android::hardware::security::keymint
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