137 lines
5.0 KiB
C++
137 lines
5.0 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "AndroidRemotelyProvisionedComponentDevice.h"
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#include <assert.h>
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#include <variant>
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#include <cppbor.h>
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#include <cppbor_parse.h>
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#include <KeyMintUtils.h>
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#include <keymaster/cppcose/cppcose.h>
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#include <keymaster/keymaster_configuration.h>
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#include <openssl/bn.h>
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#include <openssl/ec.h>
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#include <openssl/rand.h>
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#include <openssl/x509.h>
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namespace aidl::android::hardware::security::keymint {
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using keymaster::GenerateCsrRequest;
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using keymaster::GenerateCsrResponse;
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using keymaster::GenerateRkpKeyRequest;
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using keymaster::GenerateRkpKeyResponse;
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using keymaster::KeymasterBlob;
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using ::std::string;
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using ::std::unique_ptr;
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using ::std::vector;
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using bytevec = ::std::vector<uint8_t>;
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namespace {
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constexpr auto STATUS_FAILED = IRemotelyProvisionedComponent::STATUS_FAILED;
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struct AStatusDeleter {
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void operator()(AStatus* p) { AStatus_delete(p); }
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};
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class Status {
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public:
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Status() : status_(AStatus_newOk()) {}
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Status(int32_t errCode, const std::string& errMsg)
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: status_(AStatus_fromServiceSpecificErrorWithMessage(errCode, errMsg.c_str())) {}
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explicit Status(const std::string& errMsg)
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: status_(AStatus_fromServiceSpecificErrorWithMessage(STATUS_FAILED, errMsg.c_str())) {}
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explicit Status(AStatus* status) : status_(status ? status : AStatus_newOk()) {}
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Status(Status&&) = default;
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Status(const Status&) = delete;
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operator ::ndk::ScopedAStatus() && { // NOLINT(google-explicit-constructor)
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return ndk::ScopedAStatus(status_.release());
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}
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bool isOk() const { return AStatus_isOk(status_.get()); }
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const char* getMessage() const { return AStatus_getMessage(status_.get()); }
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private:
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std::unique_ptr<AStatus, AStatusDeleter> status_;
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};
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} // namespace
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AndroidRemotelyProvisionedComponentDevice::AndroidRemotelyProvisionedComponentDevice(
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const std::shared_ptr<AndroidKeyMintDevice>& keymint) {
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impl_ = keymint->getKeymasterImpl();
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}
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ScopedAStatus AndroidRemotelyProvisionedComponentDevice::getHardwareInfo(RpcHardwareInfo* info) {
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info->versionNumber = 2;
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info->rpcAuthorName = "Google";
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info->supportedEekCurve = RpcHardwareInfo::CURVE_25519;
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info->uniqueId = "default keymint";
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return ScopedAStatus::ok();
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}
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ScopedAStatus AndroidRemotelyProvisionedComponentDevice::generateEcdsaP256KeyPair(
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bool testMode, MacedPublicKey* macedPublicKey, bytevec* privateKeyHandle) {
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GenerateRkpKeyRequest request(impl_->message_version());
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request.test_mode = testMode;
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GenerateRkpKeyResponse response(impl_->message_version());
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impl_->GenerateRkpKey(request, &response);
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if (response.error != KM_ERROR_OK) {
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return Status(-static_cast<int32_t>(response.error), "Failure in key generation.");
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}
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macedPublicKey->macedKey = km_utils::kmBlob2vector(response.maced_public_key);
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*privateKeyHandle = km_utils::kmBlob2vector(response.key_blob);
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return ScopedAStatus::ok();
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}
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ScopedAStatus AndroidRemotelyProvisionedComponentDevice::generateCertificateRequest(
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bool testMode, const vector<MacedPublicKey>& keysToSign, const bytevec& endpointEncCertChain,
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const bytevec& challenge, DeviceInfo* deviceInfo, ProtectedData* protectedData,
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bytevec* keysToSignMac) {
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GenerateCsrRequest request(impl_->message_version());
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request.test_mode = testMode;
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request.num_keys = keysToSign.size();
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request.keys_to_sign_array = new (std::nothrow) KeymasterBlob[keysToSign.size()];
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if (request.keys_to_sign_array == nullptr) {
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return km_utils::kmError2ScopedAStatus(KM_ERROR_MEMORY_ALLOCATION_FAILED);
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}
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for (size_t i = 0; i < keysToSign.size(); i++) {
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request.SetKeyToSign(i, keysToSign[i].macedKey.data(), keysToSign[i].macedKey.size());
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}
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request.SetEndpointEncCertChain(endpointEncCertChain.data(), endpointEncCertChain.size());
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request.SetChallenge(challenge.data(), challenge.size());
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GenerateCsrResponse response(impl_->message_version());
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impl_->GenerateCsr(request, &response);
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if (response.error != KM_ERROR_OK) {
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return Status(-static_cast<int32_t>(response.error), "Failure in CSR Generation.");
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}
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deviceInfo->deviceInfo = km_utils::kmBlob2vector(response.device_info_blob);
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protectedData->protectedData = km_utils::kmBlob2vector(response.protected_data_blob);
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*keysToSignMac = km_utils::kmBlob2vector(response.keys_to_sign_mac);
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return ScopedAStatus::ok();
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}
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} // namespace aidl::android::hardware::security::keymint
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