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/*
* Copyright 2019, 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.
*/
#define LOG_TAG "IdentityCredentialStore"
#include <android-base/logging.h>
#include <android/binder_manager.h>
#include "IdentityCredential.h"
#include "IdentityCredentialStore.h"
#include "PresentationSession.h"
#include "WritableIdentityCredential.h"
namespace aidl::android::hardware::identity {
using ::aidl::android::hardware::security::keymint::IRemotelyProvisionedComponent;
IdentityCredentialStore::IdentityCredentialStore(sp<SecureHardwareProxyFactory> hwProxyFactory,
optional<string> remotelyProvisionedComponent)
: hwProxyFactory_(hwProxyFactory),
remotelyProvisionedComponentName_(remotelyProvisionedComponent) {
hardwareInformation_.credentialStoreName = "Identity Credential Reference Implementation";
hardwareInformation_.credentialStoreAuthorName = "Google";
hardwareInformation_.dataChunkSize = kGcmChunkSize;
hardwareInformation_.isDirectAccess = false;
hardwareInformation_.supportedDocTypes = {};
hardwareInformation_.isRemoteKeyProvisioningSupported =
remotelyProvisionedComponentName_.has_value();
}
ndk::ScopedAStatus IdentityCredentialStore::getHardwareInformation(
HardwareInformation* hardwareInformation) {
*hardwareInformation = hardwareInformation_;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus IdentityCredentialStore::createCredential(
const string& docType, bool testCredential,
shared_ptr<IWritableIdentityCredential>* outWritableCredential) {
sp<SecureHardwareProvisioningProxy> hwProxy = hwProxyFactory_->createProvisioningProxy();
shared_ptr<WritableIdentityCredential> wc =
ndk::SharedRefBase::make<WritableIdentityCredential>(hwProxy, docType, testCredential,
hardwareInformation_);
if (!wc->initialize()) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_FAILED,
"Error initializing WritableIdentityCredential"));
}
*outWritableCredential = wc;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus IdentityCredentialStore::getCredential(
CipherSuite cipherSuite, const vector<uint8_t>& credentialData,
shared_ptr<IIdentityCredential>* outCredential) {
// We only support CIPHERSUITE_ECDHE_HKDF_ECDSA_WITH_AES_256_GCM_SHA256 right now.
if (cipherSuite != CipherSuite::CIPHERSUITE_ECDHE_HKDF_ECDSA_WITH_AES_256_GCM_SHA256) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_CIPHER_SUITE_NOT_SUPPORTED,
"Unsupported cipher suite"));
}
shared_ptr<IdentityCredential> credential = ndk::SharedRefBase::make<IdentityCredential>(
hwProxyFactory_, credentialData, nullptr /* session */, hardwareInformation_);
auto ret = credential->initialize();
if (ret != IIdentityCredentialStore::STATUS_OK) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
int(ret), "Error initializing IdentityCredential"));
}
*outCredential = credential;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus IdentityCredentialStore::createPresentationSession(
CipherSuite cipherSuite, shared_ptr<IPresentationSession>* outSession) {
// We only support CIPHERSUITE_ECDHE_HKDF_ECDSA_WITH_AES_256_GCM_SHA256 right now.
if (cipherSuite != CipherSuite::CIPHERSUITE_ECDHE_HKDF_ECDSA_WITH_AES_256_GCM_SHA256) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_CIPHER_SUITE_NOT_SUPPORTED,
"Unsupported cipher suite"));
}
sp<SecureHardwareSessionProxy> hwProxy = hwProxyFactory_->createSessionProxy();
shared_ptr<PresentationSession> session = ndk::SharedRefBase::make<PresentationSession>(
hwProxyFactory_, hwProxy, hardwareInformation_);
auto ret = session->initialize();
if (ret != IIdentityCredentialStore::STATUS_OK) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
int(ret), "Error initializing PresentationSession"));
}
*outSession = session;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus IdentityCredentialStore::getRemotelyProvisionedComponent(
shared_ptr<IRemotelyProvisionedComponent>* outRemotelyProvisionedComponent) {
if (!remotelyProvisionedComponentName_) {
return ndk::ScopedAStatus(AStatus_fromExceptionCodeWithMessage(
EX_UNSUPPORTED_OPERATION, "Remote key provisioning is not supported"));
}
ndk::SpAIBinder binder(
AServiceManager_waitForService(remotelyProvisionedComponentName_->c_str()));
if (binder.get() == nullptr) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_FAILED,
"Unable to get remotely provisioned component"));
}
*outRemotelyProvisionedComponent = IRemotelyProvisionedComponent::fromBinder(binder);
return ndk::ScopedAStatus::ok();
}
} // namespace aidl::android::hardware::identity
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