libs/binder/tests/RpcCertificateVerifierSimple.h

/*
 * 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.
 */

#pragma once

#include <mutex>
#include <string_view>
#include <vector>

#include <openssl/ssl.h>

#include <binder/CertificateFormat.h>
#include <binder/RpcCertificateVerifier.h>

namespace android {

// A simple certificate verifier for testing.
// Keep a list of leaf certificates as trusted. No certificate chain support.
//
// All APIs are thread-safe. However, if verify() and addTrustedPeerCertificate() are called
// simultaneously in different threads, it is not deterministic whether verify() will use the
// certificate being added.
class RpcCertificateVerifierSimple : public RpcCertificateVerifier {
public:
    status_t verify(const X509*, uint8_t*) override;

    // Add a trusted peer certificate. Peers presenting this certificate are accepted.
    //
    // Caller must ensure that RpcTransportCtx::newTransport() are called after all trusted peer
    // certificates are added. Otherwise, RpcTransport-s created before may not trust peer
    // certificates added later.
    [[nodiscard]] status_t addTrustedPeerCertificate(CertificateFormat format,
                                                     const std::vector<uint8_t>& cert);

private:
    std::mutex mMutex; // for below
    std::vector<bssl::UniquePtr<X509>> mTrustedPeerCertificates;
};

} // namespace android