acc_certcheck.hpp

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//    OpenVPN -- An application to securely tunnel IP networks
//               over a single port, with support for SSL/TLS-based
//               session authentication and key exchange,
//               packet encryption, packet authentication, and
//               packet compression.
//
//    Copyright (C) 2012- OpenVPN Inc.
//
//    SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
 
#pragma once
 
#include <string>
#include <memory>
#include <optional>
#include <stdexcept>
 
#include <openvpn/buffer/buffer.hpp>
#include <openvpn/ssl/sslchoose.hpp>
#include <openvpn/ssl/sslapi.hpp>
 
namespace openvpn {
 
struct SslApiBuilder
{
    SslApiBuilder(SSLLib::SSLAPI::Config::Ptr cfg)
        : mConfig(std::move(cfg)),
          mFactory(mConfig->new_factory()),
          mServer(mFactory->ssl()) {};
 
    SslApiBuilder(const SslApiBuilder &) = delete;
    SslApiBuilder(SslApiBuilder &&) noexcept = delete;
    SslApiBuilder &operator=(const SslApiBuilder &) = delete;
    SslApiBuilder &operator=(SslApiBuilder &&) = delete;
 
  public: // API
    openvpn::SSLAPI &get()
    {
        return *mServer;
    }
 
  private:                                // Data
    SSLLib::SSLAPI::Config::Ptr mConfig;  
    openvpn::SSLFactoryAPI::Ptr mFactory; 
    openvpn::SSLAPI::Ptr mServer;         
};
struct AccHandshaker
{
    using MsgT = std::optional<std::string>;
    AccHandshaker() = default;
    AccHandshaker(SSLLib::SSLAPI::Config::Ptr cfg);
    MsgT process_msg(const MsgT &msg);
    std::string details();
    void reset(SSLLib::SSLAPI::Config::Ptr cfg);
 
  private:
    std::unique_ptr<SslApiBuilder> mSslApi;
};
inline AccHandshaker::AccHandshaker(SSLLib::SSLAPI::Config::Ptr cfg)
    : mSslApi(new SslApiBuilder(std::move(cfg)))
{
    mSslApi->get().start_handshake();
}
inline AccHandshaker::MsgT AccHandshaker::process_msg(const MsgT &msg)
{
    if (!mSslApi)
        throw std::runtime_error("AccHandshaker::process_msg: not configured");
 
    MsgT ret = std::nullopt;
    auto &api = mSslApi->get();
    if (msg)
    {
        api.write_ciphertext(BufferAllocatedRc::Create(reinterpret_cast<const unsigned char *>(msg->c_str()),
                                                       msg->size(),
                                                       BufAllocFlags::NO_FLAGS));
 
        // Won't handshake without this even though there is no data available.
        uint8_t cleartext[8];
        api.read_cleartext(cleartext, sizeof(cleartext));
    }
 
    if (api.read_ciphertext_ready())
    {
        auto reply = api.read_ciphertext();
        ret = {reinterpret_cast<const char *>(reply->c_data()),
               reinterpret_cast<const char *>(reply->c_data_end())};
    }
 
    return ret;
}
inline std::string AccHandshaker::details()
{
    if (!mSslApi)
        throw std::runtime_error("AccHandshaker::details: not configured");
 
    return mSslApi->get().ssl_handshake_details();
}
inline void AccHandshaker::reset(SSLLib::SSLAPI::Config::Ptr cfg)
{
    mSslApi.reset(new SslApiBuilder(std::move(cfg)));
    mSslApi->get().start_handshake();
}
 
} // namespace openvpn