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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) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// OpenVPN 3 wrapper for kovpn crypto
#ifndef OPENVPN_KOVPN_KOREKEY_H
#define OPENVPN_KOVPN_KOREKEY_H
#include <openvpn/dco/kocrypto.hpp>
namespace openvpn {
namespace KoRekey {
class Receiver : public virtual RC<thread_unsafe_refcount>
{
public:
typedef RCPtr<Receiver> Ptr;
virtual void rekey(const CryptoDCInstance::RekeyType type,
const Info &info)
= 0;
virtual void explicit_exit_notify()
{
}
};
class Instance : public CryptoDCInstance
{
public:
Instance(const Receiver::Ptr &rcv_arg,
const CryptoDCContext::Ptr &dc_context_delegate,
const unsigned int key_id,
const Frame::Ptr &frame)
: rcv(rcv_arg),
info(dc_context_delegate, key_id, frame)
{
}
// Initialization
virtual unsigned int defined() const override
{
return CIPHER_DEFINED | HMAC_DEFINED | EXPLICIT_EXIT_NOTIFY_DEFINED;
}
virtual void init_cipher(StaticKey &&encrypt_key,
StaticKey &&decrypt_key) override
{
info.encrypt_cipher = std::move(encrypt_key);
info.decrypt_cipher = std::move(decrypt_key);
}
virtual void init_hmac(StaticKey &&encrypt_key,
StaticKey &&decrypt_key) override
{
info.encrypt_hmac = std::move(encrypt_key);
info.decrypt_hmac = std::move(decrypt_key);
}
virtual void init_pid(const int send_form,
const int recv_mode,
const int recv_form,
const char *recv_name,
const int recv_unit,
const SessionStats::Ptr &recv_stats_arg) override
{
info.tcp_linear = (recv_mode == PacketIDReceive::TCP_MODE);
}
virtual void init_remote_peer_id(const int remote_peer_id) override
{
info.remote_peer_id = remote_peer_id;
}
virtual bool consider_compression(const CompressContext &comp_ctx) override
{
info.comp_ctx = comp_ctx;
return false;
}
// Rekeying
virtual void rekey(const RekeyType type) override
{
rcv->rekey(type, info);
}
virtual void explicit_exit_notify() override
{
rcv->explicit_exit_notify();
}
// Encrypt/Decrypt -- data channel handled by kernel, so these methods
// should never be reached.
// returns true if packet ID is close to wrapping
virtual bool encrypt(BufferAllocated &buf, const PacketID::time_t now, const unsigned char *op32) override
{
throw korekey_error("encrypt");
}
virtual Error::Type decrypt(BufferAllocated &buf, const PacketID::time_t now, const unsigned char *op32) override
{
throw korekey_error("decrypt");
}
private:
Receiver::Ptr rcv;
Info info;
};
class Context : public CryptoDCContext
{
public:
Context(const CryptoAlgs::Type cipher,
const CryptoAlgs::Type digest,
const CryptoAlgs::KeyDerivation key_method,
CryptoDCFactory &dc_factory_delegate,
const Receiver::Ptr &rcv_arg,
const Frame::Ptr &frame_arg)
: CryptoDCContext(key_method),
rcv(rcv_arg),
dc_context_delegate(dc_factory_delegate.new_obj(cipher, digest, key_method)),
frame(frame_arg)
{
Key::validate(cipher, digest);
}
virtual CryptoDCInstance::Ptr new_obj(const unsigned int key_id) override
{
return new Instance(rcv, dc_context_delegate, key_id, frame);
}
// Info for ProtoContext::options_string
virtual Info crypto_info() override
{
return dc_context_delegate->crypto_info();
}
// Info for ProtoContext::link_mtu_adjust
virtual size_t encap_overhead() const override
{
return dc_context_delegate->encap_overhead();
}
private:
Receiver::Ptr rcv;
CryptoDCContext::Ptr dc_context_delegate;
Frame::Ptr frame;
};
class Factory : public CryptoDCFactory
{
public:
Factory(const CryptoDCFactory::Ptr &dc_factory_delegate_arg,
const Receiver::Ptr &rcv_arg,
const Frame::Ptr &frame_arg)
: dc_factory_delegate(dc_factory_delegate_arg),
rcv(rcv_arg),
frame(frame_arg)
{
}
virtual CryptoDCContext::Ptr new_obj(const CryptoAlgs::Type cipher,
const CryptoAlgs::Type digest,
const CryptoAlgs::KeyDerivation key_method) override
{
return new Context(cipher, digest, key_method, *dc_factory_delegate, rcv, frame);
}
private:
CryptoDCFactory::Ptr dc_factory_delegate;
Receiver::Ptr rcv;
Frame::Ptr frame;
};
} // namespace KoRekey
} // namespace openvpn
#endif
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