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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
//
// Wrap an OpenSSL DH object
#pragma once
#include <string>
#include <openvpn/common/size.hpp>
#include <openvpn/common/numeric_cast.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/openssl/util/error.hpp>
#if OPENSSL_VERSION_NUMBER < 0x30000000L
#include <openvpn/openssl/pki/dh-compat.hpp>
#else
namespace openvpn::OpenSSLPKI {
class DH
{
public:
DH()
: dh_(nullptr)
{
}
explicit DH(const std::string &dh_txt)
: dh_(nullptr)
{
parse_pem(dh_txt);
}
DH(const DH &other)
{
dup(other.dh_);
}
DH(DH &&other) noexcept
: dh_(other.dh_)
{
other.dh_ = nullptr;
}
void operator=(const DH &other)
{
if (this != &other)
{
erase();
dup(other.dh_);
}
}
DH &operator=(DH &&other) noexcept
{
if (this != &other)
{
erase();
dh_ = other.dh_;
other.dh_ = nullptr;
}
return *this;
}
bool defined() const
{
return dh_ != nullptr;
}
::EVP_PKEY *obj() const
{
return dh_;
}
/**
* Returns the object and also releases it, so this class will no longer
* reference it. E.g. for using it with a set0 method for OpenSSL
* @return
*/
::EVP_PKEY *obj_release()
{
auto dh = dh_;
dh_ = nullptr;
return dh;
}
void parse_pem(const std::string &dh_txt)
{
BIO *bio = ::BIO_new_mem_buf(const_cast<char *>(dh_txt.c_str()), numeric_cast<int>(dh_txt.length()));
if (!bio)
throw OpenSSLException();
::EVP_PKEY *dh = ::PEM_read_bio_Parameters_ex(bio, nullptr, nullptr, nullptr);
::BIO_free(bio);
if (!dh)
throw OpenSSLException("DH::parse_pem");
erase();
dh_ = dh;
}
std::string render_pem() const
{
if (dh_)
{
BIO *bio = ::BIO_new(BIO_s_mem());
const int ret = ::PEM_write_bio_Parameters(bio, dh_);
if (ret == 0)
{
::BIO_free(bio);
throw OpenSSLException("DH::render_pem");
}
{
char *temp;
const size_t buf_len = ::BIO_get_mem_data(bio, &temp);
std::string ret = std::string(temp, buf_len);
::BIO_free(bio);
return ret;
}
}
else
return "";
}
~DH()
{
erase();
}
private:
void erase()
{
if (dh_)
::EVP_PKEY_free(dh_);
}
void dup(const ::EVP_PKEY *dh)
{
if (dh)
dh_ = EVP_PKEY_dup(const_cast<EVP_PKEY *>(dh));
else
dh_ = nullptr;
}
::EVP_PKEY *dh_;
};
} // namespace openvpn::OpenSSLPKI
#endif
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