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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 EVP_PKEY object
#pragma once
#include <string>
#include <utility>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openvpn/common/size.hpp>
#include <openvpn/common/numeric_cast.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/openssl/util/error.hpp>
#include <openvpn/pki/pktype.hpp>
#include <openvpn/crypto/definitions.hpp>
#include <openvpn/openssl/compat.hpp>
namespace openvpn::OpenSSLPKI {
class PKey
{
public:
PKey()
: pkey_(nullptr)
{
}
PKey(const std::string &pkey_txt, const std::string &title, SSLLib::Ctx ctx)
: pkey_(nullptr)
{
parse_pem(pkey_txt, title, ctx);
}
PKey(const PKey &other)
: pkey_(dup(other.pkey_)),
priv_key_pwd(other.priv_key_pwd)
{
}
PKey(PKey &&other) noexcept
: pkey_(other.pkey_),
priv_key_pwd(std::move(other.priv_key_pwd))
{
other.pkey_ = nullptr;
}
PKey &operator=(const PKey &other)
{
if (this != &other)
{
erase();
pkey_ = dup(other.pkey_);
priv_key_pwd = other.priv_key_pwd;
}
return *this;
}
PKey &operator=(PKey &&other) noexcept
{
if (this != &other)
{
erase();
pkey_ = other.pkey_;
other.pkey_ = nullptr;
priv_key_pwd = std::move(other.priv_key_pwd);
}
return *this;
}
bool defined() const
{
return pkey_ != nullptr;
}
::EVP_PKEY *obj() const
{
return pkey_;
}
PKType::Type key_type() const
{
switch (::EVP_PKEY_id(pkey_))
{
case EVP_PKEY_RSA:
case EVP_PKEY_RSA2:
return PKType::PK_RSA;
case EVP_PKEY_EC:
return PKType::PK_EC;
case EVP_PKEY_DSA:
case EVP_PKEY_DSA1:
case EVP_PKEY_DSA2:
case EVP_PKEY_DSA3:
case EVP_PKEY_DSA4:
return PKType::PK_DSA;
case EVP_PKEY_NONE:
return PKType::PK_NONE;
default:
return PKType::PK_UNKNOWN;
}
}
size_t key_length() const
{
int ret = ::i2d_PrivateKey(pkey_, NULL);
if (ret < 0)
return 0;
/* convert to bits */
return ret * 8;
}
void set_private_key_password(const std::string &pwd)
{
priv_key_pwd = pwd;
}
void parse_pem(const std::string &pkey_txt, const std::string &title, SSLLib::Ctx libctx)
{
BIO *bio = ::BIO_new_mem_buf(const_cast<char *>(pkey_txt.c_str()), numeric_cast<int>(pkey_txt.length()));
if (!bio)
throw OpenSSLException();
::EVP_PKEY *pkey = ::PEM_read_bio_PrivateKey_ex(bio, nullptr, pem_password_callback, this, libctx, nullptr);
::BIO_free(bio);
if (!pkey)
throw OpenSSLException(std::string("PKey::parse_pem: error in ") + title + std::string(":"));
erase();
pkey_ = pkey;
}
std::string render_pem() const
{
if (pkey_)
{
BIO *bio = ::BIO_new(BIO_s_mem());
const int ret = ::PEM_write_bio_PrivateKey(bio, pkey_, nullptr, nullptr, 0, nullptr, nullptr);
if (ret == 0)
{
::BIO_free(bio);
throw OpenSSLException("PKey::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 "";
}
~PKey()
{
erase();
}
private:
static int pem_password_callback(char *buf, int size, int rwflag, void *userdata)
{
// get this
const PKey *self = (PKey *)userdata;
if (buf)
{
string::strncpynt(buf, self->priv_key_pwd.c_str(), size);
auto len = std::strlen(buf);
if (is_safe_conversion<int>(len))
return static_cast<int>(len);
}
return 0;
}
void erase()
{
if (pkey_)
::EVP_PKEY_free(pkey_);
}
#if OPENSSL_VERSION_NUMBER < 0x30000000L
static ::EVP_PKEY *dup(const ::EVP_PKEY *pkey)
{
// No OpenSSL EVP_PKEY_dup method so we roll our own
if (pkey)
{
::EVP_PKEY *pDupKey = ::EVP_PKEY_new();
::RSA *pRSA = ::EVP_PKEY_get1_RSA(const_cast<::EVP_PKEY *>(pkey));
::RSA *pRSADupKey = ::RSAPrivateKey_dup(pRSA);
::RSA_free(pRSA);
::EVP_PKEY_set1_RSA(pDupKey, pRSADupKey);
::RSA_free(pRSADupKey);
return pDupKey;
}
else
return nullptr;
}
#else
static ::EVP_PKEY *dup(const ::EVP_PKEY *pkey)
{
if (pkey)
return EVP_PKEY_dup(const_cast<EVP_PKEY *>(pkey));
else
return nullptr;
}
#endif
::EVP_PKEY *pkey_;
std::string priv_key_pwd;
};
} // namespace openvpn::OpenSSLPKI
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