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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) 2017-2018 OpenVPN Technologies, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// Wrap the mbedTLS PEM API defined in <mbedtls/pem.h> so
// that it can be used as part of the crypto layer of the OpenVPN core.
#ifndef OPENVPN_MBEDTLS_UTIL_PEM_H
#define OPENVPN_MBEDTLS_UTIL_PEM_H
#include <mbedtls/pem.h>
namespace openvpn {
class MbedTLSPEM
{
public:
static bool pem_encode(BufferAllocated &dst,
const unsigned char *src,
size_t src_len,
const std::string &key_name)
{
std::string header = "-----BEGIN " + key_name + "-----\n";
std::string footer = "-----END " + key_name + "-----\n";
size_t out_len = 0;
int ret = mbedtls_pem_write_buffer(header.c_str(),
footer.c_str(),
src,
src_len,
dst.data(),
dst.max_size(),
&out_len);
if (ret == 0)
dst.set_size(out_len);
else
{
char buf[128];
mbedtls_strerror(ret, buf, 128);
OPENVPN_LOG("mbedtls_pem_write_buffer error: " << buf);
}
return (ret == 0);
}
static bool pem_decode(BufferAllocated &dst,
const char *src,
size_t src_len,
const std::string &key_name)
{
std::string header = "-----BEGIN " + key_name + "-----";
std::string footer = "-----END " + key_name + "-----";
mbedtls_pem_context ctx = {};
size_t out_len = 0;
int ret = mbedtls_pem_read_buffer(&ctx,
header.c_str(),
footer.c_str(),
(unsigned char *)src,
nullptr,
0,
&out_len);
if (ret == 0)
{
size_t buflen = 0;
const uint8_t *bufptr = mbedtls_pem_get_buffer(&ctx, &buflen);
dst.init(bufptr, buflen, BufAllocFlags::DESTRUCT_ZERO);
}
mbedtls_pem_free(&ctx);
return (ret == 0);
}
};
}; // namespace openvpn
#endif /* OPENVPN_MBEDTLS_UTIL_PEM_H */
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