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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 a mbed TLS x509_crt object
#ifndef OPENVPN_MBEDTLS_PKI_X509CERT_H
#define OPENVPN_MBEDTLS_PKI_X509CERT_H
#include <string>
#include <sstream>
#include <cstring>
#include <iostream>
#include <mbedtls/x509.h>
#include <mbedtls/pem.h>
#include <mbedtls/base64.h>
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/rc.hpp>
#include <openvpn/buffer/buffer.hpp>
#include <openvpn/mbedtls/util/error.hpp>
namespace openvpn::MbedTLSPKI {
class X509Cert : public RC<thread_unsafe_refcount>
{
public:
typedef RCPtr<X509Cert> Ptr;
X509Cert()
: chain(nullptr)
{
}
X509Cert(const std::string &cert_txt, const std::string &title, const bool strict)
: chain(nullptr)
{
try
{
parse(cert_txt, title, strict);
}
catch (...)
{
dealloc();
throw;
}
}
void parse(const std::string &cert_txt, const std::string &title, const bool strict)
{
alloc();
if (cert_txt.empty())
throw MbedTLSException(title + " certificate is undefined");
// cert_txt.length() is increased by 1 as it does not include the NULL-terminator
// which mbedtls_x509_crt_parse() expects to see.
const int status = mbedtls_x509_crt_parse(chain,
(const unsigned char *)cert_txt.c_str(),
cert_txt.length() + 1);
if (status < 0)
{
throw MbedTLSException("error parsing " + title + " certificate", status);
}
if (status > 0)
{
std::ostringstream os;
os << status << " certificate(s) in " << title << " bundle failed to parse";
if (strict)
throw MbedTLSException(os.str());
else
OPENVPN_LOG("MBEDTLS: " << os.str());
}
}
static std::string der_to_pem(const unsigned char *der, size_t der_size)
{
size_t olen = 0;
int ret;
ret = mbedtls_pem_write_buffer(begin_cert,
end_cert,
der,
der_size,
NULL,
0,
&olen);
if (ret != MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL)
throw MbedTLSException("X509Cert::extract: can't calculate PEM size");
BufferAllocated buff(olen, 0);
ret = mbedtls_pem_write_buffer(begin_cert,
end_cert,
der,
der_size,
buff.data(),
buff.max_size(),
&olen);
if (ret)
throw MbedTLSException("X509Cert::extract: can't write PEM buffer");
return std::string((const char *)buff.data());
}
std::string extract() const
{
return der_to_pem(chain->raw.p, chain->raw.len);
}
std::vector<std::string> extract_extra_certs() const
{
std::vector<std::string> extra_certs;
/* extra certificates are appended to the main one */
for (mbedtls_x509_crt *cert = chain->next; cert; cert = cert->next)
{
extra_certs.push_back(der_to_pem(cert->raw.p, cert->raw.len));
}
return extra_certs;
}
mbedtls_x509_crt *get() const
{
return chain;
}
virtual ~X509Cert()
{
dealloc();
}
protected:
void alloc()
{
if (!chain)
{
chain = new mbedtls_x509_crt;
mbedtls_x509_crt_init(chain);
}
}
mbedtls_x509_crt *chain;
private:
void dealloc()
{
if (chain)
{
mbedtls_x509_crt_free(chain);
delete chain;
chain = nullptr;
}
}
constexpr static const char *begin_cert = "-----BEGIN CERTIFICATE-----\n";
constexpr static const char *end_cert = "-----END CERTIFICATE-----\n";
};
} // namespace openvpn::MbedTLSPKI
#endif
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