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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2021 OpenVPN Inc <sales@openvpn.net>
* Copyright (C) 2010-2021 Fox Crypto B.V. <openvpn@foxcrypto.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file PKCS #11 mbed TLS backend
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#if defined(ENABLE_PKCS11) && defined(ENABLE_CRYPTO_MBEDTLS)
#include "errlevel.h"
#include "pkcs11_backend.h"
#include "ssl_verify_backend.h"
#include <mbedtls/x509.h>
static bool
pkcs11_get_x509_cert(pkcs11h_certificate_t pkcs11_cert, mbedtls_x509_crt *cert)
{
unsigned char *cert_blob = NULL;
size_t cert_blob_size = 0;
bool ret = false;
if (pkcs11h_certificate_getCertificateBlob(pkcs11_cert, NULL,
&cert_blob_size) != CKR_OK)
{
msg(M_WARN, "PKCS#11: Cannot retrieve certificate object size");
goto cleanup;
}
check_malloc_return((cert_blob = calloc(1, cert_blob_size)));
if (pkcs11h_certificate_getCertificateBlob(pkcs11_cert, cert_blob,
&cert_blob_size) != CKR_OK)
{
msg(M_WARN, "PKCS#11: Cannot retrieve certificate object");
goto cleanup;
}
if (!mbed_ok(mbedtls_x509_crt_parse(cert, cert_blob, cert_blob_size)))
{
msg(M_WARN, "PKCS#11: Could not parse certificate");
goto cleanup;
}
ret = true;
cleanup:
free(cert_blob);
return ret;
}
static bool
pkcs11_sign(void *pkcs11_cert, const void *src, size_t src_len,
void *dst, size_t dst_len)
{
return CKR_OK == pkcs11h_certificate_signAny(pkcs11_cert, CKM_RSA_PKCS,
src, src_len, dst, &dst_len);
}
int
pkcs11_init_tls_session(pkcs11h_certificate_t certificate,
struct tls_root_ctx *const ssl_ctx)
{
ASSERT(NULL != ssl_ctx);
ssl_ctx->pkcs11_cert = certificate;
ALLOC_OBJ_CLEAR(ssl_ctx->crt_chain, mbedtls_x509_crt);
if (!pkcs11_get_x509_cert(certificate, ssl_ctx->crt_chain))
{
msg(M_WARN, "PKCS#11: Cannot initialize certificate");
return 1;
}
if (tls_ctx_use_external_signing_func(ssl_ctx, pkcs11_sign, certificate))
{
msg(M_WARN, "PKCS#11: Cannot register signing function");
return 1;
}
return 0;
}
char *
pkcs11_certificate_dn(pkcs11h_certificate_t cert, struct gc_arena *gc)
{
char *ret = NULL;
mbedtls_x509_crt mbed_crt = { 0 };
if (!pkcs11_get_x509_cert(cert, &mbed_crt))
{
msg(M_WARN, "PKCS#11: Cannot retrieve mbed TLS certificate object");
goto cleanup;
}
if (!(ret = x509_get_subject(&mbed_crt, gc)))
{
msg(M_WARN, "PKCS#11: mbed TLS cannot parse subject");
goto cleanup;
}
cleanup:
mbedtls_x509_crt_free(&mbed_crt);
return ret;
}
int
pkcs11_certificate_serial(pkcs11h_certificate_t cert, char *serial,
size_t serial_len)
{
int ret = 1;
mbedtls_x509_crt mbed_crt = { 0 };
if (!pkcs11_get_x509_cert(cert, &mbed_crt))
{
msg(M_WARN, "PKCS#11: Cannot retrieve mbed TLS certificate object");
goto cleanup;
}
if (mbedtls_x509_serial_gets(serial, serial_len, &mbed_crt.serial) < 0)
{
msg(M_WARN, "PKCS#11: mbed TLS cannot parse serial");
goto cleanup;
}
ret = 0;
cleanup:
mbedtls_x509_crt_free(&mbed_crt);
return ret;
}
#endif /* defined(ENABLE_PKCS11) && defined(ENABLE_CRYPTO_MBEDTLS) */
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