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/*
* Copyright (C) 2017 Andreas Steffen
* HSR Hochschule für Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "tpm_cert.h"
#include <tpm_tss.h>
#include <utils/debug.h>
/**
* See header.
*/
certificate_t *tpm_cert_load(certificate_type_t type, va_list args)
{
tpm_tss_t *tpm;
chunk_t keyid = chunk_empty, pin = chunk_empty, data = chunk_empty;
certificate_t *cert;
char handle_str[4];
size_t len;
uint32_t hierarchy = 0x40000001; /* TPM_RH_OWNER */
uint32_t handle;
bool success;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_PKCS11_KEYID:
keyid = va_arg(args, chunk_t);
continue;
case BUILD_PKCS11_SLOT:
hierarchy = va_arg(args, int);
continue;
case BUILD_PKCS11_MODULE:
va_arg(args, char*);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
/* convert keyid into 32 bit TPM key object handle */
if (!keyid.len)
{
return NULL;
}
len = min(keyid.len, 4);
memset(handle_str, 0x00, 4);
memcpy(handle_str + 4 - len, keyid.ptr + keyid.len - len, len);
handle = untoh32(handle_str);
/* try to find a TPM 2.0 */
tpm = tpm_tss_probe(TPM_VERSION_2_0);
if (!tpm)
{
DBG1(DBG_LIB, "no TPM 2.0 found");
return NULL;
}
success = tpm->get_data(tpm, hierarchy, handle, pin, &data);
tpm->destroy(tpm);
if (!success)
{
DBG1(DBG_LIB, "loading certificate from TPM NV index 0x%08x failed",
handle);
return NULL;
}
cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_BLOB_ASN1_DER, data, BUILD_END);
free(data.ptr);
if (!cert)
{
DBG1(DBG_LIB, "parsing certificate from TPM NV index 0x%08x failed",
handle);
return NULL;
}
DBG1(DBG_LIB, "loaded certificate from TPM NV index 0x%08x", handle);
return cert;
}
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