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//**********************************************************************;
// Copyright (c) 2017, SUSE Linux GmbH
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of Intel Corporation nor the names of its contributors
// may be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//**********************************************************************;
#include <string.h>
#include <errno.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include "files.h"
#include "log.h"
#include "tpm2_alg_util.h"
#include "tpm2_convert.h"
#include "tpm2_util.h"
static bool tpm2_convert_pubkey_ssl(TPMT_PUBLIC *public, tpm2_convert_pubkey_fmt format, const char *path);
tpm2_convert_pubkey_fmt tpm2_convert_pubkey_fmt_from_optarg(const char *label) {
if (strcasecmp(label, "der") == 0) {
return pubkey_format_der;
}
else if (strcasecmp(label, "pem") == 0) {
return pubkey_format_pem;
}
else if (strcasecmp(label, "tss") == 0) {
return pubkey_format_tss;
}
LOG_ERR("Invalid public key output format '%s' specified", label);
return pubkey_format_err;
}
tpm2_convert_sig_fmt tpm2_convert_sig_fmt_from_optarg(const char *label) {
if (strcasecmp(label, "tss") == 0) {
return signature_format_tss;
}
else if (strcasecmp(label, "plain") == 0) {
return signature_format_plain;
}
LOG_ERR("Invalid signature output format '%s' specified", label);
return signature_format_err;
}
static void print_ssl_error(const char *failed_action) {
char errstr[256] = {0};
unsigned long errnum = ERR_get_error();
ERR_error_string_n(errnum, errstr, sizeof(errstr));
LOG_ERR("%s: %s", failed_action, errstr);
}
bool tpm2_convert_pubkey_save(TPM2B_PUBLIC *public, tpm2_convert_pubkey_fmt format, const char *path) {
if (format == pubkey_format_der || format == pubkey_format_pem) {
return tpm2_convert_pubkey_ssl(&public->publicArea, format, path);
}
else if (format == pubkey_format_tss) {
return files_save_public(public, path);
}
LOG_ERR("Unsupported public key output format.");
return false;
}
static bool tpm2_convert_pubkey_ssl(TPMT_PUBLIC *public, tpm2_convert_pubkey_fmt format, const char *path) {
bool ret = false;
FILE *fp = NULL;
RSA *ssl_rsa_key = NULL;
BIGNUM *e = NULL, *n = NULL;
// need this before the first SSL call for getting human readable error
// strings in print_ssl_error()
ERR_load_crypto_strings();
if (public->type != TPM2_ALG_RSA) {
LOG_ERR("Unsupported key type for requested output format. Only RSA is supported.");
goto error;
}
UINT32 exponent = (public->parameters).rsaDetail.exponent;
if (exponent == 0) {
exponent = 0x10001;
}
// OpenSSL expects this in network byte order
exponent = tpm2_util_hton_32(exponent);
ssl_rsa_key = RSA_new();
if (!ssl_rsa_key) {
print_ssl_error("Failed to allocate OpenSSL RSA structure");
goto error;
}
e = BN_bin2bn((void*)&exponent, sizeof(exponent), NULL);
n = BN_bin2bn(public->unique.rsa.buffer, public->unique.rsa.size,
NULL);
if (!n || !e) {
print_ssl_error("Failed to convert data to SSL internal format");
goto error;
}
#if OPENSSL_VERSION_NUMBER < 0x1010000fL || defined(LIBRESSL_VERSION_NUMBER) /* OpenSSL 1.1.0 */
ssl_rsa_key->e = e;
ssl_rsa_key->n = n;
#else
if (!RSA_set0_key(ssl_rsa_key, n, e, NULL)) {
print_ssl_error("Failed to set RSA modulus and exponent components");
goto error;
}
#endif
/* modulus and exponent components are now owned by the RSA struct */
n = e = NULL;
fp = fopen(path, "wb");
if (!fp) {
LOG_ERR("Failed to open public key output file '%s': %s",
path, strerror(errno));
goto error;
}
int ssl_res = 0;
switch(format) {
case pubkey_format_pem:
ssl_res = PEM_write_RSA_PUBKEY(fp, ssl_rsa_key);
break;
case pubkey_format_der:
ssl_res = i2d_RSA_PUBKEY_fp(fp, ssl_rsa_key);
break;
default:
LOG_ERR("Invalid OpenSSL target format %d encountered", format);
goto error;
}
if (ssl_res <= 0) {
print_ssl_error("OpenSSL public key conversion failed");
goto error;
}
ret = true;
error:
if (fp) {
fclose(fp);
}
if (n) {
BN_free(n);
}
if (e) {
BN_free(e);
}
if (ssl_rsa_key) {
RSA_free(ssl_rsa_key);
}
ERR_free_strings();
return ret;
}
bool tpm2_convert_sig(TPMT_SIGNATURE *signature, tpm2_convert_sig_fmt format, const char *path) {
switch(format) {
case signature_format_tss:
return files_save_signature(signature, path);
case signature_format_plain: {
UINT8 *buffer;
UINT16 size;
buffer = tpm2_extract_plain_signature(&size, signature);
if (buffer == NULL) {
return false;
}
bool ret = files_save_bytes_to_file(path, buffer, size);
free(buffer);
return ret;
}
default:
LOG_ERR("Unsupported signature output format.");
return false;
}
}
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