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/*
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
*
* 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 3
* of the License, or (at your option) any later version.
*
* 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.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <getopt.h>
#include <openssl/pem.h>
#include <openssl/pkcs7.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <ccan/talloc/talloc.h>
#include "idc.h"
#include "image.h"
static const char *toolname = "sbsign";
struct sign_context {
struct image *image;
const char *infilename;
const char *outfilename;
int verbose;
int detached;
};
static struct option options[] = {
{ "output", required_argument, NULL, 'o' },
{ "cert", required_argument, NULL, 'c' },
{ "key", required_argument, NULL, 'k' },
{ "detached", no_argument, NULL, 'd' },
{ "verbose", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 },
};
static void usage(void)
{
printf("Usage: %s [options] --key <keyfile> --cert <certfile> "
"<efi-boot-image>\n"
"Sign an EFI boot image for use with secure boot.\n\n"
"Options:\n"
"\t--key <keyfile> signing key (PEM-encoded RSA "
"private key)\n"
"\t--cert <certfile> certificate (x509 certificate)\n"
"\t--detached write a detached signature, instead of\n"
"\t a signed binary\n"
"\t--output <file> write signed data to <file>\n"
"\t (default <efi-boot-image>.signed,\n"
"\t or <efi-boot-image>.pk7 for detached\n"
"\t signatures)\n",
toolname);
}
static void version(void)
{
printf("%s %s\n", toolname, VERSION);
}
static void set_default_outfilename(struct sign_context *ctx)
{
const char *extension;
extension = ctx->detached ? "pk7" : "signed";
ctx->outfilename = talloc_asprintf(ctx, "%s.%s",
ctx->infilename, extension);
}
int main(int argc, char **argv)
{
const char *keyfilename, *certfilename;
struct sign_context *ctx;
uint8_t *buf;
int rc, c;
ctx = talloc_zero(NULL, struct sign_context);
keyfilename = NULL;
certfilename = NULL;
for (;;) {
int idx;
c = getopt_long(argc, argv, "o:c:k:v", options, &idx);
if (c == -1)
break;
switch (c) {
case 'o':
ctx->outfilename = talloc_strdup(ctx, optarg);
break;
case 'c':
certfilename = optarg;
break;
case 'k':
keyfilename = optarg;
break;
case 'd':
ctx->detached = 1;
break;
case 'v':
ctx->verbose = 1;
break;
case 'V':
version();
return EXIT_SUCCESS;
case 'h':
usage();
return EXIT_SUCCESS;
}
}
if (argc != optind + 1) {
usage();
return EXIT_FAILURE;
}
ctx->infilename = argv[optind];
if (!ctx->outfilename)
set_default_outfilename(ctx);
if (!certfilename) {
fprintf(stderr,
"error: No certificate specified (with --cert)\n");
usage();
return EXIT_FAILURE;
}
if (!keyfilename) {
fprintf(stderr,
"error: No key specified (with --key)\n");
usage();
return EXIT_FAILURE;
}
ctx->image = image_load(ctx->infilename);
if (!ctx->image)
return EXIT_FAILURE;
talloc_steal(ctx, ctx->image);
image_pecoff_parse(ctx->image);
image_find_regions(ctx->image);
ERR_load_crypto_strings();
OpenSSL_add_all_digests();
BIO *privkey_bio = BIO_new_file(keyfilename, "r");
EVP_PKEY *pkey = PEM_read_bio_PrivateKey(privkey_bio, NULL, NULL, NULL);
if (!pkey) {
fprintf(stderr, "error reading private key %s\n", keyfilename);
return EXIT_FAILURE;
}
BIO *cert_bio = BIO_new_file(certfilename, "r");
X509 *cert = PEM_read_bio_X509(cert_bio, NULL, NULL, NULL);
if (!cert) {
fprintf(stderr, "error reading certificate %s\n", certfilename);
return EXIT_FAILURE;
}
const EVP_MD *md = EVP_get_digestbyname("SHA256");
/* set up the PKCS7 object */
PKCS7 *p7 = PKCS7_new();
PKCS7_set_type(p7, NID_pkcs7_signed);
PKCS7_SIGNER_INFO *si = PKCS7_sign_add_signer(p7, cert,
pkey, md, PKCS7_BINARY);
PKCS7_content_new(p7, NID_pkcs7_data);
rc = IDC_set(p7, si, ctx->image);
if (rc)
return EXIT_FAILURE;
ctx->image->sigsize = i2d_PKCS7(p7, NULL);
ctx->image->sigbuf = buf = talloc_array(ctx->image,
uint8_t, ctx->image->sigsize);
i2d_PKCS7(p7, &buf);
ERR_print_errors_fp(stdout);
if (ctx->detached)
image_write_detached(ctx->image, ctx->outfilename);
else
image_write_signed(ctx->image, ctx->outfilename);
talloc_free(ctx);
return EXIT_SUCCESS;
}
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