89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "image.h"
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#include <openssl/err.h>
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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#include <openssl/pkcs7.h>
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int main(int argc, char **argv)
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{
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struct cert_table_header *header;
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struct image *image;
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uint8_t *idcbuf, tmp;
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const uint8_t *buf;
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int idclen, rc;
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BIO *idcbio;
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PKCS7 *p7;
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if (argc != 2) {
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fprintf(stderr, "usage: %s <boot-image>\n", argv[0]);
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return EXIT_FAILURE;
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}
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image = image_load(argv[1]);
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image_pecoff_parse(image);
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if (!image->data_dir_sigtable->addr
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|| !image->data_dir_sigtable->size) {
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fprintf(stderr, "No signature table present\n");
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return EXIT_FAILURE;
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}
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header = image->buf + image->data_dir_sigtable->addr;
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ERR_load_crypto_strings();
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OpenSSL_add_all_digests();
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buf = (void *)(header + 1);
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p7 = d2i_PKCS7(NULL, &buf, header->size);
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idcbuf = p7->d.sign->contents->d.other->value.asn1_string->data;
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/* we don't include the type and length data in the hash */
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tmp = idcbuf[1];
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if (!(tmp & 0x80)) {
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idclen = tmp & 0x7f;
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idcbuf += 2;
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} else if ((tmp & 0x82) == 0x82) {
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idclen = (idcbuf[2] << 8) +
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idcbuf[3];
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idcbuf += 4;
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}
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idcbio = BIO_new(BIO_s_mem());
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BIO_write(idcbio, idcbuf, idclen);
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rc = PKCS7_verify(p7, NULL, NULL, idcbio, NULL,
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PKCS7_BINARY | PKCS7_NOVERIFY);
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if (!rc) {
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printf("PKCS7 verification failed\n");
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ERR_print_errors_fp(stderr);
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} else {
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printf("Signature verification OK\n");
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}
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return rc ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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