freebsd-nq/lib/libsecureboot/efi/efi_init.c
Marcin Wojtas 13ea0450a9 Extend libsecureboot(old libve) to obtain trusted certificates from UEFI and implement revocation
UEFI related headers were copied from edk2.

A new build option "MK_LOADER_EFI_SECUREBOOT" was added to allow
loading of trusted anchors from UEFI.

Certificate revocation support is also introduced.
The forbidden certificates are loaded from dbx variable.
Verification fails in two cases:

There is a direct match between cert in dbx and the one in the chain.
The CA used to sign the chain is found in dbx.
One can also insert a hash of TBS section of a certificate into dbx.
In this case verifications fails only if a direct match with a
certificate in chain is found.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: sjg
Obtained from: Semihalf
Sponsored by: Stormshield
Differential Revision:	https://reviews.freebsd.org/D19093
2019-03-06 06:39:42 +00:00

75 lines
2.2 KiB
C

/*-
* Copyright (c) 2019 Stormshield.
* Copyright (c) 2019 Semihalf.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define NEED_BRSSL_H
#include "../libsecureboot-priv.h"
#include <brssl.h>
void
ve_efi_init(void)
{
br_x509_certificate *xcs;
hash_data *digests;
size_t num;
int result;
static int once = 0;
if (once > 0)
return;
once = 1;
result = efi_secure_boot_enabled();
if (result <= 0)
return;
xcs = efi_get_trusted_certs(&num);
if (num > 0 && xcs != NULL) {
num = ve_trust_anchors_add(xcs, num);
free_certificates(xcs, num);
}
xcs = efi_get_forbidden_certs(&num);
if (num > 0 && xcs != NULL) {
num = ve_forbidden_anchors_add(xcs, num);
free_certificates(xcs, num);
}
digests = efi_get_forbidden_digests(&num);
if (num > 0 && digests != NULL) {
ve_forbidden_digest_add(digests, num);
/*
* Don't free the buffors for digests,
* since they are shallow copied.
*/
xfree(digests);
}
return;
}