128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
|
|
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
|
|
*
|
|
* 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 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.
|
|
*
|
|
* You can also choose to distribute this program under the terms of
|
|
* the Unmodified Binary Distribution Licence (as given in the file
|
|
* COPYING.UBDL), provided that you have satisfied its requirements.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
|
|
|
|
#include <stdlib.h>
|
|
#include <ipxe/crypto.h>
|
|
#include <ipxe/sha256.h>
|
|
#include <ipxe/x509.h>
|
|
#include <ipxe/settings.h>
|
|
#include <ipxe/dhcp.h>
|
|
#include <ipxe/init.h>
|
|
#include <ipxe/rootcert.h>
|
|
|
|
/** @file
|
|
*
|
|
* Root certificate store
|
|
*
|
|
*/
|
|
|
|
/** Length of a root certificate fingerprint */
|
|
#define FINGERPRINT_LEN SHA256_DIGEST_SIZE
|
|
|
|
/* Allow trusted certificates to be overridden if not explicitly specified */
|
|
#ifdef TRUSTED
|
|
#define ALLOW_TRUST_OVERRIDE 0
|
|
#else
|
|
#define ALLOW_TRUST_OVERRIDE 1
|
|
#endif
|
|
|
|
/* Use iPXE root CA if no trusted certificates are explicitly specified */
|
|
#ifndef TRUSTED
|
|
#define TRUSTED \
|
|
/* iPXE root CA */ \
|
|
0x9f, 0xaf, 0x71, 0x7b, 0x7f, 0x8c, 0xa2, 0xf9, 0x3c, 0x25, \
|
|
0x6c, 0x79, 0xf8, 0xac, 0x55, 0x91, 0x89, 0x5d, 0x66, 0xd1, \
|
|
0xff, 0x3b, 0xee, 0x63, 0x97, 0xa7, 0x0d, 0x29, 0xc6, 0x5e, \
|
|
0xed, 0x1a,
|
|
#endif
|
|
|
|
/** Root certificate fingerprints */
|
|
static const uint8_t fingerprints[] = { TRUSTED };
|
|
|
|
/** Root certificate fingerprint setting */
|
|
static struct setting trust_setting __setting ( SETTING_CRYPTO, trust ) = {
|
|
.name = "trust",
|
|
.description = "Trusted root certificate fingerprints",
|
|
.tag = DHCP_EB_TRUST,
|
|
.type = &setting_type_hex,
|
|
};
|
|
|
|
/** Root certificates */
|
|
struct x509_root root_certificates = {
|
|
.digest = &sha256_algorithm,
|
|
.count = ( sizeof ( fingerprints ) / FINGERPRINT_LEN ),
|
|
.fingerprints = fingerprints,
|
|
};
|
|
|
|
/**
|
|
* Initialise root certificate
|
|
*
|
|
* The list of trusted root certificates can be specified at build
|
|
* time using the TRUST= build parameter. If no certificates are
|
|
* specified, then the default iPXE root CA certificate is trusted.
|
|
*
|
|
* If no certificates were explicitly specified, then we allow the
|
|
* list of trusted root certificate fingerprints to be overridden
|
|
* using the "trust" setting, but only at the point of iPXE
|
|
* initialisation. This prevents untrusted sources of settings
|
|
* (e.g. DHCP) from subverting the chain of trust, while allowing
|
|
* trustworthy sources (e.g. VMware GuestInfo or non-volatile stored
|
|
* options) to specify the trusted root certificate without requiring
|
|
* a rebuild.
|
|
*/
|
|
static void rootcert_init ( void ) {
|
|
static int initialised;
|
|
void *external = NULL;
|
|
int len;
|
|
|
|
/* Allow trusted root certificates to be overridden only if
|
|
* not explicitly specified at build time.
|
|
*/
|
|
if ( ALLOW_TRUST_OVERRIDE && ( ! initialised ) ) {
|
|
|
|
/* Fetch copy of "trust" setting, if it exists. This
|
|
* memory will never be freed.
|
|
*/
|
|
if ( ( len = fetch_raw_setting_copy ( NULL, &trust_setting,
|
|
&external ) ) >= 0 ) {
|
|
root_certificates.fingerprints = external;
|
|
root_certificates.count = ( len / FINGERPRINT_LEN );
|
|
}
|
|
|
|
/* Prevent subsequent modifications */
|
|
initialised = 1;
|
|
}
|
|
|
|
DBGC ( &root_certificates, "ROOTCERT using %d %s certificate(s):\n",
|
|
root_certificates.count, ( external ? "external" : "built-in" ));
|
|
DBGC_HDA ( &root_certificates, 0, root_certificates.fingerprints,
|
|
( root_certificates.count * FINGERPRINT_LEN ) );
|
|
}
|
|
|
|
/** Root certificate initialiser */
|
|
struct startup_fn rootcert_startup_fn __startup_fn ( STARTUP_LATE ) = {
|
|
.startup = rootcert_init,
|
|
};
|