91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2012 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER );
|
|
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <time.h>
|
|
#include <syslog.h>
|
|
#include <ipxe/uaccess.h>
|
|
#include <ipxe/image.h>
|
|
#include <ipxe/cms.h>
|
|
#include <usr/imgtrust.h>
|
|
|
|
/** @file
|
|
*
|
|
* Image trust management
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* Verify image using downloaded signature
|
|
*
|
|
* @v image Image to verify
|
|
* @v signature Image containing signature
|
|
* @v name Required common name, or NULL to allow any name
|
|
* @ret rc Return status code
|
|
*/
|
|
int imgverify ( struct image *image, struct image *signature,
|
|
const char *name ) {
|
|
size_t len;
|
|
void *data;
|
|
struct cms_signature sig;
|
|
time_t now;
|
|
int rc;
|
|
|
|
/* Mark image as untrusted */
|
|
image_untrust ( image );
|
|
|
|
/* Copy signature to internal memory */
|
|
len = signature->len;
|
|
data = malloc ( len );
|
|
if ( ! data ) {
|
|
rc = -ENOMEM;
|
|
goto err_alloc;
|
|
}
|
|
copy_from_user ( data, signature->data, 0, len );
|
|
|
|
/* Parse signature */
|
|
if ( ( rc = cms_parse ( &sig, data, len ) ) != 0 )
|
|
goto err_parse;
|
|
|
|
/* Use signature to verify image */
|
|
now = time ( NULL );
|
|
if ( ( rc = cms_verify ( &sig, image->data, image->len,
|
|
name, now, NULL ) ) != 0 )
|
|
goto err_verify;
|
|
|
|
/* Mark image as trusted */
|
|
image_trust ( image );
|
|
syslog ( LOG_NOTICE, "Image \"%s\" signature OK\n", image->name );
|
|
|
|
/* Free internal copy of signature */
|
|
free ( data );
|
|
|
|
return 0;
|
|
|
|
err_verify:
|
|
err_parse:
|
|
free ( data );
|
|
err_alloc:
|
|
syslog ( LOG_ERR, "Image \"%s\" signature bad: %s\n",
|
|
image->name, strerror ( rc ) );
|
|
return rc;
|
|
}
|