113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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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 as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdlib.h>
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#include <errno.h>
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#include <time.h>
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#include <syslog.h>
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#include <ipxe/uaccess.h>
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#include <ipxe/image.h>
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#include <ipxe/cms.h>
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#include <ipxe/validator.h>
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#include <ipxe/monojob.h>
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#include <usr/imgtrust.h>
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/** @file
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*
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* Image trust management
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*
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*/
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/**
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* Verify image using downloaded signature
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*
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* @v image Image to verify
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* @v signature Image containing signature
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* @v name Required common name, or NULL to allow any name
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* @ret rc Return status code
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*/
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int imgverify ( struct image *image, struct image *signature,
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const char *name ) {
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struct asn1_cursor *data;
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struct cms_signature *sig;
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struct cms_signer_info *info;
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time_t now;
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int next;
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int rc;
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/* Mark image as untrusted */
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image_untrust ( image );
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/* Get raw signature data */
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next = image_asn1 ( signature, 0, &data );
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if ( next < 0 ) {
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rc = next;
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goto err_asn1;
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}
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/* Parse signature */
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if ( ( rc = cms_signature ( data->data, data->len, &sig ) ) != 0 )
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goto err_parse;
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/* Free raw signature data */
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free ( data );
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data = NULL;
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/* Complete all certificate chains */
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list_for_each_entry ( info, &sig->info, list ) {
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if ( ( rc = create_validator ( &monojob, info->chain ) ) != 0 )
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goto err_create_validator;
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if ( ( rc = monojob_wait ( NULL, 0 ) ) != 0 )
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goto err_validator_wait;
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}
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/* Use signature to verify image */
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now = time ( NULL );
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if ( ( rc = cms_verify ( sig, image->data, image->len,
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name, now, NULL, NULL ) ) != 0 )
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goto err_verify;
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/* Drop reference to signature */
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cms_put ( sig );
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sig = NULL;
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/* Mark image as trusted */
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image_trust ( image );
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syslog ( LOG_NOTICE, "Image \"%s\" signature OK\n", image->name );
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return 0;
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err_verify:
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err_validator_wait:
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err_create_validator:
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cms_put ( sig );
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err_parse:
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free ( data );
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err_asn1:
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syslog ( LOG_ERR, "Image \"%s\" signature bad: %s\n",
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image->name, strerror ( rc ) );
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return rc;
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}
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