mirror of https://github.com/ipxe/ipxe.git
82 lines
2.0 KiB
C
82 lines
2.0 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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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 <ipxe/uaccess.h>
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#include <ipxe/image.h>
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#include <ipxe/cms.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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size_t len;
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void *data;
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struct cms_signature sig;
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time_t now;
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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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/* Copy signature to internal memory */
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len = signature->len;
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data = malloc ( len );
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if ( ! data ) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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copy_from_user ( data, signature->data, 0, len );
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/* Parse signature */
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if ( ( rc = cms_parse ( &sig, data, len ) ) != 0 )
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goto err_parse;
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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 ) ) != 0 )
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goto err_verify;
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/* Mark image as trusted */
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image_trust ( image );
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err_verify:
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err_parse:
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free ( data );
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err_alloc:
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return rc;
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}
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