mirror of
https://github.com/ipxe/ipxe
synced 2026-05-09 18:00:12 +03:00
Michael Brown
72316b820d
Add the "imgdecrypt" command that can be used to decrypt a detached
encrypted data image using a cipher key obtained from a separate CMS
envelope image. For example:
# Create non-detached encrypted CMS messages
#
openssl cms -encrypt -binary -aes-256-gcm -recip client.crt \
-in vmlinuz -outform DER -out vmlinuz.cms
openssl cms -encrypt -binary -aes-256-gcm -recip client.crt \
-in initrd.img -outform DER -out initrd.img.cms
# Detach data from envelopes (using iPXE's contrib/crypto/cmsdetach)
#
cmsdetach vmlinuz.cms -d vmlinuz.dat -e vmlinuz.env
cmsdetach initrd.img.cms -d initrd.img.dat -e initrd.img.env
and then within iPXE:
#!ipxe
imgfetch http://192.168.0.1/vmlinuz.dat
imgfetch http://192.168.0.1/initrd.img.dat
imgdecrypt vmlinuz.dat http://192.168.0.1/vmlinuz.env
imgdecrypt initrd.img.dat http://192.168.0.1/initrd.img.env
boot vmlinuz
Signed-off-by: Michael Brown <mcb30@ipxe.org>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/*
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* Copyright (C) 2024 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 <string.h>
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#include <syslog.h>
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#include <ipxe/image.h>
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#include <ipxe/cms.h>
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#include <ipxe/privkey.h>
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#include <usr/imgcrypt.h>
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/** @file
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*
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* Image encryption management
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*
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*/
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/**
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* Decrypt image using downloaded envelope
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*
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* @v image Image to decrypt
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* @v envelope Image containing decryption key
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* @v name Decrypted image name (or NULL to use default)
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* @ret rc Return status code
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*/
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int imgdecrypt ( struct image *image, struct image *envelope,
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const char *name ) {
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struct cms_message *cms;
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int rc;
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/* Parse envelope */
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if ( ( rc = cms_message ( envelope, &cms ) ) != 0 )
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goto err_parse;
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/* Decrypt image */
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if ( ( rc = cms_decrypt ( cms, image, name, &private_key ) ) != 0 )
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goto err_decrypt;
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/* Drop reference to message */
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cms_put ( cms );
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cms = NULL;
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/* Record decryption */
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syslog ( LOG_NOTICE, "Image \"%s\" decrypted OK\n", image->name );
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return 0;
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err_decrypt:
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cms_put ( cms );
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err_parse:
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syslog ( LOG_ERR, "Image \"%s\" decryption failed: %s\n",
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image->name, strerror ( rc ) );
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return rc;
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}
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