geli_metadata.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2018 Ian Lepore <[email protected]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stand.h>
#include <bootstrap.h>
#include <sys/param.h>
#include <sys/linker.h>
#include "geliboot.h"

/*
 * Export a keybuf as metadata attached to a kernel module.  This is separate
 * from the lower-level key management functions to avoid creating a linker
 * dependency on the libsa metadata routines when the geli code is linked into
 * early-stage bootloaders such as gptboot.  Only loader(8) variants call this.
 */
void
geli_export_key_metadata(struct preloaded_file *kfp)
{
    struct keybuf *keybuf;

    keybuf = malloc(GELI_KEYBUF_SIZE);
    geli_export_key_buffer(keybuf);
    file_addmetadata(kfp, MODINFOMD_KEYBUF, GELI_KEYBUF_SIZE, keybuf);
    explicit_bzero(keybuf, GELI_KEYBUF_SIZE);
    free(keybuf);
}