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/* libguestfs - shared disk decryption
* Copyright (C) 2010 Red Hat Inc.
*
* 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
* (at your option) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* This file implements the decryption of disk images, usually done
* before mounting their partitions.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "c-ctype.h"
#include "guestfs.h"
#include "options.h"
/**
* Make a LUKS map name from the partition name,
* eg. C<"/dev/vda2" =E<gt> "luksvda2">
*/
static void
make_mapname (const char *device, char *mapname, size_t len)
{
size_t i = 0;
if (len < 5)
abort ();
strcpy (mapname, "luks");
mapname += 4;
len -= 4;
if (STRPREFIX (device, "/dev/"))
i = 5;
for (; device[i] != '\0' && len >= 1; ++i) {
if (c_isalnum (device[i])) {
*mapname++ = device[i];
len--;
}
}
*mapname = '\0';
}
/**
* Simple implementation of decryption: look for any C<crypto_LUKS>
* partitions and decrypt them, then rescan for VGs. This only works
* for Fedora whole-disk encryption. WIP to make this work for other
* encryption schemes.
*/
void
inspect_do_decrypt (guestfs_h *g, struct key_store *ks)
{
CLEANUP_FREE_STRING_LIST char **partitions = guestfs_list_partitions (g);
if (partitions == NULL)
exit (EXIT_FAILURE);
int need_rescan = 0;
size_t i;
for (i = 0; partitions[i] != NULL; ++i) {
CLEANUP_FREE char *type = guestfs_vfs_type (g, partitions[i]);
if (type && STREQ (type, "crypto_LUKS")) {
char mapname[32];
make_mapname (partitions[i], mapname, sizeof mapname);
CLEANUP_FREE char *key = get_key (ks, partitions[i]);
/* XXX Should we call guestfs_luks_open_ro if readonly flag
* is set? This might break 'mount_ro'.
*/
if (guestfs_luks_open (g, partitions[i], key, mapname) == -1)
exit (EXIT_FAILURE);
need_rescan = 1;
}
}
if (need_rescan) {
if (guestfs_lvm_scan (g, 1) == -1)
exit (EXIT_FAILURE);
}
}
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