mirror of
https://github.com/libguestfs/libguestfs.git
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0920b805fd
This way it is easier to use them outside the rest of the code in guestfish for inspection & mount. Just code motion, no behaviour changes.
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/* libguestfs - shared disk decryption
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* Copyright (C) 2010 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 02110-1301 USA.
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*/
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/**
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* This file implements the decryption of disk images, usually done
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* before mounting their partitions.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "c-ctype.h"
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#include "guestfs.h"
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#include "options.h"
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/**
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* Make a LUKS map name from the partition name,
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* eg. C<"/dev/vda2" =E<gt> "luksvda2">
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*/
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static void
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make_mapname (const char *device, char *mapname, size_t len)
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{
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size_t i = 0;
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if (len < 5)
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abort ();
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strcpy (mapname, "luks");
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mapname += 4;
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len -= 4;
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if (STRPREFIX (device, "/dev/"))
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i = 5;
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for (; device[i] != '\0' && len >= 1; ++i) {
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if (c_isalnum (device[i])) {
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*mapname++ = device[i];
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len--;
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}
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}
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*mapname = '\0';
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}
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/**
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* Simple implementation of decryption: look for any C<crypto_LUKS>
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* partitions and decrypt them, then rescan for VGs. This only works
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* for Fedora whole-disk encryption. WIP to make this work for other
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* encryption schemes.
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*/
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void
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inspect_do_decrypt (guestfs_h *g)
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{
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CLEANUP_FREE_STRING_LIST char **partitions = guestfs_list_partitions (g);
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if (partitions == NULL)
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exit (EXIT_FAILURE);
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int need_rescan = 0;
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size_t i;
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for (i = 0; partitions[i] != NULL; ++i) {
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CLEANUP_FREE char *type = guestfs_vfs_type (g, partitions[i]);
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if (type && STREQ (type, "crypto_LUKS")) {
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char mapname[32];
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make_mapname (partitions[i], mapname, sizeof mapname);
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CLEANUP_FREE char *key = read_key (partitions[i]);
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/* XXX Should we call guestfs_luks_open_ro if readonly flag
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* is set? This might break 'mount_ro'.
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*/
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if (guestfs_luks_open (g, partitions[i], key, mapname) == -1)
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exit (EXIT_FAILURE);
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need_rescan = 1;
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}
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}
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if (need_rescan) {
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if (guestfs_vgscan (g) == -1)
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exit (EXIT_FAILURE);
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if (guestfs_vg_activate_all (g, 1) == -1)
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exit (EXIT_FAILURE);
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}
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}
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