1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* 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 <stdbool.h>
#include <string.h>
#include <libintl.h>
#include <error.h>
#include <assert.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> "cryptvda2">
*/
static void
make_mapname (const char *device, char *mapname, size_t len)
{
size_t i = 0;
if (len < 6)
abort ();
strcpy (mapname, "crypt");
mapname += 5;
len -= 5;
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 encrypted
* partitions and decrypt them, then rescan for VGs.
*/
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, r;
size_t i, j;
for (i = 0; partitions[i] != NULL; ++i) {
CLEANUP_FREE char *type = guestfs_vfs_type (g, partitions[i]);
if (type &&
(STREQ (type, "crypto_LUKS") || STREQ (type, "BitLocker"))) {
bool is_bitlocker = STREQ (type, "BitLocker");
char mapname[32];
make_mapname (partitions[i], mapname, sizeof mapname);
#ifdef GUESTFS_HAVE_LUKS_UUID
CLEANUP_FREE char *uuid = NULL;
/* This fails for Windows BitLocker disks because cryptsetup
* luksUUID cannot read a UUID (unclear if this is a limitation
* of the format or cryptsetup).
*/
if (!is_bitlocker)
uuid = guestfs_luks_uuid (g, partitions[i]);
#else
const char *uuid = NULL;
#endif
CLEANUP_FREE_STRING_LIST char **keys = get_keys (ks, partitions[i], uuid);
assert (guestfs_int_count_strings (keys) > 0);
/* Try each key in turn. */
for (j = 0; keys[j] != NULL; ++j) {
/* XXX Should we set GUESTFS_CRYPTSETUP_OPEN_READONLY if readonly
* is set? This might break 'mount_ro'.
*/
guestfs_push_error_handler (g, NULL, NULL);
#ifdef GUESTFS_HAVE_CRYPTSETUP_OPEN
r = guestfs_cryptsetup_open (g, partitions[i], keys[j], mapname, -1);
#else
r = guestfs_luks_open (g, partitions[i], keys[j], mapname);
#endif
guestfs_pop_error_handler (g);
if (r == 0)
goto opened;
}
error (EXIT_FAILURE, 0,
_("could not find key to open LUKS encrypted %s.\n\n"
"Try using --key on the command line.\n\n"
"Original error: %s (%d)"),
partitions[i], guestfs_last_error (g),
guestfs_last_errno (g));
opened:
need_rescan = 1;
}
}
if (need_rescan) {
if (guestfs_lvm_scan (g, 1) == -1)
exit (EXIT_FAILURE);
}
}
|
