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/* libguestfs - the guestfsd daemon
* 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.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
#define MAX_ARGS 64
int
optgroup_luks_available (void)
{
return prog_exists ("cryptsetup");
}
/* Callers must also call remove_temp (tempfile). */
static char *
write_key_to_temp (const char *key)
{
char *tempfile = strdup ("/tmp/luksXXXXXX");
if (!tempfile) {
reply_with_perror ("strdup");
return NULL;
}
int fd = mkstemp (tempfile);
if (fd == -1) {
reply_with_perror ("mkstemp");
goto error;
}
size_t len = strlen (key);
if (xwrite (fd, key, len) == -1) {
reply_with_perror ("write");
close (fd);
goto error;
}
if (close (fd) == -1) {
reply_with_perror ("close");
goto error;
}
return tempfile;
error:
unlink (tempfile);
free (tempfile);
return NULL;
}
static void
remove_temp (char *tempfile)
{
unlink (tempfile);
free (tempfile);
}
static int
luks_open (const char *device, const char *key, const char *mapname,
int readonly)
{
/* Sanity check: /dev/mapper/mapname must not exist already. Note
* that the device-mapper control device (/dev/mapper/control) is
* always there, so you can't ever have mapname == "control".
*/
size_t len = strlen (mapname);
char devmapper[len+32];
snprintf (devmapper, len+32, "/dev/mapper/%s", mapname);
if (access (devmapper, F_OK) == 0) {
reply_with_error ("%s: device already exists", devmapper);
return -1;
}
char *tempfile = write_key_to_temp (key);
if (!tempfile)
return -1;
const char *argv[MAX_ARGS];
size_t i = 0;
ADD_ARG (argv, i, "cryptsetup");
ADD_ARG (argv, i, "-d");
ADD_ARG (argv, i, tempfile);
if (readonly) ADD_ARG (argv, i, "--readonly");
ADD_ARG (argv, i, "luksOpen");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, mapname);
ADD_ARG (argv, i, NULL);
char *err;
int r = commandv (NULL, &err, (const char * const *) argv);
remove_temp (tempfile);
if (r == -1) {
reply_with_error ("%s", err);
free (err);
return -1;
}
free (err);
udev_settle ();
return 0;
}
int
do_luks_open (const char *device, const char *key, const char *mapname)
{
return luks_open (device, key, mapname, 0);
}
int
do_luks_open_ro (const char *device, const char *key, const char *mapname)
{
return luks_open (device, key, mapname, 1);
}
int
do_luks_close (const char *device)
{
/* Must be /dev/mapper/... */
if (! STRPREFIX (device, "/dev/mapper/")) {
reply_with_error ("luks_close: you must call this on the /dev/mapper device created by luks_open");
return -1;
}
const char *mapname = &device[12];
char *err;
int r = command (NULL, &err, "cryptsetup", "luksClose", mapname, NULL);
if (r == -1) {
reply_with_error ("%s", err);
free (err);
return -1;
}
free (err);
udev_settle ();
return 0;
}
static int
luks_format (const char *device, const char *key, int keyslot,
const char *cipher)
{
char *tempfile = write_key_to_temp (key);
if (!tempfile)
return -1;
const char *argv[MAX_ARGS];
char keyslot_s[16];
size_t i = 0;
ADD_ARG (argv, i, "cryptsetup");
ADD_ARG (argv, i, "-q");
if (cipher) {
ADD_ARG (argv, i, "--cipher");
ADD_ARG (argv, i, cipher);
}
ADD_ARG (argv, i, "--key-slot");
snprintf (keyslot_s, sizeof keyslot_s, "%d", keyslot);
ADD_ARG (argv, i, keyslot_s);
ADD_ARG (argv, i, "luksFormat");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, tempfile);
ADD_ARG (argv, i, NULL);
char *err;
int r = commandv (NULL, &err, (const char * const *) argv);
remove_temp (tempfile);
if (r == -1) {
reply_with_error ("%s", err);
free (err);
return -1;
}
free (err);
udev_settle ();
return 0;
}
int
do_luks_format (const char *device, const char *key, int keyslot)
{
return luks_format (device, key, keyslot, NULL);
}
int
do_luks_format_cipher (const char *device, const char *key, int keyslot,
const char *cipher)
{
return luks_format (device, key, keyslot, cipher);
}
int
do_luks_add_key (const char *device, const char *key, const char *newkey,
int keyslot)
{
char *keyfile = write_key_to_temp (key);
if (!keyfile)
return -1;
char *newkeyfile = write_key_to_temp (newkey);
if (!newkeyfile) {
remove_temp (keyfile);
return -1;
}
const char *argv[MAX_ARGS];
char keyslot_s[16];
size_t i = 0;
ADD_ARG (argv, i, "cryptsetup");
ADD_ARG (argv, i, "-q");
ADD_ARG (argv, i, "-d");
ADD_ARG (argv, i, keyfile);
ADD_ARG (argv, i, "--key-slot");
snprintf (keyslot_s, sizeof keyslot_s, "%d", keyslot);
ADD_ARG (argv, i, keyslot_s);
ADD_ARG (argv, i, "luksAddKey");
ADD_ARG (argv, i, device);
ADD_ARG (argv, i, newkeyfile);
ADD_ARG (argv, i, NULL);
char *err;
int r = commandv (NULL, &err, (const char * const *) argv);
remove_temp (keyfile);
remove_temp (newkeyfile);
if (r == -1) {
reply_with_error ("%s", err);
free (err);
return -1;
}
free (err);
return 0;
}
int
do_luks_kill_slot (const char *device, const char *key, int keyslot)
{
char *tempfile = write_key_to_temp (key);
if (!tempfile)
return -1;
const char *argv[MAX_ARGS];
char keyslot_s[16];
size_t i = 0;
ADD_ARG (argv, i, "cryptsetup");
ADD_ARG (argv, i, "-q");
ADD_ARG (argv, i, "-d");
ADD_ARG (argv, i, tempfile);
ADD_ARG (argv, i, "luksKillSlot");
ADD_ARG (argv, i, device);
snprintf (keyslot_s, sizeof keyslot_s, "%d", keyslot);
ADD_ARG (argv, i, keyslot_s);
ADD_ARG (argv, i, NULL);
char *err;
int r = commandv (NULL, &err, (const char * const *) argv);
remove_temp (tempfile);
if (r == -1) {
reply_with_error ("%s", err);
free (err);
return -1;
}
free (err);
return 0;
}
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