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/*
* Example of LUKS/TrueCrypt password dictionary search
*
* Copyright (C) 2012 Milan Broz <gmazyland@gmail.com>
*
* Run this (for LUKS as root),
* e.g. ./crypt_dict test.img /usr/share/john/password.lst 4
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/prctl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <libcryptsetup.h>
#define MAX_LEN 512
static enum { LUKS, TCRYPT } device_type;
static void check(struct crypt_device *cd, const char *pwd_file, unsigned my_id, unsigned max_id)
{
FILE *f;
int len, r = -1;
unsigned long line = 0;
char pwd[MAX_LEN];
if (fork())
return;
/* open password file, now in separate process */
f = fopen(pwd_file, "r");
if (!f) {
printf("Cannot open %s.\n", pwd_file);
exit(EXIT_FAILURE);
}
while (fgets(pwd, MAX_LEN, f)) {
/* every process tries N-th line, skip others */
if (line++ % max_id != my_id)
continue;
len = strlen(pwd);
/* strip EOL - this is like a input from tty */
if (len && pwd[len - 1] == '\n') {
pwd[len - 1] = '\0';
len--;
}
/* lines starting "#!comment" are comments */
if (len >= 9 && !strncmp(pwd, "#!comment", 9)) {
/* printf("skipping %s\n", pwd); */
continue;
}
/* printf("%d: checking %s\n", my_id, pwd); */
if (device_type == LUKS)
r = crypt_activate_by_passphrase(cd, NULL, CRYPT_ANY_SLOT, pwd, len, 0);
else if (device_type == TCRYPT) {
struct crypt_params_tcrypt params = {
.flags = CRYPT_TCRYPT_LEGACY_MODES,
.passphrase = pwd,
.passphrase_size = len,
};
r = crypt_load(cd, CRYPT_TCRYPT, ¶ms);
}
if (r >= 0) {
printf("Found passphrase for slot %d: \"%s\"\n", r, pwd);
break;
}
}
fclose(f);
crypt_free(cd);
exit(r >= 0 ? 2 : EXIT_SUCCESS);
}
int main(int argc, char *argv[])
{
int i, status, procs = 4;
struct crypt_device *cd;
if (argc < 4 || argc > 5) {
printf("Use: %s luks|tcrypt <device|file> <password file> [#processes] %d\n", argv[0], argc);
exit(EXIT_FAILURE);
}
if (argc == 5 && (sscanf(argv[4], "%i", &procs) != 1 || procs < 1)) {
printf("Wrong number of processes.\n");
exit(EXIT_FAILURE);
}
if (!strcmp(argv[1], "luks"))
device_type = LUKS;
else if (!strcmp(argv[1], "tcrypt"))
device_type = TCRYPT;
else {
printf("Wrong device type %s.\n", argv[1]);
exit(EXIT_FAILURE);
}
/* crypt_set_debug_level(CRYPT_DEBUG_ALL); */
/*
* Need to create temporary keyslot device-mapper devices and allocate loop if needed,
* so root is required here.
*/
if (getuid() != 0) {
printf("You must be root to run this program.\n");
exit(EXIT_FAILURE);
}
/* signal all children if anything happens */
prctl(PR_SET_PDEATHSIG, SIGHUP);
setpriority(PRIO_PROCESS, 0, -5);
/* we are not going to modify anything, so common init is ok */
if (crypt_init(&cd, argv[2]) ||
(device_type == LUKS && crypt_load(cd, CRYPT_LUKS1, NULL))) {
printf("Cannot open %s.\n", argv[2]);
exit(EXIT_FAILURE);
}
/* run scan in separate processes, it is up to scheduler to assign CPUs inteligently */
for (i = 0; i < procs; i++)
check(cd, argv[3], i, procs);
/* wait until at least one finishes with error or status 2 (key found) */
while (wait(&status) != -1 && WIFEXITED(status)) {
if (WEXITSTATUS(status) == EXIT_SUCCESS)
continue;
/* kill rest of processes */
kill(0, SIGHUP);
/* not reached */
break;
}
exit(0);
}
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