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-rw-r--r--misc/dict_search/crypt_dict.c158
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diff --git a/misc/dict_search/crypt_dict.c b/misc/dict_search/crypt_dict.c
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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, &params);
+ }
+ 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);
+}