1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <libcryptsetup.h>
32 #include "ask-password-api.h"
34 static const char *opt_type = NULL; /* LUKS1 or PLAIN */
35 static char *opt_cipher = NULL;
36 static unsigned opt_key_size = 0;
37 static char *opt_hash = NULL;
38 static unsigned opt_tries = 0;
39 static bool opt_readonly = false;
40 static bool opt_verify = false;
41 static usec_t opt_timeout = 0;
43 /* Options Debian's crypttab knows we don't:
55 static int parse_one_option(const char *option) {
58 /* Handled outside of this tool */
59 if (streq(option, "noauto"))
62 if (startswith(option, "cipher=")) {
65 if (!(t = strdup(option+7)))
71 } else if (startswith(option, "size=")) {
73 if (safe_atou(option+5, &opt_key_size) < 0) {
74 log_error("size= parse failure, ignoring.");
78 } else if (startswith(option, "hash=")) {
81 if (!(t = strdup(option+5)))
87 } else if (startswith(option, "tries=")) {
89 if (safe_atou(option+6, &opt_tries) < 0) {
90 log_error("tries= parse failure, ignoring.");
94 } else if (streq(option, "readonly"))
96 else if (streq(option, "verify"))
98 else if (streq(option, "luks"))
99 opt_type = CRYPT_LUKS1;
100 else if (streq(option, "plain") ||
101 streq(option, "swap") ||
102 streq(option, "tmp"))
103 opt_type = CRYPT_PLAIN;
104 else if (startswith(option, "timeout=")) {
106 if (parse_usec(option+8, &opt_timeout) < 0) {
107 log_error("timeout= parse failure, ignoring.");
112 log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
117 static int parse_options(const char *options) {
124 FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
128 if (!(o = strndup(w, l)))
131 r = parse_one_option(o);
141 static void log_glue(int level, const char *msg, void *usrptr) {
142 log_debug("%s", msg);
145 static char *disk_description(const char *path) {
146 struct udev *udev = NULL;
147 struct udev_device *device = NULL;
149 char *description = NULL;
154 if (stat(path, &st) < 0)
157 if (!S_ISBLK(st.st_mode))
160 if (!(udev = udev_new()))
163 if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev)))
166 if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) ||
167 (model = udev_device_get_property_value(device, "ID_MODEL")))
168 description = strdup(model);
172 udev_device_unref(device);
180 int main(int argc, char *argv[]) {
181 int r = EXIT_FAILURE;
182 struct crypt_device *cd = NULL;
183 char **passwords = NULL, *truncated_cipher = NULL;
184 const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL;
185 char *description = NULL;
188 log_error("This program requires at least two arguments.");
192 log_set_target(LOG_TARGET_AUTO);
193 log_parse_environment();
196 if (streq(argv[1], "attach")) {
200 const char *key_file = NULL;
202 crypt_status_info status;
205 log_error("attach requires at least two arguments.");
211 !streq(argv[4], "-") &&
212 !streq(argv[4], "none")) {
214 if (!path_is_absolute(argv[4]))
215 log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
220 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
221 parse_options(argv[5]);
223 /* A delicious drop of snake oil */
224 mlockall(MCL_FUTURE);
226 description = disk_description(argv[3]);
227 name = description ? description : argv[2];
229 if ((k = crypt_init(&cd, argv[3]))) {
230 log_error("crypt_init() failed: %s", strerror(-k));
234 crypt_set_log_callback(cd, log_glue, NULL);
236 status = crypt_status(cd, argv[2]);
237 if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
238 log_info("Volume %s already active.", argv[2]);
244 flags |= CRYPT_ACTIVATE_READONLY;
246 until = now(CLOCK_MONOTONIC) + (opt_timeout > 0 ? opt_timeout : 60 * USEC_PER_SEC);
248 opt_tries = opt_tries > 0 ? opt_tries : 3;
249 opt_key_size = (opt_key_size > 0 ? opt_key_size : 256);
250 hash = opt_hash ? opt_hash : "ripemd160";
255 l = strcspn(opt_cipher, "-");
257 if (!(truncated_cipher = strndup(opt_cipher, l))) {
258 log_error("Out of memory");
262 cipher = truncated_cipher;
263 cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain";
266 cipher_mode = "cbc-essiv:sha256";
269 for (try = 0; try < opt_tries; try++) {
270 bool pass_volume_key = false;
272 strv_free(passwords);
279 if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) {
280 log_error("Out of memory");
284 k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords);
288 log_error("Failed to query password: %s", strerror(-k));
293 char **passwords2 = NULL;
295 assert(strv_length(passwords) == 1);
297 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) {
298 log_error("Out of memory");
302 k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2);
306 log_error("Failed to query verification password: %s", strerror(-k));
310 assert(strv_length(passwords2) == 1);
312 if (!streq(passwords[0], passwords2[0])) {
313 log_warning("Passwords did not match, retrying.");
314 strv_free(passwords2);
318 strv_free(passwords2);
321 STRV_FOREACH(p, passwords) {
324 if (strlen(*p)+1 >= opt_key_size)
327 /* Pad password if necessary */
328 if (!(c = new(char, opt_key_size))) {
329 log_error("Out of memory.");
333 strncpy(c, *p, opt_key_size);
339 if (!opt_type || streq(opt_type, CRYPT_LUKS1))
340 k = crypt_load(cd, CRYPT_LUKS1, NULL);
342 if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) {
343 struct crypt_params_plain params;
348 /* In contrast to what the name
349 * crypt_setup() might suggest this
350 * doesn't actually format anything,
351 * it just configures encryption
352 * parameters when used for plain
354 k = crypt_format(cd, CRYPT_PLAIN,
362 pass_volume_key = streq(hash, "plain");
366 log_error("Loading of cryptographic parameters failed: %s", strerror(-k));
370 log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
371 crypt_get_cipher(cd),
372 crypt_get_cipher_mode(cd),
373 crypt_get_volume_key_size(cd)*8,
377 k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, opt_key_size, flags);
381 STRV_FOREACH(p, passwords) {
384 k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags);
386 k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags);
397 log_error("Failed to activate: %s", strerror(-k));
401 log_warning("Invalid passphrase.");
404 if (try >= opt_tries) {
405 log_error("Too many attempts.");
410 } else if (streq(argv[1], "detach")) {
413 if ((k = crypt_init_by_name(&cd, argv[2]))) {
414 log_error("crypt_init() failed: %s", strerror(-k));
418 crypt_set_log_callback(cd, log_glue, NULL);
420 if ((k = crypt_deactivate(cd, argv[2])) < 0) {
421 log_error("Failed to deactivate: %s", strerror(-k));
426 log_error("Unknown verb %s.", argv[1]);
440 free(truncated_cipher);
442 strv_free(passwords);