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/>.
27 #include <libcryptsetup.h>
33 #include "ask-password-api.h"
35 static const char *opt_type = NULL; /* LUKS1 or PLAIN */
36 static char *opt_cipher = NULL;
37 static unsigned opt_key_size = 0;
38 static char *opt_hash = NULL;
39 static unsigned opt_tries = 0;
40 static bool opt_readonly = false;
41 static bool opt_verify = false;
42 static usec_t opt_timeout = 0;
44 /* Options Debian's crypttab knows we don't:
56 static int parse_one_option(const char *option) {
59 /* Handled outside of this tool */
60 if (streq(option, "noauto"))
63 if (startswith(option, "cipher=")) {
66 if (!(t = strdup(option+7)))
72 } else if (startswith(option, "size=")) {
74 if (safe_atou(option+5, &opt_key_size) < 0) {
75 log_error("size= parse failure, ignoring.");
79 } else if (startswith(option, "hash=")) {
82 if (!(t = strdup(option+5)))
88 } else if (startswith(option, "tries=")) {
90 if (safe_atou(option+6, &opt_tries) < 0) {
91 log_error("tries= parse failure, ignoring.");
95 } else if (streq(option, "readonly"))
97 else if (streq(option, "verify"))
99 else if (streq(option, "luks"))
100 opt_type = CRYPT_LUKS1;
101 else if (streq(option, "plain") ||
102 streq(option, "swap") ||
103 streq(option, "tmp"))
104 opt_type = CRYPT_PLAIN;
105 else if (startswith(option, "timeout=")) {
107 if (parse_usec(option+8, &opt_timeout) < 0) {
108 log_error("timeout= parse failure, ignoring.");
113 log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
118 static int parse_options(const char *options) {
125 FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
129 if (!(o = strndup(w, l)))
132 r = parse_one_option(o);
142 static void log_glue(int level, const char *msg, void *usrptr) {
143 log_debug("%s", msg);
146 static char *disk_description(const char *path) {
147 struct udev *udev = NULL;
148 struct udev_device *device = NULL;
150 char *description = NULL;
155 if (stat(path, &st) < 0)
158 if (!S_ISBLK(st.st_mode))
161 if (!(udev = udev_new()))
164 if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev)))
167 if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) ||
168 (model = udev_device_get_property_value(device, "ID_MODEL")) ||
169 (model = udev_device_get_property_value(device, "DM_NAME")))
170 description = strdup(model);
174 udev_device_unref(device);
182 static char *disk_mount_point(const char *label) {
183 char *mp = NULL, *device = NULL;
187 /* Yeah, we don't support native systemd unit files here for now */
189 if (asprintf(&device, "/dev/mapper/%s", label) < 0)
192 if (!(f = setmntent("/etc/fstab", "r")))
195 while ((m = getmntent(f)))
196 if (path_equal(m->mnt_fsname, device)) {
197 mp = strdup(m->mnt_dir);
210 static int help(void) {
212 printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
213 "%s detach VOLUME\n\n"
214 "Attaches or detaches an encrypted block device.\n",
215 program_invocation_short_name,
216 program_invocation_short_name);
221 int main(int argc, char *argv[]) {
222 int r = EXIT_FAILURE;
223 struct crypt_device *cd = NULL;
224 char **passwords = NULL, *truncated_cipher = NULL;
225 const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL;
226 char *description = NULL, *name_buffer = NULL, *mount_point = NULL;
234 log_error("This program requires at least two arguments.");
238 log_set_target(LOG_TARGET_AUTO);
239 log_parse_environment();
242 if (streq(argv[1], "attach")) {
246 const char *key_file = NULL;
248 crypt_status_info status;
250 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
253 log_error("attach requires at least two arguments.");
259 !streq(argv[4], "-") &&
260 !streq(argv[4], "none")) {
262 if (!path_is_absolute(argv[4]))
263 log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
268 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
269 parse_options(argv[5]);
271 /* A delicious drop of snake oil */
272 mlockall(MCL_FUTURE);
274 description = disk_description(argv[3]);
275 mount_point = disk_mount_point(argv[2]);
277 if (description && streq(argv[2], description)) {
278 /* If the description string is simply the
279 * volume name, then let's not show this
285 if (mount_point && description)
286 asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point);
287 else if (mount_point)
288 asprintf(&name_buffer, "%s on %s", argv[2], mount_point);
289 else if (description)
290 asprintf(&name_buffer, "%s (%s)", description, argv[2]);
292 name = name_buffer ? name_buffer : argv[2];
294 if ((k = crypt_init(&cd, argv[3]))) {
295 log_error("crypt_init() failed: %s", strerror(-k));
299 crypt_set_log_callback(cd, log_glue, NULL);
301 status = crypt_status(cd, argv[2]);
302 if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
303 log_info("Volume %s already active.", argv[2]);
309 flags |= CRYPT_ACTIVATE_READONLY;
311 until = now(CLOCK_MONOTONIC) + (opt_timeout > 0 ? opt_timeout : 60 * USEC_PER_SEC);
313 opt_tries = opt_tries > 0 ? opt_tries : 3;
314 opt_key_size = (opt_key_size > 0 ? opt_key_size : 256);
315 hash = opt_hash ? opt_hash : "ripemd160";
320 l = strcspn(opt_cipher, "-");
322 if (!(truncated_cipher = strndup(opt_cipher, l))) {
323 log_error("Out of memory");
327 cipher = truncated_cipher;
328 cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain";
331 cipher_mode = "cbc-essiv:sha256";
334 for (try = 0; try < opt_tries; try++) {
335 bool pass_volume_key = false;
337 strv_free(passwords);
344 if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) {
345 log_error("Out of memory");
349 k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords);
353 log_error("Failed to query password: %s", strerror(-k));
358 char **passwords2 = NULL;
360 assert(strv_length(passwords) == 1);
362 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) {
363 log_error("Out of memory");
367 k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2);
371 log_error("Failed to query verification password: %s", strerror(-k));
375 assert(strv_length(passwords2) == 1);
377 if (!streq(passwords[0], passwords2[0])) {
378 log_warning("Passwords did not match, retrying.");
379 strv_free(passwords2);
383 strv_free(passwords2);
386 strv_uniq(passwords);
388 STRV_FOREACH(p, passwords) {
391 if (strlen(*p)+1 >= opt_key_size)
394 /* Pad password if necessary */
395 if (!(c = new(char, opt_key_size))) {
396 log_error("Out of memory.");
400 strncpy(c, *p, opt_key_size);
406 if (!opt_type || streq(opt_type, CRYPT_LUKS1))
407 k = crypt_load(cd, CRYPT_LUKS1, NULL);
409 if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) {
410 struct crypt_params_plain params;
415 /* In contrast to what the name
416 * crypt_setup() might suggest this
417 * doesn't actually format anything,
418 * it just configures encryption
419 * parameters when used for plain
421 k = crypt_format(cd, CRYPT_PLAIN,
429 pass_volume_key = streq(hash, "plain");
433 log_error("Loading of cryptographic parameters failed: %s", strerror(-k));
437 log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
438 crypt_get_cipher(cd),
439 crypt_get_cipher_mode(cd),
440 crypt_get_volume_key_size(cd)*8,
444 k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, opt_key_size, flags);
448 STRV_FOREACH(p, passwords) {
451 k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags);
453 k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags);
464 log_error("Failed to activate: %s", strerror(-k));
468 log_warning("Invalid passphrase.");
471 if (try >= opt_tries) {
472 log_error("Too many attempts.");
477 } else if (streq(argv[1], "detach")) {
480 if ((k = crypt_init_by_name(&cd, argv[2]))) {
481 log_error("crypt_init() failed: %s", strerror(-k));
485 crypt_set_log_callback(cd, log_glue, NULL);
487 if ((k = crypt_deactivate(cd, argv[2])) < 0) {
488 log_error("Failed to deactivate: %s", strerror(-k));
493 log_error("Unknown verb %s.", argv[1]);
507 free(truncated_cipher);
509 strv_free(passwords);