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"
36 static const char *opt_type = NULL; /* LUKS1 or PLAIN */
37 static char *opt_cipher = NULL;
38 static unsigned opt_key_size = 0;
39 static char *opt_hash = NULL;
40 static unsigned opt_tries = 0;
41 static bool opt_readonly = false;
42 static bool opt_verify = false;
43 static usec_t opt_timeout = DEFAULT_TIMEOUT_USEC;
45 /* Options Debian's crypttab knows we don't:
57 static int parse_one_option(const char *option) {
60 /* Handled outside of this tool */
61 if (streq(option, "noauto"))
64 if (startswith(option, "cipher=")) {
67 if (!(t = strdup(option+7)))
73 } else if (startswith(option, "size=")) {
75 if (safe_atou(option+5, &opt_key_size) < 0) {
76 log_error("size= parse failure, ignoring.");
80 } else if (startswith(option, "hash=")) {
83 if (!(t = strdup(option+5)))
89 } else if (startswith(option, "tries=")) {
91 if (safe_atou(option+6, &opt_tries) < 0) {
92 log_error("tries= parse failure, ignoring.");
96 } else if (streq(option, "readonly"))
98 else if (streq(option, "verify"))
100 else if (streq(option, "luks"))
101 opt_type = CRYPT_LUKS1;
102 else if (streq(option, "plain") ||
103 streq(option, "swap") ||
104 streq(option, "tmp"))
105 opt_type = CRYPT_PLAIN;
106 else if (startswith(option, "timeout=")) {
108 if (parse_usec(option+8, &opt_timeout) < 0) {
109 log_error("timeout= parse failure, ignoring.");
113 } else if (!streq(option, "none"))
114 log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
119 static int parse_options(const char *options) {
126 FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
130 if (!(o = strndup(w, l)))
133 r = parse_one_option(o);
143 static void log_glue(int level, const char *msg, void *usrptr) {
144 log_debug("%s", msg);
147 static char *disk_description(const char *path) {
148 struct udev *udev = NULL;
149 struct udev_device *device = NULL;
151 char *description = NULL;
156 if (stat(path, &st) < 0)
159 if (!S_ISBLK(st.st_mode))
162 if (!(udev = udev_new()))
165 if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev)))
168 if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) ||
169 (model = udev_device_get_property_value(device, "ID_MODEL")) ||
170 (model = udev_device_get_property_value(device, "DM_NAME")))
171 description = strdup(model);
175 udev_device_unref(device);
183 static char *disk_mount_point(const char *label) {
184 char *mp = NULL, *device = NULL;
188 /* Yeah, we don't support native systemd unit files here for now */
190 if (asprintf(&device, "/dev/mapper/%s", label) < 0)
193 if (!(f = setmntent("/etc/fstab", "r")))
196 while ((m = getmntent(f)))
197 if (path_equal(m->mnt_fsname, device)) {
198 mp = strdup(m->mnt_dir);
211 static int help(void) {
213 printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n"
214 "%s detach VOLUME\n\n"
215 "Attaches or detaches an encrypted block device.\n",
216 program_invocation_short_name,
217 program_invocation_short_name);
222 int main(int argc, char *argv[]) {
223 int r = EXIT_FAILURE;
224 struct crypt_device *cd = NULL;
225 char **passwords = NULL, *truncated_cipher = NULL;
226 const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL;
227 char *description = NULL, *name_buffer = NULL, *mount_point = NULL;
228 unsigned keyfile_size = 0;
236 log_error("This program requires at least two arguments.");
240 log_set_target(LOG_TARGET_AUTO);
241 log_parse_environment();
246 if (streq(argv[1], "attach")) {
250 const char *key_file = NULL;
252 crypt_status_info status;
254 /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */
257 log_error("attach requires at least two arguments.");
263 !streq(argv[4], "-") &&
264 !streq(argv[4], "none")) {
266 if (!path_is_absolute(argv[4]))
267 log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
272 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
273 parse_options(argv[5]);
275 /* A delicious drop of snake oil */
276 mlockall(MCL_FUTURE);
278 description = disk_description(argv[3]);
279 mount_point = disk_mount_point(argv[2]);
281 if (description && streq(argv[2], description)) {
282 /* If the description string is simply the
283 * volume name, then let's not show this
289 if (mount_point && description)
290 asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point);
291 else if (mount_point)
292 asprintf(&name_buffer, "%s on %s", argv[2], mount_point);
293 else if (description)
294 asprintf(&name_buffer, "%s (%s)", description, argv[2]);
296 name = name_buffer ? name_buffer : argv[2];
298 if ((k = crypt_init(&cd, argv[3]))) {
299 log_error("crypt_init() failed: %s", strerror(-k));
303 crypt_set_log_callback(cd, log_glue, NULL);
305 status = crypt_status(cd, argv[2]);
306 if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) {
307 log_info("Volume %s already active.", argv[2]);
313 flags |= CRYPT_ACTIVATE_READONLY;
316 until = now(CLOCK_MONOTONIC) + opt_timeout;
320 opt_tries = opt_tries > 0 ? opt_tries : 3;
321 opt_key_size = (opt_key_size > 0 ? opt_key_size : 256);
322 hash = opt_hash ? opt_hash : "ripemd160";
327 l = strcspn(opt_cipher, "-");
329 if (!(truncated_cipher = strndup(opt_cipher, l))) {
330 log_error("Out of memory");
334 cipher = truncated_cipher;
335 cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain";
338 cipher_mode = "cbc-essiv:sha256";
341 for (try = 0; try < opt_tries; try++) {
342 bool pass_volume_key = false;
344 strv_free(passwords);
351 if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) {
352 log_error("Out of memory");
356 k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords);
360 log_error("Failed to query password: %s", strerror(-k));
365 char **passwords2 = NULL;
367 assert(strv_length(passwords) == 1);
369 if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) {
370 log_error("Out of memory");
374 k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2);
378 log_error("Failed to query verification password: %s", strerror(-k));
382 assert(strv_length(passwords2) == 1);
384 if (!streq(passwords[0], passwords2[0])) {
385 log_warning("Passwords did not match, retrying.");
386 strv_free(passwords2);
390 strv_free(passwords2);
393 strv_uniq(passwords);
395 STRV_FOREACH(p, passwords) {
398 if (strlen(*p)+1 >= opt_key_size)
401 /* Pad password if necessary */
402 if (!(c = new(char, opt_key_size))) {
403 log_error("Out of memory.");
407 strncpy(c, *p, opt_key_size);
415 if (!opt_type || streq(opt_type, CRYPT_LUKS1))
416 k = crypt_load(cd, CRYPT_LUKS1, NULL);
418 if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) {
419 struct crypt_params_plain params;
424 /* In contrast to what the name
425 * crypt_setup() might suggest this
426 * doesn't actually format anything,
427 * it just configures encryption
428 * parameters when used for plain
430 k = crypt_format(cd, CRYPT_PLAIN,
438 pass_volume_key = streq(hash, "plain");
440 /* for CRYPT_PLAIN limit reads
441 * from keyfile to key length */
442 keyfile_size = opt_key_size / 8;
446 log_error("Loading of cryptographic parameters failed: %s", strerror(-k));
450 log_info("Set cipher %s, mode %s, key size %i bits for device %s.",
451 crypt_get_cipher(cd),
452 crypt_get_cipher_mode(cd),
453 crypt_get_volume_key_size(cd)*8,
457 k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, keyfile_size, flags);
461 STRV_FOREACH(p, passwords) {
464 k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags);
466 k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags);
477 log_error("Failed to activate: %s", strerror(-k));
481 log_warning("Invalid passphrase.");
484 if (try >= opt_tries) {
485 log_error("Too many attempts.");
490 } else if (streq(argv[1], "detach")) {
493 if ((k = crypt_init_by_name(&cd, argv[2]))) {
494 log_error("crypt_init() failed: %s", strerror(-k));
498 crypt_set_log_callback(cd, log_glue, NULL);
500 if ((k = crypt_deactivate(cd, argv[2])) < 0) {
501 log_error("Failed to deactivate: %s", strerror(-k));
506 log_error("Unknown verb %s.", argv[1]);
520 free(truncated_cipher);
522 strv_free(passwords);