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
);