2 * libdevmapper - device-mapper backend for cryptsetup
4 * Copyright (C) 2004, Christophe Saout <christophe@saout.de>
5 * Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
6 * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <libdevmapper.h>
28 #include <uuid/uuid.h>
32 #define DM_UUID_LEN 129
33 #define DM_UUID_PREFIX "CRYPT-"
34 #define DM_UUID_PREFIX_LEN 6
35 #define DM_CRYPT_TARGET "crypt"
36 #define DM_VERITY_TARGET "verity"
39 /* Set if dm-crypt version was probed */
40 static int _dm_crypt_checked = 0;
41 static uint32_t _dm_crypt_flags = 0;
43 static int _dm_use_count = 0;
44 static struct crypt_device *_context = NULL;
46 /* Check if we have DM flag to instruct kernel to force wipe buffers */
47 #if !HAVE_DECL_DM_TASK_SECURE_DATA
48 static int dm_task_secure_data(struct dm_task *dmt) { return 1; }
51 /* Compatibility for old device-mapper without udev support */
52 #if HAVE_DECL_DM_UDEV_DISABLE_DISK_RULES_FLAG
53 #define CRYPT_TEMP_UDEV_FLAGS DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG | \
54 DM_UDEV_DISABLE_DISK_RULES_FLAG | \
55 DM_UDEV_DISABLE_OTHER_RULES_FLAG
56 #define _dm_task_set_cookie dm_task_set_cookie
57 #define _dm_udev_wait dm_udev_wait
59 #define CRYPT_TEMP_UDEV_FLAGS 0
60 static int _dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags) { return 0; }
61 static int _dm_udev_wait(uint32_t cookie) { return 0; };
64 static int _dm_use_udev(void)
66 #ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
67 return dm_udev_get_sync_support();
73 __attribute__((format(printf, 4, 5)))
74 static void set_dm_error(int level,
75 const char *file __attribute__((unused)),
76 int line __attribute__((unused)),
83 if (vasprintf(&msg, f, va) > 0) {
85 log_err(_context, msg);
86 log_err(_context, "\n");
94 static int _dm_simple(int task, const char *name, int udev_wait);
96 static void _dm_set_crypt_compat(const char *dm_version, unsigned crypt_maj,
97 unsigned crypt_min, unsigned crypt_patch)
99 unsigned dm_maj, dm_min, dm_patch;
101 if (sscanf(dm_version, "%u.%u.%u", &dm_maj, &dm_min, &dm_patch) != 3)
102 dm_maj = dm_min = dm_patch = 0;
104 log_dbg("Detected dm-crypt version %i.%i.%i, dm-ioctl version %u.%u.%u.",
105 crypt_maj, crypt_min, crypt_patch, dm_maj, dm_min, dm_patch);
107 if (crypt_maj >= 1 && crypt_min >= 2)
108 _dm_crypt_flags |= DM_KEY_WIPE_SUPPORTED;
110 log_dbg("Suspend and resume disabled, no wipe key support.");
112 if (crypt_maj >= 1 && crypt_min >= 10)
113 _dm_crypt_flags |= DM_LMK_SUPPORTED;
115 if (dm_maj >= 4 && dm_min >= 20)
116 _dm_crypt_flags |= DM_SECURE_SUPPORTED;
118 /* not perfect, 2.6.33 supports with 1.7.0 */
119 if (crypt_maj >= 1 && crypt_min >= 8)
120 _dm_crypt_flags |= DM_PLAIN64_SUPPORTED;
122 if (crypt_maj >= 1 && crypt_min >= 11)
123 _dm_crypt_flags |= DM_DISCARDS_SUPPORTED;
125 /* Repeat test if dm-crypt is not present */
127 _dm_crypt_checked = 1;
130 static void _dm_set_verity_compat(const char *dm_version, unsigned verity_maj,
131 unsigned verity_min, unsigned verity_patch)
134 _dm_crypt_flags |= DM_VERITY_SUPPORTED;
136 log_dbg("Detected dm-verity version %i.%i.%i.",
137 verity_maj, verity_min, verity_patch);
140 static int _dm_check_versions(void)
143 struct dm_versions *target, *last_target;
146 if (_dm_crypt_checked)
149 /* FIXME: add support to DM so it forces crypt target module load here */
150 if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
153 if (!dm_task_run(dmt)) {
154 dm_task_destroy(dmt);
158 if (!dm_task_get_driver_version(dmt, dm_version, sizeof(dm_version))) {
159 dm_task_destroy(dmt);
163 target = dm_task_get_versions(dmt);
165 last_target = target;
166 if (!strcmp(DM_CRYPT_TARGET, target->name)) {
167 _dm_set_crypt_compat(dm_version,
168 (unsigned)target->version[0],
169 (unsigned)target->version[1],
170 (unsigned)target->version[2]);
171 } else if (!strcmp(DM_VERITY_TARGET, target->name)) {
172 _dm_set_verity_compat(dm_version,
173 (unsigned)target->version[0],
174 (unsigned)target->version[1],
175 (unsigned)target->version[2]);
177 target = (struct dm_versions *)((char *) target + target->next);
178 } while (last_target != target);
180 dm_task_destroy(dmt);
184 uint32_t dm_flags(void)
186 if (!_dm_crypt_checked)
187 _dm_check_versions();
189 return _dm_crypt_flags;
192 int dm_init(struct crypt_device *context, int check_kernel)
194 if (!_dm_use_count++) {
195 log_dbg("Initialising device-mapper backend%s, UDEV is %sabled.",
196 check_kernel ? "" : " (NO kernel check requested)",
197 _dm_use_udev() ? "en" : "dis");
198 if (check_kernel && !_dm_check_versions()) {
199 log_err(context, _("Cannot initialize device-mapper. Is dm_mod kernel module loaded?\n"));
202 if (getuid() || geteuid())
203 log_dbg(("WARNING: Running as a non-root user. Functionality may be unavailable."));
204 dm_log_init(set_dm_error);
205 dm_log_init_verbose(10);
208 // FIXME: global context is not safe
212 return 1; /* unsafe memory */
217 if (_dm_use_count && (!--_dm_use_count)) {
218 log_dbg("Releasing device-mapper backend.");
219 dm_log_init_verbose(0);
226 /* Return path to DM device */
227 char *dm_device_path(const char *prefix, int major, int minor)
233 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
235 if (!dm_task_set_minor(dmt, minor) ||
236 !dm_task_set_major(dmt, major) ||
238 !(name = dm_task_get_name(dmt))) {
239 dm_task_destroy(dmt);
243 if (snprintf(path, sizeof(path), "%s%s", prefix ?: "", name) < 0)
246 dm_task_destroy(dmt);
251 static void hex_key(char *hexkey, size_t key_size, const char *key)
255 for(i = 0; i < key_size; i++)
256 sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
259 static int hex_to_bytes(const char *hex, char *result)
261 char buf[3] = "xx\0", *endp;
264 len = strlen(hex) / 2;
265 for (i = 0; i < len; i++) {
266 memcpy(buf, &hex[i * 2], 2);
267 result[i] = strtoul(buf, &endp, 16);
274 /* http://code.google.com/p/cryptsetup/wiki/DMCrypt */
275 static char *get_dm_crypt_params(struct crypt_dm_active_device *dmd)
277 int r, max_size, null_cipher = 0;
278 char *params, *hexkey;
279 const char *features = "";
284 if (dmd->flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) {
285 if (dm_flags() & DM_DISCARDS_SUPPORTED) {
286 features = " 1 allow_discards";
287 log_dbg("Discard/TRIM is allowed.");
289 log_dbg("Discard/TRIM is not supported by the kernel.");
292 if (!strncmp(dmd->u.crypt.cipher, "cipher_null-", 12))
295 hexkey = crypt_safe_alloc(null_cipher ? 2 : (dmd->u.crypt.vk->keylength * 2 + 1));
300 strncpy(hexkey, "-", 2);
302 hex_key(hexkey, dmd->u.crypt.vk->keylength, dmd->u.crypt.vk->key);
304 max_size = strlen(hexkey) + strlen(dmd->u.crypt.cipher) +
305 strlen(dmd->data_device) + strlen(features) + 64;
306 params = crypt_safe_alloc(max_size);
310 r = snprintf(params, max_size, "%s %s %" PRIu64 " %s %" PRIu64 "%s",
311 dmd->u.crypt.cipher, hexkey, dmd->u.crypt.iv_offset,
312 dmd->data_device, dmd->u.crypt.offset, features);
313 if (r < 0 || r >= max_size) {
314 crypt_safe_free(params);
318 crypt_safe_free(hexkey);
322 /* http://code.google.com/p/cryptsetup/wiki/DMVerity */
323 static char *get_dm_verity_params(struct crypt_params_verity *vp,
324 struct crypt_dm_active_device *dmd)
327 char *params = NULL, *hexroot = NULL, *hexsalt = NULL;
332 hexroot = crypt_safe_alloc(dmd->u.verity.root_hash_size * 2 + 1);
335 hex_key(hexroot, dmd->u.verity.root_hash_size, dmd->u.verity.root_hash);
337 hexsalt = crypt_safe_alloc(vp->salt_size ? vp->salt_size * 2 + 1 : 2);
341 hex_key(hexsalt, vp->salt_size, vp->salt);
343 strncpy(hexsalt, "-", 2);
345 max_size = strlen(hexroot) + strlen(hexsalt) +
346 strlen(dmd->data_device) +
347 strlen(dmd->u.verity.hash_device) +
348 strlen(vp->hash_name) + 128;
350 params = crypt_safe_alloc(max_size);
354 r = snprintf(params, max_size,
355 "%u %s %s %u %u %" PRIu64 " %" PRIu64 " %s %s %s",
356 vp->version, dmd->data_device,
357 dmd->u.verity.hash_device,
358 vp->data_block_size, vp->hash_block_size,
359 vp->data_size, dmd->u.verity.hash_offset,
360 vp->hash_name, hexroot, hexsalt);
361 if (r < 0 || r >= max_size) {
362 crypt_safe_free(params);
365 log_dbg("TABLE: %s", params);
367 crypt_safe_free(hexroot);
368 crypt_safe_free(hexsalt);
374 static int _dm_simple(int task, const char *name, int udev_wait)
383 if (!(dmt = dm_task_create(task)))
386 if (name && !dm_task_set_name(dmt, name))
389 #if HAVE_DECL_DM_TASK_RETRY_REMOVE
390 /* Used only in DM_DEVICE_REMOVE */
391 if (name && !dm_task_retry_remove(dmt))
394 if (udev_wait && !_dm_task_set_cookie(dmt, &cookie, 0))
397 r = dm_task_run(dmt);
400 (void)_dm_udev_wait(cookie);
403 dm_task_destroy(dmt);
407 static int _error_device(const char *name, size_t size)
412 if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
415 if (!dm_task_set_name(dmt, name))
418 if (!dm_task_add_target(dmt, UINT64_C(0), size, "error", ""))
421 if (!dm_task_set_ro(dmt))
424 if (!dm_task_no_open_count(dmt))
427 if (!dm_task_run(dmt))
430 if (!_dm_simple(DM_DEVICE_RESUME, name, 1)) {
431 _dm_simple(DM_DEVICE_CLEAR, name, 0);
438 dm_task_destroy(dmt);
442 int dm_remove_device(const char *name, int force, uint64_t size)
445 int retries = force ? RETRY_COUNT : 1;
446 int error_target = 0;
448 if (!name || (force && !size))
452 r = _dm_simple(DM_DEVICE_REMOVE, name, 1) ? 0 : -EINVAL;
453 if (--retries && r) {
454 log_dbg("WARNING: other process locked internal device %s, %s.",
455 name, retries ? "retrying remove" : "giving up");
456 if (force && (crypt_get_debug_level() == CRYPT_LOG_DEBUG))
457 debug_processes_using_device(name);
459 if (force && !error_target) {
460 /* If force flag is set, replace device with error, read-only target.
461 * it should stop processes from reading it and also removed underlying
462 * device from mapping, so it is usable again.
463 * Force flag should be used only for temporary devices, which are
464 * intended to work inside cryptsetup only!
465 * Anyway, if some process try to read temporary cryptsetup device,
466 * it is bug - no other process should try touch it (e.g. udev).
468 _error_device(name, size);
472 } while (r == -EINVAL && retries);
474 dm_task_update_nodes();
479 #define UUID_LEN 37 /* 36 + \0, libuuid ... */
481 * UUID has format: CRYPT-<devicetype>-[<uuid>-]<device name>
483 * CRYPT-LUKS1-00000000000000000000000000000000-name
486 static void dm_prepare_uuid(const char *name, const char *type, const char *uuid, char *buf, size_t buflen)
488 char *ptr, uuid2[UUID_LEN] = {0};
492 /* Remove '-' chars */
493 if (uuid && !uuid_parse(uuid, uu)) {
494 for (ptr = uuid2, i = 0; i < UUID_LEN; i++)
495 if (uuid[i] != '-') {
501 i = snprintf(buf, buflen, DM_UUID_PREFIX "%s%s%s%s%s",
502 type ?: "", type ? "-" : "",
503 uuid2[0] ? uuid2 : "", uuid2[0] ? "-" : "",
506 log_dbg("DM-UUID is %s", buf);
508 log_err(NULL, _("DM-UUID for device %s was truncated.\n"), name);
511 static int _dm_create_device(const char *name, const char *type,
512 const char *device, uint32_t flags,
513 const char *uuid, uint64_t size,
514 char *params, int reload)
516 struct dm_task *dmt = NULL;
518 char dev_uuid[DM_UUID_LEN] = {0};
520 uint32_t read_ahead = 0;
522 uint16_t udev_flags = 0;
524 if (flags & CRYPT_ACTIVATE_PRIVATE)
525 udev_flags = CRYPT_TEMP_UDEV_FLAGS;
527 /* All devices must have DM_UUID, only resize on old device is exception */
529 if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
532 if (!dm_task_set_name(dmt, name))
535 dm_prepare_uuid(name, type, uuid, dev_uuid, sizeof(dev_uuid));
537 if (!(dmt = dm_task_create(DM_DEVICE_CREATE)))
540 if (!dm_task_set_name(dmt, name))
543 if (!dm_task_set_uuid(dmt, dev_uuid))
546 if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
550 if ((dm_flags() & DM_SECURE_SUPPORTED) && !dm_task_secure_data(dmt))
552 if ((flags & CRYPT_ACTIVATE_READONLY) && !dm_task_set_ro(dmt))
555 if (!dm_task_add_target(dmt, 0, size,
556 !strcmp("VERITY", type) ? DM_VERITY_TARGET : DM_CRYPT_TARGET, params))
559 #ifdef DM_READ_AHEAD_MINIMUM_FLAG
560 if (device_read_ahead(device, &read_ahead) &&
561 !dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
565 if (!dm_task_run(dmt))
569 dm_task_destroy(dmt);
570 if (!(dmt = dm_task_create(DM_DEVICE_RESUME)))
572 if (!dm_task_set_name(dmt, name))
574 if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
576 if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
578 if (!dm_task_run(dmt))
582 if (!dm_task_get_info(dmt, &dmi))
587 if (_dm_use_udev()) {
588 (void)_dm_udev_wait(cookie);
592 if (r < 0 && !reload)
593 dm_remove_device(name, 0, 0);
596 if (cookie && _dm_use_udev())
597 (void)_dm_udev_wait(cookie);
600 crypt_safe_free(params);
602 dm_task_destroy(dmt);
604 dm_task_update_nodes();
608 int dm_create_device(const char *name,
610 struct crypt_dm_active_device *dmd,
613 char *table_params = NULL;
615 if (dmd->target == DM_CRYPT)
616 table_params = get_dm_crypt_params(dmd);
617 else if (dmd->target == DM_VERITY)
618 table_params = get_dm_verity_params(dmd->u.verity.vp, dmd);
623 return _dm_create_device(name, type, dmd->data_device, dmd->flags,
624 dmd->uuid, dmd->size, table_params, reload);
627 static int dm_status_dmi(const char *name, struct dm_info *dmi,
628 const char *target, char **status_line)
631 uint64_t start, length;
632 char *target_type, *params = NULL;
636 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
639 if (!dm_task_set_name(dmt, name))
642 if (!dm_task_run(dmt))
645 if (!dm_task_get_info(dmt, dmi))
653 next = dm_get_next_target(dmt, next, &start, &length,
654 &target_type, ¶ms);
656 if (!target_type || start != 0 || next)
659 if (target && strcmp(target_type, target))
662 /* for target == NULL check all supported */
663 if (!target && (strcmp(target_type, DM_CRYPT_TARGET) &&
664 strcmp(target_type, DM_VERITY_TARGET)))
668 if (!r && status_line && !(*status_line = strdup(params)))
672 dm_task_destroy(dmt);
677 int dm_status_device(const char *name)
682 r = dm_status_dmi(name, &dmi, NULL, NULL);
686 return (dmi.open_count > 0);
689 int dm_status_suspended(const char *name)
694 r = dm_status_dmi(name, &dmi, DM_CRYPT_TARGET, NULL);
698 return dmi.suspended ? 1 : 0;
701 int dm_status_verity_ok(const char *name)
705 char *status_line = NULL;
707 r = dm_status_dmi(name, &dmi, DM_VERITY_TARGET, &status_line);
708 if (r < 0 || !status_line) {
713 log_dbg("Verity volume %s status is %s.", name, status_line ?: "");
714 r = status_line[0] == 'V' ? 1 : 0;
720 /* FIXME use hex wrapper, user val wrappers for line parsing */
721 static int _dm_query_crypt(uint32_t get_flags,
724 struct crypt_dm_active_device *dmd)
727 char *rcipher, *key_, *rdevice, *endp, buffer[3], *arg;
730 memset(dmd, 0, sizeof(*dmd));
731 dmd->target = DM_CRYPT;
733 rcipher = strsep(¶ms, " ");
735 if (get_flags & DM_ACTIVE_CRYPT_CIPHER)
736 dmd->u.crypt.cipher = strdup(rcipher);
739 key_ = strsep(¶ms, " ");
742 val64 = strtoull(params, ¶ms, 10);
747 dmd->u.crypt.iv_offset = val64;
750 rdevice = strsep(¶ms, " ");
751 if (get_flags & DM_ACTIVE_DEVICE)
752 dmd->data_device = crypt_lookup_dev(rdevice);
757 val64 = strtoull(params, ¶ms, 10);
758 dmd->u.crypt.offset = val64;
760 /* Features section, available since crypt target version 1.11 */
766 /* Number of arguments */
767 val64 = strtoull(params, ¶ms, 10);
772 for (i = 0; i < val64; i++) {
775 arg = strsep(¶ms, " ");
776 if (!strcasecmp(arg, "allow_discards"))
777 dmd->flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
778 else /* unknown option */
782 /* All parameters shold be processed */
787 /* Never allow to return empty key */
788 if ((get_flags & DM_ACTIVE_CRYPT_KEY) && dmi->suspended) {
789 log_dbg("Cannot read volume key while suspended.");
793 if (get_flags & DM_ACTIVE_CRYPT_KEYSIZE) {
794 dmd->u.crypt.vk = crypt_alloc_volume_key(strlen(key_) / 2, NULL);
795 if (!dmd->u.crypt.vk)
798 if (get_flags & DM_ACTIVE_CRYPT_KEY) {
800 for(i = 0; i < dmd->u.crypt.vk->keylength; i++) {
801 memcpy(buffer, &key_[i * 2], 2);
802 dmd->u.crypt.vk->key[i] = strtoul(buffer, &endp, 16);
803 if (endp != &buffer[2]) {
804 crypt_free_volume_key(dmd->u.crypt.vk);
805 dmd->u.crypt.vk = NULL;
811 memset(key_, 0, strlen(key_));
816 static int _dm_query_verity(uint32_t get_flags,
819 struct crypt_dm_active_device *dmd)
821 struct crypt_params_verity *vp = NULL;
827 if (get_flags & DM_ACTIVE_VERITY_PARAMS)
828 vp = dmd->u.verity.vp;
830 memset(dmd, 0, sizeof(*dmd));
832 dmd->target = DM_VERITY;
833 dmd->u.verity.vp = vp;
836 val32 = strtoul(params, ¶ms, 10);
844 str = strsep(¶ms, " ");
847 if (get_flags & DM_ACTIVE_DEVICE)
848 dmd->data_device = crypt_lookup_dev(str);
851 str = strsep(¶ms, " ");
854 if (get_flags & DM_ACTIVE_VERITY_HASH_DEVICE)
855 dmd->u.verity.hash_device = crypt_lookup_dev(str);
858 val32 = strtoul(params, ¶ms, 10);
862 vp->data_block_size = val32;
865 /* hash block size */
866 val32 = strtoul(params, ¶ms, 10);
870 vp->hash_block_size = val32;
874 val64 = strtoull(params, ¶ms, 10);
878 vp->data_size = val64;
882 val64 = strtoull(params, ¶ms, 10);
885 dmd->u.verity.hash_offset = val64;
889 str = strsep(¶ms, " ");
893 vp->hash_name = strdup(str);
896 str = strsep(¶ms, " ");
899 len = strlen(str) / 2;
900 dmd->u.verity.root_hash_size = len;
901 if (get_flags & DM_ACTIVE_VERITY_ROOT_HASH) {
902 if (!(str2 = malloc(len)))
904 if (hex_to_bytes(str, str2) != len)
906 dmd->u.verity.root_hash = str2;
910 str = strsep(¶ms, " ");
914 len = strlen(str) / 2;
916 if (!(str2 = malloc(len)))
918 if (hex_to_bytes(str, str2) != len)
926 int dm_query_device(const char *name, uint32_t get_flags,
927 struct crypt_dm_active_device *dmd)
931 uint64_t start, length;
932 char *target_type, *params;
933 const char *tmp_uuid;
937 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
939 if ((dm_flags() & DM_SECURE_SUPPORTED) && !dm_task_secure_data(dmt))
941 if (!dm_task_set_name(dmt, name))
944 if (!dm_task_run(dmt))
948 if (!dm_task_get_info(dmt, &dmi))
956 next = dm_get_next_target(dmt, next, &start, &length,
957 &target_type, ¶ms);
959 if (!target_type || start != 0 || next)
962 if (!strcmp(target_type, DM_CRYPT_TARGET)) {
963 r = _dm_query_crypt(get_flags, &dmi, params, dmd);
964 } else if (!strcmp(target_type, DM_VERITY_TARGET)) {
965 r = _dm_query_verity(get_flags, &dmi, params, dmd);
968 r = dm_status_verity_ok(name);
972 dmd->flags |= CRYPT_ACTIVATE_CORRUPTED;
983 dmd->flags |= CRYPT_ACTIVATE_READONLY;
985 tmp_uuid = dm_task_get_uuid(dmt);
987 dmd->flags |= CRYPT_ACTIVATE_NO_UUID;
988 else if (get_flags & DM_ACTIVE_UUID) {
989 if (!strncmp(tmp_uuid, DM_UUID_PREFIX, DM_UUID_PREFIX_LEN))
990 dmd->uuid = strdup(tmp_uuid + DM_UUID_PREFIX_LEN);
993 r = (dmi.open_count > 0);
996 dm_task_destroy(dmt);
1001 static int _dm_message(const char *name, const char *msg)
1004 struct dm_task *dmt;
1006 if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
1009 if ((dm_flags() & DM_SECURE_SUPPORTED) && !dm_task_secure_data(dmt))
1012 if (name && !dm_task_set_name(dmt, name))
1015 if (!dm_task_set_sector(dmt, (uint64_t) 0))
1018 if (!dm_task_set_message(dmt, msg))
1021 r = dm_task_run(dmt);
1024 dm_task_destroy(dmt);
1028 int dm_suspend_and_wipe_key(const char *name)
1030 if (!_dm_check_versions())
1033 if (!(_dm_crypt_flags & DM_KEY_WIPE_SUPPORTED))
1036 if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0))
1039 if (!_dm_message(name, "key wipe")) {
1040 _dm_simple(DM_DEVICE_RESUME, name, 1);
1047 int dm_resume_and_reinstate_key(const char *name,
1051 int msg_size = key_size * 2 + 10; // key set <key>
1055 if (!_dm_check_versions())
1058 if (!(_dm_crypt_flags & DM_KEY_WIPE_SUPPORTED))
1061 msg = crypt_safe_alloc(msg_size);
1065 memset(msg, 0, msg_size);
1066 strcpy(msg, "key set ");
1067 hex_key(&msg[8], key_size, key);
1069 if (!_dm_message(name, msg) ||
1070 !_dm_simple(DM_DEVICE_RESUME, name, 1))
1073 crypt_safe_free(msg);
1077 const char *dm_get_dir(void)
1082 int dm_is_dm_device(int major, int minor)
1084 return dm_is_dm_major((uint32_t)major);
1087 int dm_is_dm_kernel_name(const char *name)
1089 return strncmp(name, "dm-", 3) ? 0 : 1;
1092 int dm_check_segment(const char *name, uint64_t offset, uint64_t size)
1094 struct crypt_dm_active_device dmd;
1097 log_dbg("Checking segments for device %s.", name);
1099 r = dm_query_device(name, 0, &dmd);
1103 if (offset >= (dmd.u.crypt.offset + dmd.size) ||
1104 (offset + size) <= dmd.u.crypt.offset)
1109 log_dbg("seg: %" PRIu64 " - %" PRIu64 ", new %" PRIu64 " - %" PRIu64 "%s",
1110 dmd.u.crypt.offset, dmd.u.crypt.offset + dmd.size, offset, offset + size,
1111 r ? " (overlapping)" : " (ok)");