2 * cryptsetup-reencrypt - crypt utility for offline re-encryption
4 * Copyright (C) 2012, Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2012-2013, Milan Broz All rights reserved.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
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.
22 #include "cryptsetup.h"
23 #include <sys/ioctl.h>
26 #include <arpa/inet.h>
28 #define PACKAGE_REENC "crypt_reencrypt"
30 #define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee"
31 #define MAX_BCK_SECTORS 8192
33 static const char *opt_cipher = NULL;
34 static const char *opt_hash = NULL;
35 static const char *opt_key_file = NULL;
36 static long opt_keyfile_size = 0;
37 static long opt_keyfile_offset = 0;
38 static int opt_iteration_time = 1000;
39 static int opt_version_mode = 0;
40 static int opt_random = 0;
41 static int opt_urandom = 0;
42 static int opt_bsize = 4;
43 static int opt_directio = 0;
44 static int opt_fsync = 0;
45 static int opt_write_log = 0;
46 static int opt_tries = 3;
47 static int opt_key_slot = CRYPT_ANY_SLOT;
48 static int opt_key_size = 0;
49 static int opt_new = 0;
51 static const char *opt_reduce_size_str = NULL;
52 static uint64_t opt_reduce_size = 0;
54 static const char *opt_device_size_str = NULL;
55 static uint64_t opt_device_size = 0;
57 static const char **action_argv;
63 uint64_t device_size; /* overrided by parameter */
64 uint64_t device_size_real;
65 uint64_t device_offset;
66 uint64_t device_shift;
69 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
71 char header_file_org[PATH_MAX];
72 char header_file_new[PATH_MAX];
73 char log_file[PATH_MAX];
75 char crypt_path_org[PATH_MAX];
76 char crypt_path_new[PATH_MAX];
86 struct timeval start_time, end_time;
87 uint64_t resume_bytes;
90 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
91 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
101 static void _quiet_log(int level, const char *msg, void *usrptr)
105 tool_log(level, msg, usrptr);
108 /* The difference in seconds between two times in "timeval" format. */
109 static double time_diff(struct timeval start, struct timeval end)
111 return (end.tv_sec - start.tv_sec)
112 + (end.tv_usec - start.tv_usec) / 1E6;
115 static int alignment(int fd)
119 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
125 /* Depends on the first two fields of LUKS1 header format, magic and version */
126 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
133 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
135 if (errno == EBUSY) {
136 log_err(_("Cannot exclusively open %s, device in use.\n"),
140 log_err(_("Cannot open device %s\n"), rc->device);
144 if (set_magic == CHECK_OPEN) {
149 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
150 log_err(_("Allocation of aligned memory failed.\n"));
155 s = read(devfd, buf, SECTOR_SIZE);
156 if (s < 0 || s != SECTOR_SIZE) {
157 log_err(_("Cannot read device %s.\n"), rc->device);
162 /* Be sure that we do not process new version of header */
163 memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
164 version = ntohs(version);
166 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
168 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
169 memcpy(buf, NOMAGIC, MAGIC_L);
171 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
173 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
174 memcpy(buf, MAGIC, MAGIC_L);
176 } else if (set_magic == CHECK_UNUSABLE && version == 1) {
177 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
179 rc->device_uuid = strndup(&buf[0xa8], 40);
185 if (lseek(devfd, 0, SEEK_SET) == -1)
187 s = write(devfd, buf, SECTOR_SIZE);
188 if (s < 0 || s != SECTOR_SIZE) {
189 log_err(_("Cannot write device %s.\n"), rc->device);
193 log_dbg("LUKS signature check failed for %s.", rc->device);
196 memset(buf, 0, SECTOR_SIZE);
202 static int create_empty_header(const char *new_file, const char *old_file,
203 uint64_t data_sector)
210 /* Never create header > 4MiB */
211 if (data_sector > MAX_BCK_SECTORS)
212 data_sector = MAX_BCK_SECTORS;
214 /* new header file of the same size as old backup */
216 if (stat(old_file, &st) == -1 ||
217 (st.st_mode & S_IFMT) != S_IFREG ||
218 (st.st_size > 16 * 1024 * 1024))
224 * if requesting key size change, try to use offset
225 * here can be enough space to fit new key.
228 size = data_sector * SECTOR_SIZE;
230 /* if reducing size, be sure we have enough space */
232 size += opt_reduce_size;
234 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
236 if (!size || !(buf = malloc(size)))
238 memset(buf, 0, size);
240 fd = creat(new_file, S_IRUSR|S_IWUSR);
246 if (write(fd, buf, size) < size)
254 static int write_log(struct reenc_ctx *rc)
258 memset(rc->log_buf, 0, SECTOR_SIZE);
259 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
260 "version = %d\nUUID = %s\ndirection = %d\n"
261 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
262 1, rc->device_uuid, rc->reencrypt_direction,
263 rc->device_offset, rc->device_shift);
265 if (lseek(rc->log_fd, 0, SEEK_SET) == -1)
268 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
269 if (r < 0 || r != SECTOR_SIZE) {
270 log_err(_("Cannot write reencryption log file.\n"));
277 static int parse_line_log(struct reenc_ctx *rc, const char *line)
283 /* whole line is comment */
287 if (sscanf(line, "version = %d", &i) == 1) {
289 log_dbg("Log: Unexpected version = %i", i);
292 } else if (sscanf(line, "UUID = %40s", s) == 1) {
293 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
294 log_dbg("Log: Unexpected UUID %s", s);
297 } else if (sscanf(line, "direction = %d", &i) == 1) {
298 log_dbg("Log: direction = %i", i);
299 rc->reencrypt_direction = i;
300 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
301 log_dbg("Log: offset = %" PRIu64, u64);
302 rc->device_offset = u64;
303 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
304 log_dbg("Log: shift = %" PRIu64, u64);
305 rc->device_shift = u64;
312 static int parse_log(struct reenc_ctx *rc)
317 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
319 log_err(_("Cannot read reencryption log file.\n"));
323 rc->log_buf[SECTOR_SIZE - 1] = '\0';
326 end = strchr(start, '\n');
329 if (parse_line_log(rc, start)) {
330 log_err("Wrong log format.\n");
341 static void close_log(struct reenc_ctx *rc)
343 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
344 if (rc->log_fd != -1)
350 static int open_log(struct reenc_ctx *rc)
352 int flags = opt_directio ? O_DIRECT : 0;
354 rc->log_fd = open(rc->log_file, O_RDWR|O_EXCL|O_CREAT|flags, S_IRUSR|S_IWUSR);
355 if (rc->log_fd != -1) {
356 log_dbg("Created LUKS reencryption log file %s.", rc->log_file);
357 } else if (errno == EEXIST) {
358 log_std(_("Log file %s exists, resuming reencryption.\n"), rc->log_file);
359 rc->log_fd = open(rc->log_file, O_RDWR|flags);
363 if (rc->log_fd == -1)
366 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
367 log_err(_("Allocation of aligned memory failed.\n"));
372 if (!rc->in_progress && write_log(rc) < 0) {
377 /* Be sure it is correct format */
378 return parse_log(rc);
381 static int activate_luks_headers(struct reenc_ctx *rc)
383 struct crypt_device *cd = NULL, *cd_new = NULL;
386 log_dbg("Activating LUKS devices from headers.");
388 if ((r = crypt_init(&cd, rc->header_file_org)) ||
389 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
390 (r = crypt_set_data_device(cd, rc->device)))
393 log_verbose(_("Activating temporary device using old LUKS header.\n"));
394 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
395 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
396 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
399 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
400 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
401 (r = crypt_set_data_device(cd_new, rc->device)))
404 log_verbose(_("Activating temporary device using new LUKS header.\n"));
405 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
406 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
407 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
414 log_err(_("Activation of temporary devices failed.\n"));
418 static int create_new_header(struct reenc_ctx *rc, const char *cipher,
419 const char *cipher_mode, const char *uuid,
420 int key_size, struct crypt_params_luks1 *params)
422 struct crypt_device *cd_new = NULL;
425 if ((r = crypt_init(&cd_new, rc->header_file_new)))
429 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
430 else if (opt_urandom)
431 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
433 if (opt_iteration_time)
434 crypt_set_iteration_time(cd_new, opt_iteration_time);
436 if ((r = crypt_format(cd_new, CRYPT_LUKS1, cipher, cipher_mode,
437 uuid, NULL, key_size, params)))
439 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
441 for (i = 0; i < MAX_SLOT; i++) {
442 if (!rc->p[i].password)
444 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
445 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
447 log_verbose(_("Activated keyslot %i.\n"), r);
455 static int backup_luks_headers(struct reenc_ctx *rc)
457 struct crypt_device *cd = NULL;
458 struct crypt_params_luks1 params = {0};
459 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
462 log_dbg("Creating LUKS header backup for device %s.", rc->device);
464 if ((r = crypt_init(&cd, rc->device)) ||
465 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
468 crypt_set_confirm_callback(cd, NULL, NULL);
469 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
471 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
473 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
474 crypt_get_data_offset(cd))))
477 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
478 params.data_alignment = crypt_get_data_offset(cd);
479 params.data_alignment += ROUND_SECTOR(opt_reduce_size);
480 params.data_device = rc->device;
483 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
485 log_err(_("No known cipher specification pattern detected.\n"));
490 r = create_new_header(rc,
491 opt_cipher ? cipher : crypt_get_cipher(cd),
492 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
494 opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
499 log_err(_("Creation of LUKS backup headers failed.\n"));
503 /* Create fake header for original device */
504 static int backup_fake_header(struct reenc_ctx *rc)
506 struct crypt_device *cd_new = NULL;
507 struct crypt_params_luks1 params = {0};
508 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
512 log_dbg("Creating fake (cipher_null) header for original device.");
515 opt_key_size = DEFAULT_LUKS1_KEYBITS;
518 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
520 log_err(_("No known cipher specification pattern detected.\n"));
525 r = create_empty_header(rc->header_file_org, NULL, 0);
529 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
530 params.data_alignment = 0;
531 params.data_device = rc->device;
533 r = crypt_init(&cd_new, rc->header_file_org);
537 r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb",
538 NO_UUID, NULL, opt_key_size / 8, ¶ms);
542 r = crypt_keyslot_add_by_volume_key(cd_new, 0, NULL, 0,
543 rc->p[0].password, rc->p[0].passwordLen);
547 r = create_empty_header(rc->header_file_new, rc->header_file_org, 0);
551 params.data_alignment = ROUND_SECTOR(opt_reduce_size);
552 r = create_new_header(rc,
553 opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER,
554 opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE,
556 (opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8,
563 static void remove_headers(struct reenc_ctx *rc)
565 struct crypt_device *cd = NULL;
567 log_dbg("Removing headers.");
569 if (crypt_init(&cd, NULL))
571 crypt_set_log_callback(cd, _quiet_log, NULL);
572 if (*rc->header_file_org)
573 (void)crypt_deactivate(cd, rc->header_file_org);
574 if (*rc->header_file_new)
575 (void)crypt_deactivate(cd, rc->header_file_new);
579 static int restore_luks_header(struct reenc_ctx *rc)
581 struct crypt_device *cd = NULL;
584 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
586 r = crypt_init(&cd, rc->device);
588 crypt_set_confirm_callback(cd, NULL, NULL);
589 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
594 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
596 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
600 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
602 unsigned long long mbytes, eta;
603 struct timeval now_time;
606 gettimeofday(&now_time, NULL);
607 if (!final && time_diff(rc->end_time, now_time) < 0.5)
610 rc->end_time = now_time;
615 tdiff = time_diff(rc->start_time, rc->end_time);
619 mbytes = (bytes - rc->resume_bytes) / 1024 / 1024;
620 mib = (double)(mbytes) / tdiff;
624 /* FIXME: calculate this from last minute only and remaining space */
625 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
627 /* vt100 code clear line */
629 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
630 "%4llu MiB written, speed %5.1f MiB/s%s"),
631 (double)bytes / rc->device_size * 100,
632 eta / 60, eta % 60, mbytes, mib,
636 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
637 size_t block_size, void *buf, uint64_t *bytes)
641 log_dbg("Reencrypting in forward direction.");
643 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
644 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
645 log_err(_("Cannot seek to device offset.\n"));
649 rc->resume_bytes = *bytes = rc->device_offset;
651 if (write_log(rc) < 0)
654 while (!quit && rc->device_offset < rc->device_size) {
655 s1 = read(fd_old, buf, block_size);
656 if (s1 < 0 || ((size_t)s1 != block_size &&
657 (rc->device_offset + s1) != rc->device_size)) {
658 log_dbg("Read error, expecting %d, got %d.",
659 (int)block_size, (int)s1);
663 /* If device_size is forced, never write more than limit */
664 if ((s1 + rc->device_offset) > rc->device_size)
665 s1 = rc->device_size - rc->device_offset;
667 s2 = write(fd_new, buf, s1);
669 log_dbg("Write error, expecting %d, got %d.",
670 (int)block_size, (int)s2);
674 rc->device_offset += s1;
675 if (opt_write_log && write_log(rc) < 0)
678 if (opt_fsync && fsync(fd_new) < 0) {
679 log_dbg("Write error, fsync.");
683 *bytes += (uint64_t)s2;
684 print_progress(rc, *bytes, 0);
687 return quit ? -EAGAIN : 0;
690 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
691 size_t block_size, void *buf, uint64_t *bytes)
693 ssize_t s1, s2, working_block;
694 off64_t working_offset;
696 log_dbg("Reencrypting in backward direction.");
698 if (!rc->in_progress) {
699 rc->device_offset = rc->device_size;
700 rc->resume_bytes = 0;
703 rc->resume_bytes = rc->device_size - rc->device_offset;
704 *bytes = rc->resume_bytes;
707 if (write_log(rc) < 0)
710 while (!quit && rc->device_offset) {
711 if (rc->device_offset < block_size) {
713 working_block = rc->device_offset;
715 working_offset = rc->device_offset - block_size;
716 working_block = block_size;
719 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
720 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
721 log_err(_("Cannot seek to device offset.\n"));
725 s1 = read(fd_old, buf, working_block);
726 if (s1 < 0 || (s1 != working_block)) {
727 log_dbg("Read error, expecting %d, got %d.",
728 (int)block_size, (int)s1);
732 s2 = write(fd_new, buf, working_block);
734 log_dbg("Write error, expecting %d, got %d.",
735 (int)block_size, (int)s2);
739 rc->device_offset -= s1;
740 if (opt_write_log && write_log(rc) < 0)
743 if (opt_fsync && fsync(fd_new) < 0) {
744 log_dbg("Write error, fsync.");
748 *bytes += (uint64_t)s2;
749 print_progress(rc, *bytes, 0);
752 return quit ? -EAGAIN : 0;
755 static int copy_data(struct reenc_ctx *rc)
757 size_t block_size = opt_bsize * 1024 * 1024;
758 int fd_old = -1, fd_new = -1;
763 log_dbg("Data copy preparation.");
765 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
767 log_err(_("Cannot open temporary LUKS header file.\n"));
771 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
773 log_err(_("Cannot open temporary LUKS header file.\n"));
778 if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size_real) < 0) {
779 log_err(_("Cannot get device size.\n"));
783 rc->device_size = opt_device_size ?: rc->device_size_real;
785 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
786 log_err(_("Allocation of aligned memory failed.\n"));
792 gettimeofday(&rc->start_time, NULL);
794 if (rc->reencrypt_direction == FORWARD)
795 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
797 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
800 print_progress(rc, bytes, 1);
803 log_err(_("Interrupted by a signal.\n"));
805 log_err(_("IO error during reencryption.\n"));
817 static int initialize_uuid(struct reenc_ctx *rc)
819 struct crypt_device *cd = NULL;
822 log_dbg("Initialising UUID.");
825 rc->device_uuid = strdup(NO_UUID);
829 /* Try to load LUKS from device */
830 if ((r = crypt_init(&cd, rc->device)))
832 crypt_set_log_callback(cd, _quiet_log, NULL);
833 r = crypt_load(cd, CRYPT_LUKS1, NULL);
835 rc->device_uuid = strdup(crypt_get_uuid(cd));
837 /* Reencryption already in progress - magic header? */
838 r = device_check(rc, CHECK_UNUSABLE);
844 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
845 const char *msg, int slot_to_check, int check)
847 int r = -EINVAL, slot, retry_count;
849 slot = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check;
851 retry_count = opt_tries ?: 1;
852 while (retry_count--) {
854 r = crypt_get_key(msg, &rc->p[slot].password,
855 &rc->p[slot].passwordLen,
856 0, 0, NULL /*opt_key_file*/,
863 /* library uses sigint internally, until it is fixed...*/
866 r = crypt_activate_by_passphrase(cd, NULL, slot_to_check,
867 rc->p[slot].password, rc->p[slot].passwordLen, 0);
872 crypt_safe_free(rc->p[slot].password);
873 rc->p[slot].password = NULL;
874 rc->p[slot].passwordLen = 0;
876 if (r < 0 && r != -EPERM)
882 log_err(_("No key available with this passphrase.\n"));
887 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
891 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
892 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
893 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
897 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
898 rc->p[slot].password, rc->p[slot].passwordLen, 0);
901 * Allow keyslot only if it is last slot or if user explicitly
902 * specify whch slot to use (IOW others will be disabled).
904 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
905 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
906 log_err(_("Key file can be used only with --key-slot or with "
907 "exactly one key slot active.\n"));
912 crypt_safe_free(rc->p[slot].password);
913 rc->p[slot].password = NULL;
914 rc->p[slot].passwordLen = 0;
916 log_err(_("No key available with this passphrase.\n"));
924 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
926 struct crypt_device *cd = NULL;
927 crypt_keyslot_info ki;
931 log_dbg("Passhrases initialization.");
933 if (opt_new && !rc->in_progress) {
934 r = init_passphrase1(rc, cd, _("Enter new passphrase: "), 0, 0);
935 return r > 0 ? 0 : r;
938 if ((r = crypt_init(&cd, device)) ||
939 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
940 (r = crypt_set_data_device(cd, rc->device))) {
946 r = init_keyfile(rc, cd, opt_key_slot);
947 } else if (rc->in_progress) {
948 r = init_passphrase1(rc, cd, _("Enter any existing passphrase: "),
950 } else for (i = 0; i < MAX_SLOT; i++) {
951 ki = crypt_keyslot_status(cd, i);
952 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
955 snprintf(msg, sizeof(msg), _("Enter passphrase for key slot %u: "), i);
956 r = init_passphrase1(rc, cd, msg, i, 1);
962 return r > 0 ? 0 : r;
965 static int initialize_context(struct reenc_ctx *rc, const char *device)
967 log_dbg("Initialising reencryption context.");
971 if (!(rc->device = strndup(device, PATH_MAX)))
974 if (device_check(rc, CHECK_OPEN) < 0)
977 if (initialize_uuid(rc)) {
978 log_err(_("Device %s is not a valid LUKS device.\n"), device);
982 /* Prepare device names */
983 if (snprintf(rc->log_file, PATH_MAX,
984 "LUKS-%s.log", rc->device_uuid) < 0)
986 if (snprintf(rc->header_file_org, PATH_MAX,
987 "LUKS-%s.org", rc->device_uuid) < 0)
989 if (snprintf(rc->header_file_new, PATH_MAX,
990 "LUKS-%s.new", rc->device_uuid) < 0)
993 /* Paths to encrypted devices */
994 if (snprintf(rc->crypt_path_org, PATH_MAX,
995 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
997 if (snprintf(rc->crypt_path_new, PATH_MAX,
998 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
1003 if (open_log(rc) < 0) {
1004 log_err(_("Cannot open reencryption log file.\n"));
1008 if (!rc->in_progress) {
1009 if (!opt_reduce_size)
1010 rc->reencrypt_direction = FORWARD;
1012 rc->reencrypt_direction = BACKWARD;
1013 rc->device_offset = (uint64_t)~0;
1020 static void destroy_context(struct reenc_ctx *rc)
1024 log_dbg("Destroying reencryption context.");
1029 if ((rc->reencrypt_direction == FORWARD &&
1030 rc->device_offset == rc->device_size) ||
1031 (rc->reencrypt_direction == BACKWARD &&
1032 (rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
1033 unlink(rc->log_file);
1034 unlink(rc->header_file_org);
1035 unlink(rc->header_file_new);
1038 for (i = 0; i < MAX_SLOT; i++)
1039 crypt_safe_free(rc->p[i].password);
1042 free(rc->device_uuid);
1045 static int run_reencrypt(const char *device)
1048 struct reenc_ctx rc = {};
1050 if (initialize_context(&rc, device))
1053 log_dbg("Running reencryption.");
1055 if (!rc.in_progress) {
1057 if ((r = initialize_passphrase(&rc, rc.device)) ||
1058 (r = backup_fake_header(&rc)))
1060 } else if ((r = initialize_passphrase(&rc, rc.device)) ||
1061 (r = backup_luks_headers(&rc)) ||
1062 (r = device_check(&rc, MAKE_UNUSABLE)))
1065 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1069 if ((r = activate_luks_headers(&rc)))
1072 if ((r = copy_data(&rc)))
1075 r = restore_luks_header(&rc);
1077 destroy_context(&rc);
1081 static void help(poptContext popt_context,
1082 enum poptCallbackReason reason __attribute__((unused)),
1083 struct poptOption *key,
1084 const char *arg __attribute__((unused)),
1085 void *data __attribute__((unused)))
1087 if (key->shortName == '?') {
1088 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1089 poptPrintHelp(popt_context, stdout, 0);
1092 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1095 int main(int argc, const char **argv)
1097 static struct poptOption popt_help_options[] = {
1098 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1099 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1100 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1103 static struct poptOption popt_options[] = {
1104 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1105 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1106 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1107 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1108 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1109 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1110 { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
1111 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1112 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1113 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1114 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1115 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1116 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1117 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1118 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1119 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1120 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1121 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1122 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1123 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1124 { "reduce-device-size",'\0', POPT_ARG_STRING, &opt_reduce_size_str, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("bytes") },
1125 { "device-size", '\0', POPT_ARG_STRING, &opt_device_size_str, 0, N_("Use only specified device size (ignore rest of device). DANGEROUS!"), N_("bytes") },
1126 { "new", 'N', POPT_ARG_NONE,&opt_new, 0, N_("Create new header on not encrypted device."), NULL },
1129 poptContext popt_context;
1132 crypt_set_log_callback(NULL, tool_log, NULL);
1136 setlocale(LC_ALL, "");
1137 bindtextdomain(PACKAGE, LOCALEDIR);
1138 textdomain(PACKAGE);
1140 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1141 poptSetOtherOptionHelp(popt_context,
1142 _("[OPTION...] <device>"));
1144 while((r = poptGetNextOpt(popt_context)) > 0) ;
1146 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1147 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1149 if (opt_version_mode) {
1150 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1151 poptFreeContext(popt_context);
1155 if (!opt_batch_mode) {
1156 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1157 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1158 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1159 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1162 action_argv = poptGetArgs(popt_context);
1164 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1165 poptGetInvocationName(popt_context));
1167 if (opt_random && opt_urandom)
1168 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1169 poptGetInvocationName(popt_context));
1171 if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
1172 opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0) {
1173 usage(popt_context, EXIT_FAILURE,
1174 _("Negative number for option not permitted."),
1175 poptGetInvocationName(popt_context));
1178 if (opt_bsize < 1 || opt_bsize > 64)
1179 usage(popt_context, EXIT_FAILURE,
1180 _("Only values between 1 MiB and 64 MiB allowed for reencryption block size."),
1181 poptGetInvocationName(popt_context));
1183 if (opt_key_size % 8)
1184 usage(popt_context, EXIT_FAILURE,
1185 _("Key size must be a multiple of 8 bits"),
1186 poptGetInvocationName(popt_context));
1188 if (opt_key_slot != CRYPT_ANY_SLOT &&
1189 (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
1190 usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
1191 poptGetInvocationName(popt_context));
1193 if (opt_random && opt_urandom)
1194 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1195 poptGetInvocationName(popt_context));
1197 if (opt_device_size_str &&
1198 crypt_string_to_size(NULL, opt_device_size_str, &opt_device_size))
1199 usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
1200 poptGetInvocationName(popt_context));
1202 if (opt_reduce_size_str &&
1203 crypt_string_to_size(NULL, opt_reduce_size_str, &opt_reduce_size))
1204 usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
1205 poptGetInvocationName(popt_context));
1206 if (opt_reduce_size > 64 * 1024 * 1024)
1207 usage(popt_context, EXIT_FAILURE, _("Maximum device reduce size is 64 MiB."),
1208 poptGetInvocationName(popt_context));
1209 if (opt_reduce_size % SECTOR_SIZE)
1210 usage(popt_context, EXIT_FAILURE, _("Reduce size must be multiple of 512 bytes sector."),
1211 poptGetInvocationName(popt_context));
1213 if (opt_new && !opt_reduce_size)
1214 usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce-device-size."),
1215 poptGetInvocationName(popt_context));
1219 crypt_set_debug_level(-1);
1220 dbg_version_and_cmd(argc, argv);
1223 r = run_reencrypt(action_argv[0]);
1225 poptFreeContext(popt_context);
1227 return translate_errno(r);