2 * crypt_reencrypt - crypt utility for offline reencryption
4 * Copyright (C) 2012 Milan Broz All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #define PACKAGE_REENC "crypt_reencrypt"
22 #define _LARGEFILE64_SOURCE
23 #define _FILE_OFFSET_BITS 64
24 #define SECTOR_SIZE 512
35 #include <sys/ioctl.h>
42 #include "cryptsetup.h"
44 static int opt_verbose = 0;
45 static int opt_debug = 0;
46 static const char *opt_cipher = NULL;
47 static const char *opt_hash = NULL;
48 static const char *opt_key_file = NULL;
49 static long opt_keyfile_size = 0;
50 static long opt_keyfile_offset = 0;
51 static int opt_iteration_time = 1000;
52 static int opt_batch_mode = 0;
53 static int opt_version_mode = 0;
54 static int opt_random = 0;
55 static int opt_urandom = 0;
56 static int opt_bsize = 4;
57 static int opt_directio = 0;
58 static int opt_fsync = 0;
59 static int opt_write_log = 0;
60 static int opt_tries = 3;
61 static int opt_key_slot = CRYPT_ANY_SLOT;
63 static const char **action_argv;
65 static volatile int quit = 0;
72 uint64_t device_offset;
73 uint64_t device_shift;
76 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
78 char header_file_org[PATH_MAX];
79 char header_file_new[PATH_MAX];
80 char log_file[PATH_MAX];
82 char crypt_path_org[PATH_MAX];
83 char crypt_path_new[PATH_MAX];
93 struct timeval start_time, end_time;
94 uint64_t restart_bytes;
97 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
98 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
108 __attribute__((format(printf, 5, 6)))
109 static void clogger(struct crypt_device *cd, int level, const char *file,
110 int line, const char *format, ...)
115 va_start(argp, format);
117 if (vasprintf(&target, format, argp) > 0) {
119 crypt_log(cd, level, target);
120 } else if (opt_debug)
121 printf("# %s\n", target);
128 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
132 case CRYPT_LOG_NORMAL:
135 case CRYPT_LOG_VERBOSE:
139 case CRYPT_LOG_ERROR:
142 case CRYPT_LOG_DEBUG:
144 printf("# %s\n", msg);
147 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
152 static void _quiet_log(int level, const char *msg, void *usrptr)
156 _log(level, msg, usrptr);
159 static void int_handler(int sig __attribute__((__unused__)))
164 static void set_int_block(int block)
166 sigset_t signals_open;
168 sigemptyset(&signals_open);
169 sigaddset(&signals_open, SIGINT);
170 sigaddset(&signals_open, SIGTERM);
171 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
174 static void set_int_handler(void)
176 struct sigaction sigaction_open;
178 memset(&sigaction_open, 0, sizeof(struct sigaction));
179 sigaction_open.sa_handler = int_handler;
180 sigaction(SIGINT, &sigaction_open, 0);
181 sigaction(SIGTERM, &sigaction_open, 0);
185 /* The difference in seconds between two times in "timeval" format. */
186 static double time_diff(struct timeval start, struct timeval end)
188 return (end.tv_sec - start.tv_sec)
189 + (end.tv_usec - start.tv_usec) / 1E6;
192 static int alignment(int fd)
196 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
202 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
208 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
210 if (errno == EBUSY) {
211 log_err(_("Cannot exclusively open %s, device in use.\n"),
215 log_err(_("Cannot open device %s\n"), rc->device);
219 if (set_magic == CHECK_OPEN) {
224 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
225 log_err(_("Allocation of aligned memory failed.\n"));
230 s = read(devfd, buf, SECTOR_SIZE);
231 if (s < 0 || s != SECTOR_SIZE) {
232 log_err(_("Cannot read device %s.\n"), rc->device);
237 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L)) {
238 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
239 memcpy(buf, NOMAGIC, MAGIC_L);
242 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L)) {
243 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
244 memcpy(buf, MAGIC, MAGIC_L);
246 } else if (set_magic == CHECK_UNUSABLE) {
247 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
249 rc->device_uuid = strndup(&buf[0xa8], 40);
255 if (lseek(devfd, 0, SEEK_SET) == -1)
257 s = write(devfd, buf, SECTOR_SIZE);
258 if (s < 0 || s != SECTOR_SIZE) {
259 log_err(_("Cannot write device %s.\n"), rc->device);
263 log_dbg("LUKS signature check failed for %s.", rc->device);
266 memset(buf, 0, SECTOR_SIZE);
272 static int create_empty_header(const char *new_file, const char *old_file)
279 if (stat(old_file, &st) == -1 ||
280 (st.st_mode & S_IFMT) != S_IFREG ||
281 (st.st_size > 16 * 1024 * 1024))
285 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
287 if (!(buf = malloc(size)))
289 memset(buf, 0, size);
291 fd = creat(new_file, S_IRUSR|S_IWUSR);
297 if (write(fd, buf, size) < size)
305 static int write_log(struct reenc_ctx *rc)
309 memset(rc->log_buf, 0, SECTOR_SIZE);
310 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
311 "version = %d\nUUID = %s\ndirection = %d\n"
312 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
313 1, rc->device_uuid, rc->reencrypt_direction,
314 rc->device_offset, rc->device_shift);
316 lseek(rc->log_fd, 0, SEEK_SET);
317 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
318 if (r < 0 || r != SECTOR_SIZE) {
319 log_err(_("Cannot write reencryption log file.\n"));
326 static int parse_line_log(struct reenc_ctx *rc, const char *line)
332 /* whole line is comment */
336 if (sscanf(line, "version = %d", &i) == 1) {
338 log_dbg("Log: Unexpected version = %i", i);
341 } else if (sscanf(line, "UUID = %40s", s) == 1) {
342 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
343 log_dbg("Log: Unexpected UUID %s", s);
346 } else if (sscanf(line, "direction = %d", &i) == 1) {
347 log_dbg("Log: direction = %i", i);
348 rc->reencrypt_direction = i;
349 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
350 log_dbg("Log: offset = %" PRIu64, u64);
351 rc->device_offset = u64;
352 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
353 log_dbg("Log: shift = %" PRIu64, u64);
354 rc->device_shift = u64;
361 static int parse_log(struct reenc_ctx *rc)
366 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
368 log_err(_("Cannot read reencryption log file.\n"));
372 rc->log_buf[SECTOR_SIZE - 1] = '\0';
375 end = strchr(start, '\n');
378 if (parse_line_log(rc, start)) {
379 log_err("Wrong log format.\n");
390 static void close_log(struct reenc_ctx *rc)
392 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
393 if (rc->log_fd != -1)
399 static int open_log(struct reenc_ctx *rc)
401 int flags, create_new;
404 if (!stat(rc->log_file, &st))
406 else if (errno == ENOENT)
412 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
413 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
414 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
415 if (rc->log_fd == -1)
418 log_dbg("Log file %s exists, restarting.", rc->log_file);
419 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
420 rc->log_fd = open(rc->log_file, flags);
421 if (rc->log_fd == -1)
426 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
427 log_err(_("Allocation of aligned memory failed.\n"));
432 if (create_new && write_log(rc) < 0) {
437 /* Be sure it is correct format */
438 return parse_log(rc);
441 static int activate_luks_headers(struct reenc_ctx *rc)
443 struct crypt_device *cd = NULL, *cd_new = NULL;
446 log_dbg("Activating LUKS devices from headers.");
448 if ((r = crypt_init(&cd, rc->header_file_org)) ||
449 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
450 (r = crypt_set_data_device(cd, rc->device)))
453 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
454 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
455 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
458 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
459 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
460 (r = crypt_set_data_device(cd_new, rc->device)))
463 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
464 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
465 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
472 log_err(_("Activation of temporary devices failed.\n"));
476 static int backup_luks_headers(struct reenc_ctx *rc)
478 struct crypt_device *cd = NULL, *cd_new = NULL;
479 struct crypt_params_luks1 params = {0};
480 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
483 log_dbg("Creating LUKS header backup for device %s.", rc->device);
485 if ((r = crypt_init(&cd, rc->device)) ||
486 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
489 crypt_set_confirm_callback(cd, NULL, NULL);
490 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
492 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
494 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org)))
497 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
498 params.data_alignment = crypt_get_data_offset(cd);
499 params.data_device = rc->device;
501 if ((r = crypt_init(&cd_new, rc->header_file_new)))
505 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
506 else if (opt_urandom)
507 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
509 if (opt_iteration_time)
510 crypt_set_iteration_time(cd_new, opt_iteration_time);
513 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
515 log_err(_("No known cipher specification pattern detected.\n"));
520 if ((r = crypt_format(cd_new, CRYPT_LUKS1,
521 opt_cipher ? cipher : crypt_get_cipher(cd),
522 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
524 NULL, crypt_get_volume_key_size(cd), ¶ms)))
526 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
528 for (i = 0; i < MAX_SLOT; i++) {
529 if (!rc->p[i].password)
531 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
532 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
534 log_verbose(_("Activated keyslot %i.\n"), r);
541 log_err(_("Creation of LUKS backup headers failed.\n"));
545 static void remove_headers(struct reenc_ctx *rc)
547 struct crypt_device *cd = NULL;
549 log_dbg("Removing headers.");
551 if (crypt_init(&cd, NULL))
553 crypt_set_log_callback(cd, _quiet_log, NULL);
554 (void)crypt_deactivate(cd, rc->header_file_org);
555 (void)crypt_deactivate(cd, rc->header_file_new);
559 static int restore_luks_header(struct reenc_ctx *rc)
561 struct crypt_device *cd = NULL;
564 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
566 r = crypt_init(&cd, rc->device);
568 crypt_set_confirm_callback(cd, NULL, NULL);
569 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
574 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
576 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
580 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
582 unsigned long long mbytes, eta;
583 struct timeval now_time;
586 gettimeofday(&now_time, NULL);
587 if (!final && time_diff(rc->end_time, now_time) < 0.5)
590 rc->end_time = now_time;
595 tdiff = time_diff(rc->start_time, rc->end_time);
599 mbytes = (bytes - rc->restart_bytes) / 1024 / 1024;
600 mib = (double)(mbytes) / tdiff;
604 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
606 /* vt100 code clear line */
608 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
609 "%4llu MiB written, speed %5.1f MiB/s%s"),
610 (double)bytes / rc->device_size * 100,
611 eta / 60, eta % 60, mbytes, mib,
615 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
616 size_t block_size, void *buf, uint64_t *bytes)
620 log_dbg("Reencrypting in forward direction.");
622 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
623 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
624 log_err(_("Cannot seek to device offset.\n"));
628 rc->restart_bytes = *bytes = rc->device_offset;
630 if (write_log(rc) < 0)
633 while (!quit && rc->device_offset < rc->device_size) {
634 s1 = read(fd_old, buf, block_size);
635 if (s1 < 0 || ((size_t)s1 != block_size &&
636 (rc->device_offset + s1) != rc->device_size)) {
637 log_dbg("Read error, expecting %d, got %d.",
638 (int)block_size, (int)s1);
642 s2 = write(fd_new, buf, s1);
644 log_dbg("Write error, expecting %d, got %d.",
645 (int)block_size, (int)s2);
649 rc->device_offset += s1;
650 if (opt_write_log && write_log(rc) < 0)
653 if (opt_fsync && fsync(fd_new) < 0) {
654 log_dbg("Write error, fsync.");
658 *bytes += (uint64_t)s2;
659 print_progress(rc, *bytes, 0);
662 return quit ? -EAGAIN : 0;
665 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
666 size_t block_size, void *buf, uint64_t *bytes)
668 ssize_t s1, s2, working_block;
669 off64_t working_offset;
671 log_dbg("Reencrypting in backward direction.");
673 if (!rc->in_progress) {
674 rc->device_offset = rc->device_size;
675 rc->restart_bytes = 0;
678 rc->restart_bytes = rc->device_size - rc->device_offset;
679 *bytes = rc->restart_bytes;
682 if (write_log(rc) < 0)
685 while (!quit && rc->device_offset) {
686 if (rc->device_offset < block_size) {
688 working_block = rc->device_offset;
690 working_offset = rc->device_offset - block_size;
691 working_block = block_size;
694 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
695 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
696 log_err(_("Cannot seek to device offset.\n"));
700 s1 = read(fd_old, buf, working_block);
701 if (s1 < 0 || (s1 != working_block)) {
702 log_dbg("Read error, expecting %d, got %d.",
703 (int)block_size, (int)s1);
707 s2 = write(fd_new, buf, working_block);
709 log_dbg("Write error, expecting %d, got %d.",
710 (int)block_size, (int)s2);
714 rc->device_offset -= s1;
715 if (opt_write_log && write_log(rc) < 0)
718 if (opt_fsync && fsync(fd_new) < 0) {
719 log_dbg("Write error, fsync.");
723 *bytes += (uint64_t)s2;
724 print_progress(rc, *bytes, 0);
727 return quit ? -EAGAIN : 0;
730 static int copy_data(struct reenc_ctx *rc)
732 size_t block_size = opt_bsize * 1024 * 1024;
733 int fd_old = -1, fd_new = -1;
738 log_dbg("Data copy preparation.");
740 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
742 log_err(_("Cannot open temporary LUKS header file.\n"));
746 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
748 log_err(_("Cannot open temporary LUKS header file.\n"));
753 if (ioctl(fd_old, BLKGETSIZE64, &rc->device_size) < 0) {
754 log_err(_("Cannot get device size.\n"));
758 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
759 log_err(_("Allocation of aligned memory failed.\n"));
765 gettimeofday(&rc->start_time, NULL);
767 if (rc->reencrypt_direction == FORWARD)
768 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
770 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
773 print_progress(rc, bytes, 1);
776 log_err(_("Interrupted by a signal.\n"));
778 log_err(_("IO error during reencryption.\n"));
790 static int initialize_uuid(struct reenc_ctx *rc)
792 struct crypt_device *cd = NULL;
795 log_dbg("Initialising UUID.");
797 /* Try to load LUKS from device */
798 if ((r = crypt_init(&cd, rc->device)))
800 crypt_set_log_callback(cd, _quiet_log, NULL);
801 r = crypt_load(cd, CRYPT_LUKS1, NULL);
803 rc->device_uuid = strdup(crypt_get_uuid(cd));
805 /* Reencryption already in progress - magic header? */
806 r = device_check(rc, CHECK_UNUSABLE);
812 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
813 const char *msg, int slot_check)
815 int r = -EINVAL, slot, retry_count;
817 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
819 retry_count = opt_tries ?: 1;
820 while (retry_count--) {
822 r = crypt_get_key(msg, &rc->p[slot].password,
823 &rc->p[slot].passwordLen,
824 0, 0, NULL /*opt_key_file*/,
831 /* library uses sigint internally, until it is fixed...*/
833 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
834 rc->p[slot].password, rc->p[slot].passwordLen, 0);
837 crypt_safe_free(rc->p[slot].password);
838 rc->p[slot].password = NULL;
839 rc->p[slot].passwordLen = 0;
841 if (r < 0 && r != -EPERM)
847 log_err(_("No key available with this passphrase.\n"));
852 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
856 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
857 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
858 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
862 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
863 rc->p[slot].password, rc->p[slot].passwordLen, 0);
866 * Allow keyslot only if it is last slot or if user explicitly
867 * specify whch slot to use (IOW others will be disabled).
869 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
870 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
871 log_err(_("Key file can be used only with --key-slot or with "
872 "exactly one key slot active.\n"));
877 crypt_safe_free(rc->p[slot].password);
878 rc->p[slot].password = NULL;
879 rc->p[slot].passwordLen = 0;
881 log_err(_("No key available with this passphrase.\n"));
889 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
891 struct crypt_device *cd = NULL;
892 crypt_keyslot_info ki;
896 log_dbg("Passhrases initialization.");
898 if ((r = crypt_init(&cd, device)) ||
899 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
900 (r = crypt_set_data_device(cd, rc->device))) {
906 r = init_keyfile(rc, cd, opt_key_slot);
907 } else if (rc->in_progress) {
908 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "), CRYPT_ANY_SLOT);
909 } else for (i = 0; i < MAX_SLOT; i++) {
910 ki = crypt_keyslot_status(cd, i);
911 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
914 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
915 r = init_passphrase1(rc, cd, msg, i);
921 return r > 0 ? 0 : r;
924 static int initialize_context(struct reenc_ctx *rc, const char *device)
926 log_dbg("Initialising reencryption context.");
930 if (!(rc->device = strndup(device, PATH_MAX)))
933 if (device_check(rc, CHECK_OPEN) < 0)
936 if (initialize_uuid(rc)) {
937 log_err(_("Device %s is not a valid LUKS device.\n"), device);
941 /* Prepare device names */
942 if (snprintf(rc->log_file, PATH_MAX,
943 "LUKS-%s.log", rc->device_uuid) < 0)
945 if (snprintf(rc->header_file_org, PATH_MAX,
946 "LUKS-%s.org", rc->device_uuid) < 0)
948 if (snprintf(rc->header_file_new, PATH_MAX,
949 "LUKS-%s.new", rc->device_uuid) < 0)
952 /* Paths to encrypted devices */
953 if (snprintf(rc->crypt_path_org, PATH_MAX,
954 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
956 if (snprintf(rc->crypt_path_new, PATH_MAX,
957 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
962 if (open_log(rc) < 0) {
963 log_err(_("Cannot open reencryption log file.\n"));
967 if (!rc->in_progress) {
969 rc->reencrypt_direction = FORWARD;
971 rc->reencrypt_direction = BACKWARD;
972 rc->device_offset = (uint64_t)~0;
979 static void destroy_context(struct reenc_ctx *rc)
983 log_dbg("Destroying reencryption context.");
988 if ((rc->reencrypt_direction == FORWARD &&
989 rc->device_offset == rc->device_size) ||
990 (rc->reencrypt_direction == BACKWARD &&
991 rc->device_offset == 0)) {
992 unlink(rc->log_file);
993 unlink(rc->header_file_org);
994 unlink(rc->header_file_new);
997 for (i = 0; i < MAX_SLOT; i++)
998 crypt_safe_free(rc->p[i].password);
1001 free(rc->device_uuid);
1004 static int run_reencrypt(const char *device)
1007 struct reenc_ctx rc = {};
1009 if (initialize_context(&rc, device))
1012 log_dbg("Running reencryption.");
1014 if (!rc.in_progress) {
1015 if ((r = initialize_passphrase(&rc, rc.device)) ||
1016 (r = backup_luks_headers(&rc)) ||
1017 (r = device_check(&rc, MAKE_UNUSABLE)))
1020 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1024 if ((r = activate_luks_headers(&rc)))
1027 if ((r = copy_data(&rc)))
1030 r = restore_luks_header(&rc);
1032 destroy_context(&rc);
1036 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
1037 int exitcode, const char *error,
1040 poptPrintUsage(popt_context, stderr, 0);
1042 log_err("%s: %s\n", more, error);
1043 poptFreeContext(popt_context);
1047 static void help(poptContext popt_context,
1048 enum poptCallbackReason reason __attribute__((unused)),
1049 struct poptOption *key,
1050 const char *arg __attribute__((unused)),
1051 void *data __attribute__((unused)))
1053 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1056 static void _dbg_version_and_cmd(int argc, const char **argv)
1060 log_std("# %s %s processing \"", PACKAGE_REENC, PACKAGE_VERSION);
1061 for (i = 0; i < argc; i++) {
1064 log_std("%s", argv[i]);
1069 int main(int argc, const char **argv)
1071 static struct poptOption popt_help_options[] = {
1072 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1073 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1074 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1077 static struct poptOption popt_options[] = {
1078 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1079 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1080 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1081 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1082 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1083 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1084 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1085 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1086 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1087 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1088 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1089 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1090 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1091 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1092 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1093 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1094 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1095 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1096 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1099 poptContext popt_context;
1102 crypt_set_log_callback(NULL, _log, NULL);
1106 setlocale(LC_ALL, "");
1107 bindtextdomain(PACKAGE, LOCALEDIR);
1108 textdomain(PACKAGE);
1110 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1111 poptSetOtherOptionHelp(popt_context,
1112 N_("[OPTION...] <device>]"));
1114 while((r = poptGetNextOpt(popt_context)) > 0) ;
1116 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1117 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1119 if (opt_version_mode) {
1120 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1121 poptFreeContext(popt_context);
1125 if (!opt_batch_mode) {
1126 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1127 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1128 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1129 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1132 action_argv = poptGetArgs(popt_context);
1134 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1135 poptGetInvocationName(popt_context));
1137 if (opt_random && opt_urandom)
1138 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1139 poptGetInvocationName(popt_context));
1141 if (opt_bsize < 1 || opt_bsize > 64)
1142 usage(popt_context, EXIT_FAILURE,
1143 _("Only values between 1MiB and 64 MiB allowed for reencryption block size."),
1144 poptGetInvocationName(popt_context));
1148 crypt_set_debug_level(-1);
1149 _dbg_version_and_cmd(argc, argv);
1152 r = run_reencrypt(action_argv[0]);
1154 poptFreeContext(popt_context);
1156 /* Translate exit code to simple codes */
1158 case 0: r = EXIT_SUCCESS; break;
1160 case -EBUSY: r = 5; break;
1162 case -ENODEV: r = 4; break;
1163 case -ENOMEM: r = 3; break;
1164 case -EPERM: r = 2; break;
1165 default: r = EXIT_FAILURE;