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};
107 __attribute__((format(printf, 5, 6)))
108 static void clogger(struct crypt_device *cd, int level, const char *file,
109 int line, const char *format, ...)
114 va_start(argp, format);
116 if (vasprintf(&target, format, argp) > 0) {
118 crypt_log(cd, level, target);
119 } else if (opt_debug)
120 printf("# %s\n", target);
127 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
131 case CRYPT_LOG_NORMAL:
134 case CRYPT_LOG_VERBOSE:
138 case CRYPT_LOG_ERROR:
141 case CRYPT_LOG_DEBUG:
143 printf("# %s\n", msg);
146 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
151 static void _quiet_log(int level, const char *msg, void *usrptr)
153 if (!opt_verbose && (level == CRYPT_LOG_ERROR || level == CRYPT_LOG_NORMAL))
154 level = CRYPT_LOG_VERBOSE;
155 _log(level, msg, usrptr);
158 static void int_handler(int sig __attribute__((__unused__)))
163 static void set_int_block(int block)
165 sigset_t signals_open;
167 sigemptyset(&signals_open);
168 sigaddset(&signals_open, SIGINT);
169 sigaddset(&signals_open, SIGTERM);
170 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
173 static void set_int_handler(void)
175 struct sigaction sigaction_open;
177 memset(&sigaction_open, 0, sizeof(struct sigaction));
178 sigaction_open.sa_handler = int_handler;
179 sigaction(SIGINT, &sigaction_open, 0);
180 sigaction(SIGTERM, &sigaction_open, 0);
184 /* The difference in seconds between two times in "timeval" format. */
185 static double time_diff(struct timeval start, struct timeval end)
187 return (end.tv_sec - start.tv_sec)
188 + (end.tv_usec - start.tv_usec) / 1E6;
191 static int alignment(int fd)
195 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
201 static int device_magic(struct reenc_ctx *rc, header_magic set_magic)
207 devfd = open(rc->device, O_RDWR | O_DIRECT);
209 return errno == EBUSY ? -EBUSY : -EINVAL;
211 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
212 log_err(_("Allocation of aligned memory failed.\n"));
217 s = read(devfd, buf, SECTOR_SIZE);
218 if (s < 0 || s != SECTOR_SIZE) {
219 log_err(_("Cannot read device %s.\n"), rc->device);
224 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L)) {
225 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
226 memcpy(buf, NOMAGIC, MAGIC_L);
229 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L)) {
230 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
231 memcpy(buf, MAGIC, MAGIC_L);
233 } else if (set_magic == CHECK_UNUSABLE) {
234 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
236 rc->device_uuid = strndup(&buf[0xa8], 40);
242 if (lseek(devfd, 0, SEEK_SET) == -1)
244 s = write(devfd, buf, SECTOR_SIZE);
245 if (s < 0 || s != SECTOR_SIZE) {
246 log_err(_("Cannot write device %s.\n"), rc->device);
250 log_dbg("LUKS signature check failed for %s.", rc->device);
253 memset(buf, 0, SECTOR_SIZE);
259 static int create_empty_header(const char *new_file, const char *old_file)
266 if (stat(old_file, &st) == -1 ||
267 (st.st_mode & S_IFMT) != S_IFREG ||
268 (st.st_size > 16 * 1024 * 1024))
272 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
274 if (!(buf = malloc(size)))
276 memset(buf, 0, size);
278 fd = creat(new_file, S_IRUSR|S_IWUSR);
284 if (write(fd, buf, size) < size)
292 static int write_log(struct reenc_ctx *rc)
296 memset(rc->log_buf, 0, SECTOR_SIZE);
297 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
298 "version = %d\nUUID = %s\ndirection = %d\n"
299 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
300 1, rc->device_uuid, rc->reencrypt_direction,
301 rc->device_offset, rc->device_shift);
303 lseek(rc->log_fd, 0, SEEK_SET);
304 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
305 if (r < 0 || r != SECTOR_SIZE) {
306 log_err(_("Cannot write reencryption log file.\n"));
313 static int parse_line_log(struct reenc_ctx *rc, const char *line)
319 /* whole line is comment */
323 if (sscanf(line, "version = %d", &i) == 1) {
325 log_dbg("Log: Unexpected version = %i", i);
328 } else if (sscanf(line, "UUID = %40s", s) == 1) {
329 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
330 log_dbg("Log: Unexpected UUID %s", s);
333 } else if (sscanf(line, "direction = %d", &i) == 1) {
334 log_dbg("Log: direction = %i", i);
335 rc->reencrypt_direction = i;
336 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
337 log_dbg("Log: offset = %" PRIu64, u64);
338 rc->device_offset = u64;
339 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
340 log_dbg("Log: shift = %" PRIu64, u64);
341 rc->device_shift = u64;
348 static int parse_log(struct reenc_ctx *rc)
353 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
355 log_err(_("Cannot read reencryption log file.\n"));
359 rc->log_buf[SECTOR_SIZE - 1] = '\0';
362 end = strchr(start, '\n');
365 if (parse_line_log(rc, start)) {
366 log_err("Wrong log format.\n");
377 static void close_log(struct reenc_ctx *rc)
379 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
380 if (rc->log_fd != -1)
386 static int open_log(struct reenc_ctx *rc)
388 int flags, create_new;
391 if (!stat(rc->log_file, &st))
393 else if (errno == ENOENT)
399 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
400 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
401 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
402 if (rc->log_fd == -1)
405 log_dbg("Log file %s exists, restarting.", rc->log_file);
406 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
407 rc->log_fd = open(rc->log_file, flags);
408 if (rc->log_fd == -1)
413 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
414 log_err(_("Allocation of aligned memory failed.\n"));
419 if (create_new && write_log(rc) < 0) {
424 /* Be sure it is correct format */
425 return parse_log(rc);
428 static int activate_luks_headers(struct reenc_ctx *rc)
430 struct crypt_device *cd = NULL, *cd_new = NULL;
433 log_dbg("Activating LUKS devices from headers.");
435 if ((r = crypt_init(&cd, rc->header_file_org)) ||
436 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
437 (r = crypt_set_data_device(cd, rc->device)))
440 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
441 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
442 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
445 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
446 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
447 (r = crypt_set_data_device(cd_new, rc->device)))
450 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
451 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
452 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
459 log_err(_("Activation of temporary devices failed.\n"));
463 static int backup_luks_headers(struct reenc_ctx *rc)
465 struct crypt_device *cd = NULL, *cd_new = NULL;
466 struct crypt_params_luks1 params = {0};
467 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
470 log_dbg("Creating LUKS header backup for device %s.", rc->device);
472 if ((r = crypt_init(&cd, rc->device)) ||
473 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
476 crypt_set_confirm_callback(cd, NULL, NULL);
477 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
479 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
481 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org)))
484 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
485 params.data_alignment = crypt_get_data_offset(cd);
486 params.data_device = rc->device;
488 if ((r = crypt_init(&cd_new, rc->header_file_new)))
492 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
493 else if (opt_urandom)
494 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
496 if (opt_iteration_time)
497 crypt_set_iteration_time(cd_new, opt_iteration_time);
500 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
502 log_err(_("No known cipher specification pattern detected.\n"));
507 if ((r = crypt_format(cd_new, CRYPT_LUKS1,
508 opt_cipher ? cipher : crypt_get_cipher(cd),
509 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
511 NULL, crypt_get_volume_key_size(cd), ¶ms)))
513 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
515 for (i = 0; i < MAX_SLOT; i++) {
516 if (!rc->p[i].password)
518 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
519 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
521 log_verbose(_("Activated keyslot %i.\n"), r);
528 log_err(_("Creation of LUKS backup headers failed.\n"));
532 static void remove_headers(struct reenc_ctx *rc)
534 struct crypt_device *cd = NULL;
536 log_dbg("Removing headers.");
538 if (crypt_init(&cd, NULL))
540 crypt_set_log_callback(cd, _quiet_log, NULL);
541 (void)crypt_deactivate(cd, rc->header_file_org);
542 (void)crypt_deactivate(cd, rc->header_file_new);
546 static int restore_luks_header(struct reenc_ctx *rc)
548 struct crypt_device *cd = NULL;
551 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
553 r = crypt_init(&cd, rc->device);
555 crypt_set_confirm_callback(cd, NULL, NULL);
556 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
561 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
563 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
567 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
569 unsigned long long mbytes, eta;
570 struct timeval now_time;
573 gettimeofday(&now_time, NULL);
574 if (!final && time_diff(rc->end_time, now_time) < 0.5)
577 rc->end_time = now_time;
582 tdiff = time_diff(rc->start_time, rc->end_time);
586 mbytes = (bytes - rc->restart_bytes) / 1024 / 1024;
587 mib = (double)(mbytes) / tdiff;
591 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
593 /* vt100 code clear line */
595 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
596 "%4llu MiB written, speed %5.1f MiB/s%s"),
597 (double)bytes / rc->device_size * 100,
598 eta / 60, eta % 60, mbytes, mib,
602 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
603 size_t block_size, void *buf, uint64_t *bytes)
607 log_dbg("Reencrypting in forward direction.");
609 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
610 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
611 log_err(_("Cannot seek to device offset.\n"));
615 rc->restart_bytes = *bytes = rc->device_offset;
617 if (write_log(rc) < 0)
620 while (!quit && rc->device_offset < rc->device_size) {
621 s1 = read(fd_old, buf, block_size);
622 if (s1 < 0 || ((size_t)s1 != block_size &&
623 (rc->device_offset + s1) != rc->device_size)) {
624 log_dbg("Read error, expecting %d, got %d.",
625 (int)block_size, (int)s1);
629 s2 = write(fd_new, buf, s1);
631 log_dbg("Write error, expecting %d, got %d.",
632 (int)block_size, (int)s2);
636 rc->device_offset += s1;
637 if (opt_write_log && write_log(rc) < 0)
640 if (opt_fsync && fsync(fd_new) < 0) {
641 log_dbg("Write error, fsync.");
645 *bytes += (uint64_t)s2;
646 print_progress(rc, *bytes, 0);
649 return quit ? -EAGAIN : 0;
652 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
653 size_t block_size, void *buf, uint64_t *bytes)
655 ssize_t s1, s2, working_block;
656 off64_t working_offset;
658 log_dbg("Reencrypting in backward direction.");
660 if (!rc->in_progress) {
661 rc->device_offset = rc->device_size;
662 rc->restart_bytes = 0;
665 rc->restart_bytes = rc->device_size - rc->device_offset;
666 *bytes = rc->restart_bytes;
669 if (write_log(rc) < 0)
672 while (!quit && rc->device_offset) {
673 if (rc->device_offset < block_size) {
675 working_block = rc->device_offset;
677 working_offset = rc->device_offset - block_size;
678 working_block = block_size;
681 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
682 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
683 log_err(_("Cannot seek to device offset.\n"));
687 s1 = read(fd_old, buf, working_block);
688 if (s1 < 0 || (s1 != working_block)) {
689 log_dbg("Read error, expecting %d, got %d.",
690 (int)block_size, (int)s1);
694 s2 = write(fd_new, buf, working_block);
696 log_dbg("Write error, expecting %d, got %d.",
697 (int)block_size, (int)s2);
701 rc->device_offset -= s1;
702 if (opt_write_log && write_log(rc) < 0)
705 if (opt_fsync && fsync(fd_new) < 0) {
706 log_dbg("Write error, fsync.");
710 *bytes += (uint64_t)s2;
711 print_progress(rc, *bytes, 0);
714 return quit ? -EAGAIN : 0;
717 static int copy_data(struct reenc_ctx *rc)
719 size_t block_size = opt_bsize * 1024 * 1024;
720 int fd_old = -1, fd_new = -1;
725 log_dbg("Data copy preparation.");
727 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
729 log_err(_("Cannot open temporary LUKS header file.\n"));
733 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
735 log_err(_("Cannot open temporary LUKS header file.\n"));
740 if (ioctl(fd_old, BLKGETSIZE64, &rc->device_size) < 0) {
741 log_err(_("Cannot get device size.\n"));
745 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
746 log_err(_("Allocation of aligned memory failed.\n"));
752 gettimeofday(&rc->start_time, NULL);
754 if (rc->reencrypt_direction == FORWARD)
755 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
757 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
760 print_progress(rc, bytes, 1);
763 log_err(_("Interrupted by a signal.\n"));
765 log_err(_("IO error during reencryption.\n"));
777 static int initialize_uuid(struct reenc_ctx *rc)
779 struct crypt_device *cd = NULL;
782 log_dbg("Initialising UUID.");
784 /* Try to load LUKS from device */
785 if ((r = crypt_init(&cd, rc->device)))
787 crypt_set_log_callback(cd, _quiet_log, NULL);
788 r = crypt_load(cd, CRYPT_LUKS1, NULL);
790 rc->device_uuid = strdup(crypt_get_uuid(cd));
792 /* Reencryption already in progress - magic header? */
793 r = device_magic(rc, CHECK_UNUSABLE);
799 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
800 const char *msg, int slot_check)
802 int r = -EINVAL, slot, retry_count;
804 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
806 retry_count = opt_tries ?: 1;
807 while (retry_count--) {
809 r = crypt_get_key(msg, &rc->p[slot].password,
810 &rc->p[slot].passwordLen,
811 0, 0, NULL /*opt_key_file*/,
818 /* library uses sigint internally, until it is fixed...*/
820 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
821 rc->p[slot].password, rc->p[slot].passwordLen, 0);
824 crypt_safe_free(rc->p[slot].password);
825 rc->p[slot].password = NULL;
826 rc->p[slot].passwordLen = 0;
828 if (r < 0 && r != -EPERM)
834 log_err(_("No key available with this passphrase.\n"));
839 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
843 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
844 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
845 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
849 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
850 rc->p[slot].password, rc->p[slot].passwordLen, 0);
853 * Allow keyslot only if it is last slot or if user explicitly
854 * specify whch slot to use (IOW others will be disabled).
856 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
857 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
858 log_err(_("Key file can be used only with --key-slot or with "
859 "exactly one key slot active.\n"));
864 crypt_safe_free(rc->p[slot].password);
865 rc->p[slot].password = NULL;
866 rc->p[slot].passwordLen = 0;
868 log_err(_("No key available with this passphrase.\n"));
876 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
878 struct crypt_device *cd = NULL;
879 crypt_keyslot_info ki;
883 log_dbg("Passhrases initialization.");
885 if ((r = crypt_init(&cd, device)) ||
886 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
887 (r = crypt_set_data_device(cd, rc->device))) {
893 r = init_keyfile(rc, cd, opt_key_slot);
894 } else if (rc->in_progress) {
895 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "), CRYPT_ANY_SLOT);
896 } else for (i = 0; i < MAX_SLOT; i++) {
897 ki = crypt_keyslot_status(cd, i);
898 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
901 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
902 r = init_passphrase1(rc, cd, msg, i);
908 return r > 0 ? 0 : r;
911 static int initialize_context(struct reenc_ctx *rc, const char *device)
913 log_dbg("Initialising reencryption context.");
917 if (!(rc->device = strndup(device, PATH_MAX)))
920 if (initialize_uuid(rc)) {
921 log_err(_("Device %s is not a valid LUKS device.\n"), device);
925 /* Prepare device names */
926 if (snprintf(rc->log_file, PATH_MAX,
927 "LUKS-%s.log", rc->device_uuid) < 0)
929 if (snprintf(rc->header_file_org, PATH_MAX,
930 "LUKS-%s.org", rc->device_uuid) < 0)
932 if (snprintf(rc->header_file_new, PATH_MAX,
933 "LUKS-%s.new", rc->device_uuid) < 0)
936 /* Paths to encrypted devices */
937 if (snprintf(rc->crypt_path_org, PATH_MAX,
938 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
940 if (snprintf(rc->crypt_path_new, PATH_MAX,
941 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
946 if (open_log(rc) < 0) {
947 log_err(_("Cannot open reencryption log file.\n"));
951 if (!rc->in_progress) {
953 rc->reencrypt_direction = FORWARD;
955 rc->reencrypt_direction = BACKWARD;
956 rc->device_offset = (uint64_t)~0;
963 static void destroy_context(struct reenc_ctx *rc)
967 log_dbg("Destroying reencryption context.");
972 if ((rc->reencrypt_direction == FORWARD &&
973 rc->device_offset == rc->device_size) ||
974 (rc->reencrypt_direction == BACKWARD &&
975 rc->device_offset == 0)) {
976 unlink(rc->log_file);
977 unlink(rc->header_file_org);
978 unlink(rc->header_file_new);
981 for (i = 0; i < MAX_SLOT; i++)
982 crypt_safe_free(rc->p[i].password);
985 free(rc->device_uuid);
988 static int run_reencrypt(const char *device)
991 struct reenc_ctx rc = {};
993 if (initialize_context(&rc, device))
996 log_dbg("Running reencryption.");
998 if (!rc.in_progress) {
999 if ((r = initialize_passphrase(&rc, rc.device)) ||
1000 (r = backup_luks_headers(&rc)) ||
1001 (r = device_magic(&rc, MAKE_UNUSABLE)))
1004 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1008 if ((r = activate_luks_headers(&rc)))
1011 if ((r = copy_data(&rc)))
1014 r = restore_luks_header(&rc);
1016 destroy_context(&rc);
1020 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
1021 int exitcode, const char *error,
1024 poptPrintUsage(popt_context, stderr, 0);
1026 log_err("%s: %s\n", more, error);
1027 poptFreeContext(popt_context);
1031 static void help(poptContext popt_context,
1032 enum poptCallbackReason reason __attribute__((unused)),
1033 struct poptOption *key,
1034 const char *arg __attribute__((unused)),
1035 void *data __attribute__((unused)))
1037 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1040 static void _dbg_version_and_cmd(int argc, const char **argv)
1044 log_std("# %s %s processing \"", PACKAGE_REENC, PACKAGE_VERSION);
1045 for (i = 0; i < argc; i++) {
1048 log_std("%s", argv[i]);
1053 int main(int argc, const char **argv)
1055 static struct poptOption popt_help_options[] = {
1056 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1057 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1058 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1061 static struct poptOption popt_options[] = {
1062 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1063 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1064 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1065 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1066 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1067 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1068 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1069 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1070 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1071 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1072 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1073 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1074 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1075 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1076 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1077 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1078 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1079 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1080 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1083 poptContext popt_context;
1086 crypt_set_log_callback(NULL, _log, NULL);
1090 setlocale(LC_ALL, "");
1091 bindtextdomain(PACKAGE, LOCALEDIR);
1092 textdomain(PACKAGE);
1094 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1095 poptSetOtherOptionHelp(popt_context,
1096 N_("[OPTION...] <device>]"));
1098 while((r = poptGetNextOpt(popt_context)) > 0) ;
1100 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1101 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1103 if (opt_version_mode) {
1104 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1105 poptFreeContext(popt_context);
1109 if (!opt_batch_mode)
1110 log_err(_("WARNING: this is experimental code, it can completely break your data.\n"));
1112 action_argv = poptGetArgs(popt_context);
1114 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1115 poptGetInvocationName(popt_context));
1117 if (opt_random && opt_urandom)
1118 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1119 poptGetInvocationName(popt_context));
1121 if (opt_bsize < 1 || opt_bsize > 64)
1122 usage(popt_context, EXIT_FAILURE,
1123 _("Only values between 1MiB and 64 MiB allowed for reencryption block size."),
1124 poptGetInvocationName(popt_context));
1128 crypt_set_debug_level(-1);
1129 _dbg_version_and_cmd(argc, argv);
1132 r = run_reencrypt(action_argv[0]);
1134 poptFreeContext(popt_context);
1136 /* Translate exit code to simple codes */
1138 case 0: r = EXIT_SUCCESS; break;
1140 case -EBUSY: r = 5; break;
1142 case -ENODEV: r = 4; break;
1143 case -ENOMEM: r = 3; break;
1144 case -EPERM: r = 2; break;
1145 default: r = EXIT_FAILURE;