2 * cryptsetup-reencrypt - crypt utility for offline re-encryption
4 * Copyright (C) 2012 Milan Broz All rights reserved.
5 * Copyright (C) 2012, Red Hat, Inc. 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 * version 2 as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #define PACKAGE_REENC "crypt_reencrypt"
23 #define _LARGEFILE64_SOURCE
24 #define _FILE_OFFSET_BITS 64
25 #define SECTOR_SIZE 512
36 #include <sys/ioctl.h>
39 #include <arpa/inet.h>
44 #include "cryptsetup.h"
46 static int opt_verbose = 0;
47 static int opt_debug = 0;
48 static const char *opt_cipher = NULL;
49 static const char *opt_hash = NULL;
50 static const char *opt_key_file = NULL;
51 static long opt_keyfile_size = 0;
52 static long opt_keyfile_offset = 0;
53 static int opt_iteration_time = 1000;
54 static int opt_batch_mode = 0;
55 static int opt_version_mode = 0;
56 static int opt_random = 0;
57 static int opt_urandom = 0;
58 static int opt_bsize = 4;
59 static int opt_reduce_device_size = 0;
60 static int opt_directio = 0;
61 static int opt_fsync = 0;
62 static int opt_write_log = 0;
63 static int opt_tries = 3;
64 static int opt_key_slot = CRYPT_ANY_SLOT;
65 static int opt_key_size = 0;
67 static const char **action_argv;
69 static volatile int quit = 0;
76 uint64_t device_offset;
77 uint64_t device_shift;
80 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
82 char header_file_org[PATH_MAX];
83 char header_file_new[PATH_MAX];
84 char log_file[PATH_MAX];
86 char crypt_path_org[PATH_MAX];
87 char crypt_path_new[PATH_MAX];
97 struct timeval start_time, end_time;
98 uint64_t restart_bytes;
101 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
102 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
112 __attribute__((format(printf, 5, 6)))
113 static void clogger(struct crypt_device *cd, int level, const char *file,
114 int line, const char *format, ...)
119 va_start(argp, format);
121 if (vasprintf(&target, format, argp) > 0) {
123 crypt_log(cd, level, target);
124 } else if (opt_debug)
125 printf("# %s\n", target);
132 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
136 case CRYPT_LOG_NORMAL:
139 case CRYPT_LOG_VERBOSE:
143 case CRYPT_LOG_ERROR:
146 case CRYPT_LOG_DEBUG:
148 printf("# %s\n", msg);
151 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
156 static void _quiet_log(int level, const char *msg, void *usrptr)
160 _log(level, msg, usrptr);
163 static void int_handler(int sig __attribute__((__unused__)))
168 static void set_int_block(int block)
170 sigset_t signals_open;
172 sigemptyset(&signals_open);
173 sigaddset(&signals_open, SIGINT);
174 sigaddset(&signals_open, SIGTERM);
175 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
178 static void set_int_handler(void)
180 struct sigaction sigaction_open;
182 memset(&sigaction_open, 0, sizeof(struct sigaction));
183 sigaction_open.sa_handler = int_handler;
184 sigaction(SIGINT, &sigaction_open, 0);
185 sigaction(SIGTERM, &sigaction_open, 0);
189 /* The difference in seconds between two times in "timeval" format. */
190 static double time_diff(struct timeval start, struct timeval end)
192 return (end.tv_sec - start.tv_sec)
193 + (end.tv_usec - start.tv_usec) / 1E6;
196 static int alignment(int fd)
200 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
206 /* Depends on the first two fields of LUKS1 header format, magic and version */
207 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
214 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
216 if (errno == EBUSY) {
217 log_err(_("Cannot exclusively open %s, device in use.\n"),
221 log_err(_("Cannot open device %s\n"), rc->device);
225 if (set_magic == CHECK_OPEN) {
230 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
231 log_err(_("Allocation of aligned memory failed.\n"));
236 s = read(devfd, buf, SECTOR_SIZE);
237 if (s < 0 || s != SECTOR_SIZE) {
238 log_err(_("Cannot read device %s.\n"), rc->device);
243 /* Be sure that we do not process new version of header */
244 memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
245 version = ntohs(version);
247 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
249 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
250 memcpy(buf, NOMAGIC, MAGIC_L);
252 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
254 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
255 memcpy(buf, MAGIC, MAGIC_L);
257 } else if (set_magic == CHECK_UNUSABLE && version == 1) {
258 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
260 rc->device_uuid = strndup(&buf[0xa8], 40);
266 if (lseek(devfd, 0, SEEK_SET) == -1)
268 s = write(devfd, buf, SECTOR_SIZE);
269 if (s < 0 || s != SECTOR_SIZE) {
270 log_err(_("Cannot write device %s.\n"), rc->device);
274 log_dbg("LUKS signature check failed for %s.", rc->device);
277 memset(buf, 0, SECTOR_SIZE);
283 static int create_empty_header(const char *new_file, const char *old_file,
284 uint64_t data_sector)
291 /* Never create header > 4MiB */
292 if (data_sector > 8192)
295 /* new header file of the same size as old backup */
296 if (stat(old_file, &st) == -1 ||
297 (st.st_mode & S_IFMT) != S_IFREG ||
298 (st.st_size > 16 * 1024 * 1024))
303 * if requesting key size change, try to use offset
304 * here can be enough space to fit new key.
307 size = data_sector * SECTOR_SIZE;
309 /* if reducing size, be sure we have enough space */
310 if (opt_reduce_device_size)
311 size += (opt_reduce_device_size * SECTOR_SIZE);
313 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
315 if (!(buf = malloc(size)))
317 memset(buf, 0, size);
319 fd = creat(new_file, S_IRUSR|S_IWUSR);
325 if (write(fd, buf, size) < size)
333 static int write_log(struct reenc_ctx *rc)
337 memset(rc->log_buf, 0, SECTOR_SIZE);
338 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
339 "version = %d\nUUID = %s\ndirection = %d\n"
340 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
341 1, rc->device_uuid, rc->reencrypt_direction,
342 rc->device_offset, rc->device_shift);
344 lseek(rc->log_fd, 0, SEEK_SET);
345 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
346 if (r < 0 || r != SECTOR_SIZE) {
347 log_err(_("Cannot write reencryption log file.\n"));
354 static int parse_line_log(struct reenc_ctx *rc, const char *line)
360 /* whole line is comment */
364 if (sscanf(line, "version = %d", &i) == 1) {
366 log_dbg("Log: Unexpected version = %i", i);
369 } else if (sscanf(line, "UUID = %40s", s) == 1) {
370 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
371 log_dbg("Log: Unexpected UUID %s", s);
374 } else if (sscanf(line, "direction = %d", &i) == 1) {
375 log_dbg("Log: direction = %i", i);
376 rc->reencrypt_direction = i;
377 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
378 log_dbg("Log: offset = %" PRIu64, u64);
379 rc->device_offset = u64;
380 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
381 log_dbg("Log: shift = %" PRIu64, u64);
382 rc->device_shift = u64;
389 static int parse_log(struct reenc_ctx *rc)
394 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
396 log_err(_("Cannot read reencryption log file.\n"));
400 rc->log_buf[SECTOR_SIZE - 1] = '\0';
403 end = strchr(start, '\n');
406 if (parse_line_log(rc, start)) {
407 log_err("Wrong log format.\n");
418 static void close_log(struct reenc_ctx *rc)
420 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
421 if (rc->log_fd != -1)
427 static int open_log(struct reenc_ctx *rc)
429 int flags, create_new;
432 if (!stat(rc->log_file, &st))
434 else if (errno == ENOENT)
440 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
441 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
442 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
443 if (rc->log_fd == -1)
446 log_std(_("Log file %s exists, restarting reencryption.\n"), rc->log_file);
447 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
448 rc->log_fd = open(rc->log_file, flags);
449 if (rc->log_fd == -1)
454 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
455 log_err(_("Allocation of aligned memory failed.\n"));
460 if (create_new && write_log(rc) < 0) {
465 /* Be sure it is correct format */
466 return parse_log(rc);
469 static int activate_luks_headers(struct reenc_ctx *rc)
471 struct crypt_device *cd = NULL, *cd_new = NULL;
474 log_dbg("Activating LUKS devices from headers.");
476 if ((r = crypt_init(&cd, rc->header_file_org)) ||
477 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
478 (r = crypt_set_data_device(cd, rc->device)))
481 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
482 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
483 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
486 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
487 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
488 (r = crypt_set_data_device(cd_new, rc->device)))
491 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
492 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
493 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
500 log_err(_("Activation of temporary devices failed.\n"));
504 static int backup_luks_headers(struct reenc_ctx *rc)
506 struct crypt_device *cd = NULL, *cd_new = NULL;
507 struct crypt_params_luks1 params = {0};
508 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
511 log_dbg("Creating LUKS header backup for device %s.", rc->device);
513 if ((r = crypt_init(&cd, rc->device)) ||
514 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
517 crypt_set_confirm_callback(cd, NULL, NULL);
518 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
520 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
522 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
523 crypt_get_data_offset(cd))))
526 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
527 params.data_alignment = crypt_get_data_offset(cd);
528 params.data_alignment += opt_reduce_device_size;
529 params.data_device = rc->device;
532 if ((r = crypt_init(&cd_new, rc->header_file_new)))
536 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
537 else if (opt_urandom)
538 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
540 if (opt_iteration_time)
541 crypt_set_iteration_time(cd_new, opt_iteration_time);
544 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
546 log_err(_("No known cipher specification pattern detected.\n"));
551 if ((r = crypt_format(cd_new, CRYPT_LUKS1,
552 opt_cipher ? cipher : crypt_get_cipher(cd),
553 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
556 opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
559 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
561 for (i = 0; i < MAX_SLOT; i++) {
562 if (!rc->p[i].password)
564 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
565 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
567 log_verbose(_("Activated keyslot %i.\n"), r);
574 log_err(_("Creation of LUKS backup headers failed.\n"));
578 static void remove_headers(struct reenc_ctx *rc)
580 struct crypt_device *cd = NULL;
582 log_dbg("Removing headers.");
584 if (crypt_init(&cd, NULL))
586 crypt_set_log_callback(cd, _quiet_log, NULL);
587 if (*rc->header_file_org)
588 (void)crypt_deactivate(cd, rc->header_file_org);
589 if (*rc->header_file_new)
590 (void)crypt_deactivate(cd, rc->header_file_new);
594 static int restore_luks_header(struct reenc_ctx *rc)
596 struct crypt_device *cd = NULL;
599 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
601 r = crypt_init(&cd, rc->device);
603 crypt_set_confirm_callback(cd, NULL, NULL);
604 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
609 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
611 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
615 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
617 unsigned long long mbytes, eta;
618 struct timeval now_time;
621 gettimeofday(&now_time, NULL);
622 if (!final && time_diff(rc->end_time, now_time) < 0.5)
625 rc->end_time = now_time;
630 tdiff = time_diff(rc->start_time, rc->end_time);
634 mbytes = (bytes - rc->restart_bytes) / 1024 / 1024;
635 mib = (double)(mbytes) / tdiff;
639 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
641 /* vt100 code clear line */
643 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
644 "%4llu MiB written, speed %5.1f MiB/s%s"),
645 (double)bytes / rc->device_size * 100,
646 eta / 60, eta % 60, mbytes, mib,
650 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
651 size_t block_size, void *buf, uint64_t *bytes)
655 log_dbg("Reencrypting in forward direction.");
657 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
658 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
659 log_err(_("Cannot seek to device offset.\n"));
663 rc->restart_bytes = *bytes = rc->device_offset;
665 if (write_log(rc) < 0)
668 while (!quit && rc->device_offset < rc->device_size) {
669 s1 = read(fd_old, buf, block_size);
670 if (s1 < 0 || ((size_t)s1 != block_size &&
671 (rc->device_offset + s1) != rc->device_size)) {
672 log_dbg("Read error, expecting %d, got %d.",
673 (int)block_size, (int)s1);
677 s2 = write(fd_new, buf, s1);
679 log_dbg("Write error, expecting %d, got %d.",
680 (int)block_size, (int)s2);
684 rc->device_offset += s1;
685 if (opt_write_log && write_log(rc) < 0)
688 if (opt_fsync && fsync(fd_new) < 0) {
689 log_dbg("Write error, fsync.");
693 *bytes += (uint64_t)s2;
694 print_progress(rc, *bytes, 0);
697 return quit ? -EAGAIN : 0;
700 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
701 size_t block_size, void *buf, uint64_t *bytes)
703 ssize_t s1, s2, working_block;
704 off64_t working_offset;
706 log_dbg("Reencrypting in backward direction.");
708 if (!rc->in_progress) {
709 rc->device_offset = rc->device_size;
710 rc->restart_bytes = 0;
713 rc->restart_bytes = rc->device_size - rc->device_offset;
714 *bytes = rc->restart_bytes;
717 if (write_log(rc) < 0)
720 while (!quit && rc->device_offset) {
721 if (rc->device_offset < block_size) {
723 working_block = rc->device_offset;
725 working_offset = rc->device_offset - block_size;
726 working_block = block_size;
729 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
730 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
731 log_err(_("Cannot seek to device offset.\n"));
735 s1 = read(fd_old, buf, working_block);
736 if (s1 < 0 || (s1 != working_block)) {
737 log_dbg("Read error, expecting %d, got %d.",
738 (int)block_size, (int)s1);
742 s2 = write(fd_new, buf, working_block);
744 log_dbg("Write error, expecting %d, got %d.",
745 (int)block_size, (int)s2);
749 rc->device_offset -= s1;
750 if (opt_write_log && write_log(rc) < 0)
753 if (opt_fsync && fsync(fd_new) < 0) {
754 log_dbg("Write error, fsync.");
758 *bytes += (uint64_t)s2;
759 print_progress(rc, *bytes, 0);
762 return quit ? -EAGAIN : 0;
765 static int copy_data(struct reenc_ctx *rc)
767 size_t block_size = opt_bsize * 1024 * 1024;
768 int fd_old = -1, fd_new = -1;
773 log_dbg("Data copy preparation.");
775 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
777 log_err(_("Cannot open temporary LUKS header file.\n"));
781 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
783 log_err(_("Cannot open temporary LUKS header file.\n"));
788 if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size) < 0) {
789 log_err(_("Cannot get device size.\n"));
793 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
794 log_err(_("Allocation of aligned memory failed.\n"));
800 gettimeofday(&rc->start_time, NULL);
802 if (rc->reencrypt_direction == FORWARD)
803 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
805 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
808 print_progress(rc, bytes, 1);
811 log_err(_("Interrupted by a signal.\n"));
813 log_err(_("IO error during reencryption.\n"));
825 static int initialize_uuid(struct reenc_ctx *rc)
827 struct crypt_device *cd = NULL;
830 log_dbg("Initialising UUID.");
832 /* Try to load LUKS from device */
833 if ((r = crypt_init(&cd, rc->device)))
835 crypt_set_log_callback(cd, _quiet_log, NULL);
836 r = crypt_load(cd, CRYPT_LUKS1, NULL);
838 rc->device_uuid = strdup(crypt_get_uuid(cd));
840 /* Reencryption already in progress - magic header? */
841 r = device_check(rc, CHECK_UNUSABLE);
847 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
848 const char *msg, int slot_check)
850 int r = -EINVAL, slot, retry_count;
852 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
854 retry_count = opt_tries ?: 1;
855 while (retry_count--) {
857 r = crypt_get_key(msg, &rc->p[slot].password,
858 &rc->p[slot].passwordLen,
859 0, 0, NULL /*opt_key_file*/,
866 /* library uses sigint internally, until it is fixed...*/
868 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
869 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 ((r = crypt_init(&cd, device)) ||
934 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
935 (r = crypt_set_data_device(cd, rc->device))) {
941 r = init_keyfile(rc, cd, opt_key_slot);
942 } else if (rc->in_progress) {
943 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "), CRYPT_ANY_SLOT);
944 } else for (i = 0; i < MAX_SLOT; i++) {
945 ki = crypt_keyslot_status(cd, i);
946 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
949 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
950 r = init_passphrase1(rc, cd, msg, i);
956 return r > 0 ? 0 : r;
959 static int initialize_context(struct reenc_ctx *rc, const char *device)
961 log_dbg("Initialising reencryption context.");
965 if (!(rc->device = strndup(device, PATH_MAX)))
968 if (device_check(rc, CHECK_OPEN) < 0)
971 if (initialize_uuid(rc)) {
972 log_err(_("Device %s is not a valid LUKS device.\n"), device);
976 /* Prepare device names */
977 if (snprintf(rc->log_file, PATH_MAX,
978 "LUKS-%s.log", rc->device_uuid) < 0)
980 if (snprintf(rc->header_file_org, PATH_MAX,
981 "LUKS-%s.org", rc->device_uuid) < 0)
983 if (snprintf(rc->header_file_new, PATH_MAX,
984 "LUKS-%s.new", rc->device_uuid) < 0)
987 /* Paths to encrypted devices */
988 if (snprintf(rc->crypt_path_org, PATH_MAX,
989 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
991 if (snprintf(rc->crypt_path_new, PATH_MAX,
992 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
997 if (open_log(rc) < 0) {
998 log_err(_("Cannot open reencryption log file.\n"));
1002 if (!rc->in_progress) {
1003 if (!opt_reduce_device_size)
1004 rc->reencrypt_direction = FORWARD;
1006 rc->reencrypt_direction = BACKWARD;
1007 rc->device_offset = (uint64_t)~0;
1014 static void destroy_context(struct reenc_ctx *rc)
1018 log_dbg("Destroying reencryption context.");
1023 if ((rc->reencrypt_direction == FORWARD &&
1024 rc->device_offset == rc->device_size) ||
1025 (rc->reencrypt_direction == BACKWARD &&
1026 (rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
1027 unlink(rc->log_file);
1028 unlink(rc->header_file_org);
1029 unlink(rc->header_file_new);
1032 for (i = 0; i < MAX_SLOT; i++)
1033 crypt_safe_free(rc->p[i].password);
1036 free(rc->device_uuid);
1039 static int run_reencrypt(const char *device)
1042 struct reenc_ctx rc = {};
1044 if (initialize_context(&rc, device))
1047 log_dbg("Running reencryption.");
1049 if (!rc.in_progress) {
1050 if ((r = initialize_passphrase(&rc, rc.device)) ||
1051 (r = backup_luks_headers(&rc)) ||
1052 (r = device_check(&rc, MAKE_UNUSABLE)))
1055 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1059 if ((r = activate_luks_headers(&rc)))
1062 if ((r = copy_data(&rc)))
1065 r = restore_luks_header(&rc);
1067 destroy_context(&rc);
1071 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
1072 int exitcode, const char *error,
1075 poptPrintUsage(popt_context, stderr, 0);
1077 log_err("%s: %s\n", more, error);
1078 poptFreeContext(popt_context);
1082 static void help(poptContext popt_context,
1083 enum poptCallbackReason reason __attribute__((unused)),
1084 struct poptOption *key,
1085 const char *arg __attribute__((unused)),
1086 void *data __attribute__((unused)))
1088 if (key->shortName == '?') {
1089 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1090 poptPrintHelp(popt_context, stdout, 0);
1093 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1096 static void _dbg_version_and_cmd(int argc, const char **argv)
1100 log_std("# %s %s processing \"", PACKAGE_REENC, PACKAGE_VERSION);
1101 for (i = 0; i < argc; i++) {
1104 log_std("%s", argv[i]);
1109 int main(int argc, const char **argv)
1111 static struct poptOption popt_help_options[] = {
1112 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1113 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1114 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1117 static struct poptOption popt_options[] = {
1118 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1119 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1120 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1121 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1122 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1123 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1124 { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
1125 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1126 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1127 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1128 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1129 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1130 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1131 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1132 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1133 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1134 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1135 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1136 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1137 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1138 { "reduce-device-size",'\0', POPT_ARG_INT, &opt_reduce_device_size, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("SECTORS") },
1141 poptContext popt_context;
1144 crypt_set_log_callback(NULL, _log, NULL);
1148 setlocale(LC_ALL, "");
1149 bindtextdomain(PACKAGE, LOCALEDIR);
1150 textdomain(PACKAGE);
1152 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1153 poptSetOtherOptionHelp(popt_context,
1154 N_("[OPTION...] <device>"));
1156 while((r = poptGetNextOpt(popt_context)) > 0) ;
1158 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1159 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1161 if (opt_version_mode) {
1162 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1163 poptFreeContext(popt_context);
1167 if (!opt_batch_mode) {
1168 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1169 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1170 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1171 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1174 action_argv = poptGetArgs(popt_context);
1176 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1177 poptGetInvocationName(popt_context));
1179 if (opt_random && opt_urandom)
1180 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1181 poptGetInvocationName(popt_context));
1183 if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
1184 opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0 ||
1185 opt_reduce_device_size < 0) {
1186 usage(popt_context, EXIT_FAILURE,
1187 _("Negative number for option not permitted."),
1188 poptGetInvocationName(popt_context));
1191 if (opt_bsize < 1 || opt_bsize > 64)
1192 usage(popt_context, EXIT_FAILURE,
1193 _("Only values between 1MiB and 64 MiB allowed for reencryption block size."),
1194 poptGetInvocationName(popt_context));
1196 if (opt_reduce_device_size > (64 * 1024 * 1024 / SECTOR_SIZE))
1197 usage(popt_context, EXIT_FAILURE,
1198 _("Maximum device reduce size is 64 MiB."),
1199 poptGetInvocationName(popt_context));
1201 if (opt_key_size % 8)
1202 usage(popt_context, EXIT_FAILURE,
1203 _("Key size must be a multiple of 8 bits"),
1204 poptGetInvocationName(popt_context));
1206 if (opt_key_slot != CRYPT_ANY_SLOT &&
1207 (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
1208 usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
1209 poptGetInvocationName(popt_context));
1211 if (opt_random && opt_urandom)
1212 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1213 poptGetInvocationName(popt_context));
1217 crypt_set_debug_level(-1);
1218 _dbg_version_and_cmd(argc, argv);
1221 r = run_reencrypt(action_argv[0]);
1223 poptFreeContext(popt_context);
1225 /* Translate exit code to simple codes */
1227 case 0: r = EXIT_SUCCESS; break;
1229 case -EBUSY: r = 5; break;
1231 case -ENODEV: r = 4; break;
1232 case -ENOMEM: r = 3; break;
1233 case -EPERM: r = 2; break;
1234 default: r = EXIT_FAILURE;