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
26 #define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee"
27 #define MAX_BCK_SECTORS 8192
38 #include <sys/ioctl.h>
41 #include <arpa/inet.h>
46 #include "cryptsetup.h"
48 static int opt_verbose = 0;
49 static int opt_debug = 0;
50 static const char *opt_cipher = NULL;
51 static const char *opt_hash = NULL;
52 static const char *opt_key_file = NULL;
53 static long opt_keyfile_size = 0;
54 static long opt_keyfile_offset = 0;
55 static int opt_iteration_time = 1000;
56 static int opt_batch_mode = 0;
57 static int opt_version_mode = 0;
58 static int opt_random = 0;
59 static int opt_urandom = 0;
60 static int opt_bsize = 4;
61 static int opt_reduce_device_size = 0;
62 static int opt_directio = 0;
63 static int opt_fsync = 0;
64 static int opt_write_log = 0;
65 static int opt_tries = 3;
66 static int opt_key_slot = CRYPT_ANY_SLOT;
67 static int opt_key_size = 0;
68 static int opt_new = 0;
70 static const char **action_argv;
72 static volatile int quit = 0;
79 uint64_t device_offset;
80 uint64_t device_shift;
83 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
85 char header_file_org[PATH_MAX];
86 char header_file_new[PATH_MAX];
87 char log_file[PATH_MAX];
89 char crypt_path_org[PATH_MAX];
90 char crypt_path_new[PATH_MAX];
100 struct timeval start_time, end_time;
101 uint64_t restart_bytes;
104 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
105 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
115 __attribute__((format(printf, 5, 6)))
116 static void clogger(struct crypt_device *cd, int level, const char *file,
117 int line, const char *format, ...)
122 va_start(argp, format);
124 if (vasprintf(&target, format, argp) > 0) {
126 crypt_log(cd, level, target);
127 } else if (opt_debug)
128 printf("# %s\n", target);
135 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
139 case CRYPT_LOG_NORMAL:
142 case CRYPT_LOG_VERBOSE:
146 case CRYPT_LOG_ERROR:
149 case CRYPT_LOG_DEBUG:
151 printf("# %s\n", msg);
154 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
159 static void _quiet_log(int level, const char *msg, void *usrptr)
163 _log(level, msg, usrptr);
166 static void int_handler(int sig __attribute__((__unused__)))
171 static void set_int_block(int block)
173 sigset_t signals_open;
175 sigemptyset(&signals_open);
176 sigaddset(&signals_open, SIGINT);
177 sigaddset(&signals_open, SIGTERM);
178 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
181 static void set_int_handler(void)
183 struct sigaction sigaction_open;
185 memset(&sigaction_open, 0, sizeof(struct sigaction));
186 sigaction_open.sa_handler = int_handler;
187 sigaction(SIGINT, &sigaction_open, 0);
188 sigaction(SIGTERM, &sigaction_open, 0);
192 /* The difference in seconds between two times in "timeval" format. */
193 static double time_diff(struct timeval start, struct timeval end)
195 return (end.tv_sec - start.tv_sec)
196 + (end.tv_usec - start.tv_usec) / 1E6;
199 static int alignment(int fd)
203 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
209 /* Depends on the first two fields of LUKS1 header format, magic and version */
210 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
217 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
219 if (errno == EBUSY) {
220 log_err(_("Cannot exclusively open %s, device in use.\n"),
224 log_err(_("Cannot open device %s\n"), rc->device);
228 if (set_magic == CHECK_OPEN) {
233 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
234 log_err(_("Allocation of aligned memory failed.\n"));
239 s = read(devfd, buf, SECTOR_SIZE);
240 if (s < 0 || s != SECTOR_SIZE) {
241 log_err(_("Cannot read device %s.\n"), rc->device);
246 /* Be sure that we do not process new version of header */
247 memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
248 version = ntohs(version);
250 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
252 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
253 memcpy(buf, NOMAGIC, MAGIC_L);
255 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
257 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
258 memcpy(buf, MAGIC, MAGIC_L);
260 } else if (set_magic == CHECK_UNUSABLE && version == 1) {
261 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
263 rc->device_uuid = strndup(&buf[0xa8], 40);
269 if (lseek(devfd, 0, SEEK_SET) == -1)
271 s = write(devfd, buf, SECTOR_SIZE);
272 if (s < 0 || s != SECTOR_SIZE) {
273 log_err(_("Cannot write device %s.\n"), rc->device);
277 log_dbg("LUKS signature check failed for %s.", rc->device);
280 memset(buf, 0, SECTOR_SIZE);
286 static int create_empty_header(const char *new_file, const char *old_file,
287 uint64_t data_sector)
294 /* Never create header > 4MiB */
295 if (data_sector > MAX_BCK_SECTORS)
296 data_sector = MAX_BCK_SECTORS;
298 /* new header file of the same size as old backup */
300 if (stat(old_file, &st) == -1 ||
301 (st.st_mode & S_IFMT) != S_IFREG ||
302 (st.st_size > 16 * 1024 * 1024))
308 * if requesting key size change, try to use offset
309 * here can be enough space to fit new key.
312 size = data_sector * SECTOR_SIZE;
314 /* if reducing size, be sure we have enough space */
315 if (opt_reduce_device_size)
316 size += (opt_reduce_device_size * SECTOR_SIZE);
318 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
320 if (!size || !(buf = malloc(size)))
322 memset(buf, 0, size);
324 fd = creat(new_file, S_IRUSR|S_IWUSR);
330 if (write(fd, buf, size) < size)
338 static int write_log(struct reenc_ctx *rc)
342 memset(rc->log_buf, 0, SECTOR_SIZE);
343 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
344 "version = %d\nUUID = %s\ndirection = %d\n"
345 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
346 1, rc->device_uuid, rc->reencrypt_direction,
347 rc->device_offset, rc->device_shift);
349 lseek(rc->log_fd, 0, SEEK_SET);
350 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
351 if (r < 0 || r != SECTOR_SIZE) {
352 log_err(_("Cannot write reencryption log file.\n"));
359 static int parse_line_log(struct reenc_ctx *rc, const char *line)
365 /* whole line is comment */
369 if (sscanf(line, "version = %d", &i) == 1) {
371 log_dbg("Log: Unexpected version = %i", i);
374 } else if (sscanf(line, "UUID = %40s", s) == 1) {
375 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
376 log_dbg("Log: Unexpected UUID %s", s);
379 } else if (sscanf(line, "direction = %d", &i) == 1) {
380 log_dbg("Log: direction = %i", i);
381 rc->reencrypt_direction = i;
382 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
383 log_dbg("Log: offset = %" PRIu64, u64);
384 rc->device_offset = u64;
385 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
386 log_dbg("Log: shift = %" PRIu64, u64);
387 rc->device_shift = u64;
394 static int parse_log(struct reenc_ctx *rc)
399 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
401 log_err(_("Cannot read reencryption log file.\n"));
405 rc->log_buf[SECTOR_SIZE - 1] = '\0';
408 end = strchr(start, '\n');
411 if (parse_line_log(rc, start)) {
412 log_err("Wrong log format.\n");
423 static void close_log(struct reenc_ctx *rc)
425 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
426 if (rc->log_fd != -1)
432 static int open_log(struct reenc_ctx *rc)
434 int flags, create_new;
437 if (!stat(rc->log_file, &st))
439 else if (errno == ENOENT)
445 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
446 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
447 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
448 if (rc->log_fd == -1)
451 log_std(_("Log file %s exists, restarting reencryption.\n"), rc->log_file);
452 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
453 rc->log_fd = open(rc->log_file, flags);
454 if (rc->log_fd == -1)
459 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
460 log_err(_("Allocation of aligned memory failed.\n"));
465 if (create_new && write_log(rc) < 0) {
470 /* Be sure it is correct format */
471 return parse_log(rc);
474 static int activate_luks_headers(struct reenc_ctx *rc)
476 struct crypt_device *cd = NULL, *cd_new = NULL;
479 log_dbg("Activating LUKS devices from headers.");
481 if ((r = crypt_init(&cd, rc->header_file_org)) ||
482 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
483 (r = crypt_set_data_device(cd, rc->device)))
486 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
487 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
488 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
491 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
492 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
493 (r = crypt_set_data_device(cd_new, rc->device)))
496 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
497 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
498 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
505 log_err(_("Activation of temporary devices failed.\n"));
509 static int create_new_header(struct reenc_ctx *rc, const char *cipher,
510 const char *cipher_mode, const char *uuid,
511 int key_size, struct crypt_params_luks1 *params)
513 struct crypt_device *cd_new = NULL;
516 if ((r = crypt_init(&cd_new, rc->header_file_new)))
520 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
521 else if (opt_urandom)
522 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
524 if (opt_iteration_time)
525 crypt_set_iteration_time(cd_new, opt_iteration_time);
527 if ((r = crypt_format(cd_new, CRYPT_LUKS1, cipher, cipher_mode,
528 uuid, NULL, key_size, params)))
530 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
532 for (i = 0; i < MAX_SLOT; i++) {
533 if (!rc->p[i].password)
535 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
536 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
538 log_verbose(_("Activated keyslot %i.\n"), r);
546 static int backup_luks_headers(struct reenc_ctx *rc)
548 struct crypt_device *cd = NULL;
549 struct crypt_params_luks1 params = {0};
550 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
553 log_dbg("Creating LUKS header backup for device %s.", rc->device);
555 if ((r = crypt_init(&cd, rc->device)) ||
556 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
559 crypt_set_confirm_callback(cd, NULL, NULL);
560 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
562 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
564 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
565 crypt_get_data_offset(cd))))
568 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
569 params.data_alignment = crypt_get_data_offset(cd);
570 params.data_alignment += opt_reduce_device_size;
571 params.data_device = rc->device;
574 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
576 log_err(_("No known cipher specification pattern detected.\n"));
581 r = create_new_header(rc,
582 opt_cipher ? cipher : crypt_get_cipher(cd),
583 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
585 opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
590 log_err(_("Creation of LUKS backup headers failed.\n"));
594 /* Create fake header for original device */
595 static int backup_fake_header(struct reenc_ctx *rc)
597 struct crypt_device *cd_new = NULL;
598 struct crypt_params_luks1 params = {0};
599 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
603 log_dbg("Creating fake (cipher_null) header for original device.");
606 opt_key_size = DEFAULT_LUKS1_KEYBITS;
609 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
611 log_err(_("No known cipher specification pattern detected.\n"));
616 r = create_empty_header(rc->header_file_org, NULL, 0);
620 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
621 params.data_alignment = 0;
622 params.data_device = rc->device;
624 r = crypt_init(&cd_new, rc->header_file_org);
628 r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb",
629 NO_UUID, NULL, opt_key_size / 8, ¶ms);
633 r = crypt_keyslot_add_by_volume_key(cd_new, 0, NULL, 0,
634 rc->p[0].password, rc->p[0].passwordLen);
638 r = create_empty_header(rc->header_file_new, rc->header_file_org, 0);
642 params.data_alignment = opt_reduce_device_size;
643 r = create_new_header(rc,
644 opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER,
645 opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE,
647 (opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8,
654 static void remove_headers(struct reenc_ctx *rc)
656 struct crypt_device *cd = NULL;
658 log_dbg("Removing headers.");
660 if (crypt_init(&cd, NULL))
662 crypt_set_log_callback(cd, _quiet_log, NULL);
663 if (*rc->header_file_org)
664 (void)crypt_deactivate(cd, rc->header_file_org);
665 if (*rc->header_file_new)
666 (void)crypt_deactivate(cd, rc->header_file_new);
670 static int restore_luks_header(struct reenc_ctx *rc)
672 struct crypt_device *cd = NULL;
675 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
677 r = crypt_init(&cd, rc->device);
679 crypt_set_confirm_callback(cd, NULL, NULL);
680 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
685 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
687 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
691 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
693 unsigned long long mbytes, eta;
694 struct timeval now_time;
697 gettimeofday(&now_time, NULL);
698 if (!final && time_diff(rc->end_time, now_time) < 0.5)
701 rc->end_time = now_time;
706 tdiff = time_diff(rc->start_time, rc->end_time);
710 mbytes = (bytes - rc->restart_bytes) / 1024 / 1024;
711 mib = (double)(mbytes) / tdiff;
715 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
717 /* vt100 code clear line */
719 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
720 "%4llu MiB written, speed %5.1f MiB/s%s"),
721 (double)bytes / rc->device_size * 100,
722 eta / 60, eta % 60, mbytes, mib,
726 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
727 size_t block_size, void *buf, uint64_t *bytes)
731 log_dbg("Reencrypting in forward direction.");
733 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
734 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
735 log_err(_("Cannot seek to device offset.\n"));
739 rc->restart_bytes = *bytes = rc->device_offset;
741 if (write_log(rc) < 0)
744 while (!quit && rc->device_offset < rc->device_size) {
745 s1 = read(fd_old, buf, block_size);
746 if (s1 < 0 || ((size_t)s1 != block_size &&
747 (rc->device_offset + s1) != rc->device_size)) {
748 log_dbg("Read error, expecting %d, got %d.",
749 (int)block_size, (int)s1);
753 s2 = write(fd_new, buf, s1);
755 log_dbg("Write error, expecting %d, got %d.",
756 (int)block_size, (int)s2);
760 rc->device_offset += s1;
761 if (opt_write_log && write_log(rc) < 0)
764 if (opt_fsync && fsync(fd_new) < 0) {
765 log_dbg("Write error, fsync.");
769 *bytes += (uint64_t)s2;
770 print_progress(rc, *bytes, 0);
773 return quit ? -EAGAIN : 0;
776 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
777 size_t block_size, void *buf, uint64_t *bytes)
779 ssize_t s1, s2, working_block;
780 off64_t working_offset;
782 log_dbg("Reencrypting in backward direction.");
784 if (!rc->in_progress) {
785 rc->device_offset = rc->device_size;
786 rc->restart_bytes = 0;
789 rc->restart_bytes = rc->device_size - rc->device_offset;
790 *bytes = rc->restart_bytes;
793 if (write_log(rc) < 0)
796 while (!quit && rc->device_offset) {
797 if (rc->device_offset < block_size) {
799 working_block = rc->device_offset;
801 working_offset = rc->device_offset - block_size;
802 working_block = block_size;
805 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
806 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
807 log_err(_("Cannot seek to device offset.\n"));
811 s1 = read(fd_old, buf, working_block);
812 if (s1 < 0 || (s1 != working_block)) {
813 log_dbg("Read error, expecting %d, got %d.",
814 (int)block_size, (int)s1);
818 s2 = write(fd_new, buf, working_block);
820 log_dbg("Write error, expecting %d, got %d.",
821 (int)block_size, (int)s2);
825 rc->device_offset -= s1;
826 if (opt_write_log && write_log(rc) < 0)
829 if (opt_fsync && fsync(fd_new) < 0) {
830 log_dbg("Write error, fsync.");
834 *bytes += (uint64_t)s2;
835 print_progress(rc, *bytes, 0);
838 return quit ? -EAGAIN : 0;
841 static int copy_data(struct reenc_ctx *rc)
843 size_t block_size = opt_bsize * 1024 * 1024;
844 int fd_old = -1, fd_new = -1;
849 log_dbg("Data copy preparation.");
851 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
853 log_err(_("Cannot open temporary LUKS header file.\n"));
857 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
859 log_err(_("Cannot open temporary LUKS header file.\n"));
864 if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size) < 0) {
865 log_err(_("Cannot get device size.\n"));
869 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
870 log_err(_("Allocation of aligned memory failed.\n"));
876 gettimeofday(&rc->start_time, NULL);
878 if (rc->reencrypt_direction == FORWARD)
879 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
881 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
884 print_progress(rc, bytes, 1);
887 log_err(_("Interrupted by a signal.\n"));
889 log_err(_("IO error during reencryption.\n"));
901 static int initialize_uuid(struct reenc_ctx *rc)
903 struct crypt_device *cd = NULL;
906 log_dbg("Initialising UUID.");
909 rc->device_uuid = strdup(NO_UUID);
913 /* Try to load LUKS from device */
914 if ((r = crypt_init(&cd, rc->device)))
916 crypt_set_log_callback(cd, _quiet_log, NULL);
917 r = crypt_load(cd, CRYPT_LUKS1, NULL);
919 rc->device_uuid = strdup(crypt_get_uuid(cd));
921 /* Reencryption already in progress - magic header? */
922 r = device_check(rc, CHECK_UNUSABLE);
928 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
929 const char *msg, int slot_to_check, int check)
931 int r = -EINVAL, slot, retry_count;
933 slot = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check;
935 retry_count = opt_tries ?: 1;
936 while (retry_count--) {
938 r = crypt_get_key(msg, &rc->p[slot].password,
939 &rc->p[slot].passwordLen,
940 0, 0, NULL /*opt_key_file*/,
947 /* library uses sigint internally, until it is fixed...*/
950 r = crypt_activate_by_passphrase(cd, NULL, slot_to_check,
951 rc->p[slot].password, rc->p[slot].passwordLen, 0);
956 crypt_safe_free(rc->p[slot].password);
957 rc->p[slot].password = NULL;
958 rc->p[slot].passwordLen = 0;
960 if (r < 0 && r != -EPERM)
966 log_err(_("No key available with this passphrase.\n"));
971 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
975 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
976 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
977 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
981 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
982 rc->p[slot].password, rc->p[slot].passwordLen, 0);
985 * Allow keyslot only if it is last slot or if user explicitly
986 * specify whch slot to use (IOW others will be disabled).
988 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
989 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
990 log_err(_("Key file can be used only with --key-slot or with "
991 "exactly one key slot active.\n"));
996 crypt_safe_free(rc->p[slot].password);
997 rc->p[slot].password = NULL;
998 rc->p[slot].passwordLen = 0;
1000 log_err(_("No key available with this passphrase.\n"));
1008 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
1010 struct crypt_device *cd = NULL;
1011 crypt_keyslot_info ki;
1015 log_dbg("Passhrases initialization.");
1017 if (opt_new && !rc->in_progress) {
1018 r = init_passphrase1(rc, cd, _("Enter new LUKS passphrase: "), 0, 0);
1019 return r > 0 ? 0 : r;
1022 if ((r = crypt_init(&cd, device)) ||
1023 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
1024 (r = crypt_set_data_device(cd, rc->device))) {
1030 r = init_keyfile(rc, cd, opt_key_slot);
1031 } else if (rc->in_progress) {
1032 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "),
1034 } else for (i = 0; i < MAX_SLOT; i++) {
1035 ki = crypt_keyslot_status(cd, i);
1036 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
1039 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
1040 r = init_passphrase1(rc, cd, msg, i, 1);
1046 return r > 0 ? 0 : r;
1049 static int initialize_context(struct reenc_ctx *rc, const char *device)
1051 log_dbg("Initialising reencryption context.");
1055 if (!(rc->device = strndup(device, PATH_MAX)))
1058 if (device_check(rc, CHECK_OPEN) < 0)
1061 if (initialize_uuid(rc)) {
1062 log_err(_("Device %s is not a valid LUKS device.\n"), device);
1066 /* Prepare device names */
1067 if (snprintf(rc->log_file, PATH_MAX,
1068 "LUKS-%s.log", rc->device_uuid) < 0)
1070 if (snprintf(rc->header_file_org, PATH_MAX,
1071 "LUKS-%s.org", rc->device_uuid) < 0)
1073 if (snprintf(rc->header_file_new, PATH_MAX,
1074 "LUKS-%s.new", rc->device_uuid) < 0)
1077 /* Paths to encrypted devices */
1078 if (snprintf(rc->crypt_path_org, PATH_MAX,
1079 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
1081 if (snprintf(rc->crypt_path_new, PATH_MAX,
1082 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
1087 if (open_log(rc) < 0) {
1088 log_err(_("Cannot open reencryption log file.\n"));
1092 if (!rc->in_progress) {
1093 if (!opt_reduce_device_size)
1094 rc->reencrypt_direction = FORWARD;
1096 rc->reencrypt_direction = BACKWARD;
1097 rc->device_offset = (uint64_t)~0;
1104 static void destroy_context(struct reenc_ctx *rc)
1108 log_dbg("Destroying reencryption context.");
1113 if ((rc->reencrypt_direction == FORWARD &&
1114 rc->device_offset == rc->device_size) ||
1115 (rc->reencrypt_direction == BACKWARD &&
1116 (rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
1117 unlink(rc->log_file);
1118 unlink(rc->header_file_org);
1119 unlink(rc->header_file_new);
1122 for (i = 0; i < MAX_SLOT; i++)
1123 crypt_safe_free(rc->p[i].password);
1126 free(rc->device_uuid);
1129 static int run_reencrypt(const char *device)
1132 struct reenc_ctx rc = {};
1134 if (initialize_context(&rc, device))
1137 log_dbg("Running reencryption.");
1139 if (!rc.in_progress) {
1141 if ((r = initialize_passphrase(&rc, rc.device)) ||
1142 (r = backup_fake_header(&rc)))
1144 } else if ((r = initialize_passphrase(&rc, rc.device)) ||
1145 (r = backup_luks_headers(&rc)) ||
1146 (r = device_check(&rc, MAKE_UNUSABLE)))
1149 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1153 if ((r = activate_luks_headers(&rc)))
1156 if ((r = copy_data(&rc)))
1159 r = restore_luks_header(&rc);
1161 destroy_context(&rc);
1165 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
1166 int exitcode, const char *error,
1169 poptPrintUsage(popt_context, stderr, 0);
1171 log_err("%s: %s\n", more, error);
1172 poptFreeContext(popt_context);
1176 static void help(poptContext popt_context,
1177 enum poptCallbackReason reason __attribute__((unused)),
1178 struct poptOption *key,
1179 const char *arg __attribute__((unused)),
1180 void *data __attribute__((unused)))
1182 if (key->shortName == '?') {
1183 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1184 poptPrintHelp(popt_context, stdout, 0);
1187 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1190 static void _dbg_version_and_cmd(int argc, const char **argv)
1194 log_std("# %s %s processing \"", PACKAGE_REENC, PACKAGE_VERSION);
1195 for (i = 0; i < argc; i++) {
1198 log_std("%s", argv[i]);
1203 int main(int argc, const char **argv)
1205 static struct poptOption popt_help_options[] = {
1206 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1207 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1208 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1211 static struct poptOption popt_options[] = {
1212 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1213 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1214 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1215 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1216 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1217 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1218 { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
1219 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1220 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1221 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1222 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1223 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1224 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1225 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1226 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1227 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1228 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1229 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1230 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1231 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1232 { "reduce-device-size",'\0', POPT_ARG_INT, &opt_reduce_device_size, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("SECTORS") },
1233 { "new", 'N', POPT_ARG_NONE,&opt_new, 0, N_("Create new header on not encrypted device."), NULL },
1236 poptContext popt_context;
1239 crypt_set_log_callback(NULL, _log, NULL);
1243 setlocale(LC_ALL, "");
1244 bindtextdomain(PACKAGE, LOCALEDIR);
1245 textdomain(PACKAGE);
1247 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1248 poptSetOtherOptionHelp(popt_context,
1249 N_("[OPTION...] <device>"));
1251 while((r = poptGetNextOpt(popt_context)) > 0) ;
1253 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1254 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1256 if (opt_version_mode) {
1257 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1258 poptFreeContext(popt_context);
1262 if (!opt_batch_mode) {
1263 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1264 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1265 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1266 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1269 action_argv = poptGetArgs(popt_context);
1271 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1272 poptGetInvocationName(popt_context));
1274 if (opt_random && opt_urandom)
1275 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1276 poptGetInvocationName(popt_context));
1278 if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
1279 opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0 ||
1280 opt_reduce_device_size < 0) {
1281 usage(popt_context, EXIT_FAILURE,
1282 _("Negative number for option not permitted."),
1283 poptGetInvocationName(popt_context));
1286 if (opt_bsize < 1 || opt_bsize > 64)
1287 usage(popt_context, EXIT_FAILURE,
1288 _("Only values between 1MiB and 64 MiB allowed for reencryption block size."),
1289 poptGetInvocationName(popt_context));
1291 if (opt_reduce_device_size > (64 * 1024 * 1024 / SECTOR_SIZE))
1292 usage(popt_context, EXIT_FAILURE,
1293 _("Maximum device reduce size is 64 MiB."),
1294 poptGetInvocationName(popt_context));
1296 if (opt_key_size % 8)
1297 usage(popt_context, EXIT_FAILURE,
1298 _("Key size must be a multiple of 8 bits"),
1299 poptGetInvocationName(popt_context));
1301 if (opt_key_slot != CRYPT_ANY_SLOT &&
1302 (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
1303 usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
1304 poptGetInvocationName(popt_context));
1306 if (opt_random && opt_urandom)
1307 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1308 poptGetInvocationName(popt_context));
1310 if (opt_new && !opt_reduce_device_size)
1311 usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce_device_size."),
1312 poptGetInvocationName(popt_context));
1316 crypt_set_debug_level(-1);
1317 _dbg_version_and_cmd(argc, argv);
1320 r = run_reencrypt(action_argv[0]);
1322 poptFreeContext(popt_context);
1324 /* Translate exit code to simple codes */
1326 case 0: r = EXIT_SUCCESS; break;
1328 case -EBUSY: r = 5; break;
1330 case -ENODEV: r = 4; break;
1331 case -ENOMEM: r = 3; break;
1332 case -EPERM: r = 2; break;
1333 default: r = EXIT_FAILURE;