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 #include "cryptsetup.h"
22 #include <sys/ioctl.h>
25 #include <arpa/inet.h>
28 #define PACKAGE_REENC "crypt_reencrypt"
30 #define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee"
31 #define MAX_BCK_SECTORS 8192
33 static const char *opt_cipher = NULL;
34 static const char *opt_hash = NULL;
35 static const char *opt_key_file = NULL;
36 static long opt_keyfile_size = 0;
37 static long opt_keyfile_offset = 0;
38 static int opt_iteration_time = 1000;
39 static int opt_version_mode = 0;
40 static int opt_random = 0;
41 static int opt_urandom = 0;
42 static int opt_bsize = 4;
43 static int opt_directio = 0;
44 static int opt_fsync = 0;
45 static int opt_write_log = 0;
46 static int opt_tries = 3;
47 static int opt_key_slot = CRYPT_ANY_SLOT;
48 static int opt_key_size = 0;
49 static int opt_new = 0;
51 static const char *opt_reduce_size_str = NULL;
52 static uint64_t opt_reduce_size = 0;
54 static const char *opt_device_size_str = NULL;
55 static uint64_t opt_device_size = 0;
57 static const char **action_argv;
59 static volatile int quit = 0;
65 uint64_t device_size; /* overrided by parameter */
66 uint64_t device_size_real;
67 uint64_t device_offset;
68 uint64_t device_shift;
71 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
73 char header_file_org[PATH_MAX];
74 char header_file_new[PATH_MAX];
75 char log_file[PATH_MAX];
77 char crypt_path_org[PATH_MAX];
78 char crypt_path_new[PATH_MAX];
88 struct timeval start_time, end_time;
89 uint64_t resume_bytes;
92 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
93 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
103 static void _quiet_log(int level, const char *msg, void *usrptr)
107 tool_log(level, msg, usrptr);
110 static void int_handler(int sig __attribute__((__unused__)))
115 static void set_int_block(int block)
117 sigset_t signals_open;
119 sigemptyset(&signals_open);
120 sigaddset(&signals_open, SIGINT);
121 sigaddset(&signals_open, SIGTERM);
122 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
125 static void set_int_handler(void)
127 struct sigaction sigaction_open;
129 memset(&sigaction_open, 0, sizeof(struct sigaction));
130 sigaction_open.sa_handler = int_handler;
131 sigaction(SIGINT, &sigaction_open, 0);
132 sigaction(SIGTERM, &sigaction_open, 0);
136 /* The difference in seconds between two times in "timeval" format. */
137 static double time_diff(struct timeval start, struct timeval end)
139 return (end.tv_sec - start.tv_sec)
140 + (end.tv_usec - start.tv_usec) / 1E6;
143 static int alignment(int fd)
147 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
153 /* Depends on the first two fields of LUKS1 header format, magic and version */
154 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
161 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
163 if (errno == EBUSY) {
164 log_err(_("Cannot exclusively open %s, device in use.\n"),
168 log_err(_("Cannot open device %s\n"), rc->device);
172 if (set_magic == CHECK_OPEN) {
177 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
178 log_err(_("Allocation of aligned memory failed.\n"));
183 s = read(devfd, buf, SECTOR_SIZE);
184 if (s < 0 || s != SECTOR_SIZE) {
185 log_err(_("Cannot read device %s.\n"), rc->device);
190 /* Be sure that we do not process new version of header */
191 memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
192 version = ntohs(version);
194 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
196 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
197 memcpy(buf, NOMAGIC, MAGIC_L);
199 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
201 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
202 memcpy(buf, MAGIC, MAGIC_L);
204 } else if (set_magic == CHECK_UNUSABLE && version == 1) {
205 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
207 rc->device_uuid = strndup(&buf[0xa8], 40);
213 if (lseek(devfd, 0, SEEK_SET) == -1)
215 s = write(devfd, buf, SECTOR_SIZE);
216 if (s < 0 || s != SECTOR_SIZE) {
217 log_err(_("Cannot write device %s.\n"), rc->device);
221 log_dbg("LUKS signature check failed for %s.", rc->device);
224 memset(buf, 0, SECTOR_SIZE);
230 static int create_empty_header(const char *new_file, const char *old_file,
231 uint64_t data_sector)
238 /* Never create header > 4MiB */
239 if (data_sector > MAX_BCK_SECTORS)
240 data_sector = MAX_BCK_SECTORS;
242 /* new header file of the same size as old backup */
244 if (stat(old_file, &st) == -1 ||
245 (st.st_mode & S_IFMT) != S_IFREG ||
246 (st.st_size > 16 * 1024 * 1024))
252 * if requesting key size change, try to use offset
253 * here can be enough space to fit new key.
256 size = data_sector * SECTOR_SIZE;
258 /* if reducing size, be sure we have enough space */
260 size += opt_reduce_size;
262 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
264 if (!size || !(buf = malloc(size)))
266 memset(buf, 0, size);
268 fd = creat(new_file, S_IRUSR|S_IWUSR);
274 if (write(fd, buf, size) < size)
282 static int write_log(struct reenc_ctx *rc)
286 memset(rc->log_buf, 0, SECTOR_SIZE);
287 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
288 "version = %d\nUUID = %s\ndirection = %d\n"
289 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
290 1, rc->device_uuid, rc->reencrypt_direction,
291 rc->device_offset, rc->device_shift);
293 if (lseek(rc->log_fd, 0, SEEK_SET) == -1)
296 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
297 if (r < 0 || r != SECTOR_SIZE) {
298 log_err(_("Cannot write reencryption log file.\n"));
305 static int parse_line_log(struct reenc_ctx *rc, const char *line)
311 /* whole line is comment */
315 if (sscanf(line, "version = %d", &i) == 1) {
317 log_dbg("Log: Unexpected version = %i", i);
320 } else if (sscanf(line, "UUID = %40s", s) == 1) {
321 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
322 log_dbg("Log: Unexpected UUID %s", s);
325 } else if (sscanf(line, "direction = %d", &i) == 1) {
326 log_dbg("Log: direction = %i", i);
327 rc->reencrypt_direction = i;
328 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
329 log_dbg("Log: offset = %" PRIu64, u64);
330 rc->device_offset = u64;
331 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
332 log_dbg("Log: shift = %" PRIu64, u64);
333 rc->device_shift = u64;
340 static int parse_log(struct reenc_ctx *rc)
345 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
347 log_err(_("Cannot read reencryption log file.\n"));
351 rc->log_buf[SECTOR_SIZE - 1] = '\0';
354 end = strchr(start, '\n');
357 if (parse_line_log(rc, start)) {
358 log_err("Wrong log format.\n");
369 static void close_log(struct reenc_ctx *rc)
371 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
372 if (rc->log_fd != -1)
378 static int open_log(struct reenc_ctx *rc)
380 int flags, create_new;
383 if (!stat(rc->log_file, &st))
385 else if (errno == ENOENT)
391 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
392 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
393 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
394 if (rc->log_fd == -1)
397 log_std(_("Log file %s exists, resuming reencryption.\n"), rc->log_file);
398 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
399 rc->log_fd = open(rc->log_file, flags);
400 if (rc->log_fd == -1)
405 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
406 log_err(_("Allocation of aligned memory failed.\n"));
411 if (create_new && write_log(rc) < 0) {
416 /* Be sure it is correct format */
417 return parse_log(rc);
420 static int activate_luks_headers(struct reenc_ctx *rc)
422 struct crypt_device *cd = NULL, *cd_new = NULL;
425 log_dbg("Activating LUKS devices from headers.");
427 if ((r = crypt_init(&cd, rc->header_file_org)) ||
428 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
429 (r = crypt_set_data_device(cd, rc->device)))
432 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
433 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
434 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
437 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
438 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
439 (r = crypt_set_data_device(cd_new, rc->device)))
442 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
443 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
444 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
451 log_err(_("Activation of temporary devices failed.\n"));
455 static int create_new_header(struct reenc_ctx *rc, const char *cipher,
456 const char *cipher_mode, const char *uuid,
457 int key_size, struct crypt_params_luks1 *params)
459 struct crypt_device *cd_new = NULL;
462 if ((r = crypt_init(&cd_new, rc->header_file_new)))
466 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
467 else if (opt_urandom)
468 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
470 if (opt_iteration_time)
471 crypt_set_iteration_time(cd_new, opt_iteration_time);
473 if ((r = crypt_format(cd_new, CRYPT_LUKS1, cipher, cipher_mode,
474 uuid, NULL, key_size, params)))
476 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
478 for (i = 0; i < MAX_SLOT; i++) {
479 if (!rc->p[i].password)
481 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
482 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
484 log_verbose(_("Activated keyslot %i.\n"), r);
492 static int backup_luks_headers(struct reenc_ctx *rc)
494 struct crypt_device *cd = NULL;
495 struct crypt_params_luks1 params = {0};
496 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
499 log_dbg("Creating LUKS header backup for device %s.", rc->device);
501 if ((r = crypt_init(&cd, rc->device)) ||
502 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
505 crypt_set_confirm_callback(cd, NULL, NULL);
506 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
508 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
510 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
511 crypt_get_data_offset(cd))))
514 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
515 params.data_alignment = crypt_get_data_offset(cd);
516 params.data_alignment += ROUND_SECTOR(opt_reduce_size);
517 params.data_device = rc->device;
520 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
522 log_err(_("No known cipher specification pattern detected.\n"));
527 r = create_new_header(rc,
528 opt_cipher ? cipher : crypt_get_cipher(cd),
529 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
531 opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
536 log_err(_("Creation of LUKS backup headers failed.\n"));
540 /* Create fake header for original device */
541 static int backup_fake_header(struct reenc_ctx *rc)
543 struct crypt_device *cd_new = NULL;
544 struct crypt_params_luks1 params = {0};
545 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
549 log_dbg("Creating fake (cipher_null) header for original device.");
552 opt_key_size = DEFAULT_LUKS1_KEYBITS;
555 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
557 log_err(_("No known cipher specification pattern detected.\n"));
562 r = create_empty_header(rc->header_file_org, NULL, 0);
566 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
567 params.data_alignment = 0;
568 params.data_device = rc->device;
570 r = crypt_init(&cd_new, rc->header_file_org);
574 r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb",
575 NO_UUID, NULL, opt_key_size / 8, ¶ms);
579 r = crypt_keyslot_add_by_volume_key(cd_new, 0, NULL, 0,
580 rc->p[0].password, rc->p[0].passwordLen);
584 r = create_empty_header(rc->header_file_new, rc->header_file_org, 0);
588 params.data_alignment = ROUND_SECTOR(opt_reduce_size);
589 r = create_new_header(rc,
590 opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER,
591 opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE,
593 (opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8,
600 static void remove_headers(struct reenc_ctx *rc)
602 struct crypt_device *cd = NULL;
604 log_dbg("Removing headers.");
606 if (crypt_init(&cd, NULL))
608 crypt_set_log_callback(cd, _quiet_log, NULL);
609 if (*rc->header_file_org)
610 (void)crypt_deactivate(cd, rc->header_file_org);
611 if (*rc->header_file_new)
612 (void)crypt_deactivate(cd, rc->header_file_new);
616 static int restore_luks_header(struct reenc_ctx *rc)
618 struct crypt_device *cd = NULL;
621 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
623 r = crypt_init(&cd, rc->device);
625 crypt_set_confirm_callback(cd, NULL, NULL);
626 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
631 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
633 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
637 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
639 unsigned long long mbytes, eta;
640 struct timeval now_time;
643 gettimeofday(&now_time, NULL);
644 if (!final && time_diff(rc->end_time, now_time) < 0.5)
647 rc->end_time = now_time;
652 tdiff = time_diff(rc->start_time, rc->end_time);
656 mbytes = (bytes - rc->resume_bytes) / 1024 / 1024;
657 mib = (double)(mbytes) / tdiff;
661 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
663 /* vt100 code clear line */
665 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
666 "%4llu MiB written, speed %5.1f MiB/s%s"),
667 (double)bytes / rc->device_size * 100,
668 eta / 60, eta % 60, mbytes, mib,
672 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
673 size_t block_size, void *buf, uint64_t *bytes)
677 log_dbg("Reencrypting in forward direction.");
679 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
680 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
681 log_err(_("Cannot seek to device offset.\n"));
685 rc->resume_bytes = *bytes = rc->device_offset;
687 if (write_log(rc) < 0)
690 while (!quit && rc->device_offset < rc->device_size) {
691 s1 = read(fd_old, buf, block_size);
692 if (s1 < 0 || ((size_t)s1 != block_size &&
693 (rc->device_offset + s1) != rc->device_size)) {
694 log_dbg("Read error, expecting %d, got %d.",
695 (int)block_size, (int)s1);
699 /* If device_size is forced, never write more than limit */
700 if ((s1 + rc->device_offset) > rc->device_size)
701 s1 = rc->device_size - rc->device_offset;
703 s2 = write(fd_new, buf, s1);
705 log_dbg("Write error, expecting %d, got %d.",
706 (int)block_size, (int)s2);
710 rc->device_offset += s1;
711 if (opt_write_log && write_log(rc) < 0)
714 if (opt_fsync && fsync(fd_new) < 0) {
715 log_dbg("Write error, fsync.");
719 *bytes += (uint64_t)s2;
720 print_progress(rc, *bytes, 0);
723 return quit ? -EAGAIN : 0;
726 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
727 size_t block_size, void *buf, uint64_t *bytes)
729 ssize_t s1, s2, working_block;
730 off64_t working_offset;
732 log_dbg("Reencrypting in backward direction.");
734 if (!rc->in_progress) {
735 rc->device_offset = rc->device_size;
736 rc->resume_bytes = 0;
739 rc->resume_bytes = rc->device_size - rc->device_offset;
740 *bytes = rc->resume_bytes;
743 if (write_log(rc) < 0)
746 while (!quit && rc->device_offset) {
747 if (rc->device_offset < block_size) {
749 working_block = rc->device_offset;
751 working_offset = rc->device_offset - block_size;
752 working_block = block_size;
755 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
756 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
757 log_err(_("Cannot seek to device offset.\n"));
761 s1 = read(fd_old, buf, working_block);
762 if (s1 < 0 || (s1 != working_block)) {
763 log_dbg("Read error, expecting %d, got %d.",
764 (int)block_size, (int)s1);
768 s2 = write(fd_new, buf, working_block);
770 log_dbg("Write error, expecting %d, got %d.",
771 (int)block_size, (int)s2);
775 rc->device_offset -= s1;
776 if (opt_write_log && write_log(rc) < 0)
779 if (opt_fsync && fsync(fd_new) < 0) {
780 log_dbg("Write error, fsync.");
784 *bytes += (uint64_t)s2;
785 print_progress(rc, *bytes, 0);
788 return quit ? -EAGAIN : 0;
791 static int copy_data(struct reenc_ctx *rc)
793 size_t block_size = opt_bsize * 1024 * 1024;
794 int fd_old = -1, fd_new = -1;
799 log_dbg("Data copy preparation.");
801 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
803 log_err(_("Cannot open temporary LUKS header file.\n"));
807 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
809 log_err(_("Cannot open temporary LUKS header file.\n"));
814 if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size_real) < 0) {
815 log_err(_("Cannot get device size.\n"));
819 rc->device_size = opt_device_size ?: rc->device_size_real;
821 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
822 log_err(_("Allocation of aligned memory failed.\n"));
828 gettimeofday(&rc->start_time, NULL);
830 if (rc->reencrypt_direction == FORWARD)
831 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
833 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
836 print_progress(rc, bytes, 1);
839 log_err(_("Interrupted by a signal.\n"));
841 log_err(_("IO error during reencryption.\n"));
853 static int initialize_uuid(struct reenc_ctx *rc)
855 struct crypt_device *cd = NULL;
858 log_dbg("Initialising UUID.");
861 rc->device_uuid = strdup(NO_UUID);
865 /* Try to load LUKS from device */
866 if ((r = crypt_init(&cd, rc->device)))
868 crypt_set_log_callback(cd, _quiet_log, NULL);
869 r = crypt_load(cd, CRYPT_LUKS1, NULL);
871 rc->device_uuid = strdup(crypt_get_uuid(cd));
873 /* Reencryption already in progress - magic header? */
874 r = device_check(rc, CHECK_UNUSABLE);
880 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
881 const char *msg, int slot_to_check, int check)
883 int r = -EINVAL, slot, retry_count;
885 slot = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check;
887 retry_count = opt_tries ?: 1;
888 while (retry_count--) {
890 r = crypt_get_key(msg, &rc->p[slot].password,
891 &rc->p[slot].passwordLen,
892 0, 0, NULL /*opt_key_file*/,
899 /* library uses sigint internally, until it is fixed...*/
902 r = crypt_activate_by_passphrase(cd, NULL, slot_to_check,
903 rc->p[slot].password, rc->p[slot].passwordLen, 0);
908 crypt_safe_free(rc->p[slot].password);
909 rc->p[slot].password = NULL;
910 rc->p[slot].passwordLen = 0;
912 if (r < 0 && r != -EPERM)
918 log_err(_("No key available with this passphrase.\n"));
923 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
927 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
928 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
929 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
933 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
934 rc->p[slot].password, rc->p[slot].passwordLen, 0);
937 * Allow keyslot only if it is last slot or if user explicitly
938 * specify whch slot to use (IOW others will be disabled).
940 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
941 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
942 log_err(_("Key file can be used only with --key-slot or with "
943 "exactly one key slot active.\n"));
948 crypt_safe_free(rc->p[slot].password);
949 rc->p[slot].password = NULL;
950 rc->p[slot].passwordLen = 0;
952 log_err(_("No key available with this passphrase.\n"));
960 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
962 struct crypt_device *cd = NULL;
963 crypt_keyslot_info ki;
967 log_dbg("Passhrases initialization.");
969 if (opt_new && !rc->in_progress) {
970 r = init_passphrase1(rc, cd, _("Enter new LUKS passphrase: "), 0, 0);
971 return r > 0 ? 0 : r;
974 if ((r = crypt_init(&cd, device)) ||
975 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
976 (r = crypt_set_data_device(cd, rc->device))) {
982 r = init_keyfile(rc, cd, opt_key_slot);
983 } else if (rc->in_progress) {
984 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "),
986 } else for (i = 0; i < MAX_SLOT; i++) {
987 ki = crypt_keyslot_status(cd, i);
988 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
991 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
992 r = init_passphrase1(rc, cd, msg, i, 1);
998 return r > 0 ? 0 : r;
1001 static int initialize_context(struct reenc_ctx *rc, const char *device)
1003 log_dbg("Initialising reencryption context.");
1007 if (!(rc->device = strndup(device, PATH_MAX)))
1010 if (device_check(rc, CHECK_OPEN) < 0)
1013 if (initialize_uuid(rc)) {
1014 log_err(_("Device %s is not a valid LUKS device.\n"), device);
1018 /* Prepare device names */
1019 if (snprintf(rc->log_file, PATH_MAX,
1020 "LUKS-%s.log", rc->device_uuid) < 0)
1022 if (snprintf(rc->header_file_org, PATH_MAX,
1023 "LUKS-%s.org", rc->device_uuid) < 0)
1025 if (snprintf(rc->header_file_new, PATH_MAX,
1026 "LUKS-%s.new", rc->device_uuid) < 0)
1029 /* Paths to encrypted devices */
1030 if (snprintf(rc->crypt_path_org, PATH_MAX,
1031 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
1033 if (snprintf(rc->crypt_path_new, PATH_MAX,
1034 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
1039 if (open_log(rc) < 0) {
1040 log_err(_("Cannot open reencryption log file.\n"));
1044 if (!rc->in_progress) {
1045 if (!opt_reduce_size)
1046 rc->reencrypt_direction = FORWARD;
1048 rc->reencrypt_direction = BACKWARD;
1049 rc->device_offset = (uint64_t)~0;
1056 static void destroy_context(struct reenc_ctx *rc)
1060 log_dbg("Destroying reencryption context.");
1065 if ((rc->reencrypt_direction == FORWARD &&
1066 rc->device_offset == rc->device_size) ||
1067 (rc->reencrypt_direction == BACKWARD &&
1068 (rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
1069 unlink(rc->log_file);
1070 unlink(rc->header_file_org);
1071 unlink(rc->header_file_new);
1074 for (i = 0; i < MAX_SLOT; i++)
1075 crypt_safe_free(rc->p[i].password);
1078 free(rc->device_uuid);
1081 static int run_reencrypt(const char *device)
1084 struct reenc_ctx rc = {};
1086 if (initialize_context(&rc, device))
1089 log_dbg("Running reencryption.");
1091 if (!rc.in_progress) {
1093 if ((r = initialize_passphrase(&rc, rc.device)) ||
1094 (r = backup_fake_header(&rc)))
1096 } else if ((r = initialize_passphrase(&rc, rc.device)) ||
1097 (r = backup_luks_headers(&rc)) ||
1098 (r = device_check(&rc, MAKE_UNUSABLE)))
1101 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1105 if ((r = activate_luks_headers(&rc)))
1108 if ((r = copy_data(&rc)))
1111 r = restore_luks_header(&rc);
1113 destroy_context(&rc);
1117 static void help(poptContext popt_context,
1118 enum poptCallbackReason reason __attribute__((unused)),
1119 struct poptOption *key,
1120 const char *arg __attribute__((unused)),
1121 void *data __attribute__((unused)))
1123 if (key->shortName == '?') {
1124 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1125 poptPrintHelp(popt_context, stdout, 0);
1128 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1131 int main(int argc, const char **argv)
1133 static struct poptOption popt_help_options[] = {
1134 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1135 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1136 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1139 static struct poptOption popt_options[] = {
1140 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1141 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1142 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1143 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1144 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1145 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1146 { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
1147 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1148 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1149 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1150 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1151 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1152 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1153 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1154 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1155 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1156 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1157 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1158 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1159 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1160 { "reduce-device-size",'\0', POPT_ARG_STRING, &opt_reduce_size_str, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("bytes") },
1161 { "device-size", '\0', POPT_ARG_STRING, &opt_device_size_str, 0, N_("Use only specified device size (ignore rest of device). DANGEROUS!"), N_("bytes") },
1162 { "new", 'N', POPT_ARG_NONE,&opt_new, 0, N_("Create new header on not encrypted device."), NULL },
1165 poptContext popt_context;
1168 crypt_set_log_callback(NULL, tool_log, NULL);
1172 setlocale(LC_ALL, "");
1173 bindtextdomain(PACKAGE, LOCALEDIR);
1174 textdomain(PACKAGE);
1176 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1177 poptSetOtherOptionHelp(popt_context,
1178 _("[OPTION...] <device>"));
1180 while((r = poptGetNextOpt(popt_context)) > 0) ;
1182 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1183 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1185 if (opt_version_mode) {
1186 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1187 poptFreeContext(popt_context);
1191 if (!opt_batch_mode) {
1192 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1193 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1194 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1195 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1198 action_argv = poptGetArgs(popt_context);
1200 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1201 poptGetInvocationName(popt_context));
1203 if (opt_random && opt_urandom)
1204 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1205 poptGetInvocationName(popt_context));
1207 if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
1208 opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0) {
1209 usage(popt_context, EXIT_FAILURE,
1210 _("Negative number for option not permitted."),
1211 poptGetInvocationName(popt_context));
1214 if (opt_bsize < 1 || opt_bsize > 64)
1215 usage(popt_context, EXIT_FAILURE,
1216 _("Only values between 1 MiB and 64 MiB allowed for reencryption block size."),
1217 poptGetInvocationName(popt_context));
1219 if (opt_key_size % 8)
1220 usage(popt_context, EXIT_FAILURE,
1221 _("Key size must be a multiple of 8 bits"),
1222 poptGetInvocationName(popt_context));
1224 if (opt_key_slot != CRYPT_ANY_SLOT &&
1225 (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
1226 usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
1227 poptGetInvocationName(popt_context));
1229 if (opt_random && opt_urandom)
1230 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1231 poptGetInvocationName(popt_context));
1233 if (opt_device_size_str &&
1234 crypt_string_to_size(NULL, opt_device_size_str, &opt_device_size))
1235 usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
1236 poptGetInvocationName(popt_context));
1238 if (opt_reduce_size_str &&
1239 crypt_string_to_size(NULL, opt_reduce_size_str, &opt_reduce_size))
1240 usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
1241 poptGetInvocationName(popt_context));
1242 if (opt_reduce_size > 64 * 1024 * 1024)
1243 usage(popt_context, EXIT_FAILURE, _("Maximum device reduce size is 64 MiB."),
1244 poptGetInvocationName(popt_context));
1245 if (opt_reduce_size % SECTOR_SIZE)
1246 usage(popt_context, EXIT_FAILURE, _("Reduce size must be multiple of 512 bytes sector."),
1247 poptGetInvocationName(popt_context));
1249 if (opt_new && !opt_reduce_size)
1250 usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce-device-size."),
1251 poptGetInvocationName(popt_context));
1255 crypt_set_debug_level(-1);
1256 dbg_version_and_cmd(argc, argv);
1259 r = run_reencrypt(action_argv[0]);
1261 poptFreeContext(popt_context);
1263 return translate_errno(r);