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 *opt_device_size_str = NULL;
71 static uint64_t opt_device_size = 0;
73 static const char **action_argv;
75 static volatile int quit = 0;
81 uint64_t device_size; /* overrided by parameter */
82 uint64_t device_size_real;
83 uint64_t device_offset;
84 uint64_t device_shift;
87 enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
89 char header_file_org[PATH_MAX];
90 char header_file_new[PATH_MAX];
91 char log_file[PATH_MAX];
93 char crypt_path_org[PATH_MAX];
94 char crypt_path_new[PATH_MAX];
104 struct timeval start_time, end_time;
105 uint64_t restart_bytes;
108 char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
109 char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
119 __attribute__((format(printf, 5, 6)))
120 static void clogger(struct crypt_device *cd, int level, const char *file,
121 int line, const char *format, ...)
126 va_start(argp, format);
128 if (vasprintf(&target, format, argp) > 0) {
130 crypt_log(cd, level, target);
131 } else if (opt_debug)
132 printf("# %s\n", target);
139 static void _log(int level, const char *msg, void *usrptr __attribute__((unused)))
143 case CRYPT_LOG_NORMAL:
146 case CRYPT_LOG_VERBOSE:
150 case CRYPT_LOG_ERROR:
153 case CRYPT_LOG_DEBUG:
155 printf("# %s\n", msg);
158 fprintf(stderr, "Internal error on logging class for msg: %s", msg);
163 static void _quiet_log(int level, const char *msg, void *usrptr)
167 _log(level, msg, usrptr);
170 static void int_handler(int sig __attribute__((__unused__)))
175 static void set_int_block(int block)
177 sigset_t signals_open;
179 sigemptyset(&signals_open);
180 sigaddset(&signals_open, SIGINT);
181 sigaddset(&signals_open, SIGTERM);
182 sigprocmask(block ? SIG_SETMASK : SIG_UNBLOCK, &signals_open, NULL);
185 static void set_int_handler(void)
187 struct sigaction sigaction_open;
189 memset(&sigaction_open, 0, sizeof(struct sigaction));
190 sigaction_open.sa_handler = int_handler;
191 sigaction(SIGINT, &sigaction_open, 0);
192 sigaction(SIGTERM, &sigaction_open, 0);
196 /* The difference in seconds between two times in "timeval" format. */
197 static double time_diff(struct timeval start, struct timeval end)
199 return (end.tv_sec - start.tv_sec)
200 + (end.tv_usec - start.tv_usec) / 1E6;
203 static int alignment(int fd)
207 alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
213 /* Depends on the first two fields of LUKS1 header format, magic and version */
214 static int device_check(struct reenc_ctx *rc, header_magic set_magic)
221 devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
223 if (errno == EBUSY) {
224 log_err(_("Cannot exclusively open %s, device in use.\n"),
228 log_err(_("Cannot open device %s\n"), rc->device);
232 if (set_magic == CHECK_OPEN) {
237 if (posix_memalign((void *)&buf, alignment(devfd), SECTOR_SIZE)) {
238 log_err(_("Allocation of aligned memory failed.\n"));
243 s = read(devfd, buf, SECTOR_SIZE);
244 if (s < 0 || s != SECTOR_SIZE) {
245 log_err(_("Cannot read device %s.\n"), rc->device);
250 /* Be sure that we do not process new version of header */
251 memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
252 version = ntohs(version);
254 if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
256 log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
257 memcpy(buf, NOMAGIC, MAGIC_L);
259 } else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
261 log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
262 memcpy(buf, MAGIC, MAGIC_L);
264 } else if (set_magic == CHECK_UNUSABLE && version == 1) {
265 r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
267 rc->device_uuid = strndup(&buf[0xa8], 40);
273 if (lseek(devfd, 0, SEEK_SET) == -1)
275 s = write(devfd, buf, SECTOR_SIZE);
276 if (s < 0 || s != SECTOR_SIZE) {
277 log_err(_("Cannot write device %s.\n"), rc->device);
281 log_dbg("LUKS signature check failed for %s.", rc->device);
284 memset(buf, 0, SECTOR_SIZE);
290 static int create_empty_header(const char *new_file, const char *old_file,
291 uint64_t data_sector)
298 /* Never create header > 4MiB */
299 if (data_sector > MAX_BCK_SECTORS)
300 data_sector = MAX_BCK_SECTORS;
302 /* new header file of the same size as old backup */
304 if (stat(old_file, &st) == -1 ||
305 (st.st_mode & S_IFMT) != S_IFREG ||
306 (st.st_size > 16 * 1024 * 1024))
312 * if requesting key size change, try to use offset
313 * here can be enough space to fit new key.
316 size = data_sector * SECTOR_SIZE;
318 /* if reducing size, be sure we have enough space */
319 if (opt_reduce_device_size)
320 size += (opt_reduce_device_size * SECTOR_SIZE);
322 log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
324 if (!size || !(buf = malloc(size)))
326 memset(buf, 0, size);
328 fd = creat(new_file, S_IRUSR|S_IWUSR);
334 if (write(fd, buf, size) < size)
342 static int write_log(struct reenc_ctx *rc)
346 memset(rc->log_buf, 0, SECTOR_SIZE);
347 snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
348 "version = %d\nUUID = %s\ndirection = %d\n"
349 "offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
350 1, rc->device_uuid, rc->reencrypt_direction,
351 rc->device_offset, rc->device_shift);
353 lseek(rc->log_fd, 0, SEEK_SET);
354 r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
355 if (r < 0 || r != SECTOR_SIZE) {
356 log_err(_("Cannot write reencryption log file.\n"));
363 static int parse_line_log(struct reenc_ctx *rc, const char *line)
369 /* whole line is comment */
373 if (sscanf(line, "version = %d", &i) == 1) {
375 log_dbg("Log: Unexpected version = %i", i);
378 } else if (sscanf(line, "UUID = %40s", s) == 1) {
379 if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
380 log_dbg("Log: Unexpected UUID %s", s);
383 } else if (sscanf(line, "direction = %d", &i) == 1) {
384 log_dbg("Log: direction = %i", i);
385 rc->reencrypt_direction = i;
386 } else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
387 log_dbg("Log: offset = %" PRIu64, u64);
388 rc->device_offset = u64;
389 } else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
390 log_dbg("Log: shift = %" PRIu64, u64);
391 rc->device_shift = u64;
398 static int parse_log(struct reenc_ctx *rc)
403 s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
405 log_err(_("Cannot read reencryption log file.\n"));
409 rc->log_buf[SECTOR_SIZE - 1] = '\0';
412 end = strchr(start, '\n');
415 if (parse_line_log(rc, start)) {
416 log_err("Wrong log format.\n");
427 static void close_log(struct reenc_ctx *rc)
429 log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
430 if (rc->log_fd != -1)
436 static int open_log(struct reenc_ctx *rc)
438 int flags, create_new;
441 if (!stat(rc->log_file, &st))
443 else if (errno == ENOENT)
449 log_dbg("Creating LUKS reencryption log file %s.", rc->log_file);
450 flags = opt_directio ? O_RDWR|O_CREAT|O_DIRECT : O_RDWR|O_CREAT;
451 rc->log_fd = open(rc->log_file, flags, S_IRUSR|S_IWUSR);
452 if (rc->log_fd == -1)
455 log_std(_("Log file %s exists, restarting reencryption.\n"), rc->log_file);
456 flags = opt_directio ? O_RDWR|O_DIRECT : O_RDWR;
457 rc->log_fd = open(rc->log_file, flags);
458 if (rc->log_fd == -1)
463 if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
464 log_err(_("Allocation of aligned memory failed.\n"));
469 if (create_new && write_log(rc) < 0) {
474 /* Be sure it is correct format */
475 return parse_log(rc);
478 static int activate_luks_headers(struct reenc_ctx *rc)
480 struct crypt_device *cd = NULL, *cd_new = NULL;
483 log_dbg("Activating LUKS devices from headers.");
485 if ((r = crypt_init(&cd, rc->header_file_org)) ||
486 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
487 (r = crypt_set_data_device(cd, rc->device)))
490 if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
491 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
492 CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
495 if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
496 (r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
497 (r = crypt_set_data_device(cd_new, rc->device)))
500 if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
501 opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
502 CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
509 log_err(_("Activation of temporary devices failed.\n"));
513 static int create_new_header(struct reenc_ctx *rc, const char *cipher,
514 const char *cipher_mode, const char *uuid,
515 int key_size, struct crypt_params_luks1 *params)
517 struct crypt_device *cd_new = NULL;
520 if ((r = crypt_init(&cd_new, rc->header_file_new)))
524 crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
525 else if (opt_urandom)
526 crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
528 if (opt_iteration_time)
529 crypt_set_iteration_time(cd_new, opt_iteration_time);
531 if ((r = crypt_format(cd_new, CRYPT_LUKS1, cipher, cipher_mode,
532 uuid, NULL, key_size, params)))
534 log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
536 for (i = 0; i < MAX_SLOT; i++) {
537 if (!rc->p[i].password)
539 if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
540 NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
542 log_verbose(_("Activated keyslot %i.\n"), r);
550 static int backup_luks_headers(struct reenc_ctx *rc)
552 struct crypt_device *cd = NULL;
553 struct crypt_params_luks1 params = {0};
554 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
557 log_dbg("Creating LUKS header backup for device %s.", rc->device);
559 if ((r = crypt_init(&cd, rc->device)) ||
560 (r = crypt_load(cd, CRYPT_LUKS1, NULL)))
563 crypt_set_confirm_callback(cd, NULL, NULL);
564 if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
566 log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
568 if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
569 crypt_get_data_offset(cd))))
572 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
573 params.data_alignment = crypt_get_data_offset(cd);
574 params.data_alignment += opt_reduce_device_size;
575 params.data_device = rc->device;
578 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
580 log_err(_("No known cipher specification pattern detected.\n"));
585 r = create_new_header(rc,
586 opt_cipher ? cipher : crypt_get_cipher(cd),
587 opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
589 opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
594 log_err(_("Creation of LUKS backup headers failed.\n"));
598 /* Create fake header for original device */
599 static int backup_fake_header(struct reenc_ctx *rc)
601 struct crypt_device *cd_new = NULL;
602 struct crypt_params_luks1 params = {0};
603 char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
607 log_dbg("Creating fake (cipher_null) header for original device.");
610 opt_key_size = DEFAULT_LUKS1_KEYBITS;
613 r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
615 log_err(_("No known cipher specification pattern detected.\n"));
620 r = create_empty_header(rc->header_file_org, NULL, 0);
624 params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
625 params.data_alignment = 0;
626 params.data_device = rc->device;
628 r = crypt_init(&cd_new, rc->header_file_org);
632 r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb",
633 NO_UUID, NULL, opt_key_size / 8, ¶ms);
637 r = crypt_keyslot_add_by_volume_key(cd_new, 0, NULL, 0,
638 rc->p[0].password, rc->p[0].passwordLen);
642 r = create_empty_header(rc->header_file_new, rc->header_file_org, 0);
646 params.data_alignment = opt_reduce_device_size;
647 r = create_new_header(rc,
648 opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER,
649 opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE,
651 (opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8,
658 static void remove_headers(struct reenc_ctx *rc)
660 struct crypt_device *cd = NULL;
662 log_dbg("Removing headers.");
664 if (crypt_init(&cd, NULL))
666 crypt_set_log_callback(cd, _quiet_log, NULL);
667 if (*rc->header_file_org)
668 (void)crypt_deactivate(cd, rc->header_file_org);
669 if (*rc->header_file_new)
670 (void)crypt_deactivate(cd, rc->header_file_new);
674 static int restore_luks_header(struct reenc_ctx *rc)
676 struct crypt_device *cd = NULL;
679 log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
681 r = crypt_init(&cd, rc->device);
683 crypt_set_confirm_callback(cd, NULL, NULL);
684 r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
689 log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
691 log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
695 static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
697 unsigned long long mbytes, eta;
698 struct timeval now_time;
701 gettimeofday(&now_time, NULL);
702 if (!final && time_diff(rc->end_time, now_time) < 0.5)
705 rc->end_time = now_time;
710 tdiff = time_diff(rc->start_time, rc->end_time);
714 mbytes = (bytes - rc->restart_bytes) / 1024 / 1024;
715 mib = (double)(mbytes) / tdiff;
719 eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
721 /* vt100 code clear line */
723 log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
724 "%4llu MiB written, speed %5.1f MiB/s%s"),
725 (double)bytes / rc->device_size * 100,
726 eta / 60, eta % 60, mbytes, mib,
730 static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
731 size_t block_size, void *buf, uint64_t *bytes)
735 log_dbg("Reencrypting in forward direction.");
737 if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
738 lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
739 log_err(_("Cannot seek to device offset.\n"));
743 rc->restart_bytes = *bytes = rc->device_offset;
745 if (write_log(rc) < 0)
748 while (!quit && rc->device_offset < rc->device_size) {
749 s1 = read(fd_old, buf, block_size);
750 if (s1 < 0 || ((size_t)s1 != block_size &&
751 (rc->device_offset + s1) != rc->device_size)) {
752 log_dbg("Read error, expecting %d, got %d.",
753 (int)block_size, (int)s1);
757 /* If device_size is forced, never write more than limit */
758 if ((s1 + rc->device_offset) > rc->device_size)
759 s1 = rc->device_size - rc->device_offset;
761 s2 = write(fd_new, buf, s1);
763 log_dbg("Write error, expecting %d, got %d.",
764 (int)block_size, (int)s2);
768 rc->device_offset += s1;
769 if (opt_write_log && write_log(rc) < 0)
772 if (opt_fsync && fsync(fd_new) < 0) {
773 log_dbg("Write error, fsync.");
777 *bytes += (uint64_t)s2;
778 print_progress(rc, *bytes, 0);
781 return quit ? -EAGAIN : 0;
784 static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
785 size_t block_size, void *buf, uint64_t *bytes)
787 ssize_t s1, s2, working_block;
788 off64_t working_offset;
790 log_dbg("Reencrypting in backward direction.");
792 if (!rc->in_progress) {
793 rc->device_offset = rc->device_size;
794 rc->restart_bytes = 0;
797 rc->restart_bytes = rc->device_size - rc->device_offset;
798 *bytes = rc->restart_bytes;
801 if (write_log(rc) < 0)
804 while (!quit && rc->device_offset) {
805 if (rc->device_offset < block_size) {
807 working_block = rc->device_offset;
809 working_offset = rc->device_offset - block_size;
810 working_block = block_size;
813 if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
814 lseek64(fd_new, working_offset, SEEK_SET) < 0) {
815 log_err(_("Cannot seek to device offset.\n"));
819 s1 = read(fd_old, buf, working_block);
820 if (s1 < 0 || (s1 != working_block)) {
821 log_dbg("Read error, expecting %d, got %d.",
822 (int)block_size, (int)s1);
826 s2 = write(fd_new, buf, working_block);
828 log_dbg("Write error, expecting %d, got %d.",
829 (int)block_size, (int)s2);
833 rc->device_offset -= s1;
834 if (opt_write_log && write_log(rc) < 0)
837 if (opt_fsync && fsync(fd_new) < 0) {
838 log_dbg("Write error, fsync.");
842 *bytes += (uint64_t)s2;
843 print_progress(rc, *bytes, 0);
846 return quit ? -EAGAIN : 0;
849 static int copy_data(struct reenc_ctx *rc)
851 size_t block_size = opt_bsize * 1024 * 1024;
852 int fd_old = -1, fd_new = -1;
857 log_dbg("Data copy preparation.");
859 fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
861 log_err(_("Cannot open temporary LUKS header file.\n"));
865 fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
867 log_err(_("Cannot open temporary LUKS header file.\n"));
872 if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size_real) < 0) {
873 log_err(_("Cannot get device size.\n"));
877 rc->device_size = opt_device_size ?: rc->device_size_real;
879 if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
880 log_err(_("Allocation of aligned memory failed.\n"));
886 gettimeofday(&rc->start_time, NULL);
888 if (rc->reencrypt_direction == FORWARD)
889 r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
891 r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
894 print_progress(rc, bytes, 1);
897 log_err(_("Interrupted by a signal.\n"));
899 log_err(_("IO error during reencryption.\n"));
911 static int initialize_uuid(struct reenc_ctx *rc)
913 struct crypt_device *cd = NULL;
916 log_dbg("Initialising UUID.");
919 rc->device_uuid = strdup(NO_UUID);
923 /* Try to load LUKS from device */
924 if ((r = crypt_init(&cd, rc->device)))
926 crypt_set_log_callback(cd, _quiet_log, NULL);
927 r = crypt_load(cd, CRYPT_LUKS1, NULL);
929 rc->device_uuid = strdup(crypt_get_uuid(cd));
931 /* Reencryption already in progress - magic header? */
932 r = device_check(rc, CHECK_UNUSABLE);
938 static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
939 const char *msg, int slot_to_check, int check)
941 int r = -EINVAL, slot, retry_count;
943 slot = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check;
945 retry_count = opt_tries ?: 1;
946 while (retry_count--) {
948 r = crypt_get_key(msg, &rc->p[slot].password,
949 &rc->p[slot].passwordLen,
950 0, 0, NULL /*opt_key_file*/,
957 /* library uses sigint internally, until it is fixed...*/
960 r = crypt_activate_by_passphrase(cd, NULL, slot_to_check,
961 rc->p[slot].password, rc->p[slot].passwordLen, 0);
966 crypt_safe_free(rc->p[slot].password);
967 rc->p[slot].password = NULL;
968 rc->p[slot].passwordLen = 0;
970 if (r < 0 && r != -EPERM)
976 log_err(_("No key available with this passphrase.\n"));
981 static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
985 slot = (slot_check == CRYPT_ANY_SLOT) ? 0 : slot_check;
986 r = crypt_get_key(NULL, &rc->p[slot].password, &rc->p[slot].passwordLen,
987 opt_keyfile_offset, opt_keyfile_size, opt_key_file, 0, 0, cd);
991 r = crypt_activate_by_passphrase(cd, NULL, slot_check,
992 rc->p[slot].password, rc->p[slot].passwordLen, 0);
995 * Allow keyslot only if it is last slot or if user explicitly
996 * specify whch slot to use (IOW others will be disabled).
998 if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
999 crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
1000 log_err(_("Key file can be used only with --key-slot or with "
1001 "exactly one key slot active.\n"));
1006 crypt_safe_free(rc->p[slot].password);
1007 rc->p[slot].password = NULL;
1008 rc->p[slot].passwordLen = 0;
1010 log_err(_("No key available with this passphrase.\n"));
1018 static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
1020 struct crypt_device *cd = NULL;
1021 crypt_keyslot_info ki;
1025 log_dbg("Passhrases initialization.");
1027 if (opt_new && !rc->in_progress) {
1028 r = init_passphrase1(rc, cd, _("Enter new LUKS passphrase: "), 0, 0);
1029 return r > 0 ? 0 : r;
1032 if ((r = crypt_init(&cd, device)) ||
1033 (r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
1034 (r = crypt_set_data_device(cd, rc->device))) {
1040 r = init_keyfile(rc, cd, opt_key_slot);
1041 } else if (rc->in_progress) {
1042 r = init_passphrase1(rc, cd, _("Enter any LUKS passphrase: "),
1044 } else for (i = 0; i < MAX_SLOT; i++) {
1045 ki = crypt_keyslot_status(cd, i);
1046 if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
1049 snprintf(msg, sizeof(msg), _("Enter LUKS passphrase for key slot %u: "), i);
1050 r = init_passphrase1(rc, cd, msg, i, 1);
1056 return r > 0 ? 0 : r;
1059 static int initialize_context(struct reenc_ctx *rc, const char *device)
1061 log_dbg("Initialising reencryption context.");
1065 if (!(rc->device = strndup(device, PATH_MAX)))
1068 if (device_check(rc, CHECK_OPEN) < 0)
1071 if (initialize_uuid(rc)) {
1072 log_err(_("Device %s is not a valid LUKS device.\n"), device);
1076 /* Prepare device names */
1077 if (snprintf(rc->log_file, PATH_MAX,
1078 "LUKS-%s.log", rc->device_uuid) < 0)
1080 if (snprintf(rc->header_file_org, PATH_MAX,
1081 "LUKS-%s.org", rc->device_uuid) < 0)
1083 if (snprintf(rc->header_file_new, PATH_MAX,
1084 "LUKS-%s.new", rc->device_uuid) < 0)
1087 /* Paths to encrypted devices */
1088 if (snprintf(rc->crypt_path_org, PATH_MAX,
1089 "%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
1091 if (snprintf(rc->crypt_path_new, PATH_MAX,
1092 "%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
1097 if (open_log(rc) < 0) {
1098 log_err(_("Cannot open reencryption log file.\n"));
1102 if (!rc->in_progress) {
1103 if (!opt_reduce_device_size)
1104 rc->reencrypt_direction = FORWARD;
1106 rc->reencrypt_direction = BACKWARD;
1107 rc->device_offset = (uint64_t)~0;
1114 static void destroy_context(struct reenc_ctx *rc)
1118 log_dbg("Destroying reencryption context.");
1123 if ((rc->reencrypt_direction == FORWARD &&
1124 rc->device_offset == rc->device_size) ||
1125 (rc->reencrypt_direction == BACKWARD &&
1126 (rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
1127 unlink(rc->log_file);
1128 unlink(rc->header_file_org);
1129 unlink(rc->header_file_new);
1132 for (i = 0; i < MAX_SLOT; i++)
1133 crypt_safe_free(rc->p[i].password);
1136 free(rc->device_uuid);
1139 static int run_reencrypt(const char *device)
1142 struct reenc_ctx rc = {};
1144 if (initialize_context(&rc, device))
1147 log_dbg("Running reencryption.");
1149 if (!rc.in_progress) {
1151 if ((r = initialize_passphrase(&rc, rc.device)) ||
1152 (r = backup_fake_header(&rc)))
1154 } else if ((r = initialize_passphrase(&rc, rc.device)) ||
1155 (r = backup_luks_headers(&rc)) ||
1156 (r = device_check(&rc, MAKE_UNUSABLE)))
1159 if ((r = initialize_passphrase(&rc, rc.header_file_new)))
1163 if ((r = activate_luks_headers(&rc)))
1166 if ((r = copy_data(&rc)))
1169 r = restore_luks_header(&rc);
1171 destroy_context(&rc);
1175 static __attribute__ ((noreturn)) void usage(poptContext popt_context,
1176 int exitcode, const char *error,
1179 poptPrintUsage(popt_context, stderr, 0);
1181 log_err("%s: %s\n", more, error);
1182 poptFreeContext(popt_context);
1186 static void help(poptContext popt_context,
1187 enum poptCallbackReason reason __attribute__((unused)),
1188 struct poptOption *key,
1189 const char *arg __attribute__((unused)),
1190 void *data __attribute__((unused)))
1192 if (key->shortName == '?') {
1193 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1194 poptPrintHelp(popt_context, stdout, 0);
1197 usage(popt_context, EXIT_SUCCESS, NULL, NULL);
1200 static void _dbg_version_and_cmd(int argc, const char **argv)
1204 log_std("# %s %s processing \"", PACKAGE_REENC, PACKAGE_VERSION);
1205 for (i = 0; i < argc; i++) {
1208 log_std("%s", argv[i]);
1213 int main(int argc, const char **argv)
1215 static struct poptOption popt_help_options[] = {
1216 { NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
1217 { "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
1218 { "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
1221 static struct poptOption popt_options[] = {
1222 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
1223 { "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
1224 { "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
1225 { "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
1226 { "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
1227 { "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
1228 { "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
1229 { "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
1230 { "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
1231 { "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
1232 { "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
1233 { "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
1234 { "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
1235 { "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
1236 { "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accesing devices."), NULL },
1237 { "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
1238 { "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
1239 { "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
1240 { "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
1241 { "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
1242 { "reduce-device-size",'\0', POPT_ARG_INT, &opt_reduce_device_size, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("SECTORS") },
1243 { "device-size", '\0', POPT_ARG_STRING, &opt_device_size_str, 0, N_("Use only specified device size (ignore rest of device). DANGEROUS!"), N_("bytes") },
1244 { "new", 'N', POPT_ARG_NONE,&opt_new, 0, N_("Create new header on not encrypted device."), NULL },
1247 poptContext popt_context;
1250 crypt_set_log_callback(NULL, _log, NULL);
1254 setlocale(LC_ALL, "");
1255 bindtextdomain(PACKAGE, LOCALEDIR);
1256 textdomain(PACKAGE);
1258 popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
1259 poptSetOtherOptionHelp(popt_context,
1260 N_("[OPTION...] <device>"));
1262 while((r = poptGetNextOpt(popt_context)) > 0) ;
1264 usage(popt_context, EXIT_FAILURE, poptStrerror(r),
1265 poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
1267 if (opt_version_mode) {
1268 log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
1269 poptFreeContext(popt_context);
1273 if (!opt_batch_mode) {
1274 log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
1275 log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
1276 opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
1277 opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
1280 action_argv = poptGetArgs(popt_context);
1282 usage(popt_context, EXIT_FAILURE, _("Argument required."),
1283 poptGetInvocationName(popt_context));
1285 if (opt_random && opt_urandom)
1286 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1287 poptGetInvocationName(popt_context));
1289 if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
1290 opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0 ||
1291 opt_reduce_device_size < 0) {
1292 usage(popt_context, EXIT_FAILURE,
1293 _("Negative number for option not permitted."),
1294 poptGetInvocationName(popt_context));
1297 if (opt_bsize < 1 || opt_bsize > 64)
1298 usage(popt_context, EXIT_FAILURE,
1299 _("Only values between 1MiB and 64 MiB allowed for reencryption block size."),
1300 poptGetInvocationName(popt_context));
1302 if (opt_reduce_device_size > (64 * 1024 * 1024 / SECTOR_SIZE))
1303 usage(popt_context, EXIT_FAILURE,
1304 _("Maximum device reduce size is 64 MiB."),
1305 poptGetInvocationName(popt_context));
1307 if (opt_key_size % 8)
1308 usage(popt_context, EXIT_FAILURE,
1309 _("Key size must be a multiple of 8 bits"),
1310 poptGetInvocationName(popt_context));
1312 if (opt_key_slot != CRYPT_ANY_SLOT &&
1313 (opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
1314 usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
1315 poptGetInvocationName(popt_context));
1317 if (opt_random && opt_urandom)
1318 usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
1319 poptGetInvocationName(popt_context));
1321 if (opt_new && !opt_reduce_device_size)
1322 usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce_device_size."),
1323 poptGetInvocationName(popt_context));
1325 if (opt_device_size_str &&
1326 crypt_string_to_size(NULL, opt_device_size_str, &opt_device_size))
1327 usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
1328 poptGetInvocationName(popt_context));
1332 crypt_set_debug_level(-1);
1333 _dbg_version_and_cmd(argc, argv);
1336 r = run_reencrypt(action_argv[0]);
1338 poptFreeContext(popt_context);
1340 /* Translate exit code to simple codes */
1342 case 0: r = EXIT_SUCCESS; break;
1344 case -EBUSY: r = 5; break;
1346 case -ENODEV: r = 4; break;
1347 case -ENOMEM: r = 3; break;
1348 case -EPERM: r = 2; break;
1349 default: r = EXIT_FAILURE;