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7843415243d70e56fa5e681c1c7ca5d9032e0208
cryptsetup/src/cryptsetup_reencrypt.c
Milan Broz 7843415243 Move string_to_size to userspace tools.
2015-08-26 12:42:25 +02:00

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/*
* cryptsetup-reencrypt - crypt utility for offline re-encryption
*
* Copyright (C) 2012, Red Hat, Inc. All rights reserved.
* Copyright (C) 2012-2015, Milan Broz All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "cryptsetup.h"
#include <sys/ioctl.h>
#include <sys/time.h>
#include <linux/fs.h>
#include <arpa/inet.h>
#define PACKAGE_REENC "crypt_reencrypt"
#define NO_UUID "cafecafe-cafe-cafe-cafe-cafecafeeeee"
#define MAX_BCK_SECTORS 8192
static const char *opt_cipher = NULL;
static const char *opt_hash = NULL;
static const char *opt_key_file = NULL;
static long opt_keyfile_size = 0;
static long opt_keyfile_offset = 0;
static int opt_iteration_time = 1000;
static int opt_version_mode = 0;
static int opt_random = 0;
static int opt_urandom = 0;
static int opt_bsize = 4;
static int opt_directio = 0;
static int opt_fsync = 0;
static int opt_write_log = 0;
static int opt_tries = 3;
static int opt_key_slot = CRYPT_ANY_SLOT;
static int opt_key_size = 0;
static int opt_new = 0;
static int opt_keep_key = 0;
static int opt_decrypt = 0;
static const char *opt_reduce_size_str = NULL;
static uint64_t opt_reduce_size = 0;
static const char *opt_device_size_str = NULL;
static uint64_t opt_device_size = 0;
static const char **action_argv;
#define MAX_SLOT 8
struct reenc_ctx {
char *device;
char *device_uuid;
uint64_t device_size; /* overrided by parameter */
uint64_t device_size_new_real;
uint64_t device_size_org_real;
uint64_t device_offset;
uint64_t device_shift;
int in_progress:1;
enum { FORWARD = 0, BACKWARD = 1 } reencrypt_direction;
enum { REENCRYPT = 0, ENCRYPT = 1, DECRYPT = 2 } reencrypt_mode;
char header_file_org[PATH_MAX];
char header_file_new[PATH_MAX];
char log_file[PATH_MAX];
char crypt_path_org[PATH_MAX];
char crypt_path_new[PATH_MAX];
int log_fd;
char log_buf[SECTOR_SIZE];
struct {
char *password;
size_t passwordLen;
} p[MAX_SLOT];
int keyslot;
struct timeval start_time, end_time;
uint64_t resume_bytes;
};
char MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
char NOMAGIC[] = {'L','U','K','S', 0xde, 0xad};
int MAGIC_L = 6;
typedef enum {
MAKE_UNUSABLE,
MAKE_USABLE,
CHECK_UNUSABLE,
CHECK_OPEN,
} header_magic;
static void _quiet_log(int level, const char *msg, void *usrptr)
{
if (!opt_debug)
return;
tool_log(level, msg, usrptr);
}
/* The difference in seconds between two times in "timeval" format. */
static double time_diff(struct timeval start, struct timeval end)
{
return (end.tv_sec - start.tv_sec)
+ (end.tv_usec - start.tv_usec) / 1E6;
}
static int alignment(int fd)
{
int alignment;
alignment = fpathconf(fd, _PC_REC_XFER_ALIGN);
if (alignment < 0)
alignment = 4096;
return alignment;
}
static size_t pagesize(void)
{
long r = sysconf(_SC_PAGESIZE);
return r < 0 ? 4096 : (size_t)r;
}
/* Depends on the first two fields of LUKS1 header format, magic and version */
static int device_check(struct reenc_ctx *rc, header_magic set_magic)
{
char *buf = NULL;
int r, devfd;
ssize_t s;
uint16_t version;
size_t buf_size = pagesize();
devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
if (devfd == -1) {
if (errno == EBUSY) {
log_err(_("Cannot exclusively open %s, device in use.\n"),
rc->device);
return -EBUSY;
}
log_err(_("Cannot open device %s\n"), rc->device);
return -EINVAL;
}
if (set_magic == CHECK_OPEN) {
r = 0;
goto out;
}
if (posix_memalign((void *)&buf, alignment(devfd), buf_size)) {
log_err(_("Allocation of aligned memory failed.\n"));
r = -ENOMEM;
goto out;
}
s = read(devfd, buf, buf_size);
if (s < 0 || s != (ssize_t)buf_size) {
log_err(_("Cannot read device %s.\n"), rc->device);
r = -EIO;
goto out;
}
/* Be sure that we do not process new version of header */
memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
version = ntohs(version);
if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
version == 1) {
log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
memcpy(buf, NOMAGIC, MAGIC_L);
r = 0;
} else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
version == 1) {
log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
memcpy(buf, MAGIC, MAGIC_L);
r = 0;
} else if (set_magic == CHECK_UNUSABLE && version == 1) {
r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
if (!r)
rc->device_uuid = strndup(&buf[0xa8], 40);
goto out;
} else
r = -EINVAL;
if (!r) {
if (lseek(devfd, 0, SEEK_SET) == -1)
goto out;
s = write(devfd, buf, buf_size);
if (s < 0 || s != (ssize_t)buf_size) {
log_err(_("Cannot write device %s.\n"), rc->device);
r = -EIO;
}
} else
log_dbg("LUKS signature check failed for %s.", rc->device);
out:
if (buf)
memset(buf, 0, buf_size);
free(buf);
close(devfd);
return r;
}
static int create_empty_header(const char *new_file, const char *old_file,
uint64_t data_sector)
{
struct stat st;
ssize_t size = 0;
int fd, r = 0;
char *buf;
/* Never create header > 4MiB */
if (data_sector > MAX_BCK_SECTORS)
data_sector = MAX_BCK_SECTORS;
/* new header file of the same size as old backup */
if (old_file) {
if (stat(old_file, &st) == -1 ||
(st.st_mode & S_IFMT) != S_IFREG ||
(st.st_size > 16 * 1024 * 1024))
return -EINVAL;
size = st.st_size;
}
/*
* if requesting key size change, try to use offset
* here can be enough space to fit new key.
*/
if (opt_key_size)
size = data_sector * SECTOR_SIZE;
/* if reducing size, be sure we have enough space */
if (opt_reduce_size)
size += opt_reduce_size;
log_dbg("Creating empty file %s of size %lu.", new_file, (unsigned long)size);
if (!size || !(buf = malloc(size)))
return -ENOMEM;
memset(buf, 0, size);
fd = creat(new_file, S_IRUSR|S_IWUSR);
if(fd == -1) {
free(buf);
return -EINVAL;
}
if (write(fd, buf, size) < size)
r = -EIO;
close(fd);
free(buf);
return r;
}
static int write_log(struct reenc_ctx *rc)
{
ssize_t r;
memset(rc->log_buf, 0, SECTOR_SIZE);
snprintf(rc->log_buf, SECTOR_SIZE, "# LUKS reencryption log, DO NOT EDIT OR DELETE.\n"
"version = %d\nUUID = %s\ndirection = %d\nmode = %d\n"
"offset = %" PRIu64 "\nshift = %" PRIu64 "\n# EOF\n",
2, rc->device_uuid, rc->reencrypt_direction, rc->reencrypt_mode,
rc->device_offset, rc->device_shift);
if (lseek(rc->log_fd, 0, SEEK_SET) == -1)
return -EIO;
r = write(rc->log_fd, rc->log_buf, SECTOR_SIZE);
if (r < 0 || r != SECTOR_SIZE) {
log_err(_("Cannot write reencryption log file.\n"));
return -EIO;
}
return 0;
}
static int parse_line_log(struct reenc_ctx *rc, const char *line)
{
uint64_t u64;
int i;
char s[64];
/* whole line is comment */
if (*line == '#')
return 0;
if (sscanf(line, "version = %d", &i) == 1) {
if (i < 1 || i > 2) {
log_dbg("Log: Unexpected version = %i", i);
return -EINVAL;
}
} else if (sscanf(line, "UUID = %40s", s) == 1) {
if (!rc->device_uuid || strcmp(rc->device_uuid, s)) {
log_dbg("Log: Unexpected UUID %s", s);
return -EINVAL;
}
} else if (sscanf(line, "direction = %d", &i) == 1) {
log_dbg("Log: direction = %i", i);
rc->reencrypt_direction = i;
} else if (sscanf(line, "offset = %" PRIu64, &u64) == 1) {
log_dbg("Log: offset = %" PRIu64, u64);
rc->device_offset = u64;
} else if (sscanf(line, "shift = %" PRIu64, &u64) == 1) {
log_dbg("Log: shift = %" PRIu64, u64);
rc->device_shift = u64;
} else if (sscanf(line, "mode = %d", &i) == 1) { /* added in v2 */
log_dbg("Log: mode = %i", i);
rc->reencrypt_mode = i;
if (rc->reencrypt_mode != REENCRYPT &&
rc->reencrypt_mode != ENCRYPT &&
rc->reencrypt_mode != DECRYPT)
return -EINVAL;
} else
return -EINVAL;
return 0;
}
static int parse_log(struct reenc_ctx *rc)
{
char *start, *end;
ssize_t s;
s = read(rc->log_fd, rc->log_buf, SECTOR_SIZE);
if (s == -1) {
log_err(_("Cannot read reencryption log file.\n"));
return -EIO;
}
rc->log_buf[SECTOR_SIZE - 1] = '\0';
start = rc->log_buf;
do {
end = strchr(start, '\n');
if (end) {
*end++ = '\0';
if (parse_line_log(rc, start)) {
log_err("Wrong log format.\n");
return -EINVAL;
}
}
start = end;
} while (start);
return 0;
}
static void close_log(struct reenc_ctx *rc)
{
log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
if (rc->log_fd != -1)
close(rc->log_fd);
}
static int open_log(struct reenc_ctx *rc)
{
int flags = opt_fsync ? O_SYNC : 0;
rc->log_fd = open(rc->log_file, O_RDWR|O_EXCL|O_CREAT|flags, S_IRUSR|S_IWUSR);
if (rc->log_fd != -1) {
log_dbg("Created LUKS reencryption log file %s.", rc->log_file);
} else if (errno == EEXIST) {
log_std(_("Log file %s exists, resuming reencryption.\n"), rc->log_file);
rc->log_fd = open(rc->log_file, O_RDWR|flags);
rc->in_progress = 1;
}
if (rc->log_fd == -1)
return -EINVAL;
if (!rc->in_progress && write_log(rc) < 0) {
close_log(rc);
return -EIO;
}
/* Be sure it is correct format */
return parse_log(rc);
}
static int activate_luks_headers(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL, *cd_new = NULL;
const char *pwd_old, *pwd_new, pwd_empty[] = "";
size_t pwd_old_len, pwd_new_len;
int r;
log_dbg("Activating LUKS devices from headers.");
/* Never use real password for empty header processing */
if (rc->reencrypt_mode == REENCRYPT) {
pwd_old = rc->p[rc->keyslot].password;
pwd_old_len = rc->p[rc->keyslot].passwordLen;
pwd_new = pwd_old;
pwd_new_len = pwd_old_len;
} else if (rc->reencrypt_mode == DECRYPT) {
pwd_old = rc->p[rc->keyslot].password;
pwd_old_len = rc->p[rc->keyslot].passwordLen;
pwd_new = pwd_empty;
pwd_new_len = 0;
} else if (rc->reencrypt_mode == ENCRYPT) {
pwd_old = pwd_empty;
pwd_old_len = 0;
pwd_new = rc->p[rc->keyslot].password;
pwd_new_len = rc->p[rc->keyslot].passwordLen;
}
if ((r = crypt_init(&cd, rc->header_file_org)) ||
(r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
(r = crypt_set_data_device(cd, rc->device)))
goto out;
log_verbose(_("Activating temporary device using old LUKS header.\n"));
if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
opt_key_slot, pwd_old, pwd_old_len,
CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
goto out;
if ((r = crypt_init(&cd_new, rc->header_file_new)) ||
(r = crypt_load(cd_new, CRYPT_LUKS1, NULL)) ||
(r = crypt_set_data_device(cd_new, rc->device)))
goto out;
log_verbose(_("Activating temporary device using new LUKS header.\n"));
if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
opt_key_slot, pwd_new, pwd_new_len,
CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
goto out;
r = 0;
out:
crypt_free(cd);
crypt_free(cd_new);
if (r < 0)
log_err(_("Activation of temporary devices failed.\n"));
return r;
}
static int create_new_header(struct reenc_ctx *rc, const char *cipher,
const char *cipher_mode, const char *uuid,
const char *key, int key_size,
struct crypt_params_luks1 *params)
{
struct crypt_device *cd_new = NULL;
int i, r;
if ((r = crypt_init(&cd_new, rc->header_file_new)))
goto out;
if (opt_random)
crypt_set_rng_type(cd_new, CRYPT_RNG_RANDOM);
else if (opt_urandom)
crypt_set_rng_type(cd_new, CRYPT_RNG_URANDOM);
if (opt_iteration_time)
crypt_set_iteration_time(cd_new, opt_iteration_time);
if ((r = crypt_format(cd_new, CRYPT_LUKS1, cipher, cipher_mode,
uuid, key, key_size, params)))
goto out;
log_verbose(_("New LUKS header for device %s created.\n"), rc->device);
for (i = 0; i < MAX_SLOT; i++) {
if (!rc->p[i].password)
continue;
if ((r = crypt_keyslot_add_by_volume_key(cd_new, i,
NULL, 0, rc->p[i].password, rc->p[i].passwordLen)) < 0)
goto out;
log_verbose(_("Activated keyslot %i.\n"), r);
r = 0;
}
out:
crypt_free(cd_new);
return r;
}
static int backup_luks_headers(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL;
struct crypt_params_luks1 params = {0};
char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
char *old_key = NULL;
size_t old_key_size;
int r;
log_dbg("Creating LUKS header backup for device %s.", rc->device);
if ((r = crypt_init(&cd, rc->device)) ||
(r = crypt_load(cd, CRYPT_LUKS1, NULL)))
goto out;
crypt_set_confirm_callback(cd, NULL, NULL);
if ((r = crypt_header_backup(cd, CRYPT_LUKS1, rc->header_file_org)))
goto out;
log_verbose(_("LUKS header backup of device %s created.\n"), rc->device);
/* For decrypt, new header will be fake one, so we are done here. */
if (rc->reencrypt_mode == DECRYPT)
goto out;
if ((r = create_empty_header(rc->header_file_new, rc->header_file_org,
crypt_get_data_offset(cd))))
goto out;
params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
params.data_alignment = crypt_get_data_offset(cd);
params.data_alignment += ROUND_SECTOR(opt_reduce_size);
params.data_device = rc->device;
if (opt_cipher) {
r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
if (r < 0) {
log_err(_("No known cipher specification pattern detected.\n"));
goto out;
}
}
if (opt_keep_key) {
log_dbg("Keeping key from old header.");
old_key_size = crypt_get_volume_key_size(cd);
old_key = crypt_safe_alloc(old_key_size);
if (!old_key) {
r = -ENOMEM;
goto out;
}
r = crypt_volume_key_get(cd, CRYPT_ANY_SLOT, old_key, &old_key_size,
rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen);
if (r < 0)
goto out;
}
r = create_new_header(rc,
opt_cipher ? cipher : crypt_get_cipher(cd),
opt_cipher ? cipher_mode : crypt_get_cipher_mode(cd),
crypt_get_uuid(cd),
old_key,
opt_key_size ? opt_key_size / 8 : crypt_get_volume_key_size(cd),
&params);
out:
crypt_free(cd);
crypt_safe_free(old_key);
if (r)
log_err(_("Creation of LUKS backup headers failed.\n"));
return r;
}
/* Create fake header for original device */
static int backup_fake_header(struct reenc_ctx *rc)
{
struct crypt_device *cd_new = NULL;
struct crypt_params_luks1 params = {0};
char cipher [MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN];
const char *header_file_fake;
int r;
log_dbg("Creating fake (cipher_null) header for %s device.",
(rc->reencrypt_mode == DECRYPT) ? "new" : "original");
header_file_fake = (rc->reencrypt_mode == DECRYPT) ? rc->header_file_new : rc->header_file_org;
if (!opt_key_size)
opt_key_size = DEFAULT_LUKS1_KEYBITS;
if (opt_cipher) {
r = crypt_parse_name_and_mode(opt_cipher, cipher, NULL, cipher_mode);
if (r < 0) {
log_err(_("No known cipher specification pattern detected.\n"));
goto out;
}
}
r = create_empty_header(header_file_fake, NULL, MAX_BCK_SECTORS);
if (r < 0)
return r;
params.hash = opt_hash ?: DEFAULT_LUKS1_HASH;
params.data_alignment = 0;
params.data_device = rc->device;
r = crypt_init(&cd_new, header_file_fake);
if (r < 0)
return r;
r = crypt_format(cd_new, CRYPT_LUKS1, "cipher_null", "ecb",
NO_UUID, NULL, opt_key_size / 8, &params);
if (r < 0)
goto out;
r = crypt_keyslot_add_by_volume_key(cd_new, rc->keyslot, NULL, 0,
rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen);
if (r < 0)
goto out;
/* The real header is backup header created in backup_luks_headers() */
if (rc->reencrypt_mode == DECRYPT)
goto out;
r = create_empty_header(rc->header_file_new, rc->header_file_org, 0);
if (r < 0)
goto out;
params.data_alignment = ROUND_SECTOR(opt_reduce_size);
r = create_new_header(rc,
opt_cipher ? cipher : DEFAULT_LUKS1_CIPHER,
opt_cipher ? cipher_mode : DEFAULT_LUKS1_MODE,
NULL, NULL,
(opt_key_size ? opt_key_size : DEFAULT_LUKS1_KEYBITS) / 8,
&params);
out:
crypt_free(cd_new);
return r;
}
static void remove_headers(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL;
log_dbg("Removing headers.");
if (crypt_init(&cd, NULL))
return;
crypt_set_log_callback(cd, _quiet_log, NULL);
if (*rc->header_file_org)
(void)crypt_deactivate(cd, rc->header_file_org);
if (*rc->header_file_new)
(void)crypt_deactivate(cd, rc->header_file_new);
crypt_free(cd);
}
static int restore_luks_header(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL;
int r;
log_dbg("Restoring header for %s from %s.", rc->device, rc->header_file_new);
r = crypt_init(&cd, rc->device);
if (r == 0) {
crypt_set_confirm_callback(cd, NULL, NULL);
r = crypt_header_restore(cd, CRYPT_LUKS1, rc->header_file_new);
}
crypt_free(cd);
if (r)
log_err(_("Cannot restore LUKS header on device %s.\n"), rc->device);
else
log_verbose(_("LUKS header on device %s restored.\n"), rc->device);
return r;
}
static void print_progress(struct reenc_ctx *rc, uint64_t bytes, int final)
{
unsigned long long mbytes, eta;
struct timeval now_time;
double tdiff, mib;
gettimeofday(&now_time, NULL);
if (!final && time_diff(rc->end_time, now_time) < 0.5)
return;
rc->end_time = now_time;
if (opt_batch_mode)
return;
tdiff = time_diff(rc->start_time, rc->end_time);
if (!tdiff)
return;
mbytes = (bytes - rc->resume_bytes) / 1024 / 1024;
mib = (double)(mbytes) / tdiff;
if (!mib)
return;
/* FIXME: calculate this from last minute only and remaining space */
eta = (unsigned long long)(rc->device_size / 1024 / 1024 / mib - tdiff);
/* vt100 code clear line */
log_err("\33[2K\r");
log_err(_("Progress: %5.1f%%, ETA %02llu:%02llu, "
"%4llu MiB written, speed %5.1f MiB/s%s"),
(double)bytes / rc->device_size * 100,
eta / 60, eta % 60, mbytes, mib,
final ? "\n" :"");
}
static ssize_t read_buf(int fd, void *buf, size_t count)
{
size_t read_size = 0;
ssize_t s;
do {
/* This expects that partial read is aligned in buffer */
s = read(fd, buf, count - read_size);
if (s == -1 && errno != EINTR)
return s;
if (s == 0)
return (ssize_t)read_size;
if (s > 0) {
if (s != (ssize_t)count)
log_dbg("Partial read %zd / %zu.", s, count);
read_size += (size_t)s;
buf = (uint8_t*)buf + s;
}
} while (read_size != count);
return (ssize_t)count;
}
static int copy_data_forward(struct reenc_ctx *rc, int fd_old, int fd_new,
size_t block_size, void *buf, uint64_t *bytes)
{
ssize_t s1, s2;
log_dbg("Reencrypting in forward direction.");
if (lseek64(fd_old, rc->device_offset, SEEK_SET) < 0 ||
lseek64(fd_new, rc->device_offset, SEEK_SET) < 0) {
log_err(_("Cannot seek to device offset.\n"));
return -EIO;
}
rc->resume_bytes = *bytes = rc->device_offset;
if (write_log(rc) < 0)
return -EIO;
while (!quit && rc->device_offset < rc->device_size) {
s1 = read_buf(fd_old, buf, block_size);
if (s1 < 0 || ((size_t)s1 != block_size &&
(rc->device_offset + s1) != rc->device_size)) {
log_dbg("Read error, expecting %zu, got %zd.",
block_size, s1);
return -EIO;
}
/* If device_size is forced, never write more than limit */
if ((s1 + rc->device_offset) > rc->device_size)
s1 = rc->device_size - rc->device_offset;
s2 = write(fd_new, buf, s1);
if (s2 < 0) {
log_dbg("Write error, expecting %zu, got %zd.",
block_size, s2);
return -EIO;
}
rc->device_offset += s1;
if (opt_write_log && write_log(rc) < 0)
return -EIO;
if (opt_fsync && fsync(fd_new) < 0) {
log_dbg("Write error, fsync.");
return -EIO;
}
*bytes += (uint64_t)s2;
print_progress(rc, *bytes, 0);
}
return quit ? -EAGAIN : 0;
}
static int copy_data_backward(struct reenc_ctx *rc, int fd_old, int fd_new,
size_t block_size, void *buf, uint64_t *bytes)
{
ssize_t s1, s2, working_block;
off64_t working_offset;
log_dbg("Reencrypting in backward direction.");
if (!rc->in_progress) {
rc->device_offset = rc->device_size;
rc->resume_bytes = 0;
*bytes = 0;
} else {
rc->resume_bytes = rc->device_size - rc->device_offset;
*bytes = rc->resume_bytes;
}
if (write_log(rc) < 0)
return -EIO;
while (!quit && rc->device_offset) {
if (rc->device_offset < block_size) {
working_offset = 0;
working_block = rc->device_offset;
} else {
working_offset = rc->device_offset - block_size;
working_block = block_size;
}
if (lseek64(fd_old, working_offset, SEEK_SET) < 0 ||
lseek64(fd_new, working_offset, SEEK_SET) < 0) {
log_err(_("Cannot seek to device offset.\n"));
return -EIO;
}
s1 = read_buf(fd_old, buf, working_block);
if (s1 < 0 || (s1 != working_block)) {
log_dbg("Read error, expecting %zu, got %zd.",
block_size, s1);
return -EIO;
}
s2 = write(fd_new, buf, working_block);
if (s2 < 0) {
log_dbg("Write error, expecting %zu, got %zd.",
block_size, s2);
return -EIO;
}
rc->device_offset -= s1;
if (opt_write_log && write_log(rc) < 0)
return -EIO;
if (opt_fsync && fsync(fd_new) < 0) {
log_dbg("Write error, fsync.");
return -EIO;
}
*bytes += (uint64_t)s2;
print_progress(rc, *bytes, 0);
}
return quit ? -EAGAIN : 0;
}
static void zero_rest_of_device(int fd, size_t block_size, void *buf,
uint64_t *bytes, uint64_t offset)
{
ssize_t s1, s2;
log_dbg("Zeroing rest of device.");
if (lseek64(fd, offset, SEEK_SET) < 0) {
log_dbg(_("Cannot seek to device offset.\n"));
return;
}
memset(buf, 0, block_size);
s1 = block_size;
while (!quit && *bytes) {
if (*bytes < s1)
s1 = *bytes;
s2 = write(fd, buf, s1);
if (s2 < 0) {
log_dbg("Write error, expecting %zu, got %zd.",
block_size, s2);
return;
}
if (opt_fsync && fsync(fd) < 0) {
log_dbg("Write error, fsync.");
return;
}
*bytes -= s2;
}
}
static int copy_data(struct reenc_ctx *rc)
{
size_t block_size = opt_bsize * 1024 * 1024;
int fd_old = -1, fd_new = -1;
int r = -EINVAL;
void *buf = NULL;
uint64_t bytes = 0;
log_dbg("Data copy preparation.");
fd_old = open(rc->crypt_path_org, O_RDONLY | (opt_directio ? O_DIRECT : 0));
if (fd_old == -1) {
log_err(_("Cannot open temporary LUKS header file.\n"));
goto out;
}
fd_new = open(rc->crypt_path_new, O_WRONLY | (opt_directio ? O_DIRECT : 0));
if (fd_new == -1) {
log_err(_("Cannot open temporary LUKS header file.\n"));
goto out;
}
if (ioctl(fd_old, BLKGETSIZE64, &rc->device_size_org_real) < 0) {
log_err(_("Cannot get device size.\n"));
goto out;
}
if (ioctl(fd_new, BLKGETSIZE64, &rc->device_size_new_real) < 0) {
log_err(_("Cannot get device size.\n"));
goto out;
}
if (opt_device_size)
rc->device_size = opt_device_size;
else if (rc->reencrypt_mode == DECRYPT)
rc->device_size = rc->device_size_org_real;
else
rc->device_size = rc->device_size_new_real;
if (posix_memalign((void *)&buf, alignment(fd_new), block_size)) {
log_err(_("Allocation of aligned memory failed.\n"));
r = -ENOMEM;
goto out;
}
set_int_handler(0);
gettimeofday(&rc->start_time, NULL);
if (rc->reencrypt_direction == FORWARD)
r = copy_data_forward(rc, fd_old, fd_new, block_size, buf, &bytes);
else
r = copy_data_backward(rc, fd_old, fd_new, block_size, buf, &bytes);
print_progress(rc, bytes, 1);
/* Zero (wipe) rest of now plain-only device when decrypting.
* (To not leave any sign of encryption here.) */
if (!r && rc->reencrypt_mode == DECRYPT &&
rc->device_size_new_real > rc->device_size_org_real) {
bytes = rc->device_size_new_real - rc->device_size_org_real;
zero_rest_of_device(fd_new, block_size, buf, &bytes, rc->device_size_org_real);
}
set_int_block(1);
if (r == -EAGAIN)
log_err(_("Interrupted by a signal.\n"));
else if (r < 0)
log_err(_("IO error during reencryption.\n"));
(void)write_log(rc);
out:
if (fd_old != -1)
close(fd_old);
if (fd_new != -1)
close(fd_new);
free(buf);
return r;
}
static int initialize_uuid(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL;
int r;
log_dbg("Initialising UUID.");
if (opt_new) {
rc->device_uuid = strdup(NO_UUID);
return 0;
}
/* Try to load LUKS from device */
if ((r = crypt_init(&cd, rc->device)))
return r;
crypt_set_log_callback(cd, _quiet_log, NULL);
r = crypt_load(cd, CRYPT_LUKS1, NULL);
if (!r)
rc->device_uuid = strdup(crypt_get_uuid(cd));
else
/* Reencryption already in progress - magic header? */
r = device_check(rc, CHECK_UNUSABLE);
crypt_free(cd);
return r;
}
static int init_passphrase1(struct reenc_ctx *rc, struct crypt_device *cd,
const char *msg, int slot_to_check, int check)
{
char *password;
int r = -EINVAL, retry_count;
size_t passwordLen;
retry_count = opt_tries ?: 1;
while (retry_count--) {
set_int_handler(0);
r = crypt_get_key(msg, &password, &passwordLen,
0, 0, NULL /*opt_key_file*/,
0, 0, cd);
if (r < 0)
return r;
if (quit)
return -EAGAIN;
/* library uses sigint internally, until it is fixed...*/
set_int_block(1);
if (check)
r = crypt_activate_by_passphrase(cd, NULL, slot_to_check,
password, passwordLen, 0);
else
r = (slot_to_check == CRYPT_ANY_SLOT) ? 0 : slot_to_check;
if (r < 0) {
crypt_safe_free(password);
password = NULL;
passwordLen = 0;
}
if (r < 0 && r != -EPERM)
return r;
if (r >= 0) {
rc->keyslot = r;
rc->p[r].password = password;
rc->p[r].passwordLen = passwordLen;
break;
}
log_err(_("No key available with this passphrase.\n"));
}
password = NULL;
passwordLen = 0;
return r;
}
static int init_keyfile(struct reenc_ctx *rc, struct crypt_device *cd, int slot_check)
{
char *password;
int r;
size_t passwordLen;
r = crypt_get_key(NULL, &password, &passwordLen, opt_keyfile_offset,
opt_keyfile_size, opt_key_file, 0, 0, cd);
if (r < 0)
return r;
r = crypt_activate_by_passphrase(cd, NULL, slot_check, password,
passwordLen, 0);
/*
* Allow keyslot only if it is last slot or if user explicitly
* specify which slot to use (IOW others will be disabled).
*/
if (r >= 0 && opt_key_slot == CRYPT_ANY_SLOT &&
crypt_keyslot_status(cd, r) != CRYPT_SLOT_ACTIVE_LAST) {
log_err(_("Key file can be used only with --key-slot or with "
"exactly one key slot active.\n"));
r = -EINVAL;
}
if (r < 0) {
crypt_safe_free(password);
if (r == -EPERM)
log_err(_("No key available with this passphrase.\n"));
} else {
rc->keyslot = r;
rc->p[r].password = password;
rc->p[r].passwordLen = passwordLen;
}
password = NULL;
passwordLen = 0;
return r;
}
static int initialize_passphrase(struct reenc_ctx *rc, const char *device)
{
struct crypt_device *cd = NULL;
crypt_keyslot_info ki;
char msg[256];
int i, r;
log_dbg("Passhrases initialization.");
if (rc->reencrypt_mode == ENCRYPT && !rc->in_progress) {
r = init_passphrase1(rc, cd, _("Enter new passphrase: "), opt_key_slot, 0);
return r > 0 ? 0 : r;
}
if ((r = crypt_init(&cd, device)) ||
(r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
(r = crypt_set_data_device(cd, rc->device))) {
crypt_free(cd);
return r;
}
if (opt_key_slot != CRYPT_ANY_SLOT)
snprintf(msg, sizeof(msg),
_("Enter passphrase for key slot %u: "), opt_key_slot);
else
snprintf(msg, sizeof(msg), _("Enter any existing passphrase: "));
if (opt_key_file) {
r = init_keyfile(rc, cd, opt_key_slot);
} else if (rc->in_progress ||
opt_key_slot != CRYPT_ANY_SLOT ||
rc->reencrypt_mode == DECRYPT) {
r = init_passphrase1(rc, cd, msg, opt_key_slot, 1);
} else for (i = 0; i < MAX_SLOT; i++) {
ki = crypt_keyslot_status(cd, i);
if (ki != CRYPT_SLOT_ACTIVE && ki != CRYPT_SLOT_ACTIVE_LAST)
continue;
snprintf(msg, sizeof(msg), _("Enter passphrase for key slot %u: "), i);
r = init_passphrase1(rc, cd, msg, i, 1);
if (r < 0)
break;
}
crypt_free(cd);
return r > 0 ? 0 : r;
}
static int initialize_context(struct reenc_ctx *rc, const char *device)
{
log_dbg("Initialising reencryption context.");
rc->log_fd =-1;
if (!(rc->device = strndup(device, PATH_MAX)))
return -ENOMEM;
if (device_check(rc, CHECK_OPEN) < 0)
return -EINVAL;
if (initialize_uuid(rc)) {
log_err(_("Device %s is not a valid LUKS device.\n"), device);
return -EINVAL;
}
/* Prepare device names */
if (snprintf(rc->log_file, PATH_MAX,
"LUKS-%s.log", rc->device_uuid) < 0)
return -ENOMEM;
if (snprintf(rc->header_file_org, PATH_MAX,
"LUKS-%s.org", rc->device_uuid) < 0)
return -ENOMEM;
if (snprintf(rc->header_file_new, PATH_MAX,
"LUKS-%s.new", rc->device_uuid) < 0)
return -ENOMEM;
/* Paths to encrypted devices */
if (snprintf(rc->crypt_path_org, PATH_MAX,
"%s/%s", crypt_get_dir(), rc->header_file_org) < 0)
return -ENOMEM;
if (snprintf(rc->crypt_path_new, PATH_MAX,
"%s/%s", crypt_get_dir(), rc->header_file_new) < 0)
return -ENOMEM;
remove_headers(rc);
if (open_log(rc) < 0) {
log_err(_("Cannot open reencryption log file.\n"));
return -EINVAL;
}
if (!rc->in_progress) {
if (!opt_reduce_size)
rc->reencrypt_direction = FORWARD;
else {
rc->reencrypt_direction = BACKWARD;
rc->device_offset = (uint64_t)~0;
}
if (opt_new)
rc->reencrypt_mode = ENCRYPT;
else if (opt_decrypt)
rc->reencrypt_mode = DECRYPT;
else
rc->reencrypt_mode = REENCRYPT;
}
return 0;
}
static void destroy_context(struct reenc_ctx *rc)
{
int i;
log_dbg("Destroying reencryption context.");
close_log(rc);
remove_headers(rc);
if ((rc->reencrypt_direction == FORWARD &&
rc->device_offset == rc->device_size) ||
(rc->reencrypt_direction == BACKWARD &&
(rc->device_offset == 0 || rc->device_offset == (uint64_t)~0))) {
unlink(rc->log_file);
unlink(rc->header_file_org);
unlink(rc->header_file_new);
}
for (i = 0; i < MAX_SLOT; i++)
crypt_safe_free(rc->p[i].password);
free(rc->device);
free(rc->device_uuid);
}
static int run_reencrypt(const char *device)
{
int r = -EINVAL;
static struct reenc_ctx rc = {};
if (initialize_context(&rc, device))
goto out;
log_dbg("Running reencryption.");
if (!rc.in_progress) {
if ((r = initialize_passphrase(&rc, rc.device)))
goto out;
if (rc.reencrypt_mode == ENCRYPT) {
/* Create fake header for exising device */
if ((r = backup_fake_header(&rc)))
goto out;
} else {
if ((r = backup_luks_headers(&rc)))
goto out;
/* Create fake header for decrypted device */
if (rc.reencrypt_mode == DECRYPT &&
(r = backup_fake_header(&rc)))
goto out;
if ((r = device_check(&rc, MAKE_UNUSABLE)))
goto out;
}
} else {
if ((r = initialize_passphrase(&rc, rc.header_file_new)))
goto out;
}
if (!opt_keep_key) {
log_dbg("Running data area reencryption.");
if ((r = activate_luks_headers(&rc)))
goto out;
if ((r = copy_data(&rc)))
goto out;
} else
log_dbg("Keeping existing key, skipping data area reencryption.");
// FIXME: fix error path above to not skip this
if (rc.reencrypt_mode != DECRYPT)
r = restore_luks_header(&rc);
out:
destroy_context(&rc);
return r;
}
static void help(poptContext popt_context,
enum poptCallbackReason reason __attribute__((unused)),
struct poptOption *key,
const char *arg __attribute__((unused)),
void *data __attribute__((unused)))
{
if (key->shortName == '?') {
log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
poptPrintHelp(popt_context, stdout, 0);
exit(EXIT_SUCCESS);
} else
usage(popt_context, EXIT_SUCCESS, NULL, NULL);
}
int main(int argc, const char **argv)
{
static struct poptOption popt_help_options[] = {
{ NULL, '\0', POPT_ARG_CALLBACK, help, 0, NULL, NULL },
{ "help", '?', POPT_ARG_NONE, NULL, 0, N_("Show this help message"), NULL },
{ "usage", '\0', POPT_ARG_NONE, NULL, 0, N_("Display brief usage"), NULL },
POPT_TABLEEND
};
static struct poptOption popt_options[] = {
{ NULL, '\0', POPT_ARG_INCLUDE_TABLE, popt_help_options, 0, N_("Help options:"), NULL },
{ "version", '\0', POPT_ARG_NONE, &opt_version_mode, 0, N_("Print package version"), NULL },
{ "verbose", 'v', POPT_ARG_NONE, &opt_verbose, 0, N_("Shows more detailed error messages"), NULL },
{ "debug", '\0', POPT_ARG_NONE, &opt_debug, 0, N_("Show debug messages"), NULL },
{ "block-size", 'B', POPT_ARG_INT, &opt_bsize, 0, N_("Reencryption block size"), N_("MiB") },
{ "cipher", 'c', POPT_ARG_STRING, &opt_cipher, 0, N_("The cipher used to encrypt the disk (see /proc/crypto)"), NULL },
{ "key-size", 's', POPT_ARG_INT, &opt_key_size, 0, N_("The size of the encryption key"), N_("BITS") },
{ "hash", 'h', POPT_ARG_STRING, &opt_hash, 0, N_("The hash used to create the encryption key from the passphrase"), NULL },
{ "keep-key", '\0', POPT_ARG_NONE, &opt_keep_key, 0, N_("Do not change key, no data area reencryption."), NULL },
{ "key-file", 'd', POPT_ARG_STRING, &opt_key_file, 0, N_("Read the key from a file."), NULL },
{ "iter-time", 'i', POPT_ARG_INT, &opt_iteration_time, 0, N_("PBKDF2 iteration time for LUKS (in ms)"), N_("msecs") },
{ "batch-mode", 'q', POPT_ARG_NONE, &opt_batch_mode, 0, N_("Do not ask for confirmation"), NULL },
{ "tries", 'T', POPT_ARG_INT, &opt_tries, 0, N_("How often the input of the passphrase can be retried"), NULL },
{ "use-random", '\0', POPT_ARG_NONE, &opt_random, 0, N_("Use /dev/random for generating volume key."), NULL },
{ "use-urandom", '\0', POPT_ARG_NONE, &opt_urandom, 0, N_("Use /dev/urandom for generating volume key."), NULL },
{ "use-directio", '\0', POPT_ARG_NONE, &opt_directio, 0, N_("Use direct-io when accessing devices."), NULL },
{ "use-fsync", '\0', POPT_ARG_NONE, &opt_fsync, 0, N_("Use fsync after each block."), NULL },
{ "write-log", '\0', POPT_ARG_NONE, &opt_write_log, 0, N_("Update log file after every block."), NULL },
{ "key-slot", 'S', POPT_ARG_INT, &opt_key_slot, 0, N_("Use only this slot (others will be disabled)."), NULL },
{ "keyfile-offset", '\0', POPT_ARG_LONG, &opt_keyfile_offset, 0, N_("Number of bytes to skip in keyfile"), N_("bytes") },
{ "keyfile-size", 'l', POPT_ARG_LONG, &opt_keyfile_size, 0, N_("Limits the read from keyfile"), N_("bytes") },
{ "reduce-device-size",'\0', POPT_ARG_STRING, &opt_reduce_size_str, 0, N_("Reduce data device size (move data offset). DANGEROUS!"), N_("bytes") },
{ "device-size", '\0', POPT_ARG_STRING, &opt_device_size_str, 0, N_("Use only specified device size (ignore rest of device). DANGEROUS!"), N_("bytes") },
{ "new", 'N', POPT_ARG_NONE, &opt_new, 0, N_("Create new header on not encrypted device."), NULL },
{ "decrypt", '\0', POPT_ARG_NONE, &opt_decrypt, 0, N_("Permanently decrypt device (remove encryption)."), NULL },
POPT_TABLEEND
};
poptContext popt_context;
int r;
crypt_set_log_callback(NULL, tool_log, NULL);
set_int_block(1);
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
popt_context = poptGetContext(PACKAGE, argc, argv, popt_options, 0);
poptSetOtherOptionHelp(popt_context,
_("[OPTION...] <device>"));
while((r = poptGetNextOpt(popt_context)) > 0) ;
if (r < -1)
usage(popt_context, EXIT_FAILURE, poptStrerror(r),
poptBadOption(popt_context, POPT_BADOPTION_NOALIAS));
if (opt_version_mode) {
log_std("%s %s\n", PACKAGE_REENC, PACKAGE_VERSION);
poptFreeContext(popt_context);
exit(EXIT_SUCCESS);
}
if (!opt_batch_mode) {
log_std(_("WARNING: this is experimental code, it can completely break your data.\n"));
log_verbose(_("Reencryption will change: volume key%s%s%s%s.\n"),
opt_hash ? _(", set hash to ") : "", opt_hash ?: "",
opt_cipher ? _(", set cipher to "): "", opt_cipher ?: "");
}
action_argv = poptGetArgs(popt_context);
if(!action_argv)
usage(popt_context, EXIT_FAILURE, _("Argument required."),
poptGetInvocationName(popt_context));
if (opt_random && opt_urandom)
usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
poptGetInvocationName(popt_context));
if (opt_bsize < 0 || opt_key_size < 0 || opt_iteration_time < 0 ||
opt_tries < 0 || opt_keyfile_offset < 0 || opt_key_size < 0) {
usage(popt_context, EXIT_FAILURE,
_("Negative number for option not permitted."),
poptGetInvocationName(popt_context));
}
if (opt_bsize < 1 || opt_bsize > 64)
usage(popt_context, EXIT_FAILURE,
_("Only values between 1 MiB and 64 MiB allowed for reencryption block size."),
poptGetInvocationName(popt_context));
if (opt_key_size % 8)
usage(popt_context, EXIT_FAILURE,
_("Key size must be a multiple of 8 bits"),
poptGetInvocationName(popt_context));
if (opt_key_slot != CRYPT_ANY_SLOT &&
(opt_key_slot < 0 || opt_key_slot >= crypt_keyslot_max(CRYPT_LUKS1)))
usage(popt_context, EXIT_FAILURE, _("Key slot is invalid."),
poptGetInvocationName(popt_context));
if (opt_random && opt_urandom)
usage(popt_context, EXIT_FAILURE, _("Only one of --use-[u]random options is allowed."),
poptGetInvocationName(popt_context));
if (opt_device_size_str &&
tools_string_to_size(NULL, opt_device_size_str, &opt_device_size))
usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
poptGetInvocationName(popt_context));
if (opt_reduce_size_str &&
tools_string_to_size(NULL, opt_reduce_size_str, &opt_reduce_size))
usage(popt_context, EXIT_FAILURE, _("Invalid device size specification."),
poptGetInvocationName(popt_context));
if (opt_reduce_size > 64 * 1024 * 1024)
usage(popt_context, EXIT_FAILURE, _("Maximum device reduce size is 64 MiB."),
poptGetInvocationName(popt_context));
if (opt_reduce_size % SECTOR_SIZE)
usage(popt_context, EXIT_FAILURE, _("Reduce size must be multiple of 512 bytes sector."),
poptGetInvocationName(popt_context));
if (opt_new && !opt_reduce_size)
usage(popt_context, EXIT_FAILURE, _("Option --new must be used together with --reduce-device-size."),
poptGetInvocationName(popt_context));
if (opt_keep_key && ((!opt_hash && !opt_iteration_time) || opt_cipher || opt_new))
usage(popt_context, EXIT_FAILURE, _("Option --keep-key can be used only with --hash or --iter-time."),
poptGetInvocationName(popt_context));
if (opt_new && opt_decrypt)
usage(popt_context, EXIT_FAILURE, _("Option --new cannot be used together with --decrypt."),
poptGetInvocationName(popt_context));
if (opt_decrypt && (opt_cipher || opt_hash || opt_reduce_size || opt_keep_key || opt_device_size))
usage(popt_context, EXIT_FAILURE, _("Option --decrypt is incompatible with specified parameters."),
poptGetInvocationName(popt_context));
if (opt_debug) {
opt_verbose = 1;
crypt_set_debug_level(-1);
dbg_version_and_cmd(argc, argv);
}
r = run_reencrypt(action_argv[0]);
poptFreeContext(popt_context);
return translate_errno(r);
}
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