/*
* LUKS - Linux Unified Key Setup v2, LUKS1 conversion code
*
* Copyright (C) 2015-2020 Red Hat, Inc. All rights reserved.
* Copyright (C) 2015-2020 Ondrej Kozina
* Copyright (C) 2015-2020 Milan Broz
*
* 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 "luks2_internal.h"
#include "../luks1/luks.h"
#include "../luks1/af.h"
int LUKS2_check_cipher(struct crypt_device *cd,
size_t keylength,
const char *cipher,
const char *cipher_mode)
{
return LUKS_check_cipher(cd, keylength, cipher, cipher_mode);
}
static int json_luks1_keyslot(const struct luks_phdr *hdr_v1, int keyslot, struct json_object **keyslot_object)
{
char *base64_str, cipher[LUKS_CIPHERNAME_L+LUKS_CIPHERMODE_L];
size_t base64_len;
struct json_object *keyslot_obj, *field, *jobj_kdf, *jobj_af, *jobj_area;
uint64_t offset, area_size, offs_a, offs_b, length;
keyslot_obj = json_object_new_object();
json_object_object_add(keyslot_obj, "type", json_object_new_string("luks2"));
json_object_object_add(keyslot_obj, "key_size", json_object_new_int64(hdr_v1->keyBytes));
/* KDF */
jobj_kdf = json_object_new_object();
json_object_object_add(jobj_kdf, "type", json_object_new_string(CRYPT_KDF_PBKDF2));
json_object_object_add(jobj_kdf, "hash", json_object_new_string(hdr_v1->hashSpec));
json_object_object_add(jobj_kdf, "iterations", json_object_new_int64(hdr_v1->keyblock[keyslot].passwordIterations));
/* salt field */
base64_len = base64_encode_alloc(hdr_v1->keyblock[keyslot].passwordSalt, LUKS_SALTSIZE, &base64_str);
if (!base64_str) {
json_object_put(keyslot_obj);
json_object_put(jobj_kdf);
if (!base64_len)
return -EINVAL;
return -ENOMEM;
}
field = json_object_new_string_len(base64_str, base64_len);
free(base64_str);
json_object_object_add(jobj_kdf, "salt", field);
json_object_object_add(keyslot_obj, "kdf", jobj_kdf);
/* AF */
jobj_af = json_object_new_object();
json_object_object_add(jobj_af, "type", json_object_new_string("luks1"));
json_object_object_add(jobj_af, "hash", json_object_new_string(hdr_v1->hashSpec));
/* stripes field ignored, fixed to LUKS_STRIPES (4000) */
json_object_object_add(jobj_af, "stripes", json_object_new_int(4000));
json_object_object_add(keyslot_obj, "af", jobj_af);
/* Area */
jobj_area = json_object_new_object();
json_object_object_add(jobj_area, "type", json_object_new_string("raw"));
/* encryption algorithm field */
if (*hdr_v1->cipherMode != '\0') {
(void) snprintf(cipher, sizeof(cipher), "%s-%s", hdr_v1->cipherName, hdr_v1->cipherMode);
json_object_object_add(jobj_area, "encryption", json_object_new_string(cipher));
} else
json_object_object_add(jobj_area, "encryption", json_object_new_string(hdr_v1->cipherName));
/* area */
if (LUKS_keyslot_area(hdr_v1, 0, &offs_a, &length) ||
LUKS_keyslot_area(hdr_v1, 1, &offs_b, &length) ||
LUKS_keyslot_area(hdr_v1, keyslot, &offset, &length)) {
json_object_put(keyslot_obj);
json_object_put(jobj_area);
return -EINVAL;
}
area_size = offs_b - offs_a;
json_object_object_add(jobj_area, "key_size", json_object_new_int(hdr_v1->keyBytes));
json_object_object_add(jobj_area, "offset", crypt_jobj_new_uint64(offset));
json_object_object_add(jobj_area, "size", crypt_jobj_new_uint64(area_size));
json_object_object_add(keyslot_obj, "area", jobj_area);
*keyslot_object = keyslot_obj;
return 0;
}
static int json_luks1_keyslots(const struct luks_phdr *hdr_v1, struct json_object **keyslots_object)
{
int keyslot, r;
struct json_object *keyslot_obj, *field;
keyslot_obj = json_object_new_object();
if (!keyslot_obj)
return -ENOMEM;
for (keyslot = 0; keyslot < LUKS_NUMKEYS; keyslot++) {
if (hdr_v1->keyblock[keyslot].active != LUKS_KEY_ENABLED)
continue;
r = json_luks1_keyslot(hdr_v1, keyslot, &field);
if (r) {
json_object_put(keyslot_obj);
return r;
}
json_object_object_add_by_uint(keyslot_obj, keyslot, field);
}
*keyslots_object = keyslot_obj;
return 0;
}
static int json_luks1_segment(const struct luks_phdr *hdr_v1, struct json_object **segment_object)
{
const char *c;
char cipher[LUKS_CIPHERNAME_L+LUKS_CIPHERMODE_L];
struct json_object *segment_obj, *field;
uint64_t number;
segment_obj = json_object_new_object();
if (!segment_obj)
return -ENOMEM;
/* type field */
field = json_object_new_string("crypt");
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "type", field);
/* offset field */
number = (uint64_t)hdr_v1->payloadOffset * SECTOR_SIZE;
field = crypt_jobj_new_uint64(number);
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "offset", field);
/* iv_tweak field */
field = json_object_new_string("0");
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "iv_tweak", field);
/* length field */
field = json_object_new_string("dynamic");
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "size", field);
/* cipher field */
if (*hdr_v1->cipherMode != '\0') {
(void) snprintf(cipher, sizeof(cipher), "%s-%s", hdr_v1->cipherName, hdr_v1->cipherMode);
c = cipher;
} else
c = hdr_v1->cipherName;
field = json_object_new_string(c);
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "encryption", field);
/* block field */
field = json_object_new_int(SECTOR_SIZE);
if (!field) {
json_object_put(segment_obj);
return -ENOMEM;
}
json_object_object_add(segment_obj, "sector_size", field);
*segment_object = segment_obj;
return 0;
}
static int json_luks1_segments(const struct luks_phdr *hdr_v1, struct json_object **segments_object)
{
int r;
struct json_object *segments_obj, *field;
segments_obj = json_object_new_object();
if (!segments_obj)
return -ENOMEM;
r = json_luks1_segment(hdr_v1, &field);
if (r) {
json_object_put(segments_obj);
return r;
}
json_object_object_add_by_uint(segments_obj, 0, field);
*segments_object = segments_obj;
return 0;
}
static int json_luks1_digest(const struct luks_phdr *hdr_v1, struct json_object **digest_object)
{
char keyslot_str[2], *base64_str;
int ks;
size_t base64_len;
struct json_object *digest_obj, *array, *field;
digest_obj = json_object_new_object();
if (!digest_obj)
return -ENOMEM;
/* type field */
field = json_object_new_string("pbkdf2");
if (!field) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "type", field);
/* keyslots array */
array = json_object_new_array();
if (!array) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "keyslots", json_object_get(array));
for (ks = 0; ks < LUKS_NUMKEYS; ks++) {
if (hdr_v1->keyblock[ks].active != LUKS_KEY_ENABLED)
continue;
(void) snprintf(keyslot_str, sizeof(keyslot_str), "%d", ks);
field = json_object_new_string(keyslot_str);
if (!field || json_object_array_add(array, field) < 0) {
json_object_put(field);
json_object_put(array);
json_object_put(digest_obj);
return -ENOMEM;
}
}
json_object_put(array);
/* segments array */
array = json_object_new_array();
if (!array) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "segments", json_object_get(array));
field = json_object_new_string("0");
if (!field || json_object_array_add(array, field) < 0) {
json_object_put(field);
json_object_put(array);
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_put(array);
/* hash field */
field = json_object_new_string(hdr_v1->hashSpec);
if (!field) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "hash", field);
/* salt field */
base64_len = base64_encode_alloc(hdr_v1->mkDigestSalt, LUKS_SALTSIZE, &base64_str);
if (!base64_str) {
json_object_put(digest_obj);
if (!base64_len)
return -EINVAL;
return -ENOMEM;
}
field = json_object_new_string_len(base64_str, base64_len);
free(base64_str);
if (!field) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "salt", field);
/* digest field */
base64_len = base64_encode_alloc(hdr_v1->mkDigest, LUKS_DIGESTSIZE, &base64_str);
if (!base64_str) {
json_object_put(digest_obj);
if (!base64_len)
return -EINVAL;
return -ENOMEM;
}
field = json_object_new_string_len(base64_str, base64_len);
free(base64_str);
if (!field) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "digest", field);
/* iterations field */
field = json_object_new_int64(hdr_v1->mkDigestIterations);
if (!field) {
json_object_put(digest_obj);
return -ENOMEM;
}
json_object_object_add(digest_obj, "iterations", field);
*digest_object = digest_obj;
return 0;
}
static int json_luks1_digests(const struct luks_phdr *hdr_v1, struct json_object **digests_object)
{
int r;
struct json_object *digests_obj, *field;
digests_obj = json_object_new_object();
if (!digests_obj)
return -ENOMEM;
r = json_luks1_digest(hdr_v1, &field);
if (r) {
json_object_put(digests_obj);
return r;
}
json_object_object_add(digests_obj, "0", field);
*digests_object = digests_obj;
return 0;
}
static int json_luks1_object(struct luks_phdr *hdr_v1, struct json_object **luks1_object, uint64_t keyslots_size)
{
int r;
struct json_object *luks1_obj, *field;
uint64_t json_size;
luks1_obj = json_object_new_object();
if (!luks1_obj)
return -ENOMEM;
/* keyslots field */
r = json_luks1_keyslots(hdr_v1, &field);
if (r) {
json_object_put(luks1_obj);
return r;
}
json_object_object_add(luks1_obj, "keyslots", field);
/* tokens field */
field = json_object_new_object();
if (!field) {
json_object_put(luks1_obj);
return -ENOMEM;
}
json_object_object_add(luks1_obj, "tokens", field);
/* segments field */
r = json_luks1_segments(hdr_v1, &field);
if (r) {
json_object_put(luks1_obj);
return r;
}
json_object_object_add(luks1_obj, "segments", field);
/* digests field */
r = json_luks1_digests(hdr_v1, &field);
if (r) {
json_object_put(luks1_obj);
return r;
}
json_object_object_add(luks1_obj, "digests", field);
/* config field */
/* anything else? */
field = json_object_new_object();
if (!field) {
json_object_put(luks1_obj);
return -ENOMEM;
}
json_object_object_add(luks1_obj, "config", field);
json_size = LUKS2_HDR_16K_LEN - LUKS2_HDR_BIN_LEN;
json_object_object_add(field, "json_size", crypt_jobj_new_uint64(json_size));
keyslots_size -= (keyslots_size % 4096);
json_object_object_add(field, "keyslots_size", crypt_jobj_new_uint64(keyslots_size));
*luks1_object = luks1_obj;
return 0;
}
static void move_keyslot_offset(json_object *jobj, int offset_add)
{
json_object *jobj1, *jobj2, *jobj_area;
uint64_t offset = 0;
json_object_object_get_ex(jobj, "keyslots", &jobj1);
json_object_object_foreach(jobj1, key, val) {
UNUSED(key);
json_object_object_get_ex(val, "area", &jobj_area);
json_object_object_get_ex(jobj_area, "offset", &jobj2);
offset = crypt_jobj_get_uint64(jobj2) + offset_add;
json_object_object_add(jobj_area, "offset", crypt_jobj_new_uint64(offset));
}
}
/* FIXME: return specific error code for partial write error (aka keyslots are gone) */
static int move_keyslot_areas(struct crypt_device *cd, off_t offset_from,
off_t offset_to, size_t buf_size)
{
int devfd, r = -EIO;
struct device *device = crypt_metadata_device(cd);
void *buf = NULL;
log_dbg(cd, "Moving keyslot areas of size %zu from %jd to %jd.",
buf_size, (intmax_t)offset_from, (intmax_t)offset_to);
if (posix_memalign(&buf, crypt_getpagesize(), buf_size))
return -ENOMEM;
devfd = device_open(cd, device, O_RDWR);
if (devfd < 0) {
free(buf);
return -EIO;
}
/* This can safely fail (for block devices). It only allocates space if it is possible. */
if (posix_fallocate(devfd, offset_to, buf_size))
log_dbg(cd, "Preallocation (fallocate) of new keyslot area not available.");
/* Try to read *new* area to check that area is there (trimmed backup). */
if (read_lseek_blockwise(devfd, device_block_size(cd, device),
device_alignment(device), buf, buf_size,
offset_to)!= (ssize_t)buf_size)
goto out;
if (read_lseek_blockwise(devfd, device_block_size(cd, device),
device_alignment(device), buf, buf_size,
offset_from)!= (ssize_t)buf_size)
goto out;
if (write_lseek_blockwise(devfd, device_block_size(cd, device),
device_alignment(device), buf, buf_size,
offset_to) != (ssize_t)buf_size)
goto out;
r = 0;
out:
device_sync(cd, device);
crypt_safe_memzero(buf, buf_size);
free(buf);
return r;
}
static int luks_header_in_use(struct crypt_device *cd)
{
int r;
r = lookup_dm_dev_by_uuid(cd, crypt_get_uuid(cd), crypt_get_type(cd));
if (r < 0)
log_err(cd, _("Cannot check status of device with uuid: %s."), crypt_get_uuid(cd));
return r;
}
/* Check if there is a luksmeta area (foreign metadata created by the luksmeta package) */
static int luksmeta_header_present(struct crypt_device *cd, off_t luks1_size)
{
int devfd, r = 0;
static const uint8_t LM_MAGIC[] = { 'L', 'U', 'K', 'S', 'M', 'E', 'T', 'A' };
struct device *device = crypt_metadata_device(cd);
void *buf = NULL;
if (posix_memalign(&buf, crypt_getpagesize(), sizeof(LM_MAGIC)))
return -ENOMEM;
devfd = device_open(cd, device, O_RDONLY);
if (devfd < 0) {
free(buf);
return -EIO;
}
/* Note: we must not detect failure as problem here, header can be trimmed. */
if (read_lseek_blockwise(devfd, device_block_size(cd, device), device_alignment(device),
buf, sizeof(LM_MAGIC), luks1_size) == (ssize_t)sizeof(LM_MAGIC) &&
!memcmp(LM_MAGIC, buf, sizeof(LM_MAGIC))) {
log_err(cd, _("Unable to convert header with LUKSMETA additional metadata."));
r = -EBUSY;
}
free(buf);
return r;
}
/* Convert LUKS1 -> LUKS2 */
int LUKS2_luks1_to_luks2(struct crypt_device *cd, struct luks_phdr *hdr1, struct luks2_hdr *hdr2)
{
int r;
json_object *jobj = NULL;
size_t buf_size, buf_offset, luks1_size, luks1_shift = 2 * LUKS2_HDR_16K_LEN - LUKS_ALIGN_KEYSLOTS;
uint64_t required_size, max_size = crypt_get_data_offset(cd) * SECTOR_SIZE;
/* for detached headers max size == device size */
if (!max_size && (r = device_size(crypt_metadata_device(cd), &max_size)))
return r;
luks1_size = LUKS_device_sectors(hdr1) << SECTOR_SHIFT;
luks1_size = size_round_up(luks1_size, LUKS_ALIGN_KEYSLOTS);
if (!luks1_size)
return -EINVAL;
if (LUKS_keyslots_offset(hdr1) != (LUKS_ALIGN_KEYSLOTS / SECTOR_SIZE)) {
log_dbg(cd, "Unsupported keyslots material offset: %zu.", LUKS_keyslots_offset(hdr1));
return -EINVAL;
}
if (luksmeta_header_present(cd, luks1_size))
return -EINVAL;
log_dbg(cd, "Max size: %" PRIu64 ", LUKS1 (full) header size %zu , required shift: %zu",
max_size, luks1_size, luks1_shift);
required_size = luks1_size + luks1_shift;
if ((max_size < required_size) &&
device_fallocate(crypt_metadata_device(cd), required_size)) {
log_err(cd, _("Unable to move keyslot area. Not enough space."));
return -EINVAL;
}
if (max_size < required_size)
max_size = required_size;
r = json_luks1_object(hdr1, &jobj, max_size - 2 * LUKS2_HDR_16K_LEN);
if (r < 0)
return r;
move_keyslot_offset(jobj, luks1_shift);
// fill hdr2
memset(hdr2, 0, sizeof(*hdr2));
hdr2->hdr_size = LUKS2_HDR_16K_LEN;
hdr2->seqid = 1;
hdr2->version = 2;
strncpy(hdr2->checksum_alg, "sha256", LUKS2_CHECKSUM_ALG_L);
crypt_random_get(cd, (char*)hdr2->salt1, sizeof(hdr2->salt1), CRYPT_RND_SALT);
crypt_random_get(cd, (char*)hdr2->salt2, sizeof(hdr2->salt2), CRYPT_RND_SALT);
strncpy(hdr2->uuid, crypt_get_uuid(cd), LUKS2_UUID_L-1); /* UUID should be max 36 chars */
hdr2->jobj = jobj;
/*
* It duplicates check in LUKS2_hdr_write() but we don't want to move
* keyslot areas in case it would fail later
*/
if (max_size < LUKS2_hdr_and_areas_size(hdr2->jobj)) {
r = -EINVAL;
goto out;
}
/* check future LUKS2 metadata before moving keyslots area */
if (LUKS2_hdr_validate(cd, hdr2->jobj, hdr2->hdr_size - LUKS2_HDR_BIN_LEN)) {
r = -EINVAL;
goto out;
}
if ((r = luks_header_in_use(cd))) {
if (r > 0)
r = -EBUSY;
goto out;
}
// move keyslots 4k -> 32k offset
buf_offset = 2 * LUKS2_HDR_16K_LEN;
buf_size = luks1_size - LUKS_ALIGN_KEYSLOTS;
/* check future LUKS2 keyslots area is at least as large as LUKS1 keyslots area */
if (buf_size > LUKS2_keyslots_size(hdr2->jobj)) {
log_err(cd, _("Unable to move keyslot area. LUKS2 keyslots area too small."));
r = -EINVAL;
goto out;
}
if ((r = move_keyslot_areas(cd, 8 * SECTOR_SIZE, buf_offset, buf_size)) < 0) {
log_err(cd, _("Unable to move keyslot area."));
goto out;
}
// Write JSON hdr2
r = LUKS2_hdr_write(cd, hdr2);
out:
LUKS2_hdr_free(cd, hdr2);
return r;
}
static int keyslot_LUKS1_compatible(struct crypt_device *cd, struct luks2_hdr *hdr,
int keyslot, uint32_t key_size, const char *hash)
{
json_object *jobj_keyslot, *jobj, *jobj_kdf, *jobj_af;
uint64_t l2_offset, l2_length;
size_t ks_key_size;
const char *ks_cipher, *data_cipher;
jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot);
if (!jobj_keyslot)
return 1;
if (!json_object_object_get_ex(jobj_keyslot, "type", &jobj) ||
strcmp(json_object_get_string(jobj), "luks2"))
return 0;
/* Using PBKDF2, this implies memory and parallel is not used. */
jobj = NULL;
if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf) ||
!json_object_object_get_ex(jobj_kdf, "type", &jobj) ||
strcmp(json_object_get_string(jobj), CRYPT_KDF_PBKDF2) ||
!json_object_object_get_ex(jobj_kdf, "hash", &jobj) ||
strcmp(json_object_get_string(jobj), hash))
return 0;
jobj = NULL;
if (!json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) ||
!json_object_object_get_ex(jobj_af, "stripes", &jobj) ||
json_object_get_int(jobj) != LUKS_STRIPES)
return 0;
jobj = NULL;
if (!json_object_object_get_ex(jobj_af, "hash", &jobj) ||
(crypt_hash_size(json_object_get_string(jobj)) < 0) ||
strcmp(json_object_get_string(jobj), hash))
return 0;
/* FIXME: should this go to validation code instead (aka invalid luks2 header if assigned to segment 0)? */
/* FIXME: check all keyslots are assigned to segment id 0, and segments count == 1 */
ks_cipher = LUKS2_get_keyslot_cipher(hdr, keyslot, &ks_key_size);
data_cipher = LUKS2_get_cipher(hdr, CRYPT_DEFAULT_SEGMENT);
if (!ks_cipher || !data_cipher || key_size != ks_key_size || strcmp(ks_cipher, data_cipher)) {
log_dbg(cd, "Cipher in keyslot %d is different from volume key encryption.", keyslot);
return 0;
}
if (LUKS2_keyslot_area(hdr, keyslot, &l2_offset, &l2_length))
return 0;
if (l2_length != (size_round_up(AF_split_sectors(key_size, LUKS_STRIPES) * SECTOR_SIZE, 4096))) {
log_dbg(cd, "Area length in LUKS2 keyslot (%d) is not compatible with LUKS1", keyslot);
return 0;
}
return 1;
}
/* Convert LUKS2 -> LUKS1 */
int LUKS2_luks2_to_luks1(struct crypt_device *cd, struct luks2_hdr *hdr2, struct luks_phdr *hdr1)
{
size_t buf_size, buf_offset;
char cipher[LUKS_CIPHERNAME_L-1], cipher_mode[LUKS_CIPHERMODE_L-1];
char digest[LUKS_DIGESTSIZE], digest_salt[LUKS_SALTSIZE];
const char *hash;
size_t len;
json_object *jobj_keyslot, *jobj_digest, *jobj_segment, *jobj_kdf, *jobj_area, *jobj1, *jobj2;
uint32_t key_size;
int i, r, last_active = 0;
uint64_t offset, area_length;
char buf[256], luksMagic[] = LUKS_MAGIC;
jobj_digest = LUKS2_get_digest_jobj(hdr2, 0);
if (!jobj_digest)
return -EINVAL;
jobj_segment = LUKS2_get_segment_jobj(hdr2, CRYPT_DEFAULT_SEGMENT);
if (!jobj_segment)
return -EINVAL;
if (json_segment_get_sector_size(jobj_segment) != SECTOR_SIZE) {
log_err(cd, _("Cannot convert to LUKS1 format - default segment encryption sector size is not 512 bytes."));
return -EINVAL;
}
json_object_object_get_ex(hdr2->jobj, "digests", &jobj1);
if (!json_object_object_get_ex(jobj_digest, "type", &jobj2) ||
strcmp(json_object_get_string(jobj2), "pbkdf2") ||
json_object_object_length(jobj1) != 1) {
log_err(cd, _("Cannot convert to LUKS1 format - key slot digests are not LUKS1 compatible."));
return -EINVAL;
}
if (!json_object_object_get_ex(jobj_digest, "hash", &jobj2))
return -EINVAL;
hash = json_object_get_string(jobj2);
r = crypt_parse_name_and_mode(LUKS2_get_cipher(hdr2, CRYPT_DEFAULT_SEGMENT), cipher, NULL, cipher_mode);
if (r < 0)
return r;
if (crypt_cipher_wrapped_key(cipher, cipher_mode)) {
log_err(cd, _("Cannot convert to LUKS1 format - device uses wrapped key cipher %s."), cipher);
return -EINVAL;
}
r = LUKS2_tokens_count(hdr2);
if (r < 0)
return r;
if (r > 0) {
log_err(cd, _("Cannot convert to LUKS1 format - LUKS2 header contains %u token(s)."), r);
return -EINVAL;
}
r = LUKS2_get_volume_key_size(hdr2, 0);
if (r < 0)
return -EINVAL;
key_size = r;
for (i = 0; i < LUKS2_KEYSLOTS_MAX; i++) {
if (LUKS2_keyslot_info(hdr2, i) == CRYPT_SLOT_INACTIVE)
continue;
if (LUKS2_keyslot_info(hdr2, i) == CRYPT_SLOT_INVALID) {
log_err(cd, _("Cannot convert to LUKS1 format - keyslot %u is in invalid state."), i);
return -EINVAL;
}
if (i >= LUKS_NUMKEYS) {
log_err(cd, _("Cannot convert to LUKS1 format - slot %u (over maximum slots) is still active."), i);
return -EINVAL;
}
if (!keyslot_LUKS1_compatible(cd, hdr2, i, key_size, hash)) {
log_err(cd, _("Cannot convert to LUKS1 format - keyslot %u is not LUKS1 compatible."), i);
return -EINVAL;
}
}
memset(hdr1, 0, sizeof(*hdr1));
for (i = 0; i < LUKS_NUMKEYS; i++) {
hdr1->keyblock[i].active = LUKS_KEY_DISABLED;
hdr1->keyblock[i].stripes = LUKS_STRIPES;
jobj_keyslot = LUKS2_get_keyslot_jobj(hdr2, i);
if (jobj_keyslot) {
if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area))
return -EINVAL;
if (!json_object_object_get_ex(jobj_area, "offset", &jobj1))
return -EINVAL;
offset = crypt_jobj_get_uint64(jobj1);
} else {
if (LUKS2_find_area_gap(cd, hdr2, key_size, &offset, &area_length))
return -EINVAL;
/*
* We have to create placeholder luks2 keyslots in place of all
* inactive keyslots. Otherwise we would allocate all
* inactive luks1 keyslots over same binary keyslot area.
*/
if (placeholder_keyslot_alloc(cd, i, offset, area_length, key_size))
return -EINVAL;
}
offset /= SECTOR_SIZE;
if (offset > UINT32_MAX)
return -EINVAL;
hdr1->keyblock[i].keyMaterialOffset = offset;
hdr1->keyblock[i].keyMaterialOffset -=
((2 * LUKS2_HDR_16K_LEN - LUKS_ALIGN_KEYSLOTS) / SECTOR_SIZE);
if (!jobj_keyslot)
continue;
hdr1->keyblock[i].active = LUKS_KEY_ENABLED;
last_active = i;
if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf))
continue;
if (!json_object_object_get_ex(jobj_kdf, "iterations", &jobj1))
continue;
hdr1->keyblock[i].passwordIterations = crypt_jobj_get_uint32(jobj1);
if (!json_object_object_get_ex(jobj_kdf, "salt", &jobj1))
continue;
len = sizeof(buf);
memset(buf, 0, len);
if (!base64_decode(json_object_get_string(jobj1),
json_object_get_string_len(jobj1), buf, &len))
continue;
if (len > 0 && len != LUKS_SALTSIZE)
continue;
memcpy(hdr1->keyblock[i].passwordSalt, buf, LUKS_SALTSIZE);
}
if (!jobj_keyslot) {
jobj_keyslot = LUKS2_get_keyslot_jobj(hdr2, last_active);
if (!jobj_keyslot)
return -EINVAL;
}
if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area))
return -EINVAL;
if (!json_object_object_get_ex(jobj_area, "encryption", &jobj1))
return -EINVAL;
r = crypt_parse_name_and_mode(json_object_get_string(jobj1), cipher, NULL, cipher_mode);
if (r < 0)
return r;
strncpy(hdr1->cipherName, cipher, sizeof(hdr1->cipherName) - 1);
strncpy(hdr1->cipherMode, cipher_mode, sizeof(hdr1->cipherMode) - 1);
if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf))
return -EINVAL;
if (!json_object_object_get_ex(jobj_kdf, "hash", &jobj1))
return -EINVAL;
strncpy(hdr1->hashSpec, json_object_get_string(jobj1), sizeof(hdr1->hashSpec) - 1);
hdr1->keyBytes = key_size;
if (!json_object_object_get_ex(jobj_digest, "iterations", &jobj1))
return -EINVAL;
hdr1->mkDigestIterations = crypt_jobj_get_uint32(jobj1);
if (!json_object_object_get_ex(jobj_digest, "digest", &jobj1))
return -EINVAL;
len = sizeof(digest);
if (!base64_decode(json_object_get_string(jobj1),
json_object_get_string_len(jobj1), digest, &len))
return -EINVAL;
/* We can store full digest here, not only sha1 length */
if (len < LUKS_DIGESTSIZE)
return -EINVAL;
memcpy(hdr1->mkDigest, digest, LUKS_DIGESTSIZE);
if (!json_object_object_get_ex(jobj_digest, "salt", &jobj1))
return -EINVAL;
len = sizeof(digest_salt);
if (!base64_decode(json_object_get_string(jobj1),
json_object_get_string_len(jobj1), digest_salt, &len))
return -EINVAL;
if (len != LUKS_SALTSIZE)
return -EINVAL;
memcpy(hdr1->mkDigestSalt, digest_salt, LUKS_SALTSIZE);
if (!json_object_object_get_ex(jobj_segment, "offset", &jobj1))
return -EINVAL;
offset = crypt_jobj_get_uint64(jobj1) / SECTOR_SIZE;
if (offset > UINT32_MAX)
return -EINVAL;
/* FIXME: LUKS1 requires offset == 0 || offset >= luks1_hdr_size */
hdr1->payloadOffset = offset;
strncpy(hdr1->uuid, hdr2->uuid, UUID_STRING_L); /* max 36 chars */
hdr1->uuid[UUID_STRING_L-1] = '\0';
memcpy(hdr1->magic, luksMagic, LUKS_MAGIC_L);
hdr1->version = 1;
r = luks_header_in_use(cd);
if (r)
return r > 0 ? -EBUSY : r;
// move keyslots 32k -> 4k offset
buf_offset = 2 * LUKS2_HDR_16K_LEN;
buf_size = LUKS2_keyslots_size(hdr2->jobj);
r = move_keyslot_areas(cd, buf_offset, 8 * SECTOR_SIZE, buf_size);
if (r < 0) {
log_err(cd, _("Unable to move keyslot area."));
return r;
}
crypt_wipe_device(cd, crypt_metadata_device(cd), CRYPT_WIPE_ZERO, 0,
8 * SECTOR_SIZE, 8 * SECTOR_SIZE, NULL, NULL);
// Write LUKS1 hdr
return LUKS_write_phdr(hdr1, cd);
}