diff options
Diffstat (limited to 'lib/luks2/luks2_keyslot_luks2.c')
| -rw-r--r-- | lib/luks2/luks2_keyslot_luks2.c | 785 |
1 files changed, 785 insertions, 0 deletions
diff --git a/lib/luks2/luks2_keyslot_luks2.c b/lib/luks2/luks2_keyslot_luks2.c new file mode 100644 index 0000000..189a3cb --- /dev/null +++ b/lib/luks2/luks2_keyslot_luks2.c @@ -0,0 +1,785 @@ +/* + * LUKS - Linux Unified Key Setup v2, LUKS2 type keyslot handler + * + * Copyright (C) 2015-2021 Red Hat, Inc. All rights reserved. + * Copyright (C) 2015-2021 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" + +/* FIXME: move keyslot encryption to crypto backend */ +#include "../luks1/af.h" + +#define LUKS_SALTSIZE 32 +#define LUKS_SLOT_ITERATIONS_MIN 1000 +#define LUKS_STRIPES 4000 + +/* Serialize memory-hard keyslot access: optional workaround for parallel processing */ +#define MIN_MEMORY_FOR_SERIALIZE_LOCK_KB 32*1024 /* 32MB */ + +static int luks2_encrypt_to_storage(char *src, size_t srcLength, + const char *cipher, const char *cipher_mode, + struct volume_key *vk, unsigned int sector, + struct crypt_device *cd) +{ +#ifndef ENABLE_AF_ALG /* Support for old kernel without Crypto API */ + return LUKS_encrypt_to_storage(src, srcLength, cipher, cipher_mode, vk, sector, cd); +#else + struct crypt_storage *s; + int devfd, r; + struct device *device = crypt_metadata_device(cd); + + /* Only whole sector writes supported */ + if (MISALIGNED_512(srcLength)) + return -EINVAL; + + /* Encrypt buffer */ + r = crypt_storage_init(&s, SECTOR_SIZE, cipher, cipher_mode, vk->key, vk->keylength, false); + if (r) { + log_err(cd, _("Cannot use %s-%s cipher for keyslot encryption."), cipher, cipher_mode); + return r; + } + + r = crypt_storage_encrypt(s, 0, srcLength, src); + crypt_storage_destroy(s); + if (r) { + log_err(cd, _("IO error while encrypting keyslot.")); + return r; + } + + devfd = device_open_locked(cd, device, O_RDWR); + if (devfd >= 0) { + if (write_lseek_blockwise(devfd, device_block_size(cd, device), + device_alignment(device), src, + srcLength, sector * SECTOR_SIZE) < 0) + r = -EIO; + else + r = 0; + + device_sync(cd, device); + } else + r = -EIO; + + if (r) + log_err(cd, _("IO error while encrypting keyslot.")); + + return r; +#endif +} + +static int luks2_decrypt_from_storage(char *dst, size_t dstLength, + const char *cipher, const char *cipher_mode, struct volume_key *vk, + unsigned int sector, struct crypt_device *cd) +{ + struct device *device = crypt_metadata_device(cd); +#ifndef ENABLE_AF_ALG /* Support for old kernel without Crypto API */ + int r = device_read_lock(cd, device); + if (r) { + log_err(cd, _("Failed to acquire read lock on device %s."), device_path(device)); + return r; + } + r = LUKS_decrypt_from_storage(dst, dstLength, cipher, cipher_mode, vk, sector, cd); + device_read_unlock(cd, crypt_metadata_device(cd)); + return r; +#else + struct crypt_storage *s; + int devfd, r; + + /* Only whole sector writes supported */ + if (MISALIGNED_512(dstLength)) + return -EINVAL; + + r = crypt_storage_init(&s, SECTOR_SIZE, cipher, cipher_mode, vk->key, vk->keylength, false); + if (r) { + log_err(cd, _("Cannot use %s-%s cipher for keyslot encryption."), cipher, cipher_mode); + return r; + } + + r = device_read_lock(cd, device); + if (r) { + log_err(cd, _("Failed to acquire read lock on device %s."), + device_path(device)); + crypt_storage_destroy(s); + return r; + } + + devfd = device_open_locked(cd, device, O_RDONLY); + if (devfd >= 0) { + if (read_lseek_blockwise(devfd, device_block_size(cd, device), + device_alignment(device), dst, + dstLength, sector * SECTOR_SIZE) < 0) + r = -EIO; + else + r = 0; + } else + r = -EIO; + + device_read_unlock(cd, device); + + /* Decrypt buffer */ + if (!r) + r = crypt_storage_decrypt(s, 0, dstLength, dst); + else + log_err(cd, _("IO error while decrypting keyslot.")); + + crypt_storage_destroy(s); + return r; +#endif +} + +static int luks2_keyslot_get_pbkdf_params(json_object *jobj_keyslot, + struct crypt_pbkdf_type *pbkdf, char *salt) +{ + json_object *jobj_kdf, *jobj1, *jobj2; + size_t salt_len; + + if (!jobj_keyslot || !pbkdf) + return -EINVAL; + + memset(pbkdf, 0, sizeof(*pbkdf)); + + if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf)) + return -EINVAL; + + if (!json_object_object_get_ex(jobj_kdf, "type", &jobj1)) + return -EINVAL; + pbkdf->type = json_object_get_string(jobj1); + if (!strcmp(pbkdf->type, CRYPT_KDF_PBKDF2)) { + if (!json_object_object_get_ex(jobj_kdf, "hash", &jobj2)) + return -EINVAL; + pbkdf->hash = json_object_get_string(jobj2); + if (!json_object_object_get_ex(jobj_kdf, "iterations", &jobj2)) + return -EINVAL; + pbkdf->iterations = json_object_get_int(jobj2); + pbkdf->max_memory_kb = 0; + pbkdf->parallel_threads = 0; + } else { + if (!json_object_object_get_ex(jobj_kdf, "time", &jobj2)) + return -EINVAL; + pbkdf->iterations = json_object_get_int(jobj2); + if (!json_object_object_get_ex(jobj_kdf, "memory", &jobj2)) + return -EINVAL; + pbkdf->max_memory_kb = json_object_get_int(jobj2); + if (!json_object_object_get_ex(jobj_kdf, "cpus", &jobj2)) + return -EINVAL; + pbkdf->parallel_threads = json_object_get_int(jobj2); + } + + if (!json_object_object_get_ex(jobj_kdf, "salt", &jobj2)) + return -EINVAL; + salt_len = LUKS_SALTSIZE; + if (!base64_decode(json_object_get_string(jobj2), + json_object_get_string_len(jobj2), + salt, &salt_len)) + return -EINVAL; + if (salt_len != LUKS_SALTSIZE) + return -EINVAL; + + return 0; +} + +static int luks2_keyslot_set_key(struct crypt_device *cd, + json_object *jobj_keyslot, + const char *password, size_t passwordLen, + const char *volume_key, size_t volume_key_len) +{ + struct volume_key *derived_key; + char salt[LUKS_SALTSIZE], cipher[MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN]; + char *AfKey = NULL; + const char *af_hash = NULL; + size_t AFEKSize, keyslot_key_len; + json_object *jobj2, *jobj_kdf, *jobj_af, *jobj_area; + uint64_t area_offset; + struct crypt_pbkdf_type pbkdf; + int r; + + if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf) || + !json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) || + !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return -EINVAL; + + /* prevent accidental volume key size change after allocation */ + if (!json_object_object_get_ex(jobj_keyslot, "key_size", &jobj2)) + return -EINVAL; + if (json_object_get_int(jobj2) != (int)volume_key_len) + return -EINVAL; + + if (!json_object_object_get_ex(jobj_area, "offset", &jobj2)) + return -EINVAL; + area_offset = crypt_jobj_get_uint64(jobj2); + + if (!json_object_object_get_ex(jobj_area, "encryption", &jobj2)) + return -EINVAL; + r = crypt_parse_name_and_mode(json_object_get_string(jobj2), cipher, NULL, cipher_mode); + if (r < 0) + return r; + + if (!json_object_object_get_ex(jobj_area, "key_size", &jobj2)) + return -EINVAL; + keyslot_key_len = json_object_get_int(jobj2); + + if (!json_object_object_get_ex(jobj_af, "hash", &jobj2)) + return -EINVAL; + af_hash = json_object_get_string(jobj2); + + if (luks2_keyslot_get_pbkdf_params(jobj_keyslot, &pbkdf, salt)) + return -EINVAL; + + /* + * Allocate derived key storage. + */ + derived_key = crypt_alloc_volume_key(keyslot_key_len, NULL); + if (!derived_key) + return -ENOMEM; + /* + * Calculate keyslot content, split and store it to keyslot area. + */ + r = crypt_pbkdf(pbkdf.type, pbkdf.hash, password, passwordLen, + salt, LUKS_SALTSIZE, + derived_key->key, derived_key->keylength, + pbkdf.iterations, pbkdf.max_memory_kb, + pbkdf.parallel_threads); + if (r < 0) { + crypt_free_volume_key(derived_key); + return r; + } + + // FIXME: verity key_size to AFEKSize + AFEKSize = AF_split_sectors(volume_key_len, LUKS_STRIPES) * SECTOR_SIZE; + AfKey = crypt_safe_alloc(AFEKSize); + if (!AfKey) { + crypt_free_volume_key(derived_key); + return -ENOMEM; + } + + r = AF_split(cd, volume_key, AfKey, volume_key_len, LUKS_STRIPES, af_hash); + + if (r == 0) { + log_dbg(cd, "Updating keyslot area [0x%04x].", (unsigned)area_offset); + /* FIXME: sector_offset should be size_t, fix LUKS_encrypt... accordingly */ + r = luks2_encrypt_to_storage(AfKey, AFEKSize, cipher, cipher_mode, + derived_key, (unsigned)(area_offset / SECTOR_SIZE), cd); + } + + crypt_safe_free(AfKey); + crypt_free_volume_key(derived_key); + if (r < 0) + return r; + + return 0; +} + +static int luks2_keyslot_get_key(struct crypt_device *cd, + json_object *jobj_keyslot, + const char *password, size_t passwordLen, + char *volume_key, size_t volume_key_len) +{ + struct volume_key *derived_key; + struct crypt_pbkdf_type pbkdf; + char *AfKey; + size_t AFEKSize; + const char *af_hash = NULL; + char salt[LUKS_SALTSIZE], cipher[MAX_CIPHER_LEN], cipher_mode[MAX_CIPHER_LEN]; + json_object *jobj2, *jobj_af, *jobj_area; + uint64_t area_offset; + size_t keyslot_key_len; + bool try_serialize_lock = false; + int r; + + if (!json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) || + !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return -EINVAL; + + if (luks2_keyslot_get_pbkdf_params(jobj_keyslot, &pbkdf, salt)) + return -EINVAL; + + if (!json_object_object_get_ex(jobj_af, "hash", &jobj2)) + return -EINVAL; + af_hash = json_object_get_string(jobj2); + + if (!json_object_object_get_ex(jobj_area, "offset", &jobj2)) + return -EINVAL; + area_offset = crypt_jobj_get_uint64(jobj2); + + if (!json_object_object_get_ex(jobj_area, "encryption", &jobj2)) + return -EINVAL; + r = crypt_parse_name_and_mode(json_object_get_string(jobj2), cipher, NULL, cipher_mode); + if (r < 0) + return r; + + if (!json_object_object_get_ex(jobj_area, "key_size", &jobj2)) + return -EINVAL; + keyslot_key_len = json_object_get_int(jobj2); + + /* + * If requested, serialize unlocking for memory-hard KDF. Usually NOOP. + */ + if (pbkdf.max_memory_kb > MIN_MEMORY_FOR_SERIALIZE_LOCK_KB) + try_serialize_lock = true; + if (try_serialize_lock && crypt_serialize_lock(cd)) + return -EINVAL; + /* + * Allocate derived key storage space. + */ + derived_key = crypt_alloc_volume_key(keyslot_key_len, NULL); + if (!derived_key) + return -ENOMEM; + + AFEKSize = AF_split_sectors(volume_key_len, LUKS_STRIPES) * SECTOR_SIZE; + AfKey = crypt_safe_alloc(AFEKSize); + if (!AfKey) { + crypt_free_volume_key(derived_key); + return -ENOMEM; + } + /* + * Calculate derived key, decrypt keyslot content and merge it. + */ + r = crypt_pbkdf(pbkdf.type, pbkdf.hash, password, passwordLen, + salt, LUKS_SALTSIZE, + derived_key->key, derived_key->keylength, + pbkdf.iterations, pbkdf.max_memory_kb, + pbkdf.parallel_threads); + + if (try_serialize_lock) + crypt_serialize_unlock(cd); + + if (r == 0) { + log_dbg(cd, "Reading keyslot area [0x%04x].", (unsigned)area_offset); + /* FIXME: sector_offset should be size_t, fix LUKS_decrypt... accordingly */ + r = luks2_decrypt_from_storage(AfKey, AFEKSize, cipher, cipher_mode, + derived_key, (unsigned)(area_offset / SECTOR_SIZE), cd); + } + + if (r == 0) + r = AF_merge(cd, AfKey, volume_key, volume_key_len, LUKS_STRIPES, af_hash); + + crypt_free_volume_key(derived_key); + crypt_safe_free(AfKey); + + return r; +} + +/* + * currently we support update of only: + * + * - af hash function + * - kdf params + */ +static int luks2_keyslot_update_json(struct crypt_device *cd, + json_object *jobj_keyslot, + const struct luks2_keyslot_params *params) +{ + const struct crypt_pbkdf_type *pbkdf; + json_object *jobj_af, *jobj_area, *jobj_kdf; + char salt[LUKS_SALTSIZE], *salt_base64 = NULL; + int r; + + /* jobj_keyslot is not yet validated */ + + if (!json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) || + !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return -EINVAL; + + /* update area encryption parameters */ + json_object_object_add(jobj_area, "encryption", json_object_new_string(params->area.raw.encryption)); + json_object_object_add(jobj_area, "key_size", json_object_new_int(params->area.raw.key_size)); + + pbkdf = crypt_get_pbkdf_type(cd); + if (!pbkdf) + return -EINVAL; + + r = crypt_benchmark_pbkdf_internal(cd, CONST_CAST(struct crypt_pbkdf_type *)pbkdf, params->area.raw.key_size); + if (r < 0) + return r; + + /* refresh whole 'kdf' object */ + jobj_kdf = json_object_new_object(); + if (!jobj_kdf) + return -ENOMEM; + json_object_object_add(jobj_kdf, "type", json_object_new_string(pbkdf->type)); + if (!strcmp(pbkdf->type, CRYPT_KDF_PBKDF2)) { + json_object_object_add(jobj_kdf, "hash", json_object_new_string(pbkdf->hash)); + json_object_object_add(jobj_kdf, "iterations", json_object_new_int(pbkdf->iterations)); + } else { + json_object_object_add(jobj_kdf, "time", json_object_new_int(pbkdf->iterations)); + json_object_object_add(jobj_kdf, "memory", json_object_new_int(pbkdf->max_memory_kb)); + json_object_object_add(jobj_kdf, "cpus", json_object_new_int(pbkdf->parallel_threads)); + } + json_object_object_add(jobj_keyslot, "kdf", jobj_kdf); + + /* + * Regenerate salt and add it in 'kdf' object + */ + r = crypt_random_get(cd, salt, LUKS_SALTSIZE, CRYPT_RND_SALT); + if (r < 0) + return r; + base64_encode_alloc(salt, LUKS_SALTSIZE, &salt_base64); + if (!salt_base64) + return -ENOMEM; + json_object_object_add(jobj_kdf, "salt", json_object_new_string(salt_base64)); + free(salt_base64); + + /* update 'af' hash */ + json_object_object_add(jobj_af, "hash", json_object_new_string(params->af.luks1.hash)); + + JSON_DBG(cd, jobj_keyslot, "Keyslot JSON:"); + return 0; +} + +static int luks2_keyslot_alloc(struct crypt_device *cd, + int keyslot, + size_t volume_key_len, + const struct luks2_keyslot_params *params) +{ + struct luks2_hdr *hdr; + uint64_t area_offset, area_length; + json_object *jobj_keyslots, *jobj_keyslot, *jobj_af, *jobj_area; + int r; + + log_dbg(cd, "Trying to allocate LUKS2 keyslot %d.", keyslot); + + if (!params || params->area_type != LUKS2_KEYSLOT_AREA_RAW || + params->af_type != LUKS2_KEYSLOT_AF_LUKS1) { + log_dbg(cd, "Invalid LUKS2 keyslot parameters."); + return -EINVAL; + } + + if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2))) + return -EINVAL; + + if (keyslot == CRYPT_ANY_SLOT) + keyslot = LUKS2_keyslot_find_empty(hdr); + + if (keyslot < 0 || keyslot >= LUKS2_KEYSLOTS_MAX) + return -ENOMEM; + + if (LUKS2_get_keyslot_jobj(hdr, keyslot)) { + log_dbg(cd, "Cannot modify already active keyslot %d.", keyslot); + return -EINVAL; + } + + if (!json_object_object_get_ex(hdr->jobj, "keyslots", &jobj_keyslots)) + return -EINVAL; + + r = LUKS2_find_area_gap(cd, hdr, volume_key_len, &area_offset, &area_length); + if (r < 0) { + log_err(cd, _("No space for new keyslot.")); + return r; + } + + jobj_keyslot = json_object_new_object(); + json_object_object_add(jobj_keyslot, "type", json_object_new_string("luks2")); + json_object_object_add(jobj_keyslot, "key_size", json_object_new_int(volume_key_len)); + + /* AF object */ + jobj_af = json_object_new_object(); + json_object_object_add(jobj_af, "type", json_object_new_string("luks1")); + json_object_object_add(jobj_af, "stripes", json_object_new_int(params->af.luks1.stripes)); + json_object_object_add(jobj_keyslot, "af", jobj_af); + + /* Area object */ + jobj_area = json_object_new_object(); + json_object_object_add(jobj_area, "type", json_object_new_string("raw")); + json_object_object_add(jobj_area, "offset", crypt_jobj_new_uint64(area_offset)); + json_object_object_add(jobj_area, "size", crypt_jobj_new_uint64(area_length)); + json_object_object_add(jobj_keyslot, "area", jobj_area); + + json_object_object_add_by_uint(jobj_keyslots, keyslot, jobj_keyslot); + + r = luks2_keyslot_update_json(cd, jobj_keyslot, params); + + if (!r && LUKS2_check_json_size(cd, hdr)) { + log_dbg(cd, "Not enough space in header json area for new keyslot."); + r = -ENOSPC; + } + + if (r) + json_object_object_del_by_uint(jobj_keyslots, keyslot); + + return r; +} + +static int luks2_keyslot_open(struct crypt_device *cd, + int keyslot, + const char *password, + size_t password_len, + char *volume_key, + size_t volume_key_len) +{ + struct luks2_hdr *hdr; + json_object *jobj_keyslot; + + log_dbg(cd, "Trying to open LUKS2 keyslot %d.", keyslot); + + if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2))) + return -EINVAL; + + jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot); + if (!jobj_keyslot) + return -EINVAL; + + return luks2_keyslot_get_key(cd, jobj_keyslot, + password, password_len, + volume_key, volume_key_len); +} + +/* + * This function must not modify json. + * It's called after luks2 keyslot validation. + */ +static int luks2_keyslot_store(struct crypt_device *cd, + int keyslot, + const char *password, + size_t password_len, + const char *volume_key, + size_t volume_key_len) +{ + struct luks2_hdr *hdr; + json_object *jobj_keyslot; + int r; + + log_dbg(cd, "Calculating attributes for LUKS2 keyslot %d.", keyslot); + + if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2))) + return -EINVAL; + + jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot); + if (!jobj_keyslot) + return -EINVAL; + + r = LUKS2_device_write_lock(cd, hdr, crypt_metadata_device(cd)); + if(r) + return r; + + r = luks2_keyslot_set_key(cd, jobj_keyslot, + password, password_len, + volume_key, volume_key_len); + if (!r) + r = LUKS2_hdr_write(cd, hdr); + + device_write_unlock(cd, crypt_metadata_device(cd)); + + return r < 0 ? r : keyslot; +} + +static int luks2_keyslot_wipe(struct crypt_device *cd, int keyslot) +{ + struct luks2_hdr *hdr; + + if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2))) + return -EINVAL; + + /* Remove any reference of deleted keyslot from digests and tokens */ + LUKS2_digest_assign(cd, hdr, keyslot, CRYPT_ANY_DIGEST, 0, 0); + LUKS2_token_assign(cd, hdr, keyslot, CRYPT_ANY_TOKEN, 0, 0); + + return 0; +} + +static int luks2_keyslot_dump(struct crypt_device *cd, int keyslot) +{ + json_object *jobj_keyslot, *jobj1, *jobj_kdf, *jobj_af, *jobj_area; + + jobj_keyslot = LUKS2_get_keyslot_jobj(crypt_get_hdr(cd, CRYPT_LUKS2), keyslot); + if (!jobj_keyslot) + return -EINVAL; + + if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf) || + !json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) || + !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return -EINVAL; + + json_object_object_get_ex(jobj_area, "encryption", &jobj1); + log_std(cd, "\tCipher: %s\n", json_object_get_string(jobj1)); + + json_object_object_get_ex(jobj_area, "key_size", &jobj1); + log_std(cd, "\tCipher key: %u bits\n", crypt_jobj_get_uint32(jobj1) * 8); + + json_object_object_get_ex(jobj_kdf, "type", &jobj1); + log_std(cd, "\tPBKDF: %s\n", json_object_get_string(jobj1)); + + if (!strcmp(json_object_get_string(jobj1), CRYPT_KDF_PBKDF2)) { + json_object_object_get_ex(jobj_kdf, "hash", &jobj1); + log_std(cd, "\tHash: %s\n", json_object_get_string(jobj1)); + + json_object_object_get_ex(jobj_kdf, "iterations", &jobj1); + log_std(cd, "\tIterations: %" PRIu64 "\n", crypt_jobj_get_uint64(jobj1)); + } else { + json_object_object_get_ex(jobj_kdf, "time", &jobj1); + log_std(cd, "\tTime cost: %" PRIu64 "\n", json_object_get_int64(jobj1)); + + json_object_object_get_ex(jobj_kdf, "memory", &jobj1); + log_std(cd, "\tMemory: %" PRIu64 "\n", json_object_get_int64(jobj1)); + + json_object_object_get_ex(jobj_kdf, "cpus", &jobj1); + log_std(cd, "\tThreads: %" PRIu64 "\n", json_object_get_int64(jobj1)); + } + json_object_object_get_ex(jobj_kdf, "salt", &jobj1); + log_std(cd, "\tSalt: "); + hexprint_base64(cd, jobj1, " ", " "); + + + json_object_object_get_ex(jobj_af, "stripes", &jobj1); + log_std(cd, "\tAF stripes: %u\n", json_object_get_int(jobj1)); + + json_object_object_get_ex(jobj_af, "hash", &jobj1); + log_std(cd, "\tAF hash: %s\n", json_object_get_string(jobj1)); + + json_object_object_get_ex(jobj_area, "offset", &jobj1); + log_std(cd, "\tArea offset:%" PRIu64 " [bytes]\n", crypt_jobj_get_uint64(jobj1)); + + json_object_object_get_ex(jobj_area, "size", &jobj1); + log_std(cd, "\tArea length:%" PRIu64 " [bytes]\n", crypt_jobj_get_uint64(jobj1)); + + return 0; +} + +static int luks2_keyslot_validate(struct crypt_device *cd, json_object *jobj_keyslot) +{ + json_object *jobj_kdf, *jobj_af, *jobj_area, *jobj1; + const char *type; + int count; + + if (!jobj_keyslot) + return -EINVAL; + + if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf) || + !json_object_object_get_ex(jobj_keyslot, "af", &jobj_af) || + !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return -EINVAL; + + count = json_object_object_length(jobj_kdf); + + jobj1 = json_contains(cd, jobj_kdf, "", "kdf section", "type", json_type_string); + if (!jobj1) + return -EINVAL; + type = json_object_get_string(jobj1); + + if (!strcmp(type, CRYPT_KDF_PBKDF2)) { + if (count != 4 || /* type, salt, hash, iterations only */ + !json_contains(cd, jobj_kdf, "kdf type", type, "hash", json_type_string) || + !json_contains(cd, jobj_kdf, "kdf type", type, "iterations", json_type_int) || + !json_contains(cd, jobj_kdf, "kdf type", type, "salt", json_type_string)) + return -EINVAL; + } else if (!strcmp(type, CRYPT_KDF_ARGON2I) || !strcmp(type, CRYPT_KDF_ARGON2ID)) { + if (count != 5 || /* type, salt, time, memory, cpus only */ + !json_contains(cd, jobj_kdf, "kdf type", type, "time", json_type_int) || + !json_contains(cd, jobj_kdf, "kdf type", type, "memory", json_type_int) || + !json_contains(cd, jobj_kdf, "kdf type", type, "cpus", json_type_int) || + !json_contains(cd, jobj_kdf, "kdf type", type, "salt", json_type_string)) + return -EINVAL; + } + + if (!json_object_object_get_ex(jobj_af, "type", &jobj1)) + return -EINVAL; + if (!strcmp(json_object_get_string(jobj1), "luks1")) { + if (!json_contains(cd, jobj_af, "", "luks1 af", "hash", json_type_string) || + !json_contains(cd, jobj_af, "", "luks1 af", "stripes", json_type_int)) + return -EINVAL; + } else + return -EINVAL; + + // FIXME check numbered + if (!json_object_object_get_ex(jobj_area, "type", &jobj1)) + return -EINVAL; + if (!strcmp(json_object_get_string(jobj1), "raw")) { + if (!json_contains(cd, jobj_area, "area", "raw type", "encryption", json_type_string) || + !json_contains(cd, jobj_area, "area", "raw type", "key_size", json_type_int) || + !json_contains(cd, jobj_area, "area", "raw type", "offset", json_type_string) || + !json_contains(cd, jobj_area, "area", "raw type", "size", json_type_string)) + return -EINVAL; + } else + return -EINVAL; + + return 0; +} + +static int luks2_keyslot_update(struct crypt_device *cd, + int keyslot, + const struct luks2_keyslot_params *params) +{ + struct luks2_hdr *hdr; + json_object *jobj_keyslot; + int r; + + log_dbg(cd, "Updating LUKS2 keyslot %d.", keyslot); + + if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2))) + return -EINVAL; + + jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot); + if (!jobj_keyslot) + return -EINVAL; + + r = luks2_keyslot_update_json(cd, jobj_keyslot, params); + + if (!r && LUKS2_check_json_size(cd, hdr)) { + log_dbg(cd, "Not enough space in header json area for updated keyslot %d.", keyslot); + r = -ENOSPC; + } + + return r; +} + +static void luks2_keyslot_repair(struct crypt_device *cd, json_object *jobj_keyslot) +{ + const char *type; + json_object *jobj_kdf, *jobj_type; + + if (!json_object_object_get_ex(jobj_keyslot, "kdf", &jobj_kdf) || + !json_object_is_type(jobj_kdf, json_type_object)) + return; + + if (!json_object_object_get_ex(jobj_kdf, "type", &jobj_type) || + !json_object_is_type(jobj_type, json_type_string)) + return; + + type = json_object_get_string(jobj_type); + + if (!strcmp(type, CRYPT_KDF_PBKDF2)) { + /* type, salt, hash, iterations only */ + json_object_object_foreach(jobj_kdf, key, val) { + UNUSED(val); + if (!strcmp(key, "type") || !strcmp(key, "salt") || + !strcmp(key, "hash") || !strcmp(key, "iterations")) + continue; + json_object_object_del(jobj_kdf, key); + } + } else if (!strcmp(type, CRYPT_KDF_ARGON2I) || !strcmp(type, CRYPT_KDF_ARGON2ID)) { + /* type, salt, time, memory, cpus only */ + json_object_object_foreach(jobj_kdf, key, val) { + UNUSED(val); + if (!strcmp(key, "type") || !strcmp(key, "salt") || + !strcmp(key, "time") || !strcmp(key, "memory") || + !strcmp(key, "cpus")) + continue; + json_object_object_del(jobj_kdf, key); + } + } +} + +const keyslot_handler luks2_keyslot = { + .name = "luks2", + .alloc = luks2_keyslot_alloc, + .update = luks2_keyslot_update, + .open = luks2_keyslot_open, + .store = luks2_keyslot_store, + .wipe = luks2_keyslot_wipe, + .dump = luks2_keyslot_dump, + .validate = luks2_keyslot_validate, + .repair = luks2_keyslot_repair +}; |