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-rw-r--r--lib/luks2/luks2_keyslot_reenc.c752
1 files changed, 752 insertions, 0 deletions
diff --git a/lib/luks2/luks2_keyslot_reenc.c b/lib/luks2/luks2_keyslot_reenc.c
new file mode 100644
index 0000000..4291d0c
--- /dev/null
+++ b/lib/luks2/luks2_keyslot_reenc.c
@@ -0,0 +1,752 @@
+/*
+ * LUKS - Linux Unified Key Setup v2, reencryption keyslot handler
+ *
+ * Copyright (C) 2016-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2016-2023 Ondrej Kozina
+ *
+ * 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"
+
+static int reenc_keyslot_open(struct crypt_device *cd __attribute__((unused)),
+ int keyslot __attribute__((unused)),
+ const char *password __attribute__((unused)),
+ size_t password_len __attribute__((unused)),
+ char *volume_key __attribute__((unused)),
+ size_t volume_key_len __attribute__((unused)))
+{
+ return -ENOENT;
+}
+
+static json_object *reencrypt_keyslot_area_jobj(struct crypt_device *cd,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment,
+ uint64_t area_offset,
+ uint64_t area_length)
+{
+ json_object *jobj_area = json_object_new_object();
+
+ if (!jobj_area || !params || !params->resilience)
+ return NULL;
+
+ 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_area, "type", json_object_new_string(params->resilience));
+
+ if (!strcmp(params->resilience, "checksum")) {
+ log_dbg(cd, "Setting reencrypt keyslot for checksum protection.");
+ json_object_object_add(jobj_area, "hash", json_object_new_string(params->hash));
+ json_object_object_add(jobj_area, "sector_size", json_object_new_int64(alignment));
+ } else if (!strcmp(params->resilience, "journal")) {
+ log_dbg(cd, "Setting reencrypt keyslot for journal protection.");
+ } else if (!strcmp(params->resilience, "none")) {
+ log_dbg(cd, "Setting reencrypt keyslot for none protection.");
+ } else if (!strcmp(params->resilience, "datashift")) {
+ log_dbg(cd, "Setting reencrypt keyslot for datashift protection.");
+ json_object_object_add(jobj_area, "shift_size",
+ crypt_jobj_new_uint64(params->data_shift << SECTOR_SHIFT));
+ } else if (!strcmp(params->resilience, "datashift-checksum")) {
+ log_dbg(cd, "Setting reencrypt keyslot for datashift and checksum protection.");
+ json_object_object_add(jobj_area, "hash", json_object_new_string(params->hash));
+ json_object_object_add(jobj_area, "sector_size", json_object_new_int64(alignment));
+ json_object_object_add(jobj_area, "shift_size",
+ crypt_jobj_new_uint64(params->data_shift << SECTOR_SHIFT));
+ } else if (!strcmp(params->resilience, "datashift-journal")) {
+ log_dbg(cd, "Setting reencrypt keyslot for datashift and journal protection.");
+ json_object_object_add(jobj_area, "shift_size",
+ crypt_jobj_new_uint64(params->data_shift << SECTOR_SHIFT));
+ } else {
+ json_object_put(jobj_area);
+ return NULL;
+ }
+
+ return jobj_area;
+}
+
+static json_object *reencrypt_keyslot_area_jobj_update_block_size(struct crypt_device *cd,
+ json_object *jobj_area, size_t alignment)
+{
+ json_object *jobj_type, *jobj_area_new = NULL;
+
+ if (!jobj_area ||
+ !json_object_object_get_ex(jobj_area, "type", &jobj_type) ||
+ (strcmp(json_object_get_string(jobj_type), "checksum") &&
+ strcmp(json_object_get_string(jobj_type), "datashift-checksum")))
+ return NULL;
+
+ if (json_object_copy(jobj_area, &jobj_area_new))
+ return NULL;
+
+ log_dbg(cd, "Updating reencrypt resilience checksum block size.");
+
+ json_object_object_add(jobj_area_new, "sector_size", json_object_new_int64(alignment));
+
+ return jobj_area_new;
+}
+
+static int reenc_keyslot_alloc(struct crypt_device *cd,
+ struct luks2_hdr *hdr,
+ int keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment)
+{
+ int r;
+ json_object *jobj_keyslots, *jobj_keyslot, *jobj_area;
+ uint64_t area_offset, area_length;
+
+ log_dbg(cd, "Allocating reencrypt keyslot %d.", keyslot);
+
+ if (!params || !params->resilience || params->direction > CRYPT_REENCRYPT_BACKWARD)
+ return -EINVAL;
+
+ if (keyslot < 0 || keyslot >= LUKS2_KEYSLOTS_MAX)
+ return -ENOMEM;
+
+ if (!json_object_object_get_ex(hdr->jobj, "keyslots", &jobj_keyslots))
+ return -EINVAL;
+
+ /* only plain datashift resilience mode does not require additional storage */
+ if (!strcmp(params->resilience, "datashift"))
+ r = LUKS2_find_area_gap(cd, hdr, 1, &area_offset, &area_length);
+ else
+ r = LUKS2_find_area_max_gap(cd, hdr, &area_offset, &area_length);
+ if (r < 0)
+ return r;
+
+ jobj_area = reencrypt_keyslot_area_jobj(cd, params, alignment, area_offset, area_length);
+ if (!jobj_area)
+ return -EINVAL;
+
+ jobj_keyslot = json_object_new_object();
+ if (!jobj_keyslot) {
+ json_object_put(jobj_area);
+ return -ENOMEM;
+ }
+ json_object_object_add(jobj_keyslot, "area", jobj_area);
+
+ json_object_object_add(jobj_keyslot, "type", json_object_new_string("reencrypt"));
+ json_object_object_add(jobj_keyslot, "key_size", json_object_new_int(1)); /* useless but mandatory */
+ json_object_object_add(jobj_keyslot, "mode", json_object_new_string(crypt_reencrypt_mode_to_str(params->mode)));
+ if (params->direction == CRYPT_REENCRYPT_FORWARD)
+ json_object_object_add(jobj_keyslot, "direction", json_object_new_string("forward"));
+ else
+ json_object_object_add(jobj_keyslot, "direction", json_object_new_string("backward"));
+
+ json_object_object_add_by_uint(jobj_keyslots, keyslot, jobj_keyslot);
+ if (LUKS2_check_json_size(cd, hdr)) {
+ log_dbg(cd, "New keyslot too large to fit in free metadata space.");
+ json_object_object_del_by_uint(jobj_keyslots, keyslot);
+ return -ENOSPC;
+ }
+
+ JSON_DBG(cd, hdr->jobj, "JSON:");
+
+ return 0;
+}
+
+static int reenc_keyslot_store_data(struct crypt_device *cd,
+ json_object *jobj_keyslot,
+ const void *buffer, size_t buffer_len)
+{
+ int devfd, r;
+ json_object *jobj_area, *jobj_offset, *jobj_length;
+ uint64_t area_offset, area_length;
+ struct device *device = crypt_metadata_device(cd);
+
+ if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area) ||
+ !json_object_object_get_ex(jobj_area, "offset", &jobj_offset) ||
+ !json_object_object_get_ex(jobj_area, "size", &jobj_length))
+ return -EINVAL;
+
+ area_offset = crypt_jobj_get_uint64(jobj_offset);
+ area_length = crypt_jobj_get_uint64(jobj_length);
+
+ if (!area_offset || !area_length || ((uint64_t)buffer_len > area_length))
+ return -EINVAL;
+
+ devfd = device_open_locked(cd, device, O_RDWR);
+ if (devfd >= 0) {
+ if (write_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), CONST_CAST(void *)buffer,
+ buffer_len, area_offset) < 0)
+ r = -EIO;
+ else
+ r = 0;
+ } else
+ r = -EINVAL;
+
+ if (r)
+ log_err(cd, _("IO error while encrypting keyslot."));
+
+ return r;
+}
+
+static int reenc_keyslot_store(struct crypt_device *cd,
+ int keyslot,
+ const char *password __attribute__((unused)),
+ size_t password_len __attribute__((unused)),
+ const char *buffer,
+ size_t buffer_len)
+{
+ struct luks2_hdr *hdr;
+ json_object *jobj_keyslot;
+ int r = 0;
+
+ if (!cd || !buffer || !buffer_len)
+ return -EINVAL;
+
+ if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2)))
+ return -EINVAL;
+
+ log_dbg(cd, "Reencrypt keyslot %d store.", keyslot);
+
+ 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 = reenc_keyslot_store_data(cd, jobj_keyslot, buffer, buffer_len);
+ if (r < 0) {
+ device_write_unlock(cd, crypt_metadata_device(cd));
+ return r;
+ }
+
+ r = LUKS2_hdr_write(cd, hdr);
+
+ device_write_unlock(cd, crypt_metadata_device(cd));
+
+ return r < 0 ? r : keyslot;
+}
+
+static int reenc_keyslot_wipe(struct crypt_device *cd,
+ int keyslot)
+{
+ struct luks2_hdr *hdr;
+
+ if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2)))
+ return -EINVAL;
+
+ /* remove reencryption verification data */
+ LUKS2_digest_assign(cd, hdr, keyslot, CRYPT_ANY_DIGEST, 0, 0);
+
+ return 0;
+}
+
+static int reenc_keyslot_dump(struct crypt_device *cd, int keyslot)
+{
+ json_object *jobj_keyslot, *jobj_area, *jobj_direction, *jobj_mode, *jobj_resilience,
+ *jobj1;
+
+ 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, "direction", &jobj_direction) ||
+ !json_object_object_get_ex(jobj_keyslot, "mode", &jobj_mode) ||
+ !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area) ||
+ !json_object_object_get_ex(jobj_area, "type", &jobj_resilience))
+ return -EINVAL;
+
+ log_std(cd, "\t%-12s%s\n", "Mode:", json_object_get_string(jobj_mode));
+ log_std(cd, "\t%-12s%s\n", "Direction:", json_object_get_string(jobj_direction));
+ log_std(cd, "\t%-12s%s\n", "Resilience:", json_object_get_string(jobj_resilience));
+
+ if (!strcmp(json_object_get_string(jobj_resilience), "checksum")) {
+ json_object_object_get_ex(jobj_area, "hash", &jobj1);
+ log_std(cd, "\t%-12s%s\n", "Hash:", json_object_get_string(jobj1));
+ json_object_object_get_ex(jobj_area, "sector_size", &jobj1);
+ log_std(cd, "\t%-12s%d [bytes]\n", "Hash data:", json_object_get_int(jobj1));
+ } else if (!strcmp(json_object_get_string(jobj_resilience), "datashift")) {
+ json_object_object_get_ex(jobj_area, "shift_size", &jobj1);
+ log_std(cd, "\t%-12s%" PRIu64 "[bytes]\n", "Shift size:", crypt_jobj_get_uint64(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 reenc_keyslot_validate(struct crypt_device *cd, json_object *jobj_keyslot)
+{
+ json_object *jobj_mode, *jobj_area, *jobj_type, *jobj_shift_size, *jobj_hash,
+ *jobj_sector_size, *jobj_direction, *jobj_key_size;
+ const char *mode, *type, *direction;
+ uint32_t sector_size;
+ uint64_t shift_size;
+
+ /* mode (string: encrypt,reencrypt,decrypt)
+ * direction (string:)
+ * area {
+ * type: (string: datashift, journal, checksum, none, datashift-journal, datashift-checksum)
+ * hash: (string: checksum and datashift-checksum types)
+ * sector_size (uint32: checksum and datashift-checksum types)
+ * shift_size (uint64: all datashift based types)
+ * }
+ */
+
+ /* area and area type are validated in general validation code */
+ if (!jobj_keyslot || !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area) ||
+ !json_object_object_get_ex(jobj_area, "type", &jobj_type))
+ return -EINVAL;
+
+ jobj_key_size = json_contains(cd, jobj_keyslot, "", "reencrypt keyslot", "key_size", json_type_int);
+ jobj_mode = json_contains_string(cd, jobj_keyslot, "", "reencrypt keyslot", "mode");
+ jobj_direction = json_contains_string(cd, jobj_keyslot, "", "reencrypt keyslot", "direction");
+
+ if (!jobj_mode || !jobj_direction || !jobj_key_size)
+ return -EINVAL;
+
+ if (!validate_json_uint32(jobj_key_size) || crypt_jobj_get_uint32(jobj_key_size) != 1) {
+ log_dbg(cd, "Illegal reencrypt key size.");
+ return -EINVAL;
+ }
+
+ mode = json_object_get_string(jobj_mode);
+ type = json_object_get_string(jobj_type);
+ direction = json_object_get_string(jobj_direction);
+
+ if (strcmp(mode, "reencrypt") && strcmp(mode, "encrypt") &&
+ strcmp(mode, "decrypt")) {
+ log_dbg(cd, "Illegal reencrypt mode %s.", mode);
+ return -EINVAL;
+ }
+
+ if (strcmp(direction, "forward") && strcmp(direction, "backward")) {
+ log_dbg(cd, "Illegal reencrypt direction %s.", direction);
+ return -EINVAL;
+ }
+
+ if (!strcmp(type, "checksum") || !strcmp(type, "datashift-checksum")) {
+ jobj_hash = json_contains_string(cd, jobj_area, "type:checksum",
+ "Keyslot area", "hash");
+ jobj_sector_size = json_contains(cd, jobj_area, "type:checksum",
+ "Keyslot area", "sector_size", json_type_int);
+ if (!jobj_hash || !jobj_sector_size)
+ return -EINVAL;
+ if (!validate_json_uint32(jobj_sector_size))
+ return -EINVAL;
+ sector_size = crypt_jobj_get_uint32(jobj_sector_size);
+ if (sector_size < SECTOR_SIZE || NOTPOW2(sector_size)) {
+ log_dbg(cd, "Invalid sector_size (%" PRIu32 ") for checksum resilience mode.",
+ sector_size);
+ return -EINVAL;
+ }
+ } else if (!strcmp(type, "datashift") ||
+ !strcmp(type, "datashift-checksum") ||
+ !strcmp(type, "datashift-journal")) {
+ if (!(jobj_shift_size = json_contains_string(cd, jobj_area, "type:datashift",
+ "Keyslot area", "shift_size")))
+ return -EINVAL;
+
+ shift_size = crypt_jobj_get_uint64(jobj_shift_size);
+ if (!shift_size)
+ return -EINVAL;
+
+ if (MISALIGNED_512(shift_size)) {
+ log_dbg(cd, "Shift size field has to be aligned to 512 bytes.");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int reenc_keyslot_update_needed(struct crypt_device *cd,
+ json_object *jobj_keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment)
+{
+ const char *type;
+ json_object *jobj_area, *jobj_type, *jobj;
+
+ if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area) ||
+ !json_object_object_get_ex(jobj_area, "type", &jobj_type) ||
+ !(type = json_object_get_string(jobj_type)))
+ return -EINVAL;
+
+ /*
+ * If no resilience mode change is requested and effective
+ * resilience mode is 'checksum' then check alignment matches
+ * stored checksum block size.
+ */
+ if (!params || !params->resilience) {
+ if (!strcmp(json_object_get_string(jobj_type), "checksum") ||
+ !strcmp(json_object_get_string(jobj_type), "datashift-checksum"))
+ return (json_object_object_get_ex(jobj_area, "sector_size", &jobj) ||
+ alignment != crypt_jobj_get_uint32(jobj));
+ return 0;
+ }
+
+ if (strcmp(params->resilience, type))
+ return 1;
+
+ if (!strcmp(type, "checksum") ||
+ !strcmp(type, "datashift-checksum")) {
+ if (!params->hash)
+ return -EINVAL;
+ if (!json_object_object_get_ex(jobj_area, "hash", &jobj) ||
+ strcmp(json_object_get_string(jobj), params->hash) ||
+ !json_object_object_get_ex(jobj_area, "sector_size", &jobj) ||
+ crypt_jobj_get_uint32(jobj) != alignment)
+ return 1;
+ }
+
+ if (!strncmp(type, "datashift", 9)) {
+ if (!json_object_object_get_ex(jobj_area, "shift_size", &jobj))
+ return -EINVAL;
+ if ((params->data_shift << SECTOR_SHIFT) != crypt_jobj_get_uint64(jobj))
+ return 1;
+ }
+
+ /* nothing to compare with 'none' and 'journal' */
+ return 0;
+}
+
+static int load_checksum_protection(struct crypt_device *cd,
+ json_object *jobj_area,
+ uint64_t area_length,
+ struct reenc_protection *rp)
+{
+ int r;
+ json_object *jobj_hash, *jobj_block_size;
+
+ if (!jobj_area || !rp ||
+ !json_object_object_get_ex(jobj_area, "hash", &jobj_hash) ||
+ !json_object_object_get_ex(jobj_area, "sector_size", &jobj_block_size))
+ return -EINVAL;
+
+ r = snprintf(rp->p.csum.hash, sizeof(rp->p.csum.hash), "%s", json_object_get_string(jobj_hash));
+ if (r < 0 || (size_t)r >= sizeof(rp->p.csum.hash))
+ return -EINVAL;
+
+ if (crypt_hash_init(&rp->p.csum.ch, rp->p.csum.hash)) {
+ log_err(cd, _("Hash algorithm %s is not available."), rp->p.csum.hash);
+ return -EINVAL;
+ }
+
+ r = crypt_hash_size(rp->p.csum.hash);
+ if (r <= 0) {
+ crypt_hash_destroy(rp->p.csum.ch);
+ rp->p.csum.ch = NULL;
+ log_dbg(cd, "Invalid hash size");
+ return -EINVAL;
+ }
+
+ rp->p.csum.hash_size = r;
+ rp->p.csum.block_size = crypt_jobj_get_uint32(jobj_block_size);
+ rp->p.csum.checksums_len = area_length;
+
+ rp->type = REENC_PROTECTION_CHECKSUM;
+ return 0;
+}
+
+static int reenc_keyslot_load_resilience_primary(struct crypt_device *cd,
+ const char *type,
+ json_object *jobj_area,
+ uint64_t area_length,
+ struct reenc_protection *rp)
+{
+ json_object *jobj;
+
+ if (!strcmp(type, "checksum")) {
+ log_dbg(cd, "Initializing checksum resilience mode.");
+ return load_checksum_protection(cd, jobj_area, area_length, rp);
+ } else if (!strcmp(type, "journal")) {
+ log_dbg(cd, "Initializing journal resilience mode.");
+ rp->type = REENC_PROTECTION_JOURNAL;
+ } else if (!strcmp(type, "none")) {
+ log_dbg(cd, "Initializing none resilience mode.");
+ rp->type = REENC_PROTECTION_NONE;
+ } else if (!strcmp(type, "datashift") ||
+ !strcmp(type, "datashift-checksum") ||
+ !strcmp(type, "datashift-journal")) {
+ log_dbg(cd, "Initializing datashift resilience mode.");
+ if (!json_object_object_get_ex(jobj_area, "shift_size", &jobj))
+ return -EINVAL;
+ rp->type = REENC_PROTECTION_DATASHIFT;
+ rp->p.ds.data_shift = crypt_jobj_get_uint64(jobj);
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int reenc_keyslot_load_resilience_secondary(struct crypt_device *cd,
+ const char *type,
+ json_object *jobj_area,
+ uint64_t area_length,
+ struct reenc_protection *rp)
+{
+ if (!strcmp(type, "datashift-checksum")) {
+ log_dbg(cd, "Initializing checksum resilience mode.");
+ return load_checksum_protection(cd, jobj_area, area_length, rp);
+ } else if (!strcmp(type, "datashift-journal")) {
+ log_dbg(cd, "Initializing journal resilience mode.");
+ rp->type = REENC_PROTECTION_JOURNAL;
+ } else
+ rp->type = REENC_PROTECTION_NOT_SET;
+
+ return 0;
+}
+
+static int reenc_keyslot_load_resilience(struct crypt_device *cd,
+ json_object *jobj_keyslot,
+ struct reenc_protection *rp,
+ bool primary)
+{
+ const char *type;
+ int r;
+ json_object *jobj_area, *jobj_type;
+ uint64_t dummy, area_length;
+
+ if (!rp || !json_object_object_get_ex(jobj_keyslot, "area", &jobj_area) ||
+ !json_object_object_get_ex(jobj_area, "type", &jobj_type))
+ return -EINVAL;
+
+ r = LUKS2_keyslot_jobj_area(jobj_keyslot, &dummy, &area_length);
+ if (r < 0)
+ return r;
+
+ type = json_object_get_string(jobj_type);
+ if (!type)
+ return -EINVAL;
+
+ if (primary)
+ return reenc_keyslot_load_resilience_primary(cd, type, jobj_area, area_length, rp);
+ else
+ return reenc_keyslot_load_resilience_secondary(cd, type, jobj_area, area_length, rp);
+}
+
+static bool reenc_keyslot_update_is_valid(struct crypt_device *cd,
+ json_object *jobj_area,
+ const struct crypt_params_reencrypt *params)
+{
+ const char *type;
+ json_object *jobj_type, *jobj;
+
+ if (!json_object_object_get_ex(jobj_area, "type", &jobj_type) ||
+ !(type = json_object_get_string(jobj_type)))
+ return false;
+
+ /* do not allow switch to/away from datashift resilience type */
+ if ((strcmp(params->resilience, "datashift") && !strcmp(type, "datashift")) ||
+ (!strcmp(params->resilience, "datashift") && strcmp(type, "datashift")))
+ return false;
+
+ /* do not allow switch to/away from datashift- resilience subvariants */
+ if ((strncmp(params->resilience, "datashift-", 10) &&
+ !strncmp(type, "datashift-", 10)) ||
+ (!strncmp(params->resilience, "datashift-", 10) &&
+ strncmp(type, "datashift-", 10)))
+ return false;
+
+ /* datashift value is also immutable */
+ if (!strncmp(type, "datashift", 9)) {
+ if (!json_object_object_get_ex(jobj_area, "shift_size", &jobj))
+ return false;
+ return (params->data_shift << SECTOR_SHIFT) == crypt_jobj_get_uint64(jobj);
+ }
+
+ return true;
+}
+
+static int reenc_keyslot_update(struct crypt_device *cd,
+ json_object *jobj_keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment)
+{
+ int r;
+ json_object *jobj_area, *jobj_area_new;
+ uint64_t area_offset, area_length;
+
+ if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area))
+ return -EINVAL;
+
+ r = LUKS2_keyslot_jobj_area(jobj_keyslot, &area_offset, &area_length);
+ if (r < 0)
+ return r;
+
+ if (!params || !params->resilience)
+ jobj_area_new = reencrypt_keyslot_area_jobj_update_block_size(cd, jobj_area, alignment);
+ else {
+ if (!reenc_keyslot_update_is_valid(cd, jobj_area, params)) {
+ log_err(cd, _("Invalid reencryption resilience mode change requested."));
+ return -EINVAL;
+ }
+
+ jobj_area_new = reencrypt_keyslot_area_jobj(cd, params, alignment,
+ area_offset, area_length);
+ }
+
+ if (!jobj_area_new)
+ return -EINVAL;
+
+ /* increase refcount for validation purposes */
+ json_object_get(jobj_area);
+
+ json_object_object_add(jobj_keyslot, "area", jobj_area_new);
+
+ r = reenc_keyslot_validate(cd, jobj_keyslot);
+ if (r) {
+ /* replace invalid object with previous valid one */
+ json_object_object_add(jobj_keyslot, "area", jobj_area);
+ return -EINVAL;
+ }
+
+ /* previous area object is no longer needed */
+ json_object_put(jobj_area);
+
+ return 0;
+}
+
+int LUKS2_keyslot_reencrypt_allocate(struct crypt_device *cd,
+ struct luks2_hdr *hdr,
+ int keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment)
+{
+ int r;
+
+ if (keyslot == CRYPT_ANY_SLOT)
+ return -EINVAL;
+
+ r = reenc_keyslot_alloc(cd, hdr, keyslot, params, alignment);
+ if (r < 0)
+ return r;
+
+ r = LUKS2_keyslot_priority_set(cd, hdr, keyslot, CRYPT_SLOT_PRIORITY_IGNORE, 0);
+ if (r < 0)
+ return r;
+
+ r = reenc_keyslot_validate(cd, LUKS2_get_keyslot_jobj(hdr, keyslot));
+ if (r) {
+ log_dbg(cd, "Keyslot validation failed.");
+ return r;
+ }
+
+ return 0;
+}
+
+int LUKS2_keyslot_reencrypt_update_needed(struct crypt_device *cd,
+ struct luks2_hdr *hdr,
+ int keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment)
+{
+ int r;
+ json_object *jobj_type, *jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot);
+
+ if (!jobj_keyslot ||
+ !json_object_object_get_ex(jobj_keyslot, "type", &jobj_type) ||
+ strcmp(json_object_get_string(jobj_type), "reencrypt"))
+ return -EINVAL;
+
+ r = reenc_keyslot_update_needed(cd, jobj_keyslot, params, alignment);
+ if (!r)
+ log_dbg(cd, "No update of reencrypt keyslot needed.");
+
+ return r;
+}
+
+int LUKS2_keyslot_reencrypt_update(struct crypt_device *cd,
+ struct luks2_hdr *hdr,
+ int keyslot,
+ const struct crypt_params_reencrypt *params,
+ size_t alignment,
+ struct volume_key *vks)
+{
+ int r;
+ uint8_t version;
+ uint64_t max_size, moved_segment_size;
+ json_object *jobj_type, *jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot);
+ struct reenc_protection check_rp = {};
+
+ if (!jobj_keyslot ||
+ !json_object_object_get_ex(jobj_keyslot, "type", &jobj_type) ||
+ strcmp(json_object_get_string(jobj_type), "reencrypt"))
+ return -EINVAL;
+
+ if (LUKS2_config_get_reencrypt_version(hdr, &version))
+ return -EINVAL;
+
+ /* verify existing reencryption metadata before updating */
+ r = LUKS2_reencrypt_digest_verify(cd, hdr, vks);
+ if (r < 0)
+ return r;
+
+ r = reenc_keyslot_update(cd, jobj_keyslot, params, alignment);
+ if (r < 0)
+ return r;
+
+ r = reenc_keyslot_load_resilience(cd, jobj_keyslot, &check_rp, false);
+ if (r < 0)
+ return r;
+
+ if (check_rp.type != REENC_PROTECTION_NOT_SET) {
+ r = LUKS2_reencrypt_max_hotzone_size(cd, hdr, &check_rp, keyslot, &max_size);
+ LUKS2_reencrypt_protection_erase(&check_rp);
+ if (r < 0)
+ return r;
+ moved_segment_size = json_segment_get_size(LUKS2_get_segment_by_flag(hdr, "backup-moved-segment"), 0);
+ if (!moved_segment_size)
+ return -EINVAL;
+ if (moved_segment_size > max_size) {
+ log_err(cd, _("Can not update resilience type. "
+ "New type only provides %" PRIu64 " bytes, "
+ "required space is: %" PRIu64 " bytes."),
+ max_size, moved_segment_size);
+ return -EINVAL;
+ }
+ }
+
+ r = LUKS2_keyslot_reencrypt_digest_create(cd, hdr, version, vks);
+ if (r < 0)
+ log_err(cd, _("Failed to refresh reencryption verification digest."));
+
+ return r ?: LUKS2_hdr_write(cd, hdr);
+}
+
+int LUKS2_keyslot_reencrypt_load(struct crypt_device *cd,
+ struct luks2_hdr *hdr,
+ int keyslot,
+ struct reenc_protection *rp,
+ bool primary)
+{
+ json_object *jobj_type, *jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot);
+
+ if (!jobj_keyslot ||
+ !json_object_object_get_ex(jobj_keyslot, "type", &jobj_type) ||
+ strcmp(json_object_get_string(jobj_type), "reencrypt"))
+ return -EINVAL;
+
+ return reenc_keyslot_load_resilience(cd, jobj_keyslot, rp, primary);
+}
+
+const keyslot_handler reenc_keyslot = {
+ .name = "reencrypt",
+ .open = reenc_keyslot_open,
+ .store = reenc_keyslot_store, /* initialization only or also per every chunk write */
+ .wipe = reenc_keyslot_wipe,
+ .dump = reenc_keyslot_dump,
+ .validate = reenc_keyslot_validate
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-07 10:21:59 +0000