diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/luks2/luks2_json_metadata.c | 1935 |
1 files changed, 1935 insertions, 0 deletions
diff --git a/lib/luks2/luks2_json_metadata.c b/lib/luks2/luks2_json_metadata.c new file mode 100644 index 0000000..de8d018 --- /dev/null +++ b/lib/luks2/luks2_json_metadata.c @@ -0,0 +1,1935 @@ +/* + * LUKS - Linux Unified Key Setup v2 + * + * Copyright (C) 2015-2019 Red Hat, Inc. All rights reserved. + * Copyright (C) 2015-2019 Milan Broz + * Copyright (C) 2015-2019 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" +#include "../integrity/integrity.h" +#include <assert.h> +#include <ctype.h> +#include <uuid/uuid.h> + +#define LUKS_STRIPES 4000 + +struct interval { + uint64_t offset; + uint64_t length; +}; + +void hexprint_base64(struct crypt_device *cd, json_object *jobj, + const char *sep, const char *line_sep) +{ + char *buf = NULL; + size_t buf_len; + unsigned int i; + + if (!base64_decode_alloc(json_object_get_string(jobj), + json_object_get_string_len(jobj), + &buf, &buf_len)) + return; + + for (i = 0; i < buf_len / 2; i++) + log_std(cd, "%02hhx%s", buf[i], sep); + log_std(cd, "\n\t%s", line_sep); + for (i = buf_len / 2; i < buf_len; i++) + log_std(cd, "%02hhx%s", buf[i], sep); + log_std(cd, "\n"); + free(buf); +} + +void JSON_DBG(struct crypt_device *cd, json_object *jobj, const char *desc) +{ + if (desc) + crypt_log(cd, CRYPT_LOG_DEBUG_JSON, desc); + crypt_log(cd, CRYPT_LOG_DEBUG_JSON, json_object_to_json_string_ext(jobj, + JSON_C_TO_STRING_PRETTY | JSON_C_TO_STRING_NOSLASHESCAPE)); +} + +/* + * JSON array helpers + */ +struct json_object *LUKS2_array_jobj(struct json_object *array, const char *num) +{ + struct json_object *jobj1; + int i; + + for (i = 0; i < (int) json_object_array_length(array); i++) { + jobj1 = json_object_array_get_idx(array, i); + if (!strcmp(num, json_object_get_string(jobj1))) + return jobj1; + } + + return NULL; +} + +struct json_object *LUKS2_array_remove(struct json_object *array, const char *num) +{ + struct json_object *jobj1, *jobj_removing = NULL, *array_new; + int i; + + jobj_removing = LUKS2_array_jobj(array, num); + if (!jobj_removing) + return NULL; + + /* Create new array without jobj_removing. */ + array_new = json_object_new_array(); + for (i = 0; i < (int) json_object_array_length(array); i++) { + jobj1 = json_object_array_get_idx(array, i); + if (jobj1 != jobj_removing) + json_object_array_add(array_new, json_object_get(jobj1)); + } + + return array_new; +} + +/* + * JSON struct access helpers + */ +json_object *LUKS2_get_keyslot_jobj(struct luks2_hdr *hdr, int keyslot) +{ + json_object *jobj1, *jobj2; + char keyslot_name[16]; + + if (!hdr || keyslot < 0) + return NULL; + + if (snprintf(keyslot_name, sizeof(keyslot_name), "%u", keyslot) < 1) + return NULL; + + if (!json_object_object_get_ex(hdr->jobj, "keyslots", &jobj1)) + return NULL; + + json_object_object_get_ex(jobj1, keyslot_name, &jobj2); + return jobj2; +} + +json_object *LUKS2_get_tokens_jobj(struct luks2_hdr *hdr) +{ + json_object *jobj_tokens; + + if (!hdr || !json_object_object_get_ex(hdr->jobj, "tokens", &jobj_tokens)) + return NULL; + + return jobj_tokens; +} + +json_object *LUKS2_get_token_jobj(struct luks2_hdr *hdr, int token) +{ + json_object *jobj1, *jobj2; + char token_name[16]; + + if (!hdr || token < 0) + return NULL; + + jobj1 = LUKS2_get_tokens_jobj(hdr); + if (!jobj1) + return NULL; + + if (snprintf(token_name, sizeof(token_name), "%u", token) < 1) + return NULL; + + json_object_object_get_ex(jobj1, token_name, &jobj2); + return jobj2; +} + +json_object *LUKS2_get_digest_jobj(struct luks2_hdr *hdr, int digest) +{ + json_object *jobj1, *jobj2; + char digest_name[16]; + + if (!hdr || digest < 0) + return NULL; + + if (snprintf(digest_name, sizeof(digest_name), "%u", digest) < 1) + return NULL; + + if (!json_object_object_get_ex(hdr->jobj, "digests", &jobj1)) + return NULL; + + json_object_object_get_ex(jobj1, digest_name, &jobj2); + return jobj2; +} + +json_object *LUKS2_get_segment_jobj(struct luks2_hdr *hdr, int segment) +{ + json_object *jobj1, *jobj2; + char segment_name[16]; + + if (!hdr || segment < 0) + return NULL; + + if (snprintf(segment_name, sizeof(segment_name), "%u", segment) < 1) + return NULL; + + if (!json_object_object_get_ex(hdr->jobj, "segments", &jobj1)) + return NULL; + + if (!json_object_object_get_ex(jobj1, segment_name, &jobj2)) + return NULL; + + return jobj2; +} + +/* + * json_type_int needs to be validated first. + * See validate_json_uint32() + */ +uint32_t json_object_get_uint32(json_object *jobj) +{ + return json_object_get_int64(jobj); +} + +/* jobj has to be json_type_string and numbered */ +static json_bool json_str_to_uint64(json_object *jobj, uint64_t *value) +{ + char *endptr; + unsigned long long tmp; + + errno = 0; + tmp = strtoull(json_object_get_string(jobj), &endptr, 10); + if (*endptr || errno) { + *value = 0; + return FALSE; + } + + *value = tmp; + return TRUE; +} + +uint64_t json_object_get_uint64(json_object *jobj) +{ + uint64_t r; + return json_str_to_uint64(jobj, &r) ? r : 0; +} + +json_object *json_object_new_uint64(uint64_t value) +{ + /* 18446744073709551615 */ + char num[21]; + int r; + json_object *jobj; + + r = snprintf(num, sizeof(num), "%" PRIu64, value); + if (r < 0 || (size_t)r >= sizeof(num)) + return NULL; + + jobj = json_object_new_string(num); + return jobj; +} + +/* + * Validate helpers + */ +static json_bool numbered(struct crypt_device *cd, const char *name, const char *key) +{ + int i; + + for (i = 0; key[i]; i++) + if (!isdigit(key[i])) { + log_dbg(cd, "%s \"%s\" is not in numbered form.", name, key); + return FALSE; + } + return TRUE; +} + +json_object *json_contains(struct crypt_device *cd, json_object *jobj, const char *name, + const char *section, const char *key, json_type type) +{ + json_object *sobj; + + if (!json_object_object_get_ex(jobj, key, &sobj) || + !json_object_is_type(sobj, type)) { + log_dbg(cd, "%s \"%s\" is missing \"%s\" (%s) specification.", + section, name, key, json_type_to_name(type)); + return NULL; + } + + return sobj; +} + +/* use only on already validated 'segments' object */ +static uint64_t get_first_data_offset(json_object *jobj_segs, const char *type) +{ + json_object *jobj_offset, *jobj_type; + uint64_t tmp, min = UINT64_MAX; + + json_object_object_foreach(jobj_segs, key, val) { + UNUSED(key); + + if (type) { + json_object_object_get_ex(val, "type", &jobj_type); + if (strcmp(type, json_object_get_string(jobj_type))) + continue; + } + + json_object_object_get_ex(val, "offset", &jobj_offset); + tmp = json_object_get_uint64(jobj_offset); + + if (!tmp) + return tmp; + + if (tmp < min) + min = tmp; + } + + return min; +} + +static json_bool validate_json_uint32(json_object *jobj) +{ + int64_t tmp; + + errno = 0; + tmp = json_object_get_int64(jobj); + + return (errno || tmp < 0 || tmp > UINT32_MAX) ? FALSE : TRUE; +} + +static json_bool validate_keyslots_array(struct crypt_device *cd, + json_object *jarr, json_object *jobj_keys) +{ + json_object *jobj; + int i = 0, length = (int) json_object_array_length(jarr); + + while (i < length) { + jobj = json_object_array_get_idx(jarr, i); + if (!json_object_is_type(jobj, json_type_string)) { + log_dbg(cd, "Illegal value type in keyslots array at index %d.", i); + return FALSE; + } + + if (!json_contains(cd, jobj_keys, "", "Keyslots section", + json_object_get_string(jobj), json_type_object)) + return FALSE; + + i++; + } + + return TRUE; +} + +static json_bool validate_segments_array(struct crypt_device *cd, + json_object *jarr, json_object *jobj_segments) +{ + json_object *jobj; + int i = 0, length = (int) json_object_array_length(jarr); + + while (i < length) { + jobj = json_object_array_get_idx(jarr, i); + if (!json_object_is_type(jobj, json_type_string)) { + log_dbg(cd, "Illegal value type in segments array at index %d.", i); + return FALSE; + } + + if (!json_contains(cd, jobj_segments, "", "Segments section", + json_object_get_string(jobj), json_type_object)) + return FALSE; + + i++; + } + + return TRUE; +} + +static json_bool segment_has_digest(const char *segment_name, json_object *jobj_digests) +{ + json_object *jobj_segments; + + json_object_object_foreach(jobj_digests, key, val) { + UNUSED(key); + json_object_object_get_ex(val, "segments", &jobj_segments); + if (LUKS2_array_jobj(jobj_segments, segment_name)) + return TRUE; + } + + return FALSE; +} + +static json_bool validate_intervals(struct crypt_device *cd, + int length, const struct interval *ix, + uint64_t metadata_size, uint64_t keyslots_area_end) +{ + int j, i = 0; + + while (i < length) { + if (ix[i].offset < 2 * metadata_size) { + log_dbg(cd, "Illegal area offset: %" PRIu64 ".", ix[i].offset); + return FALSE; + } + + if (!ix[i].length) { + log_dbg(cd, "Area length must be greater than zero."); + return FALSE; + } + + if ((ix[i].offset + ix[i].length) > keyslots_area_end) { + log_dbg(cd, "Area [%" PRIu64 ", %" PRIu64 "] overflows binary keyslots area (ends at offset: %" PRIu64 ").", + ix[i].offset, ix[i].offset + ix[i].length, keyslots_area_end); + return FALSE; + } + + for (j = 0; j < length; j++) { + if (i == j) + continue; + if ((ix[i].offset >= ix[j].offset) && (ix[i].offset < (ix[j].offset + ix[j].length))) { + log_dbg(cd, "Overlapping areas [%" PRIu64 ",%" PRIu64 "] and [%" PRIu64 ",%" PRIu64 "].", + ix[i].offset, ix[i].offset + ix[i].length, + ix[j].offset, ix[j].offset + ix[j].length); + return FALSE; + } + } + + i++; + } + + return TRUE; +} + +int LUKS2_keyslot_validate(struct crypt_device *cd, json_object *hdr_jobj, json_object *hdr_keyslot, const char *key) +{ + json_object *jobj_key_size; + + if (!json_contains(cd, hdr_keyslot, key, "Keyslot", "type", json_type_string)) + return 1; + if (!(jobj_key_size = json_contains(cd, hdr_keyslot, key, "Keyslot", "key_size", json_type_int))) + return 1; + + /* enforce uint32_t type */ + if (!validate_json_uint32(jobj_key_size)) { + log_dbg(cd, "Illegal field \"key_size\":%s.", + json_object_get_string(jobj_key_size)); + return 1; + } + + return 0; +} + +int LUKS2_token_validate(struct crypt_device *cd, + json_object *hdr_jobj, json_object *jobj_token, const char *key) +{ + json_object *jarr, *jobj_keyslots; + + /* keyslots are not yet validated, but we need to know token doesn't reference missing keyslot */ + if (!json_object_object_get_ex(hdr_jobj, "keyslots", &jobj_keyslots)) + return 1; + + if (!json_contains(cd, jobj_token, key, "Token", "type", json_type_string)) + return 1; + + jarr = json_contains(cd, jobj_token, key, "Token", "keyslots", json_type_array); + if (!jarr) + return 1; + + if (!validate_keyslots_array(cd, jarr, jobj_keyslots)) + return 1; + + return 0; +} + +static int hdr_validate_json_size(struct crypt_device *cd, json_object *hdr_jobj, uint64_t hdr_json_size) +{ + json_object *jobj, *jobj1; + const char *json; + uint64_t json_area_size, json_size; + + json_object_object_get_ex(hdr_jobj, "config", &jobj); + json_object_object_get_ex(jobj, "json_size", &jobj1); + + json = json_object_to_json_string_ext(hdr_jobj, + JSON_C_TO_STRING_PLAIN | JSON_C_TO_STRING_NOSLASHESCAPE); + json_area_size = json_object_get_uint64(jobj1); + json_size = (uint64_t)strlen(json); + + if (hdr_json_size != json_area_size) { + log_dbg(cd, "JSON area size doesn't match value in binary header."); + return 1; + } + + if (json_size > json_area_size) { + log_dbg(cd, "JSON doesn't fit in the designated area."); + return 1; + } + + return 0; +} + +int LUKS2_check_json_size(struct crypt_device *cd, const struct luks2_hdr *hdr) +{ + return hdr_validate_json_size(cd, hdr->jobj, hdr->hdr_size - LUKS2_HDR_BIN_LEN); +} + +static int hdr_validate_keyslots(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jobj; + + if (!json_object_object_get_ex(hdr_jobj, "keyslots", &jobj)) { + log_dbg(cd, "Missing keyslots section."); + return 1; + } + + json_object_object_foreach(jobj, key, val) { + if (!numbered(cd, "Keyslot", key)) + return 1; + if (LUKS2_keyslot_validate(cd, hdr_jobj, val, key)) + return 1; + } + + return 0; +} + +static int hdr_validate_tokens(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jobj; + + if (!json_object_object_get_ex(hdr_jobj, "tokens", &jobj)) { + log_dbg(cd, "Missing tokens section."); + return 1; + } + + json_object_object_foreach(jobj, key, val) { + if (!numbered(cd, "Token", key)) + return 1; + if (LUKS2_token_validate(cd, hdr_jobj, val, key)) + return 1; + } + + return 0; +} + +static int hdr_validate_crypt_segment(struct crypt_device *cd, + json_object *jobj, const char *key, json_object *jobj_digests, + uint64_t offset, uint64_t size) +{ + json_object *jobj_ivoffset, *jobj_sector_size, *jobj_integrity; + uint32_t sector_size; + uint64_t ivoffset; + + if (!(jobj_ivoffset = json_contains(cd, jobj, key, "Segment", "iv_tweak", json_type_string)) || + !json_contains(cd, jobj, key, "Segment", "encryption", json_type_string) || + !(jobj_sector_size = json_contains(cd, jobj, key, "Segment", "sector_size", json_type_int))) + return 1; + + /* integrity */ + if (json_object_object_get_ex(jobj, "integrity", &jobj_integrity)) { + if (!json_contains(cd, jobj, key, "Segment", "integrity", json_type_object) || + !json_contains(cd, jobj_integrity, key, "Segment integrity", "type", json_type_string) || + !json_contains(cd, jobj_integrity, key, "Segment integrity", "journal_encryption", json_type_string) || + !json_contains(cd, jobj_integrity, key, "Segment integrity", "journal_integrity", json_type_string)) + return 1; + } + + /* enforce uint32_t type */ + if (!validate_json_uint32(jobj_sector_size)) { + log_dbg(cd, "Illegal field \"sector_size\":%s.", + json_object_get_string(jobj_sector_size)); + return 1; + } + + sector_size = json_object_get_uint32(jobj_sector_size); + if (!sector_size || MISALIGNED_512(sector_size)) { + log_dbg(cd, "Illegal sector size: %" PRIu32, sector_size); + return 1; + } + + if (!numbered(cd, "iv_tweak", json_object_get_string(jobj_ivoffset)) || + !json_str_to_uint64(jobj_ivoffset, &ivoffset)) { + log_dbg(cd, "Illegal iv_tweak value."); + return 1; + } + + if (size % sector_size) { + log_dbg(cd, "Size field has to be aligned to sector size: %" PRIu32, sector_size); + return 1; + } + + return !segment_has_digest(key, jobj_digests); +} + +static int hdr_validate_segments(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jobj, *jobj_digests, *jobj_offset, *jobj_size, *jobj_type, *jobj_flags; + int i; + uint64_t offset, size; + + if (!json_object_object_get_ex(hdr_jobj, "segments", &jobj)) { + log_dbg(cd, "Missing segments section."); + return 1; + } + + if (json_object_object_length(jobj) < 1) { + log_dbg(cd, "Empty segments section."); + return 1; + } + + /* digests should already be validated */ + if (!json_object_object_get_ex(hdr_jobj, "digests", &jobj_digests)) + return 1; + + json_object_object_foreach(jobj, key, val) { + if (!numbered(cd, "Segment", key)) + return 1; + + /* those fields are mandatory for all segment types */ + if (!(jobj_type = json_contains(cd, val, key, "Segment", "type", json_type_string)) || + !(jobj_offset = json_contains(cd, val, key, "Segment", "offset", json_type_string)) || + !(jobj_size = json_contains(cd, val, key, "Segment", "size", json_type_string))) + return 1; + + if (!numbered(cd, "offset", json_object_get_string(jobj_offset)) || + !json_str_to_uint64(jobj_offset, &offset)) + return 1; + + /* size "dynamic" means whole device starting at 'offset' */ + if (strcmp(json_object_get_string(jobj_size), "dynamic")) { + if (!numbered(cd, "size", json_object_get_string(jobj_size)) || + !json_str_to_uint64(jobj_size, &size) || !size) + return 1; + } else + size = 0; + + /* all device-mapper devices are aligned to 512 sector size */ + if (MISALIGNED_512(offset)) { + log_dbg(cd, "Offset field has to be aligned to sector size: %" PRIu32, SECTOR_SIZE); + return 1; + } + if (MISALIGNED_512(size)) { + log_dbg(cd, "Size field has to be aligned to sector size: %" PRIu32, SECTOR_SIZE); + return 1; + } + + /* flags array is optional and must contain strings */ + if (json_object_object_get_ex(val, "flags", NULL)) { + if (!(jobj_flags = json_contains(cd, val, key, "Segment", "flags", json_type_array))) + return 1; + for (i = 0; i < (int) json_object_array_length(jobj_flags); i++) + if (!json_object_is_type(json_object_array_get_idx(jobj_flags, i), json_type_string)) + return 1; + } + + /* crypt */ + if (!strcmp(json_object_get_string(jobj_type), "crypt") && + hdr_validate_crypt_segment(cd, val, key, jobj_digests, offset, size)) + return 1; + } + + return 0; +} + +uint64_t LUKS2_metadata_size(json_object *jobj) +{ + json_object *jobj1, *jobj2; + uint64_t json_size; + + json_object_object_get_ex(jobj, "config", &jobj1); + json_object_object_get_ex(jobj1, "json_size", &jobj2); + json_str_to_uint64(jobj2, &json_size); + + return json_size + LUKS2_HDR_BIN_LEN; +} + +static int hdr_validate_areas(struct crypt_device *cd, json_object *hdr_jobj) +{ + struct interval *intervals; + json_object *jobj_keyslots, *jobj_offset, *jobj_length, *jobj_segments, *jobj_area; + int length, ret, i = 0; + uint64_t metadata_size; + + if (!json_object_object_get_ex(hdr_jobj, "keyslots", &jobj_keyslots)) + return 1; + + /* segments are already validated */ + if (!json_object_object_get_ex(hdr_jobj, "segments", &jobj_segments)) + return 1; + + /* config is already validated */ + metadata_size = LUKS2_metadata_size(hdr_jobj); + + length = json_object_object_length(jobj_keyslots); + + /* Empty section */ + if (length == 0) + return 0; + + if (length < 0) { + log_dbg(cd, "Invalid keyslot areas specification."); + return 1; + } + + intervals = malloc(length * sizeof(*intervals)); + if (!intervals) { + log_dbg(cd, "Not enough memory."); + return -ENOMEM; + } + + json_object_object_foreach(jobj_keyslots, key, val) { + + if (!(jobj_area = json_contains(cd, val, key, "Keyslot", "area", json_type_object)) || + !(jobj_offset = json_contains(cd, jobj_area, key, "Keyslot", "offset", json_type_string)) || + !(jobj_length = json_contains(cd, jobj_area, key, "Keyslot", "size", json_type_string)) || + !numbered(cd, "offset", json_object_get_string(jobj_offset)) || + !numbered(cd, "size", json_object_get_string(jobj_length))) { + free(intervals); + return 1; + } + + /* rule out values > UINT64_MAX */ + if (!json_str_to_uint64(jobj_offset, &intervals[i].offset) || + !json_str_to_uint64(jobj_length, &intervals[i].length)) { + free(intervals); + return 1; + } + + i++; + } + + if (length != i) { + free(intervals); + return 1; + } + + ret = validate_intervals(cd, length, intervals, metadata_size, LUKS2_hdr_and_areas_size(hdr_jobj)) ? 0 : 1; + + free(intervals); + + return ret; +} + +static int hdr_validate_digests(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jarr_keys, *jarr_segs, *jobj, *jobj_keyslots, *jobj_segments; + + if (!json_object_object_get_ex(hdr_jobj, "digests", &jobj)) { + log_dbg(cd, "Missing digests section."); + return 1; + } + + /* keyslots are not yet validated, but we need to know digest doesn't reference missing keyslot */ + if (!json_object_object_get_ex(hdr_jobj, "keyslots", &jobj_keyslots)) + return 1; + + /* segments are not yet validated, but we need to know digest doesn't reference missing segment */ + if (!json_object_object_get_ex(hdr_jobj, "segments", &jobj_segments)) + return 1; + + json_object_object_foreach(jobj, key, val) { + if (!numbered(cd, "Digest", key)) + return 1; + + if (!json_contains(cd, val, key, "Digest", "type", json_type_string) || + !(jarr_keys = json_contains(cd, val, key, "Digest", "keyslots", json_type_array)) || + !(jarr_segs = json_contains(cd, val, key, "Digest", "segments", json_type_array))) + return 1; + + if (!validate_keyslots_array(cd, jarr_keys, jobj_keyslots)) + return 1; + if (!validate_segments_array(cd, jarr_segs, jobj_segments)) + return 1; + } + + return 0; +} + +static int hdr_validate_config(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jobj_config, *jobj, *jobj1; + int i; + uint64_t keyslots_size, metadata_size, segment_offset; + + if (!json_object_object_get_ex(hdr_jobj, "config", &jobj_config)) { + log_dbg(cd, "Missing config section."); + return 1; + } + + if (!(jobj = json_contains(cd, jobj_config, "section", "Config", "json_size", json_type_string)) || + !json_str_to_uint64(jobj, &metadata_size)) + return 1; + + /* single metadata instance is assembled from json area size plus + * binary header size */ + metadata_size += LUKS2_HDR_BIN_LEN; + + if (!(jobj = json_contains(cd, jobj_config, "section", "Config", "keyslots_size", json_type_string)) || + !json_str_to_uint64(jobj, &keyslots_size)) + return 1; + + if (LUKS2_check_metadata_area_size(metadata_size)) { + log_dbg(cd, "Unsupported LUKS2 header size (%" PRIu64 ").", metadata_size); + return 1; + } + + if (LUKS2_check_keyslots_area_size(keyslots_size)) { + log_dbg(cd, "Unsupported LUKS2 keyslots size (%" PRIu64 ").", keyslots_size); + return 1; + } + + /* + * validate keyslots_size fits in between (2 * metadata_size) and first + * segment_offset (except detached header) + */ + json_object_object_get_ex(hdr_jobj, "segments", &jobj); + segment_offset = get_first_data_offset(jobj, "crypt"); + if (segment_offset && + (segment_offset < keyslots_size || + (segment_offset - keyslots_size) < (2 * metadata_size))) { + log_dbg(cd, "keyslots_size is too large %" PRIu64 " (bytes). Data offset: %" PRIu64 + ", keyslots offset: %" PRIu64, keyslots_size, segment_offset, 2 * metadata_size); + return 1; + } + + /* Flags array is optional */ + if (json_object_object_get_ex(jobj_config, "flags", &jobj)) { + if (!json_contains(cd, jobj_config, "section", "Config", "flags", json_type_array)) + return 1; + + /* All array members must be strings */ + for (i = 0; i < (int) json_object_array_length(jobj); i++) + if (!json_object_is_type(json_object_array_get_idx(jobj, i), json_type_string)) + return 1; + } + + /* Requirements object is optional */ + if (json_object_object_get_ex(jobj_config, "requirements", &jobj)) { + if (!json_contains(cd, jobj_config, "section", "Config", "requirements", json_type_object)) + return 1; + + /* Mandatory array is optional */ + if (json_object_object_get_ex(jobj, "mandatory", &jobj1)) { + if (!json_contains(cd, jobj, "section", "Requirements", "mandatory", json_type_array)) + return 1; + + /* All array members must be strings */ + for (i = 0; i < (int) json_object_array_length(jobj1); i++) + if (!json_object_is_type(json_object_array_get_idx(jobj1, i), json_type_string)) + return 1; + } + } + + return 0; +} + +int LUKS2_hdr_validate(struct crypt_device *cd, json_object *hdr_jobj, uint64_t json_size) +{ + struct { + int (*validate)(struct crypt_device *, json_object *); + } checks[] = { + { hdr_validate_tokens }, + { hdr_validate_digests }, + { hdr_validate_segments }, + { hdr_validate_keyslots }, + { hdr_validate_config }, + { hdr_validate_areas }, + { NULL } + }; + int i; + + if (!hdr_jobj) + return 1; + + for (i = 0; checks[i].validate; i++) + if (checks[i].validate && checks[i].validate(cd, hdr_jobj)) + return 1; + + if (hdr_validate_json_size(cd, hdr_jobj, json_size)) + return 1; + + /* validate keyslot implementations */ + if (LUKS2_keyslots_validate(cd, hdr_jobj)) + return 1; + + return 0; +} + +/* FIXME: should we expose do_recovery parameter explicitly? */ +int LUKS2_hdr_read(struct crypt_device *cd, struct luks2_hdr *hdr, int repair) +{ + int r; + + r = device_read_lock(cd, crypt_metadata_device(cd)); + if (r) { + log_err(cd, _("Failed to acquire read lock on device %s."), + device_path(crypt_metadata_device(cd))); + return r; + } + + r = LUKS2_disk_hdr_read(cd, hdr, crypt_metadata_device(cd), 1, !repair); + if (r == -EAGAIN) { + /* unlikely: auto-recovery is required and failed due to read lock being held */ + device_read_unlock(cd, crypt_metadata_device(cd)); + + r = device_write_lock(cd, crypt_metadata_device(cd)); + if (r) { + log_err(cd, _("Failed to acquire write lock on device %s."), + device_path(crypt_metadata_device(cd))); + return r; + } + + r = LUKS2_disk_hdr_read(cd, hdr, crypt_metadata_device(cd), 1, !repair); + + device_write_unlock(cd, crypt_metadata_device(cd)); + } else + device_read_unlock(cd, crypt_metadata_device(cd)); + + return r; +} + +int LUKS2_hdr_write(struct crypt_device *cd, struct luks2_hdr *hdr) +{ + /* NOTE: is called before LUKS2 validation routines */ + /* erase unused digests (no assigned keyslot or segment) */ + LUKS2_digests_erase_unused(cd, hdr); + + if (LUKS2_hdr_validate(cd, hdr->jobj, hdr->hdr_size - LUKS2_HDR_BIN_LEN)) + return -EINVAL; + + return LUKS2_disk_hdr_write(cd, hdr, crypt_metadata_device(cd)); +} + +int LUKS2_hdr_uuid(struct crypt_device *cd, struct luks2_hdr *hdr, const char *uuid) +{ + uuid_t partitionUuid; + + if (uuid && uuid_parse(uuid, partitionUuid) == -1) { + log_err(cd, _("Wrong LUKS UUID format provided.")); + return -EINVAL; + } + if (!uuid) + uuid_generate(partitionUuid); + + uuid_unparse(partitionUuid, hdr->uuid); + + return LUKS2_hdr_write(cd, hdr); +} + +int LUKS2_hdr_labels(struct crypt_device *cd, struct luks2_hdr *hdr, + const char *label, const char *subsystem, int commit) +{ + //FIXME: check if the labels are the same and skip this. + + memset(hdr->label, 0, LUKS2_LABEL_L); + if (label) + strncpy(hdr->label, label, LUKS2_LABEL_L-1); + + memset(hdr->subsystem, 0, LUKS2_LABEL_L); + if (subsystem) + strncpy(hdr->subsystem, subsystem, LUKS2_LABEL_L-1); + + return commit ? LUKS2_hdr_write(cd, hdr) : 0; +} + +void LUKS2_hdr_free(struct crypt_device *cd, struct luks2_hdr *hdr) +{ + if (json_object_put(hdr->jobj)) + hdr->jobj = NULL; + else if (hdr->jobj) + log_dbg(cd, "LUKS2 header still in use"); +} + +uint64_t LUKS2_keyslots_size(json_object *jobj) +{ + json_object *jobj1, *jobj2; + uint64_t keyslots_size; + + json_object_object_get_ex(jobj, "config", &jobj1); + json_object_object_get_ex(jobj1, "keyslots_size", &jobj2); + json_str_to_uint64(jobj2, &keyslots_size); + + return keyslots_size; +} + +uint64_t LUKS2_hdr_and_areas_size(json_object *jobj) +{ + return 2 * LUKS2_metadata_size(jobj) + LUKS2_keyslots_size(jobj); +} + +int LUKS2_hdr_backup(struct crypt_device *cd, struct luks2_hdr *hdr, + const char *backup_file) +{ + struct device *device = crypt_metadata_device(cd); + int r = 0, devfd = -1; + ssize_t hdr_size; + ssize_t buffer_size; + char *buffer = NULL; + + hdr_size = LUKS2_hdr_and_areas_size(hdr->jobj); + buffer_size = size_round_up(hdr_size, crypt_getpagesize()); + + buffer = crypt_safe_alloc(buffer_size); + if (!buffer) + return -ENOMEM; + + log_dbg(cd, "Storing backup of header (%zu bytes).", hdr_size); + log_dbg(cd, "Output backup file size: %zu bytes.", buffer_size); + + r = device_read_lock(cd, device); + if (r) { + log_err(cd, _("Failed to acquire read lock on device %s."), + device_path(crypt_metadata_device(cd))); + crypt_safe_free(buffer); + return r; + } + + devfd = device_open_locked(cd, device, O_RDONLY); + if (devfd < 0) { + device_read_unlock(cd, device); + log_err(cd, _("Device %s is not a valid LUKS device."), device_path(device)); + crypt_safe_free(buffer); + return devfd == -1 ? -EINVAL : devfd; + } + + if (read_blockwise(devfd, device_block_size(cd, device), + device_alignment(device), buffer, hdr_size) < hdr_size) { + close(devfd); + device_read_unlock(cd, device); + crypt_safe_free(buffer); + return -EIO; + } + close(devfd); + + device_read_unlock(cd, device); + + devfd = open(backup_file, O_CREAT|O_EXCL|O_WRONLY, S_IRUSR); + if (devfd == -1) { + if (errno == EEXIST) + log_err(cd, _("Requested header backup file %s already exists."), backup_file); + else + log_err(cd, _("Cannot create header backup file %s."), backup_file); + crypt_safe_free(buffer); + return -EINVAL; + } + if (write_buffer(devfd, buffer, buffer_size) < buffer_size) { + log_err(cd, _("Cannot write header backup file %s."), backup_file); + r = -EIO; + } else + r = 0; + + close(devfd); + crypt_safe_free(buffer); + return r; +} + +static int reqs_unknown(uint32_t reqs) +{ + return reqs & CRYPT_REQUIREMENT_UNKNOWN; +} + +static int reqs_reencrypt(uint32_t reqs) +{ + return reqs & CRYPT_REQUIREMENT_OFFLINE_REENCRYPT; +} + +int LUKS2_hdr_restore(struct crypt_device *cd, struct luks2_hdr *hdr, + const char *backup_file) +{ + struct device *backup_device, *device = crypt_metadata_device(cd); + int r, devfd = -1, diff_uuid = 0; + ssize_t buffer_size = 0; + char *buffer = NULL, msg[1024]; + struct luks2_hdr hdr_file; + struct luks2_hdr tmp_hdr = {}; + uint32_t reqs = 0; + + r = device_alloc(cd, &backup_device, backup_file); + if (r < 0) + return r; + + /* FIXME: why lock backup device ? */ + r = device_read_lock(cd, backup_device); + if (r) { + log_err(cd, _("Failed to acquire read lock on device %s."), + device_path(backup_device)); + device_free(cd, backup_device); + return r; + } + + r = LUKS2_disk_hdr_read(cd, &hdr_file, backup_device, 0, 0); + device_read_unlock(cd, backup_device); + device_free(cd, backup_device); + + if (r < 0) { + log_err(cd, _("Backup file doesn't contain valid LUKS header.")); + goto out; + } + + /* do not allow header restore from backup with unmet requirements */ + if (LUKS2_unmet_requirements(cd, &hdr_file, 0, 1)) { + log_err(cd, _("Forbidden LUKS2 requirements detected in backup %s."), + backup_file); + r = -ETXTBSY; + goto out; + } + + buffer_size = LUKS2_hdr_and_areas_size(hdr_file.jobj); + buffer = crypt_safe_alloc(buffer_size); + if (!buffer) { + r = -ENOMEM; + goto out; + } + + devfd = open(backup_file, O_RDONLY); + if (devfd == -1) { + log_err(cd, _("Cannot open header backup file %s."), backup_file); + r = -EINVAL; + goto out; + } + + if (read_buffer(devfd, buffer, buffer_size) < buffer_size) { + log_err(cd, _("Cannot read header backup file %s."), backup_file); + r = -EIO; + goto out; + } + close(devfd); + devfd = -1; + + r = LUKS2_hdr_read(cd, &tmp_hdr, 0); + if (r == 0) { + log_dbg(cd, "Device %s already contains LUKS2 header, checking UUID and requirements.", device_path(device)); + r = LUKS2_config_get_requirements(cd, &tmp_hdr, &reqs); + if (r) + goto out; + + if (memcmp(tmp_hdr.uuid, hdr_file.uuid, LUKS2_UUID_L)) + diff_uuid = 1; + + if (!reqs_reencrypt(reqs)) { + log_dbg(cd, "Checking LUKS2 header size and offsets."); + if (LUKS2_get_data_offset(&tmp_hdr) != LUKS2_get_data_offset(&hdr_file)) { + log_err(cd, _("Data offset differ on device and backup, restore failed.")); + r = -EINVAL; + goto out; + } + /* FIXME: what could go wrong? Erase if we're fine with consequences */ + if (buffer_size != (ssize_t) LUKS2_hdr_and_areas_size(tmp_hdr.jobj)) { + log_err(cd, _("Binary header with keyslot areas size differ on device and backup, restore failed.")); + r = -EINVAL; + goto out; + } + } + } + + r = snprintf(msg, sizeof(msg), _("Device %s %s%s%s%s"), device_path(device), + r ? _("does not contain LUKS2 header. Replacing header can destroy data on that device.") : + _("already contains LUKS2 header. Replacing header will destroy existing keyslots."), + diff_uuid ? _("\nWARNING: real device header has different UUID than backup!") : "", + reqs_unknown(reqs) ? _("\nWARNING: unknown LUKS2 requirements detected in real device header!" + "\nReplacing header with backup may corrupt the data on that device!") : "", + reqs_reencrypt(reqs) ? _("\nWARNING: Unfinished offline reencryption detected on the device!" + "\nReplacing header with backup may corrupt data.") : ""); + if (r < 0 || (size_t) r >= sizeof(msg)) { + r = -ENOMEM; + goto out; + } + + if (!crypt_confirm(cd, msg)) { + r = -EINVAL; + goto out; + } + + log_dbg(cd, "Storing backup of header (%zu bytes) to device %s.", buffer_size, device_path(device)); + + /* TODO: perform header restore on bdev in stand-alone routine? */ + r = device_write_lock(cd, device); + if (r) { + log_err(cd, _("Failed to acquire write lock on device %s."), + device_path(device)); + goto out; + } + + devfd = device_open_locked(cd, device, O_RDWR); + if (devfd < 0) { + if (errno == EACCES) + log_err(cd, _("Cannot write to device %s, permission denied."), + device_path(device)); + else + log_err(cd, _("Cannot open device %s."), device_path(device)); + device_write_unlock(cd, device); + r = -EINVAL; + goto out; + } + + if (write_blockwise(devfd, device_block_size(cd, device), + device_alignment(device), buffer, buffer_size) < buffer_size) + r = -EIO; + else + r = 0; + + device_write_unlock(cd, device); + /* end of TODO */ + +out: + LUKS2_hdr_free(cd, hdr); + LUKS2_hdr_free(cd, &hdr_file); + LUKS2_hdr_free(cd, &tmp_hdr); + crypt_memzero(&hdr_file, sizeof(hdr_file)); + crypt_memzero(&tmp_hdr, sizeof(tmp_hdr)); + crypt_safe_free(buffer); + + if (devfd >= 0) { + device_sync(cd, device, devfd); + close(devfd); + } + + + return r; +} + +/* + * Persistent config flags + */ +static const struct { + uint32_t flag; + const char *description; +} persistent_flags[] = { + { CRYPT_ACTIVATE_ALLOW_DISCARDS, "allow-discards" }, + { CRYPT_ACTIVATE_SAME_CPU_CRYPT, "same-cpu-crypt" }, + { CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS, "submit-from-crypt-cpus" }, + { CRYPT_ACTIVATE_NO_JOURNAL, "no-journal" }, + { 0, NULL } +}; + +int LUKS2_config_get_flags(struct crypt_device *cd, struct luks2_hdr *hdr, uint32_t *flags) +{ + json_object *jobj1, *jobj_config, *jobj_flags; + int i, j, found; + + if (!hdr || !flags) + return -EINVAL; + + *flags = 0; + + if (!json_object_object_get_ex(hdr->jobj, "config", &jobj_config)) + return 0; + + if (!json_object_object_get_ex(jobj_config, "flags", &jobj_flags)) + return 0; + + for (i = 0; i < (int) json_object_array_length(jobj_flags); i++) { + jobj1 = json_object_array_get_idx(jobj_flags, i); + found = 0; + for (j = 0; persistent_flags[j].description && !found; j++) + if (!strcmp(persistent_flags[j].description, + json_object_get_string(jobj1))) { + *flags |= persistent_flags[j].flag; + log_dbg(cd, "Using persistent flag %s.", + json_object_get_string(jobj1)); + found = 1; + } + if (!found) + log_verbose(cd, _("Ignored unknown flag %s."), + json_object_get_string(jobj1)); + } + + return 0; +} + +int LUKS2_config_set_flags(struct crypt_device *cd, struct luks2_hdr *hdr, uint32_t flags) +{ + json_object *jobj_config, *jobj_flags; + int i; + + if (!json_object_object_get_ex(hdr->jobj, "config", &jobj_config)) + return 0; + + jobj_flags = json_object_new_array(); + + for (i = 0; persistent_flags[i].description; i++) { + if (flags & persistent_flags[i].flag) { + log_dbg(cd, "Setting persistent flag: %s.", persistent_flags[i].description); + json_object_array_add(jobj_flags, + json_object_new_string(persistent_flags[i].description)); + } + } + + /* Replace or add new flags array */ + json_object_object_add(jobj_config, "flags", jobj_flags); + + return LUKS2_hdr_write(cd, hdr); +} + +/* + * json format example (mandatory array must not be ignored, + * all other future fields may be added later) + * + * "requirements": { + * mandatory : [], + * optional0 : [], + * optional1 : "lala" + * } + */ + +/* LUKS2 library requirements */ +static const struct { + uint32_t flag; + const char *description; +} requirements_flags[] = { + { CRYPT_REQUIREMENT_OFFLINE_REENCRYPT, "offline-reencrypt" }, + { 0, NULL } +}; + +static uint32_t get_requirement_by_name(const char *requirement) +{ + int i; + + for (i = 0; requirements_flags[i].description; i++) + if (!strcmp(requirement, requirements_flags[i].description)) + return requirements_flags[i].flag; + + return CRYPT_REQUIREMENT_UNKNOWN; +} + +/* + * returns count of requirements (past cryptsetup 2.0 release) + */ +int LUKS2_config_get_requirements(struct crypt_device *cd, struct luks2_hdr *hdr, uint32_t *reqs) +{ + json_object *jobj_config, *jobj_requirements, *jobj_mandatory, *jobj; + int i, len; + uint32_t req; + + assert(hdr); + if (!hdr || !reqs) + return -EINVAL; + + *reqs = 0; + + if (!json_object_object_get_ex(hdr->jobj, "config", &jobj_config)) + return 0; + + if (!json_object_object_get_ex(jobj_config, "requirements", &jobj_requirements)) + return 0; + + if (!json_object_object_get_ex(jobj_requirements, "mandatory", &jobj_mandatory)) + return 0; + + len = (int) json_object_array_length(jobj_mandatory); + if (len <= 0) + return 0; + + log_dbg(cd, "LUKS2 requirements detected:"); + + for (i = 0; i < len; i++) { + jobj = json_object_array_get_idx(jobj_mandatory, i); + req = get_requirement_by_name(json_object_get_string(jobj)); + log_dbg(cd, "%s - %sknown", json_object_get_string(jobj), + reqs_unknown(req) ? "un" : ""); + *reqs |= req; + } + + return 0; +} + +int LUKS2_config_set_requirements(struct crypt_device *cd, struct luks2_hdr *hdr, uint32_t reqs) +{ + json_object *jobj_config, *jobj_requirements, *jobj_mandatory, *jobj; + int i, r = -EINVAL; + + if (!hdr) + return -EINVAL; + + jobj_mandatory = json_object_new_array(); + if (!jobj_mandatory) + return -ENOMEM; + + for (i = 0; requirements_flags[i].description; i++) { + if (reqs & requirements_flags[i].flag) { + jobj = json_object_new_string(requirements_flags[i].description); + if (!jobj) { + r = -ENOMEM; + goto err; + } + json_object_array_add(jobj_mandatory, jobj); + /* erase processed flag from input set */ + reqs &= ~(requirements_flags[i].flag); + } + } + + /* any remaining bit in requirements is unknown therefore illegal */ + if (reqs) { + log_dbg(cd, "Illegal requirement flag(s) requested"); + goto err; + } + + if (!json_object_object_get_ex(hdr->jobj, "config", &jobj_config)) + goto err; + + if (!json_object_object_get_ex(jobj_config, "requirements", &jobj_requirements)) { + jobj_requirements = json_object_new_object(); + if (!jobj_requirements) { + r = -ENOMEM; + goto err; + } + json_object_object_add(jobj_config, "requirements", jobj_requirements); + } + + if (json_object_array_length(jobj_mandatory) > 0) { + /* replace mandatory field with new values */ + json_object_object_add(jobj_requirements, "mandatory", jobj_mandatory); + } else { + /* new mandatory field was empty, delete old one */ + json_object_object_del(jobj_requirements, "mandatory"); + json_object_put(jobj_mandatory); + } + + /* remove empty requirements object */ + if (!json_object_object_length(jobj_requirements)) + json_object_object_del(jobj_config, "requirements"); + + return LUKS2_hdr_write(cd, hdr); +err: + json_object_put(jobj_mandatory); + return r; +} + +/* + * Header dump + */ +static void hdr_dump_config(struct crypt_device *cd, json_object *hdr_jobj) +{ + + json_object *jobj1, *jobj_config, *jobj_flags, *jobj_requirements, *jobj_mandatory; + int i = 0, flags = 0, reqs = 0; + + log_std(cd, "Flags: \t"); + + if (json_object_object_get_ex(hdr_jobj, "config", &jobj_config)) { + if (json_object_object_get_ex(jobj_config, "flags", &jobj_flags)) + flags = (int) json_object_array_length(jobj_flags); + if (json_object_object_get_ex(jobj_config, "requirements", &jobj_requirements) && + json_object_object_get_ex(jobj_requirements, "mandatory", &jobj_mandatory)) + reqs = (int) json_object_array_length(jobj_mandatory); + } + + for (i = 0; i < flags; i++) { + jobj1 = json_object_array_get_idx(jobj_flags, i); + log_std(cd, "%s ", json_object_get_string(jobj1)); + } + + log_std(cd, "%s\n%s", flags > 0 ? "" : "(no flags)", reqs > 0 ? "" : "\n"); + + if (reqs > 0) { + log_std(cd, "Requirements:\t"); + for (i = 0; i < reqs; i++) { + jobj1 = json_object_array_get_idx(jobj_mandatory, i); + log_std(cd, "%s ", json_object_get_string(jobj1)); + } + log_std(cd, "\n\n"); + } +} + +static const char *get_priority_desc(json_object *jobj) +{ + crypt_keyslot_priority priority; + json_object *jobj_priority; + const char *text; + + if (json_object_object_get_ex(jobj, "priority", &jobj_priority)) + priority = (crypt_keyslot_priority)(int)json_object_get_int(jobj_priority); + else + priority = CRYPT_SLOT_PRIORITY_NORMAL; + + switch (priority) { + case CRYPT_SLOT_PRIORITY_IGNORE: text = "ignored"; break; + case CRYPT_SLOT_PRIORITY_PREFER: text = "preferred"; break; + case CRYPT_SLOT_PRIORITY_NORMAL: text = "normal"; break; + default: text = "invalid"; + } + + return text; +} + +static void hdr_dump_keyslots(struct crypt_device *cd, json_object *hdr_jobj) +{ + char slot[16]; + json_object *keyslots_jobj, *digests_jobj, *jobj2, *jobj3, *val; + const char *tmps; + int i, j, r; + + log_std(cd, "Keyslots:\n"); + json_object_object_get_ex(hdr_jobj, "keyslots", &keyslots_jobj); + + for (j = 0; j < LUKS2_KEYSLOTS_MAX; j++) { + (void) snprintf(slot, sizeof(slot), "%i", j); + json_object_object_get_ex(keyslots_jobj, slot, &val); + if (!val) + continue; + + json_object_object_get_ex(val, "type", &jobj2); + tmps = json_object_get_string(jobj2); + + r = LUKS2_keyslot_for_segment(crypt_get_hdr(cd, CRYPT_LUKS2), j, CRYPT_DEFAULT_SEGMENT); + log_std(cd, " %s: %s%s\n", slot, tmps, r == -ENOENT ? " (unbound)" : ""); + + if (json_object_object_get_ex(val, "key_size", &jobj2)) + log_std(cd, "\tKey: %u bits\n", json_object_get_uint32(jobj2) * 8); + + log_std(cd, "\tPriority: %s\n", get_priority_desc(val)); + + LUKS2_keyslot_dump(cd, j); + + json_object_object_get_ex(hdr_jobj, "digests", &digests_jobj); + json_object_object_foreach(digests_jobj, key2, val2) { + json_object_object_get_ex(val2, "keyslots", &jobj2); + for (i = 0; i < (int) json_object_array_length(jobj2); i++) { + jobj3 = json_object_array_get_idx(jobj2, i); + if (!strcmp(slot, json_object_get_string(jobj3))) { + log_std(cd, "\tDigest ID: %s\n", key2); + } + } + } + } +} + +static void hdr_dump_tokens(struct crypt_device *cd, json_object *hdr_jobj) +{ + char token[16]; + json_object *tokens_jobj, *jobj2, *jobj3, *val; + const char *tmps; + int i, j; + + log_std(cd, "Tokens:\n"); + json_object_object_get_ex(hdr_jobj, "tokens", &tokens_jobj); + + for (j = 0; j < LUKS2_TOKENS_MAX; j++) { + (void) snprintf(token, sizeof(token), "%i", j); + json_object_object_get_ex(tokens_jobj, token, &val); + if (!val) + continue; + + json_object_object_get_ex(val, "type", &jobj2); + tmps = json_object_get_string(jobj2); + log_std(cd, " %s: %s\n", token, tmps); + + LUKS2_token_dump(cd, j); + + json_object_object_get_ex(val, "keyslots", &jobj2); + for (i = 0; i < (int) json_object_array_length(jobj2); i++) { + jobj3 = json_object_array_get_idx(jobj2, i); + log_std(cd, "\tKeyslot: %s\n", json_object_get_string(jobj3)); + } + } +} + +static void hdr_dump_segments(struct crypt_device *cd, json_object *hdr_jobj) +{ + char segment[16]; + json_object *jobj_segments, *jobj_segment, *jobj1, *jobj2; + int i, j, flags; + uint64_t value; + + log_std(cd, "Data segments:\n"); + json_object_object_get_ex(hdr_jobj, "segments", &jobj_segments); + + for (i = 0; i < LUKS2_SEGMENT_MAX; i++) { + (void) snprintf(segment, sizeof(segment), "%i", i); + if (!json_object_object_get_ex(jobj_segments, segment, &jobj_segment)) + continue; + + json_object_object_get_ex(jobj_segment, "type", &jobj1); + log_std(cd, " %s: %s\n", segment, json_object_get_string(jobj1)); + + json_object_object_get_ex(jobj_segment, "offset", &jobj1); + json_str_to_uint64(jobj1, &value); + log_std(cd, "\toffset: %" PRIu64 " [bytes]\n", value); + + json_object_object_get_ex(jobj_segment, "size", &jobj1); + if (!(strcmp(json_object_get_string(jobj1), "dynamic"))) + log_std(cd, "\tlength: (whole device)\n"); + else { + json_str_to_uint64(jobj1, &value); + log_std(cd, "\tlength: %" PRIu64 " [bytes]\n", value); + } + + if (json_object_object_get_ex(jobj_segment, "encryption", &jobj1)) + log_std(cd, "\tcipher: %s\n", json_object_get_string(jobj1)); + + if (json_object_object_get_ex(jobj_segment, "sector_size", &jobj1)) + log_std(cd, "\tsector: %" PRIu32 " [bytes]\n", json_object_get_uint32(jobj1)); + + if (json_object_object_get_ex(jobj_segment, "integrity", &jobj1) && + json_object_object_get_ex(jobj1, "type", &jobj2)) + log_std(cd, "\tintegrity: %s\n", json_object_get_string(jobj2)); + + if (json_object_object_get_ex(jobj_segment, "flags", &jobj1) && + (flags = (int)json_object_array_length(jobj1)) > 0) { + jobj2 = json_object_array_get_idx(jobj1, 0); + log_std(cd, "\tflags : %s", json_object_get_string(jobj2)); + for (j = 1; j < flags; j++) { + jobj2 = json_object_array_get_idx(jobj1, j); + log_std(cd, ", %s", json_object_get_string(jobj2)); + } + log_std(cd, "\n"); + } + + log_std(cd, "\n"); + } +} + +static void hdr_dump_digests(struct crypt_device *cd, json_object *hdr_jobj) +{ + char key[16]; + json_object *jobj1, *jobj2, *val; + const char *tmps; + int i; + + log_std(cd, "Digests:\n"); + json_object_object_get_ex(hdr_jobj, "digests", &jobj1); + + for (i = 0; i < LUKS2_DIGEST_MAX; i++) { + (void) snprintf(key, sizeof(key), "%i", i); + json_object_object_get_ex(jobj1, key, &val); + if (!val) + continue; + + json_object_object_get_ex(val, "type", &jobj2); + tmps = json_object_get_string(jobj2); + log_std(cd, " %s: %s\n", key, tmps); + + LUKS2_digest_dump(cd, i); + } +} + +int LUKS2_hdr_dump(struct crypt_device *cd, struct luks2_hdr *hdr) +{ + if (!hdr->jobj) + return -EINVAL; + + JSON_DBG(cd, hdr->jobj, NULL); + + log_std(cd, "LUKS header information\n"); + log_std(cd, "Version: \t%u\n", hdr->version); + log_std(cd, "Epoch: \t%" PRIu64 "\n", hdr->seqid); + log_std(cd, "Metadata area: \t%" PRIu64 " [bytes]\n", LUKS2_metadata_size(hdr->jobj)); + log_std(cd, "Keyslots area: \t%" PRIu64 " [bytes]\n", LUKS2_keyslots_size(hdr->jobj)); + log_std(cd, "UUID: \t%s\n", *hdr->uuid ? hdr->uuid : "(no UUID)"); + log_std(cd, "Label: \t%s\n", *hdr->label ? hdr->label : "(no label)"); + log_std(cd, "Subsystem: \t%s\n", *hdr->subsystem ? hdr->subsystem : "(no subsystem)"); + + hdr_dump_config(cd, hdr->jobj); + hdr_dump_segments(cd, hdr->jobj); + hdr_dump_keyslots(cd, hdr->jobj); + hdr_dump_tokens(cd, hdr->jobj); + hdr_dump_digests(cd, hdr->jobj); + + return 0; +} + +uint64_t LUKS2_get_data_offset(struct luks2_hdr *hdr) +{ + json_object *jobj1; + + if (!json_object_object_get_ex(hdr->jobj, "segments", &jobj1)) + return 0; + + return get_first_data_offset(jobj1, "crypt") / SECTOR_SIZE; +} + +const char *LUKS2_get_cipher(struct luks2_hdr *hdr, int segment) +{ + json_object *jobj1, *jobj2, *jobj3; + char buf[16]; + + if (segment < 0 || snprintf(buf, sizeof(buf), "%u", segment) < 1) + return NULL; + + if (!json_object_object_get_ex(hdr->jobj, "segments", &jobj1)) + return NULL; + + if (!json_object_object_get_ex(jobj1, buf, &jobj2)) + return NULL; + + if (json_object_object_get_ex(jobj2, "encryption", &jobj3)) + return json_object_get_string(jobj3); + + /* FIXME: default encryption (for other segment types) must be string here. */ + return "null"; + +} + +const char *LUKS2_get_keyslot_cipher(struct luks2_hdr *hdr, int keyslot, size_t *key_size) +{ + json_object *jobj_keyslot, *jobj_area, *jobj1; + + jobj_keyslot = LUKS2_get_keyslot_jobj(hdr, keyslot); + if (!jobj_keyslot) + return NULL; + + if (!json_object_object_get_ex(jobj_keyslot, "area", &jobj_area)) + return NULL; + + /* currently we only support raw length preserving area encryption */ + json_object_object_get_ex(jobj_area, "type", &jobj1); + if (strcmp(json_object_get_string(jobj1), "raw")) + return NULL; + + if (!json_object_object_get_ex(jobj_area, "key_size", &jobj1)) + return NULL; + *key_size = json_object_get_int(jobj1); + + if (!json_object_object_get_ex(jobj_area, "encryption", &jobj1)) + return NULL; + + return json_object_get_string(jobj1); +} + +const char *LUKS2_get_integrity(struct luks2_hdr *hdr, int segment) +{ + json_object *jobj1, *jobj2, *jobj3, *jobj4; + char buf[16]; + + if (segment < 0 || snprintf(buf, sizeof(buf), "%u", segment) < 1) + return NULL; + + if (!json_object_object_get_ex(hdr->jobj, "segments", &jobj1)) + return NULL; + + if (!json_object_object_get_ex(jobj1, buf, &jobj2)) + return NULL; + + if (!json_object_object_get_ex(jobj2, "integrity", &jobj3)) + return NULL; + + if (!json_object_object_get_ex(jobj3, "type", &jobj4)) + return NULL; + + return json_object_get_string(jobj4); +} + +/* FIXME: this only ensures that once we have journal encryption, it is not ignored. */ +static int LUKS2_integrity_compatible(struct luks2_hdr *hdr) +{ + json_object *jobj1, *jobj2, *jobj3, *jobj4; + const char *str; + + if (!json_object_object_get_ex(hdr->jobj, "segments", &jobj1)) + return 0; + + if (!json_object_object_get_ex(jobj1, CRYPT_DEFAULT_SEGMENT_STR, &jobj2)) + return 0; + + if (!json_object_object_get_ex(jobj2, "integrity", &jobj3)) + return 0; + + if (!json_object_object_get_ex(jobj3, "journal_encryption", &jobj4) || + !(str = json_object_get_string(jobj4)) || + strcmp(str, "none")) + return 0; + + if (!json_object_object_get_ex(jobj3, "journal_integrity", &jobj4) || + !(str = json_object_get_string(jobj4)) || + strcmp(str, "none")) + return 0; + + return 1; +} + +static int LUKS2_keyslot_get_volume_key_size(struct luks2_hdr *hdr, const char *keyslot) +{ + json_object *jobj1, *jobj2, *jobj3; + + if (!json_object_object_get_ex(hdr->jobj, "keyslots", &jobj1)) + return -1; + + if (!json_object_object_get_ex(jobj1, keyslot, &jobj2)) + return -1; + + if (!json_object_object_get_ex(jobj2, "key_size", &jobj3)) + return -1; + + return json_object_get_int(jobj3); +} + +/* Key size used for encryption of keyslot */ +int LUKS2_get_keyslot_stored_key_size(struct luks2_hdr *hdr, int keyslot) +{ + char keyslot_name[16]; + + if (snprintf(keyslot_name, sizeof(keyslot_name), "%u", keyslot) < 1) + return -1; + + return LUKS2_keyslot_get_volume_key_size(hdr, keyslot_name); +} + +int LUKS2_get_volume_key_size(struct luks2_hdr *hdr, int segment) +{ + json_object *jobj_digests, *jobj_digest_segments, *jobj_digest_keyslots, *jobj1; + char buf[16]; + + if (snprintf(buf, sizeof(buf), "%u", segment) < 1) + return -1; + + json_object_object_get_ex(hdr->jobj, "digests", &jobj_digests); + + json_object_object_foreach(jobj_digests, key, val) { + UNUSED(key); + json_object_object_get_ex(val, "segments", &jobj_digest_segments); + json_object_object_get_ex(val, "keyslots", &jobj_digest_keyslots); + + if (!LUKS2_array_jobj(jobj_digest_segments, buf)) + continue; + if (json_object_array_length(jobj_digest_keyslots) <= 0) + continue; + + jobj1 = json_object_array_get_idx(jobj_digest_keyslots, 0); + + return LUKS2_keyslot_get_volume_key_size(hdr, json_object_get_string(jobj1)); + } + + return -1; +} + +int LUKS2_get_sector_size(struct luks2_hdr *hdr) +{ + json_object *jobj1, *jobj_segment; + + jobj_segment = LUKS2_get_segment_jobj(hdr, CRYPT_DEFAULT_SEGMENT); + if (!jobj_segment) + return SECTOR_SIZE; + + json_object_object_get_ex(jobj_segment, "sector_size", &jobj1); + if (!jobj1) + return SECTOR_SIZE; + + return json_object_get_int(jobj1); +} + +int LUKS2_activate(struct crypt_device *cd, + const char *name, + struct volume_key *vk, + uint32_t flags) +{ + int r; + struct luks2_hdr *hdr = crypt_get_hdr(cd, CRYPT_LUKS2); + struct crypt_dm_active_device dmdi = {}, dmd = { + .uuid = crypt_get_uuid(cd), + }; + + /* do not allow activation when particular requirements detected */ + if ((r = LUKS2_unmet_requirements(cd, hdr, 0, 0))) + return r; + + r = dm_crypt_target_set(&dmd.segment, 0, dmd.size, crypt_data_device(cd), + vk, crypt_get_cipher_spec(cd), crypt_get_iv_offset(cd), + crypt_get_data_offset(cd), crypt_get_integrity(cd) ?: "none", + crypt_get_integrity_tag_size(cd), crypt_get_sector_size(cd)); + if (r < 0) + return r; + + /* Add persistent activation flags */ + if (!(flags & CRYPT_ACTIVATE_IGNORE_PERSISTENT)) + LUKS2_config_get_flags(cd, hdr, &dmd.flags); + + dmd.flags |= flags; + + if (crypt_get_integrity_tag_size(cd)) { + if (!LUKS2_integrity_compatible(hdr)) { + log_err(cd, "Unsupported device integrity configuration."); + return -EINVAL; + } + + r = INTEGRITY_create_dmd_device(cd, NULL, NULL, NULL, NULL, &dmdi, dmd.flags); + if (r) + return r; + + dmd.segment.u.crypt.offset = 0; + dmd.segment.size = dmdi.segment.size; + + r = create_or_reload_device_with_integrity(cd, name, CRYPT_LUKS2, &dmd, &dmdi); + } else + r = create_or_reload_device(cd, name, CRYPT_LUKS2, &dmd); + + dm_targets_free(cd, &dmd); + dm_targets_free(cd, &dmdi); + + return r; +} + +int LUKS2_unmet_requirements(struct crypt_device *cd, struct luks2_hdr *hdr, uint32_t reqs_mask, int quiet) +{ + uint32_t reqs; + int r = LUKS2_config_get_requirements(cd, hdr, &reqs); + + if (r) { + if (!quiet) + log_err(cd, _("Failed to read LUKS2 requirements.")); + return r; + } + + /* do not mask unknown requirements check */ + if (reqs_unknown(reqs)) { + if (!quiet) + log_err(cd, _("Unmet LUKS2 requirements detected.")); + return -ETXTBSY; + } + + /* mask out permitted requirements */ + reqs &= ~reqs_mask; + + if (reqs_reencrypt(reqs) && !quiet) + log_err(cd, _("Offline reencryption in progress. Aborting.")); + + /* any remaining unmasked requirement fails the check */ + return reqs ? -EINVAL : 0; +} + +/* + * NOTE: this routine is called on json object that failed validation. + * Proceed with caution :) + * + * known glitches so far: + * + * any version < 2.0.3: + * - luks2 keyslot pbkdf params change via crypt_keyslot_change_by_passphrase() + * could leave previous type parameters behind. Correct this by purging + * all params not needed by current type. + */ +void LUKS2_hdr_repair(struct crypt_device *cd, json_object *hdr_jobj) +{ + json_object *jobj_keyslots; + + if (!json_object_object_get_ex(hdr_jobj, "keyslots", &jobj_keyslots)) + return; + if (!json_object_is_type(jobj_keyslots, json_type_object)) + return; + + LUKS2_keyslots_repair(cd, jobj_keyslots); +} + +void json_object_object_del_by_uint(json_object *jobj, unsigned key) +{ + char key_name[16]; + + if (snprintf(key_name, sizeof(key_name), "%u", key) < 1) + return; + json_object_object_del(jobj, key_name); +} + +int json_object_object_add_by_uint(json_object *jobj, unsigned key, json_object *jobj_val) +{ + char key_name[16]; + + if (snprintf(key_name, sizeof(key_name), "%u", key) < 1) + return -EINVAL; + +#if HAVE_DECL_JSON_OBJECT_OBJECT_ADD_EX + return json_object_object_add_ex(jobj, key_name, jobj_val, 0) ? -ENOMEM : 0; +#else + json_object_object_add(jobj, key_name, jobj_val); + return 0; +#endif +} |