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diff -rupN cryptsetup-2.0.3.old/lib/luks2/luks2_json_metadata.c cryptsetup-2.0.3/lib/luks2/luks2_json_metadata.c
--- cryptsetup-2.0.3.old/lib/luks2/luks2_json_metadata.c 2019-04-03 18:55:44.392182454 +0200
+++ cryptsetup-2.0.3/lib/luks2/luks2_json_metadata.c 2019-04-03 18:56:22.567106063 +0200
@@ -429,6 +429,7 @@ int LUKS2_token_validate(json_object *hd
{
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;
@@ -505,12 +506,57 @@ static int hdr_validate_tokens(json_obje
return 0;
}
-static int hdr_validate_segments(json_object *hdr_jobj)
+static int hdr_validate_crypt_segment(json_object *jobj, const char *key, json_object *jobj_digests,
+ uint64_t offset, uint64_t size)
{
- json_object *jobj, *jobj_digests, *jobj_offset, *jobj_ivoffset,
- *jobj_length, *jobj_sector_size, *jobj_type, *jobj_integrity;
+ json_object *jobj_ivoffset, *jobj_sector_size, *jobj_integrity;
uint32_t sector_size;
- uint64_t ivoffset, offset, length;
+ uint64_t ivoffset;
+
+ if (!(jobj_ivoffset = json_contains(jobj, key, "Segment", "iv_tweak", json_type_string)) ||
+ !json_contains(jobj, key, "Segment", "encryption", json_type_string) ||
+ !(jobj_sector_size = json_contains(jobj, key, "Segment", "sector_size", json_type_int)))
+ return 1;
+
+ /* integrity */
+ if (json_object_object_get_ex(jobj, "integrity", &jobj_integrity)) {
+ if (!json_contains(jobj, key, "Segment", "integrity", json_type_object) ||
+ !json_contains(jobj_integrity, key, "Segment integrity", "type", json_type_string) ||
+ !json_contains(jobj_integrity, key, "Segment integrity", "journal_encryption", json_type_string) ||
+ !json_contains(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("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 || sector_size % SECTOR_SIZE) {
+ log_dbg("Illegal sector size: %" PRIu32, sector_size);
+ return 1;
+ }
+
+ if (!numbered("iv_tweak", json_object_get_string(jobj_ivoffset)) ||
+ !json_str_to_uint64(jobj_ivoffset, &ivoffset))
+ return 1;
+
+ if (size % sector_size) {
+ log_dbg("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(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("Missing segments section.");
@@ -530,70 +576,46 @@ static int hdr_validate_segments(json_ob
if (!numbered("Segment", key))
return 1;
- if (!json_contains(val, key, "Segment", "type", json_type_string) ||
+ /* those fields are mandatory for all segment types */
+ if (!(jobj_type = json_contains(val, key, "Segment", "type", json_type_string)) ||
!(jobj_offset = json_contains(val, key, "Segment", "offset", json_type_string)) ||
- !(jobj_ivoffset = json_contains(val, key, "Segment", "iv_tweak", json_type_string)) ||
- !(jobj_length = json_contains(val, key, "Segment", "size", json_type_string)) ||
- !json_contains(val, key, "Segment", "encryption", json_type_string) ||
- !(jobj_sector_size = json_contains(val, key, "Segment", "sector_size", json_type_int)))
- return 1;
-
- /* integrity */
- if (json_object_object_get_ex(val, "integrity", &jobj_integrity)) {
- if (!json_contains(val, key, "Segment", "integrity", json_type_object) ||
- !json_contains(jobj_integrity, key, "Segment integrity", "type", json_type_string) ||
- !json_contains(jobj_integrity, key, "Segment integrity", "journal_encryption", json_type_string) ||
- !json_contains(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("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 || sector_size % 512) {
- log_dbg("Illegal sector size: %" PRIu32, sector_size);
+ !(jobj_size = json_contains(val, key, "Segment", "size", json_type_string)))
return 1;
- }
if (!numbered("offset", json_object_get_string(jobj_offset)) ||
- !numbered("iv_tweak", json_object_get_string(jobj_ivoffset)))
+ !json_str_to_uint64(jobj_offset, &offset))
return 1;
- /* rule out values > UINT64_MAX */
- if (!json_str_to_uint64(jobj_offset, &offset) ||
- !json_str_to_uint64(jobj_ivoffset, &ivoffset))
- return 1;
+ /* size "dynamic" means whole device starting at 'offset' */
+ if (strcmp(json_object_get_string(jobj_size), "dynamic")) {
+ if (!numbered("size", json_object_get_string(jobj_size)) ||
+ !json_str_to_uint64(jobj_size, &size) || !size)
+ return 1;
+ } else
+ size = 0;
- if (offset % sector_size) {
- log_dbg("Offset field has to be aligned to sector size: %" PRIu32, sector_size);
+ /* all device-mapper devices are aligned to 512 sector size */
+ if (offset % SECTOR_SIZE) {
+ log_dbg("Offset field has to be aligned to sector size: %" PRIu32, SECTOR_SIZE);
return 1;
}
-
- if (ivoffset % sector_size) {
- log_dbg("IV offset field has to be aligned to sector size: %" PRIu32, sector_size);
+ if (size % SECTOR_SIZE) {
+ log_dbg("Size field has to be aligned to sector size: %" PRIu32, SECTOR_SIZE);
return 1;
}
- /* length "dynamic" means whole device starting at 'offset' */
- if (strcmp(json_object_get_string(jobj_length), "dynamic")) {
- if (!numbered("size", json_object_get_string(jobj_length)) ||
- !json_str_to_uint64(jobj_length, &length))
+ /* flags array is optional and must contain strings */
+ if (json_object_object_get_ex(val, "flags", NULL)) {
+ if (!(jobj_flags = json_contains(val, key, "Segment", "flags", json_type_array)))
return 1;
-
- if (length % sector_size) {
- log_dbg("Length field has to be aligned to sector size: %" PRIu32, sector_size);
- 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;
}
- json_object_object_get_ex(val, "type", &jobj_type);
+ /* crypt */
if (!strcmp(json_object_get_string(jobj_type), "crypt") &&
- !segment_has_digest(key, jobj_digests))
+ hdr_validate_crypt_segment(val, key, jobj_digests, offset, size))
return 1;
}
@@ -610,6 +632,7 @@ static int hdr_validate_areas(json_objec
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;
@@ -674,11 +697,11 @@ static int hdr_validate_digests(json_obj
return 1;
}
- /* keyslots should already be validated */
+ /* 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 validated atm, but we need to know digest doesn't reference missing segment */
+ /* 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;
@@ -813,10 +836,10 @@ int LUKS2_hdr_validate(json_object *hdr_
struct {
int (*validate)(json_object *);
} checks[] = {
- { hdr_validate_keyslots },
{ hdr_validate_tokens },
{ hdr_validate_digests },
{ hdr_validate_segments },
+ { hdr_validate_keyslots },
{ hdr_validate_areas },
{ hdr_validate_config },
{ NULL }