2 * LUKS - Linux Unified Key Setup v2, kernel keyring token
4 * Copyright (C) 2016-2023 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2016-2023 Ondrej Kozina
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include "luks2_internal.h"
24 int keyring_open(struct crypt_device *cd,
28 void *usrptr __attribute__((unused)))
30 json_object *jobj_token, *jobj_key;
31 struct luks2_hdr *hdr;
34 if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2)))
37 jobj_token = LUKS2_get_token_jobj(hdr, token);
41 json_object_object_get_ex(jobj_token, "key_description", &jobj_key);
43 r = keyring_get_passphrase(json_object_get_string(jobj_key), buffer, buffer_len);
45 log_dbg(cd, "Kernel keyring features disabled.");
48 log_dbg(cd, "keyring_get_passphrase failed (error %d)", r);
55 int keyring_validate(struct crypt_device *cd __attribute__((unused)),
58 enum json_tokener_error jerr;
59 json_object *jobj_token, *jobj_key;
62 log_dbg(cd, "Validating keyring token json");
64 jobj_token = json_tokener_parse_verbose(json, &jerr);
66 log_dbg(cd, "Keyring token JSON parse failed.");
70 if (json_object_object_length(jobj_token) != 3) {
71 log_dbg(cd, "Keyring token is expected to have exactly 3 fields.");
75 if (!json_object_object_get_ex(jobj_token, "key_description", &jobj_key)) {
76 log_dbg(cd, "missing key_description field.");
80 if (!json_object_is_type(jobj_key, json_type_string)) {
81 log_dbg(cd, "key_description is not a string.");
85 /* TODO: perhaps check that key description is in '%s:%s'
86 * format where both strings are not empty */
87 r = !strlen(json_object_get_string(jobj_key));
89 json_object_put(jobj_token);
93 void keyring_dump(struct crypt_device *cd, const char *json)
95 enum json_tokener_error jerr;
96 json_object *jobj_token, *jobj_key;
98 jobj_token = json_tokener_parse_verbose(json, &jerr);
102 if (!json_object_object_get_ex(jobj_token, "key_description", &jobj_key)) {
103 json_object_put(jobj_token);
107 log_std(cd, "\tKey description: %s\n", json_object_get_string(jobj_key));
109 json_object_put(jobj_token);
112 int LUKS2_token_keyring_json(char *buffer, size_t buffer_size,
113 const struct crypt_token_params_luks2_keyring *keyring_params)
117 r = snprintf(buffer, buffer_size, "{ \"type\": \"%s\", \"keyslots\":[],\"key_description\":\"%s\"}",
118 LUKS2_TOKEN_KEYRING, keyring_params->key_description);
119 if (r < 0 || (size_t)r >= buffer_size)
125 int LUKS2_token_keyring_get(struct luks2_hdr *hdr,
126 int token, struct crypt_token_params_luks2_keyring *keyring_params)
128 json_object *jobj_token, *jobj;
130 jobj_token = LUKS2_get_token_jobj(hdr, token);
131 json_object_object_get_ex(jobj_token, "type", &jobj);
132 assert(!strcmp(json_object_get_string(jobj), LUKS2_TOKEN_KEYRING));
134 json_object_object_get_ex(jobj_token, "key_description", &jobj);
136 keyring_params->key_description = json_object_get_string(jobj);
141 void keyring_buffer_free(void *buffer, size_t buffer_len __attribute__((unused)))
143 crypt_safe_free(buffer);