mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* LUKS - Linux Unified Key Setup v2, kernel keyring token
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*
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* Copyright (C) 2016-2021 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2016-2021 Ondrej Kozina
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include "luks2_internal.h"
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int keyring_open(struct crypt_device *cd,
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int token,
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char **buffer,
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size_t *buffer_len,
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void *usrptr __attribute__((unused)))
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{
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json_object *jobj_token, *jobj_key;
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struct luks2_hdr *hdr;
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int r;
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if (!(hdr = crypt_get_hdr(cd, CRYPT_LUKS2)))
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return -EINVAL;
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jobj_token = LUKS2_get_token_jobj(hdr, token);
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if (!jobj_token)
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return -EINVAL;
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json_object_object_get_ex(jobj_token, "key_description", &jobj_key);
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r = keyring_get_passphrase(json_object_get_string(jobj_key), buffer, buffer_len);
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if (r == -ENOTSUP) {
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log_dbg(cd, "Kernel keyring features disabled.");
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return -ENOENT;
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} else if (r < 0) {
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log_dbg(cd, "keyring_get_passphrase failed (error %d)", r);
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return -EPERM;
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}
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return 0;
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}
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int keyring_validate(struct crypt_device *cd __attribute__((unused)),
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const char *json)
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{
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enum json_tokener_error jerr;
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json_object *jobj_token, *jobj_key;
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int r = 1;
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log_dbg(cd, "Validating keyring token json");
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jobj_token = json_tokener_parse_verbose(json, &jerr);
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if (!jobj_token) {
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log_dbg(cd, "Keyring token JSON parse failed.");
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return r;
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}
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if (json_object_object_length(jobj_token) != 3) {
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log_dbg(cd, "Keyring token is expected to have exactly 3 fields.");
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goto out;
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}
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if (!json_object_object_get_ex(jobj_token, "key_description", &jobj_key)) {
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log_dbg(cd, "missing key_description field.");
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goto out;
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}
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if (!json_object_is_type(jobj_key, json_type_string)) {
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log_dbg(cd, "key_description is not a string.");
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goto out;
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}
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/* TODO: perhaps check that key description is in '%s:%s'
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* format where both strings are not empty */
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r = !strlen(json_object_get_string(jobj_key));
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out:
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json_object_put(jobj_token);
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return r;
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}
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void keyring_dump(struct crypt_device *cd, const char *json)
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{
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enum json_tokener_error jerr;
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json_object *jobj_token, *jobj_key;
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jobj_token = json_tokener_parse_verbose(json, &jerr);
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if (!jobj_token)
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return;
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if (!json_object_object_get_ex(jobj_token, "key_description", &jobj_key)) {
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json_object_put(jobj_token);
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return;
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}
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log_std(cd, "\tKey description: %s\n", json_object_get_string(jobj_key));
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json_object_put(jobj_token);
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}
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int LUKS2_token_keyring_json(char *buffer, size_t buffer_size,
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const struct crypt_token_params_luks2_keyring *keyring_params)
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{
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snprintf(buffer, buffer_size, "{ \"type\": \"%s\", \"keyslots\":[],\"key_description\":\"%s\"}",
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LUKS2_TOKEN_KEYRING, keyring_params->key_description);
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return 0;
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}
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int LUKS2_token_keyring_get(struct crypt_device *cd __attribute__((unused)), struct luks2_hdr *hdr,
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int token, struct crypt_token_params_luks2_keyring *keyring_params)
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{
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json_object *jobj_token, *jobj;
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jobj_token = LUKS2_get_token_jobj(hdr, token);
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json_object_object_get_ex(jobj_token, "type", &jobj);
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assert(!strcmp(json_object_get_string(jobj), LUKS2_TOKEN_KEYRING));
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json_object_object_get_ex(jobj_token, "key_description", &jobj);
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keyring_params->key_description = json_object_get_string(jobj);
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return token;
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}
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