mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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6296e8d4f8
Add more context to possibly failing kernel keyring routines in log debug output. Mostly split debug output for errors while trying to search the kernel key by description and errors while trying to read/unlink the key by its id.
142 lines
3.8 KiB
C
142 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) 2016-2023 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2016-2023 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 "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 = crypt_keyring_get_user_key(cd, json_object_get_string(jobj_key), buffer, buffer_len);
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if (r == -ENOTSUP)
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return -ENOENT;
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else if (r < 0)
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return -EPERM;
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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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int r;
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r = 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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if (r < 0 || (size_t)r >= buffer_size)
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return -EINVAL;
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return 0;
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}
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int LUKS2_token_keyring_get(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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void keyring_buffer_free(void *buffer, size_t buffer_len __attribute__((unused)))
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{
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crypt_safe_free(buffer);
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}
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