mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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e5bd99665e
It makes key verification easier and also allows digest verification for keys not assigned to device segment (unbound keys) for more keyslot context types (tokens).
148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/*
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* cryptsetup volume key implementation
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*
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* Copyright (C) 2004-2006 Clemens Fruhwirth <clemens@endorphin.org>
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* Copyright (C) 2010-2023 Red Hat, Inc. All rights reserved.
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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 <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "internal.h"
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struct volume_key *crypt_alloc_volume_key(size_t keylength, const char *key)
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{
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struct volume_key *vk;
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if (keylength > (SIZE_MAX - sizeof(*vk)))
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return NULL;
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vk = malloc(sizeof(*vk) + keylength);
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if (!vk)
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return NULL;
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vk->key_description = NULL;
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vk->keylength = keylength;
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vk->id = KEY_NOT_VERIFIED;
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vk->next = NULL;
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/* keylength 0 is valid => no key */
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if (vk->keylength) {
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if (key)
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memcpy(&vk->key, key, keylength);
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else
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crypt_safe_memzero(&vk->key, keylength);
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}
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return vk;
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}
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int crypt_volume_key_set_description(struct volume_key *vk, const char *key_description)
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{
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if (!vk)
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return -EINVAL;
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free(CONST_CAST(void*)vk->key_description);
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vk->key_description = NULL;
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if (key_description && !(vk->key_description = strdup(key_description)))
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return -ENOMEM;
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return 0;
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}
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void crypt_volume_key_set_id(struct volume_key *vk, int id)
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{
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if (vk && id >= 0)
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vk->id = id;
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}
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int crypt_volume_key_get_id(const struct volume_key *vk)
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{
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return vk ? vk->id : -1;
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}
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struct volume_key *crypt_volume_key_by_id(struct volume_key *vks, int id)
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{
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struct volume_key *vk = vks;
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if (id < 0)
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return NULL;
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while (vk && vk->id != id)
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vk = vk->next;
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return vk;
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}
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void crypt_volume_key_add_next(struct volume_key **vks, struct volume_key *vk)
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{
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struct volume_key *tmp;
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if (!vks)
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return;
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if (!*vks) {
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*vks = vk;
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return;
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}
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tmp = *vks;
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while (tmp->next)
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tmp = tmp->next;
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tmp->next = vk;
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}
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struct volume_key *crypt_volume_key_next(struct volume_key *vk)
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{
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return vk ? vk->next : NULL;
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}
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void crypt_free_volume_key(struct volume_key *vk)
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{
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struct volume_key *vk_next;
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while (vk) {
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crypt_safe_memzero(vk->key, vk->keylength);
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vk->keylength = 0;
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free(CONST_CAST(void*)vk->key_description);
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vk_next = vk->next;
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free(vk);
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vk = vk_next;
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}
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}
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struct volume_key *crypt_generate_volume_key(struct crypt_device *cd, size_t keylength)
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{
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int r;
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struct volume_key *vk;
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vk = crypt_alloc_volume_key(keylength, NULL);
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if (!vk)
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return NULL;
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r = crypt_random_get(cd, vk->key, keylength, CRYPT_RND_KEY);
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if(r < 0) {
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crypt_free_volume_key(vk);
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return NULL;
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}
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return vk;
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}
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