/*
* loop-AES compatible volume handling
*
- * Copyright (C) 2011, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2011-2020 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2011-2020 Milan Broz
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
-#include "crypto_backend.h"
+#include "libcryptsetup.h"
#include "loopaes.h"
+#include "internal.h"
static const char *get_hash(unsigned int key_size)
{
- char *hash;
+ const char *hash;
switch (key_size) {
case 16: hash = "sha256"; break;
const char *hash_name)
{
struct crypt_hash *hd = NULL;
+ int r;
if (crypt_hash_init(&hd, hash_name))
return -EINVAL;
- crypt_hash_write(hd, src, src_len);
- crypt_hash_final(hd, dst, dst_len);
+
+ r = crypt_hash_write(hd, src, src_len);
+ if (!r)
+ r = crypt_hash_final(hd, dst, dst_len);
+
crypt_hash_destroy(hd);
- return 0;
+ return r;
}
-static int hash_keys(struct volume_key **vk,
+static int hash_keys(struct crypt_device *cd,
+ struct volume_key **vk,
+ const char *hash_override,
const char **input_keys,
unsigned int keys_count,
- unsigned int key_len_output)
+ unsigned int key_len_output,
+ unsigned int key_len_input)
{
const char *hash_name;
char tweak, *key_ptr;
- int r, i, key_len_input;
+ unsigned int i;
+ int r = 0;
- hash_name = get_hash(key_len_output);
+ hash_name = hash_override ?: get_hash(key_len_output);
tweak = get_tweak(keys_count);
- key_len_input = strlen(input_keys[0]);
- if (!keys_count || !key_len_output || !hash_name || !key_len_input)
+ if (!keys_count || !key_len_output || !hash_name || !key_len_input) {
+ log_err(cd, _("Key processing error (using hash %s)."),
+ hash_name ?: "[none]");
return -EINVAL;
+ }
- *vk = crypt_alloc_volume_key(key_len_output * keys_count, NULL);
+ *vk = crypt_alloc_volume_key((size_t)key_len_output * keys_count, NULL);
if (!*vk)
return -ENOMEM;
return r;
}
-static int keyfile_is_gpg(char *buffer, unsigned int buffer_len)
+static int keyfile_is_gpg(char *buffer, size_t buffer_len)
{
int r = 0;
int index = buffer_len < 100 ? buffer_len - 1 : 100;
int LOOPAES_parse_keyfile(struct crypt_device *cd,
struct volume_key **vk,
+ const char *hash,
unsigned int *keys_count,
char *buffer,
- unsigned int buffer_len)
-
+ size_t buffer_len)
{
const char *keys[LOOPAES_KEYS_MAX];
- int i, key_index, key_len, offset;
+ unsigned int key_lengths[LOOPAES_KEYS_MAX];
+ unsigned int i, key_index, key_len, offset;
- log_dbg("Parsing loop-AES keyfile of size %d.", buffer_len);
+ log_dbg(cd, "Parsing loop-AES keyfile of size %zu.", buffer_len);
- if (buffer_len < LOOPAES_KEYFILE_MINSIZE) {
- log_err(cd, _("Incompatible loop-AES keyfile detected.\n"));
+ if (!buffer_len)
return -EINVAL;
- }
if (keyfile_is_gpg(buffer, buffer_len)) {
- log_err(cd, "Detected not yet supported GPG encrypted keyfile.\n");
- log_std(cd, "Please use gpg --decrypt <KEYFILE> | cryptsetup --keyfile=- ...\n");
+ log_err(cd, _("Detected not yet supported GPG encrypted keyfile."));
+ log_std(cd, _("Please use gpg --decrypt <KEYFILE> | cryptsetup --keyfile=- ...\n"));
return -EINVAL;
}
offset = 0;
key_index = 0;
+ key_lengths[0] = 0;
while (offset < buffer_len && key_index < LOOPAES_KEYS_MAX) {
- keys[key_index++] = &buffer[offset];
- while (offset < buffer_len && buffer[offset])
+ keys[key_index] = &buffer[offset];
+ key_lengths[key_index] = 0;;
+ while (offset < buffer_len && buffer[offset]) {
offset++;
+ key_lengths[key_index]++;
+ }
+ if (offset == buffer_len) {
+ log_dbg(cd, "Unterminated key #%d in keyfile.", key_index);
+ log_err(cd, _("Incompatible loop-AES keyfile detected."));
+ return -EINVAL;
+ }
while (offset < buffer_len && !buffer[offset])
offset++;
+ key_index++;
}
/* All keys must be the same length */
- key_len = key_index ? strlen(keys[0]) : 0;
+ key_len = key_lengths[0];
for (i = 0; i < key_index; i++)
- if (key_len != strlen(keys[i])) {
- log_dbg("Unexpected length %d of key #%d (should be %d).",
- strlen(keys[i]), i, key_len);
+ if (!key_lengths[i] || (key_lengths[i] != key_len)) {
+ log_dbg(cd, "Unexpected length %d of key #%d (should be %d).",
+ key_lengths[i], i, key_len);
key_len = 0;
break;
}
- log_dbg("Keyfile: %d keys of length %d.", key_index, key_len);
if (offset != buffer_len || key_len == 0 ||
(key_index != 1 && key_index !=64 && key_index != 65)) {
- log_err(cd, _("Incompatible loop-AES keyfile detected.\n"));
+ log_err(cd, _("Incompatible loop-AES keyfile detected."));
return -EINVAL;
}
+ log_dbg(cd, "Keyfile: %d keys of length %d.", key_index, key_len);
+
*keys_count = key_index;
- return hash_keys(vk, keys, key_index, crypt_get_volume_key_size(cd));
+ return hash_keys(cd, vk, hash, keys, key_index,
+ crypt_get_volume_key_size(cd), key_len);
}
int LOOPAES_activate(struct crypt_device *cd,
struct volume_key *vk,
uint32_t flags)
{
- uint64_t size, offset;
- char *cipher;
- const char *device;
- int read_only, r;
-
- size = 0;
- offset = crypt_get_data_offset(cd);
- device = crypt_get_device_name(cd);
- read_only = flags & CRYPT_ACTIVATE_READONLY;
-
- r = device_check_and_adjust(cd, device, 1, &size, &offset, &read_only);
+ int r;
+ uint32_t req_flags, dmc_flags;
+ char *cipher = NULL;
+ struct crypt_dm_active_device dmd = {
+ .flags = flags,
+ };
+
+ r = device_block_adjust(cd, crypt_data_device(cd), DEV_EXCL,
+ crypt_get_data_offset(cd), &dmd.size, &dmd.flags);
if (r)
return r;
if (keys_count == 1) {
- if (asprintf(&cipher, "%s-%s", base_cipher, "cbc-plain") < 0)
- return -ENOMEM;
+ req_flags = DM_PLAIN64_SUPPORTED;
+ r = asprintf(&cipher, "%s-%s", base_cipher, "cbc-plain64");
} else {
- if (!(dm_flags() & DM_LMK_SUPPORTED)) {
- log_err(cd, _("Kernel doesn't support loop-AES compatible mapping.\n"));
- return -ENOTSUP;
- }
- if (asprintf(&cipher, "%s:%d-%s", base_cipher, 64, "cbc-lmk") < 0)
- return -ENOMEM;
+ req_flags = DM_LMK_SUPPORTED;
+ r = asprintf(&cipher, "%s:%d-%s", base_cipher, 64, "cbc-lmk");
+ }
+ if (r < 0)
+ return -ENOMEM;
+
+ r = dm_crypt_target_set(&dmd.segment, 0, dmd.size, crypt_data_device(cd),
+ vk, cipher, crypt_get_iv_offset(cd),
+ crypt_get_data_offset(cd), crypt_get_integrity(cd),
+ crypt_get_integrity_tag_size(cd), crypt_get_sector_size(cd));
+
+ if (r) {
+ free(cipher);
+ return r;
}
- log_dbg("Trying to activate loop-AES device %s using cipher %s.", name, cipher);
- r = dm_create_device(name, device,
- cipher, CRYPT_LOOPAES,
- crypt_get_uuid(cd),
- size, 0, offset, vk->keylength, vk->key,
- read_only, 0);
+ log_dbg(cd, "Trying to activate loop-AES device %s using cipher %s.",
+ name, cipher);
+
+ r = dm_create_device(cd, name, CRYPT_LOOPAES, &dmd);
+
+ if (r < 0 && !dm_flags(cd, DM_CRYPT, &dmc_flags) &&
+ (dmc_flags & req_flags) != req_flags) {
+ log_err(cd, _("Kernel does not support loop-AES compatible mapping."));
+ r = -ENOTSUP;
+ }
+
+ dm_targets_free(cd, &dmd);
free(cipher);
+
return r;
}
projects / platform / upstream / cryptsetup.git / blobdiff