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Check if provided cipher and mode is usable before writing LUKS header to disk.

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If user provided unusable cipher-mode string, LUKS header was written and
keyslot creation failed later.

Better check early (by creating fake dmcrypt device) if cipher is usable
and fail early (without writing LUKS header to device).

Fixes Issue#176
This commit is contained in:
Milan Broz
2013-11-10 22:05:55 +01:00
parent 09c229fe6c
commit ce23225e46
2 changed files with 28 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
lib/luks1/keymanage.c
View File

@@ -3,6 +3,7 @@
*
* Copyright (C) 2004-2006, Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
* Copyright (C) 2013, Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -594,6 +595,28 @@ int LUKS_write_phdr(struct luks_phdr *hdr,
return r;
}
/* Check that kernel supports requested cipher by decryption of one sector */
static int LUKS_check_cipher(struct luks_phdr *hdr, struct crypt_device *ctx)
{
int r;
struct volume_key *empty_key;
char buf[SECTOR_SIZE];
log_dbg("Checking if cipher %s-%s is usable.", hdr->cipherName, hdr->cipherMode);
empty_key = crypt_alloc_volume_key(hdr->keyBytes, NULL);
if (!empty_key)
return -ENOMEM;
r = LUKS_decrypt_from_storage(buf, sizeof(buf),
hdr->cipherName, hdr->cipherMode,
empty_key, 0, ctx);
crypt_free_volume_key(empty_key);
memset(buf, 0, sizeof(buf));
return r;
}
int LUKS_generate_phdr(struct luks_phdr *header,
const struct volume_key *vk,
const char *cipherName, const char *cipherMode, const char *hashSpec,
@@ -647,6 +670,10 @@ int LUKS_generate_phdr(struct luks_phdr *header,
LUKS_fix_header_compatible(header);
r = LUKS_check_cipher(header, ctx);
if (r < 0)
return r;
log_dbg("Generating LUKS header version %d using hash %s, %s, %s, MK %d bytes",
header->version, header->hashSpec ,header->cipherName, header->cipherMode,
header->keyBytes);

2
tests/api-test.c
View File

@@ -1842,7 +1842,7 @@ static void NonFIPSAlg(void)
struct crypt_device *cd;
struct crypt_params_luks1 params = {0};
char key[128] = "";
size_t key_size = 128;
size_t key_size = 128 / 8;
const char *cipher = "aes";
const char *cipher_mode = "cbc-essiv:sha256";
int ret;