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geli support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-24 00:00:29 +02:00
parent 8585e54bec
commit 1a1f408f20
9 changed files with 1281 additions and 8 deletions
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1
Makefile.util.def
View file

@ -23,6 +23,7 @@ library = {
common = grub-core/kern/partition.c;
common = grub-core/lib/crypto.c;
common = grub-core/disk/luks.c;
common = grub-core/disk/geli.c;
common = grub-core/disk/cryptodisk.c;
common = grub-core/disk/AFSplitter.c;
common = grub-core/lib/pbkdf2.c;

5
grub-core/Makefile.core.def
View file

@ -779,6 +779,11 @@ module = {
common = disk/AFSplitter.c;
};
module = {
name = geli;
common = disk/geli.c;
};
module = {
name = lvm;
common = disk/lvm.c;

643
grub-core/disk/cryptodisk.c Normal file
View file

@ -0,0 +1,643 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2007,2010,2011 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/cryptodisk.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/dl.h>
#ifdef GRUB_UTIL
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <grub/emu/hostdisk.h>
#include <unistd.h>
#include <string.h>
#endif
GRUB_MOD_LICENSE ("GPLv3+");
/* Our irreducible polynom is x^128+x^7+x^2+x+1. Lowest byte of it is: */
#define GF_POLYNOM 0x87
#define GF_PER_SECTOR (GRUB_DISK_SECTOR_SIZE / GRUB_CRYPTODISK_GF_BYTES)
static grub_cryptodisk_t cryptodisk_list = NULL;
static grub_uint8_t n = 0;
static void
gf_mul_x (grub_uint8_t *g)
{
int over = 0, over2 = 0;
int j;
for (j = 0; j < GRUB_CRYPTODISK_GF_BYTES; j++)
{
over2 = !!(g[j] & 0x80);
g[j] <<= 1;
g[j] |= over;
over = over2;
}
if (over)
g[0] ^= GF_POLYNOM;
}
static void
gf_mul_x_be (grub_uint8_t *g)
{
int over = 0, over2 = 0;
int j;
for (j = GRUB_CRYPTODISK_GF_BYTES - 1; j >= 0; j--)
{
over2 = !!(g[j] & 0x80);
g[j] <<= 1;
g[j] |= over;
over = over2;
}
if (over)
g[GRUB_CRYPTODISK_GF_BYTES - 1] ^= GF_POLYNOM;
}
static void
gf_mul_be (grub_uint8_t *o, const grub_uint8_t *a, const grub_uint8_t *b)
{
int i;
grub_uint8_t t[GRUB_CRYPTODISK_GF_BYTES];
grub_memset (o, 0, GRUB_CRYPTODISK_GF_BYTES);
grub_memcpy (t, b, GRUB_CRYPTODISK_GF_BYTES);
for (i = 0; i < GRUB_CRYPTODISK_GF_SIZE; i++)
{
if (((a[GRUB_CRYPTODISK_GF_BYTES - i / 8 - 1] >> (i % 8))) & 1)
grub_crypto_xor (o, o, t, GRUB_CRYPTODISK_GF_BYTES);
gf_mul_x_be (t);
}
}
static gcry_err_code_t
grub_crypto_pcbc_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size,
void *iv)
{
grub_uint8_t *inptr, *outptr, *end;
grub_uint8_t ivt[cipher->cipher->blocksize];
if (!cipher->cipher->decrypt)
return GPG_ERR_NOT_SUPPORTED;
if (size % cipher->cipher->blocksize != 0)
return GPG_ERR_INV_ARG;
end = (grub_uint8_t *) in + size;
for (inptr = in, outptr = out; inptr < end;
inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
{
grub_memcpy (ivt, inptr, cipher->cipher->blocksize);
cipher->cipher->decrypt (cipher->ctx, outptr, inptr);
grub_crypto_xor (outptr, outptr, iv, cipher->cipher->blocksize);
grub_crypto_xor (iv, ivt, outptr, cipher->cipher->blocksize);
}
return GPG_ERR_NO_ERROR;
}
struct lrw_sector
{
grub_uint8_t low[GRUB_CRYPTODISK_GF_BYTES];
grub_uint8_t high[GRUB_CRYPTODISK_GF_BYTES];
grub_uint8_t low_byte, low_byte_c;
};
static void
generate_lrw_sector (struct lrw_sector *sec,
const struct grub_cryptodisk *dev,
const grub_uint8_t *iv)
{
grub_uint8_t idx[GRUB_CRYPTODISK_GF_BYTES];
grub_uint16_t c;
int j;
grub_memcpy (idx, iv, GRUB_CRYPTODISK_GF_BYTES);
sec->low_byte = (idx[GRUB_CRYPTODISK_GF_BYTES - 1] & (GF_PER_SECTOR - 1));
sec->low_byte_c = (((GF_PER_SECTOR - 1) & ~sec->low_byte) + 1);
idx[GRUB_CRYPTODISK_GF_BYTES - 1] &= ~(GF_PER_SECTOR - 1);
gf_mul_be (sec->low, dev->lrw_key, idx);
if (!sec->low_byte)
return;
c = idx[GRUB_CRYPTODISK_GF_BYTES - 1] + GF_PER_SECTOR;
if (c & 0x100)
{
for (j = GRUB_CRYPTODISK_GF_BYTES - 2; j >= 0; j--)
{
idx[j]++;
if (idx[j] != 0)
break;
}
}
idx[GRUB_CRYPTODISK_GF_BYTES - 1] = c;
gf_mul_be (sec->high, dev->lrw_key, idx);
}
static void __attribute__ ((unused))
lrw_xor (const struct lrw_sector *sec,
const struct grub_cryptodisk *dev,
grub_uint8_t *b)
{
int i;
for (i = 0; i < sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES; i += GRUB_CRYPTODISK_GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->low, GRUB_CRYPTODISK_GF_BYTES);
grub_crypto_xor (b, b, dev->lrw_precalc + GRUB_CRYPTODISK_GF_BYTES * sec->low_byte,
sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES);
if (!sec->low_byte)
return;
for (i = sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES;
i < GRUB_DISK_SECTOR_SIZE; i += GRUB_CRYPTODISK_GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->high, GRUB_CRYPTODISK_GF_BYTES);
grub_crypto_xor (b + sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES,
b + sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES,
dev->lrw_precalc, sec->low_byte * GRUB_CRYPTODISK_GF_BYTES);
}
gcry_err_code_t
grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
grub_uint8_t * data, grub_size_t len,
grub_disk_addr_t sector)
{
grub_size_t i;
gcry_err_code_t err;
/* The only mode without IV. */
if (dev->mode == GRUB_CRYPTODISK_MODE_ECB)
return grub_crypto_ecb_decrypt (dev->cipher, data, data, len);
for (i = 0; i < len; i += GRUB_DISK_SECTOR_SIZE)
{
grub_size_t sz = ((dev->cipher->cipher->blocksize
+ sizeof (grub_uint32_t) - 1)
/ sizeof (grub_uint32_t));
grub_uint32_t iv[sz];
grub_memset (iv, 0, sz * sizeof (iv[0]));
switch (dev->mode_iv)
{
case GRUB_CRYPTODISK_MODE_IV_NULL:
break;
case GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64_HASH:
{
grub_uint64_t tmp;
grub_uint64_t ctx[(dev->iv_hash->contextsize + 7) / 8];
tmp = grub_cpu_to_le64 (sector << GRUB_DISK_SECTOR_BITS);
dev->iv_hash->init (ctx);
dev->iv_hash->write (ctx, dev->iv_prefix, dev->iv_prefix_len);
dev->iv_hash->write (ctx, &tmp, sizeof (tmp));
dev->iv_hash->final (ctx);
grub_memcpy (iv, dev->iv_hash->read (ctx), sizeof (iv));
}
break;
case GRUB_CRYPTODISK_MODE_IV_PLAIN64:
iv[1] = grub_cpu_to_le32 (sector >> 32);
case GRUB_CRYPTODISK_MODE_IV_PLAIN:
iv[0] = grub_cpu_to_le32 (sector & 0xFFFFFFFF);
break;
case GRUB_CRYPTODISK_MODE_IV_BENBI:
{
grub_uint64_t num = (sector << dev->benbi_log) + 1;
iv[sz - 2] = grub_cpu_to_be32 (num >> 32);
iv[sz - 1] = grub_cpu_to_be32 (num & 0xFFFFFFFF);
}
break;
case GRUB_CRYPTODISK_MODE_IV_ESSIV:
iv[0] = grub_cpu_to_le32 (sector & 0xFFFFFFFF);
err = grub_crypto_ecb_encrypt (dev->essiv_cipher, iv, iv,
dev->cipher->cipher->blocksize);
if (err)
return err;
}
switch (dev->mode)
{
case GRUB_CRYPTODISK_MODE_CBC:
err = grub_crypto_cbc_decrypt (dev->cipher, data + i, data + i,
GRUB_DISK_SECTOR_SIZE, iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_PCBC:
err = grub_crypto_pcbc_decrypt (dev->cipher, data + i, data + i,
GRUB_DISK_SECTOR_SIZE, iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_XTS:
{
int j;
err = grub_crypto_ecb_encrypt (dev->secondary_cipher, iv, iv,
dev->cipher->cipher->blocksize);
if (err)
return err;
for (j = 0; j < GRUB_DISK_SECTOR_SIZE;
j += dev->cipher->cipher->blocksize)
{
grub_crypto_xor (data + i + j, data + i + j, iv,
dev->cipher->cipher->blocksize);
err = grub_crypto_ecb_decrypt (dev->cipher, data + i + j,
data + i + j,
dev->cipher->cipher->blocksize);
if (err)
return err;
grub_crypto_xor (data + i + j, data + i + j, iv,
dev->cipher->cipher->blocksize);
gf_mul_x ((grub_uint8_t *) iv);
}
}
break;
case GRUB_CRYPTODISK_MODE_LRW:
{
struct lrw_sector sec;
generate_lrw_sector (&sec, dev, (grub_uint8_t *) iv);
lrw_xor (&sec, dev, data + i);
err = grub_crypto_ecb_decrypt (dev->cipher, data + i,
data + i, GRUB_DISK_SECTOR_SIZE);
if (err)
return err;
lrw_xor (&sec, dev, data + i);
}
break;
default:
return GPG_ERR_NOT_IMPLEMENTED;
}
sector++;
}
return GPG_ERR_NO_ERROR;
}
gcry_err_code_t
grub_cryptodisk_setkey (grub_cryptodisk_t dev, grub_uint8_t *key, grub_size_t keysize)
{
gcry_err_code_t err;
int real_keysize;
real_keysize = keysize;
if (dev->mode == GRUB_CRYPTODISK_MODE_XTS)
real_keysize /= 2;
if (dev->mode == GRUB_CRYPTODISK_MODE_LRW)
real_keysize -= dev->cipher->cipher->blocksize;
/* Set the PBKDF2 output as the cipher key. */
err = grub_crypto_cipher_set_key (dev->cipher, key, real_keysize);
if (err)
return err;
/* Configure ESSIV if necessary. */
if (dev->mode_iv == GRUB_CRYPTODISK_MODE_IV_ESSIV)
{
grub_size_t essiv_keysize = dev->essiv_hash->mdlen;
grub_uint8_t hashed_key[essiv_keysize];
grub_crypto_hash (dev->essiv_hash, hashed_key, key, keysize);
err = grub_crypto_cipher_set_key (dev->essiv_cipher,
hashed_key, essiv_keysize);
if (err)
return err;
}
if (dev->mode == GRUB_CRYPTODISK_MODE_XTS)
{
err = grub_crypto_cipher_set_key (dev->secondary_cipher,
key + real_keysize,
keysize / 2);
if (err)
return err;
}
if (dev->mode == GRUB_CRYPTODISK_MODE_LRW)
{
int i;
grub_uint8_t idx[GRUB_CRYPTODISK_GF_BYTES];
grub_free (dev->lrw_precalc);
grub_memcpy (dev->lrw_key, key + real_keysize,
dev->cipher->cipher->blocksize);
dev->lrw_precalc = grub_malloc (GRUB_DISK_SECTOR_SIZE);
if (!dev->lrw_precalc)
return GPG_ERR_OUT_OF_MEMORY;
grub_memset (idx, 0, GRUB_CRYPTODISK_GF_BYTES);
for (i = 0; i < GRUB_DISK_SECTOR_SIZE;
i += GRUB_CRYPTODISK_GF_BYTES)
{
idx[GRUB_CRYPTODISK_GF_BYTES - 1] = i / GRUB_CRYPTODISK_GF_BYTES;
gf_mul_be (dev->lrw_precalc + i, idx, dev->lrw_key);
}
}
return GPG_ERR_NO_ERROR;
}
static int
grub_cryptodisk_iterate (int (*hook) (const char *name),
grub_disk_pull_t pull)
{
grub_cryptodisk_t i;
if (pull != GRUB_DISK_PULL_NONE)
return 0;
for (i = cryptodisk_list; i != NULL; i = i->next)
{
char buf[30];
grub_snprintf (buf, sizeof (buf), "crypto%lu", i->id);
if (hook (buf))
return 1;
}
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cryptodisk_open (const char *name, grub_disk_t disk,
grub_disk_pull_t pull __attribute__ ((unused)))
{
grub_cryptodisk_t dev;
if (grub_memcmp (name, "crypto", sizeof ("crypto") - 1) != 0)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
if (grub_memcmp (name, "cryptouuid/", sizeof ("cryptouuid/") - 1) == 0)
{
for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
if (grub_strcasecmp (name + sizeof ("cryptouuid/") - 1, dev->uuid) == 0)
break;
}
else
{
unsigned long id = grub_strtoul (name + sizeof ("crypto") - 1, 0, 0);
if (grub_errno)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
/* Search for requested device in the list of CRYPTODISK devices. */
for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
if (dev->id == id)
break;
}
if (!dev)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
#ifdef GRUB_UTIL
if (dev->cheat)
{
if (dev->cheat_fd == -1)
dev->cheat_fd = open (dev->cheat, O_RDONLY);
if (dev->cheat_fd == -1)
return grub_error (GRUB_ERR_IO, "couldn't open %s: %s",
dev->cheat, strerror (errno));
}
#endif
if (!dev->source_disk)
{
grub_dprintf ("cryptodisk", "Opening device %s\n", name);
/* Try to open the source disk and populate the requested disk. */
dev->source_disk = grub_disk_open (dev->source);
if (!dev->source_disk)
return grub_errno;
}
disk->data = dev;
disk->total_sectors = dev->total_length;
disk->id = dev->id;
dev->ref++;
return GRUB_ERR_NONE;
}
static void
grub_cryptodisk_close (grub_disk_t disk)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_dprintf ("cryptodisk", "Closing disk\n");
dev->ref--;
if (dev->ref != 0)
return;
#ifdef GRUB_UTIL
if (dev->cheat)
{
close (dev->cheat_fd);
dev->cheat_fd = -1;
}
#endif
grub_disk_close (dev->source_disk);
dev->source_disk = NULL;
}
static grub_err_t
grub_cryptodisk_read (grub_disk_t disk, grub_disk_addr_t sector,
grub_size_t size, char *buf)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_err_t err;
gcry_err_code_t gcry_err;
#ifdef GRUB_UTIL
if (dev->cheat)
{
err = grub_util_fd_sector_seek (dev->cheat_fd, dev->cheat, sector);
if (err)
return err;
if (grub_util_fd_read (dev->cheat_fd, buf, size << GRUB_DISK_SECTOR_BITS)
!= (ssize_t) (size << GRUB_DISK_SECTOR_BITS))
return grub_error (GRUB_ERR_READ_ERROR, "cannot read from `%s'",
dev->cheat);
return GRUB_ERR_NONE;
}
#endif
grub_dprintf ("cryptodisk",
"Reading %" PRIuGRUB_SIZE " sectors from sector 0x%"
PRIxGRUB_UINT64_T " with offset of %" PRIuGRUB_UINT64_T "\n",
size, sector, dev->offset);
err = grub_disk_read (dev->source_disk, sector + dev->offset, 0,
size << GRUB_DISK_SECTOR_BITS, buf);
if (err)
{
grub_dprintf ("cryptodisk", "grub_disk_read failed with error %d\n", err);
return err;
}
gcry_err = grub_cryptodisk_decrypt (dev, (grub_uint8_t *) buf,
size << GRUB_DISK_SECTOR_BITS,
sector);
return grub_crypto_gcry_error (gcry_err);
}
static grub_err_t
grub_cryptodisk_write (grub_disk_t disk __attribute ((unused)),
grub_disk_addr_t sector __attribute ((unused)),
grub_size_t size __attribute ((unused)),
const char *buf __attribute ((unused)))
{
return GRUB_ERR_NOT_IMPLEMENTED_YET;
}
#ifdef GRUB_UTIL
static grub_disk_memberlist_t
grub_cryptodisk_memberlist (grub_disk_t disk)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_disk_memberlist_t list = NULL;
list = grub_malloc (sizeof (*list));
if (list)
{
list->disk = dev->source_disk;
list->next = NULL;
}
return list;
}
#endif
static void
cryptodisk_cleanup (void)
{
grub_cryptodisk_t dev = cryptodisk_list;
grub_cryptodisk_t tmp;
while (dev != NULL)
{
grub_free (dev->source);
grub_free (dev->cipher);
grub_free (dev->secondary_cipher);
grub_free (dev->essiv_cipher);
tmp = dev->next;
grub_free (dev);
dev = tmp;
}
}
grub_err_t
grub_cryptodisk_insert (grub_cryptodisk_t newdev, const char *name,
grub_disk_t source)
{
newdev->source = grub_strdup (name);
if (!newdev->source)
{
grub_free (newdev);
return grub_errno;
}
newdev->id = n++;
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = cryptodisk_list;
cryptodisk_list = newdev;
return GRUB_ERR_NONE;
}
grub_cryptodisk_t
grub_cryptodisk_get_by_uuid (const char *uuid)
{
grub_cryptodisk_t dev;
for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
if (grub_strcasecmp (dev->uuid, uuid) == 0)
return dev;
return NULL;
}
grub_cryptodisk_t
grub_cryptodisk_get_by_source_disk (grub_disk_t disk)
{
grub_cryptodisk_t dev;
for (dev = cryptodisk_list; dev != NULL; dev = dev->next)
if (dev->source_id == disk->id && dev->source_dev_id == disk->dev->id)
return dev;
return NULL;
}
#ifdef GRUB_UTIL
grub_err_t
grub_cryptodisk_cheat_insert (grub_cryptodisk_t newdev, const char *name,
grub_disk_t source, const char *cheat)
{
newdev->cheat = grub_strdup (cheat);
newdev->source = grub_strdup (name);
if (!newdev->source || !newdev->cheat)
{
grub_free (newdev->source);
grub_free (newdev->cheat);
return grub_errno;
}
newdev->cheat_fd = -1;
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->id = n++;
newdev->next = cryptodisk_list;
cryptodisk_list = newdev;
return GRUB_ERR_NONE;
}
void
grub_util_cryptodisk_print_abstraction (grub_disk_t disk)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_printf ("luks ");
if (dev->cipher)
grub_printf ("%s ", dev->cipher->cipher->modname);
if (dev->secondary_cipher)
grub_printf ("%s ", dev->secondary_cipher->cipher->modname);
if (dev->essiv_cipher)
grub_printf ("%s ", dev->essiv_cipher->cipher->modname);
if (dev->hash)
grub_printf ("%s ", dev->hash->modname);
if (dev->essiv_hash)
grub_printf ("%s ", dev->essiv_hash->modname);
if (dev->iv_hash)
grub_printf ("%s ", dev->iv_hash->modname);
}
#endif
static struct grub_disk_dev grub_cryptodisk_dev = {
.name = "cryptodisk",
.id = GRUB_DISK_DEVICE_CRYPTODISK_ID,
.iterate = grub_cryptodisk_iterate,
.open = grub_cryptodisk_open,
.close = grub_cryptodisk_close,
.read = grub_cryptodisk_read,
.write = grub_cryptodisk_write,
#ifdef GRUB_UTIL
.memberlist = grub_cryptodisk_memberlist,
#endif
.next = 0
};
GRUB_MOD_INIT (cryptodisk)
{
grub_disk_dev_register (&grub_cryptodisk_dev);
}
GRUB_MOD_FINI (cryptodisk)
{
grub_disk_dev_unregister (&grub_cryptodisk_dev);
cryptodisk_cleanup ();
}

515
grub-core/disk/geli.c Normal file
View file

@ -0,0 +1,515 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2007,2010,2011 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/* This file is loosely based on FreeBSD geli implementation
(but no code was directly copied). FreeBSD geli is distributed under
following terms: */
/*-
* Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <grub/cryptodisk.h>
#include <grub/types.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/err.h>
#include <grub/disk.h>
#include <grub/crypto.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
struct grub_geli_key
{
grub_uint8_t iv_key[64];
grub_uint8_t cipher_key[64];
grub_uint8_t hmac[64];
} __attribute__ ((packed));
struct grub_geli_phdr
{
grub_uint8_t magic[16];
#define GELI_MAGIC "GEOM::ELI"
grub_uint32_t version;
grub_uint32_t unused1;
grub_uint16_t alg;
grub_uint16_t keylen;
grub_uint16_t unused3[7];
grub_uint8_t keys_used;
grub_uint32_t niter;
grub_uint8_t salt[64];
struct grub_geli_key keys[2];
} __attribute__ ((packed));
const char *algorithms[] = {
[0x0b] = "aes",
};
#define MAX_PASSPHRASE 256
static const struct grub_arg_option options[] =
{
{"uuid", 'u', 0, N_("Mount by UUID."), 0, 0},
{"all", 'a', 0, N_("Mount all."), 0, 0},
{0, 0, 0, 0, 0, 0}
};
static int check_uuid, have_it;
static char *search_uuid;
static grub_cryptodisk_t
configure_ciphers (const struct grub_geli_phdr *header)
{
grub_cryptodisk_t newdev;
grub_crypto_cipher_handle_t cipher = NULL;
const struct gcry_cipher_spec *ciph;
const char *ciphername = NULL;
const gcry_md_spec_t *hash = NULL, *iv_hash = NULL;
/* Look for GELI magic sequence. */
if (grub_memcmp (header->magic, GELI_MAGIC, sizeof (GELI_MAGIC))
|| grub_le_to_cpu32 (header->version) != 3)
{
grub_dprintf ("geli", "wrong magic %02x\n", header->magic[0]);
return NULL;
}
#if 0
optr = uuid;
for (iptr = header->uuid; iptr < &header->uuid[ARRAY_SIZE (header->uuid)];
iptr++)
{
if (*iptr != '-')
*optr++ = *iptr;
}
*optr = 0;
if (check_uuid && grub_strcasecmp (search_uuid, uuid) != 0)
{
grub_dprintf ("luks", "%s != %s", uuid, search_uuid);
return NULL;
}
#endif
if (grub_le_to_cpu16 (header->alg) >= ARRAY_SIZE (algorithms)
|| algorithms[grub_le_to_cpu16 (header->alg)] == NULL)
{
grub_error (GRUB_ERR_FILE_NOT_FOUND, "Cipher 0x%x unknown",
grub_le_to_cpu16 (header->alg));
return NULL;
}
ciphername = algorithms[grub_le_to_cpu16 (header->alg)];
ciph = grub_crypto_lookup_cipher_by_name (ciphername);
if (!ciph)
{
grub_error (GRUB_ERR_FILE_NOT_FOUND, "Cipher %s isn't available",
ciphername);
return NULL;
}
/* Configure the cipher used for the bulk data. */
cipher = grub_crypto_cipher_open (ciph);
if (!cipher)
return NULL;
if (grub_le_to_cpu16 (header->keylen) > 1024)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid keysize %d",
grub_le_to_cpu16 (header->keylen));
return NULL;
}
hash = grub_crypto_lookup_md_by_name ("sha512");
if (!hash)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_FILE_NOT_FOUND, "Couldn't load %s hash",
"sha512");
return NULL;
}
iv_hash = grub_crypto_lookup_md_by_name ("sha256");
if (!hash)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_FILE_NOT_FOUND, "Couldn't load %s hash",
"sha512");
return NULL;
}
newdev = grub_zalloc (sizeof (struct grub_cryptodisk));
if (!newdev)
return NULL;
newdev->cipher = cipher;
newdev->offset = 0;
newdev->source_disk = NULL;
newdev->benbi_log = 0;
newdev->mode = GRUB_CRYPTODISK_MODE_CBC;
newdev->mode_iv = GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64_HASH;
newdev->secondary_cipher = NULL;
newdev->essiv_cipher = NULL;
newdev->essiv_hash = NULL;
newdev->hash = hash;
newdev->iv_hash = iv_hash;
#if 0
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
#endif
return newdev;
}
static grub_err_t
recover_key (grub_cryptodisk_t dev, const struct grub_geli_phdr *header,
const char *name, grub_disk_t source __attribute__ ((unused)))
{
grub_size_t keysize = grub_le_to_cpu16 (header->keylen) / 8;
grub_uint8_t digest[dev->hash->mdlen];
grub_uint8_t geomkey[dev->hash->mdlen];
grub_uint8_t verify_key[dev->hash->mdlen];
grub_uint8_t pbkdf_key[64];
grub_uint8_t zero[dev->cipher->cipher->blocksize];
char passphrase[MAX_PASSPHRASE] = "";
unsigned i;
gcry_err_code_t gcry_err;
grub_memset (zero, 0, sizeof (zero));
grub_printf ("Attempting to decrypt master key...\n");
/* Get the passphrase from the user. */
grub_printf ("Enter passphrase for %s (%s): ", name, dev->uuid);
if (!grub_password_get (passphrase, MAX_PASSPHRASE))
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Passphrase not supplied");
/* Calculate the PBKDF2 of the user supplied passphrase. */
gcry_err = grub_crypto_pbkdf2 (dev->hash, (grub_uint8_t *) passphrase,
grub_strlen (passphrase),
header->salt,
sizeof (header->salt),
grub_le_to_cpu32 (header->niter),
pbkdf_key, sizeof (pbkdf_key));
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
gcry_err = grub_crypto_hmac_buffer (dev->hash, NULL, 0, pbkdf_key,
sizeof (pbkdf_key), geomkey);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
gcry_err = grub_crypto_hmac_buffer (dev->hash, geomkey,
sizeof (geomkey), "\1", 1, digest);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
gcry_err = grub_crypto_hmac_buffer (dev->hash, geomkey,
sizeof (geomkey), "\0", 1, verify_key);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
grub_dprintf ("geli", "keylen = %" PRIuGRUB_SIZE "\n", keysize);
/* Try to recover master key from each active keyslot. */
for (i = 0; i < ARRAY_SIZE (header->keys); i++)
{
struct grub_geli_key candidate_key;
grub_uint8_t key_hmac[dev->hash->mdlen];
/* Check if keyslot is enabled. */
if (! (header->keys_used & (1 << i)))
continue;
grub_dprintf ("geli", "Trying keyslot %d\n", i);
gcry_err = grub_crypto_cipher_set_key (dev->cipher,
digest, keysize);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
gcry_err = grub_crypto_cbc_decrypt (dev->cipher, &candidate_key,
&header->keys[i],
sizeof (candidate_key),
zero);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
gcry_err = grub_crypto_hmac_buffer (dev->hash, verify_key,
sizeof (verify_key),
&candidate_key,
(sizeof (candidate_key)
- sizeof (candidate_key.hmac)),
key_hmac);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
if (grub_memcmp (candidate_key.hmac, key_hmac, dev->hash->mdlen) != 0)
continue;
grub_printf ("Slot %d opened\n", i);
/* Set the master key. */
gcry_err = grub_cryptodisk_setkey (dev, candidate_key.cipher_key,
keysize);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
dev->iv_prefix_len = sizeof (candidate_key.iv_key);
grub_memcpy (dev->iv_prefix, candidate_key.iv_key,
sizeof (candidate_key.iv_key));
COMPILE_TIME_ASSERT (sizeof (dev->iv_prefix) >= sizeof (candidate_key.iv_key));
return GRUB_ERR_NONE;
}
return GRUB_ACCESS_DENIED;
}
static void
close (grub_cryptodisk_t luks)
{
grub_crypto_cipher_close (luks->cipher);
grub_crypto_cipher_close (luks->secondary_cipher);
grub_crypto_cipher_close (luks->essiv_cipher);
grub_free (luks);
}
static grub_err_t
grub_geli_scan_device_real (const char *name, grub_disk_t source)
{
grub_err_t err;
struct grub_geli_phdr header;
grub_cryptodisk_t newdev, dev;
grub_disk_addr_t sector;
grub_dprintf ("geli", "scanning %s\n", source->name);
dev = grub_cryptodisk_get_by_source_disk (source);
if (dev)
return GRUB_ERR_NONE;
sector = grub_disk_get_size (source);
if (sector == GRUB_DISK_SIZE_UNKNOWN)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
/* Read the LUKS header. */
err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
if (err)
return err;
newdev = configure_ciphers (&header);
if (!newdev)
return grub_errno;
newdev->total_length = grub_disk_get_size (source) - 1;
err = recover_key (newdev, &header, name, source);
if (err)
{
close (newdev);
return err;
}
grub_cryptodisk_insert (newdev, name, source);
have_it = 1;
return GRUB_ERR_NONE;
}
#ifdef GRUB_UTIL
grub_err_t
grub_geli_cheat_mount (const char *sourcedev, const char *cheat)
{
grub_err_t err;
struct grub_geli_phdr header;
grub_cryptodisk_t newdev, dev;
grub_disk_t source;
grub_disk_addr_t sector;
/* Try to open disk. */
source = grub_disk_open (sourcedev);
if (!source)
return grub_errno;
dev = grub_cryptodisk_get_by_source_disk (source);
if (dev)
{
grub_disk_close (source);
return GRUB_ERR_NONE;
}
sector = grub_disk_get_size (source);
if (sector == GRUB_DISK_SIZE_UNKNOWN)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
/* Read the LUKS header. */
err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
if (err)
return err;
newdev = configure_ciphers (&header);
if (!newdev)
{
grub_disk_close (source);
return grub_errno;
}
newdev->total_length = grub_disk_get_size (source) - 1;
err = grub_cryptodisk_cheat_insert (newdev, sourcedev, source, cheat);
grub_disk_close (source);
if (err)
grub_free (newdev);
return err;
}
#endif
static int
grub_geli_scan_device (const char *name)
{
grub_err_t err;
grub_disk_t source;
/* Try to open disk. */
source = grub_disk_open (name);
if (!source)
return grub_errno;
err = grub_geli_scan_device_real (name, source);
grub_disk_close (source);
if (err)
grub_print_error ();
return have_it && check_uuid ? 0 : 1;
}
#ifdef GRUB_UTIL
void
grub_util_geli_print_uuid (grub_disk_t disk)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_printf ("%s ", dev->uuid);
}
#endif
static grub_err_t
grub_cmd_gelimount (grub_extcmd_context_t ctxt, int argc, char **args)
{
struct grub_arg_list *state = ctxt->state;
if (argc < 1 && !state[1].set)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
have_it = 0;
if (state[0].set)
{
grub_cryptodisk_t dev;
dev = grub_cryptodisk_get_by_uuid (args[0]);
if (dev)
{
grub_dprintf ("luks", "already mounted as crypto%lu\n", dev->id);
return GRUB_ERR_NONE;
}
check_uuid = 1;
search_uuid = args[0];
grub_device_iterate (&grub_geli_scan_device);
search_uuid = NULL;
if (!have_it)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such luks found");
return GRUB_ERR_NONE;
}
else if (state[1].set)
{
check_uuid = 0;
search_uuid = NULL;
grub_device_iterate (&grub_geli_scan_device);
search_uuid = NULL;
return GRUB_ERR_NONE;
}
else
{
grub_err_t err;
grub_disk_t disk;
grub_cryptodisk_t dev;
check_uuid = 0;
search_uuid = NULL;
disk = grub_disk_open (args[0]);
if (!disk)
return grub_errno;
dev = grub_cryptodisk_get_by_source_disk (disk);
if (dev)
{
grub_dprintf ("luks", "already mounted as luks%lu\n", dev->id);
grub_disk_close (disk);
return GRUB_ERR_NONE;
}
err = grub_geli_scan_device_real (args[0], disk);
grub_disk_close (disk);
return err;
}
}
static grub_extcmd_t cmd;
GRUB_MOD_INIT (geli)
{
cmd = grub_register_extcmd ("gelimount", grub_cmd_gelimount, 0,
N_("SOURCE|-u UUID|-a"),
N_("Mount a GELI device."), options);
}
GRUB_MOD_FINI (geli)
{
grub_unregister_extcmd (cmd);
}

4
grub-core/disk/luks.c
View file

@ -454,6 +454,8 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
if (!newdev)
return grub_errno;
newdev->total_length = grub_disk_get_size (source) - newdev->offset;
err = luks_recover_key (newdev, &header, name, source);
if (err)
{
@ -502,6 +504,8 @@ grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
return grub_errno;
}
newdev->total_length = grub_disk_get_size (source) - newdev->offset;
err = grub_cryptodisk_cheat_insert (newdev, sourcedev, source, cheat);
grub_disk_close (source);
if (err)

10
grub-core/lib/crypto.c
View file

@ -193,9 +193,10 @@ grub_crypto_xor (void *out, const void *in1, const void *in2, grub_size_t size)
gcry_err_code_t
grub_crypto_ecb_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size)
void *out, const void *in, grub_size_t size)
{
grub_uint8_t *inptr, *outptr, *end;
const grub_uint8_t *inptr;
grub_uint8_t *outptr, *end;
if (!cipher->cipher->decrypt)
return GPG_ERR_NOT_SUPPORTED;
if (size % cipher->cipher->blocksize != 0)
@ -249,10 +250,11 @@ grub_crypto_cbc_encrypt (grub_crypto_cipher_handle_t cipher,
gcry_err_code_t
grub_crypto_cbc_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size,
void *out, const void *in, grub_size_t size,
void *iv)
{
grub_uint8_t *inptr, *outptr, *end;
const grub_uint8_t *inptr;
grub_uint8_t *outptr, *end;
grub_uint8_t ivt[cipher->cipher->blocksize];
if (!cipher->cipher->decrypt)
return GPG_ERR_NOT_SUPPORTED;

4
include/grub/crypto.h
View file

@ -199,7 +199,7 @@ grub_crypto_xor (void *out, const void *in1, const void *in2, grub_size_t size);
gcry_err_code_t
grub_crypto_ecb_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size);
void *out, const void *in, grub_size_t size);
gcry_err_code_t
grub_crypto_ecb_encrypt (grub_crypto_cipher_handle_t cipher,
@ -210,7 +210,7 @@ grub_crypto_cbc_encrypt (grub_crypto_cipher_handle_t cipher,
void *iv_in);
gcry_err_code_t
grub_crypto_cbc_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size,
void *out, const void *in, grub_size_t size,
void *iv);
void
grub_cipher_register (gcry_cipher_spec_t *cipher);

99
include/grub/cryptodisk.h Normal file
View file

@ -0,0 +1,99 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_CRYPTODISK_HEADER
#define GRUB_CRYPTODISK_HEADER 1
#include <grub/disk.h>
#include <grub/crypto.h>
typedef enum
{
GRUB_CRYPTODISK_MODE_ECB,
GRUB_CRYPTODISK_MODE_CBC,
GRUB_CRYPTODISK_MODE_PCBC,
GRUB_CRYPTODISK_MODE_XTS,
GRUB_CRYPTODISK_MODE_LRW
} grub_cryptodisk_mode_t;
typedef enum
{
GRUB_CRYPTODISK_MODE_IV_NULL,
GRUB_CRYPTODISK_MODE_IV_PLAIN,
GRUB_CRYPTODISK_MODE_IV_PLAIN64,
GRUB_CRYPTODISK_MODE_IV_ESSIV,
GRUB_CRYPTODISK_MODE_IV_BENBI,
GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64_HASH
} grub_cryptodisk_mode_iv_t;
#define GRUB_CRYPTODISK_MAX_UUID_LENGTH 63
#define GRUB_CRYPTODISK_GF_SIZE 128
#define GRUB_CRYPTODISK_GF_BYTES (GRUB_CRYPTODISK_GF_SIZE / 8)
struct grub_cryptodisk
{
char *source;
grub_disk_addr_t offset;
grub_disk_addr_t total_length;
grub_disk_t source_disk;
int ref;
grub_crypto_cipher_handle_t cipher;
grub_crypto_cipher_handle_t secondary_cipher;
grub_crypto_cipher_handle_t essiv_cipher;
const gcry_md_spec_t *essiv_hash, *hash, *iv_hash;
grub_cryptodisk_mode_t mode;
grub_cryptodisk_mode_iv_t mode_iv;
int benbi_log;
unsigned long id, source_id;
enum grub_disk_dev_id source_dev_id;
char uuid[GRUB_CRYPTODISK_MAX_UUID_LENGTH + 1];
grub_uint8_t lrw_key[GRUB_CRYPTODISK_GF_BYTES];
grub_uint8_t *lrw_precalc;
grub_uint8_t iv_prefix[64];
grub_size_t iv_prefix_len;
#ifdef GRUB_UTIL
char *cheat;
int cheat_fd;
#endif
struct grub_cryptodisk *next;
};
typedef struct grub_cryptodisk *grub_cryptodisk_t;
gcry_err_code_t
grub_cryptodisk_setkey (grub_cryptodisk_t dev,
grub_uint8_t *key, grub_size_t keysize);
gcry_err_code_t
grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
grub_uint8_t * data, grub_size_t len,
grub_disk_addr_t sector);
grub_err_t
grub_cryptodisk_insert (grub_cryptodisk_t newdev, const char *name,
grub_disk_t source);
#ifdef GRUB_UTIL
grub_err_t
grub_cryptodisk_cheat_insert (grub_cryptodisk_t newdev, const char *name,
grub_disk_t source, const char *cheat);
void
grub_util_cryptodisk_print_abstraction (grub_disk_t disk);
#endif
grub_cryptodisk_t grub_cryptodisk_get_by_uuid (const char *uuid);
grub_cryptodisk_t grub_cryptodisk_get_by_source_disk (grub_disk_t disk);
#endif

8
util/grub-fstest.c
View file

@ -308,8 +308,12 @@ fstest (int n, char **args)
{
char *argv[2] = { "-a", NULL};
if (mount_crypt)
if (execute_command ("luksmount", 1, argv))
grub_util_error (_("luksmount command fails: %s"), grub_errmsg);
{
if (execute_command ("luksmount", 1, argv))
grub_util_error (_("luksmount command fails: %s"), grub_errmsg);
if (execute_command ("gelimount", 1, argv))
grub_util_error (_("gelimount command fails: %s"), grub_errmsg);
}
}
grub_lvm_fini ();