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LUKS and GELI support.

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* Makefile.util.def (libgrubkern.a): Add grub-core/lib/crypto.c,
	grub-core/disk/luks.c, grub-core/disk/geli.c,
	grub-core/disk/cryptodisk.c, grub-core/disk/AFSplitter.c,
	grub-core/lib/pbkdf2.c, grub-core/commands/extcmd.c,
	grub-core/lib/arg.c.
	(libgrubmods.a): Remove gcrypts cflags and cppflags.
	Remove grub-core/commands/extcmd.c, grub-core/lib/arg.c,
	grub-core/lib/crypto.c, grub-core/lib/libgcrypt-grub/cipher/sha512.c,
	grub-core/lib/libgcrypt-grub/cipher/crc.c and grub-core/lib/pbkdf2.c.
	(grub-bin2h): Add libgcry.a.
	(grub-mkimage): Likewise.
	(grub-mkrelpath): Likewise.
	(grub-script-check): Likewise.
	(grub-editenv): Likewise.
	(grub-mkpasswd-pbkdf2): Likewise.
	(grub-pe2elf): Likewise.
	(grub-fstest): Likewise.
	(grub-mkfont): Likewise.
	(grub-mkdevicemap): Likewise.
	(grub-probe): Likewise.
	(grub-ofpath): Likewise.
	(grub-mklayout): Likewise.
	(example_unit_test): Likewise.
	(grub-menulst2cfg): Likewise.
	* autogen.sh (UTIL_DEFS): Add Makefile.utilgcry.def.
	* grub-core/Makefile.core.def (cryptodisk): New module.
	(luks): Likewise.
	(geli): Likewise.
	* grub-core/disk/AFSplitter.c: New file.
	* grub-core/disk/cryptodisk.c: Likewise.
	* grub-core/disk/geli.c: Likewise.
	* grub-core/disk/luks.c: Likewise.
	* grub-core/kern/emu/getroot.c (get_dm_uuid): New function based on
	grub_util_is_lvm.
	(grub_util_get_dm_abstraction): New function.
	(grub_util_follow_gpart_up): Likewise.
	(grub_util_get_geom_abstraction): Likewise.
	(grub_util_get_dev_abstraction): Use new functions.
	(grub_util_pull_device): Pull GELI and LUKS.
	(grub_util_get_grub_dev): Handle LUKS and GELI.
	* grub-core/kern/emu/hostdisk.c (grub_util_get_fd_sectors): New function.
	(grub_util_biosdisk_open): Use grub_util_get_fd_sectors.
	(follow_geom_up): Removed.
	(grub_util_fd_seek): New function.
	(open_device): Use grub_util_fd_seek.
	(nread): Rename to ..
	(grub_util_fd_read): ... this. All users updated.
	* grub-core/lib/crypto.c (grub_crypto_ecb_decrypt): A better prototype.
	(grub_crypto_cbc_decrypt): Likewise.
	(grub_crypto_hmac_write): Likewise.
	(grub_crypto_hmac_buffer): Likewise.
	(grub_password_get): Extend to util.
	* include/grub/crypto.h (gcry_cipher_spec) [GRUB_UTIL]:
	New member modname.
	(gcry_md_spec) [GRUB_UTIL]: Likewise.
	* include/grub/cryptodisk.h: New file.
	* include/grub/disk.h (grub_disk_dev_id): Rename LUKS to CRYPTODISK.
	* include/grub/emu/getroot.h (grub_dev_abstraction_types): Add
	LUKS and GELI.
	(grub_util_follow_gpart_up): New proto.
	* include/grub/emu/hostdisk.h (grub_util_fd_seek): Likewise.
	(grub_util_fd_read): Likewise.
	(grub_cryptodisk_cheat_mount): Likewise.
	(grub_util_cryptodisk_print_uuid): Likewise.
	(grub_util_get_fd_sectors): Likewise.
	* util/grub-fstest.c (mount_crypt): New var.
	(fstest): Mount crypto if requested.
	(options): New option -C.
	(argp_parser): Parse -C.
	(main): Init and fini gcry.
	* util/grub-install.in: Support cryptodisk install.
	* util/grub-mkconfig.in: Export GRUB_ENABLE_CRYPTODISK.
	* util/grub-mkconfig_lib.in (is_path_readable_by_grub): Support
	cryptodisk.
	(prepare_grub_to_access_device): Likewise.
	* util/grub-mkpasswd-pbkdf2.c (main): Use grub_password_get.
	* util/grub-probe.c (probe_partmap): Support cryptodisk UUID probe.
	(probe_cryptodisk_uuid): New function.
	(probe_abstraction): Likewise.
	(probe): Use new functions.
	* util/import_gcry.py: Create Makefile.utilgcry.def.
	Add modname member.

	Also-By: Michael Gorven <michael@gorven.za.net>

	Also-By: Clemens Fruhwirth <clemens@endorphin.org>
This commit is contained in:
Vladimir Serbinenko 2011-07-07 23:52:58 +02:00 • committed by Vladimir 'phcoder' Serbinenko
commit a251b71915
24 changed files with 2971 additions and 346 deletions
Download patch file Download diff file Expand all files Collapse all files

89
grub-core/disk/AFSplitter.c Normal file
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/*
* AFsplitter - Anti forensic information splitter
* Copyright 2004, Clemens Fruhwirth <clemens@endorphin.org>
*
* AFsplitter diffuses information over a large stripe of data,
* therefor supporting secure data destruction.
*
* This program is grub_free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the grub_free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 Library 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 grub_free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <grub/crypto.h>
#include <grub/mm.h>
#include <grub/misc.h>
gcry_err_code_t AF_merge (const gcry_md_spec_t * hash, grub_uint8_t * src,
grub_uint8_t * dst, grub_size_t blocksize,
grub_size_t blocknumbers);
static void
diffuse (const gcry_md_spec_t * hash, grub_uint8_t * src,
grub_uint8_t * dst, grub_size_t size)
{
grub_size_t i;
grub_uint32_t IV; /* host byte order independend hash IV */
grub_size_t fullblocks = size / hash->mdlen;
int padding = size % hash->mdlen;
grub_uint8_t final[hash->mdlen];
grub_uint8_t temp[sizeof (IV) + hash->mdlen];
/* hash block the whole data set with different IVs to produce
* more than just a single data block
*/
for (i = 0; i < fullblocks; i++)
{
IV = grub_cpu_to_be32 (i);
grub_memcpy (temp, &IV, sizeof (IV));
grub_memcpy (temp + sizeof (IV), src + hash->mdlen * i, hash->mdlen);
grub_crypto_hash (hash, dst + hash->mdlen * i, temp,
sizeof (IV) + hash->mdlen);
}
if (padding)
{
IV = grub_cpu_to_be32 (i);
grub_memcpy (temp, &IV, sizeof (IV));
grub_memcpy (temp + sizeof (IV), src + hash->mdlen * i, padding);
grub_crypto_hash (hash, final, temp, sizeof (IV) + padding);
grub_memcpy (dst + hash->mdlen * i, final, padding);
}
}
/**
* Merges the splitted master key stored on disk into the original key
*/
gcry_err_code_t
AF_merge (const gcry_md_spec_t * hash, grub_uint8_t * src, grub_uint8_t * dst,
grub_size_t blocksize, grub_size_t blocknumbers)
{
grub_size_t i;
grub_uint8_t *bufblock;
bufblock = grub_zalloc (blocksize);
if (bufblock == NULL)
return GPG_ERR_OUT_OF_MEMORY;
grub_memset (bufblock, 0, blocksize);
for (i = 0; i < blocknumbers - 1; i++)
{
grub_crypto_xor (bufblock, src + (blocksize * i), bufblock, blocksize);
diffuse (hash, bufblock, bufblock, blocksize);
}
grub_crypto_xor (dst, src + (i * blocksize), bufblock, blocksize);
grub_free (bufblock);
return GPG_ERR_NO_ERROR;
}

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grub-core/disk/cryptodisk.c Normal file
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/*
* 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>
#include <grub/extcmd.h>
#include <grub/i18n.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+");
grub_cryptodisk_dev_t grub_cryptodisk_list;
static const struct grub_arg_option options[] =
{
{"uuid", 'u', 0, N_("Mount by UUID."), 0, 0},
{"all", 'a', 0, N_("Mount all."), 0, 0},
{"boot", 'b', 0, N_("Mount all volumes marked as boot."), 0, 0},
{0, 0, 0, 0, 0, 0}
};
/* Our irreducible polynom is x^128+x^7+x^2+x+1. Lowest byte of it is: */
#define GF_POLYNOM 0x87
static inline int GF_PER_SECTOR (const struct grub_cryptodisk *dev)
{
return 1U << (dev->log_sector_size - GRUB_CRYPTODISK_GF_LOG_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;
unsigned 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 = (int) 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)
{
unsigned 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 (dev) - 1));
sec->low_byte_c = (((GF_PER_SECTOR (dev) - 1) & ~sec->low_byte) + 1);
idx[GRUB_CRYPTODISK_GF_BYTES - 1] &= ~(GF_PER_SECTOR (dev) - 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 (dev);
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)
{
unsigned 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 < (1U << dev->log_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 (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 && !dev->rekey)
return grub_crypto_ecb_decrypt (dev->cipher, data, data, len);
for (i = 0; i < len; i += (1U << dev->log_sector_size))
{
grub_size_t sz = ((dev->cipher->cipher->blocksize
+ sizeof (grub_uint32_t) - 1)
/ sizeof (grub_uint32_t));
grub_uint32_t iv[sz];
if (dev->rekey)
{
grub_uint64_t zone = sector >> dev->rekey_shift;
if (zone != dev->last_rekey)
{
err = dev->rekey (dev, zone);
if (err)
return err;
dev->last_rekey = zone;
}
}
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];
grub_memset (ctx, 0, sizeof (ctx));
tmp = grub_cpu_to_le64 (sector << dev->log_sector_size);
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_BYTECOUNT64:
iv[1] = grub_cpu_to_le32 (sector >> (32 - dev->log_sector_size));
iv[0] = grub_cpu_to_le32 ((sector << dev->log_sector_size)
& 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,
(1U << dev->log_sector_size), iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_PCBC:
err = grub_crypto_pcbc_decrypt (dev->cipher, data + i, data + i,
(1U << dev->log_sector_size), iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_XTS:
{
unsigned j;
err = grub_crypto_ecb_encrypt (dev->secondary_cipher, iv, iv,
dev->cipher->cipher->blocksize);
if (err)
return err;
for (j = 0; j < (1U << dev->log_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,
(1U << dev->log_sector_size));
if (err)
return err;
lrw_xor (&sec, dev, data + i);
}
break;
case GRUB_CRYPTODISK_MODE_ECB:
grub_crypto_ecb_decrypt (dev->cipher, data + i, data + i,
(1U << dev->log_sector_size));
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)
{
unsigned 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 ((1U << dev->log_sector_size));
if (!dev->lrw_precalc)
return GPG_ERR_OUT_OF_MEMORY;
grub_memset (idx, 0, GRUB_CRYPTODISK_GF_BYTES);
for (i = 0; i < (1U << dev->log_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");
disk->log_sector_size = dev->log_sector_size;
#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_seek (dev->cheat_fd, dev->cheat,
sector << disk->log_sector_size);
if (err)
return err;
if (grub_util_fd_read (dev->cheat_fd, buf, size << disk->log_sector_size)
!= (ssize_t) (size << disk->log_sector_size))
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 << (disk->log_sector_size
- GRUB_DISK_SECTOR_BITS)) + dev->offset, 0,
size << disk->log_sector_size, 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 << disk->log_sector_size,
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 ("cryptodisk %s ", dev->modname);
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);
}
void
grub_util_cryptodisk_print_uuid (grub_disk_t disk)
{
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_printf ("%s ", dev->uuid);
}
#endif
static int check_boot, have_it;
static char *search_uuid;
static void
cryptodisk_close (grub_cryptodisk_t dev)
{
grub_crypto_cipher_close (dev->cipher);
grub_crypto_cipher_close (dev->secondary_cipher);
grub_crypto_cipher_close (dev->essiv_cipher);
grub_free (dev);
}
static grub_err_t
grub_cryptodisk_scan_device_real (const char *name, grub_disk_t source)
{
grub_err_t err;
grub_cryptodisk_t dev;
grub_cryptodisk_dev_t cr;
dev = grub_cryptodisk_get_by_source_disk (source);
if (dev)
return GRUB_ERR_NONE;
FOR_CRYPTODISK_DEVS (cr)
{
dev = cr->scan (source, search_uuid, check_boot);
if (grub_errno)
return grub_errno;
if (!dev)
continue;
err = cr->recover_key (source, dev);
if (err)
{
cryptodisk_close (dev);
return err;
}
grub_cryptodisk_insert (dev, name, source);
have_it = 1;
return GRUB_ERR_NONE;
}
return GRUB_ERR_NONE;
}
#ifdef GRUB_UTIL
#include <grub/util/misc.h>
grub_err_t
grub_cryptodisk_cheat_mount (const char *sourcedev, const char *cheat)
{
grub_err_t err;
grub_cryptodisk_t dev;
grub_cryptodisk_dev_t cr;
grub_disk_t source;
/* 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;
}
FOR_CRYPTODISK_DEVS (cr)
{
dev = cr->scan (source, search_uuid, check_boot);
if (grub_errno)
return grub_errno;
if (!dev)
continue;
grub_util_info ("cheatmounted %s (%s) at %s", sourcedev, dev->modname,
cheat);
err = grub_cryptodisk_cheat_insert (dev, sourcedev, source, cheat);
grub_disk_close (source);
if (err)
grub_free (dev);
return GRUB_ERR_NONE;
}
grub_disk_close (source);
return GRUB_ERR_NONE;
}
#endif
static int
grub_cryptodisk_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_cryptodisk_scan_device_real (name, source);
grub_disk_close (source);
if (err)
grub_print_error ();
return have_it && search_uuid ? 1 : 0;
}
static grub_err_t
grub_cmd_cryptomount (grub_extcmd_context_t ctxt, int argc, char **args)
{
struct grub_arg_list *state = ctxt->state;
if (argc < 1 && !state[1].set && !state[2].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 ("cryptodisk",
"already mounted as crypto%lu\n", dev->id);
return GRUB_ERR_NONE;
}
check_boot = state[2].set;
search_uuid = args[0];
grub_device_iterate (&grub_cryptodisk_scan_device);
search_uuid = NULL;
if (!have_it)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such cryptodisk found");
return GRUB_ERR_NONE;
}
else if (state[1].set || (argc == 0 && state[2].set))
{
search_uuid = NULL;
check_boot = state[2].set;
grub_device_iterate (&grub_cryptodisk_scan_device);
search_uuid = NULL;
return GRUB_ERR_NONE;
}
else
{
grub_err_t err;
grub_disk_t disk;
grub_cryptodisk_t dev;
search_uuid = NULL;
check_boot = state[2].set;
disk = grub_disk_open (args[0]);
if (!disk)
return grub_errno;
dev = grub_cryptodisk_get_by_source_disk (disk);
if (dev)
{
grub_dprintf ("cryptodisk", "already mounted as crypto%lu\n", dev->id);
grub_disk_close (disk);
return GRUB_ERR_NONE;
}
err = grub_cryptodisk_scan_device_real (args[0], disk);
grub_disk_close (disk);
return err;
}
}
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
};
static grub_extcmd_t cmd;
GRUB_MOD_INIT (cryptodisk)
{
grub_disk_dev_register (&grub_cryptodisk_dev);
cmd = grub_register_extcmd ("cryptomount", grub_cmd_cryptomount, 0,
N_("SOURCE|-u UUID|-a|-b"),
N_("Mount a crypto device."), options);
}
GRUB_MOD_FINI (cryptodisk)
{
grub_disk_dev_unregister (&grub_cryptodisk_dev);
cryptodisk_cleanup ();
}

536
grub-core/disk/geli.c Normal file
View file

@ -0,0 +1,536 @@
/*
* 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/partition.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 flags;
grub_uint16_t alg;
grub_uint16_t keylen;
grub_uint16_t unused3[5];
grub_uint32_t sector_size;
grub_uint8_t keys_used;
grub_uint32_t niter;
grub_uint8_t salt[64];
struct grub_geli_key keys[2];
} __attribute__ ((packed));
enum
{
GRUB_GELI_FLAGS_ONETIME = 1,
GRUB_GELI_FLAGS_BOOT = 2,
};
/* FIXME: support version 0. */
/* FIXME: support big-endian pre-version-4 volumes. */
/* FIXME: support for keyfiles. */
/* FIXME: support for HMAC. */
const char *algorithms[] = {
[0x01] = "des",
[0x02] = "3des",
[0x03] = "blowfish",
[0x04] = "cast5",
/* FIXME: 0x05 is skipjack, but we don't have it. */
[0x0b] = "aes",
/* FIXME: 0x10 is null. */
[0x15] = "camellia128",
[0x16] = "aes"
};
#define MAX_PASSPHRASE 256
static gcry_err_code_t
geli_rekey (struct grub_cryptodisk *dev, grub_uint64_t zoneno)
{
gcry_err_code_t gcry_err;
const struct {
char magic[4];
grub_uint64_t zone;
} __attribute__ ((packed)) tohash
= { {'e', 'k', 'e', 'y'}, grub_cpu_to_le64 (zoneno) };
grub_uint64_t key[(dev->hash->mdlen + 7) / 8];
grub_dprintf ("geli", "rekeying %" PRIuGRUB_UINT64_T " keysize=%d\n",
zoneno, dev->rekey_derived_size);
gcry_err = grub_crypto_hmac_buffer (dev->hash, dev->rekey_key, 64,
&tohash, sizeof (tohash), key);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
return grub_cryptodisk_setkey (dev, (grub_uint8_t *) key,
dev->rekey_derived_size);
}
static inline int
ascii2hex (char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return 0;
}
static inline gcry_err_code_t
make_uuid (const struct grub_geli_phdr *header,
char *uuid)
{
grub_uint8_t uuidbin[GRUB_MD_SHA256->mdlen];
gcry_err_code_t err;
grub_uint8_t *iptr;
char *optr;
err = grub_crypto_hmac_buffer (GRUB_MD_SHA256,
header->salt, sizeof (header->salt),
"uuid", sizeof ("uuid") - 1, uuidbin);
if (err)
return err;
optr = uuid;
for (iptr = uuidbin; iptr < &uuidbin[ARRAY_SIZE (uuidbin)]; iptr++)
{
grub_snprintf (optr, 3, "%02x", *iptr);
optr += 2;
}
*optr = 0;
return GPG_ERR_NO_ERROR;
}
#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>
#include <grub/emu/misc.h>
char *
grub_util_get_geli_uuid (const char *dev)
{
int fd = open (dev, O_RDONLY);
grub_uint64_t s;
unsigned log_secsize;
grub_uint8_t hdr[512];
struct grub_geli_phdr *header;
char *uuid;
gcry_err_code_t err;
if (fd < 0)
return NULL;
s = grub_util_get_fd_sectors (fd, &log_secsize);
grub_util_fd_seek (fd, dev, (s << log_secsize) - 512);
uuid = xmalloc (GRUB_MD_SHA256->mdlen * 2 + 1);
if (grub_util_fd_read (fd, (void *) &hdr, 512) < 0)
grub_util_error ("couldn't read ELI metadata");
COMPILE_TIME_ASSERT (sizeof (header) <= 512);
header = (void *) &hdr;
/* Look for GELI magic sequence. */
if (grub_memcmp (header->magic, GELI_MAGIC, sizeof (GELI_MAGIC))
|| grub_le_to_cpu32 (header->version) > 5
|| grub_le_to_cpu32 (header->version) < 1)
grub_util_error ("wrong ELI magic or version");
err = make_uuid ((void *) &hdr, uuid);
if (err)
return NULL;
return uuid;
}
#endif
static grub_cryptodisk_t
configure_ciphers (grub_disk_t disk, const char *check_uuid,
int boot_only)
{
grub_cryptodisk_t newdev;
struct grub_geli_phdr header;
grub_crypto_cipher_handle_t cipher = NULL, secondary_cipher = NULL;
const struct gcry_cipher_spec *ciph;
const char *ciphername = NULL;
gcry_err_code_t gcry_err;
char uuid[GRUB_MD_SHA256->mdlen * 2 + 1];
grub_disk_addr_t sector;
grub_err_t err;
sector = grub_disk_get_size (disk);
if (sector == GRUB_DISK_SIZE_UNKNOWN || sector == 0)
return NULL;
/* Read the GELI header. */
err = grub_disk_read (disk, sector - 1, 0, sizeof (header), &header);
if (err)
return NULL;
/* Look for GELI magic sequence. */
if (grub_memcmp (header.magic, GELI_MAGIC, sizeof (GELI_MAGIC))
|| grub_le_to_cpu32 (header.version) > 5
|| grub_le_to_cpu32 (header.version) < 1)
{
grub_dprintf ("geli", "wrong magic %02x\n", header.magic[0]);
return NULL;
}
if ((grub_le_to_cpu32 (header.sector_size)
& (grub_le_to_cpu32 (header.sector_size) - 1))
|| grub_le_to_cpu32 (header.sector_size) == 0)
{
grub_dprintf ("geli", "incorrect sector size %d\n",
grub_le_to_cpu32 (header.sector_size));
return NULL;
}
if (grub_le_to_cpu32 (header.flags) & GRUB_GELI_FLAGS_ONETIME)
{
grub_dprintf ("geli", "skipping one-time volume\n");
return NULL;
}
if (boot_only && !(grub_le_to_cpu32 (header.flags) & GRUB_GELI_FLAGS_BOOT))
{
grub_dprintf ("geli", "not a boot volume\n");
return NULL;
}
gcry_err = make_uuid (&header, uuid);
if (gcry_err)
{
grub_crypto_gcry_error (gcry_err);
return NULL;
}
if (check_uuid && grub_strcasecmp (check_uuid, uuid) != 0)
{
grub_dprintf ("geli", "%s != %s\n", uuid, check_uuid);
return NULL;
}
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.alg) == 0x16)
{
secondary_cipher = grub_crypto_cipher_open (ciph);
if (!secondary_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;
}
newdev = grub_zalloc (sizeof (struct grub_cryptodisk));
if (!newdev)
return NULL;
newdev->cipher = cipher;
newdev->secondary_cipher = secondary_cipher;
newdev->offset = 0;
newdev->source_disk = NULL;
newdev->benbi_log = 0;
if (grub_le_to_cpu16 (header.alg) == 0x16)
{
newdev->mode = GRUB_CRYPTODISK_MODE_XTS;
newdev->mode_iv = GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64;
}
else
{
newdev->mode = GRUB_CRYPTODISK_MODE_CBC;
newdev->mode_iv = GRUB_CRYPTODISK_MODE_IV_BYTECOUNT64_HASH;
}
newdev->essiv_cipher = NULL;
newdev->essiv_hash = NULL;
newdev->hash = GRUB_MD_SHA512;
newdev->iv_hash = GRUB_MD_SHA256;
for (newdev->log_sector_size = 0;
(1U << newdev->log_sector_size) < grub_le_to_cpu32 (header.sector_size);
newdev->log_sector_size++);
if (grub_le_to_cpu32 (header.version) >= 5)
{
newdev->rekey = geli_rekey;
newdev->rekey_shift = 20;
}
#ifdef GRUB_UTIL
newdev->modname = "geli";
#endif
newdev->total_length = grub_disk_get_size (disk) - 1;
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
COMPILE_TIME_ASSERT (sizeof (newdev->uuid) >= 32 * 2 + 1);
return newdev;
}
static grub_err_t
recover_key (grub_disk_t source, grub_cryptodisk_t dev)
{
grub_size_t keysize;
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 zero[dev->cipher->cipher->blocksize];
char passphrase[MAX_PASSPHRASE] = "";
unsigned i;
gcry_err_code_t gcry_err;
struct grub_geli_phdr header;
char *tmp;
grub_disk_addr_t sector;
grub_err_t err;
sector = grub_disk_get_size (source);
if (sector == GRUB_DISK_SIZE_UNKNOWN || sector == 0)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not a geli");
/* Read the GELI header. */
err = grub_disk_read (source, sector - 1, 0, sizeof (header), &header);
if (err)
return err;
keysize = grub_le_to_cpu16 (header.keylen) / 8;
grub_memset (zero, 0, sizeof (zero));
grub_printf ("Attempting to decrypt master key...\n");
/* Get the passphrase from the user. */
tmp = NULL;
if (source->partition)
tmp = grub_partition_get_name (source->partition);
grub_printf ("Enter passphrase for %s%s%s (%s): ", source->name,
source->partition ? "," : "", tmp ? : "",
dev->uuid);
grub_free (tmp);
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. */
if (grub_le_to_cpu32 (header.niter) != 0)
{
grub_uint8_t pbkdf_key[64];
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);
}
else
{
struct grub_crypto_hmac_handle *hnd;
hnd = grub_crypto_hmac_init (dev->hash, NULL, 0);
if (!hnd)
return grub_crypto_gcry_error (GPG_ERR_OUT_OF_MEMORY);
grub_crypto_hmac_write (hnd, header.salt, sizeof (header.salt));
grub_crypto_hmac_write (hnd, passphrase, grub_strlen (passphrase));
gcry_err = grub_crypto_hmac_fini (hnd, 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. */
if (!dev->rekey)
{
grub_size_t real_keysize = keysize;
if (grub_le_to_cpu16 (header.alg) == 0x16)
real_keysize *= 2;
gcry_err = grub_cryptodisk_setkey (dev, candidate_key.cipher_key,
real_keysize);
if (gcry_err)
return grub_crypto_gcry_error (gcry_err);
}
else
{
grub_size_t real_keysize = keysize;
if (grub_le_to_cpu16 (header.alg) == 0x16)
real_keysize *= 2;
/* For a reason I don't know, the IV key is used in rekeying. */
grub_memcpy (dev->rekey_key, candidate_key.iv_key,
sizeof (candidate_key.iv_key));
dev->rekey_derived_size = real_keysize;
dev->last_rekey = -1;
COMPILE_TIME_ASSERT (sizeof (dev->rekey_key)
>= sizeof (candidate_key.iv_key));
}
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;
}
struct grub_cryptodisk_dev geli_crypto = {
.scan = configure_ciphers,
.recover_key = recover_key
};
GRUB_MOD_INIT (geli)
{
grub_cryptodisk_dev_register (&geli_crypto);
}
GRUB_MOD_FINI (geli)
{
grub_cryptodisk_dev_unregister (&geli_crypto);
}

470
grub-core/disk/luks.c Normal file
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@ -0,0 +1,470 @@
/*
* 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/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/partition.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define MAX_PASSPHRASE 256
#define LUKS_KEY_ENABLED 0x00AC71F3
/* On disk LUKS header */
struct grub_luks_phdr
{
grub_uint8_t magic[6];
#define LUKS_MAGIC "LUKS\xBA\xBE"
grub_uint16_t version;
char cipherName[32];
char cipherMode[32];
char hashSpec[32];
grub_uint32_t payloadOffset;
grub_uint32_t keyBytes;
grub_uint8_t mkDigest[20];
grub_uint8_t mkDigestSalt[32];
grub_uint32_t mkDigestIterations;
char uuid[40];
struct
{
grub_uint32_t active;
grub_uint32_t passwordIterations;
grub_uint8_t passwordSalt[32];
grub_uint32_t keyMaterialOffset;
grub_uint32_t stripes;
} keyblock[8];
} __attribute__ ((packed));
typedef struct grub_luks_phdr *grub_luks_phdr_t;
gcry_err_code_t AF_merge (const gcry_md_spec_t * hash, grub_uint8_t * src,
grub_uint8_t * dst, grub_size_t blocksize,
grub_size_t blocknumbers);
static grub_cryptodisk_t
configure_ciphers (grub_disk_t disk, const char *check_uuid,
int check_boot)
{
grub_cryptodisk_t newdev;
const char *iptr;
struct grub_luks_phdr header;
char *optr;
char uuid[sizeof (header.uuid) + 1];
char ciphername[sizeof (header.cipherName) + 1];
char ciphermode[sizeof (header.cipherMode) + 1];
char *cipheriv = NULL;
char hashspec[sizeof (header.hashSpec) + 1];
grub_crypto_cipher_handle_t cipher = NULL, secondary_cipher = NULL;
grub_crypto_cipher_handle_t essiv_cipher = NULL;
const gcry_md_spec_t *hash = NULL, *essiv_hash = NULL;
const struct gcry_cipher_spec *ciph;
grub_cryptodisk_mode_t mode;
grub_cryptodisk_mode_iv_t mode_iv;
int benbi_log = 0;
grub_err_t err;
if (check_boot)
return NULL;
/* Read the LUKS header. */
err = grub_disk_read (disk, 0, 0, sizeof (header), &header);
if (err)
{
if (err == GRUB_ERR_OUT_OF_RANGE)
grub_errno = GRUB_ERR_NONE;
return NULL;
}
/* Look for LUKS magic sequence. */
if (grub_memcmp (header.magic, LUKS_MAGIC, sizeof (header.magic))
|| grub_be_to_cpu16 (header.version) != 1)
return NULL;
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 (check_uuid, uuid) != 0)
{
grub_dprintf ("luks", "%s != %s\n", uuid, check_uuid);
return NULL;
}
/* Make sure that strings are null terminated. */
grub_memcpy (ciphername, header.cipherName, sizeof (header.cipherName));
ciphername[sizeof (header.cipherName)] = 0;
grub_memcpy (ciphermode, header.cipherMode, sizeof (header.cipherMode));
ciphermode[sizeof (header.cipherMode)] = 0;
grub_memcpy (hashspec, header.hashSpec, sizeof (header.hashSpec));
hashspec[sizeof (header.hashSpec)] = 0;
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_be_to_cpu32 (header.keyBytes) > 1024)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid keysize %d",
grub_be_to_cpu32 (header.keyBytes));
return NULL;
}
/* Configure the cipher mode. */
if (grub_strcmp (ciphermode, "ecb") == 0)
{
mode = GRUB_CRYPTODISK_MODE_ECB;
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
cipheriv = NULL;
}
else if (grub_strcmp (ciphermode, "plain") == 0)
{
mode = GRUB_CRYPTODISK_MODE_CBC;
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
cipheriv = NULL;
}
else if (grub_memcmp (ciphermode, "cbc-", sizeof ("cbc-") - 1) == 0)
{
mode = GRUB_CRYPTODISK_MODE_CBC;
cipheriv = ciphermode + sizeof ("cbc-") - 1;
}
else if (grub_memcmp (ciphermode, "pcbc-", sizeof ("pcbc-") - 1) == 0)
{
mode = GRUB_CRYPTODISK_MODE_PCBC;
cipheriv = ciphermode + sizeof ("pcbc-") - 1;
}
else if (grub_memcmp (ciphermode, "xts-", sizeof ("xts-") - 1) == 0)
{
mode = GRUB_CRYPTODISK_MODE_XTS;
cipheriv = ciphermode + sizeof ("xts-") - 1;
secondary_cipher = grub_crypto_cipher_open (ciph);
if (!secondary_cipher)
{
grub_crypto_cipher_close (cipher);
return NULL;
}
if (cipher->cipher->blocksize != GRUB_CRYPTODISK_GF_BYTES)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unsupported XTS block size: %d",
cipher->cipher->blocksize);
return NULL;
}
if (secondary_cipher->cipher->blocksize != GRUB_CRYPTODISK_GF_BYTES)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unsupported XTS block size: %d",
secondary_cipher->cipher->blocksize);
return NULL;
}
}
else if (grub_memcmp (ciphermode, "lrw-", sizeof ("lrw-") - 1) == 0)
{
mode = GRUB_CRYPTODISK_MODE_LRW;
cipheriv = ciphermode + sizeof ("lrw-") - 1;
if (cipher->cipher->blocksize != GRUB_CRYPTODISK_GF_BYTES)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unsupported LRW block size: %d",
cipher->cipher->blocksize);
return NULL;
}
}
else
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unknown cipher mode: %s",
ciphermode);
return NULL;
}
if (cipheriv == NULL);
else if (grub_memcmp (cipheriv, "plain", sizeof ("plain") - 1) == 0)
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
else if (grub_memcmp (cipheriv, "plain64", sizeof ("plain64") - 1) == 0)
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN64;
else if (grub_memcmp (cipheriv, "benbi", sizeof ("benbi") - 1) == 0)
{
if (cipher->cipher->blocksize & (cipher->cipher->blocksize - 1)
|| cipher->cipher->blocksize == 0)
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unsupported benbi blocksize: %d",
cipher->cipher->blocksize);
for (benbi_log = 0;
(cipher->cipher->blocksize << benbi_log) < GRUB_DISK_SECTOR_SIZE;
benbi_log++);
mode_iv = GRUB_CRYPTODISK_MODE_IV_BENBI;
}
else if (grub_memcmp (cipheriv, "null", sizeof ("null") - 1) == 0)
mode_iv = GRUB_CRYPTODISK_MODE_IV_NULL;
else if (grub_memcmp (cipheriv, "essiv:", sizeof ("essiv:") - 1) == 0)
{
char *hash_str = cipheriv + 6;
mode_iv = GRUB_CRYPTODISK_MODE_IV_ESSIV;
/* Configure the hash and cipher used for ESSIV. */
essiv_hash = grub_crypto_lookup_md_by_name (hash_str);
if (!essiv_hash)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_FILE_NOT_FOUND,
"Couldn't load %s hash", hash_str);
return NULL;
}
essiv_cipher = grub_crypto_cipher_open (ciph);
if (!essiv_cipher)
{
grub_crypto_cipher_close (cipher);
return NULL;
}
}
else
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unknown IV mode: %s",
cipheriv);
return NULL;
}
/* Configure the hash used for the AF splitter and HMAC. */
hash = grub_crypto_lookup_md_by_name (hashspec);
if (!hash)
{
grub_crypto_cipher_close (cipher);
grub_crypto_cipher_close (essiv_cipher);
grub_crypto_cipher_close (secondary_cipher);
grub_error (GRUB_ERR_FILE_NOT_FOUND, "Couldn't load %s hash",
hashspec);
return NULL;
}
newdev = grub_zalloc (sizeof (struct grub_cryptodisk));
if (!newdev)
return NULL;
newdev->cipher = cipher;
newdev->offset = grub_be_to_cpu32 (header.payloadOffset);
newdev->source_disk = NULL;
newdev->benbi_log = benbi_log;
newdev->mode = mode;
newdev->mode_iv = mode_iv;
newdev->secondary_cipher = secondary_cipher;
newdev->essiv_cipher = essiv_cipher;
newdev->essiv_hash = essiv_hash;
newdev->hash = hash;
newdev->log_sector_size = 9;
newdev->total_length = grub_disk_get_size (disk) - newdev->offset;
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
#ifdef GRUB_UTIL
newdev->modname = "luks";
#endif
COMPILE_TIME_ASSERT (sizeof (newdev->uuid) >= sizeof (uuid));
return newdev;
}
static grub_err_t
luks_recover_key (grub_disk_t source,
grub_cryptodisk_t dev)
{
struct grub_luks_phdr header;
grub_size_t keysize;
grub_uint8_t *split_key = NULL;
char passphrase[MAX_PASSPHRASE] = "";
grub_uint8_t candidate_digest[sizeof (header.mkDigest)];
unsigned i;
grub_size_t length;
grub_err_t err;
grub_size_t max_stripes = 1;
char *tmp;
err = grub_disk_read (source, 0, 0, sizeof (header), &header);
if (err)
return err;
grub_printf ("Attempting to decrypt master key...\n");
keysize = grub_be_to_cpu32 (header.keyBytes);
for (i = 0; i < ARRAY_SIZE (header.keyblock); i++)
if (grub_be_to_cpu32 (header.keyblock[i].active) == LUKS_KEY_ENABLED
&& grub_be_to_cpu32 (header.keyblock[i].stripes) > max_stripes)
max_stripes = grub_be_to_cpu32 (header.keyblock[i].stripes);
split_key = grub_malloc (keysize * max_stripes);
if (!split_key)
return grub_errno;
/* Get the passphrase from the user. */
tmp = NULL;
if (source->partition)
tmp = grub_partition_get_name (source->partition);
grub_printf ("Enter passphrase for %s%s%s (%s): ", source->name,
source->partition ? "," : "", tmp ? : "",
dev->uuid);
grub_free (tmp);
if (!grub_password_get (passphrase, MAX_PASSPHRASE))
{
grub_free (split_key);
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Passphrase not supplied");
}
/* Try to recover master key from each active keyslot. */
for (i = 0; i < ARRAY_SIZE (header.keyblock); i++)
{
gcry_err_code_t gcry_err;
grub_uint8_t candidate_key[keysize];
grub_uint8_t digest[keysize];
/* Check if keyslot is enabled. */
if (grub_be_to_cpu32 (header.keyblock[i].active) != LUKS_KEY_ENABLED)
continue;
grub_dprintf ("luks", "Trying keyslot %d\n", i);
/* Calculate the PBKDF2 of the user supplied passphrase. */
gcry_err = grub_crypto_pbkdf2 (dev->hash, (grub_uint8_t *) passphrase,
grub_strlen (passphrase),
header.keyblock[i].passwordSalt,
sizeof (header.keyblock[i].passwordSalt),
grub_be_to_cpu32 (header.keyblock[i].
passwordIterations),
digest, keysize);
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
grub_dprintf ("luks", "PBKDF2 done\n");
gcry_err = grub_cryptodisk_setkey (dev, digest, keysize);
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
length = (keysize * grub_be_to_cpu32 (header.keyblock[i].stripes));
/* Read and decrypt the key material from the disk. */
err = grub_disk_read (source,
grub_be_to_cpu32 (header.keyblock
[i].keyMaterialOffset), 0,
length, split_key);
if (err)
{
grub_free (split_key);
return err;
}
gcry_err = grub_cryptodisk_decrypt (dev, split_key, length, 0);
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
/* Merge the decrypted key material to get the candidate master key. */
gcry_err = AF_merge (dev->hash, split_key, candidate_key, keysize,
grub_be_to_cpu32 (header.keyblock[i].stripes));
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
grub_dprintf ("luks", "candidate key recovered\n");
/* Calculate the PBKDF2 of the candidate master key. */
gcry_err = grub_crypto_pbkdf2 (dev->hash, candidate_key,
grub_be_to_cpu32 (header.keyBytes),
header.mkDigestSalt,
sizeof (header.mkDigestSalt),
grub_be_to_cpu32
(header.mkDigestIterations),
candidate_digest,
sizeof (candidate_digest));
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
/* Compare the calculated PBKDF2 to the digest stored
in the header to see if it's correct. */
if (grub_memcmp (candidate_digest, header.mkDigest,
sizeof (header.mkDigest)) != 0)
{
grub_dprintf ("luks", "bad digest\n");
continue;
}
grub_printf ("Slot %d opened\n", i);
/* Set the master key. */
gcry_err = grub_cryptodisk_setkey (dev, candidate_key, keysize);
if (gcry_err)
{
grub_free (split_key);
return grub_crypto_gcry_error (gcry_err);
}
grub_free (split_key);
return GRUB_ERR_NONE;
}
return GRUB_ACCESS_DENIED;
}
struct grub_cryptodisk_dev luks_crypto = {
.scan = configure_ciphers,
.recover_key = luks_recover_key
};
GRUB_MOD_INIT (luks)
{
COMPILE_TIME_ASSERT (sizeof (((struct grub_luks_phdr *) 0)->uuid)
< GRUB_CRYPTODISK_MAX_UUID_LENGTH);
grub_cryptodisk_dev_register (&luks_crypto);
}
GRUB_MOD_FINI (luks)
{
grub_cryptodisk_dev_unregister (&luks_crypto);
}