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factor cryptodisk part out

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-23 18:00:42 +02:00
parent fcf3bfb6ff
commit 8585e54bec
7 changed files with 80 additions and 655 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/cryptodisk.c;
common = grub-core/disk/AFSplitter.c;
common = grub-core/lib/pbkdf2.c;
common = grub-core/commands/extcmd.c;

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

@ -768,6 +768,11 @@ module = {
common = disk/loopback.c;
};
module = {
name = cryptodisk;
common = disk/cryptodisk.c;
};
module = {
name = luks;
common = disk/luks.c;

713
grub-core/disk/luks.c
View file

@ -16,6 +16,7 @@
* 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>
@ -25,15 +26,6 @@
#include <grub/crypto.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+");
@ -69,59 +61,6 @@ struct grub_luks_phdr
typedef struct grub_luks_phdr *grub_luks_phdr_t;
typedef enum
{
GRUB_LUKS_MODE_ECB,
GRUB_LUKS_MODE_CBC,
GRUB_LUKS_MODE_PCBC,
GRUB_LUKS_MODE_XTS,
GRUB_LUKS_MODE_LRW
} luks_mode_t;
typedef enum
{
GRUB_LUKS_MODE_IV_NULL,
GRUB_LUKS_MODE_IV_PLAIN,
GRUB_LUKS_MODE_IV_PLAIN64,
GRUB_LUKS_MODE_IV_ESSIV,
GRUB_LUKS_MODE_IV_BENBI,
} luks_mode_iv_t;
/* Our irreducible polynom is x^128+x^7+x^2+x+1. Lowest byte of it is: */
#define GF_POLYNOM 0x87
#define GF_SIZE 128
#define GF_BYTES (GF_SIZE / 8)
#define GF_PER_SECTOR (GRUB_DISK_SECTOR_SIZE / GF_BYTES)
struct grub_luks
{
char *source;
grub_uint32_t offset;
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;
luks_mode_t mode;
luks_mode_iv_t mode_iv;
int benbi_log;
unsigned long id, source_id;
enum grub_disk_dev_id source_dev_id;
char uuid[sizeof (((struct grub_luks_phdr *) 0)->uuid) + 1];
grub_uint8_t lrw_key[GF_BYTES];
grub_uint8_t *lrw_precalc;
#ifdef GRUB_UTIL
char *cheat;
int cheat_fd;
#endif
struct grub_luks *next;
};
typedef struct grub_luks *grub_luks_t;
static grub_luks_t luks_list = NULL;
static grub_uint8_t n = 0;
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);
@ -133,249 +72,13 @@ static const struct grub_arg_option options[] =
{0, 0, 0, 0, 0, 0}
};
static void
gf_mul_x (grub_uint8_t *g)
{
int over = 0, over2 = 0;
int j;
for (j = 0; j < 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 = GF_BYTES - 1; j >= 0; j--)
{
over2 = !!(g[j] & 0x80);
g[j] <<= 1;
g[j] |= over;
over = over2;
}
if (over)
g[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[GF_BYTES];
grub_memset (o, 0, GF_BYTES);
grub_memcpy (t, b, GF_BYTES);
for (i = 0; i < GF_SIZE; i++)
{
if (((a[GF_BYTES - i / 8 - 1] >> (i % 8))) & 1)
grub_crypto_xor (o, o, t, 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[GF_BYTES];
grub_uint8_t high[GF_BYTES];
grub_uint8_t low_byte, low_byte_c;
};
static void
generate_lrw_sector (struct lrw_sector *sec,
const struct grub_luks *dev,
const grub_uint8_t *iv)
{
grub_uint8_t idx[GF_BYTES];
grub_uint16_t c;
int j;
grub_memcpy (idx, iv, GF_BYTES);
sec->low_byte = (idx[GF_BYTES - 1] & (GF_PER_SECTOR - 1));
sec->low_byte_c = (((GF_PER_SECTOR - 1) & ~sec->low_byte) + 1);
idx[GF_BYTES - 1] &= ~(GF_PER_SECTOR - 1);
gf_mul_be (sec->low, dev->lrw_key, idx);
if (!sec->low_byte)
return;
c = idx[GF_BYTES - 1] + GF_PER_SECTOR;
if (c & 0x100)
{
for (j = GF_BYTES - 2; j >= 0; j--)
{
idx[j]++;
if (idx[j] != 0)
break;
}
}
idx[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_luks *dev,
grub_uint8_t *b)
{
int i;
for (i = 0; i < sec->low_byte_c * GF_BYTES; i += GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->low, GF_BYTES);
grub_crypto_xor (b, b, dev->lrw_precalc + GF_BYTES * sec->low_byte,
sec->low_byte_c * GF_BYTES);
if (!sec->low_byte)
return;
for (i = sec->low_byte_c * GF_BYTES;
i < GRUB_DISK_SECTOR_SIZE; i += GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->high, GF_BYTES);
grub_crypto_xor (b + sec->low_byte_c * GF_BYTES,
b + sec->low_byte_c * GF_BYTES,
dev->lrw_precalc, sec->low_byte * GF_BYTES);
}
static gcry_err_code_t
luks_decrypt (const struct grub_luks *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_LUKS_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_LUKS_MODE_IV_NULL:
break;
case GRUB_LUKS_MODE_IV_PLAIN64:
iv[1] = grub_cpu_to_le32 (sector >> 32);
case GRUB_LUKS_MODE_IV_PLAIN:
iv[0] = grub_cpu_to_le32 (sector & 0xFFFFFFFF);
break;
case GRUB_LUKS_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_LUKS_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_LUKS_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_LUKS_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_LUKS_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_LUKS_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;
}
static int check_uuid, have_it;
static char *search_uuid;
static grub_luks_t
static grub_cryptodisk_t
configure_ciphers (const struct grub_luks_phdr *header)
{
grub_luks_t newdev;
grub_cryptodisk_t newdev;
const char *iptr;
char *optr;
char uuid[sizeof (header->uuid) + 1];
@ -387,8 +90,8 @@ configure_ciphers (const struct grub_luks_phdr *header)
grub_crypto_cipher_handle_t essiv_cipher = NULL;
const gcry_md_spec_t *hash = NULL, *essiv_hash = NULL;
const struct gcry_cipher_spec *ciph;
luks_mode_t mode;
luks_mode_iv_t mode_iv;
grub_cryptodisk_mode_t mode;
grub_cryptodisk_mode_iv_t mode_iv;
int benbi_log = 0;
/* Look for LUKS magic sequence. */
@ -442,29 +145,29 @@ configure_ciphers (const struct grub_luks_phdr *header)
/* Configure the cipher mode. */
if (grub_strcmp (ciphermode, "ecb") == 0)
{
mode = GRUB_LUKS_MODE_ECB;
mode_iv = GRUB_LUKS_MODE_IV_PLAIN;
mode = GRUB_CRYPTODISK_MODE_ECB;
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
cipheriv = NULL;
}
else if (grub_strcmp (ciphermode, "plain") == 0)
{
mode = GRUB_LUKS_MODE_CBC;
mode_iv = GRUB_LUKS_MODE_IV_PLAIN;
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_LUKS_MODE_CBC;
mode = GRUB_CRYPTODISK_MODE_CBC;
cipheriv = ciphermode + sizeof ("cbc-") - 1;
}
else if (grub_memcmp (ciphermode, "pcbc-", sizeof ("pcbc-") - 1) == 0)
{
mode = GRUB_LUKS_MODE_PCBC;
mode = GRUB_CRYPTODISK_MODE_PCBC;
cipheriv = ciphermode + sizeof ("pcbc-") - 1;
}
else if (grub_memcmp (ciphermode, "xts-", sizeof ("xts-") - 1) == 0)
{
mode = GRUB_LUKS_MODE_XTS;
mode = GRUB_CRYPTODISK_MODE_XTS;
cipheriv = ciphermode + sizeof ("xts-") - 1;
secondary_cipher = grub_crypto_cipher_open (ciph);
if (!secondary_cipher)
@ -472,14 +175,14 @@ configure_ciphers (const struct grub_luks_phdr *header)
grub_crypto_cipher_close (cipher);
return NULL;
}
if (cipher->cipher->blocksize != GF_BYTES)
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 != GF_BYTES)
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",
@ -489,9 +192,9 @@ configure_ciphers (const struct grub_luks_phdr *header)
}
else if (grub_memcmp (ciphermode, "lrw-", sizeof ("lrw-") - 1) == 0)
{
mode = GRUB_LUKS_MODE_LRW;
mode = GRUB_CRYPTODISK_MODE_LRW;
cipheriv = ciphermode + sizeof ("lrw-") - 1;
if (cipher->cipher->blocksize != GF_BYTES)
if (cipher->cipher->blocksize != GRUB_CRYPTODISK_GF_BYTES)
{
grub_crypto_cipher_close (cipher);
grub_error (GRUB_ERR_BAD_ARGUMENT, "Unsupported LRW block size: %d",
@ -509,9 +212,9 @@ configure_ciphers (const struct grub_luks_phdr *header)
if (cipheriv == NULL);
else if (grub_memcmp (cipheriv, "plain", sizeof ("plain") - 1) == 0)
mode_iv = GRUB_LUKS_MODE_IV_PLAIN;
mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
else if (grub_memcmp (cipheriv, "plain64", sizeof ("plain64") - 1) == 0)
mode_iv = GRUB_LUKS_MODE_IV_PLAIN64;
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)
@ -521,15 +224,15 @@ configure_ciphers (const struct grub_luks_phdr *header)
for (benbi_log = 0;
(cipher->cipher->blocksize << benbi_log) < GRUB_DISK_SECTOR_SIZE;
benbi_log++);
mode_iv = GRUB_LUKS_MODE_IV_BENBI;
mode_iv = GRUB_CRYPTODISK_MODE_IV_BENBI;
}
else if (grub_memcmp (cipheriv, "null", sizeof ("null") - 1) == 0)
mode_iv = GRUB_LUKS_MODE_IV_NULL;
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_LUKS_MODE_IV_ESSIV;
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);
@ -567,7 +270,7 @@ configure_ciphers (const struct grub_luks_phdr *header)
return NULL;
}
newdev = grub_zalloc (sizeof (struct grub_luks));
newdev = grub_zalloc (sizeof (struct grub_cryptodisk));
if (!newdev)
return NULL;
newdev->cipher = cipher;
@ -580,72 +283,12 @@ configure_ciphers (const struct grub_luks_phdr *header)
newdev->essiv_cipher = essiv_cipher;
newdev->essiv_hash = essiv_hash;
newdev->hash = hash;
newdev->id = n++;
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
return newdev;
}
static gcry_err_code_t
luks_setkey (grub_luks_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_LUKS_MODE_XTS)
real_keysize /= 2;
if (dev->mode == GRUB_LUKS_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_LUKS_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_LUKS_MODE_XTS)
{
err = grub_crypto_cipher_set_key (dev->secondary_cipher,
key + real_keysize,
keysize / 2);
if (err)
return err;
}
if (dev->mode == GRUB_LUKS_MODE_LRW)
{
int i;
grub_uint8_t idx[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, GF_BYTES);
for (i = 0; i < GRUB_DISK_SECTOR_SIZE; i += GF_BYTES)
{
idx[GF_BYTES - 1] = i / GF_BYTES;
gf_mul_be (dev->lrw_precalc + i, idx, dev->lrw_key);
}
}
return GPG_ERR_NO_ERROR;
}
static grub_err_t
luks_recover_key (grub_luks_t dev, const struct grub_luks_phdr *header,
luks_recover_key (grub_cryptodisk_t dev, const struct grub_luks_phdr *header,
const char *name, grub_disk_t source)
{
grub_size_t keysize = grub_be_to_cpu32 (header->keyBytes);
@ -700,7 +343,7 @@ luks_recover_key (grub_luks_t dev, const struct grub_luks_phdr *header,
grub_dprintf ("luks", "PBKDF2 done\n");
gcry_err = luks_setkey (dev, digest, keysize);
gcry_err = grub_cryptodisk_setkey (dev, digest, keysize);
if (gcry_err)
{
grub_free (split_key);
@ -721,7 +364,7 @@ luks_recover_key (grub_luks_t dev, const struct grub_luks_phdr *header,
return err;
}
gcry_err = luks_decrypt (dev, split_key, length, 0);
gcry_err = grub_cryptodisk_decrypt (dev, split_key, length, 0);
if (gcry_err)
{
grub_free (split_key);
@ -766,7 +409,7 @@ luks_recover_key (grub_luks_t dev, const struct grub_luks_phdr *header,
grub_printf ("Slot %d opened\n", i);
/* Set the master key. */
gcry_err = luks_setkey (dev, candidate_key, keysize);
gcry_err = grub_cryptodisk_setkey (dev, candidate_key, keysize);
if (gcry_err)
{
grub_free (split_key);
@ -782,7 +425,7 @@ luks_recover_key (grub_luks_t dev, const struct grub_luks_phdr *header,
}
static void
luks_close (grub_luks_t luks)
luks_close (grub_cryptodisk_t luks)
{
grub_crypto_cipher_close (luks->cipher);
grub_crypto_cipher_close (luks->secondary_cipher);
@ -795,11 +438,12 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
{
grub_err_t err;
struct grub_luks_phdr header;
grub_luks_t newdev, dev;
grub_cryptodisk_t newdev, dev;
for (dev = luks_list; dev != NULL; dev = dev->next)
if (dev->source_id == source->id && dev->source_dev_id == source->dev->id)
return GRUB_ERR_NONE;
dev = grub_cryptodisk_get_by_source_disk (source);
if (dev)
return GRUB_ERR_NONE;
/* Read the LUKS header. */
err = grub_disk_read (source, 0, 0, sizeof (header), &header);
@ -817,17 +461,7 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
return err;
}
newdev->source = grub_strdup (name);
if (!newdev->source)
{
grub_free (newdev);
return grub_errno;
}
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
luks_list = newdev;
grub_cryptodisk_insert (newdev, name, source);
have_it = 1;
@ -840,7 +474,7 @@ grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
{
grub_err_t err;
struct grub_luks_phdr header;
grub_luks_t newdev, dev;
grub_cryptodisk_t newdev, dev;
grub_disk_t source;
/* Try to open disk. */
@ -848,12 +482,13 @@ grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
if (!source)
return grub_errno;
for (dev = luks_list; dev != NULL; dev = dev->next)
if (dev->source_id == source->id && dev->source_dev_id == source->dev->id)
{
grub_disk_close (source);
return GRUB_ERR_NONE;
}
dev = grub_cryptodisk_get_by_source_disk (source);
if (dev)
{
grub_disk_close (source);
return GRUB_ERR_NONE;
}
/* Read the LUKS header. */
err = grub_disk_read (source, 0, 0, sizeof (header), &header);
@ -861,25 +496,18 @@ grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
return err;
newdev = configure_ciphers (&header);
grub_disk_close (source);
if (!newdev)
return grub_errno;
newdev->cheat = grub_strdup (cheat);
newdev->source = grub_strdup (sourcedev);
if (!newdev->source || !newdev->cheat)
{
grub_free (newdev->source);
grub_free (newdev->cheat);
grub_free (newdev);
grub_disk_close (source);
return grub_errno;
}
newdev->cheat_fd = -1;
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
luks_list = newdev;
return GRUB_ERR_NONE;
err = grub_cryptodisk_cheat_insert (newdev, sourcedev, source, cheat);
grub_disk_close (source);
if (err)
grub_free (newdev);
return err;
}
#endif
@ -903,208 +531,16 @@ grub_luks_scan_device (const char *name)
return have_it && check_uuid ? 0 : 1;
}
static int
grub_luks_iterate (int (*hook) (const char *name),
grub_disk_pull_t pull)
{
grub_luks_t i;
if (pull != GRUB_DISK_PULL_NONE)
return 0;
for (i = luks_list; i != NULL; i = i->next)
{
char buf[30];
grub_snprintf (buf, sizeof (buf), "luks%lu", i->id);
if (hook (buf))
return 1;
}
return GRUB_ERR_NONE;
}
static grub_err_t
grub_luks_open (const char *name, grub_disk_t disk,
grub_disk_pull_t pull __attribute__ ((unused)))
{
grub_luks_t dev;
if (grub_memcmp (name, "luks", sizeof ("luks") - 1) != 0)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
if (grub_memcmp (name, "luksuuid/", sizeof ("luksuuid/") - 1) == 0)
{
for (dev = luks_list; dev != NULL; dev = dev->next)
if (grub_strcasecmp (name + sizeof ("luksuuid/") - 1, dev->uuid) == 0)
break;
}
else
{
unsigned long id = grub_strtoul (name + sizeof ("luks") - 1, 0, 0);
if (grub_errno)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
/* Search for requested device in the list of LUKS devices. */
for (dev = luks_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 ("luks", "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 = grub_disk_get_size (dev->source_disk) - dev->offset;
disk->id = dev->id;
dev->ref++;
return GRUB_ERR_NONE;
}
static void
grub_luks_close (grub_disk_t disk)
{
grub_luks_t dev = (grub_luks_t) disk->data;
grub_dprintf ("luks", "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_luks_read (grub_disk_t disk, grub_disk_addr_t sector,
grub_size_t size, char *buf)
{
grub_luks_t dev = (grub_luks_t) disk->data;
grub_err_t 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 ("luks",
"Reading %" PRIuGRUB_SIZE " sectors from sector 0x%"
PRIxGRUB_UINT64_T " with offset of %" PRIuGRUB_UINT32_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 ("luks", "grub_disk_read failed with error %d\n", err);
return err;
}
return grub_crypto_gcry_error (luks_decrypt (dev, (grub_uint8_t *) buf,
size << GRUB_DISK_SECTOR_BITS,
sector));
}
static grub_err_t
grub_luks_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_luks_memberlist (grub_disk_t disk)
{
grub_luks_t dev = (grub_luks_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;
}
void
grub_util_luks_print_ciphers (grub_disk_t disk)
{
grub_luks_t dev = (grub_luks_t) disk->data;
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);
}
void
grub_util_luks_print_uuid (grub_disk_t disk)
{
grub_luks_t dev = (grub_luks_t) disk->data;
grub_cryptodisk_t dev = (grub_cryptodisk_t) disk->data;
grub_printf ("%s ", dev->uuid);
}
#endif
static void
luks_cleanup (void)
{
grub_luks_t dev = luks_list;
grub_luks_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;
}
}
static grub_err_t
grub_cmd_luksmount (grub_extcmd_context_t ctxt, int argc, char **args)
{
@ -1116,14 +552,14 @@ grub_cmd_luksmount (grub_extcmd_context_t ctxt, int argc, char **args)
have_it = 0;
if (state[0].set)
{
grub_luks_t dev;
grub_cryptodisk_t dev;
for (dev = luks_list; dev != NULL; dev = dev->next)
if (grub_strcasecmp (dev->uuid, args[0]) == 0)
{
grub_dprintf ("luks", "already mounted as luks%lu\n", dev->id);
return GRUB_ERR_NONE;
}
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];
@ -1146,7 +582,7 @@ grub_cmd_luksmount (grub_extcmd_context_t ctxt, int argc, char **args)
{
grub_err_t err;
grub_disk_t disk;
grub_luks_t dev;
grub_cryptodisk_t dev;
check_uuid = 0;
search_uuid = NULL;
@ -1154,13 +590,13 @@ grub_cmd_luksmount (grub_extcmd_context_t ctxt, int argc, char **args)
if (!disk)
return grub_errno;
for (dev = luks_list; dev != NULL; dev = dev->next)
if (dev->source_id == disk->id && dev->source_dev_id == disk->dev->id)
{
grub_dprintf ("luks", "already mounted as luks%lu\n", dev->id);
grub_disk_close (disk);
return GRUB_ERR_NONE;
}
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_luks_scan_device_real (args[0], disk);
@ -1170,33 +606,18 @@ grub_cmd_luksmount (grub_extcmd_context_t ctxt, int argc, char **args)
}
}
static struct grub_disk_dev grub_luks_dev = {
.name = "luks",
.id = GRUB_DISK_DEVICE_LUKS_ID,
.iterate = grub_luks_iterate,
.open = grub_luks_open,
.close = grub_luks_close,
.read = grub_luks_read,
.write = grub_luks_write,
#ifdef GRUB_UTIL
.memberlist = grub_luks_memberlist,
#endif
.next = 0
};
static grub_extcmd_t cmd;
GRUB_MOD_INIT (luks)
{
COMPILE_TIME_ASSERT (sizeof (((struct grub_luks_phdr *) 0)->uuid)
< GRUB_CRYPTODISK_MAX_UUID_LENGTH);
cmd = grub_register_extcmd ("luksmount", grub_cmd_luksmount, 0,
N_("SOURCE|-u UUID|-a"),
N_("Mount a LUKS device."), options);
grub_disk_dev_register (&grub_luks_dev);
}
GRUB_MOD_FINI (luks)
{
grub_unregister_extcmd (cmd);
grub_disk_dev_unregister (&grub_luks_dev);
luks_cleanup ();
}

2
grub-core/kern/emu/getroot.c
View file

@ -962,7 +962,7 @@ grub_util_get_grub_dev (const char *os_dev)
dash = grub_strchr (uuid + sizeof ("CRYPT-LUKS1-") - 1, '-');
if (dash)
*dash = 0;
grub_dev = grub_xasprintf ("luksuuid/%s",
grub_dev = grub_xasprintf ("cryptouuid/%s",
uuid + sizeof ("CRYPT-LUKS1-") - 1);
grub_free (uuid);
}

2
include/grub/disk.h
View file

@ -42,7 +42,7 @@ enum grub_disk_dev_id
GRUB_DISK_DEVICE_PXE_ID,
GRUB_DISK_DEVICE_SCSI_ID,
GRUB_DISK_DEVICE_FILE_ID,
GRUB_DISK_DEVICE_LUKS_ID
GRUB_DISK_DEVICE_CRYPTODISK_ID
};
struct grub_disk;

1
include/grub/emu/hostdisk.h
View file

@ -36,7 +36,6 @@ grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector);
ssize_t grub_util_fd_read (int fd, char *buf, size_t len);
grub_err_t
grub_luks_cheat_mount (const char *sourcedev, const char *cheat);
void grub_util_luks_print_ciphers (grub_disk_t disk);
void grub_util_luks_print_uuid (grub_disk_t disk);
#endif /* ! GRUB_BIOSDISK_MACHINE_UTIL_HEADER */

11
util/grub-probe.c
View file

@ -35,6 +35,7 @@
#include <grub/raid.h>
#include <grub/i18n.h>
#include <grub/crypto.h>
#include <grub/cryptodisk.h>
#include <stdio.h>
#include <unistd.h>
@ -106,7 +107,8 @@ probe_luks_uuid (grub_disk_t disk)
free (list);
list = tmp;
}
if (disk->dev->id == GRUB_DISK_DEVICE_LUKS_ID)
/* FIXME: support non-LUKS. */
if (disk->dev->id == GRUB_DISK_DEVICE_CRYPTODISK_ID)
grub_util_luks_print_uuid (disk);
}
@ -144,11 +146,8 @@ probe_abstraction (grub_disk_t disk)
if (disk->dev->id == GRUB_DISK_DEVICE_LVM_ID)
printf ("lvm ");
if (disk->dev->id == GRUB_DISK_DEVICE_LUKS_ID)
{
printf ("luks ");
grub_util_luks_print_ciphers (disk);
}
if (disk->dev->id == GRUB_DISK_DEVICE_CRYPTODISK_ID)
grub_util_cryptodisk_print_abstraction (disk);
raid_level = probe_raid_level (disk);
if (raid_level >= 0)