summaryrefslogtreecommitdiffstats
path: root/qemu/crypto/block-luks.c
diff options
context:
space:
mode:
authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/crypto/block-luks.c
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/crypto/block-luks.c')
-rw-r--r--qemu/crypto/block-luks.c1329
1 files changed, 0 insertions, 1329 deletions
diff --git a/qemu/crypto/block-luks.c b/qemu/crypto/block-luks.c
deleted file mode 100644
index 439f89230..000000000
--- a/qemu/crypto/block-luks.c
+++ /dev/null
@@ -1,1329 +0,0 @@
-/*
- * QEMU Crypto block device encryption LUKS format
- *
- * Copyright (c) 2015-2016 Red Hat, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include "qemu/osdep.h"
-#include "qapi/error.h"
-
-#include "crypto/block-luks.h"
-
-#include "crypto/hash.h"
-#include "crypto/afsplit.h"
-#include "crypto/pbkdf.h"
-#include "crypto/secret.h"
-#include "crypto/random.h"
-
-#ifdef CONFIG_UUID
-#include <uuid/uuid.h>
-#endif
-
-#include "qemu/coroutine.h"
-
-/*
- * Reference for the LUKS format implemented here is
- *
- * docs/on-disk-format.pdf
- *
- * in 'cryptsetup' package source code
- *
- * This file implements the 1.2.1 specification, dated
- * Oct 16, 2011.
- */
-
-typedef struct QCryptoBlockLUKS QCryptoBlockLUKS;
-typedef struct QCryptoBlockLUKSHeader QCryptoBlockLUKSHeader;
-typedef struct QCryptoBlockLUKSKeySlot QCryptoBlockLUKSKeySlot;
-
-
-/* The following constants are all defined by the LUKS spec */
-#define QCRYPTO_BLOCK_LUKS_VERSION 1
-
-#define QCRYPTO_BLOCK_LUKS_MAGIC_LEN 6
-#define QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN 32
-#define QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN 32
-#define QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN 32
-#define QCRYPTO_BLOCK_LUKS_DIGEST_LEN 20
-#define QCRYPTO_BLOCK_LUKS_SALT_LEN 32
-#define QCRYPTO_BLOCK_LUKS_UUID_LEN 40
-#define QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS 8
-#define QCRYPTO_BLOCK_LUKS_STRIPES 4000
-#define QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS 1000
-#define QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS 1000
-#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET 4096
-
-#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED 0x0000DEAD
-#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED 0x00AC71F3
-
-#define QCRYPTO_BLOCK_LUKS_SECTOR_SIZE 512LL
-
-static const char qcrypto_block_luks_magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN] = {
- 'L', 'U', 'K', 'S', 0xBA, 0xBE
-};
-
-typedef struct QCryptoBlockLUKSNameMap QCryptoBlockLUKSNameMap;
-struct QCryptoBlockLUKSNameMap {
- const char *name;
- int id;
-};
-
-typedef struct QCryptoBlockLUKSCipherSizeMap QCryptoBlockLUKSCipherSizeMap;
-struct QCryptoBlockLUKSCipherSizeMap {
- uint32_t key_bytes;
- int id;
-};
-typedef struct QCryptoBlockLUKSCipherNameMap QCryptoBlockLUKSCipherNameMap;
-struct QCryptoBlockLUKSCipherNameMap {
- const char *name;
- const QCryptoBlockLUKSCipherSizeMap *sizes;
-};
-
-
-static const QCryptoBlockLUKSCipherSizeMap
-qcrypto_block_luks_cipher_size_map_aes[] = {
- { 16, QCRYPTO_CIPHER_ALG_AES_128 },
- { 24, QCRYPTO_CIPHER_ALG_AES_192 },
- { 32, QCRYPTO_CIPHER_ALG_AES_256 },
- { 0, 0 },
-};
-
-static const QCryptoBlockLUKSCipherSizeMap
-qcrypto_block_luks_cipher_size_map_cast5[] = {
- { 16, QCRYPTO_CIPHER_ALG_CAST5_128 },
- { 0, 0 },
-};
-
-static const QCryptoBlockLUKSCipherSizeMap
-qcrypto_block_luks_cipher_size_map_serpent[] = {
- { 16, QCRYPTO_CIPHER_ALG_SERPENT_128 },
- { 24, QCRYPTO_CIPHER_ALG_SERPENT_192 },
- { 32, QCRYPTO_CIPHER_ALG_SERPENT_256 },
- { 0, 0 },
-};
-
-static const QCryptoBlockLUKSCipherSizeMap
-qcrypto_block_luks_cipher_size_map_twofish[] = {
- { 16, QCRYPTO_CIPHER_ALG_TWOFISH_128 },
- { 24, QCRYPTO_CIPHER_ALG_TWOFISH_192 },
- { 32, QCRYPTO_CIPHER_ALG_TWOFISH_256 },
- { 0, 0 },
-};
-
-static const QCryptoBlockLUKSCipherNameMap
-qcrypto_block_luks_cipher_name_map[] = {
- { "aes", qcrypto_block_luks_cipher_size_map_aes },
- { "cast5", qcrypto_block_luks_cipher_size_map_cast5 },
- { "serpent", qcrypto_block_luks_cipher_size_map_serpent },
- { "twofish", qcrypto_block_luks_cipher_size_map_twofish },
-};
-
-
-/*
- * This struct is written to disk in big-endian format,
- * but operated upon in native-endian format.
- */
-struct QCryptoBlockLUKSKeySlot {
- /* state of keyslot, enabled/disable */
- uint32_t active;
- /* iterations for PBKDF2 */
- uint32_t iterations;
- /* salt for PBKDF2 */
- uint8_t salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
- /* start sector of key material */
- uint32_t key_offset;
- /* number of anti-forensic stripes */
- uint32_t stripes;
-} QEMU_PACKED;
-
-QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSKeySlot) != 48);
-
-
-/*
- * This struct is written to disk in big-endian format,
- * but operated upon in native-endian format.
- */
-struct QCryptoBlockLUKSHeader {
- /* 'L', 'U', 'K', 'S', '0xBA', '0xBE' */
- char magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN];
-
- /* LUKS version, currently 1 */
- uint16_t version;
-
- /* cipher name specification (aes, etc) */
- char cipher_name[QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN];
-
- /* cipher mode specification (cbc-plain, xts-essiv:sha256, etc) */
- char cipher_mode[QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN];
-
- /* hash specification (sha256, etc) */
- char hash_spec[QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN];
-
- /* start offset of the volume data (in 512 byte sectors) */
- uint32_t payload_offset;
-
- /* Number of key bytes */
- uint32_t key_bytes;
-
- /* master key checksum after PBKDF2 */
- uint8_t master_key_digest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN];
-
- /* salt for master key PBKDF2 */
- uint8_t master_key_salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
-
- /* iterations for master key PBKDF2 */
- uint32_t master_key_iterations;
-
- /* UUID of the partition in standard ASCII representation */
- uint8_t uuid[QCRYPTO_BLOCK_LUKS_UUID_LEN];
-
- /* key slots */
- QCryptoBlockLUKSKeySlot key_slots[QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS];
-} QEMU_PACKED;
-
-QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSHeader) != 592);
-
-
-struct QCryptoBlockLUKS {
- QCryptoBlockLUKSHeader header;
-};
-
-
-static int qcrypto_block_luks_cipher_name_lookup(const char *name,
- QCryptoCipherMode mode,
- uint32_t key_bytes,
- Error **errp)
-{
- const QCryptoBlockLUKSCipherNameMap *map =
- qcrypto_block_luks_cipher_name_map;
- size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map);
- size_t i, j;
-
- if (mode == QCRYPTO_CIPHER_MODE_XTS) {
- key_bytes /= 2;
- }
-
- for (i = 0; i < maplen; i++) {
- if (!g_str_equal(map[i].name, name)) {
- continue;
- }
- for (j = 0; j < map[i].sizes[j].key_bytes; j++) {
- if (map[i].sizes[j].key_bytes == key_bytes) {
- return map[i].sizes[j].id;
- }
- }
- }
-
- error_setg(errp, "Algorithm %s with key size %d bytes not supported",
- name, key_bytes);
- return 0;
-}
-
-static const char *
-qcrypto_block_luks_cipher_alg_lookup(QCryptoCipherAlgorithm alg,
- Error **errp)
-{
- const QCryptoBlockLUKSCipherNameMap *map =
- qcrypto_block_luks_cipher_name_map;
- size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map);
- size_t i, j;
- for (i = 0; i < maplen; i++) {
- for (j = 0; j < map[i].sizes[j].key_bytes; j++) {
- if (map[i].sizes[j].id == alg) {
- return map[i].name;
- }
- }
- }
-
- error_setg(errp, "Algorithm '%s' not supported",
- QCryptoCipherAlgorithm_lookup[alg]);
- return NULL;
-}
-
-/* XXX replace with qapi_enum_parse() in future, when we can
- * make that function emit a more friendly error message */
-static int qcrypto_block_luks_name_lookup(const char *name,
- const char *const *map,
- size_t maplen,
- const char *type,
- Error **errp)
-{
- size_t i;
- for (i = 0; i < maplen; i++) {
- if (g_str_equal(map[i], name)) {
- return i;
- }
- }
-
- error_setg(errp, "%s %s not supported", type, name);
- return 0;
-}
-
-#define qcrypto_block_luks_cipher_mode_lookup(name, errp) \
- qcrypto_block_luks_name_lookup(name, \
- QCryptoCipherMode_lookup, \
- QCRYPTO_CIPHER_MODE__MAX, \
- "Cipher mode", \
- errp)
-
-#define qcrypto_block_luks_hash_name_lookup(name, errp) \
- qcrypto_block_luks_name_lookup(name, \
- QCryptoHashAlgorithm_lookup, \
- QCRYPTO_HASH_ALG__MAX, \
- "Hash algorithm", \
- errp)
-
-#define qcrypto_block_luks_ivgen_name_lookup(name, errp) \
- qcrypto_block_luks_name_lookup(name, \
- QCryptoIVGenAlgorithm_lookup, \
- QCRYPTO_IVGEN_ALG__MAX, \
- "IV generator", \
- errp)
-
-
-static bool
-qcrypto_block_luks_has_format(const uint8_t *buf,
- size_t buf_size)
-{
- const QCryptoBlockLUKSHeader *luks_header = (const void *)buf;
-
- if (buf_size >= offsetof(QCryptoBlockLUKSHeader, cipher_name) &&
- memcmp(luks_header->magic, qcrypto_block_luks_magic,
- QCRYPTO_BLOCK_LUKS_MAGIC_LEN) == 0 &&
- be16_to_cpu(luks_header->version) == QCRYPTO_BLOCK_LUKS_VERSION) {
- return true;
- } else {
- return false;
- }
-}
-
-
-/**
- * Deal with a quirk of dm-crypt usage of ESSIV.
- *
- * When calculating ESSIV IVs, the cipher length used by ESSIV
- * may be different from the cipher length used for the block
- * encryption, becauses dm-crypt uses the hash digest length
- * as the key size. ie, if you have AES 128 as the block cipher
- * and SHA 256 as ESSIV hash, then ESSIV will use AES 256 as
- * the cipher since that gets a key length matching the digest
- * size, not AES 128 with truncated digest as might be imagined
- */
-static QCryptoCipherAlgorithm
-qcrypto_block_luks_essiv_cipher(QCryptoCipherAlgorithm cipher,
- QCryptoHashAlgorithm hash,
- Error **errp)
-{
- size_t digestlen = qcrypto_hash_digest_len(hash);
- size_t keylen = qcrypto_cipher_get_key_len(cipher);
- if (digestlen == keylen) {
- return cipher;
- }
-
- switch (cipher) {
- case QCRYPTO_CIPHER_ALG_AES_128:
- case QCRYPTO_CIPHER_ALG_AES_192:
- case QCRYPTO_CIPHER_ALG_AES_256:
- if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_AES_128)) {
- return QCRYPTO_CIPHER_ALG_AES_128;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_AES_192)) {
- return QCRYPTO_CIPHER_ALG_AES_192;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_AES_256)) {
- return QCRYPTO_CIPHER_ALG_AES_256;
- } else {
- error_setg(errp, "No AES cipher with key size %zu available",
- digestlen);
- return 0;
- }
- break;
- case QCRYPTO_CIPHER_ALG_SERPENT_128:
- case QCRYPTO_CIPHER_ALG_SERPENT_192:
- case QCRYPTO_CIPHER_ALG_SERPENT_256:
- if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_SERPENT_128)) {
- return QCRYPTO_CIPHER_ALG_SERPENT_128;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_SERPENT_192)) {
- return QCRYPTO_CIPHER_ALG_SERPENT_192;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_SERPENT_256)) {
- return QCRYPTO_CIPHER_ALG_SERPENT_256;
- } else {
- error_setg(errp, "No Serpent cipher with key size %zu available",
- digestlen);
- return 0;
- }
- break;
- case QCRYPTO_CIPHER_ALG_TWOFISH_128:
- case QCRYPTO_CIPHER_ALG_TWOFISH_192:
- case QCRYPTO_CIPHER_ALG_TWOFISH_256:
- if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_TWOFISH_128)) {
- return QCRYPTO_CIPHER_ALG_TWOFISH_128;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_TWOFISH_192)) {
- return QCRYPTO_CIPHER_ALG_TWOFISH_192;
- } else if (digestlen == qcrypto_cipher_get_key_len(
- QCRYPTO_CIPHER_ALG_TWOFISH_256)) {
- return QCRYPTO_CIPHER_ALG_TWOFISH_256;
- } else {
- error_setg(errp, "No Twofish cipher with key size %zu available",
- digestlen);
- return 0;
- }
- break;
- default:
- error_setg(errp, "Cipher %s not supported with essiv",
- QCryptoCipherAlgorithm_lookup[cipher]);
- return 0;
- }
-}
-
-/*
- * Given a key slot, and user password, this will attempt to unlock
- * the master encryption key from the key slot.
- *
- * Returns:
- * 0 if the key slot is disabled, or key could not be decrypted
- * with the provided password
- * 1 if the key slot is enabled, and key decrypted successfully
- * with the provided password
- * -1 if a fatal error occurred loading the key
- */
-static int
-qcrypto_block_luks_load_key(QCryptoBlock *block,
- QCryptoBlockLUKSKeySlot *slot,
- const char *password,
- QCryptoCipherAlgorithm cipheralg,
- QCryptoCipherMode ciphermode,
- QCryptoHashAlgorithm hash,
- QCryptoIVGenAlgorithm ivalg,
- QCryptoCipherAlgorithm ivcipheralg,
- QCryptoHashAlgorithm ivhash,
- uint8_t *masterkey,
- size_t masterkeylen,
- QCryptoBlockReadFunc readfunc,
- void *opaque,
- Error **errp)
-{
- QCryptoBlockLUKS *luks = block->opaque;
- uint8_t *splitkey;
- size_t splitkeylen;
- uint8_t *possiblekey;
- int ret = -1;
- ssize_t rv;
- QCryptoCipher *cipher = NULL;
- uint8_t keydigest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN];
- QCryptoIVGen *ivgen = NULL;
- size_t niv;
-
- if (slot->active != QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED) {
- return 0;
- }
-
- splitkeylen = masterkeylen * slot->stripes;
- splitkey = g_new0(uint8_t, splitkeylen);
- possiblekey = g_new0(uint8_t, masterkeylen);
-
- /*
- * The user password is used to generate a (possible)
- * decryption key. This may or may not successfully
- * decrypt the master key - we just blindly assume
- * the key is correct and validate the results of
- * decryption later.
- */
- if (qcrypto_pbkdf2(hash,
- (const uint8_t *)password, strlen(password),
- slot->salt, QCRYPTO_BLOCK_LUKS_SALT_LEN,
- slot->iterations,
- possiblekey, masterkeylen,
- errp) < 0) {
- goto cleanup;
- }
-
- /*
- * We need to read the master key material from the
- * LUKS key material header. What we're reading is
- * not the raw master key, but rather the data after
- * it has been passed through AFSplit and the result
- * then encrypted.
- */
- rv = readfunc(block,
- slot->key_offset * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- splitkey, splitkeylen,
- errp,
- opaque);
- if (rv < 0) {
- goto cleanup;
- }
-
-
- /* Setup the cipher/ivgen that we'll use to try to decrypt
- * the split master key material */
- cipher = qcrypto_cipher_new(cipheralg, ciphermode,
- possiblekey, masterkeylen,
- errp);
- if (!cipher) {
- goto cleanup;
- }
-
- niv = qcrypto_cipher_get_iv_len(cipheralg,
- ciphermode);
- ivgen = qcrypto_ivgen_new(ivalg,
- ivcipheralg,
- ivhash,
- possiblekey, masterkeylen,
- errp);
- if (!ivgen) {
- goto cleanup;
- }
-
-
- /*
- * The master key needs to be decrypted in the same
- * way that the block device payload will be decrypted
- * later. In particular we'll be using the IV generator
- * to reset the encryption cipher every time the master
- * key crosses a sector boundary.
- */
- if (qcrypto_block_decrypt_helper(cipher,
- niv,
- ivgen,
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- 0,
- splitkey,
- splitkeylen,
- errp) < 0) {
- goto cleanup;
- }
-
- /*
- * Now we've decrypted the split master key, join
- * it back together to get the actual master key.
- */
- if (qcrypto_afsplit_decode(hash,
- masterkeylen,
- slot->stripes,
- splitkey,
- masterkey,
- errp) < 0) {
- goto cleanup;
- }
-
-
- /*
- * We still don't know that the masterkey we got is valid,
- * because we just blindly assumed the user's password
- * was correct. This is where we now verify it. We are
- * creating a hash of the master key using PBKDF and
- * then comparing that to the hash stored in the key slot
- * header
- */
- if (qcrypto_pbkdf2(hash,
- masterkey, masterkeylen,
- luks->header.master_key_salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- luks->header.master_key_iterations,
- keydigest, G_N_ELEMENTS(keydigest),
- errp) < 0) {
- goto cleanup;
- }
-
- if (memcmp(keydigest, luks->header.master_key_digest,
- QCRYPTO_BLOCK_LUKS_DIGEST_LEN) == 0) {
- /* Success, we got the right master key */
- ret = 1;
- goto cleanup;
- }
-
- /* Fail, user's password was not valid for this key slot,
- * tell caller to try another slot */
- ret = 0;
-
- cleanup:
- qcrypto_ivgen_free(ivgen);
- qcrypto_cipher_free(cipher);
- g_free(splitkey);
- g_free(possiblekey);
- return ret;
-}
-
-
-/*
- * Given a user password, this will iterate over all key
- * slots and try to unlock each active key slot using the
- * password until it successfully obtains a master key.
- *
- * Returns 0 if a key was loaded, -1 if no keys could be loaded
- */
-static int
-qcrypto_block_luks_find_key(QCryptoBlock *block,
- const char *password,
- QCryptoCipherAlgorithm cipheralg,
- QCryptoCipherMode ciphermode,
- QCryptoHashAlgorithm hash,
- QCryptoIVGenAlgorithm ivalg,
- QCryptoCipherAlgorithm ivcipheralg,
- QCryptoHashAlgorithm ivhash,
- uint8_t **masterkey,
- size_t *masterkeylen,
- QCryptoBlockReadFunc readfunc,
- void *opaque,
- Error **errp)
-{
- QCryptoBlockLUKS *luks = block->opaque;
- size_t i;
- int rv;
-
- *masterkey = g_new0(uint8_t, luks->header.key_bytes);
- *masterkeylen = luks->header.key_bytes;
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- rv = qcrypto_block_luks_load_key(block,
- &luks->header.key_slots[i],
- password,
- cipheralg,
- ciphermode,
- hash,
- ivalg,
- ivcipheralg,
- ivhash,
- *masterkey,
- *masterkeylen,
- readfunc,
- opaque,
- errp);
- if (rv < 0) {
- goto error;
- }
- if (rv == 1) {
- return 0;
- }
- }
-
- error_setg(errp, "Invalid password, cannot unlock any keyslot");
-
- error:
- g_free(*masterkey);
- *masterkey = NULL;
- *masterkeylen = 0;
- return -1;
-}
-
-
-static int
-qcrypto_block_luks_open(QCryptoBlock *block,
- QCryptoBlockOpenOptions *options,
- QCryptoBlockReadFunc readfunc,
- void *opaque,
- unsigned int flags,
- Error **errp)
-{
- QCryptoBlockLUKS *luks;
- Error *local_err = NULL;
- int ret = 0;
- size_t i;
- ssize_t rv;
- uint8_t *masterkey = NULL;
- size_t masterkeylen;
- char *ivgen_name, *ivhash_name;
- QCryptoCipherMode ciphermode;
- QCryptoCipherAlgorithm cipheralg;
- QCryptoIVGenAlgorithm ivalg;
- QCryptoCipherAlgorithm ivcipheralg;
- QCryptoHashAlgorithm hash;
- QCryptoHashAlgorithm ivhash;
- char *password = NULL;
-
- if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) {
- if (!options->u.luks.key_secret) {
- error_setg(errp, "Parameter 'key-secret' is required for cipher");
- return -1;
- }
- password = qcrypto_secret_lookup_as_utf8(
- options->u.luks.key_secret, errp);
- if (!password) {
- return -1;
- }
- }
-
- luks = g_new0(QCryptoBlockLUKS, 1);
- block->opaque = luks;
-
- /* Read the entire LUKS header, minus the key material from
- * the underlying device */
- rv = readfunc(block, 0,
- (uint8_t *)&luks->header,
- sizeof(luks->header),
- errp,
- opaque);
- if (rv < 0) {
- ret = rv;
- goto fail;
- }
-
- /* The header is always stored in big-endian format, so
- * convert everything to native */
- be16_to_cpus(&luks->header.version);
- be32_to_cpus(&luks->header.payload_offset);
- be32_to_cpus(&luks->header.key_bytes);
- be32_to_cpus(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- be32_to_cpus(&luks->header.key_slots[i].active);
- be32_to_cpus(&luks->header.key_slots[i].iterations);
- be32_to_cpus(&luks->header.key_slots[i].key_offset);
- be32_to_cpus(&luks->header.key_slots[i].stripes);
- }
-
- if (memcmp(luks->header.magic, qcrypto_block_luks_magic,
- QCRYPTO_BLOCK_LUKS_MAGIC_LEN) != 0) {
- error_setg(errp, "Volume is not in LUKS format");
- ret = -EINVAL;
- goto fail;
- }
- if (luks->header.version != QCRYPTO_BLOCK_LUKS_VERSION) {
- error_setg(errp, "LUKS version %" PRIu32 " is not supported",
- luks->header.version);
- ret = -ENOTSUP;
- goto fail;
- }
-
- /*
- * The cipher_mode header contains a string that we have
- * to further parse, of the format
- *
- * <cipher-mode>-<iv-generator>[:<iv-hash>]
- *
- * eg cbc-essiv:sha256, cbc-plain64
- */
- ivgen_name = strchr(luks->header.cipher_mode, '-');
- if (!ivgen_name) {
- ret = -EINVAL;
- error_setg(errp, "Unexpected cipher mode string format %s",
- luks->header.cipher_mode);
- goto fail;
- }
- *ivgen_name = '\0';
- ivgen_name++;
-
- ivhash_name = strchr(ivgen_name, ':');
- if (!ivhash_name) {
- ivhash = 0;
- } else {
- *ivhash_name = '\0';
- ivhash_name++;
-
- ivhash = qcrypto_block_luks_hash_name_lookup(ivhash_name,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
- }
-
- ciphermode = qcrypto_block_luks_cipher_mode_lookup(luks->header.cipher_mode,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
-
- cipheralg = qcrypto_block_luks_cipher_name_lookup(luks->header.cipher_name,
- ciphermode,
- luks->header.key_bytes,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
-
- hash = qcrypto_block_luks_hash_name_lookup(luks->header.hash_spec,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
-
- ivalg = qcrypto_block_luks_ivgen_name_lookup(ivgen_name,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
-
- if (ivalg == QCRYPTO_IVGEN_ALG_ESSIV) {
- ivcipheralg = qcrypto_block_luks_essiv_cipher(cipheralg,
- ivhash,
- &local_err);
- if (local_err) {
- ret = -ENOTSUP;
- error_propagate(errp, local_err);
- goto fail;
- }
- } else {
- ivcipheralg = cipheralg;
- }
-
- if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) {
- /* Try to find which key slot our password is valid for
- * and unlock the master key from that slot.
- */
- if (qcrypto_block_luks_find_key(block,
- password,
- cipheralg, ciphermode,
- hash,
- ivalg,
- ivcipheralg,
- ivhash,
- &masterkey, &masterkeylen,
- readfunc, opaque,
- errp) < 0) {
- ret = -EACCES;
- goto fail;
- }
-
- /* We have a valid master key now, so can setup the
- * block device payload decryption objects
- */
- block->kdfhash = hash;
- block->niv = qcrypto_cipher_get_iv_len(cipheralg,
- ciphermode);
- block->ivgen = qcrypto_ivgen_new(ivalg,
- ivcipheralg,
- ivhash,
- masterkey, masterkeylen,
- errp);
- if (!block->ivgen) {
- ret = -ENOTSUP;
- goto fail;
- }
-
- block->cipher = qcrypto_cipher_new(cipheralg,
- ciphermode,
- masterkey, masterkeylen,
- errp);
- if (!block->cipher) {
- ret = -ENOTSUP;
- goto fail;
- }
- }
-
- block->payload_offset = luks->header.payload_offset *
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
-
- g_free(masterkey);
- g_free(password);
-
- return 0;
-
- fail:
- g_free(masterkey);
- qcrypto_cipher_free(block->cipher);
- qcrypto_ivgen_free(block->ivgen);
- g_free(luks);
- g_free(password);
- return ret;
-}
-
-
-static int
-qcrypto_block_luks_uuid_gen(uint8_t *uuidstr, Error **errp)
-{
-#ifdef CONFIG_UUID
- uuid_t uuid;
- uuid_generate(uuid);
- uuid_unparse(uuid, (char *)uuidstr);
- return 0;
-#else
- error_setg(errp, "Unable to generate uuids on this platform");
- return -1;
-#endif
-}
-
-static int
-qcrypto_block_luks_create(QCryptoBlock *block,
- QCryptoBlockCreateOptions *options,
- QCryptoBlockInitFunc initfunc,
- QCryptoBlockWriteFunc writefunc,
- void *opaque,
- Error **errp)
-{
- QCryptoBlockLUKS *luks;
- QCryptoBlockCreateOptionsLUKS luks_opts;
- Error *local_err = NULL;
- uint8_t *masterkey = NULL;
- uint8_t *slotkey = NULL;
- uint8_t *splitkey = NULL;
- size_t splitkeylen = 0;
- size_t i;
- QCryptoCipher *cipher = NULL;
- QCryptoIVGen *ivgen = NULL;
- char *password;
- const char *cipher_alg;
- const char *cipher_mode;
- const char *ivgen_alg;
- const char *ivgen_hash_alg = NULL;
- const char *hash_alg;
- char *cipher_mode_spec = NULL;
- QCryptoCipherAlgorithm ivcipheralg = 0;
-
- memcpy(&luks_opts, &options->u.luks, sizeof(luks_opts));
- if (!luks_opts.has_cipher_alg) {
- luks_opts.cipher_alg = QCRYPTO_CIPHER_ALG_AES_256;
- }
- if (!luks_opts.has_cipher_mode) {
- luks_opts.cipher_mode = QCRYPTO_CIPHER_MODE_XTS;
- }
- if (!luks_opts.has_ivgen_alg) {
- luks_opts.ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64;
- }
- if (!luks_opts.has_hash_alg) {
- luks_opts.hash_alg = QCRYPTO_HASH_ALG_SHA256;
- }
-
- if (!options->u.luks.key_secret) {
- error_setg(errp, "Parameter 'key-secret' is required for cipher");
- return -1;
- }
- password = qcrypto_secret_lookup_as_utf8(luks_opts.key_secret, errp);
- if (!password) {
- return -1;
- }
-
- luks = g_new0(QCryptoBlockLUKS, 1);
- block->opaque = luks;
-
- memcpy(luks->header.magic, qcrypto_block_luks_magic,
- QCRYPTO_BLOCK_LUKS_MAGIC_LEN);
-
- /* We populate the header in native endianness initially and
- * then convert everything to big endian just before writing
- * it out to disk
- */
- luks->header.version = QCRYPTO_BLOCK_LUKS_VERSION;
- if (qcrypto_block_luks_uuid_gen(luks->header.uuid,
- errp) < 0) {
- goto error;
- }
-
- cipher_alg = qcrypto_block_luks_cipher_alg_lookup(luks_opts.cipher_alg,
- errp);
- if (!cipher_alg) {
- goto error;
- }
-
- cipher_mode = QCryptoCipherMode_lookup[luks_opts.cipher_mode];
- ivgen_alg = QCryptoIVGenAlgorithm_lookup[luks_opts.ivgen_alg];
- if (luks_opts.has_ivgen_hash_alg) {
- ivgen_hash_alg = QCryptoHashAlgorithm_lookup[luks_opts.ivgen_hash_alg];
- cipher_mode_spec = g_strdup_printf("%s-%s:%s", cipher_mode, ivgen_alg,
- ivgen_hash_alg);
- } else {
- cipher_mode_spec = g_strdup_printf("%s-%s", cipher_mode, ivgen_alg);
- }
- hash_alg = QCryptoHashAlgorithm_lookup[luks_opts.hash_alg];
-
-
- if (strlen(cipher_alg) >= QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN) {
- error_setg(errp, "Cipher name '%s' is too long for LUKS header",
- cipher_alg);
- goto error;
- }
- if (strlen(cipher_mode_spec) >= QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN) {
- error_setg(errp, "Cipher mode '%s' is too long for LUKS header",
- cipher_mode_spec);
- goto error;
- }
- if (strlen(hash_alg) >= QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN) {
- error_setg(errp, "Hash name '%s' is too long for LUKS header",
- hash_alg);
- goto error;
- }
-
- if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
- ivcipheralg = qcrypto_block_luks_essiv_cipher(luks_opts.cipher_alg,
- luks_opts.ivgen_hash_alg,
- &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto error;
- }
- } else {
- ivcipheralg = luks_opts.cipher_alg;
- }
-
- strcpy(luks->header.cipher_name, cipher_alg);
- strcpy(luks->header.cipher_mode, cipher_mode_spec);
- strcpy(luks->header.hash_spec, hash_alg);
-
- luks->header.key_bytes = qcrypto_cipher_get_key_len(luks_opts.cipher_alg);
- if (luks_opts.cipher_mode == QCRYPTO_CIPHER_MODE_XTS) {
- luks->header.key_bytes *= 2;
- }
-
- /* Generate the salt used for hashing the master key
- * with PBKDF later
- */
- if (qcrypto_random_bytes(luks->header.master_key_salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- errp) < 0) {
- goto error;
- }
-
- /* Generate random master key */
- masterkey = g_new0(uint8_t, luks->header.key_bytes);
- if (qcrypto_random_bytes(masterkey,
- luks->header.key_bytes, errp) < 0) {
- goto error;
- }
-
-
- /* Setup the block device payload encryption objects */
- block->cipher = qcrypto_cipher_new(luks_opts.cipher_alg,
- luks_opts.cipher_mode,
- masterkey, luks->header.key_bytes,
- errp);
- if (!block->cipher) {
- goto error;
- }
-
- block->kdfhash = luks_opts.hash_alg;
- block->niv = qcrypto_cipher_get_iv_len(luks_opts.cipher_alg,
- luks_opts.cipher_mode);
- block->ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg,
- ivcipheralg,
- luks_opts.ivgen_hash_alg,
- masterkey, luks->header.key_bytes,
- errp);
-
- if (!block->ivgen) {
- goto error;
- }
-
-
- /* Determine how many iterations we need to hash the master
- * key, in order to have 1 second of compute time used
- */
- luks->header.master_key_iterations =
- qcrypto_pbkdf2_count_iters(luks_opts.hash_alg,
- masterkey, luks->header.key_bytes,
- luks->header.master_key_salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto error;
- }
-
- /* Why /= 8 ? That matches cryptsetup, but there's no
- * explanation why they chose /= 8... Probably so that
- * if all 8 keyslots are active we only spend 1 second
- * in total time to check all keys */
- luks->header.master_key_iterations /= 8;
- luks->header.master_key_iterations = MAX(
- luks->header.master_key_iterations,
- QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS);
-
-
- /* Hash the master key, saving the result in the LUKS
- * header. This hash is used when opening the encrypted
- * device to verify that the user password unlocked a
- * valid master key
- */
- if (qcrypto_pbkdf2(luks_opts.hash_alg,
- masterkey, luks->header.key_bytes,
- luks->header.master_key_salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- luks->header.master_key_iterations,
- luks->header.master_key_digest,
- QCRYPTO_BLOCK_LUKS_DIGEST_LEN,
- errp) < 0) {
- goto error;
- }
-
-
- /* Although LUKS has multiple key slots, we're just going
- * to use the first key slot */
- splitkeylen = luks->header.key_bytes * QCRYPTO_BLOCK_LUKS_STRIPES;
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- luks->header.key_slots[i].active = i == 0 ?
- QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED :
- QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED;
- luks->header.key_slots[i].stripes = QCRYPTO_BLOCK_LUKS_STRIPES;
-
- /* This calculation doesn't match that shown in the spec,
- * but instead follows the cryptsetup implementation.
- */
- luks->header.key_slots[i].key_offset =
- (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) +
- (ROUND_UP(((splitkeylen + (QCRYPTO_BLOCK_LUKS_SECTOR_SIZE - 1)) /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE),
- (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) * i);
- }
-
- if (qcrypto_random_bytes(luks->header.key_slots[0].salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- errp) < 0) {
- goto error;
- }
-
- /* Again we determine how many iterations are required to
- * hash the user password while consuming 1 second of compute
- * time */
- luks->header.key_slots[0].iterations =
- qcrypto_pbkdf2_count_iters(luks_opts.hash_alg,
- (uint8_t *)password, strlen(password),
- luks->header.key_slots[0].salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- goto error;
- }
- /* Why /= 2 ? That matches cryptsetup, but there's no
- * explanation why they chose /= 2... */
- luks->header.key_slots[0].iterations /= 2;
- luks->header.key_slots[0].iterations = MAX(
- luks->header.key_slots[0].iterations,
- QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS);
-
-
- /* Generate a key that we'll use to encrypt the master
- * key, from the user's password
- */
- slotkey = g_new0(uint8_t, luks->header.key_bytes);
- if (qcrypto_pbkdf2(luks_opts.hash_alg,
- (uint8_t *)password, strlen(password),
- luks->header.key_slots[0].salt,
- QCRYPTO_BLOCK_LUKS_SALT_LEN,
- luks->header.key_slots[0].iterations,
- slotkey, luks->header.key_bytes,
- errp) < 0) {
- goto error;
- }
-
-
- /* Setup the encryption objects needed to encrypt the
- * master key material
- */
- cipher = qcrypto_cipher_new(luks_opts.cipher_alg,
- luks_opts.cipher_mode,
- slotkey, luks->header.key_bytes,
- errp);
- if (!cipher) {
- goto error;
- }
-
- ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg,
- ivcipheralg,
- luks_opts.ivgen_hash_alg,
- slotkey, luks->header.key_bytes,
- errp);
- if (!ivgen) {
- goto error;
- }
-
- /* Before storing the master key, we need to vastly
- * increase its size, as protection against forensic
- * disk data recovery */
- splitkey = g_new0(uint8_t, splitkeylen);
-
- if (qcrypto_afsplit_encode(luks_opts.hash_alg,
- luks->header.key_bytes,
- luks->header.key_slots[0].stripes,
- masterkey,
- splitkey,
- errp) < 0) {
- goto error;
- }
-
- /* Now we encrypt the split master key with the key generated
- * from the user's password, before storing it */
- if (qcrypto_block_encrypt_helper(cipher, block->niv, ivgen,
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- 0,
- splitkey,
- splitkeylen,
- errp) < 0) {
- goto error;
- }
-
-
- /* The total size of the LUKS headers is the partition header + key
- * slot headers, rounded up to the nearest sector, combined with
- * the size of each master key material region, also rounded up
- * to the nearest sector */
- luks->header.payload_offset =
- (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) +
- (ROUND_UP(((splitkeylen + (QCRYPTO_BLOCK_LUKS_SECTOR_SIZE - 1)) /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE),
- (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) *
- QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS);
-
- block->payload_offset = luks->header.payload_offset *
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
-
- /* Reserve header space to match payload offset */
- initfunc(block, block->payload_offset, &local_err, opaque);
- if (local_err) {
- error_propagate(errp, local_err);
- goto error;
- }
-
- /* Everything on disk uses Big Endian, so flip header fields
- * before writing them */
- cpu_to_be16s(&luks->header.version);
- cpu_to_be32s(&luks->header.payload_offset);
- cpu_to_be32s(&luks->header.key_bytes);
- cpu_to_be32s(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- cpu_to_be32s(&luks->header.key_slots[i].active);
- cpu_to_be32s(&luks->header.key_slots[i].iterations);
- cpu_to_be32s(&luks->header.key_slots[i].key_offset);
- cpu_to_be32s(&luks->header.key_slots[i].stripes);
- }
-
-
- /* Write out the partition header and key slot headers */
- writefunc(block, 0,
- (const uint8_t *)&luks->header,
- sizeof(luks->header),
- &local_err,
- opaque);
-
- /* Delay checking local_err until we've byte-swapped */
-
- /* Byte swap the header back to native, in case we need
- * to read it again later */
- be16_to_cpus(&luks->header.version);
- be32_to_cpus(&luks->header.payload_offset);
- be32_to_cpus(&luks->header.key_bytes);
- be32_to_cpus(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- be32_to_cpus(&luks->header.key_slots[i].active);
- be32_to_cpus(&luks->header.key_slots[i].iterations);
- be32_to_cpus(&luks->header.key_slots[i].key_offset);
- be32_to_cpus(&luks->header.key_slots[i].stripes);
- }
-
- if (local_err) {
- error_propagate(errp, local_err);
- goto error;
- }
-
- /* Write out the master key material, starting at the
- * sector immediately following the partition header. */
- if (writefunc(block,
- luks->header.key_slots[0].key_offset *
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- splitkey, splitkeylen,
- errp,
- opaque) != splitkeylen) {
- goto error;
- }
-
- memset(masterkey, 0, luks->header.key_bytes);
- g_free(masterkey);
- memset(slotkey, 0, luks->header.key_bytes);
- g_free(slotkey);
- g_free(splitkey);
- g_free(password);
- g_free(cipher_mode_spec);
-
- qcrypto_ivgen_free(ivgen);
- qcrypto_cipher_free(cipher);
-
- return 0;
-
- error:
- if (masterkey) {
- memset(masterkey, 0, luks->header.key_bytes);
- }
- g_free(masterkey);
- if (slotkey) {
- memset(slotkey, 0, luks->header.key_bytes);
- }
- g_free(slotkey);
- g_free(splitkey);
- g_free(password);
- g_free(cipher_mode_spec);
-
- qcrypto_ivgen_free(ivgen);
- qcrypto_cipher_free(cipher);
-
- g_free(luks);
- return -1;
-}
-
-
-static void qcrypto_block_luks_cleanup(QCryptoBlock *block)
-{
- g_free(block->opaque);
-}
-
-
-static int
-qcrypto_block_luks_decrypt(QCryptoBlock *block,
- uint64_t startsector,
- uint8_t *buf,
- size_t len,
- Error **errp)
-{
- return qcrypto_block_decrypt_helper(block->cipher,
- block->niv, block->ivgen,
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- startsector, buf, len, errp);
-}
-
-
-static int
-qcrypto_block_luks_encrypt(QCryptoBlock *block,
- uint64_t startsector,
- uint8_t *buf,
- size_t len,
- Error **errp)
-{
- return qcrypto_block_encrypt_helper(block->cipher,
- block->niv, block->ivgen,
- QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
- startsector, buf, len, errp);
-}
-
-
-const QCryptoBlockDriver qcrypto_block_driver_luks = {
- .open = qcrypto_block_luks_open,
- .create = qcrypto_block_luks_create,
- .cleanup = qcrypto_block_luks_cleanup,
- .decrypt = qcrypto_block_luks_decrypt,
- .encrypt = qcrypto_block_luks_encrypt,
- .has_format = qcrypto_block_luks_has_format,
-};