/*
- * TCRYPT compatible volume handling
+ * TCRYPT (TrueCrypt-compatible) and VeraCrypt volume handling
*
- * Copyright (C) 2012, Red Hat, Inc. All rights reserved.
- * Copyright (C) 2012, Milan Broz
+ * Copyright (C) 2012-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2012-2023 Milan Broz
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * This file 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 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This file 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.
+ * 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 General Public License
- * along with this program; if not, write to the Free Software
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <fcntl.h>
-#include <assert.h>
#include "libcryptsetup.h"
#include "tcrypt.h"
#include "internal.h"
/* TCRYPT PBKDF variants */
-static struct {
- char *name;
- char *hash;
+static const struct {
+ unsigned int legacy:1;
+ unsigned int veracrypt:1;
+ const char *name;
+ const char *hash;
unsigned int iterations;
+ uint32_t veracrypt_pim_const;
+ uint32_t veracrypt_pim_mult;
} tcrypt_kdf[] = {
- { "pbkdf2", "ripemd160", 2000 },
- { "pbkdf2", "ripemd160", 1000 },
- { "pbkdf2", "sha512", 1000 },
- { "pbkdf2", "whirlpool", 1000 },
- { NULL, NULL, 0 }
+ { 0, 0, "pbkdf2", "ripemd160", 2000, 0, 0 },
+ { 0, 0, "pbkdf2", "ripemd160", 1000, 0, 0 },
+ { 0, 0, "pbkdf2", "sha512", 1000, 0, 0 },
+ { 0, 0, "pbkdf2", "whirlpool", 1000, 0, 0 },
+ { 1, 0, "pbkdf2", "sha1", 2000, 0, 0 },
+ { 0, 1, "pbkdf2", "sha512", 500000, 15000, 1000 },
+ { 0, 1, "pbkdf2", "whirlpool", 500000, 15000, 1000 },
+ { 0, 1, "pbkdf2", "sha256", 500000, 15000, 1000 }, // VeraCrypt 1.0f
+ { 0, 1, "pbkdf2", "sha256", 200000, 0, 2048 }, // boot only
+ { 0, 1, "pbkdf2", "ripemd160", 655331, 15000, 1000 },
+ { 0, 1, "pbkdf2", "ripemd160", 327661, 0, 2048 }, // boot only
+ { 0, 1, "pbkdf2", "stribog512",500000, 15000, 1000 },
+// { 0, 1, "pbkdf2", "stribog512",200000, 0, 2048 }, // boot only
+ { 0, 0, NULL, NULL, 0, 0, 0 }
};
-/* TCRYPT cipher variants */
-static struct {
- const char *cipher[3];
+struct tcrypt_alg {
+ const char *name;
+ unsigned int key_size;
+ unsigned int iv_size;
+ unsigned int key_offset;
+ unsigned int iv_offset; /* or tweak key offset */
+ unsigned int key_extra_size;
+};
+
+struct tcrypt_algs {
+ unsigned int legacy:1;
+ unsigned int chain_count;
+ unsigned int chain_key_size;
+ const char *long_name;
const char *mode;
- int key_size;
-} tcrypt_cipher[] = {
- { { "aes", NULL, NULL }, "xts-plain64", 64 },
- { { "twofish", NULL, NULL }, "xts-plain64", 64 },
- { { "serpent", NULL, NULL }, "xts-plain64", 64 },
- { { "aes", "twofish", "serpent" }, "xts-plain64", 64 },
- { { "serpent", "twofish", "aes" }, "xts-plain64", 64 },
- { { "twofish", "aes", NULL }, "xts-plain64", 64 },
- { { "aes", "serpent", NULL }, "xts-plain64", 64 },
- { { "serpent", "twofish", NULL }, "xts-plain64", 64 },
- { { "aes", NULL, NULL }, "lrw-benbi", 48 },
- { { "twofish", NULL, NULL }, "lrw-benbi", 48 },
- { { "serpent", NULL, NULL }, "lrw-benbi", 48 },
- { { "aes", "twofish", "serpent" }, "lrw-benbi", 48 },
- { { "serpent", "twofish", "aes" }, "lrw-benbi", 48 },
- { { "twofish", "aes", NULL }, "lrw-benbi", 48 },
- { { "aes", "serpent", NULL }, "lrw-benbi", 48 },
- { { "serpent", "twofish", NULL }, "lrw-benbi", 48 },
- { { NULL, NULL, NULL }, NULL, 0 }
+ struct tcrypt_alg cipher[3];
};
-static void hdr_info(struct crypt_device *cd, struct tcrypt_phdr *hdr,
- struct crypt_params_tcrypt *params)
-{
- log_dbg("Version: %d, required %d", (int)hdr->d.version, (int)hdr->d.version_tc);
-
- log_dbg("Hidden size: %" PRIu64, hdr->d.hidden_volume_size);
- log_dbg("Volume size: %" PRIu64, hdr->d.volume_size);
-
- log_dbg("Sector size: %" PRIu64, hdr->d.sector_size);
- log_dbg("Flags: %d", (int)hdr->d.flags);
- log_dbg("MK: offset %d, size %d", (int)hdr->d.mk_offset, (int)hdr->d.mk_size);
- log_dbg("KDF: PBKDF2, hash %s", params->hash_name);
- log_dbg("Cipher: %s%s%s%s%s-%s",
- params->cipher[0],
- params->cipher[1] ? "-" : "", params->cipher[1] ?: "",
- params->cipher[2] ? "-" : "", params->cipher[2] ?: "",
- params->mode);
-}
+/* TCRYPT cipher variants */
+static struct tcrypt_algs tcrypt_cipher[] = {
+/* XTS mode */
+{0,1,64,"aes","xts-plain64",
+ {{"aes", 64,16,0,32,0}}},
+{0,1,64,"serpent","xts-plain64",
+ {{"serpent",64,16,0,32,0}}},
+{0,1,64,"twofish","xts-plain64",
+ {{"twofish",64,16,0,32,0}}},
+{0,2,128,"twofish-aes","xts-plain64",
+ {{"twofish",64,16, 0,64,0},
+ {"aes", 64,16,32,96,0}}},
+{0,3,192,"serpent-twofish-aes","xts-plain64",
+ {{"serpent",64,16, 0, 96,0},
+ {"twofish",64,16,32,128,0},
+ {"aes", 64,16,64,160,0}}},
+{0,2,128,"aes-serpent","xts-plain64",
+ {{"aes", 64,16, 0,64,0},
+ {"serpent",64,16,32,96,0}}},
+{0,3,192,"aes-twofish-serpent","xts-plain64",
+ {{"aes", 64,16, 0, 96,0},
+ {"twofish",64,16,32,128,0},
+ {"serpent",64,16,64,160,0}}},
+{0,2,128,"serpent-twofish","xts-plain64",
+ {{"serpent",64,16, 0,64,0},
+ {"twofish",64,16,32,96,0}}},
+{0,1,64,"camellia","xts-plain64",
+ {{"camellia", 64,16,0,32,0}}},
+{0,1,64,"kuznyechik","xts-plain64",
+ {{"kuznyechik", 64,16,0,32,0}}},
+{0,2,128,"kuznyechik-camellia","xts-plain64",
+ {{"kuznyechik",64,16, 0,64,0},
+ {"camellia", 64,16,32,96,0}}},
+{0,2,128,"twofish-kuznyechik","xts-plain64",
+ {{"twofish", 64,16, 0,64,0},
+ {"kuznyechik",64,16,32,96,0}}},
+{0,2,128,"serpent-camellia","xts-plain64",
+ {{"serpent", 64,16, 0,64,0},
+ {"camellia", 64,16,32,96,0}}},
+{0,2,128,"aes-kuznyechik","xts-plain64",
+ {{"aes", 64,16, 0,64,0},
+ {"kuznyechik",64,16,32,96,0}}},
+{0,3,192,"camellia-serpent-kuznyechik","xts-plain64",
+ {{"camellia", 64,16, 0, 96,0},
+ {"serpent", 64,16,32,128,0},
+ {"kuznyechik",64,16,64,160,0}}},
+
+/* LRW mode */
+{0,1,48,"aes","lrw-benbi",
+ {{"aes", 48,16,32,0,0}}},
+{0,1,48,"serpent","lrw-benbi",
+ {{"serpent",48,16,32,0,0}}},
+{0,1,48,"twofish","lrw-benbi",
+ {{"twofish",48,16,32,0,0}}},
+{0,2,96,"twofish-aes","lrw-benbi",
+ {{"twofish",48,16,32,0,0},
+ {"aes", 48,16,64,0,0}}},
+{0,3,144,"serpent-twofish-aes","lrw-benbi",
+ {{"serpent",48,16,32,0,0},
+ {"twofish",48,16,64,0,0},
+ {"aes", 48,16,96,0,0}}},
+{0,2,96,"aes-serpent","lrw-benbi",
+ {{"aes", 48,16,32,0,0},
+ {"serpent",48,16,64,0,0}}},
+{0,3,144,"aes-twofish-serpent","lrw-benbi",
+ {{"aes", 48,16,32,0,0},
+ {"twofish",48,16,64,0,0},
+ {"serpent",48,16,96,0,0}}},
+{0,2,96,"serpent-twofish", "lrw-benbi",
+ {{"serpent",48,16,32,0,0},
+ {"twofish",48,16,64,0,0}}},
+
+/* Kernel LRW block size is fixed to 16 bytes for GF(2^128)
+ * thus cannot be used with blowfish where block is 8 bytes.
+ * There also no GF(2^64) support.
+{1,1,64,"blowfish_le","lrw-benbi",
+ {{"blowfish_le",64,8,32,0,0}}},
+{1,2,112,"blowfish_le-aes","lrw-benbi",
+ {{"blowfish_le",64, 8,32,0,0},
+ {"aes", 48,16,88,0,0}}},
+{1,3,160,"serpent-blowfish_le-aes","lrw-benbi",
+ {{"serpent", 48,16, 32,0,0},
+ {"blowfish_le",64, 8, 64,0,0},
+ {"aes", 48,16,120,0,0}}},*/
+
+/*
+ * CBC + "outer" CBC (both with whitening)
+ * chain_key_size: alg_keys_bytes + IV_seed_bytes + whitening_bytes
+ */
+{1,1,32+16+16,"aes","cbc-tcw",
+ {{"aes", 32,16,32,0,32}}},
+{1,1,32+16+16,"serpent","cbc-tcw",
+ {{"serpent",32,16,32,0,32}}},
+{1,1,32+16+16,"twofish","cbc-tcw",
+ {{"twofish",32,16,32,0,32}}},
+{1,2,64+16+16,"twofish-aes","cbci-tcrypt",
+ {{"twofish",32,16,32,0,0},
+ {"aes", 32,16,64,0,32}}},
+{1,3,96+16+16,"serpent-twofish-aes","cbci-tcrypt",
+ {{"serpent",32,16,32,0,0},
+ {"twofish",32,16,64,0,0},
+ {"aes", 32,16,96,0,32}}},
+{1,2,64+16+16,"aes-serpent","cbci-tcrypt",
+ {{"aes", 32,16,32,0,0},
+ {"serpent",32,16,64,0,32}}},
+{1,3,96+16+16,"aes-twofish-serpent", "cbci-tcrypt",
+ {{"aes", 32,16,32,0,0},
+ {"twofish",32,16,64,0,0},
+ {"serpent",32,16,96,0,32}}},
+{1,2,64+16+16,"serpent-twofish", "cbci-tcrypt",
+ {{"serpent",32,16,32,0,0},
+ {"twofish",32,16,64,0,32}}},
+{1,1,16+8+16,"cast5","cbc-tcw",
+ {{"cast5", 16,8,32,0,24}}},
+{1,1,24+8+16,"des3_ede","cbc-tcw",
+ {{"des3_ede",24,8,32,0,24}}},
+{1,1,56+8+16,"blowfish_le","cbc-tcrypt",
+ {{"blowfish_le",56,8,32,0,24}}},
+{1,2,88+16+16,"blowfish_le-aes","cbc-tcrypt",
+ {{"blowfish_le",56, 8,32,0,0},
+ {"aes", 32,16,88,0,32}}},
+{1,3,120+16+16,"serpent-blowfish_le-aes","cbc-tcrypt",
+ {{"serpent", 32,16, 32,0,0},
+ {"blowfish_le",56, 8, 64,0,0},
+ {"aes", 32,16,120,0,32}}},
+{}
+};
-static int hdr_from_disk(struct tcrypt_phdr *hdr,
- struct crypt_params_tcrypt *params,
- int kdf_index, int cipher_index)
+static int TCRYPT_hdr_from_disk(struct crypt_device *cd,
+ struct tcrypt_phdr *hdr,
+ struct crypt_params_tcrypt *params,
+ int kdf_index, int cipher_index)
{
uint32_t crc32;
size_t size;
crc32 = crypt_crc32(~0, (unsigned char*)&hdr->d, size) ^ ~0;
if (be16_to_cpu(hdr->d.version) > 3 &&
crc32 != be32_to_cpu(hdr->d.header_crc32)) {
- log_dbg("TCRYPT header CRC32 mismatch.");
+ log_dbg(cd, "TCRYPT header CRC32 mismatch.");
return -EINVAL;
}
/* Check CRC32 of keys */
crc32 = crypt_crc32(~0, (unsigned char*)hdr->d.keys, sizeof(hdr->d.keys)) ^ ~0;
if (crc32 != be32_to_cpu(hdr->d.keys_crc32)) {
- log_dbg("TCRYPT keys CRC32 mismatch.");
+ log_dbg(cd, "TCRYPT keys CRC32 mismatch.");
return -EINVAL;
}
/* Convert header to cpu format */
hdr->d.version = be16_to_cpu(hdr->d.version);
- hdr->d.version_tc = le16_to_cpu(hdr->d.version_tc); // ???
+ hdr->d.version_tc = be16_to_cpu(hdr->d.version_tc);
hdr->d.keys_crc32 = be32_to_cpu(hdr->d.keys_crc32);
/* Set params */
params->passphrase = NULL;
params->passphrase_size = 0;
-
params->hash_name = tcrypt_kdf[kdf_index].hash;
-
- params->cipher[0] = tcrypt_cipher[cipher_index].cipher[0];
- params->cipher[1] = tcrypt_cipher[cipher_index].cipher[1];
- params->cipher[2] = tcrypt_cipher[cipher_index].cipher[2];
- params->mode = tcrypt_cipher[cipher_index].mode;
- params->key_size = tcrypt_cipher[cipher_index].key_size;
+ params->key_size = tcrypt_cipher[cipher_index].chain_key_size;
+ params->cipher = tcrypt_cipher[cipher_index].long_name;
+ params->mode = tcrypt_cipher[cipher_index].mode;
return 0;
}
-static int decrypt_hdr_one(const char *name, const char *mode,
- const char *key, size_t key_size,
- struct tcrypt_phdr *hdr)
+/*
+ * Kernel implements just big-endian version of blowfish, hack it here
+ */
+static void TCRYPT_swab_le(char *buf)
{
+ uint32_t *l = VOIDP_CAST(uint32_t*)&buf[0];
+ uint32_t *r = VOIDP_CAST(uint32_t*)&buf[4];
+ *l = swab32(*l);
+ *r = swab32(*r);
+}
+
+static int decrypt_blowfish_le_cbc(struct tcrypt_alg *alg,
+ const char *key, char *buf)
+{
+ int bs = alg->iv_size;
+ char iv[8], iv_old[8];
+ struct crypt_cipher *cipher = NULL;
+ int i, j, r;
+
+ assert(bs == 8);
+
+ r = crypt_cipher_init(&cipher, "blowfish", "ecb",
+ &key[alg->key_offset], alg->key_size);
+ if (r < 0)
+ return r;
+
+ memcpy(iv, &key[alg->iv_offset], alg->iv_size);
+ for (i = 0; i < TCRYPT_HDR_LEN; i += bs) {
+ memcpy(iv_old, &buf[i], bs);
+ TCRYPT_swab_le(&buf[i]);
+ r = crypt_cipher_decrypt(cipher, &buf[i], &buf[i],
+ bs, NULL, 0);
+ TCRYPT_swab_le(&buf[i]);
+ if (r < 0)
+ break;
+ for (j = 0; j < bs; j++)
+ buf[i + j] ^= iv[j];
+ memcpy(iv, iv_old, bs);
+ }
+
+ crypt_cipher_destroy(cipher);
+ crypt_safe_memzero(iv, bs);
+ crypt_safe_memzero(iv_old, bs);
+ return r;
+}
+
+static void TCRYPT_remove_whitening(char *buf, const char *key)
+{
+ int j;
+
+ for (j = 0; j < TCRYPT_HDR_LEN; j++)
+ buf[j] ^= key[j % 8];
+}
+
+static void TCRYPT_copy_key(struct tcrypt_alg *alg, const char *mode,
+ char *out_key, const char *key)
+{
+ int ks2;
+ if (!strncmp(mode, "xts", 3)) {
+ ks2 = alg->key_size / 2;
+ memcpy(out_key, &key[alg->key_offset], ks2);
+ memcpy(&out_key[ks2], &key[alg->iv_offset], ks2);
+ } else if (!strncmp(mode, "lrw", 3)) {
+ ks2 = alg->key_size - TCRYPT_LRW_IKEY_LEN;
+ memcpy(out_key, &key[alg->key_offset], ks2);
+ memcpy(&out_key[ks2], key, TCRYPT_LRW_IKEY_LEN);
+ } else if (!strncmp(mode, "cbc", 3)) {
+ memcpy(out_key, &key[alg->key_offset], alg->key_size);
+ /* IV + whitening */
+ memcpy(&out_key[alg->key_size], &key[alg->iv_offset],
+ alg->key_extra_size);
+ }
+}
+
+static int TCRYPT_decrypt_hdr_one(struct tcrypt_alg *alg, const char *mode,
+ const char *key,struct tcrypt_phdr *hdr)
+{
+ char backend_key[TCRYPT_HDR_KEY_LEN];
char iv[TCRYPT_HDR_IV_LEN] = {};
- char mode_name[MAX_CIPHER_LEN];
+ char mode_name[MAX_CIPHER_LEN + 1];
struct crypt_cipher *cipher;
- void *buf = &hdr->e;
- char *c;
+ char *c, *buf = (char*)&hdr->e;
int r;
/* Remove IV if present */
+ mode_name[MAX_CIPHER_LEN] = '\0';
strncpy(mode_name, mode, MAX_CIPHER_LEN);
c = strchr(mode_name, '-');
if (c)
*c = '\0';
if (!strncmp(mode, "lrw", 3))
- iv[15] = 1;
-
- r = crypt_cipher_init(&cipher, name, mode_name, key, key_size);
- if (r < 0)
- return r;
+ iv[alg->iv_size - 1] = 1;
+ else if (!strncmp(mode, "cbc", 3)) {
+ TCRYPT_remove_whitening(buf, &key[8]);
+ if (!strcmp(alg->name, "blowfish_le"))
+ return decrypt_blowfish_le_cbc(alg, key, buf);
+ memcpy(iv, &key[alg->iv_offset], alg->iv_size);
+ }
- r = crypt_cipher_decrypt(cipher, buf, buf, TCRYPT_HDR_LEN,
- iv, TCRYPT_HDR_IV_LEN);
- crypt_cipher_destroy(cipher);
+ TCRYPT_copy_key(alg, mode, backend_key, key);
+ r = crypt_cipher_init(&cipher, alg->name, mode_name,
+ backend_key, alg->key_size);
+ if (!r) {
+ r = crypt_cipher_decrypt(cipher, buf, buf, TCRYPT_HDR_LEN,
+ iv, alg->iv_size);
+ crypt_cipher_destroy(cipher);
+ }
+ crypt_safe_memzero(backend_key, sizeof(backend_key));
+ crypt_safe_memzero(iv, TCRYPT_HDR_IV_LEN);
return r;
}
-static void copy_key(char *out_key, const char *key, int key_num,
- int ks, int ki, const char *mode)
+/*
+ * For chained ciphers and CBC mode we need "outer" decryption.
+ * Backend doesn't provide this, so implement it here directly using ECB.
+ */
+static int TCRYPT_decrypt_cbci(struct tcrypt_algs *ciphers,
+ const char *key, struct tcrypt_phdr *hdr)
{
- if (!strncmp(mode, "xts", 3)) {
- int ks2 = ks / 2;
- memcpy(out_key, &key[ks2 * ki], ks2);
- memcpy(&out_key[ks2], &key[ks2 * (++key_num + ki)], ks2);
- } else if (!strncmp(mode, "lrw", 3)) {
- /* First is LRW index key */
- ki++;
- ks -= TCRYPT_LRW_IKEY_LEN;
- memcpy(out_key, &key[ks * ki], ks);
- memcpy(&out_key[ks * ki], key, TCRYPT_LRW_IKEY_LEN);
+ struct crypt_cipher *cipher[3];
+ unsigned int bs = ciphers->cipher[0].iv_size;
+ char *buf = (char*)&hdr->e, iv[16], iv_old[16];
+ unsigned int i, j;
+ int r = -EINVAL;
+
+ assert(ciphers->chain_count <= 3);
+ assert(bs <= 16);
+
+ TCRYPT_remove_whitening(buf, &key[8]);
+
+ memcpy(iv, &key[ciphers->cipher[0].iv_offset], bs);
+
+ /* Initialize all ciphers in chain in ECB mode */
+ for (j = 0; j < ciphers->chain_count; j++)
+ cipher[j] = NULL;
+ for (j = 0; j < ciphers->chain_count; j++) {
+ r = crypt_cipher_init(&cipher[j], ciphers->cipher[j].name, "ecb",
+ &key[ciphers->cipher[j].key_offset],
+ ciphers->cipher[j].key_size);
+ if (r < 0)
+ goto out;
}
-}
-
-static int top_cipher(const char *cipher[3])
-{
- if (cipher[2])
- return 2;
- if (cipher[1])
- return 1;
+ /* Implements CBC with chained ciphers in loop inside */
+ for (i = 0; i < TCRYPT_HDR_LEN; i += bs) {
+ memcpy(iv_old, &buf[i], bs);
+ for (j = ciphers->chain_count; j > 0; j--) {
+ r = crypt_cipher_decrypt(cipher[j - 1], &buf[i], &buf[i],
+ bs, NULL, 0);
+ if (r < 0)
+ goto out;
+ }
+ for (j = 0; j < bs; j++)
+ buf[i + j] ^= iv[j];
+ memcpy(iv, iv_old, bs);
+ }
+out:
+ for (j = 0; j < ciphers->chain_count; j++)
+ if (cipher[j])
+ crypt_cipher_destroy(cipher[j]);
- return 0;
+ crypt_safe_memzero(iv, bs);
+ crypt_safe_memzero(iv_old, bs);
+ return r;
}
-static int decrypt_hdr(struct crypt_device *cd, struct tcrypt_phdr *hdr,
- const char *key)
+static int TCRYPT_decrypt_hdr(struct crypt_device *cd, struct tcrypt_phdr *hdr,
+ const char *key, struct crypt_params_tcrypt *params)
{
- char one_key[TCRYPT_HDR_KEY_LEN];
struct tcrypt_phdr hdr2;
- int i, j, r;
+ int i, j, r = -EINVAL;
- for (i = 0; tcrypt_cipher[i].cipher[0]; i++) {
- log_dbg("TCRYPT: trying cipher: %s%s%s%s%s-%s.",
- tcrypt_cipher[i].cipher[0],
- tcrypt_cipher[i].cipher[1] ? "-" : "", tcrypt_cipher[i].cipher[1] ?: "",
- tcrypt_cipher[i].cipher[2] ? "-" : "", tcrypt_cipher[i].cipher[2] ?: "",
- tcrypt_cipher[i].mode);
+ for (i = 0; tcrypt_cipher[i].chain_count; i++) {
+ if (params->cipher && !strstr(tcrypt_cipher[i].long_name, params->cipher))
+ continue;
+ if (!(params->flags & CRYPT_TCRYPT_LEGACY_MODES) && tcrypt_cipher[i].legacy)
+ continue;
+ log_dbg(cd, "TCRYPT: trying cipher %s-%s",
+ tcrypt_cipher[i].long_name, tcrypt_cipher[i].mode);
memcpy(&hdr2.e, &hdr->e, TCRYPT_HDR_LEN);
- for (j = 2; j >= 0 ; j--) {
- if (!tcrypt_cipher[i].cipher[j])
+ if (!strncmp(tcrypt_cipher[i].mode, "cbci", 4))
+ r = TCRYPT_decrypt_cbci(&tcrypt_cipher[i], key, &hdr2);
+ else for (j = tcrypt_cipher[i].chain_count - 1; j >= 0 ; j--) {
+ if (!tcrypt_cipher[i].cipher[j].name)
continue;
- copy_key(one_key, key, top_cipher(tcrypt_cipher[i].cipher),
- tcrypt_cipher[i].key_size,
- j, tcrypt_cipher[i].mode);
- r = decrypt_hdr_one(tcrypt_cipher[i].cipher[j],
- tcrypt_cipher[i].mode, one_key,
- tcrypt_cipher[i].key_size, &hdr2);
+ r = TCRYPT_decrypt_hdr_one(&tcrypt_cipher[i].cipher[j],
+ tcrypt_cipher[i].mode, key, &hdr2);
if (r < 0)
break;
}
+ if (r < 0) {
+ log_dbg(cd, "TCRYPT: returned error %d, skipped.", r);
+ if (r == -ENOTSUP)
+ break;
+ r = -ENOENT;
+ continue;
+ }
+
if (!strncmp(hdr2.d.magic, TCRYPT_HDR_MAGIC, TCRYPT_HDR_MAGIC_LEN)) {
- log_dbg("TCRYPT: Signature magic detected.");
+ log_dbg(cd, "TCRYPT: Signature magic detected.");
+ memcpy(&hdr->e, &hdr2.e, TCRYPT_HDR_LEN);
+ r = i;
+ break;
+ }
+ if ((params->flags & CRYPT_TCRYPT_VERA_MODES) &&
+ !strncmp(hdr2.d.magic, VCRYPT_HDR_MAGIC, TCRYPT_HDR_MAGIC_LEN)) {
+ log_dbg(cd, "TCRYPT: Signature magic detected (Veracrypt).");
memcpy(&hdr->e, &hdr2.e, TCRYPT_HDR_LEN);
- memset(&hdr2.e, 0, TCRYPT_HDR_LEN);
r = i;
break;
}
r = -EPERM;
}
- memset(one_key, 0, sizeof(*one_key));
+ crypt_safe_memzero(&hdr2, sizeof(hdr2));
return r;
}
-static int pool_keyfile(struct crypt_device *cd,
- unsigned char pool[TCRYPT_KEY_POOL_LEN],
- const char *keyfile)
+static int TCRYPT_pool_keyfile(struct crypt_device *cd,
+ unsigned char pool[VCRYPT_KEY_POOL_LEN],
+ const char *keyfile, int keyfiles_pool_length)
{
- unsigned char data[TCRYPT_KEYFILE_LEN];
- int i, j, fd, data_size;
+ unsigned char *data;
+ int i, j, fd, data_size, r = -EIO;
uint32_t crc;
- unsigned char *crc_c = (unsigned char*)&crc;
- log_dbg("TCRYPT: using keyfile %s.", keyfile);
+ log_dbg(cd, "TCRYPT: using keyfile %s.", keyfile);
+
+ data = malloc(TCRYPT_KEYFILE_LEN);
+ if (!data)
+ return -ENOMEM;
+ memset(data, 0, TCRYPT_KEYFILE_LEN);
fd = open(keyfile, O_RDONLY);
if (fd < 0) {
- log_err(cd, _("Failed to open key file.\n"));
- return -EIO;
+ log_err(cd, _("Failed to open key file."));
+ goto out;
}
- /* FIXME: add while */
- data_size = read(fd, data, TCRYPT_KEYFILE_LEN);
+ data_size = read_buffer(fd, data, TCRYPT_KEYFILE_LEN);
close(fd);
if (data_size < 0) {
- log_err(cd, _("Error reading keyfile %s.\n"), keyfile);
- return -EIO;
+ log_err(cd, _("Error reading keyfile %s."), keyfile);
+ goto out;
}
for (i = 0, j = 0, crc = ~0U; i < data_size; i++) {
crc = crypt_crc32(crc, &data[i], 1);
- pool[j++] += crc_c[3];
- pool[j++] += crc_c[2];
- pool[j++] += crc_c[1];
- pool[j++] += crc_c[0];
- j %= TCRYPT_KEY_POOL_LEN;
+ pool[j++] += (unsigned char)(crc >> 24);
+ pool[j++] += (unsigned char)(crc >> 16);
+ pool[j++] += (unsigned char)(crc >> 8);
+ pool[j++] += (unsigned char)(crc);
+ j %= keyfiles_pool_length;
}
+ r = 0;
+out:
+ crypt_safe_memzero(&crc, sizeof(crc));
+ crypt_safe_memzero(data, TCRYPT_KEYFILE_LEN);
+ free(data);
- crc = 0;
- memset(data, 0, TCRYPT_KEYFILE_LEN);
-
- return 0;
+ return r;
}
static int TCRYPT_init_hdr(struct crypt_device *cd,
struct tcrypt_phdr *hdr,
struct crypt_params_tcrypt *params)
{
- unsigned char pwd[TCRYPT_KEY_POOL_LEN] = {};
- size_t passphrase_size;
+ unsigned char pwd[VCRYPT_KEY_POOL_LEN] = {};
+ size_t passphrase_size, max_passphrase_size;
char *key;
- int r, i;
+ unsigned int i, skipped = 0, iterations;
+ int r = -EPERM, keyfiles_pool_length;
if (posix_memalign((void*)&key, crypt_getpagesize(), TCRYPT_HDR_KEY_LEN))
return -ENOMEM;
+ if (params->flags & CRYPT_TCRYPT_VERA_MODES &&
+ params->passphrase_size > TCRYPT_KEY_POOL_LEN) {
+ /* Really. Keyfile pool length depends on passphrase size in Veracrypt. */
+ max_passphrase_size = VCRYPT_KEY_POOL_LEN;
+ keyfiles_pool_length = VCRYPT_KEY_POOL_LEN;
+ } else {
+ max_passphrase_size = TCRYPT_KEY_POOL_LEN;
+ keyfiles_pool_length = TCRYPT_KEY_POOL_LEN;
+ }
+
if (params->keyfiles_count)
- passphrase_size = TCRYPT_KEY_POOL_LEN;
+ passphrase_size = max_passphrase_size;
else
passphrase_size = params->passphrase_size;
+ if (params->passphrase_size > max_passphrase_size) {
+ log_err(cd, _("Maximum TCRYPT passphrase length (%zu) exceeded."),
+ max_passphrase_size);
+ goto out;
+ }
+
/* Calculate pool content from keyfiles */
for (i = 0; i < params->keyfiles_count; i++) {
- r = pool_keyfile(cd, pwd, params->keyfiles[i]);
+ r = TCRYPT_pool_keyfile(cd, pwd, params->keyfiles[i], keyfiles_pool_length);
if (r < 0)
goto out;
}
pwd[i] += params->passphrase[i];
for (i = 0; tcrypt_kdf[i].name; i++) {
+ if (params->hash_name && strcmp(params->hash_name, tcrypt_kdf[i].hash))
+ continue;
+ if (!(params->flags & CRYPT_TCRYPT_LEGACY_MODES) && tcrypt_kdf[i].legacy)
+ continue;
+ if (!(params->flags & CRYPT_TCRYPT_VERA_MODES) && tcrypt_kdf[i].veracrypt)
+ continue;
+ if ((params->flags & CRYPT_TCRYPT_VERA_MODES) && params->veracrypt_pim) {
+ /* Do not try TrueCrypt modes if we have PIM value */
+ if (!tcrypt_kdf[i].veracrypt)
+ continue;
+ /* adjust iterations to given PIM cmdline parameter */
+ iterations = tcrypt_kdf[i].veracrypt_pim_const +
+ (tcrypt_kdf[i].veracrypt_pim_mult * params->veracrypt_pim);
+ } else
+ iterations = tcrypt_kdf[i].iterations;
/* Derive header key */
- log_dbg("TCRYPT: trying KDF: %s-%s-%d.",
- tcrypt_kdf[i].name, tcrypt_kdf[i].hash, tcrypt_kdf[i].iterations);
+ log_dbg(cd, "TCRYPT: trying KDF: %s-%s-%d%s.",
+ tcrypt_kdf[i].name, tcrypt_kdf[i].hash, tcrypt_kdf[i].iterations,
+ params->veracrypt_pim && tcrypt_kdf[i].veracrypt ? "-PIM" : "");
r = crypt_pbkdf(tcrypt_kdf[i].name, tcrypt_kdf[i].hash,
(char*)pwd, passphrase_size,
hdr->salt, TCRYPT_HDR_SALT_LEN,
key, TCRYPT_HDR_KEY_LEN,
- tcrypt_kdf[i].iterations);
- if (r < 0)
- break;
+ iterations, 0, 0);
+ if (r < 0) {
+ log_verbose(cd, _("PBKDF2 hash algorithm %s not available, skipping."),
+ tcrypt_kdf[i].hash);
+ skipped++;
+ r = -EPERM;
+ continue;
+ }
/* Decrypt header */
- r = decrypt_hdr(cd, hdr, key);
+ r = TCRYPT_decrypt_hdr(cd, hdr, key, params);
+ if (r == -ENOENT) {
+ skipped++;
+ r = -EPERM;
+ continue;
+ }
if (r != -EPERM)
break;
}
+ if ((r < 0 && skipped && skipped == i) || r == -ENOTSUP) {
+ log_err(cd, _("Required kernel crypto interface not available."));
+#ifdef ENABLE_AF_ALG
+ log_err(cd, _("Ensure you have algif_skcipher kernel module loaded."));
+#endif
+ r = -ENOTSUP;
+ }
if (r < 0)
goto out;
- r = hdr_from_disk(hdr, params, i, r);
- if (r < 0)
- goto out;
-
- hdr_info(cd, hdr, params);
+ r = TCRYPT_hdr_from_disk(cd, hdr, params, i, r);
+ if (!r) {
+ log_dbg(cd, "TCRYPT: Magic: %s, Header version: %d, req. %d, sector %d"
+ ", mk_offset %" PRIu64 ", hidden_size %" PRIu64
+ ", volume size %" PRIu64, tcrypt_kdf[i].veracrypt ?
+ VCRYPT_HDR_MAGIC : TCRYPT_HDR_MAGIC,
+ (int)hdr->d.version, (int)hdr->d.version_tc, (int)hdr->d.sector_size,
+ hdr->d.mk_offset, hdr->d.hidden_volume_size, hdr->d.volume_size);
+ log_dbg(cd, "TCRYPT: Header cipher %s-%s, key size %zu",
+ params->cipher, params->mode, params->key_size);
+ }
out:
- memset(pwd, 0, TCRYPT_KEY_POOL_LEN);
+ crypt_safe_memzero(pwd, TCRYPT_KEY_POOL_LEN);
if (key)
- memset(key, 0, TCRYPT_HDR_KEY_LEN);
+ crypt_safe_memzero(key, TCRYPT_HDR_KEY_LEN);
free(key);
return r;
}
struct tcrypt_phdr *hdr,
struct crypt_params_tcrypt *params)
{
- struct device *device = crypt_metadata_device(cd);
+ struct device *base_device = NULL, *device = crypt_metadata_device(cd);
ssize_t hdr_size = sizeof(struct tcrypt_phdr);
- int devfd = 0, r;
+ char *base_device_path;
+ int devfd, r;
assert(sizeof(struct tcrypt_phdr) == 512);
- log_dbg("Reading TCRYPT header of size %d bytes from device %s.",
+ log_dbg(cd, "Reading TCRYPT header of size %zu bytes from device %s.",
hdr_size, device_path(device));
- devfd = open(device_path(device), O_RDONLY | O_DIRECT);
- if (devfd == -1) {
- log_err(cd, _("Cannot open device %s.\n"), device_path(device));
- return -EINVAL;
- }
+ if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER &&
+ crypt_dev_is_partition(device_path(device))) {
+ base_device_path = crypt_get_base_device(device_path(device));
+
+ log_dbg(cd, "Reading TCRYPT system header from device %s.", base_device_path ?: "?");
+ if (!base_device_path)
+ return -EINVAL;
- if ((params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) &&
- lseek(devfd, TCRYPT_HDR_HIDDEN_OFFSET, SEEK_SET) < 0) {
- log_err(cd, _("Cannot seek to hidden header for %s.\n"), device_path(device));
- close(devfd);
- return -EIO;
+ r = device_alloc(cd, &base_device, base_device_path);
+ free(base_device_path);
+ if (r < 0)
+ return r;
+ devfd = device_open(cd, base_device, O_RDONLY);
+ } else
+ devfd = device_open(cd, device, O_RDONLY);
+
+ if (devfd < 0) {
+ device_free(cd, base_device);
+ log_err(cd, _("Cannot open device %s."), device_path(device));
+ return -EINVAL;
}
- if (read_blockwise(devfd, device_block_size(device), hdr, hdr_size) == hdr_size)
+ r = -EIO;
+ if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) {
+ if (read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size,
+ TCRYPT_HDR_SYSTEM_OFFSET) == hdr_size) {
+ r = TCRYPT_init_hdr(cd, hdr, params);
+ }
+ } else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
+ if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
+ if (read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size,
+ TCRYPT_HDR_HIDDEN_OFFSET_BCK) == hdr_size)
+ r = TCRYPT_init_hdr(cd, hdr, params);
+ } else {
+ if (read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size,
+ TCRYPT_HDR_HIDDEN_OFFSET) == hdr_size)
+ r = TCRYPT_init_hdr(cd, hdr, params);
+ if (r && read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size,
+ TCRYPT_HDR_HIDDEN_OFFSET_OLD) == hdr_size)
+ r = TCRYPT_init_hdr(cd, hdr, params);
+ }
+ } else if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
+ if (read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size,
+ TCRYPT_HDR_OFFSET_BCK) == hdr_size)
+ r = TCRYPT_init_hdr(cd, hdr, params);
+ } else if (read_lseek_blockwise(devfd, device_block_size(cd, device),
+ device_alignment(device), hdr, hdr_size, 0) == hdr_size)
r = TCRYPT_init_hdr(cd, hdr, params);
- else
- r = -EIO;
- close(devfd);
+ device_free(cd, base_device);
+ if (r < 0)
+ memset(hdr, 0, sizeof (*hdr));
return r;
}
+static struct tcrypt_algs *TCRYPT_get_algs(const char *cipher, const char *mode)
+{
+ int i;
+
+ if (!cipher || !mode)
+ return NULL;
+
+ for (i = 0; tcrypt_cipher[i].chain_count; i++)
+ if (!strcmp(tcrypt_cipher[i].long_name, cipher) &&
+ !strcmp(tcrypt_cipher[i].mode, mode))
+ return &tcrypt_cipher[i];
+
+ return NULL;
+}
+
int TCRYPT_activate(struct crypt_device *cd,
const char *name,
struct tcrypt_phdr *hdr,
struct crypt_params_tcrypt *params,
uint32_t flags)
{
- char cipher[MAX_CIPHER_LEN], dm_name[PATH_MAX], dm_dev_name[PATH_MAX];
- struct device *device = NULL;
- int i, r;
+ char dm_name[PATH_MAX], dm_dev_name[PATH_MAX], cipher_spec[MAX_CIPHER_LEN*2+1];
+ char *part_path;
+ unsigned int i;
+ int r;
+ uint32_t req_flags, dmc_flags;
+ struct tcrypt_algs *algs;
+ enum devcheck device_check;
+ uint64_t offset = crypt_get_data_offset(cd);
+ struct volume_key *vk = NULL;
+ struct device *ptr_dev = crypt_data_device(cd), *device = NULL, *part_device = NULL;
struct crypt_dm_active_device dmd = {
- .target = DM_CRYPT,
- .size = 0,
- .data_device = crypt_data_device(cd),
- .u.crypt = {
- .cipher = cipher,
- .offset = crypt_get_data_offset(cd),
- .iv_offset = crypt_get_iv_offset(cd),
- }
+ .flags = flags
};
- r = device_block_adjust(cd, dmd.data_device, DEV_EXCL,
- dmd.u.crypt.offset, &dmd.size, &dmd.flags);
- if (r)
- return r;
+ if (!hdr->d.version) {
+ log_dbg(cd, "TCRYPT: this function is not supported without encrypted header load.");
+ return -ENOTSUP;
+ }
- dmd.u.crypt.vk = crypt_alloc_volume_key(params->key_size, NULL);
- if (!dmd.u.crypt.vk)
- return -ENOMEM;
+ if (hdr->d.sector_size % SECTOR_SIZE) {
+ log_err(cd, _("Activation is not supported for %d sector size."),
+ hdr->d.sector_size);
+ return -ENOTSUP;
+ }
+
+ if (strstr(params->mode, "-tcrypt")) {
+ log_err(cd, _("Kernel does not support activation for this TCRYPT legacy mode."));
+ return -ENOTSUP;
+ }
- for (i = 2; i >= 0; i--) {
+ if (strstr(params->mode, "-tcw"))
+ req_flags = DM_TCW_SUPPORTED;
+ else
+ req_flags = DM_PLAIN64_SUPPORTED;
- if (!params->cipher[i])
- continue;
+ algs = TCRYPT_get_algs(params->cipher, params->mode);
+ if (!algs)
+ return -EINVAL;
- if (i == 0) {
- strncpy(dm_name, name, sizeof(dm_name));
+ if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER)
+ dmd.size = 0;
+ else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER)
+ dmd.size = hdr->d.hidden_volume_size / SECTOR_SIZE;
+ else
+ dmd.size = hdr->d.volume_size / SECTOR_SIZE;
+
+ if (dmd.flags & CRYPT_ACTIVATE_SHARED)
+ device_check = DEV_OK;
+ else
+ device_check = DEV_EXCL;
+
+ if ((params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) &&
+ !crypt_dev_is_partition(device_path(crypt_data_device(cd)))) {
+ part_path = crypt_get_partition_device(device_path(crypt_data_device(cd)),
+ crypt_get_data_offset(cd), dmd.size);
+ if (part_path) {
+ if (!device_alloc(cd, &part_device, part_path)) {
+ log_verbose(cd, _("Activating TCRYPT system encryption for partition %s."),
+ part_path);
+ ptr_dev = part_device;
+ offset = 0;
+ }
+ free(part_path);
+ } else
+ /*
+ * System encryption use the whole device mapping, there can
+ * be active partitions.
+ */
+ device_check = DEV_OK;
+ }
+
+ r = device_block_adjust(cd, ptr_dev, device_check,
+ offset, &dmd.size, &dmd.flags);
+ if (r)
+ goto out;
+
+ /* From here, key size for every cipher must be the same */
+ vk = crypt_alloc_volume_key(algs->cipher[0].key_size +
+ algs->cipher[0].key_extra_size, NULL);
+ if (!vk) {
+ r = -ENOMEM;
+ goto out;
+ }
+
+ for (i = algs->chain_count; i > 0; i--) {
+ if (i == 1) {
+ dm_name[sizeof(dm_name)-1] = '\0';
+ strncpy(dm_name, name, sizeof(dm_name)-1);
dmd.flags = flags;
} else {
- snprintf(dm_name, sizeof(dm_name), "%s_%d", name, i);
+ if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, i-1) < 0) {
+ r = -EINVAL;
+ break;
+ }
dmd.flags = flags | CRYPT_ACTIVATE_PRIVATE;
}
- snprintf(cipher, sizeof(cipher), "%s-%s",
- params->cipher[i], params->mode);
- copy_key(dmd.u.crypt.vk->key, hdr->d.keys,
- top_cipher(params->cipher),
- params->key_size, i, params->mode);
+ TCRYPT_copy_key(&algs->cipher[i-1], algs->mode,
+ vk->key, hdr->d.keys);
- if (top_cipher(params->cipher) != i) {
- snprintf(dm_dev_name, sizeof(dm_dev_name), "%s/%s_%d",
- dm_get_dir(), name, i + 1);
- r = device_alloc(&device, dm_dev_name);
+ if (algs->chain_count != i) {
+ if (snprintf(dm_dev_name, sizeof(dm_dev_name), "%s/%s_%d", dm_get_dir(), name, i) < 0) {
+ r = -EINVAL;
+ break;
+ }
+ r = device_alloc(cd, &device, dm_dev_name);
if (r)
break;
- dmd.data_device = device;
- dmd.u.crypt.offset = 0;
+ ptr_dev = device;
+ offset = 0;
+ }
+
+ r = snprintf(cipher_spec, sizeof(cipher_spec), "%s-%s", algs->cipher[i-1].name, algs->mode);
+ if (r < 0 || (size_t)r >= sizeof(cipher_spec)) {
+ r = -ENOMEM;
+ break;
}
- log_dbg("Trying to activate TCRYPT device %s using cipher %s.",
- dm_name, dmd.u.crypt.cipher);
- r = dm_create_device(cd, dm_name, CRYPT_TCRYPT, &dmd, 0);
+ r = dm_crypt_target_set(&dmd.segment, 0, dmd.size, ptr_dev, vk,
+ cipher_spec, crypt_get_iv_offset(cd), offset,
+ crypt_get_integrity(cd),
+ crypt_get_integrity_tag_size(cd),
+ crypt_get_sector_size(cd));
+ if (r)
+ break;
+
+ log_dbg(cd, "Trying to activate TCRYPT device %s using cipher %s.",
+ dm_name, dmd.segment.u.crypt.cipher);
+ r = dm_create_device(cd, dm_name, CRYPT_TCRYPT, &dmd);
- device_free(device);
+ dm_targets_free(cd, &dmd);
+ device_free(cd, device);
device = NULL;
if (r)
break;
}
- if (!r && !(dm_flags() & DM_PLAIN64_SUPPORTED)) {
- log_err(cd, _("Kernel doesn't support plain64 IV.\n"));
+ if (r < 0 &&
+ (dm_flags(cd, DM_CRYPT, &dmc_flags) || ((dmc_flags & req_flags) != req_flags))) {
+ log_err(cd, _("Kernel does not support TCRYPT compatible mapping."));
r = -ENOTSUP;
}
- crypt_free_volume_key(dmd.u.crypt.vk);
+out:
+ crypt_free_volume_key(vk);
+ device_free(cd, device);
+ device_free(cd, part_device);
return r;
}
+
+static int TCRYPT_remove_one(struct crypt_device *cd, const char *name,
+ const char *base_uuid, int index, uint32_t flags)
+{
+ struct crypt_dm_active_device dmd;
+ char dm_name[PATH_MAX];
+ int r;
+
+ if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, index) < 0)
+ return -ENOMEM;
+
+ r = dm_status_device(cd, dm_name);
+ if (r < 0)
+ return r;
+
+ r = dm_query_device(cd, dm_name, DM_ACTIVE_UUID, &dmd);
+ if (!r && !strncmp(dmd.uuid, base_uuid, strlen(base_uuid)))
+ r = dm_remove_device(cd, dm_name, flags);
+
+ free(CONST_CAST(void*)dmd.uuid);
+ return r;
+}
+
+int TCRYPT_deactivate(struct crypt_device *cd, const char *name, uint32_t flags)
+{
+ struct crypt_dm_active_device dmd;
+ int r;
+
+ r = dm_query_device(cd, name, DM_ACTIVE_UUID, &dmd);
+ if (r < 0)
+ return r;
+ if (!dmd.uuid)
+ return -EINVAL;
+
+ r = dm_remove_device(cd, name, flags);
+ if (r < 0)
+ goto out;
+
+ r = TCRYPT_remove_one(cd, name, dmd.uuid, 1, flags);
+ if (r < 0)
+ goto out;
+
+ r = TCRYPT_remove_one(cd, name, dmd.uuid, 2, flags);
+out:
+ free(CONST_CAST(void*)dmd.uuid);
+ return (r == -ENODEV) ? 0 : r;
+}
+
+static int TCRYPT_status_one(struct crypt_device *cd, const char *name,
+ const char *base_uuid, int index,
+ size_t *key_size, char *cipher,
+ struct tcrypt_phdr *tcrypt_hdr,
+ struct device **device)
+{
+ struct crypt_dm_active_device dmd;
+ struct dm_target *tgt = &dmd.segment;
+ char dm_name[PATH_MAX], *c;
+ int r;
+
+ if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, index) < 0)
+ return -ENOMEM;
+
+ r = dm_status_device(cd, dm_name);
+ if (r < 0)
+ return r;
+
+ r = dm_query_device(cd, dm_name, DM_ACTIVE_DEVICE |
+ DM_ACTIVE_UUID |
+ DM_ACTIVE_CRYPT_CIPHER |
+ DM_ACTIVE_CRYPT_KEYSIZE, &dmd);
+ if (r < 0)
+ return r;
+ if (!single_segment(&dmd) || tgt->type != DM_CRYPT) {
+ r = -ENOTSUP;
+ goto out;
+ }
+
+ r = 0;
+
+ if (!strncmp(dmd.uuid, base_uuid, strlen(base_uuid))) {
+ if ((c = strchr(tgt->u.crypt.cipher, '-')))
+ *c = '\0';
+ strcat(cipher, "-");
+ strncat(cipher, tgt->u.crypt.cipher, MAX_CIPHER_LEN);
+ *key_size += tgt->u.crypt.vk->keylength;
+ tcrypt_hdr->d.mk_offset = tgt->u.crypt.offset * SECTOR_SIZE;
+ device_free(cd, *device);
+ MOVE_REF(*device, tgt->data_device);
+ } else
+ r = -ENODEV;
+out:
+ dm_targets_free(cd, &dmd);
+ free(CONST_CAST(void*)dmd.uuid);
+ return r;
+}
+
+int TCRYPT_init_by_name(struct crypt_device *cd, const char *name,
+ const char *uuid,
+ const struct dm_target *tgt,
+ struct device **device,
+ struct crypt_params_tcrypt *tcrypt_params,
+ struct tcrypt_phdr *tcrypt_hdr)
+{
+ struct tcrypt_algs *algs;
+ char cipher[MAX_CIPHER_LEN * 4], mode[MAX_CIPHER_LEN+1], *tmp;
+ size_t key_size;
+ int r;
+
+ memset(tcrypt_params, 0, sizeof(*tcrypt_params));
+ memset(tcrypt_hdr, 0, sizeof(*tcrypt_hdr));
+ tcrypt_hdr->d.sector_size = SECTOR_SIZE;
+ tcrypt_hdr->d.mk_offset = tgt->u.crypt.offset * SECTOR_SIZE;
+
+ strncpy(cipher, tgt->u.crypt.cipher, MAX_CIPHER_LEN);
+ tmp = strchr(cipher, '-');
+ if (!tmp)
+ return -EINVAL;
+ *tmp = '\0';
+ mode[MAX_CIPHER_LEN] = '\0';
+ strncpy(mode, ++tmp, MAX_CIPHER_LEN);
+
+ key_size = tgt->u.crypt.vk->keylength;
+ r = TCRYPT_status_one(cd, name, uuid, 1, &key_size,
+ cipher, tcrypt_hdr, device);
+ if (!r)
+ r = TCRYPT_status_one(cd, name, uuid, 2, &key_size,
+ cipher, tcrypt_hdr, device);
+
+ if (r < 0 && r != -ENODEV)
+ return r;
+
+ algs = TCRYPT_get_algs(cipher, mode);
+ if (!algs || key_size != algs->chain_key_size)
+ return -EINVAL;
+
+ tcrypt_params->key_size = algs->chain_key_size;
+ tcrypt_params->cipher = algs->long_name;
+ tcrypt_params->mode = algs->mode;
+ return 0;
+}
+
+uint64_t TCRYPT_get_data_offset(struct crypt_device *cd,
+ struct tcrypt_phdr *hdr,
+ struct crypt_params_tcrypt *params)
+{
+ uint64_t size;
+
+ if (!hdr->d.version) {
+ /* No real header loaded, initialized by active device, use default mk_offset */
+ } else if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) {
+ /* Mapping through whole device, not partition! */
+ if (crypt_dev_is_partition(device_path(crypt_data_device(cd))))
+ return 0;
+ } else if (params->mode && !strncmp(params->mode, "xts", 3)) {
+ if (hdr->d.version < 3)
+ return 1;
+
+ if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
+ if (hdr->d.version > 3)
+ return (hdr->d.mk_offset / SECTOR_SIZE);
+ if (device_size(crypt_metadata_device(cd), &size) < 0)
+ return 0;
+ return (size - hdr->d.hidden_volume_size +
+ (TCRYPT_HDR_HIDDEN_OFFSET_OLD)) / SECTOR_SIZE;
+ }
+ } else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
+ if (device_size(crypt_metadata_device(cd), &size) < 0)
+ return 0;
+ return (size - hdr->d.hidden_volume_size +
+ (TCRYPT_HDR_HIDDEN_OFFSET_OLD)) / SECTOR_SIZE;
+ }
+
+ return hdr->d.mk_offset / SECTOR_SIZE;
+}
+
+uint64_t TCRYPT_get_iv_offset(struct crypt_device *cd,
+ struct tcrypt_phdr *hdr,
+ struct crypt_params_tcrypt *params)
+{
+ uint64_t iv_offset;
+
+ if (params->mode && !strncmp(params->mode, "xts", 3))
+ iv_offset = TCRYPT_get_data_offset(cd, hdr, params);
+ else if (params->mode && !strncmp(params->mode, "lrw", 3))
+ iv_offset = 0;
+ else
+ iv_offset = hdr->d.mk_offset / SECTOR_SIZE;
+
+ if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER)
+ iv_offset += crypt_dev_partition_offset(device_path(crypt_data_device(cd)));
+
+ return iv_offset;
+}
+
+int TCRYPT_get_volume_key(struct crypt_device *cd,
+ struct tcrypt_phdr *hdr,
+ struct crypt_params_tcrypt *params,
+ struct volume_key **vk)
+{
+ struct tcrypt_algs *algs;
+ unsigned int i, key_index;
+
+ if (!hdr->d.version) {
+ log_err(cd, _("This function is not supported without TCRYPT header load."));
+ return -ENOTSUP;
+ }
+
+ algs = TCRYPT_get_algs(params->cipher, params->mode);
+ if (!algs)
+ return -EINVAL;
+
+ *vk = crypt_alloc_volume_key(params->key_size, NULL);
+ if (!*vk)
+ return -ENOMEM;
+
+ for (i = 0, key_index = 0; i < algs->chain_count; i++) {
+ TCRYPT_copy_key(&algs->cipher[i], algs->mode,
+ &(*vk)->key[key_index], hdr->d.keys);
+ key_index += algs->cipher[i].key_size;
+ }
+
+ return 0;
+}
+
+int TCRYPT_dump(struct crypt_device *cd,
+ struct tcrypt_phdr *hdr,
+ struct crypt_params_tcrypt *params)
+{
+ log_std(cd, "%s header information for %s\n",
+ hdr->d.magic[0] == 'T' ? "TCRYPT" : "VERACRYPT",
+ device_path(crypt_metadata_device(cd)));
+ if (hdr->d.version) {
+ log_std(cd, "Version: \t%d\n", hdr->d.version);
+ log_std(cd, "Driver req.:\t%x.%x\n", hdr->d.version_tc >> 8,
+ hdr->d.version_tc & 0xFF);
+
+ log_std(cd, "Sector size:\t%" PRIu32 "\n", hdr->d.sector_size);
+ log_std(cd, "MK offset:\t%" PRIu64 "\n", hdr->d.mk_offset);
+ log_std(cd, "PBKDF2 hash:\t%s\n", params->hash_name);
+ }
+ log_std(cd, "Cipher chain:\t%s\n", params->cipher);
+ log_std(cd, "Cipher mode:\t%s\n", params->mode);
+ log_std(cd, "MK bits: \t%zu\n", params->key_size * 8);
+ return 0;
+}
projects / platform / upstream / cryptsetup.git / blobdiff