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tcplay.c
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tcplay.c
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/*
* Copyright (c) 2011 Alex Hornung <alex@alexhornung.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _BSD_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#if defined(__DragonFly__)
#include <sys/param.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <inttypes.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <err.h>
#include <time.h>
#if defined(__linux__)
#include <libdevmapper.h>
#include <uuid/uuid.h>
#include <sys/sysmacros.h>
#elif defined(__DragonFly__)
#include <libdm.h>
#include <uuid.h>
#endif
#include <dirent.h>
#include "crc32.h"
#include "tcplay.h"
#include "humanize.h"
/* XXX TODO:
* - LRW-benbi support? needs further work in dm-crypt and even opencrypto
* - secure buffer review (i.e: is everything that needs it using secure mem?)
* - mlockall? (at least MCL_FUTURE, which is the only one we support)
*/
summary_fn_t summary_fn = NULL;
int tc_internal_verbose = 1;
char tc_internal_log_buffer[LOG_BUFFER_SZ];
int tc_internal_state = STATE_UNKNOWN;
void
tc_log(int is_err, const char *fmt, ...)
{
va_list ap;
FILE *fp;
if (is_err)
fp = stderr;
else
fp = stdout;
va_start(ap, fmt);
vsnprintf(tc_internal_log_buffer, LOG_BUFFER_SZ, fmt, ap);
va_end(ap);
if (tc_internal_verbose)
fprintf(fp, "%s", tc_internal_log_buffer);
}
/* Supported algorithms */
struct pbkdf_prf_algo pbkdf_prf_algos[] = {
{ "RIPEMD160", "RIPEMD160", 2000, TC_SIG, 0},
{ "RIPEMD160", "RIPEMD160", 1000, TC_SIG, 1},
{ "SHA512", "SHA512", 1000, TC_SIG, 0},
{ "whirlpool", "whirlpool", 1000, TC_SIG, 0},
{ "RIPEMD160-VC", "RIPEMD160", 655331, VC_SIG, 0},
{ "RIPEMD160-VC", "RIPEMD160", 327661, VC_SIG, 1},
{ "SHA512-VC", "SHA512", 500000, VC_SIG, 0},
{ "whirlpool-VC", "whirlpool", 500000, VC_SIG, 0},
{ "SHA256-VC", "SHA256", 500000, VC_SIG, 0},
{ "SHA256-VC", "SHA256", 200000, VC_SIG, 1},
{ NULL, NULL, 0, NULL, 0}
};
struct tc_crypto_algo tc_crypto_algos[] = {
#if 0
/* XXX: turns out TC doesn't support AES-128-XTS */
{ "AES-128-XTS", "aes-xts-plain", 32, 8 },
{ "TWOFISH-128-XTS", "twofish-xts-plain", 32, 8 },
{ "SERPENT-128-XTS", "serpent-xts-plain", 32, 8 },
#endif
{ "AES-256-XTS", "aes-xts-plain64", 64, 8 },
{ "TWOFISH-256-XTS", "twofish-xts-plain64", 64, 8 },
{ "SERPENT-256-XTS", "serpent-xts-plain64", 64, 8 },
{ NULL, NULL, 0, 0 }
};
const char *valid_cipher_chains[][MAX_CIPHER_CHAINS] = {
{ "AES-256-XTS", NULL },
{ "TWOFISH-256-XTS", NULL },
{ "SERPENT-256-XTS", NULL },
{ "AES-256-XTS", "TWOFISH-256-XTS", "SERPENT-256-XTS", NULL },
{ "SERPENT-256-XTS", "TWOFISH-256-XTS", "AES-256-XTS", NULL },
#if 0
/* It seems that all the two-way cascades are the other way round... */
{ "AES-256-XTS", "TWOFISH-256-XTS", NULL },
{ "SERPENT-256-XTS", "AES-256-XTS", NULL },
{ "TWOFISH-256-XTS", "SERPENT-256-XTS", NULL },
#endif
{ "TWOFISH-256-XTS", "AES-256-XTS", NULL },
{ "AES-256-XTS", "SERPENT-256-XTS", NULL },
{ "SERPENT-256-XTS", "TWOFISH-256-XTS", NULL },
{ NULL }
};
struct tc_cipher_chain *tc_cipher_chains[MAX_CIPHER_CHAINS];
static
int
tc_build_cipher_chains(void)
{
struct tc_cipher_chain *chain, *elem, *prev;
int i = 0;
int k;
while (valid_cipher_chains[i][0] != NULL) {
chain = NULL;
prev = NULL;
k = 0;
while (valid_cipher_chains[i][k] != NULL) {
if ((elem = alloc_safe_mem(sizeof(*elem))) == NULL) {
tc_log(1, "Error allocating memory for "
"cipher chain\n");
return -1;
}
/* Initialize first element of chain */
if (chain == NULL) {
chain = elem;
elem->prev = NULL;
}
/* Populate previous element */
if (prev != NULL) {
prev->next = elem;
elem->prev = prev;
}
/* Assume we are the last element in the chain */
elem->next = NULL;
/* Initialize other fields */
elem->cipher = check_cipher(valid_cipher_chains[i][k], 0);
if (elem->cipher == NULL)
return -1;
elem->key = NULL;
prev = elem;
++k;
}
/* Store cipher chain */
tc_cipher_chains[i++] = chain;
/* Integrity check */
if (i >= MAX_CIPHER_CHAINS) {
tc_log(1, "FATAL: tc_cipher_chains is full!!\n");
return -1;
}
/* Make sure array is NULL terminated */
tc_cipher_chains[i] = NULL;
}
return 0;
}
static
struct tc_cipher_chain *
tc_dup_cipher_chain(struct tc_cipher_chain *src)
{
struct tc_cipher_chain *first = NULL, *prev = NULL, *elem;
for (; src != NULL; src = src->next) {
if ((elem = alloc_safe_mem(sizeof(*elem))) == NULL) {
tc_log(1, "Error allocating memory for "
"duplicate cipher chain\n");
return NULL;
}
memcpy(elem, src, sizeof(*elem));
if (src->key != NULL) {
if ((elem->key = alloc_safe_mem(src->cipher->klen)) == NULL) {
tc_log(1, "Error allocating memory for "
"duplicate key in cipher chain\n");
return NULL;
}
memcpy(elem->key, src->key, src->cipher->klen);
}
if (first == NULL)
first = elem;
elem->next = NULL;
elem->prev = prev;
if (prev != NULL)
prev->next = elem;
prev = elem;
}
return first;
}
static
int
tc_free_cipher_chain(struct tc_cipher_chain *chain)
{
struct tc_cipher_chain *next = chain;
while ((chain = next) != NULL) {
next = chain->next;
if (chain->key != NULL)
free_safe_mem(chain->key);
free_safe_mem(chain);
}
return 0;
}
int
tc_cipher_chain_length(struct tc_cipher_chain *chain)
{
int len = 0;
for (; chain != NULL; chain = chain->next)
++len;
return len;
}
int
tc_cipher_chain_klen(struct tc_cipher_chain *chain)
{
int klen_bytes = 0;
for (; chain != NULL; chain = chain->next) {
klen_bytes += chain->cipher->klen;
}
return klen_bytes;
}
char *
tc_cipher_chain_sprint(char *buf, size_t bufsz, struct tc_cipher_chain *chain)
{
static char sbuf[256];
int n = 0;
if (buf == NULL) {
buf = sbuf;
bufsz = sizeof(sbuf);
}
for (; chain != NULL; chain = chain->next) {
n += snprintf(buf+n, bufsz-n, "%s%s", chain->cipher->name,
(chain->next != NULL) ? "," : "\0");
}
return buf;
}
#ifdef DEBUG
static void
print_hex(unsigned char *buf, off_t start, size_t len)
{
size_t i;
for (i = start; i < start+len; i++)
printf("%02x", buf[i]);
printf("\n");
}
#endif
void
print_info(struct tcplay_info *info)
{
printf("Device:\t\t\t%s\n", info->dev);
if (info->pbkdf_prf != NULL) {
printf("PBKDF2 PRF:\t\t%s\n", info->pbkdf_prf->name);
printf("PBKDF2 iterations:\t%d\n",
info->pbkdf_prf->iteration_count);
}
printf("Cipher:\t\t\t%s\n",
tc_cipher_chain_sprint(NULL, 0, info->cipher_chain));
printf("Key Length:\t\t%d bits\n",
8*tc_cipher_chain_klen(info->cipher_chain));
if (info->hdr != NULL) {
printf("CRC Key Data:\t\t%#x\n", info->hdr->crc_keys);
printf("Sector size:\t\t%d\n", info->hdr->sec_sz);
printf("Signature:\t\t%c%c%c%c\n", info->hdr->tc_str[0],
info->hdr->tc_str[1], info->hdr->tc_str[2],
info->hdr->tc_str[3]);
} else {
printf("Sector size:\t\t512\n");
}
printf("Volume size:\t\t%"DISKSZ_FMT" sectors\n", info->size);
#if 0
/* Don't print this; it's always 0 and is rather confusing */
printf("Volume offset:\t\t%"PRIu64"\n", (uint64_t)info->start);
#endif
#ifdef DEBUG
printf("Vol Flags:\t\t%d\n", info->volflags);
#endif
printf("IV offset:\t\t%"PRIu64" sectors\n",
(uint64_t)info->skip);
printf("Block offset:\t\t%"PRIu64" sectors\n",
(uint64_t)info->offset);
}
static
struct tcplay_info *
new_info(const char *dev, int flags, struct tc_cipher_chain *cipher_chain,
struct pbkdf_prf_algo *prf, struct tchdr_dec *hdr, off_t start)
{
struct tc_cipher_chain *chain_start;
struct tcplay_info *info;
int i;
int error;
chain_start = cipher_chain;
if ((info = (struct tcplay_info *)alloc_safe_mem(sizeof(*info))) == NULL) {
tc_log(1, "could not allocate safe info memory\n");
return NULL;
}
strncpy(info->dev, dev, sizeof(info->dev));
info->cipher_chain = cipher_chain;
info->pbkdf_prf = prf;
info->start = start;
info->hdr = hdr;
info->blk_sz = hdr->sec_sz;
info->size = hdr->sz_mk_scope / hdr->sec_sz; /* volume size */
info->skip = hdr->off_mk_scope / hdr->sec_sz; /* iv skip */
info->volflags = hdr->flags;
info->flags = flags;
if (TC_FLAG_SET(flags, SYS))
info->offset = 0; /* offset is 0 for system volumes */
else
info->offset = hdr->off_mk_scope / hdr->sec_sz; /* block offset */
/* Associate a key out of the key pool with each cipher in the chain */
error = tc_cipher_chain_populate_keys(cipher_chain, hdr->keys);
if (error) {
tc_log(1, "could not populate keys in cipher chain\n");
return NULL;
}
for (; cipher_chain != NULL; cipher_chain = cipher_chain->next) {
for (i = 0; i < cipher_chain->cipher->klen; i++)
sprintf(&cipher_chain->dm_key[i*2], "%02x",
cipher_chain->key[i]);
}
tc_cipher_chain_free_keys(chain_start);
return info;
}
int
free_info(struct tcplay_info *info)
{
if (info->cipher_chain)
tc_free_cipher_chain(info->cipher_chain);
if (info->hdr)
free_safe_mem(info->hdr);
free_safe_mem(info);
return 0;
}
int
adjust_info(struct tcplay_info *info, struct tcplay_info *hinfo)
{
if (hinfo->hdr->sz_hidvol == 0)
return 1;
info->size -= hinfo->hdr->sz_hidvol / hinfo->hdr->sec_sz;
return 0;
}
int
process_hdr(const char *dev, int flags, unsigned char *pass, int passlen,
struct tchdr_enc *ehdr, struct tcplay_info **pinfo)
{
struct tchdr_dec *dhdr;
struct tcplay_info *info;
struct tc_cipher_chain *cipher_chain = NULL;
unsigned char *key;
int i, j, found, error;
*pinfo = NULL;
if ((key = alloc_safe_mem(MAX_KEYSZ)) == NULL) {
tc_log(1, "could not allocate safe key memory\n");
return ENOMEM;
}
/* Start search for correct algorithm combination */
found = 0;
for (i = 0; !found && pbkdf_prf_algos[i].name != NULL; i++) {
#ifdef DEBUG
printf("\nTrying PRF algo %s (%d)\n", pbkdf_prf_algos[i].name,
pbkdf_prf_algos[i].iteration_count);
printf("Salt: ");
print_hex(ehdr->salt, 0, sizeof(ehdr->salt));
#endif
error = pbkdf2(&pbkdf_prf_algos[i], (char *)pass, passlen,
ehdr->salt, sizeof(ehdr->salt),
MAX_KEYSZ, key);
if (error) {
tc_log(1, "pbkdf failed for algorithm %s\n",
pbkdf_prf_algos[i].name);
free_safe_mem(key);
return EINVAL;
}
#if 0
printf("Derived Key: ");
print_hex(key, 0, MAX_KEYSZ);
#endif
for (j = 0; !found && tc_cipher_chains[j] != NULL; j++) {
cipher_chain = tc_dup_cipher_chain(tc_cipher_chains[j]);
#ifdef DEBUG
printf("\nTrying cipher chain %d\n", j);
#endif
dhdr = decrypt_hdr(ehdr, cipher_chain, key);
if (dhdr == NULL) {
tc_log(1, "hdr decryption failed for cipher "
"chain %d\n", j);
free_safe_mem(key);
return EINVAL;
}
if (verify_hdr(dhdr, &pbkdf_prf_algos[i])) {
#ifdef DEBUG
printf("tc_str: %.4s, tc_ver: %d, tc_min_ver: %d, "
"crc_keys: %d, sz_vol: %"PRIu64", "
"off_mk_scope: %"PRIu64", sz_mk_scope: %"PRIu64", "
"flags: %d, sec_sz: %d crc_dhdr: %d\n",
dhdr->tc_str, dhdr->tc_ver, dhdr->tc_min_ver,
dhdr->crc_keys, dhdr->sz_vol, dhdr->off_mk_scope,
dhdr->sz_mk_scope, dhdr->flags, dhdr->sec_sz,
dhdr->crc_dhdr);
#endif
found = 1;
} else {
free_safe_mem(dhdr);
tc_free_cipher_chain(cipher_chain);
}
}
}
free_safe_mem(key);
if (!found)
return EINVAL;
if ((info = new_info(dev, flags, cipher_chain,
&pbkdf_prf_algos[i-1], dhdr, 0)) == NULL) {
free_safe_mem(dhdr);
return ENOMEM;
}
*pinfo = info;
return 0;
}
int
create_volume(struct tcplay_opts *opts)
{
char *pass, *pass_again;
char *h_pass = NULL;
char buf[1024];
disksz_t blocks, hidden_blocks = 0;
size_t blksz;
struct tchdr_enc *ehdr, *hehdr;
struct tchdr_enc *ehdr_backup, *hehdr_backup;
uint64_t tmp;
int error, r, ret;
pass = h_pass = pass_again = NULL;
ehdr = hehdr = NULL;
ehdr_backup = hehdr_backup = NULL;
ret = -1; /* Default to returning error */
if (opts->cipher_chain == NULL)
opts->cipher_chain = tc_cipher_chains[0];
if (opts->prf_algo == NULL)
opts->prf_algo = &pbkdf_prf_algos[DEFAULT_PRF_ALGO_IDX];
if (opts->h_cipher_chain == NULL)
opts->h_cipher_chain = opts->cipher_chain;
if (opts->h_prf_algo == NULL)
opts->h_prf_algo = opts->prf_algo;
if ((error = get_disk_info(opts->dev, &blocks, &blksz)) != 0) {
tc_log(1, "could not get disk info\n");
return -1;
}
if ((blocks*blksz) <= MIN_VOL_BYTES) {
tc_log(1, "Cannot create volumes on devices with less "
"than %d bytes\n", MIN_VOL_BYTES);
return -1;
}
if (opts->interactive) {
if (((pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) ||
((pass_again = alloc_safe_mem(PASS_BUFSZ)) == NULL)) {
tc_log(1, "could not allocate safe passphrase memory\n");
goto out;
}
if ((error = read_passphrase("Passphrase: ", pass, MAX_PASSSZ,
PASS_BUFSZ, 0) ||
(read_passphrase("Repeat passphrase: ", pass_again,
MAX_PASSSZ, PASS_BUFSZ, 0)))) {
tc_log(1, "could not read passphrase\n");
goto out;
}
if (strcmp(pass, pass_again) != 0) {
tc_log(1, "Passphrases don't match\n");
goto out;
}
free_safe_mem(pass_again);
pass_again = NULL;
} else {
/* In batch mode, use provided passphrase */
if ((pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) {
tc_log(1, "could not allocate safe "
"passphrase memory");
goto out;
}
if (opts->passphrase != NULL) {
strncpy(pass, opts->passphrase, MAX_PASSSZ);
pass[MAX_PASSSZ] = '\0';
}
}
if (opts->nkeyfiles > 0) {
/* Apply keyfiles to 'pass' */
if ((error = apply_keyfiles((unsigned char *)pass, PASS_BUFSZ,
opts->keyfiles, opts->nkeyfiles))) {
tc_log(1, "could not apply keyfiles\n");
goto out;
}
}
if (opts->hidden) {
if (opts->interactive) {
if (((h_pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) ||
((pass_again = alloc_safe_mem(PASS_BUFSZ)) == NULL)) {
tc_log(1, "could not allocate safe "
"passphrase memory\n");
goto out;
}
if ((error = read_passphrase("Passphrase for hidden volume: ",
h_pass, MAX_PASSSZ, PASS_BUFSZ, 0) ||
(read_passphrase("Repeat passphrase: ", pass_again,
MAX_PASSSZ, PASS_BUFSZ, 0)))) {
tc_log(1, "could not read passphrase\n");
goto out;
}
if (strcmp(h_pass, pass_again) != 0) {
tc_log(1, "Passphrases for hidden volume don't "
"match\n");
goto out;
}
free_safe_mem(pass_again);
pass_again = NULL;
} else {
/* In batch mode, use provided passphrase */
if ((h_pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) {
tc_log(1, "could not allocate safe "
"passphrase memory");
goto out;
}
if (opts->h_passphrase != NULL) {
strncpy(h_pass, opts->h_passphrase, MAX_PASSSZ);
h_pass[MAX_PASSSZ] = '\0';
}
}
if (opts->n_hkeyfiles > 0) {
/* Apply keyfiles to 'h_pass' */
if ((error = apply_keyfiles((unsigned char *)h_pass,
PASS_BUFSZ, opts->h_keyfiles, opts->n_hkeyfiles))) {
tc_log(1, "could not apply keyfiles\n");
goto out;
}
}
if (opts->interactive) {
hidden_blocks = 0;
} else {
hidden_blocks = opts->hidden_size_bytes/blksz;
if (hidden_blocks == 0) {
tc_log(1, "hidden_blocks to create volume "
"cannot be zero!\n");
goto out;
}
if (opts->hidden_size_bytes >=
(blocks*blksz) - MIN_VOL_BYTES) {
tc_log(1, "Hidden volume needs to be "
"smaller than the outer volume\n");
goto out;
}
}
/* This only happens in interactive mode */
while (hidden_blocks == 0) {
if ((r = _humanize_number(buf, sizeof(buf),
(uint64_t)(blocks * blksz))) < 0) {
sprintf(buf, "%"DISKSZ_FMT" bytes", (blocks * blksz));
}
printf("The total volume size of %s is %s (bytes)\n", opts->dev, buf);
memset(buf, 0, sizeof(buf));
printf("Size of hidden volume (e.g. 127M): ");
fflush(stdout);
if ((fgets(buf, sizeof(buf), stdin)) == NULL) {
tc_log(1, "Could not read from stdin\n");
goto out;
}
/* get rid of trailing newline */
buf[strlen(buf)-1] = '\0';
if ((error = _dehumanize_number(buf,
&tmp)) != 0) {
tc_log(1, "Could not interpret input: %s\n", buf);
continue;
}
if (tmp >= (blocks*blksz) - MIN_VOL_BYTES) {
tc_log(1, "Hidden volume needs to be "
"smaller than the outer volume\n");
hidden_blocks = 0;
continue;
}
hidden_blocks = (size_t)tmp;
hidden_blocks /= blksz;
}
}
if (opts->interactive) {
/* Show summary and ask for confirmation */
printf("Summary of actions:\n");
if (opts->secure_erase)
printf(" - Completely erase *EVERYTHING* on %s\n", opts->dev);
printf(" - Create %svolume on %s\n", opts->hidden?("outer "):"", opts->dev);
if (opts->hidden) {
printf(" - Create hidden volume of %"DISKSZ_FMT" bytes at end of "
"outer volume\n",
hidden_blocks * blksz);
}
printf("\n Are you sure you want to proceed? (y/n) ");
fflush(stdout);
if ((fgets(buf, sizeof(buf), stdin)) == NULL) {
tc_log(1, "Could not read from stdin\n");
goto out;
}
if ((buf[0] != 'y') && (buf[0] != 'Y')) {
tc_log(1, "User cancelled action(s)\n");
goto out;
}
}
/* erase volume */
if (opts->secure_erase) {
tc_log(0, "Securely erasing the volume...\nThis process may take "
"some time depending on the size of the volume\n");
if (opts->state_change_fn)
opts->state_change_fn(opts->api_ctx, "secure_erase", 1);
if ((error = secure_erase(opts->dev, blocks * blksz, blksz)) != 0) {
tc_log(1, "could not securely erase device %s\n", opts->dev);
goto out;
}
if (opts->state_change_fn)
opts->state_change_fn(opts->api_ctx, "secure_erase", 0);
}
tc_log(0, "Creating volume headers...\nDepending on your system, this "
"process may take a few minutes as it uses true random data which "
"might take a while to refill\n");
if (opts->weak_keys_and_salt) {
tc_log(0, "WARNING: Using a weak random generator to get "
"entropy for the key material. Odds are this is NOT "
"what you want.\n");
}
if (opts->state_change_fn)
opts->state_change_fn(opts->api_ctx, "create_header", 1);
/* create encrypted headers */
ehdr = create_hdr((unsigned char *)pass,
(opts->nkeyfiles > 0)?MAX_PASSSZ:strlen(pass),
opts->prf_algo, opts->cipher_chain, blksz, blocks, VOL_RSVD_BYTES_START/blksz,
blocks - (MIN_VOL_BYTES/blksz), 0, opts->weak_keys_and_salt, &ehdr_backup);
if (ehdr == NULL) {
tc_log(1, "Could not create header\n");
goto out;
}
if (opts->hidden) {
hehdr = create_hdr((unsigned char *)h_pass,
(opts->n_hkeyfiles > 0)?MAX_PASSSZ:strlen(h_pass), opts->h_prf_algo,
opts->h_cipher_chain,
blksz, blocks,
blocks - (VOL_RSVD_BYTES_END/blksz) - hidden_blocks,
hidden_blocks, 1, opts->weak_keys_and_salt, &hehdr_backup);
if (hehdr == NULL) {
tc_log(1, "Could not create hidden volume header\n");
goto out;
}
}
if (opts->state_change_fn)
opts->state_change_fn(opts->api_ctx, "create_header", 0);
tc_log(0, "Writing volume headers to disk...\n");
if ((error = write_to_disk(opts->dev, 0, blksz, ehdr, sizeof(*ehdr))) != 0) {
tc_log(1, "Could not write volume header to device\n");
goto out;
}
/* Write backup header; it's offset is relative to the end */
if ((error = write_to_disk(opts->dev, (blocks*blksz - BACKUP_HDR_OFFSET_END),
blksz, ehdr_backup, sizeof(*ehdr_backup))) != 0) {
tc_log(1, "Could not write backup volume header to device\n");
goto out;
}
if (opts->hidden) {
if ((error = write_to_disk(opts->dev, HDR_OFFSET_HIDDEN, blksz, hehdr,
sizeof(*hehdr))) != 0) {
tc_log(1, "Could not write hidden volume header to "
"device\n");
goto out;
}
/* Write backup hidden header; offset is relative to end */
if ((error = write_to_disk(opts->dev,
(blocks*blksz - BACKUP_HDR_HIDDEN_OFFSET_END), blksz,
hehdr_backup, sizeof(*hehdr_backup))) != 0) {
tc_log(1, "Could not write backup hidden volume "
"header to device\n");
goto out;
}
}
/* Everything went ok */
tc_log(0, "All done!\n");
ret = 0;
out:
if (pass)
free_safe_mem(pass);
if (h_pass)
free_safe_mem(h_pass);
if (pass_again)
free_safe_mem(pass_again);
if (ehdr)
free_safe_mem(ehdr);
if (hehdr)
free_safe_mem(hehdr);
if (ehdr_backup)
free_safe_mem(ehdr_backup);
if (hehdr_backup)
free_safe_mem(hehdr_backup);
return ret;
}
struct tcplay_info *
info_map_common(struct tcplay_opts *opts, char *passphrase_out)
{
struct tchdr_enc *ehdr, *hehdr = NULL;
struct tcplay_info *info, *hinfo = NULL;
char *pass;
char *h_pass;
int error, error2 = 0;
size_t sz;
size_t blksz;
disksz_t blocks;
int is_hidden = 0;
int try_empty = 0;
int retries;
if ((error = get_disk_info(opts->dev, &blocks, &blksz)) != 0) {
tc_log(1, "could not get disk information\n");
return NULL;
}
if (opts->retries < 1)
retries = 1;
else
retries = opts->retries;
/*
* Add one retry so we can do a first try without asking for
* a password if keyfiles are passed in.
*/
if (opts->interactive &&
!opts->prompt_passphrase &&
(opts->nkeyfiles > 0)) {
try_empty = 1;
++retries;
}
info = NULL;
ehdr = NULL;
pass = h_pass = NULL;
while ((info == NULL) && retries-- > 0)
{
pass = h_pass = NULL;
ehdr = hehdr = NULL;
info = hinfo = NULL;
if ((pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) {
tc_log(1, "could not allocate safe passphrase memory\n");
goto out;
}
if (try_empty) {
pass[0] = '\0';
} else if (opts->interactive) {
if ((error = read_passphrase("Passphrase: ", pass,
MAX_PASSSZ, PASS_BUFSZ, opts->timeout))) {
tc_log(1, "could not read passphrase\n");
/* XXX: handle timeout differently? */
goto out;
}
pass[MAX_PASSSZ] = '\0';
} else {
/* In batch mode, use provided passphrase */
if (opts->passphrase != NULL) {
strncpy(pass, opts->passphrase, MAX_PASSSZ);
pass[MAX_PASSSZ] = '\0';
}
}
if (passphrase_out != NULL) {
strcpy(passphrase_out, pass);
}
if (opts->nkeyfiles > 0) {
/* Apply keyfiles to 'pass' */
if ((error = apply_keyfiles((unsigned char *)pass, PASS_BUFSZ,
opts->keyfiles, opts->nkeyfiles))) {
tc_log(1, "could not apply keyfiles");
goto out;
}
}
if (opts->protect_hidden) {
if ((h_pass = alloc_safe_mem(PASS_BUFSZ)) == NULL) {
tc_log(1, "could not allocate safe passphrase memory\n");
goto out;
}
if (opts->interactive) {
if ((error = read_passphrase(
"Passphrase for hidden volume: ", h_pass,
MAX_PASSSZ, PASS_BUFSZ, opts->timeout))) {
tc_log(1, "could not read passphrase\n");
goto out;
}
h_pass[MAX_PASSSZ] = '\0';
} else {
/* In batch mode, use provided passphrase */
if (opts->h_passphrase != NULL) {
strncpy(h_pass, opts->h_passphrase, MAX_PASSSZ);
h_pass[MAX_PASSSZ] = '\0';
}
}
if (opts->n_hkeyfiles > 0) {
/* Apply keyfiles to 'pass' */
if ((error = apply_keyfiles((unsigned char *)h_pass, PASS_BUFSZ,
opts->h_keyfiles, opts->n_hkeyfiles))) {
tc_log(1, "could not apply keyfiles");
goto out;
}
}
}
/* Always read blksz-sized chunks */
sz = blksz;
if (TC_FLAG_SET(opts->flags, HDR_FROM_FILE)) {
ehdr = (struct tchdr_enc *)read_to_safe_mem(
opts->hdr_file_in, 0, &sz);
if (ehdr == NULL) {
tc_log(1, "error read hdr_enc: %s", opts->hdr_file_in);
goto out;
}
} else {
ehdr = (struct tchdr_enc *)read_to_safe_mem(
(TC_FLAG_SET(opts->flags, SYS)) ? opts->sys_dev : opts->dev,
(TC_FLAG_SET(opts->flags, SYS) || TC_FLAG_SET(opts->flags, FDE)) ?
HDR_OFFSET_SYS :
(!TC_FLAG_SET(opts->flags, BACKUP)) ? 0 : -BACKUP_HDR_OFFSET_END,
&sz);
if (ehdr == NULL) {
tc_log(1, "error read hdr_enc: %s", opts->dev);
goto out;
}
}
if (!TC_FLAG_SET(opts->flags, SYS)) {
/* Always read blksz-sized chunks */
sz = blksz;
if (TC_FLAG_SET(opts->flags, H_HDR_FROM_FILE)) {
hehdr = (struct tchdr_enc *)read_to_safe_mem(
opts->h_hdr_file_in, 0, &sz);
if (hehdr == NULL) {
tc_log(1, "error read hdr_enc: %s", opts->h_hdr_file_in);
goto out;
}
} else {
hehdr = (struct tchdr_enc *)read_to_safe_mem(opts->dev,
(!TC_FLAG_SET(opts->flags, BACKUP)) ? HDR_OFFSET_HIDDEN :