/*
* libdevmapper - device-mapper backend for cryptsetup
*
* Copyright (C) 2004 Jana Saout <jana@saout.de>
* Copyright (C) 2004-2007 Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2020 Red Hat, Inc. All rights reserved.
* Copyright (C) 2009-2020 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdbool.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <libdevmapper.h>
#include <linux/fs.h>
#include <uuid/uuid.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_SYSMACROS_H
# include <sys/sysmacros.h> /* for major, minor */
#endif
#include "internal.h"
#define DM_UUID_LEN 129
#define DM_BY_ID_PREFIX "dm-uuid-"
#define DM_BY_ID_PREFIX_LEN 8
#define DM_UUID_PREFIX "CRYPT-"
#define DM_UUID_PREFIX_LEN 6
#define DM_CRYPT_TARGET "crypt"
#define DM_VERITY_TARGET "verity"
#define DM_INTEGRITY_TARGET "integrity"
#define DM_LINEAR_TARGET "linear"
#define DM_ERROR_TARGET "error"
#define DM_ZERO_TARGET "zero"
#define RETRY_COUNT 5
/* Set if DM target versions were probed */
static bool _dm_ioctl_checked = false;
static bool _dm_crypt_checked = false;
static bool _dm_verity_checked = false;
static bool _dm_integrity_checked = false;
static int _quiet_log = 0;
static uint32_t _dm_flags = 0;
static struct crypt_device *_context = NULL;
static int _dm_use_count = 0;
/* Check if we have DM flag to instruct kernel to force wipe buffers */
#if !HAVE_DECL_DM_TASK_SECURE_DATA
static int dm_task_secure_data(struct dm_task *dmt) { return 1; }
#endif
/* Compatibility for old device-mapper without udev support */
#if HAVE_DECL_DM_UDEV_DISABLE_DISK_RULES_FLAG
#define CRYPT_TEMP_UDEV_FLAGS DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG | \
DM_UDEV_DISABLE_DISK_RULES_FLAG | \
DM_UDEV_DISABLE_OTHER_RULES_FLAG
#define _dm_task_set_cookie dm_task_set_cookie
#define _dm_udev_wait dm_udev_wait
#else
#define CRYPT_TEMP_UDEV_FLAGS 0
static int _dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags) { return 0; }
static int _dm_udev_wait(uint32_t cookie) { return 0; };
#endif
static int _dm_use_udev(void)
{
#ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
return dm_udev_get_sync_support();
#else
return 0;
#endif
}
__attribute__((format(printf, 4, 5)))
static void set_dm_error(int level,
const char *file __attribute__((unused)),
int line __attribute__((unused)),
const char *f, ...)
{
char *msg = NULL;
va_list va;
va_start(va, f);
if (vasprintf(&msg, f, va) > 0) {
if (level < 4 && !_quiet_log) {
log_err(_context, "%s", msg);
} else {
/* We do not use DM visual stack backtrace here */
if (strncmp(msg, "<backtrace>", 11))
log_dbg(_context, "%s", msg);
}
}
free(msg);
va_end(va);
}
static int _dm_satisfies_version(unsigned target_maj, unsigned target_min, unsigned target_patch,
unsigned actual_maj, unsigned actual_min, unsigned actual_patch)
{
if (actual_maj > target_maj)
return 1;
if (actual_maj == target_maj && actual_min > target_min)
return 1;
if (actual_maj == target_maj && actual_min == target_min && actual_patch >= target_patch)
return 1;
return 0;
}
static void _dm_set_crypt_compat(struct crypt_device *cd,
unsigned crypt_maj,
unsigned crypt_min,
unsigned crypt_patch)
{
if (_dm_crypt_checked || crypt_maj == 0)
return;
log_dbg(cd, "Detected dm-crypt version %i.%i.%i.",
crypt_maj, crypt_min, crypt_patch);
if (_dm_satisfies_version(1, 2, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_KEY_WIPE_SUPPORTED;
else
log_dbg(cd, "Suspend and resume disabled, no wipe key support.");
if (_dm_satisfies_version(1, 10, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_LMK_SUPPORTED;
/* not perfect, 2.6.33 supports with 1.7.0 */
if (_dm_satisfies_version(1, 8, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_PLAIN64_SUPPORTED;
if (_dm_satisfies_version(1, 11, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_DISCARDS_SUPPORTED;
if (_dm_satisfies_version(1, 13, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_TCW_SUPPORTED;
if (_dm_satisfies_version(1, 14, 0, crypt_maj, crypt_min, crypt_patch)) {
_dm_flags |= DM_SAME_CPU_CRYPT_SUPPORTED;
_dm_flags |= DM_SUBMIT_FROM_CRYPT_CPUS_SUPPORTED;
}
if (_dm_satisfies_version(1, 18, 1, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_KERNEL_KEYRING_SUPPORTED;
if (_dm_satisfies_version(1, 17, 0, crypt_maj, crypt_min, crypt_patch)) {
_dm_flags |= DM_SECTOR_SIZE_SUPPORTED;
_dm_flags |= DM_CAPI_STRING_SUPPORTED;
}
if (_dm_satisfies_version(1, 19, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_BITLK_EBOIV_SUPPORTED;
if (_dm_satisfies_version(1, 20, 0, crypt_maj, crypt_min, crypt_patch))
_dm_flags |= DM_BITLK_ELEPHANT_SUPPORTED;
_dm_crypt_checked = true;
}
static void _dm_set_verity_compat(struct crypt_device *cd,
unsigned verity_maj,
unsigned verity_min,
unsigned verity_patch)
{
if (_dm_verity_checked || verity_maj == 0)
return;
log_dbg(cd, "Detected dm-verity version %i.%i.%i.",
verity_maj, verity_min, verity_patch);
_dm_flags |= DM_VERITY_SUPPORTED;
/*
* ignore_corruption, restart_on corruption is available since 1.2 (kernel 4.1)
* ignore_zero_blocks since 1.3 (kernel 4.5)
* (but some dm-verity targets 1.2 don't support it)
* FEC is added in 1.3 as well.
* Check at most once is added in 1.4 (kernel 4.17).
*/
if (_dm_satisfies_version(1, 3, 0, verity_maj, verity_min, verity_patch)) {
_dm_flags |= DM_VERITY_ON_CORRUPTION_SUPPORTED;
_dm_flags |= DM_VERITY_FEC_SUPPORTED;
}
if (_dm_satisfies_version(1, 5, 0, verity_maj, verity_min, verity_patch))
_dm_flags |= DM_VERITY_SIGNATURE_SUPPORTED;
_dm_verity_checked = true;
}
static void _dm_set_integrity_compat(struct crypt_device *cd,
unsigned integrity_maj,
unsigned integrity_min,
unsigned integrity_patch)
{
if (_dm_integrity_checked || integrity_maj == 0)
return;
log_dbg(cd, "Detected dm-integrity version %i.%i.%i.",
integrity_maj, integrity_min, integrity_patch);
_dm_flags |= DM_INTEGRITY_SUPPORTED;
if (_dm_satisfies_version(1, 2, 0, integrity_maj, integrity_min, integrity_patch))
_dm_flags |= DM_INTEGRITY_RECALC_SUPPORTED;
if (_dm_satisfies_version(1, 3, 0, integrity_maj, integrity_min, integrity_patch))
_dm_flags |= DM_INTEGRITY_BITMAP_SUPPORTED;
if (_dm_satisfies_version(1, 4, 0, integrity_maj, integrity_min, integrity_patch))
_dm_flags |= DM_INTEGRITY_FIX_PADDING_SUPPORTED;
if (_dm_satisfies_version(1, 6, 0, integrity_maj, integrity_min, integrity_patch))
_dm_flags |= DM_INTEGRITY_DISCARDS_SUPPORTED;
_dm_integrity_checked = true;
}
/* We use this for loading target module */
static void _dm_check_target(dm_target_type target_type)
{
#if HAVE_DECL_DM_DEVICE_GET_TARGET_VERSION
struct dm_task *dmt;
const char *target_name = NULL;
if (!(_dm_flags & DM_GET_TARGET_VERSION_SUPPORTED))
return;
if (target_type == DM_CRYPT)
target_name = DM_CRYPT_TARGET;
else if (target_type == DM_VERITY)
target_name = DM_VERITY_TARGET;
else if (target_type == DM_INTEGRITY)
target_name = DM_INTEGRITY_TARGET;
else
return;
if (!(dmt = dm_task_create(DM_DEVICE_GET_TARGET_VERSION)))
goto out;
if (!dm_task_set_name(dmt, target_name))
goto out;
if (!dm_task_run(dmt))
goto out;
out:
if (dmt)
dm_task_destroy(dmt);
#endif
}
static int _dm_check_versions(struct crypt_device *cd, dm_target_type target_type)
{
struct dm_task *dmt;
struct dm_versions *target, *last_target;
char dm_version[16];
unsigned dm_maj, dm_min, dm_patch;
int r = 0;
if ((target_type == DM_CRYPT && _dm_crypt_checked) ||
(target_type == DM_VERITY && _dm_verity_checked) ||
(target_type == DM_INTEGRITY && _dm_integrity_checked) ||
(target_type == DM_LINEAR) || (target_type == DM_ZERO) ||
(_dm_crypt_checked && _dm_verity_checked && _dm_integrity_checked))
return 1;
/* Shut up DM while checking */
_quiet_log = 1;
_dm_check_target(target_type);
/* FIXME: add support to DM so it forces crypt target module load here */
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
goto out;
if (!dm_task_run(dmt))
goto out;
if (!dm_task_get_driver_version(dmt, dm_version, sizeof(dm_version)))
goto out;
if (!_dm_ioctl_checked) {
if (sscanf(dm_version, "%u.%u.%u", &dm_maj, &dm_min, &dm_patch) != 3)
goto out;
log_dbg(cd, "Detected dm-ioctl version %u.%u.%u.", dm_maj, dm_min, dm_patch);
if (_dm_satisfies_version(4, 20, 0, dm_maj, dm_min, dm_patch))
_dm_flags |= DM_SECURE_SUPPORTED;
#if HAVE_DECL_DM_TASK_DEFERRED_REMOVE
if (_dm_satisfies_version(4, 27, 0, dm_maj, dm_min, dm_patch))
_dm_flags |= DM_DEFERRED_SUPPORTED;
#endif
#if HAVE_DECL_DM_DEVICE_GET_TARGET_VERSION
if (_dm_satisfies_version(4, 41, 0, dm_maj, dm_min, dm_patch))
_dm_flags |= DM_GET_TARGET_VERSION_SUPPORTED;
#endif
}
target = dm_task_get_versions(dmt);
do {
last_target = target;
if (!strcmp(DM_CRYPT_TARGET, target->name)) {
_dm_set_crypt_compat(cd, (unsigned)target->version[0],
(unsigned)target->version[1],
(unsigned)target->version[2]);
} else if (!strcmp(DM_VERITY_TARGET, target->name)) {
_dm_set_verity_compat(cd, (unsigned)target->version[0],
(unsigned)target->version[1],
(unsigned)target->version[2]);
} else if (!strcmp(DM_INTEGRITY_TARGET, target->name)) {
_dm_set_integrity_compat(cd, (unsigned)target->version[0],
(unsigned)target->version[1],
(unsigned)target->version[2]);
}
target = (struct dm_versions *)((char *) target + target->next);
} while (last_target != target);
r = 1;
if (!_dm_ioctl_checked)
log_dbg(cd, "Device-mapper backend running with UDEV support %sabled.",
_dm_use_udev() ? "en" : "dis");
_dm_ioctl_checked = true;
out:
if (dmt)
dm_task_destroy(dmt);
_quiet_log = 0;
return r;
}
int dm_flags(struct crypt_device *cd, dm_target_type target, uint32_t *flags)
{
_dm_check_versions(cd, target);
*flags = _dm_flags;
if (target == DM_UNKNOWN &&
_dm_crypt_checked && _dm_verity_checked && _dm_integrity_checked)
return 0;
if ((target == DM_CRYPT && _dm_crypt_checked) ||
(target == DM_VERITY && _dm_verity_checked) ||
(target == DM_INTEGRITY && _dm_integrity_checked) ||
(target == DM_LINEAR) || (target == DM_ZERO)) /* nothing to check */
return 0;
return -ENODEV;
}
/* This doesn't run any kernel checks, just set up userspace libdevmapper */
void dm_backend_init(struct crypt_device *cd)
{
if (!_dm_use_count++) {
log_dbg(cd, "Initialising device-mapper backend library.");
dm_log_init(set_dm_error);
dm_log_init_verbose(10);
}
}
void dm_backend_exit(struct crypt_device *cd)
{
if (_dm_use_count && (!--_dm_use_count)) {
log_dbg(cd, "Releasing device-mapper backend.");
dm_log_init_verbose(0);
dm_log_init(NULL);
dm_lib_release();
}
}
/*
* libdevmapper is not context friendly, switch context on every DM call.
* FIXME: this is not safe if called in parallel but neither is DM lib.
*/
static int dm_init_context(struct crypt_device *cd, dm_target_type target)
{
_context = cd;
if (!_dm_check_versions(cd, target)) {
if (getuid() || geteuid())
log_err(cd, _("Cannot initialize device-mapper, "
"running as non-root user."));
else
log_err(cd, _("Cannot initialize device-mapper. "
"Is dm_mod kernel module loaded?"));
_context = NULL;
return -ENOTSUP;
}
return 0;
}
static void dm_exit_context(void)
{
_context = NULL;
}
/* Return path to DM device */
char *dm_device_path(const char *prefix, int major, int minor)
{
struct dm_task *dmt;
const char *name;
char path[PATH_MAX];
if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
return NULL;
if (!dm_task_set_minor(dmt, minor) ||
!dm_task_set_major(dmt, major) ||
!dm_task_no_flush(dmt) ||
!dm_task_run(dmt) ||
!(name = dm_task_get_name(dmt))) {
dm_task_destroy(dmt);
return NULL;
}
if (snprintf(path, sizeof(path), "%s%s", prefix ?: "", name) < 0)
path[0] = '\0';
dm_task_destroy(dmt);
return strdup(path);
}
char *dm_device_name(const char *path)
{
struct stat st;
if (stat(path, &st) < 0 || !S_ISBLK(st.st_mode))
return NULL;
return dm_device_path(NULL, major(st.st_rdev), minor(st.st_rdev));
}
static void hex_key(char *hexkey, size_t key_size, const char *key)
{
unsigned i;
for(i = 0; i < key_size; i++)
sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
}
static size_t int_log10(uint64_t x)
{
uint64_t r = 0;
for (x /= 10; x > 0; x /= 10)
r++;
return r;
}
#define CLEN 64 /* 2*MAX_CIPHER_LEN */
#define CLENS "63" /* for sscanf length + '\0' */
#define CAPIL 144 /* should be enough to fit whole capi string */
#define CAPIS "143" /* for sscanf of crypto API string + 16 + \0 */
static int cipher_c2dm(const char *org_c, const char *org_i, unsigned tag_size,
char *c_dm, int c_dm_size,
char *i_dm, int i_dm_size)
{
int c_size = 0, i_size = 0, i;
char cipher[CLEN], mode[CLEN], iv[CLEN+1], tmp[CLEN];
char capi[CAPIL];
if (!c_dm || !c_dm_size || !i_dm || !i_dm_size)
return -EINVAL;
i = sscanf(org_c, "%" CLENS "[^-]-%" CLENS "s", cipher, tmp);
if (i != 2)
return -EINVAL;
i = sscanf(tmp, "%" CLENS "[^-]-%" CLENS "s", mode, iv);
if (i == 1) {
memset(iv, 0, sizeof(iv));
strncpy(iv, mode, sizeof(iv)-1);
*mode = '\0';
if (snprintf(capi, sizeof(capi), "%s", cipher) < 0)
return -EINVAL;
} else if (i == 2) {
if (snprintf(capi, sizeof(capi), "%s(%s)", mode, cipher) < 0)
return -EINVAL;
} else
return -EINVAL;
if (!org_i) {
/* legacy mode: CIPHER-MODE-IV*/
i_size = snprintf(i_dm, i_dm_size, "%s", "");
c_size = snprintf(c_dm, c_dm_size, "%s", org_c);
} else if (!strcmp(org_i, "none")) {
/* IV only: capi:MODE(CIPHER)-IV */
i_size = snprintf(i_dm, i_dm_size, " integrity:%u:none", tag_size);
c_size = snprintf(c_dm, c_dm_size, "capi:%s-%s", capi, iv);
} else if (!strcmp(org_i, "aead") && !strcmp(mode, "ccm")) {
/* CCM AEAD: capi:rfc4309(MODE(CIPHER))-IV */
i_size = snprintf(i_dm, i_dm_size, " integrity:%u:aead", tag_size);
c_size = snprintf(c_dm, c_dm_size, "capi:rfc4309(%s)-%s", capi, iv);
} else if (!strcmp(org_i, "aead")) {
/* AEAD: capi:MODE(CIPHER))-IV */
i_size = snprintf(i_dm, i_dm_size, " integrity:%u:aead", tag_size);
c_size = snprintf(c_dm, c_dm_size, "capi:%s-%s", capi, iv);
} else if (!strcmp(org_i, "poly1305")) {
/* POLY1305 AEAD: capi:rfc7539(MODE(CIPHER),POLY1305)-IV */
i_size = snprintf(i_dm, i_dm_size, " integrity:%u:aead", tag_size);
c_size = snprintf(c_dm, c_dm_size, "capi:rfc7539(%s,poly1305)-%s", capi, iv);
} else {
/* other AEAD: capi:authenc(<AUTH>,MODE(CIPHER))-IV */
i_size = snprintf(i_dm, i_dm_size, " integrity:%u:aead", tag_size);
c_size = snprintf(c_dm, c_dm_size, "capi:authenc(%s,%s)-%s", org_i, capi, iv);
}
if (c_size < 0 || c_size == c_dm_size)
return -EINVAL;
if (i_size < 0 || i_size == i_dm_size)
return -EINVAL;
return 0;
}
static int cipher_dm2c(char **org_c, char **org_i, const char *c_dm, const char *i_dm)
{
char cipher[CLEN], mode[CLEN], iv[CLEN], auth[CLEN];
char tmp[CAPIL], dmcrypt_tmp[CAPIL*2], capi[CAPIL+1];
size_t len;
int i;
if (!c_dm)
return -EINVAL;
/* legacy mode */
if (strncmp(c_dm, "capi:", 4)) {
if (!(*org_c = strdup(c_dm)))
return -ENOMEM;
*org_i = NULL;
return 0;
}
/* modes with capi: prefix */
i = sscanf(c_dm, "capi:%" CAPIS "[^-]-%" CLENS "s", tmp, iv);
if (i != 2)
return -EINVAL;
len = strlen(tmp);
if (len < 2)
return -EINVAL;
if (tmp[len-1] == ')')
tmp[len-1] = '\0';
if (sscanf(tmp, "rfc4309(%" CAPIS "s", capi) == 1) {
if (!(*org_i = strdup("aead")))
return -ENOMEM;
} else if (sscanf(tmp, "rfc7539(%" CAPIS "[^,],%" CLENS "s", capi, auth) == 2) {
if (!(*org_i = strdup(auth)))
return -ENOMEM;
} else if (sscanf(tmp, "authenc(%" CLENS "[^,],%" CAPIS "s", auth, capi) == 2) {
if (!(*org_i = strdup(auth)))
return -ENOMEM;
} else {
if (i_dm) {
if (!(*org_i = strdup(i_dm)))
return -ENOMEM;
} else
*org_i = NULL;
memset(capi, 0, sizeof(capi));
strncpy(capi, tmp, sizeof(capi)-1);
}
i = sscanf(capi, "%" CLENS "[^(](%" CLENS "[^)])", mode, cipher);
if (i == 2)
snprintf(dmcrypt_tmp, sizeof(dmcrypt_tmp), "%s-%s-%s", cipher, mode, iv);
else
snprintf(dmcrypt_tmp, sizeof(dmcrypt_tmp), "%s-%s", capi, iv);
if (!(*org_c = strdup(dmcrypt_tmp))) {
free(*org_i);
*org_i = NULL;
return -ENOMEM;
}
return 0;
}
/* https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt */
static char *get_dm_crypt_params(const struct dm_target *tgt, uint32_t flags)
{
int r, max_size, null_cipher = 0, num_options = 0, keystr_len = 0;
char *params, *hexkey;
char sector_feature[32], features[512], integrity_dm[256], cipher_dm[256];
if (!tgt)
return NULL;
r = cipher_c2dm(tgt->u.crypt.cipher, tgt->u.crypt.integrity, tgt->u.crypt.tag_size,
cipher_dm, sizeof(cipher_dm), integrity_dm, sizeof(integrity_dm));
if (r < 0)
return NULL;
if (flags & CRYPT_ACTIVATE_ALLOW_DISCARDS)
num_options++;
if (flags & CRYPT_ACTIVATE_SAME_CPU_CRYPT)
num_options++;
if (flags & CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS)
num_options++;
if (flags & CRYPT_ACTIVATE_IV_LARGE_SECTORS)
num_options++;
if (tgt->u.crypt.integrity)
num_options++;
if (tgt->u.crypt.sector_size != SECTOR_SIZE) {
num_options++;
snprintf(sector_feature, sizeof(sector_feature), " sector_size:%u", tgt->u.crypt.sector_size);
} else
*sector_feature = '\0';
if (num_options) {
snprintf(features, sizeof(features)-1, " %d%s%s%s%s%s%s", num_options,
(flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) ? " allow_discards" : "",
(flags & CRYPT_ACTIVATE_SAME_CPU_CRYPT) ? " same_cpu_crypt" : "",
(flags & CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS) ? " submit_from_crypt_cpus" : "",
(flags & CRYPT_ACTIVATE_IV_LARGE_SECTORS) ? " iv_large_sectors" : "",
sector_feature, integrity_dm);
} else
*features = '\0';
if (!strncmp(cipher_dm, "cipher_null-", 12))
null_cipher = 1;
if (flags & CRYPT_ACTIVATE_KEYRING_KEY) {
keystr_len = strlen(tgt->u.crypt.vk->key_description) + int_log10(tgt->u.crypt.vk->keylength) + 10;
hexkey = crypt_safe_alloc(keystr_len);
} else
hexkey = crypt_safe_alloc(null_cipher ? 2 : (tgt->u.crypt.vk->keylength * 2 + 1));
if (!hexkey)
return NULL;
if (null_cipher)
strncpy(hexkey, "-", 2);
else if (flags & CRYPT_ACTIVATE_KEYRING_KEY) {
r = snprintf(hexkey, keystr_len, ":%zu:logon:%s", tgt->u.crypt.vk->keylength, tgt->u.crypt.vk->key_description);
if (r < 0 || r >= keystr_len) {
params = NULL;
goto out;
}
} else
hex_key(hexkey, tgt->u.crypt.vk->keylength, tgt->u.crypt.vk->key);
max_size = strlen(hexkey) + strlen(cipher_dm) +
strlen(device_block_path(tgt->data_device)) +
strlen(features) + 64;
params = crypt_safe_alloc(max_size);
if (!params)
goto out;
r = snprintf(params, max_size, "%s %s %" PRIu64 " %s %" PRIu64 "%s",
cipher_dm, hexkey, tgt->u.crypt.iv_offset,
device_block_path(tgt->data_device), tgt->u.crypt.offset,
features);
if (r < 0 || r >= max_size) {
crypt_safe_free(params);
params = NULL;
}
out:
crypt_safe_free(hexkey);
return params;
}
/* https://gitlab.com/cryptsetup/cryptsetup/wikis/DMVerity */
static char *get_dm_verity_params(const struct dm_target *tgt, uint32_t flags)
{
int max_size, r, num_options = 0;
struct crypt_params_verity *vp;
char *params = NULL, *hexroot = NULL, *hexsalt = NULL;
char features[256], fec_features[256], verity_verify_args[512+32];
if (!tgt || !tgt->u.verity.vp)
return NULL;
vp = tgt->u.verity.vp;
/* These flags are not compatible */
if ((flags & CRYPT_ACTIVATE_IGNORE_CORRUPTION) &&
(flags & CRYPT_ACTIVATE_RESTART_ON_CORRUPTION))
flags &= ~CRYPT_ACTIVATE_IGNORE_CORRUPTION;
if (flags & CRYPT_ACTIVATE_IGNORE_CORRUPTION)
num_options++;
if (flags & CRYPT_ACTIVATE_RESTART_ON_CORRUPTION)
num_options++;
if (flags & CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS)
num_options++;
if (flags & CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE)
num_options++;
if (tgt->u.verity.fec_device) {
num_options += 8;
snprintf(fec_features, sizeof(fec_features)-1,
" use_fec_from_device %s fec_start %" PRIu64 " fec_blocks %" PRIu64 " fec_roots %" PRIu32,
device_block_path(tgt->u.verity.fec_device), tgt->u.verity.fec_offset,
vp->data_size + tgt->u.verity.hash_blocks, vp->fec_roots);
} else
*fec_features = '\0';
if (tgt->u.verity.root_hash_sig_key_desc) {
num_options += 2;
snprintf(verity_verify_args, sizeof(verity_verify_args)-1,
" root_hash_sig_key_desc %s", tgt->u.verity.root_hash_sig_key_desc);
} else
*verity_verify_args = '\0';
if (num_options)
snprintf(features, sizeof(features)-1, " %d%s%s%s%s", num_options,
(flags & CRYPT_ACTIVATE_IGNORE_CORRUPTION) ? " ignore_corruption" : "",
(flags & CRYPT_ACTIVATE_RESTART_ON_CORRUPTION) ? " restart_on_corruption" : "",
(flags & CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS) ? " ignore_zero_blocks" : "",
(flags & CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE) ? " check_at_most_once" : "");
else
*features = '\0';
hexroot = crypt_safe_alloc(tgt->u.verity.root_hash_size * 2 + 1);
if (!hexroot)
goto out;
hex_key(hexroot, tgt->u.verity.root_hash_size, tgt->u.verity.root_hash);
hexsalt = crypt_safe_alloc(vp->salt_size ? vp->salt_size * 2 + 1 : 2);
if (!hexsalt)
goto out;
if (vp->salt_size)
hex_key(hexsalt, vp->salt_size, vp->salt);
else
strncpy(hexsalt, "-", 2);
max_size = strlen(hexroot) + strlen(hexsalt) +
strlen(device_block_path(tgt->data_device)) +
strlen(device_block_path(tgt->u.verity.hash_device)) +
strlen(vp->hash_name) + strlen(features) + strlen(fec_features) + 128 +
strlen(verity_verify_args);
params = crypt_safe_alloc(max_size);
if (!params)
goto out;
r = snprintf(params, max_size,
"%u %s %s %u %u %" PRIu64 " %" PRIu64 " %s %s %s%s%s%s",
vp->hash_type, device_block_path(tgt->data_device),
device_block_path(tgt->u.verity.hash_device),
vp->data_block_size, vp->hash_block_size,
vp->data_size, tgt->u.verity.hash_offset,
vp->hash_name, hexroot, hexsalt, features, fec_features,
verity_verify_args);
if (r < 0 || r >= max_size) {
crypt_safe_free(params);
params = NULL;
}
out:
crypt_safe_free(hexroot);
crypt_safe_free(hexsalt);
return params;
}
static char *get_dm_integrity_params(const struct dm_target *tgt, uint32_t flags)
{
int r, max_size, num_options = 0;
char *params, *hexkey, mode;
char features[512], feature[256];
if (!tgt)
return NULL;
max_size = strlen(device_block_path(tgt->data_device)) +
(tgt->u.integrity.meta_device ? strlen(device_block_path(tgt->u.integrity.meta_device)) : 0) +
(tgt->u.integrity.vk ? tgt->u.integrity.vk->keylength * 2 : 0) +
(tgt->u.integrity.journal_integrity_key ? tgt->u.integrity.journal_integrity_key->keylength * 2 : 0) +
(tgt->u.integrity.journal_crypt_key ? tgt->u.integrity.journal_crypt_key->keylength * 2 : 0) +
(tgt->u.integrity.integrity ? strlen(tgt->u.integrity.integrity) : 0) +
(tgt->u.integrity.journal_integrity ? strlen(tgt->u.integrity.journal_integrity) : 0) +
(tgt->u.integrity.journal_crypt ? strlen(tgt->u.integrity.journal_crypt) : 0) + 128;
params = crypt_safe_alloc(max_size);
if (!params)
return NULL;
*features = '\0';
if (tgt->u.integrity.journal_size) {
num_options++;
snprintf(feature, sizeof(feature), "journal_sectors:%u ",
(unsigned)(tgt->u.integrity.journal_size / SECTOR_SIZE));
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.journal_watermark) {
num_options++;
snprintf(feature, sizeof(feature),
/* bitmap overloaded values */
(flags & CRYPT_ACTIVATE_NO_JOURNAL_BITMAP) ? "sectors_per_bit:%u " : "journal_watermark:%u ",
tgt->u.integrity.journal_watermark);
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.journal_commit_time) {
num_options++;
snprintf(feature, sizeof(feature),
/* bitmap overloaded values */
(flags & CRYPT_ACTIVATE_NO_JOURNAL_BITMAP) ? "bitmap_flush_interval:%u " : "commit_time:%u ",
tgt->u.integrity.journal_commit_time);
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.interleave_sectors) {
num_options++;
snprintf(feature, sizeof(feature), "interleave_sectors:%u ",
tgt->u.integrity.interleave_sectors);
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.sector_size) {
num_options++;
snprintf(feature, sizeof(feature), "block_size:%u ",
tgt->u.integrity.sector_size);
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.buffer_sectors) {
num_options++;
snprintf(feature, sizeof(feature), "buffer_sectors:%u ",
tgt->u.integrity.buffer_sectors);
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.integrity) {
num_options++;
if (tgt->u.integrity.vk) {
hexkey = crypt_safe_alloc(tgt->u.integrity.vk->keylength * 2 + 1);
if (!hexkey) {
crypt_safe_free(params);
return NULL;
}
hex_key(hexkey, tgt->u.integrity.vk->keylength, tgt->u.integrity.vk->key);
} else
hexkey = NULL;
snprintf(feature, sizeof(feature), "internal_hash:%s%s%s ",
tgt->u.integrity.integrity, hexkey ? ":" : "", hexkey ?: "");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
crypt_safe_free(hexkey);
}
if (tgt->u.integrity.journal_integrity) {
num_options++;
if (tgt->u.integrity.journal_integrity_key) {
hexkey = crypt_safe_alloc(tgt->u.integrity.journal_integrity_key->keylength * 2 + 1);
if (!hexkey) {
crypt_safe_free(params);
return NULL;
}
hex_key(hexkey, tgt->u.integrity.journal_integrity_key->keylength,
tgt->u.integrity.journal_integrity_key->key);
} else
hexkey = NULL;
snprintf(feature, sizeof(feature), "journal_mac:%s%s%s ",
tgt->u.integrity.journal_integrity, hexkey ? ":" : "", hexkey ?: "");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
crypt_safe_free(hexkey);
}
if (tgt->u.integrity.journal_crypt) {
num_options++;
if (tgt->u.integrity.journal_crypt_key) {
hexkey = crypt_safe_alloc(tgt->u.integrity.journal_crypt_key->keylength * 2 + 1);
if (!hexkey) {
crypt_safe_free(params);
return NULL;
}
hex_key(hexkey, tgt->u.integrity.journal_crypt_key->keylength,
tgt->u.integrity.journal_crypt_key->key);
} else
hexkey = NULL;
snprintf(feature, sizeof(feature), "journal_crypt:%s%s%s ",
tgt->u.integrity.journal_crypt, hexkey ? ":" : "", hexkey ?: "");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
crypt_safe_free(hexkey);
}
if (tgt->u.integrity.fix_padding) {
num_options++;
snprintf(feature, sizeof(feature), "fix_padding ");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (flags & CRYPT_ACTIVATE_RECALCULATE) {
num_options++;
snprintf(feature, sizeof(feature), "recalculate ");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) {
num_options++;
snprintf(feature, sizeof(feature), "allow_discards ");
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (tgt->u.integrity.meta_device) {
num_options++;
snprintf(feature, sizeof(feature), "meta_device:%s ",
device_block_path(tgt->u.integrity.meta_device));
strncat(features, feature, sizeof(features) - strlen(features) - 1);
}
if (flags & CRYPT_ACTIVATE_NO_JOURNAL_BITMAP)
mode = 'B';
else if (flags & CRYPT_ACTIVATE_RECOVERY)
mode = 'R';
else if (flags & CRYPT_ACTIVATE_NO_JOURNAL)
mode = 'D';
else
mode = 'J';
r = snprintf(params, max_size, "%s %" PRIu64 " %d %c %d %s",
device_block_path(tgt->data_device), tgt->u.integrity.offset,
tgt->u.integrity.tag_size, mode,
num_options, *features ? features : "");
if (r < 0 || r >= max_size) {
crypt_safe_free(params);
params = NULL;
}
return params;
}
static char *get_dm_linear_params(const struct dm_target *tgt, uint32_t flags)
{
char *params;
int r;
int max_size = strlen(device_block_path(tgt->data_device)) + int_log10(tgt->u.linear.offset) + 3;
params = crypt_safe_alloc(max_size);
if (!params)
return NULL;
r = snprintf(params, max_size, "%s %" PRIu64,
device_block_path(tgt->data_device), tgt->u.linear.offset);
if (r < 0 || r >= max_size) {
crypt_safe_free(params);
params = NULL;
}
return params;
}
static char *get_dm_zero_params(const struct dm_target *tgt, uint32_t flags)
{
char *params = crypt_safe_alloc(1);
if (!params)
return NULL;
params[0] = 0;
return params;
}
/* DM helpers */
static int _dm_remove(const char *name, int udev_wait, int deferred)
{
int r = 0;
struct dm_task *dmt;
uint32_t cookie = 0;
if (!_dm_use_udev())
udev_wait = 0;
if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
return 0;
if (!dm_task_set_name(dmt, name))
goto out;
#if HAVE_DECL_DM_TASK_RETRY_REMOVE
if (!dm_task_retry_remove(dmt))
goto out;
#endif
#if HAVE_DECL_DM_TASK_DEFERRED_REMOVE
if (deferred && !dm_task_deferred_remove(dmt))
goto out;
#endif
if (udev_wait && !_dm_task_set_cookie(dmt, &cookie, DM_UDEV_DISABLE_LIBRARY_FALLBACK))
goto out;
r = dm_task_run(dmt);
if (udev_wait)
(void)_dm_udev_wait(cookie);
out:
dm_task_destroy(dmt);
return r;
}
static int _dm_simple(int task, const char *name, uint32_t dmflags)
{
int r = 0;
struct dm_task *dmt;
if (!(dmt = dm_task_create(task)))
return 0;
if (name && !dm_task_set_name(dmt, name))
goto out;
if (task == DM_DEVICE_SUSPEND &&
(dmflags & DM_SUSPEND_SKIP_LOCKFS) && !dm_task_skip_lockfs(dmt))
goto out;
if (task == DM_DEVICE_SUSPEND &&
(dmflags & DM_SUSPEND_NOFLUSH) && !dm_task_no_flush(dmt))
goto out;
r = dm_task_run(dmt);
out:
dm_task_destroy(dmt);
return r;
}
static int _dm_resume_device(const char *name, uint32_t flags);
static int _error_device(const char *name, size_t size)
{
struct dm_task *dmt;
int r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
return 0;
if (!dm_task_set_name(dmt, name))
goto error;
if (!dm_task_add_target(dmt, UINT64_C(0), size, "error", ""))
goto error;
if (!dm_task_set_ro(dmt))
goto error;
if (!dm_task_no_open_count(dmt))
goto error;
if (!dm_task_run(dmt))
goto error;
if (_dm_resume_device(name, 0)) {
_dm_simple(DM_DEVICE_CLEAR, name, 0);
goto error;
}
r = 1;
error:
dm_task_destroy(dmt);
return r;
}
int dm_error_device(struct crypt_device *cd, const char *name)
{
int r;
struct crypt_dm_active_device dmd;
if (!name)
return -EINVAL;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
if ((dm_query_device(cd, name, 0, &dmd) >= 0) && _error_device(name, dmd.size))
r = 0;
else
r = -EINVAL;
dm_targets_free(cd, &dmd);
dm_exit_context();
return r;
}
int dm_clear_device(struct crypt_device *cd, const char *name)
{
int r;
if (!name)
return -EINVAL;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
if (_dm_simple(DM_DEVICE_CLEAR, name, 0))
r = 0;
else
r = -EINVAL;
dm_exit_context();
return r;
}
int dm_remove_device(struct crypt_device *cd, const char *name, uint32_t flags)
{
struct crypt_dm_active_device dmd = {};
int r = -EINVAL;
int retries = (flags & CRYPT_DEACTIVATE_FORCE) ? RETRY_COUNT : 1;
int deferred = (flags & CRYPT_DEACTIVATE_DEFERRED) ? 1 : 0;
int error_target = 0;
uint32_t dmt_flags;
if (!name)
return -EINVAL;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
if (deferred && !dm_flags(cd, DM_UNKNOWN, &dmt_flags) && !(dmt_flags & DM_DEFERRED_SUPPORTED)) {
log_err(cd, _("Requested deferred flag is not supported."));
dm_exit_context();
return -ENOTSUP;
}
do {
r = _dm_remove(name, 1, deferred) ? 0 : -EINVAL;
if (--retries && r) {
log_dbg(cd, "WARNING: other process locked internal device %s, %s.",
name, retries ? "retrying remove" : "giving up");
sleep(1);
if ((flags & CRYPT_DEACTIVATE_FORCE) && !error_target) {
/* If force flag is set, replace device with error, read-only target.
* it should stop processes from reading it and also removed underlying
* device from mapping, so it is usable again.
* Anyway, if some process try to read temporary cryptsetup device,
* it is bug - no other process should try touch it (e.g. udev).
*/
if (!dm_query_device(cd, name, 0, &dmd)) {
_error_device(name, dmd.size);
error_target = 1;
}
}
}
} while (r == -EINVAL && retries);
dm_task_update_nodes();
dm_exit_context();
return r;
}
#define UUID_LEN 37 /* 36 + \0, libuuid ... */
/*
* UUID has format: CRYPT-<devicetype>-[<uuid>-]<device name>
* CRYPT-PLAIN-name
* CRYPT-LUKS1-00000000000000000000000000000000-name
* CRYPT-TEMP-name
*/
static int dm_prepare_uuid(struct crypt_device *cd, const char *name, const char *type,
const char *uuid, char *buf, size_t buflen)
{
char *ptr, uuid2[UUID_LEN] = {0};
uuid_t uu;
unsigned i = 0;
/* Remove '-' chars */
if (uuid) {
if (uuid_parse(uuid, uu) < 0) {
log_dbg(cd, "Requested UUID %s has invalid format.", uuid);
return 0;
}
for (ptr = uuid2, i = 0; i < UUID_LEN; i++)
if (uuid[i] != '-') {
*ptr = uuid[i];
ptr++;
}
}
i = snprintf(buf, buflen, DM_UUID_PREFIX "%s%s%s%s%s",
type ?: "", type ? "-" : "",
uuid2[0] ? uuid2 : "", uuid2[0] ? "-" : "",
name);
log_dbg(cd, "DM-UUID is %s", buf);
if (i >= buflen)
log_err(cd, _("DM-UUID for device %s was truncated."), name);
return 1;
}
int lookup_dm_dev_by_uuid(struct crypt_device *cd, const char *uuid, const char *type)
{
int r;
char *c;
char dev_uuid[DM_UUID_LEN + DM_BY_ID_PREFIX_LEN] = DM_BY_ID_PREFIX;
if (!dm_prepare_uuid(cd, "", type, uuid, dev_uuid + DM_BY_ID_PREFIX_LEN, DM_UUID_LEN))
return -EINVAL;
c = strrchr(dev_uuid, '-');
if (!c)
return -EINVAL;
/* cut of dm name */
*c = '\0';
r = lookup_by_disk_id(dev_uuid);
if (r == -ENOENT) {
log_dbg(cd, "Search by disk id not available. Using sysfs instead.");
r = lookup_by_sysfs_uuid_field(dev_uuid + DM_BY_ID_PREFIX_LEN, DM_UUID_LEN);
}
return r;
}
static int _add_dm_targets(struct dm_task *dmt, struct crypt_dm_active_device *dmd)
{
const char *target;
struct dm_target *tgt = &dmd->segment;
do {
switch (tgt->type) {
case DM_CRYPT:
target = DM_CRYPT_TARGET;
break;
case DM_VERITY:
target = DM_VERITY_TARGET;
break;
case DM_INTEGRITY:
target = DM_INTEGRITY_TARGET;
break;
case DM_LINEAR:
target = DM_LINEAR_TARGET;
break;
case DM_ZERO:
target = DM_ZERO_TARGET;
break;
default:
return -ENOTSUP;
}
if (!dm_task_add_target(dmt, tgt->offset, tgt->size, target, tgt->params))
return -EINVAL;
tgt = tgt->next;
} while (tgt);
return 0;
}
static void _destroy_dm_targets_params(struct crypt_dm_active_device *dmd)
{
struct dm_target *t = &dmd->segment;
do {
crypt_safe_free(t->params);
t->params = NULL;
t = t->next;
} while (t);
}
static int _create_dm_targets_params(struct crypt_dm_active_device *dmd)
{
int r;
struct dm_target *tgt = &dmd->segment;
do {
if (tgt->type == DM_CRYPT)
tgt->params = get_dm_crypt_params(tgt, dmd->flags);
else if (tgt->type == DM_VERITY)
tgt->params = get_dm_verity_params(tgt, dmd->flags);
else if (tgt->type == DM_INTEGRITY)
tgt->params = get_dm_integrity_params(tgt, dmd->flags);
else if (tgt->type == DM_LINEAR)
tgt->params = get_dm_linear_params(tgt, dmd->flags);
else if (tgt->type == DM_ZERO)
tgt->params = get_dm_zero_params(tgt, dmd->flags);
else {
r = -ENOTSUP;
goto err;
}
if (!tgt->params) {
r = -EINVAL;
goto err;
}
tgt = tgt->next;
} while (tgt);
return 0;
err:
_destroy_dm_targets_params(dmd);
return r;
}
static int _dm_create_device(struct crypt_device *cd, const char *name, const char *type,
const char *uuid, struct crypt_dm_active_device *dmd)
{
struct dm_task *dmt = NULL;
struct dm_info dmi;
char dev_uuid[DM_UUID_LEN] = {0};
int r = -EINVAL;
uint32_t cookie = 0, read_ahead = 0;
uint16_t udev_flags = DM_UDEV_DISABLE_LIBRARY_FALLBACK;
if (dmd->flags & CRYPT_ACTIVATE_PRIVATE)
udev_flags |= CRYPT_TEMP_UDEV_FLAGS;
/* All devices must have DM_UUID, only resize on old device is exception */
if (!dm_prepare_uuid(cd, name, type, dmd->uuid, dev_uuid, sizeof(dev_uuid)))
goto out;
if (!(dmt = dm_task_create(DM_DEVICE_CREATE)))
goto out;
if (!dm_task_set_name(dmt, name))
goto out;
if (!dm_task_set_uuid(dmt, dev_uuid))
goto out;
if (!dm_task_secure_data(dmt))
goto out;
if ((dmd->flags & CRYPT_ACTIVATE_READONLY) && !dm_task_set_ro(dmt))
goto out;
r = _create_dm_targets_params(dmd);
if (r)
goto out;
r = _add_dm_targets(dmt, dmd);
if (r)
goto out;
r = -EINVAL;
#ifdef DM_READ_AHEAD_MINIMUM_FLAG
if (device_read_ahead(dmd->segment.data_device, &read_ahead) &&
!dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
goto out;
#endif
if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
goto out;
if (!dm_task_run(dmt))
goto out;
if (dm_task_get_info(dmt, &dmi))
r = 0;
if (_dm_use_udev()) {
(void)_dm_udev_wait(cookie);
cookie = 0;
}
if (r < 0)
_dm_remove(name, 1, 0);
out:
if (cookie && _dm_use_udev())
(void)_dm_udev_wait(cookie);
if (dmt)
dm_task_destroy(dmt);
dm_task_update_nodes();
/* If code just loaded target module, update versions */
_dm_check_versions(cd, dmd->segment.type);
_destroy_dm_targets_params(dmd);
return r;
}
static int _dm_resume_device(const char *name, uint32_t dmflags)
{
struct dm_task *dmt;
int r = -EINVAL;
uint32_t cookie = 0;
uint16_t udev_flags = DM_UDEV_DISABLE_LIBRARY_FALLBACK;
if (dmflags & DM_RESUME_PRIVATE)
udev_flags |= CRYPT_TEMP_UDEV_FLAGS;
if (!(dmt = dm_task_create(DM_DEVICE_RESUME)))
return r;
if (!dm_task_set_name(dmt, name))
goto out;
if ((dmflags & DM_SUSPEND_SKIP_LOCKFS) && !dm_task_skip_lockfs(dmt))
goto out;
if ((dmflags & DM_SUSPEND_NOFLUSH) && !dm_task_no_flush(dmt))
goto out;
if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
goto out;
if (dm_task_run(dmt))
r = 0;
out:
if (cookie && _dm_use_udev())
(void)_dm_udev_wait(cookie);
dm_task_destroy(dmt);
dm_task_update_nodes();
return r;
}
static int _dm_reload_device(struct crypt_device *cd, const char *name,
struct crypt_dm_active_device *dmd)
{
int r = -EINVAL;
struct dm_task *dmt = NULL;
uint32_t read_ahead = 0;
/* All devices must have DM_UUID, only resize on old device is exception */
if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
goto out;
if (!dm_task_set_name(dmt, name))
goto out;
if (!dm_task_secure_data(dmt))
goto out;
if ((dmd->flags & CRYPT_ACTIVATE_READONLY) && !dm_task_set_ro(dmt))
goto out;
r = _create_dm_targets_params(dmd);
if (r)
goto out;
r = _add_dm_targets(dmt, dmd);
if (r)
goto out;
r = -EINVAL;
#ifdef DM_READ_AHEAD_MINIMUM_FLAG
if (device_read_ahead(dmd->segment.data_device, &read_ahead) &&
!dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
goto out;
#endif
if (dm_task_run(dmt))
r = 0;
out:
if (dmt)
dm_task_destroy(dmt);
/* If code just loaded target module, update versions */
_dm_check_versions(cd, dmd->segment.type);
_destroy_dm_targets_params(dmd);
return r;
}
static void crypt_free_verity_params(struct crypt_params_verity *vp)
{
if (!vp)
return;
free(CONST_CAST(void*)vp->hash_name);
free(CONST_CAST(void*)vp->data_device);
free(CONST_CAST(void*)vp->hash_device);
free(CONST_CAST(void*)vp->fec_device);
free(CONST_CAST(void*)vp->salt);
free(vp);
}
static void _dm_target_free_query_path(struct crypt_device *cd, struct dm_target *tgt)
{
switch(tgt->type) {
case DM_CRYPT:
crypt_free_volume_key(tgt->u.crypt.vk);
free(CONST_CAST(void*)tgt->u.crypt.cipher);
break;
case DM_INTEGRITY:
free(CONST_CAST(void*)tgt->u.integrity.integrity);
crypt_free_volume_key(tgt->u.integrity.vk);
free(CONST_CAST(void*)tgt->u.integrity.journal_integrity);
crypt_free_volume_key(tgt->u.integrity.journal_integrity_key);
free(CONST_CAST(void*)tgt->u.integrity.journal_crypt);
crypt_free_volume_key(tgt->u.integrity.journal_crypt_key);
device_free(cd, tgt->u.integrity.meta_device);
break;
case DM_VERITY:
crypt_free_verity_params(tgt->u.verity.vp);
device_free(cd, tgt->u.verity.hash_device);
free(CONST_CAST(void*)tgt->u.verity.root_hash);
free(CONST_CAST(void*)tgt->u.verity.root_hash_sig_key_desc);
/* fall through */
case DM_LINEAR:
/* fall through */
case DM_ERROR:
/* fall through */
case DM_ZERO:
break;
default:
log_err(cd, _("Unknown dm target type."));
return;
}
device_free(cd, tgt->data_device);
}
static void _dm_target_erase(struct crypt_device *cd, struct dm_target *tgt)
{
if (tgt->direction == TARGET_QUERY)
_dm_target_free_query_path(cd, tgt);
if (tgt->type == DM_CRYPT)
free(CONST_CAST(void*)tgt->u.crypt.integrity);
}
void dm_targets_free(struct crypt_device *cd, struct crypt_dm_active_device *dmd)
{
struct dm_target *t = &dmd->segment, *next = t->next;
_dm_target_erase(cd, t);
while (next) {
t = next;
next = t->next;
_dm_target_erase(cd, t);
free(t);
}
memset(&dmd->segment, 0, sizeof(dmd->segment));
}
int dm_targets_allocate(struct dm_target *first, unsigned count)
{
if (!first || first->next || !count)
return -EINVAL;
while (--count) {
first->next = crypt_zalloc(sizeof(*first));
if (!first->next)
return -ENOMEM;
first = first->next;
}
return 0;
}
static int check_retry(struct crypt_device *cd, uint32_t *dmd_flags, uint32_t dmt_flags)
{
int ret = 0;
/* If discard not supported try to load without discard */
if ((*dmd_flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) &&
!(dmt_flags & DM_DISCARDS_SUPPORTED)) {
log_dbg(cd, "Discard/TRIM is not supported");
*dmd_flags = *dmd_flags & ~CRYPT_ACTIVATE_ALLOW_DISCARDS;
ret = 1;
}
/* If kernel keyring is not supported load key directly in dm-crypt */
if ((*dmd_flags & CRYPT_ACTIVATE_KEYRING_KEY) &&
!(dmt_flags & DM_KERNEL_KEYRING_SUPPORTED)) {
log_dbg(cd, "dm-crypt does not support kernel keyring");
*dmd_flags = *dmd_flags & ~CRYPT_ACTIVATE_KEYRING_KEY;
ret = 1;
}
/* Drop performance options if not supported */
if ((*dmd_flags & (CRYPT_ACTIVATE_SAME_CPU_CRYPT | CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS)) &&
!(dmt_flags & (DM_SAME_CPU_CRYPT_SUPPORTED | DM_SUBMIT_FROM_CRYPT_CPUS_SUPPORTED))) {
log_dbg(cd, "dm-crypt does not support performance options");
*dmd_flags = *dmd_flags & ~(CRYPT_ACTIVATE_SAME_CPU_CRYPT | CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS);
ret = 1;
}
return ret;
}
int dm_create_device(struct crypt_device *cd, const char *name,
const char *type,
struct crypt_dm_active_device *dmd)
{
uint32_t dmt_flags = 0;
int r = -EINVAL;
if (!type || !dmd)
return -EINVAL;
if (dm_init_context(cd, dmd->segment.type))
return -ENOTSUP;
r = _dm_create_device(cd, name, type, dmd->uuid, dmd);
if (r < 0 && dm_flags(cd, dmd->segment.type, &dmt_flags))
goto out;
if (r && (dmd->segment.type == DM_CRYPT || dmd->segment.type == DM_LINEAR || dmd->segment.type == DM_ZERO) &&
check_retry(cd, &dmd->flags, dmt_flags))
r = _dm_create_device(cd, name, type, dmd->uuid, dmd);
if (r == -EINVAL &&
dmd->flags & (CRYPT_ACTIVATE_SAME_CPU_CRYPT|CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS) &&
!(dmt_flags & (DM_SAME_CPU_CRYPT_SUPPORTED|DM_SUBMIT_FROM_CRYPT_CPUS_SUPPORTED)))
log_err(cd, _("Requested dm-crypt performance options are not supported."));
if (r == -EINVAL && dmd->flags & (CRYPT_ACTIVATE_IGNORE_CORRUPTION|
CRYPT_ACTIVATE_RESTART_ON_CORRUPTION|
CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS|
CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE) &&
!(dmt_flags & DM_VERITY_ON_CORRUPTION_SUPPORTED))
log_err(cd, _("Requested dm-verity data corruption handling options are not supported."));
if (r == -EINVAL && dmd->segment.type == DM_VERITY &&
dmd->segment.u.verity.fec_device && !(dmt_flags & DM_VERITY_FEC_SUPPORTED))
log_err(cd, _("Requested dm-verity FEC options are not supported."));
if (r == -EINVAL && dmd->segment.type == DM_CRYPT) {
if (dmd->segment.u.crypt.integrity && !(dmt_flags & DM_INTEGRITY_SUPPORTED))
log_err(cd, _("Requested data integrity options are not supported."));
if (dmd->segment.u.crypt.sector_size != SECTOR_SIZE && !(dmt_flags & DM_SECTOR_SIZE_SUPPORTED))
log_err(cd, _("Requested sector_size option is not supported."));
}
if (r == -EINVAL && dmd->segment.type == DM_INTEGRITY && (dmd->flags & CRYPT_ACTIVATE_RECALCULATE) &&
!(dmt_flags & DM_INTEGRITY_RECALC_SUPPORTED))
log_err(cd, _("Requested automatic recalculation of integrity tags is not supported."));
if (r == -EINVAL && dmd->segment.type == DM_INTEGRITY && (dmd->flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) &&
!(dmt_flags & DM_INTEGRITY_DISCARDS_SUPPORTED))
log_err(cd, _("Discard/TRIM is not supported."));
if (r == -EINVAL && dmd->segment.type == DM_INTEGRITY && (dmd->flags & CRYPT_ACTIVATE_NO_JOURNAL_BITMAP) &&
!(dmt_flags & DM_INTEGRITY_BITMAP_SUPPORTED))
log_err(cd, _("Requested dm-integrity bitmap mode is not supported."));
out:
dm_exit_context();
return r;
}
int dm_reload_device(struct crypt_device *cd, const char *name,
struct crypt_dm_active_device *dmd, uint32_t dmflags, unsigned resume)
{
int r;
uint32_t dmt_flags;
if (!dmd)
return -EINVAL;
if (dm_init_context(cd, dmd->segment.type))
return -ENOTSUP;
if (dm_flags(cd, DM_INTEGRITY, &dmt_flags) || !(dmt_flags & DM_INTEGRITY_RECALC_SUPPORTED))
dmd->flags &= ~CRYPT_ACTIVATE_RECALCULATE;
r = _dm_reload_device(cd, name, dmd);
if (r == -EINVAL && (dmd->segment.type == DM_CRYPT || dmd->segment.type == DM_LINEAR)) {
if ((dmd->flags & (CRYPT_ACTIVATE_SAME_CPU_CRYPT|CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS)) &&
!dm_flags(cd, DM_CRYPT, &dmt_flags) && !(dmt_flags & (DM_SAME_CPU_CRYPT_SUPPORTED|DM_SUBMIT_FROM_CRYPT_CPUS_SUPPORTED)))
log_err(cd, _("Requested dm-crypt performance options are not supported."));
if ((dmd->flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) &&
!dm_flags(cd, DM_CRYPT, &dmt_flags) && !(dmt_flags & DM_DISCARDS_SUPPORTED))
log_err(cd, _("Discard/TRIM is not supported."));
if ((dmd->flags & CRYPT_ACTIVATE_ALLOW_DISCARDS) &&
!dm_flags(cd, DM_INTEGRITY, &dmt_flags) && !(dmt_flags & DM_INTEGRITY_DISCARDS_SUPPORTED))
log_err(cd, _("Discard/TRIM is not supported."));
}
if (!r && resume)
r = _dm_resume_device(name, dmflags | act2dmflags(dmd->flags));
dm_exit_context();
return r;
}
static int dm_status_dmi(const char *name, struct dm_info *dmi,
const char *target, char **status_line)
{
struct dm_task *dmt;
uint64_t start, length;
char *target_type, *params = NULL;
int r = -EINVAL;
if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
goto out;
if (!dm_task_no_flush(dmt))
goto out;
if (!dm_task_set_name(dmt, name))
goto out;
if (!dm_task_run(dmt))
goto out;
if (!dm_task_get_info(dmt, dmi))
goto out;
if (!dmi->exists) {
r = -ENODEV;
goto out;
}
dm_get_next_target(dmt, NULL, &start, &length,
&target_type, ¶ms);
if (!target_type || start != 0)
goto out;
if (target && strcmp(target_type, target))
goto out;
/* for target == NULL check all supported */
if (!target && (strcmp(target_type, DM_CRYPT_TARGET) &&
strcmp(target_type, DM_VERITY_TARGET) &&
strcmp(target_type, DM_INTEGRITY_TARGET) &&
strcmp(target_type, DM_LINEAR_TARGET) &&
strcmp(target_type, DM_ZERO_TARGET) &&
strcmp(target_type, DM_ERROR_TARGET)))
goto out;
r = 0;
out:
if (!r && status_line && !(*status_line = strdup(params)))
r = -ENOMEM;
if (dmt)
dm_task_destroy(dmt);
return r;
}
int dm_status_device(struct crypt_device *cd, const char *name)
{
int r;
struct dm_info dmi;
struct stat st;
/* libdevmapper is too clever and handles
* path argument differently with error.
* Fail early here if parameter is non-existent path.
*/
if (strchr(name, '/') && stat(name, &st) < 0)
return -ENODEV;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
r = dm_status_dmi(name, &dmi, NULL, NULL);
dm_exit_context();
if (r < 0)
return r;
return (dmi.open_count > 0) ? 1 : 0;
}
int dm_status_suspended(struct crypt_device *cd, const char *name)
{
int r;
struct dm_info dmi;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
r = dm_status_dmi(name, &dmi, NULL, NULL);
dm_exit_context();
if (r < 0)
return r;
return dmi.suspended ? 1 : 0;
}
static int _dm_status_verity_ok(struct crypt_device *cd, const char *name)
{
int r;
struct dm_info dmi;
char *status_line = NULL;
r = dm_status_dmi(name, &dmi, DM_VERITY_TARGET, &status_line);
if (r < 0 || !status_line) {
free(status_line);
return r;
}
log_dbg(cd, "Verity volume %s status is %s.", name, status_line ?: "");
r = status_line[0] == 'V' ? 1 : 0;
free(status_line);
return r;
}
int dm_status_verity_ok(struct crypt_device *cd, const char *name)
{
int r;
if (dm_init_context(cd, DM_VERITY))
return -ENOTSUP;
r = _dm_status_verity_ok(cd, name);
dm_exit_context();
return r;
}
int dm_status_integrity_failures(struct crypt_device *cd, const char *name, uint64_t *count)
{
int r;
struct dm_info dmi;
char *status_line = NULL;
if (dm_init_context(cd, DM_INTEGRITY))
return -ENOTSUP;
r = dm_status_dmi(name, &dmi, DM_INTEGRITY_TARGET, &status_line);
if (r < 0 || !status_line) {
free(status_line);
dm_exit_context();
return r;
}
log_dbg(cd, "Integrity volume %s failure status is %s.", name, status_line ?: "");
*count = strtoull(status_line, NULL, 10);
free(status_line);
dm_exit_context();
return 0;
}
/* FIXME use hex wrapper, user val wrappers for line parsing */
static int _dm_target_query_crypt(struct crypt_device *cd, uint32_t get_flags,
char *params, struct dm_target *tgt,
uint32_t *act_flags)
{
uint64_t val64;
char *rcipher, *rintegrity, *key_, *rdevice, *endp, buffer[3], *arg, *key_desc;
unsigned int i, val;
int r;
size_t key_size;
struct device *data_device = NULL;
char *cipher = NULL, *integrity = NULL;
struct volume_key *vk = NULL;
tgt->type = DM_CRYPT;
tgt->direction = TARGET_QUERY;
tgt->u.crypt.sector_size = SECTOR_SIZE;
r = -EINVAL;
rcipher = strsep(¶ms, " ");
rintegrity = NULL;
/* skip */
key_ = strsep(¶ms, " ");
if (!params)
goto err;
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
params++;
tgt->u.crypt.iv_offset = val64;
/* device */
rdevice = strsep(¶ms, " ");
if (get_flags & DM_ACTIVE_DEVICE) {
arg = crypt_lookup_dev(rdevice);
r = device_alloc(cd, &data_device, arg);
free(arg);
if (r < 0 && r != -ENOTBLK)
goto err;
}
r = -EINVAL;
/*offset */
if (!params)
goto err;
val64 = strtoull(params, ¶ms, 10);
tgt->u.crypt.offset = val64;
tgt->u.crypt.tag_size = 0;
/* Features section, available since crypt target version 1.11 */
if (*params) {
if (*params != ' ')
goto err;
params++;
/* Number of arguments */
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
params++;
for (i = 0; i < val64; i++) {
if (!params)
goto err;
arg = strsep(¶ms, " ");
if (!strcasecmp(arg, "allow_discards"))
*act_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
else if (!strcasecmp(arg, "same_cpu_crypt"))
*act_flags |= CRYPT_ACTIVATE_SAME_CPU_CRYPT;
else if (!strcasecmp(arg, "submit_from_crypt_cpus"))
*act_flags |= CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS;
else if (!strcasecmp(arg, "iv_large_sectors"))
*act_flags |= CRYPT_ACTIVATE_IV_LARGE_SECTORS;
else if (sscanf(arg, "integrity:%u:", &val) == 1) {
tgt->u.crypt.tag_size = val;
rintegrity = strchr(arg + strlen("integrity:"), ':');
if (!rintegrity)
goto err;
rintegrity++;
} else if (sscanf(arg, "sector_size:%u", &val) == 1) {
tgt->u.crypt.sector_size = val;
} else /* unknown option */
goto err;
}
/* All parameters should be processed */
if (params)
goto err;
}
/* cipher */
if (get_flags & DM_ACTIVE_CRYPT_CIPHER) {
r = cipher_dm2c(CONST_CAST(char**)&cipher,
CONST_CAST(char**)&integrity,
rcipher, rintegrity);
if (r < 0)
goto err;
}
r = -EINVAL;
if (key_[0] == ':')
*act_flags |= CRYPT_ACTIVATE_KEYRING_KEY;
if (get_flags & DM_ACTIVE_CRYPT_KEYSIZE) {
/* we will trust kernel the key_string is in expected format */
if (key_[0] == ':') {
if (sscanf(key_ + 1, "%zu", &key_size) != 1)
goto err;
} else
key_size = strlen(key_) / 2;
vk = crypt_alloc_volume_key(key_size, NULL);
if (!vk) {
r = -ENOMEM;
goto err;
}
if (get_flags & DM_ACTIVE_CRYPT_KEY) {
if (key_[0] == ':') {
/* :<key_size>:<key_type>:<key_description> */
key_desc = NULL;
endp = strpbrk(key_ + 1, ":");
if (endp)
key_desc = strpbrk(endp + 1, ":");
if (!key_desc) {
r = -ENOMEM;
goto err;
}
key_desc++;
crypt_volume_key_set_description(vk, key_desc);
} else {
buffer[2] = '\0';
for(i = 0; i < vk->keylength; i++) {
memcpy(buffer, &key_[i * 2], 2);
vk->key[i] = strtoul(buffer, &endp, 16);
if (endp != &buffer[2]) {
r = -EINVAL;
goto err;
}
}
}
}
}
memset(key_, 0, strlen(key_));
if (cipher)
tgt->u.crypt.cipher = cipher;
if (integrity)
tgt->u.crypt.integrity = integrity;
if (data_device)
tgt->data_device = data_device;
if (vk)
tgt->u.crypt.vk = vk;
return 0;
err:
free(cipher);
free(integrity);
device_free(cd, data_device);
crypt_free_volume_key(vk);
return r;
}
static int _dm_target_query_verity(struct crypt_device *cd,
uint32_t get_flags,
char *params,
struct dm_target *tgt,
uint32_t *act_flags)
{
struct crypt_params_verity *vp = NULL;
uint32_t val32;
uint64_t val64;
ssize_t len;
char *str, *str2, *arg;
unsigned int i, features;
int r;
struct device *data_device = NULL, *hash_device = NULL, *fec_device = NULL;
char *hash_name = NULL, *root_hash = NULL, *salt = NULL, *fec_dev_str = NULL;
char *root_hash_sig_key_desc = NULL;
if (get_flags & DM_ACTIVE_VERITY_PARAMS) {
vp = crypt_zalloc(sizeof(*vp));
if (!vp)
return -ENOMEM;
}
tgt->type = DM_VERITY;
tgt->direction = TARGET_QUERY;
tgt->u.verity.vp = vp;
/* version */
val32 = strtoul(params, ¶ms, 10);
if (*params != ' ')
return -EINVAL;
if (vp)
vp->hash_type = val32;
params++;
/* data device */
str = strsep(¶ms, " ");
if (!params)
return -EINVAL;
if (get_flags & DM_ACTIVE_DEVICE) {
str2 = crypt_lookup_dev(str);
r = device_alloc(cd, &data_device, str2);
free(str2);
if (r < 0 && r != -ENOTBLK)
return r;
}
r = -EINVAL;
/* hash device */
str = strsep(¶ms, " ");
if (!params)
goto err;
if (get_flags & DM_ACTIVE_VERITY_HASH_DEVICE) {
str2 = crypt_lookup_dev(str);
r = device_alloc(cd, &hash_device, str2);
free(str2);
if (r < 0 && r != -ENOTBLK)
goto err;
}
r = -EINVAL;
/* data block size*/
val32 = strtoul(params, ¶ms, 10);
if (*params != ' ')
goto err;
if (vp)
vp->data_block_size = val32;
params++;
/* hash block size */
val32 = strtoul(params, ¶ms, 10);
if (*params != ' ')
goto err;
if (vp)
vp->hash_block_size = val32;
params++;
/* data blocks */
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
if (vp)
vp->data_size = val64;
params++;
/* hash start */
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
tgt->u.verity.hash_offset = val64;
params++;
/* hash algorithm */
str = strsep(¶ms, " ");
if (!params)
goto err;
if (vp) {
hash_name = strdup(str);
if (!hash_name) {
r = -ENOMEM;
goto err;
}
}
/* root digest */
str = strsep(¶ms, " ");
if (!params)
goto err;
len = crypt_hex_to_bytes(str, &str2, 0);
if (len < 0) {
r = len;
goto err;
}
tgt->u.verity.root_hash_size = len;
if (get_flags & DM_ACTIVE_VERITY_ROOT_HASH)
root_hash = str2;
else
free(str2);
/* salt */
str = strsep(¶ms, " ");
if (vp) {
if (!strcmp(str, "-")) {
vp->salt_size = 0;
vp->salt = NULL;
} else {
len = crypt_hex_to_bytes(str, &str2, 0);
if (len < 0) {
r = len;
goto err;
}
vp->salt_size = len;
salt = str2;
}
}
r = -EINVAL;
/* Features section, available since verity target version 1.3 */
if (params) {
/* Number of arguments */
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
params++;
features = (int)val64;
for (i = 0; i < features; i++) {
r = -EINVAL;
if (!params)
goto err;
arg = strsep(¶ms, " ");
if (!strcasecmp(arg, "ignore_corruption"))
*act_flags |= CRYPT_ACTIVATE_IGNORE_CORRUPTION;
else if (!strcasecmp(arg, "restart_on_corruption"))
*act_flags |= CRYPT_ACTIVATE_RESTART_ON_CORRUPTION;
else if (!strcasecmp(arg, "ignore_zero_blocks"))
*act_flags |= CRYPT_ACTIVATE_IGNORE_ZERO_BLOCKS;
else if (!strcasecmp(arg, "check_at_most_once"))
*act_flags |= CRYPT_ACTIVATE_CHECK_AT_MOST_ONCE;
else if (!strcasecmp(arg, "use_fec_from_device")) {
str = strsep(¶ms, " ");
str2 = crypt_lookup_dev(str);
if (get_flags & DM_ACTIVE_VERITY_HASH_DEVICE) {
r = device_alloc(cd, &fec_device, str2);
if (r < 0 && r != -ENOTBLK) {
free(str2);
goto err;
}
}
if (vp) {
free(fec_dev_str);
fec_dev_str = str2;
} else
free(str2);
i++;
} else if (!strcasecmp(arg, "fec_start")) {
val64 = strtoull(params, ¶ms, 10);
if (*params)
params++;
tgt->u.verity.fec_offset = val64;
if (vp)
vp->fec_area_offset = val64 * vp->hash_block_size;
i++;
} else if (!strcasecmp(arg, "fec_blocks")) {
val64 = strtoull(params, ¶ms, 10);
if (*params)
params++;
tgt->u.verity.fec_blocks = val64;
i++;
} else if (!strcasecmp(arg, "fec_roots")) {
val32 = strtoul(params, ¶ms, 10);
if (*params)
params++;
if (vp)
vp->fec_roots = val32;
i++;
} else if (!strcasecmp(arg, "root_hash_sig_key_desc")) {
str = strsep(¶ms, " ");
if (!str)
goto err;
if (!root_hash_sig_key_desc)
root_hash_sig_key_desc = strdup(str);
i++;
if (vp)
vp->flags |= CRYPT_VERITY_ROOT_HASH_SIGNATURE;
} else /* unknown option */
goto err;
}
/* All parameters should be processed */
if (params && *params) {
r = -EINVAL;
goto err;
}
}
if (data_device)
tgt->data_device = data_device;
if (hash_device)
tgt->u.verity.hash_device = hash_device;
if (fec_device)
tgt->u.verity.fec_device = fec_device;
if (root_hash)
tgt->u.verity.root_hash = root_hash;
if (vp && hash_name)
vp->hash_name = hash_name;
if (vp && salt)
vp->salt = salt;
if (vp && fec_dev_str)
vp->fec_device = fec_dev_str;
if (root_hash_sig_key_desc)
tgt->u.verity.root_hash_sig_key_desc = root_hash_sig_key_desc;
return 0;
err:
device_free(cd, data_device);
device_free(cd, hash_device);
device_free(cd, fec_device);
free(root_hash_sig_key_desc);
free(root_hash);
free(hash_name);
free(salt);
free(fec_dev_str);
free(vp);
return r;
}
static int _dm_target_query_integrity(struct crypt_device *cd,
uint32_t get_flags,
char *params,
struct dm_target *tgt,
uint32_t *act_flags)
{
uint32_t val32;
uint64_t val64;
char c, *str, *str2, *arg;
unsigned int i, features, val;
ssize_t len;
int r;
struct device *data_device = NULL, *meta_device = NULL;
char *integrity = NULL, *journal_crypt = NULL, *journal_integrity = NULL;
struct volume_key *vk = NULL;
tgt->type = DM_INTEGRITY;
tgt->direction = TARGET_QUERY;
/* data device */
str = strsep(¶ms, " ");
if (get_flags & DM_ACTIVE_DEVICE) {
str2 = crypt_lookup_dev(str);
r = device_alloc(cd, &data_device, str2);
free(str2);
if (r < 0 && r != -ENOTBLK)
return r;
}
r = -EINVAL;
/*offset */
if (!params)
goto err;
val64 = strtoull(params, ¶ms, 10);
if (!*params || *params != ' ')
goto err;
tgt->u.integrity.offset = val64;
/* tag size*/
val32 = strtoul(params, ¶ms, 10);
tgt->u.integrity.tag_size = val32;
if (!*params || *params != ' ')
goto err;
/* journal */
c = toupper(*(++params));
if (!*params || *(++params) != ' ' || (c != 'D' && c != 'J' && c != 'R' && c != 'B'))
goto err;
if (c == 'D')
*act_flags |= CRYPT_ACTIVATE_NO_JOURNAL;
if (c == 'R')
*act_flags |= CRYPT_ACTIVATE_RECOVERY;
if (c == 'B') {
*act_flags |= CRYPT_ACTIVATE_NO_JOURNAL;
*act_flags |= CRYPT_ACTIVATE_NO_JOURNAL_BITMAP;
}
tgt->u.integrity.sector_size = SECTOR_SIZE;
/* Features section */
if (params) {
/* Number of arguments */
val64 = strtoull(params, ¶ms, 10);
if (*params != ' ')
goto err;
params++;
features = (int)val64;
for (i = 0; i < features; i++) {
r = -EINVAL;
if (!params)
goto err;
arg = strsep(¶ms, " ");
if (sscanf(arg, "journal_sectors:%u", &val) == 1)
tgt->u.integrity.journal_size = val * SECTOR_SIZE;
else if (sscanf(arg, "journal_watermark:%u", &val) == 1)
tgt->u.integrity.journal_watermark = val;
else if (sscanf(arg, "sectors_per_bit:%" PRIu64, &val64) == 1) {
if (val64 > UINT_MAX)
goto err;
/* overloaded value for bitmap mode */
tgt->u.integrity.journal_watermark = (unsigned int)val64;
} else if (sscanf(arg, "commit_time:%u", &val) == 1)
tgt->u.integrity.journal_commit_time = val;
else if (sscanf(arg, "bitmap_flush_interval:%u", &val) == 1)
/* overloaded value for bitmap mode */
tgt->u.integrity.journal_commit_time = val;
else if (sscanf(arg, "interleave_sectors:%u", &val) == 1)
tgt->u.integrity.interleave_sectors = val;
else if (sscanf(arg, "block_size:%u", &val) == 1)
tgt->u.integrity.sector_size = val;
else if (sscanf(arg, "buffer_sectors:%u", &val) == 1)
tgt->u.integrity.buffer_sectors = val;
else if (!strncmp(arg, "internal_hash:", 14) && !integrity) {
str = &arg[14];
arg = strsep(&str, ":");
if (get_flags & DM_ACTIVE_INTEGRITY_PARAMS) {
integrity = strdup(arg);
if (!integrity) {
r = -ENOMEM;
goto err;
}
}
if (str) {
len = crypt_hex_to_bytes(str, &str2, 1);
if (len < 0) {
r = len;
goto err;
}
r = 0;
if (get_flags & DM_ACTIVE_CRYPT_KEY) {
vk = crypt_alloc_volume_key(len, str2);
if (!vk)
r = -ENOMEM;
} else if (get_flags & DM_ACTIVE_CRYPT_KEYSIZE) {
vk = crypt_alloc_volume_key(len, NULL);
if (!vk)
r = -ENOMEM;
}
crypt_safe_free(str2);
if (r < 0)
goto err;
}
} else if (!strncmp(arg, "meta_device:", 12) && !meta_device) {
if (get_flags & DM_ACTIVE_DEVICE) {
str = crypt_lookup_dev(&arg[12]);
r = device_alloc(cd, &meta_device, str);
free(str);
if (r < 0 && r != -ENOTBLK)
goto err;
}
} else if (!strncmp(arg, "journal_crypt:", 14) && !journal_crypt) {
str = &arg[14];
arg = strsep(&str, ":");
if (get_flags & DM_ACTIVE_INTEGRITY_PARAMS) {
journal_crypt = strdup(arg);
if (!journal_crypt) {
r = -ENOMEM;
goto err;
}
}
} else if (!strncmp(arg, "journal_mac:", 12) && !journal_integrity) {
str = &arg[12];
arg = strsep(&str, ":");
if (get_flags & DM_ACTIVE_INTEGRITY_PARAMS) {
journal_integrity = strdup(arg);
if (!journal_integrity) {
r = -ENOMEM;
goto err;
}
}
} else if (!strcmp(arg, "recalculate")) {
*act_flags |= CRYPT_ACTIVATE_RECALCULATE;
} else if (!strcmp(arg, "fix_padding")) {
tgt->u.integrity.fix_padding = true;
} else if (!strcmp(arg, "allow_discards")) {
*act_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
} else /* unknown option */
goto err;
}
/* All parameters should be processed */
if (params && *params) {
r = -EINVAL;
goto err;
}
}
if (data_device)
tgt->data_device = data_device;
if (meta_device)
tgt->u.integrity.meta_device = meta_device;
if (integrity)
tgt->u.integrity.integrity = integrity;
if (journal_crypt)
tgt->u.integrity.journal_crypt = journal_crypt;
if (journal_integrity)
tgt->u.integrity.journal_integrity = journal_integrity;
if (vk)
tgt->u.integrity.vk = vk;
return 0;
err:
device_free(cd, data_device);
device_free(cd, meta_device);
free(integrity);
free(journal_crypt);
free(journal_integrity);
crypt_free_volume_key(vk);
return r;
}
static int _dm_target_query_linear(struct crypt_device *cd, struct dm_target *tgt,
uint32_t get_flags, char *params)
{
uint64_t val64;
char *rdevice, *arg;
int r;
struct device *device = NULL;
/* device */
rdevice = strsep(¶ms, " ");
if (get_flags & DM_ACTIVE_DEVICE) {
arg = crypt_lookup_dev(rdevice);
r = device_alloc(cd, &device, arg);
free(arg);
if (r < 0 && r != -ENOTBLK)
return r;
}
r = -EINVAL;
/*offset */
if (!params)
goto err;
val64 = strtoull(params, ¶ms, 10);
/* params should be empty now */
if (*params)
goto err;
tgt->type = DM_LINEAR;
tgt->direction = TARGET_QUERY;
tgt->data_device = device;
tgt->u.linear.offset = val64;
return 0;
err:
device_free(cd, device);
return r;
}
static int _dm_target_query_error(struct crypt_device *cd, struct dm_target *tgt)
{
tgt->type = DM_ERROR;
tgt->direction = TARGET_QUERY;
return 0;
}
static int _dm_target_query_zero(struct crypt_device *cd, struct dm_target *tgt)
{
tgt->type = DM_ZERO;
tgt->direction = TARGET_QUERY;
return 0;
}
/*
* on error retval has to be negative
*
* also currently any _dm_target_query fn does not perform cleanup on error
*/
static int dm_target_query(struct crypt_device *cd, struct dm_target *tgt, const uint64_t *start,
const uint64_t *length, const char *target_type,
char *params, uint32_t get_flags, uint32_t *act_flags)
{
int r = -ENOTSUP;
if (!strcmp(target_type, DM_CRYPT_TARGET))
r = _dm_target_query_crypt(cd, get_flags, params, tgt, act_flags);
else if (!strcmp(target_type, DM_VERITY_TARGET))
r = _dm_target_query_verity(cd, get_flags, params, tgt, act_flags);
else if (!strcmp(target_type, DM_INTEGRITY_TARGET))
r = _dm_target_query_integrity(cd, get_flags, params, tgt, act_flags);
else if (!strcmp(target_type, DM_LINEAR_TARGET))
r = _dm_target_query_linear(cd, tgt, get_flags, params);
else if (!strcmp(target_type, DM_ERROR_TARGET))
r = _dm_target_query_error(cd, tgt);
else if (!strcmp(target_type, DM_ZERO_TARGET))
r = _dm_target_query_zero(cd, tgt);
if (!r) {
tgt->offset = *start;
tgt->size = *length;
}
return r;
}
static int _dm_query_device(struct crypt_device *cd, const char *name,
uint32_t get_flags, struct crypt_dm_active_device *dmd)
{
struct dm_target *t;
struct dm_task *dmt;
struct dm_info dmi;
uint64_t start, length;
char *target_type, *params;
const char *tmp_uuid;
void *next = NULL;
int r = -EINVAL;
t = &dmd->segment;
if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
return r;
if (!dm_task_secure_data(dmt))
goto out;
if (!dm_task_set_name(dmt, name))
goto out;
r = -ENODEV;
if (!dm_task_run(dmt))
goto out;
r = -EINVAL;
if (!dm_task_get_info(dmt, &dmi))
goto out;
if (!dmi.exists) {
r = -ENODEV;
goto out;
}
if (dmi.target_count <= 0) {
r = -EINVAL;
goto out;
}
/* Never allow to return empty key */
if ((get_flags & DM_ACTIVE_CRYPT_KEY) && dmi.suspended) {
log_dbg(cd, "Cannot read volume key while suspended.");
r = -EINVAL;
goto out;
}
r = dm_targets_allocate(&dmd->segment, dmi.target_count);
if (r)
goto out;
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, ¶ms);
r = dm_target_query(cd, t, &start, &length, target_type, params, get_flags, &dmd->flags);
if (!r && t->type == DM_VERITY) {
r = _dm_status_verity_ok(cd, name);
if (r == 0)
dmd->flags |= CRYPT_ACTIVATE_CORRUPTED;
}
if (r < 0) {
if (r != -ENOTSUP)
log_err(cd, _("Failed to query dm-%s segment."), target_type);
goto out;
}
dmd->size += length;
t = t->next;
} while (next && t);
if (dmi.read_only)
dmd->flags |= CRYPT_ACTIVATE_READONLY;
if (dmi.suspended)
dmd->flags |= CRYPT_ACTIVATE_SUSPENDED;
tmp_uuid = dm_task_get_uuid(dmt);
if (!tmp_uuid)
dmd->flags |= CRYPT_ACTIVATE_NO_UUID;
else if (get_flags & DM_ACTIVE_UUID) {
if (!strncmp(tmp_uuid, DM_UUID_PREFIX, DM_UUID_PREFIX_LEN))
dmd->uuid = strdup(tmp_uuid + DM_UUID_PREFIX_LEN);
}
dmd->holders = 0;
#if (HAVE_DECL_DM_DEVICE_HAS_HOLDERS && HAVE_DECL_DM_DEVICE_HAS_MOUNTED_FS)
if (get_flags & DM_ACTIVE_HOLDERS)
dmd->holders = (dm_device_has_mounted_fs(dmi.major, dmi.minor) ||
dm_device_has_holders(dmi.major, dmi.minor));
#endif
r = (dmi.open_count > 0);
out:
if (dmt)
dm_task_destroy(dmt);
if (r < 0)
dm_targets_free(cd, dmd);
return r;
}
int dm_query_device(struct crypt_device *cd, const char *name,
uint32_t get_flags, struct crypt_dm_active_device *dmd)
{
int r;
if (!dmd)
return -EINVAL;
memset(dmd, 0, sizeof(*dmd));
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
r = _dm_query_device(cd, name, get_flags, dmd);
dm_exit_context();
return r;
}
static int _process_deps(struct crypt_device *cd, const char *prefix, struct dm_deps *deps, char **names, size_t names_offset, size_t names_length)
{
#if HAVE_DECL_DM_DEVICE_GET_NAME
struct crypt_dm_active_device dmd;
char dmname[PATH_MAX];
unsigned i;
int r, major, minor, count = 0;
if (!prefix || !deps)
return -EINVAL;
for (i = 0; i < deps->count; i++) {
major = major(deps->device[i]);
if (!dm_is_dm_major(major))
continue;
minor = minor(deps->device[i]);
if (!dm_device_get_name(major, minor, 0, dmname, PATH_MAX))
return -EINVAL;
memset(&dmd, 0, sizeof(dmd));
r = _dm_query_device(cd, dmname, DM_ACTIVE_UUID, &dmd);
if (r < 0)
continue;
if (!dmd.uuid ||
strncmp(prefix, dmd.uuid, strlen(prefix)) ||
crypt_string_in(dmname, names, names_length))
*dmname = '\0';
dm_targets_free(cd, &dmd);
free(CONST_CAST(void*)dmd.uuid);
if ((size_t)count >= (names_length - names_offset))
return -ENOMEM;
if (*dmname && !(names[names_offset + count++] = strdup(dmname)))
return -ENOMEM;
}
return count;
#else
return -EINVAL;
#endif
}
int dm_device_deps(struct crypt_device *cd, const char *name, const char *prefix, char **names, size_t names_length)
{
struct dm_task *dmt;
struct dm_info dmi;
struct dm_deps *deps;
int r = -EINVAL;
size_t i, last = 0, offset = 0;
if (!name || !names_length || !names)
return -EINVAL;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
while (name) {
if (!(dmt = dm_task_create(DM_DEVICE_DEPS)))
goto out;
if (!dm_task_set_name(dmt, name))
goto out;
r = -ENODEV;
if (!dm_task_run(dmt))
goto out;
r = -EINVAL;
if (!dm_task_get_info(dmt, &dmi))
goto out;
if (!(deps = dm_task_get_deps(dmt)))
goto out;
r = -ENODEV;
if (!dmi.exists)
goto out;
r = _process_deps(cd, prefix, deps, names, offset, names_length - 1);
if (r < 0)
goto out;
dm_task_destroy(dmt);
dmt = NULL;
offset += r;
name = names[last++];
}
r = 0;
out:
if (r < 0) {
for (i = 0; i < names_length - 1; i++)
free(names[i]);
*names = NULL;
}
if (dmt)
dm_task_destroy(dmt);
dm_exit_context();
return r;
}
static int _dm_message(const char *name, const char *msg)
{
int r = 0;
struct dm_task *dmt;
if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
return 0;
if (!dm_task_secure_data(dmt))
goto out;
if (name && !dm_task_set_name(dmt, name))
goto out;
if (!dm_task_set_sector(dmt, (uint64_t) 0))
goto out;
if (!dm_task_set_message(dmt, msg))
goto out;
r = dm_task_run(dmt);
out:
dm_task_destroy(dmt);
return r;
}
int dm_suspend_device(struct crypt_device *cd, const char *name, uint32_t dmflags)
{
uint32_t dmt_flags;
int r = -ENOTSUP;
if (dm_init_context(cd, DM_UNKNOWN))
return r;
if (dmflags & DM_SUSPEND_WIPE_KEY) {
if (dm_flags(cd, DM_CRYPT, &dmt_flags))
goto out;
if (!(dmt_flags & DM_KEY_WIPE_SUPPORTED))
goto out;
}
r = -EINVAL;
if (!_dm_simple(DM_DEVICE_SUSPEND, name, dmflags))
goto out;
if (dmflags & DM_SUSPEND_WIPE_KEY) {
if (!_dm_message(name, "key wipe")) {
_dm_resume_device(name, 0);
goto out;
}
}
r = 0;
out:
dm_exit_context();
return r;
}
int dm_resume_device(struct crypt_device *cd, const char *name, uint32_t dmflags)
{
int r;
if (dm_init_context(cd, DM_UNKNOWN))
return -ENOTSUP;
r = _dm_resume_device(name, dmflags);
dm_exit_context();
return r;
}
int dm_resume_and_reinstate_key(struct crypt_device *cd, const char *name,
const struct volume_key *vk)
{
uint32_t dmt_flags;
int msg_size;
char *msg = NULL;
int r = -ENOTSUP;
if (dm_init_context(cd, DM_CRYPT) || dm_flags(cd, DM_CRYPT, &dmt_flags))
return -ENOTSUP;
if (!(dmt_flags & DM_KEY_WIPE_SUPPORTED))
goto out;
if (vk->key_description)
msg_size = strlen(vk->key_description) + int_log10(vk->keylength) + 18;
else
msg_size = vk->keylength * 2 + 10; // key set <key>
msg = crypt_safe_alloc(msg_size);
if (!msg) {
r = -ENOMEM;
goto out;
}
strcpy(msg, "key set ");
if (vk->key_description)
snprintf(msg + 8, msg_size - 8, ":%zu:logon:%s", vk->keylength, vk->key_description);
else
hex_key(&msg[8], vk->keylength, vk->key);
if (!_dm_message(name, msg) ||
_dm_resume_device(name, 0)) {
r = -EINVAL;
goto out;
}
r = 0;
out:
crypt_safe_free(msg);
dm_exit_context();
return r;
}
const char *dm_get_dir(void)
{
return dm_dir();
}
int dm_is_dm_device(int major)
{
return dm_is_dm_major((uint32_t)major);
}
int dm_is_dm_kernel_name(const char *name)
{
return strncmp(name, "dm-", 3) ? 0 : 1;
}
int dm_crypt_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size,
struct device *data_device, struct volume_key *vk, const char *cipher,
uint64_t iv_offset, uint64_t data_offset, const char *integrity, uint32_t tag_size,
uint32_t sector_size)
{
int r = -EINVAL;
/* free on error */
char *dm_integrity = NULL;
if (tag_size) {
/* Space for IV metadata only */
dm_integrity = strdup(integrity ?: "none");
if (!dm_integrity) {
r = -ENOMEM;
goto err;
}
}
tgt->data_device = data_device;
tgt->type = DM_CRYPT;
tgt->direction = TARGET_SET;
tgt->u.crypt.vk = vk;
tgt->offset = seg_offset;
tgt->size = seg_size;
tgt->u.crypt.cipher = cipher;
tgt->u.crypt.integrity = dm_integrity;
tgt->u.crypt.iv_offset = iv_offset;
tgt->u.crypt.offset = data_offset;
tgt->u.crypt.tag_size = tag_size;
tgt->u.crypt.sector_size = sector_size;
return 0;
err:
free(dm_integrity);
return r;
}
int dm_verity_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size,
struct device *data_device, struct device *hash_device, struct device *fec_device,
const char *root_hash, uint32_t root_hash_size, const char *root_hash_sig_key_desc,
uint64_t hash_offset_block, uint64_t hash_blocks, struct crypt_params_verity *vp)
{
if (!data_device || !hash_device || !vp)
return -EINVAL;
tgt->type = DM_VERITY;
tgt->direction = TARGET_SET;
tgt->offset = seg_offset;
tgt->size = seg_size;
tgt->data_device = data_device;
tgt->u.verity.hash_device = hash_device;
tgt->u.verity.fec_device = fec_device;
tgt->u.verity.root_hash = root_hash;
tgt->u.verity.root_hash_size = root_hash_size;
tgt->u.verity.root_hash_sig_key_desc = root_hash_sig_key_desc;
tgt->u.verity.hash_offset = hash_offset_block;
tgt->u.verity.fec_offset = vp->fec_area_offset / vp->hash_block_size;
tgt->u.verity.hash_blocks = hash_blocks;
tgt->u.verity.vp = vp;
return 0;
}
int dm_integrity_target_set(struct crypt_device *cd,
struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size,
struct device *meta_device,
struct device *data_device, uint64_t tag_size, uint64_t offset,
uint32_t sector_size, struct volume_key *vk,
struct volume_key *journal_crypt_key, struct volume_key *journal_mac_key,
const struct crypt_params_integrity *ip)
{
uint32_t dmi_flags;
if (!data_device)
return -EINVAL;
_dm_check_versions(cd, DM_INTEGRITY);
tgt->type = DM_INTEGRITY;
tgt->direction = TARGET_SET;
tgt->offset = seg_offset;
tgt->size = seg_size;
tgt->data_device = data_device;
if (meta_device != data_device)
tgt->u.integrity.meta_device = meta_device;
tgt->u.integrity.tag_size = tag_size;
tgt->u.integrity.offset = offset;
tgt->u.integrity.sector_size = sector_size;
tgt->u.integrity.vk = vk;
tgt->u.integrity.journal_crypt_key = journal_crypt_key;
tgt->u.integrity.journal_integrity_key = journal_mac_key;
if (!dm_flags(cd, DM_INTEGRITY, &dmi_flags) &&
(dmi_flags & DM_INTEGRITY_FIX_PADDING_SUPPORTED) &&
!(crypt_get_compatibility(cd) & CRYPT_COMPAT_LEGACY_INTEGRITY_PADDING))
tgt->u.integrity.fix_padding = true;
if (ip) {
tgt->u.integrity.journal_size = ip->journal_size;
tgt->u.integrity.journal_watermark = ip->journal_watermark;
tgt->u.integrity.journal_commit_time = ip->journal_commit_time;
tgt->u.integrity.interleave_sectors = ip->interleave_sectors;
tgt->u.integrity.buffer_sectors = ip->buffer_sectors;
tgt->u.integrity.journal_integrity = ip->journal_integrity;
tgt->u.integrity.journal_crypt = ip->journal_crypt;
tgt->u.integrity.integrity = ip->integrity;
}
return 0;
}
int dm_linear_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size,
struct device *data_device, uint64_t data_offset)
{
if (!data_device)
return -EINVAL;
tgt->type = DM_LINEAR;
tgt->direction = TARGET_SET;
tgt->offset = seg_offset;
tgt->size = seg_size;
tgt->data_device = data_device;
tgt->u.linear.offset = data_offset;
return 0;
}
int dm_zero_target_set(struct dm_target *tgt, uint64_t seg_offset, uint64_t seg_size)
{
tgt->type = DM_ZERO;
tgt->direction = TARGET_SET;
tgt->offset = seg_offset;
tgt->size = seg_size;
return 0;
}