* Copyright (C) 2004, Christophe Saout <christophe@saout.de>
* Copyright (C) 2004-2007, Clemens Fruhwirth <clemens@endorphin.org>
* Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2012, Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * 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
/* Set if dm-crypt version was probed */
static int _dm_crypt_checked = 0;
+static int _quiet_log = 0;
static uint32_t _dm_crypt_flags = 0;
-static int _dm_use_count = 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
va_start(va, f);
if (vasprintf(&msg, f, va) > 0) {
- if (level < 4) {
+ if (level < 4 && !_quiet_log) {
log_err(_context, msg);
log_err(_context, "\n");
- } else
- log_dbg(msg);
+ } else {
+ /* We do not use DM visual stack backtrace here */
+ if (strncmp(msg, "<backtrace>", 11))
+ log_dbg(msg);
+ }
}
free(msg);
va_end(va);
struct dm_task *dmt;
struct dm_versions *target, *last_target;
char dm_version[16];
+ int r = 0;
if (_dm_crypt_checked)
return 1;
+ /* Shut up DM while checking */
+ _quiet_log = 1;
+
/* FIXME: add support to DM so it forces crypt target module load here */
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
- return 0;
+ goto out;
- if (!dm_task_run(dmt)) {
- dm_task_destroy(dmt);
- return 0;
- }
+ if (!dm_task_run(dmt))
+ goto out;
- if (!dm_task_get_driver_version(dmt, dm_version, sizeof(dm_version))) {
- dm_task_destroy(dmt);
- return 0;
- }
+ if (!dm_task_get_driver_version(dmt, dm_version, sizeof(dm_version)))
+ goto out;
target = dm_task_get_versions(dmt);
do {
target = (struct dm_versions *)((char *) target + target->next);
} while (last_target != target);
- dm_task_destroy(dmt);
- return 1;
+ r = 1;
+ log_dbg("Device-mapper backend running with UDEV support %sabled.",
+ _dm_use_udev() ? "en" : "dis");
+out:
+ if (dmt)
+ dm_task_destroy(dmt);
+
+ _quiet_log = 0;
+ return r;
}
uint32_t dm_flags(void)
{
- if (!_dm_crypt_checked)
- _dm_check_versions();
-
+ _dm_check_versions();
return _dm_crypt_flags;
}
-int dm_init(struct crypt_device *context, int check_kernel)
+/* This doesn't run any kernel checks, just set up userspace libdevmapper */
+void dm_backend_init(void)
{
if (!_dm_use_count++) {
- log_dbg("Initialising device-mapper backend%s, UDEV is %sabled.",
- check_kernel ? "" : " (NO kernel check requested)",
- _dm_use_udev() ? "en" : "dis");
- if (check_kernel && !_dm_check_versions()) {
- log_err(context, _("Cannot initialize device-mapper. Is dm_mod kernel module loaded?\n"));
- return -1;
- }
- if (getuid() || geteuid())
- log_dbg(("WARNING: Running as a non-root user. Functionality may be unavailable."));
+ log_dbg("Initialising device-mapper backend library.");
dm_log_init(set_dm_error);
dm_log_init_verbose(10);
}
-
- // FIXME: global context is not safe
- if (context)
- _context = context;
-
- return 1; /* unsafe memory */
}
-void dm_exit(void)
+void dm_backend_exit(void)
{
if (_dm_use_count && (!--_dm_use_count)) {
log_dbg("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)
+{
+ _context = cd;
+ if (!_dm_check_versions()) {
+ if (getuid() || geteuid())
+ log_err(cd, _("Cannot initialize device-mapper, "
+ "running as non-root user.\n"));
+ else
+ log_err(cd, _("Cannot initialize device-mapper. "
+ "Is dm_mod kernel module loaded?\n"));
_context = NULL;
+ return -ENOTSUP;
}
+ return 0;
+}
+static void dm_exit_context(void)
+{
+ _context = NULL;
}
/* Return path to DM device */
sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
}
-static size_t hex_to_bytes(const char *hex, char *result)
-{
- char buf[3] = "xx\0", *endp;
- size_t i, len;
-
- len = strlen(hex) / 2;
- for (i = 0; i < len; i++) {
- memcpy(buf, &hex[i * 2], 2);
- result[i] = strtoul(buf, &endp, 16);
- if (endp != &buf[2])
- return -EINVAL;
- }
- return i;
-}
-
/* http://code.google.com/p/cryptsetup/wiki/DMCrypt */
static char *get_dm_crypt_params(struct crypt_dm_active_device *dmd)
{
hex_key(hexkey, dmd->u.crypt.vk->keylength, dmd->u.crypt.vk->key);
max_size = strlen(hexkey) + strlen(dmd->u.crypt.cipher) +
- strlen(dmd->data_device) + strlen(features) + 64;
+ strlen(device_block_path(dmd->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",
dmd->u.crypt.cipher, hexkey, dmd->u.crypt.iv_offset,
- dmd->data_device, dmd->u.crypt.offset, features);
+ device_block_path(dmd->data_device), dmd->u.crypt.offset,
+ features);
if (r < 0 || r >= max_size) {
crypt_safe_free(params);
params = NULL;
strncpy(hexsalt, "-", 2);
max_size = strlen(hexroot) + strlen(hexsalt) +
- strlen(dmd->data_device) +
- strlen(dmd->u.verity.hash_device) +
+ strlen(device_block_path(dmd->data_device)) +
+ strlen(device_block_path(dmd->u.verity.hash_device)) +
strlen(vp->hash_name) + 128;
params = crypt_safe_alloc(max_size);
r = snprintf(params, max_size,
"%u %s %s %u %u %" PRIu64 " %" PRIu64 " %s %s %s",
- vp->hash_type, dmd->data_device,
- dmd->u.verity.hash_device,
+ vp->hash_type, device_block_path(dmd->data_device),
+ device_block_path(dmd->u.verity.hash_device),
vp->data_block_size, vp->hash_block_size,
vp->data_size, dmd->u.verity.hash_offset,
vp->hash_name, hexroot, hexsalt);
return r;
}
-int dm_remove_device(const char *name, int force, uint64_t size)
+int dm_remove_device(struct crypt_device *cd, const char *name,
+ int force, uint64_t size)
{
int r = -EINVAL;
int retries = force ? RETRY_COUNT : 1;
if (!name || (force && !size))
return -EINVAL;
+ if (dm_init_context(cd))
+ return -ENOTSUP;
+
do {
r = _dm_simple(DM_DEVICE_REMOVE, name, 1) ? 0 : -EINVAL;
if (--retries && r) {
log_dbg("WARNING: other process locked internal device %s, %s.",
name, retries ? "retrying remove" : "giving up");
- if (force && (crypt_get_debug_level() == CRYPT_LOG_DEBUG))
- debug_processes_using_device(name);
sleep(1);
if (force && !error_target) {
/* If force flag is set, replace device with error, read-only target.
} while (r == -EINVAL && retries);
dm_task_update_nodes();
+ dm_exit_context();
return r;
}
}
static int _dm_create_device(const char *name, const char *type,
- const char *device, uint32_t flags,
+ struct device *device, uint32_t flags,
const char *uuid, uint64_t size,
char *params, int reload)
{
}
if (r < 0 && !reload)
- dm_remove_device(name, 0, 0);
+ _dm_simple(DM_DEVICE_REMOVE, name, 1);
out_no_removal:
if (cookie && _dm_use_udev())
return r;
}
-int dm_create_device(const char *name,
+int dm_create_device(struct crypt_device *cd, const char *name,
const char *type,
struct crypt_dm_active_device *dmd,
int reload)
{
char *table_params = NULL;
+ int r = -EINVAL;
+
+ if (!type)
+ return -EINVAL;
+
+ if (dm_init_context(cd))
+ return -ENOTSUP;
if (dmd->target == DM_CRYPT)
table_params = get_dm_crypt_params(dmd);
else if (dmd->target == DM_VERITY)
table_params = get_dm_verity_params(dmd->u.verity.vp, dmd);
- if (!table_params || !type)
- return -EINVAL;
-
- return _dm_create_device(name, type, dmd->data_device, dmd->flags,
- dmd->uuid, dmd->size, table_params, reload);
+ if (table_params)
+ r = _dm_create_device(name, type, dmd->data_device,
+ dmd->flags, dmd->uuid, dmd->size,
+ table_params, reload);
+ dm_exit_context();
+ return r;
}
static int dm_status_dmi(const char *name, struct dm_info *dmi,
return r;
}
-int dm_status_device(const char *name)
+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 differenly 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))
+ return -ENOTSUP;
r = dm_status_dmi(name, &dmi, NULL, NULL);
+ dm_exit_context();
if (r < 0)
return r;
return (dmi.open_count > 0);
}
-int dm_status_suspended(const char *name)
+int dm_status_suspended(struct crypt_device *cd, const char *name)
{
int r;
struct dm_info dmi;
+ if (dm_init_context(cd))
+ return -ENOTSUP;
r = dm_status_dmi(name, &dmi, DM_CRYPT_TARGET, NULL);
+ dm_exit_context();
if (r < 0)
return r;
return dmi.suspended ? 1 : 0;
}
-int dm_status_verity_ok(const char *name)
+static int _dm_status_verity_ok(const char *name)
{
int r;
struct dm_info dmi;
return r;
}
+int dm_status_verity_ok(struct crypt_device *cd, const char *name)
+{
+ int r;
+
+ if (dm_init_context(cd))
+ return -ENOTSUP;
+ r = _dm_status_verity_ok(name);
+ dm_exit_context();
+ return r;
+}
+
/* FIXME use hex wrapper, user val wrappers for line parsing */
static int _dm_query_crypt(uint32_t get_flags,
struct dm_info *dmi,
uint64_t val64;
char *rcipher, *key_, *rdevice, *endp, buffer[3], *arg;
unsigned int i;
+ int r;
memset(dmd, 0, sizeof(*dmd));
dmd->target = DM_CRYPT;
/* device */
rdevice = strsep(¶ms, " ");
- if (get_flags & DM_ACTIVE_DEVICE)
- dmd->data_device = crypt_lookup_dev(rdevice);
+ if (get_flags & DM_ACTIVE_DEVICE) {
+ arg = crypt_lookup_dev(rdevice);
+ r = device_alloc(&dmd->data_device, arg);
+ free(arg);
+ if (r < 0 && r != -ENOTBLK)
+ return r;
+ }
/*offset */
if (!params)
struct crypt_params_verity *vp = NULL;
uint32_t val32;
uint64_t val64;
- size_t len;
+ ssize_t len;
char *str, *str2;
+ int r;
if (get_flags & DM_ACTIVE_VERITY_PARAMS)
vp = dmd->u.verity.vp;
str = strsep(¶ms, " ");
if (!params)
return -EINVAL;
- if (get_flags & DM_ACTIVE_DEVICE)
- dmd->data_device = crypt_lookup_dev(str);
+ if (get_flags & DM_ACTIVE_DEVICE) {
+ str2 = crypt_lookup_dev(str);
+ r = device_alloc(&dmd->data_device, str2);
+ free(str2);
+ if (r < 0 && r != -ENOTBLK)
+ return r;
+ }
/* hash device */
str = strsep(¶ms, " ");
if (!params)
return -EINVAL;
- if (get_flags & DM_ACTIVE_VERITY_HASH_DEVICE)
- dmd->u.verity.hash_device = crypt_lookup_dev(str);
+ if (get_flags & DM_ACTIVE_VERITY_HASH_DEVICE) {
+ str2 = crypt_lookup_dev(str);
+ r = device_alloc(&dmd->u.verity.hash_device, str2);
+ free(str2);
+ if (r < 0 && r != -ENOTBLK)
+ return r;
+ }
/* data block size*/
val32 = strtoul(params, ¶ms, 10);
str = strsep(¶ms, " ");
if (!params)
return -EINVAL;
- len = strlen(str) / 2;
+ len = crypt_hex_to_bytes(str, &str2, 0);
+ if (len < 0)
+ return len;
dmd->u.verity.root_hash_size = len;
- if (get_flags & DM_ACTIVE_VERITY_ROOT_HASH) {
- if (!(str2 = malloc(len)))
- return -ENOMEM;
- if (hex_to_bytes(str, str2) != len)
- return -EINVAL;
+ if (get_flags & DM_ACTIVE_VERITY_ROOT_HASH)
dmd->u.verity.root_hash = str2;
- }
+ else
+ free(str2);
/* salt */
str = strsep(¶ms, " ");
if (params)
return -EINVAL;
if (vp) {
- len = strlen(str) / 2;
- vp->salt_size = len;
- if (!(str2 = malloc(len)))
- return -ENOMEM;
- if (hex_to_bytes(str, str2) != len)
- return -EINVAL;
- vp->salt = str2;
+ if (!strcmp(str, "-")) {
+ vp->salt_size = 0;
+ vp->salt = NULL;
+ } else {
+ len = crypt_hex_to_bytes(str, &str2, 0);
+ if (len < 0)
+ return len;
+ vp->salt_size = len;
+ vp->salt = str2;
+ }
}
return 0;
}
-int dm_query_device(const char *name, uint32_t get_flags,
- struct crypt_dm_active_device *dmd)
+int dm_query_device(struct crypt_device *cd, const char *name,
+ uint32_t get_flags, struct crypt_dm_active_device *dmd)
{
struct dm_task *dmt;
struct dm_info dmi;
void *next = NULL;
int r = -EINVAL;
+ if (dm_init_context(cd))
+ return -ENOTSUP;
if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
goto out;
if ((dm_flags() & DM_SECURE_SUPPORTED) && !dm_task_secure_data(dmt))
r = _dm_query_verity(get_flags, &dmi, params, dmd);
if (r < 0)
goto out;
- r = dm_status_verity_ok(name);
+ r = _dm_status_verity_ok(name);
if (r < 0)
goto out;
if (r == 0)
if (dmt)
dm_task_destroy(dmt);
+ dm_exit_context();
return r;
}
return r;
}
-int dm_suspend_and_wipe_key(const char *name)
+int dm_suspend_and_wipe_key(struct crypt_device *cd, const char *name)
{
- if (!_dm_check_versions())
+ int r = -ENOTSUP;
+
+ if (dm_init_context(cd))
return -ENOTSUP;
if (!(_dm_crypt_flags & DM_KEY_WIPE_SUPPORTED))
- return -ENOTSUP;
+ goto out;
- if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0))
- return -EINVAL;
+ if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0)) {
+ r = -EINVAL;
+ goto out;
+ }
if (!_dm_message(name, "key wipe")) {
_dm_simple(DM_DEVICE_RESUME, name, 1);
- return -EINVAL;
+ r = -EINVAL;
+ goto out;
}
-
- return 0;
+ r = 0;
+out:
+ dm_exit_context();
+ return r;
}
-int dm_resume_and_reinstate_key(const char *name,
- size_t key_size,
- const char *key)
+int dm_resume_and_reinstate_key(struct crypt_device *cd, const char *name,
+ size_t key_size, const char *key)
{
int msg_size = key_size * 2 + 10; // key set <key>
- char *msg;
- int r = 0;
+ char *msg = NULL;
+ int r = -ENOTSUP;
- if (!_dm_check_versions())
+ if (dm_init_context(cd))
return -ENOTSUP;
if (!(_dm_crypt_flags & DM_KEY_WIPE_SUPPORTED))
- return -ENOTSUP;
+ goto out;
msg = crypt_safe_alloc(msg_size);
- if (!msg)
- return -ENOMEM;
+ if (!msg) {
+ r = -ENOMEM;
+ goto out;
+ }
- memset(msg, 0, msg_size);
strcpy(msg, "key set ");
hex_key(&msg[8], key_size, key);
if (!_dm_message(name, msg) ||
- !_dm_simple(DM_DEVICE_RESUME, name, 1))
+ !_dm_simple(DM_DEVICE_RESUME, name, 1)) {
r = -EINVAL;
-
+ goto out;
+ }
+ r = 0;
+out:
crypt_safe_free(msg);
+ dm_exit_context();
return r;
}
{
return strncmp(name, "dm-", 3) ? 0 : 1;
}
-
-int dm_check_segment(const char *name, uint64_t offset, uint64_t size)
-{
- struct crypt_dm_active_device dmd;
- int r;
-
- log_dbg("Checking segments for device %s.", name);
-
- r = dm_query_device(name, 0, &dmd);
- if (r < 0)
- return r;
-
- if (offset >= (dmd.u.crypt.offset + dmd.size) ||
- (offset + size) <= dmd.u.crypt.offset)
- r = 0;
- else
- r = -EBUSY;
-
- log_dbg("seg: %" PRIu64 " - %" PRIu64 ", new %" PRIu64 " - %" PRIu64 "%s",
- dmd.u.crypt.offset, dmd.u.crypt.offset + dmd.size, offset, offset + size,
- r ? " (overlapping)" : " (ok)");
-
- return r;
-}
projects / platform / upstream / cryptsetup.git / blobdiff