#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <libdevmapper.h>
#include <fcntl.h>
#include <linux/fs.h>
+#include <uuid/uuid.h>
#include "internal.h"
#include "luks.h"
#define DEVICE_DIR "/dev"
+#define DM_UUID_LEN 129
#define DM_UUID_PREFIX "CRYPT-"
#define DM_UUID_PREFIX_LEN 6
-#define DM_UUID_LEN UUID_STRING_L
#define DM_CRYPT_TARGET "crypt"
#define RETRY_COUNT 5
+/* Set if dm-crypt version was probed */
+static int _dm_crypt_checked = 0;
+static int _dm_crypt_wipe_key_supported = 0;
+
static int _dm_use_count = 0;
static struct crypt_device *_context = NULL;
+/* 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()
+{
+#ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
+ return dm_udev_get_sync_support();
+#else
+ return 0;
+#endif
+}
+
static void set_dm_error(int level, const char *file, int line,
const char *f, ...)
{
va_end(va);
}
-static int _dm_simple(int task, const char *name);
+static int _dm_simple(int task, const char *name, int udev_wait);
+
+static void _dm_set_crypt_compat(int maj, int min, int patch)
+{
+ log_dbg("Detected dm-crypt target of version %i.%i.%i.", maj, min, patch);
+
+ if (maj >= 1 && min >=2)
+ _dm_crypt_wipe_key_supported = 1;
+ else
+ log_dbg("Suspend and resume disabled, no wipe key support.");
+
+ _dm_crypt_checked = 1;
+}
+
+static int _dm_check_versions(void)
+{
+ struct dm_task *dmt;
+ struct dm_versions *target, *last_target;
+
+ if (_dm_crypt_checked)
+ return 1;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
+ return 0;
+
+ if (!dm_task_run(dmt)) {
+ dm_task_destroy(dmt);
+ return 0;
+ }
+
+ target = dm_task_get_versions(dmt);
+ do {
+ last_target = target;
+ if (!strcmp(DM_CRYPT_TARGET, target->name)) {
+ _dm_set_crypt_compat((int)target->version[0],
+ (int)target->version[1],
+ (int)target->version[2]);
+ }
+ target = (void *) target + target->next;
+ } while (last_target != target);
+
+ dm_task_destroy(dmt);
+ return 1;
+}
int dm_init(struct crypt_device *context, int check_kernel)
{
if (!_dm_use_count++) {
- log_dbg("Initialising device-mapper backend%s.",
- check_kernel ? "" : " (NO kernel check requested)");
- if (check_kernel && !_dm_simple(DM_DEVICE_LIST_VERSIONS, NULL))
+ 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."));
dm_log_init(set_dm_error);
dm_log_init_verbose(10);
}
+ // FIXME: global context is not safe
if (context)
_context = context;
}
}
-static char *__lookup_dev(char *path, dev_t dev)
+static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
{
struct dirent *entry;
struct stat st;
DIR *dir;
int space;
+ /* Ignore strange nested directories */
+ if (dir_level > max_level)
+ return NULL;
+
path[PATH_MAX - 1] = '\0';
ptr = path + strlen(path);
*ptr++ = '/';
return NULL;
while((entry = readdir(dir))) {
- if (entry->d_name[0] == '.' &&
- (entry->d_name[1] == '\0' || (entry->d_name[1] == '.' &&
- entry->d_name[2] == '\0')))
+ if (entry->d_name[0] == '.' ||
+ !strncmp(entry->d_name, "..", 2))
continue;
strncpy(ptr, entry->d_name, space);
- if (lstat(path, &st) < 0)
+ if (stat(path, &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
- result = __lookup_dev(path, dev);
+ result = __lookup_dev(path, dev, dir_level + 1, max_level);
if (result)
break;
} else if (S_ISBLK(st.st_mode)) {
+ /* workaround: ignore dm-X devices, these are internal kernel names */
+ if (dir_level == 0 && !strncmp(entry->d_name, "dm-", 3))
+ continue;
if (st.st_rdev == dev) {
result = strdup(path);
break;
}
closedir(dir);
-
return result;
}
-static char *lookup_dev(const char *dev)
+static char *lookup_dev(const char *dev_id)
{
uint32_t major, minor;
- char buf[PATH_MAX + 1];
+ dev_t dev;
+ char *result = NULL, buf[PATH_MAX + 1];
- if (sscanf(dev, "%" PRIu32 ":%" PRIu32, &major, &minor) != 2)
+ if (sscanf(dev_id, "%" PRIu32 ":%" PRIu32, &major, &minor) != 2)
return NULL;
+ dev = makedev(major, minor);
strncpy(buf, DEVICE_DIR, PATH_MAX);
buf[PATH_MAX] = '\0';
- return __lookup_dev(buf, makedev(major, minor));
+ /* First try low level device */
+ if ((result = __lookup_dev(buf, dev, 0, 0)))
+ return result;
+
+ /* If it is dm, try DM dir */
+ if (dm_is_dm_major(major)) {
+ strncpy(buf, dm_dir(), PATH_MAX);
+ if ((result = __lookup_dev(buf, dev, 0, 0)))
+ return result;
+ }
+
+ strncpy(buf, DEVICE_DIR, PATH_MAX);
+ result = __lookup_dev(buf, dev, 0, 4);
+
+ /* If not found, return NULL */
+ return result;
}
static int _dev_read_ahead(const char *dev, uint32_t *read_ahead)
return r;
}
+static void hex_key(char *hexkey, size_t key_size, const char *key)
+{
+ int i;
+
+ for(i = 0; i < key_size; i++)
+ sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
+}
+
static char *get_params(const char *device, uint64_t skip, uint64_t offset,
const char *cipher, size_t key_size, const char *key)
{
char *params;
char *hexkey;
- int i;
hexkey = safe_alloc(key_size * 2 + 1);
if (!hexkey)
return NULL;
- for(i = 0; i < key_size; i++)
- sprintf(&hexkey[i * 2], "%02x", (unsigned char)key[i]);
+ hex_key(hexkey, key_size, key);
params = safe_alloc(strlen(hexkey) + strlen(cipher) + strlen(device) + 64);
if (!params)
}
/* DM helpers */
-static int _dm_simple(int task, const char *name)
+static int _dm_simple(int task, const char *name, int udev_wait)
{
int r = 0;
struct dm_task *dmt;
+ uint32_t cookie = 0;
+
+ if (!_dm_use_udev())
+ udev_wait = 0;
if (!(dmt = dm_task_create(task)))
return 0;
if (name && !dm_task_set_name(dmt, name))
goto out;
+ if (udev_wait && !_dm_task_set_cookie(dmt, &cookie, 0))
+ goto out;
+
r = dm_task_run(dmt);
+ if (udev_wait)
+ (void)_dm_udev_wait(cookie);
+
out:
dm_task_destroy(dmt);
return r;
if (!dm_task_run(dmt))
goto error;
- if (!_dm_simple(DM_DEVICE_RESUME, name)) {
- _dm_simple(DM_DEVICE_CLEAR, name);
+ if (!_dm_simple(DM_DEVICE_RESUME, name, 1)) {
+ _dm_simple(DM_DEVICE_CLEAR, name, 0);
goto error;
}
{
int r = -EINVAL;
int retries = force ? RETRY_COUNT : 1;
+ int error_target = 0;
if (!name || (force && !size))
return -EINVAL;
- /* 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.
- * Force flag should be used only for temporary devices, which are
- * intended to work inside cryptsetup only!
- * Anyway, if some process try to read temporary cryptsetup device,
- * it is bug - no other process should try touch it (e.g. udev).
- */
- if (force) {
- _error_device(name, size);
- retries = RETRY_COUNT;
- }
-
do {
- r = _dm_simple(DM_DEVICE_REMOVE, name) ? 0 : -EINVAL;
+ 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.
+ * it should stop processes from reading it and also removed underlying
+ * device from mapping, so it is usable again.
+ * Force flag should be used only for temporary devices, which are
+ * intended to work inside cryptsetup only!
+ * Anyway, if some process try to read temporary cryptsetup device,
+ * it is bug - no other process should try touch it (e.g. udev).
+ */
+ _error_device(name, size);
+ error_target = 1;
+ }
}
} while (r == -EINVAL && retries);
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 void dm_prepare_uuid(const char *name, const char *type, const char *uuid, char *buf, size_t buflen)
+{
+ char *ptr, uuid2[UUID_LEN] = {0};
+ uuid_t uu;
+ int i = 0;
+
+ /* Remove '-' chars */
+ if (uuid && !uuid_parse(uuid, uu)) {
+ 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("DM-UUID is %s", buf);
+ if (i >= buflen)
+ log_err(NULL, _("DM-UUID for device %s was truncated.\n"), name);
+}
+
int dm_create_device(const char *name,
const char *device,
const char *cipher,
+ const char *type,
const char *uuid,
uint64_t size,
uint64_t skip,
int reload)
{
struct dm_task *dmt = NULL;
- struct dm_task *dmt_query = NULL;
struct dm_info dmi;
char *params = NULL;
char *error = NULL;
- char dev_uuid[DM_UUID_PREFIX_LEN + DM_UUID_LEN + 1] = {0};
+ char dev_uuid[DM_UUID_LEN] = {0};
int r = -EINVAL;
uint32_t read_ahead = 0;
+ uint32_t cookie = 0;
+ uint16_t udev_flags = 0;
params = get_params(device, skip, offset, cipher, key_size, key);
if (!params)
goto out_no_removal;
-
- if (uuid) {
- strncpy(dev_uuid, DM_UUID_PREFIX, DM_UUID_PREFIX_LEN);
- strncpy(dev_uuid + DM_UUID_PREFIX_LEN, uuid, DM_UUID_LEN);
- dev_uuid[DM_UUID_PREFIX_LEN + DM_UUID_LEN] = '\0';
+
+ if (type && !strncmp(type, "TEMP", 4))
+ udev_flags = CRYPT_TEMP_UDEV_FLAGS;
+
+ /* All devices must have DM_UUID, only resize on old device is exception */
+ if (reload) {
+ if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
+ goto out_no_removal;
+
+ if (!dm_task_set_name(dmt, name))
+ goto out_no_removal;
+ } else {
+ dm_prepare_uuid(name, type, uuid, dev_uuid, sizeof(dev_uuid));
+
+ if (!(dmt = dm_task_create(DM_DEVICE_CREATE)))
+ goto out_no_removal;
+
+ if (!dm_task_set_name(dmt, name))
+ goto out_no_removal;
+
+ if (!dm_task_set_uuid(dmt, dev_uuid))
+ goto out_no_removal;
+
+ if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
+ goto out_no_removal;
}
- if (!(dmt = dm_task_create(reload ? DM_DEVICE_RELOAD
- : DM_DEVICE_CREATE)))
- goto out_no_removal;
- if (!dm_task_set_name(dmt, name))
- goto out_no_removal;
if (read_only && !dm_task_set_ro(dmt))
goto out_no_removal;
if (!dm_task_add_target(dmt, 0, size, DM_CRYPT_TARGET, params))
goto out_no_removal;
#endif
- if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
- goto out_no_removal;
-
if (!dm_task_run(dmt))
goto out_no_removal;
goto out;
if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
goto out;
+ if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
+ goto out;
if (!dm_task_run(dmt))
goto out;
}
r = 0;
out:
+ if (_dm_use_udev()) {
+ (void)_dm_udev_wait(cookie);
+ cookie = 0;
+ }
+
if (r < 0 && !reload) {
if (get_error())
error = strdup(get_error());
}
out_no_removal:
+ if (cookie && _dm_use_udev())
+ (void)_dm_udev_wait(cookie);
+
if (params)
safe_free(params);
if (dmt)
dm_task_destroy(dmt);
- if(dmt_query)
- dm_task_destroy(dmt_query);
+
dm_task_update_nodes();
return r;
}
}
if (!dm_task_run(dmt)) {
- r = -ENODEV;
+ r = -EINVAL;
goto out;
}
char **cipher,
int *key_size,
char **key,
- int *read_only)
+ int *read_only,
+ int *suspended,
+ char **uuid)
{
struct dm_task *dmt;
struct dm_info dmi;
uint64_t start, length, val64;
- char *target_type, *params, *rcipher, *key_, *rdevice, *endp, buffer[3];
+ char *target_type, *params, *rcipher, *key_, *rdevice, *endp, buffer[3], *tmp_uuid;
void *next = NULL;
int i, r = -EINVAL;
}
memset(key_, 0, strlen(key_));
- /* read_only */
if (read_only)
*read_only = dmi.read_only;
+ if (suspended)
+ *suspended = dmi.suspended;
+
+ if (uuid && (tmp_uuid = (char*)dm_task_get_uuid(dmt)) &&
+ !strncmp(tmp_uuid, DM_UUID_PREFIX, DM_UUID_PREFIX_LEN))
+ *uuid = strdup(tmp_uuid + DM_UUID_PREFIX_LEN);
+
r = (dmi.open_count > 0);
out:
if (dmt)
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 (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_and_wipe_key(const char *name)
+{
+ if (!_dm_check_versions())
+ return -ENOTSUP;
+
+ if (!_dm_crypt_wipe_key_supported)
+ return -ENOTSUP;
+
+ if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0))
+ return -EINVAL;
+
+ if (!_dm_message(name, "key wipe")) {
+ _dm_simple(DM_DEVICE_RESUME, name, 1);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int dm_resume_and_reinstate_key(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;
+
+ if (!_dm_check_versions())
+ return -ENOTSUP;
+
+ if (!_dm_crypt_wipe_key_supported)
+ return -ENOTSUP;
+
+ msg = safe_alloc(msg_size);
+ if (!msg)
+ return -ENOMEM;
+
+ 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))
+ r = -EINVAL;
+
+ safe_free(msg);
+ return r;
+}
+
const char *dm_get_dir(void)
{
return dm_dir();
projects / platform / upstream / cryptsetup.git / blobdiff