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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sys/mount.h>
#include "btrfs-util.h"
#include "fd-util.h"
#include "homework-directory.h"
#include "homework-quota.h"
#include "mkdir.h"
#include "mount-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "tmpfile-util.h"
#include "umask-util.h"
int home_prepare_directory(UserRecord *h, bool already_activated, HomeSetup *setup) {
assert(h);
assert(setup);
setup->root_fd = open(user_record_image_path(h), O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (setup->root_fd < 0)
return log_error_errno(errno, "Failed to open home directory: %m");
return 0;
}
int home_activate_directory(
UserRecord *h,
PasswordCache *cache,
UserRecord **ret_home) {
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL, *header_home = NULL;
_cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT;
const char *hdo, *hd, *ipo, *ip;
int r;
assert(h);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT));
assert(ret_home);
assert_se(ipo = user_record_image_path(h));
ip = strdupa(ipo); /* copy out, since reconciliation might cause changing of the field */
assert_se(hdo = user_record_home_directory(h));
hd = strdupa(hdo);
r = home_prepare(h, false, cache, &setup, &header_home);
if (r < 0)
return r;
r = home_refresh(h, &setup, header_home, cache, NULL, &new_home);
if (r < 0)
return r;
setup.root_fd = safe_close(setup.root_fd);
/* Create mount point to mount over if necessary */
if (!path_equal(ip, hd))
(void) mkdir_p(hd, 0700);
/* Create a mount point (even if the directory is already placed correctly), as a way to indicate
* this mount point is now "activated". Moreover, we want to set per-user
* MS_NOSUID/MS_NOEXEC/MS_NODEV. */
r = mount_nofollow_verbose(LOG_ERR, ip, hd, NULL, MS_BIND, NULL);
if (r < 0)
return r;
r = mount_nofollow_verbose(LOG_ERR, NULL, hd, NULL, MS_BIND|MS_REMOUNT|user_record_mount_flags(h), NULL);
if (r < 0) {
(void) umount_verbose(LOG_ERR, hd, UMOUNT_NOFOLLOW);
return r;
}
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
int home_create_directory_or_subvolume(UserRecord *h, UserRecord **ret_home) {
_cleanup_(rm_rf_subvolume_and_freep) char *temporary = NULL;
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL;
_cleanup_close_ int root_fd = -1;
_cleanup_free_ char *d = NULL;
const char *ip;
int r;
assert(h);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME));
assert(ret_home);
assert_se(ip = user_record_image_path(h));
r = tempfn_random(ip, "homework", &d);
if (r < 0)
return log_error_errno(r, "Failed to allocate temporary directory: %m");
(void) mkdir_parents(d, 0755);
switch (user_record_storage(h)) {
case USER_SUBVOLUME:
RUN_WITH_UMASK(0077)
r = btrfs_subvol_make(d);
if (r >= 0) {
log_info("Subvolume created.");
if (h->disk_size != UINT64_MAX) {
/* Enable quota for the subvolume we just created. Note we don't check for
* errors here and only log about debug level about this. */
r = btrfs_quota_enable(d, true);
if (r < 0)
log_debug_errno(r, "Failed to enable quota on %s, ignoring: %m", d);
r = btrfs_subvol_auto_qgroup(d, 0, false);
if (r < 0)
log_debug_errno(r, "Failed to set up automatic quota group on %s, ignoring: %m", d);
/* Actually configure the quota. We also ignore errors here, but we do log
* about them loudly, to keep things discoverable even though we don't
* consider lacking quota support in kernel fatal. */
(void) home_update_quota_btrfs(h, d);
}
break;
}
if (r != -ENOTTY)
return log_error_errno(r, "Failed to create temporary home directory subvolume %s: %m", d);
log_info("Creating subvolume %s is not supported, as file system does not support subvolumes. Falling back to regular directory.", d);
_fallthrough_;
case USER_DIRECTORY:
if (mkdir(d, 0700) < 0)
return log_error_errno(errno, "Failed to create temporary home directory %s: %m", d);
(void) home_update_quota_classic(h, d);
break;
default:
assert_not_reached("unexpected storage");
}
temporary = TAKE_PTR(d); /* Needs to be destroyed now */
root_fd = open(temporary, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (root_fd < 0)
return log_error_errno(errno, "Failed to open temporary home directory: %m");
r = home_populate(h, root_fd);
if (r < 0)
return r;
r = home_sync_and_statfs(root_fd, NULL);
if (r < 0)
return r;
r = user_record_clone(h, USER_RECORD_LOAD_MASK_SECRET, &new_home);
if (r < 0)
return log_error_errno(r, "Failed to clone record: %m");
r = user_record_add_binding(
new_home,
user_record_storage(h),
ip,
SD_ID128_NULL,
SD_ID128_NULL,
SD_ID128_NULL,
NULL,
NULL,
UINT64_MAX,
NULL,
NULL,
h->uid,
(gid_t) h->uid);
if (r < 0)
return log_error_errno(r, "Failed to add binding to record: %m");
if (rename(temporary, ip) < 0)
return log_error_errno(errno, "Failed to rename %s to %s: %m", temporary, ip);
temporary = mfree(temporary);
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
int home_resize_directory(
UserRecord *h,
bool already_activated,
PasswordCache *cache,
HomeSetup *setup,
UserRecord **ret_home) {
_cleanup_(user_record_unrefp) UserRecord *embedded_home = NULL, *new_home = NULL;
int r;
assert(h);
assert(setup);
assert(ret_home);
assert(IN_SET(user_record_storage(h), USER_DIRECTORY, USER_SUBVOLUME, USER_FSCRYPT));
r = home_prepare(h, already_activated, cache, setup, NULL);
if (r < 0)
return r;
r = home_load_embedded_identity(h, setup->root_fd, NULL, USER_RECONCILE_REQUIRE_NEWER_OR_EQUAL, cache, &embedded_home, &new_home);
if (r < 0)
return r;
r = home_update_quota_auto(h, NULL);
if (ERRNO_IS_NOT_SUPPORTED(r))
return -ESOCKTNOSUPPORT; /* make recognizable */
if (r < 0)
return r;
r = home_store_embedded_identity(new_home, setup->root_fd, h->uid, embedded_home);
if (r < 0)
return r;
r = home_extend_embedded_identity(new_home, h, setup);
if (r < 0)
return r;
r = home_sync_and_statfs(setup->root_fd, NULL);
if (r < 0)
return r;
r = home_setup_undo(setup);
if (r < 0)
return r;
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
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