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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "homework-cifs.h"
#include "homework-mount.h"
#include "mount-util.h"
#include "process-util.h"
#include "strv.h"
#include "tmpfile-util.h"
int home_prepare_cifs(
UserRecord *h,
bool already_activated,
HomeSetup *setup) {
assert(h);
assert(setup);
assert(user_record_storage(h) == USER_CIFS);
if (already_activated)
setup->root_fd = open(user_record_home_directory(h), O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
else {
bool mounted = false;
char **pw;
int r;
r = home_unshare_and_mount(NULL, NULL, false, user_record_mount_flags(h));
if (r < 0)
return r;
STRV_FOREACH(pw, h->password) {
_cleanup_(unlink_and_freep) char *p = NULL;
_cleanup_free_ char *options = NULL;
_cleanup_(fclosep) FILE *f = NULL;
pid_t mount_pid;
int exit_status;
r = fopen_temporary(NULL, &f, &p);
if (r < 0)
return log_error_errno(r, "Failed to create temporary credentials file: %m");
fprintf(f,
"username=%s\n"
"password=%s\n",
user_record_cifs_user_name(h),
*pw);
if (h->cifs_domain)
fprintf(f, "domain=%s\n", h->cifs_domain);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write temporary credentials file: %m");
f = safe_fclose(f);
if (asprintf(&options, "credentials=%s,uid=" UID_FMT ",forceuid,gid=" UID_FMT ",forcegid,file_mode=0%3o,dir_mode=0%3o",
p, h->uid, h->uid, h->access_mode, h->access_mode) < 0)
return log_oom();
r = safe_fork("(mount)", FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_LOG|FORK_STDOUT_TO_STDERR, &mount_pid);
if (r < 0)
return r;
if (r == 0) {
/* Child */
execl("/bin/mount", "/bin/mount", "-n", "-t", "cifs",
h->cifs_service, "/run/systemd/user-home-mount",
"-o", options, NULL);
log_error_errno(errno, "Failed to execute fsck: %m");
_exit(EXIT_FAILURE);
}
exit_status = wait_for_terminate_and_check("mount", mount_pid, WAIT_LOG_ABNORMAL|WAIT_LOG_NON_ZERO_EXIT_STATUS);
if (exit_status < 0)
return exit_status;
if (exit_status != EXIT_SUCCESS)
return -EPROTO;
mounted = true;
break;
}
if (!mounted)
return log_error_errno(ENOKEY, "Failed to mount home directory with supplied password.");
setup->root_fd = open("/run/systemd/user-home-mount", O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
}
if (setup->root_fd < 0)
return log_error_errno(errno, "Failed to open home directory: %m");
return 0;
}
int home_activate_cifs(
UserRecord *h,
PasswordCache *cache,
UserRecord **ret_home) {
_cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT;
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL;
const char *hdo, *hd;
int r;
assert(h);
assert(user_record_storage(h) == USER_CIFS);
assert(ret_home);
if (!h->cifs_service)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks CIFS service, refusing.");
assert_se(hdo = user_record_home_directory(h));
hd = strdupa(hdo); /* copy the string out, since it might change later in the home record object */
r = home_prepare_cifs(h, false, &setup);
if (r < 0)
return r;
r = home_refresh(h, &setup, NULL, cache, NULL, &new_home);
if (r < 0)
return r;
setup.root_fd = safe_close(setup.root_fd);
r = home_move_mount(NULL, hd);
if (r < 0)
return r;
setup.undo_mount = false;
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 1;
}
int home_create_cifs(UserRecord *h, UserRecord **ret_home) {
_cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT;
_cleanup_(user_record_unrefp) UserRecord *new_home = NULL;
_cleanup_(closedirp) DIR *d = NULL;
_cleanup_close_ int copy = -1;
int r;
assert(h);
assert(user_record_storage(h) == USER_CIFS);
assert(ret_home);
if (!h->cifs_service)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks CIFS service, refusing.");
if (access("/sbin/mount.cifs", F_OK) < 0) {
if (errno == ENOENT)
return log_error_errno(SYNTHETIC_ERRNO(ENOLINK), "/sbin/mount.cifs is missing.");
return log_error_errno(errno, "Unable to detect whether /sbin/mount.cifs exists: %m");
}
r = home_prepare_cifs(h, false, &setup);
if (r < 0)
return r;
copy = fcntl(setup.root_fd, F_DUPFD_CLOEXEC, 3);
if (copy < 0)
return -errno;
d = take_fdopendir(©);
if (!d)
return -errno;
errno = 0;
if (readdir_no_dot(d))
return log_error_errno(SYNTHETIC_ERRNO(ENOTEMPTY), "Selected CIFS directory not empty, refusing.");
if (errno != 0)
return log_error_errno(errno, "Failed to detect if CIFS directory is empty: %m");
r = home_populate(h, setup.root_fd);
if (r < 0)
return r;
r = home_sync_and_statfs(setup.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_CIFS,
NULL,
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");
log_info("Everything completed.");
*ret_home = TAKE_PTR(new_home);
return 0;
}
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