src/basic/fileio-label.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sys/stat.h>
   4
   5 #include "fileio-label.h"
   6 #include "fileio.h"
   7 #include "selinux-util.h"
   8
   9 int write_string_file_atomic_label_ts(const char *fn, const char *line, struct timespec *ts) {
  10         int r;
  11
  12         r = mac_selinux_create_file_prepare(fn, S_IFREG);
  13         if (r < 0)
  14                 return r;
  15
  16         r = write_string_file_ts(fn, line, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC, ts);
  17
  18         mac_selinux_create_file_clear();
  19
  20         return r;
  21 }
  22
  23 int write_env_file_label(const char *fname, char **l) {
  24         int r;
  25
  26         r = mac_selinux_create_file_prepare(fname, S_IFREG);
  27         if (r < 0)
  28                 return r;
  29
  30         r = write_env_file(fname, l);
  31
  32         mac_selinux_create_file_clear();
  33
  34         return r;
  35 }
  36
  37 int fopen_temporary_label(const char *target,
  38                           const char *path, FILE **f, char **temp_path) {
  39         int r;
  40
  41         r = mac_selinux_create_file_prepare(target, S_IFREG);
  42         if (r < 0)
  43                 return r;
  44
  45         r = fopen_temporary(path, f, temp_path);
  46
  47         mac_selinux_create_file_clear();
  48
  49         return r;
  50 }
  51
  52 int create_shutdown_run_nologin_or_warn(void) {
  53         int r;
  54
  55         /* This is used twice: once in systemd-user-sessions.service, in order to block logins when we actually go
  56          * down, and once in systemd-logind.service when shutdowns are scheduled, and logins are to be turned off a bit
  57          * in advance. We use the same wording of the message in both cases. */
  58
  59         r = write_string_file_atomic_label("/run/nologin",
  60                                            "System is going down. Unprivileged users are not permitted to log in anymore. "
  61                                            "For technical details, see pam_nologin(8).");
  62         if (r < 0)
  63                 return log_error_errno(r, "Failed to create /run/nologin: %m");
  64
  65         return 0;
  66 }