src/basic/fileio-label.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4   Copyright 2010 Harald Hoyer
   5 ***/
   6
   7 #include <sys/stat.h>
   8
   9 #include "fileio-label.h"
  10 #include "fileio.h"
  11 #include "selinux-util.h"
  12
  13 int write_string_file_atomic_label_ts(const char *fn, const char *line, struct timespec *ts) {
  14         int r;
  15
  16         r = mac_selinux_create_file_prepare(fn, S_IFREG);
  17         if (r < 0)
  18                 return r;
  19
  20         r = write_string_file_ts(fn, line, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC, ts);
  21
  22         mac_selinux_create_file_clear();
  23
  24         return r;
  25 }
  26
  27 int write_env_file_label(const char *fname, char **l) {
  28         int r;
  29
  30         r = mac_selinux_create_file_prepare(fname, S_IFREG);
  31         if (r < 0)
  32                 return r;
  33
  34         r = write_env_file(fname, l);
  35
  36         mac_selinux_create_file_clear();
  37
  38         return r;
  39 }
  40
  41 int fopen_temporary_label(const char *target,
  42                           const char *path, FILE **f, char **temp_path) {
  43         int r;
  44
  45         r = mac_selinux_create_file_prepare(target, S_IFREG);
  46         if (r < 0)
  47                 return r;
  48
  49         r = fopen_temporary(path, f, temp_path);
  50
  51         mac_selinux_create_file_clear();
  52
  53         return r;
  54 }
  55
  56 int create_shutdown_run_nologin_or_warn(void) {
  57         int r;
  58
  59         /* This is used twice: once in systemd-user-sessions.service, in order to block logins when we actually go
  60          * down, and once in systemd-logind.service when shutdowns are scheduled, and logins are to be turned off a bit
  61          * in advance. We use the same wording of the message in both cases. */
  62
  63         r = write_string_file_atomic_label("/run/nologin",
  64                                            "System is going down. Unprivileged users are not permitted to log in anymore. "
  65                                            "For technical details, see pam_nologin(8).");
  66         if (r < 0)
  67                 return log_error_errno(r, "Failed to create /run/nologin: %m");
  68
  69         return 0;
  70 }