6e11e7e67d
This is an attempt to improve #8228 a bit, by extending the /run/nologin a bit, but still keeping it somewhat brief. On purpose I used the vague wording "unprivileged user" rather than "non-root user" so that pam_nologin can be updated to disable its behaviour for members of the "wheel" group one day, and our messages would still make sense. See #8228.
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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Copyright 2010 Harald Hoyer
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/stat.h>
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#include "fileio-label.h"
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#include "fileio.h"
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#include "selinux-util.h"
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int write_string_file_atomic_label_ts(const char *fn, const char *line, struct timespec *ts) {
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int r;
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r = mac_selinux_create_file_prepare(fn, S_IFREG);
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if (r < 0)
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return r;
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r = write_string_file_ts(fn, line, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC, ts);
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mac_selinux_create_file_clear();
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return r;
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}
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int write_env_file_label(const char *fname, char **l) {
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int r;
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r = mac_selinux_create_file_prepare(fname, S_IFREG);
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if (r < 0)
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return r;
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r = write_env_file(fname, l);
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mac_selinux_create_file_clear();
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return r;
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}
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int fopen_temporary_label(const char *target,
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const char *path, FILE **f, char **temp_path) {
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int r;
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r = mac_selinux_create_file_prepare(target, S_IFREG);
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if (r < 0)
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return r;
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r = fopen_temporary(path, f, temp_path);
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mac_selinux_create_file_clear();
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return r;
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}
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int create_shutdown_run_nologin_or_warn(void) {
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int r;
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/* This is used twice: once in systemd-user-sessions.service, in order to block logins when we actually go
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* down, and once in systemd-logind.service when shutdowns are scheduled, and logins are to be turned off a bit
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* in advance. We use the same wording of the message in both cases. */
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r = write_string_file_atomic_label("/run/nologin",
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"System is going down. Unprivileged users are not permitted to log in anymore. "
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"For technical details, see pam_nologin(8).");
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if (r < 0)
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return log_error_errno(r, "Failed to create /run/nologin: %m");
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return 0;
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}
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