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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* manage device node user ACL
*
* Copyright 2010-2012 Kay Sievers <kay@vrfy.org>
* Copyright 2010 Lennart Poettering
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "sd-login.h"
#include "login-util.h"
#include "logind-acl.h"
#include "util.h"
/*
* Copy of builtin_uaccess() from
* systemd/src/udev/udev-builtin-uaccess.c
*/
static int dev_uaccess(const char *path, const char *seat) {
int r;
bool changed_acl = false;
uid_t uid;
umask(0022);
/* don't muck around with ACLs when the system is not running logind */
if (!logind_running())
return 0;
if (!seat || !strlen(seat))
seat = "seat0";
r = sd_seat_get_active(seat, NULL, &uid);
if (IN_SET(r, -ENXIO, -ENODATA)) {
/* No active session on this seat */
r = 0;
goto finish;
} else if (r < 0) {
log_error("Failed to determine active user on seat %s.", seat);
goto finish;
}
r = devnode_acl(path, true, false, 0, true, uid);
if (r < 0) {
log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_ERR, r, "Failed to apply ACL on %s: %m", path);
goto finish;
}
changed_acl = true;
r = 0;
finish:
if (path && !changed_acl) {
int k;
/* Better be safe than sorry and reset ACL */
k = devnode_acl(path, true, false, 0, false, 0);
if (k < 0) {
log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, k, "Failed to reset ACL on %s: %m", path);
if (r >= 0)
r = k;
}
}
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
int main(int argc, char *argv[]) {
if (argc < 2) {
printf("Usage: %s DEVPATH [SEAT]\n", argv[0]);
return 0;
}
elogind_set_program_name(argv[0]);
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
return dev_uaccess(argv[1], argc > 2 ? argv[2] : NULL);
}
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