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