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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* manage device node user ACL
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "sd-login.h"
#include "device-util.h"
#include "devnode-acl.h"
#include "errno-util.h"
#include "login-util.h"
#include "log.h"
#include "udev-builtin.h"
static int builtin_uaccess(UdevEvent *event, int argc, char *argv[], bool test) {
sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
const char *path = NULL, *seat;
bool changed_acl = false;
uid_t uid;
int r;
umask(0022);
/* don't muck around with ACLs when the system is not running systemd */
if (!logind_running())
return 0;
r = sd_device_get_devname(dev, &path);
if (r < 0) {
log_device_error_errno(dev, r, "Failed to get device name: %m");
goto finish;
}
if (sd_device_get_property_value(dev, "ID_SEAT", &seat) < 0)
seat = "seat0";
r = sd_seat_get_active(seat, NULL, &uid);
if (r < 0) {
if (IN_SET(r, -ENXIO, -ENODATA))
/* No active session on this seat */
r = 0;
else
log_device_error_errno(dev, r, "Failed to determine active user on seat %s: %m", seat);
goto finish;
}
r = devnode_acl(path, true, false, 0, true, uid);
if (r < 0) {
log_device_full_errno(dev, r == -ENOENT ? LOG_DEBUG : LOG_ERR, r, "Failed to apply ACL: %m");
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_device_full_errno(dev, k == -ENOENT ? LOG_DEBUG : LOG_ERR, k, "Failed to apply ACL: %m");
RET_GATHER(r, k);
}
}
return r;
}
const UdevBuiltin udev_builtin_uaccess = {
.name = "uaccess",
.cmd = builtin_uaccess,
.help = "Manage device node user ACL",
};
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