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-rw-r--r--src/udev/udev-builtin-uaccess.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-uaccess.c b/src/udev/udev-builtin-uaccess.c
new file mode 100644
index 0000000..6e73d99
--- /dev/null
+++ b/src/udev/udev-builtin-uaccess.c
@@ -0,0 +1,80 @@
+/* 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 "login-util.h"
+#include "log.h"
+#include "udev-builtin.h"
+
+static int builtin_uaccess(sd_device *dev, sd_netlink **rtnl, int argc, char *argv[], bool test) {
+ 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");
+ if (r >= 0)
+ r = k;
+ }
+ }
+
+ return r;
+}
+
+const UdevBuiltin udev_builtin_uaccess = {
+ .name = "uaccess",
+ .cmd = builtin_uaccess,
+ .help = "Manage device node user ACL",
+};