/usr/share/X11/xkb/rules/ is in xkb-data 2.19-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/X11/xkb/rules/README
/usr/share/X11/xkb/rules/base
/usr/share/X11/xkb/rules/base.extras.xml
/usr/share/X11/xkb/rules/base.lst
/usr/share/X11/xkb/rules/base.xml
/usr/share/X11/xkb/rules/evdev
/usr/share/X11/xkb/rules/evdev.extras.xml
/usr/share/X11/xkb/rules/evdev.lst
/usr/share/X11/xkb/rules/evdev.xml
/usr/share/X11/xkb/rules/xfree86
/usr/share/X11/xkb/rules/xfree86.lst
/usr/share/X11/xkb/rules/xfree86.xml
/usr/share/X11/xkb/rules/xfree98
/usr/share/X11/xkb/rules/xkb.dtd
/usr/share/X11/xkb/rules/xorg
/usr/share/X11/xkb/rules/xorg.lst
/usr/share/X11/xkb/rules/xorg.xml