/etc/texmf/sitekcode.tex is in jtex-base 2.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | % Set up site-default \kanjiterminaltype and \kanjifiletype
\kanjiterminaltype=6
\kanjifiletype=6
|