/usr/lib/openssh/ssh-session-cleanup is in openssh-server 1:7.6p1-4ubuntu0.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #! /bin/sh
ssh_session_pattern='sshd: \S.*@pts/[0-9]+'
IFS="$IFS@"
pgrep -a -f "$ssh_session_pattern" | while read pid daemon user pty; do
echo "Found ${daemon%:} session $pid on $pty; sending SIGTERM"
kill "$pid" || true
done
exit 0
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