/usr/bin/sdm-ssh-askpass is in sdm-terminal 0.4.1-4.
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 | #!/bin/sh
# Copyright 2003, 2004 Vagrant Cascadian <vagrant@freegeek.org>.
# Licensed under the terms of the GNU General Public License,
# version 2 or any later version.
# $1 contains "$user@$server's password:"
zenity --entry --hide-text \
--title="Enter password" \
--text="$1"
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