/usr/bin/pfrom is in heimdal-clients 1.6~rc2+dfsg-9+deb8u1.
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 | #!/bin/sh
# $Id$
libexecdir=/usr/sbin
PATH=$libexecdir:$PATH
export PATH
push --from $*
|