postrm is in ssl-cert 1.0.37.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34  | #!/bin/sh -e
if [ "$1" = purge ] ; then
	rm -f /etc/ssl/certs/ssl-cert-snakeoil.pem \
	      /etc/ssl/certs/ssl-cert-snakeoil.pem.broken \
              /etc/ssl/private/ssl-cert-snakeoil.key \
	      /etc/ssl/private/ssl-cert-snakeoil.key.broken
	# remove hash symlink
	find /etc/ssl/certs -maxdepth 1 -lname ssl-cert-snakeoil.pem -delete > /dev/null 2>&1 || true
	if dpkg-statoverride --list /etc/ssl/private 2>&1 | grep -q "root ssl-cert 710"
	then
		dpkg-statoverride --remove /etc/ssl/private
		# /etc/ssl/private is also in package openssl, change permissions back
		# if not
		if [ -e /etc/ssl/private ] ; then
			chgrp root /etc/ssl/private
			chmod 700 /etc/ssl/private
				
		fi
	fi
	# if openssl conffiles are not there (i.e purged), try to delete dirs
	if [ ! -e /etc/ssl/openssl.cnf ] ; then
		rmdir /etc/ssl/private /etc/ssl/certs /etc/ssl 2> /dev/null || true
	fi
fi
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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