[M@sprackle.org ~]$

#!/bin/bash
# AUTHOR -
# M@ - M@sprackle.org GPG Public Key ID:  0x4ADEA413
# NAME -
# sshKeyORama
# SYNOPSIS -
# ./sshKeyORama
# DESCRIPTION -
# A script to harvest all ssh public keys from a network
# REVISIONS -
# Only one published at this time.
# LIMITATIONS -
# TBD

# IP class C to scan
IPADDR='192.168.0'

# Scan the entire class C for public keys
for i in $(seq 254)
do

# Ensure that the host is live by looking up the IP in DNS.
host ${IPADDR}.$i
	if [ $? == 0 ];
	then
	# If DNS returns that the IP is listed then grab the public keys
	# You could kill the if then and just have the line below if you didn't care about dns.
	# ssh-keyscan -t rsa ${IPADDR}.$i >> ~/ssh_known_hosts
	ssh-keyscan -t rsa $(host ${IPADDR}.$i | awk '{print $5}') >> ~/ssh_known_hosts
	# This ssh_known_hosts file can be placed in /etc/ssh/ssh_known_hosts
	# every users will then get these keys in their local .ssh/known_hosts file
	fi
done