ssh-keyput

#!/bin/bash
#
# ssh-keyput -- set up passwordless openssh login.
#
# Copyright (C) 2001, 2002, 2006 by SWsoft.
# Author: Kir Kolyshkin
# Minor changes: 2006, Alexander Saltanov
#
# This script is used to put your public ssh keys to another host's
# authorized_keys[2], so you will be able to ssh login without entering
# a password. Key pairs are generated if needed, and connectivity
# is checked after putting the keys.

# Creates a new ssh key, using the provided email as a label:
# ssh-keygen -t rsa -b 4096 -C "your_email@example.com"


PROGNAME=`basename $0`

function usage()
{
	echo "Usage: $PROGNAME [user@]IP[:port] [[user@]IP[:port] ...]" 1>&2
	exit 0
}

# Check for correct number of parameters
test $# -gt 0 || usage;

SSH_KEYGEN=`which ssh-keygen`
if test $? -ne 0; then
	# Error message is printed by 'which'
	exit 1
fi

SSH_DIR=~/.ssh
if ! test -d $SSH_DIR; then
	mkdir $SSH_DIR
fi
chmod 700 $SSH_DIR


# SSH 2
SSH2_KEY=$SSH_DIR/id_rsa
SSH2_KEY_PUB=$SSH2_KEY.pub

if [ ! -f $SSH2_KEY ] || [ ! -f $SSH2_KEY_PUB ]; then
	echo "Generating ssh2 RSA keys - please wait..."
	rm -f $SSH2_KEY $SSH2_KEY_PUB
	$SSH_KEYGEN -t rsa -b 4096  -f $SSH2_KEY -P ''
	if test $? -ne 0; then
		echo "Command \"$SSH_KEYGEN -t rsa -b 4096 -f $SSH2_KEY" "-P ''\" failed" 1>&2
		exit 1
	fi
else
	echo "ssh2 RSA key is present"
fi

SSH2_KEY=`cat $SSH2_KEY_PUB`

for IP in $*; do
	host=`echo $IP | cut -f1 -d':'`
	port=`echo $IP | cut -f2 -d':' -s`
	port_arg=""

	if [ ! -z $port ]; then
		port_arg="-p $port"
	fi

	echo "You will now be asked for password for $IP"
	ssh -oStrictHostKeyChecking=no $port_arg $host "mkdir -p ~/.ssh; chmod 700 ~/.ssh; \
		echo \"$SSH2_KEY\" >> ~/.ssh/authorized_keys; \
		chmod 600 ~/.ssh/authorized_keys ~/.ssh/authorized_keys"
	if test $? -eq 0; then
		echo "Keys were put successfully"
	else
		echo "Error putting keys to $IP" 1>&2
	fi

	for ver in 2; do
		echo -n "Checking $IP connectivity by ssh$ver... "
		ssh -q -oProtocol=${ver} -oBatchMode=yes -oStrictHostKeyChecking=no $port_arg $host /bin/true
		if [ $? -eq 0 ]; then
			echo "OK"
		else
			echo "failed" 1>&2
		fi
	done
done