#!/bin/bash

#       A script to establish keys on a local and remote system and allow 
#       access between the two systems
#
#       usage: setup-ssh [ -u username ] hostname
#
#       $Header: /home/hugh/sources/misc/setup-ssh,v 1.3 2005/04/23 01:18:36 hugh Exp hugh $

# set -x

if [ $# -eq 0 ]
then
        echo "usage: $0 [-u username] [-lp phrase] [-rp phrase] targetsystem"
        echo "          -u username   username on remote system if not the same"
        echo "          -lp phrase    passphrase to use on local system (no spaces)"
        echo "          -rp phrase    passphrase to use on remote system (no spaces)"
        exit 1
fi

username=""
lphrase="''"
rphrase="''"

while [ $# -gt 0 ]
do
        case $1 in
                -u)     shift
                        username=$1;;
                -lp)    shift
                        lphrase=$1;;
                -rp)    shift
                        rphrase=$1;;
                 *)     hostname=$1;;
        esac
        shift
done

cd ~

rm -f /tmp/ss-temp /tmp/hmextract

cat > /tmp/hmextract <<-EOF

if [ ! -d .ssh -o ! -f .ssh/id_rsa ]
then
        ssh-keygen -q -P ${rphrase} -t rsa -f ~/.ssh/id_rsa
fi

cd .ssh
cat /tmp/tmp-id_rsa.pub >> authorized_keys
chmod 700 authorized_keys
rm -rf /tmp/tmp-id_rsa.pub
cat id_rsa.pub
cd ..
EOF

chmod +x /tmp/hmextract

if [ ! -d .ssh -o ! -f .ssh/id_rsa ]
then
        ssh-keygen -q -P ${lphrase} -t rsa -f ~/.ssh/id_rsa
fi

echo 'cat > /tmp/tmp-id_rsa.pub <<-EOF' >> /tmp/ss-temp

cat .ssh/id_rsa.pub >> /tmp/ss-temp

echo 'EOF' >> /tmp/ss-temp

cat /tmp/hmextract >> /tmp/ss-temp

if [ -n "$username" ]
then
        string="`cat /tmp/ss-temp | ssh $hostname -l $username `"
else
        string="`cat /tmp/ss-temp | ssh $hostname `"
fi

string="`echo $string | sed -e 's/^.*ssh-rsa/ssh-rsa/'`"

echo $string >> ~/.ssh/authorized_keys
chmod 700 ~/.ssh/authorized_keys

rm -f /tmp/hmextract /tmp/ss-temp