itchy itchy

Setting up public key authentication in Linux (openssh)

#!/bin/sh
prog=`basename $0`
progdir=`dirname $0`

usage () {
        msg=$1
        cat << EOT
usage: $prog [-U <remote user>] [-h] -H <remote host>
$msg
EOT
}

while [ "$#" -gt 0 ]
do
        OPTIND=0
        getopts 'H:U:hv' NAME
        case "$NAME"
        in
                D) echo setting rhome; RHOME=$OPTARG; shift; shift;;
                U) RUSER=$OPTARG; shift; shift;;
                H) RH=$OPTARG; shift; shift;;
                v) verbose=1; shift;;
                h) usage "help called"; exit 1; shift ;;
                *) usage "Unknown arg $NAME" ; exit 1; shift;;
        esac
done

if [ -z $RH ]
then
        usage "Please specify a host."
        exit 1
fi

if [ -z $RUSER ]
then
        RUSER=$USER
fi

cd $HOME
if [ ! -d .ssh ]
then
        mkdir .ssh
fi
chmod 700 .ssh

cd .ssh
if [ ! -e id_dsa.pub ]
then
        ssh-keygen -t dsa -N "" -f $HOME/.ssh/id_dsa
fi

ssh -l $RUSER $RH "sh -c \"if [ ! -d .ssh ]; then mkdir .ssh; fi && cd
+ .ssh && if [ -e authorized_keys ] ; then cat >> authorized_keys; els
+e cat > authorized_keys; fi \"" < id_dsa.pub

ssh $RUSER@$RH hostname
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