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#!/bin/sh
#to be trusted by other host��and no password needed when use ssh command
#check parameters legality
logfile=/var/log/trustme.log
function print_log
{
local promt="$1"
echo -e "$promt"
echo -e "`date -d today +"%Y-%m-%d %H:%M:%S"` $promt" >> $logfile
}
ip=$1
passwd=$2
if [ -z $passwd ]; then
print_log "Usage: `basename $0` ipaddr passwd"
exit 1
fi
rpm -qi sshpass >/dev/null
if [ $? != 0 ]; then
print_log "Please install sshpass first"
exit 1
fi
#ping other host
unreachable=`ping $ip -c 1 -W 3 | grep -c "100% packet loss"`
if [ $unreachable -eq 1 ]; then
print_log "host $ip is unreachable"
exit 1
fi
#generate ssh pubkey
if [ ! -e ~/.ssh/id_dsa.pub ]; then
print_log "generating ssh public key ..."
ssh-keygen -t dsa -f /root/.ssh/id_dsa -N "" <<EOF
n
EOF
if [ $? != 0 ]; then
print_log "ssh-keygen failed"
exit 1
fi
fi
#clear old public key
user=`whoami`
host=`hostname`
keyend="$user@$host"
print_log "my keyend = $keyend"
cmd="sed '/$keyend$/d' -i ~/.ssh/authorized_keys"
print_log "clear my old pub key on $local_host ..."
ssh-keygen -f "/root/.ssh/known_hosts" -R $ip
if [ $? != 0 ]; then
print_log "delete pub key of $ip from known_hosts failed"
exit 1
fi
sshpass -p $passwd ssh -o StrictHostKeyChecking=no $ip "mkdir -p ~/.ssh && touch ~/.ssh/authorized_keys"
if [ $? != 0 ]; then
print_log "ssh $ip to create file authorized_keys failed"
exit 1
fi
sshpass -p $passwd ssh -o StrictHostKeyChecking=no $ip "$cmd"
if [ $? != 0 ]; then
print_log "ssh $ip to edit authorized_keys failed"
exit 1
fi
#copy new public key
print_log "copy my public key to $ip ..."
tmpfile=/tmp/`hostname`.key.pub
sshpass -p $passwd scp -o StrictHostKeyChecking=no ~/.ssh/id_dsa.pub $ip:$tmpfile
if [ $? != 0 ]; then
print_log "scp file to $ip failed"
exit 1
fi
#copy public key to authorized_keys
print_log "on $ip, append my public key to ~/.ssh/authorized_keys ..."
sshpass -p $passwd ssh -o StrictHostKeyChecking=no $ip "cat $tmpfile >> ~/.ssh/authorized_keys"
if [ $? != 0 ]; then
print_log "ssh $ip to add public key for authorized_keys failed"
exit 1
fi
print_log "rm tmp file $ip:$tmpfile"
sshpass -p $passwd ssh -o StrictHostKeyChecking=no $ip "rm $tmpfile"
if [ $? != 0 ]; then
print_log "ssh $ip to delete tmp file failed"
exit 1
fi
print_log "trustme ok!"
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