add user with public key auth. (requires mkpasswd)

makeuser.sh

#!/bin/sh

USERNAME=$1
OPTIONS=$2
PASSWORD=$3
if [ -n $PASSWORD ]
then
  PASSWORD=`mkpasswd -l 10 -s 0`
fi

SSHDIR=/home/$USERNAME/.ssh
IDRSA=$SSHDIR/id_rsa
KEYDIR=./keys
PASSFILE=$KEYDIR/$USERNAME.pass
PRIVATEKEY=$KEYDIR/$USERNAME.pem
PUBLICKEY=$KEYDIR/$USERNAME.pub
TESTFILE=.useraddtest
if [ ! -e $KEYDIR ]
then
  mkdir $KEYDIR
  chmod 0700 $KEYDIR
fi

useradd $USERNAME $OPTIONS -p $PASSWORD
chage -l $USERNAME > $TESTFILE
if [ ! -s $TESTFILE ]
then
  rm -rf $TESTFILE
  exit 1
fi
rm -rf $TESTFILE

if [ ! -e $SSHDIR ]
then
  mkdir $SSHDIR
  chmod 0700 $SSHDIR
fi
ssh-keygen -t rsa -N $PASSWORD -f $IDRSA
rm -rf $PUBLICKEY
echo $PASSWORD > $PASSFILE
mv $IDRSA $PRIVATEKEY
mv $IDRSA.pub $PUBLICKEY
cat $PUBLICKEY >> $SSHDIR/authorized_keys
chown -R $USERNAME:$USERNAME $SSHDIR
chmod 0400 $SSHDIR/*
if [ ! -e $PUBLICKEY ]
then
  exit 1
fi

echo ""
echo "############ created new user ############"
echo "username: ${USERNAME}"
echo "password file: ${PASSFILE}"
echo "private key: ${PRIVATEKEY}"
echo "public key: ${PUBLICKEY}"
echo "##########################################"
echo ""