Add Sudo user, during install, with passwordless ssh access

Extra_scripts/adduser.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+# Script to add a user to Linux system
+# -------------------------------------------------------------------------
+# Copyright (c) 2007 nixCraft project <http://bash.cyberciti.biz/>
+# This script is licensed under GNU GPL version 2.0 or above
+# Comment/suggestion: <vivek at nixCraft DOT com>
+# -------------------------------------------------------------------------
+# See url for more info:
+# http://www.cyberciti.biz/tips/howto-write-shell-script-to-add-user.html
+# -------------------------------------------------------------------------
+if [ $(id -u) -eq 0 ]; then
+	read -p "Enter username : " USERNAME
+	read -s -p "Enter password : " PASSWORD
+	egrep "^$USERNAME" /etc/passwd >/dev/null
+	if [ $? -eq 0 ]; then
+		echo "$USERNAME exists!"
+		exit 1
+	else
+		pass=$(perl -e 'print crypt($ARGV[0], "password")' $PASSWORD)
+		useradd -m -p $pass $USERNAME
+		[ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
+	fi
+else
+	echo "Only root may add a user to the system"
+	exit 2
+fi
+# -------------------------------------------------------------------------
+# End script to add a user to Linux system
+# -------------------------------------------------------------------------
+
+# Add $USERNAME to SSH AllowUsers
+echo "AllowUsers $USERNAME" >> /etc/ssh/sshd_config
+
+read -s -p "Enter user publickey : " PUBLICKEY
+
+# Add  $USERNAME ssh key
+mkdir /home/$USERNAME/.ssh
+touch /home/$USERNAME/.ssh/authorized_keys
+echo $PUBLICKEY >> /home/$USERNAME/.ssh/authorized_keys
+chown -R $USERNAME:$USERNAME /home/$USERNAME/.ssh
+chmod 700 /home/$USERNAME/.ssh
+chmod 600 /home/$USERNAME/.ssh/authorized_keys
+
+# Check if adding key succeeded
+[ -f /home/$USERNAME/.ssh/authorized_keys ] && echo "Adding publickey succeeded" || echo "Adding publickey failed"
+
+sed -i "s/#AuthorizedKeysFile/AuthorizedKeysFile/g" /etc/ssh/sshd_config