Add ssh user to system and generate RSA keypair

addssh.sh

#!/bin/bash

# --------------------
# arguments definition
# --------------------

V_USER=$1
V_PASSWORD=$(openssl rand -base64 12)

# -------------
# verifications
# -------------

if [ -z "$V_USER" ]; then
    echo "Not enough parameters."
    echo -e "Usage: "
    echo -e " \t ${0##*/} username"
    exit 1
fi

check_sysuser=$(cut -f 1 -d : /etc/passwd | grep "^$V_USER$" )
if [ ! -z "$check_sysuser" ]; then
    echo "user $V_USER already exists"
    exit 1
fi

# --------
# actions
# --------

/usr/sbin/useradd -p $(openssl passwd ${V_PASSWORD}) ${V_USER}
echo "${V_USER} ALL=(ALL) NOPASSWD:ALL" | tee -a /etc/sudoers
mkdir /home/${V_USER}
mkdir /home/${V_USER}/.ssh
chown -R ${V_USER}:${V_USER} /home/${V_USER}
chsh -s /bin/bash "${V_USER}"
su - "${V_USER}" -c "ssh-keygen -t rsa -N '' -f ~/.ssh/id_rsa" <<<y

echo -e "------------------------------"
echo "SSH User: ${V_USER} "
echo "SSH Password: ${V_PASSWORD} "