#!/bin/bash

if [ "$EUID" -ne 0 ]; then
  echo "Please run as root"
  exit
fi
# ask for the domain, username, and password
read -e -p "Enter Domain name: " -i "home.johnhgaunt.com" domain
read -e -p "Enter netBIOS name: " -i "GAUNT" netbiosname
read -e -p "Enter Domain Admin username: " -i "jgaunt" username
read -e -s -p "Enter Password: " password

# get OS ditro and version
OS=$(hostnamectl | awk '/Operating System/ {print $3}')
if [ "${OS}" == "Ubuntu" ]; then
	OS_VER=$(hostnamectl | awk '/Operating System/ {print $4}')
else
	OS_VER=$(hostnamectl | awk '/Operating System/ {print $5}')
fi

# set os name and version for when the computer joins AD
echo "[active-directory]"  > /etc/realmd.conf
echo "os-name = ${OS}" >> /etc/realmd.conf
echo "os-version = ${OS_VER}" >> /etc/realmd.conf


# join the computer to the domain
if [ ${OS} == "Debian" ] || [ ${OS} == "Ubuntu" ]; then 
  echo ${password} | realm join -U ${username} --install=/ ${domain}
  echo " " >> /etc/pam.d/common-session
  echo "#oddjob-mkhomedir manual entry" >> /etc/pam.d/common-session
  echo "session optional pam_oddjob_mkhomedir.so skel=/etc/skel/ umask=0022"  >> /etc/pam.d/common-session
elif [ "${OS}" == "CentOS" ]; then  
  echo ${password} | realm join -U ${username} ${domain}
fi


# set the sssd options
# don't require the full domain for the usernames
sed --in-place 's/^use_fully_qualified_names = True/use_fully_qualified_names = False/' /etc/sssd/sssd.conf
# set home directory to /home/<username>
sed --in-place 's/^fallback_homedir = \/home\/%u@%d/fallback_homedir = \/home\/%u/' /etc/sssd/sssd.conf

# reboot sssd
systemctl restart sssd

# set the sudoers.d file for the domain admins
echo "## ${netbiosname} Admins ##"  > /etc/sudoers.d/${netbiosname}
echo "# Allow members of ${netbiosname}\Domain Admins group sudo access" >> /etc/sudoers.d/${netbiosname}
echo "%Domain\ Admins ALL=(ALL:ALL) ALL" >> /etc/sudoers.d/${netbiosname}