#!/usr/bin/env bash

script_dir="$(dirname $(realpath $0))"
conf_file=${script_dir}/conf/install_openvpn.conf

_needed_debian_packages="openvpn easy-rsa"

# - Used if system does NOT support systemd
# -
init_script="/etc/init.d/openvpn"

# - Used if systemd is supported
# -
service_name=openvpn

openvpn_binary="/usr/sbin/openvpn"

log_file="$(mktemp)"
_date="$(date +%Y-%m-%d-%H%M)"

#---------------------------------------
#-----------------------------
# Base Function(s)
#-----------------------------
#---------------------------------------
clean_up() {

   # Perform program exit housekeeping
   rm $log_file
   exit $1
}

echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo -e -n "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}

fatal(){
   echo ""
   echo -e "\t[ \033[31m\033[1mFatal\033[m ]: $*"
   echo ""
   echo -e "\t\033[37m\033[1mInstalllation will be interrupted\033[m\033[m"
   echo ""
   clean_up 1
   exit 1
}

error(){
   echo ""
   echo -e "\t[ \033[31m\033[1mError\033[m ]: $*"
   echo ""
}

warn (){
   echo ""
   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
   echo ""
}

info (){
   echo ""
   echo -e "\t[ \033[32m\033[1mInfo\033[m ]: $*"
   echo ""
}

echo_done() {
   echo -e "\033[80G[ \033[32mdone\033[m ]"
}
echo_ok() {
   echo -e "\033[80G[ \033[32mok\033[m ]"
}
echo_warning() {
   echo -e "\033[80G[ \033[33m\033[1mwarn\033[m ]"
}
echo_failed(){
   echo -e "\033[80G[ \033[1;31mfailed\033[m ]"
}
echo_skipped() {
   echo -e "\033[80G[ \033[37mskipped\033[m ]"
}

trap clean_up SIGHUP SIGINT SIGTERM

#---------------------------------------
#-----------------------------
# Check some prerequisites
#-----------------------------
#---------------------------------------

# - Is 'systemd' supported on this system
# -
systemd=$(which systemd)
systemctl=$(which systemctl)

systemd_supported=false
if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
   systemd_supported=true
else
   if [[ ! -x $init_script ]]; then
      fatal "$(basename $0): Missing OpenVPN Init-Script!"
   fi
fi



echo ""

#---------------------------------------
#-----------------------------
# Read Configurations from $conf_file
#-----------------------------
#---------------------------------------

echononl "   Load configuration file.."
if [[ ! -f "$conf_file" ]]; then
   echo_failed
   fatal "Configuration file \033[37m\033[1m$(basename ${conf_file})\033[m not found!"
else
   source "${conf_file}" 
   if [[ $? -eq 0 ]]; then
      echo_ok
   else
      echo_failed
      fatal "$(cat $log_file)"
   fi
fi


#---------------------------------------
#-----------------------------
# Start Installation
#-----------------------------
#---------------------------------------

check_string_ps=""
check_string_ps_plus=""
if [[ -f "$openvpn_binary" ]] ; then
   check_string_ps="$openvpn_binary"
   check_string_ps_plus="--daemon"
fi


if [[ -n "$check_string_ps" ]]; then
   echononl "   Stopping OpenVPN Daemon"
   PID=$(ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}" | grep "\ ${check_string_ps_plus}\ " | grep -v grep | awk '{print$2}')
   if [[ "X${PID}" = "X" ]]; then
      echo_skipped
   else
      if $systemd_supported ; then
         $systemctl stop $service_name > "$log_file" 2>&1
         if [[ $? -ne 0 ]]; then
            echo_failed
            error "$(cat $log_file)"
         else
            echo_ok
         fi
      else
         $init_script stop > "$log_file" 2>&1 
         if [[ $? -ne 0 ]]; then
            echo_failed
            error "$(cat $log_file)"
         else
            echo_ok
         fi
      fi
   fi
fi


# - Install needed debian packages
# -
echononl "   Install needed debian packages.."
needed_debian_packages=""
for _pkg in $_needed_debian_packages ; do
   if aptitude search "$_pkg" | grep " $_pkg " | grep -e "^i" > /dev/null 2>&1 ; then
      continue
   else
      needed_debian_packages="$needed_debian_packages $_pkg"
   fi
done
if [[ -n "$needed_debian_packages" ]]; then
   DEBIAN_FRONTEND=noninteractive apt-get -y install $needed_debian_packages > /dev/null 2> "$log_file"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      fatal "$(cat $log_file)"
   fi
else
   echo_skipped
fi

# - Make the package included scripts available in directory
# - "/etc/openvpn/easy-rsa"
# -
echononl "   Backup directory '${EASY_RSA_DIR}'.."
if [[ -d "$EASY_RSA_DIR" ]]; then
   mv $EASY_RSA_DIR ${EASY_RSA_DIR}.$_date > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi
echononl "   Create directory '${EASY_RSA_DIR}'.."
/usr/bin/make-cadir $EASY_RSA_DIR > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Create key directory
# -
echononl "   Backup key directory '${OPENVPN_BASE_DIR}/keys'.."
if [[ -d "${OPENVPN_BASE_DIR}/keys" ]]; then
   mv ${OPENVPN_BASE_DIR}/keys ${OPENVPN_BASE_DIR}/keys.$_date > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi
echononl "   Create key directory '${OPENVPN_BASE_DIR}/keys'.."
mkdir ${OPENVPN_BASE_DIR}/keys > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi
echononl "   Change permissions (700) in directory '${OPENVPN_BASE_DIR}/keys'.."
chmod 700 "${OPENVPN_BASE_DIR}/keys" > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Create Log Directory
# -
openvpn_log_dir="/var/log/openvpn"
echononl "   Create log directoy '${openvpn_log_dir}'"
if [[ -d "${openvpn_log_dir}" ]] ; then
   echo_skipped
else
   mkdir /var/log/openvpn > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
fi


# - Backup existing 'ccd' directory
# -
echononl "   Backup directory '${OPENVPN_BASE_DIR}/ccd'.."
if [[ -d "${OPENVPN_BASE_DIR}/ccd" ]] ; then
   mv "${OPENVPN_BASE_DIR}/ccd" "${OPENVPN_BASE_DIR}/ccd.${_date}" > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

# - Create Directory 'ccd'
# -
echononl "   Create log directoy '${OPENVPN_BASE_DIR}/ccd'"
if [[ -d "${OPENVPN_BASE_DIR}/ccd" ]] ; then
   echo_skipped
else
   mkdir "${OPENVPN_BASE_DIR}/ccd" > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
fi

# - Backup file keys-created.txt
# -
echononl "   Backup file '${OPENVPN_BASE_DIR}/keys-created.txt"
if [[ -f "${OPENVPN_BASE_DIR}/keys-created.txt" ]]; then
   mv "${OPENVPN_BASE_DIR}/keys-created.txt" "${OPENVPN_BASE_DIR}/keys-created.txt.${_date}" > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi


# - Adjust /etc/default/openvpn
# -
# -    AUTOSTART="all"
# -
_file="/etc/default/openvpn"
echononl "   Adjust '/etc/default/openvpn'. Set AUTOSTART=\"all\""
if ! grep -i -q -E "^\s*AUTOSTART=\"all\"" ${_file} ; then
   if grep -i -q -E "^\s*#\s*AUTOSTART=\"all\"" ${_file} ; then
      perl -i -n -p -e "s/^(\s*#\s*AUTOSTART=\"all\".*)/##\1\nAUTOSTART=\"all\"/" ${_file} > "$log_file" 2>&1
      if [[ $? -eq 0 ]] ; then
         echo_ok
      else
         echo_failed
         error "$(cat $log_file)"
      fi
   else
      echo "" >> ${_file}
      echo "AUTOSTART=\"all\"" >> ${_file}
      if [[ $? -eq 0 ]] ; then
         echo_ok
      else
         echo_failed
         error "$(cat $log_file)"
      fi
   fi
else
   echo_skipped
fi

# - Adjust /etc/openvpn/easy-rsa/vars
# -
# -    add:
# -    export BASE_DIR=$OPENVPN_BASE_DIR
# -
# -    replace:
# -    export EASY_RSA=\$BASE_DIR/easy_rsa
# -    export KEY_DIR=\$BASE_DIR/keys
# -
# -    export KEY_SIZE=$KEY_SIZE
# -
# -    # root CA expires in 30 years (= 10950 days)
# -    export CA_EXPIRE=$CA_EXPIRE
# -
# -    # certificates expires in 20 years (=7300 days)
# -    export KEY_EXPIRE=$KEY_EXPIRE
# -
# -    export KEY_COUNTRY="$KEY_COUNTRY"
# -    export KEY_PROVINCE="$KEY_PROVINCE"
# -    export KEY_CITY="$KEY_CITY"
# -    export KEY_ORG="$KEY_ORG"
# -    export KEY_EMAIL="$KEY_EMAIL"
# -    export KEY_OU="$KEY_OU"
# -
# -    export KEY_NAME="$KEY_NAME"
# -
# -    #export KEY_CN="$KEY_CN"
# -
_failed=false
echononl "   Adjust '${EASY_RSA_DIR}/vars'.."
perl -i.$_date -n -p -e "s&^(\s*#*\s*export\s+EASY_RSA=.*)&##\1\nexport BASE_DIR=\"${OPENVPN_BASE_DIR}\"\nexport EASY_RSA=\"\\\$BASE_DIR/easy-rsa\"&" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s&^(\s*#*\s*export\s+KEY_DIR=.*)&##\1\nexport KEY_DIR=\"\\\$BASE_DIR/keys\"&" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi

perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_SIZE=.*)/##\1\nexport KEY_SIZE=$KEY_SIZE/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+CA_EXPIRE=.*)/##\1\nexport CA_EXPIRE=$CA_EXPIRE/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_EXPIRE=.*)/##\1\nexport KEY_EXPIRE=$KEY_EXPIRE/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi

perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_COUNTRY=.*)/##\1\nexport KEY_COUNTRY=\"${KEY_COUNTRY}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_PROVINCE=.*)/##\1\nexport KEY_PROVINCE=\"${KEY_PROVINCE}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_CITY=.*)/##\1\nexport KEY_CITY=\"${KEY_CITY}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_ORG=.*)/##\1\nexport KEY_ORG=\"${KEY_ORG}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_EMAIL=.*)/##\1\nexport KEY_EMAIL=\"${KEY_EMAIL}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_OU=.*)/##\1\nexport KEY_OU=\"${KEY_OU}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_NAME=.*)/##\1\nexport KEY_NAME=\"${KEY_NAME}\"/" ${EASY_RSA_DIR}/vars > "$log_file"
2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi

perl -i -n -p -e "s/^(\s*#*\s*export\s+KEY_CN=.*)/#\1\nexport KEY_CN=\"${KEY_CN}\"/" ${EASY_RSA_DIR}/vars > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi

echo -e "\nexport KEY_ALTNAMES=\"$KEY_ALTNAMES\"" >> ${EASY_RSA_DIR}/vars 2> "$log_file"
if [[ $? -ne 0 ]]; then
   _failed=true
fi

if $_failed ; then
   echo_failed
   error "$(cat $log_file)"
else
   echo_ok
fi


#---------------------------------------
#-----------------------------
# Initial Setup OpenVPN (Root ca / Server key /..)
#-----------------------------
#---------------------------------------

echo ""

# - source file vars
# -
echononl "   Load configuration '${EASY_RSA_DIR}/vars'.."
source ${EASY_RSA_DIR}/vars > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi


# ---
# - Create Keys and Certs
# ---
echo ""
echo -e "\033[32m--\033[m"
echo "Create Keys and Certs .."
echo -e "\033[32m--\033[m"
echo ""

# - Create file 'serial' with value '01' - the serial for the next
# - created certificate
# -
echononl "   Create '${OPENVPN_BASE_DIR}/keys/serial'.."
echo "01" > "${OPENVPN_BASE_DIR}/keys/serial" 2> "$log_file"
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Create empty file index.txt at key-directory
# -
echononl "   Create empty file '${OPENVPN_BASE_DIR}/keys/index.txt'.."
touch $OPENVPN_BASE_DIR/keys/index.txt
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Create Root CA
# -
echononl "   Create Root CA.."
printf "\n\n\n\n\n\n\n\n" | ${EASY_RSA_DIR}/build-ca > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Build Diffie-Hellman parameters for the server side
# - of an SSL/TLS connection.
# .
echononl "   Build Diffie-Hellman parameter (dh key).."
${EASY_RSA_DIR}/build-dh > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Build Sever Key
# -
#echononl "   Create Sever Key"
echo ""
echo -e "   \033[32mNow create the server key. Tis procedure works interactive.\033[m"
echo -e "      Use \033[37m\033[1m${KEY_CN}-server\033[m as commonName"
echo ""
echononl "Type <return> to continue: "
read ok
echo ""

${EASY_RSA_DIR}/build-key-server server
if [[ $? -eq 0 ]] ; then
   info "Building server key was successfully."
else
   error "Building server key failed!"
fi

echo ""
echononl "Type <return> to continue: "
read ok
echo ""
#printf "\n\n\n\n\n${KEY_CN}-server\n\n\n\ny\ny\n" | ${EASY_RSA_DIR}/build-key-server server

# - For extra security beyond that provided
# - by SSL/TLS, create an "HMAC firewall"
# - to help block DoS attacks and UDP port flooding.
# -
echononl "   Create 'ta.key' for additional security"
openvpn --genkey --secret ${OPENVPN_BASE_DIR}/keys/ta.key > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

# - Create empty CRL (Certificate Revokation List)
# -
echononl "   Create CRL (Certificate Revokation List) '${OPENVPN_BASE_DIR}/crl.pem'.."
openssl ca -gencrl -out /etc/openvpn/crl.pem -config $KEY_CONFIG > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

echononl "   Create symlink for '${OPENVPN_BASE_DIR}/keys/crl.pem'.."
ln -s ../crl.pem /etc/openvpn/keys/crl.pem > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi


# ----
# - Create server configurations
# ----

echo ""
echo -e "\033[32m--\033[m"
echo "Server configurations .."
echo -e "\033[32m--\033[m"
echo ""

echononl "   Backup Client configuration directory '$CCD_HOME'"
if [[ -d "$CCD_HOME" ]]; then
   mv "$CCD_HOME" "${CCD_HOME}.$_date"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi


echononl "   Create Client configuration directory '$CCD_HOME'"
mkdir "$CCD_HOME" > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

echononl "   Backup file ${OPENVPN_BASE_DIR}/server-home.conf"
if [[ -f "${OPENVPN_BASE_DIR}/server-home.conf" ]] ; then
   mv "${OPENVPN_BASE_DIR}/server-home.conf" "${OPENVPN_BASE_DIR}/server-home.conf.$_date" > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

echononl "   Create configuration '${OPENVPN_BASE_DIR}/server-home.conf"
cat <<EOF > ${OPENVPN_BASE_DIR}/server-home.conf 2> "$log_file"
#################################################
# Sample OpenVPN 2.0 config file for            #
# multi-client server.                          #
#                                               #
# This file is for the server side              #
# of a many-clients <-> one-server              #
# OpenVPN configuration.                        #
#                                               #
# OpenVPN also supports                         #
# single-machine <-> single-machine             #
# configurations (See the Examples page         #
# on the web site for more info).               #
#                                               #
# This config should work on Windows            #
# or Linux/BSD systems.  Remember on            #
# Windows to quote pathnames and use            #
# double backslashes, e.g.:                     #
# "C:\\Program Files\\OpenVPN\\config\\foo.key" #
#                                               #
# Comments are preceded with '#' or ';'         #
#################################################

# Which local IP address should OpenVPN
# listen on? (optional)
;local a.b.c.d

# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one.  You will need to
# open up this port on your firewall.
port $SERVER_PORT_HOME

# TCP or UDP server?
;proto tcp
proto udp


topology subnet
#route 192.168.63.0 255.255.255.0 10.1.72.1
#route 192.168.64.0 255.255.255.0 10.1.72.1

# "dev tun" will create a routed IP tunnel,
# "dev tap" will create an ethernet tunnel.
# Use "dev tap" if you are ethernet bridging.
# If you want to control access policies
# over the VPN, you must create firewall
# rules for the the TUN/TAP interface.
# On non-Windows systems, you can give
# an explicit unit number, such as tun0.
# On Windows, use "dev-node" for this.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel if you
# have more than one.  On XP SP2 or higher,
# you may need to selectively disable the
# Windows firewall for the TAP adapter.
# Non-Windows systems usually don't need this.
;dev-node MyTap

# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key).  Each client
# and the server must have their own cert and
# key file.  The server and all clients will
# use the same ca file.
#
# See the "easy-rsa" directory for a series
# of scripts for generating RSA certificates
# and private keys.  Remember to use
# a unique Common Name for the server
# and each of the client certificates.
#
# Any X509 key management system can be used.
# OpenVPN can also use a PKCS #12 formatted key file
# (see "pkcs12" directive in man page).
ca ${OPENVPN_BASE_DIR}/keys/ca.crt
cert ${OPENVPN_BASE_DIR}/keys/server.crt
key ${OPENVPN_BASE_DIR}/keys/server.key  # This file should be kept secret

# Diffie hellman parameters.
# Generate your own with:
#   openssl dhparam -out dh1024.pem 1024
# Substitute 2048 for 1024 if you are using
# 2048 bit keys.
dh ${OPENVPN_BASE_DIR}/keys/dh2048.pem

# Configure server mode and supply a VPN subnet
# for OpenVPN to draw client addresses from.
# The server will take 10.8.0.1 for itself,
# the rest will be made available to clients.
# Each client will be able to reach the server
# on 10.8.0.1. Comment this line out if you are
# ethernet bridging. See the man page for more info.
server $OPENVPN_NETWORK_HOME 255.255.255.0

# Maintain a record of client <-> virtual IP address
# associations in this file.  If OpenVPN goes down or
# is restarted, reconnecting clients can be assigned
# the same virtual IP address from the pool that was
# previously assigned.
ifconfig-pool-persist /etc/openvpn/ipp.txt

# Configure server mode for ethernet bridging.
# You must first use your OS's bridging capability
# to bridge the TAP interface with the ethernet
# NIC interface.  Then you must manually set the
# IP/netmask on the bridge interface, here we
# assume 10.8.0.4/255.255.255.0.  Finally we
# must set aside an IP range in this subnet
# (start=10.8.0.50 end=10.8.0.100) to allocate
# to connecting clients.  Leave this line commented
# out unless you are ethernet bridging.
;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

# Push routes to the client to allow it
# to reach other private subnets behind
# the server.  Remember that these
# private subnets will also need
# to know to route the OpenVPN client
# address pool (10.8.0.0/255.255.255.0)
# back to the OpenVPN server.
;push "route 10.8.0.0  255.255.255.0"
push "route $MAIN_NETWORK 255.255.255.0"

# To assign specific IP addresses to specific
# clients or if a connecting client has a private
# subnet behind it that should also have VPN access,
# use the subdirectory "ccd" for client-specific
# configuration files (see man page for more info).

client-config-dir $CCD_HOME

# ---
# EXAMPLE: Suppose the client
# having the certificate common name "Thelonious"
# also has a small subnet behind his connecting
# machine, such as 192.168.40.128/255.255.255.248.
# First, uncomment out these lines:
;client-config-dir /etc/openvpn/ccd
;route 192.168.40.128 255.255.255.248

# Then create a file ccd/Thelonious with this line:
#   iroute 192.168.40.128 255.255.255.248
# This will allow Thelonious' private subnet to
# access the VPN.  This example will only work
# if you are routing, not bridging, i.e. you are
# using "dev tun" and "server" directives.
# ---

# ---
# EXAMPLE: Suppose you want to give
# Thelonious a fixed VPN IP address of 10.9.0.1.
# First uncomment out these lines:
;client-config-dir ccd
;route 10.9.0.0 255.255.255.252

# Then add this line to ccd/Thelonious:
#   ifconfig-push 10.9.0.1 10.9.0.2
# ---

# ---
# Suppose that you want to enable different
# firewall access policies for different groups
# of clients.  There are two methods:
# (1) Run multiple OpenVPN daemons, one for each
#     group, and firewall the TUN/TAP interface
#     for each group/daemon appropriately.
# (2) (Advanced) Create a script to dynamically
#     modify the firewall in response to access
#     from different clients.  See man
#     page for more info on learn-address script.
;learn-address ./script
# ---

# If enabled, this directive will configure
# all clients to redirect their default
# network gateway through the VPN, causing
# all IP traffic such as web browsing and
# and DNS lookups to go through the VPN
# (The OpenVPN server machine may need to NAT
# the TUN/TAP interface to the internet in
# order for this to work properly).
# CAVEAT: May break client's network config if
# client's local DHCP server packets get routed
# through the tunnel.  Solution: make sure
# client's local DHCP server is reachable via
# a more specific route than the default route
# of 0.0.0.0/0.0.0.0.
;push "redirect-gateway"

# Certain Windows-specific network settings
# can be pushed to clients, such as DNS
# or WINS server addresses.  CAVEAT:
# http://openvpn.net/faq.html#dhcpcaveats
;push "dhcp-option WINS 10.8.0.1"
push "dhcp-option DNS ${DNS_SERVER}"
push "dhcp-option DOMAIN ${DOMAIN}"

# Uncomment this directive to allow different
# clients to be able to "see" each other.
# By default, clients will only see the server.
# To force clients to only see the server, you
# will also need to appropriately firewall the
# server's TUN/TAP interface.
client-to-client

# Uncomment this directive if multiple clients
# might connect with the same certificate/key
# files or common names.  This is recommended
# only for testing purposes.  For production use,
# each client should have its own certificate/key
# pair.
#
# IF YOU HAVE NOT GENERATED INDIVIDUAL
# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,
# EACH HAVING ITS OWN UNIQUE "COMMON NAME",
# UNCOMMENT THIS LINE OUT.
;duplicate-cn

# The keepalive directive causes ping-like
# messages to be sent back and forth over
# the link so that each side knows when
# the other side has gone down.
# Ping every 10 seconds, assume that remote
# peer is down if no ping received during
# a 120 second time period.
keepalive 10 120

# For extra security beyond that provided
# by SSL/TLS, create an "HMAC firewall"
# to help block DoS attacks and UDP port flooding.
#
# Generate with:
#   openvpn --genkey --secret ta.key
#
# The server and each client must have
# a copy of this key.
# The second parameter should be '0'
# on the server and '1' on the clients.
;tls-auth ta.key 0 # This file is secret
tls-auth ${OPENVPN_BASE_DIR}/keys/ta.key 0

# Select a cryptographic cipher.
# This config item must be copied to
# the client config file as well.
;cipher BF-CBC        # Blowfish (default)
;cipher AES-128-CBC   # AES
;cipher DES-EDE3-CBC  # Triple-DES
cipher AES-256-CBC

# Enable compression on the VPN link.
# If you enable it here, you must also
# enable it in the client config file.
comp-lzo

# The maximum number of concurrently connected
# clients we want to allow.
;max-clients 100

# It's a good idea to reduce the OpenVPN
# daemon's privileges after initialization.
#
# You can uncomment this out on
# non-Windows systems.
user nobody
group nogroup

# The persist options will try to avoid
# accessing certain resources on restart
# that may no longer be accessible because
# of the privilege downgrade.
persist-key
persist-tun
persist-local-ip
persist-remote-ip

# Output a short status file showing
# current connections, truncated
# and rewritten every minute.
status /var/log/openvpn/status-server-home.log
# By default, log messages will go to the syslog (or
# on Windows, if running as a service, they will go to
# the "\Program Files\OpenVPN\log" directory).
# Use log or log-append to override this default.
# "log" will truncate the log file on OpenVPN startup,
# while "log-append" will append to it.  Use one
# or the other (but not both).
log         /var/log/openvpn/server-home.log
;log-append  openvpn.log

# Set the appropriate level of log
# file verbosity.
#
# 0 is silent, except for fatal errors
# 4 is reasonable for general usage
# 5 and 6 can help to debug connection problems
# 9 is extremely verbose
verb 4

# Silence repeating messages.  At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20

# CRL (certificate revocation list) verification
crl-verify ${OPENVPN_BASE_DIR}/crl.pem

EOF
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

echo ""

echononl "   Backup Client configuration directory '$CCD_GW_CKUBU'"
if [[ -d "$CCD_GW_CKUBU" ]]; then
   mv "$CCD_GW_CKUBU" "${CCD_GW_CKUBU}.$_date"
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi


echononl "   Create Client configuration directory '$CCD_HOME'"
mkdir "$CCD_GW_CKUBU" > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

echononl "   Backup file ${OPENVPN_BASE_DIR}/server-gw-ckubu.conf"
if [[ -f "${OPENVPN_BASE_DIR}/server-gw-ckubu.conf" ]]; then
   mv "${OPENVPN_BASE_DIR}/server-gw-ckubu.conf" "${OPENVPN_BASE_DIR}/server-gw-ckubu.conf.$_date" > "$log_file" 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

echononl "   Create configuration '${OPENVPN_BASE_DIR}/erver-gw-ckubu.conf"
cat <<EOF > ${OPENVPN_BASE_DIR}/server-gw-ckubu.conf 2> "$log_file"
#################################################
# Sample OpenVPN 2.0 config file for            #
# multi-client server.                          #
#                                               #
# This file is for the server side              #
# of a many-clients <-> one-server              #
# OpenVPN configuration.                        #
#                                               #
# OpenVPN also supports                         #
# single-machine <-> single-machine             #
# configurations (See the Examples page         #
# on the web site for more info).               #
#                                               #
# This config should work on Windows            #
# or Linux/BSD systems.  Remember on            #
# Windows to quote pathnames and use            #
# double backslashes, e.g.:                     #
# "C:\\Program Files\\OpenVPN\\config\\foo.key" #
#                                               #
# Comments are preceded with '#' or ';'         #
#################################################

# Which local IP address should OpenVPN
# listen on? (optional)
;local a.b.c.d

# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one.  You will need to
# open up this port on your firewall.
port $SERVER_PORT_GW_CKUBU

# TCP or UDP server?
;proto tcp
proto udp


topology subnet
route 192.168.63.0 255.255.255.0 $IPV4_OPENVPN_GW_CKUBU
route 192.168.64.0 255.255.255.0 $IPV4_OPENVPN_GW_CKUBU

# "dev tun" will create a routed IP tunnel,
# "dev tap" will create an ethernet tunnel.
# Use "dev tap" if you are ethernet bridging.
# If you want to control access policies
# over the VPN, you must create firewall
# rules for the the TUN/TAP interface.
# On non-Windows systems, you can give
# an explicit unit number, such as tun0.
# On Windows, use "dev-node" for this.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel if you
# have more than one.  On XP SP2 or higher,
# you may need to selectively disable the
# Windows firewall for the TAP adapter.
# Non-Windows systems usually don't need this.
;dev-node MyTap

# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key).  Each client
# and the server must have their own cert and
# key file.  The server and all clients will
# use the same ca file.
#
# See the "easy-rsa" directory for a series
# of scripts for generating RSA certificates
# and private keys.  Remember to use
# a unique Common Name for the server
# and each of the client certificates.
#
# Any X509 key management system can be used.
# OpenVPN can also use a PKCS #12 formatted key file
# (see "pkcs12" directive in man page).
ca keys/ca.crt
cert keys/server.crt
key keys/server.key  # This file should be kept secret

# Diffie hellman parameters.
# Generate your own with:
#   openssl dhparam -out dh1024.pem 1024
# Substitute 2048 for 1024 if you are using
# 2048 bit keys.
dh keys/dh2048.pem

# Configure server mode and supply a VPN subnet
# for OpenVPN to draw client addresses from.
# The server will take 10.8.0.1 for itself,
# the rest will be made available to clients.
# Each client will be able to reach the server
# on 10.8.0.1. Comment this line out if you are
# ethernet bridging. See the man page for more info.
server $OPENVPN_NETWORK_GW_CKUBU 255.255.255.0

# Maintain a record of client <-> virtual IP address
# associations in this file.  If OpenVPN goes down or
# is restarted, reconnecting clients can be assigned
# the same virtual IP address from the pool that was
# previously assigned.
ifconfig-pool-persist /etc/openvpn/ipp.txt

# Configure server mode for ethernet bridging.
# You must first use your OS's bridging capability
# to bridge the TAP interface with the ethernet
# NIC interface.  Then you must manually set the
# IP/netmask on the bridge interface, here we
# assume 10.8.0.4/255.255.255.0.  Finally we
# must set aside an IP range in this subnet
# (start=10.8.0.50 end=10.8.0.100) to allocate
# to connecting clients.  Leave this line commented
# out unless you are ethernet bridging.
;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

# Push routes to the client to allow it
# to reach other private subnets behind
# the server.  Remember that these
# private subnets will also need
# to know to route the OpenVPN client
# address pool (10.8.0.0/255.255.255.0)
# back to the OpenVPN server.
;push "route 10.8.0.0  255.255.255.0"
push "route $MAIN_NETWORK 255.255.255.0"

# To assign specific IP addresses to specific
# clients or if a connecting client has a private
# subnet behind it that should also have VPN access,
# use the subdirectory "ccd" for client-specific
# configuration files (see man page for more info).

client-config-dir $CCD_GW_CKUBU

# ---
# EXAMPLE: Suppose the client
# having the certificate common name "Thelonious"
# also has a small subnet behind his connecting
# machine, such as 192.168.40.128/255.255.255.248.
# First, uncomment out these lines:
;client-config-dir /etc/openvpn/ccd
;route 192.168.40.128 255.255.255.248

# Then create a file ccd/Thelonious with this line:
#   iroute 192.168.40.128 255.255.255.248
# This will allow Thelonious' private subnet to
# access the VPN.  This example will only work
# if you are routing, not bridging, i.e. you are
# using "dev tun" and "server" directives.
# ---

# ---
# EXAMPLE: Suppose you want to give
# Thelonious a fixed VPN IP address of 10.9.0.1.
# First uncomment out these lines:
;client-config-dir ccd
;route 10.9.0.0 255.255.255.252

# Then add this line to ccd/Thelonious:
#   ifconfig-push 10.9.0.1 10.9.0.2
# ---

# ---
# Suppose that you want to enable different
# firewall access policies for different groups
# of clients.  There are two methods:
# (1) Run multiple OpenVPN daemons, one for each
#     group, and firewall the TUN/TAP interface
#     for each group/daemon appropriately.
# (2) (Advanced) Create a script to dynamically
#     modify the firewall in response to access
#     from different clients.  See man
#     page for more info on learn-address script.
;learn-address ./script
# ---

# If enabled, this directive will configure
# all clients to redirect their default
# network gateway through the VPN, causing
# all IP traffic such as web browsing and
# and DNS lookups to go through the VPN
# (The OpenVPN server machine may need to NAT
# the TUN/TAP interface to the internet in
# order for this to work properly).
# CAVEAT: May break client's network config if
# client's local DHCP server packets get routed
# through the tunnel.  Solution: make sure
# client's local DHCP server is reachable via
# a more specific route than the default route
# of 0.0.0.0/0.0.0.0.
;push "redirect-gateway"

# Certain Windows-specific network settings
# can be pushed to clients, such as DNS
# or WINS server addresses.  CAVEAT:
# http://openvpn.net/faq.html#dhcpcaveats
;push "dhcp-option WINS 10.8.0.1"

# - Do NOT push DNS settings in THIS configuration. We use
# - this VPN tunnel as a static line, and the remote host
# - should user his own dns settings.
# -
;push "dhcp-option DNS ${DNS_SERVER}"
;push "dhcp-option DOMAIN ${DOMAIN}"

# Uncomment this directive to allow different
# clients to be able to "see" each other.
# By default, clients will only see the server.
# To force clients to only see the server, you
# will also need to appropriately firewall the
# server's TUN/TAP interface.
client-to-client

# Uncomment this directive if multiple clients
# might connect with the same certificate/key
# files or common names.  This is recommended
# only for testing purposes.  For production use,
# each client should have its own certificate/key
# pair.
#
# IF YOU HAVE NOT GENERATED INDIVIDUAL
# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,
# EACH HAVING ITS OWN UNIQUE "COMMON NAME",
# UNCOMMENT THIS LINE OUT.
;duplicate-cn

# The keepalive directive causes ping-like
# messages to be sent back and forth over
# the link so that each side knows when
# the other side has gone down.
# Ping every 10 seconds, assume that remote
# peer is down if no ping received during
# a 120 second time period.
keepalive 10 120

# For extra security beyond that provided
# by SSL/TLS, create an "HMAC firewall"
# to help block DoS attacks and UDP port flooding.
#
# Generate with:
#   openvpn --genkey --secret ta.key
#
# The server and each client must have
# a copy of this key.
# The second parameter should be '0'
# on the server and '1' on the clients.
;tls-auth ta.key 0 # This file is secret
tls-auth keys/ta.key 0

# Select a cryptographic cipher.
# This config item must be copied to
# the client config file as well.
;cipher BF-CBC        # Blowfish (default)
;cipher AES-128-CBC   # AES
;cipher DES-EDE3-CBC  # Triple-DES
cipher AES-256-CBC

# Enable compression on the VPN link.
# If you enable it here, you must also
# enable it in the client config file.
comp-lzo

# The maximum number of concurrently connected
# clients we want to allow.
;max-clients 100

# It's a good idea to reduce the OpenVPN
# daemon's privileges after initialization.
#
# You can uncomment this out on
# non-Windows systems.
user nobody
group nogroup

# The persist options will try to avoid
# accessing certain resources on restart
# that may no longer be accessible because
# of the privilege downgrade.
persist-key
persist-tun
persist-local-ip
persist-remote-ip

# Output a short status file showing
# current connections, truncated
# and rewritten every minute.
status /var/log/openvpn/status-server-gw-ckubu.log

# By default, log messages will go to the syslog (or
# on Windows, if running as a service, they will go to
# the "\Program Files\OpenVPN\log" directory).
# Use log or log-append to override this default.
# "log" will truncate the log file on OpenVPN startup,
# while "log-append" will append to it.  Use one
# or the other (but not both).
log         /var/log/openvpn/server-gw-ckubu.log
;log-append  openvpn.log

# Set the appropriate level of log
# file verbosity.
#
# 0 is silent, except for fatal errors
# 4 is reasonable for general usage
# 5 and 6 can help to debug connection problems
# 9 is extremely verbose
verb 4

# Silence repeating messages.  At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20

#crl-verify /etc/openvpn/keys/crl.pem
crl-verify /etc/openvpn/crl.pem
EOF
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi


# - Start OpenVPN Service
# -
echononl "   Start OpenVPN Service"
if $systemd_supported ; then
   $systemctl start $service_name > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   $init_script start > "$log_file" 2>&1 
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
fi


# - See if OpenVPN Service is running/has started
# 
check_string_ps="$openvpn_binary"
check_string_ps_plus="--daemon"
sleep 2
PID=$(ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}" | grep "\ ${check_string_ps_plus}\ " | grep -v grep | awk '{print$2}')
if [[ "X${PID}" = "X" ]]; then
   warn "\033[37m\033[1mOpenVPN Service is NOT running.\033[m\n                     Maybe you have to restart the machine in order to start openvpn daemon."
fi




echo ""
clean_up