#!/bin/bash # Create OVPN Client # Default Variable Declarations DEFAULT="Default.txt" FILEEXT=".ovpn" CRT=".crt" KEY=".key" CA="ca.crt" TA="ta.key" INDEX="/etc/openvpn/easy-rsa/pki/index.txt" INSTALL_USER=$(cat /etc/pivpn/INSTALL_USER) helpFunc() { echo "::: Create a client ovpn profile, optional nopass" echo ":::" echo "::: Usage: pivpn <-a|add> [-n|--name <arg>] [-p|--password <arg>]|[nopass] [-d|--days <number>] [-i|--iOS] [-h|--help]" echo ":::" echo "::: Commands:" echo "::: [none] Interactive mode" echo "::: nopass Create a client without a password" echo "::: -d,--days Expire the certificate after specified number of days (default: 1080)" echo "::: -n,--name Name for the Client (default: '"$(hostname)"')" echo "::: -p,--password Password for the Client (no default)" echo "::: -i,--iOS Generate a certificate that leverages iOS keychain" echo "::: -h,--help Show this help dialog" } # Parse input arguments while test $# -gt 0 do _key="$1" case "$_key" in -n|--name|--name=*) _val="${_key##--name=}" if test "$_val" = "$_key" then test $# -lt 2 && echo "Missing value for the optional argument '$_key'." && exit 1 _val="$2" shift fi NAME="$_val" ;; -p|--password|--password=*) _val="${_key##--password=}" if test "$_val" = "$_key" then test $# -lt 2 && echo "Missing value for the optional argument '$_key'." && exit 1 _val="$2" shift fi PASSWD="$_val" ;; -d|--days|--days=*) _val="${_key##--days=}" if test "$_val" = "$_key" then test $# -lt 2 && echo "Missing value for the optional argument '$_key'." && exit 1 _val="$2" shift fi DAYS="$_val" ;; -i|--iOS) iOS=1 ;; -h|--help) helpFunc exit 0 ;; nopass) NO_PASS="1" ;; *) echo "Error: Got an unexpected argument '$1'" helpFunc exit 1 ;; esac shift done # Functions def function keynoPASS() { #Build the client key expect << EOF set timeout -1 set env(EASYRSA_CERT_EXPIRE) "${DAYS}" spawn ./easyrsa build-client-full "${NAME}" nopass expect eof EOF cd pki || exit } function keyPASS() { if [[ -z "${PASSWD}" ]]; then stty -echo while true do printf "Enter the password for the client: " read -r PASSWD printf "\n" printf "Enter the password again to verify: " read -r PASSWD2 printf "\n" [ "${PASSWD}" = "${PASSWD2}" ] && break printf "Passwords do not match! Please try again.\n" done stty echo if [[ -z "${PASSWD}" ]]; then echo "You left the password blank" echo "If you don't want a password, please run:" echo "pivpn add nopass" exit 1 fi fi if [ ${#PASSWD} -lt 4 ] || [ ${#PASSWD} -gt 1024 ] then echo "Password must be between from 4 to 1024 characters" exit 1 fi #Escape chars in PASSWD PASSWD=$(echo -n ${PASSWD} | sed -e 's/\\/\\\\/g' -e 's/\//\\\//g' -e 's/\$/\\\$/g' -e 's/!/\\!/g' -e 's/\./\\\./g' -e "s/'/\\\'/g" -e 's/"/\\"/g' -e 's/\*/\\\*/g' -e 's/\@/\\\@/g' -e 's/\#/\\\#/g' -e 's/£/\\£/g' -e 's/%/\\%/g' -e 's/\^/\\\^/g' -e 's/\&/\\\&/g' -e 's/(/\\(/g' -e 's/)/\\)/g' -e 's/-/\\-/g' -e 's/_/\\_/g' -e 's/\+/\\\+/g' -e 's/=/\\=/g' -e 's/\[/\\\[/g' -e 's/\]/\\\]/g' -e 's/;/\\;/g' -e 's/:/\\:/g' -e 's/|/\\|/g' -e 's/</\\</g' -e 's/>/\\>/g' -e 's/,/\\,/g' -e 's/?/\\?/g' -e 's/~/\\~/g' -e 's/{/\\{/g' -e 's/}/\\}/g') #Build the client key and then encrypt the key expect << EOF set timeout -1 set env(EASYRSA_CERT_EXPIRE) "${DAYS}" spawn ./easyrsa build-client-full "${NAME}" expect "Enter PEM pass phrase" { send -- "${PASSWD}\r" } expect "Verifying - Enter PEM pass phrase" { send -- "${PASSWD}\r" } expect eof EOF cd pki || exit } if [ -z "${NAME}" ]; then printf "Enter a Name for the Client: " read -r NAME fi if [[ ${NAME::1} == "." ]] || [[ ${NAME::1} == "-" ]]; then echo "Names cannot start with a dot (.) or a dash (-)." exit 1 fi if [[ "${NAME}" =~ [^a-zA-Z0-9\.\-\@\_] ]]; then echo "Name can only contain alphanumeric characters and these characters (.-@_)." exit 1 fi if [[ -z "${NAME}" ]]; then echo "You cannot leave the name blank." exit 1 fi # Check if name is already in use while read -r line || [ -n "${line}" ]; do STATUS=$(echo "$line" | awk '{print $1}') if [ "${STATUS}" == "V" ]; then CERT=$(echo "$line" | sed -e 's:.*/CN=::') if [ "${CERT}" == "${NAME}" ]; then INUSE="1" break fi fi done <${INDEX} if [ "${INUSE}" == "1" ]; then printf "\n!! This name is already in use by a Valid Certificate." printf "\nPlease choose another name or revoke this certificate first.\n" exit 1 fi # Check if name is reserved if [ "${NAME}" == "ta" ] || [ "${NAME}" == "server" ] || [ "${NAME}" == "ca" ]; then echo "Sorry, this is in use by the server and cannot be used by clients." exit 1 fi #As of EasyRSA 3.0.6, by default certificates last 1080 days, see https://github.com/OpenVPN/easy-rsa/blob/6b7b6bf1f0d3c9362b5618ad18c66677351cacd1/easyrsa3/vars.example if [ -z "${DAYS}" ]; then read -r -e -p "How many days should the certificate last? " -i 1080 DAYS fi if [[ ! "$DAYS" =~ ^[0-9]+$ ]] || [ "$DAYS" -lt 1 ] || [ "$DAYS" -gt 3650 ]; then #The CRL lasts 3650 days so it doesn't make much sense that certificates would last longer echo "Please input a valid number of days, between 1 and 3650 inclusive." exit 1 fi cd /etc/openvpn/easy-rsa || exit if [[ "${NO_PASS}" =~ "1" ]]; then if [[ -n "${PASSWD}" ]]; then echo "Both nopass and password arguments passed to the script. Please use either one." exit 1 else keynoPASS fi else keyPASS fi #1st Verify that clients Public Key Exists if [ ! -f "issued/${NAME}${CRT}" ]; then echo "[ERROR]: Client Public Key Certificate not found: $NAME$CRT" exit fi echo "Client's cert found: $NAME$CRT" #Then, verify that there is a private key for that client if [ ! -f "private/${NAME}${KEY}" ]; then echo "[ERROR]: Client Private Key not found: $NAME$KEY" exit fi echo "Client's Private Key found: $NAME$KEY" #Confirm the CA public key exists if [ ! -f "${CA}" ]; then echo "[ERROR]: CA Public Key not found: $CA" exit fi echo "CA public Key found: $CA" #Confirm the tls-auth ta key file exists if [ ! -f "${TA}" ]; then echo "[ERROR]: tls-auth Key not found: $TA" exit fi echo "tls-auth Private Key found: $TA" ## Added new step to create an .ovpn12 file that can be stored on iOS keychain ## This step is more secure method and does not require the end-user to keep entering passwords, or storing the client private cert where it can be easily tampered ## https://openvpn.net/faq/how-do-i-use-a-client-certificate-and-private-key-from-the-ios-keychain/ if [ "$iOS" = "1" ]; then #Generates the .ovpn file WITHOUT the client private key { # Start by populating with the default file cat "${DEFAULT}" #Now, append the CA Public Cert echo "<ca>" cat "${CA}" echo "</ca>" #Next append the client Public Cert echo "<cert>" sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' < "issued/${NAME}${CRT}" echo "</cert>" #Finally, append the TA Private Key if [ -f /etc/pivpn/TWO_POINT_FOUR ]; then echo "<tls-crypt>" cat "${TA}" echo "</tls-crypt>" else echo "<tls-auth>" cat "${TA}" echo "</tls-auth>" fi } > "${NAME}${FILEEXT}" # Copy the .ovpn profile to the home directory for convenient remote access printf "========================================================\n" printf "Generating an .ovpn12 file for use with iOS devices\n" printf "Please remember the export password\n" printf "as you will need this import the certificate on your iOS device\n" printf "========================================================\n" openssl pkcs12 -passin env:$PASSWD -export -in issued/${NAME}${CRT} -inkey private/${NAME}${KEY} -certfile ${CA} -name ${NAME} -out /home/$INSTALL_USER/ovpns/$NAME.ovpn12 chown "$INSTALL_USER" "/home/$INSTALL_USER/ovpns/$NAME.ovpn12" chmod 600 "/home/$INSTALL_USER/ovpns/$NAME.ovpn12" printf "========================================================\n" printf "\e[1mDone! %s successfully created!\e[0m \n" "$NAME.ovpn12" printf "You will need to transfer both the .ovpn and .ovpn12 files\n" printf "to your iOS device.\n" printf "========================================================\n\n" else #This is the standard non-iOS configuration #Ready to make a new .ovpn file { # Start by populating with the default file cat "${DEFAULT}" #Now, append the CA Public Cert echo "<ca>" cat "${CA}" echo "</ca>" #Next append the client Public Cert echo "<cert>" sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' < "issued/${NAME}${CRT}" echo "</cert>" #Then, append the client Private Key echo "<key>" cat "private/${NAME}${KEY}" echo "</key>" #Finally, append the TA Private Key if [ -f /etc/pivpn/TWO_POINT_FOUR ]; then echo "<tls-crypt>" cat "${TA}" echo "</tls-crypt>" else echo "<tls-auth>" cat "${TA}" echo "</tls-auth>" fi } > "${NAME}${FILEEXT}" fi # Copy the .ovpn profile to the home directory for convenient remote access cp "/etc/openvpn/easy-rsa/pki/$NAME$FILEEXT" "/home/$INSTALL_USER/ovpns/$NAME$FILEEXT" chown "$INSTALL_USER" "/home/$INSTALL_USER/ovpns/$NAME$FILEEXT" chmod o-r "/etc/openvpn/easy-rsa/pki/$NAME$FILEEXT" chmod o-r "/home/$INSTALL_USER/ovpns/$NAME$FILEEXT" printf "\n\n" printf "========================================================\n" printf "\e[1mDone! %s successfully created!\e[0m \n" "$NAME$FILEEXT" printf "%s was copied to:\n" "$NAME$FILEEXT" printf " /home/%s/ovpns\n" "$INSTALL_USER" printf "for easy transfer. Please use this profile only on one\n" printf "device and create additional profiles for other devices.\n" printf "========================================================\n\n"