mirror of
https://github.com/pivpn/pivpn.git
synced 2024-12-23 21:30:15 +00:00
523 lines
14 KiB
Bash
Executable file
523 lines
14 KiB
Bash
Executable file
#!/bin/bash
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# Create OVPN Client
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### Constants
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setupVars="/etc/pivpn/openvpn/setupVars.conf"
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DEFAULT="Default.txt"
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FILEEXT=".ovpn"
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CRT=".crt"
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KEY=".key"
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CA="ca.crt"
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TA="ta.key"
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INDEX="/etc/openvpn/easy-rsa/pki/index.txt"
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# shellcheck disable=SC1090
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source "${setupVars}"
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# shellcheck disable=SC2154
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userGroup="${install_user}:${install_user}"
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## Functions
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err() {
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echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $*" >&2
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}
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helpFunc() {
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echo "::: Create a client ovpn profile, optional nopass"
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echo ":::"
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echo -n "::: Usage: pivpn <-a|add> [-n|--name <arg>] "
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echo -n "[-p|--password <arg>]|[nopass] [-d|--days <number>] "
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echo "[-b|--bitwarden] [-i|--iOS] [-o|--ovpn] [-h|--help]"
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echo ":::"
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echo "::: Commands:"
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echo "::: [none] Interactive mode"
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echo "::: nopass Create a client without a password"
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echo -n "::: -n,--name Name for the Client "
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echo "(default: \"$(hostname)\")"
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echo "::: -p,--password Password for the Client (no default)"
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echo -n "::: -d,--days Expire the certificate after specified "
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echo "number of days (default: 1080)"
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echo "::: -b,--bitwarden Create and save a client through Bitwarden"
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echo -n "::: -i,--iOS Generate a certificate that leverages iOS "
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echo "keychain"
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echo -n "::: -o,--ovpn Regenerate a .ovpn config file for an "
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echo "existing client"
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echo "::: -h,--help Show this help dialog"
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}
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checkName() {
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# check name
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if [[ "${NAME}" =~ [^a-zA-Z0-9.@_-] ]]; then
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err "Name can only contain alphanumeric characters and these symbols (.-@_)."
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exit 1
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elif [[ "${NAME}" =~ ^[0-9]+$ ]]; then
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err "Names cannot be integers."
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exit 1
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elif [[ "${NAME}" =~ \ |\' ]]; then
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err "Names cannot contain spaces."
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exit 1
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elif [[ "${NAME:0:1}" == "-" ]]; then
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err "Name cannot start with - (dash)"
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exit 1
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elif [[ "${NAME::1}" == "." ]]; then
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err "Names cannot start with a . (dot)."
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exit 1
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elif [[ -z "${NAME}" ]]; then
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err "::: You cannot leave the name blank."
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exit 1
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fi
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}
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keynoPASS() {
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# Build the client key
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export EASYRSA_CERT_EXPIRE="${DAYS}"
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./easyrsa build-client-full "${NAME}" nopass
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cd pki || exit
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}
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useBitwarden() {
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# login and unlock vault
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printf "****Bitwarden Login****"
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printf "\n"
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SESSION_KEY="$(bw login --raw)"
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export BW_SESSION="${SESSION_KEY}"
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printf "Successfully Logged in!"
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printf "\n"
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# ask user for username
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printf "Enter the username: "
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read -r NAME
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#check name
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checkName
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# ask user for length of password
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printf "Please enter the length of characters you want your password to be "
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printf "(minimum 12): "
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read -r LENGTH
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# check length
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until [[ "${LENGTH}" -gt 11 ]] && [[ "${LENGTH}" -lt 129 ]]; do
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echo "Password must be between from 12 to 128 characters, please try again."
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# ask user for length of password
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printf "Please enter the length of characters you want your password to be "
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printf "(minimum 12): "
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read -r LENGTH
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done
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printf "Creating a PiVPN item for your vault..."
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printf "\n"
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# create a new item for your PiVPN Password
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PASSWD="$(bw generate -usln --length "${LENGTH}")"
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bw get template item \
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| jq '.login.type = "1"' \
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| jq '.name = "PiVPN"' \
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| jq -r --arg NAME "${NAME}" '.login.username = $NAME' \
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| jq -r --arg PASSWD "${PASSWD}" '.login.password = $PASSWD' \
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| bw encode \
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| bw create item
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bw logout
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}
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keyPASS() {
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if [[ -z "${PASSWD}" ]]; then
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stty -echo
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while true; do
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printf "Enter the password for the client: "
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read -r PASSWD
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printf "\n"
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printf "Enter the password again to verify: "
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read -r PASSWD2
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printf "\n"
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[[ "${PASSWD}" == "${PASSWD2}" ]] && break
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printf "Passwords do not match! Please try again.\n"
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done
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stty echo
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if [[ -z "${PASSWD}" ]]; then
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err "You left the password blank"
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err "If you don't want a password, please run:"
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err "pivpn add nopass"
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exit 1
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fi
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fi
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if [[ "${#PASSWD}" -lt 4 ]] || [[ "${#PASSWD}" -gt 1024 ]]; then
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err "Password must be between from 4 to 1024 characters"
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exit 1
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fi
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export EASYRSA_CERT_EXPIRE="${DAYS}"
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./easyrsa --passin=pass:"${PASSWD}" \
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--passout=pass:"${PASSWD}" \
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build-client-full "${NAME}"
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cd pki || exit
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}
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cidrToMask() {
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# Source: https://stackoverflow.com/a/20767392
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set -- $((5 - (${1} / 8))) \
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255 255 255 255 \
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$(((255 << (8 - (${1} % 8))) & 255)) \
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0 0 0
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shift "${1}"
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echo "${1-0}.${2-0}.${3-0}.${4-0}"
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}
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### Script
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if [[ ! -f "${setupVars}" ]]; then
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err "::: Missing setup vars file!"
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exit 1
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fi
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if [[ -z "${HELP_SHOWN}" ]]; then
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helpFunc
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echo
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echo "HELP_SHOWN=1" >> "${setupVars}"
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fi
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# Parse input arguments
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while [[ "$#" -gt 0 ]]; do
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_key="${1}"
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case "${_key}" in
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-n | --name | --name=*)
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_val="${_key##--name=}"
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if [[ "${_val}" == "${_key}" ]]; then
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[[ "$#" -lt 2 ]] \
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&& err "Missing value for the optional argument '${_key}'." \
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&& exit 1
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_val="${2}"
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shift
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fi
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NAME="${_val}"
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checkName
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;;
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-p | --password | --password=*)
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_val="${_key##--password=}"
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if [[ "${_val}" == "${_key}" ]]; then
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[[ "$#" -lt 2 ]] \
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&& err "Missing value for the optional argument '${_key}'." \
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&& exit 1
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_val="${2}"
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shift
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fi
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PASSWD="${_val}"
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;;
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-d | --days | --days=*)
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_val="${_key##--days=}"
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if [[ "${_val}" == "${_key}" ]]; then
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[[ "$#" -lt 2 ]] \
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&& err "Missing value for the optional argument '${_key}'." \
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&& exit 1
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_val="${2}"
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shift
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fi
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DAYS="${_val}"
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;;
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-i | --iOS)
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if [[ "${TWO_POINT_FOUR}" -ne 1 ]]; then
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iOS=1
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else
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err "Sorry, can't generate iOS-specific configs for ECDSA certificates"
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err "Generate traditional certificates using 'pivpn -a' or reinstall PiVPN without opting in for OpenVPN 2.4 features"
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exit 1
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fi
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;;
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-h | --help)
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helpFunc
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exit 0
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;;
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nopass)
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NO_PASS="1"
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;;
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-b | --bitwarden)
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if command -v bw > /dev/null; then
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BITWARDEN="2"
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else
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echo 'Bitwarden not found, please install bitwarden'
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if [[ "${PLAT}" == 'Alpine' ]]; then
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echo 'You can download it through the following commands:'
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echo -n $'\t''curl -fLo bitwarden.zip --no-cache https://github.com/'
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echo -n 'bitwarden/clients/releases/download/cli-v2022.6.2/'
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echo 'bw-linux-2022.6.2.zip'
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echo $'\t''apk --no-cache unzip'
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echo $'\t''unzip bitwarden.zip'
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echo $'\t''mv bw /opt/bw'
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echo $'\t''chmod 755 /opt/bw'
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echo $'\t''rm bitwarden.zip'
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echo $'\t''apk --no-cache --purge del -r unzip'
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fi
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exit 1
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fi
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;;
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-o | --ovpn)
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GENOVPNONLY=1
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;;
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*)
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err "Error: Got an unexpected argument '${1}'"
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helpFunc
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exit 1
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;;
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esac
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shift
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done
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#make sure ovpns dir exists
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# Disabling warning for SC2154, var sourced externaly
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# shellcheck disable=SC2154
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if [[ ! -d "${install_home}/ovpns" ]]; then
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mkdir "${install_home}/ovpns"
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chown "${userGroup}" "${install_home}/ovpns"
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chmod 0750 "${install_home}/ovpns"
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fi
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#bitWarden
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if [[ "${BITWARDEN}" =~ "2" ]]; then
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useBitwarden
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fi
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if [[ -z "${NAME}" ]]; then
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printf "Enter a Name for the Client: "
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read -r NAME
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checkName
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else
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checkName
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fi
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if [[ "${GENOVPNONLY}" == 1 ]]; then
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# Generate .ovpn configuration file
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cd /etc/openvpn/easy-rsa/pki || exit
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else
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# Check if name is already in use
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while read -r line || [[ -n "${line}" ]]; do
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STATUS=$(echo "${line}" | awk '{print $1}')
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if [[ "${STATUS}" == "V" ]]; then
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# Disabling SC2001 as ${variable//search/replace}
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# doesn't go well with regexp
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# shellcheck disable=SC2001
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CERT="$(echo "${line}" | sed -e 's:.*/CN=::')"
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if [[ "${CERT}" == "${NAME}" ]]; then
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INUSE="1"
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break
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fi
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fi
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done < "${INDEX}"
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if [[ "${INUSE}" == 1 ]]; then
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err "!! This name is already in use by a Valid Certificate."
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err "Please choose another name or revoke this certificate first."
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exit 1
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# Check if name is reserved
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elif [[ "${NAME}" == "ta" ]] \
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|| [[ "${NAME}" == "server" ]] \
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|| [[ "${NAME}" == "ca" ]]; then
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err "Sorry, this is in use by the server and cannot be used by clients."
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exit 1
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fi
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# As of EasyRSA 3.0.6, by default certificates last 1080 days,
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# see https://github.com/OpenVPN/easy-rsa/blob/6b7b6bf1f0d3c9362b5618ad18c66677351cacd1/easyrsa3/vars.example
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if [[ -z "${DAYS}" ]]; then
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read -r -e -p "How many days should the certificate last? " -i 1080 DAYS
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fi
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if [[ ! "${DAYS}" =~ ^[0-9]+$ ]] \
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|| [[ "${DAYS}" -lt 1 ]] \
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|| [[ "${DAYS}" -gt 3650 ]]; then
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# The CRL lasts 3650 days so it doesn't make much sense
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# that certificates would last longer
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err "Please input a valid number of days, between 1 and 3650 inclusive."
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exit 1
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fi
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cd /etc/openvpn/easy-rsa || exit
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if [[ "${NO_PASS}" =~ "1" ]]; then
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if [[ -n "${PASSWD}" ]]; then
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err "Both nopass and password arguments passed to the script. Please use either one."
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exit 1
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else
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keynoPASS
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fi
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else
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keyPASS
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fi
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fi
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#1st Verify that clients Public Key Exists
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if [[ ! -f "issued/${NAME}${CRT}" ]]; then
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err "[ERROR]: Client Public Key Certificate not found: ${NAME}${CRT}"
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exit
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fi
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echo "Client's cert found: ${NAME}${CRT}"
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#Then, verify that there is a private key for that client
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if [[ ! -f "private/${NAME}${KEY}" ]]; then
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err "[ERROR]: Client Private Key not found: ${NAME}${KEY}"
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exit
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fi
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echo "Client's Private Key found: ${NAME}${KEY}"
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#Confirm the CA public key exists
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if [[ ! -f "${CA}" ]]; then
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err "[ERROR]: CA Public Key not found: ${CA}"
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exit
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fi
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echo "CA public Key found: ${CA}"
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#Confirm the tls key file exists
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if [[ ! -f "${TA}" ]]; then
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err "[ERROR]: tls Private Key not found: ${TA}"
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exit
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fi
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echo "tls Private Key found: ${TA}"
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## Added new step to create an .ovpn12 file that can be stored on iOS keychain
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## This step is more secure method and does not require the end-user to keep
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## entering passwords, or storing the client private cert where it can be easily
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## tampered
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## https://openvpn.net/faq/how-do-i-use-a-client-certificate-and-private-key-from-the-ios-keychain/
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# Generates the .ovpn file WITHOUT the client private key
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{
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# Start by populating with the default file
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cat "${DEFAULT}"
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# Now, append the CA Public Cert
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echo "<ca>"
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cat "${CA}"
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echo "</ca>"
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# Next append the client Public Cert
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echo "<cert>"
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sed -n \
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-e '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' \
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< "issued/${NAME}${CRT}"
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echo "</cert>"
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if [[ "${iOS}" != 1 ]]; then
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# Then, append the client Private Key
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echo "<key>"
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cat "private/${NAME}${KEY}"
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echo "</key>"
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fi
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# Finally, append the tls Private Key
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if [[ "${iOS}" != 1 ]] && [[ "${TWO_POINT_FOUR}" -eq 1 ]]; then
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echo "<tls-crypt>"
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cat "${TA}"
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echo "</tls-crypt>"
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else
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echo "<tls-auth>"
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cat "${TA}"
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echo "</tls-auth>"
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fi
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} > "${NAME}${FILEEXT}"
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if [[ "${iOS}" == 1 ]]; then
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# Copy the .ovpn profile to the home directory for convenient remote access
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printf "========================================================\n"
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printf "Generating an .ovpn12 file for use with iOS devices\n"
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printf "Please remember the export password\n"
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printf "as you will need this import the certificate on your iOS device\n"
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printf "========================================================\n"
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openssl pkcs12 \
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-passin pass:"${PASSWD_UNESCAPED}" \
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-export \
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-in "issued/${NAME}${CRT}" \
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-inkey "private/${NAME}${KEY}" \
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-certfile "${CA}" \
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-name "${NAME}" \
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-out "${install_home}/ovpns/${NAME}.ovpn12"
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chown "${userGroup}" "${install_home}/ovpns/${NAME}.ovpn12"
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chmod 640 "${install_home}/ovpns/${NAME}.ovpn12"
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printf "========================================================\n"
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printf "\e[1mDone! %s successfully created!\e[0m \n" "${NAME}.ovpn12"
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printf "You will need to transfer both the .ovpn and .ovpn12 files\n"
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printf "to your iOS device.\n"
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printf "========================================================\n\n"
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fi
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#disabling SC2514, variable sourced externaly
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# shellcheck disable=SC2154
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NET_REDUCED="${pivpnNET::-2}"
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# Find an unused number for the last octet of the client IP
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for i in {2..254}; do
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# find returns 0 if the folder is empty, so we create the 'ls -A [...]'
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# exception to stop at the first static IP (10.8.0.2). Otherwise it would
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# cycle to the end without finding and available octet.
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# disabling SC2514, variable sourced externaly
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# shellcheck disable=SC2154
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if [[ -z "$(ls -A /etc/openvpn/ccd)" ]] \
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|| ! find /etc/openvpn/ccd -type f \
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-exec grep -q "${NET_REDUCED}.${i}" {} +; then
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COUNT="${i}"
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echo -n "ifconfig-push ${NET_REDUCED}.${i} " >> /etc/openvpn/ccd/"${NAME}"
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# The space after ${i} is important ------^!
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cidrToMask "${subnetClass}" >> /etc/openvpn/ccd/"${NAME}"
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# the end resuld should be a line like:
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# ifconfig-push ${NET_REDUCED}.${i} ${subnetClass}
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# ifconfig-push 10.205.45.8 255.255.255.0
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break
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fi
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done
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if [[ -f /etc/pivpn/hosts.openvpn ]]; then
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echo "${NET_REDUCED}.${COUNT} ${NAME}.pivpn" >> /etc/pivpn/hosts.openvpn
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if killall -SIGHUP pihole-FTL; then
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echo "::: Updated hosts file for Pi-hole"
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else
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err "::: Failed to reload pihole-FTL configuration"
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fi
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fi
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# Copy the .ovpn profile to the home directory for convenient remote access
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dest_path="${install_home}/ovpns/${NAME}${FILEEXT}"
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cp "/etc/openvpn/easy-rsa/pki/${NAME}${FILEEXT}" "${dest_path}"
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chown "${install_user}:${install_user}" "${dest_path}"
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chmod 640 "/etc/openvpn/easy-rsa/pki/${NAME}${FILEEXT}"
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chmod 640 "${dest_path}"
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unset dest_path
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printf "\n\n"
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printf "========================================================\n"
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printf "\e[1mDone! %s successfully created!\e[0m \n" "${NAME}${FILEEXT}"
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printf "%s was copied to:\n" "${NAME}${FILEEXT}"
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printf " %s/ovpns\n" "${install_home}"
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printf "for easy transfer. Please use this profile only on one\n"
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printf "device and create additional profiles for other devices.\n"
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printf "========================================================\n\n"
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