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#!/bin/bash
set -e
WG_SERVER_HOME="{{ wireguard_server_home }}"
WG_PEERS_HOME="${WG_SERVER_HOME}/peers.d"
IP_FILE="${WG_SERVER_HOME}/ips.txt"
SUBNET_PREFIX="{{ wireguard_subnet_prefix }}"
DEFAULT_PORT="{{ wireguard_port }}"
DEFAULT_DNS="8.8.8.8"
test "${EUID}" -ne 0 && printf "%s\n" "run as root" && exit 1
umask 077
if ! command -v wg &>/dev/null; then
printf "%s\n" "[err] wireguard not installed"
exit 1
fi
function usage() {
printf "%s\n" \
"" \
"wireguard peer management script" \
"usage: $(basename ${0}) <action> [-h] <options>" \
"" \
"add-peer add a peer to the wg network" \
"options:" \
"-s <server> required: wg server endpoint" \
"-n <name> optional: peer name, default random" \
"-p <port> optional: wg server port, default ${DEFAULT_PORT}" \
"-d <dns> optional: dns server, default ${DEFAULT_DNS}" \
"" \
"remove-peer remove peer from the wg network" \
"options:" \
"-n <name> required: peer name" \
"" \
"usage print this help message and exit" \
"" \
"configuration files:" \
"wg server config dir: ${WG_SERVER_HOME}" \
"wg peers configs dir: ${WG_PEERS_HOME}"
exit 1
}
function validate_ip() {
local ip="${1}"
if ! [[ "${ip}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
printf "%s\n" "[err] invalid IP address: ${ip}"
exit 1
fi
}
function validate_port() {
local port="${1}"
if ! [[ "${port}" =~ ^[0-9]+$ ]] || [[ "${port}" -lt 1 ]] || [[ "${port}" -gt 65535 ]]; then
printf "%s\n" "[err] invalid port: ${port}"
exit 1
fi
}
function get_next_available_ip() {
(
flock -x 200
touch "${IP_FILE}"
for i in {2..254}; do
ip="${SUBNET_PREFIX}.${i}"
if ! grep -q "${ip}" "${IP_FILE}"; then
printf "%s\n" "${ip}"
printf "%s\n" "${ip}" >> "${IP_FILE}"
exit 0
fi
done
printf "%s\n" "[err] no available ips in range ${SUBNET_PREFIX}.2 - ${SUBNET_PREFIX}.254"
exit 1
) 200>"${IP_FILE}.lock"
}
function add_peer() {
if ! test -d "${WG_SERVER_HOME}" || ! test -f "${WG_SERVER_HOME}/wg0.conf"; then
printf "%s\n" "[err] no wg server config found; install the server first"
exit 1
fi
if ! test "${server}"; then
printf "%s\n" "[err] missing -s <server>"
exit 1
fi
mkdir -p "${WG_PEERS_HOME}/${name}" &>/dev/null
assigned_ip=$(get_next_available_ip)
(
cd "${WG_PEERS_HOME}/${name}"
wg genkey | tee "${name}.key" | wg pubkey > "${name}.pub"
cat > "${name}.conf" << EOF
# peer ${name}
[Interface]
PrivateKey = $(cat "${name}.key")
Address = ${assigned_ip}/24
DNS = ${dns}
[Peer]
PublicKey = $(wg pubkey < "${WG_SERVER_HOME}/server.key")
PresharedKey = $(cat "${WG_SERVER_HOME}/psk.key")
Endpoint = ${server}:${port}
AllowedIPs = 0.0.0.0/0
PersistentKeepalive = 25
EOF
printf "%s\n" \
"[inf] generated peer configuration ${name} to server ${server}" \
"[inf] config: ${WG_PEERS_HOME}/${name}/${name}.conf"
)
(
peer_public_key=$(wg pubkey < "${WG_PEERS_HOME}/${name}/${name}.key")
cat >> "${WG_SERVER_HOME}/wg0.conf" << EOF
# peer ${name}
[Peer]
PublicKey = ${peer_public_key}
PresharedKey = $(cat "${WG_SERVER_HOME}/psk.key")
AllowedIPs = ${assigned_ip}/32
# peer ${name}
EOF
systemctl restart wg-quick@wg0.service
printf "%s\n" "[inf] restarted wg-quick@wg0.service"
)
}
function remove_peer() {
if ! test "${name}"; then
printf "%s\n" "[err] missing -n <name>"
exit 1
fi
if grep -qi "^# peer ${name}" "${WG_SERVER_HOME}/wg0.conf"; then
sed -i "/# peer ${name}/,/# peer ${name}/ s/^/# /" "${WG_SERVER_HOME}/wg0.conf"
systemctl restart wg-quick@wg0.service
printf "%s\n" "[inf] removed peer ${name} and restarted wg server"
else
printf "%s\n" "[err] no such peer ${name} in ${WG_SERVER_HOME}/wg0.conf"
exit 1
fi
}
port="${DEFAULT_PORT}"
dns="${DEFAULT_DNS}"
if test "${1}"; then
action="${1}"
shift
case "${action}" in
add-peer)
while getopts "s:n:p:d:h" opts; do
case "${opts}" in
s) server="${OPTARG}"; validate_ip "${server}";;
n) name="${OPTARG}";;
p) port="${OPTARG}"; validate_port "${port}";;
d) dns="${OPTARG}"; validate_ip "${dns}";;
h) usage;;
*) usage;;
esac
done
rand=$(printf "%s\n" "${RANDOM}" | md5sum | fold -w4 | head -1)
name="${name:-${rand}}"
add_peer
;;
remove-peer)
while getopts "n:h" opts; do
case "${opts}" in
n) name="${OPTARG}";;
h) usage;;
*) usage;;
esac
done
remove_peer
;;
usage)
usage
;;
*)
usage
;;
esac
else
usage
fi
|