net/wireguard/files/wireguard.sh

   1 #!/bin/sh
   2 # Copyright 2016-2017 Dan Luedtke <mail@danrl.com>
   3 # Licensed to the public under the Apache License 2.0.
   4
   5
   6 WG=/usr/bin/wg
   7 if [ ! -x $WG ]; then
   8   logger -t "wireguard" "error: missing wireguard-tools (${WG})"
   9   exit 0
  10 fi
  11
  12
  13 [ -n "$INCLUDE_ONLY" ] || {
  14   . /lib/functions.sh
  15   . ../netifd-proto.sh
  16   init_proto "$@"
  17 }
  18
  19
  20 proto_wireguard_init_config() {
  21   proto_config_add_string "private_key"
  22   proto_config_add_int    "listen_port"
  23   proto_config_add_int    "mtu"
  24   proto_config_add_string "fwmark"
  25   available=1
  26   no_proto_task=1
  27 }
  28
  29
  30 proto_wireguard_setup_peer() {
  31   local peer_config="$1"
  32
  33   local public_key
  34   local preshared_key
  35   local allowed_ips
  36   local route_allowed_ips
  37   local endpoint_host
  38   local endpoint_port
  39   local persistent_keepalive
  40
  41   config_get      public_key           "${peer_config}" "public_key"
  42   config_get      preshared_key        "${peer_config}" "preshared_key"
  43   config_get      allowed_ips          "${peer_config}" "allowed_ips"
  44   config_get_bool route_allowed_ips    "${peer_config}" "route_allowed_ips" 0
  45   config_get      endpoint_host        "${peer_config}" "endpoint_host"
  46   config_get      endpoint_port        "${peer_config}" "endpoint_port"
  47   config_get      persistent_keepalive "${peer_config}" "persistent_keepalive"
  48
  49   # peer configuration
  50   echo "[Peer]"                                         >> "${wg_cfg}"
  51   echo "PublicKey=${public_key}"                        >> "${wg_cfg}"
  52   if [ "${preshared_key}" ]; then
  53     echo "PresharedKey=${preshared_key}"                >> "${wg_cfg}"
  54   fi
  55   for allowed_ip in $allowed_ips; do
  56     echo "AllowedIPs=${allowed_ip}"                     >> "${wg_cfg}"
  57   done
  58   if [ "${endpoint_host}" ]; then
  59     case "${endpoint_host}" in
  60       *:*)
  61         endpoint="[${endpoint_host}]"
  62       ;;
  63       *)
  64         endpoint="${endpoint_host}"
  65       ;;
  66     esac
  67     if [ "${endpoint_port}" ]; then
  68       endpoint="${endpoint}:${endpoint_port}"
  69     else
  70       endpoint="${endpoint}:51820"
  71     fi
  72     echo "Endpoint=${endpoint}"                         >> "${wg_cfg}"
  73   fi
  74   if [ "${persistent_keepalive}" ]; then
  75     echo "PersistentKeepalive=${persistent_keepalive}"  >> "${wg_cfg}"
  76   fi
  77
  78   # add routes for allowed ips
  79   if [ ${route_allowed_ips} -ne 0 ]; then
  80     for allowed_ip in ${allowed_ips}; do
  81       case "${allowed_ip}" in
  82         *:*/*)
  83           proto_add_ipv6_route "${allowed_ip%%/*}" "${allowed_ip##*/}"
  84         ;;
  85         */*)
  86           proto_add_ipv4_route "${allowed_ip%%/*}" "${allowed_ip##*/}"
  87         ;;
  88       esac
  89     done
  90   fi
  91 }
  92
  93
  94 proto_wireguard_setup() {
  95   local config="$1"
  96   local wg_dir="/tmp/wireguard"
  97   local wg_cfg="${wg_dir}/${config}"
  98
  99   local private_key
 100   local listen_port
 101   local mtu
 102
 103   # load configuration
 104   config_load network
 105   config_get private_key   "${config}" "private_key"
 106   config_get listen_port   "${config}" "listen_port"
 107   config_get addresses     "${config}" "addresses"
 108   config_get mtu           "${config}" "mtu"
 109   config_get fwmark        "${config}" "fwmark"
 110
 111   # create interface
 112   ip link del dev "${config}" 2>/dev/null
 113   ip link add dev "${config}" type wireguard
 114
 115   if [ "${mtu}" ]; then
 116     ip link set mtu "${mtu}" dev "${config}"
 117   fi
 118
 119   proto_init_update "${config}" 1
 120
 121   # generate configuration file
 122   umask 077
 123   mkdir -p "${wg_dir}"
 124   echo "[Interface]"                     >  "${wg_cfg}"
 125   echo "PrivateKey=${private_key}"       >> "${wg_cfg}"
 126   if [ "${listen_port}" ]; then
 127     echo "ListenPort=${listen_port}"     >> "${wg_cfg}"
 128   fi
 129   if [ "${fwmark}" ]; then
 130     echo "FwMark=${fwmark}" >> "${wg_cfg}"
 131   fi
 132   config_foreach proto_wireguard_setup_peer "wireguard_${config}"
 133
 134   # apply configuration file
 135   ${WG} setconf ${config} "${wg_cfg}"
 136   WG_RETURN=$?
 137
 138   # delete configuration file
 139   rm -f "${wg_cfg}"
 140
 141   # check status
 142   if [ ${WG_RETURN} -ne 0 ]; then
 143     sleep 5
 144     proto_setup_failed "${config}"
 145     exit 1
 146   fi
 147
 148   # add ip addresses
 149   for address in ${addresses}; do
 150     case "${address}" in
 151       *:*/*)
 152         proto_add_ipv6_address "${address%%/*}" "${address##*/}"
 153       ;;
 154       *.*/*)
 155         proto_add_ipv4_address "${address%%/*}" "${address##*/}"
 156       ;;
 157       *:*)
 158         proto_add_ipv6_address "${address%%/*}" "128"
 159       ;;
 160       *.*)
 161         proto_add_ipv4_address "${address%%/*}" "32"
 162       ;;
 163     esac
 164   done
 165
 166   # endpoint dependency
 167   wg show "${config}" endpoints | \
 168     sed -E 's/\[?([0-9.:a-f]+)\]?:([0-9]+)/\1 \2/' | \
 169     while IFS=$'\t ' read -r key address port; do
 170     [ -n "${port}" ] || continue
 171     proto_add_host_dependency "${config}" "${address}"
 172   done
 173
 174   proto_send_update "${config}"
 175 }
 176
 177
 178 proto_wireguard_teardown() {
 179   local config="$1"
 180   ip link del dev "${config}" >/dev/null 2>&1
 181 }
 182
 183
 184 [ -n "$INCLUDE_ONLY" ] || {
 185   add_protocol wireguard
 186 }