package/network/services/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         *:*)
  89           proto_add_ipv6_route "${allowed_ip%%/*}" "128"
  90         ;;
  91         *.*)
  92           proto_add_ipv4_route "${allowed_ip%%/*}" "32"
  93         ;;
  94       esac
  95     done
  96   fi
  97 }
  98
  99
 100 proto_wireguard_setup() {
 101   local config="$1"
 102   local wg_dir="/tmp/wireguard"
 103   local wg_cfg="${wg_dir}/${config}"
 104
 105   local private_key
 106   local listen_port
 107   local mtu
 108
 109   # load configuration
 110   config_load network
 111   config_get private_key   "${config}" "private_key"
 112   config_get listen_port   "${config}" "listen_port"
 113   config_get addresses     "${config}" "addresses"
 114   config_get mtu           "${config}" "mtu"
 115   config_get fwmark        "${config}" "fwmark"
 116
 117   # create interface
 118   ip link del dev "${config}" 2>/dev/null
 119   ip link add dev "${config}" type wireguard
 120
 121   if [ "${mtu}" ]; then
 122     ip link set mtu "${mtu}" dev "${config}"
 123   fi
 124
 125   proto_init_update "${config}" 1
 126
 127   # generate configuration file
 128   umask 077
 129   mkdir -p "${wg_dir}"
 130   echo "[Interface]"                     >  "${wg_cfg}"
 131   echo "PrivateKey=${private_key}"       >> "${wg_cfg}"
 132   if [ "${listen_port}" ]; then
 133     echo "ListenPort=${listen_port}"     >> "${wg_cfg}"
 134   fi
 135   if [ "${fwmark}" ]; then
 136     echo "FwMark=${fwmark}" >> "${wg_cfg}"
 137   fi
 138   config_foreach proto_wireguard_setup_peer "wireguard_${config}"
 139
 140   # apply configuration file
 141   ${WG} setconf ${config} "${wg_cfg}"
 142   WG_RETURN=$?
 143
 144   # delete configuration file
 145   rm -f "${wg_cfg}"
 146
 147   # check status
 148   if [ ${WG_RETURN} -ne 0 ]; then
 149     sleep 5
 150     proto_setup_failed "${config}"
 151     exit 1
 152   fi
 153
 154   # add ip addresses
 155   for address in ${addresses}; do
 156     case "${address}" in
 157       *:*/*)
 158         proto_add_ipv6_address "${address%%/*}" "${address##*/}"
 159       ;;
 160       *.*/*)
 161         proto_add_ipv4_address "${address%%/*}" "${address##*/}"
 162       ;;
 163       *:*)
 164         proto_add_ipv6_address "${address%%/*}" "128"
 165       ;;
 166       *.*)
 167         proto_add_ipv4_address "${address%%/*}" "32"
 168       ;;
 169     esac
 170   done
 171
 172   # endpoint dependency
 173   wg show "${config}" endpoints | \
 174     sed -E 's/\[?([0-9.:a-f]+)\]?:([0-9]+)/\1 \2/' | \
 175     while IFS=$'\t ' read -r key address port; do
 176     [ -n "${port}" ] || continue
 177     proto_add_host_dependency "${config}" "${address}"
 178   done
 179
 180   proto_send_update "${config}"
 181 }
 182
 183
 184 proto_wireguard_teardown() {
 185   local config="$1"
 186   ip link del dev "${config}" >/dev/null 2>&1
 187 }
 188
 189
 190 [ -n "$INCLUDE_ONLY" ] || {
 191   add_protocol wireguard
 192 }