#!/bin/bash
-# Copyright (C) 2016 Ian Kelling
+# I, Ian Kelling, follow the GNU license recommendations at
+# https://www.gnu.org/licenses/license-recommendations.en.html. They
+# recommend that small programs, < 300 lines, be licensed under the
+# Apache License 2.0. This file contains or is part of one or more small
+# programs. If a small program grows beyond 300 lines, I plan to switch
+# its license to GPL.
+
+# Copyright 2024 Ian Kelling
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
usage() {
cat <<'EOF'
-usage: ${0##*/} [OPTIONS] [IPV6_ADDR/BITS IPV6_DEFAULT_ROUTE]
-
--4 I prefix of range for ipv4, default 10.8.0
--d Do not push dns
--n Name. default = server. 2 servers on the same host need different names.
--p Port. default 1194
--r Do not push default route
--s Do not start openvpn
+usage: ${0##*/} [OPTIONS] [IPV6_ADDR/BITS]
+
+-4 Prefix of range for ipv4, default 10.8.0
+-6 IP6_NETWORK Do ip6 nat for this network. ipv6 will work without nat,
+ but you may want it in certain circumstances.
+-d Do not push dns
+-i INTERFACE_NAME name of tun interface
+-n NAME default = server. 2 servers on the same host need different names.
+-p PORT default 1194
+-r Do not push default route
+-s Do not start openvpn
-h --help print help
+IPV6_ADDR/BITS Ipv6 address of the vpn interface.
+
Sets up a vpn server which pushes gateway route and dns server so all
traffic goes through the vpn. requires systemd, and might have some
debian specific paths.
For ipv6, we assume ipv6_addr routes to the server.
-You can save all the keys by storing /etc/openvpn/easy-rsa/keys, and
+You can save all the keys by storing /etc/openvpn/easy-rsa-NAME/keys, and
the script will not generate them if it sees they exist already.
For future updates to this script, this is a good place to
start=true
ip4=10.8.0
name=server
-temp=$(getopt -l help 4:dn:p:rsh "$@") || usage 1
+temp=$(getopt -l help 4:6:di:n:p:rsh "$@") || usage 1
eval set -- "$temp"
while true; do
case $1 in
-4) ip4=$2; shift 2 ;;
+ -6) ip6net=$2; shift 2 ;;
-d) dns=false; shift ;;
+ -i) ifname=$2; shift 2 ;;
-n) name=$2; shift 2 ;;
-p) port=$2; shift 2 ;;
-r) route=false; shift ;;
source /a/bin/distro-functions/src/package-manager-abstractions
-pi-nostart openvpn openssl resolvconf easy-rsa uuid-runtime
+pi-nostart openvpn openssl easy-rsa uuid-runtime
if [[ -e /lib/systemd/system/openvpn-server@.service ]]; then
vpn_service=openvpn-server@$name
echo 'set_var EASYRSA_NS_SUPPORT "yes"' >vars
./easyrsa init-pki
./easyrsa --batch build-ca nopass
- ./easyrsa build-server-full $name nopass
+ ./easyrsa --days=3650 build-server-full $name nopass
else
# dun care about settning cert cn etc from the non-example values
source vars
fi
fi
-
-gzip -dc /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz >$conf
+if [[ -e /usr/share/doc/openvpn/examples/sample-config-files/server.conf ]]; then
+ cat /usr/share/doc/openvpn/examples/sample-config-files/server.conf >$conf
+else
+ # pre-bullsye name
+ gzip -dc /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz >$conf
+fi
cafile=$server_dir/ca-$name.crt
cp $ca_origin $cafile
EOF
fi
+if [[ $ifname ]]; then
+ cat >>$conf <<EOF
+dev $ifname
+EOF
+fi
+
if [[ $ip6 ]]; then
cat >>$conf <<EOF
push tun-ipv6 # legacy option that flidas needs, has no harm.
-ifconfig-ipv6 $ip6 $ip6route
+# the ::1 is not used, i just put a short valid address there
+ifconfig-ipv6 $ip6 ::1
EOF
sed -i --follow-symlinks '/^ *net.ipv6.conf.all.forwarding=.*/d' /etc/sysctl.conf
gw=$(ip route | sed -rn 's/^default via .* dev (\S+).*/\1/p' | head -n1)
-cat >/etc/systemd/system/vpnnat.service <<EOF
-[Unit]
-Description=Turns on nat iptables setting
-
+d=/etc/systemd/system/$vpn_service.service.d
+mkdir -p $d
+f=$d/nat.conf
+cat >$f <<EOF
[Service]
-Type=oneshot
-RemainAfterExit=yes
-ExecStart=/sbin/iptables -t nat -A POSTROUTING -s $ip4.0/24 -o $gw -j MASQUERADE
-ExecStop=/sbin/iptables -t nat -D POSTROUTING -s $ip4.0/24 -o $gw -j MASQUERADE
-
-[Install]
-WantedBy=$vpn_service.service
+ExecStartPre=/sbin/iptables -t nat -A POSTROUTING -s $ip4.0/24 -o $gw -j MASQUERADE
+ExecStopPost=/sbin/iptables -t nat -D POSTROUTING -s $ip4.0/24 -o $gw -j MASQUERADE
+EOF
+if [[ $ip6net ]]; then
+ cat >>$f <<EOF
+ExecStartPre=/sbin/ip6tables -t nat -A POSTROUTING -s $ip6net -o $gw -j MASQUERADE
+ExecStopPost=/sbin/ip6tables -t nat -D POSTROUTING -s $ip6net -o $gw -j MASQUERADE
EOF
-systemctl daemon-reload # needed if the file was already there
-# note, no need to start it, the vpn_service does that.
-systemctl enable vpnnat
+ systemctl daemon-reload # needed if the file was already there
-if $start; then
- systemctl enable $vpn_service
- systemctl restart $vpn_service
+ if $start; then
+ systemctl enable $vpn_service
+ systemctl restart $vpn_service
+ fi
fi
iankelling.org / git / vpn-setup / blobdiff