X-Git-Url: https://iankelling.org/git/?p=vpn-setup;a=blobdiff_plain;f=vpn-server-setup;h=a311ba8d0ae09bbc3f543921af3b06a07451fbbd;hp=bbfd41b8687c9ab31f9c1176b07f32610b7823f7;hb=e4c2b65e04673dc12575e4c1a182fe86e3dc219a;hpb=db7cd23a75387ecb417b4b621d6610bc6ff4eb6d

diff --git a/vpn-server-setup b/vpn-server-setup
index bbfd41b..a311ba8 100755
--- a/vpn-server-setup
+++ b/vpn-server-setup
@@ -20,8 +20,8 @@ trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 [[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
 
 usage() {
-    cat <<'EOF'
-usage: ${0##*/} [-d|-h|--help]
+  cat <<'EOF'
+usage: ${0##*/} [-d|-h|--help] [IPV6_ADDR/BITS IPV6_DEFAULT_ROUTE]
 
 -r  Do not push default route
 -d  Do not push dns
@@ -32,12 +32,18 @@ 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
 the script will not generate them if it sees they exist already.
 
+For future updates to this script, this is a good place to
+take inspiration.
+https://github.com/angristan/openvpn-install/blob/master/openvpn-install.sh
+
 Note: Uses GNU getopt options parsing style
 EOF
-    exit $1
+  exit $1
 }
 
 dns=true
@@ -46,47 +52,77 @@ start=true
 temp=$(getopt -l help drsh "$@") || usage 1
 eval set -- "$temp"
 while true; do
-    case $1 in
-        -d) dns=false; shift ;;
-        -r) route=false; shift ;;
-        -s) start=false; shift ;;
-        -h|--help) usage ;;
-        --) shift; break ;;
-        *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
-    esac
+  case $1 in
+    -d) dns=false; shift ;;
+    -r) route=false; shift ;;
+    -s) start=false; shift ;;
+    -h|--help) usage ;;
+    --) shift; break ;;
+    *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
+  esac
 done
 
+read -r ip6 ip6route <<<"$@"
+
+
 apt-get update
-# suggests get's us openssl
+# suggests get's us openssl. policy-rc.d is to prevent install from starting services
+f=/usr/sbin/policy-rc.d;
+dd of=$f <<EOF
+#!/bin/sh
+exit 101
+EOF
+chmod +x $f;
 apt-get install --install-suggests -y openvpn
+rm $f
+
 if [[ -e /lib/systemd/system/openvpn-server@.service ]]; then
-    vpn_service=openvpn-server@server
+  vpn_service=openvpn-server@server
 else
-    vpn_service=openvpn@server
+  vpn_service=openvpn@server
 fi
 apt-get install -y uuid-runtime easy-rsa
 mkdir -p /etc/openvpn/easy-rsa
 cd /etc/openvpn/easy-rsa
 cp -r /usr/share/easy-rsa/* .
 if [[ -e openssl-1.0.0.cnf && ! -e openssl.cnf ]]; then
-    # there's a debian bug about this.
-    ln -s openssl-1.0.0.cnf openssl.cnf
+  # there's a debian bug about this.
+  ln -s openssl-1.0.0.cnf openssl.cnf
+fi
+
+server_dir=/etc/openvpn/server
+mkdir -p $server_dir
+chmod 700 $server_dir
+
+
+new=true
+keyfiles=(/etc/openvpn/easy-rsa/pki/{ca.crt,private/server.key,issued/server.crt})
+if [[ -e /etc/openvpn/easy-rsa/build-ca ]]; then
+  new=false
+  keyfiles=(/etc/openvpn/easy-rsa/keys/{ca.crt,server.{crt,key}})
 fi
 
 keys_exist=true
-keyfiles=(/etc/openvpn/easy-rsa/keys/{ca.crt,server.{crt,key},dh2048.pem,ta.key})
 for f in ${keyfiles[@]}; do
-    if [[ ! -e $f ]]; then
-        keys_exist=false
-        break
-    fi
+  if [[ ! -e $f ]]; then
+    keys_exist=false
+    break
+  fi
 done
 
 if ! $keys_exist; then
-    source vars # dun care about setting cert cn etc from the non-example values
+  # newer sample configs (post stretch) use ta.key. no harm making it for earlier oses
+  openvpn --genkey --secret $server_dir/ta.key
+  if $new; then
+    ./easyrsa init-pki
+    ./easyrsa --batch build-ca nopass
+    ./easyrsa build-server-full server nopass
+    openssl dhparam -out $server_dir/dh2048.pem 2048
+  else
+    # dun care about settning cert cn etc from the non-example values
+    source vars
+    # doesnt exist in buster
     ./clean-all # note: removes and creates /etc/openvpn/easy-rsa/keys
-    # newer sample configs (post stretch) use ta.key. no harm making it for earlier oses
-    openvpn --genkey --secret /etc/openvpn/easy-rsa/keys/ta.key
     # accept default prompts
     echo -e '\n\n\n\n\n\n\n\n' | ./build-ca
 
@@ -97,11 +133,9 @@ if ! $keys_exist; then
     # Note, this is not idempotent.
     { echo -e '\n\n\n\n\n\n\n\n\n\n'; sleep 1; echo -e 'y\ny\n'; } | ./build-key-server server
     ./build-dh
+  fi
 fi
 
-server_dir=/etc/openvpn/server
-mkdir -p $server_dir
-chmod 700 $server_dir
 
 cp /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz $server_dir
 gzip -df $server_dir/server.conf.gz
@@ -110,7 +144,7 @@ gzip -df $server_dir/server.conf.gz
 cp ${keyfiles[@]} $server_dir
 # for legacy systems
 for f in ${keyfiles[@]}; do
-    ln -sf server/${f##*/} /etc/openvpn
+  ln -sf server/${f##*/} /etc/openvpn
 done
 
 cat >>$server_dir/server.conf <<'EOF'
@@ -153,27 +187,43 @@ mkdir -p /etc/openvpn/client-config
 
 
 if $dns; then
-    # Be the dns server for clients
-    cat >>$server_dir/server.conf <<'EOF'
+  # Be the dns server for clients
+  cat >>$server_dir/server.conf <<'EOF'
 push "dhcp-option DNS 10.8.0.1"
 EOF
 fi
 
+if $ip6; then
+  cat >>$server_dir/server.conf <<EOF
+push tun-ipv6 # legacy option that flidas needs, has no harm.
+ifconfig-ipv6 $ip6 $ip6_route
+EOF
+fi
+
+
 if $route; then
-    cat >>$server_dir/server.conf <<'EOF'
+  cat >>$server_dir/server.conf <<'EOF'
 # Be the default gateway for clients.
 push "redirect-gateway def1"
 EOF
-    echo "1" > /proc/sys/net/ipv4/ip_forward
-    sed -i --follow-symlinks '/^ *net\.ipv4\.ip_forward=.*/d' /etc/sysctl.conf
-    cat >>/etc/sysctl.conf <<'EOF'
-net.ipv4.ip_forward=1
+  if $ip6; then
+    cat >>$server_dir/server.conf <<'EOF'
+push "route-ipv6 2000::/3"
 EOF
+  fi
+fi
 
+sed -i --follow-symlinks '/^ *net\.ipv4\.ip_forward=.*/d' /etc/sysctl.conf
+sed -i --follow-symlinks '/^ *net.ipv6.conf.all.forwarding=.*/d' /etc/sysctl.conf
+cat >>/etc/sysctl.conf <<'EOF'
+net.ipv4.ip_forward=1
+net.ipv6.conf.all.forwarding=1
+EOF
+sysctl -p /etc/sysctl.conf
 
-    gw=$(ip route | sed -rn 's/^default via .* dev (\S+).*/\1/p')
+gw=$(ip route | sed -rn 's/^default via .* dev (\S+).*/\1/p')
 
-    cat >/etc/systemd/system/vpnnat.service <<EOF
+cat >/etc/systemd/system/vpnnat.service <<EOF
 [Unit]
 Description=Turns on nat iptables setting
 
@@ -184,13 +234,13 @@ ExecStart=/sbin/iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o $gw -j MASQUERA
 ExecStop=/sbin/iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -o $gw -j MASQUERADE
 
 [Install]
-WantedBy=$vpn_service
+WantedBy=$vpn_service.service
 EOF
-    systemctl daemon-reload # needed if the file was already there
-    # note, no need to start it, the vpn_service does that.
-fi
+systemctl daemon-reload # needed if the file was already there
+# note, no need to start it, the vpn_service does that.
+systemctl enable vpnnat
 
 if $start; then
-    systemctl enable $vpn_service
-    systemctl restart $vpn_service
+  systemctl enable $vpn_service
+  systemctl restart $vpn_service
 fi