21 03 2010

LAN access through OpenWRT OpenVPN server

UCI way.
openvpn_logo
Router address is 192.168.1.1 (default gateway for every PC in the network). The task is providing access for VPN client to the 192.168.1.0 LAN.

opkg update
opkg install openvpn-openssl openvpn-easy-rsa
build-ca
build-dh
build-key-server my-server
build-key sapsd_client1
cp /etc/easy-rsa/keys/ca.crt /etc/easy-rsa/keys/my-server.* /etc/easy-rsa/keys/dh2048.pem /etc/openvpn

opkg update

opkg install openvpn-openssl openvpn-easy-rsa

build-ca

build-dh

build-key-server my-server

build-key sapsd_client1

cp /etc/easy-rsa/keys/ca.crt /etc/easy-rsa/keys/my-server.* /etc/easy-rsa/keys/dh2048.pem /etc/openvpn

Now, copy next files from openwrt router to the client (e.g. using WinSCP):
/etc/easy-rsa/keys/ca.crt
/etc/easy-rsa/keys/sapsd_client1.*
Next part are copy of wiki.openwrt.org chapter:
**
Create the VPN interface (named vpn0):

uci set network.vpn0=interface
uci set network.vpn0.ifname=tun0
uci set network.vpn0.proto=none
uci set network.vpn0.auto=1

uci set network.vpn0=interface

uci set network.vpn0.ifname=tun0

uci set network.vpn0.proto=none

uci set network.vpn0.auto=1

Allow incoming client connections by opening the server port (default 1194) in our firewall:

uci set firewall.Allow_OpenVPN_Inbound=rule
uci set firewall.Allow_OpenVPN_Inbound.target=ACCEPT
uci set firewall.Allow_OpenVPN_Inbound.src=*
uci set firewall.Allow_OpenVPN_Inbound.proto=udp
uci set firewall.Allow_OpenVPN_Inbound.dest_port=1194

uci set firewall.Allow_OpenVPN_Inbound=rule

uci set firewall.Allow_OpenVPN_Inbound.target=ACCEPT

uci set firewall.Allow_OpenVPN_Inbound.src=*

uci set firewall.Allow_OpenVPN_Inbound.proto=udp

uci set firewall.Allow_OpenVPN_Inbound.dest_port=1194

Create firewall zone (named vpn) for the new vpn0 network. By default, it will allow both incoming and outgoing connections being created within the VPN tunnel. Edit the defaults as required. This does not (yet) allow clients to access the LAN or WAN networks, but allows clients to communicate with services on the router and may allow connections between VPN clients if your OpenVPN server configuration allows:

uci set firewall.vpn=zone
uci set firewall.vpn.name=vpn
uci set firewall.vpn.network=vpn0
uci set firewall.vpn.input=ACCEPT
uci set firewall.vpn.forward=REJECT
uci set firewall.vpn.output=ACCEPT
uci set firewall.vpn.masq=1

uci set firewall.vpn=zone

uci set firewall.vpn.name=vpn

uci set firewall.vpn.network=vpn0

uci set firewall.vpn.input=ACCEPT

uci set firewall.vpn.forward=REJECT

uci set firewall.vpn.output=ACCEPT

uci set firewall.vpn.masq=1

(Optional) If you plan to allow clients to connect to computers within your LAN, you’ll need to allow traffic to be forwarded between the vpn firewall zone and the lan firewall zone:

uci set firewall.vpn_forwarding_lan_in=forwarding
uci set firewall.vpn_forwarding_lan_in.src=vpn
uci set firewall.vpn_forwarding_lan_in.dest=lan

uci set firewall.vpn_forwarding_lan_in=forwarding

uci set firewall.vpn_forwarding_lan_in.src=vpn

uci set firewall.vpn_forwarding_lan_in.dest=lan

And you’ll probably want to allow your LAN computers to be able to initiate connections with the clients, too.

uci set firewall.vpn_forwarding_lan_out=forwarding
uci set firewall.vpn_forwarding_lan_out.src=lan
uci set firewall.vpn_forwarding_lan_out.dest=vpn

uci set firewall.vpn_forwarding_lan_out=forwarding

uci set firewall.vpn_forwarding_lan_out.src=lan

uci set firewall.vpn_forwarding_lan_out.dest=vpn

(Optional) Similarly, if you plan to allow clients to connect the internet (WAN) through the tunnel, you must allow traffic to be forwarded between the vpn firewall zone and the wan firewall zone:

uci set firewall.vpn_forwarding_wan=forwarding
uci set firewall.vpn_forwarding_wan.src=vpn
uci set firewall.vpn_forwarding_wan.dest=wan

uci set firewall.vpn_forwarding_wan=forwarding

uci set firewall.vpn_forwarding_wan.src=vpn

uci set firewall.vpn_forwarding_wan.dest=wan

Commit the changes:

uci commit network
/etc/init.d/network reload
uci commit firewall
/etc/init.d/firewall reload
echo &gt; /etc/config/openvpn # clear the openvpn uci config
uci set openvpn.myvpn=openvpn
uci set openvpn.myvpn.enabled=1
uci set openvpn.myvpn.verb=3
uci set openvpn.myvpn.port=1194
uci set openvpn.myvpn.proto=udp
uci set openvpn.myvpn.dev=tun
uci set openvpn.myvpn.server='10.8.0.0 255.255.255.0'
uci set openvpn.myvpn.keepalive='10 120'
uci set openvpn.myvpn.ca=/etc/openvpn/ca.crt
uci set openvpn.myvpn.cert=/etc/openvpn/my-server.crt
uci set openvpn.myvpn.key=/etc/openvpn/my-server.key
uci set openvpn.myvpn.dh=/etc/openvpn/dh2048.pem
uci commit openvpn

uci commit network

/etc/init.d/network reload

uci commit firewall

/etc/init.d/firewall reload

echo > /etc/config/openvpn # clear the openvpn uci config

uci set openvpn.myvpn=openvpn

uci set openvpn.myvpn.enabled=1

uci set openvpn.myvpn.verb=3

uci set openvpn.myvpn.port=1194

uci set openvpn.myvpn.proto=udp

uci set openvpn.myvpn.dev=tun

uci set openvpn.myvpn.server='10.8.0.0 255.255.255.0'

uci set openvpn.myvpn.keepalive='10 120'

uci set openvpn.myvpn.ca=/etc/openvpn/ca.crt

uci set openvpn.myvpn.cert=/etc/openvpn/my-server.crt

uci set openvpn.myvpn.key=/etc/openvpn/my-server.key

uci set openvpn.myvpn.dh=/etc/openvpn/dh2048.pem

uci commit openvpn

Now that you have finished your basic configuration, start up OpenVPN:

/etc/init.d/openvpn enable
/etc/init.d/openvpn start

1 2	/etc/init.d/openvpn enable /etc/init.d/openvpn start

**
So, your /etc/config/firewall shoud look like this (you can replace it with):

config defaults
        option syn_flood '1'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
config zone
        option name 'lan'
        option network 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'REJECT'
config zone
        option name 'wan'
        option network 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
config zone
        option name 'vpn'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
        option masq '1'
        option network 'vpn'
config forwarding
        option src 'lan'
        option dest 'wan'
config forwarding
        option src 'vpn'
        option dest 'lan'
config forwarding
        option src 'lan'
        option dest 'vpn'
config rule
        option name 'Allow-DHCP-Renew'
        option src 'wan'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'
config rule 'Allow_OpenVPN_Inbound'
        option target 'ACCEPT'
        option src '*'
        option proto 'udp'
        option dest_port '1194'

config defaults

option syn_flood '1'

option input 'ACCEPT'

option output 'ACCEPT'

option forward 'ACCEPT'

config zone

option name 'lan'

option network 'lan'

option input 'ACCEPT'

option output 'ACCEPT'

option forward 'REJECT'

config zone

option name 'wan'

option network 'wan'

option input 'REJECT'

option output 'ACCEPT'

option forward 'REJECT'

option masq '1'

option mtu_fix '1'

config zone

option name 'vpn'

option input 'ACCEPT'

option output 'ACCEPT'

option forward 'ACCEPT'

option masq '1'

option network 'vpn'

config forwarding

option src 'lan'

option dest 'wan'

config forwarding

option src 'vpn'

option dest 'lan'

config forwarding

option src 'lan'

option dest 'vpn'

config rule

option name 'Allow-DHCP-Renew'

option src 'wan'

option proto 'udp'

option dest_port '68'

option target 'ACCEPT'

option family 'ipv4'

config rule 'Allow_OpenVPN_Inbound'

option target 'ACCEPT'

option src '*'

option proto 'udp'

option dest_port '1194'

The client config:

dev tun
client
proto udp
log openvpn.log
remote 192.168.0.20
persist-key
persist-tun
verb 3
pull
keepalive 10 60
nobind
ca C:\\vpn\\ca.crt
cert C:\\vpn\\sapsd_client1.crt
key C:\\vpn\\sapsd_client1.key

dev tun

client

proto udp

log openvpn.log

remote 192.168.0.20

persist-key

persist-tun

verb 3

pull

keepalive 10 60

nobind

ca C:\\vpn\\ca.crt

cert C:\\vpn\\sapsd_client1.crt

key C:\\vpn\\sapsd_client1.key

Finally, I have added permanent route to the router’s subnet:

route add -p 192.168.1.0 mask 255.255.255.0 10.8.0.5

1	route add -p 192.168.1.0 mask 255.255.255.0 10.8.0.5

Please note, in case of every new vpn-client (I have single one) the server will provide a new gateway. Second client gets 10.8.0.9 instead of 10.8.0.5, third client will get 10.8.0.13 and so on (the mask is /30). In this way it’s strongly recommended to push the route from server as shown in the last line of server config (/etc/config/openvpn):

config openvpn 'myvpn'
        option enabled '1'
        option verb '3'
        option port '1194'
        option proto 'udp'
        option dev 'tun'
        option server '10.8.0.0 255.255.255.0'
        option keepalive '10 120'
        option ca '/etc/openvpn/ca.crt'
        option cert '/etc/openvpn/my-server.crt'
        option key '/etc/openvpn/my-server.key'
        option dh '/etc/openvpn/dh2048.pem'
        option status 'openvpn-status.log'
        option log '/var/log/openvpn.log'
        list push 'route 192.168.1.0 255.255.255.0'

config openvpn 'myvpn'

option enabled '1'

option verb '3'

option port '1194'

option proto 'udp'

option dev 'tun'

option server '10.8.0.0 255.255.255.0'

option keepalive '10 120'

option ca '/etc/openvpn/ca.crt'

option cert '/etc/openvpn/my-server.crt'

option key '/etc/openvpn/my-server.key'

option dh '/etc/openvpn/dh2048.pem'

option status 'openvpn-status.log'

option log '/var/log/openvpn.log'

list push 'route 192.168.1.0 255.255.255.0'

This behaviour can be reached using uci:

uci add_list openvpn.myvpn.push='route 192.168.1.0 255.255.255.0'
uci commit openvpn
/etc/init.d/openvpn reload

uci add_list openvpn.myvpn.push='route 192.168.1.0 255.255.255.0'

uci commit openvpn

/etc/init.d/openvpn reload

3 Comments

Igor
01.02.2015 @ 13:22

Здравствуйте!, не генерирует ключи для клиента на сервере, все время пишет:
…Please edit the vars script to reflect your configuration, then source it with „source ./vars“.
Как сгенерировать? чтобы не удалило существующие сертификаты и ключи?

- Uchla
  01.02.2015 @ 13:23
  
  Пишет же „source ./vars“.
  Перейдите в /etc/openvpn/easy-rsa2.0 и выполните команду „source ./vars“, затем снова ./build-key cliXXX
  
Uchla
26.03.2018 @ 20:07

Чтобы установить OpenVPN-сервер/клиент на Zyxel Keenetic Omni (Черный) по инструкции habr.ru/post/306378
распакуйте на флешку файл pkg.entware-keenetic.ru/binaries/keenle/installer/installer-keenle.tar.gz и в поле „Сценарий initrc“ укажите /opt/etc/init.d/doinstall

LAN access through OpenWRT OpenVPN server

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