96 lines
3.4 KiB
Markdown
96 lines
3.4 KiB
Markdown
---
|
|
title: Wireguard on OpenBSD
|
|
description: How to configure a wireguard endpoint on OpenBSD
|
|
date: 2023-02-15
|
|
tags:
|
|
- OpenBSD
|
|
- vpn
|
|
- wireguard
|
|
---
|
|
|
|
## Introduction
|
|
|
|
This article explains how to configure wireguard on OpenBSD.
|
|
|
|
I chose to kick off this wireguard series with OpenBSD because it is the cleanest and the better integrated of all operating systems that support wireguard.
|
|
|
|
## Installation
|
|
|
|
OpenBSD does things elegantly as usual : where linux distributions have a service, OpenBSD has a simple `/etc/hostname.wg0` file. The interface is therefore managed without any tool other than the standard ifconfig, it's so simple and elegant!
|
|
|
|
If you want you can still install the usual tooling with:
|
|
```sh
|
|
pkg_add wireguard-tools
|
|
```
|
|
|
|
## Generating keys
|
|
|
|
The private and public keys for a host can be generated with the following commands:
|
|
```sh
|
|
PRIVATE_KEY=`wg genkey`
|
|
PUBLIC_KEY=`printf $PRIVATE_KEY|wg pubkey`
|
|
echo private_key: $PRIVATE_KEY
|
|
echo public_key: $PUBLIC_KEY
|
|
```
|
|
|
|
Private keys can also be generated with the following command if you do not wish to use the `wg` tool:
|
|
```sh
|
|
openssl rand -base64 32
|
|
```
|
|
|
|
I am not aware of an openssl command to extract the corresponding public key, but after setting up your interface `ifconfig` will kindly show it to you.
|
|
|
|
## Configuration
|
|
|
|
Here is a configuration example of my `/etc/hostname.wg0` that creates a tunnel listening on udp port 342 and several peers :
|
|
```cfg
|
|
wgport 342 wgkey '4J7O3IN7+MnyoBpxqDbDZyAQ3LUzmcR2tHLdN0MgnH8='
|
|
10.1.2.1/24
|
|
wgpeer 'LWZO5wmkmzFwohwtvZ2Df6WAvGchcyXpzNEq2m86sSE=' wgaip 10.1.2.2/32
|
|
wgpeer 'SjqCIBpTjtkMvKtkgDFIPJsAmQEK/+H33euekrANJVc=' wgaip 10.1.2.4/32
|
|
wgpeer '4CcAq3xqN496qg2JR/5nYTdJPABry4n2Kon96wz981I=' wgaip 10.1.2.8/32
|
|
wgpeer 'vNNic3jvXfbBahF8XFKnAv9+Cef/iQ6nWxXeOBtehgc=' wgaip 10.1.2.6/32
|
|
up
|
|
```
|
|
|
|
Your private key goes on the first line as argument to `wgkey`, the other keys are public keys for each peer. As all other hostname interface files on OpenBSD, each line is a valid argument you could pass the `ifconfig` command.
|
|
|
|
To re-read the interface configuration, use :
|
|
```sh
|
|
sh /etc/netstart wg0
|
|
```
|
|
|
|
## Administration
|
|
|
|
The tunnel can be managed with the standard `ifconfig` command:
|
|
```sh
|
|
root@yen:~# ifconfig wg0
|
|
wg0: flags=80c3<UP,BROADCAST,RUNNING,NOARP,MULTICAST> mtu 1420
|
|
index 4 priority 0 llprio 3
|
|
wgport 342
|
|
wgpubkey R4A01RXXqRJSY9TiKQrZGR85HsFNSXxhRKKEu/bEdTQ=
|
|
wgpeer LWZO5wmkmzFwohwtvZ2Df6WAvGchcyXpzNEq2m86sSE=
|
|
wgendpoint 90.66.117.156 1024
|
|
tx: 158515972, rx: 151576036
|
|
last handshake: 93 seconds ago
|
|
wgaip 10.1.2.2/32
|
|
wgpeer SjqCIBpTjtkMvKtkgDFIPJsAmQEK/+H33euekrANJVc=
|
|
wgendpoint 90.66.117.156 51110
|
|
tx: 30969024, rx: 14034688
|
|
last handshake: 9527 seconds ago
|
|
wgaip 10.1.2.4/32
|
|
wgpeer 4CcAq3xqN496qg2JR/5nYTdJPABry4n2Kon96wz981I=
|
|
wgendpoint 90.66.117.156 46247
|
|
tx: 36877516, rx: 19036472
|
|
last handshake: 23 seconds ago
|
|
wgaip 10.1.2.8/32
|
|
wgpeer vNNic3jvXfbBahF8XFKnAv9+Cef/iQ6nWxXeOBtehgc=
|
|
wgendpoint 90.66.117.156 1025
|
|
tx: 150787792, rx: 146836696
|
|
last handshake: 43 seconds ago
|
|
wgaip 10.1.2.6/32
|
|
groups: wg
|
|
inet 10.1.2.1 netmask 0xffffff00 broadcast 10.1.2.255
|
|
```
|
|
|
|
Alternatively you can also use the `wg` tool if you installed it.
|