diff options
Diffstat (limited to '')
| -rw-r--r-- | content/blog/OpenBSD/wireguard.md | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/content/blog/OpenBSD/wireguard.md b/content/blog/OpenBSD/wireguard.md new file mode 100644 index 0000000..d15c625 --- /dev/null +++ b/content/blog/OpenBSD/wireguard.md @@ -0,0 +1,96 @@ +--- +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. |