147 lines
4.3 KiB
Markdown
147 lines
4.3 KiB
Markdown
---
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title: Wireguard
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visible: true
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---
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[toc]
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## Installation
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`# pacman -S wireguard-tools`
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_Enable backports for buster and older_
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`# apt install wireguard`
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## Configuration
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This command creates a private key and also a matching public key
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`$ wg genkey | tee (name).key | wg pubkey > (name).pub`
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The network we will be using for wireguard will be 172.16.1.0/24
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To activate a wireguard tunnel on boot use the following command
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`# systemctl enable --now wg-quick@wg0.service`
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### VPN "Server" configuration
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_Illustration only, don't share your private keys_
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Private key: `oFlgQ3uq4tjgRILDV3Lbqdx0mVZv2VCWWRkhJA3gcX4=`
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Public key: `/0LMRaQCx1oMIh+eU/v4T3YQ8gAb/Qf7ulYl0zzFAkQ=`
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This server needs to have a public IP.
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All traffic between the different nodes will be routed through here.
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Kernel forwarding has to be enabled
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SystemD only loads settings specified in the `/etc/sysctl.d/` directory
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`# echo "net.ipv4.ip_forward=1" >> /etc/sysctl.d/80-forwarding.conf`
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`# sysctl -p /etc/sysctl.d/80-forwarding.conf`
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Note how the first peer has two allowed IPs.
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`/etc/wireguard/wg0.conf`
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```
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[Interface]
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Address = 172.16.1.10/24
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ListenPort = 51900
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PrivateKey = oFlgQ3uq4tjgRILDV3Lbqdx0mVZv2VCWWRkhJA3gcX4=
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MTU = 1420
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PostUp = /etc/wireguard/wg0-postup.sh
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PostDown = /etc/wireguard/wg0-postdown.sh
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[Peer]
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PublicKey = r+TAbAN1hGh4MaIk/J5I5L3ZSAn+kCo1MJJq5YxHrl0=
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AllowedIPs = 172.16.1.100/32, 172.16.1.69/32
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[Peer]
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PublicKey = RYXavpsPkJ8jwiBI39kz1csqgMDtVK14Lo2u8pDL0UY=
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AllowedIPs = 172.16.1.101/32
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[Peer]
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PublicKey = 0jDtfR5GlZAHWtwxVEpukjneVj/Ace40VVdHh/eZnwU=
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AllowedIPs = 172.16.1.200/32
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```
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`/etc/wireguard/wg0-postup.sh`
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```sh
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WIREGUARD_INTERFACE=wg0
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WIREGUARD_LAN=172.16.1.0/24
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MASQUERADE_INTERFACE=ens33
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iptables -t nat -I POSTROUTING -o $MASQUERADE_INTERFACE -j MASQUERADE -s $WIREGUARD_LAN
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# Add a WIREGUARD_wg0 chain to the FORWARD chain
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CHAIN_NAME="WIREGUARD_$WIREGUARD_INTERFACE"
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iptables -N $CHAIN_NAME
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iptables -A FORWARD -j $CHAIN_NAME
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# Accept related or established traffic
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iptables -A $CHAIN_NAME -o $WIREGUARD_INTERFACE -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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# Accept traffic from (source) to (destination)
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#iptables -A $CHAIN_NAME -s 172.16.1.100 -i $WIREGUARD_INTERFACE -d 172.16.1.10 -j ACCEPT
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#iptables -A $CHAIN_NAME -s 172.16.1.101 -i $WIREGUARD_INTERFACE -d 172.16.1.10 -j ACCEPT
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#iptables -A $CHAIN_NAME -s 172.16.1.200 -i $WIREGUARD_INTERFACE -d 172.16.1.10 -j ACCEPT
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#iptables -A $CHAIN_NAME -s 172.16.1.200 -i $WIREGUARD_INTERFACE -d 172.16.1.100 -j ACCEPT
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# Accept all traffic on the wireguard network
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iptables -A $CHAIN_NAME -s 172.16.1.0/24 -i $WIREGUARD_INTERFACE -j ACCEPT
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# Drop everything else coming through the Wireguard interface
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iptables -A $CHAIN_NAME -i $WIREGUARD_INTERFACE -j DROP
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# Return to FORWARD chain
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iptables -A $CHAIN_NAME -j RETURN
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```
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`/etc/wireguard/wg0-postdown.sh`
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```sh
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WIREGUARD_INTERFACE=wg0
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WIREGUARD_LAN=172.16.1.0/24
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MASQUERADE_INTERFACE=ens33
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CHAIN_NAME="WIREGUARD_$WIREGUARD_INTERFACE"
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iptables -t nat -D POSTROUTING -o $MASQUERADE_INTERFACE -j MASQUERADE -s 172.16.1.0/24
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# Remove and delete the WIREGUARD_wg0 chain
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iptables -D FORWARD -j $CHAIN_NAME
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iptables -F $CHAIN_NAME
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iptables -X $CHAIN_NAME
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```
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### VPN "Client" configuration
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_Illustration only, don't share your private keys_
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Private key: `kAgCeU6l+RWlFxfpnGj19tzEDyYz3I4HuqHkaUmHX1Q=`
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Public key: `r+TAbAN1hGh4MaIk/J5I5L3ZSAn+kCo1MJJq5YxHrl0=`
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Here we have two different interfaces configured under the same wireguard config
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`/etc/wireguard/wg0.conf`
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```
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[Interface]
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Address = 172.16.1.100/24
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ListenPort = 51900
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PrivateKey = kAgCeU6l+RWlFxfpnGj19tzEDyYz3I4HuqHkaUmHX1Q=
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MTU = 1420
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[Interface]
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Address = 172.16.1.69/24
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ListenPort = 51900
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PrivateKey = kAgCeU6l+RWlFxfpnGj19tzEDyYz3I4HuqHkaUmHX1Q=
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MTU = 1420
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[Peer]
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PublicKey = /0LMRaQCx1oMIh+eU/v4T3YQ8gAb/Qf7ulYl0zzFAkQ=
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AllowedIPs = 172.16.1.0/24
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Endpoint = 10.80.4.124:51900 #IPv4
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#Endpoint = 864f:909a:4779::b:5e1b:51900 #IPv6
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PersistentKeepalive = 5
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```
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## Iptables no local access ssh user
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> [Block outgoing network access for single user](https://www.cyberciti.biz/tips/block-outgoing-network-access-for-a-single-user-from-my-server-using-iptables.html)
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> [Restrict internet access for user](https://unix.stackexchange.com/questions/21650/how-to-restrict-internet-access-for-a-particular-user-on-the-lan-using-iptables)
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