Wireguard

WireGuard 是一种实现加密虚拟专用网络(VPN)的通信协议和免费开源软件，通过 UDP 传递流量，旨在比 IPsec 和 OpenVPN 这两种常见的隧道协议具有更好的性能和更强大的功能，其设计目标是易于使用、高速性能和低攻击面；

服务端

0. Sys Conf

# /etc/sysctl.conf
net.ipv4.ip_forward = 1

wireguard

apt install wireguard

2. 生成秘钥对

wg genkey | tee server_privatekey | wg pubkey > server_publickey
wg genkey | tee u01_privatekey | wg pubkey > u01_publickey
wg genkey | tee u02_privatekey | wg pubkey > u02_publickey

3. 配置文件生成

服务配置

# Server: /etc/wireguard/wg0.conf
serverip=$(curl ipv4.icanhazip.com)
port=17731
eth=$(ls /sys/class/net | awk '/^e/{print}')
wg0=$(cat server_publickey)
wg0p=$(cat server_privatekey)
u01=$(cat u01_publickey)
u02=$(cat u02_publickey)
u01p=$(cat u01_privatekey)
u02p=$(cat u02_privatekey)

cat > wg0.conf <<-EOF
[Interface]
PrivateKey = $wg0p
Address = 10.0.0.1/32
PostUp   = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -A FORWARD -o wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o $eth -j MASQUERADE
PostDown = iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o $eth -j MASQUERADE
ListenPort = $port
DNS = 8.8.8.8
MTU = 1420

[Peer]
PublicKey = $u01
AllowedIPs = 10.0.0.10/32
[Peer]
PublicKey = $u02
AllowedIPs = 10.0.0.20/32
EOF

连接配置

# Client： /etc/wireguard/u01.conf
cat > u01.conf <<-EOF
[Interface]
PrivateKey = $u01p
Address = 10.0.0.10/24
DNS = 8.8.8.8
MTU = 1420

[Peer]
PublicKey = $wg0
Endpoint = $serverip:$port
AllowedIPs = 0.0.0.0/0, ::0/0
PersistentKeepalive = 25
EOF

客户端导入此文件或扫描此文件生成的二维码即可。

# apt install qrencode
# 在 Linux ssh 窗口中显示二维码
cat u01.conf | qrencode -o - -t UTF8

启动

wg-quick up wg0
# shutdown
wg-quick down wg0
# status
wg

配置启动服务（可选）

# systemctl start wireguard
# /etc/init.d/wireguard
#!/bin/bash
### BEGIN INIT INFO
# Provides:		wgstart
# Required-Start:	$remote_fs $syslog
# Required-Stop:    $remote_fs $syslog
# Default-Start:	2 3 4 5
# Default-Stop:		0 1 6
# Short-Description:	wireguard
### END INIT INFO
wg-quick up wg0

chmod +x /etc/init.d/wireguard
cd /etc/init.d
update-rc.d wireguard defaults

客户端

Windows 下载（Mac/IOS 从 App Store 下载） wireguard，扫描二维码或导入从服务端创建的客户端文件即可。

Error

Warning: ?? is world accessible

This means that the configuration file permissions are too broad - and they shouldn’t, as there’s a private key in there. This can be fixed with

chmod 600 /etc/wireguard/wg0.conf

resolvconf: command not found

/usr/bin/wg-quick: line 32: resolvconf: command not found
如果是在 shell 里执行命令，一般在 .bash_profile, .bashrc 等文件中的环境变量不会带进来，需要执行 source ~/.bashrc 等命令。或者：
export PATH=$PATH:/sbin:/usr/sbin   # resolvconf 在 /usr/sbin