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如何设置 OpenVPN 服务器以像代理一样工作

tag-icon • tag-icon networking iptables vpn openvpn
如何设置 OpenVPN 服务器以像代理一样工作

我正在尝试在 Amazon EC2 上设置 openvpn。为了检查它，我使用http://whatismyipaddress.com。

目前我可以使用以下方式连接到我的远程服务器：

sudo openvpn --config /etc/openvpn/openvpnuser1.conf

连接后服务器日志有：

Sun Jun 11 08:44:06 2017 us=235368 GET INST BY REAL: 176.XX.193.73:54967 [succeeded]
Sun Jun 11 08:44:06 2017 us=235386 user1/176.XX.193.73:54967 UDPv4 READ [69] from [AF_INET]176.XX.193.73:54967: P_DATA_V1 kid=0 DATA 117650fd 4f53ac24 d1614c31 f40cd5d1 49c86aa0 066fc87e 7e1db1fb 47321f9[more...]
Sun Jun 11 08:44:06 2017 us=235393 user1/176.XX.193.73:54967 TLS: tls_pre_decrypt, key_id=0, IP=[AF_INET]176.XX.193.73:54967
Sun Jun 11 08:44:06 2017 us=235405 user1/176.XX.193.73:54967 DECRYPT IV: 066fc87e 7e1db1fb 47321f94 d4f764ee
Sun Jun 11 08:44:06 2017 us=235416 user1/176.XX.193.73:54967 DECRYPT TO: 00000008 fa2a187b f3641eb4 cb07ed2d 0a981fc7 48
Sun Jun 11 08:44:06 2017 us=235425 user1/176.XX.193.73:54967 PID_TEST [0] [SSL-0] [>EEEEEE] 0:7 0:8 t=1497170646[0] r=[0,64,15,0,1] sl=[57,7,64,528]
Sun Jun 11 08:44:06 2017 us=235431 user1/176.XX.193.73:54967 RECEIVED PING PACKET
Sun Jun 11 08:44:06 2017 us=235437 PO_CTL rwflags=0x0001 ev=4 arg=0x55687fb01180
Sun Jun 11 08:44:06 2017 us=235441 PO_CTL rwflags=0x0001 ev=5 arg=0x55687fb01068
Sun Jun 11 08:44:06 2017 us=235448 I/O WAIT TR|Tw|SR|Sw [8/142628]

客户端还增加了附加接口并获得了 IP 地址（ifconfig）：

tun1      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:10.0.0.6  P-t-P:10.0.0.5  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

因此，我假设 openvpn 连接已建立。但不幸的是http://whatismyipaddress.com仍然显示我的（客户端）真实 IP 地址。

客户端配置：

client
dev tun
proto udp
remote 52.XX.48.224 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca /etc/openvpn/ca.crt
cert /etc/openvpn/user1.crt
key /etc/openvpn/user1.key
tls-auth /etc/openvpn/ccd/ta.key 1
cipher AES-256-CBC
ns-cert-type server
comp-lzo
log /var/log/openvpn.log
verb 3
sndbuf 0
rcvbuf 0

服务器配置：

port 1194
proto udp
dev tun
ca /etc/openvpn/ca.crt
cert /etc/openvpn/ServerV1.crt
key /etc/openvpn/ServerV1.key
dh /etc/openvpn/dh2048.pem
tls-auth /etc/openvpn/ccd/ta.key 0
cipher AES-256-CBC
server 10.0.0.0 255.255.255.0
keepalive 10 120
persist-key
persist-tun
client-config-dir /etc/openvpn/ccd
status ServerV1-status.log
log /var/log/ServerV1.log
sndbuf 0
rcvbuf 0
push "redirect-geteway def1"
push "dhcp-options DNS 8.8.8.8"
comp-lzo
verb 15

已启用服务器转发

cat /proc/sys/net/ipv4/conf/all/forwarding
1

iptables 编辑如下：

iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -o eth1 -j MASQUERADE
iptables -L -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  ip-10-0-0-0.eu-central-1.compute.internal/24  anywhere

答案1

您的服务器配置似乎有一个拼写错误：

    push "redirect-geteway def1"

应该

    push "redirect-gateway def1"

这很可能是客户端在建立隧道后不设置默认路由的原因。

希望能帮助到你！

答案2

嗯。我觉得你可能想在你的 iptables 配置中更明确一点。

#Allow new OpenVPN connections from the outside
iptables -A INPUT -i eth1 -m state --state NEW -p udp --dport 1194 -j ACCEPT
# Allow all tun interfaces to talk to me
iptables -A input -i tun+ -j ACCEPT
# And to talk through me
iptables -A FORWARD -i tun+ -j ACCEPT
iptables -A FORWARD -i tun+ -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth1 -o tun+ -m state --state RELATED,ESTABLISHED -j ACCEPT

在您的配置顶部应该可以修复您的问题...您在所有地方的默认策​​略都是接受，并且您的伪装线对我来说看起来没问题...一旦确定了协议（0 RX/0 TX），您的流量就不会通过隧道，因为您没有在输入链中添加任何内容....

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