Transparent and stable proxy based on shadowsocks

I spent a day to do some nasty work that bother to do. The linkage in our country to others goes worse day by day due to security issue. I cannot stand enduring this time-wasting problem. So, I decided to solve it once for all.

I have heard shadowsocks for some time, but didn't use it because it requires special program on both server and client. My friends told me it is much more stable than VPN of any kind, it's also fast and can handle thousands of connections in the same time. So, I decided to take a shot.

To my surprise, the installation is easy, like other third-party packages on server, I finished it in 5 minutes. The configuration on my mac is also simple. Download the ShadowsocksX and set the server address, port, password and encryption methods is all of the job. ShadowsocksX is a PAC, it will set the address in your system after startup. Programs on your mac may use PAC as proxy server. PAC contains a list of address for blocked url patterns to go through your shadowsocks server. It is useful in most of the conditions, but I wonder is there any way to redirect all of the traffic in my home to the proxy server if necessary.

What I meant the traffic in my home is that I want every machine, including my iPhone, iPad, Mac, servers, laptops and much more share one shadowsocks server without any configuration on the devices. The only way to achieve this goal is to do the job on the router.

After did some research with Google, I found a C programming language port of shadowsocks named shadowsocks-libev contains one component designed especially for this use. This port also contains server component. So I removed the original python one and redeployed the C port.

The basic concept of what I will do on my router is to use iptables to redirect every traffic from foreign countries to the shadowsocks proxy as client of my shadowsocks server in the US.

The proxy in the router to connect to the shadowsocks server in the US is a program named ss-redir. It use the same configuration contents of the server, and you need to pay attention to the "local_port" because it will be used later in the iptables configurations. After setting up the parameters and start the redir correctly. We can redirect the traffics from all of the devices in the network to proxy. But we don't want all of the traffic go through the proxy because all of the server in China are not affected by the national firewall. So, we also need to add exceptions to the iptables.

This manual is pretty clear about the whole procedure, I use this exceptions below to diverge uplink from Asia and other places.

# Ignore LANs IP address
iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN

# Ignore Asia IP address
iptables -t nat -A SHADOWSOCKS -d 1.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 14.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 27.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 36.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 39.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 42.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 49.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 58.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 59.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 60.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 61.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 101.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 103.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 106.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 110.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 111.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 112.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 113.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 114.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 115.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 116.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 117.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 118.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 119.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 120.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 121.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 122.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 123.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 124.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 125.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 126.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 169.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 175.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 180.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 182.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 183.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 202.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 203.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 210.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 211.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 218.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 219.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 220.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 221.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 222.0.0.0/8 -j RETURN
iptables -t nat -A SHADOWSOCKS -d 223.0.0.0/8 -j RETURN

Now I can enjoy the true internet. Although it is not fast enough, but acceptable for basic use. My VPS may use a lot more traffic after this, hope the quota wont exceed.

Snip20150730_3

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