shadowsocks-libev

Intro

Shadowsocks-libev is a lightweight secured scoks5 proxy for embedded devices and low end boxes.

It is a port of shadowsocks created by @clowwindy maintained by @madeye.

Current version: 1.4.0 |

Changelog

1.4.0 -- Sun, 08 Sep 2013 02:20:40 +0000

• Add standard socks5 udp support.

1.3.3 -- Fri, 21 Jun 2013 09:59:20 +0800

• Provide more info in verbose mode.

1.3.2 -- Sun, 09 Jun 2013 09:52:31 +0000

• Fix some ciphers by @linusyang.

1.3.1 -- Tue, 04 Jun 2013 00:56:17 +0000

• Support more cihpers: camellia, idea, rc2 and seed.

1.3 -- Thu, 16 May 2013 10:51:15 +0800

• Able to bind connections to specific interface
• Support more ciphers: aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb, cast5-cfb, des-cfb

1.2 -- Tue, 07 May 2013 14:10:33 +0800

• Close timeouted TCP connections
• Fix a high load issue

1.1 -- Wed, 10 Apr 2013 12:11:36 +0800

• Fix a IPV6 resolve issue

1.0 -- Sat, 06 Apr 2013 16:59:15 +0800

• Initial release

Features

Shadowsocks-libev is writen in pure C and only depends on libev and openssl.

In normal usage, the memory consumption is about 600KB and the CPU utilization is no more than 5% on a low-end router (Buffalo WHR-G300N V2 with a 400MHz MIPS CPU, 32MB memory and 4MB flash).

Installation

For Unix-like systems, especially Debian-based systems, e.g. Ubuntu, Debian or Linux Mint, you can build the binary like this:

    sudo apt-get install build-essential autoconf libtool libssl-dev
    ./configure && make
    sudo make install

For Windows, use either MinGW (msys) or Cygwin to build. At the moment, only ss-local is supported to build against MinGW (msys).

If you are using MinGW (msys), please download OpenSSL source tarball to the home directory of msys, and build it like this (may take a few minutes):

    tar zxf openssl-1.0.1e.tar.gz
    cd openssl-1.0.1e
    ./config --prefix="$HOME/prebuilt" --openssldir="$HOME/prebuilt/openssl"
    make && make install

Then, build the binary using the commands below, and all .exe files will be built at $HOME/ss/bin:

    ./configure --prefix="$HOME/ss" --with-openssl="$HOME/prebuilt"
    make && make install

Usage

usage:

ss-[local|redir|server]
      -s <server_host>           host name or ip address of your remote server
      -p <server_port>           port number of your remote server
      -l <local_port>>           port number of your local server
      -k <password>              password of your remote server

      [-m <encrypt_method>]      encrypt method, supporting table, rc4,
                                 aes-128-cfb, aes-192-cfb, aes-256-cfb,
                                 bf-cfb, camellia-128-cfb, camellia-192-cfb,
                                 camellia-256-cfb, cast5-cfb, des-cfb,
                                 idea-cfb, rc2-cfb and seed-cfb
      [-f <pid_file>]            valid path to the pid file
      [-t <timeout>]             socket timeout in seconds
      [-c <config_file>]         json format config file

      [-i <interface>]           specific network interface to bind,
                                 only avaliable in local and server modes
      [-b <local_address>]       specific local address to bind,
                                 only avaliable in local and redir modes
      [-u]                       udprelay mode to supprot udp traffic
                                 only avaliable in local and server modes
      [-v]                       verbose mode, debug output in console

notes:

    ss-redir provides a transparent proxy function and only works on the 
    Linux platform with iptables.

Advanced usage

The latest shadowsocks-libev has provided a redir mode. You can configure your linux based box or router to proxy all tcp traffic transparently.

# Create new chain
root@Wrt:~# iptables -t nat -N SHADOWSOCKS

# Ignore your shadowsocks server's addresses
# It's very IMPORTANT, just be careful.
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 123.123.123.123 -j RETURN

# Ignore LANs and any other addresses you'd like to bypass the proxy
# See Wikipedia and RFC5735 for full list of reserved networks.
# See ashi009/bestroutetb for a highly optimized CHN route list.
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN

# Anything else should be redirected to shadowsocks's local port
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -p tcp -j REDIRECT --to-ports 12345

# Apply the rules
root@Wrt:~# iptables -t nat -A OUTPUT -p tcp -j SHADOWSOCKS

# Start the shadowsocks-redir
root@Wrt:~# ss-redir -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid

Security Tips

Although shadowsocks-libev can handle thousands of concurrent connections nicely, we still recommend to set up your server's firewall rules to limit connections from each user.

# Up to 32 connections are enough for normal usages
iptables -A INPUT -p tcp --syn --dport ${SHADOWSOCKS_PORT} -m connlimit --connlimit-above 32 -j REJECT --reject-with tcp-reset

License

Copyright (C) 2013 Max Lv max.c.lv@gmail.com

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.