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 and @linusyang.

Current version: 1.4.8 | | Changelog

Features

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

In normal usage, the memory footprint 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

Notes about PolarSSL

• Default crypto library is OpenSSL. To build against PolarSSL, specify --with-crypto-library=polarssl and --with-polarssl=/path/to/polarssl when running ./configure.
• PolarSSL 1.2.5 or newer is required. Currently, PolarSSL does NOT support CAST5-CFB, DES-CFB, IDEA-CFB, RC2-CFB and SEED-CFB.
• RC4 is only support by PolarSSL 1.3.0 or above.

Debian & Ubuntu

Install from repository

Add either of the following lines to your /etc/apt/sources.list

# Debian Wheezy, Ubuntu 12.04 or any distribution with libssl > 1.0.1
deb http://shadowsocks.org/debian wheezy main

# Debian Squeeze, Ubuntu 11.04, or any distribution with libssl > 0.9.8, but < 1.0.0
deb http://shadowsocks.org/debian squeeze main

Then,

sudo apt-get update
sudo apt-get install shadowsocks

Build package from source

cd shadowsocks-libev
sudo apt-get install build-essential autoconf libtool libssl-dev gawk debhelper
sudo dpkg-buildpackage
cd ..
sudo dpkg -i shadowsocks*.deb

Configure and start the service

# Edit the configuration
sudo vim /etc/shadowsocks/config.json

# Start the service
sudo /etc/init.d/shadowsocks start

CentOS

Install the dependencies,

yum install -y gcc automake autoconf libtool make build-essential autoconf libtool 
yum install -y curl curl-devel zlib-devel openssl-devel perl perl-devel cpio expat-devel gettext-devel

Compile and install,

./configure && make
make install

Then copy this init script to /etc/init.d/.

Linux

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

FreeBSD

su
cd /usr/ports/net/shadowsocks-libev
make install

Edit your config.json file. By default, it's located in /usr/local/etc/shadowsocks-libev

To enable shadowsocks-libev, add the following rc variable to your /etc/rc.conf file.

shadowsocks_libev_enable="YES"

Start the shadowsocks server:

service shadowsocks_libev start

OpenWRT

# At OpenWRT build root
pushd package
git clone https://github.com/madeye/shadowsocks-libev.git
popd

# Enable shadowsocks-libev in network category 
make menuconfig

# Optional
make -j

# Build the package
make V=99 package/shadowsocks-libev/openwrt/compile

Windows

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 or PolarSSL source tarball to the home directory of msys, and build it like this (may take a few minutes):

• OpenSSL

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

• PolarSSL

tar zxf polarssl-1.3.2-gpl.tgz
cd polarssl-1.3.2
make lib WINDOWS=1
make install DESTDIR="$HOME/prebuilt"

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

• OpenSSL

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

• PolarSSL

./configure --prefix="$HOME/ss" --with-crypto-library=polarssl --with-polarssl=$HOME/prebuilt
make && make install

Usage

usage:

    ss-[local|redir|server|tunnel]

          -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: table, rc4, rc4-md5
                                     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>]            file to store the pid
          [-t <timeout>]             socket timeout in seconds
          [-c <config_file>]         config file in json


          [-i <interface>]           network interface to bind,
                                     not available in redir mode
          [-b <local_address>]       local address to bind,
                                     not available in server mode
          [-u]                       enable udprelay mode
                                     not available in redir mode
          [-L <addr>:<port>]         setup a local port forwarding tunnel,
                                     only available in tunnel mode
          [-v]                       verbose mode


          [--fast-open]              enable TCP fast open,
                                     only available on Linux kernel > 3.7.0
          [--acl <acl_file>]         config file of ACL (Access Control List)

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) 2014 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/.