MoeSocks

A SOCKS5 proxy using the client / server architecture.

MoeSocks is greatly inspired by ss and can be used in place of it.

Installation

Easy

Install Nix

curl https://nixos.org/nix/install | sh 

Install moesocks

nix-env -i -A nixpkgs.haskellPackages.moesocks

Hard

Install GHC 7.10.2 and cabal-install

Download moesocks

git clone https://github.com/nfjinjing/moesocks

Sandbox!

cd moesocks
cabal sandbox init

Install

cabal install

Run

.cabal-sandbox/bin/moesocks

Usage

• Start a remote node outside a firewall:

    moesocks -r remote -k birthday!
  

• Start a local node inside a firewall:

    moesocks -s $REMOTE_IP -k birthday!
  

• Now you have a SOCKS5 proxy running inside a firewall using port 1080.

• SS compatible obfuscation can be turned on with the -o flag to make statistical analysis on packet length a bit more confusing.

• See more options:

    moesocks --help
  

• You might want to run moesocks under some kind of a supervising daemon to auto restart the program if it crashes, likely due to #10590, the fix of which was not included in the 7.10.2 release.

• On OSX, If you only run moesocks -r local, then it should work. Occasional manual restart should be expected. fastOpen field should be false for now.

Features

• SOCKS5 proxy service, obviously
• TCP port forwarding
• UDP port forwarding, for example -U 5300:8.8.8.8:53
• TCP per connection throttling (as a side effect of trying to find a bug in the remote)
• SOCKS5 service on local can be turned off
• Understand ss's configuration file

Drawbacks

• UDP over SOCKS5 is not implemented.
• TCP bind over SOCKS5 is not implemented
• More then 2 times slower then the original Python implementation (measured at 20M/s vs 43M/s on an Intel P8800, using the AES-256-CFB method, in software AES).
• Currently only works on Unix.

TCP Fast Open (TFO)

TFO is perfect for proxies.

Both local and remote will use TFO when instructed. If the browser in use and the website to visit both support TFO, you can enjoy TFO all the way through. This could lead to a huge reduction of latency.

Enable TFO in your OS runtime.

On Linux 3.7+, to check the availability of TFO:

cat /proc/sys/net/ipv4/tcp_fastopen

On Linux 3.7+, to enable TFO (as root):

echo 3 > /proc/sys/net/ipv4/tcp_fastopen

Enable TFO in MoeSocks

TFO can be turned on by adding a "fastOpen":true field in config.json or specifying a --fast-open flag in the command line arguments.

Verify

Use tcpdump on the remotePort, check for that SYN should start to carry payload. An example command is:

tcpdump port 8388 -i any -X -v

Credits

• ss greatly inspired MoeSocks.
• ss-haskell another implementation of ss in Haskell, also greatly inspired MoeSocks. Much of the understanding of the internal of ss was gained by reading ss-haskell.

License

Copyright 2015 Jinjing Wang

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.