Gatekeeper: A [SOCKS5] Server written in Rust.

Features

Authentication Method

Any authentication method is not supported.

The client connects to the server is required for sending X'00' (NO AUTHENTICATION REQUIRED) as a method selection message.

Command

Only CONNECT command is supported.

Filter

Gatekeeper allow users to restricting connection based on:

• target address
  • ip address (subnet range)
  • domain name (regex matching)
• port number
• protocol (currently, tcp is only supported)

Install

You can install gatekeeper as an executable (gatekeeperd) from git repository.

$ cargo install --locked --git https://github.com/Idein/gatekeeper.git $ gatekeeperd gatekeeperd gatekeeper 0.1.0

How to use

When the gatekeeperd installation is complete, you would be able to run the program.

$ gatekeeperd

You can look see command line options.

$ gatekeeperd --help

Filter Rule

By default, gatekeeper accepts all connection requests. However, it is possible to filter out some requests along with a filtering rule (described above) given an yaml file. This yaml file follows special format described below.

Format

Any filter rule yaml is constructed from a sequence of RuleEntries. Each RuleEntry is either Allow or Deny.

```yaml

• Allow: ..
• Deny: ..
• Deny: ..
• Allow: .. .. ```

The rule is in the back of this list have higher precedence. Then the head of rules is treated as default rule, and the rule should be either allow all connection or deny all connection.

yaml - Allow: address: Any port: Any protocol: Any ..

Or

yaml - Deny: address: Any port: Any protocol: Any ..

All RuleEntry have 3 fields address, port and protocol. Value of these fields are either Any or Specif. Any matches any values, and Specif matches a specified value(s).

• address

  ```yaml

  any address

  address: Any ```

  address is either IpAddr or Domain.

  ```yaml

  192.168.0.1/24

  address: Specif: IpAddr: addr: 192.168.0.1 mask: 24 ```

  ```yaml

  {mail.,}google.{com,co.jp}

  address: Specif: Domain: # regexp pattern pattern: "(mail.)?google.(com|co.jp)" ```

• port

  ```yaml

  any port number

  port: Any ```

  ```yaml

  match only 8080

  port: Specif: 8080 ```

• protocol

  ```yaml

  any protocol

  protocol: Any ```

  ```yaml

  match only tcp

  protocol: Specif: Tcp ```

Examples

• allow all connections

  ```yaml

  • Allow: address: Any port: Any protocol: Any ```

• allow only local subnet (192.168.0.1/16)

  ```yaml

  .. default deny ..

  • Allow: address: Specif: IpAddr: addr: 192.168.0.1 mask: 16 port: Any protocol: Any ```

• block access to facebook.com and youtube.com

  ```yaml

  .. default allow ..

  • Deny: address: Specif: Domain: pattern: "(www.)?facebook.com" port: Any protocol: Specif: Tcp
  • Deny: address: Specif: Domain: pattern: "(www.)?youtube.com" port: Any protocol: Specif: Tcp ```

Integration Test

1. Prepare the socks and http server

$ docker-compose build $ docker-compose up -d

1. Run ignored test

$ cargo test --verbose -- --nocapture --ignored