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SOCKS4，SOCKS5

SOCKS4

Standard SOCKS4 proxy service, also compatible with SOCKS4A protocol.

gost -L socks4://:1080

services:
- name: service-0
  addr: :1080
  handler:
    type: socks4
  listener:
    type: tcp

BIND Method

SOCKS4(A) currently only supports the CONNECT method.

SOCKS5

GOST fully implements all the functions of the SOCKS5 protocol, including three commands (CONNECT, BIND and UDP ASSOCIATE) in RFC1928 and the username/password authentication in RFC1929.

Standard SOCKS5 Proxy Service

gost -L socks5://user:pass@:1080

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    auth:
      username: user
      password: pass
  listener:
    type: tcp

BIND

The BIND function is disabled by default on the server, but can be enabled through bind option.

gost -L socks5://user:pass@:1080?bind=true

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    auth:
      username: user
      password: pass
    metadata:
      bind: true
  listener:
    type: tcp

UDP ASSOCIATE

The UDP relay feature is disabled by default on the server side, and can be enabled through udp option.

Server

gost -L "socks5://:1080?udp=true&udpBufferSize=4096"

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    metadata:
      udp: true
      udpBufferSize: 4096
  listener:
    type: tcp
udp (bool, default=false)
Enable UDP relay function, which is disabled by default.
udpBufferSize (int, default=4096)
UDP buffer size. The minimum value is: maximum UDP packet size + 10, otherwise data transfer will fail.

Client

gost -L udp://:1053/:53 -F "socks5://:1080?relay=udp&udpBufferSize=4096"

services:
- name: service-0
  addr: :1053
  handler:
    type: udp
    chain: chain-0
  listener:
    type: udp
  forwarder:
    nodes:
    - name: target-0
      addr: :53
chains:
- name: chain-0
  hops:
  - name: hop-0
    nodes:
    - name: node-0
      addr: :1080
      connector:
        type: socks5
        metadata:
          relay: udp
          udpBufferSize: 4096
      dialer:
        type: tcp
relay (bool, default=false)
Use standard UDP relay method to transmit data, UDP-TUN (UDP-Over-TCP tunnel) method is used by default.
udpBufferSize (int, default=4096)
UDP buffer size. The minimum value is: maximum UDP packet size + 10, otherwise data transfer will fail.

iperf Test

You can use iperf3 to test the UDP relay function.

Start iperf3 service:

iperf3 -s

Start the standard SOCKS5 service (you can also use other SOCKS5 services that support UDP relay):

gost -L "socks5://:1080?notls=true&udp=true&udpBufferSize=65535"

Start port forwarding:

gost -L "tcp://:15201/:5201" -L "udp://:15201/:5201?keepalive=true&readBufferSize=65535" -F "socks5://:1080?relay=udp&udpBufferSize=65535"

Execute perf3 UDP test:

iperf3 -c 127.0.0.1 -p 15201 -u

Extended functions

GOST adds some extended functions based on the standard SOCKS5 protocol.

Negotiated Encryption

GOST supports the 0x00 (NO AUTHENTICATION REQUIRED) and 0x02 (USERNAME/PASSWORD) methods of the standard SOCKS5 protocol, and expands two methods on this basis: TLS (0x80) and TLS-AUTH (0x82) for data encryption.

If both the client and the server use GOST, data transmission will be encrypted by default (negotiation method 0x80 or 0x82), otherwise standard SOCKS5 communication is used (0x00 or 0x02 method). The encryption negotiation function can be turned off on either side through notls option.

gost -L socks5://user:pass@:1080?notls=true

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    auth:
      username: user
      password: pass
    metadata:
      notls: true
  listener:
    type: tcp

MBIND (Multiplex BIND)

GOST extends the BIND method and adds a Multiplex-BIND method (0xF2) that supports multiplexing. Multiplexing is based on the xtaci/smux. This extension is mainly used for TCP remote port forwarding.

Server

gost -L socks5://:1080?bind=true

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    metadata:
      bind: true
  listener:
    type: tcp

Client

gost -L rtcp://:2222/:22 -F socks5://:1080

services:
- name: service-0
  addr: :2222
  handler:
    type: rtcp
  listener:
    type: rtcp
    chain: chain-0
  forwarder:
    nodes:
    - name: target-0
      addr: :22
chains:
- name: chain-0
  hops:
  - name: hop-0
    nodes:
    - name: node-0
      addr: :1080
      connector:
        type: socks5
      dialer:
        type: tcp

UDP-TUN (UDP-Over-TCP Tunnel)

GOST extends the UDP relay method and adds the UDP-Over-TCP method (0xF3). This extension is mainly used for UDP port forwarding.

Server

gost -L socks5://:1080?udp=true

services:
- name: service-0
  addr: :1080
  handler:
    type: socks5
    metadata:
      udp: true
  listener:
    type: tcp

Client

gost -L udp://:10053/:53 -F socks5://:1080

services:
- name: service-0
  addr: :10053
  handler:
    type: udp
  listener:
    type: udp
    chain: chain-0
  forwarder:
    nodes:
    - name: target-0
      addr: :53
chains:
- name: chain-0
  hops:
  - name: hop-0
    nodes:
    - name: node-0
      addr: :1080
      connector:
        type: socks5
      dialer:
        type: tcp

Data Channel

SOCKS proxy can be used in combination with various data channels.

SOCKS Over TLS

gost -L socks4+tls://:8443

gost -L socks5+tls://:8443?notls=true

services:
- name: service-0
  addr: :8443
  handler:
    type: socks5
    # type: socks4
    metadata:
      notls: true
  listener:
    type: tls

Double Encryption

In order to avoid double encryption, the encryption negotiation function of SOCKS5 is turned off (notls=true).

SOCKS Over Websocket

gost -L socks5+ws://:8080

gost -L socks5+wss://:8080

services:
- name: service-0
  addr: :8080
  handler:
    type: socks5
    # type: socks4
  listener:
    type: ws
    # type: wss

SOCKS Over KCP

gost -L socks5+kcp://:8080

services:
- name: service-0
  addr: :8080
  handler:
    type: socks5
    # type: socks4
  listener:
    type: kcp

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