# Invoke-PortKnock

PowerShell script that knocks on a given sets of ports. It can optionally take an execute parameter to run a secondary script after the knocking is complete.

It should be noted that using port knocking is not a security measure alone, it is generally used to minimize detections from random bots on the internet. It is easy to figure out a port knocking sequence so make sure that your systems are using security best practices.

## Requirements

## Variables

|  Variable   | Required | Default | Choices |                                                            Description                                                             |
| ----------- | -------- | ------- | ------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| Knock_Ports | Yes      |         |         | Object Array for of the sequence of ports that should be knocked - The array must follow the following pattern                     |
| Delay       | No       | 200     |         | The time to pause between knocks in milliseconds                                                                                  |
| Execute     | No       |         |         | Optional command that will be run after the knocking sequence is complete. This is passed directly to a Invoke-Expression command |

### Knock_Ports Object

|  Variable   | Required | Default | Choices |              Description               |
| ----------- | -------- | ------- | ------- | -------------------------------------- |
| Destination | Yes      |         |         | Destination for port knock             |
| Port        | Yes      |         |         | Port to be used for port knock         |
| Protocol    | Yes      |         | TCP,UDP | Protocol to be used for the port knock |

## Example

Simple port knock with a delay of 500ms to avoid issues on a high latency connection

```powershell
$Knock_Ports = @(
    ("10.1.1.1", 36041, "TCP"),
    ("10.1.1.1", 38097, "UDP"),
    ("10.1.1.1", 27079, "TCP")
)

.\PortKnock.ps1 -Knock_Ports $Knock_Ports -Delay 500
```

Port knock that initiates a RDP connection to a device after the knocking sequence is complete.

```powershell
$Knock_Ports = @(
    ("10.1.1.1", 36041, "TCP"),
    ("10.1.1.1", 38097, "UDP"),
    ("10.1.1.1", 27079, "TCP")
)

.\PortKnock.ps1 -Knock_Ports $Knock_Ports -Execute "mstsc.exe /v:10.1.1.1:3389 /public"
```

Port knock that initiates a SSH connection to a device after the knocking sequence is complete.

```powershell
$Knock_Ports = @(
    ("10.1.1.1", 36041, "TCP"),
    ("10.1.1.1", 38097, "UDP"),
    ("10.1.1.1", 27079, "TCP")
)

.\PortKnock.ps1 -Knock_Ports $Knock_Ports -Execute "ssh example@10.1.1.1"
```

## License

See LICENSE file for full license information.