101 lines
2.7 KiB
PowerShell
101 lines
2.7 KiB
PowerShell
<#
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.SYNOPSIS
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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.
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.DESCRIPTION
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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.
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.PARAMETER Knock_Ports
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Object Array for of the sequence of ports that should be knocked. The array must follow the following pattern.
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Destination, Port, Protocol
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.PARAMETER Delay
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The time to pause between knocks in milliseconds. Defaults to 200 milliseconds.
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.PARAMETER Execute
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Optional command that will be run after the knocking sequence is complete. This is passed directly to a Invoke-Expression command.
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.EXAMPLE
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$Knock_Ports = @(
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("10.1.1.1", 36041, "TCP"),
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("10.1.1.1", 38097, "UDP"),
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("10.1.1.1", 27079, "TCP")
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)
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PortKnock.ps1 -Knock_Ports $Knock_Ports
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.NOTES
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Version: 1.0
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Author: Tyler Hale
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Creation Date: 2021.09.13
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#>
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[CmdletBinding()]
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param (
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[Parameter(Mandatory = $true)]
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[Object[]]
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$Knock_Ports,
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[Parameter(Mandatory = $false)]
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[int]
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$Delay = 200,
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[Parameter(Mandatory = $false)]
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[string]
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$Execute
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)
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$ErrorDetected = $False
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foreach ($Knock in $Knock_Ports) {
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if (!([ipaddress]::TryParse("$($Knock[0])",[ref][ipaddress]::Loopback))) {
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$DNS_Resolve = (Resolve-DnsName $Knock[0])
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$Knock_Destination = $DNS_Resolve.IP4Address
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}
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else {
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$Knock_Destination = $Knock[0]
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}
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$Knock_Port = $Knock[1]
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$Knock_Protocol = $Knock[2]
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try {
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switch ($Knock_Protocol) {
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"TCP" {
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$tcpClient = New-Object System.Net.Sockets.TcpClient
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$tcpClient.BeginConnect($Knock_Destination, $Knock_Port, $null, $null) | Out-Null
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$tcpClient.Close() | Out-Null
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}
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"UDP" {
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$udpClient = New-Object System.Net.Sockets.UdpClient
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$udpClient.Connect($Knock_Destination, $Knock_Port) | Out-Null
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$udpClient.Send([byte[]](0), 1) | Out-Null
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$udpClient.Close() | Out-Null
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}
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default {
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throw "Protocol not found $Knock_Protocol"
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}
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}
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Write-Verbose "Sent $Knock_Protocol packet to $($Knock_Destination):$Knock_Port"
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}
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catch {
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Write-Error $_
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$ErrorDetected = $True
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}
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Start-Sleep -Milliseconds $Delay
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}
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if ($ErrorDetected) {
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Write-Warning "Knock may not have completed successfully"
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}
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else {
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Write-Host "Knock Complete"
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if ($null,"" -ne $Execute) {
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Write-Verbose "Invoking command: $Execute"
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Invoke-Expression -Command $Execute
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}
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}
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