Setting the embedded script in a PowerShell Session

Alexandre Bélisle
Posts: 118

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Hello @everyone

A member of our community recently asked if there were a way to set the Embedded Script of a PowerShell Session programatically.
Before even trying to solve this challenge, he came back up to us with solution;
We thought it would be interesting to share his solution with our beloved community.

So here it goes:

function Get-CompressedByteArray
# This function actually does all the encrytion necessay to populate
{
[CmdletBinding()]
Param
(
[Parameter(Mandatory,ValueFromPipeline,ValueFromPipelineByPropertyName)][byte[]] $byteArray = $(Throw("-byteArray is required"))
)
Process
{
# Write-Verbose "Get-CompressedByteArray"
[System.IO.MemoryStream] $output = New-Object System.IO.MemoryStream
$gzipStream = New-Object System.IO.Compression.DeflateStream $output, ([IO.Compression.CompressionMode]::Compress)
$gzipStream.Write( $byteArray, 0, $byteArray.Length )
$gzipStream.Close()
$output.Close()
$tmp = $output.ToArray()
# Write-Output $tmp
}
}

$InlineScript = '<paste the scripot you want to input in the embedded script section>'

$bytes = [System.Text.Encoding]::ASCII.GetBytes($InlineScript)
$CompressedBytes = Get-CompressedByteArray $bytes

at this point, we get a fully functional compressed string that will be easily set to the EmbeddedScriptCompressed property of a powershell session, such as :
# if applicable, Import the RDM Powershell Module

$s = Get-RDMSession -Name "name of the session you want to set the embedded script into"
$s.PowerShell.EmbeddedScriptCompressed = $CompressedBytes
Set-RDMSession $s

Regards,

Happy Holiday Season!
Although our various support queues will be monitored during the coming holiday season, Devolutions' offices will be closed from December 24th, 2019, to January 1, 2020, inclusively.

Alexandre Bélisle
Posts: 118

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Hello @everyone

Additionally, we can apply this the other way around to read the content of an already set PowerShell Session :

function Get-DecompressedByteArray {

[CmdletBinding()]
Param
(
[Parameter(Mandatory,ValueFromPipeline,ValueFromPipelineByPropertyName)]
[byte[]] $byteArray = $(Throw("-byteArray is required"))
)
Process
{
# Write-Verbose "Get-DecompressedByteArray"
$input = New-Object System.IO.MemoryStream( , $byteArray )
$output = New-Object System.IO.MemoryStream
$gzipStream = New-Object System.IO.Compression.DeflateStream $input, ([IO.Compression.CompressionMode]:ecompress)
$gzipStream.CopyTo( $output )
$gzipStream.Close()
$input.Close()
[byte[]] $byteOutArray = $output.ToArray()
# Write-Output $byteOutArray
}
}

$s = Get-RDMSession -Name "name of the session you want to get the embedded script from"
$DecompressedBytes = Get-DecompressedByteArray ($s.PowerShell.EmbeddedScriptCompressed)

# display the text

Write-Host ( $enc.GetString( $decompressedByteArray ) | Out-String )

Regards,

Happy Holiday Season!
Although our various support queues will be monitored during the coming holiday season, Devolutions' offices will be closed from December 24th, 2019, to January 1, 2020, inclusively.

sredden
Posts: 45

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Very helpful!

For anyone trying to update an XML file from an RDM Session Export (File > Export > Selection: myexport.rdm), you can convert the bytearray from the above Get-CompressedBytes function to base64 and save it in the XML.

ex:
$CompressedBytes = Get-CompressedByteArray -byteArray $Bytes
$XMLNode.PowerShell.EmbeddedScriptCompressed = [string]([Convert]::ToBase64String($CompressedBytes))