Pass C# Securestring Object to PowerShell

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• Monday, December 10, 2012 3:27 PM

   

   
  

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  You could start here: http://technet.microsoft.com/en-us/library/hh849814.aspx

  YOur code is not PowerSHell script in htat you are trying to create a customhost in C#.  Use PowerShell command line to test your methodology.

  $SecureString = Read-Host -AsSecureString
  $StandardString = ConvertFrom-SecureString  $SecureString

  ---

  ¯\_(ツ)_/¯

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• Monday, December 10, 2012 3:54 PM

   

   
  

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  It just thought that maybeyou were asking how to "Decrypt" a secure string.  If sio here is a method that works locally.

   [System.Runtime.InteropServices.marshal]::PtrToStringAuto([System.Runtime.InteropServices.marshal]::SecureStringToBSTR($securestring))

  You may have to release memeory:

  $ptr=[System.Runtime.InteropServices.marshal]::SecureStringToGlobalAllocUnicode($ss)
  [System.Runtime.InteropServices.marshal]::PtrToStringAuto($ptr)
  [System.Runtime.InteropServices.marshal]::FreeHGlobal($ptr)

  $ptr=[System.Runtime.InteropServices.Marshal]::SecureStringToCoTaskMemUnicode($ss)
  [System.Runtime.InteropServices.Marshal]::PtrToStringUni($ptr)
  [System.Runtime.InteropServices.Marshal]::ZeroFreeCoTaskMemUnicode($ptr)

  The method you would use would depend on the way in which you are passing the SecureString; in or out of process.

  ---

  ¯\_(ツ)_/¯

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• Tuesday, December 11, 2012 8:40 AM

   

   
  

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  It just thought that maybeyou were asking how to "Decrypt" a secure string. 

  no I have C# Code and there I have a Securestring object. Now I want to pass it to Powershell to use it for creating a Session ( Credential). I think ConvertTo or From Secure String is not the right way, becaue it is already a Securestring object ( in C#)
  
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• Tuesday, December 11, 2012 12:58 PM

   

   
  

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  It just thought that maybeyou were asking how to "Decrypt" a secure string. 

  no I have C# Code and there I have a Securestring object. Now I want to pass it to Powershell to use it for creating a Session ( Credential). I think ConvertTo or From Secure String is not the right way, becaue it is already a Securestring object ( in C#)
  

  
  We don't  understand.  Just pass the object.  If you need help with this then you need to post in the C# forum for assistance with using C# and Net framework classes.

  ---

  ¯\_(ツ)_/¯

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• Tuesday, December 11, 2012 1:32 PM

   

   
  

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  It just thought that maybeyou were asking how to "Decrypt" a secure string. 

  no I have C# Code and there I have a Securestring object. Now I want to pass it to Powershell to use it for creating a Session ( Credential). I think ConvertTo or From Secure String is not the right way, becaue it is already a Securestring object ( in C#)
  

  I am going to give this one more try.

  You have a SecureString object and want to pass it.  You can pass it in-process as an object.  You can pass it out-of-process as a global object.  You can convert it to a string and pass it as part of text in a file or a script.  When passed as a string it can be converted back into a SecureString object using ConvertTo-SecureString.

  This allows you to use the encrypted string in all possible ways.  ConvertTo and ConvertFrom are a pair of CmdLets.  They work together.

  ---

  ¯\_(ツ)_/¯

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• Friday, December 14, 2012 9:16 AM

   

   
  

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  i think the problem isn't clear. what i said in the start post wasn't correct
  

  here is the whole code:

  PSCredential cred = new PSCredential( "bla", "blaa");
  //#--- here some converting stuff c# cred object to powershell $cred variable ---- //
                  powershell.AddScript(@"$s = New-PSSession -ComputerName '" + serverName + "' -Credential $cred");
                  powershell.AddScript(@"$a = Invoke-Command -Session $s -ScriptBlock {" + cmdlet + "}");
                  powershell.AddScript(@"Remove-PSSession -Session $s");
                  powershell.AddScript(@"echo $a");

  
  

  maybe now it is clear what i want to do.

  my first idea was this:

  powershell.AddCommand("New-PSSession").AddParameter("ComputerName", serverName).AddParameter("Credential", cred);

  this is working. it creates a new session with the given PSCredential object from c#.

  The problem for this way is, that i have to use the session object in the rest of the code to invoke some commands. But I don't know how to rewrite the rest of the code, because I haven't the Pssesion in a variable for using.
  

  Any ideas?

  
  
  

  • Edited by Daniel R, Friday, December 14, 2012 9:16 AM
  • Edited by Daniel R, Friday, December 14, 2012 9:17 AM
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• Friday, December 14, 2012 9:52 AM

   

   
  

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  I found the answer myself:

  powershell.AddCommand("Set-Variable");
  powershell.AddParameter("Name", "cred");
  powershell.AddParameter("Value", Credential);
  
  powershell.AddScript(@"$s = New-PSSession -ComputerName '" + serverName + "' -Credential $cred");
  powershell.AddScript(@"$a = Invoke-Command -Session $s -ScriptBlock {" + cmdlet + "}");
  powershell.AddScript(@"Remove-PSSession -Session $s");
  powershell.AddScript(@"echo $a");

  
  Where Credential is the c# PSCredential object
  

  • Marked As Answer by Daniel R, Friday, December 14, 2012 9:52 AM
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