Entering password automatically in enter-pssession - powershell

Question

Im currently making a Powershell Script in Powershell ISE that is going to be used for entering all of the servers we're hosting and grabbing all the users from the servers ActiveDirectory. To do that I have to connect to all servers automatically (There are many servers but only 42 that we need to access). Let me explain what I've done so far and what te actual problem is.
So as you know there are many different servers, so we had to read all the server IP:S/Usernames/Passwords from a excel file that a colleague made, and then place them into arrays.
From there, we made a for loop looking like this:
for ($S = 0; $ -le $ServerAdressArray.Length; $S++)
{
if ($ServerAdressArray[$S] -like '192.168.*.10')
{
GetData($S)
}
}
What it does is going through the array filtering out all the local IP-Adresses from the array, if it finds a local ip adress, it runs the GetData function which looks like this at the moment:
function GetData([int]$arg1)
{
Enter-PSsession -ComputerName $ServerAdressArray[$arg1] -Credential $UsernamesArray[$arg1] $PasswordArray[$arg1]
}
What I want it to do is to use the row number it found the local IP-Adress on and then use that number to locate the correct Username and Password to log in with on that specific server.
The problem is, i have to enter the password in powershell for every single server. And i just want to enter it on the same line as Enter-PSSession.
If you want more specific details, let me know. Also, I'm new to this type of scripting so if you cold be as basic as possible in your explanations that would be great :)
Thank you.

Answer 1

The problem here is how you're passing the "Credential" parameter. It should be of type PSCredential.
Assuming you've stored the username and password in clear text in your file you can create a credential object directly:
New-Object PSCredential -ArgumentList #("a", ("p"|ConvertTo-SecureString -AsPlainText -Force))
For your example :
Enter-PSsession -ComputerName $ServerAdressArray[$arg1] -Credential (New-object PSCredential -ArgumentList #($UsernamesArray[$arg1], ($PasswordArray[$arg1]|ConvertTo-secureString -AsPlainText -Force)))
However; if you're interested in returning some data for each server back to the executing host (e.g. for further processing) you wouldn't want to enter the session, you would want to use Invoke-command instead.
E.g.
Invoke-command -ComputerName $ServerAdressArray[$arg1] -Credential (New-object PSCredential -ArgumentList #($UsernamesArray[$arg1], ($PasswordArray[$arg1]|ConvertTo-secureString -AsPlainText -Force))) -Scriptblock $scriptblockToExecute

Answer 2

Hi CmdrTchort/Richard (:P). Thank you for the answer!
All the passwords in the excelfile are encrypted for security reasons. I am currently working on a function that will decrypt the password before using it.
I've looked around a bit more on the internet and i stumbled across this post:
Using PowerShell credentials without being prompted for a password
I tried what Jeroen Landheer said and the function now looks like this:
function GetData(int[$arg1])
{
$secstr = New-Object -TypeName System.Security.Securestring
$PasswordArray[$arg1].ToCharArray() | ForEach-Object {$secstr.AppendChar($_)}
$cred = new-object -typename System.Management.Automation.PSCredential -argumentlist $username, $secstr
$session = new-pssession -computername $ServerAdressArray[$arg1] -credential $UserNameArray[$arg1] $PasswordArray[$arg1]
}
The Prompt is appearing so the password hasn't automatically been filled in and when i close the prompt(s). I get this error:
New-PSSession : A positional parameter cannot be found that accepts argument '(encryptedpassword)'.
At C:\xxxxxxx\xxxxx\xxxxxx\superfile.ps1:109 char:16
+ ... $session = new-pssession -computername $ServerAdressArray[$arg1] -cr ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [New-PSSession], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.NewPSSessionCommand
Do I have to enter some kind of positional parameter or does it now work because its encrypted?