![]() TIP: - Some cmdlets that accept a credential parameter do not support ::Empty as they should. The snippet of code below shows what the function would now look like with all these changes. I’ll walk through this later in the post. One is a simple if statement and another option are to use splatting. There are a few other methods for handling this problem. By providing a default empty credential object, you can resolve that error. If you do not provide a credential object to your function, the code will error out when it hits the cmdlet inside your code that requires a credential. Why do this? Well, in your code you might be passing this $Credential object to existing PowerShell cmdlets that use the -Credential parameter. Adding ::Empty as a default value will populate an empty credential object. Lastly, you can do is set a default value for the $Credential parameter. This allows you to pass in a username as a string and have an interactive prompt for the password, which I’ll demonstrate later in the post. If you don’t have proper credential input specified, why execute? If it is, it will stop the function from executing. The first thing you can add is, which checks to see if the value being passed to -Credential is null. The code above would be enough to have a working credential parameter, however there are a few things you can add to make it more robust. In the example below, I’m storing the secure string into a variable called $password and the credential object into a variable $Cred. That syntax looks like this New-Object (“username”, $secpasswd). With the secure string created you’ll need to pass it to the PSCredential method to create the credential object. The reason being, if your PowerShell session is logged, that password would exist in the log. Both the -AsPlainText and -Force parameters are required or you’ll receive error messages saying you shouldn’t pass plain text into a secure string. The syntax for creating a secure string looks like this ConvertTo-SecureString “PlainTextPassword” -AsPlainText -Force. Sounds a lot more complicated than it is, I assure you. ![]() You then have to pass the secure string and user name to the ’s PSCredential method. To do this you’ll have to create a secure string, which contains the password. Most automation tools such as Jenkins, TeamCity, and Octopus Deploy require a non-interactive method. Sometimes, you won’t want an interactive method of creating credential objects as I just demonstrated. $Cred = Get-Credential -UserName domain\user -Message 'Enter Password' $Cred = Get-Credential -Credential domain\user In the example below, I’m storing each credential object to a variable called $Cred. ![]() You can also store the credential object in a variable, which allows you to use the credential several times. The code below demonstrates using the cmdlet. The only difference I’ve noticed is when you use -UserName you’ll also be required to input a message value. To specify the domain name and username ahead of time you can use either the -Credential or -UserName parameters. From there you could enter the domainName\userName or you can call the cmdlet with some optional parameters. You can simply execute Get-Credential, which will result in a username and password prompt. ![]() The first and easiest method is by using the PowerShell cmdlet Get-Credential. There are a few ways that you can generate a credential object. MSDN The objects are then passed to the parameter of a function and used to execute the function as that user account in the credential object. ![]() PSCredential objects represent a set of security credentials, such as a user name and password. I also discuss how to get around common issues when working with legacy cmdlets that don’t support a credential object, but before we get started let’s first talk about PSCredential objects and how to generate them. This blog post walks you through the process of adding such functionality to your PowerShell functions. Assuming your normal account running the PowerShell session doesn’t have that access already. The most common use is to run the function or cmdlet as an elevated user account.įor example, the cmdlet New-ADUser has a -Credential parameter, which you could provide domain admin credentials in order to create an account in a domain. The purpose of the credential parameter is to allow you to run the function and/or cmdlet as a different user, some account other than the one currently running the PowerShell session. But before I do that let’s first talk about why you’d want to add a credential parameter to your functions. In this blog post, I’ll show you how to add credential parameters to PowerShell functions. ![]()
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