All Signed PowerShell Execution Policy

Purpose:
You receive an error when running a PowerShell script or command from PDQ Deploy or PDQ Inventory similar to:

You cannot run this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at http://go.microsoft.com/fwlink/?LinkID=135170.

FromError Handling Wrapper.ps1 

Resolution:
PDQ.com signs each of our .ps1 files included in the product; this includes the error handling wrapper script that is used when executing PowerShell steps or remote commands, as well as any .ps1 in the package library with a code-signing certificate issued by Digicert. Any .ps1 file that is not provided directly from PDQ.com is not, and cannot be signed with this certificate, this includes any PowerShell directly entered into a PowerShell step, or PowerShell tool. If you organization requires all scripts to be signed you will need to use an install step with a signed .ps1 as the installer file. 

The thumbprint of the cert is:

PDQ Deploy and Inventory version 18.1.28.0 and later:
32AE19914C02705091C58368406293D642F39516

Before version 18.1.28.0:
709DF96FEEDE2CAB2A5FB803BEB599571D18A1D4

CN=PDQ.COM CORPORATION, O=PDQ.COM CORPORATION, L=Salt Lake City, S=Utah, C=US

This certificate is not included in the Trusted Publishers on Windows by default. This is the same code signing certificate with which we sign our applications. When the execution policy of "All-Signed" is set, this will only run scripts when the entire cert chain is installed and trusted. Conversely, installing a signed application does not have this requirement; the installed application must only have a valid signature.

In order to run a PowerShell script from our product when the "All-Signed" execution policy is set, you will need to install the certificate chain. There are a few of ways to accomplish this on your remote machines. First, we must extract the certificate from the product itself. The below PowerShell command will export a .cer file that you can deploy in whichever manner you chose:

Defining the code-signing certificate as a variable

$cert = (Get-AuthenticodeSignature -FilePath "C:\Program Files (x86)\Admin Arsenal\PDQ Deploy\PDQDeployConsole.exe").SignerCertificate

Exporting the certificate to a file

Export-Certificate -Cert $cert -Filepath C:\pdqcert.cer -Type Cert

Now that we have the certificate exported, we have a few options on how to install this certificate:

1. PDQ Deploy - https://support.pdq.com/knowledge-base/1233

2. Group Policy - https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/deployment/distribute-certificates-to-client-computers-by-using-group-policy

3. PowerShell - Importing the certificate created previously to the computer Trusted Publishers store.

Import-Certificate -Filepath C:\pdqcert.cer -CertStoreLocation Cert:\LocalMachine\TrustedPublisher\