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Wednesday, August 2, 2023

Powershell JEA

Just Enough Admin (JEA)

High privilege access to machines via PowerShell is a security risk. JEA allows access to only the commands and components of Powershell needed to perform a task and no more.

It accomplishes this through the combination of a role capability file and a session configuration file.

Role Capability

The role capability file determines WHAT can be done. It is created using the command:
New-PSRoleCapabilityFile -Path .\MyFirstJEARole.psrc

Session Configuration

The Session Configuration file determines WHO can perform the role. It is created using the command:
New-PSSessionConfigurationFile -SessionType RestrictedRemoteServer -Path .\MyJEAEndpoint.pssc
Once the session configuration file has been created and edited, it can be tested with:
Test-PSSessionConfigurationFile
Finally the configuration file can be registered using:
Register-PSSessionConfiguration -Path .\MyJEAConfig.pssc -Name 'JEAMaintenance' -Force
Once registered a user with the specified role can access PowerShell on the JEA Endpoint with:
$nonAdminCred = Get-Credential
Enter-PSSession -ComputerName localhost -ConfigurationName JEAMaintenance -Credential $nonAdminCred

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