Functions/Revoke-ComPermission.ps1
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# Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Revoke-CComPermission { <# .SYNOPSIS Revokes COM Access or Launch and Activation permissions. .DESCRIPTION Calling this function is equivalent to opening Component Services (dcomcnfg), right-clicking `My Computer` under Component Services > Computers, choosing `Properties`, going to the `COM Security` tab, and removing an identity from the permissions window that opens after clicking the `Edit Limits...` or `Edit Default...` buttons under `Access Permissions` or `Launch and Activation Permissions` section, .LINK Get-CComPermission .LINK Grant-CComPermission .LINK Revoke-CComPermission .EXAMPLE Revoke-CComPermission -Access -Identity 'Users' -Default Removes all default security COM access permissions for the local `Users` group. .EXAMPLE Revoke-CComPermission -LaunchAndActivation -Identity 'Users' -Limits Removes all security limit COM access permissions for the local `Users` group. #> [CmdletBinding()] param( [Parameter(Mandatory=$true)] [string] $Identity, [Parameter(Mandatory=$true,ParameterSetName='DefaultAccessPermission')] [Parameter(Mandatory=$true,ParameterSetName='MachineAccessRestriction')] [Switch] # Revokes Access Permissions. $Access, [Parameter(Mandatory=$true,ParameterSetName='DefaultLaunchPermission')] [Parameter(Mandatory=$true,ParameterSetName='MachineLaunchRestriction')] [Switch] # Revokes Launch and Activation Permissions. $LaunchAndActivation, [Parameter(Mandatory=$true,ParameterSetName='DefaultAccessPermission')] [Parameter(Mandatory=$true,ParameterSetName='DefaultLaunchPermission')] [Switch] # Revokes default security permissions. $Default, [Parameter(Mandatory=$true,ParameterSetName='MachineAccessRestriction')] [Parameter(Mandatory=$true,ParameterSetName='MachineLaunchRestriction')] [Switch] # Revokes security limits permissions. $Limits ) Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState $comArgs = @{ } if( $pscmdlet.ParameterSetName -like 'Default*' ) { $typeDesc = 'default security permissions' $comArgs.Default = $true } else { $typeDesc = 'security limits' $comArgs.Limits = $true } if( $pscmdlet.ParameterSetName -like '*Access*' ) { $permissionsDesc = 'Access' $comArgs.Access = $true } else { $permissionsDesc = 'Launch and Activiation' $comArgs.LaunchAndActivation = $true } $account = Resolve-CIdentity -Name $Identity if( -not $account ) { return } Write-Verbose ("Revoking {0}'s COM {1} {2}." -f $Identity,$permissionsDesc,$typeDesc) $currentSD = Get-CComSecurityDescriptor @comArgs $newSd = ([wmiclass]'win32_securitydescriptor').CreateInstance() $newSd.ControlFlags = $currentSD.ControlFlags $newSd.Group = $currentSD.Group $newSd.Owner = $currentSD.Owner # Remove DACL for this user, if it exists $newSd.DACL = $currentSD.DACL | Where-Object { $_.Trustee.SIDString -ne $account.Sid.Value } | ForEach-Object { $_.PsObject.BaseObject } $converter = New-Object Management.ManagementClass 'Win32_SecurityDescriptorHelper' $sdBytes = $converter.Win32SDToBinarySD( $newSd ) $regValueName = $pscmdlet.ParameterSetName Set-CRegistryKeyValue -Path $ComRegKeyPath -Name $regValueName -Binary $sdBytes.BinarySD -Quiet } Set-Alias -Name 'Revoke-ComPermissions' -Value 'Revoke-CComPermission' |