Group Policy Permission Filters

Description

Permission filters are the conditions you can use for selecting, which GPOs are assigned what permission in the Group Policy Permission Component, when using its Filter property.

Filter conditions can answer any of the following questions:

• Is the GPO defined in the currently loaded configuration?
• Is the GPO linked to this specific OU, or anywhere below it, or to any OU directly below it?
• Is the GPO named like this? (Exact comparison / Wildcard / Regex)

Example Configurations

A filter condition that matches all GPOs defined in configuration:

{
    "Name":  "IsManaged",
    "Managed":  true
}

A filter condition that applies to all GPOs linked to the OU “Tier 0” and all OUs under it:

{
    "Name":  "Tier0Linked",
    "Path":  "OU=Tier 0,%DomainDN%",
    "PathScope":  "SubTree"
}

A filter condition that applies to either the Default Domain Policy or the Default Domain Controllers Policy.

{
    "Name":  "DefaultPolicies",
    "GpName":  "^Default Domain Policy$|Default Domain Controllers Policy",
    "GpNameMode":  "Regex"
}

Properties

Name

Name of the filter rule.

Must only contain letters, numbers and underscore.

Reverse

Reverses the result of the rule. This combined with another condition allows reversing the result. For example, combined with a Path condition, this would make the filter match any GPO NOT linked to that path.

Managed

ParameterSet: Managed

Matches GPOs that are defined by ADMF ($true) or not so ($false).

Path

ParameterSet: Path

This parameter uses name resolution.

Matches GPOs that have been linked to the specified organizational unit (or potentially OUs beneath it).

PathScope

ParameterSet: Path

Defines how the path rule is applied:

Base	Only the specified OU’s linked GPOs are evaluated (default).
OneLevel	Only the OU’s directly beneath the specified OU are evaluated for linked GPOs.
SubTree	All OUs under the specified path are avaluated for linked GPOs.

PathOptional

ParameterSet: Path

Whether the path is optional. By default, when evaluating a path filter, processing of GP permission terminates if the designated path does not exist, as we cannot guarantee a consistent permission-set being applied. With this setting enabled, instead processing silently continues.

Note: Even if this is enabled, a silent log entry will be added anyway for tracking purposes.

GPName

ParameterSet: Name

This parameter uses name resolution.

Name of the GP to filter for. This can be a wildcard or regex match, depending on the -GPNameMode parameter, however by default an exact match is required.

GPNameMode

ParameterSet: Name

How exactly the GPName parameter is applied:

Explicit	An exact name equality is required (default)
Wildcard	Supports wildcard comparisons (using the -like operator)
Regex	Supports regex matching (using the -match operator)

None of the three options is case sensitive.