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Set-Acl

JuanPablo Jofre|Last Updated: 11/22/2016
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3 Contributors

SYNOPSIS

Changes the security descriptor of a specified item, such as a file or a registry key.

SYNTAX

ByPath (Default)

Set-Acl [-Path] <String[]> [-AclObject] <Object> [[-CentralAccessPolicy] <String>] [-ClearCentralAccessPolicy]
 [-Passthru] [-Filter <String>] [-Include <String[]>] [-Exclude <String[]>] [-WhatIf] [-Confirm]
 [-UseTransaction] [<CommonParameters>]

ByInputObject

Set-Acl [-InputObject] <PSObject> [-AclObject] <Object> [-Passthru] [-Filter <String>] [-Include <String[]>]
 [-Exclude <String[]>] [-WhatIf] [-Confirm] [-UseTransaction] [<CommonParameters>]

ByLiteralPath

Set-Acl -LiteralPath <String[]> [-AclObject] <Object> [[-CentralAccessPolicy] <String>]
 [-ClearCentralAccessPolicy] [-Passthru] [-Filter <String>] [-Include <String[]>] [-Exclude <String[]>]
 [-WhatIf] [-Confirm] [-UseTransaction] [<CommonParameters>]

DESCRIPTION

The Set-Acl cmdlet changes the security descriptor of a specified item, such as a file or a registry key, to match the values in a security descriptor that you supply.

To use Set-Acl, use the Path or InputObject parameter to identify the item whose security descriptor you want to change. Then, use the AclObject or SecurityDescriptor parameters to supply a security descriptor that has the values you want to apply. Set-Acl applies the security descriptor that is supplied. It uses the value of the AclObject parameter as a model and changes the values in the item's security descriptor to match the values in the AclObject parameter.

EXAMPLES

-------------------------- EXAMPLE 1 --------------------------

PS C:\>$DogACL = Get-Acl C:\Dog.txt
PS C:\>Set-Acl -Path C:\Cat.txt -AclObject $DogACL

These commands copy the values from the security descriptor of the Dog.txt file to the security descriptor of the Cat.txt file. When the commands complete, the security descriptors of the Dog.txt and Cat.txt files are identical.

The first command uses the Get-Acl cmdlet to get the security descriptor of the Dog.txt file. The assignment operator (=) stores the security descriptor in the value of the $DogACL variable.

The second command uses Set-Acl to change the values in the ACL of Cat.txt to the values in $DogACL.

The value of the Path parameter is the path to the Cat.txt file. The value of the AclObject parameter is the model ACL, in this case, the ACL of Dog.txt as saved in the $DogACL variable.

-------------------------- EXAMPLE 2 --------------------------

PS C:\>Get-Acl C:\Dog.txt | Set-Acl -Path C:\Cat.txt

This command is almost the same as the command in the previous example, except that it uses a pipeline operator to send the security descriptor from a Get-Aclcommand to a Set-Acl command.

The first command uses the Get-Acl cmdlet to get the security descriptor of the Dog.txt file. The pipeline operator (|) passes an object that represents the Dog.txt security descriptor to the Set-Acl cmdlet.

The second command uses Set-Acl to apply the security descriptor of Dog.txt to Cat.txt. When the command completes, the ACLs of the Dog.txt and Cat.txt files are identical.

-------------------------- EXAMPLE 3 --------------------------

PS C:\>$NewAcl = Get-Acl File0.txt
PS C:\>Get-ChildItem c:\temp -Recurse -Include *.txt -Force | Set-Acl -AclObject $NewAcl

These commands apply the security descriptors in the File0.txt file to all text files in the C:\Temp directory and all of its subdirectories.

The first command gets the security descriptor of the File0.txt file in the current directory and uses the assignment operator (=) to store it in the $NewACL variable.

The first command in the pipeline uses the Get-ChildItem cmdlet to get all of the text files in the C:\Temp directory. The Recurse parameter extends the command to all subdirectories of C:\temp. The Include parameter limits the files retrieved to those with the ".txt" file name extension. The Force parameter gets hidden files, which would otherwise be excluded. (You cannot use "c:\temp*.txt", because the Recurse parameter works on directories, not on files.)

The pipeline operator (|) sends the objects representing the retrieved files to the Set-Acl cmdlet, which applies the security descriptor in the AclObject parameter to all of the files in the pipeline.

In practice, it is best to use the Whatif parameter with all Set-Acl commands that can affect more than one item. In this case, the second command in the pipeline would be "Set-Acl -AclObject $NewAcl -WhatIf". This command lists the files that would be affected by the command. After reviewing the result, you can run the command again without the Whatif parameter.

PARAMETERS

-AclObject

Specifies an ACL with the desired property values. Set-Acl changes the ACL of item specified by the Path or InputObject parameter to match the values in the specified security object.

You can save the output of a Get-Acl command in a variable and then use the AclObject parameter to pass the variable, or type a Get-Acl command.

Type: Object
Parameter Sets: (All)
Aliases: 

Required: True
Position: 2
Default value: None
Accept pipeline input: True (ByValue)
Accept wildcard characters: False

-Exclude

Omits the specified items. The value of this parameter qualifies the Path parameter. Enter a path element or pattern, such as "*.txt". Wildcards are permitted.

Type: String[]
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: True

-Filter

Specifies a filter in the provider's format or language. The value of this parameter qualifies the Path parameter. The syntax of the filter, including the use of wildcards, depends on the provider. Filters are more efficient than other parameters, because the provider applies them when retrieving the objects, rather than having Windows PowerShell filter the objects after they are retrieved.

Type: String
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: True

-Include

Changes only the specified items. The value of this parameter qualifies the Path parameter. Enter a path element or pattern, such as "*.txt". Wildcards are permitted.

Type: String[]
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: True

-Passthru

Returns an object that represents the security descriptor that was changed. By default, this cmdlet does not generate any output.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: 

Required: False
Position: Named
Default value: False
Accept pipeline input: False
Accept wildcard characters: False

-Path

Changes the security descriptor of the specified item. Enter the path to an item, such as a path to a file or registry key. Wildcards are permitted.

If you pass a security object to Set-Acl (either by using the AclObject or SecurityDescriptor parameters or by passing a security object from Get-Acl to Set-Acl), and you omit the Path parameter (name and value), Set-Acl uses the path that is included in the security object.

Type: String[]
Parameter Sets: ByPath
Aliases: 

Required: True
Position: 1
Default value: None
Accept pipeline input: True (ByPropertyName)
Accept wildcard characters: True

-CentralAccessPolicy

Establishes or changes the central access policy of the item. Enter the CAP ID or friendly name of a central access policy on the computer.

Beginning in Windows Server® 2012, administrators can use Active Directory and Group Policy to set central access policies for users and groups. For more information, see "Central Access Policies" at http://go.microsoft.com/fwlink/?LinkId=238408http://go.microsoft.com/fwlink/?LinkId=238408.

This parameter is introduced in Windows PowerShell 3.0.

Type: String
Parameter Sets: ByPath, ByLiteralPath
Aliases: 

Required: False
Position: 3
Default value: None
Accept pipeline input: True (ByPropertyName)
Accept wildcard characters: False

-ClearCentralAccessPolicy

Removes the central access policy from the specified item.

Beginning in Windows Server® 2012, administrators can use Active Directory and Group Policy to set central access policies for users and groups. For more information, see "Central Access Policies" at http://go.microsoft.com/fwlink/?LinkId=238408http://go.microsoft.com/fwlink/?LinkId=238408.

This parameter is introduced in Windows PowerShell 3.0.

Type: SwitchParameter
Parameter Sets: ByPath, ByLiteralPath
Aliases: 

Required: False
Position: Named
Default value: False
Accept pipeline input: False
Accept wildcard characters: False

-InputObject

Changes the security descriptor of the specified object. Enter a variable that contains the object or a command that gets the object.

You cannot pipe the object to be changed to Set-Acl. Instead, use the InputObject parameter explicitly in the command.

This parameter is introduced in Windows PowerShell 3.0.

Type: PSObject
Parameter Sets: ByInputObject
Aliases: 

Required: True
Position: 1
Default value: None
Accept pipeline input: True (ByPropertyName)
Accept wildcard characters: False

-LiteralPath

Changes the security descriptor of the specified item. Unlike Path, the value of the LiteralPath parameter is used exactly as it is typed. No characters are interpreted as wildcards. If the path includes escape characters, enclose it in single quotation marks. Single quotation marks tell Windows PowerShell not to interpret any characters as escape sequences.

This parameter is introduced in Windows PowerShell 3.0.

Type: String[]
Parameter Sets: ByLiteralPath
Aliases: PSPath

Required: True
Position: Named
Default value: None
Accept pipeline input: True (ByPropertyName)
Accept wildcard characters: False

-Confirm

Prompts you for confirmation before running the cmdlet.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: cf

Required: False
Position: Named
Default value: False
Accept pipeline input: False
Accept wildcard characters: False

-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Type: SwitchParameter
Parameter Sets: (All)
Aliases: wi

Required: False
Position: Named
Default value: False
Accept pipeline input: False
Accept wildcard characters: False

-UseTransaction

Includes the command in the active transaction. This parameter is valid only when a transaction is in progress. For more information, see Includes the command in the active transaction. This parameter is valid only when a transaction is in progress. For more information, see

Type: SwitchParameter
Parameter Sets: (All)
Aliases: usetx

Required: False
Position: Named
Default value: False
Accept pipeline input: False
Accept wildcard characters: False

CommonParameters

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters (http://go.microsoft.com/fwlink/?LinkID=113216).

INPUTS

System.Security.AccessControl.ObjectSecurity, System.Security.AccessControl.CommonSecurityDescriptor

You can pipe an ACL object or a security descriptor to Set-Acl.

OUTPUTS

System.Security.AccessControl.FileSecurity

By default, Set-Acl does not generate any output. However, if you use the Passthru parameter, it generates a security object. The type of the security object depends on the type of the item.

NOTES

  • The Set-Acl cmdlet is supported by the Windows PowerShell file system and registry providers. As such, you can use it to change the security descriptors of files, directories, and registry keys.

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Get-Acl

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