Functions/Set-ServiceAcl.ps1

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
# 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 Set-ServiceAcl
{
    <#
    .SYNOPSIS
    Sets a service's discretionary access control list (i.e. DACL).
     
    .DESCRIPTION
    The existing DACL is replaced with the new DACL. No previous permissions are preserved. That's your job. You're warned!
     
    You probably want `Grant-ServicePermission` or `Revoke-ServicePermission` instead.
     
    .LINK
    Get-ServicePermission
     
    .LINK
    Grant-ServicePermission
     
    .LINK
    Revoke-ServicePermission
     
    .EXAMPLE
    Set-ServiceDacl -Name 'Hyperdrive' -Dacl $dacl
     
    Replaces the DACL on the `Hyperdrive` service. Yikes! Sounds like something the Empire would do, though.
    #>

    [CmdletBinding(SupportsShouldProcess=$true)]
    param(
        [Parameter(Mandatory=$true)]
        [string]
        # The service whose DACL to replace.
        $Name,
        
        [Parameter(Mandatory=$true)]
        [Security.AccessControl.DiscretionaryAcl]
        # The service's new DACL.
        $Dacl
    )
    
    Set-StrictMode -Version 'Latest'

    Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState

    $rawSD = Get-ServiceSecurityDescriptor -Name $Name
    $daclBytes = New-Object byte[] $Dacl.BinaryLength 
    $Dacl.GetBinaryForm($daclBytes, 0);
    $rawSD.DiscretionaryAcl = New-Object Security.AccessControl.RawAcl $daclBytes,0
    $sdBytes = New-Object byte[] $rawSD.BinaryLength   
    $rawSD.GetBinaryForm($sdBytes, 0);
    
    if( $pscmdlet.ShouldProcess( ("{0} service DACL" -f $Name), "set" ) )
    {
        [Carbon.Service.ServiceSecurity]::SetServiceSecurityDescriptor( $Name, $sdBytes )
    }
}