Question

我似乎无法通过Powershell设置WMI ACL。调用

Invoke-WmiMethod -Name "SetSecurityDescriptor" -Path "__systemsecurity=@" -ArgumentList $acl.psobject.immediateBaseObject

返回此异常：

Invoke-WmiMethod : Invalid method Parameter(s) 
At line:1 char:17.
+ Invoke-WmiMethod <<<<  -Name "SetSecurityDescriptor" -Path "__systemsecurity=@" -ArgumentList $acl.psobject.immediateBaseObject
    + CategoryInfo          : InvalidOperation: (:) [Invoke-WmiMethod], ManagementException
    + FullyQualifiedErrorId : InvokeWMIManagementException,Microsoft.PowerShell.Commands.InvokeWmiMethod

SetSecurityDescriptor只接受__SecurityDescriptor类型的一个参数，我在$acl中使用的-Arguments对象本身似乎没问题：

PS C:\Windows\system32> $acl | gm


   TypeName: System.Management.ManagementBaseObject#\__SecurityDescriptor

Name             MemberType Definition
----             ---------- ----------
ControlFlags     Property   System.UInt32 ControlFlags {get;set;}
DACL             Property   System.Management.ManagementObject#__ACE[] DACL ...
Group            Property   System.Management.ManagementObject#__ACE Group {...
Owner            Property   System.Management.ManagementObject#__ACE Owner {...
SACL             Property   System.Management.ManagementObject#__ACE[] SACL ...
TIME_CREATED     Property   System.UInt64 TIME_CREATED {get;set;}
__CLASS          Property   System.String __CLASS {get;set;}
__DERIVATION     Property   System.String[] __DERIVATION {get;set;}
__DYNASTY        Property   System.String __DYNASTY {get;set;}
__GENUS          Property   System.Int32 __GENUS {get;set;}
__NAMESPACE      Property   System.String __NAMESPACE {get;set;}
__PATH           Property   System.String __PATH {get;set;}
__PROPERTY_COUNT Property   System.Int32 __PROPERTY_COUNT {get;set;}
__RELPATH        Property   System.String __RELPATH {get;set;}
__SERVER         Property   System.String __SERVER {get;set;}
__SUPERCLASS     Property   System.String __SUPERCLASS {get;set;}

从I can get off the docs开始，我正在调用Parameter Set: path重载，因此参数集似乎不会缺少必需的参数。

我基本上是从this MSDN blog post on the very same topic中删除代码，而使用类似调用的GetSecurityDescriptor会提供所需的结果：

$output = Invoke-WmiMethod -Path "__systemsecurity=@" -Name GetSecurityDescriptor

SetSecurityDescriptor不断向我抛出异常。我如何让它运作？

上下文中的代码，供参考：

# connect to SystemSecurity
$invokeparams = @{Path="__systemsecurity=@"}

# get SecurityDescriptor with ACL
$output = Invoke-WmiMethod @invokeparams -Name GetSecurityDescriptor
if ($output.ReturnValue -ne 0) {
     throw "GetSecurityDescriptor failed: $($output.ReturnValue)"
    }

# ACL object reference is in the .Descriptor property 
$acl = $output.Descriptor

$ace = (New-Object System.Management.ManagementClass("win32_Ace")).CreateInstance()

# AccessMask is WBEM_ENABLE, $WBEM_METHOD_EXECUTE, $WBEM_WRITE_PROVIDER, $WBEM_REMOTE_ACCESS
$ace.AccessMask = 1 + 2 + 0x10 + 0x20
# AceFlags are  $OBJECT_INHERIT_ACE_FLAG, $CONTAINER_INHERIT_ACE_FLAG
$ace.AceFlags =  0x01 + 0x2
# AceType is ACCESS_ALLOWED_ACE_TYPE
$ace.AceType = 0x1 

# get user SID
$getparams = @{Class="Win32_Account";Filter="Domain='MYDOMAIN' and Name='SERVER$'"}
$win32account = Get-WmiObject @getparams
# and build a new Trustee object
$trustee = (New-Object System.Management.ManagementClass("win32_Trustee")).CreateInstance()
$trustee.SidString = $win32account.Sid
$ace.Trustee = $trustee    

# Add ACE to ACL
$acl.DACL += $ace.psobject.immediateBaseObject

# apply new ACL
$setparams = @{Name="SetSecurityDescriptor";ArgumentList=$acl.psobject.immediateBaseObject} + $invokeParams
$output = Invoke-WmiMethod @setparams
if ($output.ReturnValue -ne 0) {
        throw "SetSecurityDescriptor failed: $($output.ReturnValue)"
    }

我也已尝试使用。aforementioned blog post by Steve Lee的评论中建议的.AceFlags属性 - 无济于事。

Answer 1

在你引用的文章中，调用是不同的，这些差异可能很重要 - 参数是一个单独的哈希表，包含所有参数作为名称/值对：

$invokeparams = @{Namespace=$namespace;Path="__systemsecurity=@"}

$setparams = @{Name="SetSecurityDescriptor";ArgumentList=$acl.psobject.immediateBaseObject} + $invokeParams

$output = Invoke-WmiMethod @setparams

Answer 2

我通过改变这一行来实现这一目标

# AceFlags are  $OBJECT_INHERIT_ACE_FLAG, $CONTAINER_INHERIT_ACE_FLAG
$ace.AceFlags =  0x01 + 0x2

到

# AceFlags are  $CONTAINER_INHERIT_ACE_FLAG
$ace.AceFlags = 0x2

我希望我能告诉你为什么这种改变是必要的，但我真的不知道。我还将invokeparams更改为等于@ {Path =＆＃34; __ systemsecurity = @＆＃34 ;; Namespace =＆＃34; root＆＃34;}以便脚本在根级别而不是cimv2级别设置权限。许可似乎是按预期继承的。

通过SetSecurityDescriptor设置WMI ACL

2 个答案: