将注册表项所有者设置为系统用户

Question

我必须向Windows Defender注册表项添加一个排除路径。我知道Windows Defender提供了cmdlet，可以直接将它们用于这些目的。但不幸的是，在Windows 7和PowerShell v2中，它们不可用。所以我正在尝试构建一个脚本，该脚本将手动输入注册表项的值。通过在线研究，我整理了一个脚本，该脚本将首先将所有者更改为管理员(因为只有SYSTEM，WinDefense和TrustedInstaller用户有权访问此密钥(，然后添加值，最后将所有者设置为初始所有者(在本例中为SYSTEM(。我的代码如下：

用于启用所需权限的代码：

Param([string]$targetPath)
function enable-privilege {
Param(
## The privilege to adjust. This set is taken from
## http://msdn.microsoft.com/en-us/library/bb530716(VS.85).aspx
[ValidateSet(
"SeAssignPrimaryTokenPrivilege", "SeAuditPrivilege", "SeBackupPrivilege",
"SeChangeNotifyPrivilege", "SeCreateGlobalPrivilege", "SeCreatePagefilePrivilege",
"SeCreatePermanentPrivilege", "SeCreateSymbolicLinkPrivilege", "SeCreateTokenPrivilege",
"SeDebugPrivilege", "SeEnableDelegationPrivilege", "SeImpersonatePrivilege", "SeIncreaseBasePriorityPrivilege",
"SeIncreaseQuotaPrivilege", "SeIncreaseWorkingSetPrivilege", "SeLoadDriverPrivilege",
"SeLockMemoryPrivilege", "SeMachineAccountPrivilege", "SeManageVolumePrivilege",
"SeProfileSingleProcessPrivilege", "SeRelabelPrivilege", "SeRemoteShutdownPrivilege",
"SeRestorePrivilege", "SeSecurityPrivilege", "SeShutdownPrivilege", "SeSyncAgentPrivilege",
"SeSystemEnvironmentPrivilege", "SeSystemProfilePrivilege", "SeSystemtimePrivilege",
"SeTakeOwnershipPrivilege", "SeTcbPrivilege", "SeTimeZonePrivilege", "SeTrustedCredManAccessPrivilege",
"SeUndockPrivilege", "SeUnsolicitedInputPrivilege")]
$Privilege,
## The process on which to adjust the privilege. Defaults to the current process.
$ProcessId = $pid,
## Switch to disable the privilege, rather than enable it.
[Switch] $Disable
)
## Taken from P/Invoke.NET with minor adjustments.
$definition = @'
using System;
using System.Runtime.InteropServices;
public class AdjPriv {
[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall,
ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);
[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
internal static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr phtok);
[DllImport("advapi32.dll", SetLastError = true)]
internal static extern bool LookupPrivilegeValue(string host, string name, ref long pluid);
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal struct TokPriv1Luid {
public int Count;
public long Luid;
public int Attr;
}
internal const int SE_PRIVILEGE_ENABLED = 0x00000002;
internal const int SE_PRIVILEGE_DISABLED = 0x00000000;
internal const int TOKEN_QUERY = 0x00000008;
internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
public static bool EnablePrivilege(long processHandle, string privilege, bool disable) {
bool retVal;
TokPriv1Luid tp;
IntPtr hproc = new IntPtr(processHandle);
IntPtr htok = IntPtr.Zero;
retVal = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);
tp.Count = 1;
tp.Luid = 0;
if(disable) {
tp.Attr = SE_PRIVILEGE_DISABLED;
} else {
tp.Attr = SE_PRIVILEGE_ENABLED;
}
retVal = LookupPrivilegeValue(null, privilege, ref tp.Luid);
retVal = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);
return retVal;
}
}
'@
$processHandle = (Get-Process -id $ProcessId).Handle
$type = Add-Type $definition -PassThru
$type[0]::EnablePrivilege($processHandle, $Privilege, $Disable)
}

我执行更改的代码部分：

function getRegKeyOwner([string]$keyPath){
$regRights=[System.Security.AccessControl.RegistryRights]::ReadPermissions
$permCheck=[Microsoft.Win32.RegistryKeyPermissionCheck]::ReadWriteSubTree
$Key = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey($keyPath, $permCheck, $regRights)
$acl = $Key.GetAccessControl([System.Security.AccessControl.AccessControlSections]::Owner)
$owner = $acl.GetOwner([type]::GetType([System.Security.Principal.NTAccount]))
$key.Close()
return $owner
}
function setValueToKey([string]$keyPath, [string]$name, [System.Object]$value, [Microsoft.Win32.RegistryValueKind]$regValueKind){
$regRights=[System.Security.AccessControl.RegistryRights]::SetValue
$permCheck=[Microsoft.Win32.RegistryKeyPermissionCheck]::ReadWriteSubTree
$Key = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey($keyPath, $permCheck, $regRights)
"Setting value with properties [name:$name, value:$value, value type:$regValueKind]"
$Key.SetValue($name, $value, $regValueKind)
$key.Close()
}
function changeRegKeyOwner([string]$keyPath, [System.Security.Principal.NTAccount]$user){
try {
$regRights=[System.Security.AccessControl.RegistryRights]::TakeOwnership
$permCheck=[Microsoft.Win32.RegistryKeyPermissionCheck]::ReadWriteSubTree
$key = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey($keyPath, $permCheck, $regRights)
# You must get a blank acl for the key b/c you do not currently have access
$acl = $key.GetAccessControl([System.Security.AccessControl.AccessControlSections]::None)
if([string]::IsNullOrEmpty($user)){
$user = [System.Security.Principal.NTAccount]"$env:userdomain$env:username"
}
"Changing owner of Registry key: HKEY_LOCAL_MACHINE$keyPath to `"$user`""
$acl.SetOwner($user)
$key.SetAccessControl($acl)
} catch {
$_.Exception.toString()
$key.Close()
return
}
giveFullControlToUser -userName "$user" -key $key
$key.Close()
}
function giveFullControlToUser([String]$userName,[Microsoft.Win32.RegistryKey] $key){
"giving full access to $userName for key $key"
# After you have set owner you need to get the acl with the perms so you can modify it.
$acl = $key.GetAccessControl()
$rule = New-Object System.Security.AccessControl.RegistryAccessRule ($userName, "FullControl", @("ObjectInherit", "ContainerInherit"), "None", "Allow")
$acl.SetAccessRule($rule)
$key.SetAccessControl($acl)
}
function getAdminUser {
$windowsKey = "SOFTWAREMicrosoftWindows"
return getRegKeyOwner -keyPath $windowsKey
}
enable-privilege SeTakeOwnershipPrivilege
$exclussionsPathsKey = "SOFTWAREMicrosoftWindows DefenderExclusionsPaths"
$adminGroupName = gwmi win32_group -filter "LocalAccount = $TRUE And SID = 'S-1-5-32-544'" |
select -expand name
$originalOwner = getRegKeyOwner -keyPath $exclussionsPathsKey
"original Owner to the key `"$exclussionsPathsKey`" is: `"$originalOwner`""
changeRegKeyOwner -keyPath $exclussionsPathsKey -user ([System.Security.Principal.NTAccount]"$adminGroupName")
if (!([string]::IsNullOrEmpty($targetPath))) {
$valueName = $targetPath
$vaue = 0
$regValueKind = [Microsoft.Win32.RegistryValueKind]::DWord
setValueToKey -keyPath $exclussionsPathsKey -name $valueName -value $vaue -regValueKind $regValueKind
}
changeRegKeyOwner -keyPath $exclussionsPathsKey -user $originalOwner

但在值设置部分之前，一切正常。我可以看到注册表项中的值，所有者更改为具有完全权限的"管理员"。只有当我尝试再次设置原始所有者"SYSTEM"时，我才会得到以下异常。这是我第一次使用PowerShell编写脚本。我完全无法理解/解决问题。顺便说一下，如果原始用户是"系统"以外的任何其他用户，它就可以工作。也许我在这里缺少一些必要的特权。

输出：

真 密钥"SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths"的原始所有者是："NT AUTHORITY\SYSTEM" 更改注册表项的所有者：HKEY_LOCAL_MACHINE\软件\Microsoft\Windows Defender\排除项\"管理员"的路径 向管理员授予密钥HKEY_LOCAL_MACHINE\软件\Microsoft\Windows Defender\排除项\路径的完全访问权限 更改注册表项的所有者：HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Path to "NT AUTHORITY\SYSTEM" System.Management.Automation.MethodInvocationException： 使用"1"参数调用"SetAccessControl"的异常："不允许安全标识符成为此对象的所有者。 ---> System.InvalidOperationException：不允许安全标识符成为此对象的所有者。  at System.Security.AccessControl.NativeObjectSecurity.Persist(String name， SafeHandle handle， AccessControlSections includeSection， Object exceptionContext(  at System.Security.AccessControl.NativeObjectSecurity.Persist(SafeHandle handle， AccessControlSections includeSection， Object exceptionContext(  at System.Security.AccessControl.NativeObjectSecurity.Persist(SafeHandle handle， AccessControlSections includeSection(  at System.Security.AccessControl.RegistrySecurity.Persist(SafeRegistryHandle hKey， String keyName(  at Microsoft.Win32.RegistryKey.SetAccessControl(RegistrySecurity registrySecurity(  at SetAccessControl(Object ， Object[] (  at System.Management.Automation.MethodInformation.Invoke(Object target， Object[] 参数(  at System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target， Object[] arguments， MethodInformation methodInformation， Object[] originalArguments(  ---内部异常堆栈跟踪结束---  at System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target， Object[] arguments， MethodInformation methodInformation， Object[] originalArguments(  at System.Management.Automation.ParserOps.CallMethod(Token token， Object target， String methodName， Object[] paramArray， Boolean callStatic， Object valueToSet(  at System.Management.Automation.MethodCallNode.InvokeMethod(Object target， Object[] arguments， Object value(  at System.Management.Automation.MethodCallNode.Execute(Array input， Pipe outputPipe， ExecutionContext context(  at System.Management.Automation.ParseTreeNode.Execute(Array input， Pipe outputPipe， ArrayList&resultList， ExecutionContext context(  at System.Management.Automation.StatementListNode.ExecuteStatement(ParseTreeNode statement， Array input， Pipe outputPipe， ArrayList&resultList， ExecutionContext context(

Answer 1

最后，我找到了脚本中缺少的内容。管理员用户需要额外的权限来恢复权限。只需在设置原始所有者之前对函数enable-privilege SeRestorePrivilege进行简单调用，即可为当前进程提供所需的权限。