Eu tenho que adicionar um caminho de exclusões à chave de registro do Windows Defender. Estou ciente de que existem cmdlets fornecidos pelo Windows Defender para usá-los diretamente para esses fins. Mas infelizmente, no Windows 7 e Powershell v2, eles não estão disponíveis. Então, eu estou tentando construir um script que irá inserir manualmente o valor para a chave do registro. Pesquisando on-line, eu coloquei um script que irá primeiro alterar o proprietário para Administradores, em seguida, adicione o valor e, finalmente, defina o proprietário para o proprietário inicial novamente. Meu código é dado abaixo:
Codifique para ativar o privilégio necessário:
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, $Disable)
}
A parte do código em que eu perco as alterações:
function getRegKeyOwner([string]$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 = "SOFTWARE\Microsoft\Windows"
return getRegKeyOwner -keyPath $windowsKey
}
enable-privilege SeTakeOwnershipPrivilege
$exclussionsPathsKey="SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths"
$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
Mas até a parte de configuração de valor, tudo funciona bem. Somente quando tento definir o proprietário original novamente, recebo a seguinte exceção. Esta é a minha primeira vez roteirizando com o Powershell. E sou totalmente incapaz de entender / resolver o problema.
True
original Owner to the key "SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" is: "NT AUTHORITY\SYSTEM"
Changing owner of Registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths to "Administrators"
giving full access to Administrators for key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
Changing owner of Registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths to "NT AUTHORITY\SYSTEM"
System.Management.Automation.MethodInvocationException: Exception calling "SetAccessControl" with "1" argument(s): "The security identifier is not allowed to
be the owner of this object." ---> System.InvalidOperationException: The security identifier is not allowed to be the owner of this object.
at System.Security.AccessControl.NativeObjectSecurity.Persist(String name, SafeHandle handle, AccessControlSections includeSections, Object exceptionContex
t)
at System.Security.AccessControl.NativeObjectSecurity.Persist(SafeHandle handle, AccessControlSections includeSections, Object exceptionContext)
at System.Security.AccessControl.NativeObjectSecurity.Persist(SafeHandle handle, AccessControlSections includeSections)
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[] arguments)
at System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target, Object[] arguments, MethodInformation methodInformation, Object[] origin
alArguments)
--- End of inner exception stack trace ---
at System.Management.Automation.DotNetAdapter.AuxiliaryMethodInvoke(Object target, Object[] arguments, MethodInformation methodInformation, Object[] origin
alArguments)
at System.Management.Automation.ParserOps.CallMethod(Token token, Object target, String methodName, Object[] paramArray, Boolean callStatic, Object valueTo
Set)
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, ExecutionC
ontext context)
Finalmente, encontrei o que estava faltando no script. O usuário Administrador precisava de privilégio extra para restaurar o privilégio. Apenas uma chamada simples para a função enable-privilege SeRestorePrivilege antes de definir o proprietário original de volta, fornece ao processo atual a permissão necessária.