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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package elevate
import (
"errors"
"runtime"
"unsafe"
"golang.org/x/sys/windows"
)
func DropAllPrivileges(retainDriverLoading bool) error {
processHandle, err := windows.GetCurrentProcess()
if err != nil {
return err
}
var luid windows.LUID
if retainDriverLoading {
err = windows.LookupPrivilegeValue(nil, windows.StringToUTF16Ptr("SeLoadDriverPrivilege"), &luid)
if err != nil {
return err
}
}
var processToken windows.Token
err = windows.OpenProcessToken(processHandle, windows.TOKEN_READ|windows.TOKEN_WRITE, &processToken)
if err != nil {
return err
}
defer processToken.Close()
var bufferSizeRequired uint32
windows.GetTokenInformation(processToken, windows.TokenPrivileges, nil, 0, &bufferSizeRequired)
if bufferSizeRequired == 0 || bufferSizeRequired < uint32(unsafe.Sizeof(windows.Tokenprivileges{}.PrivilegeCount)) {
return errors.New("GetTokenInformation failed to provide a buffer size")
}
buffer := make([]byte, bufferSizeRequired)
var bytesWritten uint32
err = windows.GetTokenInformation(processToken, windows.TokenPrivileges, &buffer[0], uint32(len(buffer)), &bytesWritten)
if err != nil {
return err
}
if bytesWritten != bufferSizeRequired {
return errors.New("GetTokenInformation returned incomplete data")
}
tokenPrivileges := (*windows.Tokenprivileges)(unsafe.Pointer(&buffer[0]))
for i := uint32(0); i < tokenPrivileges.PrivilegeCount; i++ {
item := (*windows.LUIDAndAttributes)(unsafe.Pointer(uintptr(unsafe.Pointer(&tokenPrivileges.Privileges[0])) + unsafe.Sizeof(tokenPrivileges.Privileges[0])*uintptr(i)))
if retainDriverLoading && item.Luid == luid {
continue
}
item.Attributes = windows.SE_PRIVILEGE_REMOVED
}
err = windows.AdjustTokenPrivileges(processToken, false, tokenPrivileges, 0, nil, nil)
runtime.KeepAlive(buffer)
return err
}
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