如何确定流程的完整性级别？

Question

全部最近，我需要获取流程的完整性级别，并且从MSDN获得了帮助。示例代码如下：

if (GetTokenInformation(hToken, TokenIntegrityLevel, 
     pTIL, dwLengthNeeded, &dwLengthNeeded))
 {
  dwIntegrityLevel = *GetSidSubAuthority(pTIL->Label.Sid, 
    (DWORD)(UCHAR)(*GetSidSubAuthorityCount(pTIL->Label.Sid)-1));

  if (dwIntegrityLevel == SECURITY_MANDATORY_LOW_RID)
  {
   // Low Integrity
   wprintf(L"Low Process");
  }
  else if (dwIntegrityLevel >= SECURITY_MANDATORY_MEDIUM_RID && 
       dwIntegrityLevel < SECURITY_MANDATORY_HIGH_RID)
  {
   // Medium Integrity
   wprintf(L"Medium Process");
  }
  else if (dwIntegrityLevel >= SECURITY_MANDATORY_HIGH_RID)
  {
   // High Integrity
   wprintf(L"High Integrity Process");
  }
  else if (dwIntegrityLevel >= SECURITY_MANDATORY_SYSTEM_RID)
  {
   // System Integrity
   wprintf(L"System Integrity Process");
  }
 }

众所周知，

SECURITY_MANDATORY_LOW_RID == 0x00001000L
SECURITY_MANDATORY_MEDIUM_RID == 0x00002000L
SECURITY_MANDATORY_HIGH_RID == 0x00003000L
SECURITY_MANDATORY_SYSTEM_RID == 0x00004000L.

这是我的问题：如果此示例代码正确，那么如果dwIntegrityLevel为0x00004100L，则进程A具有什么完整性级别？ SECURITY_MANDATORY_HIGH_RID和SECURITY_MANDATORY_SYSTEM_RID？这是否意味着具有SECURITY_MANDATORY_SYSTEM_RID级别的进程也具有SECURITY_MANDATORY_HIGH_RID？

如果示例代码错误，那么确定流程完整性级别的正确方法是什么？

Answer 1

注意WinNT.h中的等效声明：

#define SECURITY_MANDATORY_MEDIUM_PLUS_RID  (SECURITY_MANDATORY_MEDIUM_RID + 0x100)

听起来好像您遇到了SYSTEM_PLUS的进程。

Answer 2

我建议您查看在https://github.com/chromium/chromium/blob/master/base/process/process_info_win.cc上找到的Chrome / Chromium GetCurrentProcessIntegrityLevel实现。这可能是一个值得信赖的参考。