c# - 我从 C# 成功调用了 advapi32 的 LsaEnumerateAccountRights()。现在如何解码它返回的 LSA_UNICODE_STRING 数组？

Question

它是一个指向 LSA_UNICODE_STRING 数组的指针结构。我找到了一些执行相反操作的代码，即从 C# 字符串创建 LSA_UNICODE_STRING。您可以在下面的帮助代码部分看到这一点。

我所做的包括对 LsaEnumerateAccountRights() 的调用似乎工作得很好。为数组指针和计数返回合理的值。

我不知道如何那些该死的琴弦。请帮忙？漂亮吗？

更新: nobugz 在他下面的回答中的辅助函数几乎是正确的，您只需将长度除以 UnicodeEncoding.CharSize。多亏了他，我现在可以看到数组中的第一个字符串。请参阅下面两个代码部分末尾的更新。

现在，我该怎么做指针运算？

更新 2.5:请参阅功能代码的答案。我丢失了旧的“错误”代码。

Answer 1

找到了!在 this blog post .现在，下面修改后的代码可以完全正常工作。它甚至是 64 位安全的!

主要代码:

IntPtr sid = IntPtr.Zero;
int sidSize = 0;
StringBuilder domainName = new StringBuilder();
int nameSize = 0;
int accountType = 0;

LookupAccountName("\\\\" + tbHost.Text, tbUsername.Text, sid, ref sidSize,
    domainName, ref nameSize, ref accountType);
domainName = new StringBuilder(nameSize);
sid = Marshal.AllocHGlobal(sidSize);

bool result = LookupAccountName("\\\\" + tbHost.Text, tbUsername.Text, sid, ref sidSize,
    domainName, ref nameSize, ref accountType);

myResults.Text += String.Format("LookupAccountName(): Result {0}, SID {1}\n", result, sid);

LSA_UNICODE_STRING systemName = string2LSAUS("\\\\" + tbHost.Text);
IntPtr policyHandle = IntPtr.Zero;
LSA_OBJECT_ATTRIBUTES objAttrs = new LSA_OBJECT_ATTRIBUTES();
uint retVal = LsaOpenPolicy(ref systemName, ref objAttrs,
                    POLICY_LOOKUP_NAMES | POLICY_VIEW_LOCAL_INFORMATION, out policyHandle);

myResults.Text += String.Format("LsaOpenPolicy(): Result {0}, Policy Handle {1}\n", retVal, policyHandle);

IntPtr rightsArray = IntPtr.Zero;
ulong rightsCount = 0;
long lretVal = LsaEnumerateAccountRights(policyHandle, sid, out rightsArray, out rightsCount);
retVal = LsaNtStatusToWinError(lretVal);

if (retVal != 0)
    throw new System.ComponentModel.Win32Exception((int)retVal);

myResults.Text += String.Format("LsaEnumerateAccountRights(): Result {0}, RightsArray {1}, Count {2}\n",
    retVal, rightsArray, rightsCount);

LSA_UNICODE_STRING myLsaus = new LSA_UNICODE_STRING();
for (ulong i = 0; i < rightsCount; i++)
{
    IntPtr itemAddr = new IntPtr(rightsArray.ToInt64() + (long)(i * (ulong) Marshal.SizeOf(myLsaus)));
    myLsaus = (WinNetUtils.LSA_UNICODE_STRING)Marshal.PtrToStructure(itemAddr, myLsaus.GetType());
    string thisRight = WinNetUtils.LSAUS2string(myLsaus);
    NonBlockingPrint(wmiResults, "Right #{0}: {1}\n", i+1, thisRight);
}
LsaClose(policyHandle);

辅助函数、导入等:

public const int POLICY_VIEW_LOCAL_INFORMATION = 0x1;
public const int POLICY_LOOKUP_NAMES = 0x00000800;

[DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)]
public static extern UInt32 LsaNtStatusToWinError(
    long Status);

[DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, PreserveSig = true)]
public static extern bool ConvertStringSidToSid(
    string StringSid, out IntPtr pSid);

[DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true, PreserveSig = true)]
public static extern bool LookupAccountName( 
    string lpSystemName, string lpAccountName, 
    IntPtr psid, ref int cbsid, 
    StringBuilder domainName, ref int cbdomainLength, 
    ref int use );

[DllImport("advapi32.dll", CharSet = CharSet.Unicode, PreserveSig = true)]
public static extern UInt32 LsaOpenPolicy(
    ref LSA_UNICODE_STRING SystemName,
    ref LSA_OBJECT_ATTRIBUTES ObjectAttributes,
    Int32 DesiredAccess,
    out IntPtr PolicyHandle );

[DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)]
public static extern long LsaEnumerateAccountRights(
    IntPtr PolicyHandle, IntPtr AccountSid,
    out /* LSA_UNICODE_STRING[] */ IntPtr UserRights,
    out ulong CountOfRights); 

[DllImport("advapi32.dll", SetLastError = true, PreserveSig = true)]
public static extern long LsaClose(
            IntPtr PolicyHandle);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct LSA_UNICODE_STRING 
{ 
  public UInt16 Length; 
  public UInt16 MaximumLength; 
  public IntPtr Buffer; 
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct LSA_OBJECT_ATTRIBUTES
{
    public IntPtr RootDirectory;
    public IntPtr SecurityDescriptor;
    public IntPtr SecurityQualityOfService;
    public LSA_UNICODE_STRING ObjectName;
    public UInt32 Attributes;
    public UInt32 Length;
}

public static LSA_UNICODE_STRING string2LSAUS(string myString)
{
    LSA_UNICODE_STRING retStr = new LSA_UNICODE_STRING();
    retStr.Buffer = Marshal.StringToHGlobalUni(myString);
    retStr.Length = (UInt16)(myString.Length * UnicodeEncoding.CharSize);
    retStr.MaximumLength = (UInt16)((myString.Length + 1) * UnicodeEncoding.CharSize);
    return retStr;
}

public static string LSAUS2string(LSA_UNICODE_STRING lsaus)
{
    char[] cvt = new char[lsaus.Length / UnicodeEncoding.CharSize];
    Marshal.Copy(lsaus.Buffer, cvt, 0, lsaus.Length / UnicodeEncoding.CharSize);
    return new string(cvt);
}