如何检查NTAccount对象代表组还是用户？

Question

使用由返回的访问规则时

GetAccessRules(True, True, GetType(System.Security.Principal.NTAccount))

如何判断每个规则中引用的NTAccount对象是用户帐户还是组？

更新：

我能够解决以下问题。请注意，此代码的目的是True如果s NTAccount是一个组，False否则返回，或者在检查过程中发生错误时返回。

有一个更好的方法吗？

Public Function IsGroup(ByVal account As NTAccount) as Boolean  
    Dim samAccountName as string = account.Value  
    Dim accountNameParts() As String = samAccountName.Split("\")  
    If accountNameParts.Count() = 2 Then  
        Dim principalContext As PrincipalContext  
        Try  
            principalContext = New PrincipalContext(ContextType.Domain, accountNameParts(0))  
        Catch  
            Try  
                principalContext = New PrincipalContext(ContextType.Machine, accountNameParts(0))  
            Catch  
                principalContext = Nothing  
            End Try  
        End Try  
        If Not principalContext Is Nothing Then  
            Dim principal As Principal  
            principal = principal.FindByIdentity(principalContext, _samAccountName)  
            If Not principal Is Nothing then   
                return TypeOf principal Is GroupPrincipal  
            End If  
        End If  
    End If  
    Return False  
End Function

另一个更新：

对于大多数服务器\帐户对象来说，上述解决方案都可以，但对于我们拥有的EMC Celerra NAS服务器上的本地组对象，则无法解决。我正在尝试使用NetUserGetInfo / NetLocalGroupGetInfo Win API调用来查看是否可以运行，但是无法使其正常运行。有关更多详细信息，请参见NetUserGetInfo / NetLocalGroupGetInfo返回错误1722。

Answer 1

我遇到了和你一样的问题。经过到处研究后，我终于找到了一个不错的解决方案来解决这个问题：这个想法是使用 WinAPI LookupAccountSid。我已经针对域帐户和本地帐户对此进行了测试。Domain\User、NT Authority\System、MachineName\Administrators 都可以工作。请注意，我没有在那里放置任何异常处理。您可以判断哪种处理方式适合您的场景。要获取异常，您可以使用 System.Runtime.InteropServices.Marshal.GetLastWin32Error()

public enum PrincipalType
{
    User,
    Group
}
public bool TryGetPrincipalType(string domainQualifiedName, out PrincipalType type)
{
        var name = new StringBuilder();
        var cchName = (uint) name.Capacity;
        var referencedDomainName = new StringBuilder();
        var cchReferencedDomainName = (uint) referencedDomainName.Capacity;
        SID_NAME_USE sidType;

        var account = new NTAccount(domainQualifiedName);

        var id = new SecurityIdentifier(account.Translate(typeof (SecurityIdentifier)).Value);
        var sidBuffer = new byte[id.BinaryLength];
        id.GetBinaryForm(sidBuffer, 0);

        if (LookupAccountSid(null, sidBuffer, name, ref cchName, referencedDomainName,
                             ref cchReferencedDomainName, out sidType))
        {
            switch (sidType)
            {
                case SID_NAME_USE.SidTypeGroup:
                case SID_NAME_USE.SidTypeWellKnownGroup:
                case SID_NAME_USE.SidTypeAlias:
                    type = PrincipalType.Group;
                    return true;
                case SID_NAME_USE.SidTypeUser:
                    type = PrincipalType.User;
                    return true;
            }
        }
        type = default(PrincipalType);
        return false;
    }
private enum SID_NAME_USE
{
    SidTypeUser = 1,
    SidTypeGroup,
    SidTypeDomain,
    SidTypeAlias,
    SidTypeWellKnownGroup,
    SidTypeDeletedAccount,
    SidTypeInvalid,
    SidTypeUnknown,
    SidTypeComputer
}
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool LookupAccountSid(
        string lpSystemName,
        [MarshalAs(UnmanagedType.LPArray)] byte[] Sid,
        StringBuilder lpName,
        ref uint cchName,
        StringBuilder ReferencedDomainName,
        ref uint cchReferencedDomainName,
        out SID_NAME_USE peUse);

Answer 2

答案确实是使用 Windows API（NetUserGetInfo和NetLocalGroupGetInfo）。

Class NetApi
    Private Declare Unicode Function NetUserGetInfo Lib "Netapi32.dll" ( _
         ByVal ServerName As String, _
         ByVal UserName As String, _
         ByVal level As Integer, _
         ByRef BufPtr As IntPtr) As Integer

    Private Declare Unicode Function NetLocalGroupGetInfo Lib "Netapi32.dll" ( _
         ByVal ServerName As String, _
         ByVal GroupName As String, _
         ByVal level As Integer, _
         ByRef BufPtr As IntPtr) As Integer

    Declare Unicode Function NetApiBufferFree Lib "netapi32.dll" _
    (ByRef buffer As IntPtr) As Long

    Public Shared Function PrincipalIsGroup(ByVal MachineName As String, ByVal AccountName As String) As String
        If String.IsNullOrEmpty(MachineName) Then
            Throw New ArgumentException("MachineName is Required")
        End If
        If String.IsNullOrEmpty(AccountName) Then
            Throw New ArgumentException("AccountName is Required")
        End If
        Dim returnValue As String = "NotFound"
        Dim bufPtr As IntPtr
        Dim lngReturn As Integer = NetLocalGroupGetInfo("\\" & MachineName, AccountName, 0, bufPtr)
        Call NetApiBufferFree(bufPtr)
        bufPtr = IntPtr.Zero
        If lngReturn = 0 Then
            returnValue = "True"
        Else
            lngReturn = NetUserGetInfo("\\" & MachineName, AccountName, 0, bufPtr)
            Call NetApiBufferFree(bufPtr)
            bufPtr = IntPtr.Zero
            If lngReturn = 0 Then
                returnValue = "False"
            End If
        End If
        Return returnValue
    End Function
End Class