C# Signature:
[DllImport("advapi32.dll", SetLastError=true)]
static extern bool IsValidSid([MarshalAs(UnmanagedType.LPArray)] byte[] pSid);
VB Signature:
Declare Function IsValidSid Lib "advapi32.dll" (TODO) As TODO
User-Defined Types:
None.
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
class Program {
const int NO_ERROR = 0;
const int ERROR_INSUFFICIENT_BUFFER = 122;
const int ERROR_INVALID_FLAGS = 1004; // On Windows Server 2003 this error is/can be returned, but processing can still continue
enum SID_NAME_USE {
SidTypeUser = 1,
SidTypeGroup,
SidTypeDomain,
SidTypeAlias,
SidTypeWellKnownGroup,
SidTypeDeletedAccount,
SidTypeInvalid,
SidTypeUnknown,
SidTypeComputer
}
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool LookupAccountName(
string lpSystemName,
string lpAccountName,
[MarshalAs(UnmanagedType.LPArray)] byte[] Sid,
ref uint cbSid,
StringBuilder ReferencedDomainName,
ref uint cchReferencedDomainName,
out SID_NAME_USE peUse);
[DllImport("advapi32", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool ConvertSidToStringSid(
[MarshalAs(UnmanagedType.LPArray)] byte[] pSID,
out IntPtr ptrSid);
[DllImport("kernel32.dll")]
static extern IntPtr LocalFree(IntPtr hMem);
[DllImport("advapi32.dll", SetLastError = true)]
static extern bool IsValidSid([MarshalAs(UnmanagedType.LPArray)] byte[] pSid);
static void Main(string[] args) {
string accountName = "user1";
byte [] Sid = null;
uint cbSid = 0;
StringBuilder referencedDomainName = new StringBuilder();
uint cchReferencedDomainName = (uint)referencedDomainName.Capacity;
SID_NAME_USE sidUse;
int err = NO_ERROR;
if (!LookupAccountName(null,accountName,Sid,ref cbSid,referencedDomainName,ref cchReferencedDomainName,out sidUse))
{
err = Marshal.GetLastWin32Error();
if (err == ERROR_INSUFFICIENT_BUFFER || err == ERROR_INVALID_FLAGS)
{
Sid = new byte[cbSid];
referencedDomainName.EnsureCapacity((int)cchReferencedDomainName);
err = NO_ERROR;
if (!LookupAccountName(null,accountName,Sid,ref cbSid,referencedDomainName,ref cchReferencedDomainName,out sidUse))
err = Marshal.GetLastWin32Error();
}
}
else
{
// Consider throwing an exception since no result was found
}
if (err == 0)
{
if (IsValidSid(Sid)) {
Console.WriteLine("SID is a valid SID..");
} else {
Console.WriteLine("SID is an unvalid SID..");
}
IntPtr ptrSid;
if (!ConvertSidToStringSid(Sid,out ptrSid))
{
err = Marshal.GetLastWin32Error();
Console.WriteLine(@"Could not convert sid to string. Error : {0}",err);
}
else
{
string sidString = Marshal.PtrToStringAuto(ptrSid);
LocalFree(ptrSid);
Console.WriteLine(@"Found sid {0} : {1}",sidUse,sidString);
}
}
else
Console.WriteLine(@"Error : {0}",err);
}
}
