I wasted much time trying to find easy way how in C# .NET get SID by user name and back, w/o writing C++ dll. I already spend two days once for such dll, but I lost it or something. However, I spent two hours in google groups and web search, untill I found so
nice article.
Sections import Win32 functions to C#, and two functions.
Import section
private static extern bool LookupAccountSid(
[In,MarshalAs(UnmanagedType.LPTStr)] string systemName,
IntPtr sid,
[Out,MarshalAs(UnmanagedType.LPTStr)] StringBuilder name,
ref int cbName,
StringBuilder referencedDomainName,
ref int cbReferencedDomainName,
out int use );
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern bool LookupAccountName(
[In,MarshalAs(UnmanagedType.LPTStr)] string systemName,
[In,MarshalAs(UnmanagedType.LPTStr)] string accountName,
IntPtr sid,
ref int cbSid,
StringBuilder referencedDomainName,
ref int cbReferencedDomainName,
out int use);
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
internal static extern bool ConvertSidToStringSid(
IntPtr sid,
[In,Out,MarshalAs(UnmanagedType.LPTStr)] ref string pStringSid);
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
internal static extern bool ConvertStringSidToSid(
[In, MarshalAs(UnmanagedType.LPTStr)] string pStringSid,
ref IntPtr sid);
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public static string GetSid(string name)
{
IntPtr _sid = IntPtr.Zero; //pointer to binary form of SID string.
int _sidLength = 0; //size of SID buffer.
int _domainLength = 0; //size of domain name buffer.
int _use; //type of object.
//stringBuilder for domain name.
StringBuilder _domain = new StringBuilder();
int _error = 0;
string _sidString = "";
//first call of the function only returns the size
//of buffers (SID, domain name)
LookupAccountName(null, name, _sid, ref _sidLength, _domain,
ref _domainLength, out _use);
_error = Marshal.GetLastWin32Error();
//error 122 (The data area passed to a system call is too small)
// normal behaviour.
if (_error != 122)
{
throw(new Exception(new Win32Exception(_error).Message));
}
else
{
//allocates memory for domain name
_domain = new StringBuilder(_domainLength);
//allocates memory for SID
_sid = Marshal.AllocHGlobal(_sidLength);
bool _rc = LookupAccountName(null, name, _sid, ref _sidLength, _domain,
ref _domainLength, out _use);
if (_rc == false)
{
_error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(_sid);
throw(new Exception(new Win32Exception(_error).Message));
}
else
{
// converts binary SID into string
_rc = ConvertSidToStringSid(_sid, ref _sidString);
if (_rc == false)
{
_error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(_sid);
throw(new Exception(new Win32Exception(_error).Message));
}
else
{
Marshal.FreeHGlobal(_sid);
return _sidString;
}
}
}
}
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public static string GetName(string sid)
{
IntPtr _sid = IntPtr.Zero; //pointer to binary form of SID string.
int _nameLength = 0; //size of object name buffer
int _domainLength = 0; //size of domain name buffer
int _use; //type of object
StringBuilder _domain = new StringBuilder(); //domain name variable
int _error = 0;
StringBuilder _name = new StringBuilder(); //object name variable
//converts SID string into the binary form
bool _rc0 = ConvertStringSidToSid(sid, ref _sid);
if (_rc0 == false)
{
_error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(_sid);
throw(new Exception(new Win32Exception(_error).Message));
}
//first call of method returns the size of domain name
//and object name buffers
bool _rc = LookupAccountSid(null, _sid, _name, ref _nameLength, _domain,
ref _domainLength, out _use);
_domain = new StringBuilder(_domainLength); //allocates memory for domain name
_name = new StringBuilder(_nameLength); //allocates memory for object name
_rc = LookupAccountSid(null, _sid, _name, ref _nameLength, _domain,
ref _domainLength, out _use);
if (_rc == false)
{
_error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(_sid);
throw(new Exception(new Win32Exception(_error).Message));
}
else
{
Marshal.FreeHGlobal(_sid);
return _domain.ToString() + "\\" + _name.ToString();
}
}
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