How to get user id guid -- dotnet security

Keith Harris
5/18/2006 3:07:01 PM

Thanks for your reply Joe.
I'm having some trouble figuring out the methods of the secur32 dll. Do you
know of any resources that could help figure out how I can get the guid for
the current logged on user?

Thank You.

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Keith Harris
5/18/2006 4:20:02 PM

Hi Joe,
I found the information I needed to use the secur32 dll but when I try to
convert the username to a unique id, it's always blank. Here's the code I
use:

///////////////////////////////////////////////////////////////////////////////
#region setup call to dll
[Flags]
public enum EXTENDED_NAME_FORMAT
{
NameUnknown = 0,
NameFullyQualifiedDN = 1,
NameSamCompatible = 2,
NameDisplay = 3,
NameUniqueId = 6,
NameCanonical = 7,
NameUserPrincipal = 8,
NameCanonicalEx = 9,
NameServicePrincipal = 10,
NameDnsDomain = 12
}
///////////////////////////////////////////////////////////////////////////////
[DllImport("secur32", CharSet=CharSet.Auto, SetLastError=true)]
static extern bool TranslateName(string lpAccountName,
EXTENDED_NAME_FORMAT AccountNameFormat, EXTENDED_NAME_FORMAT
DesiredNameFormat, System.Text.StringBuilder lpTranslatedName, ref int nSize);
#endregion

///////////////////////////////////////////////////////////////////////////////
string PrintName(string userName, EXTENDED_NAME_FORMAT fromFmt)
{
StringBuilder translatedName = new StringBuilder(256);
int nSize = translatedName.Capacity;
if (!TranslateName(userName, fromFmt,
EXTENDED_NAME_FORMAT.NameUniqueId, translatedName, ref nSize))
return Marshal.GetLastWin32Error().ToString();
else
return translatedName.ToString();
}

///////////////////////////////////////////////////////////////////////////////
protected void Page_Load(object sender, EventArgs e)
{
string username = HttpContext.Current.User.Identity.Name;
Response.Write(PrintName(username,
EXTENDED_NAME_FORMAT.NameDnsDomain));
}

///////////////////////////////////////////////////////////////////////////////

My web site is using Integrated Windows authentication with Digest
authentication selectec and Anonymous access off.

I appreciate any ideas you might have.

Thanks for you help,
-Keith

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Joe Kaplan (MVP - ADSI)
5/19/2006 9:43:57 AM

Your p/invoke looks good to me. I think I'd change it throw a
System.ComponentModel.Win32Exception using the result from GetLastWin32Error
if there is a failure, but I don't think that is crucial.

You might try www.pinvoke.net to see if they've wrapped this API or also
perhaps try the framework.interop newgroup. If I get a chance to play with
later today, I'll try it myself and see what can be made to happen.

Joe K.

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Keith Harris
5/19/2006 3:55:01 PM

I found a much easier way to get the user id is to use the UserProfileManager
to get a UserProfile object which contains the user's id. Here's the code:

UserProfileManager upm = new UserProfileManager(PortalContext.Current);
if (upm != null)
{
UserProfile up = upm.GetUserProfile(HttpContext.Current.User.Identity.Name);
if (up != null)
return up.ID;
}

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Joe Kaplan (MVP - ADSI)
5/19/2006 11:00:56 PM

Great, if that works, then cool. Is that a SharePoint feature, or something
else?

Joe K.

--
Joe Kaplan-MS MVP Directory Services Programming
Co-author of "The .NET Developer's Guide to Directory Services Programming"
http://www.directoryprogramming.net
--
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Keith Harris
5/20/2006 4:32:01 PM

SharePoint. These are classes in the
Microsoft.SharePoint.Portal.UserProfiles namespace.

[quoted text, click to view]

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