LDAP Authentication
From: Kurtis Golding (kurtisgolding@hotmail.com)
Date: 06/04/02
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From: "Kurtis Golding" <kurtisgolding@hotmail.com> Date: Mon, 3 Jun 2002 19:29:34 -0700
Is it possible to use the
System.DirectoryServices.DirectoryEntrie class to do a
basic user authorization against a NON Microsoft V3 LDAP
directory? I have seen a few code examples and news
posting that claim this is possible, but I am having a
difficult time getting it to work. I can use the
System.DirectoryServices class members to browse the
directory, but I have not been able to do an
authentication with it. I am aware that this is not a
recommended way to do user authentication, but it seems
to be an expedient way to accomplish what I am trying to
do. (PS: If there is a better way to do this I am open to
suggestion)
Here is an example of the method I am attempting to write:
public bool authenticateUser(String uid, String pw)
{
// The getEntryPath(uid) get the
full path
// for this auth call
String myPath = getEntryPath
(uid);
//It looks something like:
//"LDAP://my.directory.com/
//uid=MyUserID,o=my.company.com,c=us";
DirectoryEntry entry = new
DirectoryEntry(myPath);
// AuthenticationTypes.None sets the control to use //the
most basic form
// of authentication - I Think?
entry.AuthenticationType =
AuthenticationTypes.None;
//Set the user name and password.
entry.Username = uid;
entry.Password = pw;
try
{
// Force the entry to bind or
interact with the LDAP //
Server. I assume I can call a number of different
// methods here and
// get the same behavior.
entry.RefreshCache();
// User Found, Credentials passed
inspection.
return true;
}
catch(Exception Ex)
{
// Object Not Found Exception - User //Credentials Failed
return false;
}
}
The error output of Ex is:
System.Runtime.InteropServices.COMException (0x80072030):
There is no such object on the server
at System.DirectoryServices.DirectoryEntry.Bind
(Boolean throwIfFail)
at System.DirectoryServices.DirectoryEntry.Bind()
at System.DirectoryServices.DirectoryEntry.RefreshCache
()
at ActiveDirectory.Form1.authenticateUser(String uid,
String pw)
If I leave the password blank, it will find the user. If
I supply a password, it will not find anything - even if
the password is correct, and throw that exception. So I
must being doing something wrong, or this library is not
compatible with all LDAP servers.
Any help would be greatly appreciated,
Kurt
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