Using C# to authenticate user against LDAP

Question

I'm using DirectorySearcher to search for a user entry in LDAP server.

DirectoryEntry de = new DirectoryEntry(); de.Path = "LDAP://myserver/OU=People,O=mycompany"; de.AuthenticationType = AuthenticationTypes.None;  DirectorySearcher deSearch = new DirectorySearcher();  deSearch.SearchRoot = de; deSearch.Filter = "(uid=" + model.UserName + ")";  SearchResult result = deSearch.FindOne(); 

I'm able to get th intended output in result variable.
However If I try to authenticate the same user by providing password in directory entry, I always get following error.

"The user name or password is incorrect."

DirectoryEntry entry = new DirectoryEntry("LDAP://myserver/OU=People,O=mycompany", username, password); DirectorySearcher search = new DirectorySearcher(     entry,     "(uid=" + username + ")",     new string[] { "uid" } );  search.SearchScope = System.DirectoryServices.SearchScope.Subtree; SearchResult found = search.FindOne();   ->>>>>this is where I get wrong credential error. 

The username and password are for the user I want to authenticate.

Can anyone tell me what I'm doing wrong here or how to debug this.

Answer 1

This username, password within this line:

DirectoryEntry("LDAP://myserver/OU=People,O=mycompany", username, password); 

should be for an account that has permission for directory lookup. It could be a service account or testing purpose try with your own. This shouldn't be the user/pass of someone who you are trying to authenticate.

If you want to authenticate, you can use following steps using PrincipalContext:

using(var context = new PrincipalContext(ContextType.Domain, "mydomain", "mydomain\serviceAcct", "serviceAcctPass")) {  //Username and password for authentication.  return context.ValidateCredentials(username, password);  } 

"serviceAcct" = an account within domain users that has permission for directory lookup. "serviceAcctPass" = password for that service account. As I said, for testing you can try with your own user/pass context.

Also, make sure supplied username has either "domain\username" or "username@domain" formatting.