C# netcore ldap authentication using Novell.Directory.Ldap.NETStandard library

Question

it is the first time I'm working with LDAP and Active Directory. I have to make a web api with .NetCore that have to authenticate with ActiveDirectory (WindowsServer 2008 r2), I'm following the samples in Novell.Directory.Ldap.NETStandard but i can't understand the way that I must set the parameters. This is the users that I created in ActiveDirectory Server:

In Novell's samples

if (args.Length != 5)
{
    System.Console.Out.WriteLine("Usage:   mono VerifyPassword <host name>" + " <login dn> <password> <object dn>\n" + "         <test password>");
    System.Console.Out.WriteLine("Example: mono VerifyPassword Acme.com " + "\"cn=Admin,o=Acme\" secret\n" + "         \"cn=JSmith,ou=Sales,o=Acme\" testPassword");
    System.Environment.Exit(0);
}

int ldapPort = LdapConnection.DEFAULT_PORT;
int ldapVersion = LdapConnection.Ldap_V3;
System.String ldapHost = args[0];
System.String loginDN = args[1];
System.String password = args[2];
System.String objectDN = args[3];
System.String testPassword = args[4];
LdapConnection conn = new LdapConnection();

try
{
    // connect to the server
    conn.Connect(ldapHost, ldapPort);

    // authenticate to the server
    conn.Bind(ldapVersion, loginDN, password);

    LdapAttribute attr = new LdapAttribute("userPassword", testPassword);
    bool correct = conn.Compare(objectDN, attr);

    System.Console.Out.WriteLine(correct?"The password is correct.":"The password is incorrect.\n");

    // disconnect with the server
    conn.Disconnect();
}

In Novell's samples the "user" parameters looks like this "ou=sales,o=Acme", so I was trying:

int ldapPort = LdapConnection.DEFAULT_PORT;
int ldapVersion = LdapConnection.Ldap_V3;
bool compareResults = false;
String ldapHost = "192.168.58.251";
String loginDN = @"cn=jperez";
String password1 = "Jperez123";
String dn = "mydn";
LdapConnection lc = new LdapConnection();
LdapAttribute attr = null;

try
{
    // connect to the server
    lc.Connect(ldapHost, ldapPort);
    var sdn = lc.GetSchemaDN();

    // authenticate to the server
    lc.Bind(ldapVersion, loginDN, password1);

    ...
}
catch (LdapException e)
{
    Console.WriteLine("Error: " + e.ToString());
}

But I get this error: LDAP:

LdapException: Invalid Credentials (49) Invalid Credentials LdapException: Server Message: 80090308: LdapErr: DSID-0C0903A8, comment: AcceptSecurityContext error, data 52e, v1db1\u0000 LdapException: Matched DN:

I also get the schemaDn with this funciton: lc.GetSchemaDN(), that return this result: CN=Aggregate,CN=Schema,CN=Configuration,DC=mydn,DC=local

After googling there is no much information with .Netcore than the Novell's samples, please I need your help.

Answer 1

Been working on this as well and ran into the same error. I had to use the Windows domain and username to log in:

String loginDN = "DOMAIN\\jperez";
String password1 = "Jperez123";

lc.Bind(loginDN, password1);

Once I did that, I got in without issue.

Answer 2

I had the same issue until I used this

lc.Bind("uid=" + objUser.UserName + ",ou=SomeValue,dc=SomeValue,dc=SomeValue",password);

also I did not supply a version like in your example

Answer 3

It also works for me:

var ldapVersion = LdapConnection.Ldap_V3;
var loginDN = "CN=victor,CN=Users,DC=example,DC=com";
var password = "123";
conn.Bind(ldapVersion, loginDN, password);

Works on Windows Server 2012r2 with the default domain settings. If you want to get loginDNs for your domain users, just execute next cmd command on domain controller:

dsquery user 

More information here

Answer 4

Yet another variation, I found I had to logon as:

"PartA PartB" of an AD username. (notice the space in the name.)

example being "App Alerts" whereas I normally can login with "AppAlerts"... but this is the Fully Qualified name i found with dsquery user:

"CN=App Alerts,OU=SBSUsers,OU=Users,OU=MyBusiness,DC=myinc,DC=local"