How can I verify the username / password using System.DirectoryServices.Protocol?

Question

Firstly, I cannot use Active Directory , so I cannot use System.DirectoryServicesdirectly. This will be the computer sending the request to the Novell network, where it is supported only System.DirectoryServices.Protocol.

I am sure that I need to provide the correct SearchRequest.

This is what I still have:

private static String _certificatePath;
private static String _server;

private static SearchResponse Query(String user, String pwd, out String error)
{
    SearchResponse result = null;
    error = String.Empty;
    if (File.Exists(_certificatePath))
    {
        var identifier = new LdapDirectoryIdentifier(_server, false, false);
        try
        {
            using (var connection = new LdapConnection(identifier))
            {
                connection.SessionOptions.ProtocolVersion = 3;
                var cert = new X509Certificate();
                cert.Import(_certificatePath, null, X509KeyStorageFlags.DefaultKeySet);
                connection.ClientCertificates.Add(cert);
                connection.AuthType = AuthType.External;
                connection.AutoBind = false;
                var request = new SearchRequest()
                {
                    DistinguishedName = user, //Find this person
                    Filter = "(objectClass=*)", //The type of entry we are looking for
                    Scope = System.DirectoryServices.Protocols.SearchScope.Subtree, //We want all entries below this ou
                };
                result = (SearchResponse)connection.SendRequest(request); //Run the query and get results
            }
        } catch (Exception err)
        {
            error = String.Format("SDSP::Query {0}: {1}", err.GetType(), err.Message);
        }
    }
    else
    {
        error = "The system cannot find the Cryptography Certificate at the path specified in the Application Configuration file.";
    }
    return result;
}

How to create SearchRequest to check user/ combination pwd?

var request = new SearchRequest()
{
    DistinguishedName = user, //Find this person
    Filter = "(objectClass=*)", //The type of entry we are looking for
    Scope = System.DirectoryServices.Protocols.SearchScope.Subtree, //We want all entries below this ou
};

Answer 1

In windows

You can add a parameter ContextOptions.Negotiatefor ValidateCredentials(Username and Password).

const int ldapErrorInvalidCredentials = 0x31;

const string server = "sd.example.com:636";
const string domain = "sd.example.com";

try
{
    using (var ldapConnection = new LdapConnection(server))
    {
        var networkCredential = new NetworkCredential(_username, _password, domain);
        ldapConnection.SessionOptions.SecureSocketLayer = true;
        ldapConnection.AuthType = AuthType.Negotiate;
        ldapConnection.Bind(networkCredential);
    }

    // If the bind succeeds, the credentials are valid
    return true;
}
catch (LdapException ldapException)
{
    // Invalid credentials throw an exception with a specific error code
    if (ldapException.ErrorCode.Equals(ldapErrorInvalidCredentials))
    {
        return false;
    }

    throw;
}

Sources:

• How to check Active Directory rights on LDAP + SSL?
• https://msdn.microsoft.com/en-us/library/bb300969(v=vs.110).aspx
• https://msdn.microsoft.com/en-us/library/system.directoryservices.accountmanagement.contextoptions(v=vs.110).aspx

---

Novell

DirectoryEntry DirectorySearcher , Active Directory.

//use the users credentials for the query
DirectoryEntry root = new DirectoryEntry(
    "LDAP://dc=domain,dc=com", 
    loginUser, 
    loginPassword
    );

//query for the username provided
DirectorySearcher searcher = new DirectorySearcher(
    root, 
    "(sAMAccountName=" + loginUser + ")"
    );    

//a success means the password was right
bool success = false; 
try {
    searcher.FindOne();
    success = true;
}
catch {
    success = false;
}

.

Answer 2

, , .

, admin "userPassword", , . , - .

, , :

        var server = "<SERVER:PORT>";
        var adminUser = "<USERNAME>";
        var adminPass = "<PASSWORD>";

        using (var ldap = new LdapConnection(server))
        {
            ldap.SessionOptions.ProtocolVersion = 3;
            // To simplify this example I'm not validating certificate. Your code is fine.
            ldap.SessionOptions.VerifyServerCertificate += (connection, certificate) => true;
            ldap.SessionOptions.SecureSocketLayer = true;

            ldap.AuthType = AuthType.Basic;
            ldap.Bind(new System.Net.NetworkCredential($"cn={adminUser},o=<ORGANIZATION>", adminPass));

            // Now I will search to find user DN.
            // If you know exact DN, then you don't need to search, go to compare request directly.
            var search = new SearchRequest
            {
                //Here goes base DN node to start searching. Node closest to entry improves performance.
                // Best base DN is one level above.
                DistinguishedName = "<BASEDN>", //i.e.: ou=users,o=google
                Filter = "uid=<USERNAME>",
                Scope = SearchScope.OneLevel
            };

            // Adding null to attributes collection, makes attributes list empty in the response.
            // This improves performance because we don't need any info of the entry.
            search.Attributes.Add(null);

            var results = (SearchResponse)ldap.SendRequest(search);

            if (results.Entries.Count == 0)
                throw new Exception("User not found");

            // Because I'm searching "uid" can't exists more than one entry.
            var entry = results.Entries[0];

            // Here I use DN from entry found.
            var compare = new CompareRequest(entry.DistinguishedName, new DirectoryAttribute("userPassword", "<PASSWORD>"));
            var response = (CompareResponse)ldap.SendRequest(compare);

            if (response.ResultCode != ResultCode.CompareTrue)
                throw new Exception("User and/or Password incorrect.");
        }