Hi,

In the meantime, i learned from the DirectoryEntry's source file that an anonymous bind is made first to URL "LDAP://RootDSE", then the name of the domain is read from property "defaultNamingContext", then a second bind with sAMAccountName@domain is made. The problem is that i don't know how do do it with OpenLDAP API. Do you have any examples?

Thank you.

On 2019-03-12 14:52, Florea, Cosmin Petre wrote

Hello,

I have a LDAP Linux client written with OpenLDAP and i need it to be able to authenticate a user only by username and password (no domain). By username i mean the sAMAccountName from the LDAP record. The bind succeeds if i use "username@domain" or if i use the userPrincipalName (which is not equal to sAMAccountName), but i am unable to make it work just with username. Anonymous ldap_bind followed by a ldap_search does not work (it works if the bind is not anonymous).

I have also a windows client (not using openldap library) implemented with DirectoryEntry from C#. The login with just the username works fine in that implementation (connected to the same LDAP server). In the LDAP log file on Windows i see (i put [...] to hide the server address):

        <Data Name="Message">ldap_bind called for connection 0xd059b718: DN is (null). Method is 0x486. Synchronous is 0x1.
        <Data Name="Message">ldapBind found server is Windows 2003 or better AD on connection 0xd059b718
        <Data Name="Message">Connection->hostname is '[.........]'
        <Data Name="Message">Connection->DnsSuppliedNAme is '[.........]'
        <Data Name="Message">Connection->DomainName is '(null)'
        <Data Name="Message">LDAP: make spn returned 'ldap/[.........]' with error 0
        <Data Name="Message">ldapBind found GSSAPI auth type on connection 0xd059b718
        <Data Name="Message">ldapBind found GSS-SPNEGO auth type on connection 0xd059b718
        <Data Name="Message">ldapBind found DIGEST auth type on connection 0xd059b718
        <Data Name="Message">ldap bind: Server is v3
        <Data Name="Message">ldap bind: Server supports both GSS-SPNEGO and GSSAPI
        <Data Name="Message">New servicename for bind is 'ldap/[.........]'
        <Data Name="Message">wldap32:Server is capable of 'NTLM'
        <Data Name="Message">ldap_bind returned 0x0 for connection 0xd059b718.

So on windows it does ldap_bind 2 times , but i think it is using a different mechanism, probably Windows specific (i mean not ldap_search) to retrieve the userPrincipalName associated with the sAMAccountName from input.

I do not have an account that i can use to make the initial bind (my client should work with several distinct servers). My question is: how to do it on linux with OpenLDAP? Is it possible?

Thank you.