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?
On 2019-03-12 14:52, Florea, Cosmin Petre wrote
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
<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
<Data Name="Message">LDAP: make spn returned
'ldap/[.........]' with error 0
<Data Name="Message">ldapBind found GSSAPI auth type on
<Data Name="Message">ldapBind found GSS-SPNEGO auth type on
<Data Name="Message">ldapBind found DIGEST auth type on
<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
<Data Name="Message">wldap32:Server is capable of
<Data Name="Message">ldap_bind returned 0x0 for connection
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?