LDAP authentication scheme has stopped working

I have two servers, each with its own DB and APEX applications. To simplity, let's call them A and b. authentication is handled through a LDAP schema - and this regime is the same on both servers. After a few patches on A (I have yet to find out what that this application of fixes) I am no longer able to connect to one of the applications. However, using the same user/pass I can connect fine on server b (not talking dev backend for APEX, just the connection of the ordinary user in an application). Also, I changed absolutely nothing about the applications or the authentication scheme. So for now, I'm running with the idea that something happened during the patch.

Here are the APEX vs on both servers:

A: APEX 3.2

B: APEX 4.0

Looking at the authentication scheme, trying to detect the differences, the only thing I could find is that B also has a "Use SSL" option. But it is set to N, in any case. Yet once, these worked very well they were until now.

I decided to test and run the following code on both servers:

BEGIN
IF APEX_LDAP.AUTHENTICATE(
    p_username =>     'user.name',
    p_password =>     'ultrasecretpassword',
    p_search_base =>  'cn=users dc=my, dc=domain, dc=com',
    p_host =>         'host.my.domain.com',
    p_port => 389) THEN
    dbms_output.put_line('authenticated');
ELSE
    dbms_output.put_line('authentication failed');
END IF;


END;

Not surprisingly, that said "authenticated" on B, and 'authentication failed' in a.. So, I decided to go a little further and run the following:

-- Code by Scott Spadofore
-- OTN: https://forums.oracle.com/forums/thread.jspa?threadID=954602
DECLARE
  l_retval PLS_INTEGER;
  l_retval2 PLS_INTEGER;
  l_session dbms_ldap.session;
  l_ldap_host VARCHAR2(256);
  l_ldap_port VARCHAR2(256);
  l_ldap_user VARCHAR2(256);
  l_ldap_passwd VARCHAR2(256);
  l_ldap_base VARCHAR2(256);
BEGIN

  l_retval := -1;
  dbms_ldap.use_exception := TRUE;
  l_ldap_host := 'host.my.domain.com';
  l_ldap_port := '389';
  l_ldap_user := 'cn=user.name,cn=users, dc=my,dc=domain,dc=com';
  l_ldap_passwd := 'ultrasecretpassword';

  l_session := dbms_ldap.init(l_ldap_host, l_ldap_port);
  l_retval := dbms_ldap.simple_bind_s(l_session,
  l_ldap_user,
  l_ldap_passwd);
  dbms_output.put_line('Return value: ' || l_retval);
  l_retval2 := dbms_ldap.unbind_s(l_session);

EXCEPTION
  WHEN OTHERS THEN
    dbms_output.put_line(rpad('ldap session ', 25, ' ') || ': ' ||
    rawtohex(substr(l_session, 1, 8)) || '(returned from init)');
    dbms_output.put_line('error: ' || SQLERRM || ' ' || SQLCODE);
    dbms_output.put_line('user: ' || l_ldap_user);
    dbms_output.put_line('host: ' || l_ldap_host);
    dbms_output.put_line('port: ' || l_ldap_port);

    l_retval := dbms_ldap.unbind_s(l_session);
END;

VERY surprisingly (or unfortunately), it displays the same thing on both A and B: "return value: 0.

Go to B and APEX LDAP test, I found that if I enable SSL, auth begins without too much. Clearly, it should be turned off to make it work. I'm picking on it because it's the only difference I could find between the two: A, being an older version does not have any what specifications on whether or not to use SSL (and I guess it's not, because I can't find anything in the docs).

In the APEX, the DN is:

cn=%LDAP_USER%,cn=users, dc=my,dc=domain,dc=com

... and uses no edit function, or anything like that. It's as simple as the host name, port, DN

I am at a loss here, so any help would be appreciated! Thanks in advance!

Finally two thoughts.

During the ACL test - make sure this isn't a privileged account. Users like SYS will bypass the ACL and give false positives.

Second - the script you have above is designed for the APEX 4.1 (APEX_040100). Make sure you adjust respectively for APEX 3.2 or 4.2.

Also, if you want a few quick scripts to test / display the ACL settings, there are examples all over the internet. I've added a few to the pile here: Oracle ACL configuration Scripts. W.P. Hill Tech

Maybe they will help.

Good luck.

-Tim St.

Tags: Database

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