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Re: Client App and STARTLS auth

On 06/10/2011 10:32 PM, Massimiliano Pala wrote:
Hi Rich,

to provide a better vision, I am trying to use openldap to connect to a server and ignoring errors in authentication of the certificates. I am working on a

In particular the code I wrote is like this:

  ldap_initialize(&ld, url);

  if(crypto_api == LDAP_CRYPTO_API_OPENSSL)
    // This Works..
    SSL_CTX *ctx = NULL;

    int opt_val = 0;

if(ldap_set_option(ld, LDAP_OPT_X_TLS_NEWCTX, &opt_val) != LDAP_OPT_SUCCESS)
      /// ERROR if here (does not happen)

    // This works till now

    opt_val = LDAP_OPT_X_TLS_TRY;
    if(ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, &opt_val) !=
      if(ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &opt_val) !=
        // Error

    m_error = ldap_start_tls_s(corePnt->m_ldap, NULL, NULL);


Note that m_error gets a -11...

On the server the output (-d 1) is:

connection_get(14): got connid=1007
connection_read(14): checking for input on id=1007
TLS: error: accept - force handshake failure: errno 11 - moznss error -5938
TLS: can't accept: (unknown).
-5938 is 'end of file encountered' i.e. the client just disconnected

I have no clue why this is not working.

Another thing which is interesting.. on Ubuntu I tried to change the TLS_CERTREQ option to "allow" ... and the code works - but I can not have it working by
using the ldap_set_option().. (on Fedora 14/15 setting the option in the
ldap.conf file - in /etc/openldap/ - does not work..).
Try this, on fedora 14/15

LDAPTLS_REQCERT=never ldapsearch -x -d 1 -ZZ -H ldap://yourhost:yourport -s base -b "" > output.log 2>&1

paste the output to fpaste.org (please obscure any sensitive information first)

email the link to this list

Heeeeeellp!!! :D


On 06/10/2011 10:50 PM, Rich Megginson wrote:
On Fri, Jun 10, 2011 at 4:19 PM, Massimiliano Pala<pala@isis.poly.edu> wrote:
Hi Philip, all,

thanks for the advice. I have changed the code.. and the option is set
correctly. Question, do you think it is safe to do this as a fallback:

    if(ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT,&level) !=
      if(ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,&level) !=
        /// Total Failure

Still.. although I set the option, I still get the -11 error when
trying to bind.

What -11 error?  Client or server?  Can you run with -d 1 to get
detailed trace information?

Is there any other option I have to set to "disable" certificate
verification for non-openssl crypto api ?


On 06/10/2011 05:23 PM, Philip Guenther wrote:

Howard has already pointed out that the value must be an LDAP_OPT_X_TLS_* constant and not a string; I just wanted to add that in version 2.3 and earlier, that option (and most of the other TLS options) could only be set
globally: ldap_set_option() would fail for them if the first argument
wasn't NULL.  So, make sure you're building against a current version.

Philip Guenther



Massimiliano Pala, Ph.D.
Director, OpenCA Labs
Professor, NYU Poly