On Fri, Nov 16, 2012 at 09:45:10AM +0100, Martin.Heinzmann@belden.com wrote:

Hi, i am trying to write my own client which connects to an active directory and searches for an user. So far it works, i call "ldap_initialize", set version 3, "ldap_simple_bind_s" and then search the directory. Now i want the connection to be secure by executing a "Simple TLS handshake ". I changed my hostname variable to "ldaps://ip:636" and tried "ldap_start_tls_s(ld,NULL,NULL)" before the bind but get a "cant contact ldap server" error.

When using ldaps:// libldap will perform the TLS Handshake automatically before sending the first LDAP request to the server. So calling ldap_start_tls_s() on a ldaps:// connection is wrong and results in the above error.

ldap_start_tls_s is for initiating the TLS Handshake on a "normal" ldap:// connection.

See http://www.openldap.org/faq/data/cache/605.html for details.

I think my active directory is configured the right way because with JXplorer it works over ssl and port 636.

Does anyone know which functions i have to call so a successful tls connection will be set up?

If really want to use ldaps:// then specifying the ldaps:// URI in ldap_initialize should be enough. Otherwise use a "ldap://" URI + ldap_start_tls_s

Ralf

...

Hi, i am trying to write my own client which connects to an active directory and searches for an user. So far it works, i call "ldap_initialize", set version 3, "ldap_simple_bind_s" and then search the directory. Now i want the connection to be secure by executing a "Simple TLS

handshake

...

". I changed my hostname variable to "ldaps://ip:636" and tried "ldap_start_tls_s(ld,NULL,NULL)" before the bind but get a "cant contact ldap server" error.

When using ldaps:// libldap will perform the TLS Handshake automatically

before

sending the first LDAP request to the server. So calling ldap_start_tls_s

() on

a ldaps:// connection is wrong and results in the above error.

ldap_start_tls_s is for initiating the TLS Handshake on a "normal" ldap:// connection.

See http://www.openldap.org/faq/data/cache/605.html for details.

...

I think my active directory is configured the right way because with JXplorer it works over ssl and port 636.

Does anyone know which functions i have to call so a successful tls connection will be set up?

If really want to use ldaps:// then specifying the ldaps:// URI in ldap_initialize should be enough. Otherwise use a "ldap://" URI + ldap_start_tls_s

Ralf

Hi, thank you, thats some good advice. So i will try now with "ldap://..." and ldap_start_tls_s. Unfortunately now i get the error "Connect error" from ldap_start_tls_s. I set the option "LDAP_OPT_X_TLS_ALLOW" but that changes nothing. Since i am using my own client i don't have any ldaprc or ldap.conf files....maybe i have to set some options in my client to tell it to use simple tls handshake? Wireshark shows me that the client sends a "extendedReq(1) LDAP_START_TLS_OID" package to which the server answeres. Then the "Client hello" and "Server hello" with the servers certificate appears. After that the client sends a "Alert (Level: Fatal, Description: Unkown CA) package. Short after that the server resets the connection. I enabled debugging with the option "LDAP_OPT_DEBUG_LEVEL" and now i see a message, that the client is expexting a local issuer certificate which it can't find. Is there a way to tell the client that he won't get an own certificate?

Regards Martin DISCLAIMER:

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