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RE: Flexibility to use customized "verify_callback" while using O penLdap with TLS (ITS#2767)
Thanks a lot for your comments. I will modify my code to provide
those options through ldap_set_options (I will wait for comments
from others so that I can make all these changes in one shot :)).
The way TLS_CTX is set right now, it does not provide enough
flexibility to the user of -ldap to customize things based on
his requirements. For example,
1. "verify_callback", depending on the application, the user
may like to handle certificate in their on customized way.
However, -ldap forces the user to use the default way the
openldap provides, that is to use "tls_verify_cb" or use
2. verify depth. I don't see any options in TLS_CTX to control
3. -ldap forces the user to specify the cert files in the PEM format
in a file.
I do agree with you that it may not be a good option to expose
too much of OpenSsl to the user. However, I don't see a problem
with exposing TLS to the user if we wants to use OpenLdap over
TLS/SSL. If OpenLdap supports running over TLS, I guess, we should
provide complete set of options to customize TLS on the need
I will add the COPYRIGHT file.
Thank you again for your feedback.
From: Kurt D. Zeilenga [mailto:Kurt@OpenLDAP.org]
Sent: Tuesday, October 14, 2003 3:04 PM
To: Kumar, Prashant [BL60:437:EXCH]
Subject: Re: Flexibility to use customized "verify_callback" while using OpenLdap with TLS (ITS#2767)
A couple of quick comments (without really look at your tls.c patch... I'll leave most of that to others who are more familiar with that code).
Setting of options should be done through the ldap_set_option(3) API. Likely should support global and per-session callbacks. ldap_set_option(3) supports both. Also, we shouldn't provide options for things which can be managed through the TLS_CTX option. That is, -lldap should avoid knowing too much about OpenSSL and/or TLS details.
Lastly, no file in the tarball include a notice See for guidelines. I suggest you provide a notice in a separate COPYRIGHT file.
At 08:14 AM 10/14/2003, email@example.com wrote:
>Full_Name: Prashant Kumar.
>Version: 2.1.22 (20030709)
>Submission from: (NULL) (220.127.116.11)
>Right now, while using OpenLdap with TLS/SSL, there are no API's to
>specify user customized "verify_callback" and "verify_depth". Also,
>there are no API's to input the CA cert, client cert and client cert
>key onto the SSL context in the binary (DER) format (right now,
>OpenLdap reads all these info from PEM files whose path is specified in
>This enhancement adds following API's to OpenLdap library which will
>allow the user to do all the above things:
>/*To set the verify callback*/
> int (*tls_verify_callback)(int, struct x509_store_ctx_s *));
>/*To set the verify depth*/
>ldap_set_tls_verify_depth (unsigned int verify_depth);
>/*To set the CA cert*/
>ldap_set_tls_cacert_bin (unsigned char *caCert,unsigned int len);
>/*To set the client cert*/
>ldap_set_tls_clientcert_bin (unsigned char *clientcert, unsigned int
>/*To set the client cert key*/
>ldap_set_tls_clientcert_key_bin (unsigned char *clientkey, unsigned int
>I have changed two files "include/ldap.h" and "libraries/libldap/tls.c"
>to accommodate these features and I have uploaded these changes as a
>tar ball (this tar ball has 2 patches, one for ldap.h and other one for
>tls.c) onto "ftp://ftp.openldap.org/incoming/". The tar ball name is