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RE: way to validate server certificate

On Tue, 23 Sep 2014, Bin Lu wrote:


Dieter,

I know how to do it using openssl lib functions. But I am looking for openldap support.
OpenLDAP support for what? You've talked about standards used for applications verifying subject names, configuration of CAs, and opened an aside regarding in-memory CAs so far. 

verifying names:
Howard's told you what specs libldap implements, the support is there. Read the code if you don't believe him. 

configuring CAs/in-memory CAs:
The TLS library providers can tell you what each of their libraries implement. (And it's most definitely not OpenLDAP's job to duplicate what the TLS libraries already provide...) You can find the related libldap/slapd configuration directives in the appropriate man pages. These are typically passed straight to the crypto libraries, though, so a thorough understanding of your chosen crypto library is key. (Keep in mind that OpenLDAP supports a compile-time choice of multiple crypto providers.) 



Thanks,
-binlu

-----Original Message-----
From: openldap-technical [mailto:openldap-technical-bounces@openldap.org] On Behalf Of Dieter Kl?nter
Sent: Monday, September 22, 2014 12:25 PM
To: openldap-technical@openldap.org
Subject: Re: way to validate server certificate

<html>
Am Mon, 22 Sep 2014 17:51:02 +0000
schrieb Bin Lu <blu@paloaltonetworks.com>:


Hi Howard,

The RFCs specify the protocol, but not all releases implement the full
protocol.

I briefly went through the openLdap APIs but could not find the APIs
to do server id check.  LDAP_OPT_X_TLS_CACERTFILE and
LDAP_OPT_X_TLS_CACERTDIR seem to be for server cert validation, but I
don't see how it does the hostname matching.

If would be helpful if somebody could point me the actual API(s) that
does this.


That depends on the included TLS library, for openSSL you might want to read https://urldefense.proofpoint.com/v2/url?u=https-3A__www.openssl.org_docs_ssl_ssl.html-23DEALING-5FWITH-5FPROTOCOL-5FMETHODS&d=AAIFaQ&c=V9IgWpI5PvzTw83UyHGVSoW3Uc1MFWe5J8PTfkrzVSo&r=OoT5VLtV-av2TWtGCL3lvAfjqGLD0FLH3lQvyqxLjdc&m=S_ZUWYF6j0hu1QhwXZPcobptcN9AaxM2LSp-S7mwnzU&s=u2oGRu4BAahLkAvOy4jLniKlVlJ1DI_Sv0fqx2SK_Y8&e=


-Dieter



Thanks,

-----Original Message-----
From: Howard Chu [mailto:hyc@symas.com]
Sent: Friday, September 19, 2014 8:10 PM
To: Bin Lu; openldap-technical@openldap.org
Subject: Re: way to validate server certificate

Bin Lu wrote:

Hi,

Does openldap provide APIs to do server certificate validation? Can
I retrieve the server cert from LDAP connection and do the
validation myself or by passing the trusted CA list openldap will do
it (in this case, how the hostname matching with the subject DN is
performed)?


OpenLDAP libldap does server certificate validation according to
RFC2830 and 4513. It would be a mistake to duplicate that
functionality and do the validation yourself.


Thanks a lot in advance,

-blu








--
Dieter Kl?nter | Systemberatung
https://urldefense.proofpoint.com/v2/url?u=http-3A__sys4.de_&d=AAIFaQ&c=V9IgWpI5PvzTw83UyHGVSoW3Uc1MFWe5J8PTfkrzVSo&r=OoT5VLtV-av2TWtGCL3lvAfjqGLD0FLH3lQvyqxLjdc&m=S_ZUWYF6j0hu1QhwXZPcobptcN9AaxM2LSp-S7mwnzU&s=58Dib58wruVfi54NPs1PDVD2cXA13wMLqBpDvPSLcdQ&e=
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