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Re: (ITS#4941) incorrect description of TLS_REQCERT setting
Philip Guenther wrote:
> On Mon, 30 Apr 2007, Howard Chu wrote:
>> firstname.lastname@example.org wrote:
>>> - 'allow' checks the identity of the server vs its cert (per RFC 4513,
>>> section 3.1.3) and will terminate the connection if they don't match
>>> - 'try' is the same as 'demand' and 'hard'
>> Not quite. With both "allow" and "try" it's OK if the server provides no
> That's true of 'demand' and 'hard' as well. The only difference between
> 'try' and 'demand' in the code is that the latter passes
> SSL_CTX_set_verify() the SSL_VERIFY_FAIL_IF_NO_PEER_CERT flag, but that
> flag has NO EFFECT on SSL clients. This is documented on the
> SSL_CTX_set_verify() manpage and confirmed by grepping the openssl source
> for it.
> If you don't believe me, I suggest you try configuring your server to
> accept the ADH suites (don't forget to set TLSDHParamFile to /dev/null)
> and give ldapsearch a whirl with
> in your environment. That's what I did.
When this text was written, there was no support for anonymous cipher suites.
So the meaning of the text is: assuming a cipher suite that actually uses
certificates, the client would proceed even if the server didn't provide a
cert. It's entirely possible that this circumstance has been overcome by other
developments. Most likely this hasn't been a valid use case for quite a long
time. But it has nothing to do with Diffie-Hellman key exchanges...
-- Howard Chu
Chief Architect, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/