On Wed, Feb 18, 2015, Stephan M?hlstrasser wrote:

> 
> What is the meaning of setting the OCSP_NOEXPLICIT flag resp. using
> the "-no_explicit" command line option. What exactly is checked by
> the X509_check_trust() call above with respect to the relevant RFCs?
> 

If the responder root CA is set to be trusted for OCSP signing then it can be
used to sign OCSP responses for any certificate (aka a global responder). This
comes under:

   1. Matches a local configuration of OCSP signing authority for the
   certificate in question

or alternatively:

   Additional acceptance or rejection criteria may apply to either the
   response itself or to the certificate used to validate the signature
   on the response.

from RFC2560 et al.

If the -no_explicit flag is set or OCSP_NOEXPLICIT is set then this behaviour
is disabled.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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