Zhumabekov - discussion of mod_ssl for httpd 2.x takes place on the
deveopment list for Apache httpd, CC'ed. (I'm quoting the full mail
inline for reference of dev@ readers)
On Wed, May 06, 2009 at 10:49:46AM +0600, Zhumabekov Yerden wrote:
> mod_ssl can perform client authentication on certificate in
> Apache and client authorization on certain certificate extensions. We
> are setting up CA here and we want to restrict access to certain website
> by checking the presence of certain certificate extension using its OID.
> The syntax which mod_ssl is forcing us to use is the following:
>
> <Location />
> SSLRequire “some string” in OID(“1.2.3.4…..”)
> </Location>
>
> As you can see, we need to match this string exactly in extension’s
> value. We can encounter problem with this, because this extension may
> not be listed in openssl list of valid extensions
> (crypto/objects/objects.h). As I learned the mod_ssl and openssl code,
> mod_ssl would not be able to match the string because the object of this
> OID does not have valid NID in openssl. OpenSSL seems incapable of
> determining the type of arbitrary extension we want to use as
> restricting factor. Hence, mod_ssl can not even extract its value from
> certificate.
> Well, I poked around the problem for some time and found no
> other way than to patch mod_ssl by adding one new function in
> ssl_expr_eval.c which does almost the same thing as ssl_extlist_by_oid()
> and ssl_expr_eval_oid() but does not intend to extract the value of
> certificate extension. I also added some change to ssl_expr_eval_comp(),
> so if you supply the zero-length word in SSLRequire, it uses my new
> function instead of ssl_expr_eval_oid(). So, the new syntax is like this:
>
> <Location />
> SSLRequire “” in OID(“1.2.3.4…..”)
> </Location>
>
> If you are aware of more attractive and “right” way to make
> it, please acknowledge. My patch for apache-2.2.11 is attached.
I'd rather see a different syntax used for the new semantics, such as:
SSLRequire has_oid("1.2.3.4")
though I'm not sure whether the SSLRequire parser can cope with that.
Regards, Joe
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