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Re: Problem with TLS handshake in some browsers when OCSP stapling enabled

Maxim Dounin
December 12, 2013 10:26AM
Hello!

On Thu, Dec 12, 2013 at 11:59:26AM +0400, kyprizel wrote:

> Hi,
> we got a problem with OCSP stapling.
>
> During the handshake some browsers send TLS extension "certificate status"
> with more than 5 bytes in it.
> In Nginx error_log it looks like:
>
> [crit] 8721#0: *35 SSL_do_handshake() failed (SSL: error:0D0680A8:asn1
> encoding routines:ASN1_CHECK_TLEN:wrong tag error:0D08303A:asn1 enco
> ding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error error:1408A0E3:SSL
> routines:SSL3_GET_CLIENT_HELLO:parse tlsext) while SSL handshaking, client:
>
> If we disable OCSP stapling - everything works fine. Looks like the problem
> is on the browser side and in OpenSSL tls ext parsing function. But can we
> make it just ignore the incorrect (?) tls extension than dropping SSL
> hanshake?

I don't think it's possible to do anything in nginx here. Try
looking at the relevant OpenSSL code - if the server status
callback is set, it parses the extension, and if a parsing error
happens - the error is returned.

It should be possible to work it around in OpenSSL code though.

--
Maxim Dounin
http://nginx.org/

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Subject Author Posted

Problem with TLS handshake in some browsers when OCSP stapling enabled

kyprizel December 12, 2013 03:00AM

Re: Problem with TLS handshake in some browsers when OCSP stapling enabled

Maxim Dounin December 12, 2013 10:26AM



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