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CRL vs OCSP for EV SSL Certificates

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5. October 2011, 15:39:03

pkiguru

Posts: 4

CRL vs OCSP for EV SSL Certificates

Does the Opera 11 browser require support for OCSP for EV SSL certificates?

I know that CA Browser forum has included this as a requirement for their members, but I see that neither IE8 nor Firefox7 is very strict when it comes to lack of OCSP support.

One example of a web site protected by an EV SSL certificate not supporting OCSP is https://www.accenture.com/. I am not able to access this site with Opera. Can someone confirm that the reason is lack of OCSP URI in the certificate?

5. October 2011, 17:05:33

Krake

Posts: 3136

The reason is browser sniffing.
Fake the UA and you will be able to access the site with Opera.
Every morning in Africa, a gazelle wakes up. It knows it must run faster than the fastest lion or it will be killed.
Every morning a lion wakes up. It knows it must outrun the slowest gazelle or it will starve to death.
It doesn't matter whether you are a lion or a gazelle: when the sun comes up, you'd better be running.

6. October 2011, 06:58:35

pkiguru

Posts: 4

Thank you for your answer, although I have no knowledge about sniffing and this UA (whatever that is). A typical user may fake a lot using different IT tools, but I don't relate Opera browser to such activities.

Anyway, I found that the site was able to respond successfully from this link: https://acn-prod-sts.accenture.com/.
This confirms that Opera is able to trust EV SSL sites without use of OCSP.

6. October 2011, 09:27:08

Krake

Posts: 3136

Some sites deliberately block Opera. The easiest way for doing it is to look after the UserAgent.(browser sniffing)
Every browser identifies itself through the UserAgent string [eg: Opera/9.80 (Windows NT 5.1; U; en) Presto/2.9.168 Version/11.51] it is sending to a server.
Therefore Opera allows you (Preferences\Advanced\Content\Manage Site Preferences\Add...\Network) to fake/mask the UserAgent to Internet Explorer or Firefox.
Every morning in Africa, a gazelle wakes up. It knows it must run faster than the fastest lion or it will be killed.
Every morning a lion wakes up. It knows it must outrun the slowest gazelle or it will starve to death.
It doesn't matter whether you are a lion or a gazelle: when the sun comes up, you'd better be running.

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