[Oisf-users] TLS rule not matching certificate subject all the time

[Matthew Keeler]

Was using the autofp runmode. I will try with the workers run mode and see if it resolves anything.

Matt Keeler

On Nov 7, 2012, at 5:19 PM, Eric Leblond <eric at regit.org> wrote:

> Hello,
> 
> Le mercredi 07 novembre 2012 à 16:53 -0500, Matthew Keeler a écrit :
>> I am experimenting with some Suricata rules and have a rule of the form
>> 
>> "alert tls any any -> any any (msg: "Some message" tls.subject: "<the cert subject>"; sid:<sid> rev:1; )"
>> 
>> I then run a curl command to reach out to an https enabled website with a certificate that has the same subject as the one in the rule. Sometimes I get the alert and sometimes I do not. It seems rather random when the alert is raised and when it is ignored.
>> 
>> I have verified in Wireshark that the certificate is being sent every time.
>> 
>> Is there a reason why Suricata would only occasionally find the certificate?
> 
> No specific reason. One of the possibility is that there is some
> streaming errors. What is the running mode used ? Workers with flow base
> locad-balancing on top should provide good result and avoid this kind of
> problem.
> 
> 
> BR,
> 
>> 
>> Thanks
>> Matt Keeler--------------------------------------------------------------------
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> 
> 

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