[Snort-users] Grouping connections

Ulisses Araújo Costa ulissesaraujocosta at ...11827...
Wed Apr 22 13:08:19 EDT 2009


Looking at the format of keyword 'tag' seems that:

<count>, <metric>


are needed. Anyway, I will try it.

2009/4/22 Joel Esler <jesler at ...1935...>

> Are you looking for the "flush_on_alert" keyword in Stream5?
>
> Joel
>
>
> 2009/4/22 Ulisses Araújo Costa <ulissesaraujocosta at ...11827...>
>
>> I saw in the forum a person asking (in 2007) something that is the same I
>> want:
>>
>> "so that i would be able to capture mails containing viagra. I am using
>> preprocessor stream4 reassmebly so that i could get the entire mail instead
>> of only the packet containing that string 'viagra'. "
>>
>> I don't need the total packet, but just to identify that as one
>> big-packet, not only the packet containing the string 'viagra', but all the
>> e-mail (the big-packet).
>>
>>
>> 2009/4/22 Ulisses Araújo Costa <ulissesaraujocosta at ...11827...>
>>
>>> 2009/4/22 Ulisses Araújo Costa <ulissesaraujocosta at ...11827...>
>>>
>>>> Joel,
>>>>
>>>> that's what I said:
>>>>
>>>> "
>>>> The problem is I want to make that to connections, not sessions.
>>>>
>>>> If it was sessions I can use the 'flag' keyword.
>>>> "
>>>>
>>>> But I *don't* want sessions.
>>>>
>>>> 2009/4/22 Joel Esler <jesler at ...1935...>
>>>>
>>>>> Take a look at the tag keyword.
>>>>> http://www.snort.org/docs/snort_htmanuals/htmanual_284/node373.html
>>>>>
>>>>
>>> Ah! 'tag' keyword. I'm sorry, seems I read that too fast.
>>> Unfortunately this seems to be limited relative to the size of something:
>>>
>>> tag: <type>, <count>, <metric>, [direction];
>>>
>>> count
>>>       • <integer> - Count is specified as a number of units. Units are
>>> specified in the <metric> field.
>>>
>>> :S
>>>
>>> I want something completely dynamic.
>>>
>>>
>>>
>>>>
>>>>> The flags keyword simply will trigger on the presence of certain TCP
>>>>> flags set in the packet.  This is probably not what you want.
>>>>>
>>>>> J
>>>>>
>>>>> 2009/4/22 Ulisses Araújo Costa <ulissesaraujocosta at ...11827...>
>>>>>
>>>>>>  Hello,
>>>>>>
>>>>>> I'm using Snort in a project. I'm wondering if with Snort I can group
>>>>>> packets from the same connection. For example: if I request
>>>>>> google.com, I just send one packet but the response came in (imagine)
>>>>>> 4 packets. The idea is make Snort just consider that as 2 states (me making
>>>>>> the request and google sending the response). The problem is I want to make
>>>>>> that to connections, not sessions.
>>>>>>
>>>>>> If it was sessions I can use the 'flag' keyword. Now I'm seeing if the
>>>>>> way is using preprocessors, in this case the HTTP preprocessor.
>>>>>>
>>>>>> Can you help me?
>>>>>>
>>>>>> Best Regards,
>>>>>>
>>>>>> --
>>>>>> Ulisses Costa - http://caos.di.uminho.pt/~ulisses/<http://caos.di.uminho.pt/%7Eulisses/>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> joel esler | Sourcefire | gtalk: jesler at ...1935... | 302-223-5974
>>>>> | http://twitter.com/joelesler
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Ulisses Costa - http://caos.di.uminho.pt/~ulisses/<http://caos.di.uminho.pt/%7Eulisses/>
>>>>
>>>
>>>
>>>
>>> --
>>> Ulisses Costa - http://caos.di.uminho.pt/~ulisses/<http://caos.di.uminho.pt/%7Eulisses/>
>>>
>>
>>
>>
>> --
>> Ulisses Costa - http://caos.di.uminho.pt/~ulisses/<http://caos.di.uminho.pt/%7Eulisses/>
>>
>
>
>
> --
> joel esler | Sourcefire | gtalk: jesler at ...1935... | 302-223-5974 |
> http://twitter.com/joelesler
>



-- 
Ulisses Costa - http://caos.di.uminho.pt/~ulisses/
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