Re: can you define stream reassembly in a rule?

["Carter Waxman \(cwaxman\) via Snort-users" <snort-users () lists snort org>]

You probably won’t get the result you are looking for. Stream needs to gather enough state to reassemble a PDU and it 
likely won’t happen midstream + in a single packet (seq/ack analysis or PAF for instance). If some of the PDU you 
wanted to capture occurred in a prior wire packet, stream would not have saved it so it’s probably too late to run your 
full content. stream_reassemble is most useful in performing actions for the sake of future traffic, no the current 
traffic, so reassembling by snort.conf might be a better option.

- Carter
From: Snort-users <snort-users-bounces () lists snort org> on behalf of phez asap via Snort-users <snort-users () lists 
snort org>
Reply-To: phez asap <phez.asap () gmail com>
Date: Tuesday, November 27, 2018 at 1:14 PM
To: "snort-users () lists snort org" <snort-users () lists snort org>
Subject: [Snort-users] can you define stream reassembly in a rule?

Is it possible to define stream reassembly in a rule to take place before a content statement (I am guessing no but 
thought I would ask)?  Something like stream_reassemble:enable,both rule option?

Ex: If an incoming packet is going to a given IP address and given port reassemble it before content matching.

I know normally for the stream5 preprocessor to reassemble a stream the port needs to be defined in the snort.conf file 
under
preprocessor stream5_tcp: "ports client" or "ports both" config.

Thanks,


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