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Introduce two new events for analyzer confirmation and analyzer violation reporting. The current analyzer_confirmation and analyzer_violation events assume connection objects and analyzer ids are available which is not always the case. We're already passing aid=0 for packet analyzers and there's not currently a way to report violations from file analyzers using analyzer_violation, for example. These new events use an extensible Info record approach so that additional (optional) information can be added later without changing the signature. It would allow for per analyzer extensions to the info records to pass analyzer specific info to script land. It's not clear that this would be a good idea, however. The previous analyzer_confirmation and analyzer_violation events continue to exist, but are deprecated and will be removed with Zeek 6.1.
41 lines
1.3 KiB
Text
41 lines
1.3 KiB
Text
##! Adjust the inactivity timeouts for interactive services which could
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##! very possibly have long delays between packets.
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module Conn;
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export {
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## Define inactivity timeouts by the service detected being used over
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## the connection.
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option analyzer_inactivity_timeouts: table[AllAnalyzers::Tag] of interval = {
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# For interactive services, allow longer periods of inactivity.
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[[Analyzer::ANALYZER_SSH, Analyzer::ANALYZER_FTP]] = 1 hrs,
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};
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## Define inactivity timeouts based on common protocol ports.
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option port_inactivity_timeouts: table[port] of interval = {
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[[21/tcp, 22/tcp, 23/tcp, 513/tcp]] = 1 hrs,
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};
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}
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event analyzer_confirmation_info(atype: AllAnalyzers::Tag, info: AnalyzerConfirmationInfo)
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{
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if ( atype in analyzer_inactivity_timeouts && info?$c )
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set_inactivity_timeout(info$c$id, analyzer_inactivity_timeouts[atype]);
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}
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event connection_established(c: connection)
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{
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local service_port = c$id$resp_p;
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if ( c$orig$state == TCP_INACTIVE )
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{
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# We're seeing a half-established connection. Use the
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# service of the originator if it's well-known and the
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# responder isn't.
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if ( service_port !in likely_server_ports && c$id$orig_p in likely_server_ports )
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service_port = c$id$orig_p;
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}
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if ( service_port in port_inactivity_timeouts )
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set_inactivity_timeout(c$id, port_inactivity_timeouts[service_port]);
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}
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