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6183c5086b
This is the first phase of moving from the current dpd log to a more modern logfile, without some of the weirdnesses that the current dpd log contains. Tests will not pass in the current state; this is just splitting out functionality.
99 lines
3 KiB
Text
99 lines
3 KiB
Text
##! Disables analyzers if protocol violations occur.
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module DPD;
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export {
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## Deprecated, please see https://github.com/zeek/zeek/pull/4200 for details
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option max_violations: table[Analyzer::Tag] of count = table() &deprecated="Remove in v8.1: This has become non-functional in Zeek 7.2, see PR #4200" &default = 5;
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## Analyzers which you don't want to throw
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option ignore_violations: set[Analyzer::Tag] = set();
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## Ignore violations which go this many bytes into the connection.
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## Set to 0 to never ignore protocol violations.
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option ignore_violations_after = 10 * 1024;
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## Change behavior of service field in conn.log:
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## Failed services are no longer removed. Instead, for a failed
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## service, a second entry with a "-" in front of it is added.
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## E.g. a http connection with a violation would be logged as
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## "http,-http".
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option track_removed_services_in_connection = F;
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}
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redef record connection += {
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## The set of services (analyzers) for which Zeek has observed a
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## violation after the same service had previously been confirmed.
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service_violation: set[string] &default=set() &ordered;
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};
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event analyzer_confirmation_info(atype: AllAnalyzers::Tag, info: AnalyzerConfirmationInfo) &priority=10
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{
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if ( ! is_protocol_analyzer(atype) && ! is_packet_analyzer(atype) )
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return;
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if ( ! info?$c )
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return;
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local c = info$c;
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local analyzer = Analyzer::name(atype);
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add c$service[analyzer];
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}
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event analyzer_violation_info(atype: AllAnalyzers::Tag, info: AnalyzerViolationInfo) &priority=10
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{
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if ( ! is_protocol_analyzer(atype) && ! is_packet_analyzer(atype) )
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return;
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if ( ! info?$c )
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return;
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local c = info$c;
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local analyzer = Analyzer::name(atype);
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# If the service hasn't been confirmed yet, or already failed,
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# don't generate a log message for the protocol violation.
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if ( analyzer !in c$service )
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return;
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# If removed service tracking is active, don't delete the service here.
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if ( ! track_removed_services_in_connection )
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delete c$service[analyzer];
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# if statement is separate, to allow repeated removal of service, in case there are several
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# confirmation and violation events
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if ( analyzer in c$service_violation )
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return;
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add c$service_violation[analyzer];
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}
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event analyzer_violation_info(atype: AllAnalyzers::Tag, info: AnalyzerViolationInfo ) &priority=5
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{
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if ( ! is_protocol_analyzer(atype) && ! is_packet_analyzer(atype) )
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return;
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if ( ! info?$c || ! info?$aid )
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return;
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if ( atype in ignore_violations )
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return;
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local c = info$c;
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local aid = info$aid;
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local size = c$orig$size + c$resp$size;
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if ( ignore_violations_after > 0 && size > ignore_violations_after )
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return;
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local disabled = disable_analyzer(c$id, aid, F);
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# add "-service" to the list of services on removal due to violation, if analyzer was confirmed before
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if ( track_removed_services_in_connection && disabled && Analyzer::name(atype) in c$service )
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{
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local rname = cat("-", Analyzer::name(atype));
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if ( rname !in c$service )
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add c$service[rname];
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}
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}
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