Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/438#discussion_r100379863
--- Diff:
metron-platform/metron-enrichment/src/main/java/org/apache/metron/threatintel/triage/ThreatTriageProcessor.java
---
@@ -52,15 +74,36 @@ public ThreatTriageProcessor( SensorEnrichmentConfig
config
@Nullable
@Override
- public Double apply(@Nullable Map input) {
- List<Number> scores = new ArrayList<>();
+ public ThreatScore apply(@Nullable Map input) {
+
+ ThreatScore threatScore = new ThreatScore();
StellarPredicateProcessor predicateProcessor = new
StellarPredicateProcessor();
+ StellarProcessor processor = new StellarProcessor();
VariableResolver resolver = new MapVariableResolver(input,
sensorConfig.getConfiguration(), threatIntelConfig.getConfig());
+
+ // attempt to apply each rule to the threat
for(RiskLevelRule rule : threatTriageConfig.getRiskLevelRules()) {
if(predicateProcessor.parse(rule.getRule(), resolver,
functionResolver, context)) {
- scores.add(rule.getScore());
+
+ // add the rule's score to the overall threat score
+ String reason = execute(rule.getReason(), processor, resolver,
String.class);
+ RuleScore score = new RuleScore(rule, reason);
+ threatScore.addRuleScore(score);
}
}
- return threatTriageConfig.getAggregator().aggregate(scores,
threatTriageConfig.getAggregationConfig());
+
+ // calculate the aggregate threat score
+ Aggregators aggregators = threatTriageConfig.getAggregator();
+ List<Number> allScores =
threatScore.getRuleScores().stream().map(score ->
score.getRule().getScore()).collect(Collectors.toList());
+ Double aggregateScore = aggregators.aggregate(allScores,
threatTriageConfig.getAggregationConfig());
+
+ // return the overall threat score
+ threatScore.setScore(aggregateScore);
+ return threatScore;
+ }
+
+ private <T> T execute(String expression, StellarProcessor processor,
VariableResolver resolver, Class<T> clazz) {
+ Object result = processor.parse(expression, resolver,
functionResolver, context);
--- End diff --
This gets called to execute the 'reason' Stellar expression that is part of
a threat triage rule. It is only called on the rules that are 'fired' (rule
predicate is true) for a particular message (line 89).
A rule's 'reason' is something that could be changed by the user at any
time. I am unsure of a better way to do it. Thoughts?
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