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Creates bucket level monitors for rules containing aggregations (open…
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…search-project#92)

Signed-off-by: Stevan Buzejic <stevan.buzejic@htecgroup.com>
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@stevanbz
stevanbz committed Nov 9, 2022
1 parent ee7f6fb commit 2f0abe6
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Showing 15 changed files with 1,133 additions and 106 deletions.
36 changes: 33 additions & 3 deletions src/main/java/org/opensearch/securityanalytics/model/Detector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,8 @@
*/
package org.opensearch.securityanalytics.model;

import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.opensearch.common.ParseField;
Expand Down Expand Up @@ -49,6 +51,8 @@ public class Detector implements Writeable, ToXContentObject {
public static final String LAST_UPDATE_TIME_FIELD = "last_update_time";
public static final String ENABLED_TIME_FIELD = "enabled_time";
public static final String ALERTING_MONITOR_ID = "monitor_id";

public static final String BUCKET_MONITOR_ID_RULE_ID = "bucket_monitor_id_rule_id";
private static final String RULE_TOPIC_INDEX = "rule_topic_index";

private static final String ALERTS_INDEX = "alert_index";
Expand All @@ -59,6 +63,9 @@ public class Detector implements Writeable, ToXContentObject {

public static final String DETECTORS_INDEX = ".opensearch-sap-detectors-config";

// Used as a key in rule-monitor map for the purpose of easy detection of the doc level monitor
public static final String DOC_LEVEL_MONITOR = "-1";

public static final NamedXContentRegistry.Entry XCONTENT_REGISTRY = new NamedXContentRegistry.Entry(
Detector.class,
new ParseField(DETECTOR_TYPE),
Expand Down Expand Up @@ -90,6 +97,8 @@ public class Detector implements Writeable, ToXContentObject {

private List<String> monitorIds;

private Map<String, String> ruleIdMonitorIdMap;

private String ruleIndex;

private String alertsIndex;
Expand All @@ -108,7 +117,7 @@ public Detector(String id, Long version, String name, Boolean enabled, Schedule
Instant lastUpdateTime, Instant enabledTime, DetectorType detectorType,
User user, List<DetectorInput> inputs, List<DetectorTrigger> triggers, List<String> monitorIds,
String ruleIndex, String alertsIndex, String alertsHistoryIndex, String alertsHistoryIndexPattern,
String findingsIndex, String findingsIndexPattern) {
String findingsIndex, String findingsIndexPattern, Map<String, String> rulePerMonitor) {
this.type = DETECTOR_TYPE;

this.id = id != null ? id : NO_ID;
Expand All @@ -129,6 +138,7 @@ public Detector(String id, Long version, String name, Boolean enabled, Schedule
this.alertsHistoryIndexPattern = alertsHistoryIndexPattern;
this.findingsIndex = findingsIndex;
this.findingsIndexPattern = findingsIndexPattern;
this.ruleIdMonitorIdMap = rulePerMonitor;

if (enabled) {
Objects.requireNonNull(enabledTime);
Expand All @@ -154,7 +164,9 @@ public Detector(StreamInput sin) throws IOException {
sin.readString(),
sin.readString(),
sin.readString(),
sin.readString());
sin.readString(),
sin.readMap(StreamInput::readString, StreamInput::readString)
);
}

@Override
Expand Down Expand Up @@ -186,6 +198,8 @@ public void writeTo(StreamOutput out) throws IOException {
}
out.writeStringCollection(monitorIds);
out.writeString(ruleIndex);

out.writeMap(ruleIdMonitorIdMap, StreamOutput::writeString, StreamOutput::writeString);
}

public XContentBuilder toXContentWithUser(XContentBuilder builder, Params params) throws IOException {
Expand Down Expand Up @@ -269,6 +283,7 @@ private XContentBuilder createXContentBuilder(XContentBuilder builder, ToXConten
}

builder.field(ALERTING_MONITOR_ID, monitorIds);
builder.field(BUCKET_MONITOR_ID_RULE_ID, ruleIdMonitorIdMap);
builder.field(RULE_TOPIC_INDEX, ruleIndex);
builder.field(ALERTS_INDEX, alertsIndex);
builder.field(ALERTS_HISTORY_INDEX, alertsHistoryIndex);
Expand Down Expand Up @@ -313,6 +328,8 @@ public static Detector parse(XContentParser xcp, String id, Long version) throws
List<DetectorInput> inputs = new ArrayList<>();
List<DetectorTrigger> triggers = new ArrayList<>();
List<String> monitorIds = new ArrayList<>();
Map<String, String> rulePerMonitor = new HashMap<>();

String ruleIndex = null;
String alertsIndex = null;
String alertsHistoryIndex = null;
Expand Down Expand Up @@ -391,6 +408,9 @@ public static Detector parse(XContentParser xcp, String id, Long version) throws
monitorIds.add(monitorId);
}
break;
case BUCKET_MONITOR_ID_RULE_ID:
rulePerMonitor= xcp.mapStrings();
break;
case RULE_TOPIC_INDEX:
ruleIndex = xcp.text();
break;
Expand Down Expand Up @@ -438,7 +458,8 @@ public static Detector parse(XContentParser xcp, String id, Long version) throws
alertsHistoryIndex,
alertsHistoryIndexPattern,
findingsIndex,
findingsIndexPattern);
findingsIndexPattern,
rulePerMonitor);
}

public static Detector readFrom(StreamInput sin) throws IOException {
Expand Down Expand Up @@ -521,6 +542,8 @@ public void setUser(User user) {
this.user = user;
}

public Map<String, String> getRuleIdMonitorIdMap() {return ruleIdMonitorIdMap; }

public void setId(String id) {
this.id = id;
}
Expand Down Expand Up @@ -568,6 +591,13 @@ public void setInputs(List<DetectorInput> inputs) {
public void setMonitorIds(List<String> monitorIds) {
this.monitorIds = monitorIds;
}
public void setRuleIdMonitorIdMap(Map<String, String> ruleIdMonitorIdMap) {
this.ruleIdMonitorIdMap = ruleIdMonitorIdMap;
}

public String getDocLevelMonitorId() {
return ruleIdMonitorIdMap.get(DOC_LEVEL_MONITOR);
}

@Override
public boolean equals(Object o) {
Expand Down
55 changes: 49 additions & 6 deletions src/main/java/org/opensearch/securityanalytics/model/Rule.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
*/
package org.opensearch.securityanalytics.model;

import org.apache.commons.lang3.tuple.Pair;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.opensearch.common.ParseField;
Expand All @@ -16,6 +17,11 @@
import org.opensearch.common.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentParser;
import org.opensearch.common.xcontent.XContentParserUtils;
import org.opensearch.securityanalytics.rules.aggregation.AggregationItem;
import org.opensearch.securityanalytics.rules.backend.OSQueryBackend.AggregationQueries;
import org.opensearch.securityanalytics.rules.condition.ConditionItem;
import org.opensearch.securityanalytics.rules.exceptions.SigmaError;
import org.opensearch.securityanalytics.rules.objects.SigmaCondition;
import org.opensearch.securityanalytics.rules.objects.SigmaRule;

import java.io.IOException;
Expand Down Expand Up @@ -56,6 +62,7 @@ public class Rule implements Writeable, ToXContentObject {

public static final String PRE_PACKAGED_RULES_INDEX = ".opensearch-sap-pre-packaged-rules-config";
public static final String CUSTOM_RULES_INDEX = ".opensearch-sap-custom-rules-config";
public static final String AGGREGATION_QUERIES = "aggregationQueries";

public static final NamedXContentRegistry.Entry XCONTENT_REGISTRY = new NamedXContentRegistry.Entry(
Rule.class,
Expand Down Expand Up @@ -95,10 +102,12 @@ public class Rule implements Writeable, ToXContentObject {

private String rule;

private List<Value> aggregationQueries;

public Rule(String id, Long version, String title, String category, String logSource,
String description, List<Value> references, List<Value> tags, String level,
List<Value> falsePositives, String author, String status, Instant date,
List<Value> queries, List<Value> queryFieldNames, String rule) {
List<Value> queries, List<Value> queryFieldNames, String rule, List<Value> aggregationQueries) {
this.id = id != null? id: NO_ID;
this.version = version != null? version: NO_VERSION;

Expand All @@ -121,10 +130,11 @@ public Rule(String id, Long version, String title, String category, String logSo
this.queries = queries;
this.queryFieldNames = queryFieldNames;
this.rule = rule;
this.aggregationQueries = aggregationQueries;
}

public Rule(String id, Long version, SigmaRule rule, String category,
List<String> queries, List<String> queryFieldNames, String original) {
List<Object> queries, List<String> queryFieldNames, String original) {
this(
id,
version,
Expand All @@ -141,9 +151,11 @@ public Rule(String id, Long version, SigmaRule rule, String category,
rule.getAuthor(),
rule.getStatus().toString(),
Instant.ofEpochMilli(rule.getDate().getTime()),
queries.stream().map(Value::new).collect(Collectors.toList()),
queries.stream().filter(query -> !(query instanceof AggregationQueries)).map(query -> new Value(query.toString())).collect(Collectors.toList()),
queryFieldNames.stream().map(Value::new).collect(Collectors.toList()),
original);
original,
// If one of the queries is AggregationQuery -> the whole rule can be considered as Agg
queries.stream().filter(query -> query instanceof AggregationQueries).map(it -> new Value(it.toString())).collect(Collectors.toList()));
}

public Rule(StreamInput sin) throws IOException {
Expand All @@ -163,7 +175,9 @@ public Rule(StreamInput sin) throws IOException {
sin.readInstant(),
sin.readList(Value::readFrom),
sin.readList(Value::readFrom),
sin.readString());
sin.readString(),
sin.readList(Value::readFrom)
);
}

@Override
Expand All @@ -190,6 +204,7 @@ public void writeTo(StreamOutput out) throws IOException {
out.writeCollection(queryFieldNames);

out.writeString(rule);
out.writeCollection(aggregationQueries);
}

@Override
Expand Down Expand Up @@ -233,6 +248,10 @@ private XContentBuilder createXContentBuilder(XContentBuilder builder, ToXConten
queryFieldNamesArray = queryFieldNames.toArray(queryFieldNamesArray);
builder.field(QUERY_FIELD_NAMES, queryFieldNamesArray);

Value[] aggregationsArray = new Value[]{};
aggregationsArray = aggregationQueries.toArray(aggregationsArray);
builder.field(AGGREGATION_QUERIES, aggregationsArray);

builder.field(RULE, rule);
if (params.paramAsBoolean("with_type", false)) {
builder.endObject();
Expand Down Expand Up @@ -278,6 +297,7 @@ public static Rule parse(XContentParser xcp, String id, Long version) throws IOE
List<Value> queries = new ArrayList<>();
List<Value> queryFields = new ArrayList<>();
String original = null;
List<Value> aggregationQueries = new ArrayList<>();

XContentParserUtils.ensureExpectedToken(XContentParser.Token.START_OBJECT, xcp.currentToken(), xcp);
while (xcp.nextToken() != XContentParser.Token.END_OBJECT) {
Expand Down Expand Up @@ -342,6 +362,11 @@ public static Rule parse(XContentParser xcp, String id, Long version) throws IOE
case RULE:
original = xcp.text();
break;
case AGGREGATION_QUERIES:
XContentParserUtils.ensureExpectedToken(XContentParser.Token.START_ARRAY, xcp.currentToken(), xcp);
while (xcp.nextToken() != XContentParser.Token.END_ARRAY) {
aggregationQueries.add(Value.parse(xcp));
}
default:
xcp.skipChildren();
}
Expand All @@ -363,7 +388,8 @@ public static Rule parse(XContentParser xcp, String id, Long version) throws IOE
date,
queries,
queryFields,
Objects.requireNonNull(original, "Rule String is null")
Objects.requireNonNull(original, "Rule String is null"),
aggregationQueries
);
}

Expand Down Expand Up @@ -442,4 +468,21 @@ public List<Value> getQueries() {
public List<Value> getQueryFieldNames() {
return queryFieldNames;
}

public List<Value> getAggregationQueries() { return aggregationQueries; }

public boolean isAggregationRule() {
return aggregationQueries != null && !aggregationQueries.isEmpty();
}

public List<AggregationItem> getAggregationItemsFromRule () throws SigmaError {
SigmaRule sigmaRule = SigmaRule.fromYaml(rule, true);
List<AggregationItem> aggregationItems = new ArrayList<>();
for (SigmaCondition condition: sigmaRule.getDetection().getParsedCondition()) {
Pair<ConditionItem, AggregationItem> parsedItems = condition.parsed();
AggregationItem aggItem = parsedItems.getRight();
aggregationItems.add(aggItem);
}
return aggregationItems;
}
}
56 changes: 56 additions & 0 deletions src/main/java/org/opensearch/securityanalytics/rules/backend/AggregationBuilders.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,56 @@
/*
* Copyright OpenSearch Contributors
* SPDX-License-Identifier: Apache-2.0
*/
package org.opensearch.securityanalytics.rules.backend;

import java.util.Locale;
import org.apache.commons.lang3.NotImplementedException;
import org.opensearch.search.aggregations.AggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.opensearch.search.aggregations.metrics.AvgAggregationBuilder;
import org.opensearch.search.aggregations.metrics.MaxAggregationBuilder;
import org.opensearch.search.aggregations.metrics.MedianAbsoluteDeviationAggregationBuilder;
import org.opensearch.search.aggregations.metrics.MinAggregationBuilder;
import org.opensearch.search.aggregations.metrics.SumAggregationBuilder;
import org.opensearch.search.aggregations.metrics.ValueCountAggregationBuilder;

public final class AggregationBuilders {

/**
* Finds the builder aggregation based on the forwarded function
*
* @param aggregationFunction Aggregation function
* @param name Name of the aggregation
* @return Aggregation builder
*/
public static AggregationBuilder getAggregationBuilderByFunction(String aggregationFunction, String name) {
AggregationBuilder aggregationBuilder;
switch (aggregationFunction.toLowerCase(Locale.ROOT)) {
case AvgAggregationBuilder.NAME:
aggregationBuilder = new AvgAggregationBuilder(name).field(name);
break;
case MaxAggregationBuilder.NAME:
aggregationBuilder = new MaxAggregationBuilder(name).field(name);
break;
case MedianAbsoluteDeviationAggregationBuilder.NAME:
aggregationBuilder = new MedianAbsoluteDeviationAggregationBuilder(name).field(name);
break;
case MinAggregationBuilder.NAME:
aggregationBuilder = new MinAggregationBuilder(name).field(name);
break;
case SumAggregationBuilder.NAME:
aggregationBuilder = new SumAggregationBuilder(name).field(name);
break;
case TermsAggregationBuilder.NAME:
aggregationBuilder = new TermsAggregationBuilder(name).field(name);
break;
case "count":
aggregationBuilder = new ValueCountAggregationBuilder(name).field(name);
break;
default:
throw new NotImplementedException(String.format(Locale.getDefault(), "Aggregation %s not supported by the backend", aggregationFunction));
}
return aggregationBuilder;
}
}
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