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[bugfix] support no-whitespace alert expressions in instance filtering #1

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[bugfix] support no-whitespace alert expressions in instance filtering #1

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29 changes: 25 additions & 4 deletions ...t-alerter/src/main/java/org/apache/hertzbeat/alert/calculate/RealTimeAlertCalculator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
import org.apache.hertzbeat.common.queue.CommonDataQueue;
import org.apache.hertzbeat.common.util.CommonUtil;
import org.apache.hertzbeat.common.util.JexlExpressionRunner;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

Expand Down Expand Up @@ -72,7 +73,7 @@ public class RealTimeAlertCalculator {
private static final Pattern APP_PATTERN = Pattern.compile("equals\\(__app__,\"([^\"]+)\"\\)");
private static final Pattern AVAILABLE_PATTERN = Pattern.compile("equals\\(__available__,\"([^\"]+)\"\\)");
private static final Pattern LABEL_PATTERN = Pattern.compile("contains\\(__labels__,\\s*\"([^\"]+)\"\\)");
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Regular Expression Pattern Vulnerability in Alert Expression Filtering

The regular expression pattern for matching instance expressions is too restrictive as it requires exactly one whitespace character (\s) between the comma and the opening quote. This causes the pattern to fail when there is no whitespace or multiple whitespace characters, leading to potential missed alerts. In a security context, this could result in failing to trigger alerts for critical security events if the alert definition doesn't match the expected format exactly.

Suggested change
private static final Pattern LABEL_PATTERN = Pattern.compile("contains\\(__labels__,\\s*\"([^\"]+)\"\\)");
private static final Pattern INSTANCE_PATTERN = Pattern.compile("equals\\(__instance__,\\s*\"(\\d+)\"\\)");

private static final Pattern INSTANCE_PATTERN = Pattern.compile("equals\\(__instance__,\\s\"(\\d+)\"\\)");
private static final Pattern INSTANCE_PATTERN = Pattern.compile("equals\\(__instance__,\\s*\"(\\d+)\"\\)");
private static final Pattern METRICS_PATTERN = Pattern.compile("equals\\(__metrics__,\"([^\"]+)\"\\)");

private final AlerterWorkerPool workerPool;
Expand All @@ -81,18 +82,38 @@ public class RealTimeAlertCalculator {
private final AlarmCommonReduce alarmCommonReduce;
private final AlarmCacheManager alarmCacheManager;

@Autowired
public RealTimeAlertCalculator(AlerterWorkerPool workerPool, CommonDataQueue dataQueue,
AlertDefineService alertDefineService, SingleAlertDao singleAlertDao,
AlarmCommonReduce alarmCommonReduce, AlarmCacheManager alarmCacheManager) {
this(workerPool, dataQueue, alertDefineService, singleAlertDao, alarmCommonReduce, alarmCacheManager, true);
}

/**
* Constructor for RealTimeAlertCalculator with a toggle to control whether to start alert calculation threads.
*
* @param workerPool The worker pool used for concurrent alert calculation.
* @param dataQueue The queue from which metric data is pulled and pushed.
* @param alertDefineService The service providing alert definition rules.
* @param singleAlertDao The DAO for fetching persisted alert states from storage.
* @param alarmCommonReduce The component responsible for reducing and sending alerts.
* @param start If true, the alert calculation threads will start automatically;
* set to false to disable thread start (useful for unit testing).
*/
public RealTimeAlertCalculator(AlerterWorkerPool workerPool, CommonDataQueue dataQueue,
AlertDefineService alertDefineService, SingleAlertDao singleAlertDao,
AlarmCommonReduce alarmCommonReduce, AlarmCacheManager alarmCacheManager, boolean start) {
this.workerPool = workerPool;
this.dataQueue = dataQueue;
this.alarmCommonReduce = alarmCommonReduce;
this.alertDefineService = alertDefineService;
this.alarmCacheManager = alarmCacheManager;
startCalculate();
if (start) {
startCalculate();
}
}

private void startCalculate() {
public void startCalculate() {
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medium

Consider if this method should be protected instead of public. Making it public exposes it unnecessarily, while protected would allow subclasses to override it if needed. If it's only used internally, it could also be private.

Suggested change
public void startCalculate() {
protected void startCalculate() {

Runnable runnable = () -> {
while (!Thread.currentThread().isInterrupted()) {
try {
Expand Down Expand Up @@ -252,7 +273,7 @@ private void calculate(CollectRep.MetricsData metricsData) {
* @param priority Current priority
* @return Filtered alert definitions
*/
private List<AlertDefine> filterThresholdsByAppAndMetrics(List<AlertDefine> thresholds, String app, String metrics, Map<String, String> labels, String instance, int priority) {
public List<AlertDefine> filterThresholdsByAppAndMetrics(List<AlertDefine> thresholds, String app, String metrics, Map<String, String> labels, String instance, int priority) {
return thresholds.stream()
.filter(define -> {
if (StringUtils.isBlank(define.getExpr())) {
Expand Down
83 changes: 83 additions & 0 deletions ...erter/src/test/java/org/apache/hertzbeat/alert/calculate/RealTimeAlertCalculatorTest.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,83 @@
package org.apache.hertzbeat.alert.calculate;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.hertzbeat.alert.AlerterWorkerPool;
import org.apache.hertzbeat.alert.dao.SingleAlertDao;
import org.apache.hertzbeat.alert.reduce.AlarmCommonReduce;
import org.apache.hertzbeat.alert.service.AlertDefineService;
import org.apache.hertzbeat.common.entity.alerter.AlertDefine;
import org.apache.hertzbeat.common.queue.CommonDataQueue;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;


class RealTimeAlertCalculatorTest {

private RealTimeAlertCalculator calculator;

@BeforeEach
void setUp() {
AlerterWorkerPool mockPool = Mockito.mock(AlerterWorkerPool.class);
CommonDataQueue mockQueue = Mockito.mock(CommonDataQueue.class);
AlertDefineService mockAlertDefineService = Mockito.mock(AlertDefineService.class);
SingleAlertDao mockDao = Mockito.mock(SingleAlertDao.class);
AlarmCommonReduce mockReduce = Mockito.mock(AlarmCommonReduce.class);
AlarmCacheManager alarmCacheManager = Mockito.mock(AlarmCacheManager.class);

Mockito.when(mockDao.querySingleAlertsByStatus(Mockito.anyString()))
.thenReturn(Collections.emptyList());

calculator = new RealTimeAlertCalculator(mockPool, mockQueue, mockAlertDefineService, mockDao, mockReduce, alarmCacheManager, false);
}

@Test
void testFilterThresholdsByAppAndMetrics_withInstanceExpr_HasSpace() {
String app = "redis";
String instanceId = "501045327364864";
int priority = 0;

AlertDefine matchDefine = new AlertDefine();
matchDefine.setExpr("equals(__app__,\"redis\") && equals(__instance__, \"501045327364864\")");

AlertDefine unmatchDefine = new AlertDefine();
unmatchDefine.setExpr("equals(__app__,\"redis\") && equals(__instance__, \"999999999\")");

List<AlertDefine> allDefines = Arrays.asList(matchDefine, unmatchDefine);

List<AlertDefine> filtered = calculator.filterThresholdsByAppAndMetrics(allDefines, app, "", Map.of(), instanceId, priority);

// It should filter out 999999999.
assertEquals(1, filtered.size());
assertEquals("equals(__app__,\"redis\") && equals(__instance__, \"501045327364864\")",
filtered.get(0).getExpr());
}

@Test
void testFilterThresholdsByAppAndMetrics_withInstanceExpr_NoSpace() {
String app = "redis";
String instanceId = "501045327364864";
int priority = 0;

AlertDefine matchDefine = new AlertDefine();
matchDefine.setExpr("equals(__app__,\"redis\") && equals(__instance__,\"501045327364864\")");

AlertDefine unmatchDefine = new AlertDefine();
unmatchDefine.setExpr("equals(__app__,\"redis\") && equals(__instance__,\"999999999\")");

List<AlertDefine> allDefines = Arrays.asList(matchDefine, unmatchDefine);

List<AlertDefine> filtered = calculator.filterThresholdsByAppAndMetrics(allDefines, app, "", Map.of(), instanceId, priority);

// It should filter out 999999999.
assertEquals(1, filtered.size());
assertEquals("equals(__app__,\"redis\") && equals(__instance__,\"501045327364864\")",
filtered.get(0).getExpr());
}
}