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cw-waf-dashboard-cloudfront-logguery.yaml
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cw-waf-dashboard-cloudfront-logguery.yaml
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AWSTemplateFormatVersion: "2010-09-09"
Description: CloudWatch Dashboard for AWS WAF
Parameters:
WebACLName:
Description: Web ACL Name
Type: String
WAFRegion:
Description: WAF Region (Select 'us-east-1' for CloudFront)
Type: String
Default: us-east-1
CWWAFLogName:
Description: CloudWatch Log Name
Type: String
Resources:
lambdaFunction:
Type: AWS::Lambda::Function
Properties:
Code:
ZipFile: |
const aws = require('aws-sdk');
const CHECK_QUERY_STATUS_DELAY_MS = 250;
const CSS = '<style>td { white-space: nowrap; }</style>'
const ORIGINAL_QUERY = 'fields @timestamp, @message | sort @timestamp desc | limit 20';
const DOCS = `
## Run Logs Insights Query
Runs a Logs Insights query and displays results in a table.
### Widget parameters
Param | Description
---|---
**logGroups** | The log groups (comma-separated) to run query against
**query** | The query to run
**region** | The region to run the query in
### Example parameters
\`\`\` yaml
logGroups: ${process.env.AWS_LAMBDA_LOG_GROUP_NAME}
query: '${ORIGINAL_QUERY}'
region: ${process.env.AWS_REGION}
\`\`\`
`;
const runQuery = async (logsClient, logGroups, queryString, startTime, endTime) => {
const startQuery = await logsClient.startQuery({
logGroupNames: logGroups.replace(/\s/g, '').split(','),
queryString,
startTime,
endTime
}).promise();
const queryId = startQuery.queryId;
while (true) {
const queryResults = await logsClient.getQueryResults({ queryId }).promise();
if (queryResults.status !== 'Complete') {
await sleep(CHECK_QUERY_STATUS_DELAY_MS); // Sleep before calling again
} else {
return queryResults.results;
}
}
};
const sleep = async (delay) => {
return new Promise((resolve) => setTimeout(resolve, delay));
};
const displayResults = async (logGroups, query, results, context) => {
let html = `
<form><table>
<tr>
<td>Log Groups</td><td><input name="logGroups" value="${logGroups}" size="100"></td>
</tr><tr>
<td valign=top>Query</td><td><textarea name="query" rows="2" cols="80">${query}</textarea></td>
</tr>
</table></form>
<a class="btn btn-primary">Run query</a>
<cwdb-action action="call" endpoint="${context.invokedFunctionArn}"></cwdb-action>
<a class="btn">Reset to original query</a>
<cwdb-action action="call" endpoint="${context.invokedFunctionArn}">
{ "resetQuery": true }
</cwdb-action>
<p>
<h2>Results</h2>
`;
const stripPtr = result => result.filter(entry => entry.field !== '@ptr');
if (results && results.length > 0) {
const cols = stripPtr(results[0]).map(entry => entry.field);
html += `<table><thead><tr><th>${cols.join('</th><th>')}</th></tr></thead><tbody>`;
results.forEach(row => {
const vals = stripPtr(row).map(entry => entry.value);
html += `<tr><td>${vals.join('</td><td>')}</td></tr>`;
});
html += `</tbody></table>`
} else {
html += `<pre>${JSON.stringify(results, null, 4)}</pre>`;
}
return html;
};
exports.handler = async (event, context) => {
if (event.describe) {
return DOCS;
}
const widgetContext = event.widgetContext;
const form = widgetContext.forms.all;
const logGroups = form.logGroups || event.logGroups;
const region = widgetContext.params.region || event.region || process.env.AWS_REGION;
const timeRange = widgetContext.timeRange.zoom || widgetContext.timeRange;
const logsClient = new aws.CloudWatchLogs({ region });
const resetQuery = event.resetQuery;
let query = form.query || event.query;
if (resetQuery) {
query = widgetContext.params.query || ORIGINAL_QUERY;
}
let results;
if (query && query.trim() !== '') {
try {
results = await runQuery(logsClient, logGroups, query, timeRange.start, timeRange.end);
} catch (e) {
results = e;
}
}
return CSS + await displayResults(logGroups, query, results, context);
};
Description: "CloudWatch Custom Widget sample: display results of CloudWatch Logs insights queries"
FunctionName: !Sub ${AWS::StackName}
Handler: index.handler
MemorySize: 128
Role: !GetAtt lambdaIAMRole.Arn
Runtime: nodejs16.x
Timeout: 60
Tags:
- Key: cw-custom-widget
Value: describe:readOnly
lambdaIAMRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Action:
- sts:AssumeRole
Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Policies:
- PolicyDocument:
Version: 2012-10-17
Statement:
- Action:
- logs:CreateLogGroup
- logs:CreateLogStream
- logs:PutLogEvents
Effect: Allow
Resource:
- !Sub arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${AWS::StackName}:*
PolicyName: lambda
- PolicyDocument:
Version: 2012-10-17
Statement:
- Action:
- logs:StartQuery
- logs:GetQueryResults
Effect: Allow
Resource:
- "*"
PolicyName: cloudwatchRunsLogsInsightsQueries
lambdaLogGroup:
Type: AWS::Logs::LogGroup
Properties:
LogGroupName: !Sub /aws/lambda/${AWS::StackName}
RetentionInDays: 7
DashboardSideBySide:
Type: AWS::CloudWatch::Dashboard
Properties:
DashboardName: !Sub "${AWS::StackName}"
DashboardBody: !Sub |
{
"widgets": [
{
"type": "metric",
"height": 6,
"width": 6,
"x": 0,
"y": 0,
"properties": {
"metrics": [
[ "AWS/WAFV2", "AllowedRequests", "WebACL", "${WebACLName}", "Rule", "ALL", { "id": "m1" } ],
[ ".", "BlockedRequests", ".", ".", ".", ".", { "id": "m2" } ]
],
"view": "timeSeries",
"stacked": true,
"region": "${WAFRegion}",
"stat": "Sum",
"title": "Allowed vs Blocked Requests",
"period": 300,
"yAxis": {
"left": {
"showUnits": false
}
}
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 6,
"y": 6,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields httpRequest.clientIp\n| stats count(*) as requestCount by httpRequest.country\n| sort requestCount desc\n| limit 100",
"region": "${WAFRegion}",
"title": "Top Countries",
"view": "pie"
}
},
{
"type": "metric",
"height": 6,
"width": 6,
"x": 12,
"y": 0,
"properties": {
"metrics": [
[ { "id": "e1", "expression": "SEARCH('{AWS/WAFV2,Rule,WebACL} MetricName=\"AllowedRequests\" WebACL=\"${WebACLName}\" Rule=\"ALL\"', 'Sum', 300)", "stat": "Sum", "period": 300, "visible": false } ],
[ { "id": "e2", "expression": "SEARCH('{AWS/WAFV2,Rule,WebACL} MetricName=\"BlockedRequests\" WebACL=\"${WebACLName}\" Rule=\"ALL\"', 'Sum', 300)", "stat": "Sum", "period": 300, "visible": false } ],
[ { "id": "e3", "expression": "SEARCH('{AWS/WAFV2,LabelName,LabelNamespace,WebACL} MetricName=\"AllowedRequests\" LabelNamespace=\"awswaf:managed:aws:bot-control:bot:category\" WebACL=\"${WebACLName}\"', 'Sum', 300)", "period": 300, "visible": false } ],
[ { "id": "e4", "expression": "SEARCH('{AWS/WAFV2,LabelName,LabelNamespace,WebACL} MetricName=\"BlockedRequests\" LabelNamespace=\"awswaf:managed:aws:bot-control:bot:category\" WebACL=\"${WebACLName}\"', 'Sum', 300)", "period": 300, "visible": false } ],
[ { "id": "e5", "expression": "SUM([e3,e4])", "label": "Bot requests", "color": "#FF7F0E" } ],
[ { "id": "e6", "expression": "SUM([e1,e2,-e3,-e4])", "label": "Non-bot requests", "color": "#1F77B4" } ]
],
"view": "timeSeries",
"stacked": true,
"region": "${WAFRegion}",
"stat": "Average",
"title": "Bot requests vs Non-bot requests",
"period": 300,
"liveData": false,
"yAxis": {
"left": {
"showUnits": false,
"min": 0
}
}
}
},
{
"type": "metric",
"height": 6,
"width": 6,
"x": 18,
"y": 0,
"properties": {
"metrics": [
[ { "id": "e1", "expression": "SEARCH('{AWS/WAFV2,Rule,WebACL} MetricName=\"AllowedRequests\" WebACL=\"${WebACLName}\" Rule=\"ALL\"', 'Sum', 300)", "stat": "Sum", "period": 300, "visible": false } ],
[ { "id": "e2", "expression": "SEARCH('{AWS/WAFV2,Rule,WebACL} MetricName=\"BlockedRequests\" WebACL=\"${WebACLName}\" Rule=\"ALL\"', 'Sum', 300)", "stat": "Sum", "period": 300, "visible": false } ],
[ { "id": "e3", "expression": "SEARCH('{AWS/WAFV2,LabelName,LabelNamespace,WebACL} MetricName=\"AllowedRequests\" LabelNamespace=\"awswaf:managed:aws:bot-control:bot:category\" WebACL=\"${WebACLName}\"', 'Sum', 300)", "period": 300, "visible": false } ],
[ { "id": "e4", "expression": "SEARCH('{AWS/WAFV2,LabelName,LabelNamespace,WebACL} MetricName=\"BlockedRequests\" LabelNamespace=\"awswaf:managed:aws:bot-control:bot:category\" WebACL=\"${WebACLName}\"', 'Sum', 300)", "period": 300, "visible": false } ],
[ { "id": "e5", "expression": "SUM([e1,e2,-e3,-e4])", "period": 300, "visible": false } ],
[ { "id": "e6", "expression": "(SUM([e3,e4]) / SUM([e1,e2])) * 100", "period": 300, "label": "Bot requests", "color": "#FF7F0E" } ],
[ { "id": "e7", "expression": "(e5 / SUM([e1,e2])) * 100", "period": 300, "label": "Non-bot requests", "color": "#1F77B4" } ]
],
"view": "singleValue",
"region": "${WAFRegion}",
"stat": "Average",
"title": "Percentage of Bot requests",
"period": 300,
"liveData": false,
"setPeriodToTimeRange": true
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 12,
"y": 12,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| filter @message like \"COUNT\"\n| sort @timestamp desc\n| parse @message '\"nonTerminatingMatchingRules\":[{*}]' as nonTerminatingMatchingRules\n| parse @message '\"excludedRules\":[{*}]' as excludedRules\n| display @timestamp, httpRequest.clientIp,httpRequest.uri, httpRequest.country, excludedRules, nonTerminatingMatchingRules\n| limit 100",
"region": "${WAFRegion}",
"title": "Counted Requests",
"view": "table"
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 18,
"y": 6,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| filter terminatingRuleType =\"RATE_BASED\" \n| sort @timestamp desc\n| display @timestamp, httpRequest.clientIp,httpRequest.uri, httpRequest.country, terminatingRuleId\n| limit 100",
"region": "${WAFRegion}",
"title": " Blocked requests by Rate based rule",
"view": "table"
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 0,
"y": 6,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields terminatingRuleId\n| stats count(*) as requestCount by terminatingRuleId\n| sort requestCount desc\n| limit 100",
"region": "${WAFRegion}",
"title": "Top Terminating Rules",
"view": "pie"
}
},
{
"type": "metric",
"height": 6,
"width": 6,
"x": 6,
"y": 0,
"properties": {
"metrics": [
[ "AWS/WAFV2", "CountedRequests", "WebACL", "${WebACLName}", "Rule", "ALL" ]
],
"view": "timeSeries",
"stacked": true,
"region": "${WAFRegion}",
"stat": "Sum",
"title": "All Counted Requests",
"period": 300,
"yAxis": {
"left": {
"showUnits": false
}
}
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 18,
"y": 12,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| filter @message like /\"action\":\"BLOCK\"/\n| sort @timestamp desc\n| display @timestamp, httpRequest.clientIp,httpRequest.uri, httpRequest.country, terminatingRuleId\n| limit 100",
"region": "${WAFRegion}",
"title": "Blocked Requests",
"view": "table"
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 6,
"y": 12,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| filter @message like /\"action\":\"BLOCK\"/\n| stats count(*) as requestCount by httpRequest.uri\n| sort requestCount desc\n| limit 100",
"region": "${WAFRegion}",
"title": "Top Blocked URIs",
"view": "table"
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 0,
"y": 12,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| filter @message like \"COUNT\"\n| stats count(*) as requestCount by httpRequest.uri\n| sort requestCount desc\n| limit 100",
"region": "${WAFRegion}",
"title": "Top Counted URIs",
"view": "table"
}
},
{
"type": "log",
"height": 6,
"width": 6,
"x": 12,
"y": 6,
"properties": {
"query": "SOURCE '${CWWAFLogName}' | fields @timestamp, @message\n| parse @message /\\{\"name\":\"[Uu]ser\\-[Aa]gent\\\",\\\"value\\\"\\:\\\"(?<UserAgent>[^\"}]*)/\n| stats count(*) as requestCount by UserAgent\n| sort requestCount desc\n| limit 100",
"region": "${WAFRegion}",
"title": "Top User-agents",
"view": "table"
}
},
{
"type": "custom",
"height": 10,
"width": 24,
"properties": {
"endpoint": "${lambdaFunction.Arn}",
"params": {
"region": "${WAFRegion}",
"logGroups": "${CWWAFLogName}",
"query": "fields @timestamp, @message | sort @timestamp desc | limit 20"
},
"title": "Logs Insights Query, ${WAFRegion}"
}
}
]
}
Outputs:
Dashboard:
Description: "Dashboard created to monitor AWS WAF"
Value: !Sub |
"https://${AWS::Region}.console.aws.amazon.com/cloudwatch/home#dashboards:name=${AWS::StackName}"