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S3に格納されたAWS WAFログをSNSで通知する（Lambda, Node.js)
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| const aws = require("aws-sdk"); | |
| const s3 = new aws.S3(); | |
| var sns = new aws.SNS({region: 'ap-northeast-1'}); | |
| var zlib = require('zlib'); | |
| exports.handler = (event, context, callback) => { | |
| const params = { | |
| Bucket: "aws-waf-logs-corporate-s3", | |
| Key: event.Records[0].s3.object.key | |
| }; | |
| s3.getObject(params, (err, getData) => { | |
| if (err) { | |
| callback(err); | |
| return; | |
| } | |
| const body = getData.Body; | |
| zlib.gunzip(body, (err, data) => { | |
| if (err) { | |
| callback(err); | |
| return; | |
| } | |
| // 解凍したデータ | |
| const stringData = data.toString("utf-8"); | |
| // 分割 | |
| const logs = stringData.split('\n'); | |
| // Blockログのみフィルタリング | |
| var blockLogs = logs.filter(function (evt) { | |
| return evt.match(/BLOCK/); | |
| }).filter(function (evt) { | |
| return !evt.match(/$^/); | |
| }).map(function (evt) { | |
| return evt; | |
| }); | |
| if(blockLogs.length == 0){ | |
| callback(); | |
| return; | |
| } | |
| const subject = 'Notify From AWS WAF Logs'; | |
| let payload = {default: ''}; | |
| for(const logIndex in blockLogs) { | |
| const log = JSON.parse(blockLogs[logIndex]); | |
| payload['default'] += log.terminatingRuleId; | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.clientIp; | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.country; | |
| payload['default'] += '|'; | |
| for (const header in log.httpRequest.headers) { | |
| if (log.httpRequest.headers[header].name == 'Host') { | |
| payload['default'] += log.httpRequest.headers[header].value; | |
| } | |
| } | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.uri; | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.httpMethod; | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.args; | |
| payload['default'] += '|'; | |
| payload['default'] += log.httpRequest.httpVersion; | |
| payload['default'] += '\n'; | |
| for (const header in log.httpRequest.headers) { | |
| if (log.httpRequest.headers[header].name == 'User-Agent') { | |
| payload['default'] += log.httpRequest.headers[header].value; | |
| } | |
| } | |
| payload['default'] += '|'; | |
| payload['default'] += log.action; | |
| payload['default'] += '\n'; | |
| payload['default'] += '---'; | |
| payload['default'] += '\n'; | |
| } | |
| sns.publish({ | |
| Subject: subject, | |
| Message: JSON.stringify(payload), | |
| MessageStructure: 'json', | |
| TargetArn: 'arn:aws:sns:ap-northeast-1:999999999999:EXAMPLE_Topic' | |
| }, function (err, data) { | |
| if (err) callback(err); | |
| else callback(null, data); | |
| }); | |
| callback(null); | |
| }); | |
| }); | |
| }; |
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