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我想在 CloudWatch 上创建一个指标过滤器和一个基于它的警报，以通知我有关 S3 事件的信息，特别是当文件或存储桶设置为公共时。这是我用来创建指标的指标过滤器：

{ ($.eventSource = s3.amazonaws.com) && (($.eventName = PutBucketAcl) || ($.eventName = PutObjectAcl)) && (($.requestParameters.AccessControlPolicy.AccessControlList.Grant.Grantee.type = Group) )}

我pattern通过输入以下内容对此进行了测试Custom log data：

{
    "Records": [
    {
        "eventVersion": "1.03",
        "userIdentity": {
            "type": "IAMUser",
            "principalId": "111122223333",
            "arn": "arn:aws:iam::111122223333:user/myUserName",
            "accountId": "111122223333",
            "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
            "userName": "myUserName"
        },
        "eventTime": "2015-08-26T20:46:31Z",
        "eventSource": "s3.amazonaws.com",
        "eventName": "DeleteBucketPolicy",
        "awsRegion": "us-west-2",
        "sourceIPAddress": "127.0.0.1",
        "userAgent": "[]",
        "requestParameters": {
            "bucketName": "myawsbucket"
        },
        "responseElements": null,
        "requestID": "47B8E8D397DCE7A6",
        "eventID": "cdc4b7ed-e171-4cef-975a-ad829d4123e8",
        "eventType": "AwsApiCall",
        "recipientAccountId": "111122223333"
    },
    {
       "eventVersion": "1.03",
       "userIdentity": {
            "type": "IAMUser",
            "principalId": "111122223333",
            "arn": "arn:aws:iam::111122223333:user/myUserName",
            "accountId": "111122223333",
            "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
            "userName": "myUserName"
        },
      "eventTime": "2015-08-26T20:46:31Z",
      "eventSource": "s3.amazonaws.com",
      "eventName": "PutBucketAcl",
      "awsRegion": "us-west-2",
      "sourceIPAddress": "",
      "userAgent": "[]",
      "requestParameters": {
          "bucketName": "",
          "AccessControlPolicy": {
              "AccessControlList": {
                  "Grant": {
                      "Grantee": {
                          "xsi:type": "Group",
                          "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
                          "ID": "d25639fbe9c19cd30a4c0f43fbf00e2d3f96400a9aa8dabfbbebe1906Example"
                       },
                      "Permission": "FULL_CONTROL"
                   }
              },
              "xmlns": "http://s3.amazonaws.com/doc/2006-03-01/",
              "Owner": {
                  "ID": "d25639fbe9c19cd30a4c0f43fbf00e2d3f96400a9aa8dabfbbebe1906Example"
              }
          }
      },
      "responseElements": null,
      "requestID": "BD8798EACDD16751",
      "eventID": "607b9532-1423-41c7-b048-ec2641693c47",
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    },
    {
      "eventVersion": "1.03",
      "userIdentity": {
          "type": "IAMUser",
          "principalId": "111122223333",
          "arn": "arn:aws:iam::111122223333:user/myUserName",
          "accountId": "111122223333",
          "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
          "userName": "myUserName"
        },
      "eventTime": "2015-08-26T20:46:31Z",
      "eventSource": "s3.amazonaws.com",
      "eventName": "GetBucketVersioning",
      "awsRegion": "us-west-2",
      "sourceIPAddress": "",
      "userAgent": "[]",
      "requestParameters": {
          "bucketName": "myawsbucket"
      },
      "responseElements": null,
      "requestID": "07D681279BD94AED",
      "eventID": "f2b287f3-0df1-4961-a2f4-c4bdfed47657",
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    }
  ]
}

我单击了测试模式并收到此消息：

结果在示例日志中的 50 个事件中找到 0 个匹配项。

是metric filter正确的吗？我应该有一个结果，但它没有出现。

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1 回答 1

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计算一个策略是否提供开放访问是相当复杂的，因为在桶策略中可以通过多种方式指定规则（例如，通配符可以提供访问）。

一种更简单的方法是在 Trusted Advisor中使用Amazon S3 存储桶权限检查：

检查 Amazon Simple Storage Service (Amazon S3) 中具有开放访问权限或允许访问任何经过身份验证的 AWS 用户的存储桶。

然后，您可以使用 Amazon CloudWatch Events 监控 Trusted Advisor 检查结果。

但是，该特定检查不包含在 Trusted Advisor 的免费套餐中。您需要参加支持计划才能进行该检查。

Amazon S3 控制台最近也进行了更新——它现在清楚地显示了任何具有公共权限的存储桶。

于 2017-11-14T11:08:40.973 回答