未知錯誤，沒有消息，CF 模板在邏輯上不適用於我的自動 s3 存儲桶測試

Question

我的模板是：

Resources:
  LambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Code:
        ZipFile: |
          import json
          import boto3

          s3 = boto3.client('s3')

          def lambda_handler(event, context):
            # Get bucket name from the S3 event
            print(event)

            bucket_name = event['detail']['requestParameters']['bucketName']

            # Create a bucket policy
            bucket_policy =json.dumps({
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Sid": "MustBeEncryptedAtRest",
                  "Effect": "Deny",
                  "Principal": "*",
                  "Action": "s3:PutObject",
                  "Resource": [
                    "arn:aws:s3:::{}".format(bucket_name),
                    "arn:aws:s3:::{}/*".format(bucket_name)
                  ],
                  "Condition": {
                    "StringNotEquals": {
                      "s3:x-amz-server-side-encryption": [
                        AES256
                        "aws:kms"
                      ]
                    }
                  }
                },
                {
                  "Sid": "MustBeEncryptedInTransit",
                  "Effect": "Deny",
                  "Principal": "*",
                  "Action": "s3:*",
                  "Resource": [
                    "arn:aws:s3:::{}".format(bucket_name),
                    "arn:aws:s3:::{}/*".format(bucket_name)
                  ],
                  "Condition": {
                    "Bool": {
                      "aws:SecureTransport": "false"
                      }
                  }
                } ] })


            # Set the new policy
            s3.put_bucket_policy(Bucket=bucket_name, Policy=bucket_policy),
      Handler: index.lambda_handler
      Role: 'arn:aws:iam::role'
      Runtime: python3.7
  EventRule:
    Type: 'AWS::Events::Rule'
    Properties:
      EventPattern:
        source:
          - aws.s3
        detail-type:
          - AWS API Call via CloudTrail
        detail:
          eventSource:
            - s3.amazonaws.com
          eventName:
            - CreateBucket

這成功創建了一個 lambda function 以及一個事件橋事件，我必須手動添加事件橋的觸發器，但是當我創建一個 s3 存儲桶時，沒有策略。 沒有錯誤參考供我查看，目前我找不到任何邏輯錯誤。 這是在我使用上面的模板創建的堆棧上。 有任何想法嗎？

Answer 1

調查此問題的最佳方法是通過 CloudWatch。

首先在 Lambda 存在的區域中檢查您的 CloudWatch 日志。 這將識別 Lambda function 的任何問題，例如：

• IAM 缺少您角色的權限
• Python 解析錯誤（無效語法）

如果沒有日志，請檢查 CloudWatch 指標以確保正在調用 function。 如果不是，則事件不會觸發。

此外，要將 Lambda 作為觸發器自動添加，您需要將其作為 CloudWatch 事件規則的目標包含在模板中。

以下是您需要的大致模板。

Resources:
  LambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Code:
        ZipFile: |
          import json
          import boto3

          s3 = boto3.client('s3')

          def lambda_handler(event, context):
            # Get bucket name from the S3 event
            print(event)

            bucket_name = event['detail']['requestParameters']['bucketName']

            # Create a bucket policy
            bucket_policy =json.dumps({
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Sid": "MustBeEncryptedAtRest",
                  "Effect": "Deny",
                  "Principal": "*",
                  "Action": "s3:PutObject",
                  "Resource": [
                    "arn:aws:s3:::{}".format(bucket_name),
                    "arn:aws:s3:::{}/*".format(bucket_name)
                  ],
                  "Condition": {
                    "StringNotEquals": {
                      "s3:x-amz-server-side-encryption": [
                        AES256
                        "aws:kms"
                      ]
                    }
                  }
                },
                {
                  "Sid": "MustBeEncryptedInTransit",
                  "Effect": "Deny",
                  "Principal": "*",
                  "Action": "s3:*",
                  "Resource": [
                    "arn:aws:s3:::{}".format(bucket_name),
                    "arn:aws:s3:::{}/*".format(bucket_name)
                  ],
                  "Condition": {
                    "Bool": {
                      "aws:SecureTransport": "false"
                      }
                  }
                } ] })


            # Set the new policy
            s3.put_bucket_policy(Bucket=bucket_name, Policy=bucket_policy),
      Handler: index.lambda_handler
      Role: 'arn:aws:iam::role'
      Runtime: python3.7
  EventRule:
    Type: 'AWS::Events::Rule'
    Properties:
      EventPattern:
        source:
          - aws.s3
        detail-type:
          - AWS API Call via CloudTrail
        detail:
          eventSource:
            - s3.amazonaws.com
          eventName:
            - CreateBucket
      Targets:
        - 
          Arn: !GetAtt LambdaFunction.Arn
          Id: "TargetFunctionV1"
  PermissionForEventsToInvokeLambda: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Ref: "LambdaFunction"
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: !GetAtt EventRule.Arn