授予AWS Lambda列出所有SNS主题的权限

Question

我有一个cloudformation模板来创建lambda函数和SNS主题。lambda函数执行一些处理，然后将结果发布到SNS主题。

要获取SNS主题的ARN，我正在使用该boto3.client('sns').list_topics()函数，然后搜索在模板中设置的SNS主题名称。

但是调用list_topics()API会给我以下错误：

An error occurred (AuthorizationError) when calling the ListTopics operation: User: arn:aws:sts::136732452473:assumed-role/test/severless-btc-update-PriceUpdateFunction-B38KNZMCBGB is not authorized to perform: SNS:ListTopics on resource: arn:aws:sns:eu-west-1:136732452473:*

如何在Cloudformation模板YAML文件中向我的lambda资源添加ListTopics权限？

这是我的cloudformation.yaml文件：

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: Bitcoin daily update


Parameters:
  PhoneNumber:
    Type: String
    Description: The phone number recipient of the update, in E.164 (e.g. +919876123456) format.
  UTCHour:
    Type: String
    Default: 3
    Description: The hour at which to send the update, in the UTC time zone.

Resources:
  PriceUpdateFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: main.lambda_handler
      Runtime: python3.6
      Timeout: 5
      CodeUri: main.py
      Environment:
        Variables:
          PHONE_NUMBER: !Ref PhoneNumber
      Events:
        ScheduledEvent:
          Type: Schedule
          Properties:
            Schedule: !Join [' ', ['cron(0', !Ref UTCHour, '* * ? *)']]
      Policies:
        - SNSPublishMessagePolicy:
          TopicName: !GetAtt SNSTopic.TopicName
  SNSTopic:
    Type: "AWS::SNS::Topic"
    Properties:
      TopicName: "sendSMS"
      DisplayName: "BitcoinPriceTopic"
      Subscription:
        -
          Endpoint: !Ref PhoneNumber
          Protocol: "sms"

Answer 1

您需要定义Lambda执行角色，并为函数分配适当的权限。应该有一个Role属性AWS::Serverless::Function

Role: !GetAtt LambdaExecutionRole.Arn

然后在模板中创建引用的角色：

  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal: {Service: [lambda.amazonaws.com]}
          Action: ['sts:AssumeRole']
      Path: /
      ManagedPolicyArns:
      - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      - arn:aws:iam::aws:policy/service-role/AWSLambdaRole
      Policies:
      - PolicyName: SNSPolicy
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Action:
              - "SNS:ListTopic" 
              Resource: ['*']

Action根据需要调整该部分中的权限。