aws-lambda - 如何使用 cloudformation 和 SAM 将所需的策略添加到 lambda

Question

我想创建一个可以访问 dynamoDB 和其他 lambda 函数的 lambda 函数。但是，我不知道如何为 SAM 制作适当的 YAML 模板来授予适当的权限。

特别是，我不明白包括定义在内的令人困惑的3个条目权限(AWS::IAM::Role、AWS::Serverless::Function、AWS::Lambda::Permission)。我应该使用哪个条目来添加必要的权限？

下面是我的 YAML。但创建的 my_lambda_role 没有 AWSLambdaRole 策略和 dynamoDB 策略。因此，lambda 无法访问 dynamoDB。请告诉我如何修复它。

  MyLambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: lambda.amazonaws.com
          Action: sts:AssumeRole
      ManagedPolicyArns:
      - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      - arn:aws:iam::aws:policy/service-role/AWSLambdaRole
      RoleName: my_lambda_role

  OnConnectFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: onconnect/
      Handler: index.lambda_handler
      MemorySize: 256
      Role: !GetAtt MyLambdaRole.Arn
      Runtime: python3.6
      Environment:
        Variables:
          TABLE_NAME: !Ref TableName
      Policies:
      - DynamoDBCrudPolicy:
          TableName: !Ref TableName
      - Statement:
        - Effect: Allow
          Action:
          - 'execute-api:ManageConnections'
          Resource:
          - 'arn:aws:execute-api:*:*:*/@connections/*'

  OnConnectPermission:
    Type: AWS::Lambda::Permission
    DependsOn:
      - MyAPI
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref OnConnectFunction
      Principal: apigateway.amazonaws.com

Answer 1

您可以添加缺少的政策。根据您的需要，但如果您想要完全访问权限，则可以添加 AmazonDynamoDBFullAccess:

      ManagedPolicyArns:
      - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      - arn:aws:iam::aws:policy/service-role/AWSLambdaRole
      - arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess