How to create a bucket with Public Read Access?

问题

I´d like to enable Public Read-Access on all items in my Bucket that are in the "public" folder in the serverless.yml file.

Currently this is definition code i use to declare my bucket. Its a bit of copy and paste from one of the serverless-stack examples.

Resources:
  AttachmentsBucket:
    Type: AWS::S3::Bucket
    Properties:
      AccessControl: PublicRead
      # Set the CORS policy
      BucketName: range-picker-bucket-${self:custom.stage}
      CorsConfiguration:
        CorsRules:
          -
            AllowedOrigins:
              - '*'
            AllowedHeaders:
              - '*'
            AllowedMethods:
              - GET
              - PUT
              - POST
              - DELETE
              - HEAD
            MaxAge: 3000

# Print out the name of the bucket that is created
Outputs:
  AttachmentsBucketName:
    Value:
      Ref: AttachmentsBucket

Now when i try to use a url for a file, it returns access denied. I manually have to set the public read permission for every file by hand in the aws-s3 web interface.

What am i doing wrong?

回答1:

Instead of using CorsConfiguration on the bucket, you need to attach a bucket policy to it. Try the following:

Resources:
  AttachmentsBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: range-picker-bucket-${self:custom.stage}

  AttachmentsBucketAllowPublicReadPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref AttachmentsBucket
      PolicyDocument:
        Version: "2012-10-17"
        Statement: 
          - Effect: Allow
            Action: 
              - "s3:GetObject"
            Resource: 
              - !Join ['/', [!Ref AttachmentsBucket, 'public']]
            Principal: "*"

回答2:

As the others have said, you need to implement a Bucket Policy such as this one:

{ "Version": "2012-10-17", "Statement": [ { "Sid": "PublicReadForGetBucketObjects", "Effect": "Allow", "Principal": "*", "Action": "s3:GetObject", "Resource": "arn:aws:s3:::{NAME_OF_YOUR_BUCKET_HERE}/*" } ] }

This can be done in the AWS console by selecting the Bucket, then Permissions, then Bucket Policy. Looks like @Milan C. is indicating how to declare this in a serverless.yml file.

来源：https://stackoverflow.com/questions/54259512/how-to-create-a-bucket-with-public-read-access

标签

amazon-s3

Serverless