Solve - S3 Access Denied when calling PutObject

Solving - S3 Access Denied when calling PutObject #

The S3 error "(AccessDenied) when calling the PutObject operation" occurs when we try to upload a file to an S3 bucket without having the necessary permissions.

In order to solve the "(AccessDenied) when calling the PutObject operation" error:

1. Open the AWS S3 console and click on your bucket's name
2. Click on the Permissions tab and scroll down to the Block public access (bucket settings) section
3. If you are uploading files and making them publicly readable by setting their acl to public-read, verify that creating new public ACLs is not blocked in your bucket. Save and confirm the changes.

4. On the same page scroll down to the Bucket Policy section and verify that your bucket policy does not Deny the PutObject action or have a Condition that prevents you from uploading files, e.g. an IP restriction

5. Verify that you are not misspelling the name of the bucket when uploading files. E.g. in this example I try to upload a file to a bucket named hello. Since I don't own this bucket, I get the "(AccessDenied) when calling the PutObject operation" error

6. Open the permissions policy, attached to your IAM entity (the user or role) that is responsible for granting the PutObject permissions and verify that it has the following actions allowed:

Copied!
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "s3:PutObject",
                "s3:PutObjectAcl",
                "s3:GetObject",
                "s3:GetObjectAcl",
                "s3:AbortMultipartUpload"
            ],
            "Resource": [
                "arn:aws:s3:::YOUR_BUCKET",
                "arn:aws:s3:::YOUR_BUCKET/*"
            ],
            "Effect": "Allow"
        }
    ]
}

Once the policy is attached to the IAM entity you will be able to upload files to your S3 bucket.

Further Reading #

• AWS CDK Tutorial for Beginners - Step-by-Step Guide
• How does AWS CDK work
• What is a Token in AWS CDK
• CDK Constructs - Complete Guide
• What is an identifier (id) in AWS CDK
• How to use Context in AWS CDK
• How to use Parameters in AWS CDK