Master AWS Certified Cloud Practitioner CLF-C02 Exam/

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S3 Access Management

S3 Access Management

Learn about multiple ways to manage access to an S3 bucket and its objects.

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Security of data on the cloud is the first priority for developers and enterprises. The inherently public nature of the cloud poses challenges in preventing unauthorized access and handling potential security threats from malicious actors.

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Amazon S3 offers a comprehensive suite of tools and mechanisms to effectively control and manage access to objects within a bucket. In this lesson, we’ll explore the security measures for data in the cloud environment.

IAM user policies

IAM policies are JSON or YAML-based policies that help us control users’ access to AWS services and resources. Let’s look at an example below:

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{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::my-bucket/*"
        }
    ]
}

Here, the IAM user policy allows the user to fetch objects from the S3 bucket named my-bucket.

These permissions can be attached to the users, groups, and roles allowed to access the bucket’s objects. Although IAM policies are simpler to manage when controlling access to multiple buckets, managing them for cross-account users can be difficult as we would need other IAM resources besides the policies. Similarly, if we want to give access to ...