IAM Roles and Policies - DynamoDB Access Control and Authentication

Syntax

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "effect",
            "Action": "dynamodb:Action",
            "Resource": "arn:aws:dynamodb:region:account-id:table/table-name"
        }
    ]
}

Example

Suppose you want to allow a user to read and write data from a DynamoDB table named "example-table" in the "us-east-1" region. The following policy would allow the user to perform the necessary actions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "dynamodb:GetItem",
                "dynamodb:PutItem",
                "dynamodb:UpdateItem",
                "dynamodb:DeleteItem"
            ],
            "Resource": "arn:aws:dynamodb:us-east-1:123456789012:table/example-table"
        }
    ]
}

Output

The user would be able to read and write data from the "example-table" DynamoDB table in the "us-east-1" region.

Explanation

IAM roles and policies allow you to control access to your DynamoDB tables. By creating policies that specify which actions a user can perform on a specific table, you can ensure that your data is only accessible by authorized users.

Use

Use IAM roles and policies for DynamoDB access control and authentication when you want to limit access to your data based on user roles and permissions. This is particularly important for organizations that have multiple users accessing the same tables, as it ensures that each user only has access to the data they need.

Important Points

• IAM policies should be assigned to groups or users, rather than directly to resources like DynamoDB tables.
• IAM policies can be created and edited in the AWS Management Console or via programmatic access using the AWS CLI or API.
• IAM policies can be nested, allowing you to create complex access control structures for your DynamoDB tables.
• Always follow the principle of least privilege when creating IAM policies, only granting the minimum necessary permissions to perform the required actions.

Summary

IAM roles and policies provide a powerful mechanism for controlling access to DynamoDB tables. By defining policies that specify which actions a user can perform on a specific table, you can ensure that your data is only accessible by authorized users. Use IAM roles and policies to restrict access to your data based on user roles and permissions, and follow the principle of least privilege to ensure that users only have access to the data they need.