Cross-Account Access to Amazon S3 | AWS IAM
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7 months ago
Published on Apr 21, 2024
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Table of Contents
Step-by-Step Tutorial: Cross-Account Access to Amazon S3 using AWS IAM
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Create a User in Account A:
- In Account A, create a user named Jack with a role in DCT Production.
- Assign an external ID to the role in DCT Production.
- Ensure the role has a trust policy and permissions policy to allow access to an S3 bucket.
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Generate Access Keys for User Jack:
- Create an access key and a secret access key for User Jack.
- Save these keys securely for future use.
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Attach User Policy to User Jack:
- Attach the user policy to the username Jack using the policy ARN.
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Create Access Keys for User Jack:
- Retrieve the access key ID and secret access key for User Jack.
- Store these values securely for future use.
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Assume Role in Account B:
- Log in to the AWS Management Console of Account B.
- Create a role with a trust relationship with Account A.
- Specify the account ID of Account A and an external ID for security.
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Run Assume Role Command:
- Copy the command provided in the AWS Management Console.
- Execute the command to assume the role in Account B.
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Set Environment Variables:
- Copy the access key ID, secret access key, and session token from the assume role command.
- Set these values as environment variables in your CLI.
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Test Access to S3 Bucket:
- Run AWS CLI commands without specifying a profile.
- Ensure that you can access and interact with S3 buckets in Account B.
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Cleanup:
- If needed, delete any resources or buckets created during the tutorial.
- Unset the environment variables to revert to your main account settings.
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Next Steps - Using IAM Roles with EC2:
- Consider exploring the next lesson on using IAM roles with EC2 instances for enhanced security and access control.
By following these steps, you will be able to set up cross-account access to Amazon S3 using AWS IAM and effectively manage permissions and roles between different AWS accounts.