Resolving AWS CodePipeline's AssumeRole Authorization Issue

Learn how to fix the AWS CodePipeline error that indicates the role is not authorized to perform `AssumeRole` on another role. Follow these clear steps to modify IAM roles effectively.
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Resolving AWS CodePipeline's AssumeRole Authorization Issue

When working with AWS CodePipeline, encountering an authorization error can halt your deployment process and lead to frustration. One common error arises when the CodePipeline role is not authorized to perform AssumeRole on another role specified in the "action" block of a stage. This guide explores the problem and provides a clear solution to get your deployment back on track.

Understanding the Problem

In your AWS CodePipeline configuration, you may want to separate the execution roles for different stages. For instance, in the deployment stage, you might want to use a different IAM role than the one assigned to the entire pipeline. This is common in environments where permissions need to be granularly managed.

Here's a simplified explanation of the scenario outlined:

You have a CodePipeline role (codepipeline_role_arn).

You want to deploy using a separate IAM role (another_codepipeline_role_arn).

When applying this configuration, Terraform throws an error indicating that the CodePipeline role lacks permissions to AssumeRole for the specified deployment role.

The specific error message looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Solution: Modifying IAM Roles

To resolve this issue, you need to ensure that your CodePipeline role has the correct permissions to AssumeRole for the role defined in your deployment stage. Follow these steps to update your IAM policies effectively.

Step 1: Modify the CodePipeline Role

You need to add the sts:AssumeRole permissions to the CodePipeline role. This allows your pipeline to assume the deployment role as needed. Here’s how to modify it:

Locate the IAM Policy for the CodePipeline role (the codepipeline_role_arn).

Add the sts:AssumeRole Action to the policy. Here’s an example of how the updated policy might look:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Verify the Deployment Role's Trust Relationship

You also need to ensure that the deployment role (another_codepipeline_role_arn) trusts the CodePipeline service to assume it. Check the trust relationship policy document of this role. It should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Apply Changes

Once you've made the necessary modifications in both roles (the CodePipeline role and the deployment role), apply your changes using Terraform or your preferred infrastructure management tool. This should deactivate the authorization error and allow your pipeline to deploy successfully.

Conclusion

By adding proper sts:AssumeRole permissions for the CodePipeline role, you are enabling your CodePipeline to utilize multiple IAM roles efficiently, ensuring a smooth deployment workflow. Remember to check the trust relationships to maintain proper security practices. Keep these modifications in mind when structuring your AWS resources for optimal performance.

If you have any further questions or run into issues, don’t hesitate to reach out for help. Happy coding!

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