Amazon Bedrock interacts with other AWS services, such as Amazon S3, by assuming an AWS Identity and Access Management (IAM) role. This role must be granted the specific permissions required to access the resources. When data in an S3 bucket is encrypted with SSE-S3, Amazon S3 manages the encryption and decryption keys. For a service like Bedrock to access an encrypted object, the IAM role it assumes must have s3:GetObject permission for that object. The failure indicates that the role lacks this necessary permission. Granting the permission allows Amazon S3 to transparently decrypt the data for Bedrock upon request, resolving the access failure.

1. AWS S3 Documentation on SSE-S3: "To access objects that are encrypted by using SSE-S3

you must have s3:GetObject permission. When you have this permission

Amazon S3 handles both encryption and decryption for you. You don't need to make any changes to your applications to access SSE-S3 encrypted objects."

Source: AWS Security Documentation

Amazon Simple Storage Service User Guide

"Protecting data using server-side encryption with Amazon S3-managed encryption keys (SSE-S3)"

Section: "Accessing objects that are encrypted using SSE-S3".

2. AWS Bedrock Documentation on Data Source Permissions: "For Amazon S3 data sources

Amazon Bedrock requires permissions to access the S3 bucket containing your files. You can create a service role that gives Amazon Bedrock these permissions... The role must have a trust policy that allows Amazon Bedrock to assume it... Attach an identity policy to the role that grants permissions to your S3 bucket." The documentation then specifies that the policy must include the s3:GetObject action.

Source: AWS Foundation Model Service Documentation

Amazon Bedrock User Guide

"Knowledge bases for Amazon Bedrock"

Section: "Create a data source".

3. AWS IAM Documentation on Service Roles: "An IAM role is an IAM identity that you can create in your account that has specific permissions... A role can be assumed by anyone who needs it... An AWS service can assume a role to perform actions in other services on your behalf."

Source: AWS Identity and Access Management Documentation

IAM User Guide

"IAM roles"

Section: "IAM role use cases".