As a DevOps engineer, there are cases where you need to provide cross-account access to the objects in your AWS account.
If you want to achieve that, you can use the cross-account assumption of IAM roles or resource-based policies. However, there are several problems when implementing these methods:
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Lightlytcs now supports all methods of cross-account assume role, and will help you understand which resources and even users have access to another account, via which configuration.
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Cross-account IAM Roles are used to define access to resources within a single account, but they are not restricted to a single account. For example, The EC2 servers in your staging environment can safely get access to an S3 bucket in production by using a properly defined role to do so. Cross-account Role is the right tool to comply with best practices and simplify credential management, as it eliminates the need to manage third party credentials.
Cross account Resource-based Policies
With Resource-based policies, you can also grant cross-account access to your resources. Instead of using a role as a proxy, you can attach a policy directly to the resource you want to share. The resource that you want to share must support resource-based policies.
A resource-based policy with cross-account access has an advantage over a role-based policy. If a resource is accessed via a resource-based policy, the user still works in the trusted account and does not have to give up its user permissions in place of its role permissions. In other words, the user continues to have access to resources in the trusted account at the same time as he has access to the resource in the trusting account. This is useful for tasks such as copying information to or from the shared resource in the other account.
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