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The challenge you're facing is a common one in managing AWS IAM roles and permissions, especially when trying to adhere to the principle of least privilege while avoiding privilege escalation. Here are some insights into your situation:
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Using Multiple Permission Boundaries: AWS currently does not support attaching multiple permission boundaries to a single IAM role. Permission boundaries are designed to be a single policy that defines the maximum permissions an IAM role can have.
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Better Approach?: There might not be a fundamentally "better" approach as AWS IAM is designed with certain constraints. However, you can optimize within these constraints. For instance, you could create a set of standardized permission boundary policies that correspond to different levels of access within your organization. These can be attached to roles as needed, depending on the level of access required.
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Best Approach: Between the two options you've listed:
- Managing Multiple Permission Boundaries: This approach provides RoleA with the ability to create roles within certain limits. It offers more flexibility but requires diligent management of permission boundaries to ensure they are appropriately scoped and updated.
- Central Management of Role Creation: Removing RoleA's permission to create roles and instead centralizing role creation with the admin can be more secure as it puts the creation and assignment of roles under strict control. However, it reduces flexibility and increases the administrative burden.
Considering these points, the best approach will depend on your organization's specific needs for autonomy versus control, as well as your capacity to manage permission boundaries effectively.
If a high degree of autonomy for RoleA is not critical and you want to minimize risk, centralizing role creation and management might be more suitable. You'd maintain strict control over permissions, and RoleA would simply use the roles as needed.
If RoleA needs the flexibility to create roles dynamically and you're able to manage permission boundaries well, then managing multiple permission boundaries would be the way to go. This allows for autonomy while still placing checks on the level of access roles can have.
In either case, it's essential to regularly audit permissions and boundaries to ensure they are as intended and that no unnecessary privileges exist. Automation tools and services like AWS CloudTrail, AWS Config, and third-party solutions can aid in monitoring and managing these configurations at scale.