Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 3 discussion

aws:PrincipalOrgID Validates if the principal accessing the resource belongs to an account in your organization.

Condition keys: AWS provides condition keys that you can query to provide more granular control over certain actions. The following condition keys are especially useful with AWS Organizations: aws:PrincipalOrgID – Simplifies specifying the Principal element in a resource-based policy. This global key provides an alternative to listing all the account IDs for all AWS accounts in an organization. Instead of listing all of the accounts that are members of an organization, you can specify the organization ID in the Condition element. aws:PrincipalOrgPaths – Use this condition key to match members of a specific organization root, an OU, or its children. The aws:PrincipalOrgPaths condition key returns true when the principal (root user, IAM user, or role) making the request is in the specified organization path. A path is a text representation of the structure of an AWS Organizations entity.

aws:PrincipalOrgID - global key provides an alternative to listing all the account IDs for all AWS accounts in an organization.

Not B because: aws:PrincipalOrgPaths require you change the OU path when the user switch to another OU Not C because: you need to put effort to update policy which introduces operational overhead. Not D because: require a good tag management across multiple accounts. Like team "HR", team "QA", team "Security" and so forth. Also need to update if the user is moved to another team with different tag.

PrincipalOrgID is used to validate that the iam user accesing data is from the organisation only

aws:PrincipalOrgID is the most efficient and straightforward way to restrict access to resources to entities within an AWS Organization. It reduces the need for constant monitoring, tagging, or OU management, making it the optimal solution for scenarios requiring minimal operational overhead.

use a new condition key, aws:PrincipalOrgID, in these policies to require all principals accessing the resource to be from an account (including the master account) in the organization. For example, let’s say you have an Amazon S3 bucket policy and you want to restrict access to only principals from AWS accounts inside of your organization. To accomplish this, you can define the aws:PrincipalOrgID condition and set the value to your organization ID in the bucket policy. Your organization ID is what sets the access control on the S3 bucket. Additionally, when you use this condition, policy permissions apply when you add new accounts to this organization without requiring an update to the policy.

Answered by ChatGPT with an explanation. The correct solution that meets these requirements with the least amount of operational overhead is Option A: Add the aws PrincipalOrgID global condition key with a reference to the organization ID to the S3 bucket policy. Option A involves adding the aws:PrincipalOrgID global condition key to the S3 bucket policy, which allows you to specify the organization ID of the accounts that you want to grant access to the bucket. By adding this condition to the policy, you can limit access to the bucket to only users of accounts within the organization.

This is the least operationally overhead solution because it requires only a single configuration change to the S3 bucket policy, which will allow access to the bucket for all users within the organization. The other options require ongoing management and maintenance. Option B requires the creation and maintenance of organizational units for each department. Option C requires monitoring of specific CloudTrail events and updates to the S3 bucket policy based on those events. Option D requires the creation and maintenance of tags for each user that needs access to the bucket.

Option A proposes adding the aws PrincipalOrgID global condition key with a reference to the organization ID to the S3 bucket policy. This would limit access to the S3 bucket to only users of accounts within the organization in AWS Organizations, as the aws PrincipalOrgID condition key can check if the request is coming from within the organization.

B. Create an organizational unit (OU) for each department. Add the AWS: Principal Org Paths global condition key to the S3 bucket policy. This solution allows for the S3 bucket to only be accessed by users within the organization in AWS Organizations while minimizing operational overhead by organizing users into OUs and using a single global condition key in the bucket policy. Option A, adding the Principal ID global condition key, would require frequent updates to the policy as new users are added or removed from the organization. Option C, using CloudTrail to monitor events, would require manual updating of the policy based on the events. Option D, tagging each user, would also require manual tagging updates and may not be scalable for larger organizations with many users.

Keywords: - Company uses AWS Organizations - Limit access to this S3 bucket to only users of accounts within the organization in AWS Organizations - LEAST amount of operational overhead A: Correct - We just add PrincipalOrgID global condition key with a reference to the organization ID to the S3 bucket policy B: Incorrect - We can limit access by this way but this will take more amount of operational overhead C: Incorrect - AWS CloudTrail only log API events, we can not prevent user access to S3 bucket. For update S3 bucket policy to make it work you should manually add each account -> this way will not be cover in case of new user is added to Organization. D: Incorrect - We can limit access by this way but this will take most amount of operational overhead

Option A, which suggests adding the aws PrincipalOrgID global condition key with a reference to the organization ID to the S3 bucket policy, is a valid solution to limit access to the S3 bucket to users within the organization in AWS Organizations. It can effectively achieve the desired access control. It restricts access to the S3 bucket based on the organization ID, ensuring that only users within the organization can access the bucket. This method is suitable if you want to restrict access at the organization level rather than individual departments or organizational units. The operational overhead for Option A is also relatively low since it involves adding a global condition key to the S3 bucket policy. However, it is important to note that the organization ID must be accurately configured in the bucket policy to ensure the desired access control is enforced. In summary, Option A is a valid solution with minimal operational overhead that can limit access to the S3 bucket to users within the organization using the aws PrincipalOrgID global condition key.

AWS Identity and Access Management (IAM) now makes it easier for you to control access to your AWS resources by using the AWS organization of IAM principals (users and roles). For some services, you grant permissions using resource-based policies to specify the accounts and principals that can access the resource and what actions they can perform on it. Now, you can use a new condition key, aws:PrincipalOrgID, in these policies to require all principals accessing the resource to be from an account (including the master account) in the organization.

A. Correct answer. Bucket policy controls who can access to S3 and their objects. If we refer in the bucket policy to the organization, we can limit who can access inside that organization. B. Despite this option is correct, it is unnecessarily complex. We don’t need to separate the AWS Organization users for the requirements imposed in the question. So, it only aggregates more operational overhead. C. Using CloudTrail for controlling the S3 access permissions is not suitable and require so many events to be monitored. Additionally, it only registers the logs, so CloudTrail cannot impose restrictions over the accounts that access to S3. D. Tagging each user is not an scalable or efficient solution since you need to tag every user in the infrastructure, which is probably not static. Additionally, it makes unnecessary verbose the S3 bucket policy associated to that bucket.

Ans A: LEAST amount of organisational overhead: instead of listing all accounts which are members of organisation, instead specify the orgn. ID in the Condition element

A for sure