Understand How IAM and Organizations Interact
AWS Organizations does not replace associating IAM policies with users, groups, and roles within an AWS account.
IAM policies let you allow or deny access to AWS services (such as Amazon S3), individual AWS resources (such as a specific S3 bucket), or individual API actions (such as s3:CreateBucket). An IAM policy can be applied only to IAM users, groups, or roles, and it can never restrict the root identity of the AWS account.
By contrast, AWS Organizations lets you use service control policies (SCPs) to allow or deny access to particular AWS services for individual AWS accounts, or for groups of accounts within an organizational unit (OU). The specified actions from an attached SCP affect all IAM users, groups, and roles for an account, including the root account identity.
When you apply an SCP to an OU or an individual AWS account, you choose to either enable (whitelist), or disable (blacklist) the specified AWS service. Access to any service that isn’t explicitly allowed by the SCPs associated with an account, its parent OUs, or the master account is denied
When an SCP is applied to an OU, it is inherited by all of the AWS accounts in that OU.
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