Aws trust relationship conditions, Put simply: You can limit who is allowed to select an IAM This topic describes the keys defined and provided by the IAM service (with an iam: prefix) and the AWS Security Token Service (AWS STS) service (with an sts: prefix). 1. May 28, 2025 · The principal component of a trust policy defines which principals can assume a role. Nov 3, 2022 · In this post, you learned how to craft trust policies for your IAM roles to restrict their assumption by specific principals and under certain conditions, and to combine multiple statements with different conditions. If you only want certain IAM Roles to be used on particular instances, you would need to enforce that through the use of iam:PassRole. To add additional layers of security to your AWS Control Tower environment, you can impose conditions in your role trust policies, to restrict the accounts and resources that interact with certain roles in AWS Control Tower. Feb 14, 2020 · No, it is not possible to put limitations in the Trust Policy. When you use Directory Service to create a role using the procedure in Creating a new IAM role, this trust relationship is automatically set. This is the permission that determines whether somebody has permission to pass a particular role to a service (such as an EC2 instance). Your community starts here. They are essential for enabling cross-account access and service integrations but require careful configuration to avoid unintended privilege escalation. In my next article, we will examine the service that generates temporal and short-lived credentials, AWS Security Token Service (STS). The table below summarizes the various types of principles that can be used with a trust policy. Aug 25, 2018 · So, a role needs two things: permission policies (what resources can be accessed and what actions can be taken) and a trust policy (what entities can assume the role). Share solutions, influence AWS product development, and access useful content that accelerates your growth. They act as the gatekeeper for role assumption, establishing the trust relationship between the role and the entities that can use it. Solution Use conditions When making . Several other AWS services also provide service-specific keys that are relevant to the actions and resources defined by that service. Aug 26, 2021 · Abusing the Trust Policy In general, an IAM role can be assumed when the 2 following requirements are met: The target role has a trust relationship with the principal, which attempts to assume the Mar 20, 2020 · Background As a company scales out the number of AWS accounts used for different workloads, they may require IAM roles which are able to be assumed by any other account within the organization to perform some action, if you are trusting accounts by adding each account principal to the trust policy you may soon find your self hitting the 2048 character limit. Connect with builders who understand your journey. Trust relationships in GitHub Actions AWS IAM roles are defined through IAM role trust policies that specify conditions for accepting OIDC tokens. In AWS IAM, trust relationships define which entities can assume a role and under what conditions. You can assign your existing IAM roles to your Directory Service users and groups. Overview of IAM Trust Policies AWS IAM Trust Policies are JSON documents that define which principals (users, roles, or services) can assume a specific IAM role. May 28, 2025 · In this article, we dive deep into one of the security features of AWS, AWS Trust Policy, which controls who can assume an IAM role. Feb 18, 2026 · This relationship allows AWS to verify that incoming requests genuinely originate from authorized GitHub repositories and workflows. To do this, however, the role must have a trust relationship with Directory Service.
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