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Why the role alone cannot identify its caller
A role has permission policies and is intended to be assumed by a principal. When assumed, it provides temporary security credentials. People, applications, AWS services, and other workloads can all operate through roles, so the role name—or the fact that a request uses role credentials—does not establish whether a human or an agent initiated it. See AWS IAM roles.
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Keep two questions distinct: which principal is allowed to assume the role, and what the resulting role session is allowed to do. The first is governed by the role’s trust policy; the second by its permissions. An allowed assumption does not by itself grant unrestricted access, and a narrow permissions policy does not make an overly broad trust relationship safe. AWS explains this separation in How permissions and policies provide access management.
The four layers to examine
1. Identity source and authentication
Start with how the person or workload obtains an AWS identity. AWS recommends federation for human users, with IAM Identity Center as its centralized workforce access option. Workloads should use role-based temporary credentials rather than being treated as people simply because they access the same AWS account. AWS’s guidance is explicit: “Require your human users to use temporary credentials when accessing AWS.” This appears in the IAM User Guide’s Security best practices in IAM, under the recommendation to use federation with an identity provider.
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For an agent, identify the actual workload identity path: what principal or service obtains credentials, and through what authentication mechanism? A label such as “agent” in an application name is not an identity signal unless the authentication and access design makes it one.
2. Role trust and assumption
Inspect the trust policy to see which principals may assume the role and which conditions must be satisfied. Restrict that relationship to the intended identities and deployment context. Trust answers who can enter the role; it does not describe the full set of actions available after assumption.
For third-party cross-account access, an external ID can be required by a trust policy to address the confused-deputy risk in that scenario. It is not a universal secret password or a substitute for limiting trusted principals. AWS also documents a console role-switching limitation for roles that require an external ID. See Create a role to give permissions to an IAM user.
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Session tags can carry attributes that policies use for attribute-based access control (ABAC), such as a workload or project attribute. Their value depends on how they are supplied and controlled: a tag is session context, not self-authenticating proof that a person or a particular kind of agent is present. Where tags are passed, connected trust policies must allow sts:TagSession. AWS describes the mechanism in Pass session tags in AWS STS.
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When using attributes to distinguish access, decide which trusted identity or process may set them, which values are permitted, and how policies use them. Do not let an untrusted caller assert a tag and then treat that assertion as verified identity.
4. Permission evaluation
Review the role session’s effective authorization: permitted actions, resources, and policy conditions. Give a workload only the access it needs for its task, and keep its permissions distinct from human access where the tasks differ. The role’s permissions determine what the session can do; they do not retroactively prove who initiated the session.
How to keep an agent from inheriting human access
- Give the workload its own identity path. Do not route an agent through a human sign-in merely for convenience when it can use a workload identity and role.
- Constrain role assumption. Limit the trust policy to the intended principals and conditions. For third-party cross-account access, evaluate whether an external ID is appropriate to that relationship.
- Set permissions for the workload’s task. Limit actions, resources, and applicable conditions rather than copying a human role wholesale.
- Control session attributes. If policies rely on tags, restrict who can pass them and which values are accepted; allow
sts:TagSessiononly where needed. - Use temporary credentials and review access. Temporary credentials reduce reliance on long-term credentials, but do not replace least privilege, monitoring, careful trust design, or periodic access review.
Compare access designs across the whole path
When evaluating a human access design against an agent or workload design, compare each layer rather than relying on role names. The practical trade-off is operational convenience versus explicit separation and least privilege.
| Comparison area | Questions to answer |
|---|---|
| Identity and authentication | What identity source is used, and how does the person or workload authenticate? |
| Role trust | Which principals may assume the role, and what conditions restrict assumption? |
| Session context | Where do attributes come from, who may set them, and how are values constrained? |
| Permissions | Which actions and resources are allowed, and which conditions further limit them? |
| Credential lifetime | How long does the session last, and is role chaining involved? |
| Auditability | Can operators trace the identity path and session context associated with access? |
Session duration is a configuration constraint, not a way to infer caller type. AWS documents a one-hour maximum for role chaining. A directly assumed role session can be configured for up to 12 hours, subject to role settings. Neither duration identifies whether the caller is human or automated; see AWS IAM roles.
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