Chris Lu
3b9e196e5f
sts: enforce session-policy explicit deny during role chaining ( #10103 )
...
* sts: enforce session-policy explicit deny during role chaining
A chained AssumeRole caller authenticates with an STS session token whose
inline session policy can explicitly deny sts:AssumeRole. The deny check only
evaluated the caller's named policies, so such a session could still chain into
any role its trust policy admits. Validate the session token in the deny check
and honor an explicit Deny in the inline session policy too.
* test(sts): integration coverage for AssumeRole authorization
Add an end-to-end AssumeRole authorization test (real weed mini + boto3):
a non-admin caller assumes a role its trust policy admits, an explicit
identity-side deny is blocked, and a session policy's explicit deny blocks
role chaining.
* sts: skip OIDC tokens and reject revoked sessions in the chaining deny check
Review follow-ups on the session-policy deny check:
- Guard session validation with !isOIDCToken so a bearer token our STS service
cannot validate does not error into a false deny.
- Reject a revoked session before evaluating its policy, restoring the
revocation enforcement the AssumeRole path lost when it stopped routing
through IsActionAllowed.
2026-06-24 21:38:21 -07:00
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