STS API Coverage

Overview

Spinifex implements 5 operations in the STS 2011-06-15 API model.

Trust policies

Trust policies are validated at write time rather than silently narrowed at assume time. NotPrincipal, NotAction, empty-string Action elements and empty Principal blocks are all rejected as malformed.

Condition blocks are rejected except on AssumeRoleWithWebIdentity with StringEquals, which is the shape IRSA needs and which Spinifex evaluates at assume time against the token's issuer, subject and audience. Anything wider is refused rather than accepted and ignored, because an accepted-but-unevaluated condition is a silent over-grant.

Parameters that are refused, not ignored

Several inputs the model describes are deliberately rejected rather than accepted as no-ops: inline session policies and policy ARNs, session tags, and MFA serial numbers and token codes. Each of them would otherwise appear to restrict or strengthen a session that in fact carries the role's full permissions.

Operations