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verify: note that a capless delegator scope is unconstrained #341

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Merged
bordumb merged 1 commit into from
Jun 21, 2026
Merged

verify: note that a capless delegator scope is unconstrained #341

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6 changes: 6 additions & 0 deletions crates/auths-verifier/src/commit_kel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -898,6 +898,12 @@ fn reject_unauthorized_delegate(
}
// Capability attenuation is time-independent: a delegate may never exceed the
// delegator-anchored scope, so it is enforced whether or not a time is given.
//
// Accepted risk: an empty delegator-anchored capability list means UNCONSTRAINED, not
// "deny all" — with nothing to attenuate against, every claimed capability passes. This is
// by design: the scope is advisory authorization, and a delegator that anchors a capless
// scope is choosing not to constrain the delegate. A capless grant is therefore as
// powerful as the delegator; constrain a delegate by anchoring a non-empty capability set.
if !scope.capabilities.is_empty() {
for claimed in parse_scope_claim(commit_bytes) {
if !scope.capabilities.iter().any(|c| c.as_str() == claimed) {
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