Project-declaredLean 4.31.0 · null

Partial authorize decision is sound

Cedar.Thm.partial_authorize_decision_is_sound

authorization program verification semantics tpe

Project documentation

Main partial authorization soundness theorem: If partial authorization returns a decision, then concrete authorization will reach the same.

Exact Lean statement

theorem partial_authorize_decision_is_sound
  {schema : Schema}
  {policies : List Policy}
  {req : Request}
  {es : Entities}
  {preq : PartialRequest}
  {pes : PartialEntities}
  {response : TPE.Response}
  {decision : Decision} :
  TPE.isAuthorized schema policies preq pes = Except.ok response →
  isValidAndConsistent schema req es preq pes = Except.ok () →
  response.decision = some decision →
  (Spec.isAuthorized req es policies).decision = decision

Formal artifact

Lean source

Canonical source

Full Lean sourceLean 4

theorem partial_authorize_decision_is_sound  {schema : Schema}  {policies : List Policy}  {req : Request}  {es : Entities}  {preq : PartialRequest}  {pes : PartialEntities}  {response : TPE.Response}  {decision : Decision} :  TPE.isAuthorized schema policies preq pes = Except.ok response →  isValidAndConsistent schema req es preq pes = Except.ok () →  response.decision = some decision →  (Spec.isAuthorized req es policies).decision = decision:= by  intro h₁ h₂  simp only [TPE.isAuthorized] at h₁  cases h₃ : isAuthorized.evaluatePolicies schema policies preq pes <;>    simp [h₃] at h₁  rw [← h₁]  exact residuals_decision_agrees (evaluatePolicies_residuals_equiv h₂ h₃)

Project: Cedar Specification
License: Apache-2.0
Commit: 3f093947b8ae
Source: cedar-lean/Cedar/Thm/TPE.lean:79-98

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Person-level attribution pending.

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