Project-declaredLean 4.31.0 · null

Partial authorize erroring policies is sound

Cedar.Thm.partial_authorize_erroring_policies_is_sound

authorization program verification semantics tpe

Plain-language statement

All policies reported as erroring after partial authorization will appear in the set of erroring policies after concrete authorization.

Exact Lean statement

theorem partial_authorize_erroring_policies_is_sound
  {schema : Schema}
  {policies : List Policy}
  {req : Request}
  {es : Entities}
  {preq : PartialRequest}
  {pes : PartialEntities}
  {response : TPE.Response} :
  TPE.isAuthorized schema policies preq pes = Except.ok response →
  isValidAndConsistent schema req es preq pes = Except.ok () →
  (response.errorForbids ∪ response.errorPermits) ⊆ (Spec.isAuthorized req es policies).erroringPolicies

Formal artifact

Lean source

Canonical source

Full Lean sourceLean 4

theorem partial_authorize_erroring_policies_is_sound  {schema : Schema}  {policies : List Policy}  {req : Request}  {es : Entities}  {preq : PartialRequest}  {pes : PartialEntities}  {response : TPE.Response} :  TPE.isAuthorized schema policies preq pes = Except.ok response →  isValidAndConsistent schema req es preq pes = Except.ok () →  (response.errorForbids ∪ response.errorPermits) ⊆ (Spec.isAuthorized req es policies).erroringPolicies:= by  intro h₁ h₂  simp only [TPE.isAuthorized] at h₁  cases h₃ : isAuthorized.evaluatePolicies schema policies preq pes <;>    simp [h₃] at h₁  subst h₁  have h_equiv := evaluatePolicies_residuals_equiv h₂ h₃  have h_err_permit := partial_authorize_error_policies_is_sound .permit h_equiv  have h_err_forbid := partial_authorize_error_policies_is_sound .forbid h_equiv  rw [Set.union_subset]  exact .intro h_err_forbid h_err_permit

Project: Cedar Specification
License: Apache-2.0
Commit: 3f093947b8ae
Source: cedar-lean/Cedar/Thm/TPE.lean:123-144

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authorizationprogram verificationsemantics

Source project: Cedar Specification

Person-level attribution pending.

View proof record