Verify Always Allows is sound
Cedar.Thm.verifyAlwaysAllows_is_sound
Plain-language statement
The verifyAlwaysAllows analysis is sound: if the assertions verifyAlwaysAllows ps₁ εnv are unsatisfiable for the policies ps₁ and the strongly well-formed symbolic environment εnv, then the authorizer will return allow when applied to ps₁ and any strongly well-formed concrete environment env ∈ᵢ εnv.
Exact Lean statement
theorem verifyAlwaysAllows_is_sound {ps₁ : Policies} {εnv : SymEnv} {asserts : Asserts} :
εnv.StronglyWellFormedForPolicies ps₁ →
verifyAlwaysAllows ps₁ εnv = .ok asserts →
εnv ⊭ asserts →
∀ env,
env ∈ᵢ εnv →
env.StronglyWellFormedForPolicies ps₁ →
allows (Spec.isAuthorized env.request env.entities ps₁)Formal artifact
Lean source
theorem verifyAlwaysAllows_is_sound {ps₁ : Policies} {εnv : SymEnv} {asserts : Asserts} : εnv.StronglyWellFormedForPolicies ps₁ → verifyAlwaysAllows ps₁ εnv = .ok asserts → εnv ⊭ asserts → ∀ env, env ∈ᵢ εnv → env.StronglyWellFormedForPolicies ps₁ → allows (Spec.isAuthorized env.request env.entities ps₁):= by intro hwε₁ hvc hsat env hin hwe₁ unfold verifyAlwaysAllows at hvc rw [allows_eq_allowAll_implies _ env] exact verifyIsAuthorized_is_sound verifyImplies_wbaq (swf_εnv_for_allowAll_policies hwε₁.left) hwε₁ hvc hsat env hin (swf_env_for_allowAll_policies hwe₁.left) hwe₁- Project
- Cedar Specification
- License
- Apache-2.0
- Commit
- 3f093947b8ae
- Source
- cedar-lean/Cedar/Thm/Verification.lean:636-650
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