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Add a deterministic Create(Note) vector for the initial map-local compound-proof profile. Verify its JCS inputs, hashes, signatures, tampering, proof replacement, and expected verification outcomes. Record the current typed serialization and inbound verification boundaries without changing runtime behavior. Keep the vector reproducible with a test-only generator, and exclude repository-only vectors from JSR publication. fedify-dev#938 Changelog: none Assisted-by: Codex:gpt-5.6-sol Assisted-by: Claude Code:claude-opus-5
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThis change adds bounded discovery and verification for map-local compound portable proofs. Inbox processing rejects unsupported or invalid nested proofs before dispatch. It also adds deterministic vectors, tests, documentation, and package exclusions. ChangesCompound portable proofs
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Sender
participant InboxHandler
participant CompoundProof
participant Dispatcher
Sender->>InboxHandler: send authenticated compound JSON
InboxHandler->>CompoundProof: inspect and verify nested map-local proofs
CompoundProof-->>InboxHandler: return aggregate result
InboxHandler->>Dispatcher: dispatch only when verification succeeds
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Add a bounded, immutable raw JSON discovery primitive for compound proof-bearing maps and record a deterministic context-conflict vector. The vector separates cryptographic validity from standalone JSON-LD interpretation, while the discovery tests cover atomic resource limits and non-JSON container edge cases. fedify-dev#938 Changelog: none Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1
Verify every discovered direct proof against one immutable JSON snapshot. Remove only the current map's literal proof so descendant proofs, aliases, and the received context remain bound by JCS. Return complete deepest-first results, reject nested maps without a local context, and avoid compatibility normalization or remote context loading on the inbound map-local path. fedify-dev#938 Changelog: none Assisted-by: OpenCode:deepseek-flash Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1
Apply the FEP-ef61 policy independently to portable maps found in the immutable compound snapshot, including unsigned maps in nested arrays. Reuse map-local cryptographic results so policy checks cannot change the received signing input. Keep malformed maps isolated in per-path results and ignore JSON-LD context definitions during secured-document discovery. fedify-dev#938 Changelog: none Assisted-by: Codex:gpt-5
Require the proof interpreted by FEP-ef61 policy to match the direct literal proof that passed map-local cryptographic verification. This prevents property-scoped contexts from assigning the same proof a different purpose at the policy layer. fedify-dev#938 Changelog: none Assisted-by: Codex:gpt-6-astra
Carry the expanded portable identity validated by FEP-ef61 policy into the compound result. This prevents a conflicting raw id property from being reported as authenticated when JSON-LD policy actually checked a different @id. fedify-dev#938 Changelog: none Assisted-by: Codex:gpt-6-astra
Verify every portable map in an authenticated inbox document against the immutable received JSON before consuming a nonce or dispatching the activity. Reject unsupported proof shapes and bounded-traversal failures atomically while preserving ordinary top-level proof handling. Add HTTP Signature, Linked Data Signature, tampering, proof-set, and non-portable regression coverage. fedify-dev#938 Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1
Describe the map-local secured-document boundary, immutable inbox verification, and atomic rejection of unsupported compound documents. Document the JSON-LD interpretation boundary and the current typed producer and single-proof limitations. fedify-dev#938 Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1
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In `@packages/fedify/src/sig/compound-proof.test.ts`:
- Around line 51-55: Update the vector assertions near the compound-proof tests
to derive and use a separate vectorInnerKeyId from
vector.keys.inner.verificationMethod, instead of the shared-key innerKeyId. Keep
innerKeyId for the generated proof path using ed25519PrivateKey, and leave the
vector expectations independent of the shared test key.
In `@packages/fedify/src/sig/compound-proof.ts`:
- Around line 217-225: Update hasOnlyDataProperties to iterate
Reflect.ownKeys(value), immediately reject any non-string key, and validate each
string-key descriptor is enumerable and contains a data value. Preserve the
existing false-on-exception behavior so symbol-keyed properties cannot be
accepted as valid JSON input.
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CHANGES.mdchanges.d/fedify/compound-portable-proofs.mddocs/manual/inbox.mddocs/manual/send.mdpackages/fedify/deno.jsonpackages/fedify/scripts/generate-map-local-vector.tspackages/fedify/src/federation/handler-compound-proof.test.tspackages/fedify/src/federation/handler.tspackages/fedify/src/sig/compound-proof-discovery.test.tspackages/fedify/src/sig/compound-proof-verification.test.tspackages/fedify/src/sig/compound-proof.test.tspackages/fedify/src/sig/compound-proof.tspackages/fedify/src/sig/mod.tspackages/fedify/src/sig/proof.tspackages/fedify/test-vectors/fep-8b32/README.mdpackages/fedify/test-vectors/fep-8b32/map-local-context-conflict.jsonpackages/fedify/test-vectors/fep-8b32/map-local-create-note.json
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Derive verification method IDs from each checked-in vector so their assertions remain stable if the shared test key changes. fedify-dev#1041 (comment) Assisted-by: Codex:gpt-5
Treat own symbol properties as non-JSON input so bounded discovery does not accept values containing data that traversal and snapshots omit. fedify-dev#1041 (comment) Assisted-by: Codex:gpt-5
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This PR implements the map-local compound-proof profile tracked by #938, including reproducible test vectors, bounded discovery and verification, portable-object policy checks, and inbox enforcement. It discovers secured maps in a frozen raw JSON snapshot and rejects the entire document if any required check fails.
Profile
Each raw JSON map with a direct
proofproperty is a separate secured document. Verification removes only the proof on the current map. An outer proof therefore retains the complete secured child in its JCS input, and replacing a valid inner proof invalidates the original outer proof.FEP-8b32 and Verifiable Credential Data Integrity do not currently specify boundaries for compound documents, so this PR defines an interoperability profile for them. An inner proof authenticates the extracted child map as a standalone JSON document. The outer proof covers the compound document, including the child and its proof. The child may still expand differently on its own than it does within the parent.
Test vectors and discovery
The deterministic
Create(Note)baseline uses two fixed Ed25519did:keyidentities. For each secured map, the vector records the map with its own proof removed, the proof configuration, the intermediate JCS and SHA-256 values, the signing input, the proof value, and the expected result. Tests derive these values from the recorded documents and test keys; the duplicate fixture fields are comparison data only.The second vector gives the parent a default language that the child's local context does not reset. Both map-local proofs remain cryptographically valid, but standalone and in-parent expansion assign different languages to the child's
content. Cryptographic verification uses the frozen raw map; equivalence between the two JSON-LD expansions is outside this profile.The checked-in generator lets other implementations reproduce the vectors. The vectors are excluded from the published JSR package.
Discovery validates and freezes the input JSON, then returns maps with one direct literal
proofin deepest-first order. Each result includes a stable JSON Pointer path and, when present, an object ID. Inputs are unsupported if they exceed the depth, map, proof, or byte limit, contain an unsupported proof shape, or include a non-JSON container. Values inside@contextdefinitions are not traversed.Map-local verification
Each discovered proof is verified independently against the same frozen snapshot. The verifier removes only the current map's literal
proofmember and preserves descendant proofs and aliases as signed data. Verification uses the received document context only. It does not retry with the proof context or with Fedify's outgoing compatibility normalization.Proof contexts are resolved only from Fedify's preloaded contexts. This inbound path ignores caller-supplied context loaders. A malformed context or invalid proof still produces a result for that map. Results for valid siblings remain intact. An input with no direct proofs is not reported as verified.
The tests cover successful inner and outer verification and failures caused by tampered content or replacement of a valid inner proof. They also cover proof aliases in the JCS input, separate document and proof contexts, malformed contexts, and scalar or array changes hidden by outgoing normalization.
Portable-object policy
The compound policy layer finds portable maps independently of proof discovery, so the result includes unsigned portable children, embedded collections, and portable objects inside arrays. Each map is classified and checked with the FEP-ef61 policy introduced in #832. The policy uses the cryptographic result for that map without reconstructing the signing input or fetching the object by ID.
A successful result binds the verified key and policy-expanded proof to the frozen raw map. It also identifies the direct literal proof that passed map-local verification. Policy checks the purpose of that proof, including under property-scoped contexts. When raw
idand JSON-LD@iddisagree, the result reports the canonical portable ID validated by policy.Nested portable maps require a local
@context. Policy expansion uses only preloaded contexts and does not fetch through a caller-supplied context loader. The top-level gateway allowance for an unsigned portable collection does not apply to an embedded collection. Malformed portable IDs and policy inputs produce per-path failures. Verification succeeds only if every discovered proof and portable map passes.Inbox enforcement
After the normal outer authentication and actor ownership checks, inbox processing inspects the received raw JSON for portable maps. If portable maps are present, or the bounded inspection cannot determine whether they are present, the compound policy must pass before Fedify consumes a deferred nonce or dispatches the activity. A valid outer proof therefore cannot authenticate an unsigned or invalid nested portable object.
The inbox uses fixed depth, map, proof, and byte limits. Unsupported proof shapes and inputs whose applicability cannot be established within those bounds are rejected.
Current boundaries
The compound verifier and the code that applies portable-object policy are internal. Proof sets, chains, aliases used as proof properties, and remote proof references are unsupported by the initial profile. The profile has no dedicated marker and accepts only one direct inline proof per secured map. Fedify's ordinary activity signer creates one proof per Ed25519 key, so producers of portable compound documents must attach exactly one direct proof to each map. Issue #1045 tracks producer-side handling of this limitation.
This does not change top-level
verifyProof(), handling of ordinary non-portable activities or top-level Object Integrity Proofs, or the option to skip signature verification.Typed
Createserialization still drops the document and proof contexts of an embedded signedNote, even after the child is reparsed through the vocabulary JSON-LD cache. Supporting producers exactly requires a representation carrier that preserves the signed child JSON instead of reconstructing it from the parent. On the inbound path, verification never reconstructs a missing child context from the parent. Issue #1044 tracks preserving signed child representations during typed serialization.The profile, inbox behavior, and interoperability limits are documented in the Object Integrity Proofs and inbox sections of the Fedify manual. Signed child representations are out of scope because supporting them requires changes to the vocabulary runtime or generated serializers.
Closes #938.