073203abae
Upstream RNS enforces two requirements in code that SPEC.md left implicit;
both caused silent message loss in a clean-room Go LXMF service against
upstream Python rns 1.2.4 / lxmf 0.9.7.
§6.4.2 LRRTT — initiator's link-activation packet
- HEADER_1, DATA, dest_type=LINK (0x03), ctx=0xfe; body is
`umsgpack.packb(rtt_seconds)` encrypted with the link's session keys.
- The responder transitions HANDSHAKE→ACTIVE only on LRRTT receipt
(Link.py:534-553), which is also what fires the link_established
callback. LXMF's set_resource_strategy(ACCEPT_APP) is installed
from that callback; without it, every RESOURCE_ADV the initiator
sends hits the silent ACCEPT_NONE branch at Link.py:1087.
§6.4.3 Header type for post-handshake DATA and Resource
- Link-addressed packets are routed via link_table, which forwards
header bytes verbatim (Transport.py:1587-1622). HEADER_2 with a
relay's transport_id therefore arrives at the destination intact
and is dropped by packet_filter (Transport.py:1283-1285) as
"for another transport instance".
- Mandates HEADER_1 with no transport_id for all post-handshake
link DATA / Resource / control packets regardless of hop count.
- Asymmetry with LINKREQUEST (which IS path_table-routed and so
HEADER_2-eligible) is spelled out.
Companion changes:
- §6.4 renamed to "Session keys and link activation"; existing
HKDF content moved into §6.4.1.
- §2.5 LRRTT context-byte entry points at §6.4.2.
- §12.5.2 (Link DATA forwarding) cross-references §6.4.3.
- §14 failure-modes table: two new entries for the silent-drop
chains documented above.
- flows/send-link-lxmf.md step 4 strengthened (LRRTT is mandatory,
not informational); step 6 corrected (Transport.outbound does NOT
apply HEADER_1→HEADER_2 for link DATA — that conversion is
path_table-keyed, link DATA is link_table-keyed).
- test-vectors/links.json extended with an LRRTT entry: pinned
rtt_seconds=0.05 + pinned 16-byte IV produces deterministic
wire bytes for the encrypted body.
- tools/regen_links.py drives the LRRTT generation with an
os.urandom patch for the Token IV.
- tools/verify_link_lrrtt.py (new) locks the wire claims:
HEADER_1, ctx=0xfe, dest=link_id, body decrypts under
derived_key to msgpack float64 matching rtt_seconds.
Citations all verified against installed RNS 1.2.4 / LXMF 0.9.7.
All 14 verifiers PASS.
45 lines
3.1 KiB
Markdown
45 lines
3.1 KiB
Markdown
# Verifier scripts
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Self-contained Python scripts that test claims in [`../SPEC.md`](../SPEC.md) against the upstream RNS / LXMF Python stack.
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## Conventions
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- Each script verifies one claim or one related cluster of claims.
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- Exit code 0 on PASS, non-zero on FAIL.
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- Print a one-line PASS/FAIL summary plus a unified diff or hex dump on mismatch.
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- Reference the SPEC.md section the script verifies in a docstring at the top.
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## Required environment
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```
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pip install rns lxmf
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```
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The scripts read `RNS.__version__` at startup and print it in their output so a future reader can tell which RNS version a verification ran against.
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## Status
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Populated against RNS 1.2.4 / LXMF 0.9.7:
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| Script | Verifies SPEC.md section | Status |
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| `verify_destination_hash.py` | §1.1, §1.2, §1.3 — identity composition, `dest_hash = SHA256(name_hash \|\| identity_hash)[:16]`, on-disk private-key round-trip via `to_file`/`from_file` | ✅ |
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| `verify_packet_header.py` | §2.1, §2.2, §2.3 — flag byte layout, HEADER_1/HEADER_2 form, originator HEADER_1→HEADER_2 conversion via upstream `Transport.outbound` | ✅ |
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| `verify_token_crypto.py` | §3 — Token encrypt/decrypt, HKDF salt = identity_hash, HMAC-then-AES order, PKCS#7 padding | ✅ |
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| `verify_announce_app_data.py` | §4.3 — LXMF announce app_data 2-element form, parser tolerance | ✅ |
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| `verify_announce_roundtrip.py` | §4.1, §4.2, §4.5 — announce body layout, signature, dest_hash recompute, tamper rejection | ✅ |
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| `verify_lxmf_opportunistic.py` | §5.1, §5.2, §5.5, §5.6 — full identity → encrypt → decrypt → parse round-trip | ✅ |
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| `verify_proof_packet.py` | §6.5 — implicit (64B) and explicit (96B) proof body forms, validator length-dispatch | ✅ |
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| `verify_link_handshake.py` | §6.1, §6.2, §6.3, §6.6 — LINKREQUEST/LRPROOF body order, link_id derivation, signalling | ✅ |
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| `verify_link_lrrtt.py` | §6.4.2, §6.4.3 — LRRTT wire form, HEADER_1 header, dest_type=LINK, ctx=0xfe, link-form Token body, msgpack float64 plaintext | ✅ |
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| `verify_path_request.py` | §1.2 well-known hashes, §7.1 LXMF path-preamble gating | ✅ |
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| `verify_rnode_split.py` | §8.3 — RNode air-frame split-packet TX/RX state machines | ✅ |
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| `verify_msgpack_quirk.py` | §9.3 — encoding name as bytes vs str affects upstream parsing | ✅ |
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| `verify_stamps.py` | §5.7 — workblock determinism, PoW stamp search/validate, ticket shortcut | ✅ |
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| `verify_ratchet_dedup.py` | §7.3 / §4.5 step 6.3 — confirms replay defence is keyed on `random_blob`, NOT on `(dest_hash, ratchet_pub)` | ✅ |
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| `regen_identities.py` | regenerates `test-vectors/identities.json` | ✅ |
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| `regen_announces.py` | regenerates `test-vectors/announces.json` (deterministic announce wire bytes, with and without ratchet) | ✅ |
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| `regen_lxmf.py` | regenerates `test-vectors/lxmf.json` (deterministic opportunistic-LXMF plaintext + Token ciphertext) | ✅ |
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| `regen_links.py` | regenerates `test-vectors/links.json` (deterministic LINKREQUEST + LRPROOF + derived session key) | ✅ |
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See [`../agent.md`](../agent.md) §5 and [`../todo.md`](../todo.md) for the remaining priority order.
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