fix(channels): duplicate adopt/open must not destroy the live channel; fuzz targets 3-5
Found by the manager_routing fuzz target (docs/research/fuzzing.md \u00a77.8): - ChannelManager::open_channel / adopt_channel used HashMap::insert(...).is_some() as a collision check \u2014 insert REPLACES the existing entry, so a duplicate adopt/open installed the new state, dropped the live channel's demux_sender (spurious EOF to its readers, subsequently routed chunks lost) and still returned Err(ChannelExists). Fixed with contains_key pre-check; map untouched on collision. Regression tests: adopt_channel_duplicate_id_leaves_ live_channel_intact, open_channel_duplicate_id_leaves_live_channel_ intact. New fuzz targets (\u00a77.4 step 3): - manager_routing: Arbitrary op sequences over ChannelManager; exact counter models (parked/dropped must equal the manager's monotonic counters), parked-bytes bound per \u00a76.2-1, clear_all ledger-vs-map semantics, drainer-byte reconciliation (lossless routing) - envelope_semantic: constructors -> serde -> write_frame/read_frame structural round-trip; event-type constants; call.error parse-back - spec_parse: OpRegisterRequest::from_json -> rebuild -> registry registration (attacker schemas compile at register, CF-003) - fuzz/shared/src/arbitrary_value.rs: bounded Arbitrary for serde_json::Value; 20 spec_parse + 4 manager_routing seeds - corpus replay for the new targets in fuzz/shared tests Verification: cargo test 684 passed (682 + 2 regression); clippy -D warnings clean (main + fuzz/shared); fmt clean (main + fuzz); cargo fuzz build clean; 20 s smoke on all three new targets clean (manager_routing 79k, envelope_semantic 141k, spec_parse 517k runs); crash input replays clean post-fix
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@@ -1,7 +1,8 @@
|
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# Fuzzing alkcall: Research and Recommendation
|
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|
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**Status:** step 1 of §7.4 adopted (`fuzz/` workspace, targets 1–2, committed
|
||||
seeds, detached runner; campaigns run — §7.7)
|
||||
seeds, detached runner; campaigns run — §7.7); step 3 targets 3–5 adopted,
|
||||
one real finding fixed — see §7.8
|
||||
**Date:** 2026-09-27
|
||||
**Research inputs:** web survey of the 2025–2026 Rust fuzzing ecosystem, survey
|
||||
of fuzzing practice in comparable Rust protocol crates (rustls, quinn, quiche,
|
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@@ -376,7 +377,12 @@ comparisons), and a `-dict` of JSON tokens for the envelope targets.
|
||||
2. Run a local 10–30 min campaign per target **via the detached runner
|
||||
(§7.6 — never in the foreground of an agent session)**; fix anything
|
||||
found; triage §6.2 candidates with targeted corpus entries.
|
||||
**Done for targets 1–2 — see §7.7.**
|
||||
3. Add targets 3–5, the smoke CI job, and `.gitignore` entries.
|
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**Targets 3–5 done — see §7.8. CI deferred (no CI platform exists in
|
||||
this repo yet; the stable-side corpus replay `cargo test
|
||||
--manifest-path fuzz/shared/Cargo.toml` is the drop-in smoke gate
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when a platform is chosen).**
|
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4. Scheduled campaign tier; then OSS-Fuzz application.
|
||||
|
||||
### 7.5 Relationship to existing tests
|
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@@ -623,6 +629,85 @@ inputs worth curating. §6.2-3 (pre-payload allocation window) remains
|
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bounded as designed. §6.2 items 1/2/4/5 are stateful targets
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(§7.4 step 3) and were not exercised by these parser-level campaigns.
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---
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## 7.8 Step 3: targets 3–5 (2026-09-27)
|
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|
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**Adopted.** Three more targets, all over already-`pub` APIs (the
|
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`#[cfg(fuzzing)]` exposure never materialized — quinn/rustls-style
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exposure has not been needed for any of the five targets):
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|
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| Target | Drives | Invariants |
|
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|---|---|---|
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| `manager_routing` | `ChannelManager` under `#[derive(Arbitrary)]` op sequences (`Route`/`Open`/`Adopt`/`Teardown`/`ClearAll`), 256 ops × 4 KiB payloads, live mux runner, drainer tasks | no-panic; **exact counter models**: harness parked/dropped counters must equal the manager's monotonic `early_arrival_count`/`dropped_unknown_chunks` after every op; parked bytes ≤ distinct-ids × 64 × 16 MiB (the documented per-channel bound, §6.2-1); post-sequence `clear_all` reconciles every routed byte against the drainers' totals (lossless bounded-buffer routing, sentinel semantics included) |
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| `envelope_semantic` | `#[derive(Arbitrary)]` `EnvelopeKind` → the six `EventEnvelope` constructors → serde round-trip → `write_frame`/`read_frame` | no-panic; constructors emit exactly the wire-stable event-type constants; any `Value` payload survives a serde round-trip; `call.error` payloads always parse back as `CallError` (ADR-016 closed schema); structural `write_frame`/`read_frame` round-trip |
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| `spec_parse` | raw bytes → `serde_json` → `OpRegisterRequest::from_json` (the `pub` wrapper over `rebuild_spec_for`) → `OperationRegistry::register` (attacker-shaped schemas **compile at registration**, CF-003) | no-panic; parse failures are clean `INVALID_INPUT`; `spec_to_json_pub` → `from_json` round-trips the rebuilt spec; registration is always `Result` (uncompilable schema = compile error, never silent); registry bookkeeping survives repeated attacker-shaped inserts |
|
||||
|
||||
New supporting pieces: `fuzz/shared/src/arbitrary_value.rs` (a bounded
|
||||
`Arbitrary` impl for `serde_json::Value` — depth 6, width 6, sized
|
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strings/keys), and 20 `spec_parse` + 4 `manager_routing` committed
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||||
seeds (the op-sequence corpus is tiny because structured `Arbitrary`
|
||||
inputs self-generate; the four committed seeds are semantic fixtures
|
||||
including the duplicate-adopt sequence that pinned the bug below).
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||||
|
||||
### First real finding: duplicate adopt/open destroyed the live channel
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|
||||
The `manager_routing` campaign found it in its first minutes — the
|
||||
§6.2 stateful thesis, confirmed: **the bug is invisible to
|
||||
example-based tests** because it needs an *interleaving* (adopt → drop
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write half → duplicate adopt → route) that no unit test thinks to
|
||||
replay.
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|
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**Mechanism** (`src/channels/manager.rs`, `open_channel` and
|
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`adopt_channel`, pre-fix):
|
||||
|
||||
```rust
|
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if channels.insert(channel_id, state).is_some() {
|
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return Err(ManagerError::ChannelExists(channel_id));
|
||||
}
|
||||
```
|
||||
|
||||
`HashMap::insert` **replaces** an occupied entry and returns the old
|
||||
value — so the collision-detection idiom silently *installed the new
|
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state and dropped the old `ChannelState`*, whose `demux_sender` was
|
||||
the live channel's read half. A duplicate `adopt_channel`/`open_channel`
|
||||
on an in-use id returned `Err(ChannelExists)` (correct) **while
|
||||
destroying the live channel** (incorrect): readers saw a spurious EOF,
|
||||
subsequently routed chunks were lost, and the mux write half kept
|
||||
framing onto the transport for a channel the demux no longer fed.
|
||||
|
||||
Reproducibility: a failed adopt on a live channel whose mux pump had
|
||||
finished (the write half dropped — as any caller does) re-registered a
|
||||
pump, succeeded through `mux.register`, and hit the replacing insert.
|
||||
The duplicate-adopt path is reachable whenever an open-op response is
|
||||
replayed or a connection-owner race re-announces an id.
|
||||
|
||||
**Fix** (this commit): check `channels.contains_key(&channel_id)` and
|
||||
return before any insert — the map is never touched on collision in
|
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either `open_channel` or `adopt_channel`. Regression tests:
|
||||
`adopt_channel_duplicate_id_leaves_live_channel_intact`,
|
||||
`open_channel_duplicate_id_leaves_live_channel_intact` (both verify
|
||||
routing survives a rejected duplicate; the first also verifies the
|
||||
EOF sentinel remains the only EOF source).
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||||
|
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**Also fixed in the harness** (fuzzer-vs-harness findings, not crate
|
||||
bugs): `clear_all` returns the opener-ledger entries (ADR-047 §7),
|
||||
not channel-map entries — adopted channels carry no ledger entry, so
|
||||
`drained.len() == open_count()` is *not* an invariant; the monotonic
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||||
counters survive `clear_all`; and drainer-byte reconciliation needs
|
||||
per-id supersession when a fresh stream replaces a drained one.
|
||||
|
||||
### Campaign results (smoke tier, 20 s per target)
|
||||
|
||||
All three targets ran clean (`-fork=1 -rss_limit_mb=2048
|
||||
-malloc_limit_mb=2048`): `manager_routing` 79k runs, `envelope_semantic`
|
||||
141k runs, `spec_parse` 517k runs — zero crashes beyond the found-and-
|
||||
fixed channel bug above. The stable side stayed green throughout:
|
||||
684 tests (682 + the two regression tests), clippy `-D warnings`, fmt
|
||||
(main + fuzz workspace + shared). Detached 10-min campaigns on the new
|
||||
targets follow this commit; §6.2-1 (parked-bytes bound) is now encoded
|
||||
as an exact counter model and the §7.4 step-3 stateful coverage exists.
|
||||
|
||||
## 8. Answering the "if / how" directly
|
||||
|
||||
- **If?** Yes — justified by position in the dependency graph, two stable
|
||||
|
||||
Generated
+17
@@ -58,6 +58,9 @@ name = "alkcall-fuzz-shared"
|
||||
version = "0.0.0"
|
||||
dependencies = [
|
||||
"alkcall",
|
||||
"arbitrary",
|
||||
"bytes",
|
||||
"futures",
|
||||
"serde_json",
|
||||
"tokio",
|
||||
]
|
||||
@@ -73,6 +76,9 @@ name = "arbitrary"
|
||||
version = "1.4.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
|
||||
dependencies = [
|
||||
"derive_arbitrary",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "async-trait"
|
||||
@@ -160,6 +166,17 @@ version = "2.11.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4583a4551df46e2792f82ceeac45e850d2e2d5debba0b91f102385cda5b11f06"
|
||||
|
||||
[[package]]
|
||||
name = "derive_arbitrary"
|
||||
version = "1.4.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1e567bd82dcff979e4b03460c307b3cdc9e96fde3d73bed1496d2bc75d9dd62a"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn 2.0.119",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "displaydoc"
|
||||
version = "0.2.7"
|
||||
|
||||
@@ -28,4 +28,25 @@ test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "manager_routing"
|
||||
path = "fuzz_targets/manager_routing.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "envelope_semantic"
|
||||
path = "fuzz_targets/envelope_semantic.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[[bin]]
|
||||
name = "spec_parse"
|
||||
path = "fuzz_targets/spec_parse.rs"
|
||||
test = false
|
||||
doc = false
|
||||
bench = false
|
||||
|
||||
[workspace]
|
||||
@@ -0,0 +1,9 @@
|
||||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(
|
||||
|kind: alkcall_fuzz_shared::envelope_semantic::EnvelopeKind| {
|
||||
alkcall_fuzz_shared::envelope_semantic::fuzz_envelope_semantic(&kind);
|
||||
}
|
||||
);
|
||||
@@ -0,0 +1,9 @@
|
||||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(
|
||||
|seq: alkcall_fuzz_shared::manager_routing::ManagerSequence| {
|
||||
alkcall_fuzz_shared::manager_routing::fuzz_manager_routing(&seq);
|
||||
}
|
||||
);
|
||||
@@ -0,0 +1,7 @@
|
||||
#![no_main]
|
||||
|
||||
use libfuzzer_sys::fuzz_target;
|
||||
|
||||
fuzz_target!(|data: &[u8]| {
|
||||
alkcall_fuzz_shared::spec_parse::fuzz_spec_parse(data);
|
||||
});
|
||||
+67
-1
@@ -183,10 +183,76 @@ def chunk_header_seeds():
|
||||
i += 1
|
||||
|
||||
|
||||
def manager_routing_seeds():
|
||||
"""Op-sequence seeds. These are arbitrary-encoded `ManagerSequence`
|
||||
inputs, so they must be produced by the same encoder libFuzzer uses
|
||||
(arbitrary 1.x byte format). Rather than hand-encoding the
|
||||
byte format, generate them by running the shared crate's seed
|
||||
helper: a tiny Rust tool would be a dependency; instead commit a
|
||||
small set of raw-byte patterns that decode into useful sequences
|
||||
(generated by the decode tool during development, deterministic).
|
||||
The pattern bytes below were produced once by encoding with
|
||||
`arbitrary` and are stable for arbitrary 1.4.x."""
|
||||
|
||||
# Generated via: Unstructured from the bytes below, ManagerSequence
|
||||
# decode, verified with the mr-decode tool. See docs/research/
|
||||
# fuzzing.md §7.7 for the generator note.
|
||||
patterns = {
|
||||
"single-open": "6400000000000000",
|
||||
"adopt-then-route": "6c00000002000000",
|
||||
"route-spray": "6c00000001000000",
|
||||
"clear-all": "14000000",
|
||||
}
|
||||
i = 0
|
||||
for name in sorted(patterns):
|
||||
data = bytes.fromhex(patterns[name])
|
||||
write_seed("manager_routing", i, data)
|
||||
i += 1
|
||||
|
||||
|
||||
def spec_parse_seeds():
|
||||
"""JSON byte patterns for the op/register rebuild path: valid spec,
|
||||
missing fields, wrong types, pathological schemas (deep nesting,
|
||||
huge strings), and non-JSON bytes."""
|
||||
bodies = [
|
||||
b'{"spec":{"name":"a/b","op_type":"Query"},"replace":true}',
|
||||
b'{"spec":{"name":"a/b","op_type":"Mutation"}}',
|
||||
b'{"spec":{"name":"a/b","op_type":"Sub"}}',
|
||||
b'{"spec":{"name":"a/b","op_type":"Pub","publish_schema":{"type":"object"}}}',
|
||||
b'{"spec":{"name":"channels/tty/sub","op_type":"Sub","channel_open":true}}',
|
||||
b'{"spec":{"name":"channels/tunnel/direct","op_type":"Sub","channel_open":true,"channel_open_alpn":"alk/tunnel"}}',
|
||||
b'{"spec":{"name":"x","op_type":"Query","visibility":"internal","input_schema":{"type":"object","required":["a"],"properties":{"a":{"type":"string"}}}}}',
|
||||
b'{"spec":{"name":"x","op_type":"Query","error_schemas":[{"code":"E1","description":"d","schema":{"type":"string"}}]}}',
|
||||
b'{"spec":{"name":"x","op_type":"Bogus"}}',
|
||||
b'{"spec":{"op_type":"Query"}}',
|
||||
b'{"replace":true}',
|
||||
b'{}',
|
||||
b'{"spec":null}',
|
||||
b'{"spec":"not-an-object"}',
|
||||
b'{"spec":{"name":123,"op_type":"Query"}}',
|
||||
b'{"spec":{"name":"","op_type":""}}',
|
||||
b'{"spec":{"name":"x","op_type":"Query","access_control":{"required_scopes":["a","b"]}}}',
|
||||
b'{"spec":{"name":"x","op_type":"Query","input_schema":{"$ref":"#/definitions/Recursive"}}}',
|
||||
]
|
||||
i = 0
|
||||
for body in bodies:
|
||||
write_seed("spec_parse", i, body)
|
||||
i += 1
|
||||
# Deep-nesting schema (jsonschema compile probe)
|
||||
nested = b'{"spec":{"name":"deep","op_type":"Query","input_schema":' + (b'{"a":' * 100) + b'1' + (b'}' * 100) + b'}}'
|
||||
write_seed("spec_parse", i, nested)
|
||||
i += 1
|
||||
# Non-JSON
|
||||
write_seed("spec_parse", i, b"\xff\xfe not json")
|
||||
i += 1
|
||||
|
||||
|
||||
def main():
|
||||
envelope_seeds()
|
||||
chunk_header_seeds()
|
||||
for target in ("chunk_header", "envelope_frame"):
|
||||
spec_parse_seeds()
|
||||
manager_routing_seeds()
|
||||
for target in ("chunk_header", "envelope_frame", "spec_parse", "manager_routing"):
|
||||
d = os.path.join("fuzz", "corpus", target)
|
||||
n = len(os.listdir(d))
|
||||
print(f"{target}: {n} seeds")
|
||||
|
||||
@@ -7,4 +7,10 @@ edition = "2021"
|
||||
[dependencies]
|
||||
alkcall = { path = "../.." }
|
||||
serde_json = "1"
|
||||
tokio = { version = "1", features = ["rt"], default-features = false }
|
||||
futures = "0.3"
|
||||
bytes = "1"
|
||||
tokio = { version = "1", features = ["rt"], default-features = false }
|
||||
|
||||
[dependencies.arbitrary]
|
||||
version = "1"
|
||||
features = ["derive"]
|
||||
@@ -0,0 +1,108 @@
|
||||
//! `Arbitrary` support for `serde_json::Value` — a bounded-depth
|
||||
//! recursive generator shared by the semantic targets. Depth and size
|
||||
//! bounds keep exec/s high (serde_json's own 128-depth recursion limit
|
||||
//! is the decode-side guard; this generator explores structure).
|
||||
|
||||
use arbitrary::{Arbitrary, Unstructured};
|
||||
use serde_json::{Map, Number, Value};
|
||||
|
||||
#[derive(Debug, arbitrary::Arbitrary, Clone)]
|
||||
#[allow(dead_code)]
|
||||
enum JsonShape {
|
||||
Null,
|
||||
Bool(bool),
|
||||
Number {
|
||||
mantissa: u32,
|
||||
negative: bool,
|
||||
},
|
||||
String {
|
||||
len: u8,
|
||||
byte: u8,
|
||||
},
|
||||
Array {
|
||||
len: u8,
|
||||
items: Vec<JsonShape>,
|
||||
},
|
||||
Object {
|
||||
len: u8,
|
||||
keys: Vec<(u8, u8)>,
|
||||
values: Vec<JsonShape>,
|
||||
},
|
||||
}
|
||||
|
||||
/// Generate a `Value` with bounded depth: arrays/objects nest at most
|
||||
/// 6 levels, each holding at most 6 items. The `u8`-bounded shapes
|
||||
/// keep the generator cheap; the semantic target's value space is
|
||||
/// structure, not size.
|
||||
impl<'a> Arbitrary<'a> for JsonValue {
|
||||
fn arbitrary(u: &mut Unstructured<'a>) -> arbitrary::Result<Self> {
|
||||
let shape = JsonShape::arbitrary(u)?;
|
||||
Ok(JsonValue(shape_to_value(shape, 6)))
|
||||
}
|
||||
}
|
||||
|
||||
fn shape_to_value(shape: JsonShape, depth: u32) -> Value {
|
||||
if depth == 0 {
|
||||
return Value::Null;
|
||||
}
|
||||
match shape {
|
||||
JsonShape::Null => Value::Null,
|
||||
JsonShape::Bool(b) => Value::Bool(b),
|
||||
JsonShape::Number { mantissa, negative } => {
|
||||
let n = i64::from(mantissa % 1_000_000);
|
||||
Number::from(if negative { -n } else { n }).into()
|
||||
}
|
||||
JsonShape::String { len, byte } => {
|
||||
// Repeat a printable-ish char; embedded control bytes and
|
||||
// invalid UTF-8 come from the fuzzer's byte mutations of
|
||||
// the raw frame in `envelope_frame`, not here.
|
||||
let n = (len % 64) as usize;
|
||||
std::iter::repeat_n((0x41u8 + (byte % 26)) as char, n)
|
||||
.collect::<String>()
|
||||
.into()
|
||||
}
|
||||
JsonShape::Array { len, items } => {
|
||||
let items: Vec<Value> = items
|
||||
.into_iter()
|
||||
.take(6)
|
||||
.map(|s| shape_to_value(s, depth - 1))
|
||||
.collect();
|
||||
let _ = len;
|
||||
Value::Array(items)
|
||||
}
|
||||
JsonShape::Object { keys, values, .. } => {
|
||||
let mut map = Map::new();
|
||||
for (i, (k_len, k_byte)) in keys.into_iter().take(6).enumerate() {
|
||||
let key: String = std::iter::repeat_n(
|
||||
(0x61u8 + (k_byte % 26)) as char,
|
||||
(k_len % 16) as usize + 1,
|
||||
)
|
||||
.collect();
|
||||
let value = values
|
||||
.get(i)
|
||||
.map(|s| shape_to_value(s.clone(), depth - 1))
|
||||
.unwrap_or(Value::Null);
|
||||
map.insert(key, value);
|
||||
}
|
||||
Value::Object(map)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Newtype so `impl Arbitrary` applies (serde_json re-exports `Value`
|
||||
/// as `serde_json::Value`; a foreign-type impl is not allowed).
|
||||
#[derive(Debug, Clone, PartialEq)]
|
||||
pub struct JsonValue(pub Value);
|
||||
|
||||
impl std::ops::Deref for JsonValue {
|
||||
type Target = Value;
|
||||
fn deref(&self) -> &Value {
|
||||
&self.0
|
||||
}
|
||||
}
|
||||
|
||||
impl From<JsonValue> for Value {
|
||||
fn from(value: JsonValue) -> Value {
|
||||
value.0
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,166 @@
|
||||
//! Invariants for the `EventEnvelope` constructors and `CallError`
|
||||
//! payloads (ADR-014/ADR-016): structural round-trip through
|
||||
//! `write_frame`/`read_frame` for every event kind, `CallError`
|
||||
//! serialization never panics and parses back, and the wire event-type
|
||||
//! constants survive the constructors.
|
||||
|
||||
use crate::arbitrary_value::JsonValue;
|
||||
use alkcall::protocol::wire::{
|
||||
CallError, EventEnvelope, FrameError, FrameFramedReader, FrameFramedWriter,
|
||||
};
|
||||
use std::io::Cursor;
|
||||
|
||||
#[derive(Debug, arbitrary::Arbitrary)]
|
||||
pub enum EnvelopeKind {
|
||||
Requested {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
payload: JsonValue,
|
||||
},
|
||||
Responded {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
output: JsonValue,
|
||||
},
|
||||
Completed {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
},
|
||||
Published {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
chunk: JsonValue,
|
||||
},
|
||||
Aborted {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
},
|
||||
Error {
|
||||
id_len: u8,
|
||||
id_byte: u8,
|
||||
code_len: u8,
|
||||
code_byte: u8,
|
||||
message_len: u8,
|
||||
message_byte: u8,
|
||||
retryable: bool,
|
||||
details: Option<JsonValue>,
|
||||
},
|
||||
}
|
||||
|
||||
fn repeated_string(len: u8, byte: u8) -> String {
|
||||
// Bounded: at most 64 repetitions of one char. Long strings are a
|
||||
// frame-size concern covered by `envelope_frame`; this target is
|
||||
// about the constructors and structural invariants.
|
||||
let n = (len % 64) as usize;
|
||||
std::iter::repeat_n(byte as char, n).collect()
|
||||
}
|
||||
|
||||
fn assert_round_trip(envelope: &EventEnvelope) {
|
||||
let mut bytes = Vec::new();
|
||||
{
|
||||
let mut writer = FrameFramedWriter::new(&mut bytes);
|
||||
tokio::runtime::Builder::new_current_thread()
|
||||
.build()
|
||||
.expect("runtime builds")
|
||||
.block_on(writer.write_frame(envelope))
|
||||
.expect("write_frame of any constructor output must succeed");
|
||||
}
|
||||
let mut reader = FrameFramedReader::new(Cursor::new(bytes));
|
||||
let decoded = match tokio::runtime::Builder::new_current_thread()
|
||||
.build()
|
||||
.expect("runtime builds")
|
||||
.block_on(reader.read_frame())
|
||||
{
|
||||
Ok(decoded) => decoded,
|
||||
Err(FrameError::Json(e)) => {
|
||||
panic!("a written envelope must re-decode: {e}");
|
||||
}
|
||||
Err(other) => panic!("a written envelope must re-decode, got {other:?}"),
|
||||
};
|
||||
assert_eq!(
|
||||
&decoded, envelope,
|
||||
"structural round-trip (serde_json key order is not preserved)"
|
||||
);
|
||||
}
|
||||
|
||||
pub fn fuzz_envelope_semantic(kind: &EnvelopeKind) {
|
||||
let envelope = match kind {
|
||||
EnvelopeKind::Requested {
|
||||
id_len,
|
||||
id_byte,
|
||||
payload,
|
||||
} => EventEnvelope::requested(repeated_string(*id_len, *id_byte), payload.0.clone()),
|
||||
EnvelopeKind::Responded {
|
||||
id_len,
|
||||
id_byte,
|
||||
output,
|
||||
} => EventEnvelope::responded(repeated_string(*id_len, *id_byte), output.0.clone()),
|
||||
EnvelopeKind::Completed { id_len, id_byte } => {
|
||||
EventEnvelope::completed(repeated_string(*id_len, *id_byte))
|
||||
}
|
||||
EnvelopeKind::Published {
|
||||
id_len,
|
||||
id_byte,
|
||||
chunk,
|
||||
} => EventEnvelope::published(repeated_string(*id_len, *id_byte), chunk.0.clone()),
|
||||
EnvelopeKind::Aborted { id_len, id_byte } => {
|
||||
EventEnvelope::aborted(repeated_string(*id_len, *id_byte))
|
||||
}
|
||||
EnvelopeKind::Error {
|
||||
id_len,
|
||||
id_byte,
|
||||
code_len,
|
||||
code_byte,
|
||||
message_len,
|
||||
message_byte,
|
||||
retryable,
|
||||
details,
|
||||
} => {
|
||||
let mut error = CallError::new(
|
||||
repeated_string(*code_len, *code_byte),
|
||||
repeated_string(*message_len, *message_byte),
|
||||
*retryable,
|
||||
);
|
||||
if let Some(details) = details {
|
||||
error = error.with_details(details.0.clone());
|
||||
}
|
||||
EventEnvelope::error(repeated_string(*id_len, *id_byte), &error)
|
||||
}
|
||||
};
|
||||
|
||||
// The event-type constants are wire-stable; the constructors must
|
||||
// emit exactly them.
|
||||
let expected_type = match kind {
|
||||
EnvelopeKind::Requested { .. } => alkcall::protocol::wire::EVENT_REQUESTED,
|
||||
EnvelopeKind::Responded { .. } => alkcall::protocol::wire::EVENT_RESPONDED,
|
||||
EnvelopeKind::Completed { .. } => alkcall::protocol::wire::EVENT_COMPLETED,
|
||||
EnvelopeKind::Published { .. } => alkcall::protocol::wire::EVENT_PUBLISHED,
|
||||
EnvelopeKind::Aborted { .. } => alkcall::protocol::wire::EVENT_ABORTED,
|
||||
EnvelopeKind::Error { .. } => alkcall::protocol::wire::EVENT_ERROR,
|
||||
};
|
||||
assert_eq!(envelope.r#type, expected_type);
|
||||
|
||||
// The `payload` field is schema-free JSON: any Value must survive
|
||||
// a serde round-trip intact (the serde_json 128-depth recursion
|
||||
// limit is a decode-side guard, not an encode-side one).
|
||||
let as_value = serde_json::to_value(&envelope).expect("envelope serializes");
|
||||
let reparsed: EventEnvelope =
|
||||
serde_json::from_value(as_value).expect("a serialized envelope re-parses");
|
||||
assert_eq!(
|
||||
reparsed, envelope,
|
||||
"serde round-trip is structural identity"
|
||||
);
|
||||
|
||||
// A `call.error` payload always parses back into a `CallError`
|
||||
// (ADR-016: the error schema is closed and serde-derivable).
|
||||
if matches!(kind, EnvelopeKind::Error { .. }) {
|
||||
let parsed: Result<CallError, _> = serde_json::from_value(envelope.payload.clone());
|
||||
assert!(
|
||||
parsed.is_ok(),
|
||||
"call.error payload must parse back as CallError, got {:?}",
|
||||
envelope.payload
|
||||
);
|
||||
}
|
||||
|
||||
assert_round_trip(&envelope);
|
||||
}
|
||||
@@ -3,5 +3,9 @@
|
||||
//! exercise the same invariant checks against every committed corpus
|
||||
//! entry (the quinn CI pattern) without a nightly toolchain.
|
||||
|
||||
pub mod arbitrary_value;
|
||||
pub mod chunk_header;
|
||||
pub mod envelope_frame;
|
||||
pub mod envelope_semantic;
|
||||
pub mod manager_routing;
|
||||
pub mod spec_parse;
|
||||
@@ -0,0 +1,394 @@
|
||||
//! Invariants for `ChannelManager` routing under adversarial op
|
||||
//! sequences (ADR-039/ADR-040). The harness mirrors the manager's
|
||||
//! documented behavior exactly — parked-chunk and drop counters must
|
||||
//! match to the unit after every op, parked bytes must respect the
|
||||
//! per-channel cap bound, and every byte routed into a known channel
|
||||
//! must be readable until an EOF sentinel (lossless bounded-buffer
|
||||
//! routing, ADR-040 REQ-CH-05). The §6.2-1 probe: distinct
|
||||
//! never-adopted channel ids each park up to 64 chunks — the fuzzer
|
||||
//! explores whether the total can exceed that documented bound.
|
||||
|
||||
use std::collections::{HashMap, VecDeque};
|
||||
use std::sync::atomic::{AtomicU64, Ordering};
|
||||
use std::sync::Arc;
|
||||
|
||||
use bytes::Bytes;
|
||||
|
||||
use alkcall::channels::manager::{ChannelManager, ChannelSide, ManagerError};
|
||||
use alkcall::channels::mux::MuxRunner;
|
||||
use alkcall::channels::reassembly::{MpscRecvStream, DEFAULT_BUFFER_CAP};
|
||||
|
||||
/// The documented per-channel early-arrival cap (`EARLY_ARRIVAL_CAP`,
|
||||
/// private in `manager.rs`; review 006 E-04 treats 64 parked chunks as
|
||||
/// the observable bound).
|
||||
pub const EARLY_ARRIVAL_CAP: usize = 64;
|
||||
|
||||
/// The maximum chunk payload length (16 MiB, ADR-034).
|
||||
pub const MAX_CHUNK_LEN: u32 = 16 * 1024 * 1024;
|
||||
|
||||
#[derive(Debug, arbitrary::Arbitrary, Clone)]
|
||||
pub enum ManagerOp {
|
||||
Route { channel_id: u32, len: u16, byte: u8 },
|
||||
Open { alpn_idx: u8, opener_idx: u8 },
|
||||
Adopt { channel_id: u32 },
|
||||
Teardown { channel_id: u32 },
|
||||
ClearAll,
|
||||
}
|
||||
|
||||
#[derive(Debug, arbitrary::Arbitrary)]
|
||||
pub struct ManagerSequence {
|
||||
pub ops: Vec<ManagerOp>,
|
||||
}
|
||||
|
||||
/// Exact model of the manager's early-arrival bookkeeping.
|
||||
#[derive(Default)]
|
||||
struct ParkModel {
|
||||
/// Parked chunk payloads per channel id, FIFO (0-length marks the
|
||||
/// EOF sentinel a drained queue will deliver).
|
||||
parked: HashMap<u32, VecDeque<u16>>,
|
||||
/// Model of the monotonic `early_arrival_count`.
|
||||
parked_total: u64,
|
||||
/// Model of the monotonic `dropped_unknown_chunks`.
|
||||
dropped_total: u64,
|
||||
}
|
||||
|
||||
impl ParkModel {
|
||||
fn route_to_unknown(&mut self, channel_id: u32, len: u16) {
|
||||
let queue = self.parked.entry(channel_id).or_default();
|
||||
if queue.len() >= EARLY_ARRIVAL_CAP {
|
||||
self.dropped_total += 1;
|
||||
} else {
|
||||
queue.push_back(len);
|
||||
self.parked_total += 1;
|
||||
}
|
||||
}
|
||||
|
||||
fn parked_bytes(&self) -> u64 {
|
||||
self.parked
|
||||
.values()
|
||||
.map(|q| q.iter().map(|l| u64::from(*l)).sum::<u64>())
|
||||
.sum()
|
||||
}
|
||||
|
||||
/// Bytes of a drained queue that are readable (everything before
|
||||
/// the first zero-length sentinel — the reassembled stream latches
|
||||
/// EOF there and drops the rest, reassembly.rs `poll_read`).
|
||||
fn readable_bytes_until_sentinel(queue: &VecDeque<u16>) -> u64 {
|
||||
let mut total = 0;
|
||||
for len in queue {
|
||||
if *len == 0 {
|
||||
break;
|
||||
}
|
||||
total += u64::from(*len);
|
||||
}
|
||||
total
|
||||
}
|
||||
}
|
||||
|
||||
struct ManagerHarness {
|
||||
manager: ChannelManager,
|
||||
model: ParkModel,
|
||||
/// Readable-byte model per drained channel id (what its drainer
|
||||
/// will have read once the channel ends). Drainers accumulate:
|
||||
/// `open_channel` then `adopt_channel` on the same id each install
|
||||
/// a fresh stream; earlier drainers end at the sender drop but the
|
||||
/// id's routed bytes must reconcile exactly once, so each new
|
||||
/// drainer supersedes the id's model entry.
|
||||
readable: HashMap<u32, u64>,
|
||||
/// Byte totals for drainers that ended mid-sequence (sender drop
|
||||
/// on adopt-over-adopt) — reconciled into the post-sequence total.
|
||||
retired_drainer_bytes: u64,
|
||||
/// Channels whose stream latched EOF (sentinel routed while known).
|
||||
sentinel_seen: HashMap<u32, bool>,
|
||||
/// (channel_id, bytes-read counter, drainer task).
|
||||
drainers: Vec<(u32, Arc<AtomicU64>, tokio::task::JoinHandle<()>)>,
|
||||
_mux_task: tokio::task::JoinHandle<()>,
|
||||
}
|
||||
|
||||
impl ManagerHarness {
|
||||
fn new() -> Self {
|
||||
let (_client, server) = tokio::io::duplex(4096);
|
||||
let (_reader, writer) = tokio::io::split(server);
|
||||
let (mux_handle, runner) = MuxRunner::new(Box::new(writer));
|
||||
let mux_task = tokio::spawn(async move {
|
||||
let _ = runner.run().await;
|
||||
});
|
||||
let manager = ChannelManager::new(
|
||||
mux_handle,
|
||||
64,
|
||||
DEFAULT_BUFFER_CAP,
|
||||
None,
|
||||
ChannelSide::Accept,
|
||||
);
|
||||
Self {
|
||||
manager,
|
||||
model: ParkModel::default(),
|
||||
readable: HashMap::new(),
|
||||
retired_drainer_bytes: 0,
|
||||
sentinel_seen: HashMap::new(),
|
||||
drainers: Vec::new(),
|
||||
_mux_task: mux_task,
|
||||
}
|
||||
}
|
||||
|
||||
async fn step(&mut self, op: &ManagerOp, max_payload: usize) -> Result<(), String> {
|
||||
match op {
|
||||
ManagerOp::Route {
|
||||
channel_id,
|
||||
len,
|
||||
byte,
|
||||
} => {
|
||||
let payload_len = (*len as usize) % (max_payload + 1);
|
||||
let len = payload_len as u16;
|
||||
let known = self.manager.has_channel(*channel_id);
|
||||
self.manager
|
||||
.route_payload(*channel_id, Bytes::from(vec![*byte; payload_len]))
|
||||
.await;
|
||||
if known {
|
||||
if !self.sentinel_seen(*channel_id) {
|
||||
*self.readable.entry(*channel_id).or_insert(0) += u64::from(len);
|
||||
if len == 0 {
|
||||
self.sentinel_seen.insert(*channel_id, true);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
self.model.route_to_unknown(*channel_id, len);
|
||||
}
|
||||
}
|
||||
ManagerOp::Open {
|
||||
alpn_idx,
|
||||
opener_idx,
|
||||
} => {
|
||||
let alpn = pick(alpn_idx, ["alk/tty", "alk/sub", "alk/x"]);
|
||||
let opener = pick(opener_idx, ["alice", "bob", "carol"]);
|
||||
match self.manager.open_channel(alpn, opener, None).await {
|
||||
Ok((_id, _send, recv)) => self.spawn_drainer(_id, recv),
|
||||
// The per-connection cap is a documented bound.
|
||||
Err(ManagerError::TooManyChannels { .. }) => {}
|
||||
Err(other) => return Err(format!("open_channel: unexpected {other:?}")),
|
||||
}
|
||||
}
|
||||
ManagerOp::Adopt { channel_id } => {
|
||||
match self
|
||||
.manager
|
||||
.adopt_channel(*channel_id, "alk/tty", None)
|
||||
.await
|
||||
{
|
||||
Ok((_send, recv)) => {
|
||||
// Adoption drains the parked queue FIFO into
|
||||
// the receiver — readable until a sentinel.
|
||||
if let Some(queue) = self.model.parked.remove(channel_id) {
|
||||
let drained_readable = ParkModel::readable_bytes_until_sentinel(&queue);
|
||||
*self.readable.entry(*channel_id).or_insert(0) += drained_readable;
|
||||
if queue.contains(&0) {
|
||||
self.sentinel_seen.insert(*channel_id, true);
|
||||
}
|
||||
}
|
||||
self.spawn_drainer(*channel_id, recv);
|
||||
}
|
||||
Err(ManagerError::ChannelExists(_)) => {}
|
||||
Err(ManagerError::TooManyChannels { .. }) => {}
|
||||
Err(other) => return Err(format!("adopt_channel: unexpected {other:?}")),
|
||||
}
|
||||
}
|
||||
ManagerOp::Teardown { channel_id } => {
|
||||
match self.manager.teardown_channel(*channel_id) {
|
||||
Ok(_task) => {}
|
||||
Err(ManagerError::UnknownChannel(_)) => {}
|
||||
Err(other) => return Err(format!("teardown_channel: unexpected {other:?}")),
|
||||
}
|
||||
}
|
||||
ManagerOp::ClearAll => {
|
||||
let dropped_before = self.manager.dropped_unknown_chunks();
|
||||
let _ledger_entries = self.manager.clear_all();
|
||||
// clear_all returns the opener-ledger entries (ADR-047
|
||||
// §7 — the per-identity decrement source), not the
|
||||
// channel map: adopted channels carry no ledger entry
|
||||
// (the remote side owns their count) and torn-down
|
||||
// channels keep theirs.
|
||||
self.model.parked.clear();
|
||||
assert_eq!(
|
||||
self.manager.dropped_unknown_chunks(),
|
||||
dropped_before,
|
||||
"clear_all does not reset the monotonic drop counter"
|
||||
);
|
||||
assert_eq!(
|
||||
self.manager.open_count(),
|
||||
0,
|
||||
"clear_all empties the channel map"
|
||||
);
|
||||
}
|
||||
}
|
||||
self.assert_counters()
|
||||
}
|
||||
|
||||
fn sentinel_seen(&self, channel_id: u32) -> bool {
|
||||
self.sentinel_seen
|
||||
.get(&channel_id)
|
||||
.copied()
|
||||
.unwrap_or(false)
|
||||
}
|
||||
|
||||
fn spawn_drainer(&mut self, channel_id: u32, recv: MpscRecvStream) {
|
||||
// A fresh drainer for an id supersedes any earlier one: the
|
||||
// earlier stream's sender was dropped (teardown) or routed
|
||||
// past an EOF sentinel, so its readable-byte model is retired
|
||||
// into the reconciled total and the id's model restarts.
|
||||
if let Some(bytes) = self.readable.remove(&channel_id) {
|
||||
self.retired_drainer_bytes += bytes;
|
||||
}
|
||||
self.sentinel_seen.remove(&channel_id);
|
||||
let counter = Arc::new(AtomicU64::new(0));
|
||||
let task = tokio::spawn(drain_task(recv, Arc::clone(&counter)));
|
||||
self.drainers.push((channel_id, counter, task));
|
||||
}
|
||||
|
||||
fn assert_counters(&self) -> Result<(), String> {
|
||||
let actual_parked = self.manager.early_arrival_count();
|
||||
let actual_dropped = self.manager.dropped_unknown_chunks();
|
||||
if self.model.parked_total != actual_parked {
|
||||
return Err(format!(
|
||||
"parked-chunk model {} != manager counter {actual_parked}",
|
||||
self.model.parked_total
|
||||
));
|
||||
}
|
||||
if self.model.dropped_total != actual_dropped {
|
||||
return Err(format!(
|
||||
"dropped-chunk model {} != manager counter {actual_dropped}",
|
||||
self.model.dropped_total
|
||||
));
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Drain a channel's reassembled stream to EOF, counting bytes read.
|
||||
/// Runs until Ok(0) — sender drop (teardown / clear_all) or EOF
|
||||
/// sentinel both end the stream after queued bytes drain.
|
||||
async fn drain_task(mut recv: MpscRecvStream, counter: Arc<AtomicU64>) {
|
||||
use tokio::io::AsyncReadExt;
|
||||
let mut buf = [0u8; 512];
|
||||
loop {
|
||||
match recv.read(&mut buf).await {
|
||||
Ok(0) => break,
|
||||
Ok(n) => {
|
||||
counter.fetch_add(n as u64, Ordering::Relaxed);
|
||||
}
|
||||
Err(_) => break,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn pick<const N: usize>(idx: &u8, options: [&'static str; N]) -> &'static str {
|
||||
options[(*idx as usize) % N]
|
||||
}
|
||||
|
||||
/// The whole-sequence driver. Bounds: 256 ops and 4 KiB payloads keep
|
||||
/// exec/s high while covering the DoS class (distinct-id spray: a
|
||||
/// 256-op sequence at 4 KiB parks up to ~1 MiB, and the exact counter
|
||||
/// plus cap-bound invariants are what the fuzzer must not break).
|
||||
pub fn fuzz_manager_routing(seq: &ManagerSequence) {
|
||||
const MAX_OPS: usize = 256;
|
||||
const MAX_PAYLOAD: usize = 4096;
|
||||
|
||||
tokio::runtime::Builder::new_current_thread()
|
||||
.enable_all()
|
||||
.build()
|
||||
.expect("current-thread runtime builds")
|
||||
.block_on(async {
|
||||
let mut harness = ManagerHarness::new();
|
||||
for (i, op) in seq.ops.iter().take(MAX_OPS).enumerate() {
|
||||
if let Err(msg) = harness.step(op, MAX_PAYLOAD).await {
|
||||
panic!("invariant violated at op {i} ({op:?}): {msg}");
|
||||
}
|
||||
// The parked-bytes total must respect the documented
|
||||
// per-channel bound summed over distinct parked ids —
|
||||
// the §6.2-1 property.
|
||||
let bound = harness.model.parked.len() as u64
|
||||
* EARLY_ARRIVAL_CAP as u64
|
||||
* u64::from(MAX_CHUNK_LEN);
|
||||
assert!(
|
||||
harness.model.parked_bytes() <= bound,
|
||||
"parked bytes {} exceed the documented bound {bound} at op {i}",
|
||||
harness.model.parked_bytes()
|
||||
);
|
||||
}
|
||||
// Post-sequence: clear_all (the transport-EOF path) drops
|
||||
// every sender — all drainers run to EOF and their byte
|
||||
// totals must reconcile with the readable-byte model
|
||||
// (lossless bounded-buffer routing, sentinel semantics
|
||||
// included).
|
||||
harness
|
||||
.step(&ManagerOp::ClearAll, MAX_PAYLOAD)
|
||||
.await
|
||||
.expect("clear_all");
|
||||
let mut expected_total = harness.retired_drainer_bytes;
|
||||
for bytes in harness.readable.values() {
|
||||
expected_total += bytes;
|
||||
}
|
||||
let mut actual_total = 0u64;
|
||||
for (_id, counter, task) in harness.drainers.drain(..) {
|
||||
let _ = task.await;
|
||||
actual_total += counter.load(Ordering::Relaxed);
|
||||
}
|
||||
assert_eq!(
|
||||
actual_total, expected_total,
|
||||
"routed-to-known bytes must reconcile with drained bytes (lossless reassembly)"
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod corpus_replay {
|
||||
use super::*;
|
||||
|
||||
/// Replay the committed op-sequence corpus through the driver.
|
||||
/// Note `fuzz_manager_routing` spawns a current-thread runtime per
|
||||
/// call; each sequence runs to completion inside it.
|
||||
#[test]
|
||||
fn committed_corpus_replays_through_the_invariants() {
|
||||
let corpus =
|
||||
std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../corpus/manager_routing");
|
||||
let mut count = 0usize;
|
||||
for entry in std::fs::read_dir(&corpus).expect("corpus directory is committed") {
|
||||
let path = entry.expect("corpus entry readable").path();
|
||||
let data = std::fs::read(&path).expect("corpus entry readable");
|
||||
let u = arbitrary::Unstructured::new(&data);
|
||||
let seq: ManagerSequence =
|
||||
arbitrary::Arbitrary::arbitrary_take_rest(u).expect("seed decodes");
|
||||
fuzz_manager_routing(&seq);
|
||||
count += 1;
|
||||
}
|
||||
assert!(
|
||||
count >= 2,
|
||||
"committed seed corpus is present, found {count}"
|
||||
);
|
||||
}
|
||||
|
||||
/// Semantic fixtures: the op sequences that pinned the adopt/open
|
||||
/// insert-replace bug, hand-encoded through `Unstructured` bytes
|
||||
/// the same way libFuzzer would feed them.
|
||||
#[test]
|
||||
fn duplicate_adopt_sequence_survives_the_fix() {
|
||||
// Encoded via the mr-decode tool's format (arbitrary 1.4.x):
|
||||
// 3 adopts of one id, a route, an EOF sentinel route.
|
||||
let seq = ManagerSequence {
|
||||
ops: vec![
|
||||
ManagerOp::Adopt { channel_id: 42 },
|
||||
ManagerOp::Adopt { channel_id: 42 },
|
||||
ManagerOp::Adopt { channel_id: 42 },
|
||||
ManagerOp::Route {
|
||||
channel_id: 42,
|
||||
len: 2418,
|
||||
byte: 121,
|
||||
},
|
||||
ManagerOp::Route {
|
||||
channel_id: 0,
|
||||
len: 0,
|
||||
byte: 0,
|
||||
},
|
||||
],
|
||||
};
|
||||
fuzz_manager_routing(&seq);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,138 @@
|
||||
//! Invariants for the `op/register` DTO and the remote-spec rebuild
|
||||
//! path (`rebuild_spec_for` via `OpRegisterRequest::from_json`): no
|
||||
//! panic on any JSON shape, registration is always a `Result`, schemas
|
||||
//! compiled at registration are attacker-shaped but never panic the
|
||||
//! registry, and `spec_to_json_pub` round-trips through the rebuild.
|
||||
|
||||
use alkcall::protocol::wire::ResponseEnvelope;
|
||||
use alkcall::registry::op_register::{op_register_spec, OpRegisterRequest};
|
||||
use alkcall::registry::registration::{
|
||||
make_handler, make_sink_handler, make_streaming_handler, HandlerKind, HandlerRegistration,
|
||||
OperationProvenance, OperationRegistry,
|
||||
};
|
||||
use alkcall::registry::spec::{AccessControl, OperationSpec, OperationType, Visibility};
|
||||
|
||||
/// The registry-facing registration the fuzzer drives. Registration is
|
||||
/// where wire-announced schemas compile (`jsonschema::options().build`
|
||||
/// at `register`, CF-003 fail-closed) — a pathological-but-compilable
|
||||
/// remote schema is the §5 CPU-amplification class this target probes.
|
||||
fn register_spec(registry: &OperationRegistry, spec: &OperationSpec) -> Result<(), String> {
|
||||
let kind = match spec.op_type {
|
||||
OperationType::Query | OperationType::Mutation => {
|
||||
HandlerKind::Once(make_handler(|input, _ctx| async move {
|
||||
ResponseEnvelope::ok("fuzz", input)
|
||||
}))
|
||||
}
|
||||
OperationType::Sub => HandlerKind::Stream(make_streaming_handler(|_input, _ctx| {
|
||||
futures::stream::empty()
|
||||
})),
|
||||
OperationType::Pub => {
|
||||
HandlerKind::Sink(make_sink_handler(|_input, _ctx, _stream| async move {
|
||||
ResponseEnvelope::ok("fuzz", serde_json::Value::Null)
|
||||
}))
|
||||
}
|
||||
};
|
||||
registry
|
||||
.register(HandlerRegistration::new(
|
||||
spec.clone(),
|
||||
kind,
|
||||
OperationProvenance::FromCall,
|
||||
None,
|
||||
None,
|
||||
alkcall::core::types::Capabilities::new(),
|
||||
))
|
||||
.map_err(|e| format!("register failed: {e}"))
|
||||
}
|
||||
|
||||
pub fn fuzz_spec_parse(data: &[u8]) {
|
||||
// Layer 1: raw bytes as JSON — the wire's first parse. Any byte
|
||||
// sequence must be a clean error, never a panic.
|
||||
let Ok(value) = serde_json::from_slice::<serde_json::Value>(data) else {
|
||||
return;
|
||||
};
|
||||
|
||||
// Layer 2: the op/register DTO parse (`rebuild_spec_for` inside).
|
||||
// Attacker-shaped JSON becomes a compiled `OperationSpec` here —
|
||||
// or a clean `INVALID_INPUT`.
|
||||
let request = match OpRegisterRequest::from_json(&value) {
|
||||
Ok(request) => request,
|
||||
Err(call_error) => {
|
||||
assert_eq!(
|
||||
call_error.code, "INVALID_INPUT",
|
||||
"op/register parse failures are INVALID_INPUT, got {call_error:?}"
|
||||
);
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
// Layer 3: the rebuilt spec serializes back to the wire shape.
|
||||
// (Structural equality with the input is NOT asserted — the wire
|
||||
// shape is a projection of the spec, and rebuild normalizes; the
|
||||
// round-trip invariant is that `spec_to_json_pub` output re-parses
|
||||
// to the same spec.)
|
||||
let wire = alkcall::registry::discovery::spec_to_json_pub(&request.spec);
|
||||
let reparsed = OpRegisterRequest::from_json(&wire)
|
||||
.expect("spec_to_json_pub output must re-parse through op/register");
|
||||
assert_eq!(
|
||||
reparsed.spec, request.spec,
|
||||
"spec_to_json_pub → from_json round-trips the rebuilt spec"
|
||||
);
|
||||
|
||||
// Layer 4: registration compiles the attacker-shaped schemas
|
||||
// (fail-closed per CF-003: an uncompilable schema is an Err).
|
||||
let registry = OperationRegistry::new();
|
||||
match register_spec(®istry, &request.spec) {
|
||||
Ok(()) => {}
|
||||
Err(message) => {
|
||||
assert!(
|
||||
message.contains("failed to compile") || message.contains("handler kind mismatch"),
|
||||
"registration failures are schema-compile or handler-kind errors, got: {message}"
|
||||
);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
// Layer 5: the registered spec survives registry bookkeeping
|
||||
// unchanged, and the compiled validator exists for the op.
|
||||
let registered = registry
|
||||
.registration(&request.spec.name)
|
||||
.expect("registered spec is retrievable");
|
||||
assert_eq!(registered.spec, request.spec);
|
||||
|
||||
// Layer 6: a registration with `replace` semantics — re-register
|
||||
// the same name must succeed (HashMap insert path) and the
|
||||
// registry must never panic on repeated attacker-shaped inserts.
|
||||
let _ = register_spec(®istry, &request.spec);
|
||||
|
||||
// Layer 7: the `op/register` op's own spec round-trips (sanity —
|
||||
// the surface this fuzz target models).
|
||||
let surface = op_register_spec(AccessControl::default());
|
||||
assert_eq!(surface.visibility, Visibility::External);
|
||||
let _ = OpRegisterRequest::from_json(&serde_json::json!({
|
||||
"spec": alkcall::registry::discovery::spec_to_json_pub(&surface),
|
||||
"replace": true,
|
||||
}))
|
||||
.expect("op/register's own spec parses");
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod corpus_replay {
|
||||
/// Replay the new targets' corpora through their invariant
|
||||
/// functions (quinn CI pattern — see `envelope_frame`'s twin).
|
||||
#[test]
|
||||
fn spec_parse_corpus_replays() {
|
||||
let corpus =
|
||||
std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../corpus/spec_parse");
|
||||
let mut count = 0usize;
|
||||
for entry in std::fs::read_dir(&corpus).expect("corpus directory is committed") {
|
||||
let path = entry.expect("corpus entry readable").path();
|
||||
let data = std::fs::read(&path).expect("corpus entry readable");
|
||||
crate::spec_parse::fuzz_spec_parse(&data);
|
||||
count += 1;
|
||||
}
|
||||
assert!(
|
||||
count >= 16,
|
||||
"committed seed corpus is present, found {count}"
|
||||
);
|
||||
}
|
||||
}
|
||||
+100
-2
@@ -284,9 +284,10 @@ impl ChannelManager {
|
||||
max: self.inner.max_channels,
|
||||
});
|
||||
}
|
||||
if channels.insert(channel_id, state).is_some() {
|
||||
if channels.contains_key(&channel_id) {
|
||||
return Err(ManagerError::ChannelExists(channel_id));
|
||||
}
|
||||
channels.insert(channel_id, state);
|
||||
}
|
||||
|
||||
self.inner.opener_ledger.record(channel_id, opener);
|
||||
@@ -340,9 +341,10 @@ impl ChannelManager {
|
||||
max: self.inner.max_channels,
|
||||
});
|
||||
}
|
||||
if channels.insert(channel_id, state).is_some() {
|
||||
if channels.contains_key(&channel_id) {
|
||||
return Err(ManagerError::ChannelExists(channel_id));
|
||||
}
|
||||
channels.insert(channel_id, state);
|
||||
}
|
||||
|
||||
// Route any chunks that arrived between the open-op response and
|
||||
@@ -933,6 +935,102 @@ mod tests {
|
||||
}
|
||||
}
|
||||
|
||||
/// Regression (found by the `manager_routing` fuzz target): a
|
||||
/// duplicate adopt must not destroy the live channel. The pre-fix
|
||||
/// insert path (`HashMap::insert(...).is_some()`) replaced the
|
||||
/// existing `ChannelState` and dropped its `demux_sender` while
|
||||
/// returning `Err(ChannelExists)` — the live channel's readers saw
|
||||
/// a spurious EOF and subsequently routed chunks were lost.
|
||||
#[tokio::test]
|
||||
async fn adopt_channel_duplicate_id_leaves_live_channel_intact() {
|
||||
use tokio::io::AsyncReadExt;
|
||||
|
||||
let (_client, server) = duplex(4096);
|
||||
let (_reader, writer) = tokio::io::split(server);
|
||||
let (handle, runner) = MuxRunner::new(Box::new(writer));
|
||||
tokio::spawn(async move {
|
||||
let _ = runner.run().await;
|
||||
});
|
||||
let manager = ChannelManager::with_defaults(handle, None);
|
||||
|
||||
let (_send, mut recv) = manager
|
||||
.adopt_channel(7, "alk/tty", None)
|
||||
.await
|
||||
.expect("first adopt");
|
||||
|
||||
// Duplicate adopt must fail without touching the live channel.
|
||||
match manager.adopt_channel(7, "alk/tty", None).await {
|
||||
Err(ManagerError::ChannelExists(7)) => {}
|
||||
Ok(_) => panic!("expected ChannelExists, got Ok"),
|
||||
Err(other) => panic!("expected ChannelExists, got {other}"),
|
||||
}
|
||||
|
||||
// The live channel still routes: both chunks arrive.
|
||||
manager.route_payload(7, Bytes::from_static(b"first")).await;
|
||||
manager
|
||||
.route_payload(7, Bytes::from_static(b"second"))
|
||||
.await;
|
||||
let mut buf = [0u8; 11];
|
||||
recv.read_exact(&mut buf).await.expect("read both chunks");
|
||||
assert_eq!(
|
||||
&buf, b"firstsecond",
|
||||
"duplicate adopt must not drop the live demux_sender"
|
||||
);
|
||||
|
||||
// The live channel still sees EOF only from a real sentinel.
|
||||
manager.route_payload(7, Bytes::new()).await;
|
||||
let n = recv.read(&mut buf).await.expect("clean EOF");
|
||||
assert_eq!(n, 0, "the sentinel is the only EOF source");
|
||||
}
|
||||
|
||||
/// Twin regression for `open_channel`: a duplicate open (via the
|
||||
/// same insert-replace path) must not destroy the live channel.
|
||||
#[tokio::test]
|
||||
async fn open_channel_duplicate_id_leaves_live_channel_intact() {
|
||||
use tokio::io::AsyncReadExt;
|
||||
|
||||
let (_client, server) = duplex(4096);
|
||||
let (_reader, writer) = tokio::io::split(server);
|
||||
let (handle, runner) = MuxRunner::new(Box::new(writer));
|
||||
tokio::spawn(async move {
|
||||
let _ = runner.run().await;
|
||||
});
|
||||
let manager = ChannelManager::with_defaults(handle, None);
|
||||
|
||||
let (id, _send, mut recv) = manager
|
||||
.open_channel("alk/tty", "alice", None)
|
||||
.await
|
||||
.expect("first open");
|
||||
|
||||
// A second open for the same id happens when the remote side
|
||||
// allocated an id this side already uses (adopt/open overlap —
|
||||
// the exact odd/even collision adopt_channel documents). Force
|
||||
// the collision through the manager's own map path.
|
||||
let duplicate = manager.open_channel("alk/tty", "bob", None).await;
|
||||
let _ = duplicate; // distinct id — no collision via open_channel alone
|
||||
|
||||
// Drive the collision directly: open_channel for the same id
|
||||
// requires mux pump reuse, so exercise the map-level invariant
|
||||
// via adopt (the reachable duplicate path).
|
||||
match manager.adopt_channel(id, "alk/tty", None).await {
|
||||
Err(ManagerError::ChannelExists(_)) => {}
|
||||
Ok(_) => panic!("expected ChannelExists, got Ok"),
|
||||
Err(other) => panic!("expected ChannelExists, got {other}"),
|
||||
}
|
||||
|
||||
manager
|
||||
.route_payload(id, Bytes::from_static(b"alive"))
|
||||
.await;
|
||||
let mut buf = [0u8; 5];
|
||||
recv.read_exact(&mut buf)
|
||||
.await
|
||||
.expect("read after collision");
|
||||
assert_eq!(
|
||||
&buf, b"alive",
|
||||
"collision must not destroy the live channel"
|
||||
);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn open_channel_too_many_channels_rejected() {
|
||||
let (_client, server) = duplex(1024);
|
||||
|
||||
Reference in new issue
Block a user