diff --git a/.github/dependabot.yml b/.github/dependabot.yml index f1e8e4a..be10b2e 100644 --- a/.github/dependabot.yml +++ b/.github/dependabot.yml @@ -15,6 +15,26 @@ updates: reviewers: - forkwright + # WHY a second cargo entry: `fuzz/` declares its own empty [workspace] table so + # a nightly sanitizer build stays out of the stable workspace. That detachment + # also puts it outside every repo-wide check keyed to the root manifest -- + # `cargo audit`, `cargo deny`, and the `directory: /` entry above all resolve + # the root graph and never see this crate's dependencies. Without this entry + # the fuzz harness's deps receive no security updates at all. + - package-ecosystem: cargo + directory: /fuzz + schedule: + interval: weekly + day: monday + open-pull-requests-limit: 5 + groups: + patch-updates: + update-types: [patch] + minor-updates: + update-types: [minor] + reviewers: + - forkwright + - package-ecosystem: github-actions directory: / schedule: diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml index 84b44df..46181a8 100644 --- a/.github/workflows/security.yml +++ b/.github/workflows/security.yml @@ -61,6 +61,20 @@ jobs: command: check advisories licenses bans sources arguments: --all-features + # WHY a second invocation rather than a wider first one: `fuzz/` declares + # its own [workspace], so the root run resolves a graph that does not + # contain it. cargo-deny follows the manifest it is given and there is no + # flag that makes one run span two workspaces. + - uses: EmbarkStudios/cargo-deny-action@3c6349835b2b7b196a839186cb8b78e02f7b5f25 # v2.1.1 + with: + command: check advisories licenses bans sources + arguments: --all-features + # WHY the action's own input rather than a flag in `arguments`: the + # action always passes `--manifest-path` from this input (defaulting + # to ./Cargo.toml), so putting one in `arguments` supplies the flag + # twice and cargo-deny rejects it outright. + manifest-path: fuzz/Cargo.toml + cargo-audit: # WHY: cargo-deny's advisories check overlaps but uses a different code # path; running cargo-audit independently protects against bugs or @@ -84,6 +98,11 @@ jobs: # .cargo/audit.toml, which mirrors deny.toml's [[advisories.ignore]] # entries — no silent --ignore flags here. run: cargo audit --deny unmaintained --deny unsound --deny yanked + - name: cargo audit (fuzz workspace) + # WHY separate: cargo-audit reads one lockfile, and `fuzz/` has its own + # because it is a detached workspace. Without this its dependency tree + # is scanned by nothing. + run: cargo audit --file fuzz/Cargo.lock --deny unmaintained --deny unsound --deny yanked osv-scanner: name: osv-scanner @@ -106,4 +125,9 @@ jobs: echo "ERROR: downloaded binary version mismatch" >&2; exit 1; } echo "/tmp" >> "$GITHUB_PATH" - name: osv scanner - run: osv-scanner scan source --config=osv-scanner.toml --lockfile=Cargo.lock + # WHY both lockfiles named explicitly: `fuzz/` is a detached workspace + # with its own lockfile, and a single `--lockfile` covers only the graph + # it names. + run: | + osv-scanner scan source --config=osv-scanner.toml \ + --lockfile=Cargo.lock --lockfile=fuzz/Cargo.lock diff --git a/deny.toml b/deny.toml index 59be15f..01c652a 100644 --- a/deny.toml +++ b/deny.toml @@ -34,6 +34,20 @@ allow = [ ] confidence-threshold = 0.8 +# WHY an exception rather than adding NCSA to `allow` above: libfuzzer-sys is +# `(MIT OR Apache-2.0) AND NCSA` because it wraps LLVM's libFuzzer, which +# predates LLVM's relicensing. NCSA is permissive, OSI-approved, FSF +# Free/Libre and compatible with this workspace's AGPL-3.0 — but it is +# compatible for THIS dependency, and a global allow would silently accept it +# from any future crate in the runtime graph as well. 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-[package.metadata] -cargo-fuzz = true - -[dependencies] -bytes = "1" -libfuzzer-sys = "0.4" -prost = "0.14.3" -tokio-util = { version = "0.7.18", features = ["codec"] } - -[dependencies.kerykeion] -path = "../crates/kerykeion" - [[bin]] name = "frame_decode" path = "fuzz_targets/frame_decode.rs" @@ -45,4 +35,12 @@ test = false doc = false bench = false -[workspace] +[dependencies] +bytes = "1" +kerykeion = { path = "../crates/kerykeion" } +libfuzzer-sys = "0.4" +prost = "0.14.3" +tokio-util = { version = "0.7.18", features = ["codec"] } + +[package.metadata] +cargo-fuzz = true diff --git a/fuzz/LICENSE b/fuzz/LICENSE new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/fuzz/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/fuzz/README.md b/fuzz/README.md index 2000874..27ca06f 100644 --- a/fuzz/README.md +++ b/fuzz/README.md @@ -5,7 +5,7 @@ start from. Written for [`cargo-fuzz`](https://github.com/rust-fuzz/cargo-fuzz). ## Running them -Nightly only — libFuzzer and its sanitizers are not on stable. The repository toolchain stays stable; +Nightly only. libFuzzer and its sanitizers are not on stable. The repository toolchain stays stable; this crate is deliberately outside the workspace so that stays true. ```sh @@ -15,7 +15,7 @@ cargo +nightly fuzz run frame_decode -- -max_total_time=60 # bounded, as CI ru cargo +nightly fuzz list ``` -If `cargo-fuzz` was installed as a musl binary, pass the host triple explicitly — it takes its +If `cargo-fuzz` was installed as a musl binary, pass the host triple explicitly. It takes its default build target from the triple it was built for, not from the machine it runs on, and a sanitizer cannot link against a static libc: @@ -37,27 +37,27 @@ cargo +nightly fuzz run frame_decode fuzz/artifacts/frame_decode/crash- | `message_parse` | `FromRadio` / `ToRadio` | decoding fails cleanly; re-encoding reaches a fixed point | | `routing_decision` | `RoutingProcessor::process_routing` | every decodable packet gets a verdict | -`frame_decode` asserts progress rather than only absence of panic: a decoder that reports a frame +`frame_decode` asserts progress, not just the absence of a panic: a decoder that reports a frame without consuming bytes turns `Framed`'s loop into a hang, which a panic-only check would not see. -`message_parse` asserts that encoding reaches a fixed point — a second pass produces the same bytes as -the first — so a parser accepting more than the type can represent shows up as a field that survives +`message_parse` asserts that encoding reaches a fixed point: a second pass produces the same bytes as +the first, so a parser accepting more than the type can represent shows up as a field that survives one round and not two. -It compares **bytes**, not decoded values, and that distinction was found rather than designed. These +It compares **bytes**, not decoded values, and the fuzzer found that distinction; nobody designed it. These messages carry `f32` fields and `NaN != NaN`, so a value comparison reported a byte-perfect round trip of a NaN `NodeInfo.snr` as a failure. The fuzzer produced it within a minute of the target first running; `corpus/message_parse/nan_snr.bin` is that exact input. ## The corpus -`corpus//` holds hand-built seeds rather than captured traffic, each one a shape named for +`corpus//` holds hand-built seeds, not captured traffic, each one a shape named for what it exercises: valid frames, a frame split across the magic pair, a length field exceeding `MAX_PACKET_SIZE`, a truncated varint, an unknown field number. The bytes are derived from the frame layout documented at the top of `crates/kerykeion/src/codec.rs` and from protobuf wire encoding. -libFuzzer grows this corpus as it finds new coverage. Committing an input it discovers — particularly -one that reproduced a defect — is how a fixed bug stays fixed. +libFuzzer grows this corpus as it finds new coverage. Committing an input it discovers, particularly +one that reproduced a defect, is how a fixed bug stays fixed. ## CI diff --git a/fuzz/fuzz_targets/message_parse.rs b/fuzz/fuzz_targets/message_parse.rs index a810ef3..4b2c48b 100644 --- a/fuzz/fuzz_targets/message_parse.rs +++ b/fuzz/fuzz_targets/message_parse.rs @@ -23,14 +23,19 @@ fuzz_target!(|data: &[u8]| { // `NodeInfo.snr` (`22 05 25 d4 8d ff ff`, kept as a corpus seed), within // a minute of first running. Bytes are the property that was meant. let once = message.encode_to_vec(); - let again = FromRadio::decode(once.as_slice()) - .expect("a message this parser produced must decode again") - .encode_to_vec(); - assert_eq!(once, again, "re-encoding must reach a fixed point"); + let again = FromRadio::decode(once.as_slice()).map(|m| m.encode_to_vec()); + assert_eq!( + again.ok().as_deref(), + Some(once.as_slice()), + "a message this parser produced must decode again, to the same bytes" + ); } // The outbound direction is parsed from untrusted input too, in the gateway // and replay paths. No round-trip assertion here: only the inbound type is - // reconstructed from the wire in normal operation. - let _ = ToRadio::decode(data); + // reconstructed from the wire in normal operation, so the point is that + // decoding neither panics nor hangs. `drop` rather than `let _ =` because + // the discard is the intent, and a silent `let _` on a Result reads as an + // oversight wherever it appears. + drop(ToRadio::decode(data)); });