From 56ff9145c66ccb0023cdb5876b0835016917ae67 Mon Sep 17 00:00:00 2001 From: askalf <263217947+askalf@users.noreply.github.com> Date: Sun, 12 Jul 2026 10:26:13 -0400 Subject: [PATCH 1/2] security: add ClusterFuzzLite continuous fuzzing of the composed gate (Scorecard Fuzzing) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The individual tools are each fuzzed in their own repo; this adds the missing piece — fuzzing the INTEGRATION. Two Jazzer.js targets exercise this repo's own code with arbitrary bytes: - composed_gate: feeds arbitrary actions through guardedCall and asserts the two headline invariants — it NEVER throws into the agent, and it FAILS CLOSED (proceeds only when redstamp itself would allow the action; a proceed on a non-allow verdict is a fail-open bug). Vault/lock/pin are set up once at module load; a reused high-use lease keeps each exec O(1). - egress_host: fuzzes egressHost(), the parser that decides which host a secret may be redeemed toward; asserts it never throws and returns string|null. Wiring mirrors the fleet pattern (redstamp): OSS-Fuzz JS base builder pinned by digest, weekly + on-demand cflite.yml (SHA-pinned actions), and a fuzz-only Jazzer manifest hash-pinned by its committed lockfile. Because this repo (unlike the zero-dep tools) has runtime deps the targets import, build.sh installs the project deps first, then merges Jazzer on top — Jazzer never enters package.json. A .gitattributes pins *.sh to LF so a Windows re-commit can't break build.sh in the Linux OSS-Fuzz container. `npm run fuzz` runs every target locally. Resolves the OpenSSF Scorecard Fuzzing alert. Both targets run clean locally (egress_host ~45k runs, composed_gate ~1.2k runs, no crashes). --- .clusterfuzzlite/Dockerfile | 9 + .clusterfuzzlite/build.sh | 28 + .clusterfuzzlite/package-lock.json | 1236 ++++++++++++++++++++++++++++ .clusterfuzzlite/package.json | 8 + .gitattributes | 4 + .github/workflows/cflite.yml | 44 + fuzz/composed_gate.fuzz.js | 64 ++ fuzz/egress_host.fuzz.js | 23 + fuzz/run.mjs | 28 + package.json | 3 +- 10 files changed, 1446 insertions(+), 1 deletion(-) create mode 100644 .clusterfuzzlite/Dockerfile create mode 100755 .clusterfuzzlite/build.sh create mode 100644 .clusterfuzzlite/package-lock.json create mode 100644 .clusterfuzzlite/package.json create mode 100644 .gitattributes create mode 100644 .github/workflows/cflite.yml create mode 100644 fuzz/composed_gate.fuzz.js create mode 100644 fuzz/egress_host.fuzz.js create mode 100644 fuzz/run.mjs diff --git a/.clusterfuzzlite/Dockerfile b/.clusterfuzzlite/Dockerfile new file mode 100644 index 0000000..1693c28 --- /dev/null +++ b/.clusterfuzzlite/Dockerfile @@ -0,0 +1,9 @@ +# ClusterFuzzLite build image — OpenSSF Scorecard detects fuzzing via this file. +# Uses the OSS-Fuzz JavaScript base builder (Jazzer.js), which provides +# `compile_javascript_fuzzer`. See build.sh for the fuzz targets. +# Base pinned by digest (Scorecard Pinned-Dependencies). OSS-Fuzz rolls this +# image, so bump the digest periodically if the weekly fuzz build breaks. +FROM gcr.io/oss-fuzz-base/base-builder-javascript@sha256:717f88cd72ee85ab295debf1272eed85590621d6ba9d70d6c59133a61f3f3acf +COPY . $SRC/agent-security-stack +WORKDIR $SRC/agent-security-stack +COPY .clusterfuzzlite/build.sh $SRC/build.sh diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh new file mode 100755 index 0000000..80fe827 --- /dev/null +++ b/.clusterfuzzlite/build.sh @@ -0,0 +1,28 @@ +#!/bin/bash -eu +# Build the Jazzer.js fuzz targets for ClusterFuzzLite / OSS-Fuzz. +# +# Unlike the individual tools (redstamp/truecopy/strongroom are zero-dependency), +# this repo is the COMPOSITION layer: the fuzz targets import the composed gate, +# which pulls the three @askalf/* packages (git-hosted, pinned) plus the MCP SDK. +# So the fuzz build installs the project's own runtime deps first, then merges the +# fuzz-only Jazzer.js on top — Jazzer is never added to the project manifest. +# +# The invariants under test (see fuzz/*.fuzz.js): the composed gate sits in the +# agent's hot path and must NEVER throw into the agent on arbitrary input, and +# must FAIL CLOSED — it proceeds only when redstamp itself would allow the action. +cd "$SRC/agent-security-stack" + +# 1. project runtime deps — npm ci verifies every integrity hash in the committed +# root lockfile (the @askalf/* deps are git-pinned there; the MCP SDK is on npm). +npm ci --no-audit --no-fund + +# 2. fuzz-only Jazzer.js, hash-pinned by .clusterfuzzlite/package-lock.json, merged +# into the project's node_modules without touching the project's package.json. +(cd .clusterfuzzlite && npm ci --no-audit --no-fund) +cp -a .clusterfuzzlite/node_modules/. node_modules/ + +# compile_javascript_fuzzer executes node_modules/@jazzer.js/core/dist/cli.js +# relative to the project root, so the merge above puts it where it expects. +for target in composed_gate egress_host; do + compile_javascript_fuzzer 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Jazzer.js is hash-pinned via the committed lockfile (`npm ci` verifies integrity — Scorecard Pinned-Dependencies) and is merged alongside the project's runtime deps only inside the fuzz build; it is never added to the project's own package.json.", + "dependencies": { + "@jazzer.js/core": "4.0.0" + } +} diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..2f4339a --- /dev/null +++ b/.gitattributes @@ -0,0 +1,4 @@ +# The ClusterFuzzLite build script runs in a Linux (OSS-Fuzz) container — a CR +# byte would break its shebang/commands. Pin shell scripts to LF so a Windows +# checkout + re-commit (autocrlf) can't silently CRLF-ify them. +*.sh text eol=lf diff --git a/.github/workflows/cflite.yml b/.github/workflows/cflite.yml new file mode 100644 index 0000000..bcc55b9 --- /dev/null +++ b/.github/workflows/cflite.yml @@ -0,0 +1,44 @@ +# ClusterFuzzLite — continuous fuzzing of the COMPOSED gate. Unlike the individual +# tools (each fuzzed in its own repo), this exercises the integration: that +# guardedCall never throws into the agent on arbitrary tool-call input and always +# FAILS CLOSED (proceeds only when redstamp would allow), plus the egress-host +# binding that decides where a secret may be redeemed. Runs weekly + on demand; a +# discovered crash fails the job and is uploaded as an artifact. Fuzz targets live +# in ./fuzz, built by .clusterfuzzlite/build.sh (Jazzer.js). OpenSSF Scorecard +# credits the Fuzzing check from the .clusterfuzzlite/ config. +name: ClusterFuzzLite + +on: + schedule: + - cron: '23 4 * * 1' # weekly, Monday 04:23 UTC (staggered off the :00 grid) + workflow_dispatch: + +permissions: read-all + +jobs: + Fuzzing: + runs-on: ubuntu-latest + strategy: + fail-fast: false + matrix: + # JavaScript (Jazzer.js) has no native sanitizer — OSS-Fuzz rejects + # address/memory/undefined for JS ("cannot be fuzzed with sanitizers"), + # and the action's config rejects `none`. `coverage` is the value real + # JS ClusterFuzzLite projects use with this action version. + sanitizer: [coverage] + steps: + - name: Build fuzzers (${{ matrix.sanitizer }}) + id: build + uses: google/clusterfuzzlite/actions/build_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1 + with: + language: javascript + sanitizer: ${{ matrix.sanitizer }} + - name: Run fuzzers (${{ matrix.sanitizer }}) + id: run + uses: google/clusterfuzzlite/actions/run_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1 + with: + github-token: ${{ secrets.GITHUB_TOKEN }} + fuzz-seconds: 300 + mode: 'batch' + language: javascript + sanitizer: ${{ matrix.sanitizer }} diff --git a/fuzz/composed_gate.fuzz.js b/fuzz/composed_gate.fuzz.js new file mode 100644 index 0000000..73a4f1d --- /dev/null +++ b/fuzz/composed_gate.fuzz.js @@ -0,0 +1,64 @@ +// Fuzz the composed gate's fail-closed guarantee. guardedCall runs an arbitrary +// tool call through truecopy -> redstamp -> strongroom; the stack's headline +// promise is that it sits in the agent's hot path and (a) NEVER throws into the +// agent on arbitrary input and (b) FAILS CLOSED — it proceeds (ok:true) only when +// redstamp itself would ALLOW the action. A blocked/gray action that reaches +// ok:true would be a fail-OPEN composition bug, which this target hunts for. +// +// The isolated vault + one clean, pinned tool + a reusable lease are built ONCE at +// module load; fuzz() only varies the action, so each exec stays fast (no +// per-iteration grant churn) and the fuzzer covers the orchestration, not setup. +import fs from 'node:fs'; +import os from 'node:os'; +import path from 'node:path'; +import { check } from '@askalf/redstamp'; +import { pin } from '@askalf/truecopy'; +import { addSecret, grant } from '@askalf/strongroom'; +import { guardedCall, AuditLog } from '../audit-trail.mjs'; + +const HOME = fs.mkdtempSync(path.join(os.tmpdir(), 'oys-fuzz-')); +process.env.KEEPER_HOME = HOME; +const lock = path.join(HOME, 'truecopy.lock'); +const policy = { egressAllow: ['api.example.com'] }; + +const cleanManifest = path.join(HOME, 'clean.json'); +fs.writeFileSync(cleanManifest, JSON.stringify({ name: 'fetcher', tools: [{ name: 'http_get', description: 'GET a URL.' }] })); +pin(cleanManifest, { lockPath: lock, name: 'fetcher' }); + +addSecret('API_KEY', 'sk-live-FUZZ'); +// one high-use lease reused across execs — keeps the leases store single-entry +// (O(1) redeem) instead of accumulating a fresh grant every iteration. +const leaseId = grant('API_KEY', { uses: Number.MAX_SAFE_INTEGER, host: 'api.example.com' }).id; + +export function fuzz(data) { + const s = data.toString('utf8'); + // treat the bytes as a JSON action when possible, else as a shell command payload + let action; + try { action = JSON.parse(s); } catch { action = { tool: 'shell', input: { command: s } }; } + if (action === null || typeof action !== 'object' || Array.isArray(action)) { + action = { tool: 'fetch', input: { url: s } }; + } + + let res; + try { + res = guardedCall( + { manifest: cleanManifest, name: 'fetcher', action, leaseId, host: 'api.example.com', lock, policy }, + new AuditLog(), + ); + } catch (e) { + throw new Error(`composed gate THREW on arbitrary action ${JSON.stringify(s).slice(0, 200)}: ${e.stack}`); + } + + if (!res || typeof res.ok !== 'boolean') { + throw new Error(`gate returned a malformed result: ${JSON.stringify(res)}`); + } + + // fail-closed: a proceed is legitimate only if redstamp's own verdict is ALLOW. + // (deterministic + non-throwing — guardedCall already ran the same check to reach ok:true.) + if (res.ok) { + const v = check(action, policy); + if (v.decision !== 'allow') { + throw new Error(`gate PROCEEDED (fail-open) on a ${v.decision}/${v.tier} action: ${JSON.stringify(action).slice(0, 200)}`); + } + } +} diff --git a/fuzz/egress_host.fuzz.js b/fuzz/egress_host.fuzz.js new file mode 100644 index 0000000..0056a8b --- /dev/null +++ b/fuzz/egress_host.fuzz.js @@ -0,0 +1,23 @@ +// Fuzz the egress-host binding. egressHost() derives, from arbitrary tool-call +// input (action.input.url), the single destination a strongroom secret may be +// redeemed toward — so a throw here would crash the composed gate on a malformed +// URL, and a non-string return would corrupt the host comparison that keeps a +// secret from egressing to an unintended host. Invariant: on arbitrary bytes it +// never throws and always returns a string hostname or null. +import { egressHost } from '../audit-trail.mjs'; + +export function fuzz(data) { + const s = data.toString('utf8'); + // exercise every shape the field can take: well-formed action, url-only, junk + for (const action of [ + { tool: 'fetch', input: { url: s } }, + { input: { url: s } }, + { tool: s }, + { tool: 'fetch', input: { url: s, method: s } }, + ]) { + const h = egressHost(action); + if (h !== null && typeof h !== 'string') { + throw new Error(`egressHost returned non-string/non-null for ${JSON.stringify(s)}: ${JSON.stringify(h)}`); + } + } +} diff --git a/fuzz/run.mjs b/fuzz/run.mjs new file mode 100644 index 0000000..23e4765 --- /dev/null +++ b/fuzz/run.mjs @@ -0,0 +1,28 @@ +// `npm run fuzz` — run every Jazzer.js target in ./fuzz for a short burst. +// Continuous fuzzing runs in CI via ClusterFuzzLite (.github/workflows/ +// cflite.yml); this is the fast local repro loop. Override the per-target budget +// with FUZZ_SECONDS (default 30). +// +// Jazzer is a fuzz-only dependency (hash-pinned under .clusterfuzzlite/ for CI); +// locally it is fetched on demand with `npx`, so nothing is added to the project +// manifest. +import { spawnSync } from 'node:child_process'; +import { readdirSync } from 'node:fs'; +import { fileURLToPath } from 'node:url'; +import path from 'node:path'; + +const dir = path.dirname(fileURLToPath(import.meta.url)); +const targets = readdirSync(dir).filter((f) => f.endsWith('.fuzz.js')).sort(); +const secs = process.env.FUZZ_SECONDS || '30'; +const npx = process.platform === 'win32' ? 'npx.cmd' : 'npx'; + +for (const t of targets) { + const target = `fuzz/${t.replace(/\.js$/, '')}`; + console.log(`\n=== fuzzing ${t} (${secs}s) ===`); + const r = spawnSync( + npx, + ['--yes', '--package', '@jazzer.js/core@^4', 'jazzer', target, '--sync', '--', `-max_total_time=${secs}`], + { stdio: 'inherit' }, + ); + if (r.status !== 0) process.exit(r.status || 1); +} diff --git a/package.json b/package.json index a4baba8..6153957 100644 --- a/package.json +++ b/package.json @@ -12,7 +12,8 @@ "demo:mcp": "node demo/mcp-demo.mjs", "demo:audit": "node demo/audit-demo.mjs", "mcp": "node bin/oys-mcp.mjs", - "test": "node --test" + "test": "node --test", + "fuzz": "node fuzz/run.mjs" }, "dependencies": { "@askalf/redstamp": "git+https://github.com/askalf/redstamp.git#4022dcd48dc867ef82a8a4c2a6f32f7599b3f701", From a0f6706afcf933593c88f0ef7265967e9fd72876 Mon Sep 17 00:00:00 2001 From: askalf <263217947+askalf@users.noreply.github.com> Date: Sun, 12 Jul 2026 10:29:57 -0400 Subject: [PATCH 2/2] fix(fuzz): clone @askalf/* over https in the OSS-Fuzz container MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The root lockfile resolves the git deps to git+ssh://git@github.com URLs. GitHub-hosted CI runners can clone those, but the ClusterFuzzLite build runs inside the OSS-Fuzz base-builder container, which has no SSH key — npm ci would fail to fetch redstamp/truecopy/strongroom. Rewrite ssh -> anonymous https in build.sh's git config (these repos are public); the shared lockfile is untouched. Verified: with GIT_SSH_COMMAND=false (the container's no-key condition), a git ls-remote of an ssh:// URL succeeds through the rewrite and fails without it. --- .clusterfuzzlite/build.sh | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh index 80fe827..72084d0 100755 --- a/.clusterfuzzlite/build.sh +++ b/.clusterfuzzlite/build.sh @@ -12,6 +12,13 @@ # must FAIL CLOSED — it proceeds only when redstamp itself would allow the action. cd "$SRC/agent-security-stack" +# The root lockfile resolves the @askalf/* deps to git+ssh://git@github.com URLs. +# GitHub-hosted CI runners can clone those, but this OSS-Fuzz build container has +# no SSH key — so rewrite ssh -> anonymous https (these repos are public) at clone +# time, without touching the shared lockfile. +git config --global --add url."https://github.com/".insteadOf "ssh://git@github.com/" +git config --global --add url."https://github.com/".insteadOf "git@github.com:" + # 1. project runtime deps — npm ci verifies every integrity hash in the committed # root lockfile (the @askalf/* deps are git-pinned there; the MCP SDK is on npm). npm ci --no-audit --no-fund