commit bd138a8d12a436239c8005f59046b8683a676f6a Author: rootiest Date: Fri Jun 19 22:48:45 2026 -0400 feat: claude-code tokenization proxy with ggshield DLP Local DLP proxy between claude-code and the Anthropic API. Scans outgoing /v1/messages bodies with ggshield, swaps detected secrets for opaque placeholder tokens, and restores them in the streamed SSE response on the fly. Licensed under AGPL-3.0-or-later. diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..24e8c42 --- /dev/null +++ b/.gitignore @@ -0,0 +1,20 @@ + +# ──────────────── Added by agents-init ────────────────── +# agents-init --agents +AGENTS/ +/AGENTS.md +/CLAUDE.md +# ──────────────────────────────────────────────────────── + +# ──────────────── Added by agents-init ────────────────── +# agents-init --plugins +docs/superpowers +docs/plans +docs/specs +docs/devlogs +# ──────────────────────────────────────────────────────── + +node_modules/ + +# ggshield local cache +.cache_ggshield diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/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 General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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/README.md b/README.md new file mode 100644 index 0000000..40690fe --- /dev/null +++ b/README.md @@ -0,0 +1,110 @@ +# claude-tokenization-proxy + +A local Data Loss Prevention (DLP) proxy that sits between `claude-code` and the +Anthropic API. It scans outgoing requests for secrets with +[GitGuardian's `ggshield`](https://github.com/GitGuardian/ggshield), swaps each +secret for an opaque placeholder token before it leaves your machine, then +restores the real secret in the streamed response on the fly — so Claude never +sees your secrets but tooling that echoes a placeholder still gets the real +value back. + +``` +claude-code ──POST /v1/messages──► proxy ──redacted──► api.anthropic.com + │ (ggshield scan, secret → <<>>) +claude-code ◄──SSE (detokenized)─── proxy ◄──SSE stream──┘ + (<<>> → real secret, streaming) +``` + +## How it works + +1. **Request interception** — the JSON body of `POST /v1/messages` is scanned by + `ggshield`. Every detected secret is replaced with a unique + `<<>>` placeholder, and the `token → secret` mapping is kept + in memory (`src/store.ts`). The redacted body is forwarded upstream. +2. **Streaming detokenization** — the Anthropic SSE response is piped through a + stateful `Transform` (`src/detokenize.ts`) that scans the byte stream for + placeholders and substitutes the original secret back. It holds back only the + few characters that could still become a token, so a placeholder split across + chunk boundaries (`…<<>>…`) is reassembled correctly. + +Secrets live only in memory for the lifetime of the process — restart the proxy +and the mapping is gone. + +## Requirements + +- **Node.js ≥ 23.6** (the proxy runs TypeScript directly via Node's built-in + type stripping — no build step, no `ts-node`/`tsx`). On Node 22.6–23.5 run + with `node --experimental-strip-types src/index.ts`. +- **`ggshield`** on your `PATH` and authenticated (`ggshield auth login`). If + `ggshield` is missing or errors, the proxy logs a warning and forwards traffic + **unredacted** (fail-open) — it never blocks your requests. + +## Setup + +```bash +npm install # dev-only deps (TypeScript types); not needed to run +npm start # starts the proxy on http://127.0.0.1:8080 +``` + +Point `claude-code` at the proxy: + +```bash +export ANTHROPIC_BASE_URL=http://127.0.0.1:8080 +claude +``` + +For the [fish shell](https://fishshell.com/): + +```fish +set -gx ANTHROPIC_BASE_URL http://localhost:8080 +claude +``` + +That's the only change `claude-code` needs — it keeps using your normal +`ANTHROPIC_API_KEY` / `x-api-key`, which the proxy forwards untouched. + +## Configuration + +| Env var | Default | Purpose | +| ----------------------- | ------------------ | -------------------------------- | +| `PORT` | `8080` | Port the proxy listens on | +| `ANTHROPIC_UPSTREAM_HOST` | `api.anthropic.com` | Upstream API host to forward to | + +## Tell Claude to leave the tokens alone + +So the model preserves placeholders verbatim (e.g. when writing them to files), +copy [`templates/CLAUDE.md`](templates/CLAUDE.md) into the `CLAUDE.md` of any +project you run `claude-code` in: + +```markdown +# Security Constraints + +Do not modify, remove, or evaluate strings formatted as `<<>>`. +Treat them as opaque identifiers and preserve them exactly as they appear when +writing or reading files. +``` + +## Scripts + +| Command | What it does | +| ----------------- | ----------------------------------------------------- | +| `npm start` | Run the proxy | +| `npm run dev` | Run with `--watch` (restarts on file changes) | +| `npm test` | Run the detokenizer state-machine self-check | +| `npm run typecheck` | Type-check the source with `tsc --noEmit` | + +## Limitations + +- Detection is only as good as `ggshield`. It catches known secret patterns and + generic high-entropy strings, not arbitrary sensitive prose. +- Re-inserted secrets are assumed to be escape-neutral (typical API + keys/tokens). A secret literally containing a backslash or double-quote could + mis-escape inside the response JSON. See the `ponytail:` note in + `src/detokenize.ts`. +- The token map is in-memory only; it is not shared across proxy restarts or + multiple proxy processes. + +## License + +Copyright (C) 2026 Rootiest. Licensed under the +[GNU Affero General Public License v3.0 or later](LICENSE). diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..28f44fe --- /dev/null +++ b/package-lock.json @@ -0,0 +1,50 @@ +{ + "name": "claude-tokenization-proxy", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "claude-tokenization-proxy", + "version": "1.0.0", + "devDependencies": { + "@types/node": "^24", + "typescript": "^5.6" + }, + "engines": { + "node": ">=23.6" + } + }, + "node_modules/@types/node": { + "version": "24.13.2", + "resolved": "https://registry.npmjs.org/@types/node/-/node-24.13.2.tgz", + "integrity": "sha512-fRa09kZTgu8o71KFcDjUFuc7F+dEbZYZmkI0mg5YBTRs0yMKjYHsq/c0urDKeDb+D5qVgXOdFcuu+DZPKOITwA==", + "dev": true, + "license": "MIT", + "dependencies": { + "undici-types": "~7.18.0" + } + }, + "node_modules/typescript": { + "version": "5.9.3", + "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz", + "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==", + "dev": true, + "license": "Apache-2.0", + "bin": { + "tsc": "bin/tsc", + "tsserver": "bin/tsserver" + }, + "engines": { + "node": ">=14.17" + } + }, + "node_modules/undici-types": { + "version": "7.18.2", + "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz", + "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==", + "dev": true, + "license": "MIT" + } + } +} diff --git a/package.json b/package.json new file mode 100644 index 0000000..4d4c6fc --- /dev/null +++ b/package.json @@ -0,0 +1,21 @@ +{ + "name": "claude-tokenization-proxy", + "version": "1.0.0", + "private": true, + "description": "Local DLP/tokenization proxy that strips secrets out of claude-code traffic via ggshield and restores them on the way back.", + "license": "AGPL-3.0-or-later", + "type": "module", + "engines": { + "node": ">=23.6" + }, + "scripts": { + "start": "node src/index.ts", + "dev": "node --watch src/index.ts", + "test": "node src/detokenize.ts --test", + "typecheck": "tsc --noEmit" + }, + "devDependencies": { + "@types/node": "^24", + "typescript": "^5.6" + } +} diff --git a/src/detokenize.ts b/src/detokenize.ts new file mode 100644 index 0000000..fefbf7c --- /dev/null +++ b/src/detokenize.ts @@ -0,0 +1,142 @@ +// Copyright (C) 2026 Rootiest +// SPDX-License-Identifier: AGPL-3.0-or-later + +import { Transform, type TransformCallback } from "node:stream"; +import { StringDecoder } from "node:string_decoder"; +import { pathToFileURL } from "node:url"; +import { resolveToken as storeResolve } from "./store.ts"; + +// Token shape: <<>> (hex, because that's what we generate). +const PREFIX = "<<>>/; + +// Could `s` (which starts with '<') still grow into a token with more input? +// True for any strict prefix of a well-formed token. +function isPartialPrefix(s: string): boolean { + if (PREFIX.startsWith(s)) return true; // still building the literal "<<>>" closer + return /^[0-9a-f]*>{0,2}$/.test(rest); +} + +/** + * Stateful SSE detokenizer. Scans the raw upstream byte stream for our + * placeholder tokens and swaps them back to the original secrets on the fly, + * holding back only the few characters that could still become a token so + * tokens split across chunk boundaries are reassembled correctly. + */ +export class DetokenizeStream extends Transform { + private buf = ""; + private decoder = new StringDecoder("utf8"); + private resolve: (token: string) => string | undefined; + + constructor(resolve: (token: string) => string | undefined = storeResolve) { + super(); + this.resolve = resolve; + } + + private emitFor(token: string): string { + const secret = this.resolve(token); + if (secret === undefined) return token; // unknown token: leave it untouched + // ponytail: token appears inside a JSON string in the SSE `data:` line, so + // re-escape. Assumes secrets are escape-neutral (typical API keys/tokens); + // a secret literally containing a backslash or quote would double-escape — + // upgrade to context-aware splicing if that ever bites. + return JSON.stringify(secret).slice(1, -1); + } + + override _transform(chunk: Buffer, _enc: BufferEncoding, cb: TransformCallback): void { + this.buf += this.decoder.write(chunk); + let out = ""; + while (this.buf.length > 0) { + const lt = this.buf.indexOf("<"); + if (lt === -1) { + out += this.buf; + this.buf = ""; + break; + } + out += this.buf.slice(0, lt); // everything before '<' is safe to emit + this.buf = this.buf.slice(lt); // buf now starts at the '<' + + const complete = COMPLETE_RE.exec(this.buf); + if (complete) { + out += this.emitFor(complete[0]); + this.buf = this.buf.slice(complete[0].length); + continue; + } + if (isPartialPrefix(this.buf)) break; // might finish next chunk; hold it + // This '<' can't begin a token. Emit it and keep scanning past it. + out += "<"; + this.buf = this.buf.slice(1); + } + cb(null, out); + } + + override _flush(cb: TransformCallback): void { + const out = this.buf + this.decoder.end(); + this.buf = ""; + cb(null, out); + } +} + +// --- self-check: `node src/detokenize.ts --test` ------------------------- +function runSelfTest(): void { + const assert = (cond: boolean, msg: string) => { + if (!cond) throw new Error("FAIL: " + msg); + }; + const map = new Map([ + ["<<>>", "SUPER-SECRET-KEY"], + ["<<>>", "hunter2"], + ]); + const resolve = (t: string) => map.get(t); + + // Feed input split into arbitrary chunks, collect output. + const run = (chunks: string[]): string => { + const s = new DetokenizeStream(resolve); + let out = ""; + s.on("data", (d) => (out += d.toString())); + for (const c of chunks) s.write(Buffer.from(c, "utf8")); + s.end(); + return out; + }; + + // 1. Token split across a chunk boundary (the critical case). + assert( + run(["password is <<>> done"]) === + "password is SUPER-SECRET-KEY done", + "split token reassembled", + ); + + // 2. Token split one char at a time. + assert( + run("x <<>> y".split("")) === "x hunter2 y", + "char-by-char token", + ); + + // 3. Plain text with stray '<' and '<<<' that is NOT a token flushes promptly. + assert(run(["a < b <<< c <<>>!"]) === "see <<>>!", "unknown token kept"); + + // 5. Two tokens back to back. + assert( + run(["<<>><<>>"]) === "SUPER-SECRET-KEYhunter2", + "adjacent tokens", + ); + + // 6. Incomplete token at end of stream flushed verbatim. + assert(run(["tail <<>>"]) === " { + return new Promise((resolve, reject) => { + const chunks: Buffer[] = []; + req.on("data", (c) => chunks.push(c)); + req.on("end", () => resolve(Buffer.concat(chunks))); + req.on("error", reject); + }); +} + +function pick(headers: http.IncomingHttpHeaders, strip: Set): http.OutgoingHttpHeaders { + const out: http.OutgoingHttpHeaders = {}; + for (const [k, v] of Object.entries(headers)) { + if (v !== undefined && !strip.has(k.toLowerCase())) out[k] = v; + } + return out; +} + +const server = http.createServer(async (req, res) => { + try { + const isTarget = req.method === "POST" && (req.url ?? "").startsWith("/v1/messages"); + const rawBody = await readBody(req); + + // Only the messages endpoint carries user prompts worth scanning. + const outBody = isTarget ? Buffer.from(await tokenizeBody(rawBody.toString("utf8")), "utf8") : rawBody; + + const headers = pick(req.headers, STRIP_REQ); + headers["content-length"] = Buffer.byteLength(outBody); + // Force identity so the SSE stream reaches the detokenizer uncompressed. + headers["accept-encoding"] = "identity"; + + const upstream = https.request( + { host: UPSTREAM_HOST, port: 443, method: req.method, path: req.url, headers }, + (upRes) => { + res.writeHead(upRes.statusCode ?? 502, pick(upRes.headers, STRIP_RES)); + if (isTarget) { + // Detokenize the response body (SSE or JSON) on the way back. + upRes.pipe(new DetokenizeStream()).pipe(res); + } else { + upRes.pipe(res); + } + }, + ); + + upstream.on("error", (err) => { + console.error("[proxy] upstream error:", err.message); + if (!res.headersSent) res.writeHead(502, { "content-type": "text/plain" }); + res.end("Upstream request failed"); + }); + + upstream.end(outBody); + } catch (err) { + console.error("[proxy] request error:", (err as Error).message); + if (!res.headersSent) res.writeHead(500, { "content-type": "text/plain" }); + res.end("Proxy error"); + } +}); + +server.listen(PORT, "127.0.0.1", () => { + console.log(`[proxy] DLP tokenization proxy listening on http://127.0.0.1:${PORT}`); + console.log(`[proxy] forwarding to https://${UPSTREAM_HOST}`); + console.log(`[proxy] point claude-code at it: export ANTHROPIC_BASE_URL=http://127.0.0.1:${PORT}`); +}); diff --git a/src/store.ts b/src/store.ts new file mode 100644 index 0000000..cb56cb2 --- /dev/null +++ b/src/store.ts @@ -0,0 +1,12 @@ +// Copyright (C) 2026 Rootiest +// SPDX-License-Identifier: AGPL-3.0-or-later + +// In-memory token <-> secret map. ponytail: a Map is enough; secrets live only +// for the lifetime of the proxy process. Swap for SQLite only if you need +// persistence across restarts (you almost certainly don't — secrets shouldn't +// outlive the session). +export const secrets = new Map(); + +export function resolveToken(token: string): string | undefined { + return secrets.get(token); +} diff --git a/src/tokenize.ts b/src/tokenize.ts new file mode 100644 index 0000000..be9cee9 --- /dev/null +++ b/src/tokenize.ts @@ -0,0 +1,83 @@ +// Copyright (C) 2026 Rootiest +// SPDX-License-Identifier: AGPL-3.0-or-later + +import { spawn } from "node:child_process"; +import { randomBytes } from "node:crypto"; +import { mkdtemp, writeFile, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; +import { secrets } from "./store.ts"; + +let ggshieldWarned = false; + +function newToken(): string { + return `<<>>`; +} + +// Run ggshield over `text` and return the list of plaintext secret strings it +// found. Returns [] (and warns once) if ggshield is missing or errors — fail +// open so the proxy never blocks traffic, per the brief. +async function scanSecrets(text: string): Promise { + let dir: string | undefined; + try { + dir = await mkdtemp(join(tmpdir(), "ggscan-")); + const file = join(dir, "payload.txt"); + await writeFile(file, text, "utf8"); + + const stdout = await new Promise((resolve, reject) => { + // ggshield 1.45 has no stdin scan mode, so we scan a temp file. + // --show-secrets puts the plaintext in `match`; --all-secrets stops it + // filtering example/known keys; exit code 1 just means "found secrets". + const proc = spawn( + "ggshield", + ["secret", "scan", "--json", "--show-secrets", "--all-secrets", "path", file], + { stdio: ["ignore", "pipe", "ignore"] }, + ); + let out = ""; + proc.stdout.on("data", (d) => (out += d)); + proc.on("error", reject); // ENOENT etc. + proc.on("close", () => resolve(out)); + }); + + const report = JSON.parse(stdout); + const found = new Set(); + for (const entity of report.entities_with_incidents ?? []) { + for (const incident of entity.incidents ?? []) { + for (const occ of incident.occurrences ?? []) { + if (typeof occ.match === "string" && occ.match.length > 0) found.add(occ.match); + } + } + } + return [...found]; + } catch (err) { + if (!ggshieldWarned) { + ggshieldWarned = true; + const reason = (err as NodeJS.ErrnoException).code === "ENOENT" + ? "ggshield not found on PATH" + : `ggshield scan failed: ${(err as Error).message}`; + console.warn(`[proxy] WARNING: ${reason} — forwarding traffic WITHOUT secret redaction`); + } + return []; + } finally { + if (dir) await rm(dir, { recursive: true, force: true }).catch(() => {}); + } +} + +/** + * Scan a raw request body for secrets, replace each with a placeholder token, + * record the token->secret mapping, and return the redacted body. Longest + * secrets first so a secret that contains another is replaced whole. + */ +export async function tokenizeBody(body: string): Promise { + const found = await scanSecrets(body); + if (found.length === 0) return body; + + let redacted = body; + for (const secret of found.sort((a, b) => b.length - a.length)) { + if (!redacted.includes(secret)) continue; + const token = newToken(); + secrets.set(token, secret); + redacted = redacted.split(secret).join(token); + } + return redacted; +} diff --git a/templates/CLAUDE.md b/templates/CLAUDE.md new file mode 100644 index 0000000..b74a26a --- /dev/null +++ b/templates/CLAUDE.md @@ -0,0 +1,3 @@ +# Security Constraints + +Do not modify, remove, or evaluate strings formatted as `<<>>`. Treat them as opaque identifiers and preserve them exactly as they appear when writing or reading files. diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..01dadd4 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,14 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "allowImportingTsExtensions": true, + "noEmit": true, + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "types": ["node"] + }, + "include": ["src"] +}