Initial commit: Elydora Open Source — self-hosted audit platform for AI agents
Full self-hosted port of the Elydora tamper-evident audit protocol: - Hono API server with PostgreSQL, Redis, MinIO adapters - Ed25519 signed operations, chain hashing, Merkle epoch rollups - PBKDF2 password hashing, HMAC-SHA256 JWT, 5-role RBAC - Next.js management console - Node.js, Python, and Go SDKs - Docker Compose for local deployment - Helm chart for Kubernetes - Comprehensive security hardening and audit fixes applied Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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ZacharyZhang-NYandClaude Opus 4.6 committed
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/**
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* Generates a self-contained Node.js hook script that embeds all crypto logic
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* inline so it has zero runtime dependency on the SDK.
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*/
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export function generateHookScript(agentName: string, agentId: string): string {
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return `#!/usr/bin/env node
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'use strict';
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// ---------------------------------------------------------------------------
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// Self-contained Elydora audit hook for: ${agentName}
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// Generated by @elydora/sdk — DO NOT EDIT
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// ---------------------------------------------------------------------------
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const crypto = require('node:crypto');
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const fs = require('node:fs');
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const path = require('node:path');
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const os = require('node:os');
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const AGENT_NAME = ${JSON.stringify(agentName)};
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const AGENT_ID = ${JSON.stringify(agentId)};
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const ELYDORA_DIR = path.join(os.homedir(), '.elydora');
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const CONFIG_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'config.json');
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const KEY_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'private.key');
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const CHAIN_STATE_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'chain-state.json');
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const ERROR_LOG_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'error.log');
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// ---------------------------------------------------------------------------
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// Embedded crypto (from @elydora/sdk src/crypto.ts + src/utils.ts)
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// ---------------------------------------------------------------------------
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function base64urlEncode(data) {
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const buf = Buffer.isBuffer(data) ? data : Buffer.from(data);
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return buf.toString('base64url');
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}
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function jcsCanonicalise(value) {
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if (value === null || value === undefined) return 'null';
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if (typeof value === 'boolean' || typeof value === 'number') return JSON.stringify(value);
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if (typeof value === 'string') return JSON.stringify(value);
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if (Array.isArray(value)) {
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return '[' + value.map(v => jcsCanonicalise(v)).join(',') + ']';
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}
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if (typeof value === 'object') {
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const keys = Object.keys(value).sort();
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const pairs = [];
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for (const key of keys) {
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if (value[key] !== undefined) {
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pairs.push(JSON.stringify(key) + ':' + jcsCanonicalise(value[key]));
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}
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}
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return '{' + pairs.join(',') + '}';
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}
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return JSON.stringify(value);
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}
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function sha256Base64url(data) {
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const input = typeof data === 'string' ? Buffer.from(data, 'utf-8') : data;
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return base64urlEncode(crypto.createHash('sha256').update(input).digest());
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}
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function computePayloadHash(payload) {
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return sha256Base64url(jcsCanonicalise(payload));
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}
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function computeChainHash(prevChainHash, payloadHash, operationId, issuedAt) {
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const input = prevChainHash + '|' + payloadHash + '|' + operationId + '|' + issuedAt;
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return sha256Base64url(input);
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}
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const PKCS8_ED25519_PREFIX = Buffer.from([
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0x30, 0x2e, 0x02, 0x01, 0x00, 0x30, 0x05,
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0x06, 0x03, 0x2b, 0x65, 0x70, 0x04, 0x22, 0x04, 0x20,
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]);
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function signEd25519(privateKeyBase64url, data) {
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const seed = Buffer.from(privateKeyBase64url, 'base64url');
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const pkcs8 = Buffer.concat([PKCS8_ED25519_PREFIX, seed]);
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const keyObject = crypto.createPrivateKey({ key: pkcs8, format: 'der', type: 'pkcs8' });
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const signature = crypto.sign(null, data, keyObject);
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return base64urlEncode(signature);
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}
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const ZERO_CHAIN_HASH = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';
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function uuidv7() {
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const now = Date.now();
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const random = crypto.randomBytes(10);
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const bytes = Buffer.alloc(16);
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bytes[0] = (now / 2 ** 40) & 0xff;
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bytes[1] = (now / 2 ** 32) & 0xff;
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bytes[2] = (now / 2 ** 24) & 0xff;
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bytes[3] = (now / 2 ** 16) & 0xff;
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bytes[4] = (now / 2 ** 8) & 0xff;
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bytes[5] = now & 0xff;
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bytes[6] = 0x70 | (random[0] & 0x0f);
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bytes[7] = random[1];
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bytes[8] = 0x80 | (random[2] & 0x3f);
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bytes[9] = random[3];
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bytes[10] = random[4];
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bytes[11] = random[5];
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bytes[12] = random[6];
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bytes[13] = random[7];
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bytes[14] = random[8];
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bytes[15] = random[9];
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const hex = bytes.toString('hex');
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return (
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hex.slice(0, 8) + '-' +
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hex.slice(8, 12) + '-' +
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hex.slice(12, 16) + '-' +
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hex.slice(16, 20) + '-' +
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hex.slice(20, 32)
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);
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}
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function generateNonce() {
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return base64urlEncode(crypto.randomBytes(16));
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}
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// ---------------------------------------------------------------------------
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// Chain state persistence (atomic writes)
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// ---------------------------------------------------------------------------
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function readChainState() {
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try {
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const raw = fs.readFileSync(CHAIN_STATE_PATH, 'utf-8');
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const state = JSON.parse(raw);
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return state.prev_chain_hash || ZERO_CHAIN_HASH;
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} catch {
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return ZERO_CHAIN_HASH;
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}
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}
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function writeChainState(chainHash) {
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const tmpPath = CHAIN_STATE_PATH + '.tmp';
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fs.writeFileSync(tmpPath, JSON.stringify({ prev_chain_hash: chainHash }), 'utf-8');
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try {
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fs.renameSync(tmpPath, CHAIN_STATE_PATH);
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} catch (err) {
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if (err.code === 'EPERM' || err.code === 'EEXIST') {
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try { fs.unlinkSync(CHAIN_STATE_PATH); } catch { /* ignore */ }
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fs.renameSync(tmpPath, CHAIN_STATE_PATH);
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} else {
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throw err;
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Error logging
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// ---------------------------------------------------------------------------
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function logError(err) {
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try {
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const ts = new Date().toISOString();
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const msg = ts + ' [' + AGENT_NAME + '] ' + (err.stack || err.message || String(err)) + '\\n';
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fs.appendFileSync(ERROR_LOG_PATH, msg, 'utf-8');
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} catch {
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// Silently ignore logging failures
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}
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}
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// ---------------------------------------------------------------------------
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// Main hook logic
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// ---------------------------------------------------------------------------
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async function main() {
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try {
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// Read JSON from stdin
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const chunks = [];
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for await (const chunk of process.stdin) {
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chunks.push(chunk);
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}
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const rawInput = Buffer.concat(chunks).toString('utf-8').trim();
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if (!rawInput) return;
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let hookData;
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try {
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hookData = JSON.parse(rawInput);
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} catch {
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return;
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}
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// Extract tool_name and tool_input from hook data
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// Different agents may pass data in different shapes
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const toolName = hookData.tool_name || hookData.toolName || hookData.name || 'unknown';
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const toolInput = hookData.tool_input || hookData.toolInput || hookData.input || hookData.parameters || {};
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const sessionId = hookData.session_id || hookData.sessionId || hookData.session || 'unknown';
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// Read agent config and private key
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let config;
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let privateKey;
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try {
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config = JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf-8'));
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privateKey = fs.readFileSync(KEY_PATH, 'utf-8').trim();
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} catch (err) {
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logError(new Error('Failed to read agent config/key: ' + err.message));
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return;
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}
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const orgId = config.org_id;
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const agentId = config.agent_id;
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const kid = config.kid;
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const baseUrl = (config.base_url || 'https://api.elydora.com').replace(/\\/+$/, '');
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const token = config.token || '';
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// Read chain state
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const prevChainHash = readChainState();
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// Build EOR
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const operationId = uuidv7();
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const issuedAt = Date.now();
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const nonce = generateNonce();
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const payload = {
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tool_name: toolName,
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tool_input: toolInput,
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session_id: sessionId,
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};
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const payloadHash = computePayloadHash(payload);
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const chainHash = computeChainHash(prevChainHash, payloadHash, operationId, issuedAt);
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const eorWithoutSig = {
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op_version: '1.0',
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operation_id: operationId,
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org_id: orgId,
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agent_id: agentId,
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issued_at: issuedAt,
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ttl_ms: 30000,
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nonce: nonce,
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operation_type: 'ai.tool_use',
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subject: { session_id: sessionId },
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action: { tool: toolName },
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payload: payload,
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payload_hash: payloadHash,
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prev_chain_hash: prevChainHash,
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agent_pubkey_kid: kid,
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};
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const canonical = jcsCanonicalise(eorWithoutSig);
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const signature = signEd25519(privateKey, Buffer.from(canonical, 'utf-8'));
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const eor = Object.assign({}, eorWithoutSig, { chain_hash: chainHash, signature: signature });
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// POST to /v1/operations (5s timeout)
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// Only update local chain state on success to prevent desync
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const url = baseUrl + '/v1/operations';
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const controller = new AbortController();
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const timeout = setTimeout(() => controller.abort(), 5000);
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try {
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const headers = {
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'Content-Type': 'application/json',
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'Accept': 'application/json',
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};
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if (token) {
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headers['Authorization'] = 'Bearer ' + token;
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}
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const res = await fetch(url, {
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method: 'POST',
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headers: headers,
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body: JSON.stringify(eor),
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signal: controller.signal,
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});
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if (res.ok) {
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// Server accepted — safe to advance local chain state
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writeChainState(chainHash);
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} else if (res.status === 400) {
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// Possible chain hash mismatch — try to resync from server response
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try {
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const errBody = await res.json();
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if (errBody.error && errBody.error.code === 'PREV_HASH_MISMATCH') {
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// Extract the expected hash from the error message
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const match = (errBody.error.message || '').match(/Expected prev_chain_hash "([^"]+)"/);
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if (match) {
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writeChainState(match[1]);
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logError(new Error('Chain hash resynced to server: ' + match[1]));
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}
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}
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} catch { /* ignore parse errors */ }
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}
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} catch {
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// Network error — don't advance chain state, will retry with same prev_chain_hash
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} finally {
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clearTimeout(timeout);
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}
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} catch (err) {
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logError(err);
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}
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}
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main();
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`;
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}
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/**
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* Generates a lightweight PreToolUse guard script that checks if the agent
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* is frozen and blocks tool execution if so.
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*
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* - Caches the agent status locally (60s TTL) to avoid hitting the API on every tool call
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* - Fails open: if the API is unreachable, tool execution is allowed
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* - If frozen: exits with code 1 to block the tool
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*/
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export function generateGuardScript(agentName: string, agentId: string): string {
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return `#!/usr/bin/env node
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'use strict';
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// ---------------------------------------------------------------------------
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// Elydora agent guard (PreToolUse) for: ${agentName}
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// Generated by @elydora/sdk — DO NOT EDIT
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// ---------------------------------------------------------------------------
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const fs = require('node:fs');
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const path = require('node:path');
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const os = require('node:os');
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const AGENT_NAME = ${JSON.stringify(agentName)};
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const AGENT_ID = ${JSON.stringify(agentId)};
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const ELYDORA_DIR = path.join(os.homedir(), '.elydora');
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const CONFIG_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'config.json');
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const STATUS_CACHE_PATH = path.join(ELYDORA_DIR, AGENT_ID, 'status-cache.json');
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const CACHE_TTL_MS = 60000; // 60 seconds
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// Discard stdin immediately so the process can exit cleanly
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process.stdin.destroy();
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async function main() {
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// Read agent config
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let config;
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try {
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config = JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf-8'));
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} catch {
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return; // Can't read config — fail-open (allow)
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}
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// Check cached status
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try {
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const raw = fs.readFileSync(STATUS_CACHE_PATH, 'utf-8');
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const cache = JSON.parse(raw);
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const age = Date.now() - (cache.cached_at || 0);
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if (age < CACHE_TTL_MS) {
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if (cache.status === 'frozen') {
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process.stderr.write('Agent "' + AGENT_NAME + '" is frozen by Elydora. Tool execution blocked.\\n');
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process.exitCode = 2;
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}
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return; // Cache is fresh — use cached result
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}
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} catch {
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// No cache or invalid — need to check API
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}
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// Fetch agent status from API
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const baseUrl = (config.base_url || 'https://api.elydora.com').replace(/\\/+$/, '');
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const token = config.token || '';
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const agentId = config.agent_id;
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try {
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const controller = new AbortController();
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const timeout = setTimeout(() => controller.abort(), 3000);
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const headers = { 'Accept': 'application/json' };
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if (token) {
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headers['Authorization'] = 'Bearer ' + token;
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}
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const res = await fetch(baseUrl + '/v1/agents/' + encodeURIComponent(agentId), {
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headers: headers,
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signal: controller.signal,
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});
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clearTimeout(timeout);
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if (res.ok) {
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const data = await res.json();
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const agentStatus = (data.agent && data.agent.status) || 'active';
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// Update cache
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try {
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fs.writeFileSync(STATUS_CACHE_PATH, JSON.stringify({
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status: agentStatus,
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cached_at: Date.now(),
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}), 'utf-8');
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} catch {
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// Ignore cache write failures
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}
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if (agentStatus === 'frozen') {
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process.stderr.write('Agent "' + AGENT_NAME + '" is frozen by Elydora. Tool execution blocked.\\n');
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process.exitCode = 2;
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}
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}
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} catch {
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// API unreachable — fail-open (allow)
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}
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}
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main();
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`;
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}
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Reference in new issue
Block a user