634 lines
23 KiB
JavaScript
634 lines
23 KiB
JavaScript
// dep-auditor.mjs — Deterministic dependency security scanner
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// Detects CVEs (npm/pip audit), typosquatting, malicious install scripts,
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// and unpinned versions. Zero external dependencies — Node.js builtins only.
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//
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// OWASP coverage: LLM03 (Supply Chain)
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import { finding, scannerResult } from './lib/output.mjs';
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import { SEVERITY } from './lib/severity.mjs';
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import { levenshtein } from './lib/string-utils.mjs';
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import { readFile } from 'node:fs/promises';
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import { join, dirname } from 'node:path';
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import { existsSync } from 'node:fs';
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import { execSync } from 'node:child_process';
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import { fileURLToPath } from 'node:url';
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// ---------------------------------------------------------------------------
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// Top-package knowledge base loader
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// ---------------------------------------------------------------------------
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const __dirname = dirname(fileURLToPath(import.meta.url));
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/** @type {{ npm: string[], pypi: string[] } | null} */
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let _topPackages = null;
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let _typosquatAllowlist = null;
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/**
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* Load top-packages.json from the knowledge directory.
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* Result is cached after first load.
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* @returns {Promise<{ npm: string[], pypi: string[] }>}
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*/
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async function loadTopPackages() {
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if (_topPackages) return _topPackages;
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const knowledgePath = join(__dirname, '..', 'knowledge', 'top-packages.json');
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try {
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const raw = await readFile(knowledgePath, 'utf8');
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_topPackages = JSON.parse(raw);
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} catch {
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// Graceful fallback: empty lists — typosquatting detection skipped
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_topPackages = { npm: [], pypi: [] };
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}
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return _topPackages;
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}
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async function loadTyposquatAllowlist() {
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if (_typosquatAllowlist) return _typosquatAllowlist;
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const allowPath = join(__dirname, '..', 'knowledge', 'typosquat-allowlist.json');
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try {
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const raw = await readFile(allowPath, 'utf8');
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const data = JSON.parse(raw);
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_typosquatAllowlist = {
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npm: new Set((data.npm || []).map(n => n.toLowerCase().replace(/[_.-]/g, '-'))),
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pypi: new Set((data.pypi || []).map(n => n.toLowerCase().replace(/[_.-]/g, '-'))),
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};
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} catch {
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_typosquatAllowlist = { npm: new Set(), pypi: new Set() };
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}
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return _typosquatAllowlist;
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}
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// ---------------------------------------------------------------------------
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// File reading helpers
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// ---------------------------------------------------------------------------
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/**
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* Read and parse a JSON file. Returns null on error.
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* @param {string} absPath
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* @returns {Promise<object|null>}
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*/
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async function readJson(absPath) {
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try {
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const raw = await readFile(absPath, 'utf8');
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return JSON.parse(raw);
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} catch {
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return null;
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}
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}
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/**
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* Read a text file line by line. Returns empty array on error.
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* @param {string} absPath
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* @returns {Promise<string[]>}
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*/
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async function readLines(absPath) {
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try {
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const raw = await readFile(absPath, 'utf8');
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return raw.split('\n').map(l => l.replace(/\r$/, ''));
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} catch {
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return [];
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}
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}
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// ---------------------------------------------------------------------------
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// Category 1: CVE Detection via npm/pip audit
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// ---------------------------------------------------------------------------
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/** Map npm audit severity strings to our SEVERITY constants. */
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function npmSeverityToOurs(npmSev) {
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switch (npmSev) {
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case 'critical': return SEVERITY.CRITICAL;
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case 'high': return SEVERITY.HIGH;
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case 'moderate': return SEVERITY.MEDIUM;
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case 'low':
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default: return SEVERITY.LOW;
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}
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}
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/**
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* Run npm audit --json in targetPath and return findings.
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* Gracefully handles: command not found, timeout, parse errors, non-zero exit.
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* @param {string} targetPath
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* @returns {object[]} findings
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*/
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function runNpmAudit(targetPath) {
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const findings = [];
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let raw;
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try {
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raw = execSync('npm audit --json', {
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cwd: targetPath,
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timeout: 30_000,
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// Allow non-zero exit (npm audit exits 1 when vulnerabilities found)
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stdio: ['ignore', 'pipe', 'ignore'],
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}).toString();
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} catch (err) {
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// execSync throws on non-zero exit; the stdout is still on err.stdout
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raw = err.stdout ? err.stdout.toString() : null;
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}
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if (!raw || raw.trim().length === 0) return findings;
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let parsed;
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try {
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parsed = JSON.parse(raw);
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} catch {
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return findings;
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}
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// npm audit v2 format: { vulnerabilities: { pkgName: { severity, via, ... } } }
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const vulns = parsed.vulnerabilities || {};
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for (const [pkgName, vuln] of Object.entries(vulns)) {
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const severity = npmSeverityToOurs(vuln.severity);
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// Collect CVE IDs from the via chain
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const cveIds = [];
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if (Array.isArray(vuln.via)) {
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for (const v of vuln.via) {
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if (typeof v === 'object' && v.url) {
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// Extract CVE or advisory ID from URL
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const match = v.url.match(/GHSA-[\w-]+|CVE-\d{4}-\d+/i);
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if (match) cveIds.push(match[0]);
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}
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}
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}
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const cveRef = cveIds.length > 0 ? ` (${cveIds.join(', ')})` : '';
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const fixAvailable = vuln.fixAvailable
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? typeof vuln.fixAvailable === 'object'
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? ` Fix: upgrade to ${vuln.fixAvailable.name}@${vuln.fixAvailable.version}.`
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: ' A fix is available — run `npm audit fix`.'
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: ' No automatic fix available — review manually.';
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findings.push(
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finding({
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scanner: 'DEP',
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severity,
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title: `Vulnerable npm dependency: ${pkgName}${cveRef}`,
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description:
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`npm audit reports a ${vuln.severity} severity vulnerability in "${pkgName}".` +
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(vuln.range ? ` Affected range: ${vuln.range}.` : '') +
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fixAvailable,
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file: 'package.json',
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evidence: cveIds.length > 0 ? cveIds.join(', ') : `${pkgName} @ ${vuln.range || 'unknown'}`,
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owasp: 'LLM03',
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recommendation:
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`Run \`npm audit fix\` or manually upgrade "${pkgName}" to a patched version. ` +
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'Review the advisory for workarounds if no fix is available.',
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}),
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);
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}
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return findings;
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}
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/**
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* Run pip audit --format json and return findings.
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* Gracefully handles pip audit not installed, timeout, parse errors.
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* @param {string} targetPath
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* @returns {object[]} findings
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*/
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function runPipAudit(targetPath) {
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const findings = [];
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let raw;
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try {
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raw = execSync('pip audit --format json', {
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cwd: targetPath,
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timeout: 30_000,
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stdio: ['ignore', 'pipe', 'ignore'],
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}).toString();
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} catch (err) {
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raw = err.stdout ? err.stdout.toString() : null;
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}
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if (!raw || raw.trim().length === 0) return findings;
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let parsed;
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try {
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parsed = JSON.parse(raw);
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} catch {
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return findings;
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}
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// pip audit JSON format: array of { name, version, vulns: [{ id, fix_versions, description }] }
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const packages = Array.isArray(parsed) ? parsed : (parsed.dependencies || []);
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for (const pkg of packages) {
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if (!pkg.vulns || pkg.vulns.length === 0) continue;
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for (const vuln of pkg.vulns) {
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const fixes = vuln.fix_versions && vuln.fix_versions.length > 0
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? ` Fix in version(s): ${vuln.fix_versions.join(', ')}.`
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: ' No fix version reported.';
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findings.push(
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finding({
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scanner: 'DEP',
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severity: SEVERITY.HIGH, // pip audit does not expose severity; default HIGH
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title: `Vulnerable Python dependency: ${pkg.name} (${vuln.id})`,
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description:
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`pip audit reports vulnerability ${vuln.id} in "${pkg.name}" v${pkg.version}.` +
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(vuln.description ? ` ${vuln.description}` : '') +
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fixes,
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file: 'requirements.txt',
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evidence: `${vuln.id} — ${pkg.name}@${pkg.version}`,
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owasp: 'LLM03',
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recommendation:
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`Upgrade "${pkg.name}" to a patched version.${fixes} ` +
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'Run `pip audit` after upgrading to verify resolution.',
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}),
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);
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}
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}
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return findings;
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}
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// ---------------------------------------------------------------------------
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// Category 2: Typosquatting Detection
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// ---------------------------------------------------------------------------
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/**
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* Extract package names from requirements.txt lines.
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* Handles: pkg==1.0, pkg>=1.0, pkg~=1.0, pkg, # comments, -r includes, blanks.
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* @param {string[]} lines
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* @returns {string[]}
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*/
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function parseRequirementsTxt(lines) {
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const names = [];
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for (const line of lines) {
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const stripped = line.trim();
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// Skip blanks, comments, options, includes
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if (!stripped || stripped.startsWith('#') || stripped.startsWith('-')) continue;
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// Extract package name: everything before first [>=<!~;@\s]
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const match = stripped.match(/^([A-Za-z0-9]([A-Za-z0-9._-]*[A-Za-z0-9])?)/);
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if (match) names.push(match[1].toLowerCase().replace(/_/g, '-'));
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}
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return names;
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}
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/**
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* Check one declared package name against the top-packages list for typosquatting.
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* Pre-filter by length difference to avoid O(n*m) full distance for irrelevant pairs.
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* Returns a finding object or null.
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*
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* @param {string} declaredName - Normalized (lowercase, hyphens) declared package name
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* @param {string[]} topList - Top package names (same normalization)
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* @param {number} top200Cutoff - Index cutoff for "very popular" (top 200 for npm, top 100 for PyPI)
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* @param {string} ecosystem - 'npm' or 'pypi'
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* @param {string} sourceFile - 'package.json' or 'requirements.txt'
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* @returns {object|null}
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*/
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function checkTyposquatting(declaredName, topList, top200Cutoff, ecosystem, sourceFile, allowlist) {
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// Skip known legitimate packages
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if (allowlist && allowlist.has(declaredName)) return null;
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let closestDist = Infinity;
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let closestPkg = null;
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let closestIdx = Infinity;
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for (let i = 0; i < topList.length; i++) {
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const topPkg = topList[i];
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// Exact match — legitimate package, skip
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if (declaredName === topPkg) return null;
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// Pre-filter: skip if length difference > 2
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if (Math.abs(declaredName.length - topPkg.length) > 2) continue;
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const dist = levenshtein(declaredName, topPkg);
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if (dist < closestDist || (dist === closestDist && i < closestIdx)) {
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closestDist = dist;
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closestPkg = topPkg;
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closestIdx = i;
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}
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}
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if (closestPkg === null) return null;
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// Flag distance 1 always; distance 2 only if target is in top 200 (top200Cutoff)
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if (closestDist === 1) {
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return finding({
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scanner: 'DEP',
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severity: SEVERITY.HIGH,
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title: `Possible typosquatting: "${declaredName}" vs "${closestPkg}" (edit distance 1)`,
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description:
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`The declared ${ecosystem} package "${declaredName}" is 1 character away from the ` +
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`popular package "${closestPkg}". This is a strong typosquatting indicator. ` +
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`Typosquatting packages impersonate popular libraries to execute malicious install scripts.`,
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file: sourceFile,
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evidence: `"${declaredName}" → closest match "${closestPkg}" (Levenshtein distance: 1)`,
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owasp: 'LLM03',
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recommendation:
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`Verify that "${declaredName}" is the intended package. If you meant "${closestPkg}", ` +
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`correct the dependency name. If "${declaredName}" is intentional, add an inline comment ` +
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`confirming this to suppress future alerts.`,
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});
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}
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if (closestDist === 2 && closestIdx < top200Cutoff) {
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return finding({
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scanner: 'DEP',
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severity: SEVERITY.MEDIUM,
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title: `Potential typosquatting: "${declaredName}" vs "${closestPkg}" (edit distance 2)`,
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description:
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`The declared ${ecosystem} package "${declaredName}" is 2 characters away from the ` +
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`highly popular package "${closestPkg}" (top ${top200Cutoff} by downloads). ` +
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`While less certain than distance-1 matches, this warrants manual verification.`,
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file: sourceFile,
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evidence: `"${declaredName}" → closest match "${closestPkg}" (Levenshtein distance: 2)`,
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owasp: 'LLM03',
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recommendation:
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`Confirm "${declaredName}" is the correct and intended package name. ` +
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`Check the package's publish date, author, and download count on the registry.`,
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});
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}
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return null;
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}
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// ---------------------------------------------------------------------------
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// Category 3: Malicious Install Scripts
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// ---------------------------------------------------------------------------
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/** Patterns in install script values that indicate network/exec behaviour. */
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const MALICIOUS_SCRIPT_PATTERNS = [
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{ pattern: /\bcurl\b/, label: 'curl (network fetch)' },
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{ pattern: /\bwget\b/, label: 'wget (network fetch)' },
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{ pattern: /\bfetch\b/, label: 'fetch (network request)' },
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{ pattern: /https?:\/\//, label: 'HTTP URL' },
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{ pattern: /\beval\b/, label: 'eval (code execution)' },
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{ pattern: /\bexec\b/, label: 'exec (process execution)' },
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{ pattern: /child_process/, label: 'child_process (subprocess)' },
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{ pattern: /net\.connect\b/, label: 'net.connect (raw TCP)' },
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{ pattern: /\bdgram\b/, label: 'dgram (UDP socket)' },
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];
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/** npm lifecycle hooks that run automatically on install. */
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const INSTALL_HOOKS = ['preinstall', 'install', 'postinstall'];
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/**
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* Check package.json scripts for malicious install script patterns.
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* @param {object} pkgJson - Parsed package.json object
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* @returns {object[]} - findings
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*/
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function checkInstallScripts(pkgJson) {
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const findings = [];
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const scripts = pkgJson.scripts || {};
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for (const hook of INSTALL_HOOKS) {
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const script = scripts[hook];
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if (!script || typeof script !== 'string') continue;
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const matched = MALICIOUS_SCRIPT_PATTERNS.filter(({ pattern }) => pattern.test(script));
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if (matched.length === 0) continue;
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const labels = matched.map(m => m.label).join(', ');
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// Redact any URLs in the evidence to avoid leaking sensitive paths in reports
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const safeScript = script.replace(/https?:\/\/[^\s"']+/g, '[URL]').slice(0, 120);
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findings.push(
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finding({
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scanner: 'DEP',
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severity: SEVERITY.HIGH,
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title: `Suspicious npm install hook: scripts.${hook} contains network/exec patterns`,
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description:
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`The package.json "scripts.${hook}" field runs automatically during \`npm install\` ` +
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`and contains suspicious patterns: ${labels}. ` +
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`Malicious packages use install hooks to exfiltrate data, download payloads, or establish persistence.`,
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file: 'package.json',
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evidence: `scripts.${hook}: "${safeScript}${script.length > 120 ? '...' : ''}"`,
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owasp: 'LLM03',
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recommendation:
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`Review the scripts.${hook} command carefully. If this package is a dependency ` +
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`(not your own), consider whether this behaviour is expected. Use \`npm install --ignore-scripts\` ` +
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`if install hooks are not needed. File a report at https://www.npmjs.com/support if malicious.`,
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}),
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);
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}
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return findings;
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}
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// ---------------------------------------------------------------------------
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// Category 4: Unpinned Versions
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// ---------------------------------------------------------------------------
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/** Flags for unpinned npm dependency specifiers. */
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const UNPINNED_NPM_RE = /^(\*|latest|x|>=\d|>\d)/;
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/**
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* Check package.json dependencies for unpinned version specifiers.
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* @param {object} pkgJson
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* @returns {object[]}
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*/
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function checkUnpinnedNpm(pkgJson) {
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const findings = [];
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const depSections = [
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['dependencies', pkgJson.dependencies],
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['devDependencies', pkgJson.devDependencies],
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];
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for (const [sectionName, deps] of depSections) {
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if (!deps || typeof deps !== 'object') continue;
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for (const [name, version] of Object.entries(deps)) {
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if (typeof version !== 'string') continue;
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if (UNPINNED_NPM_RE.test(version.trim())) {
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findings.push(
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finding({
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scanner: 'DEP',
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severity: SEVERITY.LOW,
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title: `Unpinned npm dependency: ${name}@${version}`,
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description:
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`The package "${name}" in ${sectionName} uses an unpinned version specifier "${version}". ` +
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`Unpinned dependencies can silently pull in a compromised version on the next install.`,
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file: 'package.json',
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evidence: `${sectionName}.${name}: "${version}"`,
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owasp: 'LLM03',
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recommendation:
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`Pin "${name}" to an exact version (e.g., "${name}": "x.y.z") or use a lockfile ` +
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`(\`package-lock.json\` or \`yarn.lock\`) and commit it. Run \`npm ci\` in CI instead of \`npm install\`.`,
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}),
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);
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}
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}
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}
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return findings;
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}
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/**
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* Check requirements.txt lines for unpinned packages (missing == pin).
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* @param {string[]} lines
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* @returns {object[]}
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*/
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function checkUnpinnedPypi(lines) {
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const findings = [];
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i].trim();
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if (!line || line.startsWith('#') || line.startsWith('-')) continue;
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// Has a version specifier but NOT a strict == pin
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const hasSpecifier = /[><=~!]/.test(line);
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const hasPinned = /==/.test(line);
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const hasAnyOperator = hasSpecifier;
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if (!hasPinned && !hasAnyOperator) {
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// No version at all
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const match = line.match(/^([A-Za-z0-9][A-Za-z0-9._-]*)/);
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const name = match ? match[1] : line;
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findings.push(
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finding({
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scanner: 'DEP',
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severity: SEVERITY.LOW,
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title: `Unpinned Python dependency: ${name} (no version specifier)`,
|
|
description:
|
|
`"${name}" in requirements.txt has no version pin. ` +
|
|
`Without pinning, \`pip install\` may resolve to a future compromised version.`,
|
|
file: 'requirements.txt',
|
|
line: i + 1,
|
|
evidence: line,
|
|
owasp: 'LLM03',
|
|
recommendation:
|
|
`Pin to an exact version: \`${name}==<version>\`. ` +
|
|
`Use \`pip freeze > requirements.txt\` to capture current versions, ` +
|
|
`or use \`pip-compile\` (pip-tools) for reproducible builds.`,
|
|
}),
|
|
);
|
|
} else if (hasSpecifier && !hasPinned) {
|
|
// Has >= or ~= but no == — floating upper bound
|
|
const match = line.match(/^([A-Za-z0-9][A-Za-z0-9._-]*)/);
|
|
const name = match ? match[1] : line;
|
|
findings.push(
|
|
finding({
|
|
scanner: 'DEP',
|
|
severity: SEVERITY.LOW,
|
|
title: `Loosely pinned Python dependency: ${name}`,
|
|
description:
|
|
`"${name}" in requirements.txt uses a range specifier without a strict == pin. ` +
|
|
`Range specifiers allow unexpected version upgrades that may introduce vulnerabilities.`,
|
|
file: 'requirements.txt',
|
|
line: i + 1,
|
|
evidence: line,
|
|
owasp: 'LLM03',
|
|
recommendation:
|
|
`Prefer exact version pinning (\`${name}==x.y.z\`) for reproducible installs. ` +
|
|
`If you need flexibility, use a lockfile approach (\`pip-compile\`).`,
|
|
}),
|
|
);
|
|
}
|
|
}
|
|
|
|
return findings;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Main scanner export
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Scan targetPath for dependency security issues.
|
|
*
|
|
* Detection categories:
|
|
* 1. CVE Detection via npm audit / pip audit (CRITICAL / HIGH)
|
|
* 2. Typosquatting against top-200 npm / top-100 PyPI (HIGH / MEDIUM)
|
|
* 3. Malicious install scripts in package.json (HIGH)
|
|
* 4. Unpinned version specifiers (LOW)
|
|
*
|
|
* @param {string} targetPath - Absolute root path being scanned
|
|
* @param {object} discovery - Unused (dep-auditor reads files by convention, not discovery list)
|
|
* @returns {Promise<object>} - scannerResult envelope
|
|
*/
|
|
export async function scan(targetPath, discovery) {
|
|
const startMs = Date.now();
|
|
const findings = [];
|
|
let filesScanned = 0;
|
|
|
|
// Detect which ecosystems are present
|
|
const pkgJsonPath = join(targetPath, 'package.json');
|
|
const requirementsTxt = join(targetPath, 'requirements.txt');
|
|
const setupPy = join(targetPath, 'setup.py');
|
|
const pyprojectToml = join(targetPath, 'pyproject.toml');
|
|
|
|
const hasNpm = existsSync(pkgJsonPath);
|
|
const hasPypi = existsSync(requirementsTxt) || existsSync(setupPy) || existsSync(pyprojectToml);
|
|
|
|
// Nothing to scan
|
|
if (!hasNpm && !hasPypi) {
|
|
return scannerResult('dep-auditor', 'skipped', [], 0, Date.now() - startMs);
|
|
}
|
|
|
|
try {
|
|
// -----------------------------------------------------------------------
|
|
// npm ecosystem
|
|
// -----------------------------------------------------------------------
|
|
if (hasNpm) {
|
|
filesScanned++;
|
|
const pkgJson = await readJson(pkgJsonPath);
|
|
|
|
if (pkgJson) {
|
|
// 1a. CVE via npm audit
|
|
findings.push(...runNpmAudit(targetPath));
|
|
|
|
// 2a. Typosquatting — npm
|
|
const [topPkgs, allowlist] = await Promise.all([loadTopPackages(), loadTyposquatAllowlist()]);
|
|
const npmTop = topPkgs.npm.map(n => n.toLowerCase().replace(/_/g, '-'));
|
|
const allDeps = {
|
|
...pkgJson.dependencies,
|
|
...pkgJson.devDependencies,
|
|
};
|
|
for (const dep of Object.keys(allDeps)) {
|
|
const normalized = dep.toLowerCase().replace(/_/g, '-');
|
|
const f = checkTyposquatting(normalized, npmTop, 200, 'npm', 'package.json', allowlist.npm);
|
|
if (f) findings.push(f);
|
|
}
|
|
|
|
// 3. Malicious install scripts
|
|
findings.push(...checkInstallScripts(pkgJson));
|
|
|
|
// 4a. Unpinned versions
|
|
findings.push(...checkUnpinnedNpm(pkgJson));
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------
|
|
// PyPI ecosystem
|
|
// -----------------------------------------------------------------------
|
|
if (hasPypi) {
|
|
// 1b. CVE via pip audit (only if requirements.txt or pyproject.toml present)
|
|
if (existsSync(requirementsTxt) || existsSync(pyprojectToml)) {
|
|
findings.push(...runPipAudit(targetPath));
|
|
}
|
|
|
|
// 2b. Typosquatting — PyPI (only if requirements.txt present)
|
|
if (existsSync(requirementsTxt)) {
|
|
filesScanned++;
|
|
const reqLines = await readLines(requirementsTxt);
|
|
const topPkgs2 = await loadTopPackages();
|
|
const allowlist2 = await loadTyposquatAllowlist();
|
|
const pypiTop = topPkgs2.pypi.map(n => n.toLowerCase().replace(/_/g, '-'));
|
|
const declaredPypi = parseRequirementsTxt(reqLines);
|
|
|
|
for (const dep of declaredPypi) {
|
|
const f = checkTyposquatting(dep, pypiTop, 100, 'pypi', 'requirements.txt', allowlist2.pypi);
|
|
if (f) findings.push(f);
|
|
}
|
|
|
|
// 4b. Unpinned versions
|
|
findings.push(...checkUnpinnedPypi(reqLines));
|
|
}
|
|
}
|
|
|
|
const durationMs = Date.now() - startMs;
|
|
return scannerResult('dep-auditor', 'ok', findings, filesScanned, durationMs);
|
|
|
|
} catch (err) {
|
|
const durationMs = Date.now() - startMs;
|
|
return scannerResult(
|
|
'dep-auditor',
|
|
'error',
|
|
findings,
|
|
filesScanned,
|
|
durationMs,
|
|
err.message,
|
|
);
|
|
}
|
|
}
|