feat(security): implement attack surface exposure prevention (inst_084)
Adds comprehensive protection against exposing internal implementation details in public-facing documentation. New Governance Rule (inst_084): - Quadrant: SYSTEM - Persistence: HIGH - Scope: Public documents (confidential:false) - Enforcement: Pre-commit hooks (mandatory) Implementation: 1. attack-surface-validator.util.js - Pattern detection for file paths, API endpoints, admin URLs, ports - Frontmatter parsing (respects confidential:true exemption) - Code block exemption (doesn't flag technical examples) - Intelligent line numbering for violation reporting 2. check-attack-surface.js - Pre-commit script that scans staged documents - User-friendly violation reporting with suggestions - Integration with git workflow 3. Pre-commit hook integration - Added as Check #3 in git hooks - Runs after prohibited terms, before test requirements - Blocks commits with attack surface exposures Detection Patterns: ✅ File paths: src/*, public/*, scripts/* ✅ API endpoints: /api/*, /admin/* ✅ File naming patterns: *.util.js, *.service.js ✅ Port numbers in prose ✅ Connection strings Exemptions: - Code blocks (```) - Inline code (`) - Confidential documents (confidential:true) - Internal technical documentation Security Rationale (Defense-in-Depth): - Prevents reconnaissance by obscuring architecture - Reduces attack surface by hiding implementation paths - Complements credential protection (inst_069/070) - Part of layered security strategy (inst_072) Testing: - Validated against test document with known exposures - 7 violations detected correctly - Code block exemption verified - All expected pattern types detected Example Violations Blocked: ❌ "Dashboard at /admin/audit-analytics.html" ✅ "Administrative Dashboard" ❌ "GET /api/admin/audit-logs endpoint" ✅ "Authenticated API for audit data" ❌ "In activity-classifier.util.js" ✅ "The activity classifier" This enforcement prevented the exact security issue discovered in governance-bi-tools.md which exposed admin paths and API endpoints. Also fixed prohibited terms checker to exempt instruction-history.json (which contains prohibited term DEFINITIONS, not violations). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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66
scripts/add-attack-surface-rule.js
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scripts/add-attack-surface-rule.js
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#!/usr/bin/env node
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/**
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* Add Attack Surface Exposure Prevention Rule (inst_084)
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*/
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const fs = require('fs');
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const path = require('path');
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const historyPath = path.join(__dirname, '../.claude/instruction-history.json');
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const data = JSON.parse(fs.readFileSync(historyPath, 'utf8'));
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const newInstruction = {
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"id": "inst_084",
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"text": "NEVER expose internal implementation details in public-facing documents (confidential:false). Block exact file paths, API endpoints, database schemas, port numbers, and internal URLs. Use generalized component names instead.",
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"timestamp": new Date().toISOString(),
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"quadrant": "SYSTEM",
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"persistence": "HIGH",
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"temporal_scope": "PERMANENT",
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"verification_required": "MANDATORY",
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"explicitness": 1.0,
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"source": "security_requirement",
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"session_id": "2025-10-27-attack-surface-prevention",
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"parameters": {
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"security_layer": "defense_in_depth",
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"enforcement": "pre_commit_hook",
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"scope": "public_documents"
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},
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"active": true,
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"notes": "Prevents reconnaissance by obscuring internal architecture in public documentation. Part of defense-in-depth security strategy (inst_072).",
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"examples": [
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"❌ BAD: 'Dashboard at /admin/audit-analytics.html'",
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"✅ GOOD: 'Administrative Dashboard'",
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"❌ BAD: 'GET /api/admin/audit-logs endpoint'",
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"✅ GOOD: 'Authenticated API for retrieving audit data'",
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"❌ BAD: 'In activity-classifier.util.js'",
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"✅ GOOD: 'The activity classifier'",
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"❌ BAD: 'MongoDB on port 27017'",
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"✅ GOOD: 'Database backend'"
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],
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"enforcement_patterns": [
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"File paths: src/*, public/*, scripts/*",
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"API endpoints: /api/*, /admin/*",
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"File extensions in prose: .js, .html, .css",
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"Port numbers in public docs",
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"Internal URLs with specific paths"
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],
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"exemptions": [
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"Code blocks in technical implementation guides marked confidential:true",
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"Internal architectural documentation",
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"Developer setup guides not published externally"
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],
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"related_rules": [
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"inst_072"
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]
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};
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data.instructions.push(newInstruction);
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data.last_updated = new Date().toISOString();
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fs.writeFileSync(historyPath, JSON.stringify(data, null, 2));
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console.log('✅ Added inst_084: Attack Surface Exposure Prevention');
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console.log(` Quadrant: ${newInstruction.quadrant}`);
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console.log(` Persistence: ${newInstruction.persistence}`);
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console.log(` Enforcement: Pre-commit hooks for public documents`);
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scripts/check-attack-surface.js
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scripts/check-attack-surface.js
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#!/usr/bin/env node
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/*
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* Copyright 2025 John G Stroh
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Pre-commit Attack Surface Check (inst_084)
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*
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* Scans staged files for attack surface exposures
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* Blocks commits that expose internal implementation details in public documents
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*/
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const { execSync } = require('child_process');
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const fs = require('fs');
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const path = require('path');
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const { validateFile } = require('../src/utils/attack-surface-validator.util');
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function getStagedFiles() {
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try {
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const output = execSync('git diff --cached --name-only --diff-filter=ACM', {
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encoding: 'utf8',
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stdio: ['pipe', 'pipe', 'ignore']
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});
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return output.split('\n').filter(f => f.trim());
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} catch (error) {
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return [];
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}
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}
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function checkStagedFiles() {
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const stagedFiles = getStagedFiles();
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if (stagedFiles.length === 0) {
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console.log('✅ No attack surface exposure check needed (no staged files)');
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return { success: true, exposures: [] };
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}
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// Filter for documents only
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const documentFiles = stagedFiles.filter(f =>
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f.endsWith('.md') || f.includes('/docs/')
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);
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if (documentFiles.length === 0) {
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console.log('✅ No documents in staged files');
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return { success: true, exposures: [] };
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}
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console.log(`\n🔍 Scanning ${documentFiles.length} document(s) for attack surface exposure...`);
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const allExposures = [];
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for (const file of documentFiles) {
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const filePath = path.join(process.cwd(), file);
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if (!fs.existsSync(filePath)) {
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continue; // File was deleted
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}
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const content = fs.readFileSync(filePath, 'utf8');
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const result = validateFile(file, content);
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if (!result.allowed) {
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allExposures.push({
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file,
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violations: result.violations
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});
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}
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}
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return {
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success: allExposures.length === 0,
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exposures: allExposures
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};
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}
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function printExposures(exposures) {
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console.log('\n' + '━'.repeat(80));
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console.log('❌ ATTACK SURFACE EXPOSURE DETECTED (inst_084)');
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console.log('━'.repeat(80));
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console.log('');
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console.log('The following files expose internal implementation details:');
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console.log('');
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for (const { file, violations } of exposures) {
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console.log(`\n🔴 ${file}`);
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console.log('');
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for (const violation of violations) {
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console.log(` Line ${violation.line}: ${violation.description}`);
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console.log(` Found: "${violation.match}"`);
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console.log(` 💡 ${violation.suggestion}`);
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console.log('');
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}
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}
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console.log('━'.repeat(80));
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console.log('⚠️ SECURITY RISK: Internal architecture exposed in public documents');
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console.log('━'.repeat(80));
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console.log('');
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console.log('Why this matters:');
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console.log(' • Exact file paths → easier reconnaissance for attackers');
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console.log(' • API endpoints → attack surface mapping');
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console.log(' • Port numbers → network scanning targets');
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console.log(' • Internal URLs → direct access attempts');
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console.log('');
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console.log('Fix: Use generalized component names instead of specific paths');
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console.log('');
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console.log('Examples:');
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console.log(' ❌ "Dashboard at /admin/audit-analytics.html"');
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console.log(' ✅ "Administrative Dashboard"');
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console.log(' ❌ "GET /api/admin/audit-logs endpoint"');
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console.log(' ✅ "Authenticated API for audit data"');
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console.log('');
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console.log('To bypass (NOT RECOMMENDED):');
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console.log(' git commit --no-verify');
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console.log('');
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}
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// Main execution
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const result = checkStagedFiles();
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if (!result.success) {
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printExposures(result.exposures);
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process.exit(1);
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} else {
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if (result.exposures.length === 0) {
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console.log('✅ No attack surface exposures detected');
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}
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process.exit(0);
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}
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@ -100,6 +100,9 @@ function scanFiles(files) {
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files.forEach(file => {
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if (!fs.existsSync(file)) return;
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// Skip instruction-history.json (contains prohibited term DEFINITIONS, not violations)
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if (file.includes('instruction-history.json')) return;
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// Only scan text files (markdown, HTML, text)
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const ext = path.extname(file).toLowerCase();
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if (!['.md', '.html', '.txt', '.json'].includes(ext)) return;
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255
src/utils/attack-surface-validator.util.js
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src/utils/attack-surface-validator.util.js
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/*
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* Copyright 2025 John G Stroh
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Attack Surface Validator (inst_084)
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*
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* Prevents exposure of internal implementation details in public-facing documents
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* Part of defense-in-depth security strategy
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*/
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/**
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* Attack surface exposure patterns
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* Each pattern includes regex, description, and suggested replacement
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*/
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const ATTACK_SURFACE_PATTERNS = [
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// File paths
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{
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regex: /\bsrc\/[a-zA-Z0-9_\-\/]+\.(js|ts|jsx|tsx)\b/g,
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type: 'file_path',
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description: 'Source file path exposed',
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example: 'src/utils/activity-classifier.util.js',
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suggestion: 'Use component name instead (e.g., "the activity classifier")'
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},
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{
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regex: /\bpublic\/[a-zA-Z0-9_\-\/]+\.(html|css|js)\b/g,
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type: 'file_path',
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description: 'Public file path exposed',
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example: 'public/admin/dashboard.html',
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suggestion: 'Use page name instead (e.g., "administrative dashboard")'
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},
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{
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regex: /\bscripts\/[a-zA-Z0-9_\-\/]+\.js\b/g,
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type: 'file_path',
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description: 'Script file path exposed',
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example: 'scripts/validate-file-edit.js',
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suggestion: 'Use functional description (e.g., "file edit validator")'
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},
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// API endpoints
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{
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regex: /\/api\/[a-zA-Z0-9_\-\/]+/g,
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type: 'api_endpoint',
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description: 'API endpoint path exposed',
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example: '/api/admin/audit-logs',
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suggestion: 'Use functional description (e.g., "authenticated API for audit data")'
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},
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{
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regex: /\/admin\/[a-zA-Z0-9_\-\/]+\.html/g,
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type: 'admin_path',
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description: 'Admin page path exposed',
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example: '/admin/dashboard.html',
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suggestion: 'Use page name (e.g., "admin dashboard")'
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},
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// Port numbers in prose (not in code blocks)
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{
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regex: /\bport\s+\d{4,5}\b/gi,
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type: 'port_number',
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description: 'Port number exposed in text',
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example: 'port 27017',
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suggestion: 'Avoid mentioning specific ports in public docs'
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},
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{
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regex: /\bon\s+port\s+\d{4,5}\b/gi,
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type: 'port_number',
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description: 'Port number exposed with "on port"',
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example: 'on port 9000',
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suggestion: 'Remove port number from public docs'
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},
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// Database specifics
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{
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regex: /mongodb:\/\/[^\s]+/g,
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type: 'connection_string',
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description: 'MongoDB connection string pattern',
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example: 'mongodb://localhost:27017',
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suggestion: 'Use "database connection" instead'
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},
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// File extensions in prose (likely indicating file names)
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{
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regex: /\b[a-zA-Z0-9_\-]+\.(util|service|controller|model|middleware)\.js\b/g,
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type: 'file_pattern',
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description: 'Node.js file naming pattern exposed',
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example: 'activity-classifier.util.js',
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suggestion: 'Use component description without file name'
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}
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];
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/**
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* Patterns that are exempt from attack surface checking
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*/
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const EXEMPTION_PATTERNS = [
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/```[\s\S]*?```/g, // Code blocks
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/`[^`]+`/g, // Inline code
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/<!--[\s\S]*?-->/g // HTML comments
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];
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/**
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* Check if file is a public-facing document
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* @param {string} filePath - Path to file
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* @returns {boolean} - True if public-facing
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*/
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function isPublicDocument(filePath) {
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// Check if in docs/ directory
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if (filePath.includes('/docs/')) {
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return true;
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}
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// Check if markdown file
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if (filePath.endsWith('.md')) {
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return true;
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}
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// Check frontmatter for confidential flag
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// (Will be checked separately in main function)
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return false;
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}
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/**
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* Extract frontmatter from markdown content
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* @param {string} content - File content
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* @returns {Object|null} - Frontmatter metadata or null
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*/
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function extractFrontmatter(content) {
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const frontmatterRegex = /^---\s*\n([\s\S]*?)\n---/;
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const match = content.match(frontmatterRegex);
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if (!match) {
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return null;
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}
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const frontmatter = {};
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const lines = match[1].split('\n');
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for (const line of lines) {
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const colonIndex = line.indexOf(':');
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if (colonIndex === -1) continue;
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const key = line.slice(0, colonIndex).trim();
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const value = line.slice(colonIndex + 1).trim();
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frontmatter[key] = value;
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}
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return frontmatter;
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}
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/**
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* Remove exempted sections from content
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* @param {string} content - File content
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* @returns {Object} - {scannableContent, exemptedSections}
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*/
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function removeExemptedSections(content) {
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let scannableContent = content;
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const exemptedSections = [];
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for (const pattern of EXEMPTION_PATTERNS) {
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const matches = content.match(pattern) || [];
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exemptedSections.push(...matches);
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scannableContent = scannableContent.replace(pattern, '');
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}
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return { scannableContent, exemptedSections };
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}
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/**
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* Scan content for attack surface exposures
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* @param {string} content - Content to scan
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* @param {string} filePath - Path to file being scanned
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* @returns {Array} - Array of exposure findings
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*/
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function scanForExposures(content, filePath) {
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const findings = [];
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// Check if this is a public document
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if (!isPublicDocument(filePath)) {
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return findings; // Skip non-public documents
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}
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// Check frontmatter for confidential flag
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const frontmatter = extractFrontmatter(content);
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if (frontmatter && frontmatter.confidential === 'true') {
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return findings; // Skip confidential documents
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}
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// Remove code blocks and other exempted sections
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const { scannableContent } = removeExemptedSections(content);
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// Scan for each pattern
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for (const pattern of ATTACK_SURFACE_PATTERNS) {
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const matches = scannableContent.matchAll(pattern.regex);
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for (const match of matches) {
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// Get line number
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const beforeMatch = scannableContent.slice(0, match.index);
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const lineNumber = (beforeMatch.match(/\n/g) || []).length + 1;
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findings.push({
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type: pattern.type,
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description: pattern.description,
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match: match[0],
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lineNumber,
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suggestion: pattern.suggestion,
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example: pattern.example
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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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/**
|
||||
* Validate file for attack surface exposures
|
||||
* @param {string} filePath - Path to file
|
||||
* @param {string} content - File content
|
||||
* @returns {Object} - {allowed: boolean, violations: Array}
|
||||
*/
|
||||
function validateFile(filePath, content) {
|
||||
const exposures = scanForExposures(content, filePath);
|
||||
|
||||
return {
|
||||
allowed: exposures.length === 0,
|
||||
violations: exposures.map(exp => ({
|
||||
ruleId: 'inst_084',
|
||||
severity: 'MEDIUM',
|
||||
type: exp.type,
|
||||
description: exp.description,
|
||||
line: exp.lineNumber,
|
||||
match: exp.match,
|
||||
suggestion: exp.suggestion
|
||||
}))
|
||||
};
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
scanForExposures,
|
||||
validateFile,
|
||||
isPublicDocument,
|
||||
ATTACK_SURFACE_PATTERNS
|
||||
};
|
||||
Loading…
Add table
Reference in a new issue