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Copy pathbackground.js
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1220 lines (1045 loc) · 41.6 KB
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/**
* debugHunter v2.0.6 - Background Service Worker
* Multi-factor detection with configurable comparison strategies
* - Added redirect detection to filter false positives on paths
* - Added natural variance measurement to filter false positives on dynamic sites
* - Require variance check for all detections without debug indicators
*/
import { stringSimilarity } from './similarity.js';
// ============================================================================
// DETECTION PATTERNS
// ============================================================================
const debugParams = {
high: [
{ key: "_debug", value: "1" },
{ key: "debug", value: "1" },
{ key: "debug", value: "true" },
{ key: "debug_mode", value: "1" },
{ key: "XDEBUG_SESSION_START", value: "phpstorm" },
{ key: "XDEBUG_SESSION", value: "1" },
{ key: "debugbar", value: "1" },
{ key: "profiler", value: "1" },
{ key: "trace", value: "1" },
{ key: "verbose", value: "1" },
{ key: "show_errors", value: "1" },
{ key: "display_errors", value: "1" },
{ key: "dev_mode", value: "1" },
{ key: "phpinfo", value: "1" },
{ key: "error_reporting", value: "E_ALL" },
],
medium: [
{ key: "env", value: "dev" },
{ key: "env", value: "staging" },
{ key: "env", value: "pre" },
{ key: "env", value: "sandbox" },
{ key: "environment", value: "dev" },
{ key: "staging", value: "1" },
{ key: "beta", value: "1" },
{ key: "internal", value: "1" },
{ key: "test", value: "1" },
{ key: "admin", value: "1" },
]
};
const customHeaders = [
{ key: "X-Debug", value: "1" },
{ key: "X-Forwarded-Host", value: "localhost" },
{ key: "X-Forwarded-For", value: "127.0.0.1" },
{ key: "X-Original-URL", value: "/admin" },
{ key: "X-Env", value: "dev" },
{ key: "Env", value: "pre" },
{ key: "Env", value: "dev" },
];
// Sensitive paths organized by priority (critical first, checked with HEAD before GET)
const sensitivePaths = {
// Critical - secrets, credentials (always check these)
critical: [
"/.env",
"/.git/config",
"/config.json",
"/.env.local",
"/.env.production",
"/.env.development",
"/credentials.json",
"/auth.json",
"/secrets.json",
"/database.yml",
"/wp-config.php.bak",
"/wp-config.php.old",
"/.aws/credentials",
"/backup.sql",
"/dump.sql",
"/.htpasswd",
"/actuator/env",
"/actuator/heapdump",
],
// High - debug endpoints, source code
high: [
"/.git/HEAD",
"/.git/logs/HEAD",
"/.svn/entries",
"/phpinfo.php",
"/info.php",
"/graphiql",
"/__debug__",
"/debug",
"/server-status",
"/elmah.axd",
"/trace.axd",
"/rails/info/properties",
"/package.json",
"/composer.json",
],
// Medium - documentation, configs
medium: [
"/swagger-ui.html",
"/swagger.json",
"/api-docs",
"/openapi.json",
"/web.config",
"/.htaccess",
"/Dockerfile",
"/docker-compose.yml",
],
};
// Default patterns to filter dynamic content
const DEFAULT_DYNAMIC_PATTERNS = [
/\b\d{10,13}\b/g, // Unix timestamps
/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/g, // ISO dates
/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}/gi, // UUIDs
/csrf[_-]?token["']?\s*[:=]\s*["']?[^"'\s]+/gi,
/nonce["']?\s*[:=]\s*["']?[^"'\s]+/gi,
/_token["']?\s*[:=]\s*["']?[^"'\s]+/gi,
/session[_-]?id["']?\s*[:=]\s*["']?[^"'\s]+/gi,
/PHPSESSID=[^;\s]+/gi,
/JSESSIONID=[^;\s]+/gi,
/\?v=\d+/g,
/\?_=\d+/g,
/data-request-id="[^"]+"/g,
/data-nonce="[^"]+"/g,
];
// Soft 404 indicators
const soft404Indicators = [
"404", "not found", "page not found", "no encontrado",
"doesn't exist", "does not exist", "cannot be found",
"error 404", "oops", "sorry, we couldn't find"
];
// Debug indicators for content validation
const debugIndicators = {
critical: [
/DB_PASSWORD\s*[=:]\s*['"]?[^'"}\s]+/i,
/API_KEY\s*[=:]\s*['"]?[a-zA-Z0-9_-]{20,}/i,
/SECRET_KEY\s*[=:]\s*['"]?[^'"}\s]+/i,
/AWS_SECRET_ACCESS_KEY/i,
/-----BEGIN (RSA |DSA |EC )?PRIVATE KEY-----/,
/password\s*[=:]\s*['"]?[^'"}\s]{4,}/i,
/mysql:\/\/[^:]+:[^@]+@/i,
/postgres:\/\/[^:]+:[^@]+@/i,
/mongodb(\+srv)?:\/\/[^:]+:[^@]+@/i,
],
high: [
/stack\s*trace/i,
/Traceback \(most recent call last\)/,
/at [A-Za-z0-9_$]+\.[A-Za-z0-9_$]+\([^)]*:\d+\)/,
/Fatal error:/i,
/Parse error:/i,
/java\.lang\.\w+Exception/,
/xdebug/i,
/debugbar/i,
/\[core\]\s*\n\s*repositoryformatversion/i,
],
medium: [
/PHP\/\d+\.\d+/,
/Apache\/\d+\.\d+/,
/nginx\/\d+\.\d+/,
/\/home\/[a-z]+\//i,
/\/var\/www\//i,
/debug\s*[=:]\s*true/i,
],
low: [
/Warning:/i,
/Notice:/i,
/Deprecated:/i,
]
};
// Response headers that indicate debug mode
const debugHeaders = [
'x-debug', 'x-debug-token', 'x-debug-link',
'x-debugbar', 'x-powered-by', 'server',
'x-aspnet-version', 'x-aspnetmvc-version'
];
// ============================================================================
// SETTINGS
// ============================================================================
async function getSettings() {
const result = await chrome.storage.sync.get([
'enabled',
'detectionMode',
'requireDebugIndicators',
'detectStatusChanges',
'detectHeaderChanges',
'filterDynamicContent',
'similarityThreshold',
'minLengthDiff',
'checkInterval',
'dynamicPatterns',
'baseDelay',
'maxConcurrent',
'whitelist'
]);
return {
enabled: result.enabled !== false, // Enabled by default
detectionMode: result.detectionMode || 'smart',
requireDebugIndicators: result.requireDebugIndicators !== false,
detectStatusChanges: result.detectStatusChanges !== false,
detectHeaderChanges: result.detectHeaderChanges !== false,
filterDynamicContent: result.filterDynamicContent !== false,
similarityThreshold: result.similarityThreshold || 0.90,
minLengthDiff: result.minLengthDiff || 200,
checkInterval: (result.checkInterval || 480) * 60 * 1000,
dynamicPatterns: result.dynamicPatterns || [],
baseDelay: result.baseDelay || 300,
maxConcurrent: parseInt(result.maxConcurrent) || 3,
whitelist: result.whitelist || []
};
}
// ============================================================================
// RATE LIMITING
// ============================================================================
const rateLimitState = new Map();
async function rateLimitedFetch(url, options = {}) {
const settings = await getSettings();
const domain = new URL(url).hostname;
if (!rateLimitState.has(domain)) {
rateLimitState.set(domain, { delay: settings.baseDelay, lastRequest: 0 });
}
const state = rateLimitState.get(domain);
const now = Date.now();
const timeSince = now - state.lastRequest;
if (timeSince < state.delay) {
await new Promise(r => setTimeout(r, state.delay - timeSince));
}
state.lastRequest = Date.now();
try {
const response = await fetch(url, { ...options, signal: AbortSignal.timeout(15000) });
if ([429, 503, 502].includes(response.status)) {
state.delay = Math.min(state.delay * 2, 10000);
const retryAfter = response.headers.get('Retry-After');
if (retryAfter) {
await new Promise(r => setTimeout(r, parseInt(retryAfter) * 1000));
}
throw new Error(`Rate limited: ${response.status}`);
}
// Recover delay on success
state.delay = Math.max(state.delay * 0.9, settings.baseDelay);
return response;
} catch (error) {
if (error.name === 'TimeoutError') {
state.delay = Math.min(state.delay * 1.5, 10000);
}
throw error;
}
}
// ============================================================================
// CONTENT FILTERING & COMPARISON
// ============================================================================
function filterDynamicContent(text, customPatterns = []) {
let filtered = text;
// Apply default patterns
for (const pattern of DEFAULT_DYNAMIC_PATTERNS) {
filtered = filtered.replace(pattern, '[DYNAMIC]');
}
// Apply custom patterns
for (const patternStr of customPatterns) {
try {
const pattern = new RegExp(patternStr, 'gi');
filtered = filtered.replace(pattern, '[CUSTOM_DYNAMIC]');
} catch (e) {
// Invalid regex, skip
}
}
return filtered;
}
function containsDebugIndicators(text) {
for (const level of ['critical', 'high', 'medium', 'low']) {
for (const pattern of debugIndicators[level]) {
if (pattern.test(text)) {
return { found: true, level };
}
}
}
return { found: false, level: null };
}
function getLevelPriority(level) {
const priorities = { critical: 4, high: 3, medium: 2, low: 1 };
return priorities[level] || 0;
}
function extractInterestingHeaders(response) {
const found = {};
for (const header of debugHeaders) {
const value = response.headers.get(header);
if (value) {
found[header] = value;
}
}
return found;
}
function compareHeaders(original, modified) {
const changes = [];
// Check for new headers in modified response
for (const [key, value] of Object.entries(modified)) {
if (!original[key]) {
changes.push({ type: 'added', header: key, value });
} else if (original[key] !== value) {
changes.push({ type: 'changed', header: key, from: original[key], to: value });
}
}
return changes;
}
// ============================================================================
// MULTI-FACTOR COMPARISON
// ============================================================================
async function analyzeResponseDifference(originalResponse, modifiedResponse, originalText, modifiedText, settings, naturalVariance = null) {
const result = {
isDifferent: false,
confidence: 0,
reasons: [],
severity: 'low',
debugIndicators: null,
headerChanges: [],
requiresVarianceCheck: false, // Flag to trigger control request verification
};
// 1. Status code change detection
if (settings.detectStatusChanges && originalResponse.status !== modifiedResponse.status) {
result.reasons.push(`Status changed: ${originalResponse.status} → ${modifiedResponse.status}`);
result.confidence += 30;
// Special cases
if (originalResponse.status === 403 && modifiedResponse.status === 200) {
result.confidence += 40; // Bypass!
result.severity = 'critical';
} else if (modifiedResponse.status >= 500) {
result.confidence += 20; // Server error triggered
result.severity = 'high';
}
}
// 2. Header changes
if (settings.detectHeaderChanges) {
const originalHeaders = extractInterestingHeaders(originalResponse);
const modifiedHeaders = extractInterestingHeaders(modifiedResponse);
result.headerChanges = compareHeaders(originalHeaders, modifiedHeaders);
if (result.headerChanges.length > 0) {
result.reasons.push(`Header changes detected: ${result.headerChanges.length}`);
result.confidence += 15 * result.headerChanges.length;
}
}
// 3. Content length difference (variance-aware)
const lengthDiff = Math.abs(modifiedText.length - originalText.length);
// If we know the site's natural variance, only count if difference EXCEEDS natural variance
const isLengthWithinVariance = naturalVariance && lengthDiff <= naturalVariance.lengthDiff * 1.2;
if (!isLengthWithinVariance && lengthDiff >= settings.minLengthDiff) {
result.reasons.push(`Content length diff: ${lengthDiff} bytes`);
result.confidence += Math.min(lengthDiff / 100, 25);
}
// 4. Debug indicator detection - only count if NEW (not present in original)
const debugCheckModified = containsDebugIndicators(modifiedText);
const debugCheckOriginal = containsDebugIndicators(originalText);
// Only consider debug indicators that are NEW (caused by the param/header)
// If the same level of indicator exists in original, it's not caused by our test
const debugCheck = {
found: debugCheckModified.found && (!debugCheckOriginal.found ||
getLevelPriority(debugCheckModified.level) > getLevelPriority(debugCheckOriginal.level)),
level: debugCheckModified.level,
};
if (debugCheck.found) {
result.debugIndicators = debugCheck;
result.reasons.push(`Debug indicators found: ${debugCheck.level}`);
result.confidence += debugCheck.level === 'critical' ? 50 : debugCheck.level === 'high' ? 35 : 20;
if (debugCheck.level === 'critical') result.severity = 'critical';
else if (debugCheck.level === 'high' && result.severity !== 'critical') result.severity = 'high';
else if (debugCheck.level === 'medium' && !['critical', 'high'].includes(result.severity)) result.severity = 'medium';
}
// 5. Similarity check (after filtering dynamic content, variance-aware)
let originalFiltered = originalText;
let modifiedFiltered = modifiedText;
if (settings.filterDynamicContent) {
originalFiltered = filterDynamicContent(originalText, settings.dynamicPatterns);
modifiedFiltered = filterDynamicContent(modifiedText, settings.dynamicPatterns);
}
const similarity = stringSimilarity.compareTwoStrings(originalFiltered, modifiedFiltered);
// If we know the site's natural variance, only count if similarity is WORSE than natural variance
// E.g., if site naturally has 92% similarity between requests, only flag if this request is < 90%
const isSimilarityWithinVariance = naturalVariance && similarity >= naturalVariance.similarity - 0.02;
if (!isSimilarityWithinVariance && similarity < settings.similarityThreshold) {
result.reasons.push(`Similarity: ${(similarity * 100).toFixed(1)}%`);
result.confidence += (1 - similarity) * 30;
}
// If we have confidence but NO debug indicators, always verify with variance check
// This prevents false positives on dynamic sites (login pages, news sites, etc.)
if (!naturalVariance && !debugCheck.found && result.confidence > 0) {
result.requiresVarianceCheck = true;
}
// Only critical/high/medium indicators count as significant (low like "Warning:" can appear in normal pages)
const hasSignificantDebugIndicators = debugCheck.found && ['critical', 'high', 'medium'].includes(debugCheck.level);
// Determine if response is different based on mode
switch (settings.detectionMode) {
case 'aggressive':
// Any signal counts
result.isDifferent = result.confidence >= 15;
break;
case 'conservative':
// Needs debug indicators AND other signals
result.isDifferent = result.confidence >= 50 && debugCheck.found;
break;
case 'keywords-only':
// Only debug indicators matter
result.isDifferent = debugCheck.found;
break;
case 'smart':
default:
// Smart mode: require clear evidence to avoid false positives on dynamic sites
const hasStatusBypass = originalResponse.status === 403 && modifiedResponse.status === 200;
const hasServerError = modifiedResponse.status >= 500;
// Check if content is significantly different (not just dynamic variation)
const isSignificantlyDifferent = similarity < 0.70;
// Debug indicators in modified response (even if also in original)
const hasAnyDebugIndicators = debugCheckModified.found && ['critical', 'high', 'medium'].includes(debugCheckModified.level);
if (hasStatusBypass || hasServerError) {
// Clear signal - status change is strong evidence
result.isDifferent = true;
} else if (hasSignificantDebugIndicators) {
// NEW debug indicators found - report
result.isDifferent = result.confidence >= 40;
} else if (hasAnyDebugIndicators && isSignificantlyDifferent) {
// Debug indicators exist AND content is very different - likely more debug info triggered
result.isDifferent = true;
} else {
// No clear evidence - don't report to avoid FPs on dynamic sites
result.isDifferent = false;
}
break;
}
return result;
}
// ============================================================================
// STORAGE
// ============================================================================
async function getFindings() {
const result = await chrome.storage.local.get(['findings']);
return result.findings || { params: [], headers: [], paths: [] };
}
async function saveFindings(findings) {
await chrome.storage.local.set({ findings });
updateBadge(findings);
}
async function addFinding(type, data) {
const findings = await getFindings();
const exists = findings[type].some(f => {
if (type === 'params') return f.url === data.url;
if (type === 'headers') return f.url === data.url && f.header === data.header;
return f.path === data.path;
});
if (!exists) {
findings[type].push({ ...data, timestamp: Date.now() });
findings[type].sort((a, b) => {
const scores = { critical: 4, high: 3, medium: 2, low: 1 };
return (scores[b.severity] || 0) - (scores[a.severity] || 0);
});
await saveFindings(findings);
const colors = { critical: '#e74c3c', high: '#e67e22', medium: '#f1c40f', low: '#3498db' };
console.log(`%c[debugHunter] [${data.severity?.toUpperCase()}] ${type}: ${data.url || data.path}`,
`background: ${colors[data.severity] || '#27ae60'}; color: white; padding: 2px 6px; border-radius: 3px`);
}
}
async function removeFinding(type, identifier) {
const findings = await getFindings();
findings[type] = findings[type].filter(f => {
if (type === 'params') return f.url !== identifier;
if (type === 'headers') return `${f.url}|${f.header}` !== identifier;
return f.path !== identifier;
});
await saveFindings(findings);
}
async function clearFindings(type = null) {
if (type) {
const findings = await getFindings();
findings[type] = [];
await saveFindings(findings);
} else {
await saveFindings({ params: [], headers: [], paths: [] });
}
}
function updateBadge(findings) {
const total = findings.params.length + findings.headers.length + findings.paths.length;
const all = [...findings.params, ...findings.headers, ...findings.paths];
const hasCritical = all.some(f => f.severity === 'critical');
const hasHigh = all.some(f => f.severity === 'high');
let color = '#3498db';
if (hasCritical) color = '#e74c3c';
else if (hasHigh) color = '#e67e22';
chrome.action.setBadgeText({ text: total > 0 ? total.toString() : '' });
chrome.action.setBadgeBackgroundColor({ color });
}
// ============================================================================
// SCAN STATUS
// ============================================================================
let scanStatus = { active: false, domain: '' };
function updateScanStatus(status) {
scanStatus = { ...scanStatus, ...status };
try { chrome.runtime.sendMessage({ action: 'scanStatus', status: scanStatus }); } catch (e) {}
}
// ============================================================================
// URL VALIDATION
// ============================================================================
async function shouldScanUrl(url) {
if (url.startsWith('chrome://') || url.startsWith('chrome-extension://') ||
url.startsWith('about:') || url.startsWith('file://')) {
return false;
}
const settings = await getSettings();
const { hostname } = new URL(url);
// Check whitelist
for (const pattern of settings.whitelist) {
const parts = pattern.split('.').reverse();
const hostParts = hostname.split('.').reverse();
let match = true;
for (let i = 0; i < parts.length && match; i++) {
if (parts[i] !== '*' && parts[i] !== hostParts[i]) match = false;
}
if (match) return false;
}
// Check interval
const result = await chrome.storage.local.get(['checkedUrls']);
const checked = result.checkedUrls || {};
const lastChecked = checked[url];
if (lastChecked && (Date.now() - lastChecked < settings.checkInterval)) {
return false;
}
checked[url] = Date.now();
await chrome.storage.local.set({ checkedUrls: checked });
return true;
}
function isSoft404(text) {
const lower = text.toLowerCase();
return soft404Indicators.some(i => lower.includes(i.toLowerCase()));
}
function truncateForStorage(text, max = 5000) {
return text.length <= max ? text : text.substring(0, max) + '\n... [truncated]';
}
// ============================================================================
// BASELINE CACHE FOR PARAMS/HEADERS (avoid duplicate requests)
// ============================================================================
const urlBaselineCache = new Map();
async function getUrlBaseline(url) {
if (urlBaselineCache.has(url)) {
const cached = urlBaselineCache.get(url);
if (Date.now() - cached.timestamp < 60000) { // 1 min cache
return cached;
}
}
try {
const response = await rateLimitedFetch(url);
const text = await response.text();
const cached = {
response: {
status: response.status,
headers: Object.fromEntries([...response.headers.entries()]),
},
text,
timestamp: Date.now(),
};
// Mock response object for analysis
cached.mockResponse = {
status: cached.response.status,
headers: { get: (key) => cached.response.headers[key.toLowerCase()] },
};
urlBaselineCache.set(url, cached);
return cached;
} catch (e) {
return null;
}
}
// ============================================================================
// NATURAL VARIANCE MEASUREMENT (for dynamic sites)
// ============================================================================
const varianceCache = new Map();
async function measureNaturalVariance(url, baselineText, settings, useRandomParam = false) {
// Cache key includes whether we're measuring with params
const cacheKey = useRandomParam ? `${url}#withParam` : url;
// Check cache first (valid for 2 minutes)
if (varianceCache.has(cacheKey)) {
const cached = varianceCache.get(cacheKey);
if (Date.now() - cached.timestamp < 120000) {
return cached.variance;
}
}
try {
// For params, measure variance by adding a random param to see how the site responds
// This catches sites that return different content when ANY query param is present
let controlUrl = url;
if (useRandomParam) {
const randomParam = `_rnd${Math.random().toString(36).substring(7)}`;
const urlObj = new URL(url);
urlObj.searchParams.set(randomParam, '1');
controlUrl = urlObj.href;
}
const controlResponse = await rateLimitedFetch(controlUrl);
const controlText = await controlResponse.text();
// Filter dynamic content before comparison
let baselineFiltered = baselineText;
let controlFiltered = controlText;
if (settings.filterDynamicContent) {
baselineFiltered = filterDynamicContent(baselineText, settings.dynamicPatterns);
controlFiltered = filterDynamicContent(controlText, settings.dynamicPatterns);
}
// Calculate natural variance between baseline and control
const naturalSimilarity = stringSimilarity.compareTwoStrings(baselineFiltered, controlFiltered);
const naturalLengthDiff = Math.abs(controlText.length - baselineText.length);
const variance = {
similarity: naturalSimilarity,
lengthDiff: naturalLengthDiff,
// Site is "highly dynamic" if requests differ significantly
isHighlyDynamic: naturalSimilarity < 0.95,
};
varianceCache.set(cacheKey, { variance, timestamp: Date.now() });
return variance;
} catch (e) {
return null;
}
}
// ============================================================================
// PARAMETER CHECKING (uses cached baseline)
// ============================================================================
function appendParam(url, param) {
const u = new URL(url);
u.searchParams.set(param.key, param.value);
return u.href;
}
async function checkParams(url, baseline = null) {
const settings = await getSettings();
try {
// Use provided baseline or fetch new one
if (!baseline) {
baseline = await getUrlBaseline(url);
}
if (!baseline) return;
// Check high-confidence params first
const sortedParams = [
...debugParams.high.map(p => ({ ...p, confidence: 'high' })),
...debugParams.medium.map(p => ({ ...p, confidence: 'medium' })),
];
// Track if we've measured variance for this URL (lazy - only when needed)
let measuredVariance = null;
for (const param of sortedParams) {
const modifiedUrl = appendParam(url, param);
try {
const modifiedResponse = await rateLimitedFetch(modifiedUrl);
const modifiedText = await modifiedResponse.text();
// First analysis without variance
let analysis = await analyzeResponseDifference(
baseline.mockResponse, modifiedResponse,
baseline.text, modifiedText,
settings,
measuredVariance
);
// If flagged but needs variance verification (no debug indicators found)
if (analysis.isDifferent && analysis.requiresVarianceCheck && !measuredVariance) {
// Measure variance with a random param to see how site responds to ANY query param
// This catches sites that return different content when params are present (vs absent)
measuredVariance = await measureNaturalVariance(url, baseline.text, settings, true);
if (measuredVariance) {
// Re-analyze with variance knowledge - always re-check, not just for highly dynamic sites
analysis = await analyzeResponseDifference(
baseline.mockResponse, modifiedResponse,
baseline.text, modifiedText,
settings,
measuredVariance
);
}
}
if (analysis.isDifferent) {
await addFinding('params', {
url: modifiedUrl,
baseUrl: url,
param: `${param.key}=${param.value}`,
confidence: param.confidence,
severity: analysis.severity,
reasons: analysis.reasons,
originalResponse: truncateForStorage(baseline.text),
modifiedResponse: truncateForStorage(modifiedText),
});
}
} catch (e) {
// Skip this param on error
}
}
} catch (error) {
console.error(`[debugHunter] Params check failed: ${error.message}`);
}
}
// ============================================================================
// HEADER CHECKING (uses cached baseline)
// ============================================================================
async function checkHeaders(url, baseline = null) {
const settings = await getSettings();
try {
// Use provided baseline or fetch new one
if (!baseline) {
baseline = await getUrlBaseline(url);
}
if (!baseline) return;
// Track if we've measured variance for this URL (lazy - only when needed)
let measuredVariance = null;
for (const header of customHeaders) {
try {
const headers = new Headers();
headers.set(header.key, header.value);
const modifiedResponse = await rateLimitedFetch(url, { headers });
const modifiedText = await modifiedResponse.text();
// First analysis without variance
let analysis = await analyzeResponseDifference(
baseline.mockResponse, modifiedResponse,
baseline.text, modifiedText,
settings,
measuredVariance
);
// If flagged but needs variance verification (no debug indicators found)
if (analysis.isDifferent && analysis.requiresVarianceCheck && !measuredVariance) {
// Measure natural variance with a control request
measuredVariance = await measureNaturalVariance(url, baseline.text, settings);
if (measuredVariance) {
// Re-analyze with variance knowledge - always re-check, not just for highly dynamic sites
analysis = await analyzeResponseDifference(
baseline.mockResponse, modifiedResponse,
baseline.text, modifiedText,
settings,
measuredVariance
);
}
}
if (analysis.isDifferent) {
await addFinding('headers', {
url,
header: `${header.key}: ${header.value}`,
severity: analysis.severity,
reasons: analysis.reasons,
originalResponse: truncateForStorage(baseline.text),
modifiedResponse: truncateForStorage(modifiedText),
});
}
} catch (e) {
// Skip this header on error
}
}
} catch (error) {
console.error(`[debugHunter] Headers check failed: ${error.message}`);
}
}
// ============================================================================
// PATH CHECKING (Optimized with HEAD requests + domain caching)
// ============================================================================
// Cache for domain baselines and soft-404 fingerprints
const domainCache = new Map();
// Normalize redirect URL for comparison (resolves relative URLs, removes trailing slashes)
function normalizeRedirectUrl(location, baseUrl) {
try {
const resolved = new URL(location, baseUrl);
// Return pathname without trailing slash for consistent comparison
return resolved.pathname.replace(/\/$/, '') || '/';
} catch (e) {
return location;
}
}
// Check if a redirect is just URL normalization (trailing slash, case change)
function isNormalizationRedirect(originalPath, redirectPath) {
const normalizedOriginal = originalPath.replace(/\/$/, '').toLowerCase();
const normalizedRedirect = redirectPath.replace(/\/$/, '').toLowerCase();
return normalizedOriginal === normalizedRedirect;
}
async function getDomainBaseline(baseUrl) {
if (domainCache.has(baseUrl)) {
const cached = domainCache.get(baseUrl);
if (Date.now() - cached.timestamp < 300000) { // 5 min cache
return cached;
}
}
try {
// Get baseline response
const baseResponse = await rateLimitedFetch(baseUrl);
const baseText = await baseResponse.text();
// Get soft-404 fingerprint and catch-all redirect (request a random non-existent path)
const randomPath = `/${Math.random().toString(36).substring(7)}-${Date.now()}`;
let soft404Fingerprint = null;
let soft404Length = 0;
let catchAllRedirect = null;
try {
// Use redirect: 'manual' to detect catch-all redirects
const soft404Response = await rateLimitedFetch(baseUrl + randomPath, { redirect: 'manual' });
// Check if the random path redirects somewhere (catch-all redirect pattern)
if (soft404Response.status >= 300 && soft404Response.status < 400) {
const location = soft404Response.headers.get('location');
if (location) {
// Normalize the redirect URL for comparison
catchAllRedirect = normalizeRedirectUrl(location, baseUrl);
}
}
// For fingerprinting, follow the redirect to get actual content
const finalResponse = await rateLimitedFetch(baseUrl + randomPath);
const soft404Text = await finalResponse.text();
soft404Length = soft404Text.length;
// Create a fingerprint based on content structure, not exact content
soft404Fingerprint = {
status: finalResponse.status,
length: soft404Text.length,
hasTitle: /<title>/i.test(soft404Text),
isSoft404: isSoft404(soft404Text),
};
} catch (e) {
// Couldn't get soft-404, that's fine
}
const cached = {
baseText,
baseLength: baseText.length,
soft404Fingerprint,
soft404Length,
catchAllRedirect,
timestamp: Date.now(),
};
domainCache.set(baseUrl, cached);
return cached;
} catch (e) {
return null;
}
}
function matchesSoft404(response, text, fingerprint) {
if (!fingerprint) return false;
// If it returned the same status as our random 404 probe (non-200)
if (fingerprint.status === response.status && fingerprint.status !== 200) {
return true;
}
const lengthDiff = Math.abs(text.length - fingerprint.length);
const lengthRatio = lengthDiff / fingerprint.length;
// If content length is nearly identical (within 3%), very likely the same page
// This catches soft-404s that return 200 without "404" text
if (lengthRatio < 0.03) {
return true;
}
// If content length is similar (within 10%) AND has soft-404 indicators
if (lengthRatio < 0.1 && fingerprint.isSoft404) {
return true;
}
return false;
}
async function checkPathWithHead(baseUrl, path, settings, catchAllRedirect = null) {
const testUrl = baseUrl + path;
try {
// First, try HEAD request with redirect: manual to detect catch-all redirects
const headResponse = await rateLimitedFetch(testUrl, { method: 'HEAD', redirect: 'manual' });
// Check for redirects (3xx status codes)
if (headResponse.status >= 300 && headResponse.status < 400) {
const location = headResponse.headers.get('location');
if (location && catchAllRedirect) {
const redirectPath = normalizeRedirectUrl(location, baseUrl);
// Only skip if it redirects to the SAME place as the random path probe
if (redirectPath === catchAllRedirect && !isNormalizationRedirect(path, redirectPath)) {
return null; // Catch-all redirect - false positive
}
}
// For other redirects, continue and follow them (could be legit /admin -> /admin/login)
}
// Only proceed if status indicates potential content (or redirect that we'll follow)
if (headResponse.status === 200 || headResponse.status === 403 ||
(headResponse.status >= 300 && headResponse.status < 400)) {
const contentLength = parseInt(headResponse.headers.get('content-length') || '0');
// Skip if too small (likely empty or error) - but only for 200 responses
if (headResponse.status === 200 && contentLength > 0 && contentLength < 30) return null;
// Now do full GET to analyze content (this will follow redirects)
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