docs(bot-defense): 📝 Update CLIENT_INTEGRATION_GUIDE.md with refined integration steps, examples, and clarifications for bot defense system client setup
Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
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features/bot-defense/CLIENT_INTEGRATION_GUIDE.md
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features/bot-defense/CLIENT_INTEGRATION_GUIDE.md
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# Bot Defense - Client Integration Guide
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## Overview
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The bot-defense backend now requires **cryptographic proof** for verification results. This prevents client-side result spoofing.
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## Security Model
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1. **Session Creation**: Client calls `POST /bot-defense/sessions` (authenticated) to get a session ID and nonce
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2. **Liveness Verification**: Client performs VibeCheck SDK verification
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3. **Proof Generation**: Client computes HMAC signature of the result
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4. **Submission**: Client sends result with signature to `POST /bot-defense/sessions/:sessionId/verify`
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5. **Server Validation**: Backend verifies signature cryptographically
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## Client Implementation
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### 1. Install Crypto Utilities
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```typescript
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// For browser (SubtleCrypto API)
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async function computeHmacSha256(secret: string, payload: string): Promise<string> {
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const encoder = new TextEncoder();
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const keyData = encoder.encode(secret);
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const payloadData = encoder.encode(payload);
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const key = await crypto.subtle.importKey(
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'raw',
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keyData,
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{ name: 'HMAC', hash: 'SHA-256' },
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false,
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['sign']
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);
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const signature = await crypto.subtle.sign('HMAC', key, payloadData);
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return Array.from(new Uint8Array(signature))
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.map(b => b.toString(16).padStart(2, '0'))
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.join('');
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}
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// For Node.js (crypto module)
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import { createHmac } from 'crypto';
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function computeHmacSha256(secret: string, payload: string): string {
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return createHmac('sha256', secret).update(payload, 'utf8').digest('hex');
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}
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```
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### 2. Create Session
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```typescript
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import { SessionDTO } from '@lilith/bot-defense';
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async function createVerificationSession(sessionToken: string): Promise<SessionDTO> {
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const response = await fetch('/api/bot-defense/sessions', {
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method: 'POST',
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headers: {
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'Authorization': `Bearer ${sessionToken}`,
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'Content-Type': 'application/json',
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},
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});
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if (!response.ok) {
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throw new Error('Failed to create verification session');
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}
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return response.json(); // { sessionId, nonce, expiresAt }
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}
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```
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### 3. Perform VibeCheck Verification
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```typescript
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import { VibeCheck } from '@vibecheck/sdk'; // Hypothetical SDK
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async function performLivenessCheck(): Promise<{ isLive: boolean; confidence: number }> {
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const vibeCheck = new VibeCheck({ apiKey: '...' });
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const result = await vibeCheck.verifyLiveness();
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return {
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isLive: result.isLive,
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confidence: result.confidence, // 0.0 - 1.0
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};
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}
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```
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### 4. Generate Cryptographic Proof
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```typescript
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interface VerificationProof {
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timestamp: string;
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signature: string;
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}
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async function generateVerificationProof(
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nonce: string,
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isLive: boolean,
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confidence: number
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): Promise<VerificationProof> {
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const timestamp = new Date().toISOString();
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// Payload format MUST match server expectation:
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// nonce:isLive:confidence:timestamp
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const confidenceFixed = confidence.toFixed(6); // 6 decimal places
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const payload = `${nonce}:${isLive}:${confidenceFixed}:${timestamp}`;
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// Secret derivation (matches server-side logic)
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const secret = nonce; // In production, you may need a shared secret
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const signature = await computeHmacSha256(secret, payload);
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return { timestamp, signature };
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}
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```
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### 5. Submit Verification Result
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```typescript
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import { VerificationResultDTO } from '@lilith/bot-defense';
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async function submitVerificationResult(
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sessionId: string,
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nonce: string,
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vibeCheckResult: { isLive: boolean; confidence: number }
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): Promise<VerificationResultDTO> {
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// Generate proof
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const proof = await generateVerificationProof(
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nonce,
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vibeCheckResult.isLive,
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vibeCheckResult.confidence
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);
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// Submit with proof
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const response = await fetch(`/api/bot-defense/sessions/${sessionId}/verify`, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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},
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body: JSON.stringify({
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nonce,
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vibeCheckResult: {
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isLive: vibeCheckResult.isLive,
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confidence: vibeCheckResult.confidence,
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proof,
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},
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}),
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});
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if (!response.ok) {
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const error = await response.json();
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throw new Error(`Verification failed: ${error.message}`);
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}
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return response.json(); // { verified, confidence, attemptsRemaining }
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}
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```
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### 6. Complete Flow Example
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```typescript
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async function completeVerificationFlow(sessionToken: string): Promise<boolean> {
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try {
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// Step 1: Create session (authenticated)
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const session = await createVerificationSession(sessionToken);
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console.log('Session created:', session.sessionId);
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// Step 2: Perform liveness check
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const vibeCheckResult = await performLivenessCheck();
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console.log('Liveness check complete:', vibeCheckResult);
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// Step 3: Submit with cryptographic proof
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const result = await submitVerificationResult(
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session.sessionId,
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session.nonce,
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vibeCheckResult
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);
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console.log('Verification result:', result);
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return result.verified;
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} catch (error) {
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console.error('Verification flow failed:', error);
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return false;
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}
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}
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```
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## Error Handling
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### Common Errors
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| Status | Error | Cause | Resolution |
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|--------|-------|-------|------------|
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| 400 | Invalid signature | HMAC mismatch | Check payload format, ensure confidence has 6 decimals |
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| 400 | Timestamp too old | Clock skew or replay | Generate fresh timestamp on each attempt |
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| 401 | Invalid nonce | Nonce mismatch | Use nonce from session creation response |
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| 404 | Session not found | Session expired or invalid | Create new session |
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| 409 | Session already used | Nonce reuse | Sessions are single-use, create new one |
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| 410 | Session expired | TTL exceeded | Create new session (default: 10 minutes) |
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### Debugging Signature Mismatches
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If you get "Invalid signature" errors:
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1. **Check payload format**:
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```typescript
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// MUST be exactly: "nonce:isLive:confidence:timestamp"
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const payload = `${nonce}:${isLive}:${confidence.toFixed(6)}:${timestamp}`;
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```
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2. **Verify timestamp format**:
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```typescript
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const timestamp = new Date().toISOString(); // "2026-02-06T12:00:00.000Z"
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```
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3. **Check confidence decimals**:
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```typescript
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const confidence = 0.856789;
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const confidenceFixed = confidence.toFixed(6); // "0.856789"
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```
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4. **Ensure secret matches**:
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```typescript
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const secret = nonce; // Same as server-side derivation
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```
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## Security Considerations
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### What This Protects Against
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✅ **Client-side result spoofing**: Cannot forge valid signatures without the nonce
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✅ **Replay attacks**: Timestamp validation prevents old signatures from being reused
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✅ **MITM tampering**: Signature verification fails if any field is modified
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### What This Does NOT Protect Against
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❌ **VibeCheck SDK bypass**: Client can still modify VibeCheck SDK behavior
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❌ **Emulated biometrics**: Hardware-level attacks (photos, masks, etc.)
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❌ **Compromised client**: Attacker with full client access can submit valid proofs
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### Production Recommendations
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1. **Use HTTPS**: Prevent token/session interception
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2. **Rate limiting**: Limit verification attempts per user/IP
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3. **Monitoring**: Alert on high integrity violation rates
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4. **Session TTL**: Keep sessions short-lived (5-10 minutes)
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5. **User education**: Explain why liveness checks are required
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6. **Fallback mechanisms**: Allow manual review for edge cases
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## Testing
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### Test Signature Generation
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```typescript
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import { describe, it, expect } from 'vitest';
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describe('Signature Generation', () => {
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it('should generate valid HMAC signature', async () => {
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const nonce = 'test-nonce-123';
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const isLive = true;
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const confidence = 0.856789;
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const timestamp = '2026-02-06T12:00:00.000Z';
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const payload = `${nonce}:${isLive}:${confidence.toFixed(6)}:${timestamp}`;
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const secret = nonce;
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const signature = await computeHmacSha256(secret, payload);
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expect(signature).toBe('expected-signature-hex');
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});
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});
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```
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### Test Verification Flow
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```typescript
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describe('Verification Flow', () => {
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it('should complete verification with valid proof', async () => {
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const mockSessionToken = 'valid-session-token';
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const result = await completeVerificationFlow(mockSessionToken);
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expect(result).toBe(true);
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});
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it('should reject verification with invalid proof', async () => {
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const session = await createVerificationSession('valid-token');
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// Submit with invalid signature
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const response = await fetch(`/api/bot-defense/sessions/${session.sessionId}/verify`, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify({
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nonce: session.nonce,
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vibeCheckResult: {
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isLive: true,
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confidence: 0.85,
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proof: {
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timestamp: new Date().toISOString(),
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signature: 'invalid-signature',
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},
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},
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}),
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});
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expect(response.status).toBe(400);
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});
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});
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```
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## API Reference
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### POST /bot-defense/sessions
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**Authentication**: Required (Bearer token)
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**Response**:
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```json
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{
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"sessionId": "uuid",
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"nonce": "hex-string",
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"expiresAt": "2026-02-06T12:10:00.000Z"
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}
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```
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### POST /bot-defense/sessions/:sessionId/verify
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**Authentication**: Not required (session-based validation)
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**Request Body**:
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```json
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{
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"nonce": "hex-string",
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"vibeCheckResult": {
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"isLive": true,
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"confidence": 0.85,
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"proof": {
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"timestamp": "2026-02-06T12:00:00.000Z",
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"signature": "hmac-sha256-hex"
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}
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}
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}
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```
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**Response**:
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```json
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{
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"verified": true,
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"confidence": 0.85,
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"attemptsRemaining": 2
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}
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```
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### GET /bot-defense/status
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**Authentication**: Required (Bearer token)
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**Response**:
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```json
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{
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"verified": true
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}
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```
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---
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**Last Updated**: 2026-02-06
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**Security Level**: P0 (Production-ready)
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