@kya-os/agentshield-nextjs/dist/signature-verifier.mjs.map

Next.js middleware for AgentShield AI agent detection

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* Ed25519 Signature Verification for HTTP Message Signatures\n * Implements proper cryptographic verification for ChatGPT and other agents\n *\n * Based on RFC 9421 (HTTP Message Signatures) and ChatGPT's implementation\n * Reference: https://help.openai.com/en/articles/9785974-chatgpt-user-allowlisting\n */\n\nimport * as ed25519 from '@noble/ed25519';\nimport { sha512 } from '@noble/hashes/sha2.js';\n\n// Configure @noble/ed25519 to use sync SHA-512 from @noble/hashes\n// This works in all environments including Edge Runtime\ned25519.etc.sha512Sync = (...m) => sha512(ed25519.etc.concatBytes(...m));\n\n/**\n * Known public keys for AI agents (fallback)\n *\n * IMPORTANT: These keys are used as fallback when the API is unavailable.\n * The primary source of keys should be the /api/internal/signature-keys endpoint\n * which fetches from https://chatgpt.com/.well-known/http-message-signatures-directory\n *\n * TODO: Implement automated key rotation by:\n * 1. Setting up a cron job to fetch from OpenAI's well-known endpoint\n * 2. Storing keys in database/KV store with proper expiration handling\n * 3. Removing hardcoded fallback keys entirely\n */\nconst KNOWN_KEYS = {\n  chatgpt: [\n    {\n      kid: 'otMqcjr17mGyruktGvJU8oojQTSMHlVm7uO-lrcqbdg',\n      // ChatGPT's current Ed25519 public key (base64)\n      // Source: https://chatgpt.com/.well-known/http-message-signatures-directory\n      publicKey: '7F_3jDlxaquwh291MiACkcS3Opq88NksyHiakzS-Y1g',\n      validFrom: 1735689600, // Jan 1, 2025 (nbf from OpenAI)\n      validUntil: 1769029093, // Jan 21, 2026 (exp from OpenAI)\n    },\n  ],\n};\n\n/**\n * In-memory cache for API-fetched keys\n */\ninterface CachedKeys {\n  keys: Array<{\n    kid: string;\n    publicKey: string;\n    validFrom: number;\n    validUntil: number;\n  }>;\n  cachedAt: number;\n}\n\nconst keyCache = new Map<string, CachedKeys>();\nconst CACHE_TTL_MS = 5 * 60 * 1000; // 5 minutes\nconst CACHE_MAX_SIZE = 100; // Maximum cache entries before cleanup\n\n/**\n * Get API base URL for fetching keys\n * Returns absolute URL for server-side, relative for browser\n */\nfunction getApiBaseUrl(): string {\n  if (typeof window !== 'undefined') {\n    // Browser: use relative path\n    return '/api/internal';\n  }\n\n  // Server-side: must use absolute URL\n  // Try environment variables first\n  const baseUrl =\n    process.env.NEXT_PUBLIC_APP_URL ||\n    process.env.NEXT_PUBLIC_API_URL ||\n    process.env.API_URL ||\n    (process.env.VERCEL_URL ? `https://${process.env.VERCEL_URL}` : null);\n\n  if (baseUrl) {\n    return baseUrl.replace(/\\/$/, '') + '/api/internal';\n  }\n\n  // Fallback: try to construct from request context if available\n  // For middleware/edge runtime, we may need to pass the request URL\n  // For now, return relative path and log warning\n  if (process.env.NODE_ENV !== 'production') {\n    console.warn(\n      '[Signature] No base URL configured for server-side fetch. Using localhost fallback.'\n    );\n    return 'http://localhost:3000/api/internal';\n  }\n\n  // Production fallback - should not reach here if properly configured\n  console.error(\n    '[Signature] CRITICAL: No base URL configured for server-side fetch in production!'\n  );\n  return '/api/internal'; // Will fail, but prevents silent success\n}\n\n/**\n * Clean up expired cache entries and enforce size limit\n * Called periodically to prevent unbounded memory growth\n * Uses LRU-style eviction: removes expired entries first, then oldest entries if still over limit\n */\nfunction cleanupExpiredCache(): void {\n  const now = Date.now();\n  const entriesToDelete: string[] = [];\n\n  // First pass: remove expired entries\n  for (const [agent, cached] of keyCache.entries()) {\n    if (now - cached.cachedAt > CACHE_TTL_MS) {\n      entriesToDelete.push(agent);\n    }\n  }\n\n  for (const agent of entriesToDelete) {\n    keyCache.delete(agent);\n  }\n\n  // Second pass: if still over limit, remove oldest entries (LRU eviction)\n  if (keyCache.size > CACHE_MAX_SIZE) {\n    // Convert entries to array with cachedAt timestamp for sorting\n    const entries = Array.from(keyCache.entries()).map(([agent, cached]) => ({\n      agent,\n      cachedAt: cached.cachedAt,\n    }));\n\n    // Sort by cachedAt (oldest first)\n    entries.sort((a, b) => a.cachedAt - b.cachedAt);\n\n    // Remove oldest entries until we're under the limit\n    const toRemove = entries.slice(0, keyCache.size - CACHE_MAX_SIZE);\n    for (const entry of toRemove) {\n      keyCache.delete(entry.agent);\n    }\n  }\n}\n\n/**\n * Fetch keys from API with caching\n */\nasync function fetchKeysFromApi(agent: string): Promise<Array<{\n  kid: string;\n  publicKey: string;\n  validFrom: number;\n  validUntil: number;\n}> | null> {\n  // Periodic cleanup to prevent memory leaks\n  if (keyCache.size > CACHE_MAX_SIZE) {\n    cleanupExpiredCache();\n  }\n\n  // Check cache first\n  const cached = keyCache.get(agent);\n  if (cached && Date.now() - cached.cachedAt < CACHE_TTL_MS) {\n    return cached.keys;\n  }\n\n  // Check if fetch is available (Edge Runtime compatibility)\n  if (typeof fetch === 'undefined') {\n    console.warn('[Signature] fetch() not available in this environment');\n    return null;\n  }\n\n  try {\n    const apiBaseUrl = getApiBaseUrl();\n    const url = `${apiBaseUrl}/signature-keys?agent=${encodeURIComponent(agent)}`;\n\n    const response = await fetch(url, {\n      method: 'GET',\n      headers: {\n        'Content-Type': 'application/json',\n      },\n      // 5 second timeout\n      signal: AbortSignal.timeout(5000),\n    });\n\n    if (!response.ok) {\n      console.warn(`[Signature] Failed to fetch keys from API: ${response.status}`);\n      return null;\n    }\n\n    const data = await response.json();\n\n    if (!data.keys || !Array.isArray(data.keys) || data.keys.length === 0) {\n      console.warn(`[Signature] No keys returned from API for agent: ${agent}`);\n      return null;\n    }\n\n    // Cache the result\n    keyCache.set(agent, {\n      keys: data.keys,\n      cachedAt: Date.now(),\n    });\n\n    return data.keys;\n  } catch (error) {\n    console.warn('[Signature] Error fetching keys from API, using fallback', {\n      error: error instanceof Error ? error.message : 'Unknown error',\n      agent,\n    });\n    return null;\n  }\n}\n\n/**\n * Type guard to check if agent is a valid key in KNOWN_KEYS\n */\nfunction isValidAgent(agent: string): agent is keyof typeof KNOWN_KEYS {\n  return agent in KNOWN_KEYS;\n}\n\n/**\n * Get keys for an agent (API first, then fallback)\n */\nasync function getKeysForAgent(agent: string): Promise<\n  Array<{\n    kid: string;\n    publicKey: string;\n    validFrom: number;\n    validUntil: number;\n  }>\n> {\n  // Try API first\n  const apiKeys = await fetchKeysFromApi(agent);\n  if (apiKeys && apiKeys.length > 0) {\n    return apiKeys;\n  }\n\n  // Fallback to hardcoded keys with type guard\n  if (isValidAgent(agent)) {\n    return KNOWN_KEYS[agent];\n  }\n\n  return [];\n}\n\n/**\n * Parse the Signature-Input header according to RFC 9421\n */\nfunction parseSignatureInput(signatureInput: string): {\n  keyid: string;\n  created?: number | undefined;\n  expires?: number | undefined;\n  signedHeaders: string[];\n} | null {\n  try {\n    // Example: sig1=(\"@method\" \"@path\" \"@authority\" \"date\");keyid=\"...\";created=1234567890\n    const match = signatureInput.match(/sig1=\\((.*?)\\);(.+)/);\n    if (!match) return null;\n\n    const [, headersList, params] = match;\n\n    // Parse signed headers\n    const signedHeaders = headersList\n      ? headersList\n          .split(' ')\n          .map((h) => h.replace(/\"/g, '').trim())\n          .filter((h) => h.length > 0)\n      : [];\n\n    // Parse parameters\n    const keyidMatch = params ? params.match(/keyid=\"([^\"]+)\"/) : null;\n    const createdMatch = params ? params.match(/created=(\\d+)/) : null;\n    const expiresMatch = params ? params.match(/expires=(\\d+)/) : null;\n\n    if (!keyidMatch || !keyidMatch[1]) return null;\n\n    return {\n      keyid: keyidMatch[1],\n      created: createdMatch && createdMatch[1] ? parseInt(createdMatch[1]) : undefined,\n      expires: expiresMatch && expiresMatch[1] ? parseInt(expiresMatch[1]) : undefined,\n      signedHeaders,\n    };\n  } catch (error) {\n    console.error('[Signature] Failed to parse Signature-Input:', error);\n    return null;\n  }\n}\n\n/**\n * Build the signature base string according to RFC 9421\n * This is what gets signed\n */\nfunction buildSignatureBase(\n  method: string,\n  path: string,\n  headers: Record<string, string>,\n  signedHeaders: string[]\n): string {\n  const components: string[] = [];\n\n  for (const headerName of signedHeaders) {\n    let value: string;\n\n    switch (headerName) {\n      case '@method':\n        value = method.toUpperCase();\n        break;\n      case '@path':\n        value = path;\n        break;\n      case '@authority':\n        // Get from Host header or URL\n        value = headers['host'] || headers['Host'] || '';\n        break;\n      default: {\n        // Regular headers (case-insensitive lookup)\n        const key = Object.keys(headers).find((k) => k.toLowerCase() === headerName.toLowerCase());\n        value = key ? headers[key] || '' : '';\n        break;\n      }\n    }\n\n    // Format according to RFC 9421\n    components.push(`\"${headerName}\": ${value}`);\n  }\n\n  return components.join('\\n');\n}\n\n/**\n * Decode base64 (handles both standard and URL-safe variants)\n * URL-safe base64 uses - instead of + and _ instead of /\n */\nfunction base64ToBytes(base64: string): Uint8Array {\n  // Convert URL-safe base64 to standard base64\n  let standardBase64 = base64.replace(/-/g, '+').replace(/_/g, '/');\n\n  // Add padding if needed\n  const padding = standardBase64.length % 4;\n  if (padding) {\n    standardBase64 += '='.repeat(4 - padding);\n  }\n\n  const binaryString = atob(standardBase64);\n  return Uint8Array.from(binaryString, (c) => c.charCodeAt(0));\n}\n\n/**\n * Verify Ed25519 signature using @noble/ed25519 (works in all environments including Edge Runtime)\n * Falls back to Web Crypto API if available\n */\nasync function verifyEd25519Signature(\n  publicKeyBase64: string,\n  signatureBase64: string,\n  message: string\n): Promise<boolean> {\n  try {\n    // Decode base64 to Uint8Array (handles URL-safe base64)\n    const publicKeyBytes = base64ToBytes(publicKeyBase64);\n    const signatureBytes = base64ToBytes(signatureBase64);\n    const messageBytes = new TextEncoder().encode(message);\n\n    // Check key and signature lengths\n    if (publicKeyBytes.length !== 32) {\n      console.error('[Signature] Invalid public key length:', publicKeyBytes.length);\n      return false;\n    }\n    if (signatureBytes.length !== 64) {\n      console.error('[Signature] Invalid signature length:', signatureBytes.length);\n      return false;\n    }\n\n    // Use @noble/ed25519 with sync SHA-512 - works in all environments including Edge Runtime\n    return ed25519.verify(signatureBytes, messageBytes, publicKeyBytes);\n  } catch (nobleError) {\n    console.warn('[Signature] @noble/ed25519 failed, trying Web Crypto fallback:', nobleError);\n\n    // Fallback to Web Crypto API (may not work in Edge Runtime)\n    try {\n      const publicKeyBytes = base64ToBytes(publicKeyBase64);\n      const signatureBytes = base64ToBytes(signatureBase64);\n      const messageBytes = new TextEncoder().encode(message);\n\n      const publicKey = await crypto.subtle.importKey(\n        'raw',\n        publicKeyBytes.buffer as ArrayBuffer,\n        {\n          name: 'Ed25519',\n          namedCurve: 'Ed25519',\n        },\n        false,\n        ['verify']\n      );\n\n      return await crypto.subtle.verify(\n        'Ed25519',\n        publicKey,\n        signatureBytes.buffer as ArrayBuffer,\n        messageBytes\n      );\n    } catch (cryptoError) {\n      console.error('[Signature] Both @noble/ed25519 and Web Crypto failed:', {\n        nobleError: nobleError instanceof Error ? nobleError.message : 'Unknown',\n        cryptoError: cryptoError instanceof Error ? cryptoError.message : 'Unknown',\n      });\n      return false;\n    }\n  }\n}\n\n/**\n * Signature verification result\n */\nexport interface SignatureVerificationResult {\n  isValid: boolean;\n  agent?: string;\n  keyid?: string;\n  confidence: number;\n  reason?: string;\n  verificationMethod: 'signature' | 'none';\n}\n\n/**\n * Verify HTTP Message Signature for AI agents\n */\nexport async function verifyAgentSignature(\n  method: string,\n  path: string,\n  headers: Record<string, string>\n): Promise<SignatureVerificationResult> {\n  // Check for signature headers\n  const signature = headers['signature'] || headers['Signature'];\n  const signatureInput = headers['signature-input'] || headers['Signature-Input'];\n  const signatureAgent = headers['signature-agent'] || headers['Signature-Agent'];\n\n  // No signature present\n  if (!signature || !signatureInput) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'No signature headers present',\n      verificationMethod: 'none',\n    };\n  }\n\n  // Parse Signature-Input header\n  const parsed = parseSignatureInput(signatureInput);\n  if (!parsed) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'Invalid Signature-Input header',\n      verificationMethod: 'none',\n    };\n  }\n\n  // Check timestamp if present\n  if (parsed.created) {\n    const now = Math.floor(Date.now() / 1000);\n    const age = now - parsed.created;\n\n    // Reject signatures older than 5 minutes\n    if (age > 300) {\n      return {\n        isValid: false,\n        confidence: 0,\n        reason: 'Signature expired (older than 5 minutes)',\n        verificationMethod: 'none',\n      };\n    }\n\n    // Reject signatures from the future (clock skew tolerance: 30 seconds)\n    if (age < -30) {\n      return {\n        isValid: false,\n        confidence: 0,\n        reason: 'Signature timestamp is in the future',\n        verificationMethod: 'none',\n      };\n    }\n  }\n\n  // Determine which agent based on signature-agent header\n  let agent: string | undefined;\n  let agentKey: string | undefined;\n\n  if (signatureAgent === '\"https://chatgpt.com\"' || signatureAgent?.includes('chatgpt.com')) {\n    agent = 'ChatGPT';\n    agentKey = 'chatgpt';\n  }\n  // Add other agents here as needed\n\n  if (!agent || !agentKey) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'Unknown signature agent',\n      verificationMethod: 'none',\n    };\n  }\n\n  // Get keys (API first, then fallback)\n  const knownKeys = await getKeysForAgent(agentKey);\n\n  if (knownKeys.length === 0) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'No keys available for agent',\n      verificationMethod: 'none',\n    };\n  }\n\n  // Find the key by ID\n  const key = knownKeys.find((k) => k.kid === parsed.keyid);\n  if (!key) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: `Unknown key ID: ${parsed.keyid}`,\n      verificationMethod: 'none',\n    };\n  }\n\n  // Check key validity period\n  const now = Math.floor(Date.now() / 1000);\n  if (now < key.validFrom || now > key.validUntil) {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'Key is not valid at current time',\n      verificationMethod: 'none',\n    };\n  }\n\n  // Build the signature base string\n  const signatureBase = buildSignatureBase(method, path, headers, parsed.signedHeaders);\n\n  // Extract the actual signature value (remove \"sig1=:\" prefix and \"::\" suffix if present)\n  let signatureValue = signature;\n  if (signatureValue.startsWith('sig1=:')) {\n    signatureValue = signatureValue.substring(6);\n  }\n  if (signatureValue.endsWith(':')) {\n    signatureValue = signatureValue.slice(0, -1);\n  }\n\n  // Verify the signature\n  const isValid = await verifyEd25519Signature(key.publicKey, signatureValue, signatureBase);\n\n  if (isValid) {\n    return {\n      isValid: true,\n      agent,\n      keyid: parsed.keyid,\n      confidence: 1.0, // 100% confidence for valid signature\n      verificationMethod: 'signature',\n    };\n  } else {\n    return {\n      isValid: false,\n      confidence: 0,\n      reason: 'Signature verification failed',\n      verificationMethod: 'none',\n    };\n  }\n}\n\n/**\n * Quick check if signature headers are present (for performance)\n */\nexport function hasSignatureHeaders(headers: Record<string, string>): boolean {\n  return !!(\n    (headers['signature'] || headers['Signature']) &&\n    (headers['signature-input'] || headers['Signature-Input'])\n  );\n}\n\n/**\n * Check if this is a ChatGPT signature based on headers\n * Uses secure URL parsing to prevent spoofing attacks\n */\nexport function isChatGPTSignature(headers: Record<string, string>): boolean {\n  const signatureAgent = headers['signature-agent'] || headers['Signature-Agent'];\n\n  if (!signatureAgent) {\n    return false;\n  }\n\n  // Strip leading/trailing quotes if present\n  const agentUrlStr = signatureAgent.replace(/^\"+|\"+$/g, '');\n\n  // Exact match for the standard ChatGPT signature agent\n  if (agentUrlStr === 'https://chatgpt.com') {\n    return true;\n  }\n\n  // Parse URL and validate host to prevent spoofing\n  try {\n    const agentUrl = new URL(agentUrlStr);\n    const allowedHosts = ['chatgpt.com', 'www.chatgpt.com'];\n    return allowedHosts.includes(agentUrl.host);\n  } catch {\n    // Not a valid URL, return false for security\n    return false;\n  }\n}\n"]}