/** * Certificate Utilities for SMTP Server * Provides utilities for managing TLS certificates */ import * as fs from 'fs'; import * as tls from 'tls'; import { SmtpLogger } from './utils/logging.js'; /** * Normalize a PEM certificate string * @param str - Certificate string * @returns Normalized certificate string */ function normalizeCertificate(str) { // Handle different input types let inputStr; if (Buffer.isBuffer(str)) { // Convert Buffer to string using utf8 encoding inputStr = str.toString('utf8'); } else if (typeof str === 'string') { inputStr = str; } else { throw new Error('Certificate must be a string or Buffer'); } if (!inputStr) { throw new Error('Empty certificate data'); } // Remove any whitespace around the string let normalizedStr = inputStr.trim(); // Make sure it has proper PEM format if (!normalizedStr.includes('-----BEGIN ')) { throw new Error('Invalid certificate format: Missing BEGIN marker'); } if (!normalizedStr.includes('-----END ')) { throw new Error('Invalid certificate format: Missing END marker'); } // Normalize line endings (replace Windows-style \r\n with Unix-style \n) normalizedStr = normalizedStr.replace(/\r\n/g, '\n'); // Only normalize if the certificate appears to have formatting issues // Check if the certificate is already properly formatted const lines = normalizedStr.split('\n'); let needsReformatting = false; // Check for common formatting issues: // 1. Missing line breaks after header/before footer // 2. Lines that are too long or too short (except header/footer) // 3. Multiple consecutive blank lines for (let i = 0; i < lines.length; i++) { const line = lines[i].trim(); if (line.startsWith('-----BEGIN ') || line.startsWith('-----END ')) { continue; // Skip header/footer lines } if (line.length === 0) { continue; // Skip empty lines } // Check if content lines are reasonable length (base64 is typically 64 chars per line) if (line.length > 76) { // Allow some flexibility beyond standard 64 needsReformatting = true; break; } } // Only reformat if necessary if (needsReformatting) { const beginMatch = normalizedStr.match(/^(-----BEGIN [^-]+-----)(.*)$/s); const endMatch = normalizedStr.match(/(.*)(-----END [^-]+-----)$/s); if (beginMatch && endMatch) { const header = beginMatch[1]; const footer = endMatch[2]; let content = normalizedStr.substring(header.length, normalizedStr.length - footer.length); // Clean up only line breaks and carriage returns, preserve base64 content content = content.replace(/[\n\r]/g, '').trim(); // Add proper line breaks (every 64 characters) let formattedContent = ''; for (let i = 0; i < content.length; i += 64) { formattedContent += content.substring(i, Math.min(i + 64, content.length)) + '\n'; } // Reconstruct the certificate return header + '\n' + formattedContent + footer; } } return normalizedStr; } /** * Load certificates from PEM format strings * @param options - Certificate options * @returns Certificate data with Buffer format */ export function loadCertificatesFromString(options) { try { // First try to use certificates without normalization try { let keyStr; let certStr; let caStr; // Convert inputs to strings without aggressive normalization if (Buffer.isBuffer(options.key)) { keyStr = options.key.toString('utf8'); } else { keyStr = options.key; } if (Buffer.isBuffer(options.cert)) { certStr = options.cert.toString('utf8'); } else { certStr = options.cert; } if (options.ca) { if (Buffer.isBuffer(options.ca)) { caStr = options.ca.toString('utf8'); } else { caStr = options.ca; } } // Simple cleanup - only normalize line endings keyStr = keyStr.trim().replace(/\r\n/g, '\n'); certStr = certStr.trim().replace(/\r\n/g, '\n'); if (caStr) { caStr = caStr.trim().replace(/\r\n/g, '\n'); } // Convert to buffers const keyBuffer = Buffer.from(keyStr, 'utf8'); const certBuffer = Buffer.from(certStr, 'utf8'); const caBuffer = caStr ? Buffer.from(caStr, 'utf8') : undefined; // Test the certificates first const secureContext = tls.createSecureContext({ key: keyBuffer, cert: certBuffer, ca: caBuffer }); SmtpLogger.info('Successfully validated certificates without normalization'); return { key: keyBuffer, cert: certBuffer, ca: caBuffer }; } catch (simpleError) { SmtpLogger.warn(`Simple certificate loading failed, trying normalization: ${simpleError instanceof Error ? simpleError.message : String(simpleError)}`); // DEBUG: Log certificate details when simple loading fails SmtpLogger.warn('Certificate loading failure details', { keyType: typeof options.key, certType: typeof options.cert, keyIsBuffer: Buffer.isBuffer(options.key), certIsBuffer: Buffer.isBuffer(options.cert), keyLength: options.key ? options.key.length : 0, certLength: options.cert ? options.cert.length : 0, keyPreview: options.key ? (typeof options.key === 'string' ? options.key.substring(0, 50) : options.key.toString('utf8').substring(0, 50)) : 'null', certPreview: options.cert ? (typeof options.cert === 'string' ? options.cert.substring(0, 50) : options.cert.toString('utf8').substring(0, 50)) : 'null' }); } // Fallback: Try to fix and normalize certificates try { // Normalize certificates (handles both string and Buffer inputs) const key = normalizeCertificate(options.key); const cert = normalizeCertificate(options.cert); const ca = options.ca ? normalizeCertificate(options.ca) : undefined; // Convert normalized strings to Buffer with explicit utf8 encoding const keyBuffer = Buffer.from(key, 'utf8'); const certBuffer = Buffer.from(cert, 'utf8'); const caBuffer = ca ? Buffer.from(ca, 'utf8') : undefined; // Log for debugging SmtpLogger.debug('Certificate properties', { keyLength: keyBuffer.length, certLength: certBuffer.length, caLength: caBuffer ? caBuffer.length : 0 }); // Validate the certificates by attempting to create a secure context try { const secureContext = tls.createSecureContext({ key: keyBuffer, cert: certBuffer, ca: caBuffer }); // If createSecureContext doesn't throw, the certificates are valid SmtpLogger.info('Successfully validated certificate format'); } catch (validationError) { // Log detailed error information for debugging SmtpLogger.error(`Certificate validation error: ${validationError instanceof Error ? validationError.message : String(validationError)}`); SmtpLogger.debug('Certificate validation details', { keyPreview: keyBuffer.toString('utf8').substring(0, 100) + '...', certPreview: certBuffer.toString('utf8').substring(0, 100) + '...', keyLength: keyBuffer.length, certLength: certBuffer.length }); throw validationError; } return { key: keyBuffer, cert: certBuffer, ca: caBuffer }; } catch (innerError) { SmtpLogger.warn(`Certificate normalization failed: ${innerError instanceof Error ? innerError.message : String(innerError)}`); throw innerError; } } catch (error) { SmtpLogger.error(`Error loading certificates: ${error instanceof Error ? error.message : String(error)}`); throw error; } } /** * Load certificates from files * @param options - Certificate file paths * @returns Certificate data with Buffer format */ export function loadCertificatesFromFiles(options) { try { // Read files directly as Buffers const key = fs.readFileSync(options.keyPath); const cert = fs.readFileSync(options.certPath); const ca = options.caPath ? fs.readFileSync(options.caPath) : undefined; // Log for debugging SmtpLogger.debug('Certificate file properties', { keyLength: key.length, certLength: cert.length, caLength: ca ? ca.length : 0 }); // Validate the certificates by attempting to create a secure context try { const secureContext = tls.createSecureContext({ key, cert, ca }); // If createSecureContext doesn't throw, the certificates are valid SmtpLogger.info('Successfully validated certificate files'); } catch (validationError) { SmtpLogger.error(`Certificate file validation error: ${validationError instanceof Error ? validationError.message : String(validationError)}`); throw validationError; } return { key, cert, ca }; } catch (error) { SmtpLogger.error(`Error loading certificate files: ${error instanceof Error ? error.message : String(error)}`); throw error; } } /** * Generate self-signed certificates for testing * @returns Certificate data with Buffer format */ export function generateSelfSignedCertificates() { // This is for fallback/testing only - log a warning SmtpLogger.warn('Generating self-signed certificates for testing - DO NOT USE IN PRODUCTION'); // Create selfsigned certificates using node-forge or similar library // For now, use hardcoded certificates as a last resort const key = Buffer.from(`-----BEGIN PRIVATE KEY----- MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDEgJW1HdJPACGB ifoL3PB+HdAVA2nUmMfq43JbIUPXGTxCtzmQhuV04WjITwFw1loPx3ReHh4KR5yJ BVdzUDocHuauMmBycHAjv7mImR/VkuK/SwT0Q5G/9/M55o6HUNol0UKt+uZuBy1r ggFTdTDLw86i9UG5CZbWF/Yb/DTRoAkCr7iLnaZhhhqcdh5BGj7JBylIAV5RIW1y xQxJVJZQT2KgCeCnHRRvYRQ7tVzUQBcSvtW4zYtqK4C39BgRyLUZQVYB7siGT/uP YJE7R73u0xEgDMFWR1pItUYcVQXHQJ+YsLVCzqI22Mik7URdwxoSHSXRYKn6wnKg 4JYg65JnAgMBAAECggEAM2LlwRhwP0pnLlLHiPE4jJ3Qdz/NUF0hLnRhcUwW1iJ1 03jzCQ4QZ3etfL9O2hVJg49J+QUG50FNduLq4SE7GZj1dEJ/YNnlk9PpI8GSpLuA mGTUKofIEJjNy5gKR0c6/rfgP8UXYSbRnTnZwIXVkUYuAUJLJTBVcJlcvCwJ3/zz C8789JyOO1CNwF3zEIALdW5X5se8V+sw5iHDrHVxkR2xgsYpBBOylFfBxbMvV5o1 i+QOD1HaXdmIvjBCnHqrjX5SDnAYwHBSB9y6WbwC+Th76QHkRNcHZH86PJVdLEUi tBPQmQh+SjDRaZzDJvURnOFks+eEsCPVPZnQ4wgnAQKBgQD8oHwGZIZRUjnXULNc vJoPcjLpvdHRO0kXTJHtG2au2i9jVzL9SFwH1lHQM0XdXPnR2BK4Gmgc2dRnSB9n YPPvCgyL2RS0Y7W98yEcgBgwVOJHnPQGRNwxUfCTHgmCQ7lXjQKKG51+dBfOYP3j w8VYbS2pqxZtzzZ5zhk2BrZJdwKBgQDHDZC+NU80f7rLEr5vpwx9epTArwXre8oj nGgzZ9/lE14qDnITBuZPUHWc4/7U1CCmP0vVH6nFVvhN9ra9QCTJBzQ5aj0l3JM7 9j8R5QZIPqOu4+aqf0ZFEgmpBK2SAYqNrJ+YVa2T/zLF44Jlr5WiLkPTUyMxV5+k P4ZK8QP7wQKBgQCbeLuRWCuVKNYgYjm9TA55BbJL82J+MvhcbXUccpUksJQRxMV3 98PBUW0Qw38WciJxQF4naSKD/jXYndD+wGzpKMIU+tKU+sEYMnuFnx13++K8XrAe NQPHDsK1wRgXk5ygOHx78xnZbMmwBXNLwQXIhyO8FJpwJHj2CtYvjb+2xwKBgQCn KW/RiAHvG6GKjCHCOTlx2qLPxUiXYCk2xwvRnNfY5+2PFoqMI/RZLT/41kTda1fA TDw+j4Uu/fF2ChPadwRiUjXZzZx/UjcMJXTpQ2kpbGJ11U/cL4+Tk0S6wz+HoS7z w3vXT9UoDyFxDBjuMQJxJWTjmymaYUtNnz4iMuRqwQKBgH+HKbYHCZaIzXRMEO5S T3xDMYH59dTEKKXEOA1KJ9Zo5XSD8NE9SQ+9etoOcEq8tdYS45OkHD3VyFQa7THu 58awjTdkpSmMPsw3AElOYDYJgD9oxKtTjwkXHqMjDBQZrXqzOImOAJhEVL+XH3LP lv6RZ47YRC88T+P6n1yg6BPp -----END PRIVATE KEY-----`, 'utf8'); const cert = Buffer.from(`-----BEGIN CERTIFICATE----- MIIDCTCCAfGgAwIBAgIUHxmGQOQoiSbzqh6hIe+7h9xDXIUwDQYJKoZIhvcNAQEL BQAwFDESMBAGA1UEAwwJbG9jYWxob3N0MB4XDTI1MDUyMTE2MDAzM1oXDTI2MDUy MTE2MDAzM1owFDESMBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEAxICVtR3STwAhgYn6C9zwfh3QFQNp1JjH6uNyWyFD1xk8 Qrc5kIbldOFoyE8BcNZaD8d0Xh4eCkeciwOV3FwHR4brjJgcnRwI7+5iJkf1ZLiv 0sE9EORv/fzOeaOh1DaJdFCrfrmbgdgOUm62WNQOB2hq0kggjh/S1K+TBfF+8QFs XQyW7y7mHecNgCgK/pI5b1irdajRc7nLvzM/U8qNn4jjrLsRoYqBPpn7aLKIBrmN pNSIe18q8EYWkdmWBcnsZpAYv75SJG8E0lAYpMv9OEUIwsPh7AYUdkZqKtFxVxV5 bYlA5ZfnVnWrWEwRXaVdFFRXIjP+EFkGYYWThbvAIb0TPQIDAQABo1MwUTAdBgNV HQ4EFgQUiW1MoYR8YK9KJTyip5oFoUVJoCgwHwYDVR0jBBgwFoAUiW1MoYR8YK9K JTyip5oFoUVJoCgwDwYDVR0TAQH/BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEA BToM8SbUQXwJ9rTlQB2QI2GJaFwTpCFoQZwGUOCkwGLM3nOPLEbNPMDoIKGPwenB P1xL8uJEgYRqP6UG/xy3HsxYsLCxuoxGGP2QjuiQKnFl0n85usZ5flCxmLC5IzYx FLcR6WPTdj6b5JX0tM8Bi6toQ9Pj3u3dSVPZKRLYvJvZKt1PXI8qsHD/LvNa2wGG Zi1BQFAr2cScNYa+p6IYDJi9TBNxoBIHNTzQPfWaen4MHRJqUNZCzQXcOnU/NW5G +QqQSEMmk8yGucEHWUMFrEbABVgYuBslICEEtBZALB2jZJYSaJnPOJCcmFrxUv61 ORWZbz+8rBL0JIeA7eFxEA== -----END CERTIFICATE-----`, 'utf8'); return { key, cert }; } /** * Create TLS options for secure server or STARTTLS * @param certificates - Certificate data * @param isServer - Whether this is for server (true) or client (false) * @returns TLS options */ export function createTlsOptions(certificates, isServer = true) { const options = { key: certificates.key, cert: certificates.cert, ca: certificates.ca, // Support a wider range of TLS versions for better compatibility minVersion: 'TLSv1', // Support older TLS versions (minimum TLS 1.0) maxVersion: 'TLSv1.3', // Support latest TLS version (1.3) // Cipher suites for broad compatibility ciphers: 'HIGH:MEDIUM:!aNULL:!eNULL:!NULL:!ADH:!RC4', // For testing, allow unauthorized (self-signed certs) rejectUnauthorized: false, // Longer handshake timeout for reliability handshakeTimeout: 30000, // TLS renegotiation option (removed - not supported in newer Node.js) // Increase timeout for better reliability under test conditions sessionTimeout: 600, // Let the client choose the cipher for better compatibility honorCipherOrder: false, // For debugging enableTrace: true, // Disable secure options to allow more flexibility secureOptions: 0 }; // Server-specific options if (isServer) { options.ALPNProtocols = ['smtp']; // Accept non-ALPN connections (legacy clients) } return options; } //# 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