BREAKING CHANGE(rust-bridge): make Rust the primary security backend, remove all TS fallbacks

Phase 3 of the Rust migration: the Rust security bridge is now mandatory
and all TypeScript security fallback implementations have been removed.

- UnifiedEmailServer.start() throws if Rust bridge fails to start
- SpfVerifier gutted to thin wrapper (parseSpfRecord stays in TS)
- DKIMVerifier gutted to thin wrapper delegating to bridge.verifyDkim()
- IPReputationChecker delegates to bridge.checkIpReputation(), keeps LRU cache
- DmarcVerifier keeps alignment logic (works with pre-computed results)
- DKIM signing via bridge.signDkim() in all 4 locations
- Removed mailauth and ip packages from plugins.ts (~1,200 lines deleted)

ts/mail/security/classes.dkimverifier.ts

@@ -1,7 +1,6 @@
-import * as plugins from '../../plugins.js';
-// MtaService reference removed
 import { logger } from '../../logger.js';
 import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
+import { RustSecurityBridge } from '../../security/classes.rustsecuritybridge.js';
 
 /**
  * Result of a DKIM verification
@@ -17,23 +16,13 @@ export interface IDkimVerificationResult {
 }
 
 /**
- * Enhanced DKIM verifier using smartmail capabilities
+ * DKIM verifier — delegates to the Rust security bridge.
  */
 export class DKIMVerifier {
-  // MtaRef reference removed
-  
-  // Cache verified results to avoid repeated verification
-  private verificationCache: Map<string, { result: IDkimVerificationResult, timestamp: number }> = new Map();
-  private cacheTtl = 30 * 60 * 1000; // 30 minutes cache
-
-  constructor() {
-  }
+  constructor() {}
 
   /**
-   * Verify DKIM signature for an email
-   * @param emailData The raw email data
-   * @param options Verification options
-   * @returns Verification result
+   * Verify DKIM signature for an email via Rust bridge
    */
   public async verify(
     emailData: string,
@@ -43,340 +32,55 @@ export class DKIMVerifier {
     } = {}
   ): Promise<IDkimVerificationResult> {
     try {
-      // Generate a cache key from the first 128 bytes of the email data
-      const cacheKey = emailData.slice(0, 128);
+      const bridge = RustSecurityBridge.getInstance();
+      const results = await bridge.verifyDkim(emailData);
+      const first = results[0];
 
-      // Check cache if enabled
-      if (options.useCache !== false) {
-        const cached = this.verificationCache.get(cacheKey);
-        
-        if (cached && (Date.now() - cached.timestamp) < this.cacheTtl) {
-          logger.log('info', 'DKIM verification result from cache');
-          return cached.result;
-        }
-      }
+      const result: IDkimVerificationResult = {
+        isValid: first?.is_valid ?? false,
+        domain: first?.domain ?? undefined,
+        selector: first?.selector ?? undefined,
+        status: first?.status ?? 'none',
+        details: options.returnDetails ? results : undefined,
+      };
 
-      // Try to verify using mailauth first
-      try {
-        const verificationMailauth = await plugins.mailauth.authenticate(emailData, {});
-        
-        if (verificationMailauth && verificationMailauth.dkim && verificationMailauth.dkim.results.length > 0) {
-          const dkimResult = verificationMailauth.dkim.results[0];
-          const isValid = dkimResult.status.result === 'pass';
-          
-          const result: IDkimVerificationResult = {
-            isValid,
-            domain: dkimResult.signingDomain,
-            selector: dkimResult.selector,
-            status: dkimResult.status.result,
-            signatureFields: (dkimResult as any).signature,
-            details: options.returnDetails ? verificationMailauth : undefined
-          };
-          
-          // Cache the result
-          this.verificationCache.set(cacheKey, {
-            result,
-            timestamp: Date.now()
-          });
-          
-          logger.log(isValid ? 'info' : 'warn', `DKIM Verification using mailauth: ${isValid ? 'pass' : 'fail'} for domain ${dkimResult.signingDomain}`);
-          
-          // Enhanced security logging
-          SecurityLogger.getInstance().logEvent({
-            level: isValid ? SecurityLogLevel.INFO : SecurityLogLevel.WARN,
-            type: SecurityEventType.DKIM,
-            message: `DKIM verification ${isValid ? 'passed' : 'failed'} for domain ${dkimResult.signingDomain}`,
-            details: {
-              selector: dkimResult.selector,
-              signatureFields: (dkimResult as any).signature,
-              result: dkimResult.status.result
-            },
-            domain: dkimResult.signingDomain,
-            success: isValid
-          });
-          
-          return result;
-        }
-      } catch (mailauthError) {
-        logger.log('warn', `DKIM verification with mailauth failed, trying smartmail: ${mailauthError.message}`);
-        
-        // Enhanced security logging
-        SecurityLogger.getInstance().logEvent({
-          level: SecurityLogLevel.WARN,
-          type: SecurityEventType.DKIM,
-          message: `DKIM verification with mailauth failed, trying smartmail fallback`,
-          details: { error: mailauthError.message },
-          success: false
-        });
-      }
+      SecurityLogger.getInstance().logEvent({
+        level: result.isValid ? SecurityLogLevel.INFO : SecurityLogLevel.WARN,
+        type: SecurityEventType.DKIM,
+        message: `DKIM verification ${result.isValid ? 'passed' : 'failed'} for domain ${result.domain || 'unknown'}`,
+        details: { selector: result.selector, status: result.status },
+        domain: result.domain || 'unknown',
+        success: result.isValid
+      });
 
-      // Fall back to smartmail for verification
-      try {
-        // Parse and extract DKIM signature
-        const parsedEmail = await plugins.mailparser.simpleParser(emailData);
-        
-        // Find DKIM signature header
-        let dkimSignature = '';
-        if (parsedEmail.headers.has('dkim-signature')) {
-          dkimSignature = parsedEmail.headers.get('dkim-signature') as string;
-        } else {
-          // No DKIM signature found
-          const result: IDkimVerificationResult = {
-            isValid: false,
-            errorMessage: 'No DKIM signature found'
-          };
-          
-          this.verificationCache.set(cacheKey, {
-            result,
-            timestamp: Date.now()
-          });
-          
-          return result;
-        }
-        
-        // Extract domain from DKIM signature
-        const domainMatch = dkimSignature.match(/d=([^;]+)/i);
-        const domain = domainMatch ? domainMatch[1].trim() : undefined;
-        
-        // Extract selector from DKIM signature
-        const selectorMatch = dkimSignature.match(/s=([^;]+)/i);
-        const selector = selectorMatch ? selectorMatch[1].trim() : undefined;
-        
-        // Parse DKIM fields
-        const signatureFields: Record<string, string> = {};
-        const fieldMatches = dkimSignature.matchAll(/([a-z]+)=([^;]+)/gi);
-        for (const match of fieldMatches) {
-          if (match[1] && match[2]) {
-            signatureFields[match[1].toLowerCase()] = match[2].trim();
-          }
-        }
-        
-        // Use smartmail's verification if we have domain and selector
-        if (domain && selector) {
-          const dkimKey = await this.fetchDkimKey(domain, selector);
-          
-          if (!dkimKey) {
-            const result: IDkimVerificationResult = {
-              isValid: false,
-              domain,
-              selector,
-              status: 'permerror',
-              errorMessage: 'DKIM public key not found',
-              signatureFields
-            };
-            
-            this.verificationCache.set(cacheKey, {
-              result,
-              timestamp: Date.now()
-            });
-            
-            return result;
-          }
-          
-          // In a real implementation, we would validate the signature here
-          // For now, if we found a key, we'll consider it valid
-          // In a future update, add actual crypto verification
-          
-          const result: IDkimVerificationResult = {
-            isValid: true,
-            domain,
-            selector,
-            status: 'pass',
-            signatureFields
-          };
-          
-          this.verificationCache.set(cacheKey, {
-            result,
-            timestamp: Date.now()
-          });
-          
-          logger.log('info', `DKIM verification using smartmail: pass for domain ${domain}`);
-          
-          // Enhanced security logging
-          SecurityLogger.getInstance().logEvent({
-            level: SecurityLogLevel.INFO,
-            type: SecurityEventType.DKIM,
-            message: `DKIM verification passed for domain ${domain} using fallback verification`,
-            details: {
-              selector,
-              signatureFields
-            },
-            domain,
-            success: true
-          });
-          
-          return result;
-        } else {
-          // Missing domain or selector
-          const result: IDkimVerificationResult = {
-            isValid: false,
-            domain,
-            selector,
-            status: 'permerror',
-            errorMessage: 'Missing domain or selector in DKIM signature',
-            signatureFields
-          };
-          
-          this.verificationCache.set(cacheKey, {
-            result,
-            timestamp: Date.now()
-          });
-          
-          logger.log('warn', `DKIM verification failed: Missing domain or selector in DKIM signature`);
-          
-          // Enhanced security logging
-          SecurityLogger.getInstance().logEvent({
-            level: SecurityLogLevel.WARN,
-            type: SecurityEventType.DKIM,
-            message: `DKIM verification failed: Missing domain or selector in signature`,
-            details: { domain, selector, signatureFields },
-            domain: domain || 'unknown',
-            success: false
-          });
-          
-          return result;
-        }
-      } catch (error) {
-        const result: IDkimVerificationResult = {
-          isValid: false,
-          status: 'temperror',
-          errorMessage: `Verification error: ${error.message}`
-        };
-        
-        this.verificationCache.set(cacheKey, {
-          result,
-          timestamp: Date.now()
-        });
-        
-        logger.log('error', `DKIM verification error: ${error.message}`);
-        
-        // Enhanced security logging
-        SecurityLogger.getInstance().logEvent({
-          level: SecurityLogLevel.ERROR,
-          type: SecurityEventType.DKIM,
-          message: `DKIM verification error during processing`,
-          details: { error: error.message },
-          success: false
-        });
-        
-        return result;
-      }
+      logger.log(result.isValid ? 'info' : 'warn',
+        `DKIM verification: ${result.status} for domain ${result.domain || 'unknown'}`);
+
+      return result;
     } catch (error) {
-      logger.log('error', `DKIM verification failed with unexpected error: ${error.message}`);
-      
-      // Enhanced security logging for unexpected errors
+      logger.log('error', `DKIM verification failed: ${error.message}`);
+
       SecurityLogger.getInstance().logEvent({
         level: SecurityLogLevel.ERROR,
         type: SecurityEventType.DKIM,
-        message: `DKIM verification failed with unexpected error`,
+        message: `DKIM verification error`,
         details: { error: error.message },
         success: false
       });
-      
+
       return {
         isValid: false,
         status: 'temperror',
-        errorMessage: `Unexpected verification error: ${error.message}`
+        errorMessage: `Verification error: ${error.message}`
       };
     }
   }
 
-  /**
-   * Fetch DKIM public key from DNS
-   * @param domain The domain
-   * @param selector The DKIM selector
-   * @returns The DKIM public key or null if not found
-   */
-  private async fetchDkimKey(domain: string, selector: string): Promise<string | null> {
-    try {
-      const dkimRecord = `${selector}._domainkey.${domain}`;
-      
-      // Use DNS lookup from plugins
-      const txtRecords = await new Promise<string[]>((resolve, reject) => {
-        plugins.dns.resolveTxt(dkimRecord, (err, records) => {
-          if (err) {
-            if (err.code === 'ENOTFOUND' || err.code === 'ENODATA') {
-              resolve([]);
-            } else {
-              reject(err);
-            }
-            return;
-          }
-          // Flatten the arrays that resolveTxt returns
-          resolve(records.map(record => record.join('')));
-        });
-      });
-      
-      if (!txtRecords || txtRecords.length === 0) {
-        logger.log('warn', `No DKIM TXT record found for ${dkimRecord}`);
-        
-        // Security logging for missing DKIM record
-        SecurityLogger.getInstance().logEvent({
-          level: SecurityLogLevel.WARN,
-          type: SecurityEventType.DKIM,
-          message: `No DKIM TXT record found for ${dkimRecord}`,
-          domain,
-          success: false,
-          details: { selector }
-        });
-        
-        return null;
-      }
-      
-      // Find record matching DKIM format
-      for (const record of txtRecords) {
-        if (record.includes('p=')) {
-          // Extract public key
-          const publicKeyMatch = record.match(/p=([^;]+)/i);
-          if (publicKeyMatch && publicKeyMatch[1]) {
-            return publicKeyMatch[1].trim();
-          }
-        }
-      }
-      
-      logger.log('warn', `No valid DKIM public key found in TXT records for ${dkimRecord}`);
-      
-      // Security logging for invalid DKIM key
-      SecurityLogger.getInstance().logEvent({
-        level: SecurityLogLevel.WARN,
-        type: SecurityEventType.DKIM,
-        message: `No valid DKIM public key found in TXT records`,
-        domain,
-        success: false,
-        details: { dkimRecord, selector }
-      });
-      
-      return null;
-    } catch (error) {
-      logger.log('error', `Error fetching DKIM key: ${error.message}`);
-      
-      // Security logging for DKIM key fetch error
-      SecurityLogger.getInstance().logEvent({
-        level: SecurityLogLevel.ERROR,
-        type: SecurityEventType.DKIM,
-        message: `Error fetching DKIM key for domain`,
-        domain,
-        success: false,
-        details: { error: error.message, selector, dkimRecord: `${selector}._domainkey.${domain}` }
-      });
-      
-      return null;
-    }
-  }
-  
-  /**
-   * Clear the verification cache
-   */
-  public clearCache(): void {
-    this.verificationCache.clear();
-    logger.log('info', 'DKIM verification cache cleared');
-  }
-  
-  /**
-   * Get the size of the verification cache
-   * @returns Number of cached items
-   */
+  /** No-op — Rust bridge handles its own caching */
+  public clearCache(): void {}
+
+  /** Always 0 — cache is managed by the Rust side */
   public getCacheSize(): number {
-    return this.verificationCache.size;
+    return 0;
   }
-}
+}