fix(portproxy): Enforce TLS handshake and SNI validation on port 443 by blocking non-TLS connections and terminating session resumption attempts without SNI when allowSessionTicket is disabled.

changelog.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 2025-03-12 - 3.41.5 - fix(portproxy)
+Enforce TLS handshake and SNI validation on port 443 by blocking non-TLS connections and terminating session resumption attempts without SNI when allowSessionTicket is disabled.
+
+- Added explicit check to block non-TLS connections on port 443 to ensure proper TLS usage.
+- Enhanced logging for TLS ClientHello to include details on SNI extraction and session resumption status.
+- Terminate connections with missing SNI by setting termination reasons ('session_ticket_blocked' or 'no_sni_blocked').
+- Ensured consistent rejection of non-TLS handshakes on standard HTTPS port.
+
 ## 2025-03-12 - 3.41.4 - fix(tls/sni)
 Improve logging for TLS session resumption by extracting and logging SNI values from ClientHello messages.
 

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartproxy',
-  version: '3.41.4',
+  version: '3.41.5',
   description: 'A powerful proxy package that effectively handles high traffic, with features such as SSL/TLS support, port proxying, WebSocket handling, dynamic routing with authentication options, and automatic ACME certificate management.'
 }

ts/classes.portproxy.ts

@@ -1577,48 +1577,73 @@ export class PortProxy {
 
           initialDataReceived = true;
           connectionRecord.hasReceivedInitialData = true;
+          
+          // Block non-TLS connections on port 443
+          // Always enforce TLS on standard HTTPS port
+          if (!SniHandler.isTlsHandshake(chunk) && localPort === 443) {
+            console.log(
+              `[${connectionId}] Non-TLS connection detected on port 443. ` +
+              `Terminating connection - only TLS traffic is allowed on standard HTTPS port.`
+            );
+            if (connectionRecord.incomingTerminationReason === null) {
+              connectionRecord.incomingTerminationReason = 'non_tls_blocked';
+              this.incrementTerminationStat('incoming', 'non_tls_blocked');
+            }
+            socket.end();
+            this.cleanupConnection(connectionRecord, 'non_tls_blocked');
+            return;
+          }
 
           // Check if this looks like a TLS handshake
           if (SniHandler.isTlsHandshake(chunk)) {
             connectionRecord.isTLS = true;
             
-            // Check for session tickets if allowSessionTicket is disabled
+            // Check for TLS ClientHello with either no SNI or session tickets
             if (this.settings.allowSessionTicket === false && SniHandler.isClientHello(chunk)) {
+              // Extract SNI first
+              const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
+              const hasSNI = !!extractedSNI;
+              
               // Analyze for session resumption attempt
               const resumptionInfo = SniHandler.hasSessionResumption(chunk, this.settings.enableTlsDebugLogging);
               
-              if (resumptionInfo.isResumption) {
-                // Always log resumption attempt for easier debugging
-                // Try to extract SNI for logging
-                const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
+              // Always log for debugging purposes
+              console.log(
+                `[${connectionId}] TLS ClientHello detected with allowSessionTicket=false. ` +
+                `Has SNI: ${hasSNI ? 'Yes' : 'No'}, ` +
+                `SNI value: ${extractedSNI || 'None'}, ` +
+                `Has session resumption: ${resumptionInfo.isResumption ? 'Yes' : 'No'}`
+              );
+              
+              // Block if this is a connection with session resumption but no SNI
+              if (resumptionInfo.isResumption && !hasSNI) {
                 console.log(
-                  `[${connectionId}] Session resumption detected in initial ClientHello. ` +
-                  `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
-                  `SNI value: ${extractedSNI || 'None'}, ` +
-                  `allowSessionTicket: ${this.settings.allowSessionTicket}`
+                  `[${connectionId}] Session resumption detected in initial ClientHello without SNI and allowSessionTicket=false. ` +
+                  `Terminating connection to force new TLS handshake.`
                 );
-                
-                // Block if there's session resumption without SNI
-                if (!resumptionInfo.hasSNI) {
-                  console.log(
-                    `[${connectionId}] Session resumption detected in initial ClientHello without SNI and allowSessionTicket=false. ` +
-                    `Terminating connection to force new TLS handshake.`
-                  );
-                  if (connectionRecord.incomingTerminationReason === null) {
-                    connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
-                    this.incrementTerminationStat('incoming', 'session_ticket_blocked');
-                  }
-                  socket.end();
-                  this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
-                  return;
-                } else {
-                  if (this.settings.enableDetailedLogging) {
-                    console.log(
-                      `[${connectionId}] Session resumption with SNI detected in initial ClientHello. ` +
-                      `Allowing connection since SNI is present.`
-                    );
-                  }
+                if (connectionRecord.incomingTerminationReason === null) {
+                  connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
+                  this.incrementTerminationStat('incoming', 'session_ticket_blocked');
                 }
+                socket.end();
+                this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
+                return;
+              }
+              
+              // Also block if this is a TLS connection without SNI when allowSessionTicket is false
+              // This forces clients to send SNI which helps with routing
+              if (!hasSNI && localPort === 443) {
+                console.log(
+                  `[${connectionId}] TLS ClientHello detected on port 443 without SNI and allowSessionTicket=false. ` +
+                  `Terminating connection to force proper SNI in handshake.`
+                );
+                if (connectionRecord.incomingTerminationReason === null) {
+                  connectionRecord.incomingTerminationReason = 'no_sni_blocked';
+                  this.incrementTerminationStat('incoming', 'no_sni_blocked');
+                }
+                socket.end();
+                this.cleanupConnection(connectionRecord, 'no_sni_blocked');
+                return;
               }
             }
             
@@ -1955,6 +1980,22 @@ export class PortProxy {
             }
 
             initialDataReceived = true;
+            
+            // Block non-TLS connections on port 443
+            // Always enforce TLS on standard HTTPS port
+            if (!SniHandler.isTlsHandshake(chunk) && localPort === 443) {
+              console.log(
+                `[${connectionId}] Non-TLS connection detected on port 443 in SNI handler. ` +
+                `Terminating connection - only TLS traffic is allowed on standard HTTPS port.`
+              );
+              if (connectionRecord.incomingTerminationReason === null) {
+                connectionRecord.incomingTerminationReason = 'non_tls_blocked';
+                this.incrementTerminationStat('incoming', 'non_tls_blocked');
+              }
+              socket.end();
+              this.cleanupConnection(connectionRecord, 'non_tls_blocked');
+              return;
+            }
 
             // Try to extract SNI
             let serverName = '';