3.41.4

changelog.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## 2025-03-12 - 3.41.4 - fix(tls/sni)
+Improve logging for TLS session resumption by extracting and logging SNI values from ClientHello messages.
+
+- Added logging to output the extracted SNI value during renegotiation, initial ClientHello and in the SNI handler.
+- Enhanced error handling during SNI extraction to aid troubleshooting of TLS session resumption issues.
+
+## 2025-03-12 - 3.41.3 - fix(TLS/SNI)
+Improve TLS session resumption handling and logging. Now, session resumption attempts are always logged with details, and connections without a proper SNI are rejected when allowSessionTicket is disabled. In addition, empty SNI extensions are explicitly treated as missing, ensuring stricter and more consistent TLS handshake validation.
+
+- Always log session resumption in both renegotiation and initial ClientHello processing.
+- Terminate connections that attempt session resumption without SNI when allowSessionTicket is false.
+- Treat empty SNI extensions as absence of SNI to improve consistency in TLS handshake processing.
+
 ## 2025-03-11 - 3.41.2 - fix(SniHandler)
 Refactor hasSessionResumption to return detailed session resumption info
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartproxy",
-  "version": "3.41.2",
+  "version": "3.41.4",
   "private": false,
   "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.",
   "main": "dist_ts/index.js",

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartproxy',
-  version: '3.41.2',
+  version: '3.41.4',
   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

@@ -943,20 +943,32 @@ export class PortProxy {
                 // Analyze for session resumption attempt (session ticket or PSK)
                 const resumptionInfo = SniHandler.hasSessionResumption(renegChunk, this.settings.enableTlsDebugLogging);
                 
-                // Only block if there's a session ticket without SNI
-                if (resumptionInfo.isResumption && !resumptionInfo.hasSNI) {
+                if (resumptionInfo.isResumption) {
+                  // Always log resumption attempt for easier debugging
+                  // Try to extract SNI for logging
+                  const extractedSNI = SniHandler.extractSNI(renegChunk, this.settings.enableTlsDebugLogging);
                   console.log(
-                    `[${connectionId}] Session ticket detected in renegotiation without SNI and allowSessionTicket=false. ` +
-                    `Terminating connection to force new TLS handshake.`
+                    `[${connectionId}] Session resumption detected in renegotiation. ` +
+                    `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
+                    `SNI value: ${extractedSNI || 'None'}, ` +
+                    `allowSessionTicket: ${this.settings.allowSessionTicket}`
                   );
-                  this.initiateCleanupOnce(record, 'session_ticket_blocked');
-                  return;
-                } else if (resumptionInfo.isResumption && resumptionInfo.hasSNI) {
-                  if (this.settings.enableTlsDebugLogging) {
+                  
+                  // Block if there's session resumption without SNI
+                  if (!resumptionInfo.hasSNI) {
                     console.log(
-                      `[${connectionId}] Session ticket with SNI detected in renegotiation. ` +
-                      `Allowing connection since SNI is present.`
+                      `[${connectionId}] Session resumption detected in renegotiation without SNI and allowSessionTicket=false. ` +
+                      `Terminating connection to force new TLS handshake.`
                     );
+                    this.initiateCleanupOnce(record, 'session_ticket_blocked');
+                    return;
+                  } else {
+                    if (this.settings.enableDetailedLogging) {
+                      console.log(
+                        `[${connectionId}] Session resumption with SNI detected in renegotiation. ` +
+                        `Allowing connection since SNI is present.`
+                      );
+                    }
                   }
                 }
               }
@@ -1575,25 +1587,37 @@ export class PortProxy {
               // Analyze for session resumption attempt
               const resumptionInfo = SniHandler.hasSessionResumption(chunk, this.settings.enableTlsDebugLogging);
               
-              // Only block if there's a session ticket without SNI
-              if (resumptionInfo.isResumption && !resumptionInfo.hasSNI) {
+              if (resumptionInfo.isResumption) {
+                // Always log resumption attempt for easier debugging
+                // Try to extract SNI for logging
+                const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
                 console.log(
-                  `[${connectionId}] Session ticket detected in initial ClientHello without SNI and allowSessionTicket=false. ` +
-                  `Terminating connection to force new TLS handshake.`
+                  `[${connectionId}] Session resumption detected in initial ClientHello. ` +
+                  `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
+                  `SNI value: ${extractedSNI || 'None'}, ` +
+                  `allowSessionTicket: ${this.settings.allowSessionTicket}`
                 );
-                if (connectionRecord.incomingTerminationReason === null) {
-                  connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
-                  this.incrementTerminationStat('incoming', 'session_ticket_blocked');
-                }
-                socket.end();
-                this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
-                return;
-              } else if (resumptionInfo.isResumption && resumptionInfo.hasSNI) {
-                if (this.settings.enableTlsDebugLogging) {
+                
+                // Block if there's session resumption without SNI
+                if (!resumptionInfo.hasSNI) {
                   console.log(
-                    `[${connectionId}] Session ticket with SNI detected in initial ClientHello. ` +
-                    `Allowing connection since SNI is present.`
+                    `[${connectionId}] Session resumption detected in initial ClientHello without SNI and allowSessionTicket=false. ` +
+                    `Terminating connection to force new TLS handshake.`
                   );
+                  if (connectionRecord.incomingTerminationReason === null) {
+                    connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
+                    this.incrementTerminationStat('incoming', 'session_ticket_blocked');
+                  }
+                  socket.end();
+                  this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
+                  return;
+                } else {
+                  if (this.settings.enableDetailedLogging) {
+                    console.log(
+                      `[${connectionId}] Session resumption with SNI detected in initial ClientHello. ` +
+                      `Allowing connection since SNI is present.`
+                    );
+                  }
                 }
               }
             }
@@ -1949,25 +1973,37 @@ export class PortProxy {
                 // Analyze for session resumption attempt
                 const resumptionInfo = SniHandler.hasSessionResumption(chunk, this.settings.enableTlsDebugLogging);
                 
-                // Only block if there's a session ticket without SNI
-                if (resumptionInfo.isResumption && !resumptionInfo.hasSNI) {
+                if (resumptionInfo.isResumption) {
+                  // Always log resumption attempt for easier debugging
+                  // Try to extract SNI for logging
+                  const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
                   console.log(
-                    `[${connectionId}] Session ticket detected in initial ClientHello without SNI and allowSessionTicket=false. ` +
-                    `Terminating connection to force new TLS handshake.`
+                    `[${connectionId}] Session resumption detected in SNI handler. ` +
+                    `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
+                    `SNI value: ${extractedSNI || 'None'}, ` +
+                    `allowSessionTicket: ${this.settings.allowSessionTicket}`
                   );
-                  if (connectionRecord.incomingTerminationReason === null) {
-                    connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
-                    this.incrementTerminationStat('incoming', 'session_ticket_blocked');
-                  }
-                  socket.end();
-                  this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
-                  return;
-                } else if (resumptionInfo.isResumption && resumptionInfo.hasSNI) {
-                  if (this.settings.enableTlsDebugLogging) {
+                  
+                  // Block if there's session resumption without SNI
+                  if (!resumptionInfo.hasSNI) {
                     console.log(
-                      `[${connectionId}] Session ticket with SNI detected in initial ClientHello. ` +
-                      `Allowing connection since SNI is present.`
+                      `[${connectionId}] Session resumption detected in SNI handler without SNI and allowSessionTicket=false. ` +
+                      `Terminating connection to force new TLS handshake.`
                     );
+                    if (connectionRecord.incomingTerminationReason === null) {
+                      connectionRecord.incomingTerminationReason = 'session_ticket_blocked';
+                      this.incrementTerminationStat('incoming', 'session_ticket_blocked');
+                    }
+                    socket.end();
+                    this.cleanupConnection(connectionRecord, 'session_ticket_blocked');
+                    return;
+                  } else {
+                    if (this.settings.enableDetailedLogging) {
+                      console.log(
+                        `[${connectionId}] Session resumption with SNI detected in SNI handler. ` +
+                        `Allowing connection since SNI is present.`
+                      );
+                    }
                   }
                 }
               }

ts/classes.snihandler.ts

@@ -410,8 +410,42 @@ export class SniHandler {
                   pos += 2;
                   
                   if (extensionType === this.TLS_SNI_EXTENSION_TYPE) {
-                    hasSNI = true;
-                    log('Found SNI extension');
+                    // Check that the SNI extension actually has content
+                    if (extensionLength > 0) {
+                      hasSNI = true;
+                      
+                      // Try to extract the actual SNI value for logging
+                      try {
+                        // Skip to server_name_list_length (2 bytes)
+                        const tempPos = pos;
+                        if (tempPos + 2 <= extensionsEnd) {
+                          const nameListLength = (buffer[tempPos] << 8) + buffer[tempPos + 1];
+                          
+                          // Skip server_name_list_length (2 bytes)
+                          if (tempPos + 2 + 1 <= extensionsEnd) {
+                            // Check name_type (should be 0 for hostname)
+                            if (buffer[tempPos + 2] === 0) {
+                              // Skip name_type (1 byte)
+                              if (tempPos + 3 + 2 <= extensionsEnd) {
+                                // Get name_length (2 bytes)
+                                const nameLength = (buffer[tempPos + 3] << 8) + buffer[tempPos + 4];
+                                
+                                // Extract the hostname
+                                if (tempPos + 5 + nameLength <= extensionsEnd) {
+                                  const hostname = buffer.slice(tempPos + 5, tempPos + 5 + nameLength).toString('utf8');
+                                  log(`Found SNI extension with server_name: ${hostname}`);
+                                }
+                              }
+                            }
+                          }
+                        }
+                      } catch (e) {
+                        log(`Error extracting SNI value: ${e}`);
+                        log('Found SNI extension with length: ' + extensionLength);
+                      }
+                    } else {
+                      log('Found empty SNI extension, treating as no SNI');
+                    }
                     break;
                   }
                   
@@ -438,6 +472,15 @@ export class SniHandler {
       }
       
       // Return an object with both flags
+      // For clarity: connections should be blocked if they have session resumption without SNI
+      if (isResumption) {
+        log(`Resumption summary - hasSNI: ${hasSNI ? 'yes' : 'no'}, resumption type: ${
+          hasSessionTicket ? 'session ticket, ' : ''
+        }${hasPSK ? 'PSK, ' : ''}${hasEarlyData ? 'early data, ' : ''}${
+          hasNonEmptySessionId ? 'session ID' : ''
+        }`);
+      }
+      
       return { 
         isResumption, 
         hasSNI