fix(tls/sni): Improve logging for TLS session resumption by extracting and logging SNI values from ClientHello messages.
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@ -1,5 +1,11 @@
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# Changelog
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## 2025-03-12 - 3.41.4 - fix(tls/sni)
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Improve logging for TLS session resumption by extracting and logging SNI values from ClientHello messages.
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- Added logging to output the extracted SNI value during renegotiation, initial ClientHello and in the SNI handler.
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- Enhanced error handling during SNI extraction to aid troubleshooting of TLS session resumption issues.
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## 2025-03-12 - 3.41.3 - fix(TLS/SNI)
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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.
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@ -3,6 +3,6 @@
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*/
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export const commitinfo = {
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name: '@push.rocks/smartproxy',
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version: '3.41.3',
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version: '3.41.4',
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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.'
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}
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@ -945,9 +945,13 @@ export class PortProxy {
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if (resumptionInfo.isResumption) {
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// Always log resumption attempt for easier debugging
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// Try to extract SNI for logging
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const extractedSNI = SniHandler.extractSNI(renegChunk, this.settings.enableTlsDebugLogging);
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console.log(
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`[${connectionId}] Session resumption detected in renegotiation. ` +
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, allowSessionTicket: ${this.settings.allowSessionTicket}`
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
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`SNI value: ${extractedSNI || 'None'}, ` +
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`allowSessionTicket: ${this.settings.allowSessionTicket}`
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);
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// Block if there's session resumption without SNI
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@ -1585,9 +1589,13 @@ export class PortProxy {
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if (resumptionInfo.isResumption) {
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// Always log resumption attempt for easier debugging
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// Try to extract SNI for logging
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const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
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console.log(
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`[${connectionId}] Session resumption detected in initial ClientHello. ` +
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, allowSessionTicket: ${this.settings.allowSessionTicket}`
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
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`SNI value: ${extractedSNI || 'None'}, ` +
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`allowSessionTicket: ${this.settings.allowSessionTicket}`
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);
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// Block if there's session resumption without SNI
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@ -1967,9 +1975,13 @@ export class PortProxy {
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if (resumptionInfo.isResumption) {
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// Always log resumption attempt for easier debugging
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// Try to extract SNI for logging
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const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
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console.log(
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`[${connectionId}] Session resumption detected in SNI handler. ` +
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, allowSessionTicket: ${this.settings.allowSessionTicket}`
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`Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
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`SNI value: ${extractedSNI || 'None'}, ` +
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`allowSessionTicket: ${this.settings.allowSessionTicket}`
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);
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// Block if there's session resumption without SNI
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@ -413,7 +413,36 @@ export class SniHandler {
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// Check that the SNI extension actually has content
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if (extensionLength > 0) {
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hasSNI = true;
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// Try to extract the actual SNI value for logging
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try {
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// Skip to server_name_list_length (2 bytes)
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const tempPos = pos;
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if (tempPos + 2 <= extensionsEnd) {
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const nameListLength = (buffer[tempPos] << 8) + buffer[tempPos + 1];
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// Skip server_name_list_length (2 bytes)
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if (tempPos + 2 + 1 <= extensionsEnd) {
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// Check name_type (should be 0 for hostname)
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if (buffer[tempPos + 2] === 0) {
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// Skip name_type (1 byte)
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if (tempPos + 3 + 2 <= extensionsEnd) {
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// Get name_length (2 bytes)
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const nameLength = (buffer[tempPos + 3] << 8) + buffer[tempPos + 4];
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// Extract the hostname
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if (tempPos + 5 + nameLength <= extensionsEnd) {
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const hostname = buffer.slice(tempPos + 5, tempPos + 5 + nameLength).toString('utf8');
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log(`Found SNI extension with server_name: ${hostname}`);
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}
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}
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}
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}
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}
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} catch (e) {
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log(`Error extracting SNI value: ${e}`);
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log('Found SNI extension with length: ' + extensionLength);
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}
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} else {
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log('Found empty SNI extension, treating as no SNI');
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}
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