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fix(tls/sni): Improve logging for TLS session resumption by extracting and logging SNI values from ClientHello messages.

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This commit is contained in:
Philipp Kunz
2025-03-12 10:01:54 +00:00
parent 156abbf5b4
commit ab1ec84832
4 changed files with 52 additions and 5 deletions
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31
ts/classes.snihandler.ts
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@ -413,7 +413,36 @@ export class SniHandler {
// Check that the SNI extension actually has content
if (extensionLength > 0) {
hasSNI = true;
log('Found SNI extension with length: ' + extensionLength);
// 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');
}