tls: emit errors on close whilst async action

When loading session, OCSP response, SNI, always check that the
`self._handle` is present. If it is not - the socket was closed - and we
should emit the error instead of throwing an uncaught exception.

Fix: nodejs/node-v0.x-archive#8780
Fix: nodejs#1696

Author: indutny

lib/_tls_wrap.js

@@ -61,6 +61,9 @@ function loadSession(self, hello, cb) {
     if (err)
       return cb(err);
 
+    if (!self._handle)
+      return cb(new Error('Socket is closed'));
+
     // NOTE: That we have disabled OpenSSL's internal session storage in
     // `node_crypto.cc` and hence its safe to rely on getting servername only
     // from clienthello or this place.
@@ -91,6 +94,9 @@ function loadSNI(self, servername, cb) {
     if (err)
       return cb(err);
 
+    if (!self._handle)
+      return cb(new Error('Socket is closed'));
+
     // TODO(indutny): eventually disallow raw `SecureContext`
     if (context)
       self._handle.sni_context = context.context || context;
@@ -127,6 +133,9 @@ function requestOCSP(self, hello, ctx, cb) {
     if (err)
       return cb(err);
 
+    if (!self._handle)
+      return cb(new Error('Socket is closed'));
+
     if (response)
       self._handle.setOCSPResponse(response);
     cb(null);
@@ -157,6 +166,9 @@ function oncertcb(info) {
       if (err)
         return self.destroy(err);
 
+      if (!self._handle)
+        return cb(new Error('Socket is closed'));
+
       self._handle.certCbDone();
     });
   });
@@ -179,6 +191,9 @@ function onnewsession(key, session) {
       return;
     once = true;
 
+    if (!self._handle)
+      return cb(new Error('Socket is closed'));
+
     self._handle.newSessionDone();
 
     self._newSessionPending = false;

test/parallel/test-tls-async-cb-after-socket-end.js

@@ -0,0 +1,71 @@
+var common = require('../common');
+
+var assert = require('assert');
+var path = require('path');
+var fs = require('fs');
+var constants = require('constants');
+
+if (!common.hasCrypto) {
+  console.log('1..0 # Skipped: missing crypto');
+  process.exit();
+}
+
+var tls = require('tls');
+
+var options = {
+  secureOptions: constants.SSL_OP_NO_TICKET,
+  key: fs.readFileSync(path.join(common.fixturesDir, 'test_key.pem')),
+  cert: fs.readFileSync(path.join(common.fixturesDir, 'test_cert.pem'))
+};
+
+var server = tls.createServer(options, function(c) {
+});
+
+var sessionCb = null;
+var client = null;
+
+server.on('newSession', function(key, session, done) {
+  done();
+});
+
+server.on('resumeSession', function(id, cb) {
+  sessionCb = cb;
+
+  next();
+});
+
+server.listen(1443, function() {
+  var clientOpts = {
+    port: 1443,
+    rejectUnauthorized: false,
+    session: false
+  };
+
+  var s1 = tls.connect(clientOpts, function() {
+    clientOpts.session = s1.getSession();
+    console.log('1st secure');
+
+    s1.destroy();
+    var s2 = tls.connect(clientOpts, function(s) {
+      console.log('2nd secure');
+
+      s2.destroy();
+    }).on('connect', function() {
+      console.log('2nd connected');
+      client = s2;
+
+      next();
+    });
+  });
+})
+
+function next() {
+  if (!client || !sessionCb)
+    return;
+
+  client.destroy();
+  setTimeout(function() {
+    sessionCb();
+    server.close();
+  }, 100);
+}