tls: permit null as a pfx value

Allow null along with undefined for pfx value.

This is to avoid breaking change when upgrading v14 to v16 and
3rd party library passing null to pfx

Fixes: #36292

PR-URL: #41170
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>

Author: CallMeLaNN

lib/internal/tls/secure-context.js

@@ -83,7 +83,7 @@ function validateKeyOrCertOption(name, value) {
 
 function setKey(context, key, passphrase, name) {
   validateKeyOrCertOption(`${name}.key`, key);
-  if (passphrase != null)
+  if (passphrase !== undefined && passphrase !== null)
     validateString(passphrase, `${name}.passphrase`);
   context.setKey(key, passphrase);
 }
@@ -160,16 +160,20 @@ function configSecureContext(context, options = {}, name = 'options') {
     if (ArrayIsArray(key)) {
       for (let i = 0; i < key.length; ++i) {
         const val = key[i];
-        // eslint-disable-next-line eqeqeq
-        const pem = (val != undefined && val.pem !== undefined ? val.pem : val);
-        setKey(context, pem, val.passphrase || passphrase, name);
+        const pem = (
+          val !== undefined && val !== null &&
+          val.pem !== undefined ? val.pem : val);
+        const pass = (
+          val !== undefined && val !== null &&
+          val.passphrase !== undefined ? val.passphrase : passphrase);
+        setKey(context, pem, pass, name);
       }
     } else {
       setKey(context, key, passphrase, name);
     }
   }
 
-  if (sigalgs !== undefined) {
+  if (sigalgs !== undefined && sigalgs !== null) {
     validateString(sigalgs, `${name}.sigalgs`);
 
     if (sigalgs === '')
@@ -178,8 +182,8 @@ function configSecureContext(context, options = {}, name = 'options') {
     context.setSigalgs(sigalgs);
   }
 
-  if (privateKeyIdentifier !== undefined) {
-    if (privateKeyEngine === undefined) {
+  if (privateKeyIdentifier !== undefined && privateKeyIdentifier !== null) {
+    if (privateKeyEngine === undefined || privateKeyEngine === null) {
       // Engine is required when privateKeyIdentifier is present
       throw new ERR_INVALID_ARG_VALUE(`${name}.privateKeyEngine`,
                                       privateKeyEngine);
@@ -198,16 +202,16 @@ function configSecureContext(context, options = {}, name = 'options') {
         throw new ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED();
     } else if (typeof privateKeyIdentifier !== 'string') {
       throw new ERR_INVALID_ARG_TYPE(`${name}.privateKeyIdentifier`,
-                                     ['string', 'undefined'],
+                                     ['string', 'null', 'undefined'],
                                      privateKeyIdentifier);
     } else {
       throw new ERR_INVALID_ARG_TYPE(`${name}.privateKeyEngine`,
-                                     ['string', 'undefined'],
+                                     ['string', 'null', 'undefined'],
                                      privateKeyEngine);
     }
   }
 
-  if (ciphers != null)
+  if (ciphers !== undefined && ciphers !== null)
     validateString(ciphers, `${name}.ciphers`);
 
   // Work around an OpenSSL API quirk. cipherList is for TLSv1.2 and below,
@@ -237,14 +241,14 @@ function configSecureContext(context, options = {}, name = 'options') {
   validateString(ecdhCurve, `${name}.ecdhCurve`);
   context.setECDHCurve(ecdhCurve);
 
-  if (dhparam !== undefined) {
+  if (dhparam !== undefined && dhparam !== null) {
     validateKeyOrCertOption(`${name}.dhparam`, dhparam);
     const warning = context.setDHParam(dhparam);
     if (warning)
       process.emitWarning(warning, 'SecurityWarning');
   }
 
-  if (crl !== undefined) {
+  if (crl !== undefined && crl !== null) {
     if (ArrayIsArray(crl)) {
       for (const val of crl) {
         validateKeyOrCertOption(`${name}.crl`, val);
@@ -256,17 +260,17 @@ function configSecureContext(context, options = {}, name = 'options') {
     }
   }
 
-  if (sessionIdContext !== undefined) {
+  if (sessionIdContext !== undefined && sessionIdContext !== null) {
     validateString(sessionIdContext, `${name}.sessionIdContext`);
     context.setSessionIdContext(sessionIdContext);
   }
 
-  if (pfx !== undefined) {
+  if (pfx !== undefined && pfx !== null) {
     if (ArrayIsArray(pfx)) {
       ArrayPrototypeForEach(pfx, (val) => {
         const raw = val.buf ? val.buf : val;
         const pass = val.passphrase || passphrase;
-        if (pass !== undefined) {
+        if (pass !== undefined && pass !== null) {
           context.loadPKCS12(toBuf(raw), toBuf(pass));
         } else {
           context.loadPKCS12(toBuf(raw));
@@ -284,13 +288,13 @@ function configSecureContext(context, options = {}, name = 'options') {
       throw new ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED();
     else
       context.setClientCertEngine(clientCertEngine);
-  } else if (clientCertEngine !== undefined) {
+  } else if (clientCertEngine !== undefined && clientCertEngine !== null) {
     throw new ERR_INVALID_ARG_TYPE(`${name}.clientCertEngine`,
                                    ['string', 'null', 'undefined'],
                                    clientCertEngine);
   }
 
-  if (ticketKeys !== undefined) {
+  if (ticketKeys !== undefined && ticketKeys !== null) {
     if (!isArrayBufferView(ticketKeys)) {
       throw new ERR_INVALID_ARG_TYPE(
         `${name}.ticketKeys`,
@@ -306,7 +310,7 @@ function configSecureContext(context, options = {}, name = 'options') {
     context.setTicketKeys(ticketKeys);
   }
 
-  if (sessionTimeout !== undefined) {
+  if (sessionTimeout !== undefined && sessionTimeout !== null) {
     validateInt32(sessionTimeout, `${name}.sessionTimeout`);
     context.setSessionTimeout(sessionTimeout);
   }

test/parallel/test-tls-connect-secure-context.js

@@ -23,3 +23,31 @@ connect({
   assert.ifError(err);
   return cleanup();
 });
+
+connect({
+  client: {
+    servername: 'agent1',
+    secureContext: tls.createSecureContext({
+      ca: keys.agent1.ca,
+      ciphers: null,
+      clientCertEngine: null,
+      crl: null,
+      dhparam: null,
+      passphrase: null,
+      pfx: null,
+      privateKeyIdentifier: null,
+      privateKeyEngine: null,
+      sessionIdContext: null,
+      sessionTimeout: null,
+      sigalgs: null,
+      ticketKeys: null,
+    }),
+  },
+  server: {
+    cert: keys.agent1.cert,
+    key: keys.agent1.key,
+  },
+}, function(err, pair, cleanup) {
+  assert.ifError(err);
+  return cleanup();
+});