src: add .code and SSL specific error properties

SSL errors have a long structured message, but lacked the standard .code property which can be used for stable comparisons. Add a `code` property, as well as the 3 string components of an SSL error: `reason`, `library`, and `function`. PR-URL: #25093 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
nodejs · sam-github · Nov 20, 2018 · Mar 28, 2019 · Mar 28, 2019 · Mar 28, 2019
commit 24dbb965c00f984ce90f0aa7b062966e34463bc3
diff --git a/src/env.h b/src/env.h
@@ -185,6 +185,7 @@ constexpr size_t kFsStatsBufferLength = kFsStatsFieldsNumber * 2;
   V(fingerprint_string, "fingerprint")                                         \
   V(flags_string, "flags")                                                     \
   V(fragment_string, "fragment")                                               \
+  V(function_string, "function")                                               \
   V(get_data_clone_error_string, "_getDataCloneError")                         \
   V(get_shared_array_buffer_id_string, "_getSharedArrayBufferId")              \
   V(gid_string, "gid")                                                         \
@@ -208,6 +209,7 @@ constexpr size_t kFsStatsBufferLength = kFsStatsFieldsNumber * 2;
   V(issuercert_string, "issuerCertificate")                                    \
   V(kill_signal_string, "killSignal")                                          \
   V(kind_string, "kind")                                                       \
+  V(library_string, "library")                                                 \
   V(mac_string, "mac")                                                         \
   V(main_string, "main")                                                       \
   V(max_buffer_string, "maxBuffer")                                            \
@@ -318,7 +320,7 @@ constexpr size_t kFsStatsBufferLength = kFsStatsFieldsNumber * 2;
   V(write_host_object_string, "_writeHostObject")                              \
   V(write_queue_size_string, "writeQueueSize")                                 \
   V(x_forwarded_string, "x-forwarded-for")                                     \
-  V(zero_return_string, "ZERO_RETURN")
+  V(zero_return_string, "ZERO_RETURN")                                         \
 
 #define ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES(V)                            \
   V(as_callback_data, v8::Object)                                              \

diff --git a/src/tls_wrap.cc b/src/tls_wrap.cc
@@ -40,6 +40,7 @@ using v8::Exception;
 using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
+using v8::Isolate;
 using v8::Local;
 using v8::Object;
 using v8::ReadOnly;
@@ -367,9 +368,43 @@ Local<Value> TLSWrap::GetSSLError(int status, int* err, std::string* msg) {
         BUF_MEM* mem;
         BIO_get_mem_ptr(bio, &mem);
 
+        Isolate* isolate = env()->isolate();
+        Local<Context> context = isolate->GetCurrentContext();
+
         Local<String> message =
-            OneByteString(env()->isolate(), mem->data, mem->length);
+            OneByteString(isolate, mem->data, mem->length);
         Local<Value> exception = Exception::Error(message);
+        Local<Object> obj = exception->ToObject(context).ToLocalChecked();
+
+        const char* ls = ERR_lib_error_string(ssl_err);
+        const char* fs = ERR_func_error_string(ssl_err);
+        const char* rs = ERR_reason_error_string(ssl_err);
+
+        if (ls != nullptr)
+          obj->Set(context, env()->library_string(),
+                   OneByteString(isolate, ls)).FromJust();
+        if (fs != nullptr)
+          obj->Set(context, env()->function_string(),
+                   OneByteString(isolate, fs)).FromJust();
+        if (rs != nullptr) {
+          obj->Set(context, env()->reason_string(),
+                   OneByteString(isolate, rs)).FromJust();
+
+          // SSL has no API to recover the error name from the number, so we
+          // transform reason strings like "this error" to "ERR_SSL_THIS_ERROR",
+          // which ends up being close to the original error macro name.
+          std::string code(rs);
+
+          for (auto& c : code) {
+            if (c == ' ')
+              c = '_';
+            else
+              c = ::toupper(c);
+          }
+          obj->Set(context, env()->code_string(),
+                   OneByteString(isolate, ("ERR_SSL_" + code).c_str()))
+                     .FromJust();
+        }
 
         if (msg != nullptr)
           msg->assign(mem->data, mem->data + mem->length);

diff --git a/test/parallel/test-tls-alert-handling.js b/test/parallel/test-tls-alert-handling.js
@@ -7,6 +7,7 @@ if (!common.hasCrypto)
 if (!common.opensslCli)
   common.skip('node compiled without OpenSSL CLI');
 
+const assert = require('assert');
 const net = require('net');
 const tls = require('tls');
 const fixtures = require('../common/fixtures');
@@ -29,7 +30,11 @@ const opts = {
 const max_iter = 20;
 let iter = 0;
 
-const errorHandler = common.mustCall(() => {
+const errorHandler = common.mustCall((err) => {
+  assert.strictEqual(err.code, 'ERR_SSL_WRONG_VERSION_NUMBER');
+  assert.strictEqual(err.library, 'SSL routines');
+  assert.strictEqual(err.function, 'ssl3_get_record');
+  assert.strictEqual(err.reason, 'wrong version number');
   errorReceived = true;
   if (canCloseServer())
     server.close();
@@ -81,5 +86,10 @@ function sendBADTLSRecord() {
       socket.end(BAD_RECORD);
     });
   }));
-  client.on('error', common.mustCall());
+  client.on('error', common.mustCall((err) => {
+    assert.strictEqual(err.code, 'ERR_SSL_TLSV1_ALERT_PROTOCOL_VERSION');
+    assert.strictEqual(err.library, 'SSL routines');
+    assert.strictEqual(err.function, 'ssl3_read_bytes');
+    assert.strictEqual(err.reason, 'tlsv1 alert protocol version');
+  }));
 }