tls: avoid taking ownership of OpenSSL objects

It is often unnecessary to obtain (shared) ownership of OpenSSL objects
in this code, and it generally is more costly to do so as opposed to
just obtaining a pointer to the respective OpenSSL object. Therefore,
this patch replaces various OpenSSL function calls that take ownership
with ones that do not.

Author: tniessen

src/crypto/crypto_common.cc

@@ -21,6 +21,14 @@
 #include <string>
 #include <unordered_map>
 
+// Some OpenSSL 1.1.1 functions unnecessarily operate on and return non-const
+// pointers, whereas the same functions in OpenSSL 3 use const pointers.
+#if OPENSSL_VERSION_MAJOR >= 3
+#define OSSL3_CONST const
+#else
+#define OSSL3_CONST
+#endif
+
 namespace node {
 
 using v8::Array;
@@ -425,20 +433,15 @@ MaybeLocal<Value> GetCurveName(Environment* env, const int nid) {
       MaybeLocal<Value>(Undefined(env->isolate()));
 }
 
-MaybeLocal<Value> GetECPubKey(
-    Environment* env,
-    const EC_GROUP* group,
-    const ECPointer& ec) {
-  const EC_POINT* pubkey = EC_KEY_get0_public_key(ec.get());
+MaybeLocal<Value> GetECPubKey(Environment* env,
+                              const EC_GROUP* group,
+                              OSSL3_CONST EC_KEY* ec) {
+  const EC_POINT* pubkey = EC_KEY_get0_public_key(ec);
   if (pubkey == nullptr)
     return Undefined(env->isolate());
 
-  return ECPointToBuffer(
-      env,
-      group,
-      pubkey,
-      EC_KEY_get_conv_form(ec.get()),
-      nullptr).FromMaybe(Local<Object>());
+  return ECPointToBuffer(env, group, pubkey, EC_KEY_get_conv_form(ec), nullptr)
+      .FromMaybe(Local<Object>());
 }
 
 MaybeLocal<Value> GetECGroupBits(Environment* env, const EC_GROUP* group) {
@@ -452,8 +455,8 @@ MaybeLocal<Value> GetECGroupBits(Environment* env, const EC_GROUP* group) {
   return Integer::New(env->isolate(), bits);
 }
 
-MaybeLocal<Object> GetPubKey(Environment* env, const RSAPointer& rsa) {
-  int size = i2d_RSA_PUBKEY(rsa.get(), nullptr);
+MaybeLocal<Object> GetPubKey(Environment* env, OSSL3_CONST RSA* rsa) {
+  int size = i2d_RSA_PUBKEY(rsa, nullptr);
   CHECK_GE(size, 0);
 
   std::unique_ptr<BackingStore> bs;
@@ -463,7 +466,7 @@ MaybeLocal<Object> GetPubKey(Environment* env, const RSAPointer& rsa) {
   }
 
   unsigned char* serialized = reinterpret_cast<unsigned char*>(bs->Data());
-  CHECK_GE(i2d_RSA_PUBKEY(rsa.get(), &serialized), 0);
+  CHECK_GE(i2d_RSA_PUBKEY(rsa, &serialized), 0);
 
   Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), std::move(bs));
   return Buffer::New(env, ab, 0, ab->ByteLength()).FromMaybe(Local<Object>());
@@ -1125,8 +1128,8 @@ MaybeLocal<Object> GetEphemeralKey(Environment* env, const SSLPointer& ssl) {
       {
         const char* curve_name;
         if (kid == EVP_PKEY_EC) {
-          ECKeyPointer ec(EVP_PKEY_get1_EC_KEY(key.get()));
-          int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec.get()));
+          OSSL3_CONST EC_KEY* ec = EVP_PKEY_get0_EC_KEY(key.get());
+          int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
           curve_name = OBJ_nid2sn(nid);
         } else {
           curve_name = OBJ_nid2sn(kid);
@@ -1285,24 +1288,24 @@ MaybeLocal<Object> X509ToObject(
     return MaybeLocal<Object>();
   }
 
-  EVPKeyPointer pkey(X509_get_pubkey(cert));
-  RSAPointer rsa;
-  ECPointer ec;
-  if (pkey) {
-    switch (EVP_PKEY_id(pkey.get())) {
+  OSSL3_CONST EVP_PKEY* pkey = X509_get0_pubkey(cert);
+  OSSL3_CONST RSA* rsa = nullptr;
+  OSSL3_CONST EC_KEY* ec = nullptr;
+  if (pkey != nullptr) {
+    switch (EVP_PKEY_id(pkey)) {
       case EVP_PKEY_RSA:
-        rsa.reset(EVP_PKEY_get1_RSA(pkey.get()));
+        rsa = EVP_PKEY_get0_RSA(pkey);
         break;
       case EVP_PKEY_EC:
-        ec.reset(EVP_PKEY_get1_EC_KEY(pkey.get()));
+        ec = EVP_PKEY_get0_EC_KEY(pkey);
         break;
     }
   }
 
   if (rsa) {
     const BIGNUM* n;
     const BIGNUM* e;
-    RSA_get0_key(rsa.get(), &n, &e, nullptr);
+    RSA_get0_key(rsa, &n, &e, nullptr);
     if (!Set<Value>(context,
                     info,
                     env->modulus_string(),
@@ -1319,7 +1322,7 @@ MaybeLocal<Object> X509ToObject(
       return MaybeLocal<Object>();
     }
   } else if (ec) {
-    const EC_GROUP* group = EC_KEY_get0_group(ec.get());
+    const EC_GROUP* group = EC_KEY_get0_group(ec);
 
     if (!Set<Value>(
             context, info, env->bits_string(), GetECGroupBits(env, group)) ||
@@ -1348,11 +1351,6 @@ MaybeLocal<Object> X509ToObject(
     }
   }
 
-  // pkey, rsa, and ec pointers are no longer needed.
-  pkey.reset();
-  rsa.reset();
-  ec.reset();
-
   if (!Set<Value>(context,
                   info,
                   env->valid_from_string(),