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crypto: Fix malloc mixing in X509ToObject #25717

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crypto: Fix malloc mixing in X509ToObject #25717

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9110ab3
crypto: fix malloc mixing in X509ToObject
davidben Jan 25, 2019
eb7748b
Use MaybeLocal::ToLocal and don't crash X509ToObject on error.
davidben Jan 29, 2019
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Use MaybeLocal::ToLocal and don't crash X509ToObject on error.
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@davidben
davidben committed Jan 29, 2019
commit eb7748b46c6590126a8b5c0bef63f6800359bb30
36 changes: 22 additions & 14 deletions src/node_crypto.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1628,24 +1628,27 @@ static void AddFingerprintDigest(const unsigned char* md,
}
}


static MaybeLocal<Object> ECPointToBuffer(Environment* env,
const EC_GROUP* group,
const EC_POINT* point,
point_conversion_form_t form) {
point_conversion_form_t form,
const char** error) {
size_t len = EC_POINT_point2oct(group, point, form, nullptr, 0, nullptr);
if (len == 0) {
env->ThrowError("Failed to get public key length");
if (error != nullptr) *error = "Failed to get public key length";
return MaybeLocal<Object>();
}
MallocedBuffer<unsigned char> buf(len);
len = EC_POINT_point2oct(group, point, form, buf.data, buf.size, nullptr);
if (len == 0) {
env->ThrowError("Failed to get public key");
if (error != nullptr) *error = "Failed to get public key";
return MaybeLocal<Object>();
}
return Buffer::New(env, buf.release(), len);
}


static Local<Object> X509ToObject(Environment* env, X509* cert) {
EscapableHandleScope scope(env->isolate());
Local<Context> context = env->context();
Expand Down Expand Up @@ -1763,10 +1766,11 @@ static Local<Object> X509ToObject(Environment* env, X509* cert) {
}

const EC_POINT* pubkey = EC_KEY_get0_public_key(ec.get());
if (pubkey != nullptr) {
Local<Object> buf =
ECPointToBuffer(env, group, pubkey, EC_KEY_get_conv_form(ec.get()))
.ToLocalChecked();
Local<Object> buf;
if (pubkey != nullptr &&
ECPointToBuffer(
env, group, pubkey, EC_KEY_get_conv_form(ec.get()), nullptr)
.ToLocal(&buf)) {
info->Set(context, env->pubkey_string(), buf).FromJust();
}

Expand Down Expand Up @@ -5266,6 +5270,7 @@ void ECDH::GetPublicKey(const FunctionCallbackInfo<Value>& args) {
ECDH* ecdh;
ASSIGN_OR_RETURN_UNWRAP(&ecdh, args.Holder());

const EC_GROUP* group = EC_KEY_get0_group(ecdh->key_.get());
const EC_POINT* pub = EC_KEY_get0_public_key(ecdh->key_.get());
if (pub == nullptr)
return env->ThrowError("Failed to get ECDH public key");
Expand All @@ -5274,10 +5279,11 @@ void ECDH::GetPublicKey(const FunctionCallbackInfo<Value>& args) {
uint32_t val = args[0].As<Uint32>()->Value();
point_conversion_form_t form = static_cast<point_conversion_form_t>(val);

MaybeLocal<Object> buf =
ECPointToBuffer(env, EC_KEY_get0_group(ecdh->key_.get()), pub, form);
if (buf.IsEmpty()) return;
args.GetReturnValue().Set(buf.ToLocalChecked());
const char* error;
Local<Object> buf;
if (!ECPointToBuffer(env, group, pub, form, &error).ToLocal(&buf))
return env->ThrowError(error);
args.GetReturnValue().Set(buf);
}


Expand Down Expand Up @@ -6167,9 +6173,11 @@ void ConvertKey(const FunctionCallbackInfo<Value>& args) {
uint32_t val = args[2].As<Uint32>()->Value();
point_conversion_form_t form = static_cast<point_conversion_form_t>(val);

MaybeLocal<Object> buf = ECPointToBuffer(env, group.get(), pub.get(), form);
if (buf.IsEmpty()) return;
args.GetReturnValue().Set(buf.ToLocalChecked());
const char* error;
Local<Object> buf;
if (!ECPointToBuffer(env, group.get(), pub.get(), form, &error).ToLocal(&buf))
return env->ThrowError(error);
args.GetReturnValue().Set(buf);
}


Expand Down