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|
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "tls_wrap.h"
#include "async_wrap-inl.h"
#include "debug_utils-inl.h"
#include "memory_tracker-inl.h"
#include "node_buffer.h" // Buffer
#include "node_crypto.h" // SecureContext
#include "node_crypto_bio.h" // NodeBIO
// ClientHelloParser
#include "node_crypto_clienthello-inl.h"
#include "node_errors.h"
#include "stream_base-inl.h"
#include "util-inl.h"
namespace node {
using crypto::SecureContext;
using crypto::SSLWrap;
using v8::Context;
using v8::DontDelete;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::PropertyAttribute;
using v8::ReadOnly;
using v8::Signature;
using v8::String;
using v8::Value;
TLSWrap::TLSWrap(Environment* env,
Local<Object> obj,
Kind kind,
StreamBase* stream,
SecureContext* sc)
: AsyncWrap(env, obj, AsyncWrap::PROVIDER_TLSWRAP),
SSLWrap<TLSWrap>(env, sc, kind),
StreamBase(env),
sc_(sc) {
MakeWeak();
StreamBase::AttachToObject(GetObject());
// sc comes from an Unwrap. Make sure it was assigned.
CHECK_NOT_NULL(sc);
// We've our own session callbacks
SSL_CTX_sess_set_get_cb(sc_->ctx_.get(),
SSLWrap<TLSWrap>::GetSessionCallback);
SSL_CTX_sess_set_new_cb(sc_->ctx_.get(),
SSLWrap<TLSWrap>::NewSessionCallback);
stream->PushStreamListener(this);
InitSSL();
Debug(this, "Created new TLSWrap");
}
TLSWrap::~TLSWrap() {
Debug(this, "~TLSWrap()");
sc_ = nullptr;
}
bool TLSWrap::InvokeQueued(int status, const char* error_str) {
Debug(this, "InvokeQueued(%d, %s)", status, error_str);
if (!write_callback_scheduled_)
return false;
if (current_write_ != nullptr) {
WriteWrap* w = current_write_;
current_write_ = nullptr;
w->Done(status, error_str);
}
return true;
}
void TLSWrap::NewSessionDoneCb() {
Debug(this, "NewSessionDoneCb()");
Cycle();
}
void TLSWrap::InitSSL() {
// Initialize SSL – OpenSSL takes ownership of these.
enc_in_ = crypto::NodeBIO::New(env()).release();
enc_out_ = crypto::NodeBIO::New(env()).release();
SSL_set_bio(ssl_.get(), enc_in_, enc_out_);
// NOTE: This could be overridden in SetVerifyMode
SSL_set_verify(ssl_.get(), SSL_VERIFY_NONE, crypto::VerifyCallback);
#ifdef SSL_MODE_RELEASE_BUFFERS
SSL_set_mode(ssl_.get(), SSL_MODE_RELEASE_BUFFERS);
#endif // SSL_MODE_RELEASE_BUFFERS
// This is default in 1.1.1, but set it anyway, Cycle() doesn't currently
// re-call ClearIn() if SSL_read() returns SSL_ERROR_WANT_READ, so data can be
// left sitting in the incoming enc_in_ and never get processed.
// - https://wiki.openssl.org/index.php/TLS1.3#Non-application_data_records
SSL_set_mode(ssl_.get(), SSL_MODE_AUTO_RETRY);
SSL_set_app_data(ssl_.get(), this);
// Using InfoCallback isn't how we are supposed to check handshake progress:
// https://github.com/openssl/openssl/issues/7199#issuecomment-420915993
//
// Note on when this gets called on various openssl versions:
// https://github.com/openssl/openssl/issues/7199#issuecomment-420670544
SSL_set_info_callback(ssl_.get(), SSLInfoCallback);
if (is_server()) {
SSL_CTX_set_tlsext_servername_callback(sc_->ctx_.get(),
SelectSNIContextCallback);
}
ConfigureSecureContext(sc_);
SSL_set_cert_cb(ssl_.get(), SSLWrap<TLSWrap>::SSLCertCallback, this);
if (is_server()) {
SSL_set_accept_state(ssl_.get());
} else if (is_client()) {
// Enough space for server response (hello, cert)
crypto::NodeBIO::FromBIO(enc_in_)->set_initial(kInitialClientBufferLength);
SSL_set_connect_state(ssl_.get());
} else {
// Unexpected
ABORT();
}
}
void TLSWrap::Wrap(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_EQ(args.Length(), 3);
CHECK(args[0]->IsObject());
CHECK(args[1]->IsObject());
CHECK(args[2]->IsBoolean());
Local<Object> sc = args[1].As<Object>();
Kind kind = args[2]->IsTrue() ? SSLWrap<TLSWrap>::kServer :
SSLWrap<TLSWrap>::kClient;
StreamBase* stream = StreamBase::FromObject(args[0].As<Object>());
CHECK_NOT_NULL(stream);
Local<Object> obj;
if (!env->tls_wrap_constructor_function()
->NewInstance(env->context())
.ToLocal(&obj)) {
return;
}
TLSWrap* res = new TLSWrap(env, obj, kind, stream, Unwrap<SecureContext>(sc));
args.GetReturnValue().Set(res->object());
}
void TLSWrap::Receive(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
ArrayBufferViewContents<char> buffer(args[0]);
const char* data = buffer.data();
size_t len = buffer.length();
Debug(wrap, "Receiving %zu bytes injected from JS", len);
// Copy given buffer entirely or partiall if handle becomes closed
while (len > 0 && wrap->IsAlive() && !wrap->IsClosing()) {
uv_buf_t buf = wrap->OnStreamAlloc(len);
size_t copy = buf.len > len ? len : buf.len;
memcpy(buf.base, data, copy);
buf.len = copy;
wrap->OnStreamRead(copy, buf);
data += copy;
len -= copy;
}
}
void TLSWrap::Start(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK(!wrap->started_);
wrap->started_ = true;
// Send ClientHello handshake
CHECK(wrap->is_client());
// Seems odd to read when when we want to send, but SSL_read() triggers a
// handshake if a session isn't established, and handshake will cause
// encrypted data to become available for output.
wrap->ClearOut();
wrap->EncOut();
}
void TLSWrap::SSLInfoCallback(const SSL* ssl_, int where, int ret) {
if (!(where & (SSL_CB_HANDSHAKE_START | SSL_CB_HANDSHAKE_DONE)))
return;
// SSL_renegotiate_pending() should take `const SSL*`, but it does not.
SSL* ssl = const_cast<SSL*>(ssl_);
TLSWrap* c = static_cast<TLSWrap*>(SSL_get_app_data(ssl_));
Environment* env = c->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Object> object = c->object();
if (where & SSL_CB_HANDSHAKE_START) {
Debug(c, "SSLInfoCallback(SSL_CB_HANDSHAKE_START);");
// Start is tracked to limit number and frequency of renegotiation attempts,
// since excessive renegotiation may be an attack.
Local<Value> callback;
if (object->Get(env->context(), env->onhandshakestart_string())
.ToLocal(&callback) && callback->IsFunction()) {
Local<Value> argv[] = { env->GetNow() };
c->MakeCallback(callback.As<Function>(), arraysize(argv), argv);
}
}
// SSL_CB_HANDSHAKE_START and SSL_CB_HANDSHAKE_DONE are called
// sending HelloRequest in OpenSSL-1.1.1.
// We need to check whether this is in a renegotiation state or not.
if (where & SSL_CB_HANDSHAKE_DONE && !SSL_renegotiate_pending(ssl)) {
Debug(c, "SSLInfoCallback(SSL_CB_HANDSHAKE_DONE);");
CHECK(!SSL_renegotiate_pending(ssl));
Local<Value> callback;
c->established_ = true;
if (object->Get(env->context(), env->onhandshakedone_string())
.ToLocal(&callback) && callback->IsFunction()) {
c->MakeCallback(callback.As<Function>(), 0, nullptr);
}
}
}
void TLSWrap::EncOut() {
Debug(this, "Trying to write encrypted output");
// Ignore cycling data if ClientHello wasn't yet parsed
if (!hello_parser_.IsEnded()) {
Debug(this, "Returning from EncOut(), hello_parser_ active");
return;
}
// Write in progress
if (write_size_ != 0) {
Debug(this, "Returning from EncOut(), write currently in progress");
return;
}
// Wait for `newSession` callback to be invoked
if (is_awaiting_new_session()) {
Debug(this, "Returning from EncOut(), awaiting new session");
return;
}
// Split-off queue
if (established_ && current_write_ != nullptr) {
Debug(this, "EncOut() setting write_callback_scheduled_");
write_callback_scheduled_ = true;
}
if (ssl_ == nullptr) {
Debug(this, "Returning from EncOut(), ssl_ == nullptr");
return;
}
// No encrypted output ready to write to the underlying stream.
if (BIO_pending(enc_out_) == 0) {
Debug(this, "No pending encrypted output");
if (pending_cleartext_input_.size() == 0) {
if (!in_dowrite_) {
Debug(this, "No pending cleartext input, not inside DoWrite()");
InvokeQueued(0);
} else {
Debug(this, "No pending cleartext input, inside DoWrite()");
// TODO(@sam-github, @addaleax) If in_dowrite_ is true, appdata was
// passed to SSL_write(). If we are here, the data was not encrypted to
// enc_out_ yet. Calling Done() "works", but since the write is not
// flushed, its too soon. Just returning and letting the next EncOut()
// call Done() passes the test suite, but without more careful analysis,
// its not clear if it is always correct. Not calling Done() could block
// data flow, so for now continue to call Done(), just do it in the next
// tick.
BaseObjectPtr<TLSWrap> strong_ref{this};
env()->SetImmediate([this, strong_ref](Environment* env) {
InvokeQueued(0);
});
}
}
return;
}
char* data[kSimultaneousBufferCount];
size_t size[arraysize(data)];
size_t count = arraysize(data);
write_size_ = crypto::NodeBIO::FromBIO(enc_out_)->PeekMultiple(data,
size,
&count);
CHECK(write_size_ != 0 && count != 0);
uv_buf_t buf[arraysize(data)];
uv_buf_t* bufs = buf;
for (size_t i = 0; i < count; i++)
buf[i] = uv_buf_init(data[i], size[i]);
Debug(this, "Writing %zu buffers to the underlying stream", count);
StreamWriteResult res = underlying_stream()->Write(bufs, count);
if (res.err != 0) {
InvokeQueued(res.err);
return;
}
if (!res.async) {
Debug(this, "Write finished synchronously");
HandleScope handle_scope(env()->isolate());
// Simulate asynchronous finishing, TLS cannot handle this at the moment.
BaseObjectPtr<TLSWrap> strong_ref{this};
env()->SetImmediate([this, strong_ref](Environment* env) {
OnStreamAfterWrite(nullptr, 0);
});
}
}
void TLSWrap::OnStreamAfterWrite(WriteWrap* req_wrap, int status) {
Debug(this, "OnStreamAfterWrite(status = %d)", status);
if (current_empty_write_ != nullptr) {
Debug(this, "Had empty write");
WriteWrap* finishing = current_empty_write_;
current_empty_write_ = nullptr;
finishing->Done(status);
return;
}
if (ssl_ == nullptr) {
Debug(this, "ssl_ == nullptr, marking as cancelled");
status = UV_ECANCELED;
}
// Handle error
if (status) {
if (shutdown_) {
Debug(this, "Ignoring error after shutdown");
return;
}
// Notify about error
InvokeQueued(status);
return;
}
// Commit
crypto::NodeBIO::FromBIO(enc_out_)->Read(nullptr, write_size_);
// Ensure that the progress will be made and `InvokeQueued` will be called.
ClearIn();
// Try writing more data
write_size_ = 0;
EncOut();
}
Local<Value> TLSWrap::GetSSLError(int status, int* err, std::string* msg) {
EscapableHandleScope scope(env()->isolate());
// ssl_ is already destroyed in reading EOF by close notify alert.
if (ssl_ == nullptr)
return Local<Value>();
*err = SSL_get_error(ssl_.get(), status);
switch (*err) {
case SSL_ERROR_NONE:
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_X509_LOOKUP:
return Local<Value>();
case SSL_ERROR_ZERO_RETURN:
return scope.Escape(env()->zero_return_string());
case SSL_ERROR_SSL:
case SSL_ERROR_SYSCALL:
{
unsigned long ssl_err = ERR_peek_error(); // NOLINT(runtime/int)
BIO* bio = BIO_new(BIO_s_mem());
ERR_print_errors(bio);
BUF_MEM* mem;
BIO_get_mem_ptr(bio, &mem);
Isolate* isolate = env()->isolate();
Local<Context> context = isolate->GetCurrentContext();
Local<String> message =
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)).Check();
if (fs != nullptr)
obj->Set(context, env()->function_string(),
OneByteString(isolate, fs)).Check();
if (rs != nullptr) {
obj->Set(context, env()->reason_string(),
OneByteString(isolate, rs)).Check();
// 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()))
.Check();
}
if (msg != nullptr)
msg->assign(mem->data, mem->data + mem->length);
BIO_free_all(bio);
return scope.Escape(exception);
}
default:
UNREACHABLE();
}
UNREACHABLE();
}
void TLSWrap::ClearOut() {
Debug(this, "Trying to read cleartext output");
// Ignore cycling data if ClientHello wasn't yet parsed
if (!hello_parser_.IsEnded()) {
Debug(this, "Returning from ClearOut(), hello_parser_ active");
return;
}
// No reads after EOF
if (eof_) {
Debug(this, "Returning from ClearOut(), EOF reached");
return;
}
if (ssl_ == nullptr) {
Debug(this, "Returning from ClearOut(), ssl_ == nullptr");
return;
}
crypto::MarkPopErrorOnReturn mark_pop_error_on_return;
char out[kClearOutChunkSize];
int read;
for (;;) {
read = SSL_read(ssl_.get(), out, sizeof(out));
Debug(this, "Read %d bytes of cleartext output", read);
if (read <= 0)
break;
char* current = out;
while (read > 0) {
int avail = read;
uv_buf_t buf = EmitAlloc(avail);
if (static_cast<int>(buf.len) < avail)
avail = buf.len;
memcpy(buf.base, current, avail);
EmitRead(avail, buf);
// Caveat emptor: OnRead() calls into JS land which can result in
// the SSL context object being destroyed. We have to carefully
// check that ssl_ != nullptr afterwards.
if (ssl_ == nullptr) {
Debug(this, "Returning from read loop, ssl_ == nullptr");
return;
}
read -= avail;
current += avail;
}
}
int flags = SSL_get_shutdown(ssl_.get());
if (!eof_ && flags & SSL_RECEIVED_SHUTDOWN) {
eof_ = true;
EmitRead(UV_EOF);
}
// We need to check whether an error occurred or the connection was
// shutdown cleanly (SSL_ERROR_ZERO_RETURN) even when read == 0.
// See node#1642 and SSL_read(3SSL) for details.
if (read <= 0) {
HandleScope handle_scope(env()->isolate());
int err;
Local<Value> arg = GetSSLError(read, &err, nullptr);
// Ignore ZERO_RETURN after EOF, it is basically not a error
if (err == SSL_ERROR_ZERO_RETURN && eof_)
return;
if (!arg.IsEmpty()) {
Debug(this, "Got SSL error (%d), calling onerror", err);
// When TLS Alert are stored in wbio,
// it should be flushed to socket before destroyed.
if (BIO_pending(enc_out_) != 0)
EncOut();
MakeCallback(env()->onerror_string(), 1, &arg);
}
}
}
void TLSWrap::ClearIn() {
Debug(this, "Trying to write cleartext input");
// Ignore cycling data if ClientHello wasn't yet parsed
if (!hello_parser_.IsEnded()) {
Debug(this, "Returning from ClearIn(), hello_parser_ active");
return;
}
if (ssl_ == nullptr) {
Debug(this, "Returning from ClearIn(), ssl_ == nullptr");
return;
}
if (pending_cleartext_input_.size() == 0) {
Debug(this, "Returning from ClearIn(), no pending data");
return;
}
AllocatedBuffer data = std::move(pending_cleartext_input_);
crypto::MarkPopErrorOnReturn mark_pop_error_on_return;
crypto::NodeBIO::FromBIO(enc_out_)->set_allocate_tls_hint(data.size());
int written = SSL_write(ssl_.get(), data.data(), data.size());
Debug(this, "Writing %zu bytes, written = %d", data.size(), written);
CHECK(written == -1 || written == static_cast<int>(data.size()));
// All written
if (written != -1) {
Debug(this, "Successfully wrote all data to SSL");
return;
}
// Error or partial write
HandleScope handle_scope(env()->isolate());
Context::Scope context_scope(env()->context());
int err;
std::string error_str;
Local<Value> arg = GetSSLError(written, &err, &error_str);
if (!arg.IsEmpty()) {
Debug(this, "Got SSL error (%d)", err);
write_callback_scheduled_ = true;
// TODO(@sam-github) Should forward an error object with
// .code/.function/.etc, if possible.
InvokeQueued(UV_EPROTO, error_str.c_str());
} else {
Debug(this, "Pushing data back");
// Push back the not-yet-written data. This can be skipped in the error
// case because no further writes would succeed anyway.
pending_cleartext_input_ = std::move(data);
}
}
std::string TLSWrap::diagnostic_name() const {
std::string name = "TLSWrap ";
if (is_server())
name += "server (";
else
name += "client (";
name += std::to_string(static_cast<int64_t>(get_async_id())) + ")";
return name;
}
AsyncWrap* TLSWrap::GetAsyncWrap() {
return static_cast<AsyncWrap*>(this);
}
bool TLSWrap::IsIPCPipe() {
return underlying_stream()->IsIPCPipe();
}
int TLSWrap::GetFD() {
return underlying_stream()->GetFD();
}
bool TLSWrap::IsAlive() {
return ssl_ != nullptr &&
stream_ != nullptr &&
underlying_stream()->IsAlive();
}
bool TLSWrap::IsClosing() {
return underlying_stream()->IsClosing();
}
int TLSWrap::ReadStart() {
Debug(this, "ReadStart()");
if (stream_ != nullptr)
return stream_->ReadStart();
return 0;
}
int TLSWrap::ReadStop() {
Debug(this, "ReadStop()");
if (stream_ != nullptr)
return stream_->ReadStop();
return 0;
}
const char* TLSWrap::Error() const {
return error_.empty() ? nullptr : error_.c_str();
}
void TLSWrap::ClearError() {
error_.clear();
}
// Called by StreamBase::Write() to request async write of clear text into SSL.
// TODO(@sam-github) Should there be a TLSWrap::DoTryWrite()?
int TLSWrap::DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) {
CHECK_NULL(send_handle);
Debug(this, "DoWrite()");
if (ssl_ == nullptr) {
ClearError();
error_ = "Write after DestroySSL";
return UV_EPROTO;
}
size_t length = 0;
size_t i;
size_t nonempty_i = 0;
size_t nonempty_count = 0;
for (i = 0; i < count; i++) {
length += bufs[i].len;
if (bufs[i].len > 0) {
nonempty_i = i;
nonempty_count += 1;
}
}
// We want to trigger a Write() on the underlying stream to drive the stream
// system, but don't want to encrypt empty buffers into a TLS frame, so see
// if we can find something to Write().
// First, call ClearOut(). It does an SSL_read(), which might cause handshake
// or other internal messages to be encrypted. If it does, write them later
// with EncOut().
// If there is still no encrypted output, call Write(bufs) on the underlying
// stream. Since the bufs are empty, it won't actually write non-TLS data
// onto the socket, we just want the side-effects. After, make sure the
// WriteWrap was accepted by the stream, or that we call Done() on it.
if (length == 0) {
Debug(this, "Empty write");
ClearOut();
if (BIO_pending(enc_out_) == 0) {
Debug(this, "No pending encrypted output, writing to underlying stream");
CHECK_NULL(current_empty_write_);
current_empty_write_ = w;
StreamWriteResult res =
underlying_stream()->Write(bufs, count, send_handle);
if (!res.async) {
BaseObjectPtr<TLSWrap> strong_ref{this};
env()->SetImmediate([this, strong_ref](Environment* env) {
OnStreamAfterWrite(current_empty_write_, 0);
});
}
return 0;
}
}
// Store the current write wrap
CHECK_NULL(current_write_);
current_write_ = w;
// Write encrypted data to underlying stream and call Done().
if (length == 0) {
EncOut();
return 0;
}
AllocatedBuffer data;
crypto::MarkPopErrorOnReturn mark_pop_error_on_return;
int written = 0;
// It is common for zero length buffers to be written,
// don't copy data if there there is one buffer with data
// and one or more zero length buffers.
// _http_outgoing.js writes a zero length buffer in
// in OutgoingMessage.prototype.end. If there was a large amount
// of data supplied to end() there is no sense allocating
// and copying it when it could just be used.
if (nonempty_count != 1) {
data = env()->AllocateManaged(length);
size_t offset = 0;
for (i = 0; i < count; i++) {
memcpy(data.data() + offset, bufs[i].base, bufs[i].len);
offset += bufs[i].len;
}
crypto::NodeBIO::FromBIO(enc_out_)->set_allocate_tls_hint(length);
written = SSL_write(ssl_.get(), data.data(), length);
} else {
// Only one buffer: try to write directly, only store if it fails
uv_buf_t* buf = &bufs[nonempty_i];
crypto::NodeBIO::FromBIO(enc_out_)->set_allocate_tls_hint(buf->len);
written = SSL_write(ssl_.get(), buf->base, buf->len);
if (written == -1) {
data = env()->AllocateManaged(length);
memcpy(data.data(), buf->base, buf->len);
}
}
CHECK(written == -1 || written == static_cast<int>(length));
Debug(this, "Writing %zu bytes, written = %d", length, written);
if (written == -1) {
int err;
Local<Value> arg = GetSSLError(written, &err, &error_);
// If we stopped writing because of an error, it's fatal, discard the data.
if (!arg.IsEmpty()) {
Debug(this, "Got SSL error (%d), returning UV_EPROTO", err);
current_write_ = nullptr;
return UV_EPROTO;
}
Debug(this, "Saving data for later write");
// Otherwise, save unwritten data so it can be written later by ClearIn().
CHECK_EQ(pending_cleartext_input_.size(), 0);
pending_cleartext_input_ = std::move(data);
}
// Write any encrypted/handshake output that may be ready.
// Guard against sync call of current_write_->Done(), its unsupported.
in_dowrite_ = true;
EncOut();
in_dowrite_ = false;
return 0;
}
uv_buf_t TLSWrap::OnStreamAlloc(size_t suggested_size) {
CHECK_NOT_NULL(ssl_);
size_t size = suggested_size;
char* base = crypto::NodeBIO::FromBIO(enc_in_)->PeekWritable(&size);
return uv_buf_init(base, size);
}
void TLSWrap::OnStreamRead(ssize_t nread, const uv_buf_t& buf) {
Debug(this, "Read %zd bytes from underlying stream", nread);
if (nread < 0) {
// Error should be emitted only after all data was read
ClearOut();
// Ignore EOF if received close_notify
if (nread == UV_EOF) {
if (eof_)
return;
eof_ = true;
}
EmitRead(nread);
return;
}
// DestroySSL() is the only thing that un-sets ssl_, but that also removes
// this TLSWrap as a stream listener, so we should not receive OnStreamRead()
// calls anymore.
CHECK(ssl_);
// Commit the amount of data actually read into the peeked/allocated buffer
// from the underlying stream.
crypto::NodeBIO* enc_in = crypto::NodeBIO::FromBIO(enc_in_);
enc_in->Commit(nread);
// Parse ClientHello first, if we need to. It's only parsed if session event
// listeners are used on the server side. "ended" is the initial state, so
// can mean parsing was never started, or that parsing is finished. Either
// way, ended means we can give the buffered data to SSL.
if (!hello_parser_.IsEnded()) {
size_t avail = 0;
uint8_t* data = reinterpret_cast<uint8_t*>(enc_in->Peek(&avail));
CHECK_IMPLIES(data == nullptr, avail == 0);
Debug(this, "Passing %zu bytes to the hello parser", avail);
return hello_parser_.Parse(data, avail);
}
// Cycle OpenSSL's state
Cycle();
}
ShutdownWrap* TLSWrap::CreateShutdownWrap(Local<Object> req_wrap_object) {
return underlying_stream()->CreateShutdownWrap(req_wrap_object);
}
int TLSWrap::DoShutdown(ShutdownWrap* req_wrap) {
Debug(this, "DoShutdown()");
crypto::MarkPopErrorOnReturn mark_pop_error_on_return;
if (ssl_ && SSL_shutdown(ssl_.get()) == 0)
SSL_shutdown(ssl_.get());
shutdown_ = true;
EncOut();
return stream_->DoShutdown(req_wrap);
}
void TLSWrap::SetVerifyMode(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_EQ(args.Length(), 2);
CHECK(args[0]->IsBoolean());
CHECK(args[1]->IsBoolean());
CHECK_NOT_NULL(wrap->ssl_);
int verify_mode;
if (wrap->is_server()) {
bool request_cert = args[0]->IsTrue();
if (!request_cert) {
// If no cert is requested, there will be none to reject as unauthorized.
verify_mode = SSL_VERIFY_NONE;
} else {
bool reject_unauthorized = args[1]->IsTrue();
verify_mode = SSL_VERIFY_PEER;
if (reject_unauthorized)
verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
} else {
// Servers always send a cert if the cipher is not anonymous (anon is
// disabled by default), so use VERIFY_NONE and check the cert after the
// handshake has completed.
verify_mode = SSL_VERIFY_NONE;
}
// Always allow a connection. We'll reject in javascript.
SSL_set_verify(wrap->ssl_.get(), verify_mode, crypto::VerifyCallback);
}
void TLSWrap::EnableSessionCallbacks(
const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_NOT_NULL(wrap->ssl_);
wrap->enable_session_callbacks();
// Clients don't use the HelloParser.
if (wrap->is_client())
return;
crypto::NodeBIO::FromBIO(wrap->enc_in_)->set_initial(kMaxHelloLength);
wrap->hello_parser_.Start(SSLWrap<TLSWrap>::OnClientHello,
OnClientHelloParseEnd,
wrap);
}
void TLSWrap::EnableKeylogCallback(
const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_NOT_NULL(wrap->sc_);
SSL_CTX_set_keylog_callback(wrap->sc_->ctx_.get(),
SSLWrap<TLSWrap>::KeylogCallback);
}
// Check required capabilities were not excluded from the OpenSSL build:
// - OPENSSL_NO_SSL_TRACE excludes SSL_trace()
// - OPENSSL_NO_STDIO excludes BIO_new_fp()
// HAVE_SSL_TRACE is available on the internal tcp_wrap binding for the tests.
#if defined(OPENSSL_NO_SSL_TRACE) || defined(OPENSSL_NO_STDIO)
# define HAVE_SSL_TRACE 0
#else
# define HAVE_SSL_TRACE 1
#endif
void TLSWrap::EnableTrace(
const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
#if HAVE_SSL_TRACE
if (wrap->ssl_) {
wrap->bio_trace_.reset(BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT));
SSL_set_msg_callback(wrap->ssl_.get(), [](int write_p, int version, int
content_type, const void* buf, size_t len, SSL* ssl, void* arg)
-> void {
// BIO_write(), etc., called by SSL_trace, may error. The error should
// be ignored, trace is a "best effort", and its usually because stderr
// is a non-blocking pipe, and its buffer has overflowed. Leaving errors
// on the stack that can get picked up by later SSL_ calls causes
// unwanted failures in SSL_ calls, so keep the error stack unchanged.
crypto::MarkPopErrorOnReturn mark_pop_error_on_return;
SSL_trace(write_p, version, content_type, buf, len, ssl, arg);
});
SSL_set_msg_callback_arg(wrap->ssl_.get(), wrap->bio_trace_.get());
}
#endif
}
void TLSWrap::DestroySSL(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
Debug(wrap, "DestroySSL()");
// If there is a write happening, mark it as finished.
wrap->write_callback_scheduled_ = true;
// And destroy
wrap->InvokeQueued(UV_ECANCELED, "Canceled because of SSL destruction");
// Destroy the SSL structure and friends
wrap->SSLWrap<TLSWrap>::DestroySSL();
wrap->enc_in_ = nullptr;
wrap->enc_out_ = nullptr;
if (wrap->stream_ != nullptr)
wrap->stream_->RemoveStreamListener(wrap);
Debug(wrap, "DestroySSL() finished");
}
void TLSWrap::EnableCertCb(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
wrap->WaitForCertCb(OnClientHelloParseEnd, wrap);
}
void TLSWrap::OnClientHelloParseEnd(void* arg) {
TLSWrap* c = static_cast<TLSWrap*>(arg);
Debug(c, "OnClientHelloParseEnd()");
c->Cycle();
}
void TLSWrap::GetServername(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_NOT_NULL(wrap->ssl_);
const char* servername = SSL_get_servername(wrap->ssl_.get(),
TLSEXT_NAMETYPE_host_name);
if (servername != nullptr) {
args.GetReturnValue().Set(OneByteString(env->isolate(), servername));
} else {
args.GetReturnValue().Set(false);
}
}
void TLSWrap::SetServername(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsString());
CHECK(!wrap->started_);
CHECK(wrap->is_client());
CHECK_NOT_NULL(wrap->ssl_);
node::Utf8Value servername(env->isolate(), args[0].As<String>());
SSL_set_tlsext_host_name(wrap->ssl_.get(), *servername);
}
int TLSWrap::SelectSNIContextCallback(SSL* s, int* ad, void* arg) {
TLSWrap* p = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = p->env();
const char* servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
if (servername == nullptr)
return SSL_TLSEXT_ERR_OK;
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
// Call the SNI callback and use its return value as context
Local<Object> object = p->object();
Local<Value> ctx;
// Set the servername as early as possible
Local<Object> owner = p->GetOwner();
if (!owner->Set(env->context(),
env->servername_string(),
OneByteString(env->isolate(), servername)).FromMaybe(false)) {
return SSL_TLSEXT_ERR_NOACK;
}
if (!object->Get(env->context(), env->sni_context_string()).ToLocal(&ctx))
return SSL_TLSEXT_ERR_NOACK;
// Not an object, probably undefined or null
if (!ctx->IsObject())
return SSL_TLSEXT_ERR_NOACK;
Local<FunctionTemplate> cons = env->secure_context_constructor_template();
if (!cons->HasInstance(ctx)) {
// Failure: incorrect SNI context object
Local<Value> err = Exception::TypeError(env->sni_context_err_string());
p->MakeCallback(env->onerror_string(), 1, &err);
return SSL_TLSEXT_ERR_NOACK;
}
SecureContext* sc = Unwrap<SecureContext>(ctx.As<Object>());
CHECK_NOT_NULL(sc);
p->sni_context_ = BaseObjectPtr<SecureContext>(sc);
p->ConfigureSecureContext(sc);
CHECK_EQ(SSL_set_SSL_CTX(p->ssl_.get(), sc->ctx_.get()), sc->ctx_.get());
p->SetCACerts(sc);
return SSL_TLSEXT_ERR_OK;
}
#ifndef OPENSSL_NO_PSK
void TLSWrap::SetPskIdentityHint(const FunctionCallbackInfo<Value>& args) {
TLSWrap* p;
ASSIGN_OR_RETURN_UNWRAP(&p, args.Holder());
CHECK_NOT_NULL(p->ssl_);
Environment* env = p->env();
Isolate* isolate = env->isolate();
CHECK(args[0]->IsString());
node::Utf8Value hint(isolate, args[0].As<String>());
if (!SSL_use_psk_identity_hint(p->ssl_.get(), *hint)) {
Local<Value> err = node::ERR_TLS_PSK_SET_IDENTIY_HINT_FAILED(isolate);
p->MakeCallback(env->onerror_string(), 1, &err);
}
}
void TLSWrap::EnablePskCallback(const FunctionCallbackInfo<Value>& args) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK_NOT_NULL(wrap->ssl_);
SSL_set_psk_server_callback(wrap->ssl_.get(), PskServerCallback);
SSL_set_psk_client_callback(wrap->ssl_.get(), PskClientCallback);
}
unsigned int TLSWrap::PskServerCallback(SSL* s,
const char* identity,
unsigned char* psk,
unsigned int max_psk_len) {
TLSWrap* p = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = p->env();
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
MaybeLocal<String> maybe_identity_str =
v8::String::NewFromUtf8(isolate, identity, v8::NewStringType::kNormal);
v8::Local<v8::String> identity_str;
if (!maybe_identity_str.ToLocal(&identity_str)) return 0;
// Make sure there are no utf8 replacement symbols.
v8::String::Utf8Value identity_utf8(isolate, identity_str);
if (strcmp(*identity_utf8, identity) != 0) return 0;
Local<Value> argv[] = {identity_str,
Integer::NewFromUnsigned(isolate, max_psk_len)};
MaybeLocal<Value> maybe_psk_val =
p->MakeCallback(env->onpskexchange_symbol(), arraysize(argv), argv);
Local<Value> psk_val;
if (!maybe_psk_val.ToLocal(&psk_val) || !psk_val->IsArrayBufferView())
return 0;
char* psk_buf = Buffer::Data(psk_val);
size_t psk_buflen = Buffer::Length(psk_val);
if (psk_buflen > max_psk_len) return 0;
memcpy(psk, psk_buf, psk_buflen);
return psk_buflen;
}
unsigned int TLSWrap::PskClientCallback(SSL* s,
const char* hint,
char* identity,
unsigned int max_identity_len,
unsigned char* psk,
unsigned int max_psk_len) {
TLSWrap* p = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = p->env();
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
Local<Value> argv[] = {Null(isolate),
Integer::NewFromUnsigned(isolate, max_psk_len),
Integer::NewFromUnsigned(isolate, max_identity_len)};
if (hint != nullptr) {
MaybeLocal<String> maybe_hint = String::NewFromUtf8(isolate, hint);
Local<String> local_hint;
if (!maybe_hint.ToLocal(&local_hint)) return 0;
argv[0] = local_hint;
}
MaybeLocal<Value> maybe_ret =
p->MakeCallback(env->onpskexchange_symbol(), arraysize(argv), argv);
Local<Value> ret;
if (!maybe_ret.ToLocal(&ret) || !ret->IsObject()) return 0;
Local<Object> obj = ret.As<Object>();
MaybeLocal<Value> maybe_psk_val = obj->Get(env->context(), env->psk_string());
Local<Value> psk_val;
if (!maybe_psk_val.ToLocal(&psk_val) || !psk_val->IsArrayBufferView())
return 0;
char* psk_buf = Buffer::Data(psk_val);
size_t psk_buflen = Buffer::Length(psk_val);
if (psk_buflen > max_psk_len) return 0;
MaybeLocal<Value> maybe_identity_val =
obj->Get(env->context(), env->identity_string());
Local<Value> identity_val;
if (!maybe_identity_val.ToLocal(&identity_val) || !identity_val->IsString())
return 0;
Local<String> identity_str = identity_val.As<String>();
String::Utf8Value identity_buf(isolate, identity_str);
size_t identity_len = identity_buf.length();
if (identity_len > max_identity_len) return 0;
memcpy(identity, *identity_buf, identity_len);
memcpy(psk, psk_buf, psk_buflen);
return psk_buflen;
}
#endif
void TLSWrap::GetWriteQueueSize(const FunctionCallbackInfo<Value>& info) {
TLSWrap* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, info.This());
if (wrap->ssl_ == nullptr) {
info.GetReturnValue().Set(0);
return;
}
uint32_t write_queue_size = BIO_pending(wrap->enc_out_);
info.GetReturnValue().Set(write_queue_size);
}
void TLSWrap::MemoryInfo(MemoryTracker* tracker) const {
SSLWrap<TLSWrap>::MemoryInfo(tracker);
tracker->TrackField("error", error_);
tracker->TrackFieldWithSize("pending_cleartext_input",
pending_cleartext_input_.size(),
"AllocatedBuffer");
if (enc_in_ != nullptr)
tracker->TrackField("enc_in", crypto::NodeBIO::FromBIO(enc_in_));
if (enc_out_ != nullptr)
tracker->TrackField("enc_out", crypto::NodeBIO::FromBIO(enc_out_));
}
void TLSWrap::Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(target, "wrap", TLSWrap::Wrap);
NODE_DEFINE_CONSTANT(target, HAVE_SSL_TRACE);
Local<FunctionTemplate> t = BaseObject::MakeLazilyInitializedJSTemplate(env);
Local<String> tlsWrapString =
FIXED_ONE_BYTE_STRING(env->isolate(), "TLSWrap");
t->SetClassName(tlsWrapString);
t->InstanceTemplate()->SetInternalFieldCount(StreamBase::kInternalFieldCount);
Local<FunctionTemplate> get_write_queue_size =
FunctionTemplate::New(env->isolate(),
GetWriteQueueSize,
Local<Value>(),
Signature::New(env->isolate(), t));
t->PrototypeTemplate()->SetAccessorProperty(
env->write_queue_size_string(),
get_write_queue_size,
Local<FunctionTemplate>(),
static_cast<PropertyAttribute>(ReadOnly | DontDelete));
t->Inherit(AsyncWrap::GetConstructorTemplate(env));
env->SetProtoMethod(t, "receive", Receive);
env->SetProtoMethod(t, "start", Start);
env->SetProtoMethod(t, "setVerifyMode", SetVerifyMode);
env->SetProtoMethod(t, "enableSessionCallbacks", EnableSessionCallbacks);
env->SetProtoMethod(t, "enableKeylogCallback", EnableKeylogCallback);
env->SetProtoMethod(t, "enableTrace", EnableTrace);
env->SetProtoMethod(t, "destroySSL", DestroySSL);
env->SetProtoMethod(t, "enableCertCb", EnableCertCb);
#ifndef OPENSSL_NO_PSK
env->SetProtoMethod(t, "setPskIdentityHint", SetPskIdentityHint);
env->SetProtoMethod(t, "enablePskCallback", EnablePskCallback);
#endif
StreamBase::AddMethods(env, t);
SSLWrap<TLSWrap>::AddMethods(env, t);
env->SetProtoMethod(t, "getServername", GetServername);
env->SetProtoMethod(t, "setServername", SetServername);
Local<Function> fn = t->GetFunction(env->context()).ToLocalChecked();
env->set_tls_wrap_constructor_function(fn);
target->Set(env->context(), tlsWrapString, fn).Check();
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_INTERNAL(tls_wrap, node::TLSWrap::Initialize)
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