/
crypto_tls.cc
2106 lines (1717 loc) · 64.2 KB
/
crypto_tls.cc
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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 "crypto/crypto_tls.h"
#include "crypto/crypto_context.h"
#include "crypto/crypto_common.h"
#include "crypto/crypto_util.h"
#include "crypto/crypto_bio.h"
#include "crypto/crypto_clienthello-inl.h"
#include "allocated_buffer-inl.h"
#include "async_wrap-inl.h"
#include "debug_utils-inl.h"
#include "memory_tracker-inl.h"
#include "node_buffer.h"
#include "node_errors.h"
#include "stream_base-inl.h"
#include "util-inl.h"
namespace node {
using v8::Array;
using v8::ArrayBufferView;
using v8::Context;
using v8::DontDelete;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::False;
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::Null;
using v8::Object;
using v8::PropertyAttribute;
using v8::ReadOnly;
using v8::Signature;
using v8::String;
using v8::True;
using v8::Uint32;
using v8::Value;
namespace crypto {
namespace {
SSL_SESSION* GetSessionCallback(
SSL* s,
const unsigned char* key,
int len,
int* copy) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
*copy = 0;
return w->ReleaseSession();
}
void OnClientHello(
void* arg,
const ClientHelloParser::ClientHello& hello) {
TLSWrap* w = static_cast<TLSWrap*>(arg);
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Object> hello_obj = Object::New(env->isolate());
Local<String> servername = (hello.servername() == nullptr)
? String::Empty(env->isolate())
: OneByteString(env->isolate(),
hello.servername(),
hello.servername_size());
Local<Object> buf =
Buffer::Copy(
env,
reinterpret_cast<const char*>(hello.session_id()),
hello.session_size()).FromMaybe(Local<Object>());
if ((buf.IsEmpty() ||
hello_obj->Set(env->context(), env->session_id_string(), buf)
.IsNothing()) ||
hello_obj->Set(env->context(), env->servername_string(), servername)
.IsNothing() ||
hello_obj->Set(
env->context(),
env->tls_ticket_string(),
hello.has_ticket()
? True(env->isolate())
: False(env->isolate())).IsNothing()) {
return;
}
Local<Value> argv[] = { hello_obj };
w->MakeCallback(env->onclienthello_string(), arraysize(argv), argv);
}
void KeylogCallback(const SSL* s, const char* line) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
const size_t size = strlen(line);
Local<Value> line_bf = Buffer::Copy(env, line, 1 + size)
.FromMaybe(Local<Value>());
if (UNLIKELY(line_bf.IsEmpty()))
return;
char* data = Buffer::Data(line_bf);
data[size] = '\n';
w->MakeCallback(env->onkeylog_string(), 1, &line_bf);
}
int NewSessionCallback(SSL* s, SSL_SESSION* sess) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
if (!w->has_session_callbacks())
return 0;
// Check if session is small enough to be stored
int size = i2d_SSL_SESSION(sess, nullptr);
if (UNLIKELY(size > SecureContext::kMaxSessionSize))
return 0;
// Serialize session
Local<Object> session = Buffer::New(env, size).FromMaybe(Local<Object>());
if (UNLIKELY(session.IsEmpty()))
return 0;
unsigned char* session_data =
reinterpret_cast<unsigned char*>(Buffer::Data(session));
CHECK_EQ(i2d_SSL_SESSION(sess, &session_data), size);
unsigned int session_id_length;
const unsigned char* session_id_data =
SSL_SESSION_get_id(sess, &session_id_length);
Local<Object> session_id = Buffer::Copy(
env,
reinterpret_cast<const char*>(session_id_data),
session_id_length).FromMaybe(Local<Object>());
if (UNLIKELY(session_id.IsEmpty()))
return 0;
Local<Value> argv[] = {
session_id,
session
};
// On servers, we pause the handshake until callback of 'newSession', which
// calls NewSessionDoneCb(). On clients, there is no callback to wait for.
if (w->is_server())
w->set_awaiting_new_session(true);
w->MakeCallback(env->onnewsession_string(), arraysize(argv), argv);
return 0;
}
int SSLCertCallback(SSL* s, void* arg) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
if (!w->is_server() || !w->is_waiting_cert_cb())
return 1;
if (w->is_cert_cb_running())
// Not an error. Suspend handshake with SSL_ERROR_WANT_X509_LOOKUP, and
// handshake will continue after certcb is done.
return -1;
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
w->set_cert_cb_running();
Local<Object> info = Object::New(env->isolate());
const char* servername = GetServerName(s);
Local<String> servername_str = (servername == nullptr)
? String::Empty(env->isolate())
: OneByteString(env->isolate(), servername, strlen(servername));
Local<Value> ocsp = (SSL_get_tlsext_status_type(s) == TLSEXT_STATUSTYPE_ocsp)
? True(env->isolate())
: False(env->isolate());
if (info->Set(env->context(), env->servername_string(), servername_str)
.IsNothing() ||
info->Set(env->context(), env->ocsp_request_string(), ocsp).IsNothing()) {
return 1;
}
Local<Value> argv[] = { info };
w->MakeCallback(env->oncertcb_string(), arraysize(argv), argv);
return w->is_cert_cb_running() ? -1 : 1;
}
int SelectALPNCallback(
SSL* s,
const unsigned char** out,
unsigned char* outlen,
const unsigned char* in,
unsigned int inlen,
void* arg) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
Local<Value> alpn_buffer =
w->object()->GetPrivate(
env->context(),
env->alpn_buffer_private_symbol()).FromMaybe(Local<Value>());
if (UNLIKELY(alpn_buffer.IsEmpty()) || !alpn_buffer->IsArrayBufferView())
return SSL_TLSEXT_ERR_NOACK;
ArrayBufferViewContents<unsigned char> alpn_protos(alpn_buffer);
int status = SSL_select_next_proto(
const_cast<unsigned char**>(out),
outlen,
alpn_protos.data(),
alpn_protos.length(),
in,
inlen);
// According to 3.2. Protocol Selection of RFC7301, fatal
// no_application_protocol alert shall be sent but OpenSSL 1.0.2 does not
// support it yet. See
// https://rt.openssl.org/Ticket/Display.html?id=3463&user=guest&pass=guest
return status == OPENSSL_NPN_NEGOTIATED
? SSL_TLSEXT_ERR_OK
: SSL_TLSEXT_ERR_NOACK;
}
int TLSExtStatusCallback(SSL* s, void* arg) {
TLSWrap* w = static_cast<TLSWrap*>(SSL_get_app_data(s));
Environment* env = w->env();
HandleScope handle_scope(env->isolate());
if (w->is_client()) {
// Incoming response
Local<Value> arg;
if (GetSSLOCSPResponse(env, s, Null(env->isolate())).ToLocal(&arg))
w->MakeCallback(env->onocspresponse_string(), 1, &arg);
// No async acceptance is possible, so always return 1 to accept the
// response. The listener for 'OCSPResponse' event has no control over
// return value, but it can .destroy() the connection if the response is not
// acceptable.
return 1;
}
// Outgoing response
Local<ArrayBufferView> obj =
w->ocsp_response().FromMaybe(Local<ArrayBufferView>());
if (UNLIKELY(obj.IsEmpty()))
return SSL_TLSEXT_ERR_NOACK;
size_t len = obj->ByteLength();
// OpenSSL takes control of the pointer after accepting it
unsigned char* data = MallocOpenSSL<unsigned char>(len);
obj->CopyContents(data, len);
if (!SSL_set_tlsext_status_ocsp_resp(s, data, len))
OPENSSL_free(data);
w->ClearOcspResponse();
return SSL_TLSEXT_ERR_OK;
}
void ConfigureSecureContext(SecureContext* sc) {
// OCSP stapling
SSL_CTX_set_tlsext_status_cb(sc->ctx_.get(), TLSExtStatusCallback);
SSL_CTX_set_tlsext_status_arg(sc->ctx_.get(), nullptr);
}
inline bool Set(
Environment* env,
Local<Object> target,
Local<String> name,
const char* value,
bool ignore_null = true) {
if (value == nullptr)
return ignore_null;
return !target->Set(
env->context(),
name,
OneByteString(env->isolate(), value))
.IsNothing();
}
} // namespace
TLSWrap::TLSWrap(Environment* env,
Local<Object> obj,
Kind kind,
StreamBase* stream,
SecureContext* sc)
: AsyncWrap(env, obj, AsyncWrap::PROVIDER_TLSWRAP),
StreamBase(env),
env_(env),
kind_(kind),
sc_(sc) {
MakeWeak();
CHECK(sc_);
ssl_ = sc_->CreateSSL();
CHECK(ssl_);
sc_->SetGetSessionCallback(GetSessionCallback);
sc_->SetNewSessionCallback(NewSessionCallback);
StreamBase::AttachToObject(GetObject());
stream->PushStreamListener(this);
env_->isolate()->AdjustAmountOfExternalAllocatedMemory(kExternalSize);
InitSSL();
Debug(this, "Created new TLSWrap");
}
TLSWrap::~TLSWrap() {
Destroy();
}
MaybeLocal<ArrayBufferView> TLSWrap::ocsp_response() const {
if (ocsp_response_.IsEmpty())
return MaybeLocal<ArrayBufferView>();
return PersistentToLocal::Default(env()->isolate(), ocsp_response_);
}
void TLSWrap::ClearOcspResponse() {
ocsp_response_.Reset();
}
SSL_SESSION* TLSWrap::ReleaseSession() {
return next_sess_.release();
}
void TLSWrap::InvokeQueued(int status, const char* error_str) {
Debug(this, "Invoking queued write callbacks (%d, %s)", status, error_str);
if (!write_callback_scheduled_)
return;
if (current_write_) {
BaseObjectPtr<AsyncWrap> current_write = std::move(current_write_);
current_write_.reset();
WriteWrap* w = WriteWrap::FromObject(current_write);
w->Done(status, error_str);
}
}
void TLSWrap::NewSessionDoneCb() {
Debug(this, "New session callback done");
Cycle();
}
void TLSWrap::InitSSL() {
// Initialize SSL – OpenSSL takes ownership of these.
enc_in_ = NodeBIO::New(env()).release();
enc_out_ = 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, 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);
#ifdef OPENSSL_IS_BORINGSSL
// OpenSSL allows renegotiation by default, but BoringSSL disables it.
// Configure BoringSSL to match OpenSSL's behavior.
SSL_set_renegotiate_mode(ssl_.get(), ssl_renegotiate_freely);
#endif
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())
sc_->SetSelectSNIContextCallback(SelectSNIContextCallback);
ConfigureSecureContext(sc_.get());
SSL_set_cert_cb(ssl_.get(), SSLCertCallback, this);
if (is_server()) {
SSL_set_accept_state(ssl_.get());
} else if (is_client()) {
// Enough space for server response (hello, cert)
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() ? Kind::kServer : Kind::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_) {
Debug(this, "EncOut() write is 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_ = 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_) {
Debug(this, "Had empty write");
BaseObjectPtr<AsyncWrap> current_empty_write =
std::move(current_empty_write_);
current_empty_write_.reset();
WriteWrap* finishing = WriteWrap::FromObject(current_empty_write);
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
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();
}
MaybeLocal<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 MaybeLocal<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 MaybeLocal<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).FromMaybe(Local<Object>());
if (UNLIKELY(obj.IsEmpty()))
return MaybeLocal<Value>();
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 (!Set(env(), obj, env()->library_string(), ls) ||
!Set(env(), obj, env()->function_string(), fs)) {
return MaybeLocal<Value>();
}
if (rs != nullptr) {
if (!Set(env(), obj, env()->reason_string(), rs))
return MaybeLocal<Value>();
// 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)
c = (c == ' ') ? '_' : ToUpper(c);
if (!Set(env(), obj,
env()->code_string(),
("ERR_SSL_" + code).c_str())) {
return MaybeLocal<Value>();
}
}
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;
}
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)
.FromMaybe(Local<Value>());
// Ignore ZERO_RETURN after EOF, it is basically not a error
if (err == SSL_ERROR_ZERO_RETURN && eof_)
return;
if (LIKELY(!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_);
MarkPopErrorOnReturn mark_pop_error_on_return;
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;
MaybeLocal<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.
return InvokeQueued(UV_EPROTO, error_str.c_str());
}
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 ";
name += is_server() ? "server (" : "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_ &&
underlying_stream() != nullptr &&
underlying_stream()->IsAlive();
}
bool TLSWrap::IsClosing() {
return underlying_stream()->IsClosing();
}
int TLSWrap::ReadStart() {
Debug(this, "ReadStart()");
if (underlying_stream() != nullptr)
return underlying_stream()->ReadStart();
return 0;
}
int TLSWrap::ReadStop() {
Debug(this, "ReadStop()");
return underlying_stream() != nullptr ? underlying_stream()->ReadStop() : 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(!current_empty_write_);
current_empty_write_.reset(w->GetAsyncWrap());
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(WriteWrap::FromObject(current_empty_write_), 0);
});
}
return 0;
}
}
// Store the current write wrap
CHECK(!current_write_);
current_write_.reset(w->GetAsyncWrap());
// Write encrypted data to underlying stream and call Done().
if (length == 0) {
EncOut();
return 0;
}