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780 lines (629 loc) · 24.4 KB
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#include "node.h"
#include "node_internals.h"
#include "node_watchdog.h"
#include "base-object.h"
#include "base-object-inl.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"
#include "v8-debug.h"
namespace node {
using v8::AccessType;
using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::Debug;
using v8::EscapableHandleScope;
using v8::External;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Name;
using v8::NamedPropertyHandlerConfiguration;
using v8::None;
using v8::Object;
using v8::ObjectTemplate;
using v8::Persistent;
using v8::PropertyAttribute;
using v8::PropertyCallbackInfo;
using v8::Script;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::String;
using v8::TryCatch;
using v8::UnboundScript;
using v8::V8;
using v8::Value;
using v8::WeakCallbackData;
class ContextifyContext {
protected:
enum Kind {
kSandbox,
kContext,
kProxyGlobal
};
Environment* const env_;
Persistent<Object> sandbox_;
Persistent<Context> context_;
Persistent<Object> proxy_global_;
int references_;
public:
explicit ContextifyContext(Environment* env, Local<Object> sandbox)
: env_(env),
sandbox_(env->isolate(), sandbox),
// Wait for sandbox_, proxy_global_, and context_ to die
references_(0) {
context_.Reset(env->isolate(), CreateV8Context(env));
sandbox_.SetWeak(this, WeakCallback<Object, kSandbox>);
sandbox_.MarkIndependent();
references_++;
// Allocation failure or maximum call stack size reached
if (context_.IsEmpty())
return;
context_.SetWeak(this, WeakCallback<Context, kContext>);
context_.MarkIndependent();
references_++;
proxy_global_.Reset(env->isolate(), context()->Global());
proxy_global_.SetWeak(this, WeakCallback<Object, kProxyGlobal>);
proxy_global_.MarkIndependent();
references_++;
}
~ContextifyContext() {
context_.Reset();
proxy_global_.Reset();
sandbox_.Reset();
}
inline Environment* env() const {
return env_;
}
inline Local<Context> context() const {
return PersistentToLocal(env()->isolate(), context_);
}
// XXX(isaacs): This function only exists because of a shortcoming of
// the V8 SetNamedPropertyHandler function.
//
// It does not provide a way to intercept Object.defineProperty(..)
// calls. As a result, these properties are not copied onto the
// contextified sandbox when a new global property is added via either
// a function declaration or a Object.defineProperty(global, ...) call.
//
// Note that any function declarations or Object.defineProperty()
// globals that are created asynchronously (in a setTimeout, callback,
// etc.) will happen AFTER the call to copy properties, and thus not be
// caught.
//
// The way to properly fix this is to add some sort of a
// Object::SetNamedDefinePropertyHandler() function that takes a callback,
// which receives the property name and property descriptor as arguments.
//
// Luckily, such situations are rare, and asynchronously-added globals
// weren't supported by Node's VM module until 0.12 anyway. But, this
// should be fixed properly in V8, and this copy function should be
// removed once there is a better way.
void CopyProperties() {
HandleScope scope(env()->isolate());
Local<Context> context = PersistentToLocal(env()->isolate(), context_);
Local<Object> global =
context->Global()->GetPrototype()->ToObject(env()->isolate());
Local<Object> sandbox = PersistentToLocal(env()->isolate(), sandbox_);
Local<Function> clone_property_method;
Local<Array> names = global->GetOwnPropertyNames();
int length = names->Length();
for (int i = 0; i < length; i++) {
Local<String> key = names->Get(i)->ToString(env()->isolate());
bool has = sandbox->HasOwnProperty(key);
if (!has) {
// Could also do this like so:
//
// PropertyAttribute att = global->GetPropertyAttributes(key_v);
// Local<Value> val = global->Get(key_v);
// sandbox->ForceSet(key_v, val, att);
//
// However, this doesn't handle ES6-style properties configured with
// Object.defineProperty, and that's exactly what we're up against at
// this point. ForceSet(key,val,att) only supports value properties
// with the ES3-style attribute flags (DontDelete/DontEnum/ReadOnly),
// which doesn't faithfully capture the full range of configurations
// that can be done using Object.defineProperty.
if (clone_property_method.IsEmpty()) {
Local<String> code = FIXED_ONE_BYTE_STRING(env()->isolate(),
"(function cloneProperty(source, key, target) {\n"
" if (key === 'Proxy') return;\n"
" try {\n"
" var desc = Object.getOwnPropertyDescriptor(source, key);\n"
" if (desc.value === source) desc.value = target;\n"
" Object.defineProperty(target, key, desc);\n"
" } catch (e) {\n"
" // Catch sealed properties errors\n"
" }\n"
"})");
Local<String> fname = FIXED_ONE_BYTE_STRING(env()->isolate(),
"binding:script");
Local<Script> script = Script::Compile(code, fname);
clone_property_method = Local<Function>::Cast(script->Run());
CHECK(clone_property_method->IsFunction());
}
Local<Value> args[] = { global, key, sandbox };
clone_property_method->Call(global, ARRAY_SIZE(args), args);
}
}
}
// This is an object that just keeps an internal pointer to this
// ContextifyContext. It's passed to the NamedPropertyHandler. If we
// pass the main JavaScript context object we're embedded in, then the
// NamedPropertyHandler will store a reference to it forever and keep it
// from getting gc'd.
Local<Value> CreateDataWrapper(Environment* env) {
EscapableHandleScope scope(env->isolate());
Local<Object> wrapper =
env->script_data_constructor_function()->NewInstance();
if (wrapper.IsEmpty())
return scope.Escape(Local<Value>::New(env->isolate(), Local<Value>()));
Wrap(wrapper, this);
return scope.Escape(wrapper);
}
Local<Context> CreateV8Context(Environment* env) {
EscapableHandleScope scope(env->isolate());
Local<FunctionTemplate> function_template =
FunctionTemplate::New(env->isolate());
function_template->SetHiddenPrototype(true);
Local<Object> sandbox = PersistentToLocal(env->isolate(), sandbox_);
function_template->SetClassName(sandbox->GetConstructorName());
Local<ObjectTemplate> object_template =
function_template->InstanceTemplate();
NamedPropertyHandlerConfiguration config(GlobalPropertyGetterCallback,
GlobalPropertySetterCallback,
GlobalPropertyQueryCallback,
GlobalPropertyDeleterCallback,
GlobalPropertyEnumeratorCallback,
CreateDataWrapper(env));
object_template->SetHandler(config);
Local<Context> ctx = Context::New(env->isolate(), nullptr, object_template);
CHECK(!ctx.IsEmpty());
ctx->SetSecurityToken(env->context()->GetSecurityToken());
env->AssignToContext(ctx);
return scope.Escape(ctx);
}
static void Init(Environment* env, Local<Object> target) {
Local<FunctionTemplate> function_template =
FunctionTemplate::New(env->isolate());
function_template->InstanceTemplate()->SetInternalFieldCount(1);
env->set_script_data_constructor_function(function_template->GetFunction());
env->SetMethod(target, "runInDebugContext", RunInDebugContext);
env->SetMethod(target, "makeContext", MakeContext);
env->SetMethod(target, "isContext", IsContext);
}
static void RunInDebugContext(const FunctionCallbackInfo<Value>& args) {
// Ensure that the debug context has an Environment assigned in case
// a fatal error is raised. The fatal exception handler in node.cc
// is not equipped to deal with contexts that don't have one and
// can't easily be taught that due to a deficiency in the V8 API:
// there is no way for the embedder to tell if the data index is
// in use.
struct ScopedEnvironment {
ScopedEnvironment(Local<Context> context, Environment* env)
: context_(context) {
const int index = Environment::kContextEmbedderDataIndex;
context->SetAlignedPointerInEmbedderData(index, env);
}
~ScopedEnvironment() {
const int index = Environment::kContextEmbedderDataIndex;
context_->SetAlignedPointerInEmbedderData(index, nullptr);
}
Local<Context> context_;
};
Local<String> script_source(args[0]->ToString(args.GetIsolate()));
if (script_source.IsEmpty())
return; // Exception pending.
Local<Context> debug_context = Debug::GetDebugContext();
if (debug_context.IsEmpty()) {
// Force-load the debug context.
Debug::GetMirror(args.GetIsolate()->GetCurrentContext(), args[0]);
debug_context = Debug::GetDebugContext();
CHECK(!debug_context.IsEmpty());
}
Environment* env = Environment::GetCurrent(args);
ScopedEnvironment env_scope(debug_context, env);
Context::Scope context_scope(debug_context);
Local<Script> script = Script::Compile(script_source);
if (script.IsEmpty())
return; // Exception pending.
args.GetReturnValue().Set(script->Run());
}
static void MakeContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsObject()) {
return env->ThrowTypeError("sandbox argument must be an object.");
}
Local<Object> sandbox = args[0].As<Object>();
Local<String> hidden_name =
FIXED_ONE_BYTE_STRING(env->isolate(), "_contextifyHidden");
// Don't allow contextifying a sandbox multiple times.
CHECK(sandbox->GetHiddenValue(hidden_name).IsEmpty());
TryCatch try_catch;
ContextifyContext* context = new ContextifyContext(env, sandbox);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
if (context->context().IsEmpty())
return;
Local<External> hidden_context = External::New(env->isolate(), context);
sandbox->SetHiddenValue(hidden_name, hidden_context);
}
static void IsContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsObject()) {
env->ThrowTypeError("sandbox must be an object");
return;
}
Local<Object> sandbox = args[0].As<Object>();
Local<String> hidden_name =
FIXED_ONE_BYTE_STRING(env->isolate(), "_contextifyHidden");
args.GetReturnValue().Set(!sandbox->GetHiddenValue(hidden_name).IsEmpty());
}
template <class T, Kind kind>
static void WeakCallback(const WeakCallbackData<T, ContextifyContext>& data) {
ContextifyContext* context = data.GetParameter();
if (kind == kSandbox)
context->sandbox_.ClearWeak();
else if (kind == kContext)
context->context_.ClearWeak();
else
context->proxy_global_.ClearWeak();
if (--context->references_ == 0)
delete context;
}
static ContextifyContext* ContextFromContextifiedSandbox(
Isolate* isolate,
const Local<Object>& sandbox) {
Local<String> hidden_name =
FIXED_ONE_BYTE_STRING(isolate, "_contextifyHidden");
Local<Value> context_external_v = sandbox->GetHiddenValue(hidden_name);
if (context_external_v.IsEmpty() || !context_external_v->IsExternal()) {
return nullptr;
}
Local<External> context_external = context_external_v.As<External>();
return static_cast<ContextifyContext*>(context_external->Value());
}
static void GlobalPropertyGetterCallback(
Local<Name> property,
const PropertyCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());
// Stil initializing
if (ctx->context_.IsEmpty())
return;
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);
MaybeLocal<Value> maybe_rv =
sandbox->GetRealNamedProperty(ctx->context(), property);
if (maybe_rv.IsEmpty()) {
Local<Object> proxy_global = PersistentToLocal(isolate,
ctx->proxy_global_);
maybe_rv = proxy_global->GetRealNamedProperty(ctx->context(), property);
}
Local<Value> rv;
if (maybe_rv.ToLocal(&rv)) {
if (rv == ctx->sandbox_)
rv = PersistentToLocal(isolate, ctx->proxy_global_);
args.GetReturnValue().Set(rv);
}
}
static void GlobalPropertySetterCallback(
Local<Name> property,
Local<Value> value,
const PropertyCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());
// Stil initializing
if (ctx->context_.IsEmpty())
return;
PersistentToLocal(isolate, ctx->sandbox_)->Set(property, value);
}
static void GlobalPropertyQueryCallback(
Local<Name> property,
const PropertyCallbackInfo<Integer>& args) {
Isolate* isolate = args.GetIsolate();
ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());
// Stil initializing
if (ctx->context_.IsEmpty())
return;
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);
Maybe<PropertyAttribute> maybe_prop_attr =
sandbox->GetRealNamedPropertyAttributes(ctx->context(), property);
if (maybe_prop_attr.IsNothing()) {
Local<Object> proxy_global = PersistentToLocal(isolate,
ctx->proxy_global_);
maybe_prop_attr =
proxy_global->GetRealNamedPropertyAttributes(ctx->context(),
property);
}
if (maybe_prop_attr.IsJust()) {
PropertyAttribute prop_attr = maybe_prop_attr.FromJust();
args.GetReturnValue().Set(prop_attr);
}
}
static void GlobalPropertyDeleterCallback(
Local<Name> property,
const PropertyCallbackInfo<Boolean>& args) {
Isolate* isolate = args.GetIsolate();
ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());
// Stil initializing
if (ctx->context_.IsEmpty())
return;
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);
Maybe<bool> success = sandbox->Delete(ctx->context(), property);
if (success.IsJust())
args.GetReturnValue().Set(success.FromJust());
}
static void GlobalPropertyEnumeratorCallback(
const PropertyCallbackInfo<Array>& args) {
ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());
// Stil initializing
if (ctx->context_.IsEmpty())
return;
Local<Object> sandbox = PersistentToLocal(args.GetIsolate(), ctx->sandbox_);
args.GetReturnValue().Set(sandbox->GetPropertyNames());
}
};
class ContextifyScript : public BaseObject {
private:
Persistent<UnboundScript> script_;
public:
static void Init(Environment* env, Local<Object> target) {
HandleScope scope(env->isolate());
Local<String> class_name =
FIXED_ONE_BYTE_STRING(env->isolate(), "ContextifyScript");
Local<FunctionTemplate> script_tmpl = env->NewFunctionTemplate(New);
script_tmpl->InstanceTemplate()->SetInternalFieldCount(1);
script_tmpl->SetClassName(class_name);
env->SetProtoMethod(script_tmpl, "runInContext", RunInContext);
env->SetProtoMethod(script_tmpl, "runInThisContext", RunInThisContext);
target->Set(class_name, script_tmpl->GetFunction());
env->set_script_context_constructor_template(script_tmpl);
}
// args: code, [options]
static void New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args.IsConstructCall()) {
return env->ThrowError("Must call vm.Script as a constructor.");
}
ContextifyScript* contextify_script =
new ContextifyScript(env, args.This());
TryCatch try_catch;
Local<String> code = args[0]->ToString(env->isolate());
Local<String> filename = GetFilenameArg(args, 1);
Local<Integer> lineOffset = GetLineOffsetArg(args, 1);
Local<Integer> columnOffset = GetColumnOffsetArg(args, 1);
bool display_errors = GetDisplayErrorsArg(args, 1);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
ScriptOrigin origin(filename, lineOffset, columnOffset);
ScriptCompiler::Source source(code, origin);
Local<UnboundScript> v8_script =
ScriptCompiler::CompileUnbound(env->isolate(), &source);
if (v8_script.IsEmpty()) {
if (display_errors) {
AppendExceptionLine(env, try_catch.Exception(), try_catch.Message());
}
try_catch.ReThrow();
return;
}
contextify_script->script_.Reset(env->isolate(), v8_script);
}
static bool InstanceOf(Environment* env, const Local<Value>& value) {
return !value.IsEmpty() &&
env->script_context_constructor_template()->HasInstance(value);
}
// args: [options]
static void RunInThisContext(const FunctionCallbackInfo<Value>& args) {
// Assemble arguments
TryCatch try_catch;
uint64_t timeout = GetTimeoutArg(args, 0);
bool display_errors = GetDisplayErrorsArg(args, 0);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
// Do the eval within this context
Environment* env = Environment::GetCurrent(args);
EvalMachine(env, timeout, display_errors, args, try_catch);
}
// args: sandbox, [options]
static void RunInContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int64_t timeout;
bool display_errors;
// Assemble arguments
if (!args[0]->IsObject()) {
return env->ThrowTypeError(
"contextifiedSandbox argument must be an object.");
}
Local<Object> sandbox = args[0].As<Object>();
{
TryCatch try_catch;
timeout = GetTimeoutArg(args, 1);
display_errors = GetDisplayErrorsArg(args, 1);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
}
// Get the context from the sandbox
ContextifyContext* contextify_context =
ContextifyContext::ContextFromContextifiedSandbox(env->isolate(),
sandbox);
if (contextify_context == nullptr) {
return env->ThrowTypeError(
"sandbox argument must have been converted to a context.");
}
if (contextify_context->context().IsEmpty())
return;
{
TryCatch try_catch;
// Do the eval within the context
Context::Scope context_scope(contextify_context->context());
if (EvalMachine(contextify_context->env(),
timeout,
display_errors,
args,
try_catch)) {
contextify_context->CopyProperties();
}
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
}
}
static int64_t GetTimeoutArg(const FunctionCallbackInfo<Value>& args,
const int i) {
if (args[i]->IsUndefined() || args[i]->IsString()) {
return -1;
}
if (!args[i]->IsObject()) {
Environment::ThrowTypeError(args.GetIsolate(),
"options must be an object");
return -1;
}
Local<String> key = FIXED_ONE_BYTE_STRING(args.GetIsolate(), "timeout");
Local<Value> value = args[i].As<Object>()->Get(key);
if (value->IsUndefined()) {
return -1;
}
int64_t timeout = value->IntegerValue();
if (timeout <= 0) {
Environment::ThrowRangeError(args.GetIsolate(),
"timeout must be a positive number");
return -1;
}
return timeout;
}
static bool GetDisplayErrorsArg(const FunctionCallbackInfo<Value>& args,
const int i) {
if (args[i]->IsUndefined() || args[i]->IsString()) {
return true;
}
if (!args[i]->IsObject()) {
Environment::ThrowTypeError(args.GetIsolate(),
"options must be an object");
return false;
}
Local<String> key = FIXED_ONE_BYTE_STRING(args.GetIsolate(),
"displayErrors");
Local<Value> value = args[i].As<Object>()->Get(key);
return value->IsUndefined() ? true : value->BooleanValue();
}
static Local<String> GetFilenameArg(const FunctionCallbackInfo<Value>& args,
const int i) {
Local<String> defaultFilename =
FIXED_ONE_BYTE_STRING(args.GetIsolate(), "evalmachine.<anonymous>");
if (args[i]->IsUndefined()) {
return defaultFilename;
}
if (args[i]->IsString()) {
return args[i].As<String>();
}
if (!args[i]->IsObject()) {
Environment::ThrowTypeError(args.GetIsolate(),
"options must be an object");
return Local<String>();
}
Local<String> key = FIXED_ONE_BYTE_STRING(args.GetIsolate(), "filename");
Local<Value> value = args[i].As<Object>()->Get(key);
if (value->IsUndefined())
return defaultFilename;
return value->ToString(args.GetIsolate());
}
static Local<Integer> GetLineOffsetArg(
const FunctionCallbackInfo<Value>& args,
const int i) {
Local<Integer> defaultLineOffset = Integer::New(args.GetIsolate(), 0);
if (!args[i]->IsObject()) {
return defaultLineOffset;
}
Local<String> key = FIXED_ONE_BYTE_STRING(args.GetIsolate(), "lineOffset");
Local<Value> value = args[i].As<Object>()->Get(key);
return value->IsUndefined() ? defaultLineOffset : value->ToInteger();
}
static Local<Integer> GetColumnOffsetArg(
const FunctionCallbackInfo<Value>& args,
const int i) {
Local<Integer> defaultColumnOffset = Integer::New(args.GetIsolate(), 0);
if (!args[i]->IsObject()) {
return defaultColumnOffset;
}
Local<String> key = FIXED_ONE_BYTE_STRING(args.GetIsolate(),
"columnOffset");
Local<Value> value = args[i].As<Object>()->Get(key);
return value->IsUndefined() ? defaultColumnOffset : value->ToInteger();
}
static bool EvalMachine(Environment* env,
const int64_t timeout,
const bool display_errors,
const FunctionCallbackInfo<Value>& args,
TryCatch& try_catch) {
if (!ContextifyScript::InstanceOf(env, args.Holder())) {
env->ThrowTypeError(
"Script methods can only be called on script instances.");
return false;
}
ContextifyScript* wrapped_script = Unwrap<ContextifyScript>(args.Holder());
Local<UnboundScript> unbound_script =
PersistentToLocal(env->isolate(), wrapped_script->script_);
Local<Script> script = unbound_script->BindToCurrentContext();
Local<Value> result;
if (timeout != -1) {
Watchdog wd(env->isolate(), timeout);
result = script->Run();
} else {
result = script->Run();
}
if (try_catch.HasCaught() && try_catch.HasTerminated()) {
V8::CancelTerminateExecution(env->isolate());
env->ThrowError("Script execution timed out.");
try_catch.ReThrow();
return false;
}
if (result.IsEmpty()) {
// Error occurred during execution of the script.
if (display_errors) {
AppendExceptionLine(env, try_catch.Exception(), try_catch.Message());
}
try_catch.ReThrow();
return false;
}
args.GetReturnValue().Set(result);
return true;
}
ContextifyScript(Environment* env, Local<Object> object)
: BaseObject(env, object) {
MakeWeak<ContextifyScript>(this);
}
~ContextifyScript() override {
script_.Reset();
}
};
void InitContextify(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
Environment* env = Environment::GetCurrent(context);
ContextifyContext::Init(env, target);
ContextifyScript::Init(env, target);
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(contextify, node::InitContextify);