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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsJSConfigTriggers.h"
#include "jsapi.h"
#include "nsIXPConnect.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nspr.h"
#include "mozilla/Attributes.h"
#include "mozilla/Maybe.h"
#include "mozilla/NullPrincipal.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/ChromeUtilsBinding.h"
#include "nsContentUtils.h"
#include "nsJSPrincipals.h"
#include "nsIScriptError.h"
#include "js/PropertyAndElement.h" // JS_DefineProperty
#include "js/Wrapper.h"
#include "mozilla/Utf8.h"
extern mozilla::LazyLogModule MCD;
using mozilla::AutoSafeJSContext;
using mozilla::IsUtf8;
using mozilla::NullPrincipal;
using mozilla::dom::AutoJSAPI;
//*****************************************************************************
static JS::PersistentRooted<JSObject*> autoconfigSystemSb;
static JS::PersistentRooted<JSObject*> autoconfigSb;
bool sandboxEnabled;
nsresult CentralizedAdminPrefManagerInit(bool aSandboxEnabled) {
// If the sandbox is already created, no need to create it again.
if (autoconfigSb.initialized()) return NS_OK;
sandboxEnabled = aSandboxEnabled;
// Grab XPConnect.
nsCOMPtr<nsIXPConnect> xpc = nsIXPConnect::XPConnect();
// Grab the system principal.
nsCOMPtr<nsIPrincipal> principal;
nsContentUtils::GetSecurityManager()->GetSystemPrincipal(
getter_AddRefs(principal));
// Create a sandbox.
AutoSafeJSContext cx;
JS::Rooted<JSObject*> sandbox(cx);
nsresult rv = xpc->CreateSandbox(cx, principal, sandbox.address());
NS_ENSURE_SUCCESS(rv, rv);
// Unwrap, store and root the sandbox.
NS_ENSURE_STATE(sandbox);
autoconfigSystemSb.init(cx, js::UncheckedUnwrap(sandbox));
// Create an unprivileged sandbox.
principal = NullPrincipal::CreateWithoutOriginAttributes();
rv = xpc->CreateSandbox(cx, principal, sandbox.address());
NS_ENSURE_SUCCESS(rv, rv);
autoconfigSb.init(cx, js::UncheckedUnwrap(sandbox));
// Define gSandbox on system sandbox.
JSAutoRealm ar(cx, autoconfigSystemSb);
JS::Rooted<JS::Value> value(cx, JS::ObjectValue(*sandbox));
if (!JS_WrapValue(cx, &value) ||
!JS_DefineProperty(cx, autoconfigSystemSb, "gSandbox", value,
JSPROP_ENUMERATE)) {
return NS_ERROR_FAILURE;
}
// Define ChromeUtils for ChromeUtils.import.
if (!mozilla::dom::ChromeUtils_Binding::GetConstructorObject(cx)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult CentralizedAdminPrefManagerFinish() {
if (autoconfigSb.initialized()) {
AutoSafeJSContext cx;
autoconfigSb.reset();
autoconfigSystemSb.reset();
JS_MaybeGC(cx);
}
return NS_OK;
}
nsresult EvaluateAdminConfigScript(const char* js_buffer, size_t length,
const char* filename, bool globalContext,
bool callbacks, bool skipFirstLine,
bool isPrivileged) {
if (!sandboxEnabled) {
isPrivileged = true;
}
return EvaluateAdminConfigScript(
isPrivileged ? autoconfigSystemSb : autoconfigSb, js_buffer, length,
filename, globalContext, callbacks, skipFirstLine);
}
nsresult EvaluateAdminConfigScript(JS::Handle<JSObject*> sandbox,
const char* js_buffer, size_t length,
const char* filename, bool globalContext,
bool callbacks, bool skipFirstLine) {
if (skipFirstLine) {
/* In order to protect the privacy of the JavaScript preferences file
* from loading by the browser, we make the first line unparseable
* by JavaScript. We must skip that line here before executing
* the JavaScript code.
*/
unsigned int i = 0;
while (i < length) {
char c = js_buffer[i++];
if (c == '\r') {
if (js_buffer[i] == '\n') i++;
break;
}
if (c == '\n') break;
}
length -= i;
js_buffer += i;
}
// Grab XPConnect.
nsCOMPtr<nsIXPConnect> xpc = nsIXPConnect::XPConnect();
AutoJSAPI jsapi;
if (!jsapi.Init(sandbox)) {
return NS_ERROR_UNEXPECTED;
}
JSContext* cx = jsapi.cx();
nsAutoCString script(js_buffer, length);
JS::Rooted<JS::Value> v(cx);
nsString convertedScript;
bool isUTF8 = IsUtf8(script);
if (isUTF8) {
CopyUTF8toUTF16(script, convertedScript);
} else {
nsContentUtils::ReportToConsoleNonLocalized(
nsLiteralString(
u"Your AutoConfig file is ASCII. Please convert it to UTF-8."),
nsIScriptError::warningFlag, "autoconfig"_ns, nullptr);
/* If the length is 0, the conversion failed. Fallback to ASCII */
convertedScript = NS_ConvertASCIItoUTF16(script);
}
{
JSAutoRealm ar(cx, autoconfigSystemSb);
JS::Rooted<JS::Value> value(cx, JS::BooleanValue(isUTF8));
if (!JS_DefineProperty(cx, autoconfigSystemSb, "gIsUTF8", value,
JSPROP_ENUMERATE)) {
return NS_ERROR_UNEXPECTED;
}
}
nsresult rv =
xpc->EvalInSandboxObject(convertedScript, filename, cx, sandbox, &v);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
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