1 files changed, 163 insertions, 0 deletions
diff --git a/extensions/pref/autoconfig/src/nsJSConfigTriggers.cpp b/extensions/pref/autoconfig/src/nsJSConfigTriggers.cpp
new file mode 100644
index 0000000000..4b2334ae2b
--- /dev/null
+++ b/extensions/pref/autoconfig/src/nsJSConfigTriggers.cpp
@@ -0,0 +1,163 @@
+/* -*- 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 "nsContentUtils.h"
+#include "nsJSPrincipals.h"
+#include "nsIScriptError.h"
+#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;
+static 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;
+  }
+
+  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::HandleObject 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::RootedValue 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;
+}