Bug 1324064: Stop accessing printer devices in the child when printing via parent. r=jimm

This should remove all access to printer devices on Windows, there might by some other OS specific code which still does.

embedding/components/printingui/ipc/PPrinting.ipdl

@@ -29,7 +29,7 @@ parent:
             nsresult rv);
 
   async ShowPrintDialog(PPrintSettingsDialog dialog,
-                        PBrowser browser,
+                        nullable PBrowser browser,
                         PrintData settings);
 
   async PPrintProgressDialog();

embedding/components/printingui/ipc/PrintingParent.cpp

@@ -84,9 +84,15 @@ PrintingParent::ShowPrintDialog(PBrowserParent* aParent,
                                 const PrintData& aData,
                                 PrintData* aResult)
 {
-  nsCOMPtr<nsPIDOMWindowOuter> parentWin = DOMWindowFromBrowserParent(aParent);
-  if (!parentWin) {
-    return NS_ERROR_FAILURE;
+  // If aParent is null this call is just being used to get print settings from
+  // the printer for print preview.
+  bool isPrintPreview = !aParent;
+  nsCOMPtr<nsPIDOMWindowOuter> parentWin;
+  if (aParent) {
+    parentWin = DOMWindowFromBrowserParent(aParent);
+    if (!parentWin) {
+      return NS_ERROR_FAILURE;
+    }
   }
 
   nsCOMPtr<nsIPrintingPromptService> pps(do_GetService("@mozilla.org/embedcomp/printingprompt-service;1"));
@@ -123,9 +129,9 @@ PrintingParent::ShowPrintDialog(PBrowserParent* aParent,
   rv = settings->SetPrintSilent(printSilently);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  // If we are printing silently then we just need to initialize the print
-  // settings with anything specific from the printer.
-  if (printSilently ||
+  // If this is for print preview or we are printing silently then we just need
+  // to initialize the print settings with anything specific from the printer.
+  if (isPrintPreview || printSilently ||
       Preferences::GetBool("print.always_print_silent", printSilently)) {
     nsXPIDLString printerName;
     rv = settings->GetPrinterName(getter_Copies(printerName));
@@ -138,8 +144,13 @@ PrintingParent::ShowPrintDialog(PBrowserParent* aParent,
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
-  rv = SerializeAndEnsureRemotePrintJob(settings, nullptr, remotePrintJob,
-                                        aResult);
+  if (isPrintPreview) {
+    // For print preview we don't want a RemotePrintJob just the settings.
+    rv = mPrintSettingsSvc->SerializeToPrintData(settings, nullptr, aResult);
+  } else {
+    rv = SerializeAndEnsureRemotePrintJob(settings, nullptr, remotePrintJob,
+                                          aResult);
+  }
 
   return rv;
 }

embedding/components/printingui/ipc/nsPrintingProxy.cpp

@@ -72,21 +72,25 @@ nsPrintingProxy::ShowPrintDialog(mozIDOMWindowProxy *parent,
                                  nsIWebBrowserPrint *webBrowserPrint,
                                  nsIPrintSettings *printSettings)
 {
-  NS_ENSURE_ARG(parent);
   NS_ENSURE_ARG(webBrowserPrint);
   NS_ENSURE_ARG(printSettings);
 
-  // Get the TabChild for this nsIDOMWindow, which we can then pass up to
-  // the parent.
-  nsCOMPtr<nsPIDOMWindowOuter> pwin = nsPIDOMWindowOuter::From(parent);
-  NS_ENSURE_STATE(pwin);
-  nsCOMPtr<nsIDocShell> docShell = pwin->GetDocShell();
-  NS_ENSURE_STATE(docShell);
+  // If parent is null we are just being called to retrieve the print settings
+  // from the printer in the parent for print preview.
+  TabChild* pBrowser = nullptr;
+  if (parent) {
+    // Get the TabChild for this nsIDOMWindow, which we can then pass up to
+    // the parent.
+    nsCOMPtr<nsPIDOMWindowOuter> pwin = nsPIDOMWindowOuter::From(parent);
+    NS_ENSURE_STATE(pwin);
+    nsCOMPtr<nsIDocShell> docShell = pwin->GetDocShell();
+    NS_ENSURE_STATE(docShell);
 
-  nsCOMPtr<nsITabChild> tabchild = docShell->GetTabChild();
-  NS_ENSURE_STATE(tabchild);
+    nsCOMPtr<nsITabChild> tabchild = docShell->GetTabChild();
+    NS_ENSURE_STATE(tabchild);
 
-  TabChild* pBrowser = static_cast<TabChild*>(tabchild.get());
+    pBrowser = static_cast<TabChild*>(tabchild.get());
+  }
 
   // Next, serialize the nsIWebBrowserPrint and nsIPrintSettings we were given.
   nsresult rv = NS_OK;

layout/printing/nsPrintEngine.cpp

@@ -562,7 +562,11 @@ nsPrintEngine::DoCommonPrint(bool                    aIsPrintPreview,
   }
 
   nsScriptSuppressor scriptSuppressor(this);
-  if (!aIsPrintPreview) {
+  // If printing via parent we still call ShowPrintDialog even for print preview
+  // because we use that to retrieve the print settings from the printer.
+  // The dialog is not shown, but this means we don't need to access the printer
+  // driver from the child, which causes sandboxing issues.
+  if (!aIsPrintPreview || printingViaParent) {
 #ifdef DEBUG
     mPrt->mDebugFilePtr = mDebugFile;
 #endif
@@ -583,8 +587,12 @@ nsPrintEngine::DoCommonPrint(bool                    aIsPrintPreview,
     if (!printSilently || printingViaParent) {
       nsCOMPtr<nsIPrintingPromptService> printPromptService(do_GetService(kPrintingPromptService));
       if (printPromptService) {
-        nsPIDOMWindowOuter* domWin = mDocument->GetWindow(); 
-        NS_ENSURE_TRUE(domWin, NS_ERROR_FAILURE);
+        nsPIDOMWindowOuter* domWin = nullptr;
+        // We leave domWin as nullptr to indicate a call for print preview.
+        if (!aIsPrintPreview) {
+          domWin = mDocument->GetWindow();
+          NS_ENSURE_TRUE(domWin, NS_ERROR_FAILURE);
+        }
 
         // Platforms not implementing a given dialog for the service may
         // return NS_ERROR_NOT_IMPLEMENTED or an error code.
@@ -608,7 +616,7 @@ nsPrintEngine::DoCommonPrint(bool                    aIsPrintPreview,
           // are telling GFX we want to print silent
           printSilently = true;
 
-          if (mPrt->mPrintSettings) {
+          if (mPrt->mPrintSettings && !aIsPrintPreview) {
             // The user might have changed shrink-to-fit in the print dialog, so update our copy of its state
             mPrt->mPrintSettings->GetShrinkToFit(&mPrt->mShrinkToFit);
 

widget/nsDeviceContextSpecProxy.cpp

@@ -39,7 +39,7 @@ nsDeviceContextSpecProxy::Init(nsIWidget* aWidget,
     return rv;
   }
 
-  mRealDeviceContextSpec->Init(nullptr, aPrintSettings, false);
+  mRealDeviceContextSpec->Init(nullptr, aPrintSettings, aIsPrintPreview);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     mRealDeviceContextSpec = nullptr;
     return rv;

widget/nsPrintOptionsImpl.cpp

@@ -1030,6 +1030,12 @@ NS_IMETHODIMP
 nsPrintOptions::InitPrintSettingsFromPrinter(const char16_t *aPrinterName,
                                              nsIPrintSettings *aPrintSettings)
 {
+  // Don't get print settings from the printer in the child when printing via
+  // parent, these will be retrieved in the parent later in the print process.
+  if (XRE_IsContentProcess() && Preferences::GetBool("print.print_via_parent")) {
+    return NS_OK;
+  }
+
   NS_ENSURE_ARG_POINTER(aPrintSettings);
   NS_ENSURE_ARG_POINTER(aPrinterName);
 

widget/windows/nsDeviceContextSpecWin.cpp

@@ -3,13 +3,15 @@
  * 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 "nsDeviceContextSpecWin.h"
+
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/gfx/PrintTargetPDF.h"
 #include "mozilla/gfx/PrintTargetWindows.h"
 #include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
 #include "mozilla/RefPtr.h"
 
-#include "nsDeviceContextSpecWin.h"
 #include "prmem.h"
 
 #include <winspool.h>
@@ -34,7 +36,6 @@
 
 #include "mozilla/gfx/Logging.h"
 
-#include "mozilla/Logging.h"
 static mozilla::LazyLogModule kWidgetPrintingLogMod("printing-widget");
 #define PR_PL(_p1)  MOZ_LOG(kWidgetPrintingLogMod, mozilla::LogLevel::Debug, _p1)
 
@@ -132,6 +133,15 @@ NS_IMETHODIMP nsDeviceContextSpecWin::Init(nsIWidget* aWidget,
 
   nsresult rv = NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE;
   if (aPrintSettings) {
+    // If we're in the child and printing via the parent or we're printing to
+    // PDF we only need information from the print settings.
+    mPrintSettings->GetOutputFormat(&mOutputFormat);
+    if ((XRE_IsContentProcess() &&
+         Preferences::GetBool("print.print_via_parent")) ||
+        mOutputFormat == nsIPrintSettings::kOutputFormatPDF) {
+      return NS_OK;
+    }
+
     nsCOMPtr<nsIPrintSettingsWin> psWin(do_QueryInterface(aPrintSettings));
     if (psWin) {
       char16_t* deviceName;
@@ -177,7 +187,6 @@ NS_IMETHODIMP nsDeviceContextSpecWin::Init(nsIWidget* aWidget,
   char16_t * printerName = nullptr;
   if (mPrintSettings) {
     mPrintSettings->GetPrinterName(&printerName);
-    mPrintSettings->GetOutputFormat(&mOutputFormat);
   }
 
   // If there is no name then use the default printer
@@ -441,6 +450,13 @@ nsPrinterEnumeratorWin::InitPrintSettingsFromPrinter(const char16_t *aPrinterNam
     return NS_OK;
   }
 
+  // When printing to PDF on Windows there is no associated printer driver.
+  int16_t outputFormat;
+  aPrintSettings->GetOutputFormat(&outputFormat);
+  if (outputFormat == nsIPrintSettings::kOutputFormatPDF) {
+    return NS_OK;
+  }
+
   RefPtr<nsDeviceContextSpecWin> devSpecWin = new nsDeviceContextSpecWin();
   if (!devSpecWin) return NS_ERROR_OUT_OF_MEMORY;