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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/ipc/IOThreadChild.h"
#include "ContentProcess.h"
#include "base/shared_memory.h"
#include "mozilla/Preferences.h"
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
# include <stdlib.h>
# include "mozilla/Sandbox.h"
#endif
#if (defined(XP_WIN) || defined(XP_MACOSX)) && defined(MOZ_SANDBOX)
# include "mozilla/SandboxSettings.h"
# include "nsAppDirectoryServiceDefs.h"
# include "nsDirectoryService.h"
# include "nsDirectoryServiceDefs.h"
#endif
#include "nsAppRunner.h"
#include "ProcessUtils.h"
using mozilla::ipc::IOThreadChild;
namespace mozilla::dom {
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
static void SetTmpEnvironmentVariable(nsIFile* aValue) {
// Save the TMP environment variable so that is is picked up by GetTempPath().
// Note that we specifically write to the TMP variable, as that is the first
// variable that is checked by GetTempPath() to determine its output.
nsAutoString fullTmpPath;
nsresult rv = aValue->GetPath(fullTmpPath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TMP", fullTmpPath.get()));
// We also set TEMP in case there is naughty third-party code that is
// referencing the environment variable directly.
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TEMP", fullTmpPath.get()));
}
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
static void SetUpSandboxEnvironment() {
MOZ_ASSERT(
nsDirectoryService::gService,
"SetUpSandboxEnvironment relies on nsDirectoryService being initialized");
// On Windows, a sandbox-writable temp directory is used whenever the sandbox
// is enabled.
if (!IsContentSandboxEnabled()) {
return;
}
nsCOMPtr<nsIFile> sandboxedContentTemp;
nsresult rv = nsDirectoryService::gService->Get(
NS_APP_CONTENT_PROCESS_TEMP_DIR, NS_GET_IID(nsIFile),
getter_AddRefs(sandboxedContentTemp));
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// Change the gecko defined temp directory to our sandbox-writable one.
// Undefine returns a failure if the property is not already set.
Unused << nsDirectoryService::gService->Undefine(NS_OS_TEMP_DIR);
rv = nsDirectoryService::gService->Set(NS_OS_TEMP_DIR, sandboxedContentTemp);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
SetTmpEnvironmentVariable(sandboxedContentTemp);
}
#endif
bool ContentProcess::Init(int aArgc, char* aArgv[]) {
Maybe<uint64_t> childID;
Maybe<bool> isForBrowser;
Maybe<const char*> parentBuildID;
char* prefsHandle = nullptr;
char* prefMapHandle = nullptr;
char* prefsLen = nullptr;
char* prefMapSize = nullptr;
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
nsCOMPtr<nsIFile> profileDir;
#endif
for (int i = 1; i < aArgc; i++) {
if (!aArgv[i]) {
continue;
}
if (strcmp(aArgv[i], "-appdir") == 0) {
if (++i == aArgc) {
return false;
}
nsDependentCString appDir(aArgv[i]);
mXREEmbed.SetAppDir(appDir);
} else if (strcmp(aArgv[i], "-childID") == 0) {
if (++i == aArgc) {
return false;
}
char* str = aArgv[i];
childID = Some(strtoull(str, &str, 10));
if (str[0] != '\0') {
return false;
}
} else if (strcmp(aArgv[i], "-isForBrowser") == 0) {
isForBrowser = Some(true);
} else if (strcmp(aArgv[i], "-notForBrowser") == 0) {
isForBrowser = Some(false);
#ifdef XP_WIN
} else if (strcmp(aArgv[i], "-prefsHandle") == 0) {
if (++i == aArgc) {
return false;
}
prefsHandle = aArgv[i];
} else if (strcmp(aArgv[i], "-prefMapHandle") == 0) {
if (++i == aArgc) {
return false;
}
prefMapHandle = aArgv[i];
#endif
} else if (strcmp(aArgv[i], "-prefsLen") == 0) {
if (++i == aArgc) {
return false;
}
prefsLen = aArgv[i];
} else if (strcmp(aArgv[i], "-prefMapSize") == 0) {
if (++i == aArgc) {
return false;
}
prefMapSize = aArgv[i];
} else if (strcmp(aArgv[i], "-safeMode") == 0) {
gSafeMode = true;
} else if (strcmp(aArgv[i], "-parentBuildID") == 0) {
if (++i == aArgc) {
return false;
}
parentBuildID = Some(aArgv[i]);
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
} else if (strcmp(aArgv[i], "-profile") == 0) {
if (++i == aArgc) {
return false;
}
bool flag;
nsresult rv = XRE_GetFileFromPath(aArgv[i], getter_AddRefs(profileDir));
if (NS_FAILED(rv) || NS_FAILED(profileDir->Exists(&flag)) || !flag) {
NS_WARNING("Invalid profile directory passed to content process.");
profileDir = nullptr;
}
#endif /* XP_MACOSX && MOZ_SANDBOX */
}
}
// Did we find all the mandatory flags?
if (childID.isNothing() || isForBrowser.isNothing() ||
parentBuildID.isNothing()) {
return false;
}
::mozilla::ipc::SharedPreferenceDeserializer deserializer;
if (!deserializer.DeserializeFromSharedMemory(prefsHandle, prefMapHandle,
prefsLen, prefMapSize)) {
return false;
}
mContent.Init(IOThreadChild::message_loop(), ParentPid(), *parentBuildID,
IOThreadChild::TakeChannel(), *childID, *isForBrowser);
mXREEmbed.Start();
#if (defined(XP_MACOSX)) && defined(MOZ_SANDBOX)
mContent.SetProfileDir(profileDir);
# if defined(DEBUG)
if (IsContentSandboxEnabled()) {
AssertMacSandboxEnabled();
}
# endif /* DEBUG */
#endif /* XP_MACOSX && MOZ_SANDBOX */
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
SetUpSandboxEnvironment();
#endif
return true;
}
// Note: CleanUp() never gets called in non-debug builds because we exit early
// in ContentChild::ActorDestroy().
void ContentProcess::CleanUp() { mXREEmbed.Stop(); }
} // namespace mozilla::dom
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