diff options
Diffstat (limited to 'chromium/components/nacl/browser/nacl_file_host.cc')
| -rw-r--r-- | chromium/components/nacl/browser/nacl_file_host.cc | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/chromium/components/nacl/browser/nacl_file_host.cc b/chromium/components/nacl/browser/nacl_file_host.cc deleted file mode 100644 index 80eab39e37b..00000000000 --- a/chromium/components/nacl/browser/nacl_file_host.cc +++ /dev/null @@ -1,248 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -#include "components/nacl/browser/nacl_file_host.h" - -#include "base/bind.h" -#include "base/file_util.h" -#include "base/files/file_path.h" -#include "base/path_service.h" -#include "base/platform_file.h" -#include "base/strings/utf_string_conversions.h" -#include "base/threading/sequenced_worker_pool.h" -#include "components/nacl/browser/nacl_browser.h" -#include "components/nacl/browser/nacl_browser_delegate.h" -#include "components/nacl/browser/nacl_host_message_filter.h" -#include "components/nacl/common/nacl_host_messages.h" -#include "content/public/browser/browser_thread.h" -#include "content/public/browser/render_view_host.h" -#include "content/public/browser/site_instance.h" -#include "ipc/ipc_platform_file.h" - -using content::BrowserThread; - -namespace { - -// Force a prefix to prevent user from opening "magic" files. -const char* kExpectedFilePrefix = "pnacl_public_"; - -// Restrict PNaCl file lengths to reduce likelyhood of hitting bugs -// in file name limit error-handling-code-paths, etc. -const size_t kMaxFileLength = 40; - -void NotifyRendererOfError( - nacl::NaClHostMessageFilter* nacl_host_message_filter, - IPC::Message* reply_msg) { - reply_msg->set_reply_error(); - nacl_host_message_filter->Send(reply_msg); -} - -bool PnaclDoOpenFile(const base::FilePath& file_to_open, - base::PlatformFile* out_file) { - base::PlatformFileError error_code; - *out_file = base::CreatePlatformFile(file_to_open, - base::PLATFORM_FILE_OPEN | - base::PLATFORM_FILE_READ, - NULL, - &error_code); - if (error_code != base::PLATFORM_FILE_OK) { - return false; - } - return true; -} - -void DoOpenPnaclFile( - scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter, - const std::string& filename, - IPC::Message* reply_msg) { - DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread()); - base::FilePath full_filepath; - - // PNaCl must be installed. - base::FilePath pnacl_dir; - if (!nacl::NaClBrowser::GetDelegate()->GetPnaclDirectory(&pnacl_dir) || - !base::PathExists(pnacl_dir)) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - - // Do some validation. - if (!nacl_file_host::PnaclCanOpenFile(filename, &full_filepath)) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - - base::PlatformFile file_to_open; - if (!PnaclDoOpenFile(full_filepath, &file_to_open)) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - - // Send the reply! - // Do any DuplicateHandle magic that is necessary first. - IPC::PlatformFileForTransit target_desc = - IPC::GetFileHandleForProcess(file_to_open, - nacl_host_message_filter->PeerHandle(), - true /* Close source */); - if (target_desc == IPC::InvalidPlatformFileForTransit()) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - NaClHostMsg_GetReadonlyPnaclFD::WriteReplyParams( - reply_msg, target_desc); - nacl_host_message_filter->Send(reply_msg); -} - -void DoRegisterOpenedNaClExecutableFile( - scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter, - base::PlatformFile file, - base::FilePath file_path, - IPC::Message* reply_msg) { - // IO thread owns the NaClBrowser singleton. - DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); - - nacl::NaClBrowser* nacl_browser = nacl::NaClBrowser::GetInstance(); - uint64 file_token_lo = 0; - uint64 file_token_hi = 0; - nacl_browser->PutFilePath(file_path, &file_token_lo, &file_token_hi); - - IPC::PlatformFileForTransit file_desc = IPC::GetFileHandleForProcess( - file, - nacl_host_message_filter->PeerHandle(), - true /* close_source */); - - NaClHostMsg_OpenNaClExecutable::WriteReplyParams( - reply_msg, file_desc, file_token_lo, file_token_hi); - nacl_host_message_filter->Send(reply_msg); -} - -// Convert the file URL into a file descriptor. -// This function is security sensitive. Be sure to check with a security -// person before you modify it. -void DoOpenNaClExecutableOnThreadPool( - scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter, - const GURL& file_url, - IPC::Message* reply_msg) { - DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread()); - - base::FilePath file_path; - if (!nacl::NaClBrowser::GetDelegate()->MapUrlToLocalFilePath( - file_url, true /* use_blocking_api */, &file_path)) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - - base::PlatformFile file = nacl::OpenNaClExecutableImpl(file_path); - if (file != base::kInvalidPlatformFileValue) { - // This function is running on the blocking pool, but the path needs to be - // registered in a structure owned by the IO thread. - BrowserThread::PostTask( - BrowserThread::IO, FROM_HERE, - base::Bind( - &DoRegisterOpenedNaClExecutableFile, - nacl_host_message_filter, - file, file_path, reply_msg)); - } else { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } -} - -} // namespace - -namespace nacl_file_host { - -void GetReadonlyPnaclFd( - scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter, - const std::string& filename, - IPC::Message* reply_msg) { - if (!BrowserThread::PostBlockingPoolTask( - FROM_HERE, - base::Bind(&DoOpenPnaclFile, - nacl_host_message_filter, - filename, - reply_msg))) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - } -} - -// This function is security sensitive. Be sure to check with a security -// person before you modify it. -bool PnaclCanOpenFile(const std::string& filename, - base::FilePath* file_to_open) { - if (filename.length() > kMaxFileLength) - return false; - - if (filename.empty()) - return false; - - // Restrict character set of the file name to something really simple - // (a-z, 0-9, and underscores). - for (size_t i = 0; i < filename.length(); ++i) { - char charAt = filename[i]; - if (charAt < 'a' || charAt > 'z') - if (charAt < '0' || charAt > '9') - if (charAt != '_') - return false; - } - - // PNaCl must be installed. - base::FilePath pnacl_dir; - if (!nacl::NaClBrowser::GetDelegate()->GetPnaclDirectory(&pnacl_dir) || - pnacl_dir.empty()) - return false; - - // Prepend the prefix to restrict files to a whitelisted set. - base::FilePath full_path = pnacl_dir.AppendASCII( - std::string(kExpectedFilePrefix) + filename); - *file_to_open = full_path; - return true; -} - -void OpenNaClExecutable( - scoped_refptr<nacl::NaClHostMessageFilter> nacl_host_message_filter, - int render_view_id, - const GURL& file_url, - IPC::Message* reply_msg) { - if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) { - BrowserThread::PostTask( - BrowserThread::UI, FROM_HERE, - base::Bind( - &OpenNaClExecutable, - nacl_host_message_filter, - render_view_id, file_url, reply_msg)); - return; - } - - // Make sure render_view_id is valid and that the URL is a part of the - // render view's site. Without these checks, apps could probe the extension - // directory or run NaCl code from other extensions. - content::RenderViewHost* rvh = content::RenderViewHost::FromID( - nacl_host_message_filter->render_process_id(), render_view_id); - if (!rvh) { - nacl_host_message_filter->BadMessageReceived(); // Kill the renderer. - return; - } - content::SiteInstance* site_instance = rvh->GetSiteInstance(); - if (!content::SiteInstance::IsSameWebSite(site_instance->GetBrowserContext(), - site_instance->GetSiteURL(), - file_url)) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - return; - } - - // The URL is part of the current app. Now query the extension system for the - // file path and convert that to a file descriptor. This should be done on a - // blocking pool thread. - if (!BrowserThread::PostBlockingPoolTask( - FROM_HERE, - base::Bind( - &DoOpenNaClExecutableOnThreadPool, - nacl_host_message_filter, - file_url, reply_msg))) { - NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); - } -} - -} // namespace nacl_file_host |