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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "chrome/browser/nacl_host/nacl_file_host.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/file_util.h" | |
| 9 #include "base/files/file_path.h" | |
| 10 #include "base/path_service.h" | |
| 11 #include "base/platform_file.h" | |
| 12 #include "base/strings/utf_string_conversions.h" | |
| 13 #include "base/threading/sequenced_worker_pool.h" | |
| 14 #include "chrome/browser/nacl_host/nacl_host_message_filter.h" | |
| 15 #include "components/nacl/browser/nacl_browser.h" | |
| 16 #include "components/nacl/browser/nacl_browser_delegate.h" | |
| 17 #include "components/nacl/common/nacl_host_messages.h" | |
| 18 #include "content/public/browser/browser_thread.h" | |
| 19 #include "content/public/browser/render_view_host.h" | |
| 20 #include "content/public/browser/site_instance.h" | |
| 21 #include "ipc/ipc_platform_file.h" | |
| 22 | |
| 23 using content::BrowserThread; | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 // Force a prefix to prevent user from opening "magic" files. | |
| 28 const char* kExpectedFilePrefix = "pnacl_public_"; | |
| 29 | |
| 30 // Restrict PNaCl file lengths to reduce likelyhood of hitting bugs | |
| 31 // in file name limit error-handling-code-paths, etc. | |
| 32 const size_t kMaxFileLength = 40; | |
| 33 | |
| 34 void NotifyRendererOfError( | |
| 35 NaClHostMessageFilter* nacl_host_message_filter, | |
| 36 IPC::Message* reply_msg) { | |
| 37 reply_msg->set_reply_error(); | |
| 38 nacl_host_message_filter->Send(reply_msg); | |
| 39 } | |
| 40 | |
| 41 bool PnaclDoOpenFile(const base::FilePath& file_to_open, | |
| 42 base::PlatformFile* out_file) { | |
| 43 base::PlatformFileError error_code; | |
| 44 *out_file = base::CreatePlatformFile(file_to_open, | |
| 45 base::PLATFORM_FILE_OPEN | | |
| 46 base::PLATFORM_FILE_READ, | |
| 47 NULL, | |
| 48 &error_code); | |
| 49 if (error_code != base::PLATFORM_FILE_OK) { | |
| 50 return false; | |
| 51 } | |
| 52 return true; | |
| 53 } | |
| 54 | |
| 55 void DoOpenPnaclFile( | |
| 56 scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter, | |
| 57 const std::string& filename, | |
| 58 IPC::Message* reply_msg) { | |
| 59 DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread()); | |
| 60 base::FilePath full_filepath; | |
| 61 | |
| 62 // PNaCl must be installed. | |
| 63 base::FilePath pnacl_dir; | |
| 64 if (!nacl::NaClBrowser::GetDelegate()->GetPnaclDirectory(&pnacl_dir) || | |
| 65 !base::PathExists(pnacl_dir)) { | |
| 66 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 67 return; | |
| 68 } | |
| 69 | |
| 70 // Do some validation. | |
| 71 if (!nacl_file_host::PnaclCanOpenFile(filename, &full_filepath)) { | |
| 72 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 73 return; | |
| 74 } | |
| 75 | |
| 76 base::PlatformFile file_to_open; | |
| 77 if (!PnaclDoOpenFile(full_filepath, &file_to_open)) { | |
| 78 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 79 return; | |
| 80 } | |
| 81 | |
| 82 // Send the reply! | |
| 83 // Do any DuplicateHandle magic that is necessary first. | |
| 84 IPC::PlatformFileForTransit target_desc = | |
| 85 IPC::GetFileHandleForProcess(file_to_open, | |
| 86 nacl_host_message_filter->PeerHandle(), | |
| 87 true /* Close source */); | |
| 88 if (target_desc == IPC::InvalidPlatformFileForTransit()) { | |
| 89 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 90 return; | |
| 91 } | |
| 92 NaClHostMsg_GetReadonlyPnaclFD::WriteReplyParams( | |
| 93 reply_msg, target_desc); | |
| 94 nacl_host_message_filter->Send(reply_msg); | |
| 95 } | |
| 96 | |
| 97 void DoRegisterOpenedNaClExecutableFile( | |
| 98 scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter, | |
| 99 base::PlatformFile file, | |
| 100 base::FilePath file_path, | |
| 101 IPC::Message* reply_msg) { | |
| 102 // IO thread owns the NaClBrowser singleton. | |
| 103 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); | |
| 104 | |
| 105 nacl::NaClBrowser* nacl_browser = nacl::NaClBrowser::GetInstance(); | |
| 106 uint64 file_token_lo = 0; | |
| 107 uint64 file_token_hi = 0; | |
| 108 nacl_browser->PutFilePath(file_path, &file_token_lo, &file_token_hi); | |
| 109 | |
| 110 IPC::PlatformFileForTransit file_desc = IPC::GetFileHandleForProcess( | |
| 111 file, | |
| 112 nacl_host_message_filter->PeerHandle(), | |
| 113 true /* close_source */); | |
| 114 | |
| 115 NaClHostMsg_OpenNaClExecutable::WriteReplyParams( | |
| 116 reply_msg, file_desc, file_token_lo, file_token_hi); | |
| 117 nacl_host_message_filter->Send(reply_msg); | |
| 118 } | |
| 119 | |
| 120 // Convert the file URL into a file descriptor. | |
| 121 // This function is security sensitive. Be sure to check with a security | |
| 122 // person before you modify it. | |
| 123 void DoOpenNaClExecutableOnThreadPool( | |
| 124 scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter, | |
| 125 const GURL& file_url, | |
| 126 IPC::Message* reply_msg) { | |
| 127 DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread()); | |
| 128 | |
| 129 base::FilePath file_path; | |
| 130 if (!nacl::NaClBrowser::GetDelegate()->MapUrlToLocalFilePath( | |
| 131 file_url, true /* use_blocking_api */, &file_path)) { | |
| 132 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 133 return; | |
| 134 } | |
| 135 | |
| 136 base::PlatformFile file; | |
| 137 nacl::OpenNaClExecutableImpl(file_path, &file); | |
| 138 if (file != base::kInvalidPlatformFileValue) { | |
| 139 // This function is running on the blocking pool, but the path needs to be | |
| 140 // registered in a structure owned by the IO thread. | |
| 141 BrowserThread::PostTask( | |
| 142 BrowserThread::IO, FROM_HERE, | |
| 143 base::Bind( | |
| 144 &DoRegisterOpenedNaClExecutableFile, | |
| 145 nacl_host_message_filter, | |
| 146 file, file_path, reply_msg)); | |
| 147 } else { | |
| 148 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 149 return; | |
| 150 } | |
| 151 } | |
| 152 | |
| 153 } // namespace | |
| 154 | |
| 155 namespace nacl_file_host { | |
| 156 | |
| 157 void GetReadonlyPnaclFd( | |
| 158 scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter, | |
| 159 const std::string& filename, | |
| 160 IPC::Message* reply_msg) { | |
| 161 if (!BrowserThread::PostBlockingPoolTask( | |
| 162 FROM_HERE, | |
| 163 base::Bind(&DoOpenPnaclFile, | |
| 164 nacl_host_message_filter, | |
| 165 filename, | |
| 166 reply_msg))) { | |
| 167 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 // This function is security sensitive. Be sure to check with a security | |
| 172 // person before you modify it. | |
| 173 bool PnaclCanOpenFile(const std::string& filename, | |
| 174 base::FilePath* file_to_open) { | |
| 175 if (filename.length() > kMaxFileLength) | |
| 176 return false; | |
| 177 | |
| 178 if (filename.empty()) | |
| 179 return false; | |
| 180 | |
| 181 // Restrict character set of the file name to something really simple | |
| 182 // (a-z, 0-9, and underscores). | |
| 183 for (size_t i = 0; i < filename.length(); ++i) { | |
| 184 char charAt = filename[i]; | |
| 185 if (charAt < 'a' || charAt > 'z') | |
| 186 if (charAt < '0' || charAt > '9') | |
| 187 if (charAt != '_') | |
| 188 return false; | |
| 189 } | |
| 190 | |
| 191 // PNaCl must be installed. | |
| 192 base::FilePath pnacl_dir; | |
| 193 if (!nacl::NaClBrowser::GetDelegate()->GetPnaclDirectory(&pnacl_dir) || | |
| 194 pnacl_dir.empty()) | |
| 195 return false; | |
| 196 | |
| 197 // Prepend the prefix to restrict files to a whitelisted set. | |
| 198 base::FilePath full_path = pnacl_dir.AppendASCII( | |
| 199 std::string(kExpectedFilePrefix) + filename); | |
| 200 *file_to_open = full_path; | |
| 201 return true; | |
| 202 } | |
| 203 | |
| 204 void OpenNaClExecutable( | |
| 205 scoped_refptr<NaClHostMessageFilter> nacl_host_message_filter, | |
| 206 int render_view_id, | |
| 207 const GURL& file_url, | |
| 208 IPC::Message* reply_msg) { | |
| 209 if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) { | |
| 210 BrowserThread::PostTask( | |
| 211 BrowserThread::UI, FROM_HERE, | |
| 212 base::Bind( | |
| 213 &OpenNaClExecutable, | |
| 214 nacl_host_message_filter, | |
| 215 render_view_id, file_url, reply_msg)); | |
| 216 return; | |
| 217 } | |
| 218 | |
| 219 // Make sure render_view_id is valid and that the URL is a part of the | |
| 220 // render view's site. Without these checks, apps could probe the extension | |
| 221 // directory or run NaCl code from other extensions. | |
| 222 content::RenderViewHost* rvh = content::RenderViewHost::FromID( | |
| 223 nacl_host_message_filter->render_process_id(), render_view_id); | |
| 224 if (!rvh) { | |
| 225 nacl_host_message_filter->BadMessageReceived(); // Kill the renderer. | |
| 226 return; | |
| 227 } | |
| 228 content::SiteInstance* site_instance = rvh->GetSiteInstance(); | |
| 229 if (!content::SiteInstance::IsSameWebSite(site_instance->GetBrowserContext(), | |
| 230 site_instance->GetSiteURL(), | |
| 231 file_url)) { | |
| 232 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 233 return; | |
| 234 } | |
| 235 | |
| 236 // The URL is part of the current app. Now query the extension system for the | |
| 237 // file path and convert that to a file descriptor. This should be done on a | |
| 238 // blocking pool thread. | |
| 239 if (!BrowserThread::PostBlockingPoolTask( | |
| 240 FROM_HERE, | |
| 241 base::Bind( | |
| 242 &DoOpenNaClExecutableOnThreadPool, | |
| 243 nacl_host_message_filter, | |
| 244 file_url, reply_msg))) { | |
| 245 NotifyRendererOfError(nacl_host_message_filter.get(), reply_msg); | |
| 246 } | |
| 247 } | |
| 248 | |
| 249 } // namespace nacl_file_host | |
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Chromium Code Reviews
Issue 75463005:
Move more files from chrome/browser/nacl_host/ to components/nacl/browser/ (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src