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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/pnacl_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/memory/ref_counted.h" | |
| 11 #include "base/path_service.h" | |
| 12 #include "base/platform_file.h" | |
| 13 #include "base/utf_string_conversions.h" | |
| 14 #include "chrome/browser/renderer_host/chrome_render_message_filter.h" | |
| 15 #include "chrome/common/chrome_paths.h" | |
| 16 #include "chrome/common/render_messages.h" | |
| 17 #include "content/public/browser/browser_thread.h" | |
| 18 #include "ipc/ipc_platform_file.h" | |
| 19 | |
| 20 using content::BrowserThread; | |
| 21 | |
| 22 namespace { | |
| 23 | |
| 24 // Force a prefix to prevent user from opening "magic" files. | |
| 25 const char* kExpectedFilePrefix = "pnacl_public_"; | |
| 26 | |
| 27 // Restrict PNaCl file lengths to reduce likelyhood of hitting bugs | |
| 28 // in file name limit error-handling-code-paths, etc. | |
| 29 const size_t kMaxFileLength = 40; | |
| 30 | |
| 31 void NotifyRendererOfError( | |
| 32 ChromeRenderMessageFilter* chrome_render_message_filter, | |
| 33 IPC::Message* reply_msg) { | |
| 34 reply_msg->set_reply_error(); | |
| 35 chrome_render_message_filter->Send(reply_msg); | |
| 36 } | |
| 37 | |
| 38 bool PnaclDoOpenFile(const base::FilePath& file_to_open, | |
| 39 base::PlatformFile* out_file) { | |
| 40 base::PlatformFileError error_code; | |
| 41 *out_file = base::CreatePlatformFile(file_to_open, | |
| 42 base::PLATFORM_FILE_OPEN | | |
| 43 base::PLATFORM_FILE_READ, | |
| 44 NULL, | |
| 45 &error_code); | |
| 46 if (error_code != base::PLATFORM_FILE_OK) { | |
| 47 return false; | |
| 48 } | |
| 49 return true; | |
| 50 } | |
| 51 | |
| 52 void DoOpenPnaclFile( | |
| 53 ChromeRenderMessageFilter* chrome_render_message_filter, | |
| 54 const std::string& filename, | |
| 55 IPC::Message* reply_msg) { | |
| 56 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
| 57 base::FilePath full_filepath; | |
| 58 | |
| 59 // Do some validation. | |
| 60 if (!pnacl_file_host::PnaclCanOpenFile(filename, &full_filepath)) { | |
| 61 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 62 return; | |
| 63 } | |
| 64 | |
| 65 base::PlatformFile file_to_open; | |
| 66 if (!PnaclDoOpenFile(full_filepath, &file_to_open)) { | |
| 67 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 68 return; | |
| 69 } | |
| 70 | |
| 71 // Send the reply! | |
| 72 // Do any DuplicateHandle magic that is necessary first. | |
| 73 IPC::PlatformFileForTransit target_desc = | |
| 74 IPC::GetFileHandleForProcess(file_to_open, | |
| 75 chrome_render_message_filter->peer_handle(), | |
| 76 true /* Close source */); | |
| 77 if (target_desc == IPC::InvalidPlatformFileForTransit()) { | |
| 78 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 79 return; | |
| 80 } | |
| 81 ChromeViewHostMsg_GetReadonlyPnaclFD::WriteReplyParams( | |
| 82 reply_msg, target_desc); | |
| 83 chrome_render_message_filter->Send(reply_msg); | |
| 84 } | |
| 85 | |
| 86 void DoCreateTemporaryFile( | |
| 87 ChromeRenderMessageFilter* chrome_render_message_filter, | |
| 88 IPC::Message* reply_msg) { | |
| 89 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
| 90 | |
| 91 base::FilePath file_path; | |
| 92 if (!file_util::CreateTemporaryFile(&file_path)) { | |
| 93 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 94 return; | |
| 95 } | |
| 96 | |
| 97 base::PlatformFileError error; | |
| 98 base::PlatformFile file_handle = base::CreatePlatformFile( | |
| 99 file_path, | |
| 100 base::PLATFORM_FILE_CREATE_ALWAYS | base::PLATFORM_FILE_READ | | |
| 101 base::PLATFORM_FILE_WRITE | base::PLATFORM_FILE_TEMPORARY | | |
| 102 base::PLATFORM_FILE_DELETE_ON_CLOSE, | |
| 103 NULL, &error); | |
| 104 | |
| 105 if (error != base::PLATFORM_FILE_OK) { | |
| 106 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 107 return; | |
| 108 } | |
| 109 | |
| 110 // Send the reply! | |
| 111 // Do any DuplicateHandle magic that is necessary first. | |
| 112 IPC::PlatformFileForTransit target_desc = | |
| 113 IPC::GetFileHandleForProcess(file_handle, | |
| 114 chrome_render_message_filter->peer_handle(), | |
| 115 true); | |
| 116 if (target_desc == IPC::InvalidPlatformFileForTransit()) { | |
| 117 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 118 return; | |
| 119 } | |
| 120 | |
| 121 ChromeViewHostMsg_NaClCreateTemporaryFile::WriteReplyParams( | |
| 122 reply_msg, target_desc); | |
| 123 chrome_render_message_filter->Send(reply_msg); | |
| 124 } | |
| 125 | |
| 126 } // namespace | |
| 127 | |
| 128 namespace pnacl_file_host { | |
| 129 | |
| 130 void GetReadonlyPnaclFd( | |
| 131 ChromeRenderMessageFilter* chrome_render_message_filter, | |
| 132 const std::string& filename, | |
| 133 IPC::Message* reply_msg) { | |
| 134 if (!BrowserThread::PostTask( | |
| 135 BrowserThread::FILE, FROM_HERE, | |
| 136 base::Bind(&DoOpenPnaclFile, | |
| 137 make_scoped_refptr(chrome_render_message_filter), | |
| 138 filename, | |
| 139 reply_msg))) { | |
| 140 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // This function is security sensitive. Be sure to check with a security | |
| 145 // person before you modify it. | |
| 146 bool PnaclCanOpenFile(const std::string& filename, | |
| 147 base::FilePath* file_to_open) { | |
| 148 if (filename.length() > kMaxFileLength) | |
| 149 return false; | |
| 150 | |
| 151 if (filename.empty()) | |
| 152 return false; | |
| 153 | |
| 154 // Restrict character set of the file name to something really simple | |
| 155 // (a-z, 0-9, and underscores). | |
| 156 for (size_t i = 0; i < filename.length(); ++i) { | |
| 157 char charAt = filename[i]; | |
| 158 if (charAt < 'a' || charAt > 'z') | |
| 159 if (charAt < '0' || charAt > '9') | |
| 160 if (charAt != '_') | |
| 161 return false; | |
| 162 } | |
| 163 | |
| 164 // PNaCl must be installed. | |
| 165 base::FilePath pnacl_dir; | |
| 166 if (!PathService::Get(chrome::DIR_PNACL_COMPONENT, &pnacl_dir) || | |
| 167 pnacl_dir.empty()) | |
| 168 return false; | |
| 169 | |
| 170 // Prepend the prefix to restrict files to a whitelisted set. | |
| 171 base::FilePath full_path = pnacl_dir.AppendASCII( | |
| 172 std::string(kExpectedFilePrefix) + filename); | |
| 173 *file_to_open = full_path; | |
| 174 return true; | |
| 175 } | |
| 176 | |
| 177 void CreateTemporaryFile( | |
| 178 ChromeRenderMessageFilter* chrome_render_message_filter, | |
| 179 IPC::Message* reply_msg) { | |
| 180 if (!BrowserThread::PostTask( | |
| 181 BrowserThread::FILE, FROM_HERE, | |
| 182 base::Bind(&DoCreateTemporaryFile, | |
| 183 make_scoped_refptr(chrome_render_message_filter), | |
| 184 reply_msg))) { | |
| 185 NotifyRendererOfError(chrome_render_message_filter, reply_msg); | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 } // namespace pnacl_file_host | |
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Chromium Code Reviews
Issue 14352005:
Rename pnacl_file_host to nacl_file_host. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src