chrome/browser/download/download_extensions.cc

   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 <set>
   6 #include <string>
   7
   8 #include "chrome/browser/download/download_extensions.h"
   9
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "net/base/mime_util.h"
  13 #include "net/base/net_util.h"
  14
  15 namespace download_util {
  16
  17 // For file extensions taken from mozilla:
  18
  19 /* ***** BEGIN LICENSE BLOCK *****
  20  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  21  *
  22  * The contents of this file are subject to the Mozilla Public License Version
  23  * 1.1 (the "License"); you may not use this file except in compliance with
  24  * the License. You may obtain a copy of the License at
  25  * http://www.mozilla.org/MPL/
  26  *
  27  * Software distributed under the License is distributed on an "AS IS" basis,
  28  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  29  * for the specific language governing rights and limitations under the
  30  * License.
  31  *
  32  * The Original Code is Mozilla Communicator client code, released
  33  * March 31, 1998.
  34  *
  35  * The Initial Developer of the Original Code is
  36  * Netscape Communications Corporation.
  37  * Portions created by the Initial Developer are Copyright (C) 1998-1999
  38  * the Initial Developer. All Rights Reserved.
  39  *
  40  * Contributor(s):
  41  *   Doug Turner <dougt@netscape.com>
  42  *   Dean Tessman <dean_tessman@hotmail.com>
  43  *   Brodie Thiesfield <brofield@jellycan.com>
  44  *   Jungshik Shin <jshin@i18nl10n.com>
  45  *
  46  * Alternatively, the contents of this file may be used under the terms of
  47  * either of the GNU General Public License Version 2 or later (the "GPL"),
  48  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  49  * in which case the provisions of the GPL or the LGPL are applicable instead
  50  * of those above. If you wish to allow use of your version of this file only
  51  * under the terms of either the GPL or the LGPL, and not to allow others to
  52  * use your version of this file under the terms of the MPL, indicate your
  53  * decision by deleting the provisions above and replace them with the notice
  54  * and other provisions required by the GPL or the LGPL. If you do not delete
  55  * the provisions above, a recipient may use your version of this file under
  56  * the terms of any one of the MPL, the GPL or the LGPL.
  57  *
  58  * ***** END LICENSE BLOCK ***** */
  59
  60 // When adding new entries to this list, also append the file extension to the
  61 // kDangerousFileTypes array in download_stats.cc.
  62 static const struct Executables {
  63     const char* extension;
  64     DownloadDangerLevel level;
  65 } g_executables[] = {
  66   // Some files are dangerous on all platforms.
  67   //
  68   // Flash files downloaded locally can sometimes access the local filesystem.
  69   { "swf", DANGEROUS },
  70   { "spl", DANGEROUS },
  71   // Chrome extensions should be obtained through the web store.
  72   { "crx", ALLOW_ON_USER_GESTURE },
  73
  74   // Windows, all file categories.
  75 #if defined(OS_WIN)
  76   { "ad", ALLOW_ON_USER_GESTURE },
  77   { "ade", ALLOW_ON_USER_GESTURE },
  78   { "adp", ALLOW_ON_USER_GESTURE },
  79   { "app", ALLOW_ON_USER_GESTURE },
  80   { "application", ALLOW_ON_USER_GESTURE },
  81   { "asp", ALLOW_ON_USER_GESTURE },
  82   { "asx", ALLOW_ON_USER_GESTURE },
  83   { "bas", ALLOW_ON_USER_GESTURE },
  84   { "bat", ALLOW_ON_USER_GESTURE },
  85   { "cfg", DANGEROUS },
  86   { "chi", ALLOW_ON_USER_GESTURE },
  87   { "chm", ALLOW_ON_USER_GESTURE },
  88   { "cmd", ALLOW_ON_USER_GESTURE },
  89   { "com", ALLOW_ON_USER_GESTURE },
  90   { "cpl", ALLOW_ON_USER_GESTURE },
  91   { "crt", ALLOW_ON_USER_GESTURE },
  92   { "dll", DANGEROUS },
  93   { "drv", DANGEROUS },
  94   { "exe", ALLOW_ON_USER_GESTURE },
  95   { "fxp", ALLOW_ON_USER_GESTURE },
  96   { "grp", DANGEROUS },
  97   { "hlp", ALLOW_ON_USER_GESTURE },
  98   { "hta", ALLOW_ON_USER_GESTURE },
  99   { "htt", ALLOW_ON_USER_GESTURE },
 100   { "inf", ALLOW_ON_USER_GESTURE },
 101   { "ini", DANGEROUS },
 102   { "ins", ALLOW_ON_USER_GESTURE },
 103   { "isp", ALLOW_ON_USER_GESTURE },
 104   { "js", ALLOW_ON_USER_GESTURE },
 105   { "jse", ALLOW_ON_USER_GESTURE },
 106   { "lnk", ALLOW_ON_USER_GESTURE },
 107   { "local", DANGEROUS },
 108   { "mad", ALLOW_ON_USER_GESTURE },
 109   { "maf", ALLOW_ON_USER_GESTURE },
 110   { "mag", ALLOW_ON_USER_GESTURE },
 111   { "mam", ALLOW_ON_USER_GESTURE },
 112   { "manifest", DANGEROUS },
 113   { "maq", ALLOW_ON_USER_GESTURE },
 114   { "mar", ALLOW_ON_USER_GESTURE },
 115   { "mas", ALLOW_ON_USER_GESTURE },
 116   { "mat", ALLOW_ON_USER_GESTURE },
 117   { "mau", ALLOW_ON_USER_GESTURE },
 118   { "mav", ALLOW_ON_USER_GESTURE },
 119   { "maw", ALLOW_ON_USER_GESTURE },
 120   { "mda", ALLOW_ON_USER_GESTURE },
 121   { "mdb", ALLOW_ON_USER_GESTURE },
 122   { "mde", ALLOW_ON_USER_GESTURE },
 123   { "mdt", ALLOW_ON_USER_GESTURE },
 124   { "mdw", ALLOW_ON_USER_GESTURE },
 125   { "mdz", ALLOW_ON_USER_GESTURE },
 126   { "mht", ALLOW_ON_USER_GESTURE },
 127   { "mhtml", ALLOW_ON_USER_GESTURE },
 128   { "mmc", ALLOW_ON_USER_GESTURE },
 129   { "mof", DANGEROUS },
 130   { "msc", ALLOW_ON_USER_GESTURE },
 131   { "msh", ALLOW_ON_USER_GESTURE },
 132   { "mshxml", ALLOW_ON_USER_GESTURE },
 133   { "msi", ALLOW_ON_USER_GESTURE },
 134   { "msp", ALLOW_ON_USER_GESTURE },
 135   { "mst", ALLOW_ON_USER_GESTURE },
 136   { "ocx", DANGEROUS },
 137   { "ops", ALLOW_ON_USER_GESTURE },
 138   { "pcd", ALLOW_ON_USER_GESTURE },
 139   { "pif", ALLOW_ON_USER_GESTURE },
 140   { "plg", ALLOW_ON_USER_GESTURE },
 141   { "prf", ALLOW_ON_USER_GESTURE },
 142   { "prg", ALLOW_ON_USER_GESTURE },
 143   { "pst", ALLOW_ON_USER_GESTURE },
 144   { "reg", ALLOW_ON_USER_GESTURE },
 145   { "scf", ALLOW_ON_USER_GESTURE },
 146   { "scr", ALLOW_ON_USER_GESTURE },
 147   { "sct", ALLOW_ON_USER_GESTURE },
 148   { "shb", ALLOW_ON_USER_GESTURE },
 149   { "shs", ALLOW_ON_USER_GESTURE },
 150   { "sys", DANGEROUS },
 151   { "url", DANGEROUS },
 152   { "vb", ALLOW_ON_USER_GESTURE },
 153   { "vbe", ALLOW_ON_USER_GESTURE },
 154   { "vbs", ALLOW_ON_USER_GESTURE },
 155   { "vsd", ALLOW_ON_USER_GESTURE },
 156   { "vsmacros", ALLOW_ON_USER_GESTURE },
 157   { "vss", ALLOW_ON_USER_GESTURE },
 158   { "vst", ALLOW_ON_USER_GESTURE },
 159   { "vsw", ALLOW_ON_USER_GESTURE },
 160   { "website", DANGEROUS },
 161   { "ws", ALLOW_ON_USER_GESTURE },
 162   { "wsc", ALLOW_ON_USER_GESTURE },
 163   { "wsf", ALLOW_ON_USER_GESTURE },
 164   { "wsh", ALLOW_ON_USER_GESTURE },
 165   { "xbap", DANGEROUS },
 166 #endif  // OS_WIN
 167
 168   // Java.
 169 #if !defined(OS_CHROMEOS)
 170   { "class", DANGEROUS },
 171   { "jar", DANGEROUS },
 172   { "jnlp", DANGEROUS },
 173 #endif
 174
 175   // Scripting languages. (Shells are handled below.)
 176 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
 177   { "pl", ALLOW_ON_USER_GESTURE },
 178   { "py", ALLOW_ON_USER_GESTURE },
 179   { "pyc", ALLOW_ON_USER_GESTURE },
 180   { "pyw", ALLOW_ON_USER_GESTURE },
 181   { "rb", ALLOW_ON_USER_GESTURE },
 182 #endif
 183
 184   // Shell languages. (OS_ANDROID is OS_POSIX.) OS_WIN shells are handled above.
 185 #if defined(OS_POSIX)
 186   { "bash", ALLOW_ON_USER_GESTURE },
 187   { "csh", ALLOW_ON_USER_GESTURE },
 188   { "ksh", ALLOW_ON_USER_GESTURE },
 189   { "sh", ALLOW_ON_USER_GESTURE },
 190   { "shar", ALLOW_ON_USER_GESTURE },
 191   { "tcsh", ALLOW_ON_USER_GESTURE },
 192 #endif
 193 #if defined(OS_MACOSX)
 194   { "command", ALLOW_ON_USER_GESTURE },
 195 #endif
 196
 197   // Package management formats. OS_WIN package formats are handled above.
 198 #if defined(OS_MACOSX) || defined(OS_LINUX)
 199   { "pkg", ALLOW_ON_USER_GESTURE },
 200 #endif
 201 #if defined(OS_LINUX)
 202   { "deb", ALLOW_ON_USER_GESTURE },
 203   { "rpm", ALLOW_ON_USER_GESTURE },
 204 #endif
 205 #if defined(OS_ANDROID)
 206   { "dex", ALLOW_ON_USER_GESTURE },  // Really an executable format.
 207 #endif
 208 };
 209
 210 DownloadDangerLevel GetFileDangerLevel(const base::FilePath& path) {
 211   base::FilePath::StringType extension(path.FinalExtension());
 212   if (extension.empty())
 213     return NOT_DANGEROUS;
 214   if (!base::IsStringASCII(extension))
 215     return NOT_DANGEROUS;
 216 #if defined(OS_WIN)
 217   std::string ascii_extension = base::UTF16ToASCII(extension);
 218 #elif defined(OS_POSIX)
 219   std::string ascii_extension = extension;
 220 #endif
 221
 222   // Strip out leading dot if it's still there
 223   if (ascii_extension[0] == base::FilePath::kExtensionSeparator)
 224     ascii_extension.erase(0, 1);
 225
 226   for (size_t i = 0; i < arraysize(g_executables); ++i) {
 227     if (base::LowerCaseEqualsASCII(ascii_extension, g_executables[i].extension))
 228       return g_executables[i].level;
 229   }
 230   return NOT_DANGEROUS;
 231 }
 232
 233 static const char* kExecutableWhiteList[] = {
 234   // JavaScript is just as powerful as EXE.
 235   "text/javascript",
 236   "text/javascript;version=*",
 237   "text/html",
 238   // Registry files can cause critical changes to the MS OS behavior.
 239   // Addition of this mimetype also addresses bug 7337.
 240   "text/x-registry",
 241   "text/x-sh",
 242   // Some sites use binary/octet-stream to mean application/octet-stream.
 243   // See http://code.google.com/p/chromium/issues/detail?id=1573
 244   "binary/octet-stream"
 245 };
 246
 247 static const char* kExecutableBlackList[] = {
 248   // These application types are not executable.
 249   "application/*+xml",
 250   "application/xml"
 251 };
 252
 253 bool IsExecutableMimeType(const std::string& mime_type) {
 254   for (size_t i = 0; i < arraysize(kExecutableWhiteList); ++i) {
 255     if (net::MatchesMimeType(kExecutableWhiteList[i], mime_type))
 256       return true;
 257   }
 258   for (size_t i = 0; i < arraysize(kExecutableBlackList); ++i) {
 259     if (net::MatchesMimeType(kExecutableBlackList[i], mime_type))
 260       return false;
 261   }
 262   // We consider only other application types to be executable.
 263   return net::MatchesMimeType("application/*", mime_type);
 264 }
 265
 266
 267 }  // namespace download_util