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 static const struct Executables {
  61     const char* extension;
  62     DownloadDangerLevel level;
  63 } g_executables[] = {
  64   // Some files are dangerous on all platforms.
  65   //
  66   // Flash files downloaded locally can sometimes access the local filesystem.
  67   { "swf", DANGEROUS },
  68   { "spl", DANGEROUS },
  69   // Chrome extensions should be obtained through the web store.
  70   { "crx", ALLOW_ON_USER_GESTURE },
  71
  72   // Windows, all file categories.
  73 #if defined(OS_WIN)
  74   { "ad", ALLOW_ON_USER_GESTURE },
  75   { "ade", ALLOW_ON_USER_GESTURE },
  76   { "adp", ALLOW_ON_USER_GESTURE },
  77   { "app", ALLOW_ON_USER_GESTURE },
  78   { "application", ALLOW_ON_USER_GESTURE },
  79   { "asp", ALLOW_ON_USER_GESTURE },
  80   { "asx", ALLOW_ON_USER_GESTURE },
  81   { "bas", ALLOW_ON_USER_GESTURE },
  82   { "bat", ALLOW_ON_USER_GESTURE },
  83   { "cfg", DANGEROUS },
  84   { "chi", ALLOW_ON_USER_GESTURE },
  85   { "chm", ALLOW_ON_USER_GESTURE },
  86   { "cmd", ALLOW_ON_USER_GESTURE },
  87   { "com", ALLOW_ON_USER_GESTURE },
  88   { "cpl", ALLOW_ON_USER_GESTURE },
  89   { "crt", ALLOW_ON_USER_GESTURE },
  90   { "dll", DANGEROUS },
  91   { "drv", DANGEROUS },
  92   { "exe", ALLOW_ON_USER_GESTURE },
  93   { "fxp", ALLOW_ON_USER_GESTURE },
  94   { "grp", DANGEROUS },
  95   { "hlp", ALLOW_ON_USER_GESTURE },
  96   { "hta", ALLOW_ON_USER_GESTURE },
  97   { "htt", ALLOW_ON_USER_GESTURE },
  98   { "inf", ALLOW_ON_USER_GESTURE },
  99   { "ini", DANGEROUS },
 100   { "ins", ALLOW_ON_USER_GESTURE },
 101   { "isp", ALLOW_ON_USER_GESTURE },
 102   { "js", ALLOW_ON_USER_GESTURE },
 103   { "jse", ALLOW_ON_USER_GESTURE },
 104   { "lnk", ALLOW_ON_USER_GESTURE },
 105   { "local", DANGEROUS },
 106   { "mad", ALLOW_ON_USER_GESTURE },
 107   { "maf", ALLOW_ON_USER_GESTURE },
 108   { "mag", ALLOW_ON_USER_GESTURE },
 109   { "mam", ALLOW_ON_USER_GESTURE },
 110   { "manifest", DANGEROUS },
 111   { "maq", ALLOW_ON_USER_GESTURE },
 112   { "mar", ALLOW_ON_USER_GESTURE },
 113   { "mas", ALLOW_ON_USER_GESTURE },
 114   { "mat", ALLOW_ON_USER_GESTURE },
 115   { "mau", ALLOW_ON_USER_GESTURE },
 116   { "mav", ALLOW_ON_USER_GESTURE },
 117   { "maw", ALLOW_ON_USER_GESTURE },
 118   { "mda", ALLOW_ON_USER_GESTURE },
 119   { "mdb", ALLOW_ON_USER_GESTURE },
 120   { "mde", ALLOW_ON_USER_GESTURE },
 121   { "mdt", ALLOW_ON_USER_GESTURE },
 122   { "mdw", ALLOW_ON_USER_GESTURE },
 123   { "mdz", ALLOW_ON_USER_GESTURE },
 124   { "mht", ALLOW_ON_USER_GESTURE },
 125   { "mhtml", ALLOW_ON_USER_GESTURE },
 126   { "mmc", ALLOW_ON_USER_GESTURE },
 127   { "mof", DANGEROUS },
 128   { "msc", ALLOW_ON_USER_GESTURE },
 129   { "msh", ALLOW_ON_USER_GESTURE },
 130   { "mshxml", ALLOW_ON_USER_GESTURE },
 131   { "msi", ALLOW_ON_USER_GESTURE },
 132   { "msp", ALLOW_ON_USER_GESTURE },
 133   { "mst", ALLOW_ON_USER_GESTURE },
 134   { "ocx", DANGEROUS },
 135   { "ops", ALLOW_ON_USER_GESTURE },
 136   { "pcd", ALLOW_ON_USER_GESTURE },
 137   { "pif", ALLOW_ON_USER_GESTURE },
 138   { "plg", ALLOW_ON_USER_GESTURE },
 139   { "prf", ALLOW_ON_USER_GESTURE },
 140   { "prg", ALLOW_ON_USER_GESTURE },
 141   { "pst", ALLOW_ON_USER_GESTURE },
 142   { "reg", ALLOW_ON_USER_GESTURE },
 143   { "scf", ALLOW_ON_USER_GESTURE },
 144   { "scr", ALLOW_ON_USER_GESTURE },
 145   { "sct", ALLOW_ON_USER_GESTURE },
 146   { "shb", ALLOW_ON_USER_GESTURE },
 147   { "shs", ALLOW_ON_USER_GESTURE },
 148   { "sys", DANGEROUS },
 149   { "url", DANGEROUS },
 150   { "vb", ALLOW_ON_USER_GESTURE },
 151   { "vbe", ALLOW_ON_USER_GESTURE },
 152   { "vbs", ALLOW_ON_USER_GESTURE },
 153   { "vsd", ALLOW_ON_USER_GESTURE },
 154   { "vsmacros", ALLOW_ON_USER_GESTURE },
 155   { "vss", ALLOW_ON_USER_GESTURE },
 156   { "vst", ALLOW_ON_USER_GESTURE },
 157   { "vsw", ALLOW_ON_USER_GESTURE },
 158   { "ws", ALLOW_ON_USER_GESTURE },
 159   { "wsc", ALLOW_ON_USER_GESTURE },
 160   { "wsf", ALLOW_ON_USER_GESTURE },
 161   { "wsh", ALLOW_ON_USER_GESTURE },
 162   { "xbap", DANGEROUS },
 163 #endif  // OS_WIN
 164
 165   // Java.
 166 #if !defined(OS_CHROMEOS)
 167   { "class", DANGEROUS },
 168   { "jar", DANGEROUS },
 169   { "jnlp", DANGEROUS },
 170 #endif
 171
 172   // Scripting languages. (Shells are handled below.)
 173 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
 174   { "pl", ALLOW_ON_USER_GESTURE },
 175   { "py", ALLOW_ON_USER_GESTURE },
 176   { "pyc", ALLOW_ON_USER_GESTURE },
 177   { "pyw", ALLOW_ON_USER_GESTURE },
 178   { "rb", ALLOW_ON_USER_GESTURE },
 179 #endif
 180
 181   // Shell languages. (OS_ANDROID is OS_POSIX.) OS_WIN shells are handled above.
 182 #if defined(OS_POSIX)
 183   { "bash", ALLOW_ON_USER_GESTURE },
 184   { "csh", ALLOW_ON_USER_GESTURE },
 185   { "ksh", ALLOW_ON_USER_GESTURE },
 186   { "sh", ALLOW_ON_USER_GESTURE },
 187   { "shar", ALLOW_ON_USER_GESTURE },
 188   { "tcsh", ALLOW_ON_USER_GESTURE },
 189 #endif
 190 #if defined(OS_MACOSX)
 191   { "command", ALLOW_ON_USER_GESTURE },
 192 #endif
 193
 194   // Package management formats. OS_WIN package formats are handled above.
 195 #if defined(OS_MACOSX) || defined(OS_LINUX)
 196   { "pkg", ALLOW_ON_USER_GESTURE },
 197 #endif
 198 #if defined(OS_LINUX)
 199   { "deb", ALLOW_ON_USER_GESTURE },
 200   { "rpm", ALLOW_ON_USER_GESTURE },
 201 #endif
 202 #if defined(OS_ANDROID)
 203   { "dex", ALLOW_ON_USER_GESTURE },  // Really an executable format.
 204 #endif
 205 };
 206
 207 DownloadDangerLevel GetFileDangerLevel(const base::FilePath& path) {
 208   base::FilePath::StringType extension(path.FinalExtension());
 209   if (extension.empty())
 210     return NOT_DANGEROUS;
 211   if (!base::IsStringASCII(extension))
 212     return NOT_DANGEROUS;
 213 #if defined(OS_WIN)
 214   std::string ascii_extension = base::UTF16ToASCII(extension);
 215 #elif defined(OS_POSIX)
 216   std::string ascii_extension = extension;
 217 #endif
 218
 219   // Strip out leading dot if it's still there
 220   if (ascii_extension[0] == base::FilePath::kExtensionSeparator)
 221     ascii_extension.erase(0, 1);
 222
 223   for (size_t i = 0; i < arraysize(g_executables); ++i) {
 224     if (LowerCaseEqualsASCII(ascii_extension, g_executables[i].extension))
 225       return g_executables[i].level;
 226   }
 227   return NOT_DANGEROUS;
 228 }
 229
 230 static const char* kExecutableWhiteList[] = {
 231   // JavaScript is just as powerful as EXE.
 232   "text/javascript",
 233   "text/javascript;version=*",
 234   "text/html",
 235   // Registry files can cause critical changes to the MS OS behavior.
 236   // Addition of this mimetype also addresses bug 7337.
 237   "text/x-registry",
 238   "text/x-sh",
 239   // Some sites use binary/octet-stream to mean application/octet-stream.
 240   // See http://code.google.com/p/chromium/issues/detail?id=1573
 241   "binary/octet-stream"
 242 };
 243
 244 static const char* kExecutableBlackList[] = {
 245   // These application types are not executable.
 246   "application/*+xml",
 247   "application/xml"
 248 };
 249
 250 bool IsExecutableMimeType(const std::string& mime_type) {
 251   for (size_t i = 0; i < arraysize(kExecutableWhiteList); ++i) {
 252     if (net::MatchesMimeType(kExecutableWhiteList[i], mime_type))
 253       return true;
 254   }
 255   for (size_t i = 0; i < arraysize(kExecutableBlackList); ++i) {
 256     if (net::MatchesMimeType(kExecutableBlackList[i], mime_type))
 257       return false;
 258   }
 259   // We consider only other application types to be executable.
 260   return net::MatchesMimeType("application/*", mime_type);
 261 }
 262
 263
 264 }  // namespace download_util