npapi_plugin/origin.cc

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 #include <stdio.h>
  34
  35 #include <cctype>
  36 #include <string>
  37 #include <algorithm>
  38
  39 #include "native_client/include/base/basictypes.h"
  40 #include "native_client/npapi_plugin/origin.h"
  41
  42 #ifdef  ORIGIN_DEBUG
  43 # define dprintf(alist) printf alist
  44 #else
  45 # define dprintf(alist)
  46 #endif
  47
  48 namespace nacl {
  49
  50 std::string UrlToOrigin(std::string url) {
  51   std::string::iterator it = find(url.begin(), url.end(), ':');
  52   if (url.end() == it) {
  53     dprintf(("no protospec separator found\n"));
  54     return "";
  55   }
  56   for (int num_slashes = 0; num_slashes < 3; ++num_slashes) {
  57     it = find(it + 1, url.end(), '/');
  58     if (url.end() == it) {
  59       dprintf(("no start of pathspec found\n"));
  60       return "";
  61     }
  62   }
  63
  64   std::string origin(url.begin(), it);
  65
  66   //
  67   // Domain names are in ascii and case insensitive, so we can
  68   // canonicalize to all lower case.  NB: Internationalizing Domain
  69   // Names in Applications (IDNA) encodes unicode in this reduced
  70   // alphabet.
  71   //
  72   for (it = origin.begin(); origin.end() != it; ++it) {
  73     *it = tolower(*it);
  74   }
  75   //
  76   // cannonicalize empty hostname as "localhost"
  77   //
  78   if ("file://" == origin) {
  79     origin = "file://localhost";
  80   }
  81   return origin;
  82 }
  83
  84 // For now we are just checking that NaCl modules are local, or on
  85 // code.google.com.  Beware NaCl modules in the browser cache!
  86 //
  87 // Eventually, after sufficient security testing, we will always
  88 // return true.
  89 bool OriginIsInWhitelist(std::string origin) {
  90   static char const *allowed_origin[] = {
  91     /*
  92      * do *NOT* add in file://localhost as a way to get old tests to
  93      * work.  The file://localhost was only for early stage testing
  94      * -- having it can be a security problem if an adversary can
  95      * guess browser cache file names.
  96      */
  97     "http://localhost",
  98     "http://localhost:80",
  99     "http://localhost:5103",
 100 #if 0
 101     "http://code.google.com",  // for demos hosted on project website
 102 #endif
 103   };
 104   for (size_t i = 0; i < ARRAYSIZE(allowed_origin); ++i) {
 105     if (origin == allowed_origin[i]) {
 106       return true;
 107     }
 108   }
 109   return false;
 110 }
 111
 112 }