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      1 // Copyright 2013 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/common/pepper_permission_util.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/command_line.h"
     10 #include "base/sha1.h"
     11 #include "base/strings/string_number_conversions.h"
     12 #include "base/strings/string_tokenizer.h"
     13 #include "chrome/common/extensions/extension_set.h"
     14 #include "extensions/common/constants.h"
     15 #include "extensions/common/extension.h"
     16 #include "extensions/common/manifest_handlers/shared_module_info.h"
     17 
     18 using extensions::Extension;
     19 using extensions::Manifest;
     20 
     21 namespace chrome {
     22 
     23 namespace {
     24 
     25 std::string HashHost(const std::string& host) {
     26   const std::string id_hash = base::SHA1HashString(host);
     27   DCHECK_EQ(id_hash.length(), base::kSHA1Length);
     28   return base::HexEncode(id_hash.c_str(), id_hash.length());
     29 }
     30 
     31 bool HostIsInSet(const std::string& host, const std::set<std::string>& set) {
     32   return set.count(host) > 0 || set.count(HashHost(host)) > 0;
     33 }
     34 
     35 }  // namespace
     36 
     37 bool IsExtensionOrSharedModuleWhitelisted(
     38     const GURL& url,
     39     const ExtensionSet* extension_set,
     40     const std::set<std::string>& whitelist) {
     41   if (!url.is_valid() || !url.SchemeIs(extensions::kExtensionScheme))
     42     return false;
     43 
     44   const std::string host = url.host();
     45   if (HostIsInSet(host, whitelist))
     46     return true;
     47 
     48   // Check the modules that are imported by this extension to see if any of them
     49   // is whitelisted.
     50   const Extension* extension = extension_set ? extension_set->GetByID(host)
     51                                              : NULL;
     52   if (extension) {
     53     typedef std::vector<extensions::SharedModuleInfo::ImportInfo>
     54         ImportInfoVector;
     55     const ImportInfoVector& imports =
     56         extensions::SharedModuleInfo::GetImports(extension);
     57     for (ImportInfoVector::const_iterator it = imports.begin();
     58          it != imports.end(); ++it) {
     59       const Extension* imported_extension = extension_set->GetByID(
     60           it->extension_id);
     61       if (imported_extension &&
     62           extensions::SharedModuleInfo::IsSharedModule(imported_extension) &&
     63           HostIsInSet(it->extension_id, whitelist)) {
     64         return true;
     65       }
     66     }
     67   }
     68 
     69   return false;
     70 }
     71 
     72 bool IsHostAllowedByCommandLine(const GURL& url,
     73                                 const ExtensionSet* extension_set,
     74                                 const char* command_line_switch) {
     75   if (!url.is_valid())
     76     return false;
     77 
     78   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     79   const std::string allowed_list =
     80       command_line.GetSwitchValueASCII(command_line_switch);
     81   if (allowed_list.empty())
     82     return false;
     83 
     84   const std::string host = url.host();
     85   if (allowed_list == "*") {
     86     // For now, we only allow packaged and platform apps in this wildcard.
     87     if (!extension_set || !url.SchemeIs(extensions::kExtensionScheme))
     88       return false;
     89 
     90     const Extension* extension = extension_set->GetByID(host);
     91     return extension &&
     92         (extension->GetType() == Manifest::TYPE_LEGACY_PACKAGED_APP ||
     93          extension->GetType() == Manifest::TYPE_PLATFORM_APP);
     94   }
     95 
     96   base::StringTokenizer t(allowed_list, ",");
     97   while (t.GetNext()) {
     98     if (t.token() == host)
     99       return true;
    100   }
    101 
    102   return false;
    103 }
    104 
    105 }  // namespace chrome
    106