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 "extensions/common/constants.h"
14 #include "extensions/common/extension.h"
15 #include "extensions/common/extension_set.h"
16 #include "extensions/common/manifest_handlers/shared_module_info.h"
17
18 using extensions::Extension;
19 using extensions::Manifest;
20 using extensions::SharedModuleInfo;
21
22 namespace chrome {
23
24 namespace {
25
HashHost(const std::string & host)26 std::string HashHost(const std::string& host) {
27 const std::string id_hash = base::SHA1HashString(host);
28 DCHECK_EQ(id_hash.length(), base::kSHA1Length);
29 return base::HexEncode(id_hash.c_str(), id_hash.length());
30 }
31
HostIsInSet(const std::string & host,const std::set<std::string> & set)32 bool HostIsInSet(const std::string& host, const std::set<std::string>& set) {
33 return set.count(host) > 0 || set.count(HashHost(host)) > 0;
34 }
35
36 } // namespace
37
IsExtensionOrSharedModuleWhitelisted(const GURL & url,const extensions::ExtensionSet * extension_set,const std::set<std::string> & whitelist)38 bool IsExtensionOrSharedModuleWhitelisted(
39 const GURL& url,
40 const extensions::ExtensionSet* extension_set,
41 const std::set<std::string>& whitelist) {
42 if (!url.is_valid() || !url.SchemeIs(extensions::kExtensionScheme))
43 return false;
44
45 const std::string host = url.host();
46 if (HostIsInSet(host, whitelist))
47 return true;
48
49 // Check the modules that are imported by this extension to see if any of them
50 // is whitelisted.
51 const Extension* extension = extension_set ? extension_set->GetByID(host)
52 : NULL;
53 if (!extension)
54 return false;
55
56 typedef std::vector<SharedModuleInfo::ImportInfo> ImportInfoVector;
57 const ImportInfoVector& imports = SharedModuleInfo::GetImports(extension);
58 for (ImportInfoVector::const_iterator it = imports.begin();
59 it != imports.end();
60 ++it) {
61 const Extension* imported_extension =
62 extension_set->GetByID(it->extension_id);
63 if (imported_extension &&
64 SharedModuleInfo::IsSharedModule(imported_extension) &&
65 HostIsInSet(it->extension_id, whitelist)) {
66 return true;
67 }
68 }
69
70 return false;
71 }
72
IsHostAllowedByCommandLine(const GURL & url,const extensions::ExtensionSet * extension_set,const char * command_line_switch)73 bool IsHostAllowedByCommandLine(const GURL& url,
74 const extensions::ExtensionSet* extension_set,
75 const char* command_line_switch) {
76 if (!url.is_valid())
77 return false;
78
79 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
80 const std::string allowed_list =
81 command_line.GetSwitchValueASCII(command_line_switch);
82 if (allowed_list.empty())
83 return false;
84
85 const std::string host = url.host();
86 if (allowed_list == "*") {
87 // For now, we only allow packaged and platform apps in this wildcard.
88 if (!extension_set || !url.SchemeIs(extensions::kExtensionScheme))
89 return false;
90
91 const Extension* extension = extension_set->GetByID(host);
92 return extension &&
93 (extension->GetType() == Manifest::TYPE_LEGACY_PACKAGED_APP ||
94 extension->GetType() == Manifest::TYPE_PLATFORM_APP);
95 }
96
97 base::StringTokenizer t(allowed_list, ",");
98 while (t.GetNext()) {
99 if (t.token() == host)
100 return true;
101 }
102
103 return false;
104 }
105
106 } // namespace chrome
107