ppapi/proxy/interface_list.h

   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 #ifndef PPAPI_PROXY_INTERFACE_LIST_H_
   6 #define PPAPI_PROXY_INTERFACE_LIST_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "ppapi/proxy/interface_proxy.h"
  13 #include "ppapi/proxy/ppapi_proxy_export.h"
  14 #include "ppapi/shared_impl/ppapi_permissions.h"
  15
  16 namespace ppapi {
  17 namespace proxy {
  18
  19 class PPAPI_PROXY_EXPORT InterfaceList {
  20  public:
  21   InterfaceList();
  22   ~InterfaceList();
  23
  24   static InterfaceList* GetInstance();
  25
  26   // Sets the permissions that the interface list will use to compute
  27   // whether an interface is available to the current process. By default,
  28   // this will be "no permissions", which will give only access to public
  29   // stable interfaces via GetInterface.
  30   //
  31   // IMPORTANT: This is not a security boundary. Malicious plugins can bypass
  32   // this check since they run in the same address space as this code in the
  33   // plugin process. A real security check is required for all IPC messages.
  34   // This check just allows us to return NULL for interfaces you "shouldn't" be
  35   // using to keep honest plugins honest.
  36   static void SetProcessGlobalPermissions(const PpapiPermissions& permissions);
  37
  38   // Looks up the factory function for the given ID. Returns NULL if not
  39   // supported.
  40   InterfaceProxy::Factory GetFactoryForID(ApiID id) const;
  41
  42   // Returns the interface pointer for the given browser or plugin interface,
  43   // or NULL if it's not supported.
  44   const void* GetInterfaceForPPB(const std::string& name);
  45   const void* GetInterfaceForPPP(const std::string& name) const;
  46
  47  private:
  48   friend class InterfaceListTest;
  49
  50   struct InterfaceInfo {
  51     InterfaceInfo()
  52         : iface(NULL),
  53           required_permission(PERMISSION_NONE),
  54           interface_logged(false) {
  55     }
  56     InterfaceInfo(const void* in_interface, Permission in_perm)
  57         : iface(in_interface),
  58           required_permission(in_perm),
  59           interface_logged(false) {
  60     }
  61
  62     const void* iface;
  63
  64     // Permission required to return non-null for this interface. This will
  65     // be checked with the value set via SetProcessGlobalPermissionBits when
  66     // an interface is requested.
  67     Permission required_permission;
  68
  69     // Interface usage is logged just once per-interface-per-plugin-process.
  70     bool interface_logged;
  71   };
  72
  73   typedef std::map<std::string, InterfaceInfo> NameToInterfaceInfoMap;
  74
  75   void AddProxy(ApiID id, InterfaceProxy::Factory factory);
  76
  77   // Permissions is the type of permission required to access the corresponding
  78   // interface. Currently this must be just one unique permission (rather than
  79   // a bitfield).
  80   void AddPPB(const char* name, const void* iface, Permission permission);
  81   void AddPPP(const char* name, const void* iface);
  82
  83   // Hash the interface name for UMA logging.
  84   static int HashInterfaceName(const std::string& name);
  85
  86   PpapiPermissions permissions_;
  87
  88   NameToInterfaceInfoMap name_to_browser_info_;
  89   NameToInterfaceInfoMap name_to_plugin_info_;
  90
  91   InterfaceProxy::Factory id_to_factory_[API_ID_COUNT];
  92
  93   DISALLOW_COPY_AND_ASSIGN(InterfaceList);
  94 };
  95
  96 }  // namespace proxy
  97 }  // namespace ppapi
  98
  99 #endif  // PPAPI_PROXY_INTERFACE_LIST_H_
 100