sandbox/win/src/sandbox_policy_base.h

   1 // Copyright (c) 2011 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 SANDBOX_WIN_SRC_SANDBOX_POLICY_BASE_H_
   6 #define SANDBOX_WIN_SRC_SANDBOX_POLICY_BASE_H_
   7
   8 #include <windows.h>
   9
  10 #include <list>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/compiler_specific.h"
  15 #include "base/string16.h"
  16 #include "sandbox/win/src/crosscall_server.h"
  17 #include "sandbox/win/src/handle_closer.h"
  18 #include "sandbox/win/src/ipc_tags.h"
  19 #include "sandbox/win/src/policy_engine_opcodes.h"
  20 #include "sandbox/win/src/policy_engine_params.h"
  21 #include "sandbox/win/src/sandbox_policy.h"
  22 #include "sandbox/win/src/win_utils.h"
  23
  24 namespace sandbox {
  25
  26 class AppContainerAttributes;
  27 class LowLevelPolicy;
  28 class TargetProcess;
  29 struct PolicyGlobal;
  30
  31 // We act as a policy dispatcher, implementing the handler for the "ping" IPC,
  32 // so we have to provide the appropriate handler on the OnMessageReady method.
  33 // There is a static_cast for the handler, and the compiler only performs the
  34 // cast if the first base class is Dispatcher.
  35 class PolicyBase : public Dispatcher, public TargetPolicy {
  36  public:
  37   PolicyBase();
  38
  39   // TargetPolicy:
  40   virtual void AddRef() OVERRIDE;
  41   virtual void Release() OVERRIDE;
  42   virtual ResultCode SetTokenLevel(TokenLevel initial,
  43                                    TokenLevel lockdown) OVERRIDE;
  44   virtual ResultCode SetJobLevel(JobLevel job_level,
  45                                  uint32 ui_exceptions) OVERRIDE;
  46   virtual ResultCode SetAlternateDesktop(bool alternate_winstation) OVERRIDE;
  47   virtual string16 GetAlternateDesktop() const OVERRIDE;
  48   virtual ResultCode CreateAlternateDesktop(bool alternate_winstation) OVERRIDE;
  49   virtual void DestroyAlternateDesktop() OVERRIDE;
  50   virtual ResultCode SetIntegrityLevel(IntegrityLevel integrity_level) OVERRIDE;
  51   virtual ResultCode SetDelayedIntegrityLevel(
  52       IntegrityLevel integrity_level) OVERRIDE;
  53   virtual ResultCode SetAppContainer(const wchar_t* sid) OVERRIDE;
  54   virtual ResultCode SetCapability(const wchar_t* sid) OVERRIDE;
  55   virtual ResultCode SetProcessMitigations(MitigationFlags flags) OVERRIDE;
  56   virtual MitigationFlags GetProcessMitigations() OVERRIDE;
  57   virtual ResultCode SetDelayedProcessMitigations(
  58       MitigationFlags flags) OVERRIDE;
  59   virtual MitigationFlags GetDelayedProcessMitigations() OVERRIDE;
  60   virtual void SetStrictInterceptions() OVERRIDE;
  61   virtual ResultCode AddRule(SubSystem subsystem, Semantics semantics,
  62                              const wchar_t* pattern) OVERRIDE;
  63   virtual ResultCode AddDllToUnload(const wchar_t* dll_name);
  64   virtual ResultCode AddKernelObjectToClose(const char16* handle_type,
  65                                             const char16* handle_name) OVERRIDE;
  66
  67   // Dispatcher:
  68   virtual Dispatcher* OnMessageReady(IPCParams* ipc,
  69                                      CallbackGeneric* callback) OVERRIDE;
  70   virtual bool SetupService(InterceptionManager* manager, int service) OVERRIDE;
  71
  72   // Creates a Job object with the level specified in a previous call to
  73   // SetJobLevel().
  74   ResultCode MakeJobObject(HANDLE* job);
  75
  76   // Creates the two tokens with the levels specified in a previous call to
  77   // SetTokenLevel().
  78   ResultCode MakeTokens(HANDLE* initial, HANDLE* lockdown);
  79
  80   const AppContainerAttributes* GetAppContainer();
  81
  82   // Adds a target process to the internal list of targets. Internally a
  83   // call to TargetProcess::Init() is issued.
  84   bool AddTarget(TargetProcess* target);
  85
  86   // Called when there are no more active processes in a Job.
  87   // Removes a Job object associated with this policy and the target associated
  88   // with the job.
  89   bool OnJobEmpty(HANDLE job);
  90
  91   EvalResult EvalPolicy(int service, CountedParameterSetBase* params);
  92
  93  private:
  94   ~PolicyBase();
  95
  96   // Test IPC providers.
  97   bool Ping(IPCInfo* ipc, void* cookie);
  98
  99   // Returns a dispatcher from ipc_targets_.
 100   Dispatcher* GetDispatcher(int ipc_tag);
 101
 102   // Sets up interceptions for a new target.
 103   bool SetupAllInterceptions(TargetProcess* target);
 104
 105   // Sets up the handle closer for a new target.
 106   bool SetupHandleCloser(TargetProcess* target);
 107
 108   // This lock synchronizes operations on the targets_ collection.
 109   CRITICAL_SECTION lock_;
 110   // Maintains the list of target process associated with this policy.
 111   // The policy takes ownership of them.
 112   typedef std::list<TargetProcess*> TargetSet;
 113   TargetSet targets_;
 114   // Standard object-lifetime reference counter.
 115   volatile LONG ref_count;
 116   // The user-defined global policy settings.
 117   TokenLevel lockdown_level_;
 118   TokenLevel initial_level_;
 119   JobLevel job_level_;
 120   uint32 ui_exceptions_;
 121   bool use_alternate_desktop_;
 122   bool use_alternate_winstation_;
 123   // Helps the file system policy initialization.
 124   bool file_system_init_;
 125   bool relaxed_interceptions_;
 126   IntegrityLevel integrity_level_;
 127   IntegrityLevel delayed_integrity_level_;
 128   MitigationFlags mitigations_;
 129   MitigationFlags delayed_mitigations_;
 130   // The array of objects that will answer IPC calls.
 131   Dispatcher* ipc_targets_[IPC_LAST_TAG];
 132   // Object in charge of generating the low level policy.
 133   LowLevelPolicy* policy_maker_;
 134   // Memory structure that stores the low level policy.
 135   PolicyGlobal* policy_;
 136   // The list of dlls to unload in the target process.
 137   std::vector<string16> blacklisted_dlls_;
 138   // This is a map of handle-types to names that we need to close in the
 139   // target process. A null set means we need to close all handles of the
 140   // given type.
 141   HandleCloser handle_closer_;
 142   std::vector<string16> capabilities_;
 143   scoped_ptr<AppContainerAttributes> appcontainer_list_;
 144
 145   static HDESK alternate_desktop_handle_;
 146   static HWINSTA alternate_winstation_handle_;
 147
 148   DISALLOW_COPY_AND_ASSIGN(PolicyBase);
 149 };
 150
 151 }  // namespace sandbox
 152
 153 #endif  // SANDBOX_WIN_SRC_SANDBOX_POLICY_BASE_H_