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/strings/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 TokenLevel GetInitialTokenLevel() const override;
  45   virtual TokenLevel GetLockdownTokenLevel() const override;
  46   virtual ResultCode SetJobLevel(JobLevel job_level,
  47                                  uint32 ui_exceptions) override;
  48   virtual ResultCode SetJobMemoryLimit(size_t memory_limit) override;
  49   virtual ResultCode SetAlternateDesktop(bool alternate_winstation) override;
  50   virtual base::string16 GetAlternateDesktop() const override;
  51   virtual ResultCode CreateAlternateDesktop(bool alternate_winstation) override;
  52   virtual void DestroyAlternateDesktop() override;
  53   virtual ResultCode SetIntegrityLevel(IntegrityLevel integrity_level) override;
  54   virtual IntegrityLevel GetIntegrityLevel() const override;
  55   virtual ResultCode SetDelayedIntegrityLevel(
  56       IntegrityLevel integrity_level) override;
  57   virtual ResultCode SetAppContainer(const wchar_t* sid) override;
  58   virtual ResultCode SetCapability(const wchar_t* sid) override;
  59   virtual ResultCode SetLowBox(const wchar_t* sid) override;
  60   virtual ResultCode SetProcessMitigations(MitigationFlags flags) override;
  61   virtual MitigationFlags GetProcessMitigations() override;
  62   virtual ResultCode SetDelayedProcessMitigations(
  63       MitigationFlags flags) override;
  64   virtual MitigationFlags GetDelayedProcessMitigations() const override;
  65   virtual void SetStrictInterceptions() override;
  66   virtual ResultCode SetStdoutHandle(HANDLE handle) override;
  67   virtual ResultCode SetStderrHandle(HANDLE handle) override;
  68   virtual ResultCode AddRule(SubSystem subsystem, Semantics semantics,
  69                              const wchar_t* pattern) override;
  70   virtual ResultCode AddDllToUnload(const wchar_t* dll_name) override;
  71   virtual ResultCode AddKernelObjectToClose(
  72       const base::char16* handle_type,
  73       const base::char16* handle_name) override;
  74
  75   // Dispatcher:
  76   virtual Dispatcher* OnMessageReady(IPCParams* ipc,
  77                                      CallbackGeneric* callback) override;
  78   virtual bool SetupService(InterceptionManager* manager, int service) override;
  79
  80   // Creates a Job object with the level specified in a previous call to
  81   // SetJobLevel().
  82   ResultCode MakeJobObject(HANDLE* job);
  83
  84   // Creates the two tokens with the levels specified in a previous call to
  85   // SetTokenLevel().
  86   ResultCode MakeTokens(HANDLE* initial, HANDLE* lockdown);
  87
  88   const AppContainerAttributes* GetAppContainer() const;
  89
  90   const PSID GetLowBoxSid() const;
  91
  92   // Adds a target process to the internal list of targets. Internally a
  93   // call to TargetProcess::Init() is issued.
  94   bool AddTarget(TargetProcess* target);
  95
  96   // Called when there are no more active processes in a Job.
  97   // Removes a Job object associated with this policy and the target associated
  98   // with the job.
  99   bool OnJobEmpty(HANDLE job);
 100
 101   EvalResult EvalPolicy(int service, CountedParameterSetBase* params);
 102
 103   HANDLE GetStdoutHandle();
 104   HANDLE GetStderrHandle();
 105
 106  private:
 107   ~PolicyBase();
 108
 109   // Test IPC providers.
 110   bool Ping(IPCInfo* ipc, void* cookie);
 111
 112   // Returns a dispatcher from ipc_targets_.
 113   Dispatcher* GetDispatcher(int ipc_tag);
 114
 115   // Sets up interceptions for a new target.
 116   bool SetupAllInterceptions(TargetProcess* target);
 117
 118   // Sets up the handle closer for a new target.
 119   bool SetupHandleCloser(TargetProcess* target);
 120
 121   ResultCode AddRuleInternal(SubSystem subsystem,
 122                              Semantics semantics,
 123                              const wchar_t* pattern);
 124
 125   // This lock synchronizes operations on the targets_ collection.
 126   CRITICAL_SECTION lock_;
 127   // Maintains the list of target process associated with this policy.
 128   // The policy takes ownership of them.
 129   typedef std::list<TargetProcess*> TargetSet;
 130   TargetSet targets_;
 131   // Standard object-lifetime reference counter.
 132   volatile LONG ref_count;
 133   // The user-defined global policy settings.
 134   TokenLevel lockdown_level_;
 135   TokenLevel initial_level_;
 136   JobLevel job_level_;
 137   uint32 ui_exceptions_;
 138   size_t memory_limit_;
 139   bool use_alternate_desktop_;
 140   bool use_alternate_winstation_;
 141   // Helps the file system policy initialization.
 142   bool file_system_init_;
 143   bool relaxed_interceptions_;
 144   HANDLE stdout_handle_;
 145   HANDLE stderr_handle_;
 146   IntegrityLevel integrity_level_;
 147   IntegrityLevel delayed_integrity_level_;
 148   MitigationFlags mitigations_;
 149   MitigationFlags delayed_mitigations_;
 150   // The array of objects that will answer IPC calls.
 151   Dispatcher* ipc_targets_[IPC_LAST_TAG];
 152   // Object in charge of generating the low level policy.
 153   LowLevelPolicy* policy_maker_;
 154   // Memory structure that stores the low level policy.
 155   PolicyGlobal* policy_;
 156   // The list of dlls to unload in the target process.
 157   std::vector<base::string16> blacklisted_dlls_;
 158   // This is a map of handle-types to names that we need to close in the
 159   // target process. A null set means we need to close all handles of the
 160   // given type.
 161   HandleCloser handle_closer_;
 162   std::vector<base::string16> capabilities_;
 163   scoped_ptr<AppContainerAttributes> appcontainer_list_;
 164   PSID lowbox_sid_;
 165
 166   static HDESK alternate_desktop_handle_;
 167   static HWINSTA alternate_winstation_handle_;
 168   static IntegrityLevel alternate_desktop_integrity_level_label_;
 169
 170   DISALLOW_COPY_AND_ASSIGN(PolicyBase);
 171 };
 172
 173 }  // namespace sandbox
 174
 175 #endif  // SANDBOX_WIN_SRC_SANDBOX_POLICY_BASE_H_