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 "base/win/scoped_handle.h"
  17 #include "sandbox/win/src/crosscall_server.h"
  18 #include "sandbox/win/src/handle_closer.h"
  19 #include "sandbox/win/src/ipc_tags.h"
  20 #include "sandbox/win/src/policy_engine_opcodes.h"
  21 #include "sandbox/win/src/policy_engine_params.h"
  22 #include "sandbox/win/src/sandbox_policy.h"
  23 #include "sandbox/win/src/win_utils.h"
  24
  25 namespace sandbox {
  26
  27 class AppContainerAttributes;
  28 class LowLevelPolicy;
  29 class TargetProcess;
  30 struct PolicyGlobal;
  31
  32 typedef std::vector<HANDLE> HandleList;
  33
  34 // We act as a policy dispatcher, implementing the handler for the "ping" IPC,
  35 // so we have to provide the appropriate handler on the OnMessageReady method.
  36 // There is a static_cast for the handler, and the compiler only performs the
  37 // cast if the first base class is Dispatcher.
  38 class PolicyBase : public Dispatcher, public TargetPolicy {
  39  public:
  40   PolicyBase();
  41
  42   // TargetPolicy:
  43   void AddRef() override;
  44   void Release() override;
  45   ResultCode SetTokenLevel(TokenLevel initial, TokenLevel lockdown) override;
  46   TokenLevel GetInitialTokenLevel() const override;
  47   TokenLevel GetLockdownTokenLevel() const override;
  48   ResultCode SetJobLevel(JobLevel job_level, uint32 ui_exceptions) override;
  49   ResultCode SetJobMemoryLimit(size_t memory_limit) override;
  50   ResultCode SetAlternateDesktop(bool alternate_winstation) override;
  51   base::string16 GetAlternateDesktop() const override;
  52   ResultCode CreateAlternateDesktop(bool alternate_winstation) override;
  53   void DestroyAlternateDesktop() override;
  54   ResultCode SetIntegrityLevel(IntegrityLevel integrity_level) override;
  55   IntegrityLevel GetIntegrityLevel() const override;
  56   ResultCode SetDelayedIntegrityLevel(IntegrityLevel integrity_level) override;
  57   ResultCode SetAppContainer(const wchar_t* sid) override;
  58   ResultCode SetCapability(const wchar_t* sid) override;
  59   ResultCode SetLowBox(const wchar_t* sid) override;
  60   ResultCode SetProcessMitigations(MitigationFlags flags) override;
  61   MitigationFlags GetProcessMitigations() override;
  62   ResultCode SetDelayedProcessMitigations(MitigationFlags flags) override;
  63   MitigationFlags GetDelayedProcessMitigations() const override;
  64   void SetStrictInterceptions() override;
  65   ResultCode SetStdoutHandle(HANDLE handle) override;
  66   ResultCode SetStderrHandle(HANDLE handle) override;
  67   ResultCode AddRule(SubSystem subsystem,
  68                      Semantics semantics,
  69                      const wchar_t* pattern) override;
  70   ResultCode AddDllToUnload(const wchar_t* dll_name) override;
  71   ResultCode AddKernelObjectToClose(const base::char16* handle_type,
  72                                     const base::char16* handle_name) override;
  73   void* AddHandleToShare(HANDLE handle) override;
  74
  75   // Dispatcher:
  76   Dispatcher* OnMessageReady(IPCParams* ipc,
  77                              CallbackGeneric* callback) override;
  78   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   // Returns the list of handles being shared with the target process.
 107   HandleList GetHandlesBeingShared();
 108
 109   // Closes the handles being shared with the target and clears out the list.
 110   void ClearSharedHandles();
 111
 112  private:
 113   ~PolicyBase() override;
 114
 115   // Test IPC providers.
 116   bool Ping(IPCInfo* ipc, void* cookie);
 117
 118   // Returns a dispatcher from ipc_targets_.
 119   Dispatcher* GetDispatcher(int ipc_tag);
 120
 121   // Sets up interceptions for a new target.
 122   bool SetupAllInterceptions(TargetProcess* target);
 123
 124   // Sets up the handle closer for a new target.
 125   bool SetupHandleCloser(TargetProcess* target);
 126
 127   ResultCode AddRuleInternal(SubSystem subsystem,
 128                              Semantics semantics,
 129                              const wchar_t* pattern);
 130
 131   // This lock synchronizes operations on the targets_ collection.
 132   CRITICAL_SECTION lock_;
 133   // Maintains the list of target process associated with this policy.
 134   // The policy takes ownership of them.
 135   typedef std::list<TargetProcess*> TargetSet;
 136   TargetSet targets_;
 137   // Standard object-lifetime reference counter.
 138   volatile LONG ref_count;
 139   // The user-defined global policy settings.
 140   TokenLevel lockdown_level_;
 141   TokenLevel initial_level_;
 142   JobLevel job_level_;
 143   uint32 ui_exceptions_;
 144   size_t memory_limit_;
 145   bool use_alternate_desktop_;
 146   bool use_alternate_winstation_;
 147   // Helps the file system policy initialization.
 148   bool file_system_init_;
 149   bool relaxed_interceptions_;
 150   HANDLE stdout_handle_;
 151   HANDLE stderr_handle_;
 152   IntegrityLevel integrity_level_;
 153   IntegrityLevel delayed_integrity_level_;
 154   MitigationFlags mitigations_;
 155   MitigationFlags delayed_mitigations_;
 156   // The array of objects that will answer IPC calls.
 157   Dispatcher* ipc_targets_[IPC_LAST_TAG];
 158   // Object in charge of generating the low level policy.
 159   LowLevelPolicy* policy_maker_;
 160   // Memory structure that stores the low level policy.
 161   PolicyGlobal* policy_;
 162   // The list of dlls to unload in the target process.
 163   std::vector<base::string16> blacklisted_dlls_;
 164   // This is a map of handle-types to names that we need to close in the
 165   // target process. A null set means we need to close all handles of the
 166   // given type.
 167   HandleCloser handle_closer_;
 168   std::vector<base::string16> capabilities_;
 169   scoped_ptr<AppContainerAttributes> appcontainer_list_;
 170   PSID lowbox_sid_;
 171   base::win::ScopedHandle lowbox_directory_;
 172
 173   static HDESK alternate_desktop_handle_;
 174   static HWINSTA alternate_winstation_handle_;
 175   static IntegrityLevel alternate_desktop_integrity_level_label_;
 176
 177   // Contains the list of handles being shared with the target process.
 178   // This list contains handles other than the stderr/stdout handles which are
 179   // shared with the target at times.
 180   std::vector<HANDLE> handles_to_share_;
 181
 182   DISALLOW_COPY_AND_ASSIGN(PolicyBase);
 183 };
 184
 185 }  // namespace sandbox
 186
 187 #endif  // SANDBOX_WIN_SRC_SANDBOX_POLICY_BASE_H_