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