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      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 SANDBOX_SRC_SERVICE_RESOLVER_H__
      6 #define SANDBOX_SRC_SERVICE_RESOLVER_H__
      7 
      8 #include "sandbox/win/src/nt_internals.h"
      9 #include "sandbox/win/src/resolver.h"
     10 
     11 namespace sandbox {
     12 
     13 // This is the concrete resolver used to perform service-call type functions
     14 // inside ntdll.dll.
     15 class ServiceResolverThunk : public ResolverThunk {
     16  public:
     17   // The service resolver needs a child process to write to.
     18   ServiceResolverThunk(HANDLE process, bool relaxed)
     19       : process_(process), ntdll_base_(NULL), win2k_(false),
     20         relaxed_(relaxed), relative_jump_(0) {}
     21   virtual ~ServiceResolverThunk() {}
     22 
     23   // Implementation of Resolver::Setup.
     24   virtual NTSTATUS Setup(const void* target_module,
     25                          const void* interceptor_module,
     26                          const char* target_name,
     27                          const char* interceptor_name,
     28                          const void* interceptor_entry_point,
     29                          void* thunk_storage,
     30                          size_t storage_bytes,
     31                          size_t* storage_used);
     32 
     33   // Implementation of Resolver::ResolveInterceptor.
     34   virtual NTSTATUS ResolveInterceptor(const void* module,
     35                                       const char* function_name,
     36                                       const void** address);
     37 
     38   // Implementation of Resolver::ResolveTarget.
     39   virtual NTSTATUS ResolveTarget(const void* module,
     40                                  const char* function_name,
     41                                  void** address);
     42 
     43   // Implementation of Resolver::GetThunkSize.
     44   virtual size_t GetThunkSize() const;
     45 
     46   // Call this to set up ntdll_base_ which will allow for local patches.
     47   virtual void AllowLocalPatches();
     48 
     49  protected:
     50   // The unit test will use this member to allow local patch on a buffer.
     51   HMODULE ntdll_base_;
     52 
     53   // Handle of the child process.
     54   HANDLE process_;
     55 
     56  protected:
     57   // Keeps track of a Windows 2000 resolver.
     58   bool win2k_;
     59 
     60  private:
     61   // Returns true if the code pointer by target_ corresponds to the expected
     62   // type of function. Saves that code on the first part of the thunk pointed
     63   // by local_thunk (should be directly accessible from the parent).
     64   virtual bool IsFunctionAService(void* local_thunk) const;
     65 
     66   // Performs the actual patch of target_.
     67   // local_thunk must be already fully initialized, and the first part must
     68   // contain the original code. The real type of this buffer is ServiceFullThunk
     69   // (yes, private). remote_thunk (real type ServiceFullThunk), must be
     70   // allocated on the child, and will contain the thunk data, after this call.
     71   // Returns the apropriate status code.
     72   virtual NTSTATUS PerformPatch(void* local_thunk, void* remote_thunk);
     73 
     74   // Provides basically the same functionality as IsFunctionAService but it
     75   // continues even if it does not recognize the function code. remote_thunk
     76   // is the address of our memory on the child.
     77   bool SaveOriginalFunction(void* local_thunk, void* remote_thunk);
     78 
     79   // true if we are allowed to patch already-patched functions.
     80   bool relaxed_;
     81   ULONG relative_jump_;
     82 
     83   DISALLOW_COPY_AND_ASSIGN(ServiceResolverThunk);
     84 };
     85 
     86 // This is the concrete resolver used to perform service-call type functions
     87 // inside ntdll.dll on WOW64 (32 bit ntdll on 64 bit Vista).
     88 class Wow64ResolverThunk : public ServiceResolverThunk {
     89  public:
     90   // The service resolver needs a child process to write to.
     91   Wow64ResolverThunk(HANDLE process, bool relaxed)
     92       : ServiceResolverThunk(process, relaxed) {}
     93   virtual ~Wow64ResolverThunk() {}
     94 
     95  private:
     96   virtual bool IsFunctionAService(void* local_thunk) const;
     97 
     98   DISALLOW_COPY_AND_ASSIGN(Wow64ResolverThunk);
     99 };
    100 
    101 // This is the concrete resolver used to perform service-call type functions
    102 // inside ntdll.dll on WOW64 for Windows 8.
    103 class Wow64W8ResolverThunk : public ServiceResolverThunk {
    104  public:
    105   // The service resolver needs a child process to write to.
    106   Wow64W8ResolverThunk(HANDLE process, bool relaxed)
    107       : ServiceResolverThunk(process, relaxed) {}
    108   virtual ~Wow64W8ResolverThunk() {}
    109 
    110  private:
    111   virtual bool IsFunctionAService(void* local_thunk) const;
    112 
    113   DISALLOW_COPY_AND_ASSIGN(Wow64W8ResolverThunk);
    114 };
    115 
    116 // This is the concrete resolver used to perform service-call type functions
    117 // inside ntdll.dll on Windows 2000 and XP pre SP2.
    118 class Win2kResolverThunk : public ServiceResolverThunk {
    119  public:
    120   // The service resolver needs a child process to write to.
    121   Win2kResolverThunk(HANDLE process, bool relaxed)
    122       : ServiceResolverThunk(process, relaxed) {
    123     win2k_ = true;
    124   }
    125   virtual ~Win2kResolverThunk() {}
    126 
    127  private:
    128   virtual bool IsFunctionAService(void* local_thunk) const;
    129 
    130   DISALLOW_COPY_AND_ASSIGN(Win2kResolverThunk);
    131 };
    132 
    133 // This is the concrete resolver used to perform service-call type functions
    134 // inside ntdll.dll on Windows 8.
    135 class Win8ResolverThunk : public ServiceResolverThunk {
    136  public:
    137   // The service resolver needs a child process to write to.
    138   Win8ResolverThunk(HANDLE process, bool relaxed)
    139       : ServiceResolverThunk(process, relaxed) {}
    140   virtual ~Win8ResolverThunk() {}
    141 
    142  private:
    143   virtual bool IsFunctionAService(void* local_thunk) const;
    144 
    145   DISALLOW_COPY_AND_ASSIGN(Win8ResolverThunk);
    146 };
    147 
    148 }  // namespace sandbox
    149 
    150 
    151 #endif  // SANDBOX_SRC_SERVICE_RESOLVER_H__
    152