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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef SANDBOX_SRC_SERVICE_RESOLVER_H__
#define SANDBOX_SRC_SERVICE_RESOLVER_H__
#include "sandbox/src/nt_internals.h"
#include "sandbox/src/resolver.h"
namespace sandbox {
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll.
class ServiceResolverThunk : public ResolverThunk {
public:
// The service resolver needs a child process to write to.
ServiceResolverThunk(HANDLE process, bool relaxed)
: process_(process), ntdll_base_(NULL), win2k_(false),
relaxed_(relaxed), relative_jump_(0) {}
virtual ~ServiceResolverThunk() {}
// Implementation of Resolver::Setup.
virtual NTSTATUS Setup(const void* target_module,
const void* interceptor_module,
const char* target_name,
const char* interceptor_name,
const void* interceptor_entry_point,
void* thunk_storage,
size_t storage_bytes,
size_t* storage_used);
// Implementation of Resolver::ResolveInterceptor.
virtual NTSTATUS ResolveInterceptor(const void* module,
const char* function_name,
const void** address);
// Implementation of Resolver::ResolveTarget.
virtual NTSTATUS ResolveTarget(const void* module,
const char* function_name,
void** address);
// Implementation of Resolver::GetThunkSize.
virtual size_t GetThunkSize() const;
protected:
// The unit test will use this member to allow local patch on a buffer.
HMODULE ntdll_base_;
// Handle of the child process.
HANDLE process_;
protected:
// Keeps track of a Windows 2000 resolver.
bool win2k_;
private:
// Returns true if the code pointer by target_ corresponds to the expected
// type of function. Saves that code on the first part of the thunk pointed
// by local_thunk (should be directly accessible from the parent).
virtual bool IsFunctionAService(void* local_thunk) const;
// Performs the actual patch of target_.
// local_thunk must be already fully initialized, and the first part must
// contain the original code. The real type of this buffer is ServiceFullThunk
// (yes, private). remote_thunk (real type ServiceFullThunk), must be
// allocated on the child, and will contain the thunk data, after this call.
// Returns the apropriate status code.
virtual NTSTATUS PerformPatch(void* local_thunk, void* remote_thunk);
// Provides basically the same functionality as IsFunctionAService but it
// continues even if it does not recognize the function code. remote_thunk
// is the address of our memory on the child.
bool SaveOriginalFunction(void* local_thunk, void* remote_thunk);
// true if we are allowed to patch already-patched functions.
bool relaxed_;
ULONG relative_jump_;
DISALLOW_EVIL_CONSTRUCTORS(ServiceResolverThunk);
};
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll on WOW64 (32 bit ntdll on 64 bit Vista).
class Wow64ResolverThunk : public ServiceResolverThunk {
public:
// The service resolver needs a child process to write to.
Wow64ResolverThunk(HANDLE process, bool relaxed)
: ServiceResolverThunk(process, relaxed) {}
virtual ~Wow64ResolverThunk() {}
private:
virtual bool IsFunctionAService(void* local_thunk) const;
DISALLOW_EVIL_CONSTRUCTORS(Wow64ResolverThunk);
};
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll on Windows 2000 and XP pre SP2.
class Win2kResolverThunk : public ServiceResolverThunk {
public:
// The service resolver needs a child process to write to.
Win2kResolverThunk(HANDLE process, bool relaxed)
: ServiceResolverThunk(process, relaxed) {
win2k_ = true;
}
virtual ~Win2kResolverThunk() {}
private:
virtual bool IsFunctionAService(void* local_thunk) const;
DISALLOW_EVIL_CONSTRUCTORS(Win2kResolverThunk);
};
} // namespace sandbox
#endif // SANDBOX_SRC_SERVICE_RESOLVER_H__
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