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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_SRC_SERVICE_RESOLVER_H__
#define SANDBOX_SRC_SERVICE_RESOLVER_H__
#include "sandbox/win/src/nt_internals.h"
#include "sandbox/win/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),
relaxed_(relaxed), relative_jump_(0) {}
~ServiceResolverThunk() override {}
// Implementation of Resolver::Setup.
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) override;
// Implementation of Resolver::ResolveInterceptor.
NTSTATUS ResolveInterceptor(const void* module,
const char* function_name,
const void** address) override;
// Implementation of Resolver::ResolveTarget.
NTSTATUS ResolveTarget(const void* module,
const char* function_name,
void** address) override;
// Implementation of Resolver::GetThunkSize.
size_t GetThunkSize() const override;
// Call this to set up ntdll_base_ which will allow for local patches.
virtual void AllowLocalPatches();
// Verifies that the function specified by |target_name| in |target_module| is
// a service and copies the data from that function into |thunk_storage|. If
// |storage_bytes| is too small, then the method fails.
virtual NTSTATUS CopyThunk(const void* target_module,
const char* target_name,
BYTE* thunk_storage,
size_t storage_bytes,
size_t* storage_used);
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_;
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_COPY_AND_ASSIGN(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) {}
~Wow64ResolverThunk() override {}
private:
bool IsFunctionAService(void* local_thunk) const override;
DISALLOW_COPY_AND_ASSIGN(Wow64ResolverThunk);
};
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll on WOW64 for Windows 8.
class Wow64W8ResolverThunk : public ServiceResolverThunk {
public:
// The service resolver needs a child process to write to.
Wow64W8ResolverThunk(HANDLE process, bool relaxed)
: ServiceResolverThunk(process, relaxed) {}
~Wow64W8ResolverThunk() override {}
private:
bool IsFunctionAService(void* local_thunk) const override;
DISALLOW_COPY_AND_ASSIGN(Wow64W8ResolverThunk);
};
// This is the concrete resolver used to perform service-call type functions
// inside ntdll.dll on Windows 8.
class Win8ResolverThunk : public ServiceResolverThunk {
public:
// The service resolver needs a child process to write to.
Win8ResolverThunk(HANDLE process, bool relaxed)
: ServiceResolverThunk(process, relaxed) {}
~Win8ResolverThunk() override {}
private:
bool IsFunctionAService(void* local_thunk) const override;
DISALLOW_COPY_AND_ASSIGN(Win8ResolverThunk);
};
} // namespace sandbox
#endif // SANDBOX_SRC_SERVICE_RESOLVER_H__
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