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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.
// Defines ResolverThunk, the interface for classes that perform interceptions.
// For more datails see http://wiki/Main/ChromeSandboxInterceptionDesign
#include "base/basictypes.h"
#include "sandbox/src/nt_internals.h"
#ifndef SANDBOX_SRC_RESOLVER_H__
#define SANDBOX_SRC_RESOLVER_H__
namespace sandbox {
// A resolver is the object in charge of performing the actual interception of
// a function. There should be a concrete implementation of a resolver roughly
// per type of interception.
class ResolverThunk {
public:
ResolverThunk() {}
virtual ~ResolverThunk() {}
// Performs the actual interception of a function.
// target_name is an exported function from the module loaded at
// target_module, and must be replaced by interceptor_name, exported from
// interceptor_module. interceptor_entry_point can be provided instead of
// interceptor_name / interceptor_module.
// thunk_storage must point to a buffer on the child's address space, to hold
// the patch thunk, and related data. If provided, storage_used will receive
// the number of bytes used from thunk_storage.
//
// Example: (without error checking)
//
// size_t size = resolver.GetThunkSize();
// char* buffer = ::VirtualAllocEx(child_process, NULL, size,
// MEM_COMMIT, PAGE_READWRITE);
// resolver.Setup(ntdll_module, NULL, L"NtCreateFile", NULL,
// &MyReplacementFunction, buffer, size, NULL);
//
// In general, the idea is to allocate a single big buffer for all
// interceptions on the same dll, and call Setup n times.
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) = 0;
// Gets the address of function_name inside module (main exe).
virtual NTSTATUS ResolveInterceptor(const void* module,
const char* function_name,
const void** address);
// Gets the address of an exported function_name inside module.
virtual NTSTATUS ResolveTarget(const void* module,
const char* function_name,
void** address);
// Gets the required buffer size for this type of thunk.
virtual size_t GetThunkSize() const = 0;
protected:
// Performs basic initialization on behalf of a concrete instance of a
// resolver. That is, parameter validation and resolution of the target
// and the interceptor into the member variables.
//
// target_name is an exported function from the module loaded at
// target_module, and must be replaced by interceptor_name, exported from
// interceptor_module. interceptor_entry_point can be provided instead of
// interceptor_name / interceptor_module.
// thunk_storage must point to a buffer on the child's address space, to hold
// the patch thunk, and related data.
virtual NTSTATUS Init(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);
// Gets the required buffer size for the internal part of the thunk.
size_t GetInternalThunkSize() const;
// Initializes the internal part of the thunk.
// interceptor is the function to be called instead of original_function.
bool SetInternalThunk(void* storage, size_t storage_bytes,
const void* original_function, const void* interceptor);
// Holds the resolved interception target.
void* target_;
// Holds the resolved interception interceptor.
const void* interceptor_;
DISALLOW_EVIL_CONSTRUCTORS(ResolverThunk);
};
} // namespace sandbox
#endif // SANDBOX_SRC_RESOLVER_H__
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