mirror of
https://github.com/rapid7/metasploit-payloads
synced 2025-03-30 22:19:17 +02:00
116 lines
4.9 KiB
C
116 lines
4.9 KiB
C
//===============================================================================================//
|
|
// Copyright (c) 2008, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
|
|
// 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 Harmony Security 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.
|
|
//===============================================================================================//
|
|
#include "GetProcAddressR.h"
|
|
//===============================================================================================//
|
|
// We implement a minimal GetProcAddress to avoid using the native kernel32!GetProcAddress which
|
|
// wont be able to resolve exported addresses in reflectivly loaded librarys.
|
|
FARPROC WINAPI GetProcAddressR( HANDLE hModule, LPCSTR lpProcName )
|
|
{
|
|
DWORD dwLibraryAddress = 0;
|
|
FARPROC fpResult = NULL;
|
|
|
|
if( hModule == NULL )
|
|
return NULL;
|
|
|
|
// a module handle is really its base address
|
|
dwLibraryAddress = (DWORD)hModule;
|
|
|
|
__try
|
|
{
|
|
DWORD dwAddressArray = 0;
|
|
DWORD dwNameArray = 0;
|
|
DWORD dwNameOrdinals = 0;
|
|
PIMAGE_NT_HEADERS32 pNtHeaders = NULL;
|
|
PIMAGE_DATA_DIRECTORY pDataDirectory = NULL;
|
|
PIMAGE_EXPORT_DIRECTORY pExportDirectory = NULL;
|
|
|
|
// get the VA of the modules NT Header
|
|
pNtHeaders = (PIMAGE_NT_HEADERS32)(dwLibraryAddress + ((PIMAGE_DOS_HEADER)dwLibraryAddress)->e_lfanew);
|
|
|
|
pDataDirectory = (PIMAGE_DATA_DIRECTORY)&pNtHeaders->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_EXPORT ];
|
|
|
|
// get the VA of the export directory
|
|
pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)( dwLibraryAddress + pDataDirectory->VirtualAddress );
|
|
|
|
// get the VA for the array of addresses
|
|
dwAddressArray = ( dwLibraryAddress + pExportDirectory->AddressOfFunctions );
|
|
|
|
// get the VA for the array of name pointers
|
|
dwNameArray = ( dwLibraryAddress + pExportDirectory->AddressOfNames );
|
|
|
|
// get the VA for the array of name ordinals
|
|
dwNameOrdinals = ( dwLibraryAddress + pExportDirectory->AddressOfNameOrdinals );
|
|
|
|
// test if we are importing by name or by ordinal...
|
|
if( ((DWORD)lpProcName & 0xFFFF0000 ) == 0x00000000 )
|
|
{
|
|
// import by ordinal...
|
|
|
|
// use the import ordinal (- export ordinal base) as an index into the array of addresses
|
|
dwAddressArray += ( ( IMAGE_ORDINAL32( (DWORD)lpProcName ) - pExportDirectory->Base ) * sizeof(DWORD) );
|
|
|
|
// resolve the address for this imported function
|
|
fpResult = (FARPROC)( dwLibraryAddress + DEREF_32(dwAddressArray) );
|
|
}
|
|
else
|
|
{
|
|
// import by name...
|
|
DWORD dwCounter = pExportDirectory->NumberOfNames;
|
|
while( dwCounter-- )
|
|
{
|
|
char * cpExportedFunctionName = (char *)(dwLibraryAddress + DEREF_32( dwNameArray ));
|
|
|
|
// test if we have a match...
|
|
if( strcmp( cpExportedFunctionName, lpProcName ) == 0 )
|
|
{
|
|
// use the functions name ordinal as an index into the array of name pointers
|
|
dwAddressArray += ( DEREF_16( dwNameOrdinals ) * sizeof(DWORD) );
|
|
|
|
// calculate the virtual address for the function
|
|
fpResult = (FARPROC)(dwLibraryAddress + DEREF_32( dwAddressArray ));
|
|
|
|
// finish...
|
|
break;
|
|
}
|
|
|
|
// get the next exported function name
|
|
dwNameArray += sizeof(DWORD);
|
|
|
|
// get the next exported function name ordinal
|
|
dwNameOrdinals += sizeof(WORD);
|
|
}
|
|
}
|
|
}
|
|
__except( EXCEPTION_EXECUTE_HANDLER )
|
|
{
|
|
fpResult = NULL;
|
|
}
|
|
|
|
return fpResult;
|
|
}
|
|
//===============================================================================================//
|