215 lines
8.8 KiB
C++
215 lines
8.8 KiB
C++
/*************************************************************************/
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/* Copyright (c) 2015 dx, http://kaimi.ru */
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/* */
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/* Permission is hereby granted, free of charge, to any person */
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/* obtaining a copy of this software and associated documentation */
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/* files (the "Software"), to deal in the Software without */
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/* restriction, including without limitation the rights to use, */
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/* copy, modify, merge, publish, distribute, sublicense, and/or */
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/* sell copies of the Software, and to permit persons to whom the */
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/* Software is furnished to do so, subject to the following conditions: */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "pe_rebuilder.h"
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#include "pe_base.h"
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#include "pe_structures.h"
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#include "pe_exception.h"
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namespace pe_bliss
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{
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using namespace pe_win;
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//Rebuilds PE image headers
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//If strip_dos_header is true, DOS headers partially will be used for PE headers
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//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically
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//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers)
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void rebuild_pe(pe_base& pe, image_dos_header& dos_header, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import)
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{
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dos_header = pe.get_dos_header();
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if(strip_dos_header)
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{
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//Strip stub overlay
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pe.strip_stub_overlay();
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//BaseOfCode NT Headers field now overlaps
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//e_lfanew field, so we're acrually setting
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//e_lfanew with this call
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pe.set_base_of_code(8 * sizeof(uint16_t));
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}
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else
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{
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//Set start of PE headers
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dos_header.e_lfanew = sizeof(image_dos_header)
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+ pe_utils::align_up(static_cast<uint32_t>(pe.get_stub_overlay().size()), sizeof(uint32_t));
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}
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section_list& sections = pe.get_image_sections();
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//Calculate pointer to section data
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size_t ptr_to_section_data = (strip_dos_header ? 8 * sizeof(uint16_t) : sizeof(image_dos_header)) + pe.get_sizeof_nt_header()
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+ pe_utils::align_up(pe.get_stub_overlay().size(), sizeof(uint32_t))
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- sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes())
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+ sections.size() * sizeof(image_section_header);
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if(save_bound_import && pe.has_bound_import())
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{
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//It will be aligned to DWORD, because we're aligning to DWORD everything above it
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pe.set_directory_rva(image_directory_entry_bound_import, static_cast<uint32_t>(ptr_to_section_data));
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ptr_to_section_data += pe.get_directory_size(image_directory_entry_bound_import);
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}
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ptr_to_section_data = pe_utils::align_up(ptr_to_section_data, pe.get_file_alignment());
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//Set size of headers and size of optional header
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if(change_size_of_headers)
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{
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if(!pe.get_image_sections().empty())
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{
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if(static_cast<uint32_t>(ptr_to_section_data) > (*sections.begin()).get_virtual_address())
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throw pe_exception("Headers of PE file are too long. Try to strip STUB or don't build bound import", pe_exception::cannot_rebuild_image);
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}
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pe.set_size_of_headers(static_cast<uint32_t>(ptr_to_section_data));
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}
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//Set number of sections in PE header
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pe.update_number_of_sections();
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pe.update_image_size();
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pe.set_size_of_optional_header(static_cast<uint16_t>(pe.get_sizeof_opt_headers()
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- sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes())));
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//Recalculate pointer to raw data according to section list
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for(section_list::iterator it = sections.begin(); it != sections.end(); ++it)
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{
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//Save section headers PointerToRawData
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(*it).set_pointer_to_raw_data(static_cast<uint32_t>(ptr_to_section_data));
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ptr_to_section_data += (*it).get_aligned_raw_size(pe.get_file_alignment());
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}
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}
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//Rebuild PE image and write it to "out" ostream
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//If strip_dos_header is true, DOS headers partially will be used for PE headers
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//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically
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//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers)
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void rebuild_pe(pe_base& pe, std::ostream& out, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import)
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{
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if(out.bad())
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throw pe_exception("Stream is bad", pe_exception::stream_is_bad);
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if(save_bound_import && pe.has_bound_import())
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{
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if(pe.section_data_length_from_rva(pe.get_directory_rva(image_directory_entry_bound_import), pe.get_directory_rva(image_directory_entry_bound_import), section_data_raw, true)
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< pe.get_directory_size(image_directory_entry_bound_import))
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throw pe_exception("Incorrect bound import directory", pe_exception::incorrect_bound_import_directory);
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}
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//Change ostream state
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out.exceptions(std::ios::goodbit);
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out.clear();
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uint32_t original_bound_import_rva = pe.has_bound_import() ? pe.get_directory_rva(image_directory_entry_bound_import) : 0;
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if(original_bound_import_rva && original_bound_import_rva > pe.get_size_of_headers())
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{
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//No need to do anything with bound import directory
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//if it is placed inside of any section, not headers
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original_bound_import_rva = 0;
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save_bound_import = false;
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}
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{
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image_dos_header dos_header;
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//Rebuild PE image headers
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rebuild_pe(pe, dos_header, strip_dos_header, change_size_of_headers, save_bound_import);
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//Write DOS header
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out.write(reinterpret_cast<const char*>(&dos_header), strip_dos_header ? 8 * sizeof(uint16_t) : sizeof(image_dos_header));
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}
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//If we have stub overlay, write it too
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{
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const std::string& stub = pe.get_stub_overlay();
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if(stub.size())
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{
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out.write(stub.data(), stub.size());
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size_t aligned_size = pe_utils::align_up(stub.size(), sizeof(uint32_t));
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//Align PE header, which is right after rich overlay
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while(aligned_size > stub.size())
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{
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out.put('\0');
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--aligned_size;
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}
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}
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}
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//Write NT headers
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out.write(static_cast<const pe_base&>(pe).get_nt_headers_ptr(), pe.get_sizeof_nt_header()
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- sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes()));
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//Write section headers
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const section_list& sections = pe.get_image_sections();
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for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it)
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{
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if(it == sections.end() - 1) //If last section encountered
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{
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image_section_header header((*it).get_raw_header());
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header.SizeOfRawData = static_cast<uint32_t>((*it).get_raw_data().length()); //Set non-aligned actual data length for it
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out.write(reinterpret_cast<const char*>(&header), sizeof(image_section_header));
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}
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else
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{
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out.write(reinterpret_cast<const char*>(&(*it).get_raw_header()), sizeof(image_section_header));
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}
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}
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//Write bound import data if requested
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if(save_bound_import && pe.has_bound_import())
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{
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out.write(pe.section_data_from_rva(original_bound_import_rva, section_data_raw, true),
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pe.get_directory_size(image_directory_entry_bound_import));
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}
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//Write section data finally
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for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it)
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{
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const section& s = *it;
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std::streamoff wpos = out.tellp();
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//Fill unused overlay data between sections with null bytes
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for(unsigned int i = 0; i < s.get_pointer_to_raw_data() - wpos; i++)
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out.put(0);
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//Write raw section data
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out.write(s.get_raw_data().data(), s.get_raw_data().length());
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}
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}
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//Rebuild PE image and write it to "out" file
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//If strip_dos_header is true, DOS headers partially will be used for PE headers
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//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically
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//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers)
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void rebuild_pe(pe_base& pe, const char* out, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import)
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{
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std::ofstream pe_file(out, std::ios::out | std::ios::binary | std::ios::trunc);
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if(!pe_file)
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{
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throw pe_exception("Error in open file.", pe_exception::stream_is_bad);
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}
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rebuild_pe(pe, pe_file, strip_dos_header, change_size_of_headers, save_bound_import);
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}
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}
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