diff options
Diffstat (limited to 'tools/pe_bliss/pe_rebuilder.cpp')
-rw-r--r-- | tools/pe_bliss/pe_rebuilder.cpp | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/tools/pe_bliss/pe_rebuilder.cpp b/tools/pe_bliss/pe_rebuilder.cpp new file mode 100644 index 0000000000..faf5803b8c --- /dev/null +++ b/tools/pe_bliss/pe_rebuilder.cpp @@ -0,0 +1,214 @@ +/*************************************************************************/ +/* Copyright (c) 2015 dx, http://kaimi.ru */ +/* */ +/* Permission is hereby granted, free of charge, to any person */ +/* obtaining a copy of this software and associated documentation */ +/* files (the "Software"), to deal in the Software without */ +/* restriction, including without limitation the rights to use, */ +/* copy, modify, merge, publish, distribute, sublicense, and/or */ +/* sell copies of the Software, and to permit persons to whom the */ +/* Software is furnished to do so, subject to the following conditions: */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ +#include "pe_rebuilder.h" +#include "pe_base.h" +#include "pe_structures.h" +#include "pe_exception.h" + +namespace pe_bliss +{ +using namespace pe_win; + +//Rebuilds PE image headers +//If strip_dos_header is true, DOS headers partially will be used for PE headers +//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically +//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers) +void rebuild_pe(pe_base& pe, image_dos_header& dos_header, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import) +{ + dos_header = pe.get_dos_header(); + + if(strip_dos_header) + { + //Strip stub overlay + pe.strip_stub_overlay(); + //BaseOfCode NT Headers field now overlaps + //e_lfanew field, so we're acrually setting + //e_lfanew with this call + pe.set_base_of_code(8 * sizeof(uint16_t)); + } + else + { + //Set start of PE headers + dos_header.e_lfanew = sizeof(image_dos_header) + + pe_utils::align_up(static_cast<uint32_t>(pe.get_stub_overlay().size()), sizeof(uint32_t)); + } + + section_list& sections = pe.get_image_sections(); + + //Calculate pointer to section data + size_t ptr_to_section_data = (strip_dos_header ? 8 * sizeof(uint16_t) : sizeof(image_dos_header)) + pe.get_sizeof_nt_header() + + pe_utils::align_up(pe.get_stub_overlay().size(), sizeof(uint32_t)) + - sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes()) + + sections.size() * sizeof(image_section_header); + + if(save_bound_import && pe.has_bound_import()) + { + //It will be aligned to DWORD, because we're aligning to DWORD everything above it + pe.set_directory_rva(image_directory_entry_bound_import, static_cast<uint32_t>(ptr_to_section_data)); + ptr_to_section_data += pe.get_directory_size(image_directory_entry_bound_import); + } + + ptr_to_section_data = pe_utils::align_up(ptr_to_section_data, pe.get_file_alignment()); + + //Set size of headers and size of optional header + if(change_size_of_headers) + { + if(!pe.get_image_sections().empty()) + { + if(static_cast<uint32_t>(ptr_to_section_data) > (*sections.begin()).get_virtual_address()) + 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); + } + + pe.set_size_of_headers(static_cast<uint32_t>(ptr_to_section_data)); + } + + //Set number of sections in PE header + pe.update_number_of_sections(); + + pe.update_image_size(); + + pe.set_size_of_optional_header(static_cast<uint16_t>(pe.get_sizeof_opt_headers() + - sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes()))); + + //Recalculate pointer to raw data according to section list + for(section_list::iterator it = sections.begin(); it != sections.end(); ++it) + { + //Save section headers PointerToRawData + (*it).set_pointer_to_raw_data(static_cast<uint32_t>(ptr_to_section_data)); + ptr_to_section_data += (*it).get_aligned_raw_size(pe.get_file_alignment()); + } +} + +//Rebuild PE image and write it to "out" ostream +//If strip_dos_header is true, DOS headers partially will be used for PE headers +//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically +//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers) +void rebuild_pe(pe_base& pe, std::ostream& out, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import) +{ + if(out.bad()) + throw pe_exception("Stream is bad", pe_exception::stream_is_bad); + + if(save_bound_import && pe.has_bound_import()) + { + 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) + < pe.get_directory_size(image_directory_entry_bound_import)) + throw pe_exception("Incorrect bound import directory", pe_exception::incorrect_bound_import_directory); + } + + //Change ostream state + out.exceptions(std::ios::goodbit); + out.clear(); + + uint32_t original_bound_import_rva = pe.has_bound_import() ? pe.get_directory_rva(image_directory_entry_bound_import) : 0; + if(original_bound_import_rva && original_bound_import_rva > pe.get_size_of_headers()) + { + //No need to do anything with bound import directory + //if it is placed inside of any section, not headers + original_bound_import_rva = 0; + save_bound_import = false; + } + + { + image_dos_header dos_header; + + //Rebuild PE image headers + rebuild_pe(pe, dos_header, strip_dos_header, change_size_of_headers, save_bound_import); + + //Write DOS header + out.write(reinterpret_cast<const char*>(&dos_header), strip_dos_header ? 8 * sizeof(uint16_t) : sizeof(image_dos_header)); + } + + //If we have stub overlay, write it too + { + const std::string& stub = pe.get_stub_overlay(); + if(stub.size()) + { + out.write(stub.data(), stub.size()); + size_t aligned_size = pe_utils::align_up(stub.size(), sizeof(uint32_t)); + //Align PE header, which is right after rich overlay + while(aligned_size > stub.size()) + { + out.put('\0'); + --aligned_size; + } + } + } + + //Write NT headers + out.write(static_cast<const pe_base&>(pe).get_nt_headers_ptr(), pe.get_sizeof_nt_header() + - sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes())); + + //Write section headers + const section_list& sections = pe.get_image_sections(); + for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it) + { + if(it == sections.end() - 1) //If last section encountered + { + image_section_header header((*it).get_raw_header()); + header.SizeOfRawData = static_cast<uint32_t>((*it).get_raw_data().length()); //Set non-aligned actual data length for it + out.write(reinterpret_cast<const char*>(&header), sizeof(image_section_header)); + } + else + { + out.write(reinterpret_cast<const char*>(&(*it).get_raw_header()), sizeof(image_section_header)); + } + } + + //Write bound import data if requested + if(save_bound_import && pe.has_bound_import()) + { + out.write(pe.section_data_from_rva(original_bound_import_rva, section_data_raw, true), + pe.get_directory_size(image_directory_entry_bound_import)); + } + + //Write section data finally + for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it) + { + const section& s = *it; + + std::streamoff wpos = out.tellp(); + + //Fill unused overlay data between sections with null bytes + for(unsigned int i = 0; i < s.get_pointer_to_raw_data() - wpos; i++) + out.put(0); + + //Write raw section data + out.write(s.get_raw_data().data(), s.get_raw_data().length()); + } +} + +//Rebuild PE image and write it to "out" file +//If strip_dos_header is true, DOS headers partially will be used for PE headers +//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically +//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers) +void rebuild_pe(pe_base& pe, const char* out, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import) +{ + std::ofstream pe_file(out, std::ios::out | std::ios::binary | std::ios::trunc); + if(!pe_file) + { + throw pe_exception("Error in open file.", pe_exception::stream_is_bad); + } + rebuild_pe(pe, pe_file, strip_dos_header, change_size_of_headers, save_bound_import); +} + + +} |