273 lines
11 KiB
C++
273 lines
11 KiB
C++
#include "views/view_yara.hpp"
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#include <hex/providers/provider.hpp>
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#include <hex/helpers/utils.hpp>
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#include <hex/helpers/file.hpp>
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#include <hex/helpers/logger.hpp>
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#include <yara.h>
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#include <filesystem>
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#include <thread>
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#include <imgui_imhex_extensions.h>
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#include <hex/helpers/paths.hpp>
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namespace hex {
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namespace fs = std::filesystem;
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ViewYara::ViewYara() : View("hex.view.yara.name") {
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yr_initialize();
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this->reloadRules();
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}
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ViewYara::~ViewYara() {
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yr_finalize();
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}
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void ViewYara::drawContent() {
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if (ImGui::Begin(View::toWindowName("hex.view.yara.name").c_str(), &this->getWindowOpenState(), ImGuiWindowFlags_NoCollapse)) {
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if (!this->m_matching && !this->m_errorMessage.empty()) {
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View::showErrorPopup("hex.view.yara.error"_lang + this->m_errorMessage.data());
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this->m_errorMessage.clear();
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}
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ImGui::TextUnformatted("hex.view.yara.header.rules"_lang);
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ImGui::Separator();
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if (this->m_rules.empty()) {
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ImGui::TextColored(ImVec4(0.92F, 0.25F, 0.2F, 1.0F), "%s", static_cast<const char*>("hex.view.yara.no_rules"_lang));
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if (ImGui::Button("hex.view.yara.reload"_lang)) this->reloadRules();
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} else {
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ImGui::Disabled([this]{
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if (ImGui::BeginCombo("hex.view.yara.header.rules"_lang, this->m_rules[this->m_selectedRule].first.c_str())) {
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for (u32 i = 0; i < this->m_rules.size(); i++) {
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const bool selected = (this->m_selectedRule == i);
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if (ImGui::Selectable(this->m_rules[i].first.c_str(), selected))
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this->m_selectedRule = i;
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if (selected)
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ImGui::SetItemDefaultFocus();
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}
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ImGui::EndCombo();
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}
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ImGui::SameLine();
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if (ImGui::Button("hex.view.yara.reload"_lang)) this->reloadRules();
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if (ImGui::Button("hex.view.yara.match"_lang)) this->applyRules();
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}, this->m_matching);
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if (this->m_matching) {
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ImGui::SameLine();
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ImGui::TextSpinner("hex.view.yara.matching"_lang);
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}
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}
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ImGui::NewLine();
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ImGui::TextUnformatted("hex.view.yara.header.matches"_lang);
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ImGui::Separator();
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if (ImGui::BeginTable("matches", 4, ImGuiTableFlags_Borders | ImGuiTableFlags_Resizable | ImGuiTableFlags_Sortable | ImGuiTableFlags_Reorderable | ImGuiTableFlags_RowBg | ImGuiTableFlags_ScrollY)) {
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ImGui::TableSetupScrollFreeze(0, 1);
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ImGui::TableSetupColumn("hex.view.yara.matches.identifier"_lang);
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ImGui::TableSetupColumn("hex.view.yara.matches.variable"_lang);
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ImGui::TableSetupColumn("hex.common.address"_lang);
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ImGui::TableSetupColumn("hex.common.size"_lang);
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ImGui::TableHeadersRow();
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ImGuiListClipper clipper;
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clipper.Begin(this->m_matches.size());
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while (clipper.Step()) {
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for (u32 i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) {
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auto &[identifier, variableName, address, size, wholeDataMatch] = this->m_matches[i];
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ImGui::TableNextRow();
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ImGui::TableNextColumn();
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ImGui::PushID(i);
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if (ImGui::Selectable("match", false, ImGuiSelectableFlags_SpanAllColumns | ImGuiSelectableFlags_AllowItemOverlap)) {
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EventManager::post<RequestSelectionChange>(Region { u64(address), size_t(size) });
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}
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ImGui::PopID();
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ImGui::SameLine();
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ImGui::TextUnformatted(identifier.c_str());
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ImGui::TableNextColumn();
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ImGui::TextUnformatted(variableName.c_str());
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if (!wholeDataMatch) {
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ImGui::TableNextColumn();
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ImGui::Text("0x%llX : 0x%llX", address, address + size - 1);
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ImGui::TableNextColumn();
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ImGui::Text("0x%lX", size);
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} else {
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ImGui::TableNextColumn();
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ImGui::TextColored(ImVec4(0.92F, 0.25F, 0.2F, 1.0F), "%s", static_cast<const char*>("hex.view.yara.whole_data"_lang));
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ImGui::TableNextColumn();
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ImGui::TextUnformatted("");
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}
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}
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}
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clipper.End();
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ImGui::EndTable();
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}
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}
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ImGui::End();
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}
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void ViewYara::drawMenu() {
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}
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void ViewYara::reloadRules() {
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this->m_rules.clear();
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for (auto path : hex::getPath(ImHexPath::Yara)) {
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if (!fs::exists(path))
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continue;
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for (const auto &entry : fs::recursive_directory_iterator(path)) {
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if (entry.is_regular_file() && entry.path().extension() == ".yar") {
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this->m_rules.push_back({ fs::relative(entry.path(), fs::path(path)).string(), entry.path().string() });
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}
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}
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}
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}
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void ViewYara::applyRules() {
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this->m_matches.clear();
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this->m_errorMessage.clear();
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this->m_matching = true;
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std::thread([this] {
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YR_COMPILER *compiler = nullptr;
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yr_compiler_create(&compiler);
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ON_SCOPE_EXIT {
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yr_compiler_destroy(compiler);
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this->m_matching = false;
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};
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yr_compiler_set_include_callback(
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compiler,
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[](const char *includeName, const char *callingRuleFileName, const char *callingRuleNamespace, void *userData) -> const char * {
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auto currFilePath = static_cast<const char*>(userData);
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File file((fs::path(currFilePath).parent_path() / includeName).string(), File::Mode::Read);
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if (!file.isValid())
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return nullptr;
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auto size = file.getSize();
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char *buffer = new char[size + 1];
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file.readBuffer(reinterpret_cast<u8*>(buffer), size);
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buffer[size] = 0x00;
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return buffer;
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},
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[](const char *ptr, void *userData) {
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delete[] ptr;
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},
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this->m_rules[this->m_selectedRule].second.data());
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File file(this->m_rules[this->m_selectedRule].second, File::Mode::Read);
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if (!file.isValid()) return;
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if (yr_compiler_add_file(compiler, file.getHandle(), nullptr, nullptr) != 0) {
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this->m_errorMessage.resize(0xFFFF);
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yr_compiler_get_error_message(compiler, this->m_errorMessage.data(), this->m_errorMessage.size());
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return;
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}
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YR_RULES *rules;
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yr_compiler_get_rules(compiler, &rules);
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ON_SCOPE_EXIT { yr_rules_destroy(rules); };
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std::vector<YaraMatch> newMatches;
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YR_MEMORY_BLOCK_ITERATOR iterator;
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struct ScanContext {
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std::vector<u8> buffer;
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YR_MEMORY_BLOCK currBlock;
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};
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ScanContext context;
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context.currBlock.base = 0;
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context.currBlock.fetch_data = [](auto *block) -> const u8* {
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auto &context = *static_cast<ScanContext*>(block->context);
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auto provider = ImHexApi::Provider::get();
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context.buffer.resize(std::min<u64>(0xF'FFFF, provider->getSize() - context.currBlock.base));
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if (context.buffer.empty()) return nullptr;
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provider->readRelative(context.currBlock.base, context.buffer.data(), context.buffer.size());
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return context.buffer.data();
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};
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iterator.file_size = [](auto *iterator) -> u64 {
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return ImHexApi::Provider::get()->getSize();
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};
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iterator.context = &context;
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iterator.first = [](YR_MEMORY_BLOCK_ITERATOR* iterator) -> YR_MEMORY_BLOCK* {
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auto &context = *static_cast<ScanContext*>(iterator->context);
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context.currBlock.base = 0;
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context.currBlock.size = 0;
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context.buffer.clear();
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iterator->last_error = ERROR_SUCCESS;
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return iterator->next(iterator);
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};
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iterator.next = [](YR_MEMORY_BLOCK_ITERATOR* iterator) -> YR_MEMORY_BLOCK* {
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auto &context = *static_cast<ScanContext*>(iterator->context);
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u64 address = context.currBlock.base + context.currBlock.size;
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iterator->last_error = ERROR_SUCCESS;
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context.currBlock.base = address;
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context.currBlock.size = std::min<u64>(0xF'FFFF, ImHexApi::Provider::get()->getSize() - address);
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context.currBlock.context = &context;
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if (context.currBlock.size == 0) return nullptr;
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return &context.currBlock;
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};
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yr_rules_scan_mem_blocks(rules, &iterator, 0, [](YR_SCAN_CONTEXT* context, int message, void *data, void *userData) -> int {
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if (message == CALLBACK_MSG_RULE_MATCHING) {
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auto &newMatches = *static_cast<std::vector<YaraMatch>*>(userData);
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auto rule = static_cast<YR_RULE*>(data);
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YR_STRING *string;
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YR_MATCH *match;
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if (rule->strings != nullptr) {
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yr_rule_strings_foreach(rule, string) {
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yr_string_matches_foreach(context, string, match) {
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newMatches.push_back({ rule->identifier, string->identifier, match->offset, match->match_length, false });
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}
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}
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} else {
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newMatches.push_back({ rule->identifier, "", 0, 0, true });
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}
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}
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return CALLBACK_CONTINUE;
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}, &newMatches, 0);
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std::copy(newMatches.begin(), newMatches.end(), std::back_inserter(this->m_matches));
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}).detach();
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}
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} |