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ImHex/plugins/yara_rules/source/content/views/view_yara.cpp
WerWolv 74b5c93caf impr: Code style improvements
2023-12-27 16:33:49 +01:00

445 lines
19 KiB
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#include "content/views/view_yara.hpp"
#include <hex/api/content_registry.hpp>
#include <hex/api/project_file_manager.hpp>
#include <hex/helpers/fs.hpp>
#include <toasts/toast_notification.hpp>
#include <popups/popup_file_chooser.hpp>
// <yara/types.h>'s RE type has a zero-sized array, which is not allowed in ISO C++.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#include <yara.h>
#pragma GCC diagnostic pop
#include <filesystem>
#include <wolv/io/file.hpp>
#include <wolv/io/fs.hpp>
#include <wolv/utils/guards.hpp>
#include <wolv/literals.hpp>
namespace hex::plugin::yara {
using namespace wolv::literals;
ViewYara::ViewYara() : View::Window("hex.yara_rules.view.yara.name") {
yr_initialize();
ContentRegistry::FileHandler::add({ ".yar", ".yara" }, [](const auto &path) {
for (const auto &destPath : fs::getDefaultPaths(fs::ImHexPath::Yara)) {
if (wolv::io::fs::copyFile(path, destPath / path.filename(), std::fs::copy_options::overwrite_existing)) {
ui::ToastInfo::open("hex.yara_rules.view.yara.rule_added"_lang);
return true;
}
}
return false;
});
ProjectFile::registerPerProviderHandler({
.basePath = "yara.json",
.required = false,
.load = [this](prv::Provider *provider, const std::fs::path &basePath, const Tar &tar) -> bool {
auto fileContent = tar.readString(basePath);
if (fileContent.empty())
return true;
auto data = nlohmann::json::parse(fileContent.begin(), fileContent.end());
if (!data.contains("rules"))
return false;
auto &rules = data["rules"];
if (!rules.is_array())
return false;
m_matches.get(provider).clear();
for (auto &rule : rules) {
if (!rule.contains("name") || !rule.contains("path"))
return false;
auto &name = rule["name"];
auto &path = rule["path"];
if (!name.is_string() || !path.is_string())
return false;
m_rules.get(provider).emplace_back(std::fs::path(name.get<std::string>()), std::fs::path(path.get<std::string>()));
}
return true;
},
.store = [this](prv::Provider *provider, const std::fs::path &basePath, const Tar &tar) -> bool {
nlohmann::json data;
data["rules"] = nlohmann::json::array();
for (auto &[name, path] : m_rules.get(provider)) {
data["rules"].push_back({
{ "name", wolv::util::toUTF8String(name) },
{ "path", wolv::util::toUTF8String(path) }
});
}
tar.writeString(basePath, data.dump(4));
return true;
}
});
}
ViewYara::~ViewYara() {
yr_finalize();
}
void ViewYara::drawContent() {
ImGuiExt::Header("hex.yara_rules.view.yara.header.rules"_lang, true);
if (ImGui::BeginListBox("##rules", ImVec2(-FLT_MIN, ImGui::GetTextLineHeightWithSpacing() * 5))) {
for (u32 i = 0; i < m_rules->size(); i++) {
const bool selected = (m_selectedRule == i);
if (ImGui::Selectable(wolv::util::toUTF8String((*m_rules)[i].first).c_str(), selected)) {
m_selectedRule = i;
}
}
ImGui::EndListBox();
}
if (ImGuiExt::IconButton(ICON_VS_ADD, ImGui::GetStyleColorVec4(ImGuiCol_Text))) {
const auto basePaths = fs::getDefaultPaths(fs::ImHexPath::Yara);
std::vector<std::fs::path> paths;
for (const auto &path : basePaths) {
std::error_code error;
for (const auto &entry : std::fs::recursive_directory_iterator(path, error)) {
if (!entry.is_regular_file()) continue;
if (entry.path().extension() != ".yara" && entry.path().extension() != ".yar") continue;
paths.push_back(entry);
}
}
/*PopupFileChooser::open(basePaths, paths, std::vector<hex::fs::ItemFilter>{ { "Yara File", "yara" }, { "Yara File", "yar" } }, true,
[&](const auto &path) {
m_rules->push_back({ path.filename(), path });
});*/
}
ImGui::SameLine();
if (ImGuiExt::IconButton(ICON_VS_REMOVE, ImGui::GetStyleColorVec4(ImGuiCol_Text))) {
if (m_selectedRule < m_rules->size()) {
m_rules->erase(m_rules->begin() + m_selectedRule);
m_selectedRule = std::min(m_selectedRule, u32(m_rules->size() - 1));
}
}
ImGui::NewLine();
if (ImGui::Button("hex.yara_rules.view.yara.match"_lang)) this->applyRules();
ImGui::SameLine();
if (m_matcherTask.isRunning()) {
ImGui::SameLine();
ImGuiExt::TextSpinner("hex.yara_rules.view.yara.matching"_lang);
}
ImGuiExt::Header("hex.yara_rules.view.yara.header.matches"_lang);
auto matchesTableSize = ImGui::GetContentRegionAvail();
matchesTableSize.y *= 3.75 / 5.0;
matchesTableSize.y -= ImGui::GetTextLineHeightWithSpacing();
if (ImGui::BeginTable("matches", 4, ImGuiTableFlags_Borders | ImGuiTableFlags_Resizable | ImGuiTableFlags_Sortable | ImGuiTableFlags_Reorderable | ImGuiTableFlags_RowBg | ImGuiTableFlags_ScrollY, matchesTableSize)) {
ImGui::TableSetupScrollFreeze(0, 1);
ImGui::TableSetupColumn("hex.yara_rules.view.yara.matches.identifier"_lang, ImGuiTableColumnFlags_PreferSortAscending, 0, ImGui::GetID("identifier"));
ImGui::TableSetupColumn("hex.yara_rules.view.yara.matches.variable"_lang, ImGuiTableColumnFlags_PreferSortAscending, 0, ImGui::GetID("variable"));
ImGui::TableSetupColumn("hex.ui.common.address"_lang, ImGuiTableColumnFlags_PreferSortAscending, 0, ImGui::GetID("address"));
ImGui::TableSetupColumn("hex.ui.common.size"_lang, ImGuiTableColumnFlags_PreferSortAscending, 0, ImGui::GetID("size"));
ImGui::TableHeadersRow();
auto sortSpecs = ImGui::TableGetSortSpecs();
if (!m_matches->empty() && (sortSpecs->SpecsDirty || m_sortedMatches->empty())) {
m_sortedMatches->clear();
std::transform(m_matches->begin(), m_matches->end(), std::back_inserter(*m_sortedMatches), [](auto &match) {
return &match;
});
std::sort(m_sortedMatches->begin(), m_sortedMatches->end(), [&sortSpecs](const YaraMatch *left, const YaraMatch *right) -> bool {
if (sortSpecs->Specs->ColumnUserID == ImGui::GetID("identifier"))
return left->identifier < right->identifier;
else if (sortSpecs->Specs->ColumnUserID == ImGui::GetID("variable"))
return left->variable < right->variable;
else if (sortSpecs->Specs->ColumnUserID == ImGui::GetID("address"))
return left->address < right->address;
else if (sortSpecs->Specs->ColumnUserID == ImGui::GetID("size"))
return left->size < right->size;
else
return false;
});
if (sortSpecs->Specs->SortDirection == ImGuiSortDirection_Descending)
std::reverse(m_sortedMatches->begin(), m_sortedMatches->end());
sortSpecs->SpecsDirty = false;
}
if (!m_matcherTask.isRunning()) {
ImGuiListClipper clipper;
clipper.Begin(m_sortedMatches->size());
while (clipper.Step()) {
for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) {
auto &[identifier, variableName, address, size, wholeDataMatch, highlightId, tooltipId] = *(*m_sortedMatches)[i];
ImGui::TableNextRow();
ImGui::TableNextColumn();
ImGui::PushID(i);
if (ImGui::Selectable("match", false, ImGuiSelectableFlags_SpanAllColumns | ImGuiSelectableFlags_AllowOverlap)) {
ImHexApi::HexEditor::setSelection(address, size);
}
ImGui::PopID();
ImGui::SameLine();
ImGui::TextUnformatted(identifier.c_str());
ImGui::TableNextColumn();
ImGui::TextUnformatted(variableName.c_str());
if (!wholeDataMatch) {
ImGui::TableNextColumn();
ImGuiExt::TextFormatted("0x{0:X} : 0x{1:X}", address, address + size - 1);
ImGui::TableNextColumn();
ImGuiExt::TextFormatted("0x{0:X}", size);
} else {
ImGui::TableNextColumn();
ImGuiExt::TextFormattedColored(ImVec4(0.92F, 0.25F, 0.2F, 1.0F), "{}", "hex.yara_rules.view.yara.whole_data"_lang);
ImGui::TableNextColumn();
ImGui::TextUnformatted("");
}
}
}
clipper.End();
}
ImGui::EndTable();
}
auto consoleSize = ImGui::GetContentRegionAvail();
if (ImGui::BeginChild("##console", consoleSize, true, ImGuiWindowFlags_AlwaysVerticalScrollbar | ImGuiWindowFlags_HorizontalScrollbar)) {
ImGuiListClipper clipper;
clipper.Begin(m_consoleMessages.size());
while (clipper.Step()) {
for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) {
const auto &message = m_consoleMessages[i];
if (ImGui::Selectable(message.c_str()))
ImGui::SetClipboardText(message.c_str());
}
}
}
ImGui::EndChild();
}
void ViewYara::clearResult() {
for (const auto &match : *m_matches) {
ImHexApi::HexEditor::removeBackgroundHighlight(match.highlightId);
ImHexApi::HexEditor::removeTooltip(match.tooltipId);
}
m_matches->clear();
m_consoleMessages.clear();
}
void ViewYara::applyRules() {
this->clearResult();
m_matcherTask = TaskManager::createTask("hex.yara_rules.view.yara.matching", 0, [this](auto &task) {
if (!ImHexApi::Provider::isValid()) return;
struct ResultContext {
Task *task = nullptr;
std::vector<YaraMatch> newMatches;
std::vector<std::string> consoleMessages;
};
ResultContext resultContext;
resultContext.task = &task;
for (const auto &[fileName, filePath] : *m_rules) {
YR_COMPILER *compiler = nullptr;
yr_compiler_create(&compiler);
ON_SCOPE_EXIT {
yr_compiler_destroy(compiler);
};
auto currFilePath = wolv::util::toUTF8String(wolv::io::fs::toShortPath(filePath));
yr_compiler_set_include_callback(
compiler,
[](const char *includeName, const char *, const char *, void *userData) -> const char * {
wolv::io::File file(std::fs::path(static_cast<const char *>(userData)).parent_path() / includeName, wolv::io::File::Mode::Read);
if (!file.isValid())
return nullptr;
auto size = file.getSize();
char *buffer = new char[size + 1];
file.readBuffer(reinterpret_cast<u8 *>(buffer), size);
buffer[size] = 0x00;
return buffer;
},
[](const char *ptr, void *userData) {
hex::unused(userData);
delete[] ptr;
},
currFilePath.data()
);
wolv::io::File file((*m_rules)[m_selectedRule].second, wolv::io::File::Mode::Read);
if (!file.isValid()) return;
if (yr_compiler_add_file(compiler, file.getHandle(), nullptr, nullptr) != 0) {
std::string errorMessage(0xFFFF, '\x00');
yr_compiler_get_error_message(compiler, errorMessage.data(), errorMessage.size());
TaskManager::doLater([this, errorMessage = wolv::util::trim(errorMessage)] {
this->clearResult();
m_consoleMessages.push_back(hex::format("hex.yara_rules.view.yara.error"_lang, errorMessage));
});
return;
}
YR_RULES *yaraRules;
yr_compiler_get_rules(compiler, &yaraRules);
ON_SCOPE_EXIT { yr_rules_destroy(yaraRules); };
YR_MEMORY_BLOCK_ITERATOR iterator;
struct ScanContext {
Task *task = nullptr;
std::vector<u8> buffer;
YR_MEMORY_BLOCK currBlock = {};
};
ScanContext context;
context.task = &task;
context.currBlock.base = 0;
context.currBlock.fetch_data = [](auto *block) -> const u8 * {
auto &context = *static_cast<ScanContext *>(block->context);
auto provider = ImHexApi::Provider::get();
context.buffer.resize(context.currBlock.size);
if (context.buffer.empty())
return nullptr;
block->size = context.currBlock.size;
provider->read(context.currBlock.base + provider->getBaseAddress(), context.buffer.data(), context.buffer.size());
return context.buffer.data();
};
iterator.file_size = [](auto *iterator) -> u64 {
hex::unused(iterator);
return ImHexApi::Provider::get()->getActualSize();
};
iterator.context = &context;
iterator.first = [](YR_MEMORY_BLOCK_ITERATOR *iterator) -> YR_MEMORY_BLOCK *{
auto &context = *static_cast<ScanContext *>(iterator->context);
context.currBlock.base = 0;
context.currBlock.size = 0;
context.buffer.clear();
iterator->last_error = ERROR_SUCCESS;
return iterator->next(iterator);
};
iterator.next = [](YR_MEMORY_BLOCK_ITERATOR *iterator) -> YR_MEMORY_BLOCK * {
auto &context = *static_cast<ScanContext *>(iterator->context);
u64 address = context.currBlock.base + context.currBlock.size;
iterator->last_error = ERROR_SUCCESS;
context.currBlock.base = address;
context.currBlock.size = std::min<size_t>(ImHexApi::Provider::get()->getActualSize() - address, 10_MiB);
context.currBlock.context = &context;
context.task->update(address);
if (context.currBlock.size == 0) return nullptr;
return &context.currBlock;
};
yr_rules_scan_mem_blocks(
yaraRules, &iterator, 0, [](YR_SCAN_CONTEXT *context, int message, void *data, void *userData) -> int {
auto &results = *static_cast<ResultContext *>(userData);
switch (message) {
case CALLBACK_MSG_RULE_MATCHING:
{
auto rule = static_cast<YR_RULE *>(data);
if (rule->strings != nullptr) {
YR_STRING *string = nullptr;
YR_MATCH *match = nullptr;
yr_rule_strings_foreach(rule, string) {
yr_string_matches_foreach(context, string, match) {
results.newMatches.push_back({ rule->identifier, string->identifier, u64(match->offset), size_t(match->match_length), false, 0, 0 });
}
}
} else {
results.newMatches.push_back({ rule->identifier, "", 0, 0, true, 0, 0 });
}
}
break;
case CALLBACK_MSG_CONSOLE_LOG:
{
results.consoleMessages.emplace_back(static_cast<const char *>(data));
}
break;
default:
break;
}
return results.task->shouldInterrupt() ? CALLBACK_ABORT : CALLBACK_CONTINUE;
},
&resultContext,
0);
}
TaskManager::doLater([this, resultContext] {
for (const auto &match : *m_matches) {
ImHexApi::HexEditor::removeBackgroundHighlight(match.highlightId);
ImHexApi::HexEditor::removeTooltip(match.tooltipId);
}
m_consoleMessages = resultContext.consoleMessages;
std::move(resultContext.newMatches.begin(), resultContext.newMatches.end(), std::back_inserter(*m_matches));
auto uniques = std::set(m_matches->begin(), m_matches->end(), [](const auto &l, const auto &r) {
return std::tie(l.address, l.size, l.wholeDataMatch, l.identifier, l.variable) <
std::tie(r.address, r.size, r.wholeDataMatch, r.identifier, r.variable);
});
m_matches->clear();
std::move(uniques.begin(), uniques.end(), std::back_inserter(*m_matches));
constexpr static color_t YaraColor = 0x70B4771F;
for (auto &match : uniques) {
match.highlightId = ImHexApi::HexEditor::addBackgroundHighlight({ match.address, match.size }, YaraColor);
match.tooltipId = ImHexApi::HexEditor::addTooltip({ match. address, match.size }, hex::format("{0} [{1}]", match.identifier, match.variable), YaraColor);
}
});
});
}
}
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