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FindCrypt.java
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/*
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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free software which everyone can redistribute and change under these terms.
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Copyright (C) <year> <name of author>
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This program is distributed in the hope that it will be useful,
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
*/
// Quickly find references to cryptographic functions and constants.
// This is a port of IDA Pro's FindCrypt plugin, with an updated and customizable signature database.
//@category Analysis
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.zip.GZIPInputStream;
import docking.widgets.dialogs.MultiLineMessageDialog;
import ghidra.app.script.GhidraScript;
import ghidra.app.services.ConsoleService;
import ghidra.app.tablechooser.*;
import ghidra.app.util.datatype.DataTypeSelectionDialog;
import ghidra.framework.plugintool.PluginTool;
import ghidra.program.model.address.*;
import ghidra.program.model.data.ArrayDataType;
import ghidra.program.model.data.DataType;
import ghidra.program.model.data.Undefined;
import ghidra.program.model.data.Undefined4DataType;
import ghidra.program.model.listing.Data;
import ghidra.program.model.listing.DataIterator;
import ghidra.program.model.listing.Function;
import ghidra.util.Msg;
import ghidra.util.data.DataTypeParser.AllowedDataTypes;
import ghidra.util.task.CancelOnlyWrappingTaskMonitor;
public class FindCrypt extends GhidraScript {
private static final int CRYPT_COUNTER = 20;
private static final double DETECT_THRESHOLD = 0.8;
private static final int SKIP_SMALLER_SUB_CONSTANTS = 4;
public static class InternalParams {
// Disable automatic database update.
public static final boolean __FORCE_NO_DBUPDATE = false;
// Disable automatic script version check.
public static final boolean __FORCE_NO_SCRIPTUPDATE = false;
// Current script version, used for enforcing; modifications not recommended unless you know what you're doing.
public static final String __SCRIPT_VERSION = "7";
}
public static class GuiHandler {
public static void ShowMessage(String _title, String _message, String _details, int _icon) {
MultiLineMessageDialog.showMessageDialog(null, _title, _message, _details, _icon);
}
}
public static class UpdateManager {
private String _BASE = "";
private String _LOCAL = "";
public String GetChangelog() {
URL url;
try {
url = new URL(this._BASE + "/last_chlog.txt");
URLConnection urlConnection = url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
var _lastchLog = new String(in.readAllBytes(), "UTF-8");
return _lastchLog;
} catch (Exception e) {
return "Error recovering last changelog:\n" + e.getMessage();
}
}
public boolean CheckScriptVersion() {
URL url;
try {
url = new URL(this._BASE + "/script_update.txt");
URLConnection urlConnection = url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
var _last = Integer.parseInt(new String(in.readAllBytes(), "UTF-8"));
var _local = Integer.parseInt(InternalParams.__SCRIPT_VERSION);
if (_last > _local) {
MultiLineMessageDialog.showMessageDialog(null, "FindCrypt Ghidra",
"A new version of FindCrypt-Ghidra is available:", this.GetChangelog() + "\n\n\thttps://github.com/d3v1l401/FindCrypt-Ghidra", 1);
}
return true;
} catch (Exception e) {
// Don't bother, internet may not be available.
}
return false;
}
public boolean CheckDatabaseVersion() {
URL url;
try {
url = new URL(this._BASE + "/last_update.txt");
URLConnection urlConnection = url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
var _last = Integer.parseInt(new String(in.readAllBytes(), "UTF-8"));
var _local = Integer.parseInt(Files.readString(Paths.get(this._LOCAL + "last_update.txt")));
if (_last > _local) {
System.out.println("A new version of the database is being downloaded (" + _local + " -> " + _last + ").");
url = new URL(this._BASE + "/database.d3v");
ReadableByteChannel readableByteChannel = Channels.newChannel(url.openStream());
new File(this._LOCAL + "database.d3v").delete();
FileOutputStream fileOutputStream = new FileOutputStream(this._LOCAL + "database.d3v");
fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
fileOutputStream.close();
new File(this._LOCAL + "last_update.txt").delete();
var _handle = new FileWriter(this._LOCAL + "last_update.txt");
_handle.write(String.valueOf(_last));
_handle.close();
}
return true;
} catch (Exception e) {
// Don't bother, internet may not be available.
}
return false;
}
public UpdateManager(String _baseUrl, String _basePath) {
this._BASE = _baseUrl;
this._LOCAL = _basePath;
}
}
public static class DatabaseManager {
// Structure of database file, for reference.
/*******************************************************************
| MAGIC (4) | Total Entries (2) |
| NameSize (4) | Name (x) | isCompressed(1) | ESize(4) | BSize(4) |
| Buffer (x) | ... |
******************************************************************/
// Structure of the database entry.
public class EntryInfo {
private byte[] _buffer;
private String _name;
private int _elementSize;
public EntryInfo(byte[] _buff, int _elementSize, String _name) {
this._buffer = _buff;
this._elementSize = _elementSize;
this._name = _name;
}
}
private boolean _loaded = false;
private static final int _EXPECTED_MAGIC = 0xD3010401;
private short _totalEntries = 0;
private ArrayList<EntryInfo> _consts = new ArrayList<>();
public int DbSize() {
return this._totalEntries;
}
public DatabaseManager(String _path) {
if (!this._loaded) {
try (DataInputStream _stream = new DataInputStream(new FileInputStream(_path))) {
var _curMagic = _stream.readInt();
if (_curMagic != _EXPECTED_MAGIC)
throw new Exception("Specified database file has a different magic from the expected one.");
this._totalEntries = _stream.readShort();
if (this._totalEntries == 0) {
GuiHandler.ShowMessage("FindCrypt - Warning", "Something unusual happened while loading the database.",
"The database contains no entries, while this is not error, the script will not scan anything", 2);
return; // No need to proceed at all.
}
for (var i = 0; i < this._totalEntries; i++) {
var _nameSize = _stream.readInt();
if (_nameSize == 0)
throw new Exception("An entry has 0 length name.");
var _name = new byte[_nameSize];
_stream.read(_name);
var _isCompressed = _stream.readByte();
var _elementSize = _stream.readInt();
var _buffSize = _stream.readInt();
if (_buffSize == 0)
throw new Exception("An entry has no buffer (" + _name + ")");
var _buff = new byte[_buffSize];
_stream.read(_buff);
if (_isCompressed == 0x01) {
// https://stackoverflow.com/questions/12531579/uncompress-a-gzip-string-in-java
ByteArrayInputStream bytein = new ByteArrayInputStream(_buff);
GZIPInputStream gzin = new GZIPInputStream(bytein);
ByteArrayOutputStream byteout = new ByteArrayOutputStream();
int res = 0;
byte buf[] = new byte[1024];
while (res >= 0) {
res = gzin.read(buf, 0, buf.length);
if (res > 0) {
byteout.write(buf, 0, res);
}
}
byte uncompressed[] = byteout.toByteArray();
this._consts.add(new EntryInfo(uncompressed, _elementSize, new String(_name, "UTF-8")));
} else
this._consts.add(new EntryInfo(_buff, _elementSize, new String(_name, "UTF-8")));
}
_stream.close();
this._loaded = true;
} catch (Exception e) {
GuiHandler.ShowMessage("FindCrypt - Error" , "An error happened while loading the database.", e.getMessage(), 0);
}
}
}
}
public static class WorksetManager {
private static final String __FCUPD_BASEURL = "https://raw.githubusercontent.com/d3v1l401/FindCrypt-Ghidra/master/findcrypt_ghidra";
private static final String __FCDATA_DIR = System.getProperty("user.home") + File.separator + "findcrypt_ghidra" + File.separator;
private static DatabaseManager _dbHandler;
private static UpdateManager _updHandler;
public static boolean Initialize() {
_dbHandler = new DatabaseManager(__FCDATA_DIR + "database.d3v");
_updHandler = new UpdateManager(__FCUPD_BASEURL, __FCDATA_DIR);
if (_dbHandler != null && _updHandler != null) {
_updHandler.CheckDatabaseVersion();
_updHandler.CheckScriptVersion();
return true;
}
return false;
}
public static int GetDatabaseSize() {
return _dbHandler.DbSize();
}
public static ArrayList<DatabaseManager.EntryInfo> GetDB() {
return _dbHandler._consts;
}
}
public class FoundCryptoEntry {
private DatabaseManager.EntryInfo _dbentry;
private AddressSet _addresses;
private Function _function;
private double _detectionRate;
public FoundCryptoEntry(DatabaseManager.EntryInfo _dbentry, AddressSet _addresses, Double _detectionRate) {
this._dbentry = _dbentry;
this._addresses = _addresses;
this._function = getFunctionContaining(_addresses.getMinAddress());
this._detectionRate = _detectionRate;
}
public String toString() {
if (_function != null)
return String.format("%s (%s) -> %s\n", _function.getName(), _dbentry._name, _addresses.getMinAddress().toString());
return String.format("%s -> %s\n", _dbentry._name, _addresses.getMinAddress().toString());
}
public Boolean isFullMatch() {
return _detectionRate == 1.0;
}
}
public class FoundCryptoEntries extends ArrayList<FoundCryptoEntry> {
}
private TableChooserExecutor createTableExecutor() {
TableChooserExecutor executor = new TableChooserExecutor() {
@Override
public String getButtonName() {
return "Create Data";
}
@Override
public boolean execute(AddressableRowObject rowObject) {
ResultRow row = (ResultRow)rowObject;
boolean commit = true;
var transaction = currentProgram.startTransaction(getScriptName() + ": Create data");
if(row.entry.isFullMatch()) {
try {
createDataInRange(row.entry._addresses.getFirstRange(), row.entry._dbentry);
}
catch (Exception e) {
println("Creating Data Failed: " + e.getClass().getSimpleName() + ": " + e.getMessage());
ConsoleService console = state.getTool().getService(ConsoleService.class);
e.printStackTrace(console.getStdOut());
commit = false;
}
}
currentProgram.endTransaction(transaction, commit);
return true;
}
private Data createDataInRange(AddressRange range, DatabaseManager.EntryInfo alg) throws Exception {
ArrayList<Data> dataToDestroy = new ArrayList<>();