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unity wasm crack

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sirjonasxx 2020-12-27 21:30:47 +01:00
parent 1d81e9b02d
commit 9a5415a199
2 changed files with 238 additions and 1 deletions
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14
G-Earth/pom.xml
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@ -12,7 +12,7 @@
<properties>
<javafx.version>1.8</javafx.version>
<jettyVersion>9.2.14.v20151106</jettyVersion>
<jettyVersion>9.4.35.v20201120</jettyVersion>
</properties>
<parent>
@ -190,8 +190,20 @@
<artifactId>javax-websocket-server-impl</artifactId>
<version>${jettyVersion}</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-http</artifactId>
<version>${jettyVersion}</version>
</dependency>
<dependency>
<groupId>G-Earth</groupId>
<artifactId>G-Wasm</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<repositories>

225
G-Earth/src/main/java/gearth/services/unity_tools/WasmCodePatcher.java Normal file
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@ -0,0 +1,225 @@
package gearth.services.unity_tools;
import wasm.disassembly.InvalidOpCodeException;
import wasm.disassembly.instructions.Expression;
import wasm.disassembly.instructions.Instr;
import wasm.disassembly.instructions.InstrType;
import wasm.disassembly.instructions.control.CallInstr;
import wasm.disassembly.instructions.variable.LocalVariableInstr;
import wasm.disassembly.modules.Module;
import wasm.disassembly.modules.indices.FuncIdx;
import wasm.disassembly.modules.indices.LocalIdx;
import wasm.disassembly.modules.indices.TypeIdx;
import wasm.disassembly.modules.sections.code.Func;
import wasm.disassembly.modules.sections.export.Export;
import wasm.disassembly.modules.sections.export.ExportDesc;
import wasm.disassembly.modules.sections.imprt.Import;
import wasm.disassembly.modules.sections.imprt.ImportDesc;
import wasm.disassembly.types.FuncType;
import wasm.disassembly.types.ResultType;
import wasm.disassembly.types.ValType;
import wasm.misc.Function;
import java.io.*;
import java.util.*;
public class WasmCodePatcher {
private final Module module;
private String file;
public WasmCodePatcher(String file) throws IOException, InvalidOpCodeException {
module = new Module(file);
this.file = file;
}
public void patch() throws IOException, InvalidOpCodeException {
FuncIdx returnByteId = findReturnByteFunc();
FuncIdx setkey = findSetKeyFunc();
FuncIdx outgoingIdx = findOutFunc();
FuncIdx incomingIdx = findInFunc();
hook(setkey, "g_chacha_setkey");
copyEmptyHook(returnByteId, "_gearth_returnbyte_copy", "g_chacha_returnbyte");
copyEmptyHook(outgoingIdx, "_gearth_outgoing_copy", "g_outgoing_packet");
copyEmptyHook(incomingIdx, "_gearth_incoming_copy", "g_incoming_packet");
module.assembleToFile(file);
}
private FuncIdx findOutFunc() {
TypeIdx expectedTypeIdx = module.getTypeSection().getTypeIdxForFuncType(new FuncType(
new ResultType(Arrays.asList(ValType.I32, ValType.I32, ValType.I32)),
new ResultType(Collections.emptyList())
));
outerloop:
for (int i = 0; i < module.getCodeSection().getCodesEntries().size(); i++) {
FuncIdx currentIdx = new FuncIdx(i + module.getImportSection().getTotalFuncImports(), module);
Func func = module.getCodeSection().getByIdx(currentIdx);
if (func.getLocalss().size() != 0) continue;
if (!module.getFunctionSection().getByIdx(currentIdx).equals(expectedTypeIdx)) continue;
List<Instr> expression = func.getExpression().getInstructions();
if (expression.size() != 6) continue;
if (expression.get(0).getInstrType() != InstrType.LOCAL_GET) continue;
if (expression.get(1).getInstrType() != InstrType.LOCAL_GET) continue;
if (expression.get(2).getInstrType() != InstrType.LOCAL_GET) continue;
if (expression.get(3).getInstrType() != InstrType.I32_LOAD) continue;
if (expression.get(4).getInstrType() != InstrType.I32_CONST) continue;
if (expression.get(5).getInstrType() != InstrType.CALL) continue;
return currentIdx;
}
return null;
}
private FuncIdx findSetKeyFunc() {
FuncType expectedType = new FuncType(
new ResultType(Arrays.asList(ValType.I32, ValType.I32, ValType.I32, ValType.I32)),
new ResultType(Collections.emptyList())
);
List<InstrType> expectedExpr = Arrays.asList(InstrType.I32_CONST, InstrType.I32_LOAD8_S,
InstrType.I32_EQZ, InstrType.IF, InstrType.BLOCK, InstrType.LOCAL_GET, InstrType.I32_CONST,
InstrType.LOCAL_GET, InstrType.I32_LOAD, InstrType.I32_CONST, InstrType.I32_CONST, InstrType.I32_CONST,
InstrType.CALL);
outerloop:
for (int i = 0; i < module.getCodeSection().getCodesEntries().size(); i++) {
FuncIdx funcIdx = new FuncIdx(i + module.getImportSection().getTotalFuncImports(), module);
Function function = new Function(module, funcIdx);
if (!function.getFuncType().equals(expectedType)) continue;
if (!(function.getLocalsFloored().size() == 1 && function.getLocalsFloored().get(0) == ValType.I32)) continue;
if (function.getCode().getInstructions().size() != expectedExpr.size()) continue;
for (int j = 0; j < function.getCode().getInstructions().size(); j++) {
Instr instr = function.getCode().getInstructions().get(j);
if (instr.getInstrType() != expectedExpr.get(j)) continue outerloop;
}
return funcIdx;
}
return null;
}
private FuncIdx findReturnByteFunc() {
FuncType expectedType = new FuncType(
new ResultType(Arrays.asList(ValType.I32, ValType.I32, ValType.I32)),
new ResultType(Collections.singletonList(ValType.I32))
);
outerloop:
for (int i = 0; i < module.getCodeSection().getCodesEntries().size(); i++) {
FuncIdx funcIdx = new FuncIdx(i + module.getImportSection().getTotalFuncImports(), module);
Function function = new Function(module, funcIdx);
if (!function.getFuncType().equals(expectedType)) continue;
if (function.getLocalsFloored().size() != 0) continue;
if (function.getCode().getInstructions().size() != 30) continue;
List<Instr> expr = function.getCode().getInstructions();
if (expr.get(expr.size() - 1).getInstrType() != InstrType.I32_XOR) continue;
return funcIdx;
}
return null;
}
private FuncIdx findInFunc() {
FuncType expectedType = new FuncType(
new ResultType(Arrays.asList(ValType.I32, ValType.I32, ValType.I32, ValType.I32, ValType.I32)),
new ResultType(Collections.emptyList())
);
List<InstrType> expectedExpr = Arrays.asList(InstrType.I32_CONST, InstrType.I32_LOAD8_S,
InstrType.I32_EQZ, InstrType.IF, InstrType.LOCAL_GET, InstrType.I32_LOAD, InstrType.LOCAL_TEE,
InstrType.IF);
outerloop:
for (int i = 0; i < module.getCodeSection().getCodesEntries().size(); i++) {
FuncIdx funcIdx = new FuncIdx(i + module.getImportSection().getTotalFuncImports(), module);
Function function = new Function(module, funcIdx);
if (!function.getFuncType().equals(expectedType)) continue;
if (!(function.getLocalsFloored().size() == 1 && function.getLocalsFloored().get(0) == ValType.I32)) continue;
if (function.getCode().getInstructions().size() != expectedExpr.size()) continue;
for (int j = 0; j < function.getCode().getInstructions().size(); j++) {
Instr instr = function.getCode().getInstructions().get(j);
if (instr.getInstrType() != expectedExpr.get(j)) continue outerloop;
}
return funcIdx;
}
return null;
}
private void copyEmptyHook(FuncIdx orgFuncIdx, String exportName, String hookname) throws InvalidOpCodeException, IOException {
// copies the method, empties the first one
// export the copy
// hooks to the emptied one
Func func = module.getCodeSection().getByIdx(orgFuncIdx);
FuncType funcType = module.getTypeSection().getByFuncIdx(orgFuncIdx);
// copy the function
Function copy = new Function(funcType, func.getLocalss(), func.getExpression());
FuncIdx copyIdx = copy.addToModule(module);
module.getExportSection().getExports().add(new Export(exportName, new ExportDesc(copyIdx)));
// clear & hook original function, let it return whatever JS returns
Import imp = new Import(
"env",
hookname,
new ImportDesc(module.getTypeSection().getTypeIdxForFuncType(new FuncType(
funcType.getParameterType(),
funcType.getResultType()
)))
);
FuncIdx hookIdx = module.getImportSection().importFunction(imp);
CallInstr call = new CallInstr(hookIdx);
List<Instr> newInstrs = new ArrayList<>();
for (int i = 0; i < funcType.getParameterType().typeList().size(); i++) {
newInstrs.add(new LocalVariableInstr(InstrType.LOCAL_GET, new LocalIdx(i)));
}
newInstrs.add(call);
func.setExpression(new Expression(newInstrs));
}
private void hook(FuncIdx funcIdx, String jsFunctionName) throws InvalidOpCodeException, IOException {
FuncType funcType = module.getTypeSection().getByFuncIdx(funcIdx);
Import imp = new Import(
"env",
jsFunctionName,
new ImportDesc(module.getTypeSection().getTypeIdxForFuncType(new FuncType(
funcType.getParameterType(),
new ResultType(Collections.emptyList())
)))
);
FuncIdx hookIdx = module.getImportSection().importFunction(imp);
CallInstr call = new CallInstr(hookIdx);
Func root = module.getCodeSection().getByIdx(funcIdx);
List<Instr> newInstrs = new ArrayList<>();
for (int i = 0; i < funcType.getParameterType().typeList().size(); i++) {
newInstrs.add(new LocalVariableInstr(InstrType.LOCAL_GET, new LocalIdx(i)));
}
newInstrs.add(call);
newInstrs.addAll(root.getExpression().getInstructions());
root.getExpression().setInstructions(newInstrs);
}
}