public void ThrowsGuardException_ForLocalsThatExceedSizeLimit()
{
// found by Stanislav Lukeš (@exyi)
var compiled = TestHelper.Compile(@"
using System;
struct A_1 { public int A; public int B; }
struct A_2 { public A_1 A; public A_1 B; }
struct A_3 { public A_2 A; public A_2 B; }
struct A_4 { public A_3 A; public A_3 B; }
struct A_5 { public A_4 A; public A_4 B; }
struct A_6 { public A_5 A; public A_5 B; }
struct A_7 { public A_6 A; public A_6 B; }
struct A_8 { public A_7 A; public A_7 B; }
struct A_9 { public A_8 A; public A_8 B; }
struct A_10 { public A_9 A; public A_9 B; }
struct A_11 { public A_10 A; public A_10 B; }
struct A_12 { public A_11 A; public A_11 B; }
struct A_13 { public A_12 A; public A_12 B; }
struct A_14 { public A_13 A; public A_13 B; }
struct A_15 { public A_14 A; public A_14 B; }
struct A_16 { public A_15 A; public A_15 B; }
struct A_17 { public A_16 A; public A_16 B; }
struct A_18 { public A_17 A; public A_17 B; }
class C {
int M() {
A_18 a;
return 0;
}
}
");
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public void ThrowsGuardException_ForAsyncMethodWithTry()
{
var compiled = TestHelper.Compile(@"
using System;
using System.Threading.Tasks;
class Program {
async Task Main() {
Console.WriteLine();
try {
await Task.Yield();
} catch { }
}
}
");
var ex = Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, Stream.Null, new AssemblyGuardSettings {
ApiPolicy = ApiPolicy.SafeDefault()
.Namespace("System.Runtime.CompilerServices", ApiAccess.Allowed)
.Namespace("System.Threading.Tasks", ApiAccess.Allowed)
})
);
Assert.Contains("System.Console", ex.Message);
}
public ExecutionResult Execute(Stream assemblyStream, Stream symbolStream, IWorkSession session)
{
AssemblyDefinition assembly;
using (assemblyStream)
using (symbolStream) {
assembly = AssemblyDefinition.ReadAssembly(assemblyStream, new ReaderParameters {
ReadSymbols = true,
SymbolStream = symbolStream,
AssemblyResolver = PreCachedAssemblyResolver.Instance
});
}
/*
#if DEBUG
* assembly.Write(@"d:\Temp\assembly\" + DateTime.Now.Ticks + "-before-rewrite.dll");
#endif
*/
foreach (var rewriter in _rewriters)
{
rewriter.Rewrite(assembly, session);
}
if (assembly.EntryPoint == null)
{
throw new ArgumentException("Failed to find an entry point (Main?) in assembly.", nameof(assemblyStream));
}
var guardToken = AssemblyGuard.Rewrite(assembly, GuardSettings);
using (var rewrittenStream = _memoryStreamManager.GetStream()) {
assembly.Write(rewrittenStream);
/*
#if DEBUG
* assembly.Write(@"d:\Temp\assembly\" + DateTime.Now.Ticks + ".dll");
#endif
*/
rewrittenStream.Seek(0, SeekOrigin.Begin);
var currentSetup = AppDomain.CurrentDomain.SetupInformation;
using (var context = AppDomainContext.Create(new AppDomainSetup {
ApplicationBase = currentSetup.ApplicationBase,
PrivateBinPath = currentSetup.PrivateBinPath
})) {
context.LoadAssembly(LoadMethod.LoadFrom, Assembly.GetExecutingAssembly().GetAssemblyFile().FullName);
var(result, exception) = RemoteFunc.Invoke(context.Domain, rewrittenStream, guardToken, Remote.Execute);
if (ShouldMonitorException(exception))
{
_monitor.Exception(exception, session);
}
return(result);
}
}
}
public void Allows_ReasonablySafePointerOperations(string code)
{
var compiled = TestHelper.Compile(@"
// required for records
namespace System.Runtime.CompilerServices { class IsExternalInit {} }
" + code + @"
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream());
}
[InlineData("void M(ref int i) => i++;")] //
public void Allows_ReasonablySafePointerOperations(string code)
{
var compiled = TestHelper.Compile(@"
class C {
" + code + @"
}
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream());
}
public void ThrowsGuardException_ForCustomTypesWithKnownTypeNames(string @namespace, string name)
{
var compiled = TestHelper.Compile(@"
namespace " + @namespace + @" { class @" + name + @" {} }
");
var exception = Record.Exception(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
Assert.IsType <AssemblyGuardException>(exception);
}
private ResultViewModel Run(string code)
{
var totalStopwatch = Stopwatch.StartNew();
var compilationStopwatch = new Stopwatch();
var rewriteStopwatch = new Stopwatch();
var executionStopwatch = new Stopwatch();
ResultViewModel resultModel(string?output) => new ResultViewModel(
output,
compilationStopwatch.Elapsed,
rewriteStopwatch.Elapsed,
executionStopwatch.Elapsed,
totalStopwatch.Elapsed
);
try {
compilationStopwatch.Start();
CSharpRoslynGuard.Validate(code);
var compilation = CSharpCompilation.Create(
"_",
new[] { CSharpSyntaxTree.ParseText(code) },
MetadataReferences,
new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
);
using (var assemblyStream = MemoryStreamManager.GetStream())
using (var rewrittenStream = MemoryStreamManager.GetStream()) {
var compilationResult = compilation.Emit(assemblyStream);
compilationStopwatch.Stop();
if (!compilationResult.Success)
{
return(resultModel(string.Join("\r\n", compilationResult.Diagnostics)));
}
assemblyStream.Seek(0, SeekOrigin.Begin);
rewriteStopwatch.Start();
var guardToken = AssemblyGuard.Rewrite(assemblyStream, rewrittenStream);
rewriteStopwatch.Stop();
var currentSetup = AppDomain.CurrentDomain.SetupInformation;
using (var context = AppDomainContext.Create(new AppDomainSetup {
ApplicationBase = currentSetup.ApplicationBase,
PrivateBinPath = currentSetup.PrivateBinPath
})) {
context.LoadAssembly(LoadMethod.LoadFrom, Assembly.GetExecutingAssembly().GetAssemblyFile().FullName);
executionStopwatch.Start();
var result = RemoteFunc.Invoke(context.Domain, rewrittenStream, guardToken, RemoteRun);
executionStopwatch.Stop();
return(resultModel(result?.ToString()));
}
}
}
catch (Exception ex) {
return(resultModel(ex.ToString()));
}
}
[InlineData("void M() { var x = new IntPtr(0); }")] // crash, found by Alexandre Mutel (@xoofx)
public void ThrowsGuardException_ForDeniedApi(string code)
{
var compiled = TestHelper.Compile(@"
using System;
class C {
" + code + @"
}"
);
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public void ThrowsGuardException_ForFinalizers()
{
// found by George Pollard (@porges)
var compiled = TestHelper.Compile(@"
class X {
~X() {}
}
");
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public void Allows_AnonymousTypes()
{
var compiled = TestHelper.Compile(@"
class C {
object M() {
return new { a = ""x"" };
}
}
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream(), AssemblyGuardSettings.DefaultForCSharpAssembly());
}
public void ThrowsGuardException_ForPInvoke()
{
// found by Igal Tabachnik (@hmemcpy)
var compiled = TestHelper.Compile(@"
using System.Runtime.InteropServices;
static class X {
[DllImport(""kernel32.dll"")]
static extern void ExitProcess(int uExitCode);
}
");
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public void ThrowsAssemblyGuardException_IfTimeoutIsProvidedManually(string code)
{
var compiled = TestHelper.Compile(@"
using System;
using System.Text.RegularExpressions;
class C {
public void M() => " + code + @";
}
");
var ex = Record.Exception(() => AssemblyGuard.Rewrite(compiled, new MemoryStream()));
Assert.IsType <AssemblyGuardException>(ex);
Assert.Contains("Timeout", ex.Message, StringComparison.OrdinalIgnoreCase);
}
[Fact] // https://github.com/ashmind/SharpLab/issues/323
public void Allows_CallsToRefReadOnlyMethods()
{
var compiled = TestHelper.Compile(@"
class C {
static ref readonly int MRef(ref int i) => ref i;
static void M() {
int x = 0;
ref readonly int r = ref MRef(ref x);
}
}
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream(), AssemblyGuardSettings.DefaultForCSharpAssembly());
}
public void ThrowsGuardException_ForDelegateBeginEndInvoke()
{
// found by Llewellyn Pritchard (@leppie)
var compiled = TestHelper.Compile(@"
using System;
class C {
delegate void D();
void M() { D d = () => {}; d.BeginInvoke(null, null); }
}"
);
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public static Invoke RewriteAndGetMethodWrappedInScope(string code, string typeName, string methodName, AssemblyGuardSettings guardSettings = null)
{
var assemblySourceStream = Compile(code);
var assemblyTargetStream = new MemoryStream();
var token = AssemblyGuard.Rewrite(assemblySourceStream, assemblyTargetStream, guardSettings);
return(args => {
using (token.Scope(new RuntimeGuardSettings {
TimeLimit = TimeSpan.FromMilliseconds(100)
})) {
var method = GetInstanceMethod(assemblyTargetStream, typeName, methodName);
return method(args);
}
});
}
public void Allows_ReasonableAmountOfNullableLocals()
{
var compiled = TestHelper.Compile(@"
class C {
void M() {
int? a = 1;
int? b = 1;
int? c = a + b;
int? d = a + b;
}
}
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream());
}
public void Allows_ExternMethods()
{
// crash, found by Alexandre Mutel (@xoofx)
var compiled = TestHelper.Compile(@"
class C {
static extern void Extern();
int M() {
Extern();
return 0;
}
}
");
// Assert.DoesNotThrow
AssemblyGuard.Rewrite(compiled, new MemoryStream());
}
public void ThrowsGuardException_ForExplicitStructLayout()
{
// found by Alexandre Mutel (@xoofx)
var compiled = TestHelper.Compile(@"
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Explicit)]
struct S {
[FieldOffset(0)]
int x;
}
");
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public void ThrowsGuardException_ForPointerTypes(string code)
{
// pointers, available in local functions due to a Roslyn bug, reported by Andy Gocke (@andygocke)
var policy = ApiPolicy.SafeDefault()
.Namespace("System.Security", ApiAccess.Neutral, n => n.Type(typeof(UnverifiableCodeAttribute), ApiAccess.Allowed));
var compiled = TestHelper.Compile(@"
class X {
unsafe void M(int a) { " + code + @" }
}
", allowUnsafe: true);
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream(), new AssemblyGuardSettings {
ApiPolicy = policy
})
);
}
public void ThrowsGuardException_ForDelegatesCreatedFromMethodsWithRewriters(string code)
{
var compiled = TestHelper.Compile(@"
using System;
using System.Linq.Expressions;
class C {
void M() { " + code + @" }
}"
);
var policy = ApiPolicy.SafeDefault()
.Namespace("System.Linq.Expressions", ApiAccess.Allowed)
.Namespace("System.Reflection", ApiAccess.Allowed);
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream(), new AssemblyGuardSettings {
ApiPolicy = policy
})
);
}
public ExecutionResult Execute(CompilationStreamPair streams, IWorkSession session)
{
var readerParameters = new ReaderParameters {
ReadSymbols = streams.SymbolStream != null,
SymbolStream = streams.SymbolStream,
AssemblyResolver = _assemblyResolver,
SymbolReaderProvider = streams.SymbolStream != null ? _symbolReaderProvider : null
};
using (streams)
using (var definition = AssemblyDefinition.ReadAssembly(streams.AssemblyStream, readerParameters)) {
foreach (var rewriter in _rewriters)
{
rewriter.Rewrite(definition, session);
}
PerformanceLog.Checkpoint("Executor.Rewrite.Flow.End");
AssemblyLog.Log("2.WithFlow", definition);
if (definition.EntryPoint == null)
{
Output.Reset();
Flow.Reset();
Output.WriteWarning("Could not find any code to run (either a Main method or any top level code).");
return(new ExecutionResult(Output.Stream, Flow.Steps));
}
var guardToken = AssemblyGuard.Rewrite(definition, _guardSettings);
using (var rewrittenStream = _memoryStreamManager.GetStream()) {
definition.Write(rewrittenStream);
AssemblyLog.Log("3.Unbreakable", definition);
rewrittenStream.Seek(0, SeekOrigin.Begin);
PerformanceLog.Checkpoint("Executor.Rewrite.Unbreakable.End");
using (var context = new CustomAssemblyLoadContext(shouldShareAssembly: ShouldShareAssembly)) {
var assembly = context.LoadFromStream(rewrittenStream);
PerformanceLog.Checkpoint("Executor.AssemblyLoad.End");
return(Execute(assembly, guardToken, session));
}
}
}
}
public ExecutionResult Execute(CompilationStreamPair streams, IWorkSession session)
{
var readerParameters = new ReaderParameters {
ReadSymbols = streams.SymbolStream != null,
SymbolStream = streams.SymbolStream,
AssemblyResolver = _assemblyResolver,
SymbolReaderProvider = streams.SymbolStream != null ? _symbolReaderProvider : null
};
using (streams)
using (var definition = AssemblyDefinition.ReadAssembly(streams.AssemblyStream, readerParameters)) {
AssemblyLog.Log("1.Initial", definition);
foreach (var rewriter in _rewriters)
{
rewriter.Rewrite(definition, session);
}
PerformanceLog.Checkpoint("Executor.Rewrite.Flow.End");
AssemblyLog.Log("2.WithFlow", definition);
if (definition.EntryPoint == null)
{
throw new ArgumentException("Failed to find an entry point (Main?) in assembly.", nameof(streams));
}
var guardToken = AssemblyGuard.Rewrite(definition, _guardSettings);
using (var rewrittenStream = _memoryStreamManager.GetStream()) {
definition.Write(rewrittenStream);
AssemblyLog.Log("3.Unbreakable", definition);
rewrittenStream.Seek(0, SeekOrigin.Begin);
PerformanceLog.Checkpoint("Executor.Rewrite.Unbreakable.End");
using (var context = new CustomAssemblyLoadContext(shouldShareAssembly: ShouldShareAssembly)) {
var assembly = context.LoadFromStream(rewrittenStream);
PerformanceLog.Checkpoint("Executor.AssemblyLoad.End");
return(Execute(assembly, guardToken, session));
}
}
}
}
public void DoesNotEnforceApiPolicy_ForUserCode()
{
var compiled = TestHelper.Compile(@"
namespace N {
class C1 {
void M(C2 c2) { c2.M(); }
}
class C2 {
public void M() {}
}
}
");
var exception = Record.Exception(() => AssemblyGuard.Rewrite(compiled, new MemoryStream(), new AssemblyGuardSettings {
ApiPolicy = ApiPolicy.SafeDefault().Namespace("N", ApiAccess.Denied)
}));
Assert.Null(exception);
}
public void ThrowsGuardException_ForFieldReadsThatExceedSizeLimit()
{
// found by Tereza Tomcova (@the-ress)
var compiled = TestHelper.Compile(@"
using System;
using System.Collections.Generic;
struct A_1 { public int A; public int B; }
struct A_2 { public A_1 A; public A_1 B; }
struct A_3 { public A_2 A; public A_2 B; }
struct A_4 { public A_3 A; public A_3 B; }
struct A_5 { public A_4 A; public A_4 B; }
struct A_6 { public A_5 A; public A_5 B; }
struct A_7 { public A_6 A; public A_6 B; }
struct A_8 { public A_7 A; public A_7 B; }
struct A_9 { public A_8 A; public A_8 B; }
struct A_10 { public A_9 A; public A_9 B; }
struct A_11 { public A_10 A; public A_10 B; }
struct A_12 { public A_11 A; public A_11 B; }
struct A_13 { public A_12 A; public A_12 B; }
struct A_14 { public A_13 A; public A_13 B; }
struct A_15 { public A_14 A; public A_14 B; }
struct A_16 { public A_15 A; public A_15 B; }
struct A_17 { public A_16 A; public A_16 B; }
struct A_18 { public A_17 A; public A_17 B; }
class C {
static readonly A_18 Value = default(A_18);
int M() {
var d = new Dictionary<int, A_18>();
d.Add(0, Value);
return 0;
}
}
");
Assert.Throws <AssemblyGuardException>(
() => AssemblyGuard.Rewrite(compiled, new MemoryStream())
);
}
public ExecutionResult Execute(Stream assemblyStream, Stream symbolStream, IWorkSession session)
{
var readerParameters = new ReaderParameters {
ReadSymbols = symbolStream != null,
SymbolStream = symbolStream,
AssemblyResolver = _assemblyResolver,
SymbolReaderProvider = symbolStream != null ? _symbolReaderProvider : null
};
using (assemblyStream)
using (symbolStream)
using (var assembly = AssemblyDefinition.ReadAssembly(assemblyStream, readerParameters)) {
/*
#if DEBUG
* assembly.Write(@"d:\Temp\assembly\" + DateTime.Now.Ticks + "-before-rewrite.dll");
#endif
*/
foreach (var rewriter in _rewriters)
{
rewriter.Rewrite(assembly, session);
}
if (assembly.EntryPoint == null)
{
throw new ArgumentException("Failed to find an entry point (Main?) in assembly.", nameof(assemblyStream));
}
var guardToken = AssemblyGuard.Rewrite(assembly, GuardSettings);
using (var rewrittenStream = _memoryStreamManager.GetStream()) {
assembly.Write(rewrittenStream);
/*
#if DEBUG
* assembly.Write(@"d:\Temp\assembly\" + DateTime.Now.Ticks + ".dll");
#endif
*/
rewrittenStream.Seek(0, SeekOrigin.Begin);
return(ExecuteInAppDomain(rewrittenStream, guardToken, session));
}
}
}
private static Assembly RewriteNewtonsoftJson()
{
var assemblyPath = typeof(JsonSerializer).Assembly.GetAssemblyFileFromCodeBase().FullName;
var definition = AssemblyDefinition.ReadAssembly(assemblyPath);
definition.Name.HasPublicKey = false;
definition.Name.PublicKey = new byte[0];
definition.Name.HashAlgorithm = AssemblyHashAlgorithm.None;
definition.MainModule.Attributes &= ~ModuleAttributes.StrongNameSigned;
AssemblyGuard.Rewrite(definition, new AssemblyGuardSettings {
ApiPolicy = ApiRules,
MethodLocalsSizeLimit = IntPtr.Size * 40,
MethodStackPushSizeLimit = 120,
AllowExplicitLayoutInTypesMatchingPattern = new Regex("<PrivateImplementationDetails>")
});
var assemblyStream = new MemoryStream();
definition.Write(assemblyStream);
definition.Write(Path.Combine(Path.GetDirectoryName(assemblyPath) !, "Newtonsoft.Json.Rewritten.dll"));
return(Assembly.Load(assemblyStream.ToArray()));
}
public ExecutionResult Execute(CompilationStreamPair streams, IWorkSession session)
{
var readerParameters = new ReaderParameters {
ReadSymbols = streams.SymbolStream != null,
SymbolStream = streams.SymbolStream,
AssemblyResolver = _assemblyResolver,
SymbolReaderProvider = streams.SymbolStream != null ? _symbolReaderProvider : null
};
using (streams)
using (var definition = AssemblyDefinition.ReadAssembly(streams.AssemblyStream, readerParameters)) {
AssemblyLog.Log("1.Initial", definition);
foreach (var rewriter in _rewriters)
{
rewriter.Rewrite(definition, session);
}
AssemblyLog.Log("2.WithFlow", definition);
if (definition.EntryPoint == null)
{
throw new ArgumentException("Failed to find an entry point (Main?) in assembly.", nameof(streams));
}
var guardToken = AssemblyGuard.Rewrite(definition, _guardSettings);
using (var rewrittenStream = _memoryStreamManager.GetStream()) {
definition.Write(rewrittenStream);
AssemblyLog.Log("3.Unbreakable", definition);
rewrittenStream.Seek(0, SeekOrigin.Begin);
var(result, exception) = ExecuteWithIsolation(rewrittenStream, guardToken, session);
if (ShouldMonitorException(exception))
{
_monitor.Exception(exception !, session);
}
return(result);
}
}
}
public static RuntimeGuardToken Rewrite(Stream source, Stream target)
{
return(AssemblyGuard.Rewrite(source, target, CreateGuardSettings()));
}