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111 lines
3.8 KiB
111 lines
3.8 KiB
#nullable enable
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using IPA.Logging;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace IPA.AntiMalware
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{
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internal class WindowsWin32AntiMalware : IAntiMalware, IDisposable
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{
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internal static WindowsWin32AntiMalware? TryInitialize()
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{
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try
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{
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return new();
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}
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catch (Exception e)
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{
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Logger.AntiMalware.Warn("Could not initialize Win32-based antimalware engine:");
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Logger.AntiMalware.Warn(e);
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return null;
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}
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}
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private readonly IntPtr handle;
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private bool disposedValue;
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private WindowsWin32AntiMalware()
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{
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AmsiInitialize(AmsiConstants.AppName, out handle);
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}
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private static ScanResult ScanResultFromAmsiResult(AmsiResult result)
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=> result switch
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{
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AmsiResult.Clean => ScanResult.KnownSafe,
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AmsiResult.NotDetected => ScanResult.NotDetected,
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AmsiResult.Detected => ScanResult.Detected,
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_ => ScanResult.MaybeMalware
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};
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public ScanResult ScanFile(FileInfo file)
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{
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var data = File.ReadAllBytes(file.FullName);
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return ScanData(data, file.FullName);
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}
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public ScanResult ScanData(byte[] data, string? contentName = null)
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{
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contentName ??= $"unknown_data_{Guid.NewGuid()}";
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AmsiScanBuffer(handle, data, (uint)data.Length, contentName, IntPtr.Zero, out var result);
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Logger.AntiMalware.Trace($"Scanned data named '{contentName}' and got '{result}'");
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return ScanResultFromAmsiResult(result);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (!disposedValue)
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{
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if (disposing)
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{
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// we have no disposable managed state
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}
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AmsiUninitialize(handle);
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disposedValue = true;
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}
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}
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~WindowsWin32AntiMalware()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: false);
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}
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public void Dispose()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: true);
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GC.SuppressFinalize(this);
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}
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[DllImport("amsi", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, ExactSpelling = true)]
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#if !NET35
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[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
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#endif
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private static extern void AmsiInitialize([MarshalAs(UnmanagedType.LPWStr)] string appName, [Out] out IntPtr handle);
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[DllImport("amsi", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, ExactSpelling = true)]
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#if !NET35
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[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
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#endif
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private static extern void AmsiUninitialize(IntPtr handle);
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[DllImport("amsi", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, ExactSpelling = true)]
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#if !NET35
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[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
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#endif
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private static extern void AmsiScanBuffer(IntPtr context,
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[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] buffer, uint length,
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[MarshalAs(UnmanagedType.LPWStr)] string contentName,
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IntPtr session,
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[Out] out AmsiResult result);
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}
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}
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