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Always use an all-zeros key for AES-XTS file systems (#2561)
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62
Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs
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62
Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs
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using LibHac;
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using LibHac.Common;
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using LibHac.Fs;
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using LibHac.Fs.Fsa;
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using LibHac.FsSrv.FsCreator;
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using LibHac.FsSystem;
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namespace Ryujinx.HLE.FileSystem
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{
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public class EncryptedFileSystemCreator : IEncryptedFileSystemCreator
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{
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public EncryptedFileSystemCreator() { }
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public Result Create(out ReferenceCountedDisposable<IFileSystem> encryptedFileSystem, ReferenceCountedDisposable<IFileSystem> baseFileSystem,
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EncryptedFsKeyId keyId, in EncryptionSeed encryptionSeed)
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{
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UnsafeHelpers.SkipParamInit(out encryptedFileSystem);
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if (keyId < EncryptedFsKeyId.Save || keyId > EncryptedFsKeyId.CustomStorage)
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{
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return ResultFs.InvalidArgument.Log();
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}
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// Force all-zero keys for now since people can open the emulator with different keys or sd seeds sometimes
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var fs = new AesXtsFileSystem(baseFileSystem, new byte[0x32], 0x4000);
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var aesFileSystem = new ReferenceCountedDisposable<IFileSystem>(fs);
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// This wrapper will handle deleting files that were created with different keys
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var wrappedFs = new ChangedEncryptionHandlingFileSystem(aesFileSystem);
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encryptedFileSystem = new ReferenceCountedDisposable<IFileSystem>(wrappedFs);
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return Result.Success;
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}
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}
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public class ChangedEncryptionHandlingFileSystem : ForwardingFileSystem
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{
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public ChangedEncryptionHandlingFileSystem(ReferenceCountedDisposable<IFileSystem> baseFileSystem) : base(baseFileSystem) { }
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protected override Result DoOpenFile(out IFile file, U8Span path, OpenMode mode)
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{
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UnsafeHelpers.SkipParamInit(out file);
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try
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{
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return base.DoOpenFile(out file, path, mode);
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}
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catch (HorizonResultException ex)
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{
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if (ResultFs.AesXtsFileHeaderInvalidKeys.Includes(ex.ResultValue))
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{
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Result rc = DeleteFile(path);
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if (rc.IsFailure()) return rc;
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return base.DoOpenFile(out file, path, mode);
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}
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throw;
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}
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}
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}
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}
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@ -178,6 +178,9 @@ namespace Ryujinx.HLE.FileSystem
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DefaultFsServerObjects fsServerObjects = DefaultFsServerObjects.GetDefaultEmulatedCreators(serverBaseFs, KeySet, fsServer);
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// Use our own encrypted fs creator that always uses all-zero keys
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fsServerObjects.FsCreators.EncryptedFileSystemCreator = new EncryptedFileSystemCreator();
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GameCard = fsServerObjects.GameCard;
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SdCard = fsServerObjects.SdCard;
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