From cd4530f29c6a4ffd1b023105350b0440fa63f47b Mon Sep 17 00:00:00 2001
From: Alex Barney <thealexbarney@gmail.com>
Date: Tue, 17 Aug 2021 10:46:52 -0700
Subject: Always use an all-zeros key for AES-XTS file systems (#2561)
---
.../FileSystem/EncryptedFileSystemCreator.cs | 62 ++++++++++++++++++++++
1 file changed, 62 insertions(+)
create mode 100644 Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs
(limited to 'Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs')
diff --git a/Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs b/Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs
new file mode 100644
index 00000000..aaa80044
--- /dev/null
+++ b/Ryujinx.HLE/FileSystem/EncryptedFileSystemCreator.cs
@@ -0,0 +1,62 @@
+using LibHac;
+using LibHac.Common;
+using LibHac.Fs;
+using LibHac.Fs.Fsa;
+using LibHac.FsSrv.FsCreator;
+using LibHac.FsSystem;
+
+namespace Ryujinx.HLE.FileSystem
+{
+ public class EncryptedFileSystemCreator : IEncryptedFileSystemCreator
+ {
+ public EncryptedFileSystemCreator() { }
+
+ public Result Create(out ReferenceCountedDisposable<IFileSystem> encryptedFileSystem, ReferenceCountedDisposable<IFileSystem> baseFileSystem,
+ EncryptedFsKeyId keyId, in EncryptionSeed encryptionSeed)
+ {
+ UnsafeHelpers.SkipParamInit(out encryptedFileSystem);
+
+ if (keyId < EncryptedFsKeyId.Save || keyId > EncryptedFsKeyId.CustomStorage)
+ {
+ return ResultFs.InvalidArgument.Log();
+ }
+
+ // Force all-zero keys for now since people can open the emulator with different keys or sd seeds sometimes
+ var fs = new AesXtsFileSystem(baseFileSystem, new byte[0x32], 0x4000);
+ var aesFileSystem = new ReferenceCountedDisposable<IFileSystem>(fs);
+
+ // This wrapper will handle deleting files that were created with different keys
+ var wrappedFs = new ChangedEncryptionHandlingFileSystem(aesFileSystem);
+ encryptedFileSystem = new ReferenceCountedDisposable<IFileSystem>(wrappedFs);
+
+ return Result.Success;
+ }
+ }
+
+ public class ChangedEncryptionHandlingFileSystem : ForwardingFileSystem
+ {
+ public ChangedEncryptionHandlingFileSystem(ReferenceCountedDisposable<IFileSystem> baseFileSystem) : base(baseFileSystem) { }
+
+ protected override Result DoOpenFile(out IFile file, U8Span path, OpenMode mode)
+ {
+ UnsafeHelpers.SkipParamInit(out file);
+
+ try
+ {
+ return base.DoOpenFile(out file, path, mode);
+ }
+ catch (HorizonResultException ex)
+ {
+ if (ResultFs.AesXtsFileHeaderInvalidKeys.Includes(ex.ResultValue))
+ {
+ Result rc = DeleteFile(path);
+ if (rc.IsFailure()) return rc;
+
+ return base.DoOpenFile(out file, path, mode);
+ }
+
+ throw;
+ }
+ }
+ }
+}
--
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