// Helper methods
protected void LoadOuterManifest()
{
if (InnerProxy.Manifest.RootDirectory.Files.ContainsKey(
DefaultOuterManifestFileName) == false)
{
throw new Exception("Encrypted manifest is not present.");
}
ManifestFileInfo outerManifestManifestFileInfo =
InnerProxy.Manifest.RootDirectory.Files[
DefaultOuterManifestFileName];
FileInfo outerManifestFileInfo =
InnerProxy.GetFile(outerManifestManifestFileInfo);
Stream outerManifestFileStream =
outerManifestFileInfo.OpenRead();
byte[] outerKeyBytes = CryptUtilities.MakeKeyBytesFromString(
OuterKeyString,
InnerProxy.Manifest.Guid.ToByteArray());
Stream outerManifestCryptoStream =
CryptUtilities.MakeDecryptionReadStreamFrom(
outerManifestFileStream,
outerKeyBytes);
OuterManifest =
Manifest.ReadManifestStream(outerManifestCryptoStream);
outerManifestCryptoStream.Close();
}
public FileInfo CloneFile(
ManifestFileInfo copyFile,
DirectoryInfo copyToDirectory)
{
ManifestFileInfo innerManifestFileInfo =
HashToInnerFileMap[copyFile.FileHash];
FileInfo innerFileInfo =
InnerProxy.GetFile(innerManifestFileInfo);
byte[] keyData = CryptUtilities.MakeKeyBytesFromString(
OuterKeyString,
copyFile.FileHash.HashData);
String destFilePath =
Path.Combine(
copyToDirectory.FullName,
DefaultDecryptedTempFileName);
ReadCryptFile(
innerFileInfo,
keyData,
destFilePath);
FileInfo fileInfo =
new FileInfo(destFilePath);
// Make sure that the last-modified date matches that of the
// expected outer file. This is necessary because one inner file
// may correspond to several outer files - each of which might
// have separate dates.
fileInfo.LastWriteTimeUtc = copyFile.LastModifiedUtc;
return(fileInfo);
}
protected void SaveOuterManifest()
{
// Serialize the manifest to memory
MemoryStream serializedManifestStream =
new MemoryStream();
OuterManifest.WriteManifestStream(serializedManifestStream);
serializedManifestStream.Position = 0;
String tempFilePath =
Path.Combine(
InnerProxy.TempDirectory.FullName,
DefaultOuterManifestFileName);
// We use the inner GUID as salt for the outer manifest, so update
// it each time we write the outer manifest. The inner GUID is
// really useless anyways.
InnerProxy.Manifest.ChangeGUID();
byte[] outerKeyData = CryptUtilities.MakeKeyBytesFromString(
OuterKeyString,
InnerProxy.Manifest.Guid.ToByteArray());
byte[] cryptHash = WriteCryptFileAndHash(
serializedManifestStream,
outerKeyData,
tempFilePath);
// The new ManifestFileInfo is actually rooted in the inner
// Manifest object, but that is ok - although it is kind of a
// hack. The fact is that we don't maintain an actual Manifest
// object to mirror the inner manifest - and we know that the
// implementation of PutFile won't be affected by doing this.
ManifestDirectoryInfo parentDirectory =
InnerProxy.Manifest.RootDirectory;
ManifestFileInfo destManifestFile =
new ManifestFileInfo(
DefaultOuterManifestFileName,
parentDirectory);
destManifestFile.RegisteredUtc = DateTime.Now;
FileInfo outerManifestFileInfo = new FileInfo(tempFilePath);
destManifestFile.LastModifiedUtc =
outerManifestFileInfo.LastWriteTimeUtc;
destManifestFile.FileLength =
outerManifestFileInfo.Length;
destManifestFile.FileHash =
new FileHash(cryptHash, CryptUtilities.DefaultHashType);
InnerProxy.PutFile(ProxyToInner, destManifestFile);
}
protected void ValidateFile(
ManifestFileInfo outerManFileInfo,
Utilities.Console console)
{
ManifestFileInfo innerManifestFileInfo = null;
try
{
innerManifestFileInfo =
HashToInnerFileMap[outerManFileInfo.FileHash];
FileInfo innerFileInfo =
InnerProxy.GetFile(innerManifestFileInfo);
byte[] keyData = CryptUtilities.MakeKeyBytesFromString(
OuterKeyString,
outerManFileInfo.FileHash.HashData);
Stream sourceFileStream =
innerFileInfo.OpenRead();
Stream cryptoStream =
CryptUtilities.MakeDecryptionReadStreamFrom(
sourceFileStream,
keyData);
FileHash computedHash = FileHash.ComputeHash(
cryptoStream,
outerManFileInfo.FileHash.HashType);
if (computedHash.Equals(outerManFileInfo.FileHash) == false)
{
throw new Exception("FAILED VALIDATION");
}
}
catch (Exception e)
{
console.WriteLine(
Manifest.MakeStandardPathString(outerManFileInfo));
console.WriteLine(
Manifest.MakeNativePathString(innerManifestFileInfo));
console.WriteLine(e.Message);
console.WriteLine();
}
}
/// <summary>
/// Get rid of temp directory and cleanup orphaned files.
/// </summary>
public void CleanupBeforeExit()
{
if (myReadOnly == false &&
TempDirectory != null)
{
SaveOuterManifest();
// Removed orphaned data files
ResolveInnerOuter();
foreach (ManifestFileInfo nextFile in OrphanedInnerFiles)
{
InnerProxy.RemoveFile(nextFile);
}
TempDirectory.Delete(true);
TempDirectory = null;
InnerProxy.CleanupBeforeExit();
}
}
public void PutFile(
IRepositoryProxy sourceRepository,
ManifestFileInfo sourceManifestFile)
{
// Name the inner file with the hash of the hash. We protect
// the hash in this way because it is used as the salt to
// encrypt the data in the file, and it might provide some
// benefit to a cryptographic attack.
FileHash hashedHash = FileHash.ComputeHash(
sourceManifestFile.FileHash.HashData);
String hashedHashString = hashedHash.ToString();
// Only add the file data if we don't have it already.
if (myHashedStringMap.ContainsKey(hashedHashString) == false)
{
FileInfo sourceFileInfo =
sourceRepository.GetFile(sourceManifestFile);
byte[] keyData = CryptUtilities.MakeKeyBytesFromString(
OuterKeyString,
sourceManifestFile.FileHash.HashData);
// Use the inner proxy temp directory because that is likely
// the ultimate destination of the file and we don't want to
// copy the data if we can avoid it. This is a minor break in
// encapsulation but has a significant impact on performance.
String destFilePath =
Path.Combine(
InnerProxy.TempDirectory.FullName,
hashedHashString);
Stream sourceFileStream = sourceFileInfo.OpenRead();
byte[] cryptHash = WriteCryptFileAndHash(
sourceFileStream,
keyData,
destFilePath);
FileInfo cryptFileInfo =
new FileInfo(destFilePath);
// Make a dummy parent manifest directory to give to the inner
// proxy. This is actually rooted in the inner manifest, but
// that is ok - although it is kind of a hack. The fact is
// that we don't maintain an actual manifest to mirror the
// inner manifest - and we know that the implementation of
// PutFile won't be affected by doing this.
ManifestDirectoryInfo parentDirectory =
MakeInnerParentDirectory(
hashedHashString,
InnerProxy.Manifest.RootDirectory);
ManifestFileInfo destManifestFile =
new ManifestFileInfo(
hashedHashString,
parentDirectory);
destManifestFile.RegisteredUtc =
DateTime.UtcNow;
destManifestFile.LastModifiedUtc =
cryptFileInfo.LastWriteTimeUtc;
destManifestFile.FileLength =
cryptFileInfo.Length;
destManifestFile.FileHash =
new FileHash(cryptHash, CryptUtilities.DefaultHashType);
InnerProxy.PutFile(ProxyToInner, destManifestFile);
myHashedStringMap.Add(hashedHashString, destManifestFile);
myNeedToRegenerateFileMap = true;
}
ManifestFileInfo outerManifestFileInfo =
Manifest.PutFileFromOtherManifest(sourceManifestFile);
myManifestChanged = true;
}
