/*
Copyright (c) 2008-2009 TrueCrypt Developers Association. All rights reserved.
Governed by the TrueCrypt License 3.0 the full text of which is contained in
the file License.txt included in TrueCrypt binary and source code distribution
packages.
*/
#include "Platform/Serializer.h"
#include "Common/SecurityToken.h"
#include "Crc32.h"
#include "Keyfile.h"
#include "VolumeException.h"
namespace VeraCrypt
{
void Keyfile::Apply (const BufferPtr &pool) const
{
if (Path.IsDirectory())
throw ParameterIncorrect (SRC_POS);
File file;
Crc32 crc32;
size_t poolPos = 0;
uint64 totalLength = 0;
uint64 readLength;
SecureBuffer keyfileBuf (File::GetOptimalReadSize());
if (SecurityToken::IsKeyfilePathValid (Path))
{
// Apply keyfile generated by a security token
vector <byte> keyfileData;
SecurityToken::GetKeyfileData (SecurityTokenKeyfile (wstring (Path)), keyfileData);
if (keyfileData.size() < MinProcessedLength)
throw InsufficientData (SRC_POS, Path);
for (size_t i = 0; i < keyfileData.size(); i++)
{
uint32 crc = crc32.Process (keyfileData[i]);
pool[poolPos++] += (byte) (crc >> 24);
pool[poolPos++] += (byte) (crc >> 16);
pool[poolPos++] += (byte) (crc >> 8);
pool[poolPos++] += (byte) crc;
if (poolPos >= pool.Size())
poolPos = 0;
if (++totalLength >= MaxProcessedLength)
break;
}
Memory::Erase (&keyfileData.front(), keyfileData.size());
goto done;
}
file.Open (Path, File::OpenRead, File::ShareRead);
while ((readLength = file.Read (keyfileBuf)) > 0)
{
for (size_t i = 0; i < readLength; i++)
{
uint32 crc = crc32.Process (keyfileBuf[i]);
pool[poolPos++] += (byte) (crc >> 24);
pool[poolPos++] += (byte) (crc >> 16);
pool[poolPos++] += (byte) (crc >> 8);
pool[poolPos++] += (byte) crc;
if (poolPos >= pool.Size())
poolPos = 0;
if (++totalLength >= MaxProcessedLength)
goto done;
}
}
done:
if (totalLength < MinProcessedLength)
throw InsufficientData (SRC_POS, Path);
}
shared_ptr <VolumePassword> Keyfile::ApplyListToPassword (shared_ptr <KeyfileList> keyfiles, shared_ptr <VolumePassword> password)
{
if (!password)
password.reset (new VolumePassword);
if (!keyfiles || keyfiles->size() < 1)
return password;
KeyfileList keyfilesExp;
HiddenFileWasPresentInKeyfilePath = false;
// Enumerate directories
foreach (shared_ptr <Keyfile> keyfile, *keyfiles)
{
if (FilesystemPath (*keyfile).IsDirectory())
{
size_t keyfileCount = 0;
foreach_ref (const FilePath &path, Directory::GetFilePaths (*keyfile))
{
#ifdef TC_UNIX
// Skip hidden files
if (wstring (path.ToBaseName()).find (L'.') == 0)
{
HiddenFileWasPresentInKeyfilePath = true;
continue;
}
#endif
keyfilesExp.push_back (make_shared <Keyfile> (path));
++keyfileCount;
}
if (keyfileCount == 0)
throw KeyfilePathEmpty (SRC_POS, FilesystemPath (*keyfile));
}
else
{
keyfilesExp.push_back (keyfile);
}
}
make_shared_auto (VolumePassword, newPassword);
if (keyfilesExp.size() < 1)
{
newPassword->Set (*password);
}
else
{
SecureBuffer keyfilePool (VolumePassword::MaxSize);
// Pad password with zeros if shorter than max length
keyfilePool.Zero();
keyfilePool.CopyFrom (ConstBufferPtr (password->DataPtr(), password->Size()));
// Apply all keyfiles
foreach_ref (const Keyfile &k, keyfilesExp)
{
k.Apply (keyfilePool);
}
newPassword->Set (keyfilePool);
}
return newPassword;
}
shared_ptr <KeyfileList> Keyfile::DeserializeList (shared_ptr <Stream> stream, const string &name)
{
shared_ptr <KeyfileList> keyfiles;
Serializer sr (stream);
if (!sr.DeserializeBool (name + "Null"))
{
keyfiles.reset (new KeyfileList);
foreach (const wstring &k, sr.DeserializeWStringList (name))
keyfiles->push_back (make_shared <Keyfile> (k));
}
return keyfiles;
}
void Keyfile::SerializeList (shared_ptr <Stream> stream, const string &name, shared_ptr <KeyfileList> keyfiles)
{
Serializer sr (stream);
sr.Serialize (name + "Null", keyfiles == nullptr);
if (keyfiles)
{
list <wstring> sl;
foreach_ref (const Keyfile &k, *keyfiles)
sl.push_back (FilesystemPath (k));
sr.Serialize (name, sl);
}
}
bool Keyfile::HiddenFileWasPresentInKeyfilePath = false;
}