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/*
Derived from source code of TrueCrypt 7.1a, which is
Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
by the TrueCrypt License 3.0.
Modifications and additions to the original source code (contained in this file)
and all other portions of this file are Copyright (c) 2013-2017 IDRIX
and are governed by the Apache License 2.0 the full text of which is
contained in the file License.txt included in VeraCrypt 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;
}
burn (&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 (password->Size() <= VolumePassword::MaxLegacySize? VolumePassword::MaxLegacySize: 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;
}
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