/* Copyright (c) 2008-2010 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 <set> #include "CoreBase.h" #include "RandomNumberGenerator.h" #include "Volume/Volume.h" namespace VeraCrypt { CoreBase::CoreBase () : DeviceChangeInProgress (false) { } CoreBase::~CoreBase () { } void CoreBase::ChangePassword (shared_ptr <Volume> openVolume, shared_ptr <VolumePassword> newPassword, shared_ptr <KeyfileList> newKeyfiles, shared_ptr <Pkcs5Kdf> newPkcs5Kdf, int wipeCount) const { if ((!newPassword || newPassword->Size() < 1) && (!newKeyfiles || newKeyfiles->empty())) throw PasswordEmpty (SRC_POS); if (!newPkcs5Kdf) newPkcs5Kdf = openVolume->GetPkcs5Kdf(); if ((openVolume->GetHeader()->GetFlags() & TC_HEADER_FLAG_ENCRYPTED_SYSTEM) != 0 && openVolume->GetType() == VolumeType::Hidden && openVolume->GetPath().IsDevice()) { throw EncryptedSystemRequired (SRC_POS); } RandomNumberGenerator::SetHash (newPkcs5Kdf->GetHash()); SecureBuffer newSalt (openVolume->GetSaltSize()); SecureBuffer newHeaderKey (VolumeHeader::GetLargestSerializedKeySize()); shared_ptr <VolumePassword> password (Keyfile::ApplyListToPassword (newKeyfiles, newPassword)); bool backupHeader = false; while (true) { for (int i = 1; i <= wipeCount; i++) { if (i == wipeCount) RandomNumberGenerator::GetData (newSalt); else RandomNumberGenerator::GetDataFast (newSalt); newPkcs5Kdf->DeriveKey (newHeaderKey, *password, newSalt); openVolume->ReEncryptHeader (backupHeader, newSalt, newHeaderKey, newPkcs5Kdf); openVolume->GetFile()->Flush(); } if (!openVolume->GetLayout()->HasBackupHeader() || backupHeader) break; backupHeader = true; } } void CoreBase::ChangePassword (shared_ptr <VolumePath> volumePath, bool preserveTimestamps, shared_ptr <VolumePassword> password, shared_ptr <KeyfileList> keyfiles, shared_ptr <VolumePassword> newPassword, shared_ptr <KeyfileList> newKeyfiles, shared_ptr <Pkcs5Kdf> newPkcs5Kdf, int wipeCount) const { shared_ptr <Volume> volume = OpenVolume (volumePath, preserveTimestamps, password, keyfiles); ChangePassword (volume, newPassword, newKeyfiles, newPkcs5Kdf, wipeCount); } void CoreBase::CoalesceSlotNumberAndMountPoint (MountOptions &options) const { if (options.SlotNumber < GetFirstSlotNumber()) { if (options.MountPoint && !options.MountPoint->IsEmpty()) options.SlotNumber = MountPointToSlotNumber (*options.MountPoint); else options.SlotNumber = GetFirstFreeSlotNumber(); } if (!IsSlotNumberAvailable (options.SlotNumber)) #ifdef TC_WINDOWS throw DriveLetterUnavailable (SRC_POS); #else throw VolumeSlotUnavailable (SRC_POS); #endif if (!options.NoFilesystem && (!options.MountPoint || options.MountPoint->IsEmpty())) options.MountPoint.reset (new DirectoryPath (SlotNumberToMountPoint (options.SlotNumber))); } void CoreBase::CreateKeyfile (const FilePath &keyfilePath) const { SecureBuffer keyfileBuffer (VolumePassword::MaxSize); RandomNumberGenerator::GetData (keyfileBuffer); File keyfile; keyfile.Open (keyfilePath, File::CreateWrite); keyfile.Write (keyfileBuffer); } VolumeSlotNumber CoreBase::GetFirstFreeSlotNumber (VolumeSlotNumber startFrom) const { if (startFrom < GetFirstSlotNumber()) startFrom = GetFirstSlotNumber(); set <VolumeSlotNumber> usedSlotNumbers; foreach_ref (const VolumeInfo &volume, GetMountedVolumes()) usedSlotNumbers.insert (volume.SlotNumber); for (VolumeSlotNumber slotNumber = startFrom; slotNumber <= GetLastSlotNumber(); ++slotNumber) { if (usedSlotNumbers.find (slotNumber) == usedSlotNumbers.end() && IsMountPointAvailable (SlotNumberToMountPoint (slotNumber))) return slotNumber; } #ifdef TC_WINDOWS throw DriveLetterUnavailable (SRC_POS); #else throw VolumeSlotUnavailable (SRC_POS); #endif } uint64 CoreBase::GetMaxHiddenVolumeSize (shared_ptr <Volume> outerVolume) const { uint32 sectorSize = outerVolume->GetSectorSize(); SecureBuffer bootSectorBuffer (sectorSize); outerVolume->ReadSectors (bootSectorBuffer, 0); int fatType; byte *bootSector = bootSectorBuffer.Ptr(); if (memcmp (bootSector + 54, "FAT12", 5) == 0) fatType = 12; else if (memcmp (bootSector + 54, "FAT16", 5) == 0) fatType = 16; else if (memcmp (bootSector + 82, "FAT32", 5) == 0) fatType = 32; else throw ParameterIncorrect (SRC_POS); uint32 clusterSize = bootSector[13] * sectorSize; uint32 reservedSectorCount = Endian::Little (*(uint16 *) (bootSector + 14)); uint32 fatCount = bootSector[16]; uint64 fatSectorCount; if (fatType == 32) fatSectorCount = Endian::Little (*(uint32 *) (bootSector + 36)); else fatSectorCount = Endian::Little (*(uint16 *) (bootSector + 22)); uint64 fatSize = fatSectorCount * sectorSize; uint64 fatStartOffset = reservedSectorCount * sectorSize; uint64 dataAreaOffset = reservedSectorCount * sectorSize + fatSize * fatCount; if (fatType < 32) dataAreaOffset += Endian::Little (*(uint16 *) (bootSector + 17)) * 32; SecureBuffer sector (sectorSize); // Find last used cluster for (uint64 readOffset = fatStartOffset + fatSize - sectorSize; readOffset >= fatStartOffset; readOffset -= sectorSize) { outerVolume->ReadSectors (sector, readOffset); for (int offset = sectorSize - 4; offset >= 0; offset -= 4) { if (*(uint32 *) (sector.Ptr() + offset)) { uint64 clusterNumber = readOffset - fatStartOffset + offset; if (fatType == 12) clusterNumber = (clusterNumber * 8) / 12; else if (fatType == 16) clusterNumber /= 2; else if (fatType == 32) clusterNumber /= 4; uint64 maxSize = outerVolume->GetSize() - dataAreaOffset; // Some FAT entries may span over sector boundaries if (maxSize >= clusterSize) maxSize -= clusterSize; uint64 clusterOffset = clusterNumber * clusterSize; if (maxSize < clusterOffset) return 0; return maxSize - clusterOffset; } } } return 0; } shared_ptr <VolumeInfo> CoreBase::GetMountedVolume (const VolumePath &volumePath) const { VolumeInfoList volumes = GetMountedVolumes (volumePath); if (volumes.empty()) return shared_ptr <VolumeInfo> (); else return volumes.front(); } shared_ptr <VolumeInfo> CoreBase::GetMountedVolume (VolumeSlotNumber slot) const { foreach (shared_ptr <VolumeInfo> volume, GetMountedVolumes()) { if (volume->SlotNumber == slot) return volume; } return shared_ptr <VolumeInfo> (); } bool CoreBase::IsSlotNumberAvailable (VolumeSlotNumber slotNumber) const { if (!IsMountPointAvailable (SlotNumberToMountPoint (slotNumber))) return false; foreach_ref (const VolumeInfo &volume, GetMountedVolumes()) { if (volume.SlotNumber == slotNumber) return false; } return true; } bool CoreBase::IsVolumeMounted (const VolumePath &volumePath) const { return GetMountedVolume (volumePath); } shared_ptr <Volume> CoreBase::OpenVolume (shared_ptr <VolumePath> volumePath, bool preserveTimestamps, shared_ptr <VolumePassword> password, shared_ptr <KeyfileList> keyfiles, VolumeProtection::Enum protection, shared_ptr <VolumePassword> protectionPassword, shared_ptr <KeyfileList> protectionKeyfiles, bool sharedAccessAllowed, VolumeType::Enum volumeType, bool useBackupHeaders, bool partitionInSystemEncryptionScope) const { make_shared_auto (Volume, volume); volume->Open (*volumePath, preserveTimestamps, password, keyfiles, protection, protectionPassword, protectionKeyfiles, sharedAccessAllowed, volumeType, useBackupHeaders, partitionInSystemEncryptionScope); return volume; } void CoreBase::RandomizeEncryptionAlgorithmKey (shared_ptr <EncryptionAlgorithm> encryptionAlgorithm) const { SecureBuffer eaKey (encryptionAlgorithm->GetKeySize()); RandomNumberGenerator::GetData (eaKey); encryptionAlgorithm->SetKey (eaKey); SecureBuffer modeKey (encryptionAlgorithm->GetMode()->GetKeySize()); RandomNumberGenerator::GetData (modeKey); encryptionAlgorithm->GetMode()->SetKey (modeKey); } void CoreBase::ReEncryptVolumeHeaderWithNewSalt (const BufferPtr &newHeaderBuffer, shared_ptr <VolumeHeader> header, shared_ptr <VolumePassword> password, shared_ptr <KeyfileList> keyfiles) const { shared_ptr <Pkcs5Kdf> pkcs5Kdf = header->GetPkcs5Kdf(); RandomNumberGenerator::SetHash (pkcs5Kdf->GetHash()); SecureBuffer newSalt (header->GetSaltSize()); SecureBuffer newHeaderKey (VolumeHeader::GetLargestSerializedKeySize()); shared_ptr <VolumePassword> passwordKey (Keyfile::ApplyListToPassword (keyfiles, password)); RandomNumberGenerator::GetData (newSalt); pkcs5Kdf->DeriveKey (newHeaderKey, *passwordKey, newSalt); header->EncryptNew (newHeaderBuffer, newSalt, newHeaderKey, pkcs5Kdf); } }