/* 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. */ #ifndef TC_WINDOWS #include <errno.h> #endif #include "EncryptionModeXTS.h" #include "Volume.h" #include "VolumeHeader.h" #include "VolumeLayout.h" #include "Common/Crypto.h" namespace VeraCrypt { Volume::Volume () : HiddenVolumeProtectionTriggered (false), SystemEncryption (false), VolumeDataOffset (0), VolumeDataSize (0), EncryptedDataSize (0), TopWriteOffset (0), TotalDataRead (0), TotalDataWritten (0), TrueCryptMode (false), Pim (0), EncryptionNotCompleted (false) { } Volume::~Volume () { } void Volume::CheckProtectedRange (uint64 writeHostOffset, uint64 writeLength) { uint64 writeHostEndOffset = writeHostOffset + writeLength - 1; if ((writeHostOffset < ProtectedRangeStart) ? (writeHostEndOffset >= ProtectedRangeStart) : (writeHostOffset <= ProtectedRangeEnd - 1)) { HiddenVolumeProtectionTriggered = true; throw VolumeProtected (SRC_POS); } } void Volume::Close () { if (VolumeFile.get() == nullptr) throw NotInitialized (SRC_POS); VolumeFile.reset(); } shared_ptr <EncryptionAlgorithm> Volume::GetEncryptionAlgorithm () const { if_debug (ValidateState ()); return EA; } shared_ptr <EncryptionMode> Volume::GetEncryptionMode () const { if_debug (ValidateState ()); return EA->GetMode(); } void Volume::Open (const VolumePath &volumePath, bool preserveTimestamps, shared_ptr <VolumePassword> password, int pim, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, shared_ptr <KeyfileList> keyfiles, VolumeProtection::Enum protection, shared_ptr <VolumePassword> protectionPassword, int protectionPim, shared_ptr <Pkcs5Kdf> protectionKdf, shared_ptr <KeyfileList> protectionKeyfiles, bool sharedAccessAllowed, VolumeType::Enum volumeType, bool useBackupHeaders, bool partitionInSystemEncryptionScope) { make_shared_auto (File, file); File::FileOpenFlags flags = (preserveTimestamps ? File::PreserveTimestamps : File::FlagsNone); try { if (protection == VolumeProtection::ReadOnly) file->Open (volumePath, File::OpenRead, File::ShareRead, flags); else file->Open (volumePath, File::OpenReadWrite, File::ShareNone, flags); } catch (SystemException &e) { if (e.GetErrorCode() == #ifdef TC_WINDOWS ERROR_SHARING_VIOLATION) #else EAGAIN) #endif { if (!sharedAccessAllowed) throw VolumeHostInUse (SRC_POS); file->Open (volumePath, protection == VolumeProtection::ReadOnly ? File::OpenRead : File::OpenReadWrite, File::ShareReadWriteIgnoreLock, flags); } else throw; } return Open (file, password, pim, kdf, truecryptMode, keyfiles, protection, protectionPassword, protectionPim, protectionKdf,protectionKeyfiles, volumeType, useBackupHeaders, partitionInSystemEncryptionScope); } void Volume::Open (shared_ptr <File> volumeFile, shared_ptr <VolumePassword> password, int pim, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, shared_ptr <KeyfileList> keyfiles, VolumeProtection::Enum protection, shared_ptr <VolumePassword> protectionPassword, int protectionPim, shared_ptr <Pkcs5Kdf> protectionKdf,shared_ptr <KeyfileList> protectionKeyfiles, VolumeType::Enum volumeType, bool useBackupHeaders, bool partitionInSystemEncryptionScope) { if (!volumeFile) throw ParameterIncorrect (SRC_POS); // TrueCrypt doesn't support SHA-256 if (kdf && truecryptMode && (kdf->GetName() == L"HMAC-SHA-256")) throw UnsupportedAlgoInTrueCryptMode (SRC_POS); Protection = protection; VolumeFile = volumeFile; SystemEncryption = partitionInSystemEncryptionScope; try { VolumeHostSize = VolumeFile->Length(); shared_ptr <VolumePassword> passwordKey = Keyfile::ApplyListToPassword (keyfiles, password); bool skipLayoutV1Normal = false; // Test volume layouts foreach (shared_ptr <VolumeLayout> layout, VolumeLayout::GetAvailableLayouts (volumeType)) { if (skipLayoutV1Normal && typeid (*layout) == typeid (VolumeLayoutV1Normal)) { // Skip VolumeLayoutV1Normal as it shares header location with VolumeLayoutV2Normal continue; } if (useBackupHeaders && !layout->HasBackupHeader()) continue; SecureBuffer headerBuffer (layout->GetHeaderSize()); if (layout->HasDriveHeader()) { if (!partitionInSystemEncryptionScope) continue; if (!GetPath().IsDevice()) throw PartitionDeviceRequired (SRC_POS); File driveDevice; driveDevice.Open (DevicePath (wstring (GetPath())).ToHostDriveOfPartition()); int headerOffset = layout->GetHeaderOffset(); if (headerOffset >= 0) driveDevice.SeekAt (headerOffset); else driveDevice.SeekEnd (headerOffset); if (driveDevice.Read (headerBuffer) != layout->GetHeaderSize()) continue; } else { if (partitionInSystemEncryptionScope) continue; int headerOffset = useBackupHeaders ? layout->GetBackupHeaderOffset() : layout->GetHeaderOffset(); if (headerOffset >= 0) VolumeFile->SeekAt (headerOffset); else VolumeFile->SeekEnd (headerOffset); if (VolumeFile->Read (headerBuffer) != layout->GetHeaderSize()) continue; } EncryptionAlgorithmList layoutEncryptionAlgorithms = layout->GetSupportedEncryptionAlgorithms(); EncryptionModeList layoutEncryptionModes = layout->GetSupportedEncryptionModes(); if (typeid (*layout) == typeid (VolumeLayoutV2Normal)) { skipLayoutV1Normal = true; // Test all algorithms and modes of VolumeLayoutV1Normal as it shares header location with VolumeLayoutV2Normal layoutEncryptionAlgorithms = EncryptionAlgorithm::GetAvailableAlgorithms(); layoutEncryptionModes = EncryptionMode::GetAvailableModes(); } shared_ptr <VolumeHeader> header = layout->GetHeader(); if (header->Decrypt (headerBuffer, *passwordKey, pim, kdf, truecryptMode, layout->GetSupportedKeyDerivationFunctions(truecryptMode), layoutEncryptionAlgorithms, layoutEncryptionModes)) { // Header decrypted if (!truecryptMode && typeid (*layout) == typeid (VolumeLayoutV2Normal) && header->GetRequiredMinProgramVersion() < 0x10b) { // VolumeLayoutV1Normal has been opened as VolumeLayoutV2Normal layout.reset (new VolumeLayoutV1Normal); header->SetSize (layout->GetHeaderSize()); layout->SetHeader (header); } TrueCryptMode = truecryptMode; Pim = pim; Type = layout->GetType(); SectorSize = header->GetSectorSize(); VolumeDataOffset = layout->GetDataOffset (VolumeHostSize); VolumeDataSize = layout->GetDataSize (VolumeHostSize); EncryptedDataSize = header->GetEncryptedAreaLength(); Header = header; Layout = layout; EA = header->GetEncryptionAlgorithm(); EncryptionMode &mode = *EA->GetMode(); if (layout->HasDriveHeader()) { if (header->GetEncryptedAreaLength() != header->GetVolumeDataSize()) { EncryptionNotCompleted = true; // we avoid writing data to the partition since it is only partially encrypted Protection = VolumeProtection::ReadOnly; } uint64 partitionStartOffset = VolumeFile->GetPartitionDeviceStartOffset(); if (partitionStartOffset < header->GetEncryptedAreaStart() || partitionStartOffset >= header->GetEncryptedAreaStart() + header->GetEncryptedAreaLength()) throw PasswordIncorrect (SRC_POS); EncryptedDataSize -= partitionStartOffset - header->GetEncryptedAreaStart(); mode.SetSectorOffset (partitionStartOffset / ENCRYPTION_DATA_UNIT_SIZE); } // Volume protection if (Protection == VolumeProtection::HiddenVolumeReadOnly) { if (Type == VolumeType::Hidden) throw PasswordIncorrect (SRC_POS); else { try { Volume protectedVolume; protectedVolume.Open (VolumeFile, protectionPassword, protectionPim, protectionKdf, truecryptMode, protectionKeyfiles, VolumeProtection::ReadOnly, shared_ptr <VolumePassword> (), 0, shared_ptr <Pkcs5Kdf> (),shared_ptr <KeyfileList> (), VolumeType::Hidden, useBackupHeaders); if (protectedVolume.GetType() != VolumeType::Hidden) ParameterIncorrect (SRC_POS); ProtectedRangeStart = protectedVolume.VolumeDataOffset; ProtectedRangeEnd = protectedVolume.VolumeDataOffset + protectedVolume.VolumeDataSize; } catch (PasswordException&) { if (protectionKeyfiles && !protectionKeyfiles->empty()) throw ProtectionPasswordKeyfilesIncorrect (SRC_POS); throw ProtectionPasswordIncorrect (SRC_POS); } } } return; } } if (partitionInSystemEncryptionScope) throw PasswordOrKeyboardLayoutIncorrect (SRC_POS); if (!partitionInSystemEncryptionScope && GetPath().IsDevice()) { // Check if the device contains VeraCrypt Boot Loader try { File driveDevice; driveDevice.Open (DevicePath (wstring (GetPath())).ToHostDriveOfPartition()); Buffer mbr (VolumeFile->GetDeviceSectorSize()); driveDevice.ReadAt (mbr, 0); // Search for the string "VeraCrypt" or "TrueCrypt" const char* bootSignature = truecryptMode? "TrueCrypt" : TC_APP_NAME; size_t nameLen = strlen (bootSignature); for (size_t i = 0; i < mbr.Size() - nameLen; ++i) { if (memcmp (mbr.Ptr() + i, bootSignature, nameLen) == 0) throw PasswordOrMountOptionsIncorrect (SRC_POS); } } catch (PasswordOrMountOptionsIncorrect&) { throw; } catch (...) { } } if (keyfiles && !keyfiles->empty()) throw PasswordKeyfilesIncorrect (SRC_POS); throw PasswordIncorrect (SRC_POS); } catch (...) { Close(); throw; } } void Volume::ReadSectors (const BufferPtr &buffer, uint64 byteOffset) { if_debug (ValidateState ()); uint64 length = buffer.Size(); uint64 hostOffset = VolumeDataOffset + byteOffset; size_t bufferOffset = 0; if (length % SectorSize != 0 || byteOffset % SectorSize != 0) throw ParameterIncorrect (SRC_POS); if (VolumeFile->ReadAt (buffer, hostOffset) != length) throw MissingVolumeData (SRC_POS); // first sector can be unencrypted in some cases (e.g. windows repair) // detect this case by looking for NTFS header if (SystemEncryption && (hostOffset == 0) && ((BE64 (*(uint64 *) buffer.Get ())) == 0xEB52904E54465320ULL)) { bufferOffset = (size_t) SectorSize; hostOffset += SectorSize; length -= SectorSize; } if (length) { if (EncryptionNotCompleted) { // if encryption is not complete, we decrypt only the encrypted sectors if (hostOffset < EncryptedDataSize) { uint64 encryptedLength = VC_MIN (length, (EncryptedDataSize - hostOffset)); EA->DecryptSectors (buffer.GetRange (bufferOffset, encryptedLength), hostOffset / SectorSize, encryptedLength / SectorSize, SectorSize); } } else EA->DecryptSectors (buffer.GetRange (bufferOffset, length), hostOffset / SectorSize, length / SectorSize, SectorSize); } TotalDataRead += length; } void Volume::ReEncryptHeader (bool backupHeader, const ConstBufferPtr &newSalt, const ConstBufferPtr &newHeaderKey, shared_ptr <Pkcs5Kdf> newPkcs5Kdf) { if_debug (ValidateState ()); if (Protection == VolumeProtection::ReadOnly) throw VolumeReadOnly (SRC_POS); SecureBuffer newHeaderBuffer (Layout->GetHeaderSize()); Header->EncryptNew (newHeaderBuffer, newSalt, newHeaderKey, newPkcs5Kdf); int headerOffset = backupHeader ? Layout->GetBackupHeaderOffset() : Layout->GetHeaderOffset(); if (headerOffset >= 0) VolumeFile->SeekAt (headerOffset); else VolumeFile->SeekEnd (headerOffset); VolumeFile->Write (newHeaderBuffer); } void Volume::ValidateState () const { if (VolumeFile.get() == nullptr) throw NotInitialized (SRC_POS); } void Volume::WriteSectors (const ConstBufferPtr &buffer, uint64 byteOffset) { if_debug (ValidateState ()); uint64 length = buffer.Size(); uint64 hostOffset = VolumeDataOffset + byteOffset; if (length % SectorSize != 0 || byteOffset % SectorSize != 0 || byteOffset + length > VolumeDataSize) throw ParameterIncorrect (SRC_POS); if (Protection == VolumeProtection::ReadOnly) throw VolumeReadOnly (SRC_POS); if (HiddenVolumeProtectionTriggered) throw VolumeProtected (SRC_POS); if (Protection == VolumeProtection::HiddenVolumeReadOnly) CheckProtectedRange (hostOffset, length); SecureBuffer encBuf (buffer.Size()); encBuf.CopyFrom (buffer); EA->EncryptSectors (encBuf, hostOffset / SectorSize, length / SectorSize, SectorSize); VolumeFile->WriteAt (encBuf, hostOffset); TotalDataWritten += length; uint64 writeEndOffset = byteOffset + buffer.Size(); if (writeEndOffset > TopWriteOffset) TopWriteOffset = writeEndOffset; } }