/* 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. */ #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), VolumeDataSize (0), TopWriteOffset (0), TotalDataRead (0), TotalDataWritten (0), TrueCryptMode (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, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, shared_ptr <KeyfileList> keyfiles, VolumeProtection::Enum protection, shared_ptr <VolumePassword> protectionPassword, 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, kdf, truecryptMode, keyfiles, protection, protectionPassword, protectionKdf,protectionKeyfiles, volumeType, useBackupHeaders, partitionInSystemEncryptionScope); } void Volume::Open (shared_ptr <File> volumeFile, shared_ptr <VolumePassword> password, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, shared_ptr <KeyfileList> keyfiles, VolumeProtection::Enum protection, shared_ptr <VolumePassword> protectionPassword, 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; bool deviceHosted = GetPath().IsDevice(); size_t hostDeviceSectorSize = 0; if (deviceHosted) hostDeviceSectorSize = volumeFile->GetDeviceSectorSize(); // 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, 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; Type = layout->GetType(); SectorSize = header->GetSectorSize(); VolumeDataOffset = layout->GetDataOffset (VolumeHostSize); VolumeDataSize = layout->GetDataSize (VolumeHostSize); Header = header; Layout = layout; EA = header->GetEncryptionAlgorithm(); EncryptionMode &mode = *EA->GetMode(); if (layout->HasDriveHeader()) { if (header->GetEncryptedAreaLength() != header->GetVolumeDataSize()) throw VolumeEncryptionNotCompleted (SRC_POS); uint64 partitionStartOffset = VolumeFile->GetPartitionDeviceStartOffset(); if (partitionStartOffset < header->GetEncryptedAreaStart() || partitionStartOffset >= header->GetEncryptedAreaStart() + header->GetEncryptedAreaLength()) throw PasswordIncorrect (SRC_POS); 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, protectionKdf, truecryptMode, protectionKeyfiles, VolumeProtection::ReadOnly, shared_ptr <VolumePassword> (), 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; if (length % SectorSize != 0 || byteOffset % SectorSize != 0) throw ParameterIncorrect (SRC_POS); if (VolumeFile->ReadAt (buffer, hostOffset) != length) throw MissingVolumeData (SRC_POS); EA->DecryptSectors (buffer, 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; } }