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Linux/MacOSX/FreeBSD: better handling for mounting systen encrypted disks whose first sector has been overwritten (e.g. during windows repair).

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This commit is contained in:
Mounir IDRASSI 2018-06-13 18:03:21 +02:00
parent d5dca62b04
commit 22b9ca94b3
No known key found for this signature in database
GPG Key ID: DD0C382D5FCFB8FC
1 changed files with 16 additions and 16 deletions
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32
src/Volume/Volume.cpp
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@ -316,6 +316,7 @@ namespace VeraCrypt
uint64 length = buffer.Size();
uint64 hostOffset = VolumeDataOffset + byteOffset;
size_t bufferOffset = 0;
if (length % SectorSize != 0 || byteOffset % SectorSize != 0)
throw ParameterIncorrect (SRC_POS);
@ -323,31 +324,30 @@ namespace VeraCrypt
if (VolumeFile->ReadAt (buffer, hostOffset) != length)
throw MissingVolumeData (SRC_POS);
if (EncryptionNotCompleted)
// 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))
{
// if encryption is not complete, we decrypt only the encrypted sectors
if (hostOffset < EncryptedDataSize)
bufferOffset = (size_t) SectorSize;
hostOffset += SectorSize;
length -= SectorSize;
}
if (length)
{
if (EncryptionNotCompleted)
{
size_t bufferOffset = 0;
// first sector is not encrypted in case of incomplete encryption
if (hostOffset == 0)
{
bufferOffset = (size_t) SectorSize;
hostOffset += SectorSize;
length -= SectorSize;
}
if (length && (hostOffset < EncryptedDataSize))
// 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);
}
else
EA->DecryptSectors (buffer, hostOffset / SectorSize, length / SectorSize, SectorSize);
TotalDataRead += length;
}