VeraCrypt
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2017-08-02Windows: Increment version to 1.22-BETA3Mounir IDRASSI2-4/+4
2017-07-29Windows: increment version to 1.22-BETA2-Build6Mounir IDRASSI1-2/+2
2017-07-29Windows: Add portable installer that only extra binaries without the need of ...Mounir IDRASSI8-21/+728
2017-07-27Windows: increment version to 1.22-BETA2-Build5Mounir IDRASSI1-2/+2
2017-07-23Windows: Increment version to 1.22-BETA2-Build1Mounir IDRASSI1-2/+2
2017-07-23Windows: display notice about creating new Rescue Disk at first boot after up...Mounir IDRASSI2-0/+9
2017-07-20Windows: fix truncated license text in installer wizard.Mounir IDRASSI2-5/+13
2017-07-20Windows: Increment version to 1.22-BETA1-Build4Mounir IDRASSI1-4/+4
2017-07-19Windows: Increment version to 1.22-BETA0Mounir IDRASSI1-2/+2
2017-07-10Add support for building under FreeBSD 11Mounir IDRASSI3-0/+1121
2017-07-09Windows: generate pdb files for binaries in order to help investigate crashes...Mounir IDRASSI1-3/+2
2017-07-09Increment version to 1.21.5Mounir IDRASSI2-3/+3
2017-07-05Increment version to 1.21.4Mounir IDRASSI2-3/+3
2017-07-04Increment version to 1.21.3Mounir IDRASSI2-3/+3
2017-07-02Windows: increment version to 1.21.2Mounir IDRASSI1-2/+2
2017-07-02Increment version to 1.21 (1.21.1)Mounir IDRASSI2-6/+6
2017-06-29Update release date and increment version to 1.20.3.4Mounir IDRASSI1-2/+2
2017-06-27MacOSX: Update build and packaging scripts to require OSX Lion (10.7).Mounir IDRASSI1-4/+4
2017-06-23Update IDRIX copyright yearMounir IDRASSI11-11/+11
2017-06-23Increment version to 1.20 (1.20.3)Mounir IDRASSI2-6/+6
2017-06-11Windows: various fixes following Coverity analysis.Mounir IDRASSI1-1/+1
2017-06-11Windows: Remove unused method ReadEfiConfigMounir IDRASSI1-15/+10
2017-06-10Windows Security: built binaries with support for Address Space Layout Random...Mounir IDRASSI1-1/+1
2017-06-05Windows: create dedicated project for zip library and link other binaries aga...Mounir IDRASSI2-548/+4
2017-06-05Beta2 patch 1kavsrf1-2/+2
2017-06-05Linux/MacOSX: Replace User Guide PDF with local HTML documentation. Replace U...Mounir IDRASSI1-3/+1
2017-06-05Windows: move language XML files to new "Languages" folder in the installatio...Mounir IDRASSI2-102/+13
2017-06-05Windows: Correctly open online help when selected in menu. Remove unused para...Mounir IDRASSI1-7/+3
2017-06-05Windows: Move User Guide CHM file under "docs" folderMounir IDRASSI1-2/+0
2017-06-05Windows: Install CHM User Guide instead of PDF one. Delete existing PDF when ...Mounir IDRASSI2-3/+26
2017-06-02Windows: remove reference to unused files XUnzip.h/XZip.h in Visual Studio pr...Mounir IDRASSI2-8/+0
2017-05-15Windows: Add HTML documentation to Windows installer.Mounir IDRASSI2-23/+49
2017-05-15Replace Codeplex links by ones on veracrypt.frMounir IDRASSI1-3/+3
2016-12-30Increment version to 1.20 BETA2 (1.20.2)Mounir IDRASSI2-6/+6
2016-12-08Increment version to 1.20 BETA1 (1.20.1)Mounir IDRASSI2-6/+6
2016-10-17Windows: Remove VeraCrypt from EFI boot partition after decrypting the systemMounir IDRASSI1-17/+1
2016-10-17Increment version to 1.19 (1.19.4)Mounir IDRASSI2-6/+6
2016-10-17Update documentation and increment version to 1.19 BETA3 (1.19.3)Mounir IDRASSI2-6/+6
2016-10-17Windows Setup: fix compilation error caused by change in declaration of funct...Mounir IDRASSI1-1/+1
2016-10-17MacOSX: remove MacFUSE dependency and link against OSXFuse library. Now, only...Mounir IDRASSI1-49/+2
2016-10-17Windows: exclude unused libzip source files from build.Mounir IDRASSI1-6/+24
2016-10-17Windows Setup: correct call to CryptAcquireContext to use memory only contain...Mounir IDRASSI1-6/+2
2016-10-17Windows: use zlib compress/uncompress functions directly in the Setup instead...Mounir IDRASSI1-136/+21
2016-10-17Windows: Replace XZip/XUnzip library with zlib and libzip and include the sou...Mounir IDRASSI2-16/+530
2016-08-21Increment version to 1.19 BETA2 (1.19.2)Mounir IDRASSI2-6/+6
2016-08-16Increment version to 1.18. Update user guide PDF file.VeraCrypt_1.18_PreReleaseMounir IDRASSI2-10/+10
2016-08-15Windows: Add XZip library files (http://www.codeproject.com/Articles/4135/XZi...Mounir IDRASSI2-0/+16
2016-08-15Windows: Implement support for EFI system encryption in Windows GUI.Mounir IDRASSI1-3/+8
2016-06-17Windows: Use Visual C++ 2010 instead of Visual C++ 2008.Mounir IDRASSI3-0/+389
2016-05-10Remove trailing whitespaceDavid Foerster15-177/+177
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/*
 Copyright (c) 2008-2011 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 "Bios.h"
#include "BootConsoleIo.h"
#include "BootConfig.h"
#include "BootDebug.h"
#include "BootDefs.h"
#include "BootDiskIo.h"
#include "BootStrings.h"


byte SectorBuffer[TC_LB_SIZE];

#ifdef TC_BOOT_DEBUG_ENABLED
static bool SectorBufferInUse = false;

void AcquireSectorBuffer ()
{
	if (SectorBufferInUse)
		TC_THROW_FATAL_EXCEPTION;

	SectorBufferInUse = true;
}


void ReleaseSectorBuffer ()
{
	SectorBufferInUse = false;
}

#endif


bool IsLbaSupported (byte drive)
{
	static byte CachedDrive = TC_INVALID_BIOS_DRIVE;
	static bool CachedStatus;
	uint16 result = 0;

	if (CachedDrive == drive)
		goto ret;

	__asm
	{
		mov bx, 0x55aa
		mov dl, drive
		mov ah, 0x41
		int 0x13
		jc err
		mov result, bx
	err:
	}

	CachedDrive = drive;
	CachedStatus = (result == 0xaa55);
ret:
	return CachedStatus;
}


void PrintDiskError (BiosResult error, bool write, byte drive, const uint64 *sector, const ChsAddress *chs)
{
	PrintEndl();
	Print (write ? "Write" : "Read"); Print (" error:");
	Print (error);
	Print (" Drive:");
	Print (drive ^ 0x80);

	if (sector)
	{
		Print (" Sector:");
		Print (*sector);
	}

	if (chs)
	{
		Print (" CHS:");
		Print (*chs);
	}

	PrintEndl();
	Beep();
}


void Print (const ChsAddress &chs)
{
	Print (chs.Cylinder);
	PrintChar ('/');
	Print (chs.Head);
	PrintChar ('/');
	Print (chs.Sector);
}


void PrintSectorCountInMB (const uint64 &sectorCount)
{
	Print (sectorCount >> (TC_LB_SIZE_BIT_SHIFT_DIVISOR + 2)); Print (" MB ");
}


BiosResult ReadWriteSectors (bool write, uint16 bufferSegment, uint16 bufferOffset, byte drive, const ChsAddress &chs, byte sectorCount, bool silent)
{
	CheckStack();

	byte cylinderLow = (byte) chs.Cylinder;
	byte sector = chs.Sector;
	sector |= byte (chs.Cylinder >> 2) & 0xc0;
	byte function = write ? 0x03 : 0x02;

	BiosResult result;
	byte tryCount = TC_MAX_BIOS_DISK_IO_RETRIES;

	do
	{
		result = BiosResultSuccess;

		__asm
		{
			push es
			mov ax, bufferSegment
			mov	es, ax
			mov	bx, bufferOffset
			mov dl, drive
			mov ch, cylinderLow
			mov si, chs
			mov dh, [si].Head
			mov cl, sector
			mov	al, sectorCount
			mov	ah, function
			int	0x13
			jnc ok				// If CF=0, ignore AH to prevent issues caused by potential bugs in BIOSes
			mov	result, ah
		ok:
			pop es
		}

		if (result == BiosResultEccCorrected)
			result = BiosResultSuccess;

	// Some BIOSes report I/O errors prematurely in some cases
	} while (result != BiosResultSuccess && --tryCount != 0);

	if (!silent && result != BiosResultSuccess)
		PrintDiskError (result, write, drive, nullptr, &chs);

	return result;
}


BiosResult ReadWriteSectors (bool write, byte *buffer, byte drive, const ChsAddress &chs, byte sectorCount, bool silent)
{
	uint16 codeSeg;
	__asm mov codeSeg, cs
	return ReadWriteSectors (write, codeSeg, (uint16) buffer, drive, chs, sectorCount, silent);
}


BiosResult ReadSectors (byte *buffer, byte drive, const ChsAddress &chs, byte sectorCount, bool silent)
{
	return ReadWriteSectors (false, buffer, drive, chs, sectorCount, silent);
}


BiosResult WriteSectors (byte *buffer, byte drive, const ChsAddress &chs, byte sectorCount, bool silent)
{
	return ReadWriteSectors (true, buffer, drive, chs, sectorCount, silent);
}


static BiosResult ReadWriteSectors (bool write, BiosLbaPacket &dapPacket, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	CheckStack();

	if (!IsLbaSupported (drive))
	{
		DriveGeometry geometry;

		BiosResult result = GetDriveGeometry (drive, geometry, silent);
		if (result != BiosResultSuccess)
			return result;

		ChsAddress chs;
		LbaToChs (geometry, sector, chs);
		return ReadWriteSectors (write, (uint16) (dapPacket.Buffer >> 16), (uint16) dapPacket.Buffer, drive, chs, sectorCount, silent);
	}

	dapPacket.Size = sizeof (dapPacket);
	dapPacket.Reserved = 0;
	dapPacket.SectorCount = sectorCount;
	dapPacket.Sector = sector;

	byte function = write ? 0x43 : 0x42;
	
	BiosResult result;
	byte tryCount = TC_MAX_BIOS_DISK_IO_RETRIES;

	do
	{
		result = BiosResultSuccess;

		__asm
		{
			mov	bx, 0x55aa
			mov	dl, drive
			mov si, [dapPacket]
			mov	ah, function
			xor al, al
			int	0x13
			jnc ok				// If CF=0, ignore AH to prevent issues caused by potential bugs in BIOSes
			mov	result, ah
		ok:
		}

		if (result == BiosResultEccCorrected)
			result = BiosResultSuccess;

	// Some BIOSes report I/O errors prematurely in some cases
	} while (result != BiosResultSuccess && --tryCount != 0);

	if (!silent && result != BiosResultSuccess)
		PrintDiskError (result, write, drive, &sector);

	return result;
}


static BiosResult ReadWriteSectors (bool write, byte *buffer, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	BiosLbaPacket dapPacket;
	dapPacket.Buffer = (uint32) buffer;
	return ReadWriteSectors (write, dapPacket, drive, sector, sectorCount, silent);
}


BiosResult ReadWriteSectors (bool write, uint16 bufferSegment, uint16 bufferOffset, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	BiosLbaPacket dapPacket;
	dapPacket.Buffer = ((uint32) bufferSegment << 16) | bufferOffset;
	return ReadWriteSectors (write, dapPacket, drive, sector, sectorCount, silent);
}

BiosResult ReadSectors (uint16 bufferSegment, uint16 bufferOffset, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	return ReadWriteSectors (false, bufferSegment, bufferOffset, drive, sector, sectorCount, silent);
}


BiosResult ReadSectors (byte *buffer, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	BiosResult result;
	uint16 codeSeg;
	__asm mov codeSeg, cs
	
	result = ReadSectors (BootStarted ? codeSeg : TC_BOOT_LOADER_ALT_SEGMENT, (uint16) buffer, drive, sector, sectorCount, silent);

	// Alternative segment is used to prevent memory corruption caused by buggy BIOSes
	if (!BootStarted)
		CopyMemory (TC_BOOT_LOADER_ALT_SEGMENT, (uint16) buffer, buffer, sectorCount * TC_LB_SIZE);

	return result;
}


BiosResult WriteSectors (byte *buffer, byte drive, const uint64 &sector, uint16 sectorCount, bool silent)
{
	return ReadWriteSectors (true, buffer, drive, sector, sectorCount, silent);
}


BiosResult GetDriveGeometry (byte drive, DriveGeometry &geometry, bool silent)
{
	CheckStack();

	byte maxCylinderLow, maxHead, maxSector;
	BiosResult result;
	__asm
	{
		push es
		mov dl, drive
		mov ah, 0x08
		int	0x13

		mov	result, ah
		mov maxCylinderLow, ch
		mov maxSector, cl
		mov maxHead, dh
		pop es
	}

	if (result == BiosResultSuccess)
	{
		geometry.Cylinders = (maxCylinderLow | (uint16 (maxSector & 0xc0) << 2)) + 1;
		geometry.Heads = maxHead + 1;
		geometry.Sectors = maxSector & ~0xc0;
	}
	else if (!silent)
	{
		Print ("Drive ");
		Print (drive ^ 0x80);
		Print (" not found: ");
		PrintErrorNoEndl ("");
		Print (result);
		PrintEndl();
	}

	return result;
}


void ChsToLba (const DriveGeometry &geometry, const ChsAddress &chs, uint64 &lba)
{
	lba.HighPart = 0;
	lba.LowPart = (uint32 (chs.Cylinder) * geometry.Heads + chs.Head) * geometry.Sectors + chs.Sector - 1;
}


void LbaToChs (const DriveGeometry &geometry, const uint64 &lba, ChsAddress &chs)
{
	chs.Sector = (byte) ((lba.LowPart % geometry.Sectors) + 1);
	uint32 ch = lba.LowPart / geometry.Sectors;
	chs.Head = (byte) (ch % geometry.Heads);
	chs.Cylinder = (uint16) (ch / geometry.Heads);
}


void PartitionEntryMBRToPartition (const PartitionEntryMBR &partEntry, Partition &partition)
{
	partition.Active = partEntry.BootIndicator == 0x80;
	partition.EndSector.HighPart = 0;
	partition.EndSector.LowPart = partEntry.StartLBA + partEntry.SectorCountLBA - 1;
	partition.SectorCount.HighPart = 0;
	partition.SectorCount.LowPart = partEntry.SectorCountLBA;
	partition.StartSector.HighPart = 0;
	partition.StartSector.LowPart = partEntry.StartLBA;
	partition.Type = partEntry.Type;
}


BiosResult ReadWriteMBR (bool write, byte drive, bool silent)
{
	uint64 mbrSector;
	mbrSector.HighPart = 0;
	mbrSector.LowPart = 0;

	if (write)
		return WriteSectors (SectorBuffer, drive, mbrSector, 1, silent);

	return ReadSectors (SectorBuffer, drive, mbrSector, 1, silent);		// Uses alternative segment
}


BiosResult GetDrivePartitions (byte drive, Partition *partitionArray, size_t partitionArrayCapacity, size_t &partitionCount, bool activeOnly, Partition *findPartitionFollowingThis, bool silent)
{
	Partition *followingPartition;
	Partition tmpPartition;

	if (findPartitionFollowingThis)
	{
		assert (partitionArrayCapacity == 1);
		partitionArrayCapacity = 0xff;
		followingPartition = partitionArray;
		partitionArray = &tmpPartition;

		followingPartition->Drive = TC_INVALID_BIOS_DRIVE;
		followingPartition->StartSector.LowPart = 0xFFFFffffUL;
	}

	AcquireSectorBuffer();
	BiosResult result = ReadWriteMBR (false, drive, silent);
	ReleaseSectorBuffer();

	partitionCount = 0;

	MBR *mbr = (MBR *) SectorBuffer;
	if (result != BiosResultSuccess || mbr->Signature != 0xaa55)
		return result;

	PartitionEntryMBR mbrPartitions[4];
	memcpy (mbrPartitions, mbr->Partitions, sizeof (mbrPartitions));
	size_t partitionArrayPos = 0, partitionNumber;
	
	for (partitionNumber = 0;
		partitionNumber < array_capacity (mbrPartitions) && partitionArrayPos < partitionArrayCapacity;
		++partitionNumber)
	{
		const PartitionEntryMBR &partEntry = mbrPartitions[partitionNumber];
		
		if (partEntry.SectorCountLBA > 0)
		{
			Partition &partition = partitionArray[partitionArrayPos];
			PartitionEntryMBRToPartition (partEntry, partition);

			if (activeOnly && !partition.Active)
				continue;

			partition.Drive = drive;
			partition.Number = partitionArrayPos;

			if (partEntry.Type == 0x5 || partEntry.Type == 0xf) // Extended partition
			{
				if (IsLbaSupported (drive))
				{
					// Find all extended partitions
					uint64 firstExtStartLBA = partition.StartSector;
					uint64 extStartLBA = partition.StartSector;
					MBR *extMbr = (MBR *) SectorBuffer;

					while (partitionArrayPos < partitionArrayCapacity &&
						(result = ReadSectors ((byte *) extMbr, drive, extStartLBA, 1, silent)) == BiosResultSuccess
						&& extMbr->Signature == 0xaa55)
					{
						if (extMbr->Partitions[0].SectorCountLBA > 0)
						{
							Partition &logPart = partitionArray[partitionArrayPos];
							PartitionEntryMBRToPartition (extMbr->Partitions[0], logPart);
							logPart.Drive = drive;

							logPart.Number = partitionArrayPos;
							logPart.Primary = false;

							logPart.StartSector.LowPart += extStartLBA.LowPart;
							logPart.EndSector.LowPart += extStartLBA.LowPart;

							if (findPartitionFollowingThis)
							{
								if (logPart.StartSector.LowPart > findPartitionFollowingThis->EndSector.LowPart
									&& logPart.StartSector.LowPart < followingPartition->StartSector.LowPart)
								{
									*followingPartition = logPart;
								}
							}
							else
								++partitionArrayPos;
						}

						// Secondary extended
						if (extMbr->Partitions[1].Type != 0x5 && extMbr->Partitions[1].Type == 0xf
							|| extMbr->Partitions[1].SectorCountLBA == 0)
							break;

						extStartLBA.LowPart = extMbr->Partitions[1].StartLBA + firstExtStartLBA.LowPart;
					}
				}
			}
			else
			{
				partition.Primary = true;

				if (findPartitionFollowingThis)
				{
					if (partition.StartSector.LowPart > findPartitionFollowingThis->EndSector.LowPart
						&& partition.StartSector.LowPart < followingPartition->StartSector.LowPart)
					{
						*followingPartition = partition;
					}
				}
				else
					++partitionArrayPos;
			}
		}
	}

	partitionCount = partitionArrayPos;
	return result;
}


bool GetActivePartition (byte drive)
{
	size_t partCount;

	if (GetDrivePartitions (drive, &ActivePartition, 1, partCount, true) != BiosResultSuccess || partCount < 1)
	{
		ActivePartition.Drive = TC_INVALID_BIOS_DRIVE;
		PrintError (TC_BOOT_STR_NO_BOOT_PARTITION);
		return false;
	}
	
	return true;
}