VeraCrypt
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authorMounir IDRASSI <mounir.idrassi@idrix.fr>2019-01-09 00:25:06 +0100
committerMounir IDRASSI <mounir.idrassi@idrix.fr>2019-01-09 00:30:12 +0100
commit652e989d238fff2ade0de5a33a0e307e233c06e0 (patch)
tree21ead198c765bc51b839748ca06c7cdecea663d7 /src/Driver
parent7c2cf7889f96292d037c21c680b641f70a4d390f (diff)
downloadVeraCrypt-652e989d238fff2ade0de5a33a0e307e233c06e0.tar.gz
VeraCrypt-652e989d238fff2ade0de5a33a0e307e233c06e0.zip
Windows Security: Add new entry point in driver that allows emergency clearing of all encryption keys from memory. This entry point requires administrative privileges and it will caused BSDO when system encryption is active. It can be useful for example to applications that monitors physical access to the machine and which need to erase sensitive key material from RAM when unauthorized access is detected.
Diffstat (limited to 'src/Driver')
-rw-r--r--src/Driver/DriveFilter.c61
-rw-r--r--src/Driver/DriveFilter.h3
-rw-r--r--src/Driver/EncryptedIoQueue.c4
-rw-r--r--src/Driver/EncryptedIoQueue.h4
-rw-r--r--src/Driver/Ntdriver.c5
-rw-r--r--src/Driver/Ntdriver.h3
6 files changed, 74 insertions, 6 deletions
diff --git a/src/Driver/DriveFilter.c b/src/Driver/DriveFilter.c
index 2daf1f52..1ed6f8a3 100644
--- a/src/Driver/DriveFilter.c
+++ b/src/Driver/DriveFilter.c
@@ -288,13 +288,40 @@ static void DismountDrive (DriveFilterExtension *Extension, BOOL stopIoQueue)
if (stopIoQueue && EncryptedIoQueueIsRunning (&Extension->Queue))
EncryptedIoQueueStop (&Extension->Queue);
- crypto_close (Extension->Queue.CryptoInfo);
+ crypto_close ((PCRYPTO_INFO) Extension->Queue.CryptoInfo);
Extension->Queue.CryptoInfo = NULL;
- crypto_close (Extension->HeaderCryptoInfo);
+ crypto_close ((PCRYPTO_INFO) Extension->HeaderCryptoInfo);
Extension->HeaderCryptoInfo = NULL;
Extension->DriveMounted = FALSE;
+
+ Dump ("Drive dismount done!\n");
+}
+
+static void InvalidateVolumeKeys (EXTENSION *Extension)
+{
+ Dump ("Invalidating volume encryption keys\n");
+
+ Extension->Queue.ThreadBlockReadWrite = TRUE;
+
+ crypto_eraseKeys ((PCRYPTO_INFO) Extension->Queue.CryptoInfo);
+ crypto_eraseKeys ((PCRYPTO_INFO) Extension->cryptoInfo);
+
+ Dump ("Volume encryption keys invalidated!\n");
+}
+
+static void InvalidateDriveFilterKeys (DriveFilterExtension *Extension)
+{
+ Dump ("Invalidating drive filter encryption keys\n");
+ ASSERT (Extension->DriveMounted);
+
+ Extension->Queue.ThreadBlockReadWrite = TRUE;
+
+ crypto_eraseKeys ((PCRYPTO_INFO) Extension->Queue.CryptoInfo);
+ crypto_eraseKeys ((PCRYPTO_INFO) Extension->HeaderCryptoInfo);
+
+ Dump ("Drive filter encryption keys invalidated!\n");
}
static void ComputeBootLoaderFingerprint(PDEVICE_OBJECT LowerDeviceObject, byte* ioBuffer /* ioBuffer must be at least 512 bytes long */)
@@ -1025,6 +1052,36 @@ NTSTATUS DriveFilterDispatchIrp (PDEVICE_OBJECT DeviceObject, PIRP Irp)
return status;
}
+void EmergencyClearAllKeys (PIRP irp, PIO_STACK_LOCATION irpSp)
+{
+ irp->IoStatus.Information = 0;
+
+ if (!IoIsSystemThread (PsGetCurrentThread()) && !UserCanAccessDriveDevice())
+ {
+ irp->IoStatus.Status = STATUS_ACCESS_DENIED;
+ }
+ else
+ {
+ int drive;
+ for (drive = MIN_MOUNTED_VOLUME_DRIVE_NUMBER; drive <= MAX_MOUNTED_VOLUME_DRIVE_NUMBER; ++drive)
+ {
+ PDEVICE_OBJECT device = GetVirtualVolumeDeviceObject (drive);
+ if (device)
+ {
+ PEXTENSION extension = (PEXTENSION) device->DeviceExtension;
+ if (extension)
+ {
+ InvalidateVolumeKeys (extension);
+ }
+ }
+ }
+
+ if (BootDriveFound && BootDriveFilterExtension && BootDriveFilterExtension->DriveMounted)
+ InvalidateDriveFilterKeys (BootDriveFilterExtension);
+
+ irp->IoStatus.Status = STATUS_SUCCESS;
+ }
+}
void ReopenBootVolumeHeader (PIRP irp, PIO_STACK_LOCATION irpSp)
{
diff --git a/src/Driver/DriveFilter.h b/src/Driver/DriveFilter.h
index 9ce151c7..17459cbc 100644
--- a/src/Driver/DriveFilter.h
+++ b/src/Driver/DriveFilter.h
@@ -44,7 +44,7 @@ typedef struct _DriveFilterExtension
KEVENT MountWorkItemCompletedEvent;
- CRYPTO_INFO *HeaderCryptoInfo;
+ volatile CRYPTO_INFO *HeaderCryptoInfo;
BOOL HiddenSystem;
} DriveFilterExtension;
@@ -73,6 +73,7 @@ BOOL IsHiddenSystemRunning ();
NTSTATUS LoadBootArguments ();
static NTSTATUS SaveDriveVolumeHeader (DriveFilterExtension *Extension);
NTSTATUS StartBootEncryptionSetup (PDEVICE_OBJECT DeviceObject, PIRP irp, PIO_STACK_LOCATION irpSp);
+void EmergencyClearAllKeys (PIRP irp, PIO_STACK_LOCATION irpSp);
void ReopenBootVolumeHeader (PIRP irp, PIO_STACK_LOCATION irpSp);
NTSTATUS StartDecoySystemWipe (PDEVICE_OBJECT DeviceObject, PIRP irp, PIO_STACK_LOCATION irpSp);
void StartLegacyHibernationDriverFilter ();
diff --git a/src/Driver/EncryptedIoQueue.c b/src/Driver/EncryptedIoQueue.c
index f7e453fd..6f1d3777 100644
--- a/src/Driver/EncryptedIoQueue.c
+++ b/src/Driver/EncryptedIoQueue.c
@@ -383,7 +383,9 @@ static VOID IoThreadProc (PVOID threadArg)
// Perform IO request if no preceding request of the item failed
if (NT_SUCCESS (request->Item->Status))
{
- if (queue->IsFilterDevice)
+ if (queue->ThreadBlockReadWrite)
+ request->Item->Status = STATUS_DEVICE_BUSY;
+ else if (queue->IsFilterDevice)
{
if (queue->RemapEncryptedArea && request->EncryptedLength > 0)
{
diff --git a/src/Driver/EncryptedIoQueue.h b/src/Driver/EncryptedIoQueue.h
index c4a105e8..58efbc96 100644
--- a/src/Driver/EncryptedIoQueue.h
+++ b/src/Driver/EncryptedIoQueue.h
@@ -44,7 +44,7 @@ typedef struct
KMUTEX BufferPoolMutex;
EncryptedIoQueueBuffer *FirstPoolBuffer;
- CRYPTO_INFO *CryptoInfo;
+ volatile CRYPTO_INFO *CryptoInfo;
// File-handle-based IO
HANDLE HostFileHandle;
@@ -119,6 +119,8 @@ typedef struct
byte* SecRegionData;
SIZE_T SecRegionSize;
+
+ volatile BOOL ThreadBlockReadWrite;
} EncryptedIoQueue;
diff --git a/src/Driver/Ntdriver.c b/src/Driver/Ntdriver.c
index 780db9dc..47b2f8a5 100644
--- a/src/Driver/Ntdriver.c
+++ b/src/Driver/Ntdriver.c
@@ -2507,6 +2507,11 @@ NTSTATUS ProcessMainDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION Ex
}
break;
+ case VC_IOCTL_EMERGENCY_CLEAR_ALL_KEYS:
+ EmergencyClearAllKeys (Irp, irpSp);
+ WipeCache();
+ break;
+
case TC_IOCTL_BOOT_ENCRYPTION_SETUP:
Irp->IoStatus.Status = StartBootEncryptionSetup (DeviceObject, Irp, irpSp);
Irp->IoStatus.Information = 0;
diff --git a/src/Driver/Ntdriver.h b/src/Driver/Ntdriver.h
index 2479d45b..4ee25454 100644
--- a/src/Driver/Ntdriver.h
+++ b/src/Driver/Ntdriver.h
@@ -51,7 +51,7 @@ typedef struct EXTENSION
PFILE_OBJECT pfoDeviceFile; /* Device fileobject for this device */
PDEVICE_OBJECT pFsdDevice; /* lower level device handle */
- CRYPTO_INFO *cryptoInfo; /* Cryptographic and other information for this device */
+ volatile CRYPTO_INFO *cryptoInfo; /* Cryptographic and other information for this device */
__int64 HostLength;
__int64 DiskLength; /* The length of the disk referred to by this device */
@@ -190,6 +190,7 @@ BOOL IsVolumeAccessibleByCurrentUser (PEXTENSION volumeDeviceExtension);
void GetElapsedTimeInit (LARGE_INTEGER *lastPerfCounter);
int64 GetElapsedTime (LARGE_INTEGER *lastPerfCounter);
BOOL IsOSAtLeast (OSVersionEnum reqMinOS);
+PDEVICE_OBJECT GetVirtualVolumeDeviceObject (int driveNumber);
#define TC_BUG_CHECK(status) KeBugCheckEx (SECURITY_SYSTEM, __LINE__, (ULONG_PTR) status, 0, 'VC')