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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.

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This commit is contained in:
Mounir IDRASSI
2019-01-09 00:25:06 +01:00
parent 7c2cf7889f
commit 652e989d23
9 changed files with 87 additions and 6 deletions
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61
src/Driver/DriveFilter.c
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@@ -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)
{