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/*++
Copyright (c) 1997-1999 Microsoft Corporation
Module Name:
efsinit.cxx
Abstract:
EFS (Encrypting File System) Server
Author:
Robert Reichel (RobertRe) July 4, 1997 Robert Gu (RobertGu) Jan 7, 1998
Environment:
Revision History:
--*/#include <lsapch.hxx>
extern "C" {#include <nt.h>
#include <ntdef.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <windows.h>
#include <stdio.h>
#include <efsstruc.h>
#include "lsasrvp.h"
#include "debug.h"
#include "efssrv.hxx"
#include "userkey.h"
#include <cfgmgr32.h>
#include <initguid.h>
#include <mountmgr.h>
#include <Userenv.h>
}
#define TIME_UNIT 10000000 // 1 TIME_UNIT == 1 second
#define CERT_VALID_TIME 86400 // seconds - Default cache length 1 day
//
// Local prototypes of CFGMGR32 functions for dynamic load
//
typedef CMAPI CONFIGRET (WINAPI * CM_GET_DEVICE_INTERFACE_LISTW)( IN LPGUID, IN DEVINSTID_W, OUT PWCHAR, IN ULONG, IN ULONG );
typedef CMAPI CONFIGRET (WINAPI * CM_GET_DEVICE_INTERFACE_LIST_SIZEW)( IN PULONG, IN LPGUID, IN DEVINSTID_W, IN ULONG );
typedef CONFIGRET ( * CMP_WAITSERVICESAVAILABLE)( IN HMACHINE );
//
// Extern Vars
//
extern RTL_RESOURCE RecoveryPolicyResource;extern CURRENT_RECOVERY_POLICY CurrentRecoveryPolicy;extern "C" BOOLEAN EfsDisabled;
//
// Event handle used to sync with the driver
//
HANDLE EfsInitEventHandle = 0;
//
// Efs event handle to get policy change notification
//
HANDLE EfsPolicyEventHandle = 0;HANDLE EfsWaitHandle = 0;EFS_POL_CALLBACK EfsPolCallBack;
BOOLEAN EfsServerInitialized = FALSE;extern "C" BOOLEAN EfsPersonalVer = TRUE;
BOOLEAN EfspInDomain = FALSE;
//
// Cache values
//
HCRYPTPROV hProvVerify = 0;
WCHAR EfsComputerName[MAX_COMPUTERNAME_LENGTH + 1];LIST_ENTRY UserCacheList;RTL_CRITICAL_SECTION GuardCacheListLock;LONG UserCacheListLimit = 5; // We might read this number from the registry in the future
LONG UserCacheListCount = 0;
LONGLONG CACHE_CERT_VALID_TIME;LONG RecoveryCertIsValidating = 0;
static PSID LocalSystemSid;
DWORDInitRecoveryPolicy( VOID );
DWORDSetDefaultRecoveryPolicy( VOID );
DWORDParseRecoveryPolicy_1_1( IN PLSAPR_POLICY_DOMAIN_EFS_INFO PolicyEfsInfo OPTIONAL, OUT PCURRENT_RECOVERY_POLICY ParsedRecoveryPolicy );
VOIDEfsGetRegSettings( VOID );
NTSTATUSEfsServerInit( VOID )/*++
Routine Description:
This routine is called during server initialization to allow EFS to initialize its data structures and inform the EFS Driver that it's up and running.
Arguments:
None.
Return Value:
None.
--*/
{
OBJECT_ATTRIBUTES ObjA; NTSTATUS Status; UNICODE_STRING EfsInitEventName; OSVERSIONINFOEX Osvi; DWORD Result; DWORD nSize = MAX_COMPUTERNAME_LENGTH + 1;
CACHE_CERT_VALID_TIME = (LONGLONG) CERT_VALID_TIME; CACHE_CERT_VALID_TIME *= (LONGLONG) TIME_UNIT;
if ( !GetComputerName ( EfsComputerName, &nSize )){
KdPrint(("EfsServerInit - GetComputerName failed 0x%lx\n", GetLastError())); return STATUS_UNSUCCESSFUL;
}
Osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); if (GetVersionEx((LPOSVERSIONINFO)&Osvi)){
if ((Osvi.wProductType == VER_NT_WORKSTATION) && ( Osvi.wSuiteMask & VER_SUITE_PERSONAL)) {
EfsPersonalVer = TRUE; return STATUS_UNSUCCESSFUL;
} else { EfsPersonalVer = FALSE; }
} else {
//
// Treat as personal
//
EfsPersonalVer = TRUE; return STATUS_UNSUCCESSFUL; }
//
// Init the cache list
//
InitializeListHead(&UserCacheList); Status = RtlInitializeCriticalSection(&GuardCacheListLock); if (!NT_SUCCESS(Status)) { return Status; }
EfsGetRegSettings();
Status = InitDriverSessionKey(); if (!NT_SUCCESS(Status)) {
KdPrint(("EfsServerInit - EFS Init Session Key failed 0x%lx\n", Status)); return( Status );
}
DebugLog((DEB_TRACE_EFS, "In EfsServerInit\n" ));
//
// Zero out the initial recovery policy structure
//
Result = ParseRecoveryPolicy_1_1( NULL, &CurrentRecoveryPolicy );
//
// Determine if we're in a domain or not. This must be done
// before checking the recovery policy.
//
EfspRoleChangeCallback( (POLICY_NOTIFICATION_INFORMATION_CLASS)NULL );
Status = LsaIRegisterPolicyChangeNotificationCallback( &EfspRoleChangeCallback, PolicyNotifyDnsDomainInformation );
//
// Try to get the current recovery policy.
//
__try { RtlInitializeResource( &RecoveryPolicyResource ); } __except (EXCEPTION_EXECUTE_HANDLER) { Status = GetExceptionCode(); } if ( !NT_SUCCESS( Status ) ) { return Status ; }
Result = InitRecoveryPolicy();
if (ERROR_SUCCESS != Result) {
//
// We couldn't initialize our recovery policy. Continue to
// initialize the server so that the driver can proceed.
//
DebugLog((DEB_ERROR, "EfsServerInit - EFS Init Recovery Policy failed 0x%lx\n\n" ,Result )); }
//
// Try to establish connection with the driver.
// Normally, the driver has not been loaded yet. Create
// an event and wait for the driver. If the event already
// exists, signal it.
//
RtlInitUnicodeString( &EfsInitEventName, L"\\EFSInitEvent" );
InitializeObjectAttributes( &ObjA, &EfsInitEventName, 0, NULL, NULL );
Status = NtCreateEvent( &EfsInitEventHandle, EVENT_MODIFY_STATE, &ObjA, NotificationEvent, FALSE );
if (!NT_SUCCESS(Status)) {
if (STATUS_OBJECT_NAME_COLLISION == Status) {
//
// EFS driver has been loaded.
// Open and signal the event. Event handle will be closed
// in GenerateDriverSessionKey()
//
Status = NtOpenEvent( &EfsInitEventHandle, EVENT_MODIFY_STATE, &ObjA );
//
// If the EFS Init event could not be opened, the EFS Server cannot
// synchronize with the EFS Driver so neither component will
// function correctly.
//
if (!NT_SUCCESS(Status)) {
KdPrint(("EfsServerInit - Connection with the driver failed 0x%lx\n",Status)); return( Status );
}
//
// Signal the EFS Init Event. If the signalling fails, the EFS Server
// is not able to synchronize properly with the EFS Driver.
// This is a serious error which prevents both components from
// functioning correctly.
//
Status = NtSetEvent( EfsInitEventHandle, NULL );
if (!NT_SUCCESS(Status)) {
KdPrint(("EfsServerInit - Init Event Set failed 0x%lx\n",Status)); return( Status ); }
} else {
//
// Other unexpected error
//
KdPrint(("EfsServerInit - Event handling failed 0x%lx\n",Status)); return( Status );
} }
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
Status = RtlAllocateAndInitializeSid( &NtAuthority, 1, SECURITY_LOCAL_SYSTEM_RID, 0, 0, 0, 0, 0, 0, 0, &LocalSystemSid );
Status = LsaIRegisterPolicyChangeNotificationCallback( &RecoveryInformationCallback, PolicyNotifyDomainEfsInformation );
//
// Check EFS disable policy if a DC member
//
if (EfspInDomain) {
//
// Only do this if in the domain
//
EfsPolicyEventHandle = CreateEvent(NULL, TRUE, FALSE, NULL); if (EfsPolicyEventHandle) {
HANDLE waitHandle;
EfsPolCallBack.EfsDisable = &EfsDisabled; EfsPolCallBack.EfsPolicyEventHandle = &EfsPolicyEventHandle;
//
// We got the event handle. Let's register it to the GP notification.
// If we can't wait on it, we don't need to register it.
//
if (RegisterGPNotification(EfsPolicyEventHandle, TRUE)){ if (!NT_SUCCESS(RtlRegisterWait( &EfsWaitHandle, EfsPolicyEventHandle, EfsGetPolRegSettings, &EfsPolCallBack, INFINITE, WT_EXECUTEONLYONCE))){ //
// We couldn't use the thread pool.
//
UnregisterGPNotification(EfsPolicyEventHandle);
CloseHandle(EfsPolicyEventHandle); EfsPolicyEventHandle = 0; } } else { //
// We failed to register. No need to wait for the notification.
//
//RtlDeregisterWait(EfsWaitHandle);
CloseHandle(EfsPolicyEventHandle); EfsPolicyEventHandle = 0;
}
}
//
// Now let's read the policy data left by the last session.
// Pass in &EfsDisabled so that later we could easily change this to
// include more features, such as algorithms controlled by the policy.
//
EfsApplyLastPolicy(&EfsDisabled);
} else {
//
// Delete the possible left over key if there is. We may move this to
// DC disjoin later.
//
EfsRemoveKey();
}
EfsServerInitialized = TRUE;
if (NT_SUCCESS( Status )) { DebugLog((DEB_TRACE_EFS, "EFS Server initialized successfully\n" )); } else { DebugLog((DEB_ERROR, "EFS Server Init failed, Status = %x\n" ,Status )); }
return( Status );}
NTSTATUSInitDriverSessionKey( VOID )/*++
Routine Description:
Generates a session key to be used by the driver and the server for sending information back and forth securely.
Arguments:
None.
Return Value:
STATUS_SUCCESS on success, STATUS_UNSUCCESSFUL otherwise.
--*/{ BOOL rc;
//
// hProvVerify will remain open until the process is shut down.
// CryptReleaseContext(hProvVerify, 0) will not be called for this handle.
//
//
if (!CryptAcquireContext(&hProvVerify, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
KdPrint(("InitDriverSessionKey - CryptAcquireContext failed, error = %x\n", GetLastError())); return( STATUS_UNSUCCESSFUL );
}
rc = CryptGenRandom( hProvVerify, SESSION_KEY_SIZE, DriverSessionKey );
if (!rc) { return( STATUS_UNSUCCESSFUL ); } else {
LsaPid = (HANDLE) LongToPtr(GetCurrentProcessId());
deskey( &DesTable, DriverSessionKey );
return( STATUS_SUCCESS ); }}
NTSTATUSGenerateDriverSessionKey( OUT PEFS_INIT_DATAEXG InitDataExg )/*++
Routine Description:
Actually it just sends the pre-created session key back to the caller. The key is generated in InitDriverSessionKey.
Arguments:
InitDataExg - Supplies a pointer to a structure in which to put the initial data to be sent to the driver.
Return Value:
STATUS_SUCCESS.
--*/
{ memcpy( InitDataExg->Key, DriverSessionKey, SESSION_KEY_SIZE ); InitDataExg->LsaProcessID = LsaPid;
if ( EfsInitEventHandle ){
//
// Connection to driver established
//
NtClose( EfsInitEventHandle ); EfsInitEventHandle = 0;
}
return( STATUS_SUCCESS );}
inlineVOIDAcquireRecoveryPolicyWriteLock(){ BOOL b = RtlAcquireResourceExclusive( &RecoveryPolicyResource, TRUE );
ASSERT( b );}
inlineVOIDReleaseRecoveryPolicyWriteLock(){ RtlReleaseResource( &RecoveryPolicyResource );}
DWORDInitRecoveryPolicy( VOID )
/*++
Routine Description:
This routine is used to initialize the current recovery policy.
Arguments:
None
Return Value:
None.
--*/{ //
// Attempt to query the recovery policy
// from LSA, and if there isn't any,
// attempt to create a default set.
//
DWORD Result = ERROR_SUCCESS; PLSAPR_POLICY_DOMAIN_EFS_INFO PolicyEfsInfo = NULL;
NTSTATUS Status = LsarQueryDomainInformationPolicy( LsapPolicyHandle, PolicyDomainEfsInformation, (PLSAPR_POLICY_DOMAIN_INFORMATION *)&PolicyEfsInfo );
if (!NT_SUCCESS( Status )) { return( RtlNtStatusToDosError(Status) ); }
//
// We're going to parse it right into the global that maintains
// the current recovery data, so take the write lock.
//
AcquireRecoveryPolicyWriteLock();
//
// Free the old parsed recovery bits
//
FreeParsedRecoveryPolicy( &CurrentRecoveryPolicy );
Result = ParseRecoveryPolicy_1_1( PolicyEfsInfo, &CurrentRecoveryPolicy );
if (PolicyEfsInfo != NULL) {
LsaIFree_LSAPR_POLICY_DOMAIN_INFORMATION ( PolicyDomainEfsInformation, (PLSAPR_POLICY_DOMAIN_INFORMATION)PolicyEfsInfo ); }
ReleaseRecoveryPolicyWriteLock();
return( Result );}
DWORDParseRecoveryPolicy_1_1( IN PLSAPR_POLICY_DOMAIN_EFS_INFO PolicyEfsInfo OPTIONAL, OUT PCURRENT_RECOVERY_POLICY ParsedRecoveryPolicy )
/*++
Routine Description:
This routine takes the currently defined recovery policy and parses it into a form that can be used conveniently.
Arguments:
PolicyEfsInfo - Optionally supplies a pointer to the current recovery policy from the LSA.
ParsedRecoveryPolicy - Returns a structure containing recovery information in an easy-to-digest format.
Return Value:
return-value - Description of conditions needed to return value. - or - None.
--*/
{ //
// Fill in the contents of the ParsedRecoveryPolicy structure
// with the contents of the passed policy information.
//
PRECOVERY_POLICY_1_1 RecoveryPolicy; DWORD Found = 0; PRECOVERY_KEY_1_1 RecoveryKey; DWORD rc = ERROR_SUCCESS; BOOL b = FALSE;
if (PolicyEfsInfo == NULL) {
//
// NULL recovery policy
//
ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_NULL; goto NoPolicy1; }
RecoveryPolicy = (PRECOVERY_POLICY_1_1)PolicyEfsInfo->EfsBlob;
if (RecoveryPolicy == NULL) {
//
// Empty recovery policy
//
ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_EMPTY; goto NoPolicy1; }
ParsedRecoveryPolicy->dwKeyCount = RecoveryPolicy->RecoveryPolicyHeader.RecoveryKeyCount;
if (ParsedRecoveryPolicy->dwKeyCount == 0) { ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_NO_AGENT; goto NoPolicy1; }
__try {
//
// Scan the recovery data looking for recovery keys in a format we understand
//
ULONG i; RecoveryKey = (PRECOVERY_KEY_1_1) &(RecoveryPolicy->RecoveryKeyList[0]);
for (i=0 ; i< (ParsedRecoveryPolicy->dwKeyCount) ; i++) {
PEFS_PUBLIC_KEY_INFO PublicKeyInfo = &RecoveryKey->PublicKeyInfo;
if (* ((ULONG UNALIGNED *) &(PublicKeyInfo->KeySourceTag)) == EfsCertificate) { Found++; }
RecoveryKey = (PRECOVERY_KEY_1_1)( ((PBYTE)RecoveryKey) + * ((ULONG UNALIGNED *) &(RecoveryKey->TotalLength)) ); }
if (0 == Found) {
ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_BAD_POLICY; goto NoPolicy1;
} else {
ParsedRecoveryPolicy->Base = (PBYTE)LsapAllocateLsaHeap( 7 * sizeof( PVOID ) * Found );
if (ParsedRecoveryPolicy->Base) {
ZeroMemory( ParsedRecoveryPolicy->Base, 7 * sizeof( PVOID ) * Found);
PBYTE Base = ParsedRecoveryPolicy->Base;
ParsedRecoveryPolicy->pbHash = (PBYTE *)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->cbHash = (PDWORD)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->pbPublicKeys = (PBYTE *)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->cbPublicKeys = (PDWORD)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->lpDisplayInfo = (LPWSTR *)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->pCertContext = (PCCERT_CONTEXT *)Base; Base += Found * sizeof(PVOID);
ParsedRecoveryPolicy->pSid = (PSID *)Base; } else {
ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_NO_MEMORY; return( ERROR_NOT_ENOUGH_MEMORY ); }
ParsedRecoveryPolicy->dwKeyCount = Found; ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_OK;
//
// Make a copy of the policy information so we can free what we were passed in the caller
//
RecoveryKey = (PRECOVERY_KEY_1_1) &(RecoveryPolicy->RecoveryKeyList[0]);
for (i=0 ; i< (ParsedRecoveryPolicy->dwKeyCount) ; i++) {
PEFS_PUBLIC_KEY_INFO PublicKeyInfo = &RecoveryKey->PublicKeyInfo;
if (* ((ULONG UNALIGNED *) &(PublicKeyInfo->KeySourceTag)) == EfsCertificate) {
b = ParseRecoveryCertificate( PublicKeyInfo, &ParsedRecoveryPolicy->pbHash[i], &ParsedRecoveryPolicy->cbHash[i], &ParsedRecoveryPolicy->pbPublicKeys[i], &ParsedRecoveryPolicy->cbPublicKeys[i], &ParsedRecoveryPolicy->lpDisplayInfo[i], &ParsedRecoveryPolicy->pCertContext[i], &ParsedRecoveryPolicy->pSid[i] );
if (!b) { break; } }
RecoveryKey = (PRECOVERY_KEY_1_1)( ((PBYTE)RecoveryKey) + * ((ULONG UNALIGNED *) &(RecoveryKey->TotalLength)) ); } }
} __except (EXCEPTION_EXECUTE_HANDLER) {
b = FALSE;
//
// There was something wrong with the recovery policy.
// Return this so we can at least print out an error.
//
rc = GetExceptionCode(); }
if (!b) {
//
// Something failed, clean up
//
rc = GetLastError(); FreeParsedRecoveryPolicy( ParsedRecoveryPolicy ); ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_UNKNOWN_BAD;
DebugLog((DEB_WARN, "Error parsing recovery policy\n" )); }
//
// Policy refreshed. The Cert validation needs to be refreshed.
//
ParsedRecoveryPolicy->CertValidated = CERT_NOT_VALIDATED;
return( rc );
NoPolicy1:
ParsedRecoveryPolicy->dwKeyCount = 0; ParsedRecoveryPolicy->TimeStamp.QuadPart = 0; ParsedRecoveryPolicy->CertValidated = CERT_NOT_VALIDATED; ParsedRecoveryPolicy->Base = NULL; ParsedRecoveryPolicy->pbHash = NULL; ParsedRecoveryPolicy->cbHash = NULL; ParsedRecoveryPolicy->pbPublicKeys = NULL; ParsedRecoveryPolicy->cbPublicKeys = NULL; ParsedRecoveryPolicy->lpDisplayInfo = NULL; ParsedRecoveryPolicy->pCertContext = NULL; ParsedRecoveryPolicy->pSid = NULL;
return( ERROR_SUCCESS );}
VOIDFreeParsedRecoveryPolicy( PCURRENT_RECOVERY_POLICY ParsedRecoveryPolicy )/*++
Routine Description:
This routine will free the allocated memory in a CURRENT_RECOVERY_POLICY structure.
Arguments:
ParsedRecoveryPolicy - Supplies a structure that has had data parsed into it.
Return Value:
None.
--*/
{ //
// Walk through the recovery policy and free everything
//
DWORD i;
if (ParsedRecoveryPolicy->Base) {
for (i=0; i<ParsedRecoveryPolicy->dwKeyCount; i++) {
if (ParsedRecoveryPolicy->pbHash[i] != NULL) { LsapFreeLsaHeap( ParsedRecoveryPolicy->pbHash[i] ); }
if (ParsedRecoveryPolicy->pbPublicKeys[i] != NULL) { LsapFreeLsaHeap( ParsedRecoveryPolicy->pbPublicKeys[i] ); }
if (ParsedRecoveryPolicy->lpDisplayInfo[i] != NULL) { LsapFreeLsaHeap( ParsedRecoveryPolicy->lpDisplayInfo[i] ); }
if (ParsedRecoveryPolicy->pCertContext[i] != NULL) { CertFreeCertificateContext( ParsedRecoveryPolicy->pCertContext[i] ); }
if (ParsedRecoveryPolicy->pSid[i] != NULL) { LsapFreeLsaHeap( ParsedRecoveryPolicy->pSid[i] ); } }
LsapFreeLsaHeap( ParsedRecoveryPolicy->Base ); }
//
// Paranoia
//
ParsedRecoveryPolicy->Base = NULL; ParsedRecoveryPolicy->CertValidated = CERT_NOT_VALIDATED; ParsedRecoveryPolicy->PolicyStatus = RECOVERY_POLICY_NULL; ParsedRecoveryPolicy->dwKeyCount = 0; ParsedRecoveryPolicy->pbHash = NULL; ParsedRecoveryPolicy->cbHash = NULL; ParsedRecoveryPolicy->pbPublicKeys = NULL; ParsedRecoveryPolicy->cbPublicKeys = NULL; ParsedRecoveryPolicy->lpDisplayInfo = NULL; ParsedRecoveryPolicy->pCertContext = NULL; ParsedRecoveryPolicy->pSid = NULL;}
DWORD WINAPIEFSRecover( IN LPVOID Param )/*++
Routine Description:
Enumerate the volumes and do the possible recovery jobs caused by power outage or crash during encryption or decryption.
Arguments:
Param -- Standard parameter for thread. Not used.
Return Value:
Operation result.
--*/{ CONFIGRET RetCode; WCHAR *VolBuffer; WCHAR *PathName; ULONG VolOffset; ULONG bufLen; HMODULE hCfgMgr ; CMP_WAITSERVICESAVAILABLE pCMP_WaitServicesAvailable ; CM_GET_DEVICE_INTERFACE_LIST_SIZEW pCM_Get_Device_Interface_List_Size ; CM_GET_DEVICE_INTERFACE_LISTW pCM_Get_Device_Interface_List ;
// hCfgMgr = LoadLibrary( TEXT("cfgmgr32.dll" ) );
hCfgMgr = LoadLibrary( TEXT("setupapi.dll" ) );
if ( hCfgMgr ) { pCMP_WaitServicesAvailable = (CMP_WAITSERVICESAVAILABLE) GetProcAddress( hCfgMgr, "CMP_WaitServicesAvailable" ); pCM_Get_Device_Interface_List_Size = (CM_GET_DEVICE_INTERFACE_LIST_SIZEW) GetProcAddress( hCfgMgr, "CM_Get_Device_Interface_List_SizeW" );
pCM_Get_Device_Interface_List = (CM_GET_DEVICE_INTERFACE_LISTW) GetProcAddress( hCfgMgr, "CM_Get_Device_Interface_ListW" );
if ( (!pCMP_WaitServicesAvailable) || (!pCM_Get_Device_Interface_List_Size) || (!pCM_Get_Device_Interface_List) ) { FreeLibrary( hCfgMgr );
return GetLastError() ; } } else { return GetLastError() ; }
RetCode = pCMP_WaitServicesAvailable( NULL );
if ( CR_SUCCESS != RetCode ){ FreeLibrary( hCfgMgr ); return RetCode; }
RetCode = pCM_Get_Device_Interface_List_Size( &bufLen, (LPGUID)&MOUNTDEV_MOUNTED_DEVICE_GUID, NULL, CM_GET_DEVICE_INTERFACE_LIST_PRESENT );
if ( CR_SUCCESS == RetCode ){
VolBuffer = (WCHAR *) LsapAllocateLsaHeap( bufLen * sizeof(WCHAR) ); PathName = (WCHAR *) LsapAllocateLsaHeap( MAX_PATH_LENGTH );
if ( (NULL != VolBuffer) && (NULL != PathName) ){
RetCode = pCM_Get_Device_Interface_List( (LPGUID)&MOUNTDEV_MOUNTED_DEVICE_GUID, NULL, VolBuffer, bufLen, CM_GET_DEVICE_INTERFACE_LIST_PRESENT );
if ( CR_SUCCESS == RetCode ){
VolOffset = 0; while (*(VolBuffer + VolOffset)) {
//
// See if recovery is needed on the volume
//
wcscpy(PathName, VolBuffer + VolOffset); wcscat(PathName, EFSDIR); TryRecoverVol(VolBuffer + VolOffset, PathName); while (*(VolBuffer + VolOffset++));
} } else {
HANDLE EventHandleLog = RegisterEventSource( NULL, EFSSOURCE );
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_GET_VOLUMES_ERROR, NULL, 0, 4, NULL, &RetCode ); DeregisterEventSource( EventHandleLog );
}
if ( CR_REGISTRY_ERROR == RetCode ){
//
// Map CR error to winerror
//
RetCode = ERROR_REGISTRY_CORRUPT;
} }
LsapFreeLsaHeap( VolBuffer ); LsapFreeLsaHeap( PathName );
} else {
if ( NULL != PathName ){ LsapFreeLsaHeap( PathName ); }
if ( NULL != VolBuffer ) { LsapFreeLsaHeap( VolBuffer ); }
RetCode = ERROR_NOT_ENOUGH_MEMORY;
} } else {
DWORD RetCode1 = GetLastError(); HANDLE EventHandleLog = RegisterEventSource( NULL, EFSSOURCE );
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_PNP_NOT_READY, NULL, 0, 4, NULL, &RetCode1 ); DeregisterEventSource( EventHandleLog );
}
if ( CR_REGISTRY_ERROR == RetCode1 ){
//
// Map CR error to winerror
//
RetCode = ERROR_REGISTRY_CORRUPT;
} }
FreeLibrary( hCfgMgr );
return RetCode;}
voidTryRecoverVol( IN const WCHAR *VolumeName, IN WCHAR *CacheDir )/*++
Routine Description:
Do the possible recovery jobs caused by power outage or crash during encryption or decryption on the volume.
Arguments:
VolumeName -- volume name to be checked.
CacheDir -- EFSCACHE dir. The buffer can be used in this routine.
Return Value:
None.
--*/{ HANDLE EfsCacheDir; LPWIN32_FIND_DATA FindFileInfo; HANDLE FindHandle;
//
// Check if the directory EFSCACHE exist or not
//
EfsCacheDir = CreateFile( CacheDir, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0 );
if (EfsCacheDir == INVALID_HANDLE_VALUE){ //
// No recovery needed
//
return; }
CloseHandle(EfsCacheDir);
//
// Search the possible log file
//
FindFileInfo = ( LPWIN32_FIND_DATA ) LsapAllocateLsaHeap ( sizeof ( WIN32_FIND_DATA ));
ASSERT( FindFileInfo ); if ( NULL == FindFileInfo ){
return;
}
wcscat(CacheDir, EFSLOGPATTERN);
FindHandle = FindFirstFile( CacheDir, FindFileInfo );
if (FindHandle == INVALID_HANDLE_VALUE){ //
// No LogFile found. No recovery needed
//
LsapFreeLsaHeap( FindFileInfo); return; }
//
// Log file found. FT procedure begins
//
HANDLE EventHandleLog = RegisterEventSource( NULL, EFSSOURCE );
if ( EventHandleLog ){
//
// Error in handling Event Log should not prevent real FT job.
//
ReportEvent( EventHandleLog, EVENTLOG_INFORMATION_TYPE, 0, EFS_FT_STARTED, NULL, 0, 0, NULL, NULL ); }
for (;;){
BOOL b;
TryRecoverFile( VolumeName, FindFileInfo, EventHandleLog );
b = FindNextFile( FindHandle, FindFileInfo ); if ( !b ) { break; } }
if ( EventHandleLog ){ DeregisterEventSource( EventHandleLog ); } LsapFreeLsaHeap( FindFileInfo); FindClose( FindHandle ); return;
}
voidTryRecoverFile( IN const WCHAR *VolumeName, IN LPWIN32_FIND_DATA FindFileInfo, IN HANDLE EventHandleLog )/*++
Routine Description:
Do the possible recovery jobs caused by power outage or crash during encryption or decryption for the file.
Arguments:
VolumeName -- volume name the log file is in.
FindFileInfo -- Information about this log file.
Return Value:
None.
--*/{
WCHAR *FileName; HANDLE LogFile; HANDLE TmpFile; HANDLE Target; HANDLE VolumeHandle; LPWSTR TargetName; LPWSTR TmpName = NULL; LOGHEADER FileHeader; ULONG SectorSize; BYTE *ReadBuffer; BYTE *StatusBuffer; BOOL b; ULONG BufferSize; DWORD BytesRead; ULONG CheckSum; EFS_ACTION_STATUS Action; NTSTATUS Status; UNICODE_STRING FileId;
VolumeHandle = CreateFile( VolumeName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0 );
if ( INVALID_HANDLE_VALUE == VolumeHandle ){
//
// Directory on this volume opened successfully. It is unlikely that we will
// come here.
//
return; }
FileName = (WCHAR *) LsapAllocateLsaHeap( MAX_PATH_LENGTH );
//
// Out of memory is unlikely at the boot time
//
ASSERT (FileName); if ( NULL == FileName ){ CloseHandle( VolumeHandle ); return; }
//
// Construct the log file name
//
wcscpy( FileName, VolumeName ); wcscat( FileName, EFSDIR ); wcscat( FileName, L"\\"); wcscat( FileName, FindFileInfo->cFileName);
LogFile = CreateFile( FileName, GENERIC_READ | GENERIC_WRITE | DELETE, 0, NULL, OPEN_EXISTING, 0, 0 );
if ( INVALID_HANDLE_VALUE == LogFile ){
DWORD ErrCode = GetLastError();
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_OPEN_LOGFILE_ERROR, NULL, 0, 4, NULL, &ErrCode ); }
CloseHandle( VolumeHandle ); LsapFreeLsaHeap(FileName); return;
}
b = ReadFile( LogFile, &FileHeader, sizeof( LOGHEADER ), &BytesRead, NULL );
if ( !b ){
//
// File IO error
//
DWORD ErrCode = GetLastError();
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_READ_LOGFILE_ERROR, NULL, 0, 4, NULL, &ErrCode ); }
CloseHandle( LogFile ); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(FileName); return;
}
if ( 0 == BytesRead ){
//
// Zero length log file. Nothing started. Delete it.
//
MarkFileForDelete( LogFile ); CloseHandle( LogFile ); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(FileName); return;
}
if ( (BytesRead < sizeof( LOGHEADER )) || (LOGSIGLEN * sizeof (WCHAR) != RtlCompareMemory( &(FileHeader.SIGNATURE[0]), LOGSIG, LOGSIGLEN * sizeof (WCHAR) )) || ( LOGVERID != FileHeader.VerID )){ //
// Probably not our log file
//
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_INFORMATION_TYPE, 0, EFS_LOGFILE_FORMAT_ERROR, NULL, 0, 0, NULL, NULL ); }
CloseHandle( LogFile ); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(FileName); return;
}
//
// Read in the whole header to continue the process
//
SectorSize = FileHeader.SectorSize; BufferSize = FileHeader.HeaderBlockSize;
ASSERT( BufferSize % SectorSize == 0 );
ReadBuffer = (BYTE *) LsapAllocateLsaHeap( BufferSize );
//
// StatusBuffer must be aligned for cached IO.
// LsapAllocateLsaHeap() is not aligned.
//
if ((FileHeader.Flag & LOG_DIRECTORY) == 0) { StatusBuffer = (BYTE *) VirtualAlloc( NULL, FileHeader.OffsetStatus2 - FileHeader.OffsetStatus1, MEM_COMMIT, PAGE_READWRITE ); } else { StatusBuffer = NULL; }
ASSERT( (FileHeader.OffsetStatus2 - FileHeader.OffsetStatus1) % SectorSize == 0 ); ASSERT( ReadBuffer ); if ( (NULL == ReadBuffer) || ((NULL == StatusBuffer) && ((FileHeader.Flag & LOG_DIRECTORY) == 0)) ){
//
// Out of memory is almost impossible during the boot time.
//
if ( ReadBuffer ) { LsapFreeLsaHeap(ReadBuffer); } if ( StatusBuffer ) { VirtualFree( StatusBuffer, 0, MEM_RELEASE ); } CloseHandle( LogFile ); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(FileName); return; }
SetFilePointer( LogFile, 0, NULL, FILE_BEGIN);
b = ReadFile( LogFile, ReadBuffer, BufferSize, &BytesRead, NULL );
if ( !b || ( BytesRead != BufferSize ) ){
//
// File IO error, Should sent out some debug Info?
//
DWORD ErrCode = GetLastError();
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_READ_LOGFILE_ERROR, NULL, 0, 4, NULL, &ErrCode ); }
CloseHandle( LogFile ); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(ReadBuffer); VirtualFree( StatusBuffer, 0, MEM_RELEASE ); LsapFreeLsaHeap(FileName); return;
}
CheckSum = GetCheckSum(ReadBuffer, FileHeader.HeaderSize ); if (CheckSum == *(ULONG* ) (ReadBuffer + BufferSize - sizeof(ULONG))){
OBJECT_ATTRIBUTES Obja; IO_STATUS_BLOCK IoStatusBlock;
//
// The header is in good condition. Get TargetName and TmpName for the error
// msg in system log.
//
TargetName = (WCHAR *)( ReadBuffer + FileHeader.TargetFilePathOffset );
if ( (FileHeader.Flag & LOG_DIRECTORY) == 0 ){
//
// Operation was on File not on Directory
// The real status is in Status block. Read in the status block.
// Log file may updated. We need to reopen it with non-cached IO.
//
CloseHandle( LogFile ); LogFile = CreateFile( FileName, GENERIC_READ | GENERIC_WRITE | DELETE, 0, NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, 0 );
//
// Log File name is done. We are going to use FileName memory space
// to get a temp file name.
//
if ( INVALID_HANDLE_VALUE == LogFile ){
//
// Log File cannot be open as non-cached IO. Try next time.
// This is weird.
//
DWORD ErrCode = GetLastError();
ASSERT (FALSE);
if ( EventHandleLog ){ ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_OPEN_LOGFILE_NC_ERROR, NULL, 0, 4, NULL, &ErrCode ); } LsapFreeLsaHeap(FileName); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(ReadBuffer); VirtualFree( StatusBuffer, 0, MEM_RELEASE ); return;
}
//
// Open the temp file first.
//
TmpName = (WCHAR *)( ReadBuffer + FileHeader.TempFilePathOffset ); FileId.Buffer = (WCHAR *) &(FileHeader.TempFileInternalName); FileId.Length = FileId.MaximumLength = sizeof (LARGE_INTEGER); InitializeObjectAttributes( &Obja, &FileId, 0, VolumeHandle, NULL );
Status = NtCreateFile( &TmpFile, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, &Obja, &IoStatusBlock, NULL, 0, 0, FILE_OPEN, FILE_OPEN_BY_FILE_ID | FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, 0 );
if (NT_SUCCESS( Status )){
OBJECT_NAME_INFORMATION *ATempFileName; ULONG PathLength;
//
// Temp file opened with File ID. File open by ID cannot be deleted. So
// we need to get a name and reopen it using the name with DELETE
// access
//
ATempFileName = (OBJECT_NAME_INFORMATION *)FileName; Status = NtQueryObject( TmpFile, ObjectNameInformation, ATempFileName, MAX_PATH_LENGTH, &PathLength );
if ( NT_SUCCESS( Status ) ){
CloseHandle(TmpFile); TmpFile = 0; InitializeObjectAttributes( &Obja, &(ATempFileName->Name), 0, 0, NULL );
Status = NtCreateFile( &TmpFile, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE | DELETE, &Obja, &IoStatusBlock, NULL, 0, 0, FILE_OPEN, FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, 0 );
if (!NT_SUCCESS( Status )){
//
// Well, we cannot open with the name got. Strange.
// Reopen it with File ID. Temp file is not going to be deleted.
//
ASSERT(FALSE); if ( EventHandleLog ){
LPWSTR lpStrings[2]; lpStrings[1] = TargetName; lpStrings[0] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_WARNING_TYPE, 0, EFS_TMP_OPEN_NAME_ERROR, NULL, 2, 4, (LPCTSTR *) &lpStrings[0], &Status ); }
InitializeObjectAttributes( &Obja, &FileId, 0, VolumeHandle, NULL );
Status = NtCreateFile( &TmpFile, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, &Obja, &IoStatusBlock, NULL, 0, 0, FILE_OPEN, FILE_OPEN_BY_FILE_ID | FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, 0 );
if (!NT_SUCCESS( Status )){
//
// Well, more strange. We cannot even open the file we opened
// Nothing we can do this time. Try next time.
//
if ( EventHandleLog ){
LPWSTR lpStrings[2]; lpStrings[1] = TargetName; lpStrings[0] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_WARNING_TYPE, 0, EFS_TMP_FILEID_ERROR, NULL, 2, 4, (LPCTSTR*) &lpStrings[0], &Status ); }
LsapFreeLsaHeap(FileName); CloseHandle( VolumeHandle ); LsapFreeLsaHeap(ReadBuffer); VirtualFree( StatusBuffer, 0, MEM_RELEASE ); return;
} } } else {
if ( EventHandleLog ){
LPWSTR lpStrings[2]; lpStrings[0] = TargetName; lpStrings[1] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_WARNING_TYPE, 0, EFS_TMP_FILENAME_ERROR, NULL, 2, 4, (LPCTSTR*) &lpStrings[0], &Status ); }
}
//
// If a name cannot be got, the following apply.
// Temp file is existed. But we cannot get a name. Weird.
// The recover will go on. But the temp file will not be deleted
//
} else {
//
// Temp file is not exist. May be deleted by our operations.
// Make sure the handle is 0.
//
TmpFile = 0; }
//
// FileName is done.
//
LsapFreeLsaHeap(FileName); FileName = NULL;
Status = ReadLogFile( LogFile, StatusBuffer, FileHeader.OffsetStatus1, FileHeader.OffsetStatus2 );
if (!NT_SUCCESS( Status )) {
//
// Status copies are not valid. Nothing have started or we can do nothing
// to recover. Delete the log file.
//
MarkFileForDelete( LogFile ); CloseHandle( LogFile ); if ( TmpFile ){ CloseHandle( TmpFile ); } CloseHandle( VolumeHandle ); LsapFreeLsaHeap(ReadBuffer); VirtualFree( StatusBuffer, 0, MEM_RELEASE ); return;
}
Action = * (EFS_ACTION_STATUS *) (StatusBuffer + sizeof (ULONG));
} else {
//
// Operations were on a directory
//
if ( FileHeader.Flag & LOG_DECRYPTION ){
Action = BeginDecryptDir;
} else {
Action = BeginEncryptDir;
}
TmpFile = 0; }
//
// Open the target file.
//
if (StatusBuffer) { VirtualFree( StatusBuffer, 0, MEM_RELEASE ); }
FileId.Buffer = (WCHAR* ) &(FileHeader.TargetFileInternalName); FileId.Length = FileId.MaximumLength = sizeof (LARGE_INTEGER); InitializeObjectAttributes( &Obja, &FileId, 0, VolumeHandle, NULL );
Status = NtCreateFile( &Target, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE , &Obja, &IoStatusBlock, NULL, 0, 0, FILE_OPEN, FILE_OPEN_BY_FILE_ID | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, 0 );
if (!NT_SUCCESS( Status )) {
//
// OOPS! We can not open the target. What can we do without the target.
// Delete the log file.
//
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_WARNING_TYPE, 0, EFS_TARGET_OPEN_ERROR, NULL, 1, 4, (LPCTSTR*) &TargetName, &Status ); }
MarkFileForDelete( LogFile ); CloseHandle( LogFile ); CloseHandle( VolumeHandle ); if ( TmpFile ){ CloseHandle( TmpFile ); } LsapFreeLsaHeap(ReadBuffer); return;
}
//
// We survived so far. Now is the show time!
//
DoRecover( Target, TmpFile, LogFile, TargetName, TmpName, FileHeader.OffsetStatus2 - FileHeader.OffsetStatus1, FileHeader.OffsetStatus1, Action, EventHandleLog );
CloseHandle ( Target ); if ( TmpFile ){ CloseHandle( TmpFile ); }
} else {
//
// The header is not fully written. Nothing could have be done.
// Just delete the log file and we are done.
//
MarkFileForDelete( LogFile ); if (StatusBuffer) { VirtualFree( StatusBuffer, 0, MEM_RELEASE ); } LsapFreeLsaHeap(FileName); }
LsapFreeLsaHeap(ReadBuffer); CloseHandle( LogFile ); CloseHandle( VolumeHandle ); return;
}
NTSTATUSReadLogFile( IN HANDLE LogFile, OUT BYTE* ReadBuffer, IN ULONG FirstCopy, IN ULONG SecondCopy )/*++
Routine Description:
Read Status Log Information.
Arguments:
LogFile -- A handle to the log file
ReadBuffer -- Buffer for the output data.
FirstCopy -- Offset of first status information copy in the logfile.
SecondCopy -- Offset of second status information copy in the logfile.
Return Value:
The status of operation.--*/{ ULONG ReadBytes; NTSTATUS Status; IO_STATUS_BLOCK IoStatusBlock; LARGE_INTEGER ByteOffset; ULONG CheckSum; BOOLEAN WrongCheckSum = FALSE;
//
// Write out the header sector
//
ByteOffset.QuadPart = (LONGLONG) FirstCopy; ReadBytes = SecondCopy - FirstCopy;
Status = NtReadFile( LogFile, 0, NULL, NULL, &IoStatusBlock, ReadBuffer, ReadBytes, &ByteOffset, NULL );
if ( NT_SUCCESS(Status) ) {
//
// Check the integrity of the data
//
CheckSum = GetCheckSum( ReadBuffer, 2 * sizeof (ULONG) ); if ( CheckSum != *(ULONG *)( ReadBuffer + ReadBytes - sizeof (ULONG) )){
WrongCheckSum = TRUE;
}
}
if ( !NT_SUCCESS(Status) || WrongCheckSum ) {
ByteOffset.QuadPart = (LONGLONG) SecondCopy; Status = NtReadFile( LogFile, 0, NULL, NULL, &IoStatusBlock, ReadBuffer, ReadBytes, &ByteOffset, NULL );
if ( NT_SUCCESS(Status) ) {
//
// Check the integrity of the data
//
CheckSum = GetCheckSum( ReadBuffer, 2 * sizeof (ULONG) ); if ( CheckSum != *(ULONG *)( ReadBuffer + ReadBytes - sizeof (ULONG) )){
//
// Both status copy are bad.
//
Status = STATUS_FILE_CORRUPT_ERROR; } } }
return Status;}
NTSTATUSDoRecover( IN HANDLE Target, IN HANDLE TmpFile OPTIONAL, IN HANDLE LogFile, IN LPCWSTR TargetName, IN LPCWSTR TmpName OPTIONAL, IN ULONG StatusCopySize, IN ULONG StatusStartOffset, IN ULONG Action, IN HANDLE EventHandleLog )/*++
Routine Description:
Do the real dirty recovery job here.
Arguments:
Target -- A handle to the target file or directory.
TmpFile -- A handle to the temp file if Target is a file.
LogFile -- A handle to the log file.
TargetName -- Target file name. This info is used for error log only.
TmpName -- Temp backup file name. This info is used for error log only.
StatusCopySize -- Log file status copy section size.
StatusStartOffset -- Offset of status copy in the log file.
Action -- The status to begin.
EventHandleLog -- Event log handle.
Return Value:
The status of operation.--*/{
NTSTATUS Status = STATUS_SUCCESS; EFSP_OPERATION Operation = EncryptRecovering;
if ( ( BeginEncryptDir == Action ) || ( BeginDecryptDir == Action ) ){
//
// In both cases, we will do Decrypt on the directory
//
Status = DecryptDir( Target, TargetName ); if ( NT_SUCCESS(Status) ) {
//
// The operation was successful
//
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_INFORMATION_TYPE, 0, EFS_TARGET_RECOVERED, NULL, 1, 0, (LPCTSTR*) &TargetName, NULL ); }
MarkFileForDelete( LogFile );
} else {
//
// EFS driver might not be loaded. Log the information.
//
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_DRIVER_MISSING, NULL, 1, 0, (LPCTSTR*) &TargetName, NULL ); } } } else {
//
// File operations
//
switch ( Action ) { case EncryptionMessup:
//
// The original file is messed up due to the unknown reason.
// Operation required,
// Same as EncryptTmpFileWritten.
//
Operation = EncryptRecovering;
// ***** Fall through intended *****
case DecryptTmpFileWritten:
//
// Temp file is created and written during the decryption. The original file is probably
// damaged. Operation required,
// Same as the EncryptTmpFileWritten. The file will end up as plain text.
//
if ( DecryptTmpFileWritten == Action ){ Operation = DecryptRecovering; }
//
// ***** Fall through intended *****
//
case EncryptTmpFileWritten:
if ( EncryptTmpFileWritten == Action ){
Operation = EncryptRecovering;
}
//
// Temp file is created and written during the encryption. The original file is probably
// damaged. Operation required,
// FSCTL decrypt each stream, copy the data back to the original file. Log file
// will be updated to BeginEncryptFile after all the streams are copied back. Then
// continue the case indicated in BeginEncryptFile.
//
if ( !TmpFile ){
//
// Temp backup not existed or open failed, we can do nothing for this.
// Log the error information and quit.
//
if ( EventHandleLog ){
LPCWSTR lpStrings[2]; lpStrings[1] = TargetName; lpStrings[0] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_TMPFILE_MISSING, NULL, 2, 4, &lpStrings[0], &Status ); }
return STATUS_NO_SUCH_FILE; }
Status = RestoreTarget( Target, TmpFile, TargetName, TmpName, EventHandleLog, Operation );
if ( NT_SUCCESS(Status) ) {
WriteLogFile( LogFile, StatusCopySize, StatusStartOffset, BeginEncryptFile );
} else {
return Status;
}
// ***** Fall through intended *****
case DecryptionDone:
//
// All the streams are marked decrypted. The file might still have the flag set.
// Operation required,
// Same as BeginEncryptFile.
//
// ***** Fall through intended *****
case EncryptionBackout:
//
// Encryption failed but we managed the original streams back. The file might
// be in a transition status.
// Operation required,
// Same as BeginEncryptFile.
//
// ***** Fall through intended *****
case BeginEncryptFile:
//
// File encryption just begin. Original file is not changed.
// Operation required,
// Remove the $EFS, remove the tempfile if existed and remove the log file.
//
Status = SendGenFsctl( Target, EFS_DECRYPT_FILE, EFS_DECRYPT_FILE, EFS_SET_ENCRYPT, FSCTL_SET_ENCRYPTION );
if ( NT_SUCCESS(Status) ) {
if ( TmpFile ){ MarkFileForDelete( TmpFile ); } MarkFileForDelete( LogFile );
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_INFORMATION_TYPE, 0, EFS_TARGET_RECOVERED, NULL, 1, 0, &TargetName, NULL ); } } else {
//
// EFS driver may not be loaded. Write the log info.
//
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_DRIVER_MISSING, NULL, 1, 0, &TargetName, NULL ); } }
break;
case BeginDecryptFile:
//
// File decryption just begin. Original file is not changed.
// Operation required,
// Set the transition status to normal, remove the tempfile if existed and
// remove the log file.
//
// ***** Fall through intended *****
case EncryptionDone:
//
// All the streams were encrypted. The original file might be in transition status.
// Operation required,
// FSCTL to set the transition status to normal. Update the log status to
// EncryptionSrcDone. Continue to EncryptionSrcDone.
//
Status = SendGenFsctl( Target, 0, 0, EFS_ENCRYPT_DONE, FSCTL_ENCRYPTION_FSCTL_IO );
if ( !NT_SUCCESS(Status) ) {
//
// EFS driver might not be loaded. Log error.
//
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_DRIVER_MISSING, NULL, 1, 0, &TargetName, NULL ); } return Status;
}
// ***** Fall through intended *****
case EncryptionSrcDone:
//
// The original file is encrypted successfully. The temp file might still be left.
// Operation required,
// Remove the temp file if existed and remove the log file.
//
if ( TmpFile ){ MarkFileForDelete( TmpFile ); } MarkFileForDelete( LogFile );
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_INFORMATION_TYPE, 0, EFS_TARGET_RECOVERED, NULL, 1, 0, &TargetName, NULL ); } break;
default:
//
// Not our log file or tempered by someone.
// Write to the log to notify the user.
//
Status = STATUS_FILE_CORRUPT_ERROR; break; } }
return Status;}
NTSTATUSDecryptDir( IN HANDLE Target, IN LPCWSTR TargetName )/*++
Routine Description:
Decrypt a directory.
Arguments:
Target -- A handle to the target file or directory.
TargetName -- Target file name. This info is used for error log only.
Return Value:
The status of operation.--*/{ NTSTATUS Status = STATUS_SUCCESS;
Status = SendGenFsctl( Target, EFS_DECRYPT_STREAM, EFS_DECRYPT_DIRSTR, EFS_SET_ENCRYPT, FSCTL_SET_ENCRYPTION );
if ( NT_SUCCESS( Status ) ){
Status = SendGenFsctl( Target, EFS_DECRYPT_FILE, EFS_DECRYPT_DIRFILE, EFS_SET_ENCRYPT, FSCTL_SET_ENCRYPTION ); }
return Status;
}
NTSTATUSRestoreTarget( IN HANDLE Target, IN HANDLE TmpFile, IN LPCWSTR TargetName, IN LPCWSTR TmpName, IN HANDLE EventHandleLog, EFSP_OPERATION Operation )/*++
Routine Description:
Copy all the streams in the temp backup file to the original target file.
Arguments:
Target -- A handle to the target file or directory.
TmpFile -- A handle to the temp file if Target is a file.
TargetName -- Target file name. This info is used for error log only.
TmpName -- Temp backup file name. This info is used for error log only.
Operation -- Indicate if encryption or decryption was tried.
Return Value:
The status of operation.--*/{ NTSTATUS Status; DWORD hResult; PFILE_STREAM_INFORMATION StreamInfoBase = NULL; ULONG StreamInfoSize = 0; ULONG StreamCount = 0; PEFS_STREAM_SIZE StreamSizes; PHANDLE StreamHandles; PUNICODE_STRING StreamNames;
Status = GetStreamInformation( TmpFile, &StreamInfoBase, &StreamInfoSize );
if ( NT_SUCCESS( Status ) ){
hResult = OpenFileStreams( TmpFile, FILE_SHARE_DELETE, // have to share with delete-ers, since the main stream is open for delete
OPEN_FOR_FTR, StreamInfoBase, FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE, FILE_OPEN, FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, &StreamNames, // Free this but not the contents!
&StreamHandles, // Free this
&StreamSizes, // Free this
&StreamCount );
if (hResult == ERROR_SUCCESS) {
ULONG FsInputDataSize; PUCHAR FsInputData; PHANDLE TargetStreamHandles; LONG ArrIndex;
TargetStreamHandles = ( PHANDLE ) LsapAllocateLsaHeap(StreamCount * sizeof (HANDLE)); if ( TargetStreamHandles ){
//
// Open streams at the original target file
//
for ( ArrIndex = 0; ArrIndex < (LONG) StreamCount; ArrIndex++){ if ( StreamHandles[ArrIndex] == TmpFile ){ TargetStreamHandles[ArrIndex] = Target; } else { OBJECT_ATTRIBUTES Obja; IO_STATUS_BLOCK IoStatusBlock;
InitializeObjectAttributes( &Obja, &StreamNames[ArrIndex], 0, Target, NULL );
Status = NtCreateFile( &TargetStreamHandles[ArrIndex], GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, &Obja, &IoStatusBlock, NULL, 0, 0, FILE_OPEN_IF, FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT, NULL, 0 ); if (!NT_SUCCESS( Status )){
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_TARGET_STREAM_OPEN_ERROR, NULL, 1, 4, &TargetName, &Status ); }
break; } } }
if ( NT_SUCCESS( Status ) ){
//
// Adjust ArrIndex for clean up
//
ArrIndex--;
//
// Make a FSCTL request input data block
//
FsInputDataSize = 7 * sizeof( ULONG ) + 2 * sizeof(DriverSessionKey); FsInputData = (PUCHAR) LsapAllocateLsaHeap(FsInputDataSize);
if ( FsInputData ){
BOOLEAN CleanupSuccessful;
( VOID )GetDecryptFsInput( Target, FsInputData, &FsInputDataSize );
hResult = CopyFileStreams( StreamHandles, // handles to streams on the backup file
TargetStreamHandles, // Handles to the streams on the original file
StreamCount, // number of streams
StreamSizes, // sizes of streams
Operation, // mark StreamHandles as Decrypted before copy
FsInputData, // FSCTL input data
FsInputDataSize, // FSCTL input data size
&CleanupSuccessful );
LsapFreeLsaHeap( FsInputData );
if ( hResult != ERROR_SUCCESS ){
if ( EventHandleLog ){
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_STREAM_COPY_ERROR, NULL, 1, 4, &TargetName, &hResult ); }
Status = STATUS_UNSUCCESSFUL; } } else {
//
// Out of memory. Almost impossible during LSA init.
//
ASSERT(FALSE); Status = STATUS_INSUFFICIENT_RESOURCES; } }
//
// Clean up TargetStreamHandles at the target.
//
while (ArrIndex >= 0){ if ( TargetStreamHandles[ArrIndex] != Target ){ CloseHandle(TargetStreamHandles[ArrIndex]); } ArrIndex--; } LsapFreeLsaHeap( TargetStreamHandles );
}
//
// Clean up StreamHandles and etc.
//
for (ArrIndex = 0; ArrIndex< (LONG) StreamCount ; ArrIndex++) { if ( StreamHandles[ArrIndex] != TmpFile){ NtClose( StreamHandles[ArrIndex] ); } }
LsapFreeLsaHeap( StreamHandles); LsapFreeLsaHeap( StreamNames); LsapFreeLsaHeap( StreamSizes);
} else {
//
// Not all the requested streams could be opened.
// Write the log info.
//
if ( EventHandleLog ){
LPCWSTR lpStrings[2]; lpStrings[1] = TargetName; lpStrings[0] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_TMP_STREAM_OPEN_ERROR, NULL, 2, 4, &lpStrings[0], &hResult ); }
Status = STATUS_UNSUCCESSFUL; }
LsapFreeLsaHeap( StreamInfoBase );
} else {
//
// Stream info cannot be got. Write LOG info.
//
if ( EventHandleLog ){
LPCWSTR lpStrings[2]; lpStrings[1] = TargetName; lpStrings[0] = TmpName;
ReportEvent( EventHandleLog, EVENTLOG_ERROR_TYPE, 0, EFS_TMP_STREAM_INFO_ERROR, NULL, 2, 4, &lpStrings[0], &Status ); }
}
return Status;}
BOOLParseRecoveryCertificate( IN PEFS_PUBLIC_KEY_INFO pPublicKeyInfo, OUT PBYTE * pbHash, OUT PDWORD cbHash, OUT PBYTE * pbPublicKey, OUT PDWORD cbPublicKey, OUT LPWSTR * lpDisplayInfo, OUT PCCERT_CONTEXT * pCertContext, OUT PSID * pSid )
/*++
Routine Description:
This routine takes a certificate passed in the recovery policy and extracts the interesting information.
Arguments:
pPublicKeyInfo - Takes the public key info structure from the recovery policy.
pbHash - Returns the hash of the passed certificate.
cbHash - Returns the lengh in bytes of the returned hash.
pbPublicKey - Returns a pointer to the public key blob of the certificate.
cbPublicKey - Returns the length in bytes of the public key.
lpDisplayInfo - Returns display information about the certificate.
pCertContext - Cert context for the passed certificate.
pSid - Returns SID of the recovery agent
Return Value:
TRUE on success, FALSE on failure. Call GetLastError() for more details.
--*/
{ //
// Get the certificate out of the public key info structure
//
PEFS_PUBLIC_KEY_INFO pAlignedPublicKeyInfo; BOOLEAN freeAlignedInfo; DWORD rc = ERROR_SUCCESS;
rc = EfsAlignBlock( pPublicKeyInfo, (PVOID *)&pAlignedPublicKeyInfo, &freeAlignedInfo ); if (!pAlignedPublicKeyInfo) {
//
// OOM. Treat it as not current.
//
rc = ERROR_NOT_ENOUGH_MEMORY; return FALSE;
}
ASSERT( pAlignedPublicKeyInfo->KeySourceTag == EfsCertificate );
//
// Initialize OUT parameters
//
*pbHash = NULL; *pbPublicKey = NULL; *lpDisplayInfo = NULL; *pCertContext = NULL; *pSid = NULL;
PBYTE pbCert = (PBYTE)OFFSET_TO_POINTER(CertificateInfo.Certificate, pAlignedPublicKeyInfo); DWORD cbCert = pAlignedPublicKeyInfo->CertificateInfo.CertificateLength;
*pCertContext = CertCreateCertificateContext( CRYPT_ASN_ENCODING, (const PBYTE)pbCert, cbCert);
if (*pCertContext) {
PCERT_INFO pCertInfo = (*pCertContext)->pCertInfo; CERT_PUBLIC_KEY_INFO * pSubjectPublicKeyInfo = &pCertInfo->SubjectPublicKeyInfo; CRYPT_BIT_BLOB * PublicKey = &pSubjectPublicKeyInfo->PublicKey;
*cbPublicKey = 0;
if (CryptDecodeObject( CRYPT_ASN_ENCODING, RSA_CSP_PUBLICKEYBLOB, PublicKey->pbData, PublicKey->cbData, 0, NULL, cbPublicKey )) {
if (*pbPublicKey = (PBYTE)LsapAllocateLsaHeap( *cbPublicKey )) {
if (CryptDecodeObject( CRYPT_ASN_ENCODING, RSA_CSP_PUBLICKEYBLOB, PublicKey->pbData, PublicKey->cbData, 0, *pbPublicKey, cbPublicKey )) {
//
// Get the certificate hash
//
*cbHash = 0;
if (CertGetCertificateContextProperty( *pCertContext, CERT_HASH_PROP_ID, NULL, cbHash )) {
*pbHash = (PBYTE)LsapAllocateLsaHeap( *cbHash );
if (*pbHash) {
if (CertGetCertificateContextProperty( *pCertContext, CERT_HASH_PROP_ID, *pbHash, cbHash )) {
//
// Get the display information
//
*lpDisplayInfo = EfspGetCertDisplayInformation( *pCertContext );
if (*lpDisplayInfo == NULL) {
rc = GetLastError(); }
//
// Try to get the recovery agent SID
// This info is not very important. If we fail, we should continue.
//
if (pAlignedPublicKeyInfo->PossibleKeyOwner) {
DWORD SidLength; PSID RecSid = (PSID) OFFSET_TO_POINTER( PossibleKeyOwner, pAlignedPublicKeyInfo );
SidLength = GetLengthSid(RecSid); *pSid = (PSID)LsapAllocateLsaHeap( SidLength ); if (*pSid) { RtlCopyMemory( *pSid, RecSid, SidLength ); } }
} else {
rc = GetLastError(); }
} else {
rc = ERROR_NOT_ENOUGH_MEMORY; }
} else {
rc = GetLastError(); }
} else {
rc = GetLastError(); }
} else {
rc = ERROR_NOT_ENOUGH_MEMORY; }
} else {
rc = GetLastError(); }
} else {
rc = GetLastError(); }
if (freeAlignedInfo) { LsapFreeLsaHeap( pAlignedPublicKeyInfo ); }
if (rc != ERROR_SUCCESS) {
//
// Free the stuff we were going to return
//
if (*pbHash != NULL) { LsapFreeLsaHeap( *pbHash ); *pbHash = NULL; }
if (*pbPublicKey != NULL) { LsapFreeLsaHeap( *pbPublicKey ); *pbPublicKey = NULL; }
if (*lpDisplayInfo != NULL) { LsapFreeLsaHeap( *lpDisplayInfo ); *lpDisplayInfo = NULL; }
if (*pCertContext != NULL) { CertFreeCertificateContext( *pCertContext ); *pCertContext = NULL; }
if (*pSid != NULL) { LsapFreeLsaHeap( *pSid ); *pSid = NULL; } }
SetLastError( rc );
return( rc == ERROR_SUCCESS );}
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