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783 lines
22 KiB
783 lines
22 KiB
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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opcache.cxx
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Abstract:
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Routines implementing a cache of which operations have already been checked
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for a particular client context
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Author:
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Cliff Van Dyke (cliffv) 14-Nov-2001
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--*/
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#include "pch.hxx"
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#define AZD_COMPONENT AZD_ACCESS
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//
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// Windows XP RTM doesn't support RtlLookupElementGenericTableFull
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// Windoes XP SP1 does support it
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// So avoid the API if building a binary that runs on XP RTM.
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#ifndef RUN_ON_XP_RTM
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#define USE_AVL_FULL 1
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#endif // RUN_ON_XP_RTM
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//
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// Structure describing the operations that have previously had access checks done on them
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// for a particular scope.
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//
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typedef struct _AZP_OPERATION_CACHE {
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//
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// Pointer to the scope object this cache entry applies to
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// The ReferenceCount is held on Scope.
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// This value is NULL if the scope is the application.
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//
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PAZP_SCOPE Scope;
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//
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// Pointer to the operation object this cache entry applies to
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// The ReferenceCount is held on Operation
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// This field must be the first field in the structure.
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//
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PAZP_OPERATION Operation;
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//
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// Pointer to the business rule string applicable to this operation
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// The actual string is a part of this same allocated buffer.
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AZP_STRING BizRuleString;
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//
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// Result of the access check
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//
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DWORD Result;
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} AZP_OPERATION_CACHE, *PAZP_OPERATION_CACHE;
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RTL_GENERIC_COMPARE_RESULTS
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AzpAvlCacheCompare(
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IN PRTL_GENERIC_TABLE Table,
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IN PVOID FirstStruct,
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IN PVOID SecondStruct
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)
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/*++
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Routine Description:
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This routine will compare twp operation cache entries
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Arguments:
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IN PRTL_GENERIC_TABLE - Supplies the table containing the announcements
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IN PVOID FirstStuct - The first structure to compare.
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IN PVOID SecondStruct - The second structure to compare.
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Return Value:
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Result of the comparison.
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--*/
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{
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PAZP_OPERATION_CACHE Op1 = (PAZP_OPERATION_CACHE) FirstStruct;
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PAZP_OPERATION_CACHE Op2 = (PAZP_OPERATION_CACHE) SecondStruct;
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if ( Op1->Scope < Op2->Scope ) {
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return GenericLessThan;
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} else if ( Op1->Scope > Op2->Scope ) {
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return GenericGreaterThan;
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} else if ( Op1->Operation < Op2->Operation ) {
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return GenericLessThan;
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} else if ( Op1->Operation > Op2->Operation ) {
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return GenericGreaterThan;
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} else {
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return GenericEqual;
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}
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UNREFERENCED_PARAMETER(Table);
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}
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VOID
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AzpInitOperationCache(
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IN PAZP_CLIENT_CONTEXT ClientContext
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)
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/*++
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Routine Description:
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Initializes the operation cache for a client context
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On entry, AzGlResource must be locked exclusively.
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Arguments:
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ClientContext - Specifies the client context to initialize the cache for
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Return Value:
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None
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--*/
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{
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//
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// Initialization
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//
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ASSERT( AzpIsLockedExclusive( &AzGlResource ) );
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//
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// Initialize the AVL tree of scopes that have been access checked already
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//
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RtlInitializeGenericTable( &ClientContext->OperationCacheAvlTree,
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AzpAvlCacheCompare,
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AzpAvlAllocate,
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AzpAvlFree,
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NULL);
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}
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VOID
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AzpFlushOperationCache(
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IN PAZP_CLIENT_CONTEXT ClientContext
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)
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/*++
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Routine Description:
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Flushes the operation cache for a client context
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On entry, AcContext->ClientContext.CritSect must be locked OR
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AzGlResource must be locked exclusively.
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Arguments:
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ClientContext - Specifies the client context to flush the cache for
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Return Value:
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None
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--*/
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{
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ULONG i;
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PAZP_OPERATION_CACHE OperationCache;
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//
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// Initialization
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//
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ASSERT( AzpIsCritsectLocked( &ClientContext->CritSect ) ||
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AzpIsLockedExclusive( &AzGlResource ) );
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//
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// Loop until the OperationCache is empty
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//
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for (;;) {
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//
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// Get the first element in the table
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//
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OperationCache = (PAZP_OPERATION_CACHE) RtlEnumerateGenericTable( &ClientContext->OperationCacheAvlTree, TRUE );
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if ( OperationCache == NULL ) {
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break;
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}
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//
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// Dereference the Scope object
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//
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if ( OperationCache->Scope != NULL ) {
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ObDereferenceObject( &OperationCache->Scope->GenericObject );
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OperationCache->Scope = NULL;
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}
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//
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// Dereference the Operation object
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//
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ObDereferenceObject( &OperationCache->Operation->GenericObject );
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//
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// Delete the entry
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//
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RtlDeleteElementGenericTable( &ClientContext->OperationCacheAvlTree, OperationCache );
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}
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ASSERT (RtlNumberGenericTableElementsAvl(&ClientContext->OperationCacheAvlTree) == 0);
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//
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// Ditch the arrays of cached parameters
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//
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if ( ClientContext->UsedParameterNames != NULL ) {
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for ( i=0; i<ClientContext->UsedParameterCount; i++) {
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VariantClear( &ClientContext->UsedParameterNames[i] );
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VariantClear( &ClientContext->UsedParameterValues[i] );
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}
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AzpFreeHeap( ClientContext->UsedParameterNames );
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ClientContext->UsedParameterNames = NULL;
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// UsedParameterValues is a part of the UsedParameterNames allocated block
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ClientContext->UsedParameterValues = NULL;
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ClientContext->UsedParameterCount = 0;
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}
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}
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BOOLEAN
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AzpCheckOperationCache(
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IN PACCESS_CHECK_CONTEXT AcContext
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)
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/*++
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Routine Description:
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This routine checks checks to see if this access check can be satisified by the
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cache of operations.
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On entry, AcContext->ClientContext.CritSect must be locked.
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On entry, AzGlResource must be locked Shared.
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Arguments:
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AcContext - Specifies the context of the user to check group membership of.
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AcContext is updated to indicate any operations that are know to be allowed or denied.
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Return Value:
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TRUE - All operations were satisfied from cache
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--*/
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{
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ULONG WinStatus;
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ULONG OpIndex;
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ULONG i;
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PAZP_CLIENT_CONTEXT ClientContext = AcContext->ClientContext;
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AZP_OPERATION_CACHE TemplateOperationCache = {0};
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PAZP_OPERATION_CACHE OperationCache;
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//
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// Initialization
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//
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ASSERT( AzpIsLockedShared( &AzGlResource ) );
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ASSERT( AzpIsCritsectLocked( &ClientContext->CritSect ) );
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//
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// Check to ensure we should be using the operation cache
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//
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// Avoid the cache if any interfaces were passed by the caller
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// (This could relaxed. It doesn't make any difference that the interface was
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// passed by the caller. It only matters if the interface was actually used.
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// So we could set a boolean in CScriptEngine::GetItemInfo and simply not cache
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// operations that used the interfaces.)
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//
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if ( AcContext->Interfaces != NULL ) {
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AzPrint(( AZD_ACCESS_MORE,
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"AzpCheckOperationCache: Operation cache avoided since interfaces passed in\n" ));
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return FALSE;
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}
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//
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// If object cache has changed,
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// flush the operation cache.
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//
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// This code doesn't prevent the object cache from changing *during* the access check
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// call. That's fine. It does protect against changes made prior to the access check call.
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//
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if ( ClientContext->OpCacheSerialNumber !=
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ClientContext->GenericObject.AzStoreObject->OpCacheSerialNumber ) {
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AzpFlushOperationCache( ClientContext );
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//
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// Update the serial number to the new serial number
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//
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AzPrint(( AZD_ACCESS_MORE, "AzpCheckOperationCache: OpCacheSerialNumber changed from %ld to %ld\n",
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ClientContext->OpCacheSerialNumber,
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ClientContext->GenericObject.AzStoreObject->OpCacheSerialNumber ));
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ClientContext->OpCacheSerialNumber =
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ClientContext->GenericObject.AzStoreObject->OpCacheSerialNumber;
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}
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//
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// If the cache is empty,
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// we're done now
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//
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if ( RtlNumberGenericTableElementsAvl(&ClientContext->OperationCacheAvlTree) == 0 ) {
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return FALSE;
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}
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//
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// If any of the parmeters used to build the operation cache have changed,
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// Don't use the operation cache.
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//
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//
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// We didn't capture the array
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// So access it under a try/except
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__try {
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//
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// If the number of passed parameters changed in size,
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// flush the cache
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//
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if ( ClientContext->UsedParameterCount != 0 &&
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ClientContext->UsedParameterCount != AcContext->ParameterCount ) {
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AzPrint(( AZD_CRITICAL,
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"AzpCheckOperationCache: Parameter count changed from previous call %ld %ld\n",
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ClientContext->UsedParameterCount,
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AcContext->ParameterCount ));
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AzpFlushOperationCache( ClientContext );
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}
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//
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//
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// For each name on the existing list of used paramaters,
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// check to ensure the value hasn't change
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//
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for ( i=0; i<ClientContext->UsedParameterCount; i++ ) {
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//
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// Skip parameters that weren't used on the previous call
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//
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if ( V_VT(&ClientContext->UsedParameterNames[i] ) == VT_EMPTY ) {
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continue;
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}
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//
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// If the used parameter wasn't passed in on this new call,
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// or if the used parameter has a different value on this new call,
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// flush the cache
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//
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// We rely on the fact that the app always passes the same parameter names
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// on every AccessCheck call. That is reasonable since the app has a fixed
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// contract with the bizrule writers to supply a fixed set of parameters.
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//
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if ( i >= AcContext->ParameterCount ||
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AzpCompareParameterNames(
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&ClientContext->UsedParameterNames[i],
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&AcContext->ParameterNames[i] ) != 0 ||
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VarCmp(
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&ClientContext->UsedParameterValues[i],
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&AcContext->ParameterValues[i],
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LOCALE_USER_DEFAULT, 0 ) != (HRESULT)VARCMP_EQ ) {
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AzPrint(( AZD_ACCESS_MORE,
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"AzpCheckOperationCache: Parameter '%ws' changed from previous call\n",
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V_BSTR( &ClientContext->UsedParameterNames[i] ) ));
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AzpFlushOperationCache( ClientContext );
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break;
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}
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}
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} __except( EXCEPTION_EXECUTE_HANDLER ) {
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AzPrint((AZD_CRITICAL, "AzpUpdateOperationCache took an exception: 0x%lx\n", GetExceptionCode()));
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return FALSE;
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}
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//
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// Loop handling each operation
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//
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for ( OpIndex=0; OpIndex<AcContext->OperationCount; OpIndex++ ) {
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//
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// Lookup the scope/operation pair in the operation cache
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//
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TemplateOperationCache.Scope = AcContext->Scope;
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TemplateOperationCache.Operation = AcContext->OperationObjects[OpIndex];
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OperationCache = (PAZP_OPERATION_CACHE) RtlLookupElementGenericTable (
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&ClientContext->OperationCacheAvlTree,
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&TemplateOperationCache );
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if ( OperationCache == NULL ) {
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continue;
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}
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//
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// Return the bizrule string for this operation
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// The caller cannot depend upon order of evaluation.
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// Therefore, only the first cached string need be returned.
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//
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if ( AcContext->BusinessRuleString.StringSize == 0 ) {
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WinStatus = AzpDuplicateString( &AcContext->BusinessRuleString,
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&OperationCache->BizRuleString );
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if ( WinStatus != NO_ERROR ) {
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return FALSE;
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}
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}
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//
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// The operation result was found,
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// return it.
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//
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AcContext->Results[OpIndex] = OperationCache->Result;
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AcContext->OperationWasProcessed[OpIndex] = TRUE;
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AcContext->ProcessedOperationCount++;
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AcContext->CachedOperationCount++;
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AzPrint(( AZD_ACCESS_MORE,
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"AzpCheckOperationCache: '%ws/%ws' found in operation cache\n",
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OperationCache->Scope != NULL ? OperationCache->Scope->GenericObject.ObjectName->ObjectName.String : NULL,
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OperationCache->Operation->GenericObject.ObjectName->ObjectName.String,
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OperationCache->Result ));
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if (AcContext->OperationCount == AcContext->CachedOperationCount) {
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return TRUE;
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}
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}
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return FALSE;
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}
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VOID
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AzpUpdateOperationCache(
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IN PACCESS_CHECK_CONTEXT AcContext
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)
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/*++
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Routine Description:
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This routine updated the operation cache with new results.
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On entry, AcContext->ClientContext.CritSect must be locked.
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On entry, AzGlResource must be locked Shared.
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Arguments:
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AcContext - Specifies the context of the user to check group membership of.
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AcContext is updated to indicate any operations that are know to be allowed or denied.
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Return Value:
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None
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--*/
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{
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ULONG OpIndex;
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PAZP_CLIENT_CONTEXT ClientContext = AcContext->ClientContext;
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HRESULT hr;
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ULONG i;
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#ifdef USE_AVL_FULL
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PVOID NodeOrParent;
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TABLE_SEARCH_RESULT SearchResult;
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#endif USE_AVL_FULL
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BOOLEAN NewElement;
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PAZP_OPERATION_CACHE TemplateOperationCache = NULL;
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ULONG TemplateOperationCacheSize;
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PAZP_OPERATION_CACHE OperationCache;
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|
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//
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// Initialization
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//
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ASSERT( AzpIsLockedShared( &AzGlResource ) );
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ASSERT( AzpIsCritsectLocked( &ClientContext->CritSect ) );
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//
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// If we aren't supposed to use the cache for this AccessCheck,
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// we're done
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//
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if ( AcContext->Interfaces != NULL ) {
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goto Cleanup;
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}
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//
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// If all operations were satisfied via the cache,
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// simply return
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//
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if ( AcContext->CachedOperationCount == AcContext->OperationCount ) {
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AzPrint(( AZD_ACCESS_MORE,
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"AzpUpdateOperationCache: No operations to cache\n" ));
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goto Cleanup;
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}
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|
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//
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// Save the list of "used" parameters
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//
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// This is a combined list of all parameters used on this call and
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// all the parameters used on previous calls.
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//
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// Skip this if there are no newly used parameters
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//
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if ( AcContext->UsedParameterCount != 0 ) {
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|
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//
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// We didn't capture the array
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// So access it under a try/except
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__try {
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ASSERT( AcContext->ParameterCount != 0 );
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ASSERT( ClientContext->UsedParameterCount == 0 ||
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ClientContext->UsedParameterCount == AcContext->ParameterCount );
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|
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//
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// If no buffer has been allocated yet,
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// allocate and initialize it.
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//
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if ( ClientContext->UsedParameterCount == 0 ) {
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VARIANT *ParameterNames = NULL;
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//
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// Allocate the array
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//
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ParameterNames = (VARIANT *) AzpAllocateHeap(
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2 * sizeof(VARIANT) * AcContext->ParameterCount,
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"OPCACHE"
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);
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if ( ParameterNames == NULL ) {
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goto Cleanup;
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}
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//
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// Initialize all of the variants to VT_EMPTY
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//
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for ( i=0; i<AcContext->ParameterCount*2; i++ ) {
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VariantInit( &ParameterNames[i] );
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}
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//
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// Store the pointers to the initialized arrays
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//
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ClientContext->UsedParameterNames = ParameterNames;
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ClientContext->UsedParameterValues = &ParameterNames[AcContext->ParameterCount];
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ClientContext->UsedParameterCount = AcContext->ParameterCount;
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}
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|
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//
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// Copy the new names into the new buffer
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//
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for ( i=0; i<AcContext->ParameterCount; i++ ) {
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|
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//
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// Only copy parameters that have been used
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// and weren't copy on a previous call
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//
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|
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if ( AcContext->UsedParameters[i] &&
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V_VT(&ClientContext->UsedParameterNames[i]) == VT_EMPTY ) {
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hr = VariantCopy( &ClientContext->UsedParameterNames[i],
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&AcContext->ParameterNames[i] );
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|
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if ( FAILED(hr) ) {
|
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goto Cleanup;
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}
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|
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hr = VariantCopy( &ClientContext->UsedParameterValues[i],
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&AcContext->ParameterValues[i] );
|
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|
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if ( FAILED(hr) ) {
|
|
VariantClear( &ClientContext->UsedParameterNames[i] );
|
|
goto Cleanup;
|
|
}
|
|
|
|
|
|
AzPrint(( AZD_ACCESS_MORE,
|
|
"AzpUpdateOperationCache: Added parameter '%ws' to the used parameter list\n",
|
|
V_BSTR( &ClientContext->UsedParameterNames[i] ) ));
|
|
|
|
}
|
|
}
|
|
|
|
} __except( EXCEPTION_EXECUTE_HANDLER ) {
|
|
|
|
hr = GetExceptionCode();
|
|
AzPrint((AZD_CRITICAL, "AzpUpdateOperationCache took an exception: 0x%lx\n", hr));
|
|
goto Cleanup;
|
|
}
|
|
|
|
}
|
|
|
|
//
|
|
// Allocate a template for the operation cache entry
|
|
//
|
|
|
|
TemplateOperationCacheSize = sizeof(AZP_OPERATION_CACHE) + AcContext->BusinessRuleString.StringSize;
|
|
SafeAllocaAllocate( TemplateOperationCache, TemplateOperationCacheSize );
|
|
|
|
if ( TemplateOperationCache == NULL ) {
|
|
goto Cleanup;
|
|
}
|
|
|
|
//
|
|
// Loop handling each operation
|
|
//
|
|
|
|
for ( OpIndex=0; OpIndex<AcContext->OperationCount; OpIndex++ ) {
|
|
|
|
//
|
|
// Lookup the scope/operation pair in the operation cache
|
|
//
|
|
|
|
TemplateOperationCache->Scope = AcContext->Scope;
|
|
TemplateOperationCache->Operation = AcContext->OperationObjects[OpIndex];
|
|
|
|
AzPrint(( AZD_ACCESS_MORE,
|
|
"AzpUpdateOperationCache: Added '%ws/%ws' %ld to operation cache\n",
|
|
AcContext->Scope != NULL ? AcContext->Scope->GenericObject.ObjectName->ObjectName.String : NULL,
|
|
AcContext->OperationObjects[OpIndex]->GenericObject.ObjectName->ObjectName.String,
|
|
AcContext->Results[OpIndex] ));
|
|
|
|
OperationCache = (PAZP_OPERATION_CACHE)
|
|
#ifdef USE_AVL_FULL
|
|
RtlLookupElementGenericTableFull(
|
|
#else // USE_AVL_FULL
|
|
RtlLookupElementGenericTable(
|
|
#endif // USE_AVL_FULL
|
|
&ClientContext->OperationCacheAvlTree,
|
|
TemplateOperationCache
|
|
#ifdef USE_AVL_FULL
|
|
,
|
|
&NodeOrParent,
|
|
&SearchResult
|
|
#endif // USE_AVL_FULL
|
|
);
|
|
|
|
if ( OperationCache == NULL ) {
|
|
|
|
OperationCache = (PAZP_OPERATION_CACHE)
|
|
#ifdef USE_AVL_FULL
|
|
RtlInsertElementGenericTableFull(
|
|
#else // USE_AVL_FULL
|
|
RtlInsertElementGenericTable(
|
|
#endif // USE_AVL_FULL
|
|
&ClientContext->OperationCacheAvlTree,
|
|
TemplateOperationCache,
|
|
TemplateOperationCacheSize,
|
|
&NewElement
|
|
#ifdef USE_AVL_FULL
|
|
,
|
|
NodeOrParent,
|
|
SearchResult
|
|
#endif // USE_AVL_FULL
|
|
);
|
|
|
|
if ( OperationCache == NULL ) {
|
|
continue;
|
|
}
|
|
|
|
ASSERT( NewElement );
|
|
|
|
//
|
|
// Initialize the new element
|
|
//
|
|
|
|
if ( OperationCache->Scope != NULL) {
|
|
InterlockedIncrement( &OperationCache->Scope->GenericObject.ReferenceCount );
|
|
AzpDumpGoRef( "Scope Cache", &OperationCache->Scope->GenericObject );
|
|
}
|
|
|
|
InterlockedIncrement( &OperationCache->Operation->GenericObject.ReferenceCount );
|
|
AzpDumpGoRef( "Operation Cache", &OperationCache->Operation->GenericObject );
|
|
|
|
OperationCache->Result = AcContext->Results[OpIndex];
|
|
|
|
//
|
|
// Fill in the biz rule string
|
|
// Don't bother if the result is NO_ERROR.
|
|
//
|
|
|
|
if ( OperationCache->Result != NO_ERROR ) {
|
|
OperationCache->BizRuleString.String = (LPWSTR)&OperationCache[1];
|
|
OperationCache->BizRuleString.StringSize = AcContext->BusinessRuleString.StringSize;
|
|
|
|
if ( AcContext->BusinessRuleString.StringSize != 0 ) {
|
|
RtlCopyMemory( OperationCache->BizRuleString.String,
|
|
AcContext->BusinessRuleString.String,
|
|
AcContext->BusinessRuleString.StringSize );
|
|
}
|
|
} else {
|
|
OperationCache->BizRuleString.StringSize = 0;
|
|
}
|
|
|
|
//
|
|
// The operation is already cached.
|
|
// This is one of two cases:
|
|
// * The result was already filled in by AzpCheckOperationCache
|
|
// * The caller passed the same operation in twice
|
|
//
|
|
// In the latter case, the cache is assumed to be correct. Return the
|
|
// cached value for the all results.
|
|
//
|
|
|
|
} else {
|
|
AcContext->Results[OpIndex] = OperationCache->Result;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
//
|
|
// Free locally used resources
|
|
//
|
|
Cleanup:
|
|
|
|
SafeAllocaFree( TemplateOperationCache );
|
|
return;
|
|
|
|
}
|