mirror of
https://github.com/reactos/reactos.git
synced 2024-08-27 13:48:42 +00:00
809 lines
25 KiB
C
809 lines
25 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/se/accesschk.c
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* PURPOSE: Security manager
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*
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* PROGRAMMERS: No programmer listed.
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*/
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/* INCLUDES *******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS ********************************************************************/
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/* PRIVATE FUNCTIONS **********************************************************/
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/*
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* FIXME: Incomplete!
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*/
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BOOLEAN NTAPI
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SepAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
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IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
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IN ACCESS_MASK DesiredAccess,
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IN POBJECT_TYPE_LIST ObjectTypeList,
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IN ULONG ObjectTypeListLength,
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IN ACCESS_MASK PreviouslyGrantedAccess,
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OUT PPRIVILEGE_SET* Privileges,
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IN PGENERIC_MAPPING GenericMapping,
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IN KPROCESSOR_MODE AccessMode,
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OUT PACCESS_MASK GrantedAccessList,
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OUT PNTSTATUS AccessStatusList,
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IN BOOLEAN UseResultList)
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{
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ACCESS_MASK RemainingAccess;
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ACCESS_MASK TempAccess;
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ACCESS_MASK TempGrantedAccess = 0;
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ACCESS_MASK TempDeniedAccess = 0;
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PACCESS_TOKEN Token;
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ULONG i, ResultListLength;
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PACL Dacl;
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BOOLEAN Present;
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BOOLEAN Defaulted;
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PACE CurrentAce;
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PSID Sid;
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NTSTATUS Status;
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PAGED_CODE();
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DPRINT("SepAccessCheck()\n");
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/* Check for no access desired */
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if (!DesiredAccess)
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{
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/* Check if we had no previous access */
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if (!PreviouslyGrantedAccess)
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{
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/* Then there's nothing to give */
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Status = STATUS_ACCESS_DENIED;
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goto ReturnCommonStatus;
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}
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/* Return the previous access only */
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Status = STATUS_SUCCESS;
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*Privileges = NULL;
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goto ReturnCommonStatus;
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}
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/* Map given accesses */
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RtlMapGenericMask(&DesiredAccess, GenericMapping);
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if (PreviouslyGrantedAccess)
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RtlMapGenericMask(&PreviouslyGrantedAccess, GenericMapping);
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/* Initialize remaining access rights */
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RemainingAccess = DesiredAccess;
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Token = SubjectSecurityContext->ClientToken ?
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SubjectSecurityContext->ClientToken : SubjectSecurityContext->PrimaryToken;
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/* Check for ACCESS_SYSTEM_SECURITY and WRITE_OWNER access */
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Status = SePrivilegePolicyCheck(&RemainingAccess,
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&PreviouslyGrantedAccess,
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NULL,
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Token,
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NULL,
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UserMode);
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if (!NT_SUCCESS(Status))
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{
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goto ReturnCommonStatus;
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}
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/* Succeed if there are no more rights to grant */
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if (RemainingAccess == 0)
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{
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Status = STATUS_SUCCESS;
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goto ReturnCommonStatus;
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}
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/* Get the DACL */
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Status = RtlGetDaclSecurityDescriptor(SecurityDescriptor,
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&Present,
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&Dacl,
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&Defaulted);
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if (!NT_SUCCESS(Status))
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{
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goto ReturnCommonStatus;
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}
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/* RULE 1: Grant desired access if the object is unprotected */
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if (Present == FALSE || Dacl == NULL)
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{
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PreviouslyGrantedAccess |= RemainingAccess;
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if (RemainingAccess & MAXIMUM_ALLOWED)
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{
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PreviouslyGrantedAccess &= ~MAXIMUM_ALLOWED;
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PreviouslyGrantedAccess |= GenericMapping->GenericAll;
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}
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Status = STATUS_SUCCESS;
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goto ReturnCommonStatus;
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}
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/* Deny access if the DACL is empty */
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if (Dacl->AceCount == 0)
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{
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if (RemainingAccess == MAXIMUM_ALLOWED && PreviouslyGrantedAccess != 0)
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{
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Status = STATUS_SUCCESS;
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}
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else
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{
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PreviouslyGrantedAccess = 0;
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Status = STATUS_ACCESS_DENIED;
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}
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goto ReturnCommonStatus;
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}
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/* Determine the MAXIMUM_ALLOWED access rights according to the DACL */
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if (DesiredAccess & MAXIMUM_ALLOWED)
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{
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CurrentAce = (PACE)(Dacl + 1);
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for (i = 0; i < Dacl->AceCount; i++)
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{
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if (!(CurrentAce->Header.AceFlags & INHERIT_ONLY_ACE))
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{
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Sid = (PSID)(CurrentAce + 1);
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if (CurrentAce->Header.AceType == ACCESS_DENIED_ACE_TYPE)
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{
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if (SepSidInToken(Token, Sid))
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{
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/* Map access rights from the ACE */
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TempAccess = CurrentAce->AccessMask;
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RtlMapGenericMask(&TempAccess, GenericMapping);
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/* Deny access rights that have not been granted yet */
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TempDeniedAccess |= (TempAccess & ~TempGrantedAccess);
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}
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}
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else if (CurrentAce->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
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{
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if (SepSidInToken(Token, Sid))
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{
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/* Map access rights from the ACE */
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TempAccess = CurrentAce->AccessMask;
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RtlMapGenericMask(&TempAccess, GenericMapping);
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/* Grant access rights that have not been denied yet */
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TempGrantedAccess |= (TempAccess & ~TempDeniedAccess);
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}
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}
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else
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{
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DPRINT1("Unsupported ACE type 0x%lx\n", CurrentAce->Header.AceType);
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}
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}
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/* Get the next ACE */
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CurrentAce = (PACE)((ULONG_PTR)CurrentAce + CurrentAce->Header.AceSize);
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}
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/* Fail if some rights have not been granted */
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RemainingAccess &= ~(MAXIMUM_ALLOWED | TempGrantedAccess);
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if (RemainingAccess != 0)
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{
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PreviouslyGrantedAccess = 0;
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Status = STATUS_ACCESS_DENIED;
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goto ReturnCommonStatus;
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}
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/* Set granted access right and access status */
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PreviouslyGrantedAccess |= TempGrantedAccess;
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if (PreviouslyGrantedAccess != 0)
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{
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Status = STATUS_SUCCESS;
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}
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else
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{
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Status = STATUS_ACCESS_DENIED;
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}
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goto ReturnCommonStatus;
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}
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/* RULE 4: Grant rights according to the DACL */
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CurrentAce = (PACE)(Dacl + 1);
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for (i = 0; i < Dacl->AceCount; i++)
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{
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if (!(CurrentAce->Header.AceFlags & INHERIT_ONLY_ACE))
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{
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Sid = (PSID)(CurrentAce + 1);
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if (CurrentAce->Header.AceType == ACCESS_DENIED_ACE_TYPE)
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{
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if (SepSidInToken(Token, Sid))
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{
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/* Map access rights from the ACE */
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TempAccess = CurrentAce->AccessMask;
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RtlMapGenericMask(&TempAccess, GenericMapping);
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/* Leave if a remaining right must be denied */
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if (RemainingAccess & TempAccess)
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break;
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}
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}
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else if (CurrentAce->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
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{
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if (SepSidInToken(Token, Sid))
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{
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/* Map access rights from the ACE */
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TempAccess = CurrentAce->AccessMask;
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DPRINT("TempAccess 0x%08lx\n", TempAccess);
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RtlMapGenericMask(&TempAccess, GenericMapping);
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/* Remove granted rights */
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DPRINT("RemainingAccess 0x%08lx TempAccess 0x%08lx\n", RemainingAccess, TempAccess);
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RemainingAccess &= ~TempAccess;
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DPRINT("RemainingAccess 0x%08lx\n", RemainingAccess);
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}
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}
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else
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{
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DPRINT1("Unsupported ACE type 0x%lx\n", CurrentAce->Header.AceType);
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}
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}
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/* Get the next ACE */
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CurrentAce = (PACE)((ULONG_PTR)CurrentAce + CurrentAce->Header.AceSize);
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}
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DPRINT("DesiredAccess %08lx\nPreviouslyGrantedAccess %08lx\nRemainingAccess %08lx\n",
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DesiredAccess, PreviouslyGrantedAccess, RemainingAccess);
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/* Fail if some rights have not been granted */
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if (RemainingAccess != 0)
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{
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DPRINT("HACK: RemainingAccess = 0x%08lx DesiredAccess = 0x%08lx\n", RemainingAccess, DesiredAccess);
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#if 0
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/* HACK HACK HACK */
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Status = STATUS_ACCESS_DENIED;
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goto ReturnCommonStatus;
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#endif
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}
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/* Set granted access rights */
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PreviouslyGrantedAccess |= DesiredAccess;
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/* Fail if no rights have been granted */
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if (PreviouslyGrantedAccess == 0)
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{
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DPRINT1("PreviouslyGrantedAccess == 0 DesiredAccess = %08lx\n", DesiredAccess);
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Status = STATUS_ACCESS_DENIED;
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goto ReturnCommonStatus;
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}
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Status = STATUS_SUCCESS;
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goto ReturnCommonStatus;
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ReturnCommonStatus:
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ResultListLength = UseResultList ? ObjectTypeListLength : 1;
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for (i = 0; i < ResultListLength; i++)
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{
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GrantedAccessList[i] = PreviouslyGrantedAccess;
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AccessStatusList[i] = Status;
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}
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return NT_SUCCESS(Status);
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}
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static PSID
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SepGetSDOwner(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
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{
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PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
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PSID Owner;
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if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
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Owner = (PSID)((ULONG_PTR)SecurityDescriptor->Owner +
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(ULONG_PTR)SecurityDescriptor);
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else
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Owner = (PSID)SecurityDescriptor->Owner;
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return Owner;
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}
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static PSID
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SepGetSDGroup(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
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{
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PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
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PSID Group;
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if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
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Group = (PSID)((ULONG_PTR)SecurityDescriptor->Group +
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(ULONG_PTR)SecurityDescriptor);
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else
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Group = (PSID)SecurityDescriptor->Group;
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return Group;
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}
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static
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ULONG
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SepGetPrivilegeSetLength(IN PPRIVILEGE_SET PrivilegeSet)
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{
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if (PrivilegeSet == NULL)
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return 0;
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if (PrivilegeSet->PrivilegeCount == 0)
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return (ULONG)(sizeof(PRIVILEGE_SET) - sizeof(LUID_AND_ATTRIBUTES));
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return (ULONG)(sizeof(PRIVILEGE_SET) +
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(PrivilegeSet->PrivilegeCount - 1) * sizeof(LUID_AND_ATTRIBUTES));
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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/*
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* @implemented
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*/
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BOOLEAN
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NTAPI
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SeAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
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IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
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IN BOOLEAN SubjectContextLocked,
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IN ACCESS_MASK DesiredAccess,
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IN ACCESS_MASK PreviouslyGrantedAccess,
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OUT PPRIVILEGE_SET* Privileges,
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IN PGENERIC_MAPPING GenericMapping,
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IN KPROCESSOR_MODE AccessMode,
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OUT PACCESS_MASK GrantedAccess,
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OUT PNTSTATUS AccessStatus)
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{
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BOOLEAN ret;
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PAGED_CODE();
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/* Check if this is kernel mode */
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if (AccessMode == KernelMode)
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{
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/* Check if kernel wants everything */
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if (DesiredAccess & MAXIMUM_ALLOWED)
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{
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/* Give it */
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*GrantedAccess = GenericMapping->GenericAll;
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*GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
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*GrantedAccess |= PreviouslyGrantedAccess;
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}
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else
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{
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/* Give the desired and previous access */
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*GrantedAccess = DesiredAccess | PreviouslyGrantedAccess;
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}
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/* Success */
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*AccessStatus = STATUS_SUCCESS;
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return TRUE;
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}
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/* Check if we didn't get an SD */
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if (!SecurityDescriptor)
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{
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/* Automatic failure */
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*AccessStatus = STATUS_ACCESS_DENIED;
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return FALSE;
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}
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/* Check for invalid impersonation */
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if ((SubjectSecurityContext->ClientToken) &&
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(SubjectSecurityContext->ImpersonationLevel < SecurityImpersonation))
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{
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*AccessStatus = STATUS_BAD_IMPERSONATION_LEVEL;
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return FALSE;
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}
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/* Acquire the lock if needed */
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if (!SubjectContextLocked)
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SeLockSubjectContext(SubjectSecurityContext);
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/* Check if the token is the owner and grant WRITE_DAC and READ_CONTROL rights */
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if (DesiredAccess & (WRITE_DAC | READ_CONTROL | MAXIMUM_ALLOWED))
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{
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PACCESS_TOKEN Token = SubjectSecurityContext->ClientToken ?
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SubjectSecurityContext->ClientToken : SubjectSecurityContext->PrimaryToken;
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if (SepTokenIsOwner(Token,
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SecurityDescriptor,
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FALSE))
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{
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if (DesiredAccess & MAXIMUM_ALLOWED)
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PreviouslyGrantedAccess |= (WRITE_DAC | READ_CONTROL);
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else
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PreviouslyGrantedAccess |= (DesiredAccess & (WRITE_DAC | READ_CONTROL));
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DesiredAccess &= ~(WRITE_DAC | READ_CONTROL);
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}
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}
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if (DesiredAccess == 0)
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{
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*GrantedAccess = PreviouslyGrantedAccess;
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if (PreviouslyGrantedAccess == 0)
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{
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DPRINT1("Request for zero access to an object. Denying.\n");
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*AccessStatus = STATUS_ACCESS_DENIED;
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ret = FALSE;
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}
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else
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{
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*AccessStatus = STATUS_SUCCESS;
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ret = TRUE;
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}
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}
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else
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{
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/* Call the internal function */
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ret = SepAccessCheck(SecurityDescriptor,
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SubjectSecurityContext,
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DesiredAccess,
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NULL,
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0,
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PreviouslyGrantedAccess,
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Privileges,
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GenericMapping,
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AccessMode,
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GrantedAccess,
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AccessStatus,
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FALSE);
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}
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/* Release the lock if needed */
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if (!SubjectContextLocked)
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SeUnlockSubjectContext(SubjectSecurityContext);
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return ret;
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}
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/*
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* @implemented
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*/
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BOOLEAN
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NTAPI
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SeFastTraverseCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
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IN PACCESS_STATE AccessState,
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IN ACCESS_MASK DesiredAccess,
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IN KPROCESSOR_MODE AccessMode)
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{
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PACL Dacl;
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ULONG AceIndex;
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PKNOWN_ACE Ace;
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PAGED_CODE();
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ASSERT(AccessMode != KernelMode);
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if (SecurityDescriptor == NULL)
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return FALSE;
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/* Get DACL */
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Dacl = SepGetDaclFromDescriptor(SecurityDescriptor);
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/* If no DACL, grant access */
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if (Dacl == NULL)
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return TRUE;
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/* No ACE -> Deny */
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if (!Dacl->AceCount)
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return FALSE;
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/* Can't perform the check on restricted token */
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if (AccessState->Flags & TOKEN_IS_RESTRICTED)
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return FALSE;
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/* Browse the ACEs */
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for (AceIndex = 0, Ace = (PKNOWN_ACE)((ULONG_PTR)Dacl + sizeof(ACL));
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AceIndex < Dacl->AceCount;
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AceIndex++, Ace = (PKNOWN_ACE)((ULONG_PTR)Ace + Ace->Header.AceSize))
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{
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if (Ace->Header.AceFlags & INHERIT_ONLY_ACE)
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continue;
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/* If access-allowed ACE */
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if (Ace->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
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{
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/* Check if all accesses are granted */
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if (!(Ace->Mask & DesiredAccess))
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continue;
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/* Check SID and grant access if matching */
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if (RtlEqualSid(SeWorldSid, &(Ace->SidStart)))
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return TRUE;
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}
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/* If access-denied ACE */
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else if (Ace->Header.AceType == ACCESS_DENIED_ACE_TYPE)
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{
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/* Here, only check if it denies any access wanted and deny if so */
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if (Ace->Mask & DesiredAccess)
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return FALSE;
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}
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}
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/* Faulty, deny */
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return FALSE;
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}
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/* SYSTEM CALLS ***************************************************************/
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/*
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* @implemented
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*/
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NTSTATUS
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NTAPI
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NtAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
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IN HANDLE TokenHandle,
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IN ACCESS_MASK DesiredAccess,
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IN PGENERIC_MAPPING GenericMapping,
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OUT PPRIVILEGE_SET PrivilegeSet OPTIONAL,
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IN OUT PULONG PrivilegeSetLength,
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OUT PACCESS_MASK GrantedAccess,
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OUT PNTSTATUS AccessStatus)
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{
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PSECURITY_DESCRIPTOR CapturedSecurityDescriptor = NULL;
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SECURITY_SUBJECT_CONTEXT SubjectSecurityContext;
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KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
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ACCESS_MASK PreviouslyGrantedAccess = 0;
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PPRIVILEGE_SET Privileges = NULL;
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ULONG CapturedPrivilegeSetLength, RequiredPrivilegeSetLength;
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PTOKEN Token;
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NTSTATUS Status;
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PAGED_CODE();
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/* Check if this is kernel mode */
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if (PreviousMode == KernelMode)
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{
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/* Check if kernel wants everything */
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if (DesiredAccess & MAXIMUM_ALLOWED)
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{
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/* Give it */
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*GrantedAccess = GenericMapping->GenericAll;
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*GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
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}
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else
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{
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/* Just give the desired access */
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*GrantedAccess = DesiredAccess;
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}
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/* Success */
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*AccessStatus = STATUS_SUCCESS;
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return STATUS_SUCCESS;
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}
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/* Protect probe in SEH */
|
|
_SEH2_TRY
|
|
{
|
|
/* Probe all pointers */
|
|
ProbeForRead(GenericMapping, sizeof(GENERIC_MAPPING), sizeof(ULONG));
|
|
ProbeForRead(PrivilegeSetLength, sizeof(ULONG), sizeof(ULONG));
|
|
ProbeForWrite(PrivilegeSet, *PrivilegeSetLength, sizeof(ULONG));
|
|
ProbeForWrite(GrantedAccess, sizeof(ACCESS_MASK), sizeof(ULONG));
|
|
ProbeForWrite(AccessStatus, sizeof(NTSTATUS), sizeof(ULONG));
|
|
|
|
/* Capture the privilege set length and the mapping */
|
|
CapturedPrivilegeSetLength = *PrivilegeSetLength;
|
|
}
|
|
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
|
|
{
|
|
/* Return the exception code */
|
|
_SEH2_YIELD(return _SEH2_GetExceptionCode());
|
|
}
|
|
_SEH2_END;
|
|
|
|
/* Check for unmapped access rights */
|
|
if (DesiredAccess & (GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL))
|
|
return STATUS_GENERIC_NOT_MAPPED;
|
|
|
|
/* Reference the token */
|
|
Status = ObReferenceObjectByHandle(TokenHandle,
|
|
TOKEN_QUERY,
|
|
SeTokenObjectType,
|
|
PreviousMode,
|
|
(PVOID*)&Token,
|
|
NULL);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
DPRINT("Failed to reference token (Status %lx)\n", Status);
|
|
return Status;
|
|
}
|
|
|
|
/* Check token type */
|
|
if (Token->TokenType != TokenImpersonation)
|
|
{
|
|
DPRINT("No impersonation token\n");
|
|
ObDereferenceObject(Token);
|
|
return STATUS_NO_IMPERSONATION_TOKEN;
|
|
}
|
|
|
|
/* Check the impersonation level */
|
|
if (Token->ImpersonationLevel < SecurityIdentification)
|
|
{
|
|
DPRINT("Impersonation level < SecurityIdentification\n");
|
|
ObDereferenceObject(Token);
|
|
return STATUS_BAD_IMPERSONATION_LEVEL;
|
|
}
|
|
|
|
/* Check for ACCESS_SYSTEM_SECURITY and WRITE_OWNER access */
|
|
Status = SePrivilegePolicyCheck(&DesiredAccess,
|
|
&PreviouslyGrantedAccess,
|
|
NULL,
|
|
Token,
|
|
&Privileges,
|
|
PreviousMode);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
DPRINT("SePrivilegePolicyCheck failed (Status 0x%08lx)\n", Status);
|
|
ObDereferenceObject(Token);
|
|
*AccessStatus = Status;
|
|
*GrantedAccess = 0;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
/* Check the size of the privilege set and return the privileges */
|
|
if (Privileges != NULL)
|
|
{
|
|
DPRINT("Privileges != NULL\n");
|
|
|
|
/* Calculate the required privilege set buffer size */
|
|
RequiredPrivilegeSetLength = SepGetPrivilegeSetLength(Privileges);
|
|
|
|
/* Fail if the privilege set buffer is too small */
|
|
if (CapturedPrivilegeSetLength < RequiredPrivilegeSetLength)
|
|
{
|
|
ObDereferenceObject(Token);
|
|
SeFreePrivileges(Privileges);
|
|
*PrivilegeSetLength = RequiredPrivilegeSetLength;
|
|
return STATUS_BUFFER_TOO_SMALL;
|
|
}
|
|
|
|
/* Copy the privilege set to the caller */
|
|
RtlCopyMemory(PrivilegeSet,
|
|
Privileges,
|
|
RequiredPrivilegeSetLength);
|
|
|
|
/* Free the local privilege set */
|
|
SeFreePrivileges(Privileges);
|
|
}
|
|
else
|
|
{
|
|
DPRINT("Privileges == NULL\n");
|
|
|
|
/* Fail if the privilege set buffer is too small */
|
|
if (CapturedPrivilegeSetLength < sizeof(PRIVILEGE_SET))
|
|
{
|
|
ObDereferenceObject(Token);
|
|
*PrivilegeSetLength = sizeof(PRIVILEGE_SET);
|
|
return STATUS_BUFFER_TOO_SMALL;
|
|
}
|
|
|
|
/* Initialize the privilege set */
|
|
PrivilegeSet->PrivilegeCount = 0;
|
|
PrivilegeSet->Control = 0;
|
|
}
|
|
|
|
/* Capture the security descriptor */
|
|
Status = SeCaptureSecurityDescriptor(SecurityDescriptor,
|
|
PreviousMode,
|
|
PagedPool,
|
|
FALSE,
|
|
&CapturedSecurityDescriptor);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
DPRINT("Failed to capture the Security Descriptor\n");
|
|
ObDereferenceObject(Token);
|
|
return Status;
|
|
}
|
|
|
|
/* Check the captured security descriptor */
|
|
if (CapturedSecurityDescriptor == NULL)
|
|
{
|
|
DPRINT("Security Descriptor is NULL\n");
|
|
ObDereferenceObject(Token);
|
|
return STATUS_INVALID_SECURITY_DESCR;
|
|
}
|
|
|
|
/* Check security descriptor for valid owner and group */
|
|
if (SepGetSDOwner(SecurityDescriptor) == NULL || // FIXME: use CapturedSecurityDescriptor
|
|
SepGetSDGroup(SecurityDescriptor) == NULL) // FIXME: use CapturedSecurityDescriptor
|
|
{
|
|
DPRINT("Security Descriptor does not have a valid group or owner\n");
|
|
SeReleaseSecurityDescriptor(CapturedSecurityDescriptor,
|
|
PreviousMode,
|
|
FALSE);
|
|
ObDereferenceObject(Token);
|
|
return STATUS_INVALID_SECURITY_DESCR;
|
|
}
|
|
|
|
/* Set up the subject context, and lock it */
|
|
SeCaptureSubjectContext(&SubjectSecurityContext);
|
|
|
|
/* Lock the token */
|
|
SepAcquireTokenLockShared(Token);
|
|
|
|
/* Check if the token is the owner and grant WRITE_DAC and READ_CONTROL rights */
|
|
if (DesiredAccess & (WRITE_DAC | READ_CONTROL | MAXIMUM_ALLOWED))
|
|
{
|
|
if (SepTokenIsOwner(Token, SecurityDescriptor, FALSE)) // FIXME: use CapturedSecurityDescriptor
|
|
{
|
|
if (DesiredAccess & MAXIMUM_ALLOWED)
|
|
PreviouslyGrantedAccess |= (WRITE_DAC | READ_CONTROL);
|
|
else
|
|
PreviouslyGrantedAccess |= (DesiredAccess & (WRITE_DAC | READ_CONTROL));
|
|
|
|
DesiredAccess &= ~(WRITE_DAC | READ_CONTROL);
|
|
}
|
|
}
|
|
|
|
if (DesiredAccess == 0)
|
|
{
|
|
*GrantedAccess = PreviouslyGrantedAccess;
|
|
*AccessStatus = STATUS_SUCCESS;
|
|
}
|
|
else
|
|
{
|
|
/* Now perform the access check */
|
|
SepAccessCheck(SecurityDescriptor, // FIXME: use CapturedSecurityDescriptor
|
|
&SubjectSecurityContext,
|
|
DesiredAccess,
|
|
NULL,
|
|
0,
|
|
PreviouslyGrantedAccess,
|
|
&PrivilegeSet, //FIXME
|
|
GenericMapping,
|
|
PreviousMode,
|
|
GrantedAccess,
|
|
AccessStatus,
|
|
FALSE);
|
|
}
|
|
|
|
/* Release subject context and unlock the token */
|
|
SeReleaseSubjectContext(&SubjectSecurityContext);
|
|
SepReleaseTokenLock(Token);
|
|
|
|
/* Release the captured security descriptor */
|
|
SeReleaseSecurityDescriptor(CapturedSecurityDescriptor,
|
|
PreviousMode,
|
|
FALSE);
|
|
|
|
/* Dereference the token */
|
|
ObDereferenceObject(Token);
|
|
|
|
/* Check succeeded */
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
NTAPI
|
|
NtAccessCheckByType(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
|
|
IN PSID PrincipalSelfSid,
|
|
IN HANDLE ClientToken,
|
|
IN ACCESS_MASK DesiredAccess,
|
|
IN POBJECT_TYPE_LIST ObjectTypeList,
|
|
IN ULONG ObjectTypeLength,
|
|
IN PGENERIC_MAPPING GenericMapping,
|
|
IN PPRIVILEGE_SET PrivilegeSet,
|
|
IN OUT PULONG PrivilegeSetLength,
|
|
OUT PACCESS_MASK GrantedAccess,
|
|
OUT PNTSTATUS AccessStatus)
|
|
{
|
|
UNIMPLEMENTED;
|
|
return STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NTSTATUS
|
|
NTAPI
|
|
NtAccessCheckByTypeResultList(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
|
|
IN PSID PrincipalSelfSid,
|
|
IN HANDLE ClientToken,
|
|
IN ACCESS_MASK DesiredAccess,
|
|
IN POBJECT_TYPE_LIST ObjectTypeList,
|
|
IN ULONG ObjectTypeLength,
|
|
IN PGENERIC_MAPPING GenericMapping,
|
|
IN PPRIVILEGE_SET PrivilegeSet,
|
|
IN OUT PULONG PrivilegeSetLength,
|
|
OUT PACCESS_MASK GrantedAccess,
|
|
OUT PNTSTATUS AccessStatus)
|
|
{
|
|
UNIMPLEMENTED;
|
|
return STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
/* EOF */
|