reactos/ntoskrnl/se/sd.c

/*
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         ReactOS kernel
 * FILE:            ntoskrnl/se/sd.c
 * PURPOSE:         Security manager
 *
 * PROGRAMMERS:     David Welch <welch@cwcom.net>
 */

/* INCLUDES *******************************************************************/

#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>

#if defined (ALLOC_PRAGMA)
#pragma alloc_text(INIT, SepInitSDs)
#endif

/* GLOBALS ********************************************************************/

PSECURITY_DESCRIPTOR SePublicDefaultSd = NULL;
PSECURITY_DESCRIPTOR SePublicDefaultUnrestrictedSd = NULL;
PSECURITY_DESCRIPTOR SePublicOpenSd = NULL;
PSECURITY_DESCRIPTOR SePublicOpenUnrestrictedSd = NULL;
PSECURITY_DESCRIPTOR SeSystemDefaultSd = NULL;
PSECURITY_DESCRIPTOR SeUnrestrictedSd = NULL;

/* PRIVATE FUNCTIONS **********************************************************/

BOOLEAN
INIT_FUNCTION
NTAPI
SepInitSDs(VOID)
{
    /* Create PublicDefaultSd */
    SePublicDefaultSd = ExAllocatePoolWithTag(PagedPool,
                                              sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SePublicDefaultSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SePublicDefaultSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SePublicDefaultSd,
                                 TRUE,
                                 SePublicDefaultDacl,
                                 FALSE);

    /* Create PublicDefaultUnrestrictedSd */
    SePublicDefaultUnrestrictedSd = ExAllocatePoolWithTag(PagedPool,
                                                          sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SePublicDefaultUnrestrictedSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SePublicDefaultUnrestrictedSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SePublicDefaultUnrestrictedSd,
                                 TRUE,
                                 SePublicDefaultUnrestrictedDacl,
                                 FALSE);

    /* Create PublicOpenSd */
    SePublicOpenSd = ExAllocatePoolWithTag(PagedPool,
                                           sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SePublicOpenSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SePublicOpenSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SePublicOpenSd,
                                 TRUE,
                                 SePublicOpenDacl,
                                 FALSE);

    /* Create PublicOpenUnrestrictedSd */
    SePublicOpenUnrestrictedSd = ExAllocatePoolWithTag(PagedPool,
                                                       sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SePublicOpenUnrestrictedSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SePublicOpenUnrestrictedSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SePublicOpenUnrestrictedSd,
                                 TRUE,
                                 SePublicOpenUnrestrictedDacl,
                                 FALSE);

    /* Create SystemDefaultSd */
    SeSystemDefaultSd = ExAllocatePoolWithTag(PagedPool,
                                              sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SeSystemDefaultSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SeSystemDefaultSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SeSystemDefaultSd,
                                 TRUE,
                                 SeSystemDefaultDacl,
                                 FALSE);

    /* Create UnrestrictedSd */
    SeUnrestrictedSd = ExAllocatePoolWithTag(PagedPool,
                                             sizeof(SECURITY_DESCRIPTOR), TAG_SD);
    if (SeUnrestrictedSd == NULL)
        return FALSE;

    RtlCreateSecurityDescriptor(SeUnrestrictedSd,
                                SECURITY_DESCRIPTOR_REVISION);
    RtlSetDaclSecurityDescriptor(SeUnrestrictedSd,
                                 TRUE,
                                 SeUnrestrictedDacl,
                                 FALSE);

    return TRUE;
}

NTSTATUS
NTAPI
SeSetWorldSecurityDescriptor(SECURITY_INFORMATION SecurityInformation,
                             PISECURITY_DESCRIPTOR SecurityDescriptor,
                             PULONG BufferLength)
{
    ULONG Current;
    ULONG SidSize;
    ULONG SdSize;
    NTSTATUS Status;
    PISECURITY_DESCRIPTOR_RELATIVE SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)SecurityDescriptor;

    DPRINT("SeSetWorldSecurityDescriptor() called\n");

    if (SecurityInformation == 0)
    {
        return STATUS_ACCESS_DENIED;
    }

    /* calculate the minimum size of the buffer */
    SidSize = RtlLengthSid(SeWorldSid);
    SdSize = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
    if (SecurityInformation & OWNER_SECURITY_INFORMATION)
        SdSize += SidSize;
    if (SecurityInformation & GROUP_SECURITY_INFORMATION)
        SdSize += SidSize;
    if (SecurityInformation & DACL_SECURITY_INFORMATION)
    {
        SdSize += sizeof(ACL) + sizeof(ACE) + SidSize;
    }

    if (*BufferLength < SdSize)
    {
        *BufferLength = SdSize;
        return STATUS_BUFFER_TOO_SMALL;
    }

    *BufferLength = SdSize;

    Status = RtlCreateSecurityDescriptorRelative(SdRel,
                                                 SECURITY_DESCRIPTOR_REVISION);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }

    Current = sizeof(SECURITY_DESCRIPTOR_RELATIVE);

    if (SecurityInformation & OWNER_SECURITY_INFORMATION)
    {
        RtlCopyMemory((PUCHAR)SdRel + Current, SeWorldSid, SidSize);
        SdRel->Owner = Current;
        Current += SidSize;
    }

    if (SecurityInformation & GROUP_SECURITY_INFORMATION)
    {
        RtlCopyMemory((PUCHAR)SdRel + Current, SeWorldSid, SidSize);
        SdRel->Group = Current;
        Current += SidSize;
    }

    if (SecurityInformation & DACL_SECURITY_INFORMATION)
    {
        PACL Dacl = (PACL)((PUCHAR)SdRel + Current);
        SdRel->Control |= SE_DACL_PRESENT;

        Status = RtlCreateAcl(Dacl,
                              sizeof(ACL) + sizeof(ACE) + SidSize,
                              ACL_REVISION);
        if (!NT_SUCCESS(Status))
            return Status;

        Status = RtlAddAccessAllowedAce(Dacl,
                                        ACL_REVISION,
                                        GENERIC_ALL,
                                        SeWorldSid);
        if (!NT_SUCCESS(Status))
            return Status;

        SdRel->Dacl = Current;
    }

    if (SecurityInformation & SACL_SECURITY_INFORMATION)
    {
        /* FIXME - SdRel->Control |= SE_SACL_PRESENT; */
    }

    return STATUS_SUCCESS;
}


NTSTATUS
NTAPI
SepCaptureSecurityQualityOfService(IN POBJECT_ATTRIBUTES ObjectAttributes  OPTIONAL,
                                   IN KPROCESSOR_MODE AccessMode,
                                   IN POOL_TYPE PoolType,
                                   IN BOOLEAN CaptureIfKernel,
                                   OUT PSECURITY_QUALITY_OF_SERVICE *CapturedSecurityQualityOfService,
                                   OUT PBOOLEAN Present)
{
    PSECURITY_QUALITY_OF_SERVICE CapturedQos;
    NTSTATUS Status = STATUS_SUCCESS;

    PAGED_CODE();

    ASSERT(CapturedSecurityQualityOfService);
    ASSERT(Present);

    if (ObjectAttributes != NULL)
    {
        if (AccessMode != KernelMode)
        {
            SECURITY_QUALITY_OF_SERVICE SafeQos;

            _SEH2_TRY
            {
                ProbeForRead(ObjectAttributes,
                             sizeof(OBJECT_ATTRIBUTES),
                             sizeof(ULONG));
                if (ObjectAttributes->Length == sizeof(OBJECT_ATTRIBUTES))
                {
                    if (ObjectAttributes->SecurityQualityOfService != NULL)
                    {
                        ProbeForRead(ObjectAttributes->SecurityQualityOfService,
                                     sizeof(SECURITY_QUALITY_OF_SERVICE),
                                     sizeof(ULONG));

                        if (((PSECURITY_QUALITY_OF_SERVICE)ObjectAttributes->SecurityQualityOfService)->Length ==
                            sizeof(SECURITY_QUALITY_OF_SERVICE))
                        {
                            /*
                             * Don't allocate memory here because ExAllocate should bugcheck
                             * the system if it's buggy, SEH would catch that! So make a local
                             * copy of the qos structure.
                             */
                            RtlCopyMemory(&SafeQos,
                                          ObjectAttributes->SecurityQualityOfService,
                                          sizeof(SECURITY_QUALITY_OF_SERVICE));
                            *Present = TRUE;
                        }
                        else
                        {
                            Status = STATUS_INVALID_PARAMETER;
                        }
                    }
                    else
                    {
                        *CapturedSecurityQualityOfService = NULL;
                        *Present = FALSE;
                    }
                }
                else
                {
                    Status = STATUS_INVALID_PARAMETER;
                }
            }
            _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
            {
                Status = _SEH2_GetExceptionCode();
            }
            _SEH2_END;

            if (NT_SUCCESS(Status))
            {
                if (*Present)
                {
                    CapturedQos = ExAllocatePool(PoolType,
                                                 sizeof(SECURITY_QUALITY_OF_SERVICE));
                    if (CapturedQos != NULL)
                    {
                        RtlCopyMemory(CapturedQos,
                                      &SafeQos,
                                      sizeof(SECURITY_QUALITY_OF_SERVICE));
                        *CapturedSecurityQualityOfService = CapturedQos;
                    }
                    else
                    {
                        Status = STATUS_INSUFFICIENT_RESOURCES;
                    }
                }
                else
                {
                    *CapturedSecurityQualityOfService = NULL;
                }
            }
        }
        else
        {
            if (ObjectAttributes->Length == sizeof(OBJECT_ATTRIBUTES))
            {
                if (CaptureIfKernel)
                {
                    if (ObjectAttributes->SecurityQualityOfService != NULL)
                    {
                        if (((PSECURITY_QUALITY_OF_SERVICE)ObjectAttributes->SecurityQualityOfService)->Length ==
                            sizeof(SECURITY_QUALITY_OF_SERVICE))
                        {
                            CapturedQos = ExAllocatePool(PoolType,
                                                         sizeof(SECURITY_QUALITY_OF_SERVICE));
                            if (CapturedQos != NULL)
                            {
                                RtlCopyMemory(CapturedQos,
                                              ObjectAttributes->SecurityQualityOfService,
                                              sizeof(SECURITY_QUALITY_OF_SERVICE));
                                *CapturedSecurityQualityOfService = CapturedQos;
                                *Present = TRUE;
                            }
                            else
                            {
                                Status = STATUS_INSUFFICIENT_RESOURCES;
                            }
                        }
                        else
                        {
                            Status = STATUS_INVALID_PARAMETER;
                        }
                    }
                    else
                    {
                        *CapturedSecurityQualityOfService = NULL;
                        *Present = FALSE;
                    }
                }
                else
                {
                    *CapturedSecurityQualityOfService = (PSECURITY_QUALITY_OF_SERVICE)ObjectAttributes->SecurityQualityOfService;
                    *Present = (ObjectAttributes->SecurityQualityOfService != NULL);
                }
            }
            else
            {
                Status = STATUS_INVALID_PARAMETER;
            }
        }
    }
    else
    {
        *CapturedSecurityQualityOfService = NULL;
        *Present = FALSE;
    }

    return Status;
}


VOID
NTAPI
SepReleaseSecurityQualityOfService(IN PSECURITY_QUALITY_OF_SERVICE CapturedSecurityQualityOfService  OPTIONAL,
                                   IN KPROCESSOR_MODE AccessMode,
                                   IN BOOLEAN CaptureIfKernel)
{
    PAGED_CODE();

    if (CapturedSecurityQualityOfService != NULL &&
        (AccessMode != KernelMode || CaptureIfKernel))
    {
        ExFreePool(CapturedSecurityQualityOfService);
    }
}

/* PUBLIC FUNCTIONS ***********************************************************/

static
ULONG
DetermineSIDSize(
    PISID Sid,
    PULONG OutSAC,
    KPROCESSOR_MODE ProcessorMode)
{
    ULONG Size;

    if (!Sid)
    {
        *OutSAC = 0;
        return 0;
    }

    if (ProcessorMode != KernelMode)
    {
        /* Securely access the buffers! */
        *OutSAC = ProbeForReadUchar(&Sid->SubAuthorityCount);
        Size = RtlLengthRequiredSid(*OutSAC);
        ProbeForRead(Sid, Size, sizeof(ULONG));
    }
    else
    {
        *OutSAC = Sid->SubAuthorityCount;
        Size = RtlLengthRequiredSid(*OutSAC);
    }

    return Size;
}

static
ULONG
DetermineACLSize(
    PACL Acl,
    KPROCESSOR_MODE ProcessorMode)
{
    ULONG Size;

    if (!Acl) return 0;

    if (ProcessorMode == KernelMode) return Acl->AclSize;

    /* Probe the buffers! */
    Size = ProbeForReadUshort(&Acl->AclSize);
    ProbeForRead(Acl, Size, sizeof(ULONG));

    return Size;
}

NTSTATUS
NTAPI
SeCaptureSecurityDescriptor(
    IN PSECURITY_DESCRIPTOR _OriginalSecurityDescriptor,
    IN KPROCESSOR_MODE CurrentMode,
    IN POOL_TYPE PoolType,
    IN BOOLEAN CaptureIfKernel,
    OUT PSECURITY_DESCRIPTOR *CapturedSecurityDescriptor)
{
    PISECURITY_DESCRIPTOR OriginalDescriptor = _OriginalSecurityDescriptor;
    SECURITY_DESCRIPTOR DescriptorCopy;
    PISECURITY_DESCRIPTOR_RELATIVE NewDescriptor;
    ULONG OwnerSAC = 0, GroupSAC = 0;
    ULONG OwnerSize = 0, GroupSize = 0;
    ULONG SaclSize = 0, DaclSize = 0;
    ULONG DescriptorSize = 0;
    ULONG Offset;

    if (!OriginalDescriptor)
    {
        /* Nothing to do... */
        *CapturedSecurityDescriptor = NULL;
        return STATUS_SUCCESS;
    }

    /* Quick path */
    if (CurrentMode == KernelMode && !CaptureIfKernel)
    {
        /* Check descriptor version */
        if (OriginalDescriptor->Revision != SECURITY_DESCRIPTOR_REVISION1)
        {
            return STATUS_UNKNOWN_REVISION;
        }

        *CapturedSecurityDescriptor = _OriginalSecurityDescriptor;
        return STATUS_SUCCESS;
    }

    _SEH2_TRY
    {
        if (CurrentMode != KernelMode)
        {
            ProbeForRead(OriginalDescriptor,
                         sizeof(SECURITY_DESCRIPTOR_RELATIVE),
                         sizeof(ULONG));
        }

        /* Check the descriptor version */
        if (OriginalDescriptor->Revision != SECURITY_DESCRIPTOR_REVISION1)
        {
            _SEH2_YIELD(return STATUS_UNKNOWN_REVISION);
        }

        if (CurrentMode != KernelMode)
        {
            /* Get the size of the descriptor */
            DescriptorSize = (OriginalDescriptor->Control & SE_SELF_RELATIVE) ?
                sizeof(SECURITY_DESCRIPTOR_RELATIVE) : sizeof(SECURITY_DESCRIPTOR);

            /* Probe the entire security descriptor structure. The SIDs
             * and ACLs will be probed and copied later though */
            ProbeForRead(OriginalDescriptor, DescriptorSize, sizeof(ULONG));
        }

        /* Now capture all fields and convert to an absolute descriptor */
        DescriptorCopy.Revision = OriginalDescriptor->Revision;
        DescriptorCopy.Sbz1 = OriginalDescriptor->Sbz1;
        DescriptorCopy.Control = OriginalDescriptor->Control & ~SE_SELF_RELATIVE;
        DescriptorCopy.Owner = SepGetOwnerFromDescriptor(OriginalDescriptor);
        DescriptorCopy.Group = SepGetGroupFromDescriptor(OriginalDescriptor);
        DescriptorCopy.Sacl = SepGetSaclFromDescriptor(OriginalDescriptor);
        DescriptorCopy.Dacl = SepGetDaclFromDescriptor(OriginalDescriptor);
        DescriptorSize = sizeof(SECURITY_DESCRIPTOR_RELATIVE);

        /* Determine owner and group sizes */
        OwnerSize = DetermineSIDSize(DescriptorCopy.Owner, &OwnerSAC, CurrentMode);
        DescriptorSize += ROUND_UP(OwnerSize, sizeof(ULONG));
        GroupSize = DetermineSIDSize(DescriptorCopy.Group, &GroupSAC, CurrentMode);
        DescriptorSize += ROUND_UP(GroupSize, sizeof(ULONG));

        /* Determine the size of the ACLs */
        if (DescriptorCopy.Control & SE_SACL_PRESENT)
        {
            /* Get the size and probe if user mode */
            SaclSize = DetermineACLSize(DescriptorCopy.Sacl, CurrentMode);
            DescriptorSize += ROUND_UP(SaclSize, sizeof(ULONG));
        }

        if (DescriptorCopy.Control & SE_DACL_PRESENT)
        {
            /* Get the size and probe if user mode */
            DaclSize = DetermineACLSize(DescriptorCopy.Dacl, CurrentMode);
            DescriptorSize += ROUND_UP(DaclSize, sizeof(ULONG));
        }
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        _SEH2_YIELD(return _SEH2_GetExceptionCode());
    }
    _SEH2_END

    /*
     * Allocate enough memory to store a complete copy of a self-relative
     * security descriptor
     */
    NewDescriptor = ExAllocatePoolWithTag(PoolType,
                                          DescriptorSize,
                                          TAG_SD);
    if (!NewDescriptor) return STATUS_INSUFFICIENT_RESOURCES;

    RtlZeroMemory(NewDescriptor, DescriptorSize);
    NewDescriptor->Revision = DescriptorCopy.Revision;
    NewDescriptor->Sbz1 = DescriptorCopy.Sbz1;
    NewDescriptor->Control = DescriptorCopy.Control | SE_SELF_RELATIVE;

    _SEH2_TRY
    {
        /*
         * Setup the offsets and copy the SIDs and ACLs to the new
         * self-relative security descriptor. Probing the pointers is not
         * neccessary anymore as we did that when collecting the sizes!
         * Make sure to validate the SIDs and ACLs *again* as they could have
         * been modified in the meanwhile!
         */
        Offset = sizeof(SECURITY_DESCRIPTOR_RELATIVE);

        if (DescriptorCopy.Owner)
        {
            if (!RtlValidSid(DescriptorCopy.Owner)) RtlRaiseStatus(STATUS_INVALID_SID);
            NewDescriptor->Owner = Offset;
            RtlCopyMemory((PUCHAR)NewDescriptor + Offset,
                          DescriptorCopy.Owner,
                          OwnerSize);
            Offset += ROUND_UP(OwnerSize, sizeof(ULONG));
        }

        if (DescriptorCopy.Group)
        {
            if (!RtlValidSid(DescriptorCopy.Group)) RtlRaiseStatus(STATUS_INVALID_SID);
            NewDescriptor->Group = Offset;
            RtlCopyMemory((PUCHAR)NewDescriptor + Offset,
                          DescriptorCopy.Group,
                          GroupSize);
            Offset += ROUND_UP(GroupSize, sizeof(ULONG));
        }

        if (DescriptorCopy.Sacl)
        {
            if (!RtlValidAcl(DescriptorCopy.Sacl)) RtlRaiseStatus(STATUS_INVALID_ACL);
            NewDescriptor->Sacl = Offset;
            RtlCopyMemory((PUCHAR)NewDescriptor + Offset,
                          DescriptorCopy.Sacl,
                          SaclSize);
            Offset += ROUND_UP(SaclSize, sizeof(ULONG));
        }

        if (DescriptorCopy.Dacl)
        {
            if (!RtlValidAcl(DescriptorCopy.Dacl)) RtlRaiseStatus(STATUS_INVALID_ACL);
            NewDescriptor->Dacl = Offset;
            RtlCopyMemory((PUCHAR)NewDescriptor + Offset,
                          DescriptorCopy.Dacl,
                          DaclSize);
            Offset += ROUND_UP(DaclSize, sizeof(ULONG));
        }

        /* Make sure the size was correct */
        ASSERT(Offset == DescriptorSize);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        /* We failed to copy the data to the new descriptor */
        ExFreePoolWithTag(NewDescriptor, TAG_SD);
        _SEH2_YIELD(return _SEH2_GetExceptionCode());
    }
    _SEH2_END;

    /*
     * We're finally done!
     * Copy the pointer to the captured descriptor to to the caller.
     */
    *CapturedSecurityDescriptor = NewDescriptor;
    return STATUS_SUCCESS;
}

/*
 * @implemented
 */
NTSTATUS NTAPI
SeQuerySecurityDescriptorInfo(IN PSECURITY_INFORMATION SecurityInformation,
                              IN OUT PSECURITY_DESCRIPTOR SecurityDescriptor,
                              IN OUT PULONG Length,
                              IN PSECURITY_DESCRIPTOR *ObjectsSecurityDescriptor OPTIONAL)
{
    PISECURITY_DESCRIPTOR ObjectSd;
    PISECURITY_DESCRIPTOR_RELATIVE RelSD;
    PSID Owner = NULL;
    PSID Group = NULL;
    PACL Dacl = NULL;
    PACL Sacl = NULL;
    ULONG OwnerLength = 0;
    ULONG GroupLength = 0;
    ULONG DaclLength = 0;
    ULONG SaclLength = 0;
    ULONG Control = 0;
    ULONG_PTR Current;
    ULONG SdLength;

    RelSD = (PISECURITY_DESCRIPTOR_RELATIVE)SecurityDescriptor;

    if (*ObjectsSecurityDescriptor == NULL)
    {
        if (*Length < sizeof(SECURITY_DESCRIPTOR_RELATIVE))
        {
            *Length = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
            return STATUS_BUFFER_TOO_SMALL;
        }

        *Length = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
        RtlCreateSecurityDescriptorRelative(RelSD,
                                            SECURITY_DESCRIPTOR_REVISION);
        return STATUS_SUCCESS;
    }

    ObjectSd = *ObjectsSecurityDescriptor;

    /* Calculate the required security descriptor length */
    Control = SE_SELF_RELATIVE;
    if ((*SecurityInformation & OWNER_SECURITY_INFORMATION) &&
        (ObjectSd->Owner != NULL))
    {
        Owner = (PSID)((ULONG_PTR)ObjectSd->Owner + (ULONG_PTR)ObjectSd);
        OwnerLength = ROUND_UP(RtlLengthSid(Owner), 4);
        Control |= (ObjectSd->Control & SE_OWNER_DEFAULTED);
    }

    if ((*SecurityInformation & GROUP_SECURITY_INFORMATION) &&
        (ObjectSd->Group != NULL))
    {
        Group = (PSID)((ULONG_PTR)ObjectSd->Group + (ULONG_PTR)ObjectSd);
        GroupLength = ROUND_UP(RtlLengthSid(Group), 4);
        Control |= (ObjectSd->Control & SE_GROUP_DEFAULTED);
    }

    if ((*SecurityInformation & DACL_SECURITY_INFORMATION) &&
        (ObjectSd->Control & SE_DACL_PRESENT))
    {
        if (ObjectSd->Dacl != NULL)
        {
            Dacl = (PACL)((ULONG_PTR)ObjectSd->Dacl + (ULONG_PTR)ObjectSd);
            DaclLength = ROUND_UP((ULONG)Dacl->AclSize, 4);
        }

        Control |= (ObjectSd->Control & (SE_DACL_DEFAULTED | SE_DACL_PRESENT));
    }

    if ((*SecurityInformation & SACL_SECURITY_INFORMATION) &&
        (ObjectSd->Control & SE_SACL_PRESENT))
    {
        if (ObjectSd->Sacl != NULL)
        {
            Sacl = (PACL)((ULONG_PTR)ObjectSd->Sacl + (ULONG_PTR)ObjectSd);
            SaclLength = ROUND_UP(Sacl->AclSize, 4);
        }

        Control |= (ObjectSd->Control & (SE_SACL_DEFAULTED | SE_SACL_PRESENT));
    }

    SdLength = OwnerLength + GroupLength + DaclLength +
    SaclLength + sizeof(SECURITY_DESCRIPTOR_RELATIVE);
    if (*Length < SdLength)
    {
        *Length = SdLength;
        return STATUS_BUFFER_TOO_SMALL;
    }

    /* Build the new security descrtiptor */
    RtlCreateSecurityDescriptorRelative(RelSD,
                                        SECURITY_DESCRIPTOR_REVISION);
    RelSD->Control = (USHORT)Control;

    Current = (ULONG_PTR)(RelSD + 1);

    if (OwnerLength != 0)
    {
        RtlCopyMemory((PVOID)Current,
                      Owner,
                      OwnerLength);
        RelSD->Owner = (ULONG)(Current - (ULONG_PTR)SecurityDescriptor);
        Current += OwnerLength;
    }

    if (GroupLength != 0)
    {
        RtlCopyMemory((PVOID)Current,
                      Group,
                      GroupLength);
        RelSD->Group = (ULONG)(Current - (ULONG_PTR)SecurityDescriptor);
        Current += GroupLength;
    }

    if (DaclLength != 0)
    {
        RtlCopyMemory((PVOID)Current,
                      Dacl,
                      DaclLength);
        RelSD->Dacl = (ULONG)(Current - (ULONG_PTR)SecurityDescriptor);
        Current += DaclLength;
    }

    if (SaclLength != 0)
    {
        RtlCopyMemory((PVOID)Current,
                      Sacl,
                      SaclLength);
        RelSD->Sacl = (ULONG)(Current - (ULONG_PTR)SecurityDescriptor);
        Current += SaclLength;
    }

    *Length = SdLength;

    return STATUS_SUCCESS;
}

/*
 * @implemented
 */
NTSTATUS
NTAPI
SeReleaseSecurityDescriptor(IN PSECURITY_DESCRIPTOR CapturedSecurityDescriptor,
                            IN KPROCESSOR_MODE CurrentMode,
                            IN BOOLEAN CaptureIfKernelMode)
{
    PAGED_CODE();

    /*
     * WARNING! You need to call this function with the same value for CurrentMode
     * and CaptureIfKernelMode that you previously passed to
     * SeCaptureSecurityDescriptor() in order to avoid memory leaks!
     */
    if (CapturedSecurityDescriptor != NULL &&
        (CurrentMode != KernelMode ||
         (CurrentMode == KernelMode && CaptureIfKernelMode)))
    {
        /* Only delete the descriptor when SeCaptureSecurityDescriptor() allocated one! */
        ExFreePoolWithTag(CapturedSecurityDescriptor, TAG_SD);
    }

    return STATUS_SUCCESS;
}

/*
 * @implemented
 */
NTSTATUS NTAPI
SeSetSecurityDescriptorInfo(IN PVOID Object OPTIONAL,
                            IN PSECURITY_INFORMATION _SecurityInformation,
                            IN PSECURITY_DESCRIPTOR _SecurityDescriptor,
                            IN OUT PSECURITY_DESCRIPTOR *ObjectsSecurityDescriptor,
                            IN POOL_TYPE PoolType,
                            IN PGENERIC_MAPPING GenericMapping)
{
    PISECURITY_DESCRIPTOR_RELATIVE ObjectSd;
    PISECURITY_DESCRIPTOR_RELATIVE NewSd;
    PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
    PISECURITY_DESCRIPTOR_RELATIVE RelSD = (PISECURITY_DESCRIPTOR_RELATIVE)SecurityDescriptor;
    PSID Owner = 0;
    PSID Group = 0;
    PACL Dacl = 0;
    PACL Sacl = 0;
    ULONG OwnerLength = 0;
    ULONG GroupLength = 0;
    ULONG DaclLength = 0;
    ULONG SaclLength = 0;
    ULONG Control = 0;
    ULONG Current;
    SECURITY_INFORMATION SecurityInformation;

    ObjectSd = *ObjectsSecurityDescriptor;

    /* The object does not have a security descriptor. */
    if (!ObjectSd)
        return STATUS_NO_SECURITY_ON_OBJECT;

    ASSERT(ObjectSd->Control & SE_SELF_RELATIVE);

    SecurityInformation = *_SecurityInformation;

    /* Get owner and owner size */
    if (SecurityInformation & OWNER_SECURITY_INFORMATION)
    {
        if (SecurityDescriptor->Owner != NULL)
        {
            if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
                Owner = (PSID)((ULONG_PTR)RelSD->Owner +
                               (ULONG_PTR)SecurityDescriptor);
            else
                Owner = (PSID)SecurityDescriptor->Owner;
            OwnerLength = ROUND_UP(RtlLengthSid(Owner), 4);
        }

        Control |= (SecurityDescriptor->Control & SE_OWNER_DEFAULTED);
    }
    else
    {
        if (ObjectSd->Owner)
        {
            Owner = (PSID)((ULONG_PTR)ObjectSd->Owner + (ULONG_PTR)ObjectSd);
            OwnerLength = ROUND_UP(RtlLengthSid(Owner), 4);
        }

        Control |= (ObjectSd->Control & SE_OWNER_DEFAULTED);
    }

    /* Get group and group size */
    if (SecurityInformation & GROUP_SECURITY_INFORMATION)
    {
        if (SecurityDescriptor->Group != NULL)
        {
            if( SecurityDescriptor->Control & SE_SELF_RELATIVE )
                Group = (PSID)((ULONG_PTR)SecurityDescriptor->Group +
                               (ULONG_PTR)SecurityDescriptor);
            else
                Group = (PSID)SecurityDescriptor->Group;
            GroupLength = ROUND_UP(RtlLengthSid(Group), 4);
        }

        Control |= (SecurityDescriptor->Control & SE_GROUP_DEFAULTED);
    }
    else
    {
        if (ObjectSd->Group)
        {
            Group = (PSID)((ULONG_PTR)ObjectSd->Group + (ULONG_PTR)ObjectSd);
            GroupLength = ROUND_UP(RtlLengthSid(Group), 4);
        }

        Control |= (ObjectSd->Control & SE_GROUP_DEFAULTED);
    }

    /* Get DACL and DACL size */
    if (SecurityInformation & DACL_SECURITY_INFORMATION)
    {
        if ((SecurityDescriptor->Control & SE_DACL_PRESENT) &&
            (SecurityDescriptor->Dacl != NULL))
        {
            if( SecurityDescriptor->Control & SE_SELF_RELATIVE )
                Dacl = (PACL)((ULONG_PTR)SecurityDescriptor->Dacl +
                              (ULONG_PTR)SecurityDescriptor);
            else
                Dacl = (PACL)SecurityDescriptor->Dacl;

            DaclLength = ROUND_UP((ULONG)Dacl->AclSize, 4);
        }

        Control |= (SecurityDescriptor->Control & (SE_DACL_DEFAULTED | SE_DACL_PRESENT));
    }
    else
    {
        if ((ObjectSd->Control & SE_DACL_PRESENT) && (ObjectSd->Dacl))
        {
            Dacl = (PACL)((ULONG_PTR)ObjectSd->Dacl + (ULONG_PTR)ObjectSd);
            DaclLength = ROUND_UP((ULONG)Dacl->AclSize, 4);
        }

        Control |= (ObjectSd->Control & (SE_DACL_DEFAULTED | SE_DACL_PRESENT));
    }

    /* Get SACL and SACL size */
    if (SecurityInformation & SACL_SECURITY_INFORMATION)
    {
        if ((SecurityDescriptor->Control & SE_SACL_PRESENT) &&
            (SecurityDescriptor->Sacl != NULL))
        {
            if( SecurityDescriptor->Control & SE_SELF_RELATIVE )
                Sacl = (PACL)((ULONG_PTR)SecurityDescriptor->Sacl +
                              (ULONG_PTR)SecurityDescriptor);
            else
                Sacl = (PACL)SecurityDescriptor->Sacl;
            SaclLength = ROUND_UP((ULONG)Sacl->AclSize, 4);
        }

        Control |= (SecurityDescriptor->Control & (SE_SACL_DEFAULTED | SE_SACL_PRESENT));
    }
    else
    {
        if ((ObjectSd->Control & SE_SACL_PRESENT) && (ObjectSd->Sacl))
        {
            Sacl = (PACL)((ULONG_PTR)ObjectSd->Sacl + (ULONG_PTR)ObjectSd);
            SaclLength = ROUND_UP((ULONG)Sacl->AclSize, 4);
        }

        Control |= (ObjectSd->Control & (SE_SACL_DEFAULTED | SE_SACL_PRESENT));
    }

    NewSd = ExAllocatePool(NonPagedPool,
                           sizeof(SECURITY_DESCRIPTOR_RELATIVE) + OwnerLength + GroupLength +
                           DaclLength + SaclLength);
    if (NewSd == NULL)
    {
        ObDereferenceObject(Object);
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlCreateSecurityDescriptor(NewSd,
                                SECURITY_DESCRIPTOR_REVISION1);

    /* We always build a self-relative descriptor */
    NewSd->Control = (USHORT)Control | SE_SELF_RELATIVE;

    Current = sizeof(SECURITY_DESCRIPTOR);

    if (OwnerLength != 0)
    {
        RtlCopyMemory((PUCHAR)NewSd + Current, Owner, OwnerLength);
        NewSd->Owner = Current;
        Current += OwnerLength;
    }

    if (GroupLength != 0)
    {
        RtlCopyMemory((PUCHAR)NewSd + Current, Group, GroupLength);
        NewSd->Group = Current;
        Current += GroupLength;
    }

    if (DaclLength != 0)
    {
        RtlCopyMemory((PUCHAR)NewSd + Current, Dacl, DaclLength);
        NewSd->Dacl = Current;
        Current += DaclLength;
    }

    if (SaclLength != 0)
    {
        RtlCopyMemory((PUCHAR)NewSd + Current, Sacl, SaclLength);
        NewSd->Sacl = Current;
        Current += SaclLength;
    }

    *ObjectsSecurityDescriptor = NewSd;
    return STATUS_SUCCESS;
}

/*
 * @unimplemented
 */
NTSTATUS
NTAPI
SeSetSecurityDescriptorInfoEx(IN PVOID Object OPTIONAL,
                              IN PSECURITY_INFORMATION SecurityInformation,
                              IN PSECURITY_DESCRIPTOR ModificationDescriptor,
                              IN OUT PSECURITY_DESCRIPTOR *ObjectsSecurityDescriptor,
                              IN ULONG AutoInheritFlags,
                              IN POOL_TYPE PoolType,
                              IN PGENERIC_MAPPING GenericMapping)
{
    PISECURITY_DESCRIPTOR ObjectSd = *ObjectsSecurityDescriptor;

    /* The object does not have a security descriptor. */
    if (!ObjectSd)
        return STATUS_NO_SECURITY_ON_OBJECT;

    UNIMPLEMENTED;
    return STATUS_NOT_IMPLEMENTED;
}


/*
 * @implemented
 */
BOOLEAN NTAPI
SeValidSecurityDescriptor(IN ULONG Length,
                          IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
{
    ULONG SdLength;
    PISID Sid;
    PACL Acl;
    PISECURITY_DESCRIPTOR_RELATIVE SecurityDescriptor = _SecurityDescriptor;

    if (Length < SECURITY_DESCRIPTOR_MIN_LENGTH)
    {
        DPRINT1("Invalid Security Descriptor revision\n");
        return FALSE;
    }

    if (SecurityDescriptor->Revision != SECURITY_DESCRIPTOR_REVISION1)
    {
        DPRINT1("Invalid Security Descriptor revision\n");
        return FALSE;
    }

    if (!(SecurityDescriptor->Control & SE_SELF_RELATIVE))
    {
        DPRINT1("No self-relative Security Descriptor\n");
        return FALSE;
    }

    SdLength = sizeof(SECURITY_DESCRIPTOR);

    /* Check Owner SID */
    if (SecurityDescriptor->Owner)
    {
        DPRINT1("No Owner SID\n");
        return FALSE;
    }

    if (SecurityDescriptor->Owner % sizeof(ULONG))
    {
        DPRINT1("Invalid Owner SID alignment\n");
        return FALSE;
    }

    Sid = (PISID)((ULONG_PTR)SecurityDescriptor + SecurityDescriptor->Owner);
    if (Sid->Revision != SID_REVISION)
    {
        DPRINT1("Invalid Owner SID revision\n");
        return FALSE;
    }

    SdLength += (sizeof(SID) + (Sid->SubAuthorityCount - 1) * sizeof(ULONG));
    if (Length < SdLength)
    {
        DPRINT1("Invalid Owner SID size\n");
        return FALSE;
    }

    /* Check Group SID */
    if (SecurityDescriptor->Group)
    {
        if (SecurityDescriptor->Group % sizeof(ULONG))
        {
            DPRINT1("Invalid Group SID alignment\n");
            return FALSE;
        }

        Sid = (PSID)((ULONG_PTR)SecurityDescriptor + SecurityDescriptor->Group);
        if (Sid->Revision != SID_REVISION)
        {
            DPRINT1("Invalid Group SID revision\n");
            return FALSE;
        }

        SdLength += (sizeof(SID) + (Sid->SubAuthorityCount - 1) * sizeof(ULONG));
        if (Length < SdLength)
        {
            DPRINT1("Invalid Group SID size\n");
            return FALSE;
        }
    }

    /* Check DACL */
    if (SecurityDescriptor->Dacl)
    {
        if (SecurityDescriptor->Dacl % sizeof(ULONG))
        {
            DPRINT1("Invalid DACL alignment\n");
            return FALSE;
        }

        Acl = (PACL)((ULONG_PTR)SecurityDescriptor + SecurityDescriptor->Dacl);
        if ((Acl->AclRevision < MIN_ACL_REVISION) &&
            (Acl->AclRevision > MAX_ACL_REVISION))
        {
            DPRINT1("Invalid DACL revision\n");
            return FALSE;
        }

        SdLength += Acl->AclSize;
        if (Length < SdLength)
        {
            DPRINT1("Invalid DACL size\n");
            return FALSE;
        }
    }

    /* Check SACL */
    if (SecurityDescriptor->Sacl)
    {
        if (SecurityDescriptor->Sacl % sizeof(ULONG))
        {
            DPRINT1("Invalid SACL alignment\n");
            return FALSE;
        }

        Acl = (PACL)((ULONG_PTR)SecurityDescriptor + SecurityDescriptor->Sacl);
        if ((Acl->AclRevision < MIN_ACL_REVISION) ||
            (Acl->AclRevision > MAX_ACL_REVISION))
        {
            DPRINT1("Invalid SACL revision\n");
            return FALSE;
        }

        SdLength += Acl->AclSize;
        if (Length < SdLength)
        {
            DPRINT1("Invalid SACL size\n");
            return FALSE;
        }
    }

    return TRUE;
}

/*
 * @implemented
 */
NTSTATUS NTAPI
SeDeassignSecurity(PSECURITY_DESCRIPTOR *SecurityDescriptor)
{
    PAGED_CODE();

    if (*SecurityDescriptor != NULL)
    {
        ExFreePoolWithTag(*SecurityDescriptor, TAG_SD);
        *SecurityDescriptor = NULL;
    }

    return STATUS_SUCCESS;
}



/*
 * @unimplemented
 */
NTSTATUS NTAPI
SeAssignSecurityEx(IN PSECURITY_DESCRIPTOR ParentDescriptor OPTIONAL,
                   IN PSECURITY_DESCRIPTOR ExplicitDescriptor OPTIONAL,
                   OUT PSECURITY_DESCRIPTOR *NewDescriptor,
                   IN GUID *ObjectType OPTIONAL,
                   IN BOOLEAN IsDirectoryObject,
                   IN ULONG AutoInheritFlags,
                   IN PSECURITY_SUBJECT_CONTEXT SubjectContext,
                   IN PGENERIC_MAPPING GenericMapping,
                   IN POOL_TYPE PoolType)
{
    UNIMPLEMENTED;
    return STATUS_NOT_IMPLEMENTED;
}

/*
 * @implemented
 */
NTSTATUS NTAPI
SeAssignSecurity(PSECURITY_DESCRIPTOR _ParentDescriptor OPTIONAL,
                 PSECURITY_DESCRIPTOR _ExplicitDescriptor OPTIONAL,
                 PSECURITY_DESCRIPTOR *NewDescriptor,
                 BOOLEAN IsDirectoryObject,
                 PSECURITY_SUBJECT_CONTEXT SubjectContext,
                 PGENERIC_MAPPING GenericMapping,
                 POOL_TYPE PoolType)
{
    PISECURITY_DESCRIPTOR ParentDescriptor = _ParentDescriptor;
    PISECURITY_DESCRIPTOR ExplicitDescriptor = _ExplicitDescriptor;
    PISECURITY_DESCRIPTOR_RELATIVE Descriptor;
    PTOKEN Token;
    ULONG OwnerLength = 0;
    ULONG GroupLength = 0;
    ULONG DaclLength = 0;
    ULONG SaclLength = 0;
    ULONG Length = 0;
    ULONG Control = 0;
    ULONG Current;
    PSID Owner = NULL;
    PSID Group = NULL;
    PACL Dacl = NULL;
    PACL Sacl = NULL;

    PAGED_CODE();

    /* Lock subject context */
    SeLockSubjectContext(SubjectContext);

    if (SubjectContext->ClientToken != NULL)
    {
        Token = SubjectContext->ClientToken;
    }
    else
    {
        Token = SubjectContext->PrimaryToken;
    }

    /* Inherit the Owner SID */
    if (ExplicitDescriptor != NULL)
    {
        DPRINT("Use explicit owner sid!\n");
        Owner = SepGetOwnerFromDescriptor(ExplicitDescriptor);
    }

    if (!Owner)
    {
        if (Token != NULL)
        {
            DPRINT("Use token owner sid!\n");
            Owner = Token->UserAndGroups[Token->DefaultOwnerIndex].Sid;
        }
        else
        {
            DPRINT("Use default owner sid!\n");
            Owner = SeLocalSystemSid;
        }

        Control |= SE_OWNER_DEFAULTED;
    }

    OwnerLength = ROUND_UP(RtlLengthSid(Owner), 4);

    /* Inherit the Group SID */
    if (ExplicitDescriptor != NULL)
    {
        Group = SepGetGroupFromDescriptor(ExplicitDescriptor);
    }

    if (!Group)
    {
        if (Token != NULL)
        {
            DPRINT("Use token group sid!\n");
            Group = Token->PrimaryGroup;
        }
        else
        {
            DPRINT("Use default group sid!\n");
            Group = SeLocalSystemSid;
        }

        Control |= SE_GROUP_DEFAULTED;
    }

    GroupLength = ROUND_UP(RtlLengthSid(Group), 4);

    /* Inherit the DACL */
    if (ExplicitDescriptor != NULL &&
        (ExplicitDescriptor->Control & SE_DACL_PRESENT) &&
        !(ExplicitDescriptor->Control & SE_DACL_DEFAULTED))
    {
        DPRINT("Use explicit DACL!\n");
        Dacl = SepGetDaclFromDescriptor(ExplicitDescriptor);
        Control |= SE_DACL_PRESENT;
    }
    else if (ParentDescriptor != NULL &&
             (ParentDescriptor->Control & SE_DACL_PRESENT))
    {
        DPRINT("Use parent DACL!\n");
        /* FIXME: Inherit */
        Dacl = SepGetDaclFromDescriptor(ParentDescriptor);
        Control |= (SE_DACL_PRESENT | SE_DACL_DEFAULTED);
    }
    else if (Token != NULL && Token->DefaultDacl != NULL)
    {
        DPRINT("Use token default DACL!\n");
        /* FIXME: Inherit */
        Dacl = Token->DefaultDacl;
        Control |= (SE_DACL_PRESENT | SE_DACL_DEFAULTED);
    }
    else
    {
        DPRINT("Use NULL DACL!\n");
        Dacl = NULL;
        Control |= (SE_DACL_PRESENT | SE_DACL_DEFAULTED);
    }

    DaclLength = (Dacl != NULL) ? ROUND_UP(Dacl->AclSize, 4) : 0;

    /* Inherit the SACL */
    if (ExplicitDescriptor != NULL &&
        (ExplicitDescriptor->Control & SE_SACL_PRESENT) &&
        !(ExplicitDescriptor->Control & SE_SACL_DEFAULTED))
    {
        DPRINT("Use explicit SACL!\n");
        Sacl = SepGetSaclFromDescriptor(ExplicitDescriptor);
        Control |= SE_SACL_PRESENT;
    }
    else if (ParentDescriptor != NULL &&
             (ParentDescriptor->Control & SE_SACL_PRESENT))
    {
        DPRINT("Use parent SACL!\n");
        /* FIXME: Inherit */
        Sacl = SepGetSaclFromDescriptor(ParentDescriptor);
        Control |= (SE_SACL_PRESENT | SE_SACL_DEFAULTED);
    }

    SaclLength = (Sacl != NULL) ? ROUND_UP(Sacl->AclSize, 4) : 0;

    /* Allocate and initialize the new security descriptor */
    Length = sizeof(SECURITY_DESCRIPTOR_RELATIVE) +
        OwnerLength + GroupLength + DaclLength + SaclLength;

    DPRINT("L: sizeof(SECURITY_DESCRIPTOR) %d OwnerLength %d GroupLength %d DaclLength %d SaclLength %d\n",
           sizeof(SECURITY_DESCRIPTOR),
           OwnerLength,
           GroupLength,
           DaclLength,
           SaclLength);

    Descriptor = ExAllocatePoolWithTag(PagedPool, Length, TAG_SD);
    if (Descriptor == NULL)
    {
        DPRINT1("ExAlloctePool() failed\n");
        /* FIXME: Unlock subject context */
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlZeroMemory(Descriptor, Length);
    RtlCreateSecurityDescriptor(Descriptor, SECURITY_DESCRIPTOR_REVISION);

    Descriptor->Control = (USHORT)Control | SE_SELF_RELATIVE;

    Current = sizeof(SECURITY_DESCRIPTOR_RELATIVE);

    if (SaclLength != 0)
    {
        RtlCopyMemory((PUCHAR)Descriptor + Current, Sacl, SaclLength);
        Descriptor->Sacl = Current;
        Current += SaclLength;
    }

    if (DaclLength != 0)
    {
        RtlCopyMemory((PUCHAR)Descriptor + Current, Dacl, DaclLength);
        Descriptor->Dacl = Current;
        Current += DaclLength;
    }

    if (OwnerLength != 0)
    {
        RtlCopyMemory((PUCHAR)Descriptor + Current, Owner, OwnerLength);
        Descriptor->Owner = Current;
        Current += OwnerLength;
        DPRINT("Owner of %x at %x\n", Descriptor, Descriptor->Owner);
    }
    else
    {
        DPRINT("Owner of %x is zero length\n", Descriptor);
    }

    if (GroupLength != 0)
    {
        RtlCopyMemory((PUCHAR)Descriptor + Current, Group, GroupLength);
        Descriptor->Group = Current;
    }

    /* Unlock subject context */
    SeUnlockSubjectContext(SubjectContext);

    *NewDescriptor = Descriptor;

    DPRINT("Descrptor %x\n", Descriptor);
    ASSERT(RtlLengthSecurityDescriptor(Descriptor));

    return STATUS_SUCCESS;
}

/* EOF */