[ros-diffs] [ion] 57261: [NTOSKRNL]: Small refactoring and optimizations to some Se routines, mainly generalizations for Restricted Token support once someone implements it. Also start using the token lock whe...

Author: ion
Date: Mon Sep 10 08:15:43 2012
New Revision: 57261
URL: http://svn.reactos.org/svn/reactos?rev=57261&view=rev
Log:
[NTOSKRNL]: Small refactoring and optimizations to some Se routines, mainly
generalizations for Restricted Token support once someone implements it. Also start using
the token lock when necessary. Add comments when missing. Nothing terribly exciting...
[NTOSKRNL]: As a side effect, implement SeCreateClientSecurityFromSubjectContext and
SeGetTokenControlInformation, although most of the code was already there.
[NTOSKRNL]: One useful change, SE_GROUP_USE_FOR_DENY_ONLY (Deny Only Groups) are now
handled correctly.
Modified:
    trunk/reactos/ntoskrnl/include/internal/se.h
    trunk/reactos/ntoskrnl/se/access.c
    trunk/reactos/ntoskrnl/se/sd.c
    trunk/reactos/ntoskrnl/se/semgr.c
Modified: trunk/reactos/ntoskrnl/include/internal/se.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/…
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/se.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/include/internal/se.h [iso-8859-1] Mon Sep 10 08:15:43 2012
@@ -1,4 +1,80 @@
 #pragma once
+
+PSID
+FORCEINLINE
+SepGetGroupFromDescriptor(PVOID _Descriptor)
+{
+    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
+    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
+
+    if (Descriptor->Control & SE_SELF_RELATIVE)
+    {
+        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Group) return NULL;
+        return (PSID)((ULONG_PTR)Descriptor + SdRel->Group);
+    }
+    else
+    {
+        return Descriptor->Group;
+    }
+}
+
+PSID
+FORCEINLINE
+SepGetOwnerFromDescriptor(PVOID _Descriptor)
+{
+    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
+    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
+
+    if (Descriptor->Control & SE_SELF_RELATIVE)
+    {
+        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Owner) return NULL;
+        return (PSID)((ULONG_PTR)Descriptor + SdRel->Owner);
+    }
+    else
+    {
+        return Descriptor->Owner;
+    }
+}
+
+PACL
+FORCEINLINE
+SepGetDaclFromDescriptor(PVOID _Descriptor)
+{
+    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
+    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
+
+    if (Descriptor->Control & SE_SELF_RELATIVE)
+    {
+        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Dacl) return NULL;
+        return (PACL)((ULONG_PTR)Descriptor + SdRel->Dacl);
+    }
+    else
+    {
+        return Descriptor->Dacl;
+    }
+}
+
+PACL
+FORCEINLINE
+SepGetSaclFromDescriptor(PVOID _Descriptor)
+{
+    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
+    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
+
+    if (Descriptor->Control & SE_SELF_RELATIVE)
+    {
+        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
+        if (!SdRel->Sacl) return NULL;
+        return (PACL)((ULONG_PTR)Descriptor + SdRel->Sacl);
+    }
+    else
+    {
+        return Descriptor->Sacl;
+    }
+}
 /* SID Authorities */
 extern SID_IDENTIFIER_AUTHORITY SeNullSidAuthority;
@@ -80,6 +156,34 @@
 extern PSECURITY_DESCRIPTOR SeSystemDefaultSd;
 extern PSECURITY_DESCRIPTOR SeUnrestrictedSd;
+//
+// Token Functions
+//
+BOOLEAN
+NTAPI
+SepTokenIsOwner(
+    IN PACCESS_TOKEN _Token,
+    IN PSECURITY_DESCRIPTOR SecurityDescriptor,
+    IN BOOLEAN TokenLocked
+);
+
+BOOLEAN
+NTAPI
+SepSidInToken(
+    IN PACCESS_TOKEN _Token,
+    IN PSID Sid
+);
+
+BOOLEAN
+NTAPI
+SepSidInTokenEx(
+    IN PACCESS_TOKEN _Token,
+    IN PSID PrincipalSelfSid,
+    IN PSID _Sid,
+    IN BOOLEAN Deny,
+    IN BOOLEAN Restricted
+);
+
 /* Functions */
 BOOLEAN
 NTAPI
Modified: trunk/reactos/ntoskrnl/se/access.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/se/access.c?rev=5…
==============================================================================
--- trunk/reactos/ntoskrnl/se/access.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/se/access.c [iso-8859-1] Mon Sep 10 08:15:43 2012
@@ -4,7 +4,7 @@
  * FILE:            ntoskrnl/se/access.c
  * PURPOSE:         Access state functions
  *
- * PROGRAMMERS:     Alex Ionescu (alex(a)relsoft.net) -
+ * PROGRAMMERS:     Alex Ionescu (alex(a)relsoft.net) -
  *                               Based on patch by Javier M. Mellid
  */
@@ -18,7 +18,251 @@
 ERESOURCE SepSubjectContextLock;
-/* FUNCTIONS ******************************************************************/
+/* PRIVATE FUNCTIONS **********************************************************/
+
+BOOLEAN
+NTAPI
+SepSidInTokenEx(IN PACCESS_TOKEN _Token,
+                IN PSID PrincipalSelfSid,
+                IN PSID _Sid,
+                IN BOOLEAN Deny,
+                IN BOOLEAN Restricted)
+{
+    ULONG i;
+    PTOKEN Token = (PTOKEN)_Token;
+    PISID TokenSid, Sid = (PISID)_Sid;
+    PSID_AND_ATTRIBUTES SidAndAttributes;
+    ULONG SidCount, SidLength;
+    USHORT SidMetadata;
+    PAGED_CODE();
+
+    /* Not yet supported */
+    ASSERT(PrincipalSelfSid == NULL);
+    ASSERT(Restricted == FALSE);
+
+    /* Check if a principal SID was given, and this is our current SID already */
+    if ((PrincipalSelfSid) && (RtlEqualSid(SePrincipalSelfSid, Sid)))
+    {
+        /* Just use the principal SID in this case */
+        Sid = PrincipalSelfSid;
+    }
+
+    /* Check if this is a restricted token or not */
+    if (Restricted)
+    {
+        /* Use the restricted SIDs and count */
+        SidAndAttributes = Token->RestrictedSids;
+        SidCount = Token->RestrictedSidCount;
+    }
+    else
+    {
+        /* Use the normal SIDs and count */
+        SidAndAttributes = Token->UserAndGroups;
+        SidCount = Token->UserAndGroupCount;
+    }
+
+    /* Do checks here by hand instead of the usual 4 function calls */
+    SidLength = FIELD_OFFSET(SID,
+                             SubAuthority[Sid->SubAuthorityCount]);
+    SidMetadata = *(PUSHORT)&Sid->Revision;
+
+    /* Loop every SID */
+    for (i = 0; i < SidCount; i++)
+    {
+        TokenSid = (PISID)SidAndAttributes->Sid;
+#if SE_SID_DEBUG
+        UNICODE_STRING sidString;
+        RtlConvertSidToUnicodeString(&sidString, TokenSid, TRUE);
+        DPRINT1("SID in Token: %wZ\n", &sidString);
+        RtlFreeUnicodeString(&sidString);
+#endif
+        /* Check if the SID metadata matches */
+        if (*(PUSHORT)&TokenSid->Revision == SidMetadata)
+        {
+            /* Check if the SID data matches */
+            if (RtlEqualMemory(Sid, TokenSid, SidLength))
+            {
+                /* Check if the group is enabled, or used for deny only */
+                if ((!(i) && !(SidAndAttributes->Attributes &
SE_GROUP_USE_FOR_DENY_ONLY)) ||
+                    (SidAndAttributes->Attributes & SE_GROUP_ENABLED) ||
+                    ((Deny) && (SidAndAttributes->Attributes &
SE_GROUP_USE_FOR_DENY_ONLY)))
+                {
+                    /* SID is present */
+                    return TRUE;
+                }
+                else
+                {
+                    /* SID is not present */
+                    return FALSE;
+                }
+            }
+        }
+
+        /* Move to the next SID */
+        SidAndAttributes++;
+    }
+
+    /* SID is not present */
+    return FALSE;
+}
+
+BOOLEAN
+NTAPI
+SepSidInToken(IN PACCESS_TOKEN _Token,
+              IN PSID Sid)
+{
+    /* Call extended API */
+    return SepSidInTokenEx(_Token, NULL, Sid, FALSE, FALSE);
+}
+
+BOOLEAN
+NTAPI
+SepTokenIsOwner(IN PACCESS_TOKEN _Token,
+                IN PSECURITY_DESCRIPTOR SecurityDescriptor,
+                IN BOOLEAN TokenLocked)
+{
+    PSID Sid;
+    BOOLEAN Result;
+    PTOKEN Token = _Token;
+
+    /* Get the owner SID */
+    Sid = SepGetOwnerFromDescriptor(SecurityDescriptor);
+    ASSERT(Sid != NULL);
+
+    /* Lock the token if needed */
+    if (!TokenLocked)
+    {
+        KeEnterCriticalRegion();
+        ExAcquireResourceSharedLite(Token->TokenLock, TRUE);
+    }
+
+    /* Check if the owner SID is found, handling restricted case as well */
+    Result = SepSidInToken(Token, Sid);
+    if ((Result) && (Token->TokenFlags & TOKEN_IS_RESTRICTED))
+    {
+        Result = SepSidInTokenEx(Token, NULL, Sid, FALSE, TRUE);
+    }
+
+    /* Release the lock if we had acquired it */
+    if (!TokenLocked)
+    {
+        ExReleaseResourceLite(Token->TokenLock);
+        KeLeaveCriticalRegion();
+    }
+
+    /* Return the result */
+    return Result;
+}
+
+VOID
+NTAPI
+SeGetTokenControlInformation(IN PACCESS_TOKEN _Token,
+                             OUT PTOKEN_CONTROL TokenControl)
+{
+    PTOKEN Token = _Token;
+    PAGED_CODE();
+
+    /* Capture the main fields */
+    TokenControl->AuthenticationId = Token->AuthenticationId;
+    TokenControl->TokenId = Token->TokenId;
+    TokenControl->TokenSource = Token->TokenSource;
+
+    /* Lock the token */
+    KeEnterCriticalRegion();
+    ExAcquireResourceSharedLite(Token->TokenLock, TRUE);
+
+    /* Capture the modified it */
+    TokenControl->ModifiedId = Token->ModifiedId;
+
+    /* Unlock it */
+    ExReleaseResourceLite(Token->TokenLock);
+    KeLeaveCriticalRegion();
+}
+
+NTSTATUS
+NTAPI
+SepCreateClientSecurity(IN PACCESS_TOKEN Token,
+                        IN PSECURITY_QUALITY_OF_SERVICE ClientSecurityQos,
+                        IN BOOLEAN ServerIsRemote,
+                        IN TOKEN_TYPE TokenType,
+                        IN BOOLEAN ThreadEffectiveOnly,
+                        IN SECURITY_IMPERSONATION_LEVEL ImpersonationLevel,
+                        OUT PSECURITY_CLIENT_CONTEXT ClientContext)
+{
+    NTSTATUS Status;
+    PACCESS_TOKEN NewToken;
+    PAGED_CODE();
+
+    /* Check for bogus impersonation level */
+    if (!VALID_IMPERSONATION_LEVEL(ClientSecurityQos->ImpersonationLevel))
+    {
+        /* Fail the call */
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    /* Check what kind of token this is */
+    if (TokenType != TokenImpersonation)
+    {
+        /* On a primary token, if we do direct access, copy the flag from the QOS */
+        ClientContext->DirectAccessEffectiveOnly =
ClientSecurityQos->EffectiveOnly;
+    }
+    else
+    {
+        /* This is an impersonation token, is the level ok? */
+        if (ClientSecurityQos->ImpersonationLevel > ImpersonationLevel)
+        {
+            /* Nope, fail */
+            return STATUS_BAD_IMPERSONATION_LEVEL;
+        }
+
+        /* Is the level too low, or are we doing something other than delegation remotely
*/
+        if ((ImpersonationLevel == SecurityAnonymous) ||
+            (ImpersonationLevel == SecurityIdentification) ||
+            ((ServerIsRemote) && (ImpersonationLevel != SecurityDelegation)))
+        {
+            /* Fail the call */
+            return STATUS_BAD_IMPERSONATION_LEVEL;
+        }
+
+        /* Pick either the thread setting or the QOS setting */
+        ClientContext->DirectAccessEffectiveOnly = ((ThreadEffectiveOnly) ||
+
(ClientSecurityQos->EffectiveOnly)) ? TRUE : FALSE;
+    }
+
+    /* Is this static tracking */
+    if (ClientSecurityQos->ContextTrackingMode == SECURITY_STATIC_TRACKING)
+    {
+        /* Do not use direct access and make a copy */
+        ClientContext->DirectlyAccessClientToken = FALSE;
+        Status = SeCopyClientToken(Token, ImpersonationLevel, 0, &NewToken);
+        if (!NT_SUCCESS(Status)) return Status;
+    }
+    else
+    {
+        /* Use direct access and check if this is local */
+        ClientContext->DirectlyAccessClientToken = TRUE;
+        if (ServerIsRemote)
+        {
+            /* We are doing delegation, so make a copy of the control data */
+            SeGetTokenControlInformation(Token,
+                                         &ClientContext->ClientTokenControl);
+        }
+
+        /* Keep the same token */
+        NewToken = Token;
+    }
+
+    /* Fill out the context and return success */
+    ClientContext->SecurityQos.Length = sizeof(SECURITY_QUALITY_OF_SERVICE);
+    ClientContext->SecurityQos.ImpersonationLevel =
ClientSecurityQos->ImpersonationLevel;
+    ClientContext->SecurityQos.ContextTrackingMode =
ClientSecurityQos->ContextTrackingMode;
+    ClientContext->SecurityQos.EffectiveOnly = ClientSecurityQos->EffectiveOnly;
+    ClientContext->ServerIsRemote = ServerIsRemote;
+    ClientContext->ClientToken = NewToken;
+    return STATUS_SUCCESS;
+}
+
+/* PUBLIC FUNCTIONS ***********************************************************/
 /*
  * @implemented
@@ -75,10 +319,21 @@
 NTAPI
 SeLockSubjectContext(IN PSECURITY_SUBJECT_CONTEXT SubjectContext)
 {
-    PAGED_CODE();
-
+    PTOKEN PrimaryToken, ClientToken;
+    PAGED_CODE();
+
+    /* Read both tokens */
+    PrimaryToken = SubjectContext->PrimaryToken;
+    ClientToken = SubjectContext->ClientToken;
+
+    /* Always lock the primary */
     KeEnterCriticalRegion();
-    ExAcquireResourceExclusiveLite(&SepSubjectContextLock, TRUE);
+    ExAcquireResourceSharedLite(PrimaryToken->TokenLock, TRUE);
+
+    /* Lock the impersonation one if it's there */
+    if (!ClientToken) return;
+    KeEnterCriticalRegion();
+    ExAcquireResourceSharedLite(ClientToken->TokenLock, TRUE);
 }
 /*
@@ -88,10 +343,21 @@
 NTAPI
 SeUnlockSubjectContext(IN PSECURITY_SUBJECT_CONTEXT SubjectContext)
 {
-    PAGED_CODE();
-
-    ExReleaseResourceLite(&SepSubjectContextLock);
+    PTOKEN PrimaryToken, ClientToken;
+    PAGED_CODE();
+
+    /* Read both tokens */
+    PrimaryToken = SubjectContext->PrimaryToken;
+    ClientToken = SubjectContext->ClientToken;
+
+    /* Always unlock the primary one */
+    ExReleaseResourceLite(PrimaryToken->TokenLock);
     KeLeaveCriticalRegion();
+
+    /* Unlock the impersonation one if it's there */
+    if (!ClientToken) return;
+    ExReleaseResourceLite(ClientToken->TokenLock);
+    KeLeaveCriticalRegion();
 }
 /*
@@ -103,15 +369,13 @@
 {
     PAGED_CODE();
-    if (SubjectContext->PrimaryToken != NULL)
-    {
-        ObFastDereferenceObject(&PsGetCurrentProcess()->Token,
SubjectContext->PrimaryToken);
-    }
-
-    if (SubjectContext->ClientToken != NULL)
-    {
-        ObDereferenceObject(SubjectContext->ClientToken);
-    }
+    /* Drop reference on the primary */
+    ObFastDereferenceObject(&PsGetCurrentProcess()->Token,
SubjectContext->PrimaryToken);
+    SubjectContext->PrimaryToken = NULL;
+
+    /* Drop reference on the impersonation, if there was one */
+    PsDereferenceImpersonationToken(SubjectContext->ClientToken);
+    SubjectContext->ClientToken = NULL;
 }
 /*
@@ -128,7 +392,6 @@
 {
     ACCESS_MASK AccessMask = Access;
     PTOKEN Token;
-
     PAGED_CODE();
     /* Map the Generic Acess to Specific Access if we have a Mapping */
@@ -139,6 +402,12 @@
     /* Initialize the Access State */
     RtlZeroMemory(AccessState, sizeof(ACCESS_STATE));
+    ASSERT(AccessState->SecurityDescriptor == NULL);
+    ASSERT(AccessState->PrivilegesAllocated == FALSE);
+
+    /* Initialize and save aux data */
+    RtlZeroMemory(AuxData, sizeof(AUX_ACCESS_DATA));
+    AccessState->AuxData = AuxData;
     /* Capture the Subject Context */
     SeCaptureSubjectContextEx(Thread,
@@ -146,15 +415,12 @@
                               &AccessState->SubjectSecurityContext);
     /* Set Access State Data */
-    AccessState->AuxData = AuxData;
-    AccessState->RemainingDesiredAccess  = AccessMask;
+    AccessState->RemainingDesiredAccess = AccessMask;
     AccessState->OriginalDesiredAccess = AccessMask;
     ExpAllocateLocallyUniqueId(&AccessState->OperationID);
     /* Get the Token to use */
-    Token = AccessState->SubjectSecurityContext.ClientToken ?
-            (PTOKEN)&AccessState->SubjectSecurityContext.ClientToken :
-            (PTOKEN)&AccessState->SubjectSecurityContext.PrimaryToken;
+    Token = SeQuerySubjectContextToken(&AccessState->SubjectSecurityContext);
     /* Check for Travers Privilege */
     if (Token->TokenFlags & TOKEN_HAS_TRAVERSE_PRIVILEGE)
@@ -202,7 +468,6 @@
 SeDeleteAccessState(IN PACCESS_STATE AccessState)
 {
     PAUX_ACCESS_DATA AuxData;
-
     PAGED_CODE();
     /* Get the Auxiliary Data */
@@ -255,69 +520,36 @@
     SECURITY_IMPERSONATION_LEVEL ImpersonationLevel;
     PACCESS_TOKEN Token;
     NTSTATUS Status;
-    PACCESS_TOKEN NewToken;
-
-    PAGED_CODE();
-
+    PAGED_CODE();
+
+    /* Reference the correct token */
     Token = PsReferenceEffectiveToken(Thread,
                                       &TokenType,
                                       &ThreadEffectiveOnly,
                                       &ImpersonationLevel);
-    if (TokenType != TokenImpersonation)
-    {
-        ClientContext->DirectAccessEffectiveOnly = Qos->EffectiveOnly;
-    }
-    else
-    {
-        if (Qos->ImpersonationLevel > ImpersonationLevel)
-        {
-            if (Token) ObDereferenceObject(Token);
-            return STATUS_BAD_IMPERSONATION_LEVEL;
-        }
-
-        if ((ImpersonationLevel == SecurityAnonymous) ||
-            (ImpersonationLevel == SecurityIdentification) ||
-            ((RemoteClient) && (ImpersonationLevel != SecurityDelegation)))
-        {
-            if (Token) ObDereferenceObject(Token);
-            return STATUS_BAD_IMPERSONATION_LEVEL;
-        }
-
-        ClientContext->DirectAccessEffectiveOnly = ((ThreadEffectiveOnly) ||
-                                                    (Qos->EffectiveOnly)) ? TRUE :
FALSE;
-    }
-
-    if (Qos->ContextTrackingMode == SECURITY_STATIC_TRACKING)
-    {
-        ClientContext->DirectlyAccessClientToken = FALSE;
-        Status = SeCopyClientToken(Token, ImpersonationLevel, 0, &NewToken);
-        if (!NT_SUCCESS(Status)) return Status;
-    }
-    else
-    {
-        ClientContext->DirectlyAccessClientToken = TRUE;
-        if (RemoteClient != FALSE)
-        {
-#if 0
-            SeGetTokenControlInformation(Token,
-                                         &ClientContext->ClientTokenControl);
-#endif
-        }
-
-        NewToken = Token;
-    }
-
-    ClientContext->SecurityQos.Length = sizeof(SECURITY_QUALITY_OF_SERVICE);
-    ClientContext->SecurityQos.ImpersonationLevel = Qos->ImpersonationLevel;
-    ClientContext->SecurityQos.ContextTrackingMode = Qos->ContextTrackingMode;
-    ClientContext->SecurityQos.EffectiveOnly = Qos->EffectiveOnly;
-    ClientContext->ServerIsRemote = RemoteClient;
-    ClientContext->ClientToken = NewToken;
-    return STATUS_SUCCESS;
-}
-
-/*
- * @unimplemented
+
+    /* Create client security from it */
+    Status = SepCreateClientSecurity(Token,
+                                     Qos,
+                                     RemoteClient,
+                                     TokenType,
+                                     ThreadEffectiveOnly,
+                                     ImpersonationLevel,
+                                     ClientContext);
+
+    /* Check if we failed or static tracking was used */
+    if (!(NT_SUCCESS(Status)) || (Qos->ContextTrackingMode ==
SECURITY_STATIC_TRACKING))
+    {
+        /* Dereference our copy since it's not being used */
+        ObDereferenceObject(Token);
+    }
+
+    /* Return status */
+    return Status;
+}
+
+/*
+ * @implemented
  */
 NTSTATUS
 NTAPI
@@ -326,8 +558,34 @@
                                          IN BOOLEAN ServerIsRemote,
                                          OUT PSECURITY_CLIENT_CONTEXT ClientContext)
 {
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+    PACCESS_TOKEN Token;
+    NTSTATUS Status;
+    PAGED_CODE();
+
+    /* Get the right token and reference it */
+    Token = SeQuerySubjectContextToken(SubjectContext);
+    ObReferenceObject(Token);
+
+    /* Create the context */
+    Status = SepCreateClientSecurity(Token,
+                                     ClientSecurityQos,
+                                     ServerIsRemote,
+                                     SubjectContext->ClientToken ?
+                                     TokenImpersonation : TokenPrimary,
+                                     FALSE,
+                                     SubjectContext->ImpersonationLevel,
+                                     ClientContext);
+
+    /* Check if we failed or static tracking was used */
+    if (!(NT_SUCCESS(Status)) ||
+        (ClientSecurityQos->ContextTrackingMode == SECURITY_STATIC_TRACKING))
+    {
+        /* Dereference our copy since it's not being used */
+        ObDereferenceObject(Token);
+    }
+
+    /* Return status */
+    return Status;
 }
 /*
@@ -339,23 +597,24 @@
                       IN PETHREAD ServerThread OPTIONAL)
 {
     BOOLEAN EffectiveOnly;
-
-    PAGED_CODE();
-
-    if (ClientContext->DirectlyAccessClientToken == FALSE)
-    {
+    PAGED_CODE();
+
+    /* Check if direct access is requested */
+    if (!ClientContext->DirectlyAccessClientToken)
+    {
+        /* No, so get the flag from QOS */
         EffectiveOnly = ClientContext->SecurityQos.EffectiveOnly;
     }
     else
     {
+        /* Yes, so see if direct access should be effective only */
         EffectiveOnly = ClientContext->DirectAccessEffectiveOnly;
     }
-    if (ServerThread == NULL)
-    {
-        ServerThread = PsGetCurrentThread();
-    }
-
+    /* Use the current thread if one was not passed */
+    if (!ServerThread) ServerThread = PsGetCurrentThread();
+
+    /* Call the lower layer routine */
     return PsImpersonateClient(ServerThread,
                                ClientContext->ClientToken,
                                TRUE,
@@ -373,8 +632,8 @@
 {
     PAGED_CODE();
-    SeImpersonateClientEx(ClientContext,
-                          ServerThread);
+    /* Call the new API */
+    SeImpersonateClientEx(ClientContext, ServerThread);
 }
 /* EOF */
Modified: trunk/reactos/ntoskrnl/se/sd.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/se/sd.c?rev=57261…
==============================================================================
--- trunk/reactos/ntoskrnl/se/sd.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/se/sd.c [iso-8859-1] Mon Sep 10 08:15:43 2012
@@ -27,82 +27,6 @@
 PSECURITY_DESCRIPTOR SeUnrestrictedSd = NULL;
 /* PRIVATE FUNCTIONS **********************************************************/
-
-PSID
-FORCEINLINE
-SepGetGroupFromDescriptor(PVOID _Descriptor)
-{
-    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
-    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
-
-    if (Descriptor->Control & SE_SELF_RELATIVE)
-    {
-        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
-        if (!SdRel->Group) return NULL;
-        return (PSID)((ULONG_PTR)Descriptor + SdRel->Group);
-    }
-    else
-    {
-        return Descriptor->Group;
-    }
-}
-
-PSID
-FORCEINLINE
-SepGetOwnerFromDescriptor(PVOID _Descriptor)
-{
-    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
-    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
-
-    if (Descriptor->Control & SE_SELF_RELATIVE)
-    {
-        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
-        if (!SdRel->Owner) return NULL;
-        return (PSID)((ULONG_PTR)Descriptor + SdRel->Owner);
-    }
-    else
-    {
-        return Descriptor->Owner;
-    }
-}
-
-PACL
-FORCEINLINE
-SepGetDaclFromDescriptor(PVOID _Descriptor)
-{
-    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
-    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
-
-    if (Descriptor->Control & SE_SELF_RELATIVE)
-    {
-        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
-        if (!SdRel->Dacl) return NULL;
-        return (PACL)((ULONG_PTR)Descriptor + SdRel->Dacl);
-    }
-    else
-    {
-        return Descriptor->Dacl;
-    }
-}
-
-PACL
-FORCEINLINE
-SepGetSaclFromDescriptor(PVOID _Descriptor)
-{
-    PISECURITY_DESCRIPTOR Descriptor = (PISECURITY_DESCRIPTOR)_Descriptor;
-    PISECURITY_DESCRIPTOR_RELATIVE SdRel;
-
-    if (Descriptor->Control & SE_SELF_RELATIVE)
-    {
-        SdRel = (PISECURITY_DESCRIPTOR_RELATIVE)Descriptor;
-        if (!SdRel->Sacl) return NULL;
-        return (PACL)((ULONG_PTR)Descriptor + SdRel->Sacl);
-    }
-    else
-    {
-        return Descriptor->Sacl;
-    }
-}
 BOOLEAN
 INIT_FUNCTION
Modified: trunk/reactos/ntoskrnl/se/semgr.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/se/semgr.c?rev=57…
==============================================================================
--- trunk/reactos/ntoskrnl/se/semgr.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/se/semgr.c [iso-8859-1] Mon Sep 10 08:15:43 2012
@@ -286,65 +286,6 @@
     return STATUS_SUCCESS;
 }
-static BOOLEAN
-SepSidInToken(PACCESS_TOKEN _Token,
-              PSID Sid)
-{
-    ULONG i;
-    PTOKEN Token = (PTOKEN)_Token;
-
-    PAGED_CODE();
-
-    SidInTokenCalls++;
-    if (!(SidInTokenCalls % 10000)) DPRINT1("SidInToken Calls: %d\n",
SidInTokenCalls);
-
-    if (Token->UserAndGroupCount == 0)
-    {
-        return FALSE;
-    }
-
-    for (i=0; i<Token->UserAndGroupCount; i++)
-    {
-        if (RtlEqualSid(Sid, Token->UserAndGroups[i].Sid))
-        {
-            if ((i == 0)|| (Token->UserAndGroups[i].Attributes &
SE_GROUP_ENABLED))
-            {
-                return TRUE;
-            }
-
-            return FALSE;
-        }
-    }
-
-    return FALSE;
-}
-
-static BOOLEAN
-SepTokenIsOwner(PACCESS_TOKEN Token,
-                PSECURITY_DESCRIPTOR SecurityDescriptor)
-{
-    NTSTATUS Status;
-    PSID Sid = NULL;
-    BOOLEAN Defaulted;
-
-    Status = RtlGetOwnerSecurityDescriptor(SecurityDescriptor,
-                                           &Sid,
-                                           &Defaulted);
-    if (!NT_SUCCESS(Status))
-    {
-        DPRINT1("RtlGetOwnerSecurityDescriptor() failed (Status %lx)\n",
Status);
-        return FALSE;
-    }
-
-    if (Sid == NULL)
-    {
-        DPRINT1("Owner Sid is NULL\n");
-        return FALSE;
-    }
-
-    return SepSidInToken(Token, Sid);
-}
-
 VOID
 NTAPI
 SeQuerySecurityAccessMask(IN SECURITY_INFORMATION SecurityInformation,
@@ -840,7 +781,8 @@
              SubjectSecurityContext->ClientToken :
SubjectSecurityContext->PrimaryToken;
         if (SepTokenIsOwner(Token,
-                            SecurityDescriptor))
+                            SecurityDescriptor,
+                            FALSE))
         {
             if (DesiredAccess & MAXIMUM_ALLOWED)
                 PreviouslyGrantedAccess |= (WRITE_DAC | READ_CONTROL);
@@ -1007,16 +949,16 @@
     }
     /* Set up the subject context, and lock it */
-    SubjectSecurityContext.ClientToken = Token;
-    SubjectSecurityContext.ImpersonationLevel = Token->ImpersonationLevel;
-    SubjectSecurityContext.PrimaryToken = NULL;
-    SubjectSecurityContext.ProcessAuditId = NULL;
-    SeLockSubjectContext(&SubjectSecurityContext);
+    SeCaptureSubjectContext(&SubjectSecurityContext);
+
+    /* Lock the token */
+    KeEnterCriticalRegion();
+    ExAcquireResourceSharedLite(Token->TokenLock, TRUE);
     /* 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)) // FIXME: use
CapturedSecurityDescriptor
+        if (SepTokenIsOwner(Token, SecurityDescriptor, FALSE)) // FIXME: use
CapturedSecurityDescriptor
         {
             if (DesiredAccess & MAXIMUM_ALLOWED)
                 PreviouslyGrantedAccess |= (WRITE_DAC | READ_CONTROL);
@@ -1046,8 +988,10 @@
                        AccessStatus);
     }
-    /* Unlock subject context */
-    SeUnlockSubjectContext(&SubjectSecurityContext);
+    /* Release subject context and unlock the token */
+    SeReleaseSubjectContext(&SubjectSecurityContext);
+    ExReleaseResourceLite(Token->TokenLock);
+    KeLeaveCriticalRegion();
     /* Release the captured security descriptor */
     SeReleaseSecurityDescriptor(CapturedSecurityDescriptor,