[ros-diffs] [ion] 25368: - Implement ObCheckCreateObjectAccess, ObpCheckTraverseAccess, ObpCheckObjectReference. These APIs are not used yet but are all very similar to ObCheckObjectAccess. There are used at different places by Ob to make sure that the current token and access rights permits some privileged operations such as directory traversal, object referencing and object creation.

Author: ion
Date: Mon Jan  8 10:46:17 2007
New Revision: 25368

URL: http://svn.reactos.org/svn/reactos?rev=25368&view=rev
Log:
- Implement ObCheckCreateObjectAccess, ObpCheckTraverseAccess, ObpCheckObjectReference.
These APIs are not used yet but are all very similar to ObCheckObjectAccess. There are
used at different places by Ob to make sure that the current token and access rights
permits some privileged operations such as directory traversal, object referencing and
object creation.

Modified:
    trunk/reactos/ntoskrnl/ob/obsecure.c

Modified: trunk/reactos/ntoskrnl/ob/obsecure.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ob/obsecure.c?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/ob/obsecure.c (original)
+++ trunk/reactos/ntoskrnl/ob/obsecure.c Mon Jan  8 10:46:17 2007
@@ -11,9 +11,208 @@
 
 #include <ntoskrnl.h>
 #define NDEBUG
-#include <internal/debug.h>
+#include <debug.h>
 
 /* PRIVATE FUNCTIONS *********************************************************/
+
+BOOLEAN
+NTAPI
+ObCheckCreateObjectAccess(IN PVOID Object,
+                          IN ACCESS_MASK CreateAccess,
+                          IN PACCESS_STATE AccessState,
+                          IN PUNICODE_STRING ComponentName,
+                          IN BOOLEAN LockHeld,
+                          IN KPROCESSOR_MODE AccessMode,
+                          OUT PNTSTATUS AccessStatus)
+{
+    POBJECT_HEADER ObjectHeader;
+    POBJECT_TYPE ObjectType;
+    PSECURITY_DESCRIPTOR SecurityDescriptor;
+    BOOLEAN SdAllocated;
+    BOOLEAN Result = TRUE;
+    ACCESS_MASK GrantedAccess = 0;
+    PPRIVILEGE_SET Privileges = NULL;
+    NTSTATUS Status;
+    PAGED_CODE();
+
+    /* Get the header and type */
+    ObjectHeader = OBJECT_TO_OBJECT_HEADER(Object);
+    ObjectType = ObjectHeader->Type;
+
+    /* Get the security descriptor */
+    Status = ObGetObjectSecurity(Object, &SecurityDescriptor, &SdAllocated);
+    if (!NT_SUCCESS(Status))
+    {
+        /* We failed */
+        *AccessStatus = Status;
+        return FALSE;
+    }
+
+    /* Lock the security context */
+    SeLockSubjectContext(&AccessState->SubjectSecurityContext);
+
+    /* Check if we have an SD */
+    if (SecurityDescriptor)
+    {
+        /* Now do the entire access check */
+        Result = SeAccessCheck(SecurityDescriptor,
+                               &AccessState->SubjectSecurityContext,
+                               TRUE,
+                               CreateAccess,
+                               0,
+                               &Privileges,
+                               &ObjectType->TypeInfo.GenericMapping,
+                               AccessMode,
+                               &GrantedAccess,
+                               AccessStatus);
+        if (Privileges)
+        {
+            /* We got privileges, append them to the access state and free them */
+            Status = SeAppendPrivileges(AccessState, Privileges);
+            SeFreePrivileges(Privileges);
+        }
+    }
+
+    /* We're done, unlock the context and release security */
+    SeUnlockSubjectContext(&AccessState->SubjectSecurityContext);
+    ObReleaseObjectSecurity(SecurityDescriptor, SdAllocated);
+    return Result;
+}
+
+BOOLEAN
+NTAPI
+ObpCheckTraverseAccess(IN PVOID Object,
+                       IN ACCESS_MASK TraverseAccess,
+                       IN PACCESS_STATE AccessState OPTIONAL,
+                       IN BOOLEAN LockHeld,
+                       IN KPROCESSOR_MODE AccessMode,
+                       OUT PNTSTATUS AccessStatus)
+{
+    POBJECT_HEADER ObjectHeader;
+    POBJECT_TYPE ObjectType;
+    PSECURITY_DESCRIPTOR SecurityDescriptor;
+    BOOLEAN SdAllocated;
+    BOOLEAN Result;
+    ACCESS_MASK GrantedAccess = 0;
+    PPRIVILEGE_SET Privileges = NULL;
+    NTSTATUS Status;
+    PAGED_CODE();
+
+    /* Get the header and type */
+    ObjectHeader = OBJECT_TO_OBJECT_HEADER(Object);
+    ObjectType = ObjectHeader->Type;
+
+    /* Get the security descriptor */
+    Status = ObGetObjectSecurity(Object, &SecurityDescriptor, &SdAllocated);
+    if (!NT_SUCCESS(Status))
+    {
+        /* We failed */
+        *AccessStatus = Status;
+        return FALSE;
+    }
+
+    /* Lock the security context */
+    SeLockSubjectContext(&AccessState->SubjectSecurityContext);
+
+    /* Now do the entire access check */
+    Result = SeAccessCheck(SecurityDescriptor,
+                           &AccessState->SubjectSecurityContext,
+                           TRUE,
+                           TraverseAccess,
+                           0,
+                           &Privileges,
+                           &ObjectType->TypeInfo.GenericMapping,
+                           AccessMode,
+                           &GrantedAccess,
+                           AccessStatus);
+    if (Privileges)
+    {
+        /* We got privileges, append them to the access state and free them */
+        Status = SeAppendPrivileges(AccessState, Privileges);
+        SeFreePrivileges(Privileges);
+    }
+
+    /* We're done, unlock the context and release security */
+    SeUnlockSubjectContext(&AccessState->SubjectSecurityContext);
+    ObReleaseObjectSecurity(SecurityDescriptor, SdAllocated);
+    return Result;
+}
+
+BOOLEAN
+NTAPI
+ObpCheckObjectReference(IN PVOID Object,
+                        IN OUT PACCESS_STATE AccessState,
+                        IN BOOLEAN LockHeld,
+                        IN KPROCESSOR_MODE AccessMode,
+                        OUT PNTSTATUS AccessStatus)
+{
+    POBJECT_HEADER ObjectHeader;
+    POBJECT_TYPE ObjectType;
+    PSECURITY_DESCRIPTOR SecurityDescriptor;
+    BOOLEAN SdAllocated;
+    BOOLEAN Result;
+    ACCESS_MASK GrantedAccess = 0;
+    PPRIVILEGE_SET Privileges = NULL;
+    NTSTATUS Status;
+    PAGED_CODE();
+
+    /* Get the header and type */
+    ObjectHeader = OBJECT_TO_OBJECT_HEADER(Object);
+    ObjectType = ObjectHeader->Type;
+
+    /* Get the security descriptor */
+    Status = ObGetObjectSecurity(Object, &SecurityDescriptor, &SdAllocated);
+    if (!NT_SUCCESS(Status))
+    {
+        /* We failed */
+        *AccessStatus = Status;
+        return FALSE;
+    }
+
+    /* Lock the security context */
+    SeLockSubjectContext(&AccessState->SubjectSecurityContext);
+
+    /* Now do the entire access check */
+    Result = SeAccessCheck(SecurityDescriptor,
+                           &AccessState->SubjectSecurityContext,
+                           TRUE,
+                           AccessState->RemainingDesiredAccess,
+                           AccessState->PreviouslyGrantedAccess,
+                           &Privileges,
+                           &ObjectType->TypeInfo.GenericMapping,
+                           AccessMode,
+                           &GrantedAccess,
+                           AccessStatus);
+    if (Result)
+    {
+        /* Update the access state */
+        AccessState->RemainingDesiredAccess &= ~GrantedAccess;
+        AccessState->PreviouslyGrantedAccess |= GrantedAccess;
+    }
+
+    /* Check if we have an SD */
+    if (SecurityDescriptor)
+    {
+        /* Do audit alarm */
+#if 0
+        SeObjectReferenceAuditAlarm(&AccessState->OperationID,
+                                    Object,
+                                    SecurityDescriptor,
+                                    &AccessState->SubjectSecurityContext,
+                                    AccessState->RemainingDesiredAccess |
+                                    AccessState->PreviouslyGrantedAccess,
+                                    ((PAUX_DATA)(AccessState->AuxData))->
+                                    PrivilegeSet,
+                                    Result,
+                                    AccessMode);
+#endif
+    }
+
+    /* We're done, unlock the context and release security */
+    SeUnlockSubjectContext(&AccessState->SubjectSecurityContext);
+    ObReleaseObjectSecurity(SecurityDescriptor, SdAllocated);
+    return Result;
+}
 
 /*++
 * @name ObCheckObjectAccess
@@ -26,7 +225,7 @@
 * @param AccessState
 *        <FILLMEIN>
 *
-* @param Unknown
+* @param LockHeld
 *        <FILLMEIN>
 *
 * @param AccessMode
@@ -44,7 +243,7 @@
 NTAPI
 ObCheckObjectAccess(IN PVOID Object,
                     IN OUT PACCESS_STATE AccessState,
-                    IN BOOLEAN Unknown,
+                    IN BOOLEAN LockHeld,
                     IN KPROCESSOR_MODE AccessMode,
                     OUT PNTSTATUS ReturnedStatus)
 {
@@ -93,7 +292,7 @@
                            ReturnedStatus);
     if (Privileges)
     {
-        /* We got privileges, append them to teh access state and free them */
+        /* We got privileges, append them to the access state and free them */
         Status = SeAppendPrivileges(AccessState, Privileges);
         SeFreePrivileges(Privileges);
     }