For a minifilter’s function to open a file or directory with FltCreateFile() call, the function can get all parameters info from the FLT_CALLBACK_DATA, and PCFLT_RELATED_OBJECTS structures passed in by the Filter Manager, except the “__in ACCESS_MASK DesiredAccess” parameter. I suppose that the function can construct the correct DesireAccesss from the FLT_PARAMETERS.Create.Options variable. But the logic and codes could be lengthy because of so many different Options. Would it be nice if the function can get the “ACCESS_MASK DesiredAccess” from the CALLBACK_DATA or PCFLT_RELATED_OBJECTS structures and just pass it down to lower layer? or is there a better way to handle this?
This problem also apply to ObReferenceObjectByHandle() function call.
Are you just looking for the desired access in pre-create? If so, you get it
via the SecurityContext in the FLT_PARAMETERS.
http://msdn.microsoft.com/en-us/library/ff544687(VS.85).aspx
-scott
–
Scott Noone
Consulting Associate
OSR Open Systems Resources, Inc.
http://www.osronline.com
wrote in message news:xxxxx@ntfsd…
> For a minifilter’s function to open a file or directory with
> FltCreateFile() call, the function can get all parameters info from the
> FLT_CALLBACK_DATA, and PCFLT_RELATED_OBJECTS structures passed in by the
> Filter Manager, except the “__in ACCESS_MASK DesiredAccess” parameter. I
> suppose that the function can construct the correct DesireAccesss from the
> FLT_PARAMETERS.Create.Options variable. But the logic and codes could be
> lengthy because of so many different Options. Would it be nice if the
> function can get the “ACCESS_MASK DesiredAccess” from the CALLBACK_DATA or
> PCFLT_RELATED_OBJECTS structures and just pass it down to lower layer? or
> is there a better way to handle this?
> This problem also apply to ObReferenceObjectByHandle() function call.
>
>
Thanks, Scott.
This is what I am looking for.
John W.
Are you just looking for the desired access in pre-create? If so, you get
it
via the SecurityContext in the FLT_PARAMETERS.http://msdn.microsoft.com/en-us/library/ff544687(VS.85).aspx
-scott
–
Scott Noone
Consulting Associate
OSR Open Systems Resources, Inc.
http://www.osronline.comwrote in message news:xxxxx@ntfsd…
>> For a minifilter’s function to open a file or directory with
>> FltCreateFile() call, the function can get all parameters info from the
>> FLT_CALLBACK_DATA, and PCFLT_RELATED_OBJECTS structures passed in by the
>> Filter Manager, except the “__in ACCESS_MASK DesiredAccess” parameter.
>> I
>> suppose that the function can construct the correct DesireAccesss from
>> the
>> FLT_PARAMETERS.Create.Options variable. But the logic and codes could be
>> lengthy because of so many different Options. Would it be nice if the
>> function can get the “ACCESS_MASK DesiredAccess” from the CALLBACK_DATA
>> or
>> PCFLT_RELATED_OBJECTS structures and just pass it down to lower layer?
>> or
>> is there a better way to handle this?
>> This problem also apply to ObReferenceObjectByHandle() function call.
>>
>>
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Twin Peaks Software
Innovation for business continuity
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