[erlang-patches] SNMP/VACM: bugfix for vacmViewTreeFamilyMask

Stefan Zegenhagen stefan.zegenhagen@REDACTED
Mon Jun 10 11:07:00 CEST 2013


Dear all,


it's almost a year since I sent the patch attached to this e-mail, and I
just found out that I have not yet gotten a response to it.

I would consider this patch important because it fixes an issue with the
interpretation of data that might be critical for SNMPv3 operation. I
confirmed at that time that erlangs interpretation of
vacmViewTreeFamilyMask is indeed not interoperable with other SNMP
stacks.


Kind regards,


> > > the implementation of SNMP-VIEW-BASED-ACM.mib assumes that the input for
> > > vacmViewTreeFamilyMask is an OID consisting of 1's and 0's only to form
> > > the mask. However, the MIB states that the input should be a bitstring.
> > > 
> > > The OID representation of the mask is useful in the code as it speeds up
> > > time-critical code paths when checking access permissions for EACH SNMP
> > > access. Reading/writing the view mask objects is less time-critical.
> > > 
> > > Therefore, to fix the issue, convert between OID representation and
> > > bitstring when the vacmViewTreeFamilyMask objects are accessed. This is
> > > done by the patch attached to this e-mail.
> 
> 
> I'm very sorry for the troubles that I am causing but it seems that the
> previous version of the patch did more than it should: the OID-bitstring
> conversion was also applied to other tables in the same MIB on
> get/get-next requests.
> 
> The version of the patch that is attached to this e-mail restricts the
> OID-bitstring conversion to vacmViewTreeFamilyMask alone.


-- 
Dr. Stefan Zegenhagen

arcutronix GmbH
Garbsener Landstr. 10
30419 Hannover
Germany

Tel:   +49 511 277-2734
Fax:   +49 511 277-2709
Email: stefan.zegenhagen@REDACTED
Web:   www.arcutronix.com

*Synchronize the Ethernet*

General Managers: Dipl. Ing. Juergen Schroeder, Dr. Josef Gfrerer -
Legal Form: GmbH, Registered office: Hannover, HRB 202442, Amtsgericht
Hannover; Ust-Id: DE257551767.

Please consider the environment before printing this message.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-bugfix-for-vacmViewTreeFamilyMask.patch
Type: text/x-patch
Size: 4709 bytes
Desc: not available
URL: <http://erlang.org/pipermail/erlang-patches/attachments/20130610/4e123aec/attachment.bin>


More information about the erlang-patches mailing list