[cifs-protocol] CAR: userParameters attribute

[tridge at samba.org]

Dear Dochelp,

The userParameters attribute on a user in AD seems to be a bit of a
puzzle. Could you add some docs on it at some stage? Not a really high
priority, but we would eventually like to be able to offer admin tools
that manage things like session activity timeouts, and it seems that
we need to know how to parse and create userParameters to do that.

An example userParameters attribute from w2k8r2 (in base64 form) is this:

userParameters:: Q3R4Q2ZnUHJlc2VudCAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgI
  CAgUAsaCAFDdHhDZmdQcmVzZW5045S15pSx5oiw44GiIAIBQ3R4V0ZQcm9maWxlUGF0aOOAsBgCAU
  N0eFdGSG9tZURpcuOAsCICAUN0eFdGSG9tZURpckRyaXZl44CwEggBQ3R4U2hhZG9344Sw44Cw44C
  w44CwLggBQ3R4TWF4RGlzY29ubmVjdGlvblRpbWXjgaXjjLnjkLDjgLAoCAFDdHhNYXhDb25uZWN0
  aW9uVGltZeOAtOOct+aIseOAsBwIAUN0eE1heElkbGVUaW1l44Gj45yy46Sw44CwIAIBQ3R4V29ya
  0RpcmVjdG9yeeOAsBgIAUN0eENmZ0ZsYWdzMeOAsOOBpuOYsuOAuCICAUN0eEluaXRpYWxQcm9ncm
  Ft44Cw

the above came from using the windows user admin tool to change the
session activity timeout for a test user.

Michael Ströder has also pointed out this page:

  http://daduke.org/linux/userparameters.html

which documents a previous effort by the Linux thin client community
to work out the format of userParameters. I'm guessing the strange
encoding is used to try to keep the attribute as valid UTF8. If you
can confirm that the attribute is always valid UTF8 that would be
great (as otherwise we might corrupt it during replication with
windows).

As I mentioned, this is not a high priority, but it would be nice to
know the format at some stage.

Cheers, Tridge