[OpenAFS-devel] Initial implementation of RestrictedQuery, please comment

[Jeffrey Altman]

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On 3/18/2014 10:38 AM, Jeffrey Hutzelman wrote:
> On Tue, 2014-03-18 at 09:29 -0400, Jeffrey Altman wrote:
>=20
>>>     - of course you can't access membership listing and other ptserve=
r stuff.
>>
>> Fyi, self service group membership management is one of the hallmarks =
of
>> AFS.  Restricting access to system:authuser + foreign is necessary if
>> you wish to permit users to define and manage personal groups.
>=20
> However, this is much easier to do in the ptserver, which owns the PRDB=

> and already uses PRDB lookups as part of its authorization process, tha=
n
> it would be in the volserver or vlserver, which have no relationship
> with the ptserver (and for which requiring such a relationship could be=

> operationally undesirable).

My 2012 proposal that was referenced in the first e-mail assumes that
a relationship between the volserver and vlserver to the protection
database would happen.  Otherwise, it isn't possible to provide ACLs on
entries to control different levels of access.

>> Its not that complicated unless you want to set separate permissions f=
or
>> each remote Kerberos realm.  If the levels are authuser localonly and
>> authuser remote then the difference is a test for membership in
>> system:authuser or a test for a non-anonymous AFS ID.
>=20
> A volserver or vlserver cannot easily test for membership in
> system:authuser, and does not know the client's AFS ID.  Changing this
> would be a _much_ more complex patch, since it would require something
> analogous to the fileserver's hpr package.

The HPR package can be turned into a library which could be linked to
the other services.


>>> I also have some new questions, maybe a bit controversial:
>>>
>>>   - would anything break if we wouldn't return the volume name when t=
he
>>>     GetVolumeByID is used if you're unauthenticated?
>>
>> Yes.  Cache managers that lookup volume group data by ID would not be
>> able to hash the data by the name.   This would result in multiple
>> volume group entries for the same volume group in the Windows cache
>> manager.  There would be negative impacts on volume callback processin=
g.
>=20
> Cache managers are supposed to look up volume group data by name, not
> ID.  This is why VL_GetEntryByName*() support lookups of "names" that
> look like volume IDs.  The UNIX cache manager behaves this way and
> always has (or at least, it has since there _was_ a separate volume
> location service).  Does Windows do this differently?

The Windows cache manager stores whole volume groups and hashes the
entries for lookup by volume group name, RW ID, RO ID, and BK ID.  The
cache manager is responsible for mount point evaluation.  However, at
the IFS layer paths are translated to volume IDs and file IDs.  Mount
points and symlinks are exposed to applications as Windows Reparse
Points and each volume is an independent volume object with a root
directory that doesn't have a parent.  This is a sharp distinction from
the Unix CM.

The volumes and files that are known to the IFS via the afs redirector
do not necessarily have a one to one mapping with objects that are
present in the AFS cache.  Objects that be evicted from the AFS cache
while they are still in use by the IFS.  In this case a volume query or
a file query may be presented to the AFS cache manager by ID and the AFS
cache manager will have to query the volume location database by ID to
retrieve the data.   The CM will use VL_GetEntryByName* to do so.

>> Reviews should be performed in Gerrit.
>=20
> Reasonably complete patches should be submitted to Gerrit for review an=
d
> integration.  Design discussion is more appropriate on this mailing lis=
t
> than in review comments in Gerrit, which are terrible as a
> general-purpose discussion medium.  This thread is just crossing the
> boundary from one to the other, _if_ we assume general agreement on the=

> scope of the change (for example, not adding features that would requir=
e
> PRDB lookups in the volserver or vlserver).

The recommendation was to use Gerrit because a working patch was
provided for review in github.  If reviews of the patch are to take
place, it would be best that they be done in Gerrit.

> However, I should point out that discussions regarding making semantic
> changes to RPCs, _especially_ when those RPCs are used by cache manager=
s
> and other AFS client implementations, belong on the afs3-standardizatio=
n
> list, not here.  The readership of the two lists is not the same, and a=

> message sent there raising the possibility of locking down RPCs that ma=
y
> be used by clients could well raise objections that would not be
> mentioned here.  For example, the author of afscp, which was mentioned
> earlier in this thread, follows that list, but I don't think he pays
> attention to this one nearly as often.

Semantics changes to RPCs in general should not take place.  New RPCs
should be issued if the behavior of the RPC is going to be modified.
Such discussions do belong in afs3-standardization if those RPCs involve
cache manager interactions.   If the RPCs are in the group of those RPCs
that are considered to be administrative or server to server, then they
do not necessarily fall under the afs3-standardization process.

Jeffrey Altman



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