Re: [PATCH v1 0/4] nfs-utils changes for RPC-with-TLS server

[Steve Dickson <steved@redhat.com>]

On 3/23/23 2:01 PM, Chuck Lever III wrote:
> 
> 
>> On Mar 23, 2023, at 1:57 PM, Steve Dickson <steved@redhat.com> wrote:
>>
>>
>>
>> On 3/21/23 7:52 AM, Jeff Layton wrote:
>>> On Mon, 2023-03-20 at 10:35 -0400, Chuck Lever wrote:
>>>> Hi Steve-
>>>>
>>>> This is server-side support for RPC-with-TLS, to accompany similar
>>>> support in the Linux NFS client. This implementation can support
>>>> both the opportunistic use of transport layer security (it will be
>>>> used if the client cares to) and the required use of transport
>>>> layer security (the server requires the client to use it to access
>>>> a particular export).
>>>>
>>>> Without any other user space componentry, this implementation will
>>>> be able to handle clients that request the use of RPC-with-TLS. To
>>>> support security policies that restrict access to exports based on
>>>> the client's use of TLS, modifications to exportfs and mountd are
>>>> needed. These can be found here:
>>>>
>>>> git://git.linux-nfs.org/projects/cel/nfs-utils.git
>>>>
>>>> They include an update to exports(5) explaining how to use the new
>>>> "xprtsec=" export option.
>>>>
>>>> The kernel patches, along with the the handshake upcall, are carried
>>>> in the topic-rpc-with-tls-upcall branch available from:
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git
>>>>
>>>> This was posted under separate cover.
>>>>
>>>> ---
>>>>
>>>> Chuck Lever (4):
>>>>        libexports: Fix whitespace damage in support/nfs/exports.c
>>>>        exports: Add an xprtsec= export option
>>>>        exportfs: Push xprtsec settings to the kernel
>>>>        exports.man: Add description of xprtsec= to exports(5)
>>>>
>>>>
>>>>   support/export/cache.c       |  15 ++++++
>>>>   support/include/nfs/export.h |   6 +++
>>>>   support/include/nfslib.h     |  14 +++++
>>>>   support/nfs/exports.c        | 100 ++++++++++++++++++++++++++++++++---
>>>>   utils/exportfs/exportfs.c    |   1 +
>>>>   utils/exportfs/exports.man   |  45 +++++++++++++++-
>>>>   6 files changed, 172 insertions(+), 9 deletions(-)
>>>>
>>> Nice work, Chuck! This all looks pretty straightforward. I have a
>>> (minor) concern about potentially blocking nfsd threads for up to 20s in
>>> a handshake, but this seems like a good place to start.
>> Yes! But Will here be a V2 with the suggested changes?
> 
> I've done the suggested updates in my private tree already, so I can post a refresh soon.
Fair enough.
> 
> 
>> It would be good to get a new release with these patches
>> in before the upcoming Bakeathon.
> 
> The concept and operation of xprtsec= is pretty new... would there be a problem if all this were to change significantly after community review?
Not a problem at all! I was just thinking about get the patches into
Fedora rawhide to get some testing...

steved.

> 
> --
> Chuck Lever
> 
>