[lustre-discuss] shared key security - issue with kernel key possession?

Jeremy Filizetti jeremy.filizetti at gmail.com
Thu Feb 27 11:32:17 PST 2020

Do you have hostname associated with the IP address so when you do a
reverse lookup it resolves the hostname?


On Thu, Feb 27, 2020, 11:41 AM Steve Brasier <steveb at stackhpc.com> wrote:

> Thanks Jeremy. I will file a bug - I've confirmed that if I'm actually
> ssh'd in as root then `keyctl read` can read the keys created by `mount -t
> lustre ... -o skpath=<securedir>`. So that's definitely an issue.
> However, using this workaround of actually logging in as root I now get
> the following when trying to mount:
> lustre-admin lgss_keyring: [11142]:ERROR:lgss_get_service_str(): cannot
> resolve hostname from nid 20001c0a8290a
> The only reference <https://jira.whamcloud.com/browse/LU-10593>I can find
> to this error is IB networks where the interconnect doesn't have an IP.
> That's not the issue here and I can `lnetctl ping` the mgs by NID.
> Is there some config I'm missing?
> many thanks
> Steve
> http://stackhpc.com/
> Please note I work Tuesday to Friday.
> On Wed, 26 Feb 2020 at 00:42, Jeremy Filizetti <jeremy.filizetti at gmail.com>
> wrote:
>> This is a known issue.  I've had this issue pop up after several days for
>> no apparent reason.  At this point I'm thinking the keyring will need to be
>> configurable to provide a workaround.  Ideally the keys would be added to a
>> Lustre specific keyring so everything would be cleaned up when the modules
>> are removed  However, the problem there is they need to be loaded before
>> the mount system call.
>> Please file a bug if you have a chance.
>> Jeremy
>> On Tue, Feb 25, 2020 at 6:18 AM Steve Brasier <steveb at stackhpc.com>
>> wrote:
>>> Hi all,
>>> I'm trying to configure a lustre 2.12.2 system with SSK and I believe I
>>> have a problem with kernel keys which I'd be grateful for any suggestions
>>> on.
>>> Essentially I have followed the instructions/examples in the docs for
>>> SSK except that:
>>> - A host "lustre-storage" hosts the MGS, MDT and OST with the fileystem
>>> "test_fs1".
>>> - A host "lustre-client1" is in a nodeset "lustre_client1".
>>> -  cli2ost and cli2mdt rules set as skn
>>> (happy to provide more details if required but I think that's the major
>>> differences from the examples)
>>> Trying to mount the filesystem from the client fails:
>>> [centos at lustre-client1 ~]$ sudo mount -t lustre at tcp1:/test_fs1
>>> -o skpath=/etc/lustre /mnt/lustre/test_fs1/
>>> mount.lustre: mount at tcp1:/test_fs1 at
>>> /mnt/lustre/test_fs1 failed: Connection refused
>>> Looking in /var/log/messages I can see:
>>> lustre-client1 lgss_keyring: [18756]:ERROR:sk_create_cred():
>>> keyctl_read() failed for key 1073636326: Permission denied
>>> And in fact there is a problem reading this key:
>>> [centos at lustre-client1 ~]$ sudo keyctl list @u
>>> 1 key in keyring:
>>> 1073636326: --alswrv     0     0 user: lustre:test_fs1
>>> [centos at lustre-client1 ~]$ sudo keyctl read 1073636326
>>> keyctl_read_alloc: Permission denied
>>> If I try to create a key myself I can see it has the same permissions
>>> as  1073636326, and again reading it fails. Some googling led me to this
>>> <https://mjg59.dreamwidth.org/37333.html> which suggests there's a
>>> fundamental problem using sudo with kernel keys *. I can't be the only
>>> person to try to deploy lustre using sudo though surely? So there must be
>>> something I'm missing here to make this work.
>>> To work around this I tried including "user" in the /etc/fstab options
>>> then mounting as a normal user but that fails:
>>> [centos at lustre-client1 ~]$ mount /mnt/lustre/test_fs1/
>>> mount.lustre: mount at tcp1:/test_fs1 at
>>> /mnt/lustre/test_fs1 failed: Operation not permitted
>>> and in fact it appears lustre doesn't support the user option?
>>> Feb 25 11:12:27 lustre-client1 kernel: LustreError: 152-6: Unknown
>>> option 'user', won't mount.
>>> As I said any help appreciated!
>>> Steve
>>> * Although that link says key possession is tied to the original user,
>>> which would suggest that the key should show up in centos's keyring, which
>>> it doesn't.
>>> http://stackhpc.com/
>>> Please note I work Tuesday to Friday.
>>>> _______________________________________________
>>> lustre-discuss mailing list
>>> lustre-discuss at lists.lustre.org
>>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
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