De : Jakub Hrozek [mailto:firstname.lastname@example.org]
Envoyé : mercredi 16 janvier 2019 16:03
À : sssd-users(a)lists.fedorahosted.org
Objet : [SSSD-users] Re: Understanding sssd cache
On Wed, Jan 16, 2019 at 03:50:59PM +0100, Maupertuis Philippe wrote:
> > -----Message d'origine-----
> > De : Jakub Hrozek [mailto:email@example.com]
> > Envoyé : mercredi 16 janvier 2019 15:24
> > À : sssd-users(a)lists.fedorahosted.org
> > Objet : [SSSD-users] Re: Understanding sssd cache
> > On Wed, Jan 16, 2019 at 01:45:35PM +0100, Maupertuis Philippe wrote:
> > >
> > >
> > > > -----Message d'origine-----
> > > > De : Lukas Slebodnik [mailto:firstname.lastname@example.org]
> > > > Envoyé : mercredi 16 janvier 2019 12:47
> > > > À : End-user discussions about the System Security Services Daemon
> > > > Objet : [SSSD-users] Re: Understanding sssd cache
> > > >
> > > > On (16/01/19 09:14), Maupertuis Philippe wrote:
> > > > >Hi
> > > > >I am trying to find out how th sssd cache is being populated.
> > > > >I couldn't find much about it so I did some tests.
> > > > >It seems that with enumerate = true, the cache holds all the
> > > > needed as soon as sssd is started.
> > > > >With enumerate = false, the cache holds information about
> > only
> > > > after his first connection.
> > > > >Is that right ?
> > > > >I would like to be sure that user's passwords are stored in
> > > > couldn't find any way to verify this
> > > > >With sssctl user-show I can find if a user is in the cache but
> > details.
> > > > >With sssctl user-checks I get some information about the user
> > nothing
> > > > about the password.
> > > > >By examining directly the cache with ldbsearch I don't find
> > > > information either, only maybe shadowLastChange: with a number
> > I
> > > > don't understand.
> > > > >Is there any documentation about the cache management ?
> > > > >
> > > >
> > > > Hashed password is cached only after successful authentication. It
> > > > rerieved by "getent passwd $user".
> > > >
> > > > sssd cache is internal cache and should not be used directly by
> > > I understand that and was looking at it only to try to understand how it
> > works.
> > >
> > > > May I know what do you want to achieve?
> > > When using regular ssh access the the ssh publickey is in the cache if
> > needed.
> > > A user who had not connected previously is able to connect even if the
> > backend is unreachable
> > > When using the console, we have to rely on the password.
> > > When something goes wrong (sshd down or network issue), there is a
> > probability that the user would connect to the console for the first time.
> > > So if there is no guarantee the login could be successful offline we
> > have a local (shared) account to connect to the console.
> > > A shared account is a nightmare to manage and a sore point for audits,
> > would like to remove it.
> > The sss_seed tool was meant as a way to mitigate this.
> If I understand it correctly to have only nominative account in place for
console login, each user would have to put his own password in the cache
before something goes wrong.
> Obviously it won't work in a large environment.
> So we can't rely on SSSD and its cache for console login, a local user is
If you're going to orchestrate useradd for each local user, how is that
more difficult than sss_seed for each remote user?
Maybe I am missing something but sss_seed requires a password.
Only the user itself can provide a password for himself , even a temporary one otherwise
he can pretend it was not him who did evil things.
And sss_seed would be needed for all remote users.
I just need one local user (and I have already root) for which I must manage the password
according to the various security standards we are subject to.
Managing the root password is not exactly a piece of cake, I was hoping to get rid of
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