given the way sssd is designed, if we could restrict in IPA to a list, sssd 
could map anything that’s not on the local system to a fallback. But sssd isn’t 
set up so that random typos can get mapped to a fallback.

> On Jan 25, 2018, at 3:17 PM, Charles Hedrick via FreeIPA-users 
> <freeipa-users@lists.fedorahosted.org> wrote:
> 
> ugh. valid_shells is carefully designed so it can’t be used for this. But 
> doing it in sshd is probably the right answer.
> 
>> On Jan 25, 2018, at 3:15 PM, Charles Hedrick via FreeIPA-users 
>> <freeipa-users@lists.fedorahosted.org> wrote:
>> 
>> looks like the real solution is valid_shells in sssd.conf. That will prevent 
>> people from damaging themselves.
>> 
>>> On Jan 25, 2018, at 3:12 PM, Rob Crittenden <rcrit...@redhat.com> wrote:
>>> 
>>> Charles Hedrick via FreeIPA-users wrote:
>>>> One of my staff made a typo in his shell in “ipa user-mod —shell” It can 
>>>> be hard to recover from, since you can’t login.
>>>> 
>>>> Is there a way to restrict what they can use? Traditionally only shells in 
>>>> /etc/shells were valid.
>>> 
>>> There is no way currently.
>>> 
>>> Note that part of the problem is which /etc/shells to use? Remember that
>>> IPA is centralized and users may be using a number of different
>>> operating systems. This is why the default shell is /bin/sh, because it
>>> is nearly universal.
>>> 
>>> It probably isn't a ton of work to add a new config option to provide a
>>> set of valid shells so feel free to file an RFE I just don't know that
>>> this sort of thing would be prioritized.
>>> 
>>> We could probably help if you want to contribute something.
>>> 
>>> rob
>> 
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