** Also affects: adsys (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: adsys (Ubuntu Jammy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1982347
Title:
Username is case sensitive when applying policies on login
Status in adsys package in Ubuntu:
New
Status in adsys source package in Focal:
New
Status in adsys source package in Jammy:
New
Bug description:
[Impact]
When logging in (either via login or ssh) to an AD account using
different case combinations, adsysd uses the specified account name
instead of the lowercase one reported by getent/whoami to apply the
GPOs. I believe this comes from the pam_get_item call here:
https://github.com/ubuntu/adsys/blob/e3316e5e37970a07f09fa6df553ddac096c91255/pam/pam_adsys.c#L266
This works but has the unintended side effect of producing multiple
dconf profile files for each variant of the username, and caching
policies as well:
root@ubuntu2204:~# ls /etc/dconf/profile/ | grep -i administrator
[email protected]
[email protected]
[email protected]
root@ubuntu2204:~# ls /var/cache/adsys/policies/ | grep -i administrator
[email protected]
[email protected]
[email protected]
Of course this all stems from the username retrieved by PAM so there
might be more unintended side-effects, the dconf one being the easiest
to observe.
To ensure an unified experience, when a target name is normalized from
e.g. DOMAIN\User to User@DOMAIN, it will also be lowercased.
[Test Plan]
Reproduction:
* With adsys set up, log in on the Ubuntu client using an AD account,
alternating cases
* Observe multiple files created at /var/cache/adsys/policies
With the fix applied, remove *all* cached policies at
/var/cache/adsys/policies and attempt to login with different case
combinations of the AD account, e.g.:
[email protected]
[email protected]
[email protected]
[email protected]
As root, check the contents of /var/cache/adsys/policies - you should
only see a lowercase entry: [email protected]
[Where problems could occur]
Target name normalization is exercised by the code that dumps policies
applied for a given user, and by the code that updates or creates a
policy for a given user. If this happens to cause a bug, it will
render the core part of adsys unusable.
We believe this is highly unlikely given that in some cases, adsys
already used the lowercase variant of the username to apply and
display policies.
[Other Info]
This issue was initially reported on GitHub at
https://github.com/ubuntu/adsys/issues/378
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