Red Hat Bugzilla – Bug 143750
console login as root fails if /etc/nologin exists
Last modified: 2007-11-30 17:10:57 EST
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Description of problem:
Logging in on console as root fails if /etc/nologin exists. Logging in by ssh is OK.
An attempt to login as root gives the following log:
Dec 21 11:52:54 bolyai26 login(pam_unix): session opened for user root by LOGIN(uid=0)
Dec 21 11:52:54 bolyai26 login: Please ignore underlying account module
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. create /etc/nologin as root (dont close shell if you can't log in by ssh)
Authentication was set by system-config-authentication to shadow, MD5 passwords.
I've verified this behaviour - I think it may be more of a PAM thing.
This is a nice one - actually there are 2 bugs - in pam library for
allowing the PAM_IGNORE status to get to an application and in the
pam_nologin (overwriting return value by return of pam_get_item).
The openssh works because it doesn't test return value of pam_setcred
and it handles the /etc/nologin file on its own.
I've fixed this in UPSTREAM CVS, however I plan to add it to the next
FC3 errata too.
Actually this isn't a security bug.