Bug 182337 – openssh should not use redundant pam_nologin

Bug 182337 - openssh should not use redundant pam_nologin

Summary:	openssh should not use redundant pam_nologin

Status:	CLOSED DEFERRED

Aliases:	None

Product:	Red Hat Enterprise Linux 4
Classification:	Red Hat
Component:	openssh (Show other bugs)
Sub Component:
Version:	4.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Tomas Mraz
QA Contact:	Brian Brock
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Reported:	2006-02-21 16:55 EST by Brad Smith
Modified:	2007-11-30 17:07 EST (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2006-02-21 17:23:27 EST
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Description Brad Smith 2006-02-21 16:55:07 EST

sshd honors /etc/nologin without any assistance from PAM and yet /etc/pam.d/sshd
includes pam_nologin. This is problematic for two reasons:

1) Users may assume that removing pam_nologin from pam.d/sshd will cause sshd to
ignore /etc/nologin, but this is not the case.

2) When a login is stopped via pam_nologin, sshd fails to print the contents of
/etc/nologin. If pam_nologin is removed from /etc/pam.d/sshd then the contents
of /etc/nologin are printed as expected.

Comment 1 Tomas Mraz 2006-02-21 17:23:27 EST

This problem is solved in current OpenSSH package in FC5 development. But it is
solved the other way around - the internal sshd processing of /etc/nologin is
not used when UsePAM is set to 'yes'. The problem 2) is solved by moving
pam_nologin.so to account phase but I'm not sure that with the version of
openssh in RHEL4 it would help.

I don't think this problem is serious enough to need fixing in RHEL4 openssh.
Customers can easily fix this problem by removing pam_nologin from
/etc/pam.d/sshd themselves.

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