Bug 617449 - Document behaviour of SSSD, SELinux and pam_mkhomedir
Document behaviour of SSSD, SELinux and pam_mkhomedir
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: Documentation (Show other bugs)
All Linux
low Severity medium
: rc
: ---
Assigned To: David O'Brien
Chandrasekar Kannan
: Documentation
Depends On:
  Show dependency treegraph
Reported: 2010-07-23 00:41 EDT by David O'Brien
Modified: 2015-01-04 18:43 EST (History)
6 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-11-11 10:23:44 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

  None (edit)
Description David O'Brien 2010-07-23 00:41:07 EDT
Description of problem:

From sgallagh email to ipa-samba email list:

This is something that probably belongs in the SSSD documentation.

If your users in LDAP have home directories that are not in /home (e.g. my homedir at Red Hat is /home/bos/sgallagh) then if the system is configured for making home directories on first login, they will be created with the wrong permissions.

The following steps need to be taken (preemptively):
semanage fcontext -a -e /home /path/to/homedirs
and home directory creation should be performed with pam_oddjob_mkhomedir.so NOT pam_mkhomedir.so (the latter cannot create SELinux labels).  Authconfig will use pam_oddjob_mkhomedir.so if it is available when authconfig is run, otherwise it will default to pam_mkhomedir.so

If those steps didn't happen, the homedir can be brought into compliance by running the above semanage fcontext command and then running:
restorecon -R -v /path/to/homedirs

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Actual results:

Expected results:

Additional info:
Comment 3 David O'Brien 2010-07-27 06:33:42 EDT
I've added all the info from here into a sub-section of Configuring PAM in the RHEL 6 Deployment Guide:

" Using Custom Home Directories with SSSD".

I'm hoping to get a bit more info on how to specify which PAM library to use, and also how to edit the PAM config file without it being overwritten by authconfig.

8e161a2..6fbbe42  master -> master
Comment 4 Stephen Gallagher 2010-07-27 07:16:50 EDT
Authconfig in RHEL6 will automatically prefer pam_oddjob_mkhomedir.so if its package is installed on the system. So to select this library, simply install the 'oddjob-mkhomedir' package and then re-run authconfig.

To answer your question about overwriting the PAM config directly (even though it's unrelated to the specific problem): Authconfig does not edit /etc/pam.d/system-auth and /etc/pam.d/password-auth directly. It instead edits /etc/pam.d/system-auth-ac and /etc/pam.d/password-auth-ac. By default on Fedora, /etc/pam.d/system-auth is a symlink to /etc/pam.d/system-auth-ac (ditto for password-auth-ac), so in order to prevent authconfig from overwriting PAM changes, all that needs to be done is to break the symlink (e.g. 'rm -f system-auth; cp system-auth-ac system-auth; <make manual changes to system-auth>')
Comment 5 David O'Brien 2010-07-27 23:28:40 EDT
c7c12af..206c302  master -> master
Comment 7 releng-rhel@redhat.com 2010-11-11 10:23:44 EST
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.

Note You need to log in before you can comment on or make changes to this bug.