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Bug 1077809 - useradd not assigning correct SELinux user to contexts of home directory files
Summary: useradd not assigning correct SELinux user to contexts of home directory files
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: shadow-utils
Version: 7.0
Hardware: All
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Tomas Mraz
QA Contact: Stanislav Zidek
URL:
Whiteboard:
: 1134450 (view as bug list)
Depends On:
Blocks: 1110706
TreeView+ depends on / blocked
 
Reported: 2014-03-18 15:40 UTC by Tomas Mraz
Modified: 2014-09-15 11:13 UTC (History)
3 users (show)

Fixed In Version: shadow-utils-4.1.5.1-15.el7
Doc Type: Bug Fix
Doc Text:
Cause: The useradd assigned the SELinux user to the new user being created after creating and populating the home directory of the user. Consequence: The SELinux contexts of the home directory files were incorrect. Fix: The SELinux user is assigned to the newly created user before populating the home directory. Result: The SELinux contexts on the home directory files for newly created users are now correct.
Clone Of: 955769
Environment:
Last Closed: 2014-09-15 11:13:48 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2014:1191 0 normal SHIPPED_LIVE shadow-utils bug fix update 2014-09-15 15:13:42 UTC

Description Tomas Mraz 2014-03-18 15:40:03 UTC 
This bug applies to RHEL-7 as well.

+++ This bug was initially created as a clone of Bug #955769 +++

Description of problem:
Users created using useradd -Z are not given the correct user in the context of their home directory

Version-Release number of selected component (if applicable):
shadow-utils-4.1.4.2-13.el6.x86_64
possibly,
policycoreutils-python-2.0.8-19.30.el6_64

How reproducible:
Easily

Steps to Reproduce:
1.Switch to root
2.useradd -m testuser -Z staff_u
3.ls -Z /home/testuser 
  
Actual results:
drwx------. testuser testuser unconfined_u:object_r:user_home_dir_t:s0 .
drwxr-xr-x. root     root     system_u:object_r:home_root_t:s0 ..
-rw-r--r--. testuser testuser unconfined_u:object_r:user_home_t:s0 .bash_logout
-rw-r--r--. testuser testuser unconfined_u:object_r:user_home_t:s0 .bash_profile
-rw-r--r--. testuser testuser unconfined_u:object_r:user_home_t:s0 .bashrc
-rw-r--r--. testuser testuser unconfined_u:object_r:user_home_t:s0 .emacs
drwxr-xr-x. testuser testuser unconfined_u:object_r:gnome_home_t:s0 .gnome2
drwxr-xr-x. testuser testuser unconfined_u:object_r:mozilla_home_t:s0 .mozilla

Expected results:
ls -Za /home/testuser
drwx------. testuser testuser staff_u:object_r:user_home_dir_t:s0 .
drwxr-xr-x. root     root     system_u:object_r:home_root_t:s0 ..
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0 .bash_logout
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0 .bash_profile
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0 .bashrc
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0 .emacs
drwxr-xr-x. testuser testuser staff_u:object_r:gnome_home_t:s0 .gnome2
drwxr-xr-x. testuser testuser staff_u:object_r:mozilla_home_t:s0 .mozilla

Additional info:
If you run restorecon, the context is updated correctly
[root@owf SPECS]# restorecon -RF /home/testuser
[root@owf SPECS]# ls -Za /home/testuser
drwx------. testuser testuser staff_u:object_r:user_home_dir_t:s0 .
drwxr-xr-x. root     root     system_u:object_r:home_root_t:s0 ..
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0  .bash_logout
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0  .bash_profile
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0  .bashrc
-rw-r--r--. testuser testuser staff_u:object_r:user_home_t:s0  .emacs
drwxr-xr-x. testuser testuser staff_u:object_r:gnome_home_t:s0 .gnome2
drwxr-xr-x. testuser testuser staff_u:object_r:mozilla_home_t:s0 .mozilla

I've tested this on F18 and it's there as well. Looking at the code in useradd.c what is happening is that all of the files in a users home directories are written out before the SELinux user mappings are updated. So the system is using the default mapping of unconfined_u to write it out. There seem to be 2 quick fixes
1) Run restorecon -RF following the calls to semanage in useradd.c
2) Update semanage to have a flag to check if files need to be relabeled after adding a login mapping and update them.
Comment 1 Tomas Mraz 2014-08-27 14:18:16 UTC 
*** Bug 1134450 has been marked as a duplicate of this bug. ***
Comment 5 Tomas Mraz 2014-09-09 14:20:27 UTC 
Mirek, do you have any idea what could be wrong here? semanage_commit() is called and only then the home dir is created and files copied. If the semanage login entry is present before running useradd, the contexts are correct.

On RHEL-6 where the code is the same except semanage command is used instead of libsemanage calls, it works correctly.
Comment 6 Tomas Mraz 2014-09-10 08:39:37 UTC 
It seems that adding matchpathcon_fini() after semanage_commit() fixes this.
Comment 10 errata-xmlrpc 2014-09-15 11:13:48 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1191.html
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