Bug 1018763 - SELinux is preventing /usr/bin/passwd from using the 'sys_admin' capabilities.
Summary: SELinux is preventing /usr/bin/passwd from using the 'sys_admin' capabilities.
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.0
Hardware: x86_64
OS: Unspecified
unspecified
unspecified
Target Milestone: beta
: 7.0
Assignee: Miroslav Grepl
QA Contact: BaseOS QE Security Team
URL:
Whiteboard: abrt_hash:8ebef673e8d999307f159040ae1...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-10-14 11:42 UTC by Martin
Modified: 2014-09-15 00:04 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-01-03 16:46:03 UTC
Target Upstream Version:


Attachments (Terms of Use)

Description Martin 2013-10-14 11:42:30 UTC
Description of problem:
Description of problem:
Testing  Multiple Graphical Login

1.    Install RHEL desktop on multiple virtual or bare metal machines.
2.    Edit the /etc/dconf/profile/user file on every client. If one does not already exist, create it.
3.    Add a line containing service-db:keyfile/user to the file and save your changes.
4.    Setup shared /home directory via NFS on each machine. Put the following line into /etc/fstab
    nest.test.redhat.com:/mnt/qa/scratch/rhel7-gnome-shell-shared-home  /home  nfs  rw  0 0
5.    Create account with username "test" and password "redhat".
6.    Login to Gnome.
SELinux is preventing /usr/bin/passwd from using the 'sys_admin' capabilities.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that passwd should have the sys_admin capability by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep passwd /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023
Target Context                unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023
Target Objects                 [ capability ]
Source                        passwd
Source Path                   /usr/bin/passwd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           passwd-0.79-1.el7.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.12.1-86.el7.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 3.10.0-33.el7.x86_64 #1 SMP Fri
                              Oct 4 11:13:14 EDT 2013 x86_64 x86_64
Alert Count                   1
First Seen                    2013-10-10 14:57:03 BST
Last Seen                     2013-10-10 14:57:03 BST
Local ID                      782db1b1-f3be-49dc-b25f-9c84af8a36e0

Raw Audit Messages
type=AVC msg=audit(1381413423.732:530): avc:  denied  { sys_admin } for  pid=2513 comm="passwd" capability=21  scontext=unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023 tclass=capability


type=SYSCALL msg=audit(1381413423.732:530): arch=x86_64 syscall=write success=yes exit=EPERM a0=2 a1=7fe9cadc3243 a2=1 a3=0 items=0 ppid=1849 pid=2513 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=tty2 ses=2 comm=passwd exe=/usr/bin/passwd subj=unconfined_u:unconfined_r:passwd_t:s0-s0:c0.c1023 key=(null)

Hash: passwd,passwd_t,passwd_t,capability,sys_admin

Additional info:
reporter:       libreport-2.1.7
hashmarkername: setroubleshoot
kernel:         3.10.0-33.el7.x86_64
type:           libreport

Comment 2 Miroslav Grepl 2013-10-16 08:40:53 UTC
Martin,
if you allow booleans from previous bugs, are you able reproduce this sys_admin capability AVC?

Comment 3 Martin 2013-12-16 13:49:18 UTC
(In reply to Miroslav Grepl from comment #2)
> Martin,
> if you allow booleans from previous bugs, are you able reproduce this
> sys_admin capability AVC?

No I haven't reproduced this problem since setting: "setsebool -P use_nfs_home_dirs 1".

Comment 4 Michal Trunecka 2014-01-03 10:08:16 UTC
So, is this a notabug?

Comment 5 Martin 2014-01-03 16:46:03 UTC
It's not a bug, it's a feature!


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