Description of problem:

Summary:

SELinux prevented groupadd from reading files stored on a NFS filesytem.

Detailed Description:

SELinux prevented groupadd from reading files stored on a NFS filesystem. NFS
(Network Filesystem) is a network filesystem commonly used on Unix / Linux
systems. groupadd attempted to read one or more files or directories from a
mounted filesystem of this type. As NFS filesystems do not support fine-grained
SELinux labeling, all files and directories in the filesystem will have the same
security context. If you have not configured groupadd to read files from a NFS
filesystem this access attempt could signal an intrusion attempt.

Allowing Access:

Changing the "use_nfs_home_dirs" boolean to true will allow this access:
"setsebool -P use_nfs_home_dirs=1"

Fix Command:

setsebool -P use_nfs_home_dirs=1

Additional Information:

Source Context                unconfined_u:system_r:groupadd_t:s0-s0:c0.c1023
Target Context                system_u:object_r:nfs_t:s0
Target Objects                ./ [ dir ]
Source                        groupadd
Source Path                   /usr/sbin/groupadd
Port                          <Unknown>
Host                          segfault.boston.devel.redhat.com
Source RPM Packages           shadow-utils-4.1.1-2.fc9
Target RPM Packages           filesystem-2.4.13-1.fc9
Policy RPM                    selinux-policy-3.3.1-64.fc9
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   use_nfs_home_dirs
Host Name                     segfault.boston.devel.redhat.com
Platform                      Linux segfault.boston.devel.redhat.com
                              2.6.25.6-55.fc9.x86_64 #1 SMP Tue Jun 10 16:05:21
                              EDT 2008 x86_64 x86_64
Alert Count                   2
First Seen                    Wed 25 Jun 2008 12:12:40 PM EDT
Last Seen                     Wed 25 Jun 2008 12:12:40 PM EDT
Local ID                      85ac57ac-7a6b-4cf6-b13d-8a598be77f0c
Line Numbers                  

Raw Audit Messages            

host=segfault.boston.devel.redhat.com type=AVC msg=audit(1214410360.511:381):
avc:  denied  { search } for  pid=21579 comm="groupadd" name="" dev=0:18
ino=15375843 scontext=unconfined_u:system_r:groupadd_t:s0-s0:c0.c1023
tcontext=system_u:object_r:nfs_t:s0 tclass=dir

host=segfault.boston.devel.redhat.com type=SYSCALL
msg=audit(1214410360.511:381): arch=c000003e syscall=2 success=no exit=-13
a0=956730 a1=0 a2=1b6 a3=7ff9e556a780 items=0 ppid=21578 pid=21579 auid=3734
uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=9
comm="groupadd" exe="/usr/sbin/groupadd"
subj=unconfined_u:system_r:groupadd_t:s0-s0:c0.c1023 key=(null)


How reproducible:


Steps to Reproduce:
1. yum install mock while having an NFS-mounted directory (in my case, my homedir).