Bug 549937 - SELinux prevented yum from reading files stored on a NFS filesytem.
Summary: SELinux prevented yum from reading files stored on a NFS filesytem.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 12
Hardware: i386
OS: Linux
low
medium
Target Milestone: ---
Assignee: Daniel Walsh
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: setroubleshoot_trace_hash:f4be121a4a4...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2009-12-23 00:44 UTC by Bill Davidsen
Modified: 2010-01-08 20:10 UTC (History)
2 users (show)

Fixed In Version: 3.6.32-66.fc12
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2010-01-08 20:10:41 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Bill Davidsen 2009-12-23 00:44:46 UTC
Summary:

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

Detailed Description:

[yum has a permissive type (abrt_t). This access was not denied.]

SELinux prevented yum from reading files stored on a NFS filesystem. NFS
(Network Filesystem) is a network filesystem commonly used on Unix / Linux
systems. yum 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 yum 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:abrt_t:s0-s0:c0.c1023
Target Context                system_u:object_r:nfs_t:s0
Target Objects                repomd.xml [ file ]
Source                        yum
Source Path                   /usr/bin/python
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           python-2.6.2-2.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-56.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   use_nfs_home_dirs
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31.5-127.fc12.i686.PAE #1
                              SMP Sat Nov 7 21:25:57 EST 2009 i686 i686
Alert Count                   1
First Seen                    Tue 22 Dec 2009 07:42:34 PM EST
Last Seen                     Tue 22 Dec 2009 07:42:34 PM EST
Local ID                      bb2f80b6-fc53-49b0-9233-a4eaf31920cf
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1261528954.849:110): avc:  denied  { open } for  pid=12931 comm="yum" name="repomd.xml" dev=0:16 ino=4288060 scontext=unconfined_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:nfs_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1261528954.849:110): arch=40000003 syscall=5 success=yes exit=10 a0=a1beeb8 a1=8000 a2=1b6 a3=a1cc479 items=0 ppid=12930 pid=12931 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1 comm="yum" exe="/usr/bin/python" subj=unconfined_u:system_r:abrt_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  selinux-policy-3.6.32-56.fc12,use_nfs_home_dirs,yum,abrt_t,nfs_t,file,open
audit2allow suggests:

#============= abrt_t ==============
allow abrt_t nfs_t:file open;

Comment 1 Daniel Walsh 2009-12-23 12:13:58 UTC
You can add these rules for now using

# grep avc /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Fixed in selinux-policy-3.6.32-64.fc12.noarch

Comment 2 Fedora Update System 2010-01-04 21:54:13 UTC
selinux-policy-3.6.32-66.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/selinux-policy-3.6.32-66.fc12

Comment 3 Fedora Update System 2010-01-05 22:50:16 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update selinux-policy'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2010-0184

Comment 4 Fedora Update System 2010-01-08 20:05:04 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.


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