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Bug 1343929

Summary: [SELinux]: kerberos mount fails with selinux denials in audit logs.
Product: Red Hat Enterprise Linux 7 Reporter: Prasanth <pprakash>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: urgent Docs Contact: Marie Hornickova <mdolezel>
Priority: high    
Version: 7.2CC: lvrabec, mdolezel, mgrepl, mmalik, plautrba, pprakash, pvrabec, rcyriac, snagar, sraj, ssekidde
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-78.el7 Doc Type: If docs needed, set a value
Doc Text:
When the nfs-ganesha server was set up with a volume, and an attempt to mount this volume on a client within the Kerberos network was made, SELinux denied this Kerberos mount. This update ensures that the Gluster SELinux domain can read the Kerberos keytab files. As a result, the Kerberos mount is successful in the described scenario.
 Story Points: ---
Clone Of: 1343925
: 1344630 (view as bug list) Environment:
Last Closed: 2016-11-04 02:30:57 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1344630    

Description Prasanth 2016-06-08 10:47:06 UTC 
+++ This bug was initially created as a clone of Bug #1343925 +++

Description of problem:

kerberos mount fails with selinux denials in audit logs.

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

nfs-ganesha-2.3.1-7

How reproducible:

Always

Steps to Reproduce:
1. Create a ganesha and kerberos setup.
2. Create a volume, export it via ganesha.
3. Edit the Sectype parameter as krb5 and try mounting the volume on the client
4. Observe that the kerberos mount fails with below message:

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5 dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
mount.nfs: access denied by server while mounting dhcp42-142.lab.eng.blr.redhat.com:/testvolume

and following AVC's are seen in audit.log (in enforcing mode):

type=AVC msg=audit(1465381707.050:4787): avc:  denied  { read } for  pid=12550 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.050:4787): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=12550 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381707.053:4788): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.053:4788): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381707.055:4789): avc:  denied  { read } for  pid=12550 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.055:4789): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=12550 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381707.058:4790): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.058:4790): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381707.070:4791): avc:  denied  { read } for  pid=12550 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.070:4791): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=12550 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381707.073:4792): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465381707.073:4792): arch=c000003e syscall=2 success=no exit=-13 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465381708.252:4793): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file


In permissive mode the volume gets mounted without any issues but below AVC's are seen in audit.log

type=AVC msg=audit(1465382280.091:4826): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=AVC msg=audit(1465382280.091:4826): avc:  denied  { open } for  pid=4911 comm="ganesha.nfsd" path="/etc/krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465382280.091:4826): arch=c000003e syscall=2 success=yes exit=69 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465382280.091:4827): avc:  denied  { lock } for  pid=4911 comm="ganesha.nfsd" path="/etc/krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465382280.091:4827): arch=c000003e syscall=72 success=yes exit=0 a0=45 a1=7 a2=7fbe1d0f08c0 a3=1 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465382280.095:4828): avc:  denied  { setfscreate } for  pid=4911 comm="ganesha.nfsd" scontext=system_u:system_r:glusterd_t:s0 tcontext=system_u:system_r:glusterd_t:s0 tclass=process
type=SYSCALL msg=audit(1465382280.095:4828): arch=c000003e syscall=1 success=yes exit=40 a0=46 a1=7fbe0c2c7e40 a2=28 a3=636163725f74736f items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)

type=AVC msg=audit(1465382439.611:4837): avc:  denied  { read } for  pid=4911 comm="ganesha.nfsd" name="krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=AVC msg=audit(1465382439.611:4837): avc:  denied  { open } for  pid=4911 comm="ganesha.nfsd" path="/etc/krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465382439.611:4837): arch=c000003e syscall=2 success=yes exit=75 a0=7fbe0c183a80 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)
type=AVC msg=audit(1465382439.611:4838): avc:  denied  { lock } for  pid=4911 comm="ganesha.nfsd" path="/etc/krb5.keytab" dev="dm-0" ino=34326612 scontext=system_u:system_r:glusterd_t:s0 tcontext=unconfined_u:object_r:krb5_keytab_t:s0 tclass=file
type=SYSCALL msg=audit(1465382439.611:4838): arch=c000003e syscall=72 success=yes exit=0 a0=4b a1=7 a2=7fbe1d0f08c0 a3=1 items=0 ppid=1 pid=4911 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ganesha.nfsd" exe="/usr/bin/ganesha.nfsd" subj=system_u:system_r:glusterd_t:s0 key=(null)

Actual results:

kerberos mount fails with selinux denials in audit logs.

Expected results:

There should not be any AVC denial messages and kerberos mount should be successful.

Additional info:

--- Additional comment from Red Hat Bugzilla Rules Engine on 2016-06-08 06:42:23 EDT ---

This bug is automatically being proposed for the current z-stream release of Red Hat Gluster Storage 3 by setting the release flag 'rhgs‑3.1.z' to '?'. 

If this bug should be proposed for a different release, please manually change the proposed release flag.

--- Additional comment from Shashank Raj on 2016-06-08 06:43:28 EDT ---

Since this will not allow volumes to be mounted using kerberos. raising a blocker flag.
Comment 4 Shashank Raj 2016-06-09 06:27:46 UTC 
Without the workaround:

[root@dhcp42-142 ~]# rpm -qa|grep selinux
selinux-policy-targeted-3.13.1-60.el7_2.6.noarch
selinux-policy-3.13.1-60.el7_2.6.noarch

[root@dhcp42-142 ~]# getenforce
Enforcing

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5 dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
mount.nfs: access denied by server while mounting 
dhcp42-142.lab.eng.blr.redhat.com:/testvolume

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5i dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
mount.nfs: access denied by server while mounting dhcp42-142.lab.eng.blr.redhat.com:/testvolume

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5p dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
mount.nfs: access denied by server while mounting dhcp42-142.lab.eng.blr.redhat.com:/testvolume

With the workaround:

In enforcing mode:

mount is successful and no AVC's are seen

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5 dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5i dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5p dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt

In permissive mode:

Mount is successful and no AVC's are seen

[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5 dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5i dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt
[root@dhcp42-130 ~]# mount -t nfs -o sec=krb5p dhcp42-142.lab.eng.blr.redhat.com:/testvolume /mnt

So the above workaround mentioned in comment 2 works fine; kerberos mount is successful and no AVC's are seen in audit.log
Comment 5 Lukas Vrabec 2016-06-09 10:12:12 UTC 
Thank you for testing.
Comment 11 errata-xmlrpc 2016-11-04 02:30:57 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.

https://rhn.redhat.com/errata/RHBA-2016-2283.html