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Bug 1448090

Summary: [GANESHA] AVC denials for unreserved port observed while changing RQUOTA port in ganesha.conf file
Product: Red Hat Enterprise Linux 7 Reporter: Manisha Saini <msaini>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: unspecified Docs Contact:
Priority: urgent    
Version: 7.3CC: amukherj, asrivast, fkrska, jthottan, lvrabec, mgrepl, mmalik, msaini, pdhange, plautrba, pvrabec, rhs-bugs, rnalakka, skoduri, ssekidde, storage-qa-internal
Target Milestone: pre-dev-freezeKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1450038 1455236 (view as bug list) Environment:
Last Closed: 2017-08-01 15:26:23 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: 1450038, 1455236    

Description Manisha Saini 2017-05-04 13:52:56 UTC 
Description of problem:

Due to some gluster process using  Rquota_Port 875,ganesha service failed to come up after reboot.So if the Rquota_Port is changed in ganesha.conf file,AVC's denials were observed in audit.log 

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

# rpm -qa | grep selinux
selinux-policy-targeted-3.13.1-102.el7.noarch
libselinux-utils-2.5-6.el7.x86_64
libselinux-2.5-6.el7.x86_64
libselinux-python-2.5-6.el7.x86_64
selinux-policy-3.13.1-102.el7.noarch

glusterfs-ganesha-3.8.4-24.el7rhgs.x86_64

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.3 (Maipo)

How reproducible:


Steps to Reproduce:
1.Create 8 node ganesha cluster.
2.Create volume.Enable ganesha on it.
3.Mount the volume to client and run IO's.
4.Reboot one of the node

Actual results:
On rebooted node ganesha service failed to come up due to Rquota bind issue (as the 875 port which is there for RQUOTA is being used by some other gluster process).
After changing the RQUOTA_port to 8750 in ganesha.conf,AVC denials were observed in audit.log


Expected results:
No AVC denials should be seen.

Additional info:

# tailf /var/log/ganesha.log 
04/05/2017 18:58:50 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] init_server_pkgs :NFS STARTUP :EVENT :ID Mapper successfully initialized.
04/05/2017 18:58:50 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] glusterfs_create_export :FSAL :EVENT :Volume ganesha1 exported at : '/'
04/05/2017 18:58:57 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] glusterfs_create_export :FSAL :EVENT :Volume ganesha2 exported at : '/'
04/05/2017 18:59:03 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] glusterfs_create_export :FSAL :EVENT :Volume ganesha3 exported at : '/'
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] lower_my_caps :NFS STARTUP :EVENT :CAP_SYS_RESOURCE was successfully removed for proper quota management in FSAL
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] lower_my_caps :NFS STARTUP :EVENT :currenty set capabilities are: = cap_chown,cap_dac_override,cap_dac_read_search,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_linux_immutable,cap_net_bind_service,cap_net_broadcast,cap_net_admin,cap_net_raw,cap_ipc_lock,cap_ipc_owner,cap_sys_module,cap_sys_rawio,cap_sys_chroot,cap_sys_ptrace,cap_sys_pacct,cap_sys_admin,cap_sys_boot,cap_sys_nice,cap_sys_time,cap_sys_tty_config,cap_mknod,cap_lease,cap_audit_write,cap_audit_control,cap_setfcap+ep
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] Bind_sockets_V6 :DISP :WARN :Cannot bind RQUOTA tcp6 socket, error 98 (Address already in use)
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] Bind_sockets :DISP :FATAL :Error binding to V6 interface. Cannot continue.
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] unregister_fsal :FSAL :CRIT :Unregister FSAL GLUSTER with non-zero refcount=3
04/05/2017 18:59:09 : epoch 40f00000 : dhcp42-127.lab.eng.blr.redhat.com : ganesha.nfsd-17333[main] glusterfs_unload :FSAL :CRIT :FSAL Gluster unable to unload.  Dying ...


#/var/log/audit/audit.log

type=AVC msg=audit(1493900430.337:1467): avc:  denied  { name_bind } for  pid=28137 comm="ganesha.nfsd" src=8751 scontext=system_u:system_r:glusterd_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=udp_socket

type=AVC msg=audit(1493900510.810:1481): avc:  denied  { name_bind } for  pid=28253 comm="ganesha.nfsd" src=8751 scontext=system_u:system_r:glusterd_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=udp_socket




According to comment #1 of https://bugzilla.redhat.com/show_bug.cgi?id=1357508,
this issue seems to be fixed in Rhel 7.3
Comment 2 Manisha Saini 2017-05-05 11:43:37 UTC 
On setting setsebool -P nis_enabled on ,No AVC's related to unreserved port were observed.
And on restarting nfs-ganesha service, the ganesha process came up on node.
Comment 12 Milos Malik 2017-05-17 09:31:15 UTC 
I assumed that ganesha.conf file uses a non-default value of Rquota_Port.

Following SELinux denial appears in permissive mode:
----
type=PROCTITLE msg=audit(05/17/2017 11:27:07.835:826) : proctitle=bash -c nc -u -6 -l ::1 8750 
type=SOCKADDR msg=audit(05/17/2017 11:27:07.835:826) : saddr={ fam=inet6 laddr=::1 lport=8750 } 
type=SYSCALL msg=audit(05/17/2017 11:27:07.835:826) : arch=x86_64 syscall=bind success=yes exit=0 a0=0x3 a1=0x658c60 a2=0x80 a3=0x7ffdad5b9440 items=0 ppid=1707 pid=5447 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=1 comm=nc exe=/usr/bin/ncat subj=system_u:system_r:ganesha_t:s0 key=(null) 
type=AVC msg=audit(05/17/2017 11:27:07.835:826) : avc:  denied  { name_bind } for  pid=5447 comm=nc src=8750 scontext=system_u:system_r:ganesha_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=udp_socket permissive=1 
----

Using a fake reproducer:
# runcon system_u:system_r:ganesha_t:s0 bash -c 'nc -u -6 -l ::1 8750'
Comment 51 errata-xmlrpc 2017-08-01 15:26:23 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://access.redhat.com/errata/RHBA-2017:1861