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Bug 861900 - SELinux prevents /usr/sbin/fence_virtd (virsh_t) from create access on the file /var/run/fence_virtd.pid (var_run_t)
Summary: SELinux prevents /usr/sbin/fence_virtd (virsh_t) from create access on the fi...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-10-01 09:45 UTC by Milos Malik
Modified: 2014-06-18 02:15 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-13 10:31:14 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
AVCs caught in enforcing and permissive mode (46.92 KB, text/plain)
2012-11-05 14:46 UTC, Milos Malik 		no flags Details
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System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 675323 0 None None None Never

Description Milos Malik 2012-10-01 09:45:53 UTC 
Description of problem:


Version-Release number of selected component (if applicable):
fence-virt-0.3.0-6.el7.x86_64
fence-virtd-0.3.0-6.el7.x86_64
fence-virtd-libvirt-0.3.0-6.el7.x86_64
fence-virtd-multicast-0.3.0-6.el7.x86_64
fence-virtd-serial-0.3.0-6.el7.x86_64
selinux-policy-3.11.1-26.el7.noarch
selinux-policy-devel-3.11.1-26.el7.noarch
selinux-policy-doc-3.11.1-26.el7.noarch
selinux-policy-minimum-3.11.1-26.el7.noarch
selinux-policy-targeted-3.11.1-26.el7.noarch

How reproducible:
always

Steps to Reproduce:
# fence_virtd -c
# dd if=/dev/urandom bs=512 count=1 of=/etc/cluster/fence_xvm.key
# service fence_virtd start
Redirecting to /bin/systemctl start  fence_virtd.service
# service fence_virtd status
Redirecting to /bin/systemctl status  fence_virtd.service
fence_virtd.service - Fence-Virt system host daemon
	  Loaded: loaded (/usr/lib/systemd/system/fence_virtd.service; disabled)
	  Active: inactive (dead) since Mon, 01 Oct 2012 11:41:46 +0000; 3s ago
	 Process: 9882 ExecStart=/usr/sbin/fence_virtd $FENCE_VIRTD_ARGS (code=exited, status=0/SUCCESS)
	Main PID: 9361 (code=killed, signal=KILL)
	  CGroup: name=systemd:/system/fence_virtd.service
# 

  
Actual results in enforcing mode:
----
type=PATH msg=audit(10/01/2012 11:41:46.977:739) : item=0 name=/var/run/fence_virtd.pid inode=1188 dev=00:11 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_run_t:s0 
type=CWD msg=audit(10/01/2012 11:41:46.977:739) :  cwd=/ 
type=SYSCALL msg=audit(10/01/2012 11:41:46.977:739) : arch=x86_64 syscall=open success=no exit=-13(Permission denied) a0=0x60b280 a1=O_WRONLY|O_CREAT|O_TRUNC a2=0x1b6 a3=0x238 items=1 ppid=9882 pid=9883 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:41:46.977:739) : avc:  denied  { create } for  pid=9883 comm=fence_virtd name=fence_virtd.pid scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file 
----

Expected results:
 * no AVCs
Comment 1 Milos Malik 2012-10-01 09:52:06 UTC 
"service fence_virtd start" command causes following AVCs in permissive mode:
----
type=SYSCALL msg=audit(10/01/2012 11:47:03.622:751) : arch=x86_64 syscall=fstat success=yes exit=0 a0=0x3 a1=0x7ffffef39050 a2=0x7ffffef39050 a3=0x408291 items=0 ppid=1 pid=9986 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:47:03.622:751) : avc:  denied  { getattr } for  pid=9986 comm=fence_virtd path=/run/fence_virtd.pid dev="tmpfs" ino=42146 scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file 
----
type=PATH msg=audit(10/01/2012 11:47:03.621:750) : item=1 name=/var/run/fence_virtd.pid inode=42146 dev=00:11 mode=file,644 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_run_t:s0 
type=PATH msg=audit(10/01/2012 11:47:03.621:750) : item=0 name=/var/run/ inode=1188 dev=00:11 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:var_run_t:s0 
type=CWD msg=audit(10/01/2012 11:47:03.621:750) :  cwd=/ 
type=SYSCALL msg=audit(10/01/2012 11:47:03.621:750) : arch=x86_64 syscall=open success=yes exit=3 a0=0x60b280 a1=O_WRONLY|O_CREAT|O_TRUNC a2=0x1b6 a3=0x238 items=2 ppid=9985 pid=9986 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:47:03.621:750) : avc:  denied  { write open } for  pid=9986 comm=fence_virtd path=/run/fence_virtd.pid dev="tmpfs" ino=42146 scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file 
type=AVC msg=audit(10/01/2012 11:47:03.621:750) : avc:  denied  { create } for  pid=9986 comm=fence_virtd name=fence_virtd.pid scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file 
----
type=PATH msg=audit(10/01/2012 11:47:03.639:753) : item=0 name=/etc/cluster/fence_xvm.key inode=393905 dev=08:04 mode=file,644 ouid=root ogid=root rdev=00:00 obj=unconfined_u:object_r:cluster_conf_t:s0 
type=CWD msg=audit(10/01/2012 11:47:03.639:753) :  cwd=/ 
type=SYSCALL msg=audit(10/01/2012 11:47:03.639:753) : arch=x86_64 syscall=open success=yes exit=8 a0=0x1fcbb20 a1=O_RDONLY a2=0x1000 a3=0x6 items=1 ppid=1 pid=9986 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:47:03.639:753) : avc:  denied  { open } for  pid=9986 comm=fence_virtd path=/etc/cluster/fence_xvm.key dev="sda4" ino=393905 scontext=system_u:system_r:virsh_t:s0 tcontext=unconfined_u:object_r:cluster_conf_t:s0 tclass=file 
type=AVC msg=audit(10/01/2012 11:47:03.639:753) : avc:  denied  { read } for  pid=9986 comm=fence_virtd name=fence_xvm.key dev="sda4" ino=393905 scontext=system_u:system_r:virsh_t:s0 tcontext=unconfined_u:object_r:cluster_conf_t:s0 tclass=file 
----
type=SOCKADDR msg=audit(10/01/2012 11:47:03.639:754) : saddr=inet host:0.0.0.0 serv:1229 
type=SYSCALL msg=audit(10/01/2012 11:47:03.639:754) : arch=x86_64 syscall=bind success=yes exit=0 a0=0x8 a1=0x7ffffef398c0 a2=0x10 a3=0x1 items=0 ppid=1 pid=9986 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:47:03.639:754) : avc:  denied  { node_bind } for  pid=9986 comm=fence_virtd src=1229 scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:node_t:s0 tclass=udp_socket 
type=AVC msg=audit(10/01/2012 11:47:03.639:754) : avc:  denied  { name_bind } for  pid=9986 comm=fence_virtd src=1229 scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:zented_port_t:s0 tclass=udp_socket 
----

"fence_xvm -o list" command causes following AVC in permissive mode:
----
type=SOCKADDR msg=audit(10/01/2012 11:48:09.299:755) : saddr=inet host:127.0.0.1 serv:1229 
type=SYSCALL msg=audit(10/01/2012 11:48:09.299:755) : arch=x86_64 syscall=connect success=no exit=-115(Operation now in progress) a0=0x9 a1=0x7ffffef39260 a2=0x10 a3=0x7ffffef39104 items=0 ppid=1 pid=9986 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=fence_virtd exe=/usr/sbin/fence_virtd subj=system_u:system_r:virsh_t:s0 key=(null) 
type=AVC msg=audit(10/01/2012 11:48:09.299:755) : avc:  denied  { name_connect } for  pid=9986 comm=fence_virtd dest=1229 scontext=system_u:system_r:virsh_t:s0 tcontext=system_u:object_r:zented_port_t:s0 tclass=tcp_socket 
----
Comment 2 Daniel Walsh 2012-10-01 10:15:14 UTC 
Fixed in selinux-policy-3.11.1-29.el7
Comment 4 Daniel Walsh 2012-10-30 18:17:52 UTC 
In the previous bug fence_virtd was running as virsh_t, now it is running as fenced_t?  Are we debugging two different things here.  In the fist case was it being run from init, and not it is being launched by fenced?
Comment 5 Milos Malik 2012-10-31 07:57:06 UTC 
I don't know why was the file labelled differently when I reported the bug. I can think of 2 possibilities:
 * default label of that file changed in selinux-policy
 * I changed the file label manually for testing purposes and didn't run restorecon then

# rpm -qa selinux-policy\*
selinux-policy-mls-3.11.1-44.el7.noarch
selinux-policy-doc-3.11.1-44.el7.noarch
selinux-policy-3.11.1-44.el7.noarch
selinux-policy-targeted-3.11.1-44.el7.noarch
selinux-policy-minimum-3.11.1-44.el7.noarch
selinux-policy-devel-3.11.1-44.el7.noarch
# sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28
# matchpathcon `which fence_virtd`
/usr/sbin/fence_virtd	system_u:object_r:fenced_exec_t:s0
#

However, the file is labelled fenced_exec_t according to latest selinux-policy. Please ignore comment#0 and comment#1.
Comment 6 Daniel Walsh 2012-10-31 11:02:03 UTC 
No Miroslav informed me policy changed.  My mistake.

Fixed in selinux-policy-3.11.1-49.el7
Comment 7 Milos Malik 2012-11-05 14:43:07 UTC 
# rpm -qa selinux-policy\*
selinux-policy-devel-3.11.1-49.el7.noarch
selinux-policy-doc-3.11.1-49.el7.noarch
selinux-policy-mls-3.11.1-49.el7.noarch
selinux-policy-minimum-3.11.1-49.el7.noarch
selinux-policy-targeted-3.11.1-49.el7.noarch
selinux-policy-3.11.1-49.el7.noarch
# sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   permissive
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28
# service fence_virtd start
Redirecting to /bin/systemctl start  fence_virtd.service
# ausearch -m avc -ts recent -i | audit2allow

#============= fenced_t ==============
allow fenced_t virt_etc_t:dir search;
allow fenced_t virt_etc_t:file { read open };
allow fenced_t virt_var_run_t:dir search;
allow fenced_t virt_var_run_t:sock_file write;
allow fenced_t virtd_exec_t:file getattr;
allow fenced_t virtd_t:unix_stream_socket connectto;
#
Comment 8 Milos Malik 2012-11-05 14:46:44 UTC 
Created attachment 638674 [details]
AVCs caught in enforcing and permissive mode
Comment 10 Daniel Walsh 2012-11-12 16:38:39 UTC 
I am thinking we need

optional_policy(`
	virt_domtrans(fenced_t)
	virt_read_config(fenced_t)
	virt_read_pid_files(fenced_t)
	virt_stream_connect(fenced_t)
')

Milos does fencd_virtd restart libvirt?
Comment 11 Daniel Walsh 2012-11-12 16:39:33 UTC 
Fixed in selinux-policy-3.11.1-53.el7
Comment 17 Miroslav Grepl 2014-01-20 10:19:15 UTC 
#!!!! This avc is allowed in the current policy
allow fenced_t zented_port_t:udp_socket name_bind;

is going to be fixed with the next builds.
Comment 18 Ludek Smid 2014-06-13 10:31:14 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

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