RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1174249 - AVC denied for OpenVPN for block_suspend for tclass=capability2
Summary: AVC denied for OpenVPN for block_suspend for tclass=capability2
Keywords:
Status: CLOSED ERRATA
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: Simon Sekidde
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-12-15 13:47 UTC by Robert Scheck
Modified: 2019-04-16 14:28 UTC (History)
9 users (show)

Fixed In Version: selinux-policy-3.13.1-15.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 10:47:51 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0458 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2015-03-05 15:17:00 UTC

Description Robert Scheck 2014-12-15 13:47:24 UTC 
Description of problem:
type=AVC msg=audit(1418385621.665:8029): avc:  denied  { block_suspend } for  pid=16389 comm="openvpn" capability=36  scontext=system_u:system_r:openvpn_t:s0 tcontext=system_u:system_r:openvpn_t:s0 tclass=capability2
type=SYSCALL msg=audit(1418385621.665:8029): arch=x86_64 syscall=epoll_ctl success=yes exit=0 a0=7 a1=2 a2=8 a3=7fff57392620 items=0 ppid=1 pid=16389 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=openvpn exe=/usr/sbin/openvpn subj=system_u:system_r:openvpn_t:s0 key=(null)

Version-Release number of selected component (if applicable):
openvpn-2.3.6-1.el7.x86_64
selinux-policy-3.12.1-153.el7_0.12.noarch
selinux-policy-targeted-3.12.1-153.el7_0.12.noarch

How reproducible:
No idea when this happens explicitly, but once in a while somehow.

Actual results:
AVC denied for OpenVPN for block_suspend for tclass=capability2.

Expected results:
No AVC denied.
Comment 1 Robert Scheck 2014-12-15 13:48:47 UTC 
Cross-filed case #01319842 on the Red Hat Customer Portal.
Comment 3 Simon Sekidde 2014-12-17 19:05:44 UTC 
Robert, 

I'm not sure whats going on but this is allowed for scripts labeled openvpn_unconfined_script_t
Comment 4 Robert Scheck 2014-12-17 21:22:10 UTC 
No matter if it helps, but:

# ps auxZ | grep -i vpn
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 root 15363 0.0  0.0 112652 972 pts/2 R+ 22:16   0:00 grep --color=auto -i vpn
system_u:system_r:openvpn_t:s0  root     16124  0.0  0.0  51796  2636 ?        Ss   Dez11   1:06 /usr/sbin/openvpn --daemon --writepid /var/run/openvpn/road-server.pid --cd /etc/openvpn/ --config road-server.conf
system_u:system_r:openvpn_t:s0  root     16389  0.0  0.0  52372  2088 ?        Ss   Dez11   0:11 /usr/sbin/openvpn --daemon --writepid /var/run/openvpn/road-server-tcp.pid --cd /etc/openvpn/ --config road-server-tcp.conf
# 

We do not have "client-connect" or "client-disconnect" in the *.conf (which
is the only thing I know related to "openvpn_unconfined_script_t").

What is block_suspend for tclass=capability2 exactly? I am even unsure if it
deserves a dontaudit or an allow (we are running permissive here for other
reasons, so I don't know if a denial would have actually impact).
Comment 5 Robert Scheck 2014-12-17 21:36:22 UTC 
(In reply to Robert Scheck from comment #4)
> What is block_suspend for tclass=capability2 exactly? I am even unsure if it
> deserves a dontaudit or an allow (we are running permissive here for other
> reasons, so I don't know if a denial would have actually impact).

Ush, I read the RHBZ before the ticket, https://lwn.net/Articles/520198/ is
answering it indeed.

No matter if it helps, but the following OpenVPN events were logged one second
before or in the same second (related to the AVC denied):

Dec 12 14:26:41 tux openvpn[16389]: MULTI: new connection by client 'Tux' will cause previous active sessions by this client to be dropped.  Remember to use the --duplicate-cn option if you want multiple clients using the same certificate or username to concurrently connect.

Dec 12 16:22:47 tux openvpn[16389]: Tux/192.0.2.53:2363 Connection reset, restarting [-1]
Dec 12 16:22:47 tux openvpn[16389]: Tux/192.0.2.53:2363 SIGUSR1[soft,connection-reset] received, client-instance restarting

However these events are not really easy to reproduce IMHO, I would need a
buggy Internet connectivity ;-) Maybe that event is even not related.
Comment 7 Robert Scheck 2015-01-12 12:58:40 UTC 
May I ask what the fix is?
Comment 8 Milos Malik 2015-01-12 14:39:26 UTC 
dontaudit rule for that kind of access
Comment 9 Miroslav Grepl 2015-01-12 15:15:21 UTC 
Yes, this is a kernel bug and we added dontaudit rule until a kernel fix.
Comment 14 errata-xmlrpc 2015-03-05 10:47:51 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-2015-0458.html
Note You need to log in before you can comment on or make changes to this bug.