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Bug 1250550 - Allow snapperd one-way communication with clients via pipe
Summary: Allow snapperd one-way communication with clients via pipe
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.2
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-08-05 12:47 UTC by Ondrej Kozina
Modified: 2015-11-19 10:43 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-3.13.1-39.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-19 10:43:06 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:2300 0 normal SHIPPED_LIVE selinux-policy bug fix update 2015-11-19 09:55:26 UTC

Description Ondrej Kozina 2015-08-05 12:47:29 UTC 
Could you please allow snapperd to pass data (one way only) via pipe negotiated over dbus?

type=AVC msg=audit(1438778241.065:237): avc:  denied  { read } for  pid=1550 comm="dbus-daemon" path="pipe:[63866]" dev="pipefs" ino=63866 scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=fifo_file

We do not open new hole since snapper is already effectively bypassing MAC by passing list of files over dbus already. Now we just send the list via pipe because of dbus message size limitations


Version-Release number of selected component (if applicable):
snapper-0.1.7-10.el7
selinux-policy-3.13.1-36.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. create two snapshot with snapper (so that diff is non-empty)
2. run snapper -c some_name status 1..2 (1 and 2 are snapshots created in step 1.)


Actual results:
[root@ibm-p8-02-lp3 xfs]# snapper -c xfs status 1..2
Failure (org.freedesktop.DBus.Error.NoReply).
Comment 2 Milos Malik 2015-08-05 13:04:06 UTC 
Does the scenario trigger any other AVCs in permissive mode?
Comment 3 Ondrej Kozina 2015-08-06 08:14:22 UTC 
This is full listing. AFAICT only the read denial is blocking snapperd from sending data back to clients.

type=AVC msg=audit(1438848621.979:313): avc:  denied  { noatsecure } for  pid=30847 comm="snapperd" scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=process

type=AVC msg=audit(1438848621.979:313): avc:  denied  { siginh } for  pid=30847 comm="snapperd" scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=process

type=AVC msg=audit(1438848621.979:313): avc:  denied  { rlimitinh } for  pid=30847 comm="snapperd" scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=process

type=AVC msg=audit(1438848622.149:314): avc:  denied  { read } for  pid=1393 comm="dbus-daemon" path="pipe:[58763]" dev="pipefs" ino=58763 scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=fifo_file
Comment 6 Miroslav Grepl 2015-08-06 14:34:19 UTC 
We want to allow

type=AVC msg=audit(1438848622.149:314): avc:  denied  { read } for  pid=1393 comm="dbus-daemon" path="pipe:[58763]" dev="pipefs" ino=58763 scontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=fifo_file
Comment 10 errata-xmlrpc 2015-11-19 10:43:06 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-2015-2300.html
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