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Bug 1618757 - chronyc cannot write to pipe (socket when executed from ksh)
Summary: chronyc cannot write to pipe (socket when executed from ksh)
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.5
Hardware: Unspecified
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1622499
TreeView+ depends on / blocked
 
Reported: 2018-08-17 13:54 UTC by Filip Krska
Modified: 2020-01-20 11:27 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1622499 (view as bug list)
Environment:
Last Closed: 2019-08-06 12:52:25 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 3568881 0 None None None 2018-08-17 14:15:17 UTC
Red Hat Product Errata RHBA-2019:2127 0 None None None 2019-08-06 12:52:46 UTC

Description Filip Krska 2018-08-17 13:54:22 UTC 
Description of problem:

chronyc executed from ksh is denied to write to pipe (actually a socket) with AVC:

type=AVC msg=audit(1534512601.216:338): avc:  denied  { read write } for  pid=27459 comm="chronyc" path="socket:[48180]" dev="sockfs" ino=48180 scontext=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=unix_stream_socket


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

selinux-policy-3.13.1-215.el7.noarch

How reproducible:

always

Steps to Reproduce:
1.

# ksh -c "chronyc -n sources |grep '1'"

Actual results:

empty output

Expected results:

st like

210 Number of sources = 4
^? 195.21.152.161                0  10     0     -     +0ns[   +0ns] +/-    0ns
^? 72.30.35.89                   0  10     0     -     +0ns[   +0ns] +/-    0ns
^? 2600:3c03::f03c:91ff:feae:82c1   0   9     0     -     +0ns[   +0ns] +/-    0ns
^? 63.211.239.58                 0  10     0     -     +0ns[   +0ns] +/-    0ns

Additional info:

other shells don't trigger (different pipe handling)
by default no record in audit log, `semanage dontaudit off` needed to reveal
more AVCs occur after `semanage permissive -d chronyc_t`

type=AVC msg=audit(1534512601.216:338): avc:  denied  { read write } for  pid=27459 comm="chronyc" path="socket:[48180]" dev="sockfs" ino=48180 scontext=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=unix_stream_socket
type=SYSCALL msg=audit(1534512601.216:338): arch=c000003e syscall=59 success=yes exit=0 a0=7ff823cccc29 a1=7ff823ccc6b0 a2=7ff823ccca38 a3=0 items=0 ppid=27458 pid=27459 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=2 comm="chronyc" exe="/usr/bin/chronyc" subj=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 key=(null)
type=PROCTITLE msg=audit(1534512601.216:338): proctitle=6368726F6E7963002D6E00736F7572636573
type=AVC msg=audit(1534512601.218:339): avc:  denied  { ioctl } for  pid=27459 comm="chronyc" path="socket:[48180]" dev="sockfs" ino=48180 scontext=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=unix_stream_socket
type=SYSCALL msg=audit(1534512601.218:339): arch=c000003e syscall=16 success=no exit=-25 a0=1 a1=5401 a2=7ffd56fca780 a3=56505e9ad0dd items=0 ppid=27458 pid=27459 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=2 comm="chronyc" exe="/usr/bin/chronyc" subj=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 key=(null)
type=PROCTITLE msg=audit(1534512601.218:339): proctitle=6368726F6E7963002D6E00736F7572636573
type=AVC msg=audit(1534512601.220:340): avc:  denied  { getattr } for  pid=27459 comm="chronyc" path="socket:[48180]" dev="sockfs" ino=48180 scontext=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=unix_stream_socket
type=SYSCALL msg=audit(1534512601.220:340): arch=c000003e syscall=5 success=yes exit=0 a0=1 a1=7ffd56fc8cb0 a2=7ffd56fc8cb0 a3=56505e9ad072 items=0 ppid=27458 pid=27459 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=2 comm="chronyc" exe="/usr/bin/chronyc" subj=unconfined_u:unconfined_r:chronyc_t:s0-s0:c0.c1023 key=(null)
type=PROCTITLE msg=audit(1534512601.220:340): proctitle=6368726F6E7963002D6E00736F7572636573
Comment 10 errata-xmlrpc 2019-08-06 12:52:25 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-2019:2127
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