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Bug 1622509

Summary: chronyc cannot write to pipe (socket when executed from ksh)
Product: [Fedora] Fedora Reporter: Filip Krska <fkrska>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 29CC: dwalsh, lvrabec, mgrepl, mmalik, plautrba, pmoore, qe-baseos-security, ssekidde, vmojzis
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: selinux-policy-3.14.2-34.fc29 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1622499 Environment:
Last Closed: 2018-09-12 02:59:05 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:

Description Filip Krska 2018-08-27 11:11:36 UTC 
ksh-20120801-248.fc29.x86_64
selinux-policy-3.14.2-26.fc29.noarch

reproduces as well

+++ This bug was initially created as a clone of Bug #1618757 +++

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 1 Fedora Update System 2018-09-11 12:52:40 UTC 
selinux-policy-3.14.2-34.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2018-db240a1726
Comment 2 Fedora Update System 2018-09-12 02:59:05 UTC 
selinux-policy-3.14.2-34.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.