Bug 987778 - selinux prevents dyntransition with sshd
selinux prevents dyntransition with sshd
Status: CLOSED NOTABUG
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy (Show other bugs)
7.0
Unspecified Unspecified
unspecified Severity medium
: rc
: ---
Assigned To: Miroslav Grepl
BaseOS QE Security Team
:
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2013-07-24 03:11 EDT by David Spurek
Modified: 2015-03-02 00:27 EST (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2013-07-24 04:18:54 EDT
Type: Bug
Regression: ---
Mount Type: ---
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CRM:
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Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description David Spurek 2013-07-24 03:11:22 EDT
Description of problem:
selinux prevents dyntransition with sshd.

ausearch output:

----
time->Wed Jul 24 02:24:21 2013
type=SYSCALL msg=audit(1374647061.593:2024): arch=c000003e syscall=1 success=no exit=-13 a0=8 a1=7fa07e96e590 a2=36 a3=666e6f636e753a72 items=0 ppid=25992 pid=26005 auid=0 uid=9999 gid=9999 euid=9999 suid=9999 fsuid=9999 egid=9999 sgid=9999 fsgid=9999 ses=70 tty=pts0 comm="sshd" exe="/usr/sbin/sshd" subj=unconfined_u:system_r:unconfined_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1374647061.593:2024): avc:  denied  { dyntransition } for  pid=26005 comm="sshd" scontext=unconfined_u:system_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process

part of log from sshd server:

debug1: SELinux support enabled [preauth]
debug3: ssh_selinux_change_context: setting context from 'unconfined_u:system_r:
unconfined_t:s0-s0:c0.c1023' to 'unconfined_u:system_r:sshd_net_t:s0-s0:c0.c1023
' [preauth]
debug3: ssh_selinux_change_context: setcon unconfined_u:system_r:sshd_net_t:s0-s
0:c0.c1023 from unconfined_u:system_r:unconfined_t:s0-s0:c0.c1023 failed with Pe
rmission denied [preauth]

Version-Release number of selected component (if applicable):
selinux-policy-3.12.1-63.el7
openssh-6.2p2-3.el7

How reproducible:
always

Steps to Reproduce:
1.run reproduce test
2.
3.

Actual results:
AVC message, in log of ssh server i see - ssh_selinux_change_context: failed with Permission denied [preauth] 

Expected results:
no AVC message, no problem with ssh_selinux_change_context in sshd log

Additional info:
Comment 2 Miroslav Grepl 2013-07-24 04:18:54 EDT
David,
basically it means that the sshd daemon is running with the bad context. Did you start it by hand?

Are you trying to debug sshd?

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