Bug 987778 - selinux prevents dyntransition with sshd
Summary: selinux prevents dyntransition with sshd
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
medium
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-07-24 07:11 UTC by David Spurek
Modified: 2015-03-02 05:27 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-07-24 08:18:54 UTC
Target Upstream Version:


Attachments (Terms of Use)

Description David Spurek 2013-07-24 07:11:22 UTC
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 08:18:54 UTC
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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