root vs system cron jobs (MLS_LEVEL)
Nikolas Lam
nlam87346 at library.usyd.edu.au
Thu Nov 20 09:03:03 UTC 2008
Hi
On Fedora 9, we've got a symlink in /etc/cron.daily/
to /usr/local/bin/checkmailspool which ultimately tries to run
/usr/sbin/postqueue -p
It works if you call it via the root user's crontab, but not when you
put the script in /etc/cron.daily/. (I've included the sealert output
below).
When called by the "system" cron (in which the denial occurs) id -Z
output is
system_u:system_r:system_crond_t:s0-s0:c0.c1023
OTOH, the root cron (which works) shows
root:unconfined_r:unconfined_t:s0-s0:c0.c1023
I've just read crontab(5) which mentions setting MLS_LEVEL on the first
line of the crontab, but it seems to suggest that this would apply
(perhaps unnecessarily) to all the jobs run in that crontab.
What's the recommended method to get this one script working from
within /etc/cron.daily/ ?
Regards,
Nik Lam
Summary:
SELinux is preventing postqueue (postfix_postqueue_t) "connectto" to
/var/spool/postfix/public/showq (unconfined_t).
Detailed Description:
SELinux denied access requested by postqueue. It is not expected that
this
access is required by postqueue and this access may signal an intrusion
attempt.
It is also possible that the specific version or configuration of the
application is causing it to require additional access.
Allowing Access:
You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can
disable
SELinux protection altogether. Disabling SELinux protection is not
recommended.
Please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.
Additional Information:
Source Context
system_u:system_r:postfix_postqueue_t:s0-s0:c0.c10
23
Target Context
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
023
Target Objects /var/spool/postfix/public/showq [
unix_stream_socket ]
Source postqueue
Source Path /usr/sbin/postqueue
Port <Unknown>
Host replaced.example.com
Source RPM Packages postfix-2.5.5-1.fc9
Target RPM Packages
Policy RPM selinux-policy-3.3.1-107.fc9
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name catchall
Host Name replaced.example.com
Platform Linux replaced.example.com
2.6.25.14-108.fc9.i686 #1 SMP Mon Aug 4
14:08:11
EDT 2008 i686 i686
Alert Count 38
First Seen Tue Nov 4 05:04:42 2008
Last Seen Thu Nov 20 05:04:42 2008
Local ID f5f4066b-d167-44ca-9c00-afd71f485225
Line Numbers
Raw Audit Messages
host=replaced.example.com type=AVC msg=audit(1227117882.675:17773): avc:
denied { connectto } for pid=15651 comm="postqueue"
path="/var/spool/postfix/public/showq"
scontext=system_u:system_r:postfix_postqueue_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tclass=unix_stream_socket
host=replaced.example.com type=SYSCALL msg=audit(1227117882.675:17773):
arch=40000003 syscall=102 success=no exit=-13 a0=3 a1=bfa89e00
a2=b808eff4 a3=bfa89e6a items=0 ppid=15647 pid=15651 auid=0 uid=0 gid=0
euid=0 suid=0 fsuid=0 egid=90 sgid=90 fsgid=90 tty=(none) ses=2419
comm="postqueue" exe="/usr/sbin/postqueue"
subj=system_u:system_r:postfix_postqueue_t:s0-s0:c0.c1023 key=(null)
More information about the fedora-selinux-list
mailing list