On 5/12/20 11:36 AM, Lukas Vrabec wrote:
On 5/12/20 1:31 PM, Robert Moskowitz wrote:
Lukas,
Failed again last night see the end of this message.
On 5/11/20 9:40 AM, Lukas Vrabec wrote:
On 5/11/20 3:19 PM, Robert Moskowitz wrote:
On 5/11/20 9:04 AM, Lukas Vrabec wrote:
On 5/11/20 2:23 PM, Robert Moskowitz wrote:
A little background first.
This is for Fedora 32 workstation which does not come with a
default MTA
and thus there is a slight challenge (ahem) getting CRON's output into
the local mailstore. I don't want to install an MTA (leave why for
Fedora users list discuss) and "procmail -f cron" leaves out a DATE
header. So I wrote my own little script that I put in
/usr/local/mycron
that takes the output from cron and appends the proper content to
/var/spool/mail/$USER.
Works fine for my personal crontab, but has selinux problems for
logwatch running as root (and probably any other cron task running as
root).
So I first got told by selinux troubleshooting that I needed:
ausearch -c 'mycron' --raw | audit2allow -M my-mycron
semodule -X 300 -i my-mycron.pp
Which I did. Then after this night's run of logwatch, I see that I
have
the selinux troubleshoot icon, but when I look, it is empty? So I grep
messages for logwatch, then grep the time it was running and found the
following:
May 11 03:43:19 lx140e setroubleshoot[121345]: SELinux is preventing
mycron from add_name
access on the directory root. For complete SELinux messages run:
sealert
-l 8eb93a73-c7ff-
42ec-bee1-594d77540808
May 11 03:43:19 lx140e python3[121345]: SELinux is preventing mycron
from add_name access
on the directory root.#012#012***** Plugin catchall (100. confidence)
suggests ********
******************#012#012If you believe that mycron should be allowed
add_name access on
the root directory by default.#012Then you should report this as a
bug.#012You can generat
e a local policy module to allow this access.#012Do#012allow this
access
for now by execut
ing:#012# ausearch -c 'mycron' --raw | audit2allow -M my-mycron#012#
semodule -X 300 -i my
-mycron.pp#012
May 11 03:43:23 lx140e systemd[1]:
dbus-:1.1-org.fedoraproject.Setroubleshootd@15.service:
Succeeded.
So it looks like now I am told to run:
ausearch -c 'mycron' --raw | audit2allow -M my-mycron
semodule -X 300 -i my-mycron.pp
Wait, that is the same I ran earlier? And why did I have to grep
messages to find these?
Hi,
Could you please share output of this command:
# sealert -l 8eb93a73-c7ff-42ec-bee1-594d77540808
# sealert -l 8eb93a73-c7ff-42ec-bee1-594d77540808
Error
query_alerts error (1003): id (8eb93a73-c7ff-42ec-bee1-594d77540808) not
found
And from the first selinux alert:
# sealert -l d05d8373-fae7-447e-b45a-74940959809e
Error
query_alerts error (1003): id (d05d8373-fae7-447e-b45a-74940959809e) not
found
I viewed the alerts with the SELinux troubleshooter, but I did NOT tell
it to delete the alert :(
No problem, are you able to reproduce it? If yes, please do and then
attach:
# ausearch -m AVC,USER_AVC -ts today
# ausearch -m AVC,USER_AVC -ts today
----
time->Tue May 12 03:22:06 2020
type=AVC msg=audit(1589268126.630:3796): avc: denied { add_name } for
pid=142359 comm="mycron" name="root"
scontext=system_u:system_r:logwatch_t:s0-s0:c0.c1023
tcontext=system_u:object_r:mail_spool_t:s0 tclass=dir permissive=0
May 12 03:22:06 lx140e audit[142359]: AVC avc: denied { add_name }
for pid=142359 comm="mycron" name="root"
scontext=system_u:system_r:logwatch_t:s0-s0:c0.c1023
tcontext=system_u:object_r:mail_spool_t:s0 tclass=dir permissive=0
May 12 03:22:09 lx140e systemd[1]: Started
dbus-:1.1-org.fedoraproject.Setroubleshootd@20.service.
May 12 03:22:09 lx140e audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.1-org.fedoraproject.Setroubleshootd@20 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
May 12 03:22:13 lx140e systemd[1]: Started
dbus-:1.1-org.fedoraproject.SetroubleshootPrivileged@10.service.
May 12 03:22:13 lx140e audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.1-org.fedoraproject.SetroubleshootPrivileged@10
comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=?
terminal=? res=success'
May 12 03:22:19 lx140e setroubleshoot[142374]: SELinux is preventing
mycron from add_name access on the directory root. For complete SELinux
messages run: sealert -l 9fd5890f-400b-4ae0-8a98-43575ac4913a
May 12 03:22:19 lx140e python3[142374]: SELinux is preventing mycron
from add_name access on the directory root.#012#012***** Plugin
catchall (100. confidence) suggests **************************#012#012If
you believe that mycron should be allowed add_name access on the root
directory by default.#012Then you should report this as a bug.#012You
can generate a local policy module to allow this access.#012Do#012allow
this access for now by executing:#012# ausearch -c 'mycron' --raw |
audit2allow -M my-mycron#012# semodule -X 300 -i my-mycron.pp#012
May 12 03:22:23 lx140e systemd[1]:
dbus-:1.1-org.fedoraproject.Setroubleshootd@20.service: Succeeded.
May 12 03:22:23 lx140e audit[1]: SERVICE_STOP pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.1-org.fedoraproject.Setroubleshootd@20 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
May 12 03:22:23 lx140e systemd[1]:
dbus-:1.1-org.fedoraproject.Setroubleshootd@20.service: Consumed 3.306s
CPU time.
May 12 03:22:25 lx140e systemd[1]:
dbus-:1.1-org.fedoraproject.SetroubleshootPrivileged@10.service: Succeeded.
May 12 03:22:25 lx140e audit[1]: SERVICE_STOP pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.1-org.fedoraproject.SetroubleshootPrivileged@10
comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=?
terminal=? res=success'
May 12 03:22:25 lx140e systemd[1]:
dbus-:1.1-org.fedoraproject.SetroubleshootPrivileged@10.service:
Consumed 5.271s CPU time.
# sealert -l 9fd5890f-400b-4ae0-8a98-43575ac4913a
Error
query_alerts error (1003): id (9fd5890f-400b-4ae0-8a98-43575ac4913a) not
found
Can you attach your "mycron" script? THere is some issue with SELinux
domain transition.
I just made a few improvements to it, but here is what ran last night:
local]# cat mycron
#!/bin/sh
# the sed commands only work if USER == MAILTO in crontab
exec 3>> /var/spool/mail/$USER
exec 100>/var/tmp/$USERlock.lock || exit 1
flock -w 120 100 || exit 1
currentDate=$(date +'%a %b %d %T %Y')
echo "From cron@localhost $currentDate" >&3
currentDate2=$(date +'%a, %e %b %Y %T %z (%Z)')
echo "Date: $currentDate2" >&3
echo "Message-ID: $(uuidgen)@$HOSTNAME" >&3
# (cat) >&3
(sed -e "/^From: / s/$USER/$USER@$HOSTNAME/"|sed -e "/^To: /
s/$USER/$USER@$HOSTNAME/") >&3
echo "" >&3
The flock stuff was added yesterday, and was not in the previous failures.
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