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
In /etc/crontab I put:
30 * * * * root /bin/ls
And it ran fine creating /var/spool/mail/root with the proper content
via mycron script.
So I will have to wait until 3am tonight to see what logwatch does this
time.
Oh, and here is what ausearch reports:
# ausearch -m AVC,USER_AVC -ts today
----
time->Mon May 11 03:43:06 2020
type=AVC msg=audit(1589182986.533:3571): avc: denied { add_name } for
pid=121331 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
Thanks,
Lukas.
Then we can help you,
Thanks,
Lukas.
Now I did update mycron in between. Will I have to run this every time
I update mycron? How do I make it permanent? Also right now there is
no /var/spool/mail/root mbox file.
thanks
_______________________________________________
selinux mailing list -- selinux@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to selinux-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/selinux@xxxxxxxxxxxxxxxxxxxxxxx
