Re: permission problems with script run via crondargs -m

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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

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