Bug 1770570

Summary: SELinux prevents sendmail started from DKIM milter to work
Product: [Fedora] Fedora Reporter: Göran Uddeborg <goeran>
Component: selinux-policy-targetedAssignee: Patrik Koncity <pkoncity>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 31CC: dwalsh, lvrabec, mmalik
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Last Closed: 2020-02-01 01:30:42 UTC Type: Bug
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Description Flags
AVCs triggered in permissive mode none

Description Göran Uddeborg 2019-11-10 15:51:55 UTC 
Description of problem:
After the fix of bug 1757950, opendkim is now able to _execute_ sendmail.  But the sendmail process is still not able to deliver any mail.


Version-Release number of selected component (if applicable):
selinux-policy-targeted-3.14.4-39.fc31.noarch


How reproducible:
Every time


Steps to Reproduce:
1. Configure sendmail to use opendkim
2. Give it a mail with a broken dkim signature


Actual results:
No warning mail, and two AVCs:

----
time->Sun Nov 10 16:33:26 2019
type=AVC msg=audit(1573400006.845:32261): avc:  denied  { setrlimit } for  pid=212036 comm="sendmail" scontext=system_u:system_r:dkim_milter_t:s0 tcontext=system_u:system_r:dkim_milter_t:s0 tclass=process permissive=0
----
time->Sun Nov 10 16:33:26 2019
type=AVC msg=audit(1573400006.845:32262): avc:  denied  { search } for  pid=212036 comm="sendmail" name="clientmqueue" dev="dm-0" ino=5193760 scontext=system_u:system_r:dkim_milter_t:s0 tcontext=system_u:object_r:mqueue_spool_t:s0 tclass=dir permissive=0


Additional info:
I notice the sendmail binary has type sendmail_exec_t.  Maybe the correct fix here is not to allow those operations, but to allow dkim_milter_t to transition into sendmail_t?
Comment 1 Patrik Koncity 2019-11-19 11:06:36 UTC 
Hi, 
can you put SELinux to permissive?
via #seteneforce 0
then reproduce situation and send AVCs which you have in permissive?

Thank you,
Patrik
Comment 2 Göran Uddeborg 2019-11-19 13:22:18 UTC 
Created attachment 1637652 [details]
AVCs triggered in permissive mode

At you service!
Comment 3 Lukas Vrabec 2020-01-03 15:54:17 UTC 
commit 32a849cbbb1855f7deb0def876f1728d3571ca49 (HEAD -> rawhide, origin/rawhide, origin/HEAD)
Author: Patrik Koncity <pkoncity>
Date:   Fri Nov 29 11:05:49 2019 +0100

    Update milter policy to allow use sendmail
    
    Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1770570
    Add macro to allow dkim_milter_t domain to manage mail queue files
    in domain mqueue_spool_t
    Allow dkim_milter_t domain to set own process resource limit
    Allow dkim_milter_t domain to get attributes of filesystem
    Allow dkim_milter_t domain to connect simple mail transfer protocol port
Comment 4 Fedora Update System 2020-01-31 01:28:38 UTC 
selinux-policy-3.14.4-45.fc31 has been pushed to the Fedora 31 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-bb42099a17
Comment 5 Fedora Update System 2020-02-01 01:30:42 UTC 
selinux-policy-3.14.4-45.fc31 has been pushed to the Fedora 31 stable repository. If problems still persist, please make note of it in this bug report.