| Summary: | mimedefang.pl's invocation of send_mail() causes an exception | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Philip Prindeville <philipp> |
| Component: | selinux-policy-targeted | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED ERRATA | QA Contact: | Ben Levenson <benl> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 16 | CC: | dwalsh, philipp |
| Target Milestone: | --- | Keywords: | Reopened |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.10.0-61.fc16 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-11-30 01:59:54 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
dgrift provided the following sample fix: policy_module(myspamd, 1.0.0) gen_require(` type spamd_t; ') mta_send_mail(spamd_t) which seems to be working. Looks fine. Will add. Please let me know when it's been checked in so I can do a mockbuild and try it out. When is the next release of selinux-policy due out? A new build will be available from koji today. (In reply to comment #5) > A new build will be available from koji today. Can you post the URL? Thanks. (In reply to comment #7) > http://koji.fedoraproject.org/koji/buildinfo?buildID=243234 Please also provide an f15 build. It should be fixed in the latest F15 policy. Seeing:
type=AVC msg=audit(1303278926.626:27678): avc: denied { execute } for pid=13089 comm="mimedefang.pl" name="sendmail.sendmail" dev=sda3 ino=267135 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file
Was caused by:
Unknown - would be allowed by active policy
Possible mismatch between this policy and the one under which the audit message was generated.
Possible mismatch between current in-memory boolean settings vs. permanent ones.
Philip, try to execute # yum reinstall selinux-policy-targeted Hmmm... hard to tell. I did that, but running:
audit2why < /var/log/audit/audit.log
doesn't bother to give me recognizable timestamps, so it's hard to tell if the last occurrence of that message was before or after refreshing the package.
Is there a way to get audit2why to spew meaningful timestamps instead of seconds since the epoch (which I have to admit, I can't convert in my head)...
Ok, doing a little work:
[philipp@builder ~]$ cat /tmp/y2
#!/usr/bin/perl
my $sec = 1303278926;
use POSIX qw(strftime);
print strftime("%a %b %e %H:%M:%S %Y", localtime($sec)), "\n";
[philipp@builder ~]$ /tmp/y2
Tue Apr 19 23:55:26 2011
[philipp@builder ~]$
Ok, so it seems that I've not seen it in a while.
ausearch is the tool that will translate the time stamps, I also run it with the -i flag to translate UID and syscall info. (In reply to comment #11) > Philip, > > try to execute > > # yum reinstall selinux-policy-targeted It seems to be working. Please go ahead and close this. I'm running: selinux-policy-targeted-3.9.16-26.fc15.noarch without incident. Ok, thanks. This seems to have regressed.
type=AVC msg=audit(11/23/2011 00:07:37.218:572) : avc: denied { execute } for pid=11464 comm=mimedefang.pl name=sendmail.sendmail dev=sda3 ino=266985 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file
type=AVC msg=audit(11/23/2011 00:07:37.339:573) : avc: denied { execute } for pid=11467 comm=mimedefang.pl name=sendmail.sendmail dev=sda3 ino=266985 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file
type=AVC msg=audit(11/23/2011 01:01:57.074:583) : avc: denied { execute } for pid=11623 comm=mimedefang.pl name=sendmail.sendmail dev=sda3 ino=266985 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file
type=AVC msg=audit(11/23/2011 01:01:57.196:584) : avc: denied { execute } for pid=11626 comm=mimedefang.pl name=sendmail.sendmail dev=sda3 ino=266985 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file
I'm running:
selinux-policy-targeted-3.10.0-56.fc16.noarch
selinux-policy-3.10.0-56.fc16.noarch
audit2allow tells me we need:
module mimedefang 1.0;
require {
type spamd_t;
type sendmail_exec_t;
class file execute;
}
#============= spamd_t ==============
allow spamd_t sendmail_exec_t:file execute;
or at least merge this with existing policy.
Added to F16. selinux-policy-3.10.0-59.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/selinux-policy-3.10.0-59.fc16 Package selinux-policy-3.10.0-60.fc16: * should fix your issue, * was pushed to the Fedora 16 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.10.0-60.fc16' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2011-16371/selinux-policy-3.10.0-60.fc16 then log in and leave karma (feedback). Package selinux-policy-3.10.0-61.fc16: * should fix your issue, * was pushed to the Fedora 16 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.10.0-61.fc16' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2011-16371/selinux-policy-3.10.0-61.fc16 then log in and leave karma (feedback). (In reply to comment #21) > Package selinux-policy-3.10.0-61.fc16: > * should fix your issue, > * was pushed to the Fedora 16 testing repository, > * should be available at your local mirror within two days. > Update it with: > # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.10.0-61.fc16' > as soon as you are able to. > Please go to the following url: > https://admin.fedoraproject.org/updates/FEDORA-2011-16371/selinux-policy-3.10.0-61.fc16 > then log in and leave karma (feedback). Was there a reason to not fix 753962 in build .61? yes, i was ill and 60, 61 releases contain only q spec file change, not policy changes. selinux-policy-3.10.0-61.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report. Is this in master/rawhide as well as f16? Yes, it is. |
Description of problem: If a user's homegrown mimedefang-filter should invoke send_mail() to deliver a message to a quarantine or postmaster mailbox (as we do locally) instead of using procmail to do so, this may cause the following issues: Apr 19 23:55:30 mail setroubleshoot: SELinux is preventing /usr/sbin/sendmail.sendmail from execute access on the file /usr/sbin/sendmail.sendmail. For complete SELinux messages. run sealert -l 663766c4-a1d7-4269-a46c-9bc7952715b7 # sealert -l 663766c4-a1d7-4269-a46c-9bc7952715b7 SELinux is preventing /usr/sbin/sendmail.sendmail from execute access on the file /usr/sbin/sendmail.sendmail. ***** Plugin catchall (100. confidence) suggests *************************** If you believe that sendmail.sendmail should be allowed execute access on the sendmail.sendmail file by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # grep sendmail /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp and: # ausearch -m avc -ts yesterday ... ---- time->Tue Apr 19 23:55:26 2011 type=SYSCALL msg=audit(1303278926.552:27677): arch=c000003e syscall=59 success=no exit=-13 a0=4c0a0a0 a1=4dd1a70 a2=e2f140 a3=8 items=0 ppid=12394 pid=13086 auid=4294967295 uid=491 gid=478 euid=491 suid=491 fsuid=491 egid=478 sgid=478 fsgid=478 tty=(none) ses=4294967295 comm="mimedefang.pl" exe="/usr/bin/perl" subj=system_u:system_r:spamd_t:s0 key=(null) type=AVC msg=audit(1303278926.552:27677): avc: denied { execute } for pid=13086 comm="mimedefang.pl" name="sendmail.sendmail" dev=sda3 ino=267135 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file ---- time->Tue Apr 19 23:55:26 2011 type=SYSCALL msg=audit(1303278926.626:27678): arch=c000003e syscall=59 success=no exit=-13 a0=4c0a0a0 a1=4b431b0 a2=e2f140 a3=8 items=0 ppid=12394 pid=13089 auid=4294967295 uid=491 gid=478 euid=491 suid=491 fsuid=491 egid=478 sgid=478 fsgid=478 tty=(none) ses=4294967295 comm="mimedefang.pl" exe="/usr/bin/perl" subj=system_u:system_r:spamd_t:s0 key=(null) type=AVC msg=audit(1303278926.626:27678): avc: denied { execute } for pid=13089 comm="mimedefang.pl" name="sendmail.sendmail" dev=sda3 ino=267135 scontext=system_u:system_r:spamd_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=file Version-Release number of selected component (if applicable): selinux-policy-targeted-3.9.7-37.fc14.noarch How reproducible: Call send_mail() from within mimedefang-filter with a message to deliver. Steps to Reproduce: 1. 2. 3. Actual results: If policy is "enforcing", the delivery will fail and mimedefang will report that a delivery error occurred, causing the sender to reattempt delivery later. Eventually the sender will time out and give up (after 5 days or so). Expected results: Even with policy "enforcing", this is a legitimate scenario to have mimedefang deliver quarantined messages into postmaster's mailbox. Additional info: