Bug 618956

Summary: SELinux is preventing /usr/sbin/exim "dac_override" access .
Product: [Fedora] Fedora Reporter: Frank Murphy <sysoutfran>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 14CC: dwalsh, joe.christy, mgrepl, sysoutfran
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard: setroubleshoot_trace_hash:dc211670da98847bec2958f8b7eaacb0f8b0a2c47e25050a4ede2c6e52591125
Fixed In Version: selinux-policy-3.8.8-20.fc14 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-09-01 06:03:03 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
sealert dac_override
none
ausearch -m avc none

Description Frank Murphy 2010-07-28 07:51:41 UTC 
Summary:

SELinux is preventing /usr/sbin/exim "dac_override" access .

Detailed Description:

[sendmail has a permissive type (logwatch_mail_t). This access was not denied.]

SELinux denied access requested by sendmail. It is not expected that this access
is required by sendmail and this access may signal an intrusion attempt. It is
also possible that the specific version or configuration of the application is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://docs.fedoraproject.org/selinux-faq-fc5/#id2961385) Please file a bug
report.

Additional Information:

Source Context                system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023
Target Context                system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023
Target Objects                None [ capability ]
Source                        sendmail
Source Path                   /usr/sbin/exim
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           exim-4.72-1.fc13
Target RPM Packages           
Policy RPM                    selinux-policy-3.7.19-41.fc13
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed)
                              2.6.33.6-147.fc13.x86_64 #1 SMP Tue Jul 6 22:32:17
                              UTC 2010 x86_64 x86_64
Alert Count                   4
First Seen                    Wed 28 Jul 2010 08:17:03 IST
Last Seen                     Wed 28 Jul 2010 08:17:03 IST
Local ID                      6db01112-d739-4f12-9eca-685c0ec6d9e0
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1280301423.798:31186): avc:  denied  { dac_override } for  pid=4529 comm="sendmail" capability=1  scontext=system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 tcontext=system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 tclass=capability

node=(removed) type=AVC msg=audit(1280301423.798:31186): avc:  denied  { dac_read_search } for  pid=4529 comm="sendmail" capability=2  scontext=system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 tcontext=system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 tclass=capability

node=(removed) type=SYSCALL msg=audit(1280301423.798:31186): arch=c000003e syscall=80 success=yes exit=128 a0=7f2402ddcc60 a1=7fff4371db20 a2=0 a3=7fff4371d890 items=0 ppid=4479 pid=4529 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=2 comm="sendmail" exe="/usr/sbin/exim" subj=system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 key=(null)



Hash String generated from  catchall,sendmail,logwatch_mail_t,logwatch_mail_t,capability,dac_override
audit2allow suggests:

#============= logwatch_mail_t ==============
allow logwatch_mail_t self:capability { dac_read_search dac_override };
Comment 1 Miroslav Grepl 2010-07-28 08:36:53 UTC 
Can you add this command

auditctl -w /etc/shadow -p w 

And see if you can generate the error again.  Then you should get a path with
the next avc message.

Please attach the message
Comment 2 Frank Murphy 2010-07-29 08:31:32 UTC 
Created attachment 435223 [details]
sealert dac_override
Comment 3 Frank Murphy 2010-07-29 08:37:29 UTC 
(In reply to comment #1)
> Can you add this command
> 
> auditctl -w /etc/shadow -p w 
> 
> And see if you can generate the error again.  Then you should get a path with
> the next avc message.
> 
> Please attach the message    

Ran the command last night as root (su), hope that was correct.
Attached is the avc from this morning.
Comment 4 Daniel Walsh 2010-07-29 14:39:55 UTC 
Can you get the full output of 

ausearch -m avc
Comment 5 Frank Murphy 2010-07-29 14:56:18 UTC 
Created attachment 435324 [details]
ausearch -m avc
Comment 6 Daniel Walsh 2010-07-29 16:05:01 UTC 
Miroslav,

Add


allow logwatch_mail_t self:capability { dac_read_search dac_override };
to logwatch.te

For reading all log files.


Change mta.te exim calls to 


optional_policy(`
	exim_domtrans(user_mail_domain)
	exim_manage_log(user_mail_domain)
')
Comment 7 Miroslav Grepl 2010-08-02 12:47:35 UTC 
Fixed in selinux-policy-3.7.19-42.fc13
Comment 8 Frank Murphy 2010-08-02 14:02:57 UTC 
Am getting this in F14 Branched now
Current installed policy: 
Source RPM Packages           exim-4.71-4.fc14
Policy RPM                    selinux-policy-3.8.8-8.fc14
Comment 9 Daniel Walsh 2010-08-03 17:40:46 UTC 
Fixed in selinux-policy-3.8.8-9.fc14
Comment 10 Fedora Update System 2010-08-25 03:11:18 UTC 
selinux-policy-3.8.8-20.fc14 has been submitted as an update for Fedora 14.
http://admin.fedoraproject.org/updates/selinux-policy-3.8.8-20.fc14
Comment 11 Fedora Update System 2010-08-25 13:31:03 UTC 
selinux-policy-3.8.8-20.fc14 has been pushed to the Fedora 14 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update selinux-policy'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/selinux-policy-3.8.8-20.fc14
Comment 12 Fedora Update System 2010-08-26 18:37:24 UTC 
selinux-policy-3.8.8-20.fc14 has been pushed to the Fedora 14 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update selinux-policy'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/selinux-policy-3.8.8-20.fc14
Comment 13 Fedora Update System 2010-09-01 06:01:36 UTC 
selinux-policy-3.8.8-20.fc14 has been pushed to the Fedora 14 stable repository.  If problems still persist, please make note of it in this bug report.