Re: Defaults of CentOS Install not working with SELinux

Andrew Colin Kissa <andrew@xxxxxxxxxxxxx> · Thu, 30 Apr 2009 17:11:09 +0200

The audit.log should contain more detail than is being provided here, if it is a unix socket you should see the path, i suspect it is the unix socket not the tcp sockets (pop3/imap)

On 30 Apr 2009, at 4:50 PM, Dan Roberts wrote:

Ok, but how?  
There appear to be a lot of different options when employing audit2allow and I am reluctant to start blazing away trying different elements.  I am missing the details of what socket an dhow the execution is occuring so that I can begin to develop the proper audit2allow sequence.

On Apr 30, 2009, at 8:43 AM, Andrew Colin Kissa wrote:

Hi

Dovecot is trying to open a socket, and procmail is trying to execute spamc, You should be able to fix these issues using audit2allow.

Andrew.

On 30 Apr 2009, at 4:07 PM, Dan Roberts wrote:

Following a hard drive corruption I have reinstalled the latest version of CentOS and all current patch files.
For most applications I selected the default options.  By doing this I expected that the packages would play nice with one another and I could customize as necessary.

Setting SELinux to enforce I encountered all sorts of problems - but most were resolvable, save for Dovecot, Procmail (for spamc), and an odd one with Apache.

Given that these were all installed with the CentOS install defaults, I can't believe I am the only one with these issues but finding a solution has not been self evident.  Hoping someone here can help.

For Dovecot I get the following:
	SELinux is preventing dovecot (dovecot_t) "create" to <Unknown> (dovecot_t). For complete SELinux messages. run sealert -l e1b070ab-586a-4c5a-befe-b6a46b9ab992

For procmail I get the following:
	SELinux is preventing procmail (procmail_t) "execute" to ./spamc (spamc_exec_t). For complete SELinux messages. run sealert -l 0a554689-4948-4edf-9964-dddbfe6a2492
	SELinux is preventing sh (procmail_t) "read" to ./spamc (spamc_exec_t). For complete SELinux messages. run sealert -l 1f1ebd83-412d-4e93-a36f-6f3d34c663df

For Apache it's even more strange - When started I get:
	Syntax error on line 283 of /etc/httpd/conf/httpd.conf
	DocumentRoot must be  directory

But it is a directory, has the correct permissions and I have even run chcon -R -h -t httpd_sys_content_t /web/www/ in an effort to correct the problem.  I run a virtual server too, and in trying to find a fix for this that may be a problem - but first things first.

All the other issues I had I could resolve when I ran the specified "sealert" tag and followed the suggested instructions - but those above don't budge.  When I go to the fedora.redhat.com/docs/selinux-fq-fc5 site to take on making a local policy module I am quickly getting lost .   The option to simply disable SElinux with respect to Apache, Dovecote or anything else is suggested - but not something I see in the GUI window, and I have not figured out how to do it from the command line.

Again, because these are default packages, I hope that someone else knows how to resolve these.

With respect to the to reports from SELinux regarding Dovecot and promail, here is a bit more info: 

The info and Raw Audit message for dovecot_t is:
	Source Context                system_u:system_r:dovecot_t:s0
	Target Context                system_u:system_r:dovecot_t:s0
	Target Objects                None [ socket ]
	Source                        dovecot
	Source Path                   /usr/sbin/dovecot
	Port                          <Unknown>
	Host                          trailrunner
	Source RPM Packages           dovecot-1.0.7-7.el5
	Target RPM Packages          
	Policy RPM                    selinux-policy-2.4.6-203.el5
	Selinux Enabled               True
	Policy Type                   targeted
	MLS Enabled                   True
	Enforcing Mode                Enforcing
	Plugin Name                   catchall
	Host Name                     trailrunner
	Platform                      Linux trailrunner 2.6.18-128.1.6.el5xen #1 SMP Wed
	                              Apr 1 10:38:05 EDT 2009 i686 athlon
	Alert Count                   2
	First Seen                    Wed Apr 29 15:39:51 2009
	Last Seen                     Wed Apr 29 15:47:31 2009
	Local ID                      e1b070ab-586a-4c5a-befe-b6a46b9ab992
	Line Numbers                  

	Raw Audit Messages
	host=trailrunner type=AVC msg=audit(1241041651.976:33): avc:  denied  { create } for  pid=3884 comm="dovecot" scontext=system_u:system_r:dovecot_t:s0 tcontext=system_u:system_r:dovecot_t:s0 tclass=socket
	host=trailrunner type=SYSCALL msg=audit(1241041651.976:33): arch=40000003 syscall=102 success=no exit=-13 a0=1 a1=bf851070 a2=9e45030 a3=3e1 items=0 ppid=3883 pid=3884 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="dovecot" exe="/usr/sbin/dovecot" subj=system_u:system_r:dovecot_t:s0 key=(null)

The Raw Audit Message for Procmail is:
	Source Context                system_u:system_r:procmail_t:s0
	Target Context                system_u:object_r:spamc_exec_t:s0
	Target Objects                ./spamc [ file ]
	Source                        procmail
	Source Path                   /usr/bin/procmail
	Port                          <Unknown>
	Host                          trailrunner
	Source RPM Packages           procmail-3.22-17.1.el5.centos
	Target RPM Packages          
	Policy RPM                    selinux-policy-2.4.6-203.el5
	Selinux Enabled               True
	Policy Type                   targeted
	MLS Enabled                   True
	Enforcing Mode                Enforcing
	Plugin Name                   catchall_file
	Host Name                     trailrunner
	Platform                      Linux trailrunner 2.6.18-128.1.6.el5xen #1 SMP Wed
		                      Apr 1 10:38:05 EDT 2009 i686 athlon
	Alert Count                   29
	First Seen                    Wed Apr 29 15:40:40 2009
	Last Seen                     Wed Apr 29 16:25:40 2009
	Local ID                      0a554689-4948-4edf-9964-dddbfe6a2492
	Line Numbers                 

	Raw Audit Messages           
	host=trailrunner type=AVC msg=audit(1241043940.918:166): avc:  denied  { execute } for  pid=3344 comm="procmail" name="spamc" dev=dm-0 ino=18762675 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
	host=trailrunner type=SYSCALL msg=audit(1241043940.918:166): arch=40000003 syscall=11 success=no exit=-13 a0=8ef1d90 a1=8ef1020 a2=8ef32d8 a3=1 items=0 ppid=3343 pid=3344 auid=4294967295 uid=0 gid=12 euid=0 suid=0 fsuid=0 egid=12 sgid=12 fsgid=12 tty=(none) ses=4294967295 comm="procmail" exe="/usr/bin/procmail" subj=system_u:system_r:procmail_t:s0 key=(null)

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