[CentOS] Defaults of CentOS Install not working with SELinux

Andrew Colin Kissa andrew at topdog.za.net
Thu Apr 30 15:43:42 UTC 2009


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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