Description of problem:
When the MTA is the default postfix, mail to local user causes an selinux violation when postfix attempts to write its lockfile


Version-Release number of selected component (if applicable):
selinux-policy-targeted-3.9.7-29.fc14.noarch

How reproducible:
every time

Steps to Reproduce:
1. $ mailx -s test <local user>
   test message
   .
   $
2. note selinux denial within 1 second
  
Actual results:
selinux denial

Expected results:
normal email delivery

Additional info:

SELinux is preventing /usr/libexec/postfix/local from write access on the file john.lock.

*****  Plugin catchall_boolean (89.3 confidence) suggests  *******************

If you want to allow postfix_local domain full write access to mail_spool directories
Then you must tell SELinux about this by enabling the 'allow_postfix_local_write_mail_spool' boolean.
Do
setsebool -P allow_postfix_local_write_mail_spool 1

*****  Plugin catchall (11.6 confidence) suggests  ***************************

If you believe that local should be allowed write access on the john.lock 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 local /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:system_r:postfix_local_t:s0
Target Context                unconfined_u:object_r:mail_spool_t:s0
Target Objects                john.lock [ file ]
Source                        local
Source Path                   /usr/libexec/postfix/local
Port                          <Unknown>
Host                          john.mellor.dyndns.org
Source RPM Packages           postfix-2.7.1-1.fc14
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.7-29.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     john.mellor.dyndns.org
Platform                      Linux john.mellor.dyndns.org
                              2.6.35.11-83.fc14.x86_64 #1 SMP Mon Feb 7 07:06:44
                              UTC 2011 x86_64 x86_64
Alert Count                   1
First Seen                    Sat 12 Feb 2011 09:51:11 AM EST
Last Seen                     Sat 12 Feb 2011 09:51:11 AM EST
Local ID                      e7798024-13df-412a-8e48-1c88b2e19f09

Raw Audit Messages
type=AVC msg=audit(1297522271.519:97): avc:  denied  { write } for  pid=7066 comm="local" name="john.lock" dev=dm-0 ino=1313543 scontext=unconfined_u:system_r:postfix_local_t:s0 tcontext=unconfined_u:object_r:mail_spool_t:s0 tclass=file


type=SYSCALL msg=audit(1297522271.519:97): arch=x86_64 syscall=open success=no exit=EACCES a0=7f4eb8b6bf50 a1=c1 a2=0 a3=1 items=0 ppid=5403 pid=7066 auid=500 uid=0 gid=0 euid=500 suid=0 fsuid=500 egid=12 sgid=0 fsgid=12 tty=(none) ses=1 comm=local exe=/usr/libexec/postfix/local subj=unconfined_u:system_r:postfix_local_t:s0 key=(null)

Hash: local,postfix_local_t,mail_spool_t,file,write

audit2allow

#============= postfix_local_t ==============
#!!!! This avc can be allowed using the boolean 'allow_postfix_local_write_mail_spool'

allow postfix_local_t mail_spool_t:file write;

audit2allow -R

#============= postfix_local_t ==============
#!!!! This avc can be allowed using the boolean 'allow_postfix_local_write_mail_spool'

allow postfix_local_t mail_spool_t:file write;