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Re: postfix with maildir delivery



freeslkr <freeslkr.wl6x <at> mailnull.com> writes:

> Hello,
> 
> I'm trying out SELinux on Fedora 8 in permissive mode. I get AVCs
> everytime postfix delivers mail to the maildir directories. It looks
> like postfix doesn't have permission to create files. For example,
> 
> from /var/log/messages:
> 
> 	SELinux is preventing local (postfix_local_t) "link" to
> 	./1208923427.P3686.myhost (mail_spool_t)
> 
> from /var/log/audit/audit.log:
> 
> 	type=AVC msg=audit(1208923427.350:95): avc: denied { link } for
> 	pid=3686 comm="local" name="1208923427.P3686.myhost" dev=dm-3
> 	ino=819271 scontext=system_u:system_r:postfix_local_t:s0
> 	tcontext=system_u:object_r:mail_spool_t:s0 tclass=file
> 
> 	type=SYSCALL msg=audit(1208923427.350:95): arch=c000003e
> 	syscall=86 success=yes exit=0 a0=2aaaaad599c0 a1=2aaaaad59ba0
> 	a2=0 a3=0 items=0 ppid=2371 pid=3686 auid=4294967295 uid=0 gid=0
> 	euid=1000 suid=0 fsuid=1000 egid=1000 sgid=0 fsgid=1000 tty=(none)
> 	comm="local" exe="/usr/libexec/postfix/local"
> 	subj=system_u:system_r:postfix_local_t:s0 key=(null)
> 
> Is my interpretation correct. If so, is it likely that this could be
> corrected in a future policy version?
> 
> Thank you for you help

I'll first note that reverting to mbox files in /var/spool/mail works
just fine.

Blundering along here ...

file:///usr/share/doc/selinux-policy-3.0.8/html/services_postfix.html
says

  allow_postfix_local_write_mail_spool
  Default value: false
  Description: Allow postfix_local domain full write access to mail_spool
    directories

This sounds like what I need. But, it seems that it's already set.

  $ getsebool allow_postfix_local_write_mail_spool
  allow_postfix_local_write_mail_spool --> on

  $ cd /var/spool
  $ ls -Zd mail
  drwxrwxr-x  root mail system_u:object_r:mail_spool_t:s0 mail

  $ ls -Zd mail/*
  drwxrwx---  XXXX mail system_u:object_r:mail_spool_t:s0 mail/XXXX

  $ ls -Zd mail/*/*
  drwxrwx---  XXXX mail system_u:object_r:mail_spool_t:s0 mail/XXXX/cur
  drwxrwx---  XXXX mail system_u:object_r:mail_spool_t:s0 mail/XXXX/new
  drwxrwx---  XXXX mail system_u:object_r:mail_spool_t:s0 mail/XXXX/tmp

  $ ls -Z mail/*/*/new
  -rw-------  XXXX XXXX system_u:object_r:mail_spool_t:s0
    1209227463.Vfd03Ic8046M24695.myhost

To me, it _looks_ postfix should be able to create new files in
/var/spool/mail/*/*, but this is being denied.

In the selinux-policy source rpm, there are three files that seem to be 
related to postfix: postfix.{fc,if,te}. Obviously, I don't understand how
all of this works, but there are no direct references to mail_spool_t or
/var/spool/mail or /var/mail in these files.

/var/spool/postfix has type postfix_spool_t, so naively I try

  $ chcon --recursive --type postfix_spool_t /var/spool/mail

but that causes numerous AVC denied messages.

Using audit2allow:

  $ grep -e postfix -e mail /var/log/audit/audit.log | audit2allow
  #============= postfix_local_t ==============
  allow postfix_local_t mail_spool_t:file link;

Now, if I can just figure out what to do with this .... Thanks to anyone
that shares some insight here.


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