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Re: Procmail battles



Gregory P. Ennis wrote:
On Sun, 2006-05-14 at 12:52 +0100, Paul Howarth wrote:
On Sat, 2006-05-13 at 20:52 -0500, Gregory P. Ennis wrote:
On Sat, 2006-05-13 at 21:42 -0400, Paul Michael Reilly wrote:
Les Mikesell <lesmikesell gmail com> writes:

 > On Sat, 2006-05-13 at 14:48, Paul Michael Reilly wrote:
> > > LOGFILE=/root/procmail.log
 > > LOGABSTRACT=yes
 > > VERBOSE=1
> > > > and send mail to "root" then I actually see an abstract appended to
 > > /root/procmail.log which is consistent with the procmail man page in
 > > that it says $HOME/.procmailrc will get processed.  I leaped,
 > > incorrectly it would appear, to the conclusion that $HOME referred to
 > > the mail target.  It must be referring to the User running procmail,
 > > i.e. "root" on a stock Fedora Core system, which makes considerable
 > > sense.  This, I believe, is the crux of my battles.
> > $HOME is the expansion of the environment variable HOME, which
 > is set to the 6th field of the user's /etc/passwd file entry,
 > i.e. their home directory.  This happens in a straightforward
> way during logins and is emulated in procmail runs. > > > So that raises the question: how does one configure mail (sendmail or
 > > otherwise) on a stock Fedora Core system so that ~User/.procmailrc
 > > will be processed for all User's on the system?
> > ~user is expanded in a shell to the same thing as $HOME would be for
 > that user.  Sendmail should, by default, use procmail for everyone
 > which should then process their .procmailrc but it will not trust
 > files where the permissions allow write access by others.

Excellent.  This insight has led to the real culprit: selinux.
Disabling selinux leads to FC4 level behavior so it is a safe bet that
a more stringent FC5 selinux setting is what is ailing me.  Now,
ideally, I should be able to google FC5, selinux and mail and get some
insight.  Not so.  Anyone have a reference where I can learn what
FC5 now expects from sendmail/procmail to make selinux happy?  The
entries in /var/log/messages are not exactly real informative:

May 13 21:22:04 roamer kernel: audit(1147569724.815:39): avc:  denied  { search } for  pid=26417 comm="procmail" name="log" dev=dm-0 ino=4128796 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=dir


-pmr

I am having the same problem with FC5 and selinux.  My system worked
fine with FC4 but is failing with FC5.  I am using procmail to store
spam in created directory ie /savedrwxr-xr-x  root     mail     root:object_r:root_t             .


/home/$USER/Mail/spam.  When I turn
selinux off I can get procmail to work perfectly, but when I turn
selinux back on it fails to be able to write in this directory.  I know
very little about selinux and would appreciate some references as to
changes from FC4 to FC5 as well.
The out-of-the-box selinux policy for FC5 was somewhat broken for
procmail, particularly if you wanted to forward mail as an action.

Paul, what log files are you trying to write, and what the the "adv:
denial" messages you see in /var/log/messages when procmail tries to
write to this log?

Gregory, is /save/home/$USER the home directory for $USER?
What's the output of:
$ ls -laZ /save/home

Paul.


Paul,

Thanks for your help.  Is there a way to modify the procmail policy in
selinux?

The above directory is not the home directory of the user.  When I
originally designed the software I created a directory system outside of
the /home, but $USER does represent the name of the user.  Here is a
partial listing of ls -laZ /save/home

drwxr-xr-x  root     root     root:object_r:root_t             ..
drwxr-xr-x  bkgrndch bkgrndch root:object_r:root_t             bkgrndchk
drwxr-xr-x  claire   claire   root:object_r:root_t             claire
drwxr-xr-x  clamav   clamav   root:object_r:root_t             clamav
drwxr-xr-x  greg     greg     root:object_r:root_t             greg
drwxr-xr-x  jesse    jesse    root:object_r:root_t             jesse
drwxr-xr-x  mail     mail     root:object_r:root_t             lost
+found
drwxr-xr-x  mailwoma mailwoma root:object_r:root_t             mailwoman
drwxr-xr-x  melissa  melissa  root:object_r:root_t             melissa

Thanks again for your help!

You can probably fix this with file context changes rather than policy changes. Try this:

# chcon -Rh -t user_home_t /save/home/*
# chcon -h -t user_home_dir_t /save/home/*

Paul.


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