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Re: procmail

Paul Howarth wrote:
Christopher J. PeBenito wrote:
On Fri, 2006-04-21 at 11:02 +0100, Paul Howarth wrote:
Paul Howarth wrote:

module procmail 0.1;

require {
         class dir { add_name getattr read remove_name search write };
class file { append create execute execute_no_trans getattr ioctl lock read rename unlink write };
         class lnk_file read;
class process { noatsecure sigchld siginh transition rlimitinh };
         class fd { use };
         class fifo_file { getattr read write append ioctl lock };
This does seem to work but surely there's a tidier way of handling those class requirements? What am I missing?

You want to use the "policy_module(procmail,0.1)" macro instead of the
module statement at the top.  It adds all of the kernel object classes,
so you don't have to write them all out.

Thanks, that's much better:

policy_module(procmail, 0.2)

require {
    type procmail_t;
    type sbin_t;
    type var_log_t;

# Needed for writing to /var/log/procmail.log
allow procmail_t var_log_t:dir search;
allow procmail_t var_log_t:file append;

# ==============================================
# Procmail needs to call sendmail for forwarding
# ==============================================
# This should be in selinux-policy-2.2.34-2 onwards

# Read alternatives link
allow procmail_t sbin_t:lnk_file read;

# Allow transition to sendmail
# (may need similar code for other MTAs that can replace sendmail)

selinux-policy-2.2.34-2 has the domain transition allowing procmail to run sendmail, but:

1. it still doesn't allow the sbin_t:lnk_file read to follow the "alternatives" link /usr/sbin/sendmail -> /etc/alternatives/mta

2. there will need to be a transition enabled for other MTAs that can replace sendmail, such as postfix, exim, etc. if their sendmail-compatible command-line program is not labelled sendmail_exec_t.


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