#!/bin/sh --
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

# Check :include: aliases (in files configured in sendmail.cf) and .forward
# files to make sure the files and their parent directory paths all have
# proper permissions.  And check the master alias file(s) too.
#
# See http://www.sendmail.org/vendor/sun/migration.html#Security for details.
#
# Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# %W% (Sun) %G%
# ident	"%Z%%M%	%I%	%E% SMI"

setvar PATH = '/bin'

# Check the group- and world-writable bits on the given file.

proc analyze {
	match $(ls -Lldn $1) {
		with ?????w??w?* 
			echo $2: $1 is group and world writable
			setvar bogus_dirs = 'true' 
		with ????????w?* 
			echo $2: $1 is world writable
			setvar bogus_dirs = 'true' 
		with ?????w????* 
			echo $2: $1 is group writable
			setvar bogus_dirs = 'true' 
	}
}

# Break down the given file name into its components, and call analyze with
# each of them.  E.g., an argument of /usr/local/aliases/foo.list would call
# analyze in turn with arguments:
# * /usr/local/aliases/foo.list
# * /usr/local/aliases
# * /usr/local
# * /usr

proc break_down {
	for j in [$(echo $1 | \
		awk '{
			n = split($0, parts, "/");
			for (i = n; i >= 2; i--){
				string = "";
				for (j = 2; j <= i; j++){
					string = sprintf("%s/%s", string, parts[j]);
				}
				print string
			}
		}) "/]"
	{
		analyze $j $1
	}
}

setvar config = '/etc/mail/sendmail.cf'
setvar bogus_dirs = 'false'

setvar afl1 = $(grep "^OA" $config | sed 's/^OA//' | sed 's/,/ /g' | sed 's/.*://)
setvar afl2 = $(grep "^O AliasFile=" $config | sed 's/^O AliasFile=//' | \
    sed 's/,/ /g' | sed 's/.*://)

# These should be OK themselves, but other packages may have screwed up the
# permissions on /etc or /etc/mail .  And best to check in case non-standard
# alias paths are used.

break_down $afl1 $afl2

# Find all valid :include: files used in alias files configured in sendmail.cf

for i in [$(sed 's/^[#].*$//' $afl1 $afl2 | \
	grep :include: | \
	sed 's/.*:include://' | \
	sed 's/,.*$//)]
{
	break_down $i
}

# Check .forward files as well.  If the argument "ALL" is given, do it for
# everyone.  If no argument to the script is given, just do it for the current
# user.  O/w, do it for all arguments.

if test $Argc -eq 0  {
	setvar arg = $(id | nawk -F'(' '{n = split($2,id,")"); print id[1]})
} elif test $1 = "ALL"  {
	setvar arg = """"
} else {
	setvar arg = ""$ifsjoin(ARGV)""
}

for i in [$(getent passwd $arg | nawk -F: '{print $6})]
{
	if test -f $i/.forward  {
		break_down $i/.forward
	}
}

$bogus_dirs || echo "No unsafe directories found."