cf/sh/check-permissions.sh

#!/bin/sh --
#
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#

# 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 (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
#

PATH=/bin

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

analyze() {
    case "`ls -Lldn $1`" in
        ?????w??w?*)
            echo $2: $1 is group and world writable
            bogus_dirs=true ;;
        ????????w?*)
            echo $2: $1 is world writable
            bogus_dirs=true ;;
        ?????w????*)
            echo $2: $1 is group writable
            bogus_dirs=true ;;
    esac
}

# 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

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
            }
        }'` "/"
    do
        analyze $j $1
    done
}

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

afl1=`grep "^OA" $config | sed 's/^OA//' | sed 's/,/ /g' | sed 's/.*://'`
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 $afl2 | \
    grep :include: | \
    sed 's/.*:include://' | \
    sed 's/,.*$//'`
do
    break_down $i
done

# 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 [ $# -eq 0 ] ; then
    arg="$(id -u -n -r)"
elif [ $1 = "ALL" ] ; then
    arg=""
else
    arg="$*"
fi

for i in `getent passwd $arg | nawk -F: '{print $6}'`
do
    if [ -f $i/.forward ] ; then
        break_down $i/.forward
    fi
done

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