#
# this is a filter to make sendmail reject messages with Date: headers
# that are too long. This is used in the latest Outlook exploit.
#
# You NEED:
# - a sendmail that understands regex maps. I had to specially compile this
#   into 8.11 ! Add to sendmail-8.11.0/devtools/Site/site.config.m4
#   APPENDDEF(`confMAPDEF',`-DMAP_REGEX') and rebuild from scratch
#
# Sendmail 8.9 also works, but doesn't understand the + syntax for calling
# the ruleset with full header (instead of header with just comments).
#
# The filter simply rejects messages with a date header longer (total!)
# then 60 chars
#
# Then add this part to your .mc file in the different areas and regenerate
# your .cf file
#
# 2000-07-21 Originally written
# 2000-07-24 Fixed cut-and-paste error
# 2000-07-25 Added comment about sendmail 8.9
#
# if you cut and paste this:
# tabs are in use in the '^R' lines
#
# Koos van den Hout
# http://www.cetis.hvu.nl/~koos/
# http://www.virtualbookcase.com/
#

LOCAL_CONFIG
Klinetoolong regex -a@MATCH ^.{60,}$

LOCAL_RULESETS
HDate: $>+CheckDate

SCheckDate
R$*				$: $(linetoolong $1 $)
R@MATCH			$#error $: 553 Date Header too long error
R$*				$@ OK