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|
#! /bin/sh -e
# This kludge of a shell script warps a sendmail.cf produced from a .mc file
# to report some spam to the Distributed Checksum Clearinghouse (DCC)
# in addition to rejecting it.
#
# Mail that is rejected by a sendmail access_db is reported via dccm to
# a DCC server as extremely bulky.
# Note that the error messages in the access_db file must start with "DCC:"
# or they will be ignored by this mechanism.
#
# This script should be run in the sendmail cf/cf directory, and given a list
# of .mc files, as in
# cd cf/cf
# .../misc/hackmc -AROT ../m4/cf.m4 local.mc > local.cf
# It seems to work on sendmail.cf generated for sendmail versions 8.11
# through 8.12.11. There is no guarantee that it will work with other
# versions. You must compare the result of this script with the unmodified
# sendmail.cf.
# This script "denatures" RCS keywords in its output so that revisions of
# the resulting sendmail.cf can be archived with RCS without losing
# the original RCS lines from the Sendmail organization.
# In addition to sending mail blacklisted by the sendmail access_db to
# the DCC, the following can also be turned on:
# -A send mail with bogus Mail_From domain names to the DCC instead of
# only rejecting it. This risks reporting legitimate mail from systems
# with temporarily broken DNS values as spam, and then later rejecting
# it when the DNS values are fixed and it is retransmitted.
# -R silently discard unauthorized relay attempts after reporting them
# to the DCC. This mechanism also implies -f to ensure that relayed
# attempts do not leak if dccm is not running.
# -r reject unauthorized relay attempts after reporting them
# to the DCC. This mechanism also implies -f to ensure that relayed
# attempts do not leak if dccm is not running.
# -D add a local rule that rejects mail from SMTP clients
# without reverse DNS and reports the mail as spam to the DCC.
# Note that this has a fairly high false positive rate.
# -O modify the sendmail rules to treat access_db "OK" and "RELAY"
# or "Spam:...FRIEND" entries as whitelisting the message.
# -M modify the sendmail rules generated by FEATURE(dnsbl) or
# Feature(enhdnsbl) so that mail that is rejected by DNS blacklists is
# reported via dccm to a DCC server as extremely bulky.
# -T modify the sendmail rules to trust (whitelist) mail from users
# authenticated with an SMTP AUTH TRUST_AUTH_MECH() mechanism or from
# SMTP clients with certificates verified with START TLS.
# If STMP-AUTH used, TRUST_AUTH_MECH must be set in the .mc file and
# sendmail must be built with SASL or otherwise have working SMTP auth.
# -f if dccm fails, reject mail with a temporary failure status code
# instead of passing it. This changes the default FEATURE(dcc)
# parameters; see dcc.m4.
# -m m4
# specifies the path to the m4 program as well as any m4 args
# such as `hackmc -m4 "/usr/bin/m4 -D_CF_DIR_=/usr/share/sendmail/cf/"`
# Copyright (c) 2004 by Rhyolite Software
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND RHYOLITE SOFTWARE DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RHYOLITE SOFTWARE
# BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.
# Rhyolite Software DCC 1.2.74-1.33 $Revision$
USAGE="`basename $0`: [-xfARrDOMT] [-m m4] file1.mc file2.mc ..."
M4=m4
DNS1='#'
DNS2='#'
RELAY='#'
NOTSPAM=
AUTH=
# fail temporarily if dccm is not running.
# Add F=T to reject mail when dccm is dead,
# but only if there is not already an F=x setting in the FEATURE() macro.
TEMPFAIL='#'
TEMPFAIL0='/F=/!s/S=[^ ,]*/&, F=T/'
RDNS=
DNSBL=
# remove extra quotes
CLEANUP='#'
CLEANUP0='/TODCC/s/""//'
while getopts "xm:fARrDOMT" c; do
case $c in
x) set -x;;
m) M4="$OPTARG";;
f) TEMPFAIL=$TEMPFAIL0;;
A)
DNS1='s/$#error $@ \([.0-9]*\) $: "\(5.*[Dd]omain name required.*\)/$# $(macro {dcc_isspam} $@ "\1 \2" Sent to DCC" $) TODCC/'
DNS2='s/$#error $@ \([.0-9]*\) $: "\(5.*Domain of sender.*\)/$# $(macro {dcc_isspam} $@ "\1 \2" Sent to DCC" $) TODCC/'
CLEANUP=$CLEANUP0
;;
R)
RELAY='s/$#error $@ [.0-9]* $: "5[.0-9 ]*\(Relaying denied.*\)/$# $(macro {dcc_isspam} $@ "DISCARD: \1" Sent to DCC" $) TODCC/'
TEMPFAIL=$TEMPFAIL0
CLEANUP=$CLEANUP0
;;
r)
RELAY='s/$#error $@ [.0-9]* $: "5[.0-9 ]*\(Relaying denied.*\)/$# $(macro {dcc_isspam} $@ "REJECT: \1" Sent to DCC" $) TODCC/'
TEMPFAIL=$TEMPFAIL0
CLEANUP=$CLEANUP0
;;
D) RDNS=yes
;;
M) DNSBL='/^# DNS based IP address spam list/,/^$/s/$#error $@ \(5[.0-9]*\) $: "\(.*\)/$@ $(macro {dcc_isspam} $@ "\1 \2" Sent to DCC" $) TODCC/'
;;
T) AUTH=yes
;;
O) NOTSPAM='s/^R<\$={Accept}> *<*\$\*>* *[^ ]*/& $(macro {dcc_notspam} $@ $1 $)/'
;;
*) echo 1>&2 "$USAGE"; exit 1;;
esac
done
shift `expr $OPTIND - 1 || true`
# deal with -D and -T
(
if test "$RDNS" = yes -o "$AUTH" = yes; then
echo LOCAL_RULESETS
fi
if test "$RDNS" = yes; then
cat <<'EOF'
SLocal_check_relay
R$* $: <$&{client_resolve}> $1
R<FAIL> $* $# $(macro {dcc_isspam} $@ "SMTP client "$&{client_addr}" has no reverse DNS name" $) TODCC
R<$*> $* $: $2
EOF
fi
# deal with -T
if test "$AUTH" = yes; then
cat <<'EOF'
SLocal_check_mail
# mail from an SMTP client with a verified TLS cert is not spam for dccm
R$* $: <$&{verify}> $1
R<OK> $* $: $(macro {dcc_notspam} $@ STARTTLS verified $) <> $1
R<$*> $* $: <$&{auth_type}> $2
# mail authenticated with SMTP AUTH for relaying is also not spam for dccm
R<$={TrustAuthMech}> $* $: $(macro {dcc_notspam} $@ authenticated $) <> $2
R<$*> $* $: $2
EOF
fi
) | $M4 $* - \
| sed -e 's/\$\(Id:.*\)\$/\1/' -e 's/\$\(Revision:.*\)\$/\1/' \
-e "$DNS1" -e "$DNS2" -e "$RELAY" -e "$NOTSPAM" -e "$DNSBL" \
-e '/^Xdcc/{' -e "$TEMPFAIL" -e '}' \
-e '# always add the access.db hook' \
-e '/^R<$={Accept}>/a\
R<DCC:$*> $* $# $(macro {dcc_isspam} $@ $1": Sent to DCC" $) TODCC' \
-e "$CLEANUP"
|
