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#!/bin/sh -e
#-----------------------------------------------------------------------------
#
# $Sendmail: update_tls,v 8.17.1.9 2024-06-16 21:07:57 cowboy Exp $
#
# Sendmail support for TLS
#
# Copyright (c) 2000-2010 Richard Nelson.  All Rights Reserved.
#
# Notes:
#
#-----------------------------------------------------------------------------
set -e;

#------------------------------------------------------------------------------
# Local variables
#---------------------------------------------------------------------------
HOSTNAME=`hostname -s`;
DOMAINNAME=`hostname -d`;
MAILNAME=`cat /etc/mailname 2> /dev/null || hostname -f`;
SSL_FQDN=`hostname -f`;
SSL_EMAIL="admin@${MAILNAME}";
export SSL_FQDN SSL_EMAIL;
PROGRAM='sendmail';
CERT_DIR="/etc/ssl/certs";
COM_PRM="/etc/mail/tls/$PROGRAM-common.prm";
COM_KEY="/etc/mail/tls/$PROGRAM-common.key";
MTA_CFG="/etc/mail/tls/$PROGRAM-server.cfg";
MTA_CSR="/etc/mail/tls/$PROGRAM-server.csr";
MTA_CRT="/etc/mail/tls/$PROGRAM-server.crt";
MSP_CFG="/etc/mail/tls/$PROGRAM-client.cfg";
MSP_CSR="/etc/mail/tls/$PROGRAM-client.csr";
MSP_CRT="/etc/mail/tls/$PROGRAM-client.crt";
NEW=0;
REFD=0;

# Path to other sendmail helpers
if [ -x ./update_sendmail ]; then
	sm_path='.';
elif [ -x $(dirname $0)/update_sendmail ]; then
	sm_path=$(dirname $0);
else
	sm_path=/usr/share/sendmail;
	fi;
# Bring in sendmail.conf for the network definitions
if [ ! -f /etc/mail/sendmail.conf ]; then
	if [ -x $sm_path/update_conf ]; then
		$sm_path/update_conf;
		fi;
	fi;
if [ -f /etc/mail/sendmail.conf ]; then
	. /etc/mail/sendmail.conf;
	fi;
if [ "$HANDS_OFF" != 'No' ]; then
	exit 0;
	fi;

#---------------------------------------------------------------------------
# create_config: Function to create openssl configuration file
#---------------------------------------------------------------------------
create_config () {
cat >$MTA_CFG <<EOT
[ ca ]
default_days	= 3650
x509_extensions = X509v3
[ req ]
default_bits					= 2048
distinguished_name				= req_DN
[ req_DN ]
countryName						= "1. Country Name			   (2 letter code)"
countryName_min					= 2
countryName_max					= 2
countryName_default				=
stateOrProvinceName				= "2. State or Province Name   (full name)	  "
stateOrProvinceName_default		=
localityName					= "3. Locality Name			   (eg, city)	  "
localityName_default			=
0.organizationName				= "4. Organization Name		   (eg, company)  "
0.organizationName_default		= Sendmail
organizationalUnitName			= "5. Organizational Unit Name (eg, section)  "
organizationalUnitName_default	= Sendmail Server
commonName						= "6. Common Name			   (MUST==FQDN)   "
commonName_max					= 64
commonName_default				= \$ENV::SSL_FQDN
emailAddress					= "7. Email Address			   (eg, name@FQDN)"
emailAddress_max				= 40
emailAddress_default			= \$ENV::SSL_EMAIL
[ x509v3 ]
subjectAltName	 = email:copy
issuerAltName	 = issuer:copy
basicConstraints = CA:false
nsComment		 = "Sendmail generated custom certificate"
nsCertType		 = server
nsSslServerName  = \$ENV::SSL_FQDN
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer:always
EOT
};


#---------------------------------------------------------------------------
# Check if OpenSSL is installed
if [ ! -d "$CERT_DIR" ]; then
	cat <<-EOT

	OpenSSL is not installed, will not configure sendmail support for it.

	to install openssl, get openssl.

	To enable sendmail TLS support at a later date, invoke "$0"

	EOT
	exit 0;
	fi;

echo ' ';
echo 'Creating/Updating SSL(for TLS) information';


#---------------------------------------------------------------------------
# Process arguments
#---------------------------------------------------------------------------
case "$1" in
	[Nn][Ee][Ww]* | \
	[Rr][Ee][Nn][Ee][Ww]* | \
	[Rr][Ee][Ss][Ii][Gg][Nn]*)
		echo 'Removing any pre-existing sendmail certificates.';
		if [ -x /usr/bin/openssl ]; then
			if [ -f $MTA_CRT ]; then
				LINK="$CERT_DIR/"$(openssl x509 -noout -hash < $MTA_CRT)".0";
				rm -f $LINK 2>/dev/null;
				fi;
			if [ -f $MSP_CRT ]; then
				LINK="$CERT_DIR/"$(openssl x509 -noout -hash < $MSP_CRT)".0";
				rm -f $LINK 2>/dev/null;
				fi;
			fi;
		rm -f $MTA_CSR $MTA_CRT 2>/dev/null;
		rm -f $MSP_CSR $MSP_CRT 2>/dev/null;
		rm -f $COM_PRM $COM_KEY 2>/dev/null;
		;;
	esac

#---------------------------------------------------------------------------
# Make sure sendmail.mc points to proper /etc/mail/tls/starttls.m4
if [ -f /etc/mail/sendmail.mc ]; then
	if (grep -qEe "^[[:space:]]*include\(\`?/etc/mail/starttls.m4" \
		/etc/mail/sendmail.mc); then
		sed -e "s=^\([[:space:]]*\)\(\`\?\)include(\`\?/etc/mail/starttls.m4'\?)\(dnl\)\?=\1\2include(\`/etc/mail/tls/starttls.m4')dnl=g" \
			 /etc/mail/sendmail.mc > /etc/mail/sendmail.mc.new;
		chown root:smmsp /etc/mail/sendmail.mc.new;
		chmod 0644 /etc/mail/sendmail.mc.new;
		mv /etc/mail/sendmail.mc.new /etc/mail/sendmail.mc;
		fi;
	fi;
if [ -f /etc/mail/submit.mc ]; then
	if (grep -qEe "^[[:space:]]*include\(\`?/etc/mail/starttls.m4" \
		/etc/mail/submit.mc); then
		sed -e "s=^\([[:space:]]*\)\(\`\?\)include(\`\?/etc/mail/starttls.m4'\?)\(dnl\)\?=\1\2include(\`/etc/mail/tls/starttls.m4')dnl=g" \
			 /etc/mail/submit.mc > /etc/mail/submit.mc.new;
		chown root:smmsp /etc/mail/submit.mc.new;
		chmod 0644 /etc/mail/submit.mc.new;
		mv /etc/mail/submit.mc.new /etc/mail/submit.mc;
		fi;
	fi;

#---------------------------------------------------------------------------
# check for references to starttls.m4 in sendmail.mc
if [ -f /etc/mail/sendmail.mc ]; then
	if grep -qEe "^[[:space:]]*include\(\`?/etc/mail/tls/starttls.m4" \
		/etc/mail/sendmail.mc; then
		REFD=1;
		fi;
	fi;

#---------------------------------------------------------------------------
# Make sure prototype /etc/mail/tls/starttls.m4 exists
mkdir -p /etc/mail/tls 2>/dev/null;
chown smmta:smmsp /etc/mail/tls;
chmod 0755 /etc/mail/tls;
$sm_path/update_tlsm4 || true;

#---------------------------------------------------------------------------
# check for SSL
if [ -d "$CERT_DIR" ]; then
	if [ -f $MTA_CRT ] && [ -f $MSP_CRT ]; then
		echo 'You already have sendmail certificates';
		echo ' ';
		chown root:smmsp $COM_PRM;
		chown root:smmsp $COM_KEY;
		chown root:smmsp $MTA_CRT;
		chown root:smmsp $MSP_CRT;
	else
		if [ -x /usr/bin/openssl ]; then
			yn="Y";
		else
			cat <<-EOT
			$PROGRAM needs openssl (not installed) to create a
			certificate to validate users

			If you don't need a certificate, say No
			If you want a certificate, install openssl and say Yes

			Do you wish to create a certificate?
			EOT
			read yn;
			yn=$(echo -n "$yn" | sed -e "s/^\ *//" -e "s/^\t*//");
			test -n "$yn" || yn="N";
			fi;

		# Create new (self-signed) certificate
		case "$yn" in
		   [Yy]*)
			echo "Creating SSL certificates for sendmail.";
			# Create prompt file
			if [ ! -f /etc/mail/tls/no_prompt ]; then
				cat >/etc/mail/tls/no_prompt <<-EOT







				EOT
				fi;

			# Create config files
			if [ ! -f $MTA_CFG ]; then
				create_config;
				chmod 0600 $MTA_CFG;
				fi;
			if [ ! -f $MSP_CFG ]; then
				sed -e "s/Sendmail Server/Sendmail Client/" \
					$MTA_CFG > $MSP_CFG;
				chmod 0600 $MSP_CFG;
				fi;
			# Create shared DSA/DH password parameters
			if [ ! -s $COM_PRM ]; then
				openssl dsaparam -out $COM_PRM 2048
				openssl dhparam -dsaparam -in $COM_PRM >> $COM_PRM;
				chown root:smmsp $COM_PRM;
				chmod 0640 $COM_PRM;
				fi;
			# Create shared DSA/RSA key (RSA preferred for browser support)
			if [ ! -f $COM_KEY ]; then
				openssl genrsa -out $COM_KEY 2048;
				#openssl gendsa -out $COM_KEY $COM_PRM;
				chown root:smmsp $COM_KEY;
				chmod 0640 $COM_KEY;
				fi;
			# sendmail requires that CN=fqdn
			# Prompts:	1) Country Name (2 letter code)
			#			2) State or Province Name
			#			3) Locality Name (eg, city)
			#			4) Organization Name (eg, company)
			#			5) Organizational Unit Name (eg, section)
			#			6) Common Name (eg, YOUR name)
			#			7) Email Address
			if [ ! -f $MTA_CRT ]; then
				openssl req -new -config $MTA_CFG -key $COM_KEY \
					-out $MTA_CSR \
					</etc/mail/tls/no_prompt >/dev/null 2>&1;
				chmod 0600 $MTA_CSR;
				openssl x509 -req -extfile $MTA_CFG \
					-signkey $COM_KEY -in $MTA_CSR \
					-out $MTA_CRT -days 3650 \
					>/dev/null 2>&1;
				chown root:smmsp $MTA_CRT;
				chmod 0644 $MTA_CRT;
				fi;
			if [ ! -f $MSP_CRT ]; then
				openssl req -new -config $MSP_CFG -key $COM_KEY \
					-out $MSP_CSR \
					</etc/mail/tls/no_prompt >/dev/null 2>&1;
				chmod 0600 $MSP_CSR;
				openssl x509 -req -extfile $MSP_CFG \
					-signkey $COM_KEY -in $MSP_CSR \
					-out $MSP_CRT -days 3650 \
					>/dev/null 2>&1;
				chown root:smmsp $MSP_CRT;
				chmod 0644 $MSP_CRT;
				fi;
		   esac;
		fi;

	# Create hash link for new certificate (must do msp last!)
	if [ -f $MTA_CRT ]; then
		LINK="$CERT_DIR/"$(openssl x509 -noout -hash < $MTA_CRT)".0";
		if [ ! -f $LINK ]; then
			ln -sf $MTA_CRT $LINK;
			fi;
		fi;
	if [ -f $MSP_CRT ]; then
		LINK="$CERT_DIR/"$(openssl x509 -noout -hash < $MSP_CRT)".0";
		if [ ! -f $LINK ]; then
			ln -sf $MSP_CRT $LINK;
			fi;
		fi;
	fi;

if [ $REFD -eq 0 ]; then
	cat <<-EOT

	*** *** *** WARNING *** WARNING *** WARNING *** WARNING *** *** ***

	Everything you need to support STARTTLS (encrypted mail transmission
	and user authentication via certificates) is installed and configured
	but is *NOT* being used.

	To enable sendmail to use STARTTLS, you need to:
		1) Add this line to /etc/mail/sendmail.mc and optionally
		   to /etc/mail/submit.mc:
			  include(\`/etc/mail/tls/starttls.m4')dnl
		2) Run sendmailconfig
		3) Restart sendmail

	EOT
	fi;