script.sh

#!/bin/bash

# Récupération de l'adresse IP WAN
WANIP=$(dig +short myip.opendns.com @resolver1.opendns.com)

if [ "$IP" = "" ]; then
    WANIP=$(wget -qO- ipv4.icanhazip.com)
fi

read -p "> Veuillez saisir le nom d'hôte : " HOSTNAME
read -p "> Veuillez saisir le nom de domaine : " DOMAIN

FQDN="${HOSTNAME}.${DOMAIN}"

# Modification du nom d'hôte
echo $HOSTNAME > /etc/hostname

# Modification du FQDN
cat > /etc/hosts <<EOF
127.0.0.1 localhost.localdomain localhost
${WANIP} ${FQDN}               ${HOSTNAME}

::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
EOF

mysqladmin -uroot create postfix

PFPASSWD=$(strings /dev/urandom | grep -o '[1-9A-NP-Za-np-z]' | head -n 10 | tr -d '\n')
SQLQUERY="CREATE USER 'postfix'@'localhost' IDENTIFIED BY '${PFPASSWD}'; \
          GRANT USAGE ON *.* TO 'postfix'@'localhost'; \
          GRANT ALL PRIVILEGES ON postfix.* TO 'postfix'@'localhost';"

mysql -uroot "postfix" -e "$SQLQUERY" &> /dev/null

sed -i -e "s|\(myhostname.*=\).*|\1 '${FQDN}';|" \
       -e "s|\(myorigin.*=\).*|\1 '${FQDN}';|" \
       -e "s|\(error_notice_recipient.*=\).*|\1 'admin${DOMAIN}';|" /etc/postfix/main.cf


sed -i -e "s|\(password.*=\).*|\1 '${PFPASSWD}';|" /etc/postfix/mysql-virtual-mailbox-domains.cf
sed -i -e "s|\(password.*=\).*|\1 '${PFPASSWD}';|" /etc/postfix/mysql-virtual-mailbox-maps.cf
sed -i -e "s|\(password.*=\).*|\1 '${PFPASSWD}';|" /etc/postfix/mysql-virtual-alias-maps.cf

mkdir -p /var/mail/vhosts/${DOMAIN}

sed -i -e "s|\(connect.*=\).*|\1 'host=127.0.0.1 dbname=postfix user=postfix password=${PFPASSWD}';|" /etc/dovecot/dovecot-sql.conf.ext

cat > /etc/opendkim/TrustedHosts <<EOF
127.0.0.1
localhost
192.168.0.1/24

*.${DOMAIN}
EOF

cat > /etc/opendkim/KeyTable <<EOF
mail._domainkey.${DOMAIN} ${DOMAIN}:mail:/etc/opendkim/keys/${DOMAIN}/mail.private
EOF

cat > /etc/opendkim/SigningTable <<EOF
*@${DOMAIN} mail._domainkey.${DOMAIN}
EOF

cd /etc/opendkim/keys

mkdir $DOMAIN && cd $DOMAIN
opendkim-genkey -s mail -d $DOMAIN -b 4096

chown opendkim:opendkim mail.private
chmod 400 mail.private mail.txt