155 lines
5.6 KiB
Bash
Executable File
155 lines
5.6 KiB
Bash
Executable File
# Configures a postfix SMTP server and dovecot IMAP server.
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#
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# We configure these together because postfix delivers mail
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# directly to dovecot, so they basically rely on each other.
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# Install packages.
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sudo DEBIAN_FRONTEND=noninteractive apt-get install -q -y \
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postfix postgrey dovecot-core dovecot-imapd dovecot-lmtpd dovecot-sqlite
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# POSTFIX
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mkdir -p $STORAGE_ROOT/mail
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# TLS configuration
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sudo sed -i "s/#submission/submission/" /etc/postfix/master.cf # enable submission port (not in Drew Crawford's instructions)
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sudo tools/editconf.py /etc/postfix/main.cf \
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smtpd_use_tls=yes\
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smtpd_tls_auth_only=yes \
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smtp_tls_security_level=may \
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smtp_tls_loglevel=2 \
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smtpd_tls_received_header=yes
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# note: smtpd_use_tls=yes appears to already be the default, but we can never be too sure
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# authorization via dovecot
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sudo tools/editconf.py /etc/postfix/main.cf \
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smtpd_sasl_type=dovecot \
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smtpd_sasl_path=private/auth \
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smtpd_sasl_auth_enable=yes \
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smtpd_recipient_restrictions=permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
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sudo tools/editconf.py /etc/postfix/main.cf mydestination=localhost
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# message delivery is directly to dovecot
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sudo tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:unix:private/dovecot-lmtp
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# domain and user table is configured in a Sqlite3 database
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sudo tools/editconf.py /etc/postfix/main.cf \
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virtual_mailbox_domains=sqlite:/etc/postfix/virtual-mailbox-domains.cf \
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virtual_mailbox_maps=sqlite:/etc/postfix/virtual-mailbox-maps.cf \
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virtual_alias_maps=sqlite:/etc/postfix/virtual-alias-maps.cf \
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local_recipient_maps=\$virtual_mailbox_maps
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db_path=$STORAGE_ROOT/mail/users.sqlite
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sudo su root -c "cat > /etc/postfix/virtual-mailbox-domains.cf" << EOF;
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dbpath=$db_path
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query = SELECT 1 FROM users WHERE email LIKE '%%@%s'
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EOF
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sudo su root -c "cat > /etc/postfix/virtual-mailbox-maps.cf" << EOF;
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dbpath=$db_path
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query = SELECT 1 FROM users WHERE email='%s'
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EOF
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sudo su root -c "cat > /etc/postfix/virtual-alias-maps.cf" << EOF;
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dbpath=$db_path
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query = SELECT destination FROM aliases WHERE source='%s'
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EOF
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# create an empty mail users database if it doesn't yet exist
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if [ ! -f $db_path ]; then
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echo Creating new user database: $db_path;
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echo "CREATE TABLE users (id INTEGER PRIMARY KEY AUTOINCREMENT, email TEXT NOT NULL UNIQUE, password TEXT NOT NULL, extra);" | sqlite3 $db_path;
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echo "CREATE TABLE aliases (id INTEGER PRIMARY KEY AUTOINCREMENT, source TEXT NOT NULL UNIQUE, destination TEXT NOT NULL);" | sqlite3 $db_path;
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fi
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# DOVECOT
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# The dovecot-imapd dovecot-lmtpd packages automatically enable those protocols.
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# mail storage location
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sudo tools/editconf.py /etc/dovecot/conf.d/10-mail.conf \
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mail_location=maildir:$STORAGE_ROOT/mail/mailboxes/%d/%n \
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mail_privileged_group=mail \
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first_valid_uid=0
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# authentication mechanisms
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sudo tools/editconf.py /etc/dovecot/conf.d/10-auth.conf \
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disable_plaintext_auth=yes \
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"auth_mechanisms=plain login"
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# use SQL-based authentication, not the system users
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sudo sed -i "s/\(\!include auth-system.conf.ext\)/#\1/" /etc/dovecot/conf.d/10-auth.conf
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sudo sed -i "s/#\(\!include auth-sql.conf.ext\)/\1/" /etc/dovecot/conf.d/10-auth.conf
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# how to access SQL
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sudo su root -c "cat > /etc/dovecot/conf.d/auth-sql.conf.ext" << EOF;
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passdb {
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driver = sql
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args = /etc/dovecot/dovecot-sql.conf.ext
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}
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userdb {
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driver = static
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args = uid=mail gid=mail home=$STORAGE_ROOT/mail/mailboxes/%d/%n
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}
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EOF
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sudo su root -c "cat > /etc/dovecot/dovecot-sql.conf.ext" << EOF;
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driver = sqlite
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connect = $db_path
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default_pass_scheme = SHA512-CRYPT
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password_query = SELECT email as user, password FROM users WHERE email='%u';
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EOF
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# disable in-the-clear IMAP and POP because we're paranoid (we haven't even
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# enabled POP).
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sudo sed -i "s/#port = 143/port = 0/" /etc/dovecot/conf.d/10-master.conf
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sudo sed -i "s/#port = 110/port = 0/" /etc/dovecot/conf.d/10-master.conf
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# Modify the unix socket for LMTP.
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sudo sed -i "s/unix_listener lmtp \(.*\)/unix_listener \/var\/spool\/postfix\/private\/dovecot-lmtp \1\n user = postfix\n group = postfix\n/" /etc/dovecot/conf.d/10-master.conf
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# Add an additional auth socket for postfix. Check if it already is
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# set to make sure this is idempotent.
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if sudo grep -q "mailinabox-postfix-private-auth" /etc/dovecot/conf.d/10-master.conf; then
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# already done
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true;
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else
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sudo sed -i "s/\(\s*unix_listener auth-userdb\)/ unix_listener \/var\/spool\/postfix\/private\/auth \{ # mailinabox-postfix-private-auth\n mode = 0666\n user = postfix\n group = postfix\n \}\n\1/" /etc/dovecot/conf.d/10-master.conf
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fi
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# Drew Crawford sets the auth-worker process to run as the mail user, but we don't care if it runs as root.
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# Enable SSL.
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sudo tools/editconf.py /etc/dovecot/conf.d/10-ssl.conf \
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ssl=required \
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"ssl_cert=<$STORAGE_ROOT/ssl/ssl_certificate.pem" \
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"ssl_key=<$STORAGE_ROOT/ssl/ssl_private_key.pem" \
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# The Dovecot installation already created a self-signed public/private key pair
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# in /etc/dovecot/dovecot.pem and /etc/dovecot/private/dovecot.pem, which we'll
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# use unless certificates already exist.
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mkdir -p $STORAGE_ROOT/ssl
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if [ ! -f $STORAGE_ROOT/ssl/ssl_certificate.pem ]; then sudo cp /etc/dovecot/dovecot.pem $STORAGE_ROOT/ssl/ssl_certificate.pem; fi
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if [ ! -f $STORAGE_ROOT/ssl/ssl_private_key.pem ]; then sudo cp /etc/dovecot/private/dovecot.pem $STORAGE_ROOT/ssl/ssl_private_key.pem; fi
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sudo chown -R mail:dovecot /etc/dovecot
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sudo chmod -R o-rwx /etc/dovecot
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mkdir -p $STORAGE_ROOT/mail/mailboxes
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sudo chown -R mail.mail $STORAGE_ROOT/mail/mailboxes
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# restart services
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sudo service postfix restart
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sudo service dovecot restart
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# allow mail-related ports in the firewall
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sudo ufw allow smtp
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sudo ufw allow submission
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sudo ufw allow imaps
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