diff options
Diffstat (limited to 'terraform/modules/email/main.tf')
| -rw-r--r-- | terraform/modules/email/main.tf | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/terraform/modules/email/main.tf b/terraform/modules/email/main.tf new file mode 100644 index 0000000..510994e --- /dev/null +++ b/terraform/modules/email/main.tf @@ -0,0 +1,268 @@ +variable "secret_cloudflare_token" {} + +variable "domain" { + description = "Domain name of email addresses." +} + +variable "server_ipv4" { + description = "IP address of primary mail server." +} + +variable "server_ipv6" { + description = "IP address of primary mail server." +} + +variable "server_id" { + description = "Unique server ID that will trigger this module, if changed." +} + +resource "tls_private_key" "tls_mail" { + algorithm = "RSA" +} + +resource "acme_registration" "tls_mail" { + account_key_pem = "${tls_private_key.tls_mail.private_key_pem}" + email_address = "jakob@odersky.com" +} + +resource "acme_certificate" "tls_mail" { + account_key_pem = "${acme_registration.tls_mail.account_key_pem}" + common_name = "mail.${var.domain}" + + dns_challenge { + provider = "cloudflare" + + config { + CLOUDFLARE_EMAIL = "jakob@odersky.com" + CLOUDFLARE_API_KEY = "${var.secret_cloudflare_token}" + } + } +} + +resource "hcloud_rdns" "rdns4" { + server_id = "${var.server_id}" + ip_address = "${var.server_ipv4}" + dns_ptr = "mail.${var.domain}" +} + +resource "hcloud_rdns" "rdns6" { + server_id = "${var.server_id}" + ip_address = "${var.server_ipv6}" + dns_ptr = "mail.${var.domain}" +} + +resource "cloudflare_record" "record_a" { + type = "A" + domain = "${var.domain}" + name = "mail" + value = "${var.server_ipv4}" +} + +resource "cloudflare_record" "record_aaaa" { + type = "AAAA" + domain = "${var.domain}" + name = "mail" + value = "${var.server_ipv6}" +} + +resource "cloudflare_record" "record_mx" { + type = "MX" + domain = "${var.domain}" + name = "@" + value = "mail.${var.domain}" +} + +resource "cloudflare_record" "record_spf" { + type = "TXT" + domain = "${var.domain}" + name = "@" + value = "v=spf1 a mx -all" +} + +resource "cloudflare_record" "record_dmarc" { + type = "TXT" + domain = "${var.domain}" + name = "_dmarc" + value = "v=DMARC1; p=quarantine; rua=mailto:postmaster@${var.domain}" +} + +resource "tls_private_key" "dkim" { + algorithm = "RSA" +} + +resource "cloudflare_record" "record_dkim_txt" { + type = "TXT" + domain = "${var.domain}" + name = "mail._domainkey" + value = "v=DKIM1; k=rsa; p=${replace("${tls_private_key.dkim.public_key_pem}","/-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----|\n/","")};" +} + +resource "null_resource" "config" { + triggers { + server_id = "${var.server_id}" + domain = "${var.domain}" + dkim_private_key = "${tls_private_key.dkim.private_key_pem}" + mail_key = "${acme_certificate.tls_mail.private_key_pem}" + mail_cert = "${acme_certificate.tls_mail.certificate_pem}" + } + + connection { + host = "${var.server_ipv4}" + } + + provisioner "remote-exec" { + inline = ["DEBIAN_FRONTEND=noninteractive apt-get install --yes postfix opendkim bsd-mailx dovecot-core dovecot-imapd"] + } + + provisioner "file" { + content = "${acme_certificate.tls_mail.private_key_pem}" + destination = "/etc/ssl/private/mail.key.pem" + } + + provisioner "file" { + content = "${acme_certificate.tls_mail.certificate_pem}" + destination = "/etc/ssl/mail.cert.pem" + } + + provisioner "file" { + content = "${var.domain}\n" + destination = "/etc/mailname" + } + + provisioner "file" { + source = "${path.module}/postfix-master.cf" + destination = "/etc/postfix/master.cf" + } + + provisioner "file" { + content = <<EOF +myhostname = mail.${var.domain} +myorigin = /etc/mailname +mydestination = $myhostname, ${var.domain}, localhost.localdomain, localhost + +smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) +biff = no + +# appending .domain is the MUA's job. +append_dot_mydomain = no + +# Uncomment the next line to generate "delayed mail" warnings +#delay_warning_time = 4h + +readme_directory = no + +# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on +# fresh installs. +compatibility_level = 2 + +# TLS parameters +smtpd_tls_cert_file=/etc/ssl/mail.cert.pem +smtpd_tls_key_file=/etc/ssl/private/mail.key.pem +smtpd_use_tls=yes +smtpd_tls_session_cache_database = btree:$${data_directory}/smtpd_scache +smtp_tls_session_cache_database = btree:$${data_directory}/smtp_scache + +smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination +alias_maps = hash:/etc/aliases +alias_database = hash:/etc/aliases +relayhost = +mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 +mailbox_size_limit = 0 +recipient_delimiter = + +inet_interfaces = all +inet_protocols = all +#home_mailbox = mail/ + +smtpd_milters = inet:127.0.0.1:8891 +non_smtpd_milters = inet:127.0.0.1:8891 +EOF + + destination = "/etc/postfix/main.cf" + } + + provisioner "file" { + content = "${tls_private_key.dkim.private_key_pem}" + destination = "/etc/dkimkeys/dkim.key" + } + + provisioner "file" { + content = <<EOF +Syslog yes +UMask 007 +Domain ${var.domain} +KeyFile /etc/dkimkeys/dkim.key +# on Debian, directory permissions of /etc/dkimkeys already restrict access +RequireSafeKeys false +Selector mail +Canonicalization relaxed/simple +Mode s +Socket inet:8891@127.0.0.1 +PidFile /var/run/opendkim/opendkim.pid +OversignHeaders From +TrustAnchorFile /usr/share/dns/root.key +UserID opendkim +EOF + + destination = "/etc/opendkim.conf" + } + + provisioner "file" { + content = <<EOF +disable_plaintext_auth = no +mail_privileged_group = mail +mail_location = mbox:~/mail:INBOX=/var/mail/%u +userdb { + driver = passwd +} +passdb { + driver = passwd-file + args = scheme=sha256-crypt username_format=%n /etc/imap.passwd +} +protocols = " imap" + +service auth { + unix_listener /var/spool/postfix/private/auth { + group = postfix + mode = 0660 + user = postfix + } +} +ssl=required +ssl_cert = </etc/ssl/mail.cert.pem +ssl_key = </etc/ssl/private/mail.key.pem +EOF + + destination = "/etc/dovecot/dovecot.conf" + } + + provisioner "file" { + # content generated with + # echo "root:$(doveadm pw -s sha256-crypt -p "$(pass infra/root@crashbox.io)")" + content = "root:{SHA256-CRYPT}$5$Yymf6C.k4LgUaNla$UqKwSSIewxCyLV72zXNjfVI2s3xdicXmgCM99BwxWeB" + + destination = "/etc/imap.passwd" + } + + provisioner "remote-exec" { + inline = [ + "usermod --append --groups ssl-cert postfix", + "usermod --append --groups ssl-cert dovecot", + "systemctl restart opendkim.service postfix.service dovecot.service", + "ufw allow 25", + "ufw allow 587", + ] + } + + provisioner "remote-exec" { + when = "destroy" + + inline = [ + "DEBIAN_FRONTEND=noninteractive apt-get purge --yes postfix opendkim dovecot-core dovecot-imapd", + "rm -rf /etc/dkimkey/dkim.key", + "rm -f /etc/ssl/mail.cert.pem", + "rm -f /etc/ssl/private/mail.key.pem", + "ufw delete allow 25", + "ufw delete allow 587", + ] + } +} |