94 lines
2.7 KiB
Nix
94 lines
2.7 KiB
Nix
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{ config, tools, ... }:
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let
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inherit (tools.meta) domain;
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certDir = config.security.acme.certs."mail.${domain}".directory;
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receivePolicy = [ "permit_sasl_authenticated" "permit_mynetworks" "reject_unauth_destination" ];
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spamPolicy = [ "reject_sender_login_mismatch" "permit_sasl_authenticated" "pcre:${./known-spam-domains}" ];
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dkimSocket = builtins.replaceStrings ["local:"] ["unix:"] config.services.opendkim.socket;
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lmtpSocket = "lmtp:unix:/run/dovecot2/lmtp";
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postfixLdapMailboxes = "ldap:${config.age.secrets."postfix-ldap-mailboxes.cf".path}";
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in
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{
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age.secrets."postfix-ldap-mailboxes.cf" = {
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file = ../../../../secrets/postfix-ldap-mailboxes.age;
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owner = "postfix";
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group = "postfix";
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mode = "0400";
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};
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networking.firewall.allowedTCPPorts = [ 25 465 587 ];
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services.postfix = {
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enable = true;
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enableSubmission = true;
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enableSubmissions = true;
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inherit domain;
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origin = domain;
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recipientDelimiter = "+";
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# TODO: replace with proper certs
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sslCert = "/var/lib/acme/mail.${domain}/fullchain.pem";
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sslKey = "/var/lib/acme/mail.${domain}/key.pem";
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#sslCert = "${certDir}/fullchain.pem";
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#sslKey = "${certDir}/privkey.pem";
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setSendmail = true;
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# TODO: un-hardcode
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networks = [
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"localhost"
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"10.1.0.1/32"
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"10.10.0.0/16"
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"10.100.0.0/16"
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];
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aliasFiles.genericAliases = ./generic-aliases;
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config = {
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myhostname = "mx.${domain}";
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# TODO: un-hardcode + add ip address instead of $myhostname
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inet_interfaces = [ "localhost" "$myhostname" "10.1.0.1" ];
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disable_vrfy_command = true;
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# authorization policies
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smtpd_recipient_restrictions = receivePolicy;
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smtpd_relay_restrictions = receivePolicy;
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smtpd_sender_restrictions = spamPolicy;
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smtpd_sender_login_maps = postfixLdapMailboxes;
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# authentication
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# TODO: review these options
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smtpd_sasl_auth_enable = true;
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smtpd_sasl_type = "dovecot";
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smtpd_sasl_path = "/run/dovecot2/auth";
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smtpd_sasl_local_domain = domain;
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smtpd_sasl_security_options = "noanonymous";
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smtpd_sasl_tls_security_options = "noanonymous";
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smtpd_sasl_authenticated_header = true;
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broken_sasl_auth_clients = false;
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smtpd_milters = dkimSocket;
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non_smtpd_milters = dkimSocket;
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# delivery
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virtual_mailbox_domains = [ domain "max.admin.${domain}" ];
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virtual_transport = lmtpSocket;
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mailbox_transport = lmtpSocket;
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virtual_mailbox_maps = postfixLdapMailboxes;
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virtual_alias_maps = [
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postfixLdapMailboxes
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"regexp:${./virtual-mail-domain-aliases}"
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"hash:/var/lib/postfix/conf/genericAliases"
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];
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};
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};
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services.fail2ban.jails.postfix = ''
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enabled = true
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'';
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}
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