337 lines
10 KiB
Nix
337 lines
10 KiB
Nix
{
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flake,
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config,
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pkgs,
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lib,
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...
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}: let
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hzDomain = lib.concatStrings [ "hw" "dz" "z." "net" ];
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dkimDNSb12fio = ''
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default._domainkey IN TXT ( "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyla9hW3TvoXvZQxwzaJ4SZ9ict1HU3E6+FWlwNIgE6tIpTCyRJtiSIUDqB8TLTIBoxIs+QQBXZi+QUi3Agu6OSY2RiV0EwO8+oOOqOD9pERftc/aqe51cXuv4kPqwvpXEBwrXFWVM+VxivEubUJ7eKkFyXJpelv0LslXv/MmYbUyed6dF+reOGZCsvnbiRv74qdxbAL/25j62E8WrnxzJwhUtx/JhdBOjsHBvuw9hy6rZsVJL9eXayWyGRV6qmsLRzsRSBs+mDrgmKk4dugADd11+A03ics3i8hplRoWDkqnNKz1qy4f5TsV6v9283IANrAzRfHwX8EvNiFsBz+ZCQIDAQAB" ) ;
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'';
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dkimDNSmezzabiz = ''
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default._domainkey IN TXT ( "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDG8iuDq0eon2k7QlBJWGxwDiEv53iJQu2uqxOjr7Ul/nfQjuR6kVKs6oOVopnyFTGRpffrpSHHW1YUN5nF76p0fJphk4l+QmJP36/xweajsNU27PAkb88xG6yRKl28MCfPdMR96+Jobpei8S0UhqcskYs1aZybm7ci9ZuAMidziwIDAQAB" ) ;
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'';
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dkimDNShzDomain = ''
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default._domainkey IN TXT ( "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDvVA2XZno6g6qBdmxoLgX2Qmd883M6yV4YkE/VaNH6xcR0AcTo4hEYoAOPryfKn4FE/TYvyk/k2cyBKpMBn2qbVhwUavYQh/e9bweS2FKQvdzCUUoqXk04o2MqSXb2ZFwkUCtfrPcckBgpF754PDL4HMZGPnkMSdDX7bmYe37CWQIDAQAB") ;
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'';
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in {
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age.secrets."b12f.io-dkim-private-rsa" = {
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file = "${flake.self}/secrets/b12f.io-dkim-private-rsa.age";
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path = "/var/lib/maddy/dkim_keys/b12f.io_default.key";
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mode = "400";
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owner = "maddy";
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};
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age.secrets."mail@b12f.io-password" = {
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file = "${flake.self}/secrets/mail@b12f.io-password.age";
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mode = "400";
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owner = "maddy";
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};
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age.secrets."mezza.biz-dkim-private-rsa" = {
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file = "${flake.self}/secrets/mezza.biz-dkim-private-rsa.age";
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path = "/var/lib/maddy/dkim_keys/mezza.biz_default.key";
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mode = "400";
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owner = "maddy";
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};
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age.secrets."mail@mezza.biz-password" = {
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file = "${flake.self}/secrets/mail@mezza.biz-password.age";
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mode = "400";
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owner = "maddy";
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};
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age.secrets."hzdomain-dkim-private-rsa" = {
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file = "${flake.self}/secrets/hzdomain-dkim-private-rsa.age";
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path = "/var/lib/maddy/dkim_keys/hzdomain_default.key";
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mode = "400";
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owner = "maddy";
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};
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age.secrets."mail@hzdomain-password" = {
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file = "${flake.self}/secrets/mail@hzdomain-password.age";
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mode = "400";
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owner = "maddy";
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};
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users.users.maddy.extraGroups = [ "nginx" ];
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security.acme.certs = {
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"mail.b12f.io".reloadServices = [ "maddy" ];
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"b12f.io".reloadServices = [ "maddy" ];
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"mta-sts.b12f.io" = {};
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"mail.mezza.biz".reloadServices = [ "maddy" ];
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"mezza.biz".reloadServices = [ "maddy" ];
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"mta-sts.mezza.biz" = {};
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"mail.${hzDomain}".reloadServices = [ "maddy" ];
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"${hzDomain}".reloadServices = [ "maddy" ];
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"mta-sts.${hzDomain}" = {};
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};
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services.nginx.virtualHosts = builtins.foldl' (hosts: hostName: hosts // {
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"mta-sts.${hostName}" = {
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forceSSL = true;
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useACMEHost = "mta-sts.${hostName}";
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locations."/" = {
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root = pkgs.runCommand "create-well-known-mta-sts" {} ''
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mkdir -p "$out/.well-known"
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echo "
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version: STSv1
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mode: enforce
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max_age: 604800
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mx: mail.${hostName}
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" > "$out/.well-known/mta-sts.txt"
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'';
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tryFiles = "$uri $uri/ =404";
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};
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};
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}) {} [ "b12f.io" "mezza.biz" hzDomain ];
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systemd.tmpfiles.rules = [
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"d '/run/maddy' 0750 maddy maddy - -"
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];
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system.activationScripts.makeMaddyDKIMDNS = lib.stringAfter [ "var" ] ''
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mkdir -p /var/lib/maddy/dkim_keys
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echo '${dkimDNSb12fio}' >> /var/lib/maddy/dkim_keys/b12f.io_default.dns
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echo '${dkimDNSmezzabiz}' >> /var/lib/maddy/dkim_keys/mezza.biz_default.dns
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echo '${dkimDNShzDomain}' >> /var/lib/maddy/dkim_keys/${hzDomain}_default.dns
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chown -R maddy:maddy /var/lib/maddy
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'';
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networking.firewall.allowedTCPPorts = [ 25 ];
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networking.firewall.interfaces.wg-private.allowedTCPPorts = [ 465 587 993 ];
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services.maddy = {
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enable = true;
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openFirewall = false;
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hostname = "mail.b12f.io";
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primaryDomain = "b12f.io";
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localDomains = [
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"b12f.io"
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"mail.b12f.io"
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"mezza.biz"
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"mail.mezza.biz"
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hzDomain
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"mail.${hzDomain}"
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];
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ensureAccounts = [
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"mail@b12f.io"
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"mail@mezza.biz"
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"mail@${hzDomain}"
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];
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ensureCredentials = {
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# Do not use this in production. This will make passwords world-readable
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# in the Nix store
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"mail@b12f.io".passwordFile = config.age.secrets."mail@b12f.io-password".path;
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"mail@mezza.biz".passwordFile = config.age.secrets."mail@mezza.biz-password".path;
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"mail@${hzDomain}".passwordFile = config.age.secrets."mail@hzdomain-password".path;
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};
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tls = {
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loader = "file";
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certificates = [
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{
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keyPath = "${config.security.acme.certs."mail.b12f.io".directory}/key.pem";
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certPath = "${config.security.acme.certs."mail.b12f.io".directory}/cert.pem";
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}
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{
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keyPath = "${config.security.acme.certs."b12f.io".directory}/key.pem";
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certPath = "${config.security.acme.certs."b12f.io".directory}/cert.pem";
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}
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{
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keyPath = "${config.security.acme.certs."mail.mezza.biz".directory}/key.pem";
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certPath = "${config.security.acme.certs."mail.mezza.biz".directory}/cert.pem";
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}
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{
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keyPath = "${config.security.acme.certs."mezza.biz".directory}/key.pem";
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certPath = "${config.security.acme.certs."mezza.biz".directory}/cert.pem";
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}
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{
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keyPath = "${config.security.acme.certs."mail.${hzDomain}".directory}/key.pem";
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certPath = "${config.security.acme.certs."mail.${hzDomain}".directory}/cert.pem";
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}
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{
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keyPath = "${config.security.acme.certs."${hzDomain}".directory}/key.pem";
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certPath = "${config.security.acme.certs."${hzDomain}".directory}/cert.pem";
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}
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];
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};
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config = ''
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auth.pass_table local_authdb {
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table sql_table {
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driver sqlite3
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dsn credentials.db
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table_name passwords
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}
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}
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storage.imapsql local_mailboxes {
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driver sqlite3
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dsn imapsql.db
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}
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table.chain local_rewrites {
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optional_step regexp "(.+)\+(.+)@(.+)" "$1@$3"
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optional_step static {
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entry postmaster postmaster@$(primary_domain)
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}
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optional_step file /etc/maddy/aliases
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}
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msgpipeline local_routing {
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check {
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rspamd {
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api_path http://localhost:11334
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}
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}
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modify {
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replace_rcpt &local_rewrites
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}
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# at this point rcpt was normalized to either:
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# postmaster@$(primary_domain),
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# local_mailbox_without_tag@$(local_domains),
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# replacements with alias
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# destination_in block takes priority over destinations
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destination_in &local_mailboxes {
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deliver_to &local_mailboxes
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}
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# if rcpt is not in local_mailboxes, but has our domains,
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# replace rcpt to catchall and deliver it there
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destination $(local_domains) {
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modify {
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replace_rcpt regexp ".*" "mail@$(primary_domain)"
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}
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deliver_to &local_mailboxes
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}
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default_destination {
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reject 550 5.1.1 "User doesn't exist"
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}
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}
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smtp tcp://0.0.0.0:25 {
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limits {
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all rate 20 1s
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all concurrency 10
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}
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dmarc yes
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check {
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require_mx_record
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dkim
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spf
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}
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source $(local_domains) {
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reject 501 5.1.8 "Use Submission for outgoing SMTP"
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}
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default_source {
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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reject 550 5.1.1 "User doesn't exist"
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}
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}
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}
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submission tls://10.13.12.7:465 tls://[fd00:b12f:acab:1312:acab:7::]:465 tcp://10.13.12.7:587 tcp://[fd00:b12f:acab:1312:acab:7::]:587 {
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limits {
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all rate 50 1s
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}
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auth &local_authdb
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source $(local_domains) {
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check {
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authorize_sender {
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prepare_email &local_rewrites
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user_to_email identity
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}
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}
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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modify {
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dkim $(primary_domain) $(local_domains) default
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}
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deliver_to &remote_queue
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}
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}
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default_source {
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reject 501 5.1.8 "Non-local sender domain"
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}
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}
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target.remote outbound_delivery {
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limits {
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destination rate 20 1s
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destination concurrency 10
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}
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mx_auth {
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dane
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mtasts {
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cache fs
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fs_dir mtasts_cache/
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}
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local_policy {
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min_tls_level encrypted
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min_mx_level none
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}
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}
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}
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target.queue remote_queue {
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target &outbound_delivery
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autogenerated_msg_domain $(primary_domain)
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bounce {
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destination postmaster $(local_domains) {
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deliver_to &local_routing
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}
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default_destination {
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reject 550 5.0.0 "Refusing to send DSNs to non-local addresses"
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}
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}
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}
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imap tls://10.13.12.7:993 tls://[fd00:b12f:acab:1312:acab:7::]:993 {
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auth &local_authdb
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storage &local_mailboxes
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}
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'';
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};
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services.rspamd = {
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enable = true;
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locals."dkim_signing.conf".text = ''
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enabled = false;
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'';
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};
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systemd.services.rspamd.serviceConfig.SupplementaryGroups = [ "maddy" ];
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age.secrets."rclone-pubsolar.conf" = {
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file = "${flake.self}/secrets/rclone-pubsolar.conf.age";
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mode = "400";
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};
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age.secrets."restic-password" = {
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file = "${flake.self}/secrets/restic-password.age";
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mode = "400";
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};
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services.restic.backups = {
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maddy = {
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paths = [ "/var/lib/maddy" ];
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initialize = true;
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passwordFile = config.age.secrets."restic-password".path;
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# See https://www.hosting.de/blog/verschluesselte-backups-mit-rclone-und-restic-in-nextcloud/
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repository = "rclone:cloud.pub.solar:/backups/Maddy";
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rcloneConfigFile = config.age.secrets."rclone-pubsolar.conf".path;
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};
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};
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}
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