207 lines
7.4 KiB
Nix
207 lines
7.4 KiB
Nix
{ config, lib, ... }:
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let
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submissionOptions = {
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smtpd_tls_security_level = "encrypt";
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smtpd_sasl_auth_enable = "yes";
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smtpd_sasl_type = "dovecot";
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smtpd_sasl_path = "/run/dovecot2/auth";
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smtpd_sasl_security_options = "noanonymous";
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smtpd_sasl_local_domain = "uninsane.org";
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smtpd_client_restrictions = "permit_sasl_authenticated,reject";
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# reuse the virtual map so that sender mapping matches recipient mapping
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smtpd_sender_login_maps = "hash:/var/lib/postfix/conf/virtual";
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smtpd_sender_restrictions = "reject_sender_login_mismatch";
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smtpd_recipient_restrictions = "reject_non_fqdn_recipient,permit_sasl_authenticated,reject";
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};
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in
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{
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sane.persist.sys.plaintext = [
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# TODO: mode? could be more granular
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{ user = "opendkim"; group = "opendkim"; directory = "/var/lib/opendkim"; }
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{ user = "root"; group = "root"; directory = "/var/lib/postfix"; }
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{ user = "root"; group = "root"; directory = "/var/spool/mail"; }
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# *probably* don't need these dirs:
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# "/var/lib/dhparams" # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/security/dhparams.nix
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# "/var/lib/dovecot"
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];
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networking.firewall.allowedTCPPorts = [
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25 # SMTP
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143 # IMAP
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465 # SMTPS
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587 # SMTPS/submission
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993 # IMAPS
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];
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# exists only to manage certs for dovecot
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services.nginx.virtualHosts."imap.uninsane.org" = {
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enableACME = true;
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};
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# exists only to manage certs for Postfix
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services.nginx.virtualHosts."mx.uninsane.org" = {
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enableACME = true;
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};
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sane.services.trust-dns.zones."uninsane.org".inet = {
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MX."@" = "10 mx.uninsane.org.";
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# XXX: RFC's specify that the MX record CANNOT BE A CNAME
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A."mx" = "185.157.162.178";
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CNAME."imap" = "native";
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# Sender Policy Framework:
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# +mx => mail passes if it originated from the MX
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# +a => mail passes if it originated from the A address of this domain
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# +ip4:.. => mail passes if it originated from this IP
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# -all => mail fails if none of these conditions were met
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TXT."@" = "v=spf1 a mx -all";
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# DKIM public key:
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TXT."mx._domainkey" =
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"v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCkSyMufc2KrRx3j17e/LyB+3eYSBRuEFT8PUka8EDX04QzCwDPdkwgnj3GNDvnB5Ktb05Cf2SJ/S1OLqNsINxJRWtkVfZd/C339KNh9wrukMKRKNELL9HLUw0bczOI4gKKFqyrRE9qm+4csCMAR79Te9FCjGV/jVnrkLdPT0GtFwIDAQAB"
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;
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# DMARC fields <https://datatracker.ietf.org/doc/html/rfc7489>:
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# p=none|quarantine|reject: what to do with failures
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# sp = p but for subdomains
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# rua = where to send aggregrate reports
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# ruf = where to send individual failure reports
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# fo=0|1|d|s controls WHEN to send failure reports
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# (1=on bad alignment; d=on DKIM failure; s=on SPF failure);
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# Additionally:
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# adkim=r|s (is DKIM relaxed [default] or strict)
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# aspf=r|s (is SPF relaxed [default] or strict)
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# pct = sampling ratio for punishing failures (default 100 for 100%)
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# rf = report format
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# ri = report interval
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TXT."_dmarc" =
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"v=DMARC1;p=quarantine;sp=reject;rua=mailto:admin+mail@uninsane.org;ruf=mailto:admin+mail@uninsane.org;fo=1:d:s"
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;
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};
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services.postfix.enable = true;
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services.postfix.hostname = "mx.uninsane.org";
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services.postfix.origin = "uninsane.org";
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services.postfix.destination = [ "localhost" "uninsane.org" ];
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services.postfix.sslCert = "/var/lib/acme/mx.uninsane.org/fullchain.pem";
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services.postfix.sslKey = "/var/lib/acme/mx.uninsane.org/key.pem";
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services.postfix.virtual = ''
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notify.matrix@uninsane.org matrix-synapse
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@uninsane.org colin
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'';
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services.postfix.extraConfig = ''
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# smtpd_milters = local:/run/opendkim/opendkim.sock
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# milter docs: http://www.postfix.org/MILTER_README.html
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# mail filters for receiving email and authorized SMTP clients
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# smtpd_milters = inet:185.157.162.190:8891
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smtpd_milters = unix:/run/opendkim/opendkim.sock
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# mail filters for sendmail
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non_smtpd_milters = $smtpd_milters
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milter_default_action = accept
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inet_protocols = ipv4
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smtp_tls_security_level = may
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'';
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services.postfix.enableSubmission = true;
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services.postfix.submissionOptions = submissionOptions;
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services.postfix.enableSubmissions = true;
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services.postfix.submissionsOptions = submissionOptions;
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systemd.services.postfix.after = [ "wireguard-wg0.service" ];
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systemd.services.postfix.partOf = [ "wireguard-wg0.service" ];
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systemd.services.postfix.serviceConfig = {
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# run this behind the OVPN static VPN
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NetworkNamespacePath = "/run/netns/ovpns";
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};
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services.opendkim.enable = true;
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# services.opendkim.domains = "csl:uninsane.org";
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services.opendkim.domains = "uninsane.org";
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# we use a custom (inet) socket, because the default perms
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# of the unix socket don't allow postfix to connect.
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# this sits on the machine-local 10.0.1 interface because it's the closest
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# thing to a loopback interface shared by postfix and opendkim netns.
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# services.opendkim.socket = "inet:8891@185.157.162.190";
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# services.opendkim.socket = "local:/run/opendkim.sock";
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# selectors can be used to disambiguate sender machines.
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# keeping this the same as the hostname seems simplest
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services.opendkim.selector = "mx";
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systemd.services.opendkim.after = [ "wireguard-wg0.service" ];
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systemd.services.opendkim.partOf = [ "wireguard-wg0.service" ];
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systemd.services.opendkim.serviceConfig = {
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# run this behind the OVPN static VPN
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NetworkNamespacePath = "/run/netns/ovpns";
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# /run/opendkim/opendkim.sock needs to be rw by postfix
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UMask = lib.mkForce "0011";
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};
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# inspired by https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/
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services.dovecot2.enable = true;
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services.dovecot2.sslServerCert = "/var/lib/acme/imap.uninsane.org/fullchain.pem";
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services.dovecot2.sslServerKey = "/var/lib/acme/imap.uninsane.org/key.pem";
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services.dovecot2.enablePAM = false;
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services.dovecot2.extraConfig =
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let
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passwdFile = config.sops.secrets.dovecot_passwd.path;
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in
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''
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passdb {
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driver = passwd-file
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args = ${passwdFile}
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}
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userdb {
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driver = passwd-file
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args = ${passwdFile}
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}
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# allow postfix to query our auth db
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service auth {
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unix_listener auth {
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mode = 0660
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user = postfix
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group = postfix
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}
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}
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auth_mechanisms = plain login
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mail_debug = yes
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auth_debug = yes
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# verbose_ssl = yes
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'';
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#### OUTGOING MESSAGE REWRITING:
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services.postfix.enableHeaderChecks = true;
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services.postfix.headerChecks = [
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# intercept gitea registration confirmations and manually screen them
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{
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# headerChecks are somehow ignorant of alias rules: have to redirect to a real user
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action = "REDIRECT colin@uninsane.org";
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pattern = "/^Subject: Please activate your account/";
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}
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# intercept Matrix registration confirmations
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{
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action = "REDIRECT colin@uninsane.org";
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pattern = "/^Subject:.*Validate your email/";
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}
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# XXX postfix only supports performing ONE action per header.
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# {
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# action = "REPLACE Subject: git application: Please activate your account";
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# pattern = "/^Subject:.*activate your account/";
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# }
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];
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sops.secrets.dovecot_passwd = {
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sopsFile = ../../../secrets/servo.yaml;
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owner = config.users.users.dovecot2.name;
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# TODO: debug why mail can't be sent without this being world-readable
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mode = "0444";
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};
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}
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