Start dovecot before postfix and add target for certificates
It seemed weird to me that preStart on postfix was used to generate files not needed directly by postfix and for the self-signed certificate which is also needed by dovecot. nginx.service was also used as a proxy for when ACME certificate generation was done. So I have created mailserver-certificates.target for when certificates are available for other services. For self-signed that means that a new oneshot service called mailserver-selfsigned-certificate has been run. And for ACME this means that the target acme-selfsigned-certificates has been reached (which is when acme has created the self-signed certificates used before the actual certificates provided by LetsEncrypt are created). This setup has the added bonus that if you want to run a service to provide your own certificates you can set that to run before mailserver-certificates.target. DH Parameters are only needed by dovecot so generation of that file has been moved to the dovecot2 preStart. And lastly the only remaining reason to for dovecot to start before postfix was that the auth and lmtp sockets where located in a directory created by postfix. But since they could just as well be located in /run/dovecot2 as long as postfix has access to them I have moved them there.
This commit is contained in:
Brian Olsen
Ruben Maher
parent
0fbfbafb6e
commit
8a27b941bf
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@ -84,7 +84,7 @@ in
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''}
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service lmtp {
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unix_listener /var/lib/postfix/queue/private/dovecot-lmtp {
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unix_listener dovecot-lmtp {
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group = ${postfixCfg.group}
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mode = 0600
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user = ${postfixCfg.user}
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@ -106,7 +106,7 @@ in
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}
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service auth {
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unix_listener /var/lib/postfix/queue/private/auth {
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unix_listener auth {
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mode = 0660
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user = ${postfixCfg.user}
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group = ${postfixCfg.group}
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@ -121,11 +121,11 @@ in
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virtual_mailbox_domains = ${vhosts_file}
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virtual_mailbox_maps = hash:/var/lib/postfix/conf/valias
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virtual_alias_maps = hash:/var/lib/postfix/conf/valias
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virtual_transport = lmtp:unix:private/dovecot-lmtp
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virtual_transport = lmtp:unix:/run/dovecot2/dovecot-lmtp
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# sasl with dovecot
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smtpd_sasl_type = dovecot
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smtpd_sasl_path = private/auth
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smtpd_sasl_path = /run/dovecot2/auth
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smtpd_sasl_auth_enable = yes
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smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
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@ -158,7 +158,7 @@ in
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smtpd_tls_security_level = "encrypt";
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smtpd_sasl_auth_enable = "yes";
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smtpd_sasl_type = "dovecot";
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smtpd_sasl_path = "private/auth";
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smtpd_sasl_path = "/run/dovecot2/auth";
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smtpd_sasl_security_options = "noanonymous";
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smtpd_sasl_local_domain = "$myhostname";
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smtpd_client_restrictions = "permit_sasl_authenticated,reject";
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@ -19,37 +19,6 @@
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let
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cfg = config.mailserver;
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create_certificate = if cfg.certificateScheme == 2 then
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''
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# Create certificates if they do not exist yet
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dir="${cfg.certificateDirectory}"
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fqdn="${cfg.fqdn}"
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case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
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key="''${dir}/key-${cfg.fqdn}.pem";
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cert="''${dir}/cert-${cfg.fqdn}.pem";
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if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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(umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) &&
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"${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \
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-days 3650 -out "''${cert}"
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fi
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''
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else "";
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createDhParameterFile =
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''
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# Create a dh parameter file
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if [ ! -s "${cfg.certificateDirectory}/dh.pem" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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${pkgs.openssl}/bin/openssl \
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dhparam ${builtins.toString cfg.dhParamBitLength} \
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> "${cfg.certificateDirectory}/dh.pem"
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fi
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'';
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createDomainDkimCert = dom:
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let
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dkim_key = "${cfg.dkimKeyDirectory}/${dom}.${cfg.dkimSelector}.key";
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@ -76,34 +45,87 @@ let
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chown -R rmilter:rmilter "${cfg.dkimKeyDirectory}"
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'';
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createDhParameterFile = let
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dovecotVersion = builtins.fromJSON
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(builtins.readFile (pkgs.callPackage ./dovecot-version.nix {}));
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in lib.optionalString
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(dovecotVersion.major == 2 && dovecotVersion.minor >= 3)
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''
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# Create a dh parameter file
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if [ ! -s "${cfg.certificateDirectory}/dh.pem" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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${pkgs.openssl}/bin/openssl \
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dhparam ${builtins.toString cfg.dhParamBitLength} \
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> "${cfg.certificateDirectory}/dh.pem"
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fi
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'';
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preliminarySelfsigned = config.security.acme.preliminarySelfsigned;
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acmeWantsTarget = [ "acme-certificates.target" ]
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++ (lib.optional preliminarySelfsigned "acme-selfsigned-certificates.target");
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acmeAfterTarget = if preliminarySelfsigned
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then [ "acme-selfsigned-certificates.target" ]
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else [ "acme-certificates.target" ];
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in
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{
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config = with cfg; lib.mkIf enable {
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# Make sure postfix gets started first, so that the certificates are in place
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systemd.services.dovecot2.after = [ "postfix.service" ];
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# Add target for when certificates are available
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systemd.targets."mailserver-certificates" = {
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wants = lib.mkIf (cfg.certificateScheme == 3) acmeWantsTarget;
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after = lib.mkIf (cfg.certificateScheme == 3) acmeAfterTarget;
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};
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# Create certificates and maildir folder
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systemd.services.postfix = {
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after = (if (certificateScheme == 3) then [ "nginx.service" ] else []);
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preStart =
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''
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# Create self signed certificate
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systemd.services.mailserver-selfsigned-certificate = lib.mkIf (cfg.certificateScheme == 2) {
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wantedBy = [ "mailserver-certificates.target" ];
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after = [ "local-fs.target" ];
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before = [ "mailserver-certificates.target" ];
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script = ''
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# Create certificates if they do not exist yet
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dir="${cfg.certificateDirectory}"
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fqdn="${cfg.fqdn}"
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case $fqdn in /*) fqdn=$(cat "$fqdn");; esac
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key="''${dir}/key-${cfg.fqdn}.pem";
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cert="''${dir}/cert-${cfg.fqdn}.pem";
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if [ ! -f "''${key}" ] || [ ! -f "''${cert}" ]
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then
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mkdir -p "${cfg.certificateDirectory}"
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(umask 077; "${pkgs.openssl}/bin/openssl" genrsa -out "''${key}" 2048) &&
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"${pkgs.openssl}/bin/openssl" req -new -key "''${key}" -x509 -subj "/CN=''${fqdn}" \
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-days 3650 -out "''${cert}"
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fi
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'';
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serviceConfig = {
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Type = "oneshot";
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PrivateTmp = true;
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};
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};
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# Create maildir folder and dh parameters before dovecot startup
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systemd.services.dovecot2 = {
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after = [ "mailserver-certificates.target" ];
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wants = [ "mailserver-certificates.target" ];
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preStart = ''
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# Create mail directory and set permissions. See
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# <http://wiki2.dovecot.org/SharedMailboxes/Permissions>.
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mkdir -p "${mailDirectory}"
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chgrp "${vmailGroupName}" "${mailDirectory}"
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chmod 02770 "${mailDirectory}"
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${create_certificate}
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${let
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dovecotVersion = builtins.fromJSON
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(builtins.readFile (pkgs.callPackage ./dovecot-version.nix {}));
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in lib.optionalString
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(dovecotVersion.major == 2 && dovecotVersion.minor >= 3)
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createDhParameterFile}
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${createDhParameterFile}
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'';
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};
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# Postfix requires rmilter socket, dovecot lmtp socket, dovecot auth socket and certificate to work
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systemd.services.postfix = {
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after = [ "rmilter.socket" "dovecot2.service" "mailserver-certificates.target" ];
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wants = [ "mailserver-certificates.target" ];
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requires = [ "rmilter.socket" "dovecot2.service" ];
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};
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# Create dkim certificates
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systemd.services.rmilter = {
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requires = [ "rmilter.socket" ];
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