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https://github.com/NixOS/nixpkgs.git
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265c1c1472
postfix 2.11 is much more humane with respect to disk writes since it uses sockets (which do not change inodes on accesses) instead of fifos (which do).
406 lines
12 KiB
Nix
406 lines
12 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.postfix;
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user = cfg.user;
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group = cfg.group;
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setgidGroup = cfg.setgidGroup;
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mainCf =
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''
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queue_directory = /var/postfix/queue
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command_directory = ${pkgs.postfix}/sbin
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daemon_directory = ${pkgs.postfix}/libexec/postfix
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mail_owner = ${user}
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default_privs = nobody
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''
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+ optionalString config.networking.enableIPv6 ''
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inet_protocols = all
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''
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+ (if cfg.networks != null then
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''
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mynetworks = ${concatStringsSep ", " cfg.networks}
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''
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else if cfg.networksStyle != "" then
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''
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mynetworks_style = ${cfg.networksStyle}
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''
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else
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# Postfix default is subnet, but let's play safe
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''
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mynetworks_style = host
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'')
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+ optionalString (cfg.hostname != "") ''
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myhostname = ${cfg.hostname}
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''
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+ optionalString (cfg.domain != "") ''
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mydomain = ${cfg.domain}
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''
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+ optionalString (cfg.origin != "") ''
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myorigin = ${cfg.origin}
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''
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+ optionalString (cfg.destination != null) ''
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mydestination = ${concatStringsSep ", " cfg.destination}
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''
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+ optionalString (cfg.relayDomains != null) ''
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relay_domains = ${concatStringsSep ", " cfg.relayDomains}
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''
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+ ''
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local_recipient_maps =
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relayhost = ${if cfg.lookupMX || cfg.relayHost == "" then
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cfg.relayHost
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else
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"[" + cfg.relayHost + "]"}
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alias_maps = hash:/var/postfix/conf/aliases
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mail_spool_directory = /var/spool/mail/
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setgid_group = ${setgidGroup}
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''
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+ optionalString (cfg.sslCert != "") ''
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smtp_tls_CAfile = ${cfg.sslCACert}
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smtp_tls_cert_file = ${cfg.sslCert}
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smtp_tls_key_file = ${cfg.sslKey}
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smtp_use_tls = yes
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smtpd_tls_CAfile = ${cfg.sslCACert}
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smtpd_tls_cert_file = ${cfg.sslCert}
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smtpd_tls_key_file = ${cfg.sslKey}
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smtpd_use_tls = yes
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recipientDelimiter = ${cfg.recipientDelimiter}
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''
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+ optionalString (cfg.virtual != "") ''
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virtual_alias_maps = hash:/etc/postfix/virtual
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''
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+ cfg.extraConfig;
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masterCf = ''
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# ==========================================================================
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# service type private unpriv chroot wakeup maxproc command + args
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# (yes) (yes) (yes) (never) (100)
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# ==========================================================================
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smtp inet n - n - - smtpd
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#submission inet n - n - - smtpd
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# -o smtpd_tls_security_level=encrypt
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# -o smtpd_sasl_auth_enable=yes
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# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
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# -o milter_macro_daemon_name=ORIGINATING
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pickup unix n - n 60 1 pickup
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cleanup unix n - n - 0 cleanup
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qmgr unix n - n 300 1 qmgr
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tlsmgr unix - - n 1000? 1 tlsmgr
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rewrite unix - - n - - trivial-rewrite
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bounce unix - - n - 0 bounce
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defer unix - - n - 0 bounce
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trace unix - - n - 0 bounce
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verify unix - - n - 1 verify
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flush unix n - n 1000? 0 flush
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proxymap unix - - n - - proxymap
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proxywrite unix - - n - 1 proxymap
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smtp unix - - n - - smtp
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relay unix - - n - - smtp
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-o smtp_fallback_relay=
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# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
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showq unix n - n - - showq
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error unix - - n - - error
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retry unix - - n - - error
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discard unix - - n - - discard
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local unix - n n - - local
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virtual unix - n n - - virtual
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lmtp unix - - n - - lmtp
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anvil unix - - n - 1 anvil
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scache unix - - n - 1 scache
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${cfg.extraMasterConf}
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'';
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aliases =
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optionalString (cfg.postmasterAlias != "") ''
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postmaster: ${cfg.postmasterAlias}
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''
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+ optionalString (cfg.rootAlias != "") ''
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root: ${cfg.rootAlias}
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''
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+ cfg.extraAliases
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;
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aliasesFile = pkgs.writeText "postfix-aliases" aliases;
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virtualFile = pkgs.writeText "postfix-virtual" cfg.virtual;
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mainCfFile = pkgs.writeText "postfix-main.cf" mainCf;
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masterCfFile = pkgs.writeText "postfix-master.cf" masterCf;
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in
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{
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###### interface
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options = {
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services.postfix = {
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enable = mkOption {
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default = false;
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description = "Whether to run the Postfix mail server.";
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};
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setSendmail = mkOption {
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default = true;
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description = "Whether to set the system sendmail to postfix's.";
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};
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user = mkOption {
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default = "postfix";
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description = "What to call the Postfix user (must be used only for postfix).";
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};
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group = mkOption {
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default = "postfix";
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description = "What to call the Postfix group (must be used only for postfix).";
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};
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setgidGroup = mkOption {
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default = "postdrop";
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description = "
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How to call postfix setgid group (for postdrop). Should
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be uniquely used group.
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";
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};
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networks = mkOption {
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default = null;
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example = ["192.168.0.1/24"];
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description = "
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Net masks for trusted - allowed to relay mail to third parties -
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hosts. Leave empty to use mynetworks_style configuration or use
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default (localhost-only).
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";
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};
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networksStyle = mkOption {
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default = "";
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description = "
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Name of standard way of trusted network specification to use,
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leave blank if you specify it explicitly or if you want to use
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default (localhost-only).
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";
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};
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hostname = mkOption {
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default = "";
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description ="
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Hostname to use. Leave blank to use just the hostname of machine.
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It should be FQDN.
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";
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};
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domain = mkOption {
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default = "";
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description ="
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Domain to use. Leave blank to use hostname minus first component.
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";
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};
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origin = mkOption {
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default = "";
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description ="
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Origin to use in outgoing e-mail. Leave blank to use hostname.
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";
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};
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destination = mkOption {
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default = null;
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example = ["localhost"];
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description = "
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Full (!) list of domains we deliver locally. Leave blank for
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acceptable Postfix default.
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";
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};
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relayDomains = mkOption {
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default = null;
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example = ["localdomain"];
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description = "
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List of domains we agree to relay to. Default is the same as
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destination.
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";
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};
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relayHost = mkOption {
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default = "";
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description = "
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Mail relay for outbound mail.
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";
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};
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lookupMX = mkOption {
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default = false;
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description = "
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Whether relay specified is just domain whose MX must be used.
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";
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};
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postmasterAlias = mkOption {
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default = "root";
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description = "Who should receive postmaster e-mail.";
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};
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rootAlias = mkOption {
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default = "";
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description = "
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Who should receive root e-mail. Blank for no redirection.
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";
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};
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extraAliases = mkOption {
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default = "";
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description = "
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Additional entries to put verbatim into aliases file.
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";
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};
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extraConfig = mkOption {
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default = "";
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description = "
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Extra lines to be added verbatim to the main.cf configuration file.
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";
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};
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sslCert = mkOption {
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default = "";
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description = "SSL certificate to use.";
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};
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sslCACert = mkOption {
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default = "";
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description = "SSL certificate of CA.";
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};
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sslKey = mkOption {
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default = "";
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description = "SSL key to use.";
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};
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recipientDelimiter = mkOption {
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default = "";
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example = "+";
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description = "
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Delimiter for address extension: so mail to user+test can be handled by ~user/.forward+test
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";
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};
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virtual = mkOption {
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default = "";
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description = "
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Entries for the virtual alias map.
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";
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};
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extraMasterConf = mkOption {
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default = "";
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example = "submission inet n - n - - smtpd";
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description = "Extra lines to append to the generated master.cf file.";
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};
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};
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};
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###### implementation
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config = mkIf config.services.postfix.enable {
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environment = {
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etc = singleton
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{ source = "/var/postfix/conf";
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target = "postfix";
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};
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# This makes comfortable for root to run 'postqueue' for example.
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systemPackages = [ pkgs.postfix ];
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};
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services.mail.sendmailSetuidWrapper = mkIf config.services.postfix.setSendmail {
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program = "sendmail";
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source = "${pkgs.postfix}/bin/sendmail";
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owner = "nobody";
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group = "postdrop";
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setuid = false;
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setgid = true;
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};
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users.extraUsers = singleton
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{ name = user;
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description = "Postfix mail server user";
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uid = config.ids.uids.postfix;
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group = group;
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};
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users.extraGroups =
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[ { name = group;
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gid = config.ids.gids.postfix;
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}
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{ name = setgidGroup;
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gid = config.ids.gids.postdrop;
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}
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];
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jobs.postfix =
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# I copy _lots_ of shipped configuration filed
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# that can be left as is. I am afraid the exact
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# will list slightly change in next Postfix
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# release, so listing them all one-by-one in an
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# accurate way is unlikely to be better.
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{ description = "Postfix mail server";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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daemonType = "fork";
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preStart =
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''
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if ! [ -d /var/spool/postfix ]; then
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${pkgs.coreutils}/bin/mkdir -p /var/spool/mail /var/postfix/conf /var/postfix/queue
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fi
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${pkgs.coreutils}/bin/chown -R ${user}:${group} /var/postfix
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${pkgs.coreutils}/bin/chown -R ${user}:${setgidGroup} /var/postfix/queue
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${pkgs.coreutils}/bin/chmod -R ug+rwX /var/postfix/queue
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${pkgs.coreutils}/bin/chown root:root /var/spool/mail
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${pkgs.coreutils}/bin/chmod a+rwxt /var/spool/mail
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ln -sf "${pkgs.postfix}/share/postfix/conf/"* /var/postfix/conf
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ln -sf ${aliasesFile} /var/postfix/conf/aliases
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ln -sf ${virtualFile} /var/postfix/conf/virtual
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ln -sf ${mainCfFile} /var/postfix/conf/main.cf
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ln -sf ${masterCfFile} /var/postfix/conf/master.cf
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${pkgs.postfix}/sbin/postalias -c /var/postfix/conf /var/postfix/conf/aliases
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${pkgs.postfix}/sbin/postmap -c /var/postfix/conf /var/postfix/conf/virtual
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${pkgs.postfix}/sbin/postfix -c /var/postfix/conf start
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'';
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preStop = ''
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${pkgs.postfix}/sbin/postfix -c /var/postfix/conf stop
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'';
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};
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};
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}
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