39bd9be5a9
Make top level /var/lib/postfix as root:root 0755 After generating custom configs in /var/lib/postfix/conf, `postfix set-permissions` called, to perform all required tricks related to queue handling (postfix use file mode bits to keep some internal statuses, so `chmod -R` not recommended by authors, see comments in $out/libexec/postfix/post-install for details) Also post-install script was patched, to skip permission check/update for files inside $out, as well as symlinks following to $NIX_STORE. Config file `main.cf` extended with all default directory locations, to prevent post-install script from guessing and overwrite them. And finally all actions in activation script snippets performed by postmap/postalias/postfix tools from current build, not random one from paths.
499 lines
15 KiB
Nix
499 lines
15 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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haveAliases = cfg.postmasterAlias != "" || cfg.rootAlias != "" || cfg.extraAliases != "";
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haveTransport = cfg.transport != "";
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haveVirtual = cfg.virtual != "";
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mainCf =
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''
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compatibility_level = 2
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mail_owner = ${user}
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default_privs = nobody
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# NixOS specific locations
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data_directory = /var/lib/postfix/data
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queue_directory = /var/lib/postfix/queue
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# Default location of everything in package
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meta_directory = ${pkgs.postfix}/etc/postfix
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command_directory = ${pkgs.postfix}/bin
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sample_directory = /etc/postfix
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newaliases_path = ${pkgs.postfix}/bin/newaliases
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mailq_path = ${pkgs.postfix}/bin/mailq
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readme_directory = no
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sendmail_path = ${pkgs.postfix}/bin/sendmail
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daemon_directory = ${pkgs.postfix}/libexec/postfix
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manpage_directory = ${pkgs.postfix}/share/man
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html_directory = ${pkgs.postfix}/share/postfix/doc/html
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shlib_directory = no
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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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"")
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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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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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''
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+ optionalString (cfg.recipientDelimiter != "") ''
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recipient_delimiter = ${cfg.recipientDelimiter}
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''
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+ optionalString haveAliases ''
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alias_maps = hash:/etc/postfix/aliases
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''
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+ optionalString haveTransport ''
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transport_maps = hash:/etc/postfix/transport
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''
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+ optionalString haveVirtual ''
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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) (no) (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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''
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+ optionalString cfg.enableSmtp ''
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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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''
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+ ''
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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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transportFile = pkgs.writeText "postfix-transport" cfg.transport;
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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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type = types.bool;
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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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enableSmtp = mkOption {
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default = true;
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description = "Whether to enable smtp in master.cf.";
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};
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setSendmail = mkOption {
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type = types.bool;
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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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type = types.str;
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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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type = types.str;
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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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type = types.str;
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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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type = types.nullOr (types.listOf types.str);
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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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type = types.str;
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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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type = types.str;
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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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type = types.str;
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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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type = types.str;
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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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type = types.nullOr (types.listOf types.str);
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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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type = types.nullOr (types.listOf types.str);
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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 empty.
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";
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};
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relayHost = mkOption {
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type = types.str;
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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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type = types.bool;
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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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type = types.str;
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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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type = types.str;
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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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type = types.lines;
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default = "";
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description = "
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Additional entries to put verbatim into aliases file, cf. man-page aliases(8).
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";
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};
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extraConfig = mkOption {
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type = types.lines;
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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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type = types.str;
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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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type = types.str;
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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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type = types.str;
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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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type = types.str;
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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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type = types.lines;
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default = "";
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description = "
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Entries for the virtual alias map, cf. man-page virtual(8).
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";
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};
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transport = mkOption {
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default = "";
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description = "
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Entries for the transport map, cf. man-page transport(8).
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";
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};
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extraMasterConf = mkOption {
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type = types.lines;
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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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aliasFiles = mkOption {
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type = types.attrsOf types.path;
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default = {};
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description = "Aliases' tables to be compiled and placed into /var/lib/postfix/conf.";
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};
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mapFiles = mkOption {
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type = types.attrsOf types.path;
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default = {};
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description = "Maps to be compiled and placed into /var/lib/postfix/conf.";
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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 (mkMerge [
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{
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environment = {
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etc = singleton
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{ source = "/var/lib/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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group = setgidGroup;
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setuid = false;
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setgid = true;
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};
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users.extraUsers = optional (user == "postfix")
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{ name = "postfix";
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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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optional (group == "postfix")
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{ name = group;
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gid = config.ids.gids.postfix;
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}
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++ optional (setgidGroup == "postdrop")
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{ name = setgidGroup;
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gid = config.ids.gids.postdrop;
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};
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systemd.services.postfix =
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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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path = [ pkgs.postfix ];
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serviceConfig = {
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Type = "forking";
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Restart = "always";
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PIDFile = "/var/lib/postfix/queue/pid/master.pid";
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ExecStart = "${pkgs.postfix}/bin/postfix start";
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ExecStop = "${pkgs.postfix}/bin/postfix stop";
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ExecReload = "${pkgs.postfix}/bin/postfix reload";
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};
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preStart = ''
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# Backwards compatibility
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if [ ! -d /var/lib/postfix ] && [ -d /var/postfix ]; then
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mkdir -p /var/lib
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mv /var/postfix /var/lib/postfix
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fi
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# All permissions set according ${pkgs.postfix}/etc/postfix/postfix-files script
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mkdir -p /var/lib/postfix /var/lib/postfix/queue/{pid,public,maildrop}
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chmod 0755 /var/lib/postfix
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chown root:root /var/lib/postfix
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rm -rf /var/lib/postfix/conf
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mkdir -p /var/lib/postfix/conf
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chmod 0755 /var/lib/postfix/conf
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ln -sf ${pkgs.postfix}/etc/postfix/postfix-files
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ln -sf ${mainCfFile} /var/lib/postfix/conf/main.cf
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ln -sf ${masterCfFile} /var/lib/postfix/conf/master.cf
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${concatStringsSep "\n" (mapAttrsToList (to: from: ''
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ln -sf ${from} /var/lib/postfix/conf/${to}
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${pkgs.postfix}/bin/postalias /var/lib/postfix/conf/${to}
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'') cfg.aliasFiles)}
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${concatStringsSep "\n" (mapAttrsToList (to: from: ''
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ln -sf ${from} /var/lib/postfix/conf/${to}
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${pkgs.postfix}/bin/postmap /var/lib/postfix/conf/${to}
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'') cfg.mapFiles)}
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mkdir -p /var/spool/mail
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chown root:root /var/spool/mail
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chmod a+rwxt /var/spool/mail
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ln -sf /var/spool/mail /var/
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#Finally delegate to postfix checking remain directories in /var/lib/postfix and set permissions on them
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${pkgs.postfix}/bin/postfix set-permissions config_directory=/var/lib/postfix/conf
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'';
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};
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}
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(mkIf haveAliases {
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services.postfix.aliasFiles."aliases" = aliasesFile;
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})
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(mkIf haveTransport {
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services.postfix.mapFiles."transport" = transportFile;
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})
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(mkIf haveVirtual {
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services.postfix.mapFiles."virtual" = virtualFile;
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})
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]);
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}
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