nixpkgs/modules/services/mail/postfix.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption mkIf;
options = {
services = {
postfix = {
enable = mkOption {
default = false;
description ="
Whether to run the Postfix mail server.
";
};
user = mkOption {
default = "postfix";
description = "
How to call postfix user (must be used only for postfix).
";
};
group = mkOption {
default = "postfix";
description = "
How to call postfix group (must be used only for postfix).
";
};
setgidGroup = mkOption {
default = "postdrop";
description = "
How to call postfix setgid group (for postdrop). Should
be uniquely used group.
";
};
networks = mkOption {
default = null;
example = ["192.168.0.1/24"];
description = "
Net masks for trusted - allowed to relay mail to third parties -
hosts. Leave empty to use mynetworks_style configuration or use
default (localhost-only).
";
};
networksStyle = mkOption {
default = "";
description = "
Name of standard way of trusted network specification to use,
leave blank if you specify it explicitly or if you want to use
default (localhost-only).
";
};
hostname = mkOption {
default = "";
description ="
Hostname to use. Leave blank to use just the hostname of machine.
It should be FQDN.
";
};
domain = mkOption {
default = "";
description ="
Domain to use. Leave blank to use hostname minus first component.
";
};
origin = mkOption {
default = "";
description ="
Origin to use in outgoing e-mail. Leave blank to use hostname.
";
};
destination = mkOption {
default = null;
example = ["localhost"];
description = "
Full (!) list of domains we deliver locally. Leave blank for
acceptable Postfix default.
";
};
relayDomains = mkOption {
default = null;
example = ["localdomain"];
description = "
List of domains we agree to relay to. Default is the same as
destination.
";
};
relayHost = mkOption {
default = "";
description = "
Mail relay for outbound mail.
";
};
lookupMX = mkOption {
default = false;
description = "
Whether relay specified is just domain whose MX must be used.
";
};
postmasterAlias = mkOption {
default = "root";
description = "
Who should receive postmaster e-mail.
";
};
rootAlias = mkOption {
default = "";
description = "
Who should receive root e-mail. Blank for no redirection.
";
};
extraAliases = mkOption {
default = "";
description = "
Additional entries to put verbatim into aliases file.
";
};
sslCert = mkOption {
default = "";
description = "
SSL certificate to use.
";
};
sslCACert = mkOption {
default = "";
description = "
SSL certificate of CA.
";
};
sslKey = mkOption {
default = "";
description ="
SSL key to use.
";
};
recipientDelimiter = mkOption {
default = "";
example = "+";
description = "
Delimiter for address extension: so mail to user+test can be handled by ~user/.forward+test
";
};
};
};
};
in
###### implementation
let
startingDependency = if config.services.gw6c.enable then "gw6c" else "network-interfaces";
cfg = config.services.postfix;
user = cfg.user;
group = cfg.group;
setgidGroup = cfg.setgidGroup;
optionalString = pkgs.lib.optionalString;
concatStringsSep = pkgs.lib.concatStringsSep;
mainCf =
''
queue_directory = /var/postfix/queue
command_directory = ${pkgs.postfix}/sbin
daemon_directory = ${pkgs.postfix}/libexec/postfix
mail_owner = ${user}
default_privs = nobody
''
+ optionalString (config.services.gw6c.enable || config.networking.nativeIPv6) (''
inet_protocols = all
'')
+
(if cfg.networks!=null then
(''
mynetworks = ${concatStringsSep ", " cfg.networks}
'')
else if (cfg.networksStyle != "") then
(''
mynetworks_style = ${cfg.networksStyle}
'')
else
# Postfix default is subnet, but let's play safe
(''
mynetworks_style = host
'')
)
+ optionalString (cfg.hostname != "") (''
myhostname = ${cfg.hostname}
'')
+ optionalString (cfg.domain != "") (''
mydomain = ${cfg.domain}
'')
+ optionalString (cfg.origin != "") (''
myorigin = ${cfg.origin}
'')
+ optionalString (cfg.destination != null) (''
mydestination = ${concatStringsSep ", " cfg.destination}
'')
+ optionalString (cfg.relayDomains != null) (''
relay_domains = ${concatStringsSep ", " cfg.relayDomains}
'')
+ ''
local_recipient_maps =
''
+ (''
relayhost = ${if cfg.lookupMX || cfg.relayHost == "" then
cfg.relayHost
else
"[" + cfg.relayHost + "]"}
'')
+ (''
alias_maps = hash:/var/postfix/conf/aliases
mail_spool_directory = /var/spool/mail/
setgid_group = ${setgidGroup}
'')
+ optionalString (cfg.sslCert != "") (''
smtp_tls_CAfile = ${cfg.sslCACert}
smtp_tls_cert_file = ${cfg.sslCert}
smtp_tls_key_file = ${cfg.sslKey}
smtp_use_tls = yes
smtpd_tls_CAfile = ${cfg.sslCACert}
smtpd_tls_cert_file = ${cfg.sslCert}
smtpd_tls_key_file = ${cfg.sslKey}
smtpd_use_tls = yes
recipientDelimiter = ${cfg.recipientDelimiter}
'')
;
aliases =
(optionalString (cfg.postmasterAlias != "") (''
postmaster: ${cfg.postmasterAlias}
''))
+
(optionalString (cfg.rootAlias != "") (''
root: ${cfg.rootAlias}
''))
+ cfg.extraAliases
;
aliasesFile = pkgs.writeText "postfix-aliases" aliases;
mainCfFile = pkgs.writeText "postfix-main.cf" mainCf;
in
mkIf config.services.postfix.enable {
require = [
options
];
environment = {
etc = [{
source = "/var/postfix/conf";
target = "postfix";
}];
};
users = {
extraUsers = [
{ name = user;
description = "Postfix mail server user";
uid = config.ids.uids.postfix;
group = group;
}
];
extraGroups = [
{ name = group;
gid = config.ids.gids.postfix;
}
{ name = setgidGroup;
gid = config.ids.gids.postdrop;
}
];
};
services = {
extraJobs = [{
name = "postfix";
# I copy _lots_ of shipped configuration filed
# that can be left as is. I am afraid the exact
# will list slightly change in next Postfix
# release, so listing them all one-by-one in an
# accurate way is unlikely to be better.
job = ''
description "Postfix mail server job"
start on ${startingDependency}/started
stop on never
script
if ! [ -d /var/spool/postfix ]; then
${pkgs.coreutils}/bin/mkdir -p /var/spool/mail /var/postfix/conf /var/postfix/queue
fi
${pkgs.coreutils}/bin/chown -R ${user}.${group} /var/postfix
${pkgs.coreutils}/bin/chown -R ${user}.${setgidGroup} /var/postfix/queue
${pkgs.coreutils}/bin/chmod -R ug+rwX /var/postfix/queue
${pkgs.coreutils}/bin/chown root.root /var/spool/mail
${pkgs.coreutils}/bin/chmod a+rwxt /var/spool/mail
ln -sf ${pkgs.postfix}/share/postfix/conf/* /var/postfix/conf
ln -sf ${aliasesFile} /var/postfix/conf/aliases
ln -sf ${mainCfFile} /var/postfix/conf/main.cf
${pkgs.postfix}/sbin/postalias -c /var/postfix/conf /var/postfix/conf/aliases
${pkgs.postfix}/sbin/postfix -c /var/postfix/conf start
end script
'';
}];
};
}