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nixpkgs/nixos/modules/programs/ssmtp.nix
2021-10-04 12:47:20 +02:00

191 lines
6.4 KiB
Nix

# Configuration for `ssmtp', a trivial mail transfer agent that can
# replace sendmail/postfix on simple systems. It delivers email
# directly to an SMTP server defined in its configuration file, without
# queueing mail locally.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.ssmtp;
in
{
imports = [
(mkRenamedOptionModule [ "networking" "defaultMailServer" "directDelivery" ] [ "services" "ssmtp" "enable" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "hostName" ] [ "services" "ssmtp" "hostName" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "domain" ] [ "services" "ssmtp" "domain" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "root" ] [ "services" "ssmtp" "root" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "useTLS" ] [ "services" "ssmtp" "useTLS" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "useSTARTTLS" ] [ "services" "ssmtp" "useSTARTTLS" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "authUser" ] [ "services" "ssmtp" "authUser" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "authPassFile" ] [ "services" "ssmtp" "authPassFile" ])
(mkRenamedOptionModule [ "networking" "defaultMailServer" "setSendmail" ] [ "services" "ssmtp" "setSendmail" ])
(mkRemovedOptionModule [ "networking" "defaultMailServer" "authPass" ] "authPass has been removed since it leaks the clear-text password into the world-readable store. Use authPassFile instead and make sure it's not a store path")
(mkRemovedOptionModule [ "services" "ssmtp" "authPass" ] "authPass has been removed since it leaks the clear-text password into the world-readable store. Use authPassFile instead and make sure it's not a store path")
];
options = {
services.ssmtp = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Use the trivial Mail Transfer Agent (MTA)
<command>ssmtp</command> package to allow programs to send
e-mail. If you don't want to run a real MTA like
<command>sendmail</command> or <command>postfix</command> on
your machine, set this option to <literal>true</literal>, and
set the option
<option>services.ssmtp.hostName</option> to the
host name of your preferred mail server.
'';
};
settings = mkOption {
type = with types; attrsOf (oneOf [ bool str ]);
default = {};
description = ''
<citerefentry><refentrytitle>ssmtp</refentrytitle><manvolnum>5</manvolnum></citerefentry> configuration. Refer
to <link xlink:href="https://linux.die.net/man/5/ssmtp.conf"/> for details on supported values.
'';
example = literalExpression ''
{
Debug = true;
FromLineOverride = false;
}
'';
};
hostName = mkOption {
type = types.str;
example = "mail.example.org";
description = ''
The host name of the default mail server to use to deliver
e-mail. Can also contain a port number (ex: mail.example.org:587),
defaults to port 25 if no port is given.
'';
};
root = mkOption {
type = types.str;
default = "";
example = "root@example.org";
description = ''
The e-mail to which mail for users with UID &lt; 1000 is forwarded.
'';
};
domain = mkOption {
type = types.str;
default = "";
example = "example.org";
description = ''
The domain from which mail will appear to be sent.
'';
};
useTLS = mkOption {
type = types.bool;
default = false;
description = ''
Whether TLS should be used to connect to the default mail
server.
'';
};
useSTARTTLS = mkOption {
type = types.bool;
default = false;
description = ''
Whether the STARTTLS should be used to connect to the default
mail server. (This is needed for TLS-capable mail servers
running on the default SMTP port 25.)
'';
};
authUser = mkOption {
type = types.str;
default = "";
example = "foo@example.org";
description = ''
Username used for SMTP auth. Leave blank to disable.
'';
};
authPassFile = mkOption {
type = types.nullOr types.str;
default = null;
example = "/run/keys/ssmtp-authpass";
description = ''
Path to a file that contains the password used for SMTP auth. The file
should not contain a trailing newline, if the password does not contain one
(e.g. use <command>echo -n "password" > file</command>).
This file should be readable by the users that need to execute ssmtp.
'';
};
setSendmail = mkOption {
type = types.bool;
default = true;
description = "Whether to set the system sendmail to ssmtp's.";
};
};
};
config = mkIf cfg.enable {
assertions = [
{
assertion = cfg.useSTARTTLS -> cfg.useTLS;
message = "services.ssmtp.useSTARTTLS has no effect without services.ssmtp.useTLS";
}
];
services.ssmtp.settings = mkMerge [
({
MailHub = cfg.hostName;
FromLineOverride = mkDefault true;
UseTLS = cfg.useTLS;
UseSTARTTLS = cfg.useSTARTTLS;
})
(mkIf (cfg.root != "") { root = cfg.root; })
(mkIf (cfg.domain != "") { rewriteDomain = cfg.domain; })
(mkIf (cfg.authUser != "") { AuthUser = cfg.authUser; })
(mkIf (cfg.authPassFile != null) { AuthPassFile = cfg.authPassFile; })
];
# careful here: ssmtp REQUIRES all config lines to end with a newline char!
environment.etc."ssmtp/ssmtp.conf".text = with generators; toKeyValue {
mkKeyValue = mkKeyValueDefault {
mkValueString = value:
if value == true then "YES"
else if value == false then "NO"
else mkValueStringDefault {} value
;
} "=";
} cfg.settings;
environment.systemPackages = [pkgs.ssmtp];
services.mail.sendmailSetuidWrapper = mkIf cfg.setSendmail {
program = "sendmail";
source = "${pkgs.ssmtp}/bin/sendmail";
setuid = false;
setgid = false;
owner = "root";
group = "root";
};
};
}