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|
{
config,
lib,
pkgs,
...
}:
let
inherit (lib)
hasPrefix
mkEnableOption
mkIf
mkMerge
mkOption
mkPackageOption
types
;
cfg = config.services.postfix-tlspol;
format = pkgs.formats.yaml_1_2 { };
configFile = format.generate "postfix-tlspol.yaml" cfg.settings;
in
{
meta.maintainers = pkgs.postfix-tlspol.meta.maintainers;
options.services.postfix-tlspol = {
enable = mkEnableOption "postfix-tlspol";
package = mkPackageOption pkgs "postfix-tlspol" { };
settings = mkOption {
type = types.submodule {
freeformType = format.type;
options = {
server = {
address = mkOption {
type = types.str;
default = "unix:/run/postfix-tlspol/tlspol.sock";
example = "127.0.0.1:8642";
description = ''
Path or address/port where postfix-tlspol binds its socket to.
'';
};
socket-permissions = mkOption {
type = types.str;
default = "0660";
readOnly = true;
description = ''
Permissions to the UNIX socket, if configured.
::: {.note}
Due to hardening on the systemd unit the socket can never be created world readable/writable.
:::
'';
apply = value: (fromTOML "v=0o${value}").v;
};
log-level = mkOption {
type = types.enum [
"debug"
"info"
"warn"
"error"
];
default = "info";
example = "warn";
description = ''
Log level
'';
};
prefetch = mkOption {
type = types.bool;
default = true;
example = false;
description = ''
Whether to prefetch DNS records when the TTL of a cached record is about to expire.
'';
};
cache-file = mkOption {
type = types.path;
default = "/var/cache/postfix-tlspol/cache.db";
readOnly = true;
description = ''
Path to the cache file.
'';
};
};
dns = {
address = mkOption {
type = with types; nullOr str;
default = null;
example = "127.0.0.1:53";
description = ''
IP and port to your DNS resolver.
Uses resolvers from /etc/resolv.conf if unset.
::: {.note}
The configured DNS resolver must validate DNSSEC signatures.
:::
'';
};
};
};
};
default = { };
description = ''
The postfix-tlspol configuration file as a Nix attribute set.
See the reference documentation for possible options.
<https://github.com/Zuplu/postfix-tlspol/blob/main/configs/config.default.yaml>
'';
};
configurePostfix = mkOption {
type = types.bool;
default = true;
description = ''
Whether to configure the required settings to use postfix-tlspol in the local Postfix instance.
'';
};
};
config = mkMerge [
(mkIf (cfg.enable && config.services.postfix.enable && cfg.configurePostfix) {
# https://github.com/Zuplu/postfix-tlspol#postfix-configuration
services.postfix.settings.main = {
smtp_dns_support_level = "dnssec";
smtp_tls_security_level = "dane";
smtp_tls_policy_maps =
let
address =
if (hasPrefix "unix:" cfg.settings.server.address) then
cfg.settings.server.address
else
"inet:${cfg.settings.server.address}";
in
[ "socketmap:${address}:QUERYwithTLSRPT" ];
};
systemd.services.postfix = {
wants = [ "postfix-tlspol.service" ];
after = [ "postfix-tlspol.service" ];
};
users.users.postfix.extraGroups = [ "postfix-tlspol" ];
})
(mkIf cfg.enable {
environment.etc."postfix-tlspol/config.yaml".source = configFile;
environment.systemPackages = [ cfg.package ];
users.users.postfix-tlspol = {
isSystemUser = true;
group = "postfix-tlspol";
};
users.groups.postfix-tlspol = { };
systemd.sockets.postfix-tlspol = {
wantedBy = [ "sockets.target" ];
socketConfig = {
Accept = false;
ListenStream = [
(lib.removePrefix "unix:" cfg.settings.server.address)
];
SocketUser = "postfix-tlspol";
SocketGroup = "postfix-tlspol";
SocketMode = cfg.settings.server.socket-permissions;
DirectoryMode = "0755";
};
};
systemd.services.postfix-tlspol = {
after = [
"nss-lookup.target"
"network-online.target"
];
wants = [
"nss-lookup.target"
"network-online.target"
];
description = "Postfix DANE/MTA-STS TLS policy socketmap service";
documentation = [ "https://github.com/Zuplu/postfix-tlspol" ];
restartTriggers = [ configFile ];
# https://github.com/Zuplu/postfix-tlspol/blob/main/init/postfix-tlspol.service
serviceConfig = {
ExecStart = toString [
(lib.getExe cfg.package)
"-config"
"/etc/postfix-tlspol/config.yaml"
];
ExecReload = "${lib.getExe' pkgs.util-linux "kill"} -HUP $MAINPID";
Restart = "always";
RestartSec = 5;
User = "postfix-tlspol";
Group = "postfix-tlspol";
CacheDirectory = "postfix-tlspol";
CapabilityBoundingSet = [ "" ];
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateTmp = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
ReadOnlyPaths = [ "/etc/postfix-tlspol/config.yaml" ];
RemoveIPC = true;
RestrictAddressFamilies = [
"AF_INET"
"AF_INET6"
];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [
"@system-service"
"~@privileged @resources"
];
SystemCallErrorNumber = "EPERM";
SecureBits = [
"noroot"
"noroot-locked"
];
RuntimeDirectory = "postfix-tlspol";
RuntimeDirectoryMode = "1750";
WorkingDirectory = "/var/cache/postfix-tlspol";
UMask = "0077";
};
};
})
];
}
|
