nixpkgs/nixos/modules/services/networking/stunnel.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.stunnel;
yesNo = val: if val then "yes" else "no";
verifyChainPathAssert = n: c: {
assertion = c.verifyHostname == null || (c.verifyChain || c.verifyPeer);
message = "stunnel: \"${n}\" client configuration - hostname verification " +
"is not possible without either verifyChain or verifyPeer enabled";
};
serverConfig = {
options = {
accept = mkOption {
type = types.int;
description = "On which port stunnel should listen for incoming TLS connections.";
};
connect = mkOption {
type = types.int;
description = "To which port the decrypted connection should be forwarded.";
};
cert = mkOption {
type = types.path;
description = "File containing both the private and public keys.";
};
};
};
clientConfig = {
options = {
accept = mkOption {
type = types.str;
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description = "IP:Port on which connections should be accepted.";
};
connect = mkOption {
type = types.str;
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description = "IP:Port destination to connect to.";
};
verifyChain = mkOption {
type = types.bool;
default = true;
description = "Check if the provided certificate has a valid certificate chain (against CAPath).";
};
verifyPeer = mkOption {
type = types.bool;
default = false;
description = "Check if the provided certificate is contained in CAPath.";
};
CAPath = mkOption {
type = types.path;
default = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
description = "Path to a file containing certificates to validate against.";
};
verifyHostname = mkOption {
type = with types; nullOr str;
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default = null;
description = "If set, stunnel checks if the provided certificate is valid for the given hostname.";
};
};
};
in
{
###### interface
options = {
services.stunnel = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable the stunnel TLS tunneling service.";
};
user = mkOption {
type = with types; nullOr str;
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default = "nobody";
description = "The user under which stunnel runs.";
};
group = mkOption {
type = with types; nullOr str;
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default = "nogroup";
description = "The group under which stunnel runs.";
};
logLevel = mkOption {
type = types.enum [ "emerg" "alert" "crit" "err" "warning" "notice" "info" "debug" ];
default = "info";
description = "Verbosity of stunnel output.";
};
fipsMode = mkOption {
type = types.bool;
default = false;
description = "Enable FIPS 140-2 mode required for compliance.";
};
enableInsecureSSLv3 = mkOption {
type = types.bool;
default = false;
description = "Enable support for the insecure SSLv3 protocol.";
};
servers = mkOption {
description = "Define the server configuations.";
type = with types; attrsOf (submodule serverConfig);
example = {
fancyWebserver = {
enable = true;
accept = 443;
connect = 8080;
cert = "/path/to/pem/file";
};
};
default = { };
};
clients = mkOption {
description = "Define the client configurations.";
type = with types; attrsOf (submodule clientConfig);
example = {
foobar = {
accept = "0.0.0.0:8080";
connect = "nixos.org:443";
verifyChain = false;
};
};
default = { };
};
};
};
###### implementation
config = mkIf cfg.enable {
assertions = concatLists [
(singleton {
assertion = (length (attrValues cfg.servers) != 0) || ((length (attrValues cfg.clients)) != 0);
message = "stunnel: At least one server- or client-configuration has to be present.";
})
(mapAttrsToList verifyChainPathAssert cfg.clients)
];
environment.systemPackages = [ pkgs.stunnel ];
environment.etc."stunnel.cfg".text = ''
${ if cfg.user != null then "setuid = ${cfg.user}" else "" }
${ if cfg.group != null then "setgid = ${cfg.group}" else "" }
debug = ${cfg.logLevel}
${ optionalString cfg.fipsMode "fips = yes" }
${ optionalString cfg.enableInsecureSSLv3 "options = -NO_SSLv3" }
; ----- SERVER CONFIGURATIONS -----
${ lib.concatStringsSep "\n"
(lib.mapAttrsToList
(n: v: ''
[${n}]
accept = ${toString v.accept}
connect = ${toString v.connect}
cert = ${v.cert}
'')
cfg.servers)
}
; ----- CLIENT CONFIGURATIONS -----
${ lib.concatStringsSep "\n"
(lib.mapAttrsToList
(n: v: ''
[${n}]
client = yes
accept = ${v.accept}
connect = ${v.connect}
verifyChain = ${yesNo v.verifyChain}
verifyPeer = ${yesNo v.verifyPeer}
${optionalString (v.CAPath != null) "CApath = ${v.CAPath}"}
${optionalString (v.verifyHostname != null) "checkHost = ${v.verifyHostname}"}
OCSPaia = yes
'')
cfg.clients)
}
'';
systemd.services.stunnel = {
description = "stunnel TLS tunneling service";
after = [ "network.target" ];
wants = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
restartTriggers = [ config.environment.etc."stunnel.cfg".source ];
serviceConfig = {
ExecStart = "${pkgs.stunnel}/bin/stunnel ${config.environment.etc."stunnel.cfg".source}";
Type = "forking";
};
};
};
}