nixpkgs/nixos/modules/security/acme.nix

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{ config, lib, pkgs, ... }:
with lib;
let
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cfg = config.security.acme;
certOpts = { ... }: {
options = {
webroot = mkOption {
type = types.str;
description = ''
Where the webroot of the HTTP vhost is located.
<filename>.well-known/acme-challenge/</filename> directory
will be created automatically if it doesn't exist.
<literal>http://example.org/.well-known/acme-challenge/</literal> must also
be available (notice unencrypted HTTP).
'';
};
email = mkOption {
type = types.nullOr types.str;
default = null;
description = "Contact email address for the CA to be able to reach you.";
};
user = mkOption {
type = types.str;
default = "root";
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description = "User running the ACME client.";
};
group = mkOption {
type = types.str;
default = "root";
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description = "Group running the ACME client.";
};
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allowKeysForGroup = mkOption {
type = types.bool;
default = false;
description = "Give read permissions to the specified group to read SSL private certificates.";
};
postRun = mkOption {
type = types.lines;
default = "";
example = "systemctl reload nginx.service";
description = ''
Commands to run after certificates are re-issued. Typically
the web server and other servers using certificates need to
be reloaded.
'';
};
plugins = mkOption {
type = types.listOf (types.enum [
"cert.der" "cert.pem" "chain.pem" "external.sh"
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"fullchain.pem" "full.pem" "key.der" "key.pem" "account_key.json"
]);
default = [ "fullchain.pem" "key.pem" "account_key.json" ];
description = ''
Plugins to enable. With default settings simp_le will
store public certificate bundle in <filename>fullchain.pem</filename>
and private key in <filename>key.pem</filename> in its state directory.
'';
};
extraDomains = mkOption {
type = types.attrsOf (types.nullOr types.str);
default = {};
example = {
"example.org" = "/srv/http/nginx";
"mydomain.org" = null;
};
description = ''
Extra domain names for which certificates are to be issued, with their
own server roots if needed.
'';
};
};
};
in
{
###### interface
options = {
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security.acme = {
directory = mkOption {
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default = "/var/lib/acme";
type = types.str;
description = ''
Directory where certs and other state will be stored by default.
'';
};
validMin = mkOption {
type = types.int;
default = 30 * 24 * 3600;
description = "Minimum remaining validity before renewal in seconds.";
};
renewInterval = mkOption {
type = types.str;
default = "weekly";
description = ''
Systemd calendar expression when to check for renewal. See
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>.
'';
};
preliminarySelfsigned = mkOption {
type = types.bool;
default = true;
description = ''
Whether a preliminary self-signed certificate should be generated before
doing ACME requests. This can be useful when certificates are required in
a webserver, but ACME needs the webserver to make its requests.
With preliminary self-signed certificate the webserver can be started and
can later reload the correct ACME certificates.
'';
};
certs = mkOption {
default = { };
type = with types; attrsOf (submodule certOpts);
description = ''
Attribute set of certificates to get signed and renewed.
'';
example = {
"example.com" = {
webroot = "/var/www/challenges/";
email = "foo@example.com";
extraDomains = { "www.example.com" = null; "foo.example.com" = "/var/www/foo/"; };
};
"bar.example.com" = {
webroot = "/var/www/challenges/";
email = "bar@example.com";
};
};
};
};
};
###### implementation
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config = mkMerge [
(mkIf (cfg.certs != { }) {
systemd.services = let
services = concatLists servicesLists;
servicesLists = mapAttrsToList certToServices cfg.certs;
certToServices = cert: data:
let
cpath = "${cfg.directory}/${cert}";
rights = if data.allowKeysForGroup then "750" else "700";
cmdline = [ "-v" "-d" cert "--default_root" data.webroot "--valid_min" cfg.validMin ]
++ optionals (data.email != null) [ "--email" data.email ]
++ concatMap (p: [ "-f" p ]) data.plugins
++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains);
acmeService = {
description = "Renew ACME Certificate for ${cert}";
after = [ "network.target" "network-online.target" ];
wants = [ "network-online.target" ];
serviceConfig = {
Type = "oneshot";
SuccessExitStatus = [ "0" "1" ];
PermissionsStartOnly = true;
User = data.user;
Group = data.group;
PrivateTmp = true;
};
path = [ pkgs.simp_le ];
preStart = ''
mkdir -p '${cfg.directory}'
chown '${data.user}:${data.group}' '${cfg.directory}'
if [ ! -d '${cpath}' ]; then
mkdir '${cpath}'
fi
chmod ${rights} '${cpath}'
chown -R '${data.user}:${data.group}' '${cpath}'
'';
script = ''
cd '${cpath}'
set +e
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simp_le ${escapeShellArgs cmdline}
EXITCODE=$?
set -e
echo "$EXITCODE" > /tmp/lastExitCode
exit "$EXITCODE"
'';
postStop = ''
if [ -e /tmp/lastExitCode ] && [ "$(cat /tmp/lastExitCode)" = "0" ]; then
echo "Executing postRun hook..."
${data.postRun}
fi
'';
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before = [ "acme-certificates.target" ];
wantedBy = [ "acme-certificates.target" ];
};
selfsignedService = {
description = "Create preliminary self-signed certificate for ${cert}";
preStart = ''
if [ ! -d '${cpath}' ]
then
mkdir -p '${cpath}'
chmod ${rights} '${cpath}'
chown '${data.user}:${data.group}' '${cpath}'
fi
'';
script =
''
# Create self-signed key
workdir="/run/acme-selfsigned-${cert}"
${pkgs.openssl.bin}/bin/openssl genrsa -des3 -passout pass:x -out $workdir/server.pass.key 2048
${pkgs.openssl.bin}/bin/openssl rsa -passin pass:x -in $workdir/server.pass.key -out $workdir/server.key
${pkgs.openssl.bin}/bin/openssl req -new -key $workdir/server.key -out $workdir/server.csr \
-subj "/C=UK/ST=Warwickshire/L=Leamington/O=OrgName/OU=IT Department/CN=example.com"
${pkgs.openssl.bin}/bin/openssl x509 -req -days 1 -in $workdir/server.csr -signkey $workdir/server.key -out $workdir/server.crt
# Move key to destination
mv $workdir/server.key ${cpath}/key.pem
mv $workdir/server.crt ${cpath}/fullchain.pem
# Clean up working directory
rm $workdir/server.csr
rm $workdir/server.pass.key
# Give key acme permissions
chmod ${rights} '${cpath}/key.pem'
chown '${data.user}:${data.group}' '${cpath}/key.pem'
chmod ${rights} '${cpath}/fullchain.pem'
chown '${data.user}:${data.group}' '${cpath}/fullchain.pem'
'';
serviceConfig = {
Type = "oneshot";
RuntimeDirectory = "acme-selfsigned-${cert}";
PermissionsStartOnly = true;
User = data.user;
Group = data.group;
};
unitConfig = {
# Do not create self-signed key when key already exists
ConditionPathExists = "!${cpath}/key.pem";
};
before = [
"acme-selfsigned-certificates.target"
];
wantedBy = [
"acme-selfsigned-certificates.target"
];
};
in (
[ { name = "acme-${cert}"; value = acmeService; } ]
++
(if cfg.preliminarySelfsigned
then [ { name = "acme-selfsigned-${cert}"; value = selfsignedService; } ]
else []
)
);
servicesAttr = listToAttrs services;
nginxAttr = {
nginx = {
after = [ "acme-selfsigned-certificates.target" ];
wants = [ "acme-selfsigned-certificates.target" "acme-certificates.target" ];
};
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};
in
servicesAttr //
(if config.services.nginx.enable then nginxAttr else {});
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systemd.timers = flip mapAttrs' cfg.certs (cert: data: nameValuePair
("acme-${cert}")
({
description = "Renew ACME Certificate for ${cert}";
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wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = cfg.renewInterval;
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Unit = "acme-${cert}.service";
Persistent = "yes";
AccuracySec = "5m";
RandomizedDelaySec = "1h";
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};
})
);
systemd.targets."acme-selfsigned-certificates" = mkIf cfg.preliminarySelfsigned {};
systemd.targets."acme-certificates" = {};
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})
];
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meta = {
maintainers = with lib.maintainers; [ abbradar fpletz globin ];
doc = ./acme.xml;
};
}