477 lines
19 KiB
Nix
477 lines
19 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
with lib;
|
|
let
|
|
|
|
cfg = config.security.acme;
|
|
|
|
certOpts = { name, ... }: {
|
|
options = {
|
|
webroot = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
example = "/var/lib/acme/acme-challenges";
|
|
description = ''
|
|
Where the webroot of the HTTP vhost is located.
|
|
<filename>.well-known/acme-challenge/</filename> directory
|
|
will be created below the webroot if it doesn't exist.
|
|
<literal>http://example.org/.well-known/acme-challenge/</literal> must also
|
|
be available (notice unencrypted HTTP).
|
|
'';
|
|
};
|
|
|
|
server = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
description = ''
|
|
ACME Directory Resource URI. Defaults to let's encrypt
|
|
production endpoint,
|
|
https://acme-v02.api.letsencrypt.org/directory, if unset.
|
|
'';
|
|
};
|
|
|
|
domain = mkOption {
|
|
type = types.str;
|
|
default = name;
|
|
description = "Domain to fetch certificate for (defaults to the entry name)";
|
|
};
|
|
|
|
email = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = cfg.email;
|
|
description = "Contact email address for the CA to be able to reach you.";
|
|
};
|
|
|
|
user = mkOption {
|
|
type = types.str;
|
|
default = "root";
|
|
description = "User running the ACME client.";
|
|
};
|
|
|
|
group = mkOption {
|
|
type = types.str;
|
|
default = "root";
|
|
description = "Group running the ACME client.";
|
|
};
|
|
|
|
allowKeysForGroup = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Give read permissions to the specified group
|
|
(<option>security.acme.cert.<name>.group</option>) to read SSL private certificates.
|
|
'';
|
|
};
|
|
|
|
postRun = mkOption {
|
|
type = types.lines;
|
|
default = "";
|
|
example = "systemctl reload nginx.service";
|
|
description = ''
|
|
Commands to run after new certificates go live. Typically
|
|
the web server and other servers using certificates need to
|
|
be reloaded.
|
|
|
|
Executed in the same directory with the new certificate.
|
|
'';
|
|
};
|
|
|
|
directory = mkOption {
|
|
type = types.str;
|
|
readOnly = true;
|
|
default = "/var/lib/acme/${name}";
|
|
description = "Directory where certificate and other state is stored.";
|
|
};
|
|
|
|
extraDomains = mkOption {
|
|
type = types.attrsOf (types.nullOr types.str);
|
|
default = {};
|
|
example = literalExample ''
|
|
{
|
|
"example.org" = null;
|
|
"mydomain.org" = null;
|
|
}
|
|
'';
|
|
description = ''
|
|
A list of extra domain names, which are included in the one certificate to be issued.
|
|
Setting a distinct server root is deprecated and not functional in 20.03+
|
|
'';
|
|
};
|
|
|
|
keyType = mkOption {
|
|
type = types.str;
|
|
default = "ec256";
|
|
description = ''
|
|
Key type to use for private keys.
|
|
For an up to date list of supported values check the --key-type option
|
|
at https://go-acme.github.io/lego/usage/cli/#usage.
|
|
'';
|
|
};
|
|
|
|
dnsProvider = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
example = "route53";
|
|
description = ''
|
|
DNS Challenge provider. For a list of supported providers, see the "code"
|
|
field of the DNS providers listed at https://go-acme.github.io/lego/dns/.
|
|
'';
|
|
};
|
|
|
|
credentialsFile = mkOption {
|
|
type = types.path;
|
|
description = ''
|
|
Path to an EnvironmentFile for the cert's service containing any required and
|
|
optional environment variables for your selected dnsProvider.
|
|
To find out what values you need to set, consult the documentation at
|
|
https://go-acme.github.io/lego/dns/ for the corresponding dnsProvider.
|
|
'';
|
|
example = "/var/src/secrets/example.org-route53-api-token";
|
|
};
|
|
|
|
dnsPropagationCheck = mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = ''
|
|
Toggles lego DNS propagation check, which is used alongside DNS-01
|
|
challenge to ensure the DNS entries required are available.
|
|
'';
|
|
};
|
|
|
|
ocspMustStaple = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Turns on the OCSP Must-Staple TLS extension.
|
|
Make sure you know what you're doing! See:
|
|
<itemizedlist>
|
|
<listitem><para><link xlink:href="https://blog.apnic.net/2019/01/15/is-the-web-ready-for-ocsp-must-staple/" /></para></listitem>
|
|
<listitem><para><link xlink:href="https://blog.hboeck.de/archives/886-The-Problem-with-OCSP-Stapling-and-Must-Staple-and-why-Certificate-Revocation-is-still-broken.html" /></para></listitem>
|
|
</itemizedlist>
|
|
'';
|
|
};
|
|
|
|
extraLegoRenewFlags = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
description = ''
|
|
Additional flags to pass to lego renew.
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
|
|
in
|
|
|
|
{
|
|
|
|
###### interface
|
|
imports = [
|
|
(mkRemovedOptionModule [ "security" "acme" "production" ] ''
|
|
Use security.acme.server to define your staging ACME server URL instead.
|
|
|
|
To use the let's encrypt staging server, use security.acme.server =
|
|
"https://acme-staging-v02.api.letsencrypt.org/directory".
|
|
''
|
|
)
|
|
(mkRemovedOptionModule [ "security" "acme" "directory"] "ACME Directory is now hardcoded to /var/lib/acme and its permisisons are managed by systemd. See https://github.com/NixOS/nixpkgs/issues/53852 for more info.")
|
|
(mkRemovedOptionModule [ "security" "acme" "preDelay"] "This option has been removed. If you want to make sure that something executes before certificates are provisioned, add a RequiredBy=acme-\${cert}.service to the service you want to execute before the cert renewal")
|
|
(mkRemovedOptionModule [ "security" "acme" "activationDelay"] "This option has been removed. If you want to make sure that something executes before certificates are provisioned, add a RequiredBy=acme-\${cert}.service to the service you want to execute before the cert renewal")
|
|
(mkChangedOptionModule [ "security" "acme" "validMin"] [ "security" "acme" "validMinDays"] (config: config.security.acme.validMin / (24 * 3600)))
|
|
];
|
|
options = {
|
|
security.acme = {
|
|
|
|
validMinDays = mkOption {
|
|
type = types.int;
|
|
default = 30;
|
|
description = "Minimum remaining validity before renewal in days.";
|
|
};
|
|
|
|
email = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
description = "Contact email address for the CA to be able to reach you.";
|
|
};
|
|
|
|
renewInterval = mkOption {
|
|
type = types.str;
|
|
default = "daily";
|
|
description = ''
|
|
Systemd calendar expression when to check for renewal. See
|
|
<citerefentry><refentrytitle>systemd.time</refentrytitle>
|
|
<manvolnum>7</manvolnum></citerefentry>.
|
|
'';
|
|
};
|
|
|
|
server = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
description = ''
|
|
ACME Directory Resource URI. Defaults to let's encrypt
|
|
production endpoint,
|
|
<literal>https://acme-v02.api.letsencrypt.org/directory</literal>, if unset.
|
|
'';
|
|
};
|
|
|
|
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.
|
|
'';
|
|
};
|
|
|
|
acceptTerms = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Accept the CA's terms of service. The default provier is Let's Encrypt,
|
|
you can find their ToS at https://letsencrypt.org/repository/
|
|
'';
|
|
};
|
|
|
|
certs = mkOption {
|
|
default = { };
|
|
type = with types; attrsOf (submodule certOpts);
|
|
description = ''
|
|
Attribute set of certificates to get signed and renewed. Creates
|
|
<literal>acme-''${cert}.{service,timer}</literal> systemd units for
|
|
each certificate defined here. Other services can add dependencies
|
|
to those units if they rely on the certificates being present,
|
|
or trigger restarts of the service if certificates get renewed.
|
|
'';
|
|
example = literalExample ''
|
|
{
|
|
"example.com" = {
|
|
webroot = "/var/www/challenges/";
|
|
email = "foo@example.com";
|
|
extraDomains = { "www.example.com" = null; "foo.example.com" = null; };
|
|
};
|
|
"bar.example.com" = {
|
|
webroot = "/var/www/challenges/";
|
|
email = "bar@example.com";
|
|
};
|
|
}
|
|
'';
|
|
};
|
|
};
|
|
};
|
|
|
|
###### implementation
|
|
config = mkMerge [
|
|
(mkIf (cfg.certs != { }) {
|
|
|
|
assertions = let
|
|
certs = (mapAttrsToList (k: v: v) cfg.certs);
|
|
in [
|
|
{
|
|
assertion = all (certOpts: certOpts.dnsProvider == null || certOpts.webroot == null) certs;
|
|
message = ''
|
|
Options `security.acme.certs.<name>.dnsProvider` and
|
|
`security.acme.certs.<name>.webroot` are mutually exclusive.
|
|
'';
|
|
}
|
|
{
|
|
assertion = cfg.email != null || all (certOpts: certOpts.email != null) certs;
|
|
message = ''
|
|
You must define `security.acme.certs.<name>.email` or
|
|
`security.acme.email` to register with the CA.
|
|
'';
|
|
}
|
|
{
|
|
assertion = cfg.acceptTerms;
|
|
message = ''
|
|
You must accept the CA's terms of service before using
|
|
the ACME module by setting `security.acme.acceptTerms`
|
|
to `true`. For Let's Encrypt's ToS see https://letsencrypt.org/repository/
|
|
'';
|
|
}
|
|
];
|
|
|
|
systemd.services = let
|
|
services = concatLists servicesLists;
|
|
servicesLists = mapAttrsToList certToServices cfg.certs;
|
|
certToServices = cert: data:
|
|
let
|
|
# StateDirectory must be relative, and will be created under /var/lib by systemd
|
|
lpath = "acme/${cert}";
|
|
apath = "/var/lib/${lpath}";
|
|
spath = "/var/lib/acme/.lego/${cert}";
|
|
keyName = builtins.replaceStrings ["*"] ["_"] data.domain;
|
|
requestedDomains = pipe ([ data.domain ] ++ (attrNames data.extraDomains)) [
|
|
(domains: sort builtins.lessThan domains)
|
|
(domains: concatStringsSep "," domains)
|
|
];
|
|
fileMode = if data.allowKeysForGroup then "640" else "600";
|
|
globalOpts = [ "-d" data.domain "--email" data.email "--path" "." "--key-type" data.keyType ]
|
|
++ optionals (cfg.acceptTerms) [ "--accept-tos" ]
|
|
++ optionals (data.dnsProvider != null && !data.dnsPropagationCheck) [ "--dns.disable-cp" ]
|
|
++ concatLists (mapAttrsToList (name: root: [ "-d" name ]) data.extraDomains)
|
|
++ (if data.dnsProvider != null then [ "--dns" data.dnsProvider ] else [ "--http" "--http.webroot" data.webroot ])
|
|
++ optionals (cfg.server != null || data.server != null) ["--server" (if data.server == null then cfg.server else data.server)];
|
|
certOpts = optionals data.ocspMustStaple [ "--must-staple" ];
|
|
runOpts = escapeShellArgs (globalOpts ++ [ "run" ] ++ certOpts);
|
|
renewOpts = escapeShellArgs (globalOpts ++
|
|
[ "renew" "--days" (toString cfg.validMinDays) ] ++
|
|
certOpts ++ data.extraLegoRenewFlags);
|
|
acmeService = {
|
|
description = "Renew ACME Certificate for ${cert}";
|
|
path = with pkgs; [ openssl ];
|
|
after = [ "network.target" "network-online.target" ];
|
|
wants = [ "network-online.target" ];
|
|
wantedBy = mkIf (!config.boot.isContainer) [ "multi-user.target" ];
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
User = data.user;
|
|
Group = data.group;
|
|
PrivateTmp = true;
|
|
StateDirectory = "acme/.lego/${cert} acme/.lego/accounts ${lpath}";
|
|
StateDirectoryMode = if data.allowKeysForGroup then "750" else "700";
|
|
WorkingDirectory = spath;
|
|
# Only try loading the credentialsFile if the dns challenge is enabled
|
|
EnvironmentFile = if data.dnsProvider != null then data.credentialsFile else null;
|
|
ExecStart = pkgs.writeScript "acme-start" ''
|
|
#!${pkgs.runtimeShell} -e
|
|
test -L ${spath}/accounts -o -d ${spath}/accounts || ln -s ../accounts ${spath}/accounts
|
|
LEGO_ARGS=(${runOpts})
|
|
if [ -e ${spath}/certificates/${keyName}.crt ]; then
|
|
REQUESTED_DOMAINS="${requestedDomains}"
|
|
EXISTING_DOMAINS="$(openssl x509 -in ${spath}/certificates/${keyName}.crt -noout -ext subjectAltName | tail -n1 | sed -e 's/ *DNS://g')"
|
|
if [ "''${REQUESTED_DOMAINS}" == "''${EXISTING_DOMAINS}" ]; then
|
|
LEGO_ARGS=(${renewOpts})
|
|
fi
|
|
fi
|
|
${pkgs.lego}/bin/lego ''${LEGO_ARGS[@]}
|
|
'';
|
|
ExecStartPost =
|
|
let
|
|
script = pkgs.writeScript "acme-post-start" ''
|
|
#!${pkgs.runtimeShell} -e
|
|
cd ${apath}
|
|
|
|
# Test that existing cert is older than new cert
|
|
KEY=${spath}/certificates/${keyName}.key
|
|
KEY_CHANGED=no
|
|
if [ -e $KEY -a $KEY -nt key.pem ]; then
|
|
KEY_CHANGED=yes
|
|
cp -p ${spath}/certificates/${keyName}.key key.pem
|
|
cp -p ${spath}/certificates/${keyName}.crt fullchain.pem
|
|
cp -p ${spath}/certificates/${keyName}.issuer.crt chain.pem
|
|
ln -sf fullchain.pem cert.pem
|
|
cat key.pem fullchain.pem > full.pem
|
|
fi
|
|
|
|
chmod ${fileMode} *.pem
|
|
chown '${data.user}:${data.group}' *.pem
|
|
|
|
if [ "$KEY_CHANGED" = "yes" ]; then
|
|
: # noop in case postRun is empty
|
|
${data.postRun}
|
|
fi
|
|
'';
|
|
in
|
|
"+${script}";
|
|
};
|
|
|
|
};
|
|
selfsignedService = {
|
|
description = "Create preliminary self-signed certificate for ${cert}";
|
|
path = [ pkgs.openssl ];
|
|
script =
|
|
''
|
|
workdir="$(mktemp -d)"
|
|
|
|
# Create CA
|
|
openssl genrsa -des3 -passout pass:xxxx -out $workdir/ca.pass.key 2048
|
|
openssl rsa -passin pass:xxxx -in $workdir/ca.pass.key -out $workdir/ca.key
|
|
openssl req -new -key $workdir/ca.key -out $workdir/ca.csr \
|
|
-subj "/C=UK/ST=Warwickshire/L=Leamington/O=OrgName/OU=Security Department/CN=example.com"
|
|
openssl x509 -req -days 1 -in $workdir/ca.csr -signkey $workdir/ca.key -out $workdir/ca.crt
|
|
|
|
# Create key
|
|
openssl genrsa -des3 -passout pass:xxxx -out $workdir/server.pass.key 2048
|
|
openssl rsa -passin pass:xxxx -in $workdir/server.pass.key -out $workdir/server.key
|
|
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"
|
|
openssl x509 -req -days 1 -in $workdir/server.csr -CA $workdir/ca.crt \
|
|
-CAkey $workdir/ca.key -CAserial $workdir/ca.srl -CAcreateserial \
|
|
-out $workdir/server.crt
|
|
|
|
# Copy key to destination
|
|
cp $workdir/server.key ${apath}/key.pem
|
|
|
|
# Create fullchain.pem (same format as "simp_le ... -f fullchain.pem" creates)
|
|
cat $workdir/{server.crt,ca.crt} > "${apath}/fullchain.pem"
|
|
|
|
# Create full.pem for e.g. lighttpd
|
|
cat $workdir/{server.key,server.crt,ca.crt} > "${apath}/full.pem"
|
|
|
|
# Give key acme permissions
|
|
chown '${data.user}:${data.group}' "${apath}/"{key,fullchain,full}.pem
|
|
chmod ${fileMode} "${apath}/"{key,fullchain,full}.pem
|
|
'';
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
PrivateTmp = true;
|
|
StateDirectory = lpath;
|
|
User = data.user;
|
|
Group = data.group;
|
|
};
|
|
unitConfig = {
|
|
# Do not create self-signed key when key already exists
|
|
ConditionPathExists = "!${apath}/key.pem";
|
|
};
|
|
};
|
|
in (
|
|
[ { name = "acme-${cert}"; value = acmeService; } ]
|
|
++ optional cfg.preliminarySelfsigned { name = "acme-selfsigned-${cert}"; value = selfsignedService; }
|
|
);
|
|
servicesAttr = listToAttrs services;
|
|
in
|
|
servicesAttr;
|
|
|
|
systemd.tmpfiles.rules =
|
|
map (data: "d ${data.webroot}/.well-known/acme-challenge - ${data.user} ${data.group}") (filter (data: data.webroot != null) (attrValues cfg.certs));
|
|
|
|
systemd.timers = let
|
|
# Allow systemd to pick a convenient time within the day
|
|
# to run the check.
|
|
# This allows the coalescing of multiple timer jobs.
|
|
# We divide by the number of certificates so that if you
|
|
# have many certificates, the renewals are distributed over
|
|
# the course of the day to avoid rate limits.
|
|
numCerts = length (attrNames cfg.certs);
|
|
_24hSecs = 60 * 60 * 24;
|
|
AccuracySec = "${toString (_24hSecs / numCerts)}s";
|
|
in flip mapAttrs' cfg.certs (cert: data: nameValuePair
|
|
("acme-${cert}")
|
|
({
|
|
description = "Renew ACME Certificate for ${cert}";
|
|
wantedBy = [ "timers.target" ];
|
|
timerConfig = {
|
|
OnCalendar = cfg.renewInterval;
|
|
Unit = "acme-${cert}.service";
|
|
Persistent = "yes";
|
|
inherit AccuracySec;
|
|
# Skew randomly within the day, per https://letsencrypt.org/docs/integration-guide/.
|
|
RandomizedDelaySec = "24h";
|
|
};
|
|
})
|
|
);
|
|
|
|
systemd.targets.acme-selfsigned-certificates = mkIf cfg.preliminarySelfsigned {};
|
|
systemd.targets.acme-certificates = {};
|
|
})
|
|
|
|
];
|
|
|
|
meta = {
|
|
maintainers = lib.teams.acme.members;
|
|
doc = ./acme.xml;
|
|
};
|
|
}
|