Merge pull request #77578 from m1cr0man/master
Replace simp-le with lego and support DNS-01 challenge
This commit is contained in:
Florian Klink
GitHub
commit
4e0fea3fe2
@ -4304,6 +4304,12 @@
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email = "wheatdoge@gmail.com";
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name = "Tim Liou";
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};
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m1cr0man = {
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email = "lucas+nix@m1cr0man.com";
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github = "m1cr0man";
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githubId = 3044438;
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name = "Lucas Savva";
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};
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m3tti = {
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email = "mathaeus.peter.sander@gmail.com";
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name = "Mathaeus Sander";
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@ -660,6 +660,21 @@ auth required pam_succeed_if.so uid >= 1000 quiet
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<literal>PRETTY_NAME</literal> in <literal>/etc/os-release</literal>
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now uses the short rather than full version string.
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</para>
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</listitem>
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<listitem>
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<para>
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The ACME module has switched from simp-le to <link xlink:href="https://github.com/go-acme/lego">lego</link>
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which allows us to support DNS-01 challenges and wildcard certificates. The following options have been added:
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<link linkend="opt-security.acme.acceptTerms">security.acme.acceptTerms</link>,
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<link linkend="opt-security.acme.certs">security.acme.certs.<name>.dnsProvider</link>,
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<link linkend="opt-security.acme.certs">security.acme.certs.<name>.credentialsFile</link>,
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<link linkend="opt-security.acme.certs">security.acme.certs.<name>.dnsPropagationCheck</link>.
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As well as this, the options <literal>security.acme.acceptTerms</literal> and either
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<literal>security.acme.email</literal> or <literal>security.acme.certs.<name>.email</literal>
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must be set in order to use the ACME module.
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Certificates will be regenerated anew on the next renewal date. The credentials for simp-le are
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preserved and thus it is possible to roll back to previous versions without breaking certificate
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generation.
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</listitem>
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<listitem>
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<para>
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@ -1,7 +1,5 @@
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.security.acme;
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@ -9,7 +7,8 @@ let
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certOpts = { name, ... }: {
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options = {
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webroot = mkOption {
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type = types.str;
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type = types.nullOr types.str;
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default = null;
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example = "/var/lib/acme/acme-challenges";
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description = ''
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Where the webroot of the HTTP vhost is located.
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@ -38,7 +37,7 @@ let
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email = mkOption {
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type = types.nullOr types.str;
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default = null;
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default = cfg.email;
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description = "Contact email address for the CA to be able to reach you.";
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};
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@ -76,20 +75,6 @@ let
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'';
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};
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plugins = mkOption {
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type = types.listOf (types.enum [
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"cert.der" "cert.pem" "chain.pem" "external.sh"
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"fullchain.pem" "full.pem" "key.der" "key.pem" "account_key.json" "account_reg.json"
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]);
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default = [ "fullchain.pem" "full.pem" "key.pem" "account_key.json" "account_reg.json" ];
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description = ''
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Plugins to enable. With default settings simp_le will
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store public certificate bundle in <filename>fullchain.pem</filename>,
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private key in <filename>key.pem</filename> and those two previous
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files combined in <filename>full.pem</filename> in its state directory.
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'';
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};
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directory = mkOption {
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type = types.str;
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readOnly = true;
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@ -111,6 +96,46 @@ let
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own server roots if needed.
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'';
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};
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keyType = mkOption {
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type = types.str;
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default = "ec384";
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description = ''
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Key type to use for private keys.
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For an up to date list of supported values check the --key-type option
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at https://go-acme.github.io/lego/usage/cli/#usage.
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'';
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};
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dnsProvider = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "route53";
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description = ''
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DNS Challenge provider. For a list of supported providers, see the "code"
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field of the DNS providers listed at https://go-acme.github.io/lego/dns/.
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'';
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};
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credentialsFile = mkOption {
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type = types.path;
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description = ''
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Path to an EnvironmentFile for the cert's service containing any required and
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optional environment variables for your selected dnsProvider.
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To find out what values you need to set, consult the documentation at
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https://go-acme.github.io/lego/dns/ for the corresponding dnsProvider.
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'';
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example = "/var/src/secrets/example.org-route53-api-token";
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};
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dnsPropagationCheck = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Toggles lego DNS propagation check, which is used alongside DNS-01
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challenge to ensure the DNS entries required are available.
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'';
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};
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};
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};
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@ -130,14 +155,21 @@ in
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(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.")
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(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")
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(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")
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(mkChangedOptionModule [ "security" "acme" "validMin"] [ "security" "acme" "validMinDays"] (config: config.security.acme.validMin / (24 * 3600)))
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];
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options = {
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security.acme = {
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validMin = mkOption {
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validMinDays = mkOption {
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type = types.int;
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default = 30 * 24 * 3600;
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description = "Minimum remaining validity before renewal in seconds.";
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default = 30;
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description = "Minimum remaining validity before renewal in days.";
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};
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email = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Contact email address for the CA to be able to reach you.";
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};
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renewInterval = mkOption {
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@ -173,6 +205,15 @@ in
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'';
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};
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acceptTerms = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Accept the CA's terms of service. The default provier is Let's Encrypt,
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you can find their ToS at https://letsencrypt.org/repository/
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'';
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};
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certs = mkOption {
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default = { };
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type = with types; attrsOf (submodule certOpts);
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@ -204,27 +245,55 @@ in
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config = mkMerge [
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(mkIf (cfg.certs != { }) {
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assertions = let
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certs = (mapAttrsToList (k: v: v) cfg.certs);
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in [
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{
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assertion = all (certOpts: certOpts.dnsProvider == null || certOpts.webroot == null) certs;
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message = ''
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Options `security.acme.certs.<name>.dnsProvider` and
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`security.acme.certs.<name>.webroot` are mutually exclusive.
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'';
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}
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{
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assertion = cfg.email != null || all (certOpts: certOpts.email != null) certs;
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message = ''
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You must define `security.acme.certs.<name>.email` or
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`security.acme.email` to register with the CA.
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'';
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}
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{
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assertion = cfg.acceptTerms;
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message = ''
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You must accept the CA's terms of service before using
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the ACME module by setting `security.acme.acceptTerms`
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to `true`. For Let's Encrypt's ToS see https://letsencrypt.org/repository/
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'';
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}
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];
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systemd.services = let
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services = concatLists servicesLists;
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servicesLists = mapAttrsToList certToServices cfg.certs;
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certToServices = cert: data:
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let
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# StateDirectory must be relative, and will be created under /var/lib by systemd
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lpath = "acme/${cert}";
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apath = "/var/lib/${lpath}";
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spath = "/var/lib/acme/.lego";
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rights = if data.allowKeysForGroup then "750" else "700";
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cmdline = [ "-v" "-d" data.domain "--default_root" data.webroot "--valid_min" cfg.validMin ]
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++ optionals (data.email != null) [ "--email" data.email ]
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++ concatMap (p: [ "-f" p ]) data.plugins
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++ concatLists (mapAttrsToList (name: root: [ "-d" (if root == null then name else "${name}:${root}")]) data.extraDomains)
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globalOpts = [ "-d" data.domain "--email" data.email "--path" "." "--key-type" data.keyType ]
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++ optionals (cfg.acceptTerms) [ "--accept-tos" ]
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++ optionals (data.dnsProvider != null && !data.dnsPropagationCheck) [ "--dns.disable-cp" ]
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++ concatLists (mapAttrsToList (name: root: [ "-d" name ]) data.extraDomains)
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++ (if data.dnsProvider != null then [ "--dns" data.dnsProvider ] else [ "--http" "--http.webroot" data.webroot ])
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++ optionals (cfg.server != null || data.server != null) ["--server" (if data.server == null then cfg.server else data.server)];
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runOpts = escapeShellArgs (globalOpts ++ [ "run" ]);
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renewOpts = escapeShellArgs (globalOpts ++ [ "renew" "--days" (toString cfg.validMinDays) ]);
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acmeService = {
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description = "Renew ACME Certificate for ${cert}";
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after = [ "network.target" "network-online.target" ];
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wants = [ "network-online.target" ];
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# simp_le uses requests, which uses certifi under the hood,
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# which doesn't respect the system trust store.
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# At least in the acme test, we provision a fake CA, impersonating the LE endpoint.
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# REQUESTS_CA_BUNDLE is a way to teach python requests to use something else
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environment.REQUESTS_CA_BUNDLE = "/etc/ssl/certs/ca-certificates.crt";
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serviceConfig = {
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Type = "oneshot";
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# With RemainAfterExit the service is considered active even
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@ -233,18 +302,37 @@ in
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# the permissions of the StateDirectory get adjusted
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# according to the specified group
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RemainAfterExit = true;
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SuccessExitStatus = [ "0" "1" ];
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User = data.user;
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Group = data.group;
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PrivateTmp = true;
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StateDirectory = lpath;
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StateDirectory = "acme/.lego ${lpath}";
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StateDirectoryMode = rights;
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WorkingDirectory = "/var/lib/${lpath}";
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ExecStart = "${pkgs.simp_le}/bin/simp_le ${escapeShellArgs cmdline}";
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WorkingDirectory = spath;
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# Only try loading the credentialsFile if the dns challenge is enabled
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EnvironmentFile = if data.dnsProvider != null then data.credentialsFile else null;
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ExecStart = pkgs.writeScript "acme-start" ''
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#!${pkgs.runtimeShell} -e
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${pkgs.lego}/bin/lego ${renewOpts} || ${pkgs.lego}/bin/lego ${runOpts}
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'';
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ExecStartPost =
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let
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keyName = builtins.replaceStrings ["*"] ["_"] data.domain;
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script = pkgs.writeScript "acme-post-start" ''
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#!${pkgs.runtimeShell} -e
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cd ${apath}
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# Test that existing cert is older than new cert
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KEY=${spath}/certificates/${keyName}.key
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if [ -e $KEY -a $KEY -nt key.pem ]; then
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cp -p ${spath}/certificates/${keyName}.key key.pem
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cp -p ${spath}/certificates/${keyName}.crt cert.pem
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cp -p ${spath}/certificates/${keyName}.issuer.crt chain.pem
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cat cert.pem chain.pem > fullchain.pem
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cat key.pem cert.pem chain.pem > full.pem
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chmod ${rights} *.pem
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chown '${data.user}:${data.group}' *.pem
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fi
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${data.postRun}
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'';
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in
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@ -276,17 +364,17 @@ in
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-out $workdir/server.crt
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# Copy key to destination
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cp $workdir/server.key /var/lib/${lpath}/key.pem
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cp $workdir/server.key ${apath}/key.pem
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# Create fullchain.pem (same format as "simp_le ... -f fullchain.pem" creates)
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cat $workdir/{server.crt,ca.crt} > "/var/lib/${lpath}/fullchain.pem"
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cat $workdir/{server.crt,ca.crt} > "${apath}/fullchain.pem"
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# Create full.pem for e.g. lighttpd
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cat $workdir/{server.key,server.crt,ca.crt} > "/var/lib/${lpath}/full.pem"
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cat $workdir/{server.key,server.crt,ca.crt} > "${apath}/full.pem"
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# Give key acme permissions
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chown '${data.user}:${data.group}' "/var/lib/${lpath}/"{key,fullchain,full}.pem
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chmod ${rights} "/var/lib/${lpath}/"{key,fullchain,full}.pem
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chown '${data.user}:${data.group}' "${apath}/"{key,fullchain,full}.pem
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chmod ${rights} "${apath}/"{key,fullchain,full}.pem
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'';
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serviceConfig = {
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Type = "oneshot";
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@ -297,7 +385,7 @@ in
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};
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unitConfig = {
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# Do not create self-signed key when key already exists
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ConditionPathExists = "!/var/lib/${lpath}/key.pem";
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ConditionPathExists = "!${apath}/key.pem";
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};
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};
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in (
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@ -309,8 +397,7 @@ in
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servicesAttr;
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systemd.tmpfiles.rules =
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flip mapAttrsToList cfg.certs
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(cert: data: "d ${data.webroot}/.well-known/acme-challenge - ${data.user} ${data.group}");
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map (data: "d ${data.webroot}/.well-known/acme-challenge - ${data.user} ${data.group}") (filter (data: data.webroot != null) (attrValues cfg.certs));
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systemd.timers = flip mapAttrs' cfg.certs (cert: data: nameValuePair
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("acme-${cert}")
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@ -334,7 +421,7 @@ in
|
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];
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|
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meta = {
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maintainers = with lib.maintainers; [ abbradar fpletz globin ];
|
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maintainers = with lib.maintainers; [ abbradar fpletz globin m1cr0man ];
|
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doc = ./acme.xml;
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};
|
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}
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|
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@ -7,7 +7,7 @@
|
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<para>
|
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NixOS supports automatic domain validation & certificate retrieval and
|
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renewal using the ACME protocol. This is currently only implemented by and
|
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for Let's Encrypt. The alternative ACME client <literal>simp_le</literal> is
|
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for Let's Encrypt. The alternative ACME client <literal>lego</literal> is
|
||||
used under the hood.
|
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</para>
|
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<section xml:id="module-security-acme-prerequisites">
|
||||
|
||||
@ -1,17 +1,50 @@
|
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let
|
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commonConfig = ./common/letsencrypt/common.nix;
|
||||
|
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dnsScript = {writeScript, dnsAddress, bash, curl}: writeScript "dns-hook.sh" ''
|
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#!${bash}/bin/bash
|
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set -euo pipefail
|
||||
echo '[INFO]' "[$2]" 'dns-hook.sh' $*
|
||||
if [ "$1" = "present" ]; then
|
||||
${curl}/bin/curl --data '{"host": "'"$2"'", "value": "'"$3"'"}' http://${dnsAddress}:8055/set-txt
|
||||
else
|
||||
${curl}/bin/curl --data '{"host": "'"$2"'"}' http://${dnsAddress}:8055/clear-txt
|
||||
fi
|
||||
'';
|
||||
|
||||
in import ./make-test-python.nix {
|
||||
name = "acme";
|
||||
|
||||
nodes = rec {
|
||||
letsencrypt = ./common/letsencrypt;
|
||||
letsencrypt = { nodes, lib, ... }: {
|
||||
imports = [ ./common/letsencrypt ];
|
||||
networking.nameservers = lib.mkForce [
|
||||
nodes.dnsserver.config.networking.primaryIPAddress
|
||||
];
|
||||
};
|
||||
|
||||
acmeStandalone = { config, pkgs, ... }: {
|
||||
dnsserver = { nodes, pkgs, ... }: {
|
||||
networking.firewall.allowedTCPPorts = [ 8055 53 ];
|
||||
networking.firewall.allowedUDPPorts = [ 53 ];
|
||||
systemd.services.pebble-challtestsrv = {
|
||||
enable = true;
|
||||
description = "Pebble ACME challenge test server";
|
||||
wantedBy = [ "network.target" ];
|
||||
serviceConfig = {
|
||||
ExecStart = "${pkgs.pebble}/bin/pebble-challtestsrv -dns01 ':53' -defaultIPv6 '' -defaultIPv4 '${nodes.webserver.config.networking.primaryIPAddress}'";
|
||||
# Required to bind on privileged ports.
|
||||
User = "root";
|
||||
Group = "root";
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
acmeStandalone = { nodes, lib, config, pkgs, ... }: {
|
||||
imports = [ commonConfig ];
|
||||
networking.nameservers = lib.mkForce [
|
||||
nodes.dnsserver.config.networking.primaryIPAddress
|
||||
];
|
||||
networking.firewall.allowedTCPPorts = [ 80 ];
|
||||
networking.extraHosts = ''
|
||||
${config.networking.primaryIPAddress} standalone.com
|
||||
'';
|
||||
security.acme = {
|
||||
server = "https://acme-v02.api.letsencrypt.org/dir";
|
||||
certs."standalone.com" = {
|
||||
@ -29,14 +62,12 @@ in import ./make-test-python.nix {
|
||||
};
|
||||
};
|
||||
|
||||
webserver = { config, pkgs, ... }: {
|
||||
webserver = { nodes, config, pkgs, lib, ... }: {
|
||||
imports = [ commonConfig ];
|
||||
networking.firewall.allowedTCPPorts = [ 80 443 ];
|
||||
|
||||
networking.extraHosts = ''
|
||||
${config.networking.primaryIPAddress} a.example.com
|
||||
${config.networking.primaryIPAddress} b.example.com
|
||||
'';
|
||||
networking.nameservers = lib.mkForce [
|
||||
nodes.dnsserver.config.networking.primaryIPAddress
|
||||
];
|
||||
|
||||
# A target remains active. Use this to probe the fact that
|
||||
# a service fired eventhough it is not RemainAfterExit
|
||||
@ -61,14 +92,11 @@ in import ./make-test-python.nix {
|
||||
|
||||
nesting.clone = [
|
||||
({pkgs, ...}: {
|
||||
|
||||
networking.extraHosts = ''
|
||||
${config.networking.primaryIPAddress} b.example.com
|
||||
'';
|
||||
systemd.targets."acme-finished-b.example.com" = {};
|
||||
systemd.services."acme-b.example.com" = {
|
||||
wants = [ "acme-finished-b.example.com.target" ];
|
||||
before = [ "acme-finished-b.example.com.target" ];
|
||||
after = [ "nginx.service" ];
|
||||
};
|
||||
services.nginx.virtualHosts."b.example.com" = {
|
||||
enableACME = true;
|
||||
@ -79,15 +107,48 @@ in import ./make-test-python.nix {
|
||||
'';
|
||||
};
|
||||
})
|
||||
({pkgs, config, nodes, lib, ...}: {
|
||||
security.acme.certs."example.com" = {
|
||||
domain = "*.example.com";
|
||||
dnsProvider = "exec";
|
||||
dnsPropagationCheck = false;
|
||||
credentialsFile = with pkgs; writeText "wildcard.env" ''
|
||||
EXEC_PATH=${dnsScript { inherit writeScript bash curl; dnsAddress = nodes.dnsserver.config.networking.primaryIPAddress; }}
|
||||
'';
|
||||
user = config.services.nginx.user;
|
||||
group = config.services.nginx.group;
|
||||
};
|
||||
systemd.targets."acme-finished-example.com" = {};
|
||||
systemd.services."acme-example.com" = {
|
||||
wants = [ "acme-finished-example.com.target" ];
|
||||
before = [ "acme-finished-example.com.target" "nginx.service" ];
|
||||
wantedBy = [ "nginx.service" ];
|
||||
};
|
||||
services.nginx.virtualHosts."c.example.com" = {
|
||||
forceSSL = true;
|
||||
sslCertificate = config.security.acme.certs."example.com".directory + "/cert.pem";
|
||||
sslTrustedCertificate = config.security.acme.certs."example.com".directory + "/full.pem";
|
||||
sslCertificateKey = config.security.acme.certs."example.com".directory + "/key.pem";
|
||||
locations."/".root = pkgs.runCommand "docroot" {} ''
|
||||
mkdir -p "$out"
|
||||
echo hello world > "$out/index.html"
|
||||
'';
|
||||
};
|
||||
})
|
||||
];
|
||||
};
|
||||
|
||||
client = commonConfig;
|
||||
client = {nodes, lib, ...}: {
|
||||
imports = [ commonConfig ];
|
||||
networking.nameservers = lib.mkForce [
|
||||
nodes.dnsserver.config.networking.primaryIPAddress
|
||||
];
|
||||
};
|
||||
};
|
||||
|
||||
testScript = {nodes, ...}:
|
||||
let
|
||||
newServerSystem = nodes.webserver2.config.system.build.toplevel;
|
||||
newServerSystem = nodes.webserver.config.system.build.toplevel;
|
||||
switchToNewServer = "${newServerSystem}/bin/switch-to-configuration test";
|
||||
in
|
||||
# Note, wait_for_unit does not work for oneshot services that do not have RemainAfterExit=true,
|
||||
@ -97,6 +158,17 @@ in import ./make-test-python.nix {
|
||||
# can use them to probe that a oneshot fired. It is a bit ugly, but it is the best we can do
|
||||
''
|
||||
client.start()
|
||||
dnsserver.start()
|
||||
|
||||
letsencrypt.wait_for_unit("default.target")
|
||||
dnsserver.wait_for_unit("pebble-challtestsrv.service")
|
||||
client.succeed(
|
||||
'curl --data \'{"host": "acme-v02.api.letsencrypt.org", "addresses": ["${nodes.letsencrypt.config.networking.primaryIPAddress}"]}\' http://${nodes.dnsserver.config.networking.primaryIPAddress}:8055/add-a'
|
||||
)
|
||||
client.succeed(
|
||||
'curl --data \'{"host": "standalone.com", "addresses": ["${nodes.acmeStandalone.config.networking.primaryIPAddress}"]}\' http://${nodes.dnsserver.config.networking.primaryIPAddress}:8055/add-a'
|
||||
)
|
||||
|
||||
letsencrypt.start()
|
||||
acmeStandalone.start()
|
||||
|
||||
@ -129,5 +201,17 @@ in import ./make-test-python.nix {
|
||||
client.succeed(
|
||||
"curl --cacert /tmp/ca.crt https://b.example.com/ | grep -qF 'hello world'"
|
||||
)
|
||||
|
||||
with subtest("Can request wildcard certificates using DNS-01 challenge"):
|
||||
webserver.succeed(
|
||||
"${switchToNewServer}"
|
||||
)
|
||||
webserver.succeed(
|
||||
"/run/current-system/fine-tune/child-2/bin/switch-to-configuration test"
|
||||
)
|
||||
webserver.wait_for_unit("acme-finished-example.com.target")
|
||||
client.succeed(
|
||||
"curl --cacert /tmp/ca.crt https://c.example.com/ | grep -qF 'hello world'"
|
||||
)
|
||||
'';
|
||||
}
|
||||
|
||||
@ -5,5 +5,8 @@ in {
|
||||
nodes.letsencrypt.config.networking.primaryIPAddress
|
||||
];
|
||||
|
||||
security.acme.acceptTerms = true;
|
||||
security.acme.email = "webmaster@example.com";
|
||||
|
||||
security.pki.certificateFiles = [ letsencrypt-ca ];
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user