39796cad46
Fixes #191794 Lego threw a permission denied error binding to port 80. AmbientCapabilities with CAP_NET_BIND_SERVICE was required. Also added a test for this.
616 lines
24 KiB
Nix
616 lines
24 KiB
Nix
{ pkgs, lib, ... }: let
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commonConfig = ./common/acme/client;
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dnsServerIP = nodes: nodes.dnsserver.networking.primaryIPAddress;
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dnsScript = nodes: let
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dnsAddress = dnsServerIP nodes;
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in pkgs.writeShellScript "dns-hook.sh" ''
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set -euo pipefail
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echo '[INFO]' "[$2]" 'dns-hook.sh' $*
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if [ "$1" = "present" ]; then
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${pkgs.curl}/bin/curl --data '{"host": "'"$2"'", "value": "'"$3"'"}' http://${dnsAddress}:8055/set-txt
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else
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${pkgs.curl}/bin/curl --data '{"host": "'"$2"'"}' http://${dnsAddress}:8055/clear-txt
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fi
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'';
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dnsConfig = nodes: {
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dnsProvider = "exec";
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dnsPropagationCheck = false;
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credentialsFile = pkgs.writeText "wildcard.env" ''
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EXEC_PATH=${dnsScript nodes}
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EXEC_POLLING_INTERVAL=1
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EXEC_PROPAGATION_TIMEOUT=1
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EXEC_SEQUENCE_INTERVAL=1
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'';
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};
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documentRoot = pkgs.runCommand "docroot" {} ''
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mkdir -p "$out"
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echo hello world > "$out/index.html"
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'';
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vhostBase = {
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forceSSL = true;
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locations."/".root = documentRoot;
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};
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vhostBaseHttpd = {
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forceSSL = true;
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inherit documentRoot;
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};
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# Base specialisation config for testing general ACME features
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webserverBasicConfig = {
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services.nginx.enable = true;
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services.nginx.virtualHosts."a.example.test" = vhostBase // {
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enableACME = true;
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};
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};
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# Generate specialisations for testing a web server
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mkServerConfigs = { server, group, vhostBaseData, extraConfig ? {} }: let
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baseConfig = { nodes, config, specialConfig ? {} }: lib.mkMerge [
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{
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security.acme = {
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defaults = (dnsConfig nodes);
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# One manual wildcard cert
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certs."example.test" = {
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domain = "*.example.test";
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};
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};
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users.users."${config.services."${server}".user}".extraGroups = ["acme"];
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services."${server}" = {
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enable = true;
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virtualHosts = {
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# Run-of-the-mill vhost using HTTP-01 validation
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"${server}-http.example.test" = vhostBaseData // {
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serverAliases = [ "${server}-http-alias.example.test" ];
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enableACME = true;
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};
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# Another which inherits the DNS-01 config
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"${server}-dns.example.test" = vhostBaseData // {
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serverAliases = [ "${server}-dns-alias.example.test" ];
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enableACME = true;
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# Set acmeRoot to null instead of using the default of "/var/lib/acme/acme-challenge"
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# webroot + dnsProvider are mutually exclusive.
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acmeRoot = null;
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};
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# One using the wildcard certificate
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"${server}-wildcard.example.test" = vhostBaseData // {
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serverAliases = [ "${server}-wildcard-alias.example.test" ];
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useACMEHost = "example.test";
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};
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};
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};
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# Used to determine if service reload was triggered
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systemd.targets."test-renew-${server}" = {
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wants = [ "acme-${server}-http.example.test.service" ];
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after = [ "acme-${server}-http.example.test.service" "${server}-config-reload.service" ];
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};
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}
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specialConfig
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extraConfig
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];
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in {
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"${server}".configuration = { nodes, config, ... }: baseConfig {
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inherit nodes config;
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};
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# Test that server reloads when an alias is removed (and subsequently test removal works in acme)
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"${server}-remove-alias".configuration = { nodes, config, ... }: baseConfig {
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inherit nodes config;
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specialConfig = {
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# Remove an alias, but create a standalone vhost in its place for testing.
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# This configuration results in certificate errors as useACMEHost does not imply
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# append extraDomains, and thus we can validate the SAN is removed.
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services."${server}" = {
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virtualHosts."${server}-http.example.test".serverAliases = lib.mkForce [];
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virtualHosts."${server}-http-alias.example.test" = vhostBaseData // {
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useACMEHost = "${server}-http.example.test";
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};
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};
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};
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};
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# Test that the server reloads when only the acme configuration is changed.
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"${server}-change-acme-conf".configuration = { nodes, config, ... }: baseConfig {
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inherit nodes config;
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specialConfig = {
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security.acme.certs."${server}-http.example.test" = {
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keyType = "ec384";
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# Also test that postRun is exec'd as root
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postRun = "id | grep root";
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};
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};
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};
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};
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in {
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name = "acme";
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meta.maintainers = lib.teams.acme.members;
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nodes = {
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# The fake ACME server which will respond to client requests
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acme = { nodes, ... }: {
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imports = [ ./common/acme/server ];
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networking.nameservers = lib.mkForce [ (dnsServerIP nodes) ];
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};
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# A fake DNS server which can be configured with records as desired
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# Used to test DNS-01 challenge
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dnsserver = { nodes, ... }: {
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networking.firewall.allowedTCPPorts = [ 8055 53 ];
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networking.firewall.allowedUDPPorts = [ 53 ];
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systemd.services.pebble-challtestsrv = {
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enable = true;
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description = "Pebble ACME challenge test server";
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wantedBy = [ "network.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.pebble}/bin/pebble-challtestsrv -dns01 ':53' -defaultIPv6 '' -defaultIPv4 '${nodes.webserver.networking.primaryIPAddress}'";
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# Required to bind on privileged ports.
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AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
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};
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};
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};
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# A web server which will be the node requesting certs
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webserver = { nodes, config, ... }: {
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imports = [ commonConfig ];
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networking.nameservers = lib.mkForce [ (dnsServerIP nodes) ];
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networking.firewall.allowedTCPPorts = [ 80 443 ];
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# OpenSSL will be used for more thorough certificate validation
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environment.systemPackages = [ pkgs.openssl ];
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# Set log level to info so that we can see when the service is reloaded
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services.nginx.logError = "stderr info";
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specialisation = {
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# Tests HTTP-01 verification using Lego's built-in web server
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http01lego.configuration = { ... }: {
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security.acme = {
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certs."http.example.test" = {
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listenHTTP = ":80";
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};
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};
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networking.firewall.allowedTCPPorts = [ 80 ];
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};
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# First derivation used to test general ACME features
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general.configuration = { ... }: let
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caDomain = nodes.acme.test-support.acme.caDomain;
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email = config.security.acme.defaults.email;
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# Exit 99 to make it easier to track if this is the reason a renew failed
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accountCreateTester = ''
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test -e accounts/${caDomain}/${email}/account.json || exit 99
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'';
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in lib.mkMerge [
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webserverBasicConfig
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{
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# Used to test that account creation is collated into one service.
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# These should not run until after acme-finished-a.example.test.target
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systemd.services."b.example.test".preStart = accountCreateTester;
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systemd.services."c.example.test".preStart = accountCreateTester;
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services.nginx.virtualHosts."b.example.test" = vhostBase // {
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enableACME = true;
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};
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services.nginx.virtualHosts."c.example.test" = vhostBase // {
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enableACME = true;
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};
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}
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];
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# Test OCSP Stapling
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ocsp-stapling.configuration = { ... }: lib.mkMerge [
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webserverBasicConfig
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{
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security.acme.certs."a.example.test".ocspMustStaple = true;
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services.nginx.virtualHosts."a.example.test" = {
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extraConfig = ''
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ssl_stapling on;
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ssl_stapling_verify on;
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'';
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};
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}
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];
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# Validate service relationships by adding a slow start service to nginx' wants.
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# Reproducer for https://github.com/NixOS/nixpkgs/issues/81842
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slow-startup.configuration = { ... }: lib.mkMerge [
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webserverBasicConfig
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{
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systemd.services.my-slow-service = {
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wantedBy = [ "multi-user.target" "nginx.service" ];
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before = [ "nginx.service" ];
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preStart = "sleep 5";
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script = "${pkgs.python3}/bin/python -m http.server";
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};
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services.nginx.virtualHosts."slow.example.test" = {
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forceSSL = true;
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enableACME = true;
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locations."/".proxyPass = "http://localhost:8000";
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};
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}
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];
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# Test lego internal server (listenHTTP option)
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# Also tests useRoot option
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lego-server.configuration = { ... }: {
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security.acme.useRoot = true;
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security.acme.certs."lego.example.test" = {
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listenHTTP = ":80";
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group = "nginx";
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};
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services.nginx.enable = true;
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services.nginx.virtualHosts."lego.example.test" = {
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useACMEHost = "lego.example.test";
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onlySSL = true;
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};
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};
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# Test compatiblity with Caddy
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# It only supports useACMEHost, hence not using mkServerConfigs
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} // (let
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baseCaddyConfig = { nodes, config, ... }: {
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security.acme = {
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defaults = (dnsConfig nodes);
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# One manual wildcard cert
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certs."example.test" = {
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domain = "*.example.test";
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};
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};
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users.users."${config.services.caddy.user}".extraGroups = ["acme"];
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services.caddy = {
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enable = true;
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virtualHosts."a.exmaple.test" = {
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useACMEHost = "example.test";
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extraConfig = ''
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root * ${documentRoot}
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'';
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};
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};
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};
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in {
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caddy.configuration = baseCaddyConfig;
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# Test that the server reloads when only the acme configuration is changed.
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"caddy-change-acme-conf".configuration = { nodes, config, ... }: lib.mkMerge [
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(baseCaddyConfig {
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inherit nodes config;
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})
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{
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security.acme.certs."example.test" = {
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keyType = "ec384";
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};
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}
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];
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# Test compatibility with Nginx
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}) // (mkServerConfigs {
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server = "nginx";
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group = "nginx";
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vhostBaseData = vhostBase;
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})
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# Test compatibility with Apache HTTPD
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// (mkServerConfigs {
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server = "httpd";
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group = "wwwrun";
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vhostBaseData = vhostBaseHttpd;
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extraConfig = {
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services.httpd.adminAddr = config.security.acme.defaults.email;
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};
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});
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};
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# The client will be used to curl the webserver to validate configuration
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client = { nodes, ... }: {
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imports = [ commonConfig ];
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networking.nameservers = lib.mkForce [ (dnsServerIP nodes) ];
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# OpenSSL will be used for more thorough certificate validation
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environment.systemPackages = [ pkgs.openssl ];
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};
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};
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testScript = { nodes, ... }:
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let
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caDomain = nodes.acme.test-support.acme.caDomain;
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newServerSystem = nodes.webserver.config.system.build.toplevel;
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switchToNewServer = "${newServerSystem}/bin/switch-to-configuration test";
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in
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# Note, wait_for_unit does not work for oneshot services that do not have RemainAfterExit=true,
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# this is because a oneshot goes from inactive => activating => inactive, and never
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# reaches the active state. Targets do not have this issue.
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''
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import time
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def switch_to(node, name):
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# On first switch, this will create a symlink to the current system so that we can
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# quickly switch between derivations
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root_specs = "/tmp/specialisation"
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node.execute(
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f"test -e {root_specs}"
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f" || ln -s $(readlink /run/current-system)/specialisation {root_specs}"
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)
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switcher_path = f"/run/current-system/specialisation/{name}/bin/switch-to-configuration"
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rc, _ = node.execute(f"test -e '{switcher_path}'")
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if rc > 0:
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switcher_path = f"/tmp/specialisation/{name}/bin/switch-to-configuration"
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node.succeed(
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f"{switcher_path} test"
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)
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# Ensures the issuer of our cert matches the chain
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# and matches the issuer we expect it to be.
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# It's a good validation to ensure the cert.pem and fullchain.pem
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# are not still selfsigned afer verification
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def check_issuer(node, cert_name, issuer):
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for fname in ("cert.pem", "fullchain.pem"):
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actual_issuer = node.succeed(
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f"openssl x509 -noout -issuer -in /var/lib/acme/{cert_name}/{fname}"
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).partition("=")[2]
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print(f"{fname} issuer: {actual_issuer}")
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assert issuer.lower() in actual_issuer.lower()
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# Ensure cert comes before chain in fullchain.pem
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def check_fullchain(node, cert_name):
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subject_data = node.succeed(
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f"openssl crl2pkcs7 -nocrl -certfile /var/lib/acme/{cert_name}/fullchain.pem"
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" | openssl pkcs7 -print_certs -noout"
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)
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for line in subject_data.lower().split("\n"):
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if "subject" in line:
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print(f"First subject in fullchain.pem: {line}")
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assert cert_name.lower() in line
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return
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assert False
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def check_connection(node, domain, retries=3):
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assert retries >= 0, f"Failed to connect to https://{domain}"
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result = node.succeed(
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"openssl s_client -brief -verify 2 -CAfile /tmp/ca.crt"
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f" -servername {domain} -connect {domain}:443 < /dev/null 2>&1"
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)
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for line in result.lower().split("\n"):
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if "verification" in line and "error" in line:
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time.sleep(3)
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return check_connection(node, domain, retries - 1)
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def check_connection_key_bits(node, domain, bits, retries=3):
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assert retries >= 0, f"Did not find expected number of bits ({bits}) in key"
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result = node.succeed(
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"openssl s_client -CAfile /tmp/ca.crt"
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f" -servername {domain} -connect {domain}:443 < /dev/null"
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" | openssl x509 -noout -text | grep -i Public-Key"
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)
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print("Key type:", result)
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if bits not in result:
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time.sleep(3)
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return check_connection_key_bits(node, domain, bits, retries - 1)
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def check_stapling(node, domain, retries=3):
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assert retries >= 0, "OCSP Stapling check failed"
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# Pebble doesn't provide a full OCSP responder, so just check the URL
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result = node.succeed(
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"openssl s_client -CAfile /tmp/ca.crt"
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f" -servername {domain} -connect {domain}:443 < /dev/null"
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" | openssl x509 -noout -ocsp_uri"
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)
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print("OCSP Responder URL:", result)
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if "${caDomain}:4002" not in result.lower():
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time.sleep(3)
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return check_stapling(node, domain, retries - 1)
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def download_ca_certs(node, retries=5):
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assert retries >= 0, "Failed to connect to pebble to download root CA certs"
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exit_code, _ = node.execute("curl https://${caDomain}:15000/roots/0 > /tmp/ca.crt")
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exit_code_2, _ = node.execute(
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"curl https://${caDomain}:15000/intermediate-keys/0 >> /tmp/ca.crt"
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)
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if exit_code + exit_code_2 > 0:
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time.sleep(3)
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return download_ca_certs(node, retries - 1)
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start_all()
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dnsserver.wait_for_unit("pebble-challtestsrv.service")
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client.wait_for_unit("default.target")
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client.succeed(
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'curl --data \'{"host": "${caDomain}", "addresses": ["${nodes.acme.networking.primaryIPAddress}"]}\' http://${dnsServerIP nodes}:8055/add-a'
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)
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acme.wait_for_unit("network-online.target")
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acme.wait_for_unit("pebble.service")
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download_ca_certs(client)
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# Perform http-01 w/ lego test first
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switch_to(webserver, "http01lego")
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with subtest("Can request certificate with Lego's built in web server"):
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webserver.wait_for_unit("acme-finished-http.example.test.target")
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check_fullchain(webserver, "http.example.test")
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check_issuer(webserver, "http.example.test", "pebble")
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# Perform general tests
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switch_to(webserver, "general")
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with subtest("Can request certificate with HTTP-01 challenge"):
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webserver.wait_for_unit("acme-finished-a.example.test.target")
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check_fullchain(webserver, "a.example.test")
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check_issuer(webserver, "a.example.test", "pebble")
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webserver.wait_for_unit("nginx.service")
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check_connection(client, "a.example.test")
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with subtest("Runs 1 cert for account creation before others"):
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webserver.wait_for_unit("acme-finished-b.example.test.target")
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webserver.wait_for_unit("acme-finished-c.example.test.target")
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check_connection(client, "b.example.test")
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check_connection(client, "c.example.test")
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with subtest("Certificates and accounts have safe + valid permissions"):
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# Nginx will set the group appropriately when enableACME is used
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group = "nginx"
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webserver.succeed(
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f"test $(stat -L -c '%a %U %G' /var/lib/acme/a.example.test/*.pem | tee /dev/stderr | grep '640 acme {group}' | wc -l) -eq 5"
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)
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webserver.succeed(
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f"test $(stat -L -c '%a %U %G' /var/lib/acme/.lego/a.example.test/**/a.example.test* | tee /dev/stderr | grep '600 acme {group}' | wc -l) -eq 4"
|
|
)
|
|
webserver.succeed(
|
|
f"test $(stat -L -c '%a %U %G' /var/lib/acme/a.example.test | tee /dev/stderr | grep '750 acme {group}' | wc -l) -eq 1"
|
|
)
|
|
webserver.succeed(
|
|
f"test $(find /var/lib/acme/accounts -type f -exec stat -L -c '%a %U %G' {{}} \\; | tee /dev/stderr | grep -v '600 acme {group}' | wc -l) -eq 0"
|
|
)
|
|
|
|
# Selfsigned certs tests happen late so we aren't fighting the system init triggering cert renewal
|
|
with subtest("Can generate valid selfsigned certs"):
|
|
webserver.succeed("systemctl clean acme-a.example.test.service --what=state")
|
|
webserver.succeed("systemctl start acme-selfsigned-a.example.test.service")
|
|
check_fullchain(webserver, "a.example.test")
|
|
check_issuer(webserver, "a.example.test", "minica")
|
|
# Check selfsigned permissions
|
|
webserver.succeed(
|
|
f"test $(stat -L -c '%a %U %G' /var/lib/acme/a.example.test/*.pem | tee /dev/stderr | grep '640 acme {group}' | wc -l) -eq 5"
|
|
)
|
|
# Will succeed if nginx can load the certs
|
|
webserver.succeed("systemctl start nginx-config-reload.service")
|
|
|
|
with subtest("Correctly implements OCSP stapling"):
|
|
switch_to(webserver, "ocsp-stapling")
|
|
webserver.wait_for_unit("acme-finished-a.example.test.target")
|
|
check_stapling(client, "a.example.test")
|
|
|
|
with subtest("Can request certificate with HTTP-01 using lego's internal web server"):
|
|
switch_to(webserver, "lego-server")
|
|
webserver.wait_for_unit("acme-finished-lego.example.test.target")
|
|
webserver.wait_for_unit("nginx.service")
|
|
webserver.succeed("echo HENLO && systemctl cat nginx.service")
|
|
webserver.succeed("test \"$(stat -c '%U' /var/lib/acme/* | uniq)\" = \"root\"")
|
|
check_connection(client, "a.example.test")
|
|
check_connection(client, "lego.example.test")
|
|
|
|
with subtest("Can request certificate with HTTP-01 when nginx startup is delayed"):
|
|
webserver.execute("systemctl stop nginx")
|
|
switch_to(webserver, "slow-startup")
|
|
webserver.wait_for_unit("acme-finished-slow.example.test.target")
|
|
check_issuer(webserver, "slow.example.test", "pebble")
|
|
webserver.wait_for_unit("nginx.service")
|
|
check_connection(client, "slow.example.test")
|
|
|
|
with subtest("Works with caddy"):
|
|
switch_to(webserver, "caddy")
|
|
webserver.wait_for_unit("acme-finished-example.test.target")
|
|
webserver.wait_for_unit("caddy.service")
|
|
# FIXME reloading caddy is not sufficient to load new certs.
|
|
# Restart it manually until this is fixed.
|
|
webserver.succeed("systemctl restart caddy.service")
|
|
check_connection(client, "a.example.test")
|
|
|
|
with subtest("security.acme changes reflect on caddy"):
|
|
switch_to(webserver, "caddy-change-acme-conf")
|
|
webserver.wait_for_unit("acme-finished-example.test.target")
|
|
webserver.wait_for_unit("caddy.service")
|
|
# FIXME reloading caddy is not sufficient to load new certs.
|
|
# Restart it manually until this is fixed.
|
|
webserver.succeed("systemctl restart caddy.service")
|
|
check_connection_key_bits(client, "a.example.test", "384")
|
|
|
|
domains = ["http", "dns", "wildcard"]
|
|
for server, logsrc in [
|
|
("nginx", "journalctl -n 30 -u nginx.service"),
|
|
("httpd", "tail -n 30 /var/log/httpd/*.log"),
|
|
]:
|
|
wait_for_server = lambda: webserver.wait_for_unit(f"{server}.service")
|
|
with subtest(f"Works with {server}"):
|
|
try:
|
|
switch_to(webserver, server)
|
|
# Skip wildcard domain for this check ([:-1])
|
|
for domain in domains[:-1]:
|
|
webserver.wait_for_unit(
|
|
f"acme-finished-{server}-{domain}.example.test.target"
|
|
)
|
|
except Exception as err:
|
|
_, output = webserver.execute(
|
|
f"{logsrc} && ls -al /var/lib/acme/acme-challenge"
|
|
)
|
|
print(output)
|
|
raise err
|
|
|
|
wait_for_server()
|
|
|
|
for domain in domains[:-1]:
|
|
check_issuer(webserver, f"{server}-{domain}.example.test", "pebble")
|
|
for domain in domains:
|
|
check_connection(client, f"{server}-{domain}.example.test")
|
|
check_connection(client, f"{server}-{domain}-alias.example.test")
|
|
|
|
test_domain = f"{server}-{domains[0]}.example.test"
|
|
|
|
with subtest(f"Can reload {server} when timer triggers renewal"):
|
|
# Switch to selfsigned first
|
|
webserver.succeed(f"systemctl clean acme-{test_domain}.service --what=state")
|
|
webserver.succeed(f"systemctl start acme-selfsigned-{test_domain}.service")
|
|
check_issuer(webserver, test_domain, "minica")
|
|
webserver.succeed(f"systemctl start {server}-config-reload.service")
|
|
webserver.succeed(f"systemctl start test-renew-{server}.target")
|
|
check_issuer(webserver, test_domain, "pebble")
|
|
check_connection(client, test_domain)
|
|
|
|
with subtest("Can remove an alias from a domain + cert is updated"):
|
|
test_alias = f"{server}-{domains[0]}-alias.example.test"
|
|
switch_to(webserver, f"{server}-remove-alias")
|
|
webserver.wait_for_unit(f"acme-finished-{test_domain}.target")
|
|
wait_for_server()
|
|
check_connection(client, test_domain)
|
|
rc, _s = client.execute(
|
|
f"openssl s_client -CAfile /tmp/ca.crt -connect {test_alias}:443"
|
|
" </dev/null 2>/dev/null | openssl x509 -noout -text"
|
|
f" | grep DNS: | grep {test_alias}"
|
|
)
|
|
assert rc > 0, "Removed extraDomainName was not removed from the cert"
|
|
|
|
with subtest("security.acme changes reflect on web server"):
|
|
# Switch back to normal server config first, reset everything.
|
|
switch_to(webserver, server)
|
|
wait_for_server()
|
|
switch_to(webserver, f"{server}-change-acme-conf")
|
|
webserver.wait_for_unit(f"acme-finished-{test_domain}.target")
|
|
wait_for_server()
|
|
check_connection_key_bits(client, test_domain, "384")
|
|
'';
|
|
}
|