mirror of
https://github.com/SebastianWendel/nixpkgs.git
synced 2024-11-06 02:06:46 +01:00
00975b5628
This reverts commit7dc6e77bc2, reversing changes made tobce47ea9d5. Motivation for the revert in #67563
391 lines
12 KiB
Nix
391 lines
12 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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top = config.services.kubernetes;
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cfg = top.pki;
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csrCA = pkgs.writeText "kube-pki-cacert-csr.json" (builtins.toJSON {
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key = {
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algo = "rsa";
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size = 2048;
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};
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names = singleton cfg.caSpec;
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});
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csrCfssl = pkgs.writeText "kube-pki-cfssl-csr.json" (builtins.toJSON {
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key = {
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algo = "rsa";
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size = 2048;
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};
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CN = top.masterAddress;
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});
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cfsslAPITokenBaseName = "apitoken.secret";
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cfsslAPITokenPath = "${config.services.cfssl.dataDir}/${cfsslAPITokenBaseName}";
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certmgrAPITokenPath = "${top.secretsPath}/${cfsslAPITokenBaseName}";
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cfsslAPITokenLength = 32;
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clusterAdminKubeconfig = with cfg.certs.clusterAdmin;
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top.lib.mkKubeConfig "cluster-admin" {
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server = top.apiserverAddress;
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certFile = cert;
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keyFile = key;
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};
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remote = with config.services; "https://${kubernetes.masterAddress}:${toString cfssl.port}";
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in
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{
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###### interface
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options.services.kubernetes.pki = with lib.types; {
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enable = mkEnableOption "easyCert issuer service";
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certs = mkOption {
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description = "List of certificate specs to feed to cert generator.";
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default = {};
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type = attrs;
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};
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genCfsslCACert = mkOption {
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description = ''
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Whether to automatically generate cfssl CA certificate and key,
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if they don't exist.
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'';
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default = true;
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type = bool;
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};
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genCfsslAPICerts = mkOption {
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description = ''
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Whether to automatically generate cfssl API webserver TLS cert and key,
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if they don't exist.
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'';
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default = true;
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type = bool;
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};
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genCfsslAPIToken = mkOption {
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description = ''
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Whether to automatically generate cfssl API-token secret,
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if they doesn't exist.
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'';
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default = true;
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type = bool;
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};
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pkiTrustOnBootstrap = mkOption {
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description = "Whether to always trust remote cfssl server upon initial PKI bootstrap.";
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default = true;
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type = bool;
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};
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caCertPathPrefix = mkOption {
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description = ''
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Path-prefrix for the CA-certificate to be used for cfssl signing.
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Suffixes ".pem" and "-key.pem" will be automatically appended for
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the public and private keys respectively.
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'';
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default = "${config.services.cfssl.dataDir}/ca";
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type = str;
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};
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caSpec = mkOption {
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description = "Certificate specification for the auto-generated CAcert.";
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default = {
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CN = "kubernetes-cluster-ca";
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O = "NixOS";
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OU = "services.kubernetes.pki.caSpec";
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L = "auto-generated";
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};
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type = attrs;
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};
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etcClusterAdminKubeconfig = mkOption {
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description = ''
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Symlink a kubeconfig with cluster-admin privileges to environment path
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(/etc/<path>).
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'';
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default = null;
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type = nullOr str;
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};
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};
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###### implementation
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config = mkIf cfg.enable
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(let
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cfsslCertPathPrefix = "${config.services.cfssl.dataDir}/cfssl";
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cfsslCert = "${cfsslCertPathPrefix}.pem";
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cfsslKey = "${cfsslCertPathPrefix}-key.pem";
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in
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{
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services.cfssl = mkIf (top.apiserver.enable) {
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enable = true;
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address = "0.0.0.0";
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tlsCert = cfsslCert;
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tlsKey = cfsslKey;
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configFile = toString (pkgs.writeText "cfssl-config.json" (builtins.toJSON {
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signing = {
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profiles = {
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default = {
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usages = ["digital signature"];
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auth_key = "default";
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expiry = "720h";
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};
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};
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};
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auth_keys = {
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default = {
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type = "standard";
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key = "file:${cfsslAPITokenPath}";
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};
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};
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}));
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};
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systemd.services.cfssl.preStart = with pkgs; with config.services.cfssl; mkIf (top.apiserver.enable)
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(concatStringsSep "\n" [
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"set -e"
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(optionalString cfg.genCfsslCACert ''
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if [ ! -f "${cfg.caCertPathPrefix}.pem" ]; then
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${cfssl}/bin/cfssl genkey -initca ${csrCA} | \
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${cfssl}/bin/cfssljson -bare ${cfg.caCertPathPrefix}
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fi
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'')
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(optionalString cfg.genCfsslAPICerts ''
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if [ ! -f "${dataDir}/cfssl.pem" ]; then
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${cfssl}/bin/cfssl gencert -ca "${cfg.caCertPathPrefix}.pem" -ca-key "${cfg.caCertPathPrefix}-key.pem" ${csrCfssl} | \
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${cfssl}/bin/cfssljson -bare ${cfsslCertPathPrefix}
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fi
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'')
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(optionalString cfg.genCfsslAPIToken ''
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if [ ! -f "${cfsslAPITokenPath}" ]; then
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head -c ${toString (cfsslAPITokenLength / 2)} /dev/urandom | od -An -t x | tr -d ' ' >"${cfsslAPITokenPath}"
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fi
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chown cfssl "${cfsslAPITokenPath}" && chmod 400 "${cfsslAPITokenPath}"
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'')]);
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systemd.services.kube-certmgr-bootstrap = {
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description = "Kubernetes certmgr bootstrapper";
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wantedBy = [ "certmgr.service" ];
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after = [ "cfssl.target" ];
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script = concatStringsSep "\n" [''
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set -e
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# If there's a cfssl (cert issuer) running locally, then don't rely on user to
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# manually paste it in place. Just symlink.
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# otherwise, create the target file, ready for users to insert the token
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if [ -f "${cfsslAPITokenPath}" ]; then
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ln -fs "${cfsslAPITokenPath}" "${certmgrAPITokenPath}"
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else
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touch "${certmgrAPITokenPath}" && chmod 600 "${certmgrAPITokenPath}"
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fi
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''
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(optionalString (cfg.pkiTrustOnBootstrap) ''
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if [ ! -f "${top.caFile}" ] || [ $(cat "${top.caFile}" | wc -c) -lt 1 ]; then
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${pkgs.curl}/bin/curl --fail-early -f -kd '{}' ${remote}/api/v1/cfssl/info | \
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${pkgs.cfssl}/bin/cfssljson -stdout >${top.caFile}
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fi
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'')
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];
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serviceConfig = {
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RestartSec = "10s";
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Restart = "on-failure";
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};
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};
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services.certmgr = {
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enable = true;
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package = pkgs.certmgr-selfsigned;
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svcManager = "command";
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specs =
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let
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mkSpec = _: cert: {
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inherit (cert) action;
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authority = {
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inherit remote;
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file.path = cert.caCert;
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root_ca = cert.caCert;
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profile = "default";
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auth_key_file = certmgrAPITokenPath;
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};
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certificate = {
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path = cert.cert;
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};
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private_key = cert.privateKeyOptions;
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request = {
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inherit (cert) CN hosts;
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key = {
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algo = "rsa";
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size = 2048;
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};
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names = [ cert.fields ];
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};
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};
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in
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mapAttrs mkSpec cfg.certs;
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};
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#TODO: Get rid of kube-addon-manager in the future for the following reasons
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# - it is basically just a shell script wrapped around kubectl
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# - it assumes that it is clusterAdmin or can gain clusterAdmin rights through serviceAccount
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# - it is designed to be used with k8s system components only
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# - it would be better with a more Nix-oriented way of managing addons
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systemd.services.kube-addon-manager = mkIf top.addonManager.enable (mkMerge [{
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environment.KUBECONFIG = with cfg.certs.addonManager;
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top.lib.mkKubeConfig "addon-manager" {
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server = top.apiserverAddress;
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certFile = cert;
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keyFile = key;
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};
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}
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(optionalAttrs (top.addonManager.bootstrapAddons != {}) {
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serviceConfig.PermissionsStartOnly = true;
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preStart = with pkgs;
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let
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files = mapAttrsToList (n: v: writeText "${n}.json" (builtins.toJSON v))
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top.addonManager.bootstrapAddons;
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in
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''
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export KUBECONFIG=${clusterAdminKubeconfig}
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${kubectl}/bin/kubectl apply -f ${concatStringsSep " \\\n -f " files}
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'';
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})]);
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environment.etc.${cfg.etcClusterAdminKubeconfig}.source = mkIf (!isNull cfg.etcClusterAdminKubeconfig)
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clusterAdminKubeconfig;
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environment.systemPackages = mkIf (top.kubelet.enable || top.proxy.enable) [
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(pkgs.writeScriptBin "nixos-kubernetes-node-join" ''
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set -e
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exec 1>&2
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if [ $# -gt 0 ]; then
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echo "Usage: $(basename $0)"
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echo ""
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echo "No args. Apitoken must be provided on stdin."
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echo "To get the apitoken, execute: 'sudo cat ${certmgrAPITokenPath}' on the master node."
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exit 1
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fi
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if [ $(id -u) != 0 ]; then
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echo "Run as root please."
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exit 1
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fi
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read -r token
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if [ ''${#token} != ${toString cfsslAPITokenLength} ]; then
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echo "Token must be of length ${toString cfsslAPITokenLength}."
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exit 1
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fi
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echo $token > ${certmgrAPITokenPath}
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chmod 600 ${certmgrAPITokenPath}
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echo "Restarting certmgr..." >&1
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systemctl restart certmgr
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echo "Waiting for certs to appear..." >&1
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${optionalString top.kubelet.enable ''
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while [ ! -f ${cfg.certs.kubelet.cert} ]; do sleep 1; done
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echo "Restarting kubelet..." >&1
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systemctl restart kubelet
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''}
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${optionalString top.proxy.enable ''
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while [ ! -f ${cfg.certs.kubeProxyClient.cert} ]; do sleep 1; done
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echo "Restarting kube-proxy..." >&1
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systemctl restart kube-proxy
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''}
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${optionalString top.flannel.enable ''
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while [ ! -f ${cfg.certs.flannelClient.cert} ]; do sleep 1; done
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echo "Restarting flannel..." >&1
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systemctl restart flannel
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''}
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echo "Node joined succesfully"
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'')];
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# isolate etcd on loopback at the master node
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# easyCerts doesn't support multimaster clusters anyway atm.
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services.etcd = with cfg.certs.etcd; {
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listenClientUrls = ["https://127.0.0.1:2379"];
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listenPeerUrls = ["https://127.0.0.1:2380"];
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advertiseClientUrls = ["https://etcd.local:2379"];
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initialCluster = ["${top.masterAddress}=https://etcd.local:2380"];
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initialAdvertisePeerUrls = ["https://etcd.local:2380"];
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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trustedCaFile = mkDefault caCert;
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};
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networking.extraHosts = mkIf (config.services.etcd.enable) ''
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127.0.0.1 etcd.${top.addons.dns.clusterDomain} etcd.local
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'';
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services.flannel = with cfg.certs.flannelClient; {
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kubeconfig = top.lib.mkKubeConfig "flannel" {
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server = top.apiserverAddress;
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certFile = cert;
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keyFile = key;
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};
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};
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services.kubernetes = {
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apiserver = mkIf top.apiserver.enable (with cfg.certs.apiServer; {
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etcd = with cfg.certs.apiserverEtcdClient; {
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servers = ["https://etcd.local:2379"];
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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caFile = mkDefault caCert;
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};
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clientCaFile = mkDefault caCert;
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tlsCertFile = mkDefault cert;
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tlsKeyFile = mkDefault key;
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serviceAccountKeyFile = mkDefault cfg.certs.serviceAccount.cert;
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kubeletClientCaFile = mkDefault caCert;
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kubeletClientCertFile = mkDefault cfg.certs.apiserverKubeletClient.cert;
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kubeletClientKeyFile = mkDefault cfg.certs.apiserverKubeletClient.key;
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proxyClientCertFile = mkDefault cfg.certs.apiserverProxyClient.cert;
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proxyClientKeyFile = mkDefault cfg.certs.apiserverProxyClient.key;
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});
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controllerManager = mkIf top.controllerManager.enable {
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serviceAccountKeyFile = mkDefault cfg.certs.serviceAccount.key;
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rootCaFile = cfg.certs.controllerManagerClient.caCert;
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kubeconfig = with cfg.certs.controllerManagerClient; {
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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};
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};
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scheduler = mkIf top.scheduler.enable {
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kubeconfig = with cfg.certs.schedulerClient; {
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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};
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};
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kubelet = mkIf top.kubelet.enable {
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clientCaFile = mkDefault cfg.certs.kubelet.caCert;
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tlsCertFile = mkDefault cfg.certs.kubelet.cert;
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tlsKeyFile = mkDefault cfg.certs.kubelet.key;
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kubeconfig = with cfg.certs.kubeletClient; {
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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};
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};
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proxy = mkIf top.proxy.enable {
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kubeconfig = with cfg.certs.kubeProxyClient; {
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certFile = mkDefault cert;
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keyFile = mkDefault key;
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};
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};
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};
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});
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}
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