mirror of https://github.com/k3s-io/k3s
651 lines
16 KiB
Go
651 lines
16 KiB
Go
package deps
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import (
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"crypto"
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cryptorand "crypto/rand"
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"crypto/x509"
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b64 "encoding/base64"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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"time"
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certutil "github.com/rancher/dynamiclistener/cert"
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"github.com/rancher/k3s/pkg/clientaccess"
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"github.com/rancher/k3s/pkg/daemons/config"
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"github.com/rancher/k3s/pkg/passwd"
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"github.com/rancher/k3s/pkg/token"
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"github.com/rancher/k3s/pkg/version"
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"github.com/sirupsen/logrus"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/sets"
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apiserverconfigv1 "k8s.io/apiserver/pkg/apis/config/v1"
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"k8s.io/kubernetes/pkg/controlplane"
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)
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const (
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ipsecTokenSize = 48
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aescbcKeySize = 32
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RequestHeaderCN = "system:auth-proxy"
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)
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var (
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kubeconfigTemplate = template.Must(template.New("kubeconfig").Parse(`apiVersion: v1
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clusters:
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- cluster:
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server: {{.URL}}
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certificate-authority: {{.CACert}}
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name: local
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contexts:
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- context:
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cluster: local
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namespace: default
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user: user
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name: Default
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current-context: Default
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kind: Config
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preferences: {}
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users:
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- name: user
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user:
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client-certificate: {{.ClientCert}}
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client-key: {{.ClientKey}}
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`))
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)
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func migratePassword(p *passwd.Passwd) error {
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server, _ := p.Pass("server")
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node, _ := p.Pass("node")
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if server == "" && node != "" {
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return p.EnsureUser("server", version.Program+":server", node)
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}
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return nil
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}
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func KubeConfig(dest, url, caCert, clientCert, clientKey string) error {
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data := struct {
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URL string
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CACert string
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ClientCert string
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ClientKey string
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}{
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URL: url,
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CACert: caCert,
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ClientCert: clientCert,
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ClientKey: clientKey,
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}
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output, err := os.Create(dest)
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if err != nil {
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return err
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}
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defer output.Close()
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return kubeconfigTemplate.Execute(output, &data)
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}
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// GenServerDeps is responsible for generating the cluster dependencies
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// needed to successfully bootstrap a cluster.
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func GenServerDeps(config *config.Control, runtime *config.ControlRuntime) error {
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if err := genCerts(config, runtime); err != nil {
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return err
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}
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if err := genServiceAccount(runtime); err != nil {
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return err
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}
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if err := genUsers(config, runtime); err != nil {
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return err
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}
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if err := genEncryptedNetworkInfo(config, runtime); err != nil {
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return err
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}
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if err := genEncryptionConfig(config, runtime); err != nil {
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return err
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}
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return readTokens(runtime)
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}
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func readTokens(runtime *config.ControlRuntime) error {
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tokens, err := passwd.Read(runtime.PasswdFile)
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if err != nil {
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return err
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}
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if nodeToken, ok := tokens.Pass("node"); ok {
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runtime.AgentToken = "node:" + nodeToken
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}
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if serverToken, ok := tokens.Pass("server"); ok {
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runtime.ServerToken = "server:" + serverToken
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}
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return nil
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}
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func getNodePass(config *config.Control, serverPass string) string {
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if config.AgentToken == "" {
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if _, passwd, ok := clientaccess.ParseUsernamePassword(serverPass); ok {
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return passwd
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}
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return serverPass
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}
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return config.AgentToken
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}
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func genUsers(config *config.Control, runtime *config.ControlRuntime) error {
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passwd, err := passwd.Read(runtime.PasswdFile)
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if err != nil {
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return err
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}
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if err := migratePassword(passwd); err != nil {
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return err
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}
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serverPass, err := getServerPass(passwd, config)
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if err != nil {
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return err
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}
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nodePass := getNodePass(config, serverPass)
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if err := passwd.EnsureUser("node", version.Program+":agent", nodePass); err != nil {
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return err
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}
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if err := passwd.EnsureUser("server", version.Program+":server", serverPass); err != nil {
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return err
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}
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return passwd.Write(runtime.PasswdFile)
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}
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func genEncryptedNetworkInfo(controlConfig *config.Control, runtime *config.ControlRuntime) error {
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if s, err := os.Stat(runtime.IPSECKey); err == nil && s.Size() > 0 {
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psk, err := ioutil.ReadFile(runtime.IPSECKey)
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if err != nil {
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return err
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}
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controlConfig.IPSECPSK = strings.TrimSpace(string(psk))
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return nil
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}
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psk, err := token.Random(ipsecTokenSize)
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if err != nil {
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return err
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}
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controlConfig.IPSECPSK = psk
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if err := ioutil.WriteFile(runtime.IPSECKey, []byte(psk+"\n"), 0600); err != nil {
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return err
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}
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return nil
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}
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func getServerPass(passwd *passwd.Passwd, config *config.Control) (string, error) {
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var (
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err error
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)
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serverPass := config.Token
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if serverPass == "" {
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serverPass, _ = passwd.Pass("server")
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}
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if serverPass == "" {
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serverPass, err = token.Random(16)
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if err != nil {
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return "", err
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}
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}
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return serverPass, nil
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}
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func genCerts(config *config.Control, runtime *config.ControlRuntime) error {
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if err := genClientCerts(config, runtime); err != nil {
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return err
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}
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if err := genServerCerts(config, runtime); err != nil {
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return err
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}
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if err := genRequestHeaderCerts(config, runtime); err != nil {
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return err
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}
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return genETCDCerts(config, runtime)
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}
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func getSigningCertFactory(regen bool, altNames *certutil.AltNames, extKeyUsage []x509.ExtKeyUsage, caCertFile, caKeyFile string) signedCertFactory {
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return func(commonName string, organization []string, certFile, keyFile string) (bool, error) {
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return createClientCertKey(regen, commonName, organization, altNames, extKeyUsage, caCertFile, caKeyFile, certFile, keyFile)
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}
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}
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func genClientCerts(config *config.Control, runtime *config.ControlRuntime) error {
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regen, err := createSigningCertKey(version.Program+"-client", runtime.ClientCA, runtime.ClientCAKey)
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if err != nil {
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return err
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}
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factory := getSigningCertFactory(regen, nil, []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}, runtime.ClientCA, runtime.ClientCAKey)
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var certGen bool
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apiEndpoint := fmt.Sprintf("https://127.0.0.1:%d", config.APIServerPort)
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certGen, err = factory("system:admin", []string{"system:masters"}, runtime.ClientAdminCert, runtime.ClientAdminKey)
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if err != nil {
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return err
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}
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if certGen {
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if err := KubeConfig(runtime.KubeConfigAdmin, apiEndpoint, runtime.ServerCA, runtime.ClientAdminCert, runtime.ClientAdminKey); err != nil {
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return err
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}
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}
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certGen, err = factory("system:kube-controller-manager", nil, runtime.ClientControllerCert, runtime.ClientControllerKey)
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if err != nil {
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return err
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}
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if certGen {
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if err := KubeConfig(runtime.KubeConfigController, apiEndpoint, runtime.ServerCA, runtime.ClientControllerCert, runtime.ClientControllerKey); err != nil {
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return err
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}
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}
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certGen, err = factory("system:kube-scheduler", nil, runtime.ClientSchedulerCert, runtime.ClientSchedulerKey)
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if err != nil {
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return err
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}
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if certGen {
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if err := KubeConfig(runtime.KubeConfigScheduler, apiEndpoint, runtime.ServerCA, runtime.ClientSchedulerCert, runtime.ClientSchedulerKey); err != nil {
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return err
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}
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}
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certGen, err = factory("kube-apiserver", nil, runtime.ClientKubeAPICert, runtime.ClientKubeAPIKey)
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if err != nil {
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return err
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}
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if certGen {
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if err := KubeConfig(runtime.KubeConfigAPIServer, apiEndpoint, runtime.ServerCA, runtime.ClientKubeAPICert, runtime.ClientKubeAPIKey); err != nil {
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return err
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}
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}
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if _, err = factory("system:kube-proxy", nil, runtime.ClientKubeProxyCert, runtime.ClientKubeProxyKey); err != nil {
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return err
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}
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// This user (system:k3s-controller by default) must be bound to a role in rolebindings.yaml or the downstream equivalent
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if _, err = factory("system:"+version.Program+"-controller", nil, runtime.ClientK3sControllerCert, runtime.ClientK3sControllerKey); err != nil {
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return err
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}
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if _, _, err := certutil.LoadOrGenerateKeyFile(runtime.ClientKubeletKey, regen); err != nil {
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return err
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}
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certGen, err = factory(version.Program+"-cloud-controller-manager", nil, runtime.ClientCloudControllerCert, runtime.ClientCloudControllerKey)
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if err != nil {
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return err
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}
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if certGen {
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if err := KubeConfig(runtime.KubeConfigCloudController, apiEndpoint, runtime.ServerCA, runtime.ClientCloudControllerCert, runtime.ClientCloudControllerKey); err != nil {
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return err
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}
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}
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return nil
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}
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func genServerCerts(config *config.Control, runtime *config.ControlRuntime) error {
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regen, err := createServerSigningCertKey(config, runtime)
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if err != nil {
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return err
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}
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_, apiServerServiceIP, err := controlplane.ServiceIPRange(*config.ServiceIPRange)
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if err != nil {
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return err
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}
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altNames := &certutil.AltNames{
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DNSNames: []string{"localhost", "kubernetes", "kubernetes.default", "kubernetes.default.svc." + config.ClusterDomain},
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IPs: []net.IP{apiServerServiceIP},
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}
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addSANs(altNames, config.SANs)
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if _, err := createClientCertKey(regen, "kube-apiserver", nil,
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altNames, []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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runtime.ServerCA, runtime.ServerCAKey,
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runtime.ServingKubeAPICert, runtime.ServingKubeAPIKey); err != nil {
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return err
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}
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if _, _, err := certutil.LoadOrGenerateKeyFile(runtime.ServingKubeletKey, regen); err != nil {
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return err
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}
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return nil
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}
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func genETCDCerts(config *config.Control, runtime *config.ControlRuntime) error {
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regen, err := createSigningCertKey("etcd-server", runtime.ETCDServerCA, runtime.ETCDServerCAKey)
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if err != nil {
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return err
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}
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altNames := &certutil.AltNames{
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DNSNames: []string{"localhost"},
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}
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addSANs(altNames, config.SANs)
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if _, err := createClientCertKey(regen, "etcd-server", nil,
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altNames, []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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runtime.ETCDServerCA, runtime.ETCDServerCAKey,
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runtime.ServerETCDCert, runtime.ServerETCDKey); err != nil {
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return err
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}
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if _, err := createClientCertKey(regen, "etcd-client", nil,
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nil, []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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runtime.ETCDServerCA, runtime.ETCDServerCAKey,
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runtime.ClientETCDCert, runtime.ClientETCDKey); err != nil {
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return err
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}
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regen, err = createSigningCertKey("etcd-peer", runtime.ETCDPeerCA, runtime.ETCDPeerCAKey)
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if err != nil {
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return err
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}
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if _, err := createClientCertKey(regen, "etcd-peer", nil,
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altNames, []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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runtime.ETCDPeerCA, runtime.ETCDPeerCAKey,
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runtime.PeerServerClientETCDCert, runtime.PeerServerClientETCDKey); err != nil {
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return err
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}
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return nil
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}
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func genRequestHeaderCerts(config *config.Control, runtime *config.ControlRuntime) error {
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regen, err := createSigningCertKey(version.Program+"-request-header", runtime.RequestHeaderCA, runtime.RequestHeaderCAKey)
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if err != nil {
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return err
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}
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if _, err := createClientCertKey(regen, RequestHeaderCN, nil,
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nil, []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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runtime.RequestHeaderCA, runtime.RequestHeaderCAKey,
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runtime.ClientAuthProxyCert, runtime.ClientAuthProxyKey); err != nil {
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return err
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}
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return nil
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}
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type signedCertFactory = func(commonName string, organization []string, certFile, keyFile string) (bool, error)
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func createServerSigningCertKey(config *config.Control, runtime *config.ControlRuntime) (bool, error) {
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TokenCA := filepath.Join(config.DataDir, "tls", "token-ca.crt")
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TokenCAKey := filepath.Join(config.DataDir, "tls", "token-ca.key")
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if exists(TokenCA, TokenCAKey) && !exists(runtime.ServerCA) && !exists(runtime.ServerCAKey) {
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logrus.Infof("Upgrading token-ca files to server-ca")
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if err := os.Link(TokenCA, runtime.ServerCA); err != nil {
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return false, err
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}
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if err := os.Link(TokenCAKey, runtime.ServerCAKey); err != nil {
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return false, err
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}
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return true, nil
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}
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return createSigningCertKey(version.Program+"-server", runtime.ServerCA, runtime.ServerCAKey)
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}
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func addSANs(altNames *certutil.AltNames, sans []string) {
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for _, san := range sans {
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ip := net.ParseIP(san)
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if ip == nil {
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altNames.DNSNames = append(altNames.DNSNames, san)
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} else {
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altNames.IPs = append(altNames.IPs, ip)
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}
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}
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}
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func sansChanged(certFile string, sans *certutil.AltNames) bool {
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if sans == nil {
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return false
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}
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certBytes, err := ioutil.ReadFile(certFile)
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if err != nil {
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return false
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}
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certificates, err := certutil.ParseCertsPEM(certBytes)
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if err != nil {
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return false
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}
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if len(certificates) == 0 {
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return false
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}
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if !sets.NewString(certificates[0].DNSNames...).HasAll(sans.DNSNames...) {
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return true
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}
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ips := sets.NewString()
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for _, ip := range certificates[0].IPAddresses {
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ips.Insert(ip.String())
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}
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for _, ip := range sans.IPs {
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if !ips.Has(ip.String()) {
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return true
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}
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}
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return false
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}
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func createClientCertKey(regen bool, commonName string, organization []string, altNames *certutil.AltNames, extKeyUsage []x509.ExtKeyUsage, caCertFile, caKeyFile, certFile, keyFile string) (bool, error) {
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caBytes, err := ioutil.ReadFile(caCertFile)
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if err != nil {
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return false, err
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}
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pool := x509.NewCertPool()
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pool.AppendCertsFromPEM(caBytes)
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// check for certificate expiration
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if !regen {
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regen = expired(certFile, pool)
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}
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if !regen {
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regen = sansChanged(certFile, altNames)
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}
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if !regen {
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if exists(certFile, keyFile) {
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return false, nil
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}
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}
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caKeyBytes, err := ioutil.ReadFile(caKeyFile)
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if err != nil {
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return false, err
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}
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caKey, err := certutil.ParsePrivateKeyPEM(caKeyBytes)
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if err != nil {
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return false, err
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}
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caCert, err := certutil.ParseCertsPEM(caBytes)
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if err != nil {
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return false, err
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}
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keyBytes, _, err := certutil.LoadOrGenerateKeyFile(keyFile, regen)
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if err != nil {
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return false, err
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}
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key, err := certutil.ParsePrivateKeyPEM(keyBytes)
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if err != nil {
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return false, err
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}
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cfg := certutil.Config{
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CommonName: commonName,
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Organization: organization,
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Usages: extKeyUsage,
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}
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if altNames != nil {
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cfg.AltNames = *altNames
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}
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cert, err := certutil.NewSignedCert(cfg, key.(crypto.Signer), caCert[0], caKey.(crypto.Signer))
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if err != nil {
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return false, err
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}
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return true, certutil.WriteCert(certFile, append(certutil.EncodeCertPEM(cert), certutil.EncodeCertPEM(caCert[0])...))
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}
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func exists(files ...string) bool {
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for _, file := range files {
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if _, err := os.Stat(file); err != nil {
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return false
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}
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}
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return true
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}
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func genServiceAccount(runtime *config.ControlRuntime) error {
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_, keyErr := os.Stat(runtime.ServiceKey)
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if keyErr == nil {
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return nil
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}
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|
|
key, err := certutil.NewPrivateKey()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return certutil.WriteKey(runtime.ServiceKey, certutil.EncodePrivateKeyPEM(key))
|
|
}
|
|
|
|
func createSigningCertKey(prefix, certFile, keyFile string) (bool, error) {
|
|
if exists(certFile, keyFile) {
|
|
return false, nil
|
|
}
|
|
|
|
caKeyBytes, _, err := certutil.LoadOrGenerateKeyFile(keyFile, false)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
caKey, err := certutil.ParsePrivateKeyPEM(caKeyBytes)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
cfg := certutil.Config{
|
|
CommonName: fmt.Sprintf("%s-ca@%d", prefix, time.Now().Unix()),
|
|
}
|
|
|
|
cert, err := certutil.NewSelfSignedCACert(cfg, caKey.(crypto.Signer))
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
if err := certutil.WriteCert(certFile, certutil.EncodeCertPEM(cert)); err != nil {
|
|
return false, err
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
func expired(certFile string, pool *x509.CertPool) bool {
|
|
certBytes, err := ioutil.ReadFile(certFile)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
certificates, err := certutil.ParseCertsPEM(certBytes)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
_, err = certificates[0].Verify(x509.VerifyOptions{
|
|
Roots: pool,
|
|
KeyUsages: []x509.ExtKeyUsage{
|
|
x509.ExtKeyUsageAny,
|
|
},
|
|
})
|
|
if err != nil {
|
|
return true
|
|
}
|
|
return certutil.IsCertExpired(certificates[0], config.CertificateRenewDays)
|
|
}
|
|
|
|
func genEncryptionConfig(controlConfig *config.Control, runtime *config.ControlRuntime) error {
|
|
if !controlConfig.EncryptSecrets {
|
|
return nil
|
|
}
|
|
if s, err := os.Stat(runtime.EncryptionConfig); err == nil && s.Size() > 0 {
|
|
return nil
|
|
}
|
|
|
|
aescbcKey := make([]byte, aescbcKeySize, aescbcKeySize)
|
|
_, err := cryptorand.Read(aescbcKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
encodedKey := b64.StdEncoding.EncodeToString(aescbcKey)
|
|
|
|
encConfig := apiserverconfigv1.EncryptionConfiguration{
|
|
TypeMeta: metav1.TypeMeta{
|
|
Kind: "EncryptionConfiguration",
|
|
APIVersion: "apiserver.config.k8s.io/v1",
|
|
},
|
|
Resources: []apiserverconfigv1.ResourceConfiguration{
|
|
{
|
|
Resources: []string{"secrets"},
|
|
Providers: []apiserverconfigv1.ProviderConfiguration{
|
|
{
|
|
AESCBC: &apiserverconfigv1.AESConfiguration{
|
|
Keys: []apiserverconfigv1.Key{
|
|
{
|
|
Name: "aescbckey",
|
|
Secret: encodedKey,
|
|
},
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Identity: &apiserverconfigv1.IdentityConfiguration{},
|
|
},
|
|
},
|
|
},
|
|
},
|
|
}
|
|
jsonfile, err := json.Marshal(encConfig)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return ioutil.WriteFile(runtime.EncryptionConfig, jsonfile, 0600)
|
|
}
|