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317 lines
9.6 KiB
317 lines
9.6 KiB
package cert
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import (
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"bytes"
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"time"
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"github.com/erikdubbelboer/gspt"
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"github.com/k3s-io/k3s/pkg/bootstrap"
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"github.com/k3s-io/k3s/pkg/cli/cmds"
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"github.com/k3s-io/k3s/pkg/clientaccess"
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"github.com/k3s-io/k3s/pkg/daemons/config"
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"github.com/k3s-io/k3s/pkg/daemons/control/deps"
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"github.com/k3s-io/k3s/pkg/datadir"
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"github.com/k3s-io/k3s/pkg/server"
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"github.com/k3s-io/k3s/pkg/version"
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"github.com/otiai10/copy"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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const (
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adminService = "admin"
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apiServerService = "api-server"
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controllerManagerService = "controller-manager"
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schedulerService = "scheduler"
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etcdService = "etcd"
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programControllerService = "-controller"
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authProxyService = "auth-proxy"
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cloudControllerService = "cloud-controller"
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kubeletService = "kubelet"
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kubeProxyService = "kube-proxy"
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k3sServerService = "-server"
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)
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var services = []string{
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adminService,
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apiServerService,
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controllerManagerService,
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schedulerService,
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etcdService,
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version.Program + programControllerService,
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authProxyService,
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cloudControllerService,
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kubeletService,
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kubeProxyService,
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version.Program + k3sServerService,
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}
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func commandSetup(app *cli.Context, cfg *cmds.Server, sc *server.Config) (string, error) {
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gspt.SetProcTitle(os.Args[0])
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dataDir, err := datadir.Resolve(cfg.DataDir)
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if err != nil {
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return "", err
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}
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sc.ControlConfig.DataDir = filepath.Join(dataDir, "server")
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if cfg.Token == "" {
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fp := filepath.Join(sc.ControlConfig.DataDir, "token")
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tokenByte, err := os.ReadFile(fp)
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if err != nil {
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return "", err
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}
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cfg.Token = string(bytes.TrimRight(tokenByte, "\n"))
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}
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sc.ControlConfig.Token = cfg.Token
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sc.ControlConfig.Runtime = config.NewRuntime(nil)
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return dataDir, nil
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}
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func Rotate(app *cli.Context) error {
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if err := cmds.InitLogging(); err != nil {
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return err
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}
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return rotate(app, &cmds.ServerConfig)
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}
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func rotate(app *cli.Context, cfg *cmds.Server) error {
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var serverConfig server.Config
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dataDir, err := commandSetup(app, cfg, &serverConfig)
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if err != nil {
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return err
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}
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deps.CreateRuntimeCertFiles(&serverConfig.ControlConfig)
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if err := validateCertConfig(); err != nil {
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return err
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}
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agentDataDir := filepath.Join(dataDir, "agent")
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tlsBackupDir, err := backupCertificates(serverConfig.ControlConfig.DataDir, agentDataDir)
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if err != nil {
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return err
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}
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if len(cmds.ServicesList) == 0 {
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// detecting if the command is being run on an agent or server
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_, err := os.Stat(serverConfig.ControlConfig.DataDir)
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if err != nil {
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if !os.IsNotExist(err) {
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return err
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}
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logrus.Infof("Agent detected, rotating agent certificates")
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cmds.ServicesList = []string{
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kubeletService,
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kubeProxyService,
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version.Program + programControllerService,
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}
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} else {
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logrus.Infof("Server detected, rotating server certificates")
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cmds.ServicesList = []string{
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adminService,
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etcdService,
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apiServerService,
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controllerManagerService,
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cloudControllerService,
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schedulerService,
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version.Program + k3sServerService,
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version.Program + programControllerService,
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authProxyService,
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kubeletService,
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kubeProxyService,
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}
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}
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}
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fileList := []string{}
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for _, service := range cmds.ServicesList {
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logrus.Infof("Rotating certificates for %s service", service)
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switch service {
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case adminService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientAdminCert,
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serverConfig.ControlConfig.Runtime.ClientAdminKey)
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case apiServerService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientKubeAPICert,
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serverConfig.ControlConfig.Runtime.ClientKubeAPIKey,
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serverConfig.ControlConfig.Runtime.ServingKubeAPICert,
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serverConfig.ControlConfig.Runtime.ServingKubeAPIKey)
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case controllerManagerService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientControllerCert,
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serverConfig.ControlConfig.Runtime.ClientControllerKey)
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case schedulerService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientSchedulerCert,
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serverConfig.ControlConfig.Runtime.ClientSchedulerKey)
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case etcdService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientETCDCert,
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serverConfig.ControlConfig.Runtime.ClientETCDKey,
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serverConfig.ControlConfig.Runtime.ServerETCDCert,
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serverConfig.ControlConfig.Runtime.ServerETCDKey,
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serverConfig.ControlConfig.Runtime.PeerServerClientETCDCert,
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serverConfig.ControlConfig.Runtime.PeerServerClientETCDKey)
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case cloudControllerService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientCloudControllerCert,
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serverConfig.ControlConfig.Runtime.ClientCloudControllerKey)
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case version.Program + k3sServerService:
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dynamicListenerRegenFilePath := filepath.Join(serverConfig.ControlConfig.DataDir, "tls", "dynamic-cert-regenerate")
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if err := os.WriteFile(dynamicListenerRegenFilePath, []byte{}, 0600); err != nil {
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return err
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}
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logrus.Infof("Rotating dynamic listener certificate")
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case version.Program + programControllerService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientK3sControllerCert,
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serverConfig.ControlConfig.Runtime.ClientK3sControllerKey,
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filepath.Join(agentDataDir, "client-"+version.Program+"-controller.crt"),
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filepath.Join(agentDataDir, "client-"+version.Program+"-controller.key"))
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case authProxyService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientAuthProxyCert,
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serverConfig.ControlConfig.Runtime.ClientAuthProxyKey)
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case kubeletService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientKubeletKey,
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serverConfig.ControlConfig.Runtime.ServingKubeletKey,
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filepath.Join(agentDataDir, "client-kubelet.crt"),
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filepath.Join(agentDataDir, "client-kubelet.key"),
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filepath.Join(agentDataDir, "serving-kubelet.crt"),
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filepath.Join(agentDataDir, "serving-kubelet.key"))
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case kubeProxyService:
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fileList = append(fileList,
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serverConfig.ControlConfig.Runtime.ClientKubeProxyCert,
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serverConfig.ControlConfig.Runtime.ClientKubeProxyKey,
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filepath.Join(agentDataDir, "client-kube-proxy.crt"),
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filepath.Join(agentDataDir, "client-kube-proxy.key"))
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default:
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logrus.Fatalf("%s is not a recognized service", service)
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}
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}
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for _, file := range fileList {
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if err := os.Remove(file); err == nil {
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logrus.Debugf("file %s is deleted", file)
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}
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}
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logrus.Infof("Successfully backed up certificates for all services to path %s, please restart %s server or agent to rotate certificates", tlsBackupDir, version.Program)
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return nil
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}
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func copyFile(src, destDir string) error {
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_, err := os.Stat(src)
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if err == nil {
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input, err := os.ReadFile(src)
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if err != nil {
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return err
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}
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return os.WriteFile(filepath.Join(destDir, filepath.Base(src)), input, 0644)
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} else if errors.Is(err, os.ErrNotExist) {
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return nil
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}
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return err
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}
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func backupCertificates(serverDataDir, agentDataDir string) (string, error) {
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serverTLSDir := filepath.Join(serverDataDir, "tls")
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tlsBackupDir := filepath.Join(serverDataDir, "tls-"+strconv.Itoa(int(time.Now().Unix())))
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if _, err := os.Stat(serverTLSDir); err != nil {
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return "", err
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}
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if err := copy.Copy(serverTLSDir, tlsBackupDir); err != nil {
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return "", err
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}
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agentCerts := []string{
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filepath.Join(agentDataDir, "client-"+version.Program+"-controller.crt"),
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filepath.Join(agentDataDir, "client-"+version.Program+"-controller.key"),
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filepath.Join(agentDataDir, "client-kubelet.crt"),
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filepath.Join(agentDataDir, "client-kubelet.key"),
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filepath.Join(agentDataDir, "serving-kubelet.crt"),
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filepath.Join(agentDataDir, "serving-kubelet.key"),
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filepath.Join(agentDataDir, "client-kube-proxy.crt"),
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filepath.Join(agentDataDir, "client-kube-proxy.key"),
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}
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for _, cert := range agentCerts {
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if err := copyFile(cert, tlsBackupDir); err != nil {
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return "", err
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}
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}
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return tlsBackupDir, nil
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}
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func validService(svc string) bool {
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for _, service := range services {
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if svc == service {
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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 validateCertConfig() error {
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for _, s := range cmds.ServicesList {
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if !validService(s) {
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return errors.New("Service " + s + " is not recognized")
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}
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}
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return nil
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}
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func RotateCA(app *cli.Context) error {
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if err := cmds.InitLogging(); err != nil {
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return err
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}
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return rotateCA(app, &cmds.ServerConfig, &cmds.CertRotateCAConfig)
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}
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func rotateCA(app *cli.Context, cfg *cmds.Server, sync *cmds.CertRotateCA) error {
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var serverConfig server.Config
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_, err := commandSetup(app, cfg, &serverConfig)
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if err != nil {
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return err
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}
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info, err := clientaccess.ParseAndValidateToken(cmds.ServerConfig.ServerURL, serverConfig.ControlConfig.Token, clientaccess.WithUser("server"))
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if err != nil {
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return err
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}
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// Set up dummy server config for reading new bootstrap data from disk.
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tmpServer := &config.Control{
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Runtime: config.NewRuntime(nil),
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DataDir: filepath.Dir(sync.CACertPath),
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}
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deps.CreateRuntimeCertFiles(tmpServer)
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// Override these paths so that we don't get warnings when they don't exist, as the user is not expected to provide them.
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tmpServer.Runtime.PasswdFile = "/dev/null"
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tmpServer.Runtime.IPSECKey = "/dev/null"
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buf := &bytes.Buffer{}
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if err := bootstrap.ReadFromDisk(buf, &tmpServer.Runtime.ControlRuntimeBootstrap); err != nil {
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return err
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}
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url := fmt.Sprintf("/v1-%s/cert/cacerts?force=%t", version.Program, sync.Force)
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if err = info.Put(url, buf.Bytes()); err != nil {
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return errors.Wrap(err, "see server log for details")
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}
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fmt.Println("certificates saved to datastore")
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return nil
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}
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