mirror of
https://github.com/k3s-io/kubernetes.git
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Merge pull request #102297 from deads2k/ssh-tunnels
remove --ssh- options, deprecated 13 releases, that only work on GCE
This commit is contained in:
Kubernetes Prow Robot
GitHub
commit
74af3b712d
@ -276,23 +276,12 @@ function start-kube-apiserver {
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fi
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if [[ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]]; then
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params+=" --advertise-address=${MASTER_ADVERTISE_ADDRESS}"
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if [[ -n "${PROXY_SSH_USER:-}" ]]; then
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if [[ -n "${KUBE_API_SERVER_RUNASUSER:-}" && -n "${KUBE_API_SERVER_RUNASGROUP:-}" ]]; then
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chown -R "${KUBE_API_SERVER_RUNASUSER}":"${KUBE_API_SERVER_RUNASGROUP}" /etc/srv/sshproxy/
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fi
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params+=" --ssh-user=${PROXY_SSH_USER}"
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params+=" --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile"
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fi
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elif [[ -n "${PROJECT_ID:-}" && -n "${TOKEN_URL:-}" && -n "${TOKEN_BODY:-}" && -n "${NODE_NETWORK:-}" ]]; then
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local -r vm_external_ip=$(get-metadata-value "instance/network-interfaces/0/access-configs/0/external-ip")
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if [[ -n "${PROXY_SSH_USER:-}" ]]; then
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params+=" --advertise-address=${vm_external_ip}"
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if [[ -n "${KUBE_API_SERVER_RUNASUSER:-}" && -n "${KUBE_API_SERVER_RUNASGROUP:-}" ]]; then
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chown -R "${KUBE_API_SERVER_RUNASUSER}":"${KUBE_API_SERVER_RUNASGROUP}" /etc/srv/sshproxy/
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fi
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params+=" --advertise-address=${vm_external_ip}"
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params+=" --ssh-user=${PROXY_SSH_USER}"
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params+=" --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile"
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fi
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fi
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local webhook_authn_config_mount=""
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@ -75,8 +75,6 @@ type ServerRunOptions struct {
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APIServerServiceIP net.IP
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ServiceNodePortRange utilnet.PortRange
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SSHKeyfile string
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SSHUser string
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ProxyClientCertFile string
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ProxyClientKeyFile string
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@ -196,16 +194,6 @@ func (s *ServerRunOptions) Flags() (fss cliflag.NamedFlagSets) {
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"If true, install a /logs handler for the apiserver logs.")
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fs.MarkDeprecated("enable-logs-handler", "This flag will be removed in v1.19")
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// Deprecated in release 1.9
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fs.StringVar(&s.SSHUser, "ssh-user", s.SSHUser,
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"If non-empty, use secure SSH proxy to the nodes, using this user name")
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fs.MarkDeprecated("ssh-user", "This flag will be removed in a future version.")
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// Deprecated in release 1.9
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fs.StringVar(&s.SSHKeyfile, "ssh-keyfile", s.SSHKeyfile,
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"If non-empty, use secure SSH proxy to the nodes, using this user keyfile")
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fs.MarkDeprecated("ssh-keyfile", "This flag will be removed in a future version.")
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fs.Int64Var(&s.MaxConnectionBytesPerSec, "max-connection-bytes-per-sec", s.MaxConnectionBytesPerSec, ""+
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"If non-zero, throttle each user connection to this number of bytes/sec. "+
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"Currently only applies to long-running requests.")
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@ -26,7 +26,6 @@ import (
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"net/http"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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@ -55,7 +54,6 @@ import (
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clientgoclientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/util/keyutil"
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cloudprovider "k8s.io/cloud-provider"
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cliflag "k8s.io/component-base/cli/flag"
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"k8s.io/component-base/cli/globalflag"
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_ "k8s.io/component-base/metrics/prometheus/workqueue" // for workqueue metric registration
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@ -71,8 +69,6 @@ import (
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"k8s.io/kubernetes/pkg/capabilities"
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"k8s.io/kubernetes/pkg/controlplane"
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"k8s.io/kubernetes/pkg/controlplane/reconcilers"
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"k8s.io/kubernetes/pkg/controlplane/tunneler"
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"k8s.io/kubernetes/pkg/features"
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generatedopenapi "k8s.io/kubernetes/pkg/generated/openapi"
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"k8s.io/kubernetes/pkg/kubeapiserver"
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kubeapiserveradmission "k8s.io/kubernetes/pkg/kubeapiserver/admission"
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@ -186,19 +182,14 @@ func Run(completeOptions completedServerRunOptions, stopCh <-chan struct{}) erro
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// CreateServerChain creates the apiservers connected via delegation.
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func CreateServerChain(completedOptions completedServerRunOptions, stopCh <-chan struct{}) (*aggregatorapiserver.APIAggregator, error) {
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nodeTunneler, proxyTransport, err := CreateNodeDialer(completedOptions)
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if err != nil {
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return nil, err
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}
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kubeAPIServerConfig, serviceResolver, pluginInitializer, err := CreateKubeAPIServerConfig(completedOptions, nodeTunneler, proxyTransport)
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kubeAPIServerConfig, serviceResolver, pluginInitializer, err := CreateKubeAPIServerConfig(completedOptions)
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if err != nil {
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return nil, err
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}
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// If additional API servers are added, they should be gated.
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apiExtensionsConfig, err := createAPIExtensionsConfig(*kubeAPIServerConfig.GenericConfig, kubeAPIServerConfig.ExtraConfig.VersionedInformers, pluginInitializer, completedOptions.ServerRunOptions, completedOptions.MasterCount,
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serviceResolver, webhook.NewDefaultAuthenticationInfoResolverWrapper(proxyTransport, kubeAPIServerConfig.GenericConfig.EgressSelector, kubeAPIServerConfig.GenericConfig.LoopbackClientConfig))
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serviceResolver, webhook.NewDefaultAuthenticationInfoResolverWrapper(kubeAPIServerConfig.ExtraConfig.ProxyTransport, kubeAPIServerConfig.GenericConfig.EgressSelector, kubeAPIServerConfig.GenericConfig.LoopbackClientConfig))
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if err != nil {
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return nil, err
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}
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@ -213,7 +204,7 @@ func CreateServerChain(completedOptions completedServerRunOptions, stopCh <-chan
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}
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// aggregator comes last in the chain
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aggregatorConfig, err := createAggregatorConfig(*kubeAPIServerConfig.GenericConfig, completedOptions.ServerRunOptions, kubeAPIServerConfig.ExtraConfig.VersionedInformers, serviceResolver, proxyTransport, pluginInitializer)
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aggregatorConfig, err := createAggregatorConfig(*kubeAPIServerConfig.GenericConfig, completedOptions.ServerRunOptions, kubeAPIServerConfig.ExtraConfig.VersionedInformers, serviceResolver, kubeAPIServerConfig.ExtraConfig.ProxyTransport, pluginInitializer)
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if err != nil {
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return nil, err
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}
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@ -236,72 +227,27 @@ func CreateKubeAPIServer(kubeAPIServerConfig *controlplane.Config, delegateAPISe
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return kubeAPIServer, nil
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}
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// CreateNodeDialer creates the dialer infrastructure to connect to the nodes.
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func CreateNodeDialer(s completedServerRunOptions) (tunneler.Tunneler, *http.Transport, error) {
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// Setup nodeTunneler if needed
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var nodeTunneler tunneler.Tunneler
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// CreateProxyTransport creates the dialer infrastructure to connect to the nodes.
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func CreateProxyTransport() *http.Transport {
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var proxyDialerFn utilnet.DialFunc
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if len(s.SSHUser) > 0 {
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// Get ssh key distribution func, if supported
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var installSSHKey tunneler.InstallSSHKey
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if utilfeature.DefaultFeatureGate.Enabled(features.DisableCloudProviders) && cloudprovider.IsDeprecatedInternal(s.CloudProvider.CloudProvider) {
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cloudprovider.DisableWarningForProvider(s.CloudProvider.CloudProvider)
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return nil, nil, fmt.Errorf("cloud provider %q and ssh-user %q was specified, but built-in cloud providers are disabled. "+
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"Please set --cloud-provider=external and use an external network proxy, see https://github.com/kubernetes-sigs/apiserver-network-proxy",
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s.CloudProvider.CloudProvider, s.SSHUser)
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}
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cloudprovider.DeprecationWarningForProvider(s.CloudProvider.CloudProvider)
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cloud, err := cloudprovider.InitCloudProvider(s.CloudProvider.CloudProvider, s.CloudProvider.CloudConfigFile)
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if err != nil {
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return nil, nil, fmt.Errorf("cloud provider could not be initialized: %v", err)
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}
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if cloud != nil {
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if instances, supported := cloud.Instances(); supported {
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installSSHKey = instances.AddSSHKeyToAllInstances
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}
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}
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if s.KubeletConfig.Port == 0 {
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return nil, nil, fmt.Errorf("must enable kubelet port if proxy ssh-tunneling is specified")
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}
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if s.KubeletConfig.ReadOnlyPort == 0 {
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return nil, nil, fmt.Errorf("must enable kubelet readonly port if proxy ssh-tunneling is specified")
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}
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// Set up the nodeTunneler
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// TODO(cjcullen): If we want this to handle per-kubelet ports or other
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// kubelet listen-addresses, we need to plumb through options.
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healthCheckPath := &url.URL{
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Scheme: "http",
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Host: net.JoinHostPort("127.0.0.1", strconv.FormatUint(uint64(s.KubeletConfig.ReadOnlyPort), 10)),
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Path: "healthz",
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}
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nodeTunneler = tunneler.New(s.SSHUser, s.SSHKeyfile, healthCheckPath, installSSHKey)
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// Use the nodeTunneler's dialer when proxying to pods, services, and nodes
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proxyDialerFn = nodeTunneler.Dial
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}
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// Proxying to pods and services is IP-based... don't expect to be able to verify the hostname
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proxyTLSClientConfig := &tls.Config{InsecureSkipVerify: true}
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proxyTransport := utilnet.SetTransportDefaults(&http.Transport{
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DialContext: proxyDialerFn,
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TLSClientConfig: proxyTLSClientConfig,
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})
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return nodeTunneler, proxyTransport, nil
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return proxyTransport
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}
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// CreateKubeAPIServerConfig creates all the resources for running the API server, but runs none of them
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func CreateKubeAPIServerConfig(
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s completedServerRunOptions,
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nodeTunneler tunneler.Tunneler,
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proxyTransport *http.Transport,
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) (
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func CreateKubeAPIServerConfig(s completedServerRunOptions) (
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*controlplane.Config,
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aggregatorapiserver.ServiceResolver,
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[]admission.PluginInitializer,
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error,
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) {
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proxyTransport := CreateProxyTransport()
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genericConfig, versionedInformers, serviceResolver, pluginInitializers, admissionPostStartHook, storageFactory, err := buildGenericConfig(s.ServerRunOptions, proxyTransport)
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if err != nil {
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return nil, nil, nil, err
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@ -339,8 +285,6 @@ func CreateKubeAPIServerConfig(
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EnableLogsSupport: s.EnableLogsHandler,
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ProxyTransport: proxyTransport,
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Tunneler: nodeTunneler,
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ServiceIPRange: s.PrimaryServiceClusterIPRange,
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APIServerServiceIP: s.APIServerServiceIP,
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SecondaryServiceIPRange: s.SecondaryServiceClusterIPRange,
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@ -386,10 +330,6 @@ func CreateKubeAPIServerConfig(
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return nil, nil, nil, err
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}
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if nodeTunneler != nil {
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// Use the nodeTunneler's dialer to connect to the kubelet
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config.ExtraConfig.KubeletClientConfig.Dial = nodeTunneler.Dial
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}
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if config.GenericConfig.EgressSelector != nil {
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// Use the config.GenericConfig.EgressSelector lookup to find the dialer to connect to the kubelet
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config.ExtraConfig.KubeletClientConfig.Lookup = config.GenericConfig.EgressSelector.Lookup
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@ -75,7 +75,6 @@ import (
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"k8s.io/apiserver/pkg/registry/generic"
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genericapiserver "k8s.io/apiserver/pkg/server"
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"k8s.io/apiserver/pkg/server/dynamiccertificates"
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"k8s.io/apiserver/pkg/server/healthz"
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serverstorage "k8s.io/apiserver/pkg/server/storage"
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storagefactory "k8s.io/apiserver/pkg/storage/storagebackend/factory"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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@ -90,7 +89,6 @@ import (
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"k8s.io/kubernetes/pkg/controlplane/controller/apiserverleasegc"
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"k8s.io/kubernetes/pkg/controlplane/controller/clusterauthenticationtrust"
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"k8s.io/kubernetes/pkg/controlplane/reconcilers"
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"k8s.io/kubernetes/pkg/controlplane/tunneler"
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kubeoptions "k8s.io/kubernetes/pkg/kubeapiserver/options"
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kubeletclient "k8s.io/kubernetes/pkg/kubelet/client"
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"k8s.io/kubernetes/pkg/routes"
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@ -146,10 +144,8 @@ type ExtraConfig struct {
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EventTTL time.Duration
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KubeletClientConfig kubeletclient.KubeletClientConfig
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// Used to start and monitor tunneling
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Tunneler tunneler.Tunneler
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EnableLogsSupport bool
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ProxyTransport http.RoundTripper
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ProxyTransport *http.Transport
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// Values to build the IP addresses used by discovery
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// The range of IPs to be assigned to services with type=ClusterIP or greater
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@ -450,10 +446,6 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
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return nil, err
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}
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if c.ExtraConfig.Tunneler != nil {
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m.installTunneler(c.ExtraConfig.Tunneler, corev1client.NewForConfigOrDie(c.GenericConfig.LoopbackClientConfig).Nodes())
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}
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m.GenericAPIServer.AddPostStartHookOrDie("start-cluster-authentication-info-controller", func(hookContext genericapiserver.PostStartHookContext) error {
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kubeClient, err := kubernetes.NewForConfig(hookContext.LoopbackClientConfig)
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if err != nil {
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@ -551,14 +543,6 @@ func (m *Instance) InstallLegacyAPI(c *completedConfig, restOptionsGetter generi
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return nil
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}
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func (m *Instance) installTunneler(nodeTunneler tunneler.Tunneler, nodeClient corev1client.NodeInterface) {
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nodeTunneler.Run(nodeAddressProvider{nodeClient}.externalAddresses)
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err := m.GenericAPIServer.AddHealthChecks(healthz.NamedCheck("SSH Tunnel Check", tunneler.TunnelSyncHealthChecker(nodeTunneler)))
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if err != nil {
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klog.Errorf("Failed adding ssh tunnel health check %v\n", err)
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}
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}
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// RESTStorageProvider is a factory type for REST storage.
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type RESTStorageProvider interface {
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GroupName() string
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@ -1,231 +0,0 @@
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/*
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Copyright 2015 The Kubernetes Authors.
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|
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Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
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You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
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|
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package tunneler
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|
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import (
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"context"
|
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"fmt"
|
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"io/ioutil"
|
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"net"
|
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"net/http"
|
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"net/url"
|
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"os"
|
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"sync/atomic"
|
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"time"
|
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|
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"k8s.io/apimachinery/pkg/util/clock"
|
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"k8s.io/apimachinery/pkg/util/wait"
|
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"k8s.io/klog/v2"
|
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"k8s.io/kubernetes/pkg/ssh"
|
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utilpath "k8s.io/utils/path"
|
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)
|
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|
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type InstallSSHKey func(ctx context.Context, user string, data []byte) error
|
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|
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type AddressFunc func() (addresses []string, err error)
|
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|
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type Tunneler interface {
|
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Run(AddressFunc)
|
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Stop()
|
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Dial(ctx context.Context, net, addr string) (net.Conn, error)
|
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SecondsSinceSync() int64
|
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SecondsSinceSSHKeySync() int64
|
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}
|
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|
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// TunnelSyncHealthChecker returns a health func that indicates if a tunneler is healthy.
|
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// It's compatible with healthz.NamedCheck
|
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func TunnelSyncHealthChecker(tunneler Tunneler) func(req *http.Request) error {
|
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return func(req *http.Request) error {
|
||||
if tunneler == nil {
|
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return nil
|
||||
}
|
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lag := tunneler.SecondsSinceSync()
|
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if lag > 600 {
|
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return fmt.Errorf("tunnel sync is taking too long: %d", lag)
|
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}
|
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sshKeyLag := tunneler.SecondsSinceSSHKeySync()
|
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// Since we are syncing ssh-keys every 5 minutes, the allowed
|
||||
// lag since last sync should be more than 2x higher than that
|
||||
// to allow for single failure, which can always happen.
|
||||
// For now set it to 3x, which is 15 minutes.
|
||||
// For more details see: http://pr.k8s.io/59347
|
||||
if sshKeyLag > 900 {
|
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return fmt.Errorf("SSHKey sync is taking too long: %d", sshKeyLag)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
type SSHTunneler struct {
|
||||
// Important: Since these two int64 fields are using sync/atomic, they have to be at the top of the struct due to a bug on 32-bit platforms
|
||||
// See: https://golang.org/pkg/sync/atomic/ for more information
|
||||
lastSync int64 // Seconds since Epoch
|
||||
lastSSHKeySync int64 // Seconds since Epoch
|
||||
|
||||
SSHUser string
|
||||
SSHKeyfile string
|
||||
InstallSSHKey InstallSSHKey
|
||||
HealthCheckURL *url.URL
|
||||
|
||||
tunnels *ssh.SSHTunnelList
|
||||
clock clock.Clock
|
||||
|
||||
getAddresses AddressFunc
|
||||
stopChan chan struct{}
|
||||
}
|
||||
|
||||
func New(sshUser, sshKeyfile string, healthCheckURL *url.URL, installSSHKey InstallSSHKey) Tunneler {
|
||||
return &SSHTunneler{
|
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SSHUser: sshUser,
|
||||
SSHKeyfile: sshKeyfile,
|
||||
InstallSSHKey: installSSHKey,
|
||||
HealthCheckURL: healthCheckURL,
|
||||
clock: clock.RealClock{},
|
||||
}
|
||||
}
|
||||
|
||||
// Run establishes tunnel loops and returns
|
||||
func (c *SSHTunneler) Run(getAddresses AddressFunc) {
|
||||
if c.stopChan != nil {
|
||||
return
|
||||
}
|
||||
c.stopChan = make(chan struct{})
|
||||
|
||||
// Save the address getter
|
||||
if getAddresses != nil {
|
||||
c.getAddresses = getAddresses
|
||||
}
|
||||
|
||||
// Usernames are capped @ 32
|
||||
if len(c.SSHUser) > 32 {
|
||||
klog.Warning("SSH User is too long, truncating to 32 chars")
|
||||
c.SSHUser = c.SSHUser[0:32]
|
||||
}
|
||||
klog.Infof("Setting up proxy: %s %s", c.SSHUser, c.SSHKeyfile)
|
||||
|
||||
// public keyfile is written last, so check for that.
|
||||
publicKeyFile := c.SSHKeyfile + ".pub"
|
||||
exists, err := utilpath.Exists(utilpath.CheckFollowSymlink, publicKeyFile)
|
||||
if err != nil {
|
||||
klog.Errorf("Error detecting if key exists: %v", err)
|
||||
} else if !exists {
|
||||
klog.Infof("Key doesn't exist, attempting to create")
|
||||
if err := generateSSHKey(c.SSHKeyfile, publicKeyFile); err != nil {
|
||||
klog.Errorf("Failed to create key pair: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
c.tunnels = ssh.NewSSHTunnelList(c.SSHUser, c.SSHKeyfile, c.HealthCheckURL, c.stopChan)
|
||||
// Sync loop to ensure that the SSH key has been installed.
|
||||
c.lastSSHKeySync = c.clock.Now().Unix()
|
||||
c.installSSHKeySyncLoop(c.SSHUser, publicKeyFile)
|
||||
// Sync tunnelList w/ nodes.
|
||||
c.lastSync = c.clock.Now().Unix()
|
||||
c.nodesSyncLoop()
|
||||
}
|
||||
|
||||
// Stop gracefully shuts down the tunneler
|
||||
func (c *SSHTunneler) Stop() {
|
||||
if c.stopChan != nil {
|
||||
close(c.stopChan)
|
||||
c.stopChan = nil
|
||||
}
|
||||
}
|
||||
|
||||
func (c *SSHTunneler) Dial(ctx context.Context, net, addr string) (net.Conn, error) {
|
||||
return c.tunnels.Dial(ctx, net, addr)
|
||||
}
|
||||
|
||||
func (c *SSHTunneler) SecondsSinceSync() int64 {
|
||||
now := c.clock.Now().Unix()
|
||||
then := atomic.LoadInt64(&c.lastSync)
|
||||
return now - then
|
||||
}
|
||||
|
||||
func (c *SSHTunneler) SecondsSinceSSHKeySync() int64 {
|
||||
now := c.clock.Now().Unix()
|
||||
then := atomic.LoadInt64(&c.lastSSHKeySync)
|
||||
return now - then
|
||||
}
|
||||
|
||||
func (c *SSHTunneler) installSSHKeySyncLoop(user, publicKeyfile string) {
|
||||
go wait.Until(func() {
|
||||
if c.InstallSSHKey == nil {
|
||||
klog.Error("Won't attempt to install ssh key: InstallSSHKey function is nil")
|
||||
return
|
||||
}
|
||||
key, err := ssh.ParsePublicKeyFromFile(publicKeyfile)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to load public key: %v", err)
|
||||
return
|
||||
}
|
||||
keyData, err := ssh.EncodeSSHKey(key)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to encode public key: %v", err)
|
||||
return
|
||||
}
|
||||
if err := c.InstallSSHKey(context.TODO(), user, keyData); err != nil {
|
||||
klog.Errorf("Failed to install ssh key: %v", err)
|
||||
return
|
||||
}
|
||||
atomic.StoreInt64(&c.lastSSHKeySync, c.clock.Now().Unix())
|
||||
}, 5*time.Minute, c.stopChan)
|
||||
}
|
||||
|
||||
// nodesSyncLoop lists nodes every 15 seconds, calling Update() on the TunnelList
|
||||
// each time (Update() is a noop if no changes are necessary).
|
||||
func (c *SSHTunneler) nodesSyncLoop() {
|
||||
// TODO (cjcullen) make this watch.
|
||||
go wait.Until(func() {
|
||||
addrs, err := c.getAddresses()
|
||||
klog.V(4).Infof("Calling update w/ addrs: %v", addrs)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to getAddresses: %v", err)
|
||||
}
|
||||
c.tunnels.Update(addrs)
|
||||
atomic.StoreInt64(&c.lastSync, c.clock.Now().Unix())
|
||||
}, 15*time.Second, c.stopChan)
|
||||
}
|
||||
|
||||
func generateSSHKey(privateKeyfile, publicKeyfile string) error {
|
||||
private, public, err := ssh.GenerateKey(2048)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
// If private keyfile already exists, we must have only made it halfway
|
||||
// through last time, so delete it.
|
||||
exists, err := utilpath.Exists(utilpath.CheckFollowSymlink, privateKeyfile)
|
||||
if err != nil {
|
||||
klog.Errorf("Error detecting if private key exists: %v", err)
|
||||
} else if exists {
|
||||
klog.Infof("Private key exists, but public key does not")
|
||||
if err := os.Remove(privateKeyfile); err != nil {
|
||||
klog.Errorf("Failed to remove stale private key: %v", err)
|
||||
}
|
||||
}
|
||||
if err := ioutil.WriteFile(privateKeyfile, ssh.EncodePrivateKey(private), 0600); err != nil {
|
||||
return err
|
||||
}
|
||||
publicKeyBytes, err := ssh.EncodePublicKey(public)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if err := ioutil.WriteFile(publicKeyfile+".tmp", publicKeyBytes, 0600); err != nil {
|
||||
return err
|
||||
}
|
||||
return os.Rename(publicKeyfile+".tmp", publicKeyfile)
|
||||
}
|
||||
@ -1,163 +0,0 @@
|
||||
/*
|
||||
Copyright 2015 The Kubernetes Authors.
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
|
||||
package tunneler
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"net"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
|
||||
"k8s.io/apimachinery/pkg/util/clock"
|
||||
)
|
||||
|
||||
// TestSecondsSinceSync verifies that proper results are returned
|
||||
// when checking the time between syncs
|
||||
func TestSecondsSinceSync(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
lastSync int64
|
||||
clock *clock.FakeClock
|
||||
want int64
|
||||
}{
|
||||
{
|
||||
name: "Nano Second. No difference",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 1, 1, 1, 1, 2, time.UTC)),
|
||||
want: int64(0),
|
||||
},
|
||||
{
|
||||
name: "Second",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 1, 1, 1, 2, 1, time.UTC)),
|
||||
want: int64(1),
|
||||
},
|
||||
{
|
||||
name: "Minute",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 1, 1, 2, 1, 1, time.UTC)),
|
||||
want: int64(60),
|
||||
},
|
||||
{
|
||||
name: "Hour",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 1, 2, 1, 1, 1, time.UTC)),
|
||||
want: int64(3600),
|
||||
},
|
||||
{
|
||||
name: "Day",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 2, 1, 1, 1, 1, time.UTC)),
|
||||
want: int64(86400),
|
||||
},
|
||||
{
|
||||
name: "Month",
|
||||
lastSync: time.Date(2015, time.January, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.February, 1, 1, 1, 1, 1, time.UTC)),
|
||||
want: int64(2678400),
|
||||
},
|
||||
{
|
||||
name: "Future Month. Should be -Month",
|
||||
lastSync: time.Date(2015, time.February, 1, 1, 1, 1, 1, time.UTC).Unix(),
|
||||
clock: clock.NewFakeClock(time.Date(2015, time.January, 1, 1, 1, 1, 2, time.UTC)),
|
||||
want: int64(-2678400),
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
tunneler := &SSHTunneler{}
|
||||
assert := assert.New(t)
|
||||
tunneler.lastSync = tt.lastSync
|
||||
tunneler.clock = tt.clock
|
||||
assert.Equal(int64(tt.want), tunneler.SecondsSinceSync())
|
||||
})
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// generateTempFile creates a temporary file path
|
||||
func generateTempFilePath(prefix string) string {
|
||||
tmpPath, _ := filepath.Abs(fmt.Sprintf("%s/%s-%d", os.TempDir(), prefix, time.Now().Unix()))
|
||||
return tmpPath
|
||||
}
|
||||
|
||||
// TestGenerateSSHKey verifies that SSH key generation does indeed
|
||||
// generate keys even with keys already exist.
|
||||
func TestGenerateSSHKey(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
privateKey := generateTempFilePath("private")
|
||||
publicKey := generateTempFilePath("public")
|
||||
|
||||
// Make sure we have no test keys laying around
|
||||
os.Remove(privateKey)
|
||||
os.Remove(publicKey)
|
||||
|
||||
// Pass case: Sunny day case
|
||||
err := generateSSHKey(privateKey, publicKey)
|
||||
assert.NoError(err, "generateSSHKey should not have retuend an error: %s", err)
|
||||
|
||||
// Pass case: PrivateKey exists test case
|
||||
os.Remove(publicKey)
|
||||
err = generateSSHKey(privateKey, publicKey)
|
||||
assert.NoError(err, "generateSSHKey should not have retuend an error: %s", err)
|
||||
|
||||
// Pass case: PublicKey exists test case
|
||||
os.Remove(privateKey)
|
||||
err = generateSSHKey(privateKey, publicKey)
|
||||
assert.NoError(err, "generateSSHKey should not have retuend an error: %s", err)
|
||||
|
||||
// Make sure we have no test keys laying around
|
||||
os.Remove(privateKey)
|
||||
os.Remove(publicKey)
|
||||
|
||||
// TODO: testing error cases where the file can not be removed?
|
||||
}
|
||||
|
||||
type FakeTunneler struct {
|
||||
SecondsSinceSyncValue int64
|
||||
SecondsSinceSSHKeySyncValue int64
|
||||
}
|
||||
|
||||
func (t *FakeTunneler) Run(AddressFunc) {}
|
||||
func (t *FakeTunneler) Stop() {}
|
||||
func (t *FakeTunneler) Dial(ctx context.Context, net, addr string) (net.Conn, error) { return nil, nil }
|
||||
func (t *FakeTunneler) SecondsSinceSync() int64 { return t.SecondsSinceSyncValue }
|
||||
func (t *FakeTunneler) SecondsSinceSSHKeySync() int64 { return t.SecondsSinceSSHKeySyncValue }
|
||||
|
||||
// TestIsTunnelSyncHealthy verifies that the 600 second lag test
|
||||
// is honored.
|
||||
func TestIsTunnelSyncHealthy(t *testing.T) {
|
||||
tunneler := &FakeTunneler{}
|
||||
|
||||
// Pass case: 540 second lag
|
||||
tunneler.SecondsSinceSyncValue = 540
|
||||
healthFn := TunnelSyncHealthChecker(tunneler)
|
||||
err := healthFn(nil)
|
||||
assert.NoError(t, err, "IsTunnelSyncHealthy() should not have returned an error.")
|
||||
|
||||
// Fail case: 720 second lag
|
||||
tunneler.SecondsSinceSyncValue = 720
|
||||
err = healthFn(nil)
|
||||
assert.Error(t, err, "IsTunnelSyncHealthy() should have returned an error.")
|
||||
}
|
||||
514
pkg/ssh/ssh.go
514
pkg/ssh/ssh.go
@ -1,514 +0,0 @@
|
||||
/*
|
||||
Copyright 2015 The Kubernetes Authors.
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
|
||||
// WARNING: DO NOT add new use-caes to this package as it is deprecated and slated for deletion.
|
||||
|
||||
package ssh
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"crypto/rand"
|
||||
"crypto/rsa"
|
||||
"crypto/tls"
|
||||
"crypto/x509"
|
||||
"encoding/pem"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
mathrand "math/rand"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"os"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"golang.org/x/crypto/ssh"
|
||||
|
||||
utilnet "k8s.io/apimachinery/pkg/util/net"
|
||||
"k8s.io/apimachinery/pkg/util/runtime"
|
||||
"k8s.io/apimachinery/pkg/util/wait"
|
||||
"k8s.io/component-base/metrics"
|
||||
"k8s.io/component-base/metrics/legacyregistry"
|
||||
"k8s.io/klog/v2"
|
||||
)
|
||||
|
||||
/*
|
||||
* By default, all the following metrics are defined as falling under
|
||||
* ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/1209-metrics-stability/kubernetes-control-plane-metrics-stability.md#stability-classes)
|
||||
*
|
||||
* Promoting the stability level of the metric is a responsibility of the component owner, since it
|
||||
* involves explicitly acknowledging support for the metric across multiple releases, in accordance with
|
||||
* the metric stability policy.
|
||||
*/
|
||||
var (
|
||||
tunnelOpenCounter = metrics.NewCounter(
|
||||
&metrics.CounterOpts{
|
||||
Name: "ssh_tunnel_open_count",
|
||||
Help: "Counter of ssh tunnel total open attempts",
|
||||
StabilityLevel: metrics.ALPHA,
|
||||
},
|
||||
)
|
||||
tunnelOpenFailCounter = metrics.NewCounter(
|
||||
&metrics.CounterOpts{
|
||||
Name: "ssh_tunnel_open_fail_count",
|
||||
Help: "Counter of ssh tunnel failed open attempts",
|
||||
StabilityLevel: metrics.ALPHA,
|
||||
},
|
||||
)
|
||||
)
|
||||
|
||||
func init() {
|
||||
legacyregistry.MustRegister(tunnelOpenCounter)
|
||||
legacyregistry.MustRegister(tunnelOpenFailCounter)
|
||||
}
|
||||
|
||||
// TODO: Unit tests for this code, we can spin up a test SSH server with instructions here:
|
||||
// https://godoc.org/golang.org/x/crypto/ssh#ServerConn
|
||||
type sshTunnel struct {
|
||||
Config *ssh.ClientConfig
|
||||
Host string
|
||||
SSHPort string
|
||||
client *ssh.Client
|
||||
}
|
||||
|
||||
func makeSSHTunnel(user string, signer ssh.Signer, host string) (*sshTunnel, error) {
|
||||
config := ssh.ClientConfig{
|
||||
User: user,
|
||||
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
|
||||
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
|
||||
}
|
||||
return &sshTunnel{
|
||||
Config: &config,
|
||||
Host: host,
|
||||
SSHPort: "22",
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (s *sshTunnel) Open() error {
|
||||
var err error
|
||||
s.client, err = realTimeoutDialer.Dial("tcp", net.JoinHostPort(s.Host, s.SSHPort), s.Config)
|
||||
tunnelOpenCounter.Inc()
|
||||
if err != nil {
|
||||
tunnelOpenFailCounter.Inc()
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (s *sshTunnel) Dial(ctx context.Context, network, address string) (net.Conn, error) {
|
||||
if s.client == nil {
|
||||
return nil, errors.New("tunnel is not opened.")
|
||||
}
|
||||
// This Dial method does not allow to pass a context unfortunately
|
||||
return s.client.Dial(network, address)
|
||||
}
|
||||
|
||||
func (s *sshTunnel) Close() error {
|
||||
if s.client == nil {
|
||||
return errors.New("Cannot close tunnel. Tunnel was not opened.")
|
||||
}
|
||||
if err := s.client.Close(); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Interface to allow mocking of ssh.Dial, for testing SSH
|
||||
type sshDialer interface {
|
||||
Dial(network, addr string, config *ssh.ClientConfig) (*ssh.Client, error)
|
||||
}
|
||||
|
||||
// Real implementation of sshDialer
|
||||
type realSSHDialer struct{}
|
||||
|
||||
var _ sshDialer = &realSSHDialer{}
|
||||
|
||||
func (d *realSSHDialer) Dial(network, addr string, config *ssh.ClientConfig) (*ssh.Client, error) {
|
||||
conn, err := net.DialTimeout(network, addr, config.Timeout)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
conn.SetReadDeadline(time.Now().Add(30 * time.Second))
|
||||
c, chans, reqs, err := ssh.NewClientConn(conn, addr, config)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
conn.SetReadDeadline(time.Time{})
|
||||
return ssh.NewClient(c, chans, reqs), nil
|
||||
}
|
||||
|
||||
// timeoutDialer wraps an sshDialer with a timeout around Dial(). The golang
|
||||
// ssh library can hang indefinitely inside the Dial() call (see issue #23835).
|
||||
// Wrapping all Dial() calls with a conservative timeout provides safety against
|
||||
// getting stuck on that.
|
||||
type timeoutDialer struct {
|
||||
dialer sshDialer
|
||||
timeout time.Duration
|
||||
}
|
||||
|
||||
// 150 seconds is longer than the underlying default TCP backoff delay (127
|
||||
// seconds). This timeout is only intended to catch otherwise uncaught hangs.
|
||||
const sshDialTimeout = 150 * time.Second
|
||||
|
||||
var realTimeoutDialer sshDialer = &timeoutDialer{&realSSHDialer{}, sshDialTimeout}
|
||||
|
||||
func (d *timeoutDialer) Dial(network, addr string, config *ssh.ClientConfig) (*ssh.Client, error) {
|
||||
config.Timeout = d.timeout
|
||||
return d.dialer.Dial(network, addr, config)
|
||||
}
|
||||
|
||||
// RunSSHCommand returns the stdout, stderr, and exit code from running cmd on
|
||||
// host as specific user, along with any SSH-level error.
|
||||
// If user=="", it will default (like SSH) to os.Getenv("USER")
|
||||
func RunSSHCommand(cmd, user, host string, signer ssh.Signer) (string, string, int, error) {
|
||||
return runSSHCommand(realTimeoutDialer, cmd, user, host, signer, true)
|
||||
}
|
||||
|
||||
// Internal implementation of runSSHCommand, for testing
|
||||
func runSSHCommand(dialer sshDialer, cmd, user, host string, signer ssh.Signer, retry bool) (string, string, int, error) {
|
||||
if user == "" {
|
||||
user = os.Getenv("USER")
|
||||
}
|
||||
// Setup the config, dial the server, and open a session.
|
||||
config := &ssh.ClientConfig{
|
||||
User: user,
|
||||
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
|
||||
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
|
||||
}
|
||||
client, err := dialer.Dial("tcp", host, config)
|
||||
if err != nil && retry {
|
||||
err = wait.Poll(5*time.Second, 20*time.Second, func() (bool, error) {
|
||||
fmt.Printf("error dialing %s@%s: '%v', retrying\n", user, host, err)
|
||||
if client, err = dialer.Dial("tcp", host, config); err != nil {
|
||||
return false, err
|
||||
}
|
||||
return true, nil
|
||||
})
|
||||
}
|
||||
if err != nil {
|
||||
return "", "", 0, fmt.Errorf("error getting SSH client to %s@%s: '%v'", user, host, err)
|
||||
}
|
||||
defer client.Close()
|
||||
session, err := client.NewSession()
|
||||
if err != nil {
|
||||
return "", "", 0, fmt.Errorf("error creating session to %s@%s: '%v'", user, host, err)
|
||||
}
|
||||
defer session.Close()
|
||||
|
||||
// Run the command.
|
||||
code := 0
|
||||
var bout, berr bytes.Buffer
|
||||
session.Stdout, session.Stderr = &bout, &berr
|
||||
if err = session.Run(cmd); err != nil {
|
||||
// Check whether the command failed to run or didn't complete.
|
||||
if exiterr, ok := err.(*ssh.ExitError); ok {
|
||||
// If we got an ExitError and the exit code is nonzero, we'll
|
||||
// consider the SSH itself successful (just that the command run
|
||||
// errored on the host).
|
||||
if code = exiterr.ExitStatus(); code != 0 {
|
||||
err = nil
|
||||
}
|
||||
} else {
|
||||
// Some other kind of error happened (e.g. an IOError); consider the
|
||||
// SSH unsuccessful.
|
||||
err = fmt.Errorf("failed running `%s` on %s@%s: '%v'", cmd, user, host, err)
|
||||
}
|
||||
}
|
||||
return bout.String(), berr.String(), code, err
|
||||
}
|
||||
|
||||
func MakePrivateKeySignerFromFile(key string) (ssh.Signer, error) {
|
||||
// Create an actual signer.
|
||||
buffer, err := ioutil.ReadFile(key)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error reading SSH key %s: '%v'", key, err)
|
||||
}
|
||||
return MakePrivateKeySignerFromBytes(buffer)
|
||||
}
|
||||
|
||||
func MakePrivateKeySignerFromBytes(buffer []byte) (ssh.Signer, error) {
|
||||
signer, err := ssh.ParsePrivateKey(buffer)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error parsing SSH key: '%v'", err)
|
||||
}
|
||||
return signer, nil
|
||||
}
|
||||
|
||||
func ParsePublicKeyFromFile(keyFile string) (*rsa.PublicKey, error) {
|
||||
buffer, err := ioutil.ReadFile(keyFile)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error reading SSH key %s: '%v'", keyFile, err)
|
||||
}
|
||||
keyBlock, _ := pem.Decode(buffer)
|
||||
if keyBlock == nil {
|
||||
return nil, fmt.Errorf("error parsing SSH key %s: 'invalid PEM format'", keyFile)
|
||||
}
|
||||
key, err := x509.ParsePKIXPublicKey(keyBlock.Bytes)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error parsing SSH key %s: '%v'", keyFile, err)
|
||||
}
|
||||
rsaKey, ok := key.(*rsa.PublicKey)
|
||||
if !ok {
|
||||
return nil, fmt.Errorf("SSH key could not be parsed as rsa public key")
|
||||
}
|
||||
return rsaKey, nil
|
||||
}
|
||||
|
||||
type tunnel interface {
|
||||
Open() error
|
||||
Close() error
|
||||
Dial(ctx context.Context, network, address string) (net.Conn, error)
|
||||
}
|
||||
|
||||
type sshTunnelEntry struct {
|
||||
Address string
|
||||
Tunnel tunnel
|
||||
}
|
||||
|
||||
type sshTunnelCreator interface {
|
||||
newSSHTunnel(user, keyFile, host string) (tunnel, error)
|
||||
}
|
||||
|
||||
type realTunnelCreator struct{}
|
||||
|
||||
func (*realTunnelCreator) newSSHTunnel(user, keyFile, host string) (tunnel, error) {
|
||||
signer, err := MakePrivateKeySignerFromFile(keyFile)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return makeSSHTunnel(user, signer, host)
|
||||
}
|
||||
|
||||
type SSHTunnelList struct {
|
||||
entries []sshTunnelEntry
|
||||
adding map[string]bool
|
||||
tunnelCreator sshTunnelCreator
|
||||
tunnelsLock sync.Mutex
|
||||
|
||||
user string
|
||||
keyfile string
|
||||
healthCheckURL *url.URL
|
||||
}
|
||||
|
||||
func NewSSHTunnelList(user, keyfile string, healthCheckURL *url.URL, stopChan chan struct{}) *SSHTunnelList {
|
||||
l := &SSHTunnelList{
|
||||
adding: make(map[string]bool),
|
||||
tunnelCreator: &realTunnelCreator{},
|
||||
user: user,
|
||||
keyfile: keyfile,
|
||||
healthCheckURL: healthCheckURL,
|
||||
}
|
||||
healthCheckPoll := 1 * time.Minute
|
||||
go wait.Until(func() {
|
||||
l.tunnelsLock.Lock()
|
||||
defer l.tunnelsLock.Unlock()
|
||||
// Healthcheck each tunnel every minute
|
||||
numTunnels := len(l.entries)
|
||||
for i, entry := range l.entries {
|
||||
// Stagger healthchecks evenly across duration of healthCheckPoll.
|
||||
delay := healthCheckPoll * time.Duration(i) / time.Duration(numTunnels)
|
||||
l.delayedHealthCheck(entry, delay)
|
||||
}
|
||||
}, healthCheckPoll, stopChan)
|
||||
return l
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) delayedHealthCheck(e sshTunnelEntry, delay time.Duration) {
|
||||
go func() {
|
||||
defer runtime.HandleCrash()
|
||||
time.Sleep(delay)
|
||||
if err := l.healthCheck(e); err != nil {
|
||||
klog.Errorf("Healthcheck failed for tunnel to %q: %v", e.Address, err)
|
||||
klog.Infof("Attempting once to re-establish tunnel to %q", e.Address)
|
||||
l.removeAndReAdd(e)
|
||||
}
|
||||
}()
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) healthCheck(e sshTunnelEntry) error {
|
||||
// GET the healthcheck path using the provided tunnel's dial function.
|
||||
transport := utilnet.SetTransportDefaults(&http.Transport{
|
||||
DialContext: e.Tunnel.Dial,
|
||||
// TODO(cjcullen): Plumb real TLS options through.
|
||||
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
|
||||
// We don't reuse the clients, so disable the keep-alive to properly
|
||||
// close the connection.
|
||||
DisableKeepAlives: true,
|
||||
})
|
||||
client := &http.Client{Transport: transport}
|
||||
resp, err := client.Get(l.healthCheckURL.String())
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
resp.Body.Close()
|
||||
return nil
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) removeAndReAdd(e sshTunnelEntry) {
|
||||
// Find the entry to replace.
|
||||
l.tunnelsLock.Lock()
|
||||
for i, entry := range l.entries {
|
||||
if entry.Tunnel == e.Tunnel {
|
||||
l.entries = append(l.entries[:i], l.entries[i+1:]...)
|
||||
l.adding[e.Address] = true
|
||||
break
|
||||
}
|
||||
}
|
||||
l.tunnelsLock.Unlock()
|
||||
if err := e.Tunnel.Close(); err != nil {
|
||||
klog.Infof("Failed to close removed tunnel: %v", err)
|
||||
}
|
||||
go l.createAndAddTunnel(e.Address)
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) Dial(ctx context.Context, net, addr string) (net.Conn, error) {
|
||||
start := time.Now()
|
||||
id := mathrand.Int63() // So you can match begins/ends in the log.
|
||||
klog.Infof("[%x: %v] Dialing...", id, addr)
|
||||
defer func() {
|
||||
klog.Infof("[%x: %v] Dialed in %v.", id, addr, time.Since(start))
|
||||
}()
|
||||
tunnel, err := l.pickTunnel(strings.Split(addr, ":")[0])
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return tunnel.Dial(ctx, net, addr)
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) pickTunnel(addr string) (tunnel, error) {
|
||||
l.tunnelsLock.Lock()
|
||||
defer l.tunnelsLock.Unlock()
|
||||
if len(l.entries) == 0 {
|
||||
return nil, fmt.Errorf("No SSH tunnels currently open. Were the targets able to accept an ssh-key for user %q?", l.user)
|
||||
}
|
||||
// Prefer same tunnel as kubelet
|
||||
for _, entry := range l.entries {
|
||||
if entry.Address == addr {
|
||||
return entry.Tunnel, nil
|
||||
}
|
||||
}
|
||||
klog.Warningf("SSH tunnel not found for address %q, picking random node", addr)
|
||||
n := mathrand.Intn(len(l.entries))
|
||||
return l.entries[n].Tunnel, nil
|
||||
}
|
||||
|
||||
// Update reconciles the list's entries with the specified addresses. Existing
|
||||
// tunnels that are not in addresses are removed from entries and closed in a
|
||||
// background goroutine. New tunnels specified in addresses are opened in a
|
||||
// background goroutine and then added to entries.
|
||||
func (l *SSHTunnelList) Update(addrs []string) {
|
||||
haveAddrsMap := make(map[string]bool)
|
||||
wantAddrsMap := make(map[string]bool)
|
||||
func() {
|
||||
l.tunnelsLock.Lock()
|
||||
defer l.tunnelsLock.Unlock()
|
||||
// Build a map of what we currently have.
|
||||
for i := range l.entries {
|
||||
haveAddrsMap[l.entries[i].Address] = true
|
||||
}
|
||||
// Determine any necessary additions.
|
||||
for i := range addrs {
|
||||
// Add tunnel if it is not in l.entries or l.adding
|
||||
if _, ok := haveAddrsMap[addrs[i]]; !ok {
|
||||
if _, ok := l.adding[addrs[i]]; !ok {
|
||||
l.adding[addrs[i]] = true
|
||||
addr := addrs[i]
|
||||
go func() {
|
||||
defer runtime.HandleCrash()
|
||||
// Actually adding tunnel to list will block until lock
|
||||
// is released after deletions.
|
||||
l.createAndAddTunnel(addr)
|
||||
}()
|
||||
}
|
||||
}
|
||||
wantAddrsMap[addrs[i]] = true
|
||||
}
|
||||
// Determine any necessary deletions.
|
||||
var newEntries []sshTunnelEntry
|
||||
for i := range l.entries {
|
||||
if _, ok := wantAddrsMap[l.entries[i].Address]; !ok {
|
||||
tunnelEntry := l.entries[i]
|
||||
klog.Infof("Removing tunnel to deleted node at %q", tunnelEntry.Address)
|
||||
go func() {
|
||||
defer runtime.HandleCrash()
|
||||
if err := tunnelEntry.Tunnel.Close(); err != nil {
|
||||
klog.Errorf("Failed to close tunnel to %q: %v", tunnelEntry.Address, err)
|
||||
}
|
||||
}()
|
||||
} else {
|
||||
newEntries = append(newEntries, l.entries[i])
|
||||
}
|
||||
}
|
||||
l.entries = newEntries
|
||||
}()
|
||||
}
|
||||
|
||||
func (l *SSHTunnelList) createAndAddTunnel(addr string) {
|
||||
klog.Infof("Trying to add tunnel to %q", addr)
|
||||
tunnel, err := l.tunnelCreator.newSSHTunnel(l.user, l.keyfile, addr)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to create tunnel for %q: %v", addr, err)
|
||||
return
|
||||
}
|
||||
if err := tunnel.Open(); err != nil {
|
||||
klog.Errorf("Failed to open tunnel to %q: %v", addr, err)
|
||||
l.tunnelsLock.Lock()
|
||||
delete(l.adding, addr)
|
||||
l.tunnelsLock.Unlock()
|
||||
return
|
||||
}
|
||||
l.tunnelsLock.Lock()
|
||||
l.entries = append(l.entries, sshTunnelEntry{addr, tunnel})
|
||||
delete(l.adding, addr)
|
||||
l.tunnelsLock.Unlock()
|
||||
klog.Infof("Successfully added tunnel for %q", addr)
|
||||
}
|
||||
|
||||
func EncodePrivateKey(private *rsa.PrivateKey) []byte {
|
||||
return pem.EncodeToMemory(&pem.Block{
|
||||
Bytes: x509.MarshalPKCS1PrivateKey(private),
|
||||
Type: "RSA PRIVATE KEY",
|
||||
})
|
||||
}
|
||||
|
||||
func EncodePublicKey(public *rsa.PublicKey) ([]byte, error) {
|
||||
publicBytes, err := x509.MarshalPKIXPublicKey(public)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return pem.EncodeToMemory(&pem.Block{
|
||||
Bytes: publicBytes,
|
||||
Type: "PUBLIC KEY",
|
||||
}), nil
|
||||
}
|
||||
|
||||
func EncodeSSHKey(public *rsa.PublicKey) ([]byte, error) {
|
||||
publicKey, err := ssh.NewPublicKey(public)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return ssh.MarshalAuthorizedKey(publicKey), nil
|
||||
}
|
||||
|
||||
func GenerateKey(bits int) (*rsa.PrivateKey, *rsa.PublicKey, error) {
|
||||
private, err := rsa.GenerateKey(rand.Reader, bits)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
return private, &private.PublicKey, nil
|
||||
}
|
||||
@ -1,365 +0,0 @@
|
||||
/*
|
||||
Copyright 2015 The Kubernetes Authors.
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
|
||||
package ssh
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"io"
|
||||
"net"
|
||||
"os"
|
||||
"reflect"
|
||||
"strings"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"golang.org/x/crypto/ssh"
|
||||
|
||||
"k8s.io/apimachinery/pkg/util/wait"
|
||||
"k8s.io/klog/v2"
|
||||
)
|
||||
|
||||
type testSSHServer struct {
|
||||
Host string
|
||||
Port string
|
||||
Type string
|
||||
Data []byte
|
||||
PrivateKey []byte
|
||||
PublicKey []byte
|
||||
}
|
||||
|
||||
func runTestSSHServer(user, password string) (*testSSHServer, error) {
|
||||
result := &testSSHServer{}
|
||||
// Largely derived from https://godoc.org/golang.org/x/crypto/ssh#example-NewServerConn
|
||||
config := &ssh.ServerConfig{
|
||||
PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
|
||||
if c.User() == user && string(pass) == password {
|
||||
return nil, nil
|
||||
}
|
||||
return nil, fmt.Errorf("password rejected for %s", c.User())
|
||||
},
|
||||
PublicKeyCallback: func(c ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
|
||||
result.Type = key.Type()
|
||||
result.Data = ssh.MarshalAuthorizedKey(key)
|
||||
return nil, nil
|
||||
},
|
||||
}
|
||||
|
||||
privateKey, publicKey, err := GenerateKey(2048)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
privateBytes := EncodePrivateKey(privateKey)
|
||||
signer, err := ssh.ParsePrivateKey(privateBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
config.AddHostKey(signer)
|
||||
result.PrivateKey = privateBytes
|
||||
|
||||
publicBytes, err := EncodePublicKey(publicKey)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
result.PublicKey = publicBytes
|
||||
|
||||
listener, err := net.Listen("tcp", "127.0.0.1:0")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
host, port, err := net.SplitHostPort(listener.Addr().String())
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
result.Host = host
|
||||
result.Port = port
|
||||
go func() {
|
||||
// TODO: return this port.
|
||||
defer listener.Close()
|
||||
|
||||
conn, err := listener.Accept()
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to accept: %v", err)
|
||||
}
|
||||
_, chans, reqs, err := ssh.NewServerConn(conn, config)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed handshake: %v", err)
|
||||
}
|
||||
go ssh.DiscardRequests(reqs)
|
||||
for newChannel := range chans {
|
||||
if newChannel.ChannelType() != "direct-tcpip" {
|
||||
newChannel.Reject(ssh.UnknownChannelType, fmt.Sprintf("unknown channel type: %s", newChannel.ChannelType()))
|
||||
continue
|
||||
}
|
||||
channel, requests, err := newChannel.Accept()
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to accept channel: %v", err)
|
||||
}
|
||||
|
||||
for req := range requests {
|
||||
klog.Infof("Got request: %v", req)
|
||||
}
|
||||
|
||||
channel.Close()
|
||||
}
|
||||
}()
|
||||
return result, nil
|
||||
}
|
||||
|
||||
func TestSSHTunnel(t *testing.T) {
|
||||
private, public, err := GenerateKey(2048)
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
t.FailNow()
|
||||
}
|
||||
server, err := runTestSSHServer("foo", "bar")
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
t.FailNow()
|
||||
}
|
||||
|
||||
privateData := EncodePrivateKey(private)
|
||||
tunnel, err := newSSHTunnelFromBytes("foo", privateData, server.Host)
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
t.FailNow()
|
||||
}
|
||||
tunnel.SSHPort = server.Port
|
||||
|
||||
if err := tunnel.Open(); err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
t.FailNow()
|
||||
}
|
||||
|
||||
_, err = tunnel.Dial(context.Background(), "tcp", "127.0.0.1:8080")
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
}
|
||||
if server.Type != "ssh-rsa" {
|
||||
t.Errorf("expected %s, got %s", "ssh-rsa", server.Type)
|
||||
}
|
||||
|
||||
publicData, err := EncodeSSHKey(public)
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
}
|
||||
if !reflect.DeepEqual(server.Data, publicData) {
|
||||
t.Errorf("expected %s, got %s", string(server.Data), string(privateData))
|
||||
}
|
||||
|
||||
if err := tunnel.Close(); err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
type fakeTunnel struct{}
|
||||
|
||||
func (*fakeTunnel) Open() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*fakeTunnel) Close() error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (*fakeTunnel) Dial(ctx context.Context, network, address string) (net.Conn, error) {
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
type fakeTunnelCreator struct{}
|
||||
|
||||
func (*fakeTunnelCreator) newSSHTunnel(string, string, string) (tunnel, error) {
|
||||
return &fakeTunnel{}, nil
|
||||
}
|
||||
|
||||
func TestSSHTunnelListUpdate(t *testing.T) {
|
||||
// Start with an empty tunnel list.
|
||||
l := &SSHTunnelList{
|
||||
adding: make(map[string]bool),
|
||||
tunnelCreator: &fakeTunnelCreator{},
|
||||
}
|
||||
|
||||
// Start with 2 tunnels.
|
||||
addressStrings := []string{"1.2.3.4", "5.6.7.8"}
|
||||
l.Update(addressStrings)
|
||||
checkTunnelsCorrect(t, l, addressStrings)
|
||||
|
||||
// Add another tunnel.
|
||||
addressStrings = append(addressStrings, "9.10.11.12")
|
||||
l.Update(addressStrings)
|
||||
checkTunnelsCorrect(t, l, addressStrings)
|
||||
|
||||
// Go down to a single tunnel.
|
||||
addressStrings = []string{"1.2.3.4"}
|
||||
l.Update(addressStrings)
|
||||
checkTunnelsCorrect(t, l, addressStrings)
|
||||
|
||||
// Replace w/ all new tunnels.
|
||||
addressStrings = []string{"21.22.23.24", "25.26.27.28"}
|
||||
l.Update(addressStrings)
|
||||
checkTunnelsCorrect(t, l, addressStrings)
|
||||
|
||||
// Call update with the same tunnels.
|
||||
l.Update(addressStrings)
|
||||
checkTunnelsCorrect(t, l, addressStrings)
|
||||
}
|
||||
|
||||
func checkTunnelsCorrect(t *testing.T, tunnelList *SSHTunnelList, addresses []string) {
|
||||
if err := wait.Poll(100*time.Millisecond, 2*time.Second, func() (bool, error) {
|
||||
return hasCorrectTunnels(tunnelList, addresses), nil
|
||||
}); err != nil {
|
||||
t.Errorf("Error waiting for tunnels to reach expected state: %v. Expected %v, had %v", err, addresses, tunnelList)
|
||||
}
|
||||
}
|
||||
|
||||
func hasCorrectTunnels(tunnelList *SSHTunnelList, addresses []string) bool {
|
||||
tunnelList.tunnelsLock.Lock()
|
||||
defer tunnelList.tunnelsLock.Unlock()
|
||||
wantMap := make(map[string]bool)
|
||||
for _, addr := range addresses {
|
||||
wantMap[addr] = true
|
||||
}
|
||||
haveMap := make(map[string]bool)
|
||||
for _, entry := range tunnelList.entries {
|
||||
if wantMap[entry.Address] == false {
|
||||
return false
|
||||
}
|
||||
haveMap[entry.Address] = true
|
||||
}
|
||||
for _, addr := range addresses {
|
||||
if haveMap[addr] == false {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
type mockSSHDialer struct {
|
||||
network string
|
||||
addr string
|
||||
config *ssh.ClientConfig
|
||||
}
|
||||
|
||||
func (d *mockSSHDialer) Dial(network, addr string, config *ssh.ClientConfig) (*ssh.Client, error) {
|
||||
d.network = network
|
||||
d.addr = addr
|
||||
d.config = config
|
||||
return nil, fmt.Errorf("mock error from Dial")
|
||||
}
|
||||
|
||||
type mockSigner struct {
|
||||
}
|
||||
|
||||
func (s *mockSigner) PublicKey() ssh.PublicKey {
|
||||
panic("mockSigner.PublicKey not implemented")
|
||||
}
|
||||
|
||||
func (s *mockSigner) Sign(rand io.Reader, data []byte) (*ssh.Signature, error) {
|
||||
panic("mockSigner.Sign not implemented")
|
||||
}
|
||||
|
||||
func TestSSHUser(t *testing.T) {
|
||||
signer := &mockSigner{}
|
||||
|
||||
table := []struct {
|
||||
title string
|
||||
user string
|
||||
host string
|
||||
signer ssh.Signer
|
||||
command string
|
||||
expectUser string
|
||||
}{
|
||||
{
|
||||
title: "all values provided",
|
||||
user: "testuser",
|
||||
host: "testhost",
|
||||
signer: signer,
|
||||
command: "uptime",
|
||||
expectUser: "testuser",
|
||||
},
|
||||
{
|
||||
title: "empty user defaults to GetEnv(USER)",
|
||||
user: "",
|
||||
host: "testhost",
|
||||
signer: signer,
|
||||
command: "uptime",
|
||||
expectUser: os.Getenv("USER"),
|
||||
},
|
||||
}
|
||||
|
||||
for _, item := range table {
|
||||
dialer := &mockSSHDialer{}
|
||||
|
||||
_, _, _, err := runSSHCommand(dialer, item.command, item.user, item.host, item.signer, false)
|
||||
if err == nil {
|
||||
t.Errorf("expected error (as mock returns error); did not get one")
|
||||
}
|
||||
errString := err.Error()
|
||||
if !strings.HasPrefix(errString, fmt.Sprintf("error getting SSH client to %s@%s:", item.expectUser, item.host)) {
|
||||
t.Errorf("unexpected error: %v", errString)
|
||||
}
|
||||
|
||||
if dialer.network != "tcp" {
|
||||
t.Errorf("unexpected network: %v", dialer.network)
|
||||
}
|
||||
|
||||
if dialer.config.User != item.expectUser {
|
||||
t.Errorf("unexpected user: %v", dialer.config.User)
|
||||
}
|
||||
if len(dialer.config.Auth) != 1 {
|
||||
t.Errorf("unexpected auth: %v", dialer.config.Auth)
|
||||
}
|
||||
// (No way to test Auth - nothing exported?)
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestTimeoutDialer(t *testing.T) {
|
||||
listener, err := net.Listen("tcp", "127.0.0.1:0")
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
t.FailNow()
|
||||
}
|
||||
|
||||
testCases := []struct {
|
||||
timeout time.Duration
|
||||
expectedErrString string
|
||||
}{
|
||||
// delay > timeout should cause ssh.Dial to timeout.
|
||||
{1, "i/o timeout"},
|
||||
}
|
||||
for _, tc := range testCases {
|
||||
dialer := &timeoutDialer{&realSSHDialer{}, tc.timeout}
|
||||
_, err := dialer.Dial("tcp", listener.Addr().String(), &ssh.ClientConfig{})
|
||||
if len(tc.expectedErrString) == 0 && err != nil ||
|
||||
!strings.Contains(fmt.Sprint(err), tc.expectedErrString) {
|
||||
t.Errorf("Expected error to contain %q; got %v", tc.expectedErrString, err)
|
||||
}
|
||||
}
|
||||
|
||||
listener.Close()
|
||||
}
|
||||
|
||||
func newSSHTunnelFromBytes(user string, privateKey []byte, host string) (*sshTunnel, error) {
|
||||
signer, err := MakePrivateKeySignerFromBytes(privateKey)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return makeSSHTunnel(user, signer, host)
|
||||
}
|
||||
@ -135,11 +135,7 @@ func StartTestServer(t *testing.T, stopCh <-chan struct{}, setup TestServerSetup
|
||||
t.Fatalf("failed to validate ServerRunOptions: %v", utilerrors.NewAggregate(errs))
|
||||
}
|
||||
|
||||
tunneler, proxyTransport, err := app.CreateNodeDialer(completedOptions)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
kubeAPIServerConfig, _, _, err := app.CreateKubeAPIServerConfig(completedOptions, tunneler, proxyTransport)
|
||||
kubeAPIServerConfig, _, _, err := app.CreateKubeAPIServerConfig(completedOptions)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user