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Add checks to backend for terminal proxy
Access to commandline terminals (cloud shells) has to be restricted to avoid privilege escalation issues. This commit adds the following checks: - Ensure webhooks expected by che-workspace-operator are installed - Ensures the user requesting a terminal is not a cluster admin (done by checking if they can read pods in a privileged namespace (openshift-operators). Adds an endpoint: /api/terminal/available/ that can be used to check if basic requirements for the proxy are met (workspace operator is running) Signed-off-by: Angel Misevski <amisevsk@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package terminal | ||
|
|
||
| import ( | ||
| authv1 "k8s.io/api/authorization/v1" | ||
| ) | ||
|
|
||
| func (p *Proxy) checkUserPermissions(token string) (bool, error) { | ||
| client, err := p.createTypedClient(token) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
|
||
| sar := &authv1.SelfSubjectAccessReview{ | ||
| Spec: authv1.SelfSubjectAccessReviewSpec{ | ||
| ResourceAttributes: &authv1.ResourceAttributes{ | ||
| Namespace: "openshift-operators", | ||
| Verb: "create", | ||
| Resource: "pods", | ||
| }, | ||
| }, | ||
| } | ||
| res, err := client.AuthorizationV1().SelfSubjectAccessReviews().Create(sar) | ||
| if err != nil || res == nil { | ||
| return false, err | ||
| } | ||
| return !res.Status.Allowed, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| package terminal | ||
|
|
||
| import ( | ||
| "k8s.io/client-go/dynamic" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/rest" | ||
| ) | ||
|
|
||
| // createDynamicClient create dynamic client with the configured token to be used | ||
| func (p *Proxy) createDynamicClient(token string) (dynamic.Interface, error) { | ||
| var tlsClientConfig rest.TLSClientConfig | ||
| if p.TLSClientConfig.InsecureSkipVerify { | ||
| // off-cluster mode | ||
| tlsClientConfig.Insecure = true | ||
| } else { | ||
| inCluster, err := rest.InClusterConfig() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| tlsClientConfig = inCluster.TLSClientConfig | ||
| } | ||
|
|
||
| config := &rest.Config{ | ||
| Host: p.ClusterEndpoint.Host, | ||
| TLSClientConfig: tlsClientConfig, | ||
| BearerToken: token, | ||
| } | ||
|
|
||
| client, err := dynamic.NewForConfig(dynamic.ConfigFor(config)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return client, nil | ||
| } | ||
|
|
||
| func (p *Proxy) createTypedClient(token string) (*kubernetes.Clientset, error) { | ||
| var tlsClientConfig rest.TLSClientConfig | ||
| if p.TLSClientConfig.InsecureSkipVerify { | ||
| // off-cluster mode | ||
| tlsClientConfig.Insecure = true | ||
| } else { | ||
| inCluster, err := rest.InClusterConfig() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| tlsClientConfig = inCluster.TLSClientConfig | ||
| } | ||
|
|
||
| config := &rest.Config{ | ||
| Host: p.ClusterEndpoint.Host, | ||
| TLSClientConfig: tlsClientConfig, | ||
| BearerToken: token, | ||
| } | ||
|
|
||
| return kubernetes.NewForConfig(config) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package terminal | ||
|
|
||
| import ( | ||
| "k8s.io/apimachinery/pkg/api/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/rest" | ||
| ) | ||
|
|
||
| const ( | ||
| webhookName = "workspace.che.eclipse.org" | ||
| ) | ||
|
|
||
| func workspaceOperatorIsRunning() (bool, error) { | ||
| config, err := rest.InClusterConfig() | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| client, err := kubernetes.NewForConfig(config) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
|
||
| _, err = client.AdmissionregistrationV1().MutatingWebhookConfigurations().Get(webhookName, metav1.GetOptions{}) | ||
| if err != nil { | ||
| if errors.IsNotFound(err) { | ||
| return false, nil | ||
| } | ||
| return false, err | ||
| } | ||
|
|
||
| _, err = client.AdmissionregistrationV1().ValidatingWebhookConfigurations().Get(webhookName, metav1.GetOptions{}) | ||
| if err != nil { | ||
| if errors.IsNotFound(err) { | ||
| return false, nil | ||
| } | ||
| return false, err | ||
| } | ||
| return true, nil | ||
| } |
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