// subjectMatches returns true if specified user and group properties in the policy match the attributes
func subjectMatches(p api.Policy, a authorizer.Attributes) bool {
matched := false
// If the policy specified a user, ensure it matches
if len(p.Spec.User) > 0 {
if p.Spec.User == "*" {
matched = true
} else {
matched = p.Spec.User == a.GetUserName()
if !matched {
return false
}
}
}
// If the policy specified a group, ensure it matches
if len(p.Spec.Group) > 0 {
if p.Spec.Group == "*" {
matched = true
} else {
matched = false
for _, group := range a.GetGroups() {
if p.Spec.Group == group {
matched = true
}
}
if !matched {
return false
}
}
}
return matched
}
// OriginAuthorizerAttributes adapts Kubernetes authorization attributes to Origin authorization attributes
// Note that some info (like resourceName, apiVersion, apiGroup) is not available from the Kubernetes attributes
func OriginAuthorizerAttributes(kattrs kauthorizer.Attributes) (kapi.Context, oauthorizer.AuthorizationAttributes) {
// Build a context to hold the namespace and user info
ctx := kapi.NewContext()
ctx = kapi.WithNamespace(ctx, kattrs.GetNamespace())
ctx = kapi.WithUser(ctx, &user.DefaultInfo{
Name: kattrs.GetUserName(),
Groups: kattrs.GetGroups(),
})
// If the passed attributes already satisfy our interface, use it directly
if oattrs, ok := kattrs.(oauthorizer.AuthorizationAttributes); ok {
return ctx, oattrs
}
// Otherwise build what we can
oattrs := &oauthorizer.DefaultAuthorizationAttributes{
Verb: kattrs.GetVerb(),
Resource: kattrs.GetResource(),
// TODO: add to kube authorizer attributes
// APIVersion string
// APIGroup string
// ResourceName string
// RequestAttributes interface{}
// NonResourceURL bool
// URL string
}
return ctx, oattrs
}
func (sarAuthorizer) Authorize(a authorizer.Attributes) (bool, string, error) {
if a.GetUser().GetName() == "dave" {
return false, "no", errors.New("I'm sorry, Dave")
}
return true, "you're not dave", nil
}
func (r *RBACAuthorizer) Authorize(requestAttributes authorizer.Attributes) (bool, string, error) {
rules, ruleResolutionError := r.authorizationRuleResolver.RulesFor(requestAttributes.GetUser(), requestAttributes.GetNamespace())
if RulesAllow(requestAttributes, rules...) {
return true, "", nil
}
return false, "", ruleResolutionError
}
func (r *privilegedGroupAuthorizer) Authorize(attr authorizer.Attributes) (bool, string, error) {
for attr_group := range attr.GetUser().GetGroups() {
for priv_group := range r.groups {
if priv_group == attr_group {
return true, "", nil
}
}
}
return false, "Not in privileged list.", nil
}
func (r *RBACAuthorizer) Authorize(requestAttributes authorizer.Attributes) (bool, string, error) {
rules, ruleResolutionError := r.authorizationRuleResolver.RulesFor(requestAttributes.GetUser(), requestAttributes.GetNamespace())
if RulesAllow(requestAttributes, rules...) {
return true, "", nil
}
glog.V(2).Infof("RBAC DENY: user %q groups %v cannot %q on \"%v.%v/%v\"", requestAttributes.GetUser().GetName(), requestAttributes.GetUser().GetGroups(),
requestAttributes.GetVerb(), requestAttributes.GetResource(), requestAttributes.GetAPIGroup(), requestAttributes.GetSubresource())
return false, "", ruleResolutionError
}
func (r *privilegedGroupAuthorizer) Authorize(attr authorizer.Attributes) (bool, string, error) {
if attr.GetUser() == nil {
return false, "Error", errors.New("no user on request.")
}
for _, attr_group := range attr.GetUser().GetGroups() {
for _, priv_group := range r.groups {
if priv_group == attr_group {
return true, "", nil
}
}
}
return false, "", nil
}
func verbMatches(p api.Policy, a authorizer.Attributes) bool {
// TODO: match on verb
// All policies allow read only requests
if a.IsReadOnly() {
return true
}
// Allow if policy is not readonly
if !p.Spec.Readonly {
return true
}
return false
}
// alice can't act as anyone and bob can't do anything but act-as someone
func (impersonateAuthorizer) Authorize(a authorizer.Attributes) error {
if a.GetUserName() == "alice" && a.GetVerb() != "impersonate" {
return nil
}
if a.GetUserName() == "bob" && a.GetVerb() == "impersonate" {
return nil
}
return errors.New("I can't allow that. Go ask alice.")
}
func (p policy) matches(a authorizer.Attributes) bool {
if p.subjectMatches(a) {
if p.Readonly == false || (p.Readonly == a.IsReadOnly()) {
switch {
case p.NonResourcePath != "":
if p.NonResourcePath == a.GetNonResourcePath() {
return true
}
// When the path is a non-resource path it cannot match.
case len(a.GetNonResourcePath()) == 0 && (p.Resource == "" || (p.Resource == a.GetResource())):
if p.Namespace == "" || (p.Namespace == a.GetNamespace()) {
return true
}
}
}
}
return false
}
func (p policy) subjectMatches(a authorizer.Attributes) bool {
if p.User != "" {
// Require user match
if p.User != a.GetUserName() {
return false
}
}
if p.Group != "" {
// Require group match
for _, group := range a.GetGroups() {
if p.Group == group {
return true
}
}
return false
}
return true
}
func resourceMatches(p api.Policy, a authorizer.Attributes) bool {
// A resource policy cannot match a non-resource request
if a.IsResourceRequest() {
if p.Spec.Namespace == "*" || p.Spec.Namespace == a.GetNamespace() {
if p.Spec.Resource == "*" || p.Spec.Resource == a.GetResource() {
if p.Spec.APIGroup == "*" || p.Spec.APIGroup == a.GetAPIGroup() {
return true
}
}
}
}
return false
}
// subjectMatches returns true if specified user and group properties in the policy match the attributes
func subjectMatches(p api.Policy, a authorizer.Attributes) bool {
matched := false
username := ""
groups := []string{}
if user := a.GetUser(); user != nil {
username = user.GetName()
groups = user.GetGroups()
}
// If the policy specified a user, ensure it matches
if len(p.Spec.User) > 0 {
if p.Spec.User == "*" {
matched = true
} else {
matched = p.Spec.User == username
if !matched {
return false
}
}
}
// If the policy specified a group, ensure it matches
if len(p.Spec.Group) > 0 {
if p.Spec.Group == "*" {
matched = true
} else {
matched = false
for _, group := range groups {
if p.Spec.Group == group {
matched = true
}
}
if !matched {
return false
}
}
}
return matched
}
func (p policy) matches(a authorizer.Attributes) bool {
if p.subjectMatches(a) {
if p.Readonly == false || (p.Readonly == a.IsReadOnly()) {
if p.Resource == "" || (p.Resource == a.GetResource()) {
if p.Namespace == "" || (p.Namespace == a.GetNamespace()) {
return true
}
}
}
}
return false
}
func (fakeAuthorizer) Authorize(a authorizer.Attributes) (bool, string, error) {
username := a.GetUser().GetName()
if username == "non-deleter" {
if a.GetVerb() == "delete" {
return false, "", nil
}
return true, "", nil
}
if username == "non-pod-deleter" {
if a.GetVerb() == "delete" && a.GetResource() == "pods" {
return false, "", nil
}
return true, "", nil
}
return true, "", nil
}
func nonResourceMatches(p api.Policy, a authorizer.Attributes) bool {
// A non-resource policy cannot match a resource request
if !a.IsResourceRequest() {
// Allow wildcard match
if p.Spec.NonResourcePath == "*" {
return true
}
// Allow exact match
if p.Spec.NonResourcePath == a.GetPath() {
return true
}
// Allow a trailing * subpath match
if strings.HasSuffix(p.Spec.NonResourcePath, "*") && strings.HasPrefix(a.GetPath(), strings.TrimRight(p.Spec.NonResourcePath, "*")) {
return true
}
}
return false
}
// Authorize makes a REST request to the remote service describing the attempted action as a JSON
// serialized api.authorization.v1beta1.SubjectAccessReview object. An example request body is
// provided bellow.
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "spec": {
// "resourceAttributes": {
// "namespace": "kittensandponies",
// "verb": "GET",
// "group": "group3",
// "resource": "pods"
// },
// "user": "******",
// "group": [
// "group1",
// "group2"
// ]
// }
// }
//
// The remote service is expected to fill the SubjectAccessReviewStatus field to either allow or
// disallow access. A permissive response would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": true
// }
// }
//
// To disallow access, the remote service would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": false,
// "reason": "user does not have read access to the namespace"
// }
// }
//
func (w *WebhookAuthorizer) Authorize(attr authorizer.Attributes) (err error) {
r := &v1beta1.SubjectAccessReview{
Spec: v1beta1.SubjectAccessReviewSpec{
User: attr.GetUserName(),
Groups: attr.GetGroups(),
},
}
if attr.IsResourceRequest() {
r.Spec.ResourceAttributes = &v1beta1.ResourceAttributes{
Namespace: attr.GetNamespace(),
Verb: attr.GetVerb(),
Group: attr.GetAPIGroup(),
Version: attr.GetAPIVersion(),
Resource: attr.GetResource(),
Subresource: attr.GetSubresource(),
Name: attr.GetName(),
}
} else {
r.Spec.NonResourceAttributes = &v1beta1.NonResourceAttributes{
Path: attr.GetPath(),
Verb: attr.GetVerb(),
}
}
key, err := json.Marshal(r.Spec)
if err != nil {
return err
}
if entry, ok := w.responseCache.Get(string(key)); ok {
r.Status = entry.(v1beta1.SubjectAccessReviewStatus)
} else {
result := w.WithExponentialBackoff(func() restclient.Result {
return w.RestClient.Post().Body(r).Do()
})
if err := result.Error(); err != nil {
// An error here indicates bad configuration or an outage. Log for debugging.
glog.Errorf("Failed to make webhook authorizer request: %v", err)
return err
}
var statusCode int
if result.StatusCode(&statusCode); statusCode < 200 || statusCode >= 300 {
return fmt.Errorf("Error contacting webhook: %d", statusCode)
}
if err := result.Into(r); err != nil {
return err
}
if r.Status.Allowed {
w.responseCache.Add(string(key), r.Status, w.authorizedTTL)
} else {
w.responseCache.Add(string(key), r.Status, w.unauthorizedTTL)
}
}
if r.Status.Allowed {
return nil
}
if r.Status.Reason != "" {
return errors.New(r.Status.Reason)
}
return errors.New("unauthorized")
}
func RuleAllows(requestAttributes authorizer.Attributes, rule rbac.PolicyRule) bool {
if requestAttributes.IsResourceRequest() {
resource := requestAttributes.GetResource()
if len(requestAttributes.GetSubresource()) > 0 {
resource = requestAttributes.GetResource() + "/" + requestAttributes.GetSubresource()
}
return rbac.VerbMatches(rule, requestAttributes.GetVerb()) &&
rbac.APIGroupMatches(rule, requestAttributes.GetAPIGroup()) &&
rbac.ResourceMatches(rule, resource) &&
rbac.ResourceNameMatches(rule, requestAttributes.GetName())
}
return rbac.VerbMatches(rule, requestAttributes.GetVerb()) &&
rbac.NonResourceURLMatches(rule, requestAttributes.GetPath())
}
func (allowAliceAuthorizer) Authorize(a authorizer.Attributes) error {
if a.GetUserName() == "alice" {
return nil
}
return errors.New("I can't allow that. Go ask alice.")
}
// alice can't act as anyone and bob can't do anything but act-as someone
func (impersonateAuthorizer) Authorize(a authorizer.Attributes) error {
// alice can impersonate service accounts and do other actions
if a.GetUserName() == "alice" && a.GetVerb() == "impersonate" && a.GetResource() == "serviceaccounts" {
return nil
}
if a.GetUserName() == "alice" && a.GetVerb() != "impersonate" {
return nil
}
// bob can impersonate anyone, but that it
if a.GetUserName() == "bob" && a.GetVerb() == "impersonate" {
return nil
}
// service accounts can do everything
if strings.HasPrefix(a.GetUserName(), serviceaccount.ServiceAccountUsernamePrefix) {
return nil
}
return errors.New("I can't allow that. Go ask alice.")
}
// alice can't act as anyone and bob can't do anything but act-as someone
func (impersonateAuthorizer) Authorize(a authorizer.Attributes) (bool, string, error) {
// alice can impersonate service accounts and do other actions
if a.GetUser() != nil && a.GetUser().GetName() == "alice" && a.GetVerb() == "impersonate" && a.GetResource() == "serviceaccounts" {
return true, "", nil
}
if a.GetUser() != nil && a.GetUser().GetName() == "alice" && a.GetVerb() != "impersonate" {
return true, "", nil
}
// bob can impersonate anyone, but that it
if a.GetUser() != nil && a.GetUser().GetName() == "bob" && a.GetVerb() == "impersonate" {
return true, "", nil
}
// service accounts can do everything
if a.GetUser() != nil && strings.HasPrefix(a.GetUser().GetName(), serviceaccount.ServiceAccountUsernamePrefix) {
return true, "", nil
}
return false, "I can't allow that. Go ask alice.", nil
}
func (impersonateAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
user := a.GetUser()
switch {
case user.GetName() == "system:admin":
return true, "", nil
case user.GetName() == "tester":
return false, "", fmt.Errorf("works on my machine")
case user.GetName() == "deny-me":
return false, "denied", nil
}
if len(user.GetGroups()) > 0 && user.GetGroups()[0] == "wheel" && a.GetVerb() == "impersonate" && a.GetResource() == "users" {
return true, "", nil
}
if len(user.GetGroups()) > 0 && user.GetGroups()[0] == "sa-impersonater" && a.GetVerb() == "impersonate" && a.GetResource() == "serviceaccounts" {
return true, "", nil
}
if len(user.GetGroups()) > 0 && user.GetGroups()[0] == "regular-impersonater" && a.GetVerb() == "impersonate" && a.GetResource() == "users" {
return true, "", nil
}
if len(user.GetGroups()) > 1 && user.GetGroups()[1] == "group-impersonater" && a.GetVerb() == "impersonate" && a.GetResource() == "groups" {
return true, "", nil
}
if len(user.GetGroups()) > 1 && user.GetGroups()[1] == "extra-setter-scopes" && a.GetVerb() == "impersonate" && a.GetResource() == "userextras" && a.GetSubresource() == "scopes" {
return true, "", nil
}
if len(user.GetGroups()) > 1 && user.GetGroups()[1] == "extra-setter-particular-scopes" &&
a.GetVerb() == "impersonate" && a.GetResource() == "userextras" && a.GetSubresource() == "scopes" && a.GetName() == "scope-a" {
return true, "", nil
}
if len(user.GetGroups()) > 1 && user.GetGroups()[1] == "extra-setter-project" && a.GetVerb() == "impersonate" && a.GetResource() == "userextras" && a.GetSubresource() == "project" {
return true, "", nil
}
return false, "deny by default", nil
}
// Authorize makes a REST request to the remote service describing the attempted action as a JSON
// serialized api.authorization.v1beta1.SubjectAccessReview object. An example request body is
// provided bellow.
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "spec": {
// "resourceAttributes": {
// "namespace": "kittensandponies",
// "verb": "GET",
// "group": "group3",
// "resource": "pods"
// },
// "user": "******",
// "group": [
// "group1",
// "group2"
// ]
// }
// }
//
// The remote service is expected to fill the SubjectAccessReviewStatus field to either allow or
// disallow access. A permissive response would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": true
// }
// }
//
// To disallow access, the remote service would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": false,
// "reason": "user does not have read access to the namespace"
// }
// }
//
func (w *WebhookAuthorizer) Authorize(attr authorizer.Attributes) (err error) {
r := &v1beta1.SubjectAccessReview{
Spec: v1beta1.SubjectAccessReviewSpec{
User: attr.GetUserName(),
Groups: attr.GetGroups(),
},
}
if attr.IsResourceRequest() {
r.Spec.ResourceAttributes = &v1beta1.ResourceAttributes{
Namespace: attr.GetNamespace(),
Verb: attr.GetVerb(),
Group: attr.GetAPIGroup(),
Version: attr.GetAPIVersion(),
Resource: attr.GetResource(),
Subresource: attr.GetSubresource(),
Name: attr.GetName(),
}
} else {
r.Spec.NonResourceAttributes = &v1beta1.NonResourceAttributes{
Path: attr.GetPath(),
Verb: attr.GetVerb(),
}
}
result := w.RestClient.Post().Body(r).Do()
if err := result.Error(); err != nil {
return err
}
if err := result.Into(r); err != nil {
return err
}
if r.Status.Allowed {
return nil
}
if r.Status.Reason != "" {
return errors.New(r.Status.Reason)
}
return errors.New("unauthorized")
}
// Authorize makes a REST request to the remote service describing the attempted action as a JSON
// serialized api.authorization.v1beta1.SubjectAccessReview object. An example request body is
// provided bellow.
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "spec": {
// "resourceAttributes": {
// "namespace": "kittensandponies",
// "verb": "GET",
// "group": "group3",
// "resource": "pods"
// },
// "user": "******",
// "group": [
// "group1",
// "group2"
// ]
// }
// }
//
// The remote service is expected to fill the SubjectAccessReviewStatus field to either allow or
// disallow access. A permissive response would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": true
// }
// }
//
// To disallow access, the remote service would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": false,
// "reason": "user does not have read access to the namespace"
// }
// }
//
func (w *WebhookAuthorizer) Authorize(attr authorizer.Attributes) (authorized bool, reason string, err error) {
r := &authorization.SubjectAccessReview{}
if user := attr.GetUser(); user != nil {
r.Spec = authorization.SubjectAccessReviewSpec{
User: user.GetName(),
Groups: user.GetGroups(),
Extra: convertToSARExtra(user.GetExtra()),
}
}
if attr.IsResourceRequest() {
r.Spec.ResourceAttributes = &authorization.ResourceAttributes{
Namespace: attr.GetNamespace(),
Verb: attr.GetVerb(),
Group: attr.GetAPIGroup(),
Version: attr.GetAPIVersion(),
Resource: attr.GetResource(),
Subresource: attr.GetSubresource(),
Name: attr.GetName(),
}
} else {
r.Spec.NonResourceAttributes = &authorization.NonResourceAttributes{
Path: attr.GetPath(),
Verb: attr.GetVerb(),
}
}
key, err := json.Marshal(r.Spec)
if err != nil {
return false, "", err
}
if entry, ok := w.responseCache.Get(string(key)); ok {
r.Status = entry.(authorization.SubjectAccessReviewStatus)
} else {
var (
result *authorization.SubjectAccessReview
err error
)
webhook.WithExponentialBackoff(w.initialBackoff, func() error {
result, err = w.subjectAccessReview.Create(r)
return err
})
if err != nil {
// An error here indicates bad configuration or an outage. Log for debugging.
glog.Errorf("Failed to make webhook authorizer request: %v", err)
return false, "", err
}
r.Status = result.Status
if r.Status.Allowed {
w.responseCache.Add(string(key), r.Status, w.authorizedTTL)
} else {
w.responseCache.Add(string(key), r.Status, w.unauthorizedTTL)
}
}
return r.Status.Allowed, r.Status.Reason, nil
}
// AllowedSubjects returns the subjects that can perform an action and any errors encountered while computing the list.
// It is possible to have both subjects and errors returned if some rolebindings couldn't be resolved, but others could be.
func (r *SubjectAccessEvaluator) AllowedSubjects(requestAttributes authorizer.Attributes) ([]rbac.Subject, error) {
subjects := []rbac.Subject{{Kind: rbac.GroupKind, Name: user.SystemPrivilegedGroup}}
if len(r.superUser) > 0 {
subjects = append(subjects, rbac.Subject{Kind: rbac.UserKind, APIVersion: "v1alpha1", Name: r.superUser})
}
errorlist := []error{}
if clusterRoleBindings, err := r.clusterRoleBindingLister.ListClusterRoleBindings(); err != nil {
errorlist = append(errorlist, err)
} else {
for _, clusterRoleBinding := range clusterRoleBindings {
rules, err := r.roleToRuleMapper.GetRoleReferenceRules(clusterRoleBinding.RoleRef, "")
if err != nil {
// if we have an error, just keep track of it and keep processing. Since rules are additive,
// missing a reference is bad, but we can continue with other rolebindings and still have a list
// that does not contain any invalid values
errorlist = append(errorlist, err)
}
if RulesAllow(requestAttributes, rules...) {
subjects = append(subjects, clusterRoleBinding.Subjects...)
}
}
}
if namespace := requestAttributes.GetNamespace(); len(namespace) > 0 {
if roleBindings, err := r.roleBindingLister.ListRoleBindings(namespace); err != nil {
errorlist = append(errorlist, err)
} else {
for _, roleBinding := range roleBindings {
rules, err := r.roleToRuleMapper.GetRoleReferenceRules(roleBinding.RoleRef, namespace)
if err != nil {
// if we have an error, just keep track of it and keep processing. Since rules are additive,
// missing a reference is bad, but we can continue with other rolebindings and still have a list
// that does not contain any invalid values
errorlist = append(errorlist, err)
}
if RulesAllow(requestAttributes, rules...) {
subjects = append(subjects, roleBinding.Subjects...)
}
}
}
}
dedupedSubjects := []rbac.Subject{}
for _, subject := range subjects {
found := false
for _, curr := range dedupedSubjects {
if curr == subject {
found = true
break
}
}
if !found {
dedupedSubjects = append(dedupedSubjects, subject)
}
}
return subjects, utilerrors.NewAggregate(errorlist)
}
func (ka *allowTestAuthorizer) Authorize(a authorizer.Attributes) (string, error) {
var (
tenantName string
ns *api.Namespace
err error
)
if authorizer.IsWhiteListedUser(a.GetUserName()) {
return "", nil
} else {
if !a.IsReadOnly() && a.GetResource() == "tenants" {
return "", errors.New("only admin can write tenant")
}
}
if a.GetNamespace() != "" {
ns, err = ka.kubeClient.Namespaces().Get(a.GetNamespace())
if err != nil {
glog.Error(err)
return "", err
}
tenantName = ns.Tenant
} else {
if a.GetTenant() != "" {
te, err := ka.kubeClient.Tenants().Get(a.GetTenant())
if err != nil {
glog.Error(err)
return "", err
}
tenantName = te.Name
}
}
if tenantName == "" || tenantName == TenantTest {
return TenantTest, nil
}
return "", errors.New("Keystone authorization failed")
}
func (r *RBACAuthorizer) Authorize(attr authorizer.Attributes) error {
if r.superUser != "" && attr.GetUserName() == r.superUser {
return nil
}
userInfo := &user.DefaultInfo{
Name: attr.GetUserName(),
Groups: attr.GetGroups(),
}
ctx := api.WithNamespace(api.WithUser(api.NewContext(), userInfo), attr.GetNamespace())
// Frame the authorization request as a privilege escalation check.
var requestedRule rbac.PolicyRule
if attr.IsResourceRequest() {
requestedRule = rbac.PolicyRule{
Verbs: []string{attr.GetVerb()},
APIGroups: []string{attr.GetAPIGroup()}, // TODO(ericchiang): add api version here too?
Resources: []string{attr.GetResource()},
ResourceNames: []string{attr.GetName()},
}
} else {
requestedRule = rbac.PolicyRule{
NonResourceURLs: []string{attr.GetPath()},
}
}
return validation.ConfirmNoEscalation(ctx, r.authorizationRuleResolver, []rbac.PolicyRule{requestedRule})
}
// Authorize makes a REST request to the remote service describing the attempted action as a JSON
// serialized api.authorization.v1beta1.SubjectAccessReview object. An example request body is
// provided bellow.
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "spec": {
// "resourceAttributes": {
// "namespace": "kittensandponies",
// "verb": "GET",
// "group": "group3",
// "resource": "pods"
// },
// "user": "******",
// "group": [
// "group1",
// "group2"
// ]
// }
// }
//
// The remote service is expected to fill the SubjectAccessReviewStatus field to either allow or
// disallow access. A permissive response would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": true
// }
// }
//
// To disallow access, the remote service would return:
//
// {
// "apiVersion": "authorization.k8s.io/v1beta1",
// "kind": "SubjectAccessReview",
// "status": {
// "allowed": false,
// "reason": "user does not have read access to the namespace"
// }
// }
//
func (w *WebhookAuthorizer) Authorize(attr authorizer.Attributes) (err error) {
r := &v1beta1.SubjectAccessReview{
Spec: v1beta1.SubjectAccessReviewSpec{
User: attr.GetUserName(),
Groups: attr.GetGroups(),
},
}
if attr.IsResourceRequest() {
r.Spec.ResourceAttributes = &v1beta1.ResourceAttributes{
Namespace: attr.GetNamespace(),
Verb: attr.GetVerb(),
Group: attr.GetAPIGroup(),
Version: attr.GetAPIVersion(),
Resource: attr.GetResource(),
Subresource: attr.GetSubresource(),
Name: attr.GetName(),
}
} else {
r.Spec.NonResourceAttributes = &v1beta1.NonResourceAttributes{
Path: attr.GetPath(),
Verb: attr.GetVerb(),
}
}
key, err := json.Marshal(r.Spec)
if err != nil {
return err
}
if entry, ok := w.responseCache.Get(string(key)); ok {
r.Status = entry.(v1beta1.SubjectAccessReviewStatus)
} else {
result := w.RestClient.Post().Body(r).Do()
if err := result.Error(); err != nil {
return err
}
if err := result.Into(r); err != nil {
return err
}
go func() {
if r.Status.Allowed {
w.responseCache.Add(string(key), r.Status, w.authorizedTTL)
} else {
w.responseCache.Add(string(key), r.Status, w.unauthorizedTTL)
}
}()
}
if r.Status.Allowed {
return nil
}
if r.Status.Reason != "" {
return errors.New(r.Status.Reason)
}
return errors.New("unauthorized")
}
func (authz *mockAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
authz.lastURI = a.GetPath()
return true, "", nil
}
func (allowAliceAuthorizer) Authorize(a authorizer.Attributes) (bool, string, error) {
if a.GetUser() != nil && a.GetUser().GetName() == "alice" {
return true, "", nil
}
return false, "I can't allow that. Go ask alice.", nil
}