// forbidden renders a simple forbidden error
func forbidden(reason string, attributes authorizer.AuthorizationAttributes, w http.ResponseWriter, req *http.Request) {
kind := ""
name := ""
// the attributes can be empty for two basic reasons:
// 1. malformed API request
// 2. not an API request at all
// In these cases, just assume default that will work better than nothing
if attributes != nil {
kind = attributes.GetResource()
if len(attributes.GetAPIGroup()) > 0 {
kind = attributes.GetAPIGroup() + "." + kind
}
name = attributes.GetResourceName()
}
// Reason is an opaque string that describes why access is allowed or forbidden (forbidden by the time we reach here).
// We don't have direct access to kind or name (not that those apply either in the general case)
// We create a NewForbidden to stay close the API, but then we override the message to get a serialization
// that makes sense when a human reads it.
forbiddenError, _ := kapierrors.NewForbidden(unversioned.GroupResource{Group: attributes.GetAPIGroup(), Resource: attributes.GetResource()}, name, errors.New("") /*discarded*/).(*kapierrors.StatusError)
forbiddenError.ErrStatus.Message = reason
formatted := &bytes.Buffer{}
output, err := runtime.Encode(kapi.Codecs.LegacyCodec(kapi.SchemeGroupVersion), &forbiddenError.ErrStatus)
if err != nil {
fmt.Fprintf(formatted, "%s", forbiddenError.Error())
} else {
json.Indent(formatted, output, "", " ")
}
w.Header().Set("Content-Type", restful.MIME_JSON)
w.WriteHeader(http.StatusForbidden)
w.Write(formatted.Bytes())
}
func (a *testAuthorizer) Authorize(ctx kapi.Context, attributes authorizer.AuthorizationAttributes) (allowed bool, reason string, err error) {
// allow the initial check for "can I run this RAR at all"
if attributes.GetResource() == "localresourceaccessreviews" {
return true, "", nil
}
return false, "", errors.New("Unsupported")
}
func (a *testAuthorizer) Authorize(ctx kapi.Context, attributes authorizer.AuthorizationAttributes) (allowed bool, reason string, err error) {
// allow the initial check for "can I run this RAR at all"
if attributes.GetResource() == "localresourceaccessreviews" {
if len(a.deniedNamespaces) != 0 && a.deniedNamespaces.Has(kapi.NamespaceValue(ctx)) {
return false, "denied initial check", nil
}
return true, "", nil
}
return false, "", errors.New("unsupported")
}
func (a *testAuthorizer) Authorize(ctx kapi.Context, passedAttributes authorizer.AuthorizationAttributes) (allowed bool, reason string, err error) {
// allow the initial check for "can I run this SAR at all"
if passedAttributes.GetResource() == "localsubjectaccessreviews" {
return true, "", nil
}
attributes, ok := passedAttributes.(authorizer.DefaultAuthorizationAttributes)
if !ok {
return false, "ERROR", errors.New("unexpected type for test")
}
a.actualAttributes = attributes
if len(a.err) == 0 {
return a.allowed, a.reason, nil
}
return a.allowed, a.reason, errors.New(a.err)
}
func getAction(namespace string, attributes authorizer.AuthorizationAttributes) authzapi.AuthorizationAttributes {
return authzapi.AuthorizationAttributes{
Namespace: namespace,
Verb: attributes.GetVerb(),
Group: attributes.GetAPIGroup(),
Version: attributes.GetAPIVersion(),
Resource: attributes.GetResource(),
ResourceName: attributes.GetResourceName(),
// TODO: missing from authorizer.AuthorizationAttributes:
// Content
// TODO: missing from authzapi.AuthorizationAttributes
// RequestAttributes (unserializable?)
// IsNonResourceURL
// URL (doesn't make sense for remote authz?)
}
}
// forbidden renders a simple forbidden error
func forbidden(reason string, attributes authorizer.AuthorizationAttributes, w http.ResponseWriter, req *http.Request) {
kind := ""
name := ""
apiVersion := klatest.DefaultVersionForLegacyGroup()
// the attributes can be empty for two basic reasons:
// 1. malformed API request
// 2. not an API request at all
// In these cases, just assume default that will work better than nothing
if attributes != nil {
apiVersion = attributes.GetAPIVersion()
kind = attributes.GetResource()
if len(attributes.GetAPIGroup()) > 0 {
kind = attributes.GetAPIGroup() + "." + kind
}
name = attributes.GetResourceName()
}
// Reason is an opaque string that describes why access is allowed or forbidden (forbidden by the time we reach here).
// We don't have direct access to kind or name (not that those apply either in the general case)
// We create a NewForbidden to stay close the API, but then we override the message to get a serialization
// that makes sense when a human reads it.
forbiddenError, _ := kapierrors.NewForbidden(kind, name, errors.New("") /*discarded*/).(*kapierrors.StatusError)
forbiddenError.ErrStatus.Message = reason
// Not all API versions in valid API requests will have a matching codec in kubernetes. If we can't find one,
// just default to the latest kube codec.
codec := klatest.CodecForLegacyGroup()
if requestedCodec, err := klatest.InterfacesForLegacyGroup(apiVersion); err == nil {
codec = requestedCodec
}
formatted := &bytes.Buffer{}
output, err := codec.Encode(&forbiddenError.ErrStatus)
if err != nil {
fmt.Fprintf(formatted, "%s", forbiddenError.Error())
} else {
json.Indent(formatted, output, "", " ")
}
w.Header().Set("Content-Type", restful.MIME_JSON)
w.WriteHeader(http.StatusForbidden)
w.Write(formatted.Bytes())
}
func (impersonateAuthorizer) Authorize(ctx kapi.Context, a authorizer.AuthorizationAttributes) (allowed bool, reason string, err error) {
user, exists := kapi.UserFrom(ctx)
if !exists {
return false, "missing user", nil
}
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()) == 1 && user.GetGroups()[0] == "wheel" && a.GetVerb() == "impersonate" && a.GetResource() == "systemusers" {
return true, "", nil
}
if len(user.GetGroups()) == 1 && user.GetGroups()[0] == "sa-impersonater" && a.GetVerb() == "impersonate" && a.GetResource() == "serviceaccounts" {
return true, "", nil
}
if len(user.GetGroups()) == 1 && user.GetGroups()[0] == "regular-impersonater" && a.GetVerb() == "impersonate" && a.GetResource() == "users" {
return true, "", nil
}
return false, "deny by default", nil
}
func cacheKey(ctx kapi.Context, a authorizer.AuthorizationAttributes) (string, error) {
if a.GetRequestAttributes() != nil {
// TODO: see if we can serialize this?
return "", errors.New("cannot cache request attributes")
}
keyData := map[string]interface{}{
"verb": a.GetVerb(),
"apiVersion": a.GetAPIVersion(),
"apiGroup": a.GetAPIGroup(),
"resource": a.GetResource(),
"resourceName": a.GetResourceName(),
"nonResourceURL": a.IsNonResourceURL(),
"url": a.GetURL(),
}
if namespace, ok := kapi.NamespaceFrom(ctx); ok {
keyData["namespace"] = namespace
}
if user, ok := kapi.UserFrom(ctx); ok {
keyData["user"] = user.GetName()
keyData["groups"] = user.GetGroups()
}
key, err := json.Marshal(keyData)
return string(key), err
}