117 lines
3.6 KiB
Go
117 lines
3.6 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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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
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package handlers
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import (
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"net/http"
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"strings"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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genericapirequest "k8s.io/apiserver/pkg/request"
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)
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var (
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authenticatedUserCounter = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "authenticated_user_requests",
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Help: "Counter of authenticated requests broken out by username.",
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},
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[]string{"username"},
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)
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)
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func init() {
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prometheus.MustRegister(authenticatedUserCounter)
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}
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// WithAuthentication creates an http handler that tries to authenticate the given request as a user, and then
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// stores any such user found onto the provided context for the request. If authentication fails or returns an error
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// the failed handler is used. On success, "Authorization" header is removed from the request and handler
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// is invoked to serve the request.
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func WithAuthentication(handler http.Handler, mapper genericapirequest.RequestContextMapper, auth authenticator.Request, failed http.Handler) http.Handler {
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if auth == nil {
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glog.Warningf("Authentication is disabled")
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return handler
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}
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return genericapirequest.WithRequestContext(
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http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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user, ok, err := auth.AuthenticateRequest(req)
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if err != nil || !ok {
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if err != nil {
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glog.Errorf("Unable to authenticate the request due to an error: %v", err)
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}
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failed.ServeHTTP(w, req)
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return
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}
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// authorization header is not required anymore in case of a successful authentication.
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req.Header.Del("Authorization")
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if ctx, ok := mapper.Get(req); ok {
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mapper.Update(req, genericapirequest.WithUser(ctx, user))
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}
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authenticatedUserCounter.WithLabelValues(compressUsername(user.GetName())).Inc()
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handler.ServeHTTP(w, req)
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}),
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mapper,
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)
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}
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func Unauthorized(supportsBasicAuth bool) http.HandlerFunc {
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if supportsBasicAuth {
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return unauthorizedBasicAuth
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}
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return unauthorized
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}
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// unauthorizedBasicAuth serves an unauthorized message to clients.
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func unauthorizedBasicAuth(w http.ResponseWriter, req *http.Request) {
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w.Header().Set("WWW-Authenticate", `Basic realm="kubernetes-master"`)
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http.Error(w, "Unauthorized", http.StatusUnauthorized)
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}
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// unauthorized serves an unauthorized message to clients.
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func unauthorized(w http.ResponseWriter, req *http.Request) {
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http.Error(w, "Unauthorized", http.StatusUnauthorized)
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}
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// compressUsername maps all possible usernames onto a small set of categories
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// of usernames. This is done both to limit the cardinality of the
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// authorized_user_requests metric, and to avoid pushing actual usernames in the
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// metric.
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func compressUsername(username string) string {
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switch {
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// Known internal identities.
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case username == "admin" ||
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username == "client" ||
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username == "kube_proxy" ||
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username == "kubelet" ||
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username == "system:serviceaccount:kube-system:default":
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return username
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// Probably an email address.
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case strings.Contains(username, "@"):
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return "email_id"
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// Anything else (custom service accounts, custom external identities, etc.)
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default:
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return "other"
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}
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}
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