mirror of https://github.com/k3s-io/k3s
665 lines
15 KiB
Go
665 lines
15 KiB
Go
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// Copyright 2015 The etcd Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package v2http
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import (
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"encoding/json"
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"net/http"
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"path"
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"strings"
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"go.etcd.io/etcd/etcdserver/api"
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"go.etcd.io/etcd/etcdserver/api/v2auth"
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"go.etcd.io/etcd/etcdserver/api/v2http/httptypes"
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"go.uber.org/zap"
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)
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type authHandler struct {
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lg *zap.Logger
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sec v2auth.Store
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cluster api.Cluster
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clientCertAuthEnabled bool
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}
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func hasWriteRootAccess(lg *zap.Logger, sec v2auth.Store, r *http.Request, clientCertAuthEnabled bool) bool {
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if r.Method == "GET" || r.Method == "HEAD" {
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return true
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}
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return hasRootAccess(lg, sec, r, clientCertAuthEnabled)
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}
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func userFromBasicAuth(lg *zap.Logger, sec v2auth.Store, r *http.Request) *v2auth.User {
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username, password, ok := r.BasicAuth()
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if !ok {
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if lg != nil {
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lg.Warn("malformed basic auth encoding")
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} else {
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plog.Warningf("auth: malformed basic auth encoding")
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}
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return nil
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}
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user, err := sec.GetUser(username)
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if err != nil {
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return nil
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}
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ok = sec.CheckPassword(user, password)
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if !ok {
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if lg != nil {
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lg.Warn("incorrect password", zap.String("user-name", username))
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} else {
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plog.Warningf("auth: incorrect password for user: %s", username)
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}
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return nil
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}
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return &user
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}
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func userFromClientCertificate(lg *zap.Logger, sec v2auth.Store, r *http.Request) *v2auth.User {
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if r.TLS == nil {
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return nil
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}
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for _, chains := range r.TLS.VerifiedChains {
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for _, chain := range chains {
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if lg != nil {
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lg.Debug("found common name", zap.String("common-name", chain.Subject.CommonName))
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} else {
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plog.Debugf("auth: found common name %s.\n", chain.Subject.CommonName)
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}
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user, err := sec.GetUser(chain.Subject.CommonName)
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if err == nil {
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if lg != nil {
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lg.Debug(
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"authenticated a user via common name",
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zap.String("user-name", user.User),
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zap.String("common-name", chain.Subject.CommonName),
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)
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} else {
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plog.Debugf("auth: authenticated user %s by cert common name.", user.User)
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}
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return &user
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}
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}
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}
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return nil
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}
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func hasRootAccess(lg *zap.Logger, sec v2auth.Store, r *http.Request, clientCertAuthEnabled bool) bool {
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if sec == nil {
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// No store means no auth available, eg, tests.
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return true
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}
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if !sec.AuthEnabled() {
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return true
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}
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var rootUser *v2auth.User
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if r.Header.Get("Authorization") == "" && clientCertAuthEnabled {
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rootUser = userFromClientCertificate(lg, sec, r)
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if rootUser == nil {
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return false
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}
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} else {
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rootUser = userFromBasicAuth(lg, sec, r)
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if rootUser == nil {
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return false
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}
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}
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for _, role := range rootUser.Roles {
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if role == v2auth.RootRoleName {
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return true
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}
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}
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if lg != nil {
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lg.Warn(
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"a user does not have root role for resource",
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zap.String("root-user", rootUser.User),
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zap.String("root-role-name", v2auth.RootRoleName),
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zap.String("resource-path", r.URL.Path),
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)
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} else {
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plog.Warningf("auth: user %s does not have the %s role for resource %s.", rootUser.User, v2auth.RootRoleName, r.URL.Path)
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}
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return false
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}
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func hasKeyPrefixAccess(lg *zap.Logger, sec v2auth.Store, r *http.Request, key string, recursive, clientCertAuthEnabled bool) bool {
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if sec == nil {
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// No store means no auth available, eg, tests.
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return true
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}
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if !sec.AuthEnabled() {
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return true
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}
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var user *v2auth.User
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if r.Header.Get("Authorization") == "" {
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if clientCertAuthEnabled {
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user = userFromClientCertificate(lg, sec, r)
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}
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if user == nil {
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return hasGuestAccess(lg, sec, r, key)
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}
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} else {
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user = userFromBasicAuth(lg, sec, r)
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if user == nil {
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return false
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}
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}
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writeAccess := r.Method != "GET" && r.Method != "HEAD"
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for _, roleName := range user.Roles {
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role, err := sec.GetRole(roleName)
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if err != nil {
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continue
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}
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if recursive {
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if role.HasRecursiveAccess(key, writeAccess) {
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return true
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}
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} else if role.HasKeyAccess(key, writeAccess) {
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return true
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}
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}
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if lg != nil {
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lg.Warn(
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"invalid access for user on key",
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zap.String("user-name", user.User),
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zap.String("key", key),
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)
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} else {
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plog.Warningf("auth: invalid access for user %s on key %s.", user.User, key)
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}
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return false
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}
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func hasGuestAccess(lg *zap.Logger, sec v2auth.Store, r *http.Request, key string) bool {
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writeAccess := r.Method != "GET" && r.Method != "HEAD"
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role, err := sec.GetRole(v2auth.GuestRoleName)
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if err != nil {
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return false
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}
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if role.HasKeyAccess(key, writeAccess) {
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return true
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}
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if lg != nil {
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lg.Warn(
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"invalid access for a guest role on key",
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zap.String("role-name", v2auth.GuestRoleName),
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zap.String("key", key),
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)
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} else {
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plog.Warningf("auth: invalid access for unauthenticated user on resource %s.", key)
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}
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return false
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}
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func writeNoAuth(lg *zap.Logger, w http.ResponseWriter, r *http.Request) {
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herr := httptypes.NewHTTPError(http.StatusUnauthorized, "Insufficient credentials")
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if err := herr.WriteTo(w); err != nil {
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if lg != nil {
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lg.Debug(
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"failed to write v2 HTTP error",
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zap.String("remote-addr", r.RemoteAddr),
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zap.Error(err),
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)
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} else {
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plog.Debugf("error writing HTTPError (%v) to %s", err, r.RemoteAddr)
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}
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}
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}
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func handleAuth(mux *http.ServeMux, sh *authHandler) {
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mux.HandleFunc(authPrefix+"/roles", authCapabilityHandler(sh.baseRoles))
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mux.HandleFunc(authPrefix+"/roles/", authCapabilityHandler(sh.handleRoles))
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mux.HandleFunc(authPrefix+"/users", authCapabilityHandler(sh.baseUsers))
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mux.HandleFunc(authPrefix+"/users/", authCapabilityHandler(sh.handleUsers))
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mux.HandleFunc(authPrefix+"/enable", authCapabilityHandler(sh.enableDisable))
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}
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func (sh *authHandler) baseRoles(w http.ResponseWriter, r *http.Request) {
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if !allowMethod(w, r.Method, "GET") {
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return
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}
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if !hasRootAccess(sh.lg, sh.sec, r, sh.clientCertAuthEnabled) {
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writeNoAuth(sh.lg, w, r)
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return
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}
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w.Header().Set("X-Etcd-Cluster-ID", sh.cluster.ID().String())
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w.Header().Set("Content-Type", "application/json")
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roles, err := sh.sec.AllRoles()
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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if roles == nil {
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roles = make([]string, 0)
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}
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err = r.ParseForm()
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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var rolesCollections struct {
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Roles []v2auth.Role `json:"roles"`
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}
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for _, roleName := range roles {
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var role v2auth.Role
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role, err = sh.sec.GetRole(roleName)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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rolesCollections.Roles = append(rolesCollections.Roles, role)
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}
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err = json.NewEncoder(w).Encode(rolesCollections)
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if err != nil {
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if sh.lg != nil {
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sh.lg.Warn(
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"failed to encode base roles",
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zap.String("url", r.URL.String()),
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zap.Error(err),
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)
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} else {
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plog.Warningf("baseRoles error encoding on %s", r.URL)
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}
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writeError(sh.lg, w, r, err)
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return
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}
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}
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func (sh *authHandler) handleRoles(w http.ResponseWriter, r *http.Request) {
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subpath := path.Clean(r.URL.Path[len(authPrefix):])
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// Split "/roles/rolename/command".
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// First item is an empty string, second is "roles"
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pieces := strings.Split(subpath, "/")
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if len(pieces) == 2 {
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sh.baseRoles(w, r)
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return
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}
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if len(pieces) != 3 {
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writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Invalid path"))
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return
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}
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sh.forRole(w, r, pieces[2])
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}
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func (sh *authHandler) forRole(w http.ResponseWriter, r *http.Request, role string) {
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if !allowMethod(w, r.Method, "GET", "PUT", "DELETE") {
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return
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}
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if !hasRootAccess(sh.lg, sh.sec, r, sh.clientCertAuthEnabled) {
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writeNoAuth(sh.lg, w, r)
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return
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}
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w.Header().Set("X-Etcd-Cluster-ID", sh.cluster.ID().String())
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w.Header().Set("Content-Type", "application/json")
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switch r.Method {
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case "GET":
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data, err := sh.sec.GetRole(role)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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err = json.NewEncoder(w).Encode(data)
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if err != nil {
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if sh.lg != nil {
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sh.lg.Warn(
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"failed to encode a role",
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zap.String("url", r.URL.String()),
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zap.Error(err),
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)
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} else {
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plog.Warningf("forRole error encoding on %s", r.URL)
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}
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return
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}
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return
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case "PUT":
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var in v2auth.Role
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err := json.NewDecoder(r.Body).Decode(&in)
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if err != nil {
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writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Invalid JSON in request body."))
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return
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}
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if in.Role != role {
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writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Role JSON name does not match the name in the URL"))
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return
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}
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var out v2auth.Role
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// create
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if in.Grant.IsEmpty() && in.Revoke.IsEmpty() {
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err = sh.sec.CreateRole(in)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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w.WriteHeader(http.StatusCreated)
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out = in
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} else {
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if !in.Permissions.IsEmpty() {
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writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Role JSON contains both permissions and grant/revoke"))
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return
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}
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out, err = sh.sec.UpdateRole(in)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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w.WriteHeader(http.StatusOK)
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}
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err = json.NewEncoder(w).Encode(out)
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if err != nil {
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if sh.lg != nil {
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sh.lg.Warn(
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"failed to encode a role",
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zap.String("url", r.URL.String()),
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zap.Error(err),
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)
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} else {
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plog.Warningf("forRole error encoding on %s", r.URL)
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}
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return
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}
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return
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case "DELETE":
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err := sh.sec.DeleteRole(role)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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}
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}
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type userWithRoles struct {
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User string `json:"user"`
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Roles []v2auth.Role `json:"roles,omitempty"`
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}
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type usersCollections struct {
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Users []userWithRoles `json:"users"`
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}
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func (sh *authHandler) baseUsers(w http.ResponseWriter, r *http.Request) {
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if !allowMethod(w, r.Method, "GET") {
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return
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}
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if !hasRootAccess(sh.lg, sh.sec, r, sh.clientCertAuthEnabled) {
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writeNoAuth(sh.lg, w, r)
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return
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}
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w.Header().Set("X-Etcd-Cluster-ID", sh.cluster.ID().String())
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w.Header().Set("Content-Type", "application/json")
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users, err := sh.sec.AllUsers()
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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if users == nil {
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users = make([]string, 0)
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}
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err = r.ParseForm()
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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ucs := usersCollections{}
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for _, userName := range users {
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var user v2auth.User
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user, err = sh.sec.GetUser(userName)
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if err != nil {
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writeError(sh.lg, w, r, err)
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return
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}
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uwr := userWithRoles{User: user.User}
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for _, roleName := range user.Roles {
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var role v2auth.Role
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||
|
role, err = sh.sec.GetRole(roleName)
|
||
|
if err != nil {
|
||
|
continue
|
||
|
}
|
||
|
uwr.Roles = append(uwr.Roles, role)
|
||
|
}
|
||
|
|
||
|
ucs.Users = append(ucs.Users, uwr)
|
||
|
}
|
||
|
err = json.NewEncoder(w).Encode(ucs)
|
||
|
|
||
|
if err != nil {
|
||
|
if sh.lg != nil {
|
||
|
sh.lg.Warn(
|
||
|
"failed to encode users",
|
||
|
zap.String("url", r.URL.String()),
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
} else {
|
||
|
plog.Warningf("baseUsers error encoding on %s", r.URL)
|
||
|
}
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (sh *authHandler) handleUsers(w http.ResponseWriter, r *http.Request) {
|
||
|
subpath := path.Clean(r.URL.Path[len(authPrefix):])
|
||
|
// Split "/users/username".
|
||
|
// First item is an empty string, second is "users"
|
||
|
pieces := strings.Split(subpath, "/")
|
||
|
if len(pieces) == 2 {
|
||
|
sh.baseUsers(w, r)
|
||
|
return
|
||
|
}
|
||
|
if len(pieces) != 3 {
|
||
|
writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Invalid path"))
|
||
|
return
|
||
|
}
|
||
|
sh.forUser(w, r, pieces[2])
|
||
|
}
|
||
|
|
||
|
func (sh *authHandler) forUser(w http.ResponseWriter, r *http.Request, user string) {
|
||
|
if !allowMethod(w, r.Method, "GET", "PUT", "DELETE") {
|
||
|
return
|
||
|
}
|
||
|
if !hasRootAccess(sh.lg, sh.sec, r, sh.clientCertAuthEnabled) {
|
||
|
writeNoAuth(sh.lg, w, r)
|
||
|
return
|
||
|
}
|
||
|
w.Header().Set("X-Etcd-Cluster-ID", sh.cluster.ID().String())
|
||
|
w.Header().Set("Content-Type", "application/json")
|
||
|
|
||
|
switch r.Method {
|
||
|
case "GET":
|
||
|
u, err := sh.sec.GetUser(user)
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
err = r.ParseForm()
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
uwr := userWithRoles{User: u.User}
|
||
|
for _, roleName := range u.Roles {
|
||
|
var role v2auth.Role
|
||
|
role, err = sh.sec.GetRole(roleName)
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
uwr.Roles = append(uwr.Roles, role)
|
||
|
}
|
||
|
err = json.NewEncoder(w).Encode(uwr)
|
||
|
|
||
|
if err != nil {
|
||
|
if sh.lg != nil {
|
||
|
sh.lg.Warn(
|
||
|
"failed to encode roles",
|
||
|
zap.String("url", r.URL.String()),
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
} else {
|
||
|
plog.Warningf("forUser error encoding on %s", r.URL)
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
return
|
||
|
|
||
|
case "PUT":
|
||
|
var u v2auth.User
|
||
|
err := json.NewDecoder(r.Body).Decode(&u)
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "Invalid JSON in request body."))
|
||
|
return
|
||
|
}
|
||
|
if u.User != user {
|
||
|
writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "User JSON name does not match the name in the URL"))
|
||
|
return
|
||
|
}
|
||
|
|
||
|
var (
|
||
|
out v2auth.User
|
||
|
created bool
|
||
|
)
|
||
|
|
||
|
if len(u.Grant) == 0 && len(u.Revoke) == 0 {
|
||
|
// create or update
|
||
|
if len(u.Roles) != 0 {
|
||
|
out, err = sh.sec.CreateUser(u)
|
||
|
} else {
|
||
|
// if user passes in both password and roles, we are unsure about his/her
|
||
|
// intention.
|
||
|
out, created, err = sh.sec.CreateOrUpdateUser(u)
|
||
|
}
|
||
|
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
} else {
|
||
|
// update case
|
||
|
if len(u.Roles) != 0 {
|
||
|
writeError(sh.lg, w, r, httptypes.NewHTTPError(http.StatusBadRequest, "User JSON contains both roles and grant/revoke"))
|
||
|
return
|
||
|
}
|
||
|
out, err = sh.sec.UpdateUser(u)
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if created {
|
||
|
w.WriteHeader(http.StatusCreated)
|
||
|
} else {
|
||
|
w.WriteHeader(http.StatusOK)
|
||
|
}
|
||
|
|
||
|
out.Password = ""
|
||
|
|
||
|
err = json.NewEncoder(w).Encode(out)
|
||
|
if err != nil {
|
||
|
if sh.lg != nil {
|
||
|
sh.lg.Warn(
|
||
|
"failed to encode a user",
|
||
|
zap.String("url", r.URL.String()),
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
} else {
|
||
|
plog.Warningf("forUser error encoding on %s", r.URL)
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
return
|
||
|
|
||
|
case "DELETE":
|
||
|
err := sh.sec.DeleteUser(user)
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
type enabled struct {
|
||
|
Enabled bool `json:"enabled"`
|
||
|
}
|
||
|
|
||
|
func (sh *authHandler) enableDisable(w http.ResponseWriter, r *http.Request) {
|
||
|
if !allowMethod(w, r.Method, "GET", "PUT", "DELETE") {
|
||
|
return
|
||
|
}
|
||
|
if !hasWriteRootAccess(sh.lg, sh.sec, r, sh.clientCertAuthEnabled) {
|
||
|
writeNoAuth(sh.lg, w, r)
|
||
|
return
|
||
|
}
|
||
|
w.Header().Set("X-Etcd-Cluster-ID", sh.cluster.ID().String())
|
||
|
w.Header().Set("Content-Type", "application/json")
|
||
|
isEnabled := sh.sec.AuthEnabled()
|
||
|
switch r.Method {
|
||
|
case "GET":
|
||
|
jsonDict := enabled{isEnabled}
|
||
|
err := json.NewEncoder(w).Encode(jsonDict)
|
||
|
if err != nil {
|
||
|
if sh.lg != nil {
|
||
|
sh.lg.Warn(
|
||
|
"failed to encode a auth state",
|
||
|
zap.String("url", r.URL.String()),
|
||
|
zap.Error(err),
|
||
|
)
|
||
|
} else {
|
||
|
plog.Warningf("error encoding auth state on %s", r.URL)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
case "PUT":
|
||
|
err := sh.sec.EnableAuth()
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
case "DELETE":
|
||
|
err := sh.sec.DisableAuth()
|
||
|
if err != nil {
|
||
|
writeError(sh.lg, w, r, err)
|
||
|
return
|
||
|
}
|
||
|
}
|
||
|
}
|