Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | Copyright 2017 The Kubernetes Authors. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package filters |
| 18 | |
| 19 | import ( |
| 20 | "errors" |
| 21 | "fmt" |
| 22 | "net/http" |
| 23 | "strings" |
| 24 | |
| 25 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 26 | utilruntime "k8s.io/apimachinery/pkg/util/runtime" |
| 27 | auditinternal "k8s.io/apiserver/pkg/apis/audit" |
| 28 | "k8s.io/apiserver/pkg/audit" |
| 29 | "k8s.io/apiserver/pkg/audit/policy" |
| 30 | "k8s.io/apiserver/pkg/endpoints/handlers/responsewriters" |
| 31 | ) |
| 32 | |
| 33 | // WithFailedAuthenticationAudit decorates a failed http.Handler used in WithAuthentication handler. |
| 34 | // It is meant to log only failed authentication requests. |
| 35 | func WithFailedAuthenticationAudit(failedHandler http.Handler, sink audit.Sink, policy policy.Checker) http.Handler { |
| 36 | if sink == nil || policy == nil { |
| 37 | return failedHandler |
| 38 | } |
| 39 | return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { |
| 40 | req, ev, omitStages, err := createAuditEventAndAttachToContext(req, policy) |
| 41 | if err != nil { |
| 42 | utilruntime.HandleError(fmt.Errorf("failed to create audit event: %v", err)) |
| 43 | responsewriters.InternalError(w, req, errors.New("failed to create audit event")) |
| 44 | return |
| 45 | } |
| 46 | if ev == nil { |
| 47 | failedHandler.ServeHTTP(w, req) |
| 48 | return |
| 49 | } |
| 50 | |
| 51 | ev.ResponseStatus = &metav1.Status{} |
| 52 | ev.ResponseStatus.Message = getAuthMethods(req) |
| 53 | ev.Stage = auditinternal.StageResponseStarted |
| 54 | |
| 55 | rw := decorateResponseWriter(w, ev, sink, omitStages) |
| 56 | failedHandler.ServeHTTP(rw, req) |
| 57 | }) |
| 58 | } |
| 59 | |
| 60 | func getAuthMethods(req *http.Request) string { |
| 61 | authMethods := []string{} |
| 62 | |
| 63 | if _, _, ok := req.BasicAuth(); ok { |
| 64 | authMethods = append(authMethods, "basic") |
| 65 | } |
| 66 | |
| 67 | auth := strings.TrimSpace(req.Header.Get("Authorization")) |
| 68 | parts := strings.Split(auth, " ") |
| 69 | if len(parts) > 1 && strings.ToLower(parts[0]) == "bearer" { |
| 70 | authMethods = append(authMethods, "bearer") |
| 71 | } |
| 72 | |
| 73 | token := strings.TrimSpace(req.URL.Query().Get("access_token")) |
| 74 | if len(token) > 0 { |
| 75 | authMethods = append(authMethods, "access_token") |
| 76 | } |
| 77 | |
| 78 | if req.TLS != nil && len(req.TLS.PeerCertificates) > 0 { |
| 79 | authMethods = append(authMethods, "x509") |
| 80 | } |
| 81 | |
| 82 | if len(authMethods) > 0 { |
| 83 | return fmt.Sprintf("Authentication failed, attempted: %s", strings.Join(authMethods, ", ")) |
| 84 | } |
| 85 | return "Authentication failed, no credentials provided" |
| 86 | } |