-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
request.go
250 lines (220 loc) · 7.44 KB
/
request.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package audit
import (
"bytes"
"fmt"
"net/http"
"time"
"github.com/golang/glog"
"github.com/pborman/uuid"
"reflect"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
utilnet "k8s.io/apimachinery/pkg/util/net"
auditinternal "k8s.io/apiserver/pkg/apis/audit"
"k8s.io/apiserver/pkg/authentication/user"
"k8s.io/apiserver/pkg/authorization/authorizer"
)
const (
maxUserAgentLength = 1024
userAgentTruncateSuffix = "...TRUNCATED"
)
func NewEventFromRequest(req *http.Request, level auditinternal.Level, attribs authorizer.Attributes) (*auditinternal.Event, error) {
ev := &auditinternal.Event{
RequestReceivedTimestamp: metav1.NewMicroTime(time.Now()),
Verb: attribs.GetVerb(),
RequestURI: req.URL.RequestURI(),
UserAgent: maybeTruncateUserAgent(req),
Level: level,
}
// prefer the id from the headers. If not available, create a new one.
// TODO(audit): do we want to forbid the header for non-front-proxy users?
ids := req.Header.Get(auditinternal.HeaderAuditID)
if ids != "" {
ev.AuditID = types.UID(ids)
} else {
ev.AuditID = types.UID(uuid.NewRandom().String())
}
ips := utilnet.SourceIPs(req)
ev.SourceIPs = make([]string, len(ips))
for i := range ips {
ev.SourceIPs[i] = ips[i].String()
}
if user := attribs.GetUser(); user != nil {
ev.User.Username = user.GetName()
ev.User.Extra = map[string]auditinternal.ExtraValue{}
for k, v := range user.GetExtra() {
ev.User.Extra[k] = auditinternal.ExtraValue(v)
}
ev.User.Groups = user.GetGroups()
ev.User.UID = user.GetUID()
}
if attribs.IsResourceRequest() {
ev.ObjectRef = &auditinternal.ObjectReference{
Namespace: attribs.GetNamespace(),
Name: attribs.GetName(),
Resource: attribs.GetResource(),
Subresource: attribs.GetSubresource(),
APIGroup: attribs.GetAPIGroup(),
APIVersion: attribs.GetAPIVersion(),
}
}
return ev, nil
}
// LogImpersonatedUser fills in the impersonated user attributes into an audit event.
func LogImpersonatedUser(ae *auditinternal.Event, user user.Info) {
if ae == nil || ae.Level.Less(auditinternal.LevelMetadata) {
return
}
ae.ImpersonatedUser = &auditinternal.UserInfo{
Username: user.GetName(),
}
ae.ImpersonatedUser.Groups = user.GetGroups()
ae.ImpersonatedUser.UID = user.GetUID()
ae.ImpersonatedUser.Extra = map[string]auditinternal.ExtraValue{}
for k, v := range user.GetExtra() {
ae.ImpersonatedUser.Extra[k] = auditinternal.ExtraValue(v)
}
}
// LogRequestObject fills in the request object into an audit event. The passed runtime.Object
// will be converted to the given gv.
func LogRequestObject(ae *auditinternal.Event, obj runtime.Object, gvr schema.GroupVersionResource, subresource string, s runtime.NegotiatedSerializer) {
if ae == nil || ae.Level.Less(auditinternal.LevelMetadata) {
return
}
// complete ObjectRef
if ae.ObjectRef == nil {
ae.ObjectRef = &auditinternal.ObjectReference{}
}
if acc, ok := obj.(metav1.ObjectMetaAccessor); ok {
meta := acc.GetObjectMeta()
if len(ae.ObjectRef.Namespace) == 0 {
ae.ObjectRef.Namespace = meta.GetNamespace()
}
if len(ae.ObjectRef.Name) == 0 {
ae.ObjectRef.Name = meta.GetName()
}
if len(ae.ObjectRef.UID) == 0 {
ae.ObjectRef.UID = meta.GetUID()
}
if len(ae.ObjectRef.ResourceVersion) == 0 {
ae.ObjectRef.ResourceVersion = meta.GetResourceVersion()
}
}
if len(ae.ObjectRef.APIVersion) == 0 {
ae.ObjectRef.APIGroup = gvr.Group
ae.ObjectRef.APIVersion = gvr.Version
}
if len(ae.ObjectRef.Resource) == 0 {
ae.ObjectRef.Resource = gvr.Resource
}
if len(ae.ObjectRef.Subresource) == 0 {
ae.ObjectRef.Subresource = subresource
}
if ae.Level.Less(auditinternal.LevelRequest) {
return
}
// TODO(audit): hook into the serializer to avoid double conversion
var err error
ae.RequestObject, err = encodeObject(obj, gvr.GroupVersion(), s)
if err != nil {
// TODO(audit): add error slice to audit event struct
glog.Warningf("Auditing failed of %v request: %v", reflect.TypeOf(obj).Name(), err)
return
}
}
// LogRequestPatch fills in the given patch as the request object into an audit event.
func LogRequestPatch(ae *auditinternal.Event, patch []byte) {
if ae == nil || ae.Level.Less(auditinternal.LevelRequest) {
return
}
ae.RequestObject = &runtime.Unknown{
Raw: patch,
ContentType: runtime.ContentTypeJSON,
}
}
// LogResponseObject fills in the response object into an audit event. The passed runtime.Object
// will be converted to the given gv.
func LogResponseObject(ae *auditinternal.Event, obj runtime.Object, gv schema.GroupVersion, s runtime.NegotiatedSerializer) {
if ae == nil || ae.Level.Less(auditinternal.LevelMetadata) {
return
}
if status, ok := obj.(*metav1.Status); ok {
// selectively copy the bounded fields.
ae.ResponseStatus = &metav1.Status{
Status: status.Status,
Reason: status.Reason,
Code: status.Code,
}
}
if ae.Level.Less(auditinternal.LevelRequestResponse) {
return
}
// TODO(audit): hook into the serializer to avoid double conversion
var err error
ae.ResponseObject, err = encodeObject(obj, gv, s)
if err != nil {
glog.Warningf("Audit failed for %q response: %v", reflect.TypeOf(obj).Name(), err)
}
}
func encodeObject(obj runtime.Object, gv schema.GroupVersion, serializer runtime.NegotiatedSerializer) (*runtime.Unknown, error) {
supported := serializer.SupportedMediaTypes()
for i := range supported {
if supported[i].MediaType == "application/json" {
enc := serializer.EncoderForVersion(supported[i].Serializer, gv)
var buf bytes.Buffer
if err := enc.Encode(obj, &buf); err != nil {
return nil, fmt.Errorf("encoding failed: %v", err)
}
return &runtime.Unknown{
Raw: buf.Bytes(),
ContentType: runtime.ContentTypeJSON,
}, nil
}
}
return nil, fmt.Errorf("no json encoder found")
}
// LogAnnotation fills in the Annotations according to the key value pair.
func LogAnnotation(ae *auditinternal.Event, key, value string) {
if ae == nil || ae.Level.Less(auditinternal.LevelMetadata) {
return
}
if ae.Annotations == nil {
ae.Annotations = make(map[string]string)
}
if v, ok := ae.Annotations[key]; ok && v != value {
glog.Warningf("Failed to set annotations[%q] to %q for audit:%q, it has already been set to %q", key, value, ae.AuditID, ae.Annotations[key])
return
}
ae.Annotations[key] = value
}
// LogAnnotations fills in the Annotations according to the annotations map.
func LogAnnotations(ae *auditinternal.Event, annotations map[string]string) {
if ae == nil || ae.Level.Less(auditinternal.LevelMetadata) {
return
}
for key, value := range annotations {
LogAnnotation(ae, key, value)
}
}
// truncate User-Agent if too long, otherwise return it directly.
func maybeTruncateUserAgent(req *http.Request) string {
ua := req.UserAgent()
if len(ua) > maxUserAgentLength {
ua = ua[:maxUserAgentLength] + userAgentTruncateSuffix
}
return ua
}