forked from vmware-archive/gangway
-
Notifications
You must be signed in to change notification settings - Fork 1
/
handlers.go
378 lines (327 loc) · 10.4 KB
/
handlers.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
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
// Copyright © 2017 Heptio
// Copyright © 2017 Craig Tracey
// 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 main
import (
"context"
"crypto/rand"
"encoding/base64"
"fmt"
htmltemplate "html/template"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/dgrijalva/jwt-go"
"github.com/ghodss/yaml"
"github.com/heptiolabs/gangway/internal/oidc"
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api/v1"
)
const (
templatesBase = "/templates"
)
// userInfo stores information about an authenticated user
type userInfo struct {
ClusterName string
Username string
KubeCfgUser string
IDToken string
RefreshToken string
ClientID string
ClientSecret string
IssuerURL string
APIServerURL string
ClusterCA string
HTTPPath string
}
// homeInfo is used to store dynamic properties on
type homeInfo struct {
HTTPPath string
}
func serveTemplate(tmplFile string, data interface{}, w http.ResponseWriter) {
var (
templatePath string
templateData []byte
err error
)
// Use custom templates if provided
if cfg.CustomHTMLTemplatesDir != "" {
templatePath = filepath.Join(cfg.CustomHTMLTemplatesDir, tmplFile)
templateData, err = ioutil.ReadFile(templatePath)
} else {
templatePath = filepath.Join(templatesBase, tmplFile)
// FSByte is generated by the esc file embedder
// See https://github.com/mjibson/esc for more info.
templateData, err = FSByte(false, templatePath)
}
if err != nil {
log.Errorf("Failed to find template asset: %s at path: %s", tmplFile, templatePath)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
tmpl := htmltemplate.New(tmplFile)
tmpl, err = tmpl.Parse(string(templateData))
if err != nil {
log.Errorf("Failed to parse template: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
tmpl.ExecuteTemplate(w, tmplFile, data)
}
func generateKubeConfig(cfg *userInfo) clientcmdapi.Config {
// fill out kubeconfig structure
kcfg := clientcmdapi.Config{
Kind: "Config",
APIVersion: "v1",
CurrentContext: cfg.ClusterName,
Clusters: []clientcmdapi.NamedCluster{
{
Name: cfg.ClusterName,
Cluster: clientcmdapi.Cluster{
Server: cfg.APIServerURL,
CertificateAuthorityData: []byte(cfg.ClusterCA),
},
},
},
Contexts: []clientcmdapi.NamedContext{
{
Name: cfg.ClusterName,
Context: clientcmdapi.Context{
Cluster: cfg.ClusterName,
AuthInfo: cfg.KubeCfgUser,
},
},
},
AuthInfos: []clientcmdapi.NamedAuthInfo{
{
Name: cfg.KubeCfgUser,
AuthInfo: clientcmdapi.AuthInfo{
AuthProvider: &clientcmdapi.AuthProviderConfig{
Name: "oidc",
Config: map[string]string{
"client-id": cfg.ClientID,
"client-secret": cfg.ClientSecret,
"id-token": cfg.IDToken,
"idp-issuer-url": cfg.IssuerURL,
"refresh-token": cfg.RefreshToken,
},
},
},
},
},
}
return kcfg
}
func loginRequired(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
session, err := gangwayUserSession.Session.Get(r, "gangway_id_token")
if err != nil {
http.Redirect(w, r, cfg.GetRootPathPrefix(), http.StatusTemporaryRedirect)
return
}
if session.Values["id_token"] == nil {
http.Redirect(w, r, cfg.GetRootPathPrefix(), http.StatusTemporaryRedirect)
return
}
next.ServeHTTP(w, r)
})
}
func homeHandler(w http.ResponseWriter, r *http.Request) {
data := &homeInfo{
HTTPPath: cfg.HTTPPath,
}
serveTemplate("home.tmpl", data, w)
}
func loginHandler(w http.ResponseWriter, r *http.Request) {
b := make([]byte, 32)
rand.Read(b)
state := base64.StdEncoding.EncodeToString(b)
session, err := gangwayUserSession.Session.Get(r, "gangway")
if err != nil {
log.Errorf("Got an error in login: %s", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
session.Values["state"] = state
err = session.Save(r, w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
audience := oauth2.SetAuthURLParam("audience", cfg.Audience)
url := oauth2Cfg.AuthCodeURL(state, audience)
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
func logoutHandler(w http.ResponseWriter, r *http.Request) {
gangwayUserSession.Cleanup(w, r, "gangway")
gangwayUserSession.Cleanup(w, r, "gangway_id_token")
gangwayUserSession.Cleanup(w, r, "gangway_refresh_token")
http.Redirect(w, r, cfg.GetRootPathPrefix(), http.StatusTemporaryRedirect)
}
func callbackHandler(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), oauth2.HTTPClient, transportConfig.HTTPClient)
// load up session cookies
session, err := gangwayUserSession.Session.Get(r, "gangway")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
sessionIDToken, err := gangwayUserSession.Session.Get(r, "gangway_id_token")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
sessionRefreshToken, err := gangwayUserSession.Session.Get(r, "gangway_refresh_token")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// verify the state string
state := r.URL.Query().Get("state")
if state != session.Values["state"] {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
return
}
// use the access code to retrieve a token
code := r.URL.Query().Get("code")
token, err := o2token.Exchange(ctx, code)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
sessionIDToken.Values["id_token"] = token.Extra("id_token")
sessionRefreshToken.Values["refresh_token"] = token.RefreshToken
// save the session cookies
err = session.Save(r, w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = sessionIDToken.Save(r, w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
err = sessionRefreshToken.Save(r, w)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
http.Redirect(w, r, fmt.Sprintf("%s/commandline", cfg.HTTPPath), http.StatusSeeOther)
}
func commandlineHandler(w http.ResponseWriter, r *http.Request) {
info := generateInfo(w, r)
if info == nil {
// generateInfo writes to the ResponseWriter if it encounters an error.
// TODO(abrand): Refactor this.
return
}
serveTemplate("commandline.tmpl", info, w)
}
func kubeConfigHandler(w http.ResponseWriter, r *http.Request) {
info := generateInfo(w, r)
if info == nil {
// generateInfo writes to the ResponseWriter if it encounters an error.
// TODO(abrand): Refactor this.
return
}
d, err := yaml.Marshal(generateKubeConfig(info))
if err != nil {
log.Errorf("Error creating kubeconfig - %s", err.Error())
http.Error(w, "Error creating kubeconfig", http.StatusInternalServerError)
return
}
// tell the browser the returned content should be downloaded
w.Header().Add("Content-Disposition", "Attachment")
w.Write(d)
}
func generateInfo(w http.ResponseWriter, r *http.Request) *userInfo {
// read in public ca.crt to output in commandline copy/paste commands
file, err := os.Open(cfg.ClusterCAPath)
if err != nil {
// let us know that we couldn't open the file. This only cause missing output
// does not impact actual function of program
log.Errorf("Failed to open CA file. %s", err)
}
defer file.Close()
caBytes, err := ioutil.ReadAll(file)
if err != nil {
log.Warningf("Could not read CA file: %s", err)
}
// load the session cookies
sessionIDToken, err := gangwayUserSession.Session.Get(r, "gangway_id_token")
if err != nil {
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return nil
}
sessionRefreshToken, err := gangwayUserSession.Session.Get(r, "gangway_refresh_token")
if err != nil {
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return nil
}
idToken, ok := sessionIDToken.Values["id_token"].(string)
if !ok {
gangwayUserSession.Cleanup(w, r, "gangway")
gangwayUserSession.Cleanup(w, r, "gangway_id_token")
gangwayUserSession.Cleanup(w, r, "gangway_refresh_token")
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return nil
}
refreshToken, ok := sessionRefreshToken.Values["refresh_token"].(string)
if !ok {
gangwayUserSession.Cleanup(w, r, "gangway")
gangwayUserSession.Cleanup(w, r, "gangway_id_token")
gangwayUserSession.Cleanup(w, r, "gangway_refresh_token")
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
return nil
}
jwtToken, err := oidc.ParseToken(idToken, cfg.ClientSecret)
if err != nil {
http.Error(w, "Could not parse JWT", http.StatusInternalServerError)
return nil
}
claims := jwtToken.Claims.(jwt.MapClaims)
username, ok := claims[cfg.UsernameClaim].(string)
if !ok {
http.Error(w, "Could not parse Username claim", http.StatusInternalServerError)
return nil
}
kubeCfgUser := strings.Join([]string{username, cfg.ClusterName}, "@")
if cfg.EmailClaim != "" {
log.Warn("using the Email Claim config setting is deprecated. Gangway uses `UsernameClaim@ClusterName`. This field will be removed in a future version.")
}
issuerURL, ok := claims["iss"].(string)
if !ok {
http.Error(w, "Could not parse Issuer URL claim", http.StatusInternalServerError)
return nil
}
if cfg.ClientSecret == "" {
log.Warn("Setting an empty Client Secret should only be done if you have no other option and is an inherent security risk.")
}
info := &userInfo{
ClusterName: cfg.ClusterName,
Username: username,
KubeCfgUser: kubeCfgUser,
IDToken: idToken,
RefreshToken: refreshToken,
ClientID: cfg.ClientID,
ClientSecret: cfg.ClientSecret,
IssuerURL: issuerURL,
APIServerURL: cfg.APIServerURL,
ClusterCA: string(caBytes),
HTTPPath: cfg.HTTPPath,
}
return info
}