server.go 13.9 KB
Newer Older
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
package keyshareServerCore

import (
	"crypto/rand"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
	"sync"

	"github.com/privacybydesign/gabi"
	"github.com/privacybydesign/gabi/big"
	irma "github.com/privacybydesign/irmago"
	"github.com/sirupsen/logrus"

	"github.com/privacybydesign/irmago/keyshareCore"
	"github.com/privacybydesign/irmago/server"
	"github.com/privacybydesign/irmago/server/irmaserver"

	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
)

type SessionData struct {
	LastKeyid    irma.PublicKeyIdentifier
	LastCommitID uint64
}

type Server struct {
	conf *Configuration

	core          *keyshareCore.KeyshareCore
	sessionserver *irmaserver.Server
	db            KeyshareDB

	sessions    map[string]*SessionData
	sessionLock sync.Mutex
}

func New(conf *Configuration) (*Server, error) {
	var err error
	s := &Server{
		conf:     conf,
		sessions: map[string]*SessionData{},
	}

	// Do initial processing of configuration and create keyshare core
	s.core, err = processConfiguration(conf)
	if err != nil {
		return nil, err
	}

	// Load neccessary idemix keys into core, and ensure that future updates
	// to them are processed
	s.LoadIdemixKeys(conf.ServerConfiguration.IrmaConfiguration)
	conf.ServerConfiguration.IrmaConfiguration.UpdateListeners = append(
		conf.ServerConfiguration.IrmaConfiguration.UpdateListeners,
		s.LoadIdemixKeys)

	// Setup irma session server
	s.sessionserver, err = irmaserver.New(conf.ServerConfiguration)
	if err != nil {
		return nil, err
	}

68
69
	// Setup DB
	s.db = conf.DB
70
71
72
73
74
75
76
77
78
79

	return s, nil
}

func (s *Server) Handler() http.Handler {
	router := chi.NewRouter()
	router.Use(middleware.Logger)
	router.Post("/api/v1/client/register", s.handleRegister)
	router.Post("/api/v1/users/isAuthorized", s.handleValidate)
	router.Post("/api/v1/users/verify/pin", s.handleVerifyPin)
80
	router.Post("/api/v1/users/change/pin", s.handleChangePin)
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
	router.Post("/api/v1/prove/getCommitments", s.handleCommitments)
	router.Post("/api/v1/prove/getResponse", s.handleResponse)
	router.Mount("/irma/", s.sessionserver.HandlerFunc())
	return router
}

func (s *Server) LoadIdemixKeys(conf *irma.Configuration) {
	for _, issuer := range conf.Issuers {
		keyIds, err := conf.PublicKeyIndices(issuer.Identifier())
		if err != nil {
			s.conf.Logger.WithFields(logrus.Fields{"issuer": issuer, "error": err}).Warn("Could not find key ids for issuer")
			continue
		}
		for _, id := range keyIds {
			key, err := conf.PublicKey(issuer.Identifier(), id)
			if err != nil {
				s.conf.Logger.WithFields(logrus.Fields{"keyid": id, "error": err}).Warn("Could not fetch public key for issuer")
				continue
			}
			s.core.DangerousAddTrustedPublicKey(irma.PublicKeyIdentifier{Issuer: issuer.Identifier(), Counter: uint(id)}, key)
		}
	}
}

func (s *Server) handleCommitments(w http.ResponseWriter, r *http.Request) {
	// Read keys
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not read request body")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}
	var keys []irma.PublicKeyIdentifier
	err = json.Unmarshal(body, &keys)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not parse request body")
		s.conf.Logger.WithField("body", body).Debug("Malformed request data")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}
	if len(keys) == 0 {
		s.conf.Logger.Info("Malformed request: no keys over which to commit specified")
		server.WriteError(w, server.ErrorInvalidRequest, "No key specified")
		return
	}

	// Extract username and authorization from request
	username := r.Header.Get("X-IRMA-Keyshare-Username")
	authorization := r.Header.Get("Authorization")

	user, err := s.db.User(username)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"username": username, "error": err}).Warn("User not found in db")
		server.WriteError(w, server.ErrorUserNotRegistered, err.Error())
		return
	}

138
	// Generate commitments
139
	commitments, commitId, err := s.core.GenerateCommitments(user.Data().Coredata, authorization, keys)
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
	if err != nil {
		s.conf.Logger.WithField("error", err).Warn("Could not generate commitments for request")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}

	// Prepare output message format
	mappedCommitments := map[string]*gabi.ProofPCommitment{}
	for i, keyid := range keys {
		keyidV, err := keyid.MarshalText()
		if err != nil {
			s.conf.Logger.WithFields(logrus.Fields{"keyid": keyid, "error": err}).Error("Could not convert key identifier to string")
			server.WriteError(w, server.ErrorInternal, err.Error())
			return
		}
		mappedCommitments[string(keyidV)] = commitments[i]
	}

	// Store needed data for later requests.
	s.sessionLock.Lock()
	if _, ok := s.sessions[username]; !ok {
		s.sessions[username] = &SessionData{}
	}
	s.sessions[username].LastCommitID = commitId
	s.sessions[username].LastKeyid = keys[0]
	s.sessionLock.Unlock()

	// And send response
	server.WriteJson(w, proofPCommitmentMap{Commitments: mappedCommitments})
}

func (s *Server) handleResponse(w http.ResponseWriter, r *http.Request) {
	// Read challenge
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not read request body")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}
	challenge := new(big.Int)
	err = json.Unmarshal(body, challenge)
	if err != nil {
		s.conf.Logger.Info("Malformed request: could not parse challenge")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}

	// Extract username and authorization from request
	username := r.Header.Get("X-IRMA-Keyshare-Username")
	authorization := r.Header.Get("Authorization")

	// Fetch user
	user, err := s.db.User(username)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"username": username, "error": err}).Warn("Could not find user in db")
		server.WriteError(w, server.ErrorUserNotRegistered, err.Error())
		return
	}

	// verify access (avoids leaking information to unauthorized callers)
200
	err = s.core.ValidateJWT(user.Data().Coredata, authorization)
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
	if err != nil {
		s.conf.Logger.WithField("error", err).Warn("Could not generate keyshare response")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}

	// Get data from session
	s.sessionLock.Lock()
	sessionData, ok := s.sessions[username]
	s.sessionLock.Unlock()
	if !ok {
		s.conf.Logger.Warn("Request for response without previous call to get commitments")
		server.WriteError(w, server.ErrorInvalidRequest, "Missing previous call to getCommitments")
		return
	}

217
	proofResponse, err := s.core.GenerateResponse(user.Data().Coredata, authorization, sessionData.LastCommitID, challenge, sessionData.LastKeyid)
218
219
220
221
222
223
224
225
226
227
228
229
230
231
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not generate response for request")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}

	server.WriteString(w, proofResponse)
}

func (s *Server) handleValidate(w http.ResponseWriter, r *http.Request) {
	// Extract username and authorization from request
	username := r.Header.Get("X-IRMA-Keyshare-Username")
	authorization := r.Header.Get("Authorization")

232
	// Fetch user
233
234
235
236
237
238
239
	user, err := s.db.User(username)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"username": username, "error": err}).Warn("Could not find user in db")
		server.WriteError(w, server.ErrorUserNotRegistered, err.Error())
		return
	}

240
	// Validate jwt
241
	err = s.core.ValidateJWT(user.Data().Coredata, authorization)
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
	if err != nil {
		server.WriteJson(w, &keyshareAuthorization{Status: "expired", Candidates: []string{"pin"}})
	} else {
		server.WriteJson(w, &keyshareAuthorization{Status: "authorized", Candidates: []string{"pin"}})
	}
}

func (s *Server) handleVerifyPin(w http.ResponseWriter, r *http.Request) {
	// Extract request
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not read request body")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}
	var msg keysharePinMessage
	err = json.Unmarshal(body, &msg)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"error": err}).Info("Malformed request: could not parse request body")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}

	// Fetch user
	user, err := s.db.User(msg.Username)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"username": msg.Username, "error": err}).Warn("Could not find user in db")
		server.WriteError(w, server.ErrorUserNotRegistered, "")
		return
	}

273
274
	// And verify pin (checking that we are allowed to do this)
	ok, tries, wait, err := s.db.ReservePincheck(user)
275
	if err != nil {
276
277
278
279
280
281
282
283
		s.conf.Logger.WithField("error", err).Error("Could not reserve pin check slot")
		server.WriteError(w, server.ErrorInternal, err.Error())
		return
	}
	if !ok {
		server.WriteJson(w, keysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)})
		return
	}
284
	jwtt, err := s.core.ValidatePin(user.Data().Coredata, msg.Pin, msg.Username)
285
286
287
288
289
290
291
292
293
	if err == keyshareCore.ErrInvalidPin {
		if tries == 0 {
			server.WriteJson(w, keysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)})
		} else {
			server.WriteJson(w, keysharePinStatus{Status: "failure", Message: fmt.Sprintf("%v", tries)})
		}
	} else if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not validate pin")
		server.WriteError(w, server.ErrorInternal, err.Error())
294
	} else {
295
296
297
298
299
		err = s.db.ClearPincheck(user)
		if err != nil {
			s.conf.Logger.WithField("error", err).Error("Could not reset users pin check logic")
			// Do not send to user
		}
300
301
302
303
		server.WriteJson(w, keysharePinStatus{Status: "success", Message: jwtt})
	}
}

304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
func (s *Server) handleChangePin(w http.ResponseWriter, r *http.Request) {
	// Extract request
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not read request body")
		server.WriteError(w, server.ErrorInvalidRequest, "could not read request body")
		return
	}
	var msg keyshareChangepin
	err = json.Unmarshal(body, &msg)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not parse request body")
		server.WriteError(w, server.ErrorInvalidRequest, "Invalid request")
		return
	}

	// Fetch user
	user, err := s.db.User(msg.Username)
	if err != nil {
		s.conf.Logger.WithFields(logrus.Fields{"username": msg.Username, "error": err}).Warn("Could not find user in db")
		server.WriteError(w, server.ErrorUserNotRegistered, "")
		return
	}

328
329
	// And change pin, checking that we are allowed to do this
	ok, tries, wait, err := s.db.ReservePincheck(user)
330
	if err != nil {
331
332
		s.conf.Logger.WithField("error", err).Error("Could not reserve pin check slot")
		server.WriteError(w, server.ErrorInternal, err.Error())
333
334
		return
	}
335
336
337
338
	if !ok {
		server.WriteJson(w, keysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)})
		return
	}
339
	user.Data().Coredata, err = s.core.ChangePin(user.Data().Coredata, msg.OldPin, msg.NewPin)
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
	if err == keyshareCore.ErrInvalidPin {
		if tries == 0 {
			server.WriteJson(w, keysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)})
		} else {
			server.WriteJson(w, keysharePinStatus{Status: "failure", Message: fmt.Sprintf("%v", tries)})
		}
		return
	} else if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not change pin")
		server.WriteError(w, server.ErrorInternal, err.Error())
		return
	}
	err = s.db.ClearPincheck(user)
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not reset users pin check logic")
		// Do not send to user
	}
357
358
359
360
361
362
363
364
365
366
367
368
369

	// Write user back
	err = s.db.UpdateUser(user)
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not write updated user to database")
		server.WriteError(w, server.ErrorInternal, err.Error())
		return
	}

	// And return success
	server.WriteJson(w, keysharePinStatus{Status: "success"})
}

370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
func (s *Server) handleRegister(w http.ResponseWriter, r *http.Request) {
	// Extract request
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not read request body")
		server.WriteError(w, server.ErrorInvalidRequest, "could not read request body")
		return
	}
	var msg keyshareEnrollment
	err = json.Unmarshal(body, &msg)
	if err != nil {
		s.conf.Logger.WithField("error", err).Info("Malformed request: could not parse request body")
		server.WriteError(w, server.ErrorInvalidRequest, "Invalid request")
		return
	}

	// Generate keyshare server account
	username := generateUsername()
	coredata, err := s.core.GenerateKeyshareSecret(msg.Pin)
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not register user")
		server.WriteError(w, server.ErrorInvalidRequest, err.Error())
		return
	}
394
	err = s.db.NewUser(KeyshareUserData{Username: username, Coredata: coredata})
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not store new user in database")
		server.WriteError(w, server.ErrorInternal, err.Error())
		return
	}

	// Setup and return issuance session for keyshare credential.
	request := irma.NewIssuanceRequest([]*irma.CredentialRequest{
		{
			CredentialTypeID: irma.NewCredentialTypeIdentifier(s.conf.KeyshareCredential),
			Attributes: map[string]string{
				s.conf.KeyshareAttribute: username,
			},
		}})
	sessionptr, _, err := s.sessionserver.StartSession(request, nil)
	if err != nil {
		s.conf.Logger.WithField("error", err).Error("Could not start keyshare credential issuance sessions")
		server.WriteError(w, server.ErrorInternal, err.Error())
		return
	}
	server.WriteResponse(w, sessionptr, nil)
}

// Generate a base62 "username".
//  this is a direct port of what the old java server uses.
func generateUsername() string {
	bts := make([]byte, 8)
	_, err := rand.Read(bts)
	if err != nil {
		panic(err)
	}
	raw := make([]byte, 12)
	base64.StdEncoding.Encode(raw, bts)
	return strings.ReplaceAll(
		strings.ReplaceAll(
			strings.ReplaceAll(
				string(raw),
				"+",
				""),
			"/",
			""),
		"=",
		"")
}