requests.go 16.1 KB
Newer Older
1
package irma
2
3
4

import (
	"fmt"
5
	"io/ioutil"
6
7
8
	"strconv"
	"time"

9
	"github.com/bwesterb/go-atum"
Sietse Ringers's avatar
Sietse Ringers committed
10
	"github.com/go-errors/errors"
11
	"github.com/privacybydesign/gabi/big"
12
	"github.com/privacybydesign/irmago/internal/fs"
Sietse Ringers's avatar
Sietse Ringers committed
13
)
14

15
16
// BaseRequest contains the context and nonce for an IRMA session.
type BaseRequest struct {
17
18
19
	Context *big.Int `json:"context"`
	Nonce   *big.Int `json:"nonce"`
	Type    Action   `json:"type"`
20

21
22
23
	Candidates [][]*AttributeIdentifier `json:"-"`
	Choice     *DisclosureChoice        `json:"-"`
	Ids        *IrmaIdentifierSet       `json:"-"`
24

25
	Version *ProtocolVersion `json:"protocolVersion"`
Sietse Ringers's avatar
Sietse Ringers committed
26
27
}

28
func (sr *BaseRequest) SetCandidates(candidates [][]*AttributeIdentifier) {
29
30
31
	sr.Candidates = candidates
}

32
// DisclosureChoice returns the attributes to be disclosed in this session.
33
func (sr *BaseRequest) DisclosureChoice() *DisclosureChoice {
34
	return sr.Choice
Sietse Ringers's avatar
Sietse Ringers committed
35
36
}

37
// SetDisclosureChoice sets the attributes to be disclosed in this session.
38
func (sr *BaseRequest) SetDisclosureChoice(choice *DisclosureChoice) {
39
	sr.Choice = choice
40
41
}

42
// ...
43
func (sr *BaseRequest) SetVersion(v *ProtocolVersion) {
44
	sr.Version = v
45
46
47
}

// ...
48
func (sr *BaseRequest) GetVersion() *ProtocolVersion {
49
	return sr.Version
50
51
}

Sietse Ringers's avatar
Sietse Ringers committed
52
// A DisclosureRequest is a request to disclose certain attributes.
53
type DisclosureRequest struct {
54
	BaseRequest
55
56
57
	Content AttributeDisjunctionList `json:"content"`
}

Sietse Ringers's avatar
Sietse Ringers committed
58
// A SignatureRequest is a a request to sign a message with certain attributes.
59
60
type SignatureRequest struct {
	DisclosureRequest
61
62
63
	Message string `json:"message"`

	// Session state
64
	Timestamp *atum.Timestamp `json:"-"`
65
66
}

Sietse Ringers's avatar
Sietse Ringers committed
67
68
// An IssuanceRequest is a request to issue certain credentials,
// optionally also asking for certain attributes to be simultaneously disclosed.
69
type IssuanceRequest struct {
70
	BaseRequest
Tomas's avatar
Tomas committed
71
72
73
74
75
	Credentials []*CredentialRequest     `json:"credentials"`
	Disclose    AttributeDisjunctionList `json:"disclose"`

	// Derived data
	CredentialInfoList        CredentialInfoList `json:",omitempty"`
Sietse Ringers's avatar
Sietse Ringers committed
76
	RemovalCredentialInfoList CredentialInfoList
77
78
}

Sietse Ringers's avatar
Sietse Ringers committed
79
80
// A CredentialRequest contains the attributes and metadata of a credential
// that will be issued in an IssuanceRequest.
81
type CredentialRequest struct {
82
83
84
85
	Validity         *Timestamp               `json:"validity"`
	KeyCounter       int                      `json:"keyCounter"`
	CredentialTypeID CredentialTypeIdentifier `json:"credential"`
	Attributes       map[string]string        `json:"attributes"`
Sietse Ringers's avatar
Sietse Ringers committed
86
87
}

Sietse Ringers's avatar
Sietse Ringers committed
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
// ServerJwt contains standard JWT fields.
type ServerJwt struct {
	Type       string    `json:"sub"`
	ServerName string    `json:"iss"`
	IssuedAt   Timestamp `json:"iat"`
}

// A ServiceProviderRequest contains a disclosure request.
type ServiceProviderRequest struct {
	Request *DisclosureRequest `json:"request"`
}

// A SignatureRequestorRequest contains a signing request.
type SignatureRequestorRequest struct {
	Request *SignatureRequest `json:"request"`
}

// An IdentityProviderRequest contains an issuance request.
type IdentityProviderRequest struct {
	Request *IssuanceRequest `json:"request"`
}

// ServiceProviderJwt is a requestor JWT for a disclosure session.
type ServiceProviderJwt struct {
	ServerJwt
	Request ServiceProviderRequest `json:"sprequest"`
}

// SignatureRequestorJwt is a requestor JWT for a signing session.
type SignatureRequestorJwt struct {
	ServerJwt
	Request SignatureRequestorRequest `json:"absrequest"`
}

// IdentityProviderJwt is a requestor JWT for issuance session.
type IdentityProviderJwt struct {
	ServerJwt
	Request IdentityProviderRequest `json:"iprequest"`
}

128
129
// SessionRequest is an IRMA session.
type SessionRequest interface {
130
	Validator
131
132
133
134
	GetNonce() *big.Int
	SetNonce(*big.Int)
	GetContext() *big.Int
	SetContext(*big.Int)
135
	GetVersion() *ProtocolVersion
136
	SetVersion(*ProtocolVersion)
137
	ToDisclose() AttributeDisjunctionList
138
139
	DisclosureChoice() *DisclosureChoice
	SetDisclosureChoice(choice *DisclosureChoice)
140
	SetCandidates(candidates [][]*AttributeIdentifier)
141
	Identifiers() *IrmaIdentifierSet
142
	Action() Action
143
144
}

Sietse Ringers's avatar
Sietse Ringers committed
145
146
147
// Timestamp is a time.Time that marshals to Unix timestamps.
type Timestamp time.Time

148
149
func (cr *CredentialRequest) Info(conf *Configuration, metadataVersion byte) (*CredentialInfo, error) {
	list, err := cr.AttributeList(conf, metadataVersion)
150
151
152
	if err != nil {
		return nil, err
	}
153
	return NewCredentialInfo(list.Ints, conf), nil
154
155
}

156
157
158
159
// Validate checks that this credential request is consistent with the specified Configuration:
// the credential type is known, all required attributes are present and no unknown attributes
// are given.
func (cr *CredentialRequest) Validate(conf *Configuration) error {
160
	credtype := conf.CredentialTypes[cr.CredentialTypeID]
Sietse Ringers's avatar
Sietse Ringers committed
161
	if credtype == nil {
162
		return errors.New("Credential request of unknown credential type")
Sietse Ringers's avatar
Sietse Ringers committed
163
	}
164
165
166
167
168

	// Check that there are no attributes in the credential request that aren't
	// in the credential descriptor.
	for crName := range cr.Attributes {
		found := false
169
		for _, ad := range credtype.AttributeTypes {
170
171
172
173
174
175
			if ad.ID == crName {
				found = true
				break
			}
		}
		if !found {
176
			return errors.New("Credential request contaiins unknown attribute")
177
		}
Sietse Ringers's avatar
Sietse Ringers committed
178
179
	}

180
	for _, attrtype := range credtype.AttributeTypes {
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
		if _, present := cr.Attributes[attrtype.ID]; !present && attrtype.Optional != "true" {
			return errors.New("Required attribute not present in credential request")
		}
	}

	return nil
}

// AttributeList returns the list of attributes from this credential request.
func (cr *CredentialRequest) AttributeList(conf *Configuration, metadataVersion byte) (*AttributeList, error) {
	if err := cr.Validate(conf); err != nil {
		return nil, err
	}

	// Compute metadata attribute
	meta := NewMetadataAttribute(metadataVersion)
	meta.setKeyCounter(cr.KeyCounter)
	meta.setCredentialTypeIdentifier(cr.CredentialTypeID.String())
	meta.setSigningDate()
	if err := meta.setExpiryDate(cr.Validity); err != nil {
		return nil, err
	}

	// Compute other attributes
205
	credtype := conf.CredentialTypes[cr.CredentialTypeID]
206
	attrs := make([]*big.Int, len(credtype.AttributeTypes)+1)
Sietse Ringers's avatar
Sietse Ringers committed
207
	attrs[0] = meta.Int
208
	for i, attrtype := range credtype.AttributeTypes {
209
		attrs[i+1] = new(big.Int)
Sietse Ringers's avatar
Sietse Ringers committed
210
		if str, present := cr.Attributes[attrtype.ID]; present {
211
			// Set attribute to str << 1 + 1
212
			attrs[i+1].SetBytes([]byte(str))
213
214
215
216
			if meta.Version() >= 0x03 {
				attrs[i+1].Lsh(attrs[i+1], 1)             // attr <<= 1
				attrs[i+1].Add(attrs[i+1], big.NewInt(1)) // attr += 1
			}
Sietse Ringers's avatar
Sietse Ringers committed
217
218
219
		}
	}

220
	return NewAttributeListFromInts(attrs, conf), nil
Sietse Ringers's avatar
Sietse Ringers committed
221
222
}

Sietse Ringers's avatar
Sietse Ringers committed
223
func (ir *IssuanceRequest) Identifiers() *IrmaIdentifierSet {
224
225
	if ir.Ids == nil {
		ir.Ids = &IrmaIdentifierSet{
226
227
228
229
			SchemeManagers:  map[SchemeManagerIdentifier]struct{}{},
			Issuers:         map[IssuerIdentifier]struct{}{},
			CredentialTypes: map[CredentialTypeIdentifier]struct{}{},
			PublicKeys:      map[IssuerIdentifier][]int{},
Sietse Ringers's avatar
Sietse Ringers committed
230
231
		}

Sietse Ringers's avatar
Sietse Ringers committed
232
		for _, credreq := range ir.Credentials {
Sietse Ringers's avatar
Sietse Ringers committed
233
			issuer := credreq.CredentialTypeID.IssuerIdentifier()
234
235
			ir.Ids.SchemeManagers[issuer.SchemeManagerIdentifier()] = struct{}{}
			ir.Ids.Issuers[issuer] = struct{}{}
236
			ir.Ids.CredentialTypes[credreq.CredentialTypeID] = struct{}{}
237
238
			if ir.Ids.PublicKeys[issuer] == nil {
				ir.Ids.PublicKeys[issuer] = []int{}
239
			}
240
			ir.Ids.PublicKeys[issuer] = append(ir.Ids.PublicKeys[issuer], credreq.KeyCounter)
241
242
		}

Sietse Ringers's avatar
Sietse Ringers committed
243
		for _, disjunction := range ir.Disclose {
244
			for _, attr := range disjunction.Attributes {
Sietse Ringers's avatar
Sietse Ringers committed
245
246
247
248
249
250
				var cti CredentialTypeIdentifier
				if !attr.IsCredential() {
					cti = attr.CredentialTypeIdentifier()
				} else {
					cti = NewCredentialTypeIdentifier(attr.String())
				}
251
252
253
				ir.Ids.SchemeManagers[cti.IssuerIdentifier().SchemeManagerIdentifier()] = struct{}{}
				ir.Ids.Issuers[cti.IssuerIdentifier()] = struct{}{}
				ir.Ids.CredentialTypes[cti] = struct{}{}
254
			}
Sietse Ringers's avatar
Sietse Ringers committed
255
256
		}
	}
257
	return ir.Ids
Sietse Ringers's avatar
Sietse Ringers committed
258
259
}

Sietse Ringers's avatar
Sietse Ringers committed
260
// ToDisclose returns the attributes that must be disclosed in this issuance session.
261
262
263
264
265
266
267
func (ir *IssuanceRequest) ToDisclose() AttributeDisjunctionList {
	if ir.Disclose == nil {
		return AttributeDisjunctionList{}
	}

	return ir.Disclose
}
Sietse Ringers's avatar
Sietse Ringers committed
268

Tomas's avatar
Tomas committed
269
270
271
272
273
274
275
276
277
278
279
280
281
func (ir *IssuanceRequest) GetCredentialInfoList(conf *Configuration, version *ProtocolVersion) (CredentialInfoList, error) {
	if ir.CredentialInfoList == nil {
		for _, credreq := range ir.Credentials {
			info, err := credreq.Info(conf, GetMetadataVersion(version))
			if err != nil {
				return nil, err
			}
			ir.CredentialInfoList = append(ir.CredentialInfoList, info)
		}
	}
	return ir.CredentialInfoList, nil
}

Sietse Ringers's avatar
Sietse Ringers committed
282
283
284
285
286
287
288
289
290
291
292
293
// GetContext returns the context of this session.
func (ir *IssuanceRequest) GetContext() *big.Int { return ir.Context }

// SetContext sets the context of this session.
func (ir *IssuanceRequest) SetContext(context *big.Int) { ir.Context = context }

// GetNonce returns the nonce of this session.
func (ir *IssuanceRequest) GetNonce() *big.Int { return ir.Nonce }

// SetNonce sets the nonce of this session.
func (ir *IssuanceRequest) SetNonce(nonce *big.Int) { ir.Nonce = nonce }

294
295
func (ir *IssuanceRequest) Action() Action { return ActionIssuing }

296
297
298
299
300
301
302
303
304
305
func (ir *IssuanceRequest) Validate() error {
	if ir.Type != ActionIssuing {
		return errors.New("Not an issuance request")
	}
	if len(ir.Credentials) == 0 {
		return errors.New("Empty issuance request")
	}
	return nil
}

306
func (dr *DisclosureRequest) Identifiers() *IrmaIdentifierSet {
307
308
	if dr.Ids == nil {
		dr.Ids = &IrmaIdentifierSet{
309
310
311
312
			SchemeManagers:  map[SchemeManagerIdentifier]struct{}{},
			Issuers:         map[IssuerIdentifier]struct{}{},
			CredentialTypes: map[CredentialTypeIdentifier]struct{}{},
			PublicKeys:      map[IssuerIdentifier][]int{},
Sietse Ringers's avatar
Sietse Ringers committed
313
		}
314
315
		for _, disjunction := range dr.Content {
			for _, attr := range disjunction.Attributes {
316
317
318
				dr.Ids.SchemeManagers[attr.CredentialTypeIdentifier().IssuerIdentifier().SchemeManagerIdentifier()] = struct{}{}
				dr.Ids.Issuers[attr.CredentialTypeIdentifier().IssuerIdentifier()] = struct{}{}
				dr.Ids.CredentialTypes[attr.CredentialTypeIdentifier()] = struct{}{}
319
			}
Sietse Ringers's avatar
Sietse Ringers committed
320
321
		}
	}
322
	return dr.Ids
Sietse Ringers's avatar
Sietse Ringers committed
323
324
}

Sietse Ringers's avatar
Sietse Ringers committed
325
326
// ToDisclose returns the attributes to be disclosed in this session.
func (dr *DisclosureRequest) ToDisclose() AttributeDisjunctionList { return dr.Content }
Sietse Ringers's avatar
Sietse Ringers committed
327
328
329
330
331
332
333
334
335
336
337
338
339

// GetContext returns the context of this session.
func (dr *DisclosureRequest) GetContext() *big.Int { return dr.Context }

// SetContext sets the context of this session.
func (dr *DisclosureRequest) SetContext(context *big.Int) { dr.Context = context }

// GetNonce returns the nonce of this session.
func (dr *DisclosureRequest) GetNonce() *big.Int { return dr.Nonce }

// SetNonce sets the nonce of this session.
func (dr *DisclosureRequest) SetNonce(nonce *big.Int) { dr.Nonce = nonce }

340
341
func (dr *DisclosureRequest) Action() Action { return ActionDisclosing }

342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
func (dr *DisclosureRequest) Validate() error {
	if dr.Type != ActionDisclosing {
		return errors.New("Not a disclosure request")
	}
	if len(dr.Content) == 0 {
		return errors.New("Disclosure request had no attributes")
	}
	for _, disjunction := range dr.Content {
		if len(disjunction.Attributes) == 0 {
			return errors.New("Disclosure request had an empty disjunction")
		}
	}
	return nil
}

Sietse Ringers's avatar
Sietse Ringers committed
357
358
// GetNonce returns the nonce of this signature session
// (with the message already hashed into it).
359
func (sr *SignatureRequest) GetNonce() *big.Int {
360
	return ASN1ConvertSignatureNonce(sr.Message, sr.Nonce, sr.Timestamp)
361
362
}

363
func (sr *SignatureRequest) SignatureFromMessage(message interface{}) (*SignedMessage, error) {
364
	signature, ok := message.(*Disclosure)
365
366
367
368
369

	if !ok {
		return nil, errors.Errorf("Type assertion failed")
	}

370
	return &SignedMessage{
371
		Signature: signature.Proofs,
372
373
374
		Nonce:     sr.Nonce,
		Context:   sr.Context,
		Message:   sr.Message,
375
		Timestamp: sr.Timestamp,
376
377
378
	}, nil
}

379
380
func (sr *SignatureRequest) Action() Action { return ActionSigning }

381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
func (sr *SignatureRequest) Validate() error {
	if sr.Type != ActionSigning {
		return errors.New("Not a signature request")
	}
	if sr.Message == "" {
		return errors.New("Signature request had empty message")
	}
	if len(sr.Content) == 0 {
		return errors.New("Disclosure request had no attributes")
	}
	for _, disjunction := range sr.Content {
		if len(disjunction.Attributes) == 0 {
			return errors.New("Disclosure request had an empty disjunction")
		}
	}
	return nil
}

399
400
401
402
403
// Check if Timestamp is before other Timestamp. Used for checking expiry of attributes
func (t Timestamp) Before(u Timestamp) bool {
	return time.Time(t).Before(time.Time(u))
}

404
405
406
407
func (t Timestamp) After(u Timestamp) bool {
	return time.Time(t).After(time.Time(u))
}

408
409
// MarshalJSON marshals a timestamp.
func (t *Timestamp) MarshalJSON() ([]byte, error) {
410
	return []byte(t.String()), nil
411
412
413
414
415
416
417
418
419
420
421
}

// UnmarshalJSON unmarshals a timestamp.
func (t *Timestamp) UnmarshalJSON(b []byte) error {
	ts, err := strconv.Atoi(string(b))
	if err != nil {
		return err
	}
	*t = Timestamp(time.Unix(int64(ts), 0))
	return nil
}
Sietse Ringers's avatar
Sietse Ringers committed
422

423
424
425
426
427
// Timestamp implements Stringer.
func (t *Timestamp) String() string {
	return fmt.Sprint(time.Time(*t).Unix())
}

428
429
430
431
432
433
434
435
func readTimestamp(path string) (*Timestamp, bool, error) {
	exists, err := fs.PathExists(path)
	if err != nil {
		return nil, false, err
	}
	if !exists {
		return nil, false, nil
	}
436
437
	bts, err := ioutil.ReadFile(path)
	if err != nil {
438
		return nil, true, errors.New("Could not read scheme manager timestamp")
439
	}
440
441
	ts, err := parseTimestamp(bts)
	return ts, true, err
442
443
}

444
func parseTimestamp(bts []byte) (*Timestamp, error) {
445
446
447
448
449
450
	// Remove final character \n if present
	if bts[len(bts)-1] == '\n' {
		bts = bts[:len(bts)-1]
	}
	// convert from byte slice to string; parse as int
	str, err := strconv.ParseInt(string(bts), 10, 64)
451
	if err != nil {
452
		return nil, err
453
	}
454
455
	ts := Timestamp(time.Unix(str, 0))
	return &ts, nil
456
457
}

Sietse Ringers's avatar
Sietse Ringers committed
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
// NewServiceProviderJwt returns a new ServiceProviderJwt.
func NewServiceProviderJwt(servername string, dr *DisclosureRequest) *ServiceProviderJwt {
	return &ServiceProviderJwt{
		ServerJwt: ServerJwt{
			ServerName: servername,
			IssuedAt:   Timestamp(time.Now()),
			Type:       "verification_request",
		},
		Request: ServiceProviderRequest{Request: dr},
	}
}

// NewSignatureRequestorJwt returns a new SignatureRequestorJwt.
func NewSignatureRequestorJwt(servername string, sr *SignatureRequest) *SignatureRequestorJwt {
	return &SignatureRequestorJwt{
		ServerJwt: ServerJwt{
			ServerName: servername,
			IssuedAt:   Timestamp(time.Now()),
			Type:       "signature_request",
		},
		Request: SignatureRequestorRequest{Request: sr},
	}
}

// NewIdentityProviderJwt returns a new IdentityProviderJwt.
func NewIdentityProviderJwt(servername string, ir *IssuanceRequest) *IdentityProviderJwt {
	return &IdentityProviderJwt{
		ServerJwt: ServerJwt{
			ServerName: servername,
			IssuedAt:   Timestamp(time.Now()),
			Type:       "issue_request",
		},
		Request: IdentityProviderRequest{Request: ir},
	}
}

// A RequestorJwt contains an IRMA session object.
type RequestorJwt interface {
496
	Action() Action
497
	SessionRequest() SessionRequest
498
	Requestor() string
499
	Valid() error
Sietse Ringers's avatar
Sietse Ringers committed
500
501
}

502
503
func (jwt *ServerJwt) Requestor() string { return jwt.ServerName }

504
505
// SessionRequest returns an IRMA session object.
func (jwt *ServiceProviderJwt) SessionRequest() SessionRequest { return jwt.Request.Request }
Sietse Ringers's avatar
Sietse Ringers committed
506

507
508
// SessionRequest returns an IRMA session object.
func (jwt *SignatureRequestorJwt) SessionRequest() SessionRequest { return jwt.Request.Request }
Sietse Ringers's avatar
Sietse Ringers committed
509

510
511
// SessionRequest returns an IRMA session object.
func (jwt *IdentityProviderJwt) SessionRequest() SessionRequest { return jwt.Request.Request }
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547

func (jwt *ServiceProviderJwt) Valid() error {
	if jwt.Type != "verification_request" {
		return errors.New("Verification jwt has invalid subject")
	}
	if time.Time(jwt.IssuedAt).After(time.Now()) {
		return errors.New("Verification jwt not yet valid")
	}
	return nil
}

func (jwt *SignatureRequestorJwt) Valid() error {
	if jwt.Type != "signature_request" {
		return errors.New("Signature jwt has invalid subject")
	}
	if time.Time(jwt.IssuedAt).After(time.Now()) {
		return errors.New("Signature jwt not yet valid")
	}
	return nil
}

func (jwt *IdentityProviderJwt) Valid() error {
	if jwt.Type != "issue_request" {
		return errors.New("Issuance jwt has invalid subject")
	}
	if time.Time(jwt.IssuedAt).After(time.Now()) {
		return errors.New("Issuance jwt not yet valid")
	}
	return nil
}

func (jwt *ServiceProviderJwt) Action() Action { return ActionDisclosing }

func (jwt *SignatureRequestorJwt) Action() Action { return ActionSigning }

func (jwt *IdentityProviderJwt) Action() Action { return ActionIssuing }