File: shared.go

package info (click to toggle)
golang-gopkg-square-go-jose.v2 2.5.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, experimental, sid
  • size: 1,004 kB
  • sloc: makefile: 4
file content (520 lines) | stat: -rw-r--r-- 15,562 bytes parent folder | download | duplicates (2)
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
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
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
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
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
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
/*-
 * Copyright 2014 Square Inc.
 *
 * 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 jose

import (
	"crypto/elliptic"
	"crypto/x509"
	"encoding/base64"
	"errors"
	"fmt"

	"gopkg.in/square/go-jose.v2/json"
)

// KeyAlgorithm represents a key management algorithm.
type KeyAlgorithm string

// SignatureAlgorithm represents a signature (or MAC) algorithm.
type SignatureAlgorithm string

// ContentEncryption represents a content encryption algorithm.
type ContentEncryption string

// CompressionAlgorithm represents an algorithm used for plaintext compression.
type CompressionAlgorithm string

// ContentType represents type of the contained data.
type ContentType string

var (
	// ErrCryptoFailure represents an error in cryptographic primitive. This
	// occurs when, for example, a message had an invalid authentication tag or
	// could not be decrypted.
	ErrCryptoFailure = errors.New("square/go-jose: error in cryptographic primitive")

	// ErrUnsupportedAlgorithm indicates that a selected algorithm is not
	// supported. This occurs when trying to instantiate an encrypter for an
	// algorithm that is not yet implemented.
	ErrUnsupportedAlgorithm = errors.New("square/go-jose: unknown/unsupported algorithm")

	// ErrUnsupportedKeyType indicates that the given key type/format is not
	// supported. This occurs when trying to instantiate an encrypter and passing
	// it a key of an unrecognized type or with unsupported parameters, such as
	// an RSA private key with more than two primes.
	ErrUnsupportedKeyType = errors.New("square/go-jose: unsupported key type/format")

	// ErrInvalidKeySize indicates that the given key is not the correct size
	// for the selected algorithm. This can occur, for example, when trying to
	// encrypt with AES-256 but passing only a 128-bit key as input.
	ErrInvalidKeySize = errors.New("square/go-jose: invalid key size for algorithm")

	// ErrNotSupported serialization of object is not supported. This occurs when
	// trying to compact-serialize an object which can't be represented in
	// compact form.
	ErrNotSupported = errors.New("square/go-jose: compact serialization not supported for object")

	// ErrUnprotectedNonce indicates that while parsing a JWS or JWE object, a
	// nonce header parameter was included in an unprotected header object.
	ErrUnprotectedNonce = errors.New("square/go-jose: Nonce parameter included in unprotected header")
)

// Key management algorithms
const (
	ED25519            = KeyAlgorithm("ED25519")
	RSA1_5             = KeyAlgorithm("RSA1_5")             // RSA-PKCS1v1.5
	RSA_OAEP           = KeyAlgorithm("RSA-OAEP")           // RSA-OAEP-SHA1
	RSA_OAEP_256       = KeyAlgorithm("RSA-OAEP-256")       // RSA-OAEP-SHA256
	A128KW             = KeyAlgorithm("A128KW")             // AES key wrap (128)
	A192KW             = KeyAlgorithm("A192KW")             // AES key wrap (192)
	A256KW             = KeyAlgorithm("A256KW")             // AES key wrap (256)
	DIRECT             = KeyAlgorithm("dir")                // Direct encryption
	ECDH_ES            = KeyAlgorithm("ECDH-ES")            // ECDH-ES
	ECDH_ES_A128KW     = KeyAlgorithm("ECDH-ES+A128KW")     // ECDH-ES + AES key wrap (128)
	ECDH_ES_A192KW     = KeyAlgorithm("ECDH-ES+A192KW")     // ECDH-ES + AES key wrap (192)
	ECDH_ES_A256KW     = KeyAlgorithm("ECDH-ES+A256KW")     // ECDH-ES + AES key wrap (256)
	A128GCMKW          = KeyAlgorithm("A128GCMKW")          // AES-GCM key wrap (128)
	A192GCMKW          = KeyAlgorithm("A192GCMKW")          // AES-GCM key wrap (192)
	A256GCMKW          = KeyAlgorithm("A256GCMKW")          // AES-GCM key wrap (256)
	PBES2_HS256_A128KW = KeyAlgorithm("PBES2-HS256+A128KW") // PBES2 + HMAC-SHA256 + AES key wrap (128)
	PBES2_HS384_A192KW = KeyAlgorithm("PBES2-HS384+A192KW") // PBES2 + HMAC-SHA384 + AES key wrap (192)
	PBES2_HS512_A256KW = KeyAlgorithm("PBES2-HS512+A256KW") // PBES2 + HMAC-SHA512 + AES key wrap (256)
)

// Signature algorithms
const (
	EdDSA = SignatureAlgorithm("EdDSA")
	HS256 = SignatureAlgorithm("HS256") // HMAC using SHA-256
	HS384 = SignatureAlgorithm("HS384") // HMAC using SHA-384
	HS512 = SignatureAlgorithm("HS512") // HMAC using SHA-512
	RS256 = SignatureAlgorithm("RS256") // RSASSA-PKCS-v1.5 using SHA-256
	RS384 = SignatureAlgorithm("RS384") // RSASSA-PKCS-v1.5 using SHA-384
	RS512 = SignatureAlgorithm("RS512") // RSASSA-PKCS-v1.5 using SHA-512
	ES256 = SignatureAlgorithm("ES256") // ECDSA using P-256 and SHA-256
	ES384 = SignatureAlgorithm("ES384") // ECDSA using P-384 and SHA-384
	ES512 = SignatureAlgorithm("ES512") // ECDSA using P-521 and SHA-512
	PS256 = SignatureAlgorithm("PS256") // RSASSA-PSS using SHA256 and MGF1-SHA256
	PS384 = SignatureAlgorithm("PS384") // RSASSA-PSS using SHA384 and MGF1-SHA384
	PS512 = SignatureAlgorithm("PS512") // RSASSA-PSS using SHA512 and MGF1-SHA512
)

// Content encryption algorithms
const (
	A128CBC_HS256 = ContentEncryption("A128CBC-HS256") // AES-CBC + HMAC-SHA256 (128)
	A192CBC_HS384 = ContentEncryption("A192CBC-HS384") // AES-CBC + HMAC-SHA384 (192)
	A256CBC_HS512 = ContentEncryption("A256CBC-HS512") // AES-CBC + HMAC-SHA512 (256)
	A128GCM       = ContentEncryption("A128GCM")       // AES-GCM (128)
	A192GCM       = ContentEncryption("A192GCM")       // AES-GCM (192)
	A256GCM       = ContentEncryption("A256GCM")       // AES-GCM (256)
)

// Compression algorithms
const (
	NONE    = CompressionAlgorithm("")    // No compression
	DEFLATE = CompressionAlgorithm("DEF") // DEFLATE (RFC 1951)
)

// A key in the protected header of a JWS object. Use of the Header...
// constants is preferred to enhance type safety.
type HeaderKey string

const (
	HeaderType        HeaderKey = "typ" // string
	HeaderContentType           = "cty" // string

	// These are set by go-jose and shouldn't need to be set by consumers of the
	// library.
	headerAlgorithm   = "alg"  // string
	headerEncryption  = "enc"  // ContentEncryption
	headerCompression = "zip"  // CompressionAlgorithm
	headerCritical    = "crit" // []string

	headerAPU = "apu" // *byteBuffer
	headerAPV = "apv" // *byteBuffer
	headerEPK = "epk" // *JSONWebKey
	headerIV  = "iv"  // *byteBuffer
	headerTag = "tag" // *byteBuffer
	headerX5c = "x5c" // []*x509.Certificate

	headerJWK   = "jwk"   // *JSONWebKey
	headerKeyID = "kid"   // string
	headerNonce = "nonce" // string
	headerB64   = "b64"   // bool

	headerP2C = "p2c" // *byteBuffer (int)
	headerP2S = "p2s" // *byteBuffer ([]byte)

)

// supportedCritical is the set of supported extensions that are understood and processed.
var supportedCritical = map[string]bool{
	headerB64: true,
}

// rawHeader represents the JOSE header for JWE/JWS objects (used for parsing).
//
// The decoding of the constituent items is deferred because we want to marshal
// some members into particular structs rather than generic maps, but at the
// same time we need to receive any extra fields unhandled by this library to
// pass through to consuming code in case it wants to examine them.
type rawHeader map[HeaderKey]*json.RawMessage

// Header represents the read-only JOSE header for JWE/JWS objects.
type Header struct {
	KeyID      string
	JSONWebKey *JSONWebKey
	Algorithm  string
	Nonce      string

	// Unverified certificate chain parsed from x5c header.
	certificates []*x509.Certificate

	// Any headers not recognised above get unmarshaled
	// from JSON in a generic manner and placed in this map.
	ExtraHeaders map[HeaderKey]interface{}
}

// Certificates verifies & returns the certificate chain present
// in the x5c header field of a message, if one was present. Returns
// an error if there was no x5c header present or the chain could
// not be validated with the given verify options.
func (h Header) Certificates(opts x509.VerifyOptions) ([][]*x509.Certificate, error) {
	if len(h.certificates) == 0 {
		return nil, errors.New("square/go-jose: no x5c header present in message")
	}

	leaf := h.certificates[0]
	if opts.Intermediates == nil {
		opts.Intermediates = x509.NewCertPool()
		for _, intermediate := range h.certificates[1:] {
			opts.Intermediates.AddCert(intermediate)
		}
	}

	return leaf.Verify(opts)
}

func (parsed rawHeader) set(k HeaderKey, v interface{}) error {
	b, err := json.Marshal(v)
	if err != nil {
		return err
	}

	parsed[k] = makeRawMessage(b)
	return nil
}

// getString gets a string from the raw JSON, defaulting to "".
func (parsed rawHeader) getString(k HeaderKey) string {
	v, ok := parsed[k]
	if !ok || v == nil {
		return ""
	}
	var s string
	err := json.Unmarshal(*v, &s)
	if err != nil {
		return ""
	}
	return s
}

// getByteBuffer gets a byte buffer from the raw JSON. Returns (nil, nil) if
// not specified.
func (parsed rawHeader) getByteBuffer(k HeaderKey) (*byteBuffer, error) {
	v := parsed[k]
	if v == nil {
		return nil, nil
	}
	var bb *byteBuffer
	err := json.Unmarshal(*v, &bb)
	if err != nil {
		return nil, err
	}
	return bb, nil
}

// getAlgorithm extracts parsed "alg" from the raw JSON as a KeyAlgorithm.
func (parsed rawHeader) getAlgorithm() KeyAlgorithm {
	return KeyAlgorithm(parsed.getString(headerAlgorithm))
}

// getSignatureAlgorithm extracts parsed "alg" from the raw JSON as a SignatureAlgorithm.
func (parsed rawHeader) getSignatureAlgorithm() SignatureAlgorithm {
	return SignatureAlgorithm(parsed.getString(headerAlgorithm))
}

// getEncryption extracts parsed "enc" from the raw JSON.
func (parsed rawHeader) getEncryption() ContentEncryption {
	return ContentEncryption(parsed.getString(headerEncryption))
}

// getCompression extracts parsed "zip" from the raw JSON.
func (parsed rawHeader) getCompression() CompressionAlgorithm {
	return CompressionAlgorithm(parsed.getString(headerCompression))
}

func (parsed rawHeader) getNonce() string {
	return parsed.getString(headerNonce)
}

// getEPK extracts parsed "epk" from the raw JSON.
func (parsed rawHeader) getEPK() (*JSONWebKey, error) {
	v := parsed[headerEPK]
	if v == nil {
		return nil, nil
	}
	var epk *JSONWebKey
	err := json.Unmarshal(*v, &epk)
	if err != nil {
		return nil, err
	}
	return epk, nil
}

// getAPU extracts parsed "apu" from the raw JSON.
func (parsed rawHeader) getAPU() (*byteBuffer, error) {
	return parsed.getByteBuffer(headerAPU)
}

// getAPV extracts parsed "apv" from the raw JSON.
func (parsed rawHeader) getAPV() (*byteBuffer, error) {
	return parsed.getByteBuffer(headerAPV)
}

// getIV extracts parsed "iv" frpom the raw JSON.
func (parsed rawHeader) getIV() (*byteBuffer, error) {
	return parsed.getByteBuffer(headerIV)
}

// getTag extracts parsed "tag" frpom the raw JSON.
func (parsed rawHeader) getTag() (*byteBuffer, error) {
	return parsed.getByteBuffer(headerTag)
}

// getJWK extracts parsed "jwk" from the raw JSON.
func (parsed rawHeader) getJWK() (*JSONWebKey, error) {
	v := parsed[headerJWK]
	if v == nil {
		return nil, nil
	}
	var jwk *JSONWebKey
	err := json.Unmarshal(*v, &jwk)
	if err != nil {
		return nil, err
	}
	return jwk, nil
}

// getCritical extracts parsed "crit" from the raw JSON. If omitted, it
// returns an empty slice.
func (parsed rawHeader) getCritical() ([]string, error) {
	v := parsed[headerCritical]
	if v == nil {
		return nil, nil
	}

	var q []string
	err := json.Unmarshal(*v, &q)
	if err != nil {
		return nil, err
	}
	return q, nil
}

// getS2C extracts parsed "p2c" from the raw JSON.
func (parsed rawHeader) getP2C() (int, error) {
	v := parsed[headerP2C]
	if v == nil {
		return 0, nil
	}

	var p2c int
	err := json.Unmarshal(*v, &p2c)
	if err != nil {
		return 0, err
	}
	return p2c, nil
}

// getS2S extracts parsed "p2s" from the raw JSON.
func (parsed rawHeader) getP2S() (*byteBuffer, error) {
	return parsed.getByteBuffer(headerP2S)
}

// getB64 extracts parsed "b64" from the raw JSON, defaulting to true.
func (parsed rawHeader) getB64() (bool, error) {
	v := parsed[headerB64]
	if v == nil {
		return true, nil
	}

	var b64 bool
	err := json.Unmarshal(*v, &b64)
	if err != nil {
		return true, err
	}
	return b64, nil
}

// sanitized produces a cleaned-up header object from the raw JSON.
func (parsed rawHeader) sanitized() (h Header, err error) {
	for k, v := range parsed {
		if v == nil {
			continue
		}
		switch k {
		case headerJWK:
			var jwk *JSONWebKey
			err = json.Unmarshal(*v, &jwk)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal JWK: %v: %#v", err, string(*v))
				return
			}
			h.JSONWebKey = jwk
		case headerKeyID:
			var s string
			err = json.Unmarshal(*v, &s)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal key ID: %v: %#v", err, string(*v))
				return
			}
			h.KeyID = s
		case headerAlgorithm:
			var s string
			err = json.Unmarshal(*v, &s)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal algorithm: %v: %#v", err, string(*v))
				return
			}
			h.Algorithm = s
		case headerNonce:
			var s string
			err = json.Unmarshal(*v, &s)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal nonce: %v: %#v", err, string(*v))
				return
			}
			h.Nonce = s
		case headerX5c:
			c := []string{}
			err = json.Unmarshal(*v, &c)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
				return
			}
			h.certificates, err = parseCertificateChain(c)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
				return
			}
		default:
			if h.ExtraHeaders == nil {
				h.ExtraHeaders = map[HeaderKey]interface{}{}
			}
			var v2 interface{}
			err = json.Unmarshal(*v, &v2)
			if err != nil {
				err = fmt.Errorf("failed to unmarshal value: %v: %#v", err, string(*v))
				return
			}
			h.ExtraHeaders[k] = v2
		}
	}
	return
}

func parseCertificateChain(chain []string) ([]*x509.Certificate, error) {
	out := make([]*x509.Certificate, len(chain))
	for i, cert := range chain {
		raw, err := base64.StdEncoding.DecodeString(cert)
		if err != nil {
			return nil, err
		}
		out[i], err = x509.ParseCertificate(raw)
		if err != nil {
			return nil, err
		}
	}
	return out, nil
}

func (dst rawHeader) isSet(k HeaderKey) bool {
	dvr := dst[k]
	if dvr == nil {
		return false
	}

	var dv interface{}
	err := json.Unmarshal(*dvr, &dv)
	if err != nil {
		return true
	}

	if dvStr, ok := dv.(string); ok {
		return dvStr != ""
	}

	return true
}

// Merge headers from src into dst, giving precedence to headers from l.
func (dst rawHeader) merge(src *rawHeader) {
	if src == nil {
		return
	}

	for k, v := range *src {
		if dst.isSet(k) {
			continue
		}

		dst[k] = v
	}
}

// Get JOSE name of curve
func curveName(crv elliptic.Curve) (string, error) {
	switch crv {
	case elliptic.P256():
		return "P-256", nil
	case elliptic.P384():
		return "P-384", nil
	case elliptic.P521():
		return "P-521", nil
	default:
		return "", fmt.Errorf("square/go-jose: unsupported/unknown elliptic curve")
	}
}

// Get size of curve in bytes
func curveSize(crv elliptic.Curve) int {
	bits := crv.Params().BitSize

	div := bits / 8
	mod := bits % 8

	if mod == 0 {
		return div
	}

	return div + 1
}

func makeRawMessage(b []byte) *json.RawMessage {
	rm := json.RawMessage(b)
	return &rm
}