1 /*
2 * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include "internal/cryptlib.h"
11 #include <openssl/asn1t.h>
12 #include <openssl/pem.h>
13 #include <openssl/x509v3.h>
14 #include <openssl/err.h>
15 #include <openssl/cms.h>
16 #include <openssl/aes.h>
17 #include "cms_local.h"
18 #include "crypto/asn1.h"
19 #include "crypto/evp.h"
20
21 /* CMS EnvelopedData Utilities */
22
cms_get0_enveloped(CMS_ContentInfo * cms)23 CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
24 {
25 if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
26 CMSerr(CMS_F_CMS_GET0_ENVELOPED,
27 CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
28 return NULL;
29 }
30 return cms->d.envelopedData;
31 }
32
cms_enveloped_data_init(CMS_ContentInfo * cms)33 static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
34 {
35 if (cms->d.other == NULL) {
36 cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
37 if (!cms->d.envelopedData) {
38 CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, ERR_R_MALLOC_FAILURE);
39 return NULL;
40 }
41 cms->d.envelopedData->version = 0;
42 cms->d.envelopedData->encryptedContentInfo->contentType =
43 OBJ_nid2obj(NID_pkcs7_data);
44 ASN1_OBJECT_free(cms->contentType);
45 cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
46 return cms->d.envelopedData;
47 }
48 return cms_get0_enveloped(cms);
49 }
50
cms_env_asn1_ctrl(CMS_RecipientInfo * ri,int cmd)51 int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
52 {
53 EVP_PKEY *pkey;
54 int i;
55 if (ri->type == CMS_RECIPINFO_TRANS)
56 pkey = ri->d.ktri->pkey;
57 else if (ri->type == CMS_RECIPINFO_AGREE) {
58 EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
59 if (!pctx)
60 return 0;
61 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
62 if (!pkey)
63 return 0;
64 } else
65 return 0;
66 if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
67 return 1;
68 i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
69 if (i == -2) {
70 CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
71 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
72 return 0;
73 }
74 if (i <= 0) {
75 CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
76 return 0;
77 }
78 return 1;
79 }
80
STACK_OF(CMS_RecipientInfo)81 STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
82 {
83 CMS_EnvelopedData *env;
84 env = cms_get0_enveloped(cms);
85 if (!env)
86 return NULL;
87 return env->recipientInfos;
88 }
89
CMS_RecipientInfo_type(CMS_RecipientInfo * ri)90 int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
91 {
92 return ri->type;
93 }
94
CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo * ri)95 EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
96 {
97 if (ri->type == CMS_RECIPINFO_TRANS)
98 return ri->d.ktri->pctx;
99 else if (ri->type == CMS_RECIPINFO_AGREE)
100 return ri->d.kari->pctx;
101 return NULL;
102 }
103
CMS_EnvelopedData_create(const EVP_CIPHER * cipher)104 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
105 {
106 CMS_ContentInfo *cms;
107 CMS_EnvelopedData *env;
108 cms = CMS_ContentInfo_new();
109 if (cms == NULL)
110 goto merr;
111 env = cms_enveloped_data_init(cms);
112 if (env == NULL)
113 goto merr;
114 if (!cms_EncryptedContent_init(env->encryptedContentInfo,
115 cipher, NULL, 0))
116 goto merr;
117 return cms;
118 merr:
119 CMS_ContentInfo_free(cms);
120 CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
121 return NULL;
122 }
123
124 /* Key Transport Recipient Info (KTRI) routines */
125
126 /* Initialise a ktri based on passed certificate and key */
127
cms_RecipientInfo_ktri_init(CMS_RecipientInfo * ri,X509 * recip,EVP_PKEY * pk,unsigned int flags)128 static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
129 EVP_PKEY *pk, unsigned int flags)
130 {
131 CMS_KeyTransRecipientInfo *ktri;
132 int idtype;
133
134 ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
135 if (!ri->d.ktri)
136 return 0;
137 ri->type = CMS_RECIPINFO_TRANS;
138
139 ktri = ri->d.ktri;
140
141 if (flags & CMS_USE_KEYID) {
142 ktri->version = 2;
143 idtype = CMS_RECIPINFO_KEYIDENTIFIER;
144 } else {
145 ktri->version = 0;
146 idtype = CMS_RECIPINFO_ISSUER_SERIAL;
147 }
148
149 /*
150 * Not a typo: RecipientIdentifier and SignerIdentifier are the same
151 * structure.
152 */
153
154 if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
155 return 0;
156
157 X509_up_ref(recip);
158 EVP_PKEY_up_ref(pk);
159
160 ktri->pkey = pk;
161 ktri->recip = recip;
162
163 if (flags & CMS_KEY_PARAM) {
164 ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
165 if (ktri->pctx == NULL)
166 return 0;
167 if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
168 return 0;
169 } else if (!cms_env_asn1_ctrl(ri, 0))
170 return 0;
171 return 1;
172 }
173
174 /*
175 * Add a recipient certificate using appropriate type of RecipientInfo
176 */
177
CMS_add1_recipient_cert(CMS_ContentInfo * cms,X509 * recip,unsigned int flags)178 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
179 X509 *recip, unsigned int flags)
180 {
181 CMS_RecipientInfo *ri = NULL;
182 CMS_EnvelopedData *env;
183 EVP_PKEY *pk = NULL;
184 env = cms_get0_enveloped(cms);
185 if (!env)
186 goto err;
187
188 /* Initialize recipient info */
189 ri = M_ASN1_new_of(CMS_RecipientInfo);
190 if (!ri)
191 goto merr;
192
193 pk = X509_get0_pubkey(recip);
194 if (!pk) {
195 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, CMS_R_ERROR_GETTING_PUBLIC_KEY);
196 goto err;
197 }
198
199 switch (cms_pkey_get_ri_type(pk)) {
200
201 case CMS_RECIPINFO_TRANS:
202 if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
203 goto err;
204 break;
205
206 case CMS_RECIPINFO_AGREE:
207 if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
208 goto err;
209 break;
210
211 default:
212 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
213 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
214 goto err;
215
216 }
217
218 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
219 goto merr;
220
221 return ri;
222
223 merr:
224 CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
225 err:
226 M_ASN1_free_of(ri, CMS_RecipientInfo);
227 return NULL;
228
229 }
230
CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo * ri,EVP_PKEY ** pk,X509 ** recip,X509_ALGOR ** palg)231 int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
232 EVP_PKEY **pk, X509 **recip,
233 X509_ALGOR **palg)
234 {
235 CMS_KeyTransRecipientInfo *ktri;
236 if (ri->type != CMS_RECIPINFO_TRANS) {
237 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
238 CMS_R_NOT_KEY_TRANSPORT);
239 return 0;
240 }
241
242 ktri = ri->d.ktri;
243
244 if (pk)
245 *pk = ktri->pkey;
246 if (recip)
247 *recip = ktri->recip;
248 if (palg)
249 *palg = ktri->keyEncryptionAlgorithm;
250 return 1;
251 }
252
CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo * ri,ASN1_OCTET_STRING ** keyid,X509_NAME ** issuer,ASN1_INTEGER ** sno)253 int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
254 ASN1_OCTET_STRING **keyid,
255 X509_NAME **issuer,
256 ASN1_INTEGER **sno)
257 {
258 CMS_KeyTransRecipientInfo *ktri;
259 if (ri->type != CMS_RECIPINFO_TRANS) {
260 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
261 CMS_R_NOT_KEY_TRANSPORT);
262 return 0;
263 }
264 ktri = ri->d.ktri;
265
266 return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
267 }
268
CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo * ri,X509 * cert)269 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
270 {
271 if (ri->type != CMS_RECIPINFO_TRANS) {
272 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
273 CMS_R_NOT_KEY_TRANSPORT);
274 return -2;
275 }
276 return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
277 }
278
CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo * ri,EVP_PKEY * pkey)279 int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
280 {
281 if (ri->type != CMS_RECIPINFO_TRANS) {
282 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, CMS_R_NOT_KEY_TRANSPORT);
283 return 0;
284 }
285 EVP_PKEY_free(ri->d.ktri->pkey);
286 ri->d.ktri->pkey = pkey;
287 return 1;
288 }
289
290 /* Encrypt content key in key transport recipient info */
291
cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)292 static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
293 CMS_RecipientInfo *ri)
294 {
295 CMS_KeyTransRecipientInfo *ktri;
296 CMS_EncryptedContentInfo *ec;
297 EVP_PKEY_CTX *pctx;
298 unsigned char *ek = NULL;
299 size_t eklen;
300
301 int ret = 0;
302
303 if (ri->type != CMS_RECIPINFO_TRANS) {
304 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_NOT_KEY_TRANSPORT);
305 return 0;
306 }
307 ktri = ri->d.ktri;
308 ec = cms->d.envelopedData->encryptedContentInfo;
309
310 pctx = ktri->pctx;
311
312 if (pctx) {
313 if (!cms_env_asn1_ctrl(ri, 0))
314 goto err;
315 } else {
316 pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
317 if (pctx == NULL)
318 return 0;
319
320 if (EVP_PKEY_encrypt_init(pctx) <= 0)
321 goto err;
322 }
323
324 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
325 EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
326 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
327 goto err;
328 }
329
330 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
331 goto err;
332
333 ek = OPENSSL_malloc(eklen);
334
335 if (ek == NULL) {
336 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
337 goto err;
338 }
339
340 if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
341 goto err;
342
343 ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
344 ek = NULL;
345
346 ret = 1;
347
348 err:
349 EVP_PKEY_CTX_free(pctx);
350 ktri->pctx = NULL;
351 OPENSSL_free(ek);
352 return ret;
353
354 }
355
356 /* Decrypt content key from KTRI */
357
cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)358 static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
359 CMS_RecipientInfo *ri)
360 {
361 CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
362 EVP_PKEY *pkey = ktri->pkey;
363 unsigned char *ek = NULL;
364 size_t eklen;
365 int ret = 0;
366 size_t fixlen = 0;
367 CMS_EncryptedContentInfo *ec;
368 ec = cms->d.envelopedData->encryptedContentInfo;
369
370 if (ktri->pkey == NULL) {
371 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_NO_PRIVATE_KEY);
372 return 0;
373 }
374
375 if (cms->d.envelopedData->encryptedContentInfo->havenocert
376 && !cms->d.envelopedData->encryptedContentInfo->debug) {
377 X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
378 const EVP_CIPHER *ciph = EVP_get_cipherbyobj(calg->algorithm);
379
380 if (ciph == NULL) {
381 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_UNKNOWN_CIPHER);
382 return 0;
383 }
384
385 fixlen = EVP_CIPHER_key_length(ciph);
386 }
387
388 ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
389 if (ktri->pctx == NULL)
390 return 0;
391
392 if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
393 goto err;
394
395 if (!cms_env_asn1_ctrl(ri, 1))
396 goto err;
397
398 if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
399 EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
400 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
401 goto err;
402 }
403
404 if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
405 ktri->encryptedKey->data,
406 ktri->encryptedKey->length) <= 0)
407 goto err;
408
409 ek = OPENSSL_malloc(eklen);
410
411 if (ek == NULL) {
412 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, ERR_R_MALLOC_FAILURE);
413 goto err;
414 }
415
416 if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
417 ktri->encryptedKey->data,
418 ktri->encryptedKey->length) <= 0
419 || eklen == 0
420 || (fixlen != 0 && eklen != fixlen)) {
421 CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
422 goto err;
423 }
424
425 ret = 1;
426
427 OPENSSL_clear_free(ec->key, ec->keylen);
428 ec->key = ek;
429 ec->keylen = eklen;
430
431 err:
432 EVP_PKEY_CTX_free(ktri->pctx);
433 ktri->pctx = NULL;
434 if (!ret)
435 OPENSSL_free(ek);
436
437 return ret;
438 }
439
440 /* Key Encrypted Key (KEK) RecipientInfo routines */
441
CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo * ri,const unsigned char * id,size_t idlen)442 int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
443 const unsigned char *id, size_t idlen)
444 {
445 ASN1_OCTET_STRING tmp_os;
446 CMS_KEKRecipientInfo *kekri;
447 if (ri->type != CMS_RECIPINFO_KEK) {
448 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
449 return -2;
450 }
451 kekri = ri->d.kekri;
452 tmp_os.type = V_ASN1_OCTET_STRING;
453 tmp_os.flags = 0;
454 tmp_os.data = (unsigned char *)id;
455 tmp_os.length = (int)idlen;
456 return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
457 }
458
459 /* For now hard code AES key wrap info */
460
aes_wrap_keylen(int nid)461 static size_t aes_wrap_keylen(int nid)
462 {
463 switch (nid) {
464 case NID_id_aes128_wrap:
465 return 16;
466
467 case NID_id_aes192_wrap:
468 return 24;
469
470 case NID_id_aes256_wrap:
471 return 32;
472
473 default:
474 return 0;
475 }
476 }
477
CMS_add0_recipient_key(CMS_ContentInfo * cms,int nid,unsigned char * key,size_t keylen,unsigned char * id,size_t idlen,ASN1_GENERALIZEDTIME * date,ASN1_OBJECT * otherTypeId,ASN1_TYPE * otherType)478 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
479 unsigned char *key, size_t keylen,
480 unsigned char *id, size_t idlen,
481 ASN1_GENERALIZEDTIME *date,
482 ASN1_OBJECT *otherTypeId,
483 ASN1_TYPE *otherType)
484 {
485 CMS_RecipientInfo *ri = NULL;
486 CMS_EnvelopedData *env;
487 CMS_KEKRecipientInfo *kekri;
488 env = cms_get0_enveloped(cms);
489 if (!env)
490 goto err;
491
492 if (nid == NID_undef) {
493 switch (keylen) {
494 case 16:
495 nid = NID_id_aes128_wrap;
496 break;
497
498 case 24:
499 nid = NID_id_aes192_wrap;
500 break;
501
502 case 32:
503 nid = NID_id_aes256_wrap;
504 break;
505
506 default:
507 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
508 goto err;
509 }
510
511 } else {
512
513 size_t exp_keylen = aes_wrap_keylen(nid);
514
515 if (!exp_keylen) {
516 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
517 CMS_R_UNSUPPORTED_KEK_ALGORITHM);
518 goto err;
519 }
520
521 if (keylen != exp_keylen) {
522 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
523 goto err;
524 }
525
526 }
527
528 /* Initialize recipient info */
529 ri = M_ASN1_new_of(CMS_RecipientInfo);
530 if (!ri)
531 goto merr;
532
533 ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
534 if (!ri->d.kekri)
535 goto merr;
536 ri->type = CMS_RECIPINFO_KEK;
537
538 kekri = ri->d.kekri;
539
540 if (otherTypeId) {
541 kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
542 if (kekri->kekid->other == NULL)
543 goto merr;
544 }
545
546 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
547 goto merr;
548
549 /* After this point no calls can fail */
550
551 kekri->version = 4;
552
553 kekri->key = key;
554 kekri->keylen = keylen;
555
556 ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
557
558 kekri->kekid->date = date;
559
560 if (kekri->kekid->other) {
561 kekri->kekid->other->keyAttrId = otherTypeId;
562 kekri->kekid->other->keyAttr = otherType;
563 }
564
565 X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
566 OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
567
568 return ri;
569
570 merr:
571 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
572 err:
573 M_ASN1_free_of(ri, CMS_RecipientInfo);
574 return NULL;
575
576 }
577
CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo * ri,X509_ALGOR ** palg,ASN1_OCTET_STRING ** pid,ASN1_GENERALIZEDTIME ** pdate,ASN1_OBJECT ** potherid,ASN1_TYPE ** pothertype)578 int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
579 X509_ALGOR **palg,
580 ASN1_OCTET_STRING **pid,
581 ASN1_GENERALIZEDTIME **pdate,
582 ASN1_OBJECT **potherid,
583 ASN1_TYPE **pothertype)
584 {
585 CMS_KEKIdentifier *rkid;
586 if (ri->type != CMS_RECIPINFO_KEK) {
587 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
588 return 0;
589 }
590 rkid = ri->d.kekri->kekid;
591 if (palg)
592 *palg = ri->d.kekri->keyEncryptionAlgorithm;
593 if (pid)
594 *pid = rkid->keyIdentifier;
595 if (pdate)
596 *pdate = rkid->date;
597 if (potherid) {
598 if (rkid->other)
599 *potherid = rkid->other->keyAttrId;
600 else
601 *potherid = NULL;
602 }
603 if (pothertype) {
604 if (rkid->other)
605 *pothertype = rkid->other->keyAttr;
606 else
607 *pothertype = NULL;
608 }
609 return 1;
610 }
611
CMS_RecipientInfo_set0_key(CMS_RecipientInfo * ri,unsigned char * key,size_t keylen)612 int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
613 unsigned char *key, size_t keylen)
614 {
615 CMS_KEKRecipientInfo *kekri;
616 if (ri->type != CMS_RECIPINFO_KEK) {
617 CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
618 return 0;
619 }
620
621 kekri = ri->d.kekri;
622 kekri->key = key;
623 kekri->keylen = keylen;
624 return 1;
625 }
626
627 /* Encrypt content key in KEK recipient info */
628
cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)629 static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
630 CMS_RecipientInfo *ri)
631 {
632 CMS_EncryptedContentInfo *ec;
633 CMS_KEKRecipientInfo *kekri;
634 AES_KEY actx;
635 unsigned char *wkey = NULL;
636 int wkeylen;
637 int r = 0;
638
639 ec = cms->d.envelopedData->encryptedContentInfo;
640
641 kekri = ri->d.kekri;
642
643 if (!kekri->key) {
644 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
645 return 0;
646 }
647
648 if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
649 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
650 CMS_R_ERROR_SETTING_KEY);
651 goto err;
652 }
653
654 wkey = OPENSSL_malloc(ec->keylen + 8);
655
656 if (wkey == NULL) {
657 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
658 goto err;
659 }
660
661 wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
662
663 if (wkeylen <= 0) {
664 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
665 goto err;
666 }
667
668 ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
669
670 r = 1;
671
672 err:
673
674 if (!r)
675 OPENSSL_free(wkey);
676 OPENSSL_cleanse(&actx, sizeof(actx));
677
678 return r;
679
680 }
681
682 /* Decrypt content key in KEK recipient info */
683
cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)684 static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
685 CMS_RecipientInfo *ri)
686 {
687 CMS_EncryptedContentInfo *ec;
688 CMS_KEKRecipientInfo *kekri;
689 AES_KEY actx;
690 unsigned char *ukey = NULL;
691 int ukeylen;
692 int r = 0, wrap_nid;
693
694 ec = cms->d.envelopedData->encryptedContentInfo;
695
696 kekri = ri->d.kekri;
697
698 if (!kekri->key) {
699 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
700 return 0;
701 }
702
703 wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
704 if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
705 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
706 CMS_R_INVALID_KEY_LENGTH);
707 return 0;
708 }
709
710 /* If encrypted key length is invalid don't bother */
711
712 if (kekri->encryptedKey->length < 16) {
713 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
714 CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
715 goto err;
716 }
717
718 if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
719 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
720 CMS_R_ERROR_SETTING_KEY);
721 goto err;
722 }
723
724 ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
725
726 if (ukey == NULL) {
727 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, ERR_R_MALLOC_FAILURE);
728 goto err;
729 }
730
731 ukeylen = AES_unwrap_key(&actx, NULL, ukey,
732 kekri->encryptedKey->data,
733 kekri->encryptedKey->length);
734
735 if (ukeylen <= 0) {
736 CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_UNWRAP_ERROR);
737 goto err;
738 }
739
740 OPENSSL_clear_free(ec->key, ec->keylen);
741 ec->key = ukey;
742 ec->keylen = ukeylen;
743
744 r = 1;
745
746 err:
747
748 if (!r)
749 OPENSSL_free(ukey);
750 OPENSSL_cleanse(&actx, sizeof(actx));
751
752 return r;
753
754 }
755
CMS_RecipientInfo_decrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)756 int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
757 {
758 switch (ri->type) {
759 case CMS_RECIPINFO_TRANS:
760 return cms_RecipientInfo_ktri_decrypt(cms, ri);
761
762 case CMS_RECIPINFO_KEK:
763 return cms_RecipientInfo_kekri_decrypt(cms, ri);
764
765 case CMS_RECIPINFO_PASS:
766 return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
767
768 default:
769 CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
770 CMS_R_UNSUPPORTED_RECIPIENTINFO_TYPE);
771 return 0;
772 }
773 }
774
CMS_RecipientInfo_encrypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri)775 int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
776 {
777 switch (ri->type) {
778 case CMS_RECIPINFO_TRANS:
779 return cms_RecipientInfo_ktri_encrypt(cms, ri);
780
781 case CMS_RECIPINFO_AGREE:
782 return cms_RecipientInfo_kari_encrypt(cms, ri);
783
784 case CMS_RECIPINFO_KEK:
785 return cms_RecipientInfo_kekri_encrypt(cms, ri);
786
787 case CMS_RECIPINFO_PASS:
788 return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
789
790 default:
791 CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
792 CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
793 return 0;
794 }
795 }
796
797 /* Check structures and fixup version numbers (if necessary) */
798
cms_env_set_originfo_version(CMS_EnvelopedData * env)799 static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
800 {
801 CMS_OriginatorInfo *org = env->originatorInfo;
802 int i;
803 if (org == NULL)
804 return;
805 for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
806 CMS_CertificateChoices *cch;
807 cch = sk_CMS_CertificateChoices_value(org->certificates, i);
808 if (cch->type == CMS_CERTCHOICE_OTHER) {
809 env->version = 4;
810 return;
811 } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
812 if (env->version < 3)
813 env->version = 3;
814 }
815 }
816
817 for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
818 CMS_RevocationInfoChoice *rch;
819 rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
820 if (rch->type == CMS_REVCHOICE_OTHER) {
821 env->version = 4;
822 return;
823 }
824 }
825 }
826
cms_env_set_version(CMS_EnvelopedData * env)827 static void cms_env_set_version(CMS_EnvelopedData *env)
828 {
829 int i;
830 CMS_RecipientInfo *ri;
831
832 /*
833 * Can't set version higher than 4 so if 4 or more already nothing to do.
834 */
835 if (env->version >= 4)
836 return;
837
838 cms_env_set_originfo_version(env);
839
840 if (env->version >= 3)
841 return;
842
843 for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
844 ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
845 if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
846 env->version = 3;
847 return;
848 } else if (ri->type != CMS_RECIPINFO_TRANS
849 || ri->d.ktri->version != 0) {
850 env->version = 2;
851 }
852 }
853 if (env->originatorInfo || env->unprotectedAttrs)
854 env->version = 2;
855 if (env->version == 2)
856 return;
857 env->version = 0;
858 }
859
cms_EnvelopedData_init_bio(CMS_ContentInfo * cms)860 BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
861 {
862 CMS_EncryptedContentInfo *ec;
863 STACK_OF(CMS_RecipientInfo) *rinfos;
864 CMS_RecipientInfo *ri;
865 int i, ok = 0;
866 BIO *ret;
867
868 /* Get BIO first to set up key */
869
870 ec = cms->d.envelopedData->encryptedContentInfo;
871 ret = cms_EncryptedContent_init_bio(ec);
872
873 /* If error or no cipher end of processing */
874
875 if (!ret || !ec->cipher)
876 return ret;
877
878 /* Now encrypt content key according to each RecipientInfo type */
879
880 rinfos = cms->d.envelopedData->recipientInfos;
881
882 for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
883 ri = sk_CMS_RecipientInfo_value(rinfos, i);
884 if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
885 CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
886 CMS_R_ERROR_SETTING_RECIPIENTINFO);
887 goto err;
888 }
889 }
890 cms_env_set_version(cms->d.envelopedData);
891
892 ok = 1;
893
894 err:
895 ec->cipher = NULL;
896 OPENSSL_clear_free(ec->key, ec->keylen);
897 ec->key = NULL;
898 ec->keylen = 0;
899 if (ok)
900 return ret;
901 BIO_free(ret);
902 return NULL;
903
904 }
905
906 /*
907 * Get RecipientInfo type (if any) supported by a key (public or private). To
908 * retain compatibility with previous behaviour if the ctrl value isn't
909 * supported we assume key transport.
910 */
cms_pkey_get_ri_type(EVP_PKEY * pk)911 int cms_pkey_get_ri_type(EVP_PKEY *pk)
912 {
913 if (pk->ameth && pk->ameth->pkey_ctrl) {
914 int i, r;
915 i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
916 if (i > 0)
917 return r;
918 }
919 return CMS_RECIPINFO_TRANS;
920 }
921