cms_env.c@ 91772

Last change on this file since 91772 was 91772, checked in by vboxsync, 3 years ago
openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126
File size: 23.6 KB

Line
1	/*
2	* Copyright 2008-2019 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
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
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
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
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
90	int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
91	{
92	return ri->type;
93	}
94
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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	ec->key = ukey;
741	ec->keylen = ukeylen;
742
743	r = 1;
744
745	err:
746
747	if (!r)
748	OPENSSL_free(ukey);
749	OPENSSL_cleanse(&actx, sizeof(actx));
750
751	return r;
752
753	}
754
755	int CMS_RecipientInfo_decrypt(CMS_ContentInfo cms, CMS_RecipientInfo ri)
756	{
757	switch (ri->type) {
758	case CMS_RECIPINFO_TRANS:
759	return cms_RecipientInfo_ktri_decrypt(cms, ri);
760
761	case CMS_RECIPINFO_KEK:
762	return cms_RecipientInfo_kekri_decrypt(cms, ri);
763
764	case CMS_RECIPINFO_PASS:
765	return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
766
767	default:
768	CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
769	CMS_R_UNSUPPORTED_RECIPIENTINFO_TYPE);
770	return 0;
771	}
772	}
773
774	int CMS_RecipientInfo_encrypt(CMS_ContentInfo cms, CMS_RecipientInfo ri)
775	{
776	switch (ri->type) {
777	case CMS_RECIPINFO_TRANS:
778	return cms_RecipientInfo_ktri_encrypt(cms, ri);
779
780	case CMS_RECIPINFO_AGREE:
781	return cms_RecipientInfo_kari_encrypt(cms, ri);
782
783	case CMS_RECIPINFO_KEK:
784	return cms_RecipientInfo_kekri_encrypt(cms, ri);
785
786	case CMS_RECIPINFO_PASS:
787	return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
788
789	default:
790	CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
791	CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
792	return 0;
793	}
794	}
795
796	/* Check structures and fixup version numbers (if necessary) */
797
798	static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
799	{
800	CMS_OriginatorInfo *org = env->originatorInfo;
801	int i;
802	if (org == NULL)
803	return;
804	for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
805	CMS_CertificateChoices *cch;
806	cch = sk_CMS_CertificateChoices_value(org->certificates, i);
807	if (cch->type == CMS_CERTCHOICE_OTHER) {
808	env->version = 4;
809	return;
810	} else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
811	if (env->version < 3)
812	env->version = 3;
813	}
814	}
815
816	for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
817	CMS_RevocationInfoChoice *rch;
818	rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
819	if (rch->type == CMS_REVCHOICE_OTHER) {
820	env->version = 4;
821	return;
822	}
823	}
824	}
825
826	static void cms_env_set_version(CMS_EnvelopedData *env)
827	{
828	int i;
829	CMS_RecipientInfo *ri;
830
831	/*
832	* Can't set version higher than 4 so if 4 or more already nothing to do.
833	*/
834	if (env->version >= 4)
835	return;
836
837	cms_env_set_originfo_version(env);
838
839	if (env->version >= 3)
840	return;
841
842	for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
843	ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
844	if (ri->type == CMS_RECIPINFO_PASS \|\| ri->type == CMS_RECIPINFO_OTHER) {
845	env->version = 3;
846	return;
847	} else if (ri->type != CMS_RECIPINFO_TRANS
848	\|\| ri->d.ktri->version != 0) {
849	env->version = 2;
850	}
851	}
852	if (env->originatorInfo \|\| env->unprotectedAttrs)
853	env->version = 2;
854	if (env->version == 2)
855	return;
856	env->version = 0;
857	}
858
859	BIO cms_EnvelopedData_init_bio(CMS_ContentInfo cms)
860	{
861	CMS_EncryptedContentInfo *ec;
862	STACK_OF(CMS_RecipientInfo) *rinfos;
863	CMS_RecipientInfo *ri;
864	int i, ok = 0;
865	BIO *ret;
866
867	/* Get BIO first to set up key */
868
869	ec = cms->d.envelopedData->encryptedContentInfo;
870	ret = cms_EncryptedContent_init_bio(ec);
871
872	/* If error or no cipher end of processing */
873
874	if (!ret \|\| !ec->cipher)
875	return ret;
876
877	/* Now encrypt content key according to each RecipientInfo type */
878
879	rinfos = cms->d.envelopedData->recipientInfos;
880
881	for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
882	ri = sk_CMS_RecipientInfo_value(rinfos, i);
883	if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
884	CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
885	CMS_R_ERROR_SETTING_RECIPIENTINFO);
886	goto err;
887	}
888	}
889	cms_env_set_version(cms->d.envelopedData);
890
891	ok = 1;
892
893	err:
894	ec->cipher = NULL;
895	OPENSSL_clear_free(ec->key, ec->keylen);
896	ec->key = NULL;
897	ec->keylen = 0;
898	if (ok)
899	return ret;
900	BIO_free(ret);
901	return NULL;
902
903	}
904
905	/*
906	* Get RecipientInfo type (if any) supported by a key (public or private). To
907	* retain compatibility with previous behaviour if the ctrl value isn't
908	* supported we assume key transport.
909	*/
910	int cms_pkey_get_ri_type(EVP_PKEY *pk)
911	{
912	if (pk->ameth && pk->ameth->pkey_ctrl) {
913	int i, r;
914	i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
915	if (i > 0)
916	return r;
917	}
918	return CMS_RECIPINFO_TRANS;
919	}

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source: vbox/trunk/src/libs/openssl-1.1.1l/crypto/cms/cms_env.c@ 91772

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