1 /* $OpenBSD: cms_smime.c,v 1.24 2019/10/04 18:03:56 tb Exp $ */
2 /*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 * project.
5 */
6 /* ====================================================================
7 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 */
54
55 #include "cryptlib.h"
56 #include <openssl/asn1t.h>
57 #include <openssl/x509.h>
58 #include <openssl/x509v3.h>
59 #include <openssl/err.h>
60 #include <openssl/cms.h>
61 #include "cms_lcl.h"
62 #include "asn1/asn1_locl.h"
63
64 static BIO *
cms_get_text_bio(BIO * out,unsigned int flags)65 cms_get_text_bio(BIO *out, unsigned int flags)
66 {
67 BIO *rbio;
68
69 if (out == NULL)
70 rbio = BIO_new(BIO_s_null());
71 else if (flags & CMS_TEXT) {
72 rbio = BIO_new(BIO_s_mem());
73 BIO_set_mem_eof_return(rbio, 0);
74 } else
75 rbio = out;
76
77 return rbio;
78 }
79
80 static int
cms_copy_content(BIO * out,BIO * in,unsigned int flags)81 cms_copy_content(BIO *out, BIO *in, unsigned int flags)
82 {
83 unsigned char buf[4096];
84 int r = 0, i;
85 BIO *tmpout;
86
87 tmpout = cms_get_text_bio(out, flags);
88
89 if (tmpout == NULL) {
90 CMSerror(ERR_R_MALLOC_FAILURE);
91 goto err;
92 }
93
94 /* Read all content through chain to process digest, decrypt etc */
95 for (;;) {
96 i = BIO_read(in, buf, sizeof(buf));
97 if (i <= 0) {
98 if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
99 if (!BIO_get_cipher_status(in))
100 goto err;
101 }
102 if (i < 0)
103 goto err;
104 break;
105 }
106
107 if (tmpout && (BIO_write(tmpout, buf, i) != i))
108 goto err;
109 }
110
111 if (flags & CMS_TEXT) {
112 if (!SMIME_text(tmpout, out)) {
113 CMSerror(CMS_R_SMIME_TEXT_ERROR);
114 goto err;
115 }
116 }
117
118 r = 1;
119
120 err:
121 if (tmpout != out)
122 BIO_free(tmpout);
123
124 return r;
125 }
126
127 static int
check_content(CMS_ContentInfo * cms)128 check_content(CMS_ContentInfo *cms)
129 {
130 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
131
132 if (!pos || !*pos) {
133 CMSerror(CMS_R_NO_CONTENT);
134 return 0;
135 }
136
137 return 1;
138 }
139
140 static void
do_free_upto(BIO * f,BIO * upto)141 do_free_upto(BIO *f, BIO *upto)
142 {
143 if (upto) {
144 BIO *tbio;
145 do {
146 tbio = BIO_pop(f);
147 BIO_free(f);
148 f = tbio;
149 }
150 while (f && f != upto);
151 } else
152 BIO_free_all(f);
153 }
154
155 int
CMS_data(CMS_ContentInfo * cms,BIO * out,unsigned int flags)156 CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
157 {
158 BIO *cont;
159 int r;
160
161 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) {
162 CMSerror(CMS_R_TYPE_NOT_DATA);
163 return 0;
164 }
165 cont = CMS_dataInit(cms, NULL);
166 if (!cont)
167 return 0;
168 r = cms_copy_content(out, cont, flags);
169 BIO_free_all(cont);
170
171 return r;
172 }
173
174 CMS_ContentInfo *
CMS_data_create(BIO * in,unsigned int flags)175 CMS_data_create(BIO *in, unsigned int flags)
176 {
177 CMS_ContentInfo *cms;
178
179 cms = cms_Data_create();
180 if (!cms)
181 return NULL;
182
183 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
184 return cms;
185
186 CMS_ContentInfo_free(cms);
187
188 return NULL;
189 }
190
191 int
CMS_digest_verify(CMS_ContentInfo * cms,BIO * dcont,BIO * out,unsigned int flags)192 CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)
193 {
194 BIO *cont;
195 int r;
196
197 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) {
198 CMSerror(CMS_R_TYPE_NOT_DIGESTED_DATA);
199 return 0;
200 }
201
202 if (!dcont && !check_content(cms))
203 return 0;
204
205 cont = CMS_dataInit(cms, dcont);
206 if (!cont)
207 return 0;
208 r = cms_copy_content(out, cont, flags);
209 if (r)
210 r = cms_DigestedData_do_final(cms, cont, 1);
211 do_free_upto(cont, dcont);
212
213 return r;
214 }
215
216 CMS_ContentInfo *
CMS_digest_create(BIO * in,const EVP_MD * md,unsigned int flags)217 CMS_digest_create(BIO *in, const EVP_MD *md, unsigned int flags)
218 {
219 CMS_ContentInfo *cms;
220
221 if (!md)
222 md = EVP_sha1();
223 cms = cms_DigestedData_create(md);
224 if (!cms)
225 return NULL;
226
227 if (!(flags & CMS_DETACHED))
228 CMS_set_detached(cms, 0);
229
230 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
231 return cms;
232
233 CMS_ContentInfo_free(cms);
234
235 return NULL;
236 }
237
238 int
CMS_EncryptedData_decrypt(CMS_ContentInfo * cms,const unsigned char * key,size_t keylen,BIO * dcont,BIO * out,unsigned int flags)239 CMS_EncryptedData_decrypt(CMS_ContentInfo *cms, const unsigned char *key,
240 size_t keylen, BIO *dcont, BIO *out, unsigned int flags)
241 {
242 BIO *cont;
243 int r;
244
245 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) {
246 CMSerror(CMS_R_TYPE_NOT_ENCRYPTED_DATA);
247 return 0;
248 }
249
250 if (!dcont && !check_content(cms))
251 return 0;
252
253 if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
254 return 0;
255 cont = CMS_dataInit(cms, dcont);
256 if (!cont)
257 return 0;
258 r = cms_copy_content(out, cont, flags);
259 do_free_upto(cont, dcont);
260
261 return r;
262 }
263
264 CMS_ContentInfo *
CMS_EncryptedData_encrypt(BIO * in,const EVP_CIPHER * cipher,const unsigned char * key,size_t keylen,unsigned int flags)265 CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
266 const unsigned char *key, size_t keylen, unsigned int flags)
267 {
268 CMS_ContentInfo *cms;
269
270 if (!cipher) {
271 CMSerror(CMS_R_NO_CIPHER);
272 return NULL;
273 }
274 cms = CMS_ContentInfo_new();
275 if (cms == NULL)
276 return NULL;
277 if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
278 return NULL;
279
280 if (!(flags & CMS_DETACHED))
281 CMS_set_detached(cms, 0);
282
283 if ((flags & (CMS_STREAM | CMS_PARTIAL)) ||
284 CMS_final(cms, in, NULL, flags))
285 return cms;
286
287 CMS_ContentInfo_free(cms);
288
289 return NULL;
290 }
291
292 static int
cms_signerinfo_verify_cert(CMS_SignerInfo * si,X509_STORE * store,STACK_OF (X509)* certs,STACK_OF (X509_CRL)* crls)293 cms_signerinfo_verify_cert(CMS_SignerInfo *si, X509_STORE *store,
294 STACK_OF(X509) *certs, STACK_OF(X509_CRL) *crls)
295 {
296 X509_STORE_CTX *ctx = X509_STORE_CTX_new();
297 X509 *signer;
298 int i, j, r = 0;
299
300 if (ctx == NULL) {
301 CMSerror(ERR_R_MALLOC_FAILURE);
302 goto err;
303 }
304 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
305 if (!X509_STORE_CTX_init(ctx, store, signer, certs)) {
306 CMSerror(CMS_R_STORE_INIT_ERROR);
307 goto err;
308 }
309 X509_STORE_CTX_set_default(ctx, "smime_sign");
310 if (crls)
311 X509_STORE_CTX_set0_crls(ctx, crls);
312
313 i = X509_verify_cert(ctx);
314 if (i <= 0) {
315 j = X509_STORE_CTX_get_error(ctx);
316 CMSerror(CMS_R_CERTIFICATE_VERIFY_ERROR);
317 ERR_asprintf_error_data("Verify error: %s",
318 X509_verify_cert_error_string(j));
319 goto err;
320 }
321 r = 1;
322
323 err:
324 X509_STORE_CTX_free(ctx);
325
326 return r;
327 }
328
329 int
CMS_verify(CMS_ContentInfo * cms,STACK_OF (X509)* certs,X509_STORE * store,BIO * dcont,BIO * out,unsigned int flags)330 CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs, X509_STORE *store,
331 BIO *dcont, BIO *out, unsigned int flags)
332 {
333 CMS_SignerInfo *si;
334 STACK_OF(CMS_SignerInfo) *sinfos;
335 STACK_OF(X509) *cms_certs = NULL;
336 STACK_OF(X509_CRL) *crls = NULL;
337 X509 *signer;
338 int i, scount = 0, ret = 0;
339 BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
340
341 if (!dcont && !check_content(cms))
342 return 0;
343 if (dcont && !(flags & CMS_BINARY)) {
344 const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
345 if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
346 flags |= CMS_ASCIICRLF;
347 }
348
349 /* Attempt to find all signer certificates */
350
351 sinfos = CMS_get0_SignerInfos(cms);
352 if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
353 CMSerror(CMS_R_NO_SIGNERS);
354 goto err;
355 }
356
357 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
358 si = sk_CMS_SignerInfo_value(sinfos, i);
359 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
360 if (signer)
361 scount++;
362 }
363
364 if (scount != sk_CMS_SignerInfo_num(sinfos))
365 scount += CMS_set1_signers_certs(cms, certs, flags);
366
367 if (scount != sk_CMS_SignerInfo_num(sinfos)) {
368 CMSerror(CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
369 goto err;
370 }
371
372 /* Attempt to verify all signers certs */
373
374 if (!(flags & CMS_NO_SIGNER_CERT_VERIFY)) {
375 cms_certs = CMS_get1_certs(cms);
376 if (!(flags & CMS_NOCRL))
377 crls = CMS_get1_crls(cms);
378 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
379 si = sk_CMS_SignerInfo_value(sinfos, i);
380 if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls))
381 goto err;
382 }
383 }
384
385 /* Attempt to verify all SignerInfo signed attribute signatures */
386
387 if (!(flags & CMS_NO_ATTR_VERIFY)) {
388 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
389 si = sk_CMS_SignerInfo_value(sinfos, i);
390 if (CMS_signed_get_attr_count(si) < 0)
391 continue;
392 if (CMS_SignerInfo_verify(si) <= 0)
393 goto err;
394 }
395 }
396
397 /*
398 * Performance optimization: if the content is a memory BIO then store
399 * its contents in a temporary read only memory BIO. This avoids
400 * potentially large numbers of slow copies of data which will occur when
401 * reading from a read write memory BIO when signatures are calculated.
402 */
403
404 if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
405 char *ptr;
406 long len;
407
408 len = BIO_get_mem_data(dcont, &ptr);
409 tmpin = BIO_new_mem_buf(ptr, len);
410 if (tmpin == NULL) {
411 CMSerror(ERR_R_MALLOC_FAILURE);
412 goto err2;
413 }
414 } else
415 tmpin = dcont;
416
417 /*
418 * If not binary mode and detached generate digests by *writing* through
419 * the BIO. That makes it possible to canonicalise the input.
420 */
421 if (!(flags & SMIME_BINARY) && dcont) {
422 /*
423 * Create output BIO so we can either handle text or to ensure
424 * included content doesn't override detached content.
425 */
426 tmpout = cms_get_text_bio(out, flags);
427 if (!tmpout) {
428 CMSerror(ERR_R_MALLOC_FAILURE);
429 goto err;
430 }
431 cmsbio = CMS_dataInit(cms, tmpout);
432 if (!cmsbio)
433 goto err;
434 /*
435 * Don't use SMIME_TEXT for verify: it adds headers and we want to
436 * remove them.
437 */
438 SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT);
439
440 if (flags & CMS_TEXT) {
441 if (!SMIME_text(tmpout, out)) {
442 CMSerror(CMS_R_SMIME_TEXT_ERROR);
443 goto err;
444 }
445 }
446 } else {
447 cmsbio = CMS_dataInit(cms, tmpin);
448 if (!cmsbio)
449 goto err;
450
451 if (!cms_copy_content(out, cmsbio, flags))
452 goto err;
453
454 }
455 if (!(flags & CMS_NO_CONTENT_VERIFY)) {
456 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
457 si = sk_CMS_SignerInfo_value(sinfos, i);
458 if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
459 CMSerror(CMS_R_CONTENT_VERIFY_ERROR);
460 goto err;
461 }
462 }
463 }
464
465 ret = 1;
466
467 err:
468 if (!(flags & SMIME_BINARY) && dcont) {
469 do_free_upto(cmsbio, tmpout);
470 if (tmpin != dcont)
471 BIO_free(tmpin);
472 } else {
473 if (dcont && (tmpin == dcont))
474 do_free_upto(cmsbio, dcont);
475 else
476 BIO_free_all(cmsbio);
477 }
478
479 if (out != tmpout)
480 BIO_free_all(tmpout);
481
482 err2:
483 sk_X509_pop_free(cms_certs, X509_free);
484 sk_X509_CRL_pop_free(crls, X509_CRL_free);
485
486 return ret;
487 }
488
489 int
CMS_verify_receipt(CMS_ContentInfo * rcms,CMS_ContentInfo * ocms,STACK_OF (X509)* certs,X509_STORE * store,unsigned int flags)490 CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
491 STACK_OF(X509) *certs, X509_STORE *store, unsigned int flags)
492 {
493 int r;
494
495 flags &= ~(CMS_DETACHED | CMS_TEXT);
496 r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
497 if (r <= 0)
498 return r;
499
500 return cms_Receipt_verify(rcms, ocms);
501 }
502
503 CMS_ContentInfo *
CMS_sign(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,unsigned int flags)504 CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data,
505 unsigned int flags)
506 {
507 CMS_ContentInfo *cms;
508 int i;
509
510 cms = CMS_ContentInfo_new();
511 if (cms == NULL || !CMS_SignedData_init(cms))
512 goto merr;
513 if (flags & CMS_ASCIICRLF &&
514 !CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF)))
515 goto err;
516
517 if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
518 CMSerror(CMS_R_ADD_SIGNER_ERROR);
519 goto err;
520 }
521
522 for (i = 0; i < sk_X509_num(certs); i++) {
523 X509 *x = sk_X509_value(certs, i);
524 if (!CMS_add1_cert(cms, x))
525 goto merr;
526 }
527
528 if (!(flags & CMS_DETACHED))
529 CMS_set_detached(cms, 0);
530
531 if ((flags & (CMS_STREAM | CMS_PARTIAL)) ||
532 CMS_final(cms, data, NULL, flags))
533 return cms;
534 else
535 goto err;
536
537 merr:
538 CMSerror(ERR_R_MALLOC_FAILURE);
539
540 err:
541 CMS_ContentInfo_free(cms);
542
543 return NULL;
544 }
545
546 CMS_ContentInfo *
CMS_sign_receipt(CMS_SignerInfo * si,X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,unsigned int flags)547 CMS_sign_receipt(CMS_SignerInfo *si, X509 *signcert, EVP_PKEY *pkey,
548 STACK_OF(X509) *certs, unsigned int flags)
549 {
550 CMS_SignerInfo *rct_si;
551 CMS_ContentInfo *cms = NULL;
552 ASN1_OCTET_STRING **pos, *os;
553 BIO *rct_cont = NULL;
554 int r = 0;
555
556 flags &= ~(CMS_STREAM | CMS_TEXT);
557 /* Not really detached but avoids content being allocated */
558 flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
559 if (!pkey || !signcert) {
560 CMSerror(CMS_R_NO_KEY_OR_CERT);
561 return NULL;
562 }
563
564 /* Initialize signed data */
565
566 cms = CMS_sign(NULL, NULL, certs, NULL, flags);
567 if (!cms)
568 goto err;
569
570 /* Set inner content type to signed receipt */
571 if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
572 goto err;
573
574 rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
575 if (!rct_si) {
576 CMSerror(CMS_R_ADD_SIGNER_ERROR);
577 goto err;
578 }
579
580 os = cms_encode_Receipt(si);
581 if (!os)
582 goto err;
583
584 /* Set content to digest */
585 rct_cont = BIO_new_mem_buf(os->data, os->length);
586 if (!rct_cont)
587 goto err;
588
589 /* Add msgSigDigest attribute */
590
591 if (!cms_msgSigDigest_add1(rct_si, si))
592 goto err;
593
594 /* Finalize structure */
595 if (!CMS_final(cms, rct_cont, NULL, flags))
596 goto err;
597
598 /* Set embedded content */
599 pos = CMS_get0_content(cms);
600 *pos = os;
601
602 r = 1;
603
604 err:
605 BIO_free(rct_cont);
606 if (r)
607 return cms;
608 CMS_ContentInfo_free(cms);
609
610 return NULL;
611 }
612
613 CMS_ContentInfo *
CMS_encrypt(STACK_OF (X509)* certs,BIO * data,const EVP_CIPHER * cipher,unsigned int flags)614 CMS_encrypt(STACK_OF(X509) *certs, BIO *data, const EVP_CIPHER *cipher,
615 unsigned int flags)
616 {
617 CMS_ContentInfo *cms;
618 int i;
619 X509 *recip;
620
621 cms = CMS_EnvelopedData_create(cipher);
622 if (!cms)
623 goto merr;
624 for (i = 0; i < sk_X509_num(certs); i++) {
625 recip = sk_X509_value(certs, i);
626 if (!CMS_add1_recipient_cert(cms, recip, flags)) {
627 CMSerror(CMS_R_RECIPIENT_ERROR);
628 goto err;
629 }
630 }
631
632 if (!(flags & CMS_DETACHED))
633 CMS_set_detached(cms, 0);
634
635 if ((flags & (CMS_STREAM | CMS_PARTIAL)) ||
636 CMS_final(cms, data, NULL, flags))
637 return cms;
638 else
639 goto err;
640
641 merr:
642 CMSerror(ERR_R_MALLOC_FAILURE);
643 err:
644 CMS_ContentInfo_free(cms);
645
646 return NULL;
647 }
648
649 static int
cms_kari_set1_pkey(CMS_ContentInfo * cms,CMS_RecipientInfo * ri,EVP_PKEY * pk,X509 * cert)650 cms_kari_set1_pkey(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, EVP_PKEY *pk,
651 X509 *cert)
652 {
653 int i;
654 STACK_OF(CMS_RecipientEncryptedKey) *reks;
655 CMS_RecipientEncryptedKey *rek;
656
657 reks = CMS_RecipientInfo_kari_get0_reks(ri);
658 for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
659 int rv;
660
661 rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
662 if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
663 continue;
664 CMS_RecipientInfo_kari_set0_pkey(ri, pk);
665 rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
666 CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
667 if (rv > 0)
668 return 1;
669 return cert == NULL ? 0 : -1;
670 }
671
672 return 0;
673 }
674
675 int
CMS_decrypt_set1_pkey(CMS_ContentInfo * cms,EVP_PKEY * pk,X509 * cert)676 CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
677 {
678 STACK_OF(CMS_RecipientInfo) *ris;
679 CMS_RecipientInfo *ri;
680 int i, r, ri_type;
681 int debug = 0, match_ri = 0;
682
683 ris = CMS_get0_RecipientInfos(cms);
684 if (ris)
685 debug = cms->d.envelopedData->encryptedContentInfo->debug;
686 ri_type = cms_pkey_get_ri_type(pk);
687 if (ri_type == CMS_RECIPINFO_NONE) {
688 CMSerror(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
689 return 0;
690 }
691
692 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
693 ri = sk_CMS_RecipientInfo_value(ris, i);
694 if (CMS_RecipientInfo_type(ri) != ri_type)
695 continue;
696 match_ri = 1;
697 if (ri_type == CMS_RECIPINFO_AGREE) {
698 r = cms_kari_set1_pkey(cms, ri, pk, cert);
699 if (r > 0)
700 return 1;
701 if (r < 0)
702 return 0;
703 }
704 /*
705 * If we have a cert try matching RecipientInfo otherwise try them
706 * all.
707 */
708 else if (!cert || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
709 EVP_PKEY_up_ref(pk);
710 CMS_RecipientInfo_set0_pkey(ri, pk);
711 r = CMS_RecipientInfo_decrypt(cms, ri);
712 CMS_RecipientInfo_set0_pkey(ri, NULL);
713 if (cert) {
714 /*
715 * If not debugging clear any error and return success to
716 * avoid leaking of information useful to MMA
717 */
718 if (!debug) {
719 ERR_clear_error();
720 return 1;
721 }
722 if (r > 0)
723 return 1;
724 CMSerror(CMS_R_DECRYPT_ERROR);
725 return 0;
726 }
727 /*
728 * If no cert and not debugging don't leave loop after first
729 * successful decrypt. Always attempt to decrypt all recipients
730 * to avoid leaking timing of a successful decrypt.
731 */
732 else if (r > 0 && debug)
733 return 1;
734 }
735 }
736 /* If no cert, key transport and not debugging always return success */
737 if (cert == NULL && ri_type == CMS_RECIPINFO_TRANS && match_ri && !debug) {
738 ERR_clear_error();
739 return 1;
740 }
741
742 CMSerror(CMS_R_NO_MATCHING_RECIPIENT);
743
744 return 0;
745 }
746
747 int
CMS_decrypt_set1_key(CMS_ContentInfo * cms,unsigned char * key,size_t keylen,const unsigned char * id,size_t idlen)748 CMS_decrypt_set1_key(CMS_ContentInfo *cms, unsigned char *key, size_t keylen,
749 const unsigned char *id, size_t idlen)
750 {
751 STACK_OF(CMS_RecipientInfo) *ris;
752 CMS_RecipientInfo *ri;
753 int i, r;
754
755 ris = CMS_get0_RecipientInfos(cms);
756 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
757 ri = sk_CMS_RecipientInfo_value(ris, i);
758 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
759 continue;
760
761 /*
762 * If we have an id try matching RecipientInfo otherwise try them
763 * all.
764 */
765 if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
766 CMS_RecipientInfo_set0_key(ri, key, keylen);
767 r = CMS_RecipientInfo_decrypt(cms, ri);
768 CMS_RecipientInfo_set0_key(ri, NULL, 0);
769 if (r > 0)
770 return 1;
771 if (id) {
772 CMSerror(CMS_R_DECRYPT_ERROR);
773 return 0;
774 }
775 ERR_clear_error();
776 }
777 }
778
779 CMSerror(CMS_R_NO_MATCHING_RECIPIENT);
780
781 return 0;
782 }
783
784 int
CMS_decrypt_set1_password(CMS_ContentInfo * cms,unsigned char * pass,ssize_t passlen)785 CMS_decrypt_set1_password(CMS_ContentInfo *cms, unsigned char *pass,
786 ssize_t passlen)
787 {
788 STACK_OF(CMS_RecipientInfo) *ris;
789 CMS_RecipientInfo *ri;
790 int i, r;
791
792 ris = CMS_get0_RecipientInfos(cms);
793 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
794 ri = sk_CMS_RecipientInfo_value(ris, i);
795 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
796 continue;
797 CMS_RecipientInfo_set0_password(ri, pass, passlen);
798 r = CMS_RecipientInfo_decrypt(cms, ri);
799 CMS_RecipientInfo_set0_password(ri, NULL, 0);
800 if (r > 0)
801 return 1;
802 }
803
804 CMSerror(CMS_R_NO_MATCHING_RECIPIENT);
805
806 return 0;
807 }
808
809 int
CMS_decrypt(CMS_ContentInfo * cms,EVP_PKEY * pk,X509 * cert,BIO * dcont,BIO * out,unsigned int flags)810 CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert, BIO *dcont,
811 BIO *out, unsigned int flags)
812 {
813 int r;
814 BIO *cont;
815
816 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped) {
817 CMSerror(CMS_R_TYPE_NOT_ENVELOPED_DATA);
818 return 0;
819 }
820 if (!dcont && !check_content(cms))
821 return 0;
822 if (flags & CMS_DEBUG_DECRYPT)
823 cms->d.envelopedData->encryptedContentInfo->debug = 1;
824 else
825 cms->d.envelopedData->encryptedContentInfo->debug = 0;
826 if (!cert)
827 cms->d.envelopedData->encryptedContentInfo->havenocert = 1;
828 else
829 cms->d.envelopedData->encryptedContentInfo->havenocert = 0;
830 if (!pk && !cert && !dcont && !out)
831 return 1;
832 if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert))
833 return 0;
834 cont = CMS_dataInit(cms, dcont);
835 if (!cont)
836 return 0;
837 r = cms_copy_content(out, cont, flags);
838 do_free_upto(cont, dcont);
839
840 return r;
841 }
842
843 int
CMS_final(CMS_ContentInfo * cms,BIO * data,BIO * dcont,unsigned int flags)844 CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
845 {
846 BIO *cmsbio;
847 int ret = 0;
848
849 if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
850 CMSerror(CMS_R_CMS_LIB);
851 return 0;
852 }
853
854 SMIME_crlf_copy(data, cmsbio, flags);
855
856 (void)BIO_flush(cmsbio);
857
858 if (!CMS_dataFinal(cms, cmsbio)) {
859 CMSerror(CMS_R_CMS_DATAFINAL_ERROR);
860 goto err;
861 }
862
863 ret = 1;
864
865 err:
866 do_free_upto(cmsbio, dcont);
867
868 return ret;
869 }
870
871 #ifdef ZLIB
872
873 int
CMS_uncompress(CMS_ContentInfo * cms,BIO * dcont,BIO * out,unsigned int flags)874 CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)
875 {
876 BIO *cont;
877 int r;
878
879 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
880 CMSerror(CMS_R_TYPE_NOT_COMPRESSED_DATA);
881 return 0;
882 }
883
884 if (!dcont && !check_content(cms))
885 return 0;
886
887 cont = CMS_dataInit(cms, dcont);
888 if (!cont)
889 return 0;
890 r = cms_copy_content(out, cont, flags);
891 do_free_upto(cont, dcont);
892
893 return r;
894 }
895
896 CMS_ContentInfo *
CMS_compress(BIO * in,int comp_nid,unsigned int flags)897 CMS_compress(BIO *in, int comp_nid, unsigned int flags)
898 {
899 CMS_ContentInfo *cms;
900
901 if (comp_nid <= 0)
902 comp_nid = NID_zlib_compression;
903 cms = cms_CompressedData_create(comp_nid);
904 if (!cms)
905 return NULL;
906
907 if (!(flags & CMS_DETACHED))
908 CMS_set_detached(cms, 0);
909
910 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
911 return cms;
912
913 CMS_ContentInfo_free(cms);
914
915 return NULL;
916 }
917
918 #else
919
920 int
CMS_uncompress(CMS_ContentInfo * cms,BIO * dcont,BIO * out,unsigned int flags)921 CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)
922 {
923 CMSerror(CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
924 return 0;
925 }
926
927 CMS_ContentInfo *
CMS_compress(BIO * in,int comp_nid,unsigned int flags)928 CMS_compress(BIO *in, int comp_nid, unsigned int flags)
929 {
930 CMSerror(CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
931 return NULL;
932 }
933
934 #endif
935