1 /*
2 * Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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/x509.h>
13 #include <openssl/x509v3.h>
14 #include <openssl/err.h>
15 #include <openssl/cms.h>
16 #include "cms_local.h"
17 #include "crypto/asn1.h"
18
cms_get_text_bio(BIO *out, unsigned int flags)19 static BIO *cms_get_text_bio(BIO *out, unsigned int flags)
20 {
21 BIO *rbio;
22
23 if (out == NULL)
24 rbio = BIO_new(BIO_s_null());
25 else if (flags & CMS_TEXT) {
26 rbio = BIO_new(BIO_s_mem());
27 BIO_set_mem_eof_return(rbio, 0);
28 } else
29 rbio = out;
30 return rbio;
31 }
32
cms_copy_content(BIO *out, BIO *in, unsigned int flags)33 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
34 {
35 unsigned char buf[4096];
36 int r = 0, i;
37 BIO *tmpout;
38
39 tmpout = cms_get_text_bio(out, flags);
40
41 if (tmpout == NULL) {
42 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
43 goto err;
44 }
45
46 /* Read all content through chain to process digest, decrypt etc */
47 for (;;) {
48 i = BIO_read(in, buf, sizeof(buf));
49 if (i <= 0) {
50 if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
51 if (BIO_get_cipher_status(in) <= 0)
52 goto err;
53 }
54 if (i < 0)
55 goto err;
56 break;
57 }
58
59 if (tmpout != NULL && (BIO_write(tmpout, buf, i) != i))
60 goto err;
61 }
62
63 if (flags & CMS_TEXT) {
64 if (!SMIME_text(tmpout, out)) {
65 ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
66 goto err;
67 }
68 }
69
70 r = 1;
71 err:
72 if (tmpout != out)
73 BIO_free(tmpout);
74 return r;
75
76 }
77
check_content(CMS_ContentInfo *cms)78 static int check_content(CMS_ContentInfo *cms)
79 {
80 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
81
82 if (pos == NULL || *pos == NULL) {
83 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
84 return 0;
85 }
86 return 1;
87 }
88
do_free_upto(BIO *f, BIO *upto)89 static void do_free_upto(BIO *f, BIO *upto)
90 {
91 if (upto != NULL) {
92 BIO *tbio;
93
94 do {
95 tbio = BIO_pop(f);
96 BIO_free(f);
97 f = tbio;
98 } while (f != NULL && f != upto);
99 } else {
100 BIO_free_all(f);
101 }
102 }
103
CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)104 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
105 {
106 BIO *cont;
107 int r;
108
109 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) {
110 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DATA);
111 return 0;
112 }
113 cont = CMS_dataInit(cms, NULL);
114 if (cont == NULL)
115 return 0;
116 r = cms_copy_content(out, cont, flags);
117 BIO_free_all(cont);
118 return r;
119 }
120
CMS_data_create_ex(BIO *in, unsigned int flags, OSSL_LIB_CTX *libctx, const char *propq)121 CMS_ContentInfo *CMS_data_create_ex(BIO *in, unsigned int flags,
122 OSSL_LIB_CTX *libctx, const char *propq)
123 {
124 CMS_ContentInfo *cms = ossl_cms_Data_create(libctx, propq);
125
126 if (cms == NULL)
127 return NULL;
128
129 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
130 return cms;
131
132 CMS_ContentInfo_free(cms);
133 return NULL;
134 }
135
CMS_data_create(BIO *in, unsigned int flags)136 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
137 {
138 return CMS_data_create_ex(in, flags, NULL, NULL);
139 }
140
CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)141 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
142 unsigned int flags)
143 {
144 BIO *cont;
145 int r;
146
147 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) {
148 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DIGESTED_DATA);
149 return 0;
150 }
151
152 if (dcont == NULL && !check_content(cms))
153 return 0;
154
155 cont = CMS_dataInit(cms, dcont);
156 if (cont == NULL)
157 return 0;
158
159 r = cms_copy_content(out, cont, flags);
160 if (r)
161 r = ossl_cms_DigestedData_do_final(cms, cont, 1);
162 do_free_upto(cont, dcont);
163 return r;
164 }
165
CMS_digest_create_ex(BIO *in, const EVP_MD *md, unsigned int flags, OSSL_LIB_CTX *ctx, const char *propq)166 CMS_ContentInfo *CMS_digest_create_ex(BIO *in, const EVP_MD *md,
167 unsigned int flags, OSSL_LIB_CTX *ctx,
168 const char *propq)
169 {
170 CMS_ContentInfo *cms;
171
172 /*
173 * Because the EVP_MD is cached and can be a legacy algorithm, we
174 * cannot fetch the algorithm if it isn't supplied.
175 */
176 if (md == NULL)
177 md = EVP_sha1();
178 cms = ossl_cms_DigestedData_create(md, ctx, propq);
179 if (cms == NULL)
180 return NULL;
181
182 if (!(flags & CMS_DETACHED))
183 CMS_set_detached(cms, 0);
184
185 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
186 return cms;
187
188 CMS_ContentInfo_free(cms);
189 return NULL;
190 }
191
CMS_digest_create(BIO *in, const EVP_MD *md, unsigned int flags)192 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
193 unsigned int flags)
194 {
195 return CMS_digest_create_ex(in, md, flags, NULL, NULL);
196 }
197
CMS_EncryptedData_decrypt(CMS_ContentInfo *cms, const unsigned char *key, size_t keylen, BIO *dcont, BIO *out, unsigned int flags)198 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
199 const unsigned char *key, size_t keylen,
200 BIO *dcont, BIO *out, unsigned int flags)
201 {
202 BIO *cont;
203 int r;
204
205 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) {
206 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENCRYPTED_DATA);
207 return 0;
208 }
209
210 if (dcont == NULL && !check_content(cms))
211 return 0;
212
213 if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
214 return 0;
215 cont = CMS_dataInit(cms, dcont);
216 if (cont == NULL)
217 return 0;
218 r = cms_copy_content(out, cont, flags);
219 do_free_upto(cont, dcont);
220 return r;
221 }
222
CMS_EncryptedData_encrypt_ex(BIO *in, const EVP_CIPHER *cipher, const unsigned char *key, size_t keylen, unsigned int flags, OSSL_LIB_CTX *libctx, const char *propq)223 CMS_ContentInfo *CMS_EncryptedData_encrypt_ex(BIO *in, const EVP_CIPHER *cipher,
224 const unsigned char *key,
225 size_t keylen, unsigned int flags,
226 OSSL_LIB_CTX *libctx,
227 const char *propq)
228 {
229 CMS_ContentInfo *cms;
230
231 if (cipher == NULL) {
232 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CIPHER);
233 return NULL;
234 }
235 cms = CMS_ContentInfo_new_ex(libctx, propq);
236 if (cms == NULL)
237 return NULL;
238 if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
239 goto err;
240
241 if (!(flags & CMS_DETACHED))
242 CMS_set_detached(cms, 0);
243
244 if ((flags & (CMS_STREAM | CMS_PARTIAL))
245 || CMS_final(cms, in, NULL, flags))
246 return cms;
247
248 err:
249 CMS_ContentInfo_free(cms);
250 return NULL;
251 }
252
CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher, const unsigned char *key, size_t keylen, unsigned int flags)253 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
254 const unsigned char *key,
255 size_t keylen, unsigned int flags)
256 {
257 return CMS_EncryptedData_encrypt_ex(in, cipher, key, keylen, flags, NULL,
258 NULL);
259 }
260
cms_signerinfo_verify_cert(CMS_SignerInfo *si, X509_STORE *store, STACK_OF(X509) *certs, STACK_OF(X509_CRL) *crls, STACK_OF(X509) **chain, const CMS_CTX *cms_ctx)261 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
262 X509_STORE *store,
263 STACK_OF(X509) *certs,
264 STACK_OF(X509_CRL) *crls,
265 STACK_OF(X509) **chain,
266 const CMS_CTX *cms_ctx)
267 {
268 X509_STORE_CTX *ctx;
269 X509 *signer;
270 int i, j, r = 0;
271
272 ctx = X509_STORE_CTX_new_ex(ossl_cms_ctx_get0_libctx(cms_ctx),
273 ossl_cms_ctx_get0_propq(cms_ctx));
274 if (ctx == NULL) {
275 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
276 goto err;
277 }
278 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
279 if (!X509_STORE_CTX_init(ctx, store, signer, certs)) {
280 ERR_raise(ERR_LIB_CMS, CMS_R_STORE_INIT_ERROR);
281 goto err;
282 }
283 X509_STORE_CTX_set_default(ctx, "smime_sign");
284 if (crls != NULL)
285 X509_STORE_CTX_set0_crls(ctx, crls);
286
287 i = X509_verify_cert(ctx);
288 if (i <= 0) {
289 j = X509_STORE_CTX_get_error(ctx);
290 ERR_raise_data(ERR_LIB_CMS, CMS_R_CERTIFICATE_VERIFY_ERROR,
291 "Verify error: %s", X509_verify_cert_error_string(j));
292 goto err;
293 }
294 r = 1;
295
296 /* also send back the trust chain when required */
297 if (chain != NULL)
298 *chain = X509_STORE_CTX_get1_chain(ctx);
299 err:
300 X509_STORE_CTX_free(ctx);
301 return r;
302
303 }
304
CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs, X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)305 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
306 X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
307 {
308 CMS_SignerInfo *si;
309 STACK_OF(CMS_SignerInfo) *sinfos;
310 STACK_OF(X509) *cms_certs = NULL;
311 STACK_OF(X509_CRL) *crls = NULL;
312 STACK_OF(X509) **si_chains = NULL;
313 X509 *signer;
314 int i, scount = 0, ret = 0;
315 BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
316 int cadesVerify = (flags & CMS_CADES) != 0;
317 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
318
319 if (dcont == NULL && !check_content(cms))
320 return 0;
321 if (dcont != NULL && !(flags & CMS_BINARY)) {
322 const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
323
324 if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
325 flags |= CMS_ASCIICRLF;
326 }
327
328 /* Attempt to find all signer certificates */
329
330 sinfos = CMS_get0_SignerInfos(cms);
331
332 if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
333 ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
334 goto err;
335 }
336
337 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
338 si = sk_CMS_SignerInfo_value(sinfos, i);
339 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
340 if (signer)
341 scount++;
342 }
343
344 if (scount != sk_CMS_SignerInfo_num(sinfos))
345 scount += CMS_set1_signers_certs(cms, certs, flags);
346
347 if (scount != sk_CMS_SignerInfo_num(sinfos)) {
348 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
349 goto err;
350 }
351
352 /* Attempt to verify all signers certs */
353 /* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
354
355 if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
356 if (cadesVerify) {
357 /* Certificate trust chain is required to check CAdES signature */
358 si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
359 if (si_chains == NULL) {
360 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
361 goto err;
362 }
363 }
364 cms_certs = CMS_get1_certs(cms);
365 if (!(flags & CMS_NOCRL))
366 crls = CMS_get1_crls(cms);
367 for (i = 0; i < scount; i++) {
368 si = sk_CMS_SignerInfo_value(sinfos, i);
369
370 if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls,
371 si_chains ? &si_chains[i] : NULL,
372 ctx))
373 goto err;
374 }
375 }
376
377 /* Attempt to verify all SignerInfo signed attribute signatures */
378
379 if ((flags & CMS_NO_ATTR_VERIFY) == 0 || cadesVerify) {
380 for (i = 0; i < scount; i++) {
381 si = sk_CMS_SignerInfo_value(sinfos, i);
382 if (CMS_signed_get_attr_count(si) < 0)
383 continue;
384 if (CMS_SignerInfo_verify(si) <= 0)
385 goto err;
386 if (cadesVerify) {
387 STACK_OF(X509) *si_chain = si_chains ? si_chains[i] : NULL;
388
389 if (ossl_cms_check_signing_certs(si, si_chain) <= 0)
390 goto err;
391 }
392 }
393 }
394
395 /*
396 * Performance optimization: if the content is a memory BIO then store
397 * its contents in a temporary read only memory BIO. This avoids
398 * potentially large numbers of slow copies of data which will occur when
399 * reading from a read write memory BIO when signatures are calculated.
400 */
401
402 if (dcont != NULL && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
403 char *ptr;
404 long len;
405
406 len = BIO_get_mem_data(dcont, &ptr);
407 tmpin = (len == 0) ? dcont : BIO_new_mem_buf(ptr, len);
408 if (tmpin == NULL) {
409 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
410 goto err2;
411 }
412 } else {
413 tmpin = dcont;
414 }
415 /*
416 * If not binary mode and detached generate digests by *writing* through
417 * the BIO. That makes it possible to canonicalise the input.
418 */
419 if (!(flags & SMIME_BINARY) && dcont) {
420 /*
421 * Create output BIO so we can either handle text or to ensure
422 * included content doesn't override detached content.
423 */
424 tmpout = cms_get_text_bio(out, flags);
425 if (tmpout == NULL) {
426 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
427 goto err;
428 }
429 cmsbio = CMS_dataInit(cms, tmpout);
430 if (cmsbio == NULL)
431 goto err;
432 /*
433 * Don't use SMIME_TEXT for verify: it adds headers and we want to
434 * remove them.
435 */
436 if (!SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT))
437 goto err;
438
439 if (flags & CMS_TEXT) {
440 if (!SMIME_text(tmpout, out)) {
441 ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
442 goto err;
443 }
444 }
445 } else {
446 cmsbio = CMS_dataInit(cms, tmpin);
447 if (cmsbio == NULL)
448 goto err;
449
450 if (!cms_copy_content(out, cmsbio, flags))
451 goto err;
452
453 }
454 if (!(flags & CMS_NO_CONTENT_VERIFY)) {
455 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
456 si = sk_CMS_SignerInfo_value(sinfos, i);
457 if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
458 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_VERIFY_ERROR);
459 goto err;
460 }
461 }
462 }
463
464 ret = 1;
465 err:
466 if (!(flags & SMIME_BINARY) && dcont) {
467 do_free_upto(cmsbio, tmpout);
468 if (tmpin != dcont)
469 BIO_free(tmpin);
470 } else {
471 if (dcont && (tmpin == dcont))
472 do_free_upto(cmsbio, dcont);
473 else
474 BIO_free_all(cmsbio);
475 }
476
477 if (out != tmpout)
478 BIO_free_all(tmpout);
479
480 err2:
481 if (si_chains != NULL) {
482 for (i = 0; i < scount; ++i)
483 sk_X509_pop_free(si_chains[i], X509_free);
484 OPENSSL_free(si_chains);
485 }
486 sk_X509_pop_free(cms_certs, X509_free);
487 sk_X509_CRL_pop_free(crls, X509_CRL_free);
488
489 return ret;
490 }
491
CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms, STACK_OF(X509) *certs, X509_STORE *store, unsigned int flags)492 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
493 STACK_OF(X509) *certs,
494 X509_STORE *store, unsigned int flags)
495 {
496 int r;
497
498 flags &= ~(CMS_DETACHED | CMS_TEXT);
499 r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
500 if (r <= 0)
501 return r;
502 return ossl_cms_Receipt_verify(rcms, ocms);
503 }
504
CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data, unsigned int flags, OSSL_LIB_CTX *libctx, const char *propq)505 CMS_ContentInfo *CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey,
506 STACK_OF(X509) *certs, BIO *data,
507 unsigned int flags, OSSL_LIB_CTX *libctx,
508 const char *propq)
509 {
510 CMS_ContentInfo *cms;
511 int i;
512
513 cms = CMS_ContentInfo_new_ex(libctx, propq);
514 if (cms == NULL || !CMS_SignedData_init(cms))
515 goto merr;
516 if (flags & CMS_ASCIICRLF
517 && !CMS_set1_eContentType(cms,
518 OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF)))
519 goto err;
520
521 if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
522 ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
523 goto err;
524 }
525
526 for (i = 0; i < sk_X509_num(certs); i++) {
527 X509 *x = sk_X509_value(certs, i);
528
529 if (!CMS_add1_cert(cms, x))
530 goto merr;
531 }
532
533 if (!(flags & CMS_DETACHED))
534 CMS_set_detached(cms, 0);
535
536 if ((flags & (CMS_STREAM | CMS_PARTIAL))
537 || CMS_final(cms, data, NULL, flags))
538 return cms;
539 else
540 goto err;
541
542 merr:
543 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
544
545 err:
546 CMS_ContentInfo_free(cms);
547 return NULL;
548 }
549
CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data, unsigned int flags)550 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
551 BIO *data, unsigned int flags)
552 {
553 return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
554 }
555
CMS_sign_receipt(CMS_SignerInfo *si, X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, unsigned int flags)556 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
557 X509 *signcert, EVP_PKEY *pkey,
558 STACK_OF(X509) *certs, unsigned int flags)
559 {
560 CMS_SignerInfo *rct_si;
561 CMS_ContentInfo *cms = NULL;
562 ASN1_OCTET_STRING **pos, *os;
563 BIO *rct_cont = NULL;
564 int r = 0;
565 const CMS_CTX *ctx = si->cms_ctx;
566
567 flags &= ~(CMS_STREAM | CMS_TEXT);
568 /* Not really detached but avoids content being allocated */
569 flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
570 if (pkey == NULL || signcert == NULL) {
571 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
572 return NULL;
573 }
574
575 /* Initialize signed data */
576
577 cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
578 ossl_cms_ctx_get0_libctx(ctx),
579 ossl_cms_ctx_get0_propq(ctx));
580 if (cms == NULL)
581 goto err;
582
583 /* Set inner content type to signed receipt */
584 if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
585 goto err;
586
587 rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
588 if (!rct_si) {
589 ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
590 goto err;
591 }
592
593 os = ossl_cms_encode_Receipt(si);
594 if (os == NULL)
595 goto err;
596
597 /* Set content to digest */
598 rct_cont = BIO_new_mem_buf(os->data, os->length);
599 if (rct_cont == NULL)
600 goto err;
601
602 /* Add msgSigDigest attribute */
603
604 if (!ossl_cms_msgSigDigest_add1(rct_si, si))
605 goto err;
606
607 /* Finalize structure */
608 if (!CMS_final(cms, rct_cont, NULL, flags))
609 goto err;
610
611 /* Set embedded content */
612 pos = CMS_get0_content(cms);
613 if (pos == NULL)
614 goto err;
615 *pos = os;
616
617 r = 1;
618
619 err:
620 BIO_free(rct_cont);
621 if (r)
622 return cms;
623 CMS_ContentInfo_free(cms);
624 return NULL;
625
626 }
627
STACK_OFnull628 CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
629 const EVP_CIPHER *cipher, unsigned int flags,
630 OSSL_LIB_CTX *libctx, const char *propq)
631 {
632 CMS_ContentInfo *cms;
633 int i;
634 X509 *recip;
635
636
637 cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
638 ? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
639 : CMS_EnvelopedData_create_ex(cipher, libctx, propq);
640 if (cms == NULL)
641 goto merr;
642 for (i = 0; i < sk_X509_num(certs); i++) {
643 recip = sk_X509_value(certs, i);
644 if (!CMS_add1_recipient_cert(cms, recip, flags)) {
645 ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
646 goto err;
647 }
648 }
649
650 if (!(flags & CMS_DETACHED))
651 CMS_set_detached(cms, 0);
652
653 if ((flags & (CMS_STREAM | CMS_PARTIAL))
654 || CMS_final(cms, data, NULL, flags))
655 return cms;
656 else
657 goto err;
658
659 merr:
660 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
661 err:
662 CMS_ContentInfo_free(cms);
663 return NULL;
664 }
665
STACK_OFnull666 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
667 const EVP_CIPHER *cipher, unsigned int flags)
668 {
669 return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
670 }
671
cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, EVP_PKEY *pk, X509 *cert, X509 *peer)672 static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
673 CMS_RecipientInfo *ri,
674 EVP_PKEY *pk, X509 *cert, X509 *peer)
675 {
676 int i;
677 STACK_OF(CMS_RecipientEncryptedKey) *reks;
678 CMS_RecipientEncryptedKey *rek;
679
680 reks = CMS_RecipientInfo_kari_get0_reks(ri);
681 for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
682 int rv;
683
684 rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
685 if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
686 continue;
687 CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
688 rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
689 CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
690 if (rv > 0)
691 return 1;
692 return cert == NULL ? 0 : -1;
693 }
694 return 0;
695 }
696
CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)697 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
698 {
699 return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
700 }
701
CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert, X509 *peer)702 int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
703 X509 *cert, X509 *peer)
704 {
705 STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
706 CMS_RecipientInfo *ri;
707 int i, r, cms_pkey_ri_type;
708 int debug = 0, match_ri = 0;
709 CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
710
711 /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
712 if (ec != NULL) {
713 OPENSSL_clear_free(ec->key, ec->keylen);
714 ec->key = NULL;
715 ec->keylen = 0;
716 }
717
718 if (ris != NULL && ec != NULL)
719 debug = ec->debug;
720
721 cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
722 if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
723 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
724 return 0;
725 }
726
727 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
728 int ri_type;
729
730 ri = sk_CMS_RecipientInfo_value(ris, i);
731 ri_type = CMS_RecipientInfo_type(ri);
732 if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
733 continue;
734 match_ri = 1;
735 if (ri_type == CMS_RECIPINFO_AGREE) {
736 r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
737 if (r > 0)
738 return 1;
739 if (r < 0)
740 return 0;
741 }
742 /* If we have a cert, try matching RecipientInfo, else try them all */
743 else if (cert == NULL || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
744 EVP_PKEY_up_ref(pk);
745 CMS_RecipientInfo_set0_pkey(ri, pk);
746 r = CMS_RecipientInfo_decrypt(cms, ri);
747 CMS_RecipientInfo_set0_pkey(ri, NULL);
748 if (cert != NULL) {
749 /*
750 * If not debugging clear any error and return success to
751 * avoid leaking of information useful to MMA
752 */
753 if (!debug) {
754 ERR_clear_error();
755 return 1;
756 }
757 if (r > 0)
758 return 1;
759 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
760 return 0;
761 }
762 /*
763 * If no cert and not debugging don't leave loop after first
764 * successful decrypt. Always attempt to decrypt all recipients
765 * to avoid leaking timing of a successful decrypt.
766 */
767 else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
768 return 1;
769 }
770 }
771 /* If no cert, key transport and not debugging always return success */
772 if (cert == NULL
773 && cms_pkey_ri_type == CMS_RECIPINFO_TRANS
774 && match_ri
775 && !debug) {
776 ERR_clear_error();
777 return 1;
778 }
779
780 if (!match_ri)
781 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
782 return 0;
783
784 }
785
CMS_decrypt_set1_key(CMS_ContentInfo *cms, unsigned char *key, size_t keylen, const unsigned char *id, size_t idlen)786 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
787 unsigned char *key, size_t keylen,
788 const unsigned char *id, size_t idlen)
789 {
790 STACK_OF(CMS_RecipientInfo) *ris;
791 CMS_RecipientInfo *ri;
792 int i, r, match_ri = 0;
793
794 ris = CMS_get0_RecipientInfos(cms);
795 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
796 ri = sk_CMS_RecipientInfo_value(ris, i);
797 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
798 continue;
799
800 /* If we have an id, try matching RecipientInfo, else try them all */
801 if (id == NULL
802 || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
803 match_ri = 1;
804 CMS_RecipientInfo_set0_key(ri, key, keylen);
805 r = CMS_RecipientInfo_decrypt(cms, ri);
806 CMS_RecipientInfo_set0_key(ri, NULL, 0);
807 if (r > 0)
808 return 1;
809 if (id != NULL) {
810 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
811 return 0;
812 }
813 ERR_clear_error();
814 }
815 }
816
817 if (!match_ri)
818 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
819 return 0;
820
821 }
822
CMS_decrypt_set1_password(CMS_ContentInfo *cms, unsigned char *pass, ossl_ssize_t passlen)823 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
824 unsigned char *pass, ossl_ssize_t passlen)
825 {
826 STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
827 CMS_RecipientInfo *ri;
828 int i, r, match_ri = 0;
829 CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
830
831 /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
832 if (ec != NULL) {
833 OPENSSL_clear_free(ec->key, ec->keylen);
834 ec->key = NULL;
835 ec->keylen = 0;
836 }
837
838 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
839 ri = sk_CMS_RecipientInfo_value(ris, i);
840 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
841 continue;
842
843 /* Must try each PasswordRecipientInfo */
844 match_ri = 1;
845 CMS_RecipientInfo_set0_password(ri, pass, passlen);
846 r = CMS_RecipientInfo_decrypt(cms, ri);
847 CMS_RecipientInfo_set0_password(ri, NULL, 0);
848 if (r > 0)
849 return 1;
850 }
851
852 if (!match_ri)
853 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
854 return 0;
855
856 }
857
CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert, BIO *dcont, BIO *out, unsigned int flags)858 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
859 BIO *dcont, BIO *out, unsigned int flags)
860 {
861 int r;
862 BIO *cont;
863 CMS_EncryptedContentInfo *ec;
864 int nid = OBJ_obj2nid(CMS_get0_type(cms));
865
866 if (nid != NID_pkcs7_enveloped
867 && nid != NID_id_smime_ct_authEnvelopedData) {
868 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
869 return 0;
870 }
871 if (dcont == NULL && !check_content(cms))
872 return 0;
873 ec = ossl_cms_get0_env_enc_content(cms);
874 ec->debug = (flags & CMS_DEBUG_DECRYPT) != 0;
875 ec->havenocert = cert == NULL;
876 if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
877 return 1;
878 if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
879 return 0;
880 cont = CMS_dataInit(cms, dcont);
881 if (cont == NULL)
882 return 0;
883 r = cms_copy_content(out, cont, flags);
884 do_free_upto(cont, dcont);
885 return r;
886 }
887
CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)888 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
889 {
890 BIO *cmsbio;
891 int ret = 0;
892
893 if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
894 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
895 return 0;
896 }
897
898 if (!SMIME_crlf_copy(data, cmsbio, flags)) {
899 goto err;
900 }
901
902 (void)BIO_flush(cmsbio);
903
904 if (!CMS_dataFinal(cms, cmsbio)) {
905 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
906 goto err;
907 }
908
909 ret = 1;
910
911 err:
912 do_free_upto(cmsbio, dcont);
913
914 return ret;
915
916 }
917
918 #ifdef ZLIB
919
CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)920 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
921 unsigned int flags)
922 {
923 BIO *cont;
924 int r;
925
926 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
927 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
928 return 0;
929 }
930
931 if (dcont == NULL && !check_content(cms))
932 return 0;
933
934 cont = CMS_dataInit(cms, dcont);
935 if (cont == NULL)
936 return 0;
937 r = cms_copy_content(out, cont, flags);
938 do_free_upto(cont, dcont);
939 return r;
940 }
941
CMS_compress(BIO *in, int comp_nid, unsigned int flags)942 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
943 {
944 CMS_ContentInfo *cms;
945
946 if (comp_nid <= 0)
947 comp_nid = NID_zlib_compression;
948 cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
949 if (cms == NULL)
950 return NULL;
951
952 if (!(flags & CMS_DETACHED))
953 CMS_set_detached(cms, 0);
954
955 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
956 return cms;
957
958 CMS_ContentInfo_free(cms);
959 return NULL;
960 }
961
962 #else
963
CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags)964 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
965 unsigned int flags)
966 {
967 ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
968 return 0;
969 }
970
CMS_compress(BIO *in, int comp_nid, unsigned int flags)971 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
972 {
973 ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
974 return NULL;
975 }
976
977 #endif
978