1 /*
2 * Copyright 2008-2022 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 return NULL;
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 CMS_ContentInfo_free(cms);
249 return NULL;
250 }
251
CMS_EncryptedData_encrypt(BIO * in,const EVP_CIPHER * cipher,const unsigned char * key,size_t keylen,unsigned int flags)252 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
253 const unsigned char *key,
254 size_t keylen, unsigned int flags)
255 {
256 return CMS_EncryptedData_encrypt_ex(in, cipher, key, keylen, flags, NULL,
257 NULL);
258 }
259
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)260 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
261 X509_STORE *store,
262 STACK_OF(X509) *certs,
263 STACK_OF(X509_CRL) *crls,
264 STACK_OF(X509) **chain,
265 const CMS_CTX *cms_ctx)
266 {
267 X509_STORE_CTX *ctx;
268 X509 *signer;
269 int i, j, r = 0;
270
271 ctx = X509_STORE_CTX_new_ex(ossl_cms_ctx_get0_libctx(cms_ctx),
272 ossl_cms_ctx_get0_propq(cms_ctx));
273 if (ctx == NULL) {
274 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
275 goto err;
276 }
277 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
278 if (!X509_STORE_CTX_init(ctx, store, signer, certs)) {
279 ERR_raise(ERR_LIB_CMS, CMS_R_STORE_INIT_ERROR);
280 goto err;
281 }
282 X509_STORE_CTX_set_default(ctx, "smime_sign");
283 if (crls != NULL)
284 X509_STORE_CTX_set0_crls(ctx, crls);
285
286 i = X509_verify_cert(ctx);
287 if (i <= 0) {
288 j = X509_STORE_CTX_get_error(ctx);
289 ERR_raise_data(ERR_LIB_CMS, CMS_R_CERTIFICATE_VERIFY_ERROR,
290 "Verify error: %s", X509_verify_cert_error_string(j));
291 goto err;
292 }
293 r = 1;
294
295 /* also send back the trust chain when required */
296 if (chain != NULL)
297 *chain = X509_STORE_CTX_get1_chain(ctx);
298 err:
299 X509_STORE_CTX_free(ctx);
300 return r;
301
302 }
303
CMS_verify(CMS_ContentInfo * cms,STACK_OF (X509)* certs,X509_STORE * store,BIO * dcont,BIO * out,unsigned int flags)304 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
305 X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
306 {
307 CMS_SignerInfo *si;
308 STACK_OF(CMS_SignerInfo) *sinfos;
309 STACK_OF(X509) *cms_certs = NULL;
310 STACK_OF(X509_CRL) *crls = NULL;
311 STACK_OF(X509) **si_chains = NULL;
312 X509 *signer;
313 int i, scount = 0, ret = 0;
314 BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
315 int cadesVerify = (flags & CMS_CADES) != 0;
316 const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
317
318 if (dcont == NULL && !check_content(cms))
319 return 0;
320 if (dcont != NULL && !(flags & CMS_BINARY)) {
321 const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
322
323 if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
324 flags |= CMS_ASCIICRLF;
325 }
326
327 /* Attempt to find all signer certificates */
328
329 sinfos = CMS_get0_SignerInfos(cms);
330
331 if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
332 ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
333 goto err;
334 }
335
336 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
337 si = sk_CMS_SignerInfo_value(sinfos, i);
338 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
339 if (signer)
340 scount++;
341 }
342
343 if (scount != sk_CMS_SignerInfo_num(sinfos))
344 scount += CMS_set1_signers_certs(cms, certs, flags);
345
346 if (scount != sk_CMS_SignerInfo_num(sinfos)) {
347 ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
348 goto err;
349 }
350
351 /* Attempt to verify all signers certs */
352 /* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
353
354 if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
355 if (cadesVerify) {
356 /* Certificate trust chain is required to check CAdES signature */
357 si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
358 if (si_chains == NULL) {
359 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
360 goto err;
361 }
362 }
363 cms_certs = CMS_get1_certs(cms);
364 if (!(flags & CMS_NOCRL))
365 crls = CMS_get1_crls(cms);
366 for (i = 0; i < scount; i++) {
367 si = sk_CMS_SignerInfo_value(sinfos, i);
368
369 if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls,
370 si_chains ? &si_chains[i] : NULL,
371 ctx))
372 goto err;
373 }
374 }
375
376 /* Attempt to verify all SignerInfo signed attribute signatures */
377
378 if ((flags & CMS_NO_ATTR_VERIFY) == 0 || cadesVerify) {
379 for (i = 0; i < scount; i++) {
380 si = sk_CMS_SignerInfo_value(sinfos, i);
381 if (CMS_signed_get_attr_count(si) < 0)
382 continue;
383 if (CMS_SignerInfo_verify(si) <= 0)
384 goto err;
385 if (cadesVerify) {
386 STACK_OF(X509) *si_chain = si_chains ? si_chains[i] : NULL;
387
388 if (ossl_cms_check_signing_certs(si, si_chain) <= 0)
389 goto err;
390 }
391 }
392 }
393
394 /*
395 * Performance optimization: if the content is a memory BIO then store
396 * its contents in a temporary read only memory BIO. This avoids
397 * potentially large numbers of slow copies of data which will occur when
398 * reading from a read write memory BIO when signatures are calculated.
399 */
400
401 if (dcont != NULL && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
402 char *ptr;
403 long len;
404
405 len = BIO_get_mem_data(dcont, &ptr);
406 tmpin = (len == 0) ? dcont : BIO_new_mem_buf(ptr, len);
407 if (tmpin == NULL) {
408 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
409 goto err2;
410 }
411 } else {
412 tmpin = dcont;
413 }
414 /*
415 * If not binary mode and detached generate digests by *writing* through
416 * the BIO. That makes it possible to canonicalise the input.
417 */
418 if (!(flags & SMIME_BINARY) && dcont) {
419 /*
420 * Create output BIO so we can either handle text or to ensure
421 * included content doesn't override detached content.
422 */
423 tmpout = cms_get_text_bio(out, flags);
424 if (tmpout == NULL) {
425 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
426 goto err;
427 }
428 cmsbio = CMS_dataInit(cms, tmpout);
429 if (cmsbio == NULL)
430 goto err;
431 /*
432 * Don't use SMIME_TEXT for verify: it adds headers and we want to
433 * remove them.
434 */
435 if (!SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT))
436 goto err;
437
438 if (flags & CMS_TEXT) {
439 if (!SMIME_text(tmpout, out)) {
440 ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
441 goto err;
442 }
443 }
444 } else {
445 cmsbio = CMS_dataInit(cms, tmpin);
446 if (cmsbio == NULL)
447 goto err;
448
449 if (!cms_copy_content(out, cmsbio, flags))
450 goto err;
451
452 }
453 if (!(flags & CMS_NO_CONTENT_VERIFY)) {
454 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
455 si = sk_CMS_SignerInfo_value(sinfos, i);
456 if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
457 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_VERIFY_ERROR);
458 goto err;
459 }
460 }
461 }
462
463 ret = 1;
464 err:
465 if (!(flags & SMIME_BINARY) && dcont) {
466 do_free_upto(cmsbio, tmpout);
467 if (tmpin != dcont)
468 BIO_free(tmpin);
469 } else {
470 if (dcont && (tmpin == dcont))
471 do_free_upto(cmsbio, dcont);
472 else
473 BIO_free_all(cmsbio);
474 }
475
476 if (out != tmpout)
477 BIO_free_all(tmpout);
478
479 err2:
480 if (si_chains != NULL) {
481 for (i = 0; i < scount; ++i)
482 OSSL_STACK_OF_X509_free(si_chains[i]);
483 OPENSSL_free(si_chains);
484 }
485 OSSL_STACK_OF_X509_free(cms_certs);
486 sk_X509_CRL_pop_free(crls, X509_CRL_free);
487
488 return ret;
489 }
490
CMS_verify_receipt(CMS_ContentInfo * rcms,CMS_ContentInfo * ocms,STACK_OF (X509)* certs,X509_STORE * store,unsigned int flags)491 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
492 STACK_OF(X509) *certs,
493 X509_STORE *store, unsigned int flags)
494 {
495 int r;
496
497 flags &= ~(CMS_DETACHED | CMS_TEXT);
498 r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
499 if (r <= 0)
500 return r;
501 return ossl_cms_Receipt_verify(rcms, ocms);
502 }
503
CMS_sign_ex(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,unsigned int flags,OSSL_LIB_CTX * libctx,const char * propq)504 CMS_ContentInfo *CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey,
505 STACK_OF(X509) *certs, BIO *data,
506 unsigned int flags, OSSL_LIB_CTX *libctx,
507 const char *propq)
508 {
509 CMS_ContentInfo *cms;
510 int i;
511
512 cms = CMS_ContentInfo_new_ex(libctx, propq);
513 if (cms == NULL || !CMS_SignedData_init(cms))
514 goto merr;
515 if (flags & CMS_ASCIICRLF
516 && !CMS_set1_eContentType(cms,
517 OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF)))
518 goto err;
519
520 if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
521 ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
522 goto err;
523 }
524
525 for (i = 0; i < sk_X509_num(certs); i++) {
526 X509 *x = sk_X509_value(certs, i);
527
528 if (!CMS_add1_cert(cms, x))
529 goto merr;
530 }
531
532 if (!(flags & CMS_DETACHED))
533 CMS_set_detached(cms, 0);
534
535 if ((flags & (CMS_STREAM | CMS_PARTIAL))
536 || CMS_final(cms, data, NULL, flags))
537 return cms;
538 else
539 goto err;
540
541 merr:
542 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
543
544 err:
545 CMS_ContentInfo_free(cms);
546 return NULL;
547 }
548
CMS_sign(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,unsigned int flags)549 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
550 BIO *data, unsigned int flags)
551 {
552 return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
553 }
554
CMS_sign_receipt(CMS_SignerInfo * si,X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,unsigned int flags)555 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
556 X509 *signcert, EVP_PKEY *pkey,
557 STACK_OF(X509) *certs, unsigned int flags)
558 {
559 CMS_SignerInfo *rct_si;
560 CMS_ContentInfo *cms = NULL;
561 ASN1_OCTET_STRING **pos, *os;
562 BIO *rct_cont = NULL;
563 int r = 0;
564 const CMS_CTX *ctx = si->cms_ctx;
565
566 flags &= ~(CMS_STREAM | CMS_TEXT);
567 /* Not really detached but avoids content being allocated */
568 flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
569 if (pkey == NULL || signcert == NULL) {
570 ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
571 return NULL;
572 }
573
574 /* Initialize signed data */
575
576 cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
577 ossl_cms_ctx_get0_libctx(ctx),
578 ossl_cms_ctx_get0_propq(ctx));
579 if (cms == NULL)
580 goto err;
581
582 /* Set inner content type to signed receipt */
583 if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
584 goto err;
585
586 rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
587 if (!rct_si) {
588 ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
589 goto err;
590 }
591
592 os = ossl_cms_encode_Receipt(si);
593 if (os == NULL)
594 goto err;
595
596 /* Set content to digest */
597 rct_cont = BIO_new_mem_buf(os->data, os->length);
598 if (rct_cont == NULL)
599 goto err;
600
601 /* Add msgSigDigest attribute */
602
603 if (!ossl_cms_msgSigDigest_add1(rct_si, si))
604 goto err;
605
606 /* Finalize structure */
607 if (!CMS_final(cms, rct_cont, NULL, flags))
608 goto err;
609
610 /* Set embedded content */
611 pos = CMS_get0_content(cms);
612 if (pos == NULL)
613 goto err;
614 *pos = os;
615
616 r = 1;
617
618 err:
619 BIO_free(rct_cont);
620 if (r)
621 return cms;
622 CMS_ContentInfo_free(cms);
623 return NULL;
624
625 }
626
CMS_encrypt_ex(STACK_OF (X509)* certs,BIO * data,const EVP_CIPHER * cipher,unsigned int flags,OSSL_LIB_CTX * libctx,const char * propq)627 CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
628 const EVP_CIPHER *cipher, unsigned int flags,
629 OSSL_LIB_CTX *libctx, const char *propq)
630 {
631 CMS_ContentInfo *cms;
632 int i;
633 X509 *recip;
634
635
636 cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
637 ? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
638 : CMS_EnvelopedData_create_ex(cipher, libctx, propq);
639 if (cms == NULL)
640 goto merr;
641 for (i = 0; i < sk_X509_num(certs); i++) {
642 recip = sk_X509_value(certs, i);
643 if (!CMS_add1_recipient_cert(cms, recip, flags)) {
644 ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
645 goto err;
646 }
647 }
648
649 if (!(flags & CMS_DETACHED))
650 CMS_set_detached(cms, 0);
651
652 if ((flags & (CMS_STREAM | CMS_PARTIAL))
653 || CMS_final(cms, data, NULL, flags))
654 return cms;
655 else
656 goto err;
657
658 merr:
659 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
660 err:
661 CMS_ContentInfo_free(cms);
662 return NULL;
663 }
664
CMS_encrypt(STACK_OF (X509)* certs,BIO * data,const EVP_CIPHER * cipher,unsigned int flags)665 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
666 const EVP_CIPHER *cipher, unsigned int flags)
667 {
668 return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
669 }
670
cms_kari_set1_pkey_and_peer(CMS_ContentInfo * cms,CMS_RecipientInfo * ri,EVP_PKEY * pk,X509 * cert,X509 * peer)671 static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
672 CMS_RecipientInfo *ri,
673 EVP_PKEY *pk, X509 *cert, X509 *peer)
674 {
675 int i;
676 STACK_OF(CMS_RecipientEncryptedKey) *reks;
677 CMS_RecipientEncryptedKey *rek;
678
679 reks = CMS_RecipientInfo_kari_get0_reks(ri);
680 for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
681 int rv;
682
683 rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
684 if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
685 continue;
686 CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
687 rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
688 CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
689 if (rv > 0)
690 return 1;
691 return cert == NULL ? 0 : -1;
692 }
693 return 0;
694 }
695
CMS_decrypt_set1_pkey(CMS_ContentInfo * cms,EVP_PKEY * pk,X509 * cert)696 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
697 {
698 return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
699 }
700
CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo * cms,EVP_PKEY * pk,X509 * cert,X509 * peer)701 int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
702 X509 *cert, X509 *peer)
703 {
704 STACK_OF(CMS_RecipientInfo) *ris;
705 CMS_RecipientInfo *ri;
706 int i, r, cms_pkey_ri_type;
707 int debug = 0, match_ri = 0;
708
709 ris = CMS_get0_RecipientInfos(cms);
710 if (ris != NULL)
711 debug = ossl_cms_get0_env_enc_content(cms)->debug;
712
713 cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
714 if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
715 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
716 return 0;
717 }
718
719 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
720 int ri_type;
721
722 ri = sk_CMS_RecipientInfo_value(ris, i);
723 ri_type = CMS_RecipientInfo_type(ri);
724 if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
725 continue;
726 match_ri = 1;
727 if (ri_type == CMS_RECIPINFO_AGREE) {
728 r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
729 if (r > 0)
730 return 1;
731 if (r < 0)
732 return 0;
733 }
734 /*
735 * If we have a cert try matching RecipientInfo otherwise try them
736 * all.
737 */
738 else if (cert == NULL|| !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
739 EVP_PKEY_up_ref(pk);
740 CMS_RecipientInfo_set0_pkey(ri, pk);
741 r = CMS_RecipientInfo_decrypt(cms, ri);
742 CMS_RecipientInfo_set0_pkey(ri, NULL);
743 if (cert != NULL) {
744 /*
745 * If not debugging clear any error and return success to
746 * avoid leaking of information useful to MMA
747 */
748 if (!debug) {
749 ERR_clear_error();
750 return 1;
751 }
752 if (r > 0)
753 return 1;
754 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
755 return 0;
756 }
757 /*
758 * If no cert and not debugging don't leave loop after first
759 * successful decrypt. Always attempt to decrypt all recipients
760 * to avoid leaking timing of a successful decrypt.
761 */
762 else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
763 return 1;
764 }
765 }
766 /* If no cert, key transport and not debugging always return success */
767 if (cert == NULL
768 && cms_pkey_ri_type == CMS_RECIPINFO_TRANS
769 && match_ri
770 && !debug) {
771 ERR_clear_error();
772 return 1;
773 }
774
775 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
776 return 0;
777
778 }
779
CMS_decrypt_set1_key(CMS_ContentInfo * cms,unsigned char * key,size_t keylen,const unsigned char * id,size_t idlen)780 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
781 unsigned char *key, size_t keylen,
782 const unsigned char *id, size_t idlen)
783 {
784 STACK_OF(CMS_RecipientInfo) *ris;
785 CMS_RecipientInfo *ri;
786 int i, r;
787
788 ris = CMS_get0_RecipientInfos(cms);
789 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
790 ri = sk_CMS_RecipientInfo_value(ris, i);
791 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
792 continue;
793
794 /*
795 * If we have an id try matching RecipientInfo otherwise try them
796 * all.
797 */
798 if (id == NULL || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
799 CMS_RecipientInfo_set0_key(ri, key, keylen);
800 r = CMS_RecipientInfo_decrypt(cms, ri);
801 CMS_RecipientInfo_set0_key(ri, NULL, 0);
802 if (r > 0)
803 return 1;
804 if (id != NULL) {
805 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
806 return 0;
807 }
808 ERR_clear_error();
809 }
810 }
811
812 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
813 return 0;
814
815 }
816
CMS_decrypt_set1_password(CMS_ContentInfo * cms,unsigned char * pass,ossl_ssize_t passlen)817 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
818 unsigned char *pass, ossl_ssize_t passlen)
819 {
820 STACK_OF(CMS_RecipientInfo) *ris;
821 CMS_RecipientInfo *ri;
822 int i, r;
823
824 ris = CMS_get0_RecipientInfos(cms);
825 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
826 ri = sk_CMS_RecipientInfo_value(ris, i);
827 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
828 continue;
829 CMS_RecipientInfo_set0_password(ri, pass, passlen);
830 r = CMS_RecipientInfo_decrypt(cms, ri);
831 CMS_RecipientInfo_set0_password(ri, NULL, 0);
832 if (r > 0)
833 return 1;
834 }
835
836 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
837 return 0;
838
839 }
840
CMS_decrypt(CMS_ContentInfo * cms,EVP_PKEY * pk,X509 * cert,BIO * dcont,BIO * out,unsigned int flags)841 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
842 BIO *dcont, BIO *out, unsigned int flags)
843 {
844 int r;
845 BIO *cont;
846
847 int nid = OBJ_obj2nid(CMS_get0_type(cms));
848
849 if (nid != NID_pkcs7_enveloped
850 && nid != NID_id_smime_ct_authEnvelopedData) {
851 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
852 return 0;
853 }
854 if (dcont == NULL && !check_content(cms))
855 return 0;
856 if (flags & CMS_DEBUG_DECRYPT)
857 ossl_cms_get0_env_enc_content(cms)->debug = 1;
858 else
859 ossl_cms_get0_env_enc_content(cms)->debug = 0;
860 if (cert == NULL)
861 ossl_cms_get0_env_enc_content(cms)->havenocert = 1;
862 else
863 ossl_cms_get0_env_enc_content(cms)->havenocert = 0;
864 if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
865 return 1;
866 if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
867 return 0;
868 cont = CMS_dataInit(cms, dcont);
869 if (cont == NULL)
870 return 0;
871 r = cms_copy_content(out, cont, flags);
872 do_free_upto(cont, dcont);
873 return r;
874 }
875
CMS_final(CMS_ContentInfo * cms,BIO * data,BIO * dcont,unsigned int flags)876 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
877 {
878 BIO *cmsbio;
879 int ret = 0;
880
881 if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
882 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
883 return 0;
884 }
885
886 if (!SMIME_crlf_copy(data, cmsbio, flags)) {
887 goto err;
888 }
889
890 (void)BIO_flush(cmsbio);
891
892 if (!CMS_dataFinal(cms, cmsbio)) {
893 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
894 goto err;
895 }
896
897 ret = 1;
898
899 err:
900 do_free_upto(cmsbio, dcont);
901
902 return ret;
903
904 }
905
CMS_final_digest(CMS_ContentInfo * cms,const unsigned char * md,unsigned int mdlen,BIO * dcont,unsigned int flags)906 int CMS_final_digest(CMS_ContentInfo *cms,
907 const unsigned char *md, unsigned int mdlen,
908 BIO *dcont, unsigned int flags)
909 {
910 BIO *cmsbio;
911 int ret = 0;
912
913 if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
914 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
915 return 0;
916 }
917
918 (void)BIO_flush(cmsbio);
919
920 if (!ossl_cms_DataFinal(cms, cmsbio, md, mdlen)) {
921 ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
922 goto err;
923 }
924 ret = 1;
925
926 err:
927 do_free_upto(cmsbio, dcont);
928 return ret;
929 }
930
931 #ifdef ZLIB
932
CMS_uncompress(CMS_ContentInfo * cms,BIO * dcont,BIO * out,unsigned int flags)933 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
934 unsigned int flags)
935 {
936 BIO *cont;
937 int r;
938
939 if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
940 ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
941 return 0;
942 }
943
944 if (dcont == NULL && !check_content(cms))
945 return 0;
946
947 cont = CMS_dataInit(cms, dcont);
948 if (cont == NULL)
949 return 0;
950 r = cms_copy_content(out, cont, flags);
951 do_free_upto(cont, dcont);
952 return r;
953 }
954
CMS_compress(BIO * in,int comp_nid,unsigned int flags)955 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
956 {
957 CMS_ContentInfo *cms;
958
959 if (comp_nid <= 0)
960 comp_nid = NID_zlib_compression;
961 cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
962 if (cms == NULL)
963 return NULL;
964
965 if (!(flags & CMS_DETACHED))
966 CMS_set_detached(cms, 0);
967
968 if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
969 return cms;
970
971 CMS_ContentInfo_free(cms);
972 return NULL;
973 }
974
975 #else
976
CMS_uncompress(CMS_ContentInfo * cms,BIO * dcont,BIO * out,unsigned int flags)977 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
978 unsigned int flags)
979 {
980 ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
981 return 0;
982 }
983
CMS_compress(BIO * in,int comp_nid,unsigned int flags)984 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
985 {
986 ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
987 return NULL;
988 }
989
990 #endif
991
