More support for KEK RecipientInfo.
[openssl.git] / crypto / cms / cms_smime.c
1 /* crypto/cms/cms_smime.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer. 
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    licensing@OpenSSL.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  */
53
54 #include "cryptlib.h"
55 #include <openssl/asn1t.h>
56 #include <openssl/x509.h>
57 #include <openssl/x509v3.h>
58 #include <openssl/err.h>
59 #include <openssl/cms.h>
60 #include "cms_lcl.h"
61
62 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
63         {
64         unsigned char buf[4096];
65         int r = 0, i;
66         BIO *tmpout = NULL;
67
68         if(flags & CMS_TEXT)
69                 {
70                 tmpout = BIO_new(BIO_s_mem());
71                 if(!tmpout)
72                         {
73                         CMSerr(CMS_F_CMS_COPY_CONTENT,ERR_R_MALLOC_FAILURE);
74                         goto err;
75                         }
76                 }
77         else
78                 tmpout = out;
79
80         /* Read all content through chain to process digest, decrypt etc */
81         for (;;)
82         {
83                 i=BIO_read(in,buf,sizeof(buf));
84                 if (i <= 0)
85                         {
86                         if (BIO_method_type(in) == BIO_TYPE_CIPHER)
87                                 {
88                                 if (!BIO_get_cipher_status(in))
89                                         goto err;
90                                 }
91                         break;
92                         }
93                                 
94                 if (tmpout)
95                         BIO_write(tmpout, buf, i);
96         }
97
98         if(flags & CMS_TEXT)
99                 {
100                 if(!SMIME_text(tmpout, out))
101                         {
102                         CMSerr(CMS_F_CMS_COPY_CONTENT,CMS_R_SMIME_TEXT_ERROR);
103                         goto err;
104                         }
105                 }
106
107         r = 1;
108
109         err:
110         if (tmpout && (tmpout != out))
111                 BIO_free(tmpout);
112         return r;
113
114         }
115
116 static int check_content(CMS_ContentInfo *cms)
117         {
118         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
119         if (!pos || !*pos)
120                 {
121                 CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
122                 return 0;
123                 }
124         return 1;
125         }
126
127 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
128         {
129         BIO *cont;
130         int r;
131         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
132                 {
133                 CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
134                 return 0;
135                 }
136         cont = CMS_dataInit(cms, NULL);
137         if (!cont)
138                 return 0;
139         r = cms_copy_content(out, cont, flags);
140         BIO_free_all(cont);
141         return r;
142         }
143
144 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
145         {
146         CMS_ContentInfo *cms;
147         cms = cms_Data_create();
148         if (!cms)
149                 return NULL;
150
151         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
152                 return cms;
153
154         CMS_ContentInfo_free(cms);
155
156         return NULL;
157         }
158
159 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
160                                                         unsigned int flags)
161         {
162         BIO *cont;
163         int r;
164         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
165                 {
166                 CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
167                 return 0;
168                 }
169
170         if (!dcont && !check_content(cms))
171                 return 0;
172
173         cont = CMS_dataInit(cms, dcont);
174         if (!cont)
175                 return 0;
176         r = cms_copy_content(out, cont, flags);
177         if (r)
178                 r = cms_DigestedData_do_final(cms, cont, 1);
179         BIO_free_all(cont);
180         return r;
181         }
182
183 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
184                                         unsigned int flags)
185         {
186         CMS_ContentInfo *cms;
187         if (!md)
188                 md = EVP_sha1();
189         cms = cms_DigestedData_create(md);
190         if (!cms)
191                 return NULL;
192
193         if(!(flags & CMS_DETACHED))
194                 CMS_set_detached(cms, 0);
195
196         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
197                 return cms;
198
199         CMS_ContentInfo_free(cms);
200         return NULL;
201         }
202
203 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
204                                 const unsigned char *key, size_t keylen,
205                                 BIO *dcont, BIO *out, unsigned int flags)
206         {
207         BIO *cont;
208         int r;
209         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
210                 {
211                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
212                                         CMS_R_TYPE_NOT_ENCRYPTED_DATA);
213                 return 0;
214                 }
215
216         if (!dcont && !check_content(cms))
217                 return 0;
218
219         if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
220                 return 0;
221         cont = CMS_dataInit(cms, dcont);
222         if (!cont)
223                 return 0;
224         r = cms_copy_content(out, cont, flags);
225         BIO_free_all(cont);
226         return r;
227         }
228
229 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
230                                         const unsigned char *key, size_t keylen,
231                                         unsigned int flags)
232         {
233         CMS_ContentInfo *cms;
234         if (!cipher)
235                 {
236                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
237                 return NULL;
238                 }
239         cms = CMS_ContentInfo_new();
240         if (!cms)
241                 return NULL;
242         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
243                 return NULL;
244
245         if(!(flags & CMS_DETACHED))
246                 CMS_set_detached(cms, 0);
247
248         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
249                 return cms;
250
251         CMS_ContentInfo_free(cms);
252         return NULL;
253         }
254
255 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
256                                         X509_STORE *store,
257                                         STACK_OF(X509) *certs,
258                                         STACK_OF(X509_CRL) *crls,
259                                         unsigned int flags)
260         {
261         X509_STORE_CTX ctx;
262         X509 *signer;
263         int i, j, r = 0;
264         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
265         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
266                 {
267                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
268                                                 CMS_R_STORE_INIT_ERROR);
269                 goto err;
270                 }
271         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
272         if (crls)
273                 X509_STORE_CTX_set0_crls(&ctx, crls);
274
275         i = X509_verify_cert(&ctx);
276         if (i <= 0)
277                 {
278                 j = X509_STORE_CTX_get_error(&ctx);
279                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
280                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
281                 ERR_add_error_data(2, "Verify error:",
282                                          X509_verify_cert_error_string(j));
283                 goto err;
284                 }
285         r = 1;
286         err:
287         X509_STORE_CTX_cleanup(&ctx);
288         return r;
289
290         }
291
292 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
293                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
294         {
295         CMS_SignerInfo *si;
296         STACK_OF(CMS_SignerInfo) *sinfos;
297         STACK_OF(X509) *cms_certs = NULL;
298         STACK_OF(X509_CRL) *crls = NULL;
299         X509 *signer;
300         int i, scount = 0, ret = 0;
301         BIO *cmsbio = NULL, *tmpin = NULL;
302
303         if (!dcont && !check_content(cms))
304                 return 0;
305
306         /* Attempt to find all signer certificates */
307
308         sinfos = CMS_get0_SignerInfos(cms);
309
310         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
311                 {
312                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
313                 goto err;
314                 }
315
316         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
317                 {
318                 si = sk_CMS_SignerInfo_value(sinfos, i);
319                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
320                 if (signer)
321                         scount++;
322                 }
323
324         if (scount != sk_CMS_SignerInfo_num(sinfos))
325                 scount += CMS_set1_signers_certs(cms, certs, flags);
326
327         if (scount != sk_CMS_SignerInfo_num(sinfos))
328                 {
329                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
330                 goto err;
331                 }
332
333         /* Attempt to verify all signers certs */
334
335         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
336                 {
337                 cms_certs = CMS_get1_certs(cms);
338                 crls = CMS_get1_crls(cms);
339                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
340                         {
341                         si = sk_CMS_SignerInfo_value(sinfos, i);
342                         if (!cms_signerinfo_verify_cert(si, store,
343                                                         cms_certs, crls, flags))
344                                 goto err;
345                         }
346                 }
347
348         /* Attempt to verify all SignerInfo signed attribute signatures */
349
350         if (!(flags & CMS_NO_ATTR_VERIFY))
351                 {
352                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
353                         {
354                         si = sk_CMS_SignerInfo_value(sinfos, i);
355                         if (CMS_signed_get_attr_count(si) < 0)
356                                 continue;
357                         if (CMS_SignerInfo_verify(si) <= 0)
358                                 goto err;
359                         }
360                 }
361
362         /* Performance optimization: if the content is a memory BIO then
363          * store its contents in a temporary read only memory BIO. This
364          * avoids potentially large numbers of slow copies of data which will
365          * occur when reading from a read write memory BIO when signatures
366          * are calculated.
367          */
368
369         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
370                 {
371                 char *ptr;
372                 long len;
373                 len = BIO_get_mem_data(dcont, &ptr);
374                 tmpin = BIO_new_mem_buf(ptr, len);
375                 if (tmpin == NULL)
376                         {
377                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
378                         return 0;
379                         }
380                 }
381         else
382                 tmpin = dcont;
383                 
384
385         cmsbio=CMS_dataInit(cms, tmpin);
386         if (!cmsbio)
387                 goto err;
388
389         if (!cms_copy_content(out, cmsbio, flags))
390                 goto err;
391
392         if (!(flags & CMS_NO_CONTENT_VERIFY))
393                 {
394                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
395                         {
396                         si = sk_CMS_SignerInfo_value(sinfos, i);
397                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
398                                 {
399                                 CMSerr(CMS_F_CMS_VERIFY,
400                                         CMS_R_CONTENT_VERIFY_ERROR);
401                                 goto err;
402                                 }
403                         }
404                 }
405
406         ret = 1;
407
408         err:
409         
410         if (dcont && (tmpin == dcont))
411                 BIO_pop(cmsbio);
412         BIO_free_all(cmsbio);
413
414         if (cms_certs)
415                 sk_X509_pop_free(cms_certs, X509_free);
416         if (crls)
417                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
418
419         return ret;
420         }
421
422 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
423                                                 BIO *data, unsigned int flags)
424         {
425         CMS_ContentInfo *cms;
426         int i;
427         cms = CMS_ContentInfo_new();
428         if (!cms)
429                 goto merr;
430         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
431                 {
432                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
433                 goto err;
434                 }
435         for (i = 0; i < sk_X509_num(certs); i++)
436                 {
437                 X509 *x = sk_X509_value(certs, i);
438                 if (!CMS_add1_cert(cms, x))
439                         goto merr;
440                 }
441         /* If no signer or certs initialize signedData */
442         if (!pkey && !i && !CMS_SignedData_init(cms))
443                 goto merr;
444
445         if(!(flags & CMS_DETACHED))
446                 CMS_set_detached(cms, 0);
447
448         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
449                 return cms;
450
451         return cms;
452
453         merr:
454         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
455
456         err:
457         if (cms)
458                 CMS_ContentInfo_free(cms);
459         return NULL;
460         }
461
462 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
463                                 const EVP_CIPHER *cipher, unsigned int flags)
464         {
465         CMS_ContentInfo *cms;
466         int i;
467         X509 *recip;
468         cms = CMS_EnvelopedData_create(cipher);
469         if (!cms)
470                 goto merr;
471         for (i = 0; i < sk_X509_num(certs); i++)
472                 {
473                 recip = sk_X509_value(certs, i);
474                 if (!CMS_add1_recipient_cert(cms, recip, flags))
475                         {
476                         CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR);
477                         goto err;
478                         }
479                 }
480
481         if(!(flags & CMS_DETACHED))
482                 CMS_set_detached(cms, 0);
483
484         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
485                 return cms;
486
487         return cms;
488
489         merr:
490         CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE);
491         err:
492         if (cms)
493                 CMS_ContentInfo_free(cms);
494         return NULL;
495         }
496         
497 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
498                                 BIO *dcont, BIO *out,
499                                 unsigned int flags)
500         {
501         int i, r;
502         BIO *cont;
503         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
504                 {
505                 CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
506                 return 0;
507                 }
508         if (!dcont && !check_content(cms))
509                 return 0;
510         if (pk)
511                 {
512                 STACK_OF(CMS_RecipientInfo) *ris;
513                 CMS_RecipientInfo *ri;
514                 ris = CMS_get0_RecipientInfos(cms);
515                 for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
516                         {
517                         ri = sk_CMS_RecipientInfo_value(ris, i);
518                         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
519                                 continue;
520                         /* If we have a cert try matching RecipientInfo
521                          * otherwise try them all.
522                          */
523                         if (!cert ||
524                         (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0))
525                                 {
526                                 CMS_RecipientInfo_set0_pkey(ri, pk);
527                                 r = CMS_RecipientInfo_decrypt(cms, ri);
528                                 CMS_RecipientInfo_set0_pkey(ri, NULL);
529                                 if (r > 0)
530                                         break;
531                                 if (cert)
532                                         return 0;
533                                 }
534                         }
535
536                 if (i == sk_CMS_RecipientInfo_num(ris))
537                         {
538                         CMSerr(CMS_F_CMS_DECRYPT, CMS_R_NO_MATCHING_RECIPIENT);
539                         return 0;
540                         }
541                 }
542         cont = CMS_dataInit(cms, dcont);
543         if (!cont)
544                 return 0;
545         r = cms_copy_content(out, cont, flags);
546         BIO_free_all(cont);
547         return r;
548         }
549
550 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
551         {
552         BIO *cmsbio;
553         int ret = 0;
554         if (!(cmsbio = CMS_dataInit(cms, NULL)))
555                 {
556                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
557                 return 0;
558                 }
559
560         SMIME_crlf_copy(data, cmsbio, flags);
561
562         (void)BIO_flush(cmsbio);
563
564
565         if (!CMS_dataFinal(cms, cmsbio))
566                 {
567                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
568                 goto err;
569                 }
570
571         ret = 1;
572
573         err:
574         BIO_free_all(cmsbio);
575
576         return ret;
577
578         }
579
580 #ifdef ZLIB
581
582 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
583                                                         unsigned int flags)
584         {
585         BIO *cont;
586         int r;
587         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
588                 {
589                 CMSerr(CMS_F_CMS_UNCOMPRESS,
590                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
591                 return 0;
592                 }
593
594         if (!dcont && !check_content(cms))
595                 return 0;
596
597         cont = CMS_dataInit(cms, dcont);
598         if (!cont)
599                 return 0;
600         r = cms_copy_content(out, cont, flags);
601         BIO_free_all(cont);
602         return r;
603         }
604
605 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
606         {
607         CMS_ContentInfo *cms;
608         if (comp_nid <= 0)
609                 comp_nid = NID_zlib_compression;
610         cms = cms_CompressedData_create(comp_nid);
611         if (!cms)
612                 return NULL;
613
614         if(!(flags & CMS_DETACHED))
615                 CMS_set_detached(cms, 0);
616
617         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
618                 return cms;
619
620         CMS_ContentInfo_free(cms);
621         return NULL;
622         }
623
624 #else
625
626 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
627                                                         unsigned int flags)
628         {
629         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
630         return 0;
631         }
632
633 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
634         {
635         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
636         return NULL;
637         }
638
639 #endif