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[openssl.git] / crypto / pkcs7 / pk7_smime.c
1 /* pk7_smime.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999-2004 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  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58
59 /* Simple PKCS#7 processing functions */
60
61 #include <stdio.h>
62 #include "cryptlib.h"
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65
66 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
67
68 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
69                   BIO *data, int flags)
70 {
71         PKCS7 *p7;
72         int i;
73
74         if(!(p7 = PKCS7_new()))
75                 {
76                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
77                 return NULL;
78                 }
79
80         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
81                 goto err;
82
83         if (!PKCS7_content_new(p7, NID_pkcs7_data))
84                 goto err;
85
86         if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags))
87                 {
88                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
89                 goto err;
90                 }
91
92         if(!(flags & PKCS7_NOCERTS))
93                 {
94                 for(i = 0; i < sk_X509_num(certs); i++)
95                         {
96                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
97                                 goto err;
98                         }
99                 }
100
101         if(flags & PKCS7_DETACHED)
102                 PKCS7_set_detached(p7, 1);
103
104         if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
105                 return p7;
106
107         if (PKCS7_final(p7, data, flags))
108                 return p7;
109
110         err:
111         PKCS7_free(p7);
112         return NULL;
113 }
114
115 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
116         {
117         BIO *p7bio;
118         int ret = 0;
119         if (!(p7bio = PKCS7_dataInit(p7, NULL)))
120                 {
121                 PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE);
122                 return 0;
123                 }
124
125         SMIME_crlf_copy(data, p7bio, flags);
126
127         BIO_flush(p7bio);
128
129
130         if (!PKCS7_dataFinal(p7,p7bio))
131                 {
132                 PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN);
133                 goto err;
134                 }
135
136         ret = 1;
137
138         err:
139         BIO_free_all(p7bio);
140
141         return ret;
142
143         }
144
145 /* Check to see if a cipher exists and if so add S/MIME capabilities */
146
147 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
148         {
149         if (EVP_get_cipherbynid(nid))
150                 return PKCS7_simple_smimecap(sk, nid, arg);
151         return 1;
152         }
153
154 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
155         {
156         if (EVP_get_digestbynid(nid))
157                 return PKCS7_simple_smimecap(sk, nid, arg);
158         return 1;
159         }
160
161 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
162                                         EVP_PKEY *pkey, const EVP_MD *md,
163                                         int flags)
164         {
165         PKCS7_SIGNER_INFO *si = NULL;
166         int si_free = 1;
167         STACK_OF(X509_ALGOR) *smcap = NULL;
168         if(!X509_check_private_key(signcert, pkey))
169                 {
170                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
171                         PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
172                 return NULL;
173                 }
174
175         if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
176                 {
177                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
178                                 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
179                 return NULL;
180                 }
181
182         /* si is now part of p7 so don't free it on error */
183
184         si_free = 0;
185
186         if(!(flags & PKCS7_NOCERTS))
187                 {
188                 if (!PKCS7_add_certificate(p7, signcert))
189                         goto err;
190                 }
191
192         if(!(flags & PKCS7_NOATTR))
193                 {
194                 if (!PKCS7_add_attrib_content_type(si, NULL))
195                         goto err;
196                 /* Add SMIMECapabilities */
197                 if(!(flags & PKCS7_NOSMIMECAP))
198                         {
199                         if(!(smcap = sk_X509_ALGOR_new_null()))
200                                 {
201                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
202                                         ERR_R_MALLOC_FAILURE);
203                                 goto err;
204                                 }
205                         if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
206                         || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
207                         || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
208                                 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
209                                 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
210                         || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
211                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
212                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
213                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
214                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
215                                 || !PKCS7_add_attrib_smimecap (si, smcap))
216                                 goto err;
217                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
218                         smcap = NULL;
219                         }
220                 if (flags & PKCS7_REUSE_DIGEST)
221                         {
222                         if (!pkcs7_copy_existing_digest(p7, si))
223                                 goto err;
224                         if (!PKCS7_SIGNER_INFO_sign(si))
225                                 goto err;
226                         }
227                 }
228         return si;
229         err:
230         if (smcap)
231                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
232         if (si && si_free)
233                 PKCS7_SIGNER_INFO_free(si);
234         return NULL;
235         }
236
237 /* Search for a digest matching SignerInfo digest type and if found
238  * copy across.
239  */
240
241 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
242         {
243         int i;
244         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
245         PKCS7_SIGNER_INFO *sitmp;
246         ASN1_OCTET_STRING *osdig = NULL;
247         sinfos = PKCS7_get_signer_info(p7);
248         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
249                 {
250                 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
251                 if (si == sitmp)
252                         break;
253                 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
254                         continue;
255                 if (!OBJ_cmp(si->digest_alg->algorithm,
256                                 sitmp->digest_alg->algorithm))
257                         {
258                         osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
259                         break;
260                         }
261
262                 }
263
264         if (osdig)
265                 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
266
267         PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
268                         PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
269         return 0;
270         }
271
272 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
273                                         BIO *indata, BIO *out, int flags)
274 {
275         STACK_OF(X509) *signers;
276         X509 *signer;
277         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
278         PKCS7_SIGNER_INFO *si;
279         X509_STORE_CTX cert_ctx;
280         char buf[4096];
281         int i, j=0, k, ret = 0;
282         BIO *p7bio;
283         BIO *tmpin, *tmpout;
284
285         if(!p7) {
286                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
287                 return 0;
288         }
289
290         if(!PKCS7_type_is_signed(p7)) {
291                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
292                 return 0;
293         }
294
295         /* Check for no data and no content: no data to verify signature */
296         if(PKCS7_get_detached(p7) && !indata) {
297                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
298                 return 0;
299         }
300 #if 0
301         /* NB: this test commented out because some versions of Netscape
302          * illegally include zero length content when signing data.
303          */
304
305         /* Check for data and content: two sets of data */
306         if(!PKCS7_get_detached(p7) && indata) {
307                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
308                 return 0;
309         }
310 #endif
311
312         sinfos = PKCS7_get_signer_info(p7);
313
314         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
315                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
316                 return 0;
317         }
318
319
320         signers = PKCS7_get0_signers(p7, certs, flags);
321
322         if(!signers) return 0;
323
324         /* Now verify the certificates */
325
326         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
327                 signer = sk_X509_value (signers, k);
328                 if (!(flags & PKCS7_NOCHAIN)) {
329                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
330                                                         p7->d.sign->cert))
331                                 {
332                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
333                                 sk_X509_free(signers);
334                                 return 0;
335                                 }
336                         X509_STORE_CTX_set_purpose(&cert_ctx,
337                                                 X509_PURPOSE_SMIME_SIGN);
338                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
339                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
340                         sk_X509_free(signers);
341                         return 0;
342                 }
343                 if (!(flags & PKCS7_NOCRL))
344                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
345                 i = X509_verify_cert(&cert_ctx);
346                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
347                 X509_STORE_CTX_cleanup(&cert_ctx);
348                 if (i <= 0) {
349                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
350                         ERR_add_error_data(2, "Verify error:",
351                                          X509_verify_cert_error_string(j));
352                         sk_X509_free(signers);
353                         return 0;
354                 }
355                 /* Check for revocation status here */
356         }
357
358         /* Performance optimization: if the content is a memory BIO then
359          * store its contents in a temporary read only memory BIO. This
360          * avoids potentially large numbers of slow copies of data which will
361          * occur when reading from a read write memory BIO when signatures
362          * are calculated.
363          */
364
365         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
366                 {
367                 char *ptr;
368                 long len;
369                 len = BIO_get_mem_data(indata, &ptr);
370                 tmpin = BIO_new_mem_buf(ptr, len);
371                 if (tmpin == NULL)
372                         {
373                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
374                         return 0;
375                         }
376                 }
377         else
378                 tmpin = indata;
379                 
380
381         p7bio=PKCS7_dataInit(p7,tmpin);
382
383         if(flags & PKCS7_TEXT) {
384                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
385                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
386                         goto err;
387                 }
388         } else tmpout = out;
389
390         /* We now have to 'read' from p7bio to calculate digests etc. */
391         for (;;)
392         {
393                 i=BIO_read(p7bio,buf,sizeof(buf));
394                 if (i <= 0) break;
395                 if (tmpout) BIO_write(tmpout, buf, i);
396         }
397
398         if(flags & PKCS7_TEXT) {
399                 if(!SMIME_text(tmpout, out)) {
400                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
401                         BIO_free(tmpout);
402                         goto err;
403                 }
404                 BIO_free(tmpout);
405         }
406
407         /* Now Verify All Signatures */
408         if (!(flags & PKCS7_NOSIGS))
409             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
410                 {
411                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
412                 signer = sk_X509_value (signers, i);
413                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
414                 if (j <= 0) {
415                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
416                         goto err;
417                 }
418         }
419
420         ret = 1;
421
422         err:
423         
424         if (tmpin == indata)
425                 {
426                 if (indata) BIO_pop(p7bio);
427                 }
428         BIO_free_all(p7bio);
429
430         sk_X509_free(signers);
431
432         return ret;
433 }
434
435 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
436 {
437         STACK_OF(X509) *signers;
438         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
439         PKCS7_SIGNER_INFO *si;
440         PKCS7_ISSUER_AND_SERIAL *ias;
441         X509 *signer;
442         int i;
443
444         if(!p7) {
445                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
446                 return NULL;
447         }
448
449         if(!PKCS7_type_is_signed(p7)) {
450                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
451                 return NULL;
452         }
453
454         /* Collect all the signers together */
455
456         sinfos = PKCS7_get_signer_info(p7);
457
458         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
459                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
460                 return 0;
461         }
462
463         if(!(signers = sk_X509_new_null())) {
464                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
465                 return NULL;
466         }
467
468         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
469         {
470             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
471             ias = si->issuer_and_serial;
472             signer = NULL;
473                 /* If any certificates passed they take priority */
474             if (certs) signer = X509_find_by_issuer_and_serial (certs,
475                                                 ias->issuer, ias->serial);
476             if (!signer && !(flags & PKCS7_NOINTERN)
477                         && p7->d.sign->cert) signer =
478                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
479                                                 ias->issuer, ias->serial);
480             if (!signer) {
481                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
482                         sk_X509_free(signers);
483                         return 0;
484             }
485
486             sk_X509_push(signers, signer);
487         }
488         return signers;
489 }
490
491
492 /* Build a complete PKCS#7 enveloped data */
493
494 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
495                                                                 int flags)
496 {
497         PKCS7 *p7;
498         BIO *p7bio = NULL;
499         int i;
500         X509 *x509;
501         if(!(p7 = PKCS7_new())) {
502                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
503                 return NULL;
504         }
505
506         PKCS7_set_type(p7, NID_pkcs7_enveloped);
507         if(!PKCS7_set_cipher(p7, cipher)) {
508                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
509                 goto err;
510         }
511
512         for(i = 0; i < sk_X509_num(certs); i++) {
513                 x509 = sk_X509_value(certs, i);
514                 if(!PKCS7_add_recipient(p7, x509)) {
515                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
516                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
517                         goto err;
518                 }
519         }
520
521         if (PKCS7_final(p7, in, flags))
522                 return p7;
523
524         err:
525
526         BIO_free(p7bio);
527         PKCS7_free(p7);
528         return NULL;
529
530 }
531
532 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
533 {
534         BIO *tmpmem;
535         int ret, i;
536         char buf[4096];
537
538         if(!p7) {
539                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
540                 return 0;
541         }
542
543         if(!PKCS7_type_is_enveloped(p7)) {
544                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
545                 return 0;
546         }
547
548         if(cert && !X509_check_private_key(cert, pkey)) {
549                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
550                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
551                 return 0;
552         }
553
554         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
555                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
556                 return 0;
557         }
558
559         if (flags & PKCS7_TEXT) {
560                 BIO *tmpbuf, *bread;
561                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
562                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
563                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
564                         return 0;
565                 }
566                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
567                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
568                         return 0;
569                 }
570                 ret = SMIME_text(bread, data);
571                 BIO_free_all(bread);
572                 return ret;
573         } else {
574                 for(;;) {
575                         i = BIO_read(tmpmem, buf, sizeof(buf));
576                         if(i <= 0) break;
577                         BIO_write(data, buf, i);
578                 }
579                 BIO_free_all(tmpmem);
580                 return 1;
581         }
582 }