a577141d3b0a143bbad03c12c8bb804c4581033e
[openssl.git] / crypto / pkcs7 / pk7_smime.c
1 /* pk7_smime.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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         (void)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         STACK_OF(X509_ALGOR) *smcap = NULL;
167         if(!X509_check_private_key(signcert, pkey))
168                 {
169                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
170                         PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
171                 return NULL;
172                 }
173
174         if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
175                 {
176                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
177                                 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
178                 return NULL;
179                 }
180
181         if(!(flags & PKCS7_NOCERTS))
182                 {
183                 if (!PKCS7_add_certificate(p7, signcert))
184                         goto err;
185                 }
186
187         if(!(flags & PKCS7_NOATTR))
188                 {
189                 if (!PKCS7_add_attrib_content_type(si, NULL))
190                         goto err;
191                 /* Add SMIMECapabilities */
192                 if(!(flags & PKCS7_NOSMIMECAP))
193                         {
194                         if(!(smcap = sk_X509_ALGOR_new_null()))
195                                 {
196                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
197                                         ERR_R_MALLOC_FAILURE);
198                                 goto err;
199                                 }
200                         if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
201                         || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
202                         || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
203                                 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
204                                 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
205                         || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
206                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
207                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
208                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
209                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
210                                 || !PKCS7_add_attrib_smimecap (si, smcap))
211                                 goto err;
212                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
213                         smcap = NULL;
214                         }
215                 if (flags & PKCS7_REUSE_DIGEST)
216                         {
217                         if (!pkcs7_copy_existing_digest(p7, si))
218                                 goto err;
219                         if (!(flags & PKCS7_PARTIAL) &&
220                                         !PKCS7_SIGNER_INFO_sign(si))
221                                 goto err;
222                         }
223                 }
224         return si;
225         err:
226         if (smcap)
227                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
228         return NULL;
229         }
230
231 /* Search for a digest matching SignerInfo digest type and if found
232  * copy across.
233  */
234
235 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
236         {
237         int i;
238         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
239         PKCS7_SIGNER_INFO *sitmp;
240         ASN1_OCTET_STRING *osdig = NULL;
241         sinfos = PKCS7_get_signer_info(p7);
242         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
243                 {
244                 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
245                 if (si == sitmp)
246                         break;
247                 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
248                         continue;
249                 if (!OBJ_cmp(si->digest_alg->algorithm,
250                                 sitmp->digest_alg->algorithm))
251                         {
252                         osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
253                         break;
254                         }
255
256                 }
257
258         if (osdig)
259                 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
260
261         PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
262                         PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
263         return 0;
264         }
265
266 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
267                                         BIO *indata, BIO *out, int flags)
268 {
269         STACK_OF(X509) *signers;
270         X509 *signer;
271         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
272         PKCS7_SIGNER_INFO *si;
273         X509_STORE_CTX cert_ctx;
274         char buf[4096];
275         int i, j=0, k, ret = 0;
276         BIO *p7bio;
277         BIO *tmpin, *tmpout;
278
279         if(!p7) {
280                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
281                 return 0;
282         }
283
284         if(!PKCS7_type_is_signed(p7)) {
285                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
286                 return 0;
287         }
288
289         /* Check for no data and no content: no data to verify signature */
290         if(PKCS7_get_detached(p7) && !indata) {
291                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
292                 return 0;
293         }
294 #if 0
295         /* NB: this test commented out because some versions of Netscape
296          * illegally include zero length content when signing data.
297          */
298
299         /* Check for data and content: two sets of data */
300         if(!PKCS7_get_detached(p7) && indata) {
301                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
302                 return 0;
303         }
304 #endif
305
306         sinfos = PKCS7_get_signer_info(p7);
307
308         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
309                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
310                 return 0;
311         }
312
313
314         signers = PKCS7_get0_signers(p7, certs, flags);
315
316         if(!signers) return 0;
317
318         /* Now verify the certificates */
319
320         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
321                 signer = sk_X509_value (signers, k);
322                 if (!(flags & PKCS7_NOCHAIN)) {
323                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
324                                                         p7->d.sign->cert))
325                                 {
326                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
327                                 sk_X509_free(signers);
328                                 return 0;
329                                 }
330                         X509_STORE_CTX_set_purpose(&cert_ctx,
331                                                 X509_PURPOSE_SMIME_SIGN);
332                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
333                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
334                         sk_X509_free(signers);
335                         return 0;
336                 }
337                 if (!(flags & PKCS7_NOCRL))
338                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
339                 i = X509_verify_cert(&cert_ctx);
340                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
341                 X509_STORE_CTX_cleanup(&cert_ctx);
342                 if (i <= 0) {
343                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
344                         ERR_add_error_data(2, "Verify error:",
345                                          X509_verify_cert_error_string(j));
346                         sk_X509_free(signers);
347                         return 0;
348                 }
349                 /* Check for revocation status here */
350         }
351
352         /* Performance optimization: if the content is a memory BIO then
353          * store its contents in a temporary read only memory BIO. This
354          * avoids potentially large numbers of slow copies of data which will
355          * occur when reading from a read write memory BIO when signatures
356          * are calculated.
357          */
358
359         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
360                 {
361                 char *ptr;
362                 long len;
363                 len = BIO_get_mem_data(indata, &ptr);
364                 tmpin = BIO_new_mem_buf(ptr, len);
365                 if (tmpin == NULL)
366                         {
367                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
368                         return 0;
369                         }
370                 }
371         else
372                 tmpin = indata;
373                 
374
375         if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
376                 goto err;
377
378         if(flags & PKCS7_TEXT) {
379                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
380                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
381                         goto err;
382                 }
383                 BIO_set_mem_eof_return(tmpout, 0);
384         } else tmpout = out;
385
386         /* We now have to 'read' from p7bio to calculate digests etc. */
387         for (;;)
388         {
389                 i=BIO_read(p7bio,buf,sizeof(buf));
390                 if (i <= 0) break;
391                 if (tmpout) BIO_write(tmpout, buf, i);
392         }
393
394         if(flags & PKCS7_TEXT) {
395                 if(!SMIME_text(tmpout, out)) {
396                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
397                         BIO_free(tmpout);
398                         goto err;
399                 }
400                 BIO_free(tmpout);
401         }
402
403         /* Now Verify All Signatures */
404         if (!(flags & PKCS7_NOSIGS))
405             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
406                 {
407                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
408                 signer = sk_X509_value (signers, i);
409                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
410                 if (j <= 0) {
411                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
412                         goto err;
413                 }
414         }
415
416         ret = 1;
417
418         err:
419         
420         if (tmpin == indata)
421                 {
422                 if (indata) BIO_pop(p7bio);
423                 }
424         BIO_free_all(p7bio);
425
426         sk_X509_free(signers);
427
428         return ret;
429 }
430
431 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
432 {
433         STACK_OF(X509) *signers;
434         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
435         PKCS7_SIGNER_INFO *si;
436         PKCS7_ISSUER_AND_SERIAL *ias;
437         X509 *signer;
438         int i;
439
440         if(!p7) {
441                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
442                 return NULL;
443         }
444
445         if(!PKCS7_type_is_signed(p7)) {
446                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
447                 return NULL;
448         }
449
450         /* Collect all the signers together */
451
452         sinfos = PKCS7_get_signer_info(p7);
453
454         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
455                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
456                 return 0;
457         }
458
459         if(!(signers = sk_X509_new_null())) {
460                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
461                 return NULL;
462         }
463
464         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
465         {
466             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
467             ias = si->issuer_and_serial;
468             signer = NULL;
469                 /* If any certificates passed they take priority */
470             if (certs) signer = X509_find_by_issuer_and_serial (certs,
471                                                 ias->issuer, ias->serial);
472             if (!signer && !(flags & PKCS7_NOINTERN)
473                         && p7->d.sign->cert) signer =
474                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
475                                                 ias->issuer, ias->serial);
476             if (!signer) {
477                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
478                         sk_X509_free(signers);
479                         return 0;
480             }
481
482             if (!sk_X509_push(signers, signer)) {
483                 sk_X509_free(signers);
484                 return NULL;
485             }
486         }
487         return signers;
488 }
489
490
491 /* Build a complete PKCS#7 enveloped data */
492
493 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
494                                                                 int flags)
495 {
496         PKCS7 *p7;
497         BIO *p7bio = NULL;
498         int i;
499         X509 *x509;
500         if(!(p7 = PKCS7_new())) {
501                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
502                 return NULL;
503         }
504
505         if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
506                 goto err;
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 (flags & PKCS7_STREAM)
522                 return p7;
523
524         if (PKCS7_final(p7, in, flags))
525                 return p7;
526
527         err:
528
529         BIO_free_all(p7bio);
530         PKCS7_free(p7);
531         return NULL;
532
533 }
534
535 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
536 {
537         BIO *tmpmem;
538         int ret, i;
539         char buf[4096];
540
541         if(!p7) {
542                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
543                 return 0;
544         }
545
546         if(!PKCS7_type_is_enveloped(p7)) {
547                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
548                 return 0;
549         }
550
551         if(cert && !X509_check_private_key(cert, pkey)) {
552                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
553                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
554                 return 0;
555         }
556
557         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
558                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
559                 return 0;
560         }
561
562         if (flags & PKCS7_TEXT) {
563                 BIO *tmpbuf, *bread;
564                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
565                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
566                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
567                         BIO_free_all(tmpmem);
568                         return 0;
569                 }
570                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
571                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
572                         BIO_free_all(tmpbuf);
573                         BIO_free_all(tmpmem);
574                         return 0;
575                 }
576                 ret = SMIME_text(bread, data);
577                 BIO_free_all(bread);
578                 return ret;
579         } else {
580                 for(;;) {
581                         i = BIO_read(tmpmem, buf, sizeof(buf));
582                         if(i <= 0) break;
583                         BIO_write(data, buf, i);
584                 }
585                 BIO_free_all(tmpmem);
586                 return 1;
587         }
588 }