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
PKCS7_sign(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,int flags)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
PKCS7_final(PKCS7 * p7,BIO * data,int flags)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
add_cipher_smcap(STACK_OF (X509_ALGOR)* sk,int nid,int arg)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
add_digest_smcap(STACK_OF (X509_ALGOR)* sk,int nid,int arg)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
PKCS7_sign_add_signer(PKCS7 * p7,X509 * signcert,EVP_PKEY * pkey,const EVP_MD * md,int flags)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
pkcs7_copy_existing_digest(PKCS7 * p7,PKCS7_SIGNER_INFO * si)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
PKCS7_verify(PKCS7 * p7,STACK_OF (X509)* certs,X509_STORE * store,BIO * indata,BIO * out,int flags)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_default(&cert_ctx, "smime_sign");
331 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
332 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
333 sk_X509_free(signers);
334 return 0;
335 }
336 if (!(flags & PKCS7_NOCRL))
337 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
338 i = X509_verify_cert(&cert_ctx);
339 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
340 X509_STORE_CTX_cleanup(&cert_ctx);
341 if (i <= 0) {
342 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
343 ERR_add_error_data(2, "Verify error:",
344 X509_verify_cert_error_string(j));
345 sk_X509_free(signers);
346 return 0;
347 }
348 /* Check for revocation status here */
349 }
350
351 /* Performance optimization: if the content is a memory BIO then
352 * store its contents in a temporary read only memory BIO. This
353 * avoids potentially large numbers of slow copies of data which will
354 * occur when reading from a read write memory BIO when signatures
355 * are calculated.
356 */
357
358 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
359 {
360 char *ptr;
361 long len;
362 len = BIO_get_mem_data(indata, &ptr);
363 tmpin = BIO_new_mem_buf(ptr, len);
364 if (tmpin == NULL)
365 {
366 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
367 return 0;
368 }
369 }
370 else
371 tmpin = indata;
372
373
374 if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
375 goto err;
376
377 if(flags & PKCS7_TEXT) {
378 if(!(tmpout = BIO_new(BIO_s_mem()))) {
379 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
380 goto err;
381 }
382 BIO_set_mem_eof_return(tmpout, 0);
383 } else tmpout = out;
384
385 /* We now have to 'read' from p7bio to calculate digests etc. */
386 for (;;)
387 {
388 i=BIO_read(p7bio,buf,sizeof(buf));
389 if (i <= 0) break;
390 if (tmpout) BIO_write(tmpout, buf, i);
391 }
392
393 if(flags & PKCS7_TEXT) {
394 if(!SMIME_text(tmpout, out)) {
395 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
396 BIO_free(tmpout);
397 goto err;
398 }
399 BIO_free(tmpout);
400 }
401
402 /* Now Verify All Signatures */
403 if (!(flags & PKCS7_NOSIGS))
404 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
405 {
406 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
407 signer = sk_X509_value (signers, i);
408 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
409 if (j <= 0) {
410 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
411 goto err;
412 }
413 }
414
415 ret = 1;
416
417 err:
418
419 if (tmpin == indata)
420 {
421 if (indata) BIO_pop(p7bio);
422 }
423 BIO_free_all(p7bio);
424
425 sk_X509_free(signers);
426
427 return ret;
428 }
429
STACK_OF(X509)430 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
431 {
432 STACK_OF(X509) *signers;
433 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
434 PKCS7_SIGNER_INFO *si;
435 PKCS7_ISSUER_AND_SERIAL *ias;
436 X509 *signer;
437 int i;
438
439 if(!p7) {
440 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
441 return NULL;
442 }
443
444 if(!PKCS7_type_is_signed(p7)) {
445 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
446 return NULL;
447 }
448
449 /* Collect all the signers together */
450
451 sinfos = PKCS7_get_signer_info(p7);
452
453 if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
454 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
455 return 0;
456 }
457
458 if(!(signers = sk_X509_new_null())) {
459 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
460 return NULL;
461 }
462
463 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
464 {
465 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
466 ias = si->issuer_and_serial;
467 signer = NULL;
468 /* If any certificates passed they take priority */
469 if (certs) signer = X509_find_by_issuer_and_serial (certs,
470 ias->issuer, ias->serial);
471 if (!signer && !(flags & PKCS7_NOINTERN)
472 && p7->d.sign->cert) signer =
473 X509_find_by_issuer_and_serial (p7->d.sign->cert,
474 ias->issuer, ias->serial);
475 if (!signer) {
476 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
477 sk_X509_free(signers);
478 return 0;
479 }
480
481 if (!sk_X509_push(signers, signer)) {
482 sk_X509_free(signers);
483 return NULL;
484 }
485 }
486 return signers;
487 }
488
489
490 /* Build a complete PKCS#7 enveloped data */
491
PKCS7_encrypt(STACK_OF (X509)* certs,BIO * in,const EVP_CIPHER * cipher,int flags)492 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
493 int flags)
494 {
495 PKCS7 *p7;
496 BIO *p7bio = NULL;
497 int i;
498 X509 *x509;
499 if(!(p7 = PKCS7_new())) {
500 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
501 return NULL;
502 }
503
504 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
505 goto err;
506 if (!PKCS7_set_cipher(p7, cipher)) {
507 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
508 goto err;
509 }
510
511 for(i = 0; i < sk_X509_num(certs); i++) {
512 x509 = sk_X509_value(certs, i);
513 if(!PKCS7_add_recipient(p7, x509)) {
514 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
515 PKCS7_R_ERROR_ADDING_RECIPIENT);
516 goto err;
517 }
518 }
519
520 if (flags & PKCS7_STREAM)
521 return p7;
522
523 if (PKCS7_final(p7, in, flags))
524 return p7;
525
526 err:
527
528 BIO_free_all(p7bio);
529 PKCS7_free(p7);
530 return NULL;
531
532 }
533
PKCS7_decrypt(PKCS7 * p7,EVP_PKEY * pkey,X509 * cert,BIO * data,int flags)534 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
535 {
536 BIO *tmpmem;
537 int ret, i;
538 char buf[4096];
539
540 if(!p7) {
541 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
542 return 0;
543 }
544
545 if(!PKCS7_type_is_enveloped(p7)) {
546 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
547 return 0;
548 }
549
550 if(cert && !X509_check_private_key(cert, pkey)) {
551 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
552 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
553 return 0;
554 }
555
556 if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
557 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
558 return 0;
559 }
560
561 if (flags & PKCS7_TEXT) {
562 BIO *tmpbuf, *bread;
563 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
564 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
565 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
566 BIO_free_all(tmpmem);
567 return 0;
568 }
569 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
570 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
571 BIO_free_all(tmpbuf);
572 BIO_free_all(tmpmem);
573 return 0;
574 }
575 ret = SMIME_text(bread, data);
576 BIO_free_all(bread);
577 return ret;
578 } else {
579 for(;;) {
580 i = BIO_read(tmpmem, buf, sizeof(buf));
581 if(i <= 0) break;
582 BIO_write(data, buf, i);
583 }
584 BIO_free_all(tmpmem);
585 return 1;
586 }
587 }
588