1 /* pk7_smime.c */
2 /*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 * project.
5 */
6 /* ====================================================================
7 * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60 /* Simple PKCS#7 processing functions */
61
62 #include <stdio.h>
63 #include "cryptlib.h"
64 #include <openssl/x509.h>
65 #include <openssl/x509v3.h>
66
PKCS7_sign(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,int flags)67 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
68 BIO *data, int flags)
69 {
70 PKCS7 *p7 = NULL;
71 PKCS7_SIGNER_INFO *si;
72 BIO *p7bio = NULL;
73 STACK_OF(X509_ALGOR) *smcap = NULL;
74 int i;
75
76 if (!X509_check_private_key(signcert, pkey)) {
77 PKCS7err(PKCS7_F_PKCS7_SIGN,
78 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
79 return NULL;
80 }
81
82 if (!(p7 = PKCS7_new())) {
83 PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
84 return NULL;
85 }
86
87 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
88 goto err;
89
90 if (!PKCS7_content_new(p7, NID_pkcs7_data))
91 goto err;
92
93 #if defined(OPENSSL_SYS_UEFI)
94 /*
95 * NOTE: Update to SHA-256 digest algorithm for UEFI version.
96 */
97 if (!(si = PKCS7_add_signature(p7, signcert, pkey, EVP_sha256()))) {
98 #else
99 if (!(si = PKCS7_add_signature(p7, signcert, pkey, EVP_sha1()))) {
100 #endif
101 PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
102 goto err;
103 }
104
105 if (!(flags & PKCS7_NOCERTS)) {
106 if (!PKCS7_add_certificate(p7, signcert))
107 goto err;
108 if (certs)
109 for (i = 0; i < sk_X509_num(certs); i++)
110 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
111 goto err;
112 }
113
114 if (!(flags & PKCS7_NOATTR)) {
115 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
116 V_ASN1_OBJECT,
117 OBJ_nid2obj(NID_pkcs7_data)))
118 goto err;
119 /* Add SMIMECapabilities */
120 if (!(flags & PKCS7_NOSMIMECAP)) {
121 if (!(smcap = sk_X509_ALGOR_new_null())) {
122 PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
123 goto err;
124 }
125 #ifndef OPENSSL_NO_DES
126 if (!PKCS7_simple_smimecap(smcap, NID_des_ede3_cbc, -1))
127 goto err;
128 #endif
129 #ifndef OPENSSL_NO_RC2
130 if (!PKCS7_simple_smimecap(smcap, NID_rc2_cbc, 128))
131 goto err;
132 if (!PKCS7_simple_smimecap(smcap, NID_rc2_cbc, 64))
133 goto err;
134 #endif
135 #ifndef OPENSSL_NO_DES
136 if (!PKCS7_simple_smimecap(smcap, NID_des_cbc, -1))
137 goto err;
138 #endif
139 #ifndef OPENSSL_NO_RC2
140 if (!PKCS7_simple_smimecap(smcap, NID_rc2_cbc, 40))
141 goto err;
142 #endif
143 if (!PKCS7_add_attrib_smimecap(si, smcap))
144 goto err;
145 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
146 smcap = NULL;
147 }
148 }
149
150 if (flags & PKCS7_DETACHED)
151 PKCS7_set_detached(p7, 1);
152
153 if (flags & PKCS7_STREAM)
154 return p7;
155
156 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
157 PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
158 goto err;
159 }
160
161 SMIME_crlf_copy(data, p7bio, flags);
162
163 if (!PKCS7_dataFinal(p7, p7bio)) {
164 PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_DATASIGN);
165 goto err;
166 }
167
168 BIO_free_all(p7bio);
169 return p7;
170 err:
171 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
172 BIO_free_all(p7bio);
173 PKCS7_free(p7);
174 return NULL;
175 }
176
177 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
178 BIO *indata, BIO *out, int flags)
179 {
180 STACK_OF(X509) *signers;
181 X509 *signer;
182 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
183 PKCS7_SIGNER_INFO *si;
184 X509_STORE_CTX cert_ctx;
185 char *buf = NULL;
186 int bufsiz;
187 int i, j = 0, k, ret = 0;
188 BIO *p7bio;
189 BIO *tmpin, *tmpout;
190
191 if (!p7) {
192 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
193 return 0;
194 }
195
196 if (!PKCS7_type_is_signed(p7)) {
197 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
198 return 0;
199 }
200
201 /* Check for no data and no content: no data to verify signature */
202 if (PKCS7_get_detached(p7) && !indata) {
203 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
204 return 0;
205 }
206 #if 0
207 /*
208 * NB: this test commented out because some versions of Netscape
209 * illegally include zero length content when signing data.
210 */
211
212 /* Check for data and content: two sets of data */
213 if (!PKCS7_get_detached(p7) && indata) {
214 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
215 return 0;
216 }
217 #endif
218
219 sinfos = PKCS7_get_signer_info(p7);
220
221 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
222 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
223 return 0;
224 }
225
226 signers = PKCS7_get0_signers(p7, certs, flags);
227
228 if (!signers)
229 return 0;
230
231 /* Now verify the certificates */
232
233 if (!(flags & PKCS7_NOVERIFY))
234 for (k = 0; k < sk_X509_num(signers); k++) {
235 signer = sk_X509_value(signers, k);
236 if (!(flags & PKCS7_NOCHAIN)) {
237 if (!X509_STORE_CTX_init(&cert_ctx, store, signer,
238 p7->d.sign->cert)) {
239 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
240 sk_X509_free(signers);
241 return 0;
242 }
243 X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
244 } else if (!X509_STORE_CTX_init(&cert_ctx, store, signer, NULL)) {
245 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
246 sk_X509_free(signers);
247 return 0;
248 }
249 if (!(flags & PKCS7_NOCRL))
250 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
251 i = X509_verify_cert(&cert_ctx);
252 if (i <= 0)
253 j = X509_STORE_CTX_get_error(&cert_ctx);
254 X509_STORE_CTX_cleanup(&cert_ctx);
255 if (i <= 0) {
256 PKCS7err(PKCS7_F_PKCS7_VERIFY,
257 PKCS7_R_CERTIFICATE_VERIFY_ERROR);
258 ERR_add_error_data(2, "Verify error:",
259 X509_verify_cert_error_string(j));
260 sk_X509_free(signers);
261 return 0;
262 }
263 /* Check for revocation status here */
264 }
265
266 /*
267 * Performance optimization: if the content is a memory BIO then store
268 * its contents in a temporary read only memory BIO. This avoids
269 * potentially large numbers of slow copies of data which will occur when
270 * reading from a read write memory BIO when signatures are calculated.
271 */
272
273 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
274 char *ptr;
275 long len;
276 len = BIO_get_mem_data(indata, &ptr);
277 tmpin = BIO_new_mem_buf(ptr, len);
278 if (tmpin == NULL) {
279 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
280 return 0;
281 }
282 } else
283 tmpin = indata;
284
285 if (!(p7bio = PKCS7_dataInit(p7, tmpin)))
286 goto err;
287
288 if (flags & PKCS7_TEXT) {
289 if (!(tmpout = BIO_new(BIO_s_mem()))) {
290 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
291 goto err;
292 }
293 BIO_set_mem_eof_return(tmpout, 0);
294 } else
295 tmpout = out;
296
297 bufsiz = 4096;
298 buf = OPENSSL_malloc (bufsiz);
299 if (buf == NULL) {
300 goto err;
301 }
302
303 /* We now have to 'read' from p7bio to calculate digests etc. */
304 for (;;) {
305 i = BIO_read(p7bio, buf, sizeof(buf));
306 if (i <= 0)
307 break;
308 if (tmpout)
309 BIO_write(tmpout, buf, i);
310 }
311
312 if (flags & PKCS7_TEXT) {
313 if (!SMIME_text(tmpout, out)) {
314 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SMIME_TEXT_ERROR);
315 BIO_free(tmpout);
316 goto err;
317 }
318 BIO_free(tmpout);
319 }
320
321 /* Now Verify All Signatures */
322 if (!(flags & PKCS7_NOSIGS))
323 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
324 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
325 signer = sk_X509_value(signers, i);
326 j = PKCS7_signatureVerify(p7bio, p7, si, signer);
327 if (j <= 0) {
328 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
329 goto err;
330 }
331 }
332
333 ret = 1;
334
335 err:
336
337 if (tmpin == indata) {
338 if (indata)
339 BIO_pop(p7bio);
340 }
341 BIO_free_all(p7bio);
342
343 sk_X509_free(signers);
344
345 if (buf != NULL) {
346 OPENSSL_free (buf);
347 }
348
349 return ret;
350 }
351
352 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
353 int flags)
354 {
355 STACK_OF(X509) *signers;
356 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
357 PKCS7_SIGNER_INFO *si;
358 PKCS7_ISSUER_AND_SERIAL *ias;
359 X509 *signer;
360 int i;
361
362 if (!p7) {
363 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
364 return NULL;
365 }
366
367 if (!PKCS7_type_is_signed(p7)) {
368 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
369 return NULL;
370 }
371
372 /* Collect all the signers together */
373
374 sinfos = PKCS7_get_signer_info(p7);
375
376 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
377 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
378 return NULL;
379 }
380
381 if (!(signers = sk_X509_new_null())) {
382 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
383 return NULL;
384 }
385
386 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
387 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
388 ias = si->issuer_and_serial;
389 signer = NULL;
390 /* If any certificates passed they take priority */
391 if (certs)
392 signer = X509_find_by_issuer_and_serial(certs,
393 ias->issuer, ias->serial);
394 if (!signer && !(flags & PKCS7_NOINTERN)
395 && p7->d.sign->cert)
396 signer =
397 X509_find_by_issuer_and_serial(p7->d.sign->cert,
398 ias->issuer, ias->serial);
399 if (!signer) {
400 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
401 PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
402 sk_X509_free(signers);
403 return NULL;
404 }
405
406 if (!sk_X509_push(signers, signer)) {
407 sk_X509_free(signers);
408 return NULL;
409 }
410 }
411 return signers;
412 }
413
414 /* Build a complete PKCS#7 enveloped data */
415
416 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
417 int flags)
418 {
419 PKCS7 *p7;
420 BIO *p7bio = NULL;
421 int i;
422 X509 *x509;
423 if (!(p7 = PKCS7_new())) {
424 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
425 return NULL;
426 }
427
428 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
429 goto err;
430 if (!PKCS7_set_cipher(p7, cipher)) {
431 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
432 goto err;
433 }
434
435 for (i = 0; i < sk_X509_num(certs); i++) {
436 x509 = sk_X509_value(certs, i);
437 if (!PKCS7_add_recipient(p7, x509)) {
438 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT);
439 goto err;
440 }
441 }
442
443 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
444 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
445 goto err;
446 }
447
448 SMIME_crlf_copy(in, p7bio, flags);
449
450 (void)BIO_flush(p7bio);
451
452 if (!PKCS7_dataFinal(p7, p7bio)) {
453 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_PKCS7_DATAFINAL_ERROR);
454 goto err;
455 }
456 BIO_free_all(p7bio);
457
458 return p7;
459
460 err:
461
462 BIO_free_all(p7bio);
463 PKCS7_free(p7);
464 return NULL;
465
466 }
467
468 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
469 {
470 BIO *tmpmem;
471 int ret, i;
472 char buf[4096];
473
474 if (!p7) {
475 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
476 return 0;
477 }
478
479 if (!PKCS7_type_is_enveloped(p7)) {
480 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
481 return 0;
482 }
483
484 if (cert && !X509_check_private_key(cert, pkey)) {
485 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
486 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
487 return 0;
488 }
489
490 if (!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
491 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
492 return 0;
493 }
494
495 if (flags & PKCS7_TEXT) {
496 BIO *tmpbuf, *bread;
497 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
498 if (!(tmpbuf = BIO_new(BIO_f_buffer()))) {
499 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
500 BIO_free_all(tmpmem);
501 return 0;
502 }
503 if (!(bread = BIO_push(tmpbuf, tmpmem))) {
504 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
505 BIO_free_all(tmpbuf);
506 BIO_free_all(tmpmem);
507 return 0;
508 }
509 ret = SMIME_text(bread, data);
510 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
511 if (!BIO_get_cipher_status(tmpmem))
512 ret = 0;
513 }
514 BIO_free_all(bread);
515 return ret;
516 } else {
517 for (;;) {
518 i = BIO_read(tmpmem, buf, sizeof(buf));
519 if (i <= 0) {
520 ret = 1;
521 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
522 if (!BIO_get_cipher_status(tmpmem))
523 ret = 0;
524 }
525
526 break;
527 }
528 if (BIO_write(data, buf, i) != i) {
529 ret = 0;
530 break;
531 }
532 }
533 BIO_free_all(tmpmem);
534 return ret;
535 }
536 }
537