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
PKCS7_sign(X509 * signcert,EVP_PKEY * pkey,STACK_OF (X509)* certs,BIO * data,int flags)66 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
67 BIO *data, int flags)
68 {
69 PKCS7 *p7;
70 PKCS7_SIGNER_INFO *si;
71 BIO *p7bio;
72 STACK_OF(X509_ALGOR) *smcap;
73 int i;
74
75 if(!X509_check_private_key(signcert, pkey)) {
76 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
77 return NULL;
78 }
79
80 if(!(p7 = PKCS7_new())) {
81 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
82 return NULL;
83 }
84
85 PKCS7_set_type(p7, NID_pkcs7_signed);
86
87 PKCS7_content_new(p7, NID_pkcs7_data);
88
89 if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
90 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
91 PKCS7_free(p7);
92 return NULL;
93 }
94
95 if(!(flags & PKCS7_NOCERTS)) {
96 PKCS7_add_certificate(p7, signcert);
97 if(certs) for(i = 0; i < sk_X509_num(certs); i++)
98 PKCS7_add_certificate(p7, sk_X509_value(certs, i));
99 }
100
101 if(!(flags & PKCS7_NOATTR)) {
102 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
103 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
104 /* Add SMIMECapabilities */
105 if(!(flags & PKCS7_NOSMIMECAP))
106 {
107 if(!(smcap = sk_X509_ALGOR_new_null())) {
108 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
109 PKCS7_free(p7);
110 return NULL;
111 }
112 #ifndef OPENSSL_NO_DES
113 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
114 #endif
115 #ifndef OPENSSL_NO_RC2
116 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
117 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
118 #endif
119 #ifndef OPENSSL_NO_DES
120 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
121 #endif
122 #ifndef OPENSSL_NO_RC2
123 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
124 #endif
125 PKCS7_add_attrib_smimecap (si, smcap);
126 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
127 }
128 }
129
130 if (flags & PKCS7_STREAM)
131 return p7;
132
133 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
134 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
135 PKCS7_free(p7);
136 return NULL;
137 }
138
139 SMIME_crlf_copy(data, p7bio, flags);
140
141 if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
142
143 if (!PKCS7_dataFinal(p7,p7bio)) {
144 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
145 PKCS7_free(p7);
146 BIO_free_all(p7bio);
147 return NULL;
148 }
149
150 BIO_free_all(p7bio);
151 return p7;
152 }
153
PKCS7_verify(PKCS7 * p7,STACK_OF (X509)* certs,X509_STORE * store,BIO * indata,BIO * out,int flags)154 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
155 BIO *indata, BIO *out, int flags)
156 {
157 STACK_OF(X509) *signers;
158 X509 *signer;
159 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
160 PKCS7_SIGNER_INFO *si;
161 X509_STORE_CTX cert_ctx;
162 char buf[4096];
163 int i, j=0, k, ret = 0;
164 BIO *p7bio;
165 BIO *tmpin, *tmpout;
166
167 if(!p7) {
168 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
169 return 0;
170 }
171
172 if(!PKCS7_type_is_signed(p7)) {
173 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
174 return 0;
175 }
176
177 /* Check for no data and no content: no data to verify signature */
178 if(PKCS7_get_detached(p7) && !indata) {
179 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
180 return 0;
181 }
182 #if 0
183 /* NB: this test commented out because some versions of Netscape
184 * illegally include zero length content when signing data.
185 */
186
187 /* Check for data and content: two sets of data */
188 if(!PKCS7_get_detached(p7) && indata) {
189 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
190 return 0;
191 }
192 #endif
193
194 sinfos = PKCS7_get_signer_info(p7);
195
196 if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
197 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
198 return 0;
199 }
200
201
202 signers = PKCS7_get0_signers(p7, certs, flags);
203
204 if(!signers) return 0;
205
206 /* Now verify the certificates */
207
208 if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
209 signer = sk_X509_value (signers, k);
210 if (!(flags & PKCS7_NOCHAIN)) {
211 if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
212 p7->d.sign->cert))
213 {
214 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
215 sk_X509_free(signers);
216 return 0;
217 }
218 X509_STORE_CTX_set_purpose(&cert_ctx,
219 X509_PURPOSE_SMIME_SIGN);
220 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
221 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
222 sk_X509_free(signers);
223 return 0;
224 }
225 if (!(flags & PKCS7_NOCRL))
226 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
227 i = X509_verify_cert(&cert_ctx);
228 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
229 X509_STORE_CTX_cleanup(&cert_ctx);
230 if (i <= 0) {
231 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
232 ERR_add_error_data(2, "Verify error:",
233 X509_verify_cert_error_string(j));
234 sk_X509_free(signers);
235 return 0;
236 }
237 /* Check for revocation status here */
238 }
239
240 /* Performance optimization: if the content is a memory BIO then
241 * store its contents in a temporary read only memory BIO. This
242 * avoids potentially large numbers of slow copies of data which will
243 * occur when reading from a read write memory BIO when signatures
244 * are calculated.
245 */
246
247 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
248 {
249 char *ptr;
250 long len;
251 len = BIO_get_mem_data(indata, &ptr);
252 tmpin = BIO_new_mem_buf(ptr, len);
253 if (tmpin == NULL)
254 {
255 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
256 return 0;
257 }
258 }
259 else
260 tmpin = indata;
261
262
263 p7bio=PKCS7_dataInit(p7,tmpin);
264
265 if(flags & PKCS7_TEXT) {
266 if(!(tmpout = BIO_new(BIO_s_mem()))) {
267 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
268 goto err;
269 }
270 } else tmpout = out;
271
272 /* We now have to 'read' from p7bio to calculate digests etc. */
273 for (;;)
274 {
275 i=BIO_read(p7bio,buf,sizeof(buf));
276 if (i <= 0) break;
277 if (tmpout) BIO_write(tmpout, buf, i);
278 }
279
280 if(flags & PKCS7_TEXT) {
281 if(!SMIME_text(tmpout, out)) {
282 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
283 BIO_free(tmpout);
284 goto err;
285 }
286 BIO_free(tmpout);
287 }
288
289 /* Now Verify All Signatures */
290 if (!(flags & PKCS7_NOSIGS))
291 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
292 {
293 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
294 signer = sk_X509_value (signers, i);
295 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
296 if (j <= 0) {
297 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
298 goto err;
299 }
300 }
301
302 ret = 1;
303
304 err:
305
306 if (tmpin == indata)
307 {
308 if (indata) BIO_pop(p7bio);
309 }
310 BIO_free_all(p7bio);
311
312 sk_X509_free(signers);
313
314 return ret;
315 }
316
STACK_OF(X509)317 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
318 {
319 STACK_OF(X509) *signers;
320 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
321 PKCS7_SIGNER_INFO *si;
322 PKCS7_ISSUER_AND_SERIAL *ias;
323 X509 *signer;
324 int i;
325
326 if(!p7) {
327 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
328 return NULL;
329 }
330
331 if(!PKCS7_type_is_signed(p7)) {
332 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
333 return NULL;
334 }
335
336 /* Collect all the signers together */
337
338 sinfos = PKCS7_get_signer_info(p7);
339
340 if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
341 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
342 return 0;
343 }
344
345 if(!(signers = sk_X509_new_null())) {
346 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
347 return NULL;
348 }
349
350 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
351 {
352 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
353 ias = si->issuer_and_serial;
354 signer = NULL;
355 /* If any certificates passed they take priority */
356 if (certs) signer = X509_find_by_issuer_and_serial (certs,
357 ias->issuer, ias->serial);
358 if (!signer && !(flags & PKCS7_NOINTERN)
359 && p7->d.sign->cert) signer =
360 X509_find_by_issuer_and_serial (p7->d.sign->cert,
361 ias->issuer, ias->serial);
362 if (!signer) {
363 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
364 sk_X509_free(signers);
365 return 0;
366 }
367
368 sk_X509_push(signers, signer);
369 }
370 return signers;
371 }
372
373
374 /* Build a complete PKCS#7 enveloped data */
375
PKCS7_encrypt(STACK_OF (X509)* certs,BIO * in,const EVP_CIPHER * cipher,int flags)376 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
377 int flags)
378 {
379 PKCS7 *p7;
380 BIO *p7bio = NULL;
381 int i;
382 X509 *x509;
383 if(!(p7 = PKCS7_new())) {
384 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
385 return NULL;
386 }
387
388 PKCS7_set_type(p7, NID_pkcs7_enveloped);
389 if(!PKCS7_set_cipher(p7, cipher)) {
390 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
391 goto err;
392 }
393
394 for(i = 0; i < sk_X509_num(certs); i++) {
395 x509 = sk_X509_value(certs, i);
396 if(!PKCS7_add_recipient(p7, x509)) {
397 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
398 PKCS7_R_ERROR_ADDING_RECIPIENT);
399 goto err;
400 }
401 }
402
403 if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
404 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
405 goto err;
406 }
407
408 SMIME_crlf_copy(in, p7bio, flags);
409
410 BIO_flush(p7bio);
411
412 if (!PKCS7_dataFinal(p7,p7bio)) {
413 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
414 goto err;
415 }
416 BIO_free_all(p7bio);
417
418 return p7;
419
420 err:
421
422 BIO_free(p7bio);
423 PKCS7_free(p7);
424 return NULL;
425
426 }
427
PKCS7_decrypt(PKCS7 * p7,EVP_PKEY * pkey,X509 * cert,BIO * data,int flags)428 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
429 {
430 BIO *tmpmem;
431 int ret, i;
432 char buf[4096];
433
434 if(!p7) {
435 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
436 return 0;
437 }
438
439 if(!PKCS7_type_is_enveloped(p7)) {
440 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
441 return 0;
442 }
443
444 if(cert && !X509_check_private_key(cert, pkey)) {
445 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
446 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
447 return 0;
448 }
449
450 if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
451 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
452 return 0;
453 }
454
455 if (flags & PKCS7_TEXT) {
456 BIO *tmpbuf, *bread;
457 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
458 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
459 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
460 return 0;
461 }
462 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
463 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
464 return 0;
465 }
466 ret = SMIME_text(bread, data);
467 BIO_free_all(bread);
468 return ret;
469 } else {
470 for(;;) {
471 i = BIO_read(tmpmem, buf, sizeof(buf));
472 if(i <= 0) break;
473 BIO_write(data, buf, i);
474 }
475 BIO_free_all(tmpmem);
476 return 1;
477 }
478 }
479