1 /* crypto/pkcs7/pk7_doit.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65 #include <openssl/err.h>
66
67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
68 void *value);
69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
70
PKCS7_type_is_other(PKCS7 * p7)71 static int PKCS7_type_is_other(PKCS7* p7)
72 {
73 int isOther=1;
74
75 int nid=OBJ_obj2nid(p7->type);
76
77 switch( nid )
78 {
79 case NID_pkcs7_data:
80 case NID_pkcs7_signed:
81 case NID_pkcs7_enveloped:
82 case NID_pkcs7_signedAndEnveloped:
83 case NID_pkcs7_digest:
84 case NID_pkcs7_encrypted:
85 isOther=0;
86 break;
87 default:
88 isOther=1;
89 }
90
91 return isOther;
92
93 }
94
PKCS7_get_octet_string(PKCS7 * p7)95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
96 {
97 if ( PKCS7_type_is_data(p7))
98 return p7->d.data;
99 if ( PKCS7_type_is_other(p7) && p7->d.other
100 && (p7->d.other->type == V_ASN1_OCTET_STRING))
101 return p7->d.other->value.octet_string;
102 return NULL;
103 }
104
PKCS7_bio_add_digest(BIO ** pbio,X509_ALGOR * alg)105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
106 {
107 BIO *btmp;
108 const EVP_MD *md;
109 if ((btmp=BIO_new(BIO_f_md())) == NULL)
110 {
111 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
112 goto err;
113 }
114
115 md=EVP_get_digestbyobj(alg->algorithm);
116 if (md == NULL)
117 {
118 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
119 goto err;
120 }
121
122 BIO_set_md(btmp,md);
123 if (*pbio == NULL)
124 *pbio=btmp;
125 else if (!BIO_push(*pbio,btmp))
126 {
127 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
128 goto err;
129 }
130 btmp=NULL;
131
132 return 1;
133
134 err:
135 if (btmp)
136 BIO_free(btmp);
137 return 0;
138
139 }
140
PKCS7_dataInit(PKCS7 * p7,BIO * bio)141 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
142 {
143 int i;
144 BIO *out=NULL,*btmp=NULL;
145 X509_ALGOR *xa = NULL;
146 const EVP_CIPHER *evp_cipher=NULL;
147 STACK_OF(X509_ALGOR) *md_sk=NULL;
148 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
149 X509_ALGOR *xalg=NULL;
150 PKCS7_RECIP_INFO *ri=NULL;
151 EVP_PKEY *pkey;
152 ASN1_OCTET_STRING *os=NULL;
153
154 i=OBJ_obj2nid(p7->type);
155 p7->state=PKCS7_S_HEADER;
156
157 switch (i)
158 {
159 case NID_pkcs7_signed:
160 md_sk=p7->d.sign->md_algs;
161 os = PKCS7_get_octet_string(p7->d.sign->contents);
162 break;
163 case NID_pkcs7_signedAndEnveloped:
164 rsk=p7->d.signed_and_enveloped->recipientinfo;
165 md_sk=p7->d.signed_and_enveloped->md_algs;
166 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
167 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
168 if (evp_cipher == NULL)
169 {
170 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
171 PKCS7_R_CIPHER_NOT_INITIALIZED);
172 goto err;
173 }
174 break;
175 case NID_pkcs7_enveloped:
176 rsk=p7->d.enveloped->recipientinfo;
177 xalg=p7->d.enveloped->enc_data->algorithm;
178 evp_cipher=p7->d.enveloped->enc_data->cipher;
179 if (evp_cipher == NULL)
180 {
181 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
182 PKCS7_R_CIPHER_NOT_INITIALIZED);
183 goto err;
184 }
185 break;
186 case NID_pkcs7_digest:
187 xa = p7->d.digest->md;
188 os = PKCS7_get_octet_string(p7->d.digest->contents);
189 break;
190 default:
191 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
192 goto err;
193 }
194
195 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
196 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
197 goto err;
198
199 if (xa && !PKCS7_bio_add_digest(&out, xa))
200 goto err;
201
202 if (evp_cipher != NULL)
203 {
204 unsigned char key[EVP_MAX_KEY_LENGTH];
205 unsigned char iv[EVP_MAX_IV_LENGTH];
206 int keylen,ivlen;
207 int jj,max;
208 unsigned char *tmp;
209 EVP_CIPHER_CTX *ctx;
210
211 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
212 {
213 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
214 goto err;
215 }
216 BIO_get_cipher_ctx(btmp, &ctx);
217 keylen=EVP_CIPHER_key_length(evp_cipher);
218 ivlen=EVP_CIPHER_iv_length(evp_cipher);
219 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
220 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
221 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
222 goto err;
223 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
224 goto err;
225 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
226 goto err;
227
228 if (ivlen > 0) {
229 if (xalg->parameter == NULL)
230 xalg->parameter=ASN1_TYPE_new();
231 if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
232 goto err;
233 }
234
235 /* Lets do the pub key stuff :-) */
236 max=0;
237 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
238 {
239 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
240 if (ri->cert == NULL)
241 {
242 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
243 goto err;
244 }
245 pkey=X509_get_pubkey(ri->cert);
246 jj=EVP_PKEY_size(pkey);
247 EVP_PKEY_free(pkey);
248 if (max < jj) max=jj;
249 }
250 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
251 {
252 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
253 goto err;
254 }
255 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
256 {
257 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
258 pkey=X509_get_pubkey(ri->cert);
259 jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
260 EVP_PKEY_free(pkey);
261 if (jj <= 0)
262 {
263 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
264 OPENSSL_free(tmp);
265 goto err;
266 }
267 if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj))
268 {
269 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
270 ERR_R_MALLOC_FAILURE);
271 OPENSSL_free(tmp);
272 goto err;
273 }
274 }
275 OPENSSL_free(tmp);
276 OPENSSL_cleanse(key, keylen);
277
278 if (out == NULL)
279 out=btmp;
280 else
281 BIO_push(out,btmp);
282 btmp=NULL;
283 }
284
285 if (bio == NULL)
286 {
287 if (PKCS7_is_detached(p7))
288 bio=BIO_new(BIO_s_null());
289 else if (os && os->length > 0)
290 bio = BIO_new_mem_buf(os->data, os->length);
291 if(bio == NULL)
292 {
293 bio=BIO_new(BIO_s_mem());
294 BIO_set_mem_eof_return(bio,0);
295 }
296 }
297 BIO_push(out,bio);
298 bio=NULL;
299 if (0)
300 {
301 err:
302 if (out != NULL)
303 BIO_free_all(out);
304 if (btmp != NULL)
305 BIO_free_all(btmp);
306 out=NULL;
307 }
308 return(out);
309 }
310
pkcs7_cmp_ri(PKCS7_RECIP_INFO * ri,X509 * pcert)311 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
312 {
313 int ret;
314 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
315 pcert->cert_info->issuer);
316 if (ret)
317 return ret;
318 return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
319 ri->issuer_and_serial->serial);
320 }
321
322 /* int */
PKCS7_dataDecode(PKCS7 * p7,EVP_PKEY * pkey,BIO * in_bio,X509 * pcert)323 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
324 {
325 int i,j;
326 BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
327 unsigned char *tmp=NULL;
328 X509_ALGOR *xa;
329 ASN1_OCTET_STRING *data_body=NULL;
330 const EVP_MD *evp_md;
331 const EVP_CIPHER *evp_cipher=NULL;
332 EVP_CIPHER_CTX *evp_ctx=NULL;
333 X509_ALGOR *enc_alg=NULL;
334 STACK_OF(X509_ALGOR) *md_sk=NULL;
335 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
336 X509_ALGOR *xalg=NULL;
337 PKCS7_RECIP_INFO *ri=NULL;
338
339 i=OBJ_obj2nid(p7->type);
340 p7->state=PKCS7_S_HEADER;
341
342 switch (i)
343 {
344 case NID_pkcs7_signed:
345 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
346 md_sk=p7->d.sign->md_algs;
347 break;
348 case NID_pkcs7_signedAndEnveloped:
349 rsk=p7->d.signed_and_enveloped->recipientinfo;
350 md_sk=p7->d.signed_and_enveloped->md_algs;
351 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
352 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
353 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
354 if (evp_cipher == NULL)
355 {
356 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
357 goto err;
358 }
359 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
360 break;
361 case NID_pkcs7_enveloped:
362 rsk=p7->d.enveloped->recipientinfo;
363 enc_alg=p7->d.enveloped->enc_data->algorithm;
364 data_body=p7->d.enveloped->enc_data->enc_data;
365 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
366 if (evp_cipher == NULL)
367 {
368 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
369 goto err;
370 }
371 xalg=p7->d.enveloped->enc_data->algorithm;
372 break;
373 default:
374 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
375 goto err;
376 }
377
378 /* We will be checking the signature */
379 if (md_sk != NULL)
380 {
381 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
382 {
383 xa=sk_X509_ALGOR_value(md_sk,i);
384 if ((btmp=BIO_new(BIO_f_md())) == NULL)
385 {
386 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
387 goto err;
388 }
389
390 j=OBJ_obj2nid(xa->algorithm);
391 evp_md=EVP_get_digestbynid(j);
392 if (evp_md == NULL)
393 {
394 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
395 goto err;
396 }
397
398 BIO_set_md(btmp,evp_md);
399 if (out == NULL)
400 out=btmp;
401 else
402 BIO_push(out,btmp);
403 btmp=NULL;
404 }
405 }
406
407 if (evp_cipher != NULL)
408 {
409 #if 0
410 unsigned char key[EVP_MAX_KEY_LENGTH];
411 unsigned char iv[EVP_MAX_IV_LENGTH];
412 unsigned char *p;
413 int keylen,ivlen;
414 int max;
415 X509_OBJECT ret;
416 #endif
417 int jj;
418
419 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
420 {
421 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
422 goto err;
423 }
424
425 /* It was encrypted, we need to decrypt the secret key
426 * with the private key */
427
428 /* Find the recipientInfo which matches the passed certificate
429 * (if any)
430 */
431
432 if (pcert) {
433 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
434 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
435 if (!pkcs7_cmp_ri(ri, pcert))
436 break;
437 ri=NULL;
438 }
439 if (ri == NULL) {
440 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
441 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
442 goto err;
443 }
444 }
445
446 jj=EVP_PKEY_size(pkey);
447 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
448 if (tmp == NULL)
449 {
450 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
451 goto err;
452 }
453
454 /* If we haven't got a certificate try each ri in turn */
455
456 if (pcert == NULL)
457 {
458 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
459 {
460 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
461 jj=EVP_PKEY_decrypt(tmp,
462 M_ASN1_STRING_data(ri->enc_key),
463 M_ASN1_STRING_length(ri->enc_key),
464 pkey);
465 if (jj > 0)
466 break;
467 ERR_clear_error();
468 ri = NULL;
469 }
470 if (ri == NULL)
471 {
472 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
473 PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
474 goto err;
475 }
476 }
477 else
478 {
479 jj=EVP_PKEY_decrypt(tmp,
480 M_ASN1_STRING_data(ri->enc_key),
481 M_ASN1_STRING_length(ri->enc_key), pkey);
482 if (jj <= 0)
483 {
484 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
485 ERR_R_EVP_LIB);
486 goto err;
487 }
488 }
489
490 evp_ctx=NULL;
491 BIO_get_cipher_ctx(etmp,&evp_ctx);
492 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
493 goto err;
494 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
495 goto err;
496
497 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
498 /* Some S/MIME clients don't use the same key
499 * and effective key length. The key length is
500 * determined by the size of the decrypted RSA key.
501 */
502 if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
503 {
504 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
505 PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
506 goto err;
507 }
508 }
509 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
510 goto err;
511
512 OPENSSL_cleanse(tmp,jj);
513
514 if (out == NULL)
515 out=etmp;
516 else
517 BIO_push(out,etmp);
518 etmp=NULL;
519 }
520
521 #if 1
522 if (PKCS7_is_detached(p7) || (in_bio != NULL))
523 {
524 bio=in_bio;
525 }
526 else
527 {
528 #if 0
529 bio=BIO_new(BIO_s_mem());
530 /* We need to set this so that when we have read all
531 * the data, the encrypt BIO, if present, will read
532 * EOF and encode the last few bytes */
533 BIO_set_mem_eof_return(bio,0);
534
535 if (data_body->length > 0)
536 BIO_write(bio,(char *)data_body->data,data_body->length);
537 #else
538 if (data_body->length > 0)
539 bio = BIO_new_mem_buf(data_body->data,data_body->length);
540 else {
541 bio=BIO_new(BIO_s_mem());
542 BIO_set_mem_eof_return(bio,0);
543 }
544 #endif
545 }
546 BIO_push(out,bio);
547 bio=NULL;
548 #endif
549 if (0)
550 {
551 err:
552 if (out != NULL) BIO_free_all(out);
553 if (btmp != NULL) BIO_free_all(btmp);
554 if (etmp != NULL) BIO_free_all(etmp);
555 if (bio != NULL) BIO_free_all(bio);
556 out=NULL;
557 }
558 if (tmp != NULL)
559 OPENSSL_free(tmp);
560 return(out);
561 }
562
PKCS7_find_digest(EVP_MD_CTX ** pmd,BIO * bio,int nid)563 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
564 {
565 for (;;)
566 {
567 bio=BIO_find_type(bio,BIO_TYPE_MD);
568 if (bio == NULL)
569 {
570 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
571 return NULL;
572 }
573 BIO_get_md_ctx(bio,pmd);
574 if (*pmd == NULL)
575 {
576 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
577 return NULL;
578 }
579 if (EVP_MD_CTX_type(*pmd) == nid)
580 return bio;
581 bio=BIO_next(bio);
582 }
583 return NULL;
584 }
585
PKCS7_dataFinal(PKCS7 * p7,BIO * bio)586 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
587 {
588 int ret=0;
589 int i,j;
590 BIO *btmp;
591 BUF_MEM *buf_mem=NULL;
592 BUF_MEM *buf=NULL;
593 PKCS7_SIGNER_INFO *si;
594 EVP_MD_CTX *mdc,ctx_tmp;
595 STACK_OF(X509_ATTRIBUTE) *sk;
596 STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
597 ASN1_OCTET_STRING *os=NULL;
598
599 EVP_MD_CTX_init(&ctx_tmp);
600 i=OBJ_obj2nid(p7->type);
601 p7->state=PKCS7_S_HEADER;
602
603 switch (i)
604 {
605 case NID_pkcs7_signedAndEnveloped:
606 /* XXXXXXXXXXXXXXXX */
607 si_sk=p7->d.signed_and_enveloped->signer_info;
608 if (!(os=M_ASN1_OCTET_STRING_new()))
609 {
610 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
611 goto err;
612 }
613 p7->d.signed_and_enveloped->enc_data->enc_data=os;
614 break;
615 case NID_pkcs7_enveloped:
616 /* XXXXXXXXXXXXXXXX */
617 if (!(os=M_ASN1_OCTET_STRING_new()))
618 {
619 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
620 goto err;
621 }
622 p7->d.enveloped->enc_data->enc_data=os;
623 break;
624 case NID_pkcs7_signed:
625 si_sk=p7->d.sign->signer_info;
626 os=PKCS7_get_octet_string(p7->d.sign->contents);
627 /* If detached data then the content is excluded */
628 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
629 M_ASN1_OCTET_STRING_free(os);
630 p7->d.sign->contents->d.data = NULL;
631 }
632 break;
633
634 case NID_pkcs7_digest:
635 os=PKCS7_get_octet_string(p7->d.digest->contents);
636 /* If detached data then the content is excluded */
637 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
638 {
639 M_ASN1_OCTET_STRING_free(os);
640 p7->d.digest->contents->d.data = NULL;
641 }
642 break;
643
644 }
645
646 if (si_sk != NULL)
647 {
648 if ((buf=BUF_MEM_new()) == NULL)
649 {
650 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
651 goto err;
652 }
653 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
654 {
655 si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
656 if (si->pkey == NULL) continue;
657
658 j=OBJ_obj2nid(si->digest_alg->algorithm);
659
660 btmp=bio;
661
662 btmp = PKCS7_find_digest(&mdc, btmp, j);
663
664 if (btmp == NULL)
665 goto err;
666
667 /* We now have the EVP_MD_CTX, lets do the
668 * signing. */
669 EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
670 if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
671 {
672 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
673 goto err;
674 }
675
676 sk=si->auth_attr;
677
678 /* If there are attributes, we add the digest
679 * attribute and only sign the attributes */
680 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
681 {
682 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
683 unsigned int md_len, alen;
684 ASN1_OCTET_STRING *digest;
685 ASN1_UTCTIME *sign_time;
686 const EVP_MD *md_tmp;
687
688 /* Add signing time if not already present */
689 if (!PKCS7_get_signed_attribute(si,
690 NID_pkcs9_signingTime))
691 {
692 if (!(sign_time=X509_gmtime_adj(NULL,0)))
693 {
694 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
695 ERR_R_MALLOC_FAILURE);
696 goto err;
697 }
698 PKCS7_add_signed_attribute(si,
699 NID_pkcs9_signingTime,
700 V_ASN1_UTCTIME,sign_time);
701 }
702
703 /* Add digest */
704 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
705 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
706 if (!(digest=M_ASN1_OCTET_STRING_new()))
707 {
708 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
709 ERR_R_MALLOC_FAILURE);
710 goto err;
711 }
712 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
713 md_len))
714 {
715 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
716 ERR_R_MALLOC_FAILURE);
717 goto err;
718 }
719 PKCS7_add_signed_attribute(si,
720 NID_pkcs9_messageDigest,
721 V_ASN1_OCTET_STRING,digest);
722
723 /* Now sign the attributes */
724 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
725 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
726 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
727 if(!abuf) goto err;
728 EVP_SignUpdate(&ctx_tmp,abuf,alen);
729 OPENSSL_free(abuf);
730 }
731
732 #ifndef OPENSSL_NO_DSA
733 if (si->pkey->type == EVP_PKEY_DSA)
734 ctx_tmp.digest=EVP_dss1();
735 #endif
736 #ifndef OPENSSL_NO_ECDSA
737 if (si->pkey->type == EVP_PKEY_EC)
738 ctx_tmp.digest=EVP_ecdsa();
739 #endif
740
741 if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
742 (unsigned int *)&buf->length,si->pkey))
743 {
744 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
745 goto err;
746 }
747 if (!ASN1_STRING_set(si->enc_digest,
748 (unsigned char *)buf->data,buf->length))
749 {
750 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
751 goto err;
752 }
753 }
754 }
755 else if (i == NID_pkcs7_digest)
756 {
757 unsigned char md_data[EVP_MAX_MD_SIZE];
758 unsigned int md_len;
759 if (!PKCS7_find_digest(&mdc, bio,
760 OBJ_obj2nid(p7->d.digest->md->algorithm)))
761 goto err;
762 EVP_DigestFinal_ex(mdc,md_data,&md_len);
763 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
764 }
765
766 if (!PKCS7_is_detached(p7))
767 {
768 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
769 if (btmp == NULL)
770 {
771 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
772 goto err;
773 }
774 BIO_get_mem_ptr(btmp,&buf_mem);
775 /* Mark the BIO read only then we can use its copy of the data
776 * instead of making an extra copy.
777 */
778 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
779 BIO_set_mem_eof_return(btmp, 0);
780 os->data = (unsigned char *)buf_mem->data;
781 os->length = buf_mem->length;
782 #if 0
783 M_ASN1_OCTET_STRING_set(os,
784 (unsigned char *)buf_mem->data,buf_mem->length);
785 #endif
786 }
787 ret=1;
788 err:
789 EVP_MD_CTX_cleanup(&ctx_tmp);
790 if (buf != NULL) BUF_MEM_free(buf);
791 return(ret);
792 }
793
PKCS7_dataVerify(X509_STORE * cert_store,X509_STORE_CTX * ctx,BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si)794 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
795 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
796 {
797 PKCS7_ISSUER_AND_SERIAL *ias;
798 int ret=0,i;
799 STACK_OF(X509) *cert;
800 X509 *x509;
801
802 if (PKCS7_type_is_signed(p7))
803 {
804 cert=p7->d.sign->cert;
805 }
806 else if (PKCS7_type_is_signedAndEnveloped(p7))
807 {
808 cert=p7->d.signed_and_enveloped->cert;
809 }
810 else
811 {
812 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
813 goto err;
814 }
815 /* XXXXXXXXXXXXXXXXXXXXXXX */
816 ias=si->issuer_and_serial;
817
818 x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
819
820 /* were we able to find the cert in passed to us */
821 if (x509 == NULL)
822 {
823 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
824 goto err;
825 }
826
827 /* Lets verify */
828 if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
829 {
830 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
831 goto err;
832 }
833 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
834 i=X509_verify_cert(ctx);
835 if (i <= 0)
836 {
837 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
838 X509_STORE_CTX_cleanup(ctx);
839 goto err;
840 }
841 X509_STORE_CTX_cleanup(ctx);
842
843 return PKCS7_signatureVerify(bio, p7, si, x509);
844 err:
845 return ret;
846 }
847
PKCS7_signatureVerify(BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si,X509 * x509)848 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
849 X509 *x509)
850 {
851 ASN1_OCTET_STRING *os;
852 EVP_MD_CTX mdc_tmp,*mdc;
853 int ret=0,i;
854 int md_type;
855 STACK_OF(X509_ATTRIBUTE) *sk;
856 BIO *btmp;
857 EVP_PKEY *pkey;
858
859 EVP_MD_CTX_init(&mdc_tmp);
860
861 if (!PKCS7_type_is_signed(p7) &&
862 !PKCS7_type_is_signedAndEnveloped(p7)) {
863 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
864 PKCS7_R_WRONG_PKCS7_TYPE);
865 goto err;
866 }
867
868 md_type=OBJ_obj2nid(si->digest_alg->algorithm);
869
870 btmp=bio;
871 for (;;)
872 {
873 if ((btmp == NULL) ||
874 ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
875 {
876 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
877 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
878 goto err;
879 }
880 BIO_get_md_ctx(btmp,&mdc);
881 if (mdc == NULL)
882 {
883 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
884 ERR_R_INTERNAL_ERROR);
885 goto err;
886 }
887 if (EVP_MD_CTX_type(mdc) == md_type)
888 break;
889 /* Workaround for some broken clients that put the signature
890 * OID instead of the digest OID in digest_alg->algorithm
891 */
892 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
893 break;
894 btmp=BIO_next(btmp);
895 }
896
897 /* mdc is the digest ctx that we want, unless there are attributes,
898 * in which case the digest is the signed attributes */
899 EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
900
901 sk=si->auth_attr;
902 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
903 {
904 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
905 unsigned int md_len, alen;
906 ASN1_OCTET_STRING *message_digest;
907
908 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
909 message_digest=PKCS7_digest_from_attributes(sk);
910 if (!message_digest)
911 {
912 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
913 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
914 goto err;
915 }
916 if ((message_digest->length != (int)md_len) ||
917 (memcmp(message_digest->data,md_dat,md_len)))
918 {
919 #if 0
920 {
921 int ii;
922 for (ii=0; ii<message_digest->length; ii++)
923 printf("%02X",message_digest->data[ii]); printf(" sent\n");
924 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
925 }
926 #endif
927 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
928 PKCS7_R_DIGEST_FAILURE);
929 ret= -1;
930 goto err;
931 }
932
933 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
934
935 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
936 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
937 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
938
939 OPENSSL_free(abuf);
940 }
941
942 os=si->enc_digest;
943 pkey = X509_get_pubkey(x509);
944 if (!pkey)
945 {
946 ret = -1;
947 goto err;
948 }
949 #ifndef OPENSSL_NO_DSA
950 if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
951 #endif
952 #ifndef OPENSSL_NO_ECDSA
953 if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
954 #endif
955
956 i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
957 EVP_PKEY_free(pkey);
958 if (i <= 0)
959 {
960 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
961 PKCS7_R_SIGNATURE_FAILURE);
962 ret= -1;
963 goto err;
964 }
965 else
966 ret=1;
967 err:
968 EVP_MD_CTX_cleanup(&mdc_tmp);
969 return(ret);
970 }
971
PKCS7_get_issuer_and_serial(PKCS7 * p7,int idx)972 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
973 {
974 STACK_OF(PKCS7_RECIP_INFO) *rsk;
975 PKCS7_RECIP_INFO *ri;
976 int i;
977
978 i=OBJ_obj2nid(p7->type);
979 if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
980 rsk=p7->d.signed_and_enveloped->recipientinfo;
981 ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
982 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
983 ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
984 return(ri->issuer_and_serial);
985 }
986
PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO * si,int nid)987 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
988 {
989 return(get_attribute(si->auth_attr,nid));
990 }
991
PKCS7_get_attribute(PKCS7_SIGNER_INFO * si,int nid)992 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
993 {
994 return(get_attribute(si->unauth_attr,nid));
995 }
996
get_attribute(STACK_OF (X509_ATTRIBUTE)* sk,int nid)997 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
998 {
999 int i;
1000 X509_ATTRIBUTE *xa;
1001 ASN1_OBJECT *o;
1002
1003 o=OBJ_nid2obj(nid);
1004 if (!o || !sk) return(NULL);
1005 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1006 {
1007 xa=sk_X509_ATTRIBUTE_value(sk,i);
1008 if (OBJ_cmp(xa->object,o) == 0)
1009 {
1010 if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1011 return(sk_ASN1_TYPE_value(xa->value.set,0));
1012 else
1013 return(NULL);
1014 }
1015 }
1016 return(NULL);
1017 }
1018
PKCS7_digest_from_attributes(STACK_OF (X509_ATTRIBUTE)* sk)1019 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1020 {
1021 ASN1_TYPE *astype;
1022 if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1023 return astype->value.octet_string;
1024 }
1025
PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1026 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1027 STACK_OF(X509_ATTRIBUTE) *sk)
1028 {
1029 int i;
1030
1031 if (p7si->auth_attr != NULL)
1032 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1033 p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1034 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1035 {
1036 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1037 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1038 == NULL)
1039 return(0);
1040 }
1041 return(1);
1042 }
1043
PKCS7_set_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1044 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1045 {
1046 int i;
1047
1048 if (p7si->unauth_attr != NULL)
1049 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1050 X509_ATTRIBUTE_free);
1051 p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1052 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1053 {
1054 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1055 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1056 == NULL)
1057 return(0);
1058 }
1059 return(1);
1060 }
1061
PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1062 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1063 void *value)
1064 {
1065 return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1066 }
1067
PKCS7_add_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1068 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1069 void *value)
1070 {
1071 return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1072 }
1073
add_attribute(STACK_OF (X509_ATTRIBUTE)** sk,int nid,int atrtype,void * value)1074 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1075 void *value)
1076 {
1077 X509_ATTRIBUTE *attr=NULL;
1078
1079 if (*sk == NULL)
1080 {
1081 *sk = sk_X509_ATTRIBUTE_new_null();
1082 new_attrib:
1083 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1084 sk_X509_ATTRIBUTE_push(*sk,attr);
1085 }
1086 else
1087 {
1088 int i;
1089
1090 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1091 {
1092 attr=sk_X509_ATTRIBUTE_value(*sk,i);
1093 if (OBJ_obj2nid(attr->object) == nid)
1094 {
1095 X509_ATTRIBUTE_free(attr);
1096 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1097 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1098 goto end;
1099 }
1100 }
1101 goto new_attrib;
1102 }
1103 end:
1104 return(1);
1105 }
1106
1107