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Fix some obvious bugs in the PKCS#7 library handling. It didn't try to
[thirdparty/openssl.git] / crypto / pkcs7 / pk7_doit.c
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
65 static int add_attribute(STACK **sk, int nid, int atrtype, void *value);
66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
67
68 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
69 {
70 int i,j;
71 BIO *out=NULL,*btmp=NULL;
72 X509_ALGOR *xa;
73 const EVP_MD *evp_md;
74 const EVP_CIPHER *evp_cipher=NULL;
75 STACK *md_sk=NULL,*rsk=NULL;
76 X509_ALGOR *xalg=NULL;
77 PKCS7_RECIP_INFO *ri=NULL;
78 EVP_PKEY *pkey;
79
80 i=OBJ_obj2nid(p7->type);
81 p7->state=PKCS7_S_HEADER;
82
83 switch (i)
84 {
85 case NID_pkcs7_signed:
86 md_sk=p7->d.sign->md_algs;
87 break;
88 case NID_pkcs7_signedAndEnveloped:
89 rsk=p7->d.signed_and_enveloped->recipientinfo;
90 md_sk=p7->d.signed_and_enveloped->md_algs;
91 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
92 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
93 if (evp_cipher == NULL)
94 {
95 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
96 PKCS7_R_CIPHER_NOT_INITIALIZED);
97 goto err;
98 }
99 break;
100 case NID_pkcs7_enveloped:
101 rsk=p7->d.enveloped->recipientinfo;
102 xalg=p7->d.enveloped->enc_data->algorithm;
103 evp_cipher=p7->d.enveloped->enc_data->cipher;
104 if (evp_cipher == NULL)
105 {
106 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
107 PKCS7_R_CIPHER_NOT_INITIALIZED);
108 goto err;
109 }
110 break;
111 default:
112 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
113 goto err;
114 }
115
116 if (md_sk != NULL)
117 {
118 for (i=0; i<sk_num(md_sk); i++)
119 {
120 xa=(X509_ALGOR *)sk_value(md_sk,i);
121 if ((btmp=BIO_new(BIO_f_md())) == NULL)
122 {
123 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
124 goto err;
125 }
126
127 j=OBJ_obj2nid(xa->algorithm);
128 evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
129 if (evp_md == NULL)
130 {
131 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
132 goto err;
133 }
134
135 BIO_set_md(btmp,evp_md);
136 if (out == NULL)
137 out=btmp;
138 else
139 BIO_push(out,btmp);
140 btmp=NULL;
141 }
142 }
143
144 if (evp_cipher != NULL)
145 {
146 unsigned char key[EVP_MAX_KEY_LENGTH];
147 unsigned char iv[EVP_MAX_IV_LENGTH];
148 int keylen,ivlen;
149 int jj,max;
150 unsigned char *tmp;
151 EVP_CIPHER_CTX *ctx;
152
153 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
154 {
155 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
156 goto err;
157 }
158 BIO_get_cipher_ctx(btmp, &ctx);
159 keylen=EVP_CIPHER_key_length(evp_cipher);
160 ivlen=EVP_CIPHER_iv_length(evp_cipher);
161 RAND_bytes(key,keylen);
162 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
163 memset(key, 0, keylen);
164 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
165
166 if (ivlen > 0) {
167 RAND_bytes(iv,ivlen);
168 if (xalg->parameter == NULL)
169 xalg->parameter=ASN1_TYPE_new();
170 if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
171 goto err;
172 }
173
174 /* Lets do the pub key stuff :-) */
175 max=0;
176 for (i=0; i<sk_num(rsk); i++)
177 {
178 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
179 if (ri->cert == NULL)
180 {
181 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
182 goto err;
183 }
184 pkey=X509_get_pubkey(ri->cert);
185 jj=EVP_PKEY_size(pkey);
186 EVP_PKEY_free(pkey);
187 if (max < jj) max=jj;
188 }
189 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
190 {
191 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
192 goto err;
193 }
194 for (i=0; i<sk_num(rsk); i++)
195 {
196 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
197 pkey=X509_get_pubkey(ri->cert);
198 jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
199 EVP_PKEY_free(pkey);
200 if (jj <= 0)
201 {
202 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
203 Free(tmp);
204 goto err;
205 }
206 ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
207 }
208 Free(tmp);
209
210 if (out == NULL)
211 out=btmp;
212 else
213 BIO_push(out,btmp);
214 btmp=NULL;
215 }
216
217 if (bio == NULL) /* ??????????? */
218 {
219 if (p7->detached)
220 bio=BIO_new(BIO_s_null());
221 else
222 {
223 bio=BIO_new(BIO_s_mem());
224 /* We need to set this so that when we have read all
225 * the data, the encrypt BIO, if present, will read
226 * EOF and encode the last few bytes */
227 BIO_set_mem_eof_return(bio,0);
228
229 if (PKCS7_type_is_signed(p7) &&
230 PKCS7_type_is_data(p7->d.sign->contents))
231 {
232 ASN1_OCTET_STRING *os;
233
234 os=p7->d.sign->contents->d.data;
235 if (os->length > 0)
236 BIO_write(bio,(char *)os->data,
237 os->length);
238 }
239 }
240 }
241 BIO_push(out,bio);
242 bio=NULL;
243 if (0)
244 {
245 err:
246 if (out != NULL)
247 BIO_free_all(out);
248 if (btmp != NULL)
249 BIO_free_all(btmp);
250 out=NULL;
251 }
252 return(out);
253 }
254
255 /* int */
256 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
257 {
258 int i,j;
259 BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
260 char *tmp=NULL;
261 X509_ALGOR *xa;
262 ASN1_OCTET_STRING *data_body=NULL;
263 const EVP_MD *evp_md;
264 const EVP_CIPHER *evp_cipher=NULL;
265 EVP_CIPHER_CTX *evp_ctx=NULL;
266 X509_ALGOR *enc_alg=NULL;
267 STACK *md_sk=NULL,*rsk=NULL;
268 X509_ALGOR *xalg=NULL;
269 PKCS7_RECIP_INFO *ri=NULL;
270 /* EVP_PKEY *pkey; */
271 #if 0
272 X509_STORE_CTX s_ctx;
273 #endif
274
275 i=OBJ_obj2nid(p7->type);
276 p7->state=PKCS7_S_HEADER;
277
278 switch (i)
279 {
280 case NID_pkcs7_signed:
281 data_body=p7->d.sign->contents->d.data;
282 md_sk=p7->d.sign->md_algs;
283 break;
284 case NID_pkcs7_signedAndEnveloped:
285 rsk=p7->d.signed_and_enveloped->recipientinfo;
286 md_sk=p7->d.signed_and_enveloped->md_algs;
287 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
288 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
289 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
290 if (evp_cipher == NULL)
291 {
292 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
293 goto err;
294 }
295 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
296 break;
297 case NID_pkcs7_enveloped:
298 rsk=p7->d.enveloped->recipientinfo;
299 enc_alg=p7->d.enveloped->enc_data->algorithm;
300 data_body=p7->d.enveloped->enc_data->enc_data;
301 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
302 if (evp_cipher == NULL)
303 {
304 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
305 goto err;
306 }
307 xalg=p7->d.enveloped->enc_data->algorithm;
308 break;
309 default:
310 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
311 goto err;
312 }
313
314 /* We will be checking the signature */
315 if (md_sk != NULL)
316 {
317 for (i=0; i<sk_num(md_sk); i++)
318 {
319 xa=(X509_ALGOR *)sk_value(md_sk,i);
320 if ((btmp=BIO_new(BIO_f_md())) == NULL)
321 {
322 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
323 goto err;
324 }
325
326 j=OBJ_obj2nid(xa->algorithm);
327 evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
328 if (evp_md == NULL)
329 {
330 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
331 goto err;
332 }
333
334 BIO_set_md(btmp,evp_md);
335 if (out == NULL)
336 out=btmp;
337 else
338 BIO_push(out,btmp);
339 btmp=NULL;
340 }
341 }
342
343 if (evp_cipher != NULL)
344 {
345 #if 0
346 unsigned char key[EVP_MAX_KEY_LENGTH];
347 unsigned char iv[EVP_MAX_IV_LENGTH];
348 unsigned char *p;
349 int keylen,ivlen;
350 int max;
351 X509_OBJECT ret;
352 #endif
353 int jj;
354
355 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
356 {
357 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
358 goto err;
359 }
360
361 /* It was encrypted, we need to decrypt the secret key
362 * with the private key */
363
364 /* Find the recipientInfo which matches the passed certificate
365 * (if any)
366 */
367
368 for (i=0; i<sk_num(rsk); i++) {
369 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
370 if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
371 pcert->cert_info->issuer) &&
372 !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
373 ri->issuer_and_serial->serial)) break;
374 ri=NULL;
375 }
376 if (ri == NULL) {
377 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
378 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
379 return(NULL);
380 }
381
382 jj=EVP_PKEY_size(pkey);
383 tmp=Malloc(jj+10);
384 if (tmp == NULL)
385 {
386 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
387 goto err;
388 }
389
390 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
391 ASN1_STRING_data(ri->enc_key),
392 ASN1_STRING_length(ri->enc_key),
393 pkey);
394 if (jj <= 0)
395 {
396 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
397 goto err;
398 }
399
400 evp_ctx=NULL;
401 BIO_get_cipher_ctx(etmp,&evp_ctx);
402 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
403 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
404 return(NULL);
405
406 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
407 {
408 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
409 PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
410 goto err;
411 }
412 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
413
414 memset(tmp,0,jj);
415
416 if (out == NULL)
417 out=etmp;
418 else
419 BIO_push(out,etmp);
420 etmp=NULL;
421 }
422
423 #if 1
424 if (p7->detached || (in_bio != NULL))
425 {
426 bio=in_bio;
427 }
428 else
429 {
430 bio=BIO_new(BIO_s_mem());
431 /* We need to set this so that when we have read all
432 * the data, the encrypt BIO, if present, will read
433 * EOF and encode the last few bytes */
434 BIO_set_mem_eof_return(bio,0);
435
436 if (data_body->length > 0)
437 BIO_write(bio,(char *)data_body->data,data_body->length);
438 }
439 BIO_push(out,bio);
440 bio=NULL;
441 #endif
442 if (0)
443 {
444 err:
445 if (out != NULL) BIO_free_all(out);
446 if (btmp != NULL) BIO_free_all(btmp);
447 if (etmp != NULL) BIO_free_all(etmp);
448 if (bio != NULL) BIO_free_all(bio);
449 out=NULL;
450 }
451 if (tmp != NULL)
452 Free(tmp);
453 return(out);
454 }
455
456 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
457 {
458 int ret=0;
459 int i,j;
460 BIO *btmp;
461 BUF_MEM *buf_mem=NULL;
462 BUF_MEM *buf=NULL;
463 PKCS7_SIGNER_INFO *si;
464 EVP_MD_CTX *mdc,ctx_tmp;
465 STACK *sk,*si_sk=NULL;
466 unsigned char *p,*pp=NULL;
467 int x;
468 ASN1_OCTET_STRING *os=NULL;
469
470 i=OBJ_obj2nid(p7->type);
471 p7->state=PKCS7_S_HEADER;
472
473 switch (i)
474 {
475 case NID_pkcs7_signedAndEnveloped:
476 /* XXXXXXXXXXXXXXXX */
477 si_sk=p7->d.signed_and_enveloped->signer_info;
478 os=ASN1_OCTET_STRING_new();
479 p7->d.signed_and_enveloped->enc_data->enc_data=os;
480 break;
481 case NID_pkcs7_enveloped:
482 /* XXXXXXXXXXXXXXXX */
483 os=ASN1_OCTET_STRING_new();
484 p7->d.enveloped->enc_data->enc_data=os;
485 break;
486 case NID_pkcs7_signed:
487 si_sk=p7->d.sign->signer_info;
488 os=p7->d.sign->contents->d.data;
489 /* If detached data then the content is excluded */
490 if(p7->detached) {
491 ASN1_OCTET_STRING_free(os);
492 p7->d.sign->contents->d.data = NULL;
493 }
494 break;
495 }
496
497 if (si_sk != NULL)
498 {
499 if ((buf=BUF_MEM_new()) == NULL)
500 {
501 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
502 goto err;
503 }
504 for (i=0; i<sk_num(si_sk); i++)
505 {
506 si=(PKCS7_SIGNER_INFO *)
507 sk_value(si_sk,i);
508 if (si->pkey == NULL) continue;
509
510 j=OBJ_obj2nid(si->digest_alg->algorithm);
511
512 btmp=bio;
513 for (;;)
514 {
515 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
516 == NULL)
517 {
518 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
519 goto err;
520 }
521 BIO_get_md_ctx(btmp,&mdc);
522 if (mdc == NULL)
523 {
524 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
525 goto err;
526 }
527 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
528 break;
529 else
530 btmp=btmp->next_bio;
531 }
532
533 /* We now have the EVP_MD_CTX, lets do the
534 * signing. */
535 memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
536 if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
537 {
538 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
539 goto err;
540 }
541
542 sk=si->auth_attr;
543
544 /* If there are attributes, we add the digest
545 * attribute and only sign the attributes */
546 if ((sk != NULL) && (sk_num(sk) != 0))
547 {
548 unsigned char md_data[EVP_MAX_MD_SIZE];
549 unsigned int md_len;
550 ASN1_OCTET_STRING *digest;
551 ASN1_UTCTIME *sign_time;
552 const EVP_MD *md_tmp;
553
554 /* Add signing time */
555 sign_time=X509_gmtime_adj(NULL,0);
556 PKCS7_add_signed_attribute(si,
557 NID_pkcs9_signingTime,
558 V_ASN1_UTCTIME,sign_time);
559
560 /* Add digest */
561 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
562 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
563 digest=ASN1_OCTET_STRING_new();
564 ASN1_OCTET_STRING_set(digest,md_data,md_len);
565 PKCS7_add_signed_attribute(si,
566 NID_pkcs9_messageDigest,
567 V_ASN1_OCTET_STRING,digest);
568
569 /* Now sign the mess */
570 EVP_SignInit(&ctx_tmp,md_tmp);
571 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
572 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
573 pp=(unsigned char *)Malloc(x);
574 p=pp;
575 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
576 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
577 EVP_SignUpdate(&ctx_tmp,pp,x);
578 Free(pp);
579 pp=NULL;
580 }
581
582 if (si->pkey->type == EVP_PKEY_DSA)
583 ctx_tmp.digest=EVP_dss1();
584
585 if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
586 (unsigned int *)&buf->length,si->pkey))
587 {
588 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
589 goto err;
590 }
591 if (!ASN1_STRING_set(si->enc_digest,
592 (unsigned char *)buf->data,buf->length))
593 {
594 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
595 goto err;
596 }
597 }
598 }
599
600 if (!p7->detached)
601 {
602 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
603 if (btmp == NULL)
604 {
605 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
606 goto err;
607 }
608 BIO_get_mem_ptr(btmp,&buf_mem);
609 ASN1_OCTET_STRING_set(os,
610 (unsigned char *)buf_mem->data,buf_mem->length);
611 }
612 if (pp != NULL) Free(pp);
613 pp=NULL;
614
615 ret=1;
616 err:
617 if (buf != NULL) BUF_MEM_free(buf);
618 return(ret);
619 }
620
621 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
622 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
623 {
624 /* PKCS7_SIGNED *s; */
625 ASN1_OCTET_STRING *os;
626 EVP_MD_CTX mdc_tmp,*mdc;
627 unsigned char *pp,*p;
628 PKCS7_ISSUER_AND_SERIAL *ias;
629 int ret=0,i;
630 int md_type;
631 STACK *sk;
632 STACK_OF(X509) *cert;
633 BIO *btmp;
634 X509 *x509;
635 EVP_PKEY *pkey;
636
637 if (PKCS7_type_is_signed(p7))
638 {
639 cert=p7->d.sign->cert;
640 }
641 else if (PKCS7_type_is_signedAndEnveloped(p7))
642 {
643 cert=p7->d.signed_and_enveloped->cert;
644 }
645 else
646 {
647 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
648 goto err;
649 }
650 /* XXXXXXXXXXXXXXXXXXXXXXX */
651 ias=si->issuer_and_serial;
652
653 x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
654
655 /* were we able to find the cert in passed to us */
656 if (x509 == NULL)
657 {
658 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
659 goto err;
660 }
661
662 /* Lets verify */
663 X509_STORE_CTX_init(ctx,cert_store,x509,cert);
664 i=X509_verify_cert(ctx);
665 if (i <= 0)
666 {
667 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
668 goto err;
669 }
670 X509_STORE_CTX_cleanup(ctx);
671
672 /* So we like 'x509', lets check the signature. */
673 md_type=OBJ_obj2nid(si->digest_alg->algorithm);
674
675 btmp=bio;
676 for (;;)
677 {
678 if ((btmp == NULL) ||
679 ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
680 {
681 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
682 goto err;
683 }
684 BIO_get_md_ctx(btmp,&mdc);
685 if (mdc == NULL)
686 {
687 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
688 goto err;
689 }
690 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
691 break;
692 btmp=btmp->next_bio;
693 }
694
695 /* mdc is the digest ctx that we want, unless there are attributes,
696 * in which case the digest is the signed attributes */
697 memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
698
699 sk=si->auth_attr;
700 if ((sk != NULL) && (sk_num(sk) != 0))
701 {
702 unsigned char md_dat[EVP_MAX_MD_SIZE];
703 unsigned int md_len;
704 ASN1_OCTET_STRING *message_digest;
705
706 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
707 message_digest=PKCS7_digest_from_attributes(sk);
708 if (!message_digest)
709 {
710 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
711 goto err;
712 }
713 if ((message_digest->length != (int)md_len) ||
714 (memcmp(message_digest->data,md_dat,md_len)))
715 {
716 #if 0
717 {
718 int ii;
719 for (ii=0; ii<message_digest->length; ii++)
720 printf("%02X",message_digest->data[ii]); printf(" sent\n");
721 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
722 }
723 #endif
724 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
725 ret= -1;
726 goto err;
727 }
728
729 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
730 /* Note: when forming the encoding of the attributes we
731 * shouldn't reorder them or this will break the signature.
732 * This is done by using the IS_SEQUENCE flag.
733 */
734 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
735 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
736 pp=(unsigned char *)Malloc(i);
737 p=pp;
738 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
739 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
740 EVP_VerifyUpdate(&mdc_tmp,pp,i);
741
742 Free(pp);
743 }
744
745 os=si->enc_digest;
746 pkey = X509_get_pubkey(x509);
747 if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
748
749 i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
750 EVP_PKEY_free(pkey);
751 if (i <= 0)
752 {
753 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
754 ret= -1;
755 goto err;
756 }
757 else
758 ret=1;
759 err:
760 return(ret);
761 }
762
763 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
764 {
765 STACK *rsk;
766 PKCS7_RECIP_INFO *ri;
767 int i;
768
769 i=OBJ_obj2nid(p7->type);
770 if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
771 rsk=p7->d.signed_and_enveloped->recipientinfo;
772 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
773 if (sk_num(rsk) <= idx) return(NULL);
774 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
775 return(ri->issuer_and_serial);
776 }
777
778 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
779 {
780 return(get_attribute(si->auth_attr,nid));
781 }
782
783 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
784 {
785 return(get_attribute(si->unauth_attr,nid));
786 }
787
788 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
789 {
790 int i;
791 X509_ATTRIBUTE *xa;
792 ASN1_OBJECT *o;
793
794 o=OBJ_nid2obj(nid);
795 if (!o || !sk) return(NULL);
796 for (i=0; i<sk_num(sk); i++)
797 {
798 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
799 if (OBJ_cmp(xa->object,o) == 0)
800 {
801 if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
802 return(sk_ASN1_TYPE_value(xa->value.set,0));
803 else
804 return(NULL);
805 }
806 }
807 return(NULL);
808 }
809
810 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
811 {
812 ASN1_TYPE *astype;
813 if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
814 return astype->value.octet_string;
815 }
816
817 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
818 {
819 int i;
820
821 if (p7si->auth_attr != NULL)
822 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
823 p7si->auth_attr=sk_dup(sk);
824 for (i=0; i<sk_num(sk); i++)
825 {
826 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
827 (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
828 return(0);
829 }
830 return(1);
831 }
832
833 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
834 {
835 int i;
836
837 if (p7si->unauth_attr != NULL)
838 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
839 p7si->unauth_attr=sk_dup(sk);
840 for (i=0; i<sk_num(sk); i++)
841 {
842 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
843 (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
844 return(0);
845 }
846 return(1);
847 }
848
849 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
850 void *value)
851 {
852 return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
853 }
854
855 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
856 void *value)
857 {
858 return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
859 }
860
861 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
862 {
863 X509_ATTRIBUTE *attr=NULL;
864
865 if (*sk == NULL)
866 {
867 *sk = sk_new(NULL);
868 new_attrib:
869 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
870 sk_push(*sk,(char *)attr);
871 }
872 else
873 {
874 int i;
875
876 for (i=0; i<sk_num(*sk); i++)
877 {
878 attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
879 if (OBJ_obj2nid(attr->object) == nid)
880 {
881 X509_ATTRIBUTE_free(attr);
882 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
883 sk_value(*sk,i)=(char *)attr;
884 goto end;
885 }
886 }
887 goto new_attrib;
888 }
889 end:
890 return(1);
891 }
892
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