Kill evil casts, fix PKCS#7 and add new X509V3 Function.
[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 #if 1
69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
70         {
71         int i,j;
72         BIO *out=NULL,*btmp=NULL;
73         X509_ALGOR *xa;
74         const EVP_MD *evp_md;
75         const EVP_CIPHER *evp_cipher=NULL;
76         STACK *md_sk=NULL,*rsk=NULL;
77         X509_ALGOR *xalg=NULL;
78         PKCS7_RECIP_INFO *ri=NULL;
79         EVP_PKEY *pkey;
80
81         i=OBJ_obj2nid(p7->type);
82         p7->state=PKCS7_S_HEADER;
83
84         switch (i)
85                 {
86         case NID_pkcs7_signed:
87                 md_sk=p7->d.sign->md_algs;
88                 break;
89         case NID_pkcs7_signedAndEnveloped:
90                 rsk=p7->d.signed_and_enveloped->recipientinfo;
91                 md_sk=p7->d.signed_and_enveloped->md_algs;
92                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
93                 if (evp_cipher == NULL)
94                         {
95                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
96                         goto err;
97                         }
98                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
99                 break;
100         case NID_pkcs7_enveloped:
101                 rsk=p7->d.enveloped->recipientinfo;
102                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
103                 if (evp_cipher == NULL)
104                         {
105                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
106                         goto err;
107                         }
108                 xalg=p7->d.enveloped->enc_data->algorithm;
109                 break;
110         default:
111                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
112                 goto err;
113                 }
114
115         if (md_sk != NULL)
116                 {
117                 for (i=0; i<sk_num(md_sk); i++)
118                         {
119                         xa=(X509_ALGOR *)sk_value(md_sk,i);
120                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
121                                 {
122                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
123                                 goto err;
124                                 }
125
126                         j=OBJ_obj2nid(xa->algorithm);
127                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
128                         if (evp_md == NULL)
129                                 {
130                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
131                                 goto err;
132                                 }
133
134                         BIO_set_md(btmp,evp_md);
135                         if (out == NULL)
136                                 out=btmp;
137                         else
138                                 BIO_push(out,btmp);
139                         btmp=NULL;
140                         }
141                 }
142
143         if (evp_cipher != NULL)
144                 {
145                 unsigned char key[EVP_MAX_KEY_LENGTH];
146                 unsigned char iv[EVP_MAX_IV_LENGTH];
147                 int keylen,ivlen;
148                 int jj,max;
149                 unsigned char *tmp;
150
151                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
152                         {
153                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
154                         goto err;
155                         }
156                 keylen=EVP_CIPHER_key_length(evp_cipher);
157                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
158
159                 if (ivlen > 0)
160                         {
161                         ASN1_OCTET_STRING *os;
162
163                         RAND_bytes(iv,ivlen);
164                         os=ASN1_OCTET_STRING_new();
165                         ASN1_OCTET_STRING_set(os,iv,ivlen);
166 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX this needs to change */
167                         if (xalg->parameter == NULL)
168                                 xalg->parameter=ASN1_TYPE_new();
169                         ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
170                                 (char *)os);
171                         }
172                 RAND_bytes(key,keylen);
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                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
211
212                 if (out == NULL)
213                         out=btmp;
214                 else
215                         BIO_push(out,btmp);
216                 btmp=NULL;
217                 }
218
219         if (bio == NULL) /* ??????????? */
220                 {
221                 if (p7->detached)
222                         bio=BIO_new(BIO_s_null());
223                 else
224                         {
225                         bio=BIO_new(BIO_s_mem());
226                         /* We need to set this so that when we have read all
227                          * the data, the encrypt BIO, if present, will read
228                          * EOF and encode the last few bytes */
229                         BIO_set_mem_eof_return(bio,0);
230
231                         if (PKCS7_type_is_signed(p7) &&
232                                 PKCS7_type_is_data(p7->d.sign->contents))
233                                 {
234                                 ASN1_OCTET_STRING *os;
235
236                                 os=p7->d.sign->contents->d.data;
237                                 if (os->length > 0)
238                                         BIO_write(bio,(char *)os->data,
239                                                 os->length);
240                                 }
241                         }
242                 }
243         BIO_push(out,bio);
244         bio=NULL;
245         if (0)
246                 {
247 err:
248                 if (out != NULL)
249                         BIO_free_all(out);
250                 if (btmp != NULL)
251                         BIO_free_all(btmp);
252                 out=NULL;
253                 }
254         return(out);
255         }
256
257 /* int */
258 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio,
259              X509_STORE *xs)
260         {
261         int i,j;
262         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
263         char *tmp=NULL;
264         X509_ALGOR *xa;
265         ASN1_OCTET_STRING *data_body=NULL;
266         const EVP_MD *evp_md;
267         const EVP_CIPHER *evp_cipher=NULL;
268         EVP_CIPHER_CTX *evp_ctx=NULL;
269         X509_ALGOR *enc_alg=NULL;
270         STACK *md_sk=NULL,*rsk=NULL;
271         X509_ALGOR *xalg=NULL;
272         PKCS7_RECIP_INFO *ri=NULL;
273 /*      EVP_PKEY *pkey; */
274 #if 0
275         X509_STORE_CTX s_ctx;
276 #endif
277
278         i=OBJ_obj2nid(p7->type);
279         p7->state=PKCS7_S_HEADER;
280
281         switch (i)
282                 {
283         case NID_pkcs7_signed:
284                 data_body=p7->d.sign->contents->d.data;
285                 md_sk=p7->d.sign->md_algs;
286                 break;
287         case NID_pkcs7_signedAndEnveloped:
288                 rsk=p7->d.signed_and_enveloped->recipientinfo;
289                 md_sk=p7->d.signed_and_enveloped->md_algs;
290                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
291                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
292                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
293                 if (evp_cipher == NULL)
294                         {
295                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
296                         goto err;
297                         }
298                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
299                 break;
300         case NID_pkcs7_enveloped:
301                 rsk=p7->d.enveloped->recipientinfo;
302                 enc_alg=p7->d.enveloped->enc_data->algorithm;
303                 data_body=p7->d.enveloped->enc_data->enc_data;
304                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
305                 if (evp_cipher == NULL)
306                         {
307                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
308                         goto err;
309                         }
310                 xalg=p7->d.enveloped->enc_data->algorithm;
311                 break;
312         default:
313                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
314                 goto err;
315                 }
316
317         /* We will be checking the signature */
318         if (md_sk != NULL)
319                 {
320                 for (i=0; i<sk_num(md_sk); i++)
321                         {
322                         xa=(X509_ALGOR *)sk_value(md_sk,i);
323                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
324                                 {
325                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
326                                 goto err;
327                                 }
328
329                         j=OBJ_obj2nid(xa->algorithm);
330                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
331                         if (evp_md == NULL)
332                                 {
333                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
334                                 goto err;
335                                 }
336
337                         BIO_set_md(btmp,evp_md);
338                         if (out == NULL)
339                                 out=btmp;
340                         else
341                                 BIO_push(out,btmp);
342                         btmp=NULL;
343                         }
344                 }
345
346         if (evp_cipher != NULL)
347                 {
348 #if 0
349                 unsigned char key[EVP_MAX_KEY_LENGTH];
350                 unsigned char iv[EVP_MAX_IV_LENGTH];
351                 unsigned char *p;
352                 int keylen,ivlen;
353                 int max;
354                 X509_OBJECT ret;
355 #endif
356                 int jj;
357
358                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
359                         {
360                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
361                         goto err;
362                         }
363
364                 /* It was encrypted, we need to decrypt the secret key
365                  * with the private key */
366
367                 /* We need to find a private key for one of the people in the
368                  * recipentinfo list */
369                 if (rsk == NULL)
370                         return(NULL);
371
372                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
373 #if 0
374                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
375                 for (i=0; i<sk_num(rsk); i++)
376                         {
377                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
378                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
379                                 X509_LU_PKEY,
380                                 ri->issuer_and_serial->issuer,
381                                 ri->issuer_and_serial->serial,
382                                 &ret))
383                                 break;
384                         ri=NULL;
385                         }
386                 if (ri == NULL) return(NULL);   
387                 pkey=ret.data.pkey;
388 #endif
389                 if (pkey == NULL)
390                         {
391                         return(NULL);
392                         }
393
394                 jj=EVP_PKEY_size(pkey);
395                 tmp=Malloc(jj+10);
396                 if (tmp == NULL)
397                         {
398                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
399                         goto err;
400                         }
401
402                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
403                         ASN1_STRING_data(ri->enc_key),
404                         ASN1_STRING_length(ri->enc_key),
405                         pkey);
406                 if (jj <= 0)
407                         {
408                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
409                         goto err;
410                         }
411
412                 evp_ctx=NULL;
413                 BIO_get_cipher_ctx(etmp,&evp_ctx);
414                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
415                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
416                         return(NULL);
417
418                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
419                         {
420                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
421                         goto err;
422                         }
423                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
424
425                 memset(tmp,0,jj);
426
427                 if (out == NULL)
428                         out=etmp;
429                 else
430                         BIO_push(out,etmp);
431                 etmp=NULL;
432                 }
433
434 #if 1
435         if (p7->detached || (in_bio != NULL))
436                 {
437                 bio=in_bio;
438                 }
439         else 
440                 {
441                 bio=BIO_new(BIO_s_mem());
442                 /* We need to set this so that when we have read all
443                  * the data, the encrypt BIO, if present, will read
444                  * EOF and encode the last few bytes */
445                 BIO_set_mem_eof_return(bio,0);
446
447                 if (data_body->length > 0)
448                         BIO_write(bio,(char *)data_body->data,data_body->length);
449                 }
450         BIO_push(out,bio);
451         bio=NULL;
452 #endif
453         if (0)
454                 {
455 err:
456                 if (out != NULL) BIO_free_all(out);
457                 if (btmp != NULL) BIO_free_all(btmp);
458                 if (etmp != NULL) BIO_free_all(etmp);
459                 if (bio != NULL) BIO_free_all(bio);
460                 out=NULL;
461                 }
462         if (tmp != NULL)
463                 Free(tmp);
464         return(out);
465         }
466 #endif
467
468 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
469         {
470         int ret=0;
471         int i,j;
472         BIO *btmp;
473         BUF_MEM *buf_mem=NULL;
474         BUF_MEM *buf=NULL;
475         PKCS7_SIGNER_INFO *si;
476         EVP_MD_CTX *mdc,ctx_tmp;
477         STACK *sk,*si_sk=NULL;
478         unsigned char *p,*pp=NULL;
479         int x;
480         ASN1_OCTET_STRING *os=NULL;
481
482         i=OBJ_obj2nid(p7->type);
483         p7->state=PKCS7_S_HEADER;
484
485         switch (i)
486                 {
487         case NID_pkcs7_signedAndEnveloped:
488                 /* XXXXXXXXXXXXXXXX */
489                 si_sk=p7->d.signed_and_enveloped->signer_info;
490                 os=ASN1_OCTET_STRING_new();
491                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
492                 break;
493         case NID_pkcs7_enveloped:
494                 /* XXXXXXXXXXXXXXXX */
495                 os=ASN1_OCTET_STRING_new();
496                 p7->d.enveloped->enc_data->enc_data=os;
497                 break;
498         case NID_pkcs7_signed:
499                 si_sk=p7->d.sign->signer_info;
500                 os=p7->d.sign->contents->d.data;
501                 /* If detached data then the content is excluded */
502                 if(p7->detached) {
503                         ASN1_OCTET_STRING_free(os);
504                         p7->d.sign->contents->d.data = NULL;
505                 }
506                 break;
507                 }
508
509         if (si_sk != NULL)
510                 {
511                 if ((buf=BUF_MEM_new()) == NULL)
512                         {
513                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
514                         goto err;
515                         }
516                 for (i=0; i<sk_num(si_sk); i++)
517                         {
518                         si=(PKCS7_SIGNER_INFO *)
519                                 sk_value(si_sk,i);
520                         if (si->pkey == NULL) continue;
521
522                         j=OBJ_obj2nid(si->digest_alg->algorithm);
523
524                         btmp=bio;
525                         for (;;)
526                                 {
527                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 
528                                         == NULL)
529                                         {
530                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
531                                         goto err;
532                                         }
533                                 BIO_get_md_ctx(btmp,&mdc);
534                                 if (mdc == NULL)
535                                         {
536                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
537                                         goto err;
538                                         }
539                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
540                                         break;
541                                 else
542                                         btmp=btmp->next_bio;
543                                 }
544                         
545                         /* We now have the EVP_MD_CTX, lets do the
546                          * signing. */
547                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
548                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
549                                 {
550                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
551                                 goto err;
552                                 }
553
554                         sk=si->auth_attr;
555
556                         /* If there are attributes, we add the digest
557                          * attribute and only sign the attributes */
558                         if ((sk != NULL) && (sk_num(sk) != 0))
559                                 {
560                                 unsigned char md_data[EVP_MAX_MD_SIZE];
561                                 unsigned int md_len;
562                                 ASN1_OCTET_STRING *digest;
563                                 ASN1_UTCTIME *sign_time;
564                                 const EVP_MD *md_tmp;
565
566                                 /* Add signing time */
567                                 sign_time=X509_gmtime_adj(NULL,0);
568                                 PKCS7_add_signed_attribute(si,
569                                         NID_pkcs9_signingTime,
570                                         V_ASN1_UTCTIME,sign_time);
571
572                                 /* Add digest */
573                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
574                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
575                                 digest=ASN1_OCTET_STRING_new();
576                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
577                                 PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
578                                         V_ASN1_OCTET_STRING,digest);
579
580                                 /* Now sign the mess */
581                                 EVP_SignInit(&ctx_tmp,md_tmp);
582                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
583                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
584                                 pp=(unsigned char *)Malloc(x);
585                                 p=pp;
586                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
587                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
588                                 EVP_SignUpdate(&ctx_tmp,pp,x);
589                                 Free(pp);
590                                 pp=NULL;
591                                 }
592
593                         if (si->pkey->type == EVP_PKEY_DSA)
594                                 ctx_tmp.digest=EVP_dss1();
595
596                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
597                                 (unsigned int *)&buf->length,si->pkey))
598                                 {
599                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
600                                 goto err;
601                                 }
602                         if (!ASN1_STRING_set(si->enc_digest,
603                                 (unsigned char *)buf->data,buf->length))
604                                 {
605                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
606                                 goto err;
607                                 }
608                         }
609                 }
610
611         if (!p7->detached)
612                 {
613                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
614                 if (btmp == NULL)
615                         {
616                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
617                         goto err;
618                         }
619                 BIO_get_mem_ptr(btmp,&buf_mem);
620                 ASN1_OCTET_STRING_set(os,
621                         (unsigned char *)buf_mem->data,buf_mem->length);
622                 }
623         if (pp != NULL) Free(pp);
624         pp=NULL;
625
626         ret=1;
627 err:
628         if (buf != NULL) BUF_MEM_free(buf);
629         return(ret);
630         }
631
632 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
633              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
634         {
635 /*      PKCS7_SIGNED *s; */
636         ASN1_OCTET_STRING *os;
637         EVP_MD_CTX mdc_tmp,*mdc;
638         unsigned char *pp,*p;
639         PKCS7_ISSUER_AND_SERIAL *ias;
640         int ret=0,i;
641         int md_type;
642         STACK *sk;
643         STACK_OF(X509) *cert;
644         BIO *btmp;
645         X509 *x509;
646         EVP_PKEY *pkey;
647
648         if (PKCS7_type_is_signed(p7))
649                 {
650                 cert=p7->d.sign->cert;
651                 }
652         else if (PKCS7_type_is_signedAndEnveloped(p7))
653                 {
654                 cert=p7->d.signed_and_enveloped->cert;
655                 }
656         else
657                 {
658                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
659                 goto err;
660                 }
661         /* XXXXXXXXXXXXXXXXXXXXXXX */
662         ias=si->issuer_and_serial;
663
664         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
665
666         /* were we able to find the cert in passed to us */
667         if (x509 == NULL)
668                 {
669                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
670                 goto err;
671                 }
672
673         /* Lets verify */
674         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
675         i=X509_verify_cert(ctx);
676         if (i <= 0) 
677                 {
678                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
679                 goto err;
680                 }
681         X509_STORE_CTX_cleanup(ctx);
682
683         /* So we like 'x509', lets check the signature. */
684         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
685
686         btmp=bio;
687         for (;;)
688                 {
689                 if ((btmp == NULL) ||
690                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
691                         {
692                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
693                         goto err;
694                         }
695                 BIO_get_md_ctx(btmp,&mdc);
696                 if (mdc == NULL)
697                         {
698                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
699                         goto err;
700                         }
701                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
702                         break;
703                 btmp=btmp->next_bio;    
704                 }
705
706         /* mdc is the digest ctx that we want, unless there are attributes,
707          * in which case the digest is the signed attributes */
708         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
709
710         sk=si->auth_attr;
711         if ((sk != NULL) && (sk_num(sk) != 0))
712                 {
713                 unsigned char md_dat[EVP_MAX_MD_SIZE];
714                 unsigned int md_len;
715                 ASN1_OCTET_STRING *message_digest;
716
717                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
718                 message_digest=PKCS7_digest_from_attributes(sk);
719                 if (!message_digest)
720                         {
721                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
722                         goto err;
723                         }
724                 if ((message_digest->length != (int)md_len) ||
725                         (memcmp(message_digest->data,md_dat,md_len)))
726                         {
727 #if 0
728 {
729 int ii;
730 for (ii=0; ii<message_digest->length; ii++)
731         printf("%02X",message_digest->data[ii]); printf(" sent\n");
732 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
733 }
734 #endif
735                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
736                         ret= -1;
737                         goto err;
738                         }
739
740                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
741                 /* Note: when forming the encoding of the attributes we
742                  * shouldn't reorder them or this will break the signature.
743                  * This is done by using the IS_SEQUENCE flag.
744                  */
745                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
746                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
747                 pp=(unsigned char *)Malloc(i);
748                 p=pp;
749                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
750                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
751                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
752
753                 Free(pp);
754                 }
755
756         os=si->enc_digest;
757         pkey = X509_get_pubkey(x509);
758         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
759
760         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
761         EVP_PKEY_free(pkey);
762         if (i <= 0)
763                 {
764                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
765                 ret= -1;
766                 goto err;
767                 }
768         else
769                 ret=1;
770 err:
771         return(ret);
772         }
773
774 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
775         {
776         STACK *rsk;
777         PKCS7_RECIP_INFO *ri;
778         int i;
779
780         i=OBJ_obj2nid(p7->type);
781         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
782         rsk=p7->d.signed_and_enveloped->recipientinfo;
783         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
784         if (sk_num(rsk) <= idx) return(NULL);
785         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
786         return(ri->issuer_and_serial);
787         }
788
789 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
790         {
791         return(get_attribute(si->auth_attr,nid));
792         }
793
794 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
795         {
796         return(get_attribute(si->unauth_attr,nid));
797         }
798
799 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
800         {
801         int i;
802         X509_ATTRIBUTE *xa;
803         ASN1_OBJECT *o;
804
805         o=OBJ_nid2obj(nid);
806         if (o == NULL) return(NULL);
807         for (i=0; i<sk_num(sk); i++)
808                 {
809                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
810                 if (OBJ_cmp(xa->object,o) == 0)
811                         {
812                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
813                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
814                         else
815                                 return(NULL);
816                         }
817                 }
818         return(NULL);
819         }
820
821 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
822         {
823         X509_ATTRIBUTE *attr;
824         ASN1_TYPE *astype;
825         int i;
826         if (!sk || !sk_num(sk)) return NULL;
827         /* Search the attributes for a digest */
828         for (i = 0; i < sk_num(sk); i++)
829                 {
830                 attr = (X509_ATTRIBUTE *) sk_value(sk, i);
831                 if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
832                         {
833                         if (!attr->set) return NULL;
834                         if (!attr->value.set
835                             || !sk_ASN1_TYPE_num(attr->value.set) )
836                             return NULL;
837                         astype = sk_ASN1_TYPE_value(attr->value.set, 0);
838                         return astype->value.octet_string;
839                         }
840                 }
841         return NULL;
842         }
843
844 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
845         {
846         int i;
847
848         if (p7si->auth_attr != NULL)
849                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
850         p7si->auth_attr=sk_dup(sk);
851         for (i=0; i<sk_num(sk); i++)
852                 {
853                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
854                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
855                         return(0);
856                 }
857         return(1);
858         }
859
860 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
861         {
862         int i;
863
864         if (p7si->unauth_attr != NULL)
865                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
866         p7si->unauth_attr=sk_dup(sk);
867         for (i=0; i<sk_num(sk); i++)
868                 {
869                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
870                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
871                         return(0);
872                 }
873         return(1);
874         }
875
876 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
877              void *value)
878         {
879         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
880         }
881
882 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
883              void *value)
884         {
885         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
886         }
887
888 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
889         {
890         X509_ATTRIBUTE *attr=NULL;
891
892         if (*sk == NULL)
893                 {
894                 *sk = sk_new(NULL);
895 new_attrib:
896                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
897                 sk_push(*sk,(char *)attr);
898                 }
899         else
900                 {
901                 int i;
902
903                 for (i=0; i<sk_num(*sk); i++)
904                         {
905                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
906                         if (OBJ_obj2nid(attr->object) == nid)
907                                 {
908                                 X509_ATTRIBUTE_free(attr);
909                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
910                                 sk_value(*sk,i)=(char *)attr;
911                                 goto end;
912                                 }
913                         }
914                 goto new_attrib;
915                 }
916 end:
917         return(1);
918         }
919