Remove dss1 hack from S/MIME code.
[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 #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
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
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
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
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_old(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
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 */
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_old(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_old(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
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
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
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
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 #if 0
950 #ifndef OPENSSL_NO_DSA
951         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
952 #endif
953 #ifndef OPENSSL_NO_ECDSA
954         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
955 #endif
956 #endif
957
958         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
959         EVP_PKEY_free(pkey);
960         if (i <= 0)
961                 {
962                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
963                                                 PKCS7_R_SIGNATURE_FAILURE);
964                 ret= -1;
965                 goto err;
966                 }
967         else
968                 ret=1;
969 err:
970         EVP_MD_CTX_cleanup(&mdc_tmp);
971         return(ret);
972         }
973
974 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
975         {
976         STACK_OF(PKCS7_RECIP_INFO) *rsk;
977         PKCS7_RECIP_INFO *ri;
978         int i;
979
980         i=OBJ_obj2nid(p7->type);
981         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
982         rsk=p7->d.signed_and_enveloped->recipientinfo;
983         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
984         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
985         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
986         return(ri->issuer_and_serial);
987         }
988
989 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
990         {
991         return(get_attribute(si->auth_attr,nid));
992         }
993
994 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
995         {
996         return(get_attribute(si->unauth_attr,nid));
997         }
998
999 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1000         {
1001         int i;
1002         X509_ATTRIBUTE *xa;
1003         ASN1_OBJECT *o;
1004
1005         o=OBJ_nid2obj(nid);
1006         if (!o || !sk) return(NULL);
1007         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1008                 {
1009                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1010                 if (OBJ_cmp(xa->object,o) == 0)
1011                         {
1012                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1013                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1014                         else
1015                                 return(NULL);
1016                         }
1017                 }
1018         return(NULL);
1019         }
1020
1021 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1022 {
1023         ASN1_TYPE *astype;
1024         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1025         return astype->value.octet_string;
1026 }
1027
1028 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1029                                 STACK_OF(X509_ATTRIBUTE) *sk)
1030         {
1031         int i;
1032
1033         if (p7si->auth_attr != NULL)
1034                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1035         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1036         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1037                 {
1038                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1039                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1040                     == NULL)
1041                         return(0);
1042                 }
1043         return(1);
1044         }
1045
1046 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1047         {
1048         int i;
1049
1050         if (p7si->unauth_attr != NULL)
1051                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1052                                            X509_ATTRIBUTE_free);
1053         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1054         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1055                 {
1056                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1057                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1058                     == NULL)
1059                         return(0);
1060                 }
1061         return(1);
1062         }
1063
1064 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1065              void *value)
1066         {
1067         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1068         }
1069
1070 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1071              void *value)
1072         {
1073         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1074         }
1075
1076 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1077                          void *value)
1078         {
1079         X509_ATTRIBUTE *attr=NULL;
1080
1081         if (*sk == NULL)
1082                 {
1083                 *sk = sk_X509_ATTRIBUTE_new_null();
1084 new_attrib:
1085                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1086                 sk_X509_ATTRIBUTE_push(*sk,attr);
1087                 }
1088         else
1089                 {
1090                 int i;
1091
1092                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1093                         {
1094                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1095                         if (OBJ_obj2nid(attr->object) == nid)
1096                                 {
1097                                 X509_ATTRIBUTE_free(attr);
1098                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1099                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1100                                 goto end;
1101                                 }
1102                         }
1103                 goto new_attrib;
1104                 }
1105 end:
1106         return(1);
1107         }
1108