Remove old digest type hacks for non RSA keys.
[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 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
142                                         unsigned char *key, int keylen)
143         {
144         EVP_PKEY_CTX *pctx = NULL;
145         EVP_PKEY *pkey = NULL;
146         unsigned char *ek = NULL;
147         int ret = 0;
148         int eklen;
149
150         pkey = X509_get_pubkey(ri->cert);
151
152         if (!pkey)
153                 return 0;
154
155         pctx = EVP_PKEY_CTX_new(pkey, NULL);
156         if (!pctx)
157                 return 0;
158
159         if (EVP_PKEY_encrypt_init(pctx) <= 0)
160                 goto err;
161
162         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
163                                 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
164                 {
165                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
166                 goto err;
167                 }
168
169         if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
170                 goto err;
171
172         ek = OPENSSL_malloc(eklen);
173
174         if (ek == NULL)
175                 {
176                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
177                 goto err;
178                 }
179
180         if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
181                 goto err;
182
183         ASN1_STRING_set0(ri->enc_key, ek, eklen);
184         ek = NULL;
185
186         ret = 1;
187
188         err:
189         if (pkey)
190                 EVP_PKEY_free(pkey);
191         if (pctx)
192                 EVP_PKEY_CTX_free(pctx);
193         if (ek)
194                 OPENSSL_free(ek);
195         return ret;
196
197         }
198
199
200 int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
201                         PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
202         {
203         EVP_PKEY_CTX *pctx = NULL;
204         unsigned char *ek = NULL;
205         int eklen;
206
207         int ret = 0;
208
209         pctx = EVP_PKEY_CTX_new(pkey, NULL);
210         if (!pctx)
211                 return 0;
212
213         if (EVP_PKEY_decrypt_init(pctx) <= 0)
214                 goto err;
215
216         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
217                                 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
218                 {
219                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
220                 goto err;
221                 }
222
223         if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
224                                 ri->enc_key->data, ri->enc_key->length) <= 0)
225                 goto err;
226
227         ek = OPENSSL_malloc(eklen);
228
229         if (ek == NULL)
230                 {
231                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
232                 goto err;
233                 }
234
235         if (EVP_PKEY_decrypt(pctx, ek, &eklen,
236                                 ri->enc_key->data, ri->enc_key->length) <= 0)
237                 {
238                 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
239                 goto err;
240                 }
241
242         ret = 1;
243
244         *pek = ek;
245         *peklen = eklen;
246
247         err:
248         if (pctx)
249                 EVP_PKEY_CTX_free(pctx);
250         if (!ret && ek)
251                 OPENSSL_free(ek);
252
253         return ret;
254         }
255
256 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
257         {
258         int i;
259         BIO *out=NULL,*btmp=NULL;
260         X509_ALGOR *xa = NULL;
261         const EVP_CIPHER *evp_cipher=NULL;
262         STACK_OF(X509_ALGOR) *md_sk=NULL;
263         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
264         X509_ALGOR *xalg=NULL;
265         PKCS7_RECIP_INFO *ri=NULL;
266         ASN1_OCTET_STRING *os=NULL;
267
268         i=OBJ_obj2nid(p7->type);
269         p7->state=PKCS7_S_HEADER;
270
271         switch (i)
272                 {
273         case NID_pkcs7_signed:
274                 md_sk=p7->d.sign->md_algs;
275                 os = PKCS7_get_octet_string(p7->d.sign->contents);
276                 break;
277         case NID_pkcs7_signedAndEnveloped:
278                 rsk=p7->d.signed_and_enveloped->recipientinfo;
279                 md_sk=p7->d.signed_and_enveloped->md_algs;
280                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
281                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
282                 if (evp_cipher == NULL)
283                         {
284                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
285                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
286                         goto err;
287                         }
288                 break;
289         case NID_pkcs7_enveloped:
290                 rsk=p7->d.enveloped->recipientinfo;
291                 xalg=p7->d.enveloped->enc_data->algorithm;
292                 evp_cipher=p7->d.enveloped->enc_data->cipher;
293                 if (evp_cipher == NULL)
294                         {
295                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
296                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
297                         goto err;
298                         }
299                 break;
300         case NID_pkcs7_digest:
301                 xa = p7->d.digest->md;
302                 os = PKCS7_get_octet_string(p7->d.digest->contents);
303                 break;
304         default:
305                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
306                 goto err;
307                 }
308
309         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
310                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
311                         goto err;
312
313         if (xa && !PKCS7_bio_add_digest(&out, xa))
314                         goto err;
315
316         if (evp_cipher != NULL)
317                 {
318                 unsigned char key[EVP_MAX_KEY_LENGTH];
319                 unsigned char iv[EVP_MAX_IV_LENGTH];
320                 int keylen,ivlen;
321                 EVP_CIPHER_CTX *ctx;
322
323                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
324                         {
325                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
326                         goto err;
327                         }
328                 BIO_get_cipher_ctx(btmp, &ctx);
329                 keylen=EVP_CIPHER_key_length(evp_cipher);
330                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
331                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
332                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
333                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
334                         goto err;
335                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
336                         goto err;
337                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
338                         goto err;
339
340                 if (ivlen > 0) {
341                         if (xalg->parameter == NULL) 
342                                                 xalg->parameter=ASN1_TYPE_new();
343                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
344                                                                        goto err;
345                 }
346
347                 /* Lets do the pub key stuff :-) */
348                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
349                         {
350                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
351                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
352                                 goto err;
353                         }
354                 OPENSSL_cleanse(key, keylen);
355
356                 if (out == NULL)
357                         out=btmp;
358                 else
359                         BIO_push(out,btmp);
360                 btmp=NULL;
361                 }
362
363         if (bio == NULL)
364                 {
365                 if (PKCS7_is_detached(p7))
366                         bio=BIO_new(BIO_s_null());
367                 else if (os && os->length > 0)
368                         bio = BIO_new_mem_buf(os->data, os->length);
369                 if(bio == NULL)
370                         {
371                         bio=BIO_new(BIO_s_mem());
372                         BIO_set_mem_eof_return(bio,0);
373                         }
374                 }
375         BIO_push(out,bio);
376         bio=NULL;
377         if (0)
378                 {
379 err:
380                 if (out != NULL)
381                         BIO_free_all(out);
382                 if (btmp != NULL)
383                         BIO_free_all(btmp);
384                 out=NULL;
385                 }
386         return(out);
387         }
388
389 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
390         {
391         int ret;
392         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
393                                 pcert->cert_info->issuer);
394         if (ret)
395                 return ret;
396         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
397                                         ri->issuer_and_serial->serial);
398         }
399
400 /* int */
401 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
402         {
403         int i,j;
404         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
405         X509_ALGOR *xa;
406         ASN1_OCTET_STRING *data_body=NULL;
407         const EVP_MD *evp_md;
408         const EVP_CIPHER *evp_cipher=NULL;
409         EVP_CIPHER_CTX *evp_ctx=NULL;
410         X509_ALGOR *enc_alg=NULL;
411         STACK_OF(X509_ALGOR) *md_sk=NULL;
412         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
413         X509_ALGOR *xalg=NULL;
414         PKCS7_RECIP_INFO *ri=NULL;
415
416         i=OBJ_obj2nid(p7->type);
417         p7->state=PKCS7_S_HEADER;
418
419         switch (i)
420                 {
421         case NID_pkcs7_signed:
422                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
423                 md_sk=p7->d.sign->md_algs;
424                 break;
425         case NID_pkcs7_signedAndEnveloped:
426                 rsk=p7->d.signed_and_enveloped->recipientinfo;
427                 md_sk=p7->d.signed_and_enveloped->md_algs;
428                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
429                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
430                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
431                 if (evp_cipher == NULL)
432                         {
433                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
434                         goto err;
435                         }
436                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
437                 break;
438         case NID_pkcs7_enveloped:
439                 rsk=p7->d.enveloped->recipientinfo;
440                 enc_alg=p7->d.enveloped->enc_data->algorithm;
441                 data_body=p7->d.enveloped->enc_data->enc_data;
442                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
443                 if (evp_cipher == NULL)
444                         {
445                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
446                         goto err;
447                         }
448                 xalg=p7->d.enveloped->enc_data->algorithm;
449                 break;
450         default:
451                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
452                 goto err;
453                 }
454
455         /* We will be checking the signature */
456         if (md_sk != NULL)
457                 {
458                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
459                         {
460                         xa=sk_X509_ALGOR_value(md_sk,i);
461                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
462                                 {
463                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
464                                 goto err;
465                                 }
466
467                         j=OBJ_obj2nid(xa->algorithm);
468                         evp_md=EVP_get_digestbynid(j);
469                         if (evp_md == NULL)
470                                 {
471                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
472                                 goto err;
473                                 }
474
475                         BIO_set_md(btmp,evp_md);
476                         if (out == NULL)
477                                 out=btmp;
478                         else
479                                 BIO_push(out,btmp);
480                         btmp=NULL;
481                         }
482                 }
483
484         if (evp_cipher != NULL)
485                 {
486 #if 0
487                 unsigned char key[EVP_MAX_KEY_LENGTH];
488                 unsigned char iv[EVP_MAX_IV_LENGTH];
489                 unsigned char *p;
490                 int keylen,ivlen;
491                 int max;
492                 X509_OBJECT ret;
493 #endif
494                 unsigned char *ek = NULL;
495                 int eklen;
496
497                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
498                         {
499                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
500                         goto err;
501                         }
502
503                 /* It was encrypted, we need to decrypt the secret key
504                  * with the private key */
505
506                 /* Find the recipientInfo which matches the passed certificate
507                  * (if any)
508                  */
509
510                 if (pcert)
511                         {
512                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
513                                 {
514                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
515                                 if (!pkcs7_cmp_ri(ri, pcert))
516                                         break;
517                                 ri=NULL;
518                                 }
519                         if (ri == NULL)
520                                 {
521                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
522                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
523                                 goto err;
524                                 }
525                         }
526
527                 /* If we haven't got a certificate try each ri in turn */
528
529                 if (pcert == NULL)
530                         {
531                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
532                                 {
533                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
534                                 if (pkcs7_decrypt_rinfo(&ek, &eklen,
535                                                         ri, pkey) > 0)
536                                         break;
537                                 ERR_clear_error();
538                                 ri = NULL;
539                                 }
540                         if (ri == NULL)
541                                 {
542                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
543                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
544                                 goto err;
545                                 }
546                         }
547                 else
548                         {
549                         if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) <= 0)
550                                 goto err;
551                         }
552
553                 evp_ctx=NULL;
554                 BIO_get_cipher_ctx(etmp,&evp_ctx);
555                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
556                         goto err;
557                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
558                         goto err;
559
560                 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
561                         /* Some S/MIME clients don't use the same key
562                          * and effective key length. The key length is
563                          * determined by the size of the decrypted RSA key.
564                          */
565                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
566                                 {
567                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
568                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
569                                 goto err;
570                                 }
571                 } 
572                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
573                         goto err;
574
575                 if (ek)
576                         {
577                         OPENSSL_cleanse(ek,eklen);
578                         OPENSSL_free(ek);
579                         }
580
581                 if (out == NULL)
582                         out=etmp;
583                 else
584                         BIO_push(out,etmp);
585                 etmp=NULL;
586                 }
587
588 #if 1
589         if (PKCS7_is_detached(p7) || (in_bio != NULL))
590                 {
591                 bio=in_bio;
592                 }
593         else 
594                 {
595 #if 0
596                 bio=BIO_new(BIO_s_mem());
597                 /* We need to set this so that when we have read all
598                  * the data, the encrypt BIO, if present, will read
599                  * EOF and encode the last few bytes */
600                 BIO_set_mem_eof_return(bio,0);
601
602                 if (data_body->length > 0)
603                         BIO_write(bio,(char *)data_body->data,data_body->length);
604 #else
605                 if (data_body->length > 0)
606                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
607                 else {
608                         bio=BIO_new(BIO_s_mem());
609                         BIO_set_mem_eof_return(bio,0);
610                 }
611 #endif
612                 }
613         BIO_push(out,bio);
614         bio=NULL;
615 #endif
616         if (0)
617                 {
618 err:
619                 if (out != NULL) BIO_free_all(out);
620                 if (btmp != NULL) BIO_free_all(btmp);
621                 if (etmp != NULL) BIO_free_all(etmp);
622                 if (bio != NULL) BIO_free_all(bio);
623                 out=NULL;
624                 }
625         return(out);
626         }
627
628 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
629         {
630         for (;;)
631                 {
632                 bio=BIO_find_type(bio,BIO_TYPE_MD);
633                 if (bio == NULL)
634                         {
635                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
636                         return NULL;    
637                         }
638                 BIO_get_md_ctx(bio,pmd);
639                 if (*pmd == NULL)
640                         {
641                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
642                         return NULL;
643                         }       
644                 if (EVP_MD_CTX_type(*pmd) == nid)
645                         return bio;
646                 bio=BIO_next(bio);
647                 }
648         return NULL;
649         }
650
651 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
652         {
653         int ret=0;
654         int i,j;
655         BIO *btmp;
656         BUF_MEM *buf_mem=NULL;
657         BUF_MEM *buf=NULL;
658         PKCS7_SIGNER_INFO *si;
659         EVP_MD_CTX *mdc,ctx_tmp;
660         STACK_OF(X509_ATTRIBUTE) *sk;
661         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
662         ASN1_OCTET_STRING *os=NULL;
663
664         EVP_MD_CTX_init(&ctx_tmp);
665         i=OBJ_obj2nid(p7->type);
666         p7->state=PKCS7_S_HEADER;
667
668         switch (i)
669                 {
670         case NID_pkcs7_signedAndEnveloped:
671                 /* XXXXXXXXXXXXXXXX */
672                 si_sk=p7->d.signed_and_enveloped->signer_info;
673                 if (!(os=M_ASN1_OCTET_STRING_new()))
674                         {
675                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
676                         goto err;
677                         }
678                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
679                 break;
680         case NID_pkcs7_enveloped:
681                 /* XXXXXXXXXXXXXXXX */
682                 if (!(os=M_ASN1_OCTET_STRING_new()))
683                         {
684                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
685                         goto err;
686                         }
687                 p7->d.enveloped->enc_data->enc_data=os;
688                 break;
689         case NID_pkcs7_signed:
690                 si_sk=p7->d.sign->signer_info;
691                 os=PKCS7_get_octet_string(p7->d.sign->contents);
692                 /* If detached data then the content is excluded */
693                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
694                         M_ASN1_OCTET_STRING_free(os);
695                         p7->d.sign->contents->d.data = NULL;
696                 }
697                 break;
698
699         case NID_pkcs7_digest:
700                 os=PKCS7_get_octet_string(p7->d.digest->contents);
701                 /* If detached data then the content is excluded */
702                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
703                         {
704                         M_ASN1_OCTET_STRING_free(os);
705                         p7->d.digest->contents->d.data = NULL;
706                         }
707                 break;
708
709                 }
710
711         if (si_sk != NULL)
712                 {
713                 if ((buf=BUF_MEM_new()) == NULL)
714                         {
715                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
716                         goto err;
717                         }
718                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
719                         {
720                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
721                         if (si->pkey == NULL) continue;
722
723                         j=OBJ_obj2nid(si->digest_alg->algorithm);
724
725                         btmp=bio;
726
727                         btmp = PKCS7_find_digest(&mdc, btmp, j);
728
729                         if (btmp == NULL)
730                                 goto err;
731
732                         /* We now have the EVP_MD_CTX, lets do the
733                          * signing. */
734                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
735                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
736                                 {
737                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
738                                 goto err;
739                                 }
740
741                         sk=si->auth_attr;
742
743                         /* If there are attributes, we add the digest
744                          * attribute and only sign the attributes */
745                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
746                                 {
747                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
748                                 unsigned int md_len, alen;
749                                 ASN1_OCTET_STRING *digest;
750                                 ASN1_UTCTIME *sign_time;
751                                 const EVP_MD *md_tmp;
752
753                                 /* Add signing time if not already present */
754                                 if (!PKCS7_get_signed_attribute(si,
755                                                         NID_pkcs9_signingTime))
756                                         {
757                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
758                                                 {
759                                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
760                                                         ERR_R_MALLOC_FAILURE);
761                                                 goto err;
762                                                 }
763                                         PKCS7_add_signed_attribute(si,
764                                                 NID_pkcs9_signingTime,
765                                                 V_ASN1_UTCTIME,sign_time);
766                                         }
767
768                                 /* Add digest */
769                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
770                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
771                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
772                                         {
773                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
774                                                 ERR_R_MALLOC_FAILURE);
775                                         goto err;
776                                         }
777                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
778                                                                 md_len))
779                                         {
780                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
781                                                 ERR_R_MALLOC_FAILURE);
782                                         goto err;
783                                         }
784                                 PKCS7_add_signed_attribute(si,
785                                         NID_pkcs9_messageDigest,
786                                         V_ASN1_OCTET_STRING,digest);
787
788                                 /* Now sign the attributes */
789                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
790                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
791                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
792                                 if(!abuf) goto err;
793                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
794                                 OPENSSL_free(abuf);
795                                 }
796
797                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
798                                 (unsigned int *)&buf->length,si->pkey))
799                                 {
800                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
801                                 goto err;
802                                 }
803                         if (!ASN1_STRING_set(si->enc_digest,
804                                 (unsigned char *)buf->data,buf->length))
805                                 {
806                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
807                                 goto err;
808                                 }
809                         }
810                 }
811         else if (i == NID_pkcs7_digest)
812                 {
813                 unsigned char md_data[EVP_MAX_MD_SIZE];
814                 unsigned int md_len;
815                 if (!PKCS7_find_digest(&mdc, bio,
816                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
817                         goto err;
818                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
819                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
820                 }
821
822         if (!PKCS7_is_detached(p7))
823                 {
824                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
825                 if (btmp == NULL)
826                         {
827                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
828                         goto err;
829                         }
830                 BIO_get_mem_ptr(btmp,&buf_mem);
831                 /* Mark the BIO read only then we can use its copy of the data
832                  * instead of making an extra copy.
833                  */
834                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
835                 BIO_set_mem_eof_return(btmp, 0);
836                 os->data = (unsigned char *)buf_mem->data;
837                 os->length = buf_mem->length;
838 #if 0
839                 M_ASN1_OCTET_STRING_set(os,
840                         (unsigned char *)buf_mem->data,buf_mem->length);
841 #endif
842                 }
843         ret=1;
844 err:
845         EVP_MD_CTX_cleanup(&ctx_tmp);
846         if (buf != NULL) BUF_MEM_free(buf);
847         return(ret);
848         }
849
850 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
851              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
852         {
853         PKCS7_ISSUER_AND_SERIAL *ias;
854         int ret=0,i;
855         STACK_OF(X509) *cert;
856         X509 *x509;
857
858         if (PKCS7_type_is_signed(p7))
859                 {
860                 cert=p7->d.sign->cert;
861                 }
862         else if (PKCS7_type_is_signedAndEnveloped(p7))
863                 {
864                 cert=p7->d.signed_and_enveloped->cert;
865                 }
866         else
867                 {
868                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
869                 goto err;
870                 }
871         /* XXXXXXXXXXXXXXXXXXXXXXX */
872         ias=si->issuer_and_serial;
873
874         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
875
876         /* were we able to find the cert in passed to us */
877         if (x509 == NULL)
878                 {
879                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
880                 goto err;
881                 }
882
883         /* Lets verify */
884         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
885                 {
886                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
887                 goto err;
888                 }
889         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
890         i=X509_verify_cert(ctx);
891         if (i <= 0) 
892                 {
893                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
894                 X509_STORE_CTX_cleanup(ctx);
895                 goto err;
896                 }
897         X509_STORE_CTX_cleanup(ctx);
898
899         return PKCS7_signatureVerify(bio, p7, si, x509);
900         err:
901         return ret;
902         }
903
904 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
905                                                                 X509 *x509)
906         {
907         ASN1_OCTET_STRING *os;
908         EVP_MD_CTX mdc_tmp,*mdc;
909         int ret=0,i;
910         int md_type;
911         STACK_OF(X509_ATTRIBUTE) *sk;
912         BIO *btmp;
913         EVP_PKEY *pkey;
914
915         EVP_MD_CTX_init(&mdc_tmp);
916
917         if (!PKCS7_type_is_signed(p7) && 
918                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
919                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
920                                                 PKCS7_R_WRONG_PKCS7_TYPE);
921                 goto err;
922         }
923
924         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
925
926         btmp=bio;
927         for (;;)
928                 {
929                 if ((btmp == NULL) ||
930                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
931                         {
932                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
933                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
934                         goto err;
935                         }
936                 BIO_get_md_ctx(btmp,&mdc);
937                 if (mdc == NULL)
938                         {
939                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
940                                                         ERR_R_INTERNAL_ERROR);
941                         goto err;
942                         }
943                 if (EVP_MD_CTX_type(mdc) == md_type)
944                         break;
945                 /* Workaround for some broken clients that put the signature
946                  * OID instead of the digest OID in digest_alg->algorithm
947                  */
948                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
949                         break;
950                 btmp=BIO_next(btmp);
951                 }
952
953         /* mdc is the digest ctx that we want, unless there are attributes,
954          * in which case the digest is the signed attributes */
955         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
956
957         sk=si->auth_attr;
958         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
959                 {
960                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
961                 unsigned int md_len, alen;
962                 ASN1_OCTET_STRING *message_digest;
963
964                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
965                 message_digest=PKCS7_digest_from_attributes(sk);
966                 if (!message_digest)
967                         {
968                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
969                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
970                         goto err;
971                         }
972                 if ((message_digest->length != (int)md_len) ||
973                         (memcmp(message_digest->data,md_dat,md_len)))
974                         {
975 #if 0
976 {
977 int ii;
978 for (ii=0; ii<message_digest->length; ii++)
979         printf("%02X",message_digest->data[ii]); printf(" sent\n");
980 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
981 }
982 #endif
983                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
984                                                         PKCS7_R_DIGEST_FAILURE);
985                         ret= -1;
986                         goto err;
987                         }
988
989                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
990
991                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
992                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
993                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
994
995                 OPENSSL_free(abuf);
996                 }
997
998         os=si->enc_digest;
999         pkey = X509_get_pubkey(x509);
1000         if (!pkey)
1001                 {
1002                 ret = -1;
1003                 goto err;
1004                 }
1005
1006         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1007         EVP_PKEY_free(pkey);
1008         if (i <= 0)
1009                 {
1010                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1011                                                 PKCS7_R_SIGNATURE_FAILURE);
1012                 ret= -1;
1013                 goto err;
1014                 }
1015         else
1016                 ret=1;
1017 err:
1018         EVP_MD_CTX_cleanup(&mdc_tmp);
1019         return(ret);
1020         }
1021
1022 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1023         {
1024         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1025         PKCS7_RECIP_INFO *ri;
1026         int i;
1027
1028         i=OBJ_obj2nid(p7->type);
1029         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
1030         rsk=p7->d.signed_and_enveloped->recipientinfo;
1031         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1032         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1033         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1034         return(ri->issuer_and_serial);
1035         }
1036
1037 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1038         {
1039         return(get_attribute(si->auth_attr,nid));
1040         }
1041
1042 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1043         {
1044         return(get_attribute(si->unauth_attr,nid));
1045         }
1046
1047 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1048         {
1049         int i;
1050         X509_ATTRIBUTE *xa;
1051         ASN1_OBJECT *o;
1052
1053         o=OBJ_nid2obj(nid);
1054         if (!o || !sk) return(NULL);
1055         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1056                 {
1057                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1058                 if (OBJ_cmp(xa->object,o) == 0)
1059                         {
1060                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1061                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1062                         else
1063                                 return(NULL);
1064                         }
1065                 }
1066         return(NULL);
1067         }
1068
1069 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1070 {
1071         ASN1_TYPE *astype;
1072         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1073         return astype->value.octet_string;
1074 }
1075
1076 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1077                                 STACK_OF(X509_ATTRIBUTE) *sk)
1078         {
1079         int i;
1080
1081         if (p7si->auth_attr != NULL)
1082                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1083         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1084         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1085                 {
1086                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1087                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1088                     == NULL)
1089                         return(0);
1090                 }
1091         return(1);
1092         }
1093
1094 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1095         {
1096         int i;
1097
1098         if (p7si->unauth_attr != NULL)
1099                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1100                                            X509_ATTRIBUTE_free);
1101         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1102         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1103                 {
1104                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1105                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1106                     == NULL)
1107                         return(0);
1108                 }
1109         return(1);
1110         }
1111
1112 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1113              void *value)
1114         {
1115         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1116         }
1117
1118 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1119              void *value)
1120         {
1121         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1122         }
1123
1124 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1125                          void *value)
1126         {
1127         X509_ATTRIBUTE *attr=NULL;
1128
1129         if (*sk == NULL)
1130                 {
1131                 *sk = sk_X509_ATTRIBUTE_new_null();
1132 new_attrib:
1133                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1134                 sk_X509_ATTRIBUTE_push(*sk,attr);
1135                 }
1136         else
1137                 {
1138                 int i;
1139
1140                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1141                         {
1142                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1143                         if (OBJ_obj2nid(attr->object) == nid)
1144                                 {
1145                                 X509_ATTRIBUTE_free(attr);
1146                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1147                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1148                                 goto end;
1149                                 }
1150                         }
1151                 goto new_attrib;
1152                 }
1153 end:
1154         return(1);
1155         }
1156