Update PKCS#7 enveloped data to new API.
[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
201 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
202         {
203         int i;
204         BIO *out=NULL,*btmp=NULL;
205         X509_ALGOR *xa = NULL;
206         const EVP_CIPHER *evp_cipher=NULL;
207         STACK_OF(X509_ALGOR) *md_sk=NULL;
208         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
209         X509_ALGOR *xalg=NULL;
210         PKCS7_RECIP_INFO *ri=NULL;
211         ASN1_OCTET_STRING *os=NULL;
212
213         i=OBJ_obj2nid(p7->type);
214         p7->state=PKCS7_S_HEADER;
215
216         switch (i)
217                 {
218         case NID_pkcs7_signed:
219                 md_sk=p7->d.sign->md_algs;
220                 os = PKCS7_get_octet_string(p7->d.sign->contents);
221                 break;
222         case NID_pkcs7_signedAndEnveloped:
223                 rsk=p7->d.signed_and_enveloped->recipientinfo;
224                 md_sk=p7->d.signed_and_enveloped->md_algs;
225                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
226                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
227                 if (evp_cipher == NULL)
228                         {
229                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
230                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
231                         goto err;
232                         }
233                 break;
234         case NID_pkcs7_enveloped:
235                 rsk=p7->d.enveloped->recipientinfo;
236                 xalg=p7->d.enveloped->enc_data->algorithm;
237                 evp_cipher=p7->d.enveloped->enc_data->cipher;
238                 if (evp_cipher == NULL)
239                         {
240                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
241                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
242                         goto err;
243                         }
244                 break;
245         case NID_pkcs7_digest:
246                 xa = p7->d.digest->md;
247                 os = PKCS7_get_octet_string(p7->d.digest->contents);
248                 break;
249         default:
250                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
251                 goto err;
252                 }
253
254         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
255                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
256                         goto err;
257
258         if (xa && !PKCS7_bio_add_digest(&out, xa))
259                         goto err;
260
261         if (evp_cipher != NULL)
262                 {
263                 unsigned char key[EVP_MAX_KEY_LENGTH];
264                 unsigned char iv[EVP_MAX_IV_LENGTH];
265                 int keylen,ivlen;
266                 EVP_CIPHER_CTX *ctx;
267
268                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
269                         {
270                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
271                         goto err;
272                         }
273                 BIO_get_cipher_ctx(btmp, &ctx);
274                 keylen=EVP_CIPHER_key_length(evp_cipher);
275                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
276                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
277                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
278                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
279                         goto err;
280                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
281                         goto err;
282                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
283                         goto err;
284
285                 if (ivlen > 0) {
286                         if (xalg->parameter == NULL) 
287                                                 xalg->parameter=ASN1_TYPE_new();
288                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
289                                                                        goto err;
290                 }
291
292                 /* Lets do the pub key stuff :-) */
293                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
294                         {
295                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
296                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
297                                 goto err;
298                         }
299                 OPENSSL_cleanse(key, keylen);
300
301                 if (out == NULL)
302                         out=btmp;
303                 else
304                         BIO_push(out,btmp);
305                 btmp=NULL;
306                 }
307
308         if (bio == NULL)
309                 {
310                 if (PKCS7_is_detached(p7))
311                         bio=BIO_new(BIO_s_null());
312                 else if (os && os->length > 0)
313                         bio = BIO_new_mem_buf(os->data, os->length);
314                 if(bio == NULL)
315                         {
316                         bio=BIO_new(BIO_s_mem());
317                         BIO_set_mem_eof_return(bio,0);
318                         }
319                 }
320         BIO_push(out,bio);
321         bio=NULL;
322         if (0)
323                 {
324 err:
325                 if (out != NULL)
326                         BIO_free_all(out);
327                 if (btmp != NULL)
328                         BIO_free_all(btmp);
329                 out=NULL;
330                 }
331         return(out);
332         }
333
334 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
335         {
336         int ret;
337         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
338                                 pcert->cert_info->issuer);
339         if (ret)
340                 return ret;
341         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
342                                         ri->issuer_and_serial->serial);
343         }
344
345 /* int */
346 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
347         {
348         int i,j;
349         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
350         unsigned char *tmp=NULL;
351         X509_ALGOR *xa;
352         ASN1_OCTET_STRING *data_body=NULL;
353         const EVP_MD *evp_md;
354         const EVP_CIPHER *evp_cipher=NULL;
355         EVP_CIPHER_CTX *evp_ctx=NULL;
356         X509_ALGOR *enc_alg=NULL;
357         STACK_OF(X509_ALGOR) *md_sk=NULL;
358         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
359         X509_ALGOR *xalg=NULL;
360         PKCS7_RECIP_INFO *ri=NULL;
361
362         i=OBJ_obj2nid(p7->type);
363         p7->state=PKCS7_S_HEADER;
364
365         switch (i)
366                 {
367         case NID_pkcs7_signed:
368                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
369                 md_sk=p7->d.sign->md_algs;
370                 break;
371         case NID_pkcs7_signedAndEnveloped:
372                 rsk=p7->d.signed_and_enveloped->recipientinfo;
373                 md_sk=p7->d.signed_and_enveloped->md_algs;
374                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
375                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
376                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
377                 if (evp_cipher == NULL)
378                         {
379                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
380                         goto err;
381                         }
382                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
383                 break;
384         case NID_pkcs7_enveloped:
385                 rsk=p7->d.enveloped->recipientinfo;
386                 enc_alg=p7->d.enveloped->enc_data->algorithm;
387                 data_body=p7->d.enveloped->enc_data->enc_data;
388                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
389                 if (evp_cipher == NULL)
390                         {
391                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
392                         goto err;
393                         }
394                 xalg=p7->d.enveloped->enc_data->algorithm;
395                 break;
396         default:
397                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
398                 goto err;
399                 }
400
401         /* We will be checking the signature */
402         if (md_sk != NULL)
403                 {
404                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
405                         {
406                         xa=sk_X509_ALGOR_value(md_sk,i);
407                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
408                                 {
409                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
410                                 goto err;
411                                 }
412
413                         j=OBJ_obj2nid(xa->algorithm);
414                         evp_md=EVP_get_digestbynid(j);
415                         if (evp_md == NULL)
416                                 {
417                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
418                                 goto err;
419                                 }
420
421                         BIO_set_md(btmp,evp_md);
422                         if (out == NULL)
423                                 out=btmp;
424                         else
425                                 BIO_push(out,btmp);
426                         btmp=NULL;
427                         }
428                 }
429
430         if (evp_cipher != NULL)
431                 {
432 #if 0
433                 unsigned char key[EVP_MAX_KEY_LENGTH];
434                 unsigned char iv[EVP_MAX_IV_LENGTH];
435                 unsigned char *p;
436                 int keylen,ivlen;
437                 int max;
438                 X509_OBJECT ret;
439 #endif
440                 int jj;
441
442                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
443                         {
444                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
445                         goto err;
446                         }
447
448                 /* It was encrypted, we need to decrypt the secret key
449                  * with the private key */
450
451                 /* Find the recipientInfo which matches the passed certificate
452                  * (if any)
453                  */
454
455                 if (pcert) {
456                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
457                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
458                                 if (!pkcs7_cmp_ri(ri, pcert))
459                                         break;
460                                 ri=NULL;
461                         }
462                         if (ri == NULL) {
463                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
464                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
465                                 goto err;
466                         }
467                 }
468
469                 jj=EVP_PKEY_size(pkey);
470                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
471                 if (tmp == NULL)
472                         {
473                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
474                         goto err;
475                         }
476
477                 /* If we haven't got a certificate try each ri in turn */
478
479                 if (pcert == NULL)
480                         {
481                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
482                                 {
483                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
484                                 jj=EVP_PKEY_decrypt_old(tmp,
485                                         M_ASN1_STRING_data(ri->enc_key),
486                                         M_ASN1_STRING_length(ri->enc_key),
487                                                 pkey);
488                                 if (jj > 0)
489                                         break;
490                                 ERR_clear_error();
491                                 ri = NULL;
492                                 }
493                         if (ri == NULL)
494                                 {
495                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
496                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
497                                 goto err;
498                                 }
499                         }
500                 else
501                         {
502                         jj=EVP_PKEY_decrypt_old(tmp,
503                                 M_ASN1_STRING_data(ri->enc_key),
504                                 M_ASN1_STRING_length(ri->enc_key), pkey);
505                         if (jj <= 0)
506                                 {
507                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
508                                                                 ERR_R_EVP_LIB);
509                                 goto err;
510                                 }
511                         }
512
513                 evp_ctx=NULL;
514                 BIO_get_cipher_ctx(etmp,&evp_ctx);
515                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
516                         goto err;
517                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
518                         goto err;
519
520                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
521                         /* Some S/MIME clients don't use the same key
522                          * and effective key length. The key length is
523                          * determined by the size of the decrypted RSA key.
524                          */
525                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
526                                 {
527                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
528                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
529                                 goto err;
530                                 }
531                 } 
532                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
533                         goto err;
534
535                 OPENSSL_cleanse(tmp,jj);
536
537                 if (out == NULL)
538                         out=etmp;
539                 else
540                         BIO_push(out,etmp);
541                 etmp=NULL;
542                 }
543
544 #if 1
545         if (PKCS7_is_detached(p7) || (in_bio != NULL))
546                 {
547                 bio=in_bio;
548                 }
549         else 
550                 {
551 #if 0
552                 bio=BIO_new(BIO_s_mem());
553                 /* We need to set this so that when we have read all
554                  * the data, the encrypt BIO, if present, will read
555                  * EOF and encode the last few bytes */
556                 BIO_set_mem_eof_return(bio,0);
557
558                 if (data_body->length > 0)
559                         BIO_write(bio,(char *)data_body->data,data_body->length);
560 #else
561                 if (data_body->length > 0)
562                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
563                 else {
564                         bio=BIO_new(BIO_s_mem());
565                         BIO_set_mem_eof_return(bio,0);
566                 }
567 #endif
568                 }
569         BIO_push(out,bio);
570         bio=NULL;
571 #endif
572         if (0)
573                 {
574 err:
575                 if (out != NULL) BIO_free_all(out);
576                 if (btmp != NULL) BIO_free_all(btmp);
577                 if (etmp != NULL) BIO_free_all(etmp);
578                 if (bio != NULL) BIO_free_all(bio);
579                 out=NULL;
580                 }
581         if (tmp != NULL)
582                 OPENSSL_free(tmp);
583         return(out);
584         }
585
586 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
587         {
588         for (;;)
589                 {
590                 bio=BIO_find_type(bio,BIO_TYPE_MD);
591                 if (bio == NULL)
592                         {
593                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
594                         return NULL;    
595                         }
596                 BIO_get_md_ctx(bio,pmd);
597                 if (*pmd == NULL)
598                         {
599                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
600                         return NULL;
601                         }       
602                 if (EVP_MD_CTX_type(*pmd) == nid)
603                         return bio;
604                 bio=BIO_next(bio);
605                 }
606         return NULL;
607         }
608
609 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
610         {
611         int ret=0;
612         int i,j;
613         BIO *btmp;
614         BUF_MEM *buf_mem=NULL;
615         BUF_MEM *buf=NULL;
616         PKCS7_SIGNER_INFO *si;
617         EVP_MD_CTX *mdc,ctx_tmp;
618         STACK_OF(X509_ATTRIBUTE) *sk;
619         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
620         ASN1_OCTET_STRING *os=NULL;
621
622         EVP_MD_CTX_init(&ctx_tmp);
623         i=OBJ_obj2nid(p7->type);
624         p7->state=PKCS7_S_HEADER;
625
626         switch (i)
627                 {
628         case NID_pkcs7_signedAndEnveloped:
629                 /* XXXXXXXXXXXXXXXX */
630                 si_sk=p7->d.signed_and_enveloped->signer_info;
631                 if (!(os=M_ASN1_OCTET_STRING_new()))
632                         {
633                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
634                         goto err;
635                         }
636                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
637                 break;
638         case NID_pkcs7_enveloped:
639                 /* XXXXXXXXXXXXXXXX */
640                 if (!(os=M_ASN1_OCTET_STRING_new()))
641                         {
642                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
643                         goto err;
644                         }
645                 p7->d.enveloped->enc_data->enc_data=os;
646                 break;
647         case NID_pkcs7_signed:
648                 si_sk=p7->d.sign->signer_info;
649                 os=PKCS7_get_octet_string(p7->d.sign->contents);
650                 /* If detached data then the content is excluded */
651                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
652                         M_ASN1_OCTET_STRING_free(os);
653                         p7->d.sign->contents->d.data = NULL;
654                 }
655                 break;
656
657         case NID_pkcs7_digest:
658                 os=PKCS7_get_octet_string(p7->d.digest->contents);
659                 /* If detached data then the content is excluded */
660                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
661                         {
662                         M_ASN1_OCTET_STRING_free(os);
663                         p7->d.digest->contents->d.data = NULL;
664                         }
665                 break;
666
667                 }
668
669         if (si_sk != NULL)
670                 {
671                 if ((buf=BUF_MEM_new()) == NULL)
672                         {
673                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
674                         goto err;
675                         }
676                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
677                         {
678                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
679                         if (si->pkey == NULL) continue;
680
681                         j=OBJ_obj2nid(si->digest_alg->algorithm);
682
683                         btmp=bio;
684
685                         btmp = PKCS7_find_digest(&mdc, btmp, j);
686
687                         if (btmp == NULL)
688                                 goto err;
689
690                         /* We now have the EVP_MD_CTX, lets do the
691                          * signing. */
692                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
693                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
694                                 {
695                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
696                                 goto err;
697                                 }
698
699                         sk=si->auth_attr;
700
701                         /* If there are attributes, we add the digest
702                          * attribute and only sign the attributes */
703                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
704                                 {
705                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
706                                 unsigned int md_len, alen;
707                                 ASN1_OCTET_STRING *digest;
708                                 ASN1_UTCTIME *sign_time;
709                                 const EVP_MD *md_tmp;
710
711                                 /* Add signing time if not already present */
712                                 if (!PKCS7_get_signed_attribute(si,
713                                                         NID_pkcs9_signingTime))
714                                         {
715                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
716                                                 {
717                                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
718                                                         ERR_R_MALLOC_FAILURE);
719                                                 goto err;
720                                                 }
721                                         PKCS7_add_signed_attribute(si,
722                                                 NID_pkcs9_signingTime,
723                                                 V_ASN1_UTCTIME,sign_time);
724                                         }
725
726                                 /* Add digest */
727                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
728                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
729                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
730                                         {
731                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
732                                                 ERR_R_MALLOC_FAILURE);
733                                         goto err;
734                                         }
735                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
736                                                                 md_len))
737                                         {
738                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
739                                                 ERR_R_MALLOC_FAILURE);
740                                         goto err;
741                                         }
742                                 PKCS7_add_signed_attribute(si,
743                                         NID_pkcs9_messageDigest,
744                                         V_ASN1_OCTET_STRING,digest);
745
746                                 /* Now sign the attributes */
747                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
748                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
749                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
750                                 if(!abuf) goto err;
751                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
752                                 OPENSSL_free(abuf);
753                                 }
754
755 #ifndef OPENSSL_NO_DSA
756                         if (si->pkey->type == EVP_PKEY_DSA)
757                                 ctx_tmp.digest=EVP_dss1();
758 #endif
759 #ifndef OPENSSL_NO_ECDSA
760                         if (si->pkey->type == EVP_PKEY_EC)
761                                 ctx_tmp.digest=EVP_ecdsa();
762 #endif
763
764                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
765                                 (unsigned int *)&buf->length,si->pkey))
766                                 {
767                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
768                                 goto err;
769                                 }
770                         if (!ASN1_STRING_set(si->enc_digest,
771                                 (unsigned char *)buf->data,buf->length))
772                                 {
773                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
774                                 goto err;
775                                 }
776                         }
777                 }
778         else if (i == NID_pkcs7_digest)
779                 {
780                 unsigned char md_data[EVP_MAX_MD_SIZE];
781                 unsigned int md_len;
782                 if (!PKCS7_find_digest(&mdc, bio,
783                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
784                         goto err;
785                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
786                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
787                 }
788
789         if (!PKCS7_is_detached(p7))
790                 {
791                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
792                 if (btmp == NULL)
793                         {
794                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
795                         goto err;
796                         }
797                 BIO_get_mem_ptr(btmp,&buf_mem);
798                 /* Mark the BIO read only then we can use its copy of the data
799                  * instead of making an extra copy.
800                  */
801                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
802                 BIO_set_mem_eof_return(btmp, 0);
803                 os->data = (unsigned char *)buf_mem->data;
804                 os->length = buf_mem->length;
805 #if 0
806                 M_ASN1_OCTET_STRING_set(os,
807                         (unsigned char *)buf_mem->data,buf_mem->length);
808 #endif
809                 }
810         ret=1;
811 err:
812         EVP_MD_CTX_cleanup(&ctx_tmp);
813         if (buf != NULL) BUF_MEM_free(buf);
814         return(ret);
815         }
816
817 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
818              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
819         {
820         PKCS7_ISSUER_AND_SERIAL *ias;
821         int ret=0,i;
822         STACK_OF(X509) *cert;
823         X509 *x509;
824
825         if (PKCS7_type_is_signed(p7))
826                 {
827                 cert=p7->d.sign->cert;
828                 }
829         else if (PKCS7_type_is_signedAndEnveloped(p7))
830                 {
831                 cert=p7->d.signed_and_enveloped->cert;
832                 }
833         else
834                 {
835                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
836                 goto err;
837                 }
838         /* XXXXXXXXXXXXXXXXXXXXXXX */
839         ias=si->issuer_and_serial;
840
841         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
842
843         /* were we able to find the cert in passed to us */
844         if (x509 == NULL)
845                 {
846                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
847                 goto err;
848                 }
849
850         /* Lets verify */
851         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
852                 {
853                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
854                 goto err;
855                 }
856         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
857         i=X509_verify_cert(ctx);
858         if (i <= 0) 
859                 {
860                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
861                 X509_STORE_CTX_cleanup(ctx);
862                 goto err;
863                 }
864         X509_STORE_CTX_cleanup(ctx);
865
866         return PKCS7_signatureVerify(bio, p7, si, x509);
867         err:
868         return ret;
869         }
870
871 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
872                                                                 X509 *x509)
873         {
874         ASN1_OCTET_STRING *os;
875         EVP_MD_CTX mdc_tmp,*mdc;
876         int ret=0,i;
877         int md_type;
878         STACK_OF(X509_ATTRIBUTE) *sk;
879         BIO *btmp;
880         EVP_PKEY *pkey;
881
882         EVP_MD_CTX_init(&mdc_tmp);
883
884         if (!PKCS7_type_is_signed(p7) && 
885                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
886                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
887                                                 PKCS7_R_WRONG_PKCS7_TYPE);
888                 goto err;
889         }
890
891         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
892
893         btmp=bio;
894         for (;;)
895                 {
896                 if ((btmp == NULL) ||
897                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
898                         {
899                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
900                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
901                         goto err;
902                         }
903                 BIO_get_md_ctx(btmp,&mdc);
904                 if (mdc == NULL)
905                         {
906                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
907                                                         ERR_R_INTERNAL_ERROR);
908                         goto err;
909                         }
910                 if (EVP_MD_CTX_type(mdc) == md_type)
911                         break;
912                 /* Workaround for some broken clients that put the signature
913                  * OID instead of the digest OID in digest_alg->algorithm
914                  */
915                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
916                         break;
917                 btmp=BIO_next(btmp);
918                 }
919
920         /* mdc is the digest ctx that we want, unless there are attributes,
921          * in which case the digest is the signed attributes */
922         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
923
924         sk=si->auth_attr;
925         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
926                 {
927                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
928                 unsigned int md_len, alen;
929                 ASN1_OCTET_STRING *message_digest;
930
931                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
932                 message_digest=PKCS7_digest_from_attributes(sk);
933                 if (!message_digest)
934                         {
935                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
936                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
937                         goto err;
938                         }
939                 if ((message_digest->length != (int)md_len) ||
940                         (memcmp(message_digest->data,md_dat,md_len)))
941                         {
942 #if 0
943 {
944 int ii;
945 for (ii=0; ii<message_digest->length; ii++)
946         printf("%02X",message_digest->data[ii]); printf(" sent\n");
947 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
948 }
949 #endif
950                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
951                                                         PKCS7_R_DIGEST_FAILURE);
952                         ret= -1;
953                         goto err;
954                         }
955
956                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
957
958                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
959                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
960                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
961
962                 OPENSSL_free(abuf);
963                 }
964
965         os=si->enc_digest;
966         pkey = X509_get_pubkey(x509);
967         if (!pkey)
968                 {
969                 ret = -1;
970                 goto err;
971                 }
972 #if 0
973 #ifndef OPENSSL_NO_DSA
974         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
975 #endif
976 #ifndef OPENSSL_NO_ECDSA
977         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
978 #endif
979 #endif
980
981         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
982         EVP_PKEY_free(pkey);
983         if (i <= 0)
984                 {
985                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
986                                                 PKCS7_R_SIGNATURE_FAILURE);
987                 ret= -1;
988                 goto err;
989                 }
990         else
991                 ret=1;
992 err:
993         EVP_MD_CTX_cleanup(&mdc_tmp);
994         return(ret);
995         }
996
997 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
998         {
999         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1000         PKCS7_RECIP_INFO *ri;
1001         int i;
1002
1003         i=OBJ_obj2nid(p7->type);
1004         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
1005         rsk=p7->d.signed_and_enveloped->recipientinfo;
1006         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1007         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1008         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1009         return(ri->issuer_and_serial);
1010         }
1011
1012 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1013         {
1014         return(get_attribute(si->auth_attr,nid));
1015         }
1016
1017 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1018         {
1019         return(get_attribute(si->unauth_attr,nid));
1020         }
1021
1022 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1023         {
1024         int i;
1025         X509_ATTRIBUTE *xa;
1026         ASN1_OBJECT *o;
1027
1028         o=OBJ_nid2obj(nid);
1029         if (!o || !sk) return(NULL);
1030         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1031                 {
1032                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1033                 if (OBJ_cmp(xa->object,o) == 0)
1034                         {
1035                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1036                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1037                         else
1038                                 return(NULL);
1039                         }
1040                 }
1041         return(NULL);
1042         }
1043
1044 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1045 {
1046         ASN1_TYPE *astype;
1047         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1048         return astype->value.octet_string;
1049 }
1050
1051 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1052                                 STACK_OF(X509_ATTRIBUTE) *sk)
1053         {
1054         int i;
1055
1056         if (p7si->auth_attr != NULL)
1057                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1058         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1059         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1060                 {
1061                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1062                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1063                     == NULL)
1064                         return(0);
1065                 }
1066         return(1);
1067         }
1068
1069 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1070         {
1071         int i;
1072
1073         if (p7si->unauth_attr != NULL)
1074                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1075                                            X509_ATTRIBUTE_free);
1076         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1077         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1078                 {
1079                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1080                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1081                     == NULL)
1082                         return(0);
1083                 }
1084         return(1);
1085         }
1086
1087 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1088              void *value)
1089         {
1090         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1091         }
1092
1093 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1094              void *value)
1095         {
1096         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1097         }
1098
1099 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1100                          void *value)
1101         {
1102         X509_ATTRIBUTE *attr=NULL;
1103
1104         if (*sk == NULL)
1105                 {
1106                 *sk = sk_X509_ATTRIBUTE_new_null();
1107 new_attrib:
1108                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1109                 sk_X509_ATTRIBUTE_push(*sk,attr);
1110                 }
1111         else
1112                 {
1113                 int i;
1114
1115                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1116                         {
1117                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1118                         if (OBJ_obj2nid(attr->object) == nid)
1119                                 {
1120                                 X509_ATTRIBUTE_free(attr);
1121                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1122                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1123                                 goto end;
1124                                 }
1125                         }
1126                 goto new_attrib;
1127                 }
1128 end:
1129         return(1);
1130         }
1131