Make things static that should be. Declare stuff in headers that should be.
[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         size_t 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 static 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         size_t 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 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
652         {
653         unsigned char md_data[EVP_MAX_MD_SIZE];
654         unsigned int md_len;
655
656         /* Add signing time if not already present */
657         if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
658                 {
659                 if (!PKCS7_add0_attrib_signing_time(si, NULL))
660                         {
661                         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
662                                         ERR_R_MALLOC_FAILURE);
663                         return 0;
664                         }
665                 }
666
667         /* Add digest */
668         EVP_DigestFinal_ex(mctx, md_data,&md_len);
669         if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
670                 {
671                 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
672                 return 0;
673                 }
674
675         /* Now sign the attributes */
676         if (!PKCS7_SIGNER_INFO_sign(si))
677                         return 0;
678
679         return 1;
680         }
681         
682                                 
683 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
684         {
685         int ret=0;
686         int i,j;
687         BIO *btmp;
688         PKCS7_SIGNER_INFO *si;
689         EVP_MD_CTX *mdc,ctx_tmp;
690         STACK_OF(X509_ATTRIBUTE) *sk;
691         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
692         ASN1_OCTET_STRING *os=NULL;
693
694         EVP_MD_CTX_init(&ctx_tmp);
695         i=OBJ_obj2nid(p7->type);
696         p7->state=PKCS7_S_HEADER;
697
698         switch (i)
699                 {
700         case NID_pkcs7_signedAndEnveloped:
701                 /* XXXXXXXXXXXXXXXX */
702                 si_sk=p7->d.signed_and_enveloped->signer_info;
703                 if (!(os=M_ASN1_OCTET_STRING_new()))
704                         {
705                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
706                         goto err;
707                         }
708                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
709                 break;
710         case NID_pkcs7_enveloped:
711                 /* XXXXXXXXXXXXXXXX */
712                 if (!(os=M_ASN1_OCTET_STRING_new()))
713                         {
714                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
715                         goto err;
716                         }
717                 p7->d.enveloped->enc_data->enc_data=os;
718                 break;
719         case NID_pkcs7_signed:
720                 si_sk=p7->d.sign->signer_info;
721                 os=PKCS7_get_octet_string(p7->d.sign->contents);
722                 /* If detached data then the content is excluded */
723                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
724                         M_ASN1_OCTET_STRING_free(os);
725                         p7->d.sign->contents->d.data = NULL;
726                 }
727                 break;
728
729         case NID_pkcs7_digest:
730                 os=PKCS7_get_octet_string(p7->d.digest->contents);
731                 /* If detached data then the content is excluded */
732                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
733                         {
734                         M_ASN1_OCTET_STRING_free(os);
735                         p7->d.digest->contents->d.data = NULL;
736                         }
737                 break;
738
739                 }
740
741         if (si_sk != NULL)
742                 {
743                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
744                         {
745                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
746                         if (si->pkey == NULL)
747                                 continue;
748
749                         j = OBJ_obj2nid(si->digest_alg->algorithm);
750
751                         btmp=bio;
752
753                         btmp = PKCS7_find_digest(&mdc, btmp, j);
754
755                         if (btmp == NULL)
756                                 goto err;
757
758                         /* We now have the EVP_MD_CTX, lets do the
759                          * signing. */
760                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
761
762                         sk=si->auth_attr;
763
764                         /* If there are attributes, we add the digest
765                          * attribute and only sign the attributes */
766                         if (sk_X509_ATTRIBUTE_num(sk) > 0)
767                                 {
768                                 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
769                                         goto err;
770                                 }
771                         else
772                                 {
773                                 unsigned char *abuf = NULL;
774                                 unsigned int abuflen;
775                                 abuflen = EVP_PKEY_size(si->pkey);
776                                 abuf = OPENSSL_malloc(abuflen);
777                                 if (!abuf)
778                                         goto err;
779
780                                 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
781                                                         si->pkey))
782                                         {
783                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
784                                                         ERR_R_EVP_LIB);
785                                         goto err;
786                                         }
787                                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
788                                 }
789                         }
790                 }
791         else if (i == NID_pkcs7_digest)
792                 {
793                 unsigned char md_data[EVP_MAX_MD_SIZE];
794                 unsigned int md_len;
795                 if (!PKCS7_find_digest(&mdc, bio,
796                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
797                         goto err;
798                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
799                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
800                 }
801
802         if (!PKCS7_is_detached(p7))
803                 {
804                 char *cont;
805                 long contlen;
806                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
807                 if (btmp == NULL)
808                         {
809                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
810                         goto err;
811                         }
812                 contlen = BIO_get_mem_data(btmp, &cont);
813                 /* Mark the BIO read only then we can use its copy of the data
814                  * instead of making an extra copy.
815                  */
816                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
817                 BIO_set_mem_eof_return(btmp, 0);
818                 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
819                 }
820         ret=1;
821 err:
822         EVP_MD_CTX_cleanup(&ctx_tmp);
823         return(ret);
824         }
825
826 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
827         {
828         EVP_MD_CTX mctx;
829         EVP_PKEY_CTX *pctx;
830         unsigned char *abuf = NULL;
831         int alen;
832         size_t siglen;
833         const EVP_MD *md = NULL;
834
835         md = EVP_get_digestbyobj(si->digest_alg->algorithm);
836         if (md == NULL)
837                 return 0;
838
839         EVP_MD_CTX_init(&mctx);
840         if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
841                 goto err;
842
843         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
844                                 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
845                 {
846                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
847                 goto err;
848                 }
849
850         alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
851                                 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
852         if(!abuf)
853                 goto err;
854         if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
855                 goto err;
856         OPENSSL_free(abuf);
857         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
858                 goto err;
859         abuf = OPENSSL_malloc(siglen);
860         if(!abuf)
861                 goto err;
862         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
863                 goto err;
864
865         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
866                                 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
867                 {
868                 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
869                 goto err;
870                 }
871
872         EVP_MD_CTX_cleanup(&mctx);
873
874         ASN1_STRING_set0(si->enc_digest, abuf, siglen);
875
876         return 1;
877
878         err:
879         if (abuf)
880                 OPENSSL_free(abuf);
881         EVP_MD_CTX_cleanup(&mctx);
882         return 0;
883
884         }
885
886 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
887              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
888         {
889         PKCS7_ISSUER_AND_SERIAL *ias;
890         int ret=0,i;
891         STACK_OF(X509) *cert;
892         X509 *x509;
893
894         if (PKCS7_type_is_signed(p7))
895                 {
896                 cert=p7->d.sign->cert;
897                 }
898         else if (PKCS7_type_is_signedAndEnveloped(p7))
899                 {
900                 cert=p7->d.signed_and_enveloped->cert;
901                 }
902         else
903                 {
904                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
905                 goto err;
906                 }
907         /* XXXXXXXXXXXXXXXXXXXXXXX */
908         ias=si->issuer_and_serial;
909
910         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
911
912         /* were we able to find the cert in passed to us */
913         if (x509 == NULL)
914                 {
915                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
916                 goto err;
917                 }
918
919         /* Lets verify */
920         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
921                 {
922                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
923                 goto err;
924                 }
925         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
926         i=X509_verify_cert(ctx);
927         if (i <= 0) 
928                 {
929                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
930                 X509_STORE_CTX_cleanup(ctx);
931                 goto err;
932                 }
933         X509_STORE_CTX_cleanup(ctx);
934
935         return PKCS7_signatureVerify(bio, p7, si, x509);
936         err:
937         return ret;
938         }
939
940 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
941                                                                 X509 *x509)
942         {
943         ASN1_OCTET_STRING *os;
944         EVP_MD_CTX mdc_tmp,*mdc;
945         int ret=0,i;
946         int md_type;
947         STACK_OF(X509_ATTRIBUTE) *sk;
948         BIO *btmp;
949         EVP_PKEY *pkey;
950
951         EVP_MD_CTX_init(&mdc_tmp);
952
953         if (!PKCS7_type_is_signed(p7) && 
954                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
955                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
956                                                 PKCS7_R_WRONG_PKCS7_TYPE);
957                 goto err;
958         }
959
960         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
961
962         btmp=bio;
963         for (;;)
964                 {
965                 if ((btmp == NULL) ||
966                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
967                         {
968                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
969                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
970                         goto err;
971                         }
972                 BIO_get_md_ctx(btmp,&mdc);
973                 if (mdc == NULL)
974                         {
975                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
976                                                         ERR_R_INTERNAL_ERROR);
977                         goto err;
978                         }
979                 if (EVP_MD_CTX_type(mdc) == md_type)
980                         break;
981                 /* Workaround for some broken clients that put the signature
982                  * OID instead of the digest OID in digest_alg->algorithm
983                  */
984                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
985                         break;
986                 btmp=BIO_next(btmp);
987                 }
988
989         /* mdc is the digest ctx that we want, unless there are attributes,
990          * in which case the digest is the signed attributes */
991         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
992
993         sk=si->auth_attr;
994         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
995                 {
996                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
997                 unsigned int md_len, alen;
998                 ASN1_OCTET_STRING *message_digest;
999
1000                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
1001                 message_digest=PKCS7_digest_from_attributes(sk);
1002                 if (!message_digest)
1003                         {
1004                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1005                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1006                         goto err;
1007                         }
1008                 if ((message_digest->length != (int)md_len) ||
1009                         (memcmp(message_digest->data,md_dat,md_len)))
1010                         {
1011 #if 0
1012 {
1013 int ii;
1014 for (ii=0; ii<message_digest->length; ii++)
1015         printf("%02X",message_digest->data[ii]); printf(" sent\n");
1016 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1017 }
1018 #endif
1019                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1020                                                         PKCS7_R_DIGEST_FAILURE);
1021                         ret= -1;
1022                         goto err;
1023                         }
1024
1025                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
1026
1027                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1028                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1029                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
1030
1031                 OPENSSL_free(abuf);
1032                 }
1033
1034         os=si->enc_digest;
1035         pkey = X509_get_pubkey(x509);
1036         if (!pkey)
1037                 {
1038                 ret = -1;
1039                 goto err;
1040                 }
1041
1042         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1043         EVP_PKEY_free(pkey);
1044         if (i <= 0)
1045                 {
1046                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1047                                                 PKCS7_R_SIGNATURE_FAILURE);
1048                 ret= -1;
1049                 goto err;
1050                 }
1051         else
1052                 ret=1;
1053 err:
1054         EVP_MD_CTX_cleanup(&mdc_tmp);
1055         return(ret);
1056         }
1057
1058 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1059         {
1060         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1061         PKCS7_RECIP_INFO *ri;
1062         int i;
1063
1064         i=OBJ_obj2nid(p7->type);
1065         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
1066         rsk=p7->d.signed_and_enveloped->recipientinfo;
1067         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1068         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1069         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1070         return(ri->issuer_and_serial);
1071         }
1072
1073 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1074         {
1075         return(get_attribute(si->auth_attr,nid));
1076         }
1077
1078 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1079         {
1080         return(get_attribute(si->unauth_attr,nid));
1081         }
1082
1083 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1084         {
1085         int i;
1086         X509_ATTRIBUTE *xa;
1087         ASN1_OBJECT *o;
1088
1089         o=OBJ_nid2obj(nid);
1090         if (!o || !sk) return(NULL);
1091         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1092                 {
1093                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1094                 if (OBJ_cmp(xa->object,o) == 0)
1095                         {
1096                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1097                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1098                         else
1099                                 return(NULL);
1100                         }
1101                 }
1102         return(NULL);
1103         }
1104
1105 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1106 {
1107         ASN1_TYPE *astype;
1108         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1109         return astype->value.octet_string;
1110 }
1111
1112 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1113                                 STACK_OF(X509_ATTRIBUTE) *sk)
1114         {
1115         int i;
1116
1117         if (p7si->auth_attr != NULL)
1118                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1119         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1120         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1121                 {
1122                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1123                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1124                     == NULL)
1125                         return(0);
1126                 }
1127         return(1);
1128         }
1129
1130 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1131         {
1132         int i;
1133
1134         if (p7si->unauth_attr != NULL)
1135                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1136                                            X509_ATTRIBUTE_free);
1137         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1138         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1139                 {
1140                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1141                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1142                     == NULL)
1143                         return(0);
1144                 }
1145         return(1);
1146         }
1147
1148 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1149              void *value)
1150         {
1151         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1152         }
1153
1154 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1155              void *value)
1156         {
1157         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1158         }
1159
1160 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1161                          void *value)
1162         {
1163         X509_ATTRIBUTE *attr=NULL;
1164
1165         if (*sk == NULL)
1166                 {
1167                 *sk = sk_X509_ATTRIBUTE_new_null();
1168 new_attrib:
1169                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1170                 sk_X509_ATTRIBUTE_push(*sk,attr);
1171                 }
1172         else
1173                 {
1174                 int i;
1175
1176                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1177                         {
1178                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1179                         if (OBJ_obj2nid(attr->object) == nid)
1180                                 {
1181                                 X509_ATTRIBUTE_free(attr);
1182                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1183                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1184                                 goto end;
1185                                 }
1186                         }
1187                 goto new_attrib;
1188                 }
1189 end:
1190         return(1);
1191         }
1192