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 "internal/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     case NID_pkcs7_data:
  79     case NID_pkcs7_signed:
  80     case NID_pkcs7_enveloped:
  81     case NID_pkcs7_signedAndEnveloped:
  82     case NID_pkcs7_digest:
  83     case NID_pkcs7_encrypted:
  84         isOther = 0;
  85         break;
  86     default:
  87         isOther = 1;
  88     }
  89
  90     return isOther;
  91
  92 }
  93
  94 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  95 {
  96     if (PKCS7_type_is_data(p7))
  97         return p7->d.data;
  98     if (PKCS7_type_is_other(p7) && p7->d.other
  99         && (p7->d.other->type == V_ASN1_OCTET_STRING))
 100         return p7->d.other->value.octet_string;
 101     return NULL;
 102 }
 103
 104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 105 {
 106     BIO *btmp;
 107     const EVP_MD *md;
 108     if ((btmp = BIO_new(BIO_f_md())) == NULL) {
 109         PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
 110         goto err;
 111     }
 112
 113     md = EVP_get_digestbyobj(alg->algorithm);
 114     if (md == NULL) {
 115         PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
 116         goto err;
 117     }
 118
 119     BIO_set_md(btmp, md);
 120     if (*pbio == NULL)
 121         *pbio = btmp;
 122     else if (!BIO_push(*pbio, btmp)) {
 123         PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
 124         goto err;
 125     }
 126     btmp = NULL;
 127
 128     return 1;
 129
 130  err:
 131     BIO_free(btmp);
 132     return 0;
 133
 134 }
 135
 136 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
 137                               unsigned char *key, int keylen)
 138 {
 139     EVP_PKEY_CTX *pctx = NULL;
 140     EVP_PKEY *pkey = NULL;
 141     unsigned char *ek = NULL;
 142     int ret = 0;
 143     size_t eklen;
 144
 145     pkey = X509_get0_pubkey(ri->cert);
 146
 147     if (!pkey)
 148         return 0;
 149
 150     pctx = EVP_PKEY_CTX_new(pkey, NULL);
 151     if (!pctx)
 152         return 0;
 153
 154     if (EVP_PKEY_encrypt_init(pctx) <= 0)
 155         goto err;
 156
 157     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 158                           EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
 159         PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
 160         goto err;
 161     }
 162
 163     if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
 164         goto err;
 165
 166     ek = OPENSSL_malloc(eklen);
 167
 168     if (ek == NULL) {
 169         PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
 170         goto err;
 171     }
 172
 173     if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
 174         goto err;
 175
 176     ASN1_STRING_set0(ri->enc_key, ek, eklen);
 177     ek = NULL;
 178
 179     ret = 1;
 180
 181  err:
 182     EVP_PKEY_CTX_free(pctx);
 183     OPENSSL_free(ek);
 184     return ret;
 185
 186 }
 187
 188 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
 189                                PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
 190 {
 191     EVP_PKEY_CTX *pctx = NULL;
 192     unsigned char *ek = NULL;
 193     size_t eklen;
 194
 195     int ret = -1;
 196
 197     pctx = EVP_PKEY_CTX_new(pkey, NULL);
 198     if (!pctx)
 199         return -1;
 200
 201     if (EVP_PKEY_decrypt_init(pctx) <= 0)
 202         goto err;
 203
 204     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
 205                           EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
 206         PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
 207         goto err;
 208     }
 209
 210     if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
 211                          ri->enc_key->data, ri->enc_key->length) <= 0)
 212         goto err;
 213
 214     ek = OPENSSL_malloc(eklen);
 215
 216     if (ek == NULL) {
 217         PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
 218         goto err;
 219     }
 220
 221     if (EVP_PKEY_decrypt(pctx, ek, &eklen,
 222                          ri->enc_key->data, ri->enc_key->length) <= 0) {
 223         ret = 0;
 224         PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
 225         goto err;
 226     }
 227
 228     ret = 1;
 229
 230     OPENSSL_clear_free(*pek, *peklen);
 231     *pek = ek;
 232     *peklen = eklen;
 233
 234  err:
 235     EVP_PKEY_CTX_free(pctx);
 236     if (!ret)
 237         OPENSSL_free(ek);
 238
 239     return ret;
 240 }
 241
 242 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 243 {
 244     int i;
 245     BIO *out = NULL, *btmp = NULL;
 246     X509_ALGOR *xa = NULL;
 247     const EVP_CIPHER *evp_cipher = NULL;
 248     STACK_OF(X509_ALGOR) *md_sk = NULL;
 249     STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
 250     X509_ALGOR *xalg = NULL;
 251     PKCS7_RECIP_INFO *ri = NULL;
 252     ASN1_OCTET_STRING *os = NULL;
 253
 254     if (p7 == NULL) {
 255         PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
 256         return NULL;
 257     }
 258     /*
 259      * The content field in the PKCS7 ContentInfo is optional, but that really
 260      * only applies to inner content (precisely, detached signatures).
 261      *
 262      * When reading content, missing outer content is therefore treated as an
 263      * error.
 264      *
 265      * When creating content, PKCS7_content_new() must be called before
 266      * calling this method, so a NULL p7->d is always an error.
 267      */
 268     if (p7->d.ptr == NULL) {
 269         PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
 270         return NULL;
 271     }
 272
 273     i = OBJ_obj2nid(p7->type);
 274     p7->state = PKCS7_S_HEADER;
 275
 276     switch (i) {
 277     case NID_pkcs7_signed:
 278         md_sk = p7->d.sign->md_algs;
 279         os = PKCS7_get_octet_string(p7->d.sign->contents);
 280         break;
 281     case NID_pkcs7_signedAndEnveloped:
 282         rsk = p7->d.signed_and_enveloped->recipientinfo;
 283         md_sk = p7->d.signed_and_enveloped->md_algs;
 284         xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
 285         evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
 286         if (evp_cipher == NULL) {
 287             PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
 288             goto err;
 289         }
 290         break;
 291     case NID_pkcs7_enveloped:
 292         rsk = p7->d.enveloped->recipientinfo;
 293         xalg = p7->d.enveloped->enc_data->algorithm;
 294         evp_cipher = p7->d.enveloped->enc_data->cipher;
 295         if (evp_cipher == NULL) {
 296             PKCS7err(PKCS7_F_PKCS7_DATAINIT, 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     case NID_pkcs7_data:
 305         break;
 306     default:
 307         PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 308         goto err;
 309     }
 310
 311     for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
 312         if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 313             goto err;
 314
 315     if (xa && !PKCS7_bio_add_digest(&out, xa))
 316         goto err;
 317
 318     if (evp_cipher != NULL) {
 319         unsigned char key[EVP_MAX_KEY_LENGTH];
 320         unsigned char iv[EVP_MAX_IV_LENGTH];
 321         int keylen, ivlen;
 322         EVP_CIPHER_CTX *ctx;
 323
 324         if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
 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)
 333             if (RAND_bytes(iv, ivlen) <= 0)
 334                 goto err;
 335         if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
 336             goto err;
 337         if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 338             goto err;
 339         if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 340             goto err;
 341
 342         if (ivlen > 0) {
 343             if (xalg->parameter == NULL) {
 344                 xalg->parameter = ASN1_TYPE_new();
 345                 if (xalg->parameter == NULL)
 346                     goto err;
 347             }
 348             if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 349                 goto err;
 350         }
 351
 352         /* Lets do the pub key stuff :-) */
 353         for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 354             ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
 355             if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
 356                 goto err;
 357         }
 358         OPENSSL_cleanse(key, keylen);
 359
 360         if (out == NULL)
 361             out = btmp;
 362         else
 363             BIO_push(out, btmp);
 364         btmp = NULL;
 365     }
 366
 367     if (bio == NULL) {
 368         if (PKCS7_is_detached(p7))
 369             bio = BIO_new(BIO_s_null());
 370         else if (os && os->length > 0)
 371             bio = BIO_new_mem_buf(os->data, os->length);
 372         if (bio == NULL) {
 373             bio = BIO_new(BIO_s_mem());
 374             if (bio == NULL)
 375                 goto err;
 376             BIO_set_mem_eof_return(bio, 0);
 377         }
 378     }
 379     if (out)
 380         BIO_push(out, bio);
 381     else
 382         out = bio;
 383     return out;
 384
 385  err:
 386     BIO_free_all(out);
 387     BIO_free_all(btmp);
 388     return NULL;
 389 }
 390
 391 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 392 {
 393     int ret;
 394     ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 395                         X509_get_issuer_name(pcert));
 396     if (ret)
 397         return ret;
 398     return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
 399                             ri->issuer_and_serial->serial);
 400 }
 401
 402 /* int */
 403 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 404 {
 405     int i, j;
 406     BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
 407     X509_ALGOR *xa;
 408     ASN1_OCTET_STRING *data_body = NULL;
 409     const EVP_MD *evp_md;
 410     const EVP_CIPHER *evp_cipher = NULL;
 411     EVP_CIPHER_CTX *evp_ctx = NULL;
 412     X509_ALGOR *enc_alg = NULL;
 413     STACK_OF(X509_ALGOR) *md_sk = NULL;
 414     STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
 415     PKCS7_RECIP_INFO *ri = NULL;
 416     unsigned char *ek = NULL, *tkey = NULL;
 417     int eklen = 0, tkeylen = 0;
 418
 419     if (p7 == NULL) {
 420         PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
 421         return NULL;
 422     }
 423
 424     if (p7->d.ptr == NULL) {
 425         PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
 426         return NULL;
 427     }
 428
 429     i = OBJ_obj2nid(p7->type);
 430     p7->state = PKCS7_S_HEADER;
 431
 432     switch (i) {
 433     case NID_pkcs7_signed:
 434         /*
 435          * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
 436          * field and optional content.
 437          * data_body is NULL if that structure has no (=detached) content
 438          * or if the contentType is wrong (i.e., not "data").
 439          */
 440         data_body = PKCS7_get_octet_string(p7->d.sign->contents);
 441         if (!PKCS7_is_detached(p7) && data_body == NULL) {
 442             PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 443                      PKCS7_R_INVALID_SIGNED_DATA_TYPE);
 444             goto err;
 445         }
 446         md_sk = p7->d.sign->md_algs;
 447         break;
 448     case NID_pkcs7_signedAndEnveloped:
 449         rsk = p7->d.signed_and_enveloped->recipientinfo;
 450         md_sk = p7->d.signed_and_enveloped->md_algs;
 451         /* data_body is NULL if the optional EncryptedContent is missing. */
 452         data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
 453         enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
 454         evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
 455         if (evp_cipher == NULL) {
 456             PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 457                      PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 458             goto err;
 459         }
 460         break;
 461     case NID_pkcs7_enveloped:
 462         rsk = p7->d.enveloped->recipientinfo;
 463         enc_alg = p7->d.enveloped->enc_data->algorithm;
 464         /* data_body is NULL if the optional EncryptedContent is missing. */
 465         data_body = p7->d.enveloped->enc_data->enc_data;
 466         evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
 467         if (evp_cipher == NULL) {
 468             PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 469                      PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 470             goto err;
 471         }
 472         break;
 473     default:
 474         PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 475         goto err;
 476     }
 477
 478     /* Detached content must be supplied via in_bio instead. */
 479     if (data_body == NULL && in_bio == NULL) {
 480         PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
 481         goto err;
 482     }
 483
 484     /* We will be checking the signature */
 485     if (md_sk != NULL) {
 486         for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
 487             xa = sk_X509_ALGOR_value(md_sk, i);
 488             if ((btmp = BIO_new(BIO_f_md())) == NULL) {
 489                 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
 490                 goto err;
 491             }
 492
 493             j = OBJ_obj2nid(xa->algorithm);
 494             evp_md = EVP_get_digestbynid(j);
 495             if (evp_md == NULL) {
 496                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 497                          PKCS7_R_UNKNOWN_DIGEST_TYPE);
 498                 goto err;
 499             }
 500
 501             BIO_set_md(btmp, evp_md);
 502             if (out == NULL)
 503                 out = btmp;
 504             else
 505                 BIO_push(out, btmp);
 506             btmp = NULL;
 507         }
 508     }
 509
 510     if (evp_cipher != NULL) {
 511         if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
 512             PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
 513             goto err;
 514         }
 515
 516         /*
 517          * It was encrypted, we need to decrypt the secret key with the
 518          * private key
 519          */
 520
 521         /*
 522          * Find the recipientInfo which matches the passed certificate (if
 523          * any)
 524          */
 525
 526         if (pcert) {
 527             for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 528                 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
 529                 if (!pkcs7_cmp_ri(ri, pcert))
 530                     break;
 531                 ri = NULL;
 532             }
 533             if (ri == NULL) {
 534                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 535                          PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 536                 goto err;
 537             }
 538         }
 539
 540         /* If we haven't got a certificate try each ri in turn */
 541         if (pcert == NULL) {
 542             /*
 543              * Always attempt to decrypt all rinfo even after success as a
 544              * defence against MMA timing attacks.
 545              */
 546             for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 547                 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
 548
 549                 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
 550                     goto err;
 551                 ERR_clear_error();
 552             }
 553         } else {
 554             /* Only exit on fatal errors, not decrypt failure */
 555             if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
 556                 goto err;
 557             ERR_clear_error();
 558         }
 559
 560         evp_ctx = NULL;
 561         BIO_get_cipher_ctx(etmp, &evp_ctx);
 562         if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
 563             goto err;
 564         if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
 565             goto err;
 566         /* Generate random key as MMA defence */
 567         tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
 568         tkey = OPENSSL_malloc(tkeylen);
 569         if (tkey == NULL)
 570             goto err;
 571         if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
 572             goto err;
 573         if (ek == NULL) {
 574             ek = tkey;
 575             eklen = tkeylen;
 576             tkey = NULL;
 577         }
 578
 579         if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 580             /*
 581              * Some S/MIME clients don't use the same key and effective key
 582              * length. The key length is determined by the size of the
 583              * decrypted RSA key.
 584              */
 585             if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
 586                 /* Use random key as MMA defence */
 587                 OPENSSL_clear_free(ek, eklen);
 588                 ek = tkey;
 589                 eklen = tkeylen;
 590                 tkey = NULL;
 591             }
 592         }
 593         /* Clear errors so we don't leak information useful in MMA */
 594         ERR_clear_error();
 595         if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
 596             goto err;
 597
 598         OPENSSL_clear_free(ek, eklen);
 599         ek = NULL;
 600         OPENSSL_clear_free(tkey, tkeylen);
 601         tkey = NULL;
 602
 603         if (out == NULL)
 604             out = etmp;
 605         else
 606             BIO_push(out, etmp);
 607         etmp = NULL;
 608     }
 609     if (in_bio != NULL) {
 610         bio = in_bio;
 611     } else {
 612         if (data_body->length > 0)
 613             bio = BIO_new_mem_buf(data_body->data, data_body->length);
 614         else {
 615             bio = BIO_new(BIO_s_mem());
 616             if (bio == NULL)
 617                 goto err;
 618             BIO_set_mem_eof_return(bio, 0);
 619         }
 620         if (bio == NULL)
 621             goto err;
 622     }
 623     BIO_push(out, bio);
 624     bio = NULL;
 625     return out;
 626
 627  err:
 628     OPENSSL_clear_free(ek, eklen);
 629     OPENSSL_clear_free(tkey, tkeylen);
 630     BIO_free_all(out);
 631     BIO_free_all(btmp);
 632     BIO_free_all(etmp);
 633     BIO_free_all(bio);
 634     return  NULL;
 635 }
 636
 637 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 638 {
 639     for (;;) {
 640         bio = BIO_find_type(bio, BIO_TYPE_MD);
 641         if (bio == NULL) {
 642             PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
 643                      PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 644             return NULL;
 645         }
 646         BIO_get_md_ctx(bio, pmd);
 647         if (*pmd == NULL) {
 648             PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
 649             return NULL;
 650         }
 651         if (EVP_MD_CTX_type(*pmd) == nid)
 652             return bio;
 653         bio = BIO_next(bio);
 654     }
 655     return NULL;
 656 }
 657
 658 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
 659 {
 660     unsigned char md_data[EVP_MAX_MD_SIZE];
 661     unsigned int md_len;
 662
 663     /* Add signing time if not already present */
 664     if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
 665         if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
 666             PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 667             return 0;
 668         }
 669     }
 670
 671     /* Add digest */
 672     if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
 673         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
 674         return 0;
 675     }
 676     if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
 677         PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
 678         return 0;
 679     }
 680
 681     /* Now sign the attributes */
 682     if (!PKCS7_SIGNER_INFO_sign(si))
 683         return 0;
 684
 685     return 1;
 686 }
 687
 688 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 689 {
 690     int ret = 0;
 691     int i, j;
 692     BIO *btmp;
 693     PKCS7_SIGNER_INFO *si;
 694     EVP_MD_CTX *mdc, *ctx_tmp;
 695     STACK_OF(X509_ATTRIBUTE) *sk;
 696     STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
 697     ASN1_OCTET_STRING *os = NULL;
 698
 699     if (p7 == NULL) {
 700         PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
 701         return 0;
 702     }
 703
 704     if (p7->d.ptr == NULL) {
 705         PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
 706         return 0;
 707     }
 708
 709     ctx_tmp = EVP_MD_CTX_new();
 710     if (ctx_tmp == NULL) {
 711         PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
 712         return 0;
 713     }
 714
 715     i = OBJ_obj2nid(p7->type);
 716     p7->state = PKCS7_S_HEADER;
 717
 718     switch (i) {
 719     case NID_pkcs7_data:
 720         os = p7->d.data;
 721         break;
 722     case NID_pkcs7_signedAndEnveloped:
 723         /* XXXXXXXXXXXXXXXX */
 724         si_sk = p7->d.signed_and_enveloped->signer_info;
 725         os = p7->d.signed_and_enveloped->enc_data->enc_data;
 726         if (os == NULL) {
 727             os = ASN1_OCTET_STRING_new();
 728             if (os == NULL) {
 729                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
 730                 goto err;
 731             }
 732             p7->d.signed_and_enveloped->enc_data->enc_data = os;
 733         }
 734         break;
 735     case NID_pkcs7_enveloped:
 736         /* XXXXXXXXXXXXXXXX */
 737         os = p7->d.enveloped->enc_data->enc_data;
 738         if (os == NULL) {
 739             os = ASN1_OCTET_STRING_new();
 740             if (os == NULL) {
 741                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
 742                 goto err;
 743             }
 744             p7->d.enveloped->enc_data->enc_data = os;
 745         }
 746         break;
 747     case NID_pkcs7_signed:
 748         si_sk = p7->d.sign->signer_info;
 749         os = PKCS7_get_octet_string(p7->d.sign->contents);
 750         /* If detached data then the content is excluded */
 751         if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 752             ASN1_OCTET_STRING_free(os);
 753             os = NULL;
 754             p7->d.sign->contents->d.data = NULL;
 755         }
 756         break;
 757
 758     case NID_pkcs7_digest:
 759         os = PKCS7_get_octet_string(p7->d.digest->contents);
 760         /* If detached data then the content is excluded */
 761         if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
 762             ASN1_OCTET_STRING_free(os);
 763             os = NULL;
 764             p7->d.digest->contents->d.data = NULL;
 765         }
 766         break;
 767
 768     default:
 769         PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 770         goto err;
 771     }
 772
 773     if (si_sk != NULL) {
 774         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
 775             si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
 776             if (si->pkey == NULL)
 777                 continue;
 778
 779             j = OBJ_obj2nid(si->digest_alg->algorithm);
 780
 781             btmp = bio;
 782
 783             btmp = PKCS7_find_digest(&mdc, btmp, j);
 784
 785             if (btmp == NULL)
 786                 goto err;
 787
 788             /*
 789              * We now have the EVP_MD_CTX, lets do the signing.
 790              */
 791             if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
 792                 goto err;
 793
 794             sk = si->auth_attr;
 795
 796             /*
 797              * If there are attributes, we add the digest attribute and only
 798              * sign the attributes
 799              */
 800             if (sk_X509_ATTRIBUTE_num(sk) > 0) {
 801                 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
 802                     goto err;
 803             } else {
 804                 unsigned char *abuf = NULL;
 805                 unsigned int abuflen;
 806                 abuflen = EVP_PKEY_size(si->pkey);
 807                 abuf = OPENSSL_malloc(abuflen);
 808                 if (abuf == NULL)
 809                     goto err;
 810
 811                 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
 812                     PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
 813                     goto err;
 814                 }
 815                 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
 816             }
 817         }
 818     } else if (i == NID_pkcs7_digest) {
 819         unsigned char md_data[EVP_MAX_MD_SIZE];
 820         unsigned int md_len;
 821         if (!PKCS7_find_digest(&mdc, bio,
 822                                OBJ_obj2nid(p7->d.digest->md->algorithm)))
 823             goto err;
 824         if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
 825             goto err;
 826         ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 827     }
 828
 829     if (!PKCS7_is_detached(p7)) {
 830         /*
 831          * NOTE(emilia): I think we only reach os == NULL here because detached
 832          * digested data support is broken.
 833          */
 834         if (os == NULL)
 835             goto err;
 836         if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
 837             char *cont;
 838             long contlen;
 839             btmp = BIO_find_type(bio, BIO_TYPE_MEM);
 840             if (btmp == NULL) {
 841                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 842                 goto err;
 843             }
 844             contlen = BIO_get_mem_data(btmp, &cont);
 845             /*
 846              * Mark the BIO read only then we can use its copy of the data
 847              * instead of making an extra copy.
 848              */
 849             BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 850             BIO_set_mem_eof_return(btmp, 0);
 851             ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 852         }
 853     }
 854     ret = 1;
 855  err:
 856     EVP_MD_CTX_free(ctx_tmp);
 857     return (ret);
 858 }
 859
 860 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
 861 {
 862     EVP_MD_CTX *mctx;
 863     EVP_PKEY_CTX *pctx;
 864     unsigned char *abuf = NULL;
 865     int alen;
 866     size_t siglen;
 867     const EVP_MD *md = NULL;
 868
 869     md = EVP_get_digestbyobj(si->digest_alg->algorithm);
 870     if (md == NULL)
 871         return 0;
 872
 873     mctx = EVP_MD_CTX_new();
 874     if (mctx == NULL) {
 875         PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
 876         goto err;
 877     }
 878
 879     if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 880         goto err;
 881
 882     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 883                           EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
 884         PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 885         goto err;
 886     }
 887
 888     alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
 889                          ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 890     if (!abuf)
 891         goto err;
 892     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 893         goto err;
 894     OPENSSL_free(abuf);
 895     abuf = NULL;
 896     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 897         goto err;
 898     abuf = OPENSSL_malloc(siglen);
 899     if (abuf == NULL)
 900         goto err;
 901     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 902         goto err;
 903
 904     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 905                           EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
 906         PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
 907         goto err;
 908     }
 909
 910     EVP_MD_CTX_free(mctx);
 911
 912     ASN1_STRING_set0(si->enc_digest, abuf, siglen);
 913
 914     return 1;
 915
 916  err:
 917     OPENSSL_free(abuf);
 918     EVP_MD_CTX_free(mctx);
 919     return 0;
 920
 921 }
 922
 923 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 924                      PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 925 {
 926     PKCS7_ISSUER_AND_SERIAL *ias;
 927     int ret = 0, i;
 928     STACK_OF(X509) *cert;
 929     X509 *x509;
 930
 931     if (p7 == NULL) {
 932         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
 933         return 0;
 934     }
 935
 936     if (p7->d.ptr == NULL) {
 937         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
 938         return 0;
 939     }
 940
 941     if (PKCS7_type_is_signed(p7)) {
 942         cert = p7->d.sign->cert;
 943     } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
 944         cert = p7->d.signed_and_enveloped->cert;
 945     } else {
 946         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
 947         goto err;
 948     }
 949     /* XXXXXXXXXXXXXXXXXXXXXXX */
 950     ias = si->issuer_and_serial;
 951
 952     x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
 953
 954     /* were we able to find the cert in passed to us */
 955     if (x509 == NULL) {
 956         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
 957                  PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 958         goto err;
 959     }
 960
 961     /* Lets verify */
 962     if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
 963         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
 964         goto err;
 965     }
 966     X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 967     i = X509_verify_cert(ctx);
 968     if (i <= 0) {
 969         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
 970         X509_STORE_CTX_cleanup(ctx);
 971         goto err;
 972     }
 973     X509_STORE_CTX_cleanup(ctx);
 974
 975     return PKCS7_signatureVerify(bio, p7, si, x509);
 976  err:
 977     return ret;
 978 }
 979
 980 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 981                           X509 *x509)
 982 {
 983     ASN1_OCTET_STRING *os;
 984     EVP_MD_CTX *mdc_tmp, *mdc;
 985     int ret = 0, i;
 986     int md_type;
 987     STACK_OF(X509_ATTRIBUTE) *sk;
 988     BIO *btmp;
 989     EVP_PKEY *pkey;
 990
 991     mdc_tmp = EVP_MD_CTX_new();
 992     if (mdc_tmp == NULL) {
 993         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
 994         goto err;
 995     }
 996
 997     if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
 998         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
 999         goto err;
1000     }
1001
1002     md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1003
1004     btmp = bio;
1005     for (;;) {
1006         if ((btmp == NULL) ||
1007             ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1008             PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1009                      PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1010             goto err;
1011         }
1012         BIO_get_md_ctx(btmp, &mdc);
1013         if (mdc == NULL) {
1014             PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1015             goto err;
1016         }
1017         if (EVP_MD_CTX_type(mdc) == md_type)
1018             break;
1019         /*
1020          * Workaround for some broken clients that put the signature OID
1021          * instead of the digest OID in digest_alg->algorithm
1022          */
1023         if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1024             break;
1025         btmp = BIO_next(btmp);
1026     }
1027
1028     /*
1029      * mdc is the digest ctx that we want, unless there are attributes, in
1030      * which case the digest is the signed attributes
1031      */
1032     if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1033         goto err;
1034
1035     sk = si->auth_attr;
1036     if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1037         unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1038         unsigned int md_len;
1039         int alen;
1040         ASN1_OCTET_STRING *message_digest;
1041
1042         if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1043             goto err;
1044         message_digest = PKCS7_digest_from_attributes(sk);
1045         if (!message_digest) {
1046             PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1047                      PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1048             goto err;
1049         }
1050         if ((message_digest->length != (int)md_len) ||
1051             (memcmp(message_digest->data, md_dat, md_len))) {
1052             PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1053             ret = -1;
1054             goto err;
1055         }
1056
1057         if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1058             goto err;
1059
1060         alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1061                              ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1062         if (alen <= 0) {
1063             PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1064             ret = -1;
1065             goto err;
1066         }
1067         if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1068             goto err;
1069
1070         OPENSSL_free(abuf);
1071     }
1072
1073     os = si->enc_digest;
1074     pkey = X509_get0_pubkey(x509);
1075     if (!pkey) {
1076         ret = -1;
1077         goto err;
1078     }
1079
1080     i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1081     if (i <= 0) {
1082         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1083         ret = -1;
1084         goto err;
1085     }
1086     ret = 1;
1087  err:
1088     EVP_MD_CTX_free(mdc_tmp);
1089     return (ret);
1090 }
1091
1092 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1093 {
1094     STACK_OF(PKCS7_RECIP_INFO) *rsk;
1095     PKCS7_RECIP_INFO *ri;
1096     int i;
1097
1098     i = OBJ_obj2nid(p7->type);
1099     if (i != NID_pkcs7_signedAndEnveloped)
1100         return NULL;
1101     if (p7->d.signed_and_enveloped == NULL)
1102         return NULL;
1103     rsk = p7->d.signed_and_enveloped->recipientinfo;
1104     if (rsk == NULL)
1105         return NULL;
1106     if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1107         return (NULL);
1108     ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1109     return (ri->issuer_and_serial);
1110 }
1111
1112 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1113 {
1114     return (get_attribute(si->auth_attr, nid));
1115 }
1116
1117 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1118 {
1119     return (get_attribute(si->unauth_attr, nid));
1120 }
1121
1122 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1123 {
1124     int idx;
1125     X509_ATTRIBUTE *xa;
1126     idx = X509at_get_attr_by_NID(sk, nid, -1);
1127     xa = X509at_get_attr(sk, idx);
1128     return X509_ATTRIBUTE_get0_type(xa, 0);
1129 }
1130
1131 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1132 {
1133     ASN1_TYPE *astype;
1134     if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1135         return NULL;
1136     return astype->value.octet_string;
1137 }
1138
1139 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1140                                 STACK_OF(X509_ATTRIBUTE) *sk)
1141 {
1142     int i;
1143
1144     sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1145     p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1146     if (p7si->auth_attr == NULL)
1147         return 0;
1148     for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1149         if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1150                                    X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1151                                                       (sk, i))))
1152             == NULL)
1153             return (0);
1154     }
1155     return (1);
1156 }
1157
1158 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1159                          STACK_OF(X509_ATTRIBUTE) *sk)
1160 {
1161     int i;
1162
1163     sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1164     p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1165     if (p7si->unauth_attr == NULL)
1166         return 0;
1167     for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1168         if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1169                                    X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1170                                                       (sk, i))))
1171             == NULL)
1172             return (0);
1173     }
1174     return (1);
1175 }
1176
1177 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1178                                void *value)
1179 {
1180     return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1181 }
1182
1183 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1184                         void *value)
1185 {
1186     return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1187 }
1188
1189 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1190                          void *value)
1191 {
1192     X509_ATTRIBUTE *attr = NULL;
1193
1194     if (*sk == NULL) {
1195         if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1196             return 0;
1197  new_attrib:
1198         if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1199             return 0;
1200         if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1201             X509_ATTRIBUTE_free(attr);
1202             return 0;
1203         }
1204     } else {
1205         int i;
1206
1207         for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1208             attr = sk_X509_ATTRIBUTE_value(*sk, i);
1209             if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1210                 X509_ATTRIBUTE_free(attr);
1211                 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1212                 if (attr == NULL)
1213                     return 0;
1214                 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1215                     X509_ATTRIBUTE_free(attr);
1216                     return 0;
1217                 }
1218                 goto end;
1219             }
1220         }
1221         goto new_attrib;
1222     }
1223  end:
1224     return (1);
1225 }