crypto/cms/cms_env.c

   1 /* crypto/cms/cms_env.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  */
  54
  55 #include "internal/cryptlib.h"
  56 #include <openssl/asn1t.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/x509v3.h>
  59 #include <openssl/err.h>
  60 #include <openssl/cms.h>
  61 #include <openssl/rand.h>
  62 #include <openssl/aes.h>
  63 #include "cms_lcl.h"
  64 #include "internal/asn1_int.h"
  65 #include "internal/evp_int.h"
  66
  67 /* CMS EnvelopedData Utilities */
  68
  69 CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
  70 {
  71     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
  72         CMSerr(CMS_F_CMS_GET0_ENVELOPED,
  73                CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
  74         return NULL;
  75     }
  76     return cms->d.envelopedData;
  77 }
  78
  79 static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
  80 {
  81     if (cms->d.other == NULL) {
  82         cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
  83         if (!cms->d.envelopedData) {
  84             CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  85             return NULL;
  86         }
  87         cms->d.envelopedData->version = 0;
  88         cms->d.envelopedData->encryptedContentInfo->contentType =
  89             OBJ_nid2obj(NID_pkcs7_data);
  90         ASN1_OBJECT_free(cms->contentType);
  91         cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
  92         return cms->d.envelopedData;
  93     }
  94     return cms_get0_enveloped(cms);
  95 }
  96
  97 int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
  98 {
  99     EVP_PKEY *pkey;
 100     int i;
 101     if (ri->type == CMS_RECIPINFO_TRANS)
 102         pkey = ri->d.ktri->pkey;
 103     else if (ri->type == CMS_RECIPINFO_AGREE) {
 104         EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
 105         if (!pctx)
 106             return 0;
 107         pkey = EVP_PKEY_CTX_get0_pkey(pctx);
 108         if (!pkey)
 109             return 0;
 110     } else
 111         return 0;
 112     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 113         return 1;
 114     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
 115     if (i == -2) {
 116         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
 117                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 118         return 0;
 119     }
 120     if (i <= 0) {
 121         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 122         return 0;
 123     }
 124     return 1;
 125 }
 126
 127 STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
 128 {
 129     CMS_EnvelopedData *env;
 130     env = cms_get0_enveloped(cms);
 131     if (!env)
 132         return NULL;
 133     return env->recipientInfos;
 134 }
 135
 136 int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
 137 {
 138     return ri->type;
 139 }
 140
 141 EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
 142 {
 143     if (ri->type == CMS_RECIPINFO_TRANS)
 144         return ri->d.ktri->pctx;
 145     else if (ri->type == CMS_RECIPINFO_AGREE)
 146         return ri->d.kari->pctx;
 147     return NULL;
 148 }
 149
 150 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
 151 {
 152     CMS_ContentInfo *cms;
 153     CMS_EnvelopedData *env;
 154     cms = CMS_ContentInfo_new();
 155     if (cms == NULL)
 156         goto merr;
 157     env = cms_enveloped_data_init(cms);
 158     if (env == NULL)
 159         goto merr;
 160     if (!cms_EncryptedContent_init(env->encryptedContentInfo,
 161                                    cipher, NULL, 0))
 162         goto merr;
 163     return cms;
 164  merr:
 165     CMS_ContentInfo_free(cms);
 166     CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
 167     return NULL;
 168 }
 169
 170 /* Key Transport Recipient Info (KTRI) routines */
 171
 172 /* Initialise a ktri based on passed certificate and key */
 173
 174 static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
 175                                        EVP_PKEY *pk, unsigned int flags)
 176 {
 177     CMS_KeyTransRecipientInfo *ktri;
 178     int idtype;
 179
 180     ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
 181     if (!ri->d.ktri)
 182         return 0;
 183     ri->type = CMS_RECIPINFO_TRANS;
 184
 185     ktri = ri->d.ktri;
 186
 187     if (flags & CMS_USE_KEYID) {
 188         ktri->version = 2;
 189         idtype = CMS_RECIPINFO_KEYIDENTIFIER;
 190     } else {
 191         ktri->version = 0;
 192         idtype = CMS_RECIPINFO_ISSUER_SERIAL;
 193     }
 194
 195     /*
 196      * Not a typo: RecipientIdentifier and SignerIdentifier are the same
 197      * structure.
 198      */
 199
 200     if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
 201         return 0;
 202
 203     X509_up_ref(recip);
 204     CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 205     ktri->pkey = pk;
 206     ktri->recip = recip;
 207
 208     if (flags & CMS_KEY_PARAM) {
 209         ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 210         if (ktri->pctx == NULL)
 211             return 0;
 212         if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
 213             return 0;
 214     } else if (!cms_env_asn1_ctrl(ri, 0))
 215         return 0;
 216     return 1;
 217 }
 218
 219 /*
 220  * Add a recipient certificate using appropriate type of RecipientInfo
 221  */
 222
 223 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
 224                                            X509 *recip, unsigned int flags)
 225 {
 226     CMS_RecipientInfo *ri = NULL;
 227     CMS_EnvelopedData *env;
 228     EVP_PKEY *pk = NULL;
 229     env = cms_get0_enveloped(cms);
 230     if (!env)
 231         goto err;
 232
 233     /* Initialize recipient info */
 234     ri = M_ASN1_new_of(CMS_RecipientInfo);
 235     if (!ri)
 236         goto merr;
 237
 238     pk = X509_get0_pubkey(recip);
 239     if (!pk) {
 240         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, CMS_R_ERROR_GETTING_PUBLIC_KEY);
 241         goto err;
 242     }
 243
 244     switch (cms_pkey_get_ri_type(pk)) {
 245
 246     case CMS_RECIPINFO_TRANS:
 247         if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
 248             goto err;
 249         break;
 250
 251     case CMS_RECIPINFO_AGREE:
 252         if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
 253             goto err;
 254         break;
 255
 256     default:
 257         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
 258                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 259         goto err;
 260
 261     }
 262
 263     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 264         goto merr;
 265
 266     return ri;
 267
 268  merr:
 269     CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
 270  err:
 271     M_ASN1_free_of(ri, CMS_RecipientInfo);
 272     return NULL;
 273
 274 }
 275
 276 int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
 277                                      EVP_PKEY **pk, X509 **recip,
 278                                      X509_ALGOR **palg)
 279 {
 280     CMS_KeyTransRecipientInfo *ktri;
 281     if (ri->type != CMS_RECIPINFO_TRANS) {
 282         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
 283                CMS_R_NOT_KEY_TRANSPORT);
 284         return 0;
 285     }
 286
 287     ktri = ri->d.ktri;
 288
 289     if (pk)
 290         *pk = ktri->pkey;
 291     if (recip)
 292         *recip = ktri->recip;
 293     if (palg)
 294         *palg = ktri->keyEncryptionAlgorithm;
 295     return 1;
 296 }
 297
 298 int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 299                                           ASN1_OCTET_STRING **keyid,
 300                                           X509_NAME **issuer,
 301                                           ASN1_INTEGER **sno)
 302 {
 303     CMS_KeyTransRecipientInfo *ktri;
 304     if (ri->type != CMS_RECIPINFO_TRANS) {
 305         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
 306                CMS_R_NOT_KEY_TRANSPORT);
 307         return 0;
 308     }
 309     ktri = ri->d.ktri;
 310
 311     return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
 312 }
 313
 314 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
 315 {
 316     if (ri->type != CMS_RECIPINFO_TRANS) {
 317         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
 318                CMS_R_NOT_KEY_TRANSPORT);
 319         return -2;
 320     }
 321     return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
 322 }
 323
 324 int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
 325 {
 326     if (ri->type != CMS_RECIPINFO_TRANS) {
 327         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, CMS_R_NOT_KEY_TRANSPORT);
 328         return 0;
 329     }
 330     ri->d.ktri->pkey = pkey;
 331     return 1;
 332 }
 333
 334 /* Encrypt content key in key transport recipient info */
 335
 336 static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
 337                                           CMS_RecipientInfo *ri)
 338 {
 339     CMS_KeyTransRecipientInfo *ktri;
 340     CMS_EncryptedContentInfo *ec;
 341     EVP_PKEY_CTX *pctx;
 342     unsigned char *ek = NULL;
 343     size_t eklen;
 344
 345     int ret = 0;
 346
 347     if (ri->type != CMS_RECIPINFO_TRANS) {
 348         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_NOT_KEY_TRANSPORT);
 349         return 0;
 350     }
 351     ktri = ri->d.ktri;
 352     ec = cms->d.envelopedData->encryptedContentInfo;
 353
 354     pctx = ktri->pctx;
 355
 356     if (pctx) {
 357         if (!cms_env_asn1_ctrl(ri, 0))
 358             goto err;
 359     } else {
 360         pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 361         if (pctx == NULL)
 362             return 0;
 363
 364         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 365             goto err;
 366     }
 367
 368     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 369                           EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
 370         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
 371         goto err;
 372     }
 373
 374     if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
 375         goto err;
 376
 377     ek = OPENSSL_malloc(eklen);
 378
 379     if (ek == NULL) {
 380         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 381         goto err;
 382     }
 383
 384     if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
 385         goto err;
 386
 387     ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
 388     ek = NULL;
 389
 390     ret = 1;
 391
 392  err:
 393     EVP_PKEY_CTX_free(pctx);
 394     ktri->pctx = NULL;
 395     OPENSSL_free(ek);
 396     return ret;
 397
 398 }
 399
 400 /* Decrypt content key from KTRI */
 401
 402 static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
 403                                           CMS_RecipientInfo *ri)
 404 {
 405     CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
 406     EVP_PKEY *pkey = ktri->pkey;
 407     unsigned char *ek = NULL;
 408     size_t eklen;
 409     int ret = 0;
 410     CMS_EncryptedContentInfo *ec;
 411     ec = cms->d.envelopedData->encryptedContentInfo;
 412
 413     if (ktri->pkey == NULL) {
 414         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_NO_PRIVATE_KEY);
 415         return 0;
 416     }
 417
 418     ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
 419     if (ktri->pctx == NULL)
 420         return 0;
 421
 422     if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
 423         goto err;
 424
 425     if (!cms_env_asn1_ctrl(ri, 1))
 426         goto err;
 427
 428     if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
 429                           EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
 430         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
 431         goto err;
 432     }
 433
 434     if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
 435                          ktri->encryptedKey->data,
 436                          ktri->encryptedKey->length) <= 0)
 437         goto err;
 438
 439     ek = OPENSSL_malloc(eklen);
 440
 441     if (ek == NULL) {
 442         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 443         goto err;
 444     }
 445
 446     if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
 447                          ktri->encryptedKey->data,
 448                          ktri->encryptedKey->length) <= 0) {
 449         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
 450         goto err;
 451     }
 452
 453     ret = 1;
 454
 455     OPENSSL_clear_free(ec->key, ec->keylen);
 456     ec->key = ek;
 457     ec->keylen = eklen;
 458
 459  err:
 460     EVP_PKEY_CTX_free(ktri->pctx);
 461     ktri->pctx = NULL;
 462     if (!ret)
 463         OPENSSL_free(ek);
 464
 465     return ret;
 466 }
 467
 468 /* Key Encrypted Key (KEK) RecipientInfo routines */
 469
 470 int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
 471                                    const unsigned char *id, size_t idlen)
 472 {
 473     ASN1_OCTET_STRING tmp_os;
 474     CMS_KEKRecipientInfo *kekri;
 475     if (ri->type != CMS_RECIPINFO_KEK) {
 476         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
 477         return -2;
 478     }
 479     kekri = ri->d.kekri;
 480     tmp_os.type = V_ASN1_OCTET_STRING;
 481     tmp_os.flags = 0;
 482     tmp_os.data = (unsigned char *)id;
 483     tmp_os.length = (int)idlen;
 484     return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
 485 }
 486
 487 /* For now hard code AES key wrap info */
 488
 489 static size_t aes_wrap_keylen(int nid)
 490 {
 491     switch (nid) {
 492     case NID_id_aes128_wrap:
 493         return 16;
 494
 495     case NID_id_aes192_wrap:
 496         return 24;
 497
 498     case NID_id_aes256_wrap:
 499         return 32;
 500
 501     default:
 502         return 0;
 503     }
 504 }
 505
 506 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
 507                                           unsigned char *key, size_t keylen,
 508                                           unsigned char *id, size_t idlen,
 509                                           ASN1_GENERALIZEDTIME *date,
 510                                           ASN1_OBJECT *otherTypeId,
 511                                           ASN1_TYPE *otherType)
 512 {
 513     CMS_RecipientInfo *ri = NULL;
 514     CMS_EnvelopedData *env;
 515     CMS_KEKRecipientInfo *kekri;
 516     env = cms_get0_enveloped(cms);
 517     if (!env)
 518         goto err;
 519
 520     if (nid == NID_undef) {
 521         switch (keylen) {
 522         case 16:
 523             nid = NID_id_aes128_wrap;
 524             break;
 525
 526         case 24:
 527             nid = NID_id_aes192_wrap;
 528             break;
 529
 530         case 32:
 531             nid = NID_id_aes256_wrap;
 532             break;
 533
 534         default:
 535             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 536             goto err;
 537         }
 538
 539     } else {
 540
 541         size_t exp_keylen = aes_wrap_keylen(nid);
 542
 543         if (!exp_keylen) {
 544             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 545                    CMS_R_UNSUPPORTED_KEK_ALGORITHM);
 546             goto err;
 547         }
 548
 549         if (keylen != exp_keylen) {
 550             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 551             goto err;
 552         }
 553
 554     }
 555
 556     /* Initialize recipient info */
 557     ri = M_ASN1_new_of(CMS_RecipientInfo);
 558     if (!ri)
 559         goto merr;
 560
 561     ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
 562     if (!ri->d.kekri)
 563         goto merr;
 564     ri->type = CMS_RECIPINFO_KEK;
 565
 566     kekri = ri->d.kekri;
 567
 568     if (otherTypeId) {
 569         kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
 570         if (kekri->kekid->other == NULL)
 571             goto merr;
 572     }
 573
 574     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 575         goto merr;
 576
 577     /* After this point no calls can fail */
 578
 579     kekri->version = 4;
 580
 581     kekri->key = key;
 582     kekri->keylen = keylen;
 583
 584     ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
 585
 586     kekri->kekid->date = date;
 587
 588     if (kekri->kekid->other) {
 589         kekri->kekid->other->keyAttrId = otherTypeId;
 590         kekri->kekid->other->keyAttr = otherType;
 591     }
 592
 593     X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
 594                     OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
 595
 596     return ri;
 597
 598  merr:
 599     CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
 600  err:
 601     M_ASN1_free_of(ri, CMS_RecipientInfo);
 602     return NULL;
 603
 604 }
 605
 606 int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
 607                                     X509_ALGOR **palg,
 608                                     ASN1_OCTET_STRING **pid,
 609                                     ASN1_GENERALIZEDTIME **pdate,
 610                                     ASN1_OBJECT **potherid,
 611                                     ASN1_TYPE **pothertype)
 612 {
 613     CMS_KEKIdentifier *rkid;
 614     if (ri->type != CMS_RECIPINFO_KEK) {
 615         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
 616         return 0;
 617     }
 618     rkid = ri->d.kekri->kekid;
 619     if (palg)
 620         *palg = ri->d.kekri->keyEncryptionAlgorithm;
 621     if (pid)
 622         *pid = rkid->keyIdentifier;
 623     if (pdate)
 624         *pdate = rkid->date;
 625     if (potherid) {
 626         if (rkid->other)
 627             *potherid = rkid->other->keyAttrId;
 628         else
 629             *potherid = NULL;
 630     }
 631     if (pothertype) {
 632         if (rkid->other)
 633             *pothertype = rkid->other->keyAttr;
 634         else
 635             *pothertype = NULL;
 636     }
 637     return 1;
 638 }
 639
 640 int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
 641                                unsigned char *key, size_t keylen)
 642 {
 643     CMS_KEKRecipientInfo *kekri;
 644     if (ri->type != CMS_RECIPINFO_KEK) {
 645         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
 646         return 0;
 647     }
 648
 649     kekri = ri->d.kekri;
 650     kekri->key = key;
 651     kekri->keylen = keylen;
 652     return 1;
 653 }
 654
 655 /* Encrypt content key in KEK recipient info */
 656
 657 static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
 658                                            CMS_RecipientInfo *ri)
 659 {
 660     CMS_EncryptedContentInfo *ec;
 661     CMS_KEKRecipientInfo *kekri;
 662     AES_KEY actx;
 663     unsigned char *wkey = NULL;
 664     int wkeylen;
 665     int r = 0;
 666
 667     ec = cms->d.envelopedData->encryptedContentInfo;
 668
 669     kekri = ri->d.kekri;
 670
 671     if (!kekri->key) {
 672         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
 673         return 0;
 674     }
 675
 676     if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 677         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
 678                CMS_R_ERROR_SETTING_KEY);
 679         goto err;
 680     }
 681
 682     wkey = OPENSSL_malloc(ec->keylen + 8);
 683
 684     if (wkey == NULL) {
 685         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 686         goto err;
 687     }
 688
 689     wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
 690
 691     if (wkeylen <= 0) {
 692         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
 693         goto err;
 694     }
 695
 696     ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
 697
 698     r = 1;
 699
 700  err:
 701
 702     if (!r)
 703         OPENSSL_free(wkey);
 704     OPENSSL_cleanse(&actx, sizeof(actx));
 705
 706     return r;
 707
 708 }
 709
 710 /* Decrypt content key in KEK recipient info */
 711
 712 static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
 713                                            CMS_RecipientInfo *ri)
 714 {
 715     CMS_EncryptedContentInfo *ec;
 716     CMS_KEKRecipientInfo *kekri;
 717     AES_KEY actx;
 718     unsigned char *ukey = NULL;
 719     int ukeylen;
 720     int r = 0, wrap_nid;
 721
 722     ec = cms->d.envelopedData->encryptedContentInfo;
 723
 724     kekri = ri->d.kekri;
 725
 726     if (!kekri->key) {
 727         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
 728         return 0;
 729     }
 730
 731     wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
 732     if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
 733         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 734                CMS_R_INVALID_KEY_LENGTH);
 735         return 0;
 736     }
 737
 738     /* If encrypted key length is invalid don't bother */
 739
 740     if (kekri->encryptedKey->length < 16) {
 741         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 742                CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
 743         goto err;
 744     }
 745
 746     if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 747         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 748                CMS_R_ERROR_SETTING_KEY);
 749         goto err;
 750     }
 751
 752     ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
 753
 754     if (ukey == NULL) {
 755         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 756         goto err;
 757     }
 758
 759     ukeylen = AES_unwrap_key(&actx, NULL, ukey,
 760                              kekri->encryptedKey->data,
 761                              kekri->encryptedKey->length);
 762
 763     if (ukeylen <= 0) {
 764         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_UNWRAP_ERROR);
 765         goto err;
 766     }
 767
 768     ec->key = ukey;
 769     ec->keylen = ukeylen;
 770
 771     r = 1;
 772
 773  err:
 774
 775     if (!r)
 776         OPENSSL_free(ukey);
 777     OPENSSL_cleanse(&actx, sizeof(actx));
 778
 779     return r;
 780
 781 }
 782
 783 int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 784 {
 785     switch (ri->type) {
 786     case CMS_RECIPINFO_TRANS:
 787         return cms_RecipientInfo_ktri_decrypt(cms, ri);
 788
 789     case CMS_RECIPINFO_KEK:
 790         return cms_RecipientInfo_kekri_decrypt(cms, ri);
 791
 792     case CMS_RECIPINFO_PASS:
 793         return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
 794
 795     default:
 796         CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
 797                CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
 798         return 0;
 799     }
 800 }
 801
 802 int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 803 {
 804     switch (ri->type) {
 805     case CMS_RECIPINFO_TRANS:
 806         return cms_RecipientInfo_ktri_encrypt(cms, ri);
 807
 808     case CMS_RECIPINFO_AGREE:
 809         return cms_RecipientInfo_kari_encrypt(cms, ri);
 810
 811     case CMS_RECIPINFO_KEK:
 812         return cms_RecipientInfo_kekri_encrypt(cms, ri);
 813
 814     case CMS_RECIPINFO_PASS:
 815         return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
 816
 817     default:
 818         CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
 819                CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
 820         return 0;
 821     }
 822 }
 823
 824 /* Check structures and fixup version numbers (if necessary) */
 825
 826 static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
 827 {
 828     CMS_OriginatorInfo *org = env->originatorInfo;
 829     int i;
 830     if (org == NULL)
 831         return;
 832     for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
 833         CMS_CertificateChoices *cch;
 834         cch = sk_CMS_CertificateChoices_value(org->certificates, i);
 835         if (cch->type == CMS_CERTCHOICE_OTHER) {
 836             env->version = 4;
 837             return;
 838         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
 839             if (env->version < 3)
 840                 env->version = 3;
 841         }
 842     }
 843
 844     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
 845         CMS_RevocationInfoChoice *rch;
 846         rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
 847         if (rch->type == CMS_REVCHOICE_OTHER) {
 848             env->version = 4;
 849             return;
 850         }
 851     }
 852 }
 853
 854 static void cms_env_set_version(CMS_EnvelopedData *env)
 855 {
 856     int i;
 857     CMS_RecipientInfo *ri;
 858
 859     /*
 860      * Can't set version higher than 4 so if 4 or more already nothing to do.
 861      */
 862     if (env->version >= 4)
 863         return;
 864
 865     cms_env_set_originfo_version(env);
 866
 867     if (env->version >= 3)
 868         return;
 869
 870     for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
 871         ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
 872         if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
 873             env->version = 3;
 874             return;
 875         } else if (ri->type != CMS_RECIPINFO_TRANS
 876                    || ri->d.ktri->version != 0) {
 877             env->version = 2;
 878         }
 879     }
 880     if (env->version == 2)
 881         return;
 882     if (env->originatorInfo || env->unprotectedAttrs)
 883         env->version = 2;
 884     env->version = 0;
 885 }
 886
 887 BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
 888 {
 889     CMS_EncryptedContentInfo *ec;
 890     STACK_OF(CMS_RecipientInfo) *rinfos;
 891     CMS_RecipientInfo *ri;
 892     int i, ok = 0;
 893     BIO *ret;
 894
 895     /* Get BIO first to set up key */
 896
 897     ec = cms->d.envelopedData->encryptedContentInfo;
 898     ret = cms_EncryptedContent_init_bio(ec);
 899
 900     /* If error or no cipher end of processing */
 901
 902     if (!ret || !ec->cipher)
 903         return ret;
 904
 905     /* Now encrypt content key according to each RecipientInfo type */
 906
 907     rinfos = cms->d.envelopedData->recipientInfos;
 908
 909     for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
 910         ri = sk_CMS_RecipientInfo_value(rinfos, i);
 911         if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
 912             CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
 913                    CMS_R_ERROR_SETTING_RECIPIENTINFO);
 914             goto err;
 915         }
 916     }
 917     cms_env_set_version(cms->d.envelopedData);
 918
 919     ok = 1;
 920
 921  err:
 922     ec->cipher = NULL;
 923     OPENSSL_clear_free(ec->key, ec->keylen);
 924     ec->key = NULL;
 925     ec->keylen = 0;
 926     if (ok)
 927         return ret;
 928     BIO_free(ret);
 929     return NULL;
 930
 931 }
 932
 933 /*
 934  * Get RecipientInfo type (if any) supported by a key (public or private). To
 935  * retain compatibility with previous behaviour if the ctrl value isn't
 936  * supported we assume key transport.
 937  */
 938 int cms_pkey_get_ri_type(EVP_PKEY *pk)
 939 {
 940     if (pk->ameth && pk->ameth->pkey_ctrl) {
 941         int i, r;
 942         i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
 943         if (i > 0)
 944             return r;
 945     }
 946     return CMS_RECIPINFO_TRANS;
 947 }