crypto/cms/cms_env.c

   1 /*
   2  * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib.h"
  11 #include <openssl/asn1t.h>
  12 #include <openssl/pem.h>
  13 #include <openssl/x509v3.h>
  14 #include <openssl/err.h>
  15 #include <openssl/cms.h>
  16 #include <openssl/rand.h>
  17 #include <openssl/aes.h>
  18 #include "cms_lcl.h"
  19 #include "internal/asn1_int.h"
  20 #include "internal/evp_int.h"
  21
  22 /* CMS EnvelopedData Utilities */
  23
  24 CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
  25 {
  26     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
  27         CMSerr(CMS_F_CMS_GET0_ENVELOPED,
  28                CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
  29         return NULL;
  30     }
  31     return cms->d.envelopedData;
  32 }
  33
  34 static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
  35 {
  36     if (cms->d.other == NULL) {
  37         cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
  38         if (!cms->d.envelopedData) {
  39             CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  40             return NULL;
  41         }
  42         cms->d.envelopedData->version = 0;
  43         cms->d.envelopedData->encryptedContentInfo->contentType =
  44             OBJ_nid2obj(NID_pkcs7_data);
  45         ASN1_OBJECT_free(cms->contentType);
  46         cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
  47         return cms->d.envelopedData;
  48     }
  49     return cms_get0_enveloped(cms);
  50 }
  51
  52 int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
  53 {
  54     EVP_PKEY *pkey;
  55     int i;
  56     if (ri->type == CMS_RECIPINFO_TRANS)
  57         pkey = ri->d.ktri->pkey;
  58     else if (ri->type == CMS_RECIPINFO_AGREE) {
  59         EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
  60         if (!pctx)
  61             return 0;
  62         pkey = EVP_PKEY_CTX_get0_pkey(pctx);
  63         if (!pkey)
  64             return 0;
  65     } else
  66         return 0;
  67     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
  68         return 1;
  69     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
  70     if (i == -2) {
  71         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
  72                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
  73         return 0;
  74     }
  75     if (i <= 0) {
  76         CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
  77         return 0;
  78     }
  79     return 1;
  80 }
  81
  82 STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
  83 {
  84     CMS_EnvelopedData *env;
  85     env = cms_get0_enveloped(cms);
  86     if (!env)
  87         return NULL;
  88     return env->recipientInfos;
  89 }
  90
  91 int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
  92 {
  93     return ri->type;
  94 }
  95
  96 EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
  97 {
  98     if (ri->type == CMS_RECIPINFO_TRANS)
  99         return ri->d.ktri->pctx;
 100     else if (ri->type == CMS_RECIPINFO_AGREE)
 101         return ri->d.kari->pctx;
 102     return NULL;
 103 }
 104
 105 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
 106 {
 107     CMS_ContentInfo *cms;
 108     CMS_EnvelopedData *env;
 109     cms = CMS_ContentInfo_new();
 110     if (cms == NULL)
 111         goto merr;
 112     env = cms_enveloped_data_init(cms);
 113     if (env == NULL)
 114         goto merr;
 115     if (!cms_EncryptedContent_init(env->encryptedContentInfo,
 116                                    cipher, NULL, 0))
 117         goto merr;
 118     return cms;
 119  merr:
 120     CMS_ContentInfo_free(cms);
 121     CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
 122     return NULL;
 123 }
 124
 125 /* Key Transport Recipient Info (KTRI) routines */
 126
 127 /* Initialise a ktri based on passed certificate and key */
 128
 129 static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
 130                                        EVP_PKEY *pk, unsigned int flags)
 131 {
 132     CMS_KeyTransRecipientInfo *ktri;
 133     int idtype;
 134
 135     ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
 136     if (!ri->d.ktri)
 137         return 0;
 138     ri->type = CMS_RECIPINFO_TRANS;
 139
 140     ktri = ri->d.ktri;
 141
 142     if (flags & CMS_USE_KEYID) {
 143         ktri->version = 2;
 144         idtype = CMS_RECIPINFO_KEYIDENTIFIER;
 145     } else {
 146         ktri->version = 0;
 147         idtype = CMS_RECIPINFO_ISSUER_SERIAL;
 148     }
 149
 150     /*
 151      * Not a typo: RecipientIdentifier and SignerIdentifier are the same
 152      * structure.
 153      */
 154
 155     if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
 156         return 0;
 157
 158     X509_up_ref(recip);
 159     EVP_PKEY_up_ref(pk);
 160
 161     ktri->pkey = pk;
 162     ktri->recip = recip;
 163
 164     if (flags & CMS_KEY_PARAM) {
 165         ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 166         if (ktri->pctx == NULL)
 167             return 0;
 168         if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
 169             return 0;
 170     } else if (!cms_env_asn1_ctrl(ri, 0))
 171         return 0;
 172     return 1;
 173 }
 174
 175 /*
 176  * Add a recipient certificate using appropriate type of RecipientInfo
 177  */
 178
 179 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
 180                                            X509 *recip, unsigned int flags)
 181 {
 182     CMS_RecipientInfo *ri = NULL;
 183     CMS_EnvelopedData *env;
 184     EVP_PKEY *pk = NULL;
 185     env = cms_get0_enveloped(cms);
 186     if (!env)
 187         goto err;
 188
 189     /* Initialize recipient info */
 190     ri = M_ASN1_new_of(CMS_RecipientInfo);
 191     if (!ri)
 192         goto merr;
 193
 194     pk = X509_get0_pubkey(recip);
 195     if (!pk) {
 196         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, CMS_R_ERROR_GETTING_PUBLIC_KEY);
 197         goto err;
 198     }
 199
 200     switch (cms_pkey_get_ri_type(pk)) {
 201
 202     case CMS_RECIPINFO_TRANS:
 203         if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
 204             goto err;
 205         break;
 206
 207     case CMS_RECIPINFO_AGREE:
 208         if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
 209             goto err;
 210         break;
 211
 212     default:
 213         CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
 214                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 215         goto err;
 216
 217     }
 218
 219     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 220         goto merr;
 221
 222     return ri;
 223
 224  merr:
 225     CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
 226  err:
 227     M_ASN1_free_of(ri, CMS_RecipientInfo);
 228     return NULL;
 229
 230 }
 231
 232 int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
 233                                      EVP_PKEY **pk, X509 **recip,
 234                                      X509_ALGOR **palg)
 235 {
 236     CMS_KeyTransRecipientInfo *ktri;
 237     if (ri->type != CMS_RECIPINFO_TRANS) {
 238         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
 239                CMS_R_NOT_KEY_TRANSPORT);
 240         return 0;
 241     }
 242
 243     ktri = ri->d.ktri;
 244
 245     if (pk)
 246         *pk = ktri->pkey;
 247     if (recip)
 248         *recip = ktri->recip;
 249     if (palg)
 250         *palg = ktri->keyEncryptionAlgorithm;
 251     return 1;
 252 }
 253
 254 int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 255                                           ASN1_OCTET_STRING **keyid,
 256                                           X509_NAME **issuer,
 257                                           ASN1_INTEGER **sno)
 258 {
 259     CMS_KeyTransRecipientInfo *ktri;
 260     if (ri->type != CMS_RECIPINFO_TRANS) {
 261         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
 262                CMS_R_NOT_KEY_TRANSPORT);
 263         return 0;
 264     }
 265     ktri = ri->d.ktri;
 266
 267     return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
 268 }
 269
 270 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
 271 {
 272     if (ri->type != CMS_RECIPINFO_TRANS) {
 273         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
 274                CMS_R_NOT_KEY_TRANSPORT);
 275         return -2;
 276     }
 277     return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
 278 }
 279
 280 int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
 281 {
 282     if (ri->type != CMS_RECIPINFO_TRANS) {
 283         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, CMS_R_NOT_KEY_TRANSPORT);
 284         return 0;
 285     }
 286     ri->d.ktri->pkey = pkey;
 287     return 1;
 288 }
 289
 290 /* Encrypt content key in key transport recipient info */
 291
 292 static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
 293                                           CMS_RecipientInfo *ri)
 294 {
 295     CMS_KeyTransRecipientInfo *ktri;
 296     CMS_EncryptedContentInfo *ec;
 297     EVP_PKEY_CTX *pctx;
 298     unsigned char *ek = NULL;
 299     size_t eklen;
 300
 301     int ret = 0;
 302
 303     if (ri->type != CMS_RECIPINFO_TRANS) {
 304         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_NOT_KEY_TRANSPORT);
 305         return 0;
 306     }
 307     ktri = ri->d.ktri;
 308     ec = cms->d.envelopedData->encryptedContentInfo;
 309
 310     pctx = ktri->pctx;
 311
 312     if (pctx) {
 313         if (!cms_env_asn1_ctrl(ri, 0))
 314             goto err;
 315     } else {
 316         pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
 317         if (pctx == NULL)
 318             return 0;
 319
 320         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 321             goto err;
 322     }
 323
 324     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 325                           EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
 326         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
 327         goto err;
 328     }
 329
 330     if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
 331         goto err;
 332
 333     ek = OPENSSL_malloc(eklen);
 334
 335     if (ek == NULL) {
 336         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 337         goto err;
 338     }
 339
 340     if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
 341         goto err;
 342
 343     ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
 344     ek = NULL;
 345
 346     ret = 1;
 347
 348  err:
 349     EVP_PKEY_CTX_free(pctx);
 350     ktri->pctx = NULL;
 351     OPENSSL_free(ek);
 352     return ret;
 353
 354 }
 355
 356 /* Decrypt content key from KTRI */
 357
 358 static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
 359                                           CMS_RecipientInfo *ri)
 360 {
 361     CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
 362     EVP_PKEY *pkey = ktri->pkey;
 363     unsigned char *ek = NULL;
 364     size_t eklen;
 365     int ret = 0;
 366     CMS_EncryptedContentInfo *ec;
 367     ec = cms->d.envelopedData->encryptedContentInfo;
 368
 369     if (ktri->pkey == NULL) {
 370         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_NO_PRIVATE_KEY);
 371         return 0;
 372     }
 373
 374     ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
 375     if (ktri->pctx == NULL)
 376         return 0;
 377
 378     if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
 379         goto err;
 380
 381     if (!cms_env_asn1_ctrl(ri, 1))
 382         goto err;
 383
 384     if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
 385                           EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
 386         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
 387         goto err;
 388     }
 389
 390     if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
 391                          ktri->encryptedKey->data,
 392                          ktri->encryptedKey->length) <= 0)
 393         goto err;
 394
 395     ek = OPENSSL_malloc(eklen);
 396
 397     if (ek == NULL) {
 398         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 399         goto err;
 400     }
 401
 402     if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
 403                          ktri->encryptedKey->data,
 404                          ktri->encryptedKey->length) <= 0) {
 405         CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
 406         goto err;
 407     }
 408
 409     ret = 1;
 410
 411     OPENSSL_clear_free(ec->key, ec->keylen);
 412     ec->key = ek;
 413     ec->keylen = eklen;
 414
 415  err:
 416     EVP_PKEY_CTX_free(ktri->pctx);
 417     ktri->pctx = NULL;
 418     if (!ret)
 419         OPENSSL_free(ek);
 420
 421     return ret;
 422 }
 423
 424 /* Key Encrypted Key (KEK) RecipientInfo routines */
 425
 426 int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
 427                                    const unsigned char *id, size_t idlen)
 428 {
 429     ASN1_OCTET_STRING tmp_os;
 430     CMS_KEKRecipientInfo *kekri;
 431     if (ri->type != CMS_RECIPINFO_KEK) {
 432         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
 433         return -2;
 434     }
 435     kekri = ri->d.kekri;
 436     tmp_os.type = V_ASN1_OCTET_STRING;
 437     tmp_os.flags = 0;
 438     tmp_os.data = (unsigned char *)id;
 439     tmp_os.length = (int)idlen;
 440     return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
 441 }
 442
 443 /* For now hard code AES key wrap info */
 444
 445 static size_t aes_wrap_keylen(int nid)
 446 {
 447     switch (nid) {
 448     case NID_id_aes128_wrap:
 449         return 16;
 450
 451     case NID_id_aes192_wrap:
 452         return 24;
 453
 454     case NID_id_aes256_wrap:
 455         return 32;
 456
 457     default:
 458         return 0;
 459     }
 460 }
 461
 462 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
 463                                           unsigned char *key, size_t keylen,
 464                                           unsigned char *id, size_t idlen,
 465                                           ASN1_GENERALIZEDTIME *date,
 466                                           ASN1_OBJECT *otherTypeId,
 467                                           ASN1_TYPE *otherType)
 468 {
 469     CMS_RecipientInfo *ri = NULL;
 470     CMS_EnvelopedData *env;
 471     CMS_KEKRecipientInfo *kekri;
 472     env = cms_get0_enveloped(cms);
 473     if (!env)
 474         goto err;
 475
 476     if (nid == NID_undef) {
 477         switch (keylen) {
 478         case 16:
 479             nid = NID_id_aes128_wrap;
 480             break;
 481
 482         case 24:
 483             nid = NID_id_aes192_wrap;
 484             break;
 485
 486         case 32:
 487             nid = NID_id_aes256_wrap;
 488             break;
 489
 490         default:
 491             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 492             goto err;
 493         }
 494
 495     } else {
 496
 497         size_t exp_keylen = aes_wrap_keylen(nid);
 498
 499         if (!exp_keylen) {
 500             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
 501                    CMS_R_UNSUPPORTED_KEK_ALGORITHM);
 502             goto err;
 503         }
 504
 505         if (keylen != exp_keylen) {
 506             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
 507             goto err;
 508         }
 509
 510     }
 511
 512     /* Initialize recipient info */
 513     ri = M_ASN1_new_of(CMS_RecipientInfo);
 514     if (!ri)
 515         goto merr;
 516
 517     ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
 518     if (!ri->d.kekri)
 519         goto merr;
 520     ri->type = CMS_RECIPINFO_KEK;
 521
 522     kekri = ri->d.kekri;
 523
 524     if (otherTypeId) {
 525         kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
 526         if (kekri->kekid->other == NULL)
 527             goto merr;
 528     }
 529
 530     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 531         goto merr;
 532
 533     /* After this point no calls can fail */
 534
 535     kekri->version = 4;
 536
 537     kekri->key = key;
 538     kekri->keylen = keylen;
 539
 540     ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
 541
 542     kekri->kekid->date = date;
 543
 544     if (kekri->kekid->other) {
 545         kekri->kekid->other->keyAttrId = otherTypeId;
 546         kekri->kekid->other->keyAttr = otherType;
 547     }
 548
 549     X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
 550                     OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
 551
 552     return ri;
 553
 554  merr:
 555     CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
 556  err:
 557     M_ASN1_free_of(ri, CMS_RecipientInfo);
 558     return NULL;
 559
 560 }
 561
 562 int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
 563                                     X509_ALGOR **palg,
 564                                     ASN1_OCTET_STRING **pid,
 565                                     ASN1_GENERALIZEDTIME **pdate,
 566                                     ASN1_OBJECT **potherid,
 567                                     ASN1_TYPE **pothertype)
 568 {
 569     CMS_KEKIdentifier *rkid;
 570     if (ri->type != CMS_RECIPINFO_KEK) {
 571         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
 572         return 0;
 573     }
 574     rkid = ri->d.kekri->kekid;
 575     if (palg)
 576         *palg = ri->d.kekri->keyEncryptionAlgorithm;
 577     if (pid)
 578         *pid = rkid->keyIdentifier;
 579     if (pdate)
 580         *pdate = rkid->date;
 581     if (potherid) {
 582         if (rkid->other)
 583             *potherid = rkid->other->keyAttrId;
 584         else
 585             *potherid = NULL;
 586     }
 587     if (pothertype) {
 588         if (rkid->other)
 589             *pothertype = rkid->other->keyAttr;
 590         else
 591             *pothertype = NULL;
 592     }
 593     return 1;
 594 }
 595
 596 int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
 597                                unsigned char *key, size_t keylen)
 598 {
 599     CMS_KEKRecipientInfo *kekri;
 600     if (ri->type != CMS_RECIPINFO_KEK) {
 601         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
 602         return 0;
 603     }
 604
 605     kekri = ri->d.kekri;
 606     kekri->key = key;
 607     kekri->keylen = keylen;
 608     return 1;
 609 }
 610
 611 /* Encrypt content key in KEK recipient info */
 612
 613 static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
 614                                            CMS_RecipientInfo *ri)
 615 {
 616     CMS_EncryptedContentInfo *ec;
 617     CMS_KEKRecipientInfo *kekri;
 618     AES_KEY actx;
 619     unsigned char *wkey = NULL;
 620     int wkeylen;
 621     int r = 0;
 622
 623     ec = cms->d.envelopedData->encryptedContentInfo;
 624
 625     kekri = ri->d.kekri;
 626
 627     if (!kekri->key) {
 628         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
 629         return 0;
 630     }
 631
 632     if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 633         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
 634                CMS_R_ERROR_SETTING_KEY);
 635         goto err;
 636     }
 637
 638     wkey = OPENSSL_malloc(ec->keylen + 8);
 639
 640     if (wkey == NULL) {
 641         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
 642         goto err;
 643     }
 644
 645     wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
 646
 647     if (wkeylen <= 0) {
 648         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
 649         goto err;
 650     }
 651
 652     ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
 653
 654     r = 1;
 655
 656  err:
 657
 658     if (!r)
 659         OPENSSL_free(wkey);
 660     OPENSSL_cleanse(&actx, sizeof(actx));
 661
 662     return r;
 663
 664 }
 665
 666 /* Decrypt content key in KEK recipient info */
 667
 668 static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
 669                                            CMS_RecipientInfo *ri)
 670 {
 671     CMS_EncryptedContentInfo *ec;
 672     CMS_KEKRecipientInfo *kekri;
 673     AES_KEY actx;
 674     unsigned char *ukey = NULL;
 675     int ukeylen;
 676     int r = 0, wrap_nid;
 677
 678     ec = cms->d.envelopedData->encryptedContentInfo;
 679
 680     kekri = ri->d.kekri;
 681
 682     if (!kekri->key) {
 683         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
 684         return 0;
 685     }
 686
 687     wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
 688     if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
 689         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 690                CMS_R_INVALID_KEY_LENGTH);
 691         return 0;
 692     }
 693
 694     /* If encrypted key length is invalid don't bother */
 695
 696     if (kekri->encryptedKey->length < 16) {
 697         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 698                CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
 699         goto err;
 700     }
 701
 702     if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
 703         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
 704                CMS_R_ERROR_SETTING_KEY);
 705         goto err;
 706     }
 707
 708     ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
 709
 710     if (ukey == NULL) {
 711         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, ERR_R_MALLOC_FAILURE);
 712         goto err;
 713     }
 714
 715     ukeylen = AES_unwrap_key(&actx, NULL, ukey,
 716                              kekri->encryptedKey->data,
 717                              kekri->encryptedKey->length);
 718
 719     if (ukeylen <= 0) {
 720         CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_UNWRAP_ERROR);
 721         goto err;
 722     }
 723
 724     ec->key = ukey;
 725     ec->keylen = ukeylen;
 726
 727     r = 1;
 728
 729  err:
 730
 731     if (!r)
 732         OPENSSL_free(ukey);
 733     OPENSSL_cleanse(&actx, sizeof(actx));
 734
 735     return r;
 736
 737 }
 738
 739 int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 740 {
 741     switch (ri->type) {
 742     case CMS_RECIPINFO_TRANS:
 743         return cms_RecipientInfo_ktri_decrypt(cms, ri);
 744
 745     case CMS_RECIPINFO_KEK:
 746         return cms_RecipientInfo_kekri_decrypt(cms, ri);
 747
 748     case CMS_RECIPINFO_PASS:
 749         return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
 750
 751     default:
 752         CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
 753                CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
 754         return 0;
 755     }
 756 }
 757
 758 int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
 759 {
 760     switch (ri->type) {
 761     case CMS_RECIPINFO_TRANS:
 762         return cms_RecipientInfo_ktri_encrypt(cms, ri);
 763
 764     case CMS_RECIPINFO_AGREE:
 765         return cms_RecipientInfo_kari_encrypt(cms, ri);
 766
 767     case CMS_RECIPINFO_KEK:
 768         return cms_RecipientInfo_kekri_encrypt(cms, ri);
 769
 770     case CMS_RECIPINFO_PASS:
 771         return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
 772
 773     default:
 774         CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
 775                CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
 776         return 0;
 777     }
 778 }
 779
 780 /* Check structures and fixup version numbers (if necessary) */
 781
 782 static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
 783 {
 784     CMS_OriginatorInfo *org = env->originatorInfo;
 785     int i;
 786     if (org == NULL)
 787         return;
 788     for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
 789         CMS_CertificateChoices *cch;
 790         cch = sk_CMS_CertificateChoices_value(org->certificates, i);
 791         if (cch->type == CMS_CERTCHOICE_OTHER) {
 792             env->version = 4;
 793             return;
 794         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
 795             if (env->version < 3)
 796                 env->version = 3;
 797         }
 798     }
 799
 800     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
 801         CMS_RevocationInfoChoice *rch;
 802         rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
 803         if (rch->type == CMS_REVCHOICE_OTHER) {
 804             env->version = 4;
 805             return;
 806         }
 807     }
 808 }
 809
 810 static void cms_env_set_version(CMS_EnvelopedData *env)
 811 {
 812     int i;
 813     CMS_RecipientInfo *ri;
 814
 815     /*
 816      * Can't set version higher than 4 so if 4 or more already nothing to do.
 817      */
 818     if (env->version >= 4)
 819         return;
 820
 821     cms_env_set_originfo_version(env);
 822
 823     if (env->version >= 3)
 824         return;
 825
 826     for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
 827         ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
 828         if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
 829             env->version = 3;
 830             return;
 831         } else if (ri->type != CMS_RECIPINFO_TRANS
 832                    || ri->d.ktri->version != 0) {
 833             env->version = 2;
 834         }
 835     }
 836     if (env->version == 2)
 837         return;
 838     if (env->originatorInfo || env->unprotectedAttrs)
 839         env->version = 2;
 840     env->version = 0;
 841 }
 842
 843 BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
 844 {
 845     CMS_EncryptedContentInfo *ec;
 846     STACK_OF(CMS_RecipientInfo) *rinfos;
 847     CMS_RecipientInfo *ri;
 848     int i, ok = 0;
 849     BIO *ret;
 850
 851     /* Get BIO first to set up key */
 852
 853     ec = cms->d.envelopedData->encryptedContentInfo;
 854     ret = cms_EncryptedContent_init_bio(ec);
 855
 856     /* If error or no cipher end of processing */
 857
 858     if (!ret || !ec->cipher)
 859         return ret;
 860
 861     /* Now encrypt content key according to each RecipientInfo type */
 862
 863     rinfos = cms->d.envelopedData->recipientInfos;
 864
 865     for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
 866         ri = sk_CMS_RecipientInfo_value(rinfos, i);
 867         if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
 868             CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
 869                    CMS_R_ERROR_SETTING_RECIPIENTINFO);
 870             goto err;
 871         }
 872     }
 873     cms_env_set_version(cms->d.envelopedData);
 874
 875     ok = 1;
 876
 877  err:
 878     ec->cipher = NULL;
 879     OPENSSL_clear_free(ec->key, ec->keylen);
 880     ec->key = NULL;
 881     ec->keylen = 0;
 882     if (ok)
 883         return ret;
 884     BIO_free(ret);
 885     return NULL;
 886
 887 }
 888
 889 /*
 890  * Get RecipientInfo type (if any) supported by a key (public or private). To
 891  * retain compatibility with previous behaviour if the ctrl value isn't
 892  * supported we assume key transport.
 893  */
 894 int cms_pkey_get_ri_type(EVP_PKEY *pk)
 895 {
 896     if (pk->ameth && pk->ameth->pkey_ctrl) {
 897         int i, r;
 898         i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
 899         if (i > 0)
 900             return r;
 901     }
 902     return CMS_RECIPINFO_TRANS;
 903 }