crypto/cms/cms_pwri.c

   1 /* crypto/cms/cms_pwri.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2009 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 "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 "asn1_locl.h"
  65
  66 int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri,
  67                                     unsigned char *pass, ossl_ssize_t passlen)
  68 {
  69     CMS_PasswordRecipientInfo *pwri;
  70     if (ri->type != CMS_RECIPINFO_PASS) {
  71         CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI);
  72         return 0;
  73     }
  74
  75     pwri = ri->d.pwri;
  76     pwri->pass = pass;
  77     if (pass && passlen < 0)
  78         passlen = strlen((char *)pass);
  79     pwri->passlen = passlen;
  80     return 1;
  81 }
  82
  83 CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms,
  84                                                int iter, int wrap_nid,
  85                                                int pbe_nid,
  86                                                unsigned char *pass,
  87                                                ossl_ssize_t passlen,
  88                                                const EVP_CIPHER *kekciph)
  89 {
  90     CMS_RecipientInfo *ri = NULL;
  91     CMS_EnvelopedData *env;
  92     CMS_PasswordRecipientInfo *pwri;
  93     EVP_CIPHER_CTX ctx;
  94     X509_ALGOR *encalg = NULL;
  95     unsigned char iv[EVP_MAX_IV_LENGTH];
  96     int ivlen;
  97
  98     env = cms_get0_enveloped(cms);
  99     if (!env)
 100         return NULL;
 101
 102     if (wrap_nid <= 0)
 103         wrap_nid = NID_id_alg_PWRI_KEK;
 104
 105     if (pbe_nid <= 0)
 106         pbe_nid = NID_id_pbkdf2;
 107
 108     /* Get from enveloped data */
 109     if (kekciph == NULL)
 110         kekciph = env->encryptedContentInfo->cipher;
 111
 112     if (kekciph == NULL) {
 113         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
 114         return NULL;
 115     }
 116     if (wrap_nid != NID_id_alg_PWRI_KEK) {
 117         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
 118                CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
 119         return NULL;
 120     }
 121
 122     /* Setup algorithm identifier for cipher */
 123     encalg = X509_ALGOR_new();
 124     EVP_CIPHER_CTX_init(&ctx);
 125
 126     if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0) {
 127         CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
 128         goto err;
 129     }
 130
 131     ivlen = EVP_CIPHER_CTX_iv_length(&ctx);
 132
 133     if (ivlen > 0) {
 134         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
 135             goto err;
 136         if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0) {
 137             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
 138             goto err;
 139         }
 140         encalg->parameter = ASN1_TYPE_new();
 141         if (!encalg->parameter) {
 142             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
 143             goto err;
 144         }
 145         if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0) {
 146             CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
 147                    CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 148             goto err;
 149         }
 150     }
 151
 152     encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
 153
 154     EVP_CIPHER_CTX_cleanup(&ctx);
 155
 156     /* Initialize recipient info */
 157     ri = M_ASN1_new_of(CMS_RecipientInfo);
 158     if (!ri)
 159         goto merr;
 160
 161     ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
 162     if (!ri->d.pwri)
 163         goto merr;
 164     ri->type = CMS_RECIPINFO_PASS;
 165
 166     pwri = ri->d.pwri;
 167     /* Since this is overwritten, free up empty structure already there */
 168     X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
 169     pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
 170     if (!pwri->keyEncryptionAlgorithm)
 171         goto merr;
 172     pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
 173     pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
 174     if (!pwri->keyEncryptionAlgorithm->parameter)
 175         goto merr;
 176
 177     if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
 178                         &pwri->keyEncryptionAlgorithm->parameter->
 179                         value.sequence))
 180          goto merr;
 181     pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
 182
 183     X509_ALGOR_free(encalg);
 184     encalg = NULL;
 185
 186     /* Setup PBE algorithm */
 187
 188     pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
 189
 190     if (!pwri->keyDerivationAlgorithm)
 191         goto err;
 192
 193     CMS_RecipientInfo_set0_password(ri, pass, passlen);
 194     pwri->version = 0;
 195
 196     if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
 197         goto merr;
 198
 199     return ri;
 200
 201  merr:
 202     CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
 203  err:
 204     EVP_CIPHER_CTX_cleanup(&ctx);
 205     if (ri)
 206         M_ASN1_free_of(ri, CMS_RecipientInfo);
 207     if (encalg)
 208         X509_ALGOR_free(encalg);
 209     return NULL;
 210
 211 }
 212
 213 /*
 214  * This is an implementation of the key wrapping mechanism in RFC3211, at
 215  * some point this should go into EVP.
 216  */
 217
 218 static int kek_unwrap_key(unsigned char *out, size_t *outlen,
 219                           const unsigned char *in, size_t inlen,
 220                           EVP_CIPHER_CTX *ctx)
 221 {
 222     size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
 223     unsigned char *tmp;
 224     int outl, rv = 0;
 225     if (inlen < 2 * blocklen) {
 226         /* too small */
 227         return 0;
 228     }
 229     if (inlen % blocklen) {
 230         /* Invalid size */
 231         return 0;
 232     }
 233     tmp = OPENSSL_malloc(inlen);
 234     if(!tmp)
 235         return 0;
 236     /* setup IV by decrypting last two blocks */
 237     if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
 238                            in + inlen - 2 * blocklen, blocklen * 2)
 239         /*
 240          * Do a decrypt of last decrypted block to set IV to correct value
 241          * output it to start of buffer so we don't corrupt decrypted block
 242          * this works because buffer is at least two block lengths long.
 243          */
 244         || !EVP_DecryptUpdate(ctx, tmp, &outl,
 245                               tmp + inlen - blocklen, blocklen)
 246         /* Can now decrypt first n - 1 blocks */
 247         || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
 248
 249         /* Reset IV to original value */
 250         || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
 251         /* Decrypt again */
 252         || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
 253         goto err;
 254     /* Check check bytes */
 255     if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
 256         /* Check byte failure */
 257         goto err;
 258     }
 259     if (inlen < (size_t)(tmp[0] - 4)) {
 260         /* Invalid length value */
 261         goto err;
 262     }
 263     *outlen = (size_t)tmp[0];
 264     memcpy(out, tmp + 4, *outlen);
 265     rv = 1;
 266  err:
 267     OPENSSL_cleanse(tmp, inlen);
 268     OPENSSL_free(tmp);
 269     return rv;
 270
 271 }
 272
 273 static int kek_wrap_key(unsigned char *out, size_t *outlen,
 274                         const unsigned char *in, size_t inlen,
 275                         EVP_CIPHER_CTX *ctx)
 276 {
 277     size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
 278     size_t olen;
 279     int dummy;
 280     /*
 281      * First decide length of output buffer: need header and round up to
 282      * multiple of block length.
 283      */
 284     olen = (inlen + 4 + blocklen - 1) / blocklen;
 285     olen *= blocklen;
 286     if (olen < 2 * blocklen) {
 287         /* Key too small */
 288         return 0;
 289     }
 290     if (inlen > 0xFF) {
 291         /* Key too large */
 292         return 0;
 293     }
 294     if (out) {
 295         /* Set header */
 296         out[0] = (unsigned char)inlen;
 297         out[1] = in[0] ^ 0xFF;
 298         out[2] = in[1] ^ 0xFF;
 299         out[3] = in[2] ^ 0xFF;
 300         memcpy(out + 4, in, inlen);
 301         /* Add random padding to end */
 302         if (olen > inlen + 4)
 303             RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen);
 304         /* Encrypt twice */
 305         if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen)
 306             || !EVP_EncryptUpdate(ctx, out, &dummy, out, olen))
 307             return 0;
 308     }
 309
 310     *outlen = olen;
 311
 312     return 1;
 313 }
 314
 315 /* Encrypt/Decrypt content key in PWRI recipient info */
 316
 317 int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
 318                                  int en_de)
 319 {
 320     CMS_EncryptedContentInfo *ec;
 321     CMS_PasswordRecipientInfo *pwri;
 322     const unsigned char *p = NULL;
 323     int plen;
 324     int r = 0;
 325     X509_ALGOR *algtmp, *kekalg = NULL;
 326     EVP_CIPHER_CTX kekctx;
 327     const EVP_CIPHER *kekcipher;
 328     unsigned char *key = NULL;
 329     size_t keylen;
 330
 331     ec = cms->d.envelopedData->encryptedContentInfo;
 332
 333     pwri = ri->d.pwri;
 334     EVP_CIPHER_CTX_init(&kekctx);
 335
 336     if (!pwri->pass) {
 337         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
 338         return 0;
 339     }
 340     algtmp = pwri->keyEncryptionAlgorithm;
 341
 342     if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
 343         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
 344                CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
 345         return 0;
 346     }
 347
 348     if (algtmp->parameter->type == V_ASN1_SEQUENCE) {
 349         p = algtmp->parameter->value.sequence->data;
 350         plen = algtmp->parameter->value.sequence->length;
 351         kekalg = d2i_X509_ALGOR(NULL, &p, plen);
 352     }
 353     if (kekalg == NULL) {
 354         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
 355                CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
 356         return 0;
 357     }
 358
 359     kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
 360
 361     if (!kekcipher) {
 362         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER);
 363         goto err;
 364     }
 365
 366     /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
 367     if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de))
 368         goto err;
 369     EVP_CIPHER_CTX_set_padding(&kekctx, 0);
 370     if (EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) {
 371         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
 372                CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 373         goto err;
 374     }
 375
 376     algtmp = pwri->keyDerivationAlgorithm;
 377
 378     /* Finish password based key derivation to setup key in "ctx" */
 379
 380     if (EVP_PBE_CipherInit(algtmp->algorithm,
 381                            (char *)pwri->pass, pwri->passlen,
 382                            algtmp->parameter, &kekctx, en_de) < 0) {
 383         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
 384         goto err;
 385     }
 386
 387     /* Finally wrap/unwrap the key */
 388
 389     if (en_de) {
 390
 391         if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx))
 392             goto err;
 393
 394         key = OPENSSL_malloc(keylen);
 395
 396         if (!key)
 397             goto err;
 398
 399         if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx))
 400             goto err;
 401         pwri->encryptedKey->data = key;
 402         pwri->encryptedKey->length = keylen;
 403     } else {
 404         key = OPENSSL_malloc(pwri->encryptedKey->length);
 405
 406         if (!key) {
 407             CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);
 408             goto err;
 409         }
 410         if (!kek_unwrap_key(key, &keylen,
 411                             pwri->encryptedKey->data,
 412                             pwri->encryptedKey->length, &kekctx)) {
 413             CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE);
 414             goto err;
 415         }
 416
 417         ec->key = key;
 418         ec->keylen = keylen;
 419
 420     }
 421
 422     r = 1;
 423
 424  err:
 425
 426     EVP_CIPHER_CTX_cleanup(&kekctx);
 427
 428     if (!r && key)
 429         OPENSSL_free(key);
 430     X509_ALGOR_free(kekalg);
 431
 432     return r;
 433
 434 }