| 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 | if (encalg == NULL) { |
| 125 | goto merr; |
| 126 | } |
| 127 | EVP_CIPHER_CTX_init(&ctx); |
| 128 | |
| 129 | if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0) { |
| 130 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB); |
| 131 | goto err; |
| 132 | } |
| 133 | |
| 134 | ivlen = EVP_CIPHER_CTX_iv_length(&ctx); |
| 135 | |
| 136 | if (ivlen > 0) { |
| 137 | if (RAND_pseudo_bytes(iv, ivlen) <= 0) |
| 138 | goto err; |
| 139 | if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0) { |
| 140 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB); |
| 141 | goto err; |
| 142 | } |
| 143 | encalg->parameter = ASN1_TYPE_new(); |
| 144 | if (!encalg->parameter) { |
| 145 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE); |
| 146 | goto err; |
| 147 | } |
| 148 | if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0) { |
| 149 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, |
| 150 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
| 151 | goto err; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx)); |
| 156 | |
| 157 | EVP_CIPHER_CTX_cleanup(&ctx); |
| 158 | |
| 159 | /* Initialize recipient info */ |
| 160 | ri = M_ASN1_new_of(CMS_RecipientInfo); |
| 161 | if (!ri) |
| 162 | goto merr; |
| 163 | |
| 164 | ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo); |
| 165 | if (!ri->d.pwri) |
| 166 | goto merr; |
| 167 | ri->type = CMS_RECIPINFO_PASS; |
| 168 | |
| 169 | pwri = ri->d.pwri; |
| 170 | /* Since this is overwritten, free up empty structure already there */ |
| 171 | X509_ALGOR_free(pwri->keyEncryptionAlgorithm); |
| 172 | pwri->keyEncryptionAlgorithm = X509_ALGOR_new(); |
| 173 | if (!pwri->keyEncryptionAlgorithm) |
| 174 | goto merr; |
| 175 | pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid); |
| 176 | pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new(); |
| 177 | if (!pwri->keyEncryptionAlgorithm->parameter) |
| 178 | goto merr; |
| 179 | |
| 180 | if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR), |
| 181 | &pwri->keyEncryptionAlgorithm->parameter-> |
| 182 | value.sequence)) |
| 183 | goto merr; |
| 184 | pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE; |
| 185 | |
| 186 | X509_ALGOR_free(encalg); |
| 187 | encalg = NULL; |
| 188 | |
| 189 | /* Setup PBE algorithm */ |
| 190 | |
| 191 | pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1); |
| 192 | |
| 193 | if (!pwri->keyDerivationAlgorithm) |
| 194 | goto err; |
| 195 | |
| 196 | CMS_RecipientInfo_set0_password(ri, pass, passlen); |
| 197 | pwri->version = 0; |
| 198 | |
| 199 | if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri)) |
| 200 | goto merr; |
| 201 | |
| 202 | return ri; |
| 203 | |
| 204 | merr: |
| 205 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE); |
| 206 | err: |
| 207 | EVP_CIPHER_CTX_cleanup(&ctx); |
| 208 | if (ri) |
| 209 | M_ASN1_free_of(ri, CMS_RecipientInfo); |
| 210 | if (encalg) |
| 211 | X509_ALGOR_free(encalg); |
| 212 | return NULL; |
| 213 | |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * This is an implementation of the key wrapping mechanism in RFC3211, at |
| 218 | * some point this should go into EVP. |
| 219 | */ |
| 220 | |
| 221 | static int kek_unwrap_key(unsigned char *out, size_t *outlen, |
| 222 | const unsigned char *in, size_t inlen, |
| 223 | EVP_CIPHER_CTX *ctx) |
| 224 | { |
| 225 | size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); |
| 226 | unsigned char *tmp; |
| 227 | int outl, rv = 0; |
| 228 | if (inlen < 2 * blocklen) { |
| 229 | /* too small */ |
| 230 | return 0; |
| 231 | } |
| 232 | if (inlen % blocklen) { |
| 233 | /* Invalid size */ |
| 234 | return 0; |
| 235 | } |
| 236 | tmp = OPENSSL_malloc(inlen); |
| 237 | if (!tmp) |
| 238 | return 0; |
| 239 | /* setup IV by decrypting last two blocks */ |
| 240 | EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl, |
| 241 | in + inlen - 2 * blocklen, blocklen * 2); |
| 242 | /* |
| 243 | * Do a decrypt of last decrypted block to set IV to correct value output |
| 244 | * it to start of buffer so we don't corrupt decrypted block this works |
| 245 | * because buffer is at least two block lengths long. |
| 246 | */ |
| 247 | EVP_DecryptUpdate(ctx, tmp, &outl, tmp + inlen - blocklen, blocklen); |
| 248 | /* Can now decrypt first n - 1 blocks */ |
| 249 | EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen); |
| 250 | |
| 251 | /* Reset IV to original value */ |
| 252 | EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL); |
| 253 | /* Decrypt again */ |
| 254 | EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen); |
| 255 | /* Check check bytes */ |
| 256 | if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) { |
| 257 | /* Check byte failure */ |
| 258 | goto err; |
| 259 | } |
| 260 | if (inlen < (size_t)(tmp[0] - 4)) { |
| 261 | /* Invalid length value */ |
| 262 | goto err; |
| 263 | } |
| 264 | *outlen = (size_t)tmp[0]; |
| 265 | memcpy(out, tmp + 4, *outlen); |
| 266 | rv = 1; |
| 267 | err: |
| 268 | OPENSSL_cleanse(tmp, inlen); |
| 269 | OPENSSL_free(tmp); |
| 270 | return rv; |
| 271 | |
| 272 | } |
| 273 | |
| 274 | static int kek_wrap_key(unsigned char *out, size_t *outlen, |
| 275 | const unsigned char *in, size_t inlen, |
| 276 | EVP_CIPHER_CTX *ctx) |
| 277 | { |
| 278 | size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); |
| 279 | size_t olen; |
| 280 | int dummy; |
| 281 | /* |
| 282 | * First decide length of output buffer: need header and round up to |
| 283 | * multiple of block length. |
| 284 | */ |
| 285 | olen = (inlen + 4 + blocklen - 1) / blocklen; |
| 286 | olen *= blocklen; |
| 287 | if (olen < 2 * blocklen) { |
| 288 | /* Key too small */ |
| 289 | return 0; |
| 290 | } |
| 291 | if (inlen > 0xFF) { |
| 292 | /* Key too large */ |
| 293 | return 0; |
| 294 | } |
| 295 | if (out) { |
| 296 | /* Set header */ |
| 297 | out[0] = (unsigned char)inlen; |
| 298 | out[1] = in[0] ^ 0xFF; |
| 299 | out[2] = in[1] ^ 0xFF; |
| 300 | out[3] = in[2] ^ 0xFF; |
| 301 | memcpy(out + 4, in, inlen); |
| 302 | /* Add random padding to end */ |
| 303 | if (olen > inlen + 4 |
| 304 | && RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen) < 0) |
| 305 | return 0; |
| 306 | /* Encrypt twice */ |
| 307 | EVP_EncryptUpdate(ctx, out, &dummy, out, olen); |
| 308 | EVP_EncryptUpdate(ctx, out, &dummy, out, olen); |
| 309 | } |
| 310 | |
| 311 | *outlen = olen; |
| 312 | |
| 313 | return 1; |
| 314 | } |
| 315 | |
| 316 | /* Encrypt/Decrypt content key in PWRI recipient info */ |
| 317 | |
| 318 | int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, |
| 319 | int en_de) |
| 320 | { |
| 321 | CMS_EncryptedContentInfo *ec; |
| 322 | CMS_PasswordRecipientInfo *pwri; |
| 323 | const unsigned char *p = NULL; |
| 324 | int plen; |
| 325 | int r = 0; |
| 326 | X509_ALGOR *algtmp, *kekalg = NULL; |
| 327 | EVP_CIPHER_CTX kekctx; |
| 328 | const EVP_CIPHER *kekcipher; |
| 329 | unsigned char *key = NULL; |
| 330 | size_t keylen; |
| 331 | |
| 332 | ec = cms->d.envelopedData->encryptedContentInfo; |
| 333 | |
| 334 | pwri = ri->d.pwri; |
| 335 | EVP_CIPHER_CTX_init(&kekctx); |
| 336 | |
| 337 | if (!pwri->pass) { |
| 338 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD); |
| 339 | return 0; |
| 340 | } |
| 341 | algtmp = pwri->keyEncryptionAlgorithm; |
| 342 | |
| 343 | if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) { |
| 344 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, |
| 345 | CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM); |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | if (algtmp->parameter->type == V_ASN1_SEQUENCE) { |
| 350 | p = algtmp->parameter->value.sequence->data; |
| 351 | plen = algtmp->parameter->value.sequence->length; |
| 352 | kekalg = d2i_X509_ALGOR(NULL, &p, plen); |
| 353 | } |
| 354 | if (kekalg == NULL) { |
| 355 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, |
| 356 | CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER); |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); |
| 361 | |
| 362 | if (!kekcipher) { |
| 363 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER); |
| 364 | goto err; |
| 365 | } |
| 366 | |
| 367 | /* Fixup cipher based on AlgorithmIdentifier to set IV etc */ |
| 368 | if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de)) |
| 369 | goto err; |
| 370 | EVP_CIPHER_CTX_set_padding(&kekctx, 0); |
| 371 | if (EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) { |
| 372 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, |
| 373 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
| 374 | goto err; |
| 375 | } |
| 376 | |
| 377 | algtmp = pwri->keyDerivationAlgorithm; |
| 378 | |
| 379 | /* Finish password based key derivation to setup key in "ctx" */ |
| 380 | |
| 381 | if (EVP_PBE_CipherInit(algtmp->algorithm, |
| 382 | (char *)pwri->pass, pwri->passlen, |
| 383 | algtmp->parameter, &kekctx, en_de) < 0) { |
| 384 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB); |
| 385 | goto err; |
| 386 | } |
| 387 | |
| 388 | /* Finally wrap/unwrap the key */ |
| 389 | |
| 390 | if (en_de) { |
| 391 | |
| 392 | if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx)) |
| 393 | goto err; |
| 394 | |
| 395 | key = OPENSSL_malloc(keylen); |
| 396 | |
| 397 | if (!key) |
| 398 | goto err; |
| 399 | |
| 400 | if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx)) |
| 401 | goto err; |
| 402 | pwri->encryptedKey->data = key; |
| 403 | pwri->encryptedKey->length = keylen; |
| 404 | } else { |
| 405 | key = OPENSSL_malloc(pwri->encryptedKey->length); |
| 406 | |
| 407 | if (!key) { |
| 408 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE); |
| 409 | goto err; |
| 410 | } |
| 411 | if (!kek_unwrap_key(key, &keylen, |
| 412 | pwri->encryptedKey->data, |
| 413 | pwri->encryptedKey->length, &kekctx)) { |
| 414 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE); |
| 415 | goto err; |
| 416 | } |
| 417 | |
| 418 | ec->key = key; |
| 419 | ec->keylen = keylen; |
| 420 | |
| 421 | } |
| 422 | |
| 423 | r = 1; |
| 424 | |
| 425 | err: |
| 426 | |
| 427 | EVP_CIPHER_CTX_cleanup(&kekctx); |
| 428 | |
| 429 | if (!r && key) |
| 430 | OPENSSL_free(key); |
| 431 | X509_ALGOR_free(kekalg); |
| 432 | |
| 433 | return r; |
| 434 | |
| 435 | } |