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0f113f3e MC |
1 | /* |
2 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
d2a53c22 DSH |
3 | * project. |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2009 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
d2a53c22 DSH |
14 | * |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | */ | |
53 | ||
b39fc560 | 54 | #include "internal/cryptlib.h" |
d2a53c22 DSH |
55 | #include <openssl/asn1t.h> |
56 | #include <openssl/pem.h> | |
57 | #include <openssl/x509v3.h> | |
58 | #include <openssl/err.h> | |
59 | #include <openssl/cms.h> | |
60 | #include <openssl/rand.h> | |
61 | #include <openssl/aes.h> | |
62 | #include "cms_lcl.h" | |
5fe736e5 | 63 | #include "internal/asn1_int.h" |
d2a53c22 | 64 | |
0f113f3e MC |
65 | int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri, |
66 | unsigned char *pass, ossl_ssize_t passlen) | |
67 | { | |
68 | CMS_PasswordRecipientInfo *pwri; | |
69 | if (ri->type != CMS_RECIPINFO_PASS) { | |
70 | CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | pwri = ri->d.pwri; | |
75 | pwri->pass = pass; | |
76 | if (pass && passlen < 0) | |
77 | passlen = strlen((char *)pass); | |
78 | pwri->passlen = passlen; | |
79 | return 1; | |
80 | } | |
d2a53c22 DSH |
81 | |
82 | CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms, | |
0f113f3e MC |
83 | int iter, int wrap_nid, |
84 | int pbe_nid, | |
85 | unsigned char *pass, | |
86 | ossl_ssize_t passlen, | |
87 | const EVP_CIPHER *kekciph) | |
88 | { | |
89 | CMS_RecipientInfo *ri = NULL; | |
90 | CMS_EnvelopedData *env; | |
91 | CMS_PasswordRecipientInfo *pwri; | |
846ec07d | 92 | EVP_CIPHER_CTX *ctx = NULL; |
0f113f3e MC |
93 | X509_ALGOR *encalg = NULL; |
94 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
95 | int ivlen; | |
96 | ||
97 | env = cms_get0_enveloped(cms); | |
98 | if (!env) | |
99 | return NULL; | |
100 | ||
101 | if (wrap_nid <= 0) | |
102 | wrap_nid = NID_id_alg_PWRI_KEK; | |
103 | ||
104 | if (pbe_nid <= 0) | |
105 | pbe_nid = NID_id_pbkdf2; | |
106 | ||
107 | /* Get from enveloped data */ | |
108 | if (kekciph == NULL) | |
109 | kekciph = env->encryptedContentInfo->cipher; | |
110 | ||
111 | if (kekciph == NULL) { | |
112 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER); | |
113 | return NULL; | |
114 | } | |
115 | if (wrap_nid != NID_id_alg_PWRI_KEK) { | |
116 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, | |
117 | CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM); | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | /* Setup algorithm identifier for cipher */ | |
122 | encalg = X509_ALGOR_new(); | |
90945fa3 MC |
123 | if (encalg == NULL) { |
124 | goto merr; | |
125 | } | |
846ec07d | 126 | ctx = EVP_CIPHER_CTX_new(); |
0f113f3e | 127 | |
846ec07d | 128 | if (EVP_EncryptInit_ex(ctx, kekciph, NULL, NULL, NULL) <= 0) { |
0f113f3e MC |
129 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB); |
130 | goto err; | |
131 | } | |
132 | ||
846ec07d | 133 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); |
0f113f3e MC |
134 | |
135 | if (ivlen > 0) { | |
266483d2 | 136 | if (RAND_bytes(iv, ivlen) <= 0) |
0f113f3e | 137 | goto err; |
846ec07d | 138 | if (EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv) <= 0) { |
0f113f3e MC |
139 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB); |
140 | goto err; | |
141 | } | |
142 | encalg->parameter = ASN1_TYPE_new(); | |
143 | if (!encalg->parameter) { | |
144 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE); | |
145 | goto err; | |
146 | } | |
846ec07d | 147 | if (EVP_CIPHER_param_to_asn1(ctx, encalg->parameter) <= 0) { |
0f113f3e MC |
148 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, |
149 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
150 | goto err; | |
151 | } | |
152 | } | |
153 | ||
846ec07d | 154 | encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); |
0f113f3e | 155 | |
846ec07d RL |
156 | EVP_CIPHER_CTX_free(ctx); |
157 | ctx = NULL; | |
0f113f3e MC |
158 | |
159 | /* Initialize recipient info */ | |
160 | ri = M_ASN1_new_of(CMS_RecipientInfo); | |
90945fa3 | 161 | if (ri == NULL) |
0f113f3e MC |
162 | goto merr; |
163 | ||
164 | ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo); | |
90945fa3 | 165 | if (ri->d.pwri == NULL) |
0f113f3e MC |
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(); | |
90945fa3 | 173 | if (pwri->keyEncryptionAlgorithm == NULL) |
0f113f3e MC |
174 | goto merr; |
175 | pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid); | |
176 | pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new(); | |
90945fa3 | 177 | if (pwri->keyEncryptionAlgorithm->parameter == NULL) |
0f113f3e MC |
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: | |
846ec07d | 207 | EVP_CIPHER_CTX_free(ctx); |
0f113f3e MC |
208 | if (ri) |
209 | M_ASN1_free_of(ri, CMS_RecipientInfo); | |
222561fe | 210 | X509_ALGOR_free(encalg); |
0f113f3e MC |
211 | return NULL; |
212 | ||
213 | } | |
214 | ||
215 | /* | |
216 | * This is an implementation of the key wrapping mechanism in RFC3211, at | |
217 | * some point this should go into EVP. | |
d2a53c22 DSH |
218 | */ |
219 | ||
220 | static int kek_unwrap_key(unsigned char *out, size_t *outlen, | |
0f113f3e MC |
221 | const unsigned char *in, size_t inlen, |
222 | EVP_CIPHER_CTX *ctx) | |
223 | { | |
224 | size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); | |
225 | unsigned char *tmp; | |
226 | int outl, rv = 0; | |
227 | if (inlen < 2 * blocklen) { | |
228 | /* too small */ | |
229 | return 0; | |
230 | } | |
231 | if (inlen % blocklen) { | |
232 | /* Invalid size */ | |
233 | return 0; | |
234 | } | |
235 | tmp = OPENSSL_malloc(inlen); | |
90945fa3 | 236 | if (tmp == NULL) |
918bb865 | 237 | return 0; |
0f113f3e MC |
238 | /* setup IV by decrypting last two blocks */ |
239 | if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl, | |
240 | in + inlen - 2 * blocklen, blocklen * 2) | |
241 | /* | |
242 | * Do a decrypt of last decrypted block to set IV to correct value | |
243 | * output it to start of buffer so we don't corrupt decrypted block | |
244 | * this works because buffer is at least two block lengths long. | |
245 | */ | |
246 | || !EVP_DecryptUpdate(ctx, tmp, &outl, | |
247 | 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 | goto err; | |
256 | /* Check check bytes */ | |
257 | if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) { | |
258 | /* Check byte failure */ | |
259 | goto err; | |
260 | } | |
261 | if (inlen < (size_t)(tmp[0] - 4)) { | |
262 | /* Invalid length value */ | |
263 | goto err; | |
264 | } | |
265 | *outlen = (size_t)tmp[0]; | |
266 | memcpy(out, tmp + 4, *outlen); | |
267 | rv = 1; | |
268 | err: | |
4b45c6e5 | 269 | OPENSSL_clear_free(tmp, inlen); |
0f113f3e MC |
270 | return rv; |
271 | ||
272 | } | |
d2a53c22 DSH |
273 | |
274 | static int kek_wrap_key(unsigned char *out, size_t *outlen, | |
0f113f3e MC |
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 */ | |
266483d2 MC |
303 | if (olen > inlen + 4 |
304 | && RAND_bytes(out + 4 + inlen, olen - 4 - inlen) <= 0) | |
305 | return 0; | |
0f113f3e MC |
306 | /* Encrypt twice */ |
307 | if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen) | |
308 | || !EVP_EncryptUpdate(ctx, out, &dummy, out, olen)) | |
309 | return 0; | |
310 | } | |
311 | ||
312 | *outlen = olen; | |
313 | ||
314 | return 1; | |
315 | } | |
d2a53c22 DSH |
316 | |
317 | /* Encrypt/Decrypt content key in PWRI recipient info */ | |
318 | ||
319 | int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, | |
0f113f3e MC |
320 | int en_de) |
321 | { | |
322 | CMS_EncryptedContentInfo *ec; | |
323 | CMS_PasswordRecipientInfo *pwri; | |
0f113f3e MC |
324 | int r = 0; |
325 | X509_ALGOR *algtmp, *kekalg = NULL; | |
846ec07d | 326 | EVP_CIPHER_CTX *kekctx; |
0f113f3e MC |
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; | |
846ec07d | 334 | kekctx = EVP_CIPHER_CTX_new(); |
0f113f3e MC |
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 | ||
e93c8748 DSH |
348 | kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR), |
349 | algtmp->parameter); | |
350 | ||
0f113f3e MC |
351 | if (kekalg == NULL) { |
352 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, | |
353 | CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); | |
358 | ||
359 | if (!kekcipher) { | |
360 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER); | |
361 | goto err; | |
362 | } | |
363 | ||
364 | /* Fixup cipher based on AlgorithmIdentifier to set IV etc */ | |
846ec07d | 365 | if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL, NULL, NULL, en_de)) |
0f113f3e | 366 | goto err; |
846ec07d RL |
367 | EVP_CIPHER_CTX_set_padding(kekctx, 0); |
368 | if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) < 0) { | |
0f113f3e MC |
369 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, |
370 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
371 | goto err; | |
372 | } | |
373 | ||
374 | algtmp = pwri->keyDerivationAlgorithm; | |
375 | ||
376 | /* Finish password based key derivation to setup key in "ctx" */ | |
377 | ||
378 | if (EVP_PBE_CipherInit(algtmp->algorithm, | |
379 | (char *)pwri->pass, pwri->passlen, | |
846ec07d | 380 | algtmp->parameter, kekctx, en_de) < 0) { |
0f113f3e MC |
381 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB); |
382 | goto err; | |
383 | } | |
384 | ||
385 | /* Finally wrap/unwrap the key */ | |
386 | ||
387 | if (en_de) { | |
388 | ||
846ec07d | 389 | if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, kekctx)) |
0f113f3e MC |
390 | goto err; |
391 | ||
392 | key = OPENSSL_malloc(keylen); | |
393 | ||
90945fa3 | 394 | if (key == NULL) |
0f113f3e MC |
395 | goto err; |
396 | ||
846ec07d | 397 | if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx)) |
0f113f3e MC |
398 | goto err; |
399 | pwri->encryptedKey->data = key; | |
400 | pwri->encryptedKey->length = keylen; | |
401 | } else { | |
402 | key = OPENSSL_malloc(pwri->encryptedKey->length); | |
403 | ||
90945fa3 | 404 | if (key == NULL) { |
0f113f3e MC |
405 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE); |
406 | goto err; | |
407 | } | |
408 | if (!kek_unwrap_key(key, &keylen, | |
409 | pwri->encryptedKey->data, | |
846ec07d | 410 | pwri->encryptedKey->length, kekctx)) { |
0f113f3e MC |
411 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE); |
412 | goto err; | |
413 | } | |
414 | ||
415 | ec->key = key; | |
416 | ec->keylen = keylen; | |
417 | ||
418 | } | |
419 | ||
420 | r = 1; | |
421 | ||
422 | err: | |
423 | ||
846ec07d | 424 | EVP_CIPHER_CTX_free(kekctx); |
0f113f3e | 425 | |
b548a1f1 | 426 | if (!r) |
0f113f3e MC |
427 | OPENSSL_free(key); |
428 | X509_ALGOR_free(kekalg); | |
429 | ||
430 | return r; | |
431 | ||
432 | } |