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dc100d87 | 1 | /* crypto/cms/cms_pwri.c */ |
ae5c8664 MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
dc100d87 DSH |
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 | |
ae5c8664 | 14 | * notice, this list of conditions and the following disclaimer. |
dc100d87 DSH |
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 | ||
ae5c8664 MC |
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 | } | |
dc100d87 DSH |
82 | |
83 | CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms, | |
ae5c8664 MC |
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. | |
dc100d87 DSH |
216 | */ |
217 | ||
218 | static int kek_unwrap_key(unsigned char *out, size_t *outlen, | |
ae5c8664 MC |
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); | |
3b38646d | 234 | if (!tmp) |
d6b4a41d | 235 | return 0; |
ae5c8664 MC |
236 | /* setup IV by decrypting last two blocks */ |
237 | 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 output | |
241 | * it to start of buffer so we don't corrupt decrypted block this works | |
242 | * because buffer is at least two block lengths long. | |
243 | */ | |
244 | EVP_DecryptUpdate(ctx, tmp, &outl, tmp + inlen - blocklen, blocklen); | |
245 | /* Can now decrypt first n - 1 blocks */ | |
246 | EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen); | |
247 | ||
248 | /* Reset IV to original value */ | |
249 | EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL); | |
250 | /* Decrypt again */ | |
251 | EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen); | |
252 | /* Check check bytes */ | |
253 | if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) { | |
254 | /* Check byte failure */ | |
255 | goto err; | |
256 | } | |
257 | if (inlen < (size_t)(tmp[0] - 4)) { | |
258 | /* Invalid length value */ | |
259 | goto err; | |
260 | } | |
261 | *outlen = (size_t)tmp[0]; | |
262 | memcpy(out, tmp + 4, *outlen); | |
263 | rv = 1; | |
264 | err: | |
265 | OPENSSL_cleanse(tmp, inlen); | |
266 | OPENSSL_free(tmp); | |
267 | return rv; | |
268 | ||
269 | } | |
dc100d87 DSH |
270 | |
271 | static int kek_wrap_key(unsigned char *out, size_t *outlen, | |
ae5c8664 MC |
272 | const unsigned char *in, size_t inlen, |
273 | EVP_CIPHER_CTX *ctx) | |
274 | { | |
275 | size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); | |
276 | size_t olen; | |
277 | int dummy; | |
278 | /* | |
279 | * First decide length of output buffer: need header and round up to | |
280 | * multiple of block length. | |
281 | */ | |
282 | olen = (inlen + 4 + blocklen - 1) / blocklen; | |
283 | olen *= blocklen; | |
284 | if (olen < 2 * blocklen) { | |
285 | /* Key too small */ | |
286 | return 0; | |
287 | } | |
288 | if (inlen > 0xFF) { | |
289 | /* Key too large */ | |
290 | return 0; | |
291 | } | |
292 | if (out) { | |
293 | /* Set header */ | |
294 | out[0] = (unsigned char)inlen; | |
295 | out[1] = in[0] ^ 0xFF; | |
296 | out[2] = in[1] ^ 0xFF; | |
297 | out[3] = in[2] ^ 0xFF; | |
298 | memcpy(out + 4, in, inlen); | |
299 | /* Add random padding to end */ | |
8f8e4e4f MC |
300 | if (olen > inlen + 4 |
301 | && RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen) < 0) | |
302 | return 0; | |
ae5c8664 MC |
303 | /* Encrypt twice */ |
304 | EVP_EncryptUpdate(ctx, out, &dummy, out, olen); | |
305 | EVP_EncryptUpdate(ctx, out, &dummy, out, olen); | |
306 | } | |
307 | ||
308 | *outlen = olen; | |
309 | ||
310 | return 1; | |
311 | } | |
dc100d87 DSH |
312 | |
313 | /* Encrypt/Decrypt content key in PWRI recipient info */ | |
314 | ||
315 | int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, | |
ae5c8664 MC |
316 | int en_de) |
317 | { | |
318 | CMS_EncryptedContentInfo *ec; | |
319 | CMS_PasswordRecipientInfo *pwri; | |
320 | const unsigned char *p = NULL; | |
321 | int plen; | |
322 | int r = 0; | |
323 | X509_ALGOR *algtmp, *kekalg = NULL; | |
324 | EVP_CIPHER_CTX kekctx; | |
325 | const EVP_CIPHER *kekcipher; | |
326 | unsigned char *key = NULL; | |
327 | size_t keylen; | |
328 | ||
329 | ec = cms->d.envelopedData->encryptedContentInfo; | |
330 | ||
331 | pwri = ri->d.pwri; | |
332 | EVP_CIPHER_CTX_init(&kekctx); | |
333 | ||
334 | if (!pwri->pass) { | |
335 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD); | |
336 | return 0; | |
337 | } | |
338 | algtmp = pwri->keyEncryptionAlgorithm; | |
339 | ||
340 | if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) { | |
341 | CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, | |
342 | CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | if (algtmp->parameter->type == V_ASN1_SEQUENCE) { | |
347 | p = algtmp->parameter->value.sequence->data; | |
348 | plen = algtmp->parameter->value.sequence->length; | |
349 | kekalg = d2i_X509_ALGOR(NULL, &p, plen); | |
350 | } | |
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 */ | |
365 | if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de)) | |
366 | goto err; | |
367 | EVP_CIPHER_CTX_set_padding(&kekctx, 0); | |
368 | if (EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0) { | |
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, | |
380 | algtmp->parameter, &kekctx, en_de) < 0) { | |
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 | ||
389 | if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx)) | |
390 | goto err; | |
391 | ||
392 | key = OPENSSL_malloc(keylen); | |
393 | ||
394 | if (!key) | |
395 | goto err; | |
396 | ||
397 | if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx)) | |
398 | goto err; | |
399 | pwri->encryptedKey->data = key; | |
400 | pwri->encryptedKey->length = keylen; | |
401 | } else { | |
402 | key = OPENSSL_malloc(pwri->encryptedKey->length); | |
403 | ||
404 | if (!key) { | |
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, | |
410 | pwri->encryptedKey->length, &kekctx)) { | |
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 | ||
424 | EVP_CIPHER_CTX_cleanup(&kekctx); | |
425 | ||
426 | if (!r && key) | |
427 | OPENSSL_free(key); | |
428 | X509_ALGOR_free(kekalg); | |
429 | ||
430 | return r; | |
431 | ||
432 | } |