1 /* crypto/cms/cms_pwri.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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
13 * notice, this list of conditions and the following disclaimer.
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
54 #include "cryptlib.h"
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"
63 #include "asn1_locl.h"
64
CMS_RecipientInfo_set0_password(CMS_RecipientInfo * ri,unsigned char * pass,ossl_ssize_t passlen)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 {
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
CMS_add0_recipient_password(CMS_ContentInfo * cms,int iter,int wrap_nid,int pbe_nid,unsigned char * pass,ossl_ssize_t passlen,const EVP_CIPHER * kekciph)83 CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms,
84 int iter, int wrap_nid, 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;
92 EVP_CIPHER_CTX ctx;
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 {
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 {
118 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
119 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
120 return NULL;
121 }
122
123 /* Setup algorithm identifier for cipher */
124 encalg = X509_ALGOR_new();
125 EVP_CIPHER_CTX_init(&ctx);
126
127 if (EVP_EncryptInit_ex(&ctx, kekciph, NULL, NULL, NULL) <= 0)
128 {
129 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
130 goto err;
131 }
132
133 ivlen = EVP_CIPHER_CTX_iv_length(&ctx);
134
135 if (ivlen > 0)
136 {
137 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
138 goto err;
139 if (EVP_EncryptInit_ex(&ctx, NULL, NULL, NULL, iv) <= 0)
140 {
141 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
142 ERR_R_EVP_LIB);
143 goto err;
144 }
145 encalg->parameter = ASN1_TYPE_new();
146 if (!encalg->parameter)
147 {
148 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
149 ERR_R_MALLOC_FAILURE);
150 goto err;
151 }
152 if (EVP_CIPHER_param_to_asn1(&ctx, encalg->parameter) <= 0)
153 {
154 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
155 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
156 goto err;
157 }
158 }
159
160
161 encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(&ctx));
162
163 EVP_CIPHER_CTX_cleanup(&ctx);
164
165 /* Initialize recipient info */
166 ri = M_ASN1_new_of(CMS_RecipientInfo);
167 if (!ri)
168 goto merr;
169
170 ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
171 if (!ri->d.pwri)
172 goto merr;
173 ri->type = CMS_RECIPINFO_PASS;
174
175 pwri = ri->d.pwri;
176 /* Since this is overwritten, free up empty structure already there */
177 X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
178 pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
179 if (!pwri->keyEncryptionAlgorithm)
180 goto merr;
181 pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
182 pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
183 if (!pwri->keyEncryptionAlgorithm->parameter)
184 goto merr;
185
186 if(!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
187 &pwri->keyEncryptionAlgorithm->parameter->value.sequence))
188 goto merr;
189 pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
190
191 X509_ALGOR_free(encalg);
192 encalg = NULL;
193
194 /* Setup PBE algorithm */
195
196 pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
197
198 if (!pwri->keyDerivationAlgorithm)
199 goto err;
200
201 CMS_RecipientInfo_set0_password(ri, pass, passlen);
202 pwri->version = 0;
203
204 if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
205 goto merr;
206
207 return ri;
208
209 merr:
210 CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
211 err:
212 EVP_CIPHER_CTX_cleanup(&ctx);
213 if (ri)
214 M_ASN1_free_of(ri, CMS_RecipientInfo);
215 if (encalg)
216 X509_ALGOR_free(encalg);
217 return NULL;
218
219 }
220
221 /* This is an implementation of the key wrapping mechanism in RFC3211,
222 * at some point this should go into EVP.
223 */
224
kek_unwrap_key(unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen,EVP_CIPHER_CTX * ctx)225 static int kek_unwrap_key(unsigned char *out, size_t *outlen,
226 const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx)
227 {
228 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
229 unsigned char *tmp;
230 int outl, rv = 0;
231 if (inlen < 2 * blocklen)
232 {
233 /* too small */
234 return 0;
235 }
236 if (inlen % blocklen)
237 {
238 /* Invalid size */
239 return 0;
240 }
241 tmp = OPENSSL_malloc(inlen);
242 /* setup IV by decrypting last two blocks */
243 EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
244 in + inlen - 2 * blocklen, blocklen * 2);
245 /* Do a decrypt of last decrypted block to set IV to correct value
246 * output it to start of buffer so we don't corrupt decrypted block
247 * this works because buffer is at least two block lengths long.
248 */
249 EVP_DecryptUpdate(ctx, tmp, &outl,
250 tmp + inlen - blocklen, blocklen);
251 /* Can now decrypt first n - 1 blocks */
252 EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen);
253
254 /* Reset IV to original value */
255 EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
256 /* Decrypt again */
257 EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen);
258 /* Check check bytes */
259 if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff)
260 {
261 /* Check byte failure */
262 goto err;
263 }
264 if (inlen < (size_t)(tmp[0] - 4 ))
265 {
266 /* Invalid length value */
267 goto err;
268 }
269 *outlen = (size_t)tmp[0];
270 memcpy(out, tmp + 4, *outlen);
271 rv = 1;
272 err:
273 OPENSSL_cleanse(tmp, inlen);
274 OPENSSL_free(tmp);
275 return rv;
276
277 }
278
kek_wrap_key(unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen,EVP_CIPHER_CTX * ctx)279 static int kek_wrap_key(unsigned char *out, size_t *outlen,
280 const unsigned char *in, size_t inlen, EVP_CIPHER_CTX *ctx)
281 {
282 size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
283 size_t olen;
284 int dummy;
285 /* First decide length of output buffer: need header and round up to
286 * multiple of block length.
287 */
288 olen = (inlen + 4 + blocklen - 1)/blocklen;
289 olen *= blocklen;
290 if (olen < 2 * blocklen)
291 {
292 /* Key too small */
293 return 0;
294 }
295 if (inlen > 0xFF)
296 {
297 /* Key too large */
298 return 0;
299 }
300 if (out)
301 {
302 /* Set header */
303 out[0] = (unsigned char)inlen;
304 out[1] = in[0] ^ 0xFF;
305 out[2] = in[1] ^ 0xFF;
306 out[3] = in[2] ^ 0xFF;
307 memcpy(out + 4, in, inlen);
308 /* Add random padding to end */
309 if (olen > inlen + 4)
310 RAND_pseudo_bytes(out + 4 + inlen, olen - 4 - inlen);
311 /* Encrypt twice */
312 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
313 EVP_EncryptUpdate(ctx, out, &dummy, out, olen);
314 }
315
316 *outlen = olen;
317
318 return 1;
319 }
320
321 /* Encrypt/Decrypt content key in PWRI recipient info */
322
cms_RecipientInfo_pwri_crypt(CMS_ContentInfo * cms,CMS_RecipientInfo * ri,int en_de)323 int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
324 int en_de)
325 {
326 CMS_EncryptedContentInfo *ec;
327 CMS_PasswordRecipientInfo *pwri;
328 const unsigned char *p = NULL;
329 int plen;
330 int r = 0;
331 X509_ALGOR *algtmp, *kekalg = NULL;
332 EVP_CIPHER_CTX kekctx;
333 const EVP_CIPHER *kekcipher;
334 unsigned char *key = NULL;
335 size_t keylen;
336
337 ec = cms->d.envelopedData->encryptedContentInfo;
338
339 pwri = ri->d.pwri;
340 EVP_CIPHER_CTX_init(&kekctx);
341
342 if (!pwri->pass)
343 {
344 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
345 return 0;
346 }
347 algtmp = pwri->keyEncryptionAlgorithm;
348
349 if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK)
350 {
351 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
352 CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
353 return 0;
354 }
355
356 if (algtmp->parameter->type == V_ASN1_SEQUENCE)
357 {
358 p = algtmp->parameter->value.sequence->data;
359 plen = algtmp->parameter->value.sequence->length;
360 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
361 }
362 if (kekalg == NULL)
363 {
364 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
365 CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
366 return 0;
367 }
368
369 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
370
371 if(!kekcipher)
372 {
373 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
374 CMS_R_UNKNOWN_CIPHER);
375 goto err;
376 }
377
378 /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
379 if (!EVP_CipherInit_ex(&kekctx, kekcipher, NULL, NULL, NULL, en_de))
380 goto err;
381 EVP_CIPHER_CTX_set_padding(&kekctx, 0);
382 if(EVP_CIPHER_asn1_to_param(&kekctx, kekalg->parameter) < 0)
383 {
384 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
385 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
386 goto err;
387 }
388
389 algtmp = pwri->keyDerivationAlgorithm;
390
391 /* Finish password based key derivation to setup key in "ctx" */
392
393 if (EVP_PBE_CipherInit(algtmp->algorithm,
394 (char *)pwri->pass, pwri->passlen,
395 algtmp->parameter, &kekctx, en_de) < 0)
396 {
397 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
398 goto err;
399 }
400
401 /* Finally wrap/unwrap the key */
402
403 if (en_de)
404 {
405
406 if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, &kekctx))
407 goto err;
408
409 key = OPENSSL_malloc(keylen);
410
411 if (!key)
412 goto err;
413
414 if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, &kekctx))
415 goto err;
416 pwri->encryptedKey->data = key;
417 pwri->encryptedKey->length = keylen;
418 }
419 else
420 {
421 key = OPENSSL_malloc(pwri->encryptedKey->length);
422
423 if (!key)
424 {
425 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
426 ERR_R_MALLOC_FAILURE);
427 goto err;
428 }
429 if (!kek_unwrap_key(key, &keylen,
430 pwri->encryptedKey->data,
431 pwri->encryptedKey->length, &kekctx))
432 {
433 CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
434 CMS_R_UNWRAP_FAILURE);
435 goto err;
436 }
437
438 ec->key = key;
439 ec->keylen = keylen;
440
441 }
442
443 r = 1;
444
445 err:
446
447 EVP_CIPHER_CTX_cleanup(&kekctx);
448
449 if (!r && key)
450 OPENSSL_free(key);
451 X509_ALGOR_free(kekalg);
452
453 return r;
454
455 }
456