File: | src/lib/libcrypto/cms/cms_pwri.c |
Warning: | line 109, column 3 Value stored to 'pbe_nid' is never read |
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1 | /* $OpenBSD: cms_pwri.c,v 1.26 2019/08/12 18:04:57 jsing Exp $ */ |
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 <string.h> |
56 | |
57 | #include "cryptlib.h" |
58 | #include <openssl/asn1t.h> |
59 | #include <openssl/pem.h> |
60 | #include <openssl/x509v3.h> |
61 | #include <openssl/err.h> |
62 | #include <openssl/cms.h> |
63 | #include <openssl/rand.h> |
64 | #include <openssl/aes.h> |
65 | #include "cms_lcl.h" |
66 | #include "asn1/asn1_locl.h" |
67 | |
68 | int |
69 | CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri, unsigned char *pass, |
70 | ssize_t passlen) |
71 | { |
72 | CMS_PasswordRecipientInfo *pwri; |
73 | |
74 | if (ri->type != CMS_RECIPINFO_PASS3) { |
75 | CMSerror(CMS_R_NOT_PWRI)ERR_put_error(46,(0xfff),(177),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,75); |
76 | return 0; |
77 | } |
78 | |
79 | pwri = ri->d.pwri; |
80 | pwri->pass = pass; |
81 | if (pass && passlen < 0) |
82 | passlen = strlen((char *)pass); |
83 | pwri->passlen = passlen; |
84 | |
85 | return 1; |
86 | } |
87 | |
88 | CMS_RecipientInfo * |
89 | CMS_add0_recipient_password(CMS_ContentInfo *cms, int iter, int wrap_nid, |
90 | int pbe_nid, unsigned char *pass, ssize_t passlen, |
91 | const EVP_CIPHER *kekciph) |
92 | { |
93 | CMS_RecipientInfo *ri = NULL((void*)0); |
94 | CMS_EnvelopedData *env; |
95 | CMS_PasswordRecipientInfo *pwri; |
96 | EVP_CIPHER_CTX *ctx = NULL((void*)0); |
97 | X509_ALGOR *encalg = NULL((void*)0); |
98 | unsigned char iv[EVP_MAX_IV_LENGTH16]; |
99 | int ivlen; |
100 | |
101 | env = cms_get0_enveloped(cms); |
102 | if (!env) |
103 | return NULL((void*)0); |
104 | |
105 | if (wrap_nid <= 0) |
106 | wrap_nid = NID_id_alg_PWRI_KEK893; |
107 | |
108 | if (pbe_nid <= 0) |
109 | pbe_nid = NID_id_pbkdf269; |
Value stored to 'pbe_nid' is never read | |
110 | |
111 | /* Get from enveloped data */ |
112 | if (kekciph == NULL((void*)0)) |
113 | kekciph = env->encryptedContentInfo->cipher; |
114 | |
115 | if (kekciph == NULL((void*)0)) { |
116 | CMSerror(CMS_R_NO_CIPHER)ERR_put_error(46,(0xfff),(126),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,116); |
117 | return NULL((void*)0); |
118 | } |
119 | if (wrap_nid != NID_id_alg_PWRI_KEK893) { |
120 | CMSerror(CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM)ERR_put_error(46,(0xfff),(179),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,120); |
121 | return NULL((void*)0); |
122 | } |
123 | |
124 | /* Setup algorithm identifier for cipher */ |
125 | encalg = X509_ALGOR_new(); |
126 | if (encalg == NULL((void*)0)) { |
127 | goto merr; |
128 | } |
129 | ctx = EVP_CIPHER_CTX_new(); |
130 | |
131 | if (EVP_EncryptInit_ex(ctx, kekciph, NULL((void*)0), NULL((void*)0), NULL((void*)0)) <= 0) { |
132 | CMSerror(ERR_R_EVP_LIB)ERR_put_error(46,(0xfff),(6),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,132); |
133 | goto err; |
134 | } |
135 | |
136 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); |
137 | |
138 | if (ivlen > 0) { |
139 | arc4random_buf(iv, ivlen); |
140 | if (EVP_EncryptInit_ex(ctx, NULL((void*)0), NULL((void*)0), NULL((void*)0), iv) <= 0) { |
141 | CMSerror(ERR_R_EVP_LIB)ERR_put_error(46,(0xfff),(6),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,141); |
142 | goto err; |
143 | } |
144 | encalg->parameter = ASN1_TYPE_new(); |
145 | if (!encalg->parameter) { |
146 | CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,146); |
147 | goto err; |
148 | } |
149 | if (EVP_CIPHER_param_to_asn1(ctx, encalg->parameter) <= 0) { |
150 | CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR)ERR_put_error(46,(0xfff),(102),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,150); |
151 | goto err; |
152 | } |
153 | } |
154 | |
155 | encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(ctx))); |
156 | |
157 | EVP_CIPHER_CTX_free(ctx); |
158 | ctx = NULL((void*)0); |
159 | |
160 | /* Initialize recipient info */ |
161 | ri = (CMS_RecipientInfo *)ASN1_item_new(&CMS_RecipientInfo_it); |
162 | if (ri == NULL((void*)0)) |
163 | goto merr; |
164 | |
165 | ri->d.pwri = (CMS_PasswordRecipientInfo *)ASN1_item_new(&CMS_PasswordRecipientInfo_it); |
166 | if (ri->d.pwri == NULL((void*)0)) |
167 | goto merr; |
168 | ri->type = CMS_RECIPINFO_PASS3; |
169 | |
170 | pwri = ri->d.pwri; |
171 | /* Since this is overwritten, free up empty structure already there */ |
172 | X509_ALGOR_free(pwri->keyEncryptionAlgorithm); |
173 | pwri->keyEncryptionAlgorithm = X509_ALGOR_new(); |
174 | if (pwri->keyEncryptionAlgorithm == NULL((void*)0)) |
175 | goto merr; |
176 | pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid); |
177 | pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new(); |
178 | if (pwri->keyEncryptionAlgorithm->parameter == NULL((void*)0)) |
179 | goto merr; |
180 | |
181 | if (!ASN1_item_pack(encalg, &X509_ALGOR_it, |
182 | &pwri->keyEncryptionAlgorithm->parameter->value.sequence)) |
183 | goto merr; |
184 | pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE16; |
185 | |
186 | X509_ALGOR_free(encalg); |
187 | encalg = NULL((void*)0); |
188 | |
189 | /* Setup PBE algorithm */ |
190 | |
191 | pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL((void*)0), 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)sk_push(((_STACK*) (1 ? (env->recipientInfos) : (struct stack_st_CMS_RecipientInfo *)0)), ((void*) (1 ? (ri) : (CMS_RecipientInfo*)0)))) |
200 | goto merr; |
201 | |
202 | return ri; |
203 | |
204 | merr: |
205 | CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,205); |
206 | err: |
207 | EVP_CIPHER_CTX_free(ctx); |
208 | if (ri) |
209 | ASN1_item_free((ASN1_VALUE *)ri, &CMS_RecipientInfo_it); |
210 | X509_ALGOR_free(encalg); |
211 | |
212 | return NULL((void*)0); |
213 | } |
214 | |
215 | /* |
216 | * This is an implementation of the key wrapping mechanism in RFC3211, at |
217 | * some point this should go into EVP. |
218 | */ |
219 | |
220 | static int |
221 | kek_unwrap_key(unsigned char *out, size_t *outlen, const unsigned char *in, |
222 | size_t inlen, 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 | |
228 | if (inlen < 2 * blocklen) { |
229 | /* too small */ |
230 | return 0; |
231 | } |
232 | if (inlen % blocklen) { |
233 | /* Invalid size */ |
234 | return 0; |
235 | } |
236 | if ((tmp = malloc(inlen)) == NULL((void*)0)) { |
237 | CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,237); |
238 | return 0; |
239 | } |
240 | |
241 | /* setup IV by decrypting last two blocks */ |
242 | if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl, |
243 | in + inlen - 2 * blocklen, blocklen * 2) |
244 | /* |
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, tmp + inlen - blocklen, blocklen) |
250 | /* Can now decrypt first n - 1 blocks */ |
251 | || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen) |
252 | |
253 | /* Reset IV to original value */ |
254 | || !EVP_DecryptInit_ex(ctx, NULL((void*)0), NULL((void*)0), NULL((void*)0), NULL((void*)0)) |
255 | /* Decrypt again */ |
256 | || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen)) |
257 | goto err; |
258 | /* Check check bytes */ |
259 | if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) { |
260 | /* Check byte failure */ |
261 | goto err; |
262 | } |
263 | if (inlen < (size_t)(tmp[0] - 4)) { |
264 | /* Invalid length value */ |
265 | goto err; |
266 | } |
267 | *outlen = (size_t)tmp[0]; |
268 | memcpy(out, tmp + 4, *outlen); |
269 | rv = 1; |
270 | |
271 | err: |
272 | freezero(tmp, inlen); |
273 | |
274 | return rv; |
275 | } |
276 | |
277 | static int |
278 | kek_wrap_key(unsigned char *out, size_t *outlen, const unsigned char *in, |
279 | size_t inlen, EVP_CIPHER_CTX *ctx) |
280 | { |
281 | size_t blocklen = EVP_CIPHER_CTX_block_size(ctx); |
282 | size_t olen; |
283 | int dummy; |
284 | |
285 | /* |
286 | * First decide length of output buffer: need header and round up to |
287 | * multiple of block length. |
288 | */ |
289 | olen = (inlen + 4 + blocklen - 1) / blocklen; |
290 | olen *= blocklen; |
291 | if (olen < 2 * blocklen) { |
292 | /* Key too small */ |
293 | return 0; |
294 | } |
295 | if (inlen > 0xFF) { |
296 | /* Key too large */ |
297 | return 0; |
298 | } |
299 | if (out) { |
300 | /* Set header */ |
301 | out[0] = (unsigned char)inlen; |
302 | out[1] = in[0] ^ 0xFF; |
303 | out[2] = in[1] ^ 0xFF; |
304 | out[3] = in[2] ^ 0xFF; |
305 | memcpy(out + 4, in, inlen); |
306 | /* Add random padding to end */ |
307 | if (olen > inlen + 4) |
308 | arc4random_buf(out + 4 + inlen, olen - 4 - inlen); |
309 | /* Encrypt twice */ |
310 | if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen) || |
311 | !EVP_EncryptUpdate(ctx, out, &dummy, out, olen)) |
312 | return 0; |
313 | } |
314 | |
315 | *outlen = olen; |
316 | |
317 | return 1; |
318 | } |
319 | |
320 | /* Encrypt/Decrypt content key in PWRI recipient info */ |
321 | |
322 | int |
323 | cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri, |
324 | int en_de) |
325 | { |
326 | CMS_EncryptedContentInfo *ec; |
327 | CMS_PasswordRecipientInfo *pwri; |
328 | int r = 0; |
329 | X509_ALGOR *algtmp, *kekalg = NULL((void*)0); |
330 | EVP_CIPHER_CTX *kekctx = NULL((void*)0); |
331 | const EVP_CIPHER *kekcipher; |
332 | unsigned char *key = NULL((void*)0); |
333 | size_t keylen; |
334 | |
335 | ec = cms->d.envelopedData->encryptedContentInfo; |
336 | |
337 | pwri = ri->d.pwri; |
338 | |
339 | if (!pwri->pass) { |
340 | CMSerror(CMS_R_NO_PASSWORD)ERR_put_error(46,(0xfff),(178),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,340); |
341 | return 0; |
342 | } |
343 | algtmp = pwri->keyEncryptionAlgorithm; |
344 | |
345 | if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK893) { |
346 | CMSerror(CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM)ERR_put_error(46,(0xfff),(179),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,346); |
347 | return 0; |
348 | } |
349 | |
350 | if (algtmp->parameter != NULL((void*)0) && |
351 | algtmp->parameter->type == V_ASN1_SEQUENCE16 && |
352 | algtmp->parameter->value.sequence != NULL((void*)0)) |
353 | kekalg = ASN1_item_unpack(algtmp->parameter->value.sequence, |
354 | &X509_ALGOR_it); |
355 | |
356 | if (kekalg == NULL((void*)0)) { |
357 | CMSerror(CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER)ERR_put_error(46,(0xfff),(176),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,357); |
358 | return 0; |
359 | } |
360 | |
361 | kekcipher = EVP_get_cipherbyobj(kekalg->algorithm)EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(kekalg->algorithm ))); |
362 | if (!kekcipher) { |
363 | CMSerror(CMS_R_UNKNOWN_CIPHER)ERR_put_error(46,(0xfff),(148),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,363); |
364 | return 0; |
365 | } |
366 | |
367 | kekctx = EVP_CIPHER_CTX_new(); |
368 | if (kekctx == NULL((void*)0)) { |
369 | CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,369); |
370 | return 0; |
371 | } |
372 | /* Fixup cipher based on AlgorithmIdentifier to set IV etc */ |
373 | if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL((void*)0), NULL((void*)0), NULL((void*)0), en_de)) |
374 | goto err; |
375 | EVP_CIPHER_CTX_set_padding(kekctx, 0); |
376 | if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) { |
377 | CMSerror(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR)ERR_put_error(46,(0xfff),(102),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,377); |
378 | goto err; |
379 | } |
380 | |
381 | algtmp = pwri->keyDerivationAlgorithm; |
382 | |
383 | /* Finish password based key derivation to setup key in "ctx" */ |
384 | |
385 | if (EVP_PBE_CipherInit(algtmp->algorithm, (char *)pwri->pass, |
386 | pwri->passlen, algtmp->parameter, kekctx, en_de) < 0) { |
387 | CMSerror(ERR_R_EVP_LIB)ERR_put_error(46,(0xfff),(6),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,387); |
388 | goto err; |
389 | } |
390 | |
391 | /* Finally wrap/unwrap the key */ |
392 | |
393 | if (en_de) { |
394 | if (!kek_wrap_key(NULL((void*)0), &keylen, ec->key, ec->keylen, kekctx)) |
395 | goto err; |
396 | |
397 | key = malloc(keylen); |
398 | if (key == NULL((void*)0)) |
399 | goto err; |
400 | |
401 | if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx)) |
402 | goto err; |
403 | pwri->encryptedKey->data = key; |
404 | pwri->encryptedKey->length = keylen; |
405 | } else { |
406 | key = malloc(pwri->encryptedKey->length); |
407 | if (key == NULL((void*)0)) { |
408 | CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,408); |
409 | goto err; |
410 | } |
411 | if (!kek_unwrap_key(key, &keylen, pwri->encryptedKey->data, |
412 | pwri->encryptedKey->length, kekctx)) { |
413 | CMSerror(CMS_R_UNWRAP_FAILURE)ERR_put_error(46,(0xfff),(180),"/usr/src/lib/libcrypto/cms/cms_pwri.c" ,413); |
414 | goto err; |
415 | } |
416 | |
417 | freezero(ec->key, ec->keylen); |
418 | ec->key = key; |
419 | ec->keylen = keylen; |
420 | } |
421 | |
422 | r = 1; |
423 | |
424 | err: |
425 | EVP_CIPHER_CTX_free(kekctx); |
426 | if (!r) |
427 | free(key); |
428 | X509_ALGOR_free(kekalg); |
429 | |
430 | return r; |
431 | } |