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d02b48c6 | 1 | /* ssl/s3_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
82b0bf0b BM |
58 | /* ==================================================================== |
59 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. | |
60 | * | |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
66 | * notice, this list of conditions and the following disclaimer. | |
67 | * | |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
d02b48c6 | 113 | #include "ssl_locl.h" |
7b63c0fa | 114 | #include <openssl/evp.h> |
dbad1690 | 115 | #include <openssl/md5.h> |
d02b48c6 RE |
116 | |
117 | static unsigned char ssl3_pad_1[48]={ | |
118 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, | |
119 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, | |
120 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, | |
121 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, | |
122 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, | |
123 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; | |
124 | ||
125 | static unsigned char ssl3_pad_2[48]={ | |
126 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
127 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
128 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
129 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
130 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
131 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; | |
132 | ||
58964a49 | 133 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, |
f2d9a32c | 134 | const char *sender, int len, unsigned char *p); |
58964a49 | 135 | |
027e257b | 136 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) |
58964a49 | 137 | { |
323f289c DSH |
138 | EVP_MD_CTX m5; |
139 | EVP_MD_CTX s1; | |
42748c08 | 140 | unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; |
58964a49 | 141 | unsigned char c='A'; |
27545970 | 142 | unsigned int i,j,k; |
58964a49 | 143 | |
ca570cfd UM |
144 | #ifdef CHARSET_EBCDIC |
145 | c = os_toascii[c]; /*'A' in ASCII */ | |
146 | #endif | |
58964a49 | 147 | k=0; |
dbad1690 BL |
148 | EVP_MD_CTX_init(&m5); |
149 | EVP_MD_CTX_init(&s1); | |
27545970 | 150 | for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) |
58964a49 RE |
151 | { |
152 | k++; | |
027e257b BM |
153 | if (k > sizeof buf) |
154 | { | |
155 | /* bug: 'buf' is too small for this ciphersuite */ | |
156 | SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); | |
157 | return 0; | |
158 | } | |
159 | ||
58964a49 RE |
160 | for (j=0; j<k; j++) |
161 | buf[j]=c; | |
162 | c++; | |
20d2186c | 163 | EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); |
323f289c DSH |
164 | EVP_DigestUpdate(&s1,buf,k); |
165 | EVP_DigestUpdate(&s1,s->session->master_key, | |
58964a49 | 166 | s->session->master_key_length); |
323f289c DSH |
167 | EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); |
168 | EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); | |
20d2186c | 169 | EVP_DigestFinal_ex(&s1,smd,NULL); |
58964a49 | 170 | |
20d2186c | 171 | EVP_DigestInit_ex(&m5,EVP_md5(), NULL); |
323f289c | 172 | EVP_DigestUpdate(&m5,s->session->master_key, |
58964a49 | 173 | s->session->master_key_length); |
323f289c | 174 | EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); |
27545970 | 175 | if ((int)(i+MD5_DIGEST_LENGTH) > num) |
58964a49 | 176 | { |
20d2186c | 177 | EVP_DigestFinal_ex(&m5,smd,NULL); |
58964a49 RE |
178 | memcpy(km,smd,(num-i)); |
179 | } | |
180 | else | |
20d2186c | 181 | EVP_DigestFinal_ex(&m5,km,NULL); |
58964a49 RE |
182 | |
183 | km+=MD5_DIGEST_LENGTH; | |
184 | } | |
4579924b | 185 | OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); |
dbad1690 BL |
186 | EVP_MD_CTX_cleanup(&m5); |
187 | EVP_MD_CTX_cleanup(&s1); | |
027e257b | 188 | return 1; |
58964a49 RE |
189 | } |
190 | ||
6b691a5c | 191 | int ssl3_change_cipher_state(SSL *s, int which) |
d02b48c6 RE |
192 | { |
193 | unsigned char *p,*key_block,*mac_secret; | |
194 | unsigned char exp_key[EVP_MAX_KEY_LENGTH]; | |
54a656ef | 195 | unsigned char exp_iv[EVP_MAX_IV_LENGTH]; |
d02b48c6 RE |
196 | unsigned char *ms,*key,*iv,*er1,*er2; |
197 | EVP_CIPHER_CTX *dd; | |
e778802f | 198 | const EVP_CIPHER *c; |
09b6c2ef | 199 | #ifndef OPENSSL_NO_COMP |
dfeab068 | 200 | COMP_METHOD *comp; |
09b6c2ef | 201 | #endif |
e778802f | 202 | const EVP_MD *m; |
323f289c | 203 | EVP_MD_CTX md; |
d8ec0dcf | 204 | int is_exp,n,i,j,k,cl; |
28797374 | 205 | int reuse_dd = 0; |
d02b48c6 | 206 | |
d8ec0dcf | 207 | is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); |
d02b48c6 RE |
208 | c=s->s3->tmp.new_sym_enc; |
209 | m=s->s3->tmp.new_hash; | |
09b6c2ef | 210 | #ifndef OPENSSL_NO_COMP |
413c4f45 MC |
211 | if (s->s3->tmp.new_compression == NULL) |
212 | comp=NULL; | |
213 | else | |
214 | comp=s->s3->tmp.new_compression->method; | |
09b6c2ef | 215 | #endif |
d02b48c6 RE |
216 | key_block=s->s3->tmp.key_block; |
217 | ||
218 | if (which & SSL3_CC_READ) | |
219 | { | |
28797374 BM |
220 | if (s->enc_read_ctx != NULL) |
221 | reuse_dd = 1; | |
222 | else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
d02b48c6 RE |
223 | goto err; |
224 | dd= s->enc_read_ctx; | |
225 | s->read_hash=m; | |
09b6c2ef | 226 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
227 | /* COMPRESS */ |
228 | if (s->expand != NULL) | |
229 | { | |
230 | COMP_CTX_free(s->expand); | |
231 | s->expand=NULL; | |
232 | } | |
233 | if (comp != NULL) | |
234 | { | |
235 | s->expand=COMP_CTX_new(comp); | |
236 | if (s->expand == NULL) | |
237 | { | |
238 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
239 | goto err2; | |
240 | } | |
413c4f45 MC |
241 | if (s->s3->rrec.comp == NULL) |
242 | s->s3->rrec.comp=(unsigned char *) | |
26a3a48d | 243 | OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); |
dfeab068 RE |
244 | if (s->s3->rrec.comp == NULL) |
245 | goto err; | |
246 | } | |
09b6c2ef | 247 | #endif |
d02b48c6 RE |
248 | memset(&(s->s3->read_sequence[0]),0,8); |
249 | mac_secret= &(s->s3->read_mac_secret[0]); | |
250 | } | |
251 | else | |
252 | { | |
28797374 BM |
253 | if (s->enc_write_ctx != NULL) |
254 | reuse_dd = 1; | |
255 | else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
d02b48c6 RE |
256 | goto err; |
257 | dd= s->enc_write_ctx; | |
258 | s->write_hash=m; | |
09b6c2ef | 259 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
260 | /* COMPRESS */ |
261 | if (s->compress != NULL) | |
262 | { | |
263 | COMP_CTX_free(s->compress); | |
264 | s->compress=NULL; | |
265 | } | |
266 | if (comp != NULL) | |
267 | { | |
268 | s->compress=COMP_CTX_new(comp); | |
269 | if (s->compress == NULL) | |
270 | { | |
271 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
272 | goto err2; | |
273 | } | |
274 | } | |
09b6c2ef | 275 | #endif |
d02b48c6 RE |
276 | memset(&(s->s3->write_sequence[0]),0,8); |
277 | mac_secret= &(s->s3->write_mac_secret[0]); | |
278 | } | |
279 | ||
28797374 BM |
280 | if (reuse_dd) |
281 | EVP_CIPHER_CTX_cleanup(dd); | |
58964a49 RE |
282 | EVP_CIPHER_CTX_init(dd); |
283 | ||
d02b48c6 RE |
284 | p=s->s3->tmp.key_block; |
285 | i=EVP_MD_size(m); | |
436d318c | 286 | cl=EVP_CIPHER_key_length(c); |
d8ec0dcf | 287 | j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? |
06ab81f9 | 288 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; |
d8ec0dcf | 289 | /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ |
d02b48c6 RE |
290 | k=EVP_CIPHER_iv_length(c); |
291 | if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || | |
292 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) | |
293 | { | |
294 | ms= &(p[ 0]); n=i+i; | |
295 | key= &(p[ n]); n+=j+j; | |
296 | iv= &(p[ n]); n+=k+k; | |
297 | er1= &(s->s3->client_random[0]); | |
298 | er2= &(s->s3->server_random[0]); | |
299 | } | |
300 | else | |
301 | { | |
302 | n=i; | |
303 | ms= &(p[ n]); n+=i+j; | |
304 | key= &(p[ n]); n+=j+k; | |
305 | iv= &(p[ n]); n+=k; | |
306 | er1= &(s->s3->server_random[0]); | |
307 | er2= &(s->s3->client_random[0]); | |
308 | } | |
309 | ||
310 | if (n > s->s3->tmp.key_block_length) | |
311 | { | |
5277d7cb | 312 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); |
d02b48c6 RE |
313 | goto err2; |
314 | } | |
315 | ||
dbad1690 | 316 | EVP_MD_CTX_init(&md); |
d02b48c6 | 317 | memcpy(mac_secret,ms,i); |
d8ec0dcf | 318 | if (is_exp) |
d02b48c6 RE |
319 | { |
320 | /* In here I set both the read and write key/iv to the | |
321 | * same value since only the correct one will be used :-). | |
322 | */ | |
20d2186c | 323 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
323f289c DSH |
324 | EVP_DigestUpdate(&md,key,j); |
325 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); | |
326 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
20d2186c | 327 | EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); |
d02b48c6 RE |
328 | key= &(exp_key[0]); |
329 | ||
58964a49 RE |
330 | if (k > 0) |
331 | { | |
20d2186c | 332 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
323f289c DSH |
333 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); |
334 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
20d2186c | 335 | EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); |
58964a49 RE |
336 | iv= &(exp_iv[0]); |
337 | } | |
d02b48c6 RE |
338 | } |
339 | ||
58964a49 | 340 | s->session->key_arg_length=0; |
d02b48c6 | 341 | |
581f1c84 | 342 | EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); |
58964a49 | 343 | |
4579924b RL |
344 | OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); |
345 | OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); | |
dbad1690 | 346 | EVP_MD_CTX_cleanup(&md); |
d02b48c6 RE |
347 | return(1); |
348 | err: | |
349 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); | |
350 | err2: | |
351 | return(0); | |
352 | } | |
353 | ||
6b691a5c | 354 | int ssl3_setup_key_block(SSL *s) |
d02b48c6 RE |
355 | { |
356 | unsigned char *p; | |
e778802f BL |
357 | const EVP_CIPHER *c; |
358 | const EVP_MD *hash; | |
06ab81f9 | 359 | int num; |
82b0bf0b | 360 | int ret = 0; |
413c4f45 | 361 | SSL_COMP *comp; |
d02b48c6 RE |
362 | |
363 | if (s->s3->tmp.key_block_length != 0) | |
364 | return(1); | |
365 | ||
413c4f45 | 366 | if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) |
d02b48c6 RE |
367 | { |
368 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); | |
369 | return(0); | |
370 | } | |
371 | ||
372 | s->s3->tmp.new_sym_enc=c; | |
373 | s->s3->tmp.new_hash=hash; | |
09b6c2ef DSH |
374 | #ifdef OPENSSL_NO_COMP |
375 | s->s3->tmp.new_compression=NULL; | |
376 | #else | |
413c4f45 | 377 | s->s3->tmp.new_compression=comp; |
09b6c2ef | 378 | #endif |
d02b48c6 | 379 | |
d02b48c6 RE |
380 | num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); |
381 | num*=2; | |
382 | ||
383 | ssl3_cleanup_key_block(s); | |
384 | ||
26a3a48d | 385 | if ((p=OPENSSL_malloc(num)) == NULL) |
d02b48c6 RE |
386 | goto err; |
387 | ||
388 | s->s3->tmp.key_block_length=num; | |
389 | s->s3->tmp.key_block=p; | |
390 | ||
82b0bf0b BM |
391 | ret = ssl3_generate_key_block(s,p,num); |
392 | ||
c21506ba BM |
393 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) |
394 | { | |
395 | /* enable vulnerability countermeasure for CBC ciphers with | |
396 | * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) | |
397 | */ | |
398 | s->s3->need_empty_fragments = 1; | |
399 | ||
d1d0be3c BM |
400 | if (s->session->cipher != NULL) |
401 | { | |
402 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) | |
403 | s->s3->need_empty_fragments = 0; | |
404 | ||
82b0bf0b | 405 | #ifndef OPENSSL_NO_RC4 |
d1d0be3c BM |
406 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) |
407 | s->s3->need_empty_fragments = 0; | |
82b0bf0b | 408 | #endif |
d1d0be3c | 409 | } |
c21506ba | 410 | } |
d02b48c6 | 411 | |
82b0bf0b BM |
412 | return ret; |
413 | ||
d02b48c6 RE |
414 | err: |
415 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); | |
416 | return(0); | |
417 | } | |
418 | ||
6b691a5c | 419 | void ssl3_cleanup_key_block(SSL *s) |
d02b48c6 RE |
420 | { |
421 | if (s->s3->tmp.key_block != NULL) | |
422 | { | |
4579924b | 423 | OPENSSL_cleanse(s->s3->tmp.key_block, |
d02b48c6 | 424 | s->s3->tmp.key_block_length); |
26a3a48d | 425 | OPENSSL_free(s->s3->tmp.key_block); |
d02b48c6 RE |
426 | s->s3->tmp.key_block=NULL; |
427 | } | |
428 | s->s3->tmp.key_block_length=0; | |
429 | } | |
430 | ||
6b691a5c | 431 | int ssl3_enc(SSL *s, int send) |
d02b48c6 RE |
432 | { |
433 | SSL3_RECORD *rec; | |
434 | EVP_CIPHER_CTX *ds; | |
435 | unsigned long l; | |
436 | int bs,i; | |
e778802f | 437 | const EVP_CIPHER *enc; |
d02b48c6 RE |
438 | |
439 | if (send) | |
440 | { | |
441 | ds=s->enc_write_ctx; | |
442 | rec= &(s->s3->wrec); | |
443 | if (s->enc_write_ctx == NULL) | |
dfeab068 | 444 | enc=NULL; |
d02b48c6 | 445 | else |
d02b48c6 | 446 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); |
d02b48c6 RE |
447 | } |
448 | else | |
449 | { | |
450 | ds=s->enc_read_ctx; | |
451 | rec= &(s->s3->rrec); | |
452 | if (s->enc_read_ctx == NULL) | |
dfeab068 | 453 | enc=NULL; |
d02b48c6 | 454 | else |
d02b48c6 | 455 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); |
d02b48c6 RE |
456 | } |
457 | ||
458 | if ((s->session == NULL) || (ds == NULL) || | |
dfeab068 | 459 | (enc == NULL)) |
d02b48c6 | 460 | { |
44e48abc | 461 | memmove(rec->data,rec->input,rec->length); |
d02b48c6 RE |
462 | rec->input=rec->data; |
463 | } | |
464 | else | |
465 | { | |
466 | l=rec->length; | |
467 | bs=EVP_CIPHER_block_size(ds->cipher); | |
468 | ||
dfeab068 RE |
469 | /* COMPRESS */ |
470 | ||
d02b48c6 RE |
471 | if ((bs != 1) && send) |
472 | { | |
473 | i=bs-((int)l%bs); | |
474 | ||
475 | /* we need to add 'i-1' padding bytes */ | |
476 | l+=i; | |
477 | rec->length+=i; | |
478 | rec->input[l-1]=(i-1); | |
479 | } | |
285b4275 BM |
480 | |
481 | if (!send) | |
482 | { | |
483 | if (l == 0 || l%bs != 0) | |
484 | { | |
485 | SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); | |
ee60d9fb BM |
486 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); |
487 | return 0; | |
285b4275 | 488 | } |
ea513641 | 489 | /* otherwise, rec->length >= bs */ |
285b4275 BM |
490 | } |
491 | ||
d02b48c6 RE |
492 | EVP_Cipher(ds,rec->data,rec->input,l); |
493 | ||
494 | if ((bs != 1) && !send) | |
495 | { | |
496 | i=rec->data[l-1]+1; | |
285b4275 | 497 | /* SSL 3.0 bounds the number of padding bytes by the block size; |
ea513641 | 498 | * padding bytes (except the last one) are arbitrary */ |
d02b48c6 RE |
499 | if (i > bs) |
500 | { | |
ee60d9fb BM |
501 | /* Incorrect padding. SSLerr() and ssl3_alert are done |
502 | * by caller: we don't want to reveal whether this is | |
965b6dad BM |
503 | * a decryption error or a MAC verification failure |
504 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ | |
ee60d9fb | 505 | return -1; |
d02b48c6 | 506 | } |
ea513641 | 507 | /* now i <= bs <= rec->length */ |
d02b48c6 RE |
508 | rec->length-=i; |
509 | } | |
510 | } | |
511 | return(1); | |
512 | } | |
513 | ||
6b691a5c | 514 | void ssl3_init_finished_mac(SSL *s) |
d02b48c6 | 515 | { |
20d2186c DSH |
516 | EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); |
517 | EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); | |
d02b48c6 RE |
518 | } |
519 | ||
6b691a5c | 520 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) |
d02b48c6 RE |
521 | { |
522 | EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); | |
523 | EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); | |
524 | } | |
525 | ||
6b691a5c | 526 | int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) |
58964a49 RE |
527 | { |
528 | return(ssl3_handshake_mac(s,ctx,NULL,0,p)); | |
529 | } | |
530 | ||
6b691a5c | 531 | int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, |
245206ea | 532 | const char *sender, int len, unsigned char *p) |
58964a49 RE |
533 | { |
534 | int ret; | |
535 | ||
536 | ret=ssl3_handshake_mac(s,ctx1,sender,len,p); | |
537 | p+=ret; | |
538 | ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); | |
539 | return(ret); | |
540 | } | |
541 | ||
6b691a5c | 542 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, |
f2d9a32c | 543 | const char *sender, int len, unsigned char *p) |
d02b48c6 RE |
544 | { |
545 | unsigned int ret; | |
546 | int npad,n; | |
547 | unsigned int i; | |
548 | unsigned char md_buf[EVP_MAX_MD_SIZE]; | |
549 | EVP_MD_CTX ctx; | |
550 | ||
dbad1690 | 551 | EVP_MD_CTX_init(&ctx); |
20d2186c | 552 | EVP_MD_CTX_copy_ex(&ctx,in_ctx); |
d02b48c6 RE |
553 | |
554 | n=EVP_MD_CTX_size(&ctx); | |
555 | npad=(48/n)*n; | |
556 | ||
557 | if (sender != NULL) | |
58964a49 | 558 | EVP_DigestUpdate(&ctx,sender,len); |
d02b48c6 RE |
559 | EVP_DigestUpdate(&ctx,s->session->master_key, |
560 | s->session->master_key_length); | |
561 | EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); | |
20d2186c | 562 | EVP_DigestFinal_ex(&ctx,md_buf,&i); |
d02b48c6 | 563 | |
20d2186c | 564 | EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); |
d02b48c6 RE |
565 | EVP_DigestUpdate(&ctx,s->session->master_key, |
566 | s->session->master_key_length); | |
567 | EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); | |
568 | EVP_DigestUpdate(&ctx,md_buf,i); | |
20d2186c | 569 | EVP_DigestFinal_ex(&ctx,p,&ret); |
d02b48c6 | 570 | |
dbad1690 | 571 | EVP_MD_CTX_cleanup(&ctx); |
d02b48c6 RE |
572 | |
573 | return((int)ret); | |
574 | } | |
575 | ||
6b691a5c | 576 | int ssl3_mac(SSL *ssl, unsigned char *md, int send) |
d02b48c6 RE |
577 | { |
578 | SSL3_RECORD *rec; | |
579 | unsigned char *mac_sec,*seq; | |
580 | EVP_MD_CTX md_ctx; | |
e778802f | 581 | const EVP_MD *hash; |
d02b48c6 RE |
582 | unsigned char *p,rec_char; |
583 | unsigned int md_size; | |
36d16f8e | 584 | int npad; |
d02b48c6 RE |
585 | |
586 | if (send) | |
587 | { | |
588 | rec= &(ssl->s3->wrec); | |
589 | mac_sec= &(ssl->s3->write_mac_secret[0]); | |
590 | seq= &(ssl->s3->write_sequence[0]); | |
591 | hash=ssl->write_hash; | |
592 | } | |
593 | else | |
594 | { | |
595 | rec= &(ssl->s3->rrec); | |
596 | mac_sec= &(ssl->s3->read_mac_secret[0]); | |
597 | seq= &(ssl->s3->read_sequence[0]); | |
598 | hash=ssl->read_hash; | |
599 | } | |
600 | ||
601 | md_size=EVP_MD_size(hash); | |
602 | npad=(48/md_size)*md_size; | |
603 | ||
d02b48c6 | 604 | /* Chop the digest off the end :-) */ |
dbad1690 | 605 | EVP_MD_CTX_init(&md_ctx); |
d02b48c6 | 606 | |
20d2186c | 607 | EVP_DigestInit_ex( &md_ctx,hash, NULL); |
d02b48c6 RE |
608 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
609 | EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); | |
610 | EVP_DigestUpdate(&md_ctx,seq,8); | |
611 | rec_char=rec->type; | |
612 | EVP_DigestUpdate(&md_ctx,&rec_char,1); | |
613 | p=md; | |
614 | s2n(rec->length,p); | |
615 | EVP_DigestUpdate(&md_ctx,md,2); | |
616 | EVP_DigestUpdate(&md_ctx,rec->input,rec->length); | |
20d2186c | 617 | EVP_DigestFinal_ex( &md_ctx,md,NULL); |
d02b48c6 | 618 | |
20d2186c | 619 | EVP_DigestInit_ex( &md_ctx,hash, NULL); |
d02b48c6 RE |
620 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
621 | EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); | |
622 | EVP_DigestUpdate(&md_ctx,md,md_size); | |
20d2186c | 623 | EVP_DigestFinal_ex( &md_ctx,md,&md_size); |
d02b48c6 | 624 | |
dbad1690 BL |
625 | EVP_MD_CTX_cleanup(&md_ctx); |
626 | ||
36d16f8e BL |
627 | ssl3_record_sequence_update(seq); |
628 | return(md_size); | |
629 | } | |
630 | ||
631 | void ssl3_record_sequence_update(unsigned char *seq) | |
632 | { | |
633 | int i; | |
634 | ||
d02b48c6 | 635 | for (i=7; i>=0; i--) |
1876cc32 BM |
636 | { |
637 | ++seq[i]; | |
638 | if (seq[i] != 0) break; | |
639 | } | |
d02b48c6 RE |
640 | } |
641 | ||
6b691a5c UM |
642 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, |
643 | int len) | |
d02b48c6 | 644 | { |
e778802f | 645 | static const unsigned char *salt[3]={ |
ca570cfd | 646 | #ifndef CHARSET_EBCDIC |
e778802f BL |
647 | (const unsigned char *)"A", |
648 | (const unsigned char *)"BB", | |
649 | (const unsigned char *)"CCC", | |
ca570cfd UM |
650 | #else |
651 | (const unsigned char *)"\x41", | |
652 | (const unsigned char *)"\x42\x42", | |
653 | (const unsigned char *)"\x43\x43\x43", | |
654 | #endif | |
d02b48c6 RE |
655 | }; |
656 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
657 | EVP_MD_CTX ctx; | |
658 | int i,ret=0; | |
659 | unsigned int n; | |
660 | ||
dbad1690 | 661 | EVP_MD_CTX_init(&ctx); |
d02b48c6 RE |
662 | for (i=0; i<3; i++) |
663 | { | |
20d2186c | 664 | EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); |
e778802f | 665 | EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); |
d02b48c6 RE |
666 | EVP_DigestUpdate(&ctx,p,len); |
667 | EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), | |
668 | SSL3_RANDOM_SIZE); | |
669 | EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), | |
670 | SSL3_RANDOM_SIZE); | |
20d2186c | 671 | EVP_DigestFinal_ex(&ctx,buf,&n); |
d02b48c6 | 672 | |
20d2186c | 673 | EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); |
d02b48c6 RE |
674 | EVP_DigestUpdate(&ctx,p,len); |
675 | EVP_DigestUpdate(&ctx,buf,n); | |
20d2186c | 676 | EVP_DigestFinal_ex(&ctx,out,&n); |
d02b48c6 RE |
677 | out+=n; |
678 | ret+=n; | |
679 | } | |
dbad1690 | 680 | EVP_MD_CTX_cleanup(&ctx); |
d02b48c6 RE |
681 | return(ret); |
682 | } | |
683 | ||
6b691a5c | 684 | int ssl3_alert_code(int code) |
58964a49 RE |
685 | { |
686 | switch (code) | |
687 | { | |
688 | case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); | |
689 | case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); | |
690 | case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); | |
691 | case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); | |
692 | case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); | |
693 | case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); | |
694 | case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
695 | case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); | |
696 | case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); | |
697 | case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); | |
698 | case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); | |
699 | case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); | |
700 | case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); | |
701 | case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); | |
702 | case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); | |
703 | case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); | |
704 | case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
705 | case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
657e60fa | 706 | case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); |
58964a49 RE |
707 | case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); |
708 | case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); | |
709 | case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
657e60fa | 710 | case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); |
58964a49 | 711 | case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ |
d32f888d BM |
712 | case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); |
713 | case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
f7914dbf | 714 | case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); |
d32f888d BM |
715 | case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); |
716 | case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
58964a49 RE |
717 | default: return(-1); |
718 | } | |
719 | } | |
720 |