]>
Commit | Line | Data |
---|---|---|
1 | /* ssl/s3_enc.c */ | |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
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 | */ | |
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 | */ | |
111 | ||
112 | #include <stdio.h> | |
113 | #include "ssl_locl.h" | |
114 | #include <openssl/evp.h> | |
115 | #include <openssl/md5.h> | |
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 | ||
133 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, | |
134 | const char *sender, int len, unsigned char *p); | |
135 | ||
136 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) | |
137 | { | |
138 | EVP_MD_CTX m5; | |
139 | EVP_MD_CTX s1; | |
140 | unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; | |
141 | unsigned char c='A'; | |
142 | unsigned int i,j,k; | |
143 | ||
144 | #ifdef CHARSET_EBCDIC | |
145 | c = os_toascii[c]; /*'A' in ASCII */ | |
146 | #endif | |
147 | k=0; | |
148 | EVP_MD_CTX_init(&m5); | |
149 | EVP_MD_CTX_init(&s1); | |
150 | for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) | |
151 | { | |
152 | k++; | |
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 | ||
160 | for (j=0; j<k; j++) | |
161 | buf[j]=c; | |
162 | c++; | |
163 | EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); | |
164 | EVP_DigestUpdate(&s1,buf,k); | |
165 | EVP_DigestUpdate(&s1,s->session->master_key, | |
166 | s->session->master_key_length); | |
167 | EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); | |
168 | EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); | |
169 | EVP_DigestFinal_ex(&s1,smd,NULL); | |
170 | ||
171 | EVP_DigestInit_ex(&m5,EVP_md5(), NULL); | |
172 | EVP_DigestUpdate(&m5,s->session->master_key, | |
173 | s->session->master_key_length); | |
174 | EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); | |
175 | if ((int)(i+MD5_DIGEST_LENGTH) > num) | |
176 | { | |
177 | EVP_DigestFinal_ex(&m5,smd,NULL); | |
178 | memcpy(km,smd,(num-i)); | |
179 | } | |
180 | else | |
181 | EVP_DigestFinal_ex(&m5,km,NULL); | |
182 | ||
183 | km+=MD5_DIGEST_LENGTH; | |
184 | } | |
185 | OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); | |
186 | EVP_MD_CTX_cleanup(&m5); | |
187 | EVP_MD_CTX_cleanup(&s1); | |
188 | return 1; | |
189 | } | |
190 | ||
191 | int ssl3_change_cipher_state(SSL *s, int which) | |
192 | { | |
193 | unsigned char *p,*key_block,*mac_secret; | |
194 | unsigned char exp_key[EVP_MAX_KEY_LENGTH]; | |
195 | unsigned char exp_iv[EVP_MAX_IV_LENGTH]; | |
196 | unsigned char *ms,*key,*iv,*er1,*er2; | |
197 | EVP_CIPHER_CTX *dd; | |
198 | const EVP_CIPHER *c; | |
199 | COMP_METHOD *comp; | |
200 | const EVP_MD *m; | |
201 | EVP_MD_CTX md; | |
202 | int exp,n,i,j,k,cl; | |
203 | int reuse_dd = 0; | |
204 | ||
205 | exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); | |
206 | c=s->s3->tmp.new_sym_enc; | |
207 | m=s->s3->tmp.new_hash; | |
208 | if (s->s3->tmp.new_compression == NULL) | |
209 | comp=NULL; | |
210 | else | |
211 | comp=s->s3->tmp.new_compression->method; | |
212 | key_block=s->s3->tmp.key_block; | |
213 | ||
214 | if (which & SSL3_CC_READ) | |
215 | { | |
216 | if (s->enc_read_ctx != NULL) | |
217 | reuse_dd = 1; | |
218 | else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
219 | goto err; | |
220 | dd= s->enc_read_ctx; | |
221 | s->read_hash=m; | |
222 | /* COMPRESS */ | |
223 | if (s->expand != NULL) | |
224 | { | |
225 | COMP_CTX_free(s->expand); | |
226 | s->expand=NULL; | |
227 | } | |
228 | if (comp != NULL) | |
229 | { | |
230 | s->expand=COMP_CTX_new(comp); | |
231 | if (s->expand == NULL) | |
232 | { | |
233 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
234 | goto err2; | |
235 | } | |
236 | if (s->s3->rrec.comp == NULL) | |
237 | s->s3->rrec.comp=(unsigned char *) | |
238 | OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); | |
239 | if (s->s3->rrec.comp == NULL) | |
240 | goto err; | |
241 | } | |
242 | memset(&(s->s3->read_sequence[0]),0,8); | |
243 | mac_secret= &(s->s3->read_mac_secret[0]); | |
244 | } | |
245 | else | |
246 | { | |
247 | if (s->enc_write_ctx != NULL) | |
248 | reuse_dd = 1; | |
249 | else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
250 | goto err; | |
251 | dd= s->enc_write_ctx; | |
252 | s->write_hash=m; | |
253 | /* COMPRESS */ | |
254 | if (s->compress != NULL) | |
255 | { | |
256 | COMP_CTX_free(s->compress); | |
257 | s->compress=NULL; | |
258 | } | |
259 | if (comp != NULL) | |
260 | { | |
261 | s->compress=COMP_CTX_new(comp); | |
262 | if (s->compress == NULL) | |
263 | { | |
264 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
265 | goto err2; | |
266 | } | |
267 | } | |
268 | memset(&(s->s3->write_sequence[0]),0,8); | |
269 | mac_secret= &(s->s3->write_mac_secret[0]); | |
270 | } | |
271 | ||
272 | if (reuse_dd) | |
273 | EVP_CIPHER_CTX_cleanup(dd); | |
274 | EVP_CIPHER_CTX_init(dd); | |
275 | ||
276 | p=s->s3->tmp.key_block; | |
277 | i=EVP_MD_size(m); | |
278 | cl=EVP_CIPHER_key_length(c); | |
279 | j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? | |
280 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; | |
281 | /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ | |
282 | k=EVP_CIPHER_iv_length(c); | |
283 | if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || | |
284 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) | |
285 | { | |
286 | ms= &(p[ 0]); n=i+i; | |
287 | key= &(p[ n]); n+=j+j; | |
288 | iv= &(p[ n]); n+=k+k; | |
289 | er1= &(s->s3->client_random[0]); | |
290 | er2= &(s->s3->server_random[0]); | |
291 | } | |
292 | else | |
293 | { | |
294 | n=i; | |
295 | ms= &(p[ n]); n+=i+j; | |
296 | key= &(p[ n]); n+=j+k; | |
297 | iv= &(p[ n]); n+=k; | |
298 | er1= &(s->s3->server_random[0]); | |
299 | er2= &(s->s3->client_random[0]); | |
300 | } | |
301 | ||
302 | if (n > s->s3->tmp.key_block_length) | |
303 | { | |
304 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); | |
305 | goto err2; | |
306 | } | |
307 | ||
308 | EVP_MD_CTX_init(&md); | |
309 | memcpy(mac_secret,ms,i); | |
310 | if (exp) | |
311 | { | |
312 | /* In here I set both the read and write key/iv to the | |
313 | * same value since only the correct one will be used :-). | |
314 | */ | |
315 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); | |
316 | EVP_DigestUpdate(&md,key,j); | |
317 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); | |
318 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
319 | EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); | |
320 | key= &(exp_key[0]); | |
321 | ||
322 | if (k > 0) | |
323 | { | |
324 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); | |
325 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); | |
326 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
327 | EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); | |
328 | iv= &(exp_iv[0]); | |
329 | } | |
330 | } | |
331 | ||
332 | s->session->key_arg_length=0; | |
333 | ||
334 | EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); | |
335 | ||
336 | OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); | |
337 | OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); | |
338 | EVP_MD_CTX_cleanup(&md); | |
339 | return(1); | |
340 | err: | |
341 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); | |
342 | err2: | |
343 | return(0); | |
344 | } | |
345 | ||
346 | int ssl3_setup_key_block(SSL *s) | |
347 | { | |
348 | unsigned char *p; | |
349 | const EVP_CIPHER *c; | |
350 | const EVP_MD *hash; | |
351 | int num; | |
352 | int ret = 0; | |
353 | SSL_COMP *comp; | |
354 | ||
355 | if (s->s3->tmp.key_block_length != 0) | |
356 | return(1); | |
357 | ||
358 | if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) | |
359 | { | |
360 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); | |
361 | return(0); | |
362 | } | |
363 | ||
364 | s->s3->tmp.new_sym_enc=c; | |
365 | s->s3->tmp.new_hash=hash; | |
366 | s->s3->tmp.new_compression=comp; | |
367 | ||
368 | num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); | |
369 | num*=2; | |
370 | ||
371 | ssl3_cleanup_key_block(s); | |
372 | ||
373 | if ((p=OPENSSL_malloc(num)) == NULL) | |
374 | goto err; | |
375 | ||
376 | s->s3->tmp.key_block_length=num; | |
377 | s->s3->tmp.key_block=p; | |
378 | ||
379 | ret = ssl3_generate_key_block(s,p,num); | |
380 | ||
381 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) | |
382 | { | |
383 | /* enable vulnerability countermeasure for CBC ciphers with | |
384 | * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) | |
385 | */ | |
386 | s->s3->need_empty_fragments = 1; | |
387 | ||
388 | if (s->session->cipher != NULL) | |
389 | { | |
390 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) | |
391 | s->s3->need_empty_fragments = 0; | |
392 | ||
393 | #ifndef OPENSSL_NO_RC4 | |
394 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) | |
395 | s->s3->need_empty_fragments = 0; | |
396 | #endif | |
397 | } | |
398 | } | |
399 | ||
400 | return ret; | |
401 | ||
402 | err: | |
403 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); | |
404 | return(0); | |
405 | } | |
406 | ||
407 | void ssl3_cleanup_key_block(SSL *s) | |
408 | { | |
409 | if (s->s3->tmp.key_block != NULL) | |
410 | { | |
411 | OPENSSL_cleanse(s->s3->tmp.key_block, | |
412 | s->s3->tmp.key_block_length); | |
413 | OPENSSL_free(s->s3->tmp.key_block); | |
414 | s->s3->tmp.key_block=NULL; | |
415 | } | |
416 | s->s3->tmp.key_block_length=0; | |
417 | } | |
418 | ||
419 | int ssl3_enc(SSL *s, int send) | |
420 | { | |
421 | SSL3_RECORD *rec; | |
422 | EVP_CIPHER_CTX *ds; | |
423 | unsigned long l; | |
424 | int bs,i; | |
425 | const EVP_CIPHER *enc; | |
426 | ||
427 | if (send) | |
428 | { | |
429 | ds=s->enc_write_ctx; | |
430 | rec= &(s->s3->wrec); | |
431 | if (s->enc_write_ctx == NULL) | |
432 | enc=NULL; | |
433 | else | |
434 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
435 | } | |
436 | else | |
437 | { | |
438 | ds=s->enc_read_ctx; | |
439 | rec= &(s->s3->rrec); | |
440 | if (s->enc_read_ctx == NULL) | |
441 | enc=NULL; | |
442 | else | |
443 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
444 | } | |
445 | ||
446 | if ((s->session == NULL) || (ds == NULL) || | |
447 | (enc == NULL)) | |
448 | { | |
449 | memmove(rec->data,rec->input,rec->length); | |
450 | rec->input=rec->data; | |
451 | } | |
452 | else | |
453 | { | |
454 | l=rec->length; | |
455 | bs=EVP_CIPHER_block_size(ds->cipher); | |
456 | ||
457 | /* COMPRESS */ | |
458 | ||
459 | if ((bs != 1) && send) | |
460 | { | |
461 | i=bs-((int)l%bs); | |
462 | ||
463 | /* we need to add 'i-1' padding bytes */ | |
464 | l+=i; | |
465 | rec->length+=i; | |
466 | rec->input[l-1]=(i-1); | |
467 | } | |
468 | ||
469 | if (!send) | |
470 | { | |
471 | if (l == 0 || l%bs != 0) | |
472 | { | |
473 | SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); | |
474 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); | |
475 | return 0; | |
476 | } | |
477 | /* otherwise, rec->length >= bs */ | |
478 | } | |
479 | ||
480 | EVP_Cipher(ds,rec->data,rec->input,l); | |
481 | ||
482 | if ((bs != 1) && !send) | |
483 | { | |
484 | i=rec->data[l-1]+1; | |
485 | /* SSL 3.0 bounds the number of padding bytes by the block size; | |
486 | * padding bytes (except the last one) are arbitrary */ | |
487 | if (i > bs) | |
488 | { | |
489 | /* Incorrect padding. SSLerr() and ssl3_alert are done | |
490 | * by caller: we don't want to reveal whether this is | |
491 | * a decryption error or a MAC verification failure | |
492 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ | |
493 | return -1; | |
494 | } | |
495 | /* now i <= bs <= rec->length */ | |
496 | rec->length-=i; | |
497 | } | |
498 | } | |
499 | return(1); | |
500 | } | |
501 | ||
502 | void ssl3_init_finished_mac(SSL *s) | |
503 | { | |
504 | EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); | |
505 | EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); | |
506 | } | |
507 | ||
508 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) | |
509 | { | |
510 | EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); | |
511 | EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); | |
512 | } | |
513 | ||
514 | int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) | |
515 | { | |
516 | return(ssl3_handshake_mac(s,ctx,NULL,0,p)); | |
517 | } | |
518 | ||
519 | int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, | |
520 | const char *sender, int len, unsigned char *p) | |
521 | { | |
522 | int ret; | |
523 | ||
524 | ret=ssl3_handshake_mac(s,ctx1,sender,len,p); | |
525 | p+=ret; | |
526 | ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); | |
527 | return(ret); | |
528 | } | |
529 | ||
530 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, | |
531 | const char *sender, int len, unsigned char *p) | |
532 | { | |
533 | unsigned int ret; | |
534 | int npad,n; | |
535 | unsigned int i; | |
536 | unsigned char md_buf[EVP_MAX_MD_SIZE]; | |
537 | EVP_MD_CTX ctx; | |
538 | ||
539 | EVP_MD_CTX_init(&ctx); | |
540 | EVP_MD_CTX_copy_ex(&ctx,in_ctx); | |
541 | ||
542 | n=EVP_MD_CTX_size(&ctx); | |
543 | npad=(48/n)*n; | |
544 | ||
545 | if (sender != NULL) | |
546 | EVP_DigestUpdate(&ctx,sender,len); | |
547 | EVP_DigestUpdate(&ctx,s->session->master_key, | |
548 | s->session->master_key_length); | |
549 | EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); | |
550 | EVP_DigestFinal_ex(&ctx,md_buf,&i); | |
551 | ||
552 | EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); | |
553 | EVP_DigestUpdate(&ctx,s->session->master_key, | |
554 | s->session->master_key_length); | |
555 | EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); | |
556 | EVP_DigestUpdate(&ctx,md_buf,i); | |
557 | EVP_DigestFinal_ex(&ctx,p,&ret); | |
558 | ||
559 | EVP_MD_CTX_cleanup(&ctx); | |
560 | ||
561 | return((int)ret); | |
562 | } | |
563 | ||
564 | int ssl3_mac(SSL *ssl, unsigned char *md, int send) | |
565 | { | |
566 | SSL3_RECORD *rec; | |
567 | unsigned char *mac_sec,*seq; | |
568 | EVP_MD_CTX md_ctx; | |
569 | const EVP_MD *hash; | |
570 | unsigned char *p,rec_char; | |
571 | unsigned int md_size; | |
572 | int npad,i; | |
573 | ||
574 | if (send) | |
575 | { | |
576 | rec= &(ssl->s3->wrec); | |
577 | mac_sec= &(ssl->s3->write_mac_secret[0]); | |
578 | seq= &(ssl->s3->write_sequence[0]); | |
579 | hash=ssl->write_hash; | |
580 | } | |
581 | else | |
582 | { | |
583 | rec= &(ssl->s3->rrec); | |
584 | mac_sec= &(ssl->s3->read_mac_secret[0]); | |
585 | seq= &(ssl->s3->read_sequence[0]); | |
586 | hash=ssl->read_hash; | |
587 | } | |
588 | ||
589 | md_size=EVP_MD_size(hash); | |
590 | npad=(48/md_size)*md_size; | |
591 | ||
592 | /* Chop the digest off the end :-) */ | |
593 | EVP_MD_CTX_init(&md_ctx); | |
594 | ||
595 | EVP_DigestInit_ex( &md_ctx,hash, NULL); | |
596 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); | |
597 | EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); | |
598 | EVP_DigestUpdate(&md_ctx,seq,8); | |
599 | rec_char=rec->type; | |
600 | EVP_DigestUpdate(&md_ctx,&rec_char,1); | |
601 | p=md; | |
602 | s2n(rec->length,p); | |
603 | EVP_DigestUpdate(&md_ctx,md,2); | |
604 | EVP_DigestUpdate(&md_ctx,rec->input,rec->length); | |
605 | EVP_DigestFinal_ex( &md_ctx,md,NULL); | |
606 | ||
607 | EVP_DigestInit_ex( &md_ctx,hash, NULL); | |
608 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); | |
609 | EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); | |
610 | EVP_DigestUpdate(&md_ctx,md,md_size); | |
611 | EVP_DigestFinal_ex( &md_ctx,md,&md_size); | |
612 | ||
613 | EVP_MD_CTX_cleanup(&md_ctx); | |
614 | ||
615 | for (i=7; i>=0; i--) | |
616 | { | |
617 | ++seq[i]; | |
618 | if (seq[i] != 0) break; | |
619 | } | |
620 | ||
621 | return(md_size); | |
622 | } | |
623 | ||
624 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, | |
625 | int len) | |
626 | { | |
627 | static const unsigned char *salt[3]={ | |
628 | #ifndef CHARSET_EBCDIC | |
629 | (const unsigned char *)"A", | |
630 | (const unsigned char *)"BB", | |
631 | (const unsigned char *)"CCC", | |
632 | #else | |
633 | (const unsigned char *)"\x41", | |
634 | (const unsigned char *)"\x42\x42", | |
635 | (const unsigned char *)"\x43\x43\x43", | |
636 | #endif | |
637 | }; | |
638 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
639 | EVP_MD_CTX ctx; | |
640 | int i,ret=0; | |
641 | unsigned int n; | |
642 | ||
643 | EVP_MD_CTX_init(&ctx); | |
644 | for (i=0; i<3; i++) | |
645 | { | |
646 | EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); | |
647 | EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); | |
648 | EVP_DigestUpdate(&ctx,p,len); | |
649 | EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), | |
650 | SSL3_RANDOM_SIZE); | |
651 | EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), | |
652 | SSL3_RANDOM_SIZE); | |
653 | EVP_DigestFinal_ex(&ctx,buf,&n); | |
654 | ||
655 | EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); | |
656 | EVP_DigestUpdate(&ctx,p,len); | |
657 | EVP_DigestUpdate(&ctx,buf,n); | |
658 | EVP_DigestFinal_ex(&ctx,out,&n); | |
659 | out+=n; | |
660 | ret+=n; | |
661 | } | |
662 | EVP_MD_CTX_cleanup(&ctx); | |
663 | return(ret); | |
664 | } | |
665 | ||
666 | int ssl3_alert_code(int code) | |
667 | { | |
668 | switch (code) | |
669 | { | |
670 | case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); | |
671 | case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); | |
672 | case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); | |
673 | case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); | |
674 | case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); | |
675 | case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); | |
676 | case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
677 | case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); | |
678 | case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); | |
679 | case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); | |
680 | case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); | |
681 | case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); | |
682 | case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); | |
683 | case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); | |
684 | case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); | |
685 | case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); | |
686 | case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
687 | case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
688 | case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); | |
689 | case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); | |
690 | case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); | |
691 | case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
692 | case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); | |
693 | case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ | |
694 | default: return(-1); | |
695 | } | |
696 | } | |
697 |