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58964a49 RE |
1 | /* ssl/t1_lib.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 | #include <stdio.h> | |
ec577822 | 60 | #include <openssl/objects.h> |
865a90eb DSH |
61 | #include <openssl/evp.h> |
62 | #include <openssl/hmac.h> | |
a5232767 | 63 | #include <openssl/ocsp.h> |
58964a49 RE |
64 | #include "ssl_locl.h" |
65 | ||
4479ce9c | 66 | const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; |
58964a49 | 67 | |
865a90eb DSH |
68 | #ifndef OPENSSL_NO_TLSEXT |
69 | static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, | |
70 | const unsigned char *sess_id, int sesslen, | |
71 | SSL_SESSION **psess); | |
72 | #endif | |
73 | ||
222f2246 | 74 | SSL3_ENC_METHOD TLSv1_enc_data={ |
58964a49 RE |
75 | tls1_enc, |
76 | tls1_mac, | |
77 | tls1_setup_key_block, | |
78 | tls1_generate_master_secret, | |
79 | tls1_change_cipher_state, | |
80 | tls1_final_finish_mac, | |
81 | TLS1_FINISH_MAC_LENGTH, | |
82 | tls1_cert_verify_mac, | |
83 | TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
84 | TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, | |
85 | tls1_alert_code, | |
86 | }; | |
87 | ||
222f2246 | 88 | long tls1_default_timeout(void) |
58964a49 RE |
89 | { |
90 | /* 2 hours, the 24 hours mentioned in the TLSv1 spec | |
91 | * is way too long for http, the cache would over fill */ | |
92 | return(60*60*2); | |
93 | } | |
94 | ||
222f2246 DSH |
95 | IMPLEMENT_tls1_meth_func(tlsv1_base_method, |
96 | ssl_undefined_function, | |
97 | ssl_undefined_function, | |
98 | ssl_bad_method) | |
58964a49 | 99 | |
6b691a5c | 100 | int tls1_new(SSL *s) |
58964a49 RE |
101 | { |
102 | if (!ssl3_new(s)) return(0); | |
103 | s->method->ssl_clear(s); | |
104 | return(1); | |
105 | } | |
106 | ||
6b691a5c | 107 | void tls1_free(SSL *s) |
58964a49 RE |
108 | { |
109 | ssl3_free(s); | |
110 | } | |
111 | ||
6b691a5c | 112 | void tls1_clear(SSL *s) |
58964a49 RE |
113 | { |
114 | ssl3_clear(s); | |
115 | s->version=TLS1_VERSION; | |
116 | } | |
117 | ||
118 | #if 0 | |
6b691a5c | 119 | long tls1_ctrl(SSL *s, int cmd, long larg, char *parg) |
58964a49 RE |
120 | { |
121 | return(0); | |
122 | } | |
d3442bc7 RL |
123 | |
124 | long tls1_callback_ctrl(SSL *s, int cmd, void *(*fp)()) | |
125 | { | |
126 | return(0); | |
127 | } | |
58964a49 | 128 | #endif |
865a90eb DSH |
129 | |
130 | #ifndef OPENSSL_NO_TLSEXT | |
131 | unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) | |
132 | { | |
133 | int extdatalen=0; | |
134 | unsigned char *ret = p; | |
135 | ||
136 | ret+=2; | |
137 | ||
138 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
139 | ||
140 | if (s->tlsext_hostname != NULL) | |
141 | { | |
142 | /* Add TLS extension servername to the Client Hello message */ | |
143 | unsigned long size_str; | |
144 | long lenmax; | |
145 | ||
146 | /* check for enough space. | |
147 | 4 for the servername type and entension length | |
148 | 2 for servernamelist length | |
149 | 1 for the hostname type | |
150 | 2 for hostname length | |
151 | + hostname length | |
152 | */ | |
153 | ||
3bd1690b | 154 | if ((lenmax = limit - ret - 9) < 0 |
865a90eb DSH |
155 | || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) |
156 | return NULL; | |
157 | ||
158 | /* extension type and length */ | |
159 | s2n(TLSEXT_TYPE_server_name,ret); | |
160 | s2n(size_str+5,ret); | |
161 | ||
162 | /* length of servername list */ | |
163 | s2n(size_str+3,ret); | |
164 | ||
165 | /* hostname type, length and hostname */ | |
166 | *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; | |
167 | s2n(size_str,ret); | |
168 | memcpy(ret, s->tlsext_hostname, size_str); | |
169 | ret+=size_str; | |
170 | ||
171 | } | |
172 | ||
173 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
174 | { | |
175 | int ticklen; | |
176 | if (s->session && s->session->tlsext_tick) | |
177 | ticklen = s->session->tlsext_ticklen; | |
178 | else | |
179 | ticklen = 0; | |
180 | /* Check for enough room 2 for extension type, 2 for len | |
181 | * rest for ticket | |
182 | */ | |
3bd1690b | 183 | if (limit - ret - 4 - ticklen < 0) |
865a90eb DSH |
184 | return NULL; |
185 | s2n(TLSEXT_TYPE_session_ticket,ret); | |
186 | s2n(ticklen,ret); | |
187 | if (ticklen) | |
188 | { | |
189 | memcpy(ret, s->session->tlsext_tick, ticklen); | |
190 | ret += ticklen; | |
191 | } | |
192 | } | |
193 | ||
a5232767 DSH |
194 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) |
195 | { | |
196 | int i; | |
197 | long extlen, idlen, itmp; | |
198 | OCSP_RESPID *id; | |
199 | ||
200 | idlen = 0; | |
201 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
202 | { | |
203 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
204 | itmp = i2d_OCSP_RESPID(id, NULL); | |
205 | if (itmp <= 0) | |
206 | return NULL; | |
207 | idlen += itmp + 2; | |
208 | } | |
209 | ||
210 | if (s->tlsext_ocsp_exts) | |
211 | { | |
212 | extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
213 | if (extlen < 0) | |
214 | return NULL; | |
215 | } | |
216 | else | |
217 | extlen = 0; | |
218 | ||
219 | if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; | |
220 | s2n(TLSEXT_TYPE_status_request, ret); | |
221 | if (extlen + idlen > 0xFFF0) | |
222 | return NULL; | |
223 | s2n(extlen + idlen + 5, ret); | |
224 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
225 | s2n(idlen, ret); | |
226 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
227 | { | |
228 | /* save position of id len */ | |
229 | unsigned char *q = ret; | |
230 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
231 | /* skip over id len */ | |
232 | ret += 2; | |
233 | itmp = i2d_OCSP_RESPID(id, &ret); | |
234 | /* write id len */ | |
235 | s2n(itmp, q); | |
236 | } | |
237 | s2n(extlen, ret); | |
238 | if (extlen > 0) | |
239 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
240 | } | |
241 | ||
865a90eb DSH |
242 | if ((extdatalen = ret-p-2)== 0) |
243 | return p; | |
244 | ||
245 | s2n(extdatalen,p); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) | |
250 | { | |
251 | int extdatalen=0; | |
252 | unsigned char *ret = p; | |
253 | ||
254 | ret+=2; | |
255 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
256 | ||
257 | if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) | |
258 | { | |
4ab0088b | 259 | if (limit - ret - 4 < 0) return NULL; |
865a90eb DSH |
260 | |
261 | s2n(TLSEXT_TYPE_server_name,ret); | |
262 | s2n(0,ret); | |
263 | } | |
264 | ||
265 | if (s->tlsext_ticket_expected | |
266 | && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
267 | { | |
4ab0088b | 268 | if (limit - ret - 4 < 0) return NULL; |
865a90eb DSH |
269 | s2n(TLSEXT_TYPE_session_ticket,ret); |
270 | s2n(0,ret); | |
271 | } | |
a5232767 DSH |
272 | |
273 | if (s->tlsext_status_expected) | |
274 | { | |
275 | if ((long)(limit - ret - 4) < 0) return NULL; | |
276 | s2n(TLSEXT_TYPE_status_request,ret); | |
277 | s2n(0,ret); | |
278 | } | |
279 | ||
865a90eb DSH |
280 | if ((extdatalen = ret-p-2)== 0) |
281 | return p; | |
282 | ||
283 | s2n(extdatalen,p); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) | |
288 | { | |
289 | unsigned short type; | |
290 | unsigned short size; | |
291 | unsigned short len; | |
292 | unsigned char *data = *p; | |
293 | s->servername_done = 0; | |
a5232767 | 294 | s->tlsext_status_type = -1; |
865a90eb DSH |
295 | |
296 | if (data >= (d+n-2)) | |
297 | return 1; | |
298 | n2s(data,len); | |
299 | ||
300 | if (data > (d+n-len)) | |
301 | return 1; | |
302 | ||
303 | while (data <= (d+n-4)) | |
304 | { | |
305 | n2s(data,type); | |
306 | n2s(data,size); | |
307 | ||
308 | if (data+size > (d+n)) | |
309 | return 1; | |
310 | ||
311 | if (s->tlsext_debug_cb) | |
312 | s->tlsext_debug_cb(s, 0, type, data, size, | |
313 | s->tlsext_debug_arg); | |
314 | /* The servername extension is treated as follows: | |
315 | ||
316 | - Only the hostname type is supported with a maximum length of 255. | |
317 | - The servername is rejected if too long or if it contains zeros, | |
318 | in which case an fatal alert is generated. | |
319 | - The servername field is maintained together with the session cache. | |
320 | - When a session is resumed, the servername call back invoked in order | |
321 | to allow the application to position itself to the right context. | |
322 | - The servername is acknowledged if it is new for a session or when | |
323 | it is identical to a previously used for the same session. | |
324 | Applications can control the behaviour. They can at any time | |
325 | set a 'desirable' servername for a new SSL object. This can be the | |
326 | case for example with HTTPS when a Host: header field is received and | |
327 | a renegotiation is requested. In this case, a possible servername | |
328 | presented in the new client hello is only acknowledged if it matches | |
329 | the value of the Host: field. | |
330 | - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | |
331 | if they provide for changing an explicit servername context for the session, | |
332 | i.e. when the session has been established with a servername extension. | |
333 | - On session reconnect, the servername extension may be absent. | |
334 | ||
335 | */ | |
336 | ||
337 | if (type == TLSEXT_TYPE_server_name) | |
338 | { | |
339 | unsigned char *sdata; | |
340 | int servname_type; | |
341 | int dsize; | |
342 | ||
343 | if (size < 2) | |
344 | { | |
345 | *al = SSL_AD_DECODE_ERROR; | |
346 | return 0; | |
347 | } | |
348 | n2s(data,dsize); | |
349 | size -= 2; | |
350 | if (dsize > size ) | |
351 | { | |
352 | *al = SSL_AD_DECODE_ERROR; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | sdata = data; | |
357 | while (dsize > 3) | |
358 | { | |
359 | servname_type = *(sdata++); | |
360 | n2s(sdata,len); | |
361 | dsize -= 3; | |
362 | ||
363 | if (len > dsize) | |
364 | { | |
365 | *al = SSL_AD_DECODE_ERROR; | |
366 | return 0; | |
367 | } | |
368 | if (s->servername_done == 0) | |
369 | switch (servname_type) | |
370 | { | |
371 | case TLSEXT_NAMETYPE_host_name: | |
372 | if (s->session->tlsext_hostname == NULL) | |
373 | { | |
374 | if (len > TLSEXT_MAXLEN_host_name || | |
375 | ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)) | |
376 | { | |
377 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
378 | return 0; | |
379 | } | |
380 | memcpy(s->session->tlsext_hostname, sdata, len); | |
381 | s->session->tlsext_hostname[len]='\0'; | |
382 | if (strlen(s->session->tlsext_hostname) != len) { | |
383 | OPENSSL_free(s->session->tlsext_hostname); | |
d3b3a6d3 | 384 | s->session->tlsext_hostname = NULL; |
865a90eb DSH |
385 | *al = TLS1_AD_UNRECOGNIZED_NAME; |
386 | return 0; | |
387 | } | |
388 | s->servername_done = 1; | |
389 | ||
390 | } | |
391 | else | |
392 | s->servername_done = strlen(s->session->tlsext_hostname) == len | |
393 | && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; | |
394 | ||
395 | break; | |
396 | ||
397 | default: | |
398 | break; | |
399 | } | |
400 | ||
401 | dsize -= len; | |
402 | } | |
403 | if (dsize != 0) | |
404 | { | |
405 | *al = SSL_AD_DECODE_ERROR; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | } | |
a5232767 DSH |
410 | else if (type == TLSEXT_TYPE_status_request |
411 | && s->ctx->tlsext_status_cb) | |
412 | { | |
413 | ||
414 | if (size < 5) | |
415 | { | |
416 | *al = SSL_AD_DECODE_ERROR; | |
417 | return 0; | |
418 | } | |
419 | ||
420 | s->tlsext_status_type = *data++; | |
421 | size--; | |
422 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) | |
423 | { | |
424 | const unsigned char *sdata; | |
425 | int dsize; | |
426 | /* Read in responder_id_list */ | |
427 | n2s(data,dsize); | |
428 | size -= 2; | |
429 | if (dsize > size ) | |
430 | { | |
431 | *al = SSL_AD_DECODE_ERROR; | |
432 | return 0; | |
433 | } | |
434 | while (dsize > 0) | |
435 | { | |
436 | OCSP_RESPID *id; | |
437 | int idsize; | |
438 | if (dsize < 4) | |
439 | { | |
440 | *al = SSL_AD_DECODE_ERROR; | |
441 | return 0; | |
442 | } | |
443 | n2s(data, idsize); | |
444 | dsize -= 2 + idsize; | |
445 | if (dsize < 0) | |
446 | { | |
447 | *al = SSL_AD_DECODE_ERROR; | |
448 | return 0; | |
449 | } | |
450 | sdata = data; | |
451 | data += idsize; | |
452 | id = d2i_OCSP_RESPID(NULL, | |
453 | &sdata, idsize); | |
454 | if (!id) | |
455 | { | |
456 | *al = SSL_AD_DECODE_ERROR; | |
457 | return 0; | |
458 | } | |
459 | if (data != sdata) | |
460 | { | |
461 | OCSP_RESPID_free(id); | |
462 | *al = SSL_AD_DECODE_ERROR; | |
463 | return 0; | |
464 | } | |
465 | if (!s->tlsext_ocsp_ids | |
466 | && !(s->tlsext_ocsp_ids = | |
467 | sk_OCSP_RESPID_new_null())) | |
468 | { | |
469 | OCSP_RESPID_free(id); | |
470 | *al = SSL_AD_INTERNAL_ERROR; | |
471 | return 0; | |
472 | } | |
473 | if (!sk_OCSP_RESPID_push( | |
474 | s->tlsext_ocsp_ids, id)) | |
475 | { | |
476 | OCSP_RESPID_free(id); | |
477 | *al = SSL_AD_INTERNAL_ERROR; | |
478 | return 0; | |
479 | } | |
480 | } | |
481 | ||
482 | /* Read in request_extensions */ | |
483 | n2s(data,dsize); | |
484 | size -= 2; | |
485 | if (dsize > size) | |
486 | { | |
487 | *al = SSL_AD_DECODE_ERROR; | |
488 | return 0; | |
489 | } | |
490 | sdata = data; | |
491 | if (dsize > 0) | |
492 | { | |
493 | s->tlsext_ocsp_exts = | |
494 | d2i_X509_EXTENSIONS(NULL, | |
495 | &sdata, dsize); | |
496 | if (!s->tlsext_ocsp_exts | |
497 | || (data + dsize != sdata)) | |
498 | { | |
499 | *al = SSL_AD_DECODE_ERROR; | |
500 | return 0; | |
501 | } | |
502 | } | |
503 | } | |
504 | /* We don't know what to do with any other type | |
505 | * so ignore it. | |
506 | */ | |
507 | else | |
508 | s->tlsext_status_type = -1; | |
509 | } | |
865a90eb DSH |
510 | /* session ticket processed earlier */ |
511 | ||
512 | data+=size; | |
513 | } | |
514 | ||
515 | *p = data; | |
516 | return 1; | |
517 | } | |
518 | ||
519 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) | |
520 | { | |
521 | unsigned short type; | |
522 | unsigned short size; | |
523 | unsigned short len; | |
524 | unsigned char *data = *p; | |
525 | ||
526 | int tlsext_servername = 0; | |
527 | ||
528 | if (data >= (d+n-2)) | |
529 | return 1; | |
530 | ||
531 | n2s(data,len); | |
532 | ||
533 | while(data <= (d+n-4)) | |
534 | { | |
535 | n2s(data,type); | |
536 | n2s(data,size); | |
537 | ||
538 | if (data+size > (d+n)) | |
539 | return 1; | |
540 | ||
541 | if (s->tlsext_debug_cb) | |
542 | s->tlsext_debug_cb(s, 1, type, data, size, | |
543 | s->tlsext_debug_arg); | |
544 | ||
545 | if (type == TLSEXT_TYPE_server_name) | |
546 | { | |
547 | if (s->tlsext_hostname == NULL || size > 0) | |
548 | { | |
549 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
550 | return 0; | |
551 | } | |
552 | tlsext_servername = 1; | |
553 | } | |
554 | else if (type == TLSEXT_TYPE_session_ticket) | |
555 | { | |
556 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) | |
557 | || (size > 0)) | |
558 | { | |
559 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
560 | return 0; | |
561 | } | |
562 | s->tlsext_ticket_expected = 1; | |
563 | } | |
a5232767 DSH |
564 | else if (type == TLSEXT_TYPE_status_request) |
565 | { | |
566 | /* MUST be empty and only sent if we've requested | |
567 | * a status request message. | |
568 | */ | |
569 | if ((s->tlsext_status_type == -1) || (size > 0)) | |
570 | { | |
571 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
572 | return 0; | |
573 | } | |
574 | /* Set flag to expect CertificateStatus message */ | |
575 | s->tlsext_status_expected = 1; | |
576 | } | |
865a90eb DSH |
577 | |
578 | data+=size; | |
579 | } | |
580 | ||
581 | if (data != d+n) | |
582 | { | |
583 | *al = SSL_AD_DECODE_ERROR; | |
584 | return 0; | |
585 | } | |
586 | ||
587 | if (!s->hit && tlsext_servername == 1) | |
588 | { | |
589 | if (s->tlsext_hostname) | |
590 | { | |
591 | if (s->session->tlsext_hostname == NULL) | |
592 | { | |
593 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); | |
594 | if (!s->session->tlsext_hostname) | |
595 | { | |
596 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
597 | return 0; | |
598 | } | |
599 | } | |
600 | else | |
601 | { | |
602 | *al = SSL_AD_DECODE_ERROR; | |
603 | return 0; | |
604 | } | |
605 | } | |
606 | } | |
607 | ||
608 | *p = data; | |
609 | return 1; | |
610 | } | |
611 | ||
612 | int ssl_check_clienthello_tlsext(SSL *s) | |
613 | { | |
614 | int ret=SSL_TLSEXT_ERR_NOACK; | |
615 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
616 | ||
617 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
618 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
619 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
620 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
621 | ||
a5232767 DSH |
622 | /* If status request then ask callback what to do. |
623 | * Note: this must be called after servername callbacks in case | |
624 | * the certificate has changed. | |
625 | */ | |
626 | if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb) | |
627 | { | |
628 | int r; | |
629 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
630 | switch (r) | |
631 | { | |
632 | /* We don't want to send a status request response */ | |
633 | case SSL_TLSEXT_ERR_NOACK: | |
634 | s->tlsext_status_expected = 0; | |
635 | break; | |
636 | /* status request response should be sent */ | |
637 | case SSL_TLSEXT_ERR_OK: | |
638 | if (s->tlsext_ocsp_resp) | |
639 | s->tlsext_status_expected = 1; | |
640 | else | |
641 | s->tlsext_status_expected = 0; | |
642 | break; | |
643 | /* something bad happened */ | |
644 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
645 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
646 | al = SSL_AD_INTERNAL_ERROR; | |
647 | goto err; | |
648 | } | |
649 | } | |
650 | else | |
651 | s->tlsext_status_expected = 0; | |
652 | err: | |
865a90eb DSH |
653 | switch (ret) |
654 | { | |
655 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
656 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
657 | return -1; | |
658 | ||
659 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
660 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
661 | return 1; | |
662 | ||
663 | case SSL_TLSEXT_ERR_NOACK: | |
664 | s->servername_done=0; | |
665 | default: | |
666 | return 1; | |
667 | } | |
668 | } | |
669 | ||
670 | int ssl_check_serverhello_tlsext(SSL *s) | |
671 | { | |
672 | int ret=SSL_TLSEXT_ERR_NOACK; | |
673 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
674 | ||
675 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
676 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
677 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
678 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
679 | ||
a5232767 DSH |
680 | /* If we've requested certificate status and we wont get one |
681 | * tell the callback | |
682 | */ | |
683 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
684 | && s->ctx->tlsext_status_cb) | |
685 | { | |
686 | int r; | |
687 | /* Set resp to NULL, resplen to -1 so callback knows | |
688 | * there is no response. | |
689 | */ | |
690 | if (s->tlsext_ocsp_resp) | |
691 | { | |
692 | OPENSSL_free(s->tlsext_ocsp_resp); | |
693 | s->tlsext_ocsp_resp = NULL; | |
694 | } | |
695 | s->tlsext_ocsp_resplen = -1; | |
696 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
697 | if (r == 0) | |
698 | { | |
699 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
700 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
701 | } | |
702 | if (r < 0) | |
703 | { | |
704 | al = SSL_AD_INTERNAL_ERROR; | |
705 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
706 | } | |
707 | } | |
708 | ||
865a90eb DSH |
709 | switch (ret) |
710 | { | |
711 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
712 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
713 | return -1; | |
714 | ||
715 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
716 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
717 | return 1; | |
718 | ||
719 | case SSL_TLSEXT_ERR_NOACK: | |
720 | s->servername_done=0; | |
721 | default: | |
722 | return 1; | |
723 | } | |
724 | } | |
725 | ||
726 | /* Since the server cache lookup is done early on in the processing of client | |
727 | * hello and other operations depend on the result we need to handle any TLS | |
728 | * session ticket extension at the same time. | |
729 | */ | |
730 | ||
731 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, | |
732 | const unsigned char *limit, SSL_SESSION **ret) | |
733 | { | |
734 | /* Point after session ID in client hello */ | |
735 | const unsigned char *p = session_id + len; | |
736 | unsigned short i; | |
8f59c61d DSH |
737 | |
738 | /* If tickets disabled behave as if no ticket present | |
739 | * to permit stateful resumption. | |
740 | */ | |
741 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) | |
742 | return 1; | |
743 | ||
865a90eb DSH |
744 | if ((s->version <= SSL3_VERSION) || !limit) |
745 | return 1; | |
746 | if (p >= limit) | |
747 | return -1; | |
748 | /* Skip past cipher list */ | |
749 | n2s(p, i); | |
750 | p+= i; | |
751 | if (p >= limit) | |
752 | return -1; | |
753 | /* Skip past compression algorithm list */ | |
754 | i = *(p++); | |
755 | p += i; | |
756 | if (p > limit) | |
757 | return -1; | |
758 | /* Now at start of extensions */ | |
759 | if ((p + 2) >= limit) | |
760 | return 1; | |
761 | n2s(p, i); | |
762 | while ((p + 4) <= limit) | |
763 | { | |
764 | unsigned short type, size; | |
765 | n2s(p, type); | |
766 | n2s(p, size); | |
767 | if (p + size > limit) | |
768 | return 1; | |
769 | if (type == TLSEXT_TYPE_session_ticket) | |
770 | { | |
8f59c61d | 771 | /* If zero length note client will accept a ticket |
865a90eb DSH |
772 | * and indicate cache miss to trigger full handshake |
773 | */ | |
774 | if (size == 0) | |
775 | { | |
776 | s->tlsext_ticket_expected = 1; | |
777 | return 0; /* Cache miss */ | |
778 | } | |
779 | return tls_decrypt_ticket(s, p, size, session_id, len, | |
780 | ret); | |
781 | } | |
782 | p += size; | |
783 | } | |
784 | return 1; | |
785 | } | |
786 | ||
787 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, | |
788 | const unsigned char *sess_id, int sesslen, | |
789 | SSL_SESSION **psess) | |
790 | { | |
791 | SSL_SESSION *sess; | |
792 | unsigned char *sdec; | |
793 | const unsigned char *p; | |
db533c96 | 794 | int slen, mlen, renew_ticket = 0; |
865a90eb DSH |
795 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; |
796 | HMAC_CTX hctx; | |
797 | EVP_CIPHER_CTX ctx; | |
db533c96 DSH |
798 | /* Need at least keyname + iv + some encrypted data */ |
799 | if (eticklen < 48) | |
800 | goto tickerr; | |
801 | /* Initialize session ticket encryption and HMAC contexts */ | |
802 | HMAC_CTX_init(&hctx); | |
803 | EVP_CIPHER_CTX_init(&ctx); | |
804 | if (s->ctx->tlsext_ticket_key_cb) | |
805 | { | |
806 | unsigned char *nctick = (unsigned char *)etick; | |
807 | int rv = s->ctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, | |
808 | &ctx, &hctx, 0); | |
809 | if (rv < 0) | |
810 | return -1; | |
811 | if (rv == 0) | |
812 | goto tickerr; | |
813 | if (rv == 2) | |
814 | renew_ticket = 1; | |
815 | } | |
816 | else | |
817 | { | |
818 | /* Check key name matches */ | |
819 | if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16)) | |
820 | goto tickerr; | |
821 | HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16, | |
822 | tlsext_tick_md(), NULL); | |
823 | EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
824 | s->ctx->tlsext_tick_aes_key, etick + 16); | |
825 | } | |
865a90eb DSH |
826 | /* Attempt to process session ticket, first conduct sanity and |
827 | * integrity checks on ticket. | |
828 | */ | |
db533c96 | 829 | mlen = HMAC_size(&hctx); |
865a90eb | 830 | eticklen -= mlen; |
865a90eb | 831 | /* Check HMAC of encrypted ticket */ |
865a90eb DSH |
832 | HMAC_Update(&hctx, etick, eticklen); |
833 | HMAC_Final(&hctx, tick_hmac, NULL); | |
834 | HMAC_CTX_cleanup(&hctx); | |
835 | if (memcmp(tick_hmac, etick + eticklen, mlen)) | |
836 | goto tickerr; | |
865a90eb | 837 | /* Attempt to decrypt session data */ |
865a90eb | 838 | /* Move p after IV to start of encrypted ticket, update length */ |
db533c96 DSH |
839 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); |
840 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
865a90eb DSH |
841 | sdec = OPENSSL_malloc(eticklen); |
842 | if (!sdec) | |
843 | { | |
844 | EVP_CIPHER_CTX_cleanup(&ctx); | |
845 | return -1; | |
846 | } | |
847 | EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); | |
848 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) | |
849 | goto tickerr; | |
850 | slen += mlen; | |
851 | EVP_CIPHER_CTX_cleanup(&ctx); | |
852 | p = sdec; | |
853 | ||
854 | sess = d2i_SSL_SESSION(NULL, &p, slen); | |
855 | OPENSSL_free(sdec); | |
856 | if (sess) | |
857 | { | |
858 | /* The session ID if non-empty is used by some clients to | |
859 | * detect that the ticket has been accepted. So we copy it to | |
860 | * the session structure. If it is empty set length to zero | |
861 | * as required by standard. | |
862 | */ | |
863 | if (sesslen) | |
864 | memcpy(sess->session_id, sess_id, sesslen); | |
865 | sess->session_id_length = sesslen; | |
866 | *psess = sess; | |
db533c96 | 867 | s->tlsext_ticket_expected = renew_ticket; |
865a90eb DSH |
868 | return 1; |
869 | } | |
870 | /* If session decrypt failure indicate a cache miss and set state to | |
871 | * send a new ticket | |
872 | */ | |
873 | tickerr: | |
874 | s->tlsext_ticket_expected = 1; | |
875 | return 0; | |
876 | } | |
877 | ||
878 | #endif |