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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 | ||
7a014dce DSH |
136 | /* don't add extensions for SSLv3 unless doing secure renegotiation */ |
137 | if (s->client_version == SSL3_VERSION | |
138 | && !s->s3->send_connection_binding) | |
5d577d7e DSH |
139 | return p; |
140 | ||
865a90eb DSH |
141 | ret+=2; |
142 | ||
143 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
144 | ||
145 | if (s->tlsext_hostname != NULL) | |
146 | { | |
147 | /* Add TLS extension servername to the Client Hello message */ | |
148 | unsigned long size_str; | |
149 | long lenmax; | |
150 | ||
151 | /* check for enough space. | |
152 | 4 for the servername type and entension length | |
153 | 2 for servernamelist length | |
154 | 1 for the hostname type | |
155 | 2 for hostname length | |
156 | + hostname length | |
157 | */ | |
158 | ||
3bd1690b | 159 | if ((lenmax = limit - ret - 9) < 0 |
865a90eb DSH |
160 | || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) |
161 | return NULL; | |
162 | ||
163 | /* extension type and length */ | |
164 | s2n(TLSEXT_TYPE_server_name,ret); | |
165 | s2n(size_str+5,ret); | |
166 | ||
167 | /* length of servername list */ | |
168 | s2n(size_str+3,ret); | |
169 | ||
170 | /* hostname type, length and hostname */ | |
171 | *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; | |
172 | s2n(size_str,ret); | |
173 | memcpy(ret, s->tlsext_hostname, size_str); | |
174 | ret+=size_str; | |
175 | ||
176 | } | |
3798a4d0 DSH |
177 | |
178 | /* Add RI if renegotiating */ | |
179 | if (s->new_session) | |
180 | { | |
c2b78c31 BL |
181 | int el; |
182 | ||
183 | if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) | |
184 | { | |
185 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
186 | return NULL; | |
187 | } | |
188 | ||
189 | if((limit - p - 4 - el) < 0) return NULL; | |
190 | ||
191 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
192 | s2n(el,ret); | |
193 | ||
194 | if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) | |
195 | { | |
196 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | ret += el; | |
201 | } | |
202 | ||
203 | ||
865a90eb DSH |
204 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) |
205 | { | |
206 | int ticklen; | |
a1dc0336 | 207 | if (!s->new_session && s->session && s->session->tlsext_tick) |
865a90eb DSH |
208 | ticklen = s->session->tlsext_ticklen; |
209 | else | |
210 | ticklen = 0; | |
211 | /* Check for enough room 2 for extension type, 2 for len | |
212 | * rest for ticket | |
213 | */ | |
3bd1690b | 214 | if (limit - ret - 4 - ticklen < 0) |
865a90eb DSH |
215 | return NULL; |
216 | s2n(TLSEXT_TYPE_session_ticket,ret); | |
217 | s2n(ticklen,ret); | |
218 | if (ticklen) | |
219 | { | |
220 | memcpy(ret, s->session->tlsext_tick, ticklen); | |
221 | ret += ticklen; | |
222 | } | |
223 | } | |
224 | ||
7a014dce DSH |
225 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && |
226 | s->version != DTLS1_VERSION) | |
a5232767 DSH |
227 | { |
228 | int i; | |
229 | long extlen, idlen, itmp; | |
230 | OCSP_RESPID *id; | |
231 | ||
232 | idlen = 0; | |
233 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
234 | { | |
235 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
236 | itmp = i2d_OCSP_RESPID(id, NULL); | |
237 | if (itmp <= 0) | |
238 | return NULL; | |
239 | idlen += itmp + 2; | |
240 | } | |
241 | ||
242 | if (s->tlsext_ocsp_exts) | |
243 | { | |
244 | extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
245 | if (extlen < 0) | |
246 | return NULL; | |
247 | } | |
248 | else | |
249 | extlen = 0; | |
250 | ||
251 | if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; | |
252 | s2n(TLSEXT_TYPE_status_request, ret); | |
253 | if (extlen + idlen > 0xFFF0) | |
254 | return NULL; | |
255 | s2n(extlen + idlen + 5, ret); | |
256 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
257 | s2n(idlen, ret); | |
258 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
259 | { | |
260 | /* save position of id len */ | |
261 | unsigned char *q = ret; | |
262 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
263 | /* skip over id len */ | |
264 | ret += 2; | |
265 | itmp = i2d_OCSP_RESPID(id, &ret); | |
266 | /* write id len */ | |
267 | s2n(itmp, q); | |
268 | } | |
269 | s2n(extlen, ret); | |
270 | if (extlen > 0) | |
271 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
272 | } | |
273 | ||
865a90eb DSH |
274 | if ((extdatalen = ret-p-2)== 0) |
275 | return p; | |
276 | ||
277 | s2n(extdatalen,p); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) | |
282 | { | |
283 | int extdatalen=0; | |
284 | unsigned char *ret = p; | |
285 | ||
7a014dce DSH |
286 | /* don't add extensions for SSLv3, unless doing secure renegotiation */ |
287 | if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) | |
5d577d7e DSH |
288 | return p; |
289 | ||
865a90eb DSH |
290 | ret+=2; |
291 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
292 | ||
293 | if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) | |
294 | { | |
4ab0088b | 295 | if (limit - ret - 4 < 0) return NULL; |
865a90eb DSH |
296 | |
297 | s2n(TLSEXT_TYPE_server_name,ret); | |
298 | s2n(0,ret); | |
299 | } | |
c2b78c31 | 300 | |
7a014dce | 301 | if(s->s3->send_connection_binding) |
c2b78c31 BL |
302 | { |
303 | int el; | |
304 | ||
305 | if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) | |
306 | { | |
af13c50d | 307 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
c2b78c31 BL |
308 | return NULL; |
309 | } | |
310 | ||
311 | if((limit - p - 4 - el) < 0) return NULL; | |
312 | ||
313 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
314 | s2n(el,ret); | |
315 | ||
316 | if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) | |
317 | { | |
af13c50d | 318 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
c2b78c31 BL |
319 | return NULL; |
320 | } | |
321 | ||
322 | ret += el; | |
323 | } | |
865a90eb DSH |
324 | |
325 | if (s->tlsext_ticket_expected | |
326 | && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
327 | { | |
4ab0088b | 328 | if (limit - ret - 4 < 0) return NULL; |
865a90eb DSH |
329 | s2n(TLSEXT_TYPE_session_ticket,ret); |
330 | s2n(0,ret); | |
331 | } | |
a5232767 DSH |
332 | |
333 | if (s->tlsext_status_expected) | |
334 | { | |
335 | if ((long)(limit - ret - 4) < 0) return NULL; | |
336 | s2n(TLSEXT_TYPE_status_request,ret); | |
337 | s2n(0,ret); | |
338 | } | |
339 | ||
865a90eb DSH |
340 | if ((extdatalen = ret-p-2)== 0) |
341 | return p; | |
342 | ||
343 | s2n(extdatalen,p); | |
344 | return ret; | |
345 | } | |
346 | ||
cadbbd51 RS |
347 | #ifndef OPENSSL_NO_EC |
348 | /* ssl_check_for_safari attempts to fingerprint Safari using OS X | |
349 | * SecureTransport using the TLS extension block in |d|, of length |n|. | |
350 | * Safari, since 10.6, sends exactly these extensions, in this order: | |
351 | * SNI, | |
352 | * elliptic_curves | |
353 | * ec_point_formats | |
354 | * | |
355 | * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8, | |
356 | * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them. | |
357 | * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from | |
358 | * 10.8..10.8.3 (which don't work). | |
359 | */ | |
360 | static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) { | |
361 | unsigned short type, size; | |
362 | static const unsigned char kSafariExtensionsBlock[] = { | |
363 | 0x00, 0x0a, /* elliptic_curves extension */ | |
364 | 0x00, 0x08, /* 8 bytes */ | |
365 | 0x00, 0x06, /* 6 bytes of curve ids */ | |
366 | 0x00, 0x17, /* P-256 */ | |
367 | 0x00, 0x18, /* P-384 */ | |
368 | 0x00, 0x19, /* P-521 */ | |
369 | ||
370 | 0x00, 0x0b, /* ec_point_formats */ | |
371 | 0x00, 0x02, /* 2 bytes */ | |
372 | 0x01, /* 1 point format */ | |
373 | 0x00, /* uncompressed */ | |
374 | }; | |
375 | ||
376 | /* The following is only present in TLS 1.2 */ | |
377 | static const unsigned char kSafariTLS12ExtensionsBlock[] = { | |
378 | 0x00, 0x0d, /* signature_algorithms */ | |
379 | 0x00, 0x0c, /* 12 bytes */ | |
380 | 0x00, 0x0a, /* 10 bytes */ | |
381 | 0x05, 0x01, /* SHA-384/RSA */ | |
382 | 0x04, 0x01, /* SHA-256/RSA */ | |
383 | 0x02, 0x01, /* SHA-1/RSA */ | |
384 | 0x04, 0x03, /* SHA-256/ECDSA */ | |
385 | 0x02, 0x03, /* SHA-1/ECDSA */ | |
386 | }; | |
387 | ||
388 | if (data >= (d+n-2)) | |
389 | return; | |
390 | data += 2; | |
391 | ||
392 | if (data > (d+n-4)) | |
393 | return; | |
394 | n2s(data,type); | |
395 | n2s(data,size); | |
396 | ||
397 | if (type != TLSEXT_TYPE_server_name) | |
398 | return; | |
399 | ||
400 | if (data+size > d+n) | |
401 | return; | |
402 | data += size; | |
403 | ||
43433b38 | 404 | if (TLS1_get_client_version(s) >= TLS1_2_VERSION) |
cadbbd51 RS |
405 | { |
406 | const size_t len1 = sizeof(kSafariExtensionsBlock); | |
407 | const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock); | |
408 | ||
409 | if (data + len1 + len2 != d+n) | |
410 | return; | |
411 | if (memcmp(data, kSafariExtensionsBlock, len1) != 0) | |
412 | return; | |
413 | if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0) | |
414 | return; | |
415 | } | |
416 | else | |
417 | { | |
418 | const size_t len = sizeof(kSafariExtensionsBlock); | |
419 | ||
420 | if (data + len != d+n) | |
421 | return; | |
422 | if (memcmp(data, kSafariExtensionsBlock, len) != 0) | |
423 | return; | |
424 | } | |
425 | ||
426 | s->s3->is_probably_safari = 1; | |
427 | } | |
a4bfeff2 | 428 | #endif /* !OPENSSL_NO_EC */ |
cadbbd51 | 429 | |
865a90eb DSH |
430 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
431 | { | |
432 | unsigned short type; | |
433 | unsigned short size; | |
434 | unsigned short len; | |
435 | unsigned char *data = *p; | |
c2b78c31 BL |
436 | int renegotiate_seen = 0; |
437 | ||
865a90eb | 438 | s->servername_done = 0; |
a5232767 | 439 | s->tlsext_status_type = -1; |
865a90eb | 440 | |
cadbbd51 RS |
441 | #ifndef OPENSSL_NO_EC |
442 | if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG) | |
443 | ssl_check_for_safari(s, data, d, n); | |
a4bfeff2 | 444 | #endif /* !OPENSSL_NO_EC */ |
cadbbd51 | 445 | |
865a90eb | 446 | if (data >= (d+n-2)) |
efbe446f DSH |
447 | goto ri_check; |
448 | ||
865a90eb DSH |
449 | n2s(data,len); |
450 | ||
451 | if (data > (d+n-len)) | |
efbe446f | 452 | goto ri_check; |
865a90eb DSH |
453 | |
454 | while (data <= (d+n-4)) | |
455 | { | |
456 | n2s(data,type); | |
457 | n2s(data,size); | |
458 | ||
459 | if (data+size > (d+n)) | |
593a6dbe | 460 | goto ri_check; |
865a90eb DSH |
461 | |
462 | if (s->tlsext_debug_cb) | |
463 | s->tlsext_debug_cb(s, 0, type, data, size, | |
464 | s->tlsext_debug_arg); | |
465 | /* The servername extension is treated as follows: | |
466 | ||
467 | - Only the hostname type is supported with a maximum length of 255. | |
468 | - The servername is rejected if too long or if it contains zeros, | |
469 | in which case an fatal alert is generated. | |
470 | - The servername field is maintained together with the session cache. | |
471 | - When a session is resumed, the servername call back invoked in order | |
472 | to allow the application to position itself to the right context. | |
473 | - The servername is acknowledged if it is new for a session or when | |
474 | it is identical to a previously used for the same session. | |
475 | Applications can control the behaviour. They can at any time | |
476 | set a 'desirable' servername for a new SSL object. This can be the | |
477 | case for example with HTTPS when a Host: header field is received and | |
478 | a renegotiation is requested. In this case, a possible servername | |
479 | presented in the new client hello is only acknowledged if it matches | |
480 | the value of the Host: field. | |
481 | - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | |
482 | if they provide for changing an explicit servername context for the session, | |
483 | i.e. when the session has been established with a servername extension. | |
484 | - On session reconnect, the servername extension may be absent. | |
485 | ||
486 | */ | |
487 | ||
488 | if (type == TLSEXT_TYPE_server_name) | |
489 | { | |
490 | unsigned char *sdata; | |
491 | int servname_type; | |
492 | int dsize; | |
493 | ||
494 | if (size < 2) | |
495 | { | |
496 | *al = SSL_AD_DECODE_ERROR; | |
497 | return 0; | |
498 | } | |
499 | n2s(data,dsize); | |
500 | size -= 2; | |
501 | if (dsize > size ) | |
502 | { | |
503 | *al = SSL_AD_DECODE_ERROR; | |
504 | return 0; | |
505 | } | |
506 | ||
507 | sdata = data; | |
508 | while (dsize > 3) | |
509 | { | |
510 | servname_type = *(sdata++); | |
511 | n2s(sdata,len); | |
512 | dsize -= 3; | |
513 | ||
514 | if (len > dsize) | |
515 | { | |
516 | *al = SSL_AD_DECODE_ERROR; | |
517 | return 0; | |
518 | } | |
519 | if (s->servername_done == 0) | |
520 | switch (servname_type) | |
521 | { | |
522 | case TLSEXT_NAMETYPE_host_name: | |
2ae47ddb | 523 | if (!s->hit) |
865a90eb | 524 | { |
2ae47ddb DSH |
525 | if(s->session->tlsext_hostname) |
526 | { | |
527 | *al = SSL_AD_DECODE_ERROR; | |
528 | return 0; | |
529 | } | |
530 | if (len > TLSEXT_MAXLEN_host_name) | |
865a90eb DSH |
531 | { |
532 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
533 | return 0; | |
534 | } | |
2ae47ddb DSH |
535 | if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) |
536 | { | |
537 | *al = TLS1_AD_INTERNAL_ERROR; | |
538 | return 0; | |
539 | } | |
865a90eb DSH |
540 | memcpy(s->session->tlsext_hostname, sdata, len); |
541 | s->session->tlsext_hostname[len]='\0'; | |
542 | if (strlen(s->session->tlsext_hostname) != len) { | |
543 | OPENSSL_free(s->session->tlsext_hostname); | |
d3b3a6d3 | 544 | s->session->tlsext_hostname = NULL; |
865a90eb DSH |
545 | *al = TLS1_AD_UNRECOGNIZED_NAME; |
546 | return 0; | |
547 | } | |
548 | s->servername_done = 1; | |
549 | ||
550 | } | |
551 | else | |
2ae47ddb DSH |
552 | s->servername_done = s->session->tlsext_hostname |
553 | && strlen(s->session->tlsext_hostname) == len | |
865a90eb DSH |
554 | && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; |
555 | ||
556 | break; | |
557 | ||
558 | default: | |
559 | break; | |
560 | } | |
561 | ||
562 | dsize -= len; | |
563 | } | |
564 | if (dsize != 0) | |
565 | { | |
566 | *al = SSL_AD_DECODE_ERROR; | |
567 | return 0; | |
568 | } | |
569 | ||
c2b78c31 BL |
570 | } |
571 | else if (type == TLSEXT_TYPE_renegotiate) | |
572 | { | |
573 | if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) | |
574 | return 0; | |
575 | renegotiate_seen = 1; | |
865a90eb | 576 | } |
7a014dce DSH |
577 | else if (type == TLSEXT_TYPE_status_request && |
578 | s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) | |
a5232767 DSH |
579 | { |
580 | ||
581 | if (size < 5) | |
582 | { | |
583 | *al = SSL_AD_DECODE_ERROR; | |
584 | return 0; | |
585 | } | |
586 | ||
587 | s->tlsext_status_type = *data++; | |
588 | size--; | |
589 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) | |
590 | { | |
591 | const unsigned char *sdata; | |
592 | int dsize; | |
593 | /* Read in responder_id_list */ | |
594 | n2s(data,dsize); | |
595 | size -= 2; | |
596 | if (dsize > size ) | |
597 | { | |
598 | *al = SSL_AD_DECODE_ERROR; | |
599 | return 0; | |
600 | } | |
601 | while (dsize > 0) | |
602 | { | |
603 | OCSP_RESPID *id; | |
604 | int idsize; | |
605 | if (dsize < 4) | |
606 | { | |
607 | *al = SSL_AD_DECODE_ERROR; | |
608 | return 0; | |
609 | } | |
610 | n2s(data, idsize); | |
611 | dsize -= 2 + idsize; | |
957ebe98 | 612 | size -= 2 + idsize; |
a5232767 DSH |
613 | if (dsize < 0) |
614 | { | |
615 | *al = SSL_AD_DECODE_ERROR; | |
616 | return 0; | |
617 | } | |
618 | sdata = data; | |
619 | data += idsize; | |
620 | id = d2i_OCSP_RESPID(NULL, | |
621 | &sdata, idsize); | |
622 | if (!id) | |
623 | { | |
624 | *al = SSL_AD_DECODE_ERROR; | |
625 | return 0; | |
626 | } | |
627 | if (data != sdata) | |
628 | { | |
629 | OCSP_RESPID_free(id); | |
630 | *al = SSL_AD_DECODE_ERROR; | |
631 | return 0; | |
632 | } | |
633 | if (!s->tlsext_ocsp_ids | |
634 | && !(s->tlsext_ocsp_ids = | |
635 | sk_OCSP_RESPID_new_null())) | |
636 | { | |
637 | OCSP_RESPID_free(id); | |
638 | *al = SSL_AD_INTERNAL_ERROR; | |
639 | return 0; | |
640 | } | |
641 | if (!sk_OCSP_RESPID_push( | |
642 | s->tlsext_ocsp_ids, id)) | |
643 | { | |
644 | OCSP_RESPID_free(id); | |
645 | *al = SSL_AD_INTERNAL_ERROR; | |
646 | return 0; | |
647 | } | |
648 | } | |
649 | ||
650 | /* Read in request_extensions */ | |
957ebe98 BM |
651 | if (size < 2) |
652 | { | |
653 | *al = SSL_AD_DECODE_ERROR; | |
654 | return 0; | |
655 | } | |
a5232767 DSH |
656 | n2s(data,dsize); |
657 | size -= 2; | |
957ebe98 | 658 | if (dsize != size) |
a5232767 DSH |
659 | { |
660 | *al = SSL_AD_DECODE_ERROR; | |
661 | return 0; | |
662 | } | |
663 | sdata = data; | |
664 | if (dsize > 0) | |
665 | { | |
0c214e01 DSH |
666 | if (s->tlsext_ocsp_exts) |
667 | { | |
668 | sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, | |
669 | X509_EXTENSION_free); | |
670 | } | |
671 | ||
a5232767 DSH |
672 | s->tlsext_ocsp_exts = |
673 | d2i_X509_EXTENSIONS(NULL, | |
674 | &sdata, dsize); | |
675 | if (!s->tlsext_ocsp_exts | |
676 | || (data + dsize != sdata)) | |
677 | { | |
678 | *al = SSL_AD_DECODE_ERROR; | |
679 | return 0; | |
680 | } | |
681 | } | |
682 | } | |
683 | /* We don't know what to do with any other type | |
684 | * so ignore it. | |
685 | */ | |
686 | else | |
687 | s->tlsext_status_type = -1; | |
688 | } | |
c2b78c31 | 689 | |
865a90eb DSH |
690 | /* session ticket processed earlier */ |
691 | ||
692 | data+=size; | |
693 | } | |
efbe446f DSH |
694 | *p = data; |
695 | ||
696 | ri_check: | |
865a90eb | 697 | |
efbe446f DSH |
698 | /* Need RI if renegotiating */ |
699 | ||
700 | if (!renegotiate_seen && s->new_session && | |
701 | !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) | |
c2b78c31 | 702 | { |
98809a14 | 703 | *al = SSL_AD_HANDSHAKE_FAILURE; |
725745d1 DSH |
704 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, |
705 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
c2b78c31 BL |
706 | return 0; |
707 | } | |
708 | ||
865a90eb DSH |
709 | return 1; |
710 | } | |
711 | ||
712 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) | |
713 | { | |
d8869758 | 714 | unsigned short length; |
865a90eb DSH |
715 | unsigned short type; |
716 | unsigned short size; | |
865a90eb | 717 | unsigned char *data = *p; |
865a90eb | 718 | int tlsext_servername = 0; |
c2b78c31 | 719 | int renegotiate_seen = 0; |
865a90eb DSH |
720 | |
721 | if (data >= (d+n-2)) | |
efbe446f | 722 | goto ri_check; |
865a90eb | 723 | |
d8869758 BL |
724 | n2s(data,length); |
725 | if (data+length != d+n) | |
726 | { | |
727 | *al = SSL_AD_DECODE_ERROR; | |
728 | return 0; | |
729 | } | |
865a90eb DSH |
730 | |
731 | while(data <= (d+n-4)) | |
732 | { | |
733 | n2s(data,type); | |
734 | n2s(data,size); | |
735 | ||
736 | if (data+size > (d+n)) | |
efbe446f | 737 | goto ri_check; |
865a90eb DSH |
738 | |
739 | if (s->tlsext_debug_cb) | |
740 | s->tlsext_debug_cb(s, 1, type, data, size, | |
741 | s->tlsext_debug_arg); | |
742 | ||
743 | if (type == TLSEXT_TYPE_server_name) | |
744 | { | |
745 | if (s->tlsext_hostname == NULL || size > 0) | |
746 | { | |
747 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
748 | return 0; | |
749 | } | |
750 | tlsext_servername = 1; | |
751 | } | |
752 | else if (type == TLSEXT_TYPE_session_ticket) | |
753 | { | |
754 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) | |
755 | || (size > 0)) | |
756 | { | |
757 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
758 | return 0; | |
759 | } | |
760 | s->tlsext_ticket_expected = 1; | |
761 | } | |
7a014dce DSH |
762 | else if (type == TLSEXT_TYPE_status_request && |
763 | s->version != DTLS1_VERSION) | |
a5232767 DSH |
764 | { |
765 | /* MUST be empty and only sent if we've requested | |
766 | * a status request message. | |
767 | */ | |
768 | if ((s->tlsext_status_type == -1) || (size > 0)) | |
769 | { | |
770 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
771 | return 0; | |
772 | } | |
773 | /* Set flag to expect CertificateStatus message */ | |
774 | s->tlsext_status_expected = 1; | |
775 | } | |
c2b78c31 BL |
776 | else if (type == TLSEXT_TYPE_renegotiate) |
777 | { | |
778 | if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) | |
779 | return 0; | |
780 | renegotiate_seen = 1; | |
781 | } | |
865a90eb DSH |
782 | data+=size; |
783 | } | |
784 | ||
785 | if (data != d+n) | |
786 | { | |
787 | *al = SSL_AD_DECODE_ERROR; | |
788 | return 0; | |
789 | } | |
790 | ||
791 | if (!s->hit && tlsext_servername == 1) | |
792 | { | |
793 | if (s->tlsext_hostname) | |
794 | { | |
795 | if (s->session->tlsext_hostname == NULL) | |
796 | { | |
797 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); | |
798 | if (!s->session->tlsext_hostname) | |
799 | { | |
800 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
801 | return 0; | |
802 | } | |
803 | } | |
804 | else | |
805 | { | |
806 | *al = SSL_AD_DECODE_ERROR; | |
807 | return 0; | |
808 | } | |
809 | } | |
810 | } | |
811 | ||
812 | *p = data; | |
efbe446f DSH |
813 | |
814 | ri_check: | |
815 | ||
816 | /* Determine if we need to see RI. Strictly speaking if we want to | |
817 | * avoid an attack we should *always* see RI even on initial server | |
818 | * hello because the client doesn't see any renegotiation during an | |
819 | * attack. However this would mean we could not connect to any server | |
820 | * which doesn't support RI so for the immediate future tolerate RI | |
821 | * absence on initial connect only. | |
822 | */ | |
442ac8d2 DSH |
823 | if (!renegotiate_seen |
824 | && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
ccc3df8c | 825 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) |
efbe446f | 826 | { |
98809a14 | 827 | *al = SSL_AD_HANDSHAKE_FAILURE; |
efbe446f DSH |
828 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, |
829 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
830 | return 0; | |
831 | } | |
832 | ||
865a90eb DSH |
833 | return 1; |
834 | } | |
835 | ||
48bcdad0 | 836 | int ssl_check_clienthello_tlsext_early(SSL *s) |
865a90eb DSH |
837 | { |
838 | int ret=SSL_TLSEXT_ERR_NOACK; | |
839 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
840 | ||
841 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
842 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
843 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
844 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
845 | ||
48bcdad0 BL |
846 | switch (ret) |
847 | { | |
848 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
849 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
850 | return -1; | |
851 | ||
852 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
853 | ssl3_send_alert(s, SSL3_AL_WARNING, al); | |
854 | return 1; | |
855 | ||
856 | case SSL_TLSEXT_ERR_NOACK: | |
857 | s->servername_done = 0; | |
858 | ||
859 | default: | |
860 | return 1; | |
861 | } | |
862 | } | |
863 | ||
864 | int ssl_check_clienthello_tlsext_late(SSL *s) | |
865 | { | |
866 | int ret = SSL_TLSEXT_ERR_OK; | |
867 | int al; | |
868 | ||
a5232767 DSH |
869 | /* If status request then ask callback what to do. |
870 | * Note: this must be called after servername callbacks in case | |
48bcdad0 BL |
871 | * the certificate has changed, and must be called after the cipher |
872 | * has been chosen because this may influence which certificate is sent | |
a5232767 | 873 | */ |
48bcdad0 | 874 | if (s->tlsext_status_type != -1 && s->ctx && s->ctx->tlsext_status_cb) |
a5232767 DSH |
875 | { |
876 | int r; | |
71a2440e DSH |
877 | CERT_PKEY *certpkey; |
878 | certpkey = ssl_get_server_send_pkey(s); | |
879 | /* If no certificate can't return certificate status */ | |
880 | if (certpkey == NULL) | |
881 | { | |
882 | s->tlsext_status_expected = 0; | |
883 | return 1; | |
884 | } | |
885 | /* Set current certificate to one we will use so | |
886 | * SSL_get_certificate et al can pick it up. | |
887 | */ | |
888 | s->cert->key = certpkey; | |
a5232767 DSH |
889 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); |
890 | switch (r) | |
891 | { | |
892 | /* We don't want to send a status request response */ | |
893 | case SSL_TLSEXT_ERR_NOACK: | |
894 | s->tlsext_status_expected = 0; | |
895 | break; | |
896 | /* status request response should be sent */ | |
897 | case SSL_TLSEXT_ERR_OK: | |
898 | if (s->tlsext_ocsp_resp) | |
899 | s->tlsext_status_expected = 1; | |
900 | else | |
901 | s->tlsext_status_expected = 0; | |
902 | break; | |
903 | /* something bad happened */ | |
904 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
905 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
906 | al = SSL_AD_INTERNAL_ERROR; | |
907 | goto err; | |
908 | } | |
909 | } | |
910 | else | |
911 | s->tlsext_status_expected = 0; | |
48bcdad0 BL |
912 | |
913 | err: | |
865a90eb DSH |
914 | switch (ret) |
915 | { | |
916 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
917 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
918 | return -1; | |
919 | ||
920 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
921 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
922 | return 1; | |
48bcdad0 BL |
923 | |
924 | default: | |
925 | return 1; | |
865a90eb DSH |
926 | } |
927 | } | |
928 | ||
929 | int ssl_check_serverhello_tlsext(SSL *s) | |
930 | { | |
931 | int ret=SSL_TLSEXT_ERR_NOACK; | |
932 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
933 | ||
934 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
935 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
936 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
937 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
938 | ||
a5232767 DSH |
939 | /* If we've requested certificate status and we wont get one |
940 | * tell the callback | |
941 | */ | |
942 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
943 | && s->ctx->tlsext_status_cb) | |
944 | { | |
945 | int r; | |
946 | /* Set resp to NULL, resplen to -1 so callback knows | |
947 | * there is no response. | |
948 | */ | |
949 | if (s->tlsext_ocsp_resp) | |
950 | { | |
951 | OPENSSL_free(s->tlsext_ocsp_resp); | |
952 | s->tlsext_ocsp_resp = NULL; | |
953 | } | |
954 | s->tlsext_ocsp_resplen = -1; | |
955 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
956 | if (r == 0) | |
957 | { | |
958 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
959 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
960 | } | |
961 | if (r < 0) | |
962 | { | |
963 | al = SSL_AD_INTERNAL_ERROR; | |
964 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
965 | } | |
966 | } | |
967 | ||
865a90eb DSH |
968 | switch (ret) |
969 | { | |
970 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
971 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
972 | return -1; | |
973 | ||
974 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
975 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
976 | return 1; | |
977 | ||
978 | case SSL_TLSEXT_ERR_NOACK: | |
979 | s->servername_done=0; | |
980 | default: | |
981 | return 1; | |
982 | } | |
983 | } | |
984 | ||
985 | /* Since the server cache lookup is done early on in the processing of client | |
986 | * hello and other operations depend on the result we need to handle any TLS | |
987 | * session ticket extension at the same time. | |
988 | */ | |
989 | ||
990 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, | |
991 | const unsigned char *limit, SSL_SESSION **ret) | |
992 | { | |
993 | /* Point after session ID in client hello */ | |
994 | const unsigned char *p = session_id + len; | |
995 | unsigned short i; | |
8f59c61d DSH |
996 | |
997 | /* If tickets disabled behave as if no ticket present | |
998 | * to permit stateful resumption. | |
999 | */ | |
1000 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) | |
1001 | return 1; | |
1002 | ||
865a90eb DSH |
1003 | if ((s->version <= SSL3_VERSION) || !limit) |
1004 | return 1; | |
1005 | if (p >= limit) | |
1006 | return -1; | |
197ab47b DSH |
1007 | /* Skip past DTLS cookie */ |
1008 | if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) | |
1009 | { | |
1010 | i = *(p++); | |
1011 | p+= i; | |
1012 | if (p >= limit) | |
1013 | return -1; | |
1014 | } | |
865a90eb DSH |
1015 | /* Skip past cipher list */ |
1016 | n2s(p, i); | |
1017 | p+= i; | |
1018 | if (p >= limit) | |
1019 | return -1; | |
1020 | /* Skip past compression algorithm list */ | |
1021 | i = *(p++); | |
1022 | p += i; | |
1023 | if (p > limit) | |
1024 | return -1; | |
1025 | /* Now at start of extensions */ | |
1026 | if ((p + 2) >= limit) | |
1027 | return 1; | |
1028 | n2s(p, i); | |
1029 | while ((p + 4) <= limit) | |
1030 | { | |
1031 | unsigned short type, size; | |
1032 | n2s(p, type); | |
1033 | n2s(p, size); | |
1034 | if (p + size > limit) | |
1035 | return 1; | |
1036 | if (type == TLSEXT_TYPE_session_ticket) | |
1037 | { | |
8f59c61d | 1038 | /* If zero length note client will accept a ticket |
865a90eb DSH |
1039 | * and indicate cache miss to trigger full handshake |
1040 | */ | |
1041 | if (size == 0) | |
1042 | { | |
1043 | s->tlsext_ticket_expected = 1; | |
1044 | return 0; /* Cache miss */ | |
1045 | } | |
1046 | return tls_decrypt_ticket(s, p, size, session_id, len, | |
1047 | ret); | |
1048 | } | |
1049 | p += size; | |
1050 | } | |
1051 | return 1; | |
1052 | } | |
1053 | ||
1054 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, | |
1055 | const unsigned char *sess_id, int sesslen, | |
1056 | SSL_SESSION **psess) | |
1057 | { | |
1058 | SSL_SESSION *sess; | |
1059 | unsigned char *sdec; | |
1060 | const unsigned char *p; | |
db533c96 | 1061 | int slen, mlen, renew_ticket = 0; |
865a90eb DSH |
1062 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; |
1063 | HMAC_CTX hctx; | |
1064 | EVP_CIPHER_CTX ctx; | |
2a8834cf | 1065 | SSL_CTX *tctx = s->initial_ctx; |
db533c96 DSH |
1066 | /* Need at least keyname + iv + some encrypted data */ |
1067 | if (eticklen < 48) | |
1068 | goto tickerr; | |
1069 | /* Initialize session ticket encryption and HMAC contexts */ | |
1070 | HMAC_CTX_init(&hctx); | |
1071 | EVP_CIPHER_CTX_init(&ctx); | |
2a8834cf | 1072 | if (tctx->tlsext_ticket_key_cb) |
db533c96 DSH |
1073 | { |
1074 | unsigned char *nctick = (unsigned char *)etick; | |
2a8834cf | 1075 | int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, |
db533c96 DSH |
1076 | &ctx, &hctx, 0); |
1077 | if (rv < 0) | |
1078 | return -1; | |
1079 | if (rv == 0) | |
1080 | goto tickerr; | |
1081 | if (rv == 2) | |
1082 | renew_ticket = 1; | |
1083 | } | |
1084 | else | |
1085 | { | |
1086 | /* Check key name matches */ | |
2a8834cf | 1087 | if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) |
db533c96 | 1088 | goto tickerr; |
2a8834cf | 1089 | HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
db533c96 DSH |
1090 | tlsext_tick_md(), NULL); |
1091 | EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
2a8834cf | 1092 | tctx->tlsext_tick_aes_key, etick + 16); |
db533c96 | 1093 | } |
865a90eb DSH |
1094 | /* Attempt to process session ticket, first conduct sanity and |
1095 | * integrity checks on ticket. | |
1096 | */ | |
db533c96 | 1097 | mlen = HMAC_size(&hctx); |
865a90eb | 1098 | eticklen -= mlen; |
865a90eb | 1099 | /* Check HMAC of encrypted ticket */ |
865a90eb DSH |
1100 | HMAC_Update(&hctx, etick, eticklen); |
1101 | HMAC_Final(&hctx, tick_hmac, NULL); | |
1102 | HMAC_CTX_cleanup(&hctx); | |
27088131 | 1103 | if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) |
2ed80d14 DSH |
1104 | { |
1105 | EVP_CIPHER_CTX_cleanup(&ctx); | |
865a90eb | 1106 | goto tickerr; |
2ed80d14 | 1107 | } |
865a90eb | 1108 | /* Attempt to decrypt session data */ |
865a90eb | 1109 | /* Move p after IV to start of encrypted ticket, update length */ |
db533c96 DSH |
1110 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); |
1111 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
865a90eb DSH |
1112 | sdec = OPENSSL_malloc(eticklen); |
1113 | if (!sdec) | |
1114 | { | |
1115 | EVP_CIPHER_CTX_cleanup(&ctx); | |
1116 | return -1; | |
1117 | } | |
1118 | EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); | |
1119 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) | |
9e6857a3 DSH |
1120 | { |
1121 | EVP_CIPHER_CTX_cleanup(&ctx); | |
1122 | OPENSSL_free(sdec); | |
865a90eb | 1123 | goto tickerr; |
9e6857a3 | 1124 | } |
865a90eb DSH |
1125 | slen += mlen; |
1126 | EVP_CIPHER_CTX_cleanup(&ctx); | |
1127 | p = sdec; | |
1128 | ||
1129 | sess = d2i_SSL_SESSION(NULL, &p, slen); | |
1130 | OPENSSL_free(sdec); | |
1131 | if (sess) | |
1132 | { | |
1133 | /* The session ID if non-empty is used by some clients to | |
1134 | * detect that the ticket has been accepted. So we copy it to | |
1135 | * the session structure. If it is empty set length to zero | |
1136 | * as required by standard. | |
1137 | */ | |
1138 | if (sesslen) | |
1139 | memcpy(sess->session_id, sess_id, sesslen); | |
1140 | sess->session_id_length = sesslen; | |
1141 | *psess = sess; | |
db533c96 | 1142 | s->tlsext_ticket_expected = renew_ticket; |
865a90eb DSH |
1143 | return 1; |
1144 | } | |
1145 | /* If session decrypt failure indicate a cache miss and set state to | |
1146 | * send a new ticket | |
1147 | */ | |
1148 | tickerr: | |
1149 | s->tlsext_ticket_expected = 1; | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | #endif |