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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 | */ | |
f1fd4544 | 58 | /* ==================================================================== |
52b8dad8 | 59 | * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
f1fd4544 BM |
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 | */ | |
58964a49 RE |
111 | |
112 | #include <stdio.h> | |
ec577822 | 113 | #include <openssl/objects.h> |
6434abbf DSH |
114 | #include <openssl/evp.h> |
115 | #include <openssl/hmac.h> | |
67c8e7f4 | 116 | #include <openssl/ocsp.h> |
58964a49 RE |
117 | #include "ssl_locl.h" |
118 | ||
42182852 | 119 | const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; |
58964a49 | 120 | |
367eb1f1 | 121 | #ifndef OPENSSL_NO_TLSEXT |
6434abbf DSH |
122 | static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, |
123 | const unsigned char *sess_id, int sesslen, | |
124 | SSL_SESSION **psess); | |
367eb1f1 | 125 | #endif |
6434abbf | 126 | |
f3b656b2 | 127 | SSL3_ENC_METHOD TLSv1_enc_data={ |
58964a49 RE |
128 | tls1_enc, |
129 | tls1_mac, | |
130 | tls1_setup_key_block, | |
131 | tls1_generate_master_secret, | |
132 | tls1_change_cipher_state, | |
133 | tls1_final_finish_mac, | |
134 | TLS1_FINISH_MAC_LENGTH, | |
135 | tls1_cert_verify_mac, | |
136 | TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
137 | TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, | |
138 | tls1_alert_code, | |
139 | }; | |
140 | ||
f3b656b2 | 141 | long tls1_default_timeout(void) |
58964a49 RE |
142 | { |
143 | /* 2 hours, the 24 hours mentioned in the TLSv1 spec | |
144 | * is way too long for http, the cache would over fill */ | |
145 | return(60*60*2); | |
146 | } | |
147 | ||
6b691a5c | 148 | int tls1_new(SSL *s) |
58964a49 RE |
149 | { |
150 | if (!ssl3_new(s)) return(0); | |
151 | s->method->ssl_clear(s); | |
152 | return(1); | |
153 | } | |
154 | ||
6b691a5c | 155 | void tls1_free(SSL *s) |
58964a49 RE |
156 | { |
157 | ssl3_free(s); | |
158 | } | |
159 | ||
6b691a5c | 160 | void tls1_clear(SSL *s) |
58964a49 RE |
161 | { |
162 | ssl3_clear(s); | |
163 | s->version=TLS1_VERSION; | |
164 | } | |
165 | ||
525de5d3 DSH |
166 | #ifndef OPENSSL_NO_EC |
167 | static int nid_list[] = | |
168 | { | |
169 | NID_sect163k1, /* sect163k1 (1) */ | |
170 | NID_sect163r1, /* sect163r1 (2) */ | |
171 | NID_sect163r2, /* sect163r2 (3) */ | |
172 | NID_sect193r1, /* sect193r1 (4) */ | |
173 | NID_sect193r2, /* sect193r2 (5) */ | |
174 | NID_sect233k1, /* sect233k1 (6) */ | |
175 | NID_sect233r1, /* sect233r1 (7) */ | |
176 | NID_sect239k1, /* sect239k1 (8) */ | |
177 | NID_sect283k1, /* sect283k1 (9) */ | |
178 | NID_sect283r1, /* sect283r1 (10) */ | |
179 | NID_sect409k1, /* sect409k1 (11) */ | |
180 | NID_sect409r1, /* sect409r1 (12) */ | |
181 | NID_sect571k1, /* sect571k1 (13) */ | |
182 | NID_sect571r1, /* sect571r1 (14) */ | |
183 | NID_secp160k1, /* secp160k1 (15) */ | |
184 | NID_secp160r1, /* secp160r1 (16) */ | |
185 | NID_secp160r2, /* secp160r2 (17) */ | |
186 | NID_secp192k1, /* secp192k1 (18) */ | |
187 | NID_X9_62_prime192v1, /* secp192r1 (19) */ | |
188 | NID_secp224k1, /* secp224k1 (20) */ | |
189 | NID_secp224r1, /* secp224r1 (21) */ | |
190 | NID_secp256k1, /* secp256k1 (22) */ | |
191 | NID_X9_62_prime256v1, /* secp256r1 (23) */ | |
192 | NID_secp384r1, /* secp384r1 (24) */ | |
193 | NID_secp521r1 /* secp521r1 (25) */ | |
194 | }; | |
195 | ||
196 | int tls1_ec_curve_id2nid(int curve_id) | |
197 | { | |
198 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
199 | if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0; | |
200 | return nid_list[curve_id-1]; | |
201 | } | |
202 | ||
203 | int tls1_ec_nid2curve_id(int nid) | |
204 | { | |
205 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
206 | switch (nid) | |
207 | { | |
208 | case NID_sect163k1: /* sect163k1 (1) */ | |
209 | return 1; | |
210 | case NID_sect163r1: /* sect163r1 (2) */ | |
211 | return 2; | |
212 | case NID_sect163r2: /* sect163r2 (3) */ | |
213 | return 3; | |
214 | case NID_sect193r1: /* sect193r1 (4) */ | |
215 | return 4; | |
216 | case NID_sect193r2: /* sect193r2 (5) */ | |
217 | return 5; | |
218 | case NID_sect233k1: /* sect233k1 (6) */ | |
219 | return 6; | |
220 | case NID_sect233r1: /* sect233r1 (7) */ | |
221 | return 7; | |
222 | case NID_sect239k1: /* sect239k1 (8) */ | |
223 | return 8; | |
224 | case NID_sect283k1: /* sect283k1 (9) */ | |
225 | return 9; | |
226 | case NID_sect283r1: /* sect283r1 (10) */ | |
227 | return 10; | |
228 | case NID_sect409k1: /* sect409k1 (11) */ | |
229 | return 11; | |
230 | case NID_sect409r1: /* sect409r1 (12) */ | |
231 | return 12; | |
232 | case NID_sect571k1: /* sect571k1 (13) */ | |
233 | return 13; | |
234 | case NID_sect571r1: /* sect571r1 (14) */ | |
235 | return 14; | |
236 | case NID_secp160k1: /* secp160k1 (15) */ | |
237 | return 15; | |
238 | case NID_secp160r1: /* secp160r1 (16) */ | |
239 | return 16; | |
240 | case NID_secp160r2: /* secp160r2 (17) */ | |
241 | return 17; | |
242 | case NID_secp192k1: /* secp192k1 (18) */ | |
243 | return 18; | |
244 | case NID_X9_62_prime192v1: /* secp192r1 (19) */ | |
245 | return 19; | |
246 | case NID_secp224k1: /* secp224k1 (20) */ | |
247 | return 20; | |
248 | case NID_secp224r1: /* secp224r1 (21) */ | |
249 | return 21; | |
250 | case NID_secp256k1: /* secp256k1 (22) */ | |
251 | return 22; | |
252 | case NID_X9_62_prime256v1: /* secp256r1 (23) */ | |
253 | return 23; | |
254 | case NID_secp384r1: /* secp384r1 (24) */ | |
255 | return 24; | |
256 | case NID_secp521r1: /* secp521r1 (25) */ | |
257 | return 25; | |
258 | default: | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | #endif /* OPENSSL_NO_EC */ | |
f1fd4544 | 263 | |
ed3883d2 | 264 | #ifndef OPENSSL_NO_TLSEXT |
f1fd4544 BM |
265 | unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
266 | { | |
ed3883d2 BM |
267 | int extdatalen=0; |
268 | unsigned char *ret = p; | |
269 | ||
270 | ret+=2; | |
271 | ||
272 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
6434abbf | 273 | |
a70183bc | 274 | if (s->tlsext_hostname != NULL) |
f1fd4544 | 275 | { |
ed3883d2 BM |
276 | /* Add TLS extension servername to the Client Hello message */ |
277 | unsigned long size_str; | |
278 | long lenmax; | |
279 | ||
a70183bc | 280 | /* check for enough space. |
52b8dad8 BM |
281 | 4 for the servername type and entension length |
282 | 2 for servernamelist length | |
283 | 1 for the hostname type | |
284 | 2 for hostname length | |
285 | + hostname length | |
a70183bc | 286 | */ |
52b8dad8 | 287 | |
761772d7 BM |
288 | if ((lenmax = limit - ret - 9) < 0 |
289 | || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) | |
a70183bc BM |
290 | return NULL; |
291 | ||
292 | /* extension type and length */ | |
293 | s2n(TLSEXT_TYPE_server_name,ret); | |
294 | s2n(size_str+5,ret); | |
f1fd4544 | 295 | |
a70183bc | 296 | /* length of servername list */ |
ed3883d2 | 297 | s2n(size_str+3,ret); |
a70183bc BM |
298 | |
299 | /* hostname type, length and hostname */ | |
f1fd4544 | 300 | *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; |
ed3883d2 | 301 | s2n(size_str,ret); |
ed3883d2 BM |
302 | memcpy(ret, s->tlsext_hostname, size_str); |
303 | ret+=size_str; | |
f1fd4544 | 304 | } |
761772d7 | 305 | |
36ca4ba6 BM |
306 | #ifndef OPENSSL_NO_EC |
307 | if (s->tlsext_ecpointformatlist != NULL) | |
308 | { | |
309 | /* Add TLS extension ECPointFormats to the ClientHello message */ | |
310 | long lenmax; | |
311 | ||
761772d7 | 312 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
36ca4ba6 | 313 | if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; |
019fdc78 BM |
314 | if (s->tlsext_ecpointformatlist_length > 255) |
315 | { | |
316 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
317 | return NULL; | |
318 | } | |
36ca4ba6 BM |
319 | |
320 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
321 | s2n(s->tlsext_ecpointformatlist_length + 1,ret); | |
322 | *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; | |
323 | memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); | |
324 | ret+=s->tlsext_ecpointformatlist_length; | |
325 | } | |
33273721 BM |
326 | if (s->tlsext_ellipticcurvelist != NULL) |
327 | { | |
328 | /* Add TLS extension EllipticCurves to the ClientHello message */ | |
329 | long lenmax; | |
330 | ||
761772d7 | 331 | if ((lenmax = limit - ret - 6) < 0) return NULL; |
33273721 | 332 | if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; |
a4974de9 | 333 | if (s->tlsext_ellipticcurvelist_length > 65532) |
33273721 BM |
334 | { |
335 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | s2n(TLSEXT_TYPE_elliptic_curves,ret); | |
a123c552 | 340 | s2n(s->tlsext_ellipticcurvelist_length + 2, ret); |
a4974de9 BM |
341 | |
342 | /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for | |
343 | * elliptic_curve_list, but the examples use two bytes. | |
344 | * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html | |
345 | * resolves this to two bytes. | |
346 | */ | |
a123c552 | 347 | s2n(s->tlsext_ellipticcurvelist_length, ret); |
33273721 BM |
348 | memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); |
349 | ret+=s->tlsext_ellipticcurvelist_length; | |
350 | } | |
36ca4ba6 | 351 | #endif /* OPENSSL_NO_EC */ |
d3442bc7 | 352 | |
6434abbf DSH |
353 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) |
354 | { | |
355 | int ticklen; | |
356 | if (s->session && s->session->tlsext_tick) | |
357 | ticklen = s->session->tlsext_ticklen; | |
358 | else | |
359 | ticklen = 0; | |
360 | /* Check for enough room 2 for extension type, 2 for len | |
361 | * rest for ticket | |
362 | */ | |
761772d7 | 363 | if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; |
6434abbf DSH |
364 | s2n(TLSEXT_TYPE_session_ticket,ret); |
365 | s2n(ticklen,ret); | |
366 | if (ticklen) | |
367 | { | |
368 | memcpy(ret, s->session->tlsext_tick, ticklen); | |
369 | ret += ticklen; | |
370 | } | |
371 | } | |
372 | ||
761772d7 BM |
373 | #ifdef TLSEXT_TYPE_opaque_prf_input |
374 | if (s->s3->client_opaque_prf_input != NULL) | |
375 | { | |
376 | size_t col = s->s3->client_opaque_prf_input_len; | |
377 | ||
378 | if ((long)(limit - ret - 6 - col < 0)) | |
379 | return NULL; | |
380 | if (col > 0xFFFD) /* can't happen */ | |
381 | return NULL; | |
382 | ||
383 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
384 | s2n(col + 2, ret); | |
385 | s2n(col, ret); | |
386 | memcpy(ret, s->s3->client_opaque_prf_input, col); | |
387 | ret += col; | |
388 | } | |
389 | #endif | |
390 | ||
67c8e7f4 DSH |
391 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) |
392 | { | |
393 | int i; | |
394 | long extlen, idlen, itmp; | |
395 | OCSP_RESPID *id; | |
396 | ||
397 | idlen = 0; | |
398 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
399 | { | |
400 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
401 | itmp = i2d_OCSP_RESPID(id, NULL); | |
402 | if (itmp <= 0) | |
403 | return NULL; | |
404 | idlen += itmp + 2; | |
405 | } | |
406 | ||
407 | if (s->tlsext_ocsp_exts) | |
408 | { | |
409 | extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
410 | if (extlen < 0) | |
411 | return NULL; | |
412 | } | |
413 | else | |
414 | extlen = 0; | |
415 | ||
416 | if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; | |
417 | s2n(TLSEXT_TYPE_status_request, ret); | |
418 | if (extlen + idlen > 0xFFF0) | |
419 | return NULL; | |
420 | s2n(extlen + idlen + 5, ret); | |
421 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
422 | s2n(idlen, ret); | |
423 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
424 | { | |
425 | /* save position of id len */ | |
426 | unsigned char *q = ret; | |
427 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
428 | /* skip over id len */ | |
429 | ret += 2; | |
430 | itmp = i2d_OCSP_RESPID(id, &ret); | |
431 | /* write id len */ | |
432 | s2n(itmp, q); | |
433 | } | |
434 | s2n(extlen, ret); | |
435 | if (extlen > 0) | |
436 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
437 | } | |
438 | ||
ed3883d2 BM |
439 | if ((extdatalen = ret-p-2)== 0) |
440 | return p; | |
441 | ||
442 | s2n(extdatalen,p); | |
443 | return ret; | |
52b8dad8 | 444 | } |
ed3883d2 | 445 | |
f1fd4544 BM |
446 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
447 | { | |
ed3883d2 BM |
448 | int extdatalen=0; |
449 | unsigned char *ret = p; | |
ed3883d2 | 450 | |
a13c20f6 | 451 | ret+=2; |
ed3883d2 BM |
452 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ |
453 | ||
a13c20f6 | 454 | if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) |
f1fd4544 | 455 | { |
761772d7 | 456 | if ((long)(limit - ret - 4) < 0) return NULL; |
ed3883d2 BM |
457 | |
458 | s2n(TLSEXT_TYPE_server_name,ret); | |
459 | s2n(0,ret); | |
f1fd4544 | 460 | } |
36ca4ba6 BM |
461 | #ifndef OPENSSL_NO_EC |
462 | if (s->tlsext_ecpointformatlist != NULL) | |
463 | { | |
464 | /* Add TLS extension ECPointFormats to the ServerHello message */ | |
465 | long lenmax; | |
466 | ||
761772d7 | 467 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
36ca4ba6 | 468 | if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; |
019fdc78 BM |
469 | if (s->tlsext_ecpointformatlist_length > 255) |
470 | { | |
471 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
472 | return NULL; | |
473 | } | |
36ca4ba6 BM |
474 | |
475 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
476 | s2n(s->tlsext_ecpointformatlist_length + 1,ret); | |
477 | *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; | |
478 | memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); | |
479 | ret+=s->tlsext_ecpointformatlist_length; | |
a70183bc | 480 | |
36ca4ba6 | 481 | } |
33273721 | 482 | /* Currently the server should not respond with a SupportedCurves extension */ |
36ca4ba6 | 483 | #endif /* OPENSSL_NO_EC */ |
67c8e7f4 | 484 | |
6434abbf DSH |
485 | if (s->tlsext_ticket_expected |
486 | && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
487 | { | |
761772d7 | 488 | if ((long)(limit - ret - 4) < 0) return NULL; |
6434abbf DSH |
489 | s2n(TLSEXT_TYPE_session_ticket,ret); |
490 | s2n(0,ret); | |
491 | } | |
761772d7 | 492 | |
67c8e7f4 DSH |
493 | if (s->tlsext_status_expected) |
494 | { | |
495 | if ((long)(limit - ret - 4) < 0) return NULL; | |
496 | s2n(TLSEXT_TYPE_status_request,ret); | |
497 | s2n(0,ret); | |
498 | } | |
499 | ||
761772d7 BM |
500 | #ifdef TLSEXT_TYPE_opaque_prf_input |
501 | if (s->s3->server_opaque_prf_input != NULL) | |
502 | { | |
503 | size_t sol = s->s3->server_opaque_prf_input_len; | |
6434abbf | 504 | |
761772d7 BM |
505 | if ((long)(limit - ret - 6 - sol) < 0) |
506 | return NULL; | |
507 | if (sol > 0xFFFD) /* can't happen */ | |
508 | return NULL; | |
509 | ||
510 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
511 | s2n(sol + 2, ret); | |
512 | s2n(sol, ret); | |
513 | memcpy(ret, s->s3->server_opaque_prf_input, sol); | |
514 | ret += sol; | |
515 | } | |
516 | #endif | |
0e1dba93 DSH |
517 | if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) |
518 | && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) | |
519 | { const unsigned char cryptopro_ext[36] = { | |
520 | 0xfd, 0xe8, /*65000*/ | |
521 | 0x00, 0x20, /*32 bytes length*/ | |
522 | 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, | |
523 | 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, | |
524 | 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, | |
525 | 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; | |
526 | if (limit-ret<36) return NULL; | |
527 | memcpy(ret,cryptopro_ext,36); | |
528 | ret+=36; | |
529 | ||
530 | } | |
761772d7 | 531 | |
ed3883d2 BM |
532 | if ((extdatalen = ret-p-2)== 0) |
533 | return p; | |
534 | ||
535 | s2n(extdatalen,p); | |
536 | return ret; | |
52b8dad8 | 537 | } |
ed3883d2 | 538 | |
f1fd4544 BM |
539 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
540 | { | |
ed3883d2 BM |
541 | unsigned short type; |
542 | unsigned short size; | |
543 | unsigned short len; | |
f1fd4544 | 544 | unsigned char *data = *p; |
a13c20f6 | 545 | s->servername_done = 0; |
67c8e7f4 | 546 | s->tlsext_status_type = -1; |
ed3883d2 BM |
547 | |
548 | if (data >= (d+n-2)) | |
f1fd4544 | 549 | return 1; |
ed3883d2 BM |
550 | n2s(data,len); |
551 | ||
52b8dad8 | 552 | if (data > (d+n-len)) |
f1fd4544 | 553 | return 1; |
ed3883d2 | 554 | |
f1fd4544 BM |
555 | while (data <= (d+n-4)) |
556 | { | |
ed3883d2 BM |
557 | n2s(data,type); |
558 | n2s(data,size); | |
559 | ||
560 | if (data+size > (d+n)) | |
f1fd4544 | 561 | return 1; |
0e1dba93 | 562 | fprintf(stderr,"Received extension type %d size %d\n",type,size); |
6434abbf DSH |
563 | if (s->tlsext_debug_cb) |
564 | s->tlsext_debug_cb(s, 0, type, data, size, | |
565 | s->tlsext_debug_arg); | |
a13c20f6 BM |
566 | /* The servername extension is treated as follows: |
567 | ||
568 | - Only the hostname type is supported with a maximum length of 255. | |
569 | - The servername is rejected if too long or if it contains zeros, | |
570 | in which case an fatal alert is generated. | |
571 | - The servername field is maintained together with the session cache. | |
572 | - When a session is resumed, the servername call back invoked in order | |
573 | to allow the application to position itself to the right context. | |
574 | - The servername is acknowledged if it is new for a session or when | |
575 | it is identical to a previously used for the same session. | |
576 | Applications can control the behaviour. They can at any time | |
577 | set a 'desirable' servername for a new SSL object. This can be the | |
578 | case for example with HTTPS when a Host: header field is received and | |
579 | a renegotiation is requested. In this case, a possible servername | |
580 | presented in the new client hello is only acknowledged if it matches | |
581 | the value of the Host: field. | |
582 | - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | |
583 | if they provide for changing an explicit servername context for the session, | |
584 | i.e. when the session has been established with a servername extension. | |
585 | - On session reconnect, the servername extension may be absent. | |
586 | ||
587 | */ | |
588 | ||
f1fd4544 BM |
589 | if (type == TLSEXT_TYPE_server_name) |
590 | { | |
a70183bc | 591 | unsigned char *sdata; |
ed3883d2 | 592 | int servname_type; |
a70183bc BM |
593 | int dsize; |
594 | ||
595 | if (size < 2) | |
596 | { | |
597 | *al = SSL_AD_DECODE_ERROR; | |
598 | return 0; | |
599 | } | |
600 | n2s(data,dsize); | |
52b8dad8 | 601 | size -= 2; |
a70183bc | 602 | if (dsize > size ) |
f1fd4544 | 603 | { |
a70183bc BM |
604 | *al = SSL_AD_DECODE_ERROR; |
605 | return 0; | |
606 | } | |
607 | ||
608 | sdata = data; | |
609 | while (dsize > 3) | |
610 | { | |
611 | servname_type = *(sdata++); | |
ed3883d2 | 612 | n2s(sdata,len); |
a70183bc BM |
613 | dsize -= 3; |
614 | ||
615 | if (len > dsize) | |
f1fd4544 BM |
616 | { |
617 | *al = SSL_AD_DECODE_ERROR; | |
618 | return 0; | |
619 | } | |
a70183bc | 620 | if (s->servername_done == 0) |
f1fd4544 BM |
621 | switch (servname_type) |
622 | { | |
623 | case TLSEXT_NAMETYPE_host_name: | |
52b8dad8 | 624 | if (s->session->tlsext_hostname == NULL) |
f1fd4544 | 625 | { |
a13c20f6 | 626 | if (len > TLSEXT_MAXLEN_host_name || |
ed3883d2 | 627 | ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)) |
f1fd4544 BM |
628 | { |
629 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
630 | return 0; | |
631 | } | |
ed3883d2 | 632 | memcpy(s->session->tlsext_hostname, sdata, len); |
a13c20f6 BM |
633 | s->session->tlsext_hostname[len]='\0'; |
634 | if (strlen(s->session->tlsext_hostname) != len) { | |
635 | OPENSSL_free(s->session->tlsext_hostname); | |
636 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
637 | return 0; | |
f1fd4544 | 638 | } |
a13c20f6 BM |
639 | s->servername_done = 1; |
640 | ||
a13c20f6 BM |
641 | } |
642 | else | |
643 | s->servername_done = strlen(s->session->tlsext_hostname) == len | |
6b9e941e | 644 | && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; |
a13c20f6 | 645 | |
ed3883d2 | 646 | break; |
f1fd4544 | 647 | |
ed3883d2 BM |
648 | default: |
649 | break; | |
f1fd4544 | 650 | } |
52b8dad8 | 651 | |
a70183bc | 652 | dsize -= len; |
f1fd4544 | 653 | } |
a70183bc BM |
654 | if (dsize != 0) |
655 | { | |
656 | *al = SSL_AD_DECODE_ERROR; | |
657 | return 0; | |
658 | } | |
659 | ||
ed3883d2 | 660 | } |
ed3883d2 | 661 | |
36ca4ba6 BM |
662 | #ifndef OPENSSL_NO_EC |
663 | else if (type == TLSEXT_TYPE_ec_point_formats) | |
664 | { | |
665 | unsigned char *sdata = data; | |
666 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
667 | |
668 | if (ecpointformatlist_length != size - 1) | |
669 | { | |
670 | *al = TLS1_AD_DECODE_ERROR; | |
671 | return 0; | |
672 | } | |
673 | s->session->tlsext_ecpointformatlist_length = 0; | |
b6acb8d0 | 674 | if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); |
36ca4ba6 BM |
675 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) |
676 | { | |
677 | *al = TLS1_AD_INTERNAL_ERROR; | |
678 | return 0; | |
679 | } | |
680 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
681 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
682 | #if 0 | |
683 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); | |
684 | sdata = s->session->tlsext_ecpointformatlist; | |
685 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
686 | fprintf(stderr,"%i ",*(sdata++)); | |
687 | fprintf(stderr,"\n"); | |
33273721 BM |
688 | #endif |
689 | } | |
690 | else if (type == TLSEXT_TYPE_elliptic_curves) | |
691 | { | |
692 | unsigned char *sdata = data; | |
693 | int ellipticcurvelist_length = (*(sdata++) << 8); | |
694 | ellipticcurvelist_length += (*(sdata++)); | |
695 | ||
696 | if (ellipticcurvelist_length != size - 2) | |
697 | { | |
698 | *al = TLS1_AD_DECODE_ERROR; | |
699 | return 0; | |
700 | } | |
701 | s->session->tlsext_ellipticcurvelist_length = 0; | |
702 | if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist); | |
703 | if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) | |
704 | { | |
705 | *al = TLS1_AD_INTERNAL_ERROR; | |
706 | return 0; | |
707 | } | |
708 | s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; | |
709 | memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); | |
710 | #if 0 | |
711 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); | |
712 | sdata = s->session->tlsext_ellipticcurvelist; | |
713 | for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) | |
714 | fprintf(stderr,"%i ",*(sdata++)); | |
715 | fprintf(stderr,"\n"); | |
36ca4ba6 BM |
716 | #endif |
717 | } | |
c6a27f01 | 718 | #endif /* OPENSSL_NO_EC */ |
761772d7 BM |
719 | #ifdef TLSEXT_TYPE_opaque_prf_input |
720 | else if (type == TLSEXT_TYPE_opaque_prf_input) | |
721 | { | |
722 | unsigned char *sdata = data; | |
723 | ||
724 | if (size < 2) | |
725 | { | |
726 | *al = SSL_AD_DECODE_ERROR; | |
727 | return 0; | |
728 | } | |
729 | n2s(sdata, s->s3->client_opaque_prf_input_len); | |
730 | if (s->s3->client_opaque_prf_input_len != size - 2) | |
731 | { | |
732 | *al = SSL_AD_DECODE_ERROR; | |
733 | return 0; | |
734 | } | |
735 | ||
736 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
737 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
02c27b11 BM |
738 | if (s->s3->client_opaque_prf_input_len == 0) |
739 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
740 | else | |
741 | s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); | |
761772d7 BM |
742 | if (s->s3->client_opaque_prf_input == NULL) |
743 | { | |
744 | *al = TLS1_AD_INTERNAL_ERROR; | |
745 | return 0; | |
746 | } | |
747 | } | |
748 | #endif | |
67c8e7f4 DSH |
749 | else if (type == TLSEXT_TYPE_status_request |
750 | && s->ctx->tlsext_status_cb) | |
751 | { | |
752 | ||
753 | if (size < 5) | |
754 | { | |
755 | *al = SSL_AD_DECODE_ERROR; | |
756 | return 0; | |
757 | } | |
758 | ||
759 | s->tlsext_status_type = *data++; | |
760 | size--; | |
761 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) | |
762 | { | |
763 | const unsigned char *sdata; | |
764 | int dsize; | |
765 | /* Read in responder_id_list */ | |
766 | n2s(data,dsize); | |
767 | size -= 2; | |
768 | if (dsize > size ) | |
769 | { | |
770 | *al = SSL_AD_DECODE_ERROR; | |
771 | return 0; | |
772 | } | |
773 | while (dsize > 0) | |
774 | { | |
775 | OCSP_RESPID *id; | |
776 | int idsize; | |
777 | if (dsize < 4) | |
778 | { | |
779 | *al = SSL_AD_DECODE_ERROR; | |
780 | return 0; | |
781 | } | |
782 | n2s(data, idsize); | |
783 | dsize -= 2 + idsize; | |
784 | if (dsize < 0) | |
785 | { | |
786 | *al = SSL_AD_DECODE_ERROR; | |
787 | return 0; | |
788 | } | |
789 | sdata = data; | |
790 | data += idsize; | |
791 | id = d2i_OCSP_RESPID(NULL, | |
792 | &sdata, idsize); | |
793 | if (!id) | |
794 | { | |
795 | *al = SSL_AD_DECODE_ERROR; | |
796 | return 0; | |
797 | } | |
798 | if (data != sdata) | |
799 | { | |
800 | OCSP_RESPID_free(id); | |
801 | *al = SSL_AD_DECODE_ERROR; | |
802 | return 0; | |
803 | } | |
804 | if (!s->tlsext_ocsp_ids | |
805 | && !(s->tlsext_ocsp_ids = | |
806 | sk_OCSP_RESPID_new_null())) | |
807 | { | |
808 | OCSP_RESPID_free(id); | |
809 | *al = SSL_AD_INTERNAL_ERROR; | |
810 | return 0; | |
811 | } | |
812 | if (!sk_OCSP_RESPID_push( | |
813 | s->tlsext_ocsp_ids, id)) | |
814 | { | |
815 | OCSP_RESPID_free(id); | |
816 | *al = SSL_AD_INTERNAL_ERROR; | |
817 | return 0; | |
818 | } | |
819 | } | |
820 | ||
821 | /* Read in request_extensions */ | |
822 | n2s(data,dsize); | |
823 | size -= 2; | |
824 | if (dsize > size) | |
825 | { | |
826 | *al = SSL_AD_DECODE_ERROR; | |
827 | return 0; | |
828 | } | |
829 | sdata = data; | |
830 | if (dsize > 0) | |
831 | { | |
832 | s->tlsext_ocsp_exts = | |
833 | d2i_X509_EXTENSIONS(NULL, | |
834 | &sdata, dsize); | |
835 | if (!s->tlsext_ocsp_exts | |
836 | || (data + dsize != sdata)) | |
837 | { | |
838 | *al = SSL_AD_DECODE_ERROR; | |
839 | return 0; | |
840 | } | |
841 | } | |
842 | } | |
843 | /* We don't know what to do with any other type | |
844 | * so ignore it. | |
845 | */ | |
846 | else | |
847 | s->tlsext_status_type = -1; | |
848 | } | |
761772d7 | 849 | |
6434abbf DSH |
850 | /* session ticket processed earlier */ |
851 | data+=size; | |
f1fd4544 | 852 | } |
6434abbf | 853 | |
f1fd4544 BM |
854 | *p = data; |
855 | return 1; | |
52b8dad8 | 856 | } |
f1fd4544 BM |
857 | |
858 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) | |
859 | { | |
ed3883d2 BM |
860 | unsigned short type; |
861 | unsigned short size; | |
862 | unsigned short len; | |
863 | unsigned char *data = *p; | |
864 | ||
865 | int tlsext_servername = 0; | |
866 | ||
867 | if (data >= (d+n-2)) | |
f1fd4544 | 868 | return 1; |
ed3883d2 BM |
869 | |
870 | n2s(data,len); | |
871 | ||
f1fd4544 BM |
872 | while(data <= (d+n-4)) |
873 | { | |
ed3883d2 BM |
874 | n2s(data,type); |
875 | n2s(data,size); | |
876 | ||
877 | if (data+size > (d+n)) | |
f1fd4544 BM |
878 | return 1; |
879 | ||
6434abbf DSH |
880 | if (s->tlsext_debug_cb) |
881 | s->tlsext_debug_cb(s, 1, type, data, size, | |
882 | s->tlsext_debug_arg); | |
883 | ||
f1fd4544 BM |
884 | if (type == TLSEXT_TYPE_server_name) |
885 | { | |
886 | if (s->tlsext_hostname == NULL || size > 0) | |
887 | { | |
888 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
889 | return 0; | |
890 | } | |
ed3883d2 | 891 | tlsext_servername = 1; |
f1fd4544 | 892 | } |
ed3883d2 | 893 | |
36ca4ba6 BM |
894 | #ifndef OPENSSL_NO_EC |
895 | else if (type == TLSEXT_TYPE_ec_point_formats) | |
896 | { | |
897 | unsigned char *sdata = data; | |
898 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
899 | |
900 | if (ecpointformatlist_length != size - 1) | |
901 | { | |
902 | *al = TLS1_AD_DECODE_ERROR; | |
903 | return 0; | |
904 | } | |
905 | s->session->tlsext_ecpointformatlist_length = 0; | |
b6acb8d0 | 906 | if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); |
36ca4ba6 BM |
907 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) |
908 | { | |
909 | *al = TLS1_AD_INTERNAL_ERROR; | |
910 | return 0; | |
911 | } | |
912 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
913 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
914 | #if 0 | |
915 | fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); | |
916 | sdata = s->session->tlsext_ecpointformatlist; | |
917 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
918 | fprintf(stderr,"%i ",*(sdata++)); | |
919 | fprintf(stderr,"\n"); | |
920 | #endif | |
921 | } | |
c6a27f01 | 922 | #endif /* OPENSSL_NO_EC */ |
6434abbf DSH |
923 | |
924 | else if (type == TLSEXT_TYPE_session_ticket) | |
925 | { | |
926 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) | |
927 | || (size > 0)) | |
928 | { | |
929 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
930 | return 0; | |
931 | } | |
932 | s->tlsext_ticket_expected = 1; | |
933 | } | |
761772d7 BM |
934 | #ifdef TLSEXT_TYPE_opaque_prf_input |
935 | else if (type == TLSEXT_TYPE_opaque_prf_input) | |
936 | { | |
937 | unsigned char *sdata = data; | |
938 | ||
939 | if (size < 2) | |
940 | { | |
941 | *al = SSL_AD_DECODE_ERROR; | |
942 | return 0; | |
943 | } | |
944 | n2s(sdata, s->s3->server_opaque_prf_input_len); | |
945 | if (s->s3->server_opaque_prf_input_len != size - 2) | |
946 | { | |
947 | *al = SSL_AD_DECODE_ERROR; | |
948 | return 0; | |
949 | } | |
950 | ||
951 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
952 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
02c27b11 BM |
953 | if (s->s3->server_opaque_prf_input_len == 0) |
954 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
955 | else | |
956 | s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); | |
761772d7 BM |
957 | |
958 | if (s->s3->server_opaque_prf_input == NULL) | |
959 | { | |
960 | *al = TLS1_AD_INTERNAL_ERROR; | |
961 | return 0; | |
962 | } | |
963 | } | |
964 | #endif | |
67c8e7f4 DSH |
965 | else if (type == TLSEXT_TYPE_status_request) |
966 | { | |
967 | /* MUST be empty and only sent if we've requested | |
968 | * a status request message. | |
969 | */ | |
970 | if ((s->tlsext_status_type == -1) || (size > 0)) | |
971 | { | |
972 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
973 | return 0; | |
974 | } | |
975 | /* Set flag to expect CertificateStatus message */ | |
976 | s->tlsext_status_expected = 1; | |
977 | } | |
761772d7 | 978 | |
ed3883d2 | 979 | data+=size; |
f1fd4544 | 980 | } |
ed3883d2 BM |
981 | |
982 | if (data != d+n) | |
f1fd4544 BM |
983 | { |
984 | *al = SSL_AD_DECODE_ERROR; | |
985 | return 0; | |
986 | } | |
ed3883d2 | 987 | |
f1fd4544 BM |
988 | if (!s->hit && tlsext_servername == 1) |
989 | { | |
990 | if (s->tlsext_hostname) | |
991 | { | |
992 | if (s->session->tlsext_hostname == NULL) | |
993 | { | |
ed3883d2 BM |
994 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); |
995 | if (!s->session->tlsext_hostname) | |
f1fd4544 BM |
996 | { |
997 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
998 | return 0; | |
999 | } | |
1000 | } | |
1001 | else | |
1002 | { | |
1003 | *al = SSL_AD_DECODE_ERROR; | |
1004 | return 0; | |
1005 | } | |
ed3883d2 | 1006 | } |
f1fd4544 | 1007 | } |
ed3883d2 | 1008 | |
f1fd4544 BM |
1009 | *p = data; |
1010 | return 1; | |
52b8dad8 | 1011 | } |
ed3883d2 | 1012 | |
b2172f4f | 1013 | |
36ca4ba6 BM |
1014 | int ssl_prepare_clienthello_tlsext(SSL *s) |
1015 | { | |
1016 | #ifndef OPENSSL_NO_EC | |
33273721 BM |
1017 | /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats |
1018 | * and elliptic curves we support. | |
36ca4ba6 BM |
1019 | */ |
1020 | int using_ecc = 0; | |
1021 | int i; | |
33273721 | 1022 | unsigned char *j; |
52b8dad8 | 1023 | unsigned long alg_k, alg_a; |
36ca4ba6 | 1024 | STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); |
52b8dad8 | 1025 | |
36ca4ba6 BM |
1026 | for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) |
1027 | { | |
52b8dad8 BM |
1028 | SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); |
1029 | ||
1030 | alg_k = c->algorithm_mkey; | |
1031 | alg_a = c->algorithm_auth; | |
1032 | if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) | |
36ca4ba6 BM |
1033 | { |
1034 | using_ecc = 1; | |
1035 | break; | |
1036 | } | |
36ca4ba6 BM |
1037 | } |
1038 | using_ecc = using_ecc && (s->version == TLS1_VERSION); | |
1039 | if (using_ecc) | |
1040 | { | |
b6acb8d0 BM |
1041 | if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); |
1042 | if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) | |
36ca4ba6 | 1043 | { |
a291745e | 1044 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); |
36ca4ba6 BM |
1045 | return -1; |
1046 | } | |
b6acb8d0 BM |
1047 | s->tlsext_ecpointformatlist_length = 3; |
1048 | s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; | |
1049 | s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
1050 | s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
b2172f4f | 1051 | |
33273721 BM |
1052 | /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ |
1053 | if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); | |
b2172f4f BM |
1054 | s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2; |
1055 | if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) | |
33273721 | 1056 | { |
b2172f4f | 1057 | s->tlsext_ellipticcurvelist_length = 0; |
a291745e | 1058 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); |
33273721 BM |
1059 | return -1; |
1060 | } | |
b2172f4f BM |
1061 | for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++) |
1062 | s2n(i,j); | |
36ca4ba6 BM |
1063 | } |
1064 | #endif /* OPENSSL_NO_EC */ | |
761772d7 BM |
1065 | |
1066 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
1067 | { | |
1068 | int r = 1; | |
1069 | ||
1070 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
1071 | { | |
1072 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
1073 | if (!r) | |
1074 | return -1; | |
1075 | } | |
1076 | ||
1077 | if (s->tlsext_opaque_prf_input != NULL) | |
1078 | { | |
1079 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1080 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
1081 | ||
02c27b11 BM |
1082 | if (s->tlsext_opaque_prf_input_len == 0) |
1083 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1084 | else | |
1085 | s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
1086 | if (s->s3->client_opaque_prf_input == NULL) |
1087 | { | |
1088 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); | |
1089 | return -1; | |
1090 | } | |
1091 | s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
1092 | } | |
1093 | ||
1094 | if (r == 2) | |
1095 | /* at callback's request, insist on receiving an appropriate server opaque PRF input */ | |
1096 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
1097 | } | |
1098 | #endif | |
1099 | ||
36ca4ba6 | 1100 | return 1; |
52b8dad8 | 1101 | } |
36ca4ba6 BM |
1102 | |
1103 | int ssl_prepare_serverhello_tlsext(SSL *s) | |
1104 | { | |
1105 | #ifndef OPENSSL_NO_EC | |
b6acb8d0 | 1106 | /* If we are server and using an ECC cipher suite, send the point formats we support |
33273721 BM |
1107 | * if the client sent us an ECPointsFormat extension. Note that the server is not |
1108 | * supposed to send an EllipticCurves extension. | |
36ca4ba6 | 1109 | */ |
36ca4ba6 | 1110 | |
52b8dad8 BM |
1111 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
1112 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
1113 | int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); | |
1114 | using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); | |
1115 | ||
36ca4ba6 BM |
1116 | if (using_ecc) |
1117 | { | |
b6acb8d0 BM |
1118 | if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); |
1119 | if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) | |
36ca4ba6 | 1120 | { |
a291745e | 1121 | SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); |
36ca4ba6 BM |
1122 | return -1; |
1123 | } | |
b6acb8d0 BM |
1124 | s->tlsext_ecpointformatlist_length = 3; |
1125 | s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; | |
1126 | s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
1127 | s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
36ca4ba6 BM |
1128 | } |
1129 | #endif /* OPENSSL_NO_EC */ | |
761772d7 | 1130 | |
36ca4ba6 | 1131 | return 1; |
52b8dad8 | 1132 | } |
36ca4ba6 BM |
1133 | |
1134 | int ssl_check_clienthello_tlsext(SSL *s) | |
f1fd4544 | 1135 | { |
241520e6 | 1136 | int ret=SSL_TLSEXT_ERR_NOACK; |
36ca4ba6 BM |
1137 | int al = SSL_AD_UNRECOGNIZED_NAME; |
1138 | ||
1139 | #ifndef OPENSSL_NO_EC | |
33273721 BM |
1140 | /* The handling of the ECPointFormats extension is done elsewhere, namely in |
1141 | * ssl3_choose_cipher in s3_lib.c. | |
1142 | */ | |
1143 | /* The handling of the EllipticCurves extension is done elsewhere, namely in | |
1144 | * ssl3_choose_cipher in s3_lib.c. | |
36ca4ba6 BM |
1145 | */ |
1146 | #endif | |
1147 | ||
1148 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
1149 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
1150 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
1151 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
1152 | ||
67c8e7f4 DSH |
1153 | /* If status request then ask callback what to do. |
1154 | * Note: this must be called after servername callbacks in case | |
1155 | * the certificate has changed. | |
1156 | */ | |
1157 | if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb) | |
1158 | { | |
1159 | int r; | |
1160 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
1161 | switch (r) | |
1162 | { | |
1163 | /* We don't want to send a status request response */ | |
1164 | case SSL_TLSEXT_ERR_NOACK: | |
1165 | s->tlsext_status_expected = 0; | |
1166 | break; | |
1167 | /* status request response should be sent */ | |
1168 | case SSL_TLSEXT_ERR_OK: | |
1169 | if (s->tlsext_ocsp_resp) | |
1170 | s->tlsext_status_expected = 1; | |
1171 | else | |
1172 | s->tlsext_status_expected = 0; | |
1173 | break; | |
1174 | /* something bad happened */ | |
1175 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
1176 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1177 | al = SSL_AD_INTERNAL_ERROR; | |
1178 | goto err; | |
1179 | } | |
1180 | } | |
1181 | else | |
1182 | s->tlsext_status_expected = 0; | |
761772d7 BM |
1183 | |
1184 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
1185 | { | |
1186 | /* This sort of belongs into ssl_prepare_serverhello_tlsext(), | |
1187 | * but we might be sending an alert in response to the client hello, | |
1188 | * so this has to happen here in ssl_check_clienthello_tlsext(). */ | |
1189 | ||
1190 | int r = 1; | |
1191 | ||
1192 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
1193 | { | |
1194 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
1195 | if (!r) | |
1196 | { | |
1197 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1198 | al = SSL_AD_INTERNAL_ERROR; | |
1199 | goto err; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1204 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
1205 | s->s3->server_opaque_prf_input = NULL; | |
1206 | ||
1207 | if (s->tlsext_opaque_prf_input != NULL) | |
1208 | { | |
1209 | if (s->s3->client_opaque_prf_input != NULL && | |
1210 | s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) | |
1211 | { | |
1212 | /* can only use this extension if we have a server opaque PRF input | |
1213 | * of the same length as the client opaque PRF input! */ | |
1214 | ||
02c27b11 BM |
1215 | if (s->tlsext_opaque_prf_input_len == 0) |
1216 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1217 | else | |
1218 | s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
1219 | if (s->s3->server_opaque_prf_input == NULL) |
1220 | { | |
1221 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1222 | al = SSL_AD_INTERNAL_ERROR; | |
1223 | goto err; | |
1224 | } | |
1225 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | if (r == 2 && s->s3->server_opaque_prf_input == NULL) | |
1230 | { | |
1231 | /* The callback wants to enforce use of the extension, | |
1232 | * but we can't do that with the client opaque PRF input; | |
1233 | * abort the handshake. | |
1234 | */ | |
1235 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1236 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1237 | } | |
1238 | } | |
761772d7 | 1239 | |
67c8e7f4 | 1240 | #endif |
761772d7 | 1241 | err: |
52b8dad8 BM |
1242 | switch (ret) |
1243 | { | |
36ca4ba6 BM |
1244 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
1245 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1246 | return -1; | |
1247 | ||
1248 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
1249 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
1250 | return 1; | |
1251 | ||
1252 | case SSL_TLSEXT_ERR_NOACK: | |
1253 | s->servername_done=0; | |
1254 | default: | |
1255 | return 1; | |
52b8dad8 | 1256 | } |
36ca4ba6 | 1257 | } |
f1fd4544 | 1258 | |
36ca4ba6 BM |
1259 | int ssl_check_serverhello_tlsext(SSL *s) |
1260 | { | |
1261 | int ret=SSL_TLSEXT_ERR_NOACK; | |
58ece833 | 1262 | int al = SSL_AD_UNRECOGNIZED_NAME; |
241520e6 | 1263 | |
36ca4ba6 BM |
1264 | #ifndef OPENSSL_NO_EC |
1265 | /* If we are client and using an elliptic curve cryptography cipher suite, then server | |
1266 | * must return a an EC point formats lists containing uncompressed. | |
1267 | */ | |
52b8dad8 BM |
1268 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
1269 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
36ca4ba6 | 1270 | if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && |
52b8dad8 | 1271 | ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) |
36ca4ba6 BM |
1272 | { |
1273 | /* we are using an ECC cipher */ | |
90bdfd97 | 1274 | size_t i; |
36ca4ba6 BM |
1275 | unsigned char *list; |
1276 | int found_uncompressed = 0; | |
a4ff3925 | 1277 | if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0)) |
36ca4ba6 | 1278 | { |
a291745e | 1279 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
36ca4ba6 BM |
1280 | return -1; |
1281 | } | |
b9865f11 | 1282 | list = s->session->tlsext_ecpointformatlist; |
36ca4ba6 BM |
1283 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) |
1284 | { | |
1285 | if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) | |
1286 | { | |
1287 | found_uncompressed = 1; | |
1288 | break; | |
1289 | } | |
1290 | } | |
1291 | if (!found_uncompressed) | |
1292 | { | |
a291745e | 1293 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
36ca4ba6 BM |
1294 | return -1; |
1295 | } | |
1296 | } | |
1297 | ret = SSL_TLSEXT_ERR_OK; | |
1298 | #endif /* OPENSSL_NO_EC */ | |
1299 | ||
241520e6 | 1300 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) |
58ece833 | 1301 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); |
241520e6 | 1302 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) |
58ece833 | 1303 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); |
241520e6 | 1304 | |
761772d7 BM |
1305 | #ifdef TLSEXT_TYPE_opaque_prf_input |
1306 | if (s->s3->server_opaque_prf_input_len > 0) | |
1307 | { | |
1308 | /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. | |
1309 | * So first verify that we really have a value from the server too. */ | |
1310 | ||
1311 | if (s->s3->server_opaque_prf_input == NULL) | |
1312 | { | |
1313 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1314 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1315 | } | |
1316 | ||
1317 | /* Anytime the server *has* sent an opaque PRF input, we need to check | |
1318 | * that we have a client opaque PRF input of the same size. */ | |
1319 | if (s->s3->client_opaque_prf_input == NULL || | |
1320 | s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) | |
1321 | { | |
1322 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1323 | al = SSL_AD_ILLEGAL_PARAMETER; | |
1324 | } | |
1325 | } | |
1326 | #endif | |
1327 | ||
04e2ab2c DSH |
1328 | /* If we've requested certificate status and we wont get one |
1329 | * tell the callback | |
1330 | */ | |
1331 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
1332 | && s->ctx->tlsext_status_cb) | |
1333 | { | |
1334 | int r; | |
1335 | /* Set resp to NULL, resplen to -1 so callback knows | |
1336 | * there is no response. | |
1337 | */ | |
1338 | if (s->tlsext_ocsp_resp) | |
1339 | { | |
1340 | OPENSSL_free(s->tlsext_ocsp_resp); | |
1341 | s->tlsext_ocsp_resp = NULL; | |
1342 | } | |
1343 | s->tlsext_ocsp_resplen = -1; | |
1344 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
1345 | if (r == 0) | |
1346 | { | |
1347 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
1348 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1349 | } | |
1350 | if (r < 0) | |
1351 | { | |
1352 | al = SSL_AD_INTERNAL_ERROR; | |
1353 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
1354 | } | |
1355 | } | |
1356 | ||
52b8dad8 BM |
1357 | switch (ret) |
1358 | { | |
58ece833 BM |
1359 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
1360 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1361 | return -1; | |
1362 | ||
1363 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
1364 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
1365 | return 1; | |
1366 | ||
1367 | case SSL_TLSEXT_ERR_NOACK: | |
1368 | s->servername_done=0; | |
1369 | default: | |
1370 | return 1; | |
52b8dad8 | 1371 | } |
f1fd4544 | 1372 | } |
33273721 | 1373 | |
6434abbf DSH |
1374 | /* Since the server cache lookup is done early on in the processing of client |
1375 | * hello and other operations depend on the result we need to handle any TLS | |
1376 | * session ticket extension at the same time. | |
1377 | */ | |
1378 | ||
1379 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, | |
1380 | const unsigned char *limit, SSL_SESSION **ret) | |
1381 | { | |
1382 | /* Point after session ID in client hello */ | |
1383 | const unsigned char *p = session_id + len; | |
1384 | unsigned short i; | |
1385 | if ((s->version <= SSL3_VERSION) || !limit) | |
1386 | return 1; | |
1387 | if (p >= limit) | |
1388 | return -1; | |
1389 | /* Skip past cipher list */ | |
1390 | n2s(p, i); | |
1391 | p+= i; | |
1392 | if (p >= limit) | |
1393 | return -1; | |
1394 | /* Skip past compression algorithm list */ | |
1395 | i = *(p++); | |
1396 | p += i; | |
1397 | if (p > limit) | |
1398 | return -1; | |
1399 | /* Now at start of extensions */ | |
1400 | if ((p + 2) >= limit) | |
1401 | return 1; | |
1402 | n2s(p, i); | |
1403 | while ((p + 4) <= limit) | |
1404 | { | |
1405 | unsigned short type, size; | |
1406 | n2s(p, type); | |
1407 | n2s(p, size); | |
1408 | if (p + size > limit) | |
1409 | return 1; | |
1410 | if (type == TLSEXT_TYPE_session_ticket) | |
1411 | { | |
1412 | /* If tickets disabled indicate cache miss which will | |
1413 | * trigger a full handshake | |
1414 | */ | |
1415 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) | |
1416 | return 0; | |
1417 | /* If zero length not client will accept a ticket | |
1418 | * and indicate cache miss to trigger full handshake | |
1419 | */ | |
1420 | if (size == 0) | |
1421 | { | |
1422 | s->tlsext_ticket_expected = 1; | |
1423 | return 0; /* Cache miss */ | |
1424 | } | |
1425 | return tls_decrypt_ticket(s, p, size, session_id, len, | |
1426 | ret); | |
1427 | } | |
1428 | p += size; | |
1429 | } | |
1430 | return 1; | |
1431 | } | |
1432 | ||
1433 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, | |
1434 | const unsigned char *sess_id, int sesslen, | |
1435 | SSL_SESSION **psess) | |
1436 | { | |
1437 | SSL_SESSION *sess; | |
1438 | unsigned char *sdec; | |
1439 | const unsigned char *p; | |
1440 | int slen, mlen; | |
1441 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; | |
1442 | HMAC_CTX hctx; | |
1443 | EVP_CIPHER_CTX ctx; | |
1444 | /* Attempt to process session ticket, first conduct sanity and | |
1445 | * integrity checks on ticket. | |
1446 | */ | |
956006b7 | 1447 | mlen = EVP_MD_size(tlsext_tick_md()); |
6434abbf DSH |
1448 | eticklen -= mlen; |
1449 | /* Need at least keyname + iv + some encrypted data */ | |
1450 | if (eticklen < 48) | |
1451 | goto tickerr; | |
1452 | /* Check key name matches */ | |
1453 | if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16)) | |
1454 | goto tickerr; | |
6434abbf DSH |
1455 | /* Check HMAC of encrypted ticket */ |
1456 | HMAC_CTX_init(&hctx); | |
1457 | HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16, | |
956006b7 | 1458 | tlsext_tick_md(), NULL); |
6434abbf DSH |
1459 | HMAC_Update(&hctx, etick, eticklen); |
1460 | HMAC_Final(&hctx, tick_hmac, NULL); | |
1461 | HMAC_CTX_cleanup(&hctx); | |
1462 | if (memcmp(tick_hmac, etick + eticklen, mlen)) | |
1463 | goto tickerr; | |
6434abbf DSH |
1464 | /* Set p to start of IV */ |
1465 | p = etick + 16; | |
1466 | EVP_CIPHER_CTX_init(&ctx); | |
1467 | /* Attempt to decrypt session data */ | |
1468 | EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
1469 | s->ctx->tlsext_tick_aes_key, p); | |
1470 | /* Move p after IV to start of encrypted ticket, update length */ | |
1471 | p += 16; | |
1472 | eticklen -= 32; | |
1473 | sdec = OPENSSL_malloc(eticklen); | |
1474 | if (!sdec) | |
1475 | { | |
1476 | EVP_CIPHER_CTX_cleanup(&ctx); | |
1477 | return -1; | |
1478 | } | |
1479 | EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); | |
1480 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) | |
1481 | goto tickerr; | |
6434abbf DSH |
1482 | slen += mlen; |
1483 | EVP_CIPHER_CTX_cleanup(&ctx); | |
1484 | p = sdec; | |
1485 | ||
1486 | sess = d2i_SSL_SESSION(NULL, &p, slen); | |
1487 | OPENSSL_free(sdec); | |
1488 | if (sess) | |
1489 | { | |
1490 | /* The session ID if non-empty is used by some clients to | |
1491 | * detect that the ticket has been accepted. So we copy it to | |
1492 | * the session structure. If it is empty set length to zero | |
1493 | * as required by standard. | |
1494 | */ | |
1495 | if (sesslen) | |
1496 | memcpy(sess->session_id, sess_id, sesslen); | |
1497 | sess->session_id_length = sesslen; | |
1498 | *psess = sess; | |
76c3ef74 | 1499 | s->tlsext_ticket_expected = 0; |
6434abbf DSH |
1500 | return 1; |
1501 | } | |
1502 | /* If session decrypt failure indicate a cache miss and set state to | |
1503 | * send a new ticket | |
1504 | */ | |
1505 | tickerr: | |
1506 | s->tlsext_ticket_expected = 1; | |
1507 | return 0; | |
1508 | } | |
6434abbf DSH |
1509 | |
1510 | #endif |