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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> |
4817504d | 117 | #include <openssl/rand.h> |
58964a49 RE |
118 | #include "ssl_locl.h" |
119 | ||
42182852 | 120 | const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; |
58964a49 | 121 | |
367eb1f1 | 122 | #ifndef OPENSSL_NO_TLSEXT |
6434abbf DSH |
123 | static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, |
124 | const unsigned char *sess_id, int sesslen, | |
125 | SSL_SESSION **psess); | |
367eb1f1 | 126 | #endif |
6434abbf | 127 | |
f3b656b2 | 128 | SSL3_ENC_METHOD TLSv1_enc_data={ |
58964a49 RE |
129 | tls1_enc, |
130 | tls1_mac, | |
131 | tls1_setup_key_block, | |
132 | tls1_generate_master_secret, | |
133 | tls1_change_cipher_state, | |
134 | tls1_final_finish_mac, | |
135 | TLS1_FINISH_MAC_LENGTH, | |
136 | tls1_cert_verify_mac, | |
137 | TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
138 | TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, | |
139 | tls1_alert_code, | |
e0af0405 | 140 | tls1_export_keying_material, |
58964a49 RE |
141 | }; |
142 | ||
f3b656b2 | 143 | long tls1_default_timeout(void) |
58964a49 RE |
144 | { |
145 | /* 2 hours, the 24 hours mentioned in the TLSv1 spec | |
146 | * is way too long for http, the cache would over fill */ | |
147 | return(60*60*2); | |
148 | } | |
149 | ||
6b691a5c | 150 | int tls1_new(SSL *s) |
58964a49 RE |
151 | { |
152 | if (!ssl3_new(s)) return(0); | |
153 | s->method->ssl_clear(s); | |
154 | return(1); | |
155 | } | |
156 | ||
6b691a5c | 157 | void tls1_free(SSL *s) |
58964a49 | 158 | { |
12bf56c0 DSH |
159 | #ifndef OPENSSL_NO_TLSEXT |
160 | if (s->tlsext_session_ticket) | |
161 | { | |
162 | OPENSSL_free(s->tlsext_session_ticket); | |
163 | } | |
164 | #endif /* OPENSSL_NO_TLSEXT */ | |
58964a49 RE |
165 | ssl3_free(s); |
166 | } | |
167 | ||
6b691a5c | 168 | void tls1_clear(SSL *s) |
58964a49 RE |
169 | { |
170 | ssl3_clear(s); | |
637f374a | 171 | s->version = s->method->version; |
58964a49 RE |
172 | } |
173 | ||
525de5d3 | 174 | #ifndef OPENSSL_NO_EC |
eda3766b | 175 | |
525de5d3 DSH |
176 | static int nid_list[] = |
177 | { | |
178 | NID_sect163k1, /* sect163k1 (1) */ | |
179 | NID_sect163r1, /* sect163r1 (2) */ | |
180 | NID_sect163r2, /* sect163r2 (3) */ | |
181 | NID_sect193r1, /* sect193r1 (4) */ | |
182 | NID_sect193r2, /* sect193r2 (5) */ | |
183 | NID_sect233k1, /* sect233k1 (6) */ | |
184 | NID_sect233r1, /* sect233r1 (7) */ | |
185 | NID_sect239k1, /* sect239k1 (8) */ | |
186 | NID_sect283k1, /* sect283k1 (9) */ | |
187 | NID_sect283r1, /* sect283r1 (10) */ | |
188 | NID_sect409k1, /* sect409k1 (11) */ | |
189 | NID_sect409r1, /* sect409r1 (12) */ | |
190 | NID_sect571k1, /* sect571k1 (13) */ | |
191 | NID_sect571r1, /* sect571r1 (14) */ | |
192 | NID_secp160k1, /* secp160k1 (15) */ | |
193 | NID_secp160r1, /* secp160r1 (16) */ | |
194 | NID_secp160r2, /* secp160r2 (17) */ | |
195 | NID_secp192k1, /* secp192k1 (18) */ | |
196 | NID_X9_62_prime192v1, /* secp192r1 (19) */ | |
197 | NID_secp224k1, /* secp224k1 (20) */ | |
198 | NID_secp224r1, /* secp224r1 (21) */ | |
199 | NID_secp256k1, /* secp256k1 (22) */ | |
200 | NID_X9_62_prime256v1, /* secp256r1 (23) */ | |
201 | NID_secp384r1, /* secp384r1 (24) */ | |
202 | NID_secp521r1 /* secp521r1 (25) */ | |
203 | }; | |
eda3766b | 204 | |
d0595f17 DSH |
205 | |
206 | static const unsigned char ecformats_default[] = | |
eda3766b | 207 | { |
d0595f17 DSH |
208 | TLSEXT_ECPOINTFORMAT_uncompressed, |
209 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime, | |
210 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 | |
211 | }; | |
212 | ||
213 | static const unsigned char eccurves_default[] = | |
214 | { | |
215 | 0,14, /* sect571r1 (14) */ | |
216 | 0,13, /* sect571k1 (13) */ | |
217 | 0,25, /* secp521r1 (25) */ | |
218 | 0,11, /* sect409k1 (11) */ | |
219 | 0,12, /* sect409r1 (12) */ | |
220 | 0,24, /* secp384r1 (24) */ | |
221 | 0,9, /* sect283k1 (9) */ | |
222 | 0,10, /* sect283r1 (10) */ | |
223 | 0,22, /* secp256k1 (22) */ | |
224 | 0,23, /* secp256r1 (23) */ | |
225 | 0,8, /* sect239k1 (8) */ | |
226 | 0,6, /* sect233k1 (6) */ | |
227 | 0,7, /* sect233r1 (7) */ | |
228 | 0,20, /* secp224k1 (20) */ | |
229 | 0,21, /* secp224r1 (21) */ | |
230 | 0,4, /* sect193r1 (4) */ | |
231 | 0,5, /* sect193r2 (5) */ | |
232 | 0,18, /* secp192k1 (18) */ | |
233 | 0,19, /* secp192r1 (19) */ | |
234 | 0,1, /* sect163k1 (1) */ | |
235 | 0,2, /* sect163r1 (2) */ | |
236 | 0,3, /* sect163r2 (3) */ | |
237 | 0,15, /* secp160k1 (15) */ | |
238 | 0,16, /* secp160r1 (16) */ | |
239 | 0,17, /* secp160r2 (17) */ | |
eda3766b DSH |
240 | }; |
241 | ||
525de5d3 DSH |
242 | int tls1_ec_curve_id2nid(int curve_id) |
243 | { | |
244 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
1e26a8ba GT |
245 | if ((curve_id < 1) || ((unsigned int)curve_id > |
246 | sizeof(nid_list)/sizeof(nid_list[0]))) | |
247 | return 0; | |
525de5d3 DSH |
248 | return nid_list[curve_id-1]; |
249 | } | |
250 | ||
251 | int tls1_ec_nid2curve_id(int nid) | |
252 | { | |
253 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
254 | switch (nid) | |
255 | { | |
256 | case NID_sect163k1: /* sect163k1 (1) */ | |
257 | return 1; | |
258 | case NID_sect163r1: /* sect163r1 (2) */ | |
259 | return 2; | |
260 | case NID_sect163r2: /* sect163r2 (3) */ | |
261 | return 3; | |
262 | case NID_sect193r1: /* sect193r1 (4) */ | |
263 | return 4; | |
264 | case NID_sect193r2: /* sect193r2 (5) */ | |
265 | return 5; | |
266 | case NID_sect233k1: /* sect233k1 (6) */ | |
267 | return 6; | |
268 | case NID_sect233r1: /* sect233r1 (7) */ | |
269 | return 7; | |
270 | case NID_sect239k1: /* sect239k1 (8) */ | |
271 | return 8; | |
272 | case NID_sect283k1: /* sect283k1 (9) */ | |
273 | return 9; | |
274 | case NID_sect283r1: /* sect283r1 (10) */ | |
275 | return 10; | |
276 | case NID_sect409k1: /* sect409k1 (11) */ | |
277 | return 11; | |
278 | case NID_sect409r1: /* sect409r1 (12) */ | |
279 | return 12; | |
280 | case NID_sect571k1: /* sect571k1 (13) */ | |
281 | return 13; | |
282 | case NID_sect571r1: /* sect571r1 (14) */ | |
283 | return 14; | |
284 | case NID_secp160k1: /* secp160k1 (15) */ | |
285 | return 15; | |
286 | case NID_secp160r1: /* secp160r1 (16) */ | |
287 | return 16; | |
288 | case NID_secp160r2: /* secp160r2 (17) */ | |
289 | return 17; | |
290 | case NID_secp192k1: /* secp192k1 (18) */ | |
291 | return 18; | |
292 | case NID_X9_62_prime192v1: /* secp192r1 (19) */ | |
293 | return 19; | |
294 | case NID_secp224k1: /* secp224k1 (20) */ | |
295 | return 20; | |
296 | case NID_secp224r1: /* secp224r1 (21) */ | |
297 | return 21; | |
298 | case NID_secp256k1: /* secp256k1 (22) */ | |
299 | return 22; | |
300 | case NID_X9_62_prime256v1: /* secp256r1 (23) */ | |
301 | return 23; | |
302 | case NID_secp384r1: /* secp384r1 (24) */ | |
303 | return 24; | |
304 | case NID_secp521r1: /* secp521r1 (25) */ | |
305 | return 25; | |
306 | default: | |
307 | return 0; | |
308 | } | |
309 | } | |
fd2b65ce DSH |
310 | /* Get curves list, if "sess" is set return client curves otherwise |
311 | * preferred list | |
312 | */ | |
313 | static void tls1_get_curvelist(SSL *s, int sess, | |
314 | const unsigned char **pcurves, | |
315 | size_t *pcurveslen) | |
316 | { | |
317 | if (sess) | |
318 | { | |
319 | *pcurves = s->session->tlsext_ellipticcurvelist; | |
320 | *pcurveslen = s->session->tlsext_ellipticcurvelist_length; | |
321 | } | |
322 | else | |
323 | { | |
324 | *pcurves = s->tlsext_ellipticcurvelist; | |
325 | *pcurveslen = s->tlsext_ellipticcurvelist_length; | |
326 | } | |
327 | /* If not set use default: for now static structure */ | |
328 | if (!*pcurves) | |
329 | { | |
330 | *pcurves = eccurves_default; | |
331 | *pcurveslen = sizeof(eccurves_default); | |
332 | } | |
333 | } | |
d0595f17 | 334 | |
a4352630 DSH |
335 | /* Return nth shared curve. If nmatch == -1 return number of |
336 | * matches. | |
d0595f17 | 337 | */ |
a4352630 DSH |
338 | |
339 | int tls1_shared_curve(SSL *s, int nmatch) | |
d0595f17 DSH |
340 | { |
341 | const unsigned char *pref, *supp; | |
342 | size_t preflen, supplen, i, j; | |
343 | int k; | |
a4352630 DSH |
344 | /* Can't do anything on client side */ |
345 | if (s->server == 0) | |
346 | return -1; | |
347 | tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), | |
348 | &supp, &supplen); | |
349 | tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), | |
350 | &pref, &preflen); | |
351 | preflen /= 2; | |
352 | supplen /= 2; | |
d0595f17 DSH |
353 | k = 0; |
354 | for (i = 0; i < preflen; i++, pref+=2) | |
355 | { | |
356 | const unsigned char *tsupp = supp; | |
357 | for (j = 0; j < supplen; j++, tsupp+=2) | |
358 | { | |
359 | if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) | |
360 | { | |
361 | if (nmatch == k) | |
a4352630 DSH |
362 | { |
363 | int id = (pref[0] << 8) | pref[1]; | |
364 | return tls1_ec_curve_id2nid(id); | |
365 | } | |
d0595f17 DSH |
366 | k++; |
367 | } | |
368 | } | |
369 | } | |
d0595f17 | 370 | if (nmatch == -1) |
a4352630 DSH |
371 | return k; |
372 | return 0; | |
d0595f17 DSH |
373 | } |
374 | ||
375 | int tls1_set_curves(unsigned char **pext, size_t *pextlen, | |
376 | int *curves, size_t ncurves) | |
377 | { | |
378 | unsigned char *clist, *p; | |
379 | size_t i; | |
380 | /* Bitmap of curves included to detect duplicates: only works | |
381 | * while curve ids < 32 | |
382 | */ | |
383 | unsigned long dup_list = 0; | |
384 | clist = OPENSSL_malloc(ncurves * 2); | |
385 | if (!clist) | |
386 | return 0; | |
387 | for (i = 0, p = clist; i < ncurves; i++) | |
388 | { | |
389 | unsigned long idmask; | |
390 | int id; | |
391 | id = tls1_ec_nid2curve_id(curves[i]); | |
392 | idmask = 1L << id; | |
393 | if (!id || (dup_list & idmask)) | |
394 | { | |
395 | OPENSSL_free(clist); | |
396 | return 0; | |
397 | } | |
398 | dup_list |= idmask; | |
399 | s2n(id, p); | |
400 | } | |
401 | if (*pext) | |
402 | OPENSSL_free(*pext); | |
403 | *pext = clist; | |
404 | *pextlen = ncurves * 2; | |
405 | return 1; | |
406 | } | |
407 | ||
408 | #define MAX_CURVELIST 25 | |
409 | ||
410 | typedef struct | |
411 | { | |
412 | size_t nidcnt; | |
413 | int nid_arr[MAX_CURVELIST]; | |
414 | } nid_cb_st; | |
415 | ||
416 | static int nid_cb(const char *elem, int len, void *arg) | |
417 | { | |
418 | nid_cb_st *narg = arg; | |
419 | size_t i; | |
420 | int nid; | |
421 | char etmp[20]; | |
422 | if (narg->nidcnt == MAX_CURVELIST) | |
423 | return 0; | |
424 | if (len > (int)(sizeof(etmp) - 1)) | |
425 | return 0; | |
426 | memcpy(etmp, elem, len); | |
427 | etmp[len] = 0; | |
428 | nid = EC_curve_nist2nid(etmp); | |
429 | if (nid == NID_undef) | |
430 | nid = OBJ_sn2nid(etmp); | |
431 | if (nid == NID_undef) | |
432 | nid = OBJ_ln2nid(etmp); | |
433 | if (nid == NID_undef) | |
434 | return 0; | |
435 | for (i = 0; i < narg->nidcnt; i++) | |
436 | if (narg->nid_arr[i] == nid) | |
437 | return 0; | |
438 | narg->nid_arr[narg->nidcnt++] = nid; | |
439 | return 1; | |
440 | } | |
441 | /* Set curves based on a colon separate list */ | |
442 | int tls1_set_curves_list(unsigned char **pext, size_t *pextlen, | |
443 | const char *str) | |
444 | { | |
445 | nid_cb_st ncb; | |
446 | ncb.nidcnt = 0; | |
447 | if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb)) | |
448 | return 0; | |
449 | return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt); | |
450 | } | |
fd2b65ce DSH |
451 | /* For an EC key set TLS id and required compression based on parameters */ |
452 | static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id, | |
453 | EC_KEY *ec) | |
454 | { | |
455 | int is_prime, id; | |
456 | const EC_GROUP *grp; | |
457 | const EC_POINT *pt; | |
458 | const EC_METHOD *meth; | |
459 | if (!ec) | |
460 | return 0; | |
461 | /* Determine if it is a prime field */ | |
462 | grp = EC_KEY_get0_group(ec); | |
463 | pt = EC_KEY_get0_public_key(ec); | |
464 | if (!grp || !pt) | |
465 | return 0; | |
466 | meth = EC_GROUP_method_of(grp); | |
467 | if (!meth) | |
468 | return 0; | |
469 | if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field) | |
470 | is_prime = 1; | |
471 | else | |
472 | is_prime = 0; | |
473 | /* Determine curve ID */ | |
474 | id = EC_GROUP_get_curve_name(grp); | |
475 | id = tls1_ec_nid2curve_id(id); | |
476 | /* If we have an ID set it, otherwise set arbitrary explicit curve */ | |
477 | if (id) | |
478 | { | |
479 | curve_id[0] = 0; | |
480 | curve_id[1] = (unsigned char)id; | |
481 | } | |
482 | else | |
483 | { | |
484 | curve_id[0] = 0xff; | |
485 | if (is_prime) | |
486 | curve_id[1] = 0x01; | |
487 | else | |
488 | curve_id[1] = 0x02; | |
489 | } | |
490 | if (comp_id) | |
491 | { | |
492 | if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) | |
493 | { | |
494 | if (is_prime) | |
495 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
496 | else | |
497 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
498 | } | |
499 | else | |
500 | *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed; | |
501 | } | |
502 | return 1; | |
503 | } | |
504 | /* Check an EC key is compatible with extensions */ | |
505 | static int tls1_check_ec_key(SSL *s, | |
506 | unsigned char *curve_id, unsigned char *comp_id) | |
507 | { | |
508 | const unsigned char *p; | |
509 | size_t plen, i; | |
a4352630 | 510 | int j; |
fd2b65ce DSH |
511 | /* If point formats extension present check it, otherwise everything |
512 | * is supported (see RFC4492). | |
513 | */ | |
514 | if (comp_id && s->session->tlsext_ecpointformatlist) | |
515 | { | |
516 | p = s->session->tlsext_ecpointformatlist; | |
517 | plen = s->session->tlsext_ecpointformatlist_length; | |
518 | for (i = 0; i < plen; i++, p++) | |
519 | { | |
520 | if (*comp_id == *p) | |
521 | break; | |
522 | } | |
523 | if (i == plen) | |
524 | return 0; | |
525 | } | |
a4352630 DSH |
526 | /* Check curve is consistent with client and server preferences */ |
527 | for (j = 0; j <= 1; j++) | |
fd2b65ce | 528 | { |
a4352630 | 529 | tls1_get_curvelist(s, j, &p, &plen); |
fd2b65ce DSH |
530 | for (i = 0; i < plen; i+=2, p+=2) |
531 | { | |
532 | if (p[0] == curve_id[0] && p[1] == curve_id[1]) | |
a4352630 | 533 | break; |
fd2b65ce | 534 | } |
a4352630 DSH |
535 | if (i == plen) |
536 | return 0; | |
fd2b65ce DSH |
537 | } |
538 | return 1; | |
539 | } | |
540 | /* Check EC server key is compatible with client extensions */ | |
541 | int tls1_check_ec_server_key(SSL *s) | |
542 | { | |
543 | int rv; | |
544 | CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC; | |
545 | EVP_PKEY *pkey; | |
546 | unsigned char comp_id, curve_id[2]; | |
547 | if (!cpk->x509 || !cpk->privatekey) | |
548 | return 0; | |
549 | pkey = X509_get_pubkey(cpk->x509); | |
550 | if (!pkey) | |
551 | return 0; | |
552 | rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec); | |
553 | EVP_PKEY_free(pkey); | |
554 | if (!rv) | |
555 | return 0; | |
556 | return tls1_check_ec_key(s, curve_id, &comp_id); | |
557 | } | |
558 | /* Check EC temporary key is compatible with client extensions */ | |
559 | int tls1_check_ec_tmp_key(SSL *s) | |
560 | { | |
561 | unsigned char curve_id[2]; | |
562 | EC_KEY *ec = s->cert->ecdh_tmp; | |
a4352630 DSH |
563 | if (s->cert->ecdh_tmp_auto) |
564 | { | |
565 | /* Need a shared curve */ | |
566 | if (tls1_shared_curve(s, 0)) | |
567 | return 1; | |
568 | else return 0; | |
569 | } | |
fd2b65ce DSH |
570 | if (!ec) |
571 | { | |
572 | if (s->cert->ecdh_tmp_cb) | |
573 | return 1; | |
574 | else | |
575 | return 0; | |
576 | } | |
577 | if (!tls1_set_ec_id(curve_id, NULL, ec)) | |
578 | return 1; | |
579 | return tls1_check_ec_key(s, curve_id, NULL); | |
580 | } | |
d0595f17 | 581 | |
525de5d3 | 582 | #endif /* OPENSSL_NO_EC */ |
f1fd4544 | 583 | |
ed3883d2 | 584 | #ifndef OPENSSL_NO_TLSEXT |
fc101f88 DSH |
585 | |
586 | /* List of supported signature algorithms and hashes. Should make this | |
587 | * customisable at some point, for now include everything we support. | |
588 | */ | |
589 | ||
590 | #ifdef OPENSSL_NO_RSA | |
591 | #define tlsext_sigalg_rsa(md) /* */ | |
592 | #else | |
593 | #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa, | |
594 | #endif | |
595 | ||
596 | #ifdef OPENSSL_NO_DSA | |
597 | #define tlsext_sigalg_dsa(md) /* */ | |
598 | #else | |
599 | #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa, | |
600 | #endif | |
601 | ||
602 | #ifdef OPENSSL_NO_ECDSA | |
603 | #define tlsext_sigalg_ecdsa(md) /* */ | |
604 | #else | |
654ac273 | 605 | #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa, |
fc101f88 DSH |
606 | #endif |
607 | ||
608 | #define tlsext_sigalg(md) \ | |
609 | tlsext_sigalg_rsa(md) \ | |
610 | tlsext_sigalg_dsa(md) \ | |
611 | tlsext_sigalg_ecdsa(md) | |
612 | ||
613 | static unsigned char tls12_sigalgs[] = { | |
614 | #ifndef OPENSSL_NO_SHA512 | |
615 | tlsext_sigalg(TLSEXT_hash_sha512) | |
616 | tlsext_sigalg(TLSEXT_hash_sha384) | |
617 | #endif | |
618 | #ifndef OPENSSL_NO_SHA256 | |
619 | tlsext_sigalg(TLSEXT_hash_sha256) | |
620 | tlsext_sigalg(TLSEXT_hash_sha224) | |
621 | #endif | |
622 | #ifndef OPENSSL_NO_SHA | |
623 | tlsext_sigalg(TLSEXT_hash_sha1) | |
624 | #endif | |
625 | #ifndef OPENSSL_NO_MD5 | |
626 | tlsext_sigalg_rsa(TLSEXT_hash_md5) | |
627 | #endif | |
628 | }; | |
629 | ||
f37f20ff DSH |
630 | int tls12_get_req_sig_algs(SSL *s, unsigned char *p) |
631 | { | |
ebc5e72f DSH |
632 | size_t slen = sizeof(tls12_sigalgs); |
633 | #ifdef OPENSSL_FIPS | |
634 | /* If FIPS mode don't include MD5 which is last */ | |
635 | if (FIPS_mode()) | |
636 | slen -= 2; | |
637 | #endif | |
f37f20ff | 638 | if (p) |
ebc5e72f DSH |
639 | memcpy(p, tls12_sigalgs, slen); |
640 | return (int)slen; | |
f37f20ff | 641 | } |
fc101f88 | 642 | |
f1fd4544 BM |
643 | unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
644 | { | |
ed3883d2 BM |
645 | int extdatalen=0; |
646 | unsigned char *ret = p; | |
d0595f17 DSH |
647 | #ifndef OPENSSL_NO_EC |
648 | /* See if we support any ECC ciphersuites */ | |
649 | int using_ecc = 0; | |
650 | if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION) | |
651 | { | |
652 | int i; | |
653 | unsigned long alg_k, alg_a; | |
654 | STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); | |
655 | ||
656 | for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) | |
657 | { | |
658 | SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); | |
659 | ||
660 | alg_k = c->algorithm_mkey; | |
661 | alg_a = c->algorithm_auth; | |
662 | if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) | |
663 | || (alg_a & SSL_aECDSA))) | |
664 | { | |
665 | using_ecc = 1; | |
666 | break; | |
667 | } | |
668 | } | |
669 | } | |
670 | #endif | |
ed3883d2 | 671 | |
13f6d57b DSH |
672 | /* don't add extensions for SSLv3 unless doing secure renegotiation */ |
673 | if (s->client_version == SSL3_VERSION | |
674 | && !s->s3->send_connection_binding) | |
5f8f94a6 DSH |
675 | return p; |
676 | ||
ed3883d2 BM |
677 | ret+=2; |
678 | ||
679 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
6434abbf | 680 | |
a70183bc | 681 | if (s->tlsext_hostname != NULL) |
f1fd4544 | 682 | { |
ed3883d2 BM |
683 | /* Add TLS extension servername to the Client Hello message */ |
684 | unsigned long size_str; | |
685 | long lenmax; | |
686 | ||
a70183bc | 687 | /* check for enough space. |
52b8dad8 BM |
688 | 4 for the servername type and entension length |
689 | 2 for servernamelist length | |
690 | 1 for the hostname type | |
691 | 2 for hostname length | |
692 | + hostname length | |
a70183bc | 693 | */ |
52b8dad8 | 694 | |
761772d7 BM |
695 | if ((lenmax = limit - ret - 9) < 0 |
696 | || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) | |
a70183bc BM |
697 | return NULL; |
698 | ||
699 | /* extension type and length */ | |
700 | s2n(TLSEXT_TYPE_server_name,ret); | |
701 | s2n(size_str+5,ret); | |
f1fd4544 | 702 | |
a70183bc | 703 | /* length of servername list */ |
ed3883d2 | 704 | s2n(size_str+3,ret); |
a70183bc BM |
705 | |
706 | /* hostname type, length and hostname */ | |
f1fd4544 | 707 | *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; |
ed3883d2 | 708 | s2n(size_str,ret); |
ed3883d2 BM |
709 | memcpy(ret, s->tlsext_hostname, size_str); |
710 | ret+=size_str; | |
f1fd4544 | 711 | } |
761772d7 | 712 | |
423c66f1 | 713 | /* Add RI if renegotiating */ |
bdd53508 | 714 | if (s->renegotiate) |
423c66f1 | 715 | { |
860c3dd1 DSH |
716 | int el; |
717 | ||
718 | if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) | |
719 | { | |
720 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
721 | return NULL; | |
722 | } | |
723 | ||
724 | if((limit - p - 4 - el) < 0) return NULL; | |
725 | ||
726 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
727 | s2n(el,ret); | |
728 | ||
729 | if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) | |
730 | { | |
731 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
732 | return NULL; | |
733 | } | |
734 | ||
735 | ret += el; | |
736 | } | |
737 | ||
edc032b5 | 738 | #ifndef OPENSSL_NO_SRP |
1df80b65 | 739 | /* Add SRP username if there is one */ |
edc032b5 | 740 | if (s->srp_ctx.login != NULL) |
1df80b65 | 741 | { /* Add TLS extension SRP username to the Client Hello message */ |
edc032b5 | 742 | |
1df80b65 DSH |
743 | int login_len = strlen(s->srp_ctx.login); |
744 | if (login_len > 255 || login_len == 0) | |
edc032b5 BL |
745 | { |
746 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
747 | return NULL; | |
1df80b65 DSH |
748 | } |
749 | ||
750 | /* check for enough space. | |
751 | 4 for the srp type type and entension length | |
752 | 1 for the srp user identity | |
753 | + srp user identity length | |
754 | */ | |
755 | if ((limit - ret - 5 - login_len) < 0) return NULL; | |
756 | ||
757 | /* fill in the extension */ | |
edc032b5 BL |
758 | s2n(TLSEXT_TYPE_srp,ret); |
759 | s2n(login_len+1,ret); | |
1df80b65 DSH |
760 | (*ret++) = (unsigned char) login_len; |
761 | memcpy(ret, s->srp_ctx.login, login_len); | |
edc032b5 BL |
762 | ret+=login_len; |
763 | } | |
764 | #endif | |
765 | ||
36ca4ba6 | 766 | #ifndef OPENSSL_NO_EC |
d0595f17 | 767 | if (using_ecc) |
36ca4ba6 BM |
768 | { |
769 | /* Add TLS extension ECPointFormats to the ClientHello message */ | |
770 | long lenmax; | |
d0595f17 DSH |
771 | const unsigned char *plist; |
772 | size_t plistlen; | |
773 | /* If we have a custom point format list use it otherwise | |
774 | * use default */ | |
775 | plist = s->tlsext_ecpointformatlist; | |
776 | if (plist) | |
777 | plistlen = s->tlsext_ecpointformatlist_length; | |
778 | else | |
779 | { | |
780 | plist = ecformats_default; | |
781 | plistlen = sizeof(ecformats_default); | |
782 | } | |
36ca4ba6 | 783 | |
761772d7 | 784 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
d0595f17 DSH |
785 | if (plistlen > (size_t)lenmax) return NULL; |
786 | if (plistlen > 255) | |
019fdc78 BM |
787 | { |
788 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
789 | return NULL; | |
790 | } | |
36ca4ba6 BM |
791 | |
792 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
d0595f17 DSH |
793 | s2n(plistlen + 1,ret); |
794 | *(ret++) = (unsigned char)plistlen ; | |
795 | memcpy(ret, plist, plistlen); | |
796 | ret+=plistlen; | |
797 | ||
33273721 | 798 | /* Add TLS extension EllipticCurves to the ClientHello message */ |
d0595f17 | 799 | plist = s->tlsext_ellipticcurvelist; |
fd2b65ce | 800 | tls1_get_curvelist(s, 0, &plist, &plistlen); |
33273721 | 801 | |
761772d7 | 802 | if ((lenmax = limit - ret - 6) < 0) return NULL; |
d0595f17 DSH |
803 | if (plistlen > (size_t)lenmax) return NULL; |
804 | if (plistlen > 65532) | |
33273721 BM |
805 | { |
806 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
807 | return NULL; | |
808 | } | |
809 | ||
810 | s2n(TLSEXT_TYPE_elliptic_curves,ret); | |
d0595f17 | 811 | s2n(plistlen + 2, ret); |
a4974de9 BM |
812 | |
813 | /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for | |
814 | * elliptic_curve_list, but the examples use two bytes. | |
815 | * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html | |
816 | * resolves this to two bytes. | |
817 | */ | |
d0595f17 DSH |
818 | s2n(plistlen, ret); |
819 | memcpy(ret, plist, plistlen); | |
820 | ret+=plistlen; | |
33273721 | 821 | } |
36ca4ba6 | 822 | #endif /* OPENSSL_NO_EC */ |
d3442bc7 | 823 | |
6434abbf DSH |
824 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) |
825 | { | |
826 | int ticklen; | |
7ba3838a | 827 | if (!s->new_session && s->session && s->session->tlsext_tick) |
6434abbf | 828 | ticklen = s->session->tlsext_ticklen; |
12bf56c0 DSH |
829 | else if (s->session && s->tlsext_session_ticket && |
830 | s->tlsext_session_ticket->data) | |
831 | { | |
832 | ticklen = s->tlsext_session_ticket->length; | |
833 | s->session->tlsext_tick = OPENSSL_malloc(ticklen); | |
834 | if (!s->session->tlsext_tick) | |
835 | return NULL; | |
836 | memcpy(s->session->tlsext_tick, | |
837 | s->tlsext_session_ticket->data, | |
838 | ticklen); | |
839 | s->session->tlsext_ticklen = ticklen; | |
840 | } | |
6434abbf DSH |
841 | else |
842 | ticklen = 0; | |
12bf56c0 DSH |
843 | if (ticklen == 0 && s->tlsext_session_ticket && |
844 | s->tlsext_session_ticket->data == NULL) | |
845 | goto skip_ext; | |
6434abbf DSH |
846 | /* Check for enough room 2 for extension type, 2 for len |
847 | * rest for ticket | |
848 | */ | |
761772d7 | 849 | if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; |
6434abbf DSH |
850 | s2n(TLSEXT_TYPE_session_ticket,ret); |
851 | s2n(ticklen,ret); | |
852 | if (ticklen) | |
853 | { | |
854 | memcpy(ret, s->session->tlsext_tick, ticklen); | |
855 | ret += ticklen; | |
856 | } | |
857 | } | |
12bf56c0 | 858 | skip_ext: |
6434abbf | 859 | |
7744ef1a | 860 | if (TLS1_get_client_version(s) >= TLS1_2_VERSION) |
a2f9200f | 861 | { |
fc101f88 | 862 | if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6) |
a2f9200f DSH |
863 | return NULL; |
864 | s2n(TLSEXT_TYPE_signature_algorithms,ret); | |
fc101f88 DSH |
865 | s2n(sizeof(tls12_sigalgs) + 2, ret); |
866 | s2n(sizeof(tls12_sigalgs), ret); | |
867 | memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs)); | |
868 | ret += sizeof(tls12_sigalgs); | |
a2f9200f DSH |
869 | } |
870 | ||
761772d7 | 871 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
872 | if (s->s3->client_opaque_prf_input != NULL && |
873 | s->version != DTLS1_VERSION) | |
761772d7 BM |
874 | { |
875 | size_t col = s->s3->client_opaque_prf_input_len; | |
876 | ||
877 | if ((long)(limit - ret - 6 - col < 0)) | |
878 | return NULL; | |
879 | if (col > 0xFFFD) /* can't happen */ | |
880 | return NULL; | |
881 | ||
882 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
883 | s2n(col + 2, ret); | |
884 | s2n(col, ret); | |
885 | memcpy(ret, s->s3->client_opaque_prf_input, col); | |
886 | ret += col; | |
887 | } | |
888 | #endif | |
889 | ||
8025e251 DSH |
890 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && |
891 | s->version != DTLS1_VERSION) | |
67c8e7f4 DSH |
892 | { |
893 | int i; | |
894 | long extlen, idlen, itmp; | |
895 | OCSP_RESPID *id; | |
896 | ||
897 | idlen = 0; | |
898 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
899 | { | |
900 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
901 | itmp = i2d_OCSP_RESPID(id, NULL); | |
902 | if (itmp <= 0) | |
903 | return NULL; | |
904 | idlen += itmp + 2; | |
905 | } | |
906 | ||
907 | if (s->tlsext_ocsp_exts) | |
908 | { | |
909 | extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
910 | if (extlen < 0) | |
911 | return NULL; | |
912 | } | |
913 | else | |
914 | extlen = 0; | |
915 | ||
916 | if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; | |
917 | s2n(TLSEXT_TYPE_status_request, ret); | |
918 | if (extlen + idlen > 0xFFF0) | |
919 | return NULL; | |
920 | s2n(extlen + idlen + 5, ret); | |
921 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
922 | s2n(idlen, ret); | |
923 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
924 | { | |
925 | /* save position of id len */ | |
926 | unsigned char *q = ret; | |
927 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
928 | /* skip over id len */ | |
929 | ret += 2; | |
930 | itmp = i2d_OCSP_RESPID(id, &ret); | |
931 | /* write id len */ | |
932 | s2n(itmp, q); | |
933 | } | |
934 | s2n(extlen, ret); | |
935 | if (extlen > 0) | |
936 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
937 | } | |
938 | ||
4817504d DSH |
939 | #ifndef OPENSSL_NO_HEARTBEATS |
940 | /* Add Heartbeat extension */ | |
941 | s2n(TLSEXT_TYPE_heartbeat,ret); | |
942 | s2n(1,ret); | |
943 | /* Set mode: | |
944 | * 1: peer may send requests | |
945 | * 2: peer not allowed to send requests | |
946 | */ | |
947 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) | |
948 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
949 | else | |
950 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
951 | #endif | |
952 | ||
bf48836c | 953 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
954 | if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) |
955 | { | |
956 | /* The client advertises an emtpy extension to indicate its | |
957 | * support for Next Protocol Negotiation */ | |
958 | if (limit - ret - 4 < 0) | |
959 | return NULL; | |
960 | s2n(TLSEXT_TYPE_next_proto_neg,ret); | |
961 | s2n(0,ret); | |
962 | } | |
963 | #endif | |
964 | ||
333f926d BL |
965 | if(SSL_get_srtp_profiles(s)) |
966 | { | |
967 | int el; | |
968 | ||
969 | ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0); | |
970 | ||
971 | if((limit - p - 4 - el) < 0) return NULL; | |
972 | ||
973 | s2n(TLSEXT_TYPE_use_srtp,ret); | |
974 | s2n(el,ret); | |
975 | ||
976 | if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) | |
977 | { | |
978 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
979 | return NULL; | |
980 | } | |
981 | ret += el; | |
982 | } | |
983 | ||
ed3883d2 BM |
984 | if ((extdatalen = ret-p-2)== 0) |
985 | return p; | |
986 | ||
987 | s2n(extdatalen,p); | |
988 | return ret; | |
52b8dad8 | 989 | } |
ed3883d2 | 990 | |
f1fd4544 BM |
991 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
992 | { | |
ed3883d2 BM |
993 | int extdatalen=0; |
994 | unsigned char *ret = p; | |
bf48836c BL |
995 | #ifndef OPENSSL_NO_NEXTPROTONEG |
996 | int next_proto_neg_seen; | |
ee2ffc27 | 997 | #endif |
ed3883d2 | 998 | |
13f6d57b DSH |
999 | /* don't add extensions for SSLv3, unless doing secure renegotiation */ |
1000 | if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) | |
5f8f94a6 DSH |
1001 | return p; |
1002 | ||
a13c20f6 | 1003 | ret+=2; |
ed3883d2 BM |
1004 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ |
1005 | ||
a13c20f6 | 1006 | if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) |
f1fd4544 | 1007 | { |
761772d7 | 1008 | if ((long)(limit - ret - 4) < 0) return NULL; |
ed3883d2 BM |
1009 | |
1010 | s2n(TLSEXT_TYPE_server_name,ret); | |
1011 | s2n(0,ret); | |
f1fd4544 | 1012 | } |
860c3dd1 | 1013 | |
8025e251 | 1014 | if(s->s3->send_connection_binding) |
860c3dd1 DSH |
1015 | { |
1016 | int el; | |
1017 | ||
1018 | if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) | |
1019 | { | |
1020 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
1024 | if((limit - p - 4 - el) < 0) return NULL; | |
1025 | ||
1026 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
1027 | s2n(el,ret); | |
1028 | ||
1029 | if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) | |
1030 | { | |
1031 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1032 | return NULL; | |
1033 | } | |
1034 | ||
1035 | ret += el; | |
1036 | } | |
1037 | ||
36ca4ba6 | 1038 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
1039 | if (s->tlsext_ecpointformatlist != NULL && |
1040 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
1041 | { |
1042 | /* Add TLS extension ECPointFormats to the ServerHello message */ | |
1043 | long lenmax; | |
1044 | ||
761772d7 | 1045 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
36ca4ba6 | 1046 | if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; |
019fdc78 BM |
1047 | if (s->tlsext_ecpointformatlist_length > 255) |
1048 | { | |
1049 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1050 | return NULL; | |
1051 | } | |
36ca4ba6 BM |
1052 | |
1053 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
1054 | s2n(s->tlsext_ecpointformatlist_length + 1,ret); | |
1055 | *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; | |
1056 | memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); | |
1057 | ret+=s->tlsext_ecpointformatlist_length; | |
a70183bc | 1058 | |
36ca4ba6 | 1059 | } |
33273721 | 1060 | /* Currently the server should not respond with a SupportedCurves extension */ |
36ca4ba6 | 1061 | #endif /* OPENSSL_NO_EC */ |
67c8e7f4 | 1062 | |
6434abbf DSH |
1063 | if (s->tlsext_ticket_expected |
1064 | && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
1065 | { | |
761772d7 | 1066 | if ((long)(limit - ret - 4) < 0) return NULL; |
6434abbf DSH |
1067 | s2n(TLSEXT_TYPE_session_ticket,ret); |
1068 | s2n(0,ret); | |
1069 | } | |
761772d7 | 1070 | |
67c8e7f4 DSH |
1071 | if (s->tlsext_status_expected) |
1072 | { | |
1073 | if ((long)(limit - ret - 4) < 0) return NULL; | |
1074 | s2n(TLSEXT_TYPE_status_request,ret); | |
1075 | s2n(0,ret); | |
1076 | } | |
1077 | ||
761772d7 | 1078 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
1079 | if (s->s3->server_opaque_prf_input != NULL && |
1080 | s->version != DTLS1_VERSION) | |
761772d7 BM |
1081 | { |
1082 | size_t sol = s->s3->server_opaque_prf_input_len; | |
6434abbf | 1083 | |
761772d7 BM |
1084 | if ((long)(limit - ret - 6 - sol) < 0) |
1085 | return NULL; | |
1086 | if (sol > 0xFFFD) /* can't happen */ | |
1087 | return NULL; | |
1088 | ||
1089 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
1090 | s2n(sol + 2, ret); | |
1091 | s2n(sol, ret); | |
1092 | memcpy(ret, s->s3->server_opaque_prf_input, sol); | |
1093 | ret += sol; | |
1094 | } | |
1095 | #endif | |
333f926d BL |
1096 | |
1097 | if(s->srtp_profile) | |
1098 | { | |
1099 | int el; | |
1100 | ||
1101 | ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0); | |
1102 | ||
1103 | if((limit - p - 4 - el) < 0) return NULL; | |
1104 | ||
1105 | s2n(TLSEXT_TYPE_use_srtp,ret); | |
1106 | s2n(el,ret); | |
1107 | ||
1108 | if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) | |
1109 | { | |
7a236261 | 1110 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
333f926d BL |
1111 | return NULL; |
1112 | } | |
1113 | ret+=el; | |
1114 | } | |
1115 | ||
0e1dba93 DSH |
1116 | if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) |
1117 | && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) | |
1118 | { const unsigned char cryptopro_ext[36] = { | |
1119 | 0xfd, 0xe8, /*65000*/ | |
1120 | 0x00, 0x20, /*32 bytes length*/ | |
1121 | 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, | |
1122 | 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, | |
1123 | 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, | |
1124 | 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; | |
1125 | if (limit-ret<36) return NULL; | |
1126 | memcpy(ret,cryptopro_ext,36); | |
1127 | ret+=36; | |
1128 | ||
1129 | } | |
761772d7 | 1130 | |
4817504d | 1131 | #ifndef OPENSSL_NO_HEARTBEATS |
5733919d DSH |
1132 | /* Add Heartbeat extension if we've received one */ |
1133 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) | |
1134 | { | |
1135 | s2n(TLSEXT_TYPE_heartbeat,ret); | |
1136 | s2n(1,ret); | |
1137 | /* Set mode: | |
1138 | * 1: peer may send requests | |
1139 | * 2: peer not allowed to send requests | |
1140 | */ | |
1141 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) | |
1142 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1143 | else | |
1144 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
192540b5 | 1145 | |
5733919d | 1146 | } |
4817504d DSH |
1147 | #endif |
1148 | ||
bf48836c | 1149 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1150 | next_proto_neg_seen = s->s3->next_proto_neg_seen; |
1151 | s->s3->next_proto_neg_seen = 0; | |
1152 | if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) | |
1153 | { | |
1154 | const unsigned char *npa; | |
1155 | unsigned int npalen; | |
1156 | int r; | |
1157 | ||
1158 | r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg); | |
1159 | if (r == SSL_TLSEXT_ERR_OK) | |
1160 | { | |
1161 | if ((long)(limit - ret - 4 - npalen) < 0) return NULL; | |
1162 | s2n(TLSEXT_TYPE_next_proto_neg,ret); | |
1163 | s2n(npalen,ret); | |
1164 | memcpy(ret, npa, npalen); | |
1165 | ret += npalen; | |
1166 | s->s3->next_proto_neg_seen = 1; | |
1167 | } | |
1168 | } | |
1169 | #endif | |
1170 | ||
ed3883d2 BM |
1171 | if ((extdatalen = ret-p-2)== 0) |
1172 | return p; | |
1173 | ||
1174 | s2n(extdatalen,p); | |
1175 | return ret; | |
52b8dad8 | 1176 | } |
ed3883d2 | 1177 | |
b2284ed3 DSH |
1178 | static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
1179 | { | |
ed3883d2 BM |
1180 | unsigned short type; |
1181 | unsigned short size; | |
1182 | unsigned short len; | |
f1fd4544 | 1183 | unsigned char *data = *p; |
860c3dd1 | 1184 | int renegotiate_seen = 0; |
6b7be581 | 1185 | int sigalg_seen = 0; |
860c3dd1 | 1186 | |
a13c20f6 | 1187 | s->servername_done = 0; |
67c8e7f4 | 1188 | s->tlsext_status_type = -1; |
6f31dd72 BM |
1189 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1190 | s->s3->next_proto_neg_seen = 0; | |
1191 | #endif | |
ed3883d2 | 1192 | |
4817504d DSH |
1193 | #ifndef OPENSSL_NO_HEARTBEATS |
1194 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
1195 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
1196 | #endif | |
1197 | ||
ed3883d2 | 1198 | if (data >= (d+n-2)) |
c27c9cb4 | 1199 | goto ri_check; |
ed3883d2 BM |
1200 | n2s(data,len); |
1201 | ||
52b8dad8 | 1202 | if (data > (d+n-len)) |
c27c9cb4 | 1203 | goto ri_check; |
ed3883d2 | 1204 | |
f1fd4544 BM |
1205 | while (data <= (d+n-4)) |
1206 | { | |
ed3883d2 BM |
1207 | n2s(data,type); |
1208 | n2s(data,size); | |
1209 | ||
1210 | if (data+size > (d+n)) | |
c27c9cb4 | 1211 | goto ri_check; |
8e3b2dbb | 1212 | #if 0 |
0e1dba93 | 1213 | fprintf(stderr,"Received extension type %d size %d\n",type,size); |
8e3b2dbb | 1214 | #endif |
6434abbf DSH |
1215 | if (s->tlsext_debug_cb) |
1216 | s->tlsext_debug_cb(s, 0, type, data, size, | |
1217 | s->tlsext_debug_arg); | |
a13c20f6 BM |
1218 | /* The servername extension is treated as follows: |
1219 | ||
1220 | - Only the hostname type is supported with a maximum length of 255. | |
1221 | - The servername is rejected if too long or if it contains zeros, | |
1222 | in which case an fatal alert is generated. | |
1223 | - The servername field is maintained together with the session cache. | |
1224 | - When a session is resumed, the servername call back invoked in order | |
1225 | to allow the application to position itself to the right context. | |
1226 | - The servername is acknowledged if it is new for a session or when | |
1227 | it is identical to a previously used for the same session. | |
1228 | Applications can control the behaviour. They can at any time | |
1229 | set a 'desirable' servername for a new SSL object. This can be the | |
1230 | case for example with HTTPS when a Host: header field is received and | |
1231 | a renegotiation is requested. In this case, a possible servername | |
1232 | presented in the new client hello is only acknowledged if it matches | |
1233 | the value of the Host: field. | |
1234 | - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | |
1235 | if they provide for changing an explicit servername context for the session, | |
1236 | i.e. when the session has been established with a servername extension. | |
1237 | - On session reconnect, the servername extension may be absent. | |
1238 | ||
1239 | */ | |
1240 | ||
f1fd4544 BM |
1241 | if (type == TLSEXT_TYPE_server_name) |
1242 | { | |
a70183bc | 1243 | unsigned char *sdata; |
ed3883d2 | 1244 | int servname_type; |
a70183bc BM |
1245 | int dsize; |
1246 | ||
1247 | if (size < 2) | |
1248 | { | |
1249 | *al = SSL_AD_DECODE_ERROR; | |
1250 | return 0; | |
1251 | } | |
1252 | n2s(data,dsize); | |
52b8dad8 | 1253 | size -= 2; |
a70183bc | 1254 | if (dsize > size ) |
f1fd4544 | 1255 | { |
a70183bc BM |
1256 | *al = SSL_AD_DECODE_ERROR; |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | sdata = data; | |
1261 | while (dsize > 3) | |
1262 | { | |
1263 | servname_type = *(sdata++); | |
ed3883d2 | 1264 | n2s(sdata,len); |
a70183bc BM |
1265 | dsize -= 3; |
1266 | ||
1267 | if (len > dsize) | |
f1fd4544 BM |
1268 | { |
1269 | *al = SSL_AD_DECODE_ERROR; | |
1270 | return 0; | |
1271 | } | |
a70183bc | 1272 | if (s->servername_done == 0) |
f1fd4544 BM |
1273 | switch (servname_type) |
1274 | { | |
1275 | case TLSEXT_NAMETYPE_host_name: | |
732d31be | 1276 | if (!s->hit) |
f1fd4544 | 1277 | { |
732d31be DSH |
1278 | if(s->session->tlsext_hostname) |
1279 | { | |
1280 | *al = SSL_AD_DECODE_ERROR; | |
1281 | return 0; | |
1282 | } | |
1283 | if (len > TLSEXT_MAXLEN_host_name) | |
f1fd4544 BM |
1284 | { |
1285 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
1286 | return 0; | |
1287 | } | |
732d31be DSH |
1288 | if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) |
1289 | { | |
1290 | *al = TLS1_AD_INTERNAL_ERROR; | |
1291 | return 0; | |
1292 | } | |
ed3883d2 | 1293 | memcpy(s->session->tlsext_hostname, sdata, len); |
a13c20f6 BM |
1294 | s->session->tlsext_hostname[len]='\0'; |
1295 | if (strlen(s->session->tlsext_hostname) != len) { | |
1296 | OPENSSL_free(s->session->tlsext_hostname); | |
40a70628 | 1297 | s->session->tlsext_hostname = NULL; |
a13c20f6 BM |
1298 | *al = TLS1_AD_UNRECOGNIZED_NAME; |
1299 | return 0; | |
f1fd4544 | 1300 | } |
a13c20f6 BM |
1301 | s->servername_done = 1; |
1302 | ||
a13c20f6 BM |
1303 | } |
1304 | else | |
732d31be DSH |
1305 | s->servername_done = s->session->tlsext_hostname |
1306 | && strlen(s->session->tlsext_hostname) == len | |
6b9e941e | 1307 | && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; |
a13c20f6 | 1308 | |
ed3883d2 | 1309 | break; |
f1fd4544 | 1310 | |
ed3883d2 BM |
1311 | default: |
1312 | break; | |
f1fd4544 | 1313 | } |
52b8dad8 | 1314 | |
a70183bc | 1315 | dsize -= len; |
f1fd4544 | 1316 | } |
a70183bc BM |
1317 | if (dsize != 0) |
1318 | { | |
1319 | *al = SSL_AD_DECODE_ERROR; | |
1320 | return 0; | |
1321 | } | |
1322 | ||
ed3883d2 | 1323 | } |
edc032b5 BL |
1324 | #ifndef OPENSSL_NO_SRP |
1325 | else if (type == TLSEXT_TYPE_srp) | |
1326 | { | |
1df80b65 DSH |
1327 | if (size <= 0 || ((len = data[0])) != (size -1)) |
1328 | { | |
1329 | *al = SSL_AD_DECODE_ERROR; | |
1330 | return 0; | |
1331 | } | |
1332 | if (s->srp_ctx.login != NULL) | |
edc032b5 | 1333 | { |
1df80b65 DSH |
1334 | *al = SSL_AD_DECODE_ERROR; |
1335 | return 0; | |
1336 | } | |
1337 | if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL) | |
1338 | return -1; | |
1339 | memcpy(s->srp_ctx.login, &data[1], len); | |
1340 | s->srp_ctx.login[len]='\0'; | |
1341 | ||
1342 | if (strlen(s->srp_ctx.login) != len) | |
1343 | { | |
1344 | *al = SSL_AD_DECODE_ERROR; | |
1345 | return 0; | |
edc032b5 BL |
1346 | } |
1347 | } | |
1348 | #endif | |
ed3883d2 | 1349 | |
36ca4ba6 | 1350 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
1351 | else if (type == TLSEXT_TYPE_ec_point_formats && |
1352 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
1353 | { |
1354 | unsigned char *sdata = data; | |
1355 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
1356 | |
1357 | if (ecpointformatlist_length != size - 1) | |
1358 | { | |
1359 | *al = TLS1_AD_DECODE_ERROR; | |
1360 | return 0; | |
1361 | } | |
732d31be | 1362 | if (!s->hit) |
36ca4ba6 | 1363 | { |
732d31be DSH |
1364 | if(s->session->tlsext_ecpointformatlist) |
1365 | { | |
7d5686d3 DSH |
1366 | OPENSSL_free(s->session->tlsext_ecpointformatlist); |
1367 | s->session->tlsext_ecpointformatlist = NULL; | |
732d31be DSH |
1368 | } |
1369 | s->session->tlsext_ecpointformatlist_length = 0; | |
1370 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) | |
1371 | { | |
1372 | *al = TLS1_AD_INTERNAL_ERROR; | |
1373 | return 0; | |
1374 | } | |
1375 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
1376 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
36ca4ba6 | 1377 | } |
36ca4ba6 BM |
1378 | #if 0 |
1379 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); | |
1380 | sdata = s->session->tlsext_ecpointformatlist; | |
1381 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
1382 | fprintf(stderr,"%i ",*(sdata++)); | |
1383 | fprintf(stderr,"\n"); | |
33273721 BM |
1384 | #endif |
1385 | } | |
8025e251 DSH |
1386 | else if (type == TLSEXT_TYPE_elliptic_curves && |
1387 | s->version != DTLS1_VERSION) | |
33273721 BM |
1388 | { |
1389 | unsigned char *sdata = data; | |
1390 | int ellipticcurvelist_length = (*(sdata++) << 8); | |
1391 | ellipticcurvelist_length += (*(sdata++)); | |
1392 | ||
1393 | if (ellipticcurvelist_length != size - 2) | |
1394 | { | |
1395 | *al = TLS1_AD_DECODE_ERROR; | |
1396 | return 0; | |
1397 | } | |
732d31be | 1398 | if (!s->hit) |
33273721 | 1399 | { |
732d31be DSH |
1400 | if(s->session->tlsext_ellipticcurvelist) |
1401 | { | |
1402 | *al = TLS1_AD_DECODE_ERROR; | |
1403 | return 0; | |
1404 | } | |
1405 | s->session->tlsext_ellipticcurvelist_length = 0; | |
1406 | if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) | |
1407 | { | |
1408 | *al = TLS1_AD_INTERNAL_ERROR; | |
1409 | return 0; | |
1410 | } | |
1411 | s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; | |
1412 | memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); | |
33273721 | 1413 | } |
33273721 BM |
1414 | #if 0 |
1415 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); | |
1416 | sdata = s->session->tlsext_ellipticcurvelist; | |
1417 | for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) | |
1418 | fprintf(stderr,"%i ",*(sdata++)); | |
1419 | fprintf(stderr,"\n"); | |
36ca4ba6 BM |
1420 | #endif |
1421 | } | |
c6a27f01 | 1422 | #endif /* OPENSSL_NO_EC */ |
761772d7 | 1423 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
1424 | else if (type == TLSEXT_TYPE_opaque_prf_input && |
1425 | s->version != DTLS1_VERSION) | |
761772d7 BM |
1426 | { |
1427 | unsigned char *sdata = data; | |
1428 | ||
1429 | if (size < 2) | |
1430 | { | |
1431 | *al = SSL_AD_DECODE_ERROR; | |
1432 | return 0; | |
1433 | } | |
1434 | n2s(sdata, s->s3->client_opaque_prf_input_len); | |
1435 | if (s->s3->client_opaque_prf_input_len != size - 2) | |
1436 | { | |
1437 | *al = SSL_AD_DECODE_ERROR; | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1442 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
02c27b11 BM |
1443 | if (s->s3->client_opaque_prf_input_len == 0) |
1444 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1445 | else | |
1446 | s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); | |
761772d7 BM |
1447 | if (s->s3->client_opaque_prf_input == NULL) |
1448 | { | |
1449 | *al = TLS1_AD_INTERNAL_ERROR; | |
1450 | return 0; | |
1451 | } | |
1452 | } | |
1453 | #endif | |
12bf56c0 DSH |
1454 | else if (type == TLSEXT_TYPE_session_ticket) |
1455 | { | |
1456 | if (s->tls_session_ticket_ext_cb && | |
1457 | !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) | |
1458 | { | |
1459 | *al = TLS1_AD_INTERNAL_ERROR; | |
1460 | return 0; | |
1461 | } | |
1462 | } | |
860c3dd1 DSH |
1463 | else if (type == TLSEXT_TYPE_renegotiate) |
1464 | { | |
1465 | if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) | |
1466 | return 0; | |
1467 | renegotiate_seen = 1; | |
1468 | } | |
6b7be581 DSH |
1469 | else if (type == TLSEXT_TYPE_signature_algorithms) |
1470 | { | |
1471 | int dsize; | |
1472 | if (sigalg_seen || size < 2) | |
1473 | { | |
1474 | *al = SSL_AD_DECODE_ERROR; | |
1475 | return 0; | |
1476 | } | |
1477 | sigalg_seen = 1; | |
1478 | n2s(data,dsize); | |
1479 | size -= 2; | |
1480 | if (dsize != size || dsize & 1) | |
1481 | { | |
1482 | *al = SSL_AD_DECODE_ERROR; | |
1483 | return 0; | |
1484 | } | |
1485 | if (!tls1_process_sigalgs(s, data, dsize)) | |
1486 | { | |
1487 | *al = SSL_AD_DECODE_ERROR; | |
1488 | return 0; | |
1489 | } | |
1490 | } | |
8025e251 DSH |
1491 | else if (type == TLSEXT_TYPE_status_request && |
1492 | s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) | |
67c8e7f4 DSH |
1493 | { |
1494 | ||
1495 | if (size < 5) | |
1496 | { | |
1497 | *al = SSL_AD_DECODE_ERROR; | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | s->tlsext_status_type = *data++; | |
1502 | size--; | |
1503 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) | |
1504 | { | |
1505 | const unsigned char *sdata; | |
1506 | int dsize; | |
1507 | /* Read in responder_id_list */ | |
1508 | n2s(data,dsize); | |
1509 | size -= 2; | |
1510 | if (dsize > size ) | |
1511 | { | |
1512 | *al = SSL_AD_DECODE_ERROR; | |
1513 | return 0; | |
1514 | } | |
1515 | while (dsize > 0) | |
1516 | { | |
1517 | OCSP_RESPID *id; | |
1518 | int idsize; | |
1519 | if (dsize < 4) | |
1520 | { | |
1521 | *al = SSL_AD_DECODE_ERROR; | |
1522 | return 0; | |
1523 | } | |
1524 | n2s(data, idsize); | |
1525 | dsize -= 2 + idsize; | |
9770924f | 1526 | size -= 2 + idsize; |
67c8e7f4 DSH |
1527 | if (dsize < 0) |
1528 | { | |
1529 | *al = SSL_AD_DECODE_ERROR; | |
1530 | return 0; | |
1531 | } | |
1532 | sdata = data; | |
1533 | data += idsize; | |
1534 | id = d2i_OCSP_RESPID(NULL, | |
1535 | &sdata, idsize); | |
1536 | if (!id) | |
1537 | { | |
1538 | *al = SSL_AD_DECODE_ERROR; | |
1539 | return 0; | |
1540 | } | |
1541 | if (data != sdata) | |
1542 | { | |
1543 | OCSP_RESPID_free(id); | |
1544 | *al = SSL_AD_DECODE_ERROR; | |
1545 | return 0; | |
1546 | } | |
1547 | if (!s->tlsext_ocsp_ids | |
1548 | && !(s->tlsext_ocsp_ids = | |
1549 | sk_OCSP_RESPID_new_null())) | |
1550 | { | |
1551 | OCSP_RESPID_free(id); | |
1552 | *al = SSL_AD_INTERNAL_ERROR; | |
1553 | return 0; | |
1554 | } | |
1555 | if (!sk_OCSP_RESPID_push( | |
1556 | s->tlsext_ocsp_ids, id)) | |
1557 | { | |
1558 | OCSP_RESPID_free(id); | |
1559 | *al = SSL_AD_INTERNAL_ERROR; | |
1560 | return 0; | |
1561 | } | |
1562 | } | |
1563 | ||
1564 | /* Read in request_extensions */ | |
9770924f BM |
1565 | if (size < 2) |
1566 | { | |
1567 | *al = SSL_AD_DECODE_ERROR; | |
1568 | return 0; | |
1569 | } | |
67c8e7f4 DSH |
1570 | n2s(data,dsize); |
1571 | size -= 2; | |
9770924f | 1572 | if (dsize != size) |
67c8e7f4 DSH |
1573 | { |
1574 | *al = SSL_AD_DECODE_ERROR; | |
1575 | return 0; | |
1576 | } | |
1577 | sdata = data; | |
1578 | if (dsize > 0) | |
1579 | { | |
25536ea6 DSH |
1580 | if (s->tlsext_ocsp_exts) |
1581 | { | |
1582 | sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, | |
1583 | X509_EXTENSION_free); | |
1584 | } | |
1585 | ||
67c8e7f4 DSH |
1586 | s->tlsext_ocsp_exts = |
1587 | d2i_X509_EXTENSIONS(NULL, | |
1588 | &sdata, dsize); | |
1589 | if (!s->tlsext_ocsp_exts | |
1590 | || (data + dsize != sdata)) | |
1591 | { | |
1592 | *al = SSL_AD_DECODE_ERROR; | |
1593 | return 0; | |
1594 | } | |
1595 | } | |
1596 | } | |
1597 | /* We don't know what to do with any other type | |
1598 | * so ignore it. | |
1599 | */ | |
1600 | else | |
1601 | s->tlsext_status_type = -1; | |
1602 | } | |
4817504d DSH |
1603 | #ifndef OPENSSL_NO_HEARTBEATS |
1604 | else if (type == TLSEXT_TYPE_heartbeat) | |
1605 | { | |
1606 | switch(data[0]) | |
1607 | { | |
1608 | case 0x01: /* Client allows us to send HB requests */ | |
1609 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1610 | break; | |
1611 | case 0x02: /* Client doesn't accept HB requests */ | |
1612 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1613 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1614 | break; | |
192540b5 DSH |
1615 | default: *al = SSL_AD_ILLEGAL_PARAMETER; |
1616 | return 0; | |
4817504d DSH |
1617 | } |
1618 | } | |
1619 | #endif | |
bf48836c | 1620 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1621 | else if (type == TLSEXT_TYPE_next_proto_neg && |
1622 | s->s3->tmp.finish_md_len == 0) | |
1623 | { | |
1624 | /* We shouldn't accept this extension on a | |
1625 | * renegotiation. | |
1626 | * | |
1627 | * s->new_session will be set on renegotiation, but we | |
1628 | * probably shouldn't rely that it couldn't be set on | |
1629 | * the initial renegotation too in certain cases (when | |
1630 | * there's some other reason to disallow resuming an | |
1631 | * earlier session -- the current code won't be doing | |
1632 | * anything like that, but this might change). | |
1633 | ||
1634 | * A valid sign that there's been a previous handshake | |
1635 | * in this connection is if s->s3->tmp.finish_md_len > | |
1636 | * 0. (We are talking about a check that will happen | |
1637 | * in the Hello protocol round, well before a new | |
1638 | * Finished message could have been computed.) */ | |
1639 | s->s3->next_proto_neg_seen = 1; | |
1640 | } | |
1641 | #endif | |
761772d7 | 1642 | |
6434abbf | 1643 | /* session ticket processed earlier */ |
333f926d BL |
1644 | else if (type == TLSEXT_TYPE_use_srtp) |
1645 | { | |
1646 | if(ssl_parse_clienthello_use_srtp_ext(s, data, size, | |
1647 | al)) | |
1648 | return 0; | |
1649 | } | |
1650 | ||
6434abbf | 1651 | data+=size; |
f1fd4544 | 1652 | } |
6434abbf | 1653 | |
f1fd4544 | 1654 | *p = data; |
c27c9cb4 DSH |
1655 | |
1656 | ri_check: | |
1657 | ||
1658 | /* Need RI if renegotiating */ | |
1659 | ||
bdd53508 | 1660 | if (!renegotiate_seen && s->renegotiate && |
c27c9cb4 DSH |
1661 | !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) |
1662 | { | |
fbed9f81 | 1663 | *al = SSL_AD_HANDSHAKE_FAILURE; |
aa09c2c6 | 1664 | SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, |
c27c9cb4 DSH |
1665 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
1666 | return 0; | |
1667 | } | |
1668 | ||
f1fd4544 | 1669 | return 1; |
52b8dad8 | 1670 | } |
f1fd4544 | 1671 | |
b2284ed3 DSH |
1672 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n) |
1673 | { | |
1674 | int al = -1; | |
1675 | if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0) | |
1676 | { | |
1677 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | if (ssl_check_clienthello_tlsext(s) <= 0) | |
1682 | { | |
aa09c2c6 | 1683 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT); |
b2284ed3 DSH |
1684 | return 0; |
1685 | } | |
1686 | return 1; | |
1687 | } | |
1688 | ||
bf48836c | 1689 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1690 | /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No |
1691 | * elements of zero length are allowed and the set of elements must exactly fill | |
1692 | * the length of the block. */ | |
bf48836c | 1693 | static int ssl_next_proto_validate(unsigned char *d, unsigned len) |
ee2ffc27 BL |
1694 | { |
1695 | unsigned int off = 0; | |
1696 | ||
1697 | while (off < len) | |
1698 | { | |
1699 | if (d[off] == 0) | |
1700 | return 0; | |
1701 | off += d[off]; | |
1702 | off++; | |
1703 | } | |
1704 | ||
1705 | return off == len; | |
1706 | } | |
1707 | #endif | |
1708 | ||
f1fd4544 BM |
1709 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
1710 | { | |
c8bbd98a | 1711 | unsigned short length; |
ed3883d2 BM |
1712 | unsigned short type; |
1713 | unsigned short size; | |
ed3883d2 | 1714 | unsigned char *data = *p; |
ed3883d2 | 1715 | int tlsext_servername = 0; |
860c3dd1 | 1716 | int renegotiate_seen = 0; |
ed3883d2 | 1717 | |
6f31dd72 BM |
1718 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1719 | s->s3->next_proto_neg_seen = 0; | |
1720 | #endif | |
1721 | ||
4817504d DSH |
1722 | #ifndef OPENSSL_NO_HEARTBEATS |
1723 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
1724 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
1725 | #endif | |
1726 | ||
ed3883d2 | 1727 | if (data >= (d+n-2)) |
c27c9cb4 | 1728 | goto ri_check; |
ed3883d2 | 1729 | |
c8bbd98a BL |
1730 | n2s(data,length); |
1731 | if (data+length != d+n) | |
1732 | { | |
1733 | *al = SSL_AD_DECODE_ERROR; | |
1734 | return 0; | |
1735 | } | |
ed3883d2 | 1736 | |
f1fd4544 BM |
1737 | while(data <= (d+n-4)) |
1738 | { | |
ed3883d2 BM |
1739 | n2s(data,type); |
1740 | n2s(data,size); | |
1741 | ||
1742 | if (data+size > (d+n)) | |
c27c9cb4 | 1743 | goto ri_check; |
f1fd4544 | 1744 | |
6434abbf DSH |
1745 | if (s->tlsext_debug_cb) |
1746 | s->tlsext_debug_cb(s, 1, type, data, size, | |
1747 | s->tlsext_debug_arg); | |
1748 | ||
f1fd4544 BM |
1749 | if (type == TLSEXT_TYPE_server_name) |
1750 | { | |
1751 | if (s->tlsext_hostname == NULL || size > 0) | |
1752 | { | |
1753 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
1754 | return 0; | |
1755 | } | |
ed3883d2 | 1756 | tlsext_servername = 1; |
f1fd4544 | 1757 | } |
ed3883d2 | 1758 | |
36ca4ba6 | 1759 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
1760 | else if (type == TLSEXT_TYPE_ec_point_formats && |
1761 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
1762 | { |
1763 | unsigned char *sdata = data; | |
1764 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
1765 | |
1766 | if (ecpointformatlist_length != size - 1) | |
1767 | { | |
1768 | *al = TLS1_AD_DECODE_ERROR; | |
1769 | return 0; | |
1770 | } | |
1771 | s->session->tlsext_ecpointformatlist_length = 0; | |
b6acb8d0 | 1772 | if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); |
36ca4ba6 BM |
1773 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) |
1774 | { | |
1775 | *al = TLS1_AD_INTERNAL_ERROR; | |
1776 | return 0; | |
1777 | } | |
1778 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
1779 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
1780 | #if 0 | |
1781 | fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); | |
1782 | sdata = s->session->tlsext_ecpointformatlist; | |
1783 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
1784 | fprintf(stderr,"%i ",*(sdata++)); | |
1785 | fprintf(stderr,"\n"); | |
1786 | #endif | |
1787 | } | |
c6a27f01 | 1788 | #endif /* OPENSSL_NO_EC */ |
6434abbf DSH |
1789 | |
1790 | else if (type == TLSEXT_TYPE_session_ticket) | |
1791 | { | |
12bf56c0 DSH |
1792 | if (s->tls_session_ticket_ext_cb && |
1793 | !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) | |
1794 | { | |
1795 | *al = TLS1_AD_INTERNAL_ERROR; | |
1796 | return 0; | |
1797 | } | |
6434abbf DSH |
1798 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) |
1799 | || (size > 0)) | |
1800 | { | |
1801 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
1802 | return 0; | |
1803 | } | |
1804 | s->tlsext_ticket_expected = 1; | |
1805 | } | |
761772d7 | 1806 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
1807 | else if (type == TLSEXT_TYPE_opaque_prf_input && |
1808 | s->version != DTLS1_VERSION) | |
761772d7 BM |
1809 | { |
1810 | unsigned char *sdata = data; | |
1811 | ||
1812 | if (size < 2) | |
1813 | { | |
1814 | *al = SSL_AD_DECODE_ERROR; | |
1815 | return 0; | |
1816 | } | |
1817 | n2s(sdata, s->s3->server_opaque_prf_input_len); | |
1818 | if (s->s3->server_opaque_prf_input_len != size - 2) | |
1819 | { | |
1820 | *al = SSL_AD_DECODE_ERROR; | |
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1825 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
02c27b11 BM |
1826 | if (s->s3->server_opaque_prf_input_len == 0) |
1827 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1828 | else | |
1829 | s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); | |
761772d7 BM |
1830 | |
1831 | if (s->s3->server_opaque_prf_input == NULL) | |
1832 | { | |
1833 | *al = TLS1_AD_INTERNAL_ERROR; | |
1834 | return 0; | |
1835 | } | |
1836 | } | |
1837 | #endif | |
8025e251 DSH |
1838 | else if (type == TLSEXT_TYPE_status_request && |
1839 | s->version != DTLS1_VERSION) | |
67c8e7f4 DSH |
1840 | { |
1841 | /* MUST be empty and only sent if we've requested | |
1842 | * a status request message. | |
1843 | */ | |
1844 | if ((s->tlsext_status_type == -1) || (size > 0)) | |
1845 | { | |
1846 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
1847 | return 0; | |
1848 | } | |
1849 | /* Set flag to expect CertificateStatus message */ | |
1850 | s->tlsext_status_expected = 1; | |
1851 | } | |
bf48836c | 1852 | #ifndef OPENSSL_NO_NEXTPROTONEG |
6f31dd72 BM |
1853 | else if (type == TLSEXT_TYPE_next_proto_neg && |
1854 | s->s3->tmp.finish_md_len == 0) | |
ee2ffc27 BL |
1855 | { |
1856 | unsigned char *selected; | |
1857 | unsigned char selected_len; | |
1858 | ||
1859 | /* We must have requested it. */ | |
1860 | if ((s->ctx->next_proto_select_cb == NULL)) | |
1861 | { | |
1862 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
1863 | return 0; | |
1864 | } | |
1865 | /* The data must be valid */ | |
1866 | if (!ssl_next_proto_validate(data, size)) | |
1867 | { | |
1868 | *al = TLS1_AD_DECODE_ERROR; | |
1869 | return 0; | |
1870 | } | |
1871 | if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK) | |
1872 | { | |
1873 | *al = TLS1_AD_INTERNAL_ERROR; | |
1874 | return 0; | |
1875 | } | |
1876 | s->next_proto_negotiated = OPENSSL_malloc(selected_len); | |
1877 | if (!s->next_proto_negotiated) | |
1878 | { | |
1879 | *al = TLS1_AD_INTERNAL_ERROR; | |
1880 | return 0; | |
1881 | } | |
1882 | memcpy(s->next_proto_negotiated, selected, selected_len); | |
1883 | s->next_proto_negotiated_len = selected_len; | |
6f31dd72 | 1884 | s->s3->next_proto_neg_seen = 1; |
ee2ffc27 BL |
1885 | } |
1886 | #endif | |
860c3dd1 DSH |
1887 | else if (type == TLSEXT_TYPE_renegotiate) |
1888 | { | |
1889 | if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) | |
1890 | return 0; | |
1891 | renegotiate_seen = 1; | |
1892 | } | |
4817504d DSH |
1893 | #ifndef OPENSSL_NO_HEARTBEATS |
1894 | else if (type == TLSEXT_TYPE_heartbeat) | |
1895 | { | |
1896 | switch(data[0]) | |
1897 | { | |
1898 | case 0x01: /* Server allows us to send HB requests */ | |
1899 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1900 | break; | |
1901 | case 0x02: /* Server doesn't accept HB requests */ | |
1902 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1903 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1904 | break; | |
192540b5 DSH |
1905 | default: *al = SSL_AD_ILLEGAL_PARAMETER; |
1906 | return 0; | |
4817504d DSH |
1907 | } |
1908 | } | |
1909 | #endif | |
333f926d BL |
1910 | else if (type == TLSEXT_TYPE_use_srtp) |
1911 | { | |
1912 | if(ssl_parse_serverhello_use_srtp_ext(s, data, size, | |
1913 | al)) | |
1914 | return 0; | |
1915 | } | |
1916 | ||
ed3883d2 | 1917 | data+=size; |
f1fd4544 | 1918 | } |
ed3883d2 BM |
1919 | |
1920 | if (data != d+n) | |
f1fd4544 BM |
1921 | { |
1922 | *al = SSL_AD_DECODE_ERROR; | |
1923 | return 0; | |
1924 | } | |
ed3883d2 | 1925 | |
f1fd4544 BM |
1926 | if (!s->hit && tlsext_servername == 1) |
1927 | { | |
1928 | if (s->tlsext_hostname) | |
1929 | { | |
1930 | if (s->session->tlsext_hostname == NULL) | |
1931 | { | |
ed3883d2 BM |
1932 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); |
1933 | if (!s->session->tlsext_hostname) | |
f1fd4544 BM |
1934 | { |
1935 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
1936 | return 0; | |
1937 | } | |
1938 | } | |
1939 | else | |
1940 | { | |
1941 | *al = SSL_AD_DECODE_ERROR; | |
1942 | return 0; | |
1943 | } | |
ed3883d2 | 1944 | } |
f1fd4544 | 1945 | } |
ed3883d2 | 1946 | |
f1fd4544 | 1947 | *p = data; |
c27c9cb4 DSH |
1948 | |
1949 | ri_check: | |
1950 | ||
1951 | /* Determine if we need to see RI. Strictly speaking if we want to | |
1952 | * avoid an attack we should *always* see RI even on initial server | |
1953 | * hello because the client doesn't see any renegotiation during an | |
1954 | * attack. However this would mean we could not connect to any server | |
1955 | * which doesn't support RI so for the immediate future tolerate RI | |
1956 | * absence on initial connect only. | |
1957 | */ | |
c2c49969 DSH |
1958 | if (!renegotiate_seen |
1959 | && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
ef51b4b9 | 1960 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) |
c27c9cb4 | 1961 | { |
fbed9f81 | 1962 | *al = SSL_AD_HANDSHAKE_FAILURE; |
c27c9cb4 DSH |
1963 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, |
1964 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
1965 | return 0; | |
1966 | } | |
1967 | ||
f1fd4544 | 1968 | return 1; |
52b8dad8 | 1969 | } |
ed3883d2 | 1970 | |
b2172f4f | 1971 | |
36ca4ba6 BM |
1972 | int ssl_prepare_clienthello_tlsext(SSL *s) |
1973 | { | |
761772d7 BM |
1974 | |
1975 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
1976 | { | |
1977 | int r = 1; | |
1978 | ||
1979 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
1980 | { | |
1981 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
1982 | if (!r) | |
1983 | return -1; | |
1984 | } | |
1985 | ||
1986 | if (s->tlsext_opaque_prf_input != NULL) | |
1987 | { | |
1988 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1989 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
1990 | ||
02c27b11 BM |
1991 | if (s->tlsext_opaque_prf_input_len == 0) |
1992 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1993 | else | |
1994 | s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
1995 | if (s->s3->client_opaque_prf_input == NULL) |
1996 | { | |
1997 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); | |
1998 | return -1; | |
1999 | } | |
2000 | s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2001 | } | |
2002 | ||
2003 | if (r == 2) | |
2004 | /* at callback's request, insist on receiving an appropriate server opaque PRF input */ | |
2005 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2006 | } | |
2007 | #endif | |
2008 | ||
36ca4ba6 | 2009 | return 1; |
52b8dad8 | 2010 | } |
36ca4ba6 BM |
2011 | |
2012 | int ssl_prepare_serverhello_tlsext(SSL *s) | |
2013 | { | |
2014 | #ifndef OPENSSL_NO_EC | |
b6acb8d0 | 2015 | /* If we are server and using an ECC cipher suite, send the point formats we support |
33273721 BM |
2016 | * if the client sent us an ECPointsFormat extension. Note that the server is not |
2017 | * supposed to send an EllipticCurves extension. | |
36ca4ba6 | 2018 | */ |
36ca4ba6 | 2019 | |
52b8dad8 BM |
2020 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
2021 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2022 | int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); | |
2023 | using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); | |
2024 | ||
36ca4ba6 BM |
2025 | if (using_ecc) |
2026 | { | |
b6acb8d0 BM |
2027 | if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); |
2028 | if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) | |
36ca4ba6 | 2029 | { |
a291745e | 2030 | SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); |
36ca4ba6 BM |
2031 | return -1; |
2032 | } | |
b6acb8d0 BM |
2033 | s->tlsext_ecpointformatlist_length = 3; |
2034 | s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; | |
2035 | s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
2036 | s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
36ca4ba6 BM |
2037 | } |
2038 | #endif /* OPENSSL_NO_EC */ | |
761772d7 | 2039 | |
36ca4ba6 | 2040 | return 1; |
52b8dad8 | 2041 | } |
36ca4ba6 BM |
2042 | |
2043 | int ssl_check_clienthello_tlsext(SSL *s) | |
f1fd4544 | 2044 | { |
241520e6 | 2045 | int ret=SSL_TLSEXT_ERR_NOACK; |
36ca4ba6 BM |
2046 | int al = SSL_AD_UNRECOGNIZED_NAME; |
2047 | ||
2048 | #ifndef OPENSSL_NO_EC | |
33273721 BM |
2049 | /* The handling of the ECPointFormats extension is done elsewhere, namely in |
2050 | * ssl3_choose_cipher in s3_lib.c. | |
2051 | */ | |
2052 | /* The handling of the EllipticCurves extension is done elsewhere, namely in | |
2053 | * ssl3_choose_cipher in s3_lib.c. | |
36ca4ba6 BM |
2054 | */ |
2055 | #endif | |
2056 | ||
2057 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
2058 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
2059 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
2060 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
2061 | ||
67c8e7f4 DSH |
2062 | /* If status request then ask callback what to do. |
2063 | * Note: this must be called after servername callbacks in case | |
2064 | * the certificate has changed. | |
2065 | */ | |
2bd45dc9 | 2066 | if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) |
67c8e7f4 DSH |
2067 | { |
2068 | int r; | |
2069 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
2070 | switch (r) | |
2071 | { | |
2072 | /* We don't want to send a status request response */ | |
2073 | case SSL_TLSEXT_ERR_NOACK: | |
2074 | s->tlsext_status_expected = 0; | |
2075 | break; | |
2076 | /* status request response should be sent */ | |
2077 | case SSL_TLSEXT_ERR_OK: | |
2078 | if (s->tlsext_ocsp_resp) | |
2079 | s->tlsext_status_expected = 1; | |
2080 | else | |
2081 | s->tlsext_status_expected = 0; | |
2082 | break; | |
2083 | /* something bad happened */ | |
2084 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
2085 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2086 | al = SSL_AD_INTERNAL_ERROR; | |
2087 | goto err; | |
2088 | } | |
2089 | } | |
2090 | else | |
2091 | s->tlsext_status_expected = 0; | |
761772d7 BM |
2092 | |
2093 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
2094 | { | |
2095 | /* This sort of belongs into ssl_prepare_serverhello_tlsext(), | |
2096 | * but we might be sending an alert in response to the client hello, | |
2097 | * so this has to happen here in ssl_check_clienthello_tlsext(). */ | |
2098 | ||
2099 | int r = 1; | |
2100 | ||
2101 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
2102 | { | |
2103 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
2104 | if (!r) | |
2105 | { | |
2106 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2107 | al = SSL_AD_INTERNAL_ERROR; | |
2108 | goto err; | |
2109 | } | |
2110 | } | |
2111 | ||
2112 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
2113 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
2114 | s->s3->server_opaque_prf_input = NULL; | |
2115 | ||
2116 | if (s->tlsext_opaque_prf_input != NULL) | |
2117 | { | |
2118 | if (s->s3->client_opaque_prf_input != NULL && | |
2119 | s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) | |
2120 | { | |
2121 | /* can only use this extension if we have a server opaque PRF input | |
2122 | * of the same length as the client opaque PRF input! */ | |
2123 | ||
02c27b11 BM |
2124 | if (s->tlsext_opaque_prf_input_len == 0) |
2125 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
2126 | else | |
2127 | s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
2128 | if (s->s3->server_opaque_prf_input == NULL) |
2129 | { | |
2130 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2131 | al = SSL_AD_INTERNAL_ERROR; | |
2132 | goto err; | |
2133 | } | |
2134 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2135 | } | |
2136 | } | |
2137 | ||
2138 | if (r == 2 && s->s3->server_opaque_prf_input == NULL) | |
2139 | { | |
2140 | /* The callback wants to enforce use of the extension, | |
2141 | * but we can't do that with the client opaque PRF input; | |
2142 | * abort the handshake. | |
2143 | */ | |
2144 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2145 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2146 | } | |
2147 | } | |
761772d7 | 2148 | |
67c8e7f4 | 2149 | #endif |
761772d7 | 2150 | err: |
52b8dad8 BM |
2151 | switch (ret) |
2152 | { | |
36ca4ba6 BM |
2153 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
2154 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
2155 | return -1; | |
2156 | ||
2157 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2158 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
2159 | return 1; | |
2160 | ||
2161 | case SSL_TLSEXT_ERR_NOACK: | |
2162 | s->servername_done=0; | |
2163 | default: | |
2164 | return 1; | |
52b8dad8 | 2165 | } |
36ca4ba6 | 2166 | } |
f1fd4544 | 2167 | |
36ca4ba6 BM |
2168 | int ssl_check_serverhello_tlsext(SSL *s) |
2169 | { | |
2170 | int ret=SSL_TLSEXT_ERR_NOACK; | |
58ece833 | 2171 | int al = SSL_AD_UNRECOGNIZED_NAME; |
241520e6 | 2172 | |
36ca4ba6 | 2173 | #ifndef OPENSSL_NO_EC |
d0205686 DSH |
2174 | /* If we are client and using an elliptic curve cryptography cipher |
2175 | * suite, then if server returns an EC point formats lists extension | |
2176 | * it must contain uncompressed. | |
36ca4ba6 | 2177 | */ |
52b8dad8 BM |
2178 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
2179 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
36ca4ba6 | 2180 | if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && |
d0205686 | 2181 | (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) && |
52b8dad8 | 2182 | ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) |
36ca4ba6 BM |
2183 | { |
2184 | /* we are using an ECC cipher */ | |
90bdfd97 | 2185 | size_t i; |
36ca4ba6 BM |
2186 | unsigned char *list; |
2187 | int found_uncompressed = 0; | |
b9865f11 | 2188 | list = s->session->tlsext_ecpointformatlist; |
36ca4ba6 BM |
2189 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) |
2190 | { | |
2191 | if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) | |
2192 | { | |
2193 | found_uncompressed = 1; | |
2194 | break; | |
2195 | } | |
2196 | } | |
2197 | if (!found_uncompressed) | |
2198 | { | |
a291745e | 2199 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
36ca4ba6 BM |
2200 | return -1; |
2201 | } | |
2202 | } | |
2203 | ret = SSL_TLSEXT_ERR_OK; | |
2204 | #endif /* OPENSSL_NO_EC */ | |
2205 | ||
241520e6 | 2206 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) |
58ece833 | 2207 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); |
241520e6 | 2208 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) |
58ece833 | 2209 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); |
241520e6 | 2210 | |
761772d7 BM |
2211 | #ifdef TLSEXT_TYPE_opaque_prf_input |
2212 | if (s->s3->server_opaque_prf_input_len > 0) | |
2213 | { | |
2214 | /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. | |
2215 | * So first verify that we really have a value from the server too. */ | |
2216 | ||
2217 | if (s->s3->server_opaque_prf_input == NULL) | |
2218 | { | |
2219 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2220 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2221 | } | |
2222 | ||
2223 | /* Anytime the server *has* sent an opaque PRF input, we need to check | |
2224 | * that we have a client opaque PRF input of the same size. */ | |
2225 | if (s->s3->client_opaque_prf_input == NULL || | |
2226 | s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) | |
2227 | { | |
2228 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2229 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2230 | } | |
2231 | } | |
2232 | #endif | |
2233 | ||
04e2ab2c DSH |
2234 | /* If we've requested certificate status and we wont get one |
2235 | * tell the callback | |
2236 | */ | |
2237 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
121f9e74 | 2238 | && s->ctx && s->ctx->tlsext_status_cb) |
04e2ab2c DSH |
2239 | { |
2240 | int r; | |
2241 | /* Set resp to NULL, resplen to -1 so callback knows | |
2242 | * there is no response. | |
2243 | */ | |
2244 | if (s->tlsext_ocsp_resp) | |
2245 | { | |
2246 | OPENSSL_free(s->tlsext_ocsp_resp); | |
2247 | s->tlsext_ocsp_resp = NULL; | |
2248 | } | |
2249 | s->tlsext_ocsp_resplen = -1; | |
2250 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
2251 | if (r == 0) | |
2252 | { | |
2253 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
2254 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2255 | } | |
2256 | if (r < 0) | |
2257 | { | |
2258 | al = SSL_AD_INTERNAL_ERROR; | |
2259 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2260 | } | |
2261 | } | |
2262 | ||
52b8dad8 BM |
2263 | switch (ret) |
2264 | { | |
58ece833 BM |
2265 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
2266 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
2267 | return -1; | |
2268 | ||
2269 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2270 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
2271 | return 1; | |
2272 | ||
2273 | case SSL_TLSEXT_ERR_NOACK: | |
2274 | s->servername_done=0; | |
2275 | default: | |
2276 | return 1; | |
52b8dad8 | 2277 | } |
f1fd4544 | 2278 | } |
33273721 | 2279 | |
c519e89f BM |
2280 | /* Since the server cache lookup is done early on in the processing of the |
2281 | * ClientHello, and other operations depend on the result, we need to handle | |
2282 | * any TLS session ticket extension at the same time. | |
2283 | * | |
2284 | * session_id: points at the session ID in the ClientHello. This code will | |
2285 | * read past the end of this in order to parse out the session ticket | |
2286 | * extension, if any. | |
2287 | * len: the length of the session ID. | |
2288 | * limit: a pointer to the first byte after the ClientHello. | |
2289 | * ret: (output) on return, if a ticket was decrypted, then this is set to | |
2290 | * point to the resulting session. | |
2291 | * | |
2292 | * If s->tls_session_secret_cb is set then we are expecting a pre-shared key | |
2293 | * ciphersuite, in which case we have no use for session tickets and one will | |
2294 | * never be decrypted, nor will s->tlsext_ticket_expected be set to 1. | |
2295 | * | |
2296 | * Returns: | |
2297 | * -1: fatal error, either from parsing or decrypting the ticket. | |
2298 | * 0: no ticket was found (or was ignored, based on settings). | |
2299 | * 1: a zero length extension was found, indicating that the client supports | |
2300 | * session tickets but doesn't currently have one to offer. | |
2301 | * 2: either s->tls_session_secret_cb was set, or a ticket was offered but | |
2302 | * couldn't be decrypted because of a non-fatal error. | |
2303 | * 3: a ticket was successfully decrypted and *ret was set. | |
2304 | * | |
2305 | * Side effects: | |
2306 | * Sets s->tlsext_ticket_expected to 1 if the server will have to issue | |
2307 | * a new session ticket to the client because the client indicated support | |
2308 | * (and s->tls_session_secret_cb is NULL) but the client either doesn't have | |
2309 | * a session ticket or we couldn't use the one it gave us, or if | |
2310 | * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket. | |
2311 | * Otherwise, s->tlsext_ticket_expected is set to 0. | |
6434abbf | 2312 | */ |
6434abbf | 2313 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, |
c519e89f | 2314 | const unsigned char *limit, SSL_SESSION **ret) |
6434abbf DSH |
2315 | { |
2316 | /* Point after session ID in client hello */ | |
2317 | const unsigned char *p = session_id + len; | |
2318 | unsigned short i; | |
e8da6a1d | 2319 | |
c519e89f BM |
2320 | *ret = NULL; |
2321 | s->tlsext_ticket_expected = 0; | |
2322 | ||
e8da6a1d | 2323 | /* If tickets disabled behave as if no ticket present |
c519e89f BM |
2324 | * to permit stateful resumption. |
2325 | */ | |
e8da6a1d | 2326 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) |
c519e89f | 2327 | return 0; |
6434abbf | 2328 | if ((s->version <= SSL3_VERSION) || !limit) |
c519e89f | 2329 | return 0; |
6434abbf DSH |
2330 | if (p >= limit) |
2331 | return -1; | |
07a9d1a2 DSH |
2332 | /* Skip past DTLS cookie */ |
2333 | if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) | |
2334 | { | |
2335 | i = *(p++); | |
2336 | p+= i; | |
2337 | if (p >= limit) | |
2338 | return -1; | |
2339 | } | |
6434abbf DSH |
2340 | /* Skip past cipher list */ |
2341 | n2s(p, i); | |
2342 | p+= i; | |
2343 | if (p >= limit) | |
2344 | return -1; | |
2345 | /* Skip past compression algorithm list */ | |
2346 | i = *(p++); | |
2347 | p += i; | |
2348 | if (p > limit) | |
2349 | return -1; | |
2350 | /* Now at start of extensions */ | |
2351 | if ((p + 2) >= limit) | |
c519e89f | 2352 | return 0; |
6434abbf DSH |
2353 | n2s(p, i); |
2354 | while ((p + 4) <= limit) | |
2355 | { | |
2356 | unsigned short type, size; | |
2357 | n2s(p, type); | |
2358 | n2s(p, size); | |
2359 | if (p + size > limit) | |
c519e89f | 2360 | return 0; |
6434abbf DSH |
2361 | if (type == TLSEXT_TYPE_session_ticket) |
2362 | { | |
c519e89f | 2363 | int r; |
6434abbf DSH |
2364 | if (size == 0) |
2365 | { | |
c519e89f BM |
2366 | /* The client will accept a ticket but doesn't |
2367 | * currently have one. */ | |
6434abbf | 2368 | s->tlsext_ticket_expected = 1; |
c519e89f | 2369 | return 1; |
6434abbf | 2370 | } |
12bf56c0 DSH |
2371 | if (s->tls_session_secret_cb) |
2372 | { | |
c519e89f BM |
2373 | /* Indicate that the ticket couldn't be |
2374 | * decrypted rather than generating the session | |
2375 | * from ticket now, trigger abbreviated | |
2376 | * handshake based on external mechanism to | |
2377 | * calculate the master secret later. */ | |
2378 | return 2; | |
2379 | } | |
2380 | r = tls_decrypt_ticket(s, p, size, session_id, len, ret); | |
2381 | switch (r) | |
2382 | { | |
2383 | case 2: /* ticket couldn't be decrypted */ | |
2384 | s->tlsext_ticket_expected = 1; | |
2385 | return 2; | |
2386 | case 3: /* ticket was decrypted */ | |
2387 | return r; | |
2388 | case 4: /* ticket decrypted but need to renew */ | |
2389 | s->tlsext_ticket_expected = 1; | |
2390 | return 3; | |
2391 | default: /* fatal error */ | |
2392 | return -1; | |
12bf56c0 | 2393 | } |
6434abbf DSH |
2394 | } |
2395 | p += size; | |
2396 | } | |
c519e89f | 2397 | return 0; |
6434abbf DSH |
2398 | } |
2399 | ||
c519e89f BM |
2400 | /* tls_decrypt_ticket attempts to decrypt a session ticket. |
2401 | * | |
2402 | * etick: points to the body of the session ticket extension. | |
2403 | * eticklen: the length of the session tickets extenion. | |
2404 | * sess_id: points at the session ID. | |
2405 | * sesslen: the length of the session ID. | |
2406 | * psess: (output) on return, if a ticket was decrypted, then this is set to | |
2407 | * point to the resulting session. | |
2408 | * | |
2409 | * Returns: | |
2410 | * -1: fatal error, either from parsing or decrypting the ticket. | |
2411 | * 2: the ticket couldn't be decrypted. | |
2412 | * 3: a ticket was successfully decrypted and *psess was set. | |
2413 | * 4: same as 3, but the ticket needs to be renewed. | |
2414 | */ | |
6434abbf DSH |
2415 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, |
2416 | const unsigned char *sess_id, int sesslen, | |
2417 | SSL_SESSION **psess) | |
2418 | { | |
2419 | SSL_SESSION *sess; | |
2420 | unsigned char *sdec; | |
2421 | const unsigned char *p; | |
8a2062fe | 2422 | int slen, mlen, renew_ticket = 0; |
6434abbf DSH |
2423 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; |
2424 | HMAC_CTX hctx; | |
2425 | EVP_CIPHER_CTX ctx; | |
661dc143 | 2426 | SSL_CTX *tctx = s->initial_ctx; |
8a2062fe DSH |
2427 | /* Need at least keyname + iv + some encrypted data */ |
2428 | if (eticklen < 48) | |
c519e89f | 2429 | return 2; |
8a2062fe DSH |
2430 | /* Initialize session ticket encryption and HMAC contexts */ |
2431 | HMAC_CTX_init(&hctx); | |
2432 | EVP_CIPHER_CTX_init(&ctx); | |
661dc143 | 2433 | if (tctx->tlsext_ticket_key_cb) |
8a2062fe DSH |
2434 | { |
2435 | unsigned char *nctick = (unsigned char *)etick; | |
661dc143 | 2436 | int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, |
8a2062fe DSH |
2437 | &ctx, &hctx, 0); |
2438 | if (rv < 0) | |
2439 | return -1; | |
2440 | if (rv == 0) | |
c519e89f | 2441 | return 2; |
8a2062fe DSH |
2442 | if (rv == 2) |
2443 | renew_ticket = 1; | |
2444 | } | |
2445 | else | |
2446 | { | |
2447 | /* Check key name matches */ | |
661dc143 | 2448 | if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) |
c519e89f | 2449 | return 2; |
661dc143 | 2450 | HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
8a2062fe DSH |
2451 | tlsext_tick_md(), NULL); |
2452 | EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
661dc143 | 2453 | tctx->tlsext_tick_aes_key, etick + 16); |
8a2062fe | 2454 | } |
6434abbf | 2455 | /* Attempt to process session ticket, first conduct sanity and |
c519e89f BM |
2456 | * integrity checks on ticket. |
2457 | */ | |
8a2062fe | 2458 | mlen = HMAC_size(&hctx); |
0eab41fb BL |
2459 | if (mlen < 0) |
2460 | { | |
2461 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2462 | return -1; | |
2463 | } | |
6434abbf | 2464 | eticklen -= mlen; |
6434abbf | 2465 | /* Check HMAC of encrypted ticket */ |
6434abbf DSH |
2466 | HMAC_Update(&hctx, etick, eticklen); |
2467 | HMAC_Final(&hctx, tick_hmac, NULL); | |
2468 | HMAC_CTX_cleanup(&hctx); | |
2469 | if (memcmp(tick_hmac, etick + eticklen, mlen)) | |
c519e89f | 2470 | return 2; |
6434abbf | 2471 | /* Attempt to decrypt session data */ |
6434abbf | 2472 | /* Move p after IV to start of encrypted ticket, update length */ |
8a2062fe DSH |
2473 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); |
2474 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
6434abbf DSH |
2475 | sdec = OPENSSL_malloc(eticklen); |
2476 | if (!sdec) | |
2477 | { | |
2478 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2479 | return -1; | |
2480 | } | |
2481 | EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); | |
2482 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) | |
c519e89f | 2483 | return 2; |
6434abbf DSH |
2484 | slen += mlen; |
2485 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2486 | p = sdec; | |
c519e89f | 2487 | |
6434abbf DSH |
2488 | sess = d2i_SSL_SESSION(NULL, &p, slen); |
2489 | OPENSSL_free(sdec); | |
2490 | if (sess) | |
2491 | { | |
c519e89f BM |
2492 | /* The session ID, if non-empty, is used by some clients to |
2493 | * detect that the ticket has been accepted. So we copy it to | |
2494 | * the session structure. If it is empty set length to zero | |
2495 | * as required by standard. | |
2496 | */ | |
6434abbf DSH |
2497 | if (sesslen) |
2498 | memcpy(sess->session_id, sess_id, sesslen); | |
2499 | sess->session_id_length = sesslen; | |
2500 | *psess = sess; | |
c519e89f BM |
2501 | if (renew_ticket) |
2502 | return 4; | |
2503 | else | |
2504 | return 3; | |
6434abbf | 2505 | } |
c519e89f BM |
2506 | ERR_clear_error(); |
2507 | /* For session parse failure, indicate that we need to send a new | |
2508 | * ticket. */ | |
2509 | return 2; | |
6434abbf | 2510 | } |
6434abbf | 2511 | |
6b7be581 DSH |
2512 | /* Tables to translate from NIDs to TLS v1.2 ids */ |
2513 | ||
2514 | typedef struct | |
2515 | { | |
2516 | int nid; | |
2517 | int id; | |
2518 | } tls12_lookup; | |
2519 | ||
2520 | static tls12_lookup tls12_md[] = { | |
6b7be581 | 2521 | {NID_md5, TLSEXT_hash_md5}, |
6b7be581 | 2522 | {NID_sha1, TLSEXT_hash_sha1}, |
6b7be581 DSH |
2523 | {NID_sha224, TLSEXT_hash_sha224}, |
2524 | {NID_sha256, TLSEXT_hash_sha256}, | |
6b7be581 DSH |
2525 | {NID_sha384, TLSEXT_hash_sha384}, |
2526 | {NID_sha512, TLSEXT_hash_sha512} | |
6b7be581 DSH |
2527 | }; |
2528 | ||
2529 | static tls12_lookup tls12_sig[] = { | |
6b7be581 | 2530 | {EVP_PKEY_RSA, TLSEXT_signature_rsa}, |
6b7be581 | 2531 | {EVP_PKEY_DSA, TLSEXT_signature_dsa}, |
6b7be581 | 2532 | {EVP_PKEY_EC, TLSEXT_signature_ecdsa} |
6b7be581 DSH |
2533 | }; |
2534 | ||
2535 | static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen) | |
2536 | { | |
2537 | size_t i; | |
2538 | for (i = 0; i < tlen; i++) | |
2539 | { | |
2540 | if (table[i].nid == nid) | |
2541 | return table[i].id; | |
2542 | } | |
2543 | return -1; | |
2544 | } | |
e7f8ff43 | 2545 | |
6b7be581 DSH |
2546 | static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen) |
2547 | { | |
2548 | size_t i; | |
2549 | for (i = 0; i < tlen; i++) | |
2550 | { | |
e7f8ff43 | 2551 | if ((table[i].id) == id) |
6b7be581 DSH |
2552 | return table[i].nid; |
2553 | } | |
e7f8ff43 | 2554 | return NID_undef; |
6b7be581 | 2555 | } |
a2f9200f DSH |
2556 | |
2557 | int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md) | |
6b7be581 DSH |
2558 | { |
2559 | int sig_id, md_id; | |
1db5f356 DSH |
2560 | if (!md) |
2561 | return 0; | |
6b7be581 DSH |
2562 | md_id = tls12_find_id(EVP_MD_type(md), tls12_md, |
2563 | sizeof(tls12_md)/sizeof(tls12_lookup)); | |
2564 | if (md_id == -1) | |
2565 | return 0; | |
a2f9200f | 2566 | sig_id = tls12_get_sigid(pk); |
6b7be581 DSH |
2567 | if (sig_id == -1) |
2568 | return 0; | |
2569 | p[0] = (unsigned char)md_id; | |
2570 | p[1] = (unsigned char)sig_id; | |
2571 | return 1; | |
2572 | } | |
2573 | ||
a2f9200f DSH |
2574 | int tls12_get_sigid(const EVP_PKEY *pk) |
2575 | { | |
2576 | return tls12_find_id(pk->type, tls12_sig, | |
2577 | sizeof(tls12_sig)/sizeof(tls12_lookup)); | |
2578 | } | |
2579 | ||
2580 | const EVP_MD *tls12_get_hash(unsigned char hash_alg) | |
2581 | { | |
2582 | switch(hash_alg) | |
2583 | { | |
2584 | #ifndef OPENSSL_NO_MD5 | |
2585 | case TLSEXT_hash_md5: | |
ebc5e72f DSH |
2586 | #ifdef OPENSSL_FIPS |
2587 | if (FIPS_mode()) | |
2588 | return NULL; | |
2589 | #endif | |
a2f9200f DSH |
2590 | return EVP_md5(); |
2591 | #endif | |
2592 | #ifndef OPENSSL_NO_SHA | |
2593 | case TLSEXT_hash_sha1: | |
2594 | return EVP_sha1(); | |
2595 | #endif | |
2596 | #ifndef OPENSSL_NO_SHA256 | |
2597 | case TLSEXT_hash_sha224: | |
2598 | return EVP_sha224(); | |
2599 | ||
2600 | case TLSEXT_hash_sha256: | |
2601 | return EVP_sha256(); | |
2602 | #endif | |
2603 | #ifndef OPENSSL_NO_SHA512 | |
2604 | case TLSEXT_hash_sha384: | |
2605 | return EVP_sha384(); | |
2606 | ||
2607 | case TLSEXT_hash_sha512: | |
2608 | return EVP_sha512(); | |
2609 | #endif | |
2610 | default: | |
2611 | return NULL; | |
2612 | ||
2613 | } | |
2614 | } | |
2615 | ||
6b7be581 DSH |
2616 | /* Set preferred digest for each key type */ |
2617 | ||
8f829124 | 2618 | int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize) |
6b7be581 DSH |
2619 | { |
2620 | int i, idx; | |
2621 | const EVP_MD *md; | |
2622 | CERT *c = s->cert; | |
e7f8ff43 | 2623 | TLS_SIGALGS *sigptr; |
6b7be581 | 2624 | /* Extension ignored for TLS versions below 1.2 */ |
238b6361 | 2625 | if (TLS1_get_version(s) < TLS1_2_VERSION) |
6b7be581 | 2626 | return 1; |
8f829124 DSH |
2627 | /* Should never happen */ |
2628 | if (!c) | |
2629 | return 0; | |
6b7be581 DSH |
2630 | |
2631 | c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL; | |
2632 | c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL; | |
2633 | c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL; | |
2634 | c->pkeys[SSL_PKEY_ECC].digest = NULL; | |
2635 | ||
e7f8ff43 DSH |
2636 | if (c->sigalgs) |
2637 | OPENSSL_free(c->sigalgs); | |
2638 | c->sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS)); | |
2639 | if (!c->sigalgs) | |
2640 | return 0; | |
2641 | c->sigalgslen = dsize/2; | |
6b7be581 | 2642 | |
e7f8ff43 DSH |
2643 | for (i = 0, sigptr = c->sigalgs; i < dsize; i += 2, sigptr++) |
2644 | { | |
2645 | sigptr->rhash = data[i]; | |
2646 | sigptr->rsign = data[i + 1]; | |
2647 | sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md, | |
2648 | sizeof(tls12_md)/sizeof(tls12_lookup)); | |
2649 | sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig, | |
2650 | sizeof(tls12_sig)/sizeof(tls12_lookup)); | |
2651 | if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid, | |
2652 | sigptr->hash_nid, | |
2653 | sigptr->sign_nid)) | |
2654 | sigptr->signandhash_nid = NID_undef; | |
2655 | switch(sigptr->rsign) | |
6b7be581 DSH |
2656 | { |
2657 | #ifndef OPENSSL_NO_RSA | |
2658 | case TLSEXT_signature_rsa: | |
2659 | idx = SSL_PKEY_RSA_SIGN; | |
2660 | break; | |
2661 | #endif | |
2662 | #ifndef OPENSSL_NO_DSA | |
2663 | case TLSEXT_signature_dsa: | |
2664 | idx = SSL_PKEY_DSA_SIGN; | |
2665 | break; | |
2666 | #endif | |
2667 | #ifndef OPENSSL_NO_ECDSA | |
2668 | case TLSEXT_signature_ecdsa: | |
2669 | idx = SSL_PKEY_ECC; | |
2670 | break; | |
2671 | #endif | |
2672 | default: | |
2673 | continue; | |
2674 | } | |
2675 | ||
a2f9200f | 2676 | if (c->pkeys[idx].digest == NULL) |
6b7be581 | 2677 | { |
e7f8ff43 | 2678 | md = tls12_get_hash(sigptr->rhash); |
a2f9200f DSH |
2679 | if (md) |
2680 | { | |
2681 | c->pkeys[idx].digest = md; | |
2682 | if (idx == SSL_PKEY_RSA_SIGN) | |
2683 | c->pkeys[SSL_PKEY_RSA_ENC].digest = md; | |
2684 | } | |
6b7be581 DSH |
2685 | } |
2686 | ||
6b7be581 DSH |
2687 | } |
2688 | ||
8f829124 | 2689 | |
6b7be581 DSH |
2690 | /* Set any remaining keys to default values. NOTE: if alg is not |
2691 | * supported it stays as NULL. | |
2692 | */ | |
2693 | #ifndef OPENSSL_NO_DSA | |
2694 | if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest) | |
2695 | c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1(); | |
2696 | #endif | |
2697 | #ifndef OPENSSL_NO_RSA | |
2698 | if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) | |
2699 | { | |
2700 | c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1(); | |
2701 | c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1(); | |
2702 | } | |
2703 | #endif | |
2704 | #ifndef OPENSSL_NO_ECDSA | |
2705 | if (!c->pkeys[SSL_PKEY_ECC].digest) | |
2706 | c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa(); | |
2707 | #endif | |
2708 | return 1; | |
2709 | } | |
2710 | ||
6434abbf | 2711 | #endif |
4817504d | 2712 | |
e7f8ff43 DSH |
2713 | int SSL_get_sigalgs(SSL *s, int idx, |
2714 | int *psign, int *phash, int *psignandhash, | |
2715 | unsigned char *rsig, unsigned char *rhash) | |
2716 | { | |
2717 | if (s->cert->sigalgs == NULL) | |
2718 | return 0; | |
2719 | if (idx >= 0) | |
2720 | { | |
2721 | TLS_SIGALGS *psig; | |
2722 | if (idx >= (int)s->cert->sigalgslen) | |
2723 | return 0; | |
2724 | psig = s->cert->sigalgs + idx; | |
2725 | if (psign) | |
2726 | *psign = psig->sign_nid; | |
2727 | if (phash) | |
2728 | *phash = psig->hash_nid; | |
2729 | if (psignandhash) | |
2730 | *psignandhash = psig->signandhash_nid; | |
2731 | if (rsig) | |
2732 | *rsig = psig->rsign; | |
2733 | if (rhash) | |
2734 | *rhash = psig->rhash; | |
2735 | } | |
2736 | return s->cert->sigalgslen; | |
2737 | } | |
2738 | ||
2739 | ||
4817504d DSH |
2740 | #ifndef OPENSSL_NO_HEARTBEATS |
2741 | int | |
2742 | tls1_process_heartbeat(SSL *s) | |
2743 | { | |
2744 | unsigned char *p = &s->s3->rrec.data[0], *pl; | |
2745 | unsigned short hbtype; | |
2746 | unsigned int payload; | |
2747 | unsigned int padding = 16; /* Use minimum padding */ | |
2748 | ||
2749 | /* Read type and payload length first */ | |
2750 | hbtype = *p++; | |
2751 | n2s(p, payload); | |
2752 | pl = p; | |
2753 | ||
2754 | if (s->msg_callback) | |
2755 | s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT, | |
2756 | &s->s3->rrec.data[0], s->s3->rrec.length, | |
2757 | s, s->msg_callback_arg); | |
2758 | ||
2759 | if (hbtype == TLS1_HB_REQUEST) | |
2760 | { | |
2761 | unsigned char *buffer, *bp; | |
2762 | int r; | |
2763 | ||
2764 | /* Allocate memory for the response, size is 1 bytes | |
2765 | * message type, plus 2 bytes payload length, plus | |
2766 | * payload, plus padding | |
2767 | */ | |
2768 | buffer = OPENSSL_malloc(1 + 2 + payload + padding); | |
2769 | bp = buffer; | |
2770 | ||
2771 | /* Enter response type, length and copy payload */ | |
2772 | *bp++ = TLS1_HB_RESPONSE; | |
2773 | s2n(payload, bp); | |
2774 | memcpy(bp, pl, payload); | |
57cb030c DSH |
2775 | bp += payload; |
2776 | /* Random padding */ | |
2777 | RAND_pseudo_bytes(bp, padding); | |
2778 | ||
4817504d DSH |
2779 | r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding); |
2780 | ||
2781 | if (r >= 0 && s->msg_callback) | |
2782 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
2783 | buffer, 3 + payload + padding, | |
2784 | s, s->msg_callback_arg); | |
2785 | ||
2786 | OPENSSL_free(buffer); | |
2787 | ||
2788 | if (r < 0) | |
2789 | return r; | |
2790 | } | |
2791 | else if (hbtype == TLS1_HB_RESPONSE) | |
2792 | { | |
2793 | unsigned int seq; | |
2794 | ||
2795 | /* We only send sequence numbers (2 bytes unsigned int), | |
2796 | * and 16 random bytes, so we just try to read the | |
2797 | * sequence number */ | |
2798 | n2s(pl, seq); | |
2799 | ||
2800 | if (payload == 18 && seq == s->tlsext_hb_seq) | |
2801 | { | |
2802 | s->tlsext_hb_seq++; | |
2803 | s->tlsext_hb_pending = 0; | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | return 0; | |
2808 | } | |
2809 | ||
2810 | int | |
2811 | tls1_heartbeat(SSL *s) | |
2812 | { | |
2813 | unsigned char *buf, *p; | |
2814 | int ret; | |
2815 | unsigned int payload = 18; /* Sequence number + random bytes */ | |
2816 | unsigned int padding = 16; /* Use minimum padding */ | |
2817 | ||
2818 | /* Only send if peer supports and accepts HB requests... */ | |
2819 | if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) || | |
2820 | s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) | |
2821 | { | |
2822 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT); | |
2823 | return -1; | |
2824 | } | |
2825 | ||
2826 | /* ...and there is none in flight yet... */ | |
2827 | if (s->tlsext_hb_pending) | |
2828 | { | |
2829 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING); | |
2830 | return -1; | |
2831 | } | |
2832 | ||
2833 | /* ...and no handshake in progress. */ | |
2834 | if (SSL_in_init(s) || s->in_handshake) | |
2835 | { | |
2836 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE); | |
2837 | return -1; | |
2838 | } | |
2839 | ||
2840 | /* Check if padding is too long, payload and padding | |
2841 | * must not exceed 2^14 - 3 = 16381 bytes in total. | |
2842 | */ | |
2843 | OPENSSL_assert(payload + padding <= 16381); | |
2844 | ||
2845 | /* Create HeartBeat message, we just use a sequence number | |
2846 | * as payload to distuingish different messages and add | |
2847 | * some random stuff. | |
2848 | * - Message Type, 1 byte | |
2849 | * - Payload Length, 2 bytes (unsigned int) | |
2850 | * - Payload, the sequence number (2 bytes uint) | |
2851 | * - Payload, random bytes (16 bytes uint) | |
2852 | * - Padding | |
2853 | */ | |
2854 | buf = OPENSSL_malloc(1 + 2 + payload + padding); | |
2855 | p = buf; | |
2856 | /* Message Type */ | |
2857 | *p++ = TLS1_HB_REQUEST; | |
2858 | /* Payload length (18 bytes here) */ | |
2859 | s2n(payload, p); | |
2860 | /* Sequence number */ | |
2861 | s2n(s->tlsext_hb_seq, p); | |
2862 | /* 16 random bytes */ | |
2863 | RAND_pseudo_bytes(p, 16); | |
2864 | p += 16; | |
2865 | /* Random padding */ | |
2866 | RAND_pseudo_bytes(p, padding); | |
2867 | ||
2868 | ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding); | |
2869 | if (ret >= 0) | |
2870 | { | |
2871 | if (s->msg_callback) | |
2872 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
2873 | buf, 3 + payload + padding, | |
2874 | s, s->msg_callback_arg); | |
2875 | ||
2876 | s->tlsext_hb_pending = 1; | |
2877 | } | |
2878 | ||
2879 | OPENSSL_free(buf); | |
2880 | ||
2881 | return ret; | |
2882 | } | |
2883 | #endif |