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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); | |
09e4e4b9 DSH |
126 | static int ssl_check_clienthello_tlsext(SSL *s); |
127 | int ssl_check_serverhello_tlsext(SSL *s); | |
367eb1f1 | 128 | #endif |
6434abbf | 129 | |
f3b656b2 | 130 | SSL3_ENC_METHOD TLSv1_enc_data={ |
58964a49 RE |
131 | tls1_enc, |
132 | tls1_mac, | |
133 | tls1_setup_key_block, | |
134 | tls1_generate_master_secret, | |
135 | tls1_change_cipher_state, | |
136 | tls1_final_finish_mac, | |
137 | TLS1_FINISH_MAC_LENGTH, | |
138 | tls1_cert_verify_mac, | |
139 | TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
140 | TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, | |
141 | tls1_alert_code, | |
e0af0405 | 142 | tls1_export_keying_material, |
58964a49 RE |
143 | }; |
144 | ||
f3b656b2 | 145 | long tls1_default_timeout(void) |
58964a49 RE |
146 | { |
147 | /* 2 hours, the 24 hours mentioned in the TLSv1 spec | |
148 | * is way too long for http, the cache would over fill */ | |
149 | return(60*60*2); | |
150 | } | |
151 | ||
6b691a5c | 152 | int tls1_new(SSL *s) |
58964a49 RE |
153 | { |
154 | if (!ssl3_new(s)) return(0); | |
155 | s->method->ssl_clear(s); | |
156 | return(1); | |
157 | } | |
158 | ||
6b691a5c | 159 | void tls1_free(SSL *s) |
58964a49 | 160 | { |
12bf56c0 DSH |
161 | #ifndef OPENSSL_NO_TLSEXT |
162 | if (s->tlsext_session_ticket) | |
163 | { | |
164 | OPENSSL_free(s->tlsext_session_ticket); | |
165 | } | |
166 | #endif /* OPENSSL_NO_TLSEXT */ | |
58964a49 RE |
167 | ssl3_free(s); |
168 | } | |
169 | ||
6b691a5c | 170 | void tls1_clear(SSL *s) |
58964a49 RE |
171 | { |
172 | ssl3_clear(s); | |
637f374a | 173 | s->version = s->method->version; |
58964a49 RE |
174 | } |
175 | ||
525de5d3 | 176 | #ifndef OPENSSL_NO_EC |
eda3766b | 177 | |
525de5d3 DSH |
178 | static int nid_list[] = |
179 | { | |
180 | NID_sect163k1, /* sect163k1 (1) */ | |
181 | NID_sect163r1, /* sect163r1 (2) */ | |
182 | NID_sect163r2, /* sect163r2 (3) */ | |
183 | NID_sect193r1, /* sect193r1 (4) */ | |
184 | NID_sect193r2, /* sect193r2 (5) */ | |
185 | NID_sect233k1, /* sect233k1 (6) */ | |
186 | NID_sect233r1, /* sect233r1 (7) */ | |
187 | NID_sect239k1, /* sect239k1 (8) */ | |
188 | NID_sect283k1, /* sect283k1 (9) */ | |
189 | NID_sect283r1, /* sect283r1 (10) */ | |
190 | NID_sect409k1, /* sect409k1 (11) */ | |
191 | NID_sect409r1, /* sect409r1 (12) */ | |
192 | NID_sect571k1, /* sect571k1 (13) */ | |
193 | NID_sect571r1, /* sect571r1 (14) */ | |
194 | NID_secp160k1, /* secp160k1 (15) */ | |
195 | NID_secp160r1, /* secp160r1 (16) */ | |
196 | NID_secp160r2, /* secp160r2 (17) */ | |
197 | NID_secp192k1, /* secp192k1 (18) */ | |
198 | NID_X9_62_prime192v1, /* secp192r1 (19) */ | |
199 | NID_secp224k1, /* secp224k1 (20) */ | |
200 | NID_secp224r1, /* secp224r1 (21) */ | |
201 | NID_secp256k1, /* secp256k1 (22) */ | |
202 | NID_X9_62_prime256v1, /* secp256r1 (23) */ | |
203 | NID_secp384r1, /* secp384r1 (24) */ | |
204 | NID_secp521r1 /* secp521r1 (25) */ | |
205 | }; | |
eda3766b | 206 | |
d0595f17 DSH |
207 | |
208 | static const unsigned char ecformats_default[] = | |
eda3766b | 209 | { |
d0595f17 DSH |
210 | TLSEXT_ECPOINTFORMAT_uncompressed, |
211 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime, | |
212 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 | |
213 | }; | |
214 | ||
215 | static const unsigned char eccurves_default[] = | |
216 | { | |
217 | 0,14, /* sect571r1 (14) */ | |
218 | 0,13, /* sect571k1 (13) */ | |
219 | 0,25, /* secp521r1 (25) */ | |
220 | 0,11, /* sect409k1 (11) */ | |
221 | 0,12, /* sect409r1 (12) */ | |
222 | 0,24, /* secp384r1 (24) */ | |
223 | 0,9, /* sect283k1 (9) */ | |
224 | 0,10, /* sect283r1 (10) */ | |
225 | 0,22, /* secp256k1 (22) */ | |
226 | 0,23, /* secp256r1 (23) */ | |
227 | 0,8, /* sect239k1 (8) */ | |
228 | 0,6, /* sect233k1 (6) */ | |
229 | 0,7, /* sect233r1 (7) */ | |
230 | 0,20, /* secp224k1 (20) */ | |
231 | 0,21, /* secp224r1 (21) */ | |
232 | 0,4, /* sect193r1 (4) */ | |
233 | 0,5, /* sect193r2 (5) */ | |
234 | 0,18, /* secp192k1 (18) */ | |
235 | 0,19, /* secp192r1 (19) */ | |
236 | 0,1, /* sect163k1 (1) */ | |
237 | 0,2, /* sect163r1 (2) */ | |
238 | 0,3, /* sect163r2 (3) */ | |
239 | 0,15, /* secp160k1 (15) */ | |
240 | 0,16, /* secp160r1 (16) */ | |
241 | 0,17, /* secp160r2 (17) */ | |
eda3766b DSH |
242 | }; |
243 | ||
525de5d3 DSH |
244 | int tls1_ec_curve_id2nid(int curve_id) |
245 | { | |
246 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
1e26a8ba GT |
247 | if ((curve_id < 1) || ((unsigned int)curve_id > |
248 | sizeof(nid_list)/sizeof(nid_list[0]))) | |
249 | return 0; | |
525de5d3 DSH |
250 | return nid_list[curve_id-1]; |
251 | } | |
252 | ||
253 | int tls1_ec_nid2curve_id(int nid) | |
254 | { | |
255 | /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ | |
256 | switch (nid) | |
257 | { | |
258 | case NID_sect163k1: /* sect163k1 (1) */ | |
259 | return 1; | |
260 | case NID_sect163r1: /* sect163r1 (2) */ | |
261 | return 2; | |
262 | case NID_sect163r2: /* sect163r2 (3) */ | |
263 | return 3; | |
264 | case NID_sect193r1: /* sect193r1 (4) */ | |
265 | return 4; | |
266 | case NID_sect193r2: /* sect193r2 (5) */ | |
267 | return 5; | |
268 | case NID_sect233k1: /* sect233k1 (6) */ | |
269 | return 6; | |
270 | case NID_sect233r1: /* sect233r1 (7) */ | |
271 | return 7; | |
272 | case NID_sect239k1: /* sect239k1 (8) */ | |
273 | return 8; | |
274 | case NID_sect283k1: /* sect283k1 (9) */ | |
275 | return 9; | |
276 | case NID_sect283r1: /* sect283r1 (10) */ | |
277 | return 10; | |
278 | case NID_sect409k1: /* sect409k1 (11) */ | |
279 | return 11; | |
280 | case NID_sect409r1: /* sect409r1 (12) */ | |
281 | return 12; | |
282 | case NID_sect571k1: /* sect571k1 (13) */ | |
283 | return 13; | |
284 | case NID_sect571r1: /* sect571r1 (14) */ | |
285 | return 14; | |
286 | case NID_secp160k1: /* secp160k1 (15) */ | |
287 | return 15; | |
288 | case NID_secp160r1: /* secp160r1 (16) */ | |
289 | return 16; | |
290 | case NID_secp160r2: /* secp160r2 (17) */ | |
291 | return 17; | |
292 | case NID_secp192k1: /* secp192k1 (18) */ | |
293 | return 18; | |
294 | case NID_X9_62_prime192v1: /* secp192r1 (19) */ | |
295 | return 19; | |
296 | case NID_secp224k1: /* secp224k1 (20) */ | |
297 | return 20; | |
298 | case NID_secp224r1: /* secp224r1 (21) */ | |
299 | return 21; | |
300 | case NID_secp256k1: /* secp256k1 (22) */ | |
301 | return 22; | |
302 | case NID_X9_62_prime256v1: /* secp256r1 (23) */ | |
303 | return 23; | |
304 | case NID_secp384r1: /* secp384r1 (24) */ | |
305 | return 24; | |
306 | case NID_secp521r1: /* secp521r1 (25) */ | |
307 | return 25; | |
308 | default: | |
309 | return 0; | |
310 | } | |
311 | } | |
fd2b65ce DSH |
312 | /* Get curves list, if "sess" is set return client curves otherwise |
313 | * preferred list | |
314 | */ | |
315 | static void tls1_get_curvelist(SSL *s, int sess, | |
316 | const unsigned char **pcurves, | |
317 | size_t *pcurveslen) | |
318 | { | |
319 | if (sess) | |
320 | { | |
321 | *pcurves = s->session->tlsext_ellipticcurvelist; | |
322 | *pcurveslen = s->session->tlsext_ellipticcurvelist_length; | |
323 | } | |
324 | else | |
325 | { | |
326 | *pcurves = s->tlsext_ellipticcurvelist; | |
327 | *pcurveslen = s->tlsext_ellipticcurvelist_length; | |
328 | } | |
329 | /* If not set use default: for now static structure */ | |
330 | if (!*pcurves) | |
331 | { | |
332 | *pcurves = eccurves_default; | |
333 | *pcurveslen = sizeof(eccurves_default); | |
334 | } | |
335 | } | |
d0595f17 | 336 | |
a4352630 DSH |
337 | /* Return nth shared curve. If nmatch == -1 return number of |
338 | * matches. | |
d0595f17 | 339 | */ |
a4352630 DSH |
340 | |
341 | int tls1_shared_curve(SSL *s, int nmatch) | |
d0595f17 DSH |
342 | { |
343 | const unsigned char *pref, *supp; | |
344 | size_t preflen, supplen, i, j; | |
345 | int k; | |
a4352630 DSH |
346 | /* Can't do anything on client side */ |
347 | if (s->server == 0) | |
348 | return -1; | |
349 | tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), | |
350 | &supp, &supplen); | |
351 | tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), | |
352 | &pref, &preflen); | |
353 | preflen /= 2; | |
354 | supplen /= 2; | |
d0595f17 DSH |
355 | k = 0; |
356 | for (i = 0; i < preflen; i++, pref+=2) | |
357 | { | |
358 | const unsigned char *tsupp = supp; | |
359 | for (j = 0; j < supplen; j++, tsupp+=2) | |
360 | { | |
361 | if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) | |
362 | { | |
363 | if (nmatch == k) | |
a4352630 DSH |
364 | { |
365 | int id = (pref[0] << 8) | pref[1]; | |
366 | return tls1_ec_curve_id2nid(id); | |
367 | } | |
d0595f17 DSH |
368 | k++; |
369 | } | |
370 | } | |
371 | } | |
d0595f17 | 372 | if (nmatch == -1) |
a4352630 DSH |
373 | return k; |
374 | return 0; | |
d0595f17 DSH |
375 | } |
376 | ||
377 | int tls1_set_curves(unsigned char **pext, size_t *pextlen, | |
378 | int *curves, size_t ncurves) | |
379 | { | |
380 | unsigned char *clist, *p; | |
381 | size_t i; | |
382 | /* Bitmap of curves included to detect duplicates: only works | |
383 | * while curve ids < 32 | |
384 | */ | |
385 | unsigned long dup_list = 0; | |
386 | clist = OPENSSL_malloc(ncurves * 2); | |
387 | if (!clist) | |
388 | return 0; | |
389 | for (i = 0, p = clist; i < ncurves; i++) | |
390 | { | |
391 | unsigned long idmask; | |
392 | int id; | |
393 | id = tls1_ec_nid2curve_id(curves[i]); | |
394 | idmask = 1L << id; | |
395 | if (!id || (dup_list & idmask)) | |
396 | { | |
397 | OPENSSL_free(clist); | |
398 | return 0; | |
399 | } | |
400 | dup_list |= idmask; | |
401 | s2n(id, p); | |
402 | } | |
403 | if (*pext) | |
404 | OPENSSL_free(*pext); | |
405 | *pext = clist; | |
406 | *pextlen = ncurves * 2; | |
407 | return 1; | |
408 | } | |
409 | ||
410 | #define MAX_CURVELIST 25 | |
411 | ||
412 | typedef struct | |
413 | { | |
414 | size_t nidcnt; | |
415 | int nid_arr[MAX_CURVELIST]; | |
416 | } nid_cb_st; | |
417 | ||
418 | static int nid_cb(const char *elem, int len, void *arg) | |
419 | { | |
420 | nid_cb_st *narg = arg; | |
421 | size_t i; | |
422 | int nid; | |
423 | char etmp[20]; | |
424 | if (narg->nidcnt == MAX_CURVELIST) | |
425 | return 0; | |
426 | if (len > (int)(sizeof(etmp) - 1)) | |
427 | return 0; | |
428 | memcpy(etmp, elem, len); | |
429 | etmp[len] = 0; | |
430 | nid = EC_curve_nist2nid(etmp); | |
431 | if (nid == NID_undef) | |
432 | nid = OBJ_sn2nid(etmp); | |
433 | if (nid == NID_undef) | |
434 | nid = OBJ_ln2nid(etmp); | |
435 | if (nid == NID_undef) | |
436 | return 0; | |
437 | for (i = 0; i < narg->nidcnt; i++) | |
438 | if (narg->nid_arr[i] == nid) | |
439 | return 0; | |
440 | narg->nid_arr[narg->nidcnt++] = nid; | |
441 | return 1; | |
442 | } | |
443 | /* Set curves based on a colon separate list */ | |
444 | int tls1_set_curves_list(unsigned char **pext, size_t *pextlen, | |
445 | const char *str) | |
446 | { | |
447 | nid_cb_st ncb; | |
448 | ncb.nidcnt = 0; | |
449 | if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb)) | |
450 | return 0; | |
451 | return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt); | |
452 | } | |
fd2b65ce DSH |
453 | /* For an EC key set TLS id and required compression based on parameters */ |
454 | static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id, | |
455 | EC_KEY *ec) | |
456 | { | |
457 | int is_prime, id; | |
458 | const EC_GROUP *grp; | |
459 | const EC_POINT *pt; | |
460 | const EC_METHOD *meth; | |
461 | if (!ec) | |
462 | return 0; | |
463 | /* Determine if it is a prime field */ | |
464 | grp = EC_KEY_get0_group(ec); | |
465 | pt = EC_KEY_get0_public_key(ec); | |
466 | if (!grp || !pt) | |
467 | return 0; | |
468 | meth = EC_GROUP_method_of(grp); | |
469 | if (!meth) | |
470 | return 0; | |
471 | if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field) | |
472 | is_prime = 1; | |
473 | else | |
474 | is_prime = 0; | |
475 | /* Determine curve ID */ | |
476 | id = EC_GROUP_get_curve_name(grp); | |
477 | id = tls1_ec_nid2curve_id(id); | |
478 | /* If we have an ID set it, otherwise set arbitrary explicit curve */ | |
479 | if (id) | |
480 | { | |
481 | curve_id[0] = 0; | |
482 | curve_id[1] = (unsigned char)id; | |
483 | } | |
484 | else | |
485 | { | |
486 | curve_id[0] = 0xff; | |
487 | if (is_prime) | |
488 | curve_id[1] = 0x01; | |
489 | else | |
490 | curve_id[1] = 0x02; | |
491 | } | |
492 | if (comp_id) | |
493 | { | |
494 | if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) | |
495 | { | |
496 | if (is_prime) | |
497 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
498 | else | |
499 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
500 | } | |
501 | else | |
502 | *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed; | |
503 | } | |
504 | return 1; | |
505 | } | |
506 | /* Check an EC key is compatible with extensions */ | |
507 | static int tls1_check_ec_key(SSL *s, | |
508 | unsigned char *curve_id, unsigned char *comp_id) | |
509 | { | |
510 | const unsigned char *p; | |
511 | size_t plen, i; | |
a4352630 | 512 | int j; |
fd2b65ce DSH |
513 | /* If point formats extension present check it, otherwise everything |
514 | * is supported (see RFC4492). | |
515 | */ | |
516 | if (comp_id && s->session->tlsext_ecpointformatlist) | |
517 | { | |
518 | p = s->session->tlsext_ecpointformatlist; | |
519 | plen = s->session->tlsext_ecpointformatlist_length; | |
520 | for (i = 0; i < plen; i++, p++) | |
521 | { | |
522 | if (*comp_id == *p) | |
523 | break; | |
524 | } | |
525 | if (i == plen) | |
526 | return 0; | |
527 | } | |
a4352630 DSH |
528 | /* Check curve is consistent with client and server preferences */ |
529 | for (j = 0; j <= 1; j++) | |
fd2b65ce | 530 | { |
a4352630 | 531 | tls1_get_curvelist(s, j, &p, &plen); |
fd2b65ce DSH |
532 | for (i = 0; i < plen; i+=2, p+=2) |
533 | { | |
534 | if (p[0] == curve_id[0] && p[1] == curve_id[1]) | |
a4352630 | 535 | break; |
fd2b65ce | 536 | } |
a4352630 DSH |
537 | if (i == plen) |
538 | return 0; | |
fd2b65ce DSH |
539 | } |
540 | return 1; | |
541 | } | |
d61ff83b DSH |
542 | |
543 | /* Check cert parameters compatible with extensions: currently just checks | |
544 | * EC certificates have compatible curves and compression. | |
545 | */ | |
546 | static int tls1_check_cert_param(SSL *s, X509 *x) | |
fd2b65ce | 547 | { |
fd2b65ce | 548 | unsigned char comp_id, curve_id[2]; |
d61ff83b DSH |
549 | EVP_PKEY *pkey; |
550 | int rv; | |
551 | pkey = X509_get_pubkey(x); | |
fd2b65ce DSH |
552 | if (!pkey) |
553 | return 0; | |
d61ff83b DSH |
554 | /* If not EC nothing to do */ |
555 | if (pkey->type != EVP_PKEY_EC) | |
556 | { | |
557 | EVP_PKEY_free(pkey); | |
558 | return 1; | |
559 | } | |
fd2b65ce DSH |
560 | rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec); |
561 | EVP_PKEY_free(pkey); | |
562 | if (!rv) | |
563 | return 0; | |
564 | return tls1_check_ec_key(s, curve_id, &comp_id); | |
565 | } | |
566 | /* Check EC temporary key is compatible with client extensions */ | |
567 | int tls1_check_ec_tmp_key(SSL *s) | |
568 | { | |
569 | unsigned char curve_id[2]; | |
570 | EC_KEY *ec = s->cert->ecdh_tmp; | |
a4352630 DSH |
571 | if (s->cert->ecdh_tmp_auto) |
572 | { | |
573 | /* Need a shared curve */ | |
574 | if (tls1_shared_curve(s, 0)) | |
575 | return 1; | |
576 | else return 0; | |
577 | } | |
fd2b65ce DSH |
578 | if (!ec) |
579 | { | |
580 | if (s->cert->ecdh_tmp_cb) | |
581 | return 1; | |
582 | else | |
583 | return 0; | |
584 | } | |
585 | if (!tls1_set_ec_id(curve_id, NULL, ec)) | |
586 | return 1; | |
587 | return tls1_check_ec_key(s, curve_id, NULL); | |
588 | } | |
d0595f17 | 589 | |
525de5d3 | 590 | #endif /* OPENSSL_NO_EC */ |
f1fd4544 | 591 | |
ed3883d2 | 592 | #ifndef OPENSSL_NO_TLSEXT |
fc101f88 DSH |
593 | |
594 | /* List of supported signature algorithms and hashes. Should make this | |
595 | * customisable at some point, for now include everything we support. | |
596 | */ | |
597 | ||
598 | #ifdef OPENSSL_NO_RSA | |
599 | #define tlsext_sigalg_rsa(md) /* */ | |
600 | #else | |
601 | #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa, | |
602 | #endif | |
603 | ||
604 | #ifdef OPENSSL_NO_DSA | |
605 | #define tlsext_sigalg_dsa(md) /* */ | |
606 | #else | |
607 | #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa, | |
608 | #endif | |
609 | ||
610 | #ifdef OPENSSL_NO_ECDSA | |
611 | #define tlsext_sigalg_ecdsa(md) /* */ | |
612 | #else | |
654ac273 | 613 | #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa, |
fc101f88 DSH |
614 | #endif |
615 | ||
616 | #define tlsext_sigalg(md) \ | |
617 | tlsext_sigalg_rsa(md) \ | |
618 | tlsext_sigalg_dsa(md) \ | |
619 | tlsext_sigalg_ecdsa(md) | |
620 | ||
621 | static unsigned char tls12_sigalgs[] = { | |
622 | #ifndef OPENSSL_NO_SHA512 | |
623 | tlsext_sigalg(TLSEXT_hash_sha512) | |
624 | tlsext_sigalg(TLSEXT_hash_sha384) | |
625 | #endif | |
626 | #ifndef OPENSSL_NO_SHA256 | |
627 | tlsext_sigalg(TLSEXT_hash_sha256) | |
628 | tlsext_sigalg(TLSEXT_hash_sha224) | |
629 | #endif | |
630 | #ifndef OPENSSL_NO_SHA | |
631 | tlsext_sigalg(TLSEXT_hash_sha1) | |
632 | #endif | |
633 | #ifndef OPENSSL_NO_MD5 | |
634 | tlsext_sigalg_rsa(TLSEXT_hash_md5) | |
635 | #endif | |
636 | }; | |
637 | ||
b7bfe69b | 638 | size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs) |
f37f20ff | 639 | { |
3dbc46df DSH |
640 | /* If server use client authentication sigalgs if not NULL */ |
641 | if (s->server && s->cert->client_sigalgs) | |
642 | { | |
b7bfe69b DSH |
643 | *psigs = s->cert->client_sigalgs; |
644 | return s->cert->client_sigalgslen; | |
3dbc46df DSH |
645 | } |
646 | else if (s->cert->conf_sigalgs) | |
647 | { | |
b7bfe69b DSH |
648 | *psigs = s->cert->conf_sigalgs; |
649 | return s->cert->conf_sigalgslen; | |
3dbc46df | 650 | } |
4453cd8c | 651 | else |
0f229cce | 652 | { |
b7bfe69b | 653 | *psigs = tls12_sigalgs; |
ebc5e72f | 654 | #ifdef OPENSSL_FIPS |
4453cd8c DSH |
655 | /* If FIPS mode don't include MD5 which is last */ |
656 | if (FIPS_mode()) | |
b7bfe69b DSH |
657 | return sizeof(tls12_sigalgs) - 2; |
658 | else | |
ebc5e72f | 659 | #endif |
b7bfe69b | 660 | return sizeof(tls12_sigalgs); |
4453cd8c | 661 | } |
b7bfe69b DSH |
662 | } |
663 | /* Get a mask of disabled algorithms: an algorithm is disabled | |
664 | * if it isn't supported or doesn't appear in supported signature | |
665 | * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific | |
666 | * session and not global settings. | |
667 | * | |
668 | */ | |
669 | void ssl_set_client_disabled(SSL *s) | |
670 | { | |
671 | CERT *c = s->cert; | |
672 | const unsigned char *sigalgs; | |
673 | size_t i, sigalgslen; | |
674 | int have_rsa = 0, have_dsa = 0, have_ecdsa = 0; | |
675 | c->mask_a = 0; | |
676 | c->mask_k = 0; | |
677 | /* If less than TLS 1.2 don't allow TLS 1.2 only ciphers */ | |
678 | if (TLS1_get_version(s) < TLS1_2_VERSION) | |
679 | c->mask_ssl = SSL_TLSV1_2; | |
680 | else | |
681 | c->mask_ssl = 0; | |
682 | /* Now go through all signature algorithms seeing if we support | |
683 | * any for RSA, DSA, ECDSA. Do this for all versions not just | |
684 | * TLS 1.2. | |
685 | */ | |
686 | sigalgslen = tls12_get_psigalgs(s, &sigalgs); | |
687 | for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) | |
688 | { | |
689 | switch(sigalgs[1]) | |
690 | { | |
691 | #ifndef OPENSSL_NO_RSA | |
692 | case TLSEXT_signature_rsa: | |
693 | have_rsa = 1; | |
694 | break; | |
695 | #endif | |
696 | #ifndef OPENSSL_NO_DSA | |
697 | case TLSEXT_signature_dsa: | |
698 | have_dsa = 1; | |
699 | break; | |
700 | #endif | |
701 | #ifndef OPENSSL_NO_ECDSA | |
702 | case TLSEXT_signature_ecdsa: | |
703 | have_ecdsa = 1; | |
704 | break; | |
705 | #endif | |
706 | } | |
707 | } | |
708 | /* Disable auth and static DH if we don't include any appropriate | |
709 | * signature algorithms. | |
710 | */ | |
711 | if (!have_rsa) | |
712 | { | |
713 | c->mask_a |= SSL_aRSA; | |
714 | c->mask_k |= SSL_kDHr|SSL_kECDHr; | |
715 | } | |
716 | if (!have_dsa) | |
717 | { | |
718 | c->mask_a |= SSL_aDSS; | |
719 | c->mask_k |= SSL_kDHd; | |
720 | } | |
721 | if (!have_ecdsa) | |
722 | { | |
723 | c->mask_a |= SSL_aECDSA; | |
724 | c->mask_k |= SSL_kECDHe; | |
725 | } | |
726 | #ifndef OPENSSL_NO_KRB5 | |
727 | if (!kssl_tgt_is_available(s->kssl_ctx)) | |
728 | { | |
729 | c->mask_a |= SSL_aKRB5; | |
730 | c->mask_k |= SSL_kKRB5; | |
731 | } | |
732 | #endif | |
733 | #ifndef OPENSSL_NO_PSK | |
734 | /* with PSK there must be client callback set */ | |
735 | if (!s->psk_client_callback) | |
736 | { | |
737 | c->mask_a |= SSL_aPSK; | |
738 | c->mask_k |= SSL_kPSK; | |
739 | } | |
740 | #endif /* OPENSSL_NO_PSK */ | |
741 | c->valid = 1; | |
f37f20ff | 742 | } |
fc101f88 | 743 | |
a9e1c50b BL |
744 | /* byte_compare is a compare function for qsort(3) that compares bytes. */ |
745 | static int byte_compare(const void *in_a, const void *in_b) | |
746 | { | |
747 | unsigned char a = *((const unsigned char*) in_a); | |
748 | unsigned char b = *((const unsigned char*) in_b); | |
749 | ||
750 | if (a > b) | |
751 | return 1; | |
752 | else if (a < b) | |
753 | return -1; | |
754 | return 0; | |
755 | } | |
756 | ||
f1fd4544 BM |
757 | unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
758 | { | |
ed3883d2 BM |
759 | int extdatalen=0; |
760 | unsigned char *ret = p; | |
d0595f17 DSH |
761 | #ifndef OPENSSL_NO_EC |
762 | /* See if we support any ECC ciphersuites */ | |
763 | int using_ecc = 0; | |
764 | if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION) | |
765 | { | |
766 | int i; | |
767 | unsigned long alg_k, alg_a; | |
768 | STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); | |
769 | ||
770 | for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) | |
771 | { | |
772 | SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); | |
773 | ||
774 | alg_k = c->algorithm_mkey; | |
775 | alg_a = c->algorithm_auth; | |
776 | if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) | |
777 | || (alg_a & SSL_aECDSA))) | |
778 | { | |
779 | using_ecc = 1; | |
780 | break; | |
781 | } | |
782 | } | |
783 | } | |
784 | #endif | |
ed3883d2 | 785 | |
13f6d57b DSH |
786 | /* don't add extensions for SSLv3 unless doing secure renegotiation */ |
787 | if (s->client_version == SSL3_VERSION | |
788 | && !s->s3->send_connection_binding) | |
5f8f94a6 DSH |
789 | return p; |
790 | ||
ed3883d2 BM |
791 | ret+=2; |
792 | ||
793 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ | |
6434abbf | 794 | |
a70183bc | 795 | if (s->tlsext_hostname != NULL) |
f1fd4544 | 796 | { |
ed3883d2 BM |
797 | /* Add TLS extension servername to the Client Hello message */ |
798 | unsigned long size_str; | |
799 | long lenmax; | |
800 | ||
a70183bc | 801 | /* check for enough space. |
52b8dad8 BM |
802 | 4 for the servername type and entension length |
803 | 2 for servernamelist length | |
804 | 1 for the hostname type | |
805 | 2 for hostname length | |
806 | + hostname length | |
a70183bc | 807 | */ |
52b8dad8 | 808 | |
761772d7 BM |
809 | if ((lenmax = limit - ret - 9) < 0 |
810 | || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) | |
a70183bc BM |
811 | return NULL; |
812 | ||
813 | /* extension type and length */ | |
814 | s2n(TLSEXT_TYPE_server_name,ret); | |
815 | s2n(size_str+5,ret); | |
f1fd4544 | 816 | |
a70183bc | 817 | /* length of servername list */ |
ed3883d2 | 818 | s2n(size_str+3,ret); |
a70183bc BM |
819 | |
820 | /* hostname type, length and hostname */ | |
f1fd4544 | 821 | *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; |
ed3883d2 | 822 | s2n(size_str,ret); |
ed3883d2 BM |
823 | memcpy(ret, s->tlsext_hostname, size_str); |
824 | ret+=size_str; | |
f1fd4544 | 825 | } |
761772d7 | 826 | |
423c66f1 | 827 | /* Add RI if renegotiating */ |
bdd53508 | 828 | if (s->renegotiate) |
423c66f1 | 829 | { |
860c3dd1 DSH |
830 | int el; |
831 | ||
832 | if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) | |
833 | { | |
834 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
835 | return NULL; | |
836 | } | |
837 | ||
838 | if((limit - p - 4 - el) < 0) return NULL; | |
839 | ||
840 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
841 | s2n(el,ret); | |
842 | ||
843 | if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) | |
844 | { | |
845 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
846 | return NULL; | |
847 | } | |
848 | ||
849 | ret += el; | |
850 | } | |
851 | ||
edc032b5 | 852 | #ifndef OPENSSL_NO_SRP |
1df80b65 | 853 | /* Add SRP username if there is one */ |
edc032b5 | 854 | if (s->srp_ctx.login != NULL) |
1df80b65 | 855 | { /* Add TLS extension SRP username to the Client Hello message */ |
edc032b5 | 856 | |
1df80b65 DSH |
857 | int login_len = strlen(s->srp_ctx.login); |
858 | if (login_len > 255 || login_len == 0) | |
edc032b5 BL |
859 | { |
860 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
861 | return NULL; | |
1df80b65 DSH |
862 | } |
863 | ||
864 | /* check for enough space. | |
865 | 4 for the srp type type and entension length | |
866 | 1 for the srp user identity | |
867 | + srp user identity length | |
868 | */ | |
869 | if ((limit - ret - 5 - login_len) < 0) return NULL; | |
870 | ||
871 | /* fill in the extension */ | |
edc032b5 BL |
872 | s2n(TLSEXT_TYPE_srp,ret); |
873 | s2n(login_len+1,ret); | |
1df80b65 DSH |
874 | (*ret++) = (unsigned char) login_len; |
875 | memcpy(ret, s->srp_ctx.login, login_len); | |
edc032b5 BL |
876 | ret+=login_len; |
877 | } | |
878 | #endif | |
879 | ||
36ca4ba6 | 880 | #ifndef OPENSSL_NO_EC |
d0595f17 | 881 | if (using_ecc) |
36ca4ba6 BM |
882 | { |
883 | /* Add TLS extension ECPointFormats to the ClientHello message */ | |
884 | long lenmax; | |
d0595f17 DSH |
885 | const unsigned char *plist; |
886 | size_t plistlen; | |
887 | /* If we have a custom point format list use it otherwise | |
888 | * use default */ | |
889 | plist = s->tlsext_ecpointformatlist; | |
890 | if (plist) | |
891 | plistlen = s->tlsext_ecpointformatlist_length; | |
892 | else | |
893 | { | |
894 | plist = ecformats_default; | |
895 | plistlen = sizeof(ecformats_default); | |
896 | } | |
36ca4ba6 | 897 | |
761772d7 | 898 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
d0595f17 DSH |
899 | if (plistlen > (size_t)lenmax) return NULL; |
900 | if (plistlen > 255) | |
019fdc78 BM |
901 | { |
902 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
903 | return NULL; | |
904 | } | |
36ca4ba6 BM |
905 | |
906 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
d0595f17 DSH |
907 | s2n(plistlen + 1,ret); |
908 | *(ret++) = (unsigned char)plistlen ; | |
909 | memcpy(ret, plist, plistlen); | |
910 | ret+=plistlen; | |
911 | ||
33273721 | 912 | /* Add TLS extension EllipticCurves to the ClientHello message */ |
d0595f17 | 913 | plist = s->tlsext_ellipticcurvelist; |
fd2b65ce | 914 | tls1_get_curvelist(s, 0, &plist, &plistlen); |
33273721 | 915 | |
761772d7 | 916 | if ((lenmax = limit - ret - 6) < 0) return NULL; |
d0595f17 DSH |
917 | if (plistlen > (size_t)lenmax) return NULL; |
918 | if (plistlen > 65532) | |
33273721 BM |
919 | { |
920 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
921 | return NULL; | |
922 | } | |
923 | ||
924 | s2n(TLSEXT_TYPE_elliptic_curves,ret); | |
d0595f17 | 925 | s2n(plistlen + 2, ret); |
a4974de9 BM |
926 | |
927 | /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for | |
928 | * elliptic_curve_list, but the examples use two bytes. | |
929 | * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html | |
930 | * resolves this to two bytes. | |
931 | */ | |
d0595f17 DSH |
932 | s2n(plistlen, ret); |
933 | memcpy(ret, plist, plistlen); | |
934 | ret+=plistlen; | |
33273721 | 935 | } |
36ca4ba6 | 936 | #endif /* OPENSSL_NO_EC */ |
d3442bc7 | 937 | |
6434abbf DSH |
938 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) |
939 | { | |
940 | int ticklen; | |
7ba3838a | 941 | if (!s->new_session && s->session && s->session->tlsext_tick) |
6434abbf | 942 | ticklen = s->session->tlsext_ticklen; |
12bf56c0 DSH |
943 | else if (s->session && s->tlsext_session_ticket && |
944 | s->tlsext_session_ticket->data) | |
945 | { | |
946 | ticklen = s->tlsext_session_ticket->length; | |
947 | s->session->tlsext_tick = OPENSSL_malloc(ticklen); | |
948 | if (!s->session->tlsext_tick) | |
949 | return NULL; | |
950 | memcpy(s->session->tlsext_tick, | |
951 | s->tlsext_session_ticket->data, | |
952 | ticklen); | |
953 | s->session->tlsext_ticklen = ticklen; | |
954 | } | |
6434abbf DSH |
955 | else |
956 | ticklen = 0; | |
12bf56c0 DSH |
957 | if (ticklen == 0 && s->tlsext_session_ticket && |
958 | s->tlsext_session_ticket->data == NULL) | |
959 | goto skip_ext; | |
6434abbf DSH |
960 | /* Check for enough room 2 for extension type, 2 for len |
961 | * rest for ticket | |
962 | */ | |
761772d7 | 963 | if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; |
6434abbf DSH |
964 | s2n(TLSEXT_TYPE_session_ticket,ret); |
965 | s2n(ticklen,ret); | |
966 | if (ticklen) | |
967 | { | |
968 | memcpy(ret, s->session->tlsext_tick, ticklen); | |
969 | ret += ticklen; | |
970 | } | |
971 | } | |
12bf56c0 | 972 | skip_ext: |
6434abbf | 973 | |
7744ef1a | 974 | if (TLS1_get_client_version(s) >= TLS1_2_VERSION) |
a2f9200f | 975 | { |
0f229cce | 976 | size_t salglen; |
b7bfe69b DSH |
977 | const unsigned char *salg; |
978 | salglen = tls12_get_psigalgs(s, &salg); | |
0f229cce | 979 | if ((size_t)(limit - ret) < salglen + 6) |
a2f9200f DSH |
980 | return NULL; |
981 | s2n(TLSEXT_TYPE_signature_algorithms,ret); | |
0f229cce DSH |
982 | s2n(salglen + 2, ret); |
983 | s2n(salglen, ret); | |
b7bfe69b | 984 | memcpy(ret, salg, salglen); |
0f229cce | 985 | ret += salglen; |
a2f9200f DSH |
986 | } |
987 | ||
761772d7 | 988 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
989 | if (s->s3->client_opaque_prf_input != NULL && |
990 | s->version != DTLS1_VERSION) | |
761772d7 BM |
991 | { |
992 | size_t col = s->s3->client_opaque_prf_input_len; | |
993 | ||
994 | if ((long)(limit - ret - 6 - col < 0)) | |
995 | return NULL; | |
996 | if (col > 0xFFFD) /* can't happen */ | |
997 | return NULL; | |
998 | ||
999 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
1000 | s2n(col + 2, ret); | |
1001 | s2n(col, ret); | |
1002 | memcpy(ret, s->s3->client_opaque_prf_input, col); | |
1003 | ret += col; | |
1004 | } | |
1005 | #endif | |
1006 | ||
8025e251 DSH |
1007 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && |
1008 | s->version != DTLS1_VERSION) | |
67c8e7f4 DSH |
1009 | { |
1010 | int i; | |
1011 | long extlen, idlen, itmp; | |
1012 | OCSP_RESPID *id; | |
1013 | ||
1014 | idlen = 0; | |
1015 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
1016 | { | |
1017 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
1018 | itmp = i2d_OCSP_RESPID(id, NULL); | |
1019 | if (itmp <= 0) | |
1020 | return NULL; | |
1021 | idlen += itmp + 2; | |
1022 | } | |
1023 | ||
1024 | if (s->tlsext_ocsp_exts) | |
1025 | { | |
1026 | extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); | |
1027 | if (extlen < 0) | |
1028 | return NULL; | |
1029 | } | |
1030 | else | |
1031 | extlen = 0; | |
1032 | ||
1033 | if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; | |
1034 | s2n(TLSEXT_TYPE_status_request, ret); | |
1035 | if (extlen + idlen > 0xFFF0) | |
1036 | return NULL; | |
1037 | s2n(extlen + idlen + 5, ret); | |
1038 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
1039 | s2n(idlen, ret); | |
1040 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) | |
1041 | { | |
1042 | /* save position of id len */ | |
1043 | unsigned char *q = ret; | |
1044 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
1045 | /* skip over id len */ | |
1046 | ret += 2; | |
1047 | itmp = i2d_OCSP_RESPID(id, &ret); | |
1048 | /* write id len */ | |
1049 | s2n(itmp, q); | |
1050 | } | |
1051 | s2n(extlen, ret); | |
1052 | if (extlen > 0) | |
1053 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
1054 | } | |
1055 | ||
4817504d DSH |
1056 | #ifndef OPENSSL_NO_HEARTBEATS |
1057 | /* Add Heartbeat extension */ | |
1058 | s2n(TLSEXT_TYPE_heartbeat,ret); | |
1059 | s2n(1,ret); | |
1060 | /* Set mode: | |
1061 | * 1: peer may send requests | |
1062 | * 2: peer not allowed to send requests | |
1063 | */ | |
1064 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) | |
1065 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1066 | else | |
1067 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
1068 | #endif | |
1069 | ||
bf48836c | 1070 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1071 | if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) |
1072 | { | |
1073 | /* The client advertises an emtpy extension to indicate its | |
1074 | * support for Next Protocol Negotiation */ | |
1075 | if (limit - ret - 4 < 0) | |
1076 | return NULL; | |
1077 | s2n(TLSEXT_TYPE_next_proto_neg,ret); | |
1078 | s2n(0,ret); | |
1079 | } | |
1080 | #endif | |
1081 | ||
333f926d BL |
1082 | if(SSL_get_srtp_profiles(s)) |
1083 | { | |
1084 | int el; | |
1085 | ||
1086 | ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0); | |
1087 | ||
1088 | if((limit - p - 4 - el) < 0) return NULL; | |
1089 | ||
1090 | s2n(TLSEXT_TYPE_use_srtp,ret); | |
1091 | s2n(el,ret); | |
1092 | ||
1093 | if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) | |
1094 | { | |
1095 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1096 | return NULL; | |
1097 | } | |
1098 | ret += el; | |
1099 | } | |
1100 | ||
a9e1c50b BL |
1101 | /* Add TLS extension Server_Authz_DataFormats to the ClientHello */ |
1102 | /* 2 bytes for extension type */ | |
1103 | /* 2 bytes for extension length */ | |
1104 | /* 1 byte for the list length */ | |
1105 | /* 1 byte for the list (we only support audit proofs) */ | |
1106 | if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL) | |
1107 | { | |
1108 | size_t lenmax; | |
1109 | const unsigned short ext_len = 2; | |
1110 | const unsigned char list_len = 1; | |
1111 | ||
1112 | if ((lenmax = limit - ret - 6) < 0) return NULL; | |
1113 | ||
1114 | s2n(TLSEXT_TYPE_server_authz, ret); | |
1115 | /* Extension length: 2 bytes */ | |
1116 | s2n(ext_len, ret); | |
1117 | *(ret++) = list_len; | |
1118 | *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof; | |
1119 | } | |
1120 | ||
1121 | if ((extdatalen = ret-p-2) == 0) | |
ed3883d2 BM |
1122 | return p; |
1123 | ||
1124 | s2n(extdatalen,p); | |
1125 | return ret; | |
52b8dad8 | 1126 | } |
ed3883d2 | 1127 | |
f1fd4544 BM |
1128 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) |
1129 | { | |
ed3883d2 BM |
1130 | int extdatalen=0; |
1131 | unsigned char *ret = p; | |
bf48836c BL |
1132 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1133 | int next_proto_neg_seen; | |
ee2ffc27 | 1134 | #endif |
ed3883d2 | 1135 | |
13f6d57b DSH |
1136 | /* don't add extensions for SSLv3, unless doing secure renegotiation */ |
1137 | if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) | |
5f8f94a6 DSH |
1138 | return p; |
1139 | ||
a13c20f6 | 1140 | ret+=2; |
ed3883d2 BM |
1141 | if (ret>=limit) return NULL; /* this really never occurs, but ... */ |
1142 | ||
a13c20f6 | 1143 | if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) |
f1fd4544 | 1144 | { |
761772d7 | 1145 | if ((long)(limit - ret - 4) < 0) return NULL; |
ed3883d2 BM |
1146 | |
1147 | s2n(TLSEXT_TYPE_server_name,ret); | |
1148 | s2n(0,ret); | |
f1fd4544 | 1149 | } |
860c3dd1 | 1150 | |
8025e251 | 1151 | if(s->s3->send_connection_binding) |
860c3dd1 DSH |
1152 | { |
1153 | int el; | |
1154 | ||
1155 | if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) | |
1156 | { | |
1157 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1158 | return NULL; | |
1159 | } | |
1160 | ||
1161 | if((limit - p - 4 - el) < 0) return NULL; | |
1162 | ||
1163 | s2n(TLSEXT_TYPE_renegotiate,ret); | |
1164 | s2n(el,ret); | |
1165 | ||
1166 | if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) | |
1167 | { | |
1168 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1169 | return NULL; | |
1170 | } | |
1171 | ||
1172 | ret += el; | |
1173 | } | |
1174 | ||
36ca4ba6 | 1175 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
1176 | if (s->tlsext_ecpointformatlist != NULL && |
1177 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
1178 | { |
1179 | /* Add TLS extension ECPointFormats to the ServerHello message */ | |
1180 | long lenmax; | |
1181 | ||
761772d7 | 1182 | if ((lenmax = limit - ret - 5) < 0) return NULL; |
36ca4ba6 | 1183 | if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; |
019fdc78 BM |
1184 | if (s->tlsext_ecpointformatlist_length > 255) |
1185 | { | |
1186 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1187 | return NULL; | |
1188 | } | |
36ca4ba6 BM |
1189 | |
1190 | s2n(TLSEXT_TYPE_ec_point_formats,ret); | |
1191 | s2n(s->tlsext_ecpointformatlist_length + 1,ret); | |
1192 | *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; | |
1193 | memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); | |
1194 | ret+=s->tlsext_ecpointformatlist_length; | |
a70183bc | 1195 | |
36ca4ba6 | 1196 | } |
33273721 | 1197 | /* Currently the server should not respond with a SupportedCurves extension */ |
36ca4ba6 | 1198 | #endif /* OPENSSL_NO_EC */ |
67c8e7f4 | 1199 | |
6434abbf DSH |
1200 | if (s->tlsext_ticket_expected |
1201 | && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) | |
1202 | { | |
761772d7 | 1203 | if ((long)(limit - ret - 4) < 0) return NULL; |
6434abbf DSH |
1204 | s2n(TLSEXT_TYPE_session_ticket,ret); |
1205 | s2n(0,ret); | |
1206 | } | |
761772d7 | 1207 | |
67c8e7f4 DSH |
1208 | if (s->tlsext_status_expected) |
1209 | { | |
1210 | if ((long)(limit - ret - 4) < 0) return NULL; | |
1211 | s2n(TLSEXT_TYPE_status_request,ret); | |
1212 | s2n(0,ret); | |
1213 | } | |
1214 | ||
761772d7 | 1215 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
1216 | if (s->s3->server_opaque_prf_input != NULL && |
1217 | s->version != DTLS1_VERSION) | |
761772d7 BM |
1218 | { |
1219 | size_t sol = s->s3->server_opaque_prf_input_len; | |
6434abbf | 1220 | |
761772d7 BM |
1221 | if ((long)(limit - ret - 6 - sol) < 0) |
1222 | return NULL; | |
1223 | if (sol > 0xFFFD) /* can't happen */ | |
1224 | return NULL; | |
1225 | ||
1226 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
1227 | s2n(sol + 2, ret); | |
1228 | s2n(sol, ret); | |
1229 | memcpy(ret, s->s3->server_opaque_prf_input, sol); | |
1230 | ret += sol; | |
1231 | } | |
1232 | #endif | |
333f926d BL |
1233 | |
1234 | if(s->srtp_profile) | |
1235 | { | |
1236 | int el; | |
1237 | ||
1238 | ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0); | |
1239 | ||
1240 | if((limit - p - 4 - el) < 0) return NULL; | |
1241 | ||
1242 | s2n(TLSEXT_TYPE_use_srtp,ret); | |
1243 | s2n(el,ret); | |
1244 | ||
1245 | if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) | |
1246 | { | |
7a236261 | 1247 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); |
333f926d BL |
1248 | return NULL; |
1249 | } | |
1250 | ret+=el; | |
1251 | } | |
1252 | ||
0e1dba93 DSH |
1253 | if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) |
1254 | && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) | |
1255 | { const unsigned char cryptopro_ext[36] = { | |
1256 | 0xfd, 0xe8, /*65000*/ | |
1257 | 0x00, 0x20, /*32 bytes length*/ | |
1258 | 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, | |
1259 | 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, | |
1260 | 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, | |
1261 | 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; | |
1262 | if (limit-ret<36) return NULL; | |
1263 | memcpy(ret,cryptopro_ext,36); | |
1264 | ret+=36; | |
1265 | ||
1266 | } | |
761772d7 | 1267 | |
4817504d | 1268 | #ifndef OPENSSL_NO_HEARTBEATS |
5733919d DSH |
1269 | /* Add Heartbeat extension if we've received one */ |
1270 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) | |
1271 | { | |
1272 | s2n(TLSEXT_TYPE_heartbeat,ret); | |
1273 | s2n(1,ret); | |
1274 | /* Set mode: | |
1275 | * 1: peer may send requests | |
1276 | * 2: peer not allowed to send requests | |
1277 | */ | |
1278 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) | |
1279 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1280 | else | |
1281 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
192540b5 | 1282 | |
5733919d | 1283 | } |
4817504d DSH |
1284 | #endif |
1285 | ||
bf48836c | 1286 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1287 | next_proto_neg_seen = s->s3->next_proto_neg_seen; |
1288 | s->s3->next_proto_neg_seen = 0; | |
1289 | if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) | |
1290 | { | |
1291 | const unsigned char *npa; | |
1292 | unsigned int npalen; | |
1293 | int r; | |
1294 | ||
1295 | r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg); | |
1296 | if (r == SSL_TLSEXT_ERR_OK) | |
1297 | { | |
1298 | if ((long)(limit - ret - 4 - npalen) < 0) return NULL; | |
1299 | s2n(TLSEXT_TYPE_next_proto_neg,ret); | |
1300 | s2n(npalen,ret); | |
1301 | memcpy(ret, npa, npalen); | |
1302 | ret += npalen; | |
1303 | s->s3->next_proto_neg_seen = 1; | |
1304 | } | |
1305 | } | |
1306 | #endif | |
1307 | ||
a9e1c50b BL |
1308 | /* If the client supports authz then see whether we have any to offer |
1309 | * to it. */ | |
1310 | if (s->s3->tlsext_authz_client_types_len) | |
1311 | { | |
1312 | size_t authz_length; | |
1313 | /* By now we already know the new cipher, so we can look ahead | |
1314 | * to see whether the cert we are going to send | |
1315 | * has any authz data attached to it. */ | |
1316 | const unsigned char* authz = ssl_get_authz_data(s, &authz_length); | |
1317 | const unsigned char* const orig_authz = authz; | |
1318 | size_t i; | |
1319 | unsigned authz_count = 0; | |
1320 | ||
1321 | /* The authz data contains a number of the following structures: | |
1322 | * uint8_t authz_type | |
1323 | * uint16_t length | |
1324 | * uint8_t data[length] | |
1325 | * | |
1326 | * First we walk over it to find the number of authz elements. */ | |
1327 | for (i = 0; i < authz_length; i++) | |
1328 | { | |
1329 | unsigned short length; | |
1330 | unsigned char type; | |
1331 | ||
1332 | type = *(authz++); | |
1333 | if (memchr(s->s3->tlsext_authz_client_types, | |
1334 | type, | |
1335 | s->s3->tlsext_authz_client_types_len) != NULL) | |
1336 | authz_count++; | |
1337 | ||
1338 | n2s(authz, length); | |
aeda172a BL |
1339 | /* n2s increments authz by 2 */ |
1340 | i += 2; | |
a9e1c50b BL |
1341 | authz += length; |
1342 | i += length; | |
1343 | } | |
1344 | ||
1345 | if (authz_count) | |
1346 | { | |
1347 | /* Add TLS extension server_authz to the ServerHello message | |
1348 | * 2 bytes for extension type | |
1349 | * 2 bytes for extension length | |
1350 | * 1 byte for the list length | |
1351 | * n bytes for the list */ | |
1352 | const unsigned short ext_len = 1 + authz_count; | |
1353 | ||
1354 | if ((long)(limit - ret - 4 - ext_len) < 0) return NULL; | |
1355 | s2n(TLSEXT_TYPE_server_authz, ret); | |
1356 | s2n(ext_len, ret); | |
1357 | *(ret++) = authz_count; | |
1358 | s->s3->tlsext_authz_promised_to_client = 1; | |
1359 | } | |
1360 | ||
1361 | authz = orig_authz; | |
1362 | for (i = 0; i < authz_length; i++) | |
1363 | { | |
1364 | unsigned short length; | |
1365 | unsigned char type; | |
1366 | ||
1367 | authz_count++; | |
1368 | type = *(authz++); | |
1369 | if (memchr(s->s3->tlsext_authz_client_types, | |
1370 | type, | |
1371 | s->s3->tlsext_authz_client_types_len) != NULL) | |
1372 | *(ret++) = type; | |
1373 | n2s(authz, length); | |
aeda172a BL |
1374 | /* n2s increments authz by 2 */ |
1375 | i += 2; | |
a9e1c50b BL |
1376 | authz += length; |
1377 | i += length; | |
1378 | } | |
1379 | } | |
1380 | ||
ed3883d2 BM |
1381 | if ((extdatalen = ret-p-2)== 0) |
1382 | return p; | |
1383 | ||
1384 | s2n(extdatalen,p); | |
1385 | return ret; | |
52b8dad8 | 1386 | } |
ed3883d2 | 1387 | |
b2284ed3 DSH |
1388 | static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
1389 | { | |
ed3883d2 BM |
1390 | unsigned short type; |
1391 | unsigned short size; | |
1392 | unsigned short len; | |
f1fd4544 | 1393 | unsigned char *data = *p; |
860c3dd1 DSH |
1394 | int renegotiate_seen = 0; |
1395 | ||
a13c20f6 | 1396 | s->servername_done = 0; |
67c8e7f4 | 1397 | s->tlsext_status_type = -1; |
6f31dd72 BM |
1398 | #ifndef OPENSSL_NO_NEXTPROTONEG |
1399 | s->s3->next_proto_neg_seen = 0; | |
1400 | #endif | |
ed3883d2 | 1401 | |
4817504d DSH |
1402 | #ifndef OPENSSL_NO_HEARTBEATS |
1403 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
1404 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
1405 | #endif | |
4453cd8c DSH |
1406 | /* Clear any signature algorithms extension received */ |
1407 | if (s->cert->peer_sigalgs) | |
1408 | { | |
1409 | OPENSSL_free(s->cert->peer_sigalgs); | |
1410 | s->cert->peer_sigalgs = NULL; | |
1411 | } | |
1412 | /* Clear any shared sigtnature algorithms */ | |
1413 | if (s->cert->shared_sigalgs) | |
1414 | { | |
1415 | OPENSSL_free(s->cert->shared_sigalgs); | |
1416 | s->cert->shared_sigalgs = NULL; | |
1417 | } | |
4817504d | 1418 | |
ed3883d2 | 1419 | if (data >= (d+n-2)) |
c27c9cb4 | 1420 | goto ri_check; |
ed3883d2 BM |
1421 | n2s(data,len); |
1422 | ||
52b8dad8 | 1423 | if (data > (d+n-len)) |
c27c9cb4 | 1424 | goto ri_check; |
ed3883d2 | 1425 | |
f1fd4544 BM |
1426 | while (data <= (d+n-4)) |
1427 | { | |
ed3883d2 BM |
1428 | n2s(data,type); |
1429 | n2s(data,size); | |
1430 | ||
1431 | if (data+size > (d+n)) | |
c27c9cb4 | 1432 | goto ri_check; |
8e3b2dbb | 1433 | #if 0 |
0e1dba93 | 1434 | fprintf(stderr,"Received extension type %d size %d\n",type,size); |
8e3b2dbb | 1435 | #endif |
6434abbf DSH |
1436 | if (s->tlsext_debug_cb) |
1437 | s->tlsext_debug_cb(s, 0, type, data, size, | |
1438 | s->tlsext_debug_arg); | |
a13c20f6 BM |
1439 | /* The servername extension is treated as follows: |
1440 | ||
1441 | - Only the hostname type is supported with a maximum length of 255. | |
1442 | - The servername is rejected if too long or if it contains zeros, | |
1443 | in which case an fatal alert is generated. | |
1444 | - The servername field is maintained together with the session cache. | |
1445 | - When a session is resumed, the servername call back invoked in order | |
1446 | to allow the application to position itself to the right context. | |
1447 | - The servername is acknowledged if it is new for a session or when | |
1448 | it is identical to a previously used for the same session. | |
1449 | Applications can control the behaviour. They can at any time | |
1450 | set a 'desirable' servername for a new SSL object. This can be the | |
1451 | case for example with HTTPS when a Host: header field is received and | |
1452 | a renegotiation is requested. In this case, a possible servername | |
1453 | presented in the new client hello is only acknowledged if it matches | |
1454 | the value of the Host: field. | |
1455 | - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | |
1456 | if they provide for changing an explicit servername context for the session, | |
1457 | i.e. when the session has been established with a servername extension. | |
1458 | - On session reconnect, the servername extension may be absent. | |
1459 | ||
1460 | */ | |
1461 | ||
f1fd4544 BM |
1462 | if (type == TLSEXT_TYPE_server_name) |
1463 | { | |
a70183bc | 1464 | unsigned char *sdata; |
ed3883d2 | 1465 | int servname_type; |
a70183bc BM |
1466 | int dsize; |
1467 | ||
1468 | if (size < 2) | |
1469 | { | |
1470 | *al = SSL_AD_DECODE_ERROR; | |
1471 | return 0; | |
1472 | } | |
1473 | n2s(data,dsize); | |
52b8dad8 | 1474 | size -= 2; |
a70183bc | 1475 | if (dsize > size ) |
f1fd4544 | 1476 | { |
a70183bc BM |
1477 | *al = SSL_AD_DECODE_ERROR; |
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | sdata = data; | |
1482 | while (dsize > 3) | |
1483 | { | |
1484 | servname_type = *(sdata++); | |
ed3883d2 | 1485 | n2s(sdata,len); |
a70183bc BM |
1486 | dsize -= 3; |
1487 | ||
1488 | if (len > dsize) | |
f1fd4544 BM |
1489 | { |
1490 | *al = SSL_AD_DECODE_ERROR; | |
1491 | return 0; | |
1492 | } | |
a70183bc | 1493 | if (s->servername_done == 0) |
f1fd4544 BM |
1494 | switch (servname_type) |
1495 | { | |
1496 | case TLSEXT_NAMETYPE_host_name: | |
732d31be | 1497 | if (!s->hit) |
f1fd4544 | 1498 | { |
732d31be DSH |
1499 | if(s->session->tlsext_hostname) |
1500 | { | |
1501 | *al = SSL_AD_DECODE_ERROR; | |
1502 | return 0; | |
1503 | } | |
1504 | if (len > TLSEXT_MAXLEN_host_name) | |
f1fd4544 BM |
1505 | { |
1506 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
1507 | return 0; | |
1508 | } | |
732d31be DSH |
1509 | if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) |
1510 | { | |
1511 | *al = TLS1_AD_INTERNAL_ERROR; | |
1512 | return 0; | |
1513 | } | |
ed3883d2 | 1514 | memcpy(s->session->tlsext_hostname, sdata, len); |
a13c20f6 BM |
1515 | s->session->tlsext_hostname[len]='\0'; |
1516 | if (strlen(s->session->tlsext_hostname) != len) { | |
1517 | OPENSSL_free(s->session->tlsext_hostname); | |
40a70628 | 1518 | s->session->tlsext_hostname = NULL; |
a13c20f6 BM |
1519 | *al = TLS1_AD_UNRECOGNIZED_NAME; |
1520 | return 0; | |
f1fd4544 | 1521 | } |
a13c20f6 BM |
1522 | s->servername_done = 1; |
1523 | ||
a13c20f6 BM |
1524 | } |
1525 | else | |
732d31be DSH |
1526 | s->servername_done = s->session->tlsext_hostname |
1527 | && strlen(s->session->tlsext_hostname) == len | |
6b9e941e | 1528 | && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; |
a13c20f6 | 1529 | |
ed3883d2 | 1530 | break; |
f1fd4544 | 1531 | |
ed3883d2 BM |
1532 | default: |
1533 | break; | |
f1fd4544 | 1534 | } |
52b8dad8 | 1535 | |
a70183bc | 1536 | dsize -= len; |
f1fd4544 | 1537 | } |
a70183bc BM |
1538 | if (dsize != 0) |
1539 | { | |
1540 | *al = SSL_AD_DECODE_ERROR; | |
1541 | return 0; | |
1542 | } | |
1543 | ||
ed3883d2 | 1544 | } |
edc032b5 BL |
1545 | #ifndef OPENSSL_NO_SRP |
1546 | else if (type == TLSEXT_TYPE_srp) | |
1547 | { | |
1df80b65 DSH |
1548 | if (size <= 0 || ((len = data[0])) != (size -1)) |
1549 | { | |
1550 | *al = SSL_AD_DECODE_ERROR; | |
1551 | return 0; | |
1552 | } | |
1553 | if (s->srp_ctx.login != NULL) | |
edc032b5 | 1554 | { |
1df80b65 DSH |
1555 | *al = SSL_AD_DECODE_ERROR; |
1556 | return 0; | |
1557 | } | |
1558 | if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL) | |
1559 | return -1; | |
1560 | memcpy(s->srp_ctx.login, &data[1], len); | |
1561 | s->srp_ctx.login[len]='\0'; | |
1562 | ||
1563 | if (strlen(s->srp_ctx.login) != len) | |
1564 | { | |
1565 | *al = SSL_AD_DECODE_ERROR; | |
1566 | return 0; | |
edc032b5 BL |
1567 | } |
1568 | } | |
1569 | #endif | |
ed3883d2 | 1570 | |
36ca4ba6 | 1571 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
1572 | else if (type == TLSEXT_TYPE_ec_point_formats && |
1573 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
1574 | { |
1575 | unsigned char *sdata = data; | |
1576 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
1577 | |
1578 | if (ecpointformatlist_length != size - 1) | |
1579 | { | |
1580 | *al = TLS1_AD_DECODE_ERROR; | |
1581 | return 0; | |
1582 | } | |
732d31be | 1583 | if (!s->hit) |
36ca4ba6 | 1584 | { |
732d31be DSH |
1585 | if(s->session->tlsext_ecpointformatlist) |
1586 | { | |
7d5686d3 DSH |
1587 | OPENSSL_free(s->session->tlsext_ecpointformatlist); |
1588 | s->session->tlsext_ecpointformatlist = NULL; | |
732d31be DSH |
1589 | } |
1590 | s->session->tlsext_ecpointformatlist_length = 0; | |
1591 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) | |
1592 | { | |
1593 | *al = TLS1_AD_INTERNAL_ERROR; | |
1594 | return 0; | |
1595 | } | |
1596 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
1597 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
36ca4ba6 | 1598 | } |
36ca4ba6 BM |
1599 | #if 0 |
1600 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); | |
1601 | sdata = s->session->tlsext_ecpointformatlist; | |
1602 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
1603 | fprintf(stderr,"%i ",*(sdata++)); | |
1604 | fprintf(stderr,"\n"); | |
33273721 BM |
1605 | #endif |
1606 | } | |
8025e251 DSH |
1607 | else if (type == TLSEXT_TYPE_elliptic_curves && |
1608 | s->version != DTLS1_VERSION) | |
33273721 BM |
1609 | { |
1610 | unsigned char *sdata = data; | |
1611 | int ellipticcurvelist_length = (*(sdata++) << 8); | |
1612 | ellipticcurvelist_length += (*(sdata++)); | |
1613 | ||
1614 | if (ellipticcurvelist_length != size - 2) | |
1615 | { | |
1616 | *al = TLS1_AD_DECODE_ERROR; | |
1617 | return 0; | |
1618 | } | |
732d31be | 1619 | if (!s->hit) |
33273721 | 1620 | { |
732d31be DSH |
1621 | if(s->session->tlsext_ellipticcurvelist) |
1622 | { | |
1623 | *al = TLS1_AD_DECODE_ERROR; | |
1624 | return 0; | |
1625 | } | |
1626 | s->session->tlsext_ellipticcurvelist_length = 0; | |
1627 | if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) | |
1628 | { | |
1629 | *al = TLS1_AD_INTERNAL_ERROR; | |
1630 | return 0; | |
1631 | } | |
1632 | s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; | |
1633 | memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); | |
33273721 | 1634 | } |
33273721 BM |
1635 | #if 0 |
1636 | fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); | |
1637 | sdata = s->session->tlsext_ellipticcurvelist; | |
1638 | for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) | |
1639 | fprintf(stderr,"%i ",*(sdata++)); | |
1640 | fprintf(stderr,"\n"); | |
36ca4ba6 BM |
1641 | #endif |
1642 | } | |
c6a27f01 | 1643 | #endif /* OPENSSL_NO_EC */ |
761772d7 | 1644 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
1645 | else if (type == TLSEXT_TYPE_opaque_prf_input && |
1646 | s->version != DTLS1_VERSION) | |
761772d7 BM |
1647 | { |
1648 | unsigned char *sdata = data; | |
1649 | ||
1650 | if (size < 2) | |
1651 | { | |
1652 | *al = SSL_AD_DECODE_ERROR; | |
1653 | return 0; | |
1654 | } | |
1655 | n2s(sdata, s->s3->client_opaque_prf_input_len); | |
1656 | if (s->s3->client_opaque_prf_input_len != size - 2) | |
1657 | { | |
1658 | *al = SSL_AD_DECODE_ERROR; | |
1659 | return 0; | |
1660 | } | |
1661 | ||
1662 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
1663 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
02c27b11 BM |
1664 | if (s->s3->client_opaque_prf_input_len == 0) |
1665 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
1666 | else | |
1667 | s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); | |
761772d7 BM |
1668 | if (s->s3->client_opaque_prf_input == NULL) |
1669 | { | |
1670 | *al = TLS1_AD_INTERNAL_ERROR; | |
1671 | return 0; | |
1672 | } | |
1673 | } | |
1674 | #endif | |
12bf56c0 DSH |
1675 | else if (type == TLSEXT_TYPE_session_ticket) |
1676 | { | |
1677 | if (s->tls_session_ticket_ext_cb && | |
1678 | !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) | |
1679 | { | |
1680 | *al = TLS1_AD_INTERNAL_ERROR; | |
1681 | return 0; | |
1682 | } | |
1683 | } | |
860c3dd1 DSH |
1684 | else if (type == TLSEXT_TYPE_renegotiate) |
1685 | { | |
1686 | if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) | |
1687 | return 0; | |
1688 | renegotiate_seen = 1; | |
1689 | } | |
6b7be581 DSH |
1690 | else if (type == TLSEXT_TYPE_signature_algorithms) |
1691 | { | |
1692 | int dsize; | |
4453cd8c | 1693 | if (s->cert->peer_sigalgs || size < 2) |
6b7be581 DSH |
1694 | { |
1695 | *al = SSL_AD_DECODE_ERROR; | |
1696 | return 0; | |
1697 | } | |
6b7be581 DSH |
1698 | n2s(data,dsize); |
1699 | size -= 2; | |
4453cd8c | 1700 | if (dsize != size || dsize & 1 || !dsize) |
6b7be581 DSH |
1701 | { |
1702 | *al = SSL_AD_DECODE_ERROR; | |
1703 | return 0; | |
1704 | } | |
1705 | if (!tls1_process_sigalgs(s, data, dsize)) | |
1706 | { | |
1707 | *al = SSL_AD_DECODE_ERROR; | |
1708 | return 0; | |
1709 | } | |
4453cd8c DSH |
1710 | /* If sigalgs received and no shared algorithms fatal |
1711 | * error. | |
1712 | */ | |
1713 | if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs) | |
1714 | { | |
1715 | SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, | |
1716 | SSL_R_NO_SHARED_SIGATURE_ALGORITHMS); | |
1717 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
1718 | return 0; | |
1719 | } | |
6b7be581 | 1720 | } |
8025e251 DSH |
1721 | else if (type == TLSEXT_TYPE_status_request && |
1722 | s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) | |
67c8e7f4 DSH |
1723 | { |
1724 | ||
1725 | if (size < 5) | |
1726 | { | |
1727 | *al = SSL_AD_DECODE_ERROR; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | s->tlsext_status_type = *data++; | |
1732 | size--; | |
1733 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) | |
1734 | { | |
1735 | const unsigned char *sdata; | |
1736 | int dsize; | |
1737 | /* Read in responder_id_list */ | |
1738 | n2s(data,dsize); | |
1739 | size -= 2; | |
1740 | if (dsize > size ) | |
1741 | { | |
1742 | *al = SSL_AD_DECODE_ERROR; | |
1743 | return 0; | |
1744 | } | |
1745 | while (dsize > 0) | |
1746 | { | |
1747 | OCSP_RESPID *id; | |
1748 | int idsize; | |
1749 | if (dsize < 4) | |
1750 | { | |
1751 | *al = SSL_AD_DECODE_ERROR; | |
1752 | return 0; | |
1753 | } | |
1754 | n2s(data, idsize); | |
1755 | dsize -= 2 + idsize; | |
9770924f | 1756 | size -= 2 + idsize; |
67c8e7f4 DSH |
1757 | if (dsize < 0) |
1758 | { | |
1759 | *al = SSL_AD_DECODE_ERROR; | |
1760 | return 0; | |
1761 | } | |
1762 | sdata = data; | |
1763 | data += idsize; | |
1764 | id = d2i_OCSP_RESPID(NULL, | |
1765 | &sdata, idsize); | |
1766 | if (!id) | |
1767 | { | |
1768 | *al = SSL_AD_DECODE_ERROR; | |
1769 | return 0; | |
1770 | } | |
1771 | if (data != sdata) | |
1772 | { | |
1773 | OCSP_RESPID_free(id); | |
1774 | *al = SSL_AD_DECODE_ERROR; | |
1775 | return 0; | |
1776 | } | |
1777 | if (!s->tlsext_ocsp_ids | |
1778 | && !(s->tlsext_ocsp_ids = | |
1779 | sk_OCSP_RESPID_new_null())) | |
1780 | { | |
1781 | OCSP_RESPID_free(id); | |
1782 | *al = SSL_AD_INTERNAL_ERROR; | |
1783 | return 0; | |
1784 | } | |
1785 | if (!sk_OCSP_RESPID_push( | |
1786 | s->tlsext_ocsp_ids, id)) | |
1787 | { | |
1788 | OCSP_RESPID_free(id); | |
1789 | *al = SSL_AD_INTERNAL_ERROR; | |
1790 | return 0; | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | /* Read in request_extensions */ | |
9770924f BM |
1795 | if (size < 2) |
1796 | { | |
1797 | *al = SSL_AD_DECODE_ERROR; | |
1798 | return 0; | |
1799 | } | |
67c8e7f4 DSH |
1800 | n2s(data,dsize); |
1801 | size -= 2; | |
9770924f | 1802 | if (dsize != size) |
67c8e7f4 DSH |
1803 | { |
1804 | *al = SSL_AD_DECODE_ERROR; | |
1805 | return 0; | |
1806 | } | |
1807 | sdata = data; | |
1808 | if (dsize > 0) | |
1809 | { | |
25536ea6 DSH |
1810 | if (s->tlsext_ocsp_exts) |
1811 | { | |
1812 | sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, | |
1813 | X509_EXTENSION_free); | |
1814 | } | |
1815 | ||
67c8e7f4 DSH |
1816 | s->tlsext_ocsp_exts = |
1817 | d2i_X509_EXTENSIONS(NULL, | |
1818 | &sdata, dsize); | |
1819 | if (!s->tlsext_ocsp_exts | |
1820 | || (data + dsize != sdata)) | |
1821 | { | |
1822 | *al = SSL_AD_DECODE_ERROR; | |
1823 | return 0; | |
1824 | } | |
1825 | } | |
1826 | } | |
1827 | /* We don't know what to do with any other type | |
1828 | * so ignore it. | |
1829 | */ | |
1830 | else | |
1831 | s->tlsext_status_type = -1; | |
1832 | } | |
4817504d DSH |
1833 | #ifndef OPENSSL_NO_HEARTBEATS |
1834 | else if (type == TLSEXT_TYPE_heartbeat) | |
1835 | { | |
1836 | switch(data[0]) | |
1837 | { | |
1838 | case 0x01: /* Client allows us to send HB requests */ | |
1839 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1840 | break; | |
1841 | case 0x02: /* Client doesn't accept HB requests */ | |
1842 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
1843 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1844 | break; | |
192540b5 DSH |
1845 | default: *al = SSL_AD_ILLEGAL_PARAMETER; |
1846 | return 0; | |
4817504d DSH |
1847 | } |
1848 | } | |
1849 | #endif | |
bf48836c | 1850 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 | 1851 | else if (type == TLSEXT_TYPE_next_proto_neg && |
71fa4513 | 1852 | s->s3->tmp.finish_md_len == 0) |
ee2ffc27 BL |
1853 | { |
1854 | /* We shouldn't accept this extension on a | |
1855 | * renegotiation. | |
1856 | * | |
1857 | * s->new_session will be set on renegotiation, but we | |
1858 | * probably shouldn't rely that it couldn't be set on | |
1859 | * the initial renegotation too in certain cases (when | |
1860 | * there's some other reason to disallow resuming an | |
1861 | * earlier session -- the current code won't be doing | |
1862 | * anything like that, but this might change). | |
1863 | ||
1864 | * A valid sign that there's been a previous handshake | |
1865 | * in this connection is if s->s3->tmp.finish_md_len > | |
1866 | * 0. (We are talking about a check that will happen | |
1867 | * in the Hello protocol round, well before a new | |
1868 | * Finished message could have been computed.) */ | |
1869 | s->s3->next_proto_neg_seen = 1; | |
1870 | } | |
1871 | #endif | |
761772d7 | 1872 | |
6434abbf | 1873 | /* session ticket processed earlier */ |
333f926d BL |
1874 | else if (type == TLSEXT_TYPE_use_srtp) |
1875 | { | |
1876 | if(ssl_parse_clienthello_use_srtp_ext(s, data, size, | |
1877 | al)) | |
1878 | return 0; | |
1879 | } | |
1880 | ||
a9e1c50b BL |
1881 | else if (type == TLSEXT_TYPE_server_authz) |
1882 | { | |
1883 | unsigned char *sdata = data; | |
1884 | unsigned char server_authz_dataformatlist_length; | |
1885 | ||
1886 | if (size == 0) | |
1887 | { | |
1888 | *al = TLS1_AD_DECODE_ERROR; | |
1889 | return 0; | |
1890 | } | |
1891 | ||
1892 | server_authz_dataformatlist_length = *(sdata++); | |
1893 | ||
1894 | if (server_authz_dataformatlist_length != size - 1) | |
1895 | { | |
1896 | *al = TLS1_AD_DECODE_ERROR; | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | /* Successful session resumption uses the same authz | |
1901 | * information as the original session so we ignore this | |
1902 | * in the case of a session resumption. */ | |
1903 | if (!s->hit) | |
1904 | { | |
1905 | size_t i; | |
195b9eee BL |
1906 | if (s->s3->tlsext_authz_client_types != NULL) |
1907 | OPENSSL_free(s->s3->tlsext_authz_client_types); | |
a9e1c50b BL |
1908 | s->s3->tlsext_authz_client_types = |
1909 | OPENSSL_malloc(server_authz_dataformatlist_length); | |
1910 | if (!s->s3->tlsext_authz_client_types) | |
1911 | { | |
1912 | *al = TLS1_AD_INTERNAL_ERROR; | |
1913 | return 0; | |
1914 | } | |
1915 | ||
1916 | s->s3->tlsext_authz_client_types_len = | |
1917 | server_authz_dataformatlist_length; | |
1918 | memcpy(s->s3->tlsext_authz_client_types, | |
1919 | sdata, | |
1920 | server_authz_dataformatlist_length); | |
1921 | ||
1922 | /* Sort the types in order to check for duplicates. */ | |
1923 | qsort(s->s3->tlsext_authz_client_types, | |
1924 | server_authz_dataformatlist_length, | |
1925 | 1 /* element size */, | |
1926 | byte_compare); | |
1927 | ||
1928 | for (i = 0; i < server_authz_dataformatlist_length; i++) | |
1929 | { | |
1930 | if (i > 0 && | |
1931 | s->s3->tlsext_authz_client_types[i] == | |
1932 | s->s3->tlsext_authz_client_types[i-1]) | |
1933 | { | |
1934 | *al = TLS1_AD_DECODE_ERROR; | |
1935 | return 0; | |
1936 | } | |
1937 | } | |
1938 | } | |
1939 | } | |
1940 | ||
6434abbf | 1941 | data+=size; |
f1fd4544 | 1942 | } |
a9e1c50b | 1943 | |
f1fd4544 | 1944 | *p = data; |
c27c9cb4 DSH |
1945 | |
1946 | ri_check: | |
1947 | ||
1948 | /* Need RI if renegotiating */ | |
1949 | ||
bdd53508 | 1950 | if (!renegotiate_seen && s->renegotiate && |
c27c9cb4 DSH |
1951 | !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) |
1952 | { | |
fbed9f81 | 1953 | *al = SSL_AD_HANDSHAKE_FAILURE; |
aa09c2c6 | 1954 | SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, |
c27c9cb4 DSH |
1955 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
1956 | return 0; | |
1957 | } | |
4453cd8c DSH |
1958 | /* If no signature algorithms extension set default values */ |
1959 | if (!s->cert->peer_sigalgs) | |
1960 | ssl_cert_set_default_md(s->cert); | |
c27c9cb4 | 1961 | |
f1fd4544 | 1962 | return 1; |
52b8dad8 | 1963 | } |
f1fd4544 | 1964 | |
b2284ed3 DSH |
1965 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n) |
1966 | { | |
1967 | int al = -1; | |
1968 | if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0) | |
1969 | { | |
1970 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1971 | return 0; | |
1972 | } | |
1973 | ||
1974 | if (ssl_check_clienthello_tlsext(s) <= 0) | |
1975 | { | |
aa09c2c6 | 1976 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT); |
b2284ed3 DSH |
1977 | return 0; |
1978 | } | |
1979 | return 1; | |
1980 | } | |
1981 | ||
bf48836c | 1982 | #ifndef OPENSSL_NO_NEXTPROTONEG |
ee2ffc27 BL |
1983 | /* ssl_next_proto_validate validates a Next Protocol Negotiation block. No |
1984 | * elements of zero length are allowed and the set of elements must exactly fill | |
1985 | * the length of the block. */ | |
71fa4513 | 1986 | static char ssl_next_proto_validate(unsigned char *d, unsigned len) |
ee2ffc27 BL |
1987 | { |
1988 | unsigned int off = 0; | |
1989 | ||
1990 | while (off < len) | |
1991 | { | |
1992 | if (d[off] == 0) | |
1993 | return 0; | |
1994 | off += d[off]; | |
1995 | off++; | |
1996 | } | |
1997 | ||
1998 | return off == len; | |
1999 | } | |
2000 | #endif | |
2001 | ||
09e4e4b9 | 2002 | static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) |
f1fd4544 | 2003 | { |
c8bbd98a | 2004 | unsigned short length; |
ed3883d2 BM |
2005 | unsigned short type; |
2006 | unsigned short size; | |
ed3883d2 | 2007 | unsigned char *data = *p; |
ed3883d2 | 2008 | int tlsext_servername = 0; |
860c3dd1 | 2009 | int renegotiate_seen = 0; |
ed3883d2 | 2010 | |
6f31dd72 BM |
2011 | #ifndef OPENSSL_NO_NEXTPROTONEG |
2012 | s->s3->next_proto_neg_seen = 0; | |
2013 | #endif | |
2014 | ||
4817504d DSH |
2015 | #ifndef OPENSSL_NO_HEARTBEATS |
2016 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
2017 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
2018 | #endif | |
2019 | ||
ed3883d2 | 2020 | if (data >= (d+n-2)) |
c27c9cb4 | 2021 | goto ri_check; |
ed3883d2 | 2022 | |
c8bbd98a BL |
2023 | n2s(data,length); |
2024 | if (data+length != d+n) | |
2025 | { | |
2026 | *al = SSL_AD_DECODE_ERROR; | |
2027 | return 0; | |
2028 | } | |
ed3883d2 | 2029 | |
f1fd4544 BM |
2030 | while(data <= (d+n-4)) |
2031 | { | |
ed3883d2 BM |
2032 | n2s(data,type); |
2033 | n2s(data,size); | |
2034 | ||
2035 | if (data+size > (d+n)) | |
c27c9cb4 | 2036 | goto ri_check; |
f1fd4544 | 2037 | |
6434abbf DSH |
2038 | if (s->tlsext_debug_cb) |
2039 | s->tlsext_debug_cb(s, 1, type, data, size, | |
2040 | s->tlsext_debug_arg); | |
2041 | ||
f1fd4544 BM |
2042 | if (type == TLSEXT_TYPE_server_name) |
2043 | { | |
2044 | if (s->tlsext_hostname == NULL || size > 0) | |
2045 | { | |
2046 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
2047 | return 0; | |
2048 | } | |
ed3883d2 | 2049 | tlsext_servername = 1; |
f1fd4544 | 2050 | } |
ed3883d2 | 2051 | |
36ca4ba6 | 2052 | #ifndef OPENSSL_NO_EC |
8025e251 DSH |
2053 | else if (type == TLSEXT_TYPE_ec_point_formats && |
2054 | s->version != DTLS1_VERSION) | |
36ca4ba6 BM |
2055 | { |
2056 | unsigned char *sdata = data; | |
2057 | int ecpointformatlist_length = *(sdata++); | |
36ca4ba6 BM |
2058 | |
2059 | if (ecpointformatlist_length != size - 1) | |
2060 | { | |
2061 | *al = TLS1_AD_DECODE_ERROR; | |
2062 | return 0; | |
2063 | } | |
2064 | s->session->tlsext_ecpointformatlist_length = 0; | |
b6acb8d0 | 2065 | if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); |
36ca4ba6 BM |
2066 | if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) |
2067 | { | |
2068 | *al = TLS1_AD_INTERNAL_ERROR; | |
2069 | return 0; | |
2070 | } | |
2071 | s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; | |
2072 | memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); | |
2073 | #if 0 | |
2074 | fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); | |
2075 | sdata = s->session->tlsext_ecpointformatlist; | |
2076 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
2077 | fprintf(stderr,"%i ",*(sdata++)); | |
2078 | fprintf(stderr,"\n"); | |
2079 | #endif | |
2080 | } | |
c6a27f01 | 2081 | #endif /* OPENSSL_NO_EC */ |
6434abbf DSH |
2082 | |
2083 | else if (type == TLSEXT_TYPE_session_ticket) | |
2084 | { | |
12bf56c0 DSH |
2085 | if (s->tls_session_ticket_ext_cb && |
2086 | !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) | |
2087 | { | |
2088 | *al = TLS1_AD_INTERNAL_ERROR; | |
2089 | return 0; | |
2090 | } | |
6434abbf DSH |
2091 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) |
2092 | || (size > 0)) | |
2093 | { | |
2094 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2095 | return 0; | |
2096 | } | |
2097 | s->tlsext_ticket_expected = 1; | |
2098 | } | |
761772d7 | 2099 | #ifdef TLSEXT_TYPE_opaque_prf_input |
8025e251 DSH |
2100 | else if (type == TLSEXT_TYPE_opaque_prf_input && |
2101 | s->version != DTLS1_VERSION) | |
761772d7 BM |
2102 | { |
2103 | unsigned char *sdata = data; | |
2104 | ||
2105 | if (size < 2) | |
2106 | { | |
2107 | *al = SSL_AD_DECODE_ERROR; | |
2108 | return 0; | |
2109 | } | |
2110 | n2s(sdata, s->s3->server_opaque_prf_input_len); | |
2111 | if (s->s3->server_opaque_prf_input_len != size - 2) | |
2112 | { | |
2113 | *al = SSL_AD_DECODE_ERROR; | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
2118 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
02c27b11 BM |
2119 | if (s->s3->server_opaque_prf_input_len == 0) |
2120 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
2121 | else | |
2122 | s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); | |
761772d7 BM |
2123 | |
2124 | if (s->s3->server_opaque_prf_input == NULL) | |
2125 | { | |
2126 | *al = TLS1_AD_INTERNAL_ERROR; | |
2127 | return 0; | |
2128 | } | |
2129 | } | |
2130 | #endif | |
8025e251 DSH |
2131 | else if (type == TLSEXT_TYPE_status_request && |
2132 | s->version != DTLS1_VERSION) | |
67c8e7f4 DSH |
2133 | { |
2134 | /* MUST be empty and only sent if we've requested | |
2135 | * a status request message. | |
2136 | */ | |
2137 | if ((s->tlsext_status_type == -1) || (size > 0)) | |
2138 | { | |
2139 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2140 | return 0; | |
2141 | } | |
2142 | /* Set flag to expect CertificateStatus message */ | |
2143 | s->tlsext_status_expected = 1; | |
2144 | } | |
bf48836c | 2145 | #ifndef OPENSSL_NO_NEXTPROTONEG |
6f31dd72 BM |
2146 | else if (type == TLSEXT_TYPE_next_proto_neg && |
2147 | s->s3->tmp.finish_md_len == 0) | |
ee2ffc27 BL |
2148 | { |
2149 | unsigned char *selected; | |
2150 | unsigned char selected_len; | |
2151 | ||
2152 | /* We must have requested it. */ | |
2153 | if ((s->ctx->next_proto_select_cb == NULL)) | |
2154 | { | |
2155 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2156 | return 0; | |
2157 | } | |
2158 | /* The data must be valid */ | |
2159 | if (!ssl_next_proto_validate(data, size)) | |
2160 | { | |
2161 | *al = TLS1_AD_DECODE_ERROR; | |
2162 | return 0; | |
2163 | } | |
2164 | if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK) | |
2165 | { | |
2166 | *al = TLS1_AD_INTERNAL_ERROR; | |
2167 | return 0; | |
2168 | } | |
2169 | s->next_proto_negotiated = OPENSSL_malloc(selected_len); | |
2170 | if (!s->next_proto_negotiated) | |
2171 | { | |
2172 | *al = TLS1_AD_INTERNAL_ERROR; | |
2173 | return 0; | |
2174 | } | |
2175 | memcpy(s->next_proto_negotiated, selected, selected_len); | |
2176 | s->next_proto_negotiated_len = selected_len; | |
6f31dd72 | 2177 | s->s3->next_proto_neg_seen = 1; |
ee2ffc27 BL |
2178 | } |
2179 | #endif | |
860c3dd1 DSH |
2180 | else if (type == TLSEXT_TYPE_renegotiate) |
2181 | { | |
2182 | if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) | |
2183 | return 0; | |
2184 | renegotiate_seen = 1; | |
2185 | } | |
4817504d DSH |
2186 | #ifndef OPENSSL_NO_HEARTBEATS |
2187 | else if (type == TLSEXT_TYPE_heartbeat) | |
2188 | { | |
2189 | switch(data[0]) | |
2190 | { | |
2191 | case 0x01: /* Server allows us to send HB requests */ | |
2192 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2193 | break; | |
2194 | case 0x02: /* Server doesn't accept HB requests */ | |
2195 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2196 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
2197 | break; | |
192540b5 DSH |
2198 | default: *al = SSL_AD_ILLEGAL_PARAMETER; |
2199 | return 0; | |
4817504d DSH |
2200 | } |
2201 | } | |
2202 | #endif | |
333f926d BL |
2203 | else if (type == TLSEXT_TYPE_use_srtp) |
2204 | { | |
2205 | if(ssl_parse_serverhello_use_srtp_ext(s, data, size, | |
2206 | al)) | |
2207 | return 0; | |
2208 | } | |
2209 | ||
a9e1c50b BL |
2210 | else if (type == TLSEXT_TYPE_server_authz) |
2211 | { | |
2212 | /* We only support audit proofs. It's an error to send | |
2213 | * an authz hello extension if the client | |
2214 | * didn't request a proof. */ | |
2215 | unsigned char *sdata = data; | |
2216 | unsigned char server_authz_dataformatlist_length; | |
2217 | ||
2218 | if (!s->ctx->tlsext_authz_server_audit_proof_cb) | |
2219 | { | |
2220 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2221 | return 0; | |
2222 | } | |
2223 | ||
2224 | if (!size) | |
2225 | { | |
2226 | *al = TLS1_AD_DECODE_ERROR; | |
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | server_authz_dataformatlist_length = *(sdata++); | |
2231 | if (server_authz_dataformatlist_length != size - 1) | |
2232 | { | |
2233 | *al = TLS1_AD_DECODE_ERROR; | |
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | /* We only support audit proofs, so a legal ServerHello | |
2238 | * authz list contains exactly one entry. */ | |
2239 | if (server_authz_dataformatlist_length != 1 || | |
2240 | sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof) | |
2241 | { | |
2242 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2243 | return 0; | |
2244 | } | |
2245 | ||
2246 | s->s3->tlsext_authz_server_promised = 1; | |
2247 | } | |
2248 | ||
2249 | data += size; | |
f1fd4544 | 2250 | } |
ed3883d2 BM |
2251 | |
2252 | if (data != d+n) | |
f1fd4544 BM |
2253 | { |
2254 | *al = SSL_AD_DECODE_ERROR; | |
2255 | return 0; | |
2256 | } | |
ed3883d2 | 2257 | |
f1fd4544 BM |
2258 | if (!s->hit && tlsext_servername == 1) |
2259 | { | |
2260 | if (s->tlsext_hostname) | |
2261 | { | |
2262 | if (s->session->tlsext_hostname == NULL) | |
2263 | { | |
ed3883d2 BM |
2264 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); |
2265 | if (!s->session->tlsext_hostname) | |
f1fd4544 BM |
2266 | { |
2267 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
2268 | return 0; | |
2269 | } | |
2270 | } | |
2271 | else | |
2272 | { | |
2273 | *al = SSL_AD_DECODE_ERROR; | |
2274 | return 0; | |
2275 | } | |
ed3883d2 | 2276 | } |
f1fd4544 | 2277 | } |
ed3883d2 | 2278 | |
f1fd4544 | 2279 | *p = data; |
c27c9cb4 DSH |
2280 | |
2281 | ri_check: | |
2282 | ||
2283 | /* Determine if we need to see RI. Strictly speaking if we want to | |
2284 | * avoid an attack we should *always* see RI even on initial server | |
2285 | * hello because the client doesn't see any renegotiation during an | |
2286 | * attack. However this would mean we could not connect to any server | |
2287 | * which doesn't support RI so for the immediate future tolerate RI | |
2288 | * absence on initial connect only. | |
2289 | */ | |
c2c49969 DSH |
2290 | if (!renegotiate_seen |
2291 | && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
ef51b4b9 | 2292 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) |
c27c9cb4 | 2293 | { |
fbed9f81 | 2294 | *al = SSL_AD_HANDSHAKE_FAILURE; |
09e4e4b9 | 2295 | SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, |
c27c9cb4 DSH |
2296 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); |
2297 | return 0; | |
2298 | } | |
2299 | ||
f1fd4544 | 2300 | return 1; |
52b8dad8 | 2301 | } |
ed3883d2 | 2302 | |
b2172f4f | 2303 | |
36ca4ba6 BM |
2304 | int ssl_prepare_clienthello_tlsext(SSL *s) |
2305 | { | |
761772d7 BM |
2306 | |
2307 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
2308 | { | |
2309 | int r = 1; | |
2310 | ||
2311 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
2312 | { | |
2313 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
2314 | if (!r) | |
2315 | return -1; | |
2316 | } | |
2317 | ||
2318 | if (s->tlsext_opaque_prf_input != NULL) | |
2319 | { | |
2320 | if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ | |
2321 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
2322 | ||
02c27b11 BM |
2323 | if (s->tlsext_opaque_prf_input_len == 0) |
2324 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
2325 | else | |
2326 | s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
2327 | if (s->s3->client_opaque_prf_input == NULL) |
2328 | { | |
2329 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); | |
2330 | return -1; | |
2331 | } | |
2332 | s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2333 | } | |
2334 | ||
2335 | if (r == 2) | |
2336 | /* at callback's request, insist on receiving an appropriate server opaque PRF input */ | |
2337 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2338 | } | |
2339 | #endif | |
2340 | ||
36ca4ba6 | 2341 | return 1; |
52b8dad8 | 2342 | } |
36ca4ba6 BM |
2343 | |
2344 | int ssl_prepare_serverhello_tlsext(SSL *s) | |
2345 | { | |
2346 | #ifndef OPENSSL_NO_EC | |
b6acb8d0 | 2347 | /* If we are server and using an ECC cipher suite, send the point formats we support |
33273721 BM |
2348 | * if the client sent us an ECPointsFormat extension. Note that the server is not |
2349 | * supposed to send an EllipticCurves extension. | |
36ca4ba6 | 2350 | */ |
36ca4ba6 | 2351 | |
52b8dad8 BM |
2352 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
2353 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2354 | int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); | |
2355 | using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); | |
2356 | ||
36ca4ba6 BM |
2357 | if (using_ecc) |
2358 | { | |
b6acb8d0 BM |
2359 | if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); |
2360 | if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) | |
36ca4ba6 | 2361 | { |
a291745e | 2362 | SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); |
36ca4ba6 BM |
2363 | return -1; |
2364 | } | |
b6acb8d0 BM |
2365 | s->tlsext_ecpointformatlist_length = 3; |
2366 | s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; | |
2367 | s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
2368 | s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
36ca4ba6 BM |
2369 | } |
2370 | #endif /* OPENSSL_NO_EC */ | |
761772d7 | 2371 | |
36ca4ba6 | 2372 | return 1; |
52b8dad8 | 2373 | } |
36ca4ba6 | 2374 | |
09e4e4b9 | 2375 | static int ssl_check_clienthello_tlsext(SSL *s) |
f1fd4544 | 2376 | { |
241520e6 | 2377 | int ret=SSL_TLSEXT_ERR_NOACK; |
36ca4ba6 BM |
2378 | int al = SSL_AD_UNRECOGNIZED_NAME; |
2379 | ||
2380 | #ifndef OPENSSL_NO_EC | |
33273721 BM |
2381 | /* The handling of the ECPointFormats extension is done elsewhere, namely in |
2382 | * ssl3_choose_cipher in s3_lib.c. | |
2383 | */ | |
2384 | /* The handling of the EllipticCurves extension is done elsewhere, namely in | |
2385 | * ssl3_choose_cipher in s3_lib.c. | |
36ca4ba6 BM |
2386 | */ |
2387 | #endif | |
2388 | ||
2389 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
2390 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); | |
2391 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) | |
2392 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); | |
2393 | ||
67c8e7f4 DSH |
2394 | /* If status request then ask callback what to do. |
2395 | * Note: this must be called after servername callbacks in case | |
2396 | * the certificate has changed. | |
2397 | */ | |
2bd45dc9 | 2398 | if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) |
67c8e7f4 DSH |
2399 | { |
2400 | int r; | |
2401 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
2402 | switch (r) | |
2403 | { | |
2404 | /* We don't want to send a status request response */ | |
2405 | case SSL_TLSEXT_ERR_NOACK: | |
2406 | s->tlsext_status_expected = 0; | |
2407 | break; | |
2408 | /* status request response should be sent */ | |
2409 | case SSL_TLSEXT_ERR_OK: | |
2410 | if (s->tlsext_ocsp_resp) | |
2411 | s->tlsext_status_expected = 1; | |
2412 | else | |
2413 | s->tlsext_status_expected = 0; | |
2414 | break; | |
2415 | /* something bad happened */ | |
2416 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
2417 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2418 | al = SSL_AD_INTERNAL_ERROR; | |
2419 | goto err; | |
2420 | } | |
2421 | } | |
2422 | else | |
2423 | s->tlsext_status_expected = 0; | |
761772d7 BM |
2424 | |
2425 | #ifdef TLSEXT_TYPE_opaque_prf_input | |
2426 | { | |
2427 | /* This sort of belongs into ssl_prepare_serverhello_tlsext(), | |
2428 | * but we might be sending an alert in response to the client hello, | |
2429 | * so this has to happen here in ssl_check_clienthello_tlsext(). */ | |
2430 | ||
2431 | int r = 1; | |
2432 | ||
2433 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) | |
2434 | { | |
2435 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); | |
2436 | if (!r) | |
2437 | { | |
2438 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2439 | al = SSL_AD_INTERNAL_ERROR; | |
2440 | goto err; | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ | |
2445 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
2446 | s->s3->server_opaque_prf_input = NULL; | |
2447 | ||
2448 | if (s->tlsext_opaque_prf_input != NULL) | |
2449 | { | |
2450 | if (s->s3->client_opaque_prf_input != NULL && | |
2451 | s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) | |
2452 | { | |
2453 | /* can only use this extension if we have a server opaque PRF input | |
2454 | * of the same length as the client opaque PRF input! */ | |
2455 | ||
02c27b11 BM |
2456 | if (s->tlsext_opaque_prf_input_len == 0) |
2457 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ | |
2458 | else | |
2459 | s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); | |
761772d7 BM |
2460 | if (s->s3->server_opaque_prf_input == NULL) |
2461 | { | |
2462 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2463 | al = SSL_AD_INTERNAL_ERROR; | |
2464 | goto err; | |
2465 | } | |
2466 | s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | if (r == 2 && s->s3->server_opaque_prf_input == NULL) | |
2471 | { | |
2472 | /* The callback wants to enforce use of the extension, | |
2473 | * but we can't do that with the client opaque PRF input; | |
2474 | * abort the handshake. | |
2475 | */ | |
2476 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2477 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2478 | } | |
2479 | } | |
761772d7 | 2480 | |
67c8e7f4 | 2481 | #endif |
761772d7 | 2482 | err: |
52b8dad8 BM |
2483 | switch (ret) |
2484 | { | |
36ca4ba6 BM |
2485 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
2486 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
2487 | return -1; | |
2488 | ||
2489 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2490 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
2491 | return 1; | |
2492 | ||
2493 | case SSL_TLSEXT_ERR_NOACK: | |
2494 | s->servername_done=0; | |
2495 | default: | |
2496 | return 1; | |
52b8dad8 | 2497 | } |
36ca4ba6 | 2498 | } |
f1fd4544 | 2499 | |
36ca4ba6 BM |
2500 | int ssl_check_serverhello_tlsext(SSL *s) |
2501 | { | |
2502 | int ret=SSL_TLSEXT_ERR_NOACK; | |
58ece833 | 2503 | int al = SSL_AD_UNRECOGNIZED_NAME; |
241520e6 | 2504 | |
36ca4ba6 | 2505 | #ifndef OPENSSL_NO_EC |
d0205686 DSH |
2506 | /* If we are client and using an elliptic curve cryptography cipher |
2507 | * suite, then if server returns an EC point formats lists extension | |
2508 | * it must contain uncompressed. | |
36ca4ba6 | 2509 | */ |
52b8dad8 BM |
2510 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
2511 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
36ca4ba6 | 2512 | if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && |
d0205686 | 2513 | (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) && |
52b8dad8 | 2514 | ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) |
36ca4ba6 BM |
2515 | { |
2516 | /* we are using an ECC cipher */ | |
90bdfd97 | 2517 | size_t i; |
36ca4ba6 BM |
2518 | unsigned char *list; |
2519 | int found_uncompressed = 0; | |
b9865f11 | 2520 | list = s->session->tlsext_ecpointformatlist; |
36ca4ba6 BM |
2521 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) |
2522 | { | |
2523 | if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) | |
2524 | { | |
2525 | found_uncompressed = 1; | |
2526 | break; | |
2527 | } | |
2528 | } | |
2529 | if (!found_uncompressed) | |
2530 | { | |
a291745e | 2531 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); |
36ca4ba6 BM |
2532 | return -1; |
2533 | } | |
2534 | } | |
2535 | ret = SSL_TLSEXT_ERR_OK; | |
2536 | #endif /* OPENSSL_NO_EC */ | |
2537 | ||
241520e6 | 2538 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) |
58ece833 | 2539 | ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); |
241520e6 | 2540 | else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) |
58ece833 | 2541 | ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); |
241520e6 | 2542 | |
761772d7 BM |
2543 | #ifdef TLSEXT_TYPE_opaque_prf_input |
2544 | if (s->s3->server_opaque_prf_input_len > 0) | |
2545 | { | |
2546 | /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. | |
2547 | * So first verify that we really have a value from the server too. */ | |
2548 | ||
2549 | if (s->s3->server_opaque_prf_input == NULL) | |
2550 | { | |
2551 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2552 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2553 | } | |
2554 | ||
2555 | /* Anytime the server *has* sent an opaque PRF input, we need to check | |
2556 | * that we have a client opaque PRF input of the same size. */ | |
2557 | if (s->s3->client_opaque_prf_input == NULL || | |
2558 | s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) | |
2559 | { | |
2560 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2561 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2562 | } | |
2563 | } | |
2564 | #endif | |
2565 | ||
04e2ab2c DSH |
2566 | /* If we've requested certificate status and we wont get one |
2567 | * tell the callback | |
2568 | */ | |
2569 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
121f9e74 | 2570 | && s->ctx && s->ctx->tlsext_status_cb) |
04e2ab2c DSH |
2571 | { |
2572 | int r; | |
2573 | /* Set resp to NULL, resplen to -1 so callback knows | |
2574 | * there is no response. | |
2575 | */ | |
2576 | if (s->tlsext_ocsp_resp) | |
2577 | { | |
2578 | OPENSSL_free(s->tlsext_ocsp_resp); | |
2579 | s->tlsext_ocsp_resp = NULL; | |
2580 | } | |
2581 | s->tlsext_ocsp_resplen = -1; | |
2582 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
2583 | if (r == 0) | |
2584 | { | |
2585 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
2586 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2587 | } | |
2588 | if (r < 0) | |
2589 | { | |
2590 | al = SSL_AD_INTERNAL_ERROR; | |
2591 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
2592 | } | |
2593 | } | |
2594 | ||
52b8dad8 BM |
2595 | switch (ret) |
2596 | { | |
58ece833 BM |
2597 | case SSL_TLSEXT_ERR_ALERT_FATAL: |
2598 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
2599 | return -1; | |
2600 | ||
2601 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
2602 | ssl3_send_alert(s,SSL3_AL_WARNING,al); | |
2603 | return 1; | |
2604 | ||
2605 | case SSL_TLSEXT_ERR_NOACK: | |
2606 | s->servername_done=0; | |
2607 | default: | |
2608 | return 1; | |
52b8dad8 | 2609 | } |
f1fd4544 | 2610 | } |
33273721 | 2611 | |
09e4e4b9 DSH |
2612 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n) |
2613 | { | |
2614 | int al = -1; | |
2615 | if (s->version < SSL3_VERSION) | |
2616 | return 1; | |
2617 | if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0) | |
2618 | { | |
2619 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
2620 | return 0; | |
2621 | } | |
2622 | ||
2623 | if (ssl_check_serverhello_tlsext(s) <= 0) | |
2624 | { | |
2625 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT); | |
2626 | return 0; | |
2627 | } | |
2628 | return 1; | |
2629 | } | |
2630 | ||
c519e89f BM |
2631 | /* Since the server cache lookup is done early on in the processing of the |
2632 | * ClientHello, and other operations depend on the result, we need to handle | |
2633 | * any TLS session ticket extension at the same time. | |
2634 | * | |
2635 | * session_id: points at the session ID in the ClientHello. This code will | |
2636 | * read past the end of this in order to parse out the session ticket | |
2637 | * extension, if any. | |
2638 | * len: the length of the session ID. | |
2639 | * limit: a pointer to the first byte after the ClientHello. | |
2640 | * ret: (output) on return, if a ticket was decrypted, then this is set to | |
2641 | * point to the resulting session. | |
2642 | * | |
2643 | * If s->tls_session_secret_cb is set then we are expecting a pre-shared key | |
2644 | * ciphersuite, in which case we have no use for session tickets and one will | |
2645 | * never be decrypted, nor will s->tlsext_ticket_expected be set to 1. | |
2646 | * | |
2647 | * Returns: | |
2648 | * -1: fatal error, either from parsing or decrypting the ticket. | |
2649 | * 0: no ticket was found (or was ignored, based on settings). | |
2650 | * 1: a zero length extension was found, indicating that the client supports | |
2651 | * session tickets but doesn't currently have one to offer. | |
2652 | * 2: either s->tls_session_secret_cb was set, or a ticket was offered but | |
2653 | * couldn't be decrypted because of a non-fatal error. | |
2654 | * 3: a ticket was successfully decrypted and *ret was set. | |
2655 | * | |
2656 | * Side effects: | |
2657 | * Sets s->tlsext_ticket_expected to 1 if the server will have to issue | |
2658 | * a new session ticket to the client because the client indicated support | |
2659 | * (and s->tls_session_secret_cb is NULL) but the client either doesn't have | |
2660 | * a session ticket or we couldn't use the one it gave us, or if | |
2661 | * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket. | |
2662 | * Otherwise, s->tlsext_ticket_expected is set to 0. | |
6434abbf | 2663 | */ |
6434abbf | 2664 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, |
c519e89f | 2665 | const unsigned char *limit, SSL_SESSION **ret) |
6434abbf DSH |
2666 | { |
2667 | /* Point after session ID in client hello */ | |
2668 | const unsigned char *p = session_id + len; | |
2669 | unsigned short i; | |
e8da6a1d | 2670 | |
c519e89f BM |
2671 | *ret = NULL; |
2672 | s->tlsext_ticket_expected = 0; | |
2673 | ||
e8da6a1d | 2674 | /* If tickets disabled behave as if no ticket present |
c519e89f BM |
2675 | * to permit stateful resumption. |
2676 | */ | |
e8da6a1d | 2677 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) |
c519e89f | 2678 | return 0; |
6434abbf | 2679 | if ((s->version <= SSL3_VERSION) || !limit) |
c519e89f | 2680 | return 0; |
6434abbf DSH |
2681 | if (p >= limit) |
2682 | return -1; | |
07a9d1a2 DSH |
2683 | /* Skip past DTLS cookie */ |
2684 | if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) | |
2685 | { | |
2686 | i = *(p++); | |
2687 | p+= i; | |
2688 | if (p >= limit) | |
2689 | return -1; | |
2690 | } | |
6434abbf DSH |
2691 | /* Skip past cipher list */ |
2692 | n2s(p, i); | |
2693 | p+= i; | |
2694 | if (p >= limit) | |
2695 | return -1; | |
2696 | /* Skip past compression algorithm list */ | |
2697 | i = *(p++); | |
2698 | p += i; | |
2699 | if (p > limit) | |
2700 | return -1; | |
2701 | /* Now at start of extensions */ | |
2702 | if ((p + 2) >= limit) | |
c519e89f | 2703 | return 0; |
6434abbf DSH |
2704 | n2s(p, i); |
2705 | while ((p + 4) <= limit) | |
2706 | { | |
2707 | unsigned short type, size; | |
2708 | n2s(p, type); | |
2709 | n2s(p, size); | |
2710 | if (p + size > limit) | |
c519e89f | 2711 | return 0; |
6434abbf DSH |
2712 | if (type == TLSEXT_TYPE_session_ticket) |
2713 | { | |
c519e89f | 2714 | int r; |
6434abbf DSH |
2715 | if (size == 0) |
2716 | { | |
c519e89f BM |
2717 | /* The client will accept a ticket but doesn't |
2718 | * currently have one. */ | |
6434abbf | 2719 | s->tlsext_ticket_expected = 1; |
c519e89f | 2720 | return 1; |
6434abbf | 2721 | } |
12bf56c0 DSH |
2722 | if (s->tls_session_secret_cb) |
2723 | { | |
c519e89f BM |
2724 | /* Indicate that the ticket couldn't be |
2725 | * decrypted rather than generating the session | |
2726 | * from ticket now, trigger abbreviated | |
2727 | * handshake based on external mechanism to | |
2728 | * calculate the master secret later. */ | |
2729 | return 2; | |
2730 | } | |
2731 | r = tls_decrypt_ticket(s, p, size, session_id, len, ret); | |
2732 | switch (r) | |
2733 | { | |
2734 | case 2: /* ticket couldn't be decrypted */ | |
2735 | s->tlsext_ticket_expected = 1; | |
2736 | return 2; | |
2737 | case 3: /* ticket was decrypted */ | |
2738 | return r; | |
2739 | case 4: /* ticket decrypted but need to renew */ | |
2740 | s->tlsext_ticket_expected = 1; | |
2741 | return 3; | |
2742 | default: /* fatal error */ | |
2743 | return -1; | |
12bf56c0 | 2744 | } |
6434abbf DSH |
2745 | } |
2746 | p += size; | |
2747 | } | |
c519e89f | 2748 | return 0; |
6434abbf DSH |
2749 | } |
2750 | ||
c519e89f BM |
2751 | /* tls_decrypt_ticket attempts to decrypt a session ticket. |
2752 | * | |
2753 | * etick: points to the body of the session ticket extension. | |
2754 | * eticklen: the length of the session tickets extenion. | |
2755 | * sess_id: points at the session ID. | |
2756 | * sesslen: the length of the session ID. | |
2757 | * psess: (output) on return, if a ticket was decrypted, then this is set to | |
2758 | * point to the resulting session. | |
2759 | * | |
2760 | * Returns: | |
2761 | * -1: fatal error, either from parsing or decrypting the ticket. | |
2762 | * 2: the ticket couldn't be decrypted. | |
2763 | * 3: a ticket was successfully decrypted and *psess was set. | |
2764 | * 4: same as 3, but the ticket needs to be renewed. | |
2765 | */ | |
6434abbf DSH |
2766 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, |
2767 | const unsigned char *sess_id, int sesslen, | |
2768 | SSL_SESSION **psess) | |
2769 | { | |
2770 | SSL_SESSION *sess; | |
2771 | unsigned char *sdec; | |
2772 | const unsigned char *p; | |
8a2062fe | 2773 | int slen, mlen, renew_ticket = 0; |
6434abbf DSH |
2774 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; |
2775 | HMAC_CTX hctx; | |
2776 | EVP_CIPHER_CTX ctx; | |
661dc143 | 2777 | SSL_CTX *tctx = s->initial_ctx; |
8a2062fe DSH |
2778 | /* Need at least keyname + iv + some encrypted data */ |
2779 | if (eticklen < 48) | |
c519e89f | 2780 | return 2; |
8a2062fe DSH |
2781 | /* Initialize session ticket encryption and HMAC contexts */ |
2782 | HMAC_CTX_init(&hctx); | |
2783 | EVP_CIPHER_CTX_init(&ctx); | |
661dc143 | 2784 | if (tctx->tlsext_ticket_key_cb) |
8a2062fe DSH |
2785 | { |
2786 | unsigned char *nctick = (unsigned char *)etick; | |
661dc143 | 2787 | int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, |
8a2062fe DSH |
2788 | &ctx, &hctx, 0); |
2789 | if (rv < 0) | |
2790 | return -1; | |
2791 | if (rv == 0) | |
c519e89f | 2792 | return 2; |
8a2062fe DSH |
2793 | if (rv == 2) |
2794 | renew_ticket = 1; | |
2795 | } | |
2796 | else | |
2797 | { | |
2798 | /* Check key name matches */ | |
661dc143 | 2799 | if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) |
c519e89f | 2800 | return 2; |
661dc143 | 2801 | HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
8a2062fe DSH |
2802 | tlsext_tick_md(), NULL); |
2803 | EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
661dc143 | 2804 | tctx->tlsext_tick_aes_key, etick + 16); |
8a2062fe | 2805 | } |
6434abbf | 2806 | /* Attempt to process session ticket, first conduct sanity and |
c519e89f BM |
2807 | * integrity checks on ticket. |
2808 | */ | |
8a2062fe | 2809 | mlen = HMAC_size(&hctx); |
0eab41fb BL |
2810 | if (mlen < 0) |
2811 | { | |
2812 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2813 | return -1; | |
2814 | } | |
6434abbf | 2815 | eticklen -= mlen; |
6434abbf | 2816 | /* Check HMAC of encrypted ticket */ |
6434abbf DSH |
2817 | HMAC_Update(&hctx, etick, eticklen); |
2818 | HMAC_Final(&hctx, tick_hmac, NULL); | |
2819 | HMAC_CTX_cleanup(&hctx); | |
2820 | if (memcmp(tick_hmac, etick + eticklen, mlen)) | |
c519e89f | 2821 | return 2; |
6434abbf | 2822 | /* Attempt to decrypt session data */ |
6434abbf | 2823 | /* Move p after IV to start of encrypted ticket, update length */ |
8a2062fe DSH |
2824 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); |
2825 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
6434abbf DSH |
2826 | sdec = OPENSSL_malloc(eticklen); |
2827 | if (!sdec) | |
2828 | { | |
2829 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2830 | return -1; | |
2831 | } | |
2832 | EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); | |
2833 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) | |
c519e89f | 2834 | return 2; |
6434abbf DSH |
2835 | slen += mlen; |
2836 | EVP_CIPHER_CTX_cleanup(&ctx); | |
2837 | p = sdec; | |
c519e89f | 2838 | |
6434abbf DSH |
2839 | sess = d2i_SSL_SESSION(NULL, &p, slen); |
2840 | OPENSSL_free(sdec); | |
2841 | if (sess) | |
2842 | { | |
c519e89f BM |
2843 | /* The session ID, if non-empty, is used by some clients to |
2844 | * detect that the ticket has been accepted. So we copy it to | |
2845 | * the session structure. If it is empty set length to zero | |
2846 | * as required by standard. | |
2847 | */ | |
6434abbf DSH |
2848 | if (sesslen) |
2849 | memcpy(sess->session_id, sess_id, sesslen); | |
2850 | sess->session_id_length = sesslen; | |
2851 | *psess = sess; | |
c519e89f BM |
2852 | if (renew_ticket) |
2853 | return 4; | |
2854 | else | |
2855 | return 3; | |
6434abbf | 2856 | } |
c519e89f BM |
2857 | ERR_clear_error(); |
2858 | /* For session parse failure, indicate that we need to send a new | |
2859 | * ticket. */ | |
2860 | return 2; | |
6434abbf | 2861 | } |
6434abbf | 2862 | |
6b7be581 DSH |
2863 | /* Tables to translate from NIDs to TLS v1.2 ids */ |
2864 | ||
2865 | typedef struct | |
2866 | { | |
2867 | int nid; | |
2868 | int id; | |
2869 | } tls12_lookup; | |
2870 | ||
2871 | static tls12_lookup tls12_md[] = { | |
6b7be581 | 2872 | {NID_md5, TLSEXT_hash_md5}, |
6b7be581 | 2873 | {NID_sha1, TLSEXT_hash_sha1}, |
6b7be581 DSH |
2874 | {NID_sha224, TLSEXT_hash_sha224}, |
2875 | {NID_sha256, TLSEXT_hash_sha256}, | |
6b7be581 DSH |
2876 | {NID_sha384, TLSEXT_hash_sha384}, |
2877 | {NID_sha512, TLSEXT_hash_sha512} | |
6b7be581 DSH |
2878 | }; |
2879 | ||
2880 | static tls12_lookup tls12_sig[] = { | |
6b7be581 | 2881 | {EVP_PKEY_RSA, TLSEXT_signature_rsa}, |
6b7be581 | 2882 | {EVP_PKEY_DSA, TLSEXT_signature_dsa}, |
6b7be581 | 2883 | {EVP_PKEY_EC, TLSEXT_signature_ecdsa} |
6b7be581 DSH |
2884 | }; |
2885 | ||
2886 | static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen) | |
2887 | { | |
2888 | size_t i; | |
2889 | for (i = 0; i < tlen; i++) | |
2890 | { | |
2891 | if (table[i].nid == nid) | |
2892 | return table[i].id; | |
2893 | } | |
2894 | return -1; | |
2895 | } | |
e7f8ff43 | 2896 | |
6b7be581 DSH |
2897 | static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen) |
2898 | { | |
2899 | size_t i; | |
2900 | for (i = 0; i < tlen; i++) | |
2901 | { | |
e7f8ff43 | 2902 | if ((table[i].id) == id) |
6b7be581 DSH |
2903 | return table[i].nid; |
2904 | } | |
e7f8ff43 | 2905 | return NID_undef; |
6b7be581 | 2906 | } |
a2f9200f DSH |
2907 | |
2908 | int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md) | |
6b7be581 DSH |
2909 | { |
2910 | int sig_id, md_id; | |
1db5f356 DSH |
2911 | if (!md) |
2912 | return 0; | |
6b7be581 DSH |
2913 | md_id = tls12_find_id(EVP_MD_type(md), tls12_md, |
2914 | sizeof(tls12_md)/sizeof(tls12_lookup)); | |
2915 | if (md_id == -1) | |
2916 | return 0; | |
a2f9200f | 2917 | sig_id = tls12_get_sigid(pk); |
6b7be581 DSH |
2918 | if (sig_id == -1) |
2919 | return 0; | |
2920 | p[0] = (unsigned char)md_id; | |
2921 | p[1] = (unsigned char)sig_id; | |
2922 | return 1; | |
2923 | } | |
2924 | ||
a2f9200f DSH |
2925 | int tls12_get_sigid(const EVP_PKEY *pk) |
2926 | { | |
2927 | return tls12_find_id(pk->type, tls12_sig, | |
2928 | sizeof(tls12_sig)/sizeof(tls12_lookup)); | |
2929 | } | |
2930 | ||
2931 | const EVP_MD *tls12_get_hash(unsigned char hash_alg) | |
2932 | { | |
2933 | switch(hash_alg) | |
2934 | { | |
2935 | #ifndef OPENSSL_NO_MD5 | |
2936 | case TLSEXT_hash_md5: | |
ebc5e72f DSH |
2937 | #ifdef OPENSSL_FIPS |
2938 | if (FIPS_mode()) | |
2939 | return NULL; | |
2940 | #endif | |
a2f9200f DSH |
2941 | return EVP_md5(); |
2942 | #endif | |
2943 | #ifndef OPENSSL_NO_SHA | |
2944 | case TLSEXT_hash_sha1: | |
2945 | return EVP_sha1(); | |
2946 | #endif | |
2947 | #ifndef OPENSSL_NO_SHA256 | |
2948 | case TLSEXT_hash_sha224: | |
2949 | return EVP_sha224(); | |
2950 | ||
2951 | case TLSEXT_hash_sha256: | |
2952 | return EVP_sha256(); | |
2953 | #endif | |
2954 | #ifndef OPENSSL_NO_SHA512 | |
2955 | case TLSEXT_hash_sha384: | |
2956 | return EVP_sha384(); | |
2957 | ||
2958 | case TLSEXT_hash_sha512: | |
2959 | return EVP_sha512(); | |
2960 | #endif | |
2961 | default: | |
2962 | return NULL; | |
2963 | ||
2964 | } | |
2965 | } | |
2966 | ||
4453cd8c DSH |
2967 | static int tls12_get_pkey_idx(unsigned char sig_alg) |
2968 | { | |
2969 | switch(sig_alg) | |
2970 | { | |
2971 | #ifndef OPENSSL_NO_RSA | |
2972 | case TLSEXT_signature_rsa: | |
2973 | return SSL_PKEY_RSA_SIGN; | |
2974 | #endif | |
2975 | #ifndef OPENSSL_NO_DSA | |
2976 | case TLSEXT_signature_dsa: | |
2977 | return SSL_PKEY_DSA_SIGN; | |
2978 | #endif | |
2979 | #ifndef OPENSSL_NO_ECDSA | |
2980 | case TLSEXT_signature_ecdsa: | |
2981 | return SSL_PKEY_ECC; | |
2982 | #endif | |
2983 | } | |
2984 | return -1; | |
2985 | } | |
2986 | ||
2987 | /* Convert TLS 1.2 signature algorithm extension values into NIDs */ | |
2988 | static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid, | |
2989 | int *psignhash_nid, const unsigned char *data) | |
2990 | { | |
2991 | int sign_nid, hash_nid; | |
2992 | if (!phash_nid && !psign_nid && !psignhash_nid) | |
2993 | return; | |
2994 | if (phash_nid || psignhash_nid) | |
2995 | { | |
2996 | hash_nid = tls12_find_nid(data[0], tls12_md, | |
2997 | sizeof(tls12_md)/sizeof(tls12_lookup)); | |
2998 | if (phash_nid) | |
2999 | *phash_nid = hash_nid; | |
3000 | } | |
3001 | if (psign_nid || psignhash_nid) | |
3002 | { | |
3003 | sign_nid = tls12_find_nid(data[1], tls12_sig, | |
3004 | sizeof(tls12_sig)/sizeof(tls12_lookup)); | |
3005 | if (psign_nid) | |
3006 | *psign_nid = sign_nid; | |
3007 | } | |
3008 | if (psignhash_nid) | |
3009 | { | |
3010 | if (sign_nid && hash_nid) | |
3011 | OBJ_find_sigid_by_algs(psignhash_nid, | |
3012 | hash_nid, sign_nid); | |
3013 | else | |
3014 | *psignhash_nid = NID_undef; | |
3015 | } | |
3016 | } | |
3017 | /* Given preference and allowed sigalgs set shared sigalgs */ | |
3018 | static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig, | |
3019 | const unsigned char *pref, size_t preflen, | |
3020 | const unsigned char *allow, size_t allowlen) | |
3021 | { | |
3022 | const unsigned char *ptmp, *atmp; | |
3023 | size_t i, j, nmatch = 0; | |
3024 | for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2) | |
3025 | { | |
3026 | /* Skip disabled hashes or signature algorithms */ | |
3027 | if (tls12_get_hash(ptmp[0]) == NULL) | |
3028 | continue; | |
3029 | if (tls12_get_pkey_idx(ptmp[1]) == -1) | |
3030 | continue; | |
3031 | for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2) | |
3032 | { | |
3033 | if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1]) | |
3034 | { | |
3035 | nmatch++; | |
3036 | if (shsig) | |
3037 | { | |
3038 | shsig->rhash = ptmp[0]; | |
3039 | shsig->rsign = ptmp[1]; | |
3040 | tls1_lookup_sigalg(&shsig->hash_nid, | |
3041 | &shsig->sign_nid, | |
3042 | &shsig->signandhash_nid, | |
3043 | ptmp); | |
3044 | shsig++; | |
3045 | } | |
3046 | break; | |
3047 | } | |
3048 | } | |
3049 | } | |
3050 | return nmatch; | |
3051 | } | |
3052 | ||
3053 | /* Set shared signature algorithms for SSL structures */ | |
3054 | static int tls1_set_shared_sigalgs(SSL *s) | |
3055 | { | |
3056 | const unsigned char *pref, *allow, *conf; | |
3057 | size_t preflen, allowlen, conflen; | |
3058 | size_t nmatch; | |
3059 | TLS_SIGALGS *salgs = NULL; | |
3060 | CERT *c = s->cert; | |
3dbc46df DSH |
3061 | /* If client use client signature algorithms if not NULL */ |
3062 | if (!s->server && c->client_sigalgs) | |
3063 | { | |
3064 | conf = c->client_sigalgs; | |
3065 | conflen = c->client_sigalgslen; | |
3066 | } | |
3067 | else if (c->conf_sigalgs) | |
3068 | { | |
3069 | conf = c->conf_sigalgs; | |
4453cd8c | 3070 | conflen = c->conf_sigalgslen; |
3dbc46df | 3071 | } |
4453cd8c DSH |
3072 | else |
3073 | { | |
3074 | conf = tls12_sigalgs; | |
3075 | conflen = sizeof(tls12_sigalgs); | |
3076 | #ifdef OPENSSL_FIPS | |
3077 | if (FIPS_mode()) | |
3078 | conflen -= 2; | |
3079 | #endif | |
3080 | } | |
3081 | if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) | |
3082 | { | |
3083 | pref = conf; | |
3084 | preflen = conflen; | |
3085 | allow = c->peer_sigalgs; | |
3086 | allowlen = c->peer_sigalgslen; | |
3087 | } | |
3088 | else | |
3089 | { | |
3090 | allow = conf; | |
3091 | allowlen = conflen; | |
3092 | pref = c->peer_sigalgs; | |
3093 | preflen = c->peer_sigalgslen; | |
3094 | } | |
3095 | nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen); | |
3096 | if (!nmatch) | |
3097 | return 1; | |
3098 | salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS)); | |
3099 | if (!salgs) | |
3100 | return 0; | |
3101 | nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen); | |
3102 | c->shared_sigalgs = salgs; | |
3103 | c->shared_sigalgslen = nmatch; | |
3104 | return 1; | |
3105 | } | |
3106 | ||
3107 | ||
6b7be581 DSH |
3108 | /* Set preferred digest for each key type */ |
3109 | ||
8f829124 | 3110 | int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize) |
6b7be581 | 3111 | { |
4453cd8c DSH |
3112 | int idx; |
3113 | size_t i; | |
6b7be581 DSH |
3114 | const EVP_MD *md; |
3115 | CERT *c = s->cert; | |
e7f8ff43 | 3116 | TLS_SIGALGS *sigptr; |
6b7be581 | 3117 | /* Extension ignored for TLS versions below 1.2 */ |
238b6361 | 3118 | if (TLS1_get_version(s) < TLS1_2_VERSION) |
6b7be581 | 3119 | return 1; |
8f829124 DSH |
3120 | /* Should never happen */ |
3121 | if (!c) | |
3122 | return 0; | |
6b7be581 DSH |
3123 | |
3124 | c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL; | |
3125 | c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL; | |
3126 | c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL; | |
3127 | c->pkeys[SSL_PKEY_ECC].digest = NULL; | |
3128 | ||
4453cd8c | 3129 | c->peer_sigalgs = OPENSSL_malloc(dsize); |
0f229cce | 3130 | if (!c->peer_sigalgs) |
e7f8ff43 | 3131 | return 0; |
4453cd8c DSH |
3132 | c->peer_sigalgslen = dsize; |
3133 | memcpy(c->peer_sigalgs, data, dsize); | |
6b7be581 | 3134 | |
4453cd8c | 3135 | tls1_set_shared_sigalgs(s); |
6b7be581 | 3136 | |
4453cd8c DSH |
3137 | for (i = 0, sigptr = c->shared_sigalgs; |
3138 | i < c->shared_sigalgslen; i++, sigptr++) | |
3139 | { | |
3140 | idx = tls12_get_pkey_idx(sigptr->rsign); | |
3141 | if (idx > 0 && c->pkeys[idx].digest == NULL) | |
6b7be581 | 3142 | { |
e7f8ff43 | 3143 | md = tls12_get_hash(sigptr->rhash); |
4453cd8c DSH |
3144 | c->pkeys[idx].digest = md; |
3145 | if (idx == SSL_PKEY_RSA_SIGN) | |
3146 | c->pkeys[SSL_PKEY_RSA_ENC].digest = md; | |
6b7be581 DSH |
3147 | } |
3148 | ||
6b7be581 | 3149 | } |
d61ff83b DSH |
3150 | /* In strict mode leave unset digests as NULL to indicate we can't |
3151 | * use the certificate for signing. | |
6b7be581 | 3152 | */ |
d61ff83b DSH |
3153 | if (!(s->cert->cert_flags & SSL_CERT_FLAG_TLS_STRICT)) |
3154 | { | |
3155 | /* Set any remaining keys to default values. NOTE: if alg is | |
3156 | * not supported it stays as NULL. | |
3157 | */ | |
6b7be581 | 3158 | #ifndef OPENSSL_NO_DSA |
d61ff83b DSH |
3159 | if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest) |
3160 | c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1(); | |
6b7be581 DSH |
3161 | #endif |
3162 | #ifndef OPENSSL_NO_RSA | |
d61ff83b DSH |
3163 | if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) |
3164 | { | |
3165 | c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1(); | |
3166 | c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1(); | |
3167 | } | |
6b7be581 DSH |
3168 | #endif |
3169 | #ifndef OPENSSL_NO_ECDSA | |
d61ff83b DSH |
3170 | if (!c->pkeys[SSL_PKEY_ECC].digest) |
3171 | c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1(); | |
6b7be581 | 3172 | #endif |
d61ff83b | 3173 | } |
6b7be581 DSH |
3174 | return 1; |
3175 | } | |
3176 | ||
4817504d | 3177 | |
e7f8ff43 | 3178 | int SSL_get_sigalgs(SSL *s, int idx, |
4453cd8c | 3179 | int *psign, int *phash, int *psignhash, |
e7f8ff43 DSH |
3180 | unsigned char *rsig, unsigned char *rhash) |
3181 | { | |
4453cd8c DSH |
3182 | const unsigned char *psig = s->cert->peer_sigalgs; |
3183 | if (psig == NULL) | |
e7f8ff43 DSH |
3184 | return 0; |
3185 | if (idx >= 0) | |
3186 | { | |
4453cd8c | 3187 | idx <<= 1; |
0f229cce | 3188 | if (idx >= (int)s->cert->peer_sigalgslen) |
e7f8ff43 | 3189 | return 0; |
4453cd8c | 3190 | psig += idx; |
e7f8ff43 | 3191 | if (rhash) |
4453cd8c DSH |
3192 | *rhash = psig[0]; |
3193 | if (rsig) | |
3194 | *rsig = psig[1]; | |
3195 | tls1_lookup_sigalg(phash, psign, psignhash, psig); | |
e7f8ff43 | 3196 | } |
4453cd8c DSH |
3197 | return s->cert->peer_sigalgslen / 2; |
3198 | } | |
3199 | ||
3200 | int SSL_get_shared_sigalgs(SSL *s, int idx, | |
3201 | int *psign, int *phash, int *psignhash, | |
3202 | unsigned char *rsig, unsigned char *rhash) | |
3203 | { | |
3204 | TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs; | |
3205 | if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen) | |
3206 | return 0; | |
3207 | shsigalgs += idx; | |
3208 | if (phash) | |
3209 | *phash = shsigalgs->hash_nid; | |
3210 | if (psign) | |
3211 | *psign = shsigalgs->sign_nid; | |
3212 | if (psignhash) | |
3213 | *psignhash = shsigalgs->signandhash_nid; | |
3214 | if (rsig) | |
3215 | *rsig = shsigalgs->rsign; | |
3216 | if (rhash) | |
3217 | *rhash = shsigalgs->rhash; | |
3218 | return s->cert->shared_sigalgslen; | |
e7f8ff43 DSH |
3219 | } |
3220 | ||
3221 | ||
4817504d DSH |
3222 | #ifndef OPENSSL_NO_HEARTBEATS |
3223 | int | |
3224 | tls1_process_heartbeat(SSL *s) | |
3225 | { | |
3226 | unsigned char *p = &s->s3->rrec.data[0], *pl; | |
3227 | unsigned short hbtype; | |
3228 | unsigned int payload; | |
3229 | unsigned int padding = 16; /* Use minimum padding */ | |
3230 | ||
3231 | /* Read type and payload length first */ | |
3232 | hbtype = *p++; | |
3233 | n2s(p, payload); | |
3234 | pl = p; | |
3235 | ||
3236 | if (s->msg_callback) | |
3237 | s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT, | |
3238 | &s->s3->rrec.data[0], s->s3->rrec.length, | |
3239 | s, s->msg_callback_arg); | |
3240 | ||
3241 | if (hbtype == TLS1_HB_REQUEST) | |
3242 | { | |
3243 | unsigned char *buffer, *bp; | |
3244 | int r; | |
3245 | ||
3246 | /* Allocate memory for the response, size is 1 bytes | |
3247 | * message type, plus 2 bytes payload length, plus | |
3248 | * payload, plus padding | |
3249 | */ | |
3250 | buffer = OPENSSL_malloc(1 + 2 + payload + padding); | |
3251 | bp = buffer; | |
3252 | ||
3253 | /* Enter response type, length and copy payload */ | |
3254 | *bp++ = TLS1_HB_RESPONSE; | |
3255 | s2n(payload, bp); | |
3256 | memcpy(bp, pl, payload); | |
57cb030c DSH |
3257 | bp += payload; |
3258 | /* Random padding */ | |
3259 | RAND_pseudo_bytes(bp, padding); | |
3260 | ||
4817504d DSH |
3261 | r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding); |
3262 | ||
3263 | if (r >= 0 && s->msg_callback) | |
3264 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
3265 | buffer, 3 + payload + padding, | |
3266 | s, s->msg_callback_arg); | |
3267 | ||
3268 | OPENSSL_free(buffer); | |
3269 | ||
3270 | if (r < 0) | |
3271 | return r; | |
3272 | } | |
3273 | else if (hbtype == TLS1_HB_RESPONSE) | |
3274 | { | |
3275 | unsigned int seq; | |
3276 | ||
3277 | /* We only send sequence numbers (2 bytes unsigned int), | |
3278 | * and 16 random bytes, so we just try to read the | |
3279 | * sequence number */ | |
3280 | n2s(pl, seq); | |
3281 | ||
3282 | if (payload == 18 && seq == s->tlsext_hb_seq) | |
3283 | { | |
3284 | s->tlsext_hb_seq++; | |
3285 | s->tlsext_hb_pending = 0; | |
3286 | } | |
3287 | } | |
3288 | ||
3289 | return 0; | |
3290 | } | |
3291 | ||
3292 | int | |
3293 | tls1_heartbeat(SSL *s) | |
3294 | { | |
3295 | unsigned char *buf, *p; | |
3296 | int ret; | |
3297 | unsigned int payload = 18; /* Sequence number + random bytes */ | |
3298 | unsigned int padding = 16; /* Use minimum padding */ | |
3299 | ||
3300 | /* Only send if peer supports and accepts HB requests... */ | |
3301 | if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) || | |
3302 | s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) | |
3303 | { | |
3304 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT); | |
3305 | return -1; | |
3306 | } | |
3307 | ||
3308 | /* ...and there is none in flight yet... */ | |
3309 | if (s->tlsext_hb_pending) | |
3310 | { | |
3311 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING); | |
3312 | return -1; | |
3313 | } | |
3314 | ||
3315 | /* ...and no handshake in progress. */ | |
3316 | if (SSL_in_init(s) || s->in_handshake) | |
3317 | { | |
3318 | SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE); | |
3319 | return -1; | |
3320 | } | |
3321 | ||
3322 | /* Check if padding is too long, payload and padding | |
3323 | * must not exceed 2^14 - 3 = 16381 bytes in total. | |
3324 | */ | |
3325 | OPENSSL_assert(payload + padding <= 16381); | |
3326 | ||
3327 | /* Create HeartBeat message, we just use a sequence number | |
3328 | * as payload to distuingish different messages and add | |
3329 | * some random stuff. | |
3330 | * - Message Type, 1 byte | |
3331 | * - Payload Length, 2 bytes (unsigned int) | |
3332 | * - Payload, the sequence number (2 bytes uint) | |
3333 | * - Payload, random bytes (16 bytes uint) | |
3334 | * - Padding | |
3335 | */ | |
3336 | buf = OPENSSL_malloc(1 + 2 + payload + padding); | |
3337 | p = buf; | |
3338 | /* Message Type */ | |
3339 | *p++ = TLS1_HB_REQUEST; | |
3340 | /* Payload length (18 bytes here) */ | |
3341 | s2n(payload, p); | |
3342 | /* Sequence number */ | |
3343 | s2n(s->tlsext_hb_seq, p); | |
3344 | /* 16 random bytes */ | |
3345 | RAND_pseudo_bytes(p, 16); | |
3346 | p += 16; | |
3347 | /* Random padding */ | |
3348 | RAND_pseudo_bytes(p, padding); | |
3349 | ||
3350 | ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding); | |
3351 | if (ret >= 0) | |
3352 | { | |
3353 | if (s->msg_callback) | |
3354 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
3355 | buf, 3 + payload + padding, | |
3356 | s, s->msg_callback_arg); | |
3357 | ||
3358 | s->tlsext_hb_pending = 1; | |
3359 | } | |
3360 | ||
3361 | OPENSSL_free(buf); | |
3362 | ||
3363 | return ret; | |
3364 | } | |
3365 | #endif | |
0f229cce | 3366 | |
4453cd8c | 3367 | #define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2) |
0f229cce DSH |
3368 | |
3369 | typedef struct | |
3370 | { | |
3371 | size_t sigalgcnt; | |
3372 | int sigalgs[MAX_SIGALGLEN]; | |
3373 | } sig_cb_st; | |
3374 | ||
3375 | static int sig_cb(const char *elem, int len, void *arg) | |
3376 | { | |
3377 | sig_cb_st *sarg = arg; | |
3378 | size_t i; | |
3379 | char etmp[20], *p; | |
3380 | int sig_alg, hash_alg; | |
3381 | if (sarg->sigalgcnt == MAX_SIGALGLEN) | |
3382 | return 0; | |
3383 | if (len > (int)(sizeof(etmp) - 1)) | |
3384 | return 0; | |
3385 | memcpy(etmp, elem, len); | |
3386 | etmp[len] = 0; | |
3387 | p = strchr(etmp, '+'); | |
3388 | if (!p) | |
3389 | return 0; | |
3390 | *p = 0; | |
3391 | p++; | |
3392 | if (!*p) | |
3393 | return 0; | |
3394 | ||
3395 | if (!strcmp(etmp, "RSA")) | |
3396 | sig_alg = EVP_PKEY_RSA; | |
3397 | else if (!strcmp(etmp, "DSA")) | |
3398 | sig_alg = EVP_PKEY_DSA; | |
3399 | else if (!strcmp(etmp, "ECDSA")) | |
3400 | sig_alg = EVP_PKEY_EC; | |
3401 | else return 0; | |
3402 | ||
3403 | hash_alg = OBJ_sn2nid(p); | |
3404 | if (hash_alg == NID_undef) | |
3405 | hash_alg = OBJ_ln2nid(p); | |
3406 | if (hash_alg == NID_undef) | |
3407 | return 0; | |
3408 | ||
3409 | for (i = 0; i < sarg->sigalgcnt; i+=2) | |
3410 | { | |
3411 | if (sarg->sigalgs[i] == sig_alg | |
3412 | && sarg->sigalgs[i + 1] == hash_alg) | |
3413 | return 0; | |
3414 | } | |
3415 | sarg->sigalgs[sarg->sigalgcnt++] = hash_alg; | |
3416 | sarg->sigalgs[sarg->sigalgcnt++] = sig_alg; | |
3417 | return 1; | |
3418 | } | |
3419 | ||
3420 | /* Set suppored signature algorithms based on a colon separated list | |
3421 | * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */ | |
3dbc46df | 3422 | int tls1_set_sigalgs_list(CERT *c, const char *str, int client) |
0f229cce DSH |
3423 | { |
3424 | sig_cb_st sig; | |
3425 | sig.sigalgcnt = 0; | |
3426 | if (!CONF_parse_list(str, ':', 1, sig_cb, &sig)) | |
3427 | return 0; | |
3dbc46df | 3428 | return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client); |
0f229cce DSH |
3429 | } |
3430 | ||
3dbc46df | 3431 | int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client) |
0f229cce | 3432 | { |
4453cd8c | 3433 | unsigned char *sigalgs, *sptr; |
0f229cce DSH |
3434 | int rhash, rsign; |
3435 | size_t i; | |
3436 | if (salglen & 1) | |
3437 | return 0; | |
4453cd8c | 3438 | sigalgs = OPENSSL_malloc(salglen); |
0f229cce DSH |
3439 | if (sigalgs == NULL) |
3440 | return 0; | |
4453cd8c | 3441 | for (i = 0, sptr = sigalgs; i < salglen; i+=2) |
0f229cce | 3442 | { |
4453cd8c | 3443 | rhash = tls12_find_id(*psig_nids++, tls12_md, |
0f229cce | 3444 | sizeof(tls12_md)/sizeof(tls12_lookup)); |
4453cd8c | 3445 | rsign = tls12_find_id(*psig_nids++, tls12_sig, |
0f229cce DSH |
3446 | sizeof(tls12_sig)/sizeof(tls12_lookup)); |
3447 | ||
3448 | if (rhash == -1 || rsign == -1) | |
3449 | goto err; | |
4453cd8c DSH |
3450 | *sptr++ = rhash; |
3451 | *sptr++ = rsign; | |
0f229cce DSH |
3452 | } |
3453 | ||
3dbc46df DSH |
3454 | if (client) |
3455 | { | |
3456 | if (c->client_sigalgs) | |
3457 | OPENSSL_free(c->client_sigalgs); | |
3458 | c->client_sigalgs = sigalgs; | |
3459 | c->client_sigalgslen = salglen; | |
3460 | } | |
3461 | else | |
3462 | { | |
3463 | if (c->conf_sigalgs) | |
3464 | OPENSSL_free(c->conf_sigalgs); | |
3465 | c->conf_sigalgs = sigalgs; | |
3466 | c->conf_sigalgslen = salglen; | |
3467 | } | |
0f229cce | 3468 | |
0f229cce DSH |
3469 | return 1; |
3470 | ||
3471 | err: | |
3472 | OPENSSL_free(sigalgs); | |
3473 | return 0; | |
3474 | } | |
4453cd8c | 3475 | |
d61ff83b DSH |
3476 | static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid) |
3477 | { | |
3478 | int sig_nid; | |
3479 | size_t i; | |
3480 | if (default_nid == -1) | |
3481 | return 1; | |
3482 | sig_nid = X509_get_signature_nid(x); | |
3483 | if (default_nid) | |
3484 | return sig_nid == default_nid ? 1 : 0; | |
3485 | for (i = 0; i < c->shared_sigalgslen; i++) | |
3486 | if (sig_nid == c->shared_sigalgs[i].signandhash_nid) | |
3487 | return 1; | |
3488 | return 0; | |
3489 | } | |
3490 | ||
3491 | /* Check certificate chain is consistent with TLS extensions and is | |
3492 | * usable by server. | |
3493 | */ | |
3494 | int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain, | |
3495 | int idx) | |
3496 | { | |
3497 | int i; | |
3498 | int rv = CERT_PKEY_INVALID; | |
3499 | CERT_PKEY *cpk = NULL; | |
3500 | CERT *c = s->cert; | |
3501 | if (idx != -1) | |
3502 | { | |
3503 | cpk = c->pkeys + idx; | |
3504 | x = cpk->x509; | |
3505 | pk = cpk->privatekey; | |
3506 | chain = cpk->chain; | |
3507 | /* If no cert or key, forget it */ | |
3508 | if (!x || !pk) | |
3509 | goto end; | |
3510 | } | |
3511 | else | |
3512 | { | |
3513 | idx = ssl_cert_type(x, pk); | |
3514 | if (idx == -1) | |
3515 | goto end; | |
3516 | } | |
3517 | ||
3518 | /* Check all signature algorithms are consistent with | |
3519 | * signature algorithms extension if TLS 1.2 or later | |
3520 | * and strict mode. | |
3521 | */ | |
3522 | if (TLS1_get_version(s) >= TLS1_2_VERSION | |
3523 | && c->cert_flags & SSL_CERT_FLAG_TLS_STRICT) | |
3524 | { | |
3525 | int default_nid; | |
3526 | unsigned char rsign = 0; | |
3527 | if (c->peer_sigalgs) | |
3528 | default_nid = 0; | |
3529 | /* If no sigalgs extension use defaults from RFC5246 */ | |
3530 | else | |
3531 | { | |
3532 | switch(idx) | |
3533 | { | |
3534 | case SSL_PKEY_RSA_ENC: | |
3535 | case SSL_PKEY_RSA_SIGN: | |
3536 | case SSL_PKEY_DH_RSA: | |
3537 | rsign = TLSEXT_signature_rsa; | |
3538 | default_nid = NID_sha1WithRSAEncryption; | |
3539 | break; | |
3540 | ||
3541 | case SSL_PKEY_DSA_SIGN: | |
3542 | case SSL_PKEY_DH_DSA: | |
3543 | rsign = TLSEXT_signature_dsa; | |
3544 | default_nid = NID_dsaWithSHA1; | |
3545 | break; | |
3546 | ||
3547 | case SSL_PKEY_ECC: | |
3548 | rsign = TLSEXT_signature_ecdsa; | |
3549 | default_nid = NID_ecdsa_with_SHA1; | |
3550 | break; | |
3551 | ||
3552 | default: | |
3553 | default_nid = -1; | |
3554 | break; | |
3555 | } | |
3556 | } | |
3557 | /* If peer sent no signature algorithms extension and we | |
3558 | * have set preferred signature algorithms check we support | |
3559 | * sha1. | |
3560 | */ | |
15a70fe5 | 3561 | if (default_nid > 0 && c->conf_sigalgs) |
d61ff83b DSH |
3562 | { |
3563 | size_t j; | |
3564 | const unsigned char *p = c->conf_sigalgs; | |
3565 | for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2) | |
3566 | { | |
3567 | if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign) | |
3568 | break; | |
3569 | } | |
3570 | if (j == c->conf_sigalgslen) | |
3571 | goto end; | |
3572 | } | |
3573 | /* Check signature algorithm of each cert in chain */ | |
3574 | if (!tls1_check_sig_alg(c, x, default_nid)) | |
3575 | goto end; | |
3576 | for (i = 0; i < sk_X509_num(chain); i++) | |
3577 | { | |
3578 | if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), | |
3579 | default_nid)) | |
3580 | goto end; | |
3581 | } | |
3582 | } | |
3583 | ||
3584 | /* Check cert parameters are consistent */ | |
3585 | if (!tls1_check_cert_param(s, x)) | |
3586 | goto end; | |
3587 | /* In strict mode check rest of chain too */ | |
3588 | if (c->cert_flags & SSL_CERT_FLAG_TLS_STRICT) | |
3589 | { | |
3590 | for (i = 0; i < sk_X509_num(chain); i++) | |
3591 | { | |
3592 | if (!tls1_check_cert_param(s, sk_X509_value(chain, i))) | |
3593 | goto end; | |
3594 | } | |
3595 | } | |
3596 | rv = CERT_PKEY_VALID; | |
3597 | ||
3598 | end: | |
3599 | if (cpk) | |
3600 | { | |
3601 | if (rv && cpk->digest) | |
3602 | rv |= CERT_PKEY_SIGN; | |
3603 | cpk->valid_flags = rv; | |
3604 | } | |
3605 | return rv; | |
3606 | } | |
3607 | ||
3608 | /* Set validity of certificates in an SSL structure */ | |
3609 | void tls1_set_cert_validity(SSL *s) | |
3610 | { | |
3611 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC); | |
3612 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN); | |
3613 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN); | |
3614 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA); | |
3615 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA); | |
3616 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC); | |
3617 | } | |
18d71588 DSH |
3618 | /* User level utiity function to check a chain is suitable */ |
3619 | int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain) | |
3620 | { | |
3621 | return tls1_check_chain(s, x, pk, chain, -1); | |
3622 | } | |
d61ff83b | 3623 | |
4453cd8c | 3624 | #endif |