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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. | |
ae5c8664 | 8 | * |
58964a49 RE |
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). | |
ae5c8664 | 15 | * |
58964a49 RE |
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. | |
ae5c8664 | 22 | * |
58964a49 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
58964a49 RE |
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. | |
ae5c8664 | 52 | * |
58964a49 RE |
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 | /* ==================================================================== |
f8e91264 | 59 | * Copyright (c) 1998-2018 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 | |
ae5c8664 | 66 | * notice, this list of conditions and the following disclaimer. |
f1fd4544 BM |
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> | |
b5dc9012 | 116 | #ifndef OPENSSL_NO_EC |
ffa69c1c | 117 | #ifdef OPENSSL_NO_EC2M |
ae5c8664 | 118 | # include <openssl/ec.h> |
ffa69c1c | 119 | #endif |
b5dc9012 | 120 | #endif |
67c8e7f4 | 121 | #include <openssl/ocsp.h> |
bd6941cf | 122 | #include <openssl/rand.h> |
58964a49 RE |
123 | #include "ssl_locl.h" |
124 | ||
ae5c8664 | 125 | const char tls1_version_str[] = "TLSv1" OPENSSL_VERSION_PTEXT; |
58964a49 | 126 | |
367eb1f1 | 127 | #ifndef OPENSSL_NO_TLSEXT |
6434abbf | 128 | static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, |
ae5c8664 MC |
129 | const unsigned char *sess_id, int sesslen, |
130 | SSL_SESSION **psess); | |
da8512aa | 131 | static int ssl_check_clienthello_tlsext_early(SSL *s); |
fe9ce2b7 | 132 | int ssl_check_serverhello_tlsext(SSL *s); |
367eb1f1 | 133 | #endif |
6434abbf | 134 | |
0b9c5da0 MC |
135 | #define CHECKLEN(curr, val, limit) \ |
136 | (((curr) >= (limit)) || (size_t)((limit) - (curr)) < (size_t)(val)) | |
137 | ||
ae5c8664 MC |
138 | SSL3_ENC_METHOD TLSv1_enc_data = { |
139 | tls1_enc, | |
140 | tls1_mac, | |
141 | tls1_setup_key_block, | |
142 | tls1_generate_master_secret, | |
143 | tls1_change_cipher_state, | |
144 | tls1_final_finish_mac, | |
145 | TLS1_FINISH_MAC_LENGTH, | |
146 | tls1_cert_verify_mac, | |
147 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
148 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
149 | tls1_alert_code, | |
150 | tls1_export_keying_material, | |
151 | 0, | |
152 | SSL3_HM_HEADER_LENGTH, | |
153 | ssl3_set_handshake_header, | |
154 | ssl3_handshake_write | |
155 | }; | |
156 | ||
157 | SSL3_ENC_METHOD TLSv1_1_enc_data = { | |
158 | tls1_enc, | |
159 | tls1_mac, | |
160 | tls1_setup_key_block, | |
161 | tls1_generate_master_secret, | |
162 | tls1_change_cipher_state, | |
163 | tls1_final_finish_mac, | |
164 | TLS1_FINISH_MAC_LENGTH, | |
165 | tls1_cert_verify_mac, | |
166 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
167 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
168 | tls1_alert_code, | |
169 | tls1_export_keying_material, | |
170 | SSL_ENC_FLAG_EXPLICIT_IV, | |
171 | SSL3_HM_HEADER_LENGTH, | |
172 | ssl3_set_handshake_header, | |
173 | ssl3_handshake_write | |
174 | }; | |
175 | ||
176 | SSL3_ENC_METHOD TLSv1_2_enc_data = { | |
177 | tls1_enc, | |
178 | tls1_mac, | |
179 | tls1_setup_key_block, | |
180 | tls1_generate_master_secret, | |
181 | tls1_change_cipher_state, | |
182 | tls1_final_finish_mac, | |
183 | TLS1_FINISH_MAC_LENGTH, | |
184 | tls1_cert_verify_mac, | |
185 | TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, | |
186 | TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, | |
187 | tls1_alert_code, | |
188 | tls1_export_keying_material, | |
189 | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS | SSL_ENC_FLAG_SHA256_PRF | |
190 | | SSL_ENC_FLAG_TLS1_2_CIPHERS, | |
191 | SSL3_HM_HEADER_LENGTH, | |
192 | ssl3_set_handshake_header, | |
193 | ssl3_handshake_write | |
194 | }; | |
58964a49 | 195 | |
f3b656b2 | 196 | long tls1_default_timeout(void) |
ae5c8664 MC |
197 | { |
198 | /* | |
199 | * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for | |
200 | * http, the cache would over fill | |
201 | */ | |
202 | return (60 * 60 * 2); | |
203 | } | |
58964a49 | 204 | |
6b691a5c | 205 | int tls1_new(SSL *s) |
ae5c8664 MC |
206 | { |
207 | if (!ssl3_new(s)) | |
208 | return (0); | |
209 | s->method->ssl_clear(s); | |
210 | return (1); | |
211 | } | |
58964a49 | 212 | |
6b691a5c | 213 | void tls1_free(SSL *s) |
ae5c8664 | 214 | { |
12bf56c0 | 215 | #ifndef OPENSSL_NO_TLSEXT |
ae5c8664 MC |
216 | if (s->tlsext_session_ticket) { |
217 | OPENSSL_free(s->tlsext_session_ticket); | |
218 | } | |
219 | #endif /* OPENSSL_NO_TLSEXT */ | |
220 | ssl3_free(s); | |
221 | } | |
58964a49 | 222 | |
6b691a5c | 223 | void tls1_clear(SSL *s) |
ae5c8664 MC |
224 | { |
225 | ssl3_clear(s); | |
226 | s->version = s->method->version; | |
227 | } | |
58964a49 | 228 | |
525de5d3 | 229 | #ifndef OPENSSL_NO_EC |
55a47cd3 | 230 | |
ae5c8664 MC |
231 | static int nid_list[] = { |
232 | NID_sect163k1, /* sect163k1 (1) */ | |
233 | NID_sect163r1, /* sect163r1 (2) */ | |
234 | NID_sect163r2, /* sect163r2 (3) */ | |
235 | NID_sect193r1, /* sect193r1 (4) */ | |
236 | NID_sect193r2, /* sect193r2 (5) */ | |
237 | NID_sect233k1, /* sect233k1 (6) */ | |
238 | NID_sect233r1, /* sect233r1 (7) */ | |
239 | NID_sect239k1, /* sect239k1 (8) */ | |
240 | NID_sect283k1, /* sect283k1 (9) */ | |
241 | NID_sect283r1, /* sect283r1 (10) */ | |
242 | NID_sect409k1, /* sect409k1 (11) */ | |
243 | NID_sect409r1, /* sect409r1 (12) */ | |
244 | NID_sect571k1, /* sect571k1 (13) */ | |
245 | NID_sect571r1, /* sect571r1 (14) */ | |
246 | NID_secp160k1, /* secp160k1 (15) */ | |
247 | NID_secp160r1, /* secp160r1 (16) */ | |
248 | NID_secp160r2, /* secp160r2 (17) */ | |
249 | NID_secp192k1, /* secp192k1 (18) */ | |
250 | NID_X9_62_prime192v1, /* secp192r1 (19) */ | |
251 | NID_secp224k1, /* secp224k1 (20) */ | |
252 | NID_secp224r1, /* secp224r1 (21) */ | |
253 | NID_secp256k1, /* secp256k1 (22) */ | |
254 | NID_X9_62_prime256v1, /* secp256r1 (23) */ | |
255 | NID_secp384r1, /* secp384r1 (24) */ | |
256 | NID_secp521r1, /* secp521r1 (25) */ | |
257 | NID_brainpoolP256r1, /* brainpoolP256r1 (26) */ | |
258 | NID_brainpoolP384r1, /* brainpoolP384r1 (27) */ | |
259 | NID_brainpoolP512r1 /* brainpool512r1 (28) */ | |
260 | }; | |
261 | ||
262 | static const unsigned char ecformats_default[] = { | |
263 | TLSEXT_ECPOINTFORMAT_uncompressed, | |
264 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime, | |
265 | TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 | |
266 | }; | |
267 | ||
f4d1fb77 EK |
268 | /* The client's default curves / the server's 'auto' curves. */ |
269 | static const unsigned char eccurves_auto[] = { | |
270 | /* Prefer P-256 which has the fastest and most secure implementations. */ | |
271 | 0, 23, /* secp256r1 (23) */ | |
272 | /* Other >= 256-bit prime curves. */ | |
ae5c8664 MC |
273 | 0, 25, /* secp521r1 (25) */ |
274 | 0, 28, /* brainpool512r1 (28) */ | |
f4d1fb77 EK |
275 | 0, 27, /* brainpoolP384r1 (27) */ |
276 | 0, 24, /* secp384r1 (24) */ | |
277 | 0, 26, /* brainpoolP256r1 (26) */ | |
278 | 0, 22, /* secp256k1 (22) */ | |
ae5c8664 | 279 | # ifndef OPENSSL_NO_EC2M |
f4d1fb77 EK |
280 | /* >= 256-bit binary curves. */ |
281 | 0, 14, /* sect571r1 (14) */ | |
282 | 0, 13, /* sect571k1 (13) */ | |
ae5c8664 MC |
283 | 0, 11, /* sect409k1 (11) */ |
284 | 0, 12, /* sect409r1 (12) */ | |
f4d1fb77 EK |
285 | 0, 9, /* sect283k1 (9) */ |
286 | 0, 10, /* sect283r1 (10) */ | |
ae5c8664 | 287 | # endif |
f4d1fb77 EK |
288 | }; |
289 | ||
290 | static const unsigned char eccurves_all[] = { | |
291 | /* Prefer P-256 which has the fastest and most secure implementations. */ | |
292 | 0, 23, /* secp256r1 (23) */ | |
293 | /* Other >= 256-bit prime curves. */ | |
294 | 0, 25, /* secp521r1 (25) */ | |
295 | 0, 28, /* brainpool512r1 (28) */ | |
ae5c8664 MC |
296 | 0, 27, /* brainpoolP384r1 (27) */ |
297 | 0, 24, /* secp384r1 (24) */ | |
f4d1fb77 EK |
298 | 0, 26, /* brainpoolP256r1 (26) */ |
299 | 0, 22, /* secp256k1 (22) */ | |
ae5c8664 | 300 | # ifndef OPENSSL_NO_EC2M |
f4d1fb77 EK |
301 | /* >= 256-bit binary curves. */ |
302 | 0, 14, /* sect571r1 (14) */ | |
303 | 0, 13, /* sect571k1 (13) */ | |
304 | 0, 11, /* sect409k1 (11) */ | |
305 | 0, 12, /* sect409r1 (12) */ | |
ae5c8664 MC |
306 | 0, 9, /* sect283k1 (9) */ |
307 | 0, 10, /* sect283r1 (10) */ | |
308 | # endif | |
f4d1fb77 EK |
309 | /* |
310 | * Remaining curves disabled by default but still permitted if set | |
311 | * via an explicit callback or parameters. | |
312 | */ | |
313 | 0, 20, /* secp224k1 (20) */ | |
314 | 0, 21, /* secp224r1 (21) */ | |
315 | 0, 18, /* secp192k1 (18) */ | |
316 | 0, 19, /* secp192r1 (19) */ | |
317 | 0, 15, /* secp160k1 (15) */ | |
318 | 0, 16, /* secp160r1 (16) */ | |
319 | 0, 17, /* secp160r2 (17) */ | |
ae5c8664 MC |
320 | # ifndef OPENSSL_NO_EC2M |
321 | 0, 8, /* sect239k1 (8) */ | |
322 | 0, 6, /* sect233k1 (6) */ | |
323 | 0, 7, /* sect233r1 (7) */ | |
ae5c8664 MC |
324 | 0, 4, /* sect193r1 (4) */ |
325 | 0, 5, /* sect193r2 (5) */ | |
ae5c8664 MC |
326 | 0, 1, /* sect163k1 (1) */ |
327 | 0, 2, /* sect163r1 (2) */ | |
328 | 0, 3, /* sect163r2 (3) */ | |
329 | # endif | |
ae5c8664 MC |
330 | }; |
331 | ||
332 | static const unsigned char suiteb_curves[] = { | |
333 | 0, TLSEXT_curve_P_256, | |
334 | 0, TLSEXT_curve_P_384 | |
335 | }; | |
336 | ||
337 | # ifdef OPENSSL_FIPS | |
3b4a7618 | 338 | /* Brainpool not allowed in FIPS mode */ |
ae5c8664 MC |
339 | static const unsigned char fips_curves_default[] = { |
340 | # ifndef OPENSSL_NO_EC2M | |
341 | 0, 14, /* sect571r1 (14) */ | |
342 | 0, 13, /* sect571k1 (13) */ | |
343 | # endif | |
344 | 0, 25, /* secp521r1 (25) */ | |
345 | # ifndef OPENSSL_NO_EC2M | |
346 | 0, 11, /* sect409k1 (11) */ | |
347 | 0, 12, /* sect409r1 (12) */ | |
348 | # endif | |
349 | 0, 24, /* secp384r1 (24) */ | |
350 | # ifndef OPENSSL_NO_EC2M | |
351 | 0, 9, /* sect283k1 (9) */ | |
352 | 0, 10, /* sect283r1 (10) */ | |
353 | # endif | |
354 | 0, 22, /* secp256k1 (22) */ | |
355 | 0, 23, /* secp256r1 (23) */ | |
356 | # ifndef OPENSSL_NO_EC2M | |
357 | 0, 8, /* sect239k1 (8) */ | |
358 | 0, 6, /* sect233k1 (6) */ | |
359 | 0, 7, /* sect233r1 (7) */ | |
360 | # endif | |
361 | 0, 20, /* secp224k1 (20) */ | |
362 | 0, 21, /* secp224r1 (21) */ | |
363 | # ifndef OPENSSL_NO_EC2M | |
364 | 0, 4, /* sect193r1 (4) */ | |
365 | 0, 5, /* sect193r2 (5) */ | |
366 | # endif | |
367 | 0, 18, /* secp192k1 (18) */ | |
368 | 0, 19, /* secp192r1 (19) */ | |
369 | # ifndef OPENSSL_NO_EC2M | |
370 | 0, 1, /* sect163k1 (1) */ | |
371 | 0, 2, /* sect163r1 (2) */ | |
372 | 0, 3, /* sect163r2 (3) */ | |
373 | # endif | |
374 | 0, 15, /* secp160k1 (15) */ | |
375 | 0, 16, /* secp160r1 (16) */ | |
376 | 0, 17, /* secp160r2 (17) */ | |
377 | }; | |
378 | # endif | |
3b4a7618 | 379 | |
525de5d3 | 380 | int tls1_ec_curve_id2nid(int curve_id) |
ae5c8664 MC |
381 | { |
382 | /* ECC curves from RFC 4492 and RFC 7027 */ | |
383 | if ((curve_id < 1) || ((unsigned int)curve_id > | |
384 | sizeof(nid_list) / sizeof(nid_list[0]))) | |
385 | return 0; | |
386 | return nid_list[curve_id - 1]; | |
387 | } | |
525de5d3 DSH |
388 | |
389 | int tls1_ec_nid2curve_id(int nid) | |
ae5c8664 MC |
390 | { |
391 | /* ECC curves from RFC 4492 and RFC 7027 */ | |
392 | switch (nid) { | |
393 | case NID_sect163k1: /* sect163k1 (1) */ | |
394 | return 1; | |
395 | case NID_sect163r1: /* sect163r1 (2) */ | |
396 | return 2; | |
397 | case NID_sect163r2: /* sect163r2 (3) */ | |
398 | return 3; | |
399 | case NID_sect193r1: /* sect193r1 (4) */ | |
400 | return 4; | |
401 | case NID_sect193r2: /* sect193r2 (5) */ | |
402 | return 5; | |
403 | case NID_sect233k1: /* sect233k1 (6) */ | |
404 | return 6; | |
405 | case NID_sect233r1: /* sect233r1 (7) */ | |
406 | return 7; | |
407 | case NID_sect239k1: /* sect239k1 (8) */ | |
408 | return 8; | |
409 | case NID_sect283k1: /* sect283k1 (9) */ | |
410 | return 9; | |
411 | case NID_sect283r1: /* sect283r1 (10) */ | |
412 | return 10; | |
413 | case NID_sect409k1: /* sect409k1 (11) */ | |
414 | return 11; | |
415 | case NID_sect409r1: /* sect409r1 (12) */ | |
416 | return 12; | |
417 | case NID_sect571k1: /* sect571k1 (13) */ | |
418 | return 13; | |
419 | case NID_sect571r1: /* sect571r1 (14) */ | |
420 | return 14; | |
421 | case NID_secp160k1: /* secp160k1 (15) */ | |
422 | return 15; | |
423 | case NID_secp160r1: /* secp160r1 (16) */ | |
424 | return 16; | |
425 | case NID_secp160r2: /* secp160r2 (17) */ | |
426 | return 17; | |
427 | case NID_secp192k1: /* secp192k1 (18) */ | |
428 | return 18; | |
429 | case NID_X9_62_prime192v1: /* secp192r1 (19) */ | |
430 | return 19; | |
431 | case NID_secp224k1: /* secp224k1 (20) */ | |
432 | return 20; | |
433 | case NID_secp224r1: /* secp224r1 (21) */ | |
434 | return 21; | |
435 | case NID_secp256k1: /* secp256k1 (22) */ | |
436 | return 22; | |
437 | case NID_X9_62_prime256v1: /* secp256r1 (23) */ | |
438 | return 23; | |
439 | case NID_secp384r1: /* secp384r1 (24) */ | |
440 | return 24; | |
441 | case NID_secp521r1: /* secp521r1 (25) */ | |
442 | return 25; | |
443 | case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */ | |
444 | return 26; | |
445 | case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */ | |
446 | return 27; | |
447 | case NID_brainpoolP512r1: /* brainpool512r1 (28) */ | |
448 | return 28; | |
449 | default: | |
450 | return 0; | |
451 | } | |
452 | } | |
453 | ||
533814c6 EK |
454 | /* |
455 | * Get curves list, if "sess" is set return client curves otherwise | |
456 | * preferred list. | |
457 | * Sets |num_curves| to the number of curves in the list, i.e., | |
458 | * the length of |pcurves| is 2 * num_curves. | |
459 | * Returns 1 on success and 0 if the client curves list has invalid format. | |
460 | * The latter indicates an internal error: we should not be accepting such | |
461 | * lists in the first place. | |
462 | * TODO(emilia): we should really be storing the curves list in explicitly | |
463 | * parsed form instead. (However, this would affect binary compatibility | |
464 | * so cannot happen in the 1.0.x series.) | |
c132ca95 | 465 | */ |
533814c6 | 466 | static int tls1_get_curvelist(SSL *s, int sess, |
ae5c8664 MC |
467 | const unsigned char **pcurves, |
468 | size_t *num_curves) | |
469 | { | |
470 | size_t pcurveslen = 0; | |
471 | if (sess) { | |
472 | *pcurves = s->session->tlsext_ellipticcurvelist; | |
473 | pcurveslen = s->session->tlsext_ellipticcurvelist_length; | |
474 | } else { | |
475 | /* For Suite B mode only include P-256, P-384 */ | |
476 | switch (tls1_suiteb(s)) { | |
477 | case SSL_CERT_FLAG_SUITEB_128_LOS: | |
478 | *pcurves = suiteb_curves; | |
479 | pcurveslen = sizeof(suiteb_curves); | |
480 | break; | |
481 | ||
482 | case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY: | |
483 | *pcurves = suiteb_curves; | |
484 | pcurveslen = 2; | |
485 | break; | |
486 | ||
487 | case SSL_CERT_FLAG_SUITEB_192_LOS: | |
488 | *pcurves = suiteb_curves + 2; | |
489 | pcurveslen = 2; | |
490 | break; | |
491 | default: | |
492 | *pcurves = s->tlsext_ellipticcurvelist; | |
493 | pcurveslen = s->tlsext_ellipticcurvelist_length; | |
494 | } | |
495 | if (!*pcurves) { | |
496 | # ifdef OPENSSL_FIPS | |
497 | if (FIPS_mode()) { | |
498 | *pcurves = fips_curves_default; | |
6fa805f5 | 499 | pcurveslen = sizeof(fips_curves_default); |
ae5c8664 MC |
500 | } else |
501 | # endif | |
502 | { | |
822d265c | 503 | if (!s->server || s->cert->ecdh_tmp_auto) { |
f4d1fb77 EK |
504 | *pcurves = eccurves_auto; |
505 | pcurveslen = sizeof(eccurves_auto); | |
506 | } else { | |
507 | *pcurves = eccurves_all; | |
508 | pcurveslen = sizeof(eccurves_all); | |
509 | } | |
ae5c8664 MC |
510 | } |
511 | } | |
512 | } | |
513 | /* We do not allow odd length arrays to enter the system. */ | |
514 | if (pcurveslen & 1) { | |
515 | SSLerr(SSL_F_TLS1_GET_CURVELIST, ERR_R_INTERNAL_ERROR); | |
516 | *num_curves = 0; | |
517 | return 0; | |
518 | } else { | |
519 | *num_curves = pcurveslen / 2; | |
520 | return 1; | |
521 | } | |
522 | } | |
523 | ||
44adfeb6 DSH |
524 | /* Check a curve is one of our preferences */ |
525 | int tls1_check_curve(SSL *s, const unsigned char *p, size_t len) | |
ae5c8664 MC |
526 | { |
527 | const unsigned char *curves; | |
528 | size_t num_curves, i; | |
529 | unsigned int suiteb_flags = tls1_suiteb(s); | |
530 | if (len != 3 || p[0] != NAMED_CURVE_TYPE) | |
531 | return 0; | |
532 | /* Check curve matches Suite B preferences */ | |
533 | if (suiteb_flags) { | |
534 | unsigned long cid = s->s3->tmp.new_cipher->id; | |
535 | if (p[1]) | |
536 | return 0; | |
537 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) { | |
538 | if (p[2] != TLSEXT_curve_P_256) | |
539 | return 0; | |
540 | } else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) { | |
541 | if (p[2] != TLSEXT_curve_P_384) | |
542 | return 0; | |
543 | } else /* Should never happen */ | |
544 | return 0; | |
545 | } | |
546 | if (!tls1_get_curvelist(s, 0, &curves, &num_curves)) | |
547 | return 0; | |
548 | for (i = 0; i < num_curves; i++, curves += 2) { | |
549 | if (p[1] == curves[0] && p[2] == curves[1]) | |
550 | return 1; | |
551 | } | |
552 | return 0; | |
553 | } | |
6b870763 | 554 | |
6977c7e2 | 555 | /*- |
bd34823e EK |
556 | * Return |nmatch|th shared curve or NID_undef if there is no match. |
557 | * For nmatch == -1, return number of matches | |
558 | * For nmatch == -2, return the NID of the curve to use for | |
559 | * an EC tmp key, or NID_undef if there is no match. | |
6b870763 | 560 | */ |
e46c807e | 561 | int tls1_shared_curve(SSL *s, int nmatch) |
ae5c8664 MC |
562 | { |
563 | const unsigned char *pref, *supp; | |
564 | size_t num_pref, num_supp, i, j; | |
565 | int k; | |
566 | /* Can't do anything on client side */ | |
567 | if (s->server == 0) | |
568 | return -1; | |
569 | if (nmatch == -2) { | |
570 | if (tls1_suiteb(s)) { | |
571 | /* | |
572 | * For Suite B ciphersuite determines curve: we already know | |
573 | * these are acceptable due to previous checks. | |
574 | */ | |
575 | unsigned long cid = s->s3->tmp.new_cipher->id; | |
576 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) | |
577 | return NID_X9_62_prime256v1; /* P-256 */ | |
578 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) | |
579 | return NID_secp384r1; /* P-384 */ | |
580 | /* Should never happen */ | |
581 | return NID_undef; | |
582 | } | |
583 | /* If not Suite B just return first preference shared curve */ | |
584 | nmatch = 0; | |
585 | } | |
586 | /* | |
587 | * Avoid truncation. tls1_get_curvelist takes an int | |
588 | * but s->options is a long... | |
589 | */ | |
590 | if (!tls1_get_curvelist | |
591 | (s, (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0, &supp, | |
592 | &num_supp)) | |
593 | /* In practice, NID_undef == 0 but let's be precise. */ | |
594 | return nmatch == -1 ? 0 : NID_undef; | |
595 | if (!tls1_get_curvelist | |
596 | (s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE), &pref, | |
597 | &num_pref)) | |
598 | return nmatch == -1 ? 0 : NID_undef; | |
ba9d44b2 KR |
599 | |
600 | /* | |
601 | * If the client didn't send the elliptic_curves extension all of them | |
602 | * are allowed. | |
603 | */ | |
604 | if (num_supp == 0 && (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0) { | |
605 | supp = eccurves_all; | |
606 | num_supp = sizeof(eccurves_all) / 2; | |
607 | } else if (num_pref == 0 && | |
608 | (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0) { | |
609 | pref = eccurves_all; | |
610 | num_pref = sizeof(eccurves_all) / 2; | |
611 | } | |
612 | ||
ae5c8664 MC |
613 | k = 0; |
614 | for (i = 0; i < num_pref; i++, pref += 2) { | |
615 | const unsigned char *tsupp = supp; | |
616 | for (j = 0; j < num_supp; j++, tsupp += 2) { | |
617 | if (pref[0] == tsupp[0] && pref[1] == tsupp[1]) { | |
618 | if (nmatch == k) { | |
619 | int id = (pref[0] << 8) | pref[1]; | |
620 | return tls1_ec_curve_id2nid(id); | |
621 | } | |
622 | k++; | |
623 | } | |
624 | } | |
625 | } | |
626 | if (nmatch == -1) | |
627 | return k; | |
628 | /* Out of range (nmatch > k). */ | |
629 | return NID_undef; | |
630 | } | |
6b870763 DSH |
631 | |
632 | int tls1_set_curves(unsigned char **pext, size_t *pextlen, | |
ae5c8664 MC |
633 | int *curves, size_t ncurves) |
634 | { | |
635 | unsigned char *clist, *p; | |
636 | size_t i; | |
637 | /* | |
638 | * Bitmap of curves included to detect duplicates: only works while curve | |
639 | * ids < 32 | |
640 | */ | |
641 | unsigned long dup_list = 0; | |
642 | # ifdef OPENSSL_NO_EC2M | |
643 | EC_GROUP *curve; | |
644 | # endif | |
645 | ||
646 | clist = OPENSSL_malloc(ncurves * 2); | |
647 | if (!clist) | |
648 | return 0; | |
649 | for (i = 0, p = clist; i < ncurves; i++) { | |
650 | unsigned long idmask; | |
651 | int id; | |
652 | id = tls1_ec_nid2curve_id(curves[i]); | |
653 | # ifdef OPENSSL_FIPS | |
654 | /* NB: 25 is last curve ID supported by FIPS module */ | |
655 | if (FIPS_mode() && id > 25) { | |
656 | OPENSSL_free(clist); | |
657 | return 0; | |
658 | } | |
659 | # endif | |
660 | # ifdef OPENSSL_NO_EC2M | |
661 | curve = EC_GROUP_new_by_curve_name(curves[i]); | |
662 | if (!curve || EC_METHOD_get_field_type(EC_GROUP_method_of(curve)) | |
663 | == NID_X9_62_characteristic_two_field) { | |
664 | if (curve) | |
665 | EC_GROUP_free(curve); | |
666 | OPENSSL_free(clist); | |
667 | return 0; | |
668 | } else | |
669 | EC_GROUP_free(curve); | |
670 | # endif | |
671 | idmask = 1L << id; | |
672 | if (!id || (dup_list & idmask)) { | |
673 | OPENSSL_free(clist); | |
674 | return 0; | |
675 | } | |
676 | dup_list |= idmask; | |
677 | s2n(id, p); | |
678 | } | |
679 | if (*pext) | |
680 | OPENSSL_free(*pext); | |
681 | *pext = clist; | |
682 | *pextlen = ncurves * 2; | |
683 | return 1; | |
684 | } | |
ffa69c1c | 685 | |
ae5c8664 MC |
686 | # define MAX_CURVELIST 28 |
687 | ||
688 | typedef struct { | |
689 | size_t nidcnt; | |
690 | int nid_arr[MAX_CURVELIST]; | |
691 | } nid_cb_st; | |
6b870763 DSH |
692 | |
693 | static int nid_cb(const char *elem, int len, void *arg) | |
ae5c8664 MC |
694 | { |
695 | nid_cb_st *narg = arg; | |
696 | size_t i; | |
697 | int nid; | |
698 | char etmp[20]; | |
63c1d16b KR |
699 | if (elem == NULL) |
700 | return 0; | |
ae5c8664 MC |
701 | if (narg->nidcnt == MAX_CURVELIST) |
702 | return 0; | |
703 | if (len > (int)(sizeof(etmp) - 1)) | |
704 | return 0; | |
705 | memcpy(etmp, elem, len); | |
706 | etmp[len] = 0; | |
707 | nid = EC_curve_nist2nid(etmp); | |
708 | if (nid == NID_undef) | |
709 | nid = OBJ_sn2nid(etmp); | |
710 | if (nid == NID_undef) | |
711 | nid = OBJ_ln2nid(etmp); | |
712 | if (nid == NID_undef) | |
713 | return 0; | |
714 | for (i = 0; i < narg->nidcnt; i++) | |
715 | if (narg->nid_arr[i] == nid) | |
716 | return 0; | |
717 | narg->nid_arr[narg->nidcnt++] = nid; | |
718 | return 1; | |
719 | } | |
720 | ||
6b870763 | 721 | /* Set curves based on a colon separate list */ |
ae5c8664 MC |
722 | int tls1_set_curves_list(unsigned char **pext, size_t *pextlen, |
723 | const char *str) | |
724 | { | |
725 | nid_cb_st ncb; | |
726 | ncb.nidcnt = 0; | |
727 | if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb)) | |
728 | return 0; | |
729 | if (pext == NULL) | |
730 | return 1; | |
731 | return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt); | |
732 | } | |
733 | ||
c132ca95 DSH |
734 | /* For an EC key set TLS id and required compression based on parameters */ |
735 | static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id, | |
ae5c8664 MC |
736 | EC_KEY *ec) |
737 | { | |
738 | int is_prime, id; | |
739 | const EC_GROUP *grp; | |
740 | const EC_METHOD *meth; | |
741 | if (!ec) | |
742 | return 0; | |
743 | /* Determine if it is a prime field */ | |
744 | grp = EC_KEY_get0_group(ec); | |
745 | if (!grp) | |
746 | return 0; | |
747 | meth = EC_GROUP_method_of(grp); | |
748 | if (!meth) | |
749 | return 0; | |
750 | if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field) | |
751 | is_prime = 1; | |
752 | else | |
753 | is_prime = 0; | |
754 | /* Determine curve ID */ | |
755 | id = EC_GROUP_get_curve_name(grp); | |
756 | id = tls1_ec_nid2curve_id(id); | |
757 | /* If we have an ID set it, otherwise set arbitrary explicit curve */ | |
758 | if (id) { | |
759 | curve_id[0] = 0; | |
760 | curve_id[1] = (unsigned char)id; | |
761 | } else { | |
762 | curve_id[0] = 0xff; | |
763 | if (is_prime) | |
764 | curve_id[1] = 0x01; | |
765 | else | |
766 | curve_id[1] = 0x02; | |
767 | } | |
768 | if (comp_id) { | |
769 | if (EC_KEY_get0_public_key(ec) == NULL) | |
770 | return 0; | |
771 | if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) { | |
772 | if (is_prime) | |
773 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; | |
774 | else | |
775 | *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; | |
776 | } else | |
777 | *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed; | |
778 | } | |
779 | return 1; | |
780 | } | |
781 | ||
c132ca95 DSH |
782 | /* Check an EC key is compatible with extensions */ |
783 | static int tls1_check_ec_key(SSL *s, | |
ae5c8664 MC |
784 | unsigned char *curve_id, unsigned char *comp_id) |
785 | { | |
786 | const unsigned char *pformats, *pcurves; | |
787 | size_t num_formats, num_curves, i; | |
788 | int j; | |
789 | /* | |
790 | * If point formats extension present check it, otherwise everything is | |
791 | * supported (see RFC4492). | |
792 | */ | |
793 | if (comp_id && s->session->tlsext_ecpointformatlist) { | |
794 | pformats = s->session->tlsext_ecpointformatlist; | |
795 | num_formats = s->session->tlsext_ecpointformatlist_length; | |
796 | for (i = 0; i < num_formats; i++, pformats++) { | |
797 | if (*comp_id == *pformats) | |
798 | break; | |
799 | } | |
800 | if (i == num_formats) | |
801 | return 0; | |
802 | } | |
803 | if (!curve_id) | |
804 | return 1; | |
805 | /* Check curve is consistent with client and server preferences */ | |
806 | for (j = 0; j <= 1; j++) { | |
807 | if (!tls1_get_curvelist(s, j, &pcurves, &num_curves)) | |
808 | return 0; | |
bd891f09 MC |
809 | if (j == 1 && num_curves == 0) { |
810 | /* | |
811 | * If we've not received any curves then skip this check. | |
812 | * RFC 4492 does not require the supported elliptic curves extension | |
813 | * so if it is not sent we can just choose any curve. | |
814 | * It is invalid to send an empty list in the elliptic curves | |
815 | * extension, so num_curves == 0 always means no extension. | |
816 | */ | |
817 | break; | |
818 | } | |
ae5c8664 MC |
819 | for (i = 0; i < num_curves; i++, pcurves += 2) { |
820 | if (pcurves[0] == curve_id[0] && pcurves[1] == curve_id[1]) | |
821 | break; | |
822 | } | |
823 | if (i == num_curves) | |
824 | return 0; | |
825 | /* For clients can only check sent curve list */ | |
826 | if (!s->server) | |
827 | return 1; | |
828 | } | |
829 | return 1; | |
830 | } | |
484f8762 | 831 | |
684a2264 | 832 | static void tls1_get_formatlist(SSL *s, const unsigned char **pformats, |
ae5c8664 MC |
833 | size_t *num_formats) |
834 | { | |
835 | /* | |
836 | * If we have a custom point format list use it otherwise use default | |
837 | */ | |
838 | if (s->tlsext_ecpointformatlist) { | |
839 | *pformats = s->tlsext_ecpointformatlist; | |
840 | *num_formats = s->tlsext_ecpointformatlist_length; | |
841 | } else { | |
842 | *pformats = ecformats_default; | |
843 | /* For Suite B we don't support char2 fields */ | |
844 | if (tls1_suiteb(s)) | |
845 | *num_formats = sizeof(ecformats_default) - 1; | |
846 | else | |
847 | *num_formats = sizeof(ecformats_default); | |
848 | } | |
849 | } | |
850 | ||
851 | /* | |
852 | * Check cert parameters compatible with extensions: currently just checks EC | |
853 | * certificates have compatible curves and compression. | |
484f8762 | 854 | */ |
ccf6a19e | 855 | static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md) |
ae5c8664 MC |
856 | { |
857 | unsigned char comp_id, curve_id[2]; | |
858 | EVP_PKEY *pkey; | |
859 | int rv; | |
860 | pkey = X509_get_pubkey(x); | |
861 | if (!pkey) | |
862 | return 0; | |
863 | /* If not EC nothing to do */ | |
864 | if (pkey->type != EVP_PKEY_EC) { | |
865 | EVP_PKEY_free(pkey); | |
866 | return 1; | |
867 | } | |
868 | rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec); | |
869 | EVP_PKEY_free(pkey); | |
870 | if (!rv) | |
871 | return 0; | |
872 | /* | |
873 | * Can't check curve_id for client certs as we don't have a supported | |
874 | * curves extension. | |
875 | */ | |
876 | rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id); | |
877 | if (!rv) | |
878 | return 0; | |
879 | /* | |
880 | * Special case for suite B. We *MUST* sign using SHA256+P-256 or | |
881 | * SHA384+P-384, adjust digest if necessary. | |
882 | */ | |
883 | if (set_ee_md && tls1_suiteb(s)) { | |
884 | int check_md; | |
885 | size_t i; | |
886 | CERT *c = s->cert; | |
887 | if (curve_id[0]) | |
888 | return 0; | |
889 | /* Check to see we have necessary signing algorithm */ | |
890 | if (curve_id[1] == TLSEXT_curve_P_256) | |
891 | check_md = NID_ecdsa_with_SHA256; | |
892 | else if (curve_id[1] == TLSEXT_curve_P_384) | |
893 | check_md = NID_ecdsa_with_SHA384; | |
894 | else | |
895 | return 0; /* Should never happen */ | |
896 | for (i = 0; i < c->shared_sigalgslen; i++) | |
897 | if (check_md == c->shared_sigalgs[i].signandhash_nid) | |
898 | break; | |
899 | if (i == c->shared_sigalgslen) | |
900 | return 0; | |
901 | if (set_ee_md == 2) { | |
902 | if (check_md == NID_ecdsa_with_SHA256) | |
903 | c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256(); | |
904 | else | |
905 | c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384(); | |
906 | } | |
907 | } | |
908 | return rv; | |
909 | } | |
910 | ||
911 | # ifndef OPENSSL_NO_ECDH | |
c132ca95 | 912 | /* Check EC temporary key is compatible with client extensions */ |
ccf6a19e | 913 | int tls1_check_ec_tmp_key(SSL *s, unsigned long cid) |
ae5c8664 MC |
914 | { |
915 | unsigned char curve_id[2]; | |
916 | EC_KEY *ec = s->cert->ecdh_tmp; | |
917 | # ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL | |
918 | /* Allow any curve: not just those peer supports */ | |
919 | if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL) | |
920 | return 1; | |
921 | # endif | |
922 | /* | |
923 | * If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384, no other | |
924 | * curves permitted. | |
925 | */ | |
926 | if (tls1_suiteb(s)) { | |
927 | /* Curve to check determined by ciphersuite */ | |
928 | if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) | |
929 | curve_id[1] = TLSEXT_curve_P_256; | |
930 | else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384) | |
931 | curve_id[1] = TLSEXT_curve_P_384; | |
932 | else | |
933 | return 0; | |
934 | curve_id[0] = 0; | |
935 | /* Check this curve is acceptable */ | |
936 | if (!tls1_check_ec_key(s, curve_id, NULL)) | |
937 | return 0; | |
938 | /* If auto or setting curve from callback assume OK */ | |
939 | if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb) | |
940 | return 1; | |
941 | /* Otherwise check curve is acceptable */ | |
942 | else { | |
943 | unsigned char curve_tmp[2]; | |
944 | if (!ec) | |
945 | return 0; | |
946 | if (!tls1_set_ec_id(curve_tmp, NULL, ec)) | |
947 | return 0; | |
948 | if (!curve_tmp[0] || curve_tmp[1] == curve_id[1]) | |
949 | return 1; | |
950 | return 0; | |
951 | } | |
952 | ||
953 | } | |
954 | if (s->cert->ecdh_tmp_auto) { | |
955 | /* Need a shared curve */ | |
956 | if (tls1_shared_curve(s, 0)) | |
957 | return 1; | |
958 | else | |
959 | return 0; | |
960 | } | |
961 | if (!ec) { | |
962 | if (s->cert->ecdh_tmp_cb) | |
963 | return 1; | |
964 | else | |
965 | return 0; | |
966 | } | |
967 | if (!tls1_set_ec_id(curve_id, NULL, ec)) | |
968 | return 0; | |
44adfeb6 | 969 | /* Set this to allow use of invalid curves for testing */ |
ae5c8664 MC |
970 | # if 0 |
971 | return 1; | |
972 | # else | |
973 | return tls1_check_ec_key(s, curve_id, NULL); | |
974 | # endif | |
975 | } | |
976 | # endif /* OPENSSL_NO_ECDH */ | |
6b870763 | 977 | |
5b430cfc DSH |
978 | #else |
979 | ||
980 | static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md) | |
ae5c8664 MC |
981 | { |
982 | return 1; | |
983 | } | |
5b430cfc | 984 | |
ae5c8664 | 985 | #endif /* OPENSSL_NO_EC */ |
f1fd4544 | 986 | |
ed3883d2 | 987 | #ifndef OPENSSL_NO_TLSEXT |
b81fde02 | 988 | |
ae5c8664 MC |
989 | /* |
990 | * List of supported signature algorithms and hashes. Should make this | |
4dde4708 DSH |
991 | * customisable at some point, for now include everything we support. |
992 | */ | |
993 | ||
ae5c8664 MC |
994 | # ifdef OPENSSL_NO_RSA |
995 | # define tlsext_sigalg_rsa(md) /* */ | |
996 | # else | |
997 | # define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa, | |
998 | # endif | |
999 | ||
1000 | # ifdef OPENSSL_NO_DSA | |
1001 | # define tlsext_sigalg_dsa(md) /* */ | |
1002 | # else | |
1003 | # define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa, | |
1004 | # endif | |
1005 | ||
1006 | # ifdef OPENSSL_NO_ECDSA | |
1007 | # define tlsext_sigalg_ecdsa(md) | |
1008 | /* */ | |
1009 | # else | |
1010 | # define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa, | |
1011 | # endif | |
1012 | ||
1013 | # define tlsext_sigalg(md) \ | |
1014 | tlsext_sigalg_rsa(md) \ | |
1015 | tlsext_sigalg_dsa(md) \ | |
1016 | tlsext_sigalg_ecdsa(md) | |
4dde4708 DSH |
1017 | |
1018 | static unsigned char tls12_sigalgs[] = { | |
ae5c8664 MC |
1019 | # ifndef OPENSSL_NO_SHA512 |
1020 | tlsext_sigalg(TLSEXT_hash_sha512) | |
1021 | tlsext_sigalg(TLSEXT_hash_sha384) | |
1022 | # endif | |
1023 | # ifndef OPENSSL_NO_SHA256 | |
1024 | tlsext_sigalg(TLSEXT_hash_sha256) | |
1025 | tlsext_sigalg(TLSEXT_hash_sha224) | |
1026 | # endif | |
1027 | # ifndef OPENSSL_NO_SHA | |
1028 | tlsext_sigalg(TLSEXT_hash_sha1) | |
1029 | # endif | |
4dde4708 | 1030 | }; |
ae5c8664 MC |
1031 | |
1032 | # ifndef OPENSSL_NO_ECDSA | |
ccf6a19e | 1033 | static unsigned char suiteb_sigalgs[] = { |
ae5c8664 MC |
1034 | tlsext_sigalg_ecdsa(TLSEXT_hash_sha256) |
1035 | tlsext_sigalg_ecdsa(TLSEXT_hash_sha384) | |
ccf6a19e | 1036 | }; |
ae5c8664 | 1037 | # endif |
e93f7d9c | 1038 | size_t tls12_get_psigalgs(SSL *s, int sent, const unsigned char **psigs) |
ae5c8664 MC |
1039 | { |
1040 | /* | |
1041 | * If Suite B mode use Suite B sigalgs only, ignore any other | |
1042 | * preferences. | |
1043 | */ | |
1044 | # ifndef OPENSSL_NO_EC | |
1045 | switch (tls1_suiteb(s)) { | |
1046 | case SSL_CERT_FLAG_SUITEB_128_LOS: | |
1047 | *psigs = suiteb_sigalgs; | |
1048 | return sizeof(suiteb_sigalgs); | |
1049 | ||
1050 | case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY: | |
1051 | *psigs = suiteb_sigalgs; | |
1052 | return 2; | |
1053 | ||
1054 | case SSL_CERT_FLAG_SUITEB_192_LOS: | |
1055 | *psigs = suiteb_sigalgs + 2; | |
1056 | return 2; | |
1057 | } | |
1058 | # endif | |
1059 | /* If server use client authentication sigalgs if not NULL */ | |
e93f7d9c | 1060 | if (s->server == sent && s->cert->client_sigalgs) { |
ae5c8664 MC |
1061 | *psigs = s->cert->client_sigalgs; |
1062 | return s->cert->client_sigalgslen; | |
1063 | } else if (s->cert->conf_sigalgs) { | |
1064 | *psigs = s->cert->conf_sigalgs; | |
1065 | return s->cert->conf_sigalgslen; | |
1066 | } else { | |
1067 | *psigs = tls12_sigalgs; | |
1068 | return sizeof(tls12_sigalgs); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Check signature algorithm is consistent with sent supported signature | |
25d4c925 DSH |
1074 | * algorithms and if so return relevant digest. |
1075 | */ | |
1076 | int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s, | |
ae5c8664 MC |
1077 | const unsigned char *sig, EVP_PKEY *pkey) |
1078 | { | |
1079 | const unsigned char *sent_sigs; | |
1080 | size_t sent_sigslen, i; | |
1081 | int sigalg = tls12_get_sigid(pkey); | |
1082 | /* Should never happen */ | |
1083 | if (sigalg == -1) | |
1084 | return -1; | |
1085 | /* Check key type is consistent with signature */ | |
1086 | if (sigalg != (int)sig[1]) { | |
1087 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE); | |
1088 | return 0; | |
1089 | } | |
1090 | # ifndef OPENSSL_NO_EC | |
1091 | if (pkey->type == EVP_PKEY_EC) { | |
1092 | unsigned char curve_id[2], comp_id; | |
1093 | /* Check compression and curve matches extensions */ | |
1094 | if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec)) | |
1095 | return 0; | |
1096 | if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id)) { | |
1097 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_CURVE); | |
1098 | return 0; | |
1099 | } | |
1100 | /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */ | |
1101 | if (tls1_suiteb(s)) { | |
1102 | if (curve_id[0]) | |
1103 | return 0; | |
1104 | if (curve_id[1] == TLSEXT_curve_P_256) { | |
1105 | if (sig[0] != TLSEXT_hash_sha256) { | |
1106 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, | |
1107 | SSL_R_ILLEGAL_SUITEB_DIGEST); | |
1108 | return 0; | |
1109 | } | |
1110 | } else if (curve_id[1] == TLSEXT_curve_P_384) { | |
1111 | if (sig[0] != TLSEXT_hash_sha384) { | |
1112 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, | |
1113 | SSL_R_ILLEGAL_SUITEB_DIGEST); | |
1114 | return 0; | |
1115 | } | |
1116 | } else | |
1117 | return 0; | |
1118 | } | |
1119 | } else if (tls1_suiteb(s)) | |
1120 | return 0; | |
1121 | # endif | |
1122 | ||
1123 | /* Check signature matches a type we sent */ | |
e93f7d9c | 1124 | sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs); |
ae5c8664 MC |
1125 | for (i = 0; i < sent_sigslen; i += 2, sent_sigs += 2) { |
1126 | if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1]) | |
1127 | break; | |
1128 | } | |
1129 | /* Allow fallback to SHA1 if not strict mode */ | |
1130 | if (i == sent_sigslen | |
1131 | && (sig[0] != TLSEXT_hash_sha1 | |
1132 | || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) { | |
1133 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_WRONG_SIGNATURE_TYPE); | |
1134 | return 0; | |
1135 | } | |
1136 | *pmd = tls12_get_hash(sig[0]); | |
1137 | if (*pmd == NULL) { | |
1138 | SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG, SSL_R_UNKNOWN_DIGEST); | |
1139 | return 0; | |
1140 | } | |
1141 | /* | |
1142 | * Store the digest used so applications can retrieve it if they wish. | |
1143 | */ | |
1144 | if (s->session && s->session->sess_cert) | |
1145 | s->session->sess_cert->peer_key->digest = *pmd; | |
1146 | return 1; | |
1147 | } | |
ccf6a19e | 1148 | |
ae5c8664 MC |
1149 | /* |
1150 | * Get a mask of disabled algorithms: an algorithm is disabled if it isn't | |
1151 | * supported or doesn't appear in supported signature algorithms. Unlike | |
1152 | * ssl_cipher_get_disabled this applies to a specific session and not global | |
1153 | * settings. | |
b28fbdfa DSH |
1154 | */ |
1155 | void ssl_set_client_disabled(SSL *s) | |
ae5c8664 MC |
1156 | { |
1157 | CERT *c = s->cert; | |
1158 | const unsigned char *sigalgs; | |
1159 | size_t i, sigalgslen; | |
1160 | int have_rsa = 0, have_dsa = 0, have_ecdsa = 0; | |
1161 | c->mask_a = 0; | |
1162 | c->mask_k = 0; | |
1163 | /* Don't allow TLS 1.2 only ciphers if we don't suppport them */ | |
1164 | if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s)) | |
1165 | c->mask_ssl = SSL_TLSV1_2; | |
1166 | else | |
1167 | c->mask_ssl = 0; | |
1168 | /* | |
1169 | * Now go through all signature algorithms seeing if we support any for | |
1170 | * RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. | |
1171 | */ | |
e93f7d9c | 1172 | sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs); |
ae5c8664 MC |
1173 | for (i = 0; i < sigalgslen; i += 2, sigalgs += 2) { |
1174 | switch (sigalgs[1]) { | |
1175 | # ifndef OPENSSL_NO_RSA | |
1176 | case TLSEXT_signature_rsa: | |
1177 | have_rsa = 1; | |
1178 | break; | |
1179 | # endif | |
1180 | # ifndef OPENSSL_NO_DSA | |
1181 | case TLSEXT_signature_dsa: | |
1182 | have_dsa = 1; | |
1183 | break; | |
1184 | # endif | |
1185 | # ifndef OPENSSL_NO_ECDSA | |
1186 | case TLSEXT_signature_ecdsa: | |
1187 | have_ecdsa = 1; | |
1188 | break; | |
1189 | # endif | |
1190 | } | |
1191 | } | |
1192 | /* | |
1193 | * Disable auth and static DH if we don't include any appropriate | |
1194 | * signature algorithms. | |
1195 | */ | |
1196 | if (!have_rsa) { | |
1197 | c->mask_a |= SSL_aRSA; | |
1198 | c->mask_k |= SSL_kDHr | SSL_kECDHr; | |
1199 | } | |
1200 | if (!have_dsa) { | |
1201 | c->mask_a |= SSL_aDSS; | |
1202 | c->mask_k |= SSL_kDHd; | |
1203 | } | |
1204 | if (!have_ecdsa) { | |
1205 | c->mask_a |= SSL_aECDSA; | |
1206 | c->mask_k |= SSL_kECDHe; | |
1207 | } | |
1208 | # ifndef OPENSSL_NO_KRB5 | |
1209 | if (!kssl_tgt_is_available(s->kssl_ctx)) { | |
1210 | c->mask_a |= SSL_aKRB5; | |
1211 | c->mask_k |= SSL_kKRB5; | |
1212 | } | |
1213 | # endif | |
1214 | # ifndef OPENSSL_NO_PSK | |
1215 | /* with PSK there must be client callback set */ | |
1216 | if (!s->psk_client_callback) { | |
1217 | c->mask_a |= SSL_aPSK; | |
1218 | c->mask_k |= SSL_kPSK; | |
1219 | } | |
1220 | # endif /* OPENSSL_NO_PSK */ | |
1221 | # ifndef OPENSSL_NO_SRP | |
1222 | if (!(s->srp_ctx.srp_Mask & SSL_kSRP)) { | |
1223 | c->mask_a |= SSL_aSRP; | |
1224 | c->mask_k |= SSL_kSRP; | |
1225 | } | |
1226 | # endif | |
1227 | c->valid = 1; | |
1228 | } | |
ed3883d2 | 1229 | |
ae5c8664 MC |
1230 | unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf, |
1231 | unsigned char *limit, int *al) | |
1232 | { | |
1233 | int extdatalen = 0; | |
1234 | unsigned char *orig = buf; | |
1235 | unsigned char *ret = buf; | |
1236 | # ifndef OPENSSL_NO_EC | |
1237 | /* See if we support any ECC ciphersuites */ | |
1238 | int using_ecc = 0; | |
1239 | if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s)) { | |
1240 | int i; | |
1241 | unsigned long alg_k, alg_a; | |
1242 | STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); | |
1243 | ||
1244 | for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) { | |
1245 | SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); | |
1246 | ||
1247 | alg_k = c->algorithm_mkey; | |
1248 | alg_a = c->algorithm_auth; | |
1249 | if ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe) | |
1250 | || (alg_a & SSL_aECDSA))) { | |
1251 | using_ecc = 1; | |
1252 | break; | |
1253 | } | |
1254 | } | |
1255 | } | |
1256 | # endif | |
1257 | ||
1258 | /* don't add extensions for SSLv3 unless doing secure renegotiation */ | |
1259 | if (s->client_version == SSL3_VERSION && !s->s3->send_connection_binding) | |
1260 | return orig; | |
1261 | ||
1262 | ret += 2; | |
1263 | ||
1264 | if (ret >= limit) | |
1265 | return NULL; /* this really never occurs, but ... */ | |
1266 | ||
1267 | if (s->tlsext_hostname != NULL) { | |
1268 | /* Add TLS extension servername to the Client Hello message */ | |
a520723f | 1269 | size_t size_str; |
ae5c8664 | 1270 | |
83975c80 MC |
1271 | /*- |
1272 | * check for enough space. | |
1273 | * 4 for the servername type and entension length | |
1274 | * 2 for servernamelist length | |
1275 | * 1 for the hostname type | |
1276 | * 2 for hostname length | |
1277 | * + hostname length | |
1278 | */ | |
a520723f | 1279 | size_str = strlen(s->tlsext_hostname); |
0b9c5da0 | 1280 | if (CHECKLEN(ret, 9 + size_str, limit)) |
ae5c8664 MC |
1281 | return NULL; |
1282 | ||
1283 | /* extension type and length */ | |
1284 | s2n(TLSEXT_TYPE_server_name, ret); | |
1285 | s2n(size_str + 5, ret); | |
1286 | ||
1287 | /* length of servername list */ | |
1288 | s2n(size_str + 3, ret); | |
1289 | ||
1290 | /* hostname type, length and hostname */ | |
1291 | *(ret++) = (unsigned char)TLSEXT_NAMETYPE_host_name; | |
1292 | s2n(size_str, ret); | |
1293 | memcpy(ret, s->tlsext_hostname, size_str); | |
1294 | ret += size_str; | |
1295 | } | |
1296 | ||
1297 | /* Add RI if renegotiating */ | |
1298 | if (s->renegotiate) { | |
1299 | int el; | |
1300 | ||
1301 | if (!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) { | |
1302 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1303 | return NULL; | |
73582b81 DSH |
1304 | } |
1305 | ||
ae5c8664 MC |
1306 | if ((limit - ret - 4 - el) < 0) |
1307 | return NULL; | |
a149b246 | 1308 | |
ae5c8664 MC |
1309 | s2n(TLSEXT_TYPE_renegotiate, ret); |
1310 | s2n(el, ret); | |
761772d7 | 1311 | |
ae5c8664 MC |
1312 | if (!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) { |
1313 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1314 | return NULL; | |
1315 | } | |
bd6941cf | 1316 | |
ae5c8664 MC |
1317 | ret += el; |
1318 | } | |
1319 | # ifndef OPENSSL_NO_SRP | |
1320 | /* Add SRP username if there is one */ | |
1321 | if (s->srp_ctx.login != NULL) { /* Add TLS extension SRP username to the | |
1322 | * Client Hello message */ | |
1323 | ||
a520723f | 1324 | size_t login_len = strlen(s->srp_ctx.login); |
ae5c8664 MC |
1325 | if (login_len > 255 || login_len == 0) { |
1326 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1327 | return NULL; | |
1328 | } | |
68b33cc5 | 1329 | |
83975c80 MC |
1330 | /*- |
1331 | * check for enough space. | |
1332 | * 4 for the srp type type and entension length | |
1333 | * 1 for the srp user identity | |
1334 | * + srp user identity length | |
1335 | */ | |
0b9c5da0 | 1336 | if (CHECKLEN(ret, 5 + login_len, limit)) |
ae5c8664 MC |
1337 | return NULL; |
1338 | ||
1339 | /* fill in the extension */ | |
1340 | s2n(TLSEXT_TYPE_srp, ret); | |
1341 | s2n(login_len + 1, ret); | |
1342 | (*ret++) = (unsigned char)login_len; | |
1343 | memcpy(ret, s->srp_ctx.login, login_len); | |
1344 | ret += login_len; | |
1345 | } | |
1346 | # endif | |
1347 | ||
1348 | # ifndef OPENSSL_NO_EC | |
1349 | if (using_ecc) { | |
1350 | /* | |
1351 | * Add TLS extension ECPointFormats to the ClientHello message | |
1352 | */ | |
ae5c8664 MC |
1353 | const unsigned char *pcurves, *pformats; |
1354 | size_t num_curves, num_formats, curves_list_len; | |
1355 | ||
1356 | tls1_get_formatlist(s, &pformats, &num_formats); | |
1357 | ||
ae5c8664 MC |
1358 | if (num_formats > 255) { |
1359 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1360 | return NULL; | |
73582b81 | 1361 | } |
a520723f MC |
1362 | /*- |
1363 | * check for enough space. | |
1364 | * 4 bytes for the ec point formats type and extension length | |
1365 | * 1 byte for the length of the formats | |
1366 | * + formats length | |
1367 | */ | |
0b9c5da0 | 1368 | if (CHECKLEN(ret, 5 + num_formats, limit)) |
a520723f | 1369 | return NULL; |
73582b81 | 1370 | |
ae5c8664 MC |
1371 | s2n(TLSEXT_TYPE_ec_point_formats, ret); |
1372 | /* The point format list has 1-byte length. */ | |
1373 | s2n(num_formats + 1, ret); | |
1374 | *(ret++) = (unsigned char)num_formats; | |
1375 | memcpy(ret, pformats, num_formats); | |
1376 | ret += num_formats; | |
1377 | ||
1378 | /* | |
1379 | * Add TLS extension EllipticCurves to the ClientHello message | |
1380 | */ | |
1381 | pcurves = s->tlsext_ellipticcurvelist; | |
1382 | if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) | |
1383 | return NULL; | |
1384 | ||
ae5c8664 MC |
1385 | if (num_curves > 65532 / 2) { |
1386 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1387 | return NULL; | |
1388 | } | |
1389 | curves_list_len = 2 * num_curves; | |
a520723f MC |
1390 | /*- |
1391 | * check for enough space. | |
1392 | * 4 bytes for the ec curves type and extension length | |
1393 | * 2 bytes for the curve list length | |
1394 | * + curve list length | |
1395 | */ | |
0b9c5da0 | 1396 | if (CHECKLEN(ret, 6 + curves_list_len, limit)) |
a520723f MC |
1397 | return NULL; |
1398 | ||
ae5c8664 MC |
1399 | s2n(TLSEXT_TYPE_elliptic_curves, ret); |
1400 | s2n(curves_list_len + 2, ret); | |
1401 | s2n(curves_list_len, ret); | |
1402 | memcpy(ret, pcurves, curves_list_len); | |
1403 | ret += curves_list_len; | |
1404 | } | |
1405 | # endif /* OPENSSL_NO_EC */ | |
1406 | ||
1407 | if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) { | |
a520723f | 1408 | size_t ticklen; |
ae5c8664 MC |
1409 | if (!s->new_session && s->session && s->session->tlsext_tick) |
1410 | ticklen = s->session->tlsext_ticklen; | |
1411 | else if (s->session && s->tlsext_session_ticket && | |
1412 | s->tlsext_session_ticket->data) { | |
1413 | ticklen = s->tlsext_session_ticket->length; | |
1414 | s->session->tlsext_tick = OPENSSL_malloc(ticklen); | |
1415 | if (!s->session->tlsext_tick) | |
1416 | return NULL; | |
1417 | memcpy(s->session->tlsext_tick, | |
1418 | s->tlsext_session_ticket->data, ticklen); | |
1419 | s->session->tlsext_ticklen = ticklen; | |
1420 | } else | |
1421 | ticklen = 0; | |
1422 | if (ticklen == 0 && s->tlsext_session_ticket && | |
1423 | s->tlsext_session_ticket->data == NULL) | |
1424 | goto skip_ext; | |
1425 | /* | |
1426 | * Check for enough room 2 for extension type, 2 for len rest for | |
1427 | * ticket | |
1428 | */ | |
0b9c5da0 | 1429 | if (CHECKLEN(ret, 4 + ticklen, limit)) |
ae5c8664 MC |
1430 | return NULL; |
1431 | s2n(TLSEXT_TYPE_session_ticket, ret); | |
1432 | s2n(ticklen, ret); | |
a520723f | 1433 | if (ticklen > 0) { |
ae5c8664 MC |
1434 | memcpy(ret, s->session->tlsext_tick, ticklen); |
1435 | ret += ticklen; | |
1436 | } | |
1437 | } | |
1438 | skip_ext: | |
1439 | ||
b8943a51 | 1440 | if (SSL_CLIENT_USE_SIGALGS(s)) { |
ae5c8664 MC |
1441 | size_t salglen; |
1442 | const unsigned char *salg; | |
e93f7d9c | 1443 | salglen = tls12_get_psigalgs(s, 1, &salg); |
a520723f MC |
1444 | |
1445 | /*- | |
1446 | * check for enough space. | |
1447 | * 4 bytes for the sigalgs type and extension length | |
1448 | * 2 bytes for the sigalg list length | |
1449 | * + sigalg list length | |
1450 | */ | |
0b9c5da0 | 1451 | if (CHECKLEN(ret, salglen + 6, limit)) |
ae5c8664 MC |
1452 | return NULL; |
1453 | s2n(TLSEXT_TYPE_signature_algorithms, ret); | |
1454 | s2n(salglen + 2, ret); | |
1455 | s2n(salglen, ret); | |
1456 | memcpy(ret, salg, salglen); | |
1457 | ret += salglen; | |
1458 | } | |
1459 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
1460 | if (s->s3->client_opaque_prf_input != NULL) { | |
1461 | size_t col = s->s3->client_opaque_prf_input_len; | |
1462 | ||
1463 | if ((long)(limit - ret - 6 - col < 0)) | |
1464 | return NULL; | |
1465 | if (col > 0xFFFD) /* can't happen */ | |
1466 | return NULL; | |
1467 | ||
1468 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
1469 | s2n(col + 2, ret); | |
1470 | s2n(col, ret); | |
1471 | memcpy(ret, s->s3->client_opaque_prf_input, col); | |
1472 | ret += col; | |
1473 | } | |
1474 | # endif | |
1475 | ||
1476 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) { | |
1477 | int i; | |
a520723f MC |
1478 | size_t extlen, idlen; |
1479 | int lentmp; | |
ae5c8664 MC |
1480 | OCSP_RESPID *id; |
1481 | ||
1482 | idlen = 0; | |
1483 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) { | |
1484 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
a520723f MC |
1485 | lentmp = i2d_OCSP_RESPID(id, NULL); |
1486 | if (lentmp <= 0) | |
ae5c8664 | 1487 | return NULL; |
a520723f | 1488 | idlen += (size_t)lentmp + 2; |
ae5c8664 | 1489 | } |
060a38a2 | 1490 | |
ae5c8664 | 1491 | if (s->tlsext_ocsp_exts) { |
a520723f MC |
1492 | lentmp = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); |
1493 | if (lentmp < 0) | |
ae5c8664 | 1494 | return NULL; |
a520723f | 1495 | extlen = (size_t)lentmp; |
ae5c8664 MC |
1496 | } else |
1497 | extlen = 0; | |
1498 | ||
a520723f MC |
1499 | if (extlen + idlen > 0xFFF0) |
1500 | return NULL; | |
83a1d4b2 MC |
1501 | /* |
1502 | * 2 bytes for status request type | |
1503 | * 2 bytes for status request len | |
1504 | * 1 byte for OCSP request type | |
1505 | * 2 bytes for length of ids | |
1506 | * 2 bytes for length of extensions | |
0b9c5da0 MC |
1507 | * + length of ids |
1508 | * + length of extensions | |
83a1d4b2 | 1509 | */ |
0b9c5da0 | 1510 | if (CHECKLEN(ret, 9 + idlen + extlen, limit)) |
ae5c8664 | 1511 | return NULL; |
a520723f | 1512 | |
ae5c8664 | 1513 | s2n(TLSEXT_TYPE_status_request, ret); |
ae5c8664 MC |
1514 | s2n(extlen + idlen + 5, ret); |
1515 | *(ret++) = TLSEXT_STATUSTYPE_ocsp; | |
1516 | s2n(idlen, ret); | |
1517 | for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) { | |
1518 | /* save position of id len */ | |
1519 | unsigned char *q = ret; | |
1520 | id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); | |
1521 | /* skip over id len */ | |
1522 | ret += 2; | |
a520723f | 1523 | lentmp = i2d_OCSP_RESPID(id, &ret); |
ae5c8664 | 1524 | /* write id len */ |
a520723f | 1525 | s2n(lentmp, q); |
ae5c8664 MC |
1526 | } |
1527 | s2n(extlen, ret); | |
1528 | if (extlen > 0) | |
1529 | i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); | |
1530 | } | |
1531 | # ifndef OPENSSL_NO_HEARTBEATS | |
1532 | /* Add Heartbeat extension */ | |
a520723f MC |
1533 | |
1534 | /*- | |
1535 | * check for enough space. | |
1536 | * 4 bytes for the heartbeat ext type and extension length | |
1537 | * 1 byte for the mode | |
1538 | */ | |
0b9c5da0 | 1539 | if (CHECKLEN(ret, 5, limit)) |
ae5c8664 | 1540 | return NULL; |
a520723f | 1541 | |
ae5c8664 MC |
1542 | s2n(TLSEXT_TYPE_heartbeat, ret); |
1543 | s2n(1, ret); | |
83975c80 MC |
1544 | /*- |
1545 | * Set mode: | |
1546 | * 1: peer may send requests | |
1547 | * 2: peer not allowed to send requests | |
1548 | */ | |
ae5c8664 MC |
1549 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) |
1550 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1551 | else | |
1552 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
1553 | # endif | |
1554 | ||
1555 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
1556 | if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) { | |
1557 | /* | |
1558 | * The client advertises an emtpy extension to indicate its support | |
1559 | * for Next Protocol Negotiation | |
1560 | */ | |
a520723f MC |
1561 | |
1562 | /*- | |
1563 | * check for enough space. | |
1564 | * 4 bytes for the NPN ext type and extension length | |
1565 | */ | |
0b9c5da0 | 1566 | if (CHECKLEN(ret, 4, limit)) |
ae5c8664 MC |
1567 | return NULL; |
1568 | s2n(TLSEXT_TYPE_next_proto_neg, ret); | |
1569 | s2n(0, ret); | |
1570 | } | |
1571 | # endif | |
1572 | ||
1573 | if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len) { | |
a520723f MC |
1574 | /*- |
1575 | * check for enough space. | |
1576 | * 4 bytes for the ALPN type and extension length | |
1577 | * 2 bytes for the ALPN protocol list length | |
1578 | * + ALPN protocol list length | |
1579 | */ | |
0b9c5da0 | 1580 | if (CHECKLEN(ret, 6 + s->alpn_client_proto_list_len, limit)) |
ae5c8664 MC |
1581 | return NULL; |
1582 | s2n(TLSEXT_TYPE_application_layer_protocol_negotiation, ret); | |
1583 | s2n(2 + s->alpn_client_proto_list_len, ret); | |
1584 | s2n(s->alpn_client_proto_list_len, ret); | |
1585 | memcpy(ret, s->alpn_client_proto_list, s->alpn_client_proto_list_len); | |
1586 | ret += s->alpn_client_proto_list_len; | |
af2db04c | 1587 | s->cert->alpn_sent = 1; |
ae5c8664 MC |
1588 | } |
1589 | # ifndef OPENSSL_NO_SRTP | |
1590 | if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) { | |
1591 | int el; | |
1592 | ||
1593 | ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0); | |
1594 | ||
a520723f MC |
1595 | /*- |
1596 | * check for enough space. | |
1597 | * 4 bytes for the SRTP type and extension length | |
1598 | * + SRTP profiles length | |
1599 | */ | |
0b9c5da0 | 1600 | if (CHECKLEN(ret, 4 + el, limit)) |
ae5c8664 MC |
1601 | return NULL; |
1602 | ||
1603 | s2n(TLSEXT_TYPE_use_srtp, ret); | |
1604 | s2n(el, ret); | |
1605 | ||
1606 | if (ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) { | |
1607 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1608 | return NULL; | |
1609 | } | |
1610 | ret += el; | |
1611 | } | |
1612 | # endif | |
1613 | custom_ext_init(&s->cert->cli_ext); | |
1614 | /* Add custom TLS Extensions to ClientHello */ | |
1615 | if (!custom_ext_add(s, 0, &ret, limit, al)) | |
1616 | return NULL; | |
1617 | ||
1618 | /* | |
1619 | * Add padding to workaround bugs in F5 terminators. See | |
1620 | * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this | |
1621 | * code works out the length of all existing extensions it MUST always | |
1622 | * appear last. | |
1623 | */ | |
1624 | if (s->options & SSL_OP_TLSEXT_PADDING) { | |
1625 | int hlen = ret - (unsigned char *)s->init_buf->data; | |
1626 | /* | |
1627 | * The code in s23_clnt.c to build ClientHello messages includes the | |
1628 | * 5-byte record header in the buffer, while the code in s3_clnt.c | |
1629 | * does not. | |
1630 | */ | |
1631 | if (s->state == SSL23_ST_CW_CLNT_HELLO_A) | |
1632 | hlen -= 5; | |
1633 | if (hlen > 0xff && hlen < 0x200) { | |
1634 | hlen = 0x200 - hlen; | |
1635 | if (hlen >= 4) | |
1636 | hlen -= 4; | |
1637 | else | |
1638 | hlen = 0; | |
1639 | ||
a520723f MC |
1640 | /*- |
1641 | * check for enough space. Strictly speaking we know we've already | |
1642 | * got enough space because to get here the message size is < 0x200, | |
1643 | * but we know that we've allocated far more than that in the buffer | |
1644 | * - but for consistency and robustness we're going to check anyway. | |
1645 | * | |
1646 | * 4 bytes for the padding type and extension length | |
1647 | * + padding length | |
1648 | */ | |
0b9c5da0 | 1649 | if (CHECKLEN(ret, 4 + hlen, limit)) |
a520723f | 1650 | return NULL; |
ae5c8664 MC |
1651 | s2n(TLSEXT_TYPE_padding, ret); |
1652 | s2n(hlen, ret); | |
1653 | memset(ret, 0, hlen); | |
1654 | ret += hlen; | |
1655 | } | |
1656 | } | |
060a38a2 | 1657 | |
ae5c8664 MC |
1658 | if ((extdatalen = ret - orig - 2) == 0) |
1659 | return orig; | |
060a38a2 | 1660 | |
ae5c8664 MC |
1661 | s2n(extdatalen, orig); |
1662 | return ret; | |
1663 | } | |
060a38a2 | 1664 | |
ae5c8664 MC |
1665 | unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, |
1666 | unsigned char *limit, int *al) | |
1667 | { | |
1668 | int extdatalen = 0; | |
1669 | unsigned char *orig = buf; | |
1670 | unsigned char *ret = buf; | |
1671 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
1672 | int next_proto_neg_seen; | |
1673 | # endif | |
1674 | # ifndef OPENSSL_NO_EC | |
1675 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
1676 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
1677 | int using_ecc = (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) | |
1678 | || (alg_a & SSL_aECDSA); | |
1679 | using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); | |
1680 | # endif | |
1681 | /* | |
1682 | * don't add extensions for SSLv3, unless doing secure renegotiation | |
1683 | */ | |
1684 | if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) | |
1685 | return orig; | |
1686 | ||
1687 | ret += 2; | |
1688 | if (ret >= limit) | |
1689 | return NULL; /* this really never occurs, but ... */ | |
1690 | ||
1691 | if (!s->hit && s->servername_done == 1 | |
1692 | && s->session->tlsext_hostname != NULL) { | |
1693 | if ((long)(limit - ret - 4) < 0) | |
1694 | return NULL; | |
1695 | ||
1696 | s2n(TLSEXT_TYPE_server_name, ret); | |
1697 | s2n(0, ret); | |
1698 | } | |
1699 | ||
1700 | if (s->s3->send_connection_binding) { | |
1701 | int el; | |
1702 | ||
1703 | if (!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) { | |
1704 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1705 | return NULL; | |
1706 | } | |
060a38a2 | 1707 | |
a520723f MC |
1708 | /*- |
1709 | * check for enough space. | |
1710 | * 4 bytes for the reneg type and extension length | |
1711 | * + reneg data length | |
1712 | */ | |
0b9c5da0 | 1713 | if (CHECKLEN(ret, 4 + el, limit)) |
ae5c8664 | 1714 | return NULL; |
bd6941cf | 1715 | |
ae5c8664 MC |
1716 | s2n(TLSEXT_TYPE_renegotiate, ret); |
1717 | s2n(el, ret); | |
ed3883d2 | 1718 | |
ae5c8664 MC |
1719 | if (!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) { |
1720 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1721 | return NULL; | |
1722 | } | |
1723 | ||
1724 | ret += el; | |
1725 | } | |
1726 | # ifndef OPENSSL_NO_EC | |
1727 | if (using_ecc) { | |
1728 | const unsigned char *plist; | |
1729 | size_t plistlen; | |
1730 | /* | |
1731 | * Add TLS extension ECPointFormats to the ServerHello message | |
1732 | */ | |
ae5c8664 MC |
1733 | |
1734 | tls1_get_formatlist(s, &plist, &plistlen); | |
1735 | ||
ae5c8664 MC |
1736 | if (plistlen > 255) { |
1737 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1738 | return NULL; | |
1739 | } | |
1740 | ||
a520723f MC |
1741 | /*- |
1742 | * check for enough space. | |
1743 | * 4 bytes for the ec points format type and extension length | |
1744 | * 1 byte for the points format list length | |
1745 | * + length of points format list | |
1746 | */ | |
0b9c5da0 | 1747 | if (CHECKLEN(ret, 5 + plistlen, limit)) |
a520723f MC |
1748 | return NULL; |
1749 | ||
ae5c8664 MC |
1750 | s2n(TLSEXT_TYPE_ec_point_formats, ret); |
1751 | s2n(plistlen + 1, ret); | |
1752 | *(ret++) = (unsigned char)plistlen; | |
1753 | memcpy(ret, plist, plistlen); | |
1754 | ret += plistlen; | |
1755 | ||
1756 | } | |
1757 | /* | |
1758 | * Currently the server should not respond with a SupportedCurves | |
1759 | * extension | |
1760 | */ | |
1761 | # endif /* OPENSSL_NO_EC */ | |
1762 | ||
1763 | if (s->tlsext_ticket_expected && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) { | |
a520723f MC |
1764 | /*- |
1765 | * check for enough space. | |
1766 | * 4 bytes for the Ticket type and extension length | |
1767 | */ | |
0b9c5da0 | 1768 | if (CHECKLEN(ret, 4, limit)) |
ae5c8664 MC |
1769 | return NULL; |
1770 | s2n(TLSEXT_TYPE_session_ticket, ret); | |
1771 | s2n(0, ret); | |
dbdb9661 TS |
1772 | } else { |
1773 | /* if we don't add the above TLSEXT, we can't add a session ticket later */ | |
1774 | s->tlsext_ticket_expected = 0; | |
ae5c8664 MC |
1775 | } |
1776 | ||
1777 | if (s->tlsext_status_expected) { | |
a520723f MC |
1778 | /*- |
1779 | * check for enough space. | |
1780 | * 4 bytes for the Status request type and extension length | |
1781 | */ | |
0b9c5da0 | 1782 | if (CHECKLEN(ret, 4, limit)) |
ae5c8664 MC |
1783 | return NULL; |
1784 | s2n(TLSEXT_TYPE_status_request, ret); | |
1785 | s2n(0, ret); | |
1786 | } | |
1787 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
1788 | if (s->s3->server_opaque_prf_input != NULL) { | |
1789 | size_t sol = s->s3->server_opaque_prf_input_len; | |
1790 | ||
1791 | if ((long)(limit - ret - 6 - sol) < 0) | |
1792 | return NULL; | |
1793 | if (sol > 0xFFFD) /* can't happen */ | |
1794 | return NULL; | |
1795 | ||
1796 | s2n(TLSEXT_TYPE_opaque_prf_input, ret); | |
1797 | s2n(sol + 2, ret); | |
1798 | s2n(sol, ret); | |
1799 | memcpy(ret, s->s3->server_opaque_prf_input, sol); | |
1800 | ret += sol; | |
1801 | } | |
1802 | # endif | |
1803 | ||
1804 | # ifndef OPENSSL_NO_SRTP | |
1805 | if (SSL_IS_DTLS(s) && s->srtp_profile) { | |
1806 | int el; | |
1807 | ||
1808 | ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0); | |
1809 | ||
a520723f MC |
1810 | /*- |
1811 | * check for enough space. | |
1812 | * 4 bytes for the SRTP profiles type and extension length | |
1813 | * + length of the SRTP profiles list | |
1814 | */ | |
0b9c5da0 | 1815 | if (CHECKLEN(ret, 4 + el, limit)) |
ae5c8664 MC |
1816 | return NULL; |
1817 | ||
1818 | s2n(TLSEXT_TYPE_use_srtp, ret); | |
1819 | s2n(el, ret); | |
1820 | ||
1821 | if (ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) { | |
1822 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); | |
1823 | return NULL; | |
1824 | } | |
1825 | ret += el; | |
1826 | } | |
1827 | # endif | |
1828 | ||
1829 | if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80 | |
1830 | || (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81) | |
1831 | && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) { | |
1832 | const unsigned char cryptopro_ext[36] = { | |
1833 | 0xfd, 0xe8, /* 65000 */ | |
1834 | 0x00, 0x20, /* 32 bytes length */ | |
1835 | 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, | |
1836 | 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, | |
1837 | 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, | |
1838 | 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17 | |
1839 | }; | |
a520723f MC |
1840 | |
1841 | /* check for enough space. */ | |
0b9c5da0 | 1842 | if (CHECKLEN(ret, sizeof(cryptopro_ext), limit)) |
ae5c8664 | 1843 | return NULL; |
a520723f MC |
1844 | memcpy(ret, cryptopro_ext, sizeof(cryptopro_ext)); |
1845 | ret += sizeof(cryptopro_ext); | |
ae5c8664 MC |
1846 | |
1847 | } | |
1848 | # ifndef OPENSSL_NO_HEARTBEATS | |
1849 | /* Add Heartbeat extension if we've received one */ | |
1850 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) { | |
a520723f MC |
1851 | /*- |
1852 | * check for enough space. | |
1853 | * 4 bytes for the Heartbeat type and extension length | |
1854 | * 1 byte for the mode | |
1855 | */ | |
0b9c5da0 | 1856 | if (CHECKLEN(ret, 5, limit)) |
ae5c8664 MC |
1857 | return NULL; |
1858 | s2n(TLSEXT_TYPE_heartbeat, ret); | |
1859 | s2n(1, ret); | |
83975c80 MC |
1860 | /*- |
1861 | * Set mode: | |
1862 | * 1: peer may send requests | |
1863 | * 2: peer not allowed to send requests | |
1864 | */ | |
ae5c8664 MC |
1865 | if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS) |
1866 | *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
1867 | else | |
1868 | *(ret++) = SSL_TLSEXT_HB_ENABLED; | |
1869 | ||
1870 | } | |
1871 | # endif | |
1872 | ||
1873 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
1874 | next_proto_neg_seen = s->s3->next_proto_neg_seen; | |
1875 | s->s3->next_proto_neg_seen = 0; | |
1876 | if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) { | |
1877 | const unsigned char *npa; | |
1878 | unsigned int npalen; | |
1879 | int r; | |
1880 | ||
1881 | r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, | |
1882 | s-> | |
1883 | ctx->next_protos_advertised_cb_arg); | |
1884 | if (r == SSL_TLSEXT_ERR_OK) { | |
a520723f MC |
1885 | /*- |
1886 | * check for enough space. | |
1887 | * 4 bytes for the NPN type and extension length | |
1888 | * + length of protocols list | |
1889 | */ | |
0b9c5da0 | 1890 | if (CHECKLEN(ret, 4 + npalen, limit)) |
ae5c8664 MC |
1891 | return NULL; |
1892 | s2n(TLSEXT_TYPE_next_proto_neg, ret); | |
1893 | s2n(npalen, ret); | |
1894 | memcpy(ret, npa, npalen); | |
1895 | ret += npalen; | |
1896 | s->s3->next_proto_neg_seen = 1; | |
1897 | } | |
1898 | } | |
1899 | # endif | |
1900 | if (!custom_ext_add(s, 1, &ret, limit, al)) | |
1901 | return NULL; | |
1902 | ||
1903 | if (s->s3->alpn_selected) { | |
1904 | const unsigned char *selected = s->s3->alpn_selected; | |
a520723f | 1905 | size_t len = s->s3->alpn_selected_len; |
ae5c8664 | 1906 | |
a520723f MC |
1907 | /*- |
1908 | * check for enough space. | |
1909 | * 4 bytes for the ALPN type and extension length | |
1910 | * 2 bytes for ALPN data length | |
1911 | * 1 byte for selected protocol length | |
1912 | * + length of the selected protocol | |
1913 | */ | |
0b9c5da0 | 1914 | if (CHECKLEN(ret, 7 + len, limit)) |
ae5c8664 MC |
1915 | return NULL; |
1916 | s2n(TLSEXT_TYPE_application_layer_protocol_negotiation, ret); | |
1917 | s2n(3 + len, ret); | |
1918 | s2n(1 + len, ret); | |
1bc5c3cc | 1919 | *ret++ = (unsigned char)len; |
ae5c8664 MC |
1920 | memcpy(ret, selected, len); |
1921 | ret += len; | |
1922 | } | |
1923 | ||
1924 | if ((extdatalen = ret - orig - 2) == 0) | |
1925 | return orig; | |
1926 | ||
1927 | s2n(extdatalen, orig); | |
1928 | return ret; | |
1929 | } | |
1930 | ||
1931 | # ifndef OPENSSL_NO_EC | |
6977c7e2 TH |
1932 | /*- |
1933 | * ssl_check_for_safari attempts to fingerprint Safari using OS X | |
07df5018 RS |
1934 | * SecureTransport using the TLS extension block in |d|, of length |n|. |
1935 | * Safari, since 10.6, sends exactly these extensions, in this order: | |
1936 | * SNI, | |
1937 | * elliptic_curves | |
1938 | * ec_point_formats | |
1939 | * | |
1940 | * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8, | |
1941 | * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them. | |
1942 | * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from | |
1943 | * 10.8..10.8.3 (which don't work). | |
1944 | */ | |
ae5c8664 | 1945 | static void ssl_check_for_safari(SSL *s, const unsigned char *data, |
61dfe3a7 | 1946 | const unsigned char *limit) |
ae5c8664 MC |
1947 | { |
1948 | unsigned short type, size; | |
1949 | static const unsigned char kSafariExtensionsBlock[] = { | |
1950 | 0x00, 0x0a, /* elliptic_curves extension */ | |
1951 | 0x00, 0x08, /* 8 bytes */ | |
1952 | 0x00, 0x06, /* 6 bytes of curve ids */ | |
1953 | 0x00, 0x17, /* P-256 */ | |
1954 | 0x00, 0x18, /* P-384 */ | |
1955 | 0x00, 0x19, /* P-521 */ | |
1956 | ||
1957 | 0x00, 0x0b, /* ec_point_formats */ | |
1958 | 0x00, 0x02, /* 2 bytes */ | |
1959 | 0x01, /* 1 point format */ | |
1960 | 0x00, /* uncompressed */ | |
1961 | }; | |
1962 | ||
1963 | /* The following is only present in TLS 1.2 */ | |
1964 | static const unsigned char kSafariTLS12ExtensionsBlock[] = { | |
1965 | 0x00, 0x0d, /* signature_algorithms */ | |
1966 | 0x00, 0x0c, /* 12 bytes */ | |
1967 | 0x00, 0x0a, /* 10 bytes */ | |
1968 | 0x05, 0x01, /* SHA-384/RSA */ | |
1969 | 0x04, 0x01, /* SHA-256/RSA */ | |
1970 | 0x02, 0x01, /* SHA-1/RSA */ | |
1971 | 0x04, 0x03, /* SHA-256/ECDSA */ | |
1972 | 0x02, 0x03, /* SHA-1/ECDSA */ | |
1973 | }; | |
1974 | ||
a004e72b | 1975 | if (limit - data <= 2) |
ae5c8664 MC |
1976 | return; |
1977 | data += 2; | |
1978 | ||
a004e72b | 1979 | if (limit - data < 4) |
ae5c8664 MC |
1980 | return; |
1981 | n2s(data, type); | |
1982 | n2s(data, size); | |
1983 | ||
1984 | if (type != TLSEXT_TYPE_server_name) | |
1985 | return; | |
1986 | ||
a004e72b | 1987 | if (limit - data < size) |
ae5c8664 MC |
1988 | return; |
1989 | data += size; | |
1990 | ||
1991 | if (TLS1_get_client_version(s) >= TLS1_2_VERSION) { | |
1992 | const size_t len1 = sizeof(kSafariExtensionsBlock); | |
1993 | const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock); | |
1994 | ||
a004e72b | 1995 | if (limit - data != (int)(len1 + len2)) |
ae5c8664 MC |
1996 | return; |
1997 | if (memcmp(data, kSafariExtensionsBlock, len1) != 0) | |
1998 | return; | |
1999 | if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0) | |
2000 | return; | |
2001 | } else { | |
2002 | const size_t len = sizeof(kSafariExtensionsBlock); | |
2003 | ||
a004e72b | 2004 | if (limit - data != (int)(len)) |
ae5c8664 MC |
2005 | return; |
2006 | if (memcmp(data, kSafariExtensionsBlock, len) != 0) | |
2007 | return; | |
2008 | } | |
2009 | ||
2010 | s->s3->is_probably_safari = 1; | |
07df5018 | 2011 | } |
ae5c8664 | 2012 | # endif /* !OPENSSL_NO_EC */ |
ed3883d2 | 2013 | |
ae5c8664 | 2014 | /* |
af2db04c | 2015 | * tls1_alpn_handle_client_hello is called to save the ALPN extension in a |
ae5c8664 MC |
2016 | * ClientHello. data: the contents of the extension, not including the type |
2017 | * and length. data_len: the number of bytes in |data| al: a pointer to the | |
2018 | * alert value to send in the event of a non-zero return. returns: 0 on | |
2019 | * success. | |
2020 | */ | |
2021 | static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data, | |
2022 | unsigned data_len, int *al) | |
2023 | { | |
2024 | unsigned i; | |
2025 | unsigned proto_len; | |
ae5c8664 MC |
2026 | |
2027 | if (data_len < 2) | |
2028 | goto parse_error; | |
2029 | ||
2030 | /* | |
2031 | * data should contain a uint16 length followed by a series of 8-bit, | |
2032 | * length-prefixed strings. | |
2033 | */ | |
2034 | i = ((unsigned)data[0]) << 8 | ((unsigned)data[1]); | |
2035 | data_len -= 2; | |
2036 | data += 2; | |
2037 | if (data_len != i) | |
2038 | goto parse_error; | |
2039 | ||
2040 | if (data_len < 2) | |
2041 | goto parse_error; | |
2042 | ||
2043 | for (i = 0; i < data_len;) { | |
2044 | proto_len = data[i]; | |
2045 | i++; | |
2046 | ||
2047 | if (proto_len == 0) | |
2048 | goto parse_error; | |
2049 | ||
2050 | if (i + proto_len < i || i + proto_len > data_len) | |
2051 | goto parse_error; | |
2052 | ||
2053 | i += proto_len; | |
2054 | } | |
2055 | ||
af2db04c TS |
2056 | if (s->cert->alpn_proposed != NULL) |
2057 | OPENSSL_free(s->cert->alpn_proposed); | |
2058 | s->cert->alpn_proposed = OPENSSL_malloc(data_len); | |
2059 | if (s->cert->alpn_proposed == NULL) { | |
2060 | *al = SSL_AD_INTERNAL_ERROR; | |
2061 | return -1; | |
ae5c8664 | 2062 | } |
af2db04c TS |
2063 | memcpy(s->cert->alpn_proposed, data, data_len); |
2064 | s->cert->alpn_proposed_len = data_len; | |
ae5c8664 MC |
2065 | return 0; |
2066 | ||
2067 | parse_error: | |
2068 | *al = SSL_AD_DECODE_ERROR; | |
2069 | return -1; | |
2070 | } | |
ed3883d2 | 2071 | |
af2db04c TS |
2072 | /* |
2073 | * Process the ALPN extension in a ClientHello. | |
af2db04c | 2074 | * al: a pointer to the alert value to send in the event of a failure. |
292bb568 | 2075 | * returns 1 on success, 0 on failure: al set only on failure |
af2db04c | 2076 | */ |
292bb568 | 2077 | static int tls1_alpn_handle_client_hello_late(SSL *s, int *al) |
af2db04c TS |
2078 | { |
2079 | const unsigned char *selected = NULL; | |
2080 | unsigned char selected_len = 0; | |
2081 | ||
2082 | if (s->ctx->alpn_select_cb != NULL && s->cert->alpn_proposed != NULL) { | |
2083 | int r = s->ctx->alpn_select_cb(s, &selected, &selected_len, | |
2084 | s->cert->alpn_proposed, | |
2085 | s->cert->alpn_proposed_len, | |
2086 | s->ctx->alpn_select_cb_arg); | |
2087 | ||
2088 | if (r == SSL_TLSEXT_ERR_OK) { | |
2089 | OPENSSL_free(s->s3->alpn_selected); | |
2090 | s->s3->alpn_selected = OPENSSL_malloc(selected_len); | |
2091 | if (s->s3->alpn_selected == NULL) { | |
2092 | *al = SSL_AD_INTERNAL_ERROR; | |
af2db04c TS |
2093 | return 0; |
2094 | } | |
2095 | memcpy(s->s3->alpn_selected, selected, selected_len); | |
2096 | s->s3->alpn_selected_len = selected_len; | |
2097 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
2098 | /* ALPN takes precedence over NPN. */ | |
2099 | s->s3->next_proto_neg_seen = 0; | |
2100 | # endif | |
2101 | } | |
2102 | } | |
2103 | ||
2104 | return 1; | |
2105 | } | |
2106 | ||
ae5c8664 | 2107 | static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, |
61dfe3a7 | 2108 | unsigned char *limit, int *al) |
ae5c8664 MC |
2109 | { |
2110 | unsigned short type; | |
2111 | unsigned short size; | |
2112 | unsigned short len; | |
2113 | unsigned char *data = *p; | |
2114 | int renegotiate_seen = 0; | |
2115 | ||
2116 | s->servername_done = 0; | |
2117 | s->tlsext_status_type = -1; | |
2118 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
2119 | s->s3->next_proto_neg_seen = 0; | |
2120 | # endif | |
2121 | ||
2122 | if (s->s3->alpn_selected) { | |
2123 | OPENSSL_free(s->s3->alpn_selected); | |
2124 | s->s3->alpn_selected = NULL; | |
2125 | } | |
af2db04c TS |
2126 | s->s3->alpn_selected_len = 0; |
2127 | if (s->cert->alpn_proposed) { | |
2128 | OPENSSL_free(s->cert->alpn_proposed); | |
2129 | s->cert->alpn_proposed = NULL; | |
2130 | } | |
2131 | s->cert->alpn_proposed_len = 0; | |
ae5c8664 MC |
2132 | # ifndef OPENSSL_NO_HEARTBEATS |
2133 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
2134 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
2135 | # endif | |
2136 | ||
2137 | # ifndef OPENSSL_NO_EC | |
2138 | if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG) | |
61dfe3a7 | 2139 | ssl_check_for_safari(s, data, limit); |
ae5c8664 MC |
2140 | # endif /* !OPENSSL_NO_EC */ |
2141 | ||
2142 | /* Clear any signature algorithms extension received */ | |
2143 | if (s->cert->peer_sigalgs) { | |
2144 | OPENSSL_free(s->cert->peer_sigalgs); | |
2145 | s->cert->peer_sigalgs = NULL; | |
2146 | } | |
2147 | # ifndef OPENSSL_NO_SRP | |
2148 | if (s->srp_ctx.login != NULL) { | |
2149 | OPENSSL_free(s->srp_ctx.login); | |
2150 | s->srp_ctx.login = NULL; | |
2151 | } | |
2152 | # endif | |
2153 | ||
2154 | s->srtp_profile = NULL; | |
2155 | ||
61dfe3a7 | 2156 | if (data == limit) |
fe64245a AL |
2157 | goto ri_check; |
2158 | ||
a004e72b | 2159 | if (limit - data < 2) |
fe64245a AL |
2160 | goto err; |
2161 | ||
ae5c8664 MC |
2162 | n2s(data, len); |
2163 | ||
a004e72b | 2164 | if (limit - data != len) |
d2725992 | 2165 | goto err; |
ae5c8664 | 2166 | |
a004e72b | 2167 | while (limit - data >= 4) { |
ae5c8664 MC |
2168 | n2s(data, type); |
2169 | n2s(data, size); | |
2170 | ||
a004e72b | 2171 | if (limit - data < size) |
d2725992 | 2172 | goto err; |
ae5c8664 MC |
2173 | # if 0 |
2174 | fprintf(stderr, "Received extension type %d size %d\n", type, size); | |
2175 | # endif | |
2176 | if (s->tlsext_debug_cb) | |
2177 | s->tlsext_debug_cb(s, 0, type, data, size, s->tlsext_debug_arg); | |
6977c7e2 TH |
2178 | /*- |
2179 | * The servername extension is treated as follows: | |
2180 | * | |
2181 | * - Only the hostname type is supported with a maximum length of 255. | |
2182 | * - The servername is rejected if too long or if it contains zeros, | |
2183 | * in which case an fatal alert is generated. | |
2184 | * - The servername field is maintained together with the session cache. | |
2185 | * - When a session is resumed, the servername call back invoked in order | |
ae5c8664 MC |
2186 | * to allow the application to position itself to the right context. |
2187 | * - The servername is acknowledged if it is new for a session or when | |
2188 | * it is identical to a previously used for the same session. | |
6977c7e2 TH |
2189 | * Applications can control the behaviour. They can at any time |
2190 | * set a 'desirable' servername for a new SSL object. This can be the | |
2191 | * case for example with HTTPS when a Host: header field is received and | |
2192 | * a renegotiation is requested. In this case, a possible servername | |
2193 | * presented in the new client hello is only acknowledged if it matches | |
ae5c8664 | 2194 | * the value of the Host: field. |
6977c7e2 | 2195 | * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION |
ae5c8664 MC |
2196 | * if they provide for changing an explicit servername context for the |
2197 | * session, i.e. when the session has been established with a servername | |
2198 | * extension. | |
2199 | * - On session reconnect, the servername extension may be absent. | |
6977c7e2 | 2200 | * |
ae5c8664 | 2201 | */ |
ed3883d2 | 2202 | |
ae5c8664 MC |
2203 | if (type == TLSEXT_TYPE_server_name) { |
2204 | unsigned char *sdata; | |
2205 | int servname_type; | |
2206 | int dsize; | |
2207 | ||
d2725992 MC |
2208 | if (size < 2) |
2209 | goto err; | |
ae5c8664 MC |
2210 | n2s(data, dsize); |
2211 | size -= 2; | |
d2725992 MC |
2212 | if (dsize > size) |
2213 | goto err; | |
ae5c8664 MC |
2214 | |
2215 | sdata = data; | |
2216 | while (dsize > 3) { | |
2217 | servname_type = *(sdata++); | |
2218 | n2s(sdata, len); | |
2219 | dsize -= 3; | |
2220 | ||
d2725992 MC |
2221 | if (len > dsize) |
2222 | goto err; | |
2223 | ||
ae5c8664 MC |
2224 | if (s->servername_done == 0) |
2225 | switch (servname_type) { | |
2226 | case TLSEXT_NAMETYPE_host_name: | |
2227 | if (!s->hit) { | |
d2725992 MC |
2228 | if (s->session->tlsext_hostname) |
2229 | goto err; | |
2230 | ||
ae5c8664 MC |
2231 | if (len > TLSEXT_MAXLEN_host_name) { |
2232 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
2233 | return 0; | |
2234 | } | |
2235 | if ((s->session->tlsext_hostname = | |
2236 | OPENSSL_malloc(len + 1)) == NULL) { | |
2237 | *al = TLS1_AD_INTERNAL_ERROR; | |
2238 | return 0; | |
2239 | } | |
2240 | memcpy(s->session->tlsext_hostname, sdata, len); | |
2241 | s->session->tlsext_hostname[len] = '\0'; | |
2242 | if (strlen(s->session->tlsext_hostname) != len) { | |
2243 | OPENSSL_free(s->session->tlsext_hostname); | |
2244 | s->session->tlsext_hostname = NULL; | |
2245 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
2246 | return 0; | |
2247 | } | |
2248 | s->servername_done = 1; | |
761772d7 | 2249 | |
ae5c8664 MC |
2250 | } else |
2251 | s->servername_done = s->session->tlsext_hostname | |
2252 | && strlen(s->session->tlsext_hostname) == len | |
2253 | && strncmp(s->session->tlsext_hostname, | |
2254 | (char *)sdata, len) == 0; | |
e27711cf | 2255 | |
ae5c8664 | 2256 | break; |
8a02a46a | 2257 | |
ae5c8664 MC |
2258 | default: |
2259 | break; | |
2260 | } | |
2456cd58 | 2261 | |
ae5c8664 MC |
2262 | dsize -= len; |
2263 | } | |
d2725992 MC |
2264 | if (dsize != 0) |
2265 | goto err; | |
2456cd58 | 2266 | |
ae5c8664 MC |
2267 | } |
2268 | # ifndef OPENSSL_NO_SRP | |
2269 | else if (type == TLSEXT_TYPE_srp) { | |
d2725992 MC |
2270 | if (size == 0 || ((len = data[0])) != (size - 1)) |
2271 | goto err; | |
2272 | if (s->srp_ctx.login != NULL) | |
2273 | goto err; | |
ae5c8664 MC |
2274 | if ((s->srp_ctx.login = OPENSSL_malloc(len + 1)) == NULL) |
2275 | return -1; | |
2276 | memcpy(s->srp_ctx.login, &data[1], len); | |
2277 | s->srp_ctx.login[len] = '\0'; | |
2278 | ||
d2725992 MC |
2279 | if (strlen(s->srp_ctx.login) != len) |
2280 | goto err; | |
ae5c8664 MC |
2281 | } |
2282 | # endif | |
2283 | ||
2284 | # ifndef OPENSSL_NO_EC | |
2285 | else if (type == TLSEXT_TYPE_ec_point_formats) { | |
2286 | unsigned char *sdata = data; | |
99bb59d9 | 2287 | int ecpointformatlist_length; |
ae5c8664 | 2288 | |
43032197 | 2289 | if (size == 0) |
99bb59d9 | 2290 | goto err; |
99bb59d9 PA |
2291 | |
2292 | ecpointformatlist_length = *(sdata++); | |
ae5c8664 | 2293 | if (ecpointformatlist_length != size - 1 || |
d2725992 MC |
2294 | ecpointformatlist_length < 1) |
2295 | goto err; | |
ae5c8664 MC |
2296 | if (!s->hit) { |
2297 | if (s->session->tlsext_ecpointformatlist) { | |
2298 | OPENSSL_free(s->session->tlsext_ecpointformatlist); | |
2299 | s->session->tlsext_ecpointformatlist = NULL; | |
2300 | } | |
2301 | s->session->tlsext_ecpointformatlist_length = 0; | |
2302 | if ((s->session->tlsext_ecpointformatlist = | |
2303 | OPENSSL_malloc(ecpointformatlist_length)) == NULL) { | |
2304 | *al = TLS1_AD_INTERNAL_ERROR; | |
2305 | return 0; | |
2306 | } | |
2307 | s->session->tlsext_ecpointformatlist_length = | |
2308 | ecpointformatlist_length; | |
2309 | memcpy(s->session->tlsext_ecpointformatlist, sdata, | |
2310 | ecpointformatlist_length); | |
2311 | } | |
2312 | # if 0 | |
2313 | fprintf(stderr, | |
2314 | "ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", | |
2315 | s->session->tlsext_ecpointformatlist_length); | |
2316 | sdata = s->session->tlsext_ecpointformatlist; | |
2317 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
2318 | fprintf(stderr, "%i ", *(sdata++)); | |
2319 | fprintf(stderr, "\n"); | |
2320 | # endif | |
2321 | } else if (type == TLSEXT_TYPE_elliptic_curves) { | |
2322 | unsigned char *sdata = data; | |
2323 | int ellipticcurvelist_length = (*(sdata++) << 8); | |
2324 | ellipticcurvelist_length += (*(sdata++)); | |
2325 | ||
2326 | if (ellipticcurvelist_length != size - 2 || | |
2327 | ellipticcurvelist_length < 1 || | |
2328 | /* Each NamedCurve is 2 bytes. */ | |
d2725992 MC |
2329 | ellipticcurvelist_length & 1) |
2330 | goto err; | |
2331 | ||
ae5c8664 | 2332 | if (!s->hit) { |
d2725992 MC |
2333 | if (s->session->tlsext_ellipticcurvelist) |
2334 | goto err; | |
2335 | ||
ae5c8664 MC |
2336 | s->session->tlsext_ellipticcurvelist_length = 0; |
2337 | if ((s->session->tlsext_ellipticcurvelist = | |
2338 | OPENSSL_malloc(ellipticcurvelist_length)) == NULL) { | |
2339 | *al = TLS1_AD_INTERNAL_ERROR; | |
2340 | return 0; | |
2341 | } | |
2342 | s->session->tlsext_ellipticcurvelist_length = | |
2343 | ellipticcurvelist_length; | |
2344 | memcpy(s->session->tlsext_ellipticcurvelist, sdata, | |
2345 | ellipticcurvelist_length); | |
2346 | } | |
2347 | # if 0 | |
2348 | fprintf(stderr, | |
2349 | "ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", | |
2350 | s->session->tlsext_ellipticcurvelist_length); | |
2351 | sdata = s->session->tlsext_ellipticcurvelist; | |
2352 | for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) | |
2353 | fprintf(stderr, "%i ", *(sdata++)); | |
2354 | fprintf(stderr, "\n"); | |
2355 | # endif | |
2356 | } | |
2357 | # endif /* OPENSSL_NO_EC */ | |
2358 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
2359 | else if (type == TLSEXT_TYPE_opaque_prf_input) { | |
2360 | unsigned char *sdata = data; | |
2361 | ||
2362 | if (size < 2) { | |
2363 | *al = SSL_AD_DECODE_ERROR; | |
2364 | return 0; | |
2365 | } | |
2366 | n2s(sdata, s->s3->client_opaque_prf_input_len); | |
2367 | if (s->s3->client_opaque_prf_input_len != size - 2) { | |
2368 | *al = SSL_AD_DECODE_ERROR; | |
2369 | return 0; | |
2370 | } | |
2371 | ||
2372 | if (s->s3->client_opaque_prf_input != NULL) { | |
2373 | /* shouldn't really happen */ | |
2374 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
2375 | } | |
2376 | ||
2377 | /* dummy byte just to get non-NULL */ | |
2378 | if (s->s3->client_opaque_prf_input_len == 0) | |
2379 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); | |
2380 | else | |
2381 | s->s3->client_opaque_prf_input = | |
2382 | BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); | |
2383 | if (s->s3->client_opaque_prf_input == NULL) { | |
2384 | *al = TLS1_AD_INTERNAL_ERROR; | |
2385 | return 0; | |
2386 | } | |
2387 | } | |
2388 | # endif | |
2389 | else if (type == TLSEXT_TYPE_session_ticket) { | |
2390 | if (s->tls_session_ticket_ext_cb && | |
2391 | !s->tls_session_ticket_ext_cb(s, data, size, | |
2392 | s->tls_session_ticket_ext_cb_arg)) | |
2393 | { | |
2394 | *al = TLS1_AD_INTERNAL_ERROR; | |
2395 | return 0; | |
2396 | } | |
2397 | } else if (type == TLSEXT_TYPE_renegotiate) { | |
2398 | if (!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) | |
2399 | return 0; | |
2400 | renegotiate_seen = 1; | |
2401 | } else if (type == TLSEXT_TYPE_signature_algorithms) { | |
2402 | int dsize; | |
d2725992 MC |
2403 | if (s->cert->peer_sigalgs || size < 2) |
2404 | goto err; | |
ae5c8664 MC |
2405 | n2s(data, dsize); |
2406 | size -= 2; | |
d2725992 MC |
2407 | if (dsize != size || dsize & 1 || !dsize) |
2408 | goto err; | |
2409 | if (!tls1_save_sigalgs(s, data, dsize)) | |
2410 | goto err; | |
1084fc8f | 2411 | } else if (type == TLSEXT_TYPE_status_request && !s->hit) { |
d2725992 MC |
2412 | if (size < 5) |
2413 | goto err; | |
ae5c8664 MC |
2414 | |
2415 | s->tlsext_status_type = *data++; | |
2416 | size--; | |
2417 | if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) { | |
2418 | const unsigned char *sdata; | |
2419 | int dsize; | |
2420 | /* Read in responder_id_list */ | |
2421 | n2s(data, dsize); | |
2422 | size -= 2; | |
d2725992 MC |
2423 | if (dsize > size) |
2424 | goto err; | |
ea39b16b MC |
2425 | |
2426 | /* | |
2427 | * We remove any OCSP_RESPIDs from a previous handshake | |
2428 | * to prevent unbounded memory growth - CVE-2016-6304 | |
2429 | */ | |
2430 | sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, | |
2431 | OCSP_RESPID_free); | |
2432 | if (dsize > 0) { | |
2433 | s->tlsext_ocsp_ids = sk_OCSP_RESPID_new_null(); | |
2434 | if (s->tlsext_ocsp_ids == NULL) { | |
2435 | *al = SSL_AD_INTERNAL_ERROR; | |
2436 | return 0; | |
2437 | } | |
2438 | } else { | |
2439 | s->tlsext_ocsp_ids = NULL; | |
2440 | } | |
2441 | ||
ae5c8664 MC |
2442 | while (dsize > 0) { |
2443 | OCSP_RESPID *id; | |
2444 | int idsize; | |
d2725992 MC |
2445 | if (dsize < 4) |
2446 | goto err; | |
ae5c8664 MC |
2447 | n2s(data, idsize); |
2448 | dsize -= 2 + idsize; | |
2449 | size -= 2 + idsize; | |
d2725992 MC |
2450 | if (dsize < 0) |
2451 | goto err; | |
ae5c8664 MC |
2452 | sdata = data; |
2453 | data += idsize; | |
2454 | id = d2i_OCSP_RESPID(NULL, &sdata, idsize); | |
d2725992 MC |
2455 | if (!id) |
2456 | goto err; | |
ae5c8664 MC |
2457 | if (data != sdata) { |
2458 | OCSP_RESPID_free(id); | |
d2725992 | 2459 | goto err; |
ae5c8664 | 2460 | } |
ae5c8664 MC |
2461 | if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) { |
2462 | OCSP_RESPID_free(id); | |
2463 | *al = SSL_AD_INTERNAL_ERROR; | |
2464 | return 0; | |
2465 | } | |
2466 | } | |
2456cd58 | 2467 | |
ae5c8664 | 2468 | /* Read in request_extensions */ |
d2725992 MC |
2469 | if (size < 2) |
2470 | goto err; | |
ae5c8664 MC |
2471 | n2s(data, dsize); |
2472 | size -= 2; | |
d2725992 MC |
2473 | if (dsize != size) |
2474 | goto err; | |
ae5c8664 MC |
2475 | sdata = data; |
2476 | if (dsize > 0) { | |
2477 | if (s->tlsext_ocsp_exts) { | |
2478 | sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, | |
2479 | X509_EXTENSION_free); | |
2480 | } | |
2481 | ||
2482 | s->tlsext_ocsp_exts = | |
2483 | d2i_X509_EXTENSIONS(NULL, &sdata, dsize); | |
d2725992 MC |
2484 | if (!s->tlsext_ocsp_exts || (data + dsize != sdata)) |
2485 | goto err; | |
ae5c8664 MC |
2486 | } |
2487 | } | |
2488 | /* | |
2489 | * We don't know what to do with any other type * so ignore it. | |
2490 | */ | |
2491 | else | |
2492 | s->tlsext_status_type = -1; | |
2493 | } | |
2494 | # ifndef OPENSSL_NO_HEARTBEATS | |
2495 | else if (type == TLSEXT_TYPE_heartbeat) { | |
2496 | switch (data[0]) { | |
2497 | case 0x01: /* Client allows us to send HB requests */ | |
2498 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2499 | break; | |
2500 | case 0x02: /* Client doesn't accept HB requests */ | |
2501 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2502 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
2503 | break; | |
2504 | default: | |
2505 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
2506 | return 0; | |
2507 | } | |
2508 | } | |
2509 | # endif | |
2510 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
2511 | else if (type == TLSEXT_TYPE_next_proto_neg && | |
af2db04c | 2512 | s->s3->tmp.finish_md_len == 0) { |
83975c80 MC |
2513 | /*- |
2514 | * We shouldn't accept this extension on a | |
2515 | * renegotiation. | |
2516 | * | |
2517 | * s->new_session will be set on renegotiation, but we | |
2518 | * probably shouldn't rely that it couldn't be set on | |
2519 | * the initial renegotation too in certain cases (when | |
2520 | * there's some other reason to disallow resuming an | |
2521 | * earlier session -- the current code won't be doing | |
2522 | * anything like that, but this might change). | |
2523 | * | |
2524 | * A valid sign that there's been a previous handshake | |
2525 | * in this connection is if s->s3->tmp.finish_md_len > | |
2526 | * 0. (We are talking about a check that will happen | |
2527 | * in the Hello protocol round, well before a new | |
2528 | * Finished message could have been computed.) | |
2529 | */ | |
ae5c8664 MC |
2530 | s->s3->next_proto_neg_seen = 1; |
2531 | } | |
2532 | # endif | |
2533 | ||
2534 | else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation && | |
af2db04c | 2535 | s->s3->tmp.finish_md_len == 0) { |
ae5c8664 MC |
2536 | if (tls1_alpn_handle_client_hello(s, data, size, al) != 0) |
2537 | return 0; | |
ae5c8664 | 2538 | } |
2456cd58 | 2539 | |
ae5c8664 MC |
2540 | /* session ticket processed earlier */ |
2541 | # ifndef OPENSSL_NO_SRTP | |
2542 | else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s) | |
2543 | && type == TLSEXT_TYPE_use_srtp) { | |
2544 | if (ssl_parse_clienthello_use_srtp_ext(s, data, size, al)) | |
2545 | return 0; | |
2546 | } | |
2547 | # endif | |
2548 | ||
2549 | data += size; | |
2550 | } | |
2551 | ||
d2725992 | 2552 | /* Spurious data on the end */ |
61dfe3a7 | 2553 | if (data != limit) |
d2725992 MC |
2554 | goto err; |
2555 | ||
ae5c8664 MC |
2556 | *p = data; |
2557 | ||
2558 | ri_check: | |
2559 | ||
2560 | /* Need RI if renegotiating */ | |
2561 | ||
2562 | if (!renegotiate_seen && s->renegotiate && | |
2563 | !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
2564 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2565 | SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, | |
2566 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
2567 | return 0; | |
2568 | } | |
2569 | ||
2570 | return 1; | |
d2725992 MC |
2571 | err: |
2572 | *al = SSL_AD_DECODE_ERROR; | |
2573 | return 0; | |
ae5c8664 | 2574 | } |
f1fd4544 | 2575 | |
82182413 DSH |
2576 | /* |
2577 | * Parse any custom extensions found. "data" is the start of the extension data | |
2578 | * and "limit" is the end of the record. TODO: add strict syntax checking. | |
2579 | */ | |
2580 | ||
ae5c8664 MC |
2581 | static int ssl_scan_clienthello_custom_tlsext(SSL *s, |
2582 | const unsigned char *data, | |
2583 | const unsigned char *limit, | |
2584 | int *al) | |
2585 | { | |
2586 | unsigned short type, size, len; | |
2587 | /* If resumed session or no custom extensions nothing to do */ | |
2588 | if (s->hit || s->cert->srv_ext.meths_count == 0) | |
2589 | return 1; | |
1d0c47fd | 2590 | |
a004e72b | 2591 | if (limit - data <= 2) |
ae5c8664 MC |
2592 | return 1; |
2593 | n2s(data, len); | |
68b33cc5 | 2594 | |
a004e72b | 2595 | if (limit - data < len) |
ae5c8664 | 2596 | return 1; |
8cd897a4 | 2597 | |
a004e72b | 2598 | while (limit - data >= 4) { |
ae5c8664 MC |
2599 | n2s(data, type); |
2600 | n2s(data, size); | |
b0d6f3c5 | 2601 | |
a004e72b | 2602 | if (limit - data < size) |
ae5c8664 MC |
2603 | return 1; |
2604 | if (custom_ext_parse(s, 1 /* server */ , type, data, size, al) <= 0) | |
2605 | return 0; | |
bd6941cf | 2606 | |
ae5c8664 MC |
2607 | data += size; |
2608 | } | |
ed3883d2 | 2609 | |
ae5c8664 MC |
2610 | return 1; |
2611 | } | |
b0d6f3c5 | 2612 | |
61dfe3a7 MC |
2613 | int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, |
2614 | unsigned char *limit) | |
ae5c8664 MC |
2615 | { |
2616 | int al = -1; | |
2617 | unsigned char *ptmp = *p; | |
2618 | /* | |
2619 | * Internally supported extensions are parsed first so SNI can be handled | |
2620 | * before custom extensions. An application processing SNI will typically | |
2621 | * switch the parent context using SSL_set_SSL_CTX and custom extensions | |
2622 | * need to be handled by the new SSL_CTX structure. | |
2623 | */ | |
61dfe3a7 | 2624 | if (ssl_scan_clienthello_tlsext(s, p, limit, &al) <= 0) { |
ae5c8664 MC |
2625 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
2626 | return 0; | |
2627 | } | |
2628 | ||
2629 | if (ssl_check_clienthello_tlsext_early(s) <= 0) { | |
2630 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, SSL_R_CLIENTHELLO_TLSEXT); | |
2631 | return 0; | |
2632 | } | |
2633 | ||
2634 | custom_ext_init(&s->cert->srv_ext); | |
61dfe3a7 | 2635 | if (ssl_scan_clienthello_custom_tlsext(s, ptmp, limit, &al) <= 0) { |
ae5c8664 MC |
2636 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
2637 | return 0; | |
2638 | } | |
2639 | ||
2640 | return 1; | |
2641 | } | |
ed3883d2 | 2642 | |
ae5c8664 MC |
2643 | # ifndef OPENSSL_NO_NEXTPROTONEG |
2644 | /* | |
2645 | * ssl_next_proto_validate validates a Next Protocol Negotiation block. No | |
2646 | * elements of zero length are allowed and the set of elements must exactly | |
2647 | * fill the length of the block. | |
2648 | */ | |
2649 | static char ssl_next_proto_validate(unsigned char *d, unsigned len) | |
2650 | { | |
2651 | unsigned int off = 0; | |
2652 | ||
2653 | while (off < len) { | |
2654 | if (d[off] == 0) | |
2655 | return 0; | |
2656 | off += d[off]; | |
2657 | off++; | |
2658 | } | |
2659 | ||
2660 | return off == len; | |
2661 | } | |
2662 | # endif | |
2663 | ||
2664 | static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, | |
2665 | unsigned char *d, int n, int *al) | |
2666 | { | |
2667 | unsigned short length; | |
2668 | unsigned short type; | |
2669 | unsigned short size; | |
2670 | unsigned char *data = *p; | |
2671 | int tlsext_servername = 0; | |
2672 | int renegotiate_seen = 0; | |
2673 | ||
2674 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
2675 | s->s3->next_proto_neg_seen = 0; | |
2676 | # endif | |
2677 | s->tlsext_ticket_expected = 0; | |
2678 | ||
2679 | if (s->s3->alpn_selected) { | |
2680 | OPENSSL_free(s->s3->alpn_selected); | |
2681 | s->s3->alpn_selected = NULL; | |
2682 | } | |
2683 | # ifndef OPENSSL_NO_HEARTBEATS | |
2684 | s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED | | |
2685 | SSL_TLSEXT_HB_DONT_SEND_REQUESTS); | |
2686 | # endif | |
2687 | ||
a004e72b | 2688 | if ((d + n) - data <= 2) |
ae5c8664 MC |
2689 | goto ri_check; |
2690 | ||
2691 | n2s(data, length); | |
a004e72b | 2692 | if ((d + n) - data != length) { |
ae5c8664 MC |
2693 | *al = SSL_AD_DECODE_ERROR; |
2694 | return 0; | |
2695 | } | |
2696 | ||
a004e72b | 2697 | while ((d + n) - data >= 4) { |
ae5c8664 MC |
2698 | n2s(data, type); |
2699 | n2s(data, size); | |
2700 | ||
a004e72b | 2701 | if ((d + n) - data < size) |
ae5c8664 MC |
2702 | goto ri_check; |
2703 | ||
2704 | if (s->tlsext_debug_cb) | |
2705 | s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg); | |
2706 | ||
2707 | if (type == TLSEXT_TYPE_server_name) { | |
2708 | if (s->tlsext_hostname == NULL || size > 0) { | |
2709 | *al = TLS1_AD_UNRECOGNIZED_NAME; | |
2710 | return 0; | |
2711 | } | |
2712 | tlsext_servername = 1; | |
2713 | } | |
2714 | # ifndef OPENSSL_NO_EC | |
2715 | else if (type == TLSEXT_TYPE_ec_point_formats) { | |
2716 | unsigned char *sdata = data; | |
99bb59d9 PA |
2717 | int ecpointformatlist_length; |
2718 | ||
2719 | if (size == 0) { | |
2720 | *al = TLS1_AD_DECODE_ERROR; | |
2721 | return 0; | |
2722 | } | |
ae5c8664 | 2723 | |
99bb59d9 | 2724 | ecpointformatlist_length = *(sdata++); |
ae5c8664 MC |
2725 | if (ecpointformatlist_length != size - 1) { |
2726 | *al = TLS1_AD_DECODE_ERROR; | |
2727 | return 0; | |
2728 | } | |
2729 | if (!s->hit) { | |
2730 | s->session->tlsext_ecpointformatlist_length = 0; | |
2731 | if (s->session->tlsext_ecpointformatlist != NULL) | |
2732 | OPENSSL_free(s->session->tlsext_ecpointformatlist); | |
2733 | if ((s->session->tlsext_ecpointformatlist = | |
2734 | OPENSSL_malloc(ecpointformatlist_length)) == NULL) { | |
2735 | *al = TLS1_AD_INTERNAL_ERROR; | |
2736 | return 0; | |
2737 | } | |
2738 | s->session->tlsext_ecpointformatlist_length = | |
2739 | ecpointformatlist_length; | |
2740 | memcpy(s->session->tlsext_ecpointformatlist, sdata, | |
2741 | ecpointformatlist_length); | |
2742 | } | |
2743 | # if 0 | |
2744 | fprintf(stderr, | |
2745 | "ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); | |
2746 | sdata = s->session->tlsext_ecpointformatlist; | |
2747 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) | |
2748 | fprintf(stderr, "%i ", *(sdata++)); | |
2749 | fprintf(stderr, "\n"); | |
2750 | # endif | |
2751 | } | |
2752 | # endif /* OPENSSL_NO_EC */ | |
2753 | ||
2754 | else if (type == TLSEXT_TYPE_session_ticket) { | |
2755 | if (s->tls_session_ticket_ext_cb && | |
2756 | !s->tls_session_ticket_ext_cb(s, data, size, | |
2757 | s->tls_session_ticket_ext_cb_arg)) | |
2758 | { | |
2759 | *al = TLS1_AD_INTERNAL_ERROR; | |
2760 | return 0; | |
2761 | } | |
2762 | if ((SSL_get_options(s) & SSL_OP_NO_TICKET) | |
2763 | || (size > 0)) { | |
2764 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2765 | return 0; | |
2766 | } | |
2767 | s->tlsext_ticket_expected = 1; | |
2768 | } | |
2769 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
2770 | else if (type == TLSEXT_TYPE_opaque_prf_input) { | |
2771 | unsigned char *sdata = data; | |
2772 | ||
2773 | if (size < 2) { | |
2774 | *al = SSL_AD_DECODE_ERROR; | |
2775 | return 0; | |
2776 | } | |
2777 | n2s(sdata, s->s3->server_opaque_prf_input_len); | |
2778 | if (s->s3->server_opaque_prf_input_len != size - 2) { | |
2779 | *al = SSL_AD_DECODE_ERROR; | |
2780 | return 0; | |
2781 | } | |
2782 | ||
2783 | if (s->s3->server_opaque_prf_input != NULL) { | |
2784 | /* shouldn't really happen */ | |
2785 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
2786 | } | |
2787 | if (s->s3->server_opaque_prf_input_len == 0) { | |
2788 | /* dummy byte just to get non-NULL */ | |
2789 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); | |
2790 | } else { | |
2791 | s->s3->server_opaque_prf_input = | |
2792 | BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); | |
2793 | } | |
2794 | ||
2795 | if (s->s3->server_opaque_prf_input == NULL) { | |
2796 | *al = TLS1_AD_INTERNAL_ERROR; | |
2797 | return 0; | |
2798 | } | |
2799 | } | |
2800 | # endif | |
2801 | else if (type == TLSEXT_TYPE_status_request) { | |
2802 | /* | |
2803 | * MUST be empty and only sent if we've requested a status | |
2804 | * request message. | |
2805 | */ | |
2806 | if ((s->tlsext_status_type == -1) || (size > 0)) { | |
2807 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2808 | return 0; | |
2809 | } | |
2810 | /* Set flag to expect CertificateStatus message */ | |
2811 | s->tlsext_status_expected = 1; | |
2812 | } | |
2813 | # ifndef OPENSSL_NO_NEXTPROTONEG | |
2814 | else if (type == TLSEXT_TYPE_next_proto_neg && | |
2815 | s->s3->tmp.finish_md_len == 0) { | |
2816 | unsigned char *selected; | |
2817 | unsigned char selected_len; | |
2818 | ||
2819 | /* We must have requested it. */ | |
2820 | if (s->ctx->next_proto_select_cb == NULL) { | |
2821 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; | |
2822 | return 0; | |
2823 | } | |
2824 | /* The data must be valid */ | |
2825 | if (!ssl_next_proto_validate(data, size)) { | |
2826 | *al = TLS1_AD_DECODE_ERROR; | |
2827 | return 0; | |
2828 | } | |
2829 | if (s-> | |
2830 | ctx->next_proto_select_cb(s, &selected, &selected_len, data, | |
2831 | size, | |
2832 | s->ctx->next_proto_select_cb_arg) != | |
2833 | SSL_TLSEXT_ERR_OK) { | |
2834 | *al = TLS1_AD_INTERNAL_ERROR; | |
2835 | return 0; | |
2836 | } | |
38f59bd1 MC |
2837 | /* |
2838 | * Could be non-NULL if server has sent multiple NPN extensions in | |
2839 | * a single Serverhello | |
2840 | */ | |
2841 | OPENSSL_free(s->next_proto_negotiated); | |
ae5c8664 MC |
2842 | s->next_proto_negotiated = OPENSSL_malloc(selected_len); |
2843 | if (!s->next_proto_negotiated) { | |
2844 | *al = TLS1_AD_INTERNAL_ERROR; | |
2845 | return 0; | |
2846 | } | |
2847 | memcpy(s->next_proto_negotiated, selected, selected_len); | |
2848 | s->next_proto_negotiated_len = selected_len; | |
2849 | s->s3->next_proto_neg_seen = 1; | |
2850 | } | |
2851 | # endif | |
2852 | ||
2853 | else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation) { | |
2854 | unsigned len; | |
2855 | ||
2856 | /* We must have requested it. */ | |
af2db04c | 2857 | if (!s->cert->alpn_sent) { |
ae5c8664 MC |
2858 | *al = TLS1_AD_UNSUPPORTED_EXTENSION; |
2859 | return 0; | |
2860 | } | |
2861 | if (size < 4) { | |
2862 | *al = TLS1_AD_DECODE_ERROR; | |
2863 | return 0; | |
2864 | } | |
83975c80 MC |
2865 | /*- |
2866 | * The extension data consists of: | |
2867 | * uint16 list_length | |
2868 | * uint8 proto_length; | |
2869 | * uint8 proto[proto_length]; | |
2870 | */ | |
ae5c8664 MC |
2871 | len = data[0]; |
2872 | len <<= 8; | |
2873 | len |= data[1]; | |
2874 | if (len != (unsigned)size - 2) { | |
2875 | *al = TLS1_AD_DECODE_ERROR; | |
2876 | return 0; | |
2877 | } | |
2878 | len = data[2]; | |
2879 | if (len != (unsigned)size - 3) { | |
2880 | *al = TLS1_AD_DECODE_ERROR; | |
2881 | return 0; | |
2882 | } | |
2883 | if (s->s3->alpn_selected) | |
2884 | OPENSSL_free(s->s3->alpn_selected); | |
2885 | s->s3->alpn_selected = OPENSSL_malloc(len); | |
2886 | if (!s->s3->alpn_selected) { | |
2887 | *al = TLS1_AD_INTERNAL_ERROR; | |
2888 | return 0; | |
2889 | } | |
2890 | memcpy(s->s3->alpn_selected, data + 3, len); | |
2891 | s->s3->alpn_selected_len = len; | |
2892 | } | |
2893 | ||
2894 | else if (type == TLSEXT_TYPE_renegotiate) { | |
2895 | if (!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) | |
2896 | return 0; | |
2897 | renegotiate_seen = 1; | |
2898 | } | |
2899 | # ifndef OPENSSL_NO_HEARTBEATS | |
2900 | else if (type == TLSEXT_TYPE_heartbeat) { | |
2901 | switch (data[0]) { | |
2902 | case 0x01: /* Server allows us to send HB requests */ | |
2903 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2904 | break; | |
2905 | case 0x02: /* Server doesn't accept HB requests */ | |
2906 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; | |
2907 | s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS; | |
2908 | break; | |
2909 | default: | |
2910 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
2911 | return 0; | |
2912 | } | |
2913 | } | |
2914 | # endif | |
2915 | # ifndef OPENSSL_NO_SRTP | |
2916 | else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) { | |
2917 | if (ssl_parse_serverhello_use_srtp_ext(s, data, size, al)) | |
2918 | return 0; | |
2919 | } | |
2920 | # endif | |
2921 | /* | |
2922 | * If this extension type was not otherwise handled, but matches a | |
2923 | * custom_cli_ext_record, then send it to the c callback | |
2924 | */ | |
2925 | else if (custom_ext_parse(s, 0, type, data, size, al) <= 0) | |
2926 | return 0; | |
2927 | ||
2928 | data += size; | |
2929 | } | |
2930 | ||
2931 | if (data != d + n) { | |
2932 | *al = SSL_AD_DECODE_ERROR; | |
2933 | return 0; | |
2934 | } | |
2935 | ||
2936 | if (!s->hit && tlsext_servername == 1) { | |
2937 | if (s->tlsext_hostname) { | |
2938 | if (s->session->tlsext_hostname == NULL) { | |
2939 | s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); | |
2940 | if (!s->session->tlsext_hostname) { | |
2941 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
2942 | return 0; | |
2943 | } | |
2944 | } else { | |
2945 | *al = SSL_AD_DECODE_ERROR; | |
2946 | return 0; | |
2947 | } | |
2948 | } | |
2949 | } | |
2950 | ||
2951 | *p = data; | |
2952 | ||
2953 | ri_check: | |
2954 | ||
2955 | /* | |
2956 | * Determine if we need to see RI. Strictly speaking if we want to avoid | |
2957 | * an attack we should *always* see RI even on initial server hello | |
2958 | * because the client doesn't see any renegotiation during an attack. | |
2959 | * However this would mean we could not connect to any server which | |
2960 | * doesn't support RI so for the immediate future tolerate RI absence on | |
2961 | * initial connect only. | |
2962 | */ | |
2963 | if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) | |
2964 | && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
2965 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2966 | SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT, | |
2967 | SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); | |
2968 | return 0; | |
2969 | } | |
2970 | ||
2971 | return 1; | |
2972 | } | |
b2172f4f | 2973 | |
36ca4ba6 | 2974 | int ssl_prepare_clienthello_tlsext(SSL *s) |
ae5c8664 MC |
2975 | { |
2976 | ||
2977 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
2978 | { | |
2979 | int r = 1; | |
2980 | ||
2981 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) { | |
2982 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, | |
2983 | s-> | |
2984 | ctx->tlsext_opaque_prf_input_callback_arg); | |
2985 | if (!r) | |
2986 | return -1; | |
2987 | } | |
761772d7 | 2988 | |
ae5c8664 MC |
2989 | if (s->tlsext_opaque_prf_input != NULL) { |
2990 | if (s->s3->client_opaque_prf_input != NULL) { | |
2991 | /* shouldn't really happen */ | |
2992 | OPENSSL_free(s->s3->client_opaque_prf_input); | |
2993 | } | |
2994 | ||
2995 | if (s->tlsext_opaque_prf_input_len == 0) { | |
2996 | /* dummy byte just to get non-NULL */ | |
2997 | s->s3->client_opaque_prf_input = OPENSSL_malloc(1); | |
2998 | } else { | |
2999 | s->s3->client_opaque_prf_input = | |
3000 | BUF_memdup(s->tlsext_opaque_prf_input, | |
3001 | s->tlsext_opaque_prf_input_len); | |
3002 | } | |
3003 | if (s->s3->client_opaque_prf_input == NULL) { | |
3004 | SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT, | |
3005 | ERR_R_MALLOC_FAILURE); | |
3006 | return -1; | |
3007 | } | |
3008 | s->s3->client_opaque_prf_input_len = | |
3009 | s->tlsext_opaque_prf_input_len; | |
3010 | } | |
3011 | ||
3012 | if (r == 2) | |
3013 | /* | |
3014 | * at callback's request, insist on receiving an appropriate | |
3015 | * server opaque PRF input | |
3016 | */ | |
3017 | s->s3->server_opaque_prf_input_len = | |
3018 | s->tlsext_opaque_prf_input_len; | |
3019 | } | |
3020 | # endif | |
3021 | ||
af2db04c | 3022 | s->cert->alpn_sent = 0; |
ae5c8664 MC |
3023 | return 1; |
3024 | } | |
36ca4ba6 BM |
3025 | |
3026 | int ssl_prepare_serverhello_tlsext(SSL *s) | |
ae5c8664 MC |
3027 | { |
3028 | return 1; | |
3029 | } | |
36ca4ba6 | 3030 | |
da8512aa | 3031 | static int ssl_check_clienthello_tlsext_early(SSL *s) |
ae5c8664 MC |
3032 | { |
3033 | int ret = SSL_TLSEXT_ERR_NOACK; | |
3034 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
3035 | ||
3036 | # ifndef OPENSSL_NO_EC | |
3037 | /* | |
3038 | * The handling of the ECPointFormats extension is done elsewhere, namely | |
3039 | * in ssl3_choose_cipher in s3_lib.c. | |
3040 | */ | |
3041 | /* | |
3042 | * The handling of the EllipticCurves extension is done elsewhere, namely | |
3043 | * in ssl3_choose_cipher in s3_lib.c. | |
3044 | */ | |
3045 | # endif | |
3046 | ||
3047 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
3048 | ret = | |
3049 | s->ctx->tlsext_servername_callback(s, &al, | |
3050 | s->ctx->tlsext_servername_arg); | |
3051 | else if (s->initial_ctx != NULL | |
3052 | && s->initial_ctx->tlsext_servername_callback != 0) | |
3053 | ret = | |
3054 | s->initial_ctx->tlsext_servername_callback(s, &al, | |
3055 | s-> | |
3056 | initial_ctx->tlsext_servername_arg); | |
3057 | ||
3058 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
3059 | { | |
3060 | /* | |
3061 | * This sort of belongs into ssl_prepare_serverhello_tlsext(), but we | |
3062 | * might be sending an alert in response to the client hello, so this | |
3063 | * has to happen here in ssl_check_clienthello_tlsext_early(). | |
3064 | */ | |
3065 | ||
3066 | int r = 1; | |
3067 | ||
3068 | if (s->ctx->tlsext_opaque_prf_input_callback != 0) { | |
3069 | r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, | |
3070 | s-> | |
3071 | ctx->tlsext_opaque_prf_input_callback_arg); | |
3072 | if (!r) { | |
3073 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3074 | al = SSL_AD_INTERNAL_ERROR; | |
3075 | goto err; | |
3076 | } | |
3077 | } | |
36ca4ba6 | 3078 | |
ae5c8664 MC |
3079 | if (s->s3->server_opaque_prf_input != NULL) { |
3080 | /* shouldn't really happen */ | |
3081 | OPENSSL_free(s->s3->server_opaque_prf_input); | |
3082 | } | |
3083 | s->s3->server_opaque_prf_input = NULL; | |
3084 | ||
3085 | if (s->tlsext_opaque_prf_input != NULL) { | |
3086 | if (s->s3->client_opaque_prf_input != NULL && | |
3087 | s->s3->client_opaque_prf_input_len == | |
3088 | s->tlsext_opaque_prf_input_len) { | |
3089 | /* | |
3090 | * can only use this extension if we have a server opaque PRF | |
3091 | * input of the same length as the client opaque PRF input! | |
3092 | */ | |
3093 | ||
3094 | if (s->tlsext_opaque_prf_input_len == 0) { | |
3095 | /* dummy byte just to get non-NULL */ | |
3096 | s->s3->server_opaque_prf_input = OPENSSL_malloc(1); | |
3097 | } else { | |
3098 | s->s3->server_opaque_prf_input = | |
3099 | BUF_memdup(s->tlsext_opaque_prf_input, | |
3100 | s->tlsext_opaque_prf_input_len); | |
3101 | } | |
3102 | if (s->s3->server_opaque_prf_input == NULL) { | |
3103 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3104 | al = SSL_AD_INTERNAL_ERROR; | |
3105 | goto err; | |
3106 | } | |
3107 | s->s3->server_opaque_prf_input_len = | |
3108 | s->tlsext_opaque_prf_input_len; | |
3109 | } | |
3110 | } | |
36ca4ba6 | 3111 | |
ae5c8664 MC |
3112 | if (r == 2 && s->s3->server_opaque_prf_input == NULL) { |
3113 | /* | |
3114 | * The callback wants to enforce use of the extension, but we | |
3115 | * can't do that with the client opaque PRF input; abort the | |
3116 | * handshake. | |
3117 | */ | |
3118 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3119 | al = SSL_AD_HANDSHAKE_FAILURE; | |
3120 | } | |
3121 | } | |
761772d7 BM |
3122 | |
3123 | err: | |
ae5c8664 MC |
3124 | # endif |
3125 | switch (ret) { | |
3126 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
3127 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
3128 | return -1; | |
3129 | ||
3130 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
3131 | ssl3_send_alert(s, SSL3_AL_WARNING, al); | |
3132 | return 1; | |
3133 | ||
3134 | case SSL_TLSEXT_ERR_NOACK: | |
3135 | s->servername_done = 0; | |
3136 | default: | |
3137 | return 1; | |
3138 | } | |
3139 | } | |
f1fd4544 | 3140 | |
56e8dc54 | 3141 | int tls1_set_server_sigalgs(SSL *s) |
ae5c8664 MC |
3142 | { |
3143 | int al; | |
3144 | size_t i; | |
3145 | /* Clear any shared sigtnature algorithms */ | |
3146 | if (s->cert->shared_sigalgs) { | |
3147 | OPENSSL_free(s->cert->shared_sigalgs); | |
3148 | s->cert->shared_sigalgs = NULL; | |
76343947 | 3149 | s->cert->shared_sigalgslen = 0; |
ae5c8664 MC |
3150 | } |
3151 | /* Clear certificate digests and validity flags */ | |
3152 | for (i = 0; i < SSL_PKEY_NUM; i++) { | |
3153 | s->cert->pkeys[i].digest = NULL; | |
3154 | s->cert->pkeys[i].valid_flags = 0; | |
3155 | } | |
3156 | ||
3157 | /* If sigalgs received process it. */ | |
3158 | if (s->cert->peer_sigalgs) { | |
3159 | if (!tls1_process_sigalgs(s)) { | |
3160 | SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_MALLOC_FAILURE); | |
3161 | al = SSL_AD_INTERNAL_ERROR; | |
3162 | goto err; | |
3163 | } | |
3164 | /* Fatal error is no shared signature algorithms */ | |
3165 | if (!s->cert->shared_sigalgs) { | |
3166 | SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS, | |
3167 | SSL_R_NO_SHARED_SIGATURE_ALGORITHMS); | |
279bf3e0 | 3168 | al = SSL_AD_HANDSHAKE_FAILURE; |
ae5c8664 MC |
3169 | goto err; |
3170 | } | |
3171 | } else | |
3172 | ssl_cert_set_default_md(s->cert); | |
3173 | return 1; | |
3174 | err: | |
3175 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
3176 | return 0; | |
3177 | } | |
56e8dc54 | 3178 | |
292bb568 BK |
3179 | /* |
3180 | * Upon success, returns 1. | |
3181 | * Upon failure, returns 0 and sets |al| to the appropriate fatal alert. | |
3182 | */ | |
3183 | int ssl_check_clienthello_tlsext_late(SSL *s, int *al) | |
ae5c8664 | 3184 | { |
ae5c8664 MC |
3185 | |
3186 | /* | |
3187 | * If status request then ask callback what to do. Note: this must be | |
3188 | * called after servername callbacks in case the certificate has changed, | |
3189 | * and must be called after the cipher has been chosen because this may | |
3190 | * influence which certificate is sent | |
3191 | */ | |
3192 | if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) { | |
292bb568 | 3193 | int ret; |
ae5c8664 MC |
3194 | CERT_PKEY *certpkey; |
3195 | certpkey = ssl_get_server_send_pkey(s); | |
3196 | /* If no certificate can't return certificate status */ | |
292bb568 BK |
3197 | if (certpkey != NULL) { |
3198 | /* | |
3199 | * Set current certificate to one we will use so SSL_get_certificate | |
3200 | * et al can pick it up. | |
3201 | */ | |
3202 | s->cert->key = certpkey; | |
3203 | ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); | |
3204 | switch (ret) { | |
3205 | /* We don't want to send a status request response */ | |
3206 | case SSL_TLSEXT_ERR_NOACK: | |
ae5c8664 | 3207 | s->tlsext_status_expected = 0; |
292bb568 BK |
3208 | break; |
3209 | /* status request response should be sent */ | |
3210 | case SSL_TLSEXT_ERR_OK: | |
3211 | if (s->tlsext_ocsp_resp) | |
3212 | s->tlsext_status_expected = 1; | |
3213 | break; | |
3214 | /* something bad happened */ | |
3215 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
3216 | default: | |
3217 | *al = SSL_AD_INTERNAL_ERROR; | |
3218 | return 0; | |
3219 | } | |
ae5c8664 | 3220 | } |
af2db04c TS |
3221 | } |
3222 | ||
292bb568 BK |
3223 | if (!tls1_alpn_handle_client_hello_late(s, al)) { |
3224 | return 0; | |
ae5c8664 | 3225 | } |
292bb568 BK |
3226 | |
3227 | return 1; | |
ae5c8664 | 3228 | } |
da8512aa | 3229 | |
36ca4ba6 | 3230 | int ssl_check_serverhello_tlsext(SSL *s) |
ae5c8664 MC |
3231 | { |
3232 | int ret = SSL_TLSEXT_ERR_NOACK; | |
3233 | int al = SSL_AD_UNRECOGNIZED_NAME; | |
3234 | ||
3235 | # ifndef OPENSSL_NO_EC | |
3236 | /* | |
3237 | * If we are client and using an elliptic curve cryptography cipher | |
3238 | * suite, then if server returns an EC point formats lists extension it | |
3239 | * must contain uncompressed. | |
3240 | */ | |
3241 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
3242 | unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
3243 | if ((s->tlsext_ecpointformatlist != NULL) | |
3244 | && (s->tlsext_ecpointformatlist_length > 0) | |
3245 | && (s->session->tlsext_ecpointformatlist != NULL) | |
3246 | && (s->session->tlsext_ecpointformatlist_length > 0) | |
3247 | && ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) | |
3248 | || (alg_a & SSL_aECDSA))) { | |
3249 | /* we are using an ECC cipher */ | |
3250 | size_t i; | |
3251 | unsigned char *list; | |
3252 | int found_uncompressed = 0; | |
3253 | list = s->session->tlsext_ecpointformatlist; | |
3254 | for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) { | |
3255 | if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) { | |
3256 | found_uncompressed = 1; | |
3257 | break; | |
3258 | } | |
3259 | } | |
3260 | if (!found_uncompressed) { | |
3261 | SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT, | |
3262 | SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); | |
3263 | return -1; | |
3264 | } | |
3265 | } | |
3266 | ret = SSL_TLSEXT_ERR_OK; | |
3267 | # endif /* OPENSSL_NO_EC */ | |
3268 | ||
3269 | if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) | |
3270 | ret = | |
3271 | s->ctx->tlsext_servername_callback(s, &al, | |
3272 | s->ctx->tlsext_servername_arg); | |
3273 | else if (s->initial_ctx != NULL | |
3274 | && s->initial_ctx->tlsext_servername_callback != 0) | |
3275 | ret = | |
3276 | s->initial_ctx->tlsext_servername_callback(s, &al, | |
3277 | s-> | |
3278 | initial_ctx->tlsext_servername_arg); | |
3279 | ||
3280 | # ifdef TLSEXT_TYPE_opaque_prf_input | |
3281 | if (s->s3->server_opaque_prf_input_len > 0) { | |
3282 | /* | |
3283 | * This case may indicate that we, as a client, want to insist on | |
3284 | * using opaque PRF inputs. So first verify that we really have a | |
3285 | * value from the server too. | |
3286 | */ | |
3287 | ||
3288 | if (s->s3->server_opaque_prf_input == NULL) { | |
3289 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3290 | al = SSL_AD_HANDSHAKE_FAILURE; | |
3291 | } | |
241520e6 | 3292 | |
ae5c8664 MC |
3293 | /* |
3294 | * Anytime the server *has* sent an opaque PRF input, we need to | |
3295 | * check that we have a client opaque PRF input of the same size. | |
3296 | */ | |
3297 | if (s->s3->client_opaque_prf_input == NULL || | |
3298 | s->s3->client_opaque_prf_input_len != | |
3299 | s->s3->server_opaque_prf_input_len) { | |
3300 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3301 | al = SSL_AD_ILLEGAL_PARAMETER; | |
3302 | } | |
3303 | } | |
3304 | # endif | |
3305 | ||
905943af MC |
3306 | OPENSSL_free(s->tlsext_ocsp_resp); |
3307 | s->tlsext_ocsp_resp = NULL; | |
3308 | s->tlsext_ocsp_resplen = -1; | |
ae5c8664 MC |
3309 | /* |
3310 | * If we've requested certificate status and we wont get one tell the | |
3311 | * callback | |
3312 | */ | |
3313 | if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) | |
0ac62399 | 3314 | && !(s->hit) && s->ctx && s->ctx->tlsext_status_cb) { |
ae5c8664 MC |
3315 | int r; |
3316 | /* | |
905943af MC |
3317 | * Call callback with resp == NULL and resplen == -1 so callback |
3318 | * knows there is no response | |
ae5c8664 | 3319 | */ |
ae5c8664 MC |
3320 | r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); |
3321 | if (r == 0) { | |
3322 | al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; | |
3323 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3324 | } | |
3325 | if (r < 0) { | |
3326 | al = SSL_AD_INTERNAL_ERROR; | |
3327 | ret = SSL_TLSEXT_ERR_ALERT_FATAL; | |
3328 | } | |
3329 | } | |
3330 | ||
3331 | switch (ret) { | |
3332 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
3333 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
3334 | return -1; | |
3335 | ||
3336 | case SSL_TLSEXT_ERR_ALERT_WARNING: | |
3337 | ssl3_send_alert(s, SSL3_AL_WARNING, al); | |
3338 | return 1; | |
3339 | ||
3340 | case SSL_TLSEXT_ERR_NOACK: | |
3341 | s->servername_done = 0; | |
3342 | default: | |
3343 | return 1; | |
3344 | } | |
3345 | } | |
761772d7 | 3346 | |
ae5c8664 MC |
3347 | int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, |
3348 | int n) | |
3349 | { | |
3350 | int al = -1; | |
3351 | if (s->version < SSL3_VERSION) | |
3352 | return 1; | |
3353 | if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0) { | |
3354 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
3355 | return 0; | |
3356 | } | |
3357 | ||
3358 | if (ssl_check_serverhello_tlsext(s) <= 0) { | |
3359 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, SSL_R_SERVERHELLO_TLSEXT); | |
3360 | return 0; | |
3361 | } | |
3362 | return 1; | |
fe9ce2b7 DSH |
3363 | } |
3364 | ||
6977c7e2 TH |
3365 | /*- |
3366 | * Since the server cache lookup is done early on in the processing of the | |
3c3f0259 BM |
3367 | * ClientHello, and other operations depend on the result, we need to handle |
3368 | * any TLS session ticket extension at the same time. | |
3369 | * | |
3370 | * session_id: points at the session ID in the ClientHello. This code will | |
3371 | * read past the end of this in order to parse out the session ticket | |
3372 | * extension, if any. | |
3373 | * len: the length of the session ID. | |
3374 | * limit: a pointer to the first byte after the ClientHello. | |
3375 | * ret: (output) on return, if a ticket was decrypted, then this is set to | |
3376 | * point to the resulting session. | |
3377 | * | |
3378 | * If s->tls_session_secret_cb is set then we are expecting a pre-shared key | |
3379 | * ciphersuite, in which case we have no use for session tickets and one will | |
3380 | * never be decrypted, nor will s->tlsext_ticket_expected be set to 1. | |
3381 | * | |
3382 | * Returns: | |
3383 | * -1: fatal error, either from parsing or decrypting the ticket. | |
3384 | * 0: no ticket was found (or was ignored, based on settings). | |
3385 | * 1: a zero length extension was found, indicating that the client supports | |
3386 | * session tickets but doesn't currently have one to offer. | |
3387 | * 2: either s->tls_session_secret_cb was set, or a ticket was offered but | |
3388 | * couldn't be decrypted because of a non-fatal error. | |
3389 | * 3: a ticket was successfully decrypted and *ret was set. | |
3390 | * | |
3391 | * Side effects: | |
3392 | * Sets s->tlsext_ticket_expected to 1 if the server will have to issue | |
3393 | * a new session ticket to the client because the client indicated support | |
3394 | * (and s->tls_session_secret_cb is NULL) but the client either doesn't have | |
3395 | * a session ticket or we couldn't use the one it gave us, or if | |
3396 | * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket. | |
3397 | * Otherwise, s->tlsext_ticket_expected is set to 0. | |
6434abbf | 3398 | */ |
6434abbf | 3399 | int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, |
ae5c8664 MC |
3400 | const unsigned char *limit, SSL_SESSION **ret) |
3401 | { | |
3402 | /* Point after session ID in client hello */ | |
3403 | const unsigned char *p = session_id + len; | |
3404 | unsigned short i; | |
3405 | ||
3406 | *ret = NULL; | |
3407 | s->tlsext_ticket_expected = 0; | |
3408 | ||
3409 | /* | |
3410 | * If tickets disabled behave as if no ticket present to permit stateful | |
3411 | * resumption. | |
3412 | */ | |
3413 | if (SSL_get_options(s) & SSL_OP_NO_TICKET) | |
3414 | return 0; | |
3415 | if ((s->version <= SSL3_VERSION) || !limit) | |
3416 | return 0; | |
3417 | if (p >= limit) | |
3418 | return -1; | |
3419 | /* Skip past DTLS cookie */ | |
3420 | if (SSL_IS_DTLS(s)) { | |
3421 | i = *(p++); | |
a004e72b MC |
3422 | |
3423 | if (limit - p <= i) | |
ae5c8664 | 3424 | return -1; |
a004e72b MC |
3425 | |
3426 | p += i; | |
ae5c8664 MC |
3427 | } |
3428 | /* Skip past cipher list */ | |
3429 | n2s(p, i); | |
a004e72b | 3430 | if (limit - p <= i) |
ae5c8664 | 3431 | return -1; |
a004e72b MC |
3432 | p += i; |
3433 | ||
ae5c8664 MC |
3434 | /* Skip past compression algorithm list */ |
3435 | i = *(p++); | |
a004e72b | 3436 | if (limit - p < i) |
ae5c8664 | 3437 | return -1; |
a004e72b MC |
3438 | p += i; |
3439 | ||
ae5c8664 | 3440 | /* Now at start of extensions */ |
a004e72b | 3441 | if (limit - p <= 2) |
ae5c8664 MC |
3442 | return 0; |
3443 | n2s(p, i); | |
a004e72b | 3444 | while (limit - p >= 4) { |
ae5c8664 MC |
3445 | unsigned short type, size; |
3446 | n2s(p, type); | |
3447 | n2s(p, size); | |
a004e72b | 3448 | if (limit - p < size) |
ae5c8664 MC |
3449 | return 0; |
3450 | if (type == TLSEXT_TYPE_session_ticket) { | |
3451 | int r; | |
3452 | if (size == 0) { | |
3453 | /* | |
3454 | * The client will accept a ticket but doesn't currently have | |
3455 | * one. | |
3456 | */ | |
3457 | s->tlsext_ticket_expected = 1; | |
3458 | return 1; | |
3459 | } | |
3460 | if (s->tls_session_secret_cb) { | |
3461 | /* | |
3462 | * Indicate that the ticket couldn't be decrypted rather than | |
3463 | * generating the session from ticket now, trigger | |
3464 | * abbreviated handshake based on external mechanism to | |
3465 | * calculate the master secret later. | |
3466 | */ | |
3467 | return 2; | |
3468 | } | |
3469 | r = tls_decrypt_ticket(s, p, size, session_id, len, ret); | |
3470 | switch (r) { | |
3471 | case 2: /* ticket couldn't be decrypted */ | |
3472 | s->tlsext_ticket_expected = 1; | |
3473 | return 2; | |
3474 | case 3: /* ticket was decrypted */ | |
3475 | return r; | |
3476 | case 4: /* ticket decrypted but need to renew */ | |
3477 | s->tlsext_ticket_expected = 1; | |
3478 | return 3; | |
3479 | default: /* fatal error */ | |
3480 | return -1; | |
3481 | } | |
3482 | } | |
3483 | p += size; | |
3484 | } | |
3485 | return 0; | |
3486 | } | |
6434abbf | 3487 | |
6977c7e2 TH |
3488 | /*- |
3489 | * tls_decrypt_ticket attempts to decrypt a session ticket. | |
3c3f0259 BM |
3490 | * |
3491 | * etick: points to the body of the session ticket extension. | |
3492 | * eticklen: the length of the session tickets extenion. | |
3493 | * sess_id: points at the session ID. | |
3494 | * sesslen: the length of the session ID. | |
3495 | * psess: (output) on return, if a ticket was decrypted, then this is set to | |
3496 | * point to the resulting session. | |
3497 | * | |
3498 | * Returns: | |
3499 | * -1: fatal error, either from parsing or decrypting the ticket. | |
3500 | * 2: the ticket couldn't be decrypted. | |
3501 | * 3: a ticket was successfully decrypted and *psess was set. | |
3502 | * 4: same as 3, but the ticket needs to be renewed. | |
3503 | */ | |
ae5c8664 MC |
3504 | static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, |
3505 | int eticklen, const unsigned char *sess_id, | |
3506 | int sesslen, SSL_SESSION **psess) | |
3507 | { | |
3508 | SSL_SESSION *sess; | |
3509 | unsigned char *sdec; | |
3510 | const unsigned char *p; | |
3511 | int slen, mlen, renew_ticket = 0; | |
3512 | unsigned char tick_hmac[EVP_MAX_MD_SIZE]; | |
3513 | HMAC_CTX hctx; | |
3514 | EVP_CIPHER_CTX ctx; | |
3515 | SSL_CTX *tctx = s->initial_ctx; | |
baaabfd8 | 3516 | |
cb750375 MC |
3517 | /* Need at least keyname + iv */ |
3518 | if (eticklen < 16 + EVP_MAX_IV_LENGTH) | |
3519 | return 2; | |
3520 | ||
ae5c8664 MC |
3521 | /* Initialize session ticket encryption and HMAC contexts */ |
3522 | HMAC_CTX_init(&hctx); | |
3523 | EVP_CIPHER_CTX_init(&ctx); | |
3524 | if (tctx->tlsext_ticket_key_cb) { | |
3525 | unsigned char *nctick = (unsigned char *)etick; | |
3526 | int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, | |
3527 | &ctx, &hctx, 0); | |
3528 | if (rv < 0) | |
87489337 MRA |
3529 | goto err; |
3530 | if (rv == 0) { | |
3531 | HMAC_CTX_cleanup(&hctx); | |
3532 | EVP_CIPHER_CTX_cleanup(&ctx); | |
ae5c8664 | 3533 | return 2; |
87489337 | 3534 | } |
ae5c8664 MC |
3535 | if (rv == 2) |
3536 | renew_ticket = 1; | |
3537 | } else { | |
3538 | /* Check key name matches */ | |
3539 | if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) | |
3540 | return 2; | |
56d91346 MC |
3541 | if (HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
3542 | tlsext_tick_md(), NULL) <= 0 | |
3543 | || EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, | |
3544 | tctx->tlsext_tick_aes_key, | |
3545 | etick + 16) <= 0) { | |
3546 | goto err; | |
3547 | } | |
ae5c8664 MC |
3548 | } |
3549 | /* | |
3550 | * Attempt to process session ticket, first conduct sanity and integrity | |
3551 | * checks on ticket. | |
3552 | */ | |
3553 | mlen = HMAC_size(&hctx); | |
3554 | if (mlen < 0) { | |
56d91346 | 3555 | goto err; |
ae5c8664 | 3556 | } |
baaabfd8 DSH |
3557 | /* Sanity check ticket length: must exceed keyname + IV + HMAC */ |
3558 | if (eticklen <= 16 + EVP_CIPHER_CTX_iv_length(&ctx) + mlen) { | |
3559 | HMAC_CTX_cleanup(&hctx); | |
3560 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3561 | return 2; | |
3562 | } | |
3563 | ||
ae5c8664 MC |
3564 | eticklen -= mlen; |
3565 | /* Check HMAC of encrypted ticket */ | |
56d91346 MC |
3566 | if (HMAC_Update(&hctx, etick, eticklen) <= 0 |
3567 | || HMAC_Final(&hctx, tick_hmac, NULL) <= 0) { | |
3568 | goto err; | |
3569 | } | |
ae5c8664 MC |
3570 | HMAC_CTX_cleanup(&hctx); |
3571 | if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) { | |
3572 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3573 | return 2; | |
3574 | } | |
3575 | /* Attempt to decrypt session data */ | |
3576 | /* Move p after IV to start of encrypted ticket, update length */ | |
3577 | p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
3578 | eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); | |
3579 | sdec = OPENSSL_malloc(eticklen); | |
3b93479f MC |
3580 | if (sdec == NULL |
3581 | || EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen) <= 0) { | |
ae5c8664 | 3582 | EVP_CIPHER_CTX_cleanup(&ctx); |
3b93479f | 3583 | OPENSSL_free(sdec); |
ae5c8664 MC |
3584 | return -1; |
3585 | } | |
ae5c8664 MC |
3586 | if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) { |
3587 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3588 | OPENSSL_free(sdec); | |
3589 | return 2; | |
3590 | } | |
3591 | slen += mlen; | |
3592 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3593 | p = sdec; | |
3594 | ||
3595 | sess = d2i_SSL_SESSION(NULL, &p, slen); | |
5e90cb54 | 3596 | slen -= p - sdec; |
ae5c8664 MC |
3597 | OPENSSL_free(sdec); |
3598 | if (sess) { | |
1415d316 | 3599 | /* Some additional consistency checks */ |
5e90cb54 | 3600 | if (slen != 0 || sess->session_id_length != 0) { |
1415d316 BE |
3601 | SSL_SESSION_free(sess); |
3602 | return 2; | |
3603 | } | |
ae5c8664 MC |
3604 | /* |
3605 | * The session ID, if non-empty, is used by some clients to detect | |
3606 | * that the ticket has been accepted. So we copy it to the session | |
3607 | * structure. If it is empty set length to zero as required by | |
3608 | * standard. | |
3609 | */ | |
3610 | if (sesslen) | |
3611 | memcpy(sess->session_id, sess_id, sesslen); | |
3612 | sess->session_id_length = sesslen; | |
3613 | *psess = sess; | |
3614 | if (renew_ticket) | |
3615 | return 4; | |
3616 | else | |
3617 | return 3; | |
3618 | } | |
3619 | ERR_clear_error(); | |
3620 | /* | |
3621 | * For session parse failure, indicate that we need to send a new ticket. | |
3622 | */ | |
3623 | return 2; | |
56d91346 MC |
3624 | err: |
3625 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3626 | HMAC_CTX_cleanup(&hctx); | |
3627 | return -1; | |
ae5c8664 | 3628 | } |
6434abbf | 3629 | |
9472baae DSH |
3630 | /* Tables to translate from NIDs to TLS v1.2 ids */ |
3631 | ||
ae5c8664 MC |
3632 | typedef struct { |
3633 | int nid; | |
3634 | int id; | |
3635 | } tls12_lookup; | |
9472baae DSH |
3636 | |
3637 | static tls12_lookup tls12_md[] = { | |
ae5c8664 MC |
3638 | {NID_md5, TLSEXT_hash_md5}, |
3639 | {NID_sha1, TLSEXT_hash_sha1}, | |
3640 | {NID_sha224, TLSEXT_hash_sha224}, | |
3641 | {NID_sha256, TLSEXT_hash_sha256}, | |
3642 | {NID_sha384, TLSEXT_hash_sha384}, | |
3643 | {NID_sha512, TLSEXT_hash_sha512} | |
9472baae DSH |
3644 | }; |
3645 | ||
3646 | static tls12_lookup tls12_sig[] = { | |
ae5c8664 MC |
3647 | {EVP_PKEY_RSA, TLSEXT_signature_rsa}, |
3648 | {EVP_PKEY_DSA, TLSEXT_signature_dsa}, | |
3649 | {EVP_PKEY_EC, TLSEXT_signature_ecdsa} | |
9472baae DSH |
3650 | }; |
3651 | ||
3652 | static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen) | |
ae5c8664 MC |
3653 | { |
3654 | size_t i; | |
3655 | for (i = 0; i < tlen; i++) { | |
3656 | if (table[i].nid == nid) | |
3657 | return table[i].id; | |
3658 | } | |
3659 | return -1; | |
3660 | } | |
55058181 | 3661 | |
9472baae | 3662 | static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen) |
ae5c8664 MC |
3663 | { |
3664 | size_t i; | |
3665 | for (i = 0; i < tlen; i++) { | |
3666 | if ((table[i].id) == id) | |
3667 | return table[i].nid; | |
3668 | } | |
3669 | return NID_undef; | |
3670 | } | |
3671 | ||
3672 | int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, | |
3673 | const EVP_MD *md) | |
3674 | { | |
3675 | int sig_id, md_id; | |
3676 | if (!md) | |
3677 | return 0; | |
3678 | md_id = tls12_find_id(EVP_MD_type(md), tls12_md, | |
3679 | sizeof(tls12_md) / sizeof(tls12_lookup)); | |
3680 | if (md_id == -1) | |
3681 | return 0; | |
3682 | sig_id = tls12_get_sigid(pk); | |
3683 | if (sig_id == -1) | |
3684 | return 0; | |
3685 | p[0] = (unsigned char)md_id; | |
3686 | p[1] = (unsigned char)sig_id; | |
3687 | return 1; | |
3688 | } | |
9472baae DSH |
3689 | |
3690 | int tls12_get_sigid(const EVP_PKEY *pk) | |
ae5c8664 MC |
3691 | { |
3692 | return tls12_find_id(pk->type, tls12_sig, | |
3693 | sizeof(tls12_sig) / sizeof(tls12_lookup)); | |
3694 | } | |
9472baae DSH |
3695 | |
3696 | const EVP_MD *tls12_get_hash(unsigned char hash_alg) | |
ae5c8664 MC |
3697 | { |
3698 | switch (hash_alg) { | |
3699 | # ifndef OPENSSL_NO_MD5 | |
3700 | case TLSEXT_hash_md5: | |
3701 | # ifdef OPENSSL_FIPS | |
3702 | if (FIPS_mode()) | |
3703 | return NULL; | |
3704 | # endif | |
3705 | return EVP_md5(); | |
3706 | # endif | |
3707 | # ifndef OPENSSL_NO_SHA | |
3708 | case TLSEXT_hash_sha1: | |
3709 | return EVP_sha1(); | |
3710 | # endif | |
3711 | # ifndef OPENSSL_NO_SHA256 | |
3712 | case TLSEXT_hash_sha224: | |
3713 | return EVP_sha224(); | |
3714 | ||
3715 | case TLSEXT_hash_sha256: | |
3716 | return EVP_sha256(); | |
3717 | # endif | |
3718 | # ifndef OPENSSL_NO_SHA512 | |
3719 | case TLSEXT_hash_sha384: | |
3720 | return EVP_sha384(); | |
3721 | ||
3722 | case TLSEXT_hash_sha512: | |
3723 | return EVP_sha512(); | |
3724 | # endif | |
3725 | default: | |
3726 | return NULL; | |
3727 | ||
3728 | } | |
3729 | } | |
9472baae | 3730 | |
c70a1fee | 3731 | static int tls12_get_pkey_idx(unsigned char sig_alg) |
ae5c8664 MC |
3732 | { |
3733 | switch (sig_alg) { | |
3734 | # ifndef OPENSSL_NO_RSA | |
3735 | case TLSEXT_signature_rsa: | |
3736 | return SSL_PKEY_RSA_SIGN; | |
3737 | # endif | |
3738 | # ifndef OPENSSL_NO_DSA | |
3739 | case TLSEXT_signature_dsa: | |
3740 | return SSL_PKEY_DSA_SIGN; | |
3741 | # endif | |
3742 | # ifndef OPENSSL_NO_ECDSA | |
3743 | case TLSEXT_signature_ecdsa: | |
3744 | return SSL_PKEY_ECC; | |
3745 | # endif | |
3746 | } | |
3747 | return -1; | |
3748 | } | |
c70a1fee DSH |
3749 | |
3750 | /* Convert TLS 1.2 signature algorithm extension values into NIDs */ | |
3751 | static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid, | |
ae5c8664 MC |
3752 | int *psignhash_nid, const unsigned char *data) |
3753 | { | |
f4d1926f | 3754 | int sign_nid = NID_undef, hash_nid = NID_undef; |
ae5c8664 MC |
3755 | if (!phash_nid && !psign_nid && !psignhash_nid) |
3756 | return; | |
3757 | if (phash_nid || psignhash_nid) { | |
3758 | hash_nid = tls12_find_nid(data[0], tls12_md, | |
3759 | sizeof(tls12_md) / sizeof(tls12_lookup)); | |
3760 | if (phash_nid) | |
3761 | *phash_nid = hash_nid; | |
3762 | } | |
3763 | if (psign_nid || psignhash_nid) { | |
3764 | sign_nid = tls12_find_nid(data[1], tls12_sig, | |
3765 | sizeof(tls12_sig) / sizeof(tls12_lookup)); | |
3766 | if (psign_nid) | |
3767 | *psign_nid = sign_nid; | |
3768 | } | |
3769 | if (psignhash_nid) { | |
f4d1926f MC |
3770 | if (sign_nid == NID_undef || hash_nid == NID_undef |
3771 | || OBJ_find_sigid_by_algs(psignhash_nid, hash_nid, | |
3772 | sign_nid) <= 0) | |
ae5c8664 MC |
3773 | *psignhash_nid = NID_undef; |
3774 | } | |
3775 | } | |
3776 | ||
c70a1fee DSH |
3777 | /* Given preference and allowed sigalgs set shared sigalgs */ |
3778 | static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig, | |
ae5c8664 MC |
3779 | const unsigned char *pref, size_t preflen, |
3780 | const unsigned char *allow, | |
3781 | size_t allowlen) | |
3782 | { | |
3783 | const unsigned char *ptmp, *atmp; | |
3784 | size_t i, j, nmatch = 0; | |
3785 | for (i = 0, ptmp = pref; i < preflen; i += 2, ptmp += 2) { | |
3786 | /* Skip disabled hashes or signature algorithms */ | |
3787 | if (tls12_get_hash(ptmp[0]) == NULL) | |
3788 | continue; | |
3789 | if (tls12_get_pkey_idx(ptmp[1]) == -1) | |
3790 | continue; | |
3791 | for (j = 0, atmp = allow; j < allowlen; j += 2, atmp += 2) { | |
3792 | if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1]) { | |
3793 | nmatch++; | |
3794 | if (shsig) { | |
3795 | shsig->rhash = ptmp[0]; | |
3796 | shsig->rsign = ptmp[1]; | |
3797 | tls1_lookup_sigalg(&shsig->hash_nid, | |
3798 | &shsig->sign_nid, | |
3799 | &shsig->signandhash_nid, ptmp); | |
3800 | shsig++; | |
3801 | } | |
3802 | break; | |
3803 | } | |
3804 | } | |
3805 | } | |
3806 | return nmatch; | |
3807 | } | |
c70a1fee DSH |
3808 | |
3809 | /* Set shared signature algorithms for SSL structures */ | |
3810 | static int tls1_set_shared_sigalgs(SSL *s) | |
ae5c8664 MC |
3811 | { |
3812 | const unsigned char *pref, *allow, *conf; | |
3813 | size_t preflen, allowlen, conflen; | |
3814 | size_t nmatch; | |
3815 | TLS_SIGALGS *salgs = NULL; | |
3816 | CERT *c = s->cert; | |
3817 | unsigned int is_suiteb = tls1_suiteb(s); | |
3818 | if (c->shared_sigalgs) { | |
3819 | OPENSSL_free(c->shared_sigalgs); | |
3820 | c->shared_sigalgs = NULL; | |
76343947 | 3821 | c->shared_sigalgslen = 0; |
ae5c8664 MC |
3822 | } |
3823 | /* If client use client signature algorithms if not NULL */ | |
3824 | if (!s->server && c->client_sigalgs && !is_suiteb) { | |
3825 | conf = c->client_sigalgs; | |
3826 | conflen = c->client_sigalgslen; | |
3827 | } else if (c->conf_sigalgs && !is_suiteb) { | |
3828 | conf = c->conf_sigalgs; | |
3829 | conflen = c->conf_sigalgslen; | |
3830 | } else | |
e93f7d9c | 3831 | conflen = tls12_get_psigalgs(s, 0, &conf); |
ae5c8664 MC |
3832 | if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) { |
3833 | pref = conf; | |
3834 | preflen = conflen; | |
3835 | allow = c->peer_sigalgs; | |
3836 | allowlen = c->peer_sigalgslen; | |
3837 | } else { | |
3838 | allow = conf; | |
3839 | allowlen = conflen; | |
3840 | pref = c->peer_sigalgs; | |
3841 | preflen = c->peer_sigalgslen; | |
3842 | } | |
3843 | nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen); | |
76343947 DSH |
3844 | if (nmatch) { |
3845 | salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS)); | |
3846 | if (!salgs) | |
3847 | return 0; | |
3848 | nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen); | |
3849 | } else { | |
3850 | salgs = NULL; | |
3851 | } | |
ae5c8664 MC |
3852 | c->shared_sigalgs = salgs; |
3853 | c->shared_sigalgslen = nmatch; | |
3854 | return 1; | |
3855 | } | |
c70a1fee | 3856 | |
9472baae DSH |
3857 | /* Set preferred digest for each key type */ |
3858 | ||
51695b98 | 3859 | int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize) |
ae5c8664 MC |
3860 | { |
3861 | CERT *c = s->cert; | |
3862 | /* Extension ignored for inappropriate versions */ | |
3863 | if (!SSL_USE_SIGALGS(s)) | |
3864 | return 1; | |
3865 | /* Should never happen */ | |
3866 | if (!c) | |
3867 | return 0; | |
3868 | ||
3869 | if (c->peer_sigalgs) | |
3870 | OPENSSL_free(c->peer_sigalgs); | |
3871 | c->peer_sigalgs = OPENSSL_malloc(dsize); | |
3872 | if (!c->peer_sigalgs) | |
3873 | return 0; | |
3874 | c->peer_sigalgslen = dsize; | |
3875 | memcpy(c->peer_sigalgs, data, dsize); | |
3876 | return 1; | |
3877 | } | |
9472baae | 3878 | |
51695b98 | 3879 | int tls1_process_sigalgs(SSL *s) |
ae5c8664 MC |
3880 | { |
3881 | int idx; | |
3882 | size_t i; | |
3883 | const EVP_MD *md; | |
3884 | CERT *c = s->cert; | |
3885 | TLS_SIGALGS *sigptr; | |
3886 | if (!tls1_set_shared_sigalgs(s)) | |
3887 | return 0; | |
3888 | ||
3889 | # ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL | |
3890 | if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL) { | |
3891 | /* | |
3892 | * Use first set signature preference to force message digest, | |
3893 | * ignoring any peer preferences. | |
3894 | */ | |
3895 | const unsigned char *sigs = NULL; | |
3896 | if (s->server) | |
3897 | sigs = c->conf_sigalgs; | |
3898 | else | |
3899 | sigs = c->client_sigalgs; | |
3900 | if (sigs) { | |
3901 | idx = tls12_get_pkey_idx(sigs[1]); | |
3902 | md = tls12_get_hash(sigs[0]); | |
3903 | c->pkeys[idx].digest = md; | |
3904 | c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN; | |
3905 | if (idx == SSL_PKEY_RSA_SIGN) { | |
3906 | c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = | |
3907 | CERT_PKEY_EXPLICIT_SIGN; | |
3908 | c->pkeys[SSL_PKEY_RSA_ENC].digest = md; | |
3909 | } | |
3910 | } | |
3911 | } | |
3912 | # endif | |
3913 | ||
3914 | for (i = 0, sigptr = c->shared_sigalgs; | |
3915 | i < c->shared_sigalgslen; i++, sigptr++) { | |
3916 | idx = tls12_get_pkey_idx(sigptr->rsign); | |
3917 | if (idx > 0 && c->pkeys[idx].digest == NULL) { | |
3918 | md = tls12_get_hash(sigptr->rhash); | |
3919 | c->pkeys[idx].digest = md; | |
3920 | c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN; | |
3921 | if (idx == SSL_PKEY_RSA_SIGN) { | |
3922 | c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = | |
3923 | CERT_PKEY_EXPLICIT_SIGN; | |
3924 | c->pkeys[SSL_PKEY_RSA_ENC].digest = md; | |
3925 | } | |
3926 | } | |
9472baae | 3927 | |
ae5c8664 MC |
3928 | } |
3929 | /* | |
3930 | * In strict mode leave unset digests as NULL to indicate we can't use | |
3931 | * the certificate for signing. | |
3932 | */ | |
3933 | if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)) { | |
3934 | /* | |
3935 | * Set any remaining keys to default values. NOTE: if alg is not | |
3936 | * supported it stays as NULL. | |
3937 | */ | |
3938 | # ifndef OPENSSL_NO_DSA | |
3939 | if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest) | |
3940 | c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1(); | |
3941 | # endif | |
3942 | # ifndef OPENSSL_NO_RSA | |
3943 | if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) { | |
3944 | c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1(); | |
3945 | c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1(); | |
3946 | } | |
3947 | # endif | |
3948 | # ifndef OPENSSL_NO_ECDSA | |
3949 | if (!c->pkeys[SSL_PKEY_ECC].digest) | |
3950 | c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1(); | |
3951 | # endif | |
3952 | } | |
3953 | return 1; | |
3954 | } | |
bd6941cf | 3955 | |
55058181 | 3956 | int SSL_get_sigalgs(SSL *s, int idx, |
ae5c8664 MC |
3957 | int *psign, int *phash, int *psignhash, |
3958 | unsigned char *rsig, unsigned char *rhash) | |
3959 | { | |
3960 | const unsigned char *psig = s->cert->peer_sigalgs; | |
3961 | if (psig == NULL) | |
3962 | return 0; | |
3963 | if (idx >= 0) { | |
3964 | idx <<= 1; | |
3965 | if (idx >= (int)s->cert->peer_sigalgslen) | |
3966 | return 0; | |
3967 | psig += idx; | |
3968 | if (rhash) | |
3969 | *rhash = psig[0]; | |
3970 | if (rsig) | |
3971 | *rsig = psig[1]; | |
3972 | tls1_lookup_sigalg(phash, psign, psignhash, psig); | |
3973 | } | |
3974 | return s->cert->peer_sigalgslen / 2; | |
3975 | } | |
c70a1fee DSH |
3976 | |
3977 | int SSL_get_shared_sigalgs(SSL *s, int idx, | |
ae5c8664 MC |
3978 | int *psign, int *phash, int *psignhash, |
3979 | unsigned char *rsig, unsigned char *rhash) | |
3980 | { | |
3981 | TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs; | |
3982 | if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen) | |
3983 | return 0; | |
3984 | shsigalgs += idx; | |
3985 | if (phash) | |
3986 | *phash = shsigalgs->hash_nid; | |
3987 | if (psign) | |
3988 | *psign = shsigalgs->sign_nid; | |
3989 | if (psignhash) | |
3990 | *psignhash = shsigalgs->signandhash_nid; | |
3991 | if (rsig) | |
3992 | *rsig = shsigalgs->rsign; | |
3993 | if (rhash) | |
3994 | *rhash = shsigalgs->rhash; | |
3995 | return s->cert->shared_sigalgslen; | |
3996 | } | |
3997 | ||
3998 | # ifndef OPENSSL_NO_HEARTBEATS | |
3999 | int tls1_process_heartbeat(SSL *s) | |
4000 | { | |
4001 | unsigned char *p = &s->s3->rrec.data[0], *pl; | |
4002 | unsigned short hbtype; | |
4003 | unsigned int payload; | |
4004 | unsigned int padding = 16; /* Use minimum padding */ | |
4005 | ||
4006 | if (s->msg_callback) | |
4007 | s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT, | |
4008 | &s->s3->rrec.data[0], s->s3->rrec.length, | |
4009 | s, s->msg_callback_arg); | |
4010 | ||
4011 | /* Read type and payload length first */ | |
4012 | if (1 + 2 + 16 > s->s3->rrec.length) | |
4013 | return 0; /* silently discard */ | |
4014 | hbtype = *p++; | |
4015 | n2s(p, payload); | |
4016 | if (1 + 2 + payload + 16 > s->s3->rrec.length) | |
4017 | return 0; /* silently discard per RFC 6520 sec. 4 */ | |
4018 | pl = p; | |
4019 | ||
4020 | if (hbtype == TLS1_HB_REQUEST) { | |
4021 | unsigned char *buffer, *bp; | |
4022 | int r; | |
4023 | ||
4024 | /* | |
4025 | * Allocate memory for the response, size is 1 bytes message type, | |
4026 | * plus 2 bytes payload length, plus payload, plus padding | |
4027 | */ | |
4028 | buffer = OPENSSL_malloc(1 + 2 + payload + padding); | |
04d5242c MC |
4029 | if (buffer == NULL) |
4030 | return -1; | |
ae5c8664 MC |
4031 | bp = buffer; |
4032 | ||
4033 | /* Enter response type, length and copy payload */ | |
4034 | *bp++ = TLS1_HB_RESPONSE; | |
4035 | s2n(payload, bp); | |
4036 | memcpy(bp, pl, payload); | |
4037 | bp += payload; | |
4038 | /* Random padding */ | |
ad64a69e | 4039 | if (RAND_bytes(bp, padding) <= 0) { |
8f8e4e4f MC |
4040 | OPENSSL_free(buffer); |
4041 | return -1; | |
4042 | } | |
ae5c8664 MC |
4043 | |
4044 | r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, | |
4045 | 3 + payload + padding); | |
4046 | ||
4047 | if (r >= 0 && s->msg_callback) | |
4048 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
4049 | buffer, 3 + payload + padding, | |
4050 | s, s->msg_callback_arg); | |
4051 | ||
4052 | OPENSSL_free(buffer); | |
4053 | ||
4054 | if (r < 0) | |
4055 | return r; | |
4056 | } else if (hbtype == TLS1_HB_RESPONSE) { | |
4057 | unsigned int seq; | |
4058 | ||
4059 | /* | |
4060 | * We only send sequence numbers (2 bytes unsigned int), and 16 | |
4061 | * random bytes, so we just try to read the sequence number | |
4062 | */ | |
4063 | n2s(pl, seq); | |
4064 | ||
4065 | if (payload == 18 && seq == s->tlsext_hb_seq) { | |
4066 | s->tlsext_hb_seq++; | |
4067 | s->tlsext_hb_pending = 0; | |
4068 | } | |
4069 | } | |
4070 | ||
4071 | return 0; | |
4072 | } | |
4073 | ||
4074 | int tls1_heartbeat(SSL *s) | |
4075 | { | |
4076 | unsigned char *buf, *p; | |
8f8e4e4f | 4077 | int ret = -1; |
ae5c8664 MC |
4078 | unsigned int payload = 18; /* Sequence number + random bytes */ |
4079 | unsigned int padding = 16; /* Use minimum padding */ | |
4080 | ||
4081 | /* Only send if peer supports and accepts HB requests... */ | |
4082 | if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) || | |
4083 | s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) { | |
4084 | SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT); | |
4085 | return -1; | |
4086 | } | |
4087 | ||
4088 | /* ...and there is none in flight yet... */ | |
4089 | if (s->tlsext_hb_pending) { | |
4090 | SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING); | |
4091 | return -1; | |
4092 | } | |
4093 | ||
4094 | /* ...and no handshake in progress. */ | |
4095 | if (SSL_in_init(s) || s->in_handshake) { | |
4096 | SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE); | |
4097 | return -1; | |
4098 | } | |
4099 | ||
4100 | /* | |
4101 | * Check if padding is too long, payload and padding must not exceed 2^14 | |
4102 | * - 3 = 16381 bytes in total. | |
4103 | */ | |
4104 | OPENSSL_assert(payload + padding <= 16381); | |
4105 | ||
83975c80 MC |
4106 | /*- |
4107 | * Create HeartBeat message, we just use a sequence number | |
4108 | * as payload to distuingish different messages and add | |
4109 | * some random stuff. | |
4110 | * - Message Type, 1 byte | |
4111 | * - Payload Length, 2 bytes (unsigned int) | |
4112 | * - Payload, the sequence number (2 bytes uint) | |
4113 | * - Payload, random bytes (16 bytes uint) | |
4114 | * - Padding | |
4115 | */ | |
ae5c8664 | 4116 | buf = OPENSSL_malloc(1 + 2 + payload + padding); |
a03f81f4 RS |
4117 | if (buf == NULL) |
4118 | return -1; | |
ae5c8664 MC |
4119 | p = buf; |
4120 | /* Message Type */ | |
4121 | *p++ = TLS1_HB_REQUEST; | |
4122 | /* Payload length (18 bytes here) */ | |
4123 | s2n(payload, p); | |
4124 | /* Sequence number */ | |
4125 | s2n(s->tlsext_hb_seq, p); | |
4126 | /* 16 random bytes */ | |
ad64a69e | 4127 | if (RAND_bytes(p, 16) <= 0) { |
8f8e4e4f MC |
4128 | SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR); |
4129 | goto err; | |
4130 | } | |
ae5c8664 MC |
4131 | p += 16; |
4132 | /* Random padding */ | |
ad64a69e | 4133 | if (RAND_bytes(p, padding) <= 0) { |
8f8e4e4f MC |
4134 | SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR); |
4135 | goto err; | |
4136 | } | |
ae5c8664 MC |
4137 | |
4138 | ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding); | |
4139 | if (ret >= 0) { | |
4140 | if (s->msg_callback) | |
4141 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
4142 | buf, 3 + payload + padding, | |
4143 | s, s->msg_callback_arg); | |
4144 | ||
4145 | s->tlsext_hb_pending = 1; | |
4146 | } | |
4147 | ||
8f8e4e4f | 4148 | err: |
ae5c8664 MC |
4149 | OPENSSL_free(buf); |
4150 | ||
4151 | return ret; | |
4152 | } | |
4153 | # endif | |
0b362de5 | 4154 | |
ae5c8664 | 4155 | # define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2) |
0b362de5 | 4156 | |
ae5c8664 MC |
4157 | typedef struct { |
4158 | size_t sigalgcnt; | |
4159 | int sigalgs[MAX_SIGALGLEN]; | |
4160 | } sig_cb_st; | |
0b362de5 DSH |
4161 | |
4162 | static int sig_cb(const char *elem, int len, void *arg) | |
ae5c8664 MC |
4163 | { |
4164 | sig_cb_st *sarg = arg; | |
4165 | size_t i; | |
4166 | char etmp[20], *p; | |
4167 | int sig_alg, hash_alg; | |
63c1d16b KR |
4168 | if (elem == NULL) |
4169 | return 0; | |
ae5c8664 MC |
4170 | if (sarg->sigalgcnt == MAX_SIGALGLEN) |
4171 | return 0; | |
4172 | if (len > (int)(sizeof(etmp) - 1)) | |
4173 | return 0; | |
4174 | memcpy(etmp, elem, len); | |
4175 | etmp[len] = 0; | |
4176 | p = strchr(etmp, '+'); | |
4177 | if (!p) | |
4178 | return 0; | |
4179 | *p = 0; | |
4180 | p++; | |
4181 | if (!*p) | |
4182 | return 0; | |
4183 | ||
4184 | if (!strcmp(etmp, "RSA")) | |
4185 | sig_alg = EVP_PKEY_RSA; | |
4186 | else if (!strcmp(etmp, "DSA")) | |
4187 | sig_alg = EVP_PKEY_DSA; | |
4188 | else if (!strcmp(etmp, "ECDSA")) | |
4189 | sig_alg = EVP_PKEY_EC; | |
4190 | else | |
4191 | return 0; | |
4192 | ||
4193 | hash_alg = OBJ_sn2nid(p); | |
4194 | if (hash_alg == NID_undef) | |
4195 | hash_alg = OBJ_ln2nid(p); | |
4196 | if (hash_alg == NID_undef) | |
4197 | return 0; | |
4198 | ||
4199 | for (i = 0; i < sarg->sigalgcnt; i += 2) { | |
4200 | if (sarg->sigalgs[i] == sig_alg && sarg->sigalgs[i + 1] == hash_alg) | |
4201 | return 0; | |
4202 | } | |
4203 | sarg->sigalgs[sarg->sigalgcnt++] = hash_alg; | |
4204 | sarg->sigalgs[sarg->sigalgcnt++] = sig_alg; | |
4205 | return 1; | |
4206 | } | |
4207 | ||
4208 | /* | |
4209 | * Set suppored signature algorithms based on a colon separated list of the | |
4210 | * form sig+hash e.g. RSA+SHA512:DSA+SHA512 | |
4211 | */ | |
04c32cdd | 4212 | int tls1_set_sigalgs_list(CERT *c, const char *str, int client) |
ae5c8664 MC |
4213 | { |
4214 | sig_cb_st sig; | |
4215 | sig.sigalgcnt = 0; | |
4216 | if (!CONF_parse_list(str, ':', 1, sig_cb, &sig)) | |
4217 | return 0; | |
4218 | if (c == NULL) | |
4219 | return 1; | |
4220 | return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client); | |
4221 | } | |
4222 | ||
4223 | int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, | |
4224 | int client) | |
4225 | { | |
4226 | unsigned char *sigalgs, *sptr; | |
4227 | int rhash, rsign; | |
4228 | size_t i; | |
4229 | if (salglen & 1) | |
4230 | return 0; | |
4231 | sigalgs = OPENSSL_malloc(salglen); | |
4232 | if (sigalgs == NULL) | |
4233 | return 0; | |
4234 | for (i = 0, sptr = sigalgs; i < salglen; i += 2) { | |
4235 | rhash = tls12_find_id(*psig_nids++, tls12_md, | |
4236 | sizeof(tls12_md) / sizeof(tls12_lookup)); | |
4237 | rsign = tls12_find_id(*psig_nids++, tls12_sig, | |
4238 | sizeof(tls12_sig) / sizeof(tls12_lookup)); | |
4239 | ||
4240 | if (rhash == -1 || rsign == -1) | |
4241 | goto err; | |
4242 | *sptr++ = rhash; | |
4243 | *sptr++ = rsign; | |
4244 | } | |
4245 | ||
4246 | if (client) { | |
4247 | if (c->client_sigalgs) | |
4248 | OPENSSL_free(c->client_sigalgs); | |
4249 | c->client_sigalgs = sigalgs; | |
4250 | c->client_sigalgslen = salglen; | |
4251 | } else { | |
4252 | if (c->conf_sigalgs) | |
4253 | OPENSSL_free(c->conf_sigalgs); | |
4254 | c->conf_sigalgs = sigalgs; | |
4255 | c->conf_sigalgslen = salglen; | |
4256 | } | |
4257 | ||
4258 | return 1; | |
4259 | ||
4260 | err: | |
4261 | OPENSSL_free(sigalgs); | |
4262 | return 0; | |
4263 | } | |
c70a1fee | 4264 | |
484f8762 | 4265 | static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid) |
ae5c8664 MC |
4266 | { |
4267 | int sig_nid; | |
4268 | size_t i; | |
4269 | if (default_nid == -1) | |
4270 | return 1; | |
4271 | sig_nid = X509_get_signature_nid(x); | |
4272 | if (default_nid) | |
4273 | return sig_nid == default_nid ? 1 : 0; | |
4274 | for (i = 0; i < c->shared_sigalgslen; i++) | |
4275 | if (sig_nid == c->shared_sigalgs[i].signandhash_nid) | |
4276 | return 1; | |
4277 | return 0; | |
4278 | } | |
4279 | ||
6660baee DSH |
4280 | /* Check to see if a certificate issuer name matches list of CA names */ |
4281 | static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x) | |
ae5c8664 MC |
4282 | { |
4283 | X509_NAME *nm; | |
4284 | int i; | |
4285 | nm = X509_get_issuer_name(x); | |
4286 | for (i = 0; i < sk_X509_NAME_num(names); i++) { | |
4287 | if (!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i))) | |
4288 | return 1; | |
4289 | } | |
4290 | return 0; | |
4291 | } | |
4292 | ||
4293 | /* | |
4294 | * Check certificate chain is consistent with TLS extensions and is usable by | |
4295 | * server. This servers two purposes: it allows users to check chains before | |
4296 | * passing them to the server and it allows the server to check chains before | |
4297 | * attempting to use them. | |
484f8762 | 4298 | */ |
6660baee DSH |
4299 | |
4300 | /* Flags which need to be set for a certificate when stict mode not set */ | |
4301 | ||
ae5c8664 MC |
4302 | # define CERT_PKEY_VALID_FLAGS \ |
4303 | (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM) | |
6660baee | 4304 | /* Strict mode flags */ |
ae5c8664 MC |
4305 | # define CERT_PKEY_STRICT_FLAGS \ |
4306 | (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \ | |
4307 | | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE) | |
6660baee | 4308 | |
484f8762 | 4309 | int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain, |
ae5c8664 MC |
4310 | int idx) |
4311 | { | |
4312 | int i; | |
4313 | int rv = 0; | |
4314 | int check_flags = 0, strict_mode; | |
4315 | CERT_PKEY *cpk = NULL; | |
4316 | CERT *c = s->cert; | |
4317 | unsigned int suiteb_flags = tls1_suiteb(s); | |
4318 | /* idx == -1 means checking server chains */ | |
4319 | if (idx != -1) { | |
4320 | /* idx == -2 means checking client certificate chains */ | |
4321 | if (idx == -2) { | |
4322 | cpk = c->key; | |
4323 | idx = cpk - c->pkeys; | |
4324 | } else | |
4325 | cpk = c->pkeys + idx; | |
4326 | x = cpk->x509; | |
4327 | pk = cpk->privatekey; | |
4328 | chain = cpk->chain; | |
4329 | strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT; | |
4330 | /* If no cert or key, forget it */ | |
4331 | if (!x || !pk) | |
4332 | goto end; | |
4333 | # ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL | |
4334 | /* Allow any certificate to pass test */ | |
4335 | if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL) { | |
4336 | rv = CERT_PKEY_STRICT_FLAGS | CERT_PKEY_EXPLICIT_SIGN | | |
4337 | CERT_PKEY_VALID | CERT_PKEY_SIGN; | |
4338 | cpk->valid_flags = rv; | |
4339 | return rv; | |
4340 | } | |
4341 | # endif | |
4342 | } else { | |
4343 | if (!x || !pk) | |
327de270 | 4344 | return 0; |
ae5c8664 MC |
4345 | idx = ssl_cert_type(x, pk); |
4346 | if (idx == -1) | |
327de270 | 4347 | return 0; |
ae5c8664 MC |
4348 | cpk = c->pkeys + idx; |
4349 | if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT) | |
4350 | check_flags = CERT_PKEY_STRICT_FLAGS; | |
4351 | else | |
4352 | check_flags = CERT_PKEY_VALID_FLAGS; | |
4353 | strict_mode = 1; | |
4354 | } | |
4355 | ||
4356 | if (suiteb_flags) { | |
4357 | int ok; | |
4358 | if (check_flags) | |
4359 | check_flags |= CERT_PKEY_SUITEB; | |
4360 | ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags); | |
4361 | if (ok == X509_V_OK) | |
4362 | rv |= CERT_PKEY_SUITEB; | |
4363 | else if (!check_flags) | |
4364 | goto end; | |
4365 | } | |
4366 | ||
4367 | /* | |
4368 | * Check all signature algorithms are consistent with signature | |
4369 | * algorithms extension if TLS 1.2 or later and strict mode. | |
4370 | */ | |
4371 | if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode) { | |
4372 | int default_nid; | |
4373 | unsigned char rsign = 0; | |
4374 | if (c->peer_sigalgs) | |
4375 | default_nid = 0; | |
4376 | /* If no sigalgs extension use defaults from RFC5246 */ | |
4377 | else { | |
4378 | switch (idx) { | |
4379 | case SSL_PKEY_RSA_ENC: | |
4380 | case SSL_PKEY_RSA_SIGN: | |
4381 | case SSL_PKEY_DH_RSA: | |
4382 | rsign = TLSEXT_signature_rsa; | |
4383 | default_nid = NID_sha1WithRSAEncryption; | |
4384 | break; | |
4385 | ||
4386 | case SSL_PKEY_DSA_SIGN: | |
4387 | case SSL_PKEY_DH_DSA: | |
4388 | rsign = TLSEXT_signature_dsa; | |
4389 | default_nid = NID_dsaWithSHA1; | |
4390 | break; | |
4391 | ||
4392 | case SSL_PKEY_ECC: | |
4393 | rsign = TLSEXT_signature_ecdsa; | |
4394 | default_nid = NID_ecdsa_with_SHA1; | |
4395 | break; | |
4396 | ||
4397 | default: | |
4398 | default_nid = -1; | |
4399 | break; | |
4400 | } | |
4401 | } | |
4402 | /* | |
4403 | * If peer sent no signature algorithms extension and we have set | |
4404 | * preferred signature algorithms check we support sha1. | |
4405 | */ | |
4406 | if (default_nid > 0 && c->conf_sigalgs) { | |
4407 | size_t j; | |
4408 | const unsigned char *p = c->conf_sigalgs; | |
4409 | for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2) { | |
4410 | if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign) | |
4411 | break; | |
4412 | } | |
4413 | if (j == c->conf_sigalgslen) { | |
4414 | if (check_flags) | |
4415 | goto skip_sigs; | |
4416 | else | |
4417 | goto end; | |
4418 | } | |
4419 | } | |
4420 | /* Check signature algorithm of each cert in chain */ | |
4421 | if (!tls1_check_sig_alg(c, x, default_nid)) { | |
4422 | if (!check_flags) | |
4423 | goto end; | |
4424 | } else | |
4425 | rv |= CERT_PKEY_EE_SIGNATURE; | |
4426 | rv |= CERT_PKEY_CA_SIGNATURE; | |
4427 | for (i = 0; i < sk_X509_num(chain); i++) { | |
4428 | if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) { | |
4429 | if (check_flags) { | |
4430 | rv &= ~CERT_PKEY_CA_SIGNATURE; | |
4431 | break; | |
4432 | } else | |
4433 | goto end; | |
4434 | } | |
4435 | } | |
4436 | } | |
4437 | /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */ | |
4438 | else if (check_flags) | |
4439 | rv |= CERT_PKEY_EE_SIGNATURE | CERT_PKEY_CA_SIGNATURE; | |
4440 | skip_sigs: | |
4441 | /* Check cert parameters are consistent */ | |
4442 | if (tls1_check_cert_param(s, x, check_flags ? 1 : 2)) | |
4443 | rv |= CERT_PKEY_EE_PARAM; | |
4444 | else if (!check_flags) | |
4445 | goto end; | |
4446 | if (!s->server) | |
4447 | rv |= CERT_PKEY_CA_PARAM; | |
4448 | /* In strict mode check rest of chain too */ | |
4449 | else if (strict_mode) { | |
4450 | rv |= CERT_PKEY_CA_PARAM; | |
4451 | for (i = 0; i < sk_X509_num(chain); i++) { | |
4452 | X509 *ca = sk_X509_value(chain, i); | |
4453 | if (!tls1_check_cert_param(s, ca, 0)) { | |
4454 | if (check_flags) { | |
4455 | rv &= ~CERT_PKEY_CA_PARAM; | |
4456 | break; | |
4457 | } else | |
4458 | goto end; | |
4459 | } | |
4460 | } | |
4461 | } | |
4462 | if (!s->server && strict_mode) { | |
4463 | STACK_OF(X509_NAME) *ca_dn; | |
4464 | int check_type = 0; | |
4465 | switch (pk->type) { | |
4466 | case EVP_PKEY_RSA: | |
4467 | check_type = TLS_CT_RSA_SIGN; | |
4468 | break; | |
4469 | case EVP_PKEY_DSA: | |
4470 | check_type = TLS_CT_DSS_SIGN; | |
4471 | break; | |
4472 | case EVP_PKEY_EC: | |
4473 | check_type = TLS_CT_ECDSA_SIGN; | |
4474 | break; | |
4475 | case EVP_PKEY_DH: | |
4476 | case EVP_PKEY_DHX: | |
4477 | { | |
4478 | int cert_type = X509_certificate_type(x, pk); | |
4479 | if (cert_type & EVP_PKS_RSA) | |
4480 | check_type = TLS_CT_RSA_FIXED_DH; | |
4481 | if (cert_type & EVP_PKS_DSA) | |
4482 | check_type = TLS_CT_DSS_FIXED_DH; | |
4483 | } | |
4484 | } | |
4485 | if (check_type) { | |
4486 | const unsigned char *ctypes; | |
4487 | int ctypelen; | |
4488 | if (c->ctypes) { | |
4489 | ctypes = c->ctypes; | |
4490 | ctypelen = (int)c->ctype_num; | |
4491 | } else { | |
4492 | ctypes = (unsigned char *)s->s3->tmp.ctype; | |
4493 | ctypelen = s->s3->tmp.ctype_num; | |
4494 | } | |
4495 | for (i = 0; i < ctypelen; i++) { | |
4496 | if (ctypes[i] == check_type) { | |
4497 | rv |= CERT_PKEY_CERT_TYPE; | |
4498 | break; | |
4499 | } | |
4500 | } | |
4501 | if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags) | |
4502 | goto end; | |
4503 | } else | |
4504 | rv |= CERT_PKEY_CERT_TYPE; | |
4505 | ||
4506 | ca_dn = s->s3->tmp.ca_names; | |
4507 | ||
4508 | if (!sk_X509_NAME_num(ca_dn)) | |
4509 | rv |= CERT_PKEY_ISSUER_NAME; | |
4510 | ||
4511 | if (!(rv & CERT_PKEY_ISSUER_NAME)) { | |
4512 | if (ssl_check_ca_name(ca_dn, x)) | |
4513 | rv |= CERT_PKEY_ISSUER_NAME; | |
4514 | } | |
4515 | if (!(rv & CERT_PKEY_ISSUER_NAME)) { | |
4516 | for (i = 0; i < sk_X509_num(chain); i++) { | |
4517 | X509 *xtmp = sk_X509_value(chain, i); | |
4518 | if (ssl_check_ca_name(ca_dn, xtmp)) { | |
4519 | rv |= CERT_PKEY_ISSUER_NAME; | |
4520 | break; | |
4521 | } | |
4522 | } | |
4523 | } | |
4524 | if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME)) | |
4525 | goto end; | |
4526 | } else | |
4527 | rv |= CERT_PKEY_ISSUER_NAME | CERT_PKEY_CERT_TYPE; | |
4528 | ||
4529 | if (!check_flags || (rv & check_flags) == check_flags) | |
4530 | rv |= CERT_PKEY_VALID; | |
4531 | ||
4532 | end: | |
4533 | ||
4534 | if (TLS1_get_version(s) >= TLS1_2_VERSION) { | |
4535 | if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN) | |
4536 | rv |= CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN; | |
4537 | else if (cpk->digest) | |
4538 | rv |= CERT_PKEY_SIGN; | |
4539 | } else | |
4540 | rv |= CERT_PKEY_SIGN | CERT_PKEY_EXPLICIT_SIGN; | |
4541 | ||
4542 | /* | |
4543 | * When checking a CERT_PKEY structure all flags are irrelevant if the | |
4544 | * chain is invalid. | |
4545 | */ | |
4546 | if (!check_flags) { | |
4547 | if (rv & CERT_PKEY_VALID) | |
4548 | cpk->valid_flags = rv; | |
4549 | else { | |
4550 | /* Preserve explicit sign flag, clear rest */ | |
4551 | cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN; | |
4552 | return 0; | |
4553 | } | |
4554 | } | |
4555 | return rv; | |
4556 | } | |
484f8762 DSH |
4557 | |
4558 | /* Set validity of certificates in an SSL structure */ | |
4559 | void tls1_set_cert_validity(SSL *s) | |
ae5c8664 MC |
4560 | { |
4561 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC); | |
4562 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN); | |
4563 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN); | |
4564 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA); | |
4565 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA); | |
4566 | tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC); | |
4567 | } | |
4568 | ||
623a5e24 DSH |
4569 | /* User level utiity function to check a chain is suitable */ |
4570 | int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain) | |
ae5c8664 MC |
4571 | { |
4572 | return tls1_check_chain(s, x, pk, chain, -1); | |
4573 | } | |
484f8762 | 4574 | |
c70a1fee | 4575 | #endif |