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31384753 | 1 | /* ssl/statem/statem_srvr.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 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). | |
0f113f3e | 15 | * |
d02b48c6 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. | |
0f113f3e | 22 | * |
d02b48c6 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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 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. | |
0f113f3e | 52 | * |
d02b48c6 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 | */ | |
8e2f6b79 | 58 | /* ==================================================================== |
52b8dad8 | 59 | * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
8e2f6b79 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 | |
0f113f3e | 66 | * notice, this list of conditions and the following disclaimer. |
8e2f6b79 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 | */ | |
ea262260 BM |
111 | /* ==================================================================== |
112 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
113 | * | |
0f113f3e | 114 | * Portions of the attached software ("Contribution") are developed by |
ea262260 BM |
115 | * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
116 | * | |
117 | * The Contribution is licensed pursuant to the OpenSSL open source | |
118 | * license provided above. | |
119 | * | |
ea262260 BM |
120 | * ECC cipher suite support in OpenSSL originally written by |
121 | * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. | |
122 | * | |
123 | */ | |
ddac1974 NL |
124 | /* ==================================================================== |
125 | * Copyright 2005 Nokia. All rights reserved. | |
126 | * | |
127 | * The portions of the attached software ("Contribution") is developed by | |
128 | * Nokia Corporation and is licensed pursuant to the OpenSSL open source | |
129 | * license. | |
130 | * | |
131 | * The Contribution, originally written by Mika Kousa and Pasi Eronen of | |
132 | * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites | |
133 | * support (see RFC 4279) to OpenSSL. | |
134 | * | |
135 | * No patent licenses or other rights except those expressly stated in | |
136 | * the OpenSSL open source license shall be deemed granted or received | |
137 | * expressly, by implication, estoppel, or otherwise. | |
138 | * | |
139 | * No assurances are provided by Nokia that the Contribution does not | |
140 | * infringe the patent or other intellectual property rights of any third | |
141 | * party or that the license provides you with all the necessary rights | |
142 | * to make use of the Contribution. | |
143 | * | |
144 | * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN | |
145 | * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA | |
146 | * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY | |
147 | * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR | |
148 | * OTHERWISE. | |
149 | */ | |
d02b48c6 | 150 | |
de469ef2 | 151 | |
d02b48c6 | 152 | #include <stdio.h> |
8ba708e5 | 153 | #include "../ssl_locl.h" |
61ae935a | 154 | #include "statem_locl.h" |
68570797 | 155 | #include "internal/constant_time_locl.h" |
ec577822 BM |
156 | #include <openssl/buffer.h> |
157 | #include <openssl/rand.h> | |
158 | #include <openssl/objects.h> | |
159 | #include <openssl/evp.h> | |
6434abbf | 160 | #include <openssl/hmac.h> |
ec577822 | 161 | #include <openssl/x509.h> |
3eeaab4b | 162 | #ifndef OPENSSL_NO_DH |
0f113f3e | 163 | # include <openssl/dh.h> |
3eeaab4b | 164 | #endif |
d095b68d | 165 | #include <openssl/bn.h> |
dbad1690 | 166 | #include <openssl/md5.h> |
f9b3bff6 | 167 | |
38a3cbfb EK |
168 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
169 | PACKET *cipher_suites, | |
170 | STACK_OF(SSL_CIPHER) **skp, | |
171 | int sslv2format, int *al); | |
d45ba43d | 172 | |
61ae935a MC |
173 | /* |
174 | * server_read_transition() encapsulates the logic for the allowed handshake | |
175 | * state transitions when the server is reading messages from the client. The | |
176 | * message type that the client has sent is provided in |mt|. The current state | |
177 | * is in |s->statem.hand_state|. | |
178 | * | |
179 | * Valid return values are: | |
180 | * 1: Success (transition allowed) | |
181 | * 0: Error (transition not allowed) | |
182 | */ | |
8481f583 | 183 | int ossl_statem_server_read_transition(SSL *s, int mt) |
61ae935a | 184 | { |
d6f1a6e9 | 185 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
186 | |
187 | switch(st->hand_state) { | |
188 | case TLS_ST_BEFORE: | |
189 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
190 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
191 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
192 | return 1; | |
193 | } | |
194 | break; | |
195 | ||
196 | case TLS_ST_SW_SRVR_DONE: | |
197 | /* | |
198 | * If we get a CKE message after a ServerDone then either | |
199 | * 1) We didn't request a Certificate | |
200 | * OR | |
201 | * 2) If we did request one then | |
202 | * a) We allow no Certificate to be returned | |
203 | * AND | |
204 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
205 | * list if we requested a certificate) | |
206 | */ | |
207 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE | |
208 | && (!s->s3->tmp.cert_request | |
209 | || (!((s->verify_mode & SSL_VERIFY_PEER) && | |
210 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
211 | && (s->version == SSL3_VERSION)))) { | |
212 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
213 | return 1; | |
214 | } else if (s->s3->tmp.cert_request) { | |
215 | if (mt == SSL3_MT_CERTIFICATE) { | |
216 | st->hand_state = TLS_ST_SR_CERT; | |
217 | return 1; | |
218 | } | |
219 | } | |
220 | break; | |
221 | ||
222 | case TLS_ST_SR_CERT: | |
223 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
224 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
225 | return 1; | |
226 | } | |
227 | break; | |
228 | ||
229 | case TLS_ST_SR_KEY_EXCH: | |
230 | /* | |
231 | * We should only process a CertificateVerify message if we have | |
232 | * received a Certificate from the client. If so then |s->session->peer| | |
233 | * will be non NULL. In some instances a CertificateVerify message is | |
234 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 235 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
236 | * set. |
237 | */ | |
a71a4966 | 238 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
239 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
240 | /* | |
241 | * For the ECDH ciphersuites when the client sends its ECDH | |
242 | * pub key in a certificate, the CertificateVerify message is | |
243 | * not sent. Also for GOST ciphersuites when the client uses | |
244 | * its key from the certificate for key exchange. | |
245 | */ | |
246 | st->hand_state = TLS_ST_SR_CHANGE; | |
247 | return 1; | |
248 | } | |
249 | } else { | |
250 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
251 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
252 | return 1; | |
253 | } | |
254 | } | |
255 | break; | |
256 | ||
257 | case TLS_ST_SR_CERT_VRFY: | |
258 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
259 | st->hand_state = TLS_ST_SR_CHANGE; | |
260 | return 1; | |
261 | } | |
262 | break; | |
263 | ||
264 | case TLS_ST_SR_CHANGE: | |
265 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
266 | if (s->s3->next_proto_neg_seen) { | |
267 | if (mt == SSL3_MT_NEXT_PROTO) { | |
268 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
269 | return 1; | |
270 | } | |
271 | } else { | |
272 | #endif | |
273 | if (mt == SSL3_MT_FINISHED) { | |
274 | st->hand_state = TLS_ST_SR_FINISHED; | |
275 | return 1; | |
276 | } | |
277 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
278 | } | |
279 | #endif | |
280 | break; | |
281 | ||
282 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
283 | case TLS_ST_SR_NEXT_PROTO: | |
284 | if (mt == SSL3_MT_FINISHED) { | |
285 | st->hand_state = TLS_ST_SR_FINISHED; | |
286 | return 1; | |
287 | } | |
288 | break; | |
289 | #endif | |
290 | ||
291 | case TLS_ST_SW_FINISHED: | |
292 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
293 | st->hand_state = TLS_ST_SR_CHANGE; | |
294 | return 1; | |
295 | } | |
296 | break; | |
297 | ||
298 | default: | |
299 | break; | |
300 | } | |
301 | ||
302 | /* No valid transition found */ | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Should we send a ServerKeyExchange message? | |
308 | * | |
309 | * Valid return values are: | |
310 | * 1: Yes | |
311 | * 0: No | |
312 | */ | |
bb3e20cf | 313 | static int send_server_key_exchange(SSL *s) |
61ae935a MC |
314 | { |
315 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
316 | ||
317 | /* | |
361a1191 | 318 | * only send a ServerKeyExchange if DH or fortezza but we have a |
61ae935a MC |
319 | * sign only certificate PSK: may send PSK identity hints For |
320 | * ECC ciphersuites, we send a serverKeyExchange message only if | |
321 | * the cipher suite is either ECDH-anon or ECDHE. In other cases, | |
322 | * the server certificate contains the server's public key for | |
323 | * key exchange. | |
324 | */ | |
bc71f910 | 325 | if (alg_k & (SSL_kDHE|SSL_kECDHE) |
61ae935a MC |
326 | /* |
327 | * PSK: send ServerKeyExchange if PSK identity hint if | |
328 | * provided | |
329 | */ | |
330 | #ifndef OPENSSL_NO_PSK | |
331 | /* Only send SKE if we have identity hint for plain PSK */ | |
332 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
333 | && s->cert->psk_identity_hint) | |
334 | /* For other PSK always send SKE */ | |
335 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
336 | #endif | |
337 | #ifndef OPENSSL_NO_SRP | |
338 | /* SRP: send ServerKeyExchange */ | |
339 | || (alg_k & SSL_kSRP) | |
340 | #endif | |
341 | ) { | |
342 | return 1; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Should we send a CertificateRequest message? | |
350 | * | |
351 | * Valid return values are: | |
352 | * 1: Yes | |
353 | * 0: No | |
354 | */ | |
bb3e20cf | 355 | static int send_certificate_request(SSL *s) |
61ae935a MC |
356 | { |
357 | if ( | |
358 | /* don't request cert unless asked for it: */ | |
359 | s->verify_mode & SSL_VERIFY_PEER | |
360 | /* | |
361 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
362 | * during re-negotiation: | |
363 | */ | |
364 | && ((s->session->peer == NULL) || | |
365 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) | |
366 | /* | |
367 | * never request cert in anonymous ciphersuites (see | |
368 | * section "Certificate request" in SSL 3 drafts and in | |
369 | * RFC 2246): | |
370 | */ | |
371 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
372 | /* | |
373 | * ... except when the application insists on | |
374 | * verification (against the specs, but s3_clnt.c accepts | |
375 | * this for SSL 3) | |
376 | */ | |
377 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
378 | /* don't request certificate for SRP auth */ | |
379 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
380 | /* | |
381 | * With normal PSK Certificates and Certificate Requests | |
382 | * are omitted | |
383 | */ | |
b7fa1f98 | 384 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { |
61ae935a MC |
385 | return 1; |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | /* | |
392 | * server_write_transition() works out what handshake state to move to next | |
393 | * when the server is writing messages to be sent to the client. | |
394 | */ | |
8481f583 | 395 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s) |
61ae935a | 396 | { |
d6f1a6e9 | 397 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
398 | |
399 | switch(st->hand_state) { | |
400 | case TLS_ST_BEFORE: | |
401 | /* Just go straight to trying to read from the client */; | |
402 | return WRITE_TRAN_FINISHED; | |
403 | ||
404 | case TLS_ST_OK: | |
405 | /* We must be trying to renegotiate */ | |
406 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
407 | return WRITE_TRAN_CONTINUE; | |
408 | ||
409 | case TLS_ST_SW_HELLO_REQ: | |
410 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 411 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
412 | return WRITE_TRAN_CONTINUE; |
413 | ||
414 | case TLS_ST_SR_CLNT_HELLO: | |
415 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
416 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) | |
417 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; | |
418 | else | |
419 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
420 | return WRITE_TRAN_CONTINUE; | |
421 | ||
422 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
423 | return WRITE_TRAN_FINISHED; | |
424 | ||
425 | case TLS_ST_SW_SRVR_HELLO: | |
426 | if (s->hit) { | |
427 | if (s->tlsext_ticket_expected) | |
428 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
429 | else | |
430 | st->hand_state = TLS_ST_SW_CHANGE; | |
431 | } else { | |
432 | /* Check if it is anon DH or anon ECDH, */ | |
433 | /* normal PSK or SRP */ | |
434 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
435 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { | |
436 | st->hand_state = TLS_ST_SW_CERT; | |
437 | } else if (send_server_key_exchange(s)) { | |
438 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
439 | } else if (send_certificate_request(s)) { | |
440 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
441 | } else { | |
442 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
443 | } | |
444 | } | |
445 | return WRITE_TRAN_CONTINUE; | |
446 | ||
447 | case TLS_ST_SW_CERT: | |
448 | if (s->tlsext_status_expected) { | |
449 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
450 | return WRITE_TRAN_CONTINUE; | |
451 | } | |
452 | /* Fall through */ | |
453 | ||
454 | case TLS_ST_SW_CERT_STATUS: | |
455 | if (send_server_key_exchange(s)) { | |
456 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
457 | return WRITE_TRAN_CONTINUE; | |
458 | } | |
459 | /* Fall through */ | |
460 | ||
461 | case TLS_ST_SW_KEY_EXCH: | |
462 | if (send_certificate_request(s)) { | |
463 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
464 | return WRITE_TRAN_CONTINUE; | |
465 | } | |
466 | /* Fall through */ | |
467 | ||
468 | case TLS_ST_SW_CERT_REQ: | |
469 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
470 | return WRITE_TRAN_CONTINUE; | |
471 | ||
472 | case TLS_ST_SW_SRVR_DONE: | |
473 | return WRITE_TRAN_FINISHED; | |
474 | ||
475 | case TLS_ST_SR_FINISHED: | |
476 | if (s->hit) { | |
477 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 478 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
479 | return WRITE_TRAN_CONTINUE; |
480 | } else if (s->tlsext_ticket_expected) { | |
481 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
482 | } else { | |
483 | st->hand_state = TLS_ST_SW_CHANGE; | |
484 | } | |
485 | return WRITE_TRAN_CONTINUE; | |
486 | ||
487 | case TLS_ST_SW_SESSION_TICKET: | |
488 | st->hand_state = TLS_ST_SW_CHANGE; | |
489 | return WRITE_TRAN_CONTINUE; | |
490 | ||
491 | case TLS_ST_SW_CHANGE: | |
492 | st->hand_state = TLS_ST_SW_FINISHED; | |
493 | return WRITE_TRAN_CONTINUE; | |
494 | ||
495 | case TLS_ST_SW_FINISHED: | |
496 | if (s->hit) { | |
497 | return WRITE_TRAN_FINISHED; | |
498 | } | |
499 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 500 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
501 | return WRITE_TRAN_CONTINUE; |
502 | ||
503 | default: | |
504 | /* Shouldn't happen */ | |
505 | return WRITE_TRAN_ERROR; | |
506 | } | |
507 | } | |
508 | ||
509 | /* | |
510 | * Perform any pre work that needs to be done prior to sending a message from | |
511 | * the server to the client. | |
512 | */ | |
8481f583 | 513 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) |
61ae935a | 514 | { |
d6f1a6e9 | 515 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
516 | |
517 | switch(st->hand_state) { | |
518 | case TLS_ST_SW_HELLO_REQ: | |
519 | s->shutdown = 0; | |
520 | if (SSL_IS_DTLS(s)) | |
521 | dtls1_clear_record_buffer(s); | |
522 | break; | |
523 | ||
524 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
525 | s->shutdown = 0; | |
526 | if (SSL_IS_DTLS(s)) { | |
527 | dtls1_clear_record_buffer(s); | |
528 | /* We don't buffer this message so don't use the timer */ | |
529 | st->use_timer = 0; | |
530 | } | |
531 | break; | |
532 | ||
533 | case TLS_ST_SW_SRVR_HELLO: | |
534 | if (SSL_IS_DTLS(s)) { | |
535 | /* | |
536 | * Messages we write from now on should be bufferred and | |
537 | * retransmitted if necessary, so we need to use the timer now | |
538 | */ | |
539 | st->use_timer = 1; | |
540 | } | |
541 | break; | |
542 | ||
543 | case TLS_ST_SW_SRVR_DONE: | |
544 | #ifndef OPENSSL_NO_SCTP | |
545 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
546 | return dtls_wait_for_dry(s); | |
547 | #endif | |
548 | return WORK_FINISHED_CONTINUE; | |
549 | ||
550 | case TLS_ST_SW_SESSION_TICKET: | |
551 | if (SSL_IS_DTLS(s)) { | |
552 | /* | |
553 | * We're into the last flight. We don't retransmit the last flight | |
554 | * unless we need to, so we don't use the timer | |
555 | */ | |
556 | st->use_timer = 0; | |
557 | } | |
558 | break; | |
559 | ||
560 | case TLS_ST_SW_CHANGE: | |
561 | s->session->cipher = s->s3->tmp.new_cipher; | |
562 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 563 | ossl_statem_set_error(s); |
61ae935a MC |
564 | return WORK_ERROR; |
565 | } | |
566 | if (SSL_IS_DTLS(s)) { | |
567 | /* | |
568 | * We're into the last flight. We don't retransmit the last flight | |
569 | * unless we need to, so we don't use the timer. This might have | |
570 | * already been set to 0 if we sent a NewSessionTicket message, | |
571 | * but we'll set it again here in case we didn't. | |
572 | */ | |
573 | st->use_timer = 0; | |
574 | } | |
575 | return WORK_FINISHED_CONTINUE; | |
576 | ||
577 | case TLS_ST_OK: | |
578 | return tls_finish_handshake(s, wst); | |
579 | ||
580 | default: | |
581 | /* No pre work to be done */ | |
582 | break; | |
583 | } | |
584 | ||
585 | return WORK_FINISHED_CONTINUE; | |
586 | } | |
587 | ||
588 | /* | |
589 | * Perform any work that needs to be done after sending a message from the | |
590 | * server to the client. | |
591 | */ | |
8481f583 | 592 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) |
61ae935a | 593 | { |
d6f1a6e9 | 594 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
595 | |
596 | s->init_num = 0; | |
597 | ||
598 | switch(st->hand_state) { | |
599 | case TLS_ST_SW_HELLO_REQ: | |
600 | if (statem_flush(s) != 1) | |
601 | return WORK_MORE_A; | |
602 | ssl3_init_finished_mac(s); | |
603 | break; | |
604 | ||
605 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
606 | if (statem_flush(s) != 1) | |
607 | return WORK_MORE_A; | |
608 | /* HelloVerifyRequest resets Finished MAC */ | |
609 | if (s->version != DTLS1_BAD_VER) | |
610 | ssl3_init_finished_mac(s); | |
611 | /* | |
612 | * The next message should be another ClientHello which we need to | |
613 | * treat like it was the first packet | |
614 | */ | |
615 | s->first_packet = 1; | |
616 | break; | |
617 | ||
618 | case TLS_ST_SW_SRVR_HELLO: | |
619 | #ifndef OPENSSL_NO_SCTP | |
620 | if (SSL_IS_DTLS(s) && s->hit) { | |
621 | unsigned char sctpauthkey[64]; | |
622 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
623 | ||
624 | /* | |
625 | * Add new shared key for SCTP-Auth, will be ignored if no | |
626 | * SCTP used. | |
627 | */ | |
141eb8c6 MC |
628 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
629 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
630 | |
631 | if (SSL_export_keying_material(s, sctpauthkey, | |
632 | sizeof(sctpauthkey), labelbuffer, | |
633 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 634 | ossl_statem_set_error(s); |
61ae935a MC |
635 | return WORK_ERROR; |
636 | } | |
637 | ||
638 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
639 | sizeof(sctpauthkey), sctpauthkey); | |
640 | } | |
641 | #endif | |
642 | break; | |
643 | ||
644 | case TLS_ST_SW_CHANGE: | |
645 | #ifndef OPENSSL_NO_SCTP | |
646 | if (SSL_IS_DTLS(s) && !s->hit) { | |
647 | /* | |
648 | * Change to new shared key of SCTP-Auth, will be ignored if | |
649 | * no SCTP used. | |
650 | */ | |
651 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
652 | 0, NULL); | |
653 | } | |
654 | #endif | |
655 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
656 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { | |
fe3a3291 | 657 | ossl_statem_set_error(s); |
61ae935a MC |
658 | return WORK_ERROR; |
659 | } | |
660 | ||
661 | if (SSL_IS_DTLS(s)) | |
662 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
663 | break; | |
664 | ||
665 | case TLS_ST_SW_SRVR_DONE: | |
666 | if (statem_flush(s) != 1) | |
667 | return WORK_MORE_A; | |
668 | break; | |
669 | ||
670 | case TLS_ST_SW_FINISHED: | |
671 | if (statem_flush(s) != 1) | |
672 | return WORK_MORE_A; | |
673 | #ifndef OPENSSL_NO_SCTP | |
674 | if (SSL_IS_DTLS(s) && s->hit) { | |
675 | /* | |
676 | * Change to new shared key of SCTP-Auth, will be ignored if | |
677 | * no SCTP used. | |
678 | */ | |
679 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
680 | 0, NULL); | |
681 | } | |
682 | #endif | |
683 | break; | |
684 | ||
685 | default: | |
686 | /* No post work to be done */ | |
687 | break; | |
688 | } | |
689 | ||
690 | return WORK_FINISHED_CONTINUE; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Construct a message to be sent from the server to the client. | |
695 | * | |
696 | * Valid return values are: | |
697 | * 1: Success | |
698 | * 0: Error | |
699 | */ | |
8481f583 | 700 | int ossl_statem_server_construct_message(SSL *s) |
61ae935a | 701 | { |
d6f1a6e9 | 702 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
703 | |
704 | switch(st->hand_state) { | |
705 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
706 | return dtls_construct_hello_verify_request(s); | |
707 | ||
708 | case TLS_ST_SW_HELLO_REQ: | |
709 | return tls_construct_hello_request(s); | |
710 | ||
711 | case TLS_ST_SW_SRVR_HELLO: | |
712 | return tls_construct_server_hello(s); | |
713 | ||
714 | case TLS_ST_SW_CERT: | |
715 | return tls_construct_server_certificate(s); | |
716 | ||
717 | case TLS_ST_SW_KEY_EXCH: | |
718 | return tls_construct_server_key_exchange(s); | |
719 | ||
720 | case TLS_ST_SW_CERT_REQ: | |
721 | return tls_construct_certificate_request(s); | |
722 | ||
723 | case TLS_ST_SW_SRVR_DONE: | |
724 | return tls_construct_server_done(s); | |
725 | ||
726 | case TLS_ST_SW_SESSION_TICKET: | |
727 | return tls_construct_new_session_ticket(s); | |
728 | ||
729 | case TLS_ST_SW_CERT_STATUS: | |
730 | return tls_construct_cert_status(s); | |
731 | ||
732 | case TLS_ST_SW_CHANGE: | |
733 | if (SSL_IS_DTLS(s)) | |
734 | return dtls_construct_change_cipher_spec(s); | |
735 | else | |
736 | return tls_construct_change_cipher_spec(s); | |
737 | ||
738 | case TLS_ST_SW_FINISHED: | |
739 | return tls_construct_finished(s, | |
740 | s->method-> | |
741 | ssl3_enc->server_finished_label, | |
742 | s->method-> | |
743 | ssl3_enc->server_finished_label_len); | |
744 | ||
745 | default: | |
746 | /* Shouldn't happen */ | |
747 | break; | |
748 | } | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 | |
754 | #define NEXT_PROTO_MAX_LENGTH 514 | |
755 | ||
756 | /* | |
757 | * Returns the maximum allowed length for the current message that we are | |
758 | * reading. Excludes the message header. | |
759 | */ | |
8481f583 | 760 | unsigned long ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 761 | { |
d6f1a6e9 | 762 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
763 | |
764 | switch(st->hand_state) { | |
765 | case TLS_ST_SR_CLNT_HELLO: | |
766 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
767 | ||
768 | case TLS_ST_SR_CERT: | |
769 | return s->max_cert_list; | |
770 | ||
771 | case TLS_ST_SR_KEY_EXCH: | |
772 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
773 | ||
774 | case TLS_ST_SR_CERT_VRFY: | |
775 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
776 | ||
777 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
778 | case TLS_ST_SR_NEXT_PROTO: | |
779 | return NEXT_PROTO_MAX_LENGTH; | |
780 | #endif | |
781 | ||
782 | case TLS_ST_SR_CHANGE: | |
783 | return CCS_MAX_LENGTH; | |
784 | ||
785 | case TLS_ST_SR_FINISHED: | |
786 | return FINISHED_MAX_LENGTH; | |
787 | ||
788 | default: | |
789 | /* Shouldn't happen */ | |
790 | break; | |
791 | } | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Process a message that the server has received from the client. | |
798 | */ | |
8481f583 | 799 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 800 | { |
d6f1a6e9 | 801 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
802 | |
803 | switch(st->hand_state) { | |
804 | case TLS_ST_SR_CLNT_HELLO: | |
805 | return tls_process_client_hello(s, pkt); | |
806 | ||
807 | case TLS_ST_SR_CERT: | |
808 | return tls_process_client_certificate(s, pkt); | |
809 | ||
810 | case TLS_ST_SR_KEY_EXCH: | |
811 | return tls_process_client_key_exchange(s, pkt); | |
812 | ||
813 | case TLS_ST_SR_CERT_VRFY: | |
814 | return tls_process_cert_verify(s, pkt); | |
815 | ||
816 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
817 | case TLS_ST_SR_NEXT_PROTO: | |
818 | return tls_process_next_proto(s, pkt); | |
819 | #endif | |
820 | ||
821 | case TLS_ST_SR_CHANGE: | |
822 | return tls_process_change_cipher_spec(s, pkt); | |
823 | ||
824 | case TLS_ST_SR_FINISHED: | |
825 | return tls_process_finished(s, pkt); | |
826 | ||
827 | default: | |
828 | /* Shouldn't happen */ | |
829 | break; | |
830 | } | |
831 | ||
832 | return MSG_PROCESS_ERROR; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Perform any further processing required following the receipt of a message | |
837 | * from the client | |
838 | */ | |
8481f583 | 839 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 840 | { |
d6f1a6e9 | 841 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
842 | |
843 | switch(st->hand_state) { | |
844 | case TLS_ST_SR_CLNT_HELLO: | |
845 | return tls_post_process_client_hello(s, wst); | |
846 | ||
847 | case TLS_ST_SR_KEY_EXCH: | |
848 | return tls_post_process_client_key_exchange(s, wst); | |
849 | ||
850 | case TLS_ST_SR_CERT_VRFY: | |
851 | #ifndef OPENSSL_NO_SCTP | |
852 | if ( /* Is this SCTP? */ | |
853 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
854 | /* Are we renegotiating? */ | |
855 | && s->renegotiate | |
856 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
857 | s->s3->in_read_app_data = 2; | |
858 | s->rwstate = SSL_READING; | |
859 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
860 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 861 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
862 | return WORK_MORE_A; |
863 | } else { | |
d99b0691 | 864 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
865 | } |
866 | #endif | |
867 | return WORK_FINISHED_CONTINUE; | |
868 | ||
61ae935a MC |
869 | default: |
870 | break; | |
871 | } | |
872 | ||
873 | /* Shouldn't happen */ | |
874 | return WORK_ERROR; | |
875 | } | |
876 | ||
edc032b5 | 877 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 878 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
879 | { |
880 | int ret = SSL_ERROR_NONE; | |
881 | ||
882 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
883 | ||
884 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
885 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
886 | if (s->srp_ctx.login == NULL) { | |
887 | /* | |
888 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
889 | * login name | |
890 | */ | |
891 | ret = SSL3_AL_FATAL; | |
892 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
893 | } else { | |
894 | ret = SSL_srp_server_param_with_username(s, al); | |
895 | } | |
896 | } | |
897 | return ret; | |
898 | } | |
edc032b5 BL |
899 | #endif |
900 | ||
e27f234a MC |
901 | int tls_construct_hello_request(SSL *s) |
902 | { | |
903 | if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) { | |
904 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 905 | ossl_statem_set_error(s); |
e27f234a MC |
906 | return 0; |
907 | } | |
908 | ||
909 | return 1; | |
910 | } | |
911 | ||
8ba708e5 MC |
912 | unsigned int dtls_raw_hello_verify_request(unsigned char *buf, |
913 | unsigned char *cookie, | |
914 | unsigned char cookie_len) | |
915 | { | |
916 | unsigned int msg_len; | |
917 | unsigned char *p; | |
918 | ||
919 | p = buf; | |
920 | /* Always use DTLS 1.0 version: see RFC 6347 */ | |
921 | *(p++) = DTLS1_VERSION >> 8; | |
922 | *(p++) = DTLS1_VERSION & 0xFF; | |
923 | ||
924 | *(p++) = (unsigned char)cookie_len; | |
925 | memcpy(p, cookie, cookie_len); | |
926 | p += cookie_len; | |
927 | msg_len = p - buf; | |
928 | ||
929 | return msg_len; | |
930 | } | |
931 | ||
932 | int dtls_construct_hello_verify_request(SSL *s) | |
933 | { | |
934 | unsigned int len; | |
935 | unsigned char *buf; | |
936 | ||
937 | buf = (unsigned char *)s->init_buf->data; | |
938 | ||
939 | if (s->ctx->app_gen_cookie_cb == NULL || | |
940 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
941 | &(s->d1->cookie_len)) == 0 || | |
942 | s->d1->cookie_len > 255) { | |
f0659bdb | 943 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 944 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
fe3a3291 | 945 | ossl_statem_set_error(s); |
8ba708e5 MC |
946 | return 0; |
947 | } | |
948 | ||
949 | len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH], | |
950 | s->d1->cookie, s->d1->cookie_len); | |
951 | ||
952 | dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, | |
953 | len); | |
954 | len += DTLS1_HM_HEADER_LENGTH; | |
955 | ||
956 | /* number of bytes to write */ | |
957 | s->init_num = len; | |
958 | s->init_off = 0; | |
959 | ||
960 | return 1; | |
961 | } | |
962 | ||
be3583fa | 963 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
964 | { |
965 | int i, al = SSL_AD_INTERNAL_ERROR; | |
966 | unsigned int j, complen = 0; | |
967 | unsigned long id; | |
968 | SSL_CIPHER *c; | |
969 | #ifndef OPENSSL_NO_COMP | |
970 | SSL_COMP *comp = NULL; | |
971 | #endif | |
972 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
973 | int protverr = 1; | |
974 | /* |cookie| will only be initialized for DTLS. */ | |
73999b62 | 975 | PACKET session_id, cipher_suites, compression, extensions, cookie; |
e27f234a MC |
976 | int is_v2_record; |
977 | ||
b3e2272c EK |
978 | is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
979 | ||
bbafa47b | 980 | PACKET_null_init(&cookie); |
32ec4153 | 981 | /* First lets get s->client_version set correctly */ |
b3e2272c | 982 | if (is_v2_record) { |
9ceb2426 MC |
983 | unsigned int version; |
984 | unsigned int mt; | |
32ec4153 MC |
985 | /*- |
986 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
987 | * header is sent directly on the wire, not wrapped as a TLS | |
988 | * record. Our record layer just processes the message length and passes | |
989 | * the rest right through. Its format is: | |
990 | * Byte Content | |
991 | * 0-1 msg_length - decoded by the record layer | |
992 | * 2 msg_type - s->init_msg points here | |
993 | * 3-4 version | |
994 | * 5-6 cipher_spec_length | |
995 | * 7-8 session_id_length | |
996 | * 9-10 challenge_length | |
997 | * ... ... | |
998 | */ | |
999 | ||
73999b62 | 1000 | if (!PACKET_get_1(pkt, &mt) |
9ceb2426 | 1001 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
1002 | /* |
1003 | * Should never happen. We should have tested this in the record | |
1004 | * layer in order to have determined that this is a SSLv2 record | |
1005 | * in the first place | |
1006 | */ | |
e27f234a | 1007 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 1008 | goto err; |
32ec4153 MC |
1009 | } |
1010 | ||
73999b62 | 1011 | if (!PACKET_get_net_2(pkt, &version)) { |
9ceb2426 | 1012 | /* No protocol version supplied! */ |
e27f234a | 1013 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
9ceb2426 MC |
1014 | goto err; |
1015 | } | |
1016 | if (version == 0x0002) { | |
32ec4153 | 1017 | /* This is real SSLv2. We don't support it. */ |
e27f234a | 1018 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1019 | goto err; |
9ceb2426 | 1020 | } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) { |
32ec4153 | 1021 | /* SSLv3/TLS */ |
9ceb2426 | 1022 | s->client_version = version; |
32ec4153 MC |
1023 | } else { |
1024 | /* No idea what protocol this is */ | |
e27f234a | 1025 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 MC |
1026 | goto err; |
1027 | } | |
1028 | } else { | |
1029 | /* | |
9ceb2426 MC |
1030 | * use version from inside client hello, not from record header (may |
1031 | * differ: see RFC 2246, Appendix E, second paragraph) | |
32ec4153 | 1032 | */ |
73999b62 | 1033 | if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) { |
32ec4153 | 1034 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 1035 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); |
32ec4153 MC |
1036 | goto f_err; |
1037 | } | |
5e9f0eeb MC |
1038 | } |
1039 | ||
32ec4153 MC |
1040 | /* Do SSL/TLS version negotiation if applicable */ |
1041 | if (!SSL_IS_DTLS(s)) { | |
1042 | if (s->version != TLS_ANY_VERSION) { | |
b2ce0337 | 1043 | if (s->client_version >= s->version) { |
32ec4153 MC |
1044 | protverr = 0; |
1045 | } | |
b2ce0337 | 1046 | } else if (s->client_version >= SSL3_VERSION) { |
32ec4153 MC |
1047 | switch(s->client_version) { |
1048 | default: | |
1049 | case TLS1_2_VERSION: | |
1050 | if(!(s->options & SSL_OP_NO_TLSv1_2)) { | |
1051 | s->version = TLS1_2_VERSION; | |
1052 | s->method = TLSv1_2_server_method(); | |
1053 | protverr = 0; | |
1054 | break; | |
1055 | } | |
1056 | /* Deliberately fall through */ | |
1057 | case TLS1_1_VERSION: | |
1058 | if(!(s->options & SSL_OP_NO_TLSv1_1)) { | |
1059 | s->version = TLS1_1_VERSION; | |
1060 | s->method = TLSv1_1_server_method(); | |
1061 | protverr = 0; | |
1062 | break; | |
1063 | } | |
1064 | /* Deliberately fall through */ | |
1065 | case TLS1_VERSION: | |
1066 | if(!(s->options & SSL_OP_NO_TLSv1)) { | |
1067 | s->version = TLS1_VERSION; | |
1068 | s->method = TLSv1_server_method(); | |
1069 | protverr = 0; | |
1070 | break; | |
1071 | } | |
1072 | /* Deliberately fall through */ | |
1073 | case SSL3_VERSION: | |
b2ce0337 | 1074 | #ifndef OPENSSL_NO_SSL3 |
32ec4153 MC |
1075 | if(!(s->options & SSL_OP_NO_SSLv3)) { |
1076 | s->version = SSL3_VERSION; | |
1077 | s->method = SSLv3_server_method(); | |
1078 | protverr = 0; | |
1079 | break; | |
1080 | } | |
b2ce0337 MC |
1081 | #else |
1082 | break; | |
1083 | #endif | |
32ec4153 MC |
1084 | } |
1085 | } | |
b2ce0337 MC |
1086 | } else if (s->client_version <= s->version |
1087 | || s->method->version == DTLS_ANY_VERSION) { | |
32ec4153 MC |
1088 | /* |
1089 | * For DTLS we just check versions are potentially compatible. Version | |
1090 | * negotiation comes later. | |
1091 | */ | |
1092 | protverr = 0; | |
1093 | } | |
1094 | ||
1095 | if (protverr) { | |
e27f234a | 1096 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1097 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
1098 | /* |
1099 | * similar to ssl3_get_record, send alert using remote version | |
1100 | * number | |
1101 | */ | |
1102 | s->version = s->client_version; | |
1103 | } | |
1104 | al = SSL_AD_PROTOCOL_VERSION; | |
1105 | goto f_err; | |
1106 | } | |
1107 | ||
b3e2272c EK |
1108 | /* Parse the message and load client random. */ |
1109 | if (is_v2_record) { | |
32ec4153 MC |
1110 | /* |
1111 | * Handle an SSLv2 backwards compatible ClientHello | |
1112 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1113 | * Real SSLv2 is not supported, and is rejected above. | |
1114 | */ | |
ec30e856 | 1115 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1116 | PACKET challenge; |
0f113f3e | 1117 | |
73999b62 MC |
1118 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1119 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1120 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1121 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1122 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1123 | al = SSL_AD_DECODE_ERROR; |
1124 | goto f_err; | |
5e9f0eeb | 1125 | } |
0f113f3e | 1126 | |
73999b62 MC |
1127 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1128 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1129 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1130 | /* No extensions. */ |
73999b62 | 1131 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1132 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1133 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1134 | al = SSL_AD_DECODE_ERROR; |
1135 | goto f_err; | |
1136 | } | |
1137 | ||
32ec4153 | 1138 | /* Load the client random */ |
b3e2272c EK |
1139 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1140 | challenge_len; | |
32ec4153 | 1141 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1142 | if (!PACKET_copy_bytes(&challenge, |
1143 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
1144 | challenge_len, challenge_len)) { | |
f0659bdb | 1145 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1146 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1147 | goto f_err; |
1148 | } | |
b3e2272c EK |
1149 | |
1150 | PACKET_null_init(&compression); | |
1151 | PACKET_null_init(&extensions); | |
0f113f3e | 1152 | } else { |
b3e2272c | 1153 | /* Regular ClientHello. */ |
73999b62 MC |
1154 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1155 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1156 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1157 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1158 | goto f_err; |
1159 | } | |
32ec4153 | 1160 | |
b3e2272c | 1161 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1162 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1163 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1164 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1165 | goto f_err; |
1166 | } | |
b3e2272c EK |
1167 | /* |
1168 | * If we require cookies and this ClientHello doesn't contain one, | |
1169 | * just return since we do not want to allocate any memory yet. | |
1170 | * So check cookie length... | |
1171 | */ | |
1172 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1173 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1174 | return 1; |
b3e2272c | 1175 | } |
5e9f0eeb | 1176 | } |
0f113f3e | 1177 | |
73999b62 MC |
1178 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1179 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c | 1180 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1181 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
b3e2272c EK |
1182 | goto f_err; |
1183 | } | |
1184 | /* Could be empty. */ | |
73999b62 | 1185 | extensions = *pkt; |
b3e2272c EK |
1186 | } |
1187 | ||
1188 | s->hit = 0; | |
1189 | ||
1190 | /* | |
1191 | * We don't allow resumption in a backwards compatible ClientHello. | |
1192 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1193 | * | |
1194 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1195 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1196 | * ignore resumption requests with flag | |
1197 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1198 | * than a change to default behavior so that applications relying on | |
1199 | * this for security won't even compile against older library versions). | |
1200 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1201 | * request renegotiation but not a new session (s->new_session remains | |
1202 | * unset): for servers, this essentially just means that the | |
1203 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1204 | * ignored. | |
1205 | */ | |
1206 | if (is_v2_record || | |
1207 | (s->new_session && | |
1208 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1209 | if (!ssl_get_new_session(s, 1)) | |
1210 | goto err; | |
1211 | } else { | |
1212 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1213 | /* |
b3e2272c EK |
1214 | * Only resume if the session's version matches the negotiated |
1215 | * version. | |
1216 | * RFC 5246 does not provide much useful advice on resumption | |
1217 | * with a different protocol version. It doesn't forbid it but | |
1218 | * the sanity of such behaviour would be questionable. | |
1219 | * In practice, clients do not accept a version mismatch and | |
1220 | * will abort the handshake with an error. | |
0f113f3e | 1221 | */ |
b3e2272c EK |
1222 | if (i == 1 && s->version == s->session->ssl_version) { |
1223 | /* previous session */ | |
1224 | s->hit = 1; | |
1225 | } else if (i == -1) { | |
1226 | goto err; | |
32ec4153 | 1227 | } else { |
b3e2272c EK |
1228 | /* i == 0 */ |
1229 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1230 | goto err; |
0f113f3e | 1231 | } |
b3e2272c | 1232 | } |
0f113f3e | 1233 | |
b3e2272c | 1234 | if (SSL_IS_DTLS(s)) { |
e27f234a | 1235 | /* Empty cookie was already handled above by returning early. */ |
31011544 | 1236 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { |
b3e2272c | 1237 | if (s->ctx->app_verify_cookie_cb != NULL) { |
31011544 EK |
1238 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), |
1239 | PACKET_remaining(&cookie)) == 0) { | |
32ec4153 | 1240 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1241 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1242 | SSL_R_COOKIE_MISMATCH); |
32ec4153 | 1243 | goto f_err; |
31011544 | 1244 | /* else cookie verification succeeded */ |
32ec4153 | 1245 | } |
b3e2272c | 1246 | /* default verification */ |
31011544 EK |
1247 | } else if (!PACKET_equal(&cookie, s->d1->cookie, |
1248 | s->d1->cookie_len)) { | |
b3e2272c | 1249 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1250 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); |
b3e2272c | 1251 | goto f_err; |
32ec4153 | 1252 | } |
e27f234a | 1253 | s->d1->cookie_verified = 1; |
0f113f3e | 1254 | } |
b3e2272c EK |
1255 | if (s->method->version == DTLS_ANY_VERSION) { |
1256 | /* Select version to use */ | |
1257 | if (s->client_version <= DTLS1_2_VERSION && | |
1258 | !(s->options & SSL_OP_NO_DTLSv1_2)) { | |
1259 | s->version = DTLS1_2_VERSION; | |
1260 | s->method = DTLSv1_2_server_method(); | |
1261 | } else if (tls1_suiteb(s)) { | |
f0659bdb | 1262 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c EK |
1263 | SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); |
1264 | s->version = s->client_version; | |
1265 | al = SSL_AD_PROTOCOL_VERSION; | |
1266 | goto f_err; | |
1267 | } else if (s->client_version <= DTLS1_VERSION && | |
1268 | !(s->options & SSL_OP_NO_DTLSv1)) { | |
1269 | s->version = DTLS1_VERSION; | |
1270 | s->method = DTLSv1_server_method(); | |
1271 | } else { | |
f0659bdb | 1272 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c EK |
1273 | SSL_R_WRONG_VERSION_NUMBER); |
1274 | s->version = s->client_version; | |
1275 | al = SSL_AD_PROTOCOL_VERSION; | |
1276 | goto f_err; | |
1277 | } | |
1278 | s->session->ssl_version = s->version; | |
32ec4153 | 1279 | } |
b3e2272c | 1280 | } |
3ae91cfb | 1281 | |
38a3cbfb EK |
1282 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1283 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1284 | goto f_err; |
1285 | } | |
5e9f0eeb | 1286 | |
b3e2272c EK |
1287 | /* If it is a hit, check that the cipher is in the list */ |
1288 | if (s->hit) { | |
1289 | j = 0; | |
1290 | id = s->session->cipher->id; | |
d02b48c6 | 1291 | |
413c4f45 | 1292 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1293 | fprintf(stderr, "client sent %d ciphers\n", |
1294 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1295 | #endif |
b3e2272c EK |
1296 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1297 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1298 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1299 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1300 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1301 | #endif |
b3e2272c EK |
1302 | if (c->id == id) { |
1303 | j = 1; | |
1304 | break; | |
32ec4153 | 1305 | } |
0f113f3e | 1306 | } |
b3e2272c | 1307 | if (j == 0) { |
ec30e856 | 1308 | /* |
b3e2272c EK |
1309 | * we need to have the cipher in the cipher list if we are asked |
1310 | * to reuse it | |
ec30e856 | 1311 | */ |
b3e2272c | 1312 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1313 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1314 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1315 | goto f_err; |
1316 | } | |
b3e2272c | 1317 | } |
9ceb2426 | 1318 | |
b3e2272c EK |
1319 | complen = PACKET_remaining(&compression); |
1320 | for (j = 0; j < complen; j++) { | |
1321 | if (PACKET_data(&compression)[j] == 0) | |
1322 | break; | |
0f113f3e | 1323 | } |
32ec4153 | 1324 | |
b3e2272c EK |
1325 | if (j >= complen) { |
1326 | /* no compress */ | |
1327 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1328 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1329 | goto f_err; |
1330 | } | |
1331 | ||
0f113f3e MC |
1332 | /* TLS extensions */ |
1333 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1334 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
f0659bdb | 1335 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
0f113f3e MC |
1336 | goto err; |
1337 | } | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Check if we want to use external pre-shared secret for this handshake | |
1342 | * for not reused session only. We need to generate server_random before | |
1343 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1344 | * processing to use it in key derivation. | |
1345 | */ | |
1346 | { | |
1347 | unsigned char *pos; | |
1348 | pos = s->s3->server_random; | |
1349 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1350 | goto f_err; | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
1355 | SSL_CIPHER *pref_cipher = NULL; | |
1356 | ||
1357 | s->session->master_key_length = sizeof(s->session->master_key); | |
1358 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1359 | &s->session->master_key_length, ciphers, | |
1360 | &pref_cipher, | |
1361 | s->tls_session_secret_cb_arg)) { | |
1362 | s->hit = 1; | |
1363 | s->session->ciphers = ciphers; | |
1364 | s->session->verify_result = X509_V_OK; | |
1365 | ||
1366 | ciphers = NULL; | |
1367 | ||
1368 | /* check if some cipher was preferred by call back */ | |
1369 | pref_cipher = | |
1370 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1371 | s-> | |
1372 | session->ciphers, | |
1373 | SSL_get_ciphers | |
1374 | (s)); | |
1375 | if (pref_cipher == NULL) { | |
1376 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1377 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1378 | goto f_err; |
1379 | } | |
1380 | ||
1381 | s->session->cipher = pref_cipher; | |
25aaa98a | 1382 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1383 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1384 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1385 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1386 | } | |
1387 | } | |
58ece833 | 1388 | |
0f113f3e MC |
1389 | /* |
1390 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1391 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1392 | * algorithms from the client, starting at q. |
1393 | */ | |
1394 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1395 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1396 | /* This only happens if we have a cache hit */ |
1397 | if (s->session->compress_meth != 0) { | |
1398 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1399 | unsigned int k; |
0f113f3e MC |
1400 | /* Perform sanity checks on resumed compression algorithm */ |
1401 | /* Can't disable compression */ | |
1402 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1403 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1404 | SSL_R_INCONSISTENT_COMPRESSION); |
1405 | goto f_err; | |
1406 | } | |
1407 | /* Look for resumed compression method */ | |
1408 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1409 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1410 | if (comp_id == comp->id) { | |
1411 | s->s3->tmp.new_compression = comp; | |
1412 | break; | |
1413 | } | |
1414 | } | |
1415 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1416 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1417 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1418 | goto f_err; | |
1419 | } | |
1420 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1421 | for (k = 0; k < complen; k++) { |
ec30e856 | 1422 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1423 | break; |
1424 | } | |
9ceb2426 | 1425 | if (k >= complen) { |
0f113f3e | 1426 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1427 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1428 | SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING); |
1429 | goto f_err; | |
1430 | } | |
1431 | } else if (s->hit) | |
1432 | comp = NULL; | |
1433 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1434 | /* See if we have a match */ |
9ceb2426 MC |
1435 | int m, nn, v, done = 0; |
1436 | unsigned int o; | |
0f113f3e MC |
1437 | |
1438 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1439 | for (m = 0; m < nn; m++) { | |
1440 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1441 | v = comp->id; | |
b2ce0337 | 1442 | for (o = 0; o < complen; o++) { |
ec30e856 | 1443 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1444 | done = 1; |
1445 | break; | |
1446 | } | |
1447 | } | |
1448 | if (done) | |
1449 | break; | |
1450 | } | |
1451 | if (done) | |
1452 | s->s3->tmp.new_compression = comp; | |
1453 | else | |
1454 | comp = NULL; | |
1455 | } | |
e6f418bc | 1456 | #else |
0f113f3e MC |
1457 | /* |
1458 | * If compression is disabled we'd better not try to resume a session | |
1459 | * using compression. | |
1460 | */ | |
1461 | if (s->session->compress_meth != 0) { | |
e27f234a | 1462 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1463 | goto f_err; |
1464 | } | |
09b6c2ef | 1465 | #endif |
413c4f45 | 1466 | |
0f113f3e MC |
1467 | /* |
1468 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1469 | */ | |
d02b48c6 | 1470 | |
0f113f3e | 1471 | if (!s->hit) { |
09b6c2ef | 1472 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1473 | s->session->compress_meth = 0; |
09b6c2ef | 1474 | #else |
0f113f3e | 1475 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1476 | #endif |
25aaa98a | 1477 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1478 | s->session->ciphers = ciphers; |
1479 | if (ciphers == NULL) { | |
3ae91cfb | 1480 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1481 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1482 | goto f_err; |
1483 | } | |
1484 | ciphers = NULL; | |
1485 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1486 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1487 | goto err; |
1488 | } | |
e27f234a MC |
1489 | } |
1490 | ||
1491 | sk_SSL_CIPHER_free(ciphers); | |
1492 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1493 | f_err: | |
1494 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1495 | err: | |
fe3a3291 | 1496 | ossl_statem_set_error(s); |
e27f234a MC |
1497 | |
1498 | sk_SSL_CIPHER_free(ciphers); | |
1499 | return MSG_PROCESS_ERROR; | |
1500 | ||
1501 | } | |
1502 | ||
be3583fa | 1503 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1504 | { |
d13dd4be | 1505 | int al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1506 | SSL_CIPHER *cipher; |
1507 | ||
1508 | if (wst == WORK_MORE_A) { | |
1509 | if (!s->hit) { | |
1510 | /* Let cert callback update server certificates if required */ | |
1511 | if (s->cert->cert_cb) { | |
1512 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1513 | if (rv == 0) { | |
1514 | al = SSL_AD_INTERNAL_ERROR; | |
1515 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1516 | goto f_err; | |
1517 | } | |
1518 | if (rv < 0) { | |
1519 | s->rwstate = SSL_X509_LOOKUP; | |
1520 | return WORK_MORE_A; | |
1521 | } | |
1522 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1523 | } |
e27f234a MC |
1524 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1525 | ||
1526 | if (cipher == NULL) { | |
e27f234a MC |
1527 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
1528 | goto f_err; | |
0f113f3e | 1529 | } |
e27f234a MC |
1530 | s->s3->tmp.new_cipher = cipher; |
1531 | /* check whether we should disable session resumption */ | |
1532 | if (s->not_resumable_session_cb != NULL) | |
1533 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1534 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1535 | if (s->session->not_resumable) | |
1536 | /* do not send a session ticket */ | |
1537 | s->tlsext_ticket_expected = 0; | |
1538 | } else { | |
1539 | /* Session-id reuse */ | |
1540 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1541 | } |
0f113f3e | 1542 | |
28f4580c | 1543 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1544 | if (!ssl3_digest_cached_records(s, 0)) { |
1545 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1546 | goto f_err; |
d13dd4be | 1547 | } |
0f113f3e | 1548 | } |
0f113f3e | 1549 | |
e27f234a MC |
1550 | /*- |
1551 | * we now have the following setup. | |
1552 | * client_random | |
1553 | * cipher_list - our prefered list of ciphers | |
1554 | * ciphers - the clients prefered list of ciphers | |
1555 | * compression - basically ignored right now | |
1556 | * ssl version is set - sslv3 | |
1557 | * s->session - The ssl session has been setup. | |
1558 | * s->hit - session reuse flag | |
1559 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1560 | */ | |
0f113f3e | 1561 | |
e27f234a MC |
1562 | /* Handles TLS extensions that we couldn't check earlier */ |
1563 | if (s->version >= SSL3_VERSION) { | |
1564 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
d13dd4be MC |
1565 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1566 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1567 | goto f_err; |
1568 | } | |
1569 | } | |
0f113f3e | 1570 | |
e27f234a MC |
1571 | wst = WORK_MORE_B; |
1572 | } | |
1573 | #ifndef OPENSSL_NO_SRP | |
1574 | if (wst == WORK_MORE_B) { | |
1575 | int ret; | |
1576 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1577 | /* | |
1578 | * callback indicates further work to be done | |
1579 | */ | |
1580 | s->rwstate = SSL_X509_LOOKUP; | |
1581 | return WORK_MORE_B; | |
1582 | } | |
1583 | if (ret != SSL_ERROR_NONE) { | |
1584 | /* | |
1585 | * This is not really an error but the only means to for | |
1586 | * a client to detect whether srp is supported. | |
1587 | */ | |
1588 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1589 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1590 | SSL_R_CLIENTHELLO_TLSEXT); | |
1591 | goto f_err; | |
0f113f3e MC |
1592 | } |
1593 | } | |
e27f234a MC |
1594 | #endif |
1595 | s->renegotiate = 2; | |
0f113f3e | 1596 | |
e27f234a | 1597 | return WORK_FINISHED_STOP; |
0f113f3e | 1598 | f_err: |
e27f234a | 1599 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1600 | ossl_statem_set_error(s); |
e27f234a MC |
1601 | return WORK_ERROR; |
1602 | } | |
1603 | ||
e27f234a | 1604 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1605 | { |
1606 | unsigned char *buf; | |
1607 | unsigned char *p, *d; | |
1608 | int i, sl; | |
1609 | int al = 0; | |
1610 | unsigned long l; | |
1611 | ||
e27f234a | 1612 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1613 | |
e27f234a MC |
1614 | /* Do the message type and length last */ |
1615 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1616 | |
e27f234a MC |
1617 | *(p++) = s->version >> 8; |
1618 | *(p++) = s->version & 0xff; | |
0f113f3e | 1619 | |
e27f234a MC |
1620 | /* |
1621 | * Random stuff. Filling of the server_random takes place in | |
1622 | * tls_process_client_hello() | |
1623 | */ | |
1624 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1625 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1626 | |
e27f234a MC |
1627 | /*- |
1628 | * There are several cases for the session ID to send | |
1629 | * back in the server hello: | |
1630 | * - For session reuse from the session cache, | |
1631 | * we send back the old session ID. | |
1632 | * - If stateless session reuse (using a session ticket) | |
1633 | * is successful, we send back the client's "session ID" | |
1634 | * (which doesn't actually identify the session). | |
1635 | * - If it is a new session, we send back the new | |
1636 | * session ID. | |
1637 | * - However, if we want the new session to be single-use, | |
1638 | * we send back a 0-length session ID. | |
1639 | * s->hit is non-zero in either case of session reuse, | |
1640 | * so the following won't overwrite an ID that we're supposed | |
1641 | * to send back. | |
1642 | */ | |
1643 | if (s->session->not_resumable || | |
1644 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1645 | && !s->hit)) | |
1646 | s->session->session_id_length = 0; | |
1647 | ||
1648 | sl = s->session->session_id_length; | |
1649 | if (sl > (int)sizeof(s->session->session_id)) { | |
1650 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1651 | ossl_statem_set_error(s); |
e27f234a MC |
1652 | return 0; |
1653 | } | |
1654 | *(p++) = sl; | |
1655 | memcpy(p, s->session->session_id, sl); | |
1656 | p += sl; | |
0f113f3e | 1657 | |
e27f234a MC |
1658 | /* put the cipher */ |
1659 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1660 | p += i; | |
0f113f3e | 1661 | |
e27f234a | 1662 | /* put the compression method */ |
09b6c2ef | 1663 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1664 | *(p++) = 0; |
09b6c2ef | 1665 | #else |
e27f234a MC |
1666 | if (s->s3->tmp.new_compression == NULL) |
1667 | *(p++) = 0; | |
1668 | else | |
1669 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1670 | #endif |
e481f9b9 | 1671 | |
e27f234a MC |
1672 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1673 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1674 | ossl_statem_set_error(s); |
e27f234a MC |
1675 | return 0; |
1676 | } | |
1677 | if ((p = | |
1678 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1679 | &al)) == NULL) { | |
1680 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1681 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1682 | ossl_statem_set_error(s); |
e27f234a MC |
1683 | return 0; |
1684 | } | |
e481f9b9 | 1685 | |
e27f234a MC |
1686 | /* do the header */ |
1687 | l = (p - d); | |
1688 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1689 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1690 | ossl_statem_set_error(s); |
e27f234a | 1691 | return 0; |
0f113f3e | 1692 | } |
d02b48c6 | 1693 | |
e27f234a | 1694 | return 1; |
0f113f3e | 1695 | } |
d02b48c6 | 1696 | |
e27f234a MC |
1697 | int tls_construct_server_done(SSL *s) |
1698 | { | |
1699 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1700 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1701 | ossl_statem_set_error(s); |
e27f234a MC |
1702 | return 0; |
1703 | } | |
1704 | ||
1705 | if (!s->s3->tmp.cert_request) { | |
1706 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1707 | ossl_statem_set_error(s); |
e27f234a MC |
1708 | } |
1709 | } | |
1710 | ||
1711 | return 1; | |
1712 | } | |
1713 | ||
e27f234a | 1714 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1715 | { |
bc36ee62 | 1716 | #ifndef OPENSSL_NO_DH |
0f113f3e | 1717 | DH *dh = NULL, *dhp; |
ea262260 | 1718 | #endif |
10bf4fc2 | 1719 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1720 | unsigned char *encodedPoint = NULL; |
1721 | int encodedlen = 0; | |
1722 | int curve_id = 0; | |
d02b48c6 | 1723 | #endif |
0f113f3e MC |
1724 | EVP_PKEY *pkey; |
1725 | const EVP_MD *md = NULL; | |
1726 | unsigned char *p, *d; | |
1727 | int al, i; | |
1728 | unsigned long type; | |
1729 | int n; | |
0f113f3e MC |
1730 | BIGNUM *r[4]; |
1731 | int nr[4], kn; | |
1732 | BUF_MEM *buf; | |
bfb0641f | 1733 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
0f113f3e | 1734 | |
6e59a892 RL |
1735 | if (md_ctx == NULL) { |
1736 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
1737 | al = SSL_AD_INTERNAL_ERROR; | |
1738 | goto f_err; | |
1739 | } | |
0f113f3e | 1740 | |
e27f234a | 1741 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a MC |
1742 | |
1743 | buf = s->init_buf; | |
0f113f3e | 1744 | |
e27f234a MC |
1745 | r[0] = r[1] = r[2] = r[3] = NULL; |
1746 | n = 0; | |
85269210 | 1747 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1748 | if (type & SSL_PSK) { |
1749 | /* | |
1750 | * reserve size for record length and PSK identity hint | |
1751 | */ | |
1752 | n += 2; | |
1753 | if (s->cert->psk_identity_hint) | |
1754 | n += strlen(s->cert->psk_identity_hint); | |
1755 | } | |
1756 | /* Plain PSK or RSAPSK nothing to do */ | |
1757 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1758 | } else | |
85269210 | 1759 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1760 | #ifndef OPENSSL_NO_DH |
e27f234a | 1761 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
1762 | CERT *cert = s->cert; |
1763 | ||
e27f234a MC |
1764 | if (s->cert->dh_tmp_auto) { |
1765 | dhp = ssl_get_auto_dh(s); | |
0f113f3e | 1766 | if (dhp == NULL) { |
e27f234a MC |
1767 | al = SSL_AD_INTERNAL_ERROR; |
1768 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1769 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1770 | goto f_err; |
0f113f3e | 1771 | } |
e27f234a MC |
1772 | } else |
1773 | dhp = cert->dh_tmp; | |
1774 | if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) | |
361a1191 | 1775 | dhp = s->cert->dh_tmp_cb(s, 0, 1024); |
e27f234a MC |
1776 | if (dhp == NULL) { |
1777 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1778 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1779 | SSL_R_MISSING_TMP_DH_KEY); | |
1780 | goto f_err; | |
1781 | } | |
1782 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
1783 | DH_security_bits(dhp), 0, dhp)) { | |
1784 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1785 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1786 | SSL_R_DH_KEY_TOO_SMALL); | |
1787 | goto f_err; | |
1788 | } | |
1789 | if (s->s3->tmp.dh != NULL) { | |
1790 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1791 | ERR_R_INTERNAL_ERROR); | |
1792 | goto err; | |
1793 | } | |
0f113f3e | 1794 | |
e27f234a MC |
1795 | if (s->cert->dh_tmp_auto) |
1796 | dh = dhp; | |
1797 | else if ((dh = DHparams_dup(dhp)) == NULL) { | |
1798 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1799 | goto err; | |
1800 | } | |
1801 | ||
1802 | s->s3->tmp.dh = dh; | |
1803 | if ((dhp->pub_key == NULL || | |
1804 | dhp->priv_key == NULL || | |
1805 | (s->options & SSL_OP_SINGLE_DH_USE))) { | |
1806 | if (!DH_generate_key(dh)) { | |
1807 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
0f113f3e MC |
1808 | goto err; |
1809 | } | |
e27f234a MC |
1810 | } else { |
1811 | dh->pub_key = BN_dup(dhp->pub_key); | |
1812 | dh->priv_key = BN_dup(dhp->priv_key); | |
1813 | if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { | |
1814 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1815 | goto err; | |
0f113f3e | 1816 | } |
e27f234a MC |
1817 | } |
1818 | r[0] = dh->p; | |
1819 | r[1] = dh->g; | |
1820 | r[2] = dh->pub_key; | |
1821 | } else | |
d02b48c6 | 1822 | #endif |
10bf4fc2 | 1823 | #ifndef OPENSSL_NO_EC |
e27f234a | 1824 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 1825 | int nid; |
e27f234a | 1826 | |
880d9d86 | 1827 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1828 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1829 | ERR_R_INTERNAL_ERROR); | |
1830 | goto err; | |
1831 | } | |
1832 | ||
57be4444 DSH |
1833 | /* Get NID of appropriate shared curve */ |
1834 | nid = tls1_shared_curve(s, -2); | |
1835 | curve_id = tls1_ec_nid2curve_id(nid); | |
1836 | if (curve_id == 0) { | |
e27f234a MC |
1837 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1838 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1839 | goto err; | |
1840 | } | |
880d9d86 DSH |
1841 | s->s3->tmp.pkey = ssl_generate_pkey(NULL, nid); |
1842 | /* Generate a new key for this curve */ | |
1843 | if (s->s3->tmp.pkey == NULL) { | |
57be4444 | 1844 | al = SSL_AD_INTERNAL_ERROR; |
880d9d86 | 1845 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
1846 | goto f_err; |
1847 | } | |
1848 | ||
880d9d86 DSH |
1849 | /* Encode the public key. */ |
1850 | encodedlen = EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(s->s3->tmp.pkey), | |
1851 | POINT_CONVERSION_UNCOMPRESSED, | |
cae41364 | 1852 | &encodedPoint, NULL); |
0f113f3e | 1853 | |
e27f234a | 1854 | if (encodedlen == 0) { |
cae41364 | 1855 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
1856 | goto err; |
1857 | } | |
0f113f3e | 1858 | |
e27f234a | 1859 | /* |
57be4444 DSH |
1860 | * We only support named (not generic) curves in ECDH ephemeral key |
1861 | * exchanges. In this situation, we need four additional bytes to | |
1862 | * encode the entire ServerECDHParams structure. | |
e27f234a MC |
1863 | */ |
1864 | n += 4 + encodedlen; | |
0f113f3e | 1865 | |
e27f234a MC |
1866 | /* |
1867 | * We'll generate the serverKeyExchange message explicitly so we | |
1868 | * can set these to NULLs | |
1869 | */ | |
1870 | r[0] = NULL; | |
1871 | r[1] = NULL; | |
1872 | r[2] = NULL; | |
1873 | r[3] = NULL; | |
1874 | } else | |
10bf4fc2 | 1875 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1876 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1877 | if (type & SSL_kSRP) { |
1878 | if ((s->srp_ctx.N == NULL) || | |
1879 | (s->srp_ctx.g == NULL) || | |
1880 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1881 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1882 | SSL_R_MISSING_SRP_PARAM); | |
1883 | goto err; | |
0f113f3e | 1884 | } |
e27f234a MC |
1885 | r[0] = s->srp_ctx.N; |
1886 | r[1] = s->srp_ctx.g; | |
1887 | r[2] = s->srp_ctx.s; | |
1888 | r[3] = s->srp_ctx.B; | |
1889 | } else | |
1890 | #endif | |
1891 | { | |
1892 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1893 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1894 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1895 | goto f_err; | |
1896 | } | |
1897 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
1898 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 1899 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1900 | if ((i == 2) && (type & SSL_kSRP)) |
1901 | n += 1 + nr[i]; | |
1902 | else | |
edc032b5 | 1903 | #endif |
e27f234a MC |
1904 | n += 2 + nr[i]; |
1905 | } | |
0f113f3e | 1906 | |
e27f234a MC |
1907 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
1908 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
1909 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1910 | == NULL) { | |
1911 | al = SSL_AD_DECODE_ERROR; | |
1912 | goto f_err; | |
0f113f3e | 1913 | } |
e27f234a MC |
1914 | kn = EVP_PKEY_size(pkey); |
1915 | } else { | |
1916 | pkey = NULL; | |
1917 | kn = 0; | |
1918 | } | |
0f113f3e | 1919 | |
e27f234a MC |
1920 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
1921 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
1922 | goto err; | |
1923 | } | |
1924 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1925 | |
85269210 | 1926 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1927 | if (type & SSL_PSK) { |
1928 | /* copy PSK identity hint */ | |
1929 | if (s->cert->psk_identity_hint) { | |
1930 | s2n(strlen(s->cert->psk_identity_hint), p); | |
1931 | strncpy((char *)p, s->cert->psk_identity_hint, | |
1932 | strlen(s->cert->psk_identity_hint)); | |
1933 | p += strlen(s->cert->psk_identity_hint); | |
1934 | } else { | |
1935 | s2n(0, p); | |
85269210 | 1936 | } |
e27f234a | 1937 | } |
85269210 DSH |
1938 | #endif |
1939 | ||
e27f234a | 1940 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 1941 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1942 | if ((i == 2) && (type & SSL_kSRP)) { |
1943 | *p = nr[i]; | |
1944 | p++; | |
1945 | } else | |
edc032b5 | 1946 | #endif |
e27f234a MC |
1947 | s2n(nr[i], p); |
1948 | BN_bn2bin(r[i], p); | |
1949 | p += nr[i]; | |
1950 | } | |
d02b48c6 | 1951 | |
10bf4fc2 | 1952 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1953 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1954 | /* | |
1955 | * XXX: For now, we only support named (not generic) curves. In | |
1956 | * this situation, the serverKeyExchange message has: [1 byte | |
1957 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
1958 | * point], followed by the actual encoded point itself | |
1959 | */ | |
1960 | *p = NAMED_CURVE_TYPE; | |
1961 | p += 1; | |
1962 | *p = 0; | |
1963 | p += 1; | |
1964 | *p = curve_id; | |
1965 | p += 1; | |
1966 | *p = encodedlen; | |
1967 | p += 1; | |
1968 | memcpy(p, encodedPoint, encodedlen); | |
1969 | OPENSSL_free(encodedPoint); | |
1970 | encodedPoint = NULL; | |
1971 | p += encodedlen; | |
1972 | } | |
ea262260 BM |
1973 | #endif |
1974 | ||
e27f234a MC |
1975 | /* not anonymous */ |
1976 | if (pkey != NULL) { | |
1977 | /* | |
1978 | * n is the length of the params, they start at &(d[4]) and p | |
1979 | * points to the space at the end. | |
1980 | */ | |
e27f234a MC |
1981 | if (md) { |
1982 | /* send signature algorithm */ | |
1983 | if (SSL_USE_SIGALGS(s)) { | |
1984 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
1985 | /* Should never happen */ | |
1986 | al = SSL_AD_INTERNAL_ERROR; | |
1987 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1988 | ERR_R_INTERNAL_ERROR); | |
1989 | goto f_err; | |
0f113f3e | 1990 | } |
e27f234a MC |
1991 | p += 2; |
1992 | } | |
a2f9200f | 1993 | #ifdef SSL_DEBUG |
e27f234a | 1994 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 1995 | #endif |
6e59a892 RL |
1996 | if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0 |
1997 | || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]), | |
5f3d93e4 | 1998 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 | 1999 | || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]), |
5f3d93e4 | 2000 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 RL |
2001 | || EVP_SignUpdate(md_ctx, d, n) <= 0 |
2002 | || EVP_SignFinal(md_ctx, &(p[2]), | |
5f3d93e4 | 2003 | (unsigned int *)&i, pkey) <= 0) { |
e27f234a | 2004 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); |
5f3d93e4 MC |
2005 | al = SSL_AD_INTERNAL_ERROR; |
2006 | goto f_err; | |
0f113f3e | 2007 | } |
e27f234a MC |
2008 | s2n(i, p); |
2009 | n += i + 2; | |
2010 | if (SSL_USE_SIGALGS(s)) | |
2011 | n += 2; | |
2012 | } else { | |
2013 | /* Is this error check actually needed? */ | |
77d514c5 | 2014 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
2015 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2016 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
2017 | goto f_err; |
2018 | } | |
0f113f3e MC |
2019 | } |
2020 | ||
e27f234a MC |
2021 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
2022 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2023 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2024 | goto f_err; | |
2025 | } | |
2026 | ||
bfb0641f | 2027 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 2028 | return 1; |
0f113f3e MC |
2029 | f_err: |
2030 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2031 | err: | |
556efe79 | 2032 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 2033 | OPENSSL_free(encodedPoint); |
ea262260 | 2034 | #endif |
bfb0641f | 2035 | EVP_MD_CTX_free(md_ctx); |
fe3a3291 | 2036 | ossl_statem_set_error(s); |
e27f234a | 2037 | return 0; |
0f113f3e | 2038 | } |
d02b48c6 | 2039 | |
e27f234a | 2040 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
2041 | { |
2042 | unsigned char *p, *d; | |
2043 | int i, j, nl, off, n; | |
2044 | STACK_OF(X509_NAME) *sk = NULL; | |
2045 | X509_NAME *name; | |
2046 | BUF_MEM *buf; | |
2047 | ||
e27f234a | 2048 | buf = s->init_buf; |
0f113f3e | 2049 | |
e27f234a | 2050 | d = p = ssl_handshake_start(s); |
0f113f3e | 2051 | |
e27f234a MC |
2052 | /* get the list of acceptable cert types */ |
2053 | p++; | |
2054 | n = ssl3_get_req_cert_type(s, p); | |
2055 | d[0] = n; | |
2056 | p += n; | |
2057 | n++; | |
0f113f3e | 2058 | |
e27f234a MC |
2059 | if (SSL_USE_SIGALGS(s)) { |
2060 | const unsigned char *psigs; | |
2061 | unsigned char *etmp = p; | |
2062 | nl = tls12_get_psigalgs(s, &psigs); | |
2063 | /* Skip over length for now */ | |
0f113f3e | 2064 | p += 2; |
e27f234a MC |
2065 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
2066 | /* Now fill in length */ | |
2067 | s2n(nl, etmp); | |
2068 | p += nl; | |
2069 | n += nl + 2; | |
2070 | } | |
0f113f3e | 2071 | |
e27f234a MC |
2072 | off = n; |
2073 | p += 2; | |
2074 | n += 2; | |
2075 | ||
2076 | sk = SSL_get_client_CA_list(s); | |
2077 | nl = 0; | |
2078 | if (sk != NULL) { | |
2079 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
2080 | name = sk_X509_NAME_value(sk, i); | |
2081 | j = i2d_X509_NAME(name, NULL); | |
2082 | if (!BUF_MEM_grow_clean | |
2083 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
2084 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2085 | ERR_R_BUF_LIB); | |
2086 | goto err; | |
0f113f3e | 2087 | } |
e27f234a MC |
2088 | p = ssl_handshake_start(s) + n; |
2089 | s2n(j, p); | |
2090 | i2d_X509_NAME(name, &p); | |
2091 | n += 2 + j; | |
2092 | nl += 2 + j; | |
0f113f3e | 2093 | } |
e27f234a MC |
2094 | } |
2095 | /* else no CA names */ | |
2096 | p = ssl_handshake_start(s) + off; | |
2097 | s2n(nl, p); | |
d02b48c6 | 2098 | |
e27f234a MC |
2099 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2100 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2101 | goto err; | |
0f113f3e | 2102 | } |
d02b48c6 | 2103 | |
e27f234a MC |
2104 | s->s3->tmp.cert_request = 1; |
2105 | ||
2106 | return 1; | |
0f113f3e | 2107 | err: |
fe3a3291 | 2108 | ossl_statem_set_error(s); |
e27f234a | 2109 | return 0; |
0f113f3e | 2110 | } |
d02b48c6 | 2111 | |
be3583fa | 2112 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
e27f234a MC |
2113 | { |
2114 | int al; | |
2115 | unsigned int i; | |
0f113f3e | 2116 | unsigned long alg_k; |
bc36ee62 | 2117 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
2118 | RSA *rsa = NULL; |
2119 | EVP_PKEY *pkey = NULL; | |
79df9d62 | 2120 | #endif |
bc36ee62 | 2121 | #ifndef OPENSSL_NO_DH |
0f113f3e | 2122 | BIGNUM *pub = NULL; |
bc71f910 | 2123 | DH *dh_srvr; |
58964a49 | 2124 | #endif |
556efe79 | 2125 | #ifndef OPENSSL_NO_EC |
880d9d86 | 2126 | EVP_PKEY *ckey = NULL; |
ea262260 | 2127 | #endif |
73999b62 | 2128 | PACKET enc_premaster; |
20ca916d | 2129 | unsigned char *data, *rsa_decrypt = NULL; |
ea262260 | 2130 | |
0f113f3e | 2131 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
d02b48c6 | 2132 | |
85269210 DSH |
2133 | #ifndef OPENSSL_NO_PSK |
2134 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2135 | if (alg_k & SSL_PSK) { | |
2136 | unsigned char psk[PSK_MAX_PSK_LEN]; | |
2137 | size_t psklen; | |
73999b62 | 2138 | PACKET psk_identity; |
efcdbcbe | 2139 | |
73999b62 | 2140 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
85269210 | 2141 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2142 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2143 | goto f_err; |
2144 | } | |
6d41fc80 | 2145 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { |
85269210 | 2146 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2147 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2148 | SSL_R_DATA_LENGTH_TOO_LONG); |
2149 | goto f_err; | |
2150 | } | |
2151 | if (s->psk_server_callback == NULL) { | |
2152 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2153 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2154 | SSL_R_PSK_NO_SERVER_CB); |
2155 | goto f_err; | |
2156 | } | |
2157 | ||
6d41fc80 | 2158 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
f0659bdb | 2159 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 | 2160 | al = SSL_AD_INTERNAL_ERROR; |
efcdbcbe MC |
2161 | goto f_err; |
2162 | } | |
85269210 DSH |
2163 | |
2164 | psklen = s->psk_server_callback(s, s->session->psk_identity, | |
2165 | psk, sizeof(psk)); | |
2166 | ||
2167 | if (psklen > PSK_MAX_PSK_LEN) { | |
2168 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2169 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2170 | goto f_err; |
2171 | } else if (psklen == 0) { | |
2172 | /* | |
2173 | * PSK related to the given identity not found | |
2174 | */ | |
e27f234a | 2175 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2176 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2177 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2178 | goto f_err; | |
2179 | } | |
2180 | ||
2181 | OPENSSL_free(s->s3->tmp.psk); | |
7644a9ae | 2182 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); |
85269210 DSH |
2183 | OPENSSL_cleanse(psk, psklen); |
2184 | ||
2185 | if (s->s3->tmp.psk == NULL) { | |
2186 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2187 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
85269210 DSH |
2188 | goto f_err; |
2189 | } | |
2190 | ||
2191 | s->s3->tmp.psklen = psklen; | |
85269210 DSH |
2192 | } |
2193 | if (alg_k & SSL_kPSK) { | |
2194 | /* Identity extracted earlier: should be nothing left */ | |
73999b62 | 2195 | if (PACKET_remaining(pkt) != 0) { |
85269210 | 2196 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2197 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2198 | goto f_err; |
2199 | } | |
2200 | /* PSK handled by ssl_generate_master_secret */ | |
2201 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
2202 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2203 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2204 | goto f_err; |
2205 | } | |
2206 | } else | |
2207 | #endif | |
bc36ee62 | 2208 | #ifndef OPENSSL_NO_RSA |
85269210 | 2209 | if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
0f113f3e MC |
2210 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2211 | int decrypt_len; | |
2212 | unsigned char decrypt_good, version_good; | |
2213 | size_t j; | |
2214 | ||
2215 | /* FIX THIS UP EAY EAY EAY EAY */ | |
361a1191 KR |
2216 | pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; |
2217 | if ((pkey == NULL) || | |
2218 | (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { | |
2219 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2220 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2221 | SSL_R_MISSING_RSA_CERTIFICATE); | |
2222 | goto f_err; | |
0f113f3e | 2223 | } |
361a1191 | 2224 | rsa = pkey->pkey.rsa; |
0f113f3e | 2225 | |
20ca916d EK |
2226 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ |
2227 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
73999b62 | 2228 | enc_premaster = *pkt; |
20ca916d | 2229 | } else { |
73999b62 MC |
2230 | PACKET orig = *pkt; |
2231 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) | |
2232 | || PACKET_remaining(pkt) != 0) { | |
20ca916d EK |
2233 | /* Try SSLv3 behaviour for TLS. */ |
2234 | if (s->options & SSL_OP_TLS_D5_BUG) { | |
2235 | enc_premaster = orig; | |
2236 | } else { | |
0f113f3e | 2237 | al = SSL_AD_DECODE_ERROR; |
f0659bdb MC |
2238 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2239 | SSL_R_LENGTH_MISMATCH); | |
0f113f3e | 2240 | goto f_err; |
efcdbcbe MC |
2241 | } |
2242 | } | |
0f113f3e MC |
2243 | } |
2244 | ||
2245 | /* | |
20ca916d EK |
2246 | * We want to be sure that the plaintext buffer size makes it safe to |
2247 | * iterate over the entire size of a premaster secret | |
2248 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2249 | * their ciphertext cannot accommodate a premaster secret anyway. | |
0f113f3e | 2250 | */ |
20ca916d EK |
2251 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { |
2252 | al = SSL_AD_INTERNAL_ERROR; | |
f0659bdb | 2253 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
20ca916d | 2254 | RSA_R_KEY_SIZE_TOO_SMALL); |
0f113f3e MC |
2255 | goto f_err; |
2256 | } | |
2257 | ||
20ca916d EK |
2258 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2259 | if (rsa_decrypt == NULL) { | |
efcdbcbe | 2260 | al = SSL_AD_INTERNAL_ERROR; |
f0659bdb | 2261 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2262 | goto f_err; |
2263 | } | |
20ca916d | 2264 | |
0f113f3e MC |
2265 | /* |
2266 | * We must not leak whether a decryption failure occurs because of | |
2267 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2268 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2269 | * generates a random premaster secret for the case that the decrypt | |
2270 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2271 | */ | |
2272 | ||
266483d2 | 2273 | if (RAND_bytes(rand_premaster_secret, |
20ca916d | 2274 | sizeof(rand_premaster_secret)) <= 0) { |
0f113f3e | 2275 | goto err; |
20ca916d EK |
2276 | } |
2277 | ||
2278 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2279 | PACKET_data(&enc_premaster), | |
2280 | rsa_decrypt, rsa, RSA_PKCS1_PADDING); | |
0f113f3e MC |
2281 | ERR_clear_error(); |
2282 | ||
2283 | /* | |
2284 | * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will | |
2285 | * be 0xff if so and zero otherwise. | |
2286 | */ | |
2287 | decrypt_good = | |
2288 | constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); | |
2289 | ||
2290 | /* | |
2291 | * If the version in the decrypted pre-master secret is correct then | |
2292 | * version_good will be 0xff, otherwise it'll be zero. The | |
2293 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2294 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2295 | * check as a "bad version oracle". Thus version checks are done in | |
2296 | * constant time and are treated like any other decryption error. | |
2297 | */ | |
2298 | version_good = | |
20ca916d EK |
2299 | constant_time_eq_8(rsa_decrypt[0], |
2300 | (unsigned)(s->client_version >> 8)); | |
0f113f3e | 2301 | version_good &= |
20ca916d EK |
2302 | constant_time_eq_8(rsa_decrypt[1], |
2303 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e MC |
2304 | |
2305 | /* | |
2306 | * The premaster secret must contain the same version number as the | |
2307 | * ClientHello to detect version rollback attacks (strangely, the | |
2308 | * protocol does not offer such protection for DH ciphersuites). | |
2309 | * However, buggy clients exist that send the negotiated protocol | |
2310 | * version instead if the server does not support the requested | |
2311 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2312 | * clients. | |
2313 | */ | |
2314 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2315 | unsigned char workaround_good; | |
2316 | workaround_good = | |
20ca916d | 2317 | constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8)); |
0f113f3e | 2318 | workaround_good &= |
20ca916d EK |
2319 | constant_time_eq_8(rsa_decrypt[1], |
2320 | (unsigned)(s->version & 0xff)); | |
0f113f3e MC |
2321 | version_good |= workaround_good; |
2322 | } | |
2323 | ||
2324 | /* | |
2325 | * Both decryption and version must be good for decrypt_good to | |
2326 | * remain non-zero (0xff). | |
2327 | */ | |
2328 | decrypt_good &= version_good; | |
2329 | ||
2330 | /* | |
2331 | * Now copy rand_premaster_secret over from p using | |
2332 | * decrypt_good_mask. If decryption failed, then p does not | |
2333 | * contain valid plaintext, however, a check above guarantees | |
2334 | * it is still sufficiently large to read from. | |
2335 | */ | |
2336 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
20ca916d EK |
2337 | rsa_decrypt[j] = |
2338 | constant_time_select_8(decrypt_good, rsa_decrypt[j], | |
2339 | rand_premaster_secret[j]); | |
0f113f3e MC |
2340 | } |
2341 | ||
20ca916d EK |
2342 | if (!ssl_generate_master_secret(s, rsa_decrypt, |
2343 | sizeof(rand_premaster_secret), 0)) { | |
69f68237 | 2344 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2345 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2346 | goto f_err; |
2347 | } | |
20ca916d EK |
2348 | OPENSSL_free(rsa_decrypt); |
2349 | rsa_decrypt = NULL; | |
0f113f3e | 2350 | } else |
4c5fac4a | 2351 | #endif |
bc36ee62 | 2352 | #ifndef OPENSSL_NO_DH |
bc71f910 | 2353 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
efcdbcbe MC |
2354 | unsigned char shared[(OPENSSL_DH_MAX_MODULUS_BITS + 7) / 8]; |
2355 | ||
73999b62 | 2356 | if (!PACKET_get_net_2(pkt, &i)) { |
85269210 | 2357 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
d3cc5e61 | 2358 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2359 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
d3cc5e61 MC |
2360 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2361 | goto f_err; | |
2362 | } | |
0f113f3e | 2363 | i = 0; |
d3cc5e61 | 2364 | } |
73999b62 | 2365 | if (PACKET_remaining(pkt) != i) { |
7538cb82 DSH |
2366 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2367 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); | |
2368 | goto err; | |
0f113f3e | 2369 | } |
bc71f910 | 2370 | if (s->s3->tmp.dh == NULL) { |
0f113f3e | 2371 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2372 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2373 | SSL_R_MISSING_TMP_DH_KEY); |
2374 | goto f_err; | |
2375 | } else | |
2376 | dh_srvr = s->s3->tmp.dh; | |
2377 | ||
73999b62 | 2378 | if (PACKET_remaining(pkt) == 0L) { |
bc71f910 DSH |
2379 | al = SSL_AD_HANDSHAKE_FAILURE; |
2380 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2381 | SSL_R_MISSING_TMP_DH_KEY); | |
2382 | goto f_err; | |
2383 | } | |
2384 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2385 | /* We already checked we have enough data */ | |
2386 | al = SSL_AD_INTERNAL_ERROR; | |
2387 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2388 | ERR_R_INTERNAL_ERROR); | |
2389 | goto f_err; | |
efcdbcbe | 2390 | } |
bc71f910 | 2391 | pub = BN_bin2bn(data, i, NULL); |
0f113f3e | 2392 | if (pub == NULL) { |
e27f234a | 2393 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); |
0f113f3e MC |
2394 | goto err; |
2395 | } | |
2396 | ||
efcdbcbe | 2397 | i = DH_compute_key(shared, pub, dh_srvr); |
0f113f3e MC |
2398 | |
2399 | if (i <= 0) { | |
e27f234a | 2400 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
0f113f3e MC |
2401 | BN_clear_free(pub); |
2402 | goto err; | |
2403 | } | |
2404 | ||
2405 | DH_free(s->s3->tmp.dh); | |
2406 | s->s3->tmp.dh = NULL; | |
bc71f910 | 2407 | BN_clear_free(pub); |
0f113f3e | 2408 | pub = NULL; |
efcdbcbe | 2409 | if (!ssl_generate_master_secret(s, shared, i, 0)) { |
69f68237 | 2410 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2411 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2412 | goto f_err; |
2413 | } | |
0f113f3e | 2414 | } else |
d02b48c6 | 2415 | #endif |
ea262260 | 2416 | |
556efe79 | 2417 | #ifndef OPENSSL_NO_EC |
85269210 | 2418 | if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) { |
880d9d86 | 2419 | EVP_PKEY *skey = NULL; |
0f113f3e | 2420 | |
0f113f3e MC |
2421 | /* Let's get server private key and group information */ |
2422 | if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { | |
2423 | /* use the certificate */ | |
880d9d86 | 2424 | skey = s->cert->pkeys[SSL_PKEY_ECC].privatekey; |
0f113f3e MC |
2425 | } else { |
2426 | /* | |
2427 | * use the ephermeral values we saved when generating the | |
2428 | * ServerKeyExchange msg. | |
2429 | */ | |
880d9d86 | 2430 | skey = s->s3->tmp.pkey; |
0f113f3e MC |
2431 | } |
2432 | ||
73999b62 | 2433 | if (PACKET_remaining(pkt) == 0L) { |
c66ce5eb DSH |
2434 | /* We don't support ECDH client auth */ |
2435 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2436 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2437 | SSL_R_MISSING_TMP_ECDH_KEY); | |
2438 | goto f_err; | |
0f113f3e MC |
2439 | } else { |
2440 | /* | |
2441 | * Get client's public key from encoded point in the | |
2442 | * ClientKeyExchange message. | |
2443 | */ | |
0f113f3e MC |
2444 | |
2445 | /* Get encoded point length */ | |
73999b62 | 2446 | if (!PACKET_get_1(pkt, &i)) { |
efcdbcbe | 2447 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2448 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2449 | SSL_R_LENGTH_MISMATCH); |
2450 | goto f_err; | |
2451 | } | |
73999b62 MC |
2452 | if (!PACKET_get_bytes(pkt, &data, i) |
2453 | || PACKET_remaining(pkt) != 0) { | |
e27f234a | 2454 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2455 | goto err; |
2456 | } | |
880d9d86 DSH |
2457 | ckey = EVP_PKEY_new(); |
2458 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
2459 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
2460 | goto err; | |
2461 | } | |
2462 | if (EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(ckey), data, i, | |
2463 | NULL) == 0) { | |
e27f234a | 2464 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2465 | goto err; |
2466 | } | |
0f113f3e MC |
2467 | } |
2468 | ||
880d9d86 | 2469 | if (ssl_derive(s, skey, ckey) == 0) { |
69f68237 | 2470 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2471 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2472 | goto f_err; |
2473 | } | |
880d9d86 DSH |
2474 | |
2475 | EVP_PKEY_free(ckey); | |
2476 | ckey = NULL; | |
2477 | ||
e27f234a | 2478 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2479 | } else |
ddac1974 | 2480 | #endif |
edc032b5 | 2481 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 2482 | if (alg_k & SSL_kSRP) { |
73999b62 MC |
2483 | if (!PACKET_get_net_2(pkt, &i) |
2484 | || !PACKET_get_bytes(pkt, &data, i)) { | |
0f113f3e | 2485 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2486 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); |
0f113f3e MC |
2487 | goto f_err; |
2488 | } | |
efcdbcbe | 2489 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { |
e27f234a | 2490 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); |
0f113f3e MC |
2491 | goto err; |
2492 | } | |
2493 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2494 | || BN_is_zero(s->srp_ctx.A)) { | |
2495 | al = SSL_AD_ILLEGAL_PARAMETER; | |
e27f234a | 2496 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2497 | SSL_R_BAD_SRP_PARAMETERS); |
2498 | goto f_err; | |
2499 | } | |
b548a1f1 | 2500 | OPENSSL_free(s->session->srp_username); |
7644a9ae | 2501 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); |
0f113f3e | 2502 | if (s->session->srp_username == NULL) { |
e27f234a | 2503 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2504 | goto err; |
2505 | } | |
2506 | ||
57b272b0 | 2507 | if (!srp_generate_server_master_secret(s)) { |
e27f234a | 2508 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
2509 | goto err; |
2510 | } | |
0f113f3e MC |
2511 | } else |
2512 | #endif /* OPENSSL_NO_SRP */ | |
2a9b9654 | 2513 | #ifndef OPENSSL_NO_GOST |
0f113f3e | 2514 | if (alg_k & SSL_kGOST) { |
0f113f3e MC |
2515 | EVP_PKEY_CTX *pkey_ctx; |
2516 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2517 | unsigned char premaster_secret[32], *start; | |
2518 | size_t outlen = 32, inlen; | |
2519 | unsigned long alg_a; | |
2520 | int Ttag, Tclass; | |
2521 | long Tlen; | |
73999b62 | 2522 | long sess_key_len; |
0f113f3e MC |
2523 | |
2524 | /* Get our certificate private key */ | |
2525 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
e44380a9 DB |
2526 | if (alg_a & SSL_aGOST12) { |
2527 | /* | |
2528 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2529 | */ | |
2530 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2531 | if (pk == NULL) { | |
2532 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2533 | } | |
2534 | if (pk == NULL) { | |
2535 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2536 | } | |
2537 | } else if (alg_a & SSL_aGOST01) { | |
0f113f3e | 2538 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; |
e44380a9 | 2539 | } |
0f113f3e MC |
2540 | |
2541 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
a71edf3b MC |
2542 | if (pkey_ctx == NULL) { |
2543 | al = SSL_AD_INTERNAL_ERROR; | |
2544 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2545 | goto f_err; | |
2546 | } | |
5f3d93e4 MC |
2547 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { |
2548 | al = SSL_AD_INTERNAL_ERROR; | |
2549 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2550 | goto f_err; | |
2551 | } | |
0f113f3e MC |
2552 | /* |
2553 | * If client certificate is present and is of the same type, maybe | |
2554 | * use it for key exchange. Don't mind errors from | |
2555 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2556 | * client certificate for authorization only. | |
2557 | */ | |
2558 | client_pub_pkey = X509_get_pubkey(s->session->peer); | |
2559 | if (client_pub_pkey) { | |
2560 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2561 | ERR_clear_error(); | |
2562 | } | |
2563 | /* Decrypt session key */ | |
73999b62 MC |
2564 | sess_key_len = PACKET_remaining(pkt); |
2565 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
efcdbcbe | 2566 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2567 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2568 | goto gerr; |
efcdbcbe | 2569 | } |
73999b62 MC |
2570 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, |
2571 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2572 | || Ttag != V_ASN1_SEQUENCE | |
0f113f3e | 2573 | || Tclass != V_ASN1_UNIVERSAL) { |
5f3d93e4 | 2574 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2575 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2576 | SSL_R_DECRYPTION_FAILED); |
2577 | goto gerr; | |
2578 | } | |
efcdbcbe | 2579 | start = data; |
0f113f3e MC |
2580 | inlen = Tlen; |
2581 | if (EVP_PKEY_decrypt | |
2582 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
ba4f1331 | 2583 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2584 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2585 | SSL_R_DECRYPTION_FAILED); |
2586 | goto gerr; | |
2587 | } | |
2588 | /* Generate master secret */ | |
57b272b0 DSH |
2589 | if (!ssl_generate_master_secret(s, premaster_secret, |
2590 | sizeof(premaster_secret), 0)) { | |
69f68237 | 2591 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2592 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2593 | goto gerr; |
69f68237 | 2594 | } |
0f113f3e MC |
2595 | /* Check if pubkey from client certificate was used */ |
2596 | if (EVP_PKEY_CTX_ctrl | |
2597 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
a71a4966 | 2598 | s->statem.no_cert_verify = 1; |
e27f234a MC |
2599 | |
2600 | EVP_PKEY_free(client_pub_pkey); | |
2601 | EVP_PKEY_CTX_free(pkey_ctx); | |
2602 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
0f113f3e MC |
2603 | gerr: |
2604 | EVP_PKEY_free(client_pub_pkey); | |
2605 | EVP_PKEY_CTX_free(pkey_ctx); | |
5f3d93e4 | 2606 | goto f_err; |
2a9b9654 MC |
2607 | } else |
2608 | #endif | |
2609 | { | |
0f113f3e | 2610 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2611 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
0f113f3e MC |
2612 | goto f_err; |
2613 | } | |
2614 | ||
e27f234a | 2615 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2616 | f_err: |
2617 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
556efe79 | 2618 | #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP) |
0f113f3e | 2619 | err: |
ea262260 | 2620 | #endif |
556efe79 | 2621 | #ifndef OPENSSL_NO_EC |
880d9d86 | 2622 | EVP_PKEY_free(ckey); |
20ca916d | 2623 | OPENSSL_free(rsa_decrypt); |
85269210 DSH |
2624 | #endif |
2625 | #ifndef OPENSSL_NO_PSK | |
2626 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2627 | s->s3->tmp.psk = NULL; | |
58964a49 | 2628 | #endif |
fe3a3291 | 2629 | ossl_statem_set_error(s); |
e27f234a | 2630 | return MSG_PROCESS_ERROR; |
0f113f3e | 2631 | } |
d02b48c6 | 2632 | |
be3583fa | 2633 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2634 | { |
94836de2 | 2635 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2636 | if (wst == WORK_MORE_A) { |
2637 | if (SSL_IS_DTLS(s)) { | |
2638 | unsigned char sctpauthkey[64]; | |
2639 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2640 | /* | |
2641 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2642 | * used. | |
2643 | */ | |
141eb8c6 MC |
2644 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2645 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2646 | |
2647 | if (SSL_export_keying_material(s, sctpauthkey, | |
2648 | sizeof(sctpauthkey), labelbuffer, | |
2649 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2650 | ossl_statem_set_error(s); |
c130dd8e MC |
2651 | return WORK_ERROR;; |
2652 | } | |
94836de2 | 2653 | |
c130dd8e MC |
2654 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2655 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2656 | } |
c130dd8e MC |
2657 | wst = WORK_MORE_B; |
2658 | } | |
94836de2 | 2659 | |
c130dd8e MC |
2660 | if ((wst == WORK_MORE_B) |
2661 | /* Is this SCTP? */ | |
2662 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2663 | /* Are we renegotiating? */ | |
2664 | && s->renegotiate | |
2665 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2666 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2667 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2668 | s->s3->in_read_app_data = 2; | |
2669 | s->rwstate = SSL_READING; | |
2670 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2671 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2672 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2673 | return WORK_MORE_B; |
2674 | } else { | |
fe3a3291 | 2675 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2676 | } |
2677 | #endif | |
2678 | ||
a71a4966 | 2679 | if (s->statem.no_cert_verify) { |
94836de2 MC |
2680 | /* No certificate verify so we no longer need the handshake_buffer */ |
2681 | BIO_free(s->s3->handshake_buffer); | |
e44380a9 | 2682 | s->s3->handshake_buffer = NULL; |
94836de2 | 2683 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2684 | } else { |
94836de2 MC |
2685 | if (!s->session->peer) { |
2686 | /* No peer certificate so we no longer need the handshake_buffer */ | |
2687 | BIO_free(s->s3->handshake_buffer); | |
2688 | return WORK_FINISHED_CONTINUE; | |
2689 | } | |
2690 | if (!s->s3->handshake_buffer) { | |
2691 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2692 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2693 | ossl_statem_set_error(s); |
94836de2 MC |
2694 | return WORK_ERROR; |
2695 | } | |
2696 | /* | |
2697 | * For sigalgs freeze the handshake buffer. If we support | |
2698 | * extms we've done this already so this is a no-op | |
2699 | */ | |
2700 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2701 | ossl_statem_set_error(s); |
94836de2 MC |
2702 | return WORK_ERROR; |
2703 | } | |
94836de2 MC |
2704 | } |
2705 | ||
2706 | return WORK_FINISHED_CONTINUE; | |
2707 | } | |
2708 | ||
be3583fa | 2709 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2710 | { |
2711 | EVP_PKEY *pkey = NULL; | |
2712 | unsigned char *sig, *data; | |
2713 | int al, ret = MSG_PROCESS_ERROR; | |
28f4580c | 2714 | int type = 0, j; |
e27f234a MC |
2715 | unsigned int len; |
2716 | X509 *peer; | |
2717 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2718 | long hdatalen = 0; |
2719 | void *hdata; | |
2720 | ||
bfb0641f | 2721 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
6e59a892 RL |
2722 | |
2723 | if (mctx == NULL) { | |
2724 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2725 | al = SSL_AD_INTERNAL_ERROR; | |
2726 | goto f_err; | |
2727 | } | |
e27f234a | 2728 | |
a0bd6493 MC |
2729 | peer = s->session->peer; |
2730 | pkey = X509_get_pubkey(peer); | |
2731 | type = X509_certificate_type(peer, pkey); | |
0f113f3e MC |
2732 | |
2733 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2734 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2735 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2736 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2737 | goto f_err; | |
2738 | } | |
2739 | ||
0f113f3e MC |
2740 | /* Check for broken implementations of GOST ciphersuites */ |
2741 | /* | |
2742 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2743 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2744 | */ |
2a9b9654 | 2745 | #ifndef OPENSSL_NO_GOST |
73999b62 | 2746 | if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) { |
f532a35d | 2747 | len = 64; |
2a9b9654 MC |
2748 | } else |
2749 | #endif | |
2750 | { | |
0f113f3e | 2751 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2752 | int rv; |
2753 | ||
73999b62 | 2754 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2755 | al = SSL_AD_DECODE_ERROR; |
2756 | goto f_err; | |
2757 | } | |
2758 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2759 | if (rv == -1) { |
2760 | al = SSL_AD_INTERNAL_ERROR; | |
2761 | goto f_err; | |
2762 | } else if (rv == 0) { | |
2763 | al = SSL_AD_DECODE_ERROR; | |
2764 | goto f_err; | |
2765 | } | |
f37f20ff | 2766 | #ifdef SSL_DEBUG |
0f113f3e | 2767 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2768 | #endif |
28f4580c | 2769 | } else { |
aa430c74 DSH |
2770 | /* Use default digest for this key type */ |
2771 | int idx = ssl_cert_type(NULL, pkey); | |
2772 | if (idx >= 0) | |
2773 | md = s->s3->tmp.md[idx]; | |
2774 | if (md == NULL) { | |
2775 | al = SSL_AD_INTERNAL_ERROR; | |
2776 | goto f_err; | |
2777 | } | |
0f113f3e | 2778 | } |
aa430c74 | 2779 | |
73999b62 | 2780 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2781 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2782 | al = SSL_AD_DECODE_ERROR; |
2783 | goto f_err; | |
2784 | } | |
2785 | } | |
2786 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
2787 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
2788 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 2789 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2790 | al = SSL_AD_DECODE_ERROR; |
2791 | goto f_err; | |
2792 | } | |
73999b62 | 2793 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2794 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2795 | al = SSL_AD_DECODE_ERROR; |
2796 | goto f_err; | |
2797 | } | |
0f113f3e | 2798 | |
28f4580c DSH |
2799 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2800 | if (hdatalen <= 0) { | |
2801 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2802 | al = SSL_AD_INTERNAL_ERROR; | |
2803 | goto f_err; | |
2804 | } | |
f37f20ff | 2805 | #ifdef SSL_DEBUG |
28f4580c | 2806 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2807 | #endif |
6e59a892 RL |
2808 | if (!EVP_VerifyInit_ex(mctx, md, NULL) |
2809 | || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) { | |
28f4580c DSH |
2810 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
2811 | al = SSL_AD_INTERNAL_ERROR; | |
2812 | goto f_err; | |
2813 | } | |
0f113f3e | 2814 | |
2a9b9654 | 2815 | #ifndef OPENSSL_NO_GOST |
28f4580c DSH |
2816 | if (pkey->type == NID_id_GostR3410_2001 |
2817 | || pkey->type == NID_id_GostR3410_2012_256 | |
2818 | || pkey->type == NID_id_GostR3410_2012_512) { | |
2a9b9654 | 2819 | BUF_reverse(data, NULL, len); |
28f4580c | 2820 | } |
2a9b9654 | 2821 | #endif |
e44380a9 | 2822 | |
28f4580c | 2823 | if (s->version == SSL3_VERSION |
6e59a892 | 2824 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
28f4580c DSH |
2825 | s->session->master_key_length, |
2826 | s->session->master_key)) { | |
2827 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2828 | al = SSL_AD_INTERNAL_ERROR; | |
2829 | goto f_err; | |
2830 | } | |
2831 | ||
6e59a892 | 2832 | if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) { |
28f4580c DSH |
2833 | al = SSL_AD_DECRYPT_ERROR; |
2834 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2835 | goto f_err; |
2836 | } | |
2837 | ||
c130dd8e | 2838 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2839 | if (0) { |
2840 | f_err: | |
2841 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 2842 | ossl_statem_set_error(s); |
0f113f3e | 2843 | } |
25aaa98a RS |
2844 | BIO_free(s->s3->handshake_buffer); |
2845 | s->s3->handshake_buffer = NULL; | |
bfb0641f | 2846 | EVP_MD_CTX_free(mctx); |
0f113f3e | 2847 | EVP_PKEY_free(pkey); |
e27f234a | 2848 | return ret; |
0f113f3e | 2849 | } |
d02b48c6 | 2850 | |
be3583fa | 2851 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 2852 | { |
20dbe585 | 2853 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
2854 | X509 *x = NULL; |
2855 | unsigned long l, llen; | |
2856 | const unsigned char *certstart; | |
2857 | unsigned char *certbytes; | |
2858 | STACK_OF(X509) *sk = NULL; | |
73999b62 | 2859 | PACKET spkt; |
0f113f3e MC |
2860 | |
2861 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
2862 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2863 | goto f_err; | |
0f113f3e MC |
2864 | } |
2865 | ||
73999b62 MC |
2866 | if (!PACKET_get_net_3(pkt, &llen) |
2867 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
2868 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 2869 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2870 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2871 | goto f_err; |
2872 | } | |
0bc09ecd MC |
2873 | |
2874 | while (PACKET_remaining(&spkt) > 0) { | |
2875 | if (!PACKET_get_net_3(&spkt, &l) | |
2876 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 2877 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2878 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2879 | SSL_R_CERT_LENGTH_MISMATCH); |
2880 | goto f_err; | |
2881 | } | |
2882 | ||
0bc09ecd MC |
2883 | certstart = certbytes; |
2884 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 2885 | if (x == NULL) { |
e27f234a MC |
2886 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
2887 | goto f_err; | |
0f113f3e | 2888 | } |
0bc09ecd | 2889 | if (certbytes != (certstart + l)) { |
0f113f3e | 2890 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2891 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2892 | SSL_R_CERT_LENGTH_MISMATCH); |
2893 | goto f_err; | |
2894 | } | |
2895 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
2896 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2897 | goto f_err; | |
0f113f3e MC |
2898 | } |
2899 | x = NULL; | |
0f113f3e MC |
2900 | } |
2901 | ||
2902 | if (sk_X509_num(sk) <= 0) { | |
2903 | /* TLS does not mind 0 certs returned */ | |
2904 | if (s->version == SSL3_VERSION) { | |
2905 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2906 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2907 | SSL_R_NO_CERTIFICATES_RETURNED); |
2908 | goto f_err; | |
2909 | } | |
2910 | /* Fail for TLS only if we required a certificate */ | |
2911 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
2912 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 2913 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2914 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
2915 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2916 | goto f_err; | |
2917 | } | |
2918 | /* No client certificate so digest cached records */ | |
124037fd | 2919 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
2920 | goto f_err; |
2921 | } | |
2922 | } else { | |
2923 | EVP_PKEY *pkey; | |
2924 | i = ssl_verify_cert_chain(s, sk); | |
2925 | if (i <= 0) { | |
2926 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 2927 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2928 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
2929 | goto f_err; | |
2930 | } | |
2931 | if (i > 1) { | |
e27f234a | 2932 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
2933 | al = SSL_AD_HANDSHAKE_FAILURE; |
2934 | goto f_err; | |
2935 | } | |
2936 | pkey = X509_get_pubkey(sk_X509_value(sk, 0)); | |
2937 | if (pkey == NULL) { | |
2938 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2939 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2940 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
2941 | goto f_err; | |
2942 | } | |
2943 | EVP_PKEY_free(pkey); | |
2944 | } | |
2945 | ||
222561fe | 2946 | X509_free(s->session->peer); |
0f113f3e MC |
2947 | s->session->peer = sk_X509_shift(sk); |
2948 | s->session->verify_result = s->verify_result; | |
2949 | ||
c34b0f99 DSH |
2950 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
2951 | s->session->peer_chain = sk; | |
0f113f3e MC |
2952 | /* |
2953 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
2954 | * certificate, while we do include it in s3_clnt.c | |
2955 | */ | |
0f113f3e | 2956 | sk = NULL; |
e27f234a | 2957 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
2958 | goto done; |
2959 | ||
0f113f3e | 2960 | f_err: |
66696478 | 2961 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 2962 | ossl_statem_set_error(s); |
66696478 | 2963 | done: |
222561fe RS |
2964 | X509_free(x); |
2965 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 2966 | return ret; |
0f113f3e | 2967 | } |
d02b48c6 | 2968 | |
e27f234a MC |
2969 | int tls_construct_server_certificate(SSL *s) |
2970 | { | |
2971 | CERT_PKEY *cpk; | |
2972 | ||
2973 | cpk = ssl_get_server_send_pkey(s); | |
2974 | if (cpk == NULL) { | |
2975 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2976 | ossl_statem_set_error(s); |
e27f234a MC |
2977 | return 0; |
2978 | } | |
2979 | ||
2980 | if (!ssl3_output_cert_chain(s, cpk)) { | |
2981 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2982 | ossl_statem_set_error(s); |
e27f234a MC |
2983 | return 0; |
2984 | } | |
2985 | ||
2986 | return 1; | |
2987 | } | |
2988 | ||
e27f234a MC |
2989 | int tls_construct_new_session_ticket(SSL *s) |
2990 | { | |
2991 | unsigned char *senc = NULL; | |
2992 | EVP_CIPHER_CTX ctx; | |
bf7c6817 | 2993 | HMAC_CTX *hctx = NULL; |
e27f234a MC |
2994 | unsigned char *p, *macstart; |
2995 | const unsigned char *const_p; | |
2996 | int len, slen_full, slen; | |
2997 | SSL_SESSION *sess; | |
2998 | unsigned int hlen; | |
2999 | SSL_CTX *tctx = s->initial_ctx; | |
3000 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
3001 | unsigned char key_name[16]; | |
3002 | ||
3003 | /* get session encoding length */ | |
3004 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
3005 | /* | |
3006 | * Some length values are 16 bits, so forget it if session is too | |
3007 | * long | |
3008 | */ | |
3009 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 3010 | ossl_statem_set_error(s); |
e27f234a MC |
3011 | return 0; |
3012 | } | |
3013 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 3014 | if (senc == NULL) { |
fe3a3291 | 3015 | ossl_statem_set_error(s); |
e27f234a MC |
3016 | return 0; |
3017 | } | |
0f113f3e | 3018 | |
e27f234a | 3019 | EVP_CIPHER_CTX_init(&ctx); |
bf7c6817 | 3020 | hctx = HMAC_CTX_new(); |
0f113f3e | 3021 | |
e27f234a MC |
3022 | p = senc; |
3023 | if (!i2d_SSL_SESSION(s->session, &p)) | |
3024 | goto err; | |
687eaf27 | 3025 | |
e27f234a MC |
3026 | /* |
3027 | * create a fresh copy (not shared with other threads) to clean up | |
3028 | */ | |
3029 | const_p = senc; | |
3030 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3031 | if (sess == NULL) | |
3032 | goto err; | |
3033 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3034 | |
e27f234a MC |
3035 | slen = i2d_SSL_SESSION(sess, NULL); |
3036 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3037 | SSL_SESSION_free(sess); | |
3038 | goto err; | |
3039 | } | |
3040 | p = senc; | |
3041 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3042 | SSL_SESSION_free(sess); | |
3043 | goto err; | |
3044 | } | |
3045 | SSL_SESSION_free(sess); | |
0f113f3e | 3046 | |
e27f234a MC |
3047 | /*- |
3048 | * Grow buffer if need be: the length calculation is as | |
3049 | * follows handshake_header_length + | |
3050 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
3051 | * 16 (key name) + max_iv_len (iv length) + | |
3052 | * session_length + max_enc_block_size (max encrypted session | |
3053 | * length) + max_md_size (HMAC). | |
3054 | */ | |
3055 | if (!BUF_MEM_grow(s->init_buf, | |
3056 | SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + | |
3057 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
3058 | goto err; | |
0f113f3e | 3059 | |
e27f234a MC |
3060 | p = ssl_handshake_start(s); |
3061 | /* | |
3062 | * Initialize HMAC and cipher contexts. If callback present it does | |
3063 | * all the work otherwise use generated values from parent ctx. | |
3064 | */ | |
3065 | if (tctx->tlsext_ticket_key_cb) { | |
bf7c6817 | 3066 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, hctx, 1) < 0) |
e27f234a MC |
3067 | goto err; |
3068 | } else { | |
3069 | if (RAND_bytes(iv, 16) <= 0) | |
687eaf27 | 3070 | goto err; |
e27f234a MC |
3071 | if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, |
3072 | tctx->tlsext_tick_aes_key, iv)) | |
687eaf27 | 3073 | goto err; |
bf7c6817 | 3074 | if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, 16, |
e27f234a | 3075 | EVP_sha256(), NULL)) |
4f9fab6b | 3076 | goto err; |
e27f234a | 3077 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
0f113f3e MC |
3078 | } |
3079 | ||
e27f234a MC |
3080 | /* |
3081 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3082 | * for resumed session (for simplicity), and guess that tickets for | |
3083 | * new sessions will live as long as their sessions. | |
3084 | */ | |
3085 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3086 | ||
3087 | /* Skip ticket length for now */ | |
3088 | p += 2; | |
3089 | /* Output key name */ | |
3090 | macstart = p; | |
3091 | memcpy(p, key_name, 16); | |
3092 | p += 16; | |
3093 | /* output IV */ | |
3094 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); | |
3095 | p += EVP_CIPHER_CTX_iv_length(&ctx); | |
3096 | /* Encrypt session data */ | |
3097 | if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen)) | |
3098 | goto err; | |
3099 | p += len; | |
3100 | if (!EVP_EncryptFinal(&ctx, p, &len)) | |
3101 | goto err; | |
3102 | p += len; | |
3103 | ||
bf7c6817 | 3104 | if (!HMAC_Update(hctx, macstart, p - macstart)) |
e27f234a | 3105 | goto err; |
bf7c6817 | 3106 | if (!HMAC_Final(hctx, p, &hlen)) |
e27f234a MC |
3107 | goto err; |
3108 | ||
3109 | EVP_CIPHER_CTX_cleanup(&ctx); | |
bf7c6817 | 3110 | HMAC_CTX_free(hctx); |
e27f234a MC |
3111 | |
3112 | p += hlen; | |
3113 | /* Now write out lengths: p points to end of data written */ | |
3114 | /* Total length */ | |
3115 | len = p - ssl_handshake_start(s); | |
3116 | /* Skip ticket lifetime hint */ | |
3117 | p = ssl_handshake_start(s) + 4; | |
3118 | s2n(len - 6, p); | |
3119 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3120 | goto err; | |
3121 | OPENSSL_free(senc); | |
3122 | ||
3123 | return 1; | |
687eaf27 | 3124 | err: |
b548a1f1 | 3125 | OPENSSL_free(senc); |
687eaf27 | 3126 | EVP_CIPHER_CTX_cleanup(&ctx); |
bf7c6817 | 3127 | HMAC_CTX_free(hctx); |
fe3a3291 | 3128 | ossl_statem_set_error(s); |
e27f234a | 3129 | return 0; |
0f113f3e | 3130 | } |
67c8e7f4 | 3131 | |
e27f234a MC |
3132 | int tls_construct_cert_status(SSL *s) |
3133 | { | |
3134 | unsigned char *p; | |
3135 | /*- | |
3136 | * Grow buffer if need be: the length calculation is as | |
3137 | * follows 1 (message type) + 3 (message length) + | |
3138 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3139 | * + (ocsp response) | |
3140 | */ | |
3141 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3142 | ossl_statem_set_error(s); |
e27f234a MC |
3143 | return 0; |
3144 | } | |
3145 | ||
3146 | p = (unsigned char *)s->init_buf->data; | |
3147 | ||
3148 | /* do the header */ | |
3149 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3150 | /* message length */ | |
3151 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3152 | /* status type */ | |
3153 | *(p++) = s->tlsext_status_type; | |
3154 | /* length of OCSP response */ | |
3155 | l2n3(s->tlsext_ocsp_resplen, p); | |
3156 | /* actual response */ | |
3157 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3158 | /* number of bytes to write */ | |
3159 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3160 | s->init_off = 0; | |
3161 | ||
3162 | return 1; | |
3163 | } | |
3164 | ||
e481f9b9 | 3165 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3166 | /* |
3167 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3168 | * It sets the next_proto member in s if found | |
3169 | */ | |
be3583fa | 3170 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3171 | { |
73999b62 | 3172 | PACKET next_proto, padding; |
e27f234a MC |
3173 | size_t next_proto_len; |
3174 | ||
50e735f9 MC |
3175 | /*- |
3176 | * The payload looks like: | |
3177 | * uint8 proto_len; | |
3178 | * uint8 proto[proto_len]; | |
3179 | * uint8 padding_len; | |
3180 | * uint8 padding[padding_len]; | |
3181 | */ | |
73999b62 MC |
3182 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3183 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3184 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3185 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3186 | goto err; |
cf9b0b6f | 3187 | } |
0f113f3e | 3188 | |
6d41fc80 EK |
3189 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3190 | &next_proto_len)) { | |
3191 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3192 | goto err; |
3193 | } | |
3194 | ||
6d41fc80 | 3195 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3196 | |
e27f234a | 3197 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3198 | err: |
fe3a3291 | 3199 | ossl_statem_set_error(s); |
e27f234a | 3200 | return MSG_PROCESS_ERROR; |
0f113f3e | 3201 | } |
6434abbf | 3202 | #endif |
d45ba43d MC |
3203 | |
3204 | #define SSLV2_CIPHER_LEN 3 | |
3205 | ||
38a3cbfb EK |
3206 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3207 | PACKET *cipher_suites, | |
d45ba43d | 3208 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3209 | int sslv2format, int *al |
3210 | ) | |
d45ba43d MC |
3211 | { |
3212 | const SSL_CIPHER *c; | |
3213 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3214 | int n; |
3215 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3216 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3217 | |
38a3cbfb EK |
3218 | s->s3->send_connection_binding = 0; |
3219 | ||
3220 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3221 | ||
3222 | if (PACKET_remaining(cipher_suites) == 0) { | |
3223 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3224 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3225 | return NULL; | |
d45ba43d | 3226 | } |
38a3cbfb EK |
3227 | |
3228 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3229 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3230 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3231 | *al = SSL_AD_DECODE_ERROR; |
3232 | return NULL; | |
d45ba43d | 3233 | } |
38a3cbfb | 3234 | |
d45ba43d MC |
3235 | if ((skp == NULL) || (*skp == NULL)) { |
3236 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3237 | if(sk == NULL) { | |
3238 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3239 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3240 | return NULL; |
3241 | } | |
3242 | } else { | |
3243 | sk = *skp; | |
3244 | sk_SSL_CIPHER_zero(sk); | |
3245 | } | |
3246 | ||
38a3cbfb EK |
3247 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3248 | &s->s3->tmp.ciphers_rawlen)) { | |
3249 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3250 | goto err; |
3251 | } | |
d45ba43d | 3252 | |
38a3cbfb EK |
3253 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3254 | /* | |
20218b58 EK |
3255 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3256 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3257 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3258 | */ |
3259 | if (sslv2format && cipher[0] != '\0') | |
3260 | continue; | |
3261 | ||
d45ba43d | 3262 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3263 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3264 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3265 | /* SCSV fatal if renegotiating */ |
3266 | if (s->renegotiate) { | |
3267 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3268 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3269 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3270 | goto err; |
3271 | } | |
3272 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3273 | #ifdef OPENSSL_RI_DEBUG |
3274 | fprintf(stderr, "SCSV received by server\n"); | |
3275 | #endif | |
3276 | continue; | |
3277 | } | |
3278 | ||
3279 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3280 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3281 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3282 | /* |
3283 | * The SCSV indicates that the client previously tried a higher | |
3284 | * version. Fail if the current version is an unexpected | |
3285 | * downgrade. | |
3286 | */ | |
3287 | if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) { | |
3288 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3289 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3290 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3291 | goto err; |
3292 | } | |
d45ba43d MC |
3293 | continue; |
3294 | } | |
3295 | ||
38a3cbfb EK |
3296 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3297 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3298 | if (c != NULL) { |
3299 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3300 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3301 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3302 | goto err; |
3303 | } | |
3304 | } | |
3305 | } | |
38a3cbfb EK |
3306 | if (PACKET_remaining(cipher_suites) > 0) { |
3307 | *al = SSL_AD_INTERNAL_ERROR; | |
3308 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3309 | goto err; | |
3310 | } | |
d45ba43d MC |
3311 | |
3312 | if (skp != NULL) | |
3313 | *skp = sk; | |
3314 | return (sk); | |
3315 | err: | |
3316 | if ((skp == NULL) || (*skp == NULL)) | |
3317 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3318 | return NULL; |
d45ba43d | 3319 | } |