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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; | |
4a640fb6 | 968 | const SSL_CIPHER *c; |
e27f234a MC |
969 | #ifndef OPENSSL_NO_COMP |
970 | SSL_COMP *comp = NULL; | |
971 | #endif | |
972 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
4fa52141 | 973 | int protverr; |
e27f234a | 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 | ||
4fa52141 VD |
1040 | /* |
1041 | * Do SSL/TLS version negotiation if applicable. For DTLS we just check | |
1042 | * versions are potentially compatible. Version negotiation comes later. | |
1043 | */ | |
32ec4153 | 1044 | if (!SSL_IS_DTLS(s)) { |
4fa52141 VD |
1045 | protverr = ssl_choose_server_version(s); |
1046 | } else if (s->method->version != DTLS_ANY_VERSION && | |
1047 | DTLS_VERSION_LT(s->client_version, s->version)) { | |
1048 | protverr = SSL_R_VERSION_TOO_LOW; | |
1049 | } else { | |
32ec4153 MC |
1050 | protverr = 0; |
1051 | } | |
1052 | ||
1053 | if (protverr) { | |
4fa52141 | 1054 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); |
32ec4153 | 1055 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
1056 | /* |
1057 | * similar to ssl3_get_record, send alert using remote version | |
1058 | * number | |
1059 | */ | |
1060 | s->version = s->client_version; | |
1061 | } | |
1062 | al = SSL_AD_PROTOCOL_VERSION; | |
1063 | goto f_err; | |
1064 | } | |
1065 | ||
b3e2272c EK |
1066 | /* Parse the message and load client random. */ |
1067 | if (is_v2_record) { | |
32ec4153 MC |
1068 | /* |
1069 | * Handle an SSLv2 backwards compatible ClientHello | |
1070 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1071 | * Real SSLv2 is not supported, and is rejected above. | |
1072 | */ | |
ec30e856 | 1073 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1074 | PACKET challenge; |
0f113f3e | 1075 | |
73999b62 MC |
1076 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1077 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1078 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1079 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1080 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1081 | al = SSL_AD_DECODE_ERROR; |
1082 | goto f_err; | |
5e9f0eeb | 1083 | } |
0f113f3e | 1084 | |
73999b62 MC |
1085 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1086 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1087 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1088 | /* No extensions. */ |
73999b62 | 1089 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1090 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1091 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1092 | al = SSL_AD_DECODE_ERROR; |
1093 | goto f_err; | |
1094 | } | |
1095 | ||
32ec4153 | 1096 | /* Load the client random */ |
b3e2272c EK |
1097 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1098 | challenge_len; | |
32ec4153 | 1099 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1100 | if (!PACKET_copy_bytes(&challenge, |
1101 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
1102 | challenge_len, challenge_len)) { | |
f0659bdb | 1103 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1104 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1105 | goto f_err; |
1106 | } | |
b3e2272c EK |
1107 | |
1108 | PACKET_null_init(&compression); | |
1109 | PACKET_null_init(&extensions); | |
0f113f3e | 1110 | } else { |
b3e2272c | 1111 | /* Regular ClientHello. */ |
73999b62 MC |
1112 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1113 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1114 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1115 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1116 | goto f_err; |
1117 | } | |
32ec4153 | 1118 | |
b3e2272c | 1119 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1120 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1121 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1122 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1123 | goto f_err; |
1124 | } | |
b3e2272c EK |
1125 | /* |
1126 | * If we require cookies and this ClientHello doesn't contain one, | |
1127 | * just return since we do not want to allocate any memory yet. | |
1128 | * So check cookie length... | |
1129 | */ | |
1130 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1131 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1132 | return 1; |
b3e2272c | 1133 | } |
5e9f0eeb | 1134 | } |
0f113f3e | 1135 | |
73999b62 MC |
1136 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1137 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c | 1138 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1139 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
b3e2272c EK |
1140 | goto f_err; |
1141 | } | |
1142 | /* Could be empty. */ | |
73999b62 | 1143 | extensions = *pkt; |
b3e2272c EK |
1144 | } |
1145 | ||
1146 | s->hit = 0; | |
1147 | ||
1148 | /* | |
1149 | * We don't allow resumption in a backwards compatible ClientHello. | |
1150 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1151 | * | |
1152 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1153 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1154 | * ignore resumption requests with flag | |
1155 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1156 | * than a change to default behavior so that applications relying on | |
1157 | * this for security won't even compile against older library versions). | |
1158 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1159 | * request renegotiation but not a new session (s->new_session remains | |
1160 | * unset): for servers, this essentially just means that the | |
1161 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1162 | * ignored. | |
1163 | */ | |
1164 | if (is_v2_record || | |
1165 | (s->new_session && | |
1166 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1167 | if (!ssl_get_new_session(s, 1)) | |
1168 | goto err; | |
1169 | } else { | |
1170 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1171 | /* |
b3e2272c EK |
1172 | * Only resume if the session's version matches the negotiated |
1173 | * version. | |
1174 | * RFC 5246 does not provide much useful advice on resumption | |
1175 | * with a different protocol version. It doesn't forbid it but | |
1176 | * the sanity of such behaviour would be questionable. | |
1177 | * In practice, clients do not accept a version mismatch and | |
1178 | * will abort the handshake with an error. | |
0f113f3e | 1179 | */ |
b3e2272c EK |
1180 | if (i == 1 && s->version == s->session->ssl_version) { |
1181 | /* previous session */ | |
1182 | s->hit = 1; | |
1183 | } else if (i == -1) { | |
1184 | goto err; | |
32ec4153 | 1185 | } else { |
b3e2272c EK |
1186 | /* i == 0 */ |
1187 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1188 | goto err; |
0f113f3e | 1189 | } |
b3e2272c | 1190 | } |
0f113f3e | 1191 | |
b3e2272c | 1192 | if (SSL_IS_DTLS(s)) { |
e27f234a | 1193 | /* Empty cookie was already handled above by returning early. */ |
31011544 | 1194 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { |
b3e2272c | 1195 | if (s->ctx->app_verify_cookie_cb != NULL) { |
31011544 EK |
1196 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), |
1197 | PACKET_remaining(&cookie)) == 0) { | |
32ec4153 | 1198 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1199 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1200 | SSL_R_COOKIE_MISMATCH); |
32ec4153 | 1201 | goto f_err; |
31011544 | 1202 | /* else cookie verification succeeded */ |
32ec4153 | 1203 | } |
b3e2272c | 1204 | /* default verification */ |
31011544 EK |
1205 | } else if (!PACKET_equal(&cookie, s->d1->cookie, |
1206 | s->d1->cookie_len)) { | |
b3e2272c | 1207 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1208 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); |
b3e2272c | 1209 | goto f_err; |
32ec4153 | 1210 | } |
e27f234a | 1211 | s->d1->cookie_verified = 1; |
0f113f3e | 1212 | } |
b3e2272c | 1213 | if (s->method->version == DTLS_ANY_VERSION) { |
4fa52141 VD |
1214 | protverr = ssl_choose_server_version(s); |
1215 | if (protverr != 0) { | |
1216 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
b3e2272c EK |
1217 | s->version = s->client_version; |
1218 | al = SSL_AD_PROTOCOL_VERSION; | |
1219 | goto f_err; | |
1220 | } | |
1221 | s->session->ssl_version = s->version; | |
32ec4153 | 1222 | } |
b3e2272c | 1223 | } |
3ae91cfb | 1224 | |
38a3cbfb EK |
1225 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1226 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1227 | goto f_err; |
1228 | } | |
5e9f0eeb | 1229 | |
b3e2272c EK |
1230 | /* If it is a hit, check that the cipher is in the list */ |
1231 | if (s->hit) { | |
1232 | j = 0; | |
1233 | id = s->session->cipher->id; | |
d02b48c6 | 1234 | |
413c4f45 | 1235 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1236 | fprintf(stderr, "client sent %d ciphers\n", |
1237 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1238 | #endif |
b3e2272c EK |
1239 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1240 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1241 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1242 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1243 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1244 | #endif |
b3e2272c EK |
1245 | if (c->id == id) { |
1246 | j = 1; | |
1247 | break; | |
32ec4153 | 1248 | } |
0f113f3e | 1249 | } |
b3e2272c | 1250 | if (j == 0) { |
ec30e856 | 1251 | /* |
b3e2272c EK |
1252 | * we need to have the cipher in the cipher list if we are asked |
1253 | * to reuse it | |
ec30e856 | 1254 | */ |
b3e2272c | 1255 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1256 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1257 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1258 | goto f_err; |
1259 | } | |
b3e2272c | 1260 | } |
9ceb2426 | 1261 | |
b3e2272c EK |
1262 | complen = PACKET_remaining(&compression); |
1263 | for (j = 0; j < complen; j++) { | |
1264 | if (PACKET_data(&compression)[j] == 0) | |
1265 | break; | |
0f113f3e | 1266 | } |
32ec4153 | 1267 | |
b3e2272c EK |
1268 | if (j >= complen) { |
1269 | /* no compress */ | |
1270 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1271 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1272 | goto f_err; |
1273 | } | |
1274 | ||
0f113f3e MC |
1275 | /* TLS extensions */ |
1276 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1277 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
f0659bdb | 1278 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
0f113f3e MC |
1279 | goto err; |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Check if we want to use external pre-shared secret for this handshake | |
1285 | * for not reused session only. We need to generate server_random before | |
1286 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1287 | * processing to use it in key derivation. | |
1288 | */ | |
1289 | { | |
1290 | unsigned char *pos; | |
1291 | pos = s->s3->server_random; | |
1292 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1293 | goto f_err; | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
4a640fb6 | 1298 | const SSL_CIPHER *pref_cipher = NULL; |
0f113f3e MC |
1299 | |
1300 | s->session->master_key_length = sizeof(s->session->master_key); | |
1301 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1302 | &s->session->master_key_length, ciphers, | |
1303 | &pref_cipher, | |
1304 | s->tls_session_secret_cb_arg)) { | |
1305 | s->hit = 1; | |
1306 | s->session->ciphers = ciphers; | |
1307 | s->session->verify_result = X509_V_OK; | |
1308 | ||
1309 | ciphers = NULL; | |
1310 | ||
1311 | /* check if some cipher was preferred by call back */ | |
1312 | pref_cipher = | |
1313 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1314 | s-> | |
1315 | session->ciphers, | |
1316 | SSL_get_ciphers | |
1317 | (s)); | |
1318 | if (pref_cipher == NULL) { | |
1319 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1320 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1321 | goto f_err; |
1322 | } | |
1323 | ||
1324 | s->session->cipher = pref_cipher; | |
25aaa98a | 1325 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1326 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1327 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1328 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1329 | } | |
1330 | } | |
58ece833 | 1331 | |
0f113f3e MC |
1332 | /* |
1333 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1334 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1335 | * algorithms from the client, starting at q. |
1336 | */ | |
1337 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1338 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1339 | /* This only happens if we have a cache hit */ |
1340 | if (s->session->compress_meth != 0) { | |
1341 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1342 | unsigned int k; |
0f113f3e MC |
1343 | /* Perform sanity checks on resumed compression algorithm */ |
1344 | /* Can't disable compression */ | |
1345 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1346 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1347 | SSL_R_INCONSISTENT_COMPRESSION); |
1348 | goto f_err; | |
1349 | } | |
1350 | /* Look for resumed compression method */ | |
1351 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1352 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1353 | if (comp_id == comp->id) { | |
1354 | s->s3->tmp.new_compression = comp; | |
1355 | break; | |
1356 | } | |
1357 | } | |
1358 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1359 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1360 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1361 | goto f_err; | |
1362 | } | |
1363 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1364 | for (k = 0; k < complen; k++) { |
ec30e856 | 1365 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1366 | break; |
1367 | } | |
9ceb2426 | 1368 | if (k >= complen) { |
0f113f3e | 1369 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1370 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1371 | SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING); |
1372 | goto f_err; | |
1373 | } | |
1374 | } else if (s->hit) | |
1375 | comp = NULL; | |
1376 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1377 | /* See if we have a match */ |
9ceb2426 MC |
1378 | int m, nn, v, done = 0; |
1379 | unsigned int o; | |
0f113f3e MC |
1380 | |
1381 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1382 | for (m = 0; m < nn; m++) { | |
1383 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1384 | v = comp->id; | |
b2ce0337 | 1385 | for (o = 0; o < complen; o++) { |
ec30e856 | 1386 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1387 | done = 1; |
1388 | break; | |
1389 | } | |
1390 | } | |
1391 | if (done) | |
1392 | break; | |
1393 | } | |
1394 | if (done) | |
1395 | s->s3->tmp.new_compression = comp; | |
1396 | else | |
1397 | comp = NULL; | |
1398 | } | |
e6f418bc | 1399 | #else |
0f113f3e MC |
1400 | /* |
1401 | * If compression is disabled we'd better not try to resume a session | |
1402 | * using compression. | |
1403 | */ | |
1404 | if (s->session->compress_meth != 0) { | |
e27f234a | 1405 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1406 | goto f_err; |
1407 | } | |
09b6c2ef | 1408 | #endif |
413c4f45 | 1409 | |
0f113f3e MC |
1410 | /* |
1411 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1412 | */ | |
d02b48c6 | 1413 | |
0f113f3e | 1414 | if (!s->hit) { |
09b6c2ef | 1415 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1416 | s->session->compress_meth = 0; |
09b6c2ef | 1417 | #else |
0f113f3e | 1418 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1419 | #endif |
25aaa98a | 1420 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1421 | s->session->ciphers = ciphers; |
1422 | if (ciphers == NULL) { | |
3ae91cfb | 1423 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1424 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1425 | goto f_err; |
1426 | } | |
1427 | ciphers = NULL; | |
1428 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1429 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1430 | goto err; |
1431 | } | |
e27f234a MC |
1432 | } |
1433 | ||
1434 | sk_SSL_CIPHER_free(ciphers); | |
1435 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1436 | f_err: | |
1437 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1438 | err: | |
fe3a3291 | 1439 | ossl_statem_set_error(s); |
e27f234a MC |
1440 | |
1441 | sk_SSL_CIPHER_free(ciphers); | |
1442 | return MSG_PROCESS_ERROR; | |
1443 | ||
1444 | } | |
1445 | ||
be3583fa | 1446 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1447 | { |
d13dd4be | 1448 | int al = SSL_AD_HANDSHAKE_FAILURE; |
4a640fb6 | 1449 | const SSL_CIPHER *cipher; |
e27f234a MC |
1450 | |
1451 | if (wst == WORK_MORE_A) { | |
1452 | if (!s->hit) { | |
1453 | /* Let cert callback update server certificates if required */ | |
1454 | if (s->cert->cert_cb) { | |
1455 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1456 | if (rv == 0) { | |
1457 | al = SSL_AD_INTERNAL_ERROR; | |
1458 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1459 | goto f_err; | |
1460 | } | |
1461 | if (rv < 0) { | |
1462 | s->rwstate = SSL_X509_LOOKUP; | |
1463 | return WORK_MORE_A; | |
1464 | } | |
1465 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1466 | } |
e27f234a MC |
1467 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1468 | ||
1469 | if (cipher == NULL) { | |
e27f234a MC |
1470 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
1471 | goto f_err; | |
0f113f3e | 1472 | } |
e27f234a MC |
1473 | s->s3->tmp.new_cipher = cipher; |
1474 | /* check whether we should disable session resumption */ | |
1475 | if (s->not_resumable_session_cb != NULL) | |
1476 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1477 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1478 | if (s->session->not_resumable) | |
1479 | /* do not send a session ticket */ | |
1480 | s->tlsext_ticket_expected = 0; | |
1481 | } else { | |
1482 | /* Session-id reuse */ | |
1483 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1484 | } |
0f113f3e | 1485 | |
28f4580c | 1486 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1487 | if (!ssl3_digest_cached_records(s, 0)) { |
1488 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1489 | goto f_err; |
d13dd4be | 1490 | } |
0f113f3e | 1491 | } |
0f113f3e | 1492 | |
e27f234a MC |
1493 | /*- |
1494 | * we now have the following setup. | |
1495 | * client_random | |
1496 | * cipher_list - our prefered list of ciphers | |
1497 | * ciphers - the clients prefered list of ciphers | |
1498 | * compression - basically ignored right now | |
1499 | * ssl version is set - sslv3 | |
1500 | * s->session - The ssl session has been setup. | |
1501 | * s->hit - session reuse flag | |
1502 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1503 | */ | |
0f113f3e | 1504 | |
e27f234a MC |
1505 | /* Handles TLS extensions that we couldn't check earlier */ |
1506 | if (s->version >= SSL3_VERSION) { | |
1507 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
d13dd4be MC |
1508 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1509 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1510 | goto f_err; |
1511 | } | |
1512 | } | |
0f113f3e | 1513 | |
e27f234a MC |
1514 | wst = WORK_MORE_B; |
1515 | } | |
1516 | #ifndef OPENSSL_NO_SRP | |
1517 | if (wst == WORK_MORE_B) { | |
1518 | int ret; | |
1519 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1520 | /* | |
1521 | * callback indicates further work to be done | |
1522 | */ | |
1523 | s->rwstate = SSL_X509_LOOKUP; | |
1524 | return WORK_MORE_B; | |
1525 | } | |
1526 | if (ret != SSL_ERROR_NONE) { | |
1527 | /* | |
1528 | * This is not really an error but the only means to for | |
1529 | * a client to detect whether srp is supported. | |
1530 | */ | |
1531 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1532 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1533 | SSL_R_CLIENTHELLO_TLSEXT); | |
1534 | goto f_err; | |
0f113f3e MC |
1535 | } |
1536 | } | |
e27f234a MC |
1537 | #endif |
1538 | s->renegotiate = 2; | |
0f113f3e | 1539 | |
e27f234a | 1540 | return WORK_FINISHED_STOP; |
0f113f3e | 1541 | f_err: |
e27f234a | 1542 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1543 | ossl_statem_set_error(s); |
e27f234a MC |
1544 | return WORK_ERROR; |
1545 | } | |
1546 | ||
e27f234a | 1547 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1548 | { |
1549 | unsigned char *buf; | |
1550 | unsigned char *p, *d; | |
1551 | int i, sl; | |
1552 | int al = 0; | |
1553 | unsigned long l; | |
1554 | ||
e27f234a | 1555 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1556 | |
e27f234a MC |
1557 | /* Do the message type and length last */ |
1558 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1559 | |
e27f234a MC |
1560 | *(p++) = s->version >> 8; |
1561 | *(p++) = s->version & 0xff; | |
0f113f3e | 1562 | |
e27f234a MC |
1563 | /* |
1564 | * Random stuff. Filling of the server_random takes place in | |
1565 | * tls_process_client_hello() | |
1566 | */ | |
1567 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1568 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1569 | |
e27f234a MC |
1570 | /*- |
1571 | * There are several cases for the session ID to send | |
1572 | * back in the server hello: | |
1573 | * - For session reuse from the session cache, | |
1574 | * we send back the old session ID. | |
1575 | * - If stateless session reuse (using a session ticket) | |
1576 | * is successful, we send back the client's "session ID" | |
1577 | * (which doesn't actually identify the session). | |
1578 | * - If it is a new session, we send back the new | |
1579 | * session ID. | |
1580 | * - However, if we want the new session to be single-use, | |
1581 | * we send back a 0-length session ID. | |
1582 | * s->hit is non-zero in either case of session reuse, | |
1583 | * so the following won't overwrite an ID that we're supposed | |
1584 | * to send back. | |
1585 | */ | |
1586 | if (s->session->not_resumable || | |
1587 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1588 | && !s->hit)) | |
1589 | s->session->session_id_length = 0; | |
1590 | ||
1591 | sl = s->session->session_id_length; | |
1592 | if (sl > (int)sizeof(s->session->session_id)) { | |
1593 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1594 | ossl_statem_set_error(s); |
e27f234a MC |
1595 | return 0; |
1596 | } | |
1597 | *(p++) = sl; | |
1598 | memcpy(p, s->session->session_id, sl); | |
1599 | p += sl; | |
0f113f3e | 1600 | |
e27f234a MC |
1601 | /* put the cipher */ |
1602 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1603 | p += i; | |
0f113f3e | 1604 | |
e27f234a | 1605 | /* put the compression method */ |
09b6c2ef | 1606 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1607 | *(p++) = 0; |
09b6c2ef | 1608 | #else |
e27f234a MC |
1609 | if (s->s3->tmp.new_compression == NULL) |
1610 | *(p++) = 0; | |
1611 | else | |
1612 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1613 | #endif |
e481f9b9 | 1614 | |
e27f234a MC |
1615 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1616 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1617 | ossl_statem_set_error(s); |
e27f234a MC |
1618 | return 0; |
1619 | } | |
1620 | if ((p = | |
1621 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1622 | &al)) == NULL) { | |
1623 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1624 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1625 | ossl_statem_set_error(s); |
e27f234a MC |
1626 | return 0; |
1627 | } | |
e481f9b9 | 1628 | |
e27f234a MC |
1629 | /* do the header */ |
1630 | l = (p - d); | |
1631 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1632 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1633 | ossl_statem_set_error(s); |
e27f234a | 1634 | return 0; |
0f113f3e | 1635 | } |
d02b48c6 | 1636 | |
e27f234a | 1637 | return 1; |
0f113f3e | 1638 | } |
d02b48c6 | 1639 | |
e27f234a MC |
1640 | int tls_construct_server_done(SSL *s) |
1641 | { | |
1642 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1643 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1644 | ossl_statem_set_error(s); |
e27f234a MC |
1645 | return 0; |
1646 | } | |
1647 | ||
1648 | if (!s->s3->tmp.cert_request) { | |
1649 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1650 | ossl_statem_set_error(s); |
e27f234a MC |
1651 | } |
1652 | } | |
1653 | ||
1654 | return 1; | |
1655 | } | |
1656 | ||
e27f234a | 1657 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1658 | { |
bc36ee62 | 1659 | #ifndef OPENSSL_NO_DH |
e2b420fd | 1660 | EVP_PKEY *pkdh = NULL; |
ea262260 | 1661 | #endif |
10bf4fc2 | 1662 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1663 | unsigned char *encodedPoint = NULL; |
1664 | int encodedlen = 0; | |
1665 | int curve_id = 0; | |
d02b48c6 | 1666 | #endif |
0f113f3e MC |
1667 | EVP_PKEY *pkey; |
1668 | const EVP_MD *md = NULL; | |
1669 | unsigned char *p, *d; | |
1670 | int al, i; | |
1671 | unsigned long type; | |
1672 | int n; | |
0f113f3e MC |
1673 | BIGNUM *r[4]; |
1674 | int nr[4], kn; | |
1675 | BUF_MEM *buf; | |
bfb0641f | 1676 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
0f113f3e | 1677 | |
6e59a892 RL |
1678 | if (md_ctx == NULL) { |
1679 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
1680 | al = SSL_AD_INTERNAL_ERROR; | |
1681 | goto f_err; | |
1682 | } | |
0f113f3e | 1683 | |
e27f234a | 1684 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a MC |
1685 | |
1686 | buf = s->init_buf; | |
0f113f3e | 1687 | |
e27f234a MC |
1688 | r[0] = r[1] = r[2] = r[3] = NULL; |
1689 | n = 0; | |
85269210 | 1690 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1691 | if (type & SSL_PSK) { |
1692 | /* | |
1693 | * reserve size for record length and PSK identity hint | |
1694 | */ | |
1695 | n += 2; | |
1696 | if (s->cert->psk_identity_hint) | |
1697 | n += strlen(s->cert->psk_identity_hint); | |
1698 | } | |
1699 | /* Plain PSK or RSAPSK nothing to do */ | |
1700 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1701 | } else | |
85269210 | 1702 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1703 | #ifndef OPENSSL_NO_DH |
e27f234a | 1704 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
1705 | CERT *cert = s->cert; |
1706 | ||
e2b420fd DSH |
1707 | EVP_PKEY *pkdhp = NULL; |
1708 | DH *dh; | |
1709 | ||
e27f234a | 1710 | if (s->cert->dh_tmp_auto) { |
e2b420fd DSH |
1711 | DH *dhp = ssl_get_auto_dh(s); |
1712 | pkdh = EVP_PKEY_new(); | |
1713 | if (pkdh == NULL || dhp == NULL) { | |
1714 | DH_free(dhp); | |
e27f234a MC |
1715 | al = SSL_AD_INTERNAL_ERROR; |
1716 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1717 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1718 | goto f_err; |
0f113f3e | 1719 | } |
e2b420fd DSH |
1720 | EVP_PKEY_assign_DH(pkdh, dhp); |
1721 | pkdhp = pkdh; | |
1722 | } else { | |
1723 | pkdhp = cert->dh_tmp; | |
1724 | } | |
1725 | if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { | |
1726 | DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); | |
1727 | pkdh = ssl_dh_to_pkey(dhp); | |
1728 | if (pkdh == NULL) { | |
1729 | al = SSL_AD_INTERNAL_ERROR; | |
1730 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1731 | ERR_R_INTERNAL_ERROR); | |
1732 | goto f_err; | |
1733 | } | |
1734 | pkdhp = pkdh; | |
1735 | } | |
1736 | if (pkdhp == NULL) { | |
e27f234a MC |
1737 | al = SSL_AD_HANDSHAKE_FAILURE; |
1738 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1739 | SSL_R_MISSING_TMP_DH_KEY); | |
1740 | goto f_err; | |
1741 | } | |
1742 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
e2b420fd | 1743 | EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { |
e27f234a MC |
1744 | al = SSL_AD_HANDSHAKE_FAILURE; |
1745 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1746 | SSL_R_DH_KEY_TOO_SMALL); | |
1747 | goto f_err; | |
1748 | } | |
e2b420fd | 1749 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1750 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1751 | ERR_R_INTERNAL_ERROR); | |
1752 | goto err; | |
1753 | } | |
0f113f3e | 1754 | |
e2b420fd | 1755 | s->s3->tmp.pkey = ssl_generate_pkey(pkdhp, NID_undef); |
e27f234a | 1756 | |
e2b420fd DSH |
1757 | if (s->s3->tmp.pkey == NULL) { |
1758 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
ffaef3f1 | 1759 | goto err; |
e27f234a | 1760 | } |
e2b420fd DSH |
1761 | |
1762 | dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); | |
1763 | ||
1764 | EVP_PKEY_free(pkdh); | |
1765 | pkdh = NULL; | |
1766 | ||
e27f234a MC |
1767 | r[0] = dh->p; |
1768 | r[1] = dh->g; | |
1769 | r[2] = dh->pub_key; | |
1770 | } else | |
d02b48c6 | 1771 | #endif |
10bf4fc2 | 1772 | #ifndef OPENSSL_NO_EC |
e27f234a | 1773 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 1774 | int nid; |
e27f234a | 1775 | |
880d9d86 | 1776 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1777 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1778 | ERR_R_INTERNAL_ERROR); | |
1779 | goto err; | |
1780 | } | |
1781 | ||
57be4444 DSH |
1782 | /* Get NID of appropriate shared curve */ |
1783 | nid = tls1_shared_curve(s, -2); | |
1784 | curve_id = tls1_ec_nid2curve_id(nid); | |
1785 | if (curve_id == 0) { | |
e27f234a MC |
1786 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1787 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1788 | goto err; | |
1789 | } | |
880d9d86 DSH |
1790 | s->s3->tmp.pkey = ssl_generate_pkey(NULL, nid); |
1791 | /* Generate a new key for this curve */ | |
1792 | if (s->s3->tmp.pkey == NULL) { | |
57be4444 | 1793 | al = SSL_AD_INTERNAL_ERROR; |
880d9d86 | 1794 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
1795 | goto f_err; |
1796 | } | |
1797 | ||
880d9d86 DSH |
1798 | /* Encode the public key. */ |
1799 | encodedlen = EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(s->s3->tmp.pkey), | |
1800 | POINT_CONVERSION_UNCOMPRESSED, | |
cae41364 | 1801 | &encodedPoint, NULL); |
0f113f3e | 1802 | |
e27f234a | 1803 | if (encodedlen == 0) { |
cae41364 | 1804 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
1805 | goto err; |
1806 | } | |
0f113f3e | 1807 | |
e27f234a | 1808 | /* |
57be4444 DSH |
1809 | * We only support named (not generic) curves in ECDH ephemeral key |
1810 | * exchanges. In this situation, we need four additional bytes to | |
1811 | * encode the entire ServerECDHParams structure. | |
e27f234a MC |
1812 | */ |
1813 | n += 4 + encodedlen; | |
0f113f3e | 1814 | |
e27f234a MC |
1815 | /* |
1816 | * We'll generate the serverKeyExchange message explicitly so we | |
1817 | * can set these to NULLs | |
1818 | */ | |
1819 | r[0] = NULL; | |
1820 | r[1] = NULL; | |
1821 | r[2] = NULL; | |
1822 | r[3] = NULL; | |
1823 | } else | |
10bf4fc2 | 1824 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1825 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1826 | if (type & SSL_kSRP) { |
1827 | if ((s->srp_ctx.N == NULL) || | |
1828 | (s->srp_ctx.g == NULL) || | |
1829 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1830 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1831 | SSL_R_MISSING_SRP_PARAM); | |
1832 | goto err; | |
0f113f3e | 1833 | } |
e27f234a MC |
1834 | r[0] = s->srp_ctx.N; |
1835 | r[1] = s->srp_ctx.g; | |
1836 | r[2] = s->srp_ctx.s; | |
1837 | r[3] = s->srp_ctx.B; | |
1838 | } else | |
1839 | #endif | |
1840 | { | |
1841 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1842 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1843 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1844 | goto f_err; | |
1845 | } | |
1846 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
1847 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 1848 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1849 | if ((i == 2) && (type & SSL_kSRP)) |
1850 | n += 1 + nr[i]; | |
1851 | else | |
edc032b5 | 1852 | #endif |
e27f234a MC |
1853 | n += 2 + nr[i]; |
1854 | } | |
0f113f3e | 1855 | |
e27f234a MC |
1856 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
1857 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
1858 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1859 | == NULL) { | |
1860 | al = SSL_AD_DECODE_ERROR; | |
1861 | goto f_err; | |
0f113f3e | 1862 | } |
e27f234a MC |
1863 | kn = EVP_PKEY_size(pkey); |
1864 | } else { | |
1865 | pkey = NULL; | |
1866 | kn = 0; | |
1867 | } | |
0f113f3e | 1868 | |
e27f234a MC |
1869 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
1870 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
1871 | goto err; | |
1872 | } | |
1873 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1874 | |
85269210 | 1875 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1876 | if (type & SSL_PSK) { |
1877 | /* copy PSK identity hint */ | |
1878 | if (s->cert->psk_identity_hint) { | |
1879 | s2n(strlen(s->cert->psk_identity_hint), p); | |
1880 | strncpy((char *)p, s->cert->psk_identity_hint, | |
1881 | strlen(s->cert->psk_identity_hint)); | |
1882 | p += strlen(s->cert->psk_identity_hint); | |
1883 | } else { | |
1884 | s2n(0, p); | |
85269210 | 1885 | } |
e27f234a | 1886 | } |
85269210 DSH |
1887 | #endif |
1888 | ||
e27f234a | 1889 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 1890 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1891 | if ((i == 2) && (type & SSL_kSRP)) { |
1892 | *p = nr[i]; | |
1893 | p++; | |
1894 | } else | |
edc032b5 | 1895 | #endif |
e27f234a MC |
1896 | s2n(nr[i], p); |
1897 | BN_bn2bin(r[i], p); | |
1898 | p += nr[i]; | |
1899 | } | |
d02b48c6 | 1900 | |
10bf4fc2 | 1901 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1902 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1903 | /* | |
1904 | * XXX: For now, we only support named (not generic) curves. In | |
1905 | * this situation, the serverKeyExchange message has: [1 byte | |
1906 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
1907 | * point], followed by the actual encoded point itself | |
1908 | */ | |
1909 | *p = NAMED_CURVE_TYPE; | |
1910 | p += 1; | |
1911 | *p = 0; | |
1912 | p += 1; | |
1913 | *p = curve_id; | |
1914 | p += 1; | |
1915 | *p = encodedlen; | |
1916 | p += 1; | |
1917 | memcpy(p, encodedPoint, encodedlen); | |
1918 | OPENSSL_free(encodedPoint); | |
1919 | encodedPoint = NULL; | |
1920 | p += encodedlen; | |
1921 | } | |
ea262260 BM |
1922 | #endif |
1923 | ||
e27f234a MC |
1924 | /* not anonymous */ |
1925 | if (pkey != NULL) { | |
1926 | /* | |
1927 | * n is the length of the params, they start at &(d[4]) and p | |
1928 | * points to the space at the end. | |
1929 | */ | |
e27f234a MC |
1930 | if (md) { |
1931 | /* send signature algorithm */ | |
1932 | if (SSL_USE_SIGALGS(s)) { | |
1933 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
1934 | /* Should never happen */ | |
1935 | al = SSL_AD_INTERNAL_ERROR; | |
1936 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1937 | ERR_R_INTERNAL_ERROR); | |
1938 | goto f_err; | |
0f113f3e | 1939 | } |
e27f234a MC |
1940 | p += 2; |
1941 | } | |
a2f9200f | 1942 | #ifdef SSL_DEBUG |
e27f234a | 1943 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 1944 | #endif |
6e59a892 RL |
1945 | if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0 |
1946 | || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]), | |
5f3d93e4 | 1947 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 | 1948 | || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]), |
5f3d93e4 | 1949 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 RL |
1950 | || EVP_SignUpdate(md_ctx, d, n) <= 0 |
1951 | || EVP_SignFinal(md_ctx, &(p[2]), | |
5f3d93e4 | 1952 | (unsigned int *)&i, pkey) <= 0) { |
e27f234a | 1953 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); |
5f3d93e4 MC |
1954 | al = SSL_AD_INTERNAL_ERROR; |
1955 | goto f_err; | |
0f113f3e | 1956 | } |
e27f234a MC |
1957 | s2n(i, p); |
1958 | n += i + 2; | |
1959 | if (SSL_USE_SIGALGS(s)) | |
1960 | n += 2; | |
1961 | } else { | |
1962 | /* Is this error check actually needed? */ | |
77d514c5 | 1963 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1964 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1965 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
1966 | goto f_err; |
1967 | } | |
0f113f3e MC |
1968 | } |
1969 | ||
e27f234a MC |
1970 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
1971 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1972 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
1973 | goto f_err; | |
1974 | } | |
1975 | ||
bfb0641f | 1976 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 1977 | return 1; |
0f113f3e MC |
1978 | f_err: |
1979 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1980 | err: | |
e2b420fd DSH |
1981 | #ifndef OPENSSL_NO_DH |
1982 | EVP_PKEY_free(pkdh); | |
1983 | #endif | |
556efe79 | 1984 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 1985 | OPENSSL_free(encodedPoint); |
ea262260 | 1986 | #endif |
bfb0641f | 1987 | EVP_MD_CTX_free(md_ctx); |
fe3a3291 | 1988 | ossl_statem_set_error(s); |
e27f234a | 1989 | return 0; |
0f113f3e | 1990 | } |
d02b48c6 | 1991 | |
e27f234a | 1992 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
1993 | { |
1994 | unsigned char *p, *d; | |
1995 | int i, j, nl, off, n; | |
1996 | STACK_OF(X509_NAME) *sk = NULL; | |
1997 | X509_NAME *name; | |
1998 | BUF_MEM *buf; | |
1999 | ||
e27f234a | 2000 | buf = s->init_buf; |
0f113f3e | 2001 | |
e27f234a | 2002 | d = p = ssl_handshake_start(s); |
0f113f3e | 2003 | |
e27f234a MC |
2004 | /* get the list of acceptable cert types */ |
2005 | p++; | |
2006 | n = ssl3_get_req_cert_type(s, p); | |
2007 | d[0] = n; | |
2008 | p += n; | |
2009 | n++; | |
0f113f3e | 2010 | |
e27f234a MC |
2011 | if (SSL_USE_SIGALGS(s)) { |
2012 | const unsigned char *psigs; | |
2013 | unsigned char *etmp = p; | |
2014 | nl = tls12_get_psigalgs(s, &psigs); | |
2015 | /* Skip over length for now */ | |
0f113f3e | 2016 | p += 2; |
e27f234a MC |
2017 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
2018 | /* Now fill in length */ | |
2019 | s2n(nl, etmp); | |
2020 | p += nl; | |
2021 | n += nl + 2; | |
2022 | } | |
0f113f3e | 2023 | |
e27f234a MC |
2024 | off = n; |
2025 | p += 2; | |
2026 | n += 2; | |
2027 | ||
2028 | sk = SSL_get_client_CA_list(s); | |
2029 | nl = 0; | |
2030 | if (sk != NULL) { | |
2031 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
2032 | name = sk_X509_NAME_value(sk, i); | |
2033 | j = i2d_X509_NAME(name, NULL); | |
2034 | if (!BUF_MEM_grow_clean | |
2035 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
2036 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2037 | ERR_R_BUF_LIB); | |
2038 | goto err; | |
0f113f3e | 2039 | } |
e27f234a MC |
2040 | p = ssl_handshake_start(s) + n; |
2041 | s2n(j, p); | |
2042 | i2d_X509_NAME(name, &p); | |
2043 | n += 2 + j; | |
2044 | nl += 2 + j; | |
0f113f3e | 2045 | } |
e27f234a MC |
2046 | } |
2047 | /* else no CA names */ | |
2048 | p = ssl_handshake_start(s) + off; | |
2049 | s2n(nl, p); | |
d02b48c6 | 2050 | |
e27f234a MC |
2051 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2052 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2053 | goto err; | |
0f113f3e | 2054 | } |
d02b48c6 | 2055 | |
e27f234a MC |
2056 | s->s3->tmp.cert_request = 1; |
2057 | ||
2058 | return 1; | |
0f113f3e | 2059 | err: |
fe3a3291 | 2060 | ossl_statem_set_error(s); |
e27f234a | 2061 | return 0; |
0f113f3e | 2062 | } |
d02b48c6 | 2063 | |
be3583fa | 2064 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
e27f234a MC |
2065 | { |
2066 | int al; | |
2067 | unsigned int i; | |
0f113f3e | 2068 | unsigned long alg_k; |
bc36ee62 | 2069 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
2070 | RSA *rsa = NULL; |
2071 | EVP_PKEY *pkey = NULL; | |
79df9d62 | 2072 | #endif |
b22d7113 | 2073 | #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) |
880d9d86 | 2074 | EVP_PKEY *ckey = NULL; |
ea262260 | 2075 | #endif |
73999b62 | 2076 | PACKET enc_premaster; |
20ca916d | 2077 | unsigned char *data, *rsa_decrypt = NULL; |
ea262260 | 2078 | |
0f113f3e | 2079 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
d02b48c6 | 2080 | |
85269210 DSH |
2081 | #ifndef OPENSSL_NO_PSK |
2082 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2083 | if (alg_k & SSL_PSK) { | |
2084 | unsigned char psk[PSK_MAX_PSK_LEN]; | |
2085 | size_t psklen; | |
73999b62 | 2086 | PACKET psk_identity; |
efcdbcbe | 2087 | |
73999b62 | 2088 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
85269210 | 2089 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2090 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2091 | goto f_err; |
2092 | } | |
6d41fc80 | 2093 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { |
85269210 | 2094 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2095 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2096 | SSL_R_DATA_LENGTH_TOO_LONG); |
2097 | goto f_err; | |
2098 | } | |
2099 | if (s->psk_server_callback == NULL) { | |
2100 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2101 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2102 | SSL_R_PSK_NO_SERVER_CB); |
2103 | goto f_err; | |
2104 | } | |
2105 | ||
6d41fc80 | 2106 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
f0659bdb | 2107 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 | 2108 | al = SSL_AD_INTERNAL_ERROR; |
efcdbcbe MC |
2109 | goto f_err; |
2110 | } | |
85269210 DSH |
2111 | |
2112 | psklen = s->psk_server_callback(s, s->session->psk_identity, | |
2113 | psk, sizeof(psk)); | |
2114 | ||
2115 | if (psklen > PSK_MAX_PSK_LEN) { | |
2116 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2117 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2118 | goto f_err; |
2119 | } else if (psklen == 0) { | |
2120 | /* | |
2121 | * PSK related to the given identity not found | |
2122 | */ | |
e27f234a | 2123 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2124 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2125 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2126 | goto f_err; | |
2127 | } | |
2128 | ||
2129 | OPENSSL_free(s->s3->tmp.psk); | |
7644a9ae | 2130 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); |
85269210 DSH |
2131 | OPENSSL_cleanse(psk, psklen); |
2132 | ||
2133 | if (s->s3->tmp.psk == NULL) { | |
2134 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2135 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
85269210 DSH |
2136 | goto f_err; |
2137 | } | |
2138 | ||
2139 | s->s3->tmp.psklen = psklen; | |
85269210 DSH |
2140 | } |
2141 | if (alg_k & SSL_kPSK) { | |
2142 | /* Identity extracted earlier: should be nothing left */ | |
73999b62 | 2143 | if (PACKET_remaining(pkt) != 0) { |
85269210 | 2144 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2145 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2146 | goto f_err; |
2147 | } | |
2148 | /* PSK handled by ssl_generate_master_secret */ | |
2149 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
2150 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2151 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2152 | goto f_err; |
2153 | } | |
2154 | } else | |
2155 | #endif | |
bc36ee62 | 2156 | #ifndef OPENSSL_NO_RSA |
85269210 | 2157 | if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
0f113f3e MC |
2158 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2159 | int decrypt_len; | |
2160 | unsigned char decrypt_good, version_good; | |
2161 | size_t j; | |
2162 | ||
2163 | /* FIX THIS UP EAY EAY EAY EAY */ | |
361a1191 KR |
2164 | pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; |
2165 | if ((pkey == NULL) || | |
2166 | (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { | |
2167 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2168 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2169 | SSL_R_MISSING_RSA_CERTIFICATE); | |
2170 | goto f_err; | |
0f113f3e | 2171 | } |
361a1191 | 2172 | rsa = pkey->pkey.rsa; |
0f113f3e | 2173 | |
20ca916d EK |
2174 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ |
2175 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
73999b62 | 2176 | enc_premaster = *pkt; |
20ca916d | 2177 | } else { |
73999b62 MC |
2178 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) |
2179 | || PACKET_remaining(pkt) != 0) { | |
1c9ed1d8 KR |
2180 | al = SSL_AD_DECODE_ERROR; |
2181 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2182 | SSL_R_LENGTH_MISMATCH); | |
2183 | goto f_err; | |
efcdbcbe | 2184 | } |
0f113f3e MC |
2185 | } |
2186 | ||
2187 | /* | |
20ca916d EK |
2188 | * We want to be sure that the plaintext buffer size makes it safe to |
2189 | * iterate over the entire size of a premaster secret | |
2190 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2191 | * their ciphertext cannot accommodate a premaster secret anyway. | |
0f113f3e | 2192 | */ |
20ca916d EK |
2193 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { |
2194 | al = SSL_AD_INTERNAL_ERROR; | |
f0659bdb | 2195 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
20ca916d | 2196 | RSA_R_KEY_SIZE_TOO_SMALL); |
0f113f3e MC |
2197 | goto f_err; |
2198 | } | |
2199 | ||
20ca916d EK |
2200 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2201 | if (rsa_decrypt == NULL) { | |
efcdbcbe | 2202 | al = SSL_AD_INTERNAL_ERROR; |
f0659bdb | 2203 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2204 | goto f_err; |
2205 | } | |
20ca916d | 2206 | |
0f113f3e MC |
2207 | /* |
2208 | * We must not leak whether a decryption failure occurs because of | |
2209 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2210 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2211 | * generates a random premaster secret for the case that the decrypt | |
2212 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2213 | */ | |
2214 | ||
266483d2 | 2215 | if (RAND_bytes(rand_premaster_secret, |
20ca916d | 2216 | sizeof(rand_premaster_secret)) <= 0) { |
0f113f3e | 2217 | goto err; |
20ca916d EK |
2218 | } |
2219 | ||
2220 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2221 | PACKET_data(&enc_premaster), | |
2222 | rsa_decrypt, rsa, RSA_PKCS1_PADDING); | |
0f113f3e MC |
2223 | ERR_clear_error(); |
2224 | ||
2225 | /* | |
2226 | * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will | |
2227 | * be 0xff if so and zero otherwise. | |
2228 | */ | |
2229 | decrypt_good = | |
2230 | constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); | |
2231 | ||
2232 | /* | |
2233 | * If the version in the decrypted pre-master secret is correct then | |
2234 | * version_good will be 0xff, otherwise it'll be zero. The | |
2235 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2236 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2237 | * check as a "bad version oracle". Thus version checks are done in | |
2238 | * constant time and are treated like any other decryption error. | |
2239 | */ | |
2240 | version_good = | |
20ca916d EK |
2241 | constant_time_eq_8(rsa_decrypt[0], |
2242 | (unsigned)(s->client_version >> 8)); | |
0f113f3e | 2243 | version_good &= |
20ca916d EK |
2244 | constant_time_eq_8(rsa_decrypt[1], |
2245 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e MC |
2246 | |
2247 | /* | |
2248 | * The premaster secret must contain the same version number as the | |
2249 | * ClientHello to detect version rollback attacks (strangely, the | |
2250 | * protocol does not offer such protection for DH ciphersuites). | |
2251 | * However, buggy clients exist that send the negotiated protocol | |
2252 | * version instead if the server does not support the requested | |
2253 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2254 | * clients. | |
2255 | */ | |
2256 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2257 | unsigned char workaround_good; | |
2258 | workaround_good = | |
20ca916d | 2259 | constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8)); |
0f113f3e | 2260 | workaround_good &= |
20ca916d EK |
2261 | constant_time_eq_8(rsa_decrypt[1], |
2262 | (unsigned)(s->version & 0xff)); | |
0f113f3e MC |
2263 | version_good |= workaround_good; |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | * Both decryption and version must be good for decrypt_good to | |
2268 | * remain non-zero (0xff). | |
2269 | */ | |
2270 | decrypt_good &= version_good; | |
2271 | ||
2272 | /* | |
2273 | * Now copy rand_premaster_secret over from p using | |
2274 | * decrypt_good_mask. If decryption failed, then p does not | |
2275 | * contain valid plaintext, however, a check above guarantees | |
2276 | * it is still sufficiently large to read from. | |
2277 | */ | |
2278 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
20ca916d EK |
2279 | rsa_decrypt[j] = |
2280 | constant_time_select_8(decrypt_good, rsa_decrypt[j], | |
2281 | rand_premaster_secret[j]); | |
0f113f3e MC |
2282 | } |
2283 | ||
20ca916d EK |
2284 | if (!ssl_generate_master_secret(s, rsa_decrypt, |
2285 | sizeof(rand_premaster_secret), 0)) { | |
69f68237 | 2286 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2287 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2288 | goto f_err; |
2289 | } | |
20ca916d EK |
2290 | OPENSSL_free(rsa_decrypt); |
2291 | rsa_decrypt = NULL; | |
0f113f3e | 2292 | } else |
4c5fac4a | 2293 | #endif |
bc36ee62 | 2294 | #ifndef OPENSSL_NO_DH |
bc71f910 | 2295 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
e2b420fd DSH |
2296 | EVP_PKEY *skey = NULL; |
2297 | DH *cdh; | |
efcdbcbe | 2298 | |
73999b62 | 2299 | if (!PACKET_get_net_2(pkt, &i)) { |
85269210 | 2300 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
d3cc5e61 | 2301 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2302 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
d3cc5e61 MC |
2303 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2304 | goto f_err; | |
2305 | } | |
0f113f3e | 2306 | i = 0; |
d3cc5e61 | 2307 | } |
73999b62 | 2308 | if (PACKET_remaining(pkt) != i) { |
7538cb82 DSH |
2309 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2310 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); | |
2311 | goto err; | |
0f113f3e | 2312 | } |
e2b420fd DSH |
2313 | skey = s->s3->tmp.pkey; |
2314 | if (skey == NULL) { | |
0f113f3e | 2315 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2316 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2317 | SSL_R_MISSING_TMP_DH_KEY); |
2318 | goto f_err; | |
e2b420fd | 2319 | } |
0f113f3e | 2320 | |
73999b62 | 2321 | if (PACKET_remaining(pkt) == 0L) { |
bc71f910 DSH |
2322 | al = SSL_AD_HANDSHAKE_FAILURE; |
2323 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2324 | SSL_R_MISSING_TMP_DH_KEY); | |
2325 | goto f_err; | |
2326 | } | |
2327 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2328 | /* We already checked we have enough data */ | |
2329 | al = SSL_AD_INTERNAL_ERROR; | |
2330 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2331 | ERR_R_INTERNAL_ERROR); | |
2332 | goto f_err; | |
efcdbcbe | 2333 | } |
e2b420fd DSH |
2334 | ckey = EVP_PKEY_new(); |
2335 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { | |
e27f234a | 2336 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); |
0f113f3e MC |
2337 | goto err; |
2338 | } | |
e2b420fd DSH |
2339 | cdh = EVP_PKEY_get0_DH(ckey); |
2340 | cdh->pub_key = BN_bin2bn(data, i, NULL); | |
2341 | if (cdh->pub_key == NULL) { | |
2342 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); | |
0f113f3e MC |
2343 | goto err; |
2344 | } | |
2345 | ||
e2b420fd | 2346 | if (ssl_derive(s, skey, ckey) == 0) { |
69f68237 | 2347 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2348 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2349 | goto f_err; |
2350 | } | |
e2b420fd DSH |
2351 | |
2352 | EVP_PKEY_free(ckey); | |
2353 | ckey = NULL; | |
2354 | ||
0f113f3e | 2355 | } else |
d02b48c6 | 2356 | #endif |
ea262260 | 2357 | |
556efe79 | 2358 | #ifndef OPENSSL_NO_EC |
85269210 | 2359 | if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) { |
880d9d86 | 2360 | EVP_PKEY *skey = NULL; |
0f113f3e | 2361 | |
0f113f3e MC |
2362 | /* Let's get server private key and group information */ |
2363 | if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { | |
2364 | /* use the certificate */ | |
880d9d86 | 2365 | skey = s->cert->pkeys[SSL_PKEY_ECC].privatekey; |
0f113f3e MC |
2366 | } else { |
2367 | /* | |
2368 | * use the ephermeral values we saved when generating the | |
2369 | * ServerKeyExchange msg. | |
2370 | */ | |
880d9d86 | 2371 | skey = s->s3->tmp.pkey; |
0f113f3e MC |
2372 | } |
2373 | ||
73999b62 | 2374 | if (PACKET_remaining(pkt) == 0L) { |
c66ce5eb DSH |
2375 | /* We don't support ECDH client auth */ |
2376 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2377 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2378 | SSL_R_MISSING_TMP_ECDH_KEY); | |
2379 | goto f_err; | |
0f113f3e MC |
2380 | } else { |
2381 | /* | |
2382 | * Get client's public key from encoded point in the | |
2383 | * ClientKeyExchange message. | |
2384 | */ | |
0f113f3e MC |
2385 | |
2386 | /* Get encoded point length */ | |
73999b62 | 2387 | if (!PACKET_get_1(pkt, &i)) { |
efcdbcbe | 2388 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2389 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2390 | SSL_R_LENGTH_MISMATCH); |
2391 | goto f_err; | |
2392 | } | |
73999b62 MC |
2393 | if (!PACKET_get_bytes(pkt, &data, i) |
2394 | || PACKET_remaining(pkt) != 0) { | |
e27f234a | 2395 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2396 | goto err; |
2397 | } | |
880d9d86 DSH |
2398 | ckey = EVP_PKEY_new(); |
2399 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
2400 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
2401 | goto err; | |
2402 | } | |
2403 | if (EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(ckey), data, i, | |
2404 | NULL) == 0) { | |
e27f234a | 2405 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2406 | goto err; |
2407 | } | |
0f113f3e MC |
2408 | } |
2409 | ||
880d9d86 | 2410 | if (ssl_derive(s, skey, ckey) == 0) { |
69f68237 | 2411 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2412 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2413 | goto f_err; |
2414 | } | |
880d9d86 DSH |
2415 | |
2416 | EVP_PKEY_free(ckey); | |
2417 | ckey = NULL; | |
2418 | ||
e27f234a | 2419 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2420 | } else |
ddac1974 | 2421 | #endif |
edc032b5 | 2422 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 2423 | if (alg_k & SSL_kSRP) { |
73999b62 MC |
2424 | if (!PACKET_get_net_2(pkt, &i) |
2425 | || !PACKET_get_bytes(pkt, &data, i)) { | |
0f113f3e | 2426 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2427 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); |
0f113f3e MC |
2428 | goto f_err; |
2429 | } | |
efcdbcbe | 2430 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { |
e27f234a | 2431 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); |
0f113f3e MC |
2432 | goto err; |
2433 | } | |
2434 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2435 | || BN_is_zero(s->srp_ctx.A)) { | |
2436 | al = SSL_AD_ILLEGAL_PARAMETER; | |
e27f234a | 2437 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2438 | SSL_R_BAD_SRP_PARAMETERS); |
2439 | goto f_err; | |
2440 | } | |
b548a1f1 | 2441 | OPENSSL_free(s->session->srp_username); |
7644a9ae | 2442 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); |
0f113f3e | 2443 | if (s->session->srp_username == NULL) { |
e27f234a | 2444 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2445 | goto err; |
2446 | } | |
2447 | ||
57b272b0 | 2448 | if (!srp_generate_server_master_secret(s)) { |
e27f234a | 2449 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
2450 | goto err; |
2451 | } | |
0f113f3e MC |
2452 | } else |
2453 | #endif /* OPENSSL_NO_SRP */ | |
2a9b9654 | 2454 | #ifndef OPENSSL_NO_GOST |
0f113f3e | 2455 | if (alg_k & SSL_kGOST) { |
0f113f3e MC |
2456 | EVP_PKEY_CTX *pkey_ctx; |
2457 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2458 | unsigned char premaster_secret[32], *start; | |
2459 | size_t outlen = 32, inlen; | |
2460 | unsigned long alg_a; | |
2461 | int Ttag, Tclass; | |
2462 | long Tlen; | |
73999b62 | 2463 | long sess_key_len; |
0f113f3e MC |
2464 | |
2465 | /* Get our certificate private key */ | |
2466 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
e44380a9 DB |
2467 | if (alg_a & SSL_aGOST12) { |
2468 | /* | |
2469 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2470 | */ | |
2471 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2472 | if (pk == NULL) { | |
2473 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2474 | } | |
2475 | if (pk == NULL) { | |
2476 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2477 | } | |
2478 | } else if (alg_a & SSL_aGOST01) { | |
0f113f3e | 2479 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; |
e44380a9 | 2480 | } |
0f113f3e MC |
2481 | |
2482 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
a71edf3b MC |
2483 | if (pkey_ctx == NULL) { |
2484 | al = SSL_AD_INTERNAL_ERROR; | |
2485 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2486 | goto f_err; | |
2487 | } | |
5f3d93e4 MC |
2488 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { |
2489 | al = SSL_AD_INTERNAL_ERROR; | |
2490 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2491 | goto f_err; | |
2492 | } | |
0f113f3e MC |
2493 | /* |
2494 | * If client certificate is present and is of the same type, maybe | |
2495 | * use it for key exchange. Don't mind errors from | |
2496 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2497 | * client certificate for authorization only. | |
2498 | */ | |
8382fd3a | 2499 | client_pub_pkey = X509_get0_pubkey(s->session->peer); |
0f113f3e MC |
2500 | if (client_pub_pkey) { |
2501 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2502 | ERR_clear_error(); | |
2503 | } | |
2504 | /* Decrypt session key */ | |
73999b62 MC |
2505 | sess_key_len = PACKET_remaining(pkt); |
2506 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
efcdbcbe | 2507 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2508 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2509 | goto gerr; |
efcdbcbe | 2510 | } |
73999b62 MC |
2511 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, |
2512 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2513 | || Ttag != V_ASN1_SEQUENCE | |
0f113f3e | 2514 | || Tclass != V_ASN1_UNIVERSAL) { |
5f3d93e4 | 2515 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2516 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2517 | SSL_R_DECRYPTION_FAILED); |
2518 | goto gerr; | |
2519 | } | |
efcdbcbe | 2520 | start = data; |
0f113f3e MC |
2521 | inlen = Tlen; |
2522 | if (EVP_PKEY_decrypt | |
2523 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
ba4f1331 | 2524 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2525 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2526 | SSL_R_DECRYPTION_FAILED); |
2527 | goto gerr; | |
2528 | } | |
2529 | /* Generate master secret */ | |
57b272b0 DSH |
2530 | if (!ssl_generate_master_secret(s, premaster_secret, |
2531 | sizeof(premaster_secret), 0)) { | |
69f68237 | 2532 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2533 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2534 | goto gerr; |
69f68237 | 2535 | } |
0f113f3e MC |
2536 | /* Check if pubkey from client certificate was used */ |
2537 | if (EVP_PKEY_CTX_ctrl | |
2538 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
a71a4966 | 2539 | s->statem.no_cert_verify = 1; |
e27f234a | 2540 | |
e27f234a MC |
2541 | EVP_PKEY_CTX_free(pkey_ctx); |
2542 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
0f113f3e | 2543 | gerr: |
0f113f3e | 2544 | EVP_PKEY_CTX_free(pkey_ctx); |
5f3d93e4 | 2545 | goto f_err; |
2a9b9654 MC |
2546 | } else |
2547 | #endif | |
2548 | { | |
0f113f3e | 2549 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2550 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
0f113f3e MC |
2551 | goto f_err; |
2552 | } | |
2553 | ||
e27f234a | 2554 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2555 | f_err: |
2556 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
556efe79 | 2557 | #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP) |
0f113f3e | 2558 | err: |
ea262260 | 2559 | #endif |
b22d7113 | 2560 | #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) |
880d9d86 | 2561 | EVP_PKEY_free(ckey); |
85269210 | 2562 | #endif |
c849c6d9 | 2563 | OPENSSL_free(rsa_decrypt); |
85269210 DSH |
2564 | #ifndef OPENSSL_NO_PSK |
2565 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2566 | s->s3->tmp.psk = NULL; | |
58964a49 | 2567 | #endif |
fe3a3291 | 2568 | ossl_statem_set_error(s); |
e27f234a | 2569 | return MSG_PROCESS_ERROR; |
0f113f3e | 2570 | } |
d02b48c6 | 2571 | |
be3583fa | 2572 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2573 | { |
94836de2 | 2574 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2575 | if (wst == WORK_MORE_A) { |
2576 | if (SSL_IS_DTLS(s)) { | |
2577 | unsigned char sctpauthkey[64]; | |
2578 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2579 | /* | |
2580 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2581 | * used. | |
2582 | */ | |
141eb8c6 MC |
2583 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2584 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2585 | |
2586 | if (SSL_export_keying_material(s, sctpauthkey, | |
2587 | sizeof(sctpauthkey), labelbuffer, | |
2588 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2589 | ossl_statem_set_error(s); |
c130dd8e MC |
2590 | return WORK_ERROR;; |
2591 | } | |
94836de2 | 2592 | |
c130dd8e MC |
2593 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2594 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2595 | } |
c130dd8e MC |
2596 | wst = WORK_MORE_B; |
2597 | } | |
94836de2 | 2598 | |
c130dd8e MC |
2599 | if ((wst == WORK_MORE_B) |
2600 | /* Is this SCTP? */ | |
2601 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2602 | /* Are we renegotiating? */ | |
2603 | && s->renegotiate | |
2604 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2605 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2606 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2607 | s->s3->in_read_app_data = 2; | |
2608 | s->rwstate = SSL_READING; | |
2609 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2610 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2611 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2612 | return WORK_MORE_B; |
2613 | } else { | |
fe3a3291 | 2614 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2615 | } |
2616 | #endif | |
2617 | ||
a71a4966 | 2618 | if (s->statem.no_cert_verify) { |
94836de2 MC |
2619 | /* No certificate verify so we no longer need the handshake_buffer */ |
2620 | BIO_free(s->s3->handshake_buffer); | |
e44380a9 | 2621 | s->s3->handshake_buffer = NULL; |
94836de2 | 2622 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2623 | } else { |
94836de2 MC |
2624 | if (!s->session->peer) { |
2625 | /* No peer certificate so we no longer need the handshake_buffer */ | |
2626 | BIO_free(s->s3->handshake_buffer); | |
2627 | return WORK_FINISHED_CONTINUE; | |
2628 | } | |
2629 | if (!s->s3->handshake_buffer) { | |
2630 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2631 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2632 | ossl_statem_set_error(s); |
94836de2 MC |
2633 | return WORK_ERROR; |
2634 | } | |
2635 | /* | |
2636 | * For sigalgs freeze the handshake buffer. If we support | |
2637 | * extms we've done this already so this is a no-op | |
2638 | */ | |
2639 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2640 | ossl_statem_set_error(s); |
94836de2 MC |
2641 | return WORK_ERROR; |
2642 | } | |
94836de2 MC |
2643 | } |
2644 | ||
2645 | return WORK_FINISHED_CONTINUE; | |
2646 | } | |
2647 | ||
be3583fa | 2648 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2649 | { |
2650 | EVP_PKEY *pkey = NULL; | |
2651 | unsigned char *sig, *data; | |
2652 | int al, ret = MSG_PROCESS_ERROR; | |
28f4580c | 2653 | int type = 0, j; |
e27f234a MC |
2654 | unsigned int len; |
2655 | X509 *peer; | |
2656 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2657 | long hdatalen = 0; |
2658 | void *hdata; | |
2659 | ||
bfb0641f | 2660 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
6e59a892 RL |
2661 | |
2662 | if (mctx == NULL) { | |
2663 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2664 | al = SSL_AD_INTERNAL_ERROR; | |
2665 | goto f_err; | |
2666 | } | |
e27f234a | 2667 | |
a0bd6493 | 2668 | peer = s->session->peer; |
8382fd3a | 2669 | pkey = X509_get0_pubkey(peer); |
a0bd6493 | 2670 | type = X509_certificate_type(peer, pkey); |
0f113f3e MC |
2671 | |
2672 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2673 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2674 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2675 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2676 | goto f_err; | |
2677 | } | |
2678 | ||
0f113f3e MC |
2679 | /* Check for broken implementations of GOST ciphersuites */ |
2680 | /* | |
2681 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2682 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2683 | */ |
2a9b9654 | 2684 | #ifndef OPENSSL_NO_GOST |
73999b62 | 2685 | if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) { |
f532a35d | 2686 | len = 64; |
2a9b9654 MC |
2687 | } else |
2688 | #endif | |
2689 | { | |
0f113f3e | 2690 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2691 | int rv; |
2692 | ||
73999b62 | 2693 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2694 | al = SSL_AD_DECODE_ERROR; |
2695 | goto f_err; | |
2696 | } | |
2697 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2698 | if (rv == -1) { |
2699 | al = SSL_AD_INTERNAL_ERROR; | |
2700 | goto f_err; | |
2701 | } else if (rv == 0) { | |
2702 | al = SSL_AD_DECODE_ERROR; | |
2703 | goto f_err; | |
2704 | } | |
f37f20ff | 2705 | #ifdef SSL_DEBUG |
0f113f3e | 2706 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2707 | #endif |
28f4580c | 2708 | } else { |
aa430c74 DSH |
2709 | /* Use default digest for this key type */ |
2710 | int idx = ssl_cert_type(NULL, pkey); | |
2711 | if (idx >= 0) | |
2712 | md = s->s3->tmp.md[idx]; | |
2713 | if (md == NULL) { | |
2714 | al = SSL_AD_INTERNAL_ERROR; | |
2715 | goto f_err; | |
2716 | } | |
0f113f3e | 2717 | } |
aa430c74 | 2718 | |
73999b62 | 2719 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2720 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2721 | al = SSL_AD_DECODE_ERROR; |
2722 | goto f_err; | |
2723 | } | |
2724 | } | |
2725 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
2726 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
2727 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 2728 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2729 | al = SSL_AD_DECODE_ERROR; |
2730 | goto f_err; | |
2731 | } | |
73999b62 | 2732 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2733 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2734 | al = SSL_AD_DECODE_ERROR; |
2735 | goto f_err; | |
2736 | } | |
0f113f3e | 2737 | |
28f4580c DSH |
2738 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2739 | if (hdatalen <= 0) { | |
2740 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2741 | al = SSL_AD_INTERNAL_ERROR; | |
2742 | goto f_err; | |
2743 | } | |
f37f20ff | 2744 | #ifdef SSL_DEBUG |
28f4580c | 2745 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2746 | #endif |
6e59a892 RL |
2747 | if (!EVP_VerifyInit_ex(mctx, md, NULL) |
2748 | || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) { | |
28f4580c DSH |
2749 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
2750 | al = SSL_AD_INTERNAL_ERROR; | |
2751 | goto f_err; | |
2752 | } | |
0f113f3e | 2753 | |
2a9b9654 | 2754 | #ifndef OPENSSL_NO_GOST |
28f4580c DSH |
2755 | if (pkey->type == NID_id_GostR3410_2001 |
2756 | || pkey->type == NID_id_GostR3410_2012_256 | |
2757 | || pkey->type == NID_id_GostR3410_2012_512) { | |
2a9b9654 | 2758 | BUF_reverse(data, NULL, len); |
28f4580c | 2759 | } |
2a9b9654 | 2760 | #endif |
e44380a9 | 2761 | |
28f4580c | 2762 | if (s->version == SSL3_VERSION |
6e59a892 | 2763 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
28f4580c DSH |
2764 | s->session->master_key_length, |
2765 | s->session->master_key)) { | |
2766 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2767 | al = SSL_AD_INTERNAL_ERROR; | |
2768 | goto f_err; | |
2769 | } | |
2770 | ||
6e59a892 | 2771 | if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) { |
28f4580c DSH |
2772 | al = SSL_AD_DECRYPT_ERROR; |
2773 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2774 | goto f_err; |
2775 | } | |
2776 | ||
c130dd8e | 2777 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2778 | if (0) { |
2779 | f_err: | |
2780 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 2781 | ossl_statem_set_error(s); |
0f113f3e | 2782 | } |
25aaa98a RS |
2783 | BIO_free(s->s3->handshake_buffer); |
2784 | s->s3->handshake_buffer = NULL; | |
bfb0641f | 2785 | EVP_MD_CTX_free(mctx); |
e27f234a | 2786 | return ret; |
0f113f3e | 2787 | } |
d02b48c6 | 2788 | |
be3583fa | 2789 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 2790 | { |
20dbe585 | 2791 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
2792 | X509 *x = NULL; |
2793 | unsigned long l, llen; | |
2794 | const unsigned char *certstart; | |
2795 | unsigned char *certbytes; | |
2796 | STACK_OF(X509) *sk = NULL; | |
73999b62 | 2797 | PACKET spkt; |
0f113f3e MC |
2798 | |
2799 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
2800 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2801 | goto f_err; | |
0f113f3e MC |
2802 | } |
2803 | ||
73999b62 MC |
2804 | if (!PACKET_get_net_3(pkt, &llen) |
2805 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
2806 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 2807 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2808 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2809 | goto f_err; |
2810 | } | |
0bc09ecd MC |
2811 | |
2812 | while (PACKET_remaining(&spkt) > 0) { | |
2813 | if (!PACKET_get_net_3(&spkt, &l) | |
2814 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 2815 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2816 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2817 | SSL_R_CERT_LENGTH_MISMATCH); |
2818 | goto f_err; | |
2819 | } | |
2820 | ||
0bc09ecd MC |
2821 | certstart = certbytes; |
2822 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 2823 | if (x == NULL) { |
e27f234a MC |
2824 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
2825 | goto f_err; | |
0f113f3e | 2826 | } |
0bc09ecd | 2827 | if (certbytes != (certstart + l)) { |
0f113f3e | 2828 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2829 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2830 | SSL_R_CERT_LENGTH_MISMATCH); |
2831 | goto f_err; | |
2832 | } | |
2833 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
2834 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2835 | goto f_err; | |
0f113f3e MC |
2836 | } |
2837 | x = NULL; | |
0f113f3e MC |
2838 | } |
2839 | ||
2840 | if (sk_X509_num(sk) <= 0) { | |
2841 | /* TLS does not mind 0 certs returned */ | |
2842 | if (s->version == SSL3_VERSION) { | |
2843 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2844 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2845 | SSL_R_NO_CERTIFICATES_RETURNED); |
2846 | goto f_err; | |
2847 | } | |
2848 | /* Fail for TLS only if we required a certificate */ | |
2849 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
2850 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 2851 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2852 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
2853 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2854 | goto f_err; | |
2855 | } | |
2856 | /* No client certificate so digest cached records */ | |
124037fd | 2857 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
2858 | goto f_err; |
2859 | } | |
2860 | } else { | |
2861 | EVP_PKEY *pkey; | |
2862 | i = ssl_verify_cert_chain(s, sk); | |
2863 | if (i <= 0) { | |
2864 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 2865 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2866 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
2867 | goto f_err; | |
2868 | } | |
2869 | if (i > 1) { | |
e27f234a | 2870 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
2871 | al = SSL_AD_HANDSHAKE_FAILURE; |
2872 | goto f_err; | |
2873 | } | |
8382fd3a | 2874 | pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); |
0f113f3e MC |
2875 | if (pkey == NULL) { |
2876 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2877 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2878 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
2879 | goto f_err; | |
2880 | } | |
0f113f3e MC |
2881 | } |
2882 | ||
222561fe | 2883 | X509_free(s->session->peer); |
0f113f3e MC |
2884 | s->session->peer = sk_X509_shift(sk); |
2885 | s->session->verify_result = s->verify_result; | |
2886 | ||
c34b0f99 DSH |
2887 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
2888 | s->session->peer_chain = sk; | |
0f113f3e MC |
2889 | /* |
2890 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
2891 | * certificate, while we do include it in s3_clnt.c | |
2892 | */ | |
0f113f3e | 2893 | sk = NULL; |
e27f234a | 2894 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
2895 | goto done; |
2896 | ||
0f113f3e | 2897 | f_err: |
66696478 | 2898 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 2899 | ossl_statem_set_error(s); |
66696478 | 2900 | done: |
222561fe RS |
2901 | X509_free(x); |
2902 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 2903 | return ret; |
0f113f3e | 2904 | } |
d02b48c6 | 2905 | |
e27f234a MC |
2906 | int tls_construct_server_certificate(SSL *s) |
2907 | { | |
2908 | CERT_PKEY *cpk; | |
2909 | ||
2910 | cpk = ssl_get_server_send_pkey(s); | |
2911 | if (cpk == NULL) { | |
2912 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2913 | ossl_statem_set_error(s); |
e27f234a MC |
2914 | return 0; |
2915 | } | |
2916 | ||
2917 | if (!ssl3_output_cert_chain(s, cpk)) { | |
2918 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2919 | ossl_statem_set_error(s); |
e27f234a MC |
2920 | return 0; |
2921 | } | |
2922 | ||
2923 | return 1; | |
2924 | } | |
2925 | ||
e27f234a MC |
2926 | int tls_construct_new_session_ticket(SSL *s) |
2927 | { | |
2928 | unsigned char *senc = NULL; | |
846ec07d | 2929 | EVP_CIPHER_CTX *ctx; |
bf7c6817 | 2930 | HMAC_CTX *hctx = NULL; |
e27f234a MC |
2931 | unsigned char *p, *macstart; |
2932 | const unsigned char *const_p; | |
2933 | int len, slen_full, slen; | |
2934 | SSL_SESSION *sess; | |
2935 | unsigned int hlen; | |
2936 | SSL_CTX *tctx = s->initial_ctx; | |
2937 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
2938 | unsigned char key_name[16]; | |
2939 | ||
2940 | /* get session encoding length */ | |
2941 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
2942 | /* | |
2943 | * Some length values are 16 bits, so forget it if session is too | |
2944 | * long | |
2945 | */ | |
2946 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 2947 | ossl_statem_set_error(s); |
e27f234a MC |
2948 | return 0; |
2949 | } | |
2950 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 2951 | if (senc == NULL) { |
fe3a3291 | 2952 | ossl_statem_set_error(s); |
e27f234a MC |
2953 | return 0; |
2954 | } | |
0f113f3e | 2955 | |
846ec07d | 2956 | ctx = EVP_CIPHER_CTX_new(); |
bf7c6817 | 2957 | hctx = HMAC_CTX_new(); |
0f113f3e | 2958 | |
e27f234a MC |
2959 | p = senc; |
2960 | if (!i2d_SSL_SESSION(s->session, &p)) | |
2961 | goto err; | |
687eaf27 | 2962 | |
e27f234a MC |
2963 | /* |
2964 | * create a fresh copy (not shared with other threads) to clean up | |
2965 | */ | |
2966 | const_p = senc; | |
2967 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
2968 | if (sess == NULL) | |
2969 | goto err; | |
2970 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 2971 | |
e27f234a MC |
2972 | slen = i2d_SSL_SESSION(sess, NULL); |
2973 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
2974 | SSL_SESSION_free(sess); | |
2975 | goto err; | |
2976 | } | |
2977 | p = senc; | |
2978 | if (!i2d_SSL_SESSION(sess, &p)) { | |
2979 | SSL_SESSION_free(sess); | |
2980 | goto err; | |
2981 | } | |
2982 | SSL_SESSION_free(sess); | |
0f113f3e | 2983 | |
e27f234a MC |
2984 | /*- |
2985 | * Grow buffer if need be: the length calculation is as | |
2986 | * follows handshake_header_length + | |
2987 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
2988 | * 16 (key name) + max_iv_len (iv length) + | |
2989 | * session_length + max_enc_block_size (max encrypted session | |
2990 | * length) + max_md_size (HMAC). | |
2991 | */ | |
2992 | if (!BUF_MEM_grow(s->init_buf, | |
2993 | SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + | |
2994 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
2995 | goto err; | |
0f113f3e | 2996 | |
e27f234a MC |
2997 | p = ssl_handshake_start(s); |
2998 | /* | |
2999 | * Initialize HMAC and cipher contexts. If callback present it does | |
3000 | * all the work otherwise use generated values from parent ctx. | |
3001 | */ | |
3002 | if (tctx->tlsext_ticket_key_cb) { | |
846ec07d | 3003 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx, hctx, 1) < 0) |
e27f234a MC |
3004 | goto err; |
3005 | } else { | |
3006 | if (RAND_bytes(iv, 16) <= 0) | |
687eaf27 | 3007 | goto err; |
846ec07d | 3008 | if (!EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, |
e27f234a | 3009 | tctx->tlsext_tick_aes_key, iv)) |
687eaf27 | 3010 | goto err; |
bf7c6817 | 3011 | if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, 16, |
e27f234a | 3012 | EVP_sha256(), NULL)) |
4f9fab6b | 3013 | goto err; |
e27f234a | 3014 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
0f113f3e MC |
3015 | } |
3016 | ||
e27f234a MC |
3017 | /* |
3018 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3019 | * for resumed session (for simplicity), and guess that tickets for | |
3020 | * new sessions will live as long as their sessions. | |
3021 | */ | |
3022 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3023 | ||
3024 | /* Skip ticket length for now */ | |
3025 | p += 2; | |
3026 | /* Output key name */ | |
3027 | macstart = p; | |
3028 | memcpy(p, key_name, 16); | |
3029 | p += 16; | |
3030 | /* output IV */ | |
846ec07d RL |
3031 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
3032 | p += EVP_CIPHER_CTX_iv_length(ctx); | |
e27f234a | 3033 | /* Encrypt session data */ |
846ec07d | 3034 | if (!EVP_EncryptUpdate(ctx, p, &len, senc, slen)) |
e27f234a MC |
3035 | goto err; |
3036 | p += len; | |
846ec07d | 3037 | if (!EVP_EncryptFinal(ctx, p, &len)) |
e27f234a MC |
3038 | goto err; |
3039 | p += len; | |
3040 | ||
bf7c6817 | 3041 | if (!HMAC_Update(hctx, macstart, p - macstart)) |
e27f234a | 3042 | goto err; |
bf7c6817 | 3043 | if (!HMAC_Final(hctx, p, &hlen)) |
e27f234a MC |
3044 | goto err; |
3045 | ||
846ec07d | 3046 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3047 | HMAC_CTX_free(hctx); |
846ec07d RL |
3048 | ctx = NULL; |
3049 | hctx = NULL; | |
e27f234a MC |
3050 | |
3051 | p += hlen; | |
3052 | /* Now write out lengths: p points to end of data written */ | |
3053 | /* Total length */ | |
3054 | len = p - ssl_handshake_start(s); | |
3055 | /* Skip ticket lifetime hint */ | |
3056 | p = ssl_handshake_start(s) + 4; | |
3057 | s2n(len - 6, p); | |
3058 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3059 | goto err; | |
3060 | OPENSSL_free(senc); | |
3061 | ||
3062 | return 1; | |
687eaf27 | 3063 | err: |
b548a1f1 | 3064 | OPENSSL_free(senc); |
846ec07d | 3065 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3066 | HMAC_CTX_free(hctx); |
fe3a3291 | 3067 | ossl_statem_set_error(s); |
e27f234a | 3068 | return 0; |
0f113f3e | 3069 | } |
67c8e7f4 | 3070 | |
e27f234a MC |
3071 | int tls_construct_cert_status(SSL *s) |
3072 | { | |
3073 | unsigned char *p; | |
3074 | /*- | |
3075 | * Grow buffer if need be: the length calculation is as | |
3076 | * follows 1 (message type) + 3 (message length) + | |
3077 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3078 | * + (ocsp response) | |
3079 | */ | |
3080 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3081 | ossl_statem_set_error(s); |
e27f234a MC |
3082 | return 0; |
3083 | } | |
3084 | ||
3085 | p = (unsigned char *)s->init_buf->data; | |
3086 | ||
3087 | /* do the header */ | |
3088 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3089 | /* message length */ | |
3090 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3091 | /* status type */ | |
3092 | *(p++) = s->tlsext_status_type; | |
3093 | /* length of OCSP response */ | |
3094 | l2n3(s->tlsext_ocsp_resplen, p); | |
3095 | /* actual response */ | |
3096 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3097 | /* number of bytes to write */ | |
3098 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3099 | s->init_off = 0; | |
3100 | ||
3101 | return 1; | |
3102 | } | |
3103 | ||
e481f9b9 | 3104 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3105 | /* |
3106 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3107 | * It sets the next_proto member in s if found | |
3108 | */ | |
be3583fa | 3109 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3110 | { |
73999b62 | 3111 | PACKET next_proto, padding; |
e27f234a MC |
3112 | size_t next_proto_len; |
3113 | ||
50e735f9 MC |
3114 | /*- |
3115 | * The payload looks like: | |
3116 | * uint8 proto_len; | |
3117 | * uint8 proto[proto_len]; | |
3118 | * uint8 padding_len; | |
3119 | * uint8 padding[padding_len]; | |
3120 | */ | |
73999b62 MC |
3121 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3122 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3123 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3124 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3125 | goto err; |
cf9b0b6f | 3126 | } |
0f113f3e | 3127 | |
6d41fc80 EK |
3128 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3129 | &next_proto_len)) { | |
3130 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3131 | goto err; |
3132 | } | |
3133 | ||
6d41fc80 | 3134 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3135 | |
e27f234a | 3136 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3137 | err: |
fe3a3291 | 3138 | ossl_statem_set_error(s); |
e27f234a | 3139 | return MSG_PROCESS_ERROR; |
0f113f3e | 3140 | } |
6434abbf | 3141 | #endif |
d45ba43d MC |
3142 | |
3143 | #define SSLV2_CIPHER_LEN 3 | |
3144 | ||
38a3cbfb EK |
3145 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3146 | PACKET *cipher_suites, | |
d45ba43d | 3147 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3148 | int sslv2format, int *al |
3149 | ) | |
d45ba43d MC |
3150 | { |
3151 | const SSL_CIPHER *c; | |
3152 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3153 | int n; |
3154 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3155 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3156 | |
38a3cbfb EK |
3157 | s->s3->send_connection_binding = 0; |
3158 | ||
3159 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3160 | ||
3161 | if (PACKET_remaining(cipher_suites) == 0) { | |
3162 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3163 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3164 | return NULL; | |
d45ba43d | 3165 | } |
38a3cbfb EK |
3166 | |
3167 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3168 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3169 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3170 | *al = SSL_AD_DECODE_ERROR; |
3171 | return NULL; | |
d45ba43d | 3172 | } |
38a3cbfb | 3173 | |
d45ba43d MC |
3174 | if ((skp == NULL) || (*skp == NULL)) { |
3175 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3176 | if(sk == NULL) { | |
3177 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3178 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3179 | return NULL; |
3180 | } | |
3181 | } else { | |
3182 | sk = *skp; | |
3183 | sk_SSL_CIPHER_zero(sk); | |
3184 | } | |
3185 | ||
38a3cbfb EK |
3186 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3187 | &s->s3->tmp.ciphers_rawlen)) { | |
3188 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3189 | goto err; |
3190 | } | |
d45ba43d | 3191 | |
38a3cbfb EK |
3192 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3193 | /* | |
20218b58 EK |
3194 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3195 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3196 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3197 | */ |
3198 | if (sslv2format && cipher[0] != '\0') | |
3199 | continue; | |
3200 | ||
d45ba43d | 3201 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3202 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3203 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3204 | /* SCSV fatal if renegotiating */ |
3205 | if (s->renegotiate) { | |
3206 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3207 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3208 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3209 | goto err; |
3210 | } | |
3211 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3212 | #ifdef OPENSSL_RI_DEBUG |
3213 | fprintf(stderr, "SCSV received by server\n"); | |
3214 | #endif | |
3215 | continue; | |
3216 | } | |
3217 | ||
3218 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3219 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3220 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3221 | /* |
3222 | * The SCSV indicates that the client previously tried a higher | |
3223 | * version. Fail if the current version is an unexpected | |
3224 | * downgrade. | |
3225 | */ | |
4fa52141 | 3226 | if (!ssl_check_version_downgrade(s)) { |
d45ba43d MC |
3227 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3228 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3229 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3230 | goto err; |
3231 | } | |
d45ba43d MC |
3232 | continue; |
3233 | } | |
3234 | ||
38a3cbfb EK |
3235 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3236 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3237 | if (c != NULL) { |
3238 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3239 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3240 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3241 | goto err; |
3242 | } | |
3243 | } | |
3244 | } | |
38a3cbfb EK |
3245 | if (PACKET_remaining(cipher_suites) > 0) { |
3246 | *al = SSL_AD_INTERNAL_ERROR; | |
3247 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3248 | goto err; | |
3249 | } | |
d45ba43d MC |
3250 | |
3251 | if (skp != NULL) | |
3252 | *skp = sk; | |
3253 | return (sk); | |
3254 | err: | |
3255 | if ((skp == NULL) || (*skp == NULL)) | |
3256 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3257 | return NULL; |
d45ba43d | 3258 | } |