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8ba708e5 | 1 | /* ssl/statem/statem_srvr.c -*- mode:C; c-file-style: "eay" -*- */ |
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 | */ | |
325 | if ( (alg_k & SSL_kDHE) | |
326 | || (alg_k & SSL_kECDHE) | |
61ae935a MC |
327 | /* |
328 | * PSK: send ServerKeyExchange if PSK identity hint if | |
329 | * provided | |
330 | */ | |
331 | #ifndef OPENSSL_NO_PSK | |
332 | /* Only send SKE if we have identity hint for plain PSK */ | |
333 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
334 | && s->cert->psk_identity_hint) | |
335 | /* For other PSK always send SKE */ | |
336 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
337 | #endif | |
338 | #ifndef OPENSSL_NO_SRP | |
339 | /* SRP: send ServerKeyExchange */ | |
340 | || (alg_k & SSL_kSRP) | |
341 | #endif | |
342 | ) { | |
343 | return 1; | |
344 | } | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Should we send a CertificateRequest message? | |
351 | * | |
352 | * Valid return values are: | |
353 | * 1: Yes | |
354 | * 0: No | |
355 | */ | |
bb3e20cf | 356 | static int send_certificate_request(SSL *s) |
61ae935a MC |
357 | { |
358 | if ( | |
359 | /* don't request cert unless asked for it: */ | |
360 | s->verify_mode & SSL_VERIFY_PEER | |
361 | /* | |
362 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
363 | * during re-negotiation: | |
364 | */ | |
365 | && ((s->session->peer == NULL) || | |
366 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) | |
367 | /* | |
368 | * never request cert in anonymous ciphersuites (see | |
369 | * section "Certificate request" in SSL 3 drafts and in | |
370 | * RFC 2246): | |
371 | */ | |
372 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
373 | /* | |
374 | * ... except when the application insists on | |
375 | * verification (against the specs, but s3_clnt.c accepts | |
376 | * this for SSL 3) | |
377 | */ | |
378 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
379 | /* don't request certificate for SRP auth */ | |
380 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
381 | /* | |
382 | * With normal PSK Certificates and Certificate Requests | |
383 | * are omitted | |
384 | */ | |
b7fa1f98 | 385 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { |
61ae935a MC |
386 | return 1; |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * server_write_transition() works out what handshake state to move to next | |
394 | * when the server is writing messages to be sent to the client. | |
395 | */ | |
8481f583 | 396 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s) |
61ae935a | 397 | { |
d6f1a6e9 | 398 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
399 | |
400 | switch(st->hand_state) { | |
401 | case TLS_ST_BEFORE: | |
402 | /* Just go straight to trying to read from the client */; | |
403 | return WRITE_TRAN_FINISHED; | |
404 | ||
405 | case TLS_ST_OK: | |
406 | /* We must be trying to renegotiate */ | |
407 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
408 | return WRITE_TRAN_CONTINUE; | |
409 | ||
410 | case TLS_ST_SW_HELLO_REQ: | |
411 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 412 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
413 | return WRITE_TRAN_CONTINUE; |
414 | ||
415 | case TLS_ST_SR_CLNT_HELLO: | |
416 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
417 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) | |
418 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; | |
419 | else | |
420 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
421 | return WRITE_TRAN_CONTINUE; | |
422 | ||
423 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
424 | return WRITE_TRAN_FINISHED; | |
425 | ||
426 | case TLS_ST_SW_SRVR_HELLO: | |
427 | if (s->hit) { | |
428 | if (s->tlsext_ticket_expected) | |
429 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
430 | else | |
431 | st->hand_state = TLS_ST_SW_CHANGE; | |
432 | } else { | |
433 | /* Check if it is anon DH or anon ECDH, */ | |
434 | /* normal PSK or SRP */ | |
435 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
436 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { | |
437 | st->hand_state = TLS_ST_SW_CERT; | |
438 | } else if (send_server_key_exchange(s)) { | |
439 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
440 | } else if (send_certificate_request(s)) { | |
441 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
442 | } else { | |
443 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
444 | } | |
445 | } | |
446 | return WRITE_TRAN_CONTINUE; | |
447 | ||
448 | case TLS_ST_SW_CERT: | |
449 | if (s->tlsext_status_expected) { | |
450 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
451 | return WRITE_TRAN_CONTINUE; | |
452 | } | |
453 | /* Fall through */ | |
454 | ||
455 | case TLS_ST_SW_CERT_STATUS: | |
456 | if (send_server_key_exchange(s)) { | |
457 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
458 | return WRITE_TRAN_CONTINUE; | |
459 | } | |
460 | /* Fall through */ | |
461 | ||
462 | case TLS_ST_SW_KEY_EXCH: | |
463 | if (send_certificate_request(s)) { | |
464 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
465 | return WRITE_TRAN_CONTINUE; | |
466 | } | |
467 | /* Fall through */ | |
468 | ||
469 | case TLS_ST_SW_CERT_REQ: | |
470 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
471 | return WRITE_TRAN_CONTINUE; | |
472 | ||
473 | case TLS_ST_SW_SRVR_DONE: | |
474 | return WRITE_TRAN_FINISHED; | |
475 | ||
476 | case TLS_ST_SR_FINISHED: | |
477 | if (s->hit) { | |
478 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 479 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
480 | return WRITE_TRAN_CONTINUE; |
481 | } else if (s->tlsext_ticket_expected) { | |
482 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
483 | } else { | |
484 | st->hand_state = TLS_ST_SW_CHANGE; | |
485 | } | |
486 | return WRITE_TRAN_CONTINUE; | |
487 | ||
488 | case TLS_ST_SW_SESSION_TICKET: | |
489 | st->hand_state = TLS_ST_SW_CHANGE; | |
490 | return WRITE_TRAN_CONTINUE; | |
491 | ||
492 | case TLS_ST_SW_CHANGE: | |
493 | st->hand_state = TLS_ST_SW_FINISHED; | |
494 | return WRITE_TRAN_CONTINUE; | |
495 | ||
496 | case TLS_ST_SW_FINISHED: | |
497 | if (s->hit) { | |
498 | return WRITE_TRAN_FINISHED; | |
499 | } | |
500 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 501 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
502 | return WRITE_TRAN_CONTINUE; |
503 | ||
504 | default: | |
505 | /* Shouldn't happen */ | |
506 | return WRITE_TRAN_ERROR; | |
507 | } | |
508 | } | |
509 | ||
510 | /* | |
511 | * Perform any pre work that needs to be done prior to sending a message from | |
512 | * the server to the client. | |
513 | */ | |
8481f583 | 514 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) |
61ae935a | 515 | { |
d6f1a6e9 | 516 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
517 | |
518 | switch(st->hand_state) { | |
519 | case TLS_ST_SW_HELLO_REQ: | |
520 | s->shutdown = 0; | |
521 | if (SSL_IS_DTLS(s)) | |
522 | dtls1_clear_record_buffer(s); | |
523 | break; | |
524 | ||
525 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
526 | s->shutdown = 0; | |
527 | if (SSL_IS_DTLS(s)) { | |
528 | dtls1_clear_record_buffer(s); | |
529 | /* We don't buffer this message so don't use the timer */ | |
530 | st->use_timer = 0; | |
531 | } | |
532 | break; | |
533 | ||
534 | case TLS_ST_SW_SRVR_HELLO: | |
535 | if (SSL_IS_DTLS(s)) { | |
536 | /* | |
537 | * Messages we write from now on should be bufferred and | |
538 | * retransmitted if necessary, so we need to use the timer now | |
539 | */ | |
540 | st->use_timer = 1; | |
541 | } | |
542 | break; | |
543 | ||
544 | case TLS_ST_SW_SRVR_DONE: | |
545 | #ifndef OPENSSL_NO_SCTP | |
546 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
547 | return dtls_wait_for_dry(s); | |
548 | #endif | |
549 | return WORK_FINISHED_CONTINUE; | |
550 | ||
551 | case TLS_ST_SW_SESSION_TICKET: | |
552 | if (SSL_IS_DTLS(s)) { | |
553 | /* | |
554 | * We're into the last flight. We don't retransmit the last flight | |
555 | * unless we need to, so we don't use the timer | |
556 | */ | |
557 | st->use_timer = 0; | |
558 | } | |
559 | break; | |
560 | ||
561 | case TLS_ST_SW_CHANGE: | |
562 | s->session->cipher = s->s3->tmp.new_cipher; | |
563 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 564 | ossl_statem_set_error(s); |
61ae935a MC |
565 | return WORK_ERROR; |
566 | } | |
567 | if (SSL_IS_DTLS(s)) { | |
568 | /* | |
569 | * We're into the last flight. We don't retransmit the last flight | |
570 | * unless we need to, so we don't use the timer. This might have | |
571 | * already been set to 0 if we sent a NewSessionTicket message, | |
572 | * but we'll set it again here in case we didn't. | |
573 | */ | |
574 | st->use_timer = 0; | |
575 | } | |
576 | return WORK_FINISHED_CONTINUE; | |
577 | ||
578 | case TLS_ST_OK: | |
579 | return tls_finish_handshake(s, wst); | |
580 | ||
581 | default: | |
582 | /* No pre work to be done */ | |
583 | break; | |
584 | } | |
585 | ||
586 | return WORK_FINISHED_CONTINUE; | |
587 | } | |
588 | ||
589 | /* | |
590 | * Perform any work that needs to be done after sending a message from the | |
591 | * server to the client. | |
592 | */ | |
8481f583 | 593 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) |
61ae935a | 594 | { |
d6f1a6e9 | 595 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
596 | |
597 | s->init_num = 0; | |
598 | ||
599 | switch(st->hand_state) { | |
600 | case TLS_ST_SW_HELLO_REQ: | |
601 | if (statem_flush(s) != 1) | |
602 | return WORK_MORE_A; | |
603 | ssl3_init_finished_mac(s); | |
604 | break; | |
605 | ||
606 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
607 | if (statem_flush(s) != 1) | |
608 | return WORK_MORE_A; | |
609 | /* HelloVerifyRequest resets Finished MAC */ | |
610 | if (s->version != DTLS1_BAD_VER) | |
611 | ssl3_init_finished_mac(s); | |
612 | /* | |
613 | * The next message should be another ClientHello which we need to | |
614 | * treat like it was the first packet | |
615 | */ | |
616 | s->first_packet = 1; | |
617 | break; | |
618 | ||
619 | case TLS_ST_SW_SRVR_HELLO: | |
620 | #ifndef OPENSSL_NO_SCTP | |
621 | if (SSL_IS_DTLS(s) && s->hit) { | |
622 | unsigned char sctpauthkey[64]; | |
623 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
624 | ||
625 | /* | |
626 | * Add new shared key for SCTP-Auth, will be ignored if no | |
627 | * SCTP used. | |
628 | */ | |
141eb8c6 MC |
629 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
630 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
631 | |
632 | if (SSL_export_keying_material(s, sctpauthkey, | |
633 | sizeof(sctpauthkey), labelbuffer, | |
634 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 635 | ossl_statem_set_error(s); |
61ae935a MC |
636 | return WORK_ERROR; |
637 | } | |
638 | ||
639 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
640 | sizeof(sctpauthkey), sctpauthkey); | |
641 | } | |
642 | #endif | |
643 | break; | |
644 | ||
645 | case TLS_ST_SW_CHANGE: | |
646 | #ifndef OPENSSL_NO_SCTP | |
647 | if (SSL_IS_DTLS(s) && !s->hit) { | |
648 | /* | |
649 | * Change to new shared key of SCTP-Auth, will be ignored if | |
650 | * no SCTP used. | |
651 | */ | |
652 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
653 | 0, NULL); | |
654 | } | |
655 | #endif | |
656 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
657 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { | |
fe3a3291 | 658 | ossl_statem_set_error(s); |
61ae935a MC |
659 | return WORK_ERROR; |
660 | } | |
661 | ||
662 | if (SSL_IS_DTLS(s)) | |
663 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
664 | break; | |
665 | ||
666 | case TLS_ST_SW_SRVR_DONE: | |
667 | if (statem_flush(s) != 1) | |
668 | return WORK_MORE_A; | |
669 | break; | |
670 | ||
671 | case TLS_ST_SW_FINISHED: | |
672 | if (statem_flush(s) != 1) | |
673 | return WORK_MORE_A; | |
674 | #ifndef OPENSSL_NO_SCTP | |
675 | if (SSL_IS_DTLS(s) && s->hit) { | |
676 | /* | |
677 | * Change to new shared key of SCTP-Auth, will be ignored if | |
678 | * no SCTP used. | |
679 | */ | |
680 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
681 | 0, NULL); | |
682 | } | |
683 | #endif | |
684 | break; | |
685 | ||
686 | default: | |
687 | /* No post work to be done */ | |
688 | break; | |
689 | } | |
690 | ||
691 | return WORK_FINISHED_CONTINUE; | |
692 | } | |
693 | ||
694 | /* | |
695 | * Construct a message to be sent from the server to the client. | |
696 | * | |
697 | * Valid return values are: | |
698 | * 1: Success | |
699 | * 0: Error | |
700 | */ | |
8481f583 | 701 | int ossl_statem_server_construct_message(SSL *s) |
61ae935a | 702 | { |
d6f1a6e9 | 703 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
704 | |
705 | switch(st->hand_state) { | |
706 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
707 | return dtls_construct_hello_verify_request(s); | |
708 | ||
709 | case TLS_ST_SW_HELLO_REQ: | |
710 | return tls_construct_hello_request(s); | |
711 | ||
712 | case TLS_ST_SW_SRVR_HELLO: | |
713 | return tls_construct_server_hello(s); | |
714 | ||
715 | case TLS_ST_SW_CERT: | |
716 | return tls_construct_server_certificate(s); | |
717 | ||
718 | case TLS_ST_SW_KEY_EXCH: | |
719 | return tls_construct_server_key_exchange(s); | |
720 | ||
721 | case TLS_ST_SW_CERT_REQ: | |
722 | return tls_construct_certificate_request(s); | |
723 | ||
724 | case TLS_ST_SW_SRVR_DONE: | |
725 | return tls_construct_server_done(s); | |
726 | ||
727 | case TLS_ST_SW_SESSION_TICKET: | |
728 | return tls_construct_new_session_ticket(s); | |
729 | ||
730 | case TLS_ST_SW_CERT_STATUS: | |
731 | return tls_construct_cert_status(s); | |
732 | ||
733 | case TLS_ST_SW_CHANGE: | |
734 | if (SSL_IS_DTLS(s)) | |
735 | return dtls_construct_change_cipher_spec(s); | |
736 | else | |
737 | return tls_construct_change_cipher_spec(s); | |
738 | ||
739 | case TLS_ST_SW_FINISHED: | |
740 | return tls_construct_finished(s, | |
741 | s->method-> | |
742 | ssl3_enc->server_finished_label, | |
743 | s->method-> | |
744 | ssl3_enc->server_finished_label_len); | |
745 | ||
746 | default: | |
747 | /* Shouldn't happen */ | |
748 | break; | |
749 | } | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 | |
755 | #define NEXT_PROTO_MAX_LENGTH 514 | |
756 | ||
757 | /* | |
758 | * Returns the maximum allowed length for the current message that we are | |
759 | * reading. Excludes the message header. | |
760 | */ | |
8481f583 | 761 | unsigned long ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 762 | { |
d6f1a6e9 | 763 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
764 | |
765 | switch(st->hand_state) { | |
766 | case TLS_ST_SR_CLNT_HELLO: | |
767 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
768 | ||
769 | case TLS_ST_SR_CERT: | |
770 | return s->max_cert_list; | |
771 | ||
772 | case TLS_ST_SR_KEY_EXCH: | |
773 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
774 | ||
775 | case TLS_ST_SR_CERT_VRFY: | |
776 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
777 | ||
778 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
779 | case TLS_ST_SR_NEXT_PROTO: | |
780 | return NEXT_PROTO_MAX_LENGTH; | |
781 | #endif | |
782 | ||
783 | case TLS_ST_SR_CHANGE: | |
784 | return CCS_MAX_LENGTH; | |
785 | ||
786 | case TLS_ST_SR_FINISHED: | |
787 | return FINISHED_MAX_LENGTH; | |
788 | ||
789 | default: | |
790 | /* Shouldn't happen */ | |
791 | break; | |
792 | } | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Process a message that the server has received from the client. | |
799 | */ | |
8481f583 | 800 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 801 | { |
d6f1a6e9 | 802 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
803 | |
804 | switch(st->hand_state) { | |
805 | case TLS_ST_SR_CLNT_HELLO: | |
806 | return tls_process_client_hello(s, pkt); | |
807 | ||
808 | case TLS_ST_SR_CERT: | |
809 | return tls_process_client_certificate(s, pkt); | |
810 | ||
811 | case TLS_ST_SR_KEY_EXCH: | |
812 | return tls_process_client_key_exchange(s, pkt); | |
813 | ||
814 | case TLS_ST_SR_CERT_VRFY: | |
815 | return tls_process_cert_verify(s, pkt); | |
816 | ||
817 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
818 | case TLS_ST_SR_NEXT_PROTO: | |
819 | return tls_process_next_proto(s, pkt); | |
820 | #endif | |
821 | ||
822 | case TLS_ST_SR_CHANGE: | |
823 | return tls_process_change_cipher_spec(s, pkt); | |
824 | ||
825 | case TLS_ST_SR_FINISHED: | |
826 | return tls_process_finished(s, pkt); | |
827 | ||
828 | default: | |
829 | /* Shouldn't happen */ | |
830 | break; | |
831 | } | |
832 | ||
833 | return MSG_PROCESS_ERROR; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Perform any further processing required following the receipt of a message | |
838 | * from the client | |
839 | */ | |
8481f583 | 840 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 841 | { |
d6f1a6e9 | 842 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
843 | |
844 | switch(st->hand_state) { | |
845 | case TLS_ST_SR_CLNT_HELLO: | |
846 | return tls_post_process_client_hello(s, wst); | |
847 | ||
848 | case TLS_ST_SR_KEY_EXCH: | |
849 | return tls_post_process_client_key_exchange(s, wst); | |
850 | ||
851 | case TLS_ST_SR_CERT_VRFY: | |
852 | #ifndef OPENSSL_NO_SCTP | |
853 | if ( /* Is this SCTP? */ | |
854 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
855 | /* Are we renegotiating? */ | |
856 | && s->renegotiate | |
857 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
858 | s->s3->in_read_app_data = 2; | |
859 | s->rwstate = SSL_READING; | |
860 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
861 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 862 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
863 | return WORK_MORE_A; |
864 | } else { | |
d99b0691 | 865 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
866 | } |
867 | #endif | |
868 | return WORK_FINISHED_CONTINUE; | |
869 | ||
61ae935a MC |
870 | default: |
871 | break; | |
872 | } | |
873 | ||
874 | /* Shouldn't happen */ | |
875 | return WORK_ERROR; | |
876 | } | |
877 | ||
edc032b5 | 878 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 879 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
880 | { |
881 | int ret = SSL_ERROR_NONE; | |
882 | ||
883 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
884 | ||
885 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
886 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
887 | if (s->srp_ctx.login == NULL) { | |
888 | /* | |
889 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
890 | * login name | |
891 | */ | |
892 | ret = SSL3_AL_FATAL; | |
893 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
894 | } else { | |
895 | ret = SSL_srp_server_param_with_username(s, al); | |
896 | } | |
897 | } | |
898 | return ret; | |
899 | } | |
edc032b5 BL |
900 | #endif |
901 | ||
e27f234a MC |
902 | int tls_construct_hello_request(SSL *s) |
903 | { | |
904 | if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) { | |
905 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 906 | ossl_statem_set_error(s); |
e27f234a MC |
907 | return 0; |
908 | } | |
909 | ||
910 | return 1; | |
911 | } | |
912 | ||
8ba708e5 MC |
913 | unsigned int dtls_raw_hello_verify_request(unsigned char *buf, |
914 | unsigned char *cookie, | |
915 | unsigned char cookie_len) | |
916 | { | |
917 | unsigned int msg_len; | |
918 | unsigned char *p; | |
919 | ||
920 | p = buf; | |
921 | /* Always use DTLS 1.0 version: see RFC 6347 */ | |
922 | *(p++) = DTLS1_VERSION >> 8; | |
923 | *(p++) = DTLS1_VERSION & 0xFF; | |
924 | ||
925 | *(p++) = (unsigned char)cookie_len; | |
926 | memcpy(p, cookie, cookie_len); | |
927 | p += cookie_len; | |
928 | msg_len = p - buf; | |
929 | ||
930 | return msg_len; | |
931 | } | |
932 | ||
933 | int dtls_construct_hello_verify_request(SSL *s) | |
934 | { | |
935 | unsigned int len; | |
936 | unsigned char *buf; | |
937 | ||
938 | buf = (unsigned char *)s->init_buf->data; | |
939 | ||
940 | if (s->ctx->app_gen_cookie_cb == NULL || | |
941 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
942 | &(s->d1->cookie_len)) == 0 || | |
943 | s->d1->cookie_len > 255) { | |
f0659bdb | 944 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 945 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
fe3a3291 | 946 | ossl_statem_set_error(s); |
8ba708e5 MC |
947 | return 0; |
948 | } | |
949 | ||
950 | len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH], | |
951 | s->d1->cookie, s->d1->cookie_len); | |
952 | ||
953 | dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, | |
954 | len); | |
955 | len += DTLS1_HM_HEADER_LENGTH; | |
956 | ||
957 | /* number of bytes to write */ | |
958 | s->init_num = len; | |
959 | s->init_off = 0; | |
960 | ||
961 | return 1; | |
962 | } | |
963 | ||
be3583fa | 964 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
965 | { |
966 | int i, al = SSL_AD_INTERNAL_ERROR; | |
967 | unsigned int j, complen = 0; | |
968 | unsigned long id; | |
969 | SSL_CIPHER *c; | |
970 | #ifndef OPENSSL_NO_COMP | |
971 | SSL_COMP *comp = NULL; | |
972 | #endif | |
973 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
974 | int protverr = 1; | |
975 | /* |cookie| will only be initialized for DTLS. */ | |
73999b62 | 976 | PACKET session_id, cipher_suites, compression, extensions, cookie; |
e27f234a MC |
977 | int is_v2_record; |
978 | ||
b3e2272c EK |
979 | is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
980 | ||
bbafa47b | 981 | PACKET_null_init(&cookie); |
32ec4153 | 982 | /* First lets get s->client_version set correctly */ |
b3e2272c | 983 | if (is_v2_record) { |
9ceb2426 MC |
984 | unsigned int version; |
985 | unsigned int mt; | |
32ec4153 MC |
986 | /*- |
987 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
988 | * header is sent directly on the wire, not wrapped as a TLS | |
989 | * record. Our record layer just processes the message length and passes | |
990 | * the rest right through. Its format is: | |
991 | * Byte Content | |
992 | * 0-1 msg_length - decoded by the record layer | |
993 | * 2 msg_type - s->init_msg points here | |
994 | * 3-4 version | |
995 | * 5-6 cipher_spec_length | |
996 | * 7-8 session_id_length | |
997 | * 9-10 challenge_length | |
998 | * ... ... | |
999 | */ | |
1000 | ||
73999b62 | 1001 | if (!PACKET_get_1(pkt, &mt) |
9ceb2426 | 1002 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
1003 | /* |
1004 | * Should never happen. We should have tested this in the record | |
1005 | * layer in order to have determined that this is a SSLv2 record | |
1006 | * in the first place | |
1007 | */ | |
e27f234a | 1008 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 1009 | goto err; |
32ec4153 MC |
1010 | } |
1011 | ||
73999b62 | 1012 | if (!PACKET_get_net_2(pkt, &version)) { |
9ceb2426 | 1013 | /* No protocol version supplied! */ |
e27f234a | 1014 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
9ceb2426 MC |
1015 | goto err; |
1016 | } | |
1017 | if (version == 0x0002) { | |
32ec4153 | 1018 | /* This is real SSLv2. We don't support it. */ |
e27f234a | 1019 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1020 | goto err; |
9ceb2426 | 1021 | } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) { |
32ec4153 | 1022 | /* SSLv3/TLS */ |
9ceb2426 | 1023 | s->client_version = version; |
32ec4153 MC |
1024 | } else { |
1025 | /* No idea what protocol this is */ | |
e27f234a | 1026 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 MC |
1027 | goto err; |
1028 | } | |
1029 | } else { | |
1030 | /* | |
9ceb2426 MC |
1031 | * use version from inside client hello, not from record header (may |
1032 | * differ: see RFC 2246, Appendix E, second paragraph) | |
32ec4153 | 1033 | */ |
73999b62 | 1034 | if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) { |
32ec4153 | 1035 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 1036 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); |
32ec4153 MC |
1037 | goto f_err; |
1038 | } | |
5e9f0eeb MC |
1039 | } |
1040 | ||
32ec4153 MC |
1041 | /* Do SSL/TLS version negotiation if applicable */ |
1042 | if (!SSL_IS_DTLS(s)) { | |
1043 | if (s->version != TLS_ANY_VERSION) { | |
b2ce0337 | 1044 | if (s->client_version >= s->version) { |
32ec4153 MC |
1045 | protverr = 0; |
1046 | } | |
b2ce0337 | 1047 | } else if (s->client_version >= SSL3_VERSION) { |
32ec4153 MC |
1048 | switch(s->client_version) { |
1049 | default: | |
1050 | case TLS1_2_VERSION: | |
1051 | if(!(s->options & SSL_OP_NO_TLSv1_2)) { | |
1052 | s->version = TLS1_2_VERSION; | |
1053 | s->method = TLSv1_2_server_method(); | |
1054 | protverr = 0; | |
1055 | break; | |
1056 | } | |
1057 | /* Deliberately fall through */ | |
1058 | case TLS1_1_VERSION: | |
1059 | if(!(s->options & SSL_OP_NO_TLSv1_1)) { | |
1060 | s->version = TLS1_1_VERSION; | |
1061 | s->method = TLSv1_1_server_method(); | |
1062 | protverr = 0; | |
1063 | break; | |
1064 | } | |
1065 | /* Deliberately fall through */ | |
1066 | case TLS1_VERSION: | |
1067 | if(!(s->options & SSL_OP_NO_TLSv1)) { | |
1068 | s->version = TLS1_VERSION; | |
1069 | s->method = TLSv1_server_method(); | |
1070 | protverr = 0; | |
1071 | break; | |
1072 | } | |
1073 | /* Deliberately fall through */ | |
1074 | case SSL3_VERSION: | |
b2ce0337 | 1075 | #ifndef OPENSSL_NO_SSL3 |
32ec4153 MC |
1076 | if(!(s->options & SSL_OP_NO_SSLv3)) { |
1077 | s->version = SSL3_VERSION; | |
1078 | s->method = SSLv3_server_method(); | |
1079 | protverr = 0; | |
1080 | break; | |
1081 | } | |
b2ce0337 MC |
1082 | #else |
1083 | break; | |
1084 | #endif | |
32ec4153 MC |
1085 | } |
1086 | } | |
b2ce0337 MC |
1087 | } else if (s->client_version <= s->version |
1088 | || s->method->version == DTLS_ANY_VERSION) { | |
32ec4153 MC |
1089 | /* |
1090 | * For DTLS we just check versions are potentially compatible. Version | |
1091 | * negotiation comes later. | |
1092 | */ | |
1093 | protverr = 0; | |
1094 | } | |
1095 | ||
1096 | if (protverr) { | |
e27f234a | 1097 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1098 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
1099 | /* |
1100 | * similar to ssl3_get_record, send alert using remote version | |
1101 | * number | |
1102 | */ | |
1103 | s->version = s->client_version; | |
1104 | } | |
1105 | al = SSL_AD_PROTOCOL_VERSION; | |
1106 | goto f_err; | |
1107 | } | |
1108 | ||
b3e2272c EK |
1109 | /* Parse the message and load client random. */ |
1110 | if (is_v2_record) { | |
32ec4153 MC |
1111 | /* |
1112 | * Handle an SSLv2 backwards compatible ClientHello | |
1113 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1114 | * Real SSLv2 is not supported, and is rejected above. | |
1115 | */ | |
ec30e856 | 1116 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1117 | PACKET challenge; |
0f113f3e | 1118 | |
73999b62 MC |
1119 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1120 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1121 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1122 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1123 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1124 | al = SSL_AD_DECODE_ERROR; |
1125 | goto f_err; | |
5e9f0eeb | 1126 | } |
0f113f3e | 1127 | |
73999b62 MC |
1128 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1129 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1130 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1131 | /* No extensions. */ |
73999b62 | 1132 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1133 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1134 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1135 | al = SSL_AD_DECODE_ERROR; |
1136 | goto f_err; | |
1137 | } | |
1138 | ||
32ec4153 | 1139 | /* Load the client random */ |
b3e2272c EK |
1140 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1141 | challenge_len; | |
32ec4153 | 1142 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1143 | if (!PACKET_copy_bytes(&challenge, |
1144 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
1145 | challenge_len, challenge_len)) { | |
f0659bdb | 1146 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1147 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1148 | goto f_err; |
1149 | } | |
b3e2272c EK |
1150 | |
1151 | PACKET_null_init(&compression); | |
1152 | PACKET_null_init(&extensions); | |
0f113f3e | 1153 | } else { |
b3e2272c | 1154 | /* Regular ClientHello. */ |
73999b62 MC |
1155 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1156 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1157 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1158 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1159 | goto f_err; |
1160 | } | |
32ec4153 | 1161 | |
b3e2272c | 1162 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1163 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1164 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1165 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1166 | goto f_err; |
1167 | } | |
b3e2272c EK |
1168 | /* |
1169 | * If we require cookies and this ClientHello doesn't contain one, | |
1170 | * just return since we do not want to allocate any memory yet. | |
1171 | * So check cookie length... | |
1172 | */ | |
1173 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1174 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1175 | return 1; |
b3e2272c | 1176 | } |
5e9f0eeb | 1177 | } |
0f113f3e | 1178 | |
73999b62 MC |
1179 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1180 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c | 1181 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1182 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
b3e2272c EK |
1183 | goto f_err; |
1184 | } | |
1185 | /* Could be empty. */ | |
73999b62 | 1186 | extensions = *pkt; |
b3e2272c EK |
1187 | } |
1188 | ||
1189 | s->hit = 0; | |
1190 | ||
1191 | /* | |
1192 | * We don't allow resumption in a backwards compatible ClientHello. | |
1193 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1194 | * | |
1195 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1196 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1197 | * ignore resumption requests with flag | |
1198 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1199 | * than a change to default behavior so that applications relying on | |
1200 | * this for security won't even compile against older library versions). | |
1201 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1202 | * request renegotiation but not a new session (s->new_session remains | |
1203 | * unset): for servers, this essentially just means that the | |
1204 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1205 | * ignored. | |
1206 | */ | |
1207 | if (is_v2_record || | |
1208 | (s->new_session && | |
1209 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1210 | if (!ssl_get_new_session(s, 1)) | |
1211 | goto err; | |
1212 | } else { | |
1213 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1214 | /* |
b3e2272c EK |
1215 | * Only resume if the session's version matches the negotiated |
1216 | * version. | |
1217 | * RFC 5246 does not provide much useful advice on resumption | |
1218 | * with a different protocol version. It doesn't forbid it but | |
1219 | * the sanity of such behaviour would be questionable. | |
1220 | * In practice, clients do not accept a version mismatch and | |
1221 | * will abort the handshake with an error. | |
0f113f3e | 1222 | */ |
b3e2272c EK |
1223 | if (i == 1 && s->version == s->session->ssl_version) { |
1224 | /* previous session */ | |
1225 | s->hit = 1; | |
1226 | } else if (i == -1) { | |
1227 | goto err; | |
32ec4153 | 1228 | } else { |
b3e2272c EK |
1229 | /* i == 0 */ |
1230 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1231 | goto err; |
0f113f3e | 1232 | } |
b3e2272c | 1233 | } |
0f113f3e | 1234 | |
b3e2272c | 1235 | if (SSL_IS_DTLS(s)) { |
e27f234a | 1236 | /* Empty cookie was already handled above by returning early. */ |
31011544 | 1237 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { |
b3e2272c | 1238 | if (s->ctx->app_verify_cookie_cb != NULL) { |
31011544 EK |
1239 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), |
1240 | PACKET_remaining(&cookie)) == 0) { | |
32ec4153 | 1241 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1242 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1243 | SSL_R_COOKIE_MISMATCH); |
32ec4153 | 1244 | goto f_err; |
31011544 | 1245 | /* else cookie verification succeeded */ |
32ec4153 | 1246 | } |
b3e2272c | 1247 | /* default verification */ |
31011544 EK |
1248 | } else if (!PACKET_equal(&cookie, s->d1->cookie, |
1249 | s->d1->cookie_len)) { | |
b3e2272c | 1250 | al = SSL_AD_HANDSHAKE_FAILURE; |
f0659bdb | 1251 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); |
b3e2272c | 1252 | goto f_err; |
32ec4153 | 1253 | } |
e27f234a | 1254 | s->d1->cookie_verified = 1; |
0f113f3e | 1255 | } |
b3e2272c EK |
1256 | if (s->method->version == DTLS_ANY_VERSION) { |
1257 | /* Select version to use */ | |
1258 | if (s->client_version <= DTLS1_2_VERSION && | |
1259 | !(s->options & SSL_OP_NO_DTLSv1_2)) { | |
1260 | s->version = DTLS1_2_VERSION; | |
1261 | s->method = DTLSv1_2_server_method(); | |
1262 | } else if (tls1_suiteb(s)) { | |
f0659bdb | 1263 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c EK |
1264 | SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); |
1265 | s->version = s->client_version; | |
1266 | al = SSL_AD_PROTOCOL_VERSION; | |
1267 | goto f_err; | |
1268 | } else if (s->client_version <= DTLS1_VERSION && | |
1269 | !(s->options & SSL_OP_NO_DTLSv1)) { | |
1270 | s->version = DTLS1_VERSION; | |
1271 | s->method = DTLSv1_server_method(); | |
1272 | } else { | |
f0659bdb | 1273 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c EK |
1274 | SSL_R_WRONG_VERSION_NUMBER); |
1275 | s->version = s->client_version; | |
1276 | al = SSL_AD_PROTOCOL_VERSION; | |
1277 | goto f_err; | |
1278 | } | |
1279 | s->session->ssl_version = s->version; | |
32ec4153 | 1280 | } |
b3e2272c | 1281 | } |
3ae91cfb | 1282 | |
38a3cbfb EK |
1283 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1284 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1285 | goto f_err; |
1286 | } | |
5e9f0eeb | 1287 | |
b3e2272c EK |
1288 | /* If it is a hit, check that the cipher is in the list */ |
1289 | if (s->hit) { | |
1290 | j = 0; | |
1291 | id = s->session->cipher->id; | |
d02b48c6 | 1292 | |
413c4f45 | 1293 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1294 | fprintf(stderr, "client sent %d ciphers\n", |
1295 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1296 | #endif |
b3e2272c EK |
1297 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1298 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1299 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1300 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1301 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1302 | #endif |
b3e2272c EK |
1303 | if (c->id == id) { |
1304 | j = 1; | |
1305 | break; | |
32ec4153 | 1306 | } |
0f113f3e | 1307 | } |
b3e2272c | 1308 | if (j == 0) { |
ec30e856 | 1309 | /* |
b3e2272c EK |
1310 | * we need to have the cipher in the cipher list if we are asked |
1311 | * to reuse it | |
ec30e856 | 1312 | */ |
b3e2272c | 1313 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1314 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1315 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1316 | goto f_err; |
1317 | } | |
b3e2272c | 1318 | } |
9ceb2426 | 1319 | |
b3e2272c EK |
1320 | complen = PACKET_remaining(&compression); |
1321 | for (j = 0; j < complen; j++) { | |
1322 | if (PACKET_data(&compression)[j] == 0) | |
1323 | break; | |
0f113f3e | 1324 | } |
32ec4153 | 1325 | |
b3e2272c EK |
1326 | if (j >= complen) { |
1327 | /* no compress */ | |
1328 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1329 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1330 | goto f_err; |
1331 | } | |
1332 | ||
0f113f3e MC |
1333 | /* TLS extensions */ |
1334 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1335 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
f0659bdb | 1336 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
0f113f3e MC |
1337 | goto err; |
1338 | } | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Check if we want to use external pre-shared secret for this handshake | |
1343 | * for not reused session only. We need to generate server_random before | |
1344 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1345 | * processing to use it in key derivation. | |
1346 | */ | |
1347 | { | |
1348 | unsigned char *pos; | |
1349 | pos = s->s3->server_random; | |
1350 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1351 | goto f_err; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
1356 | SSL_CIPHER *pref_cipher = NULL; | |
1357 | ||
1358 | s->session->master_key_length = sizeof(s->session->master_key); | |
1359 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1360 | &s->session->master_key_length, ciphers, | |
1361 | &pref_cipher, | |
1362 | s->tls_session_secret_cb_arg)) { | |
1363 | s->hit = 1; | |
1364 | s->session->ciphers = ciphers; | |
1365 | s->session->verify_result = X509_V_OK; | |
1366 | ||
1367 | ciphers = NULL; | |
1368 | ||
1369 | /* check if some cipher was preferred by call back */ | |
1370 | pref_cipher = | |
1371 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1372 | s-> | |
1373 | session->ciphers, | |
1374 | SSL_get_ciphers | |
1375 | (s)); | |
1376 | if (pref_cipher == NULL) { | |
1377 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1378 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1379 | goto f_err; |
1380 | } | |
1381 | ||
1382 | s->session->cipher = pref_cipher; | |
25aaa98a | 1383 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1384 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1385 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1386 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1387 | } | |
1388 | } | |
58ece833 | 1389 | |
0f113f3e MC |
1390 | /* |
1391 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1392 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1393 | * algorithms from the client, starting at q. |
1394 | */ | |
1395 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1396 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1397 | /* This only happens if we have a cache hit */ |
1398 | if (s->session->compress_meth != 0) { | |
1399 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1400 | unsigned int k; |
0f113f3e MC |
1401 | /* Perform sanity checks on resumed compression algorithm */ |
1402 | /* Can't disable compression */ | |
1403 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1404 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1405 | SSL_R_INCONSISTENT_COMPRESSION); |
1406 | goto f_err; | |
1407 | } | |
1408 | /* Look for resumed compression method */ | |
1409 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1410 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1411 | if (comp_id == comp->id) { | |
1412 | s->s3->tmp.new_compression = comp; | |
1413 | break; | |
1414 | } | |
1415 | } | |
1416 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1417 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1418 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1419 | goto f_err; | |
1420 | } | |
1421 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1422 | for (k = 0; k < complen; k++) { |
ec30e856 | 1423 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1424 | break; |
1425 | } | |
9ceb2426 | 1426 | if (k >= complen) { |
0f113f3e | 1427 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1428 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1429 | SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING); |
1430 | goto f_err; | |
1431 | } | |
1432 | } else if (s->hit) | |
1433 | comp = NULL; | |
1434 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1435 | /* See if we have a match */ |
9ceb2426 MC |
1436 | int m, nn, v, done = 0; |
1437 | unsigned int o; | |
0f113f3e MC |
1438 | |
1439 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1440 | for (m = 0; m < nn; m++) { | |
1441 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1442 | v = comp->id; | |
b2ce0337 | 1443 | for (o = 0; o < complen; o++) { |
ec30e856 | 1444 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1445 | done = 1; |
1446 | break; | |
1447 | } | |
1448 | } | |
1449 | if (done) | |
1450 | break; | |
1451 | } | |
1452 | if (done) | |
1453 | s->s3->tmp.new_compression = comp; | |
1454 | else | |
1455 | comp = NULL; | |
1456 | } | |
e6f418bc | 1457 | #else |
0f113f3e MC |
1458 | /* |
1459 | * If compression is disabled we'd better not try to resume a session | |
1460 | * using compression. | |
1461 | */ | |
1462 | if (s->session->compress_meth != 0) { | |
e27f234a | 1463 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1464 | goto f_err; |
1465 | } | |
09b6c2ef | 1466 | #endif |
413c4f45 | 1467 | |
0f113f3e MC |
1468 | /* |
1469 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1470 | */ | |
d02b48c6 | 1471 | |
0f113f3e | 1472 | if (!s->hit) { |
09b6c2ef | 1473 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1474 | s->session->compress_meth = 0; |
09b6c2ef | 1475 | #else |
0f113f3e | 1476 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1477 | #endif |
25aaa98a | 1478 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1479 | s->session->ciphers = ciphers; |
1480 | if (ciphers == NULL) { | |
3ae91cfb | 1481 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1482 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1483 | goto f_err; |
1484 | } | |
1485 | ciphers = NULL; | |
1486 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1487 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1488 | goto err; |
1489 | } | |
e27f234a MC |
1490 | } |
1491 | ||
1492 | sk_SSL_CIPHER_free(ciphers); | |
1493 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1494 | f_err: | |
1495 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1496 | err: | |
fe3a3291 | 1497 | ossl_statem_set_error(s); |
e27f234a MC |
1498 | |
1499 | sk_SSL_CIPHER_free(ciphers); | |
1500 | return MSG_PROCESS_ERROR; | |
1501 | ||
1502 | } | |
1503 | ||
be3583fa | 1504 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1505 | { |
d13dd4be | 1506 | int al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1507 | SSL_CIPHER *cipher; |
1508 | ||
1509 | if (wst == WORK_MORE_A) { | |
1510 | if (!s->hit) { | |
1511 | /* Let cert callback update server certificates if required */ | |
1512 | if (s->cert->cert_cb) { | |
1513 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1514 | if (rv == 0) { | |
1515 | al = SSL_AD_INTERNAL_ERROR; | |
1516 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1517 | goto f_err; | |
1518 | } | |
1519 | if (rv < 0) { | |
1520 | s->rwstate = SSL_X509_LOOKUP; | |
1521 | return WORK_MORE_A; | |
1522 | } | |
1523 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1524 | } |
e27f234a MC |
1525 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1526 | ||
1527 | if (cipher == NULL) { | |
e27f234a MC |
1528 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
1529 | goto f_err; | |
0f113f3e | 1530 | } |
e27f234a MC |
1531 | s->s3->tmp.new_cipher = cipher; |
1532 | /* check whether we should disable session resumption */ | |
1533 | if (s->not_resumable_session_cb != NULL) | |
1534 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1535 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1536 | if (s->session->not_resumable) | |
1537 | /* do not send a session ticket */ | |
1538 | s->tlsext_ticket_expected = 0; | |
1539 | } else { | |
1540 | /* Session-id reuse */ | |
1541 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1542 | } |
0f113f3e | 1543 | |
28f4580c | 1544 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1545 | if (!ssl3_digest_cached_records(s, 0)) { |
1546 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1547 | goto f_err; |
d13dd4be | 1548 | } |
0f113f3e | 1549 | } |
0f113f3e | 1550 | |
e27f234a MC |
1551 | /*- |
1552 | * we now have the following setup. | |
1553 | * client_random | |
1554 | * cipher_list - our prefered list of ciphers | |
1555 | * ciphers - the clients prefered list of ciphers | |
1556 | * compression - basically ignored right now | |
1557 | * ssl version is set - sslv3 | |
1558 | * s->session - The ssl session has been setup. | |
1559 | * s->hit - session reuse flag | |
1560 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1561 | */ | |
0f113f3e | 1562 | |
e27f234a MC |
1563 | /* Handles TLS extensions that we couldn't check earlier */ |
1564 | if (s->version >= SSL3_VERSION) { | |
1565 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
d13dd4be MC |
1566 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1567 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1568 | goto f_err; |
1569 | } | |
1570 | } | |
0f113f3e | 1571 | |
e27f234a MC |
1572 | wst = WORK_MORE_B; |
1573 | } | |
1574 | #ifndef OPENSSL_NO_SRP | |
1575 | if (wst == WORK_MORE_B) { | |
1576 | int ret; | |
1577 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1578 | /* | |
1579 | * callback indicates further work to be done | |
1580 | */ | |
1581 | s->rwstate = SSL_X509_LOOKUP; | |
1582 | return WORK_MORE_B; | |
1583 | } | |
1584 | if (ret != SSL_ERROR_NONE) { | |
1585 | /* | |
1586 | * This is not really an error but the only means to for | |
1587 | * a client to detect whether srp is supported. | |
1588 | */ | |
1589 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1590 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1591 | SSL_R_CLIENTHELLO_TLSEXT); | |
1592 | goto f_err; | |
0f113f3e MC |
1593 | } |
1594 | } | |
e27f234a MC |
1595 | #endif |
1596 | s->renegotiate = 2; | |
0f113f3e | 1597 | |
e27f234a | 1598 | return WORK_FINISHED_STOP; |
0f113f3e | 1599 | f_err: |
e27f234a | 1600 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1601 | ossl_statem_set_error(s); |
e27f234a MC |
1602 | return WORK_ERROR; |
1603 | } | |
1604 | ||
e27f234a | 1605 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1606 | { |
1607 | unsigned char *buf; | |
1608 | unsigned char *p, *d; | |
1609 | int i, sl; | |
1610 | int al = 0; | |
1611 | unsigned long l; | |
1612 | ||
e27f234a | 1613 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1614 | |
e27f234a MC |
1615 | /* Do the message type and length last */ |
1616 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1617 | |
e27f234a MC |
1618 | *(p++) = s->version >> 8; |
1619 | *(p++) = s->version & 0xff; | |
0f113f3e | 1620 | |
e27f234a MC |
1621 | /* |
1622 | * Random stuff. Filling of the server_random takes place in | |
1623 | * tls_process_client_hello() | |
1624 | */ | |
1625 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1626 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1627 | |
e27f234a MC |
1628 | /*- |
1629 | * There are several cases for the session ID to send | |
1630 | * back in the server hello: | |
1631 | * - For session reuse from the session cache, | |
1632 | * we send back the old session ID. | |
1633 | * - If stateless session reuse (using a session ticket) | |
1634 | * is successful, we send back the client's "session ID" | |
1635 | * (which doesn't actually identify the session). | |
1636 | * - If it is a new session, we send back the new | |
1637 | * session ID. | |
1638 | * - However, if we want the new session to be single-use, | |
1639 | * we send back a 0-length session ID. | |
1640 | * s->hit is non-zero in either case of session reuse, | |
1641 | * so the following won't overwrite an ID that we're supposed | |
1642 | * to send back. | |
1643 | */ | |
1644 | if (s->session->not_resumable || | |
1645 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1646 | && !s->hit)) | |
1647 | s->session->session_id_length = 0; | |
1648 | ||
1649 | sl = s->session->session_id_length; | |
1650 | if (sl > (int)sizeof(s->session->session_id)) { | |
1651 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1652 | ossl_statem_set_error(s); |
e27f234a MC |
1653 | return 0; |
1654 | } | |
1655 | *(p++) = sl; | |
1656 | memcpy(p, s->session->session_id, sl); | |
1657 | p += sl; | |
0f113f3e | 1658 | |
e27f234a MC |
1659 | /* put the cipher */ |
1660 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1661 | p += i; | |
0f113f3e | 1662 | |
e27f234a | 1663 | /* put the compression method */ |
09b6c2ef | 1664 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1665 | *(p++) = 0; |
09b6c2ef | 1666 | #else |
e27f234a MC |
1667 | if (s->s3->tmp.new_compression == NULL) |
1668 | *(p++) = 0; | |
1669 | else | |
1670 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1671 | #endif |
e481f9b9 | 1672 | |
e27f234a MC |
1673 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1674 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1675 | ossl_statem_set_error(s); |
e27f234a MC |
1676 | return 0; |
1677 | } | |
1678 | if ((p = | |
1679 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1680 | &al)) == NULL) { | |
1681 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1682 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1683 | ossl_statem_set_error(s); |
e27f234a MC |
1684 | return 0; |
1685 | } | |
e481f9b9 | 1686 | |
e27f234a MC |
1687 | /* do the header */ |
1688 | l = (p - d); | |
1689 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1690 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1691 | ossl_statem_set_error(s); |
e27f234a | 1692 | return 0; |
0f113f3e | 1693 | } |
d02b48c6 | 1694 | |
e27f234a | 1695 | return 1; |
0f113f3e | 1696 | } |
d02b48c6 | 1697 | |
e27f234a MC |
1698 | int tls_construct_server_done(SSL *s) |
1699 | { | |
1700 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1701 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1702 | ossl_statem_set_error(s); |
e27f234a MC |
1703 | return 0; |
1704 | } | |
1705 | ||
1706 | if (!s->s3->tmp.cert_request) { | |
1707 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1708 | ossl_statem_set_error(s); |
e27f234a MC |
1709 | } |
1710 | } | |
1711 | ||
1712 | return 1; | |
1713 | } | |
1714 | ||
e27f234a | 1715 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1716 | { |
bc36ee62 | 1717 | #ifndef OPENSSL_NO_DH |
0f113f3e | 1718 | DH *dh = NULL, *dhp; |
ea262260 | 1719 | #endif |
10bf4fc2 | 1720 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1721 | unsigned char *encodedPoint = NULL; |
1722 | int encodedlen = 0; | |
1723 | int curve_id = 0; | |
1724 | BN_CTX *bn_ctx = NULL; | |
d02b48c6 | 1725 | #endif |
0f113f3e MC |
1726 | EVP_PKEY *pkey; |
1727 | const EVP_MD *md = NULL; | |
1728 | unsigned char *p, *d; | |
1729 | int al, i; | |
1730 | unsigned long type; | |
1731 | int n; | |
1732 | CERT *cert; | |
1733 | BIGNUM *r[4]; | |
1734 | int nr[4], kn; | |
1735 | BUF_MEM *buf; | |
1736 | EVP_MD_CTX md_ctx; | |
1737 | ||
1738 | EVP_MD_CTX_init(&md_ctx); | |
0f113f3e | 1739 | |
e27f234a MC |
1740 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
1741 | cert = s->cert; | |
1742 | ||
1743 | buf = s->init_buf; | |
0f113f3e | 1744 | |
e27f234a MC |
1745 | r[0] = r[1] = r[2] = r[3] = NULL; |
1746 | n = 0; | |
85269210 | 1747 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1748 | if (type & SSL_PSK) { |
1749 | /* | |
1750 | * reserve size for record length and PSK identity hint | |
1751 | */ | |
1752 | n += 2; | |
1753 | if (s->cert->psk_identity_hint) | |
1754 | n += strlen(s->cert->psk_identity_hint); | |
1755 | } | |
1756 | /* Plain PSK or RSAPSK nothing to do */ | |
1757 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1758 | } else | |
85269210 | 1759 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1760 | #ifndef OPENSSL_NO_DH |
e27f234a MC |
1761 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
1762 | if (s->cert->dh_tmp_auto) { | |
1763 | dhp = ssl_get_auto_dh(s); | |
0f113f3e | 1764 | if (dhp == NULL) { |
e27f234a MC |
1765 | al = SSL_AD_INTERNAL_ERROR; |
1766 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1767 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1768 | goto f_err; |
0f113f3e | 1769 | } |
e27f234a MC |
1770 | } else |
1771 | dhp = cert->dh_tmp; | |
1772 | if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) | |
361a1191 | 1773 | dhp = s->cert->dh_tmp_cb(s, 0, 1024); |
e27f234a MC |
1774 | if (dhp == NULL) { |
1775 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1776 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1777 | SSL_R_MISSING_TMP_DH_KEY); | |
1778 | goto f_err; | |
1779 | } | |
1780 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
1781 | DH_security_bits(dhp), 0, dhp)) { | |
1782 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1783 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1784 | SSL_R_DH_KEY_TOO_SMALL); | |
1785 | goto f_err; | |
1786 | } | |
1787 | if (s->s3->tmp.dh != NULL) { | |
1788 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1789 | ERR_R_INTERNAL_ERROR); | |
1790 | goto err; | |
1791 | } | |
0f113f3e | 1792 | |
e27f234a MC |
1793 | if (s->cert->dh_tmp_auto) |
1794 | dh = dhp; | |
1795 | else if ((dh = DHparams_dup(dhp)) == NULL) { | |
1796 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1797 | goto err; | |
1798 | } | |
1799 | ||
1800 | s->s3->tmp.dh = dh; | |
1801 | if ((dhp->pub_key == NULL || | |
1802 | dhp->priv_key == NULL || | |
1803 | (s->options & SSL_OP_SINGLE_DH_USE))) { | |
1804 | if (!DH_generate_key(dh)) { | |
1805 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
0f113f3e MC |
1806 | goto err; |
1807 | } | |
e27f234a MC |
1808 | } else { |
1809 | dh->pub_key = BN_dup(dhp->pub_key); | |
1810 | dh->priv_key = BN_dup(dhp->priv_key); | |
1811 | if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { | |
1812 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1813 | goto err; | |
0f113f3e | 1814 | } |
e27f234a MC |
1815 | } |
1816 | r[0] = dh->p; | |
1817 | r[1] = dh->g; | |
1818 | r[2] = dh->pub_key; | |
1819 | } else | |
d02b48c6 | 1820 | #endif |
10bf4fc2 | 1821 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1822 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1823 | const EC_GROUP *group; | |
fe6ef247 | 1824 | EC_KEY *ecdh = NULL; |
0f113f3e | 1825 | |
fe6ef247 KR |
1826 | /* Get NID of appropriate shared curve */ |
1827 | int nid = tls1_shared_curve(s, -2); | |
1828 | if (nid != NID_undef) | |
1829 | ecdh = EC_KEY_new_by_curve_name(nid); | |
1830 | if (ecdh == NULL) { | |
e27f234a MC |
1831 | al = SSL_AD_HANDSHAKE_FAILURE; |
1832 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1833 | SSL_R_MISSING_TMP_ECDH_KEY); | |
1834 | goto f_err; | |
1835 | } | |
1836 | ||
1837 | if (s->s3->tmp.ecdh != NULL) { | |
1838 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1839 | ERR_R_INTERNAL_ERROR); | |
1840 | goto err; | |
1841 | } | |
1842 | ||
e27f234a MC |
1843 | s->s3->tmp.ecdh = ecdh; |
1844 | if ((EC_KEY_get0_public_key(ecdh) == NULL) || | |
1845 | (EC_KEY_get0_private_key(ecdh) == NULL) || | |
1846 | (s->options & SSL_OP_SINGLE_ECDH_USE)) { | |
1847 | if (!EC_KEY_generate_key(ecdh)) { | |
1848 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1849 | ERR_R_ECDH_LIB); | |
0f113f3e MC |
1850 | goto err; |
1851 | } | |
e27f234a | 1852 | } |
0f113f3e | 1853 | |
e27f234a MC |
1854 | if (((group = EC_KEY_get0_group(ecdh)) == NULL) || |
1855 | (EC_KEY_get0_public_key(ecdh) == NULL) || | |
1856 | (EC_KEY_get0_private_key(ecdh) == NULL)) { | |
1857 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1858 | goto err; | |
1859 | } | |
0f113f3e | 1860 | |
e27f234a MC |
1861 | /* |
1862 | * XXX: For now, we only support ephemeral ECDH keys over named | |
1863 | * (not generic) curves. For supported named curves, curve_id is | |
1864 | * non-zero. | |
1865 | */ | |
1866 | if ((curve_id = | |
1867 | tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) | |
1868 | == 0) { | |
1869 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1870 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1871 | goto err; | |
1872 | } | |
0f113f3e | 1873 | |
e27f234a MC |
1874 | /* |
1875 | * Encode the public key. First check the size of encoding and | |
1876 | * allocate memory accordingly. | |
1877 | */ | |
1878 | encodedlen = EC_POINT_point2oct(group, | |
1879 | EC_KEY_get0_public_key(ecdh), | |
1880 | POINT_CONVERSION_UNCOMPRESSED, | |
1881 | NULL, 0, NULL); | |
1882 | ||
1883 | encodedPoint = (unsigned char *) | |
1884 | OPENSSL_malloc(encodedlen * sizeof(unsigned char)); | |
1885 | bn_ctx = BN_CTX_new(); | |
1886 | if ((encodedPoint == NULL) || (bn_ctx == NULL)) { | |
1887 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1888 | ERR_R_MALLOC_FAILURE); | |
1889 | goto err; | |
1890 | } | |
0f113f3e | 1891 | |
e27f234a MC |
1892 | encodedlen = EC_POINT_point2oct(group, |
1893 | EC_KEY_get0_public_key(ecdh), | |
1894 | POINT_CONVERSION_UNCOMPRESSED, | |
1895 | encodedPoint, encodedlen, bn_ctx); | |
0f113f3e | 1896 | |
e27f234a MC |
1897 | if (encodedlen == 0) { |
1898 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1899 | goto err; | |
1900 | } | |
0f113f3e | 1901 | |
e27f234a MC |
1902 | BN_CTX_free(bn_ctx); |
1903 | bn_ctx = NULL; | |
0f113f3e | 1904 | |
e27f234a MC |
1905 | /* |
1906 | * XXX: For now, we only support named (not generic) curves in | |
1907 | * ECDH ephemeral key exchanges. In this situation, we need four | |
1908 | * additional bytes to encode the entire ServerECDHParams | |
1909 | * structure. | |
1910 | */ | |
1911 | n += 4 + encodedlen; | |
0f113f3e | 1912 | |
e27f234a MC |
1913 | /* |
1914 | * We'll generate the serverKeyExchange message explicitly so we | |
1915 | * can set these to NULLs | |
1916 | */ | |
1917 | r[0] = NULL; | |
1918 | r[1] = NULL; | |
1919 | r[2] = NULL; | |
1920 | r[3] = NULL; | |
1921 | } else | |
10bf4fc2 | 1922 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1923 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1924 | if (type & SSL_kSRP) { |
1925 | if ((s->srp_ctx.N == NULL) || | |
1926 | (s->srp_ctx.g == NULL) || | |
1927 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1928 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1929 | SSL_R_MISSING_SRP_PARAM); | |
1930 | goto err; | |
0f113f3e | 1931 | } |
e27f234a MC |
1932 | r[0] = s->srp_ctx.N; |
1933 | r[1] = s->srp_ctx.g; | |
1934 | r[2] = s->srp_ctx.s; | |
1935 | r[3] = s->srp_ctx.B; | |
1936 | } else | |
1937 | #endif | |
1938 | { | |
1939 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1940 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1941 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1942 | goto f_err; | |
1943 | } | |
1944 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
1945 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 1946 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1947 | if ((i == 2) && (type & SSL_kSRP)) |
1948 | n += 1 + nr[i]; | |
1949 | else | |
edc032b5 | 1950 | #endif |
e27f234a MC |
1951 | n += 2 + nr[i]; |
1952 | } | |
0f113f3e | 1953 | |
e27f234a MC |
1954 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
1955 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
1956 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1957 | == NULL) { | |
1958 | al = SSL_AD_DECODE_ERROR; | |
1959 | goto f_err; | |
0f113f3e | 1960 | } |
e27f234a MC |
1961 | kn = EVP_PKEY_size(pkey); |
1962 | } else { | |
1963 | pkey = NULL; | |
1964 | kn = 0; | |
1965 | } | |
0f113f3e | 1966 | |
e27f234a MC |
1967 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
1968 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
1969 | goto err; | |
1970 | } | |
1971 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1972 | |
85269210 | 1973 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1974 | if (type & SSL_PSK) { |
1975 | /* copy PSK identity hint */ | |
1976 | if (s->cert->psk_identity_hint) { | |
1977 | s2n(strlen(s->cert->psk_identity_hint), p); | |
1978 | strncpy((char *)p, s->cert->psk_identity_hint, | |
1979 | strlen(s->cert->psk_identity_hint)); | |
1980 | p += strlen(s->cert->psk_identity_hint); | |
1981 | } else { | |
1982 | s2n(0, p); | |
85269210 | 1983 | } |
e27f234a | 1984 | } |
85269210 DSH |
1985 | #endif |
1986 | ||
e27f234a | 1987 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 1988 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1989 | if ((i == 2) && (type & SSL_kSRP)) { |
1990 | *p = nr[i]; | |
1991 | p++; | |
1992 | } else | |
edc032b5 | 1993 | #endif |
e27f234a MC |
1994 | s2n(nr[i], p); |
1995 | BN_bn2bin(r[i], p); | |
1996 | p += nr[i]; | |
1997 | } | |
d02b48c6 | 1998 | |
10bf4fc2 | 1999 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
2000 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2001 | /* | |
2002 | * XXX: For now, we only support named (not generic) curves. In | |
2003 | * this situation, the serverKeyExchange message has: [1 byte | |
2004 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
2005 | * point], followed by the actual encoded point itself | |
2006 | */ | |
2007 | *p = NAMED_CURVE_TYPE; | |
2008 | p += 1; | |
2009 | *p = 0; | |
2010 | p += 1; | |
2011 | *p = curve_id; | |
2012 | p += 1; | |
2013 | *p = encodedlen; | |
2014 | p += 1; | |
2015 | memcpy(p, encodedPoint, encodedlen); | |
2016 | OPENSSL_free(encodedPoint); | |
2017 | encodedPoint = NULL; | |
2018 | p += encodedlen; | |
2019 | } | |
ea262260 BM |
2020 | #endif |
2021 | ||
e27f234a MC |
2022 | /* not anonymous */ |
2023 | if (pkey != NULL) { | |
2024 | /* | |
2025 | * n is the length of the params, they start at &(d[4]) and p | |
2026 | * points to the space at the end. | |
2027 | */ | |
e27f234a MC |
2028 | if (md) { |
2029 | /* send signature algorithm */ | |
2030 | if (SSL_USE_SIGALGS(s)) { | |
2031 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
2032 | /* Should never happen */ | |
2033 | al = SSL_AD_INTERNAL_ERROR; | |
2034 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2035 | ERR_R_INTERNAL_ERROR); | |
2036 | goto f_err; | |
0f113f3e | 2037 | } |
e27f234a MC |
2038 | p += 2; |
2039 | } | |
a2f9200f | 2040 | #ifdef SSL_DEBUG |
e27f234a | 2041 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 2042 | #endif |
5f3d93e4 MC |
2043 | if (EVP_SignInit_ex(&md_ctx, md, NULL) <= 0 |
2044 | || EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), | |
2045 | SSL3_RANDOM_SIZE) <= 0 | |
2046 | || EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), | |
2047 | SSL3_RANDOM_SIZE) <= 0 | |
2048 | || EVP_SignUpdate(&md_ctx, d, n) <= 0 | |
2049 | || EVP_SignFinal(&md_ctx, &(p[2]), | |
2050 | (unsigned int *)&i, pkey) <= 0) { | |
e27f234a | 2051 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); |
5f3d93e4 MC |
2052 | al = SSL_AD_INTERNAL_ERROR; |
2053 | goto f_err; | |
0f113f3e | 2054 | } |
e27f234a MC |
2055 | s2n(i, p); |
2056 | n += i + 2; | |
2057 | if (SSL_USE_SIGALGS(s)) | |
2058 | n += 2; | |
2059 | } else { | |
2060 | /* Is this error check actually needed? */ | |
77d514c5 | 2061 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
2062 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2063 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
2064 | goto f_err; |
2065 | } | |
0f113f3e MC |
2066 | } |
2067 | ||
e27f234a MC |
2068 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
2069 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2070 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2071 | goto f_err; | |
2072 | } | |
2073 | ||
0f113f3e | 2074 | EVP_MD_CTX_cleanup(&md_ctx); |
e27f234a | 2075 | return 1; |
0f113f3e MC |
2076 | f_err: |
2077 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2078 | err: | |
556efe79 | 2079 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 2080 | OPENSSL_free(encodedPoint); |
0f113f3e | 2081 | BN_CTX_free(bn_ctx); |
ea262260 | 2082 | #endif |
0f113f3e | 2083 | EVP_MD_CTX_cleanup(&md_ctx); |
fe3a3291 | 2084 | ossl_statem_set_error(s); |
e27f234a | 2085 | return 0; |
0f113f3e | 2086 | } |
d02b48c6 | 2087 | |
e27f234a | 2088 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
2089 | { |
2090 | unsigned char *p, *d; | |
2091 | int i, j, nl, off, n; | |
2092 | STACK_OF(X509_NAME) *sk = NULL; | |
2093 | X509_NAME *name; | |
2094 | BUF_MEM *buf; | |
2095 | ||
e27f234a | 2096 | buf = s->init_buf; |
0f113f3e | 2097 | |
e27f234a | 2098 | d = p = ssl_handshake_start(s); |
0f113f3e | 2099 | |
e27f234a MC |
2100 | /* get the list of acceptable cert types */ |
2101 | p++; | |
2102 | n = ssl3_get_req_cert_type(s, p); | |
2103 | d[0] = n; | |
2104 | p += n; | |
2105 | n++; | |
0f113f3e | 2106 | |
e27f234a MC |
2107 | if (SSL_USE_SIGALGS(s)) { |
2108 | const unsigned char *psigs; | |
2109 | unsigned char *etmp = p; | |
2110 | nl = tls12_get_psigalgs(s, &psigs); | |
2111 | /* Skip over length for now */ | |
0f113f3e | 2112 | p += 2; |
e27f234a MC |
2113 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
2114 | /* Now fill in length */ | |
2115 | s2n(nl, etmp); | |
2116 | p += nl; | |
2117 | n += nl + 2; | |
2118 | } | |
0f113f3e | 2119 | |
e27f234a MC |
2120 | off = n; |
2121 | p += 2; | |
2122 | n += 2; | |
2123 | ||
2124 | sk = SSL_get_client_CA_list(s); | |
2125 | nl = 0; | |
2126 | if (sk != NULL) { | |
2127 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
2128 | name = sk_X509_NAME_value(sk, i); | |
2129 | j = i2d_X509_NAME(name, NULL); | |
2130 | if (!BUF_MEM_grow_clean | |
2131 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
2132 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2133 | ERR_R_BUF_LIB); | |
2134 | goto err; | |
0f113f3e | 2135 | } |
e27f234a MC |
2136 | p = ssl_handshake_start(s) + n; |
2137 | s2n(j, p); | |
2138 | i2d_X509_NAME(name, &p); | |
2139 | n += 2 + j; | |
2140 | nl += 2 + j; | |
0f113f3e | 2141 | } |
e27f234a MC |
2142 | } |
2143 | /* else no CA names */ | |
2144 | p = ssl_handshake_start(s) + off; | |
2145 | s2n(nl, p); | |
d02b48c6 | 2146 | |
e27f234a MC |
2147 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2148 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2149 | goto err; | |
0f113f3e | 2150 | } |
d02b48c6 | 2151 | |
e27f234a MC |
2152 | s->s3->tmp.cert_request = 1; |
2153 | ||
2154 | return 1; | |
0f113f3e | 2155 | err: |
fe3a3291 | 2156 | ossl_statem_set_error(s); |
e27f234a | 2157 | return 0; |
0f113f3e | 2158 | } |
d02b48c6 | 2159 | |
be3583fa | 2160 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
e27f234a MC |
2161 | { |
2162 | int al; | |
2163 | unsigned int i; | |
0f113f3e | 2164 | unsigned long alg_k; |
bc36ee62 | 2165 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
2166 | RSA *rsa = NULL; |
2167 | EVP_PKEY *pkey = NULL; | |
79df9d62 | 2168 | #endif |
bc36ee62 | 2169 | #ifndef OPENSSL_NO_DH |
0f113f3e MC |
2170 | BIGNUM *pub = NULL; |
2171 | DH *dh_srvr, *dh_clnt = NULL; | |
58964a49 | 2172 | #endif |
556efe79 | 2173 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2174 | EC_KEY *srvr_ecdh = NULL; |
2175 | EVP_PKEY *clnt_pub_pkey = NULL; | |
2176 | EC_POINT *clnt_ecpoint = NULL; | |
2177 | BN_CTX *bn_ctx = NULL; | |
ea262260 | 2178 | #endif |
73999b62 | 2179 | PACKET enc_premaster; |
20ca916d | 2180 | unsigned char *data, *rsa_decrypt = NULL; |
ea262260 | 2181 | |
0f113f3e | 2182 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
d02b48c6 | 2183 | |
85269210 DSH |
2184 | #ifndef OPENSSL_NO_PSK |
2185 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2186 | if (alg_k & SSL_PSK) { | |
2187 | unsigned char psk[PSK_MAX_PSK_LEN]; | |
2188 | size_t psklen; | |
73999b62 | 2189 | PACKET psk_identity; |
efcdbcbe | 2190 | |
73999b62 | 2191 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
85269210 | 2192 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2193 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2194 | goto f_err; |
2195 | } | |
6d41fc80 | 2196 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { |
85269210 | 2197 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2198 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2199 | SSL_R_DATA_LENGTH_TOO_LONG); |
2200 | goto f_err; | |
2201 | } | |
2202 | if (s->psk_server_callback == NULL) { | |
2203 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2204 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2205 | SSL_R_PSK_NO_SERVER_CB); |
2206 | goto f_err; | |
2207 | } | |
2208 | ||
6d41fc80 | 2209 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
f0659bdb | 2210 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 | 2211 | al = SSL_AD_INTERNAL_ERROR; |
efcdbcbe MC |
2212 | goto f_err; |
2213 | } | |
85269210 DSH |
2214 | |
2215 | psklen = s->psk_server_callback(s, s->session->psk_identity, | |
2216 | psk, sizeof(psk)); | |
2217 | ||
2218 | if (psklen > PSK_MAX_PSK_LEN) { | |
2219 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2220 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2221 | goto f_err; |
2222 | } else if (psklen == 0) { | |
2223 | /* | |
2224 | * PSK related to the given identity not found | |
2225 | */ | |
e27f234a | 2226 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2227 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2228 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2229 | goto f_err; | |
2230 | } | |
2231 | ||
2232 | OPENSSL_free(s->s3->tmp.psk); | |
2233 | s->s3->tmp.psk = BUF_memdup(psk, psklen); | |
2234 | OPENSSL_cleanse(psk, psklen); | |
2235 | ||
2236 | if (s->s3->tmp.psk == NULL) { | |
2237 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2238 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
85269210 DSH |
2239 | goto f_err; |
2240 | } | |
2241 | ||
2242 | s->s3->tmp.psklen = psklen; | |
85269210 DSH |
2243 | } |
2244 | if (alg_k & SSL_kPSK) { | |
2245 | /* Identity extracted earlier: should be nothing left */ | |
73999b62 | 2246 | if (PACKET_remaining(pkt) != 0) { |
85269210 | 2247 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2248 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2249 | goto f_err; |
2250 | } | |
2251 | /* PSK handled by ssl_generate_master_secret */ | |
2252 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
2253 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2254 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2255 | goto f_err; |
2256 | } | |
2257 | } else | |
2258 | #endif | |
bc36ee62 | 2259 | #ifndef OPENSSL_NO_RSA |
85269210 | 2260 | if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
0f113f3e MC |
2261 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2262 | int decrypt_len; | |
2263 | unsigned char decrypt_good, version_good; | |
2264 | size_t j; | |
2265 | ||
2266 | /* FIX THIS UP EAY EAY EAY EAY */ | |
361a1191 KR |
2267 | pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; |
2268 | if ((pkey == NULL) || | |
2269 | (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { | |
2270 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2271 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2272 | SSL_R_MISSING_RSA_CERTIFICATE); | |
2273 | goto f_err; | |
0f113f3e | 2274 | } |
361a1191 | 2275 | rsa = pkey->pkey.rsa; |
0f113f3e | 2276 | |
20ca916d EK |
2277 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ |
2278 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
73999b62 | 2279 | enc_premaster = *pkt; |
20ca916d | 2280 | } else { |
73999b62 MC |
2281 | PACKET orig = *pkt; |
2282 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) | |
2283 | || PACKET_remaining(pkt) != 0) { | |
20ca916d EK |
2284 | /* Try SSLv3 behaviour for TLS. */ |
2285 | if (s->options & SSL_OP_TLS_D5_BUG) { | |
2286 | enc_premaster = orig; | |
2287 | } else { | |
0f113f3e | 2288 | al = SSL_AD_DECODE_ERROR; |
f0659bdb MC |
2289 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2290 | SSL_R_LENGTH_MISMATCH); | |
0f113f3e | 2291 | goto f_err; |
efcdbcbe MC |
2292 | } |
2293 | } | |
0f113f3e MC |
2294 | } |
2295 | ||
2296 | /* | |
20ca916d EK |
2297 | * We want to be sure that the plaintext buffer size makes it safe to |
2298 | * iterate over the entire size of a premaster secret | |
2299 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2300 | * their ciphertext cannot accommodate a premaster secret anyway. | |
0f113f3e | 2301 | */ |
20ca916d EK |
2302 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { |
2303 | al = SSL_AD_INTERNAL_ERROR; | |
f0659bdb | 2304 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
20ca916d | 2305 | RSA_R_KEY_SIZE_TOO_SMALL); |
0f113f3e MC |
2306 | goto f_err; |
2307 | } | |
2308 | ||
20ca916d EK |
2309 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2310 | if (rsa_decrypt == NULL) { | |
efcdbcbe | 2311 | al = SSL_AD_INTERNAL_ERROR; |
f0659bdb | 2312 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2313 | goto f_err; |
2314 | } | |
20ca916d | 2315 | |
0f113f3e MC |
2316 | /* |
2317 | * We must not leak whether a decryption failure occurs because of | |
2318 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2319 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2320 | * generates a random premaster secret for the case that the decrypt | |
2321 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2322 | */ | |
2323 | ||
266483d2 | 2324 | if (RAND_bytes(rand_premaster_secret, |
20ca916d | 2325 | sizeof(rand_premaster_secret)) <= 0) { |
0f113f3e | 2326 | goto err; |
20ca916d EK |
2327 | } |
2328 | ||
2329 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2330 | PACKET_data(&enc_premaster), | |
2331 | rsa_decrypt, rsa, RSA_PKCS1_PADDING); | |
0f113f3e MC |
2332 | ERR_clear_error(); |
2333 | ||
2334 | /* | |
2335 | * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will | |
2336 | * be 0xff if so and zero otherwise. | |
2337 | */ | |
2338 | decrypt_good = | |
2339 | constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); | |
2340 | ||
2341 | /* | |
2342 | * If the version in the decrypted pre-master secret is correct then | |
2343 | * version_good will be 0xff, otherwise it'll be zero. The | |
2344 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2345 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2346 | * check as a "bad version oracle". Thus version checks are done in | |
2347 | * constant time and are treated like any other decryption error. | |
2348 | */ | |
2349 | version_good = | |
20ca916d EK |
2350 | constant_time_eq_8(rsa_decrypt[0], |
2351 | (unsigned)(s->client_version >> 8)); | |
0f113f3e | 2352 | version_good &= |
20ca916d EK |
2353 | constant_time_eq_8(rsa_decrypt[1], |
2354 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e MC |
2355 | |
2356 | /* | |
2357 | * The premaster secret must contain the same version number as the | |
2358 | * ClientHello to detect version rollback attacks (strangely, the | |
2359 | * protocol does not offer such protection for DH ciphersuites). | |
2360 | * However, buggy clients exist that send the negotiated protocol | |
2361 | * version instead if the server does not support the requested | |
2362 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2363 | * clients. | |
2364 | */ | |
2365 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2366 | unsigned char workaround_good; | |
2367 | workaround_good = | |
20ca916d | 2368 | constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8)); |
0f113f3e | 2369 | workaround_good &= |
20ca916d EK |
2370 | constant_time_eq_8(rsa_decrypt[1], |
2371 | (unsigned)(s->version & 0xff)); | |
0f113f3e MC |
2372 | version_good |= workaround_good; |
2373 | } | |
2374 | ||
2375 | /* | |
2376 | * Both decryption and version must be good for decrypt_good to | |
2377 | * remain non-zero (0xff). | |
2378 | */ | |
2379 | decrypt_good &= version_good; | |
2380 | ||
2381 | /* | |
2382 | * Now copy rand_premaster_secret over from p using | |
2383 | * decrypt_good_mask. If decryption failed, then p does not | |
2384 | * contain valid plaintext, however, a check above guarantees | |
2385 | * it is still sufficiently large to read from. | |
2386 | */ | |
2387 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
20ca916d EK |
2388 | rsa_decrypt[j] = |
2389 | constant_time_select_8(decrypt_good, rsa_decrypt[j], | |
2390 | rand_premaster_secret[j]); | |
0f113f3e MC |
2391 | } |
2392 | ||
20ca916d EK |
2393 | if (!ssl_generate_master_secret(s, rsa_decrypt, |
2394 | sizeof(rand_premaster_secret), 0)) { | |
69f68237 | 2395 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2396 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2397 | goto f_err; |
2398 | } | |
20ca916d EK |
2399 | OPENSSL_free(rsa_decrypt); |
2400 | rsa_decrypt = NULL; | |
0f113f3e | 2401 | } else |
4c5fac4a | 2402 | #endif |
bc36ee62 | 2403 | #ifndef OPENSSL_NO_DH |
85269210 | 2404 | if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) { |
0f113f3e MC |
2405 | int idx = -1; |
2406 | EVP_PKEY *skey = NULL; | |
73999b62 | 2407 | PACKET bookmark = *pkt; |
efcdbcbe MC |
2408 | unsigned char shared[(OPENSSL_DH_MAX_MODULUS_BITS + 7) / 8]; |
2409 | ||
73999b62 | 2410 | if (!PACKET_get_net_2(pkt, &i)) { |
85269210 | 2411 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
d3cc5e61 | 2412 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2413 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
d3cc5e61 MC |
2414 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2415 | goto f_err; | |
2416 | } | |
0f113f3e | 2417 | i = 0; |
d3cc5e61 | 2418 | } |
73999b62 | 2419 | if (PACKET_remaining(pkt) != i) { |
0f113f3e | 2420 | if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) { |
e27f234a | 2421 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2422 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2423 | goto err; | |
2424 | } else { | |
73999b62 MC |
2425 | *pkt = bookmark; |
2426 | i = PACKET_remaining(pkt); | |
0f113f3e MC |
2427 | } |
2428 | } | |
2429 | if (alg_k & SSL_kDHr) | |
2430 | idx = SSL_PKEY_DH_RSA; | |
2431 | else if (alg_k & SSL_kDHd) | |
2432 | idx = SSL_PKEY_DH_DSA; | |
2433 | if (idx >= 0) { | |
2434 | skey = s->cert->pkeys[idx].privatekey; | |
2435 | if ((skey == NULL) || | |
2436 | (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) { | |
2437 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2438 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2439 | SSL_R_MISSING_RSA_CERTIFICATE); |
2440 | goto f_err; | |
2441 | } | |
2442 | dh_srvr = skey->pkey.dh; | |
2443 | } else if (s->s3->tmp.dh == NULL) { | |
2444 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2445 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2446 | SSL_R_MISSING_TMP_DH_KEY); |
2447 | goto f_err; | |
2448 | } else | |
2449 | dh_srvr = s->s3->tmp.dh; | |
2450 | ||
73999b62 | 2451 | if (PACKET_remaining(pkt) == 0L) { |
0f113f3e MC |
2452 | /* Get pubkey from cert */ |
2453 | EVP_PKEY *clkey = X509_get_pubkey(s->session->peer); | |
2454 | if (clkey) { | |
2455 | if (EVP_PKEY_cmp_parameters(clkey, skey) == 1) | |
2456 | dh_clnt = EVP_PKEY_get1_DH(clkey); | |
2457 | } | |
2458 | if (dh_clnt == NULL) { | |
2459 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2460 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2461 | SSL_R_MISSING_TMP_DH_KEY); |
2462 | goto f_err; | |
2463 | } | |
2464 | EVP_PKEY_free(clkey); | |
2465 | pub = dh_clnt->pub_key; | |
efcdbcbe | 2466 | } else { |
73999b62 | 2467 | if (!PACKET_get_bytes(pkt, &data, i)) { |
efcdbcbe MC |
2468 | /* We already checked we have enough data */ |
2469 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2470 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2471 | ERR_R_INTERNAL_ERROR); |
2472 | goto f_err; | |
2473 | } | |
2474 | pub = BN_bin2bn(data, i, NULL); | |
2475 | } | |
0f113f3e | 2476 | if (pub == NULL) { |
e27f234a | 2477 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); |
0f113f3e MC |
2478 | goto err; |
2479 | } | |
2480 | ||
efcdbcbe | 2481 | i = DH_compute_key(shared, pub, dh_srvr); |
0f113f3e MC |
2482 | |
2483 | if (i <= 0) { | |
e27f234a | 2484 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
0f113f3e MC |
2485 | BN_clear_free(pub); |
2486 | goto err; | |
2487 | } | |
2488 | ||
2489 | DH_free(s->s3->tmp.dh); | |
2490 | s->s3->tmp.dh = NULL; | |
2491 | if (dh_clnt) | |
2492 | DH_free(dh_clnt); | |
2493 | else | |
2494 | BN_clear_free(pub); | |
2495 | pub = NULL; | |
efcdbcbe | 2496 | if (!ssl_generate_master_secret(s, shared, i, 0)) { |
69f68237 | 2497 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2498 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2499 | goto f_err; |
2500 | } | |
e27f234a | 2501 | if (dh_clnt) { |
a71a4966 | 2502 | s->statem.no_cert_verify = 1; |
e27f234a MC |
2503 | return MSG_PROCESS_CONTINUE_PROCESSING; |
2504 | } | |
0f113f3e | 2505 | } else |
d02b48c6 | 2506 | #endif |
ea262260 | 2507 | |
556efe79 | 2508 | #ifndef OPENSSL_NO_EC |
85269210 | 2509 | if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) { |
0f113f3e MC |
2510 | int field_size = 0; |
2511 | const EC_KEY *tkey; | |
2512 | const EC_GROUP *group; | |
2513 | const BIGNUM *priv_key; | |
efcdbcbe | 2514 | unsigned char *shared; |
0f113f3e MC |
2515 | |
2516 | /* initialize structures for server's ECDH key pair */ | |
2517 | if ((srvr_ecdh = EC_KEY_new()) == NULL) { | |
e27f234a | 2518 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2519 | goto err; |
2520 | } | |
2521 | ||
2522 | /* Let's get server private key and group information */ | |
2523 | if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { | |
2524 | /* use the certificate */ | |
2525 | tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec; | |
2526 | } else { | |
2527 | /* | |
2528 | * use the ephermeral values we saved when generating the | |
2529 | * ServerKeyExchange msg. | |
2530 | */ | |
2531 | tkey = s->s3->tmp.ecdh; | |
2532 | } | |
2533 | ||
2534 | group = EC_KEY_get0_group(tkey); | |
2535 | priv_key = EC_KEY_get0_private_key(tkey); | |
2536 | ||
2537 | if (!EC_KEY_set_group(srvr_ecdh, group) || | |
2538 | !EC_KEY_set_private_key(srvr_ecdh, priv_key)) { | |
e27f234a | 2539 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2540 | goto err; |
2541 | } | |
2542 | ||
2543 | /* Let's get client's public key */ | |
2544 | if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) { | |
e27f234a | 2545 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2546 | goto err; |
2547 | } | |
2548 | ||
73999b62 | 2549 | if (PACKET_remaining(pkt) == 0L) { |
0f113f3e MC |
2550 | /* Client Publickey was in Client Certificate */ |
2551 | ||
85269210 | 2552 | if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
0f113f3e | 2553 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2554 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2555 | SSL_R_MISSING_TMP_ECDH_KEY); |
2556 | goto f_err; | |
2557 | } | |
2558 | if (((clnt_pub_pkey = X509_get_pubkey(s->session->peer)) | |
2559 | == NULL) || (clnt_pub_pkey->type != EVP_PKEY_EC)) { | |
2560 | /* | |
2561 | * XXX: For now, we do not support client authentication | |
2562 | * using ECDH certificates so this branch (n == 0L) of the | |
2563 | * code is never executed. When that support is added, we | |
2564 | * ought to ensure the key received in the certificate is | |
2565 | * authorized for key agreement. ECDH_compute_key implicitly | |
2566 | * checks that the two ECDH shares are for the same group. | |
2567 | */ | |
2568 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2569 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2570 | SSL_R_UNABLE_TO_DECODE_ECDH_CERTS); |
2571 | goto f_err; | |
2572 | } | |
2573 | ||
2574 | if (EC_POINT_copy(clnt_ecpoint, | |
2575 | EC_KEY_get0_public_key(clnt_pub_pkey-> | |
2576 | pkey.ec)) == 0) { | |
e27f234a | 2577 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2578 | goto err; |
2579 | } | |
a71a4966 | 2580 | s->statem.no_cert_verify = 1; |
0f113f3e MC |
2581 | } else { |
2582 | /* | |
2583 | * Get client's public key from encoded point in the | |
2584 | * ClientKeyExchange message. | |
2585 | */ | |
2586 | if ((bn_ctx = BN_CTX_new()) == NULL) { | |
e27f234a | 2587 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2588 | ERR_R_MALLOC_FAILURE); |
2589 | goto err; | |
2590 | } | |
2591 | ||
2592 | /* Get encoded point length */ | |
73999b62 | 2593 | if (!PACKET_get_1(pkt, &i)) { |
efcdbcbe | 2594 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2595 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2596 | SSL_R_LENGTH_MISMATCH); |
2597 | goto f_err; | |
2598 | } | |
73999b62 MC |
2599 | if (!PACKET_get_bytes(pkt, &data, i) |
2600 | || PACKET_remaining(pkt) != 0) { | |
e27f234a | 2601 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2602 | goto err; |
2603 | } | |
efcdbcbe | 2604 | if (EC_POINT_oct2point(group, clnt_ecpoint, data, i, bn_ctx) == 0) { |
e27f234a | 2605 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2606 | goto err; |
2607 | } | |
0f113f3e MC |
2608 | } |
2609 | ||
2610 | /* Compute the shared pre-master secret */ | |
2611 | field_size = EC_GROUP_get_degree(group); | |
2612 | if (field_size <= 0) { | |
e27f234a | 2613 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
0f113f3e MC |
2614 | goto err; |
2615 | } | |
efcdbcbe MC |
2616 | shared = OPENSSL_malloc((field_size + 7) / 8); |
2617 | if (shared == NULL) { | |
e27f234a | 2618 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2619 | goto err; |
2620 | } | |
2621 | i = ECDH_compute_key(shared, (field_size + 7) / 8, clnt_ecpoint, | |
2622 | srvr_ecdh, NULL); | |
0f113f3e | 2623 | if (i <= 0) { |
e27f234a | 2624 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
efcdbcbe | 2625 | OPENSSL_free(shared); |
0f113f3e MC |
2626 | goto err; |
2627 | } | |
2628 | ||
2629 | EVP_PKEY_free(clnt_pub_pkey); | |
2630 | EC_POINT_free(clnt_ecpoint); | |
2631 | EC_KEY_free(srvr_ecdh); | |
2632 | BN_CTX_free(bn_ctx); | |
2633 | EC_KEY_free(s->s3->tmp.ecdh); | |
2634 | s->s3->tmp.ecdh = NULL; | |
2635 | ||
efcdbcbe | 2636 | if (!ssl_generate_master_secret(s, shared, i, 1)) { |
69f68237 | 2637 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2638 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2639 | goto f_err; |
2640 | } | |
e27f234a | 2641 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2642 | } else |
ddac1974 | 2643 | #endif |
edc032b5 | 2644 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 2645 | if (alg_k & SSL_kSRP) { |
73999b62 MC |
2646 | if (!PACKET_get_net_2(pkt, &i) |
2647 | || !PACKET_get_bytes(pkt, &data, i)) { | |
0f113f3e | 2648 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2649 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); |
0f113f3e MC |
2650 | goto f_err; |
2651 | } | |
efcdbcbe | 2652 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { |
e27f234a | 2653 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); |
0f113f3e MC |
2654 | goto err; |
2655 | } | |
2656 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2657 | || BN_is_zero(s->srp_ctx.A)) { | |
2658 | al = SSL_AD_ILLEGAL_PARAMETER; | |
e27f234a | 2659 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2660 | SSL_R_BAD_SRP_PARAMETERS); |
2661 | goto f_err; | |
2662 | } | |
b548a1f1 | 2663 | OPENSSL_free(s->session->srp_username); |
0f113f3e MC |
2664 | s->session->srp_username = BUF_strdup(s->srp_ctx.login); |
2665 | if (s->session->srp_username == NULL) { | |
e27f234a | 2666 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2667 | goto err; |
2668 | } | |
2669 | ||
57b272b0 | 2670 | if (!srp_generate_server_master_secret(s)) { |
e27f234a | 2671 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
2672 | goto err; |
2673 | } | |
0f113f3e MC |
2674 | } else |
2675 | #endif /* OPENSSL_NO_SRP */ | |
2a9b9654 | 2676 | #ifndef OPENSSL_NO_GOST |
0f113f3e | 2677 | if (alg_k & SSL_kGOST) { |
0f113f3e MC |
2678 | EVP_PKEY_CTX *pkey_ctx; |
2679 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2680 | unsigned char premaster_secret[32], *start; | |
2681 | size_t outlen = 32, inlen; | |
2682 | unsigned long alg_a; | |
2683 | int Ttag, Tclass; | |
2684 | long Tlen; | |
73999b62 | 2685 | long sess_key_len; |
0f113f3e MC |
2686 | |
2687 | /* Get our certificate private key */ | |
2688 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
e44380a9 DB |
2689 | if (alg_a & SSL_aGOST12) { |
2690 | /* | |
2691 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2692 | */ | |
2693 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2694 | if (pk == NULL) { | |
2695 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2696 | } | |
2697 | if (pk == NULL) { | |
2698 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2699 | } | |
2700 | } else if (alg_a & SSL_aGOST01) { | |
0f113f3e | 2701 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; |
e44380a9 | 2702 | } |
0f113f3e MC |
2703 | |
2704 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
a71edf3b MC |
2705 | if (pkey_ctx == NULL) { |
2706 | al = SSL_AD_INTERNAL_ERROR; | |
2707 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2708 | goto f_err; | |
2709 | } | |
5f3d93e4 MC |
2710 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { |
2711 | al = SSL_AD_INTERNAL_ERROR; | |
2712 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2713 | goto f_err; | |
2714 | } | |
0f113f3e MC |
2715 | /* |
2716 | * If client certificate is present and is of the same type, maybe | |
2717 | * use it for key exchange. Don't mind errors from | |
2718 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2719 | * client certificate for authorization only. | |
2720 | */ | |
2721 | client_pub_pkey = X509_get_pubkey(s->session->peer); | |
2722 | if (client_pub_pkey) { | |
2723 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2724 | ERR_clear_error(); | |
2725 | } | |
2726 | /* Decrypt session key */ | |
73999b62 MC |
2727 | sess_key_len = PACKET_remaining(pkt); |
2728 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
efcdbcbe | 2729 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2730 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2731 | goto gerr; |
efcdbcbe | 2732 | } |
73999b62 MC |
2733 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, |
2734 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2735 | || Ttag != V_ASN1_SEQUENCE | |
0f113f3e | 2736 | || Tclass != V_ASN1_UNIVERSAL) { |
5f3d93e4 | 2737 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2738 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2739 | SSL_R_DECRYPTION_FAILED); |
2740 | goto gerr; | |
2741 | } | |
efcdbcbe | 2742 | start = data; |
0f113f3e MC |
2743 | inlen = Tlen; |
2744 | if (EVP_PKEY_decrypt | |
2745 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
ba4f1331 | 2746 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2747 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2748 | SSL_R_DECRYPTION_FAILED); |
2749 | goto gerr; | |
2750 | } | |
2751 | /* Generate master secret */ | |
57b272b0 DSH |
2752 | if (!ssl_generate_master_secret(s, premaster_secret, |
2753 | sizeof(premaster_secret), 0)) { | |
69f68237 | 2754 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2755 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2756 | goto gerr; |
69f68237 | 2757 | } |
0f113f3e MC |
2758 | /* Check if pubkey from client certificate was used */ |
2759 | if (EVP_PKEY_CTX_ctrl | |
2760 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
a71a4966 | 2761 | s->statem.no_cert_verify = 1; |
e27f234a MC |
2762 | |
2763 | EVP_PKEY_free(client_pub_pkey); | |
2764 | EVP_PKEY_CTX_free(pkey_ctx); | |
2765 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
0f113f3e MC |
2766 | gerr: |
2767 | EVP_PKEY_free(client_pub_pkey); | |
2768 | EVP_PKEY_CTX_free(pkey_ctx); | |
5f3d93e4 | 2769 | goto f_err; |
2a9b9654 MC |
2770 | } else |
2771 | #endif | |
2772 | { | |
0f113f3e | 2773 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2774 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
0f113f3e MC |
2775 | goto f_err; |
2776 | } | |
2777 | ||
e27f234a | 2778 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2779 | f_err: |
2780 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
556efe79 | 2781 | #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP) |
0f113f3e | 2782 | err: |
ea262260 | 2783 | #endif |
556efe79 | 2784 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2785 | EVP_PKEY_free(clnt_pub_pkey); |
2786 | EC_POINT_free(clnt_ecpoint); | |
8fdc3734 | 2787 | EC_KEY_free(srvr_ecdh); |
0f113f3e | 2788 | BN_CTX_free(bn_ctx); |
20ca916d | 2789 | OPENSSL_free(rsa_decrypt); |
85269210 DSH |
2790 | #endif |
2791 | #ifndef OPENSSL_NO_PSK | |
2792 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2793 | s->s3->tmp.psk = NULL; | |
58964a49 | 2794 | #endif |
fe3a3291 | 2795 | ossl_statem_set_error(s); |
e27f234a | 2796 | return MSG_PROCESS_ERROR; |
0f113f3e | 2797 | } |
d02b48c6 | 2798 | |
be3583fa | 2799 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2800 | { |
94836de2 | 2801 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2802 | if (wst == WORK_MORE_A) { |
2803 | if (SSL_IS_DTLS(s)) { | |
2804 | unsigned char sctpauthkey[64]; | |
2805 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2806 | /* | |
2807 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2808 | * used. | |
2809 | */ | |
141eb8c6 MC |
2810 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2811 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2812 | |
2813 | if (SSL_export_keying_material(s, sctpauthkey, | |
2814 | sizeof(sctpauthkey), labelbuffer, | |
2815 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2816 | ossl_statem_set_error(s); |
c130dd8e MC |
2817 | return WORK_ERROR;; |
2818 | } | |
94836de2 | 2819 | |
c130dd8e MC |
2820 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2821 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2822 | } |
c130dd8e MC |
2823 | wst = WORK_MORE_B; |
2824 | } | |
94836de2 | 2825 | |
c130dd8e MC |
2826 | if ((wst == WORK_MORE_B) |
2827 | /* Is this SCTP? */ | |
2828 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2829 | /* Are we renegotiating? */ | |
2830 | && s->renegotiate | |
2831 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2832 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2833 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2834 | s->s3->in_read_app_data = 2; | |
2835 | s->rwstate = SSL_READING; | |
2836 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2837 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2838 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2839 | return WORK_MORE_B; |
2840 | } else { | |
fe3a3291 | 2841 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2842 | } |
2843 | #endif | |
2844 | ||
a71a4966 | 2845 | if (s->statem.no_cert_verify) { |
94836de2 MC |
2846 | /* No certificate verify so we no longer need the handshake_buffer */ |
2847 | BIO_free(s->s3->handshake_buffer); | |
e44380a9 | 2848 | s->s3->handshake_buffer = NULL; |
94836de2 | 2849 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2850 | } else { |
94836de2 MC |
2851 | if (!s->session->peer) { |
2852 | /* No peer certificate so we no longer need the handshake_buffer */ | |
2853 | BIO_free(s->s3->handshake_buffer); | |
2854 | return WORK_FINISHED_CONTINUE; | |
2855 | } | |
2856 | if (!s->s3->handshake_buffer) { | |
2857 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2858 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2859 | ossl_statem_set_error(s); |
94836de2 MC |
2860 | return WORK_ERROR; |
2861 | } | |
2862 | /* | |
2863 | * For sigalgs freeze the handshake buffer. If we support | |
2864 | * extms we've done this already so this is a no-op | |
2865 | */ | |
2866 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2867 | ossl_statem_set_error(s); |
94836de2 MC |
2868 | return WORK_ERROR; |
2869 | } | |
94836de2 MC |
2870 | } |
2871 | ||
2872 | return WORK_FINISHED_CONTINUE; | |
2873 | } | |
2874 | ||
be3583fa | 2875 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2876 | { |
2877 | EVP_PKEY *pkey = NULL; | |
2878 | unsigned char *sig, *data; | |
2879 | int al, ret = MSG_PROCESS_ERROR; | |
28f4580c | 2880 | int type = 0, j; |
e27f234a MC |
2881 | unsigned int len; |
2882 | X509 *peer; | |
2883 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2884 | long hdatalen = 0; |
2885 | void *hdata; | |
2886 | ||
e27f234a | 2887 | EVP_MD_CTX mctx; |
e27f234a MC |
2888 | EVP_MD_CTX_init(&mctx); |
2889 | ||
a0bd6493 MC |
2890 | peer = s->session->peer; |
2891 | pkey = X509_get_pubkey(peer); | |
2892 | type = X509_certificate_type(peer, pkey); | |
0f113f3e MC |
2893 | |
2894 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2895 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2896 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2897 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2898 | goto f_err; | |
2899 | } | |
2900 | ||
0f113f3e MC |
2901 | /* Check for broken implementations of GOST ciphersuites */ |
2902 | /* | |
2903 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2904 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2905 | */ |
2a9b9654 | 2906 | #ifndef OPENSSL_NO_GOST |
73999b62 | 2907 | if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) { |
f532a35d | 2908 | len = 64; |
2a9b9654 MC |
2909 | } else |
2910 | #endif | |
2911 | { | |
0f113f3e | 2912 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2913 | int rv; |
2914 | ||
73999b62 | 2915 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2916 | al = SSL_AD_DECODE_ERROR; |
2917 | goto f_err; | |
2918 | } | |
2919 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2920 | if (rv == -1) { |
2921 | al = SSL_AD_INTERNAL_ERROR; | |
2922 | goto f_err; | |
2923 | } else if (rv == 0) { | |
2924 | al = SSL_AD_DECODE_ERROR; | |
2925 | goto f_err; | |
2926 | } | |
f37f20ff | 2927 | #ifdef SSL_DEBUG |
0f113f3e | 2928 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2929 | #endif |
28f4580c | 2930 | } else { |
aa430c74 DSH |
2931 | /* Use default digest for this key type */ |
2932 | int idx = ssl_cert_type(NULL, pkey); | |
2933 | if (idx >= 0) | |
2934 | md = s->s3->tmp.md[idx]; | |
2935 | if (md == NULL) { | |
2936 | al = SSL_AD_INTERNAL_ERROR; | |
2937 | goto f_err; | |
2938 | } | |
0f113f3e | 2939 | } |
aa430c74 | 2940 | |
73999b62 | 2941 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2942 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2943 | al = SSL_AD_DECODE_ERROR; |
2944 | goto f_err; | |
2945 | } | |
2946 | } | |
2947 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
2948 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
2949 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 2950 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2951 | al = SSL_AD_DECODE_ERROR; |
2952 | goto f_err; | |
2953 | } | |
73999b62 | 2954 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2955 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2956 | al = SSL_AD_DECODE_ERROR; |
2957 | goto f_err; | |
2958 | } | |
0f113f3e | 2959 | |
28f4580c DSH |
2960 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2961 | if (hdatalen <= 0) { | |
2962 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2963 | al = SSL_AD_INTERNAL_ERROR; | |
2964 | goto f_err; | |
2965 | } | |
f37f20ff | 2966 | #ifdef SSL_DEBUG |
28f4580c | 2967 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2968 | #endif |
28f4580c DSH |
2969 | if (!EVP_VerifyInit_ex(&mctx, md, NULL) |
2970 | || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) { | |
2971 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2972 | al = SSL_AD_INTERNAL_ERROR; | |
2973 | goto f_err; | |
2974 | } | |
0f113f3e | 2975 | |
2a9b9654 | 2976 | #ifndef OPENSSL_NO_GOST |
28f4580c DSH |
2977 | if (pkey->type == NID_id_GostR3410_2001 |
2978 | || pkey->type == NID_id_GostR3410_2012_256 | |
2979 | || pkey->type == NID_id_GostR3410_2012_512) { | |
2a9b9654 | 2980 | BUF_reverse(data, NULL, len); |
28f4580c | 2981 | } |
2a9b9654 | 2982 | #endif |
e44380a9 | 2983 | |
28f4580c DSH |
2984 | if (s->version == SSL3_VERSION |
2985 | && !EVP_MD_CTX_ctrl(&mctx, EVP_CTRL_SSL3_MASTER_SECRET, | |
2986 | s->session->master_key_length, | |
2987 | s->session->master_key)) { | |
2988 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2989 | al = SSL_AD_INTERNAL_ERROR; | |
2990 | goto f_err; | |
2991 | } | |
2992 | ||
2993 | if (EVP_VerifyFinal(&mctx, data, len, pkey) <= 0) { | |
2994 | al = SSL_AD_DECRYPT_ERROR; | |
2995 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2996 | goto f_err; |
2997 | } | |
2998 | ||
c130dd8e | 2999 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
3000 | if (0) { |
3001 | f_err: | |
3002 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 3003 | ossl_statem_set_error(s); |
0f113f3e | 3004 | } |
25aaa98a RS |
3005 | BIO_free(s->s3->handshake_buffer); |
3006 | s->s3->handshake_buffer = NULL; | |
0f113f3e MC |
3007 | EVP_MD_CTX_cleanup(&mctx); |
3008 | EVP_PKEY_free(pkey); | |
e27f234a | 3009 | return ret; |
0f113f3e | 3010 | } |
d02b48c6 | 3011 | |
be3583fa | 3012 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 3013 | { |
20dbe585 | 3014 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
3015 | X509 *x = NULL; |
3016 | unsigned long l, llen; | |
3017 | const unsigned char *certstart; | |
3018 | unsigned char *certbytes; | |
3019 | STACK_OF(X509) *sk = NULL; | |
73999b62 | 3020 | PACKET spkt; |
0f113f3e MC |
3021 | |
3022 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
3023 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3024 | goto f_err; | |
0f113f3e MC |
3025 | } |
3026 | ||
73999b62 MC |
3027 | if (!PACKET_get_net_3(pkt, &llen) |
3028 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
3029 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 3030 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3031 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
3032 | goto f_err; |
3033 | } | |
0bc09ecd MC |
3034 | |
3035 | while (PACKET_remaining(&spkt) > 0) { | |
3036 | if (!PACKET_get_net_3(&spkt, &l) | |
3037 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 3038 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3039 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3040 | SSL_R_CERT_LENGTH_MISMATCH); |
3041 | goto f_err; | |
3042 | } | |
3043 | ||
0bc09ecd MC |
3044 | certstart = certbytes; |
3045 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 3046 | if (x == NULL) { |
e27f234a MC |
3047 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
3048 | goto f_err; | |
0f113f3e | 3049 | } |
0bc09ecd | 3050 | if (certbytes != (certstart + l)) { |
0f113f3e | 3051 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3052 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3053 | SSL_R_CERT_LENGTH_MISMATCH); |
3054 | goto f_err; | |
3055 | } | |
3056 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
3057 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3058 | goto f_err; | |
0f113f3e MC |
3059 | } |
3060 | x = NULL; | |
0f113f3e MC |
3061 | } |
3062 | ||
3063 | if (sk_X509_num(sk) <= 0) { | |
3064 | /* TLS does not mind 0 certs returned */ | |
3065 | if (s->version == SSL3_VERSION) { | |
3066 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3067 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3068 | SSL_R_NO_CERTIFICATES_RETURNED); |
3069 | goto f_err; | |
3070 | } | |
3071 | /* Fail for TLS only if we required a certificate */ | |
3072 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
3073 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 3074 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3075 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
3076 | al = SSL_AD_HANDSHAKE_FAILURE; | |
3077 | goto f_err; | |
3078 | } | |
3079 | /* No client certificate so digest cached records */ | |
124037fd | 3080 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
3081 | goto f_err; |
3082 | } | |
3083 | } else { | |
3084 | EVP_PKEY *pkey; | |
3085 | i = ssl_verify_cert_chain(s, sk); | |
3086 | if (i <= 0) { | |
3087 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 3088 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3089 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
3090 | goto f_err; | |
3091 | } | |
3092 | if (i > 1) { | |
e27f234a | 3093 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
3094 | al = SSL_AD_HANDSHAKE_FAILURE; |
3095 | goto f_err; | |
3096 | } | |
3097 | pkey = X509_get_pubkey(sk_X509_value(sk, 0)); | |
3098 | if (pkey == NULL) { | |
3099 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3100 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3101 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
3102 | goto f_err; | |
3103 | } | |
3104 | EVP_PKEY_free(pkey); | |
3105 | } | |
3106 | ||
222561fe | 3107 | X509_free(s->session->peer); |
0f113f3e MC |
3108 | s->session->peer = sk_X509_shift(sk); |
3109 | s->session->verify_result = s->verify_result; | |
3110 | ||
c34b0f99 DSH |
3111 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
3112 | s->session->peer_chain = sk; | |
0f113f3e MC |
3113 | /* |
3114 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
3115 | * certificate, while we do include it in s3_clnt.c | |
3116 | */ | |
0f113f3e | 3117 | sk = NULL; |
e27f234a | 3118 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
3119 | goto done; |
3120 | ||
0f113f3e | 3121 | f_err: |
66696478 | 3122 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 3123 | ossl_statem_set_error(s); |
66696478 | 3124 | done: |
222561fe RS |
3125 | X509_free(x); |
3126 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 3127 | return ret; |
0f113f3e | 3128 | } |
d02b48c6 | 3129 | |
e27f234a MC |
3130 | int tls_construct_server_certificate(SSL *s) |
3131 | { | |
3132 | CERT_PKEY *cpk; | |
3133 | ||
3134 | cpk = ssl_get_server_send_pkey(s); | |
3135 | if (cpk == NULL) { | |
3136 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 3137 | ossl_statem_set_error(s); |
e27f234a MC |
3138 | return 0; |
3139 | } | |
3140 | ||
3141 | if (!ssl3_output_cert_chain(s, cpk)) { | |
3142 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 3143 | ossl_statem_set_error(s); |
e27f234a MC |
3144 | return 0; |
3145 | } | |
3146 | ||
3147 | return 1; | |
3148 | } | |
3149 | ||
e27f234a MC |
3150 | int tls_construct_new_session_ticket(SSL *s) |
3151 | { | |
3152 | unsigned char *senc = NULL; | |
3153 | EVP_CIPHER_CTX ctx; | |
fa0c23de | 3154 | HMAC_CTX hctx = HMAC_CTX_EMPTY; |
e27f234a MC |
3155 | unsigned char *p, *macstart; |
3156 | const unsigned char *const_p; | |
3157 | int len, slen_full, slen; | |
3158 | SSL_SESSION *sess; | |
3159 | unsigned int hlen; | |
3160 | SSL_CTX *tctx = s->initial_ctx; | |
3161 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
3162 | unsigned char key_name[16]; | |
3163 | ||
3164 | /* get session encoding length */ | |
3165 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
3166 | /* | |
3167 | * Some length values are 16 bits, so forget it if session is too | |
3168 | * long | |
3169 | */ | |
3170 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 3171 | ossl_statem_set_error(s); |
e27f234a MC |
3172 | return 0; |
3173 | } | |
3174 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 3175 | if (senc == NULL) { |
fe3a3291 | 3176 | ossl_statem_set_error(s); |
e27f234a MC |
3177 | return 0; |
3178 | } | |
0f113f3e | 3179 | |
e27f234a MC |
3180 | EVP_CIPHER_CTX_init(&ctx); |
3181 | HMAC_CTX_init(&hctx); | |
0f113f3e | 3182 | |
e27f234a MC |
3183 | p = senc; |
3184 | if (!i2d_SSL_SESSION(s->session, &p)) | |
3185 | goto err; | |
687eaf27 | 3186 | |
e27f234a MC |
3187 | /* |
3188 | * create a fresh copy (not shared with other threads) to clean up | |
3189 | */ | |
3190 | const_p = senc; | |
3191 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3192 | if (sess == NULL) | |
3193 | goto err; | |
3194 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3195 | |
e27f234a MC |
3196 | slen = i2d_SSL_SESSION(sess, NULL); |
3197 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3198 | SSL_SESSION_free(sess); | |
3199 | goto err; | |
3200 | } | |
3201 | p = senc; | |
3202 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3203 | SSL_SESSION_free(sess); | |
3204 | goto err; | |
3205 | } | |
3206 | SSL_SESSION_free(sess); | |
0f113f3e | 3207 | |
e27f234a MC |
3208 | /*- |
3209 | * Grow buffer if need be: the length calculation is as | |
3210 | * follows handshake_header_length + | |
3211 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
3212 | * 16 (key name) + max_iv_len (iv length) + | |
3213 | * session_length + max_enc_block_size (max encrypted session | |
3214 | * length) + max_md_size (HMAC). | |
3215 | */ | |
3216 | if (!BUF_MEM_grow(s->init_buf, | |
3217 | SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + | |
3218 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
3219 | goto err; | |
0f113f3e | 3220 | |
e27f234a MC |
3221 | p = ssl_handshake_start(s); |
3222 | /* | |
3223 | * Initialize HMAC and cipher contexts. If callback present it does | |
3224 | * all the work otherwise use generated values from parent ctx. | |
3225 | */ | |
3226 | if (tctx->tlsext_ticket_key_cb) { | |
3227 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, | |
3228 | &hctx, 1) < 0) | |
3229 | goto err; | |
3230 | } else { | |
3231 | if (RAND_bytes(iv, 16) <= 0) | |
687eaf27 | 3232 | goto err; |
e27f234a MC |
3233 | if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, |
3234 | tctx->tlsext_tick_aes_key, iv)) | |
687eaf27 | 3235 | goto err; |
e27f234a MC |
3236 | if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
3237 | EVP_sha256(), NULL)) | |
4f9fab6b | 3238 | goto err; |
e27f234a | 3239 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
0f113f3e MC |
3240 | } |
3241 | ||
e27f234a MC |
3242 | /* |
3243 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3244 | * for resumed session (for simplicity), and guess that tickets for | |
3245 | * new sessions will live as long as their sessions. | |
3246 | */ | |
3247 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3248 | ||
3249 | /* Skip ticket length for now */ | |
3250 | p += 2; | |
3251 | /* Output key name */ | |
3252 | macstart = p; | |
3253 | memcpy(p, key_name, 16); | |
3254 | p += 16; | |
3255 | /* output IV */ | |
3256 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); | |
3257 | p += EVP_CIPHER_CTX_iv_length(&ctx); | |
3258 | /* Encrypt session data */ | |
3259 | if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen)) | |
3260 | goto err; | |
3261 | p += len; | |
3262 | if (!EVP_EncryptFinal(&ctx, p, &len)) | |
3263 | goto err; | |
3264 | p += len; | |
3265 | ||
3266 | if (!HMAC_Update(&hctx, macstart, p - macstart)) | |
3267 | goto err; | |
3268 | if (!HMAC_Final(&hctx, p, &hlen)) | |
3269 | goto err; | |
3270 | ||
3271 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3272 | HMAC_CTX_cleanup(&hctx); | |
3273 | ||
3274 | p += hlen; | |
3275 | /* Now write out lengths: p points to end of data written */ | |
3276 | /* Total length */ | |
3277 | len = p - ssl_handshake_start(s); | |
3278 | /* Skip ticket lifetime hint */ | |
3279 | p = ssl_handshake_start(s) + 4; | |
3280 | s2n(len - 6, p); | |
3281 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3282 | goto err; | |
3283 | OPENSSL_free(senc); | |
3284 | ||
3285 | return 1; | |
687eaf27 | 3286 | err: |
b548a1f1 | 3287 | OPENSSL_free(senc); |
687eaf27 MC |
3288 | EVP_CIPHER_CTX_cleanup(&ctx); |
3289 | HMAC_CTX_cleanup(&hctx); | |
fe3a3291 | 3290 | ossl_statem_set_error(s); |
e27f234a | 3291 | return 0; |
0f113f3e | 3292 | } |
67c8e7f4 | 3293 | |
e27f234a MC |
3294 | int tls_construct_cert_status(SSL *s) |
3295 | { | |
3296 | unsigned char *p; | |
3297 | /*- | |
3298 | * Grow buffer if need be: the length calculation is as | |
3299 | * follows 1 (message type) + 3 (message length) + | |
3300 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3301 | * + (ocsp response) | |
3302 | */ | |
3303 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3304 | ossl_statem_set_error(s); |
e27f234a MC |
3305 | return 0; |
3306 | } | |
3307 | ||
3308 | p = (unsigned char *)s->init_buf->data; | |
3309 | ||
3310 | /* do the header */ | |
3311 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3312 | /* message length */ | |
3313 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3314 | /* status type */ | |
3315 | *(p++) = s->tlsext_status_type; | |
3316 | /* length of OCSP response */ | |
3317 | l2n3(s->tlsext_ocsp_resplen, p); | |
3318 | /* actual response */ | |
3319 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3320 | /* number of bytes to write */ | |
3321 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3322 | s->init_off = 0; | |
3323 | ||
3324 | return 1; | |
3325 | } | |
3326 | ||
e481f9b9 | 3327 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3328 | /* |
3329 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3330 | * It sets the next_proto member in s if found | |
3331 | */ | |
be3583fa | 3332 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3333 | { |
73999b62 | 3334 | PACKET next_proto, padding; |
e27f234a MC |
3335 | size_t next_proto_len; |
3336 | ||
50e735f9 MC |
3337 | /*- |
3338 | * The payload looks like: | |
3339 | * uint8 proto_len; | |
3340 | * uint8 proto[proto_len]; | |
3341 | * uint8 padding_len; | |
3342 | * uint8 padding[padding_len]; | |
3343 | */ | |
73999b62 MC |
3344 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3345 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3346 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3347 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3348 | goto err; |
cf9b0b6f | 3349 | } |
0f113f3e | 3350 | |
6d41fc80 EK |
3351 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3352 | &next_proto_len)) { | |
3353 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3354 | goto err; |
3355 | } | |
3356 | ||
6d41fc80 | 3357 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3358 | |
e27f234a | 3359 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3360 | err: |
fe3a3291 | 3361 | ossl_statem_set_error(s); |
e27f234a | 3362 | return MSG_PROCESS_ERROR; |
0f113f3e | 3363 | } |
6434abbf | 3364 | #endif |
d45ba43d MC |
3365 | |
3366 | #define SSLV2_CIPHER_LEN 3 | |
3367 | ||
38a3cbfb EK |
3368 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3369 | PACKET *cipher_suites, | |
d45ba43d | 3370 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3371 | int sslv2format, int *al |
3372 | ) | |
d45ba43d MC |
3373 | { |
3374 | const SSL_CIPHER *c; | |
3375 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3376 | int n; |
3377 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3378 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3379 | |
38a3cbfb EK |
3380 | s->s3->send_connection_binding = 0; |
3381 | ||
3382 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3383 | ||
3384 | if (PACKET_remaining(cipher_suites) == 0) { | |
3385 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3386 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3387 | return NULL; | |
d45ba43d | 3388 | } |
38a3cbfb EK |
3389 | |
3390 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3391 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3392 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3393 | *al = SSL_AD_DECODE_ERROR; |
3394 | return NULL; | |
d45ba43d | 3395 | } |
38a3cbfb | 3396 | |
d45ba43d MC |
3397 | if ((skp == NULL) || (*skp == NULL)) { |
3398 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3399 | if(sk == NULL) { | |
3400 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3401 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3402 | return NULL; |
3403 | } | |
3404 | } else { | |
3405 | sk = *skp; | |
3406 | sk_SSL_CIPHER_zero(sk); | |
3407 | } | |
3408 | ||
38a3cbfb EK |
3409 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3410 | &s->s3->tmp.ciphers_rawlen)) { | |
3411 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3412 | goto err; |
3413 | } | |
d45ba43d | 3414 | |
38a3cbfb EK |
3415 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3416 | /* | |
20218b58 EK |
3417 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3418 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3419 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3420 | */ |
3421 | if (sslv2format && cipher[0] != '\0') | |
3422 | continue; | |
3423 | ||
d45ba43d | 3424 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3425 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3426 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3427 | /* SCSV fatal if renegotiating */ |
3428 | if (s->renegotiate) { | |
3429 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3430 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3431 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3432 | goto err; |
3433 | } | |
3434 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3435 | #ifdef OPENSSL_RI_DEBUG |
3436 | fprintf(stderr, "SCSV received by server\n"); | |
3437 | #endif | |
3438 | continue; | |
3439 | } | |
3440 | ||
3441 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3442 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3443 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3444 | /* |
3445 | * The SCSV indicates that the client previously tried a higher | |
3446 | * version. Fail if the current version is an unexpected | |
3447 | * downgrade. | |
3448 | */ | |
3449 | if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) { | |
3450 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3451 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3452 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3453 | goto err; |
3454 | } | |
d45ba43d MC |
3455 | continue; |
3456 | } | |
3457 | ||
38a3cbfb EK |
3458 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3459 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3460 | if (c != NULL) { |
3461 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3462 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3463 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3464 | goto err; |
3465 | } | |
3466 | } | |
3467 | } | |
38a3cbfb EK |
3468 | if (PACKET_remaining(cipher_suites) > 0) { |
3469 | *al = SSL_AD_INTERNAL_ERROR; | |
3470 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3471 | goto err; | |
3472 | } | |
d45ba43d MC |
3473 | |
3474 | if (skp != NULL) | |
3475 | *skp = sk; | |
3476 | return (sk); | |
3477 | err: | |
3478 | if ((skp == NULL) || (*skp == NULL)) | |
3479 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3480 | return NULL; |
d45ba43d | 3481 | } |