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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
8e2f6b79 | 57 | /* ==================================================================== |
52b8dad8 | 58 | * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
8e2f6b79 BM |
59 | * |
60 | * Redistribution and use in source and binary forms, with or without | |
61 | * modification, are permitted provided that the following conditions | |
62 | * are met: | |
63 | * | |
64 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 65 | * notice, this list of conditions and the following disclaimer. |
8e2f6b79 BM |
66 | * |
67 | * 2. Redistributions in binary form must reproduce the above copyright | |
68 | * notice, this list of conditions and the following disclaimer in | |
69 | * the documentation and/or other materials provided with the | |
70 | * distribution. | |
71 | * | |
72 | * 3. All advertising materials mentioning features or use of this | |
73 | * software must display the following acknowledgment: | |
74 | * "This product includes software developed by the OpenSSL Project | |
75 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
76 | * | |
77 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
78 | * endorse or promote products derived from this software without | |
79 | * prior written permission. For written permission, please contact | |
80 | * openssl-core@openssl.org. | |
81 | * | |
82 | * 5. Products derived from this software may not be called "OpenSSL" | |
83 | * nor may "OpenSSL" appear in their names without prior written | |
84 | * permission of the OpenSSL Project. | |
85 | * | |
86 | * 6. Redistributions of any form whatsoever must retain the following | |
87 | * acknowledgment: | |
88 | * "This product includes software developed by the OpenSSL Project | |
89 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
90 | * | |
91 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
92 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
93 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
94 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
95 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
96 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
97 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
98 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
99 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
100 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
101 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
102 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
103 | * ==================================================================== | |
104 | * | |
105 | * This product includes cryptographic software written by Eric Young | |
106 | * (eay@cryptsoft.com). This product includes software written by Tim | |
107 | * Hudson (tjh@cryptsoft.com). | |
108 | * | |
109 | */ | |
ea262260 BM |
110 | /* ==================================================================== |
111 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
112 | * | |
0f113f3e | 113 | * Portions of the attached software ("Contribution") are developed by |
ea262260 BM |
114 | * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
115 | * | |
116 | * The Contribution is licensed pursuant to the OpenSSL open source | |
117 | * license provided above. | |
118 | * | |
ea262260 BM |
119 | * ECC cipher suite support in OpenSSL originally written by |
120 | * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. | |
121 | * | |
122 | */ | |
ddac1974 NL |
123 | /* ==================================================================== |
124 | * Copyright 2005 Nokia. All rights reserved. | |
125 | * | |
126 | * The portions of the attached software ("Contribution") is developed by | |
127 | * Nokia Corporation and is licensed pursuant to the OpenSSL open source | |
128 | * license. | |
129 | * | |
130 | * The Contribution, originally written by Mika Kousa and Pasi Eronen of | |
131 | * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites | |
132 | * support (see RFC 4279) to OpenSSL. | |
133 | * | |
134 | * No patent licenses or other rights except those expressly stated in | |
135 | * the OpenSSL open source license shall be deemed granted or received | |
136 | * expressly, by implication, estoppel, or otherwise. | |
137 | * | |
138 | * No assurances are provided by Nokia that the Contribution does not | |
139 | * infringe the patent or other intellectual property rights of any third | |
140 | * party or that the license provides you with all the necessary rights | |
141 | * to make use of the Contribution. | |
142 | * | |
143 | * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN | |
144 | * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA | |
145 | * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY | |
146 | * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR | |
147 | * OTHERWISE. | |
148 | */ | |
d02b48c6 | 149 | |
de469ef2 | 150 | |
d02b48c6 | 151 | #include <stdio.h> |
8ba708e5 | 152 | #include "../ssl_locl.h" |
61ae935a | 153 | #include "statem_locl.h" |
68570797 | 154 | #include "internal/constant_time_locl.h" |
ec577822 BM |
155 | #include <openssl/buffer.h> |
156 | #include <openssl/rand.h> | |
157 | #include <openssl/objects.h> | |
158 | #include <openssl/evp.h> | |
6434abbf | 159 | #include <openssl/hmac.h> |
ec577822 | 160 | #include <openssl/x509.h> |
3c27208f | 161 | #include <openssl/dh.h> |
d095b68d | 162 | #include <openssl/bn.h> |
dbad1690 | 163 | #include <openssl/md5.h> |
f9b3bff6 | 164 | |
38a3cbfb EK |
165 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
166 | PACKET *cipher_suites, | |
167 | STACK_OF(SSL_CIPHER) **skp, | |
168 | int sslv2format, int *al); | |
d45ba43d | 169 | |
61ae935a MC |
170 | /* |
171 | * server_read_transition() encapsulates the logic for the allowed handshake | |
172 | * state transitions when the server is reading messages from the client. The | |
173 | * message type that the client has sent is provided in |mt|. The current state | |
174 | * is in |s->statem.hand_state|. | |
175 | * | |
176 | * Valid return values are: | |
177 | * 1: Success (transition allowed) | |
178 | * 0: Error (transition not allowed) | |
179 | */ | |
8481f583 | 180 | int ossl_statem_server_read_transition(SSL *s, int mt) |
61ae935a | 181 | { |
d6f1a6e9 | 182 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
183 | |
184 | switch(st->hand_state) { | |
185 | case TLS_ST_BEFORE: | |
186 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
187 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
188 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
189 | return 1; | |
190 | } | |
191 | break; | |
192 | ||
193 | case TLS_ST_SW_SRVR_DONE: | |
194 | /* | |
195 | * If we get a CKE message after a ServerDone then either | |
196 | * 1) We didn't request a Certificate | |
197 | * OR | |
198 | * 2) If we did request one then | |
199 | * a) We allow no Certificate to be returned | |
200 | * AND | |
201 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
202 | * list if we requested a certificate) | |
203 | */ | |
204 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE | |
205 | && (!s->s3->tmp.cert_request | |
206 | || (!((s->verify_mode & SSL_VERIFY_PEER) && | |
207 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
208 | && (s->version == SSL3_VERSION)))) { | |
209 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
210 | return 1; | |
211 | } else if (s->s3->tmp.cert_request) { | |
212 | if (mt == SSL3_MT_CERTIFICATE) { | |
213 | st->hand_state = TLS_ST_SR_CERT; | |
214 | return 1; | |
f100b031 | 215 | } |
61ae935a MC |
216 | } |
217 | break; | |
218 | ||
219 | case TLS_ST_SR_CERT: | |
220 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
221 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
222 | return 1; | |
223 | } | |
224 | break; | |
225 | ||
226 | case TLS_ST_SR_KEY_EXCH: | |
227 | /* | |
228 | * We should only process a CertificateVerify message if we have | |
229 | * received a Certificate from the client. If so then |s->session->peer| | |
230 | * will be non NULL. In some instances a CertificateVerify message is | |
231 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 232 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
233 | * set. |
234 | */ | |
a71a4966 | 235 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
236 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
237 | /* | |
238 | * For the ECDH ciphersuites when the client sends its ECDH | |
239 | * pub key in a certificate, the CertificateVerify message is | |
240 | * not sent. Also for GOST ciphersuites when the client uses | |
241 | * its key from the certificate for key exchange. | |
242 | */ | |
243 | st->hand_state = TLS_ST_SR_CHANGE; | |
244 | return 1; | |
245 | } | |
246 | } else { | |
247 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
248 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
249 | return 1; | |
250 | } | |
251 | } | |
252 | break; | |
253 | ||
254 | case TLS_ST_SR_CERT_VRFY: | |
255 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
256 | st->hand_state = TLS_ST_SR_CHANGE; | |
257 | return 1; | |
258 | } | |
259 | break; | |
260 | ||
261 | case TLS_ST_SR_CHANGE: | |
262 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
263 | if (s->s3->next_proto_neg_seen) { | |
264 | if (mt == SSL3_MT_NEXT_PROTO) { | |
265 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
266 | return 1; | |
267 | } | |
268 | } else { | |
269 | #endif | |
270 | if (mt == SSL3_MT_FINISHED) { | |
271 | st->hand_state = TLS_ST_SR_FINISHED; | |
272 | return 1; | |
273 | } | |
274 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
275 | } | |
276 | #endif | |
277 | break; | |
278 | ||
279 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
280 | case TLS_ST_SR_NEXT_PROTO: | |
281 | if (mt == SSL3_MT_FINISHED) { | |
282 | st->hand_state = TLS_ST_SR_FINISHED; | |
283 | return 1; | |
284 | } | |
285 | break; | |
286 | #endif | |
287 | ||
288 | case TLS_ST_SW_FINISHED: | |
289 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
290 | st->hand_state = TLS_ST_SR_CHANGE; | |
291 | return 1; | |
292 | } | |
293 | break; | |
294 | ||
295 | default: | |
296 | break; | |
297 | } | |
298 | ||
299 | /* No valid transition found */ | |
300 | return 0; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Should we send a ServerKeyExchange message? | |
305 | * | |
306 | * Valid return values are: | |
307 | * 1: Yes | |
308 | * 0: No | |
309 | */ | |
bb3e20cf | 310 | static int send_server_key_exchange(SSL *s) |
61ae935a MC |
311 | { |
312 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
313 | ||
314 | /* | |
361a1191 | 315 | * only send a ServerKeyExchange if DH or fortezza but we have a |
61ae935a MC |
316 | * sign only certificate PSK: may send PSK identity hints For |
317 | * ECC ciphersuites, we send a serverKeyExchange message only if | |
318 | * the cipher suite is either ECDH-anon or ECDHE. In other cases, | |
319 | * the server certificate contains the server's public key for | |
320 | * key exchange. | |
321 | */ | |
bc71f910 | 322 | if (alg_k & (SSL_kDHE|SSL_kECDHE) |
61ae935a MC |
323 | /* |
324 | * PSK: send ServerKeyExchange if PSK identity hint if | |
325 | * provided | |
326 | */ | |
327 | #ifndef OPENSSL_NO_PSK | |
328 | /* Only send SKE if we have identity hint for plain PSK */ | |
329 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
330 | && s->cert->psk_identity_hint) | |
331 | /* For other PSK always send SKE */ | |
332 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
333 | #endif | |
334 | #ifndef OPENSSL_NO_SRP | |
335 | /* SRP: send ServerKeyExchange */ | |
336 | || (alg_k & SSL_kSRP) | |
337 | #endif | |
338 | ) { | |
339 | return 1; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Should we send a CertificateRequest message? | |
347 | * | |
348 | * Valid return values are: | |
349 | * 1: Yes | |
350 | * 0: No | |
351 | */ | |
bb3e20cf | 352 | static int send_certificate_request(SSL *s) |
61ae935a MC |
353 | { |
354 | if ( | |
355 | /* don't request cert unless asked for it: */ | |
356 | s->verify_mode & SSL_VERIFY_PEER | |
357 | /* | |
358 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
359 | * during re-negotiation: | |
360 | */ | |
361 | && ((s->session->peer == NULL) || | |
362 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) | |
363 | /* | |
364 | * never request cert in anonymous ciphersuites (see | |
365 | * section "Certificate request" in SSL 3 drafts and in | |
366 | * RFC 2246): | |
367 | */ | |
368 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
369 | /* | |
370 | * ... except when the application insists on | |
371 | * verification (against the specs, but s3_clnt.c accepts | |
372 | * this for SSL 3) | |
373 | */ | |
374 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
375 | /* don't request certificate for SRP auth */ | |
376 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
377 | /* | |
378 | * With normal PSK Certificates and Certificate Requests | |
379 | * are omitted | |
380 | */ | |
b7fa1f98 | 381 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { |
61ae935a MC |
382 | return 1; |
383 | } | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | /* | |
389 | * server_write_transition() works out what handshake state to move to next | |
390 | * when the server is writing messages to be sent to the client. | |
391 | */ | |
8481f583 | 392 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s) |
61ae935a | 393 | { |
d6f1a6e9 | 394 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
395 | |
396 | switch(st->hand_state) { | |
397 | case TLS_ST_BEFORE: | |
398 | /* Just go straight to trying to read from the client */; | |
399 | return WRITE_TRAN_FINISHED; | |
400 | ||
401 | case TLS_ST_OK: | |
402 | /* We must be trying to renegotiate */ | |
403 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
404 | return WRITE_TRAN_CONTINUE; | |
405 | ||
406 | case TLS_ST_SW_HELLO_REQ: | |
407 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 408 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
409 | return WRITE_TRAN_CONTINUE; |
410 | ||
411 | case TLS_ST_SR_CLNT_HELLO: | |
412 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
413 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) | |
414 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; | |
415 | else | |
416 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
417 | return WRITE_TRAN_CONTINUE; | |
418 | ||
419 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
420 | return WRITE_TRAN_FINISHED; | |
421 | ||
422 | case TLS_ST_SW_SRVR_HELLO: | |
423 | if (s->hit) { | |
424 | if (s->tlsext_ticket_expected) | |
425 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
426 | else | |
427 | st->hand_state = TLS_ST_SW_CHANGE; | |
428 | } else { | |
429 | /* Check if it is anon DH or anon ECDH, */ | |
430 | /* normal PSK or SRP */ | |
431 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
432 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { | |
433 | st->hand_state = TLS_ST_SW_CERT; | |
434 | } else if (send_server_key_exchange(s)) { | |
435 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
436 | } else if (send_certificate_request(s)) { | |
437 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
438 | } else { | |
439 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
440 | } | |
441 | } | |
442 | return WRITE_TRAN_CONTINUE; | |
443 | ||
444 | case TLS_ST_SW_CERT: | |
445 | if (s->tlsext_status_expected) { | |
446 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
447 | return WRITE_TRAN_CONTINUE; | |
448 | } | |
449 | /* Fall through */ | |
450 | ||
451 | case TLS_ST_SW_CERT_STATUS: | |
452 | if (send_server_key_exchange(s)) { | |
453 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
454 | return WRITE_TRAN_CONTINUE; | |
455 | } | |
456 | /* Fall through */ | |
457 | ||
458 | case TLS_ST_SW_KEY_EXCH: | |
459 | if (send_certificate_request(s)) { | |
460 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
461 | return WRITE_TRAN_CONTINUE; | |
462 | } | |
463 | /* Fall through */ | |
464 | ||
465 | case TLS_ST_SW_CERT_REQ: | |
466 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
467 | return WRITE_TRAN_CONTINUE; | |
468 | ||
469 | case TLS_ST_SW_SRVR_DONE: | |
470 | return WRITE_TRAN_FINISHED; | |
471 | ||
472 | case TLS_ST_SR_FINISHED: | |
473 | if (s->hit) { | |
474 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 475 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
476 | return WRITE_TRAN_CONTINUE; |
477 | } else if (s->tlsext_ticket_expected) { | |
478 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
479 | } else { | |
480 | st->hand_state = TLS_ST_SW_CHANGE; | |
481 | } | |
482 | return WRITE_TRAN_CONTINUE; | |
483 | ||
484 | case TLS_ST_SW_SESSION_TICKET: | |
485 | st->hand_state = TLS_ST_SW_CHANGE; | |
486 | return WRITE_TRAN_CONTINUE; | |
487 | ||
488 | case TLS_ST_SW_CHANGE: | |
489 | st->hand_state = TLS_ST_SW_FINISHED; | |
490 | return WRITE_TRAN_CONTINUE; | |
491 | ||
492 | case TLS_ST_SW_FINISHED: | |
493 | if (s->hit) { | |
494 | return WRITE_TRAN_FINISHED; | |
495 | } | |
496 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 497 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
498 | return WRITE_TRAN_CONTINUE; |
499 | ||
500 | default: | |
501 | /* Shouldn't happen */ | |
502 | return WRITE_TRAN_ERROR; | |
503 | } | |
504 | } | |
505 | ||
506 | /* | |
507 | * Perform any pre work that needs to be done prior to sending a message from | |
508 | * the server to the client. | |
509 | */ | |
8481f583 | 510 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) |
61ae935a | 511 | { |
d6f1a6e9 | 512 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
513 | |
514 | switch(st->hand_state) { | |
515 | case TLS_ST_SW_HELLO_REQ: | |
516 | s->shutdown = 0; | |
517 | if (SSL_IS_DTLS(s)) | |
518 | dtls1_clear_record_buffer(s); | |
519 | break; | |
520 | ||
521 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
522 | s->shutdown = 0; | |
523 | if (SSL_IS_DTLS(s)) { | |
524 | dtls1_clear_record_buffer(s); | |
525 | /* We don't buffer this message so don't use the timer */ | |
526 | st->use_timer = 0; | |
527 | } | |
528 | break; | |
529 | ||
530 | case TLS_ST_SW_SRVR_HELLO: | |
531 | if (SSL_IS_DTLS(s)) { | |
532 | /* | |
533 | * Messages we write from now on should be bufferred and | |
534 | * retransmitted if necessary, so we need to use the timer now | |
535 | */ | |
536 | st->use_timer = 1; | |
537 | } | |
538 | break; | |
539 | ||
540 | case TLS_ST_SW_SRVR_DONE: | |
541 | #ifndef OPENSSL_NO_SCTP | |
542 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
543 | return dtls_wait_for_dry(s); | |
544 | #endif | |
545 | return WORK_FINISHED_CONTINUE; | |
546 | ||
547 | case TLS_ST_SW_SESSION_TICKET: | |
548 | if (SSL_IS_DTLS(s)) { | |
549 | /* | |
550 | * We're into the last flight. We don't retransmit the last flight | |
551 | * unless we need to, so we don't use the timer | |
552 | */ | |
553 | st->use_timer = 0; | |
554 | } | |
555 | break; | |
556 | ||
557 | case TLS_ST_SW_CHANGE: | |
558 | s->session->cipher = s->s3->tmp.new_cipher; | |
559 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 560 | ossl_statem_set_error(s); |
61ae935a MC |
561 | return WORK_ERROR; |
562 | } | |
563 | if (SSL_IS_DTLS(s)) { | |
564 | /* | |
565 | * We're into the last flight. We don't retransmit the last flight | |
566 | * unless we need to, so we don't use the timer. This might have | |
567 | * already been set to 0 if we sent a NewSessionTicket message, | |
568 | * but we'll set it again here in case we didn't. | |
569 | */ | |
570 | st->use_timer = 0; | |
571 | } | |
572 | return WORK_FINISHED_CONTINUE; | |
573 | ||
574 | case TLS_ST_OK: | |
575 | return tls_finish_handshake(s, wst); | |
576 | ||
577 | default: | |
578 | /* No pre work to be done */ | |
579 | break; | |
580 | } | |
581 | ||
582 | return WORK_FINISHED_CONTINUE; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Perform any work that needs to be done after sending a message from the | |
587 | * server to the client. | |
588 | */ | |
8481f583 | 589 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) |
61ae935a | 590 | { |
d6f1a6e9 | 591 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
592 | |
593 | s->init_num = 0; | |
594 | ||
595 | switch(st->hand_state) { | |
596 | case TLS_ST_SW_HELLO_REQ: | |
597 | if (statem_flush(s) != 1) | |
598 | return WORK_MORE_A; | |
599 | ssl3_init_finished_mac(s); | |
600 | break; | |
601 | ||
602 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
603 | if (statem_flush(s) != 1) | |
604 | return WORK_MORE_A; | |
605 | /* HelloVerifyRequest resets Finished MAC */ | |
606 | if (s->version != DTLS1_BAD_VER) | |
607 | ssl3_init_finished_mac(s); | |
608 | /* | |
609 | * The next message should be another ClientHello which we need to | |
610 | * treat like it was the first packet | |
611 | */ | |
612 | s->first_packet = 1; | |
613 | break; | |
614 | ||
615 | case TLS_ST_SW_SRVR_HELLO: | |
616 | #ifndef OPENSSL_NO_SCTP | |
617 | if (SSL_IS_DTLS(s) && s->hit) { | |
618 | unsigned char sctpauthkey[64]; | |
619 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
620 | ||
621 | /* | |
622 | * Add new shared key for SCTP-Auth, will be ignored if no | |
623 | * SCTP used. | |
624 | */ | |
141eb8c6 MC |
625 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
626 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
627 | |
628 | if (SSL_export_keying_material(s, sctpauthkey, | |
629 | sizeof(sctpauthkey), labelbuffer, | |
630 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 631 | ossl_statem_set_error(s); |
61ae935a MC |
632 | return WORK_ERROR; |
633 | } | |
634 | ||
635 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
636 | sizeof(sctpauthkey), sctpauthkey); | |
637 | } | |
638 | #endif | |
639 | break; | |
640 | ||
641 | case TLS_ST_SW_CHANGE: | |
642 | #ifndef OPENSSL_NO_SCTP | |
643 | if (SSL_IS_DTLS(s) && !s->hit) { | |
644 | /* | |
645 | * Change to new shared key of SCTP-Auth, will be ignored if | |
646 | * no SCTP used. | |
647 | */ | |
648 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
649 | 0, NULL); | |
650 | } | |
651 | #endif | |
652 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
653 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { | |
fe3a3291 | 654 | ossl_statem_set_error(s); |
61ae935a MC |
655 | return WORK_ERROR; |
656 | } | |
657 | ||
658 | if (SSL_IS_DTLS(s)) | |
659 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
660 | break; | |
661 | ||
662 | case TLS_ST_SW_SRVR_DONE: | |
663 | if (statem_flush(s) != 1) | |
664 | return WORK_MORE_A; | |
665 | break; | |
666 | ||
667 | case TLS_ST_SW_FINISHED: | |
668 | if (statem_flush(s) != 1) | |
669 | return WORK_MORE_A; | |
670 | #ifndef OPENSSL_NO_SCTP | |
671 | if (SSL_IS_DTLS(s) && s->hit) { | |
672 | /* | |
673 | * Change to new shared key of SCTP-Auth, will be ignored if | |
674 | * no SCTP used. | |
675 | */ | |
676 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
677 | 0, NULL); | |
678 | } | |
679 | #endif | |
680 | break; | |
681 | ||
682 | default: | |
683 | /* No post work to be done */ | |
684 | break; | |
685 | } | |
686 | ||
687 | return WORK_FINISHED_CONTINUE; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Construct a message to be sent from the server to the client. | |
692 | * | |
693 | * Valid return values are: | |
694 | * 1: Success | |
695 | * 0: Error | |
696 | */ | |
8481f583 | 697 | int ossl_statem_server_construct_message(SSL *s) |
61ae935a | 698 | { |
d6f1a6e9 | 699 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
700 | |
701 | switch(st->hand_state) { | |
702 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
703 | return dtls_construct_hello_verify_request(s); | |
704 | ||
705 | case TLS_ST_SW_HELLO_REQ: | |
706 | return tls_construct_hello_request(s); | |
707 | ||
708 | case TLS_ST_SW_SRVR_HELLO: | |
709 | return tls_construct_server_hello(s); | |
710 | ||
711 | case TLS_ST_SW_CERT: | |
712 | return tls_construct_server_certificate(s); | |
713 | ||
714 | case TLS_ST_SW_KEY_EXCH: | |
715 | return tls_construct_server_key_exchange(s); | |
716 | ||
717 | case TLS_ST_SW_CERT_REQ: | |
718 | return tls_construct_certificate_request(s); | |
719 | ||
720 | case TLS_ST_SW_SRVR_DONE: | |
721 | return tls_construct_server_done(s); | |
722 | ||
723 | case TLS_ST_SW_SESSION_TICKET: | |
724 | return tls_construct_new_session_ticket(s); | |
725 | ||
726 | case TLS_ST_SW_CERT_STATUS: | |
727 | return tls_construct_cert_status(s); | |
728 | ||
729 | case TLS_ST_SW_CHANGE: | |
730 | if (SSL_IS_DTLS(s)) | |
731 | return dtls_construct_change_cipher_spec(s); | |
732 | else | |
733 | return tls_construct_change_cipher_spec(s); | |
734 | ||
735 | case TLS_ST_SW_FINISHED: | |
736 | return tls_construct_finished(s, | |
737 | s->method-> | |
738 | ssl3_enc->server_finished_label, | |
739 | s->method-> | |
740 | ssl3_enc->server_finished_label_len); | |
741 | ||
742 | default: | |
743 | /* Shouldn't happen */ | |
744 | break; | |
745 | } | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 | |
751 | #define NEXT_PROTO_MAX_LENGTH 514 | |
752 | ||
753 | /* | |
754 | * Returns the maximum allowed length for the current message that we are | |
755 | * reading. Excludes the message header. | |
756 | */ | |
8481f583 | 757 | unsigned long ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 758 | { |
d6f1a6e9 | 759 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
760 | |
761 | switch(st->hand_state) { | |
762 | case TLS_ST_SR_CLNT_HELLO: | |
763 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
764 | ||
765 | case TLS_ST_SR_CERT: | |
766 | return s->max_cert_list; | |
767 | ||
768 | case TLS_ST_SR_KEY_EXCH: | |
769 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
770 | ||
771 | case TLS_ST_SR_CERT_VRFY: | |
772 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
773 | ||
774 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
775 | case TLS_ST_SR_NEXT_PROTO: | |
776 | return NEXT_PROTO_MAX_LENGTH; | |
777 | #endif | |
778 | ||
779 | case TLS_ST_SR_CHANGE: | |
780 | return CCS_MAX_LENGTH; | |
781 | ||
782 | case TLS_ST_SR_FINISHED: | |
783 | return FINISHED_MAX_LENGTH; | |
784 | ||
785 | default: | |
786 | /* Shouldn't happen */ | |
787 | break; | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | /* | |
794 | * Process a message that the server has received from the client. | |
795 | */ | |
8481f583 | 796 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 797 | { |
d6f1a6e9 | 798 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
799 | |
800 | switch(st->hand_state) { | |
801 | case TLS_ST_SR_CLNT_HELLO: | |
802 | return tls_process_client_hello(s, pkt); | |
803 | ||
804 | case TLS_ST_SR_CERT: | |
805 | return tls_process_client_certificate(s, pkt); | |
806 | ||
807 | case TLS_ST_SR_KEY_EXCH: | |
808 | return tls_process_client_key_exchange(s, pkt); | |
809 | ||
810 | case TLS_ST_SR_CERT_VRFY: | |
811 | return tls_process_cert_verify(s, pkt); | |
812 | ||
813 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
814 | case TLS_ST_SR_NEXT_PROTO: | |
815 | return tls_process_next_proto(s, pkt); | |
816 | #endif | |
817 | ||
818 | case TLS_ST_SR_CHANGE: | |
819 | return tls_process_change_cipher_spec(s, pkt); | |
820 | ||
821 | case TLS_ST_SR_FINISHED: | |
822 | return tls_process_finished(s, pkt); | |
823 | ||
824 | default: | |
825 | /* Shouldn't happen */ | |
826 | break; | |
827 | } | |
828 | ||
829 | return MSG_PROCESS_ERROR; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Perform any further processing required following the receipt of a message | |
834 | * from the client | |
835 | */ | |
8481f583 | 836 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 837 | { |
d6f1a6e9 | 838 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
839 | |
840 | switch(st->hand_state) { | |
841 | case TLS_ST_SR_CLNT_HELLO: | |
842 | return tls_post_process_client_hello(s, wst); | |
843 | ||
844 | case TLS_ST_SR_KEY_EXCH: | |
845 | return tls_post_process_client_key_exchange(s, wst); | |
846 | ||
847 | case TLS_ST_SR_CERT_VRFY: | |
848 | #ifndef OPENSSL_NO_SCTP | |
849 | if ( /* Is this SCTP? */ | |
850 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
851 | /* Are we renegotiating? */ | |
852 | && s->renegotiate | |
853 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
854 | s->s3->in_read_app_data = 2; | |
855 | s->rwstate = SSL_READING; | |
856 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
857 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 858 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
859 | return WORK_MORE_A; |
860 | } else { | |
d99b0691 | 861 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
862 | } |
863 | #endif | |
864 | return WORK_FINISHED_CONTINUE; | |
865 | ||
61ae935a MC |
866 | default: |
867 | break; | |
868 | } | |
869 | ||
870 | /* Shouldn't happen */ | |
871 | return WORK_ERROR; | |
872 | } | |
873 | ||
edc032b5 | 874 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 875 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
876 | { |
877 | int ret = SSL_ERROR_NONE; | |
878 | ||
879 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
880 | ||
881 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
882 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
883 | if (s->srp_ctx.login == NULL) { | |
884 | /* | |
885 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
886 | * login name | |
887 | */ | |
888 | ret = SSL3_AL_FATAL; | |
889 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
890 | } else { | |
891 | ret = SSL_srp_server_param_with_username(s, al); | |
892 | } | |
893 | } | |
894 | return ret; | |
895 | } | |
edc032b5 BL |
896 | #endif |
897 | ||
e27f234a MC |
898 | int tls_construct_hello_request(SSL *s) |
899 | { | |
900 | if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) { | |
901 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 902 | ossl_statem_set_error(s); |
e27f234a MC |
903 | return 0; |
904 | } | |
905 | ||
906 | return 1; | |
907 | } | |
908 | ||
8ba708e5 MC |
909 | unsigned int dtls_raw_hello_verify_request(unsigned char *buf, |
910 | unsigned char *cookie, | |
911 | unsigned char cookie_len) | |
912 | { | |
913 | unsigned int msg_len; | |
914 | unsigned char *p; | |
915 | ||
916 | p = buf; | |
917 | /* Always use DTLS 1.0 version: see RFC 6347 */ | |
918 | *(p++) = DTLS1_VERSION >> 8; | |
919 | *(p++) = DTLS1_VERSION & 0xFF; | |
920 | ||
921 | *(p++) = (unsigned char)cookie_len; | |
922 | memcpy(p, cookie, cookie_len); | |
923 | p += cookie_len; | |
924 | msg_len = p - buf; | |
925 | ||
926 | return msg_len; | |
927 | } | |
928 | ||
929 | int dtls_construct_hello_verify_request(SSL *s) | |
930 | { | |
931 | unsigned int len; | |
932 | unsigned char *buf; | |
933 | ||
934 | buf = (unsigned char *)s->init_buf->data; | |
935 | ||
936 | if (s->ctx->app_gen_cookie_cb == NULL || | |
937 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
938 | &(s->d1->cookie_len)) == 0 || | |
939 | s->d1->cookie_len > 255) { | |
f0659bdb | 940 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 941 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
fe3a3291 | 942 | ossl_statem_set_error(s); |
8ba708e5 MC |
943 | return 0; |
944 | } | |
945 | ||
946 | len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH], | |
947 | s->d1->cookie, s->d1->cookie_len); | |
948 | ||
a773b52a | 949 | dtls1_set_message_header(s, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, |
8ba708e5 MC |
950 | len); |
951 | len += DTLS1_HM_HEADER_LENGTH; | |
952 | ||
953 | /* number of bytes to write */ | |
954 | s->init_num = len; | |
955 | s->init_off = 0; | |
956 | ||
957 | return 1; | |
958 | } | |
959 | ||
be3583fa | 960 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
961 | { |
962 | int i, al = SSL_AD_INTERNAL_ERROR; | |
963 | unsigned int j, complen = 0; | |
964 | unsigned long id; | |
4a640fb6 | 965 | const SSL_CIPHER *c; |
e27f234a MC |
966 | #ifndef OPENSSL_NO_COMP |
967 | SSL_COMP *comp = NULL; | |
968 | #endif | |
969 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
4fa52141 | 970 | int protverr; |
e27f234a | 971 | /* |cookie| will only be initialized for DTLS. */ |
73999b62 | 972 | PACKET session_id, cipher_suites, compression, extensions, cookie; |
e27f234a MC |
973 | int is_v2_record; |
974 | ||
b3e2272c EK |
975 | is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
976 | ||
bbafa47b | 977 | PACKET_null_init(&cookie); |
32ec4153 | 978 | /* First lets get s->client_version set correctly */ |
b3e2272c | 979 | if (is_v2_record) { |
9ceb2426 MC |
980 | unsigned int version; |
981 | unsigned int mt; | |
32ec4153 MC |
982 | /*- |
983 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
984 | * header is sent directly on the wire, not wrapped as a TLS | |
985 | * record. Our record layer just processes the message length and passes | |
986 | * the rest right through. Its format is: | |
987 | * Byte Content | |
988 | * 0-1 msg_length - decoded by the record layer | |
989 | * 2 msg_type - s->init_msg points here | |
990 | * 3-4 version | |
991 | * 5-6 cipher_spec_length | |
992 | * 7-8 session_id_length | |
993 | * 9-10 challenge_length | |
994 | * ... ... | |
995 | */ | |
996 | ||
73999b62 | 997 | if (!PACKET_get_1(pkt, &mt) |
9ceb2426 | 998 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
999 | /* |
1000 | * Should never happen. We should have tested this in the record | |
1001 | * layer in order to have determined that this is a SSLv2 record | |
1002 | * in the first place | |
1003 | */ | |
e27f234a | 1004 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 1005 | goto err; |
32ec4153 MC |
1006 | } |
1007 | ||
73999b62 | 1008 | if (!PACKET_get_net_2(pkt, &version)) { |
9ceb2426 | 1009 | /* No protocol version supplied! */ |
e27f234a | 1010 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
9ceb2426 MC |
1011 | goto err; |
1012 | } | |
1013 | if (version == 0x0002) { | |
32ec4153 | 1014 | /* This is real SSLv2. We don't support it. */ |
e27f234a | 1015 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1016 | goto err; |
9ceb2426 | 1017 | } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) { |
32ec4153 | 1018 | /* SSLv3/TLS */ |
9ceb2426 | 1019 | s->client_version = version; |
32ec4153 MC |
1020 | } else { |
1021 | /* No idea what protocol this is */ | |
e27f234a | 1022 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 MC |
1023 | goto err; |
1024 | } | |
1025 | } else { | |
1026 | /* | |
9ceb2426 MC |
1027 | * use version from inside client hello, not from record header (may |
1028 | * differ: see RFC 2246, Appendix E, second paragraph) | |
32ec4153 | 1029 | */ |
73999b62 | 1030 | if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) { |
32ec4153 | 1031 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 1032 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); |
32ec4153 MC |
1033 | goto f_err; |
1034 | } | |
5e9f0eeb MC |
1035 | } |
1036 | ||
4fa52141 VD |
1037 | /* |
1038 | * Do SSL/TLS version negotiation if applicable. For DTLS we just check | |
1039 | * versions are potentially compatible. Version negotiation comes later. | |
1040 | */ | |
32ec4153 | 1041 | if (!SSL_IS_DTLS(s)) { |
4fa52141 VD |
1042 | protverr = ssl_choose_server_version(s); |
1043 | } else if (s->method->version != DTLS_ANY_VERSION && | |
1044 | DTLS_VERSION_LT(s->client_version, s->version)) { | |
1045 | protverr = SSL_R_VERSION_TOO_LOW; | |
1046 | } else { | |
32ec4153 MC |
1047 | protverr = 0; |
1048 | } | |
1049 | ||
1050 | if (protverr) { | |
4fa52141 | 1051 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); |
32ec4153 | 1052 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
1053 | /* |
1054 | * similar to ssl3_get_record, send alert using remote version | |
1055 | * number | |
1056 | */ | |
1057 | s->version = s->client_version; | |
1058 | } | |
1059 | al = SSL_AD_PROTOCOL_VERSION; | |
1060 | goto f_err; | |
1061 | } | |
1062 | ||
b3e2272c EK |
1063 | /* Parse the message and load client random. */ |
1064 | if (is_v2_record) { | |
32ec4153 MC |
1065 | /* |
1066 | * Handle an SSLv2 backwards compatible ClientHello | |
1067 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1068 | * Real SSLv2 is not supported, and is rejected above. | |
1069 | */ | |
ec30e856 | 1070 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1071 | PACKET challenge; |
0f113f3e | 1072 | |
73999b62 MC |
1073 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1074 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1075 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1076 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1077 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1078 | al = SSL_AD_DECODE_ERROR; |
1079 | goto f_err; | |
5e9f0eeb | 1080 | } |
0f113f3e | 1081 | |
293b5ca4 AG |
1082 | if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
1083 | al = SSL_AD_DECODE_ERROR; | |
1084 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1085 | goto f_err; | |
1086 | } | |
1087 | ||
73999b62 MC |
1088 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1089 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1090 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1091 | /* No extensions. */ |
73999b62 | 1092 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1093 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1094 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1095 | al = SSL_AD_DECODE_ERROR; |
1096 | goto f_err; | |
1097 | } | |
1098 | ||
32ec4153 | 1099 | /* Load the client random */ |
b3e2272c EK |
1100 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1101 | challenge_len; | |
32ec4153 | 1102 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1103 | if (!PACKET_copy_bytes(&challenge, |
1104 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
1105 | challenge_len, challenge_len)) { | |
f0659bdb | 1106 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1107 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1108 | goto f_err; |
1109 | } | |
b3e2272c EK |
1110 | |
1111 | PACKET_null_init(&compression); | |
1112 | PACKET_null_init(&extensions); | |
0f113f3e | 1113 | } else { |
b3e2272c | 1114 | /* Regular ClientHello. */ |
73999b62 MC |
1115 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1116 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1117 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1118 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1119 | goto f_err; |
1120 | } | |
32ec4153 | 1121 | |
293b5ca4 AG |
1122 | if (PACKET_remaining(&session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
1123 | al = SSL_AD_DECODE_ERROR; | |
1124 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1125 | goto f_err; | |
1126 | } | |
1127 | ||
b3e2272c | 1128 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1129 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1130 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1131 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1132 | goto f_err; |
1133 | } | |
b3e2272c EK |
1134 | /* |
1135 | * If we require cookies and this ClientHello doesn't contain one, | |
1136 | * just return since we do not want to allocate any memory yet. | |
1137 | * So check cookie length... | |
1138 | */ | |
1139 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1140 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1141 | return 1; |
b3e2272c | 1142 | } |
5e9f0eeb | 1143 | } |
0f113f3e | 1144 | |
73999b62 MC |
1145 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1146 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c | 1147 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1148 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
b3e2272c EK |
1149 | goto f_err; |
1150 | } | |
1151 | /* Could be empty. */ | |
73999b62 | 1152 | extensions = *pkt; |
b3e2272c EK |
1153 | } |
1154 | ||
1ed65871 DB |
1155 | if (SSL_IS_DTLS(s)) { |
1156 | /* Empty cookie was already handled above by returning early. */ | |
1157 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1158 | if (s->ctx->app_verify_cookie_cb != NULL) { | |
1159 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), | |
1160 | PACKET_remaining(&cookie)) == 0) { | |
1161 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1162 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, | |
1163 | SSL_R_COOKIE_MISMATCH); | |
1164 | goto f_err; | |
1165 | /* else cookie verification succeeded */ | |
1166 | } | |
1167 | /* default verification */ | |
1168 | } else if (!PACKET_equal(&cookie, s->d1->cookie, | |
1169 | s->d1->cookie_len)) { | |
1170 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1171 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); | |
1172 | goto f_err; | |
1173 | } | |
1174 | s->d1->cookie_verified = 1; | |
1175 | } | |
1176 | if (s->method->version == DTLS_ANY_VERSION) { | |
1177 | protverr = ssl_choose_server_version(s); | |
1178 | if (protverr != 0) { | |
1179 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
1180 | s->version = s->client_version; | |
1181 | al = SSL_AD_PROTOCOL_VERSION; | |
1182 | goto f_err; | |
1183 | } | |
1184 | } | |
1185 | } | |
1186 | ||
b3e2272c EK |
1187 | s->hit = 0; |
1188 | ||
1189 | /* | |
1190 | * We don't allow resumption in a backwards compatible ClientHello. | |
1191 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1192 | * | |
1193 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1194 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1195 | * ignore resumption requests with flag | |
1196 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1197 | * than a change to default behavior so that applications relying on | |
1198 | * this for security won't even compile against older library versions). | |
1199 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1200 | * request renegotiation but not a new session (s->new_session remains | |
1201 | * unset): for servers, this essentially just means that the | |
1202 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1203 | * ignored. | |
1204 | */ | |
1205 | if (is_v2_record || | |
1206 | (s->new_session && | |
1207 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1208 | if (!ssl_get_new_session(s, 1)) | |
1209 | goto err; | |
1210 | } else { | |
1211 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1212 | /* |
b3e2272c EK |
1213 | * Only resume if the session's version matches the negotiated |
1214 | * version. | |
1215 | * RFC 5246 does not provide much useful advice on resumption | |
1216 | * with a different protocol version. It doesn't forbid it but | |
1217 | * the sanity of such behaviour would be questionable. | |
1218 | * In practice, clients do not accept a version mismatch and | |
1219 | * will abort the handshake with an error. | |
0f113f3e | 1220 | */ |
b3e2272c EK |
1221 | if (i == 1 && s->version == s->session->ssl_version) { |
1222 | /* previous session */ | |
1223 | s->hit = 1; | |
1224 | } else if (i == -1) { | |
1225 | goto err; | |
32ec4153 | 1226 | } else { |
b3e2272c EK |
1227 | /* i == 0 */ |
1228 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1229 | goto err; |
0f113f3e | 1230 | } |
b3e2272c | 1231 | } |
0f113f3e | 1232 | |
38a3cbfb EK |
1233 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1234 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1235 | goto f_err; |
1236 | } | |
5e9f0eeb | 1237 | |
b3e2272c EK |
1238 | /* If it is a hit, check that the cipher is in the list */ |
1239 | if (s->hit) { | |
1240 | j = 0; | |
1241 | id = s->session->cipher->id; | |
d02b48c6 | 1242 | |
413c4f45 | 1243 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1244 | fprintf(stderr, "client sent %d ciphers\n", |
1245 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1246 | #endif |
b3e2272c EK |
1247 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1248 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1249 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1250 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1251 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1252 | #endif |
b3e2272c EK |
1253 | if (c->id == id) { |
1254 | j = 1; | |
1255 | break; | |
32ec4153 | 1256 | } |
0f113f3e | 1257 | } |
b3e2272c | 1258 | if (j == 0) { |
ec30e856 | 1259 | /* |
b3e2272c EK |
1260 | * we need to have the cipher in the cipher list if we are asked |
1261 | * to reuse it | |
ec30e856 | 1262 | */ |
b3e2272c | 1263 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1264 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1265 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1266 | goto f_err; |
1267 | } | |
b3e2272c | 1268 | } |
9ceb2426 | 1269 | |
b3e2272c EK |
1270 | complen = PACKET_remaining(&compression); |
1271 | for (j = 0; j < complen; j++) { | |
1272 | if (PACKET_data(&compression)[j] == 0) | |
1273 | break; | |
0f113f3e | 1274 | } |
32ec4153 | 1275 | |
b3e2272c EK |
1276 | if (j >= complen) { |
1277 | /* no compress */ | |
1278 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1279 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1280 | goto f_err; |
1281 | } | |
f100b031 | 1282 | |
0f113f3e MC |
1283 | /* TLS extensions */ |
1284 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1285 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
f0659bdb | 1286 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
0f113f3e MC |
1287 | goto err; |
1288 | } | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Check if we want to use external pre-shared secret for this handshake | |
1293 | * for not reused session only. We need to generate server_random before | |
1294 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1295 | * processing to use it in key derivation. | |
1296 | */ | |
1297 | { | |
1298 | unsigned char *pos; | |
1299 | pos = s->s3->server_random; | |
1300 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1301 | goto f_err; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
4a640fb6 | 1306 | const SSL_CIPHER *pref_cipher = NULL; |
0f113f3e MC |
1307 | |
1308 | s->session->master_key_length = sizeof(s->session->master_key); | |
1309 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1310 | &s->session->master_key_length, ciphers, | |
1311 | &pref_cipher, | |
1312 | s->tls_session_secret_cb_arg)) { | |
1313 | s->hit = 1; | |
1314 | s->session->ciphers = ciphers; | |
1315 | s->session->verify_result = X509_V_OK; | |
1316 | ||
1317 | ciphers = NULL; | |
1318 | ||
1319 | /* check if some cipher was preferred by call back */ | |
1320 | pref_cipher = | |
1321 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1322 | s-> | |
1323 | session->ciphers, | |
1324 | SSL_get_ciphers | |
1325 | (s)); | |
1326 | if (pref_cipher == NULL) { | |
1327 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1328 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1329 | goto f_err; |
1330 | } | |
1331 | ||
1332 | s->session->cipher = pref_cipher; | |
25aaa98a | 1333 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1334 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1335 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1336 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1337 | } | |
1338 | } | |
58ece833 | 1339 | |
0f113f3e MC |
1340 | /* |
1341 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1342 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1343 | * algorithms from the client, starting at q. |
1344 | */ | |
1345 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1346 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1347 | /* This only happens if we have a cache hit */ |
1348 | if (s->session->compress_meth != 0) { | |
1349 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1350 | unsigned int k; |
0f113f3e MC |
1351 | /* Perform sanity checks on resumed compression algorithm */ |
1352 | /* Can't disable compression */ | |
1353 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1354 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1355 | SSL_R_INCONSISTENT_COMPRESSION); |
1356 | goto f_err; | |
1357 | } | |
1358 | /* Look for resumed compression method */ | |
1359 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1360 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1361 | if (comp_id == comp->id) { | |
1362 | s->s3->tmp.new_compression = comp; | |
1363 | break; | |
1364 | } | |
1365 | } | |
1366 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1367 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1368 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1369 | goto f_err; | |
1370 | } | |
1371 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1372 | for (k = 0; k < complen; k++) { |
ec30e856 | 1373 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1374 | break; |
1375 | } | |
9ceb2426 | 1376 | if (k >= complen) { |
0f113f3e | 1377 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1378 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
9f2a142b | 1379 | SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING); |
0f113f3e MC |
1380 | goto f_err; |
1381 | } | |
1382 | } else if (s->hit) | |
1383 | comp = NULL; | |
1384 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1385 | /* See if we have a match */ |
9ceb2426 MC |
1386 | int m, nn, v, done = 0; |
1387 | unsigned int o; | |
0f113f3e MC |
1388 | |
1389 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1390 | for (m = 0; m < nn; m++) { | |
1391 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1392 | v = comp->id; | |
b2ce0337 | 1393 | for (o = 0; o < complen; o++) { |
ec30e856 | 1394 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1395 | done = 1; |
1396 | break; | |
1397 | } | |
1398 | } | |
1399 | if (done) | |
1400 | break; | |
1401 | } | |
1402 | if (done) | |
1403 | s->s3->tmp.new_compression = comp; | |
1404 | else | |
1405 | comp = NULL; | |
1406 | } | |
e6f418bc | 1407 | #else |
0f113f3e MC |
1408 | /* |
1409 | * If compression is disabled we'd better not try to resume a session | |
1410 | * using compression. | |
1411 | */ | |
1412 | if (s->session->compress_meth != 0) { | |
e27f234a | 1413 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1414 | goto f_err; |
1415 | } | |
09b6c2ef | 1416 | #endif |
413c4f45 | 1417 | |
0f113f3e MC |
1418 | /* |
1419 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1420 | */ | |
d02b48c6 | 1421 | |
0f113f3e | 1422 | if (!s->hit) { |
09b6c2ef | 1423 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1424 | s->session->compress_meth = 0; |
09b6c2ef | 1425 | #else |
0f113f3e | 1426 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1427 | #endif |
25aaa98a | 1428 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1429 | s->session->ciphers = ciphers; |
1430 | if (ciphers == NULL) { | |
3ae91cfb | 1431 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1432 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1433 | goto f_err; |
1434 | } | |
1435 | ciphers = NULL; | |
1436 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1437 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1438 | goto err; |
1439 | } | |
e27f234a MC |
1440 | } |
1441 | ||
1442 | sk_SSL_CIPHER_free(ciphers); | |
1443 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1444 | f_err: | |
1445 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1446 | err: | |
fe3a3291 | 1447 | ossl_statem_set_error(s); |
e27f234a MC |
1448 | |
1449 | sk_SSL_CIPHER_free(ciphers); | |
1450 | return MSG_PROCESS_ERROR; | |
1451 | ||
1452 | } | |
1453 | ||
be3583fa | 1454 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1455 | { |
d13dd4be | 1456 | int al = SSL_AD_HANDSHAKE_FAILURE; |
4a640fb6 | 1457 | const SSL_CIPHER *cipher; |
e27f234a MC |
1458 | |
1459 | if (wst == WORK_MORE_A) { | |
1460 | if (!s->hit) { | |
1461 | /* Let cert callback update server certificates if required */ | |
1462 | if (s->cert->cert_cb) { | |
1463 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1464 | if (rv == 0) { | |
1465 | al = SSL_AD_INTERNAL_ERROR; | |
1466 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1467 | goto f_err; | |
1468 | } | |
1469 | if (rv < 0) { | |
1470 | s->rwstate = SSL_X509_LOOKUP; | |
1471 | return WORK_MORE_A; | |
1472 | } | |
1473 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1474 | } |
e27f234a MC |
1475 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1476 | ||
1477 | if (cipher == NULL) { | |
e27f234a MC |
1478 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
1479 | goto f_err; | |
0f113f3e | 1480 | } |
e27f234a MC |
1481 | s->s3->tmp.new_cipher = cipher; |
1482 | /* check whether we should disable session resumption */ | |
1483 | if (s->not_resumable_session_cb != NULL) | |
1484 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1485 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1486 | if (s->session->not_resumable) | |
1487 | /* do not send a session ticket */ | |
1488 | s->tlsext_ticket_expected = 0; | |
1489 | } else { | |
1490 | /* Session-id reuse */ | |
1491 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1492 | } |
0f113f3e | 1493 | |
28f4580c | 1494 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1495 | if (!ssl3_digest_cached_records(s, 0)) { |
1496 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1497 | goto f_err; |
d13dd4be | 1498 | } |
0f113f3e | 1499 | } |
0f113f3e | 1500 | |
e27f234a MC |
1501 | /*- |
1502 | * we now have the following setup. | |
1503 | * client_random | |
1504 | * cipher_list - our prefered list of ciphers | |
1505 | * ciphers - the clients prefered list of ciphers | |
1506 | * compression - basically ignored right now | |
1507 | * ssl version is set - sslv3 | |
1508 | * s->session - The ssl session has been setup. | |
1509 | * s->hit - session reuse flag | |
1510 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1511 | */ | |
0f113f3e | 1512 | |
e27f234a MC |
1513 | /* Handles TLS extensions that we couldn't check earlier */ |
1514 | if (s->version >= SSL3_VERSION) { | |
1515 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
d13dd4be MC |
1516 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1517 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1518 | goto f_err; |
1519 | } | |
1520 | } | |
0f113f3e | 1521 | |
e27f234a MC |
1522 | wst = WORK_MORE_B; |
1523 | } | |
1524 | #ifndef OPENSSL_NO_SRP | |
1525 | if (wst == WORK_MORE_B) { | |
1526 | int ret; | |
1527 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1528 | /* | |
1529 | * callback indicates further work to be done | |
1530 | */ | |
1531 | s->rwstate = SSL_X509_LOOKUP; | |
1532 | return WORK_MORE_B; | |
1533 | } | |
1534 | if (ret != SSL_ERROR_NONE) { | |
1535 | /* | |
1536 | * This is not really an error but the only means to for | |
1537 | * a client to detect whether srp is supported. | |
1538 | */ | |
1539 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1540 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1541 | SSL_R_CLIENTHELLO_TLSEXT); | |
1542 | goto f_err; | |
0f113f3e MC |
1543 | } |
1544 | } | |
e27f234a MC |
1545 | #endif |
1546 | s->renegotiate = 2; | |
0f113f3e | 1547 | |
e27f234a | 1548 | return WORK_FINISHED_STOP; |
0f113f3e | 1549 | f_err: |
e27f234a | 1550 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1551 | ossl_statem_set_error(s); |
e27f234a MC |
1552 | return WORK_ERROR; |
1553 | } | |
1554 | ||
e27f234a | 1555 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1556 | { |
1557 | unsigned char *buf; | |
1558 | unsigned char *p, *d; | |
1559 | int i, sl; | |
1560 | int al = 0; | |
1561 | unsigned long l; | |
1562 | ||
e27f234a | 1563 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1564 | |
e27f234a MC |
1565 | /* Do the message type and length last */ |
1566 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1567 | |
e27f234a MC |
1568 | *(p++) = s->version >> 8; |
1569 | *(p++) = s->version & 0xff; | |
0f113f3e | 1570 | |
e27f234a MC |
1571 | /* |
1572 | * Random stuff. Filling of the server_random takes place in | |
1573 | * tls_process_client_hello() | |
1574 | */ | |
1575 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1576 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1577 | |
e27f234a MC |
1578 | /*- |
1579 | * There are several cases for the session ID to send | |
1580 | * back in the server hello: | |
1581 | * - For session reuse from the session cache, | |
1582 | * we send back the old session ID. | |
1583 | * - If stateless session reuse (using a session ticket) | |
1584 | * is successful, we send back the client's "session ID" | |
1585 | * (which doesn't actually identify the session). | |
1586 | * - If it is a new session, we send back the new | |
1587 | * session ID. | |
1588 | * - However, if we want the new session to be single-use, | |
1589 | * we send back a 0-length session ID. | |
1590 | * s->hit is non-zero in either case of session reuse, | |
1591 | * so the following won't overwrite an ID that we're supposed | |
1592 | * to send back. | |
1593 | */ | |
1594 | if (s->session->not_resumable || | |
1595 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1596 | && !s->hit)) | |
1597 | s->session->session_id_length = 0; | |
1598 | ||
1599 | sl = s->session->session_id_length; | |
1600 | if (sl > (int)sizeof(s->session->session_id)) { | |
1601 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1602 | ossl_statem_set_error(s); |
e27f234a MC |
1603 | return 0; |
1604 | } | |
1605 | *(p++) = sl; | |
1606 | memcpy(p, s->session->session_id, sl); | |
1607 | p += sl; | |
0f113f3e | 1608 | |
e27f234a MC |
1609 | /* put the cipher */ |
1610 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1611 | p += i; | |
0f113f3e | 1612 | |
e27f234a | 1613 | /* put the compression method */ |
09b6c2ef | 1614 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1615 | *(p++) = 0; |
09b6c2ef | 1616 | #else |
e27f234a MC |
1617 | if (s->s3->tmp.new_compression == NULL) |
1618 | *(p++) = 0; | |
1619 | else | |
1620 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1621 | #endif |
e481f9b9 | 1622 | |
e27f234a MC |
1623 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1624 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1625 | ossl_statem_set_error(s); |
e27f234a MC |
1626 | return 0; |
1627 | } | |
1628 | if ((p = | |
1629 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1630 | &al)) == NULL) { | |
1631 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1632 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1633 | ossl_statem_set_error(s); |
e27f234a MC |
1634 | return 0; |
1635 | } | |
e481f9b9 | 1636 | |
e27f234a MC |
1637 | /* do the header */ |
1638 | l = (p - d); | |
1639 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1640 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1641 | ossl_statem_set_error(s); |
e27f234a | 1642 | return 0; |
0f113f3e | 1643 | } |
d02b48c6 | 1644 | |
e27f234a | 1645 | return 1; |
0f113f3e | 1646 | } |
d02b48c6 | 1647 | |
e27f234a MC |
1648 | int tls_construct_server_done(SSL *s) |
1649 | { | |
1650 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1651 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1652 | ossl_statem_set_error(s); |
e27f234a MC |
1653 | return 0; |
1654 | } | |
1655 | ||
1656 | if (!s->s3->tmp.cert_request) { | |
1657 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1658 | ossl_statem_set_error(s); |
e27f234a MC |
1659 | } |
1660 | } | |
1661 | ||
1662 | return 1; | |
1663 | } | |
1664 | ||
e27f234a | 1665 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1666 | { |
bc36ee62 | 1667 | #ifndef OPENSSL_NO_DH |
e2b420fd | 1668 | EVP_PKEY *pkdh = NULL; |
ea262260 | 1669 | #endif |
10bf4fc2 | 1670 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1671 | unsigned char *encodedPoint = NULL; |
1672 | int encodedlen = 0; | |
1673 | int curve_id = 0; | |
d02b48c6 | 1674 | #endif |
0f113f3e MC |
1675 | EVP_PKEY *pkey; |
1676 | const EVP_MD *md = NULL; | |
1677 | unsigned char *p, *d; | |
1678 | int al, i; | |
1679 | unsigned long type; | |
1680 | int n; | |
0f113f3e MC |
1681 | BIGNUM *r[4]; |
1682 | int nr[4], kn; | |
1683 | BUF_MEM *buf; | |
bfb0641f | 1684 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
0f113f3e | 1685 | |
6e59a892 RL |
1686 | if (md_ctx == NULL) { |
1687 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
1688 | al = SSL_AD_INTERNAL_ERROR; | |
1689 | goto f_err; | |
1690 | } | |
0f113f3e | 1691 | |
e27f234a | 1692 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a MC |
1693 | |
1694 | buf = s->init_buf; | |
0f113f3e | 1695 | |
e27f234a MC |
1696 | r[0] = r[1] = r[2] = r[3] = NULL; |
1697 | n = 0; | |
85269210 | 1698 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1699 | if (type & SSL_PSK) { |
1700 | /* | |
1701 | * reserve size for record length and PSK identity hint | |
1702 | */ | |
1703 | n += 2; | |
1704 | if (s->cert->psk_identity_hint) | |
1705 | n += strlen(s->cert->psk_identity_hint); | |
1706 | } | |
1707 | /* Plain PSK or RSAPSK nothing to do */ | |
1708 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1709 | } else | |
85269210 | 1710 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1711 | #ifndef OPENSSL_NO_DH |
e27f234a | 1712 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
1713 | CERT *cert = s->cert; |
1714 | ||
e2b420fd DSH |
1715 | EVP_PKEY *pkdhp = NULL; |
1716 | DH *dh; | |
1717 | ||
e27f234a | 1718 | if (s->cert->dh_tmp_auto) { |
e2b420fd DSH |
1719 | DH *dhp = ssl_get_auto_dh(s); |
1720 | pkdh = EVP_PKEY_new(); | |
1721 | if (pkdh == NULL || dhp == NULL) { | |
1722 | DH_free(dhp); | |
e27f234a MC |
1723 | al = SSL_AD_INTERNAL_ERROR; |
1724 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1725 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1726 | goto f_err; |
0f113f3e | 1727 | } |
e2b420fd DSH |
1728 | EVP_PKEY_assign_DH(pkdh, dhp); |
1729 | pkdhp = pkdh; | |
1730 | } else { | |
1731 | pkdhp = cert->dh_tmp; | |
1732 | } | |
1733 | if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { | |
1734 | DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); | |
1735 | pkdh = ssl_dh_to_pkey(dhp); | |
1736 | if (pkdh == NULL) { | |
1737 | al = SSL_AD_INTERNAL_ERROR; | |
1738 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1739 | ERR_R_INTERNAL_ERROR); | |
1740 | goto f_err; | |
1741 | } | |
1742 | pkdhp = pkdh; | |
1743 | } | |
1744 | if (pkdhp == NULL) { | |
e27f234a MC |
1745 | al = SSL_AD_HANDSHAKE_FAILURE; |
1746 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1747 | SSL_R_MISSING_TMP_DH_KEY); | |
1748 | goto f_err; | |
1749 | } | |
1750 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
e2b420fd | 1751 | EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { |
e27f234a MC |
1752 | al = SSL_AD_HANDSHAKE_FAILURE; |
1753 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1754 | SSL_R_DH_KEY_TOO_SMALL); | |
1755 | goto f_err; | |
1756 | } | |
e2b420fd | 1757 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1758 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1759 | ERR_R_INTERNAL_ERROR); | |
1760 | goto err; | |
1761 | } | |
0f113f3e | 1762 | |
e2b420fd | 1763 | s->s3->tmp.pkey = ssl_generate_pkey(pkdhp, NID_undef); |
e27f234a | 1764 | |
e2b420fd DSH |
1765 | if (s->s3->tmp.pkey == NULL) { |
1766 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
ffaef3f1 | 1767 | goto err; |
e27f234a | 1768 | } |
e2b420fd DSH |
1769 | |
1770 | dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); | |
1771 | ||
1772 | EVP_PKEY_free(pkdh); | |
1773 | pkdh = NULL; | |
1774 | ||
e27f234a MC |
1775 | r[0] = dh->p; |
1776 | r[1] = dh->g; | |
1777 | r[2] = dh->pub_key; | |
1778 | } else | |
d02b48c6 | 1779 | #endif |
10bf4fc2 | 1780 | #ifndef OPENSSL_NO_EC |
e27f234a | 1781 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 1782 | int nid; |
e27f234a | 1783 | |
880d9d86 | 1784 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1785 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1786 | ERR_R_INTERNAL_ERROR); | |
1787 | goto err; | |
1788 | } | |
1789 | ||
57be4444 DSH |
1790 | /* Get NID of appropriate shared curve */ |
1791 | nid = tls1_shared_curve(s, -2); | |
1792 | curve_id = tls1_ec_nid2curve_id(nid); | |
1793 | if (curve_id == 0) { | |
e27f234a MC |
1794 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1795 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1796 | goto err; | |
1797 | } | |
880d9d86 DSH |
1798 | s->s3->tmp.pkey = ssl_generate_pkey(NULL, nid); |
1799 | /* Generate a new key for this curve */ | |
1800 | if (s->s3->tmp.pkey == NULL) { | |
57be4444 | 1801 | al = SSL_AD_INTERNAL_ERROR; |
880d9d86 | 1802 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
1803 | goto f_err; |
1804 | } | |
1805 | ||
880d9d86 DSH |
1806 | /* Encode the public key. */ |
1807 | encodedlen = EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(s->s3->tmp.pkey), | |
1808 | POINT_CONVERSION_UNCOMPRESSED, | |
cae41364 | 1809 | &encodedPoint, NULL); |
0f113f3e | 1810 | |
e27f234a | 1811 | if (encodedlen == 0) { |
cae41364 | 1812 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
1813 | goto err; |
1814 | } | |
0f113f3e | 1815 | |
e27f234a | 1816 | /* |
57be4444 DSH |
1817 | * We only support named (not generic) curves in ECDH ephemeral key |
1818 | * exchanges. In this situation, we need four additional bytes to | |
1819 | * encode the entire ServerECDHParams structure. | |
e27f234a MC |
1820 | */ |
1821 | n += 4 + encodedlen; | |
0f113f3e | 1822 | |
e27f234a MC |
1823 | /* |
1824 | * We'll generate the serverKeyExchange message explicitly so we | |
1825 | * can set these to NULLs | |
1826 | */ | |
1827 | r[0] = NULL; | |
1828 | r[1] = NULL; | |
1829 | r[2] = NULL; | |
1830 | r[3] = NULL; | |
1831 | } else | |
10bf4fc2 | 1832 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1833 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1834 | if (type & SSL_kSRP) { |
1835 | if ((s->srp_ctx.N == NULL) || | |
1836 | (s->srp_ctx.g == NULL) || | |
1837 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1838 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1839 | SSL_R_MISSING_SRP_PARAM); | |
1840 | goto err; | |
0f113f3e | 1841 | } |
e27f234a MC |
1842 | r[0] = s->srp_ctx.N; |
1843 | r[1] = s->srp_ctx.g; | |
1844 | r[2] = s->srp_ctx.s; | |
1845 | r[3] = s->srp_ctx.B; | |
1846 | } else | |
1847 | #endif | |
1848 | { | |
1849 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1850 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1851 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1852 | goto f_err; | |
1853 | } | |
1854 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
1855 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 1856 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1857 | if ((i == 2) && (type & SSL_kSRP)) |
1858 | n += 1 + nr[i]; | |
1859 | else | |
edc032b5 | 1860 | #endif |
e27f234a MC |
1861 | n += 2 + nr[i]; |
1862 | } | |
0f113f3e | 1863 | |
e27f234a MC |
1864 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
1865 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
1866 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1867 | == NULL) { | |
1868 | al = SSL_AD_DECODE_ERROR; | |
1869 | goto f_err; | |
0f113f3e | 1870 | } |
e27f234a MC |
1871 | kn = EVP_PKEY_size(pkey); |
1872 | } else { | |
1873 | pkey = NULL; | |
1874 | kn = 0; | |
1875 | } | |
0f113f3e | 1876 | |
e27f234a MC |
1877 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
1878 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
1879 | goto err; | |
1880 | } | |
1881 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1882 | |
85269210 | 1883 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1884 | if (type & SSL_PSK) { |
1885 | /* copy PSK identity hint */ | |
1886 | if (s->cert->psk_identity_hint) { | |
1887 | s2n(strlen(s->cert->psk_identity_hint), p); | |
1888 | strncpy((char *)p, s->cert->psk_identity_hint, | |
1889 | strlen(s->cert->psk_identity_hint)); | |
1890 | p += strlen(s->cert->psk_identity_hint); | |
1891 | } else { | |
1892 | s2n(0, p); | |
85269210 | 1893 | } |
e27f234a | 1894 | } |
85269210 DSH |
1895 | #endif |
1896 | ||
e27f234a | 1897 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 1898 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1899 | if ((i == 2) && (type & SSL_kSRP)) { |
1900 | *p = nr[i]; | |
1901 | p++; | |
1902 | } else | |
edc032b5 | 1903 | #endif |
e27f234a MC |
1904 | s2n(nr[i], p); |
1905 | BN_bn2bin(r[i], p); | |
1906 | p += nr[i]; | |
1907 | } | |
d02b48c6 | 1908 | |
10bf4fc2 | 1909 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1910 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1911 | /* | |
1912 | * XXX: For now, we only support named (not generic) curves. In | |
1913 | * this situation, the serverKeyExchange message has: [1 byte | |
1914 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
1915 | * point], followed by the actual encoded point itself | |
1916 | */ | |
1917 | *p = NAMED_CURVE_TYPE; | |
1918 | p += 1; | |
1919 | *p = 0; | |
1920 | p += 1; | |
1921 | *p = curve_id; | |
1922 | p += 1; | |
1923 | *p = encodedlen; | |
1924 | p += 1; | |
1925 | memcpy(p, encodedPoint, encodedlen); | |
1926 | OPENSSL_free(encodedPoint); | |
1927 | encodedPoint = NULL; | |
1928 | p += encodedlen; | |
1929 | } | |
ea262260 BM |
1930 | #endif |
1931 | ||
e27f234a MC |
1932 | /* not anonymous */ |
1933 | if (pkey != NULL) { | |
1934 | /* | |
1935 | * n is the length of the params, they start at &(d[4]) and p | |
1936 | * points to the space at the end. | |
1937 | */ | |
e27f234a MC |
1938 | if (md) { |
1939 | /* send signature algorithm */ | |
1940 | if (SSL_USE_SIGALGS(s)) { | |
1941 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
1942 | /* Should never happen */ | |
1943 | al = SSL_AD_INTERNAL_ERROR; | |
1944 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1945 | ERR_R_INTERNAL_ERROR); | |
1946 | goto f_err; | |
0f113f3e | 1947 | } |
e27f234a MC |
1948 | p += 2; |
1949 | } | |
a2f9200f | 1950 | #ifdef SSL_DEBUG |
e27f234a | 1951 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 1952 | #endif |
6e59a892 RL |
1953 | if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0 |
1954 | || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]), | |
5f3d93e4 | 1955 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 | 1956 | || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]), |
5f3d93e4 | 1957 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 RL |
1958 | || EVP_SignUpdate(md_ctx, d, n) <= 0 |
1959 | || EVP_SignFinal(md_ctx, &(p[2]), | |
5f3d93e4 | 1960 | (unsigned int *)&i, pkey) <= 0) { |
e27f234a | 1961 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); |
5f3d93e4 MC |
1962 | al = SSL_AD_INTERNAL_ERROR; |
1963 | goto f_err; | |
0f113f3e | 1964 | } |
e27f234a MC |
1965 | s2n(i, p); |
1966 | n += i + 2; | |
1967 | if (SSL_USE_SIGALGS(s)) | |
1968 | n += 2; | |
1969 | } else { | |
1970 | /* Is this error check actually needed? */ | |
77d514c5 | 1971 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1972 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1973 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
1974 | goto f_err; |
1975 | } | |
0f113f3e MC |
1976 | } |
1977 | ||
e27f234a MC |
1978 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
1979 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1980 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
1981 | goto f_err; | |
1982 | } | |
1983 | ||
bfb0641f | 1984 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 1985 | return 1; |
0f113f3e MC |
1986 | f_err: |
1987 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1988 | err: | |
e2b420fd DSH |
1989 | #ifndef OPENSSL_NO_DH |
1990 | EVP_PKEY_free(pkdh); | |
1991 | #endif | |
556efe79 | 1992 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 1993 | OPENSSL_free(encodedPoint); |
ea262260 | 1994 | #endif |
bfb0641f | 1995 | EVP_MD_CTX_free(md_ctx); |
fe3a3291 | 1996 | ossl_statem_set_error(s); |
e27f234a | 1997 | return 0; |
0f113f3e | 1998 | } |
d02b48c6 | 1999 | |
e27f234a | 2000 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
2001 | { |
2002 | unsigned char *p, *d; | |
2003 | int i, j, nl, off, n; | |
2004 | STACK_OF(X509_NAME) *sk = NULL; | |
2005 | X509_NAME *name; | |
2006 | BUF_MEM *buf; | |
2007 | ||
e27f234a | 2008 | buf = s->init_buf; |
0f113f3e | 2009 | |
e27f234a | 2010 | d = p = ssl_handshake_start(s); |
0f113f3e | 2011 | |
e27f234a MC |
2012 | /* get the list of acceptable cert types */ |
2013 | p++; | |
2014 | n = ssl3_get_req_cert_type(s, p); | |
2015 | d[0] = n; | |
2016 | p += n; | |
2017 | n++; | |
0f113f3e | 2018 | |
e27f234a MC |
2019 | if (SSL_USE_SIGALGS(s)) { |
2020 | const unsigned char *psigs; | |
2021 | unsigned char *etmp = p; | |
2022 | nl = tls12_get_psigalgs(s, &psigs); | |
2023 | /* Skip over length for now */ | |
0f113f3e | 2024 | p += 2; |
e27f234a MC |
2025 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
2026 | /* Now fill in length */ | |
2027 | s2n(nl, etmp); | |
2028 | p += nl; | |
2029 | n += nl + 2; | |
2030 | } | |
0f113f3e | 2031 | |
e27f234a MC |
2032 | off = n; |
2033 | p += 2; | |
2034 | n += 2; | |
2035 | ||
2036 | sk = SSL_get_client_CA_list(s); | |
2037 | nl = 0; | |
2038 | if (sk != NULL) { | |
2039 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
2040 | name = sk_X509_NAME_value(sk, i); | |
2041 | j = i2d_X509_NAME(name, NULL); | |
2042 | if (!BUF_MEM_grow_clean | |
2043 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
2044 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2045 | ERR_R_BUF_LIB); | |
2046 | goto err; | |
0f113f3e | 2047 | } |
e27f234a MC |
2048 | p = ssl_handshake_start(s) + n; |
2049 | s2n(j, p); | |
2050 | i2d_X509_NAME(name, &p); | |
2051 | n += 2 + j; | |
2052 | nl += 2 + j; | |
0f113f3e | 2053 | } |
e27f234a MC |
2054 | } |
2055 | /* else no CA names */ | |
2056 | p = ssl_handshake_start(s) + off; | |
2057 | s2n(nl, p); | |
d02b48c6 | 2058 | |
e27f234a MC |
2059 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2060 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2061 | goto err; | |
0f113f3e | 2062 | } |
d02b48c6 | 2063 | |
e27f234a MC |
2064 | s->s3->tmp.cert_request = 1; |
2065 | ||
2066 | return 1; | |
0f113f3e | 2067 | err: |
fe3a3291 | 2068 | ossl_statem_set_error(s); |
e27f234a | 2069 | return 0; |
0f113f3e | 2070 | } |
d02b48c6 | 2071 | |
be3583fa | 2072 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
e27f234a MC |
2073 | { |
2074 | int al; | |
0f113f3e | 2075 | unsigned long alg_k; |
bc36ee62 | 2076 | #ifndef OPENSSL_NO_RSA |
0f113f3e | 2077 | RSA *rsa = NULL; |
79df9d62 | 2078 | #endif |
b22d7113 | 2079 | #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) |
880d9d86 | 2080 | EVP_PKEY *ckey = NULL; |
ea262260 | 2081 | #endif |
73999b62 | 2082 | PACKET enc_premaster; |
b6981744 EK |
2083 | const unsigned char *data; |
2084 | unsigned char *rsa_decrypt = NULL; | |
ea262260 | 2085 | |
0f113f3e | 2086 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
d02b48c6 | 2087 | |
85269210 DSH |
2088 | #ifndef OPENSSL_NO_PSK |
2089 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2090 | if (alg_k & SSL_PSK) { | |
2091 | unsigned char psk[PSK_MAX_PSK_LEN]; | |
2092 | size_t psklen; | |
73999b62 | 2093 | PACKET psk_identity; |
efcdbcbe | 2094 | |
73999b62 | 2095 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
85269210 | 2096 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2097 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2098 | goto f_err; |
2099 | } | |
6d41fc80 | 2100 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { |
85269210 | 2101 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2102 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2103 | SSL_R_DATA_LENGTH_TOO_LONG); |
2104 | goto f_err; | |
2105 | } | |
2106 | if (s->psk_server_callback == NULL) { | |
2107 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2108 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2109 | SSL_R_PSK_NO_SERVER_CB); |
2110 | goto f_err; | |
2111 | } | |
2112 | ||
6d41fc80 | 2113 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
f0659bdb | 2114 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 | 2115 | al = SSL_AD_INTERNAL_ERROR; |
efcdbcbe MC |
2116 | goto f_err; |
2117 | } | |
85269210 DSH |
2118 | |
2119 | psklen = s->psk_server_callback(s, s->session->psk_identity, | |
2120 | psk, sizeof(psk)); | |
2121 | ||
2122 | if (psklen > PSK_MAX_PSK_LEN) { | |
2123 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2124 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2125 | goto f_err; |
2126 | } else if (psklen == 0) { | |
2127 | /* | |
2128 | * PSK related to the given identity not found | |
2129 | */ | |
e27f234a | 2130 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2131 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2132 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2133 | goto f_err; | |
2134 | } | |
2135 | ||
2136 | OPENSSL_free(s->s3->tmp.psk); | |
7644a9ae | 2137 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); |
85269210 DSH |
2138 | OPENSSL_cleanse(psk, psklen); |
2139 | ||
2140 | if (s->s3->tmp.psk == NULL) { | |
2141 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2142 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
85269210 DSH |
2143 | goto f_err; |
2144 | } | |
2145 | ||
2146 | s->s3->tmp.psklen = psklen; | |
85269210 DSH |
2147 | } |
2148 | if (alg_k & SSL_kPSK) { | |
2149 | /* Identity extracted earlier: should be nothing left */ | |
73999b62 | 2150 | if (PACKET_remaining(pkt) != 0) { |
85269210 | 2151 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2152 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2153 | goto f_err; |
2154 | } | |
2155 | /* PSK handled by ssl_generate_master_secret */ | |
2156 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
2157 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2158 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2159 | goto f_err; |
2160 | } | |
2161 | } else | |
2162 | #endif | |
bc36ee62 | 2163 | #ifndef OPENSSL_NO_RSA |
85269210 | 2164 | if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
0f113f3e MC |
2165 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2166 | int decrypt_len; | |
2167 | unsigned char decrypt_good, version_good; | |
2168 | size_t j; | |
2169 | ||
2170 | /* FIX THIS UP EAY EAY EAY EAY */ | |
3aeb9348 DSH |
2171 | rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey); |
2172 | if (rsa == NULL) { | |
361a1191 KR |
2173 | al = SSL_AD_HANDSHAKE_FAILURE; |
2174 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2175 | SSL_R_MISSING_RSA_CERTIFICATE); | |
2176 | goto f_err; | |
0f113f3e MC |
2177 | } |
2178 | ||
20ca916d EK |
2179 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ |
2180 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
73999b62 | 2181 | enc_premaster = *pkt; |
20ca916d | 2182 | } else { |
73999b62 MC |
2183 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) |
2184 | || PACKET_remaining(pkt) != 0) { | |
1c9ed1d8 KR |
2185 | al = SSL_AD_DECODE_ERROR; |
2186 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2187 | SSL_R_LENGTH_MISMATCH); | |
2188 | goto f_err; | |
efcdbcbe | 2189 | } |
0f113f3e MC |
2190 | } |
2191 | ||
2192 | /* | |
20ca916d EK |
2193 | * We want to be sure that the plaintext buffer size makes it safe to |
2194 | * iterate over the entire size of a premaster secret | |
2195 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2196 | * their ciphertext cannot accommodate a premaster secret anyway. | |
0f113f3e | 2197 | */ |
20ca916d EK |
2198 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { |
2199 | al = SSL_AD_INTERNAL_ERROR; | |
f0659bdb | 2200 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
20ca916d | 2201 | RSA_R_KEY_SIZE_TOO_SMALL); |
0f113f3e MC |
2202 | goto f_err; |
2203 | } | |
2204 | ||
20ca916d EK |
2205 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2206 | if (rsa_decrypt == NULL) { | |
efcdbcbe | 2207 | al = SSL_AD_INTERNAL_ERROR; |
f0659bdb | 2208 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2209 | goto f_err; |
2210 | } | |
20ca916d | 2211 | |
0f113f3e MC |
2212 | /* |
2213 | * We must not leak whether a decryption failure occurs because of | |
2214 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2215 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2216 | * generates a random premaster secret for the case that the decrypt | |
2217 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2218 | */ | |
2219 | ||
266483d2 | 2220 | if (RAND_bytes(rand_premaster_secret, |
20ca916d | 2221 | sizeof(rand_premaster_secret)) <= 0) { |
0f113f3e | 2222 | goto err; |
20ca916d EK |
2223 | } |
2224 | ||
2225 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2226 | PACKET_data(&enc_premaster), | |
2227 | rsa_decrypt, rsa, RSA_PKCS1_PADDING); | |
0f113f3e MC |
2228 | ERR_clear_error(); |
2229 | ||
2230 | /* | |
2231 | * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will | |
2232 | * be 0xff if so and zero otherwise. | |
2233 | */ | |
2234 | decrypt_good = | |
2235 | constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); | |
2236 | ||
2237 | /* | |
2238 | * If the version in the decrypted pre-master secret is correct then | |
2239 | * version_good will be 0xff, otherwise it'll be zero. The | |
2240 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2241 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2242 | * check as a "bad version oracle". Thus version checks are done in | |
2243 | * constant time and are treated like any other decryption error. | |
2244 | */ | |
2245 | version_good = | |
20ca916d EK |
2246 | constant_time_eq_8(rsa_decrypt[0], |
2247 | (unsigned)(s->client_version >> 8)); | |
0f113f3e | 2248 | version_good &= |
20ca916d EK |
2249 | constant_time_eq_8(rsa_decrypt[1], |
2250 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e MC |
2251 | |
2252 | /* | |
2253 | * The premaster secret must contain the same version number as the | |
2254 | * ClientHello to detect version rollback attacks (strangely, the | |
2255 | * protocol does not offer such protection for DH ciphersuites). | |
2256 | * However, buggy clients exist that send the negotiated protocol | |
2257 | * version instead if the server does not support the requested | |
2258 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2259 | * clients. | |
2260 | */ | |
2261 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2262 | unsigned char workaround_good; | |
2263 | workaround_good = | |
20ca916d | 2264 | constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8)); |
0f113f3e | 2265 | workaround_good &= |
20ca916d EK |
2266 | constant_time_eq_8(rsa_decrypt[1], |
2267 | (unsigned)(s->version & 0xff)); | |
0f113f3e MC |
2268 | version_good |= workaround_good; |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Both decryption and version must be good for decrypt_good to | |
2273 | * remain non-zero (0xff). | |
2274 | */ | |
2275 | decrypt_good &= version_good; | |
2276 | ||
2277 | /* | |
2278 | * Now copy rand_premaster_secret over from p using | |
2279 | * decrypt_good_mask. If decryption failed, then p does not | |
2280 | * contain valid plaintext, however, a check above guarantees | |
2281 | * it is still sufficiently large to read from. | |
2282 | */ | |
2283 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
20ca916d EK |
2284 | rsa_decrypt[j] = |
2285 | constant_time_select_8(decrypt_good, rsa_decrypt[j], | |
2286 | rand_premaster_secret[j]); | |
0f113f3e MC |
2287 | } |
2288 | ||
20ca916d EK |
2289 | if (!ssl_generate_master_secret(s, rsa_decrypt, |
2290 | sizeof(rand_premaster_secret), 0)) { | |
69f68237 | 2291 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2292 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2293 | goto f_err; |
2294 | } | |
20ca916d EK |
2295 | OPENSSL_free(rsa_decrypt); |
2296 | rsa_decrypt = NULL; | |
0f113f3e | 2297 | } else |
4c5fac4a | 2298 | #endif |
bc36ee62 | 2299 | #ifndef OPENSSL_NO_DH |
bc71f910 | 2300 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
e2b420fd DSH |
2301 | EVP_PKEY *skey = NULL; |
2302 | DH *cdh; | |
f100b031 | 2303 | unsigned int i; |
efcdbcbe | 2304 | |
73999b62 | 2305 | if (!PACKET_get_net_2(pkt, &i)) { |
85269210 | 2306 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
d3cc5e61 | 2307 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2308 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
d3cc5e61 MC |
2309 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2310 | goto f_err; | |
2311 | } | |
0f113f3e | 2312 | i = 0; |
d3cc5e61 | 2313 | } |
73999b62 | 2314 | if (PACKET_remaining(pkt) != i) { |
7538cb82 DSH |
2315 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2316 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); | |
2317 | goto err; | |
0f113f3e | 2318 | } |
e2b420fd DSH |
2319 | skey = s->s3->tmp.pkey; |
2320 | if (skey == NULL) { | |
0f113f3e | 2321 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2322 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2323 | SSL_R_MISSING_TMP_DH_KEY); |
2324 | goto f_err; | |
e2b420fd | 2325 | } |
0f113f3e | 2326 | |
73999b62 | 2327 | if (PACKET_remaining(pkt) == 0L) { |
bc71f910 DSH |
2328 | al = SSL_AD_HANDSHAKE_FAILURE; |
2329 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2330 | SSL_R_MISSING_TMP_DH_KEY); | |
2331 | goto f_err; | |
2332 | } | |
2333 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2334 | /* We already checked we have enough data */ | |
2335 | al = SSL_AD_INTERNAL_ERROR; | |
2336 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2337 | ERR_R_INTERNAL_ERROR); | |
2338 | goto f_err; | |
efcdbcbe | 2339 | } |
e2b420fd DSH |
2340 | ckey = EVP_PKEY_new(); |
2341 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { | |
e27f234a | 2342 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); |
0f113f3e MC |
2343 | goto err; |
2344 | } | |
e2b420fd DSH |
2345 | cdh = EVP_PKEY_get0_DH(ckey); |
2346 | cdh->pub_key = BN_bin2bn(data, i, NULL); | |
2347 | if (cdh->pub_key == NULL) { | |
2348 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); | |
0f113f3e MC |
2349 | goto err; |
2350 | } | |
2351 | ||
e2b420fd | 2352 | if (ssl_derive(s, skey, ckey) == 0) { |
69f68237 | 2353 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2354 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2355 | goto f_err; |
2356 | } | |
e2b420fd DSH |
2357 | |
2358 | EVP_PKEY_free(ckey); | |
2359 | ckey = NULL; | |
5b326dc5 DSH |
2360 | EVP_PKEY_free(s->s3->tmp.pkey); |
2361 | s->s3->tmp.pkey = NULL; | |
e2b420fd | 2362 | |
0f113f3e | 2363 | } else |
d02b48c6 | 2364 | #endif |
ea262260 | 2365 | |
556efe79 | 2366 | #ifndef OPENSSL_NO_EC |
ce0c1f2b DSH |
2367 | if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2368 | EVP_PKEY *skey = s->s3->tmp.pkey; | |
0f113f3e | 2369 | |
73999b62 | 2370 | if (PACKET_remaining(pkt) == 0L) { |
c66ce5eb DSH |
2371 | /* We don't support ECDH client auth */ |
2372 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2373 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2374 | SSL_R_MISSING_TMP_ECDH_KEY); | |
2375 | goto f_err; | |
0f113f3e | 2376 | } else { |
f100b031 BL |
2377 | unsigned int i; |
2378 | ||
0f113f3e MC |
2379 | /* |
2380 | * Get client's public key from encoded point in the | |
2381 | * ClientKeyExchange message. | |
2382 | */ | |
0f113f3e MC |
2383 | |
2384 | /* Get encoded point length */ | |
73999b62 | 2385 | if (!PACKET_get_1(pkt, &i)) { |
efcdbcbe | 2386 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2387 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2388 | SSL_R_LENGTH_MISMATCH); |
2389 | goto f_err; | |
2390 | } | |
73999b62 MC |
2391 | if (!PACKET_get_bytes(pkt, &data, i) |
2392 | || PACKET_remaining(pkt) != 0) { | |
e27f234a | 2393 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2394 | goto err; |
2395 | } | |
880d9d86 DSH |
2396 | ckey = EVP_PKEY_new(); |
2397 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
2398 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
2399 | goto err; | |
2400 | } | |
2401 | if (EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(ckey), data, i, | |
2402 | NULL) == 0) { | |
e27f234a | 2403 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2404 | goto err; |
2405 | } | |
0f113f3e MC |
2406 | } |
2407 | ||
880d9d86 | 2408 | if (ssl_derive(s, skey, ckey) == 0) { |
69f68237 | 2409 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2410 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2411 | goto f_err; |
2412 | } | |
880d9d86 DSH |
2413 | |
2414 | EVP_PKEY_free(ckey); | |
2415 | ckey = NULL; | |
5b326dc5 DSH |
2416 | EVP_PKEY_free(s->s3->tmp.pkey); |
2417 | s->s3->tmp.pkey = NULL; | |
880d9d86 | 2418 | |
e27f234a | 2419 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2420 | } else |
ddac1974 | 2421 | #endif |
edc032b5 | 2422 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 2423 | if (alg_k & SSL_kSRP) { |
f100b031 BL |
2424 | unsigned int i; |
2425 | ||
73999b62 MC |
2426 | if (!PACKET_get_net_2(pkt, &i) |
2427 | || !PACKET_get_bytes(pkt, &data, i)) { | |
0f113f3e | 2428 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2429 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); |
0f113f3e MC |
2430 | goto f_err; |
2431 | } | |
efcdbcbe | 2432 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { |
e27f234a | 2433 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); |
0f113f3e MC |
2434 | goto err; |
2435 | } | |
2436 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2437 | || BN_is_zero(s->srp_ctx.A)) { | |
2438 | al = SSL_AD_ILLEGAL_PARAMETER; | |
e27f234a | 2439 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2440 | SSL_R_BAD_SRP_PARAMETERS); |
2441 | goto f_err; | |
2442 | } | |
b548a1f1 | 2443 | OPENSSL_free(s->session->srp_username); |
7644a9ae | 2444 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); |
0f113f3e | 2445 | if (s->session->srp_username == NULL) { |
e27f234a | 2446 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2447 | goto err; |
2448 | } | |
2449 | ||
57b272b0 | 2450 | if (!srp_generate_server_master_secret(s)) { |
e27f234a | 2451 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
2452 | goto err; |
2453 | } | |
0f113f3e MC |
2454 | } else |
2455 | #endif /* OPENSSL_NO_SRP */ | |
2a9b9654 | 2456 | #ifndef OPENSSL_NO_GOST |
0f113f3e | 2457 | if (alg_k & SSL_kGOST) { |
0f113f3e MC |
2458 | EVP_PKEY_CTX *pkey_ctx; |
2459 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
b6981744 EK |
2460 | unsigned char premaster_secret[32]; |
2461 | const unsigned char *start; | |
0f113f3e MC |
2462 | size_t outlen = 32, inlen; |
2463 | unsigned long alg_a; | |
2464 | int Ttag, Tclass; | |
2465 | long Tlen; | |
73999b62 | 2466 | long sess_key_len; |
0f113f3e MC |
2467 | |
2468 | /* Get our certificate private key */ | |
2469 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
e44380a9 DB |
2470 | if (alg_a & SSL_aGOST12) { |
2471 | /* | |
2472 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2473 | */ | |
2474 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2475 | if (pk == NULL) { | |
2476 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2477 | } | |
2478 | if (pk == NULL) { | |
2479 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2480 | } | |
2481 | } else if (alg_a & SSL_aGOST01) { | |
0f113f3e | 2482 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; |
e44380a9 | 2483 | } |
0f113f3e MC |
2484 | |
2485 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
a71edf3b MC |
2486 | if (pkey_ctx == NULL) { |
2487 | al = SSL_AD_INTERNAL_ERROR; | |
2488 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2489 | goto f_err; | |
2490 | } | |
5f3d93e4 MC |
2491 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { |
2492 | al = SSL_AD_INTERNAL_ERROR; | |
2493 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2494 | goto f_err; | |
2495 | } | |
0f113f3e MC |
2496 | /* |
2497 | * If client certificate is present and is of the same type, maybe | |
2498 | * use it for key exchange. Don't mind errors from | |
2499 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2500 | * client certificate for authorization only. | |
2501 | */ | |
8382fd3a | 2502 | client_pub_pkey = X509_get0_pubkey(s->session->peer); |
0f113f3e MC |
2503 | if (client_pub_pkey) { |
2504 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2505 | ERR_clear_error(); | |
2506 | } | |
2507 | /* Decrypt session key */ | |
73999b62 MC |
2508 | sess_key_len = PACKET_remaining(pkt); |
2509 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
efcdbcbe | 2510 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2511 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2512 | goto gerr; |
efcdbcbe | 2513 | } |
73999b62 MC |
2514 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, |
2515 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2516 | || Ttag != V_ASN1_SEQUENCE | |
0f113f3e | 2517 | || Tclass != V_ASN1_UNIVERSAL) { |
5f3d93e4 | 2518 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2519 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2520 | SSL_R_DECRYPTION_FAILED); |
2521 | goto gerr; | |
2522 | } | |
efcdbcbe | 2523 | start = data; |
0f113f3e MC |
2524 | inlen = Tlen; |
2525 | if (EVP_PKEY_decrypt | |
2526 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
ba4f1331 | 2527 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2528 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2529 | SSL_R_DECRYPTION_FAILED); |
2530 | goto gerr; | |
2531 | } | |
2532 | /* Generate master secret */ | |
57b272b0 DSH |
2533 | if (!ssl_generate_master_secret(s, premaster_secret, |
2534 | sizeof(premaster_secret), 0)) { | |
69f68237 | 2535 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2536 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
5f3d93e4 | 2537 | goto gerr; |
69f68237 | 2538 | } |
0f113f3e MC |
2539 | /* Check if pubkey from client certificate was used */ |
2540 | if (EVP_PKEY_CTX_ctrl | |
2541 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
a71a4966 | 2542 | s->statem.no_cert_verify = 1; |
e27f234a | 2543 | |
e27f234a MC |
2544 | EVP_PKEY_CTX_free(pkey_ctx); |
2545 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
0f113f3e | 2546 | gerr: |
0f113f3e | 2547 | EVP_PKEY_CTX_free(pkey_ctx); |
5f3d93e4 | 2548 | goto f_err; |
2a9b9654 MC |
2549 | } else |
2550 | #endif | |
2551 | { | |
0f113f3e | 2552 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2553 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
0f113f3e MC |
2554 | goto f_err; |
2555 | } | |
2556 | ||
e27f234a | 2557 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2558 | f_err: |
2559 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
556efe79 | 2560 | #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP) |
0f113f3e | 2561 | err: |
ea262260 | 2562 | #endif |
b22d7113 | 2563 | #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) |
880d9d86 | 2564 | EVP_PKEY_free(ckey); |
85269210 | 2565 | #endif |
c849c6d9 | 2566 | OPENSSL_free(rsa_decrypt); |
85269210 DSH |
2567 | #ifndef OPENSSL_NO_PSK |
2568 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2569 | s->s3->tmp.psk = NULL; | |
58964a49 | 2570 | #endif |
fe3a3291 | 2571 | ossl_statem_set_error(s); |
e27f234a | 2572 | return MSG_PROCESS_ERROR; |
0f113f3e | 2573 | } |
d02b48c6 | 2574 | |
be3583fa | 2575 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2576 | { |
94836de2 | 2577 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2578 | if (wst == WORK_MORE_A) { |
2579 | if (SSL_IS_DTLS(s)) { | |
2580 | unsigned char sctpauthkey[64]; | |
2581 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2582 | /* | |
2583 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2584 | * used. | |
2585 | */ | |
141eb8c6 MC |
2586 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2587 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2588 | |
2589 | if (SSL_export_keying_material(s, sctpauthkey, | |
2590 | sizeof(sctpauthkey), labelbuffer, | |
2591 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2592 | ossl_statem_set_error(s); |
c130dd8e MC |
2593 | return WORK_ERROR;; |
2594 | } | |
94836de2 | 2595 | |
c130dd8e MC |
2596 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2597 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2598 | } |
c130dd8e MC |
2599 | wst = WORK_MORE_B; |
2600 | } | |
94836de2 | 2601 | |
c130dd8e MC |
2602 | if ((wst == WORK_MORE_B) |
2603 | /* Is this SCTP? */ | |
2604 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2605 | /* Are we renegotiating? */ | |
2606 | && s->renegotiate | |
2607 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2608 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2609 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2610 | s->s3->in_read_app_data = 2; | |
2611 | s->rwstate = SSL_READING; | |
2612 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2613 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2614 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2615 | return WORK_MORE_B; |
2616 | } else { | |
fe3a3291 | 2617 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2618 | } |
2619 | #endif | |
2620 | ||
a71a4966 | 2621 | if (s->statem.no_cert_verify) { |
94836de2 MC |
2622 | /* No certificate verify so we no longer need the handshake_buffer */ |
2623 | BIO_free(s->s3->handshake_buffer); | |
e44380a9 | 2624 | s->s3->handshake_buffer = NULL; |
94836de2 | 2625 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2626 | } else { |
94836de2 MC |
2627 | if (!s->session->peer) { |
2628 | /* No peer certificate so we no longer need the handshake_buffer */ | |
2629 | BIO_free(s->s3->handshake_buffer); | |
2630 | return WORK_FINISHED_CONTINUE; | |
2631 | } | |
2632 | if (!s->s3->handshake_buffer) { | |
2633 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2634 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2635 | ossl_statem_set_error(s); |
94836de2 MC |
2636 | return WORK_ERROR; |
2637 | } | |
2638 | /* | |
2639 | * For sigalgs freeze the handshake buffer. If we support | |
2640 | * extms we've done this already so this is a no-op | |
2641 | */ | |
2642 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2643 | ossl_statem_set_error(s); |
94836de2 MC |
2644 | return WORK_ERROR; |
2645 | } | |
94836de2 MC |
2646 | } |
2647 | ||
2648 | return WORK_FINISHED_CONTINUE; | |
2649 | } | |
2650 | ||
be3583fa | 2651 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2652 | { |
2653 | EVP_PKEY *pkey = NULL; | |
b6981744 | 2654 | const unsigned char *sig, *data; |
5ca17d8c | 2655 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2656 | unsigned char *gost_data = NULL; |
5ca17d8c | 2657 | #endif |
e27f234a | 2658 | int al, ret = MSG_PROCESS_ERROR; |
28f4580c | 2659 | int type = 0, j; |
e27f234a MC |
2660 | unsigned int len; |
2661 | X509 *peer; | |
2662 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2663 | long hdatalen = 0; |
2664 | void *hdata; | |
2665 | ||
bfb0641f | 2666 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
6e59a892 RL |
2667 | |
2668 | if (mctx == NULL) { | |
2669 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2670 | al = SSL_AD_INTERNAL_ERROR; | |
2671 | goto f_err; | |
2672 | } | |
e27f234a | 2673 | |
a0bd6493 | 2674 | peer = s->session->peer; |
8382fd3a | 2675 | pkey = X509_get0_pubkey(peer); |
a0bd6493 | 2676 | type = X509_certificate_type(peer, pkey); |
0f113f3e MC |
2677 | |
2678 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2679 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2680 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2681 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2682 | goto f_err; | |
2683 | } | |
2684 | ||
0f113f3e MC |
2685 | /* Check for broken implementations of GOST ciphersuites */ |
2686 | /* | |
2687 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2688 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2689 | */ |
2a9b9654 | 2690 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2691 | if (PACKET_remaining(pkt) == 64 |
2692 | && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { | |
f532a35d | 2693 | len = 64; |
2a9b9654 MC |
2694 | } else |
2695 | #endif | |
2696 | { | |
0f113f3e | 2697 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2698 | int rv; |
2699 | ||
73999b62 | 2700 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2701 | al = SSL_AD_DECODE_ERROR; |
2702 | goto f_err; | |
2703 | } | |
2704 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2705 | if (rv == -1) { |
2706 | al = SSL_AD_INTERNAL_ERROR; | |
2707 | goto f_err; | |
2708 | } else if (rv == 0) { | |
2709 | al = SSL_AD_DECODE_ERROR; | |
2710 | goto f_err; | |
2711 | } | |
f37f20ff | 2712 | #ifdef SSL_DEBUG |
0f113f3e | 2713 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2714 | #endif |
28f4580c | 2715 | } else { |
aa430c74 DSH |
2716 | /* Use default digest for this key type */ |
2717 | int idx = ssl_cert_type(NULL, pkey); | |
2718 | if (idx >= 0) | |
2719 | md = s->s3->tmp.md[idx]; | |
2720 | if (md == NULL) { | |
2721 | al = SSL_AD_INTERNAL_ERROR; | |
2722 | goto f_err; | |
2723 | } | |
0f113f3e | 2724 | } |
aa430c74 | 2725 | |
73999b62 | 2726 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2727 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2728 | al = SSL_AD_DECODE_ERROR; |
2729 | goto f_err; | |
2730 | } | |
2731 | } | |
2732 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
2733 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
2734 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 2735 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2736 | al = SSL_AD_DECODE_ERROR; |
2737 | goto f_err; | |
2738 | } | |
73999b62 | 2739 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2740 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2741 | al = SSL_AD_DECODE_ERROR; |
2742 | goto f_err; | |
2743 | } | |
0f113f3e | 2744 | |
28f4580c DSH |
2745 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2746 | if (hdatalen <= 0) { | |
2747 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2748 | al = SSL_AD_INTERNAL_ERROR; | |
2749 | goto f_err; | |
2750 | } | |
f37f20ff | 2751 | #ifdef SSL_DEBUG |
28f4580c | 2752 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2753 | #endif |
6e59a892 RL |
2754 | if (!EVP_VerifyInit_ex(mctx, md, NULL) |
2755 | || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) { | |
28f4580c DSH |
2756 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
2757 | al = SSL_AD_INTERNAL_ERROR; | |
2758 | goto f_err; | |
2759 | } | |
0f113f3e | 2760 | |
2a9b9654 | 2761 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2762 | { |
2763 | int pktype = EVP_PKEY_id(pkey); | |
2764 | if (pktype == NID_id_GostR3410_2001 | |
2765 | || pktype == NID_id_GostR3410_2012_256 | |
b6981744 EK |
2766 | || pktype == NID_id_GostR3410_2012_512) { |
2767 | if ((gost_data = OPENSSL_malloc(len)) == NULL) { | |
2768 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2769 | al = SSL_AD_INTERNAL_ERROR; | |
2770 | goto f_err; | |
2771 | } | |
2772 | BUF_reverse(gost_data, data, len); | |
2773 | data = gost_data; | |
2774 | } | |
28f4580c | 2775 | } |
2a9b9654 | 2776 | #endif |
e44380a9 | 2777 | |
28f4580c | 2778 | if (s->version == SSL3_VERSION |
6e59a892 | 2779 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
28f4580c DSH |
2780 | s->session->master_key_length, |
2781 | s->session->master_key)) { | |
2782 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2783 | al = SSL_AD_INTERNAL_ERROR; | |
2784 | goto f_err; | |
2785 | } | |
2786 | ||
6e59a892 | 2787 | if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) { |
28f4580c DSH |
2788 | al = SSL_AD_DECRYPT_ERROR; |
2789 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2790 | goto f_err; |
2791 | } | |
2792 | ||
c130dd8e | 2793 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2794 | if (0) { |
2795 | f_err: | |
2796 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 2797 | ossl_statem_set_error(s); |
0f113f3e | 2798 | } |
25aaa98a RS |
2799 | BIO_free(s->s3->handshake_buffer); |
2800 | s->s3->handshake_buffer = NULL; | |
bfb0641f | 2801 | EVP_MD_CTX_free(mctx); |
5ca17d8c | 2802 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2803 | OPENSSL_free(gost_data); |
5ca17d8c | 2804 | #endif |
e27f234a | 2805 | return ret; |
0f113f3e | 2806 | } |
d02b48c6 | 2807 | |
be3583fa | 2808 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 2809 | { |
20dbe585 | 2810 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
2811 | X509 *x = NULL; |
2812 | unsigned long l, llen; | |
b6981744 | 2813 | const unsigned char *certstart, *certbytes; |
e27f234a | 2814 | STACK_OF(X509) *sk = NULL; |
73999b62 | 2815 | PACKET spkt; |
0f113f3e MC |
2816 | |
2817 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
2818 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2819 | goto f_err; | |
0f113f3e MC |
2820 | } |
2821 | ||
73999b62 MC |
2822 | if (!PACKET_get_net_3(pkt, &llen) |
2823 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
2824 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 2825 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2826 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2827 | goto f_err; |
2828 | } | |
0bc09ecd MC |
2829 | |
2830 | while (PACKET_remaining(&spkt) > 0) { | |
2831 | if (!PACKET_get_net_3(&spkt, &l) | |
2832 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 2833 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2834 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2835 | SSL_R_CERT_LENGTH_MISMATCH); |
2836 | goto f_err; | |
2837 | } | |
2838 | ||
0bc09ecd MC |
2839 | certstart = certbytes; |
2840 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 2841 | if (x == NULL) { |
e27f234a MC |
2842 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
2843 | goto f_err; | |
0f113f3e | 2844 | } |
0bc09ecd | 2845 | if (certbytes != (certstart + l)) { |
0f113f3e | 2846 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2847 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2848 | SSL_R_CERT_LENGTH_MISMATCH); |
2849 | goto f_err; | |
2850 | } | |
2851 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
2852 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2853 | goto f_err; | |
0f113f3e MC |
2854 | } |
2855 | x = NULL; | |
0f113f3e MC |
2856 | } |
2857 | ||
2858 | if (sk_X509_num(sk) <= 0) { | |
2859 | /* TLS does not mind 0 certs returned */ | |
2860 | if (s->version == SSL3_VERSION) { | |
2861 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2862 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2863 | SSL_R_NO_CERTIFICATES_RETURNED); |
2864 | goto f_err; | |
2865 | } | |
2866 | /* Fail for TLS only if we required a certificate */ | |
2867 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
2868 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 2869 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2870 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
2871 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2872 | goto f_err; | |
2873 | } | |
2874 | /* No client certificate so digest cached records */ | |
124037fd | 2875 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
2876 | goto f_err; |
2877 | } | |
2878 | } else { | |
2879 | EVP_PKEY *pkey; | |
2880 | i = ssl_verify_cert_chain(s, sk); | |
2881 | if (i <= 0) { | |
2882 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 2883 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2884 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
2885 | goto f_err; | |
2886 | } | |
2887 | if (i > 1) { | |
e27f234a | 2888 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
2889 | al = SSL_AD_HANDSHAKE_FAILURE; |
2890 | goto f_err; | |
2891 | } | |
8382fd3a | 2892 | pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); |
0f113f3e MC |
2893 | if (pkey == NULL) { |
2894 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2895 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2896 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
2897 | goto f_err; | |
2898 | } | |
0f113f3e MC |
2899 | } |
2900 | ||
222561fe | 2901 | X509_free(s->session->peer); |
0f113f3e MC |
2902 | s->session->peer = sk_X509_shift(sk); |
2903 | s->session->verify_result = s->verify_result; | |
2904 | ||
c34b0f99 DSH |
2905 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
2906 | s->session->peer_chain = sk; | |
0f113f3e MC |
2907 | /* |
2908 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
2909 | * certificate, while we do include it in s3_clnt.c | |
2910 | */ | |
0f113f3e | 2911 | sk = NULL; |
e27f234a | 2912 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
2913 | goto done; |
2914 | ||
0f113f3e | 2915 | f_err: |
66696478 | 2916 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 2917 | ossl_statem_set_error(s); |
66696478 | 2918 | done: |
222561fe RS |
2919 | X509_free(x); |
2920 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 2921 | return ret; |
0f113f3e | 2922 | } |
d02b48c6 | 2923 | |
e27f234a MC |
2924 | int tls_construct_server_certificate(SSL *s) |
2925 | { | |
2926 | CERT_PKEY *cpk; | |
2927 | ||
2928 | cpk = ssl_get_server_send_pkey(s); | |
2929 | if (cpk == NULL) { | |
2930 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2931 | ossl_statem_set_error(s); |
e27f234a MC |
2932 | return 0; |
2933 | } | |
2934 | ||
2935 | if (!ssl3_output_cert_chain(s, cpk)) { | |
2936 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2937 | ossl_statem_set_error(s); |
e27f234a MC |
2938 | return 0; |
2939 | } | |
2940 | ||
2941 | return 1; | |
2942 | } | |
2943 | ||
e27f234a MC |
2944 | int tls_construct_new_session_ticket(SSL *s) |
2945 | { | |
2946 | unsigned char *senc = NULL; | |
846ec07d | 2947 | EVP_CIPHER_CTX *ctx; |
bf7c6817 | 2948 | HMAC_CTX *hctx = NULL; |
e27f234a MC |
2949 | unsigned char *p, *macstart; |
2950 | const unsigned char *const_p; | |
2951 | int len, slen_full, slen; | |
2952 | SSL_SESSION *sess; | |
2953 | unsigned int hlen; | |
2954 | SSL_CTX *tctx = s->initial_ctx; | |
2955 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
2956 | unsigned char key_name[16]; | |
2957 | ||
2958 | /* get session encoding length */ | |
2959 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
2960 | /* | |
2961 | * Some length values are 16 bits, so forget it if session is too | |
2962 | * long | |
2963 | */ | |
2964 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 2965 | ossl_statem_set_error(s); |
e27f234a MC |
2966 | return 0; |
2967 | } | |
2968 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 2969 | if (senc == NULL) { |
fe3a3291 | 2970 | ossl_statem_set_error(s); |
e27f234a MC |
2971 | return 0; |
2972 | } | |
0f113f3e | 2973 | |
846ec07d | 2974 | ctx = EVP_CIPHER_CTX_new(); |
bf7c6817 | 2975 | hctx = HMAC_CTX_new(); |
0f113f3e | 2976 | |
e27f234a MC |
2977 | p = senc; |
2978 | if (!i2d_SSL_SESSION(s->session, &p)) | |
2979 | goto err; | |
687eaf27 | 2980 | |
e27f234a MC |
2981 | /* |
2982 | * create a fresh copy (not shared with other threads) to clean up | |
2983 | */ | |
2984 | const_p = senc; | |
2985 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
2986 | if (sess == NULL) | |
2987 | goto err; | |
2988 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 2989 | |
e27f234a MC |
2990 | slen = i2d_SSL_SESSION(sess, NULL); |
2991 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
2992 | SSL_SESSION_free(sess); | |
2993 | goto err; | |
2994 | } | |
2995 | p = senc; | |
2996 | if (!i2d_SSL_SESSION(sess, &p)) { | |
2997 | SSL_SESSION_free(sess); | |
2998 | goto err; | |
2999 | } | |
3000 | SSL_SESSION_free(sess); | |
0f113f3e | 3001 | |
e27f234a MC |
3002 | /*- |
3003 | * Grow buffer if need be: the length calculation is as | |
3004 | * follows handshake_header_length + | |
3005 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
3006 | * 16 (key name) + max_iv_len (iv length) + | |
3007 | * session_length + max_enc_block_size (max encrypted session | |
3008 | * length) + max_md_size (HMAC). | |
3009 | */ | |
3010 | if (!BUF_MEM_grow(s->init_buf, | |
3011 | SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + | |
3012 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
3013 | goto err; | |
0f113f3e | 3014 | |
e27f234a MC |
3015 | p = ssl_handshake_start(s); |
3016 | /* | |
3017 | * Initialize HMAC and cipher contexts. If callback present it does | |
3018 | * all the work otherwise use generated values from parent ctx. | |
3019 | */ | |
3020 | if (tctx->tlsext_ticket_key_cb) { | |
846ec07d | 3021 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx, hctx, 1) < 0) |
e27f234a MC |
3022 | goto err; |
3023 | } else { | |
3024 | if (RAND_bytes(iv, 16) <= 0) | |
687eaf27 | 3025 | goto err; |
846ec07d | 3026 | if (!EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, |
e27f234a | 3027 | tctx->tlsext_tick_aes_key, iv)) |
687eaf27 | 3028 | goto err; |
bf7c6817 | 3029 | if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, 16, |
e27f234a | 3030 | EVP_sha256(), NULL)) |
4f9fab6b | 3031 | goto err; |
e27f234a | 3032 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
0f113f3e MC |
3033 | } |
3034 | ||
e27f234a MC |
3035 | /* |
3036 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3037 | * for resumed session (for simplicity), and guess that tickets for | |
3038 | * new sessions will live as long as their sessions. | |
3039 | */ | |
3040 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3041 | ||
3042 | /* Skip ticket length for now */ | |
3043 | p += 2; | |
3044 | /* Output key name */ | |
3045 | macstart = p; | |
3046 | memcpy(p, key_name, 16); | |
3047 | p += 16; | |
3048 | /* output IV */ | |
846ec07d RL |
3049 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
3050 | p += EVP_CIPHER_CTX_iv_length(ctx); | |
e27f234a | 3051 | /* Encrypt session data */ |
846ec07d | 3052 | if (!EVP_EncryptUpdate(ctx, p, &len, senc, slen)) |
e27f234a MC |
3053 | goto err; |
3054 | p += len; | |
846ec07d | 3055 | if (!EVP_EncryptFinal(ctx, p, &len)) |
e27f234a MC |
3056 | goto err; |
3057 | p += len; | |
3058 | ||
bf7c6817 | 3059 | if (!HMAC_Update(hctx, macstart, p - macstart)) |
e27f234a | 3060 | goto err; |
bf7c6817 | 3061 | if (!HMAC_Final(hctx, p, &hlen)) |
e27f234a MC |
3062 | goto err; |
3063 | ||
846ec07d | 3064 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3065 | HMAC_CTX_free(hctx); |
846ec07d RL |
3066 | ctx = NULL; |
3067 | hctx = NULL; | |
e27f234a MC |
3068 | |
3069 | p += hlen; | |
3070 | /* Now write out lengths: p points to end of data written */ | |
3071 | /* Total length */ | |
3072 | len = p - ssl_handshake_start(s); | |
3073 | /* Skip ticket lifetime hint */ | |
3074 | p = ssl_handshake_start(s) + 4; | |
3075 | s2n(len - 6, p); | |
3076 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3077 | goto err; | |
3078 | OPENSSL_free(senc); | |
3079 | ||
3080 | return 1; | |
687eaf27 | 3081 | err: |
b548a1f1 | 3082 | OPENSSL_free(senc); |
846ec07d | 3083 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3084 | HMAC_CTX_free(hctx); |
fe3a3291 | 3085 | ossl_statem_set_error(s); |
e27f234a | 3086 | return 0; |
0f113f3e | 3087 | } |
67c8e7f4 | 3088 | |
e27f234a MC |
3089 | int tls_construct_cert_status(SSL *s) |
3090 | { | |
3091 | unsigned char *p; | |
3092 | /*- | |
3093 | * Grow buffer if need be: the length calculation is as | |
3094 | * follows 1 (message type) + 3 (message length) + | |
3095 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3096 | * + (ocsp response) | |
3097 | */ | |
3098 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3099 | ossl_statem_set_error(s); |
e27f234a MC |
3100 | return 0; |
3101 | } | |
3102 | ||
3103 | p = (unsigned char *)s->init_buf->data; | |
3104 | ||
3105 | /* do the header */ | |
3106 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3107 | /* message length */ | |
3108 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3109 | /* status type */ | |
3110 | *(p++) = s->tlsext_status_type; | |
3111 | /* length of OCSP response */ | |
3112 | l2n3(s->tlsext_ocsp_resplen, p); | |
3113 | /* actual response */ | |
3114 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3115 | /* number of bytes to write */ | |
3116 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3117 | s->init_off = 0; | |
3118 | ||
3119 | return 1; | |
3120 | } | |
3121 | ||
e481f9b9 | 3122 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3123 | /* |
3124 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3125 | * It sets the next_proto member in s if found | |
3126 | */ | |
be3583fa | 3127 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3128 | { |
73999b62 | 3129 | PACKET next_proto, padding; |
e27f234a MC |
3130 | size_t next_proto_len; |
3131 | ||
50e735f9 MC |
3132 | /*- |
3133 | * The payload looks like: | |
3134 | * uint8 proto_len; | |
3135 | * uint8 proto[proto_len]; | |
3136 | * uint8 padding_len; | |
3137 | * uint8 padding[padding_len]; | |
3138 | */ | |
73999b62 MC |
3139 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3140 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3141 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3142 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3143 | goto err; |
cf9b0b6f | 3144 | } |
0f113f3e | 3145 | |
6d41fc80 EK |
3146 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3147 | &next_proto_len)) { | |
3148 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3149 | goto err; |
3150 | } | |
3151 | ||
6d41fc80 | 3152 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3153 | |
e27f234a | 3154 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3155 | err: |
fe3a3291 | 3156 | ossl_statem_set_error(s); |
e27f234a | 3157 | return MSG_PROCESS_ERROR; |
0f113f3e | 3158 | } |
6434abbf | 3159 | #endif |
d45ba43d MC |
3160 | |
3161 | #define SSLV2_CIPHER_LEN 3 | |
3162 | ||
38a3cbfb EK |
3163 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3164 | PACKET *cipher_suites, | |
d45ba43d | 3165 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3166 | int sslv2format, int *al |
3167 | ) | |
d45ba43d MC |
3168 | { |
3169 | const SSL_CIPHER *c; | |
3170 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3171 | int n; |
3172 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3173 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3174 | |
38a3cbfb EK |
3175 | s->s3->send_connection_binding = 0; |
3176 | ||
3177 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3178 | ||
3179 | if (PACKET_remaining(cipher_suites) == 0) { | |
3180 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3181 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3182 | return NULL; | |
d45ba43d | 3183 | } |
38a3cbfb EK |
3184 | |
3185 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3186 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3187 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3188 | *al = SSL_AD_DECODE_ERROR; |
3189 | return NULL; | |
d45ba43d | 3190 | } |
38a3cbfb | 3191 | |
d45ba43d MC |
3192 | if ((skp == NULL) || (*skp == NULL)) { |
3193 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3194 | if(sk == NULL) { | |
3195 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3196 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3197 | return NULL; |
3198 | } | |
3199 | } else { | |
3200 | sk = *skp; | |
3201 | sk_SSL_CIPHER_zero(sk); | |
3202 | } | |
3203 | ||
38a3cbfb EK |
3204 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3205 | &s->s3->tmp.ciphers_rawlen)) { | |
3206 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3207 | goto err; |
3208 | } | |
d45ba43d | 3209 | |
38a3cbfb EK |
3210 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3211 | /* | |
20218b58 EK |
3212 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3213 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3214 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3215 | */ |
3216 | if (sslv2format && cipher[0] != '\0') | |
3217 | continue; | |
3218 | ||
d45ba43d | 3219 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3220 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3221 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3222 | /* SCSV fatal if renegotiating */ |
3223 | if (s->renegotiate) { | |
3224 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3225 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3226 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3227 | goto err; |
3228 | } | |
3229 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3230 | continue; |
3231 | } | |
3232 | ||
3233 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3234 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3235 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3236 | /* |
3237 | * The SCSV indicates that the client previously tried a higher | |
3238 | * version. Fail if the current version is an unexpected | |
3239 | * downgrade. | |
3240 | */ | |
4fa52141 | 3241 | if (!ssl_check_version_downgrade(s)) { |
d45ba43d MC |
3242 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3243 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3244 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3245 | goto err; |
3246 | } | |
d45ba43d MC |
3247 | continue; |
3248 | } | |
3249 | ||
38a3cbfb EK |
3250 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3251 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3252 | if (c != NULL) { |
3253 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3254 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3255 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3256 | goto err; |
3257 | } | |
3258 | } | |
3259 | } | |
38a3cbfb EK |
3260 | if (PACKET_remaining(cipher_suites) > 0) { |
3261 | *al = SSL_AD_INTERNAL_ERROR; | |
3262 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3263 | goto err; | |
3264 | } | |
d45ba43d MC |
3265 | |
3266 | if (skp != NULL) | |
3267 | *skp = sk; | |
3268 | return (sk); | |
3269 | err: | |
3270 | if ((skp == NULL) || (*skp == NULL)) | |
3271 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3272 | return NULL; |
d45ba43d | 3273 | } |