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8ba708e5 | 1 | /* ssl/statem/statem_srvr.c -*- mode:C; c-file-style: "eay" -*- */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 8 | * |
d02b48c6 RE |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 15 | * |
d02b48c6 RE |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 22 | * |
d02b48c6 RE |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
0f113f3e | 52 | * |
d02b48c6 RE |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
8e2f6b79 | 58 | /* ==================================================================== |
52b8dad8 | 59 | * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
8e2f6b79 BM |
60 | * |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 66 | * notice, this list of conditions and the following disclaimer. |
8e2f6b79 BM |
67 | * |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
ea262260 BM |
111 | /* ==================================================================== |
112 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
113 | * | |
0f113f3e | 114 | * Portions of the attached software ("Contribution") are developed by |
ea262260 BM |
115 | * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
116 | * | |
117 | * The Contribution is licensed pursuant to the OpenSSL open source | |
118 | * license provided above. | |
119 | * | |
ea262260 BM |
120 | * ECC cipher suite support in OpenSSL originally written by |
121 | * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. | |
122 | * | |
123 | */ | |
ddac1974 NL |
124 | /* ==================================================================== |
125 | * Copyright 2005 Nokia. All rights reserved. | |
126 | * | |
127 | * The portions of the attached software ("Contribution") is developed by | |
128 | * Nokia Corporation and is licensed pursuant to the OpenSSL open source | |
129 | * license. | |
130 | * | |
131 | * The Contribution, originally written by Mika Kousa and Pasi Eronen of | |
132 | * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites | |
133 | * support (see RFC 4279) to OpenSSL. | |
134 | * | |
135 | * No patent licenses or other rights except those expressly stated in | |
136 | * the OpenSSL open source license shall be deemed granted or received | |
137 | * expressly, by implication, estoppel, or otherwise. | |
138 | * | |
139 | * No assurances are provided by Nokia that the Contribution does not | |
140 | * infringe the patent or other intellectual property rights of any third | |
141 | * party or that the license provides you with all the necessary rights | |
142 | * to make use of the Contribution. | |
143 | * | |
144 | * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN | |
145 | * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA | |
146 | * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY | |
147 | * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR | |
148 | * OTHERWISE. | |
149 | */ | |
d02b48c6 | 150 | |
de469ef2 | 151 | |
d02b48c6 | 152 | #include <stdio.h> |
8ba708e5 | 153 | #include "../ssl_locl.h" |
61ae935a | 154 | #include "statem_locl.h" |
68570797 | 155 | #include "internal/constant_time_locl.h" |
ec577822 BM |
156 | #include <openssl/buffer.h> |
157 | #include <openssl/rand.h> | |
158 | #include <openssl/objects.h> | |
159 | #include <openssl/evp.h> | |
6434abbf | 160 | #include <openssl/hmac.h> |
ec577822 | 161 | #include <openssl/x509.h> |
3eeaab4b | 162 | #ifndef OPENSSL_NO_DH |
0f113f3e | 163 | # include <openssl/dh.h> |
3eeaab4b | 164 | #endif |
d095b68d | 165 | #include <openssl/bn.h> |
dbad1690 | 166 | #include <openssl/md5.h> |
f9b3bff6 | 167 | |
38a3cbfb EK |
168 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
169 | PACKET *cipher_suites, | |
170 | STACK_OF(SSL_CIPHER) **skp, | |
171 | int sslv2format, int *al); | |
d45ba43d | 172 | |
61ae935a MC |
173 | /* |
174 | * server_read_transition() encapsulates the logic for the allowed handshake | |
175 | * state transitions when the server is reading messages from the client. The | |
176 | * message type that the client has sent is provided in |mt|. The current state | |
177 | * is in |s->statem.hand_state|. | |
178 | * | |
179 | * Valid return values are: | |
180 | * 1: Success (transition allowed) | |
181 | * 0: Error (transition not allowed) | |
182 | */ | |
183 | int server_read_transition(SSL *s, int mt) | |
184 | { | |
d6f1a6e9 | 185 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
186 | |
187 | switch(st->hand_state) { | |
188 | case TLS_ST_BEFORE: | |
189 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
190 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
191 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
192 | return 1; | |
193 | } | |
194 | break; | |
195 | ||
196 | case TLS_ST_SW_SRVR_DONE: | |
197 | /* | |
198 | * If we get a CKE message after a ServerDone then either | |
199 | * 1) We didn't request a Certificate | |
200 | * OR | |
201 | * 2) If we did request one then | |
202 | * a) We allow no Certificate to be returned | |
203 | * AND | |
204 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
205 | * list if we requested a certificate) | |
206 | */ | |
207 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE | |
208 | && (!s->s3->tmp.cert_request | |
209 | || (!((s->verify_mode & SSL_VERIFY_PEER) && | |
210 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
211 | && (s->version == SSL3_VERSION)))) { | |
212 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
213 | return 1; | |
214 | } else if (s->s3->tmp.cert_request) { | |
215 | if (mt == SSL3_MT_CERTIFICATE) { | |
216 | st->hand_state = TLS_ST_SR_CERT; | |
217 | return 1; | |
218 | } | |
219 | } | |
220 | break; | |
221 | ||
222 | case TLS_ST_SR_CERT: | |
223 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
224 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
225 | return 1; | |
226 | } | |
227 | break; | |
228 | ||
229 | case TLS_ST_SR_KEY_EXCH: | |
230 | /* | |
231 | * We should only process a CertificateVerify message if we have | |
232 | * received a Certificate from the client. If so then |s->session->peer| | |
233 | * will be non NULL. In some instances a CertificateVerify message is | |
234 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 235 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
236 | * set. |
237 | */ | |
a71a4966 | 238 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
239 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
240 | /* | |
241 | * For the ECDH ciphersuites when the client sends its ECDH | |
242 | * pub key in a certificate, the CertificateVerify message is | |
243 | * not sent. Also for GOST ciphersuites when the client uses | |
244 | * its key from the certificate for key exchange. | |
245 | */ | |
246 | st->hand_state = TLS_ST_SR_CHANGE; | |
247 | return 1; | |
248 | } | |
249 | } else { | |
250 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
251 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
252 | return 1; | |
253 | } | |
254 | } | |
255 | break; | |
256 | ||
257 | case TLS_ST_SR_CERT_VRFY: | |
258 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
259 | st->hand_state = TLS_ST_SR_CHANGE; | |
260 | return 1; | |
261 | } | |
262 | break; | |
263 | ||
264 | case TLS_ST_SR_CHANGE: | |
265 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
266 | if (s->s3->next_proto_neg_seen) { | |
267 | if (mt == SSL3_MT_NEXT_PROTO) { | |
268 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
269 | return 1; | |
270 | } | |
271 | } else { | |
272 | #endif | |
273 | if (mt == SSL3_MT_FINISHED) { | |
274 | st->hand_state = TLS_ST_SR_FINISHED; | |
275 | return 1; | |
276 | } | |
277 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
278 | } | |
279 | #endif | |
280 | break; | |
281 | ||
282 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
283 | case TLS_ST_SR_NEXT_PROTO: | |
284 | if (mt == SSL3_MT_FINISHED) { | |
285 | st->hand_state = TLS_ST_SR_FINISHED; | |
286 | return 1; | |
287 | } | |
288 | break; | |
289 | #endif | |
290 | ||
291 | case TLS_ST_SW_FINISHED: | |
292 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
293 | st->hand_state = TLS_ST_SR_CHANGE; | |
294 | return 1; | |
295 | } | |
296 | break; | |
297 | ||
298 | default: | |
299 | break; | |
300 | } | |
301 | ||
302 | /* No valid transition found */ | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Should we send a ServerKeyExchange message? | |
308 | * | |
309 | * Valid return values are: | |
310 | * 1: Yes | |
311 | * 0: No | |
312 | */ | |
313 | static inline int send_server_key_exchange(SSL *s) | |
314 | { | |
315 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
316 | ||
317 | /* | |
318 | * only send a ServerKeyExchange if DH, fortezza or RSA but we have a | |
319 | * sign only certificate PSK: may send PSK identity hints For | |
320 | * ECC ciphersuites, we send a serverKeyExchange message only if | |
321 | * the cipher suite is either ECDH-anon or ECDHE. In other cases, | |
322 | * the server certificate contains the server's public key for | |
323 | * key exchange. | |
324 | */ | |
325 | if ( (alg_k & SSL_kDHE) | |
326 | || (alg_k & SSL_kECDHE) | |
327 | || ((alg_k & SSL_kRSA) | |
328 | && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL | |
329 | || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) | |
330 | && EVP_PKEY_size(s->cert->pkeys | |
331 | [SSL_PKEY_RSA_ENC].privatekey) * | |
332 | 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) | |
333 | ) | |
334 | ) | |
335 | ) | |
336 | /* | |
337 | * PSK: send ServerKeyExchange if PSK identity hint if | |
338 | * provided | |
339 | */ | |
340 | #ifndef OPENSSL_NO_PSK | |
341 | /* Only send SKE if we have identity hint for plain PSK */ | |
342 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
343 | && s->cert->psk_identity_hint) | |
344 | /* For other PSK always send SKE */ | |
345 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
346 | #endif | |
347 | #ifndef OPENSSL_NO_SRP | |
348 | /* SRP: send ServerKeyExchange */ | |
349 | || (alg_k & SSL_kSRP) | |
350 | #endif | |
351 | ) { | |
352 | return 1; | |
353 | } | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Should we send a CertificateRequest message? | |
360 | * | |
361 | * Valid return values are: | |
362 | * 1: Yes | |
363 | * 0: No | |
364 | */ | |
365 | static inline int send_certificate_request(SSL *s) | |
366 | { | |
367 | if ( | |
368 | /* don't request cert unless asked for it: */ | |
369 | s->verify_mode & SSL_VERIFY_PEER | |
370 | /* | |
371 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
372 | * during re-negotiation: | |
373 | */ | |
374 | && ((s->session->peer == NULL) || | |
375 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) | |
376 | /* | |
377 | * never request cert in anonymous ciphersuites (see | |
378 | * section "Certificate request" in SSL 3 drafts and in | |
379 | * RFC 2246): | |
380 | */ | |
381 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
382 | /* | |
383 | * ... except when the application insists on | |
384 | * verification (against the specs, but s3_clnt.c accepts | |
385 | * this for SSL 3) | |
386 | */ | |
387 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
388 | /* don't request certificate for SRP auth */ | |
389 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
390 | /* | |
391 | * With normal PSK Certificates and Certificate Requests | |
392 | * are omitted | |
393 | */ | |
394 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
395 | return 1; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | /* | |
402 | * server_write_transition() works out what handshake state to move to next | |
403 | * when the server is writing messages to be sent to the client. | |
404 | */ | |
405 | enum WRITE_TRAN server_write_transition(SSL *s) | |
406 | { | |
d6f1a6e9 | 407 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
408 | |
409 | switch(st->hand_state) { | |
410 | case TLS_ST_BEFORE: | |
411 | /* Just go straight to trying to read from the client */; | |
412 | return WRITE_TRAN_FINISHED; | |
413 | ||
414 | case TLS_ST_OK: | |
415 | /* We must be trying to renegotiate */ | |
416 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
417 | return WRITE_TRAN_CONTINUE; | |
418 | ||
419 | case TLS_ST_SW_HELLO_REQ: | |
420 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 421 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
422 | return WRITE_TRAN_CONTINUE; |
423 | ||
424 | case TLS_ST_SR_CLNT_HELLO: | |
425 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
426 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) | |
427 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; | |
428 | else | |
429 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
430 | return WRITE_TRAN_CONTINUE; | |
431 | ||
432 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
433 | return WRITE_TRAN_FINISHED; | |
434 | ||
435 | case TLS_ST_SW_SRVR_HELLO: | |
436 | if (s->hit) { | |
437 | if (s->tlsext_ticket_expected) | |
438 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
439 | else | |
440 | st->hand_state = TLS_ST_SW_CHANGE; | |
441 | } else { | |
442 | /* Check if it is anon DH or anon ECDH, */ | |
443 | /* normal PSK or SRP */ | |
444 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
445 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { | |
446 | st->hand_state = TLS_ST_SW_CERT; | |
447 | } else if (send_server_key_exchange(s)) { | |
448 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
449 | } else if (send_certificate_request(s)) { | |
450 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
451 | } else { | |
452 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
453 | } | |
454 | } | |
455 | return WRITE_TRAN_CONTINUE; | |
456 | ||
457 | case TLS_ST_SW_CERT: | |
458 | if (s->tlsext_status_expected) { | |
459 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
460 | return WRITE_TRAN_CONTINUE; | |
461 | } | |
462 | /* Fall through */ | |
463 | ||
464 | case TLS_ST_SW_CERT_STATUS: | |
465 | if (send_server_key_exchange(s)) { | |
466 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
467 | return WRITE_TRAN_CONTINUE; | |
468 | } | |
469 | /* Fall through */ | |
470 | ||
471 | case TLS_ST_SW_KEY_EXCH: | |
472 | if (send_certificate_request(s)) { | |
473 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
474 | return WRITE_TRAN_CONTINUE; | |
475 | } | |
476 | /* Fall through */ | |
477 | ||
478 | case TLS_ST_SW_CERT_REQ: | |
479 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
480 | return WRITE_TRAN_CONTINUE; | |
481 | ||
482 | case TLS_ST_SW_SRVR_DONE: | |
483 | return WRITE_TRAN_FINISHED; | |
484 | ||
485 | case TLS_ST_SR_FINISHED: | |
486 | if (s->hit) { | |
487 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 488 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
489 | return WRITE_TRAN_CONTINUE; |
490 | } else if (s->tlsext_ticket_expected) { | |
491 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
492 | } else { | |
493 | st->hand_state = TLS_ST_SW_CHANGE; | |
494 | } | |
495 | return WRITE_TRAN_CONTINUE; | |
496 | ||
497 | case TLS_ST_SW_SESSION_TICKET: | |
498 | st->hand_state = TLS_ST_SW_CHANGE; | |
499 | return WRITE_TRAN_CONTINUE; | |
500 | ||
501 | case TLS_ST_SW_CHANGE: | |
502 | st->hand_state = TLS_ST_SW_FINISHED; | |
503 | return WRITE_TRAN_CONTINUE; | |
504 | ||
505 | case TLS_ST_SW_FINISHED: | |
506 | if (s->hit) { | |
507 | return WRITE_TRAN_FINISHED; | |
508 | } | |
509 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 510 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
511 | return WRITE_TRAN_CONTINUE; |
512 | ||
513 | default: | |
514 | /* Shouldn't happen */ | |
515 | return WRITE_TRAN_ERROR; | |
516 | } | |
517 | } | |
518 | ||
519 | /* | |
520 | * Perform any pre work that needs to be done prior to sending a message from | |
521 | * the server to the client. | |
522 | */ | |
523 | enum WORK_STATE server_pre_work(SSL *s, enum WORK_STATE wst) | |
524 | { | |
d6f1a6e9 | 525 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
526 | |
527 | switch(st->hand_state) { | |
528 | case TLS_ST_SW_HELLO_REQ: | |
529 | s->shutdown = 0; | |
530 | if (SSL_IS_DTLS(s)) | |
531 | dtls1_clear_record_buffer(s); | |
532 | break; | |
533 | ||
534 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
535 | s->shutdown = 0; | |
536 | if (SSL_IS_DTLS(s)) { | |
537 | dtls1_clear_record_buffer(s); | |
538 | /* We don't buffer this message so don't use the timer */ | |
539 | st->use_timer = 0; | |
540 | } | |
541 | break; | |
542 | ||
543 | case TLS_ST_SW_SRVR_HELLO: | |
544 | if (SSL_IS_DTLS(s)) { | |
545 | /* | |
546 | * Messages we write from now on should be bufferred and | |
547 | * retransmitted if necessary, so we need to use the timer now | |
548 | */ | |
549 | st->use_timer = 1; | |
550 | } | |
551 | break; | |
552 | ||
553 | case TLS_ST_SW_SRVR_DONE: | |
554 | #ifndef OPENSSL_NO_SCTP | |
555 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
556 | return dtls_wait_for_dry(s); | |
557 | #endif | |
558 | return WORK_FINISHED_CONTINUE; | |
559 | ||
560 | case TLS_ST_SW_SESSION_TICKET: | |
561 | if (SSL_IS_DTLS(s)) { | |
562 | /* | |
563 | * We're into the last flight. We don't retransmit the last flight | |
564 | * unless we need to, so we don't use the timer | |
565 | */ | |
566 | st->use_timer = 0; | |
567 | } | |
568 | break; | |
569 | ||
570 | case TLS_ST_SW_CHANGE: | |
571 | s->session->cipher = s->s3->tmp.new_cipher; | |
572 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 573 | ossl_statem_set_error(s); |
61ae935a MC |
574 | return WORK_ERROR; |
575 | } | |
576 | if (SSL_IS_DTLS(s)) { | |
577 | /* | |
578 | * We're into the last flight. We don't retransmit the last flight | |
579 | * unless we need to, so we don't use the timer. This might have | |
580 | * already been set to 0 if we sent a NewSessionTicket message, | |
581 | * but we'll set it again here in case we didn't. | |
582 | */ | |
583 | st->use_timer = 0; | |
584 | } | |
585 | return WORK_FINISHED_CONTINUE; | |
586 | ||
587 | case TLS_ST_OK: | |
588 | return tls_finish_handshake(s, wst); | |
589 | ||
590 | default: | |
591 | /* No pre work to be done */ | |
592 | break; | |
593 | } | |
594 | ||
595 | return WORK_FINISHED_CONTINUE; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Perform any work that needs to be done after sending a message from the | |
600 | * server to the client. | |
601 | */ | |
602 | enum WORK_STATE server_post_work(SSL *s, enum WORK_STATE wst) | |
603 | { | |
d6f1a6e9 | 604 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
605 | |
606 | s->init_num = 0; | |
607 | ||
608 | switch(st->hand_state) { | |
609 | case TLS_ST_SW_HELLO_REQ: | |
610 | if (statem_flush(s) != 1) | |
611 | return WORK_MORE_A; | |
612 | ssl3_init_finished_mac(s); | |
613 | break; | |
614 | ||
615 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
616 | if (statem_flush(s) != 1) | |
617 | return WORK_MORE_A; | |
618 | /* HelloVerifyRequest resets Finished MAC */ | |
619 | if (s->version != DTLS1_BAD_VER) | |
620 | ssl3_init_finished_mac(s); | |
621 | /* | |
622 | * The next message should be another ClientHello which we need to | |
623 | * treat like it was the first packet | |
624 | */ | |
625 | s->first_packet = 1; | |
626 | break; | |
627 | ||
628 | case TLS_ST_SW_SRVR_HELLO: | |
629 | #ifndef OPENSSL_NO_SCTP | |
630 | if (SSL_IS_DTLS(s) && s->hit) { | |
631 | unsigned char sctpauthkey[64]; | |
632 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
633 | ||
634 | /* | |
635 | * Add new shared key for SCTP-Auth, will be ignored if no | |
636 | * SCTP used. | |
637 | */ | |
638 | snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), | |
639 | DTLS1_SCTP_AUTH_LABEL); | |
640 | ||
641 | if (SSL_export_keying_material(s, sctpauthkey, | |
642 | sizeof(sctpauthkey), labelbuffer, | |
643 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 644 | ossl_statem_set_error(s); |
61ae935a MC |
645 | return WORK_ERROR; |
646 | } | |
647 | ||
648 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
649 | sizeof(sctpauthkey), sctpauthkey); | |
650 | } | |
651 | #endif | |
652 | break; | |
653 | ||
654 | case TLS_ST_SW_CHANGE: | |
655 | #ifndef OPENSSL_NO_SCTP | |
656 | if (SSL_IS_DTLS(s) && !s->hit) { | |
657 | /* | |
658 | * Change to new shared key of SCTP-Auth, will be ignored if | |
659 | * no SCTP used. | |
660 | */ | |
661 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
662 | 0, NULL); | |
663 | } | |
664 | #endif | |
665 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
666 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { | |
fe3a3291 | 667 | ossl_statem_set_error(s); |
61ae935a MC |
668 | return WORK_ERROR; |
669 | } | |
670 | ||
671 | if (SSL_IS_DTLS(s)) | |
672 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
673 | break; | |
674 | ||
675 | case TLS_ST_SW_SRVR_DONE: | |
676 | if (statem_flush(s) != 1) | |
677 | return WORK_MORE_A; | |
678 | break; | |
679 | ||
680 | case TLS_ST_SW_FINISHED: | |
681 | if (statem_flush(s) != 1) | |
682 | return WORK_MORE_A; | |
683 | #ifndef OPENSSL_NO_SCTP | |
684 | if (SSL_IS_DTLS(s) && s->hit) { | |
685 | /* | |
686 | * Change to new shared key of SCTP-Auth, will be ignored if | |
687 | * no SCTP used. | |
688 | */ | |
689 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
690 | 0, NULL); | |
691 | } | |
692 | #endif | |
693 | break; | |
694 | ||
695 | default: | |
696 | /* No post work to be done */ | |
697 | break; | |
698 | } | |
699 | ||
700 | return WORK_FINISHED_CONTINUE; | |
701 | } | |
702 | ||
703 | /* | |
704 | * Construct a message to be sent from the server to the client. | |
705 | * | |
706 | * Valid return values are: | |
707 | * 1: Success | |
708 | * 0: Error | |
709 | */ | |
710 | int server_construct_message(SSL *s) | |
711 | { | |
d6f1a6e9 | 712 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
713 | |
714 | switch(st->hand_state) { | |
715 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
716 | return dtls_construct_hello_verify_request(s); | |
717 | ||
718 | case TLS_ST_SW_HELLO_REQ: | |
719 | return tls_construct_hello_request(s); | |
720 | ||
721 | case TLS_ST_SW_SRVR_HELLO: | |
722 | return tls_construct_server_hello(s); | |
723 | ||
724 | case TLS_ST_SW_CERT: | |
725 | return tls_construct_server_certificate(s); | |
726 | ||
727 | case TLS_ST_SW_KEY_EXCH: | |
728 | return tls_construct_server_key_exchange(s); | |
729 | ||
730 | case TLS_ST_SW_CERT_REQ: | |
731 | return tls_construct_certificate_request(s); | |
732 | ||
733 | case TLS_ST_SW_SRVR_DONE: | |
734 | return tls_construct_server_done(s); | |
735 | ||
736 | case TLS_ST_SW_SESSION_TICKET: | |
737 | return tls_construct_new_session_ticket(s); | |
738 | ||
739 | case TLS_ST_SW_CERT_STATUS: | |
740 | return tls_construct_cert_status(s); | |
741 | ||
742 | case TLS_ST_SW_CHANGE: | |
743 | if (SSL_IS_DTLS(s)) | |
744 | return dtls_construct_change_cipher_spec(s); | |
745 | else | |
746 | return tls_construct_change_cipher_spec(s); | |
747 | ||
748 | case TLS_ST_SW_FINISHED: | |
749 | return tls_construct_finished(s, | |
750 | s->method-> | |
751 | ssl3_enc->server_finished_label, | |
752 | s->method-> | |
753 | ssl3_enc->server_finished_label_len); | |
754 | ||
755 | default: | |
756 | /* Shouldn't happen */ | |
757 | break; | |
758 | } | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 | |
764 | #define NEXT_PROTO_MAX_LENGTH 514 | |
765 | ||
766 | /* | |
767 | * Returns the maximum allowed length for the current message that we are | |
768 | * reading. Excludes the message header. | |
769 | */ | |
770 | unsigned long server_max_message_size(SSL *s) | |
771 | { | |
d6f1a6e9 | 772 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
773 | |
774 | switch(st->hand_state) { | |
775 | case TLS_ST_SR_CLNT_HELLO: | |
776 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
777 | ||
778 | case TLS_ST_SR_CERT: | |
779 | return s->max_cert_list; | |
780 | ||
781 | case TLS_ST_SR_KEY_EXCH: | |
782 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
783 | ||
784 | case TLS_ST_SR_CERT_VRFY: | |
785 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
786 | ||
787 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
788 | case TLS_ST_SR_NEXT_PROTO: | |
789 | return NEXT_PROTO_MAX_LENGTH; | |
790 | #endif | |
791 | ||
792 | case TLS_ST_SR_CHANGE: | |
793 | return CCS_MAX_LENGTH; | |
794 | ||
795 | case TLS_ST_SR_FINISHED: | |
796 | return FINISHED_MAX_LENGTH; | |
797 | ||
798 | default: | |
799 | /* Shouldn't happen */ | |
800 | break; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | /* | |
807 | * Process a message that the server has received from the client. | |
808 | */ | |
809 | enum MSG_PROCESS_RETURN server_process_message(SSL *s, PACKET *pkt) | |
810 | { | |
d6f1a6e9 | 811 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
812 | |
813 | switch(st->hand_state) { | |
814 | case TLS_ST_SR_CLNT_HELLO: | |
815 | return tls_process_client_hello(s, pkt); | |
816 | ||
817 | case TLS_ST_SR_CERT: | |
818 | return tls_process_client_certificate(s, pkt); | |
819 | ||
820 | case TLS_ST_SR_KEY_EXCH: | |
821 | return tls_process_client_key_exchange(s, pkt); | |
822 | ||
823 | case TLS_ST_SR_CERT_VRFY: | |
824 | return tls_process_cert_verify(s, pkt); | |
825 | ||
826 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
827 | case TLS_ST_SR_NEXT_PROTO: | |
828 | return tls_process_next_proto(s, pkt); | |
829 | #endif | |
830 | ||
831 | case TLS_ST_SR_CHANGE: | |
832 | return tls_process_change_cipher_spec(s, pkt); | |
833 | ||
834 | case TLS_ST_SR_FINISHED: | |
835 | return tls_process_finished(s, pkt); | |
836 | ||
837 | default: | |
838 | /* Shouldn't happen */ | |
839 | break; | |
840 | } | |
841 | ||
842 | return MSG_PROCESS_ERROR; | |
843 | } | |
844 | ||
845 | /* | |
846 | * Perform any further processing required following the receipt of a message | |
847 | * from the client | |
848 | */ | |
849 | enum WORK_STATE server_post_process_message(SSL *s, enum WORK_STATE wst) | |
850 | { | |
d6f1a6e9 | 851 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
852 | |
853 | switch(st->hand_state) { | |
854 | case TLS_ST_SR_CLNT_HELLO: | |
855 | return tls_post_process_client_hello(s, wst); | |
856 | ||
857 | case TLS_ST_SR_KEY_EXCH: | |
858 | return tls_post_process_client_key_exchange(s, wst); | |
859 | ||
860 | case TLS_ST_SR_CERT_VRFY: | |
861 | #ifndef OPENSSL_NO_SCTP | |
862 | if ( /* Is this SCTP? */ | |
863 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
864 | /* Are we renegotiating? */ | |
865 | && s->renegotiate | |
866 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
867 | s->s3->in_read_app_data = 2; | |
868 | s->rwstate = SSL_READING; | |
869 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
870 | BIO_set_retry_read(SSL_get_rbio(s)); | |
871 | statem_set_sctp_read_sock(s, 1); | |
872 | return WORK_MORE_A; | |
873 | } else { | |
fe3a3291 | 874 | ossl_ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
875 | } |
876 | #endif | |
877 | return WORK_FINISHED_CONTINUE; | |
878 | ||
879 | ||
880 | case TLS_ST_SR_FINISHED: | |
881 | if (s->hit) | |
882 | return tls_finish_handshake(s, wst); | |
883 | else | |
884 | return WORK_FINISHED_STOP; | |
885 | default: | |
886 | break; | |
887 | } | |
888 | ||
889 | /* Shouldn't happen */ | |
890 | return WORK_ERROR; | |
891 | } | |
892 | ||
edc032b5 | 893 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 894 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
895 | { |
896 | int ret = SSL_ERROR_NONE; | |
897 | ||
898 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
899 | ||
900 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
901 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
902 | if (s->srp_ctx.login == NULL) { | |
903 | /* | |
904 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
905 | * login name | |
906 | */ | |
907 | ret = SSL3_AL_FATAL; | |
908 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
909 | } else { | |
910 | ret = SSL_srp_server_param_with_username(s, al); | |
911 | } | |
912 | } | |
913 | return ret; | |
914 | } | |
edc032b5 BL |
915 | #endif |
916 | ||
e27f234a MC |
917 | int tls_construct_hello_request(SSL *s) |
918 | { | |
919 | if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) { | |
920 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 921 | ossl_statem_set_error(s); |
e27f234a MC |
922 | return 0; |
923 | } | |
924 | ||
925 | return 1; | |
926 | } | |
927 | ||
8ba708e5 MC |
928 | unsigned int dtls_raw_hello_verify_request(unsigned char *buf, |
929 | unsigned char *cookie, | |
930 | unsigned char cookie_len) | |
931 | { | |
932 | unsigned int msg_len; | |
933 | unsigned char *p; | |
934 | ||
935 | p = buf; | |
936 | /* Always use DTLS 1.0 version: see RFC 6347 */ | |
937 | *(p++) = DTLS1_VERSION >> 8; | |
938 | *(p++) = DTLS1_VERSION & 0xFF; | |
939 | ||
940 | *(p++) = (unsigned char)cookie_len; | |
941 | memcpy(p, cookie, cookie_len); | |
942 | p += cookie_len; | |
943 | msg_len = p - buf; | |
944 | ||
945 | return msg_len; | |
946 | } | |
947 | ||
948 | int dtls_construct_hello_verify_request(SSL *s) | |
949 | { | |
950 | unsigned int len; | |
951 | unsigned char *buf; | |
952 | ||
953 | buf = (unsigned char *)s->init_buf->data; | |
954 | ||
955 | if (s->ctx->app_gen_cookie_cb == NULL || | |
956 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
957 | &(s->d1->cookie_len)) == 0 || | |
958 | s->d1->cookie_len > 255) { | |
959 | SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, | |
960 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); | |
fe3a3291 | 961 | ossl_statem_set_error(s); |
8ba708e5 MC |
962 | return 0; |
963 | } | |
964 | ||
965 | len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH], | |
966 | s->d1->cookie, s->d1->cookie_len); | |
967 | ||
968 | dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, | |
969 | len); | |
970 | len += DTLS1_HM_HEADER_LENGTH; | |
971 | ||
972 | /* number of bytes to write */ | |
973 | s->init_num = len; | |
974 | s->init_off = 0; | |
975 | ||
976 | return 1; | |
977 | } | |
978 | ||
73999b62 | 979 | enum MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
980 | { |
981 | int i, al = SSL_AD_INTERNAL_ERROR; | |
982 | unsigned int j, complen = 0; | |
983 | unsigned long id; | |
984 | SSL_CIPHER *c; | |
985 | #ifndef OPENSSL_NO_COMP | |
986 | SSL_COMP *comp = NULL; | |
987 | #endif | |
988 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
989 | int protverr = 1; | |
990 | /* |cookie| will only be initialized for DTLS. */ | |
73999b62 | 991 | PACKET session_id, cipher_suites, compression, extensions, cookie; |
e27f234a MC |
992 | int is_v2_record; |
993 | ||
b3e2272c EK |
994 | is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
995 | ||
bbafa47b | 996 | PACKET_null_init(&cookie); |
32ec4153 | 997 | /* First lets get s->client_version set correctly */ |
b3e2272c | 998 | if (is_v2_record) { |
9ceb2426 MC |
999 | unsigned int version; |
1000 | unsigned int mt; | |
32ec4153 MC |
1001 | /*- |
1002 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
1003 | * header is sent directly on the wire, not wrapped as a TLS | |
1004 | * record. Our record layer just processes the message length and passes | |
1005 | * the rest right through. Its format is: | |
1006 | * Byte Content | |
1007 | * 0-1 msg_length - decoded by the record layer | |
1008 | * 2 msg_type - s->init_msg points here | |
1009 | * 3-4 version | |
1010 | * 5-6 cipher_spec_length | |
1011 | * 7-8 session_id_length | |
1012 | * 9-10 challenge_length | |
1013 | * ... ... | |
1014 | */ | |
1015 | ||
73999b62 | 1016 | if (!PACKET_get_1(pkt, &mt) |
9ceb2426 | 1017 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
1018 | /* |
1019 | * Should never happen. We should have tested this in the record | |
1020 | * layer in order to have determined that this is a SSLv2 record | |
1021 | * in the first place | |
1022 | */ | |
e27f234a | 1023 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 1024 | goto err; |
32ec4153 MC |
1025 | } |
1026 | ||
73999b62 | 1027 | if (!PACKET_get_net_2(pkt, &version)) { |
9ceb2426 | 1028 | /* No protocol version supplied! */ |
e27f234a | 1029 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
9ceb2426 MC |
1030 | goto err; |
1031 | } | |
1032 | if (version == 0x0002) { | |
32ec4153 | 1033 | /* This is real SSLv2. We don't support it. */ |
e27f234a | 1034 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1035 | goto err; |
9ceb2426 | 1036 | } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) { |
32ec4153 | 1037 | /* SSLv3/TLS */ |
9ceb2426 | 1038 | s->client_version = version; |
32ec4153 MC |
1039 | } else { |
1040 | /* No idea what protocol this is */ | |
e27f234a | 1041 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 MC |
1042 | goto err; |
1043 | } | |
1044 | } else { | |
1045 | /* | |
9ceb2426 MC |
1046 | * use version from inside client hello, not from record header (may |
1047 | * differ: see RFC 2246, Appendix E, second paragraph) | |
32ec4153 | 1048 | */ |
73999b62 | 1049 | if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) { |
32ec4153 | 1050 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 1051 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); |
32ec4153 MC |
1052 | goto f_err; |
1053 | } | |
5e9f0eeb MC |
1054 | } |
1055 | ||
32ec4153 MC |
1056 | /* Do SSL/TLS version negotiation if applicable */ |
1057 | if (!SSL_IS_DTLS(s)) { | |
1058 | if (s->version != TLS_ANY_VERSION) { | |
b2ce0337 | 1059 | if (s->client_version >= s->version) { |
32ec4153 MC |
1060 | protverr = 0; |
1061 | } | |
b2ce0337 | 1062 | } else if (s->client_version >= SSL3_VERSION) { |
32ec4153 MC |
1063 | switch(s->client_version) { |
1064 | default: | |
1065 | case TLS1_2_VERSION: | |
1066 | if(!(s->options & SSL_OP_NO_TLSv1_2)) { | |
1067 | s->version = TLS1_2_VERSION; | |
1068 | s->method = TLSv1_2_server_method(); | |
1069 | protverr = 0; | |
1070 | break; | |
1071 | } | |
1072 | /* Deliberately fall through */ | |
1073 | case TLS1_1_VERSION: | |
1074 | if(!(s->options & SSL_OP_NO_TLSv1_1)) { | |
1075 | s->version = TLS1_1_VERSION; | |
1076 | s->method = TLSv1_1_server_method(); | |
1077 | protverr = 0; | |
1078 | break; | |
1079 | } | |
1080 | /* Deliberately fall through */ | |
1081 | case TLS1_VERSION: | |
1082 | if(!(s->options & SSL_OP_NO_TLSv1)) { | |
1083 | s->version = TLS1_VERSION; | |
1084 | s->method = TLSv1_server_method(); | |
1085 | protverr = 0; | |
1086 | break; | |
1087 | } | |
1088 | /* Deliberately fall through */ | |
1089 | case SSL3_VERSION: | |
b2ce0337 | 1090 | #ifndef OPENSSL_NO_SSL3 |
32ec4153 MC |
1091 | if(!(s->options & SSL_OP_NO_SSLv3)) { |
1092 | s->version = SSL3_VERSION; | |
1093 | s->method = SSLv3_server_method(); | |
1094 | protverr = 0; | |
1095 | break; | |
1096 | } | |
b2ce0337 MC |
1097 | #else |
1098 | break; | |
1099 | #endif | |
32ec4153 MC |
1100 | } |
1101 | } | |
b2ce0337 MC |
1102 | } else if (s->client_version <= s->version |
1103 | || s->method->version == DTLS_ANY_VERSION) { | |
32ec4153 MC |
1104 | /* |
1105 | * For DTLS we just check versions are potentially compatible. Version | |
1106 | * negotiation comes later. | |
1107 | */ | |
1108 | protverr = 0; | |
1109 | } | |
1110 | ||
1111 | if (protverr) { | |
e27f234a | 1112 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 1113 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
1114 | /* |
1115 | * similar to ssl3_get_record, send alert using remote version | |
1116 | * number | |
1117 | */ | |
1118 | s->version = s->client_version; | |
1119 | } | |
1120 | al = SSL_AD_PROTOCOL_VERSION; | |
1121 | goto f_err; | |
1122 | } | |
1123 | ||
b3e2272c EK |
1124 | /* Parse the message and load client random. */ |
1125 | if (is_v2_record) { | |
32ec4153 MC |
1126 | /* |
1127 | * Handle an SSLv2 backwards compatible ClientHello | |
1128 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1129 | * Real SSLv2 is not supported, and is rejected above. | |
1130 | */ | |
ec30e856 | 1131 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1132 | PACKET challenge; |
0f113f3e | 1133 | |
73999b62 MC |
1134 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1135 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1136 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1137 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1138 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1139 | al = SSL_AD_DECODE_ERROR; |
1140 | goto f_err; | |
5e9f0eeb | 1141 | } |
0f113f3e | 1142 | |
73999b62 MC |
1143 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1144 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1145 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1146 | /* No extensions. */ |
73999b62 | 1147 | || PACKET_remaining(pkt) != 0) { |
9ceb2426 MC |
1148 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_RECORD_LENGTH_MISMATCH); |
1149 | al = SSL_AD_DECODE_ERROR; | |
1150 | goto f_err; | |
1151 | } | |
1152 | ||
32ec4153 | 1153 | /* Load the client random */ |
b3e2272c EK |
1154 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1155 | challenge_len; | |
32ec4153 | 1156 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1157 | if (!PACKET_copy_bytes(&challenge, |
1158 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
1159 | challenge_len, challenge_len)) { | |
1160 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); | |
1161 | al = SSL_AD_INTERNAL_ERROR; | |
9ceb2426 MC |
1162 | goto f_err; |
1163 | } | |
b3e2272c EK |
1164 | |
1165 | PACKET_null_init(&compression); | |
1166 | PACKET_null_init(&extensions); | |
0f113f3e | 1167 | } else { |
b3e2272c | 1168 | /* Regular ClientHello. */ |
73999b62 MC |
1169 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1170 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1171 | al = SSL_AD_DECODE_ERROR; |
b3e2272c | 1172 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1173 | goto f_err; |
1174 | } | |
32ec4153 | 1175 | |
b3e2272c | 1176 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1177 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1178 | al = SSL_AD_DECODE_ERROR; |
b3e2272c | 1179 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1180 | goto f_err; |
1181 | } | |
b3e2272c EK |
1182 | /* |
1183 | * If we require cookies and this ClientHello doesn't contain one, | |
1184 | * just return since we do not want to allocate any memory yet. | |
1185 | * So check cookie length... | |
1186 | */ | |
1187 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1188 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1189 | return 1; |
b3e2272c | 1190 | } |
5e9f0eeb | 1191 | } |
0f113f3e | 1192 | |
73999b62 MC |
1193 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1194 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c EK |
1195 | al = SSL_AD_DECODE_ERROR; |
1196 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1197 | goto f_err; | |
1198 | } | |
1199 | /* Could be empty. */ | |
73999b62 | 1200 | extensions = *pkt; |
b3e2272c EK |
1201 | } |
1202 | ||
1203 | s->hit = 0; | |
1204 | ||
1205 | /* | |
1206 | * We don't allow resumption in a backwards compatible ClientHello. | |
1207 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1208 | * | |
1209 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1210 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1211 | * ignore resumption requests with flag | |
1212 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1213 | * than a change to default behavior so that applications relying on | |
1214 | * this for security won't even compile against older library versions). | |
1215 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1216 | * request renegotiation but not a new session (s->new_session remains | |
1217 | * unset): for servers, this essentially just means that the | |
1218 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1219 | * ignored. | |
1220 | */ | |
1221 | if (is_v2_record || | |
1222 | (s->new_session && | |
1223 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1224 | if (!ssl_get_new_session(s, 1)) | |
1225 | goto err; | |
1226 | } else { | |
1227 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1228 | /* |
b3e2272c EK |
1229 | * Only resume if the session's version matches the negotiated |
1230 | * version. | |
1231 | * RFC 5246 does not provide much useful advice on resumption | |
1232 | * with a different protocol version. It doesn't forbid it but | |
1233 | * the sanity of such behaviour would be questionable. | |
1234 | * In practice, clients do not accept a version mismatch and | |
1235 | * will abort the handshake with an error. | |
0f113f3e | 1236 | */ |
b3e2272c EK |
1237 | if (i == 1 && s->version == s->session->ssl_version) { |
1238 | /* previous session */ | |
1239 | s->hit = 1; | |
1240 | } else if (i == -1) { | |
1241 | goto err; | |
32ec4153 | 1242 | } else { |
b3e2272c EK |
1243 | /* i == 0 */ |
1244 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1245 | goto err; |
0f113f3e | 1246 | } |
b3e2272c | 1247 | } |
0f113f3e | 1248 | |
b3e2272c | 1249 | if (SSL_IS_DTLS(s)) { |
e27f234a | 1250 | /* Empty cookie was already handled above by returning early. */ |
31011544 | 1251 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { |
b3e2272c | 1252 | if (s->ctx->app_verify_cookie_cb != NULL) { |
31011544 EK |
1253 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), |
1254 | PACKET_remaining(&cookie)) == 0) { | |
32ec4153 | 1255 | al = SSL_AD_HANDSHAKE_FAILURE; |
32ec4153 | 1256 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, |
b3e2272c | 1257 | SSL_R_COOKIE_MISMATCH); |
32ec4153 | 1258 | goto f_err; |
31011544 | 1259 | /* else cookie verification succeeded */ |
32ec4153 | 1260 | } |
b3e2272c | 1261 | /* default verification */ |
31011544 EK |
1262 | } else if (!PACKET_equal(&cookie, s->d1->cookie, |
1263 | s->d1->cookie_len)) { | |
b3e2272c EK |
1264 | al = SSL_AD_HANDSHAKE_FAILURE; |
1265 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); | |
1266 | goto f_err; | |
32ec4153 | 1267 | } |
e27f234a | 1268 | s->d1->cookie_verified = 1; |
0f113f3e | 1269 | } |
b3e2272c EK |
1270 | if (s->method->version == DTLS_ANY_VERSION) { |
1271 | /* Select version to use */ | |
1272 | if (s->client_version <= DTLS1_2_VERSION && | |
1273 | !(s->options & SSL_OP_NO_DTLSv1_2)) { | |
1274 | s->version = DTLS1_2_VERSION; | |
1275 | s->method = DTLSv1_2_server_method(); | |
1276 | } else if (tls1_suiteb(s)) { | |
1277 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, | |
1278 | SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); | |
1279 | s->version = s->client_version; | |
1280 | al = SSL_AD_PROTOCOL_VERSION; | |
1281 | goto f_err; | |
1282 | } else if (s->client_version <= DTLS1_VERSION && | |
1283 | !(s->options & SSL_OP_NO_DTLSv1)) { | |
1284 | s->version = DTLS1_VERSION; | |
1285 | s->method = DTLSv1_server_method(); | |
1286 | } else { | |
1287 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, | |
1288 | SSL_R_WRONG_VERSION_NUMBER); | |
1289 | s->version = s->client_version; | |
1290 | al = SSL_AD_PROTOCOL_VERSION; | |
1291 | goto f_err; | |
1292 | } | |
1293 | s->session->ssl_version = s->version; | |
32ec4153 | 1294 | } |
b3e2272c | 1295 | } |
3ae91cfb | 1296 | |
38a3cbfb EK |
1297 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1298 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1299 | goto f_err; |
1300 | } | |
5e9f0eeb | 1301 | |
b3e2272c EK |
1302 | /* If it is a hit, check that the cipher is in the list */ |
1303 | if (s->hit) { | |
1304 | j = 0; | |
1305 | id = s->session->cipher->id; | |
d02b48c6 | 1306 | |
413c4f45 | 1307 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1308 | fprintf(stderr, "client sent %d ciphers\n", |
1309 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1310 | #endif |
b3e2272c EK |
1311 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1312 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1313 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1314 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1315 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1316 | #endif |
b3e2272c EK |
1317 | if (c->id == id) { |
1318 | j = 1; | |
1319 | break; | |
32ec4153 | 1320 | } |
0f113f3e | 1321 | } |
b3e2272c | 1322 | if (j == 0) { |
ec30e856 | 1323 | /* |
b3e2272c EK |
1324 | * we need to have the cipher in the cipher list if we are asked |
1325 | * to reuse it | |
ec30e856 | 1326 | */ |
b3e2272c EK |
1327 | al = SSL_AD_ILLEGAL_PARAMETER; |
1328 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, | |
1329 | SSL_R_REQUIRED_CIPHER_MISSING); | |
32ec4153 MC |
1330 | goto f_err; |
1331 | } | |
b3e2272c | 1332 | } |
9ceb2426 | 1333 | |
b3e2272c EK |
1334 | complen = PACKET_remaining(&compression); |
1335 | for (j = 0; j < complen; j++) { | |
1336 | if (PACKET_data(&compression)[j] == 0) | |
1337 | break; | |
0f113f3e | 1338 | } |
32ec4153 | 1339 | |
b3e2272c EK |
1340 | if (j >= complen) { |
1341 | /* no compress */ | |
1342 | al = SSL_AD_DECODE_ERROR; | |
1343 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); | |
1344 | goto f_err; | |
1345 | } | |
1346 | ||
0f113f3e MC |
1347 | /* TLS extensions */ |
1348 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1349 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
0f113f3e MC |
1350 | SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
1351 | goto err; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * Check if we want to use external pre-shared secret for this handshake | |
1357 | * for not reused session only. We need to generate server_random before | |
1358 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1359 | * processing to use it in key derivation. | |
1360 | */ | |
1361 | { | |
1362 | unsigned char *pos; | |
1363 | pos = s->s3->server_random; | |
1364 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1365 | goto f_err; | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
1370 | SSL_CIPHER *pref_cipher = NULL; | |
1371 | ||
1372 | s->session->master_key_length = sizeof(s->session->master_key); | |
1373 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1374 | &s->session->master_key_length, ciphers, | |
1375 | &pref_cipher, | |
1376 | s->tls_session_secret_cb_arg)) { | |
1377 | s->hit = 1; | |
1378 | s->session->ciphers = ciphers; | |
1379 | s->session->verify_result = X509_V_OK; | |
1380 | ||
1381 | ciphers = NULL; | |
1382 | ||
1383 | /* check if some cipher was preferred by call back */ | |
1384 | pref_cipher = | |
1385 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1386 | s-> | |
1387 | session->ciphers, | |
1388 | SSL_get_ciphers | |
1389 | (s)); | |
1390 | if (pref_cipher == NULL) { | |
1391 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1392 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1393 | goto f_err; |
1394 | } | |
1395 | ||
1396 | s->session->cipher = pref_cipher; | |
25aaa98a | 1397 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1398 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1399 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1400 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1401 | } | |
1402 | } | |
58ece833 | 1403 | |
0f113f3e MC |
1404 | /* |
1405 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1406 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1407 | * algorithms from the client, starting at q. |
1408 | */ | |
1409 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1410 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1411 | /* This only happens if we have a cache hit */ |
1412 | if (s->session->compress_meth != 0) { | |
1413 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1414 | unsigned int k; |
0f113f3e MC |
1415 | /* Perform sanity checks on resumed compression algorithm */ |
1416 | /* Can't disable compression */ | |
1417 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1418 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1419 | SSL_R_INCONSISTENT_COMPRESSION); |
1420 | goto f_err; | |
1421 | } | |
1422 | /* Look for resumed compression method */ | |
1423 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1424 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1425 | if (comp_id == comp->id) { | |
1426 | s->s3->tmp.new_compression = comp; | |
1427 | break; | |
1428 | } | |
1429 | } | |
1430 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1431 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1432 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1433 | goto f_err; | |
1434 | } | |
1435 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1436 | for (k = 0; k < complen; k++) { |
ec30e856 | 1437 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1438 | break; |
1439 | } | |
9ceb2426 | 1440 | if (k >= complen) { |
0f113f3e | 1441 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1442 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1443 | SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING); |
1444 | goto f_err; | |
1445 | } | |
1446 | } else if (s->hit) | |
1447 | comp = NULL; | |
1448 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1449 | /* See if we have a match */ |
9ceb2426 MC |
1450 | int m, nn, v, done = 0; |
1451 | unsigned int o; | |
0f113f3e MC |
1452 | |
1453 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1454 | for (m = 0; m < nn; m++) { | |
1455 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1456 | v = comp->id; | |
b2ce0337 | 1457 | for (o = 0; o < complen; o++) { |
ec30e856 | 1458 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1459 | done = 1; |
1460 | break; | |
1461 | } | |
1462 | } | |
1463 | if (done) | |
1464 | break; | |
1465 | } | |
1466 | if (done) | |
1467 | s->s3->tmp.new_compression = comp; | |
1468 | else | |
1469 | comp = NULL; | |
1470 | } | |
e6f418bc | 1471 | #else |
0f113f3e MC |
1472 | /* |
1473 | * If compression is disabled we'd better not try to resume a session | |
1474 | * using compression. | |
1475 | */ | |
1476 | if (s->session->compress_meth != 0) { | |
e27f234a | 1477 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1478 | goto f_err; |
1479 | } | |
09b6c2ef | 1480 | #endif |
413c4f45 | 1481 | |
0f113f3e MC |
1482 | /* |
1483 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1484 | */ | |
d02b48c6 | 1485 | |
0f113f3e | 1486 | if (!s->hit) { |
09b6c2ef | 1487 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1488 | s->session->compress_meth = 0; |
09b6c2ef | 1489 | #else |
0f113f3e | 1490 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1491 | #endif |
25aaa98a | 1492 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1493 | s->session->ciphers = ciphers; |
1494 | if (ciphers == NULL) { | |
3ae91cfb | 1495 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1496 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1497 | goto f_err; |
1498 | } | |
1499 | ciphers = NULL; | |
1500 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1501 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1502 | goto err; |
1503 | } | |
e27f234a MC |
1504 | } |
1505 | ||
1506 | sk_SSL_CIPHER_free(ciphers); | |
1507 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1508 | f_err: | |
1509 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1510 | err: | |
fe3a3291 | 1511 | ossl_statem_set_error(s); |
e27f234a MC |
1512 | |
1513 | sk_SSL_CIPHER_free(ciphers); | |
1514 | return MSG_PROCESS_ERROR; | |
1515 | ||
1516 | } | |
1517 | ||
1518 | enum WORK_STATE tls_post_process_client_hello(SSL *s, enum WORK_STATE wst) | |
1519 | { | |
1520 | int al; | |
1521 | SSL_CIPHER *cipher; | |
1522 | ||
1523 | if (wst == WORK_MORE_A) { | |
1524 | if (!s->hit) { | |
1525 | /* Let cert callback update server certificates if required */ | |
1526 | if (s->cert->cert_cb) { | |
1527 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1528 | if (rv == 0) { | |
1529 | al = SSL_AD_INTERNAL_ERROR; | |
1530 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1531 | goto f_err; | |
1532 | } | |
1533 | if (rv < 0) { | |
1534 | s->rwstate = SSL_X509_LOOKUP; | |
1535 | return WORK_MORE_A; | |
1536 | } | |
1537 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1538 | } |
e27f234a MC |
1539 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1540 | ||
1541 | if (cipher == NULL) { | |
1542 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1543 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); | |
1544 | goto f_err; | |
0f113f3e | 1545 | } |
e27f234a MC |
1546 | s->s3->tmp.new_cipher = cipher; |
1547 | /* check whether we should disable session resumption */ | |
1548 | if (s->not_resumable_session_cb != NULL) | |
1549 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1550 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1551 | if (s->session->not_resumable) | |
1552 | /* do not send a session ticket */ | |
1553 | s->tlsext_ticket_expected = 0; | |
1554 | } else { | |
1555 | /* Session-id reuse */ | |
1556 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1557 | } |
0f113f3e | 1558 | |
e27f234a MC |
1559 | if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) { |
1560 | if (!ssl3_digest_cached_records(s, 0)) | |
1561 | goto f_err; | |
0f113f3e | 1562 | } |
0f113f3e | 1563 | |
e27f234a MC |
1564 | /*- |
1565 | * we now have the following setup. | |
1566 | * client_random | |
1567 | * cipher_list - our prefered list of ciphers | |
1568 | * ciphers - the clients prefered list of ciphers | |
1569 | * compression - basically ignored right now | |
1570 | * ssl version is set - sslv3 | |
1571 | * s->session - The ssl session has been setup. | |
1572 | * s->hit - session reuse flag | |
1573 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1574 | */ | |
0f113f3e | 1575 | |
e27f234a MC |
1576 | /* Handles TLS extensions that we couldn't check earlier */ |
1577 | if (s->version >= SSL3_VERSION) { | |
1578 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
1579 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); | |
1580 | goto f_err; | |
1581 | } | |
1582 | } | |
0f113f3e | 1583 | |
e27f234a MC |
1584 | wst = WORK_MORE_B; |
1585 | } | |
1586 | #ifndef OPENSSL_NO_SRP | |
1587 | if (wst == WORK_MORE_B) { | |
1588 | int ret; | |
1589 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1590 | /* | |
1591 | * callback indicates further work to be done | |
1592 | */ | |
1593 | s->rwstate = SSL_X509_LOOKUP; | |
1594 | return WORK_MORE_B; | |
1595 | } | |
1596 | if (ret != SSL_ERROR_NONE) { | |
1597 | /* | |
1598 | * This is not really an error but the only means to for | |
1599 | * a client to detect whether srp is supported. | |
1600 | */ | |
1601 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1602 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1603 | SSL_R_CLIENTHELLO_TLSEXT); | |
1604 | goto f_err; | |
0f113f3e MC |
1605 | } |
1606 | } | |
e27f234a MC |
1607 | #endif |
1608 | s->renegotiate = 2; | |
0f113f3e | 1609 | |
e27f234a | 1610 | return WORK_FINISHED_STOP; |
0f113f3e | 1611 | f_err: |
e27f234a | 1612 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1613 | ossl_statem_set_error(s); |
e27f234a MC |
1614 | return WORK_ERROR; |
1615 | } | |
1616 | ||
e27f234a | 1617 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1618 | { |
1619 | unsigned char *buf; | |
1620 | unsigned char *p, *d; | |
1621 | int i, sl; | |
1622 | int al = 0; | |
1623 | unsigned long l; | |
1624 | ||
e27f234a | 1625 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1626 | |
e27f234a MC |
1627 | /* Do the message type and length last */ |
1628 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1629 | |
e27f234a MC |
1630 | *(p++) = s->version >> 8; |
1631 | *(p++) = s->version & 0xff; | |
0f113f3e | 1632 | |
e27f234a MC |
1633 | /* |
1634 | * Random stuff. Filling of the server_random takes place in | |
1635 | * tls_process_client_hello() | |
1636 | */ | |
1637 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1638 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1639 | |
e27f234a MC |
1640 | /*- |
1641 | * There are several cases for the session ID to send | |
1642 | * back in the server hello: | |
1643 | * - For session reuse from the session cache, | |
1644 | * we send back the old session ID. | |
1645 | * - If stateless session reuse (using a session ticket) | |
1646 | * is successful, we send back the client's "session ID" | |
1647 | * (which doesn't actually identify the session). | |
1648 | * - If it is a new session, we send back the new | |
1649 | * session ID. | |
1650 | * - However, if we want the new session to be single-use, | |
1651 | * we send back a 0-length session ID. | |
1652 | * s->hit is non-zero in either case of session reuse, | |
1653 | * so the following won't overwrite an ID that we're supposed | |
1654 | * to send back. | |
1655 | */ | |
1656 | if (s->session->not_resumable || | |
1657 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1658 | && !s->hit)) | |
1659 | s->session->session_id_length = 0; | |
1660 | ||
1661 | sl = s->session->session_id_length; | |
1662 | if (sl > (int)sizeof(s->session->session_id)) { | |
1663 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1664 | ossl_statem_set_error(s); |
e27f234a MC |
1665 | return 0; |
1666 | } | |
1667 | *(p++) = sl; | |
1668 | memcpy(p, s->session->session_id, sl); | |
1669 | p += sl; | |
0f113f3e | 1670 | |
e27f234a MC |
1671 | /* put the cipher */ |
1672 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1673 | p += i; | |
0f113f3e | 1674 | |
e27f234a | 1675 | /* put the compression method */ |
09b6c2ef | 1676 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1677 | *(p++) = 0; |
09b6c2ef | 1678 | #else |
e27f234a MC |
1679 | if (s->s3->tmp.new_compression == NULL) |
1680 | *(p++) = 0; | |
1681 | else | |
1682 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1683 | #endif |
e481f9b9 | 1684 | |
e27f234a MC |
1685 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1686 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1687 | ossl_statem_set_error(s); |
e27f234a MC |
1688 | return 0; |
1689 | } | |
1690 | if ((p = | |
1691 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1692 | &al)) == NULL) { | |
1693 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1694 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1695 | ossl_statem_set_error(s); |
e27f234a MC |
1696 | return 0; |
1697 | } | |
e481f9b9 | 1698 | |
e27f234a MC |
1699 | /* do the header */ |
1700 | l = (p - d); | |
1701 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1702 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1703 | ossl_statem_set_error(s); |
e27f234a | 1704 | return 0; |
0f113f3e | 1705 | } |
d02b48c6 | 1706 | |
e27f234a | 1707 | return 1; |
0f113f3e | 1708 | } |
d02b48c6 | 1709 | |
e27f234a MC |
1710 | int tls_construct_server_done(SSL *s) |
1711 | { | |
1712 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1713 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1714 | ossl_statem_set_error(s); |
e27f234a MC |
1715 | return 0; |
1716 | } | |
1717 | ||
1718 | if (!s->s3->tmp.cert_request) { | |
1719 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1720 | ossl_statem_set_error(s); |
e27f234a MC |
1721 | } |
1722 | } | |
1723 | ||
1724 | return 1; | |
1725 | } | |
1726 | ||
e27f234a | 1727 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1728 | { |
bc36ee62 | 1729 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
1730 | unsigned char *q; |
1731 | int j, num; | |
1732 | RSA *rsa; | |
1733 | unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; | |
1734 | unsigned int u; | |
d02b48c6 | 1735 | #endif |
bc36ee62 | 1736 | #ifndef OPENSSL_NO_DH |
0f113f3e | 1737 | DH *dh = NULL, *dhp; |
ea262260 | 1738 | #endif |
10bf4fc2 | 1739 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1740 | EC_KEY *ecdh = NULL, *ecdhp; |
1741 | unsigned char *encodedPoint = NULL; | |
1742 | int encodedlen = 0; | |
1743 | int curve_id = 0; | |
1744 | BN_CTX *bn_ctx = NULL; | |
d02b48c6 | 1745 | #endif |
0f113f3e MC |
1746 | EVP_PKEY *pkey; |
1747 | const EVP_MD *md = NULL; | |
1748 | unsigned char *p, *d; | |
1749 | int al, i; | |
1750 | unsigned long type; | |
1751 | int n; | |
1752 | CERT *cert; | |
1753 | BIGNUM *r[4]; | |
1754 | int nr[4], kn; | |
1755 | BUF_MEM *buf; | |
1756 | EVP_MD_CTX md_ctx; | |
1757 | ||
1758 | EVP_MD_CTX_init(&md_ctx); | |
0f113f3e | 1759 | |
e27f234a MC |
1760 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
1761 | cert = s->cert; | |
1762 | ||
1763 | buf = s->init_buf; | |
0f113f3e | 1764 | |
e27f234a MC |
1765 | r[0] = r[1] = r[2] = r[3] = NULL; |
1766 | n = 0; | |
85269210 | 1767 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1768 | if (type & SSL_PSK) { |
1769 | /* | |
1770 | * reserve size for record length and PSK identity hint | |
1771 | */ | |
1772 | n += 2; | |
1773 | if (s->cert->psk_identity_hint) | |
1774 | n += strlen(s->cert->psk_identity_hint); | |
1775 | } | |
1776 | /* Plain PSK or RSAPSK nothing to do */ | |
1777 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1778 | } else | |
85269210 | 1779 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1780 | #ifndef OPENSSL_NO_RSA |
e27f234a MC |
1781 | if (type & SSL_kRSA) { |
1782 | rsa = cert->rsa_tmp; | |
1783 | if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { | |
1784 | rsa = s->cert->rsa_tmp_cb(s, | |
1785 | SSL_C_IS_EXPORT(s->s3-> | |
1786 | tmp.new_cipher), | |
1787 | SSL_C_EXPORT_PKEYLENGTH(s->s3-> | |
1788 | tmp.new_cipher)); | |
0f113f3e MC |
1789 | if (rsa == NULL) { |
1790 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a MC |
1791 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1792 | SSL_R_ERROR_GENERATING_TMP_RSA_KEY); | |
0f113f3e MC |
1793 | goto f_err; |
1794 | } | |
e27f234a MC |
1795 | RSA_up_ref(rsa); |
1796 | cert->rsa_tmp = rsa; | |
1797 | } | |
1798 | if (rsa == NULL) { | |
1799 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1800 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1801 | SSL_R_MISSING_TMP_RSA_KEY); | |
1802 | goto f_err; | |
1803 | } | |
1804 | r[0] = rsa->n; | |
1805 | r[1] = rsa->e; | |
1806 | s->s3->tmp.use_rsa_tmp = 1; | |
1807 | } else | |
d02b48c6 | 1808 | #endif |
bc36ee62 | 1809 | #ifndef OPENSSL_NO_DH |
e27f234a MC |
1810 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
1811 | if (s->cert->dh_tmp_auto) { | |
1812 | dhp = ssl_get_auto_dh(s); | |
0f113f3e | 1813 | if (dhp == NULL) { |
e27f234a MC |
1814 | al = SSL_AD_INTERNAL_ERROR; |
1815 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1816 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1817 | goto f_err; |
0f113f3e | 1818 | } |
e27f234a MC |
1819 | } else |
1820 | dhp = cert->dh_tmp; | |
1821 | if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) | |
1822 | dhp = s->cert->dh_tmp_cb(s, | |
1823 | SSL_C_IS_EXPORT(s->s3-> | |
1824 | tmp.new_cipher), | |
1825 | SSL_C_EXPORT_PKEYLENGTH(s->s3-> | |
1826 | tmp.new_cipher)); | |
1827 | if (dhp == NULL) { | |
1828 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1829 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1830 | SSL_R_MISSING_TMP_DH_KEY); | |
1831 | goto f_err; | |
1832 | } | |
1833 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
1834 | DH_security_bits(dhp), 0, dhp)) { | |
1835 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1836 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1837 | SSL_R_DH_KEY_TOO_SMALL); | |
1838 | goto f_err; | |
1839 | } | |
1840 | if (s->s3->tmp.dh != NULL) { | |
1841 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1842 | ERR_R_INTERNAL_ERROR); | |
1843 | goto err; | |
1844 | } | |
0f113f3e | 1845 | |
e27f234a MC |
1846 | if (s->cert->dh_tmp_auto) |
1847 | dh = dhp; | |
1848 | else if ((dh = DHparams_dup(dhp)) == NULL) { | |
1849 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1850 | goto err; | |
1851 | } | |
1852 | ||
1853 | s->s3->tmp.dh = dh; | |
1854 | if ((dhp->pub_key == NULL || | |
1855 | dhp->priv_key == NULL || | |
1856 | (s->options & SSL_OP_SINGLE_DH_USE))) { | |
1857 | if (!DH_generate_key(dh)) { | |
1858 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
0f113f3e MC |
1859 | goto err; |
1860 | } | |
e27f234a MC |
1861 | } else { |
1862 | dh->pub_key = BN_dup(dhp->pub_key); | |
1863 | dh->priv_key = BN_dup(dhp->priv_key); | |
1864 | if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { | |
1865 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); | |
1866 | goto err; | |
0f113f3e | 1867 | } |
e27f234a MC |
1868 | } |
1869 | r[0] = dh->p; | |
1870 | r[1] = dh->g; | |
1871 | r[2] = dh->pub_key; | |
1872 | } else | |
d02b48c6 | 1873 | #endif |
10bf4fc2 | 1874 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1875 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1876 | const EC_GROUP *group; | |
0f113f3e | 1877 | |
e27f234a MC |
1878 | ecdhp = cert->ecdh_tmp; |
1879 | if (s->cert->ecdh_tmp_auto) { | |
1880 | /* Get NID of appropriate shared curve */ | |
1881 | int nid = tls1_shared_curve(s, -2); | |
1882 | if (nid != NID_undef) | |
1883 | ecdhp = EC_KEY_new_by_curve_name(nid); | |
1884 | } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) { | |
1885 | ecdhp = s->cert->ecdh_tmp_cb(s, | |
1886 | SSL_C_IS_EXPORT(s->s3-> | |
1887 | tmp.new_cipher), | |
1888 | SSL_C_EXPORT_PKEYLENGTH(s-> | |
1889 | s3->tmp.new_cipher)); | |
1890 | } | |
1891 | if (ecdhp == NULL) { | |
1892 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1893 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1894 | SSL_R_MISSING_TMP_ECDH_KEY); | |
1895 | goto f_err; | |
1896 | } | |
1897 | ||
1898 | if (s->s3->tmp.ecdh != NULL) { | |
1899 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1900 | ERR_R_INTERNAL_ERROR); | |
1901 | goto err; | |
1902 | } | |
1903 | ||
1904 | /* Duplicate the ECDH structure. */ | |
1905 | if (ecdhp == NULL) { | |
1906 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1907 | goto err; | |
1908 | } | |
1909 | if (s->cert->ecdh_tmp_auto) | |
1910 | ecdh = ecdhp; | |
1911 | else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) { | |
1912 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1913 | goto err; | |
1914 | } | |
0f113f3e | 1915 | |
e27f234a MC |
1916 | s->s3->tmp.ecdh = ecdh; |
1917 | if ((EC_KEY_get0_public_key(ecdh) == NULL) || | |
1918 | (EC_KEY_get0_private_key(ecdh) == NULL) || | |
1919 | (s->options & SSL_OP_SINGLE_ECDH_USE)) { | |
1920 | if (!EC_KEY_generate_key(ecdh)) { | |
1921 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1922 | ERR_R_ECDH_LIB); | |
0f113f3e MC |
1923 | goto err; |
1924 | } | |
e27f234a | 1925 | } |
0f113f3e | 1926 | |
e27f234a MC |
1927 | if (((group = EC_KEY_get0_group(ecdh)) == NULL) || |
1928 | (EC_KEY_get0_public_key(ecdh) == NULL) || | |
1929 | (EC_KEY_get0_private_key(ecdh) == NULL)) { | |
1930 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1931 | goto err; | |
1932 | } | |
0f113f3e | 1933 | |
e27f234a MC |
1934 | if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && |
1935 | (EC_GROUP_get_degree(group) > 163)) { | |
1936 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1937 | SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); | |
1938 | goto err; | |
1939 | } | |
0f113f3e | 1940 | |
e27f234a MC |
1941 | /* |
1942 | * XXX: For now, we only support ephemeral ECDH keys over named | |
1943 | * (not generic) curves. For supported named curves, curve_id is | |
1944 | * non-zero. | |
1945 | */ | |
1946 | if ((curve_id = | |
1947 | tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) | |
1948 | == 0) { | |
1949 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1950 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1951 | goto err; | |
1952 | } | |
0f113f3e | 1953 | |
e27f234a MC |
1954 | /* |
1955 | * Encode the public key. First check the size of encoding and | |
1956 | * allocate memory accordingly. | |
1957 | */ | |
1958 | encodedlen = EC_POINT_point2oct(group, | |
1959 | EC_KEY_get0_public_key(ecdh), | |
1960 | POINT_CONVERSION_UNCOMPRESSED, | |
1961 | NULL, 0, NULL); | |
1962 | ||
1963 | encodedPoint = (unsigned char *) | |
1964 | OPENSSL_malloc(encodedlen * sizeof(unsigned char)); | |
1965 | bn_ctx = BN_CTX_new(); | |
1966 | if ((encodedPoint == NULL) || (bn_ctx == NULL)) { | |
1967 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1968 | ERR_R_MALLOC_FAILURE); | |
1969 | goto err; | |
1970 | } | |
0f113f3e | 1971 | |
e27f234a MC |
1972 | encodedlen = EC_POINT_point2oct(group, |
1973 | EC_KEY_get0_public_key(ecdh), | |
1974 | POINT_CONVERSION_UNCOMPRESSED, | |
1975 | encodedPoint, encodedlen, bn_ctx); | |
0f113f3e | 1976 | |
e27f234a MC |
1977 | if (encodedlen == 0) { |
1978 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); | |
1979 | goto err; | |
1980 | } | |
0f113f3e | 1981 | |
e27f234a MC |
1982 | BN_CTX_free(bn_ctx); |
1983 | bn_ctx = NULL; | |
0f113f3e | 1984 | |
e27f234a MC |
1985 | /* |
1986 | * XXX: For now, we only support named (not generic) curves in | |
1987 | * ECDH ephemeral key exchanges. In this situation, we need four | |
1988 | * additional bytes to encode the entire ServerECDHParams | |
1989 | * structure. | |
1990 | */ | |
1991 | n += 4 + encodedlen; | |
0f113f3e | 1992 | |
e27f234a MC |
1993 | /* |
1994 | * We'll generate the serverKeyExchange message explicitly so we | |
1995 | * can set these to NULLs | |
1996 | */ | |
1997 | r[0] = NULL; | |
1998 | r[1] = NULL; | |
1999 | r[2] = NULL; | |
2000 | r[3] = NULL; | |
2001 | } else | |
10bf4fc2 | 2002 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 2003 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
2004 | if (type & SSL_kSRP) { |
2005 | if ((s->srp_ctx.N == NULL) || | |
2006 | (s->srp_ctx.g == NULL) || | |
2007 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
2008 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2009 | SSL_R_MISSING_SRP_PARAM); | |
2010 | goto err; | |
0f113f3e | 2011 | } |
e27f234a MC |
2012 | r[0] = s->srp_ctx.N; |
2013 | r[1] = s->srp_ctx.g; | |
2014 | r[2] = s->srp_ctx.s; | |
2015 | r[3] = s->srp_ctx.B; | |
2016 | } else | |
2017 | #endif | |
2018 | { | |
2019 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2020 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2021 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
2022 | goto f_err; | |
2023 | } | |
2024 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
2025 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 2026 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
2027 | if ((i == 2) && (type & SSL_kSRP)) |
2028 | n += 1 + nr[i]; | |
2029 | else | |
edc032b5 | 2030 | #endif |
e27f234a MC |
2031 | n += 2 + nr[i]; |
2032 | } | |
0f113f3e | 2033 | |
e27f234a MC |
2034 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
2035 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
2036 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
2037 | == NULL) { | |
2038 | al = SSL_AD_DECODE_ERROR; | |
2039 | goto f_err; | |
0f113f3e | 2040 | } |
e27f234a MC |
2041 | kn = EVP_PKEY_size(pkey); |
2042 | } else { | |
2043 | pkey = NULL; | |
2044 | kn = 0; | |
2045 | } | |
0f113f3e | 2046 | |
e27f234a MC |
2047 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
2048 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
2049 | goto err; | |
2050 | } | |
2051 | d = p = ssl_handshake_start(s); | |
0f113f3e | 2052 | |
85269210 | 2053 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
2054 | if (type & SSL_PSK) { |
2055 | /* copy PSK identity hint */ | |
2056 | if (s->cert->psk_identity_hint) { | |
2057 | s2n(strlen(s->cert->psk_identity_hint), p); | |
2058 | strncpy((char *)p, s->cert->psk_identity_hint, | |
2059 | strlen(s->cert->psk_identity_hint)); | |
2060 | p += strlen(s->cert->psk_identity_hint); | |
2061 | } else { | |
2062 | s2n(0, p); | |
85269210 | 2063 | } |
e27f234a | 2064 | } |
85269210 DSH |
2065 | #endif |
2066 | ||
e27f234a | 2067 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 2068 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
2069 | if ((i == 2) && (type & SSL_kSRP)) { |
2070 | *p = nr[i]; | |
2071 | p++; | |
2072 | } else | |
edc032b5 | 2073 | #endif |
e27f234a MC |
2074 | s2n(nr[i], p); |
2075 | BN_bn2bin(r[i], p); | |
2076 | p += nr[i]; | |
2077 | } | |
d02b48c6 | 2078 | |
10bf4fc2 | 2079 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
2080 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2081 | /* | |
2082 | * XXX: For now, we only support named (not generic) curves. In | |
2083 | * this situation, the serverKeyExchange message has: [1 byte | |
2084 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
2085 | * point], followed by the actual encoded point itself | |
2086 | */ | |
2087 | *p = NAMED_CURVE_TYPE; | |
2088 | p += 1; | |
2089 | *p = 0; | |
2090 | p += 1; | |
2091 | *p = curve_id; | |
2092 | p += 1; | |
2093 | *p = encodedlen; | |
2094 | p += 1; | |
2095 | memcpy(p, encodedPoint, encodedlen); | |
2096 | OPENSSL_free(encodedPoint); | |
2097 | encodedPoint = NULL; | |
2098 | p += encodedlen; | |
2099 | } | |
ea262260 BM |
2100 | #endif |
2101 | ||
e27f234a MC |
2102 | /* not anonymous */ |
2103 | if (pkey != NULL) { | |
2104 | /* | |
2105 | * n is the length of the params, they start at &(d[4]) and p | |
2106 | * points to the space at the end. | |
2107 | */ | |
bc36ee62 | 2108 | #ifndef OPENSSL_NO_RSA |
e27f234a MC |
2109 | if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { |
2110 | q = md_buf; | |
2111 | j = 0; | |
2112 | for (num = 2; num > 0; num--) { | |
2113 | EVP_MD_CTX_set_flags(&md_ctx, | |
2114 | EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); | |
2115 | EVP_DigestInit_ex(&md_ctx, (num == 2) | |
2116 | ? s->ctx->md5 : s->ctx->sha1, NULL); | |
2117 | EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), | |
2118 | SSL3_RANDOM_SIZE); | |
2119 | EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), | |
2120 | SSL3_RANDOM_SIZE); | |
2121 | EVP_DigestUpdate(&md_ctx, d, n); | |
2122 | EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); | |
2123 | q += i; | |
2124 | j += i; | |
2125 | } | |
2126 | if (RSA_sign(NID_md5_sha1, md_buf, j, | |
2127 | &(p[2]), &u, pkey->pkey.rsa) <= 0) { | |
2128 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_RSA); | |
2129 | goto err; | |
2130 | } | |
2131 | s2n(u, p); | |
2132 | n += u + 2; | |
2133 | } else | |
d02b48c6 | 2134 | #endif |
e27f234a MC |
2135 | if (md) { |
2136 | /* send signature algorithm */ | |
2137 | if (SSL_USE_SIGALGS(s)) { | |
2138 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
2139 | /* Should never happen */ | |
2140 | al = SSL_AD_INTERNAL_ERROR; | |
2141 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2142 | ERR_R_INTERNAL_ERROR); | |
2143 | goto f_err; | |
0f113f3e | 2144 | } |
e27f234a MC |
2145 | p += 2; |
2146 | } | |
a2f9200f | 2147 | #ifdef SSL_DEBUG |
e27f234a | 2148 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 2149 | #endif |
e27f234a MC |
2150 | EVP_SignInit_ex(&md_ctx, md, NULL); |
2151 | EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), | |
2152 | SSL3_RANDOM_SIZE); | |
2153 | EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), | |
2154 | SSL3_RANDOM_SIZE); | |
2155 | EVP_SignUpdate(&md_ctx, d, n); | |
2156 | if (!EVP_SignFinal(&md_ctx, &(p[2]), | |
2157 | (unsigned int *)&i, pkey)) { | |
2158 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); | |
2159 | goto err; | |
0f113f3e | 2160 | } |
e27f234a MC |
2161 | s2n(i, p); |
2162 | n += i + 2; | |
2163 | if (SSL_USE_SIGALGS(s)) | |
2164 | n += 2; | |
2165 | } else { | |
2166 | /* Is this error check actually needed? */ | |
77d514c5 | 2167 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
2168 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2169 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
2170 | goto f_err; |
2171 | } | |
0f113f3e MC |
2172 | } |
2173 | ||
e27f234a MC |
2174 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
2175 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2176 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2177 | goto f_err; | |
2178 | } | |
2179 | ||
0f113f3e | 2180 | EVP_MD_CTX_cleanup(&md_ctx); |
e27f234a | 2181 | return 1; |
0f113f3e MC |
2182 | f_err: |
2183 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2184 | err: | |
556efe79 | 2185 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 2186 | OPENSSL_free(encodedPoint); |
0f113f3e | 2187 | BN_CTX_free(bn_ctx); |
ea262260 | 2188 | #endif |
0f113f3e | 2189 | EVP_MD_CTX_cleanup(&md_ctx); |
fe3a3291 | 2190 | ossl_statem_set_error(s); |
e27f234a | 2191 | return 0; |
0f113f3e | 2192 | } |
d02b48c6 | 2193 | |
e27f234a | 2194 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
2195 | { |
2196 | unsigned char *p, *d; | |
2197 | int i, j, nl, off, n; | |
2198 | STACK_OF(X509_NAME) *sk = NULL; | |
2199 | X509_NAME *name; | |
2200 | BUF_MEM *buf; | |
2201 | ||
e27f234a | 2202 | buf = s->init_buf; |
0f113f3e | 2203 | |
e27f234a | 2204 | d = p = ssl_handshake_start(s); |
0f113f3e | 2205 | |
e27f234a MC |
2206 | /* get the list of acceptable cert types */ |
2207 | p++; | |
2208 | n = ssl3_get_req_cert_type(s, p); | |
2209 | d[0] = n; | |
2210 | p += n; | |
2211 | n++; | |
0f113f3e | 2212 | |
e27f234a MC |
2213 | if (SSL_USE_SIGALGS(s)) { |
2214 | const unsigned char *psigs; | |
2215 | unsigned char *etmp = p; | |
2216 | nl = tls12_get_psigalgs(s, &psigs); | |
2217 | /* Skip over length for now */ | |
0f113f3e | 2218 | p += 2; |
e27f234a MC |
2219 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
2220 | /* Now fill in length */ | |
2221 | s2n(nl, etmp); | |
2222 | p += nl; | |
2223 | n += nl + 2; | |
2224 | } | |
0f113f3e | 2225 | |
e27f234a MC |
2226 | off = n; |
2227 | p += 2; | |
2228 | n += 2; | |
2229 | ||
2230 | sk = SSL_get_client_CA_list(s); | |
2231 | nl = 0; | |
2232 | if (sk != NULL) { | |
2233 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
2234 | name = sk_X509_NAME_value(sk, i); | |
2235 | j = i2d_X509_NAME(name, NULL); | |
2236 | if (!BUF_MEM_grow_clean | |
2237 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
2238 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2239 | ERR_R_BUF_LIB); | |
2240 | goto err; | |
0f113f3e | 2241 | } |
e27f234a MC |
2242 | p = ssl_handshake_start(s) + n; |
2243 | s2n(j, p); | |
2244 | i2d_X509_NAME(name, &p); | |
2245 | n += 2 + j; | |
2246 | nl += 2 + j; | |
0f113f3e | 2247 | } |
e27f234a MC |
2248 | } |
2249 | /* else no CA names */ | |
2250 | p = ssl_handshake_start(s) + off; | |
2251 | s2n(nl, p); | |
d02b48c6 | 2252 | |
e27f234a MC |
2253 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2254 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2255 | goto err; | |
0f113f3e | 2256 | } |
d02b48c6 | 2257 | |
e27f234a MC |
2258 | s->s3->tmp.cert_request = 1; |
2259 | ||
2260 | return 1; | |
0f113f3e | 2261 | err: |
fe3a3291 | 2262 | ossl_statem_set_error(s); |
e27f234a | 2263 | return 0; |
0f113f3e | 2264 | } |
d02b48c6 | 2265 | |
73999b62 | 2266 | enum MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
e27f234a MC |
2267 | { |
2268 | int al; | |
2269 | unsigned int i; | |
0f113f3e | 2270 | unsigned long alg_k; |
bc36ee62 | 2271 | #ifndef OPENSSL_NO_RSA |
0f113f3e MC |
2272 | RSA *rsa = NULL; |
2273 | EVP_PKEY *pkey = NULL; | |
79df9d62 | 2274 | #endif |
bc36ee62 | 2275 | #ifndef OPENSSL_NO_DH |
0f113f3e MC |
2276 | BIGNUM *pub = NULL; |
2277 | DH *dh_srvr, *dh_clnt = NULL; | |
58964a49 | 2278 | #endif |
556efe79 | 2279 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2280 | EC_KEY *srvr_ecdh = NULL; |
2281 | EVP_PKEY *clnt_pub_pkey = NULL; | |
2282 | EC_POINT *clnt_ecpoint = NULL; | |
2283 | BN_CTX *bn_ctx = NULL; | |
ea262260 | 2284 | #endif |
73999b62 | 2285 | PACKET enc_premaster; |
20ca916d | 2286 | unsigned char *data, *rsa_decrypt = NULL; |
ea262260 | 2287 | |
0f113f3e | 2288 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; |
d02b48c6 | 2289 | |
85269210 DSH |
2290 | #ifndef OPENSSL_NO_PSK |
2291 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2292 | if (alg_k & SSL_PSK) { | |
2293 | unsigned char psk[PSK_MAX_PSK_LEN]; | |
2294 | size_t psklen; | |
73999b62 | 2295 | PACKET psk_identity; |
efcdbcbe | 2296 | |
73999b62 | 2297 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
85269210 | 2298 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2299 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2300 | goto f_err; |
2301 | } | |
6d41fc80 | 2302 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { |
85269210 | 2303 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2304 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2305 | SSL_R_DATA_LENGTH_TOO_LONG); |
2306 | goto f_err; | |
2307 | } | |
2308 | if (s->psk_server_callback == NULL) { | |
2309 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2310 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2311 | SSL_R_PSK_NO_SERVER_CB); |
2312 | goto f_err; | |
2313 | } | |
2314 | ||
6d41fc80 | 2315 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
cdde7b49 | 2316 | SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 | 2317 | al = SSL_AD_INTERNAL_ERROR; |
efcdbcbe MC |
2318 | goto f_err; |
2319 | } | |
85269210 DSH |
2320 | |
2321 | psklen = s->psk_server_callback(s, s->session->psk_identity, | |
2322 | psk, sizeof(psk)); | |
2323 | ||
2324 | if (psklen > PSK_MAX_PSK_LEN) { | |
2325 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2326 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2327 | goto f_err; |
2328 | } else if (psklen == 0) { | |
2329 | /* | |
2330 | * PSK related to the given identity not found | |
2331 | */ | |
e27f234a | 2332 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
85269210 DSH |
2333 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2334 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2335 | goto f_err; | |
2336 | } | |
2337 | ||
2338 | OPENSSL_free(s->s3->tmp.psk); | |
2339 | s->s3->tmp.psk = BUF_memdup(psk, psklen); | |
2340 | OPENSSL_cleanse(psk, psklen); | |
2341 | ||
2342 | if (s->s3->tmp.psk == NULL) { | |
2343 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2344 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
85269210 DSH |
2345 | goto f_err; |
2346 | } | |
2347 | ||
2348 | s->s3->tmp.psklen = psklen; | |
85269210 DSH |
2349 | } |
2350 | if (alg_k & SSL_kPSK) { | |
2351 | /* Identity extracted earlier: should be nothing left */ | |
73999b62 | 2352 | if (PACKET_remaining(pkt) != 0) { |
85269210 | 2353 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2354 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
85269210 DSH |
2355 | goto f_err; |
2356 | } | |
2357 | /* PSK handled by ssl_generate_master_secret */ | |
2358 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
2359 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2360 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
85269210 DSH |
2361 | goto f_err; |
2362 | } | |
2363 | } else | |
2364 | #endif | |
bc36ee62 | 2365 | #ifndef OPENSSL_NO_RSA |
85269210 | 2366 | if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
0f113f3e MC |
2367 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2368 | int decrypt_len; | |
2369 | unsigned char decrypt_good, version_good; | |
2370 | size_t j; | |
2371 | ||
2372 | /* FIX THIS UP EAY EAY EAY EAY */ | |
2373 | if (s->s3->tmp.use_rsa_tmp) { | |
2374 | if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL)) | |
2375 | rsa = s->cert->rsa_tmp; | |
2376 | /* | |
2377 | * Don't do a callback because rsa_tmp should be sent already | |
2378 | */ | |
2379 | if (rsa == NULL) { | |
2380 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2381 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2382 | SSL_R_MISSING_TMP_RSA_PKEY); |
2383 | goto f_err; | |
2384 | ||
2385 | } | |
2386 | } else { | |
2387 | pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; | |
2388 | if ((pkey == NULL) || | |
2389 | (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { | |
2390 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2391 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2392 | SSL_R_MISSING_RSA_CERTIFICATE); |
2393 | goto f_err; | |
2394 | } | |
2395 | rsa = pkey->pkey.rsa; | |
2396 | } | |
2397 | ||
20ca916d EK |
2398 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ |
2399 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
73999b62 | 2400 | enc_premaster = *pkt; |
20ca916d | 2401 | } else { |
73999b62 MC |
2402 | PACKET orig = *pkt; |
2403 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) | |
2404 | || PACKET_remaining(pkt) != 0) { | |
20ca916d EK |
2405 | /* Try SSLv3 behaviour for TLS. */ |
2406 | if (s->options & SSL_OP_TLS_D5_BUG) { | |
2407 | enc_premaster = orig; | |
2408 | } else { | |
0f113f3e | 2409 | al = SSL_AD_DECODE_ERROR; |
20ca916d | 2410 | SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); |
0f113f3e | 2411 | goto f_err; |
efcdbcbe MC |
2412 | } |
2413 | } | |
0f113f3e MC |
2414 | } |
2415 | ||
2416 | /* | |
20ca916d EK |
2417 | * We want to be sure that the plaintext buffer size makes it safe to |
2418 | * iterate over the entire size of a premaster secret | |
2419 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2420 | * their ciphertext cannot accommodate a premaster secret anyway. | |
0f113f3e | 2421 | */ |
20ca916d EK |
2422 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { |
2423 | al = SSL_AD_INTERNAL_ERROR; | |
0f113f3e | 2424 | SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, |
20ca916d | 2425 | RSA_R_KEY_SIZE_TOO_SMALL); |
0f113f3e MC |
2426 | goto f_err; |
2427 | } | |
2428 | ||
20ca916d EK |
2429 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2430 | if (rsa_decrypt == NULL) { | |
efcdbcbe | 2431 | al = SSL_AD_INTERNAL_ERROR; |
20ca916d | 2432 | SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2433 | goto f_err; |
2434 | } | |
20ca916d | 2435 | |
0f113f3e MC |
2436 | /* |
2437 | * We must not leak whether a decryption failure occurs because of | |
2438 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2439 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2440 | * generates a random premaster secret for the case that the decrypt | |
2441 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2442 | */ | |
2443 | ||
266483d2 | 2444 | if (RAND_bytes(rand_premaster_secret, |
20ca916d | 2445 | sizeof(rand_premaster_secret)) <= 0) { |
0f113f3e | 2446 | goto err; |
20ca916d EK |
2447 | } |
2448 | ||
2449 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2450 | PACKET_data(&enc_premaster), | |
2451 | rsa_decrypt, rsa, RSA_PKCS1_PADDING); | |
0f113f3e MC |
2452 | ERR_clear_error(); |
2453 | ||
2454 | /* | |
2455 | * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will | |
2456 | * be 0xff if so and zero otherwise. | |
2457 | */ | |
2458 | decrypt_good = | |
2459 | constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); | |
2460 | ||
2461 | /* | |
2462 | * If the version in the decrypted pre-master secret is correct then | |
2463 | * version_good will be 0xff, otherwise it'll be zero. The | |
2464 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2465 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2466 | * check as a "bad version oracle". Thus version checks are done in | |
2467 | * constant time and are treated like any other decryption error. | |
2468 | */ | |
2469 | version_good = | |
20ca916d EK |
2470 | constant_time_eq_8(rsa_decrypt[0], |
2471 | (unsigned)(s->client_version >> 8)); | |
0f113f3e | 2472 | version_good &= |
20ca916d EK |
2473 | constant_time_eq_8(rsa_decrypt[1], |
2474 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e MC |
2475 | |
2476 | /* | |
2477 | * The premaster secret must contain the same version number as the | |
2478 | * ClientHello to detect version rollback attacks (strangely, the | |
2479 | * protocol does not offer such protection for DH ciphersuites). | |
2480 | * However, buggy clients exist that send the negotiated protocol | |
2481 | * version instead if the server does not support the requested | |
2482 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2483 | * clients. | |
2484 | */ | |
2485 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2486 | unsigned char workaround_good; | |
2487 | workaround_good = | |
20ca916d | 2488 | constant_time_eq_8(rsa_decrypt[0], (unsigned)(s->version >> 8)); |
0f113f3e | 2489 | workaround_good &= |
20ca916d EK |
2490 | constant_time_eq_8(rsa_decrypt[1], |
2491 | (unsigned)(s->version & 0xff)); | |
0f113f3e MC |
2492 | version_good |= workaround_good; |
2493 | } | |
2494 | ||
2495 | /* | |
2496 | * Both decryption and version must be good for decrypt_good to | |
2497 | * remain non-zero (0xff). | |
2498 | */ | |
2499 | decrypt_good &= version_good; | |
2500 | ||
2501 | /* | |
2502 | * Now copy rand_premaster_secret over from p using | |
2503 | * decrypt_good_mask. If decryption failed, then p does not | |
2504 | * contain valid plaintext, however, a check above guarantees | |
2505 | * it is still sufficiently large to read from. | |
2506 | */ | |
2507 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
20ca916d EK |
2508 | rsa_decrypt[j] = |
2509 | constant_time_select_8(decrypt_good, rsa_decrypt[j], | |
2510 | rand_premaster_secret[j]); | |
0f113f3e MC |
2511 | } |
2512 | ||
20ca916d EK |
2513 | if (!ssl_generate_master_secret(s, rsa_decrypt, |
2514 | sizeof(rand_premaster_secret), 0)) { | |
69f68237 | 2515 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2516 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2517 | goto f_err; |
2518 | } | |
20ca916d EK |
2519 | OPENSSL_free(rsa_decrypt); |
2520 | rsa_decrypt = NULL; | |
0f113f3e | 2521 | } else |
4c5fac4a | 2522 | #endif |
bc36ee62 | 2523 | #ifndef OPENSSL_NO_DH |
85269210 | 2524 | if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) { |
0f113f3e MC |
2525 | int idx = -1; |
2526 | EVP_PKEY *skey = NULL; | |
73999b62 | 2527 | PACKET bookmark = *pkt; |
efcdbcbe MC |
2528 | unsigned char shared[(OPENSSL_DH_MAX_MODULUS_BITS + 7) / 8]; |
2529 | ||
73999b62 | 2530 | if (!PACKET_get_net_2(pkt, &i)) { |
85269210 | 2531 | if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
d3cc5e61 | 2532 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2533 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
d3cc5e61 MC |
2534 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2535 | goto f_err; | |
2536 | } | |
0f113f3e | 2537 | i = 0; |
d3cc5e61 | 2538 | } |
73999b62 | 2539 | if (PACKET_remaining(pkt) != i) { |
0f113f3e | 2540 | if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) { |
e27f234a | 2541 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2542 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2543 | goto err; | |
2544 | } else { | |
73999b62 MC |
2545 | *pkt = bookmark; |
2546 | i = PACKET_remaining(pkt); | |
0f113f3e MC |
2547 | } |
2548 | } | |
2549 | if (alg_k & SSL_kDHr) | |
2550 | idx = SSL_PKEY_DH_RSA; | |
2551 | else if (alg_k & SSL_kDHd) | |
2552 | idx = SSL_PKEY_DH_DSA; | |
2553 | if (idx >= 0) { | |
2554 | skey = s->cert->pkeys[idx].privatekey; | |
2555 | if ((skey == NULL) || | |
2556 | (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) { | |
2557 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2558 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2559 | SSL_R_MISSING_RSA_CERTIFICATE); |
2560 | goto f_err; | |
2561 | } | |
2562 | dh_srvr = skey->pkey.dh; | |
2563 | } else if (s->s3->tmp.dh == NULL) { | |
2564 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2565 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2566 | SSL_R_MISSING_TMP_DH_KEY); |
2567 | goto f_err; | |
2568 | } else | |
2569 | dh_srvr = s->s3->tmp.dh; | |
2570 | ||
73999b62 | 2571 | if (PACKET_remaining(pkt) == 0L) { |
0f113f3e MC |
2572 | /* Get pubkey from cert */ |
2573 | EVP_PKEY *clkey = X509_get_pubkey(s->session->peer); | |
2574 | if (clkey) { | |
2575 | if (EVP_PKEY_cmp_parameters(clkey, skey) == 1) | |
2576 | dh_clnt = EVP_PKEY_get1_DH(clkey); | |
2577 | } | |
2578 | if (dh_clnt == NULL) { | |
2579 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2580 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2581 | SSL_R_MISSING_TMP_DH_KEY); |
2582 | goto f_err; | |
2583 | } | |
2584 | EVP_PKEY_free(clkey); | |
2585 | pub = dh_clnt->pub_key; | |
efcdbcbe | 2586 | } else { |
73999b62 | 2587 | if (!PACKET_get_bytes(pkt, &data, i)) { |
efcdbcbe MC |
2588 | /* We already checked we have enough data */ |
2589 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 2590 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2591 | ERR_R_INTERNAL_ERROR); |
2592 | goto f_err; | |
2593 | } | |
2594 | pub = BN_bin2bn(data, i, NULL); | |
2595 | } | |
0f113f3e | 2596 | if (pub == NULL) { |
e27f234a | 2597 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); |
0f113f3e MC |
2598 | goto err; |
2599 | } | |
2600 | ||
efcdbcbe | 2601 | i = DH_compute_key(shared, pub, dh_srvr); |
0f113f3e MC |
2602 | |
2603 | if (i <= 0) { | |
e27f234a | 2604 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); |
0f113f3e MC |
2605 | BN_clear_free(pub); |
2606 | goto err; | |
2607 | } | |
2608 | ||
2609 | DH_free(s->s3->tmp.dh); | |
2610 | s->s3->tmp.dh = NULL; | |
2611 | if (dh_clnt) | |
2612 | DH_free(dh_clnt); | |
2613 | else | |
2614 | BN_clear_free(pub); | |
2615 | pub = NULL; | |
efcdbcbe | 2616 | if (!ssl_generate_master_secret(s, shared, i, 0)) { |
69f68237 | 2617 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2618 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2619 | goto f_err; |
2620 | } | |
e27f234a | 2621 | if (dh_clnt) { |
a71a4966 | 2622 | s->statem.no_cert_verify = 1; |
e27f234a MC |
2623 | return MSG_PROCESS_CONTINUE_PROCESSING; |
2624 | } | |
0f113f3e | 2625 | } else |
d02b48c6 | 2626 | #endif |
ea262260 | 2627 | |
556efe79 | 2628 | #ifndef OPENSSL_NO_EC |
85269210 | 2629 | if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) { |
0f113f3e MC |
2630 | int field_size = 0; |
2631 | const EC_KEY *tkey; | |
2632 | const EC_GROUP *group; | |
2633 | const BIGNUM *priv_key; | |
efcdbcbe | 2634 | unsigned char *shared; |
0f113f3e MC |
2635 | |
2636 | /* initialize structures for server's ECDH key pair */ | |
2637 | if ((srvr_ecdh = EC_KEY_new()) == NULL) { | |
e27f234a | 2638 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2639 | goto err; |
2640 | } | |
2641 | ||
2642 | /* Let's get server private key and group information */ | |
2643 | if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { | |
2644 | /* use the certificate */ | |
2645 | tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec; | |
2646 | } else { | |
2647 | /* | |
2648 | * use the ephermeral values we saved when generating the | |
2649 | * ServerKeyExchange msg. | |
2650 | */ | |
2651 | tkey = s->s3->tmp.ecdh; | |
2652 | } | |
2653 | ||
2654 | group = EC_KEY_get0_group(tkey); | |
2655 | priv_key = EC_KEY_get0_private_key(tkey); | |
2656 | ||
2657 | if (!EC_KEY_set_group(srvr_ecdh, group) || | |
2658 | !EC_KEY_set_private_key(srvr_ecdh, priv_key)) { | |
e27f234a | 2659 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2660 | goto err; |
2661 | } | |
2662 | ||
2663 | /* Let's get client's public key */ | |
2664 | if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) { | |
e27f234a | 2665 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2666 | goto err; |
2667 | } | |
2668 | ||
73999b62 | 2669 | if (PACKET_remaining(pkt) == 0L) { |
0f113f3e MC |
2670 | /* Client Publickey was in Client Certificate */ |
2671 | ||
85269210 | 2672 | if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
0f113f3e | 2673 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2674 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2675 | SSL_R_MISSING_TMP_ECDH_KEY); |
2676 | goto f_err; | |
2677 | } | |
2678 | if (((clnt_pub_pkey = X509_get_pubkey(s->session->peer)) | |
2679 | == NULL) || (clnt_pub_pkey->type != EVP_PKEY_EC)) { | |
2680 | /* | |
2681 | * XXX: For now, we do not support client authentication | |
2682 | * using ECDH certificates so this branch (n == 0L) of the | |
2683 | * code is never executed. When that support is added, we | |
2684 | * ought to ensure the key received in the certificate is | |
2685 | * authorized for key agreement. ECDH_compute_key implicitly | |
2686 | * checks that the two ECDH shares are for the same group. | |
2687 | */ | |
2688 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2689 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2690 | SSL_R_UNABLE_TO_DECODE_ECDH_CERTS); |
2691 | goto f_err; | |
2692 | } | |
2693 | ||
2694 | if (EC_POINT_copy(clnt_ecpoint, | |
2695 | EC_KEY_get0_public_key(clnt_pub_pkey-> | |
2696 | pkey.ec)) == 0) { | |
e27f234a | 2697 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2698 | goto err; |
2699 | } | |
a71a4966 | 2700 | s->statem.no_cert_verify = 1; |
0f113f3e MC |
2701 | } else { |
2702 | /* | |
2703 | * Get client's public key from encoded point in the | |
2704 | * ClientKeyExchange message. | |
2705 | */ | |
2706 | if ((bn_ctx = BN_CTX_new()) == NULL) { | |
e27f234a | 2707 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2708 | ERR_R_MALLOC_FAILURE); |
2709 | goto err; | |
2710 | } | |
2711 | ||
2712 | /* Get encoded point length */ | |
73999b62 | 2713 | if (!PACKET_get_1(pkt, &i)) { |
efcdbcbe | 2714 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2715 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
efcdbcbe MC |
2716 | SSL_R_LENGTH_MISMATCH); |
2717 | goto f_err; | |
2718 | } | |
73999b62 MC |
2719 | if (!PACKET_get_bytes(pkt, &data, i) |
2720 | || PACKET_remaining(pkt) != 0) { | |
e27f234a | 2721 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2722 | goto err; |
2723 | } | |
efcdbcbe | 2724 | if (EC_POINT_oct2point(group, clnt_ecpoint, data, i, bn_ctx) == 0) { |
e27f234a | 2725 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); |
0f113f3e MC |
2726 | goto err; |
2727 | } | |
0f113f3e MC |
2728 | } |
2729 | ||
2730 | /* Compute the shared pre-master secret */ | |
2731 | field_size = EC_GROUP_get_degree(group); | |
2732 | if (field_size <= 0) { | |
e27f234a | 2733 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
0f113f3e MC |
2734 | goto err; |
2735 | } | |
efcdbcbe MC |
2736 | shared = OPENSSL_malloc((field_size + 7) / 8); |
2737 | if (shared == NULL) { | |
e27f234a | 2738 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
efcdbcbe MC |
2739 | goto err; |
2740 | } | |
2741 | i = ECDH_compute_key(shared, (field_size + 7) / 8, clnt_ecpoint, | |
2742 | srvr_ecdh, NULL); | |
0f113f3e | 2743 | if (i <= 0) { |
e27f234a | 2744 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); |
efcdbcbe | 2745 | OPENSSL_free(shared); |
0f113f3e MC |
2746 | goto err; |
2747 | } | |
2748 | ||
2749 | EVP_PKEY_free(clnt_pub_pkey); | |
2750 | EC_POINT_free(clnt_ecpoint); | |
2751 | EC_KEY_free(srvr_ecdh); | |
2752 | BN_CTX_free(bn_ctx); | |
2753 | EC_KEY_free(s->s3->tmp.ecdh); | |
2754 | s->s3->tmp.ecdh = NULL; | |
2755 | ||
efcdbcbe | 2756 | if (!ssl_generate_master_secret(s, shared, i, 1)) { |
69f68237 | 2757 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2758 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2759 | goto f_err; |
2760 | } | |
e27f234a | 2761 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2762 | } else |
ddac1974 | 2763 | #endif |
edc032b5 | 2764 | #ifndef OPENSSL_NO_SRP |
0f113f3e | 2765 | if (alg_k & SSL_kSRP) { |
73999b62 MC |
2766 | if (!PACKET_get_net_2(pkt, &i) |
2767 | || !PACKET_get_bytes(pkt, &data, i)) { | |
0f113f3e | 2768 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2769 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); |
0f113f3e MC |
2770 | goto f_err; |
2771 | } | |
efcdbcbe | 2772 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { |
e27f234a | 2773 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); |
0f113f3e MC |
2774 | goto err; |
2775 | } | |
2776 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2777 | || BN_is_zero(s->srp_ctx.A)) { | |
2778 | al = SSL_AD_ILLEGAL_PARAMETER; | |
e27f234a | 2779 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2780 | SSL_R_BAD_SRP_PARAMETERS); |
2781 | goto f_err; | |
2782 | } | |
b548a1f1 | 2783 | OPENSSL_free(s->session->srp_username); |
0f113f3e MC |
2784 | s->session->srp_username = BUF_strdup(s->srp_ctx.login); |
2785 | if (s->session->srp_username == NULL) { | |
e27f234a | 2786 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2787 | goto err; |
2788 | } | |
2789 | ||
57b272b0 | 2790 | if (!srp_generate_server_master_secret(s)) { |
e27f234a | 2791 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
2792 | goto err; |
2793 | } | |
0f113f3e MC |
2794 | } else |
2795 | #endif /* OPENSSL_NO_SRP */ | |
2796 | if (alg_k & SSL_kGOST) { | |
0f113f3e MC |
2797 | EVP_PKEY_CTX *pkey_ctx; |
2798 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2799 | unsigned char premaster_secret[32], *start; | |
2800 | size_t outlen = 32, inlen; | |
2801 | unsigned long alg_a; | |
2802 | int Ttag, Tclass; | |
2803 | long Tlen; | |
73999b62 | 2804 | long sess_key_len; |
0f113f3e MC |
2805 | |
2806 | /* Get our certificate private key */ | |
2807 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
ade44dcb | 2808 | if (alg_a & SSL_aGOST01) |
0f113f3e MC |
2809 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; |
2810 | ||
2811 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
2812 | EVP_PKEY_decrypt_init(pkey_ctx); | |
2813 | /* | |
2814 | * If client certificate is present and is of the same type, maybe | |
2815 | * use it for key exchange. Don't mind errors from | |
2816 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2817 | * client certificate for authorization only. | |
2818 | */ | |
2819 | client_pub_pkey = X509_get_pubkey(s->session->peer); | |
2820 | if (client_pub_pkey) { | |
2821 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2822 | ERR_clear_error(); | |
2823 | } | |
2824 | /* Decrypt session key */ | |
73999b62 MC |
2825 | sess_key_len = PACKET_remaining(pkt); |
2826 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
efcdbcbe | 2827 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2828 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
efcdbcbe MC |
2829 | goto f_err; |
2830 | } | |
73999b62 MC |
2831 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, |
2832 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2833 | || Ttag != V_ASN1_SEQUENCE | |
0f113f3e | 2834 | || Tclass != V_ASN1_UNIVERSAL) { |
e27f234a | 2835 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2836 | SSL_R_DECRYPTION_FAILED); |
2837 | goto gerr; | |
2838 | } | |
efcdbcbe | 2839 | start = data; |
0f113f3e MC |
2840 | inlen = Tlen; |
2841 | if (EVP_PKEY_decrypt | |
2842 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
e27f234a | 2843 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0f113f3e MC |
2844 | SSL_R_DECRYPTION_FAILED); |
2845 | goto gerr; | |
2846 | } | |
2847 | /* Generate master secret */ | |
57b272b0 DSH |
2848 | if (!ssl_generate_master_secret(s, premaster_secret, |
2849 | sizeof(premaster_secret), 0)) { | |
69f68237 | 2850 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2851 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
69f68237 MC |
2852 | goto f_err; |
2853 | } | |
0f113f3e MC |
2854 | /* Check if pubkey from client certificate was used */ |
2855 | if (EVP_PKEY_CTX_ctrl | |
2856 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
a71a4966 | 2857 | s->statem.no_cert_verify = 1; |
e27f234a MC |
2858 | |
2859 | EVP_PKEY_free(client_pub_pkey); | |
2860 | EVP_PKEY_CTX_free(pkey_ctx); | |
2861 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
0f113f3e MC |
2862 | gerr: |
2863 | EVP_PKEY_free(client_pub_pkey); | |
2864 | EVP_PKEY_CTX_free(pkey_ctx); | |
c5ba2d99 | 2865 | goto err; |
0f113f3e MC |
2866 | } else { |
2867 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2868 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
0f113f3e MC |
2869 | goto f_err; |
2870 | } | |
2871 | ||
e27f234a | 2872 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2873 | f_err: |
2874 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
556efe79 | 2875 | #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP) |
0f113f3e | 2876 | err: |
ea262260 | 2877 | #endif |
556efe79 | 2878 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
2879 | EVP_PKEY_free(clnt_pub_pkey); |
2880 | EC_POINT_free(clnt_ecpoint); | |
8fdc3734 | 2881 | EC_KEY_free(srvr_ecdh); |
0f113f3e | 2882 | BN_CTX_free(bn_ctx); |
20ca916d | 2883 | OPENSSL_free(rsa_decrypt); |
85269210 DSH |
2884 | #endif |
2885 | #ifndef OPENSSL_NO_PSK | |
2886 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2887 | s->s3->tmp.psk = NULL; | |
58964a49 | 2888 | #endif |
fe3a3291 | 2889 | ossl_statem_set_error(s); |
e27f234a | 2890 | return MSG_PROCESS_ERROR; |
0f113f3e | 2891 | } |
d02b48c6 | 2892 | |
94836de2 MC |
2893 | enum WORK_STATE tls_post_process_client_key_exchange(SSL *s, |
2894 | enum WORK_STATE wst) | |
2895 | { | |
94836de2 | 2896 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2897 | if (wst == WORK_MORE_A) { |
2898 | if (SSL_IS_DTLS(s)) { | |
2899 | unsigned char sctpauthkey[64]; | |
2900 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2901 | /* | |
2902 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2903 | * used. | |
2904 | */ | |
2905 | snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), | |
2906 | DTLS1_SCTP_AUTH_LABEL); | |
2907 | ||
2908 | if (SSL_export_keying_material(s, sctpauthkey, | |
2909 | sizeof(sctpauthkey), labelbuffer, | |
2910 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2911 | ossl_statem_set_error(s); |
c130dd8e MC |
2912 | return WORK_ERROR;; |
2913 | } | |
94836de2 | 2914 | |
c130dd8e MC |
2915 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2916 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2917 | } |
c130dd8e MC |
2918 | wst = WORK_MORE_B; |
2919 | } | |
94836de2 | 2920 | |
c130dd8e MC |
2921 | if ((wst == WORK_MORE_B) |
2922 | /* Is this SCTP? */ | |
2923 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2924 | /* Are we renegotiating? */ | |
2925 | && s->renegotiate | |
2926 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2927 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2928 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2929 | s->s3->in_read_app_data = 2; | |
2930 | s->rwstate = SSL_READING; | |
2931 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2932 | BIO_set_retry_read(SSL_get_rbio(s)); | |
2933 | statem_set_sctp_read_sock(s, 1); | |
2934 | return WORK_MORE_B; | |
2935 | } else { | |
fe3a3291 | 2936 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2937 | } |
2938 | #endif | |
2939 | ||
a71a4966 | 2940 | if (s->statem.no_cert_verify) { |
94836de2 MC |
2941 | /* No certificate verify so we no longer need the handshake_buffer */ |
2942 | BIO_free(s->s3->handshake_buffer); | |
2943 | return WORK_FINISHED_CONTINUE; | |
2944 | } else if (SSL_USE_SIGALGS(s)) { | |
2945 | if (!s->session->peer) { | |
2946 | /* No peer certificate so we no longer need the handshake_buffer */ | |
2947 | BIO_free(s->s3->handshake_buffer); | |
2948 | return WORK_FINISHED_CONTINUE; | |
2949 | } | |
2950 | if (!s->s3->handshake_buffer) { | |
2951 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2952 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2953 | ossl_statem_set_error(s); |
94836de2 MC |
2954 | return WORK_ERROR; |
2955 | } | |
2956 | /* | |
2957 | * For sigalgs freeze the handshake buffer. If we support | |
2958 | * extms we've done this already so this is a no-op | |
2959 | */ | |
2960 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2961 | ossl_statem_set_error(s); |
94836de2 MC |
2962 | return WORK_ERROR; |
2963 | } | |
2964 | } else { | |
2965 | int offset = 0; | |
2966 | int dgst_num; | |
2967 | ||
2968 | /* | |
2969 | * We need to get hashes here so if there is a client cert, | |
2970 | * it can be verified FIXME - digest processing for | |
2971 | * CertificateVerify should be generalized. But it is next | |
2972 | * step | |
2973 | */ | |
2974 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 2975 | ossl_statem_set_error(s); |
94836de2 MC |
2976 | return WORK_ERROR; |
2977 | } | |
2978 | for (dgst_num = 0; dgst_num < SSL_MAX_DIGEST; dgst_num++) { | |
2979 | if (s->s3->handshake_dgst[dgst_num]) { | |
2980 | int dgst_size; | |
2981 | ||
2982 | s->method->ssl3_enc->cert_verify_mac(s, | |
2983 | EVP_MD_CTX_type | |
2984 | (s-> | |
2985 | s3->handshake_dgst | |
2986 | [dgst_num]), | |
2987 | &(s->s3-> | |
2988 | tmp.cert_verify_md | |
2989 | [offset])); | |
2990 | dgst_size = | |
2991 | EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]); | |
2992 | if (dgst_size < 0) { | |
fe3a3291 | 2993 | ossl_statem_set_error(s); |
94836de2 MC |
2994 | return WORK_ERROR; |
2995 | } | |
2996 | offset += dgst_size; | |
2997 | } | |
2998 | } | |
2999 | } | |
3000 | ||
3001 | return WORK_FINISHED_CONTINUE; | |
3002 | } | |
3003 | ||
73999b62 | 3004 | enum MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
3005 | { |
3006 | EVP_PKEY *pkey = NULL; | |
3007 | unsigned char *sig, *data; | |
3008 | int al, ret = MSG_PROCESS_ERROR; | |
3009 | int type = 0, i, j; | |
3010 | unsigned int len; | |
3011 | X509 *peer; | |
3012 | const EVP_MD *md = NULL; | |
3013 | EVP_MD_CTX mctx; | |
e27f234a MC |
3014 | EVP_MD_CTX_init(&mctx); |
3015 | ||
a0bd6493 MC |
3016 | peer = s->session->peer; |
3017 | pkey = X509_get_pubkey(peer); | |
3018 | type = X509_certificate_type(peer, pkey); | |
0f113f3e MC |
3019 | |
3020 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 3021 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
3022 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
3023 | al = SSL_AD_ILLEGAL_PARAMETER; | |
3024 | goto f_err; | |
3025 | } | |
3026 | ||
0f113f3e MC |
3027 | /* Check for broken implementations of GOST ciphersuites */ |
3028 | /* | |
3029 | * If key is GOST and n is exactly 64, it is bare signature without | |
3030 | * length field | |
3031 | */ | |
73999b62 | 3032 | if (PACKET_remaining(pkt) == 64 && pkey->type == NID_id_GostR3410_2001) { |
f532a35d | 3033 | len = 64; |
0f113f3e MC |
3034 | } else { |
3035 | if (SSL_USE_SIGALGS(s)) { | |
f532a35d MC |
3036 | int rv; |
3037 | ||
73999b62 | 3038 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
3039 | al = SSL_AD_DECODE_ERROR; |
3040 | goto f_err; | |
3041 | } | |
3042 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
3043 | if (rv == -1) { |
3044 | al = SSL_AD_INTERNAL_ERROR; | |
3045 | goto f_err; | |
3046 | } else if (rv == 0) { | |
3047 | al = SSL_AD_DECODE_ERROR; | |
3048 | goto f_err; | |
3049 | } | |
f37f20ff | 3050 | #ifdef SSL_DEBUG |
0f113f3e | 3051 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 3052 | #endif |
0f113f3e | 3053 | } |
73999b62 | 3054 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 3055 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
3056 | al = SSL_AD_DECODE_ERROR; |
3057 | goto f_err; | |
3058 | } | |
3059 | } | |
3060 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
3061 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
3062 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 3063 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
3064 | al = SSL_AD_DECODE_ERROR; |
3065 | goto f_err; | |
3066 | } | |
73999b62 | 3067 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 3068 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
3069 | al = SSL_AD_DECODE_ERROR; |
3070 | goto f_err; | |
3071 | } | |
0f113f3e MC |
3072 | |
3073 | if (SSL_USE_SIGALGS(s)) { | |
3074 | long hdatalen = 0; | |
3075 | void *hdata; | |
3076 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); | |
3077 | if (hdatalen <= 0) { | |
e27f234a | 3078 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
3079 | al = SSL_AD_INTERNAL_ERROR; |
3080 | goto f_err; | |
3081 | } | |
f37f20ff | 3082 | #ifdef SSL_DEBUG |
0f113f3e MC |
3083 | fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n", |
3084 | EVP_MD_name(md)); | |
f37f20ff | 3085 | #endif |
0f113f3e MC |
3086 | if (!EVP_VerifyInit_ex(&mctx, md, NULL) |
3087 | || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) { | |
e27f234a | 3088 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
0f113f3e MC |
3089 | al = SSL_AD_INTERNAL_ERROR; |
3090 | goto f_err; | |
3091 | } | |
3092 | ||
f532a35d | 3093 | if (EVP_VerifyFinal(&mctx, data, len, pkey) <= 0) { |
0f113f3e | 3094 | al = SSL_AD_DECRYPT_ERROR; |
e27f234a | 3095 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); |
0f113f3e MC |
3096 | goto f_err; |
3097 | } | |
3098 | } else | |
3099 | #ifndef OPENSSL_NO_RSA | |
3100 | if (pkey->type == EVP_PKEY_RSA) { | |
3101 | i = RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md, | |
f532a35d | 3102 | MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, data, len, |
0f113f3e MC |
3103 | pkey->pkey.rsa); |
3104 | if (i < 0) { | |
3105 | al = SSL_AD_DECRYPT_ERROR; | |
e27f234a | 3106 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_DECRYPT); |
0f113f3e MC |
3107 | goto f_err; |
3108 | } | |
3109 | if (i == 0) { | |
3110 | al = SSL_AD_DECRYPT_ERROR; | |
e27f234a | 3111 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_RSA_SIGNATURE); |
0f113f3e MC |
3112 | goto f_err; |
3113 | } | |
3114 | } else | |
d02b48c6 | 3115 | #endif |
bc36ee62 | 3116 | #ifndef OPENSSL_NO_DSA |
0f113f3e MC |
3117 | if (pkey->type == EVP_PKEY_DSA) { |
3118 | j = DSA_verify(pkey->save_type, | |
3119 | &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), | |
f532a35d | 3120 | SHA_DIGEST_LENGTH, data, len, pkey->pkey.dsa); |
0f113f3e MC |
3121 | if (j <= 0) { |
3122 | /* bad signature */ | |
3123 | al = SSL_AD_DECRYPT_ERROR; | |
e27f234a | 3124 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_DSA_SIGNATURE); |
0f113f3e MC |
3125 | goto f_err; |
3126 | } | |
3127 | } else | |
ea262260 | 3128 | #endif |
10bf4fc2 | 3129 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
3130 | if (pkey->type == EVP_PKEY_EC) { |
3131 | j = ECDSA_verify(pkey->save_type, | |
3132 | &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), | |
f532a35d | 3133 | SHA_DIGEST_LENGTH, data, len, pkey->pkey.ec); |
0f113f3e MC |
3134 | if (j <= 0) { |
3135 | /* bad signature */ | |
3136 | al = SSL_AD_DECRYPT_ERROR; | |
e27f234a | 3137 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE); |
0f113f3e MC |
3138 | goto f_err; |
3139 | } | |
3140 | } else | |
d02b48c6 | 3141 | #endif |
ade44dcb | 3142 | if (pkey->type == NID_id_GostR3410_2001) { |
0f113f3e MC |
3143 | unsigned char signature[64]; |
3144 | int idx; | |
3145 | EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey, NULL); | |
3146 | EVP_PKEY_verify_init(pctx); | |
f532a35d MC |
3147 | if (len != 64) { |
3148 | fprintf(stderr, "GOST signature length is %d", len); | |
0f113f3e MC |
3149 | } |
3150 | for (idx = 0; idx < 64; idx++) { | |
f532a35d | 3151 | signature[63 - idx] = data[idx]; |
0f113f3e MC |
3152 | } |
3153 | j = EVP_PKEY_verify(pctx, signature, 64, s->s3->tmp.cert_verify_md, | |
3154 | 32); | |
3155 | EVP_PKEY_CTX_free(pctx); | |
3156 | if (j <= 0) { | |
3157 | al = SSL_AD_DECRYPT_ERROR; | |
e27f234a | 3158 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE); |
0f113f3e MC |
3159 | goto f_err; |
3160 | } | |
3161 | } else { | |
e27f234a | 3162 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
3163 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; |
3164 | goto f_err; | |
3165 | } | |
3166 | ||
c130dd8e | 3167 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
3168 | if (0) { |
3169 | f_err: | |
3170 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 3171 | ossl_statem_set_error(s); |
0f113f3e | 3172 | } |
25aaa98a RS |
3173 | BIO_free(s->s3->handshake_buffer); |
3174 | s->s3->handshake_buffer = NULL; | |
0f113f3e MC |
3175 | EVP_MD_CTX_cleanup(&mctx); |
3176 | EVP_PKEY_free(pkey); | |
e27f234a | 3177 | return ret; |
0f113f3e | 3178 | } |
d02b48c6 | 3179 | |
73999b62 | 3180 | enum MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a MC |
3181 | { |
3182 | int i, al, ret = MSG_PROCESS_ERROR; | |
3183 | X509 *x = NULL; | |
3184 | unsigned long l, llen; | |
3185 | const unsigned char *certstart; | |
3186 | unsigned char *certbytes; | |
3187 | STACK_OF(X509) *sk = NULL; | |
73999b62 | 3188 | PACKET spkt; |
0f113f3e MC |
3189 | |
3190 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
3191 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3192 | goto f_err; | |
0f113f3e MC |
3193 | } |
3194 | ||
73999b62 MC |
3195 | if (!PACKET_get_net_3(pkt, &llen) |
3196 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
3197 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 3198 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3199 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
3200 | goto f_err; |
3201 | } | |
0bc09ecd MC |
3202 | |
3203 | while (PACKET_remaining(&spkt) > 0) { | |
3204 | if (!PACKET_get_net_3(&spkt, &l) | |
3205 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 3206 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3207 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3208 | SSL_R_CERT_LENGTH_MISMATCH); |
3209 | goto f_err; | |
3210 | } | |
3211 | ||
0bc09ecd MC |
3212 | certstart = certbytes; |
3213 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 3214 | if (x == NULL) { |
e27f234a MC |
3215 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
3216 | goto f_err; | |
0f113f3e | 3217 | } |
0bc09ecd | 3218 | if (certbytes != (certstart + l)) { |
0f113f3e | 3219 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3220 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3221 | SSL_R_CERT_LENGTH_MISMATCH); |
3222 | goto f_err; | |
3223 | } | |
3224 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
3225 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3226 | goto f_err; | |
0f113f3e MC |
3227 | } |
3228 | x = NULL; | |
0f113f3e MC |
3229 | } |
3230 | ||
3231 | if (sk_X509_num(sk) <= 0) { | |
3232 | /* TLS does not mind 0 certs returned */ | |
3233 | if (s->version == SSL3_VERSION) { | |
3234 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3235 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3236 | SSL_R_NO_CERTIFICATES_RETURNED); |
3237 | goto f_err; | |
3238 | } | |
3239 | /* Fail for TLS only if we required a certificate */ | |
3240 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
3241 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 3242 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3243 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
3244 | al = SSL_AD_HANDSHAKE_FAILURE; | |
3245 | goto f_err; | |
3246 | } | |
3247 | /* No client certificate so digest cached records */ | |
124037fd | 3248 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
3249 | al = SSL_AD_INTERNAL_ERROR; |
3250 | goto f_err; | |
3251 | } | |
3252 | } else { | |
3253 | EVP_PKEY *pkey; | |
3254 | i = ssl_verify_cert_chain(s, sk); | |
3255 | if (i <= 0) { | |
3256 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 3257 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3258 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
3259 | goto f_err; | |
3260 | } | |
3261 | if (i > 1) { | |
e27f234a | 3262 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
3263 | al = SSL_AD_HANDSHAKE_FAILURE; |
3264 | goto f_err; | |
3265 | } | |
3266 | pkey = X509_get_pubkey(sk_X509_value(sk, 0)); | |
3267 | if (pkey == NULL) { | |
3268 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3269 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3270 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
3271 | goto f_err; | |
3272 | } | |
3273 | EVP_PKEY_free(pkey); | |
3274 | } | |
3275 | ||
222561fe | 3276 | X509_free(s->session->peer); |
0f113f3e MC |
3277 | s->session->peer = sk_X509_shift(sk); |
3278 | s->session->verify_result = s->verify_result; | |
3279 | ||
c34b0f99 DSH |
3280 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
3281 | s->session->peer_chain = sk; | |
0f113f3e MC |
3282 | /* |
3283 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
3284 | * certificate, while we do include it in s3_clnt.c | |
3285 | */ | |
0f113f3e | 3286 | sk = NULL; |
e27f234a | 3287 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
3288 | goto done; |
3289 | ||
0f113f3e | 3290 | f_err: |
66696478 | 3291 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 3292 | ossl_statem_set_error(s); |
66696478 | 3293 | done: |
222561fe RS |
3294 | X509_free(x); |
3295 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 3296 | return ret; |
0f113f3e | 3297 | } |
d02b48c6 | 3298 | |
e27f234a MC |
3299 | int tls_construct_server_certificate(SSL *s) |
3300 | { | |
3301 | CERT_PKEY *cpk; | |
3302 | ||
3303 | cpk = ssl_get_server_send_pkey(s); | |
3304 | if (cpk == NULL) { | |
3305 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 3306 | ossl_statem_set_error(s); |
e27f234a MC |
3307 | return 0; |
3308 | } | |
3309 | ||
3310 | if (!ssl3_output_cert_chain(s, cpk)) { | |
3311 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 3312 | ossl_statem_set_error(s); |
e27f234a MC |
3313 | return 0; |
3314 | } | |
3315 | ||
3316 | return 1; | |
3317 | } | |
3318 | ||
e27f234a MC |
3319 | int tls_construct_new_session_ticket(SSL *s) |
3320 | { | |
3321 | unsigned char *senc = NULL; | |
3322 | EVP_CIPHER_CTX ctx; | |
3323 | HMAC_CTX hctx; | |
3324 | unsigned char *p, *macstart; | |
3325 | const unsigned char *const_p; | |
3326 | int len, slen_full, slen; | |
3327 | SSL_SESSION *sess; | |
3328 | unsigned int hlen; | |
3329 | SSL_CTX *tctx = s->initial_ctx; | |
3330 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
3331 | unsigned char key_name[16]; | |
3332 | ||
3333 | /* get session encoding length */ | |
3334 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
3335 | /* | |
3336 | * Some length values are 16 bits, so forget it if session is too | |
3337 | * long | |
3338 | */ | |
3339 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 3340 | ossl_statem_set_error(s); |
e27f234a MC |
3341 | return 0; |
3342 | } | |
3343 | senc = OPENSSL_malloc(slen_full); | |
3344 | if (!senc) { | |
fe3a3291 | 3345 | ossl_statem_set_error(s); |
e27f234a MC |
3346 | return 0; |
3347 | } | |
0f113f3e | 3348 | |
e27f234a MC |
3349 | EVP_CIPHER_CTX_init(&ctx); |
3350 | HMAC_CTX_init(&hctx); | |
0f113f3e | 3351 | |
e27f234a MC |
3352 | p = senc; |
3353 | if (!i2d_SSL_SESSION(s->session, &p)) | |
3354 | goto err; | |
687eaf27 | 3355 | |
e27f234a MC |
3356 | /* |
3357 | * create a fresh copy (not shared with other threads) to clean up | |
3358 | */ | |
3359 | const_p = senc; | |
3360 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3361 | if (sess == NULL) | |
3362 | goto err; | |
3363 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3364 | |
e27f234a MC |
3365 | slen = i2d_SSL_SESSION(sess, NULL); |
3366 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3367 | SSL_SESSION_free(sess); | |
3368 | goto err; | |
3369 | } | |
3370 | p = senc; | |
3371 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3372 | SSL_SESSION_free(sess); | |
3373 | goto err; | |
3374 | } | |
3375 | SSL_SESSION_free(sess); | |
0f113f3e | 3376 | |
e27f234a MC |
3377 | /*- |
3378 | * Grow buffer if need be: the length calculation is as | |
3379 | * follows handshake_header_length + | |
3380 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
3381 | * 16 (key name) + max_iv_len (iv length) + | |
3382 | * session_length + max_enc_block_size (max encrypted session | |
3383 | * length) + max_md_size (HMAC). | |
3384 | */ | |
3385 | if (!BUF_MEM_grow(s->init_buf, | |
3386 | SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + | |
3387 | EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) | |
3388 | goto err; | |
0f113f3e | 3389 | |
e27f234a MC |
3390 | p = ssl_handshake_start(s); |
3391 | /* | |
3392 | * Initialize HMAC and cipher contexts. If callback present it does | |
3393 | * all the work otherwise use generated values from parent ctx. | |
3394 | */ | |
3395 | if (tctx->tlsext_ticket_key_cb) { | |
3396 | if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, | |
3397 | &hctx, 1) < 0) | |
3398 | goto err; | |
3399 | } else { | |
3400 | if (RAND_bytes(iv, 16) <= 0) | |
687eaf27 | 3401 | goto err; |
e27f234a MC |
3402 | if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, |
3403 | tctx->tlsext_tick_aes_key, iv)) | |
687eaf27 | 3404 | goto err; |
e27f234a MC |
3405 | if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, |
3406 | EVP_sha256(), NULL)) | |
4f9fab6b | 3407 | goto err; |
e27f234a | 3408 | memcpy(key_name, tctx->tlsext_tick_key_name, 16); |
0f113f3e MC |
3409 | } |
3410 | ||
e27f234a MC |
3411 | /* |
3412 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3413 | * for resumed session (for simplicity), and guess that tickets for | |
3414 | * new sessions will live as long as their sessions. | |
3415 | */ | |
3416 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3417 | ||
3418 | /* Skip ticket length for now */ | |
3419 | p += 2; | |
3420 | /* Output key name */ | |
3421 | macstart = p; | |
3422 | memcpy(p, key_name, 16); | |
3423 | p += 16; | |
3424 | /* output IV */ | |
3425 | memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); | |
3426 | p += EVP_CIPHER_CTX_iv_length(&ctx); | |
3427 | /* Encrypt session data */ | |
3428 | if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen)) | |
3429 | goto err; | |
3430 | p += len; | |
3431 | if (!EVP_EncryptFinal(&ctx, p, &len)) | |
3432 | goto err; | |
3433 | p += len; | |
3434 | ||
3435 | if (!HMAC_Update(&hctx, macstart, p - macstart)) | |
3436 | goto err; | |
3437 | if (!HMAC_Final(&hctx, p, &hlen)) | |
3438 | goto err; | |
3439 | ||
3440 | EVP_CIPHER_CTX_cleanup(&ctx); | |
3441 | HMAC_CTX_cleanup(&hctx); | |
3442 | ||
3443 | p += hlen; | |
3444 | /* Now write out lengths: p points to end of data written */ | |
3445 | /* Total length */ | |
3446 | len = p - ssl_handshake_start(s); | |
3447 | /* Skip ticket lifetime hint */ | |
3448 | p = ssl_handshake_start(s) + 4; | |
3449 | s2n(len - 6, p); | |
3450 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3451 | goto err; | |
3452 | OPENSSL_free(senc); | |
3453 | ||
3454 | return 1; | |
687eaf27 | 3455 | err: |
b548a1f1 | 3456 | OPENSSL_free(senc); |
687eaf27 MC |
3457 | EVP_CIPHER_CTX_cleanup(&ctx); |
3458 | HMAC_CTX_cleanup(&hctx); | |
fe3a3291 | 3459 | ossl_statem_set_error(s); |
e27f234a | 3460 | return 0; |
0f113f3e | 3461 | } |
67c8e7f4 | 3462 | |
e27f234a MC |
3463 | int tls_construct_cert_status(SSL *s) |
3464 | { | |
3465 | unsigned char *p; | |
3466 | /*- | |
3467 | * Grow buffer if need be: the length calculation is as | |
3468 | * follows 1 (message type) + 3 (message length) + | |
3469 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3470 | * + (ocsp response) | |
3471 | */ | |
3472 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3473 | ossl_statem_set_error(s); |
e27f234a MC |
3474 | return 0; |
3475 | } | |
3476 | ||
3477 | p = (unsigned char *)s->init_buf->data; | |
3478 | ||
3479 | /* do the header */ | |
3480 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3481 | /* message length */ | |
3482 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3483 | /* status type */ | |
3484 | *(p++) = s->tlsext_status_type; | |
3485 | /* length of OCSP response */ | |
3486 | l2n3(s->tlsext_ocsp_resplen, p); | |
3487 | /* actual response */ | |
3488 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3489 | /* number of bytes to write */ | |
3490 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3491 | s->init_off = 0; | |
3492 | ||
3493 | return 1; | |
3494 | } | |
3495 | ||
e481f9b9 | 3496 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3497 | /* |
3498 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3499 | * It sets the next_proto member in s if found | |
3500 | */ | |
73999b62 | 3501 | enum MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3502 | { |
73999b62 | 3503 | PACKET next_proto, padding; |
e27f234a MC |
3504 | size_t next_proto_len; |
3505 | ||
50e735f9 MC |
3506 | /*- |
3507 | * The payload looks like: | |
3508 | * uint8 proto_len; | |
3509 | * uint8 proto[proto_len]; | |
3510 | * uint8 padding_len; | |
3511 | * uint8 padding[padding_len]; | |
3512 | */ | |
73999b62 MC |
3513 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3514 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3515 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3516 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3517 | goto err; |
cf9b0b6f | 3518 | } |
0f113f3e | 3519 | |
6d41fc80 EK |
3520 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3521 | &next_proto_len)) { | |
3522 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3523 | goto err; |
3524 | } | |
3525 | ||
6d41fc80 | 3526 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3527 | |
e27f234a | 3528 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3529 | err: |
fe3a3291 | 3530 | ossl_statem_set_error(s); |
e27f234a | 3531 | return MSG_PROCESS_ERROR; |
0f113f3e | 3532 | } |
6434abbf | 3533 | #endif |
d45ba43d MC |
3534 | |
3535 | #define SSLV2_CIPHER_LEN 3 | |
3536 | ||
38a3cbfb EK |
3537 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3538 | PACKET *cipher_suites, | |
d45ba43d | 3539 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3540 | int sslv2format, int *al |
3541 | ) | |
d45ba43d MC |
3542 | { |
3543 | const SSL_CIPHER *c; | |
3544 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3545 | int n; |
3546 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3547 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3548 | |
38a3cbfb EK |
3549 | s->s3->send_connection_binding = 0; |
3550 | ||
3551 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3552 | ||
3553 | if (PACKET_remaining(cipher_suites) == 0) { | |
3554 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3555 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3556 | return NULL; | |
d45ba43d | 3557 | } |
38a3cbfb EK |
3558 | |
3559 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3560 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3561 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3562 | *al = SSL_AD_DECODE_ERROR; |
3563 | return NULL; | |
d45ba43d | 3564 | } |
38a3cbfb | 3565 | |
d45ba43d MC |
3566 | if ((skp == NULL) || (*skp == NULL)) { |
3567 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3568 | if(sk == NULL) { | |
3569 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3570 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3571 | return NULL; |
3572 | } | |
3573 | } else { | |
3574 | sk = *skp; | |
3575 | sk_SSL_CIPHER_zero(sk); | |
3576 | } | |
3577 | ||
38a3cbfb EK |
3578 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3579 | &s->s3->tmp.ciphers_rawlen)) { | |
3580 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3581 | goto err; |
3582 | } | |
d45ba43d | 3583 | |
38a3cbfb EK |
3584 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3585 | /* | |
20218b58 EK |
3586 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3587 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3588 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3589 | */ |
3590 | if (sslv2format && cipher[0] != '\0') | |
3591 | continue; | |
3592 | ||
d45ba43d | 3593 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3594 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3595 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3596 | /* SCSV fatal if renegotiating */ |
3597 | if (s->renegotiate) { | |
3598 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3599 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3600 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3601 | goto err; |
3602 | } | |
3603 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3604 | #ifdef OPENSSL_RI_DEBUG |
3605 | fprintf(stderr, "SCSV received by server\n"); | |
3606 | #endif | |
3607 | continue; | |
3608 | } | |
3609 | ||
3610 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3611 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3612 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3613 | /* |
3614 | * The SCSV indicates that the client previously tried a higher | |
3615 | * version. Fail if the current version is an unexpected | |
3616 | * downgrade. | |
3617 | */ | |
3618 | if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) { | |
3619 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3620 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3621 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3622 | goto err; |
3623 | } | |
d45ba43d MC |
3624 | continue; |
3625 | } | |
3626 | ||
38a3cbfb EK |
3627 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3628 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3629 | if (c != NULL) { |
3630 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3631 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3632 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3633 | goto err; |
3634 | } | |
3635 | } | |
3636 | } | |
38a3cbfb EK |
3637 | if (PACKET_remaining(cipher_suites) > 0) { |
3638 | *al = SSL_AD_INTERNAL_ERROR; | |
3639 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3640 | goto err; | |
3641 | } | |
d45ba43d MC |
3642 | |
3643 | if (skp != NULL) | |
3644 | *skp = sk; | |
3645 | return (sk); | |
3646 | err: | |
3647 | if ((skp == NULL) || (*skp == NULL)) | |
3648 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3649 | return NULL; |
d45ba43d | 3650 | } |