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846e33c7 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
8e2f6b79 | 3 | * |
846e33c7 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8e2f6b79 | 8 | */ |
846e33c7 | 9 | |
ea262260 BM |
10 | /* ==================================================================== |
11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
12 | * | |
0f113f3e | 13 | * Portions of the attached software ("Contribution") are developed by |
ea262260 BM |
14 | * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
15 | * | |
16 | * The Contribution is licensed pursuant to the OpenSSL open source | |
17 | * license provided above. | |
18 | * | |
ea262260 BM |
19 | * ECC cipher suite support in OpenSSL originally written by |
20 | * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. | |
21 | * | |
22 | */ | |
ddac1974 NL |
23 | /* ==================================================================== |
24 | * Copyright 2005 Nokia. All rights reserved. | |
25 | * | |
26 | * The portions of the attached software ("Contribution") is developed by | |
27 | * Nokia Corporation and is licensed pursuant to the OpenSSL open source | |
28 | * license. | |
29 | * | |
30 | * The Contribution, originally written by Mika Kousa and Pasi Eronen of | |
31 | * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites | |
32 | * support (see RFC 4279) to OpenSSL. | |
33 | * | |
34 | * No patent licenses or other rights except those expressly stated in | |
35 | * the OpenSSL open source license shall be deemed granted or received | |
36 | * expressly, by implication, estoppel, or otherwise. | |
37 | * | |
38 | * No assurances are provided by Nokia that the Contribution does not | |
39 | * infringe the patent or other intellectual property rights of any third | |
40 | * party or that the license provides you with all the necessary rights | |
41 | * to make use of the Contribution. | |
42 | * | |
43 | * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN | |
44 | * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA | |
45 | * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY | |
46 | * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR | |
47 | * OTHERWISE. | |
48 | */ | |
d02b48c6 | 49 | |
de469ef2 | 50 | |
d02b48c6 | 51 | #include <stdio.h> |
8ba708e5 | 52 | #include "../ssl_locl.h" |
61ae935a | 53 | #include "statem_locl.h" |
68570797 | 54 | #include "internal/constant_time_locl.h" |
ec577822 BM |
55 | #include <openssl/buffer.h> |
56 | #include <openssl/rand.h> | |
57 | #include <openssl/objects.h> | |
58 | #include <openssl/evp.h> | |
6434abbf | 59 | #include <openssl/hmac.h> |
ec577822 | 60 | #include <openssl/x509.h> |
3c27208f | 61 | #include <openssl/dh.h> |
d095b68d | 62 | #include <openssl/bn.h> |
dbad1690 | 63 | #include <openssl/md5.h> |
f9b3bff6 | 64 | |
38a3cbfb EK |
65 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
66 | PACKET *cipher_suites, | |
67 | STACK_OF(SSL_CIPHER) **skp, | |
68 | int sslv2format, int *al); | |
d45ba43d | 69 | |
61ae935a MC |
70 | /* |
71 | * server_read_transition() encapsulates the logic for the allowed handshake | |
72 | * state transitions when the server is reading messages from the client. The | |
73 | * message type that the client has sent is provided in |mt|. The current state | |
74 | * is in |s->statem.hand_state|. | |
75 | * | |
76 | * Valid return values are: | |
77 | * 1: Success (transition allowed) | |
78 | * 0: Error (transition not allowed) | |
79 | */ | |
8481f583 | 80 | int ossl_statem_server_read_transition(SSL *s, int mt) |
61ae935a | 81 | { |
d6f1a6e9 | 82 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
83 | |
84 | switch(st->hand_state) { | |
85 | case TLS_ST_BEFORE: | |
86 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
87 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
88 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
89 | return 1; | |
90 | } | |
91 | break; | |
92 | ||
93 | case TLS_ST_SW_SRVR_DONE: | |
94 | /* | |
95 | * If we get a CKE message after a ServerDone then either | |
96 | * 1) We didn't request a Certificate | |
97 | * OR | |
98 | * 2) If we did request one then | |
99 | * a) We allow no Certificate to be returned | |
100 | * AND | |
101 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
102 | * list if we requested a certificate) | |
103 | */ | |
0f512756 MC |
104 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { |
105 | if (s->s3->tmp.cert_request) { | |
106 | if (s->version == SSL3_VERSION) { | |
23dd09b5 MC |
107 | if ((s->verify_mode & SSL_VERIFY_PEER) |
108 | && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
0f512756 MC |
109 | /* |
110 | * This isn't an unexpected message as such - we're just | |
23dd09b5 MC |
111 | * not going to accept it because we require a client |
112 | * cert. | |
0f512756 MC |
113 | */ |
114 | ssl3_send_alert(s, SSL3_AL_FATAL, | |
115 | SSL3_AD_HANDSHAKE_FAILURE); | |
116 | SSLerr(SSL_F_READ_STATE_MACHINE, | |
117 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); | |
118 | return 0; | |
119 | } | |
120 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
121 | return 1; | |
122 | } | |
123 | } else { | |
124 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
125 | return 1; | |
126 | } | |
61ae935a MC |
127 | } else if (s->s3->tmp.cert_request) { |
128 | if (mt == SSL3_MT_CERTIFICATE) { | |
129 | st->hand_state = TLS_ST_SR_CERT; | |
130 | return 1; | |
f100b031 | 131 | } |
61ae935a MC |
132 | } |
133 | break; | |
134 | ||
135 | case TLS_ST_SR_CERT: | |
136 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
137 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
138 | return 1; | |
139 | } | |
140 | break; | |
141 | ||
142 | case TLS_ST_SR_KEY_EXCH: | |
143 | /* | |
144 | * We should only process a CertificateVerify message if we have | |
145 | * received a Certificate from the client. If so then |s->session->peer| | |
146 | * will be non NULL. In some instances a CertificateVerify message is | |
147 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 148 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
149 | * set. |
150 | */ | |
a71a4966 | 151 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
152 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
153 | /* | |
154 | * For the ECDH ciphersuites when the client sends its ECDH | |
155 | * pub key in a certificate, the CertificateVerify message is | |
156 | * not sent. Also for GOST ciphersuites when the client uses | |
157 | * its key from the certificate for key exchange. | |
158 | */ | |
159 | st->hand_state = TLS_ST_SR_CHANGE; | |
160 | return 1; | |
161 | } | |
162 | } else { | |
163 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
164 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
165 | return 1; | |
166 | } | |
167 | } | |
168 | break; | |
169 | ||
170 | case TLS_ST_SR_CERT_VRFY: | |
171 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
172 | st->hand_state = TLS_ST_SR_CHANGE; | |
173 | return 1; | |
174 | } | |
175 | break; | |
176 | ||
177 | case TLS_ST_SR_CHANGE: | |
178 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
179 | if (s->s3->next_proto_neg_seen) { | |
180 | if (mt == SSL3_MT_NEXT_PROTO) { | |
181 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
182 | return 1; | |
183 | } | |
184 | } else { | |
185 | #endif | |
186 | if (mt == SSL3_MT_FINISHED) { | |
187 | st->hand_state = TLS_ST_SR_FINISHED; | |
188 | return 1; | |
189 | } | |
190 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
191 | } | |
192 | #endif | |
193 | break; | |
194 | ||
195 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
196 | case TLS_ST_SR_NEXT_PROTO: | |
197 | if (mt == SSL3_MT_FINISHED) { | |
198 | st->hand_state = TLS_ST_SR_FINISHED; | |
199 | return 1; | |
200 | } | |
201 | break; | |
202 | #endif | |
203 | ||
204 | case TLS_ST_SW_FINISHED: | |
205 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
206 | st->hand_state = TLS_ST_SR_CHANGE; | |
207 | return 1; | |
208 | } | |
209 | break; | |
210 | ||
211 | default: | |
212 | break; | |
213 | } | |
214 | ||
215 | /* No valid transition found */ | |
672f3337 MC |
216 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); |
217 | SSLerr(SSL_F_READ_STATE_MACHINE, SSL_R_UNEXPECTED_MESSAGE); | |
61ae935a MC |
218 | return 0; |
219 | } | |
220 | ||
221 | /* | |
222 | * Should we send a ServerKeyExchange message? | |
223 | * | |
224 | * Valid return values are: | |
225 | * 1: Yes | |
226 | * 0: No | |
227 | */ | |
bb3e20cf | 228 | static int send_server_key_exchange(SSL *s) |
61ae935a MC |
229 | { |
230 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
231 | ||
232 | /* | |
361a1191 | 233 | * only send a ServerKeyExchange if DH or fortezza but we have a |
61ae935a MC |
234 | * sign only certificate PSK: may send PSK identity hints For |
235 | * ECC ciphersuites, we send a serverKeyExchange message only if | |
236 | * the cipher suite is either ECDH-anon or ECDHE. In other cases, | |
237 | * the server certificate contains the server's public key for | |
238 | * key exchange. | |
239 | */ | |
bc71f910 | 240 | if (alg_k & (SSL_kDHE|SSL_kECDHE) |
61ae935a MC |
241 | /* |
242 | * PSK: send ServerKeyExchange if PSK identity hint if | |
243 | * provided | |
244 | */ | |
245 | #ifndef OPENSSL_NO_PSK | |
246 | /* Only send SKE if we have identity hint for plain PSK */ | |
247 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
248 | && s->cert->psk_identity_hint) | |
249 | /* For other PSK always send SKE */ | |
250 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
251 | #endif | |
252 | #ifndef OPENSSL_NO_SRP | |
253 | /* SRP: send ServerKeyExchange */ | |
254 | || (alg_k & SSL_kSRP) | |
255 | #endif | |
256 | ) { | |
257 | return 1; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Should we send a CertificateRequest message? | |
265 | * | |
266 | * Valid return values are: | |
267 | * 1: Yes | |
268 | * 0: No | |
269 | */ | |
bb3e20cf | 270 | static int send_certificate_request(SSL *s) |
61ae935a MC |
271 | { |
272 | if ( | |
273 | /* don't request cert unless asked for it: */ | |
274 | s->verify_mode & SSL_VERIFY_PEER | |
275 | /* | |
276 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
277 | * during re-negotiation: | |
278 | */ | |
279 | && ((s->session->peer == NULL) || | |
280 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) | |
281 | /* | |
282 | * never request cert in anonymous ciphersuites (see | |
283 | * section "Certificate request" in SSL 3 drafts and in | |
284 | * RFC 2246): | |
285 | */ | |
286 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
287 | /* | |
288 | * ... except when the application insists on | |
d4d78943 | 289 | * verification (against the specs, but statem_clnt.c accepts |
61ae935a MC |
290 | * this for SSL 3) |
291 | */ | |
292 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) | |
293 | /* don't request certificate for SRP auth */ | |
294 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
295 | /* | |
296 | * With normal PSK Certificates and Certificate Requests | |
297 | * are omitted | |
298 | */ | |
b7fa1f98 | 299 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { |
61ae935a MC |
300 | return 1; |
301 | } | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * server_write_transition() works out what handshake state to move to next | |
308 | * when the server is writing messages to be sent to the client. | |
309 | */ | |
8481f583 | 310 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s) |
61ae935a | 311 | { |
d6f1a6e9 | 312 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
313 | |
314 | switch(st->hand_state) { | |
315 | case TLS_ST_BEFORE: | |
316 | /* Just go straight to trying to read from the client */; | |
317 | return WRITE_TRAN_FINISHED; | |
318 | ||
319 | case TLS_ST_OK: | |
320 | /* We must be trying to renegotiate */ | |
321 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
322 | return WRITE_TRAN_CONTINUE; | |
323 | ||
324 | case TLS_ST_SW_HELLO_REQ: | |
325 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 326 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
327 | return WRITE_TRAN_CONTINUE; |
328 | ||
329 | case TLS_ST_SR_CLNT_HELLO: | |
330 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
331 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) | |
332 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; | |
333 | else | |
334 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
335 | return WRITE_TRAN_CONTINUE; | |
336 | ||
337 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
338 | return WRITE_TRAN_FINISHED; | |
339 | ||
340 | case TLS_ST_SW_SRVR_HELLO: | |
341 | if (s->hit) { | |
342 | if (s->tlsext_ticket_expected) | |
343 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
344 | else | |
345 | st->hand_state = TLS_ST_SW_CHANGE; | |
346 | } else { | |
347 | /* Check if it is anon DH or anon ECDH, */ | |
348 | /* normal PSK or SRP */ | |
349 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
350 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { | |
351 | st->hand_state = TLS_ST_SW_CERT; | |
352 | } else if (send_server_key_exchange(s)) { | |
353 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
354 | } else if (send_certificate_request(s)) { | |
355 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
356 | } else { | |
357 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
358 | } | |
359 | } | |
360 | return WRITE_TRAN_CONTINUE; | |
361 | ||
362 | case TLS_ST_SW_CERT: | |
363 | if (s->tlsext_status_expected) { | |
364 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
365 | return WRITE_TRAN_CONTINUE; | |
366 | } | |
367 | /* Fall through */ | |
368 | ||
369 | case TLS_ST_SW_CERT_STATUS: | |
370 | if (send_server_key_exchange(s)) { | |
371 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
372 | return WRITE_TRAN_CONTINUE; | |
373 | } | |
374 | /* Fall through */ | |
375 | ||
376 | case TLS_ST_SW_KEY_EXCH: | |
377 | if (send_certificate_request(s)) { | |
378 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
379 | return WRITE_TRAN_CONTINUE; | |
380 | } | |
381 | /* Fall through */ | |
382 | ||
383 | case TLS_ST_SW_CERT_REQ: | |
384 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
385 | return WRITE_TRAN_CONTINUE; | |
386 | ||
387 | case TLS_ST_SW_SRVR_DONE: | |
388 | return WRITE_TRAN_FINISHED; | |
389 | ||
390 | case TLS_ST_SR_FINISHED: | |
391 | if (s->hit) { | |
392 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 393 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
394 | return WRITE_TRAN_CONTINUE; |
395 | } else if (s->tlsext_ticket_expected) { | |
396 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
397 | } else { | |
398 | st->hand_state = TLS_ST_SW_CHANGE; | |
399 | } | |
400 | return WRITE_TRAN_CONTINUE; | |
401 | ||
402 | case TLS_ST_SW_SESSION_TICKET: | |
403 | st->hand_state = TLS_ST_SW_CHANGE; | |
404 | return WRITE_TRAN_CONTINUE; | |
405 | ||
406 | case TLS_ST_SW_CHANGE: | |
407 | st->hand_state = TLS_ST_SW_FINISHED; | |
408 | return WRITE_TRAN_CONTINUE; | |
409 | ||
410 | case TLS_ST_SW_FINISHED: | |
411 | if (s->hit) { | |
412 | return WRITE_TRAN_FINISHED; | |
413 | } | |
414 | st->hand_state = TLS_ST_OK; | |
fe3a3291 | 415 | ossl_statem_set_in_init(s, 0); |
61ae935a MC |
416 | return WRITE_TRAN_CONTINUE; |
417 | ||
418 | default: | |
419 | /* Shouldn't happen */ | |
420 | return WRITE_TRAN_ERROR; | |
421 | } | |
422 | } | |
423 | ||
424 | /* | |
425 | * Perform any pre work that needs to be done prior to sending a message from | |
426 | * the server to the client. | |
427 | */ | |
8481f583 | 428 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) |
61ae935a | 429 | { |
d6f1a6e9 | 430 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
431 | |
432 | switch(st->hand_state) { | |
433 | case TLS_ST_SW_HELLO_REQ: | |
434 | s->shutdown = 0; | |
435 | if (SSL_IS_DTLS(s)) | |
436 | dtls1_clear_record_buffer(s); | |
437 | break; | |
438 | ||
439 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
440 | s->shutdown = 0; | |
441 | if (SSL_IS_DTLS(s)) { | |
442 | dtls1_clear_record_buffer(s); | |
443 | /* We don't buffer this message so don't use the timer */ | |
444 | st->use_timer = 0; | |
445 | } | |
446 | break; | |
447 | ||
448 | case TLS_ST_SW_SRVR_HELLO: | |
449 | if (SSL_IS_DTLS(s)) { | |
450 | /* | |
451 | * Messages we write from now on should be bufferred and | |
452 | * retransmitted if necessary, so we need to use the timer now | |
453 | */ | |
454 | st->use_timer = 1; | |
455 | } | |
456 | break; | |
457 | ||
458 | case TLS_ST_SW_SRVR_DONE: | |
459 | #ifndef OPENSSL_NO_SCTP | |
460 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
461 | return dtls_wait_for_dry(s); | |
462 | #endif | |
463 | return WORK_FINISHED_CONTINUE; | |
464 | ||
465 | case TLS_ST_SW_SESSION_TICKET: | |
466 | if (SSL_IS_DTLS(s)) { | |
467 | /* | |
468 | * We're into the last flight. We don't retransmit the last flight | |
469 | * unless we need to, so we don't use the timer | |
470 | */ | |
471 | st->use_timer = 0; | |
472 | } | |
473 | break; | |
474 | ||
475 | case TLS_ST_SW_CHANGE: | |
476 | s->session->cipher = s->s3->tmp.new_cipher; | |
477 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 478 | ossl_statem_set_error(s); |
61ae935a MC |
479 | return WORK_ERROR; |
480 | } | |
481 | if (SSL_IS_DTLS(s)) { | |
482 | /* | |
483 | * We're into the last flight. We don't retransmit the last flight | |
484 | * unless we need to, so we don't use the timer. This might have | |
485 | * already been set to 0 if we sent a NewSessionTicket message, | |
486 | * but we'll set it again here in case we didn't. | |
487 | */ | |
488 | st->use_timer = 0; | |
489 | } | |
490 | return WORK_FINISHED_CONTINUE; | |
491 | ||
492 | case TLS_ST_OK: | |
493 | return tls_finish_handshake(s, wst); | |
494 | ||
495 | default: | |
496 | /* No pre work to be done */ | |
497 | break; | |
498 | } | |
499 | ||
500 | return WORK_FINISHED_CONTINUE; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Perform any work that needs to be done after sending a message from the | |
505 | * server to the client. | |
506 | */ | |
8481f583 | 507 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) |
61ae935a | 508 | { |
d6f1a6e9 | 509 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
510 | |
511 | s->init_num = 0; | |
512 | ||
513 | switch(st->hand_state) { | |
514 | case TLS_ST_SW_HELLO_REQ: | |
515 | if (statem_flush(s) != 1) | |
516 | return WORK_MORE_A; | |
2c4a056f MC |
517 | if (!ssl3_init_finished_mac(s)) { |
518 | ossl_statem_set_error(s); | |
519 | return WORK_ERROR; | |
520 | } | |
61ae935a MC |
521 | break; |
522 | ||
523 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
524 | if (statem_flush(s) != 1) | |
525 | return WORK_MORE_A; | |
526 | /* HelloVerifyRequest resets Finished MAC */ | |
2c4a056f MC |
527 | if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) { |
528 | ossl_statem_set_error(s); | |
529 | return WORK_ERROR; | |
530 | } | |
61ae935a MC |
531 | /* |
532 | * The next message should be another ClientHello which we need to | |
533 | * treat like it was the first packet | |
534 | */ | |
535 | s->first_packet = 1; | |
536 | break; | |
537 | ||
538 | case TLS_ST_SW_SRVR_HELLO: | |
539 | #ifndef OPENSSL_NO_SCTP | |
540 | if (SSL_IS_DTLS(s) && s->hit) { | |
541 | unsigned char sctpauthkey[64]; | |
542 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
543 | ||
544 | /* | |
545 | * Add new shared key for SCTP-Auth, will be ignored if no | |
546 | * SCTP used. | |
547 | */ | |
141eb8c6 MC |
548 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
549 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
550 | |
551 | if (SSL_export_keying_material(s, sctpauthkey, | |
552 | sizeof(sctpauthkey), labelbuffer, | |
553 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 554 | ossl_statem_set_error(s); |
61ae935a MC |
555 | return WORK_ERROR; |
556 | } | |
557 | ||
558 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
559 | sizeof(sctpauthkey), sctpauthkey); | |
560 | } | |
561 | #endif | |
562 | break; | |
563 | ||
564 | case TLS_ST_SW_CHANGE: | |
565 | #ifndef OPENSSL_NO_SCTP | |
566 | if (SSL_IS_DTLS(s) && !s->hit) { | |
567 | /* | |
568 | * Change to new shared key of SCTP-Auth, will be ignored if | |
569 | * no SCTP used. | |
570 | */ | |
571 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
572 | 0, NULL); | |
573 | } | |
574 | #endif | |
575 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
576 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { | |
fe3a3291 | 577 | ossl_statem_set_error(s); |
61ae935a MC |
578 | return WORK_ERROR; |
579 | } | |
580 | ||
581 | if (SSL_IS_DTLS(s)) | |
582 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
583 | break; | |
584 | ||
585 | case TLS_ST_SW_SRVR_DONE: | |
586 | if (statem_flush(s) != 1) | |
587 | return WORK_MORE_A; | |
588 | break; | |
589 | ||
590 | case TLS_ST_SW_FINISHED: | |
591 | if (statem_flush(s) != 1) | |
592 | return WORK_MORE_A; | |
593 | #ifndef OPENSSL_NO_SCTP | |
594 | if (SSL_IS_DTLS(s) && s->hit) { | |
595 | /* | |
596 | * Change to new shared key of SCTP-Auth, will be ignored if | |
597 | * no SCTP used. | |
598 | */ | |
599 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
600 | 0, NULL); | |
601 | } | |
602 | #endif | |
603 | break; | |
604 | ||
605 | default: | |
606 | /* No post work to be done */ | |
607 | break; | |
608 | } | |
609 | ||
610 | return WORK_FINISHED_CONTINUE; | |
611 | } | |
612 | ||
613 | /* | |
614 | * Construct a message to be sent from the server to the client. | |
615 | * | |
616 | * Valid return values are: | |
617 | * 1: Success | |
618 | * 0: Error | |
619 | */ | |
8481f583 | 620 | int ossl_statem_server_construct_message(SSL *s) |
61ae935a | 621 | { |
d6f1a6e9 | 622 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
623 | |
624 | switch(st->hand_state) { | |
625 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
626 | return dtls_construct_hello_verify_request(s); | |
627 | ||
628 | case TLS_ST_SW_HELLO_REQ: | |
629 | return tls_construct_hello_request(s); | |
630 | ||
631 | case TLS_ST_SW_SRVR_HELLO: | |
632 | return tls_construct_server_hello(s); | |
633 | ||
634 | case TLS_ST_SW_CERT: | |
635 | return tls_construct_server_certificate(s); | |
636 | ||
637 | case TLS_ST_SW_KEY_EXCH: | |
638 | return tls_construct_server_key_exchange(s); | |
639 | ||
640 | case TLS_ST_SW_CERT_REQ: | |
641 | return tls_construct_certificate_request(s); | |
642 | ||
643 | case TLS_ST_SW_SRVR_DONE: | |
644 | return tls_construct_server_done(s); | |
645 | ||
646 | case TLS_ST_SW_SESSION_TICKET: | |
647 | return tls_construct_new_session_ticket(s); | |
648 | ||
649 | case TLS_ST_SW_CERT_STATUS: | |
650 | return tls_construct_cert_status(s); | |
651 | ||
652 | case TLS_ST_SW_CHANGE: | |
653 | if (SSL_IS_DTLS(s)) | |
654 | return dtls_construct_change_cipher_spec(s); | |
655 | else | |
656 | return tls_construct_change_cipher_spec(s); | |
657 | ||
658 | case TLS_ST_SW_FINISHED: | |
659 | return tls_construct_finished(s, | |
660 | s->method-> | |
661 | ssl3_enc->server_finished_label, | |
662 | s->method-> | |
663 | ssl3_enc->server_finished_label_len); | |
664 | ||
665 | default: | |
666 | /* Shouldn't happen */ | |
667 | break; | |
668 | } | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
8a18bc25 AG |
673 | /* |
674 | * Maximum size (excluding the Handshake header) of a ClientHello message, | |
675 | * calculated as follows: | |
676 | * | |
677 | * 2 + # client_version | |
678 | * 32 + # only valid length for random | |
679 | * 1 + # length of session_id | |
680 | * 32 + # maximum size for session_id | |
681 | * 2 + # length of cipher suites | |
682 | * 2^16-2 + # maximum length of cipher suites array | |
683 | * 1 + # length of compression_methods | |
684 | * 2^8-1 + # maximum length of compression methods | |
685 | * 2 + # length of extensions | |
686 | * 2^16-1 # maximum length of extensions | |
687 | */ | |
688 | #define CLIENT_HELLO_MAX_LENGTH 131396 | |
689 | ||
61ae935a MC |
690 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 |
691 | #define NEXT_PROTO_MAX_LENGTH 514 | |
692 | ||
693 | /* | |
694 | * Returns the maximum allowed length for the current message that we are | |
695 | * reading. Excludes the message header. | |
696 | */ | |
8481f583 | 697 | unsigned long ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 698 | { |
d6f1a6e9 | 699 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
700 | |
701 | switch(st->hand_state) { | |
702 | case TLS_ST_SR_CLNT_HELLO: | |
8a18bc25 | 703 | return CLIENT_HELLO_MAX_LENGTH; |
61ae935a MC |
704 | |
705 | case TLS_ST_SR_CERT: | |
706 | return s->max_cert_list; | |
707 | ||
708 | case TLS_ST_SR_KEY_EXCH: | |
709 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
710 | ||
711 | case TLS_ST_SR_CERT_VRFY: | |
712 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
713 | ||
714 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
715 | case TLS_ST_SR_NEXT_PROTO: | |
716 | return NEXT_PROTO_MAX_LENGTH; | |
717 | #endif | |
718 | ||
719 | case TLS_ST_SR_CHANGE: | |
720 | return CCS_MAX_LENGTH; | |
721 | ||
722 | case TLS_ST_SR_FINISHED: | |
723 | return FINISHED_MAX_LENGTH; | |
724 | ||
725 | default: | |
726 | /* Shouldn't happen */ | |
727 | break; | |
728 | } | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Process a message that the server has received from the client. | |
735 | */ | |
8481f583 | 736 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 737 | { |
d6f1a6e9 | 738 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
739 | |
740 | switch(st->hand_state) { | |
741 | case TLS_ST_SR_CLNT_HELLO: | |
742 | return tls_process_client_hello(s, pkt); | |
743 | ||
744 | case TLS_ST_SR_CERT: | |
745 | return tls_process_client_certificate(s, pkt); | |
746 | ||
747 | case TLS_ST_SR_KEY_EXCH: | |
748 | return tls_process_client_key_exchange(s, pkt); | |
749 | ||
750 | case TLS_ST_SR_CERT_VRFY: | |
751 | return tls_process_cert_verify(s, pkt); | |
752 | ||
753 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
754 | case TLS_ST_SR_NEXT_PROTO: | |
755 | return tls_process_next_proto(s, pkt); | |
756 | #endif | |
757 | ||
758 | case TLS_ST_SR_CHANGE: | |
759 | return tls_process_change_cipher_spec(s, pkt); | |
760 | ||
761 | case TLS_ST_SR_FINISHED: | |
762 | return tls_process_finished(s, pkt); | |
763 | ||
764 | default: | |
765 | /* Shouldn't happen */ | |
766 | break; | |
767 | } | |
768 | ||
769 | return MSG_PROCESS_ERROR; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Perform any further processing required following the receipt of a message | |
774 | * from the client | |
775 | */ | |
8481f583 | 776 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 777 | { |
d6f1a6e9 | 778 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
779 | |
780 | switch(st->hand_state) { | |
781 | case TLS_ST_SR_CLNT_HELLO: | |
782 | return tls_post_process_client_hello(s, wst); | |
783 | ||
784 | case TLS_ST_SR_KEY_EXCH: | |
785 | return tls_post_process_client_key_exchange(s, wst); | |
786 | ||
787 | case TLS_ST_SR_CERT_VRFY: | |
788 | #ifndef OPENSSL_NO_SCTP | |
789 | if ( /* Is this SCTP? */ | |
790 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
791 | /* Are we renegotiating? */ | |
792 | && s->renegotiate | |
793 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
794 | s->s3->in_read_app_data = 2; | |
795 | s->rwstate = SSL_READING; | |
796 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
797 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 798 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
799 | return WORK_MORE_A; |
800 | } else { | |
d99b0691 | 801 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
802 | } |
803 | #endif | |
804 | return WORK_FINISHED_CONTINUE; | |
805 | ||
61ae935a MC |
806 | default: |
807 | break; | |
808 | } | |
809 | ||
810 | /* Shouldn't happen */ | |
811 | return WORK_ERROR; | |
812 | } | |
813 | ||
edc032b5 | 814 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 815 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
816 | { |
817 | int ret = SSL_ERROR_NONE; | |
818 | ||
819 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
820 | ||
821 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
822 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
823 | if (s->srp_ctx.login == NULL) { | |
824 | /* | |
825 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
826 | * login name | |
827 | */ | |
828 | ret = SSL3_AL_FATAL; | |
829 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
830 | } else { | |
831 | ret = SSL_srp_server_param_with_username(s, al); | |
832 | } | |
833 | } | |
834 | return ret; | |
835 | } | |
edc032b5 BL |
836 | #endif |
837 | ||
e27f234a MC |
838 | int tls_construct_hello_request(SSL *s) |
839 | { | |
840 | if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) { | |
841 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 842 | ossl_statem_set_error(s); |
e27f234a MC |
843 | return 0; |
844 | } | |
845 | ||
846 | return 1; | |
847 | } | |
848 | ||
8ba708e5 MC |
849 | unsigned int dtls_raw_hello_verify_request(unsigned char *buf, |
850 | unsigned char *cookie, | |
851 | unsigned char cookie_len) | |
852 | { | |
853 | unsigned int msg_len; | |
854 | unsigned char *p; | |
855 | ||
856 | p = buf; | |
857 | /* Always use DTLS 1.0 version: see RFC 6347 */ | |
858 | *(p++) = DTLS1_VERSION >> 8; | |
859 | *(p++) = DTLS1_VERSION & 0xFF; | |
860 | ||
861 | *(p++) = (unsigned char)cookie_len; | |
862 | memcpy(p, cookie, cookie_len); | |
863 | p += cookie_len; | |
864 | msg_len = p - buf; | |
865 | ||
866 | return msg_len; | |
867 | } | |
868 | ||
869 | int dtls_construct_hello_verify_request(SSL *s) | |
870 | { | |
871 | unsigned int len; | |
872 | unsigned char *buf; | |
873 | ||
874 | buf = (unsigned char *)s->init_buf->data; | |
875 | ||
876 | if (s->ctx->app_gen_cookie_cb == NULL || | |
877 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
878 | &(s->d1->cookie_len)) == 0 || | |
879 | s->d1->cookie_len > 255) { | |
f0659bdb | 880 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 881 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
fe3a3291 | 882 | ossl_statem_set_error(s); |
8ba708e5 MC |
883 | return 0; |
884 | } | |
885 | ||
886 | len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH], | |
887 | s->d1->cookie, s->d1->cookie_len); | |
888 | ||
a773b52a | 889 | dtls1_set_message_header(s, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, |
8ba708e5 MC |
890 | len); |
891 | len += DTLS1_HM_HEADER_LENGTH; | |
892 | ||
893 | /* number of bytes to write */ | |
894 | s->init_num = len; | |
895 | s->init_off = 0; | |
896 | ||
897 | return 1; | |
898 | } | |
899 | ||
be3583fa | 900 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
901 | { |
902 | int i, al = SSL_AD_INTERNAL_ERROR; | |
903 | unsigned int j, complen = 0; | |
904 | unsigned long id; | |
4a640fb6 | 905 | const SSL_CIPHER *c; |
e27f234a MC |
906 | #ifndef OPENSSL_NO_COMP |
907 | SSL_COMP *comp = NULL; | |
908 | #endif | |
909 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
4fa52141 | 910 | int protverr; |
e27f234a | 911 | /* |cookie| will only be initialized for DTLS. */ |
73999b62 | 912 | PACKET session_id, cipher_suites, compression, extensions, cookie; |
e27f234a | 913 | int is_v2_record; |
6e3ff632 | 914 | static const unsigned char null_compression = 0; |
e27f234a | 915 | |
b3e2272c EK |
916 | is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
917 | ||
bbafa47b | 918 | PACKET_null_init(&cookie); |
32ec4153 | 919 | /* First lets get s->client_version set correctly */ |
b3e2272c | 920 | if (is_v2_record) { |
9ceb2426 MC |
921 | unsigned int version; |
922 | unsigned int mt; | |
32ec4153 MC |
923 | /*- |
924 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
925 | * header is sent directly on the wire, not wrapped as a TLS | |
926 | * record. Our record layer just processes the message length and passes | |
927 | * the rest right through. Its format is: | |
928 | * Byte Content | |
929 | * 0-1 msg_length - decoded by the record layer | |
930 | * 2 msg_type - s->init_msg points here | |
931 | * 3-4 version | |
932 | * 5-6 cipher_spec_length | |
933 | * 7-8 session_id_length | |
934 | * 9-10 challenge_length | |
935 | * ... ... | |
936 | */ | |
937 | ||
73999b62 | 938 | if (!PACKET_get_1(pkt, &mt) |
9ceb2426 | 939 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
940 | /* |
941 | * Should never happen. We should have tested this in the record | |
942 | * layer in order to have determined that this is a SSLv2 record | |
943 | * in the first place | |
944 | */ | |
e27f234a | 945 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 946 | goto err; |
32ec4153 MC |
947 | } |
948 | ||
73999b62 | 949 | if (!PACKET_get_net_2(pkt, &version)) { |
9ceb2426 | 950 | /* No protocol version supplied! */ |
e27f234a | 951 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
9ceb2426 MC |
952 | goto err; |
953 | } | |
954 | if (version == 0x0002) { | |
32ec4153 | 955 | /* This is real SSLv2. We don't support it. */ |
e27f234a | 956 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 | 957 | goto err; |
9ceb2426 | 958 | } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) { |
32ec4153 | 959 | /* SSLv3/TLS */ |
9ceb2426 | 960 | s->client_version = version; |
32ec4153 MC |
961 | } else { |
962 | /* No idea what protocol this is */ | |
e27f234a | 963 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
32ec4153 MC |
964 | goto err; |
965 | } | |
966 | } else { | |
967 | /* | |
9ceb2426 MC |
968 | * use version from inside client hello, not from record header (may |
969 | * differ: see RFC 2246, Appendix E, second paragraph) | |
32ec4153 | 970 | */ |
73999b62 | 971 | if(!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) { |
32ec4153 | 972 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 973 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); |
32ec4153 MC |
974 | goto f_err; |
975 | } | |
5e9f0eeb MC |
976 | } |
977 | ||
4fa52141 VD |
978 | /* |
979 | * Do SSL/TLS version negotiation if applicable. For DTLS we just check | |
980 | * versions are potentially compatible. Version negotiation comes later. | |
981 | */ | |
32ec4153 | 982 | if (!SSL_IS_DTLS(s)) { |
4fa52141 VD |
983 | protverr = ssl_choose_server_version(s); |
984 | } else if (s->method->version != DTLS_ANY_VERSION && | |
985 | DTLS_VERSION_LT(s->client_version, s->version)) { | |
986 | protverr = SSL_R_VERSION_TOO_LOW; | |
987 | } else { | |
32ec4153 MC |
988 | protverr = 0; |
989 | } | |
990 | ||
991 | if (protverr) { | |
4fa52141 | 992 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); |
32ec4153 | 993 | if ((!s->enc_write_ctx && !s->write_hash)) { |
0f113f3e MC |
994 | /* |
995 | * similar to ssl3_get_record, send alert using remote version | |
996 | * number | |
997 | */ | |
998 | s->version = s->client_version; | |
999 | } | |
1000 | al = SSL_AD_PROTOCOL_VERSION; | |
1001 | goto f_err; | |
1002 | } | |
1003 | ||
b3e2272c EK |
1004 | /* Parse the message and load client random. */ |
1005 | if (is_v2_record) { | |
32ec4153 MC |
1006 | /* |
1007 | * Handle an SSLv2 backwards compatible ClientHello | |
1008 | * Note, this is only for SSLv3+ using the backward compatible format. | |
1009 | * Real SSLv2 is not supported, and is rejected above. | |
1010 | */ | |
ec30e856 | 1011 | unsigned int cipher_len, session_id_len, challenge_len; |
b3e2272c | 1012 | PACKET challenge; |
0f113f3e | 1013 | |
73999b62 MC |
1014 | if (!PACKET_get_net_2(pkt, &cipher_len) |
1015 | || !PACKET_get_net_2(pkt, &session_id_len) | |
1016 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1017 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1018 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1019 | al = SSL_AD_DECODE_ERROR; |
1020 | goto f_err; | |
5e9f0eeb | 1021 | } |
0f113f3e | 1022 | |
293b5ca4 AG |
1023 | if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
1024 | al = SSL_AD_DECODE_ERROR; | |
1025 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1026 | goto f_err; | |
1027 | } | |
1028 | ||
73999b62 MC |
1029 | if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len) |
1030 | || !PACKET_get_sub_packet(pkt, &session_id, session_id_len) | |
1031 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) | |
b3e2272c | 1032 | /* No extensions. */ |
73999b62 | 1033 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1034 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1035 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1036 | al = SSL_AD_DECODE_ERROR; |
1037 | goto f_err; | |
1038 | } | |
1039 | ||
cb21df32 | 1040 | /* Load the client random and compression list. */ |
b3e2272c EK |
1041 | challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE : |
1042 | challenge_len; | |
32ec4153 | 1043 | memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE); |
b3e2272c EK |
1044 | if (!PACKET_copy_bytes(&challenge, |
1045 | s->s3->client_random + SSL3_RANDOM_SIZE - | |
cb21df32 DB |
1046 | challenge_len, challenge_len) |
1047 | /* Advertise only null compression. */ | |
1048 | || !PACKET_buf_init(&compression, &null_compression, 1)) { | |
f0659bdb | 1049 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1050 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1051 | goto f_err; |
1052 | } | |
b3e2272c | 1053 | |
b3e2272c | 1054 | PACKET_null_init(&extensions); |
0f113f3e | 1055 | } else { |
b3e2272c | 1056 | /* Regular ClientHello. */ |
73999b62 MC |
1057 | if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE) |
1058 | || !PACKET_get_length_prefixed_1(pkt, &session_id)) { | |
9ceb2426 | 1059 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1060 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1061 | goto f_err; |
1062 | } | |
32ec4153 | 1063 | |
293b5ca4 AG |
1064 | if (PACKET_remaining(&session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
1065 | al = SSL_AD_DECODE_ERROR; | |
1066 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1067 | goto f_err; | |
1068 | } | |
1069 | ||
b3e2272c | 1070 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1071 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1072 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1073 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1074 | goto f_err; |
1075 | } | |
b3e2272c EK |
1076 | /* |
1077 | * If we require cookies and this ClientHello doesn't contain one, | |
1078 | * just return since we do not want to allocate any memory yet. | |
1079 | * So check cookie length... | |
1080 | */ | |
1081 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1082 | if (PACKET_remaining(&cookie) == 0) | |
32ec4153 | 1083 | return 1; |
b3e2272c | 1084 | } |
5e9f0eeb | 1085 | } |
0f113f3e | 1086 | |
73999b62 MC |
1087 | if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites) |
1088 | || !PACKET_get_length_prefixed_1(pkt, &compression)) { | |
b3e2272c | 1089 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1090 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
b3e2272c EK |
1091 | goto f_err; |
1092 | } | |
1093 | /* Could be empty. */ | |
73999b62 | 1094 | extensions = *pkt; |
b3e2272c EK |
1095 | } |
1096 | ||
1ed65871 DB |
1097 | if (SSL_IS_DTLS(s)) { |
1098 | /* Empty cookie was already handled above by returning early. */ | |
1099 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1100 | if (s->ctx->app_verify_cookie_cb != NULL) { | |
1101 | if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie), | |
1102 | PACKET_remaining(&cookie)) == 0) { | |
1103 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1104 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, | |
1105 | SSL_R_COOKIE_MISMATCH); | |
1106 | goto f_err; | |
1107 | /* else cookie verification succeeded */ | |
1108 | } | |
1109 | /* default verification */ | |
1110 | } else if (!PACKET_equal(&cookie, s->d1->cookie, | |
1111 | s->d1->cookie_len)) { | |
1112 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1113 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); | |
1114 | goto f_err; | |
1115 | } | |
1116 | s->d1->cookie_verified = 1; | |
1117 | } | |
1118 | if (s->method->version == DTLS_ANY_VERSION) { | |
1119 | protverr = ssl_choose_server_version(s); | |
1120 | if (protverr != 0) { | |
1121 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
1122 | s->version = s->client_version; | |
1123 | al = SSL_AD_PROTOCOL_VERSION; | |
1124 | goto f_err; | |
1125 | } | |
1126 | } | |
1127 | } | |
1128 | ||
b3e2272c EK |
1129 | s->hit = 0; |
1130 | ||
1131 | /* | |
1132 | * We don't allow resumption in a backwards compatible ClientHello. | |
1133 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1134 | * | |
1135 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1136 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1137 | * ignore resumption requests with flag | |
1138 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1139 | * than a change to default behavior so that applications relying on | |
1140 | * this for security won't even compile against older library versions). | |
1141 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1142 | * request renegotiation but not a new session (s->new_session remains | |
1143 | * unset): for servers, this essentially just means that the | |
1144 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1145 | * ignored. | |
1146 | */ | |
1147 | if (is_v2_record || | |
1148 | (s->new_session && | |
1149 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1150 | if (!ssl_get_new_session(s, 1)) | |
1151 | goto err; | |
1152 | } else { | |
1153 | i = ssl_get_prev_session(s, &extensions, &session_id); | |
0f113f3e | 1154 | /* |
b3e2272c EK |
1155 | * Only resume if the session's version matches the negotiated |
1156 | * version. | |
1157 | * RFC 5246 does not provide much useful advice on resumption | |
1158 | * with a different protocol version. It doesn't forbid it but | |
1159 | * the sanity of such behaviour would be questionable. | |
1160 | * In practice, clients do not accept a version mismatch and | |
1161 | * will abort the handshake with an error. | |
0f113f3e | 1162 | */ |
b3e2272c EK |
1163 | if (i == 1 && s->version == s->session->ssl_version) { |
1164 | /* previous session */ | |
1165 | s->hit = 1; | |
1166 | } else if (i == -1) { | |
1167 | goto err; | |
32ec4153 | 1168 | } else { |
b3e2272c EK |
1169 | /* i == 0 */ |
1170 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1171 | goto err; |
0f113f3e | 1172 | } |
b3e2272c | 1173 | } |
0f113f3e | 1174 | |
38a3cbfb EK |
1175 | if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers), |
1176 | is_v2_record, &al) == NULL) { | |
b3e2272c EK |
1177 | goto f_err; |
1178 | } | |
5e9f0eeb | 1179 | |
b3e2272c EK |
1180 | /* If it is a hit, check that the cipher is in the list */ |
1181 | if (s->hit) { | |
1182 | j = 0; | |
1183 | id = s->session->cipher->id; | |
d02b48c6 | 1184 | |
413c4f45 | 1185 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1186 | fprintf(stderr, "client sent %d ciphers\n", |
1187 | sk_SSL_CIPHER_num(ciphers)); | |
413c4f45 | 1188 | #endif |
b3e2272c EK |
1189 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1190 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1191 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1192 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1193 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1194 | #endif |
b3e2272c EK |
1195 | if (c->id == id) { |
1196 | j = 1; | |
1197 | break; | |
32ec4153 | 1198 | } |
0f113f3e | 1199 | } |
b3e2272c | 1200 | if (j == 0) { |
ec30e856 | 1201 | /* |
b3e2272c EK |
1202 | * we need to have the cipher in the cipher list if we are asked |
1203 | * to reuse it | |
ec30e856 | 1204 | */ |
b3e2272c | 1205 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1206 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1207 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1208 | goto f_err; |
1209 | } | |
b3e2272c | 1210 | } |
9ceb2426 | 1211 | |
b3e2272c EK |
1212 | complen = PACKET_remaining(&compression); |
1213 | for (j = 0; j < complen; j++) { | |
1214 | if (PACKET_data(&compression)[j] == 0) | |
1215 | break; | |
0f113f3e | 1216 | } |
32ec4153 | 1217 | |
b3e2272c EK |
1218 | if (j >= complen) { |
1219 | /* no compress */ | |
1220 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1221 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1222 | goto f_err; |
1223 | } | |
f100b031 | 1224 | |
0f113f3e MC |
1225 | /* TLS extensions */ |
1226 | if (s->version >= SSL3_VERSION) { | |
b3e2272c | 1227 | if (!ssl_parse_clienthello_tlsext(s, &extensions)) { |
f0659bdb | 1228 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
0f113f3e MC |
1229 | goto err; |
1230 | } | |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * Check if we want to use external pre-shared secret for this handshake | |
1235 | * for not reused session only. We need to generate server_random before | |
1236 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1237 | * processing to use it in key derivation. | |
1238 | */ | |
1239 | { | |
1240 | unsigned char *pos; | |
1241 | pos = s->s3->server_random; | |
1242 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1243 | goto f_err; | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
4a640fb6 | 1248 | const SSL_CIPHER *pref_cipher = NULL; |
0f113f3e MC |
1249 | |
1250 | s->session->master_key_length = sizeof(s->session->master_key); | |
1251 | if (s->tls_session_secret_cb(s, s->session->master_key, | |
1252 | &s->session->master_key_length, ciphers, | |
1253 | &pref_cipher, | |
1254 | s->tls_session_secret_cb_arg)) { | |
1255 | s->hit = 1; | |
1256 | s->session->ciphers = ciphers; | |
1257 | s->session->verify_result = X509_V_OK; | |
1258 | ||
1259 | ciphers = NULL; | |
1260 | ||
1261 | /* check if some cipher was preferred by call back */ | |
1262 | pref_cipher = | |
1263 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1264 | s-> | |
1265 | session->ciphers, | |
1266 | SSL_get_ciphers | |
1267 | (s)); | |
1268 | if (pref_cipher == NULL) { | |
1269 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1270 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1271 | goto f_err; |
1272 | } | |
1273 | ||
1274 | s->session->cipher = pref_cipher; | |
25aaa98a | 1275 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1276 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1277 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1278 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1279 | } | |
1280 | } | |
58ece833 | 1281 | |
0f113f3e MC |
1282 | /* |
1283 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1284 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1285 | * algorithms from the client, starting at q. |
1286 | */ | |
1287 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1288 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1289 | /* This only happens if we have a cache hit */ |
1290 | if (s->session->compress_meth != 0) { | |
1291 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1292 | unsigned int k; |
0f113f3e MC |
1293 | /* Perform sanity checks on resumed compression algorithm */ |
1294 | /* Can't disable compression */ | |
1295 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1296 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1297 | SSL_R_INCONSISTENT_COMPRESSION); |
1298 | goto f_err; | |
1299 | } | |
1300 | /* Look for resumed compression method */ | |
1301 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1302 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1303 | if (comp_id == comp->id) { | |
1304 | s->s3->tmp.new_compression = comp; | |
1305 | break; | |
1306 | } | |
1307 | } | |
1308 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1309 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1310 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1311 | goto f_err; | |
1312 | } | |
1313 | /* Look for resumed method in compression list */ | |
9ceb2426 | 1314 | for (k = 0; k < complen; k++) { |
ec30e856 | 1315 | if (PACKET_data(&compression)[k] == comp_id) |
0f113f3e MC |
1316 | break; |
1317 | } | |
9ceb2426 | 1318 | if (k >= complen) { |
0f113f3e | 1319 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1320 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
8fdc99cb | 1321 | SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING); |
0f113f3e MC |
1322 | goto f_err; |
1323 | } | |
1324 | } else if (s->hit) | |
1325 | comp = NULL; | |
1326 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1327 | /* See if we have a match */ |
9ceb2426 MC |
1328 | int m, nn, v, done = 0; |
1329 | unsigned int o; | |
0f113f3e MC |
1330 | |
1331 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1332 | for (m = 0; m < nn; m++) { | |
1333 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1334 | v = comp->id; | |
b2ce0337 | 1335 | for (o = 0; o < complen; o++) { |
ec30e856 | 1336 | if (v == PACKET_data(&compression)[o]) { |
0f113f3e MC |
1337 | done = 1; |
1338 | break; | |
1339 | } | |
1340 | } | |
1341 | if (done) | |
1342 | break; | |
1343 | } | |
1344 | if (done) | |
1345 | s->s3->tmp.new_compression = comp; | |
1346 | else | |
1347 | comp = NULL; | |
1348 | } | |
e6f418bc | 1349 | #else |
0f113f3e MC |
1350 | /* |
1351 | * If compression is disabled we'd better not try to resume a session | |
1352 | * using compression. | |
1353 | */ | |
1354 | if (s->session->compress_meth != 0) { | |
e27f234a | 1355 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1356 | goto f_err; |
1357 | } | |
09b6c2ef | 1358 | #endif |
413c4f45 | 1359 | |
0f113f3e MC |
1360 | /* |
1361 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1362 | */ | |
d02b48c6 | 1363 | |
0f113f3e | 1364 | if (!s->hit) { |
09b6c2ef | 1365 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1366 | s->session->compress_meth = 0; |
09b6c2ef | 1367 | #else |
0f113f3e | 1368 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1369 | #endif |
25aaa98a | 1370 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1371 | s->session->ciphers = ciphers; |
1372 | if (ciphers == NULL) { | |
3ae91cfb | 1373 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1374 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1375 | goto f_err; |
1376 | } | |
1377 | ciphers = NULL; | |
1378 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1379 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1380 | goto err; |
1381 | } | |
e27f234a MC |
1382 | } |
1383 | ||
1384 | sk_SSL_CIPHER_free(ciphers); | |
1385 | return MSG_PROCESS_CONTINUE_PROCESSING; | |
1386 | f_err: | |
1387 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1388 | err: | |
fe3a3291 | 1389 | ossl_statem_set_error(s); |
e27f234a MC |
1390 | |
1391 | sk_SSL_CIPHER_free(ciphers); | |
1392 | return MSG_PROCESS_ERROR; | |
1393 | ||
1394 | } | |
1395 | ||
be3583fa | 1396 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1397 | { |
d13dd4be | 1398 | int al = SSL_AD_HANDSHAKE_FAILURE; |
4a640fb6 | 1399 | const SSL_CIPHER *cipher; |
e27f234a MC |
1400 | |
1401 | if (wst == WORK_MORE_A) { | |
1402 | if (!s->hit) { | |
1403 | /* Let cert callback update server certificates if required */ | |
1404 | if (s->cert->cert_cb) { | |
1405 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1406 | if (rv == 0) { | |
1407 | al = SSL_AD_INTERNAL_ERROR; | |
1408 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); | |
1409 | goto f_err; | |
1410 | } | |
1411 | if (rv < 0) { | |
1412 | s->rwstate = SSL_X509_LOOKUP; | |
1413 | return WORK_MORE_A; | |
1414 | } | |
1415 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1416 | } |
e27f234a MC |
1417 | cipher = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); |
1418 | ||
1419 | if (cipher == NULL) { | |
e27f234a MC |
1420 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
1421 | goto f_err; | |
0f113f3e | 1422 | } |
e27f234a MC |
1423 | s->s3->tmp.new_cipher = cipher; |
1424 | /* check whether we should disable session resumption */ | |
1425 | if (s->not_resumable_session_cb != NULL) | |
1426 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
1427 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); | |
1428 | if (s->session->not_resumable) | |
1429 | /* do not send a session ticket */ | |
1430 | s->tlsext_ticket_expected = 0; | |
1431 | } else { | |
1432 | /* Session-id reuse */ | |
1433 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1434 | } |
0f113f3e | 1435 | |
28f4580c | 1436 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1437 | if (!ssl3_digest_cached_records(s, 0)) { |
1438 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1439 | goto f_err; |
d13dd4be | 1440 | } |
0f113f3e | 1441 | } |
0f113f3e | 1442 | |
e27f234a MC |
1443 | /*- |
1444 | * we now have the following setup. | |
1445 | * client_random | |
1446 | * cipher_list - our prefered list of ciphers | |
1447 | * ciphers - the clients prefered list of ciphers | |
1448 | * compression - basically ignored right now | |
1449 | * ssl version is set - sslv3 | |
1450 | * s->session - The ssl session has been setup. | |
1451 | * s->hit - session reuse flag | |
1452 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1453 | */ | |
0f113f3e | 1454 | |
e27f234a MC |
1455 | /* Handles TLS extensions that we couldn't check earlier */ |
1456 | if (s->version >= SSL3_VERSION) { | |
1457 | if (ssl_check_clienthello_tlsext_late(s) <= 0) { | |
d13dd4be MC |
1458 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1459 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1460 | goto f_err; |
1461 | } | |
1462 | } | |
0f113f3e | 1463 | |
e27f234a MC |
1464 | wst = WORK_MORE_B; |
1465 | } | |
1466 | #ifndef OPENSSL_NO_SRP | |
1467 | if (wst == WORK_MORE_B) { | |
1468 | int ret; | |
1469 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1470 | /* | |
1471 | * callback indicates further work to be done | |
1472 | */ | |
1473 | s->rwstate = SSL_X509_LOOKUP; | |
1474 | return WORK_MORE_B; | |
1475 | } | |
1476 | if (ret != SSL_ERROR_NONE) { | |
1477 | /* | |
1478 | * This is not really an error but the only means to for | |
1479 | * a client to detect whether srp is supported. | |
1480 | */ | |
1481 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1482 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1483 | SSL_R_CLIENTHELLO_TLSEXT); | |
1484 | goto f_err; | |
0f113f3e MC |
1485 | } |
1486 | } | |
e27f234a MC |
1487 | #endif |
1488 | s->renegotiate = 2; | |
0f113f3e | 1489 | |
e27f234a | 1490 | return WORK_FINISHED_STOP; |
0f113f3e | 1491 | f_err: |
e27f234a | 1492 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1493 | ossl_statem_set_error(s); |
e27f234a MC |
1494 | return WORK_ERROR; |
1495 | } | |
1496 | ||
e27f234a | 1497 | int tls_construct_server_hello(SSL *s) |
0f113f3e MC |
1498 | { |
1499 | unsigned char *buf; | |
1500 | unsigned char *p, *d; | |
1501 | int i, sl; | |
1502 | int al = 0; | |
1503 | unsigned long l; | |
1504 | ||
e27f234a | 1505 | buf = (unsigned char *)s->init_buf->data; |
e481f9b9 | 1506 | |
e27f234a MC |
1507 | /* Do the message type and length last */ |
1508 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1509 | |
e27f234a MC |
1510 | *(p++) = s->version >> 8; |
1511 | *(p++) = s->version & 0xff; | |
0f113f3e | 1512 | |
e27f234a MC |
1513 | /* |
1514 | * Random stuff. Filling of the server_random takes place in | |
1515 | * tls_process_client_hello() | |
1516 | */ | |
1517 | memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); | |
1518 | p += SSL3_RANDOM_SIZE; | |
0f113f3e | 1519 | |
e27f234a MC |
1520 | /*- |
1521 | * There are several cases for the session ID to send | |
1522 | * back in the server hello: | |
1523 | * - For session reuse from the session cache, | |
1524 | * we send back the old session ID. | |
1525 | * - If stateless session reuse (using a session ticket) | |
1526 | * is successful, we send back the client's "session ID" | |
1527 | * (which doesn't actually identify the session). | |
1528 | * - If it is a new session, we send back the new | |
1529 | * session ID. | |
1530 | * - However, if we want the new session to be single-use, | |
1531 | * we send back a 0-length session ID. | |
1532 | * s->hit is non-zero in either case of session reuse, | |
1533 | * so the following won't overwrite an ID that we're supposed | |
1534 | * to send back. | |
1535 | */ | |
1536 | if (s->session->not_resumable || | |
1537 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1538 | && !s->hit)) | |
1539 | s->session->session_id_length = 0; | |
1540 | ||
1541 | sl = s->session->session_id_length; | |
1542 | if (sl > (int)sizeof(s->session->session_id)) { | |
1543 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1544 | ossl_statem_set_error(s); |
e27f234a MC |
1545 | return 0; |
1546 | } | |
1547 | *(p++) = sl; | |
1548 | memcpy(p, s->session->session_id, sl); | |
1549 | p += sl; | |
0f113f3e | 1550 | |
e27f234a MC |
1551 | /* put the cipher */ |
1552 | i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); | |
1553 | p += i; | |
0f113f3e | 1554 | |
e27f234a | 1555 | /* put the compression method */ |
09b6c2ef | 1556 | #ifdef OPENSSL_NO_COMP |
e27f234a | 1557 | *(p++) = 0; |
09b6c2ef | 1558 | #else |
e27f234a MC |
1559 | if (s->s3->tmp.new_compression == NULL) |
1560 | *(p++) = 0; | |
1561 | else | |
1562 | *(p++) = s->s3->tmp.new_compression->id; | |
09b6c2ef | 1563 | #endif |
e481f9b9 | 1564 | |
e27f234a MC |
1565 | if (ssl_prepare_serverhello_tlsext(s) <= 0) { |
1566 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); | |
fe3a3291 | 1567 | ossl_statem_set_error(s); |
e27f234a MC |
1568 | return 0; |
1569 | } | |
1570 | if ((p = | |
1571 | ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, | |
1572 | &al)) == NULL) { | |
1573 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1574 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1575 | ossl_statem_set_error(s); |
e27f234a MC |
1576 | return 0; |
1577 | } | |
e481f9b9 | 1578 | |
e27f234a MC |
1579 | /* do the header */ |
1580 | l = (p - d); | |
1581 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) { | |
1582 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1583 | ossl_statem_set_error(s); |
e27f234a | 1584 | return 0; |
0f113f3e | 1585 | } |
d02b48c6 | 1586 | |
e27f234a | 1587 | return 1; |
0f113f3e | 1588 | } |
d02b48c6 | 1589 | |
e27f234a MC |
1590 | int tls_construct_server_done(SSL *s) |
1591 | { | |
1592 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) { | |
1593 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 1594 | ossl_statem_set_error(s); |
e27f234a MC |
1595 | return 0; |
1596 | } | |
1597 | ||
1598 | if (!s->s3->tmp.cert_request) { | |
1599 | if (!ssl3_digest_cached_records(s, 0)) { | |
fe3a3291 | 1600 | ossl_statem_set_error(s); |
e27f234a MC |
1601 | } |
1602 | } | |
1603 | ||
1604 | return 1; | |
1605 | } | |
1606 | ||
e27f234a | 1607 | int tls_construct_server_key_exchange(SSL *s) |
0f113f3e | 1608 | { |
bc36ee62 | 1609 | #ifndef OPENSSL_NO_DH |
e2b420fd | 1610 | EVP_PKEY *pkdh = NULL; |
ea262260 | 1611 | #endif |
10bf4fc2 | 1612 | #ifndef OPENSSL_NO_EC |
0f113f3e MC |
1613 | unsigned char *encodedPoint = NULL; |
1614 | int encodedlen = 0; | |
1615 | int curve_id = 0; | |
d02b48c6 | 1616 | #endif |
0f113f3e MC |
1617 | EVP_PKEY *pkey; |
1618 | const EVP_MD *md = NULL; | |
1619 | unsigned char *p, *d; | |
1620 | int al, i; | |
1621 | unsigned long type; | |
1622 | int n; | |
2ac6115d | 1623 | const BIGNUM *r[4]; |
0f113f3e MC |
1624 | int nr[4], kn; |
1625 | BUF_MEM *buf; | |
bfb0641f | 1626 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
0f113f3e | 1627 | |
6e59a892 RL |
1628 | if (md_ctx == NULL) { |
1629 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
1630 | al = SSL_AD_INTERNAL_ERROR; | |
1631 | goto f_err; | |
1632 | } | |
0f113f3e | 1633 | |
e27f234a | 1634 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a MC |
1635 | |
1636 | buf = s->init_buf; | |
0f113f3e | 1637 | |
e27f234a MC |
1638 | r[0] = r[1] = r[2] = r[3] = NULL; |
1639 | n = 0; | |
85269210 | 1640 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1641 | if (type & SSL_PSK) { |
1642 | /* | |
1643 | * reserve size for record length and PSK identity hint | |
1644 | */ | |
1645 | n += 2; | |
1646 | if (s->cert->psk_identity_hint) | |
1647 | n += strlen(s->cert->psk_identity_hint); | |
1648 | } | |
1649 | /* Plain PSK or RSAPSK nothing to do */ | |
1650 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1651 | } else | |
85269210 | 1652 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1653 | #ifndef OPENSSL_NO_DH |
e27f234a | 1654 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
1655 | CERT *cert = s->cert; |
1656 | ||
e2b420fd DSH |
1657 | EVP_PKEY *pkdhp = NULL; |
1658 | DH *dh; | |
1659 | ||
e27f234a | 1660 | if (s->cert->dh_tmp_auto) { |
e2b420fd DSH |
1661 | DH *dhp = ssl_get_auto_dh(s); |
1662 | pkdh = EVP_PKEY_new(); | |
1663 | if (pkdh == NULL || dhp == NULL) { | |
1664 | DH_free(dhp); | |
e27f234a MC |
1665 | al = SSL_AD_INTERNAL_ERROR; |
1666 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
0f113f3e | 1667 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1668 | goto f_err; |
0f113f3e | 1669 | } |
e2b420fd DSH |
1670 | EVP_PKEY_assign_DH(pkdh, dhp); |
1671 | pkdhp = pkdh; | |
1672 | } else { | |
1673 | pkdhp = cert->dh_tmp; | |
1674 | } | |
1675 | if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { | |
1676 | DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); | |
1677 | pkdh = ssl_dh_to_pkey(dhp); | |
1678 | if (pkdh == NULL) { | |
1679 | al = SSL_AD_INTERNAL_ERROR; | |
1680 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1681 | ERR_R_INTERNAL_ERROR); | |
1682 | goto f_err; | |
1683 | } | |
1684 | pkdhp = pkdh; | |
1685 | } | |
1686 | if (pkdhp == NULL) { | |
e27f234a MC |
1687 | al = SSL_AD_HANDSHAKE_FAILURE; |
1688 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1689 | SSL_R_MISSING_TMP_DH_KEY); | |
1690 | goto f_err; | |
1691 | } | |
1692 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
e2b420fd | 1693 | EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { |
e27f234a MC |
1694 | al = SSL_AD_HANDSHAKE_FAILURE; |
1695 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1696 | SSL_R_DH_KEY_TOO_SMALL); | |
1697 | goto f_err; | |
1698 | } | |
e2b420fd | 1699 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1700 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1701 | ERR_R_INTERNAL_ERROR); | |
1702 | goto err; | |
1703 | } | |
0f113f3e | 1704 | |
e2b420fd | 1705 | s->s3->tmp.pkey = ssl_generate_pkey(pkdhp, NID_undef); |
e27f234a | 1706 | |
e2b420fd DSH |
1707 | if (s->s3->tmp.pkey == NULL) { |
1708 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
ffaef3f1 | 1709 | goto err; |
e27f234a | 1710 | } |
e2b420fd DSH |
1711 | |
1712 | dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); | |
1713 | ||
1714 | EVP_PKEY_free(pkdh); | |
1715 | pkdh = NULL; | |
1716 | ||
0aeddcfa MC |
1717 | DH_get0_pqg(dh, &r[0], NULL, &r[1]); |
1718 | DH_get0_key(dh, &r[2], NULL); | |
e27f234a | 1719 | } else |
d02b48c6 | 1720 | #endif |
10bf4fc2 | 1721 | #ifndef OPENSSL_NO_EC |
e27f234a | 1722 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 1723 | int nid; |
e27f234a | 1724 | |
880d9d86 | 1725 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1726 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1727 | ERR_R_INTERNAL_ERROR); | |
1728 | goto err; | |
1729 | } | |
1730 | ||
57be4444 DSH |
1731 | /* Get NID of appropriate shared curve */ |
1732 | nid = tls1_shared_curve(s, -2); | |
1733 | curve_id = tls1_ec_nid2curve_id(nid); | |
1734 | if (curve_id == 0) { | |
e27f234a MC |
1735 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1736 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1737 | goto err; | |
1738 | } | |
880d9d86 DSH |
1739 | s->s3->tmp.pkey = ssl_generate_pkey(NULL, nid); |
1740 | /* Generate a new key for this curve */ | |
1741 | if (s->s3->tmp.pkey == NULL) { | |
57be4444 | 1742 | al = SSL_AD_INTERNAL_ERROR; |
880d9d86 | 1743 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
1744 | goto f_err; |
1745 | } | |
1746 | ||
880d9d86 DSH |
1747 | /* Encode the public key. */ |
1748 | encodedlen = EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(s->s3->tmp.pkey), | |
1749 | POINT_CONVERSION_UNCOMPRESSED, | |
cae41364 | 1750 | &encodedPoint, NULL); |
0f113f3e | 1751 | |
e27f234a | 1752 | if (encodedlen == 0) { |
cae41364 | 1753 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
1754 | goto err; |
1755 | } | |
0f113f3e | 1756 | |
e27f234a | 1757 | /* |
57be4444 DSH |
1758 | * We only support named (not generic) curves in ECDH ephemeral key |
1759 | * exchanges. In this situation, we need four additional bytes to | |
1760 | * encode the entire ServerECDHParams structure. | |
e27f234a MC |
1761 | */ |
1762 | n += 4 + encodedlen; | |
0f113f3e | 1763 | |
e27f234a MC |
1764 | /* |
1765 | * We'll generate the serverKeyExchange message explicitly so we | |
1766 | * can set these to NULLs | |
1767 | */ | |
1768 | r[0] = NULL; | |
1769 | r[1] = NULL; | |
1770 | r[2] = NULL; | |
1771 | r[3] = NULL; | |
1772 | } else | |
10bf4fc2 | 1773 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1774 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1775 | if (type & SSL_kSRP) { |
1776 | if ((s->srp_ctx.N == NULL) || | |
1777 | (s->srp_ctx.g == NULL) || | |
1778 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1779 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1780 | SSL_R_MISSING_SRP_PARAM); | |
1781 | goto err; | |
0f113f3e | 1782 | } |
e27f234a MC |
1783 | r[0] = s->srp_ctx.N; |
1784 | r[1] = s->srp_ctx.g; | |
1785 | r[2] = s->srp_ctx.s; | |
1786 | r[3] = s->srp_ctx.B; | |
1787 | } else | |
1788 | #endif | |
1789 | { | |
1790 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1791 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1792 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1793 | goto f_err; | |
1794 | } | |
1795 | for (i = 0; i < 4 && r[i] != NULL; i++) { | |
1796 | nr[i] = BN_num_bytes(r[i]); | |
edc032b5 | 1797 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1798 | if ((i == 2) && (type & SSL_kSRP)) |
1799 | n += 1 + nr[i]; | |
1800 | else | |
edc032b5 | 1801 | #endif |
e27f234a MC |
1802 | n += 2 + nr[i]; |
1803 | } | |
0f113f3e | 1804 | |
e27f234a MC |
1805 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) |
1806 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { | |
1807 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1808 | == NULL) { | |
1809 | al = SSL_AD_DECODE_ERROR; | |
1810 | goto f_err; | |
0f113f3e | 1811 | } |
e27f234a | 1812 | kn = EVP_PKEY_size(pkey); |
1e16987f MC |
1813 | /* Allow space for signature algorithm */ |
1814 | if (SSL_USE_SIGALGS(s)) | |
1815 | kn += 2; | |
1816 | /* Allow space for signature length */ | |
1817 | kn += 2; | |
e27f234a MC |
1818 | } else { |
1819 | pkey = NULL; | |
1820 | kn = 0; | |
1821 | } | |
0f113f3e | 1822 | |
e27f234a MC |
1823 | if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) { |
1824 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); | |
1825 | goto err; | |
1826 | } | |
1827 | d = p = ssl_handshake_start(s); | |
0f113f3e | 1828 | |
85269210 | 1829 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1830 | if (type & SSL_PSK) { |
1831 | /* copy PSK identity hint */ | |
1832 | if (s->cert->psk_identity_hint) { | |
1833 | s2n(strlen(s->cert->psk_identity_hint), p); | |
1834 | strncpy((char *)p, s->cert->psk_identity_hint, | |
1835 | strlen(s->cert->psk_identity_hint)); | |
1836 | p += strlen(s->cert->psk_identity_hint); | |
1837 | } else { | |
1838 | s2n(0, p); | |
85269210 | 1839 | } |
e27f234a | 1840 | } |
85269210 DSH |
1841 | #endif |
1842 | ||
e27f234a | 1843 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
edc032b5 | 1844 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1845 | if ((i == 2) && (type & SSL_kSRP)) { |
1846 | *p = nr[i]; | |
1847 | p++; | |
1848 | } else | |
edc032b5 | 1849 | #endif |
e27f234a MC |
1850 | s2n(nr[i], p); |
1851 | BN_bn2bin(r[i], p); | |
1852 | p += nr[i]; | |
1853 | } | |
d02b48c6 | 1854 | |
10bf4fc2 | 1855 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1856 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1857 | /* | |
1858 | * XXX: For now, we only support named (not generic) curves. In | |
1859 | * this situation, the serverKeyExchange message has: [1 byte | |
1860 | * CurveType], [2 byte CurveName] [1 byte length of encoded | |
1861 | * point], followed by the actual encoded point itself | |
1862 | */ | |
1863 | *p = NAMED_CURVE_TYPE; | |
1864 | p += 1; | |
1865 | *p = 0; | |
1866 | p += 1; | |
1867 | *p = curve_id; | |
1868 | p += 1; | |
1869 | *p = encodedlen; | |
1870 | p += 1; | |
1871 | memcpy(p, encodedPoint, encodedlen); | |
1872 | OPENSSL_free(encodedPoint); | |
1873 | encodedPoint = NULL; | |
1874 | p += encodedlen; | |
1875 | } | |
ea262260 BM |
1876 | #endif |
1877 | ||
e27f234a MC |
1878 | /* not anonymous */ |
1879 | if (pkey != NULL) { | |
1880 | /* | |
1881 | * n is the length of the params, they start at &(d[4]) and p | |
1882 | * points to the space at the end. | |
1883 | */ | |
e27f234a MC |
1884 | if (md) { |
1885 | /* send signature algorithm */ | |
1886 | if (SSL_USE_SIGALGS(s)) { | |
1887 | if (!tls12_get_sigandhash(p, pkey, md)) { | |
1888 | /* Should never happen */ | |
1889 | al = SSL_AD_INTERNAL_ERROR; | |
1890 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1891 | ERR_R_INTERNAL_ERROR); | |
1892 | goto f_err; | |
0f113f3e | 1893 | } |
e27f234a MC |
1894 | p += 2; |
1895 | } | |
a2f9200f | 1896 | #ifdef SSL_DEBUG |
e27f234a | 1897 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 1898 | #endif |
6e59a892 RL |
1899 | if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0 |
1900 | || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]), | |
5f3d93e4 | 1901 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 | 1902 | || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]), |
5f3d93e4 | 1903 | SSL3_RANDOM_SIZE) <= 0 |
6e59a892 RL |
1904 | || EVP_SignUpdate(md_ctx, d, n) <= 0 |
1905 | || EVP_SignFinal(md_ctx, &(p[2]), | |
5f3d93e4 | 1906 | (unsigned int *)&i, pkey) <= 0) { |
e27f234a | 1907 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); |
5f3d93e4 MC |
1908 | al = SSL_AD_INTERNAL_ERROR; |
1909 | goto f_err; | |
0f113f3e | 1910 | } |
e27f234a MC |
1911 | s2n(i, p); |
1912 | n += i + 2; | |
1913 | if (SSL_USE_SIGALGS(s)) | |
1914 | n += 2; | |
1915 | } else { | |
1916 | /* Is this error check actually needed? */ | |
77d514c5 | 1917 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1918 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1919 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
1920 | goto f_err; |
1921 | } | |
0f113f3e MC |
1922 | } |
1923 | ||
e27f234a MC |
1924 | if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) { |
1925 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1926 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
1927 | goto f_err; | |
1928 | } | |
1929 | ||
bfb0641f | 1930 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 1931 | return 1; |
0f113f3e MC |
1932 | f_err: |
1933 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1934 | err: | |
e2b420fd DSH |
1935 | #ifndef OPENSSL_NO_DH |
1936 | EVP_PKEY_free(pkdh); | |
1937 | #endif | |
556efe79 | 1938 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 1939 | OPENSSL_free(encodedPoint); |
ea262260 | 1940 | #endif |
bfb0641f | 1941 | EVP_MD_CTX_free(md_ctx); |
fe3a3291 | 1942 | ossl_statem_set_error(s); |
e27f234a | 1943 | return 0; |
0f113f3e | 1944 | } |
d02b48c6 | 1945 | |
e27f234a | 1946 | int tls_construct_certificate_request(SSL *s) |
0f113f3e MC |
1947 | { |
1948 | unsigned char *p, *d; | |
1949 | int i, j, nl, off, n; | |
1950 | STACK_OF(X509_NAME) *sk = NULL; | |
1951 | X509_NAME *name; | |
1952 | BUF_MEM *buf; | |
1953 | ||
e27f234a | 1954 | buf = s->init_buf; |
0f113f3e | 1955 | |
e27f234a | 1956 | d = p = ssl_handshake_start(s); |
0f113f3e | 1957 | |
e27f234a MC |
1958 | /* get the list of acceptable cert types */ |
1959 | p++; | |
1960 | n = ssl3_get_req_cert_type(s, p); | |
1961 | d[0] = n; | |
1962 | p += n; | |
1963 | n++; | |
0f113f3e | 1964 | |
e27f234a MC |
1965 | if (SSL_USE_SIGALGS(s)) { |
1966 | const unsigned char *psigs; | |
1967 | unsigned char *etmp = p; | |
1968 | nl = tls12_get_psigalgs(s, &psigs); | |
1969 | /* Skip over length for now */ | |
0f113f3e | 1970 | p += 2; |
e27f234a MC |
1971 | nl = tls12_copy_sigalgs(s, p, psigs, nl); |
1972 | /* Now fill in length */ | |
1973 | s2n(nl, etmp); | |
1974 | p += nl; | |
1975 | n += nl + 2; | |
1976 | } | |
0f113f3e | 1977 | |
e27f234a MC |
1978 | off = n; |
1979 | p += 2; | |
1980 | n += 2; | |
1981 | ||
1982 | sk = SSL_get_client_CA_list(s); | |
1983 | nl = 0; | |
1984 | if (sk != NULL) { | |
1985 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
1986 | name = sk_X509_NAME_value(sk, i); | |
1987 | j = i2d_X509_NAME(name, NULL); | |
1988 | if (!BUF_MEM_grow_clean | |
1989 | (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { | |
1990 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
1991 | ERR_R_BUF_LIB); | |
1992 | goto err; | |
0f113f3e | 1993 | } |
e27f234a MC |
1994 | p = ssl_handshake_start(s) + n; |
1995 | s2n(j, p); | |
1996 | i2d_X509_NAME(name, &p); | |
1997 | n += 2 + j; | |
1998 | nl += 2 + j; | |
0f113f3e | 1999 | } |
e27f234a MC |
2000 | } |
2001 | /* else no CA names */ | |
2002 | p = ssl_handshake_start(s) + off; | |
2003 | s2n(nl, p); | |
d02b48c6 | 2004 | |
e27f234a MC |
2005 | if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) { |
2006 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); | |
2007 | goto err; | |
0f113f3e | 2008 | } |
d02b48c6 | 2009 | |
e27f234a MC |
2010 | s->s3->tmp.cert_request = 1; |
2011 | ||
2012 | return 1; | |
0f113f3e | 2013 | err: |
fe3a3291 | 2014 | ossl_statem_set_error(s); |
e27f234a | 2015 | return 0; |
0f113f3e | 2016 | } |
d02b48c6 | 2017 | |
0907d710 | 2018 | static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al) |
e27f234a | 2019 | { |
85269210 | 2020 | #ifndef OPENSSL_NO_PSK |
0907d710 MC |
2021 | unsigned char psk[PSK_MAX_PSK_LEN]; |
2022 | size_t psklen; | |
2023 | PACKET psk_identity; | |
efcdbcbe | 2024 | |
0907d710 MC |
2025 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
2026 | *al = SSL_AD_DECODE_ERROR; | |
2027 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); | |
2028 | return 0; | |
2029 | } | |
2030 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { | |
2031 | *al = SSL_AD_DECODE_ERROR; | |
2032 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2033 | SSL_R_DATA_LENGTH_TOO_LONG); | |
2034 | return 0; | |
2035 | } | |
2036 | if (s->psk_server_callback == NULL) { | |
2037 | *al = SSL_AD_INTERNAL_ERROR; | |
2038 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2039 | SSL_R_PSK_NO_SERVER_CB); | |
2040 | return 0; | |
2041 | } | |
85269210 | 2042 | |
0907d710 MC |
2043 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
2044 | *al = SSL_AD_INTERNAL_ERROR; | |
2045 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2046 | return 0; | |
2047 | } | |
85269210 | 2048 | |
0907d710 MC |
2049 | psklen = s->psk_server_callback(s, s->session->psk_identity, |
2050 | psk, sizeof(psk)); | |
85269210 | 2051 | |
0907d710 MC |
2052 | if (psklen > PSK_MAX_PSK_LEN) { |
2053 | *al = SSL_AD_INTERNAL_ERROR; | |
2054 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2055 | return 0; | |
2056 | } else if (psklen == 0) { | |
2057 | /* | |
2058 | * PSK related to the given identity not found | |
2059 | */ | |
2060 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
2061 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2062 | SSL_R_PSK_IDENTITY_NOT_FOUND); | |
2063 | return 0; | |
2064 | } | |
85269210 | 2065 | |
0907d710 MC |
2066 | OPENSSL_free(s->s3->tmp.psk); |
2067 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); | |
2068 | OPENSSL_cleanse(psk, psklen); | |
85269210 | 2069 | |
0907d710 MC |
2070 | if (s->s3->tmp.psk == NULL) { |
2071 | *al = SSL_AD_INTERNAL_ERROR; | |
2072 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2073 | return 0; | |
85269210 | 2074 | } |
0907d710 MC |
2075 | |
2076 | s->s3->tmp.psklen = psklen; | |
2077 | ||
2078 | return 1; | |
2079 | #else | |
2080 | /* Should never happen */ | |
2081 | *al = SSL_AD_INTERNAL_ERROR; | |
2082 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2083 | return 0; | |
85269210 | 2084 | #endif |
0907d710 MC |
2085 | } |
2086 | ||
2087 | ||
2088 | static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al) | |
2089 | { | |
bc36ee62 | 2090 | #ifndef OPENSSL_NO_RSA |
0907d710 MC |
2091 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2092 | int decrypt_len; | |
2093 | unsigned char decrypt_good, version_good; | |
2094 | size_t j, padding_len; | |
2095 | PACKET enc_premaster; | |
2096 | RSA *rsa = NULL; | |
2097 | unsigned char *rsa_decrypt = NULL; | |
2098 | int ret = 0; | |
2099 | ||
2100 | rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey); | |
2101 | if (rsa == NULL) { | |
2102 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2103 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2104 | SSL_R_MISSING_RSA_CERTIFICATE); | |
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ | |
2109 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
2110 | enc_premaster = *pkt; | |
2111 | } else { | |
2112 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) | |
2113 | || PACKET_remaining(pkt) != 0) { | |
2114 | *al = SSL_AD_DECODE_ERROR; | |
361a1191 | 2115 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
0907d710 MC |
2116 | SSL_R_LENGTH_MISMATCH); |
2117 | return 0; | |
0f113f3e | 2118 | } |
0907d710 | 2119 | } |
0f113f3e | 2120 | |
0907d710 MC |
2121 | /* |
2122 | * We want to be sure that the plaintext buffer size makes it safe to | |
2123 | * iterate over the entire size of a premaster secret | |
2124 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2125 | * their ciphertext cannot accommodate a premaster secret anyway. | |
2126 | */ | |
2127 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { | |
2128 | *al = SSL_AD_INTERNAL_ERROR; | |
2129 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2130 | RSA_R_KEY_SIZE_TOO_SMALL); | |
2131 | return 0; | |
2132 | } | |
0f113f3e | 2133 | |
0907d710 MC |
2134 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2135 | if (rsa_decrypt == NULL) { | |
2136 | *al = SSL_AD_INTERNAL_ERROR; | |
2137 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2138 | return 0; | |
2139 | } | |
0f113f3e | 2140 | |
0907d710 MC |
2141 | /* |
2142 | * We must not leak whether a decryption failure occurs because of | |
2143 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2144 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2145 | * generates a random premaster secret for the case that the decrypt | |
2146 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2147 | */ | |
20ca916d | 2148 | |
0907d710 MC |
2149 | if (RAND_bytes(rand_premaster_secret, |
2150 | sizeof(rand_premaster_secret)) <= 0) | |
2151 | goto err; | |
0f113f3e | 2152 | |
0907d710 MC |
2153 | /* |
2154 | * Decrypt with no padding. PKCS#1 padding will be removed as part of | |
2155 | * the timing-sensitive code below. | |
2156 | */ | |
2157 | decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster), | |
2158 | PACKET_data(&enc_premaster), | |
2159 | rsa_decrypt, rsa, RSA_NO_PADDING); | |
2160 | if (decrypt_len < 0) | |
2161 | goto err; | |
20ca916d | 2162 | |
0907d710 | 2163 | /* Check the padding. See RFC 3447, section 7.2.2. */ |
5b8fa431 | 2164 | |
0907d710 MC |
2165 | /* |
2166 | * The smallest padded premaster is 11 bytes of overhead. Small keys | |
2167 | * are publicly invalid, so this may return immediately. This ensures | |
2168 | * PS is at least 8 bytes. | |
2169 | */ | |
2170 | if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) { | |
2171 | *al = SSL_AD_DECRYPT_ERROR; | |
2172 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); | |
2173 | goto err; | |
2174 | } | |
0f113f3e | 2175 | |
0907d710 MC |
2176 | padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH; |
2177 | decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) & | |
2178 | constant_time_eq_int_8(rsa_decrypt[1], 2); | |
2179 | for (j = 2; j < padding_len - 1; j++) { | |
2180 | decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]); | |
2181 | } | |
2182 | decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]); | |
5b8fa431 | 2183 | |
0907d710 MC |
2184 | /* |
2185 | * If the version in the decrypted pre-master secret is correct then | |
2186 | * version_good will be 0xff, otherwise it'll be zero. The | |
2187 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2188 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2189 | * check as a "bad version oracle". Thus version checks are done in | |
2190 | * constant time and are treated like any other decryption error. | |
2191 | */ | |
2192 | version_good = | |
2193 | constant_time_eq_8(rsa_decrypt[padding_len], | |
2194 | (unsigned)(s->client_version >> 8)); | |
2195 | version_good &= | |
2196 | constant_time_eq_8(rsa_decrypt[padding_len + 1], | |
2197 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e | 2198 | |
0907d710 MC |
2199 | /* |
2200 | * The premaster secret must contain the same version number as the | |
2201 | * ClientHello to detect version rollback attacks (strangely, the | |
2202 | * protocol does not offer such protection for DH ciphersuites). | |
2203 | * However, buggy clients exist that send the negotiated protocol | |
2204 | * version instead if the server does not support the requested | |
2205 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2206 | * clients. | |
2207 | */ | |
2208 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2209 | unsigned char workaround_good; | |
2210 | workaround_good = constant_time_eq_8(rsa_decrypt[padding_len], | |
2211 | (unsigned)(s->version >> 8)); | |
2212 | workaround_good &= | |
5b8fa431 | 2213 | constant_time_eq_8(rsa_decrypt[padding_len + 1], |
0907d710 MC |
2214 | (unsigned)(s->version & 0xff)); |
2215 | version_good |= workaround_good; | |
2216 | } | |
0f113f3e | 2217 | |
0907d710 MC |
2218 | /* |
2219 | * Both decryption and version must be good for decrypt_good to | |
2220 | * remain non-zero (0xff). | |
2221 | */ | |
2222 | decrypt_good &= version_good; | |
0f113f3e | 2223 | |
0907d710 MC |
2224 | /* |
2225 | * Now copy rand_premaster_secret over from p using | |
2226 | * decrypt_good_mask. If decryption failed, then p does not | |
2227 | * contain valid plaintext, however, a check above guarantees | |
2228 | * it is still sufficiently large to read from. | |
2229 | */ | |
2230 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
2231 | rsa_decrypt[padding_len + j] = | |
2232 | constant_time_select_8(decrypt_good, | |
2233 | rsa_decrypt[padding_len + j], | |
2234 | rand_premaster_secret[j]); | |
2235 | } | |
0f113f3e | 2236 | |
0907d710 MC |
2237 | if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len, |
2238 | sizeof(rand_premaster_secret), 0)) { | |
2239 | *al = SSL_AD_INTERNAL_ERROR; | |
2240 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2241 | goto err; | |
2242 | } | |
0f113f3e | 2243 | |
0907d710 MC |
2244 | ret = 1; |
2245 | err: | |
2246 | OPENSSL_free(rsa_decrypt); | |
2247 | return ret; | |
2248 | #else | |
2249 | /* Should never happen */ | |
2250 | *al = SSL_AD_INTERNAL_ERROR; | |
2251 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2252 | return 0; | |
2253 | #endif | |
2254 | } | |
2255 | ||
642360f9 MC |
2256 | static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al) |
2257 | { | |
2258 | #ifndef OPENSSL_NO_DH | |
2259 | EVP_PKEY *skey = NULL; | |
2260 | DH *cdh; | |
2261 | unsigned int i; | |
2262 | BIGNUM *pub_key; | |
2263 | const unsigned char *data; | |
2264 | EVP_PKEY *ckey = NULL; | |
2265 | int ret = 0; | |
2266 | ||
2267 | if (!PACKET_get_net_2(pkt, &i)) { | |
2268 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2269 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2270 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); | |
2271 | goto err; | |
2272 | } | |
2273 | if (PACKET_remaining(pkt) != i) { | |
2274 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2275 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); | |
2276 | goto err; | |
2277 | } | |
2278 | skey = s->s3->tmp.pkey; | |
2279 | if (skey == NULL) { | |
2280 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2281 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2282 | SSL_R_MISSING_TMP_DH_KEY); | |
2283 | goto err; | |
2284 | } | |
2285 | ||
2286 | if (PACKET_remaining(pkt) == 0L) { | |
2287 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2288 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2289 | SSL_R_MISSING_TMP_DH_KEY); | |
2290 | goto err; | |
2291 | } | |
2292 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2293 | /* We already checked we have enough data */ | |
2294 | *al = SSL_AD_INTERNAL_ERROR; | |
2295 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2296 | ERR_R_INTERNAL_ERROR); | |
2297 | goto err; | |
2298 | } | |
2299 | ckey = EVP_PKEY_new(); | |
2300 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { | |
2301 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB); | |
2302 | goto err; | |
2303 | } | |
2304 | cdh = EVP_PKEY_get0_DH(ckey); | |
2305 | pub_key = BN_bin2bn(data, i, NULL); | |
2306 | ||
2307 | if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) { | |
2308 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2309 | if (pub_key != NULL) | |
2310 | BN_free(pub_key); | |
2311 | goto err; | |
2312 | } | |
2313 | ||
2314 | if (ssl_derive(s, skey, ckey) == 0) { | |
2315 | *al = SSL_AD_INTERNAL_ERROR; | |
2316 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2317 | goto err; | |
2318 | } | |
2319 | ||
2320 | ret = 1; | |
2321 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2322 | s->s3->tmp.pkey = NULL; | |
2323 | err: | |
2324 | EVP_PKEY_free(ckey); | |
2325 | return ret; | |
2326 | #else | |
2327 | /* Should never happen */ | |
2328 | *al = SSL_AD_INTERNAL_ERROR; | |
2329 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2330 | return 0; | |
2331 | #endif | |
2332 | } | |
2333 | ||
19ed1ec1 MC |
2334 | static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al) |
2335 | { | |
2336 | #ifndef OPENSSL_NO_EC | |
2337 | EVP_PKEY *skey = s->s3->tmp.pkey; | |
2338 | EVP_PKEY *ckey = NULL; | |
2339 | int ret = 0; | |
2340 | ||
2341 | if (PACKET_remaining(pkt) == 0L) { | |
2342 | /* We don't support ECDH client auth */ | |
2343 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
2344 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2345 | SSL_R_MISSING_TMP_ECDH_KEY); | |
2346 | goto err; | |
2347 | } else { | |
2348 | unsigned int i; | |
2349 | const unsigned char *data; | |
2350 | ||
2351 | /* | |
2352 | * Get client's public key from encoded point in the | |
2353 | * ClientKeyExchange message. | |
2354 | */ | |
2355 | ||
2356 | /* Get encoded point length */ | |
2357 | if (!PACKET_get_1(pkt, &i)) { | |
2358 | *al = SSL_AD_DECODE_ERROR; | |
2359 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2360 | SSL_R_LENGTH_MISMATCH); | |
2361 | goto err; | |
2362 | } | |
2363 | if (!PACKET_get_bytes(pkt, &data, i) | |
2364 | || PACKET_remaining(pkt) != 0) { | |
2365 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); | |
2366 | goto err; | |
2367 | } | |
2368 | ckey = EVP_PKEY_new(); | |
2369 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
2370 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
2371 | goto err; | |
2372 | } | |
2373 | if (EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(ckey), data, i, | |
2374 | NULL) == 0) { | |
2375 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); | |
2376 | goto err; | |
2377 | } | |
2378 | } | |
2379 | ||
2380 | if (ssl_derive(s, skey, ckey) == 0) { | |
2381 | *al = SSL_AD_INTERNAL_ERROR; | |
2382 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2383 | goto err; | |
2384 | } | |
2385 | ||
2386 | ret = 1; | |
2387 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2388 | s->s3->tmp.pkey = NULL; | |
2389 | err: | |
2390 | EVP_PKEY_free(ckey); | |
2391 | ||
2392 | return ret; | |
2393 | #else | |
2394 | /* Should never happen */ | |
2395 | *al = SSL_AD_INTERNAL_ERROR; | |
2396 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2397 | return 0; | |
2398 | #endif | |
2399 | } | |
2400 | ||
c437eef6 MC |
2401 | static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al) |
2402 | { | |
2403 | #ifndef OPENSSL_NO_SRP | |
2404 | unsigned int i; | |
2405 | const unsigned char *data; | |
2406 | ||
2407 | if (!PACKET_get_net_2(pkt, &i) | |
2408 | || !PACKET_get_bytes(pkt, &data, i)) { | |
2409 | *al = SSL_AD_DECODE_ERROR; | |
2410 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_BAD_SRP_A_LENGTH); | |
2411 | return 0; | |
2412 | } | |
2413 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { | |
2414 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB); | |
2415 | return 0; | |
2416 | } | |
2417 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 | |
2418 | || BN_is_zero(s->srp_ctx.A)) { | |
2419 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
2420 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2421 | SSL_R_BAD_SRP_PARAMETERS); | |
2422 | return 0; | |
2423 | } | |
2424 | OPENSSL_free(s->session->srp_username); | |
2425 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); | |
2426 | if (s->session->srp_username == NULL) { | |
2427 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | if (!srp_generate_server_master_secret(s)) { | |
2432 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2433 | return 0; | |
2434 | } | |
2435 | ||
2436 | return 1; | |
2437 | #else | |
2438 | /* Should never happen */ | |
2439 | *al = SSL_AD_INTERNAL_ERROR; | |
2440 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2441 | return 0; | |
2442 | #endif | |
2443 | } | |
2444 | ||
2445 | static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al) | |
2446 | { | |
2447 | #ifndef OPENSSL_NO_GOST | |
2448 | EVP_PKEY_CTX *pkey_ctx; | |
2449 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2450 | unsigned char premaster_secret[32]; | |
2451 | const unsigned char *start; | |
2452 | size_t outlen = 32, inlen; | |
2453 | unsigned long alg_a; | |
2454 | int Ttag, Tclass; | |
2455 | long Tlen; | |
2456 | long sess_key_len; | |
2457 | const unsigned char *data; | |
2458 | int ret = 0; | |
2459 | ||
2460 | /* Get our certificate private key */ | |
2461 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2462 | if (alg_a & SSL_aGOST12) { | |
2463 | /* | |
2464 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2465 | */ | |
2466 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2467 | if (pk == NULL) { | |
2468 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2469 | } | |
2470 | if (pk == NULL) { | |
2471 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2472 | } | |
2473 | } else if (alg_a & SSL_aGOST01) { | |
2474 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2475 | } | |
2476 | ||
2477 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
2478 | if (pkey_ctx == NULL) { | |
2479 | *al = SSL_AD_INTERNAL_ERROR; | |
2480 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
2481 | return 0; | |
2482 | } | |
2483 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { | |
2484 | *al = SSL_AD_INTERNAL_ERROR; | |
2485 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2486 | return 0; | |
2487 | } | |
2488 | /* | |
2489 | * If client certificate is present and is of the same type, maybe | |
2490 | * use it for key exchange. Don't mind errors from | |
2491 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2492 | * client certificate for authorization only. | |
2493 | */ | |
2494 | client_pub_pkey = X509_get0_pubkey(s->session->peer); | |
2495 | if (client_pub_pkey) { | |
2496 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2497 | ERR_clear_error(); | |
2498 | } | |
2499 | /* Decrypt session key */ | |
2500 | sess_key_len = PACKET_remaining(pkt); | |
2501 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
2502 | *al = SSL_AD_INTERNAL_ERROR; | |
2503 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2504 | goto err; | |
2505 | } | |
2506 | if (ASN1_get_object ((const unsigned char **)&data, &Tlen, &Ttag, | |
2507 | &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED | |
2508 | || Ttag != V_ASN1_SEQUENCE | |
2509 | || Tclass != V_ASN1_UNIVERSAL) { | |
2510 | *al = SSL_AD_DECODE_ERROR; | |
2511 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2512 | SSL_R_DECRYPTION_FAILED); | |
2513 | goto err; | |
2514 | } | |
2515 | start = data; | |
2516 | inlen = Tlen; | |
2517 | if (EVP_PKEY_decrypt | |
2518 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
2519 | *al = SSL_AD_DECODE_ERROR; | |
2520 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, | |
2521 | SSL_R_DECRYPTION_FAILED); | |
2522 | goto err; | |
2523 | } | |
2524 | /* Generate master secret */ | |
2525 | if (!ssl_generate_master_secret(s, premaster_secret, | |
2526 | sizeof(premaster_secret), 0)) { | |
2527 | *al = SSL_AD_INTERNAL_ERROR; | |
2528 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2529 | goto err; | |
2530 | } | |
2531 | /* Check if pubkey from client certificate was used */ | |
2532 | if (EVP_PKEY_CTX_ctrl | |
2533 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
2534 | s->statem.no_cert_verify = 1; | |
2535 | ||
2536 | ret = 1; | |
2537 | err: | |
2538 | EVP_PKEY_CTX_free(pkey_ctx); | |
2539 | return ret; | |
2540 | #else | |
2541 | /* Should never happen */ | |
2542 | *al = SSL_AD_INTERNAL_ERROR; | |
2543 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); | |
2544 | return 0; | |
2545 | #endif | |
2546 | } | |
2547 | ||
0907d710 MC |
2548 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
2549 | { | |
2550 | int al = -1; | |
2551 | unsigned long alg_k; | |
2552 | ||
2553 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
2554 | ||
2555 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2556 | if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al)) | |
2557 | goto err; | |
2558 | ||
2559 | if (alg_k & SSL_kPSK) { | |
2560 | /* Identity extracted earlier: should be nothing left */ | |
2561 | if (PACKET_remaining(pkt) != 0) { | |
2562 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2563 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH); | |
9059eb71 | 2564 | goto err; |
0907d710 MC |
2565 | } |
2566 | /* PSK handled by ssl_generate_master_secret */ | |
2567 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
69f68237 | 2568 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2569 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
9059eb71 | 2570 | goto err; |
69f68237 | 2571 | } |
0907d710 MC |
2572 | } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
2573 | if (!tls_process_cke_rsa(s, pkt, &al)) | |
2574 | goto err; | |
642360f9 MC |
2575 | } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
2576 | if (!tls_process_cke_dhe(s, pkt, &al)) | |
0f113f3e | 2577 | goto err; |
19ed1ec1 MC |
2578 | } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2579 | if (!tls_process_cke_ecdhe(s, pkt, &al)) | |
2580 | goto err; | |
c437eef6 MC |
2581 | } else if (alg_k & SSL_kSRP) { |
2582 | if (!tls_process_cke_srp(s, pkt, &al)) | |
0f113f3e | 2583 | goto err; |
c437eef6 MC |
2584 | } else if (alg_k & SSL_kGOST) { |
2585 | if (!tls_process_cke_gost(s, pkt, &al)) | |
0f113f3e | 2586 | goto err; |
c437eef6 | 2587 | } else { |
0f113f3e | 2588 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a | 2589 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); |
9059eb71 | 2590 | goto err; |
0f113f3e MC |
2591 | } |
2592 | ||
e27f234a | 2593 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2594 | err: |
0907d710 MC |
2595 | if (al != -1) |
2596 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
85269210 DSH |
2597 | #ifndef OPENSSL_NO_PSK |
2598 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2599 | s->s3->tmp.psk = NULL; | |
58964a49 | 2600 | #endif |
fe3a3291 | 2601 | ossl_statem_set_error(s); |
e27f234a | 2602 | return MSG_PROCESS_ERROR; |
0f113f3e | 2603 | } |
d02b48c6 | 2604 | |
be3583fa | 2605 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2606 | { |
94836de2 | 2607 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2608 | if (wst == WORK_MORE_A) { |
2609 | if (SSL_IS_DTLS(s)) { | |
2610 | unsigned char sctpauthkey[64]; | |
2611 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2612 | /* | |
2613 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2614 | * used. | |
2615 | */ | |
141eb8c6 MC |
2616 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2617 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2618 | |
2619 | if (SSL_export_keying_material(s, sctpauthkey, | |
2620 | sizeof(sctpauthkey), labelbuffer, | |
2621 | sizeof(labelbuffer), NULL, 0, 0) <= 0) { | |
fe3a3291 | 2622 | ossl_statem_set_error(s); |
c130dd8e MC |
2623 | return WORK_ERROR;; |
2624 | } | |
94836de2 | 2625 | |
c130dd8e MC |
2626 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2627 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2628 | } |
c130dd8e MC |
2629 | wst = WORK_MORE_B; |
2630 | } | |
94836de2 | 2631 | |
c130dd8e MC |
2632 | if ((wst == WORK_MORE_B) |
2633 | /* Is this SCTP? */ | |
2634 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2635 | /* Are we renegotiating? */ | |
2636 | && s->renegotiate | |
2637 | /* Are we going to skip the CertificateVerify? */ | |
a71a4966 | 2638 | && (s->session->peer == NULL || s->statem.no_cert_verify) |
c130dd8e MC |
2639 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { |
2640 | s->s3->in_read_app_data = 2; | |
2641 | s->rwstate = SSL_READING; | |
2642 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2643 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2644 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2645 | return WORK_MORE_B; |
2646 | } else { | |
fe3a3291 | 2647 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2648 | } |
2649 | #endif | |
2650 | ||
149c2ef5 MC |
2651 | if (s->statem.no_cert_verify || !s->session->peer) { |
2652 | /* No certificate verify or no peer certificate so we no longer need the | |
2653 | * handshake_buffer | |
2654 | */ | |
2655 | if (!ssl3_digest_cached_records(s, 0)) { | |
2656 | ossl_statem_set_error(s); | |
2657 | return WORK_ERROR; | |
2658 | } | |
94836de2 | 2659 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2660 | } else { |
94836de2 MC |
2661 | if (!s->s3->handshake_buffer) { |
2662 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2663 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2664 | ossl_statem_set_error(s); |
94836de2 MC |
2665 | return WORK_ERROR; |
2666 | } | |
2667 | /* | |
2668 | * For sigalgs freeze the handshake buffer. If we support | |
2669 | * extms we've done this already so this is a no-op | |
2670 | */ | |
2671 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2672 | ossl_statem_set_error(s); |
94836de2 MC |
2673 | return WORK_ERROR; |
2674 | } | |
94836de2 MC |
2675 | } |
2676 | ||
2677 | return WORK_FINISHED_CONTINUE; | |
2678 | } | |
2679 | ||
be3583fa | 2680 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2681 | { |
2682 | EVP_PKEY *pkey = NULL; | |
b6981744 | 2683 | const unsigned char *sig, *data; |
5ca17d8c | 2684 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2685 | unsigned char *gost_data = NULL; |
5ca17d8c | 2686 | #endif |
e27f234a | 2687 | int al, ret = MSG_PROCESS_ERROR; |
28f4580c | 2688 | int type = 0, j; |
e27f234a MC |
2689 | unsigned int len; |
2690 | X509 *peer; | |
2691 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2692 | long hdatalen = 0; |
2693 | void *hdata; | |
2694 | ||
bfb0641f | 2695 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
6e59a892 RL |
2696 | |
2697 | if (mctx == NULL) { | |
2698 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2699 | al = SSL_AD_INTERNAL_ERROR; | |
2700 | goto f_err; | |
2701 | } | |
e27f234a | 2702 | |
a0bd6493 | 2703 | peer = s->session->peer; |
8382fd3a | 2704 | pkey = X509_get0_pubkey(peer); |
a0bd6493 | 2705 | type = X509_certificate_type(peer, pkey); |
0f113f3e MC |
2706 | |
2707 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2708 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2709 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2710 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2711 | goto f_err; | |
2712 | } | |
2713 | ||
0f113f3e MC |
2714 | /* Check for broken implementations of GOST ciphersuites */ |
2715 | /* | |
2716 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2717 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2718 | */ |
2a9b9654 | 2719 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2720 | if (PACKET_remaining(pkt) == 64 |
2721 | && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { | |
f532a35d | 2722 | len = 64; |
2a9b9654 MC |
2723 | } else |
2724 | #endif | |
2725 | { | |
0f113f3e | 2726 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2727 | int rv; |
2728 | ||
73999b62 | 2729 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2730 | al = SSL_AD_DECODE_ERROR; |
2731 | goto f_err; | |
2732 | } | |
2733 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2734 | if (rv == -1) { |
2735 | al = SSL_AD_INTERNAL_ERROR; | |
2736 | goto f_err; | |
2737 | } else if (rv == 0) { | |
2738 | al = SSL_AD_DECODE_ERROR; | |
2739 | goto f_err; | |
2740 | } | |
f37f20ff | 2741 | #ifdef SSL_DEBUG |
0f113f3e | 2742 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2743 | #endif |
28f4580c | 2744 | } else { |
aa430c74 DSH |
2745 | /* Use default digest for this key type */ |
2746 | int idx = ssl_cert_type(NULL, pkey); | |
2747 | if (idx >= 0) | |
2748 | md = s->s3->tmp.md[idx]; | |
2749 | if (md == NULL) { | |
2750 | al = SSL_AD_INTERNAL_ERROR; | |
2751 | goto f_err; | |
2752 | } | |
0f113f3e | 2753 | } |
aa430c74 | 2754 | |
73999b62 | 2755 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2756 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2757 | al = SSL_AD_DECODE_ERROR; |
2758 | goto f_err; | |
2759 | } | |
2760 | } | |
2761 | j = EVP_PKEY_size(pkey); | |
73999b62 MC |
2762 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
2763 | || (PACKET_remaining(pkt) == 0)) { | |
e27f234a | 2764 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2765 | al = SSL_AD_DECODE_ERROR; |
2766 | goto f_err; | |
2767 | } | |
73999b62 | 2768 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2769 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2770 | al = SSL_AD_DECODE_ERROR; |
2771 | goto f_err; | |
2772 | } | |
0f113f3e | 2773 | |
28f4580c DSH |
2774 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2775 | if (hdatalen <= 0) { | |
2776 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2777 | al = SSL_AD_INTERNAL_ERROR; | |
2778 | goto f_err; | |
2779 | } | |
f37f20ff | 2780 | #ifdef SSL_DEBUG |
28f4580c | 2781 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2782 | #endif |
6e59a892 RL |
2783 | if (!EVP_VerifyInit_ex(mctx, md, NULL) |
2784 | || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) { | |
28f4580c DSH |
2785 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
2786 | al = SSL_AD_INTERNAL_ERROR; | |
2787 | goto f_err; | |
2788 | } | |
0f113f3e | 2789 | |
2a9b9654 | 2790 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2791 | { |
2792 | int pktype = EVP_PKEY_id(pkey); | |
2793 | if (pktype == NID_id_GostR3410_2001 | |
2794 | || pktype == NID_id_GostR3410_2012_256 | |
b6981744 EK |
2795 | || pktype == NID_id_GostR3410_2012_512) { |
2796 | if ((gost_data = OPENSSL_malloc(len)) == NULL) { | |
2797 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2798 | al = SSL_AD_INTERNAL_ERROR; | |
2799 | goto f_err; | |
2800 | } | |
2801 | BUF_reverse(gost_data, data, len); | |
2802 | data = gost_data; | |
2803 | } | |
28f4580c | 2804 | } |
2a9b9654 | 2805 | #endif |
e44380a9 | 2806 | |
28f4580c | 2807 | if (s->version == SSL3_VERSION |
6e59a892 | 2808 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
28f4580c DSH |
2809 | s->session->master_key_length, |
2810 | s->session->master_key)) { | |
2811 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2812 | al = SSL_AD_INTERNAL_ERROR; | |
2813 | goto f_err; | |
2814 | } | |
2815 | ||
6e59a892 | 2816 | if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) { |
28f4580c DSH |
2817 | al = SSL_AD_DECRYPT_ERROR; |
2818 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2819 | goto f_err; |
2820 | } | |
2821 | ||
c130dd8e | 2822 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2823 | if (0) { |
2824 | f_err: | |
2825 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 2826 | ossl_statem_set_error(s); |
0f113f3e | 2827 | } |
25aaa98a RS |
2828 | BIO_free(s->s3->handshake_buffer); |
2829 | s->s3->handshake_buffer = NULL; | |
bfb0641f | 2830 | EVP_MD_CTX_free(mctx); |
5ca17d8c | 2831 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2832 | OPENSSL_free(gost_data); |
5ca17d8c | 2833 | #endif |
e27f234a | 2834 | return ret; |
0f113f3e | 2835 | } |
d02b48c6 | 2836 | |
be3583fa | 2837 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 2838 | { |
20dbe585 | 2839 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
2840 | X509 *x = NULL; |
2841 | unsigned long l, llen; | |
b6981744 | 2842 | const unsigned char *certstart, *certbytes; |
e27f234a | 2843 | STACK_OF(X509) *sk = NULL; |
73999b62 | 2844 | PACKET spkt; |
0f113f3e MC |
2845 | |
2846 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
2847 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2848 | goto f_err; | |
0f113f3e MC |
2849 | } |
2850 | ||
73999b62 MC |
2851 | if (!PACKET_get_net_3(pkt, &llen) |
2852 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
2853 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 2854 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2855 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2856 | goto f_err; |
2857 | } | |
0bc09ecd MC |
2858 | |
2859 | while (PACKET_remaining(&spkt) > 0) { | |
2860 | if (!PACKET_get_net_3(&spkt, &l) | |
2861 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { | |
0f113f3e | 2862 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2863 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2864 | SSL_R_CERT_LENGTH_MISMATCH); |
2865 | goto f_err; | |
2866 | } | |
2867 | ||
0bc09ecd MC |
2868 | certstart = certbytes; |
2869 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 2870 | if (x == NULL) { |
e27f234a MC |
2871 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
2872 | goto f_err; | |
0f113f3e | 2873 | } |
0bc09ecd | 2874 | if (certbytes != (certstart + l)) { |
0f113f3e | 2875 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2876 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2877 | SSL_R_CERT_LENGTH_MISMATCH); |
2878 | goto f_err; | |
2879 | } | |
2880 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
2881 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2882 | goto f_err; | |
0f113f3e MC |
2883 | } |
2884 | x = NULL; | |
0f113f3e MC |
2885 | } |
2886 | ||
2887 | if (sk_X509_num(sk) <= 0) { | |
2888 | /* TLS does not mind 0 certs returned */ | |
2889 | if (s->version == SSL3_VERSION) { | |
2890 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2891 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2892 | SSL_R_NO_CERTIFICATES_RETURNED); |
2893 | goto f_err; | |
2894 | } | |
2895 | /* Fail for TLS only if we required a certificate */ | |
2896 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
2897 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 2898 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2899 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
2900 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2901 | goto f_err; | |
2902 | } | |
2903 | /* No client certificate so digest cached records */ | |
124037fd | 2904 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
2905 | goto f_err; |
2906 | } | |
2907 | } else { | |
2908 | EVP_PKEY *pkey; | |
2909 | i = ssl_verify_cert_chain(s, sk); | |
2910 | if (i <= 0) { | |
2911 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 2912 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2913 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
2914 | goto f_err; | |
2915 | } | |
2916 | if (i > 1) { | |
e27f234a | 2917 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
2918 | al = SSL_AD_HANDSHAKE_FAILURE; |
2919 | goto f_err; | |
2920 | } | |
8382fd3a | 2921 | pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); |
0f113f3e MC |
2922 | if (pkey == NULL) { |
2923 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2924 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2925 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
2926 | goto f_err; | |
2927 | } | |
0f113f3e MC |
2928 | } |
2929 | ||
222561fe | 2930 | X509_free(s->session->peer); |
0f113f3e MC |
2931 | s->session->peer = sk_X509_shift(sk); |
2932 | s->session->verify_result = s->verify_result; | |
2933 | ||
c34b0f99 DSH |
2934 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
2935 | s->session->peer_chain = sk; | |
0f113f3e MC |
2936 | /* |
2937 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
d4d78943 | 2938 | * certificate, while we do include it in statem_clnt.c |
0f113f3e | 2939 | */ |
0f113f3e | 2940 | sk = NULL; |
e27f234a | 2941 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
2942 | goto done; |
2943 | ||
0f113f3e | 2944 | f_err: |
66696478 | 2945 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 2946 | ossl_statem_set_error(s); |
66696478 | 2947 | done: |
222561fe RS |
2948 | X509_free(x); |
2949 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 2950 | return ret; |
0f113f3e | 2951 | } |
d02b48c6 | 2952 | |
e27f234a MC |
2953 | int tls_construct_server_certificate(SSL *s) |
2954 | { | |
2955 | CERT_PKEY *cpk; | |
2956 | ||
2957 | cpk = ssl_get_server_send_pkey(s); | |
2958 | if (cpk == NULL) { | |
2959 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2960 | ossl_statem_set_error(s); |
e27f234a MC |
2961 | return 0; |
2962 | } | |
2963 | ||
2964 | if (!ssl3_output_cert_chain(s, cpk)) { | |
2965 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2966 | ossl_statem_set_error(s); |
e27f234a MC |
2967 | return 0; |
2968 | } | |
2969 | ||
2970 | return 1; | |
2971 | } | |
2972 | ||
e27f234a MC |
2973 | int tls_construct_new_session_ticket(SSL *s) |
2974 | { | |
2975 | unsigned char *senc = NULL; | |
846ec07d | 2976 | EVP_CIPHER_CTX *ctx; |
bf7c6817 | 2977 | HMAC_CTX *hctx = NULL; |
e27f234a MC |
2978 | unsigned char *p, *macstart; |
2979 | const unsigned char *const_p; | |
2980 | int len, slen_full, slen; | |
2981 | SSL_SESSION *sess; | |
2982 | unsigned int hlen; | |
2983 | SSL_CTX *tctx = s->initial_ctx; | |
2984 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
d139723b KR |
2985 | unsigned char key_name[TLSEXT_KEYNAME_LENGTH]; |
2986 | int iv_len; | |
e27f234a MC |
2987 | |
2988 | /* get session encoding length */ | |
2989 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
2990 | /* | |
2991 | * Some length values are 16 bits, so forget it if session is too | |
2992 | * long | |
2993 | */ | |
2994 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 2995 | ossl_statem_set_error(s); |
e27f234a MC |
2996 | return 0; |
2997 | } | |
2998 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 2999 | if (senc == NULL) { |
fe3a3291 | 3000 | ossl_statem_set_error(s); |
e27f234a MC |
3001 | return 0; |
3002 | } | |
0f113f3e | 3003 | |
846ec07d | 3004 | ctx = EVP_CIPHER_CTX_new(); |
bf7c6817 | 3005 | hctx = HMAC_CTX_new(); |
0f113f3e | 3006 | |
e27f234a MC |
3007 | p = senc; |
3008 | if (!i2d_SSL_SESSION(s->session, &p)) | |
3009 | goto err; | |
687eaf27 | 3010 | |
e27f234a MC |
3011 | /* |
3012 | * create a fresh copy (not shared with other threads) to clean up | |
3013 | */ | |
3014 | const_p = senc; | |
3015 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3016 | if (sess == NULL) | |
3017 | goto err; | |
3018 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3019 | |
e27f234a MC |
3020 | slen = i2d_SSL_SESSION(sess, NULL); |
3021 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3022 | SSL_SESSION_free(sess); | |
3023 | goto err; | |
3024 | } | |
3025 | p = senc; | |
3026 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3027 | SSL_SESSION_free(sess); | |
3028 | goto err; | |
3029 | } | |
3030 | SSL_SESSION_free(sess); | |
0f113f3e | 3031 | |
e27f234a MC |
3032 | /*- |
3033 | * Grow buffer if need be: the length calculation is as | |
3034 | * follows handshake_header_length + | |
3035 | * 4 (ticket lifetime hint) + 2 (ticket length) + | |
d139723b KR |
3036 | * sizeof(keyname) + max_iv_len (iv length) + |
3037 | * max_enc_block_size (max encrypted session * length) + | |
3038 | * max_md_size (HMAC) + session_length. | |
e27f234a MC |
3039 | */ |
3040 | if (!BUF_MEM_grow(s->init_buf, | |
d139723b KR |
3041 | SSL_HM_HEADER_LENGTH(s) + 6 + sizeof(key_name) + |
3042 | EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH + | |
3043 | EVP_MAX_MD_SIZE + slen)) | |
e27f234a | 3044 | goto err; |
0f113f3e | 3045 | |
e27f234a MC |
3046 | p = ssl_handshake_start(s); |
3047 | /* | |
3048 | * Initialize HMAC and cipher contexts. If callback present it does | |
3049 | * all the work otherwise use generated values from parent ctx. | |
3050 | */ | |
3051 | if (tctx->tlsext_ticket_key_cb) { | |
5c753de6 TS |
3052 | /* if 0 is returned, write an empty ticket */ |
3053 | int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx, | |
3054 | hctx, 1); | |
3055 | ||
3056 | if (ret == 0) { | |
3057 | l2n(0, p); /* timeout */ | |
3058 | s2n(0, p); /* length */ | |
3059 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, p - ssl_handshake_start(s))) | |
3060 | goto err; | |
3061 | OPENSSL_free(senc); | |
3062 | EVP_CIPHER_CTX_free(ctx); | |
3063 | HMAC_CTX_free(hctx); | |
3064 | return 1; | |
3065 | } | |
3066 | if (ret < 0) | |
e27f234a | 3067 | goto err; |
d139723b | 3068 | iv_len = EVP_CIPHER_CTX_iv_length(ctx); |
e27f234a | 3069 | } else { |
d139723b KR |
3070 | const EVP_CIPHER *cipher = EVP_aes_256_cbc(); |
3071 | ||
3072 | iv_len = EVP_CIPHER_iv_length(cipher); | |
3073 | if (RAND_bytes(iv, iv_len) <= 0) | |
687eaf27 | 3074 | goto err; |
d139723b | 3075 | if (!EVP_EncryptInit_ex(ctx, cipher, NULL, |
e27f234a | 3076 | tctx->tlsext_tick_aes_key, iv)) |
687eaf27 | 3077 | goto err; |
4e2e1ec9 TS |
3078 | if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, |
3079 | sizeof(tctx->tlsext_tick_hmac_key), | |
e27f234a | 3080 | EVP_sha256(), NULL)) |
4f9fab6b | 3081 | goto err; |
4e2e1ec9 TS |
3082 | memcpy(key_name, tctx->tlsext_tick_key_name, |
3083 | sizeof(tctx->tlsext_tick_key_name)); | |
0f113f3e MC |
3084 | } |
3085 | ||
e27f234a MC |
3086 | /* |
3087 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3088 | * for resumed session (for simplicity), and guess that tickets for | |
3089 | * new sessions will live as long as their sessions. | |
3090 | */ | |
3091 | l2n(s->hit ? 0 : s->session->timeout, p); | |
3092 | ||
3093 | /* Skip ticket length for now */ | |
3094 | p += 2; | |
3095 | /* Output key name */ | |
3096 | macstart = p; | |
d139723b KR |
3097 | memcpy(p, key_name, sizeof(key_name)); |
3098 | p += sizeof(key_name); | |
e27f234a | 3099 | /* output IV */ |
d139723b KR |
3100 | memcpy(p, iv, iv_len); |
3101 | p += iv_len; | |
e27f234a | 3102 | /* Encrypt session data */ |
846ec07d | 3103 | if (!EVP_EncryptUpdate(ctx, p, &len, senc, slen)) |
e27f234a MC |
3104 | goto err; |
3105 | p += len; | |
846ec07d | 3106 | if (!EVP_EncryptFinal(ctx, p, &len)) |
e27f234a MC |
3107 | goto err; |
3108 | p += len; | |
3109 | ||
bf7c6817 | 3110 | if (!HMAC_Update(hctx, macstart, p - macstart)) |
e27f234a | 3111 | goto err; |
bf7c6817 | 3112 | if (!HMAC_Final(hctx, p, &hlen)) |
e27f234a MC |
3113 | goto err; |
3114 | ||
846ec07d | 3115 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3116 | HMAC_CTX_free(hctx); |
846ec07d RL |
3117 | ctx = NULL; |
3118 | hctx = NULL; | |
e27f234a MC |
3119 | |
3120 | p += hlen; | |
3121 | /* Now write out lengths: p points to end of data written */ | |
3122 | /* Total length */ | |
3123 | len = p - ssl_handshake_start(s); | |
3124 | /* Skip ticket lifetime hint */ | |
3125 | p = ssl_handshake_start(s) + 4; | |
3126 | s2n(len - 6, p); | |
3127 | if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len)) | |
3128 | goto err; | |
3129 | OPENSSL_free(senc); | |
3130 | ||
3131 | return 1; | |
687eaf27 | 3132 | err: |
b548a1f1 | 3133 | OPENSSL_free(senc); |
846ec07d | 3134 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3135 | HMAC_CTX_free(hctx); |
fe3a3291 | 3136 | ossl_statem_set_error(s); |
e27f234a | 3137 | return 0; |
0f113f3e | 3138 | } |
67c8e7f4 | 3139 | |
e27f234a MC |
3140 | int tls_construct_cert_status(SSL *s) |
3141 | { | |
3142 | unsigned char *p; | |
3143 | /*- | |
3144 | * Grow buffer if need be: the length calculation is as | |
3145 | * follows 1 (message type) + 3 (message length) + | |
3146 | * 1 (ocsp response type) + 3 (ocsp response length) | |
3147 | * + (ocsp response) | |
3148 | */ | |
3149 | if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) { | |
fe3a3291 | 3150 | ossl_statem_set_error(s); |
e27f234a MC |
3151 | return 0; |
3152 | } | |
3153 | ||
3154 | p = (unsigned char *)s->init_buf->data; | |
3155 | ||
3156 | /* do the header */ | |
3157 | *(p++) = SSL3_MT_CERTIFICATE_STATUS; | |
3158 | /* message length */ | |
3159 | l2n3(s->tlsext_ocsp_resplen + 4, p); | |
3160 | /* status type */ | |
3161 | *(p++) = s->tlsext_status_type; | |
3162 | /* length of OCSP response */ | |
3163 | l2n3(s->tlsext_ocsp_resplen, p); | |
3164 | /* actual response */ | |
3165 | memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen); | |
3166 | /* number of bytes to write */ | |
3167 | s->init_num = 8 + s->tlsext_ocsp_resplen; | |
3168 | s->init_off = 0; | |
3169 | ||
3170 | return 1; | |
3171 | } | |
3172 | ||
e481f9b9 | 3173 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3174 | /* |
3175 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3176 | * It sets the next_proto member in s if found | |
3177 | */ | |
be3583fa | 3178 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3179 | { |
73999b62 | 3180 | PACKET next_proto, padding; |
e27f234a MC |
3181 | size_t next_proto_len; |
3182 | ||
50e735f9 MC |
3183 | /*- |
3184 | * The payload looks like: | |
3185 | * uint8 proto_len; | |
3186 | * uint8 proto[proto_len]; | |
3187 | * uint8 padding_len; | |
3188 | * uint8 padding[padding_len]; | |
3189 | */ | |
73999b62 MC |
3190 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3191 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3192 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3193 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3194 | goto err; |
cf9b0b6f | 3195 | } |
0f113f3e | 3196 | |
6d41fc80 EK |
3197 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, |
3198 | &next_proto_len)) { | |
3199 | s->next_proto_negotiated_len = 0; | |
c3fc7eea MC |
3200 | goto err; |
3201 | } | |
3202 | ||
6d41fc80 | 3203 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3204 | |
e27f234a | 3205 | return MSG_PROCESS_CONTINUE_READING; |
c3fc7eea | 3206 | err: |
fe3a3291 | 3207 | ossl_statem_set_error(s); |
e27f234a | 3208 | return MSG_PROCESS_ERROR; |
0f113f3e | 3209 | } |
6434abbf | 3210 | #endif |
d45ba43d MC |
3211 | |
3212 | #define SSLV2_CIPHER_LEN 3 | |
3213 | ||
38a3cbfb EK |
3214 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3215 | PACKET *cipher_suites, | |
d45ba43d | 3216 | STACK_OF(SSL_CIPHER) **skp, |
38a3cbfb EK |
3217 | int sslv2format, int *al |
3218 | ) | |
d45ba43d MC |
3219 | { |
3220 | const SSL_CIPHER *c; | |
3221 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3222 | int n; |
3223 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3224 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3225 | |
38a3cbfb EK |
3226 | s->s3->send_connection_binding = 0; |
3227 | ||
3228 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3229 | ||
3230 | if (PACKET_remaining(cipher_suites) == 0) { | |
3231 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3232 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3233 | return NULL; | |
d45ba43d | 3234 | } |
38a3cbfb EK |
3235 | |
3236 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3237 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3238 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3239 | *al = SSL_AD_DECODE_ERROR; |
3240 | return NULL; | |
d45ba43d | 3241 | } |
38a3cbfb | 3242 | |
d45ba43d MC |
3243 | if ((skp == NULL) || (*skp == NULL)) { |
3244 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
3245 | if(sk == NULL) { | |
3246 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3247 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3248 | return NULL; |
3249 | } | |
3250 | } else { | |
3251 | sk = *skp; | |
3252 | sk_SSL_CIPHER_zero(sk); | |
3253 | } | |
3254 | ||
38a3cbfb EK |
3255 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3256 | &s->s3->tmp.ciphers_rawlen)) { | |
3257 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3258 | goto err; |
3259 | } | |
d45ba43d | 3260 | |
38a3cbfb EK |
3261 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3262 | /* | |
20218b58 EK |
3263 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3264 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3265 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3266 | */ |
3267 | if (sslv2format && cipher[0] != '\0') | |
3268 | continue; | |
3269 | ||
d45ba43d | 3270 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3271 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3272 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3273 | /* SCSV fatal if renegotiating */ |
3274 | if (s->renegotiate) { | |
3275 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3276 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3277 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3278 | goto err; |
3279 | } | |
3280 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3281 | continue; |
3282 | } | |
3283 | ||
3284 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3285 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3286 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3287 | /* |
3288 | * The SCSV indicates that the client previously tried a higher | |
3289 | * version. Fail if the current version is an unexpected | |
3290 | * downgrade. | |
3291 | */ | |
4fa52141 | 3292 | if (!ssl_check_version_downgrade(s)) { |
d45ba43d MC |
3293 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3294 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3295 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3296 | goto err; |
3297 | } | |
d45ba43d MC |
3298 | continue; |
3299 | } | |
3300 | ||
38a3cbfb EK |
3301 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3302 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3303 | if (c != NULL) { |
3304 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3305 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3306 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3307 | goto err; |
3308 | } | |
3309 | } | |
3310 | } | |
38a3cbfb EK |
3311 | if (PACKET_remaining(cipher_suites) > 0) { |
3312 | *al = SSL_AD_INTERNAL_ERROR; | |
3313 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3314 | goto err; | |
3315 | } | |
d45ba43d MC |
3316 | |
3317 | if (skp != NULL) | |
3318 | *skp = sk; | |
3319 | return (sk); | |
3320 | err: | |
3321 | if ((skp == NULL) || (*skp == NULL)) | |
3322 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3323 | return NULL; |
d45ba43d | 3324 | } |