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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 | |
d02b48c6 | 50 | #include <stdio.h> |
8ba708e5 | 51 | #include "../ssl_locl.h" |
61ae935a | 52 | #include "statem_locl.h" |
68570797 | 53 | #include "internal/constant_time_locl.h" |
ec577822 BM |
54 | #include <openssl/buffer.h> |
55 | #include <openssl/rand.h> | |
56 | #include <openssl/objects.h> | |
57 | #include <openssl/evp.h> | |
6434abbf | 58 | #include <openssl/hmac.h> |
ec577822 | 59 | #include <openssl/x509.h> |
3c27208f | 60 | #include <openssl/dh.h> |
d095b68d | 61 | #include <openssl/bn.h> |
dbad1690 | 62 | #include <openssl/md5.h> |
f9b3bff6 | 63 | |
38a3cbfb EK |
64 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
65 | PACKET *cipher_suites, | |
a230b26e EK |
66 | STACK_OF(SSL_CIPHER) |
67 | **skp, int sslv2format, | |
68 | 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 | 83 | |
e8aa8b6c | 84 | switch (st->hand_state) { |
f3b3d7f0 RS |
85 | default: |
86 | break; | |
87 | ||
61ae935a MC |
88 | case TLS_ST_BEFORE: |
89 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
90 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
91 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
92 | return 1; | |
93 | } | |
94 | break; | |
95 | ||
96 | case TLS_ST_SW_SRVR_DONE: | |
97 | /* | |
98 | * If we get a CKE message after a ServerDone then either | |
99 | * 1) We didn't request a Certificate | |
100 | * OR | |
101 | * 2) If we did request one then | |
102 | * a) We allow no Certificate to be returned | |
103 | * AND | |
104 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
105 | * list if we requested a certificate) | |
106 | */ | |
0f512756 MC |
107 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { |
108 | if (s->s3->tmp.cert_request) { | |
109 | if (s->version == SSL3_VERSION) { | |
23dd09b5 MC |
110 | if ((s->verify_mode & SSL_VERIFY_PEER) |
111 | && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
0f512756 MC |
112 | /* |
113 | * This isn't an unexpected message as such - we're just | |
23dd09b5 MC |
114 | * not going to accept it because we require a client |
115 | * cert. | |
0f512756 MC |
116 | */ |
117 | ssl3_send_alert(s, SSL3_AL_FATAL, | |
118 | SSL3_AD_HANDSHAKE_FAILURE); | |
340a2828 | 119 | SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, |
0f512756 MC |
120 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
121 | return 0; | |
122 | } | |
123 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
124 | return 1; | |
125 | } | |
126 | } else { | |
127 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
128 | return 1; | |
129 | } | |
61ae935a MC |
130 | } else if (s->s3->tmp.cert_request) { |
131 | if (mt == SSL3_MT_CERTIFICATE) { | |
132 | st->hand_state = TLS_ST_SR_CERT; | |
133 | return 1; | |
f100b031 | 134 | } |
61ae935a MC |
135 | } |
136 | break; | |
137 | ||
138 | case TLS_ST_SR_CERT: | |
139 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
140 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
141 | return 1; | |
142 | } | |
143 | break; | |
144 | ||
145 | case TLS_ST_SR_KEY_EXCH: | |
146 | /* | |
147 | * We should only process a CertificateVerify message if we have | |
148 | * received a Certificate from the client. If so then |s->session->peer| | |
149 | * will be non NULL. In some instances a CertificateVerify message is | |
150 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 151 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
152 | * set. |
153 | */ | |
a71a4966 | 154 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
155 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
156 | /* | |
157 | * For the ECDH ciphersuites when the client sends its ECDH | |
158 | * pub key in a certificate, the CertificateVerify message is | |
159 | * not sent. Also for GOST ciphersuites when the client uses | |
160 | * its key from the certificate for key exchange. | |
161 | */ | |
162 | st->hand_state = TLS_ST_SR_CHANGE; | |
163 | return 1; | |
164 | } | |
165 | } else { | |
166 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
167 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
168 | return 1; | |
169 | } | |
170 | } | |
171 | break; | |
172 | ||
173 | case TLS_ST_SR_CERT_VRFY: | |
174 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
175 | st->hand_state = TLS_ST_SR_CHANGE; | |
176 | return 1; | |
177 | } | |
178 | break; | |
179 | ||
180 | case TLS_ST_SR_CHANGE: | |
181 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
182 | if (s->s3->next_proto_neg_seen) { | |
183 | if (mt == SSL3_MT_NEXT_PROTO) { | |
184 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
185 | return 1; | |
186 | } | |
187 | } else { | |
188 | #endif | |
189 | if (mt == SSL3_MT_FINISHED) { | |
190 | st->hand_state = TLS_ST_SR_FINISHED; | |
191 | return 1; | |
192 | } | |
193 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
194 | } | |
195 | #endif | |
196 | break; | |
197 | ||
198 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
199 | case TLS_ST_SR_NEXT_PROTO: | |
200 | if (mt == SSL3_MT_FINISHED) { | |
201 | st->hand_state = TLS_ST_SR_FINISHED; | |
202 | return 1; | |
203 | } | |
204 | break; | |
205 | #endif | |
206 | ||
207 | case TLS_ST_SW_FINISHED: | |
208 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
209 | st->hand_state = TLS_ST_SR_CHANGE; | |
210 | return 1; | |
211 | } | |
212 | break; | |
61ae935a MC |
213 | } |
214 | ||
215 | /* No valid transition found */ | |
672f3337 | 216 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); |
340a2828 | 217 | SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, 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 | */ | |
a230b26e | 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 | |
a230b26e | 256 | ) { |
61ae935a MC |
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) | |
a230b26e EK |
287 | /* |
288 | * ... except when the application insists on | |
289 | * verification (against the specs, but statem_clnt.c accepts | |
290 | * this for SSL 3) | |
291 | */ | |
61ae935a MC |
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 | 313 | |
e8aa8b6c | 314 | switch (st->hand_state) { |
f3b3d7f0 RS |
315 | default: |
316 | /* Shouldn't happen */ | |
317 | return WRITE_TRAN_ERROR; | |
318 | ||
e8aa8b6c | 319 | case TLS_ST_BEFORE: |
a230b26e | 320 | /* Just go straight to trying to read from the client */ |
e8aa8b6c | 321 | return WRITE_TRAN_FINISHED; |
61ae935a | 322 | |
e8aa8b6c F |
323 | case TLS_ST_OK: |
324 | /* We must be trying to renegotiate */ | |
325 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
326 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 327 | |
e8aa8b6c F |
328 | case TLS_ST_SW_HELLO_REQ: |
329 | st->hand_state = TLS_ST_OK; | |
330 | ossl_statem_set_in_init(s, 0); | |
331 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 332 | |
e8aa8b6c F |
333 | case TLS_ST_SR_CLNT_HELLO: |
334 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
a230b26e | 335 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) |
e8aa8b6c F |
336 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; |
337 | else | |
338 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
339 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 340 | |
e8aa8b6c F |
341 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: |
342 | return WRITE_TRAN_FINISHED; | |
61ae935a | 343 | |
e8aa8b6c F |
344 | case TLS_ST_SW_SRVR_HELLO: |
345 | if (s->hit) { | |
346 | if (s->tlsext_ticket_expected) | |
347 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
348 | else | |
349 | st->hand_state = TLS_ST_SW_CHANGE; | |
350 | } else { | |
351 | /* Check if it is anon DH or anon ECDH, */ | |
352 | /* normal PSK or SRP */ | |
353 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
a230b26e | 354 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { |
e8aa8b6c F |
355 | st->hand_state = TLS_ST_SW_CERT; |
356 | } else if (send_server_key_exchange(s)) { | |
61ae935a | 357 | st->hand_state = TLS_ST_SW_KEY_EXCH; |
e8aa8b6c | 358 | } else if (send_certificate_request(s)) { |
61ae935a | 359 | st->hand_state = TLS_ST_SW_CERT_REQ; |
e8aa8b6c F |
360 | } else { |
361 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
61ae935a | 362 | } |
e8aa8b6c F |
363 | } |
364 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 365 | |
e8aa8b6c F |
366 | case TLS_ST_SW_CERT: |
367 | if (s->tlsext_status_expected) { | |
368 | st->hand_state = TLS_ST_SW_CERT_STATUS; | |
61ae935a | 369 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
370 | } |
371 | /* Fall through */ | |
61ae935a | 372 | |
e8aa8b6c F |
373 | case TLS_ST_SW_CERT_STATUS: |
374 | if (send_server_key_exchange(s)) { | |
375 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
61ae935a | 376 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
377 | } |
378 | /* Fall through */ | |
61ae935a | 379 | |
e8aa8b6c F |
380 | case TLS_ST_SW_KEY_EXCH: |
381 | if (send_certificate_request(s)) { | |
382 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
61ae935a | 383 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
384 | } |
385 | /* Fall through */ | |
61ae935a | 386 | |
e8aa8b6c F |
387 | case TLS_ST_SW_CERT_REQ: |
388 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
389 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 390 | |
e8aa8b6c F |
391 | case TLS_ST_SW_SRVR_DONE: |
392 | return WRITE_TRAN_FINISHED; | |
393 | ||
394 | case TLS_ST_SR_FINISHED: | |
395 | if (s->hit) { | |
61ae935a | 396 | st->hand_state = TLS_ST_OK; |
fe3a3291 | 397 | ossl_statem_set_in_init(s, 0); |
61ae935a | 398 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
399 | } else if (s->tlsext_ticket_expected) { |
400 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
401 | } else { | |
402 | st->hand_state = TLS_ST_SW_CHANGE; | |
403 | } | |
404 | return WRITE_TRAN_CONTINUE; | |
405 | ||
406 | case TLS_ST_SW_SESSION_TICKET: | |
407 | st->hand_state = TLS_ST_SW_CHANGE; | |
408 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 409 | |
e8aa8b6c F |
410 | case TLS_ST_SW_CHANGE: |
411 | st->hand_state = TLS_ST_SW_FINISHED; | |
412 | return WRITE_TRAN_CONTINUE; | |
413 | ||
414 | case TLS_ST_SW_FINISHED: | |
415 | if (s->hit) { | |
416 | return WRITE_TRAN_FINISHED; | |
417 | } | |
418 | st->hand_state = TLS_ST_OK; | |
419 | ossl_statem_set_in_init(s, 0); | |
420 | return WRITE_TRAN_CONTINUE; | |
61ae935a MC |
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 | 431 | |
e8aa8b6c | 432 | switch (st->hand_state) { |
f3b3d7f0 RS |
433 | default: |
434 | /* No pre work to be done */ | |
435 | break; | |
436 | ||
61ae935a MC |
437 | case TLS_ST_SW_HELLO_REQ: |
438 | s->shutdown = 0; | |
439 | if (SSL_IS_DTLS(s)) | |
f5c7f5df | 440 | dtls1_clear_sent_buffer(s); |
61ae935a MC |
441 | break; |
442 | ||
443 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
444 | s->shutdown = 0; | |
445 | if (SSL_IS_DTLS(s)) { | |
f5c7f5df | 446 | dtls1_clear_sent_buffer(s); |
61ae935a MC |
447 | /* We don't buffer this message so don't use the timer */ |
448 | st->use_timer = 0; | |
449 | } | |
450 | break; | |
451 | ||
452 | case TLS_ST_SW_SRVR_HELLO: | |
453 | if (SSL_IS_DTLS(s)) { | |
454 | /* | |
455 | * Messages we write from now on should be bufferred and | |
456 | * retransmitted if necessary, so we need to use the timer now | |
457 | */ | |
458 | st->use_timer = 1; | |
459 | } | |
460 | break; | |
461 | ||
462 | case TLS_ST_SW_SRVR_DONE: | |
463 | #ifndef OPENSSL_NO_SCTP | |
464 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
465 | return dtls_wait_for_dry(s); | |
466 | #endif | |
467 | return WORK_FINISHED_CONTINUE; | |
468 | ||
469 | case TLS_ST_SW_SESSION_TICKET: | |
470 | if (SSL_IS_DTLS(s)) { | |
471 | /* | |
472 | * We're into the last flight. We don't retransmit the last flight | |
473 | * unless we need to, so we don't use the timer | |
474 | */ | |
475 | st->use_timer = 0; | |
476 | } | |
477 | break; | |
478 | ||
479 | case TLS_ST_SW_CHANGE: | |
480 | s->session->cipher = s->s3->tmp.new_cipher; | |
481 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 482 | ossl_statem_set_error(s); |
61ae935a MC |
483 | return WORK_ERROR; |
484 | } | |
485 | if (SSL_IS_DTLS(s)) { | |
486 | /* | |
487 | * We're into the last flight. We don't retransmit the last flight | |
488 | * unless we need to, so we don't use the timer. This might have | |
489 | * already been set to 0 if we sent a NewSessionTicket message, | |
490 | * but we'll set it again here in case we didn't. | |
491 | */ | |
492 | st->use_timer = 0; | |
493 | } | |
494 | return WORK_FINISHED_CONTINUE; | |
495 | ||
496 | case TLS_ST_OK: | |
497 | return tls_finish_handshake(s, wst); | |
61ae935a MC |
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 | ||
e8aa8b6c | 513 | switch (st->hand_state) { |
f3b3d7f0 RS |
514 | default: |
515 | /* No post work to be done */ | |
516 | break; | |
517 | ||
61ae935a MC |
518 | case TLS_ST_SW_HELLO_REQ: |
519 | if (statem_flush(s) != 1) | |
520 | return WORK_MORE_A; | |
2c4a056f MC |
521 | if (!ssl3_init_finished_mac(s)) { |
522 | ossl_statem_set_error(s); | |
523 | return WORK_ERROR; | |
524 | } | |
61ae935a MC |
525 | break; |
526 | ||
527 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
528 | if (statem_flush(s) != 1) | |
529 | return WORK_MORE_A; | |
530 | /* HelloVerifyRequest resets Finished MAC */ | |
2c4a056f MC |
531 | if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) { |
532 | ossl_statem_set_error(s); | |
533 | return WORK_ERROR; | |
534 | } | |
61ae935a MC |
535 | /* |
536 | * The next message should be another ClientHello which we need to | |
537 | * treat like it was the first packet | |
538 | */ | |
539 | s->first_packet = 1; | |
540 | break; | |
541 | ||
542 | case TLS_ST_SW_SRVR_HELLO: | |
543 | #ifndef OPENSSL_NO_SCTP | |
544 | if (SSL_IS_DTLS(s) && s->hit) { | |
545 | unsigned char sctpauthkey[64]; | |
546 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
547 | ||
548 | /* | |
549 | * Add new shared key for SCTP-Auth, will be ignored if no | |
550 | * SCTP used. | |
551 | */ | |
141eb8c6 MC |
552 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
553 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
554 | |
555 | if (SSL_export_keying_material(s, sctpauthkey, | |
a230b26e EK |
556 | sizeof(sctpauthkey), labelbuffer, |
557 | sizeof(labelbuffer), NULL, 0, | |
558 | 0) <= 0) { | |
fe3a3291 | 559 | ossl_statem_set_error(s); |
61ae935a MC |
560 | return WORK_ERROR; |
561 | } | |
562 | ||
563 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
564 | sizeof(sctpauthkey), sctpauthkey); | |
565 | } | |
566 | #endif | |
567 | break; | |
568 | ||
569 | case TLS_ST_SW_CHANGE: | |
570 | #ifndef OPENSSL_NO_SCTP | |
571 | if (SSL_IS_DTLS(s) && !s->hit) { | |
572 | /* | |
573 | * Change to new shared key of SCTP-Auth, will be ignored if | |
574 | * no SCTP used. | |
575 | */ | |
576 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
577 | 0, NULL); | |
578 | } | |
579 | #endif | |
580 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
a230b26e EK |
581 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) |
582 | { | |
fe3a3291 | 583 | ossl_statem_set_error(s); |
61ae935a MC |
584 | return WORK_ERROR; |
585 | } | |
586 | ||
587 | if (SSL_IS_DTLS(s)) | |
588 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
589 | break; | |
590 | ||
591 | case TLS_ST_SW_SRVR_DONE: | |
592 | if (statem_flush(s) != 1) | |
593 | return WORK_MORE_A; | |
594 | break; | |
595 | ||
596 | case TLS_ST_SW_FINISHED: | |
597 | if (statem_flush(s) != 1) | |
598 | return WORK_MORE_A; | |
599 | #ifndef OPENSSL_NO_SCTP | |
600 | if (SSL_IS_DTLS(s) && s->hit) { | |
601 | /* | |
602 | * Change to new shared key of SCTP-Auth, will be ignored if | |
603 | * no SCTP used. | |
604 | */ | |
605 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
606 | 0, NULL); | |
607 | } | |
608 | #endif | |
609 | break; | |
61ae935a MC |
610 | } |
611 | ||
612 | return WORK_FINISHED_CONTINUE; | |
613 | } | |
614 | ||
615 | /* | |
6392fb8e MC |
616 | * Get the message construction function and message type for sending from the |
617 | * server | |
61ae935a MC |
618 | * |
619 | * Valid return values are: | |
620 | * 1: Success | |
621 | * 0: Error | |
622 | */ | |
6392fb8e | 623 | int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt, |
a15c953f | 624 | confunc_f *confunc, int *mt) |
61ae935a | 625 | { |
d6f1a6e9 | 626 | OSSL_STATEM *st = &s->statem; |
61ae935a | 627 | |
4a01c59f MC |
628 | switch (st->hand_state) { |
629 | default: | |
630 | /* Shouldn't happen */ | |
631 | return 0; | |
632 | ||
633 | case TLS_ST_SW_CHANGE: | |
5923ad4b | 634 | if (SSL_IS_DTLS(s)) |
6392fb8e | 635 | *confunc = dtls_construct_change_cipher_spec; |
4a01c59f | 636 | else |
6392fb8e MC |
637 | *confunc = tls_construct_change_cipher_spec; |
638 | *mt = SSL3_MT_CHANGE_CIPHER_SPEC; | |
4a01c59f | 639 | break; |
f3b3d7f0 | 640 | |
4a01c59f | 641 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: |
6392fb8e MC |
642 | *confunc = dtls_construct_hello_verify_request; |
643 | *mt = DTLS1_MT_HELLO_VERIFY_REQUEST; | |
4a01c59f | 644 | break; |
61ae935a | 645 | |
4a01c59f MC |
646 | case TLS_ST_SW_HELLO_REQ: |
647 | /* No construction function needed */ | |
6392fb8e MC |
648 | *confunc = NULL; |
649 | *mt = SSL3_MT_HELLO_REQUEST; | |
4a01c59f | 650 | break; |
61ae935a | 651 | |
4a01c59f | 652 | case TLS_ST_SW_SRVR_HELLO: |
6392fb8e MC |
653 | *confunc = tls_construct_server_hello; |
654 | *mt = SSL3_MT_SERVER_HELLO; | |
4a01c59f | 655 | break; |
61ae935a | 656 | |
4a01c59f | 657 | case TLS_ST_SW_CERT: |
6392fb8e MC |
658 | *confunc = tls_construct_server_certificate; |
659 | *mt = SSL3_MT_CERTIFICATE; | |
4a01c59f | 660 | break; |
61ae935a | 661 | |
4a01c59f | 662 | case TLS_ST_SW_KEY_EXCH: |
6392fb8e MC |
663 | *confunc = tls_construct_server_key_exchange; |
664 | *mt = SSL3_MT_SERVER_KEY_EXCHANGE; | |
4a01c59f | 665 | break; |
61ae935a | 666 | |
4a01c59f | 667 | case TLS_ST_SW_CERT_REQ: |
6392fb8e MC |
668 | *confunc = tls_construct_certificate_request; |
669 | *mt = SSL3_MT_CERTIFICATE_REQUEST; | |
4a01c59f | 670 | break; |
61ae935a | 671 | |
4a01c59f | 672 | case TLS_ST_SW_SRVR_DONE: |
6392fb8e MC |
673 | *confunc = tls_construct_server_done; |
674 | *mt = SSL3_MT_SERVER_DONE; | |
4a01c59f | 675 | break; |
61ae935a | 676 | |
4a01c59f | 677 | case TLS_ST_SW_SESSION_TICKET: |
6392fb8e MC |
678 | *confunc = tls_construct_new_session_ticket; |
679 | *mt = SSL3_MT_NEWSESSION_TICKET; | |
4a01c59f | 680 | break; |
61ae935a | 681 | |
4a01c59f | 682 | case TLS_ST_SW_CERT_STATUS: |
6392fb8e MC |
683 | *confunc = tls_construct_cert_status; |
684 | *mt = SSL3_MT_CERTIFICATE_STATUS; | |
4a01c59f | 685 | break; |
61ae935a | 686 | |
4a01c59f | 687 | case TLS_ST_SW_FINISHED: |
6392fb8e MC |
688 | *confunc = tls_construct_finished; |
689 | *mt = SSL3_MT_FINISHED; | |
4a01c59f MC |
690 | break; |
691 | } | |
61ae935a | 692 | |
5923ad4b | 693 | return 1; |
61ae935a MC |
694 | } |
695 | ||
8a18bc25 AG |
696 | /* |
697 | * Maximum size (excluding the Handshake header) of a ClientHello message, | |
698 | * calculated as follows: | |
699 | * | |
700 | * 2 + # client_version | |
701 | * 32 + # only valid length for random | |
702 | * 1 + # length of session_id | |
703 | * 32 + # maximum size for session_id | |
704 | * 2 + # length of cipher suites | |
705 | * 2^16-2 + # maximum length of cipher suites array | |
706 | * 1 + # length of compression_methods | |
707 | * 2^8-1 + # maximum length of compression methods | |
708 | * 2 + # length of extensions | |
709 | * 2^16-1 # maximum length of extensions | |
710 | */ | |
711 | #define CLIENT_HELLO_MAX_LENGTH 131396 | |
712 | ||
61ae935a MC |
713 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 |
714 | #define NEXT_PROTO_MAX_LENGTH 514 | |
715 | ||
716 | /* | |
717 | * Returns the maximum allowed length for the current message that we are | |
718 | * reading. Excludes the message header. | |
719 | */ | |
eda75751 | 720 | size_t ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 721 | { |
d6f1a6e9 | 722 | OSSL_STATEM *st = &s->statem; |
61ae935a | 723 | |
e8aa8b6c | 724 | switch (st->hand_state) { |
f3b3d7f0 RS |
725 | default: |
726 | /* Shouldn't happen */ | |
727 | return 0; | |
728 | ||
61ae935a | 729 | case TLS_ST_SR_CLNT_HELLO: |
8a18bc25 | 730 | return CLIENT_HELLO_MAX_LENGTH; |
61ae935a MC |
731 | |
732 | case TLS_ST_SR_CERT: | |
733 | return s->max_cert_list; | |
734 | ||
735 | case TLS_ST_SR_KEY_EXCH: | |
736 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
737 | ||
738 | case TLS_ST_SR_CERT_VRFY: | |
739 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
740 | ||
741 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
742 | case TLS_ST_SR_NEXT_PROTO: | |
743 | return NEXT_PROTO_MAX_LENGTH; | |
744 | #endif | |
745 | ||
746 | case TLS_ST_SR_CHANGE: | |
747 | return CCS_MAX_LENGTH; | |
748 | ||
749 | case TLS_ST_SR_FINISHED: | |
750 | return FINISHED_MAX_LENGTH; | |
61ae935a | 751 | } |
61ae935a MC |
752 | } |
753 | ||
754 | /* | |
755 | * Process a message that the server has received from the client. | |
756 | */ | |
8481f583 | 757 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 758 | { |
d6f1a6e9 | 759 | OSSL_STATEM *st = &s->statem; |
61ae935a | 760 | |
e8aa8b6c | 761 | switch (st->hand_state) { |
f3b3d7f0 RS |
762 | default: |
763 | /* Shouldn't happen */ | |
764 | return MSG_PROCESS_ERROR; | |
765 | ||
61ae935a MC |
766 | case TLS_ST_SR_CLNT_HELLO: |
767 | return tls_process_client_hello(s, pkt); | |
768 | ||
769 | case TLS_ST_SR_CERT: | |
770 | return tls_process_client_certificate(s, pkt); | |
771 | ||
772 | case TLS_ST_SR_KEY_EXCH: | |
773 | return tls_process_client_key_exchange(s, pkt); | |
774 | ||
775 | case TLS_ST_SR_CERT_VRFY: | |
776 | return tls_process_cert_verify(s, pkt); | |
777 | ||
778 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
779 | case TLS_ST_SR_NEXT_PROTO: | |
780 | return tls_process_next_proto(s, pkt); | |
781 | #endif | |
782 | ||
783 | case TLS_ST_SR_CHANGE: | |
784 | return tls_process_change_cipher_spec(s, pkt); | |
785 | ||
786 | case TLS_ST_SR_FINISHED: | |
787 | return tls_process_finished(s, pkt); | |
61ae935a | 788 | } |
61ae935a MC |
789 | } |
790 | ||
791 | /* | |
792 | * Perform any further processing required following the receipt of a message | |
793 | * from the client | |
794 | */ | |
8481f583 | 795 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 796 | { |
d6f1a6e9 | 797 | OSSL_STATEM *st = &s->statem; |
61ae935a | 798 | |
e8aa8b6c | 799 | switch (st->hand_state) { |
f3b3d7f0 RS |
800 | default: |
801 | /* Shouldn't happen */ | |
802 | return WORK_ERROR; | |
803 | ||
61ae935a MC |
804 | case TLS_ST_SR_CLNT_HELLO: |
805 | return tls_post_process_client_hello(s, wst); | |
806 | ||
807 | case TLS_ST_SR_KEY_EXCH: | |
808 | return tls_post_process_client_key_exchange(s, wst); | |
809 | ||
810 | case TLS_ST_SR_CERT_VRFY: | |
811 | #ifndef OPENSSL_NO_SCTP | |
a230b26e EK |
812 | if ( /* Is this SCTP? */ |
813 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
814 | /* Are we renegotiating? */ | |
815 | && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
61ae935a MC |
816 | s->s3->in_read_app_data = 2; |
817 | s->rwstate = SSL_READING; | |
818 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
819 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 820 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
821 | return WORK_MORE_A; |
822 | } else { | |
d99b0691 | 823 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
824 | } |
825 | #endif | |
826 | return WORK_FINISHED_CONTINUE; | |
61ae935a MC |
827 | } |
828 | ||
61ae935a MC |
829 | } |
830 | ||
edc032b5 | 831 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 832 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
833 | { |
834 | int ret = SSL_ERROR_NONE; | |
835 | ||
836 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
837 | ||
838 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
839 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
840 | if (s->srp_ctx.login == NULL) { | |
841 | /* | |
842 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
843 | * login name | |
844 | */ | |
845 | ret = SSL3_AL_FATAL; | |
846 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
847 | } else { | |
848 | ret = SSL_srp_server_param_with_username(s, al); | |
849 | } | |
850 | } | |
851 | return ret; | |
852 | } | |
edc032b5 BL |
853 | #endif |
854 | ||
c536b6be | 855 | int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie, |
cb150cbc | 856 | size_t cookie_len) |
8ba708e5 | 857 | { |
8ba708e5 | 858 | /* Always use DTLS 1.0 version: see RFC 6347 */ |
c536b6be MC |
859 | if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION) |
860 | || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len)) | |
861 | return 0; | |
8ba708e5 | 862 | |
c536b6be | 863 | return 1; |
8ba708e5 MC |
864 | } |
865 | ||
7cea05dc | 866 | int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt) |
8ba708e5 | 867 | { |
cb150cbc | 868 | unsigned int cookie_leni; |
8ba708e5 MC |
869 | if (s->ctx->app_gen_cookie_cb == NULL || |
870 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
cb150cbc MC |
871 | &cookie_leni) == 0 || |
872 | cookie_leni > 255) { | |
f0659bdb | 873 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 874 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
8ba708e5 MC |
875 | return 0; |
876 | } | |
cb150cbc | 877 | s->d1->cookie_len = cookie_leni; |
8ba708e5 | 878 | |
4a01c59f MC |
879 | if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie, |
880 | s->d1->cookie_len)) { | |
c536b6be | 881 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR); |
c536b6be MC |
882 | return 0; |
883 | } | |
8ba708e5 | 884 | |
8ba708e5 MC |
885 | return 1; |
886 | } | |
887 | ||
be3583fa | 888 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
889 | { |
890 | int i, al = SSL_AD_INTERNAL_ERROR; | |
348240c6 | 891 | unsigned int j; |
1ab3836b | 892 | size_t loop; |
e27f234a | 893 | unsigned long id; |
4a640fb6 | 894 | const SSL_CIPHER *c; |
e27f234a MC |
895 | #ifndef OPENSSL_NO_COMP |
896 | SSL_COMP *comp = NULL; | |
897 | #endif | |
898 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
4fa52141 | 899 | int protverr; |
e27f234a | 900 | /* |cookie| will only be initialized for DTLS. */ |
1ab3836b | 901 | PACKET session_id, compression, extensions, cookie; |
6e3ff632 | 902 | static const unsigned char null_compression = 0; |
1ab3836b | 903 | CLIENTHELLO_MSG clienthello; |
e27f234a | 904 | |
1ab3836b | 905 | /* |
b1b4b543 | 906 | * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure. |
1ab3836b | 907 | */ |
9529419d | 908 | memset(&clienthello, 0, sizeof(clienthello)); |
1ab3836b | 909 | clienthello.isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
bbafa47b | 910 | PACKET_null_init(&cookie); |
1ab3836b MC |
911 | |
912 | if (clienthello.isv2) { | |
9ceb2426 | 913 | unsigned int mt; |
b1b4b543 | 914 | |
32ec4153 MC |
915 | /*- |
916 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
917 | * header is sent directly on the wire, not wrapped as a TLS | |
918 | * record. Our record layer just processes the message length and passes | |
919 | * the rest right through. Its format is: | |
920 | * Byte Content | |
921 | * 0-1 msg_length - decoded by the record layer | |
922 | * 2 msg_type - s->init_msg points here | |
923 | * 3-4 version | |
924 | * 5-6 cipher_spec_length | |
925 | * 7-8 session_id_length | |
926 | * 9-10 challenge_length | |
927 | * ... ... | |
928 | */ | |
929 | ||
73999b62 | 930 | if (!PACKET_get_1(pkt, &mt) |
a230b26e | 931 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
932 | /* |
933 | * Should never happen. We should have tested this in the record | |
934 | * layer in order to have determined that this is a SSLv2 record | |
935 | * in the first place | |
936 | */ | |
e27f234a | 937 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 938 | goto err; |
32ec4153 | 939 | } |
32ec4153 MC |
940 | } |
941 | ||
df7ce507 | 942 | if (!PACKET_get_net_2(pkt, &clienthello.legacy_version)) { |
1ab3836b MC |
943 | al = SSL_AD_DECODE_ERROR; |
944 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); | |
945 | goto err; | |
0f113f3e MC |
946 | } |
947 | ||
b3e2272c | 948 | /* Parse the message and load client random. */ |
1ab3836b | 949 | if (clienthello.isv2) { |
32ec4153 MC |
950 | /* |
951 | * Handle an SSLv2 backwards compatible ClientHello | |
952 | * Note, this is only for SSLv3+ using the backward compatible format. | |
e2994cf0 | 953 | * Real SSLv2 is not supported, and is rejected below. |
32ec4153 | 954 | */ |
1ab3836b | 955 | unsigned int ciphersuite_len, session_id_len, challenge_len; |
b3e2272c | 956 | PACKET challenge; |
0f113f3e | 957 | |
1ab3836b | 958 | if (!PACKET_get_net_2(pkt, &ciphersuite_len) |
a230b26e EK |
959 | || !PACKET_get_net_2(pkt, &session_id_len) |
960 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
961 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
962 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
963 | al = SSL_AD_DECODE_ERROR; |
964 | goto f_err; | |
5e9f0eeb | 965 | } |
0f113f3e | 966 | |
293b5ca4 AG |
967 | if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
968 | al = SSL_AD_DECODE_ERROR; | |
969 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
970 | goto f_err; | |
971 | } | |
972 | ||
1ab3836b MC |
973 | if (!PACKET_get_sub_packet(pkt, &clienthello.ciphersuites, |
974 | ciphersuite_len) | |
035b1e69 | 975 | || !PACKET_copy_bytes(pkt, clienthello.session_id, session_id_len) |
73999b62 | 976 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) |
b3e2272c | 977 | /* No extensions. */ |
73999b62 | 978 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
979 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
980 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
981 | al = SSL_AD_DECODE_ERROR; |
982 | goto f_err; | |
983 | } | |
035b1e69 | 984 | clienthello.session_id_len = session_id_len; |
9ceb2426 | 985 | |
fba7b84c MC |
986 | /* Load the client random and compression list. We use SSL3_RANDOM_SIZE |
987 | * here rather than sizeof(clienthello.random) because that is the limit | |
988 | * for SSLv3 and it is fixed. It won't change even if | |
989 | * sizeof(clienthello.random) does. | |
990 | */ | |
991 | challenge_len = challenge_len > SSL3_RANDOM_SIZE | |
992 | ? SSL3_RANDOM_SIZE : challenge_len; | |
993 | memset(clienthello.random, 0, SSL3_RANDOM_SIZE); | |
b3e2272c | 994 | if (!PACKET_copy_bytes(&challenge, |
fba7b84c | 995 | clienthello.random + SSL3_RANDOM_SIZE - |
cb21df32 DB |
996 | challenge_len, challenge_len) |
997 | /* Advertise only null compression. */ | |
998 | || !PACKET_buf_init(&compression, &null_compression, 1)) { | |
f0659bdb | 999 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1000 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1001 | goto f_err; |
1002 | } | |
b3e2272c | 1003 | |
1ab3836b | 1004 | PACKET_null_init(&clienthello.extensions); |
0f113f3e | 1005 | } else { |
b3e2272c | 1006 | /* Regular ClientHello. */ |
1ab3836b | 1007 | if (!PACKET_copy_bytes(pkt, clienthello.random, SSL3_RANDOM_SIZE) |
e2994cf0 MC |
1008 | || !PACKET_get_length_prefixed_1(pkt, &session_id) |
1009 | || !PACKET_copy_all(&session_id, clienthello.session_id, | |
1010 | SSL_MAX_SSL_SESSION_ID_LENGTH, | |
1011 | &clienthello.session_id_len)) { | |
9ceb2426 | 1012 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1013 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1014 | goto f_err; |
1015 | } | |
32ec4153 | 1016 | |
b3e2272c | 1017 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1018 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1019 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1020 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1021 | goto f_err; |
1022 | } | |
1ab3836b MC |
1023 | if (!PACKET_copy_all(&cookie, clienthello.dtls_cookie, |
1024 | DTLS1_COOKIE_LENGTH, | |
1025 | &clienthello.dtls_cookie_len)) { | |
1026 | al = SSL_AD_DECODE_ERROR; | |
1027 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1028 | goto f_err; | |
1029 | } | |
b3e2272c EK |
1030 | /* |
1031 | * If we require cookies and this ClientHello doesn't contain one, | |
1032 | * just return since we do not want to allocate any memory yet. | |
1033 | * So check cookie length... | |
1034 | */ | |
1035 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1ab3836b | 1036 | if (clienthello.dtls_cookie_len == 0) |
a230b26e | 1037 | return 1; |
b3e2272c | 1038 | } |
5e9f0eeb | 1039 | } |
0f113f3e | 1040 | |
1ab3836b MC |
1041 | if (!PACKET_get_length_prefixed_2(pkt, &clienthello.ciphersuites)) { |
1042 | al = SSL_AD_DECODE_ERROR; | |
1043 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1044 | goto f_err; | |
1045 | } | |
1046 | ||
4bfe1432 | 1047 | if (!PACKET_get_length_prefixed_1(pkt, &compression)) { |
a230b26e EK |
1048 | al = SSL_AD_DECODE_ERROR; |
1049 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1050 | goto f_err; | |
b3e2272c | 1051 | } |
1ab3836b | 1052 | |
b3e2272c | 1053 | /* Could be empty. */ |
1ab3836b MC |
1054 | if (PACKET_remaining(pkt) == 0) { |
1055 | PACKET_null_init(&clienthello.extensions); | |
1056 | } else { | |
1057 | if (!PACKET_get_length_prefixed_2(pkt, &clienthello.extensions)) { | |
1058 | al = SSL_AD_DECODE_ERROR; | |
1059 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1060 | goto f_err; | |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | ||
4bfe1432 | 1065 | if (!PACKET_copy_all(&compression, clienthello.compressions, |
e2994cf0 MC |
1066 | MAX_COMPRESSIONS_SIZE, |
1067 | &clienthello.compressions_len)) { | |
1ab3836b MC |
1068 | al = SSL_AD_DECODE_ERROR; |
1069 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1070 | goto f_err; | |
1071 | } | |
1072 | ||
b1b4b543 | 1073 | /* Preserve the raw extensions PACKET for later use */ |
1ab3836b | 1074 | extensions = clienthello.extensions; |
b1b4b543 | 1075 | if (!tls_collect_extensions(&extensions, &clienthello.pre_proc_exts, |
1ab3836b MC |
1076 | &clienthello.num_extensions, &al)) { |
1077 | /* SSLerr already been called */ | |
1078 | goto f_err; | |
1079 | } | |
1080 | ||
1081 | /* Finished parsing the ClientHello, now we can start processing it */ | |
1082 | ||
1083 | /* Set up the client_random */ | |
1084 | memcpy(s->s3->client_random, clienthello.random, SSL3_RANDOM_SIZE); | |
1085 | ||
1086 | /* Choose the version */ | |
1087 | ||
1088 | if (clienthello.isv2) { | |
df7ce507 MC |
1089 | if (clienthello.legacy_version == SSL2_VERSION |
1090 | || (clienthello.legacy_version & 0xff00) | |
b1b4b543 MC |
1091 | != (SSL3_VERSION_MAJOR << 8)) { |
1092 | /* | |
1093 | * This is real SSLv2 or something complete unknown. We don't | |
1094 | * support it. | |
1095 | */ | |
1ab3836b MC |
1096 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
1097 | goto err; | |
1098 | } | |
b1b4b543 | 1099 | /* SSLv3/TLS */ |
df7ce507 | 1100 | s->client_version = clienthello.legacy_version; |
1ab3836b MC |
1101 | } |
1102 | /* | |
1103 | * Do SSL/TLS version negotiation if applicable. For DTLS we just check | |
1104 | * versions are potentially compatible. Version negotiation comes later. | |
1105 | */ | |
1106 | if (!SSL_IS_DTLS(s)) { | |
1107 | protverr = ssl_choose_server_version(s, &clienthello); | |
1108 | } else if (s->method->version != DTLS_ANY_VERSION && | |
df7ce507 | 1109 | DTLS_VERSION_LT((int)clienthello.legacy_version, s->version)) { |
1ab3836b MC |
1110 | protverr = SSL_R_VERSION_TOO_LOW; |
1111 | } else { | |
1112 | protverr = 0; | |
1113 | } | |
1114 | ||
1115 | if (protverr) { | |
1116 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
1117 | if ((!s->enc_write_ctx && !s->write_hash)) { | |
b1b4b543 | 1118 | /* like ssl3_get_record, send alert using remote version number */ |
df7ce507 | 1119 | s->version = s->client_version = clienthello.legacy_version; |
1ab3836b MC |
1120 | } |
1121 | al = SSL_AD_PROTOCOL_VERSION; | |
1122 | goto f_err; | |
b3e2272c EK |
1123 | } |
1124 | ||
1ed65871 DB |
1125 | if (SSL_IS_DTLS(s)) { |
1126 | /* Empty cookie was already handled above by returning early. */ | |
1127 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1128 | if (s->ctx->app_verify_cookie_cb != NULL) { | |
1ab3836b MC |
1129 | if (s->ctx->app_verify_cookie_cb(s, clienthello.dtls_cookie, |
1130 | clienthello.dtls_cookie_len) == 0) { | |
1ed65871 DB |
1131 | al = SSL_AD_HANDSHAKE_FAILURE; |
1132 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, | |
1133 | SSL_R_COOKIE_MISMATCH); | |
1134 | goto f_err; | |
1135 | /* else cookie verification succeeded */ | |
1136 | } | |
a230b26e | 1137 | /* default verification */ |
1ab3836b MC |
1138 | } else if (s->d1->cookie_len != clienthello.dtls_cookie_len |
1139 | || memcmp(clienthello.dtls_cookie, s->d1->cookie, | |
1140 | s->d1->cookie_len) != 0) { | |
1ed65871 DB |
1141 | al = SSL_AD_HANDSHAKE_FAILURE; |
1142 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); | |
1143 | goto f_err; | |
1144 | } | |
1145 | s->d1->cookie_verified = 1; | |
1146 | } | |
1147 | if (s->method->version == DTLS_ANY_VERSION) { | |
1ab3836b | 1148 | protverr = ssl_choose_server_version(s, &clienthello); |
1ed65871 DB |
1149 | if (protverr != 0) { |
1150 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
1151 | s->version = s->client_version; | |
1152 | al = SSL_AD_PROTOCOL_VERSION; | |
1153 | goto f_err; | |
1154 | } | |
1155 | } | |
1156 | } | |
1157 | ||
b3e2272c EK |
1158 | s->hit = 0; |
1159 | ||
1ab3836b | 1160 | /* We need to do this before getting the session */ |
b1b4b543 | 1161 | if (!tls_check_client_ems_support(s, &clienthello)) { |
1ab3836b MC |
1162 | /* Only fails if the extension is malformed */ |
1163 | al = SSL_AD_DECODE_ERROR; | |
1164 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); | |
1165 | goto f_err; | |
1166 | } | |
1167 | ||
b3e2272c EK |
1168 | /* |
1169 | * We don't allow resumption in a backwards compatible ClientHello. | |
1170 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1171 | * | |
1172 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1173 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1174 | * ignore resumption requests with flag | |
1175 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1176 | * than a change to default behavior so that applications relying on | |
1177 | * this for security won't even compile against older library versions). | |
1178 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1179 | * request renegotiation but not a new session (s->new_session remains | |
1180 | * unset): for servers, this essentially just means that the | |
1181 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1182 | * ignored. | |
1183 | */ | |
1ab3836b | 1184 | if (clienthello.isv2 || |
b3e2272c EK |
1185 | (s->new_session && |
1186 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1187 | if (!ssl_get_new_session(s, 1)) | |
1188 | goto err; | |
1189 | } else { | |
1ab3836b | 1190 | i = ssl_get_prev_session(s, &clienthello); |
0f113f3e | 1191 | /* |
b3e2272c EK |
1192 | * Only resume if the session's version matches the negotiated |
1193 | * version. | |
1194 | * RFC 5246 does not provide much useful advice on resumption | |
1195 | * with a different protocol version. It doesn't forbid it but | |
1196 | * the sanity of such behaviour would be questionable. | |
1197 | * In practice, clients do not accept a version mismatch and | |
1198 | * will abort the handshake with an error. | |
0f113f3e | 1199 | */ |
b3e2272c EK |
1200 | if (i == 1 && s->version == s->session->ssl_version) { |
1201 | /* previous session */ | |
1202 | s->hit = 1; | |
1203 | } else if (i == -1) { | |
1204 | goto err; | |
32ec4153 | 1205 | } else { |
b3e2272c EK |
1206 | /* i == 0 */ |
1207 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1208 | goto err; |
0f113f3e | 1209 | } |
b3e2272c | 1210 | } |
0f113f3e | 1211 | |
b1b4b543 | 1212 | if (ssl_bytes_to_cipher_list(s, &clienthello.ciphersuites, &ciphers, |
1ab3836b | 1213 | clienthello.isv2, &al) == NULL) { |
b3e2272c EK |
1214 | goto f_err; |
1215 | } | |
5e9f0eeb | 1216 | |
b3e2272c EK |
1217 | /* If it is a hit, check that the cipher is in the list */ |
1218 | if (s->hit) { | |
1219 | j = 0; | |
1220 | id = s->session->cipher->id; | |
d02b48c6 | 1221 | |
413c4f45 | 1222 | #ifdef CIPHER_DEBUG |
a230b26e | 1223 | fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers)); |
413c4f45 | 1224 | #endif |
b3e2272c EK |
1225 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1226 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1227 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1228 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1229 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1230 | #endif |
b3e2272c EK |
1231 | if (c->id == id) { |
1232 | j = 1; | |
1233 | break; | |
32ec4153 | 1234 | } |
0f113f3e | 1235 | } |
b3e2272c | 1236 | if (j == 0) { |
ec30e856 | 1237 | /* |
b3e2272c EK |
1238 | * we need to have the cipher in the cipher list if we are asked |
1239 | * to reuse it | |
ec30e856 | 1240 | */ |
b3e2272c | 1241 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1242 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1243 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1244 | goto f_err; |
1245 | } | |
b3e2272c | 1246 | } |
9ceb2426 | 1247 | |
1ab3836b MC |
1248 | for (loop = 0; loop < clienthello.compressions_len; loop++) { |
1249 | if (clienthello.compressions[loop] == 0) | |
b3e2272c | 1250 | break; |
0f113f3e | 1251 | } |
32ec4153 | 1252 | |
1ab3836b | 1253 | if (loop >= clienthello.compressions_len) { |
b3e2272c EK |
1254 | /* no compress */ |
1255 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1256 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1257 | goto f_err; |
1258 | } | |
f100b031 | 1259 | |
0f113f3e | 1260 | /* TLS extensions */ |
1ab3836b MC |
1261 | if (!ssl_parse_clienthello_tlsext(s, &clienthello)) { |
1262 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); | |
1263 | goto err; | |
0f113f3e MC |
1264 | } |
1265 | ||
1266 | /* | |
1267 | * Check if we want to use external pre-shared secret for this handshake | |
1268 | * for not reused session only. We need to generate server_random before | |
1269 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1270 | * processing to use it in key derivation. | |
1271 | */ | |
1272 | { | |
1273 | unsigned char *pos; | |
1274 | pos = s->s3->server_random; | |
1275 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1276 | goto f_err; | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) { | |
4a640fb6 | 1281 | const SSL_CIPHER *pref_cipher = NULL; |
8c1a5343 MC |
1282 | /* |
1283 | * s->session->master_key_length is a size_t, but this is an int for | |
1284 | * backwards compat reasons | |
1285 | */ | |
1286 | int master_key_length; | |
0f113f3e | 1287 | |
8c1a5343 | 1288 | master_key_length = sizeof(s->session->master_key); |
0f113f3e | 1289 | if (s->tls_session_secret_cb(s, s->session->master_key, |
8c1a5343 | 1290 | &master_key_length, ciphers, |
0f113f3e | 1291 | &pref_cipher, |
8c1a5343 MC |
1292 | s->tls_session_secret_cb_arg) |
1293 | && master_key_length > 0) { | |
1294 | s->session->master_key_length = master_key_length; | |
0f113f3e MC |
1295 | s->hit = 1; |
1296 | s->session->ciphers = ciphers; | |
1297 | s->session->verify_result = X509_V_OK; | |
1298 | ||
1299 | ciphers = NULL; | |
1300 | ||
1301 | /* check if some cipher was preferred by call back */ | |
1302 | pref_cipher = | |
1303 | pref_cipher ? pref_cipher : ssl3_choose_cipher(s, | |
1304 | s-> | |
1305 | session->ciphers, | |
1306 | SSL_get_ciphers | |
1307 | (s)); | |
1308 | if (pref_cipher == NULL) { | |
1309 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1310 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1311 | goto f_err; |
1312 | } | |
1313 | ||
1314 | s->session->cipher = pref_cipher; | |
25aaa98a | 1315 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1316 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1317 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1318 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1319 | } | |
1320 | } | |
58ece833 | 1321 | |
0f113f3e MC |
1322 | /* |
1323 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1324 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1325 | * algorithms from the client, starting at q. |
1326 | */ | |
1327 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1328 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1329 | /* This only happens if we have a cache hit */ |
1330 | if (s->session->compress_meth != 0) { | |
1331 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1332 | unsigned int k; |
0f113f3e MC |
1333 | /* Perform sanity checks on resumed compression algorithm */ |
1334 | /* Can't disable compression */ | |
1335 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1336 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1337 | SSL_R_INCONSISTENT_COMPRESSION); |
1338 | goto f_err; | |
1339 | } | |
1340 | /* Look for resumed compression method */ | |
1341 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1342 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1343 | if (comp_id == comp->id) { | |
1344 | s->s3->tmp.new_compression = comp; | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1349 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1350 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1351 | goto f_err; | |
1352 | } | |
1353 | /* Look for resumed method in compression list */ | |
1ab3836b MC |
1354 | for (k = 0; k < clienthello.compressions_len; k++) { |
1355 | if (clienthello.compressions[k] == comp_id) | |
0f113f3e MC |
1356 | break; |
1357 | } | |
1ab3836b | 1358 | if (k >= clienthello.compressions_len) { |
0f113f3e | 1359 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1360 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
8fdc99cb | 1361 | SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING); |
0f113f3e MC |
1362 | goto f_err; |
1363 | } | |
1364 | } else if (s->hit) | |
1365 | comp = NULL; | |
1366 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1367 | /* See if we have a match */ |
9ceb2426 MC |
1368 | int m, nn, v, done = 0; |
1369 | unsigned int o; | |
0f113f3e MC |
1370 | |
1371 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1372 | for (m = 0; m < nn; m++) { | |
1373 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1374 | v = comp->id; | |
1ab3836b MC |
1375 | for (o = 0; o < clienthello.compressions_len; o++) { |
1376 | if (v == clienthello.compressions[o]) { | |
0f113f3e MC |
1377 | done = 1; |
1378 | break; | |
1379 | } | |
1380 | } | |
1381 | if (done) | |
1382 | break; | |
1383 | } | |
1384 | if (done) | |
1385 | s->s3->tmp.new_compression = comp; | |
1386 | else | |
1387 | comp = NULL; | |
1388 | } | |
e6f418bc | 1389 | #else |
0f113f3e MC |
1390 | /* |
1391 | * If compression is disabled we'd better not try to resume a session | |
1392 | * using compression. | |
1393 | */ | |
1394 | if (s->session->compress_meth != 0) { | |
e27f234a | 1395 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1396 | goto f_err; |
1397 | } | |
09b6c2ef | 1398 | #endif |
413c4f45 | 1399 | |
0f113f3e MC |
1400 | /* |
1401 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1402 | */ | |
d02b48c6 | 1403 | |
0f113f3e | 1404 | if (!s->hit) { |
09b6c2ef | 1405 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1406 | s->session->compress_meth = 0; |
09b6c2ef | 1407 | #else |
0f113f3e | 1408 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1409 | #endif |
25aaa98a | 1410 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1411 | s->session->ciphers = ciphers; |
1412 | if (ciphers == NULL) { | |
3ae91cfb | 1413 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1414 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1415 | goto f_err; |
1416 | } | |
1417 | ciphers = NULL; | |
1418 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1419 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1420 | goto err; |
1421 | } | |
e27f234a MC |
1422 | } |
1423 | ||
1424 | sk_SSL_CIPHER_free(ciphers); | |
9529419d | 1425 | OPENSSL_free(clienthello.pre_proc_exts); |
e27f234a MC |
1426 | return MSG_PROCESS_CONTINUE_PROCESSING; |
1427 | f_err: | |
1428 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1429 | err: | |
fe3a3291 | 1430 | ossl_statem_set_error(s); |
e27f234a MC |
1431 | |
1432 | sk_SSL_CIPHER_free(ciphers); | |
9529419d | 1433 | OPENSSL_free(clienthello.pre_proc_exts); |
e27f234a | 1434 | |
58c9e32a | 1435 | return MSG_PROCESS_ERROR; |
e27f234a MC |
1436 | } |
1437 | ||
be3583fa | 1438 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1439 | { |
d13dd4be | 1440 | int al = SSL_AD_HANDSHAKE_FAILURE; |
4a640fb6 | 1441 | const SSL_CIPHER *cipher; |
e27f234a MC |
1442 | |
1443 | if (wst == WORK_MORE_A) { | |
1444 | if (!s->hit) { | |
1445 | /* Let cert callback update server certificates if required */ | |
1446 | if (s->cert->cert_cb) { | |
1447 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1448 | if (rv == 0) { | |
1449 | al = SSL_AD_INTERNAL_ERROR; | |
a230b26e EK |
1450 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1451 | SSL_R_CERT_CB_ERROR); | |
e27f234a MC |
1452 | goto f_err; |
1453 | } | |
1454 | if (rv < 0) { | |
1455 | s->rwstate = SSL_X509_LOOKUP; | |
1456 | return WORK_MORE_A; | |
1457 | } | |
1458 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1459 | } |
a230b26e EK |
1460 | cipher = |
1461 | ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); | |
e27f234a MC |
1462 | |
1463 | if (cipher == NULL) { | |
a230b26e EK |
1464 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1465 | SSL_R_NO_SHARED_CIPHER); | |
e27f234a | 1466 | goto f_err; |
0f113f3e | 1467 | } |
e27f234a MC |
1468 | s->s3->tmp.new_cipher = cipher; |
1469 | /* check whether we should disable session resumption */ | |
1470 | if (s->not_resumable_session_cb != NULL) | |
1471 | s->session->not_resumable = s->not_resumable_session_cb(s, | |
a230b26e | 1472 | ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0)); |
e27f234a MC |
1473 | if (s->session->not_resumable) |
1474 | /* do not send a session ticket */ | |
1475 | s->tlsext_ticket_expected = 0; | |
1476 | } else { | |
1477 | /* Session-id reuse */ | |
1478 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1479 | } |
0f113f3e | 1480 | |
28f4580c | 1481 | if (!(s->verify_mode & SSL_VERIFY_PEER)) { |
d13dd4be MC |
1482 | if (!ssl3_digest_cached_records(s, 0)) { |
1483 | al = SSL_AD_INTERNAL_ERROR; | |
e27f234a | 1484 | goto f_err; |
d13dd4be | 1485 | } |
0f113f3e | 1486 | } |
0f113f3e | 1487 | |
e27f234a MC |
1488 | /*- |
1489 | * we now have the following setup. | |
1490 | * client_random | |
60250017 | 1491 | * cipher_list - our preferred list of ciphers |
1492 | * ciphers - the clients preferred list of ciphers | |
e27f234a MC |
1493 | * compression - basically ignored right now |
1494 | * ssl version is set - sslv3 | |
1495 | * s->session - The ssl session has been setup. | |
1496 | * s->hit - session reuse flag | |
1497 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1498 | */ | |
0f113f3e | 1499 | |
e27f234a MC |
1500 | /* Handles TLS extensions that we couldn't check earlier */ |
1501 | if (s->version >= SSL3_VERSION) { | |
70c22888 | 1502 | if (!ssl_check_clienthello_tlsext_late(s, &al)) { |
d13dd4be MC |
1503 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1504 | SSL_R_CLIENTHELLO_TLSEXT); | |
e27f234a MC |
1505 | goto f_err; |
1506 | } | |
1507 | } | |
0f113f3e | 1508 | |
e27f234a MC |
1509 | wst = WORK_MORE_B; |
1510 | } | |
1511 | #ifndef OPENSSL_NO_SRP | |
1512 | if (wst == WORK_MORE_B) { | |
1513 | int ret; | |
1514 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1515 | /* | |
1516 | * callback indicates further work to be done | |
1517 | */ | |
1518 | s->rwstate = SSL_X509_LOOKUP; | |
1519 | return WORK_MORE_B; | |
1520 | } | |
1521 | if (ret != SSL_ERROR_NONE) { | |
1522 | /* | |
1523 | * This is not really an error but the only means to for | |
1524 | * a client to detect whether srp is supported. | |
1525 | */ | |
1526 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1527 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
a230b26e | 1528 | SSL_R_CLIENTHELLO_TLSEXT); |
e27f234a | 1529 | goto f_err; |
0f113f3e MC |
1530 | } |
1531 | } | |
e27f234a MC |
1532 | #endif |
1533 | s->renegotiate = 2; | |
0f113f3e | 1534 | |
e27f234a | 1535 | return WORK_FINISHED_STOP; |
0f113f3e | 1536 | f_err: |
e27f234a | 1537 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1538 | ossl_statem_set_error(s); |
e27f234a MC |
1539 | return WORK_ERROR; |
1540 | } | |
1541 | ||
7cea05dc | 1542 | int tls_construct_server_hello(SSL *s, WPACKET *pkt) |
0f113f3e | 1543 | { |
ec60ccc1 MC |
1544 | int compm, al = SSL_AD_INTERNAL_ERROR; |
1545 | size_t sl, len; | |
0f113f3e | 1546 | |
5923ad4b | 1547 | if (!WPACKET_put_bytes_u16(pkt, s->version) |
8157d44b MC |
1548 | /* |
1549 | * Random stuff. Filling of the server_random takes place in | |
1550 | * tls_process_client_hello() | |
1551 | */ | |
7cea05dc | 1552 | || !WPACKET_memcpy(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) { |
8157d44b MC |
1553 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
1554 | goto err; | |
1555 | } | |
0f113f3e | 1556 | |
e27f234a MC |
1557 | /*- |
1558 | * There are several cases for the session ID to send | |
1559 | * back in the server hello: | |
1560 | * - For session reuse from the session cache, | |
1561 | * we send back the old session ID. | |
1562 | * - If stateless session reuse (using a session ticket) | |
1563 | * is successful, we send back the client's "session ID" | |
1564 | * (which doesn't actually identify the session). | |
1565 | * - If it is a new session, we send back the new | |
1566 | * session ID. | |
1567 | * - However, if we want the new session to be single-use, | |
1568 | * we send back a 0-length session ID. | |
1569 | * s->hit is non-zero in either case of session reuse, | |
1570 | * so the following won't overwrite an ID that we're supposed | |
1571 | * to send back. | |
1572 | */ | |
1573 | if (s->session->not_resumable || | |
1574 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1575 | && !s->hit)) | |
1576 | s->session->session_id_length = 0; | |
1577 | ||
1578 | sl = s->session->session_id_length; | |
ec60ccc1 | 1579 | if (sl > sizeof(s->session->session_id)) { |
e27f234a | 1580 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
8157d44b | 1581 | goto err; |
e27f234a | 1582 | } |
0f113f3e | 1583 | |
8157d44b | 1584 | /* set up the compression method */ |
09b6c2ef | 1585 | #ifdef OPENSSL_NO_COMP |
8157d44b | 1586 | compm = 0; |
09b6c2ef | 1587 | #else |
e27f234a | 1588 | if (s->s3->tmp.new_compression == NULL) |
8157d44b | 1589 | compm = 0; |
e27f234a | 1590 | else |
8157d44b | 1591 | compm = s->s3->tmp.new_compression->id; |
09b6c2ef | 1592 | #endif |
e481f9b9 | 1593 | |
7cea05dc MC |
1594 | if (!WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl) |
1595 | || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len) | |
1596 | || !WPACKET_put_bytes_u8(pkt, compm) | |
8157d44b | 1597 | || !ssl_prepare_serverhello_tlsext(s) |
5923ad4b | 1598 | || !ssl_add_serverhello_tlsext(s, pkt, &al)) { |
e27f234a | 1599 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
8157d44b | 1600 | goto err; |
0f113f3e | 1601 | } |
d02b48c6 | 1602 | |
e27f234a | 1603 | return 1; |
8157d44b | 1604 | err: |
8157d44b | 1605 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
8157d44b | 1606 | return 0; |
0f113f3e | 1607 | } |
d02b48c6 | 1608 | |
7cea05dc | 1609 | int tls_construct_server_done(SSL *s, WPACKET *pkt) |
e27f234a | 1610 | { |
e27f234a | 1611 | if (!s->s3->tmp.cert_request) { |
5923ad4b MC |
1612 | if (!ssl3_digest_cached_records(s, 0)) { |
1613 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
1614 | return 0; | |
1615 | } | |
e27f234a | 1616 | } |
e27f234a MC |
1617 | return 1; |
1618 | } | |
1619 | ||
7cea05dc | 1620 | int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt) |
0f113f3e | 1621 | { |
bc36ee62 | 1622 | #ifndef OPENSSL_NO_DH |
e2b420fd | 1623 | EVP_PKEY *pkdh = NULL; |
ea262260 | 1624 | #endif |
10bf4fc2 | 1625 | #ifndef OPENSSL_NO_EC |
0f113f3e | 1626 | unsigned char *encodedPoint = NULL; |
348240c6 | 1627 | size_t encodedlen = 0; |
0f113f3e | 1628 | int curve_id = 0; |
d02b48c6 | 1629 | #endif |
0f113f3e MC |
1630 | EVP_PKEY *pkey; |
1631 | const EVP_MD *md = NULL; | |
c13d2a5b | 1632 | int al = SSL_AD_INTERNAL_ERROR, i; |
0f113f3e | 1633 | unsigned long type; |
2ac6115d | 1634 | const BIGNUM *r[4]; |
bfb0641f | 1635 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
c13d2a5b MC |
1636 | size_t paramlen, paramoffset; |
1637 | ||
5923ad4b | 1638 | if (!WPACKET_get_total_written(pkt, ¶moffset)) { |
e4e1aa90 | 1639 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
c13d2a5b MC |
1640 | goto f_err; |
1641 | } | |
0f113f3e | 1642 | |
6e59a892 RL |
1643 | if (md_ctx == NULL) { |
1644 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
6e59a892 RL |
1645 | goto f_err; |
1646 | } | |
0f113f3e | 1647 | |
e27f234a | 1648 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a | 1649 | |
e27f234a | 1650 | r[0] = r[1] = r[2] = r[3] = NULL; |
85269210 | 1651 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
1652 | /* Plain PSK or RSAPSK nothing to do */ |
1653 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
1654 | } else | |
85269210 | 1655 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 1656 | #ifndef OPENSSL_NO_DH |
e27f234a | 1657 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
1658 | CERT *cert = s->cert; |
1659 | ||
e2b420fd DSH |
1660 | EVP_PKEY *pkdhp = NULL; |
1661 | DH *dh; | |
1662 | ||
e27f234a | 1663 | if (s->cert->dh_tmp_auto) { |
e2b420fd DSH |
1664 | DH *dhp = ssl_get_auto_dh(s); |
1665 | pkdh = EVP_PKEY_new(); | |
1666 | if (pkdh == NULL || dhp == NULL) { | |
1667 | DH_free(dhp); | |
e27f234a | 1668 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
0f113f3e | 1669 | ERR_R_INTERNAL_ERROR); |
e27f234a | 1670 | goto f_err; |
0f113f3e | 1671 | } |
e2b420fd DSH |
1672 | EVP_PKEY_assign_DH(pkdh, dhp); |
1673 | pkdhp = pkdh; | |
1674 | } else { | |
1675 | pkdhp = cert->dh_tmp; | |
1676 | } | |
1677 | if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { | |
1678 | DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); | |
1679 | pkdh = ssl_dh_to_pkey(dhp); | |
1680 | if (pkdh == NULL) { | |
e2b420fd DSH |
1681 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1682 | ERR_R_INTERNAL_ERROR); | |
1683 | goto f_err; | |
1684 | } | |
1685 | pkdhp = pkdh; | |
1686 | } | |
1687 | if (pkdhp == NULL) { | |
e27f234a MC |
1688 | al = SSL_AD_HANDSHAKE_FAILURE; |
1689 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1690 | SSL_R_MISSING_TMP_DH_KEY); | |
1691 | goto f_err; | |
1692 | } | |
1693 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
e2b420fd | 1694 | EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { |
e27f234a MC |
1695 | al = SSL_AD_HANDSHAKE_FAILURE; |
1696 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1697 | SSL_R_DH_KEY_TOO_SMALL); | |
1698 | goto f_err; | |
1699 | } | |
e2b420fd | 1700 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1701 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1702 | ERR_R_INTERNAL_ERROR); | |
1703 | goto err; | |
1704 | } | |
0f113f3e | 1705 | |
0a699a07 | 1706 | s->s3->tmp.pkey = ssl_generate_pkey(pkdhp); |
e27f234a | 1707 | |
e2b420fd DSH |
1708 | if (s->s3->tmp.pkey == NULL) { |
1709 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
ffaef3f1 | 1710 | goto err; |
e27f234a | 1711 | } |
e2b420fd DSH |
1712 | |
1713 | dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); | |
1714 | ||
1715 | EVP_PKEY_free(pkdh); | |
1716 | pkdh = NULL; | |
1717 | ||
0aeddcfa MC |
1718 | DH_get0_pqg(dh, &r[0], NULL, &r[1]); |
1719 | DH_get0_key(dh, &r[2], NULL); | |
e27f234a | 1720 | } else |
d02b48c6 | 1721 | #endif |
10bf4fc2 | 1722 | #ifndef OPENSSL_NO_EC |
e27f234a | 1723 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 1724 | int nid; |
e27f234a | 1725 | |
880d9d86 | 1726 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
1727 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1728 | ERR_R_INTERNAL_ERROR); | |
1729 | goto err; | |
1730 | } | |
1731 | ||
57be4444 DSH |
1732 | /* Get NID of appropriate shared curve */ |
1733 | nid = tls1_shared_curve(s, -2); | |
1734 | curve_id = tls1_ec_nid2curve_id(nid); | |
1735 | if (curve_id == 0) { | |
e27f234a MC |
1736 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1737 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
1738 | goto err; | |
1739 | } | |
0a699a07 | 1740 | s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id); |
880d9d86 DSH |
1741 | /* Generate a new key for this curve */ |
1742 | if (s->s3->tmp.pkey == NULL) { | |
880d9d86 | 1743 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
1744 | goto f_err; |
1745 | } | |
1746 | ||
880d9d86 | 1747 | /* Encode the public key. */ |
ec24630a DSH |
1748 | encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey, |
1749 | &encodedPoint); | |
e27f234a | 1750 | if (encodedlen == 0) { |
cae41364 | 1751 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
1752 | goto err; |
1753 | } | |
0f113f3e | 1754 | |
e27f234a MC |
1755 | /* |
1756 | * We'll generate the serverKeyExchange message explicitly so we | |
1757 | * can set these to NULLs | |
1758 | */ | |
1759 | r[0] = NULL; | |
1760 | r[1] = NULL; | |
1761 | r[2] = NULL; | |
1762 | r[3] = NULL; | |
1763 | } else | |
10bf4fc2 | 1764 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 1765 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
1766 | if (type & SSL_kSRP) { |
1767 | if ((s->srp_ctx.N == NULL) || | |
1768 | (s->srp_ctx.g == NULL) || | |
1769 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
1770 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1771 | SSL_R_MISSING_SRP_PARAM); | |
1772 | goto err; | |
0f113f3e | 1773 | } |
e27f234a MC |
1774 | r[0] = s->srp_ctx.N; |
1775 | r[1] = s->srp_ctx.g; | |
1776 | r[2] = s->srp_ctx.s; | |
1777 | r[3] = s->srp_ctx.B; | |
1778 | } else | |
1779 | #endif | |
1780 | { | |
1781 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1782 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1783 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
1784 | goto f_err; | |
1785 | } | |
0f113f3e | 1786 | |
a230b26e | 1787 | if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) |
e27f234a MC |
1788 | && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { |
1789 | if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md)) | |
1790 | == NULL) { | |
1791 | al = SSL_AD_DECODE_ERROR; | |
1792 | goto f_err; | |
0f113f3e | 1793 | } |
e27f234a MC |
1794 | } else { |
1795 | pkey = NULL; | |
e27f234a | 1796 | } |
0f113f3e | 1797 | |
85269210 | 1798 | #ifndef OPENSSL_NO_PSK |
e27f234a | 1799 | if (type & SSL_PSK) { |
c13d2a5b MC |
1800 | size_t len = (s->cert->psk_identity_hint == NULL) |
1801 | ? 0 : strlen(s->cert->psk_identity_hint); | |
1802 | ||
1803 | /* | |
1804 | * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already | |
1805 | * checked this when we set the identity hint - but just in case | |
1806 | */ | |
1807 | if (len > PSK_MAX_IDENTITY_LEN | |
7cea05dc | 1808 | || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint, |
c13d2a5b MC |
1809 | len)) { |
1810 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1811 | ERR_R_INTERNAL_ERROR); | |
1812 | goto f_err; | |
85269210 | 1813 | } |
e27f234a | 1814 | } |
85269210 DSH |
1815 | #endif |
1816 | ||
e27f234a | 1817 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
c13d2a5b MC |
1818 | unsigned char *binval; |
1819 | int res; | |
1820 | ||
edc032b5 | 1821 | #ifndef OPENSSL_NO_SRP |
e27f234a | 1822 | if ((i == 2) && (type & SSL_kSRP)) { |
7cea05dc | 1823 | res = WPACKET_start_sub_packet_u8(pkt); |
e27f234a | 1824 | } else |
78a01b3f | 1825 | #endif |
7cea05dc | 1826 | res = WPACKET_start_sub_packet_u16(pkt); |
c13d2a5b MC |
1827 | |
1828 | if (!res) { | |
1829 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1830 | ERR_R_INTERNAL_ERROR); | |
1831 | goto f_err; | |
1832 | } | |
1833 | ||
78a01b3f | 1834 | #ifndef OPENSSL_NO_DH |
a230b26e | 1835 | /*- |
78a01b3f | 1836 | * for interoperability with some versions of the Microsoft TLS |
1837 | * stack, we need to zero pad the DHE pub key to the same length | |
1838 | * as the prime | |
1839 | */ | |
1840 | if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) { | |
c13d2a5b | 1841 | size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]); |
ff819477 | 1842 | |
c13d2a5b | 1843 | if (len > 0) { |
7cea05dc | 1844 | if (!WPACKET_allocate_bytes(pkt, len, &binval)) { |
c13d2a5b MC |
1845 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1846 | ERR_R_INTERNAL_ERROR); | |
1847 | goto f_err; | |
1848 | } | |
1849 | memset(binval, 0, len); | |
78a01b3f | 1850 | } |
c13d2a5b | 1851 | } |
edc032b5 | 1852 | #endif |
7cea05dc MC |
1853 | if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval) |
1854 | || !WPACKET_close(pkt)) { | |
c13d2a5b MC |
1855 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1856 | ERR_R_INTERNAL_ERROR); | |
1857 | goto f_err; | |
1858 | } | |
1859 | ||
1860 | BN_bn2bin(r[i], binval); | |
e27f234a | 1861 | } |
d02b48c6 | 1862 | |
10bf4fc2 | 1863 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
1864 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
1865 | /* | |
c13d2a5b MC |
1866 | * We only support named (not generic) curves. In this situation, the |
1867 | * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName] | |
1868 | * [1 byte length of encoded point], followed by the actual encoded | |
1869 | * point itself | |
e27f234a | 1870 | */ |
7cea05dc MC |
1871 | if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE) |
1872 | || !WPACKET_put_bytes_u8(pkt, 0) | |
1873 | || !WPACKET_put_bytes_u8(pkt, curve_id) | |
1874 | || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) { | |
c13d2a5b MC |
1875 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1876 | ERR_R_INTERNAL_ERROR); | |
1877 | goto f_err; | |
1878 | } | |
e27f234a MC |
1879 | OPENSSL_free(encodedPoint); |
1880 | encodedPoint = NULL; | |
e27f234a | 1881 | } |
ea262260 BM |
1882 | #endif |
1883 | ||
e27f234a MC |
1884 | /* not anonymous */ |
1885 | if (pkey != NULL) { | |
1886 | /* | |
1887 | * n is the length of the params, they start at &(d[4]) and p | |
1888 | * points to the space at the end. | |
1889 | */ | |
e27f234a | 1890 | if (md) { |
c13d2a5b MC |
1891 | unsigned char *sigbytes1, *sigbytes2; |
1892 | unsigned int siglen; | |
1893 | ||
1894 | /* Get length of the parameters we have written above */ | |
7cea05dc | 1895 | if (!WPACKET_get_length(pkt, ¶mlen)) { |
c13d2a5b MC |
1896 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1897 | ERR_R_INTERNAL_ERROR); | |
1898 | goto f_err; | |
1899 | } | |
e27f234a MC |
1900 | /* send signature algorithm */ |
1901 | if (SSL_USE_SIGALGS(s)) { | |
7cea05dc | 1902 | if (!tls12_get_sigandhash(pkt, pkey, md)) { |
e27f234a | 1903 | /* Should never happen */ |
e27f234a MC |
1904 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1905 | ERR_R_INTERNAL_ERROR); | |
1906 | goto f_err; | |
0f113f3e | 1907 | } |
e27f234a | 1908 | } |
a2f9200f | 1909 | #ifdef SSL_DEBUG |
e27f234a | 1910 | fprintf(stderr, "Using hash %s\n", EVP_MD_name(md)); |
a2f9200f | 1911 | #endif |
c13d2a5b MC |
1912 | /* |
1913 | * Create the signature. We don't know the actual length of the sig | |
1914 | * until after we've created it, so we reserve enough bytes for it | |
1915 | * up front, and then properly allocate them in the WPACKET | |
1916 | * afterwards. | |
1917 | */ | |
7cea05dc | 1918 | if (!WPACKET_sub_reserve_bytes_u16(pkt, EVP_PKEY_size(pkey), |
c13d2a5b MC |
1919 | &sigbytes1) |
1920 | || EVP_SignInit_ex(md_ctx, md, NULL) <= 0 | |
1921 | || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]), | |
1922 | SSL3_RANDOM_SIZE) <= 0 | |
1923 | || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]), | |
1924 | SSL3_RANDOM_SIZE) <= 0 | |
1925 | || EVP_SignUpdate(md_ctx, s->init_buf->data + paramoffset, | |
1926 | paramlen) <= 0 | |
1927 | || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0 | |
7cea05dc | 1928 | || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2) |
c13d2a5b MC |
1929 | || sigbytes1 != sigbytes2) { |
1930 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
1931 | ERR_R_INTERNAL_ERROR); | |
5f3d93e4 | 1932 | goto f_err; |
0f113f3e | 1933 | } |
e27f234a MC |
1934 | } else { |
1935 | /* Is this error check actually needed? */ | |
77d514c5 | 1936 | al = SSL_AD_HANDSHAKE_FAILURE; |
e27f234a MC |
1937 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
1938 | SSL_R_UNKNOWN_PKEY_TYPE); | |
77d514c5 MC |
1939 | goto f_err; |
1940 | } | |
0f113f3e MC |
1941 | } |
1942 | ||
bfb0641f | 1943 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 1944 | return 1; |
0f113f3e MC |
1945 | f_err: |
1946 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1947 | err: | |
e2b420fd DSH |
1948 | #ifndef OPENSSL_NO_DH |
1949 | EVP_PKEY_free(pkdh); | |
1950 | #endif | |
556efe79 | 1951 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 1952 | OPENSSL_free(encodedPoint); |
ea262260 | 1953 | #endif |
bfb0641f | 1954 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 1955 | return 0; |
0f113f3e | 1956 | } |
d02b48c6 | 1957 | |
7cea05dc | 1958 | int tls_construct_certificate_request(SSL *s, WPACKET *pkt) |
0f113f3e | 1959 | { |
348240c6 | 1960 | int i; |
0f113f3e | 1961 | STACK_OF(X509_NAME) *sk = NULL; |
0f113f3e | 1962 | |
e27f234a | 1963 | /* get the list of acceptable cert types */ |
7cea05dc MC |
1964 | if (!WPACKET_start_sub_packet_u8(pkt) |
1965 | || !ssl3_get_req_cert_type(s, pkt) | |
1966 | || !WPACKET_close(pkt)) { | |
28ff8ef3 MC |
1967 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
1968 | goto err; | |
1969 | } | |
0f113f3e | 1970 | |
e27f234a MC |
1971 | if (SSL_USE_SIGALGS(s)) { |
1972 | const unsigned char *psigs; | |
348240c6 | 1973 | size_t nl = tls12_get_psigalgs(s, &psigs); |
7cea05dc MC |
1974 | if (!WPACKET_start_sub_packet_u16(pkt) |
1975 | || !tls12_copy_sigalgs(s, pkt, psigs, nl) | |
1976 | || !WPACKET_close(pkt)) { | |
28ff8ef3 MC |
1977 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, |
1978 | ERR_R_INTERNAL_ERROR); | |
1979 | goto err; | |
1980 | } | |
e27f234a | 1981 | } |
0f113f3e | 1982 | |
28ff8ef3 | 1983 | /* Start sub-packet for client CA list */ |
7cea05dc | 1984 | if (!WPACKET_start_sub_packet_u16(pkt)) { |
28ff8ef3 MC |
1985 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
1986 | goto err; | |
1987 | } | |
e27f234a MC |
1988 | |
1989 | sk = SSL_get_client_CA_list(s); | |
e27f234a MC |
1990 | if (sk != NULL) { |
1991 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
28ff8ef3 MC |
1992 | unsigned char *namebytes; |
1993 | X509_NAME *name = sk_X509_NAME_value(sk, i); | |
1994 | int namelen; | |
1995 | ||
1996 | if (name == NULL | |
1997 | || (namelen = i2d_X509_NAME(name, NULL)) < 0 | |
7cea05dc | 1998 | || !WPACKET_sub_allocate_bytes_u16(pkt, namelen, |
28ff8ef3 MC |
1999 | &namebytes) |
2000 | || i2d_X509_NAME(name, &namebytes) != namelen) { | |
2001 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2002 | ERR_R_INTERNAL_ERROR); | |
e27f234a | 2003 | goto err; |
0f113f3e MC |
2004 | } |
2005 | } | |
e27f234a MC |
2006 | } |
2007 | /* else no CA names */ | |
d02b48c6 | 2008 | |
5923ad4b | 2009 | if (!WPACKET_close(pkt)) { |
e27f234a MC |
2010 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
2011 | goto err; | |
0f113f3e | 2012 | } |
d02b48c6 | 2013 | |
e27f234a MC |
2014 | s->s3->tmp.cert_request = 1; |
2015 | ||
2016 | return 1; | |
0f113f3e | 2017 | err: |
28ff8ef3 | 2018 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
e27f234a | 2019 | return 0; |
0f113f3e | 2020 | } |
d02b48c6 | 2021 | |
0907d710 | 2022 | static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al) |
e27f234a | 2023 | { |
85269210 | 2024 | #ifndef OPENSSL_NO_PSK |
0907d710 MC |
2025 | unsigned char psk[PSK_MAX_PSK_LEN]; |
2026 | size_t psklen; | |
2027 | PACKET psk_identity; | |
efcdbcbe | 2028 | |
0907d710 MC |
2029 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
2030 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2031 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH); |
0907d710 MC |
2032 | return 0; |
2033 | } | |
2034 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { | |
2035 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2036 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG); |
0907d710 MC |
2037 | return 0; |
2038 | } | |
2039 | if (s->psk_server_callback == NULL) { | |
2040 | *al = SSL_AD_INTERNAL_ERROR; | |
a230b26e | 2041 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB); |
0907d710 MC |
2042 | return 0; |
2043 | } | |
85269210 | 2044 | |
0907d710 MC |
2045 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
2046 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2047 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2048 | return 0; |
2049 | } | |
85269210 | 2050 | |
0907d710 | 2051 | psklen = s->psk_server_callback(s, s->session->psk_identity, |
a230b26e | 2052 | psk, sizeof(psk)); |
85269210 | 2053 | |
0907d710 MC |
2054 | if (psklen > PSK_MAX_PSK_LEN) { |
2055 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2056 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2057 | return 0; |
2058 | } else if (psklen == 0) { | |
2059 | /* | |
2060 | * PSK related to the given identity not found | |
2061 | */ | |
2062 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
c76a4aea | 2063 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, |
0907d710 MC |
2064 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2065 | return 0; | |
2066 | } | |
85269210 | 2067 | |
0907d710 MC |
2068 | OPENSSL_free(s->s3->tmp.psk); |
2069 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); | |
2070 | OPENSSL_cleanse(psk, psklen); | |
85269210 | 2071 | |
0907d710 MC |
2072 | if (s->s3->tmp.psk == NULL) { |
2073 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2074 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE); |
0907d710 | 2075 | return 0; |
85269210 | 2076 | } |
0907d710 MC |
2077 | |
2078 | s->s3->tmp.psklen = psklen; | |
2079 | ||
2080 | return 1; | |
2081 | #else | |
2082 | /* Should never happen */ | |
2083 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2084 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 | 2085 | return 0; |
85269210 | 2086 | #endif |
0907d710 MC |
2087 | } |
2088 | ||
0907d710 MC |
2089 | static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al) |
2090 | { | |
bc36ee62 | 2091 | #ifndef OPENSSL_NO_RSA |
0907d710 MC |
2092 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2093 | int decrypt_len; | |
2094 | unsigned char decrypt_good, version_good; | |
2095 | size_t j, padding_len; | |
2096 | PACKET enc_premaster; | |
2097 | RSA *rsa = NULL; | |
2098 | unsigned char *rsa_decrypt = NULL; | |
2099 | int ret = 0; | |
2100 | ||
2101 | rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey); | |
2102 | if (rsa == NULL) { | |
2103 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2104 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE); |
0907d710 MC |
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; | |
c76a4aea | 2115 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH); |
0907d710 | 2116 | return 0; |
0f113f3e | 2117 | } |
0907d710 | 2118 | } |
0f113f3e | 2119 | |
0907d710 MC |
2120 | /* |
2121 | * We want to be sure that the plaintext buffer size makes it safe to | |
2122 | * iterate over the entire size of a premaster secret | |
2123 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2124 | * their ciphertext cannot accommodate a premaster secret anyway. | |
2125 | */ | |
2126 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { | |
2127 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2128 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL); |
0907d710 MC |
2129 | return 0; |
2130 | } | |
0f113f3e | 2131 | |
0907d710 MC |
2132 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2133 | if (rsa_decrypt == NULL) { | |
2134 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2135 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE); |
0907d710 MC |
2136 | return 0; |
2137 | } | |
0f113f3e | 2138 | |
0907d710 MC |
2139 | /* |
2140 | * We must not leak whether a decryption failure occurs because of | |
2141 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2142 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2143 | * generates a random premaster secret for the case that the decrypt | |
2144 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2145 | */ | |
20ca916d | 2146 | |
a230b26e | 2147 | if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0) |
0907d710 | 2148 | goto err; |
0f113f3e | 2149 | |
0907d710 MC |
2150 | /* |
2151 | * Decrypt with no padding. PKCS#1 padding will be removed as part of | |
2152 | * the timing-sensitive code below. | |
2153 | */ | |
348240c6 MC |
2154 | /* TODO(size_t): Convert this function */ |
2155 | decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster), | |
2156 | PACKET_data(&enc_premaster), | |
2157 | rsa_decrypt, rsa, RSA_NO_PADDING); | |
0907d710 MC |
2158 | if (decrypt_len < 0) |
2159 | goto err; | |
20ca916d | 2160 | |
0907d710 | 2161 | /* Check the padding. See RFC 3447, section 7.2.2. */ |
5b8fa431 | 2162 | |
0907d710 MC |
2163 | /* |
2164 | * The smallest padded premaster is 11 bytes of overhead. Small keys | |
2165 | * are publicly invalid, so this may return immediately. This ensures | |
2166 | * PS is at least 8 bytes. | |
2167 | */ | |
2168 | if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) { | |
2169 | *al = SSL_AD_DECRYPT_ERROR; | |
c76a4aea | 2170 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED); |
0907d710 MC |
2171 | goto err; |
2172 | } | |
0f113f3e | 2173 | |
0907d710 MC |
2174 | padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH; |
2175 | decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) & | |
a230b26e | 2176 | constant_time_eq_int_8(rsa_decrypt[1], 2); |
0907d710 MC |
2177 | for (j = 2; j < padding_len - 1; j++) { |
2178 | decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]); | |
2179 | } | |
2180 | decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]); | |
5b8fa431 | 2181 | |
0907d710 MC |
2182 | /* |
2183 | * If the version in the decrypted pre-master secret is correct then | |
2184 | * version_good will be 0xff, otherwise it'll be zero. The | |
2185 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2186 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2187 | * check as a "bad version oracle". Thus version checks are done in | |
2188 | * constant time and are treated like any other decryption error. | |
2189 | */ | |
2190 | version_good = | |
2191 | constant_time_eq_8(rsa_decrypt[padding_len], | |
2192 | (unsigned)(s->client_version >> 8)); | |
2193 | version_good &= | |
2194 | constant_time_eq_8(rsa_decrypt[padding_len + 1], | |
2195 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e | 2196 | |
0907d710 MC |
2197 | /* |
2198 | * The premaster secret must contain the same version number as the | |
2199 | * ClientHello to detect version rollback attacks (strangely, the | |
2200 | * protocol does not offer such protection for DH ciphersuites). | |
2201 | * However, buggy clients exist that send the negotiated protocol | |
2202 | * version instead if the server does not support the requested | |
2203 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2204 | * clients. | |
2205 | */ | |
2206 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2207 | unsigned char workaround_good; | |
2208 | workaround_good = constant_time_eq_8(rsa_decrypt[padding_len], | |
2209 | (unsigned)(s->version >> 8)); | |
2210 | workaround_good &= | |
5b8fa431 | 2211 | constant_time_eq_8(rsa_decrypt[padding_len + 1], |
0907d710 MC |
2212 | (unsigned)(s->version & 0xff)); |
2213 | version_good |= workaround_good; | |
2214 | } | |
0f113f3e | 2215 | |
0907d710 MC |
2216 | /* |
2217 | * Both decryption and version must be good for decrypt_good to | |
2218 | * remain non-zero (0xff). | |
2219 | */ | |
2220 | decrypt_good &= version_good; | |
0f113f3e | 2221 | |
0907d710 MC |
2222 | /* |
2223 | * Now copy rand_premaster_secret over from p using | |
2224 | * decrypt_good_mask. If decryption failed, then p does not | |
2225 | * contain valid plaintext, however, a check above guarantees | |
2226 | * it is still sufficiently large to read from. | |
2227 | */ | |
2228 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
2229 | rsa_decrypt[padding_len + j] = | |
2230 | constant_time_select_8(decrypt_good, | |
2231 | rsa_decrypt[padding_len + j], | |
2232 | rand_premaster_secret[j]); | |
2233 | } | |
0f113f3e | 2234 | |
0907d710 MC |
2235 | if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len, |
2236 | sizeof(rand_premaster_secret), 0)) { | |
2237 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2238 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2239 | goto err; |
2240 | } | |
0f113f3e | 2241 | |
0907d710 MC |
2242 | ret = 1; |
2243 | err: | |
2244 | OPENSSL_free(rsa_decrypt); | |
2245 | return ret; | |
2246 | #else | |
2247 | /* Should never happen */ | |
2248 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2249 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2250 | return 0; |
2251 | #endif | |
2252 | } | |
2253 | ||
642360f9 MC |
2254 | static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al) |
2255 | { | |
2256 | #ifndef OPENSSL_NO_DH | |
2257 | EVP_PKEY *skey = NULL; | |
2258 | DH *cdh; | |
2259 | unsigned int i; | |
2260 | BIGNUM *pub_key; | |
2261 | const unsigned char *data; | |
2262 | EVP_PKEY *ckey = NULL; | |
2263 | int ret = 0; | |
2264 | ||
31a7d80d | 2265 | if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) { |
642360f9 | 2266 | *al = SSL_AD_HANDSHAKE_FAILURE; |
c76a4aea | 2267 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, |
642360f9 MC |
2268 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2269 | goto err; | |
2270 | } | |
642360f9 MC |
2271 | skey = s->s3->tmp.pkey; |
2272 | if (skey == NULL) { | |
2273 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2274 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY); |
642360f9 MC |
2275 | goto err; |
2276 | } | |
2277 | ||
2278 | if (PACKET_remaining(pkt) == 0L) { | |
2279 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2280 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY); |
642360f9 MC |
2281 | goto err; |
2282 | } | |
2283 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2284 | /* We already checked we have enough data */ | |
2285 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2286 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2287 | goto err; |
2288 | } | |
2289 | ckey = EVP_PKEY_new(); | |
2290 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { | |
c76a4aea | 2291 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB); |
642360f9 MC |
2292 | goto err; |
2293 | } | |
2294 | cdh = EVP_PKEY_get0_DH(ckey); | |
2295 | pub_key = BN_bin2bn(data, i, NULL); | |
2296 | ||
2297 | if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) { | |
c76a4aea | 2298 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2299 | if (pub_key != NULL) |
2300 | BN_free(pub_key); | |
2301 | goto err; | |
2302 | } | |
2303 | ||
2304 | if (ssl_derive(s, skey, ckey) == 0) { | |
2305 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2306 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2307 | goto err; |
2308 | } | |
2309 | ||
2310 | ret = 1; | |
2311 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2312 | s->s3->tmp.pkey = NULL; | |
2313 | err: | |
2314 | EVP_PKEY_free(ckey); | |
2315 | return ret; | |
2316 | #else | |
2317 | /* Should never happen */ | |
2318 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2319 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2320 | return 0; |
2321 | #endif | |
2322 | } | |
2323 | ||
19ed1ec1 MC |
2324 | static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al) |
2325 | { | |
2326 | #ifndef OPENSSL_NO_EC | |
2327 | EVP_PKEY *skey = s->s3->tmp.pkey; | |
2328 | EVP_PKEY *ckey = NULL; | |
2329 | int ret = 0; | |
2330 | ||
2331 | if (PACKET_remaining(pkt) == 0L) { | |
2332 | /* We don't support ECDH client auth */ | |
2333 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2334 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY); |
19ed1ec1 MC |
2335 | goto err; |
2336 | } else { | |
2337 | unsigned int i; | |
2338 | const unsigned char *data; | |
2339 | ||
2340 | /* | |
2341 | * Get client's public key from encoded point in the | |
2342 | * ClientKeyExchange message. | |
2343 | */ | |
2344 | ||
2345 | /* Get encoded point length */ | |
fb933982 DSH |
2346 | if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i) |
2347 | || PACKET_remaining(pkt) != 0) { | |
19ed1ec1 | 2348 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2349 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH); |
19ed1ec1 MC |
2350 | goto err; |
2351 | } | |
19ed1ec1 MC |
2352 | ckey = EVP_PKEY_new(); |
2353 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
c76a4aea | 2354 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB); |
19ed1ec1 MC |
2355 | goto err; |
2356 | } | |
ec24630a | 2357 | if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) { |
fb933982 | 2358 | *al = SSL_AD_HANDSHAKE_FAILURE; |
c76a4aea | 2359 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB); |
19ed1ec1 MC |
2360 | goto err; |
2361 | } | |
2362 | } | |
2363 | ||
2364 | if (ssl_derive(s, skey, ckey) == 0) { | |
2365 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2366 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR); |
19ed1ec1 MC |
2367 | goto err; |
2368 | } | |
2369 | ||
2370 | ret = 1; | |
2371 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2372 | s->s3->tmp.pkey = NULL; | |
2373 | err: | |
2374 | EVP_PKEY_free(ckey); | |
2375 | ||
2376 | return ret; | |
2377 | #else | |
2378 | /* Should never happen */ | |
2379 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2380 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR); |
19ed1ec1 MC |
2381 | return 0; |
2382 | #endif | |
2383 | } | |
2384 | ||
c437eef6 MC |
2385 | static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al) |
2386 | { | |
2387 | #ifndef OPENSSL_NO_SRP | |
2388 | unsigned int i; | |
2389 | const unsigned char *data; | |
2390 | ||
2391 | if (!PACKET_get_net_2(pkt, &i) | |
a230b26e | 2392 | || !PACKET_get_bytes(pkt, &data, i)) { |
c437eef6 | 2393 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2394 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH); |
c437eef6 MC |
2395 | return 0; |
2396 | } | |
2397 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { | |
c76a4aea | 2398 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB); |
c437eef6 MC |
2399 | return 0; |
2400 | } | |
a230b26e | 2401 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) { |
c437eef6 | 2402 | *al = SSL_AD_ILLEGAL_PARAMETER; |
c76a4aea | 2403 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS); |
c437eef6 MC |
2404 | return 0; |
2405 | } | |
2406 | OPENSSL_free(s->session->srp_username); | |
2407 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); | |
2408 | if (s->session->srp_username == NULL) { | |
c76a4aea | 2409 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE); |
c437eef6 MC |
2410 | return 0; |
2411 | } | |
2412 | ||
2413 | if (!srp_generate_server_master_secret(s)) { | |
c76a4aea | 2414 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2415 | return 0; |
2416 | } | |
2417 | ||
2418 | return 1; | |
2419 | #else | |
2420 | /* Should never happen */ | |
2421 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2422 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2423 | return 0; |
2424 | #endif | |
2425 | } | |
2426 | ||
2427 | static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al) | |
2428 | { | |
2429 | #ifndef OPENSSL_NO_GOST | |
2430 | EVP_PKEY_CTX *pkey_ctx; | |
2431 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2432 | unsigned char premaster_secret[32]; | |
2433 | const unsigned char *start; | |
2434 | size_t outlen = 32, inlen; | |
2435 | unsigned long alg_a; | |
2436 | int Ttag, Tclass; | |
2437 | long Tlen; | |
348240c6 | 2438 | size_t sess_key_len; |
c437eef6 MC |
2439 | const unsigned char *data; |
2440 | int ret = 0; | |
2441 | ||
2442 | /* Get our certificate private key */ | |
2443 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2444 | if (alg_a & SSL_aGOST12) { | |
2445 | /* | |
2446 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2447 | */ | |
2448 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2449 | if (pk == NULL) { | |
2450 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2451 | } | |
2452 | if (pk == NULL) { | |
2453 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2454 | } | |
2455 | } else if (alg_a & SSL_aGOST01) { | |
2456 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2457 | } | |
2458 | ||
2459 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
2460 | if (pkey_ctx == NULL) { | |
2461 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2462 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE); |
c437eef6 MC |
2463 | return 0; |
2464 | } | |
2465 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { | |
2466 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2467 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2468 | return 0; |
2469 | } | |
2470 | /* | |
2471 | * If client certificate is present and is of the same type, maybe | |
2472 | * use it for key exchange. Don't mind errors from | |
2473 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2474 | * client certificate for authorization only. | |
2475 | */ | |
2476 | client_pub_pkey = X509_get0_pubkey(s->session->peer); | |
2477 | if (client_pub_pkey) { | |
2478 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2479 | ERR_clear_error(); | |
2480 | } | |
2481 | /* Decrypt session key */ | |
2482 | sess_key_len = PACKET_remaining(pkt); | |
2483 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
2484 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2485 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2486 | goto err; |
2487 | } | |
348240c6 | 2488 | /* TODO(size_t): Convert this function */ |
a230b26e | 2489 | if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag, |
348240c6 | 2490 | &Tclass, (long)sess_key_len) != V_ASN1_CONSTRUCTED |
a230b26e | 2491 | || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) { |
c437eef6 | 2492 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2493 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED); |
c437eef6 MC |
2494 | goto err; |
2495 | } | |
2496 | start = data; | |
2497 | inlen = Tlen; | |
2498 | if (EVP_PKEY_decrypt | |
2499 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
2500 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2501 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED); |
c437eef6 MC |
2502 | goto err; |
2503 | } | |
2504 | /* Generate master secret */ | |
2505 | if (!ssl_generate_master_secret(s, premaster_secret, | |
2506 | sizeof(premaster_secret), 0)) { | |
2507 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2508 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2509 | goto err; |
2510 | } | |
2511 | /* Check if pubkey from client certificate was used */ | |
2512 | if (EVP_PKEY_CTX_ctrl | |
2513 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
2514 | s->statem.no_cert_verify = 1; | |
2515 | ||
2516 | ret = 1; | |
2517 | err: | |
2518 | EVP_PKEY_CTX_free(pkey_ctx); | |
2519 | return ret; | |
2520 | #else | |
2521 | /* Should never happen */ | |
2522 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2523 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2524 | return 0; |
2525 | #endif | |
2526 | } | |
2527 | ||
0907d710 MC |
2528 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
2529 | { | |
2530 | int al = -1; | |
2531 | unsigned long alg_k; | |
2532 | ||
2533 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
2534 | ||
2535 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2536 | if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al)) | |
2537 | goto err; | |
2538 | ||
2539 | if (alg_k & SSL_kPSK) { | |
2540 | /* Identity extracted earlier: should be nothing left */ | |
2541 | if (PACKET_remaining(pkt) != 0) { | |
2542 | al = SSL_AD_HANDSHAKE_FAILURE; | |
a230b26e EK |
2543 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2544 | SSL_R_LENGTH_MISMATCH); | |
9059eb71 | 2545 | goto err; |
0907d710 MC |
2546 | } |
2547 | /* PSK handled by ssl_generate_master_secret */ | |
2548 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
69f68237 | 2549 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2550 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
9059eb71 | 2551 | goto err; |
69f68237 | 2552 | } |
0907d710 MC |
2553 | } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
2554 | if (!tls_process_cke_rsa(s, pkt, &al)) | |
2555 | goto err; | |
642360f9 MC |
2556 | } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
2557 | if (!tls_process_cke_dhe(s, pkt, &al)) | |
0f113f3e | 2558 | goto err; |
19ed1ec1 MC |
2559 | } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2560 | if (!tls_process_cke_ecdhe(s, pkt, &al)) | |
2561 | goto err; | |
c437eef6 MC |
2562 | } else if (alg_k & SSL_kSRP) { |
2563 | if (!tls_process_cke_srp(s, pkt, &al)) | |
0f113f3e | 2564 | goto err; |
c437eef6 MC |
2565 | } else if (alg_k & SSL_kGOST) { |
2566 | if (!tls_process_cke_gost(s, pkt, &al)) | |
0f113f3e | 2567 | goto err; |
c437eef6 | 2568 | } else { |
0f113f3e | 2569 | al = SSL_AD_HANDSHAKE_FAILURE; |
a230b26e EK |
2570 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2571 | SSL_R_UNKNOWN_CIPHER_TYPE); | |
9059eb71 | 2572 | goto err; |
0f113f3e MC |
2573 | } |
2574 | ||
e27f234a | 2575 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2576 | err: |
0907d710 MC |
2577 | if (al != -1) |
2578 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
85269210 DSH |
2579 | #ifndef OPENSSL_NO_PSK |
2580 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2581 | s->s3->tmp.psk = NULL; | |
58964a49 | 2582 | #endif |
fe3a3291 | 2583 | ossl_statem_set_error(s); |
e27f234a | 2584 | return MSG_PROCESS_ERROR; |
0f113f3e | 2585 | } |
d02b48c6 | 2586 | |
be3583fa | 2587 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2588 | { |
94836de2 | 2589 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2590 | if (wst == WORK_MORE_A) { |
2591 | if (SSL_IS_DTLS(s)) { | |
2592 | unsigned char sctpauthkey[64]; | |
2593 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2594 | /* | |
2595 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2596 | * used. | |
2597 | */ | |
141eb8c6 MC |
2598 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2599 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2600 | |
2601 | if (SSL_export_keying_material(s, sctpauthkey, | |
a230b26e EK |
2602 | sizeof(sctpauthkey), labelbuffer, |
2603 | sizeof(labelbuffer), NULL, 0, | |
2604 | 0) <= 0) { | |
fe3a3291 | 2605 | ossl_statem_set_error(s); |
c130dd8e MC |
2606 | return WORK_ERROR;; |
2607 | } | |
94836de2 | 2608 | |
c130dd8e MC |
2609 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2610 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2611 | } |
c130dd8e MC |
2612 | wst = WORK_MORE_B; |
2613 | } | |
94836de2 | 2614 | |
c130dd8e | 2615 | if ((wst == WORK_MORE_B) |
a230b26e EK |
2616 | /* Is this SCTP? */ |
2617 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2618 | /* Are we renegotiating? */ | |
2619 | && s->renegotiate | |
2620 | /* Are we going to skip the CertificateVerify? */ | |
2621 | && (s->session->peer == NULL || s->statem.no_cert_verify) | |
2622 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
c130dd8e MC |
2623 | s->s3->in_read_app_data = 2; |
2624 | s->rwstate = SSL_READING; | |
2625 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2626 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 2627 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
2628 | return WORK_MORE_B; |
2629 | } else { | |
fe3a3291 | 2630 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
2631 | } |
2632 | #endif | |
2633 | ||
149c2ef5 | 2634 | if (s->statem.no_cert_verify || !s->session->peer) { |
a230b26e EK |
2635 | /* |
2636 | * No certificate verify or no peer certificate so we no longer need | |
2637 | * the handshake_buffer | |
149c2ef5 MC |
2638 | */ |
2639 | if (!ssl3_digest_cached_records(s, 0)) { | |
2640 | ossl_statem_set_error(s); | |
2641 | return WORK_ERROR; | |
2642 | } | |
94836de2 | 2643 | return WORK_FINISHED_CONTINUE; |
28f4580c | 2644 | } else { |
94836de2 MC |
2645 | if (!s->s3->handshake_buffer) { |
2646 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
2647 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 2648 | ossl_statem_set_error(s); |
94836de2 MC |
2649 | return WORK_ERROR; |
2650 | } | |
2651 | /* | |
2652 | * For sigalgs freeze the handshake buffer. If we support | |
2653 | * extms we've done this already so this is a no-op | |
2654 | */ | |
2655 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 2656 | ossl_statem_set_error(s); |
94836de2 MC |
2657 | return WORK_ERROR; |
2658 | } | |
94836de2 MC |
2659 | } |
2660 | ||
2661 | return WORK_FINISHED_CONTINUE; | |
2662 | } | |
2663 | ||
be3583fa | 2664 | MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt) |
e27f234a MC |
2665 | { |
2666 | EVP_PKEY *pkey = NULL; | |
b6981744 | 2667 | const unsigned char *sig, *data; |
5ca17d8c | 2668 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2669 | unsigned char *gost_data = NULL; |
5ca17d8c | 2670 | #endif |
e27f234a | 2671 | int al, ret = MSG_PROCESS_ERROR; |
28f4580c | 2672 | int type = 0, j; |
e27f234a MC |
2673 | unsigned int len; |
2674 | X509 *peer; | |
2675 | const EVP_MD *md = NULL; | |
28f4580c DSH |
2676 | long hdatalen = 0; |
2677 | void *hdata; | |
2678 | ||
bfb0641f | 2679 | EVP_MD_CTX *mctx = EVP_MD_CTX_new(); |
6e59a892 RL |
2680 | |
2681 | if (mctx == NULL) { | |
2682 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2683 | al = SSL_AD_INTERNAL_ERROR; | |
2684 | goto f_err; | |
2685 | } | |
e27f234a | 2686 | |
a0bd6493 | 2687 | peer = s->session->peer; |
8382fd3a | 2688 | pkey = X509_get0_pubkey(peer); |
a0bd6493 | 2689 | type = X509_certificate_type(peer, pkey); |
0f113f3e MC |
2690 | |
2691 | if (!(type & EVP_PKT_SIGN)) { | |
e27f234a | 2692 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, |
0f113f3e MC |
2693 | SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); |
2694 | al = SSL_AD_ILLEGAL_PARAMETER; | |
2695 | goto f_err; | |
2696 | } | |
2697 | ||
0f113f3e MC |
2698 | /* Check for broken implementations of GOST ciphersuites */ |
2699 | /* | |
2700 | * If key is GOST and n is exactly 64, it is bare signature without | |
e44380a9 | 2701 | * length field (CryptoPro implementations at least till CSP 4.0) |
0f113f3e | 2702 | */ |
2a9b9654 | 2703 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2704 | if (PACKET_remaining(pkt) == 64 |
2705 | && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { | |
f532a35d | 2706 | len = 64; |
2a9b9654 MC |
2707 | } else |
2708 | #endif | |
2709 | { | |
0f113f3e | 2710 | if (SSL_USE_SIGALGS(s)) { |
f532a35d MC |
2711 | int rv; |
2712 | ||
73999b62 | 2713 | if (!PACKET_get_bytes(pkt, &sig, 2)) { |
f532a35d MC |
2714 | al = SSL_AD_DECODE_ERROR; |
2715 | goto f_err; | |
2716 | } | |
2717 | rv = tls12_check_peer_sigalg(&md, s, sig, pkey); | |
0f113f3e MC |
2718 | if (rv == -1) { |
2719 | al = SSL_AD_INTERNAL_ERROR; | |
2720 | goto f_err; | |
2721 | } else if (rv == 0) { | |
2722 | al = SSL_AD_DECODE_ERROR; | |
2723 | goto f_err; | |
2724 | } | |
f37f20ff | 2725 | #ifdef SSL_DEBUG |
0f113f3e | 2726 | fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); |
f37f20ff | 2727 | #endif |
28f4580c | 2728 | } else { |
aa430c74 DSH |
2729 | /* Use default digest for this key type */ |
2730 | int idx = ssl_cert_type(NULL, pkey); | |
2731 | if (idx >= 0) | |
2732 | md = s->s3->tmp.md[idx]; | |
2733 | if (md == NULL) { | |
2734 | al = SSL_AD_INTERNAL_ERROR; | |
2735 | goto f_err; | |
2736 | } | |
0f113f3e | 2737 | } |
aa430c74 | 2738 | |
73999b62 | 2739 | if (!PACKET_get_net_2(pkt, &len)) { |
e27f234a | 2740 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2741 | al = SSL_AD_DECODE_ERROR; |
2742 | goto f_err; | |
2743 | } | |
2744 | } | |
2745 | j = EVP_PKEY_size(pkey); | |
73999b62 | 2746 | if (((int)len > j) || ((int)PACKET_remaining(pkt) > j) |
a230b26e | 2747 | || (PACKET_remaining(pkt) == 0)) { |
e27f234a | 2748 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE); |
0f113f3e MC |
2749 | al = SSL_AD_DECODE_ERROR; |
2750 | goto f_err; | |
2751 | } | |
73999b62 | 2752 | if (!PACKET_get_bytes(pkt, &data, len)) { |
e27f234a | 2753 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH); |
f532a35d MC |
2754 | al = SSL_AD_DECODE_ERROR; |
2755 | goto f_err; | |
2756 | } | |
0f113f3e | 2757 | |
28f4580c DSH |
2758 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); |
2759 | if (hdatalen <= 0) { | |
2760 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR); | |
2761 | al = SSL_AD_INTERNAL_ERROR; | |
2762 | goto f_err; | |
2763 | } | |
f37f20ff | 2764 | #ifdef SSL_DEBUG |
28f4580c | 2765 | fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md)); |
f37f20ff | 2766 | #endif |
6e59a892 RL |
2767 | if (!EVP_VerifyInit_ex(mctx, md, NULL) |
2768 | || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) { | |
28f4580c DSH |
2769 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); |
2770 | al = SSL_AD_INTERNAL_ERROR; | |
2771 | goto f_err; | |
2772 | } | |
2a9b9654 | 2773 | #ifndef OPENSSL_NO_GOST |
3aeb9348 DSH |
2774 | { |
2775 | int pktype = EVP_PKEY_id(pkey); | |
2776 | if (pktype == NID_id_GostR3410_2001 | |
2777 | || pktype == NID_id_GostR3410_2012_256 | |
b6981744 EK |
2778 | || pktype == NID_id_GostR3410_2012_512) { |
2779 | if ((gost_data = OPENSSL_malloc(len)) == NULL) { | |
2780 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE); | |
2781 | al = SSL_AD_INTERNAL_ERROR; | |
2782 | goto f_err; | |
2783 | } | |
2784 | BUF_reverse(gost_data, data, len); | |
2785 | data = gost_data; | |
2786 | } | |
28f4580c | 2787 | } |
2a9b9654 | 2788 | #endif |
e44380a9 | 2789 | |
28f4580c | 2790 | if (s->version == SSL3_VERSION |
6e59a892 | 2791 | && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET, |
348240c6 | 2792 | (int)s->session->master_key_length, |
28f4580c DSH |
2793 | s->session->master_key)) { |
2794 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB); | |
2795 | al = SSL_AD_INTERNAL_ERROR; | |
2796 | goto f_err; | |
2797 | } | |
2798 | ||
6e59a892 | 2799 | if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) { |
28f4580c DSH |
2800 | al = SSL_AD_DECRYPT_ERROR; |
2801 | SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE); | |
0f113f3e MC |
2802 | goto f_err; |
2803 | } | |
2804 | ||
c130dd8e | 2805 | ret = MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e MC |
2806 | if (0) { |
2807 | f_err: | |
2808 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
fe3a3291 | 2809 | ossl_statem_set_error(s); |
0f113f3e | 2810 | } |
25aaa98a RS |
2811 | BIO_free(s->s3->handshake_buffer); |
2812 | s->s3->handshake_buffer = NULL; | |
bfb0641f | 2813 | EVP_MD_CTX_free(mctx); |
5ca17d8c | 2814 | #ifndef OPENSSL_NO_GOST |
b6981744 | 2815 | OPENSSL_free(gost_data); |
5ca17d8c | 2816 | #endif |
e27f234a | 2817 | return ret; |
0f113f3e | 2818 | } |
d02b48c6 | 2819 | |
be3583fa | 2820 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 2821 | { |
20dbe585 | 2822 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
2823 | X509 *x = NULL; |
2824 | unsigned long l, llen; | |
b6981744 | 2825 | const unsigned char *certstart, *certbytes; |
e27f234a | 2826 | STACK_OF(X509) *sk = NULL; |
73999b62 | 2827 | PACKET spkt; |
0f113f3e MC |
2828 | |
2829 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
2830 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2831 | goto f_err; | |
0f113f3e MC |
2832 | } |
2833 | ||
73999b62 | 2834 | if (!PACKET_get_net_3(pkt, &llen) |
a230b26e EK |
2835 | || !PACKET_get_sub_packet(pkt, &spkt, llen) |
2836 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 2837 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2838 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
2839 | goto f_err; |
2840 | } | |
0bc09ecd MC |
2841 | |
2842 | while (PACKET_remaining(&spkt) > 0) { | |
2843 | if (!PACKET_get_net_3(&spkt, &l) | |
a230b26e | 2844 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { |
0f113f3e | 2845 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2846 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2847 | SSL_R_CERT_LENGTH_MISMATCH); |
2848 | goto f_err; | |
2849 | } | |
2850 | ||
0bc09ecd MC |
2851 | certstart = certbytes; |
2852 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 2853 | if (x == NULL) { |
e27f234a MC |
2854 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
2855 | goto f_err; | |
0f113f3e | 2856 | } |
0bc09ecd | 2857 | if (certbytes != (certstart + l)) { |
0f113f3e | 2858 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 2859 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2860 | SSL_R_CERT_LENGTH_MISMATCH); |
2861 | goto f_err; | |
2862 | } | |
2863 | if (!sk_X509_push(sk, x)) { | |
e27f234a MC |
2864 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
2865 | goto f_err; | |
0f113f3e MC |
2866 | } |
2867 | x = NULL; | |
0f113f3e MC |
2868 | } |
2869 | ||
2870 | if (sk_X509_num(sk) <= 0) { | |
2871 | /* TLS does not mind 0 certs returned */ | |
2872 | if (s->version == SSL3_VERSION) { | |
2873 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2874 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2875 | SSL_R_NO_CERTIFICATES_RETURNED); |
2876 | goto f_err; | |
2877 | } | |
2878 | /* Fail for TLS only if we required a certificate */ | |
2879 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
2880 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 2881 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2882 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
2883 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2884 | goto f_err; | |
2885 | } | |
2886 | /* No client certificate so digest cached records */ | |
124037fd | 2887 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
2888 | goto f_err; |
2889 | } | |
2890 | } else { | |
2891 | EVP_PKEY *pkey; | |
2892 | i = ssl_verify_cert_chain(s, sk); | |
2893 | if (i <= 0) { | |
2894 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 2895 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2896 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
2897 | goto f_err; | |
2898 | } | |
2899 | if (i > 1) { | |
e27f234a | 2900 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
2901 | al = SSL_AD_HANDSHAKE_FAILURE; |
2902 | goto f_err; | |
2903 | } | |
8382fd3a | 2904 | pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); |
0f113f3e MC |
2905 | if (pkey == NULL) { |
2906 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 2907 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
2908 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
2909 | goto f_err; | |
2910 | } | |
0f113f3e MC |
2911 | } |
2912 | ||
222561fe | 2913 | X509_free(s->session->peer); |
0f113f3e MC |
2914 | s->session->peer = sk_X509_shift(sk); |
2915 | s->session->verify_result = s->verify_result; | |
2916 | ||
c34b0f99 DSH |
2917 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
2918 | s->session->peer_chain = sk; | |
0f113f3e MC |
2919 | /* |
2920 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
d4d78943 | 2921 | * certificate, while we do include it in statem_clnt.c |
0f113f3e | 2922 | */ |
0f113f3e | 2923 | sk = NULL; |
e27f234a | 2924 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
2925 | goto done; |
2926 | ||
0f113f3e | 2927 | f_err: |
66696478 | 2928 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 2929 | ossl_statem_set_error(s); |
66696478 | 2930 | done: |
222561fe RS |
2931 | X509_free(x); |
2932 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 2933 | return ret; |
0f113f3e | 2934 | } |
d02b48c6 | 2935 | |
7cea05dc | 2936 | int tls_construct_server_certificate(SSL *s, WPACKET *pkt) |
e27f234a MC |
2937 | { |
2938 | CERT_PKEY *cpk; | |
2939 | ||
2940 | cpk = ssl_get_server_send_pkey(s); | |
2941 | if (cpk == NULL) { | |
2942 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
e27f234a MC |
2943 | return 0; |
2944 | } | |
2945 | ||
7cea05dc | 2946 | if (!ssl3_output_cert_chain(s, pkt, cpk)) { |
e27f234a | 2947 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); |
e27f234a MC |
2948 | return 0; |
2949 | } | |
2950 | ||
2951 | return 1; | |
2952 | } | |
2953 | ||
7cea05dc | 2954 | int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt) |
e27f234a MC |
2955 | { |
2956 | unsigned char *senc = NULL; | |
83ae4661 | 2957 | EVP_CIPHER_CTX *ctx = NULL; |
bf7c6817 | 2958 | HMAC_CTX *hctx = NULL; |
a00d75e1 | 2959 | unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2; |
e27f234a | 2960 | const unsigned char *const_p; |
a00d75e1 | 2961 | int len, slen_full, slen, lenfinal; |
e27f234a MC |
2962 | SSL_SESSION *sess; |
2963 | unsigned int hlen; | |
2964 | SSL_CTX *tctx = s->initial_ctx; | |
2965 | unsigned char iv[EVP_MAX_IV_LENGTH]; | |
d139723b KR |
2966 | unsigned char key_name[TLSEXT_KEYNAME_LENGTH]; |
2967 | int iv_len; | |
a00d75e1 | 2968 | size_t macoffset, macendoffset; |
e27f234a MC |
2969 | |
2970 | /* get session encoding length */ | |
2971 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
2972 | /* | |
2973 | * Some length values are 16 bits, so forget it if session is too | |
2974 | * long | |
2975 | */ | |
2976 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 2977 | ossl_statem_set_error(s); |
e27f234a MC |
2978 | return 0; |
2979 | } | |
2980 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 2981 | if (senc == NULL) { |
fe3a3291 | 2982 | ossl_statem_set_error(s); |
e27f234a MC |
2983 | return 0; |
2984 | } | |
0f113f3e | 2985 | |
846ec07d | 2986 | ctx = EVP_CIPHER_CTX_new(); |
bf7c6817 | 2987 | hctx = HMAC_CTX_new(); |
83ae4661 MC |
2988 | if (ctx == NULL || hctx == NULL) { |
2989 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); | |
2990 | goto err; | |
2991 | } | |
0f113f3e | 2992 | |
e27f234a MC |
2993 | p = senc; |
2994 | if (!i2d_SSL_SESSION(s->session, &p)) | |
2995 | goto err; | |
687eaf27 | 2996 | |
e27f234a MC |
2997 | /* |
2998 | * create a fresh copy (not shared with other threads) to clean up | |
2999 | */ | |
3000 | const_p = senc; | |
3001 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3002 | if (sess == NULL) | |
3003 | goto err; | |
3004 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3005 | |
e27f234a MC |
3006 | slen = i2d_SSL_SESSION(sess, NULL); |
3007 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3008 | SSL_SESSION_free(sess); | |
3009 | goto err; | |
3010 | } | |
3011 | p = senc; | |
3012 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3013 | SSL_SESSION_free(sess); | |
3014 | goto err; | |
3015 | } | |
3016 | SSL_SESSION_free(sess); | |
0f113f3e | 3017 | |
e27f234a MC |
3018 | /* |
3019 | * Initialize HMAC and cipher contexts. If callback present it does | |
3020 | * all the work otherwise use generated values from parent ctx. | |
3021 | */ | |
3022 | if (tctx->tlsext_ticket_key_cb) { | |
5c753de6 TS |
3023 | /* if 0 is returned, write an empty ticket */ |
3024 | int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx, | |
3025 | hctx, 1); | |
3026 | ||
3027 | if (ret == 0) { | |
a00d75e1 MC |
3028 | |
3029 | /* Put timeout and length */ | |
7cea05dc | 3030 | if (!WPACKET_put_bytes_u32(pkt, 0) |
4a01c59f | 3031 | || !WPACKET_put_bytes_u16(pkt, 0)) { |
a00d75e1 MC |
3032 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, |
3033 | ERR_R_INTERNAL_ERROR); | |
5c753de6 | 3034 | goto err; |
a00d75e1 | 3035 | } |
5c753de6 TS |
3036 | OPENSSL_free(senc); |
3037 | EVP_CIPHER_CTX_free(ctx); | |
3038 | HMAC_CTX_free(hctx); | |
3039 | return 1; | |
3040 | } | |
3041 | if (ret < 0) | |
e27f234a | 3042 | goto err; |
d139723b | 3043 | iv_len = EVP_CIPHER_CTX_iv_length(ctx); |
e27f234a | 3044 | } else { |
d139723b KR |
3045 | const EVP_CIPHER *cipher = EVP_aes_256_cbc(); |
3046 | ||
3047 | iv_len = EVP_CIPHER_iv_length(cipher); | |
3048 | if (RAND_bytes(iv, iv_len) <= 0) | |
687eaf27 | 3049 | goto err; |
d139723b | 3050 | if (!EVP_EncryptInit_ex(ctx, cipher, NULL, |
e27f234a | 3051 | tctx->tlsext_tick_aes_key, iv)) |
687eaf27 | 3052 | goto err; |
4e2e1ec9 TS |
3053 | if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, |
3054 | sizeof(tctx->tlsext_tick_hmac_key), | |
e27f234a | 3055 | EVP_sha256(), NULL)) |
4f9fab6b | 3056 | goto err; |
4e2e1ec9 TS |
3057 | memcpy(key_name, tctx->tlsext_tick_key_name, |
3058 | sizeof(tctx->tlsext_tick_key_name)); | |
0f113f3e MC |
3059 | } |
3060 | ||
e27f234a MC |
3061 | /* |
3062 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3063 | * for resumed session (for simplicity), and guess that tickets for | |
3064 | * new sessions will live as long as their sessions. | |
3065 | */ | |
7cea05dc | 3066 | if (!WPACKET_put_bytes_u32(pkt, s->hit ? 0 : s->session->timeout) |
a00d75e1 | 3067 | /* Now the actual ticket data */ |
7cea05dc MC |
3068 | || !WPACKET_start_sub_packet_u16(pkt) |
3069 | || !WPACKET_get_total_written(pkt, &macoffset) | |
a00d75e1 | 3070 | /* Output key name */ |
7cea05dc | 3071 | || !WPACKET_memcpy(pkt, key_name, sizeof(key_name)) |
a00d75e1 | 3072 | /* output IV */ |
7cea05dc MC |
3073 | || !WPACKET_memcpy(pkt, iv, iv_len) |
3074 | || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH, | |
a00d75e1 MC |
3075 | &encdata1) |
3076 | /* Encrypt session data */ | |
3077 | || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen) | |
7cea05dc | 3078 | || !WPACKET_allocate_bytes(pkt, len, &encdata2) |
a00d75e1 MC |
3079 | || encdata1 != encdata2 |
3080 | || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal) | |
7cea05dc | 3081 | || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2) |
a00d75e1 MC |
3082 | || encdata1 + len != encdata2 |
3083 | || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH | |
7cea05dc | 3084 | || !WPACKET_get_total_written(pkt, &macendoffset) |
a00d75e1 MC |
3085 | || !HMAC_Update(hctx, |
3086 | (unsigned char *)s->init_buf->data + macoffset, | |
3087 | macendoffset - macoffset) | |
7cea05dc | 3088 | || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1) |
a00d75e1 MC |
3089 | || !HMAC_Final(hctx, macdata1, &hlen) |
3090 | || hlen > EVP_MAX_MD_SIZE | |
7cea05dc | 3091 | || !WPACKET_allocate_bytes(pkt, hlen, &macdata2) |
a00d75e1 | 3092 | || macdata1 != macdata2 |
5923ad4b | 3093 | || !WPACKET_close(pkt)) { |
a00d75e1 | 3094 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_INTERNAL_ERROR); |
e27f234a | 3095 | goto err; |
a00d75e1 | 3096 | } |
bcaad809 DSH |
3097 | EVP_CIPHER_CTX_free(ctx); |
3098 | HMAC_CTX_free(hctx); | |
e27f234a MC |
3099 | OPENSSL_free(senc); |
3100 | ||
3101 | return 1; | |
687eaf27 | 3102 | err: |
b548a1f1 | 3103 | OPENSSL_free(senc); |
846ec07d | 3104 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3105 | HMAC_CTX_free(hctx); |
a00d75e1 | 3106 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
e27f234a | 3107 | return 0; |
0f113f3e | 3108 | } |
67c8e7f4 | 3109 | |
7cea05dc | 3110 | int tls_construct_cert_status(SSL *s, WPACKET *pkt) |
e27f234a | 3111 | { |
5923ad4b | 3112 | if (!WPACKET_put_bytes_u8(pkt, s->tlsext_status_type) |
7cea05dc | 3113 | || !WPACKET_sub_memcpy_u24(pkt, s->tlsext_ocsp_resp, |
5923ad4b | 3114 | s->tlsext_ocsp_resplen)) { |
cc59ad10 MC |
3115 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_STATUS, ERR_R_INTERNAL_ERROR); |
3116 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
cc59ad10 MC |
3117 | return 0; |
3118 | } | |
e27f234a MC |
3119 | |
3120 | return 1; | |
3121 | } | |
3122 | ||
e481f9b9 | 3123 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3124 | /* |
3125 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3126 | * It sets the next_proto member in s if found | |
3127 | */ | |
be3583fa | 3128 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3129 | { |
73999b62 | 3130 | PACKET next_proto, padding; |
e27f234a MC |
3131 | size_t next_proto_len; |
3132 | ||
50e735f9 MC |
3133 | /*- |
3134 | * The payload looks like: | |
3135 | * uint8 proto_len; | |
3136 | * uint8 proto[proto_len]; | |
3137 | * uint8 padding_len; | |
3138 | * uint8 padding[padding_len]; | |
3139 | */ | |
73999b62 MC |
3140 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3141 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3142 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3143 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3144 | goto err; |
cf9b0b6f | 3145 | } |
0f113f3e | 3146 | |
a230b26e | 3147 | if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, &next_proto_len)) { |
6d41fc80 | 3148 | s->next_proto_negotiated_len = 0; |
c3fc7eea MC |
3149 | goto err; |
3150 | } | |
3151 | ||
6d41fc80 | 3152 | s->next_proto_negotiated_len = (unsigned char)next_proto_len; |
0f113f3e | 3153 | |
e27f234a | 3154 | return MSG_PROCESS_CONTINUE_READING; |
a230b26e | 3155 | err: |
fe3a3291 | 3156 | ossl_statem_set_error(s); |
e27f234a | 3157 | return MSG_PROCESS_ERROR; |
0f113f3e | 3158 | } |
6434abbf | 3159 | #endif |
d45ba43d MC |
3160 | |
3161 | #define SSLV2_CIPHER_LEN 3 | |
3162 | ||
38a3cbfb EK |
3163 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3164 | PACKET *cipher_suites, | |
d45ba43d | 3165 | STACK_OF(SSL_CIPHER) **skp, |
a230b26e | 3166 | int sslv2format, int *al) |
d45ba43d MC |
3167 | { |
3168 | const SSL_CIPHER *c; | |
3169 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3170 | int n; |
3171 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3172 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3173 | |
38a3cbfb EK |
3174 | s->s3->send_connection_binding = 0; |
3175 | ||
3176 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3177 | ||
3178 | if (PACKET_remaining(cipher_suites) == 0) { | |
3179 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3180 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3181 | return NULL; | |
d45ba43d | 3182 | } |
38a3cbfb EK |
3183 | |
3184 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3185 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3186 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3187 | *al = SSL_AD_DECODE_ERROR; |
3188 | return NULL; | |
d45ba43d | 3189 | } |
38a3cbfb | 3190 | |
d45ba43d MC |
3191 | if ((skp == NULL) || (*skp == NULL)) { |
3192 | sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */ | |
e8aa8b6c | 3193 | if (sk == NULL) { |
d45ba43d | 3194 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); |
38a3cbfb | 3195 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3196 | return NULL; |
3197 | } | |
3198 | } else { | |
3199 | sk = *skp; | |
3200 | sk_SSL_CIPHER_zero(sk); | |
3201 | } | |
3202 | ||
38a3cbfb EK |
3203 | if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, |
3204 | &s->s3->tmp.ciphers_rawlen)) { | |
3205 | *al = SSL_AD_INTERNAL_ERROR; | |
d45ba43d MC |
3206 | goto err; |
3207 | } | |
d45ba43d | 3208 | |
38a3cbfb EK |
3209 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3210 | /* | |
20218b58 EK |
3211 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3212 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3213 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3214 | */ |
3215 | if (sslv2format && cipher[0] != '\0') | |
a230b26e | 3216 | continue; |
38a3cbfb | 3217 | |
d45ba43d | 3218 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3219 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3220 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3221 | /* SCSV fatal if renegotiating */ |
3222 | if (s->renegotiate) { | |
3223 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3224 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3225 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3226 | goto err; |
3227 | } | |
3228 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3229 | continue; |
3230 | } | |
3231 | ||
3232 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3233 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3234 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3235 | /* |
3236 | * The SCSV indicates that the client previously tried a higher | |
3237 | * version. Fail if the current version is an unexpected | |
3238 | * downgrade. | |
3239 | */ | |
4fa52141 | 3240 | if (!ssl_check_version_downgrade(s)) { |
d45ba43d MC |
3241 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3242 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3243 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3244 | goto err; |
3245 | } | |
d45ba43d MC |
3246 | continue; |
3247 | } | |
3248 | ||
38a3cbfb EK |
3249 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3250 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3251 | if (c != NULL) { |
3252 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3253 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3254 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3255 | goto err; |
3256 | } | |
3257 | } | |
3258 | } | |
38a3cbfb EK |
3259 | if (PACKET_remaining(cipher_suites) > 0) { |
3260 | *al = SSL_AD_INTERNAL_ERROR; | |
3261 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3262 | goto err; | |
3263 | } | |
d45ba43d MC |
3264 | |
3265 | if (skp != NULL) | |
3266 | *skp = sk; | |
3267 | return (sk); | |
3268 | err: | |
3269 | if ((skp == NULL) || (*skp == NULL)) | |
3270 | sk_SSL_CIPHER_free(sk); | |
38a3cbfb | 3271 | return NULL; |
d45ba43d | 3272 | } |