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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 | |
e46f2334 | 64 | static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt); |
7d061fce | 65 | static int tls_construct_hello_retry_request(SSL *s, WPACKET *pkt); |
38a3cbfb EK |
66 | static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
67 | PACKET *cipher_suites, | |
a230b26e EK |
68 | STACK_OF(SSL_CIPHER) |
69 | **skp, int sslv2format, | |
70 | int *al); | |
d45ba43d | 71 | |
61ae935a | 72 | /* |
0f1e51ea MC |
73 | * ossl_statem_server13_read_transition() encapsulates the logic for the allowed |
74 | * handshake state transitions when a TLSv1.3 server is reading messages from | |
75 | * the client. The message type that the client has sent is provided in |mt|. | |
76 | * The current state is in |s->statem.hand_state|. | |
77 | * | |
94ed2c67 MC |
78 | * Return values are 1 for success (transition allowed) and 0 on error |
79 | * (transition not allowed) | |
0f1e51ea MC |
80 | */ |
81 | static int ossl_statem_server13_read_transition(SSL *s, int mt) | |
82 | { | |
83 | OSSL_STATEM *st = &s->statem; | |
84 | ||
85 | /* | |
86 | * Note: There is no case for TLS_ST_BEFORE because at that stage we have | |
87 | * not negotiated TLSv1.3 yet, so that case is handled by | |
88 | * ossl_statem_server_read_transition() | |
89 | */ | |
90 | switch (st->hand_state) { | |
91 | default: | |
92 | break; | |
93 | ||
7d061fce MC |
94 | case TLS_ST_SW_HELLO_RETRY_REQUEST: |
95 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
96 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
97 | return 1; | |
98 | } | |
99 | break; | |
100 | ||
92760c21 | 101 | case TLS_ST_SW_FINISHED: |
0f1e51ea MC |
102 | if (s->s3->tmp.cert_request) { |
103 | if (mt == SSL3_MT_CERTIFICATE) { | |
104 | st->hand_state = TLS_ST_SR_CERT; | |
105 | return 1; | |
106 | } | |
107 | } else { | |
92760c21 MC |
108 | if (mt == SSL3_MT_FINISHED) { |
109 | st->hand_state = TLS_ST_SR_FINISHED; | |
0f1e51ea MC |
110 | return 1; |
111 | } | |
112 | } | |
113 | break; | |
114 | ||
115 | case TLS_ST_SR_CERT: | |
116 | if (s->session->peer == NULL) { | |
92760c21 MC |
117 | if (mt == SSL3_MT_FINISHED) { |
118 | st->hand_state = TLS_ST_SR_FINISHED; | |
0f1e51ea MC |
119 | return 1; |
120 | } | |
121 | } else { | |
122 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
123 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
124 | return 1; | |
125 | } | |
126 | } | |
127 | break; | |
128 | ||
129 | case TLS_ST_SR_CERT_VRFY: | |
0f1e51ea MC |
130 | if (mt == SSL3_MT_FINISHED) { |
131 | st->hand_state = TLS_ST_SR_FINISHED; | |
132 | return 1; | |
133 | } | |
134 | break; | |
0f1e51ea MC |
135 | } |
136 | ||
137 | /* No valid transition found */ | |
138 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); | |
139 | SSLerr(SSL_F_OSSL_STATEM_SERVER13_READ_TRANSITION, | |
140 | SSL_R_UNEXPECTED_MESSAGE); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /* | |
145 | * ossl_statem_server_read_transition() encapsulates the logic for the allowed | |
146 | * handshake state transitions when the server is reading messages from the | |
147 | * client. The message type that the client has sent is provided in |mt|. The | |
148 | * current state is in |s->statem.hand_state|. | |
61ae935a | 149 | * |
94ed2c67 MC |
150 | * Return values are 1 for success (transition allowed) and 0 on error |
151 | * (transition not allowed) | |
61ae935a | 152 | */ |
8481f583 | 153 | int ossl_statem_server_read_transition(SSL *s, int mt) |
61ae935a | 154 | { |
d6f1a6e9 | 155 | OSSL_STATEM *st = &s->statem; |
61ae935a | 156 | |
f5ca0b04 | 157 | if (SSL_IS_TLS13(s)) { |
5abeaf35 MC |
158 | if (!ossl_statem_server13_read_transition(s, mt)) |
159 | goto err; | |
160 | return 1; | |
161 | } | |
0f1e51ea | 162 | |
e8aa8b6c | 163 | switch (st->hand_state) { |
f3b3d7f0 RS |
164 | default: |
165 | break; | |
166 | ||
61ae935a | 167 | case TLS_ST_BEFORE: |
0386aad1 | 168 | case TLS_ST_OK: |
61ae935a MC |
169 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: |
170 | if (mt == SSL3_MT_CLIENT_HELLO) { | |
171 | st->hand_state = TLS_ST_SR_CLNT_HELLO; | |
172 | return 1; | |
173 | } | |
174 | break; | |
175 | ||
176 | case TLS_ST_SW_SRVR_DONE: | |
177 | /* | |
178 | * If we get a CKE message after a ServerDone then either | |
179 | * 1) We didn't request a Certificate | |
180 | * OR | |
181 | * 2) If we did request one then | |
182 | * a) We allow no Certificate to be returned | |
183 | * AND | |
184 | * b) We are running SSL3 (in TLS1.0+ the client must return a 0 | |
185 | * list if we requested a certificate) | |
186 | */ | |
0f512756 MC |
187 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { |
188 | if (s->s3->tmp.cert_request) { | |
189 | if (s->version == SSL3_VERSION) { | |
23dd09b5 MC |
190 | if ((s->verify_mode & SSL_VERIFY_PEER) |
191 | && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
0f512756 MC |
192 | /* |
193 | * This isn't an unexpected message as such - we're just | |
23dd09b5 MC |
194 | * not going to accept it because we require a client |
195 | * cert. | |
0f512756 MC |
196 | */ |
197 | ssl3_send_alert(s, SSL3_AL_FATAL, | |
198 | SSL3_AD_HANDSHAKE_FAILURE); | |
340a2828 | 199 | SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, |
0f512756 MC |
200 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
201 | return 0; | |
202 | } | |
203 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
204 | return 1; | |
205 | } | |
206 | } else { | |
207 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
208 | return 1; | |
209 | } | |
61ae935a MC |
210 | } else if (s->s3->tmp.cert_request) { |
211 | if (mt == SSL3_MT_CERTIFICATE) { | |
212 | st->hand_state = TLS_ST_SR_CERT; | |
213 | return 1; | |
f100b031 | 214 | } |
61ae935a MC |
215 | } |
216 | break; | |
217 | ||
218 | case TLS_ST_SR_CERT: | |
219 | if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { | |
220 | st->hand_state = TLS_ST_SR_KEY_EXCH; | |
221 | return 1; | |
222 | } | |
223 | break; | |
224 | ||
225 | case TLS_ST_SR_KEY_EXCH: | |
226 | /* | |
227 | * We should only process a CertificateVerify message if we have | |
228 | * received a Certificate from the client. If so then |s->session->peer| | |
229 | * will be non NULL. In some instances a CertificateVerify message is | |
230 | * not required even if the peer has sent a Certificate (e.g. such as in | |
a71a4966 | 231 | * the case of static DH). In that case |st->no_cert_verify| should be |
61ae935a MC |
232 | * set. |
233 | */ | |
a71a4966 | 234 | if (s->session->peer == NULL || st->no_cert_verify) { |
61ae935a MC |
235 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { |
236 | /* | |
237 | * For the ECDH ciphersuites when the client sends its ECDH | |
238 | * pub key in a certificate, the CertificateVerify message is | |
239 | * not sent. Also for GOST ciphersuites when the client uses | |
240 | * its key from the certificate for key exchange. | |
241 | */ | |
242 | st->hand_state = TLS_ST_SR_CHANGE; | |
243 | return 1; | |
244 | } | |
245 | } else { | |
246 | if (mt == SSL3_MT_CERTIFICATE_VERIFY) { | |
247 | st->hand_state = TLS_ST_SR_CERT_VRFY; | |
248 | return 1; | |
249 | } | |
250 | } | |
251 | break; | |
252 | ||
253 | case TLS_ST_SR_CERT_VRFY: | |
254 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
255 | st->hand_state = TLS_ST_SR_CHANGE; | |
256 | return 1; | |
257 | } | |
258 | break; | |
259 | ||
260 | case TLS_ST_SR_CHANGE: | |
261 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
aff8c126 | 262 | if (s->s3->npn_seen) { |
61ae935a MC |
263 | if (mt == SSL3_MT_NEXT_PROTO) { |
264 | st->hand_state = TLS_ST_SR_NEXT_PROTO; | |
265 | return 1; | |
266 | } | |
267 | } else { | |
268 | #endif | |
269 | if (mt == SSL3_MT_FINISHED) { | |
270 | st->hand_state = TLS_ST_SR_FINISHED; | |
271 | return 1; | |
272 | } | |
273 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
274 | } | |
275 | #endif | |
276 | break; | |
277 | ||
278 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
279 | case TLS_ST_SR_NEXT_PROTO: | |
280 | if (mt == SSL3_MT_FINISHED) { | |
281 | st->hand_state = TLS_ST_SR_FINISHED; | |
282 | return 1; | |
283 | } | |
284 | break; | |
285 | #endif | |
286 | ||
287 | case TLS_ST_SW_FINISHED: | |
288 | if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
289 | st->hand_state = TLS_ST_SR_CHANGE; | |
290 | return 1; | |
291 | } | |
292 | break; | |
61ae935a MC |
293 | } |
294 | ||
5abeaf35 | 295 | err: |
61ae935a | 296 | /* No valid transition found */ |
672f3337 | 297 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE); |
340a2828 | 298 | SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE); |
61ae935a MC |
299 | return 0; |
300 | } | |
301 | ||
302 | /* | |
303 | * Should we send a ServerKeyExchange message? | |
304 | * | |
305 | * Valid return values are: | |
306 | * 1: Yes | |
307 | * 0: No | |
308 | */ | |
bb3e20cf | 309 | static int send_server_key_exchange(SSL *s) |
61ae935a MC |
310 | { |
311 | unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
312 | ||
313 | /* | |
361a1191 | 314 | * only send a ServerKeyExchange if DH or fortezza but we have a |
61ae935a MC |
315 | * sign only certificate PSK: may send PSK identity hints For |
316 | * ECC ciphersuites, we send a serverKeyExchange message only if | |
317 | * the cipher suite is either ECDH-anon or ECDHE. In other cases, | |
318 | * the server certificate contains the server's public key for | |
319 | * key exchange. | |
320 | */ | |
a230b26e | 321 | if (alg_k & (SSL_kDHE | SSL_kECDHE) |
61ae935a MC |
322 | /* |
323 | * PSK: send ServerKeyExchange if PSK identity hint if | |
324 | * provided | |
325 | */ | |
326 | #ifndef OPENSSL_NO_PSK | |
327 | /* Only send SKE if we have identity hint for plain PSK */ | |
328 | || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) | |
329 | && s->cert->psk_identity_hint) | |
330 | /* For other PSK always send SKE */ | |
331 | || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) | |
332 | #endif | |
333 | #ifndef OPENSSL_NO_SRP | |
334 | /* SRP: send ServerKeyExchange */ | |
335 | || (alg_k & SSL_kSRP) | |
336 | #endif | |
a230b26e | 337 | ) { |
61ae935a MC |
338 | return 1; |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Should we send a CertificateRequest message? | |
346 | * | |
347 | * Valid return values are: | |
348 | * 1: Yes | |
349 | * 0: No | |
350 | */ | |
bb3e20cf | 351 | static int send_certificate_request(SSL *s) |
61ae935a MC |
352 | { |
353 | if ( | |
354 | /* don't request cert unless asked for it: */ | |
355 | s->verify_mode & SSL_VERIFY_PEER | |
356 | /* | |
357 | * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert | |
358 | * during re-negotiation: | |
359 | */ | |
a03a9dbe | 360 | && (s->s3->tmp.finish_md_len == 0 || |
61ae935a MC |
361 | !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) |
362 | /* | |
363 | * never request cert in anonymous ciphersuites (see | |
364 | * section "Certificate request" in SSL 3 drafts and in | |
365 | * RFC 2246): | |
366 | */ | |
367 | && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) | |
a230b26e EK |
368 | /* |
369 | * ... except when the application insists on | |
370 | * verification (against the specs, but statem_clnt.c accepts | |
371 | * this for SSL 3) | |
372 | */ | |
61ae935a MC |
373 | || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) |
374 | /* don't request certificate for SRP auth */ | |
375 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) | |
376 | /* | |
377 | * With normal PSK Certificates and Certificate Requests | |
378 | * are omitted | |
379 | */ | |
b7fa1f98 | 380 | && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { |
61ae935a MC |
381 | return 1; |
382 | } | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | /* | |
0f1e51ea MC |
388 | * ossl_statem_server13_write_transition() works out what handshake state to |
389 | * move to next when a TLSv1.3 server is writing messages to be sent to the | |
390 | * client. | |
0f1e51ea MC |
391 | */ |
392 | static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s) | |
393 | { | |
394 | OSSL_STATEM *st = &s->statem; | |
395 | ||
94ed2c67 MC |
396 | /* |
397 | * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time | |
398 | * we will update this to look more like real TLSv1.3 | |
399 | */ | |
400 | ||
0f1e51ea MC |
401 | /* |
402 | * No case for TLS_ST_BEFORE, because at that stage we have not negotiated | |
403 | * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition() | |
404 | */ | |
405 | ||
406 | switch (st->hand_state) { | |
407 | default: | |
408 | /* Shouldn't happen */ | |
409 | return WRITE_TRAN_ERROR; | |
410 | ||
411 | case TLS_ST_SR_CLNT_HELLO: | |
7d061fce MC |
412 | if (s->hello_retry_request) |
413 | st->hand_state = TLS_ST_SW_HELLO_RETRY_REQUEST; | |
414 | else | |
415 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
0f1e51ea MC |
416 | return WRITE_TRAN_CONTINUE; |
417 | ||
7d061fce MC |
418 | case TLS_ST_SW_HELLO_RETRY_REQUEST: |
419 | return WRITE_TRAN_FINISHED; | |
420 | ||
0f1e51ea | 421 | case TLS_ST_SW_SRVR_HELLO: |
e46f2334 MC |
422 | st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS; |
423 | return WRITE_TRAN_CONTINUE; | |
424 | ||
425 | case TLS_ST_SW_ENCRYPTED_EXTENSIONS: | |
94ed2c67 | 426 | if (s->hit) |
92760c21 MC |
427 | st->hand_state = TLS_ST_SW_FINISHED; |
428 | else if (send_certificate_request(s)) | |
429 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
94ed2c67 | 430 | else |
0f1e51ea | 431 | st->hand_state = TLS_ST_SW_CERT; |
94ed2c67 | 432 | |
0f1e51ea MC |
433 | return WRITE_TRAN_CONTINUE; |
434 | ||
0f1e51ea | 435 | case TLS_ST_SW_CERT_REQ: |
92760c21 | 436 | st->hand_state = TLS_ST_SW_CERT; |
0f1e51ea MC |
437 | return WRITE_TRAN_CONTINUE; |
438 | ||
92760c21 | 439 | case TLS_ST_SW_CERT: |
2c5dfdc3 MC |
440 | st->hand_state = TLS_ST_SW_CERT_VRFY; |
441 | return WRITE_TRAN_CONTINUE; | |
442 | ||
443 | case TLS_ST_SW_CERT_VRFY: | |
d805a57b | 444 | st->hand_state = TLS_ST_SW_FINISHED; |
0f1e51ea MC |
445 | return WRITE_TRAN_CONTINUE; |
446 | ||
447 | case TLS_ST_SW_FINISHED: | |
92760c21 | 448 | return WRITE_TRAN_FINISHED; |
94ed2c67 | 449 | |
92760c21 | 450 | case TLS_ST_SR_FINISHED: |
30f05b19 MC |
451 | /* |
452 | * Technically we have finished the handshake at this point, but we're | |
453 | * going to remain "in_init" for now and write out the session ticket | |
454 | * immediately. | |
455 | * TODO(TLS1.3): Perhaps we need to be able to control this behaviour | |
456 | * and give the application the opportunity to delay sending the | |
457 | * session ticket? | |
458 | */ | |
459 | st->hand_state = TLS_ST_SW_SESSION_TICKET; | |
460 | return WRITE_TRAN_CONTINUE; | |
461 | ||
462 | case TLS_ST_SW_SESSION_TICKET: | |
0f1e51ea MC |
463 | st->hand_state = TLS_ST_OK; |
464 | ossl_statem_set_in_init(s, 0); | |
465 | return WRITE_TRAN_CONTINUE; | |
466 | } | |
467 | } | |
468 | ||
469 | /* | |
470 | * ossl_statem_server_write_transition() works out what handshake state to move | |
471 | * to next when the server is writing messages to be sent to the client. | |
61ae935a | 472 | */ |
8481f583 | 473 | WRITE_TRAN ossl_statem_server_write_transition(SSL *s) |
61ae935a | 474 | { |
d6f1a6e9 | 475 | OSSL_STATEM *st = &s->statem; |
61ae935a | 476 | |
0f1e51ea MC |
477 | /* |
478 | * Note that before the ClientHello we don't know what version we are going | |
479 | * to negotiate yet, so we don't take this branch until later | |
480 | */ | |
481 | ||
f5ca0b04 | 482 | if (SSL_IS_TLS13(s)) |
0f1e51ea MC |
483 | return ossl_statem_server13_write_transition(s); |
484 | ||
e8aa8b6c | 485 | switch (st->hand_state) { |
f3b3d7f0 RS |
486 | default: |
487 | /* Shouldn't happen */ | |
488 | return WRITE_TRAN_ERROR; | |
489 | ||
0386aad1 MC |
490 | case TLS_ST_OK: |
491 | if (st->request_state == TLS_ST_SW_HELLO_REQ) { | |
492 | /* We must be trying to renegotiate */ | |
493 | st->hand_state = TLS_ST_SW_HELLO_REQ; | |
494 | st->request_state = TLS_ST_BEFORE; | |
495 | return WRITE_TRAN_CONTINUE; | |
496 | } | |
c7f47786 MC |
497 | /* Must be an incoming ClientHello */ |
498 | if (!tls_setup_handshake(s)) { | |
499 | ossl_statem_set_error(s); | |
500 | return WRITE_TRAN_ERROR; | |
501 | } | |
0386aad1 MC |
502 | /* Fall through */ |
503 | ||
e8aa8b6c | 504 | case TLS_ST_BEFORE: |
a230b26e | 505 | /* Just go straight to trying to read from the client */ |
e8aa8b6c | 506 | return WRITE_TRAN_FINISHED; |
61ae935a | 507 | |
e8aa8b6c F |
508 | case TLS_ST_SW_HELLO_REQ: |
509 | st->hand_state = TLS_ST_OK; | |
510 | ossl_statem_set_in_init(s, 0); | |
511 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 512 | |
e8aa8b6c F |
513 | case TLS_ST_SR_CLNT_HELLO: |
514 | if (SSL_IS_DTLS(s) && !s->d1->cookie_verified | |
a230b26e | 515 | && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) |
e8aa8b6c F |
516 | st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; |
517 | else | |
518 | st->hand_state = TLS_ST_SW_SRVR_HELLO; | |
519 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 520 | |
e8aa8b6c F |
521 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: |
522 | return WRITE_TRAN_FINISHED; | |
61ae935a | 523 | |
e8aa8b6c F |
524 | case TLS_ST_SW_SRVR_HELLO: |
525 | if (s->hit) { | |
aff8c126 | 526 | if (s->ext.ticket_expected) |
e8aa8b6c F |
527 | st->hand_state = TLS_ST_SW_SESSION_TICKET; |
528 | else | |
529 | st->hand_state = TLS_ST_SW_CHANGE; | |
530 | } else { | |
531 | /* Check if it is anon DH or anon ECDH, */ | |
532 | /* normal PSK or SRP */ | |
533 | if (!(s->s3->tmp.new_cipher->algorithm_auth & | |
a230b26e | 534 | (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { |
e8aa8b6c F |
535 | st->hand_state = TLS_ST_SW_CERT; |
536 | } else if (send_server_key_exchange(s)) { | |
61ae935a | 537 | st->hand_state = TLS_ST_SW_KEY_EXCH; |
e8aa8b6c | 538 | } else if (send_certificate_request(s)) { |
61ae935a | 539 | st->hand_state = TLS_ST_SW_CERT_REQ; |
e8aa8b6c F |
540 | } else { |
541 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
61ae935a | 542 | } |
e8aa8b6c F |
543 | } |
544 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 545 | |
e8aa8b6c | 546 | case TLS_ST_SW_CERT: |
aff8c126 | 547 | if (s->ext.status_expected) { |
e8aa8b6c | 548 | st->hand_state = TLS_ST_SW_CERT_STATUS; |
61ae935a | 549 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
550 | } |
551 | /* Fall through */ | |
61ae935a | 552 | |
e8aa8b6c F |
553 | case TLS_ST_SW_CERT_STATUS: |
554 | if (send_server_key_exchange(s)) { | |
555 | st->hand_state = TLS_ST_SW_KEY_EXCH; | |
61ae935a | 556 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
557 | } |
558 | /* Fall through */ | |
61ae935a | 559 | |
e8aa8b6c F |
560 | case TLS_ST_SW_KEY_EXCH: |
561 | if (send_certificate_request(s)) { | |
562 | st->hand_state = TLS_ST_SW_CERT_REQ; | |
61ae935a | 563 | return WRITE_TRAN_CONTINUE; |
e8aa8b6c F |
564 | } |
565 | /* Fall through */ | |
61ae935a | 566 | |
e8aa8b6c F |
567 | case TLS_ST_SW_CERT_REQ: |
568 | st->hand_state = TLS_ST_SW_SRVR_DONE; | |
569 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 570 | |
e8aa8b6c F |
571 | case TLS_ST_SW_SRVR_DONE: |
572 | return WRITE_TRAN_FINISHED; | |
573 | ||
574 | case TLS_ST_SR_FINISHED: | |
575 | if (s->hit) { | |
61ae935a | 576 | st->hand_state = TLS_ST_OK; |
fe3a3291 | 577 | ossl_statem_set_in_init(s, 0); |
61ae935a | 578 | return WRITE_TRAN_CONTINUE; |
aff8c126 | 579 | } else if (s->ext.ticket_expected) { |
e8aa8b6c F |
580 | st->hand_state = TLS_ST_SW_SESSION_TICKET; |
581 | } else { | |
582 | st->hand_state = TLS_ST_SW_CHANGE; | |
583 | } | |
584 | return WRITE_TRAN_CONTINUE; | |
585 | ||
586 | case TLS_ST_SW_SESSION_TICKET: | |
587 | st->hand_state = TLS_ST_SW_CHANGE; | |
588 | return WRITE_TRAN_CONTINUE; | |
61ae935a | 589 | |
e8aa8b6c F |
590 | case TLS_ST_SW_CHANGE: |
591 | st->hand_state = TLS_ST_SW_FINISHED; | |
592 | return WRITE_TRAN_CONTINUE; | |
593 | ||
594 | case TLS_ST_SW_FINISHED: | |
595 | if (s->hit) { | |
596 | return WRITE_TRAN_FINISHED; | |
597 | } | |
598 | st->hand_state = TLS_ST_OK; | |
599 | ossl_statem_set_in_init(s, 0); | |
600 | return WRITE_TRAN_CONTINUE; | |
61ae935a MC |
601 | } |
602 | } | |
603 | ||
604 | /* | |
605 | * Perform any pre work that needs to be done prior to sending a message from | |
606 | * the server to the client. | |
607 | */ | |
8481f583 | 608 | WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) |
61ae935a | 609 | { |
d6f1a6e9 | 610 | OSSL_STATEM *st = &s->statem; |
61ae935a | 611 | |
e8aa8b6c | 612 | switch (st->hand_state) { |
f3b3d7f0 RS |
613 | default: |
614 | /* No pre work to be done */ | |
615 | break; | |
616 | ||
61ae935a MC |
617 | case TLS_ST_SW_HELLO_REQ: |
618 | s->shutdown = 0; | |
619 | if (SSL_IS_DTLS(s)) | |
f5c7f5df | 620 | dtls1_clear_sent_buffer(s); |
61ae935a MC |
621 | break; |
622 | ||
623 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
624 | s->shutdown = 0; | |
625 | if (SSL_IS_DTLS(s)) { | |
f5c7f5df | 626 | dtls1_clear_sent_buffer(s); |
61ae935a MC |
627 | /* We don't buffer this message so don't use the timer */ |
628 | st->use_timer = 0; | |
629 | } | |
630 | break; | |
631 | ||
632 | case TLS_ST_SW_SRVR_HELLO: | |
633 | if (SSL_IS_DTLS(s)) { | |
634 | /* | |
635 | * Messages we write from now on should be bufferred and | |
636 | * retransmitted if necessary, so we need to use the timer now | |
637 | */ | |
638 | st->use_timer = 1; | |
639 | } | |
640 | break; | |
641 | ||
642 | case TLS_ST_SW_SRVR_DONE: | |
643 | #ifndef OPENSSL_NO_SCTP | |
644 | if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) | |
645 | return dtls_wait_for_dry(s); | |
646 | #endif | |
647 | return WORK_FINISHED_CONTINUE; | |
648 | ||
649 | case TLS_ST_SW_SESSION_TICKET: | |
30f05b19 MC |
650 | if (SSL_IS_TLS13(s)) { |
651 | /* | |
652 | * Actually this is the end of the handshake, but we're going | |
653 | * straight into writing the session ticket out. So we finish off | |
654 | * the handshake, but keep the various buffers active. | |
655 | */ | |
656 | return tls_finish_handshake(s, wst, 0); | |
657 | } if (SSL_IS_DTLS(s)) { | |
61ae935a MC |
658 | /* |
659 | * We're into the last flight. We don't retransmit the last flight | |
660 | * unless we need to, so we don't use the timer | |
661 | */ | |
662 | st->use_timer = 0; | |
663 | } | |
664 | break; | |
665 | ||
666 | case TLS_ST_SW_CHANGE: | |
667 | s->session->cipher = s->s3->tmp.new_cipher; | |
668 | if (!s->method->ssl3_enc->setup_key_block(s)) { | |
fe3a3291 | 669 | ossl_statem_set_error(s); |
61ae935a MC |
670 | return WORK_ERROR; |
671 | } | |
672 | if (SSL_IS_DTLS(s)) { | |
673 | /* | |
674 | * We're into the last flight. We don't retransmit the last flight | |
675 | * unless we need to, so we don't use the timer. This might have | |
676 | * already been set to 0 if we sent a NewSessionTicket message, | |
677 | * but we'll set it again here in case we didn't. | |
678 | */ | |
679 | st->use_timer = 0; | |
680 | } | |
681 | return WORK_FINISHED_CONTINUE; | |
682 | ||
683 | case TLS_ST_OK: | |
30f05b19 | 684 | return tls_finish_handshake(s, wst, 1); |
61ae935a MC |
685 | } |
686 | ||
687 | return WORK_FINISHED_CONTINUE; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Perform any work that needs to be done after sending a message from the | |
692 | * server to the client. | |
693 | */ | |
8481f583 | 694 | WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) |
61ae935a | 695 | { |
d6f1a6e9 | 696 | OSSL_STATEM *st = &s->statem; |
61ae935a MC |
697 | |
698 | s->init_num = 0; | |
699 | ||
e8aa8b6c | 700 | switch (st->hand_state) { |
f3b3d7f0 RS |
701 | default: |
702 | /* No post work to be done */ | |
703 | break; | |
704 | ||
7d061fce MC |
705 | case TLS_ST_SW_HELLO_RETRY_REQUEST: |
706 | if (statem_flush(s) != 1) | |
707 | return WORK_MORE_A; | |
708 | break; | |
709 | ||
61ae935a MC |
710 | case TLS_ST_SW_HELLO_REQ: |
711 | if (statem_flush(s) != 1) | |
712 | return WORK_MORE_A; | |
2c4a056f MC |
713 | if (!ssl3_init_finished_mac(s)) { |
714 | ossl_statem_set_error(s); | |
715 | return WORK_ERROR; | |
716 | } | |
61ae935a MC |
717 | break; |
718 | ||
719 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: | |
720 | if (statem_flush(s) != 1) | |
721 | return WORK_MORE_A; | |
722 | /* HelloVerifyRequest resets Finished MAC */ | |
2c4a056f MC |
723 | if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) { |
724 | ossl_statem_set_error(s); | |
725 | return WORK_ERROR; | |
726 | } | |
61ae935a MC |
727 | /* |
728 | * The next message should be another ClientHello which we need to | |
729 | * treat like it was the first packet | |
730 | */ | |
731 | s->first_packet = 1; | |
732 | break; | |
733 | ||
734 | case TLS_ST_SW_SRVR_HELLO: | |
735 | #ifndef OPENSSL_NO_SCTP | |
736 | if (SSL_IS_DTLS(s) && s->hit) { | |
737 | unsigned char sctpauthkey[64]; | |
738 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
739 | ||
740 | /* | |
741 | * Add new shared key for SCTP-Auth, will be ignored if no | |
742 | * SCTP used. | |
743 | */ | |
141eb8c6 MC |
744 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
745 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
61ae935a MC |
746 | |
747 | if (SSL_export_keying_material(s, sctpauthkey, | |
a230b26e EK |
748 | sizeof(sctpauthkey), labelbuffer, |
749 | sizeof(labelbuffer), NULL, 0, | |
750 | 0) <= 0) { | |
fe3a3291 | 751 | ossl_statem_set_error(s); |
61ae935a MC |
752 | return WORK_ERROR; |
753 | } | |
754 | ||
755 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, | |
756 | sizeof(sctpauthkey), sctpauthkey); | |
757 | } | |
758 | #endif | |
92760c21 MC |
759 | /* |
760 | * TODO(TLS1.3): This actually causes a problem. We don't yet know | |
761 | * whether the next record we are going to receive is an unencrypted | |
762 | * alert, or an encrypted handshake message. We're going to need | |
763 | * something clever in the record layer for this. | |
764 | */ | |
765 | if (SSL_IS_TLS13(s)) { | |
766 | if (!s->method->ssl3_enc->setup_key_block(s) | |
767 | || !s->method->ssl3_enc->change_cipher_state(s, | |
768 | SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE) | |
769 | || !s->method->ssl3_enc->change_cipher_state(s, | |
770 | SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ)) | |
771 | return WORK_ERROR; | |
772 | } | |
61ae935a MC |
773 | break; |
774 | ||
775 | case TLS_ST_SW_CHANGE: | |
776 | #ifndef OPENSSL_NO_SCTP | |
777 | if (SSL_IS_DTLS(s) && !s->hit) { | |
778 | /* | |
779 | * Change to new shared key of SCTP-Auth, will be ignored if | |
780 | * no SCTP used. | |
781 | */ | |
782 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
783 | 0, NULL); | |
784 | } | |
785 | #endif | |
786 | if (!s->method->ssl3_enc->change_cipher_state(s, | |
a230b26e EK |
787 | SSL3_CHANGE_CIPHER_SERVER_WRITE)) |
788 | { | |
fe3a3291 | 789 | ossl_statem_set_error(s); |
61ae935a MC |
790 | return WORK_ERROR; |
791 | } | |
792 | ||
793 | if (SSL_IS_DTLS(s)) | |
794 | dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); | |
795 | break; | |
796 | ||
797 | case TLS_ST_SW_SRVR_DONE: | |
798 | if (statem_flush(s) != 1) | |
799 | return WORK_MORE_A; | |
800 | break; | |
801 | ||
802 | case TLS_ST_SW_FINISHED: | |
803 | if (statem_flush(s) != 1) | |
804 | return WORK_MORE_A; | |
805 | #ifndef OPENSSL_NO_SCTP | |
806 | if (SSL_IS_DTLS(s) && s->hit) { | |
807 | /* | |
808 | * Change to new shared key of SCTP-Auth, will be ignored if | |
809 | * no SCTP used. | |
810 | */ | |
811 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, | |
812 | 0, NULL); | |
813 | } | |
814 | #endif | |
92760c21 MC |
815 | if (SSL_IS_TLS13(s)) { |
816 | if (!s->method->ssl3_enc->generate_master_secret(s, | |
ec15acb6 | 817 | s->master_secret, s->handshake_secret, 0, |
92760c21 MC |
818 | &s->session->master_key_length) |
819 | || !s->method->ssl3_enc->change_cipher_state(s, | |
820 | SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE)) | |
821 | return WORK_ERROR; | |
822 | } | |
61ae935a | 823 | break; |
30f05b19 MC |
824 | |
825 | case TLS_ST_SW_SESSION_TICKET: | |
826 | if (SSL_IS_TLS13(s) && statem_flush(s) != 1) | |
827 | return WORK_MORE_A; | |
828 | break; | |
61ae935a MC |
829 | } |
830 | ||
831 | return WORK_FINISHED_CONTINUE; | |
832 | } | |
833 | ||
834 | /* | |
6392fb8e MC |
835 | * Get the message construction function and message type for sending from the |
836 | * server | |
61ae935a MC |
837 | * |
838 | * Valid return values are: | |
839 | * 1: Success | |
840 | * 0: Error | |
841 | */ | |
6392fb8e | 842 | int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt, |
a15c953f | 843 | confunc_f *confunc, int *mt) |
61ae935a | 844 | { |
d6f1a6e9 | 845 | OSSL_STATEM *st = &s->statem; |
61ae935a | 846 | |
4a01c59f MC |
847 | switch (st->hand_state) { |
848 | default: | |
849 | /* Shouldn't happen */ | |
850 | return 0; | |
851 | ||
852 | case TLS_ST_SW_CHANGE: | |
5923ad4b | 853 | if (SSL_IS_DTLS(s)) |
6392fb8e | 854 | *confunc = dtls_construct_change_cipher_spec; |
4a01c59f | 855 | else |
6392fb8e MC |
856 | *confunc = tls_construct_change_cipher_spec; |
857 | *mt = SSL3_MT_CHANGE_CIPHER_SPEC; | |
4a01c59f | 858 | break; |
f3b3d7f0 | 859 | |
4a01c59f | 860 | case DTLS_ST_SW_HELLO_VERIFY_REQUEST: |
6392fb8e MC |
861 | *confunc = dtls_construct_hello_verify_request; |
862 | *mt = DTLS1_MT_HELLO_VERIFY_REQUEST; | |
4a01c59f | 863 | break; |
61ae935a | 864 | |
4a01c59f MC |
865 | case TLS_ST_SW_HELLO_REQ: |
866 | /* No construction function needed */ | |
6392fb8e MC |
867 | *confunc = NULL; |
868 | *mt = SSL3_MT_HELLO_REQUEST; | |
4a01c59f | 869 | break; |
61ae935a | 870 | |
4a01c59f | 871 | case TLS_ST_SW_SRVR_HELLO: |
6392fb8e MC |
872 | *confunc = tls_construct_server_hello; |
873 | *mt = SSL3_MT_SERVER_HELLO; | |
4a01c59f | 874 | break; |
61ae935a | 875 | |
4a01c59f | 876 | case TLS_ST_SW_CERT: |
6392fb8e MC |
877 | *confunc = tls_construct_server_certificate; |
878 | *mt = SSL3_MT_CERTIFICATE; | |
4a01c59f | 879 | break; |
61ae935a | 880 | |
2c5dfdc3 MC |
881 | case TLS_ST_SW_CERT_VRFY: |
882 | *confunc = tls_construct_cert_verify; | |
883 | *mt = SSL3_MT_CERTIFICATE_VERIFY; | |
884 | break; | |
885 | ||
886 | ||
4a01c59f | 887 | case TLS_ST_SW_KEY_EXCH: |
6392fb8e MC |
888 | *confunc = tls_construct_server_key_exchange; |
889 | *mt = SSL3_MT_SERVER_KEY_EXCHANGE; | |
4a01c59f | 890 | break; |
61ae935a | 891 | |
4a01c59f | 892 | case TLS_ST_SW_CERT_REQ: |
6392fb8e MC |
893 | *confunc = tls_construct_certificate_request; |
894 | *mt = SSL3_MT_CERTIFICATE_REQUEST; | |
4a01c59f | 895 | break; |
61ae935a | 896 | |
4a01c59f | 897 | case TLS_ST_SW_SRVR_DONE: |
6392fb8e MC |
898 | *confunc = tls_construct_server_done; |
899 | *mt = SSL3_MT_SERVER_DONE; | |
4a01c59f | 900 | break; |
61ae935a | 901 | |
4a01c59f | 902 | case TLS_ST_SW_SESSION_TICKET: |
6392fb8e MC |
903 | *confunc = tls_construct_new_session_ticket; |
904 | *mt = SSL3_MT_NEWSESSION_TICKET; | |
4a01c59f | 905 | break; |
61ae935a | 906 | |
4a01c59f | 907 | case TLS_ST_SW_CERT_STATUS: |
6392fb8e MC |
908 | *confunc = tls_construct_cert_status; |
909 | *mt = SSL3_MT_CERTIFICATE_STATUS; | |
4a01c59f | 910 | break; |
61ae935a | 911 | |
4a01c59f | 912 | case TLS_ST_SW_FINISHED: |
6392fb8e MC |
913 | *confunc = tls_construct_finished; |
914 | *mt = SSL3_MT_FINISHED; | |
4a01c59f | 915 | break; |
e46f2334 MC |
916 | |
917 | case TLS_ST_SW_ENCRYPTED_EXTENSIONS: | |
918 | *confunc = tls_construct_encrypted_extensions; | |
919 | *mt = SSL3_MT_ENCRYPTED_EXTENSIONS; | |
920 | break; | |
7d061fce MC |
921 | |
922 | case TLS_ST_SW_HELLO_RETRY_REQUEST: | |
923 | *confunc = tls_construct_hello_retry_request; | |
924 | *mt = SSL3_MT_HELLO_RETRY_REQUEST; | |
925 | break; | |
4a01c59f | 926 | } |
61ae935a | 927 | |
5923ad4b | 928 | return 1; |
61ae935a MC |
929 | } |
930 | ||
8a18bc25 AG |
931 | /* |
932 | * Maximum size (excluding the Handshake header) of a ClientHello message, | |
933 | * calculated as follows: | |
934 | * | |
935 | * 2 + # client_version | |
936 | * 32 + # only valid length for random | |
937 | * 1 + # length of session_id | |
938 | * 32 + # maximum size for session_id | |
939 | * 2 + # length of cipher suites | |
940 | * 2^16-2 + # maximum length of cipher suites array | |
941 | * 1 + # length of compression_methods | |
942 | * 2^8-1 + # maximum length of compression methods | |
943 | * 2 + # length of extensions | |
944 | * 2^16-1 # maximum length of extensions | |
945 | */ | |
946 | #define CLIENT_HELLO_MAX_LENGTH 131396 | |
947 | ||
61ae935a MC |
948 | #define CLIENT_KEY_EXCH_MAX_LENGTH 2048 |
949 | #define NEXT_PROTO_MAX_LENGTH 514 | |
950 | ||
951 | /* | |
952 | * Returns the maximum allowed length for the current message that we are | |
953 | * reading. Excludes the message header. | |
954 | */ | |
eda75751 | 955 | size_t ossl_statem_server_max_message_size(SSL *s) |
61ae935a | 956 | { |
d6f1a6e9 | 957 | OSSL_STATEM *st = &s->statem; |
61ae935a | 958 | |
e8aa8b6c | 959 | switch (st->hand_state) { |
f3b3d7f0 RS |
960 | default: |
961 | /* Shouldn't happen */ | |
962 | return 0; | |
963 | ||
61ae935a | 964 | case TLS_ST_SR_CLNT_HELLO: |
8a18bc25 | 965 | return CLIENT_HELLO_MAX_LENGTH; |
61ae935a MC |
966 | |
967 | case TLS_ST_SR_CERT: | |
968 | return s->max_cert_list; | |
969 | ||
970 | case TLS_ST_SR_KEY_EXCH: | |
971 | return CLIENT_KEY_EXCH_MAX_LENGTH; | |
972 | ||
973 | case TLS_ST_SR_CERT_VRFY: | |
974 | return SSL3_RT_MAX_PLAIN_LENGTH; | |
975 | ||
976 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
977 | case TLS_ST_SR_NEXT_PROTO: | |
978 | return NEXT_PROTO_MAX_LENGTH; | |
979 | #endif | |
980 | ||
981 | case TLS_ST_SR_CHANGE: | |
982 | return CCS_MAX_LENGTH; | |
983 | ||
984 | case TLS_ST_SR_FINISHED: | |
985 | return FINISHED_MAX_LENGTH; | |
61ae935a | 986 | } |
61ae935a MC |
987 | } |
988 | ||
989 | /* | |
990 | * Process a message that the server has received from the client. | |
991 | */ | |
8481f583 | 992 | MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) |
61ae935a | 993 | { |
d6f1a6e9 | 994 | OSSL_STATEM *st = &s->statem; |
61ae935a | 995 | |
e8aa8b6c | 996 | switch (st->hand_state) { |
f3b3d7f0 RS |
997 | default: |
998 | /* Shouldn't happen */ | |
999 | return MSG_PROCESS_ERROR; | |
1000 | ||
61ae935a MC |
1001 | case TLS_ST_SR_CLNT_HELLO: |
1002 | return tls_process_client_hello(s, pkt); | |
1003 | ||
1004 | case TLS_ST_SR_CERT: | |
1005 | return tls_process_client_certificate(s, pkt); | |
1006 | ||
1007 | case TLS_ST_SR_KEY_EXCH: | |
1008 | return tls_process_client_key_exchange(s, pkt); | |
1009 | ||
1010 | case TLS_ST_SR_CERT_VRFY: | |
1011 | return tls_process_cert_verify(s, pkt); | |
1012 | ||
1013 | #ifndef OPENSSL_NO_NEXTPROTONEG | |
1014 | case TLS_ST_SR_NEXT_PROTO: | |
1015 | return tls_process_next_proto(s, pkt); | |
1016 | #endif | |
1017 | ||
1018 | case TLS_ST_SR_CHANGE: | |
1019 | return tls_process_change_cipher_spec(s, pkt); | |
1020 | ||
1021 | case TLS_ST_SR_FINISHED: | |
1022 | return tls_process_finished(s, pkt); | |
61ae935a | 1023 | } |
61ae935a MC |
1024 | } |
1025 | ||
1026 | /* | |
1027 | * Perform any further processing required following the receipt of a message | |
1028 | * from the client | |
1029 | */ | |
8481f583 | 1030 | WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) |
61ae935a | 1031 | { |
d6f1a6e9 | 1032 | OSSL_STATEM *st = &s->statem; |
61ae935a | 1033 | |
e8aa8b6c | 1034 | switch (st->hand_state) { |
f3b3d7f0 RS |
1035 | default: |
1036 | /* Shouldn't happen */ | |
1037 | return WORK_ERROR; | |
1038 | ||
61ae935a MC |
1039 | case TLS_ST_SR_CLNT_HELLO: |
1040 | return tls_post_process_client_hello(s, wst); | |
1041 | ||
1042 | case TLS_ST_SR_KEY_EXCH: | |
1043 | return tls_post_process_client_key_exchange(s, wst); | |
1044 | ||
1045 | case TLS_ST_SR_CERT_VRFY: | |
1046 | #ifndef OPENSSL_NO_SCTP | |
a230b26e EK |
1047 | if ( /* Is this SCTP? */ |
1048 | BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
1049 | /* Are we renegotiating? */ | |
1050 | && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
61ae935a MC |
1051 | s->s3->in_read_app_data = 2; |
1052 | s->rwstate = SSL_READING; | |
1053 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
1054 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 1055 | ossl_statem_set_sctp_read_sock(s, 1); |
61ae935a MC |
1056 | return WORK_MORE_A; |
1057 | } else { | |
d99b0691 | 1058 | ossl_statem_set_sctp_read_sock(s, 0); |
61ae935a MC |
1059 | } |
1060 | #endif | |
1061 | return WORK_FINISHED_CONTINUE; | |
61ae935a | 1062 | } |
92760c21 | 1063 | return WORK_FINISHED_CONTINUE; |
61ae935a MC |
1064 | } |
1065 | ||
edc032b5 | 1066 | #ifndef OPENSSL_NO_SRP |
71fa4513 | 1067 | static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) |
0f113f3e MC |
1068 | { |
1069 | int ret = SSL_ERROR_NONE; | |
1070 | ||
1071 | *al = SSL_AD_UNRECOGNIZED_NAME; | |
1072 | ||
1073 | if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && | |
1074 | (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { | |
1075 | if (s->srp_ctx.login == NULL) { | |
1076 | /* | |
1077 | * RFC 5054 says SHOULD reject, we do so if There is no srp | |
1078 | * login name | |
1079 | */ | |
1080 | ret = SSL3_AL_FATAL; | |
1081 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
1082 | } else { | |
1083 | ret = SSL_srp_server_param_with_username(s, al); | |
1084 | } | |
1085 | } | |
1086 | return ret; | |
1087 | } | |
edc032b5 BL |
1088 | #endif |
1089 | ||
c536b6be | 1090 | int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie, |
cb150cbc | 1091 | size_t cookie_len) |
8ba708e5 | 1092 | { |
8ba708e5 | 1093 | /* Always use DTLS 1.0 version: see RFC 6347 */ |
c536b6be MC |
1094 | if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION) |
1095 | || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len)) | |
1096 | return 0; | |
8ba708e5 | 1097 | |
c536b6be | 1098 | return 1; |
8ba708e5 MC |
1099 | } |
1100 | ||
7cea05dc | 1101 | int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt) |
8ba708e5 | 1102 | { |
cb150cbc | 1103 | unsigned int cookie_leni; |
8ba708e5 MC |
1104 | if (s->ctx->app_gen_cookie_cb == NULL || |
1105 | s->ctx->app_gen_cookie_cb(s, s->d1->cookie, | |
cb150cbc MC |
1106 | &cookie_leni) == 0 || |
1107 | cookie_leni > 255) { | |
f0659bdb | 1108 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, |
8ba708e5 | 1109 | SSL_R_COOKIE_GEN_CALLBACK_FAILURE); |
8ba708e5 MC |
1110 | return 0; |
1111 | } | |
cb150cbc | 1112 | s->d1->cookie_len = cookie_leni; |
8ba708e5 | 1113 | |
4a01c59f MC |
1114 | if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie, |
1115 | s->d1->cookie_len)) { | |
c536b6be | 1116 | SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR); |
c536b6be MC |
1117 | return 0; |
1118 | } | |
8ba708e5 | 1119 | |
8ba708e5 MC |
1120 | return 1; |
1121 | } | |
1122 | ||
805a2e9e MC |
1123 | #ifndef OPENSSL_NO_EC |
1124 | /*- | |
1125 | * ssl_check_for_safari attempts to fingerprint Safari using OS X | |
1126 | * SecureTransport using the TLS extension block in |hello|. | |
1127 | * Safari, since 10.6, sends exactly these extensions, in this order: | |
1128 | * SNI, | |
1129 | * elliptic_curves | |
1130 | * ec_point_formats | |
1131 | * | |
1132 | * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8, | |
1133 | * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them. | |
1134 | * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from | |
1135 | * 10.8..10.8.3 (which don't work). | |
1136 | */ | |
1137 | static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello) | |
1138 | { | |
805a2e9e MC |
1139 | static const unsigned char kSafariExtensionsBlock[] = { |
1140 | 0x00, 0x0a, /* elliptic_curves extension */ | |
1141 | 0x00, 0x08, /* 8 bytes */ | |
1142 | 0x00, 0x06, /* 6 bytes of curve ids */ | |
1143 | 0x00, 0x17, /* P-256 */ | |
1144 | 0x00, 0x18, /* P-384 */ | |
1145 | 0x00, 0x19, /* P-521 */ | |
1146 | ||
1147 | 0x00, 0x0b, /* ec_point_formats */ | |
1148 | 0x00, 0x02, /* 2 bytes */ | |
1149 | 0x01, /* 1 point format */ | |
1150 | 0x00, /* uncompressed */ | |
1151 | /* The following is only present in TLS 1.2 */ | |
1152 | 0x00, 0x0d, /* signature_algorithms */ | |
1153 | 0x00, 0x0c, /* 12 bytes */ | |
1154 | 0x00, 0x0a, /* 10 bytes */ | |
1155 | 0x05, 0x01, /* SHA-384/RSA */ | |
1156 | 0x04, 0x01, /* SHA-256/RSA */ | |
1157 | 0x02, 0x01, /* SHA-1/RSA */ | |
1158 | 0x04, 0x03, /* SHA-256/ECDSA */ | |
1159 | 0x02, 0x03, /* SHA-1/ECDSA */ | |
1160 | }; | |
805a2e9e MC |
1161 | /* Length of the common prefix (first two extensions). */ |
1162 | static const size_t kSafariCommonExtensionsLength = 18; | |
1266eefd MC |
1163 | unsigned int type; |
1164 | PACKET sni, tmppkt; | |
1165 | size_t ext_len; | |
805a2e9e MC |
1166 | |
1167 | tmppkt = hello->extensions; | |
1168 | ||
1169 | if (!PACKET_forward(&tmppkt, 2) | |
1170 | || !PACKET_get_net_2(&tmppkt, &type) | |
1171 | || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) { | |
1172 | return; | |
6b473aca MC |
1173 | } |
1174 | ||
805a2e9e MC |
1175 | if (type != TLSEXT_TYPE_server_name) |
1176 | return; | |
1177 | ||
1178 | ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ? | |
1179 | sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength; | |
1180 | ||
1181 | s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock, | |
1182 | ext_len); | |
6b473aca | 1183 | } |
805a2e9e | 1184 | #endif /* !OPENSSL_NO_EC */ |
6b473aca | 1185 | |
be3583fa | 1186 | MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) |
e27f234a MC |
1187 | { |
1188 | int i, al = SSL_AD_INTERNAL_ERROR; | |
348240c6 | 1189 | unsigned int j; |
1ab3836b | 1190 | size_t loop; |
e27f234a | 1191 | unsigned long id; |
4a640fb6 | 1192 | const SSL_CIPHER *c; |
e27f234a MC |
1193 | #ifndef OPENSSL_NO_COMP |
1194 | SSL_COMP *comp = NULL; | |
1195 | #endif | |
1196 | STACK_OF(SSL_CIPHER) *ciphers = NULL; | |
4fa52141 | 1197 | int protverr; |
e27f234a | 1198 | /* |cookie| will only be initialized for DTLS. */ |
1ab3836b | 1199 | PACKET session_id, compression, extensions, cookie; |
6e3ff632 | 1200 | static const unsigned char null_compression = 0; |
1ab3836b | 1201 | CLIENTHELLO_MSG clienthello; |
e27f234a | 1202 | |
c7f47786 MC |
1203 | /* Check if this is actually an unexpected renegotiation ClientHello */ |
1204 | if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) { | |
1205 | s->renegotiate = 1; | |
1206 | s->new_session = 1; | |
1207 | } | |
1208 | ||
1209 | /* This is a real handshake so make sure we clean it up at the end */ | |
1210 | s->statem.cleanuphand = 1; | |
1211 | ||
1ab3836b | 1212 | /* |
b1b4b543 | 1213 | * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure. |
1ab3836b | 1214 | */ |
9529419d | 1215 | memset(&clienthello, 0, sizeof(clienthello)); |
1ab3836b | 1216 | clienthello.isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer); |
bbafa47b | 1217 | PACKET_null_init(&cookie); |
1ab3836b MC |
1218 | |
1219 | if (clienthello.isv2) { | |
9ceb2426 | 1220 | unsigned int mt; |
b1b4b543 | 1221 | |
7d061fce MC |
1222 | if (!SSL_IS_FIRST_HANDSHAKE(s) || s->hello_retry_request) { |
1223 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1224 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNEXPECTED_MESSAGE); | |
1225 | goto f_err; | |
1226 | } | |
1227 | ||
32ec4153 MC |
1228 | /*- |
1229 | * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 | |
1230 | * header is sent directly on the wire, not wrapped as a TLS | |
1231 | * record. Our record layer just processes the message length and passes | |
1232 | * the rest right through. Its format is: | |
1233 | * Byte Content | |
1234 | * 0-1 msg_length - decoded by the record layer | |
1235 | * 2 msg_type - s->init_msg points here | |
1236 | * 3-4 version | |
1237 | * 5-6 cipher_spec_length | |
1238 | * 7-8 session_id_length | |
1239 | * 9-10 challenge_length | |
1240 | * ... ... | |
1241 | */ | |
1242 | ||
73999b62 | 1243 | if (!PACKET_get_1(pkt, &mt) |
a230b26e | 1244 | || mt != SSL2_MT_CLIENT_HELLO) { |
32ec4153 MC |
1245 | /* |
1246 | * Should never happen. We should have tested this in the record | |
1247 | * layer in order to have determined that this is a SSLv2 record | |
1248 | * in the first place | |
1249 | */ | |
e27f234a | 1250 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
d45ba43d | 1251 | goto err; |
32ec4153 | 1252 | } |
32ec4153 MC |
1253 | } |
1254 | ||
df7ce507 | 1255 | if (!PACKET_get_net_2(pkt, &clienthello.legacy_version)) { |
1ab3836b MC |
1256 | al = SSL_AD_DECODE_ERROR; |
1257 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); | |
1258 | goto err; | |
0f113f3e MC |
1259 | } |
1260 | ||
b3e2272c | 1261 | /* Parse the message and load client random. */ |
1ab3836b | 1262 | if (clienthello.isv2) { |
32ec4153 MC |
1263 | /* |
1264 | * Handle an SSLv2 backwards compatible ClientHello | |
1265 | * Note, this is only for SSLv3+ using the backward compatible format. | |
e2994cf0 | 1266 | * Real SSLv2 is not supported, and is rejected below. |
32ec4153 | 1267 | */ |
1ab3836b | 1268 | unsigned int ciphersuite_len, session_id_len, challenge_len; |
b3e2272c | 1269 | PACKET challenge; |
0f113f3e | 1270 | |
1ab3836b | 1271 | if (!PACKET_get_net_2(pkt, &ciphersuite_len) |
a230b26e EK |
1272 | || !PACKET_get_net_2(pkt, &session_id_len) |
1273 | || !PACKET_get_net_2(pkt, &challenge_len)) { | |
e27f234a MC |
1274 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1275 | SSL_R_RECORD_LENGTH_MISMATCH); | |
6c3cca57 AE |
1276 | al = SSL_AD_DECODE_ERROR; |
1277 | goto f_err; | |
5e9f0eeb | 1278 | } |
0f113f3e | 1279 | |
293b5ca4 AG |
1280 | if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) { |
1281 | al = SSL_AD_DECODE_ERROR; | |
1282 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1283 | goto f_err; | |
1284 | } | |
1285 | ||
1ab3836b MC |
1286 | if (!PACKET_get_sub_packet(pkt, &clienthello.ciphersuites, |
1287 | ciphersuite_len) | |
035b1e69 | 1288 | || !PACKET_copy_bytes(pkt, clienthello.session_id, session_id_len) |
73999b62 | 1289 | || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) |
b3e2272c | 1290 | /* No extensions. */ |
73999b62 | 1291 | || PACKET_remaining(pkt) != 0) { |
f0659bdb MC |
1292 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
1293 | SSL_R_RECORD_LENGTH_MISMATCH); | |
9ceb2426 MC |
1294 | al = SSL_AD_DECODE_ERROR; |
1295 | goto f_err; | |
1296 | } | |
035b1e69 | 1297 | clienthello.session_id_len = session_id_len; |
9ceb2426 | 1298 | |
fba7b84c MC |
1299 | /* Load the client random and compression list. We use SSL3_RANDOM_SIZE |
1300 | * here rather than sizeof(clienthello.random) because that is the limit | |
1301 | * for SSLv3 and it is fixed. It won't change even if | |
1302 | * sizeof(clienthello.random) does. | |
1303 | */ | |
1304 | challenge_len = challenge_len > SSL3_RANDOM_SIZE | |
1305 | ? SSL3_RANDOM_SIZE : challenge_len; | |
1306 | memset(clienthello.random, 0, SSL3_RANDOM_SIZE); | |
b3e2272c | 1307 | if (!PACKET_copy_bytes(&challenge, |
fba7b84c | 1308 | clienthello.random + SSL3_RANDOM_SIZE - |
cb21df32 DB |
1309 | challenge_len, challenge_len) |
1310 | /* Advertise only null compression. */ | |
1311 | || !PACKET_buf_init(&compression, &null_compression, 1)) { | |
f0659bdb | 1312 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
b3e2272c | 1313 | al = SSL_AD_INTERNAL_ERROR; |
9ceb2426 MC |
1314 | goto f_err; |
1315 | } | |
b3e2272c | 1316 | |
1ab3836b | 1317 | PACKET_null_init(&clienthello.extensions); |
0f113f3e | 1318 | } else { |
b3e2272c | 1319 | /* Regular ClientHello. */ |
1ab3836b | 1320 | if (!PACKET_copy_bytes(pkt, clienthello.random, SSL3_RANDOM_SIZE) |
e2994cf0 MC |
1321 | || !PACKET_get_length_prefixed_1(pkt, &session_id) |
1322 | || !PACKET_copy_all(&session_id, clienthello.session_id, | |
1323 | SSL_MAX_SSL_SESSION_ID_LENGTH, | |
1324 | &clienthello.session_id_len)) { | |
9ceb2426 | 1325 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1326 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
9ceb2426 MC |
1327 | goto f_err; |
1328 | } | |
32ec4153 | 1329 | |
b3e2272c | 1330 | if (SSL_IS_DTLS(s)) { |
73999b62 | 1331 | if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { |
32ec4153 | 1332 | al = SSL_AD_DECODE_ERROR; |
f0659bdb | 1333 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |
32ec4153 MC |
1334 | goto f_err; |
1335 | } | |
1ab3836b MC |
1336 | if (!PACKET_copy_all(&cookie, clienthello.dtls_cookie, |
1337 | DTLS1_COOKIE_LENGTH, | |
1338 | &clienthello.dtls_cookie_len)) { | |
1339 | al = SSL_AD_DECODE_ERROR; | |
1340 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1341 | goto f_err; | |
1342 | } | |
b3e2272c EK |
1343 | /* |
1344 | * If we require cookies and this ClientHello doesn't contain one, | |
1345 | * just return since we do not want to allocate any memory yet. | |
1346 | * So check cookie length... | |
1347 | */ | |
1348 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1ab3836b | 1349 | if (clienthello.dtls_cookie_len == 0) |
a230b26e | 1350 | return 1; |
b3e2272c | 1351 | } |
5e9f0eeb | 1352 | } |
0f113f3e | 1353 | |
1ab3836b MC |
1354 | if (!PACKET_get_length_prefixed_2(pkt, &clienthello.ciphersuites)) { |
1355 | al = SSL_AD_DECODE_ERROR; | |
1356 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1357 | goto f_err; | |
1358 | } | |
1359 | ||
4bfe1432 | 1360 | if (!PACKET_get_length_prefixed_1(pkt, &compression)) { |
a230b26e EK |
1361 | al = SSL_AD_DECODE_ERROR; |
1362 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1363 | goto f_err; | |
b3e2272c | 1364 | } |
1ab3836b | 1365 | |
b3e2272c | 1366 | /* Could be empty. */ |
1ab3836b MC |
1367 | if (PACKET_remaining(pkt) == 0) { |
1368 | PACKET_null_init(&clienthello.extensions); | |
1369 | } else { | |
1370 | if (!PACKET_get_length_prefixed_2(pkt, &clienthello.extensions)) { | |
1371 | al = SSL_AD_DECODE_ERROR; | |
1372 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1373 | goto f_err; | |
1374 | } | |
1375 | } | |
1376 | } | |
1377 | ||
4bfe1432 | 1378 | if (!PACKET_copy_all(&compression, clienthello.compressions, |
e2994cf0 MC |
1379 | MAX_COMPRESSIONS_SIZE, |
1380 | &clienthello.compressions_len)) { | |
1ab3836b MC |
1381 | al = SSL_AD_DECODE_ERROR; |
1382 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); | |
1383 | goto f_err; | |
1384 | } | |
1385 | ||
b1b4b543 | 1386 | /* Preserve the raw extensions PACKET for later use */ |
1ab3836b | 1387 | extensions = clienthello.extensions; |
fadd9a1e | 1388 | if (!tls_collect_extensions(s, &extensions, EXT_CLIENT_HELLO, |
70af3d8e | 1389 | &clienthello.pre_proc_exts, &al)) { |
1ab3836b MC |
1390 | /* SSLerr already been called */ |
1391 | goto f_err; | |
1392 | } | |
1393 | ||
1394 | /* Finished parsing the ClientHello, now we can start processing it */ | |
1395 | ||
1396 | /* Set up the client_random */ | |
1397 | memcpy(s->s3->client_random, clienthello.random, SSL3_RANDOM_SIZE); | |
1398 | ||
1399 | /* Choose the version */ | |
1400 | ||
1401 | if (clienthello.isv2) { | |
df7ce507 MC |
1402 | if (clienthello.legacy_version == SSL2_VERSION |
1403 | || (clienthello.legacy_version & 0xff00) | |
b1b4b543 MC |
1404 | != (SSL3_VERSION_MAJOR << 8)) { |
1405 | /* | |
1406 | * This is real SSLv2 or something complete unknown. We don't | |
1407 | * support it. | |
1408 | */ | |
1ab3836b MC |
1409 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); |
1410 | goto err; | |
1411 | } | |
b1b4b543 | 1412 | /* SSLv3/TLS */ |
df7ce507 | 1413 | s->client_version = clienthello.legacy_version; |
1ab3836b MC |
1414 | } |
1415 | /* | |
1416 | * Do SSL/TLS version negotiation if applicable. For DTLS we just check | |
1417 | * versions are potentially compatible. Version negotiation comes later. | |
1418 | */ | |
1419 | if (!SSL_IS_DTLS(s)) { | |
1420 | protverr = ssl_choose_server_version(s, &clienthello); | |
1421 | } else if (s->method->version != DTLS_ANY_VERSION && | |
df7ce507 | 1422 | DTLS_VERSION_LT((int)clienthello.legacy_version, s->version)) { |
1ab3836b MC |
1423 | protverr = SSL_R_VERSION_TOO_LOW; |
1424 | } else { | |
1425 | protverr = 0; | |
1426 | } | |
1427 | ||
1428 | if (protverr) { | |
1429 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
7d061fce | 1430 | if (SSL_IS_FIRST_HANDSHAKE(s)) { |
b1b4b543 | 1431 | /* like ssl3_get_record, send alert using remote version number */ |
df7ce507 | 1432 | s->version = s->client_version = clienthello.legacy_version; |
1ab3836b MC |
1433 | } |
1434 | al = SSL_AD_PROTOCOL_VERSION; | |
1435 | goto f_err; | |
b3e2272c EK |
1436 | } |
1437 | ||
1ed65871 DB |
1438 | if (SSL_IS_DTLS(s)) { |
1439 | /* Empty cookie was already handled above by returning early. */ | |
1440 | if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { | |
1441 | if (s->ctx->app_verify_cookie_cb != NULL) { | |
1ab3836b MC |
1442 | if (s->ctx->app_verify_cookie_cb(s, clienthello.dtls_cookie, |
1443 | clienthello.dtls_cookie_len) == 0) { | |
1ed65871 DB |
1444 | al = SSL_AD_HANDSHAKE_FAILURE; |
1445 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, | |
1446 | SSL_R_COOKIE_MISMATCH); | |
1447 | goto f_err; | |
1448 | /* else cookie verification succeeded */ | |
1449 | } | |
a230b26e | 1450 | /* default verification */ |
1ab3836b MC |
1451 | } else if (s->d1->cookie_len != clienthello.dtls_cookie_len |
1452 | || memcmp(clienthello.dtls_cookie, s->d1->cookie, | |
1453 | s->d1->cookie_len) != 0) { | |
1ed65871 DB |
1454 | al = SSL_AD_HANDSHAKE_FAILURE; |
1455 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); | |
1456 | goto f_err; | |
1457 | } | |
1458 | s->d1->cookie_verified = 1; | |
1459 | } | |
1460 | if (s->method->version == DTLS_ANY_VERSION) { | |
1ab3836b | 1461 | protverr = ssl_choose_server_version(s, &clienthello); |
1ed65871 DB |
1462 | if (protverr != 0) { |
1463 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr); | |
1464 | s->version = s->client_version; | |
1465 | al = SSL_AD_PROTOCOL_VERSION; | |
1466 | goto f_err; | |
1467 | } | |
1468 | } | |
1469 | } | |
1470 | ||
b3e2272c EK |
1471 | s->hit = 0; |
1472 | ||
1ab3836b | 1473 | /* We need to do this before getting the session */ |
70af3d8e | 1474 | if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret, |
4b299b8e | 1475 | EXT_CLIENT_HELLO, |
f97d4c37 | 1476 | clienthello.pre_proc_exts, NULL, 0, &al)) { |
1ab3836b MC |
1477 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
1478 | goto f_err; | |
1479 | } | |
1480 | ||
b3e2272c EK |
1481 | /* |
1482 | * We don't allow resumption in a backwards compatible ClientHello. | |
1483 | * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. | |
1484 | * | |
1485 | * Versions before 0.9.7 always allow clients to resume sessions in | |
1486 | * renegotiation. 0.9.7 and later allow this by default, but optionally | |
1487 | * ignore resumption requests with flag | |
1488 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather | |
1489 | * than a change to default behavior so that applications relying on | |
1490 | * this for security won't even compile against older library versions). | |
1491 | * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to | |
1492 | * request renegotiation but not a new session (s->new_session remains | |
1493 | * unset): for servers, this essentially just means that the | |
1494 | * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be | |
1495 | * ignored. | |
1496 | */ | |
1ab3836b | 1497 | if (clienthello.isv2 || |
b3e2272c EK |
1498 | (s->new_session && |
1499 | (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { | |
1500 | if (!ssl_get_new_session(s, 1)) | |
1501 | goto err; | |
1502 | } else { | |
1a9f457c | 1503 | i = ssl_get_prev_session(s, &clienthello, &al); |
128ae276 | 1504 | if (i == 1) { |
b3e2272c EK |
1505 | /* previous session */ |
1506 | s->hit = 1; | |
1507 | } else if (i == -1) { | |
1a9f457c | 1508 | goto f_err; |
32ec4153 | 1509 | } else { |
b3e2272c EK |
1510 | /* i == 0 */ |
1511 | if (!ssl_get_new_session(s, 1)) | |
32ec4153 | 1512 | goto err; |
0f113f3e | 1513 | } |
b3e2272c | 1514 | } |
0f113f3e | 1515 | |
b1b4b543 | 1516 | if (ssl_bytes_to_cipher_list(s, &clienthello.ciphersuites, &ciphers, |
1ab3836b | 1517 | clienthello.isv2, &al) == NULL) { |
b3e2272c EK |
1518 | goto f_err; |
1519 | } | |
5e9f0eeb | 1520 | |
b3e2272c EK |
1521 | /* If it is a hit, check that the cipher is in the list */ |
1522 | if (s->hit) { | |
1523 | j = 0; | |
1524 | id = s->session->cipher->id; | |
d02b48c6 | 1525 | |
413c4f45 | 1526 | #ifdef CIPHER_DEBUG |
a230b26e | 1527 | fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers)); |
413c4f45 | 1528 | #endif |
b3e2272c EK |
1529 | for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { |
1530 | c = sk_SSL_CIPHER_value(ciphers, i); | |
413c4f45 | 1531 | #ifdef CIPHER_DEBUG |
b3e2272c EK |
1532 | fprintf(stderr, "client [%2d of %2d]:%s\n", |
1533 | i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); | |
88f2a4cf | 1534 | #endif |
b3e2272c EK |
1535 | if (c->id == id) { |
1536 | j = 1; | |
1537 | break; | |
32ec4153 | 1538 | } |
0f113f3e | 1539 | } |
b3e2272c | 1540 | if (j == 0) { |
ec30e856 | 1541 | /* |
b3e2272c EK |
1542 | * we need to have the cipher in the cipher list if we are asked |
1543 | * to reuse it | |
ec30e856 | 1544 | */ |
b3e2272c | 1545 | al = SSL_AD_ILLEGAL_PARAMETER; |
f0659bdb | 1546 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
b3e2272c | 1547 | SSL_R_REQUIRED_CIPHER_MISSING); |
32ec4153 MC |
1548 | goto f_err; |
1549 | } | |
b3e2272c | 1550 | } |
9ceb2426 | 1551 | |
1ab3836b MC |
1552 | for (loop = 0; loop < clienthello.compressions_len; loop++) { |
1553 | if (clienthello.compressions[loop] == 0) | |
b3e2272c | 1554 | break; |
0f113f3e | 1555 | } |
32ec4153 | 1556 | |
1ab3836b | 1557 | if (loop >= clienthello.compressions_len) { |
b3e2272c EK |
1558 | /* no compress */ |
1559 | al = SSL_AD_DECODE_ERROR; | |
f0659bdb | 1560 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED); |
b3e2272c EK |
1561 | goto f_err; |
1562 | } | |
f100b031 | 1563 | |
805a2e9e MC |
1564 | #ifndef OPENSSL_NO_EC |
1565 | if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG) | |
1566 | ssl_check_for_safari(s, &clienthello); | |
1567 | #endif /* !OPENSSL_NO_EC */ | |
1568 | ||
0f113f3e | 1569 | /* TLS extensions */ |
24b8e4b2 | 1570 | if (!tls_parse_all_extensions(s, EXT_CLIENT_HELLO, |
f97d4c37 | 1571 | clienthello.pre_proc_exts, NULL, 0, &al)) { |
1ab3836b | 1572 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT); |
24b8e4b2 | 1573 | goto f_err; |
0f113f3e MC |
1574 | } |
1575 | ||
1576 | /* | |
1577 | * Check if we want to use external pre-shared secret for this handshake | |
1578 | * for not reused session only. We need to generate server_random before | |
1579 | * calling tls_session_secret_cb in order to allow SessionTicket | |
1580 | * processing to use it in key derivation. | |
1581 | */ | |
1582 | { | |
1583 | unsigned char *pos; | |
1584 | pos = s->s3->server_random; | |
1585 | if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { | |
1586 | goto f_err; | |
1587 | } | |
1588 | } | |
1589 | ||
aff8c126 | 1590 | if (!s->hit && s->version >= TLS1_VERSION && s->ext.session_secret_cb) { |
4a640fb6 | 1591 | const SSL_CIPHER *pref_cipher = NULL; |
8c1a5343 MC |
1592 | /* |
1593 | * s->session->master_key_length is a size_t, but this is an int for | |
1594 | * backwards compat reasons | |
1595 | */ | |
1596 | int master_key_length; | |
0f113f3e | 1597 | |
8c1a5343 | 1598 | master_key_length = sizeof(s->session->master_key); |
aff8c126 | 1599 | if (s->ext.session_secret_cb(s, s->session->master_key, |
8c1a5343 | 1600 | &master_key_length, ciphers, |
0f113f3e | 1601 | &pref_cipher, |
aff8c126 | 1602 | s->ext.session_secret_cb_arg) |
8c1a5343 MC |
1603 | && master_key_length > 0) { |
1604 | s->session->master_key_length = master_key_length; | |
0f113f3e MC |
1605 | s->hit = 1; |
1606 | s->session->ciphers = ciphers; | |
1607 | s->session->verify_result = X509_V_OK; | |
1608 | ||
1609 | ciphers = NULL; | |
1610 | ||
1611 | /* check if some cipher was preferred by call back */ | |
3f4bf115 DSH |
1612 | if (pref_cipher == NULL) |
1613 | pref_cipher = ssl3_choose_cipher(s, s->session->ciphers, | |
1614 | SSL_get_ciphers(s)); | |
0f113f3e MC |
1615 | if (pref_cipher == NULL) { |
1616 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 1617 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER); |
0f113f3e MC |
1618 | goto f_err; |
1619 | } | |
1620 | ||
1621 | s->session->cipher = pref_cipher; | |
25aaa98a | 1622 | sk_SSL_CIPHER_free(s->cipher_list); |
0f113f3e | 1623 | s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); |
25aaa98a | 1624 | sk_SSL_CIPHER_free(s->cipher_list_by_id); |
0f113f3e MC |
1625 | s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); |
1626 | } | |
1627 | } | |
58ece833 | 1628 | |
0f113f3e MC |
1629 | /* |
1630 | * Worst case, we will use the NULL compression, but if we have other | |
b2ce0337 | 1631 | * options, we will now look for them. We have complen-1 compression |
0f113f3e MC |
1632 | * algorithms from the client, starting at q. |
1633 | */ | |
1634 | s->s3->tmp.new_compression = NULL; | |
09b6c2ef | 1635 | #ifndef OPENSSL_NO_COMP |
0f113f3e MC |
1636 | /* This only happens if we have a cache hit */ |
1637 | if (s->session->compress_meth != 0) { | |
1638 | int m, comp_id = s->session->compress_meth; | |
9ceb2426 | 1639 | unsigned int k; |
0f113f3e MC |
1640 | /* Perform sanity checks on resumed compression algorithm */ |
1641 | /* Can't disable compression */ | |
1642 | if (!ssl_allow_compression(s)) { | |
e27f234a | 1643 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1644 | SSL_R_INCONSISTENT_COMPRESSION); |
1645 | goto f_err; | |
1646 | } | |
1647 | /* Look for resumed compression method */ | |
1648 | for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { | |
1649 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1650 | if (comp_id == comp->id) { | |
1651 | s->s3->tmp.new_compression = comp; | |
1652 | break; | |
1653 | } | |
1654 | } | |
1655 | if (s->s3->tmp.new_compression == NULL) { | |
e27f234a | 1656 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
0f113f3e MC |
1657 | SSL_R_INVALID_COMPRESSION_ALGORITHM); |
1658 | goto f_err; | |
1659 | } | |
1660 | /* Look for resumed method in compression list */ | |
1ab3836b MC |
1661 | for (k = 0; k < clienthello.compressions_len; k++) { |
1662 | if (clienthello.compressions[k] == comp_id) | |
0f113f3e MC |
1663 | break; |
1664 | } | |
1ab3836b | 1665 | if (k >= clienthello.compressions_len) { |
0f113f3e | 1666 | al = SSL_AD_ILLEGAL_PARAMETER; |
e27f234a | 1667 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, |
8fdc99cb | 1668 | SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING); |
0f113f3e MC |
1669 | goto f_err; |
1670 | } | |
1671 | } else if (s->hit) | |
1672 | comp = NULL; | |
1673 | else if (ssl_allow_compression(s) && s->ctx->comp_methods) { | |
df6741c9 | 1674 | /* See if we have a match */ |
9ceb2426 MC |
1675 | int m, nn, v, done = 0; |
1676 | unsigned int o; | |
0f113f3e MC |
1677 | |
1678 | nn = sk_SSL_COMP_num(s->ctx->comp_methods); | |
1679 | for (m = 0; m < nn; m++) { | |
1680 | comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); | |
1681 | v = comp->id; | |
1ab3836b MC |
1682 | for (o = 0; o < clienthello.compressions_len; o++) { |
1683 | if (v == clienthello.compressions[o]) { | |
0f113f3e MC |
1684 | done = 1; |
1685 | break; | |
1686 | } | |
1687 | } | |
1688 | if (done) | |
1689 | break; | |
1690 | } | |
1691 | if (done) | |
1692 | s->s3->tmp.new_compression = comp; | |
1693 | else | |
1694 | comp = NULL; | |
1695 | } | |
e6f418bc | 1696 | #else |
0f113f3e MC |
1697 | /* |
1698 | * If compression is disabled we'd better not try to resume a session | |
1699 | * using compression. | |
1700 | */ | |
1701 | if (s->session->compress_meth != 0) { | |
e27f234a | 1702 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION); |
0f113f3e MC |
1703 | goto f_err; |
1704 | } | |
09b6c2ef | 1705 | #endif |
413c4f45 | 1706 | |
0f113f3e MC |
1707 | /* |
1708 | * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher | |
1709 | */ | |
d02b48c6 | 1710 | |
0f113f3e | 1711 | if (!s->hit) { |
09b6c2ef | 1712 | #ifdef OPENSSL_NO_COMP |
0f113f3e | 1713 | s->session->compress_meth = 0; |
09b6c2ef | 1714 | #else |
0f113f3e | 1715 | s->session->compress_meth = (comp == NULL) ? 0 : comp->id; |
09b6c2ef | 1716 | #endif |
25aaa98a | 1717 | sk_SSL_CIPHER_free(s->session->ciphers); |
0f113f3e MC |
1718 | s->session->ciphers = ciphers; |
1719 | if (ciphers == NULL) { | |
3ae91cfb | 1720 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 1721 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1722 | goto f_err; |
1723 | } | |
1724 | ciphers = NULL; | |
1725 | if (!tls1_set_server_sigalgs(s)) { | |
e27f234a | 1726 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); |
0f113f3e MC |
1727 | goto err; |
1728 | } | |
e27f234a MC |
1729 | } |
1730 | ||
1731 | sk_SSL_CIPHER_free(ciphers); | |
9529419d | 1732 | OPENSSL_free(clienthello.pre_proc_exts); |
e27f234a MC |
1733 | return MSG_PROCESS_CONTINUE_PROCESSING; |
1734 | f_err: | |
1735 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1736 | err: | |
fe3a3291 | 1737 | ossl_statem_set_error(s); |
e27f234a MC |
1738 | |
1739 | sk_SSL_CIPHER_free(ciphers); | |
9529419d | 1740 | OPENSSL_free(clienthello.pre_proc_exts); |
e27f234a | 1741 | |
58c9e32a | 1742 | return MSG_PROCESS_ERROR; |
e27f234a MC |
1743 | } |
1744 | ||
24b8e4b2 MC |
1745 | /* |
1746 | * Call the status request callback if needed. Upon success, returns 1. | |
1266eefd | 1747 | * Upon failure, returns 0 and sets |*al| to the appropriate fatal alert. |
24b8e4b2 MC |
1748 | */ |
1749 | static int tls_handle_status_request(SSL *s, int *al) | |
1750 | { | |
aff8c126 | 1751 | s->ext.status_expected = 0; |
24b8e4b2 MC |
1752 | |
1753 | /* | |
1754 | * If status request then ask callback what to do. Note: this must be | |
1755 | * called after servername callbacks in case the certificate has changed, | |
1756 | * and must be called after the cipher has been chosen because this may | |
1757 | * influence which certificate is sent | |
1758 | */ | |
aff8c126 RS |
1759 | if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx != NULL |
1760 | && s->ctx->ext.status_cb != NULL) { | |
24b8e4b2 | 1761 | int ret; |
1266eefd | 1762 | |
24b8e4b2 | 1763 | /* If no certificate can't return certificate status */ |
a497cf25 | 1764 | if (s->s3->tmp.cert != NULL) { |
24b8e4b2 MC |
1765 | /* |
1766 | * Set current certificate to one we will use so SSL_get_certificate | |
1767 | * et al can pick it up. | |
1768 | */ | |
a497cf25 | 1769 | s->cert->key = s->s3->tmp.cert; |
aff8c126 | 1770 | ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg); |
24b8e4b2 MC |
1771 | switch (ret) { |
1772 | /* We don't want to send a status request response */ | |
1773 | case SSL_TLSEXT_ERR_NOACK: | |
aff8c126 | 1774 | s->ext.status_expected = 0; |
24b8e4b2 MC |
1775 | break; |
1776 | /* status request response should be sent */ | |
1777 | case SSL_TLSEXT_ERR_OK: | |
aff8c126 RS |
1778 | if (s->ext.ocsp.resp) |
1779 | s->ext.status_expected = 1; | |
24b8e4b2 MC |
1780 | break; |
1781 | /* something bad happened */ | |
1782 | case SSL_TLSEXT_ERR_ALERT_FATAL: | |
1783 | default: | |
1784 | *al = SSL_AD_INTERNAL_ERROR; | |
1785 | return 0; | |
1786 | } | |
1787 | } | |
1788 | } | |
1789 | ||
1790 | return 1; | |
1791 | } | |
1792 | ||
be3583fa | 1793 | WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) |
e27f234a | 1794 | { |
d13dd4be | 1795 | int al = SSL_AD_HANDSHAKE_FAILURE; |
4a640fb6 | 1796 | const SSL_CIPHER *cipher; |
e27f234a MC |
1797 | |
1798 | if (wst == WORK_MORE_A) { | |
1799 | if (!s->hit) { | |
1800 | /* Let cert callback update server certificates if required */ | |
1801 | if (s->cert->cert_cb) { | |
1802 | int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); | |
1803 | if (rv == 0) { | |
1804 | al = SSL_AD_INTERNAL_ERROR; | |
a230b26e EK |
1805 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1806 | SSL_R_CERT_CB_ERROR); | |
e27f234a MC |
1807 | goto f_err; |
1808 | } | |
1809 | if (rv < 0) { | |
1810 | s->rwstate = SSL_X509_LOOKUP; | |
1811 | return WORK_MORE_A; | |
1812 | } | |
1813 | s->rwstate = SSL_NOTHING; | |
0f113f3e | 1814 | } |
a230b26e EK |
1815 | cipher = |
1816 | ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); | |
e27f234a MC |
1817 | |
1818 | if (cipher == NULL) { | |
a230b26e EK |
1819 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, |
1820 | SSL_R_NO_SHARED_CIPHER); | |
e27f234a | 1821 | goto f_err; |
0f113f3e | 1822 | } |
e27f234a | 1823 | s->s3->tmp.new_cipher = cipher; |
4a419f60 | 1824 | if (!tls_choose_sigalg(s, &al)) |
56723275 | 1825 | goto f_err; |
e27f234a MC |
1826 | /* check whether we should disable session resumption */ |
1827 | if (s->not_resumable_session_cb != NULL) | |
24b8e4b2 MC |
1828 | s->session->not_resumable = |
1829 | s->not_resumable_session_cb(s, ((cipher->algorithm_mkey | |
1830 | & (SSL_kDHE | SSL_kECDHE)) | |
1831 | != 0)); | |
e27f234a MC |
1832 | if (s->session->not_resumable) |
1833 | /* do not send a session ticket */ | |
aff8c126 | 1834 | s->ext.ticket_expected = 0; |
e27f234a MC |
1835 | } else { |
1836 | /* Session-id reuse */ | |
1837 | s->s3->tmp.new_cipher = s->session->cipher; | |
0f113f3e | 1838 | } |
0f113f3e | 1839 | |
e27f234a MC |
1840 | /*- |
1841 | * we now have the following setup. | |
1842 | * client_random | |
60250017 | 1843 | * cipher_list - our preferred list of ciphers |
1844 | * ciphers - the clients preferred list of ciphers | |
e27f234a MC |
1845 | * compression - basically ignored right now |
1846 | * ssl version is set - sslv3 | |
1847 | * s->session - The ssl session has been setup. | |
1848 | * s->hit - session reuse flag | |
1849 | * s->s3->tmp.new_cipher- the new cipher to use. | |
1850 | */ | |
0f113f3e | 1851 | |
24b8e4b2 MC |
1852 | /* |
1853 | * Call status_request callback if needed. Has to be done after the | |
1854 | * certificate callbacks etc above. | |
1855 | */ | |
1856 | if (!tls_handle_status_request(s, &al)) { | |
1857 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1858 | SSL_R_CLIENTHELLO_TLSEXT); | |
1859 | goto f_err; | |
e27f234a | 1860 | } |
0f113f3e | 1861 | |
e27f234a MC |
1862 | wst = WORK_MORE_B; |
1863 | } | |
1864 | #ifndef OPENSSL_NO_SRP | |
1865 | if (wst == WORK_MORE_B) { | |
1866 | int ret; | |
1867 | if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { | |
1868 | /* | |
1869 | * callback indicates further work to be done | |
1870 | */ | |
1871 | s->rwstate = SSL_X509_LOOKUP; | |
1872 | return WORK_MORE_B; | |
1873 | } | |
1874 | if (ret != SSL_ERROR_NONE) { | |
1875 | /* | |
1876 | * This is not really an error but the only means to for | |
1877 | * a client to detect whether srp is supported. | |
1878 | */ | |
1879 | if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) | |
1880 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
a230b26e | 1881 | SSL_R_CLIENTHELLO_TLSEXT); |
7bb37cb5 E |
1882 | else |
1883 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, | |
1884 | SSL_R_PSK_IDENTITY_NOT_FOUND); | |
e27f234a | 1885 | goto f_err; |
0f113f3e MC |
1886 | } |
1887 | } | |
e27f234a | 1888 | #endif |
0f113f3e | 1889 | |
e27f234a | 1890 | return WORK_FINISHED_STOP; |
0f113f3e | 1891 | f_err: |
e27f234a | 1892 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 1893 | ossl_statem_set_error(s); |
e27f234a MC |
1894 | return WORK_ERROR; |
1895 | } | |
1896 | ||
7cea05dc | 1897 | int tls_construct_server_hello(SSL *s, WPACKET *pkt) |
0f113f3e | 1898 | { |
ec60ccc1 MC |
1899 | int compm, al = SSL_AD_INTERNAL_ERROR; |
1900 | size_t sl, len; | |
f2342b7a | 1901 | int version; |
0f113f3e | 1902 | |
b97667ce | 1903 | /* TODO(TLS1.3): Remove the DRAFT conditional before release */ |
f2342b7a MC |
1904 | version = SSL_IS_TLS13(s) ? TLS1_3_VERSION_DRAFT : s->version; |
1905 | if (!WPACKET_put_bytes_u16(pkt, version) | |
8157d44b MC |
1906 | /* |
1907 | * Random stuff. Filling of the server_random takes place in | |
1908 | * tls_process_client_hello() | |
1909 | */ | |
7cea05dc | 1910 | || !WPACKET_memcpy(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) { |
8157d44b MC |
1911 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
1912 | goto err; | |
1913 | } | |
0f113f3e | 1914 | |
e27f234a MC |
1915 | /*- |
1916 | * There are several cases for the session ID to send | |
1917 | * back in the server hello: | |
1918 | * - For session reuse from the session cache, | |
1919 | * we send back the old session ID. | |
1920 | * - If stateless session reuse (using a session ticket) | |
1921 | * is successful, we send back the client's "session ID" | |
1922 | * (which doesn't actually identify the session). | |
1923 | * - If it is a new session, we send back the new | |
1924 | * session ID. | |
1925 | * - However, if we want the new session to be single-use, | |
1926 | * we send back a 0-length session ID. | |
1927 | * s->hit is non-zero in either case of session reuse, | |
1928 | * so the following won't overwrite an ID that we're supposed | |
1929 | * to send back. | |
1930 | */ | |
1931 | if (s->session->not_resumable || | |
1932 | (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) | |
1933 | && !s->hit)) | |
1934 | s->session->session_id_length = 0; | |
1935 | ||
1936 | sl = s->session->session_id_length; | |
ec60ccc1 | 1937 | if (sl > sizeof(s->session->session_id)) { |
e27f234a | 1938 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
8157d44b | 1939 | goto err; |
e27f234a | 1940 | } |
0f113f3e | 1941 | |
8157d44b | 1942 | /* set up the compression method */ |
09b6c2ef | 1943 | #ifdef OPENSSL_NO_COMP |
8157d44b | 1944 | compm = 0; |
09b6c2ef | 1945 | #else |
e27f234a | 1946 | if (s->s3->tmp.new_compression == NULL) |
8157d44b | 1947 | compm = 0; |
e27f234a | 1948 | else |
8157d44b | 1949 | compm = s->s3->tmp.new_compression->id; |
09b6c2ef | 1950 | #endif |
e481f9b9 | 1951 | |
71728dd8 MC |
1952 | if ((!SSL_IS_TLS13(s) |
1953 | && !WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl)) | |
7cea05dc | 1954 | || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len) |
71728dd8 MC |
1955 | || (!SSL_IS_TLS13(s) |
1956 | && !WPACKET_put_bytes_u8(pkt, compm)) | |
7da160b0 | 1957 | || !tls_construct_extensions(s, pkt, |
3434f40b | 1958 | SSL_IS_TLS13(s) |
1266eefd | 1959 | ? EXT_TLS1_3_SERVER_HELLO |
30aeba43 MC |
1960 | : EXT_TLS1_2_SERVER_HELLO, |
1961 | NULL, 0, &al)) { | |
e27f234a | 1962 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR); |
8157d44b | 1963 | goto err; |
0f113f3e | 1964 | } |
d02b48c6 | 1965 | |
aff9929b MC |
1966 | if (!(s->verify_mode & SSL_VERIFY_PEER) |
1967 | && !ssl3_digest_cached_records(s, 0)) { | |
1968 | al = SSL_AD_INTERNAL_ERROR; | |
1969 | goto err; | |
1970 | } | |
1971 | ||
e27f234a | 1972 | return 1; |
8157d44b | 1973 | err: |
7da160b0 | 1974 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
8157d44b | 1975 | return 0; |
0f113f3e | 1976 | } |
d02b48c6 | 1977 | |
7cea05dc | 1978 | int tls_construct_server_done(SSL *s, WPACKET *pkt) |
e27f234a | 1979 | { |
e27f234a | 1980 | if (!s->s3->tmp.cert_request) { |
5923ad4b MC |
1981 | if (!ssl3_digest_cached_records(s, 0)) { |
1982 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); | |
1983 | return 0; | |
1984 | } | |
e27f234a | 1985 | } |
e27f234a MC |
1986 | return 1; |
1987 | } | |
1988 | ||
7cea05dc | 1989 | int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt) |
0f113f3e | 1990 | { |
bc36ee62 | 1991 | #ifndef OPENSSL_NO_DH |
e2b420fd | 1992 | EVP_PKEY *pkdh = NULL; |
ea262260 | 1993 | #endif |
10bf4fc2 | 1994 | #ifndef OPENSSL_NO_EC |
0f113f3e | 1995 | unsigned char *encodedPoint = NULL; |
348240c6 | 1996 | size_t encodedlen = 0; |
0f113f3e | 1997 | int curve_id = 0; |
d02b48c6 | 1998 | #endif |
f695571e | 1999 | const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg; |
c13d2a5b | 2000 | int al = SSL_AD_INTERNAL_ERROR, i; |
0f113f3e | 2001 | unsigned long type; |
2ac6115d | 2002 | const BIGNUM *r[4]; |
bfb0641f | 2003 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
fe3066ee | 2004 | EVP_PKEY_CTX *pctx = NULL; |
c13d2a5b MC |
2005 | size_t paramlen, paramoffset; |
2006 | ||
5923ad4b | 2007 | if (!WPACKET_get_total_written(pkt, ¶moffset)) { |
e4e1aa90 | 2008 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
c13d2a5b MC |
2009 | goto f_err; |
2010 | } | |
0f113f3e | 2011 | |
6e59a892 RL |
2012 | if (md_ctx == NULL) { |
2013 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); | |
6e59a892 RL |
2014 | goto f_err; |
2015 | } | |
0f113f3e | 2016 | |
e27f234a | 2017 | type = s->s3->tmp.new_cipher->algorithm_mkey; |
e27f234a | 2018 | |
e27f234a | 2019 | r[0] = r[1] = r[2] = r[3] = NULL; |
85269210 | 2020 | #ifndef OPENSSL_NO_PSK |
e27f234a MC |
2021 | /* Plain PSK or RSAPSK nothing to do */ |
2022 | if (type & (SSL_kPSK | SSL_kRSAPSK)) { | |
2023 | } else | |
85269210 | 2024 | #endif /* !OPENSSL_NO_PSK */ |
bc36ee62 | 2025 | #ifndef OPENSSL_NO_DH |
e27f234a | 2026 | if (type & (SSL_kDHE | SSL_kDHEPSK)) { |
94d61512 BL |
2027 | CERT *cert = s->cert; |
2028 | ||
e2b420fd DSH |
2029 | EVP_PKEY *pkdhp = NULL; |
2030 | DH *dh; | |
2031 | ||
e27f234a | 2032 | if (s->cert->dh_tmp_auto) { |
e2b420fd DSH |
2033 | DH *dhp = ssl_get_auto_dh(s); |
2034 | pkdh = EVP_PKEY_new(); | |
2035 | if (pkdh == NULL || dhp == NULL) { | |
2036 | DH_free(dhp); | |
e27f234a | 2037 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
0f113f3e | 2038 | ERR_R_INTERNAL_ERROR); |
e27f234a | 2039 | goto f_err; |
0f113f3e | 2040 | } |
e2b420fd DSH |
2041 | EVP_PKEY_assign_DH(pkdh, dhp); |
2042 | pkdhp = pkdh; | |
2043 | } else { | |
2044 | pkdhp = cert->dh_tmp; | |
2045 | } | |
2046 | if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { | |
2047 | DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); | |
2048 | pkdh = ssl_dh_to_pkey(dhp); | |
2049 | if (pkdh == NULL) { | |
e2b420fd DSH |
2050 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2051 | ERR_R_INTERNAL_ERROR); | |
2052 | goto f_err; | |
2053 | } | |
2054 | pkdhp = pkdh; | |
2055 | } | |
2056 | if (pkdhp == NULL) { | |
e27f234a MC |
2057 | al = SSL_AD_HANDSHAKE_FAILURE; |
2058 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2059 | SSL_R_MISSING_TMP_DH_KEY); | |
2060 | goto f_err; | |
2061 | } | |
2062 | if (!ssl_security(s, SSL_SECOP_TMP_DH, | |
e2b420fd | 2063 | EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { |
e27f234a MC |
2064 | al = SSL_AD_HANDSHAKE_FAILURE; |
2065 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2066 | SSL_R_DH_KEY_TOO_SMALL); | |
2067 | goto f_err; | |
2068 | } | |
e2b420fd | 2069 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
2070 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2071 | ERR_R_INTERNAL_ERROR); | |
2072 | goto err; | |
2073 | } | |
0f113f3e | 2074 | |
0a699a07 | 2075 | s->s3->tmp.pkey = ssl_generate_pkey(pkdhp); |
e27f234a | 2076 | |
e2b420fd DSH |
2077 | if (s->s3->tmp.pkey == NULL) { |
2078 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); | |
ffaef3f1 | 2079 | goto err; |
e27f234a | 2080 | } |
e2b420fd DSH |
2081 | |
2082 | dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); | |
2083 | ||
2084 | EVP_PKEY_free(pkdh); | |
2085 | pkdh = NULL; | |
2086 | ||
0aeddcfa MC |
2087 | DH_get0_pqg(dh, &r[0], NULL, &r[1]); |
2088 | DH_get0_key(dh, &r[2], NULL); | |
e27f234a | 2089 | } else |
d02b48c6 | 2090 | #endif |
10bf4fc2 | 2091 | #ifndef OPENSSL_NO_EC |
e27f234a | 2092 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
57be4444 | 2093 | int nid; |
e27f234a | 2094 | |
880d9d86 | 2095 | if (s->s3->tmp.pkey != NULL) { |
e27f234a MC |
2096 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2097 | ERR_R_INTERNAL_ERROR); | |
2098 | goto err; | |
2099 | } | |
2100 | ||
57be4444 | 2101 | /* Get NID of appropriate shared curve */ |
de4d764e | 2102 | nid = tls1_shared_group(s, -2); |
57be4444 DSH |
2103 | curve_id = tls1_ec_nid2curve_id(nid); |
2104 | if (curve_id == 0) { | |
e27f234a MC |
2105 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2106 | SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); | |
2107 | goto err; | |
2108 | } | |
0a699a07 | 2109 | s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id); |
880d9d86 DSH |
2110 | /* Generate a new key for this curve */ |
2111 | if (s->s3->tmp.pkey == NULL) { | |
880d9d86 | 2112 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB); |
57be4444 DSH |
2113 | goto f_err; |
2114 | } | |
2115 | ||
880d9d86 | 2116 | /* Encode the public key. */ |
ec24630a DSH |
2117 | encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey, |
2118 | &encodedPoint); | |
e27f234a | 2119 | if (encodedlen == 0) { |
cae41364 | 2120 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); |
e27f234a MC |
2121 | goto err; |
2122 | } | |
0f113f3e | 2123 | |
e27f234a MC |
2124 | /* |
2125 | * We'll generate the serverKeyExchange message explicitly so we | |
2126 | * can set these to NULLs | |
2127 | */ | |
2128 | r[0] = NULL; | |
2129 | r[1] = NULL; | |
2130 | r[2] = NULL; | |
2131 | r[3] = NULL; | |
2132 | } else | |
10bf4fc2 | 2133 | #endif /* !OPENSSL_NO_EC */ |
edc032b5 | 2134 | #ifndef OPENSSL_NO_SRP |
e27f234a MC |
2135 | if (type & SSL_kSRP) { |
2136 | if ((s->srp_ctx.N == NULL) || | |
2137 | (s->srp_ctx.g == NULL) || | |
2138 | (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { | |
2139 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2140 | SSL_R_MISSING_SRP_PARAM); | |
2141 | goto err; | |
0f113f3e | 2142 | } |
e27f234a MC |
2143 | r[0] = s->srp_ctx.N; |
2144 | r[1] = s->srp_ctx.g; | |
2145 | r[2] = s->srp_ctx.s; | |
2146 | r[3] = s->srp_ctx.B; | |
2147 | } else | |
2148 | #endif | |
2149 | { | |
2150 | al = SSL_AD_HANDSHAKE_FAILURE; | |
2151 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2152 | SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); | |
2153 | goto f_err; | |
2154 | } | |
0f113f3e | 2155 | |
f695571e DSH |
2156 | if (((s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) != 0) |
2157 | || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) != 0) { | |
2158 | lu = NULL; | |
2159 | } else if (lu == NULL) { | |
2160 | al = SSL_AD_DECODE_ERROR; | |
2161 | goto f_err; | |
e27f234a | 2162 | } |
0f113f3e | 2163 | |
85269210 | 2164 | #ifndef OPENSSL_NO_PSK |
e27f234a | 2165 | if (type & SSL_PSK) { |
c13d2a5b MC |
2166 | size_t len = (s->cert->psk_identity_hint == NULL) |
2167 | ? 0 : strlen(s->cert->psk_identity_hint); | |
2168 | ||
2169 | /* | |
2170 | * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already | |
2171 | * checked this when we set the identity hint - but just in case | |
2172 | */ | |
2173 | if (len > PSK_MAX_IDENTITY_LEN | |
7cea05dc | 2174 | || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint, |
c13d2a5b MC |
2175 | len)) { |
2176 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2177 | ERR_R_INTERNAL_ERROR); | |
2178 | goto f_err; | |
85269210 | 2179 | } |
e27f234a | 2180 | } |
85269210 DSH |
2181 | #endif |
2182 | ||
e27f234a | 2183 | for (i = 0; i < 4 && r[i] != NULL; i++) { |
c13d2a5b MC |
2184 | unsigned char *binval; |
2185 | int res; | |
2186 | ||
edc032b5 | 2187 | #ifndef OPENSSL_NO_SRP |
e27f234a | 2188 | if ((i == 2) && (type & SSL_kSRP)) { |
7cea05dc | 2189 | res = WPACKET_start_sub_packet_u8(pkt); |
e27f234a | 2190 | } else |
78a01b3f | 2191 | #endif |
7cea05dc | 2192 | res = WPACKET_start_sub_packet_u16(pkt); |
c13d2a5b MC |
2193 | |
2194 | if (!res) { | |
2195 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2196 | ERR_R_INTERNAL_ERROR); | |
2197 | goto f_err; | |
2198 | } | |
2199 | ||
78a01b3f | 2200 | #ifndef OPENSSL_NO_DH |
a230b26e | 2201 | /*- |
78a01b3f | 2202 | * for interoperability with some versions of the Microsoft TLS |
2203 | * stack, we need to zero pad the DHE pub key to the same length | |
2204 | * as the prime | |
2205 | */ | |
2206 | if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) { | |
c13d2a5b | 2207 | size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]); |
ff819477 | 2208 | |
c13d2a5b | 2209 | if (len > 0) { |
7cea05dc | 2210 | if (!WPACKET_allocate_bytes(pkt, len, &binval)) { |
c13d2a5b MC |
2211 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2212 | ERR_R_INTERNAL_ERROR); | |
2213 | goto f_err; | |
2214 | } | |
2215 | memset(binval, 0, len); | |
78a01b3f | 2216 | } |
c13d2a5b | 2217 | } |
edc032b5 | 2218 | #endif |
7cea05dc MC |
2219 | if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval) |
2220 | || !WPACKET_close(pkt)) { | |
c13d2a5b MC |
2221 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2222 | ERR_R_INTERNAL_ERROR); | |
2223 | goto f_err; | |
2224 | } | |
2225 | ||
2226 | BN_bn2bin(r[i], binval); | |
e27f234a | 2227 | } |
d02b48c6 | 2228 | |
10bf4fc2 | 2229 | #ifndef OPENSSL_NO_EC |
e27f234a MC |
2230 | if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2231 | /* | |
c13d2a5b MC |
2232 | * We only support named (not generic) curves. In this situation, the |
2233 | * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName] | |
2234 | * [1 byte length of encoded point], followed by the actual encoded | |
2235 | * point itself | |
e27f234a | 2236 | */ |
7cea05dc MC |
2237 | if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE) |
2238 | || !WPACKET_put_bytes_u8(pkt, 0) | |
2239 | || !WPACKET_put_bytes_u8(pkt, curve_id) | |
2240 | || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) { | |
c13d2a5b MC |
2241 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
2242 | ERR_R_INTERNAL_ERROR); | |
2243 | goto f_err; | |
2244 | } | |
e27f234a MC |
2245 | OPENSSL_free(encodedPoint); |
2246 | encodedPoint = NULL; | |
e27f234a | 2247 | } |
ea262260 BM |
2248 | #endif |
2249 | ||
e27f234a | 2250 | /* not anonymous */ |
f695571e | 2251 | if (lu != NULL) { |
a497cf25 | 2252 | EVP_PKEY *pkey = s->s3->tmp.cert->privatekey; |
f695571e DSH |
2253 | const EVP_MD *md = ssl_md(lu->hash_idx); |
2254 | unsigned char *sigbytes1, *sigbytes2; | |
2255 | size_t siglen; | |
2256 | ||
2257 | if (pkey == NULL || md == NULL) { | |
2258 | /* Should never happen */ | |
2259 | al = SSL_AD_INTERNAL_ERROR; | |
2260 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2261 | ERR_R_INTERNAL_ERROR); | |
2262 | goto f_err; | |
2263 | } | |
e27f234a MC |
2264 | /* |
2265 | * n is the length of the params, they start at &(d[4]) and p | |
2266 | * points to the space at the end. | |
2267 | */ | |
c13d2a5b | 2268 | |
f695571e DSH |
2269 | /* Get length of the parameters we have written above */ |
2270 | if (!WPACKET_get_length(pkt, ¶mlen)) { | |
2271 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2272 | ERR_R_INTERNAL_ERROR); | |
2273 | goto f_err; | |
2274 | } | |
2275 | /* send signature algorithm */ | |
2276 | if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) | |
2277 | return 0; | |
2278 | /* | |
2279 | * Create the signature. We don't know the actual length of the sig | |
2280 | * until after we've created it, so we reserve enough bytes for it | |
2281 | * up front, and then properly allocate them in the WPACKET | |
2282 | * afterwards. | |
2283 | */ | |
2284 | siglen = EVP_PKEY_size(pkey); | |
2285 | if (!WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1) | |
2286 | || EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey) <= 0) { | |
2287 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, | |
2288 | ERR_R_INTERNAL_ERROR); | |
2289 | goto f_err; | |
2290 | } | |
2291 | if (lu->sig == EVP_PKEY_RSA_PSS) { | |
2292 | if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 | |
2293 | || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) { | |
c13d2a5b | 2294 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
f695571e | 2295 | ERR_R_EVP_LIB); |
5f3d93e4 | 2296 | goto f_err; |
0f113f3e | 2297 | } |
f695571e DSH |
2298 | } |
2299 | if (EVP_DigestSignUpdate(md_ctx, &(s->s3->client_random[0]), | |
2300 | SSL3_RANDOM_SIZE) <= 0 | |
2301 | || EVP_DigestSignUpdate(md_ctx, &(s->s3->server_random[0]), | |
2302 | SSL3_RANDOM_SIZE) <= 0 | |
2303 | || EVP_DigestSignUpdate(md_ctx, | |
2304 | s->init_buf->data + paramoffset, | |
2305 | paramlen) <= 0 | |
2306 | || EVP_DigestSignFinal(md_ctx, sigbytes1, &siglen) <= 0 | |
2307 | || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2) | |
2308 | || sigbytes1 != sigbytes2) { | |
e27f234a | 2309 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, |
f695571e | 2310 | ERR_R_INTERNAL_ERROR); |
77d514c5 MC |
2311 | goto f_err; |
2312 | } | |
0f113f3e MC |
2313 | } |
2314 | ||
bfb0641f | 2315 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 2316 | return 1; |
0f113f3e MC |
2317 | f_err: |
2318 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
2319 | err: | |
e2b420fd DSH |
2320 | #ifndef OPENSSL_NO_DH |
2321 | EVP_PKEY_free(pkdh); | |
2322 | #endif | |
556efe79 | 2323 | #ifndef OPENSSL_NO_EC |
b548a1f1 | 2324 | OPENSSL_free(encodedPoint); |
ea262260 | 2325 | #endif |
bfb0641f | 2326 | EVP_MD_CTX_free(md_ctx); |
e27f234a | 2327 | return 0; |
0f113f3e | 2328 | } |
d02b48c6 | 2329 | |
7cea05dc | 2330 | int tls_construct_certificate_request(SSL *s, WPACKET *pkt) |
0f113f3e | 2331 | { |
348240c6 | 2332 | int i; |
0f113f3e | 2333 | STACK_OF(X509_NAME) *sk = NULL; |
0f113f3e | 2334 | |
e27f234a | 2335 | /* get the list of acceptable cert types */ |
7cea05dc MC |
2336 | if (!WPACKET_start_sub_packet_u8(pkt) |
2337 | || !ssl3_get_req_cert_type(s, pkt) | |
2338 | || !WPACKET_close(pkt)) { | |
28ff8ef3 MC |
2339 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
2340 | goto err; | |
2341 | } | |
0f113f3e | 2342 | |
e27f234a | 2343 | if (SSL_USE_SIGALGS(s)) { |
98c792d1 | 2344 | const uint16_t *psigs; |
a9669ddc | 2345 | size_t nl = tls12_get_psigalgs(s, 1, &psigs); |
703bcee0 | 2346 | |
7cea05dc MC |
2347 | if (!WPACKET_start_sub_packet_u16(pkt) |
2348 | || !tls12_copy_sigalgs(s, pkt, psigs, nl) | |
2349 | || !WPACKET_close(pkt)) { | |
28ff8ef3 MC |
2350 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, |
2351 | ERR_R_INTERNAL_ERROR); | |
2352 | goto err; | |
2353 | } | |
e27f234a | 2354 | } |
0f113f3e | 2355 | |
28ff8ef3 | 2356 | /* Start sub-packet for client CA list */ |
7cea05dc | 2357 | if (!WPACKET_start_sub_packet_u16(pkt)) { |
28ff8ef3 MC |
2358 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
2359 | goto err; | |
2360 | } | |
e27f234a MC |
2361 | |
2362 | sk = SSL_get_client_CA_list(s); | |
e27f234a MC |
2363 | if (sk != NULL) { |
2364 | for (i = 0; i < sk_X509_NAME_num(sk); i++) { | |
28ff8ef3 MC |
2365 | unsigned char *namebytes; |
2366 | X509_NAME *name = sk_X509_NAME_value(sk, i); | |
2367 | int namelen; | |
2368 | ||
2369 | if (name == NULL | |
2370 | || (namelen = i2d_X509_NAME(name, NULL)) < 0 | |
7cea05dc | 2371 | || !WPACKET_sub_allocate_bytes_u16(pkt, namelen, |
28ff8ef3 MC |
2372 | &namebytes) |
2373 | || i2d_X509_NAME(name, &namebytes) != namelen) { | |
2374 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, | |
2375 | ERR_R_INTERNAL_ERROR); | |
e27f234a | 2376 | goto err; |
0f113f3e MC |
2377 | } |
2378 | } | |
e27f234a MC |
2379 | } |
2380 | /* else no CA names */ | |
d02b48c6 | 2381 | |
5923ad4b | 2382 | if (!WPACKET_close(pkt)) { |
e27f234a MC |
2383 | SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); |
2384 | goto err; | |
0f113f3e | 2385 | } |
d02b48c6 | 2386 | |
e27f234a MC |
2387 | s->s3->tmp.cert_request = 1; |
2388 | ||
2389 | return 1; | |
0f113f3e | 2390 | err: |
28ff8ef3 | 2391 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
e27f234a | 2392 | return 0; |
0f113f3e | 2393 | } |
d02b48c6 | 2394 | |
0907d710 | 2395 | static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al) |
e27f234a | 2396 | { |
85269210 | 2397 | #ifndef OPENSSL_NO_PSK |
0907d710 MC |
2398 | unsigned char psk[PSK_MAX_PSK_LEN]; |
2399 | size_t psklen; | |
2400 | PACKET psk_identity; | |
efcdbcbe | 2401 | |
0907d710 MC |
2402 | if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { |
2403 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2404 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH); |
0907d710 MC |
2405 | return 0; |
2406 | } | |
2407 | if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { | |
2408 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2409 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG); |
0907d710 MC |
2410 | return 0; |
2411 | } | |
2412 | if (s->psk_server_callback == NULL) { | |
2413 | *al = SSL_AD_INTERNAL_ERROR; | |
a230b26e | 2414 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB); |
0907d710 MC |
2415 | return 0; |
2416 | } | |
85269210 | 2417 | |
0907d710 MC |
2418 | if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { |
2419 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2420 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2421 | return 0; |
2422 | } | |
85269210 | 2423 | |
0907d710 | 2424 | psklen = s->psk_server_callback(s, s->session->psk_identity, |
a230b26e | 2425 | psk, sizeof(psk)); |
85269210 | 2426 | |
0907d710 MC |
2427 | if (psklen > PSK_MAX_PSK_LEN) { |
2428 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2429 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2430 | return 0; |
2431 | } else if (psklen == 0) { | |
2432 | /* | |
2433 | * PSK related to the given identity not found | |
2434 | */ | |
2435 | *al = SSL_AD_UNKNOWN_PSK_IDENTITY; | |
c76a4aea | 2436 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, |
0907d710 MC |
2437 | SSL_R_PSK_IDENTITY_NOT_FOUND); |
2438 | return 0; | |
2439 | } | |
85269210 | 2440 | |
0907d710 MC |
2441 | OPENSSL_free(s->s3->tmp.psk); |
2442 | s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); | |
2443 | OPENSSL_cleanse(psk, psklen); | |
85269210 | 2444 | |
0907d710 MC |
2445 | if (s->s3->tmp.psk == NULL) { |
2446 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2447 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE); |
0907d710 | 2448 | return 0; |
85269210 | 2449 | } |
0907d710 MC |
2450 | |
2451 | s->s3->tmp.psklen = psklen; | |
2452 | ||
2453 | return 1; | |
2454 | #else | |
2455 | /* Should never happen */ | |
2456 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2457 | SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); |
0907d710 | 2458 | return 0; |
85269210 | 2459 | #endif |
0907d710 MC |
2460 | } |
2461 | ||
0907d710 MC |
2462 | static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al) |
2463 | { | |
bc36ee62 | 2464 | #ifndef OPENSSL_NO_RSA |
0907d710 MC |
2465 | unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; |
2466 | int decrypt_len; | |
2467 | unsigned char decrypt_good, version_good; | |
2468 | size_t j, padding_len; | |
2469 | PACKET enc_premaster; | |
2470 | RSA *rsa = NULL; | |
2471 | unsigned char *rsa_decrypt = NULL; | |
2472 | int ret = 0; | |
2473 | ||
d0ff28f8 | 2474 | rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA].privatekey); |
0907d710 MC |
2475 | if (rsa == NULL) { |
2476 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2477 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE); |
0907d710 MC |
2478 | return 0; |
2479 | } | |
2480 | ||
2481 | /* SSLv3 and pre-standard DTLS omit the length bytes. */ | |
2482 | if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { | |
2483 | enc_premaster = *pkt; | |
2484 | } else { | |
2485 | if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) | |
2486 | || PACKET_remaining(pkt) != 0) { | |
2487 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2488 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH); |
0907d710 | 2489 | return 0; |
0f113f3e | 2490 | } |
0907d710 | 2491 | } |
0f113f3e | 2492 | |
0907d710 MC |
2493 | /* |
2494 | * We want to be sure that the plaintext buffer size makes it safe to | |
2495 | * iterate over the entire size of a premaster secret | |
2496 | * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because | |
2497 | * their ciphertext cannot accommodate a premaster secret anyway. | |
2498 | */ | |
2499 | if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { | |
2500 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2501 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL); |
0907d710 MC |
2502 | return 0; |
2503 | } | |
0f113f3e | 2504 | |
0907d710 MC |
2505 | rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); |
2506 | if (rsa_decrypt == NULL) { | |
2507 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2508 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE); |
0907d710 MC |
2509 | return 0; |
2510 | } | |
0f113f3e | 2511 | |
0907d710 MC |
2512 | /* |
2513 | * We must not leak whether a decryption failure occurs because of | |
2514 | * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, | |
2515 | * section 7.4.7.1). The code follows that advice of the TLS RFC and | |
2516 | * generates a random premaster secret for the case that the decrypt | |
2517 | * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 | |
2518 | */ | |
20ca916d | 2519 | |
a230b26e | 2520 | if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0) |
0907d710 | 2521 | goto err; |
0f113f3e | 2522 | |
0907d710 MC |
2523 | /* |
2524 | * Decrypt with no padding. PKCS#1 padding will be removed as part of | |
2525 | * the timing-sensitive code below. | |
2526 | */ | |
348240c6 MC |
2527 | /* TODO(size_t): Convert this function */ |
2528 | decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster), | |
2529 | PACKET_data(&enc_premaster), | |
2530 | rsa_decrypt, rsa, RSA_NO_PADDING); | |
0907d710 MC |
2531 | if (decrypt_len < 0) |
2532 | goto err; | |
20ca916d | 2533 | |
0907d710 | 2534 | /* Check the padding. See RFC 3447, section 7.2.2. */ |
5b8fa431 | 2535 | |
0907d710 MC |
2536 | /* |
2537 | * The smallest padded premaster is 11 bytes of overhead. Small keys | |
2538 | * are publicly invalid, so this may return immediately. This ensures | |
2539 | * PS is at least 8 bytes. | |
2540 | */ | |
2541 | if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) { | |
2542 | *al = SSL_AD_DECRYPT_ERROR; | |
c76a4aea | 2543 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED); |
0907d710 MC |
2544 | goto err; |
2545 | } | |
0f113f3e | 2546 | |
0907d710 MC |
2547 | padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH; |
2548 | decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) & | |
a230b26e | 2549 | constant_time_eq_int_8(rsa_decrypt[1], 2); |
0907d710 MC |
2550 | for (j = 2; j < padding_len - 1; j++) { |
2551 | decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]); | |
2552 | } | |
2553 | decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]); | |
5b8fa431 | 2554 | |
0907d710 MC |
2555 | /* |
2556 | * If the version in the decrypted pre-master secret is correct then | |
2557 | * version_good will be 0xff, otherwise it'll be zero. The | |
2558 | * Klima-Pokorny-Rosa extension of Bleichenbacher's attack | |
2559 | * (http://eprint.iacr.org/2003/052/) exploits the version number | |
2560 | * check as a "bad version oracle". Thus version checks are done in | |
2561 | * constant time and are treated like any other decryption error. | |
2562 | */ | |
2563 | version_good = | |
2564 | constant_time_eq_8(rsa_decrypt[padding_len], | |
2565 | (unsigned)(s->client_version >> 8)); | |
2566 | version_good &= | |
2567 | constant_time_eq_8(rsa_decrypt[padding_len + 1], | |
2568 | (unsigned)(s->client_version & 0xff)); | |
0f113f3e | 2569 | |
0907d710 MC |
2570 | /* |
2571 | * The premaster secret must contain the same version number as the | |
2572 | * ClientHello to detect version rollback attacks (strangely, the | |
2573 | * protocol does not offer such protection for DH ciphersuites). | |
2574 | * However, buggy clients exist that send the negotiated protocol | |
2575 | * version instead if the server does not support the requested | |
2576 | * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such | |
2577 | * clients. | |
2578 | */ | |
2579 | if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { | |
2580 | unsigned char workaround_good; | |
2581 | workaround_good = constant_time_eq_8(rsa_decrypt[padding_len], | |
2582 | (unsigned)(s->version >> 8)); | |
2583 | workaround_good &= | |
5b8fa431 | 2584 | constant_time_eq_8(rsa_decrypt[padding_len + 1], |
0907d710 MC |
2585 | (unsigned)(s->version & 0xff)); |
2586 | version_good |= workaround_good; | |
2587 | } | |
0f113f3e | 2588 | |
0907d710 MC |
2589 | /* |
2590 | * Both decryption and version must be good for decrypt_good to | |
2591 | * remain non-zero (0xff). | |
2592 | */ | |
2593 | decrypt_good &= version_good; | |
0f113f3e | 2594 | |
0907d710 MC |
2595 | /* |
2596 | * Now copy rand_premaster_secret over from p using | |
2597 | * decrypt_good_mask. If decryption failed, then p does not | |
2598 | * contain valid plaintext, however, a check above guarantees | |
2599 | * it is still sufficiently large to read from. | |
2600 | */ | |
2601 | for (j = 0; j < sizeof(rand_premaster_secret); j++) { | |
2602 | rsa_decrypt[padding_len + j] = | |
2603 | constant_time_select_8(decrypt_good, | |
2604 | rsa_decrypt[padding_len + j], | |
2605 | rand_premaster_secret[j]); | |
2606 | } | |
0f113f3e | 2607 | |
0907d710 MC |
2608 | if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len, |
2609 | sizeof(rand_premaster_secret), 0)) { | |
2610 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2611 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2612 | goto err; |
2613 | } | |
0f113f3e | 2614 | |
0907d710 MC |
2615 | ret = 1; |
2616 | err: | |
2617 | OPENSSL_free(rsa_decrypt); | |
2618 | return ret; | |
2619 | #else | |
2620 | /* Should never happen */ | |
2621 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2622 | SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR); |
0907d710 MC |
2623 | return 0; |
2624 | #endif | |
2625 | } | |
2626 | ||
642360f9 MC |
2627 | static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al) |
2628 | { | |
2629 | #ifndef OPENSSL_NO_DH | |
2630 | EVP_PKEY *skey = NULL; | |
2631 | DH *cdh; | |
2632 | unsigned int i; | |
2633 | BIGNUM *pub_key; | |
2634 | const unsigned char *data; | |
2635 | EVP_PKEY *ckey = NULL; | |
2636 | int ret = 0; | |
2637 | ||
31a7d80d | 2638 | if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) { |
642360f9 | 2639 | *al = SSL_AD_HANDSHAKE_FAILURE; |
c76a4aea | 2640 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, |
642360f9 MC |
2641 | SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); |
2642 | goto err; | |
2643 | } | |
642360f9 MC |
2644 | skey = s->s3->tmp.pkey; |
2645 | if (skey == NULL) { | |
2646 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2647 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY); |
642360f9 MC |
2648 | goto err; |
2649 | } | |
2650 | ||
2651 | if (PACKET_remaining(pkt) == 0L) { | |
2652 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2653 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY); |
642360f9 MC |
2654 | goto err; |
2655 | } | |
2656 | if (!PACKET_get_bytes(pkt, &data, i)) { | |
2657 | /* We already checked we have enough data */ | |
2658 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2659 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2660 | goto err; |
2661 | } | |
2662 | ckey = EVP_PKEY_new(); | |
2663 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { | |
c76a4aea | 2664 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB); |
642360f9 MC |
2665 | goto err; |
2666 | } | |
2667 | cdh = EVP_PKEY_get0_DH(ckey); | |
2668 | pub_key = BN_bin2bn(data, i, NULL); | |
2669 | ||
2670 | if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) { | |
c76a4aea | 2671 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2672 | if (pub_key != NULL) |
2673 | BN_free(pub_key); | |
2674 | goto err; | |
2675 | } | |
2676 | ||
0f1e51ea | 2677 | if (ssl_derive(s, skey, ckey, 1) == 0) { |
642360f9 | 2678 | *al = SSL_AD_INTERNAL_ERROR; |
c76a4aea | 2679 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2680 | goto err; |
2681 | } | |
2682 | ||
2683 | ret = 1; | |
2684 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2685 | s->s3->tmp.pkey = NULL; | |
2686 | err: | |
2687 | EVP_PKEY_free(ckey); | |
2688 | return ret; | |
2689 | #else | |
2690 | /* Should never happen */ | |
2691 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2692 | SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR); |
642360f9 MC |
2693 | return 0; |
2694 | #endif | |
2695 | } | |
2696 | ||
19ed1ec1 MC |
2697 | static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al) |
2698 | { | |
2699 | #ifndef OPENSSL_NO_EC | |
2700 | EVP_PKEY *skey = s->s3->tmp.pkey; | |
2701 | EVP_PKEY *ckey = NULL; | |
2702 | int ret = 0; | |
2703 | ||
2704 | if (PACKET_remaining(pkt) == 0L) { | |
2705 | /* We don't support ECDH client auth */ | |
2706 | *al = SSL_AD_HANDSHAKE_FAILURE; | |
c76a4aea | 2707 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY); |
19ed1ec1 MC |
2708 | goto err; |
2709 | } else { | |
2710 | unsigned int i; | |
2711 | const unsigned char *data; | |
2712 | ||
2713 | /* | |
2714 | * Get client's public key from encoded point in the | |
2715 | * ClientKeyExchange message. | |
2716 | */ | |
2717 | ||
2718 | /* Get encoded point length */ | |
fb933982 DSH |
2719 | if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i) |
2720 | || PACKET_remaining(pkt) != 0) { | |
19ed1ec1 | 2721 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2722 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH); |
19ed1ec1 MC |
2723 | goto err; |
2724 | } | |
19ed1ec1 MC |
2725 | ckey = EVP_PKEY_new(); |
2726 | if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { | |
c76a4aea | 2727 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB); |
19ed1ec1 MC |
2728 | goto err; |
2729 | } | |
ec24630a | 2730 | if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) { |
fb933982 | 2731 | *al = SSL_AD_HANDSHAKE_FAILURE; |
c76a4aea | 2732 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB); |
19ed1ec1 MC |
2733 | goto err; |
2734 | } | |
2735 | } | |
2736 | ||
0f1e51ea | 2737 | if (ssl_derive(s, skey, ckey, 1) == 0) { |
19ed1ec1 | 2738 | *al = SSL_AD_INTERNAL_ERROR; |
c76a4aea | 2739 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR); |
19ed1ec1 MC |
2740 | goto err; |
2741 | } | |
2742 | ||
2743 | ret = 1; | |
2744 | EVP_PKEY_free(s->s3->tmp.pkey); | |
2745 | s->s3->tmp.pkey = NULL; | |
2746 | err: | |
2747 | EVP_PKEY_free(ckey); | |
2748 | ||
2749 | return ret; | |
2750 | #else | |
2751 | /* Should never happen */ | |
2752 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2753 | SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR); |
19ed1ec1 MC |
2754 | return 0; |
2755 | #endif | |
2756 | } | |
2757 | ||
c437eef6 MC |
2758 | static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al) |
2759 | { | |
2760 | #ifndef OPENSSL_NO_SRP | |
2761 | unsigned int i; | |
2762 | const unsigned char *data; | |
2763 | ||
2764 | if (!PACKET_get_net_2(pkt, &i) | |
a230b26e | 2765 | || !PACKET_get_bytes(pkt, &data, i)) { |
c437eef6 | 2766 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2767 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH); |
c437eef6 MC |
2768 | return 0; |
2769 | } | |
2770 | if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { | |
c76a4aea | 2771 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB); |
c437eef6 MC |
2772 | return 0; |
2773 | } | |
a230b26e | 2774 | if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) { |
c437eef6 | 2775 | *al = SSL_AD_ILLEGAL_PARAMETER; |
c76a4aea | 2776 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS); |
c437eef6 MC |
2777 | return 0; |
2778 | } | |
2779 | OPENSSL_free(s->session->srp_username); | |
2780 | s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); | |
2781 | if (s->session->srp_username == NULL) { | |
c76a4aea | 2782 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE); |
c437eef6 MC |
2783 | return 0; |
2784 | } | |
2785 | ||
2786 | if (!srp_generate_server_master_secret(s)) { | |
c76a4aea | 2787 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2788 | return 0; |
2789 | } | |
2790 | ||
2791 | return 1; | |
2792 | #else | |
2793 | /* Should never happen */ | |
2794 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2795 | SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2796 | return 0; |
2797 | #endif | |
2798 | } | |
2799 | ||
2800 | static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al) | |
2801 | { | |
2802 | #ifndef OPENSSL_NO_GOST | |
2803 | EVP_PKEY_CTX *pkey_ctx; | |
2804 | EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; | |
2805 | unsigned char premaster_secret[32]; | |
2806 | const unsigned char *start; | |
2807 | size_t outlen = 32, inlen; | |
2808 | unsigned long alg_a; | |
2809 | int Ttag, Tclass; | |
2810 | long Tlen; | |
348240c6 | 2811 | size_t sess_key_len; |
c437eef6 MC |
2812 | const unsigned char *data; |
2813 | int ret = 0; | |
2814 | ||
2815 | /* Get our certificate private key */ | |
2816 | alg_a = s->s3->tmp.new_cipher->algorithm_auth; | |
2817 | if (alg_a & SSL_aGOST12) { | |
2818 | /* | |
2819 | * New GOST ciphersuites have SSL_aGOST01 bit too | |
2820 | */ | |
2821 | pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; | |
2822 | if (pk == NULL) { | |
2823 | pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; | |
2824 | } | |
2825 | if (pk == NULL) { | |
2826 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2827 | } | |
2828 | } else if (alg_a & SSL_aGOST01) { | |
2829 | pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; | |
2830 | } | |
2831 | ||
2832 | pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); | |
2833 | if (pkey_ctx == NULL) { | |
2834 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2835 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE); |
c437eef6 MC |
2836 | return 0; |
2837 | } | |
2838 | if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { | |
2839 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2840 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2841 | return 0; |
2842 | } | |
2843 | /* | |
2844 | * If client certificate is present and is of the same type, maybe | |
2845 | * use it for key exchange. Don't mind errors from | |
2846 | * EVP_PKEY_derive_set_peer, because it is completely valid to use a | |
2847 | * client certificate for authorization only. | |
2848 | */ | |
2849 | client_pub_pkey = X509_get0_pubkey(s->session->peer); | |
2850 | if (client_pub_pkey) { | |
2851 | if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) | |
2852 | ERR_clear_error(); | |
2853 | } | |
2854 | /* Decrypt session key */ | |
2855 | sess_key_len = PACKET_remaining(pkt); | |
2856 | if (!PACKET_get_bytes(pkt, &data, sess_key_len)) { | |
2857 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2858 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2859 | goto err; |
2860 | } | |
348240c6 | 2861 | /* TODO(size_t): Convert this function */ |
a230b26e | 2862 | if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag, |
348240c6 | 2863 | &Tclass, (long)sess_key_len) != V_ASN1_CONSTRUCTED |
a230b26e | 2864 | || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) { |
c437eef6 | 2865 | *al = SSL_AD_DECODE_ERROR; |
c76a4aea | 2866 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED); |
c437eef6 MC |
2867 | goto err; |
2868 | } | |
2869 | start = data; | |
2870 | inlen = Tlen; | |
2871 | if (EVP_PKEY_decrypt | |
2872 | (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) { | |
2873 | *al = SSL_AD_DECODE_ERROR; | |
c76a4aea | 2874 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED); |
c437eef6 MC |
2875 | goto err; |
2876 | } | |
2877 | /* Generate master secret */ | |
2878 | if (!ssl_generate_master_secret(s, premaster_secret, | |
2879 | sizeof(premaster_secret), 0)) { | |
2880 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2881 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2882 | goto err; |
2883 | } | |
2884 | /* Check if pubkey from client certificate was used */ | |
2885 | if (EVP_PKEY_CTX_ctrl | |
2886 | (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) | |
2887 | s->statem.no_cert_verify = 1; | |
2888 | ||
2889 | ret = 1; | |
2890 | err: | |
2891 | EVP_PKEY_CTX_free(pkey_ctx); | |
2892 | return ret; | |
2893 | #else | |
2894 | /* Should never happen */ | |
2895 | *al = SSL_AD_INTERNAL_ERROR; | |
c76a4aea | 2896 | SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR); |
c437eef6 MC |
2897 | return 0; |
2898 | #endif | |
2899 | } | |
2900 | ||
0907d710 MC |
2901 | MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) |
2902 | { | |
2903 | int al = -1; | |
2904 | unsigned long alg_k; | |
2905 | ||
2906 | alg_k = s->s3->tmp.new_cipher->algorithm_mkey; | |
2907 | ||
2908 | /* For PSK parse and retrieve identity, obtain PSK key */ | |
2909 | if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al)) | |
2910 | goto err; | |
2911 | ||
2912 | if (alg_k & SSL_kPSK) { | |
2913 | /* Identity extracted earlier: should be nothing left */ | |
2914 | if (PACKET_remaining(pkt) != 0) { | |
2915 | al = SSL_AD_HANDSHAKE_FAILURE; | |
a230b26e EK |
2916 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2917 | SSL_R_LENGTH_MISMATCH); | |
9059eb71 | 2918 | goto err; |
0907d710 MC |
2919 | } |
2920 | /* PSK handled by ssl_generate_master_secret */ | |
2921 | if (!ssl_generate_master_secret(s, NULL, 0, 0)) { | |
69f68237 | 2922 | al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 2923 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); |
9059eb71 | 2924 | goto err; |
69f68237 | 2925 | } |
0907d710 MC |
2926 | } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { |
2927 | if (!tls_process_cke_rsa(s, pkt, &al)) | |
2928 | goto err; | |
642360f9 MC |
2929 | } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { |
2930 | if (!tls_process_cke_dhe(s, pkt, &al)) | |
0f113f3e | 2931 | goto err; |
19ed1ec1 MC |
2932 | } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { |
2933 | if (!tls_process_cke_ecdhe(s, pkt, &al)) | |
2934 | goto err; | |
c437eef6 MC |
2935 | } else if (alg_k & SSL_kSRP) { |
2936 | if (!tls_process_cke_srp(s, pkt, &al)) | |
0f113f3e | 2937 | goto err; |
c437eef6 MC |
2938 | } else if (alg_k & SSL_kGOST) { |
2939 | if (!tls_process_cke_gost(s, pkt, &al)) | |
0f113f3e | 2940 | goto err; |
c437eef6 | 2941 | } else { |
0f113f3e | 2942 | al = SSL_AD_HANDSHAKE_FAILURE; |
a230b26e EK |
2943 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, |
2944 | SSL_R_UNKNOWN_CIPHER_TYPE); | |
9059eb71 | 2945 | goto err; |
0f113f3e MC |
2946 | } |
2947 | ||
e27f234a | 2948 | return MSG_PROCESS_CONTINUE_PROCESSING; |
0f113f3e | 2949 | err: |
0907d710 MC |
2950 | if (al != -1) |
2951 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
85269210 DSH |
2952 | #ifndef OPENSSL_NO_PSK |
2953 | OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); | |
2954 | s->s3->tmp.psk = NULL; | |
58964a49 | 2955 | #endif |
fe3a3291 | 2956 | ossl_statem_set_error(s); |
e27f234a | 2957 | return MSG_PROCESS_ERROR; |
0f113f3e | 2958 | } |
d02b48c6 | 2959 | |
be3583fa | 2960 | WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) |
94836de2 | 2961 | { |
94836de2 | 2962 | #ifndef OPENSSL_NO_SCTP |
c130dd8e MC |
2963 | if (wst == WORK_MORE_A) { |
2964 | if (SSL_IS_DTLS(s)) { | |
2965 | unsigned char sctpauthkey[64]; | |
2966 | char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; | |
2967 | /* | |
2968 | * Add new shared key for SCTP-Auth, will be ignored if no SCTP | |
2969 | * used. | |
2970 | */ | |
141eb8c6 MC |
2971 | memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, |
2972 | sizeof(DTLS1_SCTP_AUTH_LABEL)); | |
c130dd8e MC |
2973 | |
2974 | if (SSL_export_keying_material(s, sctpauthkey, | |
a230b26e EK |
2975 | sizeof(sctpauthkey), labelbuffer, |
2976 | sizeof(labelbuffer), NULL, 0, | |
2977 | 0) <= 0) { | |
fe3a3291 | 2978 | ossl_statem_set_error(s); |
0fe2a0af | 2979 | return WORK_ERROR; |
c130dd8e | 2980 | } |
94836de2 | 2981 | |
c130dd8e MC |
2982 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, |
2983 | sizeof(sctpauthkey), sctpauthkey); | |
94836de2 | 2984 | } |
c130dd8e MC |
2985 | wst = WORK_MORE_B; |
2986 | } | |
94836de2 | 2987 | |
c130dd8e | 2988 | if ((wst == WORK_MORE_B) |
a230b26e EK |
2989 | /* Is this SCTP? */ |
2990 | && BIO_dgram_is_sctp(SSL_get_wbio(s)) | |
2991 | /* Are we renegotiating? */ | |
2992 | && s->renegotiate | |
2993 | /* Are we going to skip the CertificateVerify? */ | |
2994 | && (s->session->peer == NULL || s->statem.no_cert_verify) | |
2995 | && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { | |
c130dd8e MC |
2996 | s->s3->in_read_app_data = 2; |
2997 | s->rwstate = SSL_READING; | |
2998 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
2999 | BIO_set_retry_read(SSL_get_rbio(s)); | |
d99b0691 | 3000 | ossl_statem_set_sctp_read_sock(s, 1); |
c130dd8e MC |
3001 | return WORK_MORE_B; |
3002 | } else { | |
fe3a3291 | 3003 | ossl_statem_set_sctp_read_sock(s, 0); |
94836de2 MC |
3004 | } |
3005 | #endif | |
3006 | ||
149c2ef5 | 3007 | if (s->statem.no_cert_verify || !s->session->peer) { |
a230b26e EK |
3008 | /* |
3009 | * No certificate verify or no peer certificate so we no longer need | |
3010 | * the handshake_buffer | |
149c2ef5 MC |
3011 | */ |
3012 | if (!ssl3_digest_cached_records(s, 0)) { | |
3013 | ossl_statem_set_error(s); | |
3014 | return WORK_ERROR; | |
3015 | } | |
94836de2 | 3016 | return WORK_FINISHED_CONTINUE; |
28f4580c | 3017 | } else { |
94836de2 MC |
3018 | if (!s->s3->handshake_buffer) { |
3019 | SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, | |
3020 | ERR_R_INTERNAL_ERROR); | |
fe3a3291 | 3021 | ossl_statem_set_error(s); |
94836de2 MC |
3022 | return WORK_ERROR; |
3023 | } | |
3024 | /* | |
3025 | * For sigalgs freeze the handshake buffer. If we support | |
3026 | * extms we've done this already so this is a no-op | |
3027 | */ | |
3028 | if (!ssl3_digest_cached_records(s, 1)) { | |
fe3a3291 | 3029 | ossl_statem_set_error(s); |
94836de2 MC |
3030 | return WORK_ERROR; |
3031 | } | |
94836de2 MC |
3032 | } |
3033 | ||
3034 | return WORK_FINISHED_CONTINUE; | |
3035 | } | |
3036 | ||
be3583fa | 3037 | MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) |
e27f234a | 3038 | { |
20dbe585 | 3039 | int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR; |
e27f234a MC |
3040 | X509 *x = NULL; |
3041 | unsigned long l, llen; | |
b6981744 | 3042 | const unsigned char *certstart, *certbytes; |
e27f234a | 3043 | STACK_OF(X509) *sk = NULL; |
e96e0f8e | 3044 | PACKET spkt, context; |
d805a57b | 3045 | size_t chainidx; |
0f113f3e MC |
3046 | |
3047 | if ((sk = sk_X509_new_null()) == NULL) { | |
e27f234a MC |
3048 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3049 | goto f_err; | |
0f113f3e MC |
3050 | } |
3051 | ||
e96e0f8e MC |
3052 | /* TODO(TLS1.3): For now we ignore the context. We need to verify this */ |
3053 | if ((SSL_IS_TLS13(s) && !PACKET_get_length_prefixed_1(pkt, &context)) | |
3054 | || !PACKET_get_net_3(pkt, &llen) | |
3055 | || !PACKET_get_sub_packet(pkt, &spkt, llen) | |
3056 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e | 3057 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3058 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH); |
0f113f3e MC |
3059 | goto f_err; |
3060 | } | |
0bc09ecd | 3061 | |
d805a57b | 3062 | for (chainidx = 0; PACKET_remaining(&spkt) > 0; chainidx++) { |
0bc09ecd | 3063 | if (!PACKET_get_net_3(&spkt, &l) |
a230b26e | 3064 | || !PACKET_get_bytes(&spkt, &certbytes, l)) { |
0f113f3e | 3065 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3066 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3067 | SSL_R_CERT_LENGTH_MISMATCH); |
3068 | goto f_err; | |
3069 | } | |
3070 | ||
0bc09ecd MC |
3071 | certstart = certbytes; |
3072 | x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); | |
0f113f3e | 3073 | if (x == NULL) { |
e27f234a MC |
3074 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); |
3075 | goto f_err; | |
0f113f3e | 3076 | } |
0bc09ecd | 3077 | if (certbytes != (certstart + l)) { |
0f113f3e | 3078 | al = SSL_AD_DECODE_ERROR; |
e27f234a | 3079 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3080 | SSL_R_CERT_LENGTH_MISMATCH); |
3081 | goto f_err; | |
3082 | } | |
e96e0f8e MC |
3083 | |
3084 | if (SSL_IS_TLS13(s)) { | |
3085 | RAW_EXTENSION *rawexts = NULL; | |
3086 | PACKET extensions; | |
3087 | ||
3088 | if (!PACKET_get_length_prefixed_2(&spkt, &extensions)) { | |
3089 | al = SSL_AD_DECODE_ERROR; | |
3090 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_BAD_LENGTH); | |
3091 | goto f_err; | |
3092 | } | |
3093 | if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_CERTIFICATE, | |
3094 | &rawexts, &al) | |
3095 | || !tls_parse_all_extensions(s, EXT_TLS1_3_CERTIFICATE, | |
5ee289ea MC |
3096 | rawexts, x, chainidx, &al)) { |
3097 | OPENSSL_free(rawexts); | |
e96e0f8e | 3098 | goto f_err; |
5ee289ea MC |
3099 | } |
3100 | OPENSSL_free(rawexts); | |
e96e0f8e MC |
3101 | } |
3102 | ||
0f113f3e | 3103 | if (!sk_X509_push(sk, x)) { |
e27f234a MC |
3104 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); |
3105 | goto f_err; | |
0f113f3e MC |
3106 | } |
3107 | x = NULL; | |
0f113f3e MC |
3108 | } |
3109 | ||
3110 | if (sk_X509_num(sk) <= 0) { | |
3111 | /* TLS does not mind 0 certs returned */ | |
3112 | if (s->version == SSL3_VERSION) { | |
3113 | al = SSL_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3114 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3115 | SSL_R_NO_CERTIFICATES_RETURNED); |
3116 | goto f_err; | |
3117 | } | |
3118 | /* Fail for TLS only if we required a certificate */ | |
3119 | else if ((s->verify_mode & SSL_VERIFY_PEER) && | |
3120 | (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { | |
e27f234a | 3121 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3122 | SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
3123 | al = SSL_AD_HANDSHAKE_FAILURE; | |
3124 | goto f_err; | |
3125 | } | |
3126 | /* No client certificate so digest cached records */ | |
124037fd | 3127 | if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { |
0f113f3e MC |
3128 | goto f_err; |
3129 | } | |
3130 | } else { | |
3131 | EVP_PKEY *pkey; | |
3132 | i = ssl_verify_cert_chain(s, sk); | |
3133 | if (i <= 0) { | |
3134 | al = ssl_verify_alarm_type(s->verify_result); | |
e27f234a | 3135 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3136 | SSL_R_CERTIFICATE_VERIFY_FAILED); |
3137 | goto f_err; | |
3138 | } | |
3139 | if (i > 1) { | |
e27f234a | 3140 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); |
0f113f3e MC |
3141 | al = SSL_AD_HANDSHAKE_FAILURE; |
3142 | goto f_err; | |
3143 | } | |
8382fd3a | 3144 | pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); |
0f113f3e MC |
3145 | if (pkey == NULL) { |
3146 | al = SSL3_AD_HANDSHAKE_FAILURE; | |
e27f234a | 3147 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, |
0f113f3e MC |
3148 | SSL_R_UNKNOWN_CERTIFICATE_TYPE); |
3149 | goto f_err; | |
3150 | } | |
0f113f3e MC |
3151 | } |
3152 | ||
222561fe | 3153 | X509_free(s->session->peer); |
0f113f3e MC |
3154 | s->session->peer = sk_X509_shift(sk); |
3155 | s->session->verify_result = s->verify_result; | |
3156 | ||
c34b0f99 DSH |
3157 | sk_X509_pop_free(s->session->peer_chain, X509_free); |
3158 | s->session->peer_chain = sk; | |
0f1e51ea MC |
3159 | |
3160 | /* | |
3161 | * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE | |
3162 | * message | |
3163 | */ | |
94ed2c67 | 3164 | if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) { |
0f1e51ea MC |
3165 | al = SSL_AD_INTERNAL_ERROR; |
3166 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
3167 | goto f_err; | |
3168 | } | |
3169 | ||
0f113f3e MC |
3170 | /* |
3171 | * Inconsistency alert: cert_chain does *not* include the peer's own | |
d4d78943 | 3172 | * certificate, while we do include it in statem_clnt.c |
0f113f3e | 3173 | */ |
0f113f3e | 3174 | sk = NULL; |
2c5dfdc3 MC |
3175 | |
3176 | /* Save the current hash state for when we receive the CertificateVerify */ | |
3177 | if (SSL_IS_TLS13(s) | |
3178 | && !ssl_handshake_hash(s, s->cert_verify_hash, | |
3179 | sizeof(s->cert_verify_hash), | |
3180 | &s->cert_verify_hash_len)) { | |
3181 | al = SSL_AD_INTERNAL_ERROR; | |
3182 | SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); | |
3183 | goto f_err; | |
3184 | } | |
3185 | ||
e27f234a | 3186 | ret = MSG_PROCESS_CONTINUE_READING; |
66696478 RS |
3187 | goto done; |
3188 | ||
0f113f3e | 3189 | f_err: |
66696478 | 3190 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
fe3a3291 | 3191 | ossl_statem_set_error(s); |
66696478 | 3192 | done: |
222561fe RS |
3193 | X509_free(x); |
3194 | sk_X509_pop_free(sk, X509_free); | |
e27f234a | 3195 | return ret; |
0f113f3e | 3196 | } |
d02b48c6 | 3197 | |
7cea05dc | 3198 | int tls_construct_server_certificate(SSL *s, WPACKET *pkt) |
e27f234a | 3199 | { |
a497cf25 | 3200 | CERT_PKEY *cpk = s->s3->tmp.cert; |
e96e0f8e | 3201 | int al = SSL_AD_INTERNAL_ERROR; |
e27f234a | 3202 | |
a497cf25 | 3203 | if (cpk == NULL) { |
e27f234a | 3204 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); |
e27f234a MC |
3205 | return 0; |
3206 | } | |
3207 | ||
e96e0f8e MC |
3208 | /* |
3209 | * In TLSv1.3 the certificate chain is always preceded by a 0 length context | |
3210 | * for the server Certificate message | |
3211 | */ | |
3212 | if ((SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0)) | |
3213 | || !ssl3_output_cert_chain(s, pkt, cpk, &al)) { | |
e27f234a | 3214 | SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); |
e96e0f8e | 3215 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
e27f234a MC |
3216 | return 0; |
3217 | } | |
3218 | ||
3219 | return 1; | |
3220 | } | |
3221 | ||
7cea05dc | 3222 | int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt) |
e27f234a MC |
3223 | { |
3224 | unsigned char *senc = NULL; | |
83ae4661 | 3225 | EVP_CIPHER_CTX *ctx = NULL; |
bf7c6817 | 3226 | HMAC_CTX *hctx = NULL; |
a00d75e1 | 3227 | unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2; |
e27f234a | 3228 | const unsigned char *const_p; |
a00d75e1 | 3229 | int len, slen_full, slen, lenfinal; |
e27f234a MC |
3230 | SSL_SESSION *sess; |
3231 | unsigned int hlen; | |
222da979 | 3232 | SSL_CTX *tctx = s->session_ctx; |
e27f234a | 3233 | unsigned char iv[EVP_MAX_IV_LENGTH]; |
d139723b | 3234 | unsigned char key_name[TLSEXT_KEYNAME_LENGTH]; |
30f05b19 | 3235 | int iv_len, al = SSL_AD_INTERNAL_ERROR; |
a00d75e1 | 3236 | size_t macoffset, macendoffset; |
30f05b19 MC |
3237 | union { |
3238 | unsigned char age_add_c[sizeof(uint32_t)]; | |
3239 | uint32_t age_add; | |
3240 | } age_add_u; | |
e27f234a | 3241 | |
fc24f0bf MC |
3242 | if (SSL_IS_TLS13(s)) { |
3243 | if (RAND_bytes(age_add_u.age_add_c, sizeof(age_add_u)) <= 0) | |
3244 | goto err; | |
3245 | s->session->ext.tick_age_add = age_add_u.age_add; | |
3246 | } | |
3247 | ||
e27f234a MC |
3248 | /* get session encoding length */ |
3249 | slen_full = i2d_SSL_SESSION(s->session, NULL); | |
3250 | /* | |
3251 | * Some length values are 16 bits, so forget it if session is too | |
3252 | * long | |
3253 | */ | |
3254 | if (slen_full == 0 || slen_full > 0xFF00) { | |
fe3a3291 | 3255 | ossl_statem_set_error(s); |
e27f234a MC |
3256 | return 0; |
3257 | } | |
3258 | senc = OPENSSL_malloc(slen_full); | |
a71edf3b | 3259 | if (senc == NULL) { |
fe3a3291 | 3260 | ossl_statem_set_error(s); |
e27f234a MC |
3261 | return 0; |
3262 | } | |
0f113f3e | 3263 | |
846ec07d | 3264 | ctx = EVP_CIPHER_CTX_new(); |
bf7c6817 | 3265 | hctx = HMAC_CTX_new(); |
83ae4661 MC |
3266 | if (ctx == NULL || hctx == NULL) { |
3267 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); | |
3268 | goto err; | |
3269 | } | |
0f113f3e | 3270 | |
e27f234a MC |
3271 | p = senc; |
3272 | if (!i2d_SSL_SESSION(s->session, &p)) | |
3273 | goto err; | |
687eaf27 | 3274 | |
e27f234a MC |
3275 | /* |
3276 | * create a fresh copy (not shared with other threads) to clean up | |
3277 | */ | |
3278 | const_p = senc; | |
3279 | sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); | |
3280 | if (sess == NULL) | |
3281 | goto err; | |
3282 | sess->session_id_length = 0; /* ID is irrelevant for the ticket */ | |
0f113f3e | 3283 | |
e27f234a MC |
3284 | slen = i2d_SSL_SESSION(sess, NULL); |
3285 | if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ | |
3286 | SSL_SESSION_free(sess); | |
3287 | goto err; | |
3288 | } | |
3289 | p = senc; | |
3290 | if (!i2d_SSL_SESSION(sess, &p)) { | |
3291 | SSL_SESSION_free(sess); | |
3292 | goto err; | |
3293 | } | |
3294 | SSL_SESSION_free(sess); | |
0f113f3e | 3295 | |
e27f234a MC |
3296 | /* |
3297 | * Initialize HMAC and cipher contexts. If callback present it does | |
3298 | * all the work otherwise use generated values from parent ctx. | |
3299 | */ | |
aff8c126 | 3300 | if (tctx->ext.ticket_key_cb) { |
5c753de6 | 3301 | /* if 0 is returned, write an empty ticket */ |
aff8c126 | 3302 | int ret = tctx->ext.ticket_key_cb(s, key_name, iv, ctx, |
5c753de6 TS |
3303 | hctx, 1); |
3304 | ||
3305 | if (ret == 0) { | |
a00d75e1 MC |
3306 | |
3307 | /* Put timeout and length */ | |
7cea05dc | 3308 | if (!WPACKET_put_bytes_u32(pkt, 0) |
4a01c59f | 3309 | || !WPACKET_put_bytes_u16(pkt, 0)) { |
a00d75e1 MC |
3310 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, |
3311 | ERR_R_INTERNAL_ERROR); | |
5c753de6 | 3312 | goto err; |
a00d75e1 | 3313 | } |
5c753de6 TS |
3314 | OPENSSL_free(senc); |
3315 | EVP_CIPHER_CTX_free(ctx); | |
3316 | HMAC_CTX_free(hctx); | |
3317 | return 1; | |
3318 | } | |
3319 | if (ret < 0) | |
e27f234a | 3320 | goto err; |
d139723b | 3321 | iv_len = EVP_CIPHER_CTX_iv_length(ctx); |
e27f234a | 3322 | } else { |
d139723b KR |
3323 | const EVP_CIPHER *cipher = EVP_aes_256_cbc(); |
3324 | ||
3325 | iv_len = EVP_CIPHER_iv_length(cipher); | |
3326 | if (RAND_bytes(iv, iv_len) <= 0) | |
687eaf27 | 3327 | goto err; |
d139723b | 3328 | if (!EVP_EncryptInit_ex(ctx, cipher, NULL, |
aff8c126 | 3329 | tctx->ext.tick_aes_key, iv)) |
687eaf27 | 3330 | goto err; |
aff8c126 RS |
3331 | if (!HMAC_Init_ex(hctx, tctx->ext.tick_hmac_key, |
3332 | sizeof(tctx->ext.tick_hmac_key), | |
e27f234a | 3333 | EVP_sha256(), NULL)) |
4f9fab6b | 3334 | goto err; |
aff8c126 RS |
3335 | memcpy(key_name, tctx->ext.tick_key_name, |
3336 | sizeof(tctx->ext.tick_key_name)); | |
0f113f3e MC |
3337 | } |
3338 | ||
e27f234a MC |
3339 | /* |
3340 | * Ticket lifetime hint (advisory only): We leave this unspecified | |
3341 | * for resumed session (for simplicity), and guess that tickets for | |
3342 | * new sessions will live as long as their sessions. | |
3343 | */ | |
7cea05dc | 3344 | if (!WPACKET_put_bytes_u32(pkt, s->hit ? 0 : s->session->timeout) |
30f05b19 MC |
3345 | || (SSL_IS_TLS13(s) |
3346 | && !WPACKET_put_bytes_u32(pkt, age_add_u.age_add)) | |
a00d75e1 | 3347 | /* Now the actual ticket data */ |
7cea05dc MC |
3348 | || !WPACKET_start_sub_packet_u16(pkt) |
3349 | || !WPACKET_get_total_written(pkt, &macoffset) | |
a00d75e1 | 3350 | /* Output key name */ |
7cea05dc | 3351 | || !WPACKET_memcpy(pkt, key_name, sizeof(key_name)) |
a00d75e1 | 3352 | /* output IV */ |
7cea05dc MC |
3353 | || !WPACKET_memcpy(pkt, iv, iv_len) |
3354 | || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH, | |
a00d75e1 MC |
3355 | &encdata1) |
3356 | /* Encrypt session data */ | |
3357 | || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen) | |
7cea05dc | 3358 | || !WPACKET_allocate_bytes(pkt, len, &encdata2) |
a00d75e1 MC |
3359 | || encdata1 != encdata2 |
3360 | || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal) | |
7cea05dc | 3361 | || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2) |
a00d75e1 MC |
3362 | || encdata1 + len != encdata2 |
3363 | || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH | |
7cea05dc | 3364 | || !WPACKET_get_total_written(pkt, &macendoffset) |
a00d75e1 MC |
3365 | || !HMAC_Update(hctx, |
3366 | (unsigned char *)s->init_buf->data + macoffset, | |
3367 | macendoffset - macoffset) | |
7cea05dc | 3368 | || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1) |
a00d75e1 MC |
3369 | || !HMAC_Final(hctx, macdata1, &hlen) |
3370 | || hlen > EVP_MAX_MD_SIZE | |
7cea05dc | 3371 | || !WPACKET_allocate_bytes(pkt, hlen, &macdata2) |
a00d75e1 | 3372 | || macdata1 != macdata2 |
30f05b19 MC |
3373 | || !WPACKET_close(pkt) |
3374 | || (SSL_IS_TLS13(s) | |
3375 | && !tls_construct_extensions(s, pkt, | |
3376 | EXT_TLS1_3_NEW_SESSION_TICKET, | |
3377 | NULL, 0, &al))) { | |
a00d75e1 | 3378 | SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_INTERNAL_ERROR); |
e27f234a | 3379 | goto err; |
a00d75e1 | 3380 | } |
bcaad809 DSH |
3381 | EVP_CIPHER_CTX_free(ctx); |
3382 | HMAC_CTX_free(hctx); | |
e27f234a MC |
3383 | OPENSSL_free(senc); |
3384 | ||
3385 | return 1; | |
687eaf27 | 3386 | err: |
b548a1f1 | 3387 | OPENSSL_free(senc); |
846ec07d | 3388 | EVP_CIPHER_CTX_free(ctx); |
bf7c6817 | 3389 | HMAC_CTX_free(hctx); |
a00d75e1 | 3390 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
e27f234a | 3391 | return 0; |
0f113f3e | 3392 | } |
67c8e7f4 | 3393 | |
f63e4288 MC |
3394 | /* |
3395 | * In TLSv1.3 this is called from the extensions code, otherwise it is used to | |
3396 | * create a separate message. Returns 1 on success or 0 on failure. | |
3397 | */ | |
3398 | int tls_construct_cert_status_body(SSL *s, WPACKET *pkt) | |
e27f234a | 3399 | { |
8cbfcc70 RS |
3400 | if (!WPACKET_put_bytes_u8(pkt, s->ext.status_type) |
3401 | || !WPACKET_sub_memcpy_u24(pkt, s->ext.ocsp.resp, | |
3402 | s->ext.ocsp.resp_len)) { | |
f63e4288 MC |
3403 | SSLerr(SSL_F_TLS_CONSTRUCT_CERT_STATUS_BODY, ERR_R_INTERNAL_ERROR); |
3404 | return 0; | |
3405 | } | |
3406 | ||
3407 | return 1; | |
3408 | } | |
3409 | ||
3410 | int tls_construct_cert_status(SSL *s, WPACKET *pkt) | |
3411 | { | |
3412 | if (!tls_construct_cert_status_body(s, pkt)) { | |
cc59ad10 | 3413 | ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
cc59ad10 MC |
3414 | return 0; |
3415 | } | |
e27f234a MC |
3416 | |
3417 | return 1; | |
3418 | } | |
3419 | ||
e481f9b9 | 3420 | #ifndef OPENSSL_NO_NEXTPROTONEG |
e27f234a MC |
3421 | /* |
3422 | * tls_process_next_proto reads a Next Protocol Negotiation handshake message. | |
3423 | * It sets the next_proto member in s if found | |
3424 | */ | |
be3583fa | 3425 | MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) |
e27f234a | 3426 | { |
73999b62 | 3427 | PACKET next_proto, padding; |
e27f234a MC |
3428 | size_t next_proto_len; |
3429 | ||
50e735f9 MC |
3430 | /*- |
3431 | * The payload looks like: | |
3432 | * uint8 proto_len; | |
3433 | * uint8 proto[proto_len]; | |
3434 | * uint8 padding_len; | |
3435 | * uint8 padding[padding_len]; | |
3436 | */ | |
73999b62 MC |
3437 | if (!PACKET_get_length_prefixed_1(pkt, &next_proto) |
3438 | || !PACKET_get_length_prefixed_1(pkt, &padding) | |
3439 | || PACKET_remaining(pkt) > 0) { | |
e27f234a | 3440 | SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH); |
c3fc7eea | 3441 | goto err; |
cf9b0b6f | 3442 | } |
0f113f3e | 3443 | |
aff8c126 RS |
3444 | if (!PACKET_memdup(&next_proto, &s->ext.npn, &next_proto_len)) { |
3445 | s->ext.npn_len = 0; | |
c3fc7eea MC |
3446 | goto err; |
3447 | } | |
3448 | ||
aff8c126 | 3449 | s->ext.npn_len = (unsigned char)next_proto_len; |
0f113f3e | 3450 | |
e27f234a | 3451 | return MSG_PROCESS_CONTINUE_READING; |
a230b26e | 3452 | err: |
fe3a3291 | 3453 | ossl_statem_set_error(s); |
e27f234a | 3454 | return MSG_PROCESS_ERROR; |
0f113f3e | 3455 | } |
6434abbf | 3456 | #endif |
d45ba43d | 3457 | |
e46f2334 MC |
3458 | static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt) |
3459 | { | |
3434f40b MC |
3460 | int al; |
3461 | ||
e96e0f8e | 3462 | if (!tls_construct_extensions(s, pkt, EXT_TLS1_3_ENCRYPTED_EXTENSIONS, |
30aeba43 | 3463 | NULL, 0, &al)) { |
3434f40b | 3464 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
e46f2334 | 3465 | SSLerr(SSL_F_TLS_CONSTRUCT_ENCRYPTED_EXTENSIONS, ERR_R_INTERNAL_ERROR); |
3434f40b | 3466 | ssl3_send_alert(s, SSL3_AL_FATAL, al); |
e46f2334 MC |
3467 | return 0; |
3468 | } | |
3469 | ||
3470 | return 1; | |
3471 | } | |
3472 | ||
d45ba43d MC |
3473 | #define SSLV2_CIPHER_LEN 3 |
3474 | ||
38a3cbfb EK |
3475 | STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, |
3476 | PACKET *cipher_suites, | |
d45ba43d | 3477 | STACK_OF(SSL_CIPHER) **skp, |
a230b26e | 3478 | int sslv2format, int *al) |
d45ba43d MC |
3479 | { |
3480 | const SSL_CIPHER *c; | |
3481 | STACK_OF(SSL_CIPHER) *sk; | |
38a3cbfb EK |
3482 | int n; |
3483 | /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */ | |
3484 | unsigned char cipher[SSLV2_CIPHER_LEN]; | |
d45ba43d | 3485 | |
38a3cbfb EK |
3486 | s->s3->send_connection_binding = 0; |
3487 | ||
3488 | n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN; | |
3489 | ||
3490 | if (PACKET_remaining(cipher_suites) == 0) { | |
3491 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED); | |
3492 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
3493 | return NULL; | |
d45ba43d | 3494 | } |
38a3cbfb EK |
3495 | |
3496 | if (PACKET_remaining(cipher_suites) % n != 0) { | |
d45ba43d MC |
3497 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3498 | SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); | |
38a3cbfb EK |
3499 | *al = SSL_AD_DECODE_ERROR; |
3500 | return NULL; | |
d45ba43d | 3501 | } |
38a3cbfb | 3502 | |
07afdf3c MC |
3503 | sk = sk_SSL_CIPHER_new_null(); |
3504 | if (sk == NULL) { | |
3505 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
3506 | *al = SSL_AD_INTERNAL_ERROR; | |
3507 | return NULL; | |
d45ba43d MC |
3508 | } |
3509 | ||
7d061fce MC |
3510 | OPENSSL_free(s->s3->tmp.ciphers_raw); |
3511 | s->s3->tmp.ciphers_raw = NULL; | |
3512 | s->s3->tmp.ciphers_rawlen = 0; | |
3513 | ||
07afdf3c MC |
3514 | if (sslv2format) { |
3515 | size_t numciphers = PACKET_remaining(cipher_suites) / n; | |
3516 | PACKET sslv2ciphers = *cipher_suites; | |
3517 | unsigned int leadbyte; | |
3518 | unsigned char *raw; | |
3519 | ||
3520 | /* | |
3521 | * We store the raw ciphers list in SSLv3+ format so we need to do some | |
3522 | * preprocessing to convert the list first. If there are any SSLv2 only | |
3523 | * ciphersuites with a non-zero leading byte then we are going to | |
3524 | * slightly over allocate because we won't store those. But that isn't a | |
3525 | * problem. | |
3526 | */ | |
f1429b85 BK |
3527 | raw = OPENSSL_malloc(numciphers * TLS_CIPHER_LEN); |
3528 | s->s3->tmp.ciphers_raw = raw; | |
07afdf3c MC |
3529 | if (raw == NULL) { |
3530 | *al = SSL_AD_INTERNAL_ERROR; | |
3531 | goto err; | |
3532 | } | |
3533 | for (s->s3->tmp.ciphers_rawlen = 0; | |
3534 | PACKET_remaining(&sslv2ciphers) > 0; | |
3535 | raw += TLS_CIPHER_LEN) { | |
3536 | if (!PACKET_get_1(&sslv2ciphers, &leadbyte) | |
3537 | || (leadbyte == 0 | |
3538 | && !PACKET_copy_bytes(&sslv2ciphers, raw, | |
3539 | TLS_CIPHER_LEN)) | |
3540 | || (leadbyte != 0 | |
3541 | && !PACKET_forward(&sslv2ciphers, TLS_CIPHER_LEN))) { | |
3542 | *al = SSL_AD_INTERNAL_ERROR; | |
63414e64 | 3543 | OPENSSL_free(s->s3->tmp.ciphers_raw); |
07afdf3c MC |
3544 | s->s3->tmp.ciphers_raw = NULL; |
3545 | s->s3->tmp.ciphers_rawlen = 0; | |
3546 | goto err; | |
3547 | } | |
3548 | if (leadbyte == 0) | |
3549 | s->s3->tmp.ciphers_rawlen += TLS_CIPHER_LEN; | |
3550 | } | |
3551 | } else if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw, | |
3552 | &s->s3->tmp.ciphers_rawlen)) { | |
38a3cbfb | 3553 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3554 | goto err; |
3555 | } | |
d45ba43d | 3556 | |
38a3cbfb EK |
3557 | while (PACKET_copy_bytes(cipher_suites, cipher, n)) { |
3558 | /* | |
20218b58 EK |
3559 | * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the |
3560 | * first byte set to zero, while true SSLv2 ciphers have a non-zero | |
3561 | * first byte. We don't support any true SSLv2 ciphers, so skip them. | |
38a3cbfb EK |
3562 | */ |
3563 | if (sslv2format && cipher[0] != '\0') | |
a230b26e | 3564 | continue; |
38a3cbfb | 3565 | |
d45ba43d | 3566 | /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */ |
38a3cbfb EK |
3567 | if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && |
3568 | (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) { | |
d45ba43d MC |
3569 | /* SCSV fatal if renegotiating */ |
3570 | if (s->renegotiate) { | |
3571 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, | |
3572 | SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); | |
38a3cbfb | 3573 | *al = SSL_AD_HANDSHAKE_FAILURE; |
d45ba43d MC |
3574 | goto err; |
3575 | } | |
3576 | s->s3->send_connection_binding = 1; | |
d45ba43d MC |
3577 | continue; |
3578 | } | |
3579 | ||
3580 | /* Check for TLS_FALLBACK_SCSV */ | |
38a3cbfb EK |
3581 | if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) && |
3582 | (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) { | |
d45ba43d MC |
3583 | /* |
3584 | * The SCSV indicates that the client previously tried a higher | |
3585 | * version. Fail if the current version is an unexpected | |
3586 | * downgrade. | |
3587 | */ | |
4fa52141 | 3588 | if (!ssl_check_version_downgrade(s)) { |
d45ba43d MC |
3589 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, |
3590 | SSL_R_INAPPROPRIATE_FALLBACK); | |
38a3cbfb | 3591 | *al = SSL_AD_INAPPROPRIATE_FALLBACK; |
d45ba43d MC |
3592 | goto err; |
3593 | } | |
d45ba43d MC |
3594 | continue; |
3595 | } | |
3596 | ||
38a3cbfb EK |
3597 | /* For SSLv2-compat, ignore leading 0-byte. */ |
3598 | c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher); | |
d45ba43d MC |
3599 | if (c != NULL) { |
3600 | if (!sk_SSL_CIPHER_push(sk, c)) { | |
3601 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE); | |
38a3cbfb | 3602 | *al = SSL_AD_INTERNAL_ERROR; |
d45ba43d MC |
3603 | goto err; |
3604 | } | |
3605 | } | |
3606 | } | |
38a3cbfb EK |
3607 | if (PACKET_remaining(cipher_suites) > 0) { |
3608 | *al = SSL_AD_INTERNAL_ERROR; | |
3609 | SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR); | |
3610 | goto err; | |
3611 | } | |
d45ba43d | 3612 | |
07afdf3c MC |
3613 | *skp = sk; |
3614 | return sk; | |
d45ba43d | 3615 | err: |
07afdf3c | 3616 | sk_SSL_CIPHER_free(sk); |
38a3cbfb | 3617 | return NULL; |
d45ba43d | 3618 | } |
7d061fce MC |
3619 | |
3620 | static int tls_construct_hello_retry_request(SSL *s, WPACKET *pkt) | |
3621 | { | |
429ff318 | 3622 | int al = SSL_AD_INTERNAL_ERROR; |
7d061fce MC |
3623 | |
3624 | /* | |
3625 | * TODO(TLS1.3): Remove the DRAFT version before release | |
3626 | * (should be s->version) | |
3627 | */ | |
3628 | if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT) | |
3629 | || !tls_construct_extensions(s, pkt, EXT_TLS1_3_HELLO_RETRY_REQUEST, | |
3630 | NULL, 0, &al)) { | |
7d061fce MC |
3631 | SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_RETRY_REQUEST, ERR_R_INTERNAL_ERROR); |
3632 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
3633 | return 0; | |
3634 | } | |
3635 | ||
3636 | /* Ditch the session. We'll create a new one next time around */ | |
3637 | SSL_SESSION_free(s->session); | |
3638 | s->session = NULL; | |
3639 | s->hit = 0; | |
3640 | ||
3641 | return 1; | |
3642 | } |