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1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.]
56  */
57 /* ====================================================================
58  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
59  *
60  * Redistribution and use in source and binary forms, with or without
61  * modification, are permitted provided that the following conditions
62  * are met:
63  *
64  * 1. Redistributions of source code must retain the above copyright
65  *    notice, this list of conditions and the following disclaimer.
66  *
67  * 2. Redistributions in binary form must reproduce the above copyright
68  *    notice, this list of conditions and the following disclaimer in
69  *    the documentation and/or other materials provided with the
70  *    distribution.
71  *
72  * 3. All advertising materials mentioning features or use of this
73  *    software must display the following acknowledgment:
74  *    "This product includes software developed by the OpenSSL Project
75  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
76  *
77  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
78  *    endorse or promote products derived from this software without
79  *    prior written permission. For written permission, please contact
80  *    openssl-core@openssl.org.
81  *
82  * 5. Products derived from this software may not be called "OpenSSL"
83  *    nor may "OpenSSL" appear in their names without prior written
84  *    permission of the OpenSSL Project.
85  *
86  * 6. Redistributions of any form whatsoever must retain the following
87  *    acknowledgment:
88  *    "This product includes software developed by the OpenSSL Project
89  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
90  *
91  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
92  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
94  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
95  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
96  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
97  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
98  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
100  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
101  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
102  * OF THE POSSIBILITY OF SUCH DAMAGE.
103  * ====================================================================
104  *
105  * This product includes cryptographic software written by Eric Young
106  * (eay@cryptsoft.com).  This product includes software written by Tim
107  * Hudson (tjh@cryptsoft.com). */
108 /* ====================================================================
109  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
110  * ECC cipher suite support in OpenSSL originally developed by
111  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */
112 
113 #include <openssl/ssl.h>
114 
115 #include <assert.h>
116 
117 #include <utility>
118 
119 #include <openssl/rand.h>
120 
121 #include "../crypto/internal.h"
122 #include "internal.h"
123 
124 
125 namespace bssl {
126 
SSL_HANDSHAKE(SSL * ssl_arg)127 SSL_HANDSHAKE::SSL_HANDSHAKE(SSL *ssl_arg)
128     : ssl(ssl_arg),
129       scts_requested(false),
130       needs_psk_binder(false),
131       received_hello_retry_request(false),
132       sent_hello_retry_request(false),
133       received_custom_extension(false),
134       handshake_finalized(false),
135       accept_psk_mode(false),
136       cert_request(false),
137       certificate_status_expected(false),
138       ocsp_stapling_requested(false),
139       should_ack_sni(false),
140       in_false_start(false),
141       in_early_data(false),
142       early_data_offered(false),
143       can_early_read(false),
144       can_early_write(false),
145       next_proto_neg_seen(false),
146       ticket_expected(false),
147       extended_master_secret(false),
148       pending_private_key_op(false),
149       grease_seeded(false) {
150 }
151 
~SSL_HANDSHAKE()152 SSL_HANDSHAKE::~SSL_HANDSHAKE() {
153   ssl->ctx->x509_method->hs_flush_cached_ca_names(this);
154 }
155 
ssl_handshake_new(SSL * ssl)156 UniquePtr<SSL_HANDSHAKE> ssl_handshake_new(SSL *ssl) {
157   UniquePtr<SSL_HANDSHAKE> hs = MakeUnique<SSL_HANDSHAKE>(ssl);
158   if (!hs ||
159       !hs->transcript.Init()) {
160     return nullptr;
161   }
162   return hs;
163 }
164 
ssl_check_message_type(SSL * ssl,const SSLMessage & msg,int type)165 bool ssl_check_message_type(SSL *ssl, const SSLMessage &msg, int type) {
166   if (msg.type != type) {
167     ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
168     OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
169     ERR_add_error_dataf("got type %d, wanted type %d", msg.type, type);
170     return false;
171   }
172 
173   return true;
174 }
175 
ssl_add_message_cbb(SSL * ssl,CBB * cbb)176 bool ssl_add_message_cbb(SSL *ssl, CBB *cbb) {
177   Array<uint8_t> msg;
178   if (!ssl->method->finish_message(ssl, cbb, &msg) ||
179       !ssl->method->add_message(ssl, std::move(msg))) {
180     return false;
181   }
182 
183   return true;
184 }
185 
ssl_max_handshake_message_len(const SSL * ssl)186 size_t ssl_max_handshake_message_len(const SSL *ssl) {
187   // kMaxMessageLen is the default maximum message size for handshakes which do
188   // not accept peer certificate chains.
189   static const size_t kMaxMessageLen = 16384;
190 
191   if (SSL_in_init(ssl)) {
192     if ((!ssl->server || (ssl->verify_mode & SSL_VERIFY_PEER)) &&
193         kMaxMessageLen < ssl->max_cert_list) {
194       return ssl->max_cert_list;
195     }
196     return kMaxMessageLen;
197   }
198 
199   if (ssl_protocol_version(ssl) < TLS1_3_VERSION) {
200     // In TLS 1.2 and below, the largest acceptable post-handshake message is
201     // a HelloRequest.
202     return 0;
203   }
204 
205   if (ssl->server) {
206     // The largest acceptable post-handshake message for a server is a
207     // KeyUpdate. We will never initiate post-handshake auth.
208     return 1;
209   }
210 
211   // Clients must accept NewSessionTicket, so allow the default size.
212   return kMaxMessageLen;
213 }
214 
ssl_hash_message(SSL_HANDSHAKE * hs,const SSLMessage & msg)215 bool ssl_hash_message(SSL_HANDSHAKE *hs, const SSLMessage &msg) {
216   // V2ClientHello messages are pre-hashed.
217   if (msg.is_v2_hello) {
218     return true;
219   }
220 
221   return hs->transcript.Update(msg.raw);
222 }
223 
ssl_parse_extensions(const CBS * cbs,uint8_t * out_alert,const SSL_EXTENSION_TYPE * ext_types,size_t num_ext_types,int ignore_unknown)224 int ssl_parse_extensions(const CBS *cbs, uint8_t *out_alert,
225                          const SSL_EXTENSION_TYPE *ext_types,
226                          size_t num_ext_types, int ignore_unknown) {
227   // Reset everything.
228   for (size_t i = 0; i < num_ext_types; i++) {
229     *ext_types[i].out_present = 0;
230     CBS_init(ext_types[i].out_data, NULL, 0);
231   }
232 
233   CBS copy = *cbs;
234   while (CBS_len(&copy) != 0) {
235     uint16_t type;
236     CBS data;
237     if (!CBS_get_u16(&copy, &type) ||
238         !CBS_get_u16_length_prefixed(&copy, &data)) {
239       OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
240       *out_alert = SSL_AD_DECODE_ERROR;
241       return 0;
242     }
243 
244     const SSL_EXTENSION_TYPE *ext_type = NULL;
245     for (size_t i = 0; i < num_ext_types; i++) {
246       if (type == ext_types[i].type) {
247         ext_type = &ext_types[i];
248         break;
249       }
250     }
251 
252     if (ext_type == NULL) {
253       if (ignore_unknown) {
254         continue;
255       }
256       OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
257       *out_alert = SSL_AD_UNSUPPORTED_EXTENSION;
258       return 0;
259     }
260 
261     // Duplicate ext_types are forbidden.
262     if (*ext_type->out_present) {
263       OPENSSL_PUT_ERROR(SSL, SSL_R_DUPLICATE_EXTENSION);
264       *out_alert = SSL_AD_ILLEGAL_PARAMETER;
265       return 0;
266     }
267 
268     *ext_type->out_present = 1;
269     *ext_type->out_data = data;
270   }
271 
272   return 1;
273 }
274 
set_crypto_buffer(CRYPTO_BUFFER ** dest,CRYPTO_BUFFER * src)275 static void set_crypto_buffer(CRYPTO_BUFFER **dest, CRYPTO_BUFFER *src) {
276   // TODO(davidben): Remove this helper once |SSL_SESSION| can use |UniquePtr|
277   // and |UniquePtr| has up_ref helpers.
278   CRYPTO_BUFFER_free(*dest);
279   *dest = src;
280   if (src != nullptr) {
281     CRYPTO_BUFFER_up_ref(src);
282   }
283 }
284 
ssl_verify_peer_cert(SSL_HANDSHAKE * hs)285 enum ssl_verify_result_t ssl_verify_peer_cert(SSL_HANDSHAKE *hs) {
286   SSL *const ssl = hs->ssl;
287   const SSL_SESSION *prev_session = ssl->s3->established_session.get();
288   if (prev_session != NULL) {
289     // If renegotiating, the server must not change the server certificate. See
290     // https://mitls.org/pages/attacks/3SHAKE. We never resume on renegotiation,
291     // so this check is sufficient to ensure the reported peer certificate never
292     // changes on renegotiation.
293     assert(!ssl->server);
294     if (sk_CRYPTO_BUFFER_num(prev_session->certs) !=
295         sk_CRYPTO_BUFFER_num(hs->new_session->certs)) {
296       OPENSSL_PUT_ERROR(SSL, SSL_R_SERVER_CERT_CHANGED);
297       ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
298       return ssl_verify_invalid;
299     }
300 
301     for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(hs->new_session->certs); i++) {
302       const CRYPTO_BUFFER *old_cert =
303           sk_CRYPTO_BUFFER_value(prev_session->certs, i);
304       const CRYPTO_BUFFER *new_cert =
305           sk_CRYPTO_BUFFER_value(hs->new_session->certs, i);
306       if (CRYPTO_BUFFER_len(old_cert) != CRYPTO_BUFFER_len(new_cert) ||
307           OPENSSL_memcmp(CRYPTO_BUFFER_data(old_cert),
308                          CRYPTO_BUFFER_data(new_cert),
309                          CRYPTO_BUFFER_len(old_cert)) != 0) {
310         OPENSSL_PUT_ERROR(SSL, SSL_R_SERVER_CERT_CHANGED);
311         ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
312         return ssl_verify_invalid;
313       }
314     }
315 
316     // The certificate is identical, so we may skip re-verifying the
317     // certificate. Since we only authenticated the previous one, copy other
318     // authentication from the established session and ignore what was newly
319     // received.
320     set_crypto_buffer(&hs->new_session->ocsp_response,
321                       prev_session->ocsp_response);
322     set_crypto_buffer(&hs->new_session->signed_cert_timestamp_list,
323                       prev_session->signed_cert_timestamp_list);
324     hs->new_session->verify_result = prev_session->verify_result;
325     return ssl_verify_ok;
326   }
327 
328   uint8_t alert = SSL_AD_CERTIFICATE_UNKNOWN;
329   enum ssl_verify_result_t ret;
330   if (ssl->custom_verify_callback != nullptr) {
331     ret = ssl->custom_verify_callback(ssl, &alert);
332     switch (ret) {
333       case ssl_verify_ok:
334         hs->new_session->verify_result = X509_V_OK;
335         break;
336       case ssl_verify_invalid:
337         // If |SSL_VERIFY_NONE|, the error is non-fatal, but we keep the result.
338         if (ssl->verify_mode == SSL_VERIFY_NONE) {
339           ERR_clear_error();
340           ret = ssl_verify_ok;
341         }
342         hs->new_session->verify_result = X509_V_ERR_APPLICATION_VERIFICATION;
343         break;
344       case ssl_verify_retry:
345         break;
346     }
347   } else {
348     ret = ssl->ctx->x509_method->session_verify_cert_chain(
349               hs->new_session.get(), ssl, &alert)
350               ? ssl_verify_ok
351               : ssl_verify_invalid;
352   }
353 
354   if (ret == ssl_verify_invalid) {
355     OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_VERIFY_FAILED);
356     ssl_send_alert(ssl, SSL3_AL_FATAL, alert);
357   }
358 
359   return ret;
360 }
361 
ssl_get_grease_value(SSL_HANDSHAKE * hs,enum ssl_grease_index_t index)362 uint16_t ssl_get_grease_value(SSL_HANDSHAKE *hs,
363                               enum ssl_grease_index_t index) {
364   // Draw entropy for all GREASE values at once. This avoids calling
365   // |RAND_bytes| repeatedly and makes the values consistent within a
366   // connection. The latter is so the second ClientHello matches after
367   // HelloRetryRequest and so supported_groups and key_shares are consistent.
368   if (!hs->grease_seeded) {
369     RAND_bytes(hs->grease_seed, sizeof(hs->grease_seed));
370     hs->grease_seeded = true;
371   }
372 
373   // This generates a random value of the form 0xωaωa, for all 0 ≤ ω < 16.
374   uint16_t ret = hs->grease_seed[index];
375   ret = (ret & 0xf0) | 0x0a;
376   ret |= ret << 8;
377   return ret;
378 }
379 
ssl_get_finished(SSL_HANDSHAKE * hs)380 enum ssl_hs_wait_t ssl_get_finished(SSL_HANDSHAKE *hs) {
381   SSL *const ssl = hs->ssl;
382   SSLMessage msg;
383   if (!ssl->method->get_message(ssl, &msg)) {
384     return ssl_hs_read_message;
385   }
386 
387   if (!ssl_check_message_type(ssl, msg, SSL3_MT_FINISHED)) {
388     return ssl_hs_error;
389   }
390 
391   // Snapshot the finished hash before incorporating the new message.
392   uint8_t finished[EVP_MAX_MD_SIZE];
393   size_t finished_len;
394   if (!hs->transcript.GetFinishedMAC(finished, &finished_len,
395                                      SSL_get_session(ssl), !ssl->server) ||
396       !ssl_hash_message(hs, msg)) {
397     return ssl_hs_error;
398   }
399 
400   int finished_ok = CBS_mem_equal(&msg.body, finished, finished_len);
401 #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
402   finished_ok = 1;
403 #endif
404   if (!finished_ok) {
405     ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
406     OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
407     return ssl_hs_error;
408   }
409 
410   // Copy the Finished so we can use it for renegotiation checks.
411   if (ssl->version != SSL3_VERSION) {
412     if (finished_len > sizeof(ssl->s3->previous_client_finished) ||
413         finished_len > sizeof(ssl->s3->previous_server_finished)) {
414       OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
415       return ssl_hs_error;
416     }
417 
418     if (ssl->server) {
419       OPENSSL_memcpy(ssl->s3->previous_client_finished, finished, finished_len);
420       ssl->s3->previous_client_finished_len = finished_len;
421     } else {
422       OPENSSL_memcpy(ssl->s3->previous_server_finished, finished, finished_len);
423       ssl->s3->previous_server_finished_len = finished_len;
424     }
425   }
426 
427   ssl->method->next_message(ssl);
428   return ssl_hs_ok;
429 }
430 
ssl_send_finished(SSL_HANDSHAKE * hs)431 bool ssl_send_finished(SSL_HANDSHAKE *hs) {
432   SSL *const ssl = hs->ssl;
433   const SSL_SESSION *session = SSL_get_session(ssl);
434 
435   uint8_t finished[EVP_MAX_MD_SIZE];
436   size_t finished_len;
437   if (!hs->transcript.GetFinishedMAC(finished, &finished_len, session,
438                                      ssl->server)) {
439     return 0;
440   }
441 
442   // Log the master secret, if logging is enabled.
443   if (!ssl_log_secret(ssl, "CLIENT_RANDOM",
444                       session->master_key,
445                       session->master_key_length)) {
446     return 0;
447   }
448 
449   // Copy the Finished so we can use it for renegotiation checks.
450   if (ssl->version != SSL3_VERSION) {
451     if (finished_len > sizeof(ssl->s3->previous_client_finished) ||
452         finished_len > sizeof(ssl->s3->previous_server_finished)) {
453       OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
454       return 0;
455     }
456 
457     if (ssl->server) {
458       OPENSSL_memcpy(ssl->s3->previous_server_finished, finished, finished_len);
459       ssl->s3->previous_server_finished_len = finished_len;
460     } else {
461       OPENSSL_memcpy(ssl->s3->previous_client_finished, finished, finished_len);
462       ssl->s3->previous_client_finished_len = finished_len;
463     }
464   }
465 
466   ScopedCBB cbb;
467   CBB body;
468   if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_FINISHED) ||
469       !CBB_add_bytes(&body, finished, finished_len) ||
470       !ssl_add_message_cbb(ssl, cbb.get())) {
471     OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
472     return 0;
473   }
474 
475   return 1;
476 }
477 
ssl_output_cert_chain(SSL * ssl)478 bool ssl_output_cert_chain(SSL *ssl) {
479   ScopedCBB cbb;
480   CBB body;
481   if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CERTIFICATE) ||
482       !ssl_add_cert_chain(ssl, &body) ||
483       !ssl_add_message_cbb(ssl, cbb.get())) {
484     OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
485     return false;
486   }
487 
488   return true;
489 }
490 
ssl_run_handshake(SSL_HANDSHAKE * hs,bool * out_early_return)491 int ssl_run_handshake(SSL_HANDSHAKE *hs, bool *out_early_return) {
492   SSL *const ssl = hs->ssl;
493   for (;;) {
494     // Resolve the operation the handshake was waiting on.
495     switch (hs->wait) {
496       case ssl_hs_error:
497         ERR_restore_state(hs->error.get());
498         return -1;
499 
500       case ssl_hs_flush: {
501         int ret = ssl->method->flush_flight(ssl);
502         if (ret <= 0) {
503           return ret;
504         }
505         break;
506       }
507 
508       case ssl_hs_read_server_hello:
509       case ssl_hs_read_message:
510       case ssl_hs_read_change_cipher_spec: {
511         uint8_t alert = SSL_AD_DECODE_ERROR;
512         size_t consumed = 0;
513         ssl_open_record_t ret;
514         if (hs->wait == ssl_hs_read_change_cipher_spec) {
515           ret = ssl_open_change_cipher_spec(ssl, &consumed, &alert,
516                                             ssl->s3->read_buffer.span());
517         } else {
518           ret = ssl_open_handshake(ssl, &consumed, &alert,
519                                    ssl->s3->read_buffer.span());
520         }
521         if (ret == ssl_open_record_error &&
522             hs->wait == ssl_hs_read_server_hello) {
523           uint32_t err = ERR_peek_error();
524           if (ERR_GET_LIB(err) == ERR_LIB_SSL &&
525               ERR_GET_REASON(err) == SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE) {
526             // Add a dedicated error code to the queue for a handshake_failure
527             // alert in response to ClientHello. This matches NSS's client
528             // behavior and gives a better error on a (probable) failure to
529             // negotiate initial parameters. Note: this error code comes after
530             // the original one.
531             //
532             // See https://crbug.com/446505.
533             OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_FAILURE_ON_CLIENT_HELLO);
534           }
535         }
536         bool retry;
537         int bio_ret = ssl_handle_open_record(ssl, &retry, ret, consumed, alert);
538         if (bio_ret <= 0) {
539           return bio_ret;
540         }
541         if (retry) {
542           continue;
543         }
544         ssl->s3->read_buffer.DiscardConsumed();
545         break;
546       }
547 
548       case ssl_hs_read_end_of_early_data: {
549         if (ssl->s3->hs->can_early_read) {
550           // While we are processing early data, the handshake returns early.
551           *out_early_return = true;
552           return 1;
553         }
554         hs->wait = ssl_hs_ok;
555         break;
556       }
557 
558       case ssl_hs_certificate_selection_pending:
559         ssl->s3->rwstate = SSL_CERTIFICATE_SELECTION_PENDING;
560         hs->wait = ssl_hs_ok;
561         return -1;
562 
563       case ssl_hs_handoff:
564         ssl->s3->rwstate = SSL_HANDOFF;
565         hs->wait = ssl_hs_ok;
566         return -1;
567 
568       case ssl_hs_x509_lookup:
569         ssl->s3->rwstate = SSL_X509_LOOKUP;
570         hs->wait = ssl_hs_ok;
571         return -1;
572 
573       case ssl_hs_channel_id_lookup:
574         ssl->s3->rwstate = SSL_CHANNEL_ID_LOOKUP;
575         hs->wait = ssl_hs_ok;
576         return -1;
577 
578       case ssl_hs_private_key_operation:
579         ssl->s3->rwstate = SSL_PRIVATE_KEY_OPERATION;
580         hs->wait = ssl_hs_ok;
581         return -1;
582 
583       case ssl_hs_pending_session:
584         ssl->s3->rwstate = SSL_PENDING_SESSION;
585         hs->wait = ssl_hs_ok;
586         return -1;
587 
588       case ssl_hs_pending_ticket:
589         ssl->s3->rwstate = SSL_PENDING_TICKET;
590         hs->wait = ssl_hs_ok;
591         return -1;
592 
593       case ssl_hs_certificate_verify:
594         ssl->s3->rwstate = SSL_CERTIFICATE_VERIFY;
595         hs->wait = ssl_hs_ok;
596         return -1;
597 
598       case ssl_hs_early_data_rejected:
599         ssl->s3->rwstate = SSL_EARLY_DATA_REJECTED;
600         // Cause |SSL_write| to start failing immediately.
601         hs->can_early_write = false;
602         return -1;
603 
604       case ssl_hs_early_return:
605         *out_early_return = true;
606         hs->wait = ssl_hs_ok;
607         return 1;
608 
609       case ssl_hs_ok:
610         break;
611     }
612 
613     // Run the state machine again.
614     hs->wait = ssl->do_handshake(hs);
615     if (hs->wait == ssl_hs_error) {
616       hs->error.reset(ERR_save_state());
617       return -1;
618     }
619     if (hs->wait == ssl_hs_ok) {
620       // The handshake has completed.
621       *out_early_return = false;
622       return 1;
623     }
624 
625     // Otherwise, loop to the beginning and resolve what was blocking the
626     // handshake.
627   }
628 }
629 
630 }  // namespace bssl
631