xref: /freebsd/crypto/openssl/ssl/ssl_lib.c (revision c93b6e5fa24ba172ab271432c6692f9cc604e15a)
1 /*
2  * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4  * Copyright 2005 Nokia. All rights reserved.
5  *
6  * Licensed under the OpenSSL license (the "License").  You may not use
7  * this file except in compliance with the License.  You can obtain a copy
8  * in the file LICENSE in the source distribution or at
9  * https://www.openssl.org/source/license.html
10  */
11 
12 #include <stdio.h>
13 #include "ssl_locl.h"
14 #include <openssl/objects.h>
15 #include <openssl/x509v3.h>
16 #include <openssl/rand.h>
17 #include <openssl/rand_drbg.h>
18 #include <openssl/ocsp.h>
19 #include <openssl/dh.h>
20 #include <openssl/engine.h>
21 #include <openssl/async.h>
22 #include <openssl/ct.h>
23 #include "internal/cryptlib.h"
24 #include "internal/refcount.h"
25 
26 const char SSL_version_str[] = OPENSSL_VERSION_TEXT;
27 
28 static int ssl_undefined_function_1(SSL *ssl, SSL3_RECORD *r, size_t s, int t)
29 {
30     (void)r;
31     (void)s;
32     (void)t;
33     return ssl_undefined_function(ssl);
34 }
35 
36 static int ssl_undefined_function_2(SSL *ssl, SSL3_RECORD *r, unsigned char *s,
37                                     int t)
38 {
39     (void)r;
40     (void)s;
41     (void)t;
42     return ssl_undefined_function(ssl);
43 }
44 
45 static int ssl_undefined_function_3(SSL *ssl, unsigned char *r,
46                                     unsigned char *s, size_t t, size_t *u)
47 {
48     (void)r;
49     (void)s;
50     (void)t;
51     (void)u;
52     return ssl_undefined_function(ssl);
53 }
54 
55 static int ssl_undefined_function_4(SSL *ssl, int r)
56 {
57     (void)r;
58     return ssl_undefined_function(ssl);
59 }
60 
61 static size_t ssl_undefined_function_5(SSL *ssl, const char *r, size_t s,
62                                        unsigned char *t)
63 {
64     (void)r;
65     (void)s;
66     (void)t;
67     return ssl_undefined_function(ssl);
68 }
69 
70 static int ssl_undefined_function_6(int r)
71 {
72     (void)r;
73     return ssl_undefined_function(NULL);
74 }
75 
76 static int ssl_undefined_function_7(SSL *ssl, unsigned char *r, size_t s,
77                                     const char *t, size_t u,
78                                     const unsigned char *v, size_t w, int x)
79 {
80     (void)r;
81     (void)s;
82     (void)t;
83     (void)u;
84     (void)v;
85     (void)w;
86     (void)x;
87     return ssl_undefined_function(ssl);
88 }
89 
90 SSL3_ENC_METHOD ssl3_undef_enc_method = {
91     ssl_undefined_function_1,
92     ssl_undefined_function_2,
93     ssl_undefined_function,
94     ssl_undefined_function_3,
95     ssl_undefined_function_4,
96     ssl_undefined_function_5,
97     NULL,                       /* client_finished_label */
98     0,                          /* client_finished_label_len */
99     NULL,                       /* server_finished_label */
100     0,                          /* server_finished_label_len */
101     ssl_undefined_function_6,
102     ssl_undefined_function_7,
103 };
104 
105 struct ssl_async_args {
106     SSL *s;
107     void *buf;
108     size_t num;
109     enum { READFUNC, WRITEFUNC, OTHERFUNC } type;
110     union {
111         int (*func_read) (SSL *, void *, size_t, size_t *);
112         int (*func_write) (SSL *, const void *, size_t, size_t *);
113         int (*func_other) (SSL *);
114     } f;
115 };
116 
117 static const struct {
118     uint8_t mtype;
119     uint8_t ord;
120     int nid;
121 } dane_mds[] = {
122     {
123         DANETLS_MATCHING_FULL, 0, NID_undef
124     },
125     {
126         DANETLS_MATCHING_2256, 1, NID_sha256
127     },
128     {
129         DANETLS_MATCHING_2512, 2, NID_sha512
130     },
131 };
132 
133 static int dane_ctx_enable(struct dane_ctx_st *dctx)
134 {
135     const EVP_MD **mdevp;
136     uint8_t *mdord;
137     uint8_t mdmax = DANETLS_MATCHING_LAST;
138     int n = ((int)mdmax) + 1;   /* int to handle PrivMatch(255) */
139     size_t i;
140 
141     if (dctx->mdevp != NULL)
142         return 1;
143 
144     mdevp = OPENSSL_zalloc(n * sizeof(*mdevp));
145     mdord = OPENSSL_zalloc(n * sizeof(*mdord));
146 
147     if (mdord == NULL || mdevp == NULL) {
148         OPENSSL_free(mdord);
149         OPENSSL_free(mdevp);
150         SSLerr(SSL_F_DANE_CTX_ENABLE, ERR_R_MALLOC_FAILURE);
151         return 0;
152     }
153 
154     /* Install default entries */
155     for (i = 0; i < OSSL_NELEM(dane_mds); ++i) {
156         const EVP_MD *md;
157 
158         if (dane_mds[i].nid == NID_undef ||
159             (md = EVP_get_digestbynid(dane_mds[i].nid)) == NULL)
160             continue;
161         mdevp[dane_mds[i].mtype] = md;
162         mdord[dane_mds[i].mtype] = dane_mds[i].ord;
163     }
164 
165     dctx->mdevp = mdevp;
166     dctx->mdord = mdord;
167     dctx->mdmax = mdmax;
168 
169     return 1;
170 }
171 
172 static void dane_ctx_final(struct dane_ctx_st *dctx)
173 {
174     OPENSSL_free(dctx->mdevp);
175     dctx->mdevp = NULL;
176 
177     OPENSSL_free(dctx->mdord);
178     dctx->mdord = NULL;
179     dctx->mdmax = 0;
180 }
181 
182 static void tlsa_free(danetls_record *t)
183 {
184     if (t == NULL)
185         return;
186     OPENSSL_free(t->data);
187     EVP_PKEY_free(t->spki);
188     OPENSSL_free(t);
189 }
190 
191 static void dane_final(SSL_DANE *dane)
192 {
193     sk_danetls_record_pop_free(dane->trecs, tlsa_free);
194     dane->trecs = NULL;
195 
196     sk_X509_pop_free(dane->certs, X509_free);
197     dane->certs = NULL;
198 
199     X509_free(dane->mcert);
200     dane->mcert = NULL;
201     dane->mtlsa = NULL;
202     dane->mdpth = -1;
203     dane->pdpth = -1;
204 }
205 
206 /*
207  * dane_copy - Copy dane configuration, sans verification state.
208  */
209 static int ssl_dane_dup(SSL *to, SSL *from)
210 {
211     int num;
212     int i;
213 
214     if (!DANETLS_ENABLED(&from->dane))
215         return 1;
216 
217     num = sk_danetls_record_num(from->dane.trecs);
218     dane_final(&to->dane);
219     to->dane.flags = from->dane.flags;
220     to->dane.dctx = &to->ctx->dane;
221     to->dane.trecs = sk_danetls_record_new_reserve(NULL, num);
222 
223     if (to->dane.trecs == NULL) {
224         SSLerr(SSL_F_SSL_DANE_DUP, ERR_R_MALLOC_FAILURE);
225         return 0;
226     }
227 
228     for (i = 0; i < num; ++i) {
229         danetls_record *t = sk_danetls_record_value(from->dane.trecs, i);
230 
231         if (SSL_dane_tlsa_add(to, t->usage, t->selector, t->mtype,
232                               t->data, t->dlen) <= 0)
233             return 0;
234     }
235     return 1;
236 }
237 
238 static int dane_mtype_set(struct dane_ctx_st *dctx,
239                           const EVP_MD *md, uint8_t mtype, uint8_t ord)
240 {
241     int i;
242 
243     if (mtype == DANETLS_MATCHING_FULL && md != NULL) {
244         SSLerr(SSL_F_DANE_MTYPE_SET, SSL_R_DANE_CANNOT_OVERRIDE_MTYPE_FULL);
245         return 0;
246     }
247 
248     if (mtype > dctx->mdmax) {
249         const EVP_MD **mdevp;
250         uint8_t *mdord;
251         int n = ((int)mtype) + 1;
252 
253         mdevp = OPENSSL_realloc(dctx->mdevp, n * sizeof(*mdevp));
254         if (mdevp == NULL) {
255             SSLerr(SSL_F_DANE_MTYPE_SET, ERR_R_MALLOC_FAILURE);
256             return -1;
257         }
258         dctx->mdevp = mdevp;
259 
260         mdord = OPENSSL_realloc(dctx->mdord, n * sizeof(*mdord));
261         if (mdord == NULL) {
262             SSLerr(SSL_F_DANE_MTYPE_SET, ERR_R_MALLOC_FAILURE);
263             return -1;
264         }
265         dctx->mdord = mdord;
266 
267         /* Zero-fill any gaps */
268         for (i = dctx->mdmax + 1; i < mtype; ++i) {
269             mdevp[i] = NULL;
270             mdord[i] = 0;
271         }
272 
273         dctx->mdmax = mtype;
274     }
275 
276     dctx->mdevp[mtype] = md;
277     /* Coerce ordinal of disabled matching types to 0 */
278     dctx->mdord[mtype] = (md == NULL) ? 0 : ord;
279 
280     return 1;
281 }
282 
283 static const EVP_MD *tlsa_md_get(SSL_DANE *dane, uint8_t mtype)
284 {
285     if (mtype > dane->dctx->mdmax)
286         return NULL;
287     return dane->dctx->mdevp[mtype];
288 }
289 
290 static int dane_tlsa_add(SSL_DANE *dane,
291                          uint8_t usage,
292                          uint8_t selector,
293                          uint8_t mtype, unsigned const char *data, size_t dlen)
294 {
295     danetls_record *t;
296     const EVP_MD *md = NULL;
297     int ilen = (int)dlen;
298     int i;
299     int num;
300 
301     if (dane->trecs == NULL) {
302         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_NOT_ENABLED);
303         return -1;
304     }
305 
306     if (ilen < 0 || dlen != (size_t)ilen) {
307         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_DATA_LENGTH);
308         return 0;
309     }
310 
311     if (usage > DANETLS_USAGE_LAST) {
312         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE_USAGE);
313         return 0;
314     }
315 
316     if (selector > DANETLS_SELECTOR_LAST) {
317         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_SELECTOR);
318         return 0;
319     }
320 
321     if (mtype != DANETLS_MATCHING_FULL) {
322         md = tlsa_md_get(dane, mtype);
323         if (md == NULL) {
324             SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_MATCHING_TYPE);
325             return 0;
326         }
327     }
328 
329     if (md != NULL && dlen != (size_t)EVP_MD_size(md)) {
330         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_DIGEST_LENGTH);
331         return 0;
332     }
333     if (!data) {
334         SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_NULL_DATA);
335         return 0;
336     }
337 
338     if ((t = OPENSSL_zalloc(sizeof(*t))) == NULL) {
339         SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
340         return -1;
341     }
342 
343     t->usage = usage;
344     t->selector = selector;
345     t->mtype = mtype;
346     t->data = OPENSSL_malloc(dlen);
347     if (t->data == NULL) {
348         tlsa_free(t);
349         SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
350         return -1;
351     }
352     memcpy(t->data, data, dlen);
353     t->dlen = dlen;
354 
355     /* Validate and cache full certificate or public key */
356     if (mtype == DANETLS_MATCHING_FULL) {
357         const unsigned char *p = data;
358         X509 *cert = NULL;
359         EVP_PKEY *pkey = NULL;
360 
361         switch (selector) {
362         case DANETLS_SELECTOR_CERT:
363             if (!d2i_X509(&cert, &p, ilen) || p < data ||
364                 dlen != (size_t)(p - data)) {
365                 tlsa_free(t);
366                 SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE);
367                 return 0;
368             }
369             if (X509_get0_pubkey(cert) == NULL) {
370                 tlsa_free(t);
371                 SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE);
372                 return 0;
373             }
374 
375             if ((DANETLS_USAGE_BIT(usage) & DANETLS_TA_MASK) == 0) {
376                 X509_free(cert);
377                 break;
378             }
379 
380             /*
381              * For usage DANE-TA(2), we support authentication via "2 0 0" TLSA
382              * records that contain full certificates of trust-anchors that are
383              * not present in the wire chain.  For usage PKIX-TA(0), we augment
384              * the chain with untrusted Full(0) certificates from DNS, in case
385              * they are missing from the chain.
386              */
387             if ((dane->certs == NULL &&
388                  (dane->certs = sk_X509_new_null()) == NULL) ||
389                 !sk_X509_push(dane->certs, cert)) {
390                 SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
391                 X509_free(cert);
392                 tlsa_free(t);
393                 return -1;
394             }
395             break;
396 
397         case DANETLS_SELECTOR_SPKI:
398             if (!d2i_PUBKEY(&pkey, &p, ilen) || p < data ||
399                 dlen != (size_t)(p - data)) {
400                 tlsa_free(t);
401                 SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_PUBLIC_KEY);
402                 return 0;
403             }
404 
405             /*
406              * For usage DANE-TA(2), we support authentication via "2 1 0" TLSA
407              * records that contain full bare keys of trust-anchors that are
408              * not present in the wire chain.
409              */
410             if (usage == DANETLS_USAGE_DANE_TA)
411                 t->spki = pkey;
412             else
413                 EVP_PKEY_free(pkey);
414             break;
415         }
416     }
417 
418     /*-
419      * Find the right insertion point for the new record.
420      *
421      * See crypto/x509/x509_vfy.c.  We sort DANE-EE(3) records first, so that
422      * they can be processed first, as they require no chain building, and no
423      * expiration or hostname checks.  Because DANE-EE(3) is numerically
424      * largest, this is accomplished via descending sort by "usage".
425      *
426      * We also sort in descending order by matching ordinal to simplify
427      * the implementation of digest agility in the verification code.
428      *
429      * The choice of order for the selector is not significant, so we
430      * use the same descending order for consistency.
431      */
432     num = sk_danetls_record_num(dane->trecs);
433     for (i = 0; i < num; ++i) {
434         danetls_record *rec = sk_danetls_record_value(dane->trecs, i);
435 
436         if (rec->usage > usage)
437             continue;
438         if (rec->usage < usage)
439             break;
440         if (rec->selector > selector)
441             continue;
442         if (rec->selector < selector)
443             break;
444         if (dane->dctx->mdord[rec->mtype] > dane->dctx->mdord[mtype])
445             continue;
446         break;
447     }
448 
449     if (!sk_danetls_record_insert(dane->trecs, t, i)) {
450         tlsa_free(t);
451         SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
452         return -1;
453     }
454     dane->umask |= DANETLS_USAGE_BIT(usage);
455 
456     return 1;
457 }
458 
459 /*
460  * Return 0 if there is only one version configured and it was disabled
461  * at configure time.  Return 1 otherwise.
462  */
463 static int ssl_check_allowed_versions(int min_version, int max_version)
464 {
465     int minisdtls = 0, maxisdtls = 0;
466 
467     /* Figure out if we're doing DTLS versions or TLS versions */
468     if (min_version == DTLS1_BAD_VER
469         || min_version >> 8 == DTLS1_VERSION_MAJOR)
470         minisdtls = 1;
471     if (max_version == DTLS1_BAD_VER
472         || max_version >> 8 == DTLS1_VERSION_MAJOR)
473         maxisdtls = 1;
474     /* A wildcard version of 0 could be DTLS or TLS. */
475     if ((minisdtls && !maxisdtls && max_version != 0)
476         || (maxisdtls && !minisdtls && min_version != 0)) {
477         /* Mixing DTLS and TLS versions will lead to sadness; deny it. */
478         return 0;
479     }
480 
481     if (minisdtls || maxisdtls) {
482         /* Do DTLS version checks. */
483         if (min_version == 0)
484             /* Ignore DTLS1_BAD_VER */
485             min_version = DTLS1_VERSION;
486         if (max_version == 0)
487             max_version = DTLS1_2_VERSION;
488 #ifdef OPENSSL_NO_DTLS1_2
489         if (max_version == DTLS1_2_VERSION)
490             max_version = DTLS1_VERSION;
491 #endif
492 #ifdef OPENSSL_NO_DTLS1
493         if (min_version == DTLS1_VERSION)
494             min_version = DTLS1_2_VERSION;
495 #endif
496         /* Done massaging versions; do the check. */
497         if (0
498 #ifdef OPENSSL_NO_DTLS1
499             || (DTLS_VERSION_GE(min_version, DTLS1_VERSION)
500                 && DTLS_VERSION_GE(DTLS1_VERSION, max_version))
501 #endif
502 #ifdef OPENSSL_NO_DTLS1_2
503             || (DTLS_VERSION_GE(min_version, DTLS1_2_VERSION)
504                 && DTLS_VERSION_GE(DTLS1_2_VERSION, max_version))
505 #endif
506             )
507             return 0;
508     } else {
509         /* Regular TLS version checks. */
510         if (min_version == 0)
511             min_version = SSL3_VERSION;
512         if (max_version == 0)
513             max_version = TLS1_3_VERSION;
514 #ifdef OPENSSL_NO_TLS1_3
515         if (max_version == TLS1_3_VERSION)
516             max_version = TLS1_2_VERSION;
517 #endif
518 #ifdef OPENSSL_NO_TLS1_2
519         if (max_version == TLS1_2_VERSION)
520             max_version = TLS1_1_VERSION;
521 #endif
522 #ifdef OPENSSL_NO_TLS1_1
523         if (max_version == TLS1_1_VERSION)
524             max_version = TLS1_VERSION;
525 #endif
526 #ifdef OPENSSL_NO_TLS1
527         if (max_version == TLS1_VERSION)
528             max_version = SSL3_VERSION;
529 #endif
530 #ifdef OPENSSL_NO_SSL3
531         if (min_version == SSL3_VERSION)
532             min_version = TLS1_VERSION;
533 #endif
534 #ifdef OPENSSL_NO_TLS1
535         if (min_version == TLS1_VERSION)
536             min_version = TLS1_1_VERSION;
537 #endif
538 #ifdef OPENSSL_NO_TLS1_1
539         if (min_version == TLS1_1_VERSION)
540             min_version = TLS1_2_VERSION;
541 #endif
542 #ifdef OPENSSL_NO_TLS1_2
543         if (min_version == TLS1_2_VERSION)
544             min_version = TLS1_3_VERSION;
545 #endif
546         /* Done massaging versions; do the check. */
547         if (0
548 #ifdef OPENSSL_NO_SSL3
549             || (min_version <= SSL3_VERSION && SSL3_VERSION <= max_version)
550 #endif
551 #ifdef OPENSSL_NO_TLS1
552             || (min_version <= TLS1_VERSION && TLS1_VERSION <= max_version)
553 #endif
554 #ifdef OPENSSL_NO_TLS1_1
555             || (min_version <= TLS1_1_VERSION && TLS1_1_VERSION <= max_version)
556 #endif
557 #ifdef OPENSSL_NO_TLS1_2
558             || (min_version <= TLS1_2_VERSION && TLS1_2_VERSION <= max_version)
559 #endif
560 #ifdef OPENSSL_NO_TLS1_3
561             || (min_version <= TLS1_3_VERSION && TLS1_3_VERSION <= max_version)
562 #endif
563             )
564             return 0;
565     }
566     return 1;
567 }
568 
569 static void clear_ciphers(SSL *s)
570 {
571     /* clear the current cipher */
572     ssl_clear_cipher_ctx(s);
573     ssl_clear_hash_ctx(&s->read_hash);
574     ssl_clear_hash_ctx(&s->write_hash);
575 }
576 
577 int SSL_clear(SSL *s)
578 {
579     if (s->method == NULL) {
580         SSLerr(SSL_F_SSL_CLEAR, SSL_R_NO_METHOD_SPECIFIED);
581         return 0;
582     }
583 
584     if (ssl_clear_bad_session(s)) {
585         SSL_SESSION_free(s->session);
586         s->session = NULL;
587     }
588     SSL_SESSION_free(s->psksession);
589     s->psksession = NULL;
590     OPENSSL_free(s->psksession_id);
591     s->psksession_id = NULL;
592     s->psksession_id_len = 0;
593     s->hello_retry_request = 0;
594     s->sent_tickets = 0;
595 
596     s->error = 0;
597     s->hit = 0;
598     s->shutdown = 0;
599 
600     if (s->renegotiate) {
601         SSLerr(SSL_F_SSL_CLEAR, ERR_R_INTERNAL_ERROR);
602         return 0;
603     }
604 
605     ossl_statem_clear(s);
606 
607     s->version = s->method->version;
608     s->client_version = s->version;
609     s->rwstate = SSL_NOTHING;
610 
611     BUF_MEM_free(s->init_buf);
612     s->init_buf = NULL;
613     clear_ciphers(s);
614     s->first_packet = 0;
615 
616     s->key_update = SSL_KEY_UPDATE_NONE;
617 
618     EVP_MD_CTX_free(s->pha_dgst);
619     s->pha_dgst = NULL;
620 
621     /* Reset DANE verification result state */
622     s->dane.mdpth = -1;
623     s->dane.pdpth = -1;
624     X509_free(s->dane.mcert);
625     s->dane.mcert = NULL;
626     s->dane.mtlsa = NULL;
627 
628     /* Clear the verification result peername */
629     X509_VERIFY_PARAM_move_peername(s->param, NULL);
630 
631     /*
632      * Check to see if we were changed into a different method, if so, revert
633      * back.
634      */
635     if (s->method != s->ctx->method) {
636         s->method->ssl_free(s);
637         s->method = s->ctx->method;
638         if (!s->method->ssl_new(s))
639             return 0;
640     } else {
641         if (!s->method->ssl_clear(s))
642             return 0;
643     }
644 
645     RECORD_LAYER_clear(&s->rlayer);
646 
647     return 1;
648 }
649 
650 /** Used to change an SSL_CTXs default SSL method type */
651 int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
652 {
653     STACK_OF(SSL_CIPHER) *sk;
654 
655     ctx->method = meth;
656 
657     if (!SSL_CTX_set_ciphersuites(ctx, TLS_DEFAULT_CIPHERSUITES)) {
658         SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION, SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
659         return 0;
660     }
661     sk = ssl_create_cipher_list(ctx->method,
662                                 ctx->tls13_ciphersuites,
663                                 &(ctx->cipher_list),
664                                 &(ctx->cipher_list_by_id),
665                                 SSL_DEFAULT_CIPHER_LIST, ctx->cert);
666     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0)) {
667         SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION, SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
668         return 0;
669     }
670     return 1;
671 }
672 
673 SSL *SSL_new(SSL_CTX *ctx)
674 {
675     SSL *s;
676 
677     if (ctx == NULL) {
678         SSLerr(SSL_F_SSL_NEW, SSL_R_NULL_SSL_CTX);
679         return NULL;
680     }
681     if (ctx->method == NULL) {
682         SSLerr(SSL_F_SSL_NEW, SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
683         return NULL;
684     }
685 
686     s = OPENSSL_zalloc(sizeof(*s));
687     if (s == NULL)
688         goto err;
689 
690     s->references = 1;
691     s->lock = CRYPTO_THREAD_lock_new();
692     if (s->lock == NULL) {
693         OPENSSL_free(s);
694         s = NULL;
695         goto err;
696     }
697 
698     RECORD_LAYER_init(&s->rlayer, s);
699 
700     s->options = ctx->options;
701     s->dane.flags = ctx->dane.flags;
702     s->min_proto_version = ctx->min_proto_version;
703     s->max_proto_version = ctx->max_proto_version;
704     s->mode = ctx->mode;
705     s->max_cert_list = ctx->max_cert_list;
706     s->max_early_data = ctx->max_early_data;
707     s->recv_max_early_data = ctx->recv_max_early_data;
708     s->num_tickets = ctx->num_tickets;
709     s->pha_enabled = ctx->pha_enabled;
710 
711     /* Shallow copy of the ciphersuites stack */
712     s->tls13_ciphersuites = sk_SSL_CIPHER_dup(ctx->tls13_ciphersuites);
713     if (s->tls13_ciphersuites == NULL)
714         goto err;
715 
716     /*
717      * Earlier library versions used to copy the pointer to the CERT, not
718      * its contents; only when setting new parameters for the per-SSL
719      * copy, ssl_cert_new would be called (and the direct reference to
720      * the per-SSL_CTX settings would be lost, but those still were
721      * indirectly accessed for various purposes, and for that reason they
722      * used to be known as s->ctx->default_cert). Now we don't look at the
723      * SSL_CTX's CERT after having duplicated it once.
724      */
725     s->cert = ssl_cert_dup(ctx->cert);
726     if (s->cert == NULL)
727         goto err;
728 
729     RECORD_LAYER_set_read_ahead(&s->rlayer, ctx->read_ahead);
730     s->msg_callback = ctx->msg_callback;
731     s->msg_callback_arg = ctx->msg_callback_arg;
732     s->verify_mode = ctx->verify_mode;
733     s->not_resumable_session_cb = ctx->not_resumable_session_cb;
734     s->record_padding_cb = ctx->record_padding_cb;
735     s->record_padding_arg = ctx->record_padding_arg;
736     s->block_padding = ctx->block_padding;
737     s->sid_ctx_length = ctx->sid_ctx_length;
738     if (!ossl_assert(s->sid_ctx_length <= sizeof(s->sid_ctx)))
739         goto err;
740     memcpy(&s->sid_ctx, &ctx->sid_ctx, sizeof(s->sid_ctx));
741     s->verify_callback = ctx->default_verify_callback;
742     s->generate_session_id = ctx->generate_session_id;
743 
744     s->param = X509_VERIFY_PARAM_new();
745     if (s->param == NULL)
746         goto err;
747     X509_VERIFY_PARAM_inherit(s->param, ctx->param);
748     s->quiet_shutdown = ctx->quiet_shutdown;
749 
750     s->ext.max_fragment_len_mode = ctx->ext.max_fragment_len_mode;
751     s->max_send_fragment = ctx->max_send_fragment;
752     s->split_send_fragment = ctx->split_send_fragment;
753     s->max_pipelines = ctx->max_pipelines;
754     if (s->max_pipelines > 1)
755         RECORD_LAYER_set_read_ahead(&s->rlayer, 1);
756     if (ctx->default_read_buf_len > 0)
757         SSL_set_default_read_buffer_len(s, ctx->default_read_buf_len);
758 
759     SSL_CTX_up_ref(ctx);
760     s->ctx = ctx;
761     s->ext.debug_cb = 0;
762     s->ext.debug_arg = NULL;
763     s->ext.ticket_expected = 0;
764     s->ext.status_type = ctx->ext.status_type;
765     s->ext.status_expected = 0;
766     s->ext.ocsp.ids = NULL;
767     s->ext.ocsp.exts = NULL;
768     s->ext.ocsp.resp = NULL;
769     s->ext.ocsp.resp_len = 0;
770     SSL_CTX_up_ref(ctx);
771     s->session_ctx = ctx;
772 #ifndef OPENSSL_NO_EC
773     if (ctx->ext.ecpointformats) {
774         s->ext.ecpointformats =
775             OPENSSL_memdup(ctx->ext.ecpointformats,
776                            ctx->ext.ecpointformats_len);
777         if (!s->ext.ecpointformats)
778             goto err;
779         s->ext.ecpointformats_len =
780             ctx->ext.ecpointformats_len;
781     }
782     if (ctx->ext.supportedgroups) {
783         s->ext.supportedgroups =
784             OPENSSL_memdup(ctx->ext.supportedgroups,
785                            ctx->ext.supportedgroups_len
786                                 * sizeof(*ctx->ext.supportedgroups));
787         if (!s->ext.supportedgroups)
788             goto err;
789         s->ext.supportedgroups_len = ctx->ext.supportedgroups_len;
790     }
791 #endif
792 #ifndef OPENSSL_NO_NEXTPROTONEG
793     s->ext.npn = NULL;
794 #endif
795 
796     if (s->ctx->ext.alpn) {
797         s->ext.alpn = OPENSSL_malloc(s->ctx->ext.alpn_len);
798         if (s->ext.alpn == NULL)
799             goto err;
800         memcpy(s->ext.alpn, s->ctx->ext.alpn, s->ctx->ext.alpn_len);
801         s->ext.alpn_len = s->ctx->ext.alpn_len;
802     }
803 
804     s->verified_chain = NULL;
805     s->verify_result = X509_V_OK;
806 
807     s->default_passwd_callback = ctx->default_passwd_callback;
808     s->default_passwd_callback_userdata = ctx->default_passwd_callback_userdata;
809 
810     s->method = ctx->method;
811 
812     s->key_update = SSL_KEY_UPDATE_NONE;
813 
814     s->allow_early_data_cb = ctx->allow_early_data_cb;
815     s->allow_early_data_cb_data = ctx->allow_early_data_cb_data;
816 
817     if (!s->method->ssl_new(s))
818         goto err;
819 
820     s->server = (ctx->method->ssl_accept == ssl_undefined_function) ? 0 : 1;
821 
822     if (!SSL_clear(s))
823         goto err;
824 
825     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data))
826         goto err;
827 
828 #ifndef OPENSSL_NO_PSK
829     s->psk_client_callback = ctx->psk_client_callback;
830     s->psk_server_callback = ctx->psk_server_callback;
831 #endif
832     s->psk_find_session_cb = ctx->psk_find_session_cb;
833     s->psk_use_session_cb = ctx->psk_use_session_cb;
834 
835     s->job = NULL;
836 
837 #ifndef OPENSSL_NO_CT
838     if (!SSL_set_ct_validation_callback(s, ctx->ct_validation_callback,
839                                         ctx->ct_validation_callback_arg))
840         goto err;
841 #endif
842 
843     return s;
844  err:
845     SSL_free(s);
846     SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
847     return NULL;
848 }
849 
850 int SSL_is_dtls(const SSL *s)
851 {
852     return SSL_IS_DTLS(s) ? 1 : 0;
853 }
854 
855 int SSL_up_ref(SSL *s)
856 {
857     int i;
858 
859     if (CRYPTO_UP_REF(&s->references, &i, s->lock) <= 0)
860         return 0;
861 
862     REF_PRINT_COUNT("SSL", s);
863     REF_ASSERT_ISNT(i < 2);
864     return ((i > 1) ? 1 : 0);
865 }
866 
867 int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
868                                    unsigned int sid_ctx_len)
869 {
870     if (sid_ctx_len > sizeof(ctx->sid_ctx)) {
871         SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,
872                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
873         return 0;
874     }
875     ctx->sid_ctx_length = sid_ctx_len;
876     memcpy(ctx->sid_ctx, sid_ctx, sid_ctx_len);
877 
878     return 1;
879 }
880 
881 int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
882                                unsigned int sid_ctx_len)
883 {
884     if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
885         SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,
886                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
887         return 0;
888     }
889     ssl->sid_ctx_length = sid_ctx_len;
890     memcpy(ssl->sid_ctx, sid_ctx, sid_ctx_len);
891 
892     return 1;
893 }
894 
895 int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
896 {
897     CRYPTO_THREAD_write_lock(ctx->lock);
898     ctx->generate_session_id = cb;
899     CRYPTO_THREAD_unlock(ctx->lock);
900     return 1;
901 }
902 
903 int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
904 {
905     CRYPTO_THREAD_write_lock(ssl->lock);
906     ssl->generate_session_id = cb;
907     CRYPTO_THREAD_unlock(ssl->lock);
908     return 1;
909 }
910 
911 int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
912                                 unsigned int id_len)
913 {
914     /*
915      * A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
916      * we can "construct" a session to give us the desired check - i.e. to
917      * find if there's a session in the hash table that would conflict with
918      * any new session built out of this id/id_len and the ssl_version in use
919      * by this SSL.
920      */
921     SSL_SESSION r, *p;
922 
923     if (id_len > sizeof(r.session_id))
924         return 0;
925 
926     r.ssl_version = ssl->version;
927     r.session_id_length = id_len;
928     memcpy(r.session_id, id, id_len);
929 
930     CRYPTO_THREAD_read_lock(ssl->session_ctx->lock);
931     p = lh_SSL_SESSION_retrieve(ssl->session_ctx->sessions, &r);
932     CRYPTO_THREAD_unlock(ssl->session_ctx->lock);
933     return (p != NULL);
934 }
935 
936 int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
937 {
938     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
939 }
940 
941 int SSL_set_purpose(SSL *s, int purpose)
942 {
943     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
944 }
945 
946 int SSL_CTX_set_trust(SSL_CTX *s, int trust)
947 {
948     return X509_VERIFY_PARAM_set_trust(s->param, trust);
949 }
950 
951 int SSL_set_trust(SSL *s, int trust)
952 {
953     return X509_VERIFY_PARAM_set_trust(s->param, trust);
954 }
955 
956 int SSL_set1_host(SSL *s, const char *hostname)
957 {
958     return X509_VERIFY_PARAM_set1_host(s->param, hostname, 0);
959 }
960 
961 int SSL_add1_host(SSL *s, const char *hostname)
962 {
963     return X509_VERIFY_PARAM_add1_host(s->param, hostname, 0);
964 }
965 
966 void SSL_set_hostflags(SSL *s, unsigned int flags)
967 {
968     X509_VERIFY_PARAM_set_hostflags(s->param, flags);
969 }
970 
971 const char *SSL_get0_peername(SSL *s)
972 {
973     return X509_VERIFY_PARAM_get0_peername(s->param);
974 }
975 
976 int SSL_CTX_dane_enable(SSL_CTX *ctx)
977 {
978     return dane_ctx_enable(&ctx->dane);
979 }
980 
981 unsigned long SSL_CTX_dane_set_flags(SSL_CTX *ctx, unsigned long flags)
982 {
983     unsigned long orig = ctx->dane.flags;
984 
985     ctx->dane.flags |= flags;
986     return orig;
987 }
988 
989 unsigned long SSL_CTX_dane_clear_flags(SSL_CTX *ctx, unsigned long flags)
990 {
991     unsigned long orig = ctx->dane.flags;
992 
993     ctx->dane.flags &= ~flags;
994     return orig;
995 }
996 
997 int SSL_dane_enable(SSL *s, const char *basedomain)
998 {
999     SSL_DANE *dane = &s->dane;
1000 
1001     if (s->ctx->dane.mdmax == 0) {
1002         SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_CONTEXT_NOT_DANE_ENABLED);
1003         return 0;
1004     }
1005     if (dane->trecs != NULL) {
1006         SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_DANE_ALREADY_ENABLED);
1007         return 0;
1008     }
1009 
1010     /*
1011      * Default SNI name.  This rejects empty names, while set1_host below
1012      * accepts them and disables host name checks.  To avoid side-effects with
1013      * invalid input, set the SNI name first.
1014      */
1015     if (s->ext.hostname == NULL) {
1016         if (!SSL_set_tlsext_host_name(s, basedomain)) {
1017             SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN);
1018             return -1;
1019         }
1020     }
1021 
1022     /* Primary RFC6125 reference identifier */
1023     if (!X509_VERIFY_PARAM_set1_host(s->param, basedomain, 0)) {
1024         SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN);
1025         return -1;
1026     }
1027 
1028     dane->mdpth = -1;
1029     dane->pdpth = -1;
1030     dane->dctx = &s->ctx->dane;
1031     dane->trecs = sk_danetls_record_new_null();
1032 
1033     if (dane->trecs == NULL) {
1034         SSLerr(SSL_F_SSL_DANE_ENABLE, ERR_R_MALLOC_FAILURE);
1035         return -1;
1036     }
1037     return 1;
1038 }
1039 
1040 unsigned long SSL_dane_set_flags(SSL *ssl, unsigned long flags)
1041 {
1042     unsigned long orig = ssl->dane.flags;
1043 
1044     ssl->dane.flags |= flags;
1045     return orig;
1046 }
1047 
1048 unsigned long SSL_dane_clear_flags(SSL *ssl, unsigned long flags)
1049 {
1050     unsigned long orig = ssl->dane.flags;
1051 
1052     ssl->dane.flags &= ~flags;
1053     return orig;
1054 }
1055 
1056 int SSL_get0_dane_authority(SSL *s, X509 **mcert, EVP_PKEY **mspki)
1057 {
1058     SSL_DANE *dane = &s->dane;
1059 
1060     if (!DANETLS_ENABLED(dane) || s->verify_result != X509_V_OK)
1061         return -1;
1062     if (dane->mtlsa) {
1063         if (mcert)
1064             *mcert = dane->mcert;
1065         if (mspki)
1066             *mspki = (dane->mcert == NULL) ? dane->mtlsa->spki : NULL;
1067     }
1068     return dane->mdpth;
1069 }
1070 
1071 int SSL_get0_dane_tlsa(SSL *s, uint8_t *usage, uint8_t *selector,
1072                        uint8_t *mtype, unsigned const char **data, size_t *dlen)
1073 {
1074     SSL_DANE *dane = &s->dane;
1075 
1076     if (!DANETLS_ENABLED(dane) || s->verify_result != X509_V_OK)
1077         return -1;
1078     if (dane->mtlsa) {
1079         if (usage)
1080             *usage = dane->mtlsa->usage;
1081         if (selector)
1082             *selector = dane->mtlsa->selector;
1083         if (mtype)
1084             *mtype = dane->mtlsa->mtype;
1085         if (data)
1086             *data = dane->mtlsa->data;
1087         if (dlen)
1088             *dlen = dane->mtlsa->dlen;
1089     }
1090     return dane->mdpth;
1091 }
1092 
1093 SSL_DANE *SSL_get0_dane(SSL *s)
1094 {
1095     return &s->dane;
1096 }
1097 
1098 int SSL_dane_tlsa_add(SSL *s, uint8_t usage, uint8_t selector,
1099                       uint8_t mtype, unsigned const char *data, size_t dlen)
1100 {
1101     return dane_tlsa_add(&s->dane, usage, selector, mtype, data, dlen);
1102 }
1103 
1104 int SSL_CTX_dane_mtype_set(SSL_CTX *ctx, const EVP_MD *md, uint8_t mtype,
1105                            uint8_t ord)
1106 {
1107     return dane_mtype_set(&ctx->dane, md, mtype, ord);
1108 }
1109 
1110 int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
1111 {
1112     return X509_VERIFY_PARAM_set1(ctx->param, vpm);
1113 }
1114 
1115 int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
1116 {
1117     return X509_VERIFY_PARAM_set1(ssl->param, vpm);
1118 }
1119 
1120 X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
1121 {
1122     return ctx->param;
1123 }
1124 
1125 X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
1126 {
1127     return ssl->param;
1128 }
1129 
1130 void SSL_certs_clear(SSL *s)
1131 {
1132     ssl_cert_clear_certs(s->cert);
1133 }
1134 
1135 void SSL_free(SSL *s)
1136 {
1137     int i;
1138 
1139     if (s == NULL)
1140         return;
1141     CRYPTO_DOWN_REF(&s->references, &i, s->lock);
1142     REF_PRINT_COUNT("SSL", s);
1143     if (i > 0)
1144         return;
1145     REF_ASSERT_ISNT(i < 0);
1146 
1147     X509_VERIFY_PARAM_free(s->param);
1148     dane_final(&s->dane);
1149     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
1150 
1151     /* Ignore return value */
1152     ssl_free_wbio_buffer(s);
1153 
1154     BIO_free_all(s->wbio);
1155     BIO_free_all(s->rbio);
1156 
1157     BUF_MEM_free(s->init_buf);
1158 
1159     /* add extra stuff */
1160     sk_SSL_CIPHER_free(s->cipher_list);
1161     sk_SSL_CIPHER_free(s->cipher_list_by_id);
1162     sk_SSL_CIPHER_free(s->tls13_ciphersuites);
1163 
1164     /* Make the next call work :-) */
1165     if (s->session != NULL) {
1166         ssl_clear_bad_session(s);
1167         SSL_SESSION_free(s->session);
1168     }
1169     SSL_SESSION_free(s->psksession);
1170     OPENSSL_free(s->psksession_id);
1171 
1172     clear_ciphers(s);
1173 
1174     ssl_cert_free(s->cert);
1175     /* Free up if allocated */
1176 
1177     OPENSSL_free(s->ext.hostname);
1178     SSL_CTX_free(s->session_ctx);
1179 #ifndef OPENSSL_NO_EC
1180     OPENSSL_free(s->ext.ecpointformats);
1181     OPENSSL_free(s->ext.supportedgroups);
1182 #endif                          /* OPENSSL_NO_EC */
1183     sk_X509_EXTENSION_pop_free(s->ext.ocsp.exts, X509_EXTENSION_free);
1184 #ifndef OPENSSL_NO_OCSP
1185     sk_OCSP_RESPID_pop_free(s->ext.ocsp.ids, OCSP_RESPID_free);
1186 #endif
1187 #ifndef OPENSSL_NO_CT
1188     SCT_LIST_free(s->scts);
1189     OPENSSL_free(s->ext.scts);
1190 #endif
1191     OPENSSL_free(s->ext.ocsp.resp);
1192     OPENSSL_free(s->ext.alpn);
1193     OPENSSL_free(s->ext.tls13_cookie);
1194     OPENSSL_free(s->clienthello);
1195     OPENSSL_free(s->pha_context);
1196     EVP_MD_CTX_free(s->pha_dgst);
1197 
1198     sk_X509_NAME_pop_free(s->ca_names, X509_NAME_free);
1199     sk_X509_NAME_pop_free(s->client_ca_names, X509_NAME_free);
1200 
1201     sk_X509_pop_free(s->verified_chain, X509_free);
1202 
1203     if (s->method != NULL)
1204         s->method->ssl_free(s);
1205 
1206     RECORD_LAYER_release(&s->rlayer);
1207 
1208     SSL_CTX_free(s->ctx);
1209 
1210     ASYNC_WAIT_CTX_free(s->waitctx);
1211 
1212 #if !defined(OPENSSL_NO_NEXTPROTONEG)
1213     OPENSSL_free(s->ext.npn);
1214 #endif
1215 
1216 #ifndef OPENSSL_NO_SRTP
1217     sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);
1218 #endif
1219 
1220     CRYPTO_THREAD_lock_free(s->lock);
1221 
1222     OPENSSL_free(s);
1223 }
1224 
1225 void SSL_set0_rbio(SSL *s, BIO *rbio)
1226 {
1227     BIO_free_all(s->rbio);
1228     s->rbio = rbio;
1229 }
1230 
1231 void SSL_set0_wbio(SSL *s, BIO *wbio)
1232 {
1233     /*
1234      * If the output buffering BIO is still in place, remove it
1235      */
1236     if (s->bbio != NULL)
1237         s->wbio = BIO_pop(s->wbio);
1238 
1239     BIO_free_all(s->wbio);
1240     s->wbio = wbio;
1241 
1242     /* Re-attach |bbio| to the new |wbio|. */
1243     if (s->bbio != NULL)
1244         s->wbio = BIO_push(s->bbio, s->wbio);
1245 }
1246 
1247 void SSL_set_bio(SSL *s, BIO *rbio, BIO *wbio)
1248 {
1249     /*
1250      * For historical reasons, this function has many different cases in
1251      * ownership handling.
1252      */
1253 
1254     /* If nothing has changed, do nothing */
1255     if (rbio == SSL_get_rbio(s) && wbio == SSL_get_wbio(s))
1256         return;
1257 
1258     /*
1259      * If the two arguments are equal then one fewer reference is granted by the
1260      * caller than we want to take
1261      */
1262     if (rbio != NULL && rbio == wbio)
1263         BIO_up_ref(rbio);
1264 
1265     /*
1266      * If only the wbio is changed only adopt one reference.
1267      */
1268     if (rbio == SSL_get_rbio(s)) {
1269         SSL_set0_wbio(s, wbio);
1270         return;
1271     }
1272     /*
1273      * There is an asymmetry here for historical reasons. If only the rbio is
1274      * changed AND the rbio and wbio were originally different, then we only
1275      * adopt one reference.
1276      */
1277     if (wbio == SSL_get_wbio(s) && SSL_get_rbio(s) != SSL_get_wbio(s)) {
1278         SSL_set0_rbio(s, rbio);
1279         return;
1280     }
1281 
1282     /* Otherwise, adopt both references. */
1283     SSL_set0_rbio(s, rbio);
1284     SSL_set0_wbio(s, wbio);
1285 }
1286 
1287 BIO *SSL_get_rbio(const SSL *s)
1288 {
1289     return s->rbio;
1290 }
1291 
1292 BIO *SSL_get_wbio(const SSL *s)
1293 {
1294     if (s->bbio != NULL) {
1295         /*
1296          * If |bbio| is active, the true caller-configured BIO is its
1297          * |next_bio|.
1298          */
1299         return BIO_next(s->bbio);
1300     }
1301     return s->wbio;
1302 }
1303 
1304 int SSL_get_fd(const SSL *s)
1305 {
1306     return SSL_get_rfd(s);
1307 }
1308 
1309 int SSL_get_rfd(const SSL *s)
1310 {
1311     int ret = -1;
1312     BIO *b, *r;
1313 
1314     b = SSL_get_rbio(s);
1315     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
1316     if (r != NULL)
1317         BIO_get_fd(r, &ret);
1318     return ret;
1319 }
1320 
1321 int SSL_get_wfd(const SSL *s)
1322 {
1323     int ret = -1;
1324     BIO *b, *r;
1325 
1326     b = SSL_get_wbio(s);
1327     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
1328     if (r != NULL)
1329         BIO_get_fd(r, &ret);
1330     return ret;
1331 }
1332 
1333 #ifndef OPENSSL_NO_SOCK
1334 int SSL_set_fd(SSL *s, int fd)
1335 {
1336     int ret = 0;
1337     BIO *bio = NULL;
1338 
1339     bio = BIO_new(BIO_s_socket());
1340 
1341     if (bio == NULL) {
1342         SSLerr(SSL_F_SSL_SET_FD, ERR_R_BUF_LIB);
1343         goto err;
1344     }
1345     BIO_set_fd(bio, fd, BIO_NOCLOSE);
1346     SSL_set_bio(s, bio, bio);
1347     ret = 1;
1348  err:
1349     return ret;
1350 }
1351 
1352 int SSL_set_wfd(SSL *s, int fd)
1353 {
1354     BIO *rbio = SSL_get_rbio(s);
1355 
1356     if (rbio == NULL || BIO_method_type(rbio) != BIO_TYPE_SOCKET
1357         || (int)BIO_get_fd(rbio, NULL) != fd) {
1358         BIO *bio = BIO_new(BIO_s_socket());
1359 
1360         if (bio == NULL) {
1361             SSLerr(SSL_F_SSL_SET_WFD, ERR_R_BUF_LIB);
1362             return 0;
1363         }
1364         BIO_set_fd(bio, fd, BIO_NOCLOSE);
1365         SSL_set0_wbio(s, bio);
1366     } else {
1367         BIO_up_ref(rbio);
1368         SSL_set0_wbio(s, rbio);
1369     }
1370     return 1;
1371 }
1372 
1373 int SSL_set_rfd(SSL *s, int fd)
1374 {
1375     BIO *wbio = SSL_get_wbio(s);
1376 
1377     if (wbio == NULL || BIO_method_type(wbio) != BIO_TYPE_SOCKET
1378         || ((int)BIO_get_fd(wbio, NULL) != fd)) {
1379         BIO *bio = BIO_new(BIO_s_socket());
1380 
1381         if (bio == NULL) {
1382             SSLerr(SSL_F_SSL_SET_RFD, ERR_R_BUF_LIB);
1383             return 0;
1384         }
1385         BIO_set_fd(bio, fd, BIO_NOCLOSE);
1386         SSL_set0_rbio(s, bio);
1387     } else {
1388         BIO_up_ref(wbio);
1389         SSL_set0_rbio(s, wbio);
1390     }
1391 
1392     return 1;
1393 }
1394 #endif
1395 
1396 /* return length of latest Finished message we sent, copy to 'buf' */
1397 size_t SSL_get_finished(const SSL *s, void *buf, size_t count)
1398 {
1399     size_t ret = 0;
1400 
1401     if (s->s3 != NULL) {
1402         ret = s->s3->tmp.finish_md_len;
1403         if (count > ret)
1404             count = ret;
1405         memcpy(buf, s->s3->tmp.finish_md, count);
1406     }
1407     return ret;
1408 }
1409 
1410 /* return length of latest Finished message we expected, copy to 'buf' */
1411 size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count)
1412 {
1413     size_t ret = 0;
1414 
1415     if (s->s3 != NULL) {
1416         ret = s->s3->tmp.peer_finish_md_len;
1417         if (count > ret)
1418             count = ret;
1419         memcpy(buf, s->s3->tmp.peer_finish_md, count);
1420     }
1421     return ret;
1422 }
1423 
1424 int SSL_get_verify_mode(const SSL *s)
1425 {
1426     return s->verify_mode;
1427 }
1428 
1429 int SSL_get_verify_depth(const SSL *s)
1430 {
1431     return X509_VERIFY_PARAM_get_depth(s->param);
1432 }
1433 
1434 int (*SSL_get_verify_callback(const SSL *s)) (int, X509_STORE_CTX *) {
1435     return s->verify_callback;
1436 }
1437 
1438 int SSL_CTX_get_verify_mode(const SSL_CTX *ctx)
1439 {
1440     return ctx->verify_mode;
1441 }
1442 
1443 int SSL_CTX_get_verify_depth(const SSL_CTX *ctx)
1444 {
1445     return X509_VERIFY_PARAM_get_depth(ctx->param);
1446 }
1447 
1448 int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx)) (int, X509_STORE_CTX *) {
1449     return ctx->default_verify_callback;
1450 }
1451 
1452 void SSL_set_verify(SSL *s, int mode,
1453                     int (*callback) (int ok, X509_STORE_CTX *ctx))
1454 {
1455     s->verify_mode = mode;
1456     if (callback != NULL)
1457         s->verify_callback = callback;
1458 }
1459 
1460 void SSL_set_verify_depth(SSL *s, int depth)
1461 {
1462     X509_VERIFY_PARAM_set_depth(s->param, depth);
1463 }
1464 
1465 void SSL_set_read_ahead(SSL *s, int yes)
1466 {
1467     RECORD_LAYER_set_read_ahead(&s->rlayer, yes);
1468 }
1469 
1470 int SSL_get_read_ahead(const SSL *s)
1471 {
1472     return RECORD_LAYER_get_read_ahead(&s->rlayer);
1473 }
1474 
1475 int SSL_pending(const SSL *s)
1476 {
1477     size_t pending = s->method->ssl_pending(s);
1478 
1479     /*
1480      * SSL_pending cannot work properly if read-ahead is enabled
1481      * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)), and it is
1482      * impossible to fix since SSL_pending cannot report errors that may be
1483      * observed while scanning the new data. (Note that SSL_pending() is
1484      * often used as a boolean value, so we'd better not return -1.)
1485      *
1486      * SSL_pending also cannot work properly if the value >INT_MAX. In that case
1487      * we just return INT_MAX.
1488      */
1489     return pending < INT_MAX ? (int)pending : INT_MAX;
1490 }
1491 
1492 int SSL_has_pending(const SSL *s)
1493 {
1494     /*
1495      * Similar to SSL_pending() but returns a 1 to indicate that we have
1496      * unprocessed data available or 0 otherwise (as opposed to the number of
1497      * bytes available). Unlike SSL_pending() this will take into account
1498      * read_ahead data. A 1 return simply indicates that we have unprocessed
1499      * data. That data may not result in any application data, or we may fail
1500      * to parse the records for some reason.
1501      */
1502     if (RECORD_LAYER_processed_read_pending(&s->rlayer))
1503         return 1;
1504 
1505     return RECORD_LAYER_read_pending(&s->rlayer);
1506 }
1507 
1508 X509 *SSL_get_peer_certificate(const SSL *s)
1509 {
1510     X509 *r;
1511 
1512     if ((s == NULL) || (s->session == NULL))
1513         r = NULL;
1514     else
1515         r = s->session->peer;
1516 
1517     if (r == NULL)
1518         return r;
1519 
1520     X509_up_ref(r);
1521 
1522     return r;
1523 }
1524 
1525 STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s)
1526 {
1527     STACK_OF(X509) *r;
1528 
1529     if ((s == NULL) || (s->session == NULL))
1530         r = NULL;
1531     else
1532         r = s->session->peer_chain;
1533 
1534     /*
1535      * If we are a client, cert_chain includes the peer's own certificate; if
1536      * we are a server, it does not.
1537      */
1538 
1539     return r;
1540 }
1541 
1542 /*
1543  * Now in theory, since the calling process own 't' it should be safe to
1544  * modify.  We need to be able to read f without being hassled
1545  */
1546 int SSL_copy_session_id(SSL *t, const SSL *f)
1547 {
1548     int i;
1549     /* Do we need to to SSL locking? */
1550     if (!SSL_set_session(t, SSL_get_session(f))) {
1551         return 0;
1552     }
1553 
1554     /*
1555      * what if we are setup for one protocol version but want to talk another
1556      */
1557     if (t->method != f->method) {
1558         t->method->ssl_free(t);
1559         t->method = f->method;
1560         if (t->method->ssl_new(t) == 0)
1561             return 0;
1562     }
1563 
1564     CRYPTO_UP_REF(&f->cert->references, &i, f->cert->lock);
1565     ssl_cert_free(t->cert);
1566     t->cert = f->cert;
1567     if (!SSL_set_session_id_context(t, f->sid_ctx, (int)f->sid_ctx_length)) {
1568         return 0;
1569     }
1570 
1571     return 1;
1572 }
1573 
1574 /* Fix this so it checks all the valid key/cert options */
1575 int SSL_CTX_check_private_key(const SSL_CTX *ctx)
1576 {
1577     if ((ctx == NULL) || (ctx->cert->key->x509 == NULL)) {
1578         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
1579         return 0;
1580     }
1581     if (ctx->cert->key->privatekey == NULL) {
1582         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
1583         return 0;
1584     }
1585     return X509_check_private_key
1586             (ctx->cert->key->x509, ctx->cert->key->privatekey);
1587 }
1588 
1589 /* Fix this function so that it takes an optional type parameter */
1590 int SSL_check_private_key(const SSL *ssl)
1591 {
1592     if (ssl == NULL) {
1593         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
1594         return 0;
1595     }
1596     if (ssl->cert->key->x509 == NULL) {
1597         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
1598         return 0;
1599     }
1600     if (ssl->cert->key->privatekey == NULL) {
1601         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
1602         return 0;
1603     }
1604     return X509_check_private_key(ssl->cert->key->x509,
1605                                    ssl->cert->key->privatekey);
1606 }
1607 
1608 int SSL_waiting_for_async(SSL *s)
1609 {
1610     if (s->job)
1611         return 1;
1612 
1613     return 0;
1614 }
1615 
1616 int SSL_get_all_async_fds(SSL *s, OSSL_ASYNC_FD *fds, size_t *numfds)
1617 {
1618     ASYNC_WAIT_CTX *ctx = s->waitctx;
1619 
1620     if (ctx == NULL)
1621         return 0;
1622     return ASYNC_WAIT_CTX_get_all_fds(ctx, fds, numfds);
1623 }
1624 
1625 int SSL_get_changed_async_fds(SSL *s, OSSL_ASYNC_FD *addfd, size_t *numaddfds,
1626                               OSSL_ASYNC_FD *delfd, size_t *numdelfds)
1627 {
1628     ASYNC_WAIT_CTX *ctx = s->waitctx;
1629 
1630     if (ctx == NULL)
1631         return 0;
1632     return ASYNC_WAIT_CTX_get_changed_fds(ctx, addfd, numaddfds, delfd,
1633                                           numdelfds);
1634 }
1635 
1636 int SSL_accept(SSL *s)
1637 {
1638     if (s->handshake_func == NULL) {
1639         /* Not properly initialized yet */
1640         SSL_set_accept_state(s);
1641     }
1642 
1643     return SSL_do_handshake(s);
1644 }
1645 
1646 int SSL_connect(SSL *s)
1647 {
1648     if (s->handshake_func == NULL) {
1649         /* Not properly initialized yet */
1650         SSL_set_connect_state(s);
1651     }
1652 
1653     return SSL_do_handshake(s);
1654 }
1655 
1656 long SSL_get_default_timeout(const SSL *s)
1657 {
1658     return s->method->get_timeout();
1659 }
1660 
1661 static int ssl_start_async_job(SSL *s, struct ssl_async_args *args,
1662                                int (*func) (void *))
1663 {
1664     int ret;
1665     if (s->waitctx == NULL) {
1666         s->waitctx = ASYNC_WAIT_CTX_new();
1667         if (s->waitctx == NULL)
1668             return -1;
1669     }
1670     switch (ASYNC_start_job(&s->job, s->waitctx, &ret, func, args,
1671                             sizeof(struct ssl_async_args))) {
1672     case ASYNC_ERR:
1673         s->rwstate = SSL_NOTHING;
1674         SSLerr(SSL_F_SSL_START_ASYNC_JOB, SSL_R_FAILED_TO_INIT_ASYNC);
1675         return -1;
1676     case ASYNC_PAUSE:
1677         s->rwstate = SSL_ASYNC_PAUSED;
1678         return -1;
1679     case ASYNC_NO_JOBS:
1680         s->rwstate = SSL_ASYNC_NO_JOBS;
1681         return -1;
1682     case ASYNC_FINISH:
1683         s->job = NULL;
1684         return ret;
1685     default:
1686         s->rwstate = SSL_NOTHING;
1687         SSLerr(SSL_F_SSL_START_ASYNC_JOB, ERR_R_INTERNAL_ERROR);
1688         /* Shouldn't happen */
1689         return -1;
1690     }
1691 }
1692 
1693 static int ssl_io_intern(void *vargs)
1694 {
1695     struct ssl_async_args *args;
1696     SSL *s;
1697     void *buf;
1698     size_t num;
1699 
1700     args = (struct ssl_async_args *)vargs;
1701     s = args->s;
1702     buf = args->buf;
1703     num = args->num;
1704     switch (args->type) {
1705     case READFUNC:
1706         return args->f.func_read(s, buf, num, &s->asyncrw);
1707     case WRITEFUNC:
1708         return args->f.func_write(s, buf, num, &s->asyncrw);
1709     case OTHERFUNC:
1710         return args->f.func_other(s);
1711     }
1712     return -1;
1713 }
1714 
1715 int ssl_read_internal(SSL *s, void *buf, size_t num, size_t *readbytes)
1716 {
1717     if (s->handshake_func == NULL) {
1718         SSLerr(SSL_F_SSL_READ_INTERNAL, SSL_R_UNINITIALIZED);
1719         return -1;
1720     }
1721 
1722     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1723         s->rwstate = SSL_NOTHING;
1724         return 0;
1725     }
1726 
1727     if (s->early_data_state == SSL_EARLY_DATA_CONNECT_RETRY
1728                 || s->early_data_state == SSL_EARLY_DATA_ACCEPT_RETRY) {
1729         SSLerr(SSL_F_SSL_READ_INTERNAL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1730         return 0;
1731     }
1732     /*
1733      * If we are a client and haven't received the ServerHello etc then we
1734      * better do that
1735      */
1736     ossl_statem_check_finish_init(s, 0);
1737 
1738     if ((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
1739         struct ssl_async_args args;
1740         int ret;
1741 
1742         args.s = s;
1743         args.buf = buf;
1744         args.num = num;
1745         args.type = READFUNC;
1746         args.f.func_read = s->method->ssl_read;
1747 
1748         ret = ssl_start_async_job(s, &args, ssl_io_intern);
1749         *readbytes = s->asyncrw;
1750         return ret;
1751     } else {
1752         return s->method->ssl_read(s, buf, num, readbytes);
1753     }
1754 }
1755 
1756 int SSL_read(SSL *s, void *buf, int num)
1757 {
1758     int ret;
1759     size_t readbytes;
1760 
1761     if (num < 0) {
1762         SSLerr(SSL_F_SSL_READ, SSL_R_BAD_LENGTH);
1763         return -1;
1764     }
1765 
1766     ret = ssl_read_internal(s, buf, (size_t)num, &readbytes);
1767 
1768     /*
1769      * The cast is safe here because ret should be <= INT_MAX because num is
1770      * <= INT_MAX
1771      */
1772     if (ret > 0)
1773         ret = (int)readbytes;
1774 
1775     return ret;
1776 }
1777 
1778 int SSL_read_ex(SSL *s, void *buf, size_t num, size_t *readbytes)
1779 {
1780     int ret = ssl_read_internal(s, buf, num, readbytes);
1781 
1782     if (ret < 0)
1783         ret = 0;
1784     return ret;
1785 }
1786 
1787 int SSL_read_early_data(SSL *s, void *buf, size_t num, size_t *readbytes)
1788 {
1789     int ret;
1790 
1791     if (!s->server) {
1792         SSLerr(SSL_F_SSL_READ_EARLY_DATA, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1793         return SSL_READ_EARLY_DATA_ERROR;
1794     }
1795 
1796     switch (s->early_data_state) {
1797     case SSL_EARLY_DATA_NONE:
1798         if (!SSL_in_before(s)) {
1799             SSLerr(SSL_F_SSL_READ_EARLY_DATA,
1800                    ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1801             return SSL_READ_EARLY_DATA_ERROR;
1802         }
1803         /* fall through */
1804 
1805     case SSL_EARLY_DATA_ACCEPT_RETRY:
1806         s->early_data_state = SSL_EARLY_DATA_ACCEPTING;
1807         ret = SSL_accept(s);
1808         if (ret <= 0) {
1809             /* NBIO or error */
1810             s->early_data_state = SSL_EARLY_DATA_ACCEPT_RETRY;
1811             return SSL_READ_EARLY_DATA_ERROR;
1812         }
1813         /* fall through */
1814 
1815     case SSL_EARLY_DATA_READ_RETRY:
1816         if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) {
1817             s->early_data_state = SSL_EARLY_DATA_READING;
1818             ret = SSL_read_ex(s, buf, num, readbytes);
1819             /*
1820              * State machine will update early_data_state to
1821              * SSL_EARLY_DATA_FINISHED_READING if we get an EndOfEarlyData
1822              * message
1823              */
1824             if (ret > 0 || (ret <= 0 && s->early_data_state
1825                                         != SSL_EARLY_DATA_FINISHED_READING)) {
1826                 s->early_data_state = SSL_EARLY_DATA_READ_RETRY;
1827                 return ret > 0 ? SSL_READ_EARLY_DATA_SUCCESS
1828                                : SSL_READ_EARLY_DATA_ERROR;
1829             }
1830         } else {
1831             s->early_data_state = SSL_EARLY_DATA_FINISHED_READING;
1832         }
1833         *readbytes = 0;
1834         return SSL_READ_EARLY_DATA_FINISH;
1835 
1836     default:
1837         SSLerr(SSL_F_SSL_READ_EARLY_DATA, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1838         return SSL_READ_EARLY_DATA_ERROR;
1839     }
1840 }
1841 
1842 int SSL_get_early_data_status(const SSL *s)
1843 {
1844     return s->ext.early_data;
1845 }
1846 
1847 static int ssl_peek_internal(SSL *s, void *buf, size_t num, size_t *readbytes)
1848 {
1849     if (s->handshake_func == NULL) {
1850         SSLerr(SSL_F_SSL_PEEK_INTERNAL, SSL_R_UNINITIALIZED);
1851         return -1;
1852     }
1853 
1854     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1855         return 0;
1856     }
1857     if ((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
1858         struct ssl_async_args args;
1859         int ret;
1860 
1861         args.s = s;
1862         args.buf = buf;
1863         args.num = num;
1864         args.type = READFUNC;
1865         args.f.func_read = s->method->ssl_peek;
1866 
1867         ret = ssl_start_async_job(s, &args, ssl_io_intern);
1868         *readbytes = s->asyncrw;
1869         return ret;
1870     } else {
1871         return s->method->ssl_peek(s, buf, num, readbytes);
1872     }
1873 }
1874 
1875 int SSL_peek(SSL *s, void *buf, int num)
1876 {
1877     int ret;
1878     size_t readbytes;
1879 
1880     if (num < 0) {
1881         SSLerr(SSL_F_SSL_PEEK, SSL_R_BAD_LENGTH);
1882         return -1;
1883     }
1884 
1885     ret = ssl_peek_internal(s, buf, (size_t)num, &readbytes);
1886 
1887     /*
1888      * The cast is safe here because ret should be <= INT_MAX because num is
1889      * <= INT_MAX
1890      */
1891     if (ret > 0)
1892         ret = (int)readbytes;
1893 
1894     return ret;
1895 }
1896 
1897 
1898 int SSL_peek_ex(SSL *s, void *buf, size_t num, size_t *readbytes)
1899 {
1900     int ret = ssl_peek_internal(s, buf, num, readbytes);
1901 
1902     if (ret < 0)
1903         ret = 0;
1904     return ret;
1905 }
1906 
1907 int ssl_write_internal(SSL *s, const void *buf, size_t num, size_t *written)
1908 {
1909     if (s->handshake_func == NULL) {
1910         SSLerr(SSL_F_SSL_WRITE_INTERNAL, SSL_R_UNINITIALIZED);
1911         return -1;
1912     }
1913 
1914     if (s->shutdown & SSL_SENT_SHUTDOWN) {
1915         s->rwstate = SSL_NOTHING;
1916         SSLerr(SSL_F_SSL_WRITE_INTERNAL, SSL_R_PROTOCOL_IS_SHUTDOWN);
1917         return -1;
1918     }
1919 
1920     if (s->early_data_state == SSL_EARLY_DATA_CONNECT_RETRY
1921                 || s->early_data_state == SSL_EARLY_DATA_ACCEPT_RETRY
1922                 || s->early_data_state == SSL_EARLY_DATA_READ_RETRY) {
1923         SSLerr(SSL_F_SSL_WRITE_INTERNAL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1924         return 0;
1925     }
1926     /* If we are a client and haven't sent the Finished we better do that */
1927     ossl_statem_check_finish_init(s, 1);
1928 
1929     if ((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
1930         int ret;
1931         struct ssl_async_args args;
1932 
1933         args.s = s;
1934         args.buf = (void *)buf;
1935         args.num = num;
1936         args.type = WRITEFUNC;
1937         args.f.func_write = s->method->ssl_write;
1938 
1939         ret = ssl_start_async_job(s, &args, ssl_io_intern);
1940         *written = s->asyncrw;
1941         return ret;
1942     } else {
1943         return s->method->ssl_write(s, buf, num, written);
1944     }
1945 }
1946 
1947 int SSL_write(SSL *s, const void *buf, int num)
1948 {
1949     int ret;
1950     size_t written;
1951 
1952     if (num < 0) {
1953         SSLerr(SSL_F_SSL_WRITE, SSL_R_BAD_LENGTH);
1954         return -1;
1955     }
1956 
1957     ret = ssl_write_internal(s, buf, (size_t)num, &written);
1958 
1959     /*
1960      * The cast is safe here because ret should be <= INT_MAX because num is
1961      * <= INT_MAX
1962      */
1963     if (ret > 0)
1964         ret = (int)written;
1965 
1966     return ret;
1967 }
1968 
1969 int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written)
1970 {
1971     int ret = ssl_write_internal(s, buf, num, written);
1972 
1973     if (ret < 0)
1974         ret = 0;
1975     return ret;
1976 }
1977 
1978 int SSL_write_early_data(SSL *s, const void *buf, size_t num, size_t *written)
1979 {
1980     int ret, early_data_state;
1981     size_t writtmp;
1982     uint32_t partialwrite;
1983 
1984     switch (s->early_data_state) {
1985     case SSL_EARLY_DATA_NONE:
1986         if (s->server
1987                 || !SSL_in_before(s)
1988                 || ((s->session == NULL || s->session->ext.max_early_data == 0)
1989                      && (s->psk_use_session_cb == NULL))) {
1990             SSLerr(SSL_F_SSL_WRITE_EARLY_DATA,
1991                    ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1992             return 0;
1993         }
1994         /* fall through */
1995 
1996     case SSL_EARLY_DATA_CONNECT_RETRY:
1997         s->early_data_state = SSL_EARLY_DATA_CONNECTING;
1998         ret = SSL_connect(s);
1999         if (ret <= 0) {
2000             /* NBIO or error */
2001             s->early_data_state = SSL_EARLY_DATA_CONNECT_RETRY;
2002             return 0;
2003         }
2004         /* fall through */
2005 
2006     case SSL_EARLY_DATA_WRITE_RETRY:
2007         s->early_data_state = SSL_EARLY_DATA_WRITING;
2008         /*
2009          * We disable partial write for early data because we don't keep track
2010          * of how many bytes we've written between the SSL_write_ex() call and
2011          * the flush if the flush needs to be retried)
2012          */
2013         partialwrite = s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE;
2014         s->mode &= ~SSL_MODE_ENABLE_PARTIAL_WRITE;
2015         ret = SSL_write_ex(s, buf, num, &writtmp);
2016         s->mode |= partialwrite;
2017         if (!ret) {
2018             s->early_data_state = SSL_EARLY_DATA_WRITE_RETRY;
2019             return ret;
2020         }
2021         s->early_data_state = SSL_EARLY_DATA_WRITE_FLUSH;
2022         /* fall through */
2023 
2024     case SSL_EARLY_DATA_WRITE_FLUSH:
2025         /* The buffering BIO is still in place so we need to flush it */
2026         if (statem_flush(s) != 1)
2027             return 0;
2028         *written = num;
2029         s->early_data_state = SSL_EARLY_DATA_WRITE_RETRY;
2030         return 1;
2031 
2032     case SSL_EARLY_DATA_FINISHED_READING:
2033     case SSL_EARLY_DATA_READ_RETRY:
2034         early_data_state = s->early_data_state;
2035         /* We are a server writing to an unauthenticated client */
2036         s->early_data_state = SSL_EARLY_DATA_UNAUTH_WRITING;
2037         ret = SSL_write_ex(s, buf, num, written);
2038         /* The buffering BIO is still in place */
2039         if (ret)
2040             (void)BIO_flush(s->wbio);
2041         s->early_data_state = early_data_state;
2042         return ret;
2043 
2044     default:
2045         SSLerr(SSL_F_SSL_WRITE_EARLY_DATA, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2046         return 0;
2047     }
2048 }
2049 
2050 int SSL_shutdown(SSL *s)
2051 {
2052     /*
2053      * Note that this function behaves differently from what one might
2054      * expect.  Return values are 0 for no success (yet), 1 for success; but
2055      * calling it once is usually not enough, even if blocking I/O is used
2056      * (see ssl3_shutdown).
2057      */
2058 
2059     if (s->handshake_func == NULL) {
2060         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
2061         return -1;
2062     }
2063 
2064     if (!SSL_in_init(s)) {
2065         if ((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
2066             struct ssl_async_args args;
2067 
2068             args.s = s;
2069             args.type = OTHERFUNC;
2070             args.f.func_other = s->method->ssl_shutdown;
2071 
2072             return ssl_start_async_job(s, &args, ssl_io_intern);
2073         } else {
2074             return s->method->ssl_shutdown(s);
2075         }
2076     } else {
2077         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_SHUTDOWN_WHILE_IN_INIT);
2078         return -1;
2079     }
2080 }
2081 
2082 int SSL_key_update(SSL *s, int updatetype)
2083 {
2084     /*
2085      * TODO(TLS1.3): How will applications know whether TLSv1.3 has been
2086      * negotiated, and that it is appropriate to call SSL_key_update() instead
2087      * of SSL_renegotiate().
2088      */
2089     if (!SSL_IS_TLS13(s)) {
2090         SSLerr(SSL_F_SSL_KEY_UPDATE, SSL_R_WRONG_SSL_VERSION);
2091         return 0;
2092     }
2093 
2094     if (updatetype != SSL_KEY_UPDATE_NOT_REQUESTED
2095             && updatetype != SSL_KEY_UPDATE_REQUESTED) {
2096         SSLerr(SSL_F_SSL_KEY_UPDATE, SSL_R_INVALID_KEY_UPDATE_TYPE);
2097         return 0;
2098     }
2099 
2100     if (!SSL_is_init_finished(s)) {
2101         SSLerr(SSL_F_SSL_KEY_UPDATE, SSL_R_STILL_IN_INIT);
2102         return 0;
2103     }
2104 
2105     ossl_statem_set_in_init(s, 1);
2106     s->key_update = updatetype;
2107     return 1;
2108 }
2109 
2110 int SSL_get_key_update_type(const SSL *s)
2111 {
2112     return s->key_update;
2113 }
2114 
2115 int SSL_renegotiate(SSL *s)
2116 {
2117     if (SSL_IS_TLS13(s)) {
2118         SSLerr(SSL_F_SSL_RENEGOTIATE, SSL_R_WRONG_SSL_VERSION);
2119         return 0;
2120     }
2121 
2122     if ((s->options & SSL_OP_NO_RENEGOTIATION)) {
2123         SSLerr(SSL_F_SSL_RENEGOTIATE, SSL_R_NO_RENEGOTIATION);
2124         return 0;
2125     }
2126 
2127     s->renegotiate = 1;
2128     s->new_session = 1;
2129 
2130     return s->method->ssl_renegotiate(s);
2131 }
2132 
2133 int SSL_renegotiate_abbreviated(SSL *s)
2134 {
2135     if (SSL_IS_TLS13(s)) {
2136         SSLerr(SSL_F_SSL_RENEGOTIATE_ABBREVIATED, SSL_R_WRONG_SSL_VERSION);
2137         return 0;
2138     }
2139 
2140     if ((s->options & SSL_OP_NO_RENEGOTIATION)) {
2141         SSLerr(SSL_F_SSL_RENEGOTIATE_ABBREVIATED, SSL_R_NO_RENEGOTIATION);
2142         return 0;
2143     }
2144 
2145     s->renegotiate = 1;
2146     s->new_session = 0;
2147 
2148     return s->method->ssl_renegotiate(s);
2149 }
2150 
2151 int SSL_renegotiate_pending(const SSL *s)
2152 {
2153     /*
2154      * becomes true when negotiation is requested; false again once a
2155      * handshake has finished
2156      */
2157     return (s->renegotiate != 0);
2158 }
2159 
2160 long SSL_ctrl(SSL *s, int cmd, long larg, void *parg)
2161 {
2162     long l;
2163 
2164     switch (cmd) {
2165     case SSL_CTRL_GET_READ_AHEAD:
2166         return RECORD_LAYER_get_read_ahead(&s->rlayer);
2167     case SSL_CTRL_SET_READ_AHEAD:
2168         l = RECORD_LAYER_get_read_ahead(&s->rlayer);
2169         RECORD_LAYER_set_read_ahead(&s->rlayer, larg);
2170         return l;
2171 
2172     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
2173         s->msg_callback_arg = parg;
2174         return 1;
2175 
2176     case SSL_CTRL_MODE:
2177         return (s->mode |= larg);
2178     case SSL_CTRL_CLEAR_MODE:
2179         return (s->mode &= ~larg);
2180     case SSL_CTRL_GET_MAX_CERT_LIST:
2181         return (long)s->max_cert_list;
2182     case SSL_CTRL_SET_MAX_CERT_LIST:
2183         if (larg < 0)
2184             return 0;
2185         l = (long)s->max_cert_list;
2186         s->max_cert_list = (size_t)larg;
2187         return l;
2188     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
2189         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
2190             return 0;
2191         s->max_send_fragment = larg;
2192         if (s->max_send_fragment < s->split_send_fragment)
2193             s->split_send_fragment = s->max_send_fragment;
2194         return 1;
2195     case SSL_CTRL_SET_SPLIT_SEND_FRAGMENT:
2196         if ((size_t)larg > s->max_send_fragment || larg == 0)
2197             return 0;
2198         s->split_send_fragment = larg;
2199         return 1;
2200     case SSL_CTRL_SET_MAX_PIPELINES:
2201         if (larg < 1 || larg > SSL_MAX_PIPELINES)
2202             return 0;
2203         s->max_pipelines = larg;
2204         if (larg > 1)
2205             RECORD_LAYER_set_read_ahead(&s->rlayer, 1);
2206         return 1;
2207     case SSL_CTRL_GET_RI_SUPPORT:
2208         if (s->s3)
2209             return s->s3->send_connection_binding;
2210         else
2211             return 0;
2212     case SSL_CTRL_CERT_FLAGS:
2213         return (s->cert->cert_flags |= larg);
2214     case SSL_CTRL_CLEAR_CERT_FLAGS:
2215         return (s->cert->cert_flags &= ~larg);
2216 
2217     case SSL_CTRL_GET_RAW_CIPHERLIST:
2218         if (parg) {
2219             if (s->s3->tmp.ciphers_raw == NULL)
2220                 return 0;
2221             *(unsigned char **)parg = s->s3->tmp.ciphers_raw;
2222             return (int)s->s3->tmp.ciphers_rawlen;
2223         } else {
2224             return TLS_CIPHER_LEN;
2225         }
2226     case SSL_CTRL_GET_EXTMS_SUPPORT:
2227         if (!s->session || SSL_in_init(s) || ossl_statem_get_in_handshake(s))
2228             return -1;
2229         if (s->session->flags & SSL_SESS_FLAG_EXTMS)
2230             return 1;
2231         else
2232             return 0;
2233     case SSL_CTRL_SET_MIN_PROTO_VERSION:
2234         return ssl_check_allowed_versions(larg, s->max_proto_version)
2235                && ssl_set_version_bound(s->ctx->method->version, (int)larg,
2236                                         &s->min_proto_version);
2237     case SSL_CTRL_GET_MIN_PROTO_VERSION:
2238         return s->min_proto_version;
2239     case SSL_CTRL_SET_MAX_PROTO_VERSION:
2240         return ssl_check_allowed_versions(s->min_proto_version, larg)
2241                && ssl_set_version_bound(s->ctx->method->version, (int)larg,
2242                                         &s->max_proto_version);
2243     case SSL_CTRL_GET_MAX_PROTO_VERSION:
2244         return s->max_proto_version;
2245     default:
2246         return s->method->ssl_ctrl(s, cmd, larg, parg);
2247     }
2248 }
2249 
2250 long SSL_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
2251 {
2252     switch (cmd) {
2253     case SSL_CTRL_SET_MSG_CALLBACK:
2254         s->msg_callback = (void (*)
2255                            (int write_p, int version, int content_type,
2256                             const void *buf, size_t len, SSL *ssl,
2257                             void *arg))(fp);
2258         return 1;
2259 
2260     default:
2261         return s->method->ssl_callback_ctrl(s, cmd, fp);
2262     }
2263 }
2264 
2265 LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx)
2266 {
2267     return ctx->sessions;
2268 }
2269 
2270 long SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
2271 {
2272     long l;
2273     /* For some cases with ctx == NULL perform syntax checks */
2274     if (ctx == NULL) {
2275         switch (cmd) {
2276 #ifndef OPENSSL_NO_EC
2277         case SSL_CTRL_SET_GROUPS_LIST:
2278             return tls1_set_groups_list(NULL, NULL, parg);
2279 #endif
2280         case SSL_CTRL_SET_SIGALGS_LIST:
2281         case SSL_CTRL_SET_CLIENT_SIGALGS_LIST:
2282             return tls1_set_sigalgs_list(NULL, parg, 0);
2283         default:
2284             return 0;
2285         }
2286     }
2287 
2288     switch (cmd) {
2289     case SSL_CTRL_GET_READ_AHEAD:
2290         return ctx->read_ahead;
2291     case SSL_CTRL_SET_READ_AHEAD:
2292         l = ctx->read_ahead;
2293         ctx->read_ahead = larg;
2294         return l;
2295 
2296     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
2297         ctx->msg_callback_arg = parg;
2298         return 1;
2299 
2300     case SSL_CTRL_GET_MAX_CERT_LIST:
2301         return (long)ctx->max_cert_list;
2302     case SSL_CTRL_SET_MAX_CERT_LIST:
2303         if (larg < 0)
2304             return 0;
2305         l = (long)ctx->max_cert_list;
2306         ctx->max_cert_list = (size_t)larg;
2307         return l;
2308 
2309     case SSL_CTRL_SET_SESS_CACHE_SIZE:
2310         if (larg < 0)
2311             return 0;
2312         l = (long)ctx->session_cache_size;
2313         ctx->session_cache_size = (size_t)larg;
2314         return l;
2315     case SSL_CTRL_GET_SESS_CACHE_SIZE:
2316         return (long)ctx->session_cache_size;
2317     case SSL_CTRL_SET_SESS_CACHE_MODE:
2318         l = ctx->session_cache_mode;
2319         ctx->session_cache_mode = larg;
2320         return l;
2321     case SSL_CTRL_GET_SESS_CACHE_MODE:
2322         return ctx->session_cache_mode;
2323 
2324     case SSL_CTRL_SESS_NUMBER:
2325         return lh_SSL_SESSION_num_items(ctx->sessions);
2326     case SSL_CTRL_SESS_CONNECT:
2327         return tsan_load(&ctx->stats.sess_connect);
2328     case SSL_CTRL_SESS_CONNECT_GOOD:
2329         return tsan_load(&ctx->stats.sess_connect_good);
2330     case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
2331         return tsan_load(&ctx->stats.sess_connect_renegotiate);
2332     case SSL_CTRL_SESS_ACCEPT:
2333         return tsan_load(&ctx->stats.sess_accept);
2334     case SSL_CTRL_SESS_ACCEPT_GOOD:
2335         return tsan_load(&ctx->stats.sess_accept_good);
2336     case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
2337         return tsan_load(&ctx->stats.sess_accept_renegotiate);
2338     case SSL_CTRL_SESS_HIT:
2339         return tsan_load(&ctx->stats.sess_hit);
2340     case SSL_CTRL_SESS_CB_HIT:
2341         return tsan_load(&ctx->stats.sess_cb_hit);
2342     case SSL_CTRL_SESS_MISSES:
2343         return tsan_load(&ctx->stats.sess_miss);
2344     case SSL_CTRL_SESS_TIMEOUTS:
2345         return tsan_load(&ctx->stats.sess_timeout);
2346     case SSL_CTRL_SESS_CACHE_FULL:
2347         return tsan_load(&ctx->stats.sess_cache_full);
2348     case SSL_CTRL_MODE:
2349         return (ctx->mode |= larg);
2350     case SSL_CTRL_CLEAR_MODE:
2351         return (ctx->mode &= ~larg);
2352     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
2353         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
2354             return 0;
2355         ctx->max_send_fragment = larg;
2356         if (ctx->max_send_fragment < ctx->split_send_fragment)
2357             ctx->split_send_fragment = ctx->max_send_fragment;
2358         return 1;
2359     case SSL_CTRL_SET_SPLIT_SEND_FRAGMENT:
2360         if ((size_t)larg > ctx->max_send_fragment || larg == 0)
2361             return 0;
2362         ctx->split_send_fragment = larg;
2363         return 1;
2364     case SSL_CTRL_SET_MAX_PIPELINES:
2365         if (larg < 1 || larg > SSL_MAX_PIPELINES)
2366             return 0;
2367         ctx->max_pipelines = larg;
2368         return 1;
2369     case SSL_CTRL_CERT_FLAGS:
2370         return (ctx->cert->cert_flags |= larg);
2371     case SSL_CTRL_CLEAR_CERT_FLAGS:
2372         return (ctx->cert->cert_flags &= ~larg);
2373     case SSL_CTRL_SET_MIN_PROTO_VERSION:
2374         return ssl_check_allowed_versions(larg, ctx->max_proto_version)
2375                && ssl_set_version_bound(ctx->method->version, (int)larg,
2376                                         &ctx->min_proto_version);
2377     case SSL_CTRL_GET_MIN_PROTO_VERSION:
2378         return ctx->min_proto_version;
2379     case SSL_CTRL_SET_MAX_PROTO_VERSION:
2380         return ssl_check_allowed_versions(ctx->min_proto_version, larg)
2381                && ssl_set_version_bound(ctx->method->version, (int)larg,
2382                                         &ctx->max_proto_version);
2383     case SSL_CTRL_GET_MAX_PROTO_VERSION:
2384         return ctx->max_proto_version;
2385     default:
2386         return ctx->method->ssl_ctx_ctrl(ctx, cmd, larg, parg);
2387     }
2388 }
2389 
2390 long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
2391 {
2392     switch (cmd) {
2393     case SSL_CTRL_SET_MSG_CALLBACK:
2394         ctx->msg_callback = (void (*)
2395                              (int write_p, int version, int content_type,
2396                               const void *buf, size_t len, SSL *ssl,
2397                               void *arg))(fp);
2398         return 1;
2399 
2400     default:
2401         return ctx->method->ssl_ctx_callback_ctrl(ctx, cmd, fp);
2402     }
2403 }
2404 
2405 int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
2406 {
2407     if (a->id > b->id)
2408         return 1;
2409     if (a->id < b->id)
2410         return -1;
2411     return 0;
2412 }
2413 
2414 int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap,
2415                           const SSL_CIPHER *const *bp)
2416 {
2417     if ((*ap)->id > (*bp)->id)
2418         return 1;
2419     if ((*ap)->id < (*bp)->id)
2420         return -1;
2421     return 0;
2422 }
2423 
2424 /** return a STACK of the ciphers available for the SSL and in order of
2425  * preference */
2426 STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s)
2427 {
2428     if (s != NULL) {
2429         if (s->cipher_list != NULL) {
2430             return s->cipher_list;
2431         } else if ((s->ctx != NULL) && (s->ctx->cipher_list != NULL)) {
2432             return s->ctx->cipher_list;
2433         }
2434     }
2435     return NULL;
2436 }
2437 
2438 STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *s)
2439 {
2440     if ((s == NULL) || (s->session == NULL) || !s->server)
2441         return NULL;
2442     return s->session->ciphers;
2443 }
2444 
2445 STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s)
2446 {
2447     STACK_OF(SSL_CIPHER) *sk = NULL, *ciphers;
2448     int i;
2449 
2450     ciphers = SSL_get_ciphers(s);
2451     if (!ciphers)
2452         return NULL;
2453     if (!ssl_set_client_disabled(s))
2454         return NULL;
2455     for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
2456         const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i);
2457         if (!ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0)) {
2458             if (!sk)
2459                 sk = sk_SSL_CIPHER_new_null();
2460             if (!sk)
2461                 return NULL;
2462             if (!sk_SSL_CIPHER_push(sk, c)) {
2463                 sk_SSL_CIPHER_free(sk);
2464                 return NULL;
2465             }
2466         }
2467     }
2468     return sk;
2469 }
2470 
2471 /** return a STACK of the ciphers available for the SSL and in order of
2472  * algorithm id */
2473 STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
2474 {
2475     if (s != NULL) {
2476         if (s->cipher_list_by_id != NULL) {
2477             return s->cipher_list_by_id;
2478         } else if ((s->ctx != NULL) && (s->ctx->cipher_list_by_id != NULL)) {
2479             return s->ctx->cipher_list_by_id;
2480         }
2481     }
2482     return NULL;
2483 }
2484 
2485 /** The old interface to get the same thing as SSL_get_ciphers() */
2486 const char *SSL_get_cipher_list(const SSL *s, int n)
2487 {
2488     const SSL_CIPHER *c;
2489     STACK_OF(SSL_CIPHER) *sk;
2490 
2491     if (s == NULL)
2492         return NULL;
2493     sk = SSL_get_ciphers(s);
2494     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
2495         return NULL;
2496     c = sk_SSL_CIPHER_value(sk, n);
2497     if (c == NULL)
2498         return NULL;
2499     return c->name;
2500 }
2501 
2502 /** return a STACK of the ciphers available for the SSL_CTX and in order of
2503  * preference */
2504 STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx)
2505 {
2506     if (ctx != NULL)
2507         return ctx->cipher_list;
2508     return NULL;
2509 }
2510 
2511 /*
2512  * Distinguish between ciphers controlled by set_ciphersuite() and
2513  * set_cipher_list() when counting.
2514  */
2515 static int cipher_list_tls12_num(STACK_OF(SSL_CIPHER) *sk)
2516 {
2517     int i, num = 0;
2518     const SSL_CIPHER *c;
2519 
2520     if (sk == NULL)
2521         return 0;
2522     for (i = 0; i < sk_SSL_CIPHER_num(sk); ++i) {
2523         c = sk_SSL_CIPHER_value(sk, i);
2524         if (c->min_tls >= TLS1_3_VERSION)
2525             continue;
2526         num++;
2527     }
2528     return num;
2529 }
2530 
2531 /** specify the ciphers to be used by default by the SSL_CTX */
2532 int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
2533 {
2534     STACK_OF(SSL_CIPHER) *sk;
2535 
2536     sk = ssl_create_cipher_list(ctx->method, ctx->tls13_ciphersuites,
2537                                 &ctx->cipher_list, &ctx->cipher_list_by_id, str,
2538                                 ctx->cert);
2539     /*
2540      * ssl_create_cipher_list may return an empty stack if it was unable to
2541      * find a cipher matching the given rule string (for example if the rule
2542      * string specifies a cipher which has been disabled). This is not an
2543      * error as far as ssl_create_cipher_list is concerned, and hence
2544      * ctx->cipher_list and ctx->cipher_list_by_id has been updated.
2545      */
2546     if (sk == NULL)
2547         return 0;
2548     else if (cipher_list_tls12_num(sk) == 0) {
2549         SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
2550         return 0;
2551     }
2552     return 1;
2553 }
2554 
2555 /** specify the ciphers to be used by the SSL */
2556 int SSL_set_cipher_list(SSL *s, const char *str)
2557 {
2558     STACK_OF(SSL_CIPHER) *sk;
2559 
2560     sk = ssl_create_cipher_list(s->ctx->method, s->tls13_ciphersuites,
2561                                 &s->cipher_list, &s->cipher_list_by_id, str,
2562                                 s->cert);
2563     /* see comment in SSL_CTX_set_cipher_list */
2564     if (sk == NULL)
2565         return 0;
2566     else if (cipher_list_tls12_num(sk) == 0) {
2567         SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
2568         return 0;
2569     }
2570     return 1;
2571 }
2572 
2573 char *SSL_get_shared_ciphers(const SSL *s, char *buf, int size)
2574 {
2575     char *p;
2576     STACK_OF(SSL_CIPHER) *clntsk, *srvrsk;
2577     const SSL_CIPHER *c;
2578     int i;
2579 
2580     if (!s->server
2581             || s->session == NULL
2582             || s->session->ciphers == NULL
2583             || size < 2)
2584         return NULL;
2585 
2586     p = buf;
2587     clntsk = s->session->ciphers;
2588     srvrsk = SSL_get_ciphers(s);
2589     if (clntsk == NULL || srvrsk == NULL)
2590         return NULL;
2591 
2592     if (sk_SSL_CIPHER_num(clntsk) == 0 || sk_SSL_CIPHER_num(srvrsk) == 0)
2593         return NULL;
2594 
2595     for (i = 0; i < sk_SSL_CIPHER_num(clntsk); i++) {
2596         int n;
2597 
2598         c = sk_SSL_CIPHER_value(clntsk, i);
2599         if (sk_SSL_CIPHER_find(srvrsk, c) < 0)
2600             continue;
2601 
2602         n = strlen(c->name);
2603         if (n + 1 > size) {
2604             if (p != buf)
2605                 --p;
2606             *p = '\0';
2607             return buf;
2608         }
2609         strcpy(p, c->name);
2610         p += n;
2611         *(p++) = ':';
2612         size -= n + 1;
2613     }
2614     p[-1] = '\0';
2615     return buf;
2616 }
2617 
2618 /** return a servername extension value if provided in Client Hello, or NULL.
2619  * So far, only host_name types are defined (RFC 3546).
2620  */
2621 
2622 const char *SSL_get_servername(const SSL *s, const int type)
2623 {
2624     if (type != TLSEXT_NAMETYPE_host_name)
2625         return NULL;
2626 
2627     /*
2628      * SNI is not negotiated in pre-TLS-1.3 resumption flows, so fake up an
2629      * SNI value to return if we are resuming/resumed.  N.B. that we still
2630      * call the relevant callbacks for such resumption flows, and callbacks
2631      * might error out if there is not a SNI value available.
2632      */
2633     if (s->hit)
2634         return s->session->ext.hostname;
2635     return s->ext.hostname;
2636 }
2637 
2638 int SSL_get_servername_type(const SSL *s)
2639 {
2640     if (s->session
2641         && (!s->ext.hostname ? s->session->
2642             ext.hostname : s->ext.hostname))
2643         return TLSEXT_NAMETYPE_host_name;
2644     return -1;
2645 }
2646 
2647 /*
2648  * SSL_select_next_proto implements the standard protocol selection. It is
2649  * expected that this function is called from the callback set by
2650  * SSL_CTX_set_next_proto_select_cb. The protocol data is assumed to be a
2651  * vector of 8-bit, length prefixed byte strings. The length byte itself is
2652  * not included in the length. A byte string of length 0 is invalid. No byte
2653  * string may be truncated. The current, but experimental algorithm for
2654  * selecting the protocol is: 1) If the server doesn't support NPN then this
2655  * is indicated to the callback. In this case, the client application has to
2656  * abort the connection or have a default application level protocol. 2) If
2657  * the server supports NPN, but advertises an empty list then the client
2658  * selects the first protocol in its list, but indicates via the API that this
2659  * fallback case was enacted. 3) Otherwise, the client finds the first
2660  * protocol in the server's list that it supports and selects this protocol.
2661  * This is because it's assumed that the server has better information about
2662  * which protocol a client should use. 4) If the client doesn't support any
2663  * of the server's advertised protocols, then this is treated the same as
2664  * case 2. It returns either OPENSSL_NPN_NEGOTIATED if a common protocol was
2665  * found, or OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
2666  */
2667 int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
2668                           const unsigned char *server,
2669                           unsigned int server_len,
2670                           const unsigned char *client, unsigned int client_len)
2671 {
2672     unsigned int i, j;
2673     const unsigned char *result;
2674     int status = OPENSSL_NPN_UNSUPPORTED;
2675 
2676     /*
2677      * For each protocol in server preference order, see if we support it.
2678      */
2679     for (i = 0; i < server_len;) {
2680         for (j = 0; j < client_len;) {
2681             if (server[i] == client[j] &&
2682                 memcmp(&server[i + 1], &client[j + 1], server[i]) == 0) {
2683                 /* We found a match */
2684                 result = &server[i];
2685                 status = OPENSSL_NPN_NEGOTIATED;
2686                 goto found;
2687             }
2688             j += client[j];
2689             j++;
2690         }
2691         i += server[i];
2692         i++;
2693     }
2694 
2695     /* There's no overlap between our protocols and the server's list. */
2696     result = client;
2697     status = OPENSSL_NPN_NO_OVERLAP;
2698 
2699  found:
2700     *out = (unsigned char *)result + 1;
2701     *outlen = result[0];
2702     return status;
2703 }
2704 
2705 #ifndef OPENSSL_NO_NEXTPROTONEG
2706 /*
2707  * SSL_get0_next_proto_negotiated sets *data and *len to point to the
2708  * client's requested protocol for this connection and returns 0. If the
2709  * client didn't request any protocol, then *data is set to NULL. Note that
2710  * the client can request any protocol it chooses. The value returned from
2711  * this function need not be a member of the list of supported protocols
2712  * provided by the callback.
2713  */
2714 void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data,
2715                                     unsigned *len)
2716 {
2717     *data = s->ext.npn;
2718     if (!*data) {
2719         *len = 0;
2720     } else {
2721         *len = (unsigned int)s->ext.npn_len;
2722     }
2723 }
2724 
2725 /*
2726  * SSL_CTX_set_npn_advertised_cb sets a callback that is called when
2727  * a TLS server needs a list of supported protocols for Next Protocol
2728  * Negotiation. The returned list must be in wire format.  The list is
2729  * returned by setting |out| to point to it and |outlen| to its length. This
2730  * memory will not be modified, but one should assume that the SSL* keeps a
2731  * reference to it. The callback should return SSL_TLSEXT_ERR_OK if it
2732  * wishes to advertise. Otherwise, no such extension will be included in the
2733  * ServerHello.
2734  */
2735 void SSL_CTX_set_npn_advertised_cb(SSL_CTX *ctx,
2736                                    SSL_CTX_npn_advertised_cb_func cb,
2737                                    void *arg)
2738 {
2739     ctx->ext.npn_advertised_cb = cb;
2740     ctx->ext.npn_advertised_cb_arg = arg;
2741 }
2742 
2743 /*
2744  * SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
2745  * client needs to select a protocol from the server's provided list. |out|
2746  * must be set to point to the selected protocol (which may be within |in|).
2747  * The length of the protocol name must be written into |outlen|. The
2748  * server's advertised protocols are provided in |in| and |inlen|. The
2749  * callback can assume that |in| is syntactically valid. The client must
2750  * select a protocol. It is fatal to the connection if this callback returns
2751  * a value other than SSL_TLSEXT_ERR_OK.
2752  */
2753 void SSL_CTX_set_npn_select_cb(SSL_CTX *ctx,
2754                                SSL_CTX_npn_select_cb_func cb,
2755                                void *arg)
2756 {
2757     ctx->ext.npn_select_cb = cb;
2758     ctx->ext.npn_select_cb_arg = arg;
2759 }
2760 #endif
2761 
2762 /*
2763  * SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
2764  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
2765  * length-prefixed strings). Returns 0 on success.
2766  */
2767 int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
2768                             unsigned int protos_len)
2769 {
2770     OPENSSL_free(ctx->ext.alpn);
2771     ctx->ext.alpn = OPENSSL_memdup(protos, protos_len);
2772     if (ctx->ext.alpn == NULL) {
2773         SSLerr(SSL_F_SSL_CTX_SET_ALPN_PROTOS, ERR_R_MALLOC_FAILURE);
2774         return 1;
2775     }
2776     ctx->ext.alpn_len = protos_len;
2777 
2778     return 0;
2779 }
2780 
2781 /*
2782  * SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
2783  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
2784  * length-prefixed strings). Returns 0 on success.
2785  */
2786 int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
2787                         unsigned int protos_len)
2788 {
2789     OPENSSL_free(ssl->ext.alpn);
2790     ssl->ext.alpn = OPENSSL_memdup(protos, protos_len);
2791     if (ssl->ext.alpn == NULL) {
2792         SSLerr(SSL_F_SSL_SET_ALPN_PROTOS, ERR_R_MALLOC_FAILURE);
2793         return 1;
2794     }
2795     ssl->ext.alpn_len = protos_len;
2796 
2797     return 0;
2798 }
2799 
2800 /*
2801  * SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is
2802  * called during ClientHello processing in order to select an ALPN protocol
2803  * from the client's list of offered protocols.
2804  */
2805 void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
2806                                 SSL_CTX_alpn_select_cb_func cb,
2807                                 void *arg)
2808 {
2809     ctx->ext.alpn_select_cb = cb;
2810     ctx->ext.alpn_select_cb_arg = arg;
2811 }
2812 
2813 /*
2814  * SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from |ssl|.
2815  * On return it sets |*data| to point to |*len| bytes of protocol name
2816  * (not including the leading length-prefix byte). If the server didn't
2817  * respond with a negotiated protocol then |*len| will be zero.
2818  */
2819 void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
2820                             unsigned int *len)
2821 {
2822     *data = NULL;
2823     if (ssl->s3)
2824         *data = ssl->s3->alpn_selected;
2825     if (*data == NULL)
2826         *len = 0;
2827     else
2828         *len = (unsigned int)ssl->s3->alpn_selected_len;
2829 }
2830 
2831 int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
2832                                const char *label, size_t llen,
2833                                const unsigned char *context, size_t contextlen,
2834                                int use_context)
2835 {
2836     if (s->version < TLS1_VERSION && s->version != DTLS1_BAD_VER)
2837         return -1;
2838 
2839     return s->method->ssl3_enc->export_keying_material(s, out, olen, label,
2840                                                        llen, context,
2841                                                        contextlen, use_context);
2842 }
2843 
2844 int SSL_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
2845                                      const char *label, size_t llen,
2846                                      const unsigned char *context,
2847                                      size_t contextlen)
2848 {
2849     if (s->version != TLS1_3_VERSION)
2850         return 0;
2851 
2852     return tls13_export_keying_material_early(s, out, olen, label, llen,
2853                                               context, contextlen);
2854 }
2855 
2856 static unsigned long ssl_session_hash(const SSL_SESSION *a)
2857 {
2858     const unsigned char *session_id = a->session_id;
2859     unsigned long l;
2860     unsigned char tmp_storage[4];
2861 
2862     if (a->session_id_length < sizeof(tmp_storage)) {
2863         memset(tmp_storage, 0, sizeof(tmp_storage));
2864         memcpy(tmp_storage, a->session_id, a->session_id_length);
2865         session_id = tmp_storage;
2866     }
2867 
2868     l = (unsigned long)
2869         ((unsigned long)session_id[0]) |
2870         ((unsigned long)session_id[1] << 8L) |
2871         ((unsigned long)session_id[2] << 16L) |
2872         ((unsigned long)session_id[3] << 24L);
2873     return l;
2874 }
2875 
2876 /*
2877  * NB: If this function (or indeed the hash function which uses a sort of
2878  * coarser function than this one) is changed, ensure
2879  * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on
2880  * being able to construct an SSL_SESSION that will collide with any existing
2881  * session with a matching session ID.
2882  */
2883 static int ssl_session_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
2884 {
2885     if (a->ssl_version != b->ssl_version)
2886         return 1;
2887     if (a->session_id_length != b->session_id_length)
2888         return 1;
2889     return memcmp(a->session_id, b->session_id, a->session_id_length);
2890 }
2891 
2892 /*
2893  * These wrapper functions should remain rather than redeclaring
2894  * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
2895  * variable. The reason is that the functions aren't static, they're exposed
2896  * via ssl.h.
2897  */
2898 
2899 SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
2900 {
2901     SSL_CTX *ret = NULL;
2902 
2903     if (meth == NULL) {
2904         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_NULL_SSL_METHOD_PASSED);
2905         return NULL;
2906     }
2907 
2908     if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL))
2909         return NULL;
2910 
2911     if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0) {
2912         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
2913         goto err;
2914     }
2915     ret = OPENSSL_zalloc(sizeof(*ret));
2916     if (ret == NULL)
2917         goto err;
2918 
2919     ret->method = meth;
2920     ret->min_proto_version = 0;
2921     ret->max_proto_version = 0;
2922     ret->mode = SSL_MODE_AUTO_RETRY;
2923     ret->session_cache_mode = SSL_SESS_CACHE_SERVER;
2924     ret->session_cache_size = SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
2925     /* We take the system default. */
2926     ret->session_timeout = meth->get_timeout();
2927     ret->references = 1;
2928     ret->lock = CRYPTO_THREAD_lock_new();
2929     if (ret->lock == NULL) {
2930         SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
2931         OPENSSL_free(ret);
2932         return NULL;
2933     }
2934     ret->max_cert_list = SSL_MAX_CERT_LIST_DEFAULT;
2935     ret->verify_mode = SSL_VERIFY_NONE;
2936     if ((ret->cert = ssl_cert_new()) == NULL)
2937         goto err;
2938 
2939     ret->sessions = lh_SSL_SESSION_new(ssl_session_hash, ssl_session_cmp);
2940     if (ret->sessions == NULL)
2941         goto err;
2942     ret->cert_store = X509_STORE_new();
2943     if (ret->cert_store == NULL)
2944         goto err;
2945 #ifndef OPENSSL_NO_CT
2946     ret->ctlog_store = CTLOG_STORE_new();
2947     if (ret->ctlog_store == NULL)
2948         goto err;
2949 #endif
2950 
2951     if (!SSL_CTX_set_ciphersuites(ret, TLS_DEFAULT_CIPHERSUITES))
2952         goto err;
2953 
2954     if (!ssl_create_cipher_list(ret->method,
2955                                 ret->tls13_ciphersuites,
2956                                 &ret->cipher_list, &ret->cipher_list_by_id,
2957                                 SSL_DEFAULT_CIPHER_LIST, ret->cert)
2958         || sk_SSL_CIPHER_num(ret->cipher_list) <= 0) {
2959         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_LIBRARY_HAS_NO_CIPHERS);
2960         goto err2;
2961     }
2962 
2963     ret->param = X509_VERIFY_PARAM_new();
2964     if (ret->param == NULL)
2965         goto err;
2966 
2967     if ((ret->md5 = EVP_get_digestbyname("ssl3-md5")) == NULL) {
2968         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
2969         goto err2;
2970     }
2971     if ((ret->sha1 = EVP_get_digestbyname("ssl3-sha1")) == NULL) {
2972         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
2973         goto err2;
2974     }
2975 
2976     if ((ret->ca_names = sk_X509_NAME_new_null()) == NULL)
2977         goto err;
2978 
2979     if ((ret->client_ca_names = sk_X509_NAME_new_null()) == NULL)
2980         goto err;
2981 
2982     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data))
2983         goto err;
2984 
2985     if ((ret->ext.secure = OPENSSL_secure_zalloc(sizeof(*ret->ext.secure))) == NULL)
2986         goto err;
2987 
2988     /* No compression for DTLS */
2989     if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS))
2990         ret->comp_methods = SSL_COMP_get_compression_methods();
2991 
2992     ret->max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
2993     ret->split_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
2994 
2995     /* Setup RFC5077 ticket keys */
2996     if ((RAND_bytes(ret->ext.tick_key_name,
2997                     sizeof(ret->ext.tick_key_name)) <= 0)
2998         || (RAND_priv_bytes(ret->ext.secure->tick_hmac_key,
2999                        sizeof(ret->ext.secure->tick_hmac_key)) <= 0)
3000         || (RAND_priv_bytes(ret->ext.secure->tick_aes_key,
3001                        sizeof(ret->ext.secure->tick_aes_key)) <= 0))
3002         ret->options |= SSL_OP_NO_TICKET;
3003 
3004     if (RAND_priv_bytes(ret->ext.cookie_hmac_key,
3005                    sizeof(ret->ext.cookie_hmac_key)) <= 0)
3006         goto err;
3007 
3008 #ifndef OPENSSL_NO_SRP
3009     if (!SSL_CTX_SRP_CTX_init(ret))
3010         goto err;
3011 #endif
3012 #ifndef OPENSSL_NO_ENGINE
3013 # ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
3014 #  define eng_strx(x)     #x
3015 #  define eng_str(x)      eng_strx(x)
3016     /* Use specific client engine automatically... ignore errors */
3017     {
3018         ENGINE *eng;
3019         eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
3020         if (!eng) {
3021             ERR_clear_error();
3022             ENGINE_load_builtin_engines();
3023             eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
3024         }
3025         if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
3026             ERR_clear_error();
3027     }
3028 # endif
3029 #endif
3030     /*
3031      * Default is to connect to non-RI servers. When RI is more widely
3032      * deployed might change this.
3033      */
3034     ret->options |= SSL_OP_LEGACY_SERVER_CONNECT;
3035     /*
3036      * Disable compression by default to prevent CRIME. Applications can
3037      * re-enable compression by configuring
3038      * SSL_CTX_clear_options(ctx, SSL_OP_NO_COMPRESSION);
3039      * or by using the SSL_CONF library. Similarly we also enable TLSv1.3
3040      * middlebox compatibility by default. This may be disabled by default in
3041      * a later OpenSSL version.
3042      */
3043     ret->options |= SSL_OP_NO_COMPRESSION | SSL_OP_ENABLE_MIDDLEBOX_COMPAT;
3044 
3045     ret->ext.status_type = TLSEXT_STATUSTYPE_nothing;
3046 
3047     /*
3048      * We cannot usefully set a default max_early_data here (which gets
3049      * propagated in SSL_new(), for the following reason: setting the
3050      * SSL field causes tls_construct_stoc_early_data() to tell the
3051      * client that early data will be accepted when constructing a TLS 1.3
3052      * session ticket, and the client will accordingly send us early data
3053      * when using that ticket (if the client has early data to send).
3054      * However, in order for the early data to actually be consumed by
3055      * the application, the application must also have calls to
3056      * SSL_read_early_data(); otherwise we'll just skip past the early data
3057      * and ignore it.  So, since the application must add calls to
3058      * SSL_read_early_data(), we also require them to add
3059      * calls to SSL_CTX_set_max_early_data() in order to use early data,
3060      * eliminating the bandwidth-wasting early data in the case described
3061      * above.
3062      */
3063     ret->max_early_data = 0;
3064 
3065     /*
3066      * Default recv_max_early_data is a fully loaded single record. Could be
3067      * split across multiple records in practice. We set this differently to
3068      * max_early_data so that, in the default case, we do not advertise any
3069      * support for early_data, but if a client were to send us some (e.g.
3070      * because of an old, stale ticket) then we will tolerate it and skip over
3071      * it.
3072      */
3073     ret->recv_max_early_data = SSL3_RT_MAX_PLAIN_LENGTH;
3074 
3075     /* By default we send two session tickets automatically in TLSv1.3 */
3076     ret->num_tickets = 2;
3077 
3078     ssl_ctx_system_config(ret);
3079 
3080     return ret;
3081  err:
3082     SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
3083  err2:
3084     SSL_CTX_free(ret);
3085     return NULL;
3086 }
3087 
3088 int SSL_CTX_up_ref(SSL_CTX *ctx)
3089 {
3090     int i;
3091 
3092     if (CRYPTO_UP_REF(&ctx->references, &i, ctx->lock) <= 0)
3093         return 0;
3094 
3095     REF_PRINT_COUNT("SSL_CTX", ctx);
3096     REF_ASSERT_ISNT(i < 2);
3097     return ((i > 1) ? 1 : 0);
3098 }
3099 
3100 void SSL_CTX_free(SSL_CTX *a)
3101 {
3102     int i;
3103 
3104     if (a == NULL)
3105         return;
3106 
3107     CRYPTO_DOWN_REF(&a->references, &i, a->lock);
3108     REF_PRINT_COUNT("SSL_CTX", a);
3109     if (i > 0)
3110         return;
3111     REF_ASSERT_ISNT(i < 0);
3112 
3113     X509_VERIFY_PARAM_free(a->param);
3114     dane_ctx_final(&a->dane);
3115 
3116     /*
3117      * Free internal session cache. However: the remove_cb() may reference
3118      * the ex_data of SSL_CTX, thus the ex_data store can only be removed
3119      * after the sessions were flushed.
3120      * As the ex_data handling routines might also touch the session cache,
3121      * the most secure solution seems to be: empty (flush) the cache, then
3122      * free ex_data, then finally free the cache.
3123      * (See ticket [openssl.org #212].)
3124      */
3125     if (a->sessions != NULL)
3126         SSL_CTX_flush_sessions(a, 0);
3127 
3128     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);
3129     lh_SSL_SESSION_free(a->sessions);
3130     X509_STORE_free(a->cert_store);
3131 #ifndef OPENSSL_NO_CT
3132     CTLOG_STORE_free(a->ctlog_store);
3133 #endif
3134     sk_SSL_CIPHER_free(a->cipher_list);
3135     sk_SSL_CIPHER_free(a->cipher_list_by_id);
3136     sk_SSL_CIPHER_free(a->tls13_ciphersuites);
3137     ssl_cert_free(a->cert);
3138     sk_X509_NAME_pop_free(a->ca_names, X509_NAME_free);
3139     sk_X509_NAME_pop_free(a->client_ca_names, X509_NAME_free);
3140     sk_X509_pop_free(a->extra_certs, X509_free);
3141     a->comp_methods = NULL;
3142 #ifndef OPENSSL_NO_SRTP
3143     sk_SRTP_PROTECTION_PROFILE_free(a->srtp_profiles);
3144 #endif
3145 #ifndef OPENSSL_NO_SRP
3146     SSL_CTX_SRP_CTX_free(a);
3147 #endif
3148 #ifndef OPENSSL_NO_ENGINE
3149     ENGINE_finish(a->client_cert_engine);
3150 #endif
3151 
3152 #ifndef OPENSSL_NO_EC
3153     OPENSSL_free(a->ext.ecpointformats);
3154     OPENSSL_free(a->ext.supportedgroups);
3155 #endif
3156     OPENSSL_free(a->ext.alpn);
3157     OPENSSL_secure_free(a->ext.secure);
3158 
3159     CRYPTO_THREAD_lock_free(a->lock);
3160 
3161     OPENSSL_free(a);
3162 }
3163 
3164 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
3165 {
3166     ctx->default_passwd_callback = cb;
3167 }
3168 
3169 void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u)
3170 {
3171     ctx->default_passwd_callback_userdata = u;
3172 }
3173 
3174 pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx)
3175 {
3176     return ctx->default_passwd_callback;
3177 }
3178 
3179 void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx)
3180 {
3181     return ctx->default_passwd_callback_userdata;
3182 }
3183 
3184 void SSL_set_default_passwd_cb(SSL *s, pem_password_cb *cb)
3185 {
3186     s->default_passwd_callback = cb;
3187 }
3188 
3189 void SSL_set_default_passwd_cb_userdata(SSL *s, void *u)
3190 {
3191     s->default_passwd_callback_userdata = u;
3192 }
3193 
3194 pem_password_cb *SSL_get_default_passwd_cb(SSL *s)
3195 {
3196     return s->default_passwd_callback;
3197 }
3198 
3199 void *SSL_get_default_passwd_cb_userdata(SSL *s)
3200 {
3201     return s->default_passwd_callback_userdata;
3202 }
3203 
3204 void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
3205                                       int (*cb) (X509_STORE_CTX *, void *),
3206                                       void *arg)
3207 {
3208     ctx->app_verify_callback = cb;
3209     ctx->app_verify_arg = arg;
3210 }
3211 
3212 void SSL_CTX_set_verify(SSL_CTX *ctx, int mode,
3213                         int (*cb) (int, X509_STORE_CTX *))
3214 {
3215     ctx->verify_mode = mode;
3216     ctx->default_verify_callback = cb;
3217 }
3218 
3219 void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth)
3220 {
3221     X509_VERIFY_PARAM_set_depth(ctx->param, depth);
3222 }
3223 
3224 void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb) (SSL *ssl, void *arg), void *arg)
3225 {
3226     ssl_cert_set_cert_cb(c->cert, cb, arg);
3227 }
3228 
3229 void SSL_set_cert_cb(SSL *s, int (*cb) (SSL *ssl, void *arg), void *arg)
3230 {
3231     ssl_cert_set_cert_cb(s->cert, cb, arg);
3232 }
3233 
3234 void ssl_set_masks(SSL *s)
3235 {
3236     CERT *c = s->cert;
3237     uint32_t *pvalid = s->s3->tmp.valid_flags;
3238     int rsa_enc, rsa_sign, dh_tmp, dsa_sign;
3239     unsigned long mask_k, mask_a;
3240 #ifndef OPENSSL_NO_EC
3241     int have_ecc_cert, ecdsa_ok;
3242 #endif
3243     if (c == NULL)
3244         return;
3245 
3246 #ifndef OPENSSL_NO_DH
3247     dh_tmp = (c->dh_tmp != NULL || c->dh_tmp_cb != NULL || c->dh_tmp_auto);
3248 #else
3249     dh_tmp = 0;
3250 #endif
3251 
3252     rsa_enc = pvalid[SSL_PKEY_RSA] & CERT_PKEY_VALID;
3253     rsa_sign = pvalid[SSL_PKEY_RSA] & CERT_PKEY_VALID;
3254     dsa_sign = pvalid[SSL_PKEY_DSA_SIGN] & CERT_PKEY_VALID;
3255 #ifndef OPENSSL_NO_EC
3256     have_ecc_cert = pvalid[SSL_PKEY_ECC] & CERT_PKEY_VALID;
3257 #endif
3258     mask_k = 0;
3259     mask_a = 0;
3260 
3261 #ifdef CIPHER_DEBUG
3262     fprintf(stderr, "dht=%d re=%d rs=%d ds=%d\n",
3263             dh_tmp, rsa_enc, rsa_sign, dsa_sign);
3264 #endif
3265 
3266 #ifndef OPENSSL_NO_GOST
3267     if (ssl_has_cert(s, SSL_PKEY_GOST12_512)) {
3268         mask_k |= SSL_kGOST;
3269         mask_a |= SSL_aGOST12;
3270     }
3271     if (ssl_has_cert(s, SSL_PKEY_GOST12_256)) {
3272         mask_k |= SSL_kGOST;
3273         mask_a |= SSL_aGOST12;
3274     }
3275     if (ssl_has_cert(s, SSL_PKEY_GOST01)) {
3276         mask_k |= SSL_kGOST;
3277         mask_a |= SSL_aGOST01;
3278     }
3279 #endif
3280 
3281     if (rsa_enc)
3282         mask_k |= SSL_kRSA;
3283 
3284     if (dh_tmp)
3285         mask_k |= SSL_kDHE;
3286 
3287     /*
3288      * If we only have an RSA-PSS certificate allow RSA authentication
3289      * if TLS 1.2 and peer supports it.
3290      */
3291 
3292     if (rsa_enc || rsa_sign || (ssl_has_cert(s, SSL_PKEY_RSA_PSS_SIGN)
3293                 && pvalid[SSL_PKEY_RSA_PSS_SIGN] & CERT_PKEY_EXPLICIT_SIGN
3294                 && TLS1_get_version(s) == TLS1_2_VERSION))
3295         mask_a |= SSL_aRSA;
3296 
3297     if (dsa_sign) {
3298         mask_a |= SSL_aDSS;
3299     }
3300 
3301     mask_a |= SSL_aNULL;
3302 
3303     /*
3304      * An ECC certificate may be usable for ECDH and/or ECDSA cipher suites
3305      * depending on the key usage extension.
3306      */
3307 #ifndef OPENSSL_NO_EC
3308     if (have_ecc_cert) {
3309         uint32_t ex_kusage;
3310         ex_kusage = X509_get_key_usage(c->pkeys[SSL_PKEY_ECC].x509);
3311         ecdsa_ok = ex_kusage & X509v3_KU_DIGITAL_SIGNATURE;
3312         if (!(pvalid[SSL_PKEY_ECC] & CERT_PKEY_SIGN))
3313             ecdsa_ok = 0;
3314         if (ecdsa_ok)
3315             mask_a |= SSL_aECDSA;
3316     }
3317     /* Allow Ed25519 for TLS 1.2 if peer supports it */
3318     if (!(mask_a & SSL_aECDSA) && ssl_has_cert(s, SSL_PKEY_ED25519)
3319             && pvalid[SSL_PKEY_ED25519] & CERT_PKEY_EXPLICIT_SIGN
3320             && TLS1_get_version(s) == TLS1_2_VERSION)
3321             mask_a |= SSL_aECDSA;
3322 
3323     /* Allow Ed448 for TLS 1.2 if peer supports it */
3324     if (!(mask_a & SSL_aECDSA) && ssl_has_cert(s, SSL_PKEY_ED448)
3325             && pvalid[SSL_PKEY_ED448] & CERT_PKEY_EXPLICIT_SIGN
3326             && TLS1_get_version(s) == TLS1_2_VERSION)
3327             mask_a |= SSL_aECDSA;
3328 #endif
3329 
3330 #ifndef OPENSSL_NO_EC
3331     mask_k |= SSL_kECDHE;
3332 #endif
3333 
3334 #ifndef OPENSSL_NO_PSK
3335     mask_k |= SSL_kPSK;
3336     mask_a |= SSL_aPSK;
3337     if (mask_k & SSL_kRSA)
3338         mask_k |= SSL_kRSAPSK;
3339     if (mask_k & SSL_kDHE)
3340         mask_k |= SSL_kDHEPSK;
3341     if (mask_k & SSL_kECDHE)
3342         mask_k |= SSL_kECDHEPSK;
3343 #endif
3344 
3345     s->s3->tmp.mask_k = mask_k;
3346     s->s3->tmp.mask_a = mask_a;
3347 }
3348 
3349 #ifndef OPENSSL_NO_EC
3350 
3351 int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
3352 {
3353     if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA) {
3354         /* key usage, if present, must allow signing */
3355         if (!(X509_get_key_usage(x) & X509v3_KU_DIGITAL_SIGNATURE)) {
3356             SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
3357                    SSL_R_ECC_CERT_NOT_FOR_SIGNING);
3358             return 0;
3359         }
3360     }
3361     return 1;                   /* all checks are ok */
3362 }
3363 
3364 #endif
3365 
3366 int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
3367                                    size_t *serverinfo_length)
3368 {
3369     CERT_PKEY *cpk = s->s3->tmp.cert;
3370     *serverinfo_length = 0;
3371 
3372     if (cpk == NULL || cpk->serverinfo == NULL)
3373         return 0;
3374 
3375     *serverinfo = cpk->serverinfo;
3376     *serverinfo_length = cpk->serverinfo_length;
3377     return 1;
3378 }
3379 
3380 void ssl_update_cache(SSL *s, int mode)
3381 {
3382     int i;
3383 
3384     /*
3385      * If the session_id_length is 0, we are not supposed to cache it, and it
3386      * would be rather hard to do anyway :-)
3387      */
3388     if (s->session->session_id_length == 0)
3389         return;
3390 
3391     /*
3392      * If sid_ctx_length is 0 there is no specific application context
3393      * associated with this session, so when we try to resume it and
3394      * SSL_VERIFY_PEER is requested to verify the client identity, we have no
3395      * indication that this is actually a session for the proper application
3396      * context, and the *handshake* will fail, not just the resumption attempt.
3397      * Do not cache (on the server) these sessions that are not resumable
3398      * (clients can set SSL_VERIFY_PEER without needing a sid_ctx set).
3399      */
3400     if (s->server && s->session->sid_ctx_length == 0
3401             && (s->verify_mode & SSL_VERIFY_PEER) != 0)
3402         return;
3403 
3404     i = s->session_ctx->session_cache_mode;
3405     if ((i & mode) != 0
3406         && (!s->hit || SSL_IS_TLS13(s))) {
3407         /*
3408          * Add the session to the internal cache. In server side TLSv1.3 we
3409          * normally don't do this because by default it's a full stateless ticket
3410          * with only a dummy session id so there is no reason to cache it,
3411          * unless:
3412          * - we are doing early_data, in which case we cache so that we can
3413          *   detect replays
3414          * - the application has set a remove_session_cb so needs to know about
3415          *   session timeout events
3416          * - SSL_OP_NO_TICKET is set in which case it is a stateful ticket
3417          */
3418         if ((i & SSL_SESS_CACHE_NO_INTERNAL_STORE) == 0
3419                 && (!SSL_IS_TLS13(s)
3420                     || !s->server
3421                     || (s->max_early_data > 0
3422                         && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0)
3423                     || s->session_ctx->remove_session_cb != NULL
3424                     || (s->options & SSL_OP_NO_TICKET) != 0))
3425             SSL_CTX_add_session(s->session_ctx, s->session);
3426 
3427         /*
3428          * Add the session to the external cache. We do this even in server side
3429          * TLSv1.3 without early data because some applications just want to
3430          * know about the creation of a session and aren't doing a full cache.
3431          */
3432         if (s->session_ctx->new_session_cb != NULL) {
3433             SSL_SESSION_up_ref(s->session);
3434             if (!s->session_ctx->new_session_cb(s, s->session))
3435                 SSL_SESSION_free(s->session);
3436         }
3437     }
3438 
3439     /* auto flush every 255 connections */
3440     if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) && ((i & mode) == mode)) {
3441         TSAN_QUALIFIER int *stat;
3442         if (mode & SSL_SESS_CACHE_CLIENT)
3443             stat = &s->session_ctx->stats.sess_connect_good;
3444         else
3445             stat = &s->session_ctx->stats.sess_accept_good;
3446         if ((tsan_load(stat) & 0xff) == 0xff)
3447             SSL_CTX_flush_sessions(s->session_ctx, (unsigned long)time(NULL));
3448     }
3449 }
3450 
3451 const SSL_METHOD *SSL_CTX_get_ssl_method(const SSL_CTX *ctx)
3452 {
3453     return ctx->method;
3454 }
3455 
3456 const SSL_METHOD *SSL_get_ssl_method(const SSL *s)
3457 {
3458     return s->method;
3459 }
3460 
3461 int SSL_set_ssl_method(SSL *s, const SSL_METHOD *meth)
3462 {
3463     int ret = 1;
3464 
3465     if (s->method != meth) {
3466         const SSL_METHOD *sm = s->method;
3467         int (*hf) (SSL *) = s->handshake_func;
3468 
3469         if (sm->version == meth->version)
3470             s->method = meth;
3471         else {
3472             sm->ssl_free(s);
3473             s->method = meth;
3474             ret = s->method->ssl_new(s);
3475         }
3476 
3477         if (hf == sm->ssl_connect)
3478             s->handshake_func = meth->ssl_connect;
3479         else if (hf == sm->ssl_accept)
3480             s->handshake_func = meth->ssl_accept;
3481     }
3482     return ret;
3483 }
3484 
3485 int SSL_get_error(const SSL *s, int i)
3486 {
3487     int reason;
3488     unsigned long l;
3489     BIO *bio;
3490 
3491     if (i > 0)
3492         return SSL_ERROR_NONE;
3493 
3494     /*
3495      * Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake etc,
3496      * where we do encode the error
3497      */
3498     if ((l = ERR_peek_error()) != 0) {
3499         if (ERR_GET_LIB(l) == ERR_LIB_SYS)
3500             return SSL_ERROR_SYSCALL;
3501         else
3502             return SSL_ERROR_SSL;
3503     }
3504 
3505     if (SSL_want_read(s)) {
3506         bio = SSL_get_rbio(s);
3507         if (BIO_should_read(bio))
3508             return SSL_ERROR_WANT_READ;
3509         else if (BIO_should_write(bio))
3510             /*
3511              * This one doesn't make too much sense ... We never try to write
3512              * to the rbio, and an application program where rbio and wbio
3513              * are separate couldn't even know what it should wait for.
3514              * However if we ever set s->rwstate incorrectly (so that we have
3515              * SSL_want_read(s) instead of SSL_want_write(s)) and rbio and
3516              * wbio *are* the same, this test works around that bug; so it
3517              * might be safer to keep it.
3518              */
3519             return SSL_ERROR_WANT_WRITE;
3520         else if (BIO_should_io_special(bio)) {
3521             reason = BIO_get_retry_reason(bio);
3522             if (reason == BIO_RR_CONNECT)
3523                 return SSL_ERROR_WANT_CONNECT;
3524             else if (reason == BIO_RR_ACCEPT)
3525                 return SSL_ERROR_WANT_ACCEPT;
3526             else
3527                 return SSL_ERROR_SYSCALL; /* unknown */
3528         }
3529     }
3530 
3531     if (SSL_want_write(s)) {
3532         /* Access wbio directly - in order to use the buffered bio if present */
3533         bio = s->wbio;
3534         if (BIO_should_write(bio))
3535             return SSL_ERROR_WANT_WRITE;
3536         else if (BIO_should_read(bio))
3537             /*
3538              * See above (SSL_want_read(s) with BIO_should_write(bio))
3539              */
3540             return SSL_ERROR_WANT_READ;
3541         else if (BIO_should_io_special(bio)) {
3542             reason = BIO_get_retry_reason(bio);
3543             if (reason == BIO_RR_CONNECT)
3544                 return SSL_ERROR_WANT_CONNECT;
3545             else if (reason == BIO_RR_ACCEPT)
3546                 return SSL_ERROR_WANT_ACCEPT;
3547             else
3548                 return SSL_ERROR_SYSCALL;
3549         }
3550     }
3551     if (SSL_want_x509_lookup(s))
3552         return SSL_ERROR_WANT_X509_LOOKUP;
3553     if (SSL_want_async(s))
3554         return SSL_ERROR_WANT_ASYNC;
3555     if (SSL_want_async_job(s))
3556         return SSL_ERROR_WANT_ASYNC_JOB;
3557     if (SSL_want_client_hello_cb(s))
3558         return SSL_ERROR_WANT_CLIENT_HELLO_CB;
3559 
3560     if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
3561         (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
3562         return SSL_ERROR_ZERO_RETURN;
3563 
3564     return SSL_ERROR_SYSCALL;
3565 }
3566 
3567 static int ssl_do_handshake_intern(void *vargs)
3568 {
3569     struct ssl_async_args *args;
3570     SSL *s;
3571 
3572     args = (struct ssl_async_args *)vargs;
3573     s = args->s;
3574 
3575     return s->handshake_func(s);
3576 }
3577 
3578 int SSL_do_handshake(SSL *s)
3579 {
3580     int ret = 1;
3581 
3582     if (s->handshake_func == NULL) {
3583         SSLerr(SSL_F_SSL_DO_HANDSHAKE, SSL_R_CONNECTION_TYPE_NOT_SET);
3584         return -1;
3585     }
3586 
3587     ossl_statem_check_finish_init(s, -1);
3588 
3589     s->method->ssl_renegotiate_check(s, 0);
3590 
3591     if (SSL_in_init(s) || SSL_in_before(s)) {
3592         if ((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
3593             struct ssl_async_args args;
3594 
3595             args.s = s;
3596 
3597             ret = ssl_start_async_job(s, &args, ssl_do_handshake_intern);
3598         } else {
3599             ret = s->handshake_func(s);
3600         }
3601     }
3602     return ret;
3603 }
3604 
3605 void SSL_set_accept_state(SSL *s)
3606 {
3607     s->server = 1;
3608     s->shutdown = 0;
3609     ossl_statem_clear(s);
3610     s->handshake_func = s->method->ssl_accept;
3611     clear_ciphers(s);
3612 }
3613 
3614 void SSL_set_connect_state(SSL *s)
3615 {
3616     s->server = 0;
3617     s->shutdown = 0;
3618     ossl_statem_clear(s);
3619     s->handshake_func = s->method->ssl_connect;
3620     clear_ciphers(s);
3621 }
3622 
3623 int ssl_undefined_function(SSL *s)
3624 {
3625     SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
3626     return 0;
3627 }
3628 
3629 int ssl_undefined_void_function(void)
3630 {
3631     SSLerr(SSL_F_SSL_UNDEFINED_VOID_FUNCTION,
3632            ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
3633     return 0;
3634 }
3635 
3636 int ssl_undefined_const_function(const SSL *s)
3637 {
3638     return 0;
3639 }
3640 
3641 const SSL_METHOD *ssl_bad_method(int ver)
3642 {
3643     SSLerr(SSL_F_SSL_BAD_METHOD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
3644     return NULL;
3645 }
3646 
3647 const char *ssl_protocol_to_string(int version)
3648 {
3649     switch(version)
3650     {
3651     case TLS1_3_VERSION:
3652         return "TLSv1.3";
3653 
3654     case TLS1_2_VERSION:
3655         return "TLSv1.2";
3656 
3657     case TLS1_1_VERSION:
3658         return "TLSv1.1";
3659 
3660     case TLS1_VERSION:
3661         return "TLSv1";
3662 
3663     case SSL3_VERSION:
3664         return "SSLv3";
3665 
3666     case DTLS1_BAD_VER:
3667         return "DTLSv0.9";
3668 
3669     case DTLS1_VERSION:
3670         return "DTLSv1";
3671 
3672     case DTLS1_2_VERSION:
3673         return "DTLSv1.2";
3674 
3675     default:
3676         return "unknown";
3677     }
3678 }
3679 
3680 const char *SSL_get_version(const SSL *s)
3681 {
3682     return ssl_protocol_to_string(s->version);
3683 }
3684 
3685 static int dup_ca_names(STACK_OF(X509_NAME) **dst, STACK_OF(X509_NAME) *src)
3686 {
3687     STACK_OF(X509_NAME) *sk;
3688     X509_NAME *xn;
3689     int i;
3690 
3691     if (src == NULL) {
3692         *dst = NULL;
3693         return 1;
3694     }
3695 
3696     if ((sk = sk_X509_NAME_new_null()) == NULL)
3697         return 0;
3698     for (i = 0; i < sk_X509_NAME_num(src); i++) {
3699         xn = X509_NAME_dup(sk_X509_NAME_value(src, i));
3700         if (xn == NULL) {
3701             sk_X509_NAME_pop_free(sk, X509_NAME_free);
3702             return 0;
3703         }
3704         if (sk_X509_NAME_insert(sk, xn, i) == 0) {
3705             X509_NAME_free(xn);
3706             sk_X509_NAME_pop_free(sk, X509_NAME_free);
3707             return 0;
3708         }
3709     }
3710     *dst = sk;
3711 
3712     return 1;
3713 }
3714 
3715 SSL *SSL_dup(SSL *s)
3716 {
3717     SSL *ret;
3718     int i;
3719 
3720     /* If we're not quiescent, just up_ref! */
3721     if (!SSL_in_init(s) || !SSL_in_before(s)) {
3722         CRYPTO_UP_REF(&s->references, &i, s->lock);
3723         return s;
3724     }
3725 
3726     /*
3727      * Otherwise, copy configuration state, and session if set.
3728      */
3729     if ((ret = SSL_new(SSL_get_SSL_CTX(s))) == NULL)
3730         return NULL;
3731 
3732     if (s->session != NULL) {
3733         /*
3734          * Arranges to share the same session via up_ref.  This "copies"
3735          * session-id, SSL_METHOD, sid_ctx, and 'cert'
3736          */
3737         if (!SSL_copy_session_id(ret, s))
3738             goto err;
3739     } else {
3740         /*
3741          * No session has been established yet, so we have to expect that
3742          * s->cert or ret->cert will be changed later -- they should not both
3743          * point to the same object, and thus we can't use
3744          * SSL_copy_session_id.
3745          */
3746         if (!SSL_set_ssl_method(ret, s->method))
3747             goto err;
3748 
3749         if (s->cert != NULL) {
3750             ssl_cert_free(ret->cert);
3751             ret->cert = ssl_cert_dup(s->cert);
3752             if (ret->cert == NULL)
3753                 goto err;
3754         }
3755 
3756         if (!SSL_set_session_id_context(ret, s->sid_ctx,
3757                                         (int)s->sid_ctx_length))
3758             goto err;
3759     }
3760 
3761     if (!ssl_dane_dup(ret, s))
3762         goto err;
3763     ret->version = s->version;
3764     ret->options = s->options;
3765     ret->mode = s->mode;
3766     SSL_set_max_cert_list(ret, SSL_get_max_cert_list(s));
3767     SSL_set_read_ahead(ret, SSL_get_read_ahead(s));
3768     ret->msg_callback = s->msg_callback;
3769     ret->msg_callback_arg = s->msg_callback_arg;
3770     SSL_set_verify(ret, SSL_get_verify_mode(s), SSL_get_verify_callback(s));
3771     SSL_set_verify_depth(ret, SSL_get_verify_depth(s));
3772     ret->generate_session_id = s->generate_session_id;
3773 
3774     SSL_set_info_callback(ret, SSL_get_info_callback(s));
3775 
3776     /* copy app data, a little dangerous perhaps */
3777     if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL, &ret->ex_data, &s->ex_data))
3778         goto err;
3779 
3780     /* setup rbio, and wbio */
3781     if (s->rbio != NULL) {
3782         if (!BIO_dup_state(s->rbio, (char *)&ret->rbio))
3783             goto err;
3784     }
3785     if (s->wbio != NULL) {
3786         if (s->wbio != s->rbio) {
3787             if (!BIO_dup_state(s->wbio, (char *)&ret->wbio))
3788                 goto err;
3789         } else {
3790             BIO_up_ref(ret->rbio);
3791             ret->wbio = ret->rbio;
3792         }
3793     }
3794 
3795     ret->server = s->server;
3796     if (s->handshake_func) {
3797         if (s->server)
3798             SSL_set_accept_state(ret);
3799         else
3800             SSL_set_connect_state(ret);
3801     }
3802     ret->shutdown = s->shutdown;
3803     ret->hit = s->hit;
3804 
3805     ret->default_passwd_callback = s->default_passwd_callback;
3806     ret->default_passwd_callback_userdata = s->default_passwd_callback_userdata;
3807 
3808     X509_VERIFY_PARAM_inherit(ret->param, s->param);
3809 
3810     /* dup the cipher_list and cipher_list_by_id stacks */
3811     if (s->cipher_list != NULL) {
3812         if ((ret->cipher_list = sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
3813             goto err;
3814     }
3815     if (s->cipher_list_by_id != NULL)
3816         if ((ret->cipher_list_by_id = sk_SSL_CIPHER_dup(s->cipher_list_by_id))
3817             == NULL)
3818             goto err;
3819 
3820     /* Dup the client_CA list */
3821     if (!dup_ca_names(&ret->ca_names, s->ca_names)
3822             || !dup_ca_names(&ret->client_ca_names, s->client_ca_names))
3823         goto err;
3824 
3825     return ret;
3826 
3827  err:
3828     SSL_free(ret);
3829     return NULL;
3830 }
3831 
3832 void ssl_clear_cipher_ctx(SSL *s)
3833 {
3834     if (s->enc_read_ctx != NULL) {
3835         EVP_CIPHER_CTX_free(s->enc_read_ctx);
3836         s->enc_read_ctx = NULL;
3837     }
3838     if (s->enc_write_ctx != NULL) {
3839         EVP_CIPHER_CTX_free(s->enc_write_ctx);
3840         s->enc_write_ctx = NULL;
3841     }
3842 #ifndef OPENSSL_NO_COMP
3843     COMP_CTX_free(s->expand);
3844     s->expand = NULL;
3845     COMP_CTX_free(s->compress);
3846     s->compress = NULL;
3847 #endif
3848 }
3849 
3850 X509 *SSL_get_certificate(const SSL *s)
3851 {
3852     if (s->cert != NULL)
3853         return s->cert->key->x509;
3854     else
3855         return NULL;
3856 }
3857 
3858 EVP_PKEY *SSL_get_privatekey(const SSL *s)
3859 {
3860     if (s->cert != NULL)
3861         return s->cert->key->privatekey;
3862     else
3863         return NULL;
3864 }
3865 
3866 X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx)
3867 {
3868     if (ctx->cert != NULL)
3869         return ctx->cert->key->x509;
3870     else
3871         return NULL;
3872 }
3873 
3874 EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx)
3875 {
3876     if (ctx->cert != NULL)
3877         return ctx->cert->key->privatekey;
3878     else
3879         return NULL;
3880 }
3881 
3882 const SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
3883 {
3884     if ((s->session != NULL) && (s->session->cipher != NULL))
3885         return s->session->cipher;
3886     return NULL;
3887 }
3888 
3889 const SSL_CIPHER *SSL_get_pending_cipher(const SSL *s)
3890 {
3891     return s->s3->tmp.new_cipher;
3892 }
3893 
3894 const COMP_METHOD *SSL_get_current_compression(const SSL *s)
3895 {
3896 #ifndef OPENSSL_NO_COMP
3897     return s->compress ? COMP_CTX_get_method(s->compress) : NULL;
3898 #else
3899     return NULL;
3900 #endif
3901 }
3902 
3903 const COMP_METHOD *SSL_get_current_expansion(const SSL *s)
3904 {
3905 #ifndef OPENSSL_NO_COMP
3906     return s->expand ? COMP_CTX_get_method(s->expand) : NULL;
3907 #else
3908     return NULL;
3909 #endif
3910 }
3911 
3912 int ssl_init_wbio_buffer(SSL *s)
3913 {
3914     BIO *bbio;
3915 
3916     if (s->bbio != NULL) {
3917         /* Already buffered. */
3918         return 1;
3919     }
3920 
3921     bbio = BIO_new(BIO_f_buffer());
3922     if (bbio == NULL || !BIO_set_read_buffer_size(bbio, 1)) {
3923         BIO_free(bbio);
3924         SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER, ERR_R_BUF_LIB);
3925         return 0;
3926     }
3927     s->bbio = bbio;
3928     s->wbio = BIO_push(bbio, s->wbio);
3929 
3930     return 1;
3931 }
3932 
3933 int ssl_free_wbio_buffer(SSL *s)
3934 {
3935     /* callers ensure s is never null */
3936     if (s->bbio == NULL)
3937         return 1;
3938 
3939     s->wbio = BIO_pop(s->wbio);
3940     BIO_free(s->bbio);
3941     s->bbio = NULL;
3942 
3943     return 1;
3944 }
3945 
3946 void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode)
3947 {
3948     ctx->quiet_shutdown = mode;
3949 }
3950 
3951 int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx)
3952 {
3953     return ctx->quiet_shutdown;
3954 }
3955 
3956 void SSL_set_quiet_shutdown(SSL *s, int mode)
3957 {
3958     s->quiet_shutdown = mode;
3959 }
3960 
3961 int SSL_get_quiet_shutdown(const SSL *s)
3962 {
3963     return s->quiet_shutdown;
3964 }
3965 
3966 void SSL_set_shutdown(SSL *s, int mode)
3967 {
3968     s->shutdown = mode;
3969 }
3970 
3971 int SSL_get_shutdown(const SSL *s)
3972 {
3973     return s->shutdown;
3974 }
3975 
3976 int SSL_version(const SSL *s)
3977 {
3978     return s->version;
3979 }
3980 
3981 int SSL_client_version(const SSL *s)
3982 {
3983     return s->client_version;
3984 }
3985 
3986 SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
3987 {
3988     return ssl->ctx;
3989 }
3990 
3991 SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx)
3992 {
3993     CERT *new_cert;
3994     if (ssl->ctx == ctx)
3995         return ssl->ctx;
3996     if (ctx == NULL)
3997         ctx = ssl->session_ctx;
3998     new_cert = ssl_cert_dup(ctx->cert);
3999     if (new_cert == NULL) {
4000         return NULL;
4001     }
4002 
4003     if (!custom_exts_copy_flags(&new_cert->custext, &ssl->cert->custext)) {
4004         ssl_cert_free(new_cert);
4005         return NULL;
4006     }
4007 
4008     ssl_cert_free(ssl->cert);
4009     ssl->cert = new_cert;
4010 
4011     /*
4012      * Program invariant: |sid_ctx| has fixed size (SSL_MAX_SID_CTX_LENGTH),
4013      * so setter APIs must prevent invalid lengths from entering the system.
4014      */
4015     if (!ossl_assert(ssl->sid_ctx_length <= sizeof(ssl->sid_ctx)))
4016         return NULL;
4017 
4018     /*
4019      * If the session ID context matches that of the parent SSL_CTX,
4020      * inherit it from the new SSL_CTX as well. If however the context does
4021      * not match (i.e., it was set per-ssl with SSL_set_session_id_context),
4022      * leave it unchanged.
4023      */
4024     if ((ssl->ctx != NULL) &&
4025         (ssl->sid_ctx_length == ssl->ctx->sid_ctx_length) &&
4026         (memcmp(ssl->sid_ctx, ssl->ctx->sid_ctx, ssl->sid_ctx_length) == 0)) {
4027         ssl->sid_ctx_length = ctx->sid_ctx_length;
4028         memcpy(&ssl->sid_ctx, &ctx->sid_ctx, sizeof(ssl->sid_ctx));
4029     }
4030 
4031     SSL_CTX_up_ref(ctx);
4032     SSL_CTX_free(ssl->ctx);     /* decrement reference count */
4033     ssl->ctx = ctx;
4034 
4035     return ssl->ctx;
4036 }
4037 
4038 int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
4039 {
4040     return X509_STORE_set_default_paths(ctx->cert_store);
4041 }
4042 
4043 int SSL_CTX_set_default_verify_dir(SSL_CTX *ctx)
4044 {
4045     X509_LOOKUP *lookup;
4046 
4047     lookup = X509_STORE_add_lookup(ctx->cert_store, X509_LOOKUP_hash_dir());
4048     if (lookup == NULL)
4049         return 0;
4050     X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
4051 
4052     /* Clear any errors if the default directory does not exist */
4053     ERR_clear_error();
4054 
4055     return 1;
4056 }
4057 
4058 int SSL_CTX_set_default_verify_file(SSL_CTX *ctx)
4059 {
4060     X509_LOOKUP *lookup;
4061 
4062     lookup = X509_STORE_add_lookup(ctx->cert_store, X509_LOOKUP_file());
4063     if (lookup == NULL)
4064         return 0;
4065 
4066     X509_LOOKUP_load_file(lookup, NULL, X509_FILETYPE_DEFAULT);
4067 
4068     /* Clear any errors if the default file does not exist */
4069     ERR_clear_error();
4070 
4071     return 1;
4072 }
4073 
4074 int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
4075                                   const char *CApath)
4076 {
4077     return X509_STORE_load_locations(ctx->cert_store, CAfile, CApath);
4078 }
4079 
4080 void SSL_set_info_callback(SSL *ssl,
4081                            void (*cb) (const SSL *ssl, int type, int val))
4082 {
4083     ssl->info_callback = cb;
4084 }
4085 
4086 /*
4087  * One compiler (Diab DCC) doesn't like argument names in returned function
4088  * pointer.
4089  */
4090 void (*SSL_get_info_callback(const SSL *ssl)) (const SSL * /* ssl */ ,
4091                                                int /* type */ ,
4092                                                int /* val */ ) {
4093     return ssl->info_callback;
4094 }
4095 
4096 void SSL_set_verify_result(SSL *ssl, long arg)
4097 {
4098     ssl->verify_result = arg;
4099 }
4100 
4101 long SSL_get_verify_result(const SSL *ssl)
4102 {
4103     return ssl->verify_result;
4104 }
4105 
4106 size_t SSL_get_client_random(const SSL *ssl, unsigned char *out, size_t outlen)
4107 {
4108     if (outlen == 0)
4109         return sizeof(ssl->s3->client_random);
4110     if (outlen > sizeof(ssl->s3->client_random))
4111         outlen = sizeof(ssl->s3->client_random);
4112     memcpy(out, ssl->s3->client_random, outlen);
4113     return outlen;
4114 }
4115 
4116 size_t SSL_get_server_random(const SSL *ssl, unsigned char *out, size_t outlen)
4117 {
4118     if (outlen == 0)
4119         return sizeof(ssl->s3->server_random);
4120     if (outlen > sizeof(ssl->s3->server_random))
4121         outlen = sizeof(ssl->s3->server_random);
4122     memcpy(out, ssl->s3->server_random, outlen);
4123     return outlen;
4124 }
4125 
4126 size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
4127                                   unsigned char *out, size_t outlen)
4128 {
4129     if (outlen == 0)
4130         return session->master_key_length;
4131     if (outlen > session->master_key_length)
4132         outlen = session->master_key_length;
4133     memcpy(out, session->master_key, outlen);
4134     return outlen;
4135 }
4136 
4137 int SSL_SESSION_set1_master_key(SSL_SESSION *sess, const unsigned char *in,
4138                                 size_t len)
4139 {
4140     if (len > sizeof(sess->master_key))
4141         return 0;
4142 
4143     memcpy(sess->master_key, in, len);
4144     sess->master_key_length = len;
4145     return 1;
4146 }
4147 
4148 
4149 int SSL_set_ex_data(SSL *s, int idx, void *arg)
4150 {
4151     return CRYPTO_set_ex_data(&s->ex_data, idx, arg);
4152 }
4153 
4154 void *SSL_get_ex_data(const SSL *s, int idx)
4155 {
4156     return CRYPTO_get_ex_data(&s->ex_data, idx);
4157 }
4158 
4159 int SSL_CTX_set_ex_data(SSL_CTX *s, int idx, void *arg)
4160 {
4161     return CRYPTO_set_ex_data(&s->ex_data, idx, arg);
4162 }
4163 
4164 void *SSL_CTX_get_ex_data(const SSL_CTX *s, int idx)
4165 {
4166     return CRYPTO_get_ex_data(&s->ex_data, idx);
4167 }
4168 
4169 X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx)
4170 {
4171     return ctx->cert_store;
4172 }
4173 
4174 void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store)
4175 {
4176     X509_STORE_free(ctx->cert_store);
4177     ctx->cert_store = store;
4178 }
4179 
4180 void SSL_CTX_set1_cert_store(SSL_CTX *ctx, X509_STORE *store)
4181 {
4182     if (store != NULL)
4183         X509_STORE_up_ref(store);
4184     SSL_CTX_set_cert_store(ctx, store);
4185 }
4186 
4187 int SSL_want(const SSL *s)
4188 {
4189     return s->rwstate;
4190 }
4191 
4192 /**
4193  * \brief Set the callback for generating temporary DH keys.
4194  * \param ctx the SSL context.
4195  * \param dh the callback
4196  */
4197 
4198 #ifndef OPENSSL_NO_DH
4199 void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,
4200                                  DH *(*dh) (SSL *ssl, int is_export,
4201                                             int keylength))
4202 {
4203     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
4204 }
4205 
4206 void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,
4207                                                   int keylength))
4208 {
4209     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
4210 }
4211 #endif
4212 
4213 #ifndef OPENSSL_NO_PSK
4214 int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
4215 {
4216     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
4217         SSLerr(SSL_F_SSL_CTX_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
4218         return 0;
4219     }
4220     OPENSSL_free(ctx->cert->psk_identity_hint);
4221     if (identity_hint != NULL) {
4222         ctx->cert->psk_identity_hint = OPENSSL_strdup(identity_hint);
4223         if (ctx->cert->psk_identity_hint == NULL)
4224             return 0;
4225     } else
4226         ctx->cert->psk_identity_hint = NULL;
4227     return 1;
4228 }
4229 
4230 int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint)
4231 {
4232     if (s == NULL)
4233         return 0;
4234 
4235     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
4236         SSLerr(SSL_F_SSL_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
4237         return 0;
4238     }
4239     OPENSSL_free(s->cert->psk_identity_hint);
4240     if (identity_hint != NULL) {
4241         s->cert->psk_identity_hint = OPENSSL_strdup(identity_hint);
4242         if (s->cert->psk_identity_hint == NULL)
4243             return 0;
4244     } else
4245         s->cert->psk_identity_hint = NULL;
4246     return 1;
4247 }
4248 
4249 const char *SSL_get_psk_identity_hint(const SSL *s)
4250 {
4251     if (s == NULL || s->session == NULL)
4252         return NULL;
4253     return s->session->psk_identity_hint;
4254 }
4255 
4256 const char *SSL_get_psk_identity(const SSL *s)
4257 {
4258     if (s == NULL || s->session == NULL)
4259         return NULL;
4260     return s->session->psk_identity;
4261 }
4262 
4263 void SSL_set_psk_client_callback(SSL *s, SSL_psk_client_cb_func cb)
4264 {
4265     s->psk_client_callback = cb;
4266 }
4267 
4268 void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx, SSL_psk_client_cb_func cb)
4269 {
4270     ctx->psk_client_callback = cb;
4271 }
4272 
4273 void SSL_set_psk_server_callback(SSL *s, SSL_psk_server_cb_func cb)
4274 {
4275     s->psk_server_callback = cb;
4276 }
4277 
4278 void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx, SSL_psk_server_cb_func cb)
4279 {
4280     ctx->psk_server_callback = cb;
4281 }
4282 #endif
4283 
4284 void SSL_set_psk_find_session_callback(SSL *s, SSL_psk_find_session_cb_func cb)
4285 {
4286     s->psk_find_session_cb = cb;
4287 }
4288 
4289 void SSL_CTX_set_psk_find_session_callback(SSL_CTX *ctx,
4290                                            SSL_psk_find_session_cb_func cb)
4291 {
4292     ctx->psk_find_session_cb = cb;
4293 }
4294 
4295 void SSL_set_psk_use_session_callback(SSL *s, SSL_psk_use_session_cb_func cb)
4296 {
4297     s->psk_use_session_cb = cb;
4298 }
4299 
4300 void SSL_CTX_set_psk_use_session_callback(SSL_CTX *ctx,
4301                                            SSL_psk_use_session_cb_func cb)
4302 {
4303     ctx->psk_use_session_cb = cb;
4304 }
4305 
4306 void SSL_CTX_set_msg_callback(SSL_CTX *ctx,
4307                               void (*cb) (int write_p, int version,
4308                                           int content_type, const void *buf,
4309                                           size_t len, SSL *ssl, void *arg))
4310 {
4311     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
4312 }
4313 
4314 void SSL_set_msg_callback(SSL *ssl,
4315                           void (*cb) (int write_p, int version,
4316                                       int content_type, const void *buf,
4317                                       size_t len, SSL *ssl, void *arg))
4318 {
4319     SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
4320 }
4321 
4322 void SSL_CTX_set_not_resumable_session_callback(SSL_CTX *ctx,
4323                                                 int (*cb) (SSL *ssl,
4324                                                            int
4325                                                            is_forward_secure))
4326 {
4327     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
4328                           (void (*)(void))cb);
4329 }
4330 
4331 void SSL_set_not_resumable_session_callback(SSL *ssl,
4332                                             int (*cb) (SSL *ssl,
4333                                                        int is_forward_secure))
4334 {
4335     SSL_callback_ctrl(ssl, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
4336                       (void (*)(void))cb);
4337 }
4338 
4339 void SSL_CTX_set_record_padding_callback(SSL_CTX *ctx,
4340                                          size_t (*cb) (SSL *ssl, int type,
4341                                                        size_t len, void *arg))
4342 {
4343     ctx->record_padding_cb = cb;
4344 }
4345 
4346 void SSL_CTX_set_record_padding_callback_arg(SSL_CTX *ctx, void *arg)
4347 {
4348     ctx->record_padding_arg = arg;
4349 }
4350 
4351 void *SSL_CTX_get_record_padding_callback_arg(const SSL_CTX *ctx)
4352 {
4353     return ctx->record_padding_arg;
4354 }
4355 
4356 int SSL_CTX_set_block_padding(SSL_CTX *ctx, size_t block_size)
4357 {
4358     /* block size of 0 or 1 is basically no padding */
4359     if (block_size == 1)
4360         ctx->block_padding = 0;
4361     else if (block_size <= SSL3_RT_MAX_PLAIN_LENGTH)
4362         ctx->block_padding = block_size;
4363     else
4364         return 0;
4365     return 1;
4366 }
4367 
4368 void SSL_set_record_padding_callback(SSL *ssl,
4369                                      size_t (*cb) (SSL *ssl, int type,
4370                                                    size_t len, void *arg))
4371 {
4372     ssl->record_padding_cb = cb;
4373 }
4374 
4375 void SSL_set_record_padding_callback_arg(SSL *ssl, void *arg)
4376 {
4377     ssl->record_padding_arg = arg;
4378 }
4379 
4380 void *SSL_get_record_padding_callback_arg(const SSL *ssl)
4381 {
4382     return ssl->record_padding_arg;
4383 }
4384 
4385 int SSL_set_block_padding(SSL *ssl, size_t block_size)
4386 {
4387     /* block size of 0 or 1 is basically no padding */
4388     if (block_size == 1)
4389         ssl->block_padding = 0;
4390     else if (block_size <= SSL3_RT_MAX_PLAIN_LENGTH)
4391         ssl->block_padding = block_size;
4392     else
4393         return 0;
4394     return 1;
4395 }
4396 
4397 int SSL_set_num_tickets(SSL *s, size_t num_tickets)
4398 {
4399     s->num_tickets = num_tickets;
4400 
4401     return 1;
4402 }
4403 
4404 size_t SSL_get_num_tickets(const SSL *s)
4405 {
4406     return s->num_tickets;
4407 }
4408 
4409 int SSL_CTX_set_num_tickets(SSL_CTX *ctx, size_t num_tickets)
4410 {
4411     ctx->num_tickets = num_tickets;
4412 
4413     return 1;
4414 }
4415 
4416 size_t SSL_CTX_get_num_tickets(const SSL_CTX *ctx)
4417 {
4418     return ctx->num_tickets;
4419 }
4420 
4421 /*
4422  * Allocates new EVP_MD_CTX and sets pointer to it into given pointer
4423  * variable, freeing EVP_MD_CTX previously stored in that variable, if any.
4424  * If EVP_MD pointer is passed, initializes ctx with this |md|.
4425  * Returns the newly allocated ctx;
4426  */
4427 
4428 EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md)
4429 {
4430     ssl_clear_hash_ctx(hash);
4431     *hash = EVP_MD_CTX_new();
4432     if (*hash == NULL || (md && EVP_DigestInit_ex(*hash, md, NULL) <= 0)) {
4433         EVP_MD_CTX_free(*hash);
4434         *hash = NULL;
4435         return NULL;
4436     }
4437     return *hash;
4438 }
4439 
4440 void ssl_clear_hash_ctx(EVP_MD_CTX **hash)
4441 {
4442 
4443     EVP_MD_CTX_free(*hash);
4444     *hash = NULL;
4445 }
4446 
4447 /* Retrieve handshake hashes */
4448 int ssl_handshake_hash(SSL *s, unsigned char *out, size_t outlen,
4449                        size_t *hashlen)
4450 {
4451     EVP_MD_CTX *ctx = NULL;
4452     EVP_MD_CTX *hdgst = s->s3->handshake_dgst;
4453     int hashleni = EVP_MD_CTX_size(hdgst);
4454     int ret = 0;
4455 
4456     if (hashleni < 0 || (size_t)hashleni > outlen) {
4457         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_HANDSHAKE_HASH,
4458                  ERR_R_INTERNAL_ERROR);
4459         goto err;
4460     }
4461 
4462     ctx = EVP_MD_CTX_new();
4463     if (ctx == NULL)
4464         goto err;
4465 
4466     if (!EVP_MD_CTX_copy_ex(ctx, hdgst)
4467         || EVP_DigestFinal_ex(ctx, out, NULL) <= 0) {
4468         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_HANDSHAKE_HASH,
4469                  ERR_R_INTERNAL_ERROR);
4470         goto err;
4471     }
4472 
4473     *hashlen = hashleni;
4474 
4475     ret = 1;
4476  err:
4477     EVP_MD_CTX_free(ctx);
4478     return ret;
4479 }
4480 
4481 int SSL_session_reused(const SSL *s)
4482 {
4483     return s->hit;
4484 }
4485 
4486 int SSL_is_server(const SSL *s)
4487 {
4488     return s->server;
4489 }
4490 
4491 #if OPENSSL_API_COMPAT < 0x10100000L
4492 void SSL_set_debug(SSL *s, int debug)
4493 {
4494     /* Old function was do-nothing anyway... */
4495     (void)s;
4496     (void)debug;
4497 }
4498 #endif
4499 
4500 void SSL_set_security_level(SSL *s, int level)
4501 {
4502     s->cert->sec_level = level;
4503 }
4504 
4505 int SSL_get_security_level(const SSL *s)
4506 {
4507     return s->cert->sec_level;
4508 }
4509 
4510 void SSL_set_security_callback(SSL *s,
4511                                int (*cb) (const SSL *s, const SSL_CTX *ctx,
4512                                           int op, int bits, int nid,
4513                                           void *other, void *ex))
4514 {
4515     s->cert->sec_cb = cb;
4516 }
4517 
4518 int (*SSL_get_security_callback(const SSL *s)) (const SSL *s,
4519                                                 const SSL_CTX *ctx, int op,
4520                                                 int bits, int nid, void *other,
4521                                                 void *ex) {
4522     return s->cert->sec_cb;
4523 }
4524 
4525 void SSL_set0_security_ex_data(SSL *s, void *ex)
4526 {
4527     s->cert->sec_ex = ex;
4528 }
4529 
4530 void *SSL_get0_security_ex_data(const SSL *s)
4531 {
4532     return s->cert->sec_ex;
4533 }
4534 
4535 void SSL_CTX_set_security_level(SSL_CTX *ctx, int level)
4536 {
4537     ctx->cert->sec_level = level;
4538 }
4539 
4540 int SSL_CTX_get_security_level(const SSL_CTX *ctx)
4541 {
4542     return ctx->cert->sec_level;
4543 }
4544 
4545 void SSL_CTX_set_security_callback(SSL_CTX *ctx,
4546                                    int (*cb) (const SSL *s, const SSL_CTX *ctx,
4547                                               int op, int bits, int nid,
4548                                               void *other, void *ex))
4549 {
4550     ctx->cert->sec_cb = cb;
4551 }
4552 
4553 int (*SSL_CTX_get_security_callback(const SSL_CTX *ctx)) (const SSL *s,
4554                                                           const SSL_CTX *ctx,
4555                                                           int op, int bits,
4556                                                           int nid,
4557                                                           void *other,
4558                                                           void *ex) {
4559     return ctx->cert->sec_cb;
4560 }
4561 
4562 void SSL_CTX_set0_security_ex_data(SSL_CTX *ctx, void *ex)
4563 {
4564     ctx->cert->sec_ex = ex;
4565 }
4566 
4567 void *SSL_CTX_get0_security_ex_data(const SSL_CTX *ctx)
4568 {
4569     return ctx->cert->sec_ex;
4570 }
4571 
4572 /*
4573  * Get/Set/Clear options in SSL_CTX or SSL, formerly macros, now functions that
4574  * can return unsigned long, instead of the generic long return value from the
4575  * control interface.
4576  */
4577 unsigned long SSL_CTX_get_options(const SSL_CTX *ctx)
4578 {
4579     return ctx->options;
4580 }
4581 
4582 unsigned long SSL_get_options(const SSL *s)
4583 {
4584     return s->options;
4585 }
4586 
4587 unsigned long SSL_CTX_set_options(SSL_CTX *ctx, unsigned long op)
4588 {
4589     return ctx->options |= op;
4590 }
4591 
4592 unsigned long SSL_set_options(SSL *s, unsigned long op)
4593 {
4594     return s->options |= op;
4595 }
4596 
4597 unsigned long SSL_CTX_clear_options(SSL_CTX *ctx, unsigned long op)
4598 {
4599     return ctx->options &= ~op;
4600 }
4601 
4602 unsigned long SSL_clear_options(SSL *s, unsigned long op)
4603 {
4604     return s->options &= ~op;
4605 }
4606 
4607 STACK_OF(X509) *SSL_get0_verified_chain(const SSL *s)
4608 {
4609     return s->verified_chain;
4610 }
4611 
4612 IMPLEMENT_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id);
4613 
4614 #ifndef OPENSSL_NO_CT
4615 
4616 /*
4617  * Moves SCTs from the |src| stack to the |dst| stack.
4618  * The source of each SCT will be set to |origin|.
4619  * If |dst| points to a NULL pointer, a new stack will be created and owned by
4620  * the caller.
4621  * Returns the number of SCTs moved, or a negative integer if an error occurs.
4622  */
4623 static int ct_move_scts(STACK_OF(SCT) **dst, STACK_OF(SCT) *src,
4624                         sct_source_t origin)
4625 {
4626     int scts_moved = 0;
4627     SCT *sct = NULL;
4628 
4629     if (*dst == NULL) {
4630         *dst = sk_SCT_new_null();
4631         if (*dst == NULL) {
4632             SSLerr(SSL_F_CT_MOVE_SCTS, ERR_R_MALLOC_FAILURE);
4633             goto err;
4634         }
4635     }
4636 
4637     while ((sct = sk_SCT_pop(src)) != NULL) {
4638         if (SCT_set_source(sct, origin) != 1)
4639             goto err;
4640 
4641         if (sk_SCT_push(*dst, sct) <= 0)
4642             goto err;
4643         scts_moved += 1;
4644     }
4645 
4646     return scts_moved;
4647  err:
4648     if (sct != NULL)
4649         sk_SCT_push(src, sct);  /* Put the SCT back */
4650     return -1;
4651 }
4652 
4653 /*
4654  * Look for data collected during ServerHello and parse if found.
4655  * Returns the number of SCTs extracted.
4656  */
4657 static int ct_extract_tls_extension_scts(SSL *s)
4658 {
4659     int scts_extracted = 0;
4660 
4661     if (s->ext.scts != NULL) {
4662         const unsigned char *p = s->ext.scts;
4663         STACK_OF(SCT) *scts = o2i_SCT_LIST(NULL, &p, s->ext.scts_len);
4664 
4665         scts_extracted = ct_move_scts(&s->scts, scts, SCT_SOURCE_TLS_EXTENSION);
4666 
4667         SCT_LIST_free(scts);
4668     }
4669 
4670     return scts_extracted;
4671 }
4672 
4673 /*
4674  * Checks for an OCSP response and then attempts to extract any SCTs found if it
4675  * contains an SCT X509 extension. They will be stored in |s->scts|.
4676  * Returns:
4677  * - The number of SCTs extracted, assuming an OCSP response exists.
4678  * - 0 if no OCSP response exists or it contains no SCTs.
4679  * - A negative integer if an error occurs.
4680  */
4681 static int ct_extract_ocsp_response_scts(SSL *s)
4682 {
4683 # ifndef OPENSSL_NO_OCSP
4684     int scts_extracted = 0;
4685     const unsigned char *p;
4686     OCSP_BASICRESP *br = NULL;
4687     OCSP_RESPONSE *rsp = NULL;
4688     STACK_OF(SCT) *scts = NULL;
4689     int i;
4690 
4691     if (s->ext.ocsp.resp == NULL || s->ext.ocsp.resp_len == 0)
4692         goto err;
4693 
4694     p = s->ext.ocsp.resp;
4695     rsp = d2i_OCSP_RESPONSE(NULL, &p, (int)s->ext.ocsp.resp_len);
4696     if (rsp == NULL)
4697         goto err;
4698 
4699     br = OCSP_response_get1_basic(rsp);
4700     if (br == NULL)
4701         goto err;
4702 
4703     for (i = 0; i < OCSP_resp_count(br); ++i) {
4704         OCSP_SINGLERESP *single = OCSP_resp_get0(br, i);
4705 
4706         if (single == NULL)
4707             continue;
4708 
4709         scts =
4710             OCSP_SINGLERESP_get1_ext_d2i(single, NID_ct_cert_scts, NULL, NULL);
4711         scts_extracted =
4712             ct_move_scts(&s->scts, scts, SCT_SOURCE_OCSP_STAPLED_RESPONSE);
4713         if (scts_extracted < 0)
4714             goto err;
4715     }
4716  err:
4717     SCT_LIST_free(scts);
4718     OCSP_BASICRESP_free(br);
4719     OCSP_RESPONSE_free(rsp);
4720     return scts_extracted;
4721 # else
4722     /* Behave as if no OCSP response exists */
4723     return 0;
4724 # endif
4725 }
4726 
4727 /*
4728  * Attempts to extract SCTs from the peer certificate.
4729  * Return the number of SCTs extracted, or a negative integer if an error
4730  * occurs.
4731  */
4732 static int ct_extract_x509v3_extension_scts(SSL *s)
4733 {
4734     int scts_extracted = 0;
4735     X509 *cert = s->session != NULL ? s->session->peer : NULL;
4736 
4737     if (cert != NULL) {
4738         STACK_OF(SCT) *scts =
4739             X509_get_ext_d2i(cert, NID_ct_precert_scts, NULL, NULL);
4740 
4741         scts_extracted =
4742             ct_move_scts(&s->scts, scts, SCT_SOURCE_X509V3_EXTENSION);
4743 
4744         SCT_LIST_free(scts);
4745     }
4746 
4747     return scts_extracted;
4748 }
4749 
4750 /*
4751  * Attempts to find all received SCTs by checking TLS extensions, the OCSP
4752  * response (if it exists) and X509v3 extensions in the certificate.
4753  * Returns NULL if an error occurs.
4754  */
4755 const STACK_OF(SCT) *SSL_get0_peer_scts(SSL *s)
4756 {
4757     if (!s->scts_parsed) {
4758         if (ct_extract_tls_extension_scts(s) < 0 ||
4759             ct_extract_ocsp_response_scts(s) < 0 ||
4760             ct_extract_x509v3_extension_scts(s) < 0)
4761             goto err;
4762 
4763         s->scts_parsed = 1;
4764     }
4765     return s->scts;
4766  err:
4767     return NULL;
4768 }
4769 
4770 static int ct_permissive(const CT_POLICY_EVAL_CTX * ctx,
4771                          const STACK_OF(SCT) *scts, void *unused_arg)
4772 {
4773     return 1;
4774 }
4775 
4776 static int ct_strict(const CT_POLICY_EVAL_CTX * ctx,
4777                      const STACK_OF(SCT) *scts, void *unused_arg)
4778 {
4779     int count = scts != NULL ? sk_SCT_num(scts) : 0;
4780     int i;
4781 
4782     for (i = 0; i < count; ++i) {
4783         SCT *sct = sk_SCT_value(scts, i);
4784         int status = SCT_get_validation_status(sct);
4785 
4786         if (status == SCT_VALIDATION_STATUS_VALID)
4787             return 1;
4788     }
4789     SSLerr(SSL_F_CT_STRICT, SSL_R_NO_VALID_SCTS);
4790     return 0;
4791 }
4792 
4793 int SSL_set_ct_validation_callback(SSL *s, ssl_ct_validation_cb callback,
4794                                    void *arg)
4795 {
4796     /*
4797      * Since code exists that uses the custom extension handler for CT, look
4798      * for this and throw an error if they have already registered to use CT.
4799      */
4800     if (callback != NULL && SSL_CTX_has_client_custom_ext(s->ctx,
4801                                                           TLSEXT_TYPE_signed_certificate_timestamp))
4802     {
4803         SSLerr(SSL_F_SSL_SET_CT_VALIDATION_CALLBACK,
4804                SSL_R_CUSTOM_EXT_HANDLER_ALREADY_INSTALLED);
4805         return 0;
4806     }
4807 
4808     if (callback != NULL) {
4809         /*
4810          * If we are validating CT, then we MUST accept SCTs served via OCSP
4811          */
4812         if (!SSL_set_tlsext_status_type(s, TLSEXT_STATUSTYPE_ocsp))
4813             return 0;
4814     }
4815 
4816     s->ct_validation_callback = callback;
4817     s->ct_validation_callback_arg = arg;
4818 
4819     return 1;
4820 }
4821 
4822 int SSL_CTX_set_ct_validation_callback(SSL_CTX *ctx,
4823                                        ssl_ct_validation_cb callback, void *arg)
4824 {
4825     /*
4826      * Since code exists that uses the custom extension handler for CT, look for
4827      * this and throw an error if they have already registered to use CT.
4828      */
4829     if (callback != NULL && SSL_CTX_has_client_custom_ext(ctx,
4830                                                           TLSEXT_TYPE_signed_certificate_timestamp))
4831     {
4832         SSLerr(SSL_F_SSL_CTX_SET_CT_VALIDATION_CALLBACK,
4833                SSL_R_CUSTOM_EXT_HANDLER_ALREADY_INSTALLED);
4834         return 0;
4835     }
4836 
4837     ctx->ct_validation_callback = callback;
4838     ctx->ct_validation_callback_arg = arg;
4839     return 1;
4840 }
4841 
4842 int SSL_ct_is_enabled(const SSL *s)
4843 {
4844     return s->ct_validation_callback != NULL;
4845 }
4846 
4847 int SSL_CTX_ct_is_enabled(const SSL_CTX *ctx)
4848 {
4849     return ctx->ct_validation_callback != NULL;
4850 }
4851 
4852 int ssl_validate_ct(SSL *s)
4853 {
4854     int ret = 0;
4855     X509 *cert = s->session != NULL ? s->session->peer : NULL;
4856     X509 *issuer;
4857     SSL_DANE *dane = &s->dane;
4858     CT_POLICY_EVAL_CTX *ctx = NULL;
4859     const STACK_OF(SCT) *scts;
4860 
4861     /*
4862      * If no callback is set, the peer is anonymous, or its chain is invalid,
4863      * skip SCT validation - just return success.  Applications that continue
4864      * handshakes without certificates, with unverified chains, or pinned leaf
4865      * certificates are outside the scope of the WebPKI and CT.
4866      *
4867      * The above exclusions notwithstanding the vast majority of peers will
4868      * have rather ordinary certificate chains validated by typical
4869      * applications that perform certificate verification and therefore will
4870      * process SCTs when enabled.
4871      */
4872     if (s->ct_validation_callback == NULL || cert == NULL ||
4873         s->verify_result != X509_V_OK ||
4874         s->verified_chain == NULL || sk_X509_num(s->verified_chain) <= 1)
4875         return 1;
4876 
4877     /*
4878      * CT not applicable for chains validated via DANE-TA(2) or DANE-EE(3)
4879      * trust-anchors.  See https://tools.ietf.org/html/rfc7671#section-4.2
4880      */
4881     if (DANETLS_ENABLED(dane) && dane->mtlsa != NULL) {
4882         switch (dane->mtlsa->usage) {
4883         case DANETLS_USAGE_DANE_TA:
4884         case DANETLS_USAGE_DANE_EE:
4885             return 1;
4886         }
4887     }
4888 
4889     ctx = CT_POLICY_EVAL_CTX_new();
4890     if (ctx == NULL) {
4891         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_VALIDATE_CT,
4892                  ERR_R_MALLOC_FAILURE);
4893         goto end;
4894     }
4895 
4896     issuer = sk_X509_value(s->verified_chain, 1);
4897     CT_POLICY_EVAL_CTX_set1_cert(ctx, cert);
4898     CT_POLICY_EVAL_CTX_set1_issuer(ctx, issuer);
4899     CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(ctx, s->ctx->ctlog_store);
4900     CT_POLICY_EVAL_CTX_set_time(
4901             ctx, (uint64_t)SSL_SESSION_get_time(SSL_get0_session(s)) * 1000);
4902 
4903     scts = SSL_get0_peer_scts(s);
4904 
4905     /*
4906      * This function returns success (> 0) only when all the SCTs are valid, 0
4907      * when some are invalid, and < 0 on various internal errors (out of
4908      * memory, etc.).  Having some, or even all, invalid SCTs is not sufficient
4909      * reason to abort the handshake, that decision is up to the callback.
4910      * Therefore, we error out only in the unexpected case that the return
4911      * value is negative.
4912      *
4913      * XXX: One might well argue that the return value of this function is an
4914      * unfortunate design choice.  Its job is only to determine the validation
4915      * status of each of the provided SCTs.  So long as it correctly separates
4916      * the wheat from the chaff it should return success.  Failure in this case
4917      * ought to correspond to an inability to carry out its duties.
4918      */
4919     if (SCT_LIST_validate(scts, ctx) < 0) {
4920         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_SSL_VALIDATE_CT,
4921                  SSL_R_SCT_VERIFICATION_FAILED);
4922         goto end;
4923     }
4924 
4925     ret = s->ct_validation_callback(ctx, scts, s->ct_validation_callback_arg);
4926     if (ret < 0)
4927         ret = 0;                /* This function returns 0 on failure */
4928     if (!ret)
4929         SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_SSL_VALIDATE_CT,
4930                  SSL_R_CALLBACK_FAILED);
4931 
4932  end:
4933     CT_POLICY_EVAL_CTX_free(ctx);
4934     /*
4935      * With SSL_VERIFY_NONE the session may be cached and re-used despite a
4936      * failure return code here.  Also the application may wish the complete
4937      * the handshake, and then disconnect cleanly at a higher layer, after
4938      * checking the verification status of the completed connection.
4939      *
4940      * We therefore force a certificate verification failure which will be
4941      * visible via SSL_get_verify_result() and cached as part of any resumed
4942      * session.
4943      *
4944      * Note: the permissive callback is for information gathering only, always
4945      * returns success, and does not affect verification status.  Only the
4946      * strict callback or a custom application-specified callback can trigger
4947      * connection failure or record a verification error.
4948      */
4949     if (ret <= 0)
4950         s->verify_result = X509_V_ERR_NO_VALID_SCTS;
4951     return ret;
4952 }
4953 
4954 int SSL_CTX_enable_ct(SSL_CTX *ctx, int validation_mode)
4955 {
4956     switch (validation_mode) {
4957     default:
4958         SSLerr(SSL_F_SSL_CTX_ENABLE_CT, SSL_R_INVALID_CT_VALIDATION_TYPE);
4959         return 0;
4960     case SSL_CT_VALIDATION_PERMISSIVE:
4961         return SSL_CTX_set_ct_validation_callback(ctx, ct_permissive, NULL);
4962     case SSL_CT_VALIDATION_STRICT:
4963         return SSL_CTX_set_ct_validation_callback(ctx, ct_strict, NULL);
4964     }
4965 }
4966 
4967 int SSL_enable_ct(SSL *s, int validation_mode)
4968 {
4969     switch (validation_mode) {
4970     default:
4971         SSLerr(SSL_F_SSL_ENABLE_CT, SSL_R_INVALID_CT_VALIDATION_TYPE);
4972         return 0;
4973     case SSL_CT_VALIDATION_PERMISSIVE:
4974         return SSL_set_ct_validation_callback(s, ct_permissive, NULL);
4975     case SSL_CT_VALIDATION_STRICT:
4976         return SSL_set_ct_validation_callback(s, ct_strict, NULL);
4977     }
4978 }
4979 
4980 int SSL_CTX_set_default_ctlog_list_file(SSL_CTX *ctx)
4981 {
4982     return CTLOG_STORE_load_default_file(ctx->ctlog_store);
4983 }
4984 
4985 int SSL_CTX_set_ctlog_list_file(SSL_CTX *ctx, const char *path)
4986 {
4987     return CTLOG_STORE_load_file(ctx->ctlog_store, path);
4988 }
4989 
4990 void SSL_CTX_set0_ctlog_store(SSL_CTX *ctx, CTLOG_STORE * logs)
4991 {
4992     CTLOG_STORE_free(ctx->ctlog_store);
4993     ctx->ctlog_store = logs;
4994 }
4995 
4996 const CTLOG_STORE *SSL_CTX_get0_ctlog_store(const SSL_CTX *ctx)
4997 {
4998     return ctx->ctlog_store;
4999 }
5000 
5001 #endif  /* OPENSSL_NO_CT */
5002 
5003 void SSL_CTX_set_client_hello_cb(SSL_CTX *c, SSL_client_hello_cb_fn cb,
5004                                  void *arg)
5005 {
5006     c->client_hello_cb = cb;
5007     c->client_hello_cb_arg = arg;
5008 }
5009 
5010 int SSL_client_hello_isv2(SSL *s)
5011 {
5012     if (s->clienthello == NULL)
5013         return 0;
5014     return s->clienthello->isv2;
5015 }
5016 
5017 unsigned int SSL_client_hello_get0_legacy_version(SSL *s)
5018 {
5019     if (s->clienthello == NULL)
5020         return 0;
5021     return s->clienthello->legacy_version;
5022 }
5023 
5024 size_t SSL_client_hello_get0_random(SSL *s, const unsigned char **out)
5025 {
5026     if (s->clienthello == NULL)
5027         return 0;
5028     if (out != NULL)
5029         *out = s->clienthello->random;
5030     return SSL3_RANDOM_SIZE;
5031 }
5032 
5033 size_t SSL_client_hello_get0_session_id(SSL *s, const unsigned char **out)
5034 {
5035     if (s->clienthello == NULL)
5036         return 0;
5037     if (out != NULL)
5038         *out = s->clienthello->session_id;
5039     return s->clienthello->session_id_len;
5040 }
5041 
5042 size_t SSL_client_hello_get0_ciphers(SSL *s, const unsigned char **out)
5043 {
5044     if (s->clienthello == NULL)
5045         return 0;
5046     if (out != NULL)
5047         *out = PACKET_data(&s->clienthello->ciphersuites);
5048     return PACKET_remaining(&s->clienthello->ciphersuites);
5049 }
5050 
5051 size_t SSL_client_hello_get0_compression_methods(SSL *s, const unsigned char **out)
5052 {
5053     if (s->clienthello == NULL)
5054         return 0;
5055     if (out != NULL)
5056         *out = s->clienthello->compressions;
5057     return s->clienthello->compressions_len;
5058 }
5059 
5060 int SSL_client_hello_get1_extensions_present(SSL *s, int **out, size_t *outlen)
5061 {
5062     RAW_EXTENSION *ext;
5063     int *present;
5064     size_t num = 0, i;
5065 
5066     if (s->clienthello == NULL || out == NULL || outlen == NULL)
5067         return 0;
5068     for (i = 0; i < s->clienthello->pre_proc_exts_len; i++) {
5069         ext = s->clienthello->pre_proc_exts + i;
5070         if (ext->present)
5071             num++;
5072     }
5073     if (num == 0) {
5074         *out = NULL;
5075         *outlen = 0;
5076         return 1;
5077     }
5078     if ((present = OPENSSL_malloc(sizeof(*present) * num)) == NULL) {
5079         SSLerr(SSL_F_SSL_CLIENT_HELLO_GET1_EXTENSIONS_PRESENT,
5080                ERR_R_MALLOC_FAILURE);
5081         return 0;
5082     }
5083     for (i = 0; i < s->clienthello->pre_proc_exts_len; i++) {
5084         ext = s->clienthello->pre_proc_exts + i;
5085         if (ext->present) {
5086             if (ext->received_order >= num)
5087                 goto err;
5088             present[ext->received_order] = ext->type;
5089         }
5090     }
5091     *out = present;
5092     *outlen = num;
5093     return 1;
5094  err:
5095     OPENSSL_free(present);
5096     return 0;
5097 }
5098 
5099 int SSL_client_hello_get0_ext(SSL *s, unsigned int type, const unsigned char **out,
5100                        size_t *outlen)
5101 {
5102     size_t i;
5103     RAW_EXTENSION *r;
5104 
5105     if (s->clienthello == NULL)
5106         return 0;
5107     for (i = 0; i < s->clienthello->pre_proc_exts_len; ++i) {
5108         r = s->clienthello->pre_proc_exts + i;
5109         if (r->present && r->type == type) {
5110             if (out != NULL)
5111                 *out = PACKET_data(&r->data);
5112             if (outlen != NULL)
5113                 *outlen = PACKET_remaining(&r->data);
5114             return 1;
5115         }
5116     }
5117     return 0;
5118 }
5119 
5120 int SSL_free_buffers(SSL *ssl)
5121 {
5122     RECORD_LAYER *rl = &ssl->rlayer;
5123 
5124     if (RECORD_LAYER_read_pending(rl) || RECORD_LAYER_write_pending(rl))
5125         return 0;
5126 
5127     RECORD_LAYER_release(rl);
5128     return 1;
5129 }
5130 
5131 int SSL_alloc_buffers(SSL *ssl)
5132 {
5133     return ssl3_setup_buffers(ssl);
5134 }
5135 
5136 void SSL_CTX_set_keylog_callback(SSL_CTX *ctx, SSL_CTX_keylog_cb_func cb)
5137 {
5138     ctx->keylog_callback = cb;
5139 }
5140 
5141 SSL_CTX_keylog_cb_func SSL_CTX_get_keylog_callback(const SSL_CTX *ctx)
5142 {
5143     return ctx->keylog_callback;
5144 }
5145 
5146 static int nss_keylog_int(const char *prefix,
5147                           SSL *ssl,
5148                           const uint8_t *parameter_1,
5149                           size_t parameter_1_len,
5150                           const uint8_t *parameter_2,
5151                           size_t parameter_2_len)
5152 {
5153     char *out = NULL;
5154     char *cursor = NULL;
5155     size_t out_len = 0;
5156     size_t i;
5157     size_t prefix_len;
5158 
5159     if (ssl->ctx->keylog_callback == NULL)
5160         return 1;
5161 
5162     /*
5163      * Our output buffer will contain the following strings, rendered with
5164      * space characters in between, terminated by a NULL character: first the
5165      * prefix, then the first parameter, then the second parameter. The
5166      * meaning of each parameter depends on the specific key material being
5167      * logged. Note that the first and second parameters are encoded in
5168      * hexadecimal, so we need a buffer that is twice their lengths.
5169      */
5170     prefix_len = strlen(prefix);
5171     out_len = prefix_len + (2 * parameter_1_len) + (2 * parameter_2_len) + 3;
5172     if ((out = cursor = OPENSSL_malloc(out_len)) == NULL) {
5173         SSLfatal(ssl, SSL_AD_INTERNAL_ERROR, SSL_F_NSS_KEYLOG_INT,
5174                  ERR_R_MALLOC_FAILURE);
5175         return 0;
5176     }
5177 
5178     strcpy(cursor, prefix);
5179     cursor += prefix_len;
5180     *cursor++ = ' ';
5181 
5182     for (i = 0; i < parameter_1_len; i++) {
5183         sprintf(cursor, "%02x", parameter_1[i]);
5184         cursor += 2;
5185     }
5186     *cursor++ = ' ';
5187 
5188     for (i = 0; i < parameter_2_len; i++) {
5189         sprintf(cursor, "%02x", parameter_2[i]);
5190         cursor += 2;
5191     }
5192     *cursor = '\0';
5193 
5194     ssl->ctx->keylog_callback(ssl, (const char *)out);
5195     OPENSSL_clear_free(out, out_len);
5196     return 1;
5197 
5198 }
5199 
5200 int ssl_log_rsa_client_key_exchange(SSL *ssl,
5201                                     const uint8_t *encrypted_premaster,
5202                                     size_t encrypted_premaster_len,
5203                                     const uint8_t *premaster,
5204                                     size_t premaster_len)
5205 {
5206     if (encrypted_premaster_len < 8) {
5207         SSLfatal(ssl, SSL_AD_INTERNAL_ERROR,
5208                  SSL_F_SSL_LOG_RSA_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
5209         return 0;
5210     }
5211 
5212     /* We only want the first 8 bytes of the encrypted premaster as a tag. */
5213     return nss_keylog_int("RSA",
5214                           ssl,
5215                           encrypted_premaster,
5216                           8,
5217                           premaster,
5218                           premaster_len);
5219 }
5220 
5221 int ssl_log_secret(SSL *ssl,
5222                    const char *label,
5223                    const uint8_t *secret,
5224                    size_t secret_len)
5225 {
5226     return nss_keylog_int(label,
5227                           ssl,
5228                           ssl->s3->client_random,
5229                           SSL3_RANDOM_SIZE,
5230                           secret,
5231                           secret_len);
5232 }
5233 
5234 #define SSLV2_CIPHER_LEN    3
5235 
5236 int ssl_cache_cipherlist(SSL *s, PACKET *cipher_suites, int sslv2format)
5237 {
5238     int n;
5239 
5240     n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
5241 
5242     if (PACKET_remaining(cipher_suites) == 0) {
5243         SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SSL_CACHE_CIPHERLIST,
5244                  SSL_R_NO_CIPHERS_SPECIFIED);
5245         return 0;
5246     }
5247 
5248     if (PACKET_remaining(cipher_suites) % n != 0) {
5249         SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL_CACHE_CIPHERLIST,
5250                  SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
5251         return 0;
5252     }
5253 
5254     OPENSSL_free(s->s3->tmp.ciphers_raw);
5255     s->s3->tmp.ciphers_raw = NULL;
5256     s->s3->tmp.ciphers_rawlen = 0;
5257 
5258     if (sslv2format) {
5259         size_t numciphers = PACKET_remaining(cipher_suites) / n;
5260         PACKET sslv2ciphers = *cipher_suites;
5261         unsigned int leadbyte;
5262         unsigned char *raw;
5263 
5264         /*
5265          * We store the raw ciphers list in SSLv3+ format so we need to do some
5266          * preprocessing to convert the list first. If there are any SSLv2 only
5267          * ciphersuites with a non-zero leading byte then we are going to
5268          * slightly over allocate because we won't store those. But that isn't a
5269          * problem.
5270          */
5271         raw = OPENSSL_malloc(numciphers * TLS_CIPHER_LEN);
5272         s->s3->tmp.ciphers_raw = raw;
5273         if (raw == NULL) {
5274             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CACHE_CIPHERLIST,
5275                      ERR_R_MALLOC_FAILURE);
5276             return 0;
5277         }
5278         for (s->s3->tmp.ciphers_rawlen = 0;
5279              PACKET_remaining(&sslv2ciphers) > 0;
5280              raw += TLS_CIPHER_LEN) {
5281             if (!PACKET_get_1(&sslv2ciphers, &leadbyte)
5282                     || (leadbyte == 0
5283                         && !PACKET_copy_bytes(&sslv2ciphers, raw,
5284                                               TLS_CIPHER_LEN))
5285                     || (leadbyte != 0
5286                         && !PACKET_forward(&sslv2ciphers, TLS_CIPHER_LEN))) {
5287                 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL_CACHE_CIPHERLIST,
5288                          SSL_R_BAD_PACKET);
5289                 OPENSSL_free(s->s3->tmp.ciphers_raw);
5290                 s->s3->tmp.ciphers_raw = NULL;
5291                 s->s3->tmp.ciphers_rawlen = 0;
5292                 return 0;
5293             }
5294             if (leadbyte == 0)
5295                 s->s3->tmp.ciphers_rawlen += TLS_CIPHER_LEN;
5296         }
5297     } else if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
5298                            &s->s3->tmp.ciphers_rawlen)) {
5299         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CACHE_CIPHERLIST,
5300                  ERR_R_INTERNAL_ERROR);
5301         return 0;
5302     }
5303     return 1;
5304 }
5305 
5306 int SSL_bytes_to_cipher_list(SSL *s, const unsigned char *bytes, size_t len,
5307                              int isv2format, STACK_OF(SSL_CIPHER) **sk,
5308                              STACK_OF(SSL_CIPHER) **scsvs)
5309 {
5310     PACKET pkt;
5311 
5312     if (!PACKET_buf_init(&pkt, bytes, len))
5313         return 0;
5314     return bytes_to_cipher_list(s, &pkt, sk, scsvs, isv2format, 0);
5315 }
5316 
5317 int bytes_to_cipher_list(SSL *s, PACKET *cipher_suites,
5318                          STACK_OF(SSL_CIPHER) **skp,
5319                          STACK_OF(SSL_CIPHER) **scsvs_out,
5320                          int sslv2format, int fatal)
5321 {
5322     const SSL_CIPHER *c;
5323     STACK_OF(SSL_CIPHER) *sk = NULL;
5324     STACK_OF(SSL_CIPHER) *scsvs = NULL;
5325     int n;
5326     /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
5327     unsigned char cipher[SSLV2_CIPHER_LEN];
5328 
5329     n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
5330 
5331     if (PACKET_remaining(cipher_suites) == 0) {
5332         if (fatal)
5333             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_BYTES_TO_CIPHER_LIST,
5334                      SSL_R_NO_CIPHERS_SPECIFIED);
5335         else
5336             SSLerr(SSL_F_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
5337         return 0;
5338     }
5339 
5340     if (PACKET_remaining(cipher_suites) % n != 0) {
5341         if (fatal)
5342             SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_BYTES_TO_CIPHER_LIST,
5343                      SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
5344         else
5345             SSLerr(SSL_F_BYTES_TO_CIPHER_LIST,
5346                    SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
5347         return 0;
5348     }
5349 
5350     sk = sk_SSL_CIPHER_new_null();
5351     scsvs = sk_SSL_CIPHER_new_null();
5352     if (sk == NULL || scsvs == NULL) {
5353         if (fatal)
5354             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_BYTES_TO_CIPHER_LIST,
5355                      ERR_R_MALLOC_FAILURE);
5356         else
5357             SSLerr(SSL_F_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
5358         goto err;
5359     }
5360 
5361     while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
5362         /*
5363          * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
5364          * first byte set to zero, while true SSLv2 ciphers have a non-zero
5365          * first byte. We don't support any true SSLv2 ciphers, so skip them.
5366          */
5367         if (sslv2format && cipher[0] != '\0')
5368             continue;
5369 
5370         /* For SSLv2-compat, ignore leading 0-byte. */
5371         c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher, 1);
5372         if (c != NULL) {
5373             if ((c->valid && !sk_SSL_CIPHER_push(sk, c)) ||
5374                 (!c->valid && !sk_SSL_CIPHER_push(scsvs, c))) {
5375                 if (fatal)
5376                     SSLfatal(s, SSL_AD_INTERNAL_ERROR,
5377                              SSL_F_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
5378                 else
5379                     SSLerr(SSL_F_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
5380                 goto err;
5381             }
5382         }
5383     }
5384     if (PACKET_remaining(cipher_suites) > 0) {
5385         if (fatal)
5386             SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_BYTES_TO_CIPHER_LIST,
5387                      SSL_R_BAD_LENGTH);
5388         else
5389             SSLerr(SSL_F_BYTES_TO_CIPHER_LIST, SSL_R_BAD_LENGTH);
5390         goto err;
5391     }
5392 
5393     if (skp != NULL)
5394         *skp = sk;
5395     else
5396         sk_SSL_CIPHER_free(sk);
5397     if (scsvs_out != NULL)
5398         *scsvs_out = scsvs;
5399     else
5400         sk_SSL_CIPHER_free(scsvs);
5401     return 1;
5402  err:
5403     sk_SSL_CIPHER_free(sk);
5404     sk_SSL_CIPHER_free(scsvs);
5405     return 0;
5406 }
5407 
5408 int SSL_CTX_set_max_early_data(SSL_CTX *ctx, uint32_t max_early_data)
5409 {
5410     ctx->max_early_data = max_early_data;
5411 
5412     return 1;
5413 }
5414 
5415 uint32_t SSL_CTX_get_max_early_data(const SSL_CTX *ctx)
5416 {
5417     return ctx->max_early_data;
5418 }
5419 
5420 int SSL_set_max_early_data(SSL *s, uint32_t max_early_data)
5421 {
5422     s->max_early_data = max_early_data;
5423 
5424     return 1;
5425 }
5426 
5427 uint32_t SSL_get_max_early_data(const SSL *s)
5428 {
5429     return s->max_early_data;
5430 }
5431 
5432 int SSL_CTX_set_recv_max_early_data(SSL_CTX *ctx, uint32_t recv_max_early_data)
5433 {
5434     ctx->recv_max_early_data = recv_max_early_data;
5435 
5436     return 1;
5437 }
5438 
5439 uint32_t SSL_CTX_get_recv_max_early_data(const SSL_CTX *ctx)
5440 {
5441     return ctx->recv_max_early_data;
5442 }
5443 
5444 int SSL_set_recv_max_early_data(SSL *s, uint32_t recv_max_early_data)
5445 {
5446     s->recv_max_early_data = recv_max_early_data;
5447 
5448     return 1;
5449 }
5450 
5451 uint32_t SSL_get_recv_max_early_data(const SSL *s)
5452 {
5453     return s->recv_max_early_data;
5454 }
5455 
5456 __owur unsigned int ssl_get_max_send_fragment(const SSL *ssl)
5457 {
5458     /* Return any active Max Fragment Len extension */
5459     if (ssl->session != NULL && USE_MAX_FRAGMENT_LENGTH_EXT(ssl->session))
5460         return GET_MAX_FRAGMENT_LENGTH(ssl->session);
5461 
5462     /* return current SSL connection setting */
5463     return ssl->max_send_fragment;
5464 }
5465 
5466 __owur unsigned int ssl_get_split_send_fragment(const SSL *ssl)
5467 {
5468     /* Return a value regarding an active Max Fragment Len extension */
5469     if (ssl->session != NULL && USE_MAX_FRAGMENT_LENGTH_EXT(ssl->session)
5470         && ssl->split_send_fragment > GET_MAX_FRAGMENT_LENGTH(ssl->session))
5471         return GET_MAX_FRAGMENT_LENGTH(ssl->session);
5472 
5473     /* else limit |split_send_fragment| to current |max_send_fragment| */
5474     if (ssl->split_send_fragment > ssl->max_send_fragment)
5475         return ssl->max_send_fragment;
5476 
5477     /* return current SSL connection setting */
5478     return ssl->split_send_fragment;
5479 }
5480 
5481 int SSL_stateless(SSL *s)
5482 {
5483     int ret;
5484 
5485     /* Ensure there is no state left over from a previous invocation */
5486     if (!SSL_clear(s))
5487         return 0;
5488 
5489     ERR_clear_error();
5490 
5491     s->s3->flags |= TLS1_FLAGS_STATELESS;
5492     ret = SSL_accept(s);
5493     s->s3->flags &= ~TLS1_FLAGS_STATELESS;
5494 
5495     if (ret > 0 && s->ext.cookieok)
5496         return 1;
5497 
5498     if (s->hello_retry_request == SSL_HRR_PENDING && !ossl_statem_in_error(s))
5499         return 0;
5500 
5501     return -1;
5502 }
5503 
5504 void SSL_CTX_set_post_handshake_auth(SSL_CTX *ctx, int val)
5505 {
5506     ctx->pha_enabled = val;
5507 }
5508 
5509 void SSL_set_post_handshake_auth(SSL *ssl, int val)
5510 {
5511     ssl->pha_enabled = val;
5512 }
5513 
5514 int SSL_verify_client_post_handshake(SSL *ssl)
5515 {
5516     if (!SSL_IS_TLS13(ssl)) {
5517         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_WRONG_SSL_VERSION);
5518         return 0;
5519     }
5520     if (!ssl->server) {
5521         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_NOT_SERVER);
5522         return 0;
5523     }
5524 
5525     if (!SSL_is_init_finished(ssl)) {
5526         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_STILL_IN_INIT);
5527         return 0;
5528     }
5529 
5530     switch (ssl->post_handshake_auth) {
5531     case SSL_PHA_NONE:
5532         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_EXTENSION_NOT_RECEIVED);
5533         return 0;
5534     default:
5535     case SSL_PHA_EXT_SENT:
5536         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, ERR_R_INTERNAL_ERROR);
5537         return 0;
5538     case SSL_PHA_EXT_RECEIVED:
5539         break;
5540     case SSL_PHA_REQUEST_PENDING:
5541         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_REQUEST_PENDING);
5542         return 0;
5543     case SSL_PHA_REQUESTED:
5544         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_REQUEST_SENT);
5545         return 0;
5546     }
5547 
5548     ssl->post_handshake_auth = SSL_PHA_REQUEST_PENDING;
5549 
5550     /* checks verify_mode and algorithm_auth */
5551     if (!send_certificate_request(ssl)) {
5552         ssl->post_handshake_auth = SSL_PHA_EXT_RECEIVED; /* restore on error */
5553         SSLerr(SSL_F_SSL_VERIFY_CLIENT_POST_HANDSHAKE, SSL_R_INVALID_CONFIG);
5554         return 0;
5555     }
5556 
5557     ossl_statem_set_in_init(ssl, 1);
5558     return 1;
5559 }
5560 
5561 int SSL_CTX_set_session_ticket_cb(SSL_CTX *ctx,
5562                                   SSL_CTX_generate_session_ticket_fn gen_cb,
5563                                   SSL_CTX_decrypt_session_ticket_fn dec_cb,
5564                                   void *arg)
5565 {
5566     ctx->generate_ticket_cb = gen_cb;
5567     ctx->decrypt_ticket_cb = dec_cb;
5568     ctx->ticket_cb_data = arg;
5569     return 1;
5570 }
5571 
5572 void SSL_CTX_set_allow_early_data_cb(SSL_CTX *ctx,
5573                                      SSL_allow_early_data_cb_fn cb,
5574                                      void *arg)
5575 {
5576     ctx->allow_early_data_cb = cb;
5577     ctx->allow_early_data_cb_data = arg;
5578 }
5579 
5580 void SSL_set_allow_early_data_cb(SSL *s,
5581                                  SSL_allow_early_data_cb_fn cb,
5582                                  void *arg)
5583 {
5584     s->allow_early_data_cb = cb;
5585     s->allow_early_data_cb_data = arg;
5586 }
5587