xref: /freebsd/crypto/openssl/ssl/ssl_lib.c (revision d9f0ce31900a48d1a2bfc1c8c86f79d1e831451a)
1 /*
2  * ! \file ssl/ssl_lib.c \brief Version independent SSL functions.
3  */
4 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5  * All rights reserved.
6  *
7  * This package is an SSL implementation written
8  * by Eric Young (eay@cryptsoft.com).
9  * The implementation was written so as to conform with Netscapes SSL.
10  *
11  * This library is free for commercial and non-commercial use as long as
12  * the following conditions are aheared to.  The following conditions
13  * apply to all code found in this distribution, be it the RC4, RSA,
14  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
15  * included with this distribution is covered by the same copyright terms
16  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
17  *
18  * Copyright remains Eric Young's, and as such any Copyright notices in
19  * the code are not to be removed.
20  * If this package is used in a product, Eric Young should be given attribution
21  * as the author of the parts of the library used.
22  * This can be in the form of a textual message at program startup or
23  * in documentation (online or textual) provided with the package.
24  *
25  * Redistribution and use in source and binary forms, with or without
26  * modification, are permitted provided that the following conditions
27  * are met:
28  * 1. Redistributions of source code must retain the copyright
29  *    notice, this list of conditions and the following disclaimer.
30  * 2. Redistributions in binary form must reproduce the above copyright
31  *    notice, this list of conditions and the following disclaimer in the
32  *    documentation and/or other materials provided with the distribution.
33  * 3. All advertising materials mentioning features or use of this software
34  *    must display the following acknowledgement:
35  *    "This product includes cryptographic software written by
36  *     Eric Young (eay@cryptsoft.com)"
37  *    The word 'cryptographic' can be left out if the rouines from the library
38  *    being used are not cryptographic related :-).
39  * 4. If you include any Windows specific code (or a derivative thereof) from
40  *    the apps directory (application code) you must include an acknowledgement:
41  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
42  *
43  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53  * SUCH DAMAGE.
54  *
55  * The licence and distribution terms for any publically available version or
56  * derivative of this code cannot be changed.  i.e. this code cannot simply be
57  * copied and put under another distribution licence
58  * [including the GNU Public Licence.]
59  */
60 /* ====================================================================
61  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
62  *
63  * Redistribution and use in source and binary forms, with or without
64  * modification, are permitted provided that the following conditions
65  * are met:
66  *
67  * 1. Redistributions of source code must retain the above copyright
68  *    notice, this list of conditions and the following disclaimer.
69  *
70  * 2. Redistributions in binary form must reproduce the above copyright
71  *    notice, this list of conditions and the following disclaimer in
72  *    the documentation and/or other materials provided with the
73  *    distribution.
74  *
75  * 3. All advertising materials mentioning features or use of this
76  *    software must display the following acknowledgment:
77  *    "This product includes software developed by the OpenSSL Project
78  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
79  *
80  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
81  *    endorse or promote products derived from this software without
82  *    prior written permission. For written permission, please contact
83  *    openssl-core@openssl.org.
84  *
85  * 5. Products derived from this software may not be called "OpenSSL"
86  *    nor may "OpenSSL" appear in their names without prior written
87  *    permission of the OpenSSL Project.
88  *
89  * 6. Redistributions of any form whatsoever must retain the following
90  *    acknowledgment:
91  *    "This product includes software developed by the OpenSSL Project
92  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
93  *
94  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
95  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
96  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
97  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
98  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
99  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
100  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
101  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
102  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
103  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
104  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
105  * OF THE POSSIBILITY OF SUCH DAMAGE.
106  * ====================================================================
107  *
108  * This product includes cryptographic software written by Eric Young
109  * (eay@cryptsoft.com).  This product includes software written by Tim
110  * Hudson (tjh@cryptsoft.com).
111  *
112  */
113 /* ====================================================================
114  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
115  * ECC cipher suite support in OpenSSL originally developed by
116  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
117  */
118 /* ====================================================================
119  * Copyright 2005 Nokia. All rights reserved.
120  *
121  * The portions of the attached software ("Contribution") is developed by
122  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
123  * license.
124  *
125  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
126  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
127  * support (see RFC 4279) to OpenSSL.
128  *
129  * No patent licenses or other rights except those expressly stated in
130  * the OpenSSL open source license shall be deemed granted or received
131  * expressly, by implication, estoppel, or otherwise.
132  *
133  * No assurances are provided by Nokia that the Contribution does not
134  * infringe the patent or other intellectual property rights of any third
135  * party or that the license provides you with all the necessary rights
136  * to make use of the Contribution.
137  *
138  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
139  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
140  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
141  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
142  * OTHERWISE.
143  */
144 
145 #ifdef REF_CHECK
146 # include <assert.h>
147 #endif
148 #include <stdio.h>
149 #include "ssl_locl.h"
150 #include "kssl_lcl.h"
151 #include <openssl/objects.h>
152 #include <openssl/lhash.h>
153 #include <openssl/x509v3.h>
154 #include <openssl/rand.h>
155 #include <openssl/ocsp.h>
156 #ifndef OPENSSL_NO_DH
157 # include <openssl/dh.h>
158 #endif
159 #ifndef OPENSSL_NO_ENGINE
160 # include <openssl/engine.h>
161 #endif
162 
163 const char *SSL_version_str = OPENSSL_VERSION_TEXT;
164 
165 SSL3_ENC_METHOD ssl3_undef_enc_method = {
166     /*
167      * evil casts, but these functions are only called if there's a library
168      * bug
169      */
170     (int (*)(SSL *, int))ssl_undefined_function,
171     (int (*)(SSL *, unsigned char *, int))ssl_undefined_function,
172     ssl_undefined_function,
173     (int (*)(SSL *, unsigned char *, unsigned char *, int))
174         ssl_undefined_function,
175     (int (*)(SSL *, int))ssl_undefined_function,
176     (int (*)(SSL *, const char *, int, unsigned char *))
177         ssl_undefined_function,
178     0,                          /* finish_mac_length */
179     (int (*)(SSL *, int, unsigned char *))ssl_undefined_function,
180     NULL,                       /* client_finished_label */
181     0,                          /* client_finished_label_len */
182     NULL,                       /* server_finished_label */
183     0,                          /* server_finished_label_len */
184     (int (*)(int))ssl_undefined_function,
185     (int (*)(SSL *, unsigned char *, size_t, const char *,
186              size_t, const unsigned char *, size_t,
187              int use_context))ssl_undefined_function,
188 };
189 
190 int SSL_clear(SSL *s)
191 {
192 
193     if (s->method == NULL) {
194         SSLerr(SSL_F_SSL_CLEAR, SSL_R_NO_METHOD_SPECIFIED);
195         return (0);
196     }
197 
198     if (ssl_clear_bad_session(s)) {
199         SSL_SESSION_free(s->session);
200         s->session = NULL;
201     }
202 
203     s->error = 0;
204     s->hit = 0;
205     s->shutdown = 0;
206 
207 #if 0
208     /*
209      * Disabled since version 1.10 of this file (early return not
210      * needed because SSL_clear is not called when doing renegotiation)
211      */
212     /*
213      * This is set if we are doing dynamic renegotiation so keep
214      * the old cipher.  It is sort of a SSL_clear_lite :-)
215      */
216     if (s->renegotiate)
217         return (1);
218 #else
219     if (s->renegotiate) {
220         SSLerr(SSL_F_SSL_CLEAR, ERR_R_INTERNAL_ERROR);
221         return 0;
222     }
223 #endif
224 
225     s->type = 0;
226 
227     s->state = SSL_ST_BEFORE | ((s->server) ? SSL_ST_ACCEPT : SSL_ST_CONNECT);
228 
229     s->version = s->method->version;
230     s->client_version = s->version;
231     s->rwstate = SSL_NOTHING;
232     s->rstate = SSL_ST_READ_HEADER;
233 #if 0
234     s->read_ahead = s->ctx->read_ahead;
235 #endif
236 
237     if (s->init_buf != NULL) {
238         BUF_MEM_free(s->init_buf);
239         s->init_buf = NULL;
240     }
241 
242     ssl_clear_cipher_ctx(s);
243     ssl_clear_hash_ctx(&s->read_hash);
244     ssl_clear_hash_ctx(&s->write_hash);
245 
246     s->first_packet = 0;
247 
248 #if 1
249     /*
250      * Check to see if we were changed into a different method, if so, revert
251      * back if we are not doing session-id reuse.
252      */
253     if (!s->in_handshake && (s->session == NULL)
254         && (s->method != s->ctx->method)) {
255         s->method->ssl_free(s);
256         s->method = s->ctx->method;
257         if (!s->method->ssl_new(s))
258             return (0);
259     } else
260 #endif
261         s->method->ssl_clear(s);
262     return (1);
263 }
264 
265 /** Used to change an SSL_CTXs default SSL method type */
266 int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
267 {
268     STACK_OF(SSL_CIPHER) *sk;
269 
270     ctx->method = meth;
271 
272     sk = ssl_create_cipher_list(ctx->method, &(ctx->cipher_list),
273                                 &(ctx->cipher_list_by_id),
274                                 meth->version ==
275                                 SSL2_VERSION ? "SSLv2" :
276                                 SSL_DEFAULT_CIPHER_LIST, ctx->cert);
277     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0)) {
278         SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,
279                SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
280         return (0);
281     }
282     return (1);
283 }
284 
285 SSL *SSL_new(SSL_CTX *ctx)
286 {
287     SSL *s;
288 
289     if (ctx == NULL) {
290         SSLerr(SSL_F_SSL_NEW, SSL_R_NULL_SSL_CTX);
291         return (NULL);
292     }
293     if (ctx->method == NULL) {
294         SSLerr(SSL_F_SSL_NEW, SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
295         return (NULL);
296     }
297 
298     s = (SSL *)OPENSSL_malloc(sizeof(SSL));
299     if (s == NULL)
300         goto err;
301     memset(s, 0, sizeof(SSL));
302 
303 #ifndef OPENSSL_NO_KRB5
304     s->kssl_ctx = kssl_ctx_new();
305 #endif                          /* OPENSSL_NO_KRB5 */
306 
307     s->options = ctx->options;
308     s->mode = ctx->mode;
309     s->max_cert_list = ctx->max_cert_list;
310     s->references = 1;
311 
312     if (ctx->cert != NULL) {
313         /*
314          * Earlier library versions used to copy the pointer to the CERT, not
315          * its contents; only when setting new parameters for the per-SSL
316          * copy, ssl_cert_new would be called (and the direct reference to
317          * the per-SSL_CTX settings would be lost, but those still were
318          * indirectly accessed for various purposes, and for that reason they
319          * used to be known as s->ctx->default_cert). Now we don't look at the
320          * SSL_CTX's CERT after having duplicated it once.
321          */
322 
323         s->cert = ssl_cert_dup(ctx->cert);
324         if (s->cert == NULL)
325             goto err;
326     } else
327         s->cert = NULL;         /* Cannot really happen (see SSL_CTX_new) */
328 
329     s->read_ahead = ctx->read_ahead;
330     s->msg_callback = ctx->msg_callback;
331     s->msg_callback_arg = ctx->msg_callback_arg;
332     s->verify_mode = ctx->verify_mode;
333 #if 0
334     s->verify_depth = ctx->verify_depth;
335 #endif
336     s->sid_ctx_length = ctx->sid_ctx_length;
337     OPENSSL_assert(s->sid_ctx_length <= sizeof s->sid_ctx);
338     memcpy(&s->sid_ctx, &ctx->sid_ctx, sizeof(s->sid_ctx));
339     s->verify_callback = ctx->default_verify_callback;
340     s->generate_session_id = ctx->generate_session_id;
341 
342     s->param = X509_VERIFY_PARAM_new();
343     if (!s->param)
344         goto err;
345     X509_VERIFY_PARAM_inherit(s->param, ctx->param);
346 #if 0
347     s->purpose = ctx->purpose;
348     s->trust = ctx->trust;
349 #endif
350     s->quiet_shutdown = ctx->quiet_shutdown;
351     s->max_send_fragment = ctx->max_send_fragment;
352 
353     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
354     s->ctx = ctx;
355 #ifndef OPENSSL_NO_TLSEXT
356     s->tlsext_debug_cb = 0;
357     s->tlsext_debug_arg = NULL;
358     s->tlsext_ticket_expected = 0;
359     s->tlsext_status_type = -1;
360     s->tlsext_status_expected = 0;
361     s->tlsext_ocsp_ids = NULL;
362     s->tlsext_ocsp_exts = NULL;
363     s->tlsext_ocsp_resp = NULL;
364     s->tlsext_ocsp_resplen = -1;
365     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
366     s->initial_ctx = ctx;
367 # ifndef OPENSSL_NO_EC
368     if (ctx->tlsext_ecpointformatlist) {
369         s->tlsext_ecpointformatlist =
370             BUF_memdup(ctx->tlsext_ecpointformatlist,
371                        ctx->tlsext_ecpointformatlist_length);
372         if (!s->tlsext_ecpointformatlist)
373             goto err;
374         s->tlsext_ecpointformatlist_length =
375             ctx->tlsext_ecpointformatlist_length;
376     }
377     if (ctx->tlsext_ellipticcurvelist) {
378         s->tlsext_ellipticcurvelist =
379             BUF_memdup(ctx->tlsext_ellipticcurvelist,
380                        ctx->tlsext_ellipticcurvelist_length);
381         if (!s->tlsext_ellipticcurvelist)
382             goto err;
383         s->tlsext_ellipticcurvelist_length =
384             ctx->tlsext_ellipticcurvelist_length;
385     }
386 # endif
387 # ifndef OPENSSL_NO_NEXTPROTONEG
388     s->next_proto_negotiated = NULL;
389 # endif
390 
391     if (s->ctx->alpn_client_proto_list) {
392         s->alpn_client_proto_list =
393             OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
394         if (s->alpn_client_proto_list == NULL)
395             goto err;
396         memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
397                s->ctx->alpn_client_proto_list_len);
398         s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
399     }
400 #endif
401 
402     s->verify_result = X509_V_OK;
403 
404     s->method = ctx->method;
405 
406     if (!s->method->ssl_new(s))
407         goto err;
408 
409     s->server = (ctx->method->ssl_accept == ssl_undefined_function) ? 0 : 1;
410 
411     SSL_clear(s);
412 
413     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
414 
415 #ifndef OPENSSL_NO_PSK
416     s->psk_client_callback = ctx->psk_client_callback;
417     s->psk_server_callback = ctx->psk_server_callback;
418 #endif
419 
420     return (s);
421  err:
422     if (s != NULL)
423         SSL_free(s);
424     SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
425     return (NULL);
426 }
427 
428 int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
429                                    unsigned int sid_ctx_len)
430 {
431     if (sid_ctx_len > sizeof ctx->sid_ctx) {
432         SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,
433                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
434         return 0;
435     }
436     ctx->sid_ctx_length = sid_ctx_len;
437     memcpy(ctx->sid_ctx, sid_ctx, sid_ctx_len);
438 
439     return 1;
440 }
441 
442 int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
443                                unsigned int sid_ctx_len)
444 {
445     if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
446         SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,
447                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
448         return 0;
449     }
450     ssl->sid_ctx_length = sid_ctx_len;
451     memcpy(ssl->sid_ctx, sid_ctx, sid_ctx_len);
452 
453     return 1;
454 }
455 
456 int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
457 {
458     CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
459     ctx->generate_session_id = cb;
460     CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
461     return 1;
462 }
463 
464 int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
465 {
466     CRYPTO_w_lock(CRYPTO_LOCK_SSL);
467     ssl->generate_session_id = cb;
468     CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
469     return 1;
470 }
471 
472 int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
473                                 unsigned int id_len)
474 {
475     /*
476      * A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
477      * we can "construct" a session to give us the desired check - ie. to
478      * find if there's a session in the hash table that would conflict with
479      * any new session built out of this id/id_len and the ssl_version in use
480      * by this SSL.
481      */
482     SSL_SESSION r, *p;
483 
484     if (id_len > sizeof r.session_id)
485         return 0;
486 
487     r.ssl_version = ssl->version;
488     r.session_id_length = id_len;
489     memcpy(r.session_id, id, id_len);
490     /*
491      * NB: SSLv2 always uses a fixed 16-byte session ID, so even if a
492      * callback is calling us to check the uniqueness of a shorter ID, it
493      * must be compared as a padded-out ID because that is what it will be
494      * converted to when the callback has finished choosing it.
495      */
496     if ((r.ssl_version == SSL2_VERSION) &&
497         (id_len < SSL2_SSL_SESSION_ID_LENGTH)) {
498         memset(r.session_id + id_len, 0, SSL2_SSL_SESSION_ID_LENGTH - id_len);
499         r.session_id_length = SSL2_SSL_SESSION_ID_LENGTH;
500     }
501 
502     CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
503     p = lh_SSL_SESSION_retrieve(ssl->ctx->sessions, &r);
504     CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
505     return (p != NULL);
506 }
507 
508 int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
509 {
510     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
511 }
512 
513 int SSL_set_purpose(SSL *s, int purpose)
514 {
515     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
516 }
517 
518 int SSL_CTX_set_trust(SSL_CTX *s, int trust)
519 {
520     return X509_VERIFY_PARAM_set_trust(s->param, trust);
521 }
522 
523 int SSL_set_trust(SSL *s, int trust)
524 {
525     return X509_VERIFY_PARAM_set_trust(s->param, trust);
526 }
527 
528 int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
529 {
530     return X509_VERIFY_PARAM_set1(ctx->param, vpm);
531 }
532 
533 int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
534 {
535     return X509_VERIFY_PARAM_set1(ssl->param, vpm);
536 }
537 
538 X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
539 {
540     return ctx->param;
541 }
542 
543 X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
544 {
545     return ssl->param;
546 }
547 
548 void SSL_certs_clear(SSL *s)
549 {
550     ssl_cert_clear_certs(s->cert);
551 }
552 
553 void SSL_free(SSL *s)
554 {
555     int i;
556 
557     if (s == NULL)
558         return;
559 
560     i = CRYPTO_add(&s->references, -1, CRYPTO_LOCK_SSL);
561 #ifdef REF_PRINT
562     REF_PRINT("SSL", s);
563 #endif
564     if (i > 0)
565         return;
566 #ifdef REF_CHECK
567     if (i < 0) {
568         fprintf(stderr, "SSL_free, bad reference count\n");
569         abort();                /* ok */
570     }
571 #endif
572 
573     if (s->param)
574         X509_VERIFY_PARAM_free(s->param);
575 
576     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
577 
578     if (s->bbio != NULL) {
579         /* If the buffering BIO is in place, pop it off */
580         if (s->bbio == s->wbio) {
581             s->wbio = BIO_pop(s->wbio);
582         }
583         BIO_free(s->bbio);
584         s->bbio = NULL;
585     }
586     if (s->rbio != NULL)
587         BIO_free_all(s->rbio);
588     if ((s->wbio != NULL) && (s->wbio != s->rbio))
589         BIO_free_all(s->wbio);
590 
591     if (s->init_buf != NULL)
592         BUF_MEM_free(s->init_buf);
593 
594     /* add extra stuff */
595     if (s->cipher_list != NULL)
596         sk_SSL_CIPHER_free(s->cipher_list);
597     if (s->cipher_list_by_id != NULL)
598         sk_SSL_CIPHER_free(s->cipher_list_by_id);
599 
600     /* Make the next call work :-) */
601     if (s->session != NULL) {
602         ssl_clear_bad_session(s);
603         SSL_SESSION_free(s->session);
604     }
605 
606     ssl_clear_cipher_ctx(s);
607     ssl_clear_hash_ctx(&s->read_hash);
608     ssl_clear_hash_ctx(&s->write_hash);
609 
610     if (s->cert != NULL)
611         ssl_cert_free(s->cert);
612     /* Free up if allocated */
613 
614 #ifndef OPENSSL_NO_TLSEXT
615     if (s->tlsext_hostname)
616         OPENSSL_free(s->tlsext_hostname);
617     if (s->initial_ctx)
618         SSL_CTX_free(s->initial_ctx);
619 # ifndef OPENSSL_NO_EC
620     if (s->tlsext_ecpointformatlist)
621         OPENSSL_free(s->tlsext_ecpointformatlist);
622     if (s->tlsext_ellipticcurvelist)
623         OPENSSL_free(s->tlsext_ellipticcurvelist);
624 # endif                         /* OPENSSL_NO_EC */
625     if (s->tlsext_opaque_prf_input)
626         OPENSSL_free(s->tlsext_opaque_prf_input);
627     if (s->tlsext_ocsp_exts)
628         sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, X509_EXTENSION_free);
629     if (s->tlsext_ocsp_ids)
630         sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
631     if (s->tlsext_ocsp_resp)
632         OPENSSL_free(s->tlsext_ocsp_resp);
633     if (s->alpn_client_proto_list)
634         OPENSSL_free(s->alpn_client_proto_list);
635 #endif
636 
637     if (s->client_CA != NULL)
638         sk_X509_NAME_pop_free(s->client_CA, X509_NAME_free);
639 
640     if (s->method != NULL)
641         s->method->ssl_free(s);
642 
643     if (s->ctx)
644         SSL_CTX_free(s->ctx);
645 
646 #ifndef OPENSSL_NO_KRB5
647     if (s->kssl_ctx != NULL)
648         kssl_ctx_free(s->kssl_ctx);
649 #endif                          /* OPENSSL_NO_KRB5 */
650 
651 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
652     if (s->next_proto_negotiated)
653         OPENSSL_free(s->next_proto_negotiated);
654 #endif
655 
656 #ifndef OPENSSL_NO_SRTP
657     if (s->srtp_profiles)
658         sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);
659 #endif
660 
661     OPENSSL_free(s);
662 }
663 
664 void SSL_set_bio(SSL *s, BIO *rbio, BIO *wbio)
665 {
666     /*
667      * If the output buffering BIO is still in place, remove it
668      */
669     if (s->bbio != NULL) {
670         if (s->wbio == s->bbio) {
671             s->wbio = s->wbio->next_bio;
672             s->bbio->next_bio = NULL;
673         }
674     }
675     if ((s->rbio != NULL) && (s->rbio != rbio))
676         BIO_free_all(s->rbio);
677     if ((s->wbio != NULL) && (s->wbio != wbio) && (s->rbio != s->wbio))
678         BIO_free_all(s->wbio);
679     s->rbio = rbio;
680     s->wbio = wbio;
681 }
682 
683 BIO *SSL_get_rbio(const SSL *s)
684 {
685     return (s->rbio);
686 }
687 
688 BIO *SSL_get_wbio(const SSL *s)
689 {
690     return (s->wbio);
691 }
692 
693 int SSL_get_fd(const SSL *s)
694 {
695     return (SSL_get_rfd(s));
696 }
697 
698 int SSL_get_rfd(const SSL *s)
699 {
700     int ret = -1;
701     BIO *b, *r;
702 
703     b = SSL_get_rbio(s);
704     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
705     if (r != NULL)
706         BIO_get_fd(r, &ret);
707     return (ret);
708 }
709 
710 int SSL_get_wfd(const SSL *s)
711 {
712     int ret = -1;
713     BIO *b, *r;
714 
715     b = SSL_get_wbio(s);
716     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
717     if (r != NULL)
718         BIO_get_fd(r, &ret);
719     return (ret);
720 }
721 
722 #ifndef OPENSSL_NO_SOCK
723 int SSL_set_fd(SSL *s, int fd)
724 {
725     int ret = 0;
726     BIO *bio = NULL;
727 
728     bio = BIO_new(BIO_s_socket());
729 
730     if (bio == NULL) {
731         SSLerr(SSL_F_SSL_SET_FD, ERR_R_BUF_LIB);
732         goto err;
733     }
734     BIO_set_fd(bio, fd, BIO_NOCLOSE);
735     SSL_set_bio(s, bio, bio);
736     ret = 1;
737  err:
738     return (ret);
739 }
740 
741 int SSL_set_wfd(SSL *s, int fd)
742 {
743     int ret = 0;
744     BIO *bio = NULL;
745 
746     if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
747         || ((int)BIO_get_fd(s->rbio, NULL) != fd)) {
748         bio = BIO_new(BIO_s_socket());
749 
750         if (bio == NULL) {
751             SSLerr(SSL_F_SSL_SET_WFD, ERR_R_BUF_LIB);
752             goto err;
753         }
754         BIO_set_fd(bio, fd, BIO_NOCLOSE);
755         SSL_set_bio(s, SSL_get_rbio(s), bio);
756     } else
757         SSL_set_bio(s, SSL_get_rbio(s), SSL_get_rbio(s));
758     ret = 1;
759  err:
760     return (ret);
761 }
762 
763 int SSL_set_rfd(SSL *s, int fd)
764 {
765     int ret = 0;
766     BIO *bio = NULL;
767 
768     if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
769         || ((int)BIO_get_fd(s->wbio, NULL) != fd)) {
770         bio = BIO_new(BIO_s_socket());
771 
772         if (bio == NULL) {
773             SSLerr(SSL_F_SSL_SET_RFD, ERR_R_BUF_LIB);
774             goto err;
775         }
776         BIO_set_fd(bio, fd, BIO_NOCLOSE);
777         SSL_set_bio(s, bio, SSL_get_wbio(s));
778     } else
779         SSL_set_bio(s, SSL_get_wbio(s), SSL_get_wbio(s));
780     ret = 1;
781  err:
782     return (ret);
783 }
784 #endif
785 
786 /* return length of latest Finished message we sent, copy to 'buf' */
787 size_t SSL_get_finished(const SSL *s, void *buf, size_t count)
788 {
789     size_t ret = 0;
790 
791     if (s->s3 != NULL) {
792         ret = s->s3->tmp.finish_md_len;
793         if (count > ret)
794             count = ret;
795         memcpy(buf, s->s3->tmp.finish_md, count);
796     }
797     return ret;
798 }
799 
800 /* return length of latest Finished message we expected, copy to 'buf' */
801 size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count)
802 {
803     size_t ret = 0;
804 
805     if (s->s3 != NULL) {
806         ret = s->s3->tmp.peer_finish_md_len;
807         if (count > ret)
808             count = ret;
809         memcpy(buf, s->s3->tmp.peer_finish_md, count);
810     }
811     return ret;
812 }
813 
814 int SSL_get_verify_mode(const SSL *s)
815 {
816     return (s->verify_mode);
817 }
818 
819 int SSL_get_verify_depth(const SSL *s)
820 {
821     return X509_VERIFY_PARAM_get_depth(s->param);
822 }
823 
824 int (*SSL_get_verify_callback(const SSL *s)) (int, X509_STORE_CTX *) {
825     return (s->verify_callback);
826 }
827 
828 int SSL_CTX_get_verify_mode(const SSL_CTX *ctx)
829 {
830     return (ctx->verify_mode);
831 }
832 
833 int SSL_CTX_get_verify_depth(const SSL_CTX *ctx)
834 {
835     return X509_VERIFY_PARAM_get_depth(ctx->param);
836 }
837 
838 int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx)) (int, X509_STORE_CTX *) {
839     return (ctx->default_verify_callback);
840 }
841 
842 void SSL_set_verify(SSL *s, int mode,
843                     int (*callback) (int ok, X509_STORE_CTX *ctx))
844 {
845     s->verify_mode = mode;
846     if (callback != NULL)
847         s->verify_callback = callback;
848 }
849 
850 void SSL_set_verify_depth(SSL *s, int depth)
851 {
852     X509_VERIFY_PARAM_set_depth(s->param, depth);
853 }
854 
855 void SSL_set_read_ahead(SSL *s, int yes)
856 {
857     s->read_ahead = yes;
858 }
859 
860 int SSL_get_read_ahead(const SSL *s)
861 {
862     return (s->read_ahead);
863 }
864 
865 int SSL_pending(const SSL *s)
866 {
867     /*
868      * SSL_pending cannot work properly if read-ahead is enabled
869      * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)), and it is
870      * impossible to fix since SSL_pending cannot report errors that may be
871      * observed while scanning the new data. (Note that SSL_pending() is
872      * often used as a boolean value, so we'd better not return -1.)
873      */
874     return (s->method->ssl_pending(s));
875 }
876 
877 X509 *SSL_get_peer_certificate(const SSL *s)
878 {
879     X509 *r;
880 
881     if ((s == NULL) || (s->session == NULL))
882         r = NULL;
883     else
884         r = s->session->peer;
885 
886     if (r == NULL)
887         return (r);
888 
889     CRYPTO_add(&r->references, 1, CRYPTO_LOCK_X509);
890 
891     return (r);
892 }
893 
894 STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s)
895 {
896     STACK_OF(X509) *r;
897 
898     if ((s == NULL) || (s->session == NULL)
899         || (s->session->sess_cert == NULL))
900         r = NULL;
901     else
902         r = s->session->sess_cert->cert_chain;
903 
904     /*
905      * If we are a client, cert_chain includes the peer's own certificate; if
906      * we are a server, it does not.
907      */
908 
909     return (r);
910 }
911 
912 /*
913  * Now in theory, since the calling process own 't' it should be safe to
914  * modify.  We need to be able to read f without being hassled
915  */
916 void SSL_copy_session_id(SSL *t, const SSL *f)
917 {
918     CERT *tmp;
919 
920     /* Do we need to to SSL locking? */
921     SSL_set_session(t, SSL_get_session(f));
922 
923     /*
924      * what if we are setup as SSLv2 but want to talk SSLv3 or vice-versa
925      */
926     if (t->method != f->method) {
927         t->method->ssl_free(t); /* cleanup current */
928         t->method = f->method;  /* change method */
929         t->method->ssl_new(t);  /* setup new */
930     }
931 
932     tmp = t->cert;
933     if (f->cert != NULL) {
934         CRYPTO_add(&f->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
935         t->cert = f->cert;
936     } else
937         t->cert = NULL;
938     if (tmp != NULL)
939         ssl_cert_free(tmp);
940     SSL_set_session_id_context(t, f->sid_ctx, f->sid_ctx_length);
941 }
942 
943 /* Fix this so it checks all the valid key/cert options */
944 int SSL_CTX_check_private_key(const SSL_CTX *ctx)
945 {
946     if ((ctx == NULL) ||
947         (ctx->cert == NULL) || (ctx->cert->key->x509 == NULL)) {
948         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
949                SSL_R_NO_CERTIFICATE_ASSIGNED);
950         return (0);
951     }
952     if (ctx->cert->key->privatekey == NULL) {
953         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
954                SSL_R_NO_PRIVATE_KEY_ASSIGNED);
955         return (0);
956     }
957     return (X509_check_private_key
958             (ctx->cert->key->x509, ctx->cert->key->privatekey));
959 }
960 
961 /* Fix this function so that it takes an optional type parameter */
962 int SSL_check_private_key(const SSL *ssl)
963 {
964     if (ssl == NULL) {
965         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
966         return (0);
967     }
968     if (ssl->cert == NULL) {
969         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
970         return 0;
971     }
972     if (ssl->cert->key->x509 == NULL) {
973         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
974         return (0);
975     }
976     if (ssl->cert->key->privatekey == NULL) {
977         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
978         return (0);
979     }
980     return (X509_check_private_key(ssl->cert->key->x509,
981                                    ssl->cert->key->privatekey));
982 }
983 
984 int SSL_accept(SSL *s)
985 {
986     if (s->handshake_func == 0)
987         /* Not properly initialized yet */
988         SSL_set_accept_state(s);
989 
990     return (s->method->ssl_accept(s));
991 }
992 
993 int SSL_connect(SSL *s)
994 {
995     if (s->handshake_func == 0)
996         /* Not properly initialized yet */
997         SSL_set_connect_state(s);
998 
999     return (s->method->ssl_connect(s));
1000 }
1001 
1002 long SSL_get_default_timeout(const SSL *s)
1003 {
1004     return (s->method->get_timeout());
1005 }
1006 
1007 int SSL_read(SSL *s, void *buf, int num)
1008 {
1009     if (s->handshake_func == 0) {
1010         SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
1011         return -1;
1012     }
1013 
1014     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1015         s->rwstate = SSL_NOTHING;
1016         return (0);
1017     }
1018     return (s->method->ssl_read(s, buf, num));
1019 }
1020 
1021 int SSL_peek(SSL *s, void *buf, int num)
1022 {
1023     if (s->handshake_func == 0) {
1024         SSLerr(SSL_F_SSL_PEEK, SSL_R_UNINITIALIZED);
1025         return -1;
1026     }
1027 
1028     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1029         return (0);
1030     }
1031     return (s->method->ssl_peek(s, buf, num));
1032 }
1033 
1034 int SSL_write(SSL *s, const void *buf, int num)
1035 {
1036     if (s->handshake_func == 0) {
1037         SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
1038         return -1;
1039     }
1040 
1041     if (s->shutdown & SSL_SENT_SHUTDOWN) {
1042         s->rwstate = SSL_NOTHING;
1043         SSLerr(SSL_F_SSL_WRITE, SSL_R_PROTOCOL_IS_SHUTDOWN);
1044         return (-1);
1045     }
1046     return (s->method->ssl_write(s, buf, num));
1047 }
1048 
1049 int SSL_shutdown(SSL *s)
1050 {
1051     /*
1052      * Note that this function behaves differently from what one might
1053      * expect.  Return values are 0 for no success (yet), 1 for success; but
1054      * calling it once is usually not enough, even if blocking I/O is used
1055      * (see ssl3_shutdown).
1056      */
1057 
1058     if (s->handshake_func == 0) {
1059         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
1060         return -1;
1061     }
1062 
1063     if (!SSL_in_init(s)) {
1064         return s->method->ssl_shutdown(s);
1065     } else {
1066         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_SHUTDOWN_WHILE_IN_INIT);
1067         return -1;
1068     }
1069 }
1070 
1071 int SSL_renegotiate(SSL *s)
1072 {
1073     if (s->renegotiate == 0)
1074         s->renegotiate = 1;
1075 
1076     s->new_session = 1;
1077 
1078     return (s->method->ssl_renegotiate(s));
1079 }
1080 
1081 int SSL_renegotiate_abbreviated(SSL *s)
1082 {
1083     if (s->renegotiate == 0)
1084         s->renegotiate = 1;
1085 
1086     s->new_session = 0;
1087 
1088     return (s->method->ssl_renegotiate(s));
1089 }
1090 
1091 int SSL_renegotiate_pending(SSL *s)
1092 {
1093     /*
1094      * becomes true when negotiation is requested; false again once a
1095      * handshake has finished
1096      */
1097     return (s->renegotiate != 0);
1098 }
1099 
1100 long SSL_ctrl(SSL *s, int cmd, long larg, void *parg)
1101 {
1102     long l;
1103 
1104     switch (cmd) {
1105     case SSL_CTRL_GET_READ_AHEAD:
1106         return (s->read_ahead);
1107     case SSL_CTRL_SET_READ_AHEAD:
1108         l = s->read_ahead;
1109         s->read_ahead = larg;
1110         return (l);
1111 
1112     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
1113         s->msg_callback_arg = parg;
1114         return 1;
1115 
1116     case SSL_CTRL_OPTIONS:
1117         return (s->options |= larg);
1118     case SSL_CTRL_CLEAR_OPTIONS:
1119         return (s->options &= ~larg);
1120     case SSL_CTRL_MODE:
1121         return (s->mode |= larg);
1122     case SSL_CTRL_CLEAR_MODE:
1123         return (s->mode &= ~larg);
1124     case SSL_CTRL_GET_MAX_CERT_LIST:
1125         return (s->max_cert_list);
1126     case SSL_CTRL_SET_MAX_CERT_LIST:
1127         l = s->max_cert_list;
1128         s->max_cert_list = larg;
1129         return (l);
1130     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
1131         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
1132             return 0;
1133         s->max_send_fragment = larg;
1134         return 1;
1135     case SSL_CTRL_GET_RI_SUPPORT:
1136         if (s->s3)
1137             return s->s3->send_connection_binding;
1138         else
1139             return 0;
1140     case SSL_CTRL_CERT_FLAGS:
1141         return (s->cert->cert_flags |= larg);
1142     case SSL_CTRL_CLEAR_CERT_FLAGS:
1143         return (s->cert->cert_flags &= ~larg);
1144 
1145     case SSL_CTRL_GET_RAW_CIPHERLIST:
1146         if (parg) {
1147             if (s->cert->ciphers_raw == NULL)
1148                 return 0;
1149             *(unsigned char **)parg = s->cert->ciphers_raw;
1150             return (int)s->cert->ciphers_rawlen;
1151         } else
1152             return ssl_put_cipher_by_char(s, NULL, NULL);
1153     default:
1154         return (s->method->ssl_ctrl(s, cmd, larg, parg));
1155     }
1156 }
1157 
1158 long SSL_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
1159 {
1160     switch (cmd) {
1161     case SSL_CTRL_SET_MSG_CALLBACK:
1162         s->msg_callback = (void (*)
1163                            (int write_p, int version, int content_type,
1164                             const void *buf, size_t len, SSL *ssl,
1165                             void *arg))(fp);
1166         return 1;
1167 
1168     default:
1169         return (s->method->ssl_callback_ctrl(s, cmd, fp));
1170     }
1171 }
1172 
1173 LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx)
1174 {
1175     return ctx->sessions;
1176 }
1177 
1178 long SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
1179 {
1180     long l;
1181     /* For some cases with ctx == NULL perform syntax checks */
1182     if (ctx == NULL) {
1183         switch (cmd) {
1184 #ifndef OPENSSL_NO_EC
1185         case SSL_CTRL_SET_CURVES_LIST:
1186             return tls1_set_curves_list(NULL, NULL, parg);
1187 #endif
1188         case SSL_CTRL_SET_SIGALGS_LIST:
1189         case SSL_CTRL_SET_CLIENT_SIGALGS_LIST:
1190             return tls1_set_sigalgs_list(NULL, parg, 0);
1191         default:
1192             return 0;
1193         }
1194     }
1195 
1196     switch (cmd) {
1197     case SSL_CTRL_GET_READ_AHEAD:
1198         return (ctx->read_ahead);
1199     case SSL_CTRL_SET_READ_AHEAD:
1200         l = ctx->read_ahead;
1201         ctx->read_ahead = larg;
1202         return (l);
1203 
1204     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
1205         ctx->msg_callback_arg = parg;
1206         return 1;
1207 
1208     case SSL_CTRL_GET_MAX_CERT_LIST:
1209         return (ctx->max_cert_list);
1210     case SSL_CTRL_SET_MAX_CERT_LIST:
1211         l = ctx->max_cert_list;
1212         ctx->max_cert_list = larg;
1213         return (l);
1214 
1215     case SSL_CTRL_SET_SESS_CACHE_SIZE:
1216         l = ctx->session_cache_size;
1217         ctx->session_cache_size = larg;
1218         return (l);
1219     case SSL_CTRL_GET_SESS_CACHE_SIZE:
1220         return (ctx->session_cache_size);
1221     case SSL_CTRL_SET_SESS_CACHE_MODE:
1222         l = ctx->session_cache_mode;
1223         ctx->session_cache_mode = larg;
1224         return (l);
1225     case SSL_CTRL_GET_SESS_CACHE_MODE:
1226         return (ctx->session_cache_mode);
1227 
1228     case SSL_CTRL_SESS_NUMBER:
1229         return (lh_SSL_SESSION_num_items(ctx->sessions));
1230     case SSL_CTRL_SESS_CONNECT:
1231         return (ctx->stats.sess_connect);
1232     case SSL_CTRL_SESS_CONNECT_GOOD:
1233         return (ctx->stats.sess_connect_good);
1234     case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
1235         return (ctx->stats.sess_connect_renegotiate);
1236     case SSL_CTRL_SESS_ACCEPT:
1237         return (ctx->stats.sess_accept);
1238     case SSL_CTRL_SESS_ACCEPT_GOOD:
1239         return (ctx->stats.sess_accept_good);
1240     case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
1241         return (ctx->stats.sess_accept_renegotiate);
1242     case SSL_CTRL_SESS_HIT:
1243         return (ctx->stats.sess_hit);
1244     case SSL_CTRL_SESS_CB_HIT:
1245         return (ctx->stats.sess_cb_hit);
1246     case SSL_CTRL_SESS_MISSES:
1247         return (ctx->stats.sess_miss);
1248     case SSL_CTRL_SESS_TIMEOUTS:
1249         return (ctx->stats.sess_timeout);
1250     case SSL_CTRL_SESS_CACHE_FULL:
1251         return (ctx->stats.sess_cache_full);
1252     case SSL_CTRL_OPTIONS:
1253         return (ctx->options |= larg);
1254     case SSL_CTRL_CLEAR_OPTIONS:
1255         return (ctx->options &= ~larg);
1256     case SSL_CTRL_MODE:
1257         return (ctx->mode |= larg);
1258     case SSL_CTRL_CLEAR_MODE:
1259         return (ctx->mode &= ~larg);
1260     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
1261         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
1262             return 0;
1263         ctx->max_send_fragment = larg;
1264         return 1;
1265     case SSL_CTRL_CERT_FLAGS:
1266         return (ctx->cert->cert_flags |= larg);
1267     case SSL_CTRL_CLEAR_CERT_FLAGS:
1268         return (ctx->cert->cert_flags &= ~larg);
1269     default:
1270         return (ctx->method->ssl_ctx_ctrl(ctx, cmd, larg, parg));
1271     }
1272 }
1273 
1274 long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
1275 {
1276     switch (cmd) {
1277     case SSL_CTRL_SET_MSG_CALLBACK:
1278         ctx->msg_callback = (void (*)
1279                              (int write_p, int version, int content_type,
1280                               const void *buf, size_t len, SSL *ssl,
1281                               void *arg))(fp);
1282         return 1;
1283 
1284     default:
1285         return (ctx->method->ssl_ctx_callback_ctrl(ctx, cmd, fp));
1286     }
1287 }
1288 
1289 int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
1290 {
1291     long l;
1292 
1293     l = a->id - b->id;
1294     if (l == 0L)
1295         return (0);
1296     else
1297         return ((l > 0) ? 1 : -1);
1298 }
1299 
1300 int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap,
1301                           const SSL_CIPHER *const *bp)
1302 {
1303     long l;
1304 
1305     l = (*ap)->id - (*bp)->id;
1306     if (l == 0L)
1307         return (0);
1308     else
1309         return ((l > 0) ? 1 : -1);
1310 }
1311 
1312 /** return a STACK of the ciphers available for the SSL and in order of
1313  * preference */
1314 STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s)
1315 {
1316     if (s != NULL) {
1317         if (s->cipher_list != NULL) {
1318             return (s->cipher_list);
1319         } else if ((s->ctx != NULL) && (s->ctx->cipher_list != NULL)) {
1320             return (s->ctx->cipher_list);
1321         }
1322     }
1323     return (NULL);
1324 }
1325 
1326 /** return a STACK of the ciphers available for the SSL and in order of
1327  * algorithm id */
1328 STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
1329 {
1330     if (s != NULL) {
1331         if (s->cipher_list_by_id != NULL) {
1332             return (s->cipher_list_by_id);
1333         } else if ((s->ctx != NULL) && (s->ctx->cipher_list_by_id != NULL)) {
1334             return (s->ctx->cipher_list_by_id);
1335         }
1336     }
1337     return (NULL);
1338 }
1339 
1340 /** The old interface to get the same thing as SSL_get_ciphers() */
1341 const char *SSL_get_cipher_list(const SSL *s, int n)
1342 {
1343     SSL_CIPHER *c;
1344     STACK_OF(SSL_CIPHER) *sk;
1345 
1346     if (s == NULL)
1347         return (NULL);
1348     sk = SSL_get_ciphers(s);
1349     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
1350         return (NULL);
1351     c = sk_SSL_CIPHER_value(sk, n);
1352     if (c == NULL)
1353         return (NULL);
1354     return (c->name);
1355 }
1356 
1357 /** specify the ciphers to be used by default by the SSL_CTX */
1358 int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
1359 {
1360     STACK_OF(SSL_CIPHER) *sk;
1361 
1362     sk = ssl_create_cipher_list(ctx->method, &ctx->cipher_list,
1363                                 &ctx->cipher_list_by_id, str, ctx->cert);
1364     /*
1365      * ssl_create_cipher_list may return an empty stack if it was unable to
1366      * find a cipher matching the given rule string (for example if the rule
1367      * string specifies a cipher which has been disabled). This is not an
1368      * error as far as ssl_create_cipher_list is concerned, and hence
1369      * ctx->cipher_list and ctx->cipher_list_by_id has been updated.
1370      */
1371     if (sk == NULL)
1372         return 0;
1373     else if (sk_SSL_CIPHER_num(sk) == 0) {
1374         SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
1375         return 0;
1376     }
1377     return 1;
1378 }
1379 
1380 /** specify the ciphers to be used by the SSL */
1381 int SSL_set_cipher_list(SSL *s, const char *str)
1382 {
1383     STACK_OF(SSL_CIPHER) *sk;
1384 
1385     sk = ssl_create_cipher_list(s->ctx->method, &s->cipher_list,
1386                                 &s->cipher_list_by_id, str, s->cert);
1387     /* see comment in SSL_CTX_set_cipher_list */
1388     if (sk == NULL)
1389         return 0;
1390     else if (sk_SSL_CIPHER_num(sk) == 0) {
1391         SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
1392         return 0;
1393     }
1394     return 1;
1395 }
1396 
1397 /* works well for SSLv2, not so good for SSLv3 */
1398 char *SSL_get_shared_ciphers(const SSL *s, char *buf, int len)
1399 {
1400     char *p;
1401     STACK_OF(SSL_CIPHER) *sk;
1402     SSL_CIPHER *c;
1403     int i;
1404 
1405     if ((s->session == NULL) || (s->session->ciphers == NULL) || (len < 2))
1406         return (NULL);
1407 
1408     p = buf;
1409     sk = s->session->ciphers;
1410 
1411     if (sk_SSL_CIPHER_num(sk) == 0)
1412         return NULL;
1413 
1414     for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
1415         int n;
1416 
1417         c = sk_SSL_CIPHER_value(sk, i);
1418         n = strlen(c->name);
1419         if (n + 1 > len) {
1420             if (p != buf)
1421                 --p;
1422             *p = '\0';
1423             return buf;
1424         }
1425         strcpy(p, c->name);
1426         p += n;
1427         *(p++) = ':';
1428         len -= n + 1;
1429     }
1430     p[-1] = '\0';
1431     return (buf);
1432 }
1433 
1434 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
1435                              unsigned char *p,
1436                              int (*put_cb) (const SSL_CIPHER *,
1437                                             unsigned char *))
1438 {
1439     int i, j = 0;
1440     SSL_CIPHER *c;
1441     CERT *ct = s->cert;
1442     unsigned char *q;
1443     int empty_reneg_info_scsv = !s->renegotiate;
1444     /* Set disabled masks for this session */
1445     ssl_set_client_disabled(s);
1446 
1447     if (sk == NULL)
1448         return (0);
1449     q = p;
1450     if (put_cb == NULL)
1451         put_cb = s->method->put_cipher_by_char;
1452 
1453     for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
1454         c = sk_SSL_CIPHER_value(sk, i);
1455         /* Skip disabled ciphers */
1456         if (c->algorithm_ssl & ct->mask_ssl ||
1457             c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a)
1458             continue;
1459 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
1460         if (c->id == SSL3_CK_SCSV) {
1461             if (!empty_reneg_info_scsv)
1462                 continue;
1463             else
1464                 empty_reneg_info_scsv = 0;
1465         }
1466 #endif
1467         j = put_cb(c, p);
1468         p += j;
1469     }
1470     /*
1471      * If p == q, no ciphers; caller indicates an error. Otherwise, add
1472      * applicable SCSVs.
1473      */
1474     if (p != q) {
1475         if (empty_reneg_info_scsv) {
1476             static SSL_CIPHER scsv = {
1477                 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
1478             };
1479             j = put_cb(&scsv, p);
1480             p += j;
1481 #ifdef OPENSSL_RI_DEBUG
1482             fprintf(stderr,
1483                     "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
1484 #endif
1485         }
1486         if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
1487             static SSL_CIPHER scsv = {
1488                 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
1489             };
1490             j = put_cb(&scsv, p);
1491             p += j;
1492         }
1493     }
1494 
1495     return (p - q);
1496 }
1497 
1498 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, unsigned char *p,
1499                                                int num,
1500                                                STACK_OF(SSL_CIPHER) **skp)
1501 {
1502     const SSL_CIPHER *c;
1503     STACK_OF(SSL_CIPHER) *sk;
1504     int i, n;
1505 
1506     if (s->s3)
1507         s->s3->send_connection_binding = 0;
1508 
1509     n = ssl_put_cipher_by_char(s, NULL, NULL);
1510     if (n == 0 || (num % n) != 0) {
1511         SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1512                SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
1513         return (NULL);
1514     }
1515     if ((skp == NULL) || (*skp == NULL)) {
1516         sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
1517         if(sk == NULL) {
1518             SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1519             return NULL;
1520         }
1521     } else {
1522         sk = *skp;
1523         sk_SSL_CIPHER_zero(sk);
1524     }
1525 
1526     if (s->cert->ciphers_raw)
1527         OPENSSL_free(s->cert->ciphers_raw);
1528     s->cert->ciphers_raw = BUF_memdup(p, num);
1529     if (s->cert->ciphers_raw == NULL) {
1530         SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1531         goto err;
1532     }
1533     s->cert->ciphers_rawlen = (size_t)num;
1534 
1535     for (i = 0; i < num; i += n) {
1536         /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
1537         if (s->s3 && (n != 3 || !p[0]) &&
1538             (p[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
1539             (p[n - 1] == (SSL3_CK_SCSV & 0xff))) {
1540             /* SCSV fatal if renegotiating */
1541             if (s->renegotiate) {
1542                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1543                        SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
1544                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1545                 goto err;
1546             }
1547             s->s3->send_connection_binding = 1;
1548             p += n;
1549 #ifdef OPENSSL_RI_DEBUG
1550             fprintf(stderr, "SCSV received by server\n");
1551 #endif
1552             continue;
1553         }
1554 
1555         /* Check for TLS_FALLBACK_SCSV */
1556         if ((n != 3 || !p[0]) &&
1557             (p[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
1558             (p[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
1559             /*
1560              * The SCSV indicates that the client previously tried a higher
1561              * version. Fail if the current version is an unexpected
1562              * downgrade.
1563              */
1564             if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) {
1565                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1566                        SSL_R_INAPPROPRIATE_FALLBACK);
1567                 if (s->s3)
1568                     ssl3_send_alert(s, SSL3_AL_FATAL,
1569                                     SSL_AD_INAPPROPRIATE_FALLBACK);
1570                 goto err;
1571             }
1572             p += n;
1573             continue;
1574         }
1575 
1576         c = ssl_get_cipher_by_char(s, p);
1577         p += n;
1578         if (c != NULL) {
1579             if (!sk_SSL_CIPHER_push(sk, c)) {
1580                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1581                 goto err;
1582             }
1583         }
1584     }
1585 
1586     if (skp != NULL)
1587         *skp = sk;
1588     return (sk);
1589  err:
1590     if ((skp == NULL) || (*skp == NULL))
1591         sk_SSL_CIPHER_free(sk);
1592     return (NULL);
1593 }
1594 
1595 #ifndef OPENSSL_NO_TLSEXT
1596 /** return a servername extension value if provided in Client Hello, or NULL.
1597  * So far, only host_name types are defined (RFC 3546).
1598  */
1599 
1600 const char *SSL_get_servername(const SSL *s, const int type)
1601 {
1602     if (type != TLSEXT_NAMETYPE_host_name)
1603         return NULL;
1604 
1605     return s->session && !s->tlsext_hostname ?
1606         s->session->tlsext_hostname : s->tlsext_hostname;
1607 }
1608 
1609 int SSL_get_servername_type(const SSL *s)
1610 {
1611     if (s->session
1612         && (!s->tlsext_hostname ? s->session->
1613             tlsext_hostname : s->tlsext_hostname))
1614         return TLSEXT_NAMETYPE_host_name;
1615     return -1;
1616 }
1617 
1618 /*
1619  * SSL_select_next_proto implements the standard protocol selection. It is
1620  * expected that this function is called from the callback set by
1621  * SSL_CTX_set_next_proto_select_cb. The protocol data is assumed to be a
1622  * vector of 8-bit, length prefixed byte strings. The length byte itself is
1623  * not included in the length. A byte string of length 0 is invalid. No byte
1624  * string may be truncated. The current, but experimental algorithm for
1625  * selecting the protocol is: 1) If the server doesn't support NPN then this
1626  * is indicated to the callback. In this case, the client application has to
1627  * abort the connection or have a default application level protocol. 2) If
1628  * the server supports NPN, but advertises an empty list then the client
1629  * selects the first protcol in its list, but indicates via the API that this
1630  * fallback case was enacted. 3) Otherwise, the client finds the first
1631  * protocol in the server's list that it supports and selects this protocol.
1632  * This is because it's assumed that the server has better information about
1633  * which protocol a client should use. 4) If the client doesn't support any
1634  * of the server's advertised protocols, then this is treated the same as
1635  * case 2. It returns either OPENSSL_NPN_NEGOTIATED if a common protocol was
1636  * found, or OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
1637  */
1638 int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
1639                           const unsigned char *server,
1640                           unsigned int server_len,
1641                           const unsigned char *client,
1642                           unsigned int client_len)
1643 {
1644     unsigned int i, j;
1645     const unsigned char *result;
1646     int status = OPENSSL_NPN_UNSUPPORTED;
1647 
1648     /*
1649      * For each protocol in server preference order, see if we support it.
1650      */
1651     for (i = 0; i < server_len;) {
1652         for (j = 0; j < client_len;) {
1653             if (server[i] == client[j] &&
1654                 memcmp(&server[i + 1], &client[j + 1], server[i]) == 0) {
1655                 /* We found a match */
1656                 result = &server[i];
1657                 status = OPENSSL_NPN_NEGOTIATED;
1658                 goto found;
1659             }
1660             j += client[j];
1661             j++;
1662         }
1663         i += server[i];
1664         i++;
1665     }
1666 
1667     /* There's no overlap between our protocols and the server's list. */
1668     result = client;
1669     status = OPENSSL_NPN_NO_OVERLAP;
1670 
1671  found:
1672     *out = (unsigned char *)result + 1;
1673     *outlen = result[0];
1674     return status;
1675 }
1676 
1677 # ifndef OPENSSL_NO_NEXTPROTONEG
1678 /*
1679  * SSL_get0_next_proto_negotiated sets *data and *len to point to the
1680  * client's requested protocol for this connection and returns 0. If the
1681  * client didn't request any protocol, then *data is set to NULL. Note that
1682  * the client can request any protocol it chooses. The value returned from
1683  * this function need not be a member of the list of supported protocols
1684  * provided by the callback.
1685  */
1686 void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data,
1687                                     unsigned *len)
1688 {
1689     *data = s->next_proto_negotiated;
1690     if (!*data) {
1691         *len = 0;
1692     } else {
1693         *len = s->next_proto_negotiated_len;
1694     }
1695 }
1696 
1697 /*
1698  * SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when
1699  * a TLS server needs a list of supported protocols for Next Protocol
1700  * Negotiation. The returned list must be in wire format.  The list is
1701  * returned by setting |out| to point to it and |outlen| to its length. This
1702  * memory will not be modified, but one should assume that the SSL* keeps a
1703  * reference to it. The callback should return SSL_TLSEXT_ERR_OK if it
1704  * wishes to advertise. Otherwise, no such extension will be included in the
1705  * ServerHello.
1706  */
1707 void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *ctx,
1708                                            int (*cb) (SSL *ssl,
1709                                                       const unsigned char
1710                                                       **out,
1711                                                       unsigned int *outlen,
1712                                                       void *arg), void *arg)
1713 {
1714     ctx->next_protos_advertised_cb = cb;
1715     ctx->next_protos_advertised_cb_arg = arg;
1716 }
1717 
1718 /*
1719  * SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
1720  * client needs to select a protocol from the server's provided list. |out|
1721  * must be set to point to the selected protocol (which may be within |in|).
1722  * The length of the protocol name must be written into |outlen|. The
1723  * server's advertised protocols are provided in |in| and |inlen|. The
1724  * callback can assume that |in| is syntactically valid. The client must
1725  * select a protocol. It is fatal to the connection if this callback returns
1726  * a value other than SSL_TLSEXT_ERR_OK.
1727  */
1728 void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx,
1729                                       int (*cb) (SSL *s, unsigned char **out,
1730                                                  unsigned char *outlen,
1731                                                  const unsigned char *in,
1732                                                  unsigned int inlen,
1733                                                  void *arg), void *arg)
1734 {
1735     ctx->next_proto_select_cb = cb;
1736     ctx->next_proto_select_cb_arg = arg;
1737 }
1738 # endif
1739 
1740 /*
1741  * SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
1742  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
1743  * length-prefixed strings). Returns 0 on success.
1744  */
1745 int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
1746                             unsigned protos_len)
1747 {
1748     if (ctx->alpn_client_proto_list)
1749         OPENSSL_free(ctx->alpn_client_proto_list);
1750 
1751     ctx->alpn_client_proto_list = OPENSSL_malloc(protos_len);
1752     if (!ctx->alpn_client_proto_list)
1753         return 1;
1754     memcpy(ctx->alpn_client_proto_list, protos, protos_len);
1755     ctx->alpn_client_proto_list_len = protos_len;
1756 
1757     return 0;
1758 }
1759 
1760 /*
1761  * SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
1762  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
1763  * length-prefixed strings). Returns 0 on success.
1764  */
1765 int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
1766                         unsigned protos_len)
1767 {
1768     if (ssl->alpn_client_proto_list)
1769         OPENSSL_free(ssl->alpn_client_proto_list);
1770 
1771     ssl->alpn_client_proto_list = OPENSSL_malloc(protos_len);
1772     if (!ssl->alpn_client_proto_list)
1773         return 1;
1774     memcpy(ssl->alpn_client_proto_list, protos, protos_len);
1775     ssl->alpn_client_proto_list_len = protos_len;
1776 
1777     return 0;
1778 }
1779 
1780 /*
1781  * SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is
1782  * called during ClientHello processing in order to select an ALPN protocol
1783  * from the client's list of offered protocols.
1784  */
1785 void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
1786                                 int (*cb) (SSL *ssl,
1787                                            const unsigned char **out,
1788                                            unsigned char *outlen,
1789                                            const unsigned char *in,
1790                                            unsigned int inlen,
1791                                            void *arg), void *arg)
1792 {
1793     ctx->alpn_select_cb = cb;
1794     ctx->alpn_select_cb_arg = arg;
1795 }
1796 
1797 /*
1798  * SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from
1799  * |ssl|. On return it sets |*data| to point to |*len| bytes of protocol name
1800  * (not including the leading length-prefix byte). If the server didn't
1801  * respond with a negotiated protocol then |*len| will be zero.
1802  */
1803 void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
1804                             unsigned *len)
1805 {
1806     *data = NULL;
1807     if (ssl->s3)
1808         *data = ssl->s3->alpn_selected;
1809     if (*data == NULL)
1810         *len = 0;
1811     else
1812         *len = ssl->s3->alpn_selected_len;
1813 }
1814 
1815 #endif                          /* !OPENSSL_NO_TLSEXT */
1816 
1817 int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
1818                                const char *label, size_t llen,
1819                                const unsigned char *p, size_t plen,
1820                                int use_context)
1821 {
1822     if (s->version < TLS1_VERSION)
1823         return -1;
1824 
1825     return s->method->ssl3_enc->export_keying_material(s, out, olen, label,
1826                                                        llen, p, plen,
1827                                                        use_context);
1828 }
1829 
1830 static unsigned long ssl_session_hash(const SSL_SESSION *a)
1831 {
1832     unsigned long l;
1833 
1834     l = (unsigned long)
1835         ((unsigned int)a->session_id[0]) |
1836         ((unsigned int)a->session_id[1] << 8L) |
1837         ((unsigned long)a->session_id[2] << 16L) |
1838         ((unsigned long)a->session_id[3] << 24L);
1839     return (l);
1840 }
1841 
1842 /*
1843  * NB: If this function (or indeed the hash function which uses a sort of
1844  * coarser function than this one) is changed, ensure
1845  * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on
1846  * being able to construct an SSL_SESSION that will collide with any existing
1847  * session with a matching session ID.
1848  */
1849 static int ssl_session_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
1850 {
1851     if (a->ssl_version != b->ssl_version)
1852         return (1);
1853     if (a->session_id_length != b->session_id_length)
1854         return (1);
1855     return (memcmp(a->session_id, b->session_id, a->session_id_length));
1856 }
1857 
1858 /*
1859  * These wrapper functions should remain rather than redeclaring
1860  * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
1861  * variable. The reason is that the functions aren't static, they're exposed
1862  * via ssl.h.
1863  */
1864 static IMPLEMENT_LHASH_HASH_FN(ssl_session, SSL_SESSION)
1865 static IMPLEMENT_LHASH_COMP_FN(ssl_session, SSL_SESSION)
1866 
1867 SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
1868 {
1869     SSL_CTX *ret = NULL;
1870 
1871     if (meth == NULL) {
1872         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_NULL_SSL_METHOD_PASSED);
1873         return (NULL);
1874     }
1875 #ifdef OPENSSL_FIPS
1876     if (FIPS_mode() && (meth->version < TLS1_VERSION)) {
1877         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
1878         return NULL;
1879     }
1880 #endif
1881 
1882     if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0) {
1883         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
1884         goto err;
1885     }
1886     ret = (SSL_CTX *)OPENSSL_malloc(sizeof(SSL_CTX));
1887     if (ret == NULL)
1888         goto err;
1889 
1890     memset(ret, 0, sizeof(SSL_CTX));
1891 
1892     ret->method = meth;
1893 
1894     ret->cert_store = NULL;
1895     ret->session_cache_mode = SSL_SESS_CACHE_SERVER;
1896     ret->session_cache_size = SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
1897     ret->session_cache_head = NULL;
1898     ret->session_cache_tail = NULL;
1899 
1900     /* We take the system default */
1901     ret->session_timeout = meth->get_timeout();
1902 
1903     ret->new_session_cb = 0;
1904     ret->remove_session_cb = 0;
1905     ret->get_session_cb = 0;
1906     ret->generate_session_id = 0;
1907 
1908     memset((char *)&ret->stats, 0, sizeof(ret->stats));
1909 
1910     ret->references = 1;
1911     ret->quiet_shutdown = 0;
1912 
1913 /*  ret->cipher=NULL;*/
1914 /*-
1915     ret->s2->challenge=NULL;
1916     ret->master_key=NULL;
1917     ret->key_arg=NULL;
1918     ret->s2->conn_id=NULL; */
1919 
1920     ret->info_callback = NULL;
1921 
1922     ret->app_verify_callback = 0;
1923     ret->app_verify_arg = NULL;
1924 
1925     ret->max_cert_list = SSL_MAX_CERT_LIST_DEFAULT;
1926     ret->read_ahead = 0;
1927     ret->msg_callback = 0;
1928     ret->msg_callback_arg = NULL;
1929     ret->verify_mode = SSL_VERIFY_NONE;
1930 #if 0
1931     ret->verify_depth = -1;     /* Don't impose a limit (but x509_lu.c does) */
1932 #endif
1933     ret->sid_ctx_length = 0;
1934     ret->default_verify_callback = NULL;
1935     if ((ret->cert = ssl_cert_new()) == NULL)
1936         goto err;
1937 
1938     ret->default_passwd_callback = 0;
1939     ret->default_passwd_callback_userdata = NULL;
1940     ret->client_cert_cb = 0;
1941     ret->app_gen_cookie_cb = 0;
1942     ret->app_verify_cookie_cb = 0;
1943 
1944     ret->sessions = lh_SSL_SESSION_new();
1945     if (ret->sessions == NULL)
1946         goto err;
1947     ret->cert_store = X509_STORE_new();
1948     if (ret->cert_store == NULL)
1949         goto err;
1950 
1951     ssl_create_cipher_list(ret->method,
1952                            &ret->cipher_list, &ret->cipher_list_by_id,
1953                            meth->version ==
1954                            SSL2_VERSION ? "SSLv2" : SSL_DEFAULT_CIPHER_LIST,
1955                            ret->cert);
1956     if (ret->cipher_list == NULL || sk_SSL_CIPHER_num(ret->cipher_list) <= 0) {
1957         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_LIBRARY_HAS_NO_CIPHERS);
1958         goto err2;
1959     }
1960 
1961     ret->param = X509_VERIFY_PARAM_new();
1962     if (!ret->param)
1963         goto err;
1964 
1965     if ((ret->rsa_md5 = EVP_get_digestbyname("ssl2-md5")) == NULL) {
1966         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL2_MD5_ROUTINES);
1967         goto err2;
1968     }
1969     if ((ret->md5 = EVP_get_digestbyname("ssl3-md5")) == NULL) {
1970         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
1971         goto err2;
1972     }
1973     if ((ret->sha1 = EVP_get_digestbyname("ssl3-sha1")) == NULL) {
1974         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
1975         goto err2;
1976     }
1977 
1978     if ((ret->client_CA = sk_X509_NAME_new_null()) == NULL)
1979         goto err;
1980 
1981     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data);
1982 
1983     ret->extra_certs = NULL;
1984     /* No compression for DTLS */
1985     if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS))
1986         ret->comp_methods = SSL_COMP_get_compression_methods();
1987 
1988     ret->max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
1989 
1990 #ifndef OPENSSL_NO_TLSEXT
1991     ret->tlsext_servername_callback = 0;
1992     ret->tlsext_servername_arg = NULL;
1993     /* Setup RFC4507 ticket keys */
1994     if ((RAND_pseudo_bytes(ret->tlsext_tick_key_name, 16) <= 0)
1995         || (RAND_bytes(ret->tlsext_tick_hmac_key, 16) <= 0)
1996         || (RAND_bytes(ret->tlsext_tick_aes_key, 16) <= 0))
1997         ret->options |= SSL_OP_NO_TICKET;
1998 
1999     ret->tlsext_status_cb = 0;
2000     ret->tlsext_status_arg = NULL;
2001 
2002 # ifndef OPENSSL_NO_NEXTPROTONEG
2003     ret->next_protos_advertised_cb = 0;
2004     ret->next_proto_select_cb = 0;
2005 # endif
2006 #endif
2007 #ifndef OPENSSL_NO_PSK
2008     ret->psk_identity_hint = NULL;
2009     ret->psk_client_callback = NULL;
2010     ret->psk_server_callback = NULL;
2011 #endif
2012 #ifndef OPENSSL_NO_SRP
2013     SSL_CTX_SRP_CTX_init(ret);
2014 #endif
2015 #ifndef OPENSSL_NO_BUF_FREELISTS
2016     ret->freelist_max_len = SSL_MAX_BUF_FREELIST_LEN_DEFAULT;
2017     ret->rbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
2018     if (!ret->rbuf_freelist)
2019         goto err;
2020     ret->rbuf_freelist->chunklen = 0;
2021     ret->rbuf_freelist->len = 0;
2022     ret->rbuf_freelist->head = NULL;
2023     ret->wbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
2024     if (!ret->wbuf_freelist) {
2025         OPENSSL_free(ret->rbuf_freelist);
2026         goto err;
2027     }
2028     ret->wbuf_freelist->chunklen = 0;
2029     ret->wbuf_freelist->len = 0;
2030     ret->wbuf_freelist->head = NULL;
2031 #endif
2032 #ifndef OPENSSL_NO_ENGINE
2033     ret->client_cert_engine = NULL;
2034 # ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
2035 #  define eng_strx(x)     #x
2036 #  define eng_str(x)      eng_strx(x)
2037     /* Use specific client engine automatically... ignore errors */
2038     {
2039         ENGINE *eng;
2040         eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
2041         if (!eng) {
2042             ERR_clear_error();
2043             ENGINE_load_builtin_engines();
2044             eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
2045         }
2046         if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
2047             ERR_clear_error();
2048     }
2049 # endif
2050 #endif
2051     /*
2052      * Default is to connect to non-RI servers. When RI is more widely
2053      * deployed might change this.
2054      */
2055     ret->options |= SSL_OP_LEGACY_SERVER_CONNECT;
2056 
2057     /*
2058      * Disable SSLv2 by default, callers that want to enable SSLv2 will have to
2059      * explicitly clear this option via either of SSL_CTX_clear_options() or
2060      * SSL_clear_options().
2061      */
2062     ret->options |= SSL_OP_NO_SSLv2;
2063 
2064     return (ret);
2065  err:
2066     SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
2067  err2:
2068     if (ret != NULL)
2069         SSL_CTX_free(ret);
2070     return (NULL);
2071 }
2072 
2073 #if 0
2074 static void SSL_COMP_free(SSL_COMP *comp)
2075 {
2076     OPENSSL_free(comp);
2077 }
2078 #endif
2079 
2080 #ifndef OPENSSL_NO_BUF_FREELISTS
2081 static void ssl_buf_freelist_free(SSL3_BUF_FREELIST *list)
2082 {
2083     SSL3_BUF_FREELIST_ENTRY *ent, *next;
2084     for (ent = list->head; ent; ent = next) {
2085         next = ent->next;
2086         OPENSSL_free(ent);
2087     }
2088     OPENSSL_free(list);
2089 }
2090 #endif
2091 
2092 void SSL_CTX_free(SSL_CTX *a)
2093 {
2094     int i;
2095 
2096     if (a == NULL)
2097         return;
2098 
2099     i = CRYPTO_add(&a->references, -1, CRYPTO_LOCK_SSL_CTX);
2100 #ifdef REF_PRINT
2101     REF_PRINT("SSL_CTX", a);
2102 #endif
2103     if (i > 0)
2104         return;
2105 #ifdef REF_CHECK
2106     if (i < 0) {
2107         fprintf(stderr, "SSL_CTX_free, bad reference count\n");
2108         abort();                /* ok */
2109     }
2110 #endif
2111 
2112     if (a->param)
2113         X509_VERIFY_PARAM_free(a->param);
2114 
2115     /*
2116      * Free internal session cache. However: the remove_cb() may reference
2117      * the ex_data of SSL_CTX, thus the ex_data store can only be removed
2118      * after the sessions were flushed.
2119      * As the ex_data handling routines might also touch the session cache,
2120      * the most secure solution seems to be: empty (flush) the cache, then
2121      * free ex_data, then finally free the cache.
2122      * (See ticket [openssl.org #212].)
2123      */
2124     if (a->sessions != NULL)
2125         SSL_CTX_flush_sessions(a, 0);
2126 
2127     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);
2128 
2129     if (a->sessions != NULL)
2130         lh_SSL_SESSION_free(a->sessions);
2131 
2132     if (a->cert_store != NULL)
2133         X509_STORE_free(a->cert_store);
2134     if (a->cipher_list != NULL)
2135         sk_SSL_CIPHER_free(a->cipher_list);
2136     if (a->cipher_list_by_id != NULL)
2137         sk_SSL_CIPHER_free(a->cipher_list_by_id);
2138     if (a->cert != NULL)
2139         ssl_cert_free(a->cert);
2140     if (a->client_CA != NULL)
2141         sk_X509_NAME_pop_free(a->client_CA, X509_NAME_free);
2142     if (a->extra_certs != NULL)
2143         sk_X509_pop_free(a->extra_certs, X509_free);
2144 #if 0                           /* This should never be done, since it
2145                                  * removes a global database */
2146     if (a->comp_methods != NULL)
2147         sk_SSL_COMP_pop_free(a->comp_methods, SSL_COMP_free);
2148 #else
2149     a->comp_methods = NULL;
2150 #endif
2151 
2152 #ifndef OPENSSL_NO_SRTP
2153     if (a->srtp_profiles)
2154         sk_SRTP_PROTECTION_PROFILE_free(a->srtp_profiles);
2155 #endif
2156 
2157 #ifndef OPENSSL_NO_PSK
2158     if (a->psk_identity_hint)
2159         OPENSSL_free(a->psk_identity_hint);
2160 #endif
2161 #ifndef OPENSSL_NO_SRP
2162     SSL_CTX_SRP_CTX_free(a);
2163 #endif
2164 #ifndef OPENSSL_NO_ENGINE
2165     if (a->client_cert_engine)
2166         ENGINE_finish(a->client_cert_engine);
2167 #endif
2168 
2169 #ifndef OPENSSL_NO_BUF_FREELISTS
2170     if (a->wbuf_freelist)
2171         ssl_buf_freelist_free(a->wbuf_freelist);
2172     if (a->rbuf_freelist)
2173         ssl_buf_freelist_free(a->rbuf_freelist);
2174 #endif
2175 #ifndef OPENSSL_NO_TLSEXT
2176 # ifndef OPENSSL_NO_EC
2177     if (a->tlsext_ecpointformatlist)
2178         OPENSSL_free(a->tlsext_ecpointformatlist);
2179     if (a->tlsext_ellipticcurvelist)
2180         OPENSSL_free(a->tlsext_ellipticcurvelist);
2181 # endif                         /* OPENSSL_NO_EC */
2182     if (a->alpn_client_proto_list != NULL)
2183         OPENSSL_free(a->alpn_client_proto_list);
2184 #endif
2185 
2186     OPENSSL_free(a);
2187 }
2188 
2189 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
2190 {
2191     ctx->default_passwd_callback = cb;
2192 }
2193 
2194 void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u)
2195 {
2196     ctx->default_passwd_callback_userdata = u;
2197 }
2198 
2199 void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
2200                                       int (*cb) (X509_STORE_CTX *, void *),
2201                                       void *arg)
2202 {
2203     ctx->app_verify_callback = cb;
2204     ctx->app_verify_arg = arg;
2205 }
2206 
2207 void SSL_CTX_set_verify(SSL_CTX *ctx, int mode,
2208                         int (*cb) (int, X509_STORE_CTX *))
2209 {
2210     ctx->verify_mode = mode;
2211     ctx->default_verify_callback = cb;
2212 }
2213 
2214 void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth)
2215 {
2216     X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2217 }
2218 
2219 void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb) (SSL *ssl, void *arg),
2220                          void *arg)
2221 {
2222     ssl_cert_set_cert_cb(c->cert, cb, arg);
2223 }
2224 
2225 void SSL_set_cert_cb(SSL *s, int (*cb) (SSL *ssl, void *arg), void *arg)
2226 {
2227     ssl_cert_set_cert_cb(s->cert, cb, arg);
2228 }
2229 
2230 void ssl_set_cert_masks(CERT *c, const SSL_CIPHER *cipher)
2231 {
2232     CERT_PKEY *cpk;
2233     int rsa_enc, rsa_tmp, rsa_sign, dh_tmp, dh_rsa, dh_dsa, dsa_sign;
2234     int rsa_enc_export, dh_rsa_export, dh_dsa_export;
2235     int rsa_tmp_export, dh_tmp_export, kl;
2236     unsigned long mask_k, mask_a, emask_k, emask_a;
2237 #ifndef OPENSSL_NO_ECDSA
2238     int have_ecc_cert, ecdsa_ok, ecc_pkey_size;
2239 #endif
2240 #ifndef OPENSSL_NO_ECDH
2241     int have_ecdh_tmp, ecdh_ok;
2242 #endif
2243 #ifndef OPENSSL_NO_EC
2244     X509 *x = NULL;
2245     EVP_PKEY *ecc_pkey = NULL;
2246     int signature_nid = 0, pk_nid = 0, md_nid = 0;
2247 #endif
2248     if (c == NULL)
2249         return;
2250 
2251     kl = SSL_C_EXPORT_PKEYLENGTH(cipher);
2252 
2253 #ifndef OPENSSL_NO_RSA
2254     rsa_tmp = (c->rsa_tmp != NULL || c->rsa_tmp_cb != NULL);
2255     rsa_tmp_export = (c->rsa_tmp_cb != NULL ||
2256                       (rsa_tmp && RSA_size(c->rsa_tmp) * 8 <= kl));
2257 #else
2258     rsa_tmp = rsa_tmp_export = 0;
2259 #endif
2260 #ifndef OPENSSL_NO_DH
2261     dh_tmp = (c->dh_tmp != NULL || c->dh_tmp_cb != NULL);
2262     dh_tmp_export = (c->dh_tmp_cb != NULL ||
2263                      (dh_tmp && DH_size(c->dh_tmp) * 8 <= kl));
2264 #else
2265     dh_tmp = dh_tmp_export = 0;
2266 #endif
2267 
2268 #ifndef OPENSSL_NO_ECDH
2269     have_ecdh_tmp = (c->ecdh_tmp || c->ecdh_tmp_cb || c->ecdh_tmp_auto);
2270 #endif
2271     cpk = &(c->pkeys[SSL_PKEY_RSA_ENC]);
2272     rsa_enc = cpk->valid_flags & CERT_PKEY_VALID;
2273     rsa_enc_export = (rsa_enc && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2274     cpk = &(c->pkeys[SSL_PKEY_RSA_SIGN]);
2275     rsa_sign = cpk->valid_flags & CERT_PKEY_SIGN;
2276     cpk = &(c->pkeys[SSL_PKEY_DSA_SIGN]);
2277     dsa_sign = cpk->valid_flags & CERT_PKEY_SIGN;
2278     cpk = &(c->pkeys[SSL_PKEY_DH_RSA]);
2279     dh_rsa = cpk->valid_flags & CERT_PKEY_VALID;
2280     dh_rsa_export = (dh_rsa && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2281     cpk = &(c->pkeys[SSL_PKEY_DH_DSA]);
2282 /* FIX THIS EAY EAY EAY */
2283     dh_dsa = cpk->valid_flags & CERT_PKEY_VALID;
2284     dh_dsa_export = (dh_dsa && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2285     cpk = &(c->pkeys[SSL_PKEY_ECC]);
2286 #ifndef OPENSSL_NO_EC
2287     have_ecc_cert = cpk->valid_flags & CERT_PKEY_VALID;
2288 #endif
2289     mask_k = 0;
2290     mask_a = 0;
2291     emask_k = 0;
2292     emask_a = 0;
2293 
2294 #ifdef CIPHER_DEBUG
2295     fprintf(stderr,
2296             "rt=%d rte=%d dht=%d ecdht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
2297             rsa_tmp, rsa_tmp_export, dh_tmp, have_ecdh_tmp, rsa_enc,
2298             rsa_enc_export, rsa_sign, dsa_sign, dh_rsa, dh_dsa);
2299 #endif
2300 
2301     cpk = &(c->pkeys[SSL_PKEY_GOST01]);
2302     if (cpk->x509 != NULL && cpk->privatekey != NULL) {
2303         mask_k |= SSL_kGOST;
2304         mask_a |= SSL_aGOST01;
2305     }
2306     cpk = &(c->pkeys[SSL_PKEY_GOST94]);
2307     if (cpk->x509 != NULL && cpk->privatekey != NULL) {
2308         mask_k |= SSL_kGOST;
2309         mask_a |= SSL_aGOST94;
2310     }
2311 
2312     if (rsa_enc || (rsa_tmp && rsa_sign))
2313         mask_k |= SSL_kRSA;
2314     if (rsa_enc_export || (rsa_tmp_export && (rsa_sign || rsa_enc)))
2315         emask_k |= SSL_kRSA;
2316 
2317 #if 0
2318     /* The match needs to be both kEDH and aRSA or aDSA, so don't worry */
2319     if ((dh_tmp || dh_rsa || dh_dsa) && (rsa_enc || rsa_sign || dsa_sign))
2320         mask_k |= SSL_kEDH;
2321     if ((dh_tmp_export || dh_rsa_export || dh_dsa_export) &&
2322         (rsa_enc || rsa_sign || dsa_sign))
2323         emask_k |= SSL_kEDH;
2324 #endif
2325 
2326     if (dh_tmp_export)
2327         emask_k |= SSL_kEDH;
2328 
2329     if (dh_tmp)
2330         mask_k |= SSL_kEDH;
2331 
2332     if (dh_rsa)
2333         mask_k |= SSL_kDHr;
2334     if (dh_rsa_export)
2335         emask_k |= SSL_kDHr;
2336 
2337     if (dh_dsa)
2338         mask_k |= SSL_kDHd;
2339     if (dh_dsa_export)
2340         emask_k |= SSL_kDHd;
2341 
2342     if (mask_k & (SSL_kDHr | SSL_kDHd))
2343         mask_a |= SSL_aDH;
2344 
2345     if (rsa_enc || rsa_sign) {
2346         mask_a |= SSL_aRSA;
2347         emask_a |= SSL_aRSA;
2348     }
2349 
2350     if (dsa_sign) {
2351         mask_a |= SSL_aDSS;
2352         emask_a |= SSL_aDSS;
2353     }
2354 
2355     mask_a |= SSL_aNULL;
2356     emask_a |= SSL_aNULL;
2357 
2358 #ifndef OPENSSL_NO_KRB5
2359     mask_k |= SSL_kKRB5;
2360     mask_a |= SSL_aKRB5;
2361     emask_k |= SSL_kKRB5;
2362     emask_a |= SSL_aKRB5;
2363 #endif
2364 
2365     /*
2366      * An ECC certificate may be usable for ECDH and/or ECDSA cipher suites
2367      * depending on the key usage extension.
2368      */
2369 #ifndef OPENSSL_NO_EC
2370     if (have_ecc_cert) {
2371         cpk = &c->pkeys[SSL_PKEY_ECC];
2372         x = cpk->x509;
2373         /* This call populates extension flags (ex_flags) */
2374         X509_check_purpose(x, -1, 0);
2375 # ifndef OPENSSL_NO_ECDH
2376         ecdh_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
2377             (x->ex_kusage & X509v3_KU_KEY_AGREEMENT) : 1;
2378 # endif
2379         ecdsa_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
2380             (x->ex_kusage & X509v3_KU_DIGITAL_SIGNATURE) : 1;
2381         if (!(cpk->valid_flags & CERT_PKEY_SIGN))
2382             ecdsa_ok = 0;
2383         ecc_pkey = X509_get_pubkey(x);
2384         ecc_pkey_size = (ecc_pkey != NULL) ? EVP_PKEY_bits(ecc_pkey) : 0;
2385         EVP_PKEY_free(ecc_pkey);
2386         if ((x->sig_alg) && (x->sig_alg->algorithm)) {
2387             signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
2388             OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
2389         }
2390 # ifndef OPENSSL_NO_ECDH
2391         if (ecdh_ok) {
2392 
2393             if (pk_nid == NID_rsaEncryption || pk_nid == NID_rsa) {
2394                 mask_k |= SSL_kECDHr;
2395                 mask_a |= SSL_aECDH;
2396                 if (ecc_pkey_size <= 163) {
2397                     emask_k |= SSL_kECDHr;
2398                     emask_a |= SSL_aECDH;
2399                 }
2400             }
2401 
2402             if (pk_nid == NID_X9_62_id_ecPublicKey) {
2403                 mask_k |= SSL_kECDHe;
2404                 mask_a |= SSL_aECDH;
2405                 if (ecc_pkey_size <= 163) {
2406                     emask_k |= SSL_kECDHe;
2407                     emask_a |= SSL_aECDH;
2408                 }
2409             }
2410         }
2411 # endif
2412 # ifndef OPENSSL_NO_ECDSA
2413         if (ecdsa_ok) {
2414             mask_a |= SSL_aECDSA;
2415             emask_a |= SSL_aECDSA;
2416         }
2417 # endif
2418     }
2419 #endif
2420 
2421 #ifndef OPENSSL_NO_ECDH
2422     if (have_ecdh_tmp) {
2423         mask_k |= SSL_kEECDH;
2424         emask_k |= SSL_kEECDH;
2425     }
2426 #endif
2427 
2428 #ifndef OPENSSL_NO_PSK
2429     mask_k |= SSL_kPSK;
2430     mask_a |= SSL_aPSK;
2431     emask_k |= SSL_kPSK;
2432     emask_a |= SSL_aPSK;
2433 #endif
2434 
2435     c->mask_k = mask_k;
2436     c->mask_a = mask_a;
2437     c->export_mask_k = emask_k;
2438     c->export_mask_a = emask_a;
2439     c->valid = 1;
2440 }
2441 
2442 /* This handy macro borrowed from crypto/x509v3/v3_purp.c */
2443 #define ku_reject(x, usage) \
2444         (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
2445 
2446 #ifndef OPENSSL_NO_EC
2447 
2448 int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
2449 {
2450     unsigned long alg_k, alg_a;
2451     EVP_PKEY *pkey = NULL;
2452     int keysize = 0;
2453     int signature_nid = 0, md_nid = 0, pk_nid = 0;
2454     const SSL_CIPHER *cs = s->s3->tmp.new_cipher;
2455 
2456     alg_k = cs->algorithm_mkey;
2457     alg_a = cs->algorithm_auth;
2458 
2459     if (SSL_C_IS_EXPORT(cs)) {
2460         /* ECDH key length in export ciphers must be <= 163 bits */
2461         pkey = X509_get_pubkey(x);
2462         if (pkey == NULL)
2463             return 0;
2464         keysize = EVP_PKEY_bits(pkey);
2465         EVP_PKEY_free(pkey);
2466         if (keysize > 163)
2467             return 0;
2468     }
2469 
2470     /* This call populates the ex_flags field correctly */
2471     X509_check_purpose(x, -1, 0);
2472     if ((x->sig_alg) && (x->sig_alg->algorithm)) {
2473         signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
2474         OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
2475     }
2476     if (alg_k & SSL_kECDHe || alg_k & SSL_kECDHr) {
2477         /* key usage, if present, must allow key agreement */
2478         if (ku_reject(x, X509v3_KU_KEY_AGREEMENT)) {
2479             SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2480                    SSL_R_ECC_CERT_NOT_FOR_KEY_AGREEMENT);
2481             return 0;
2482         }
2483         if ((alg_k & SSL_kECDHe) && TLS1_get_version(s) < TLS1_2_VERSION) {
2484             /* signature alg must be ECDSA */
2485             if (pk_nid != NID_X9_62_id_ecPublicKey) {
2486                 SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2487                        SSL_R_ECC_CERT_SHOULD_HAVE_SHA1_SIGNATURE);
2488                 return 0;
2489             }
2490         }
2491         if ((alg_k & SSL_kECDHr) && TLS1_get_version(s) < TLS1_2_VERSION) {
2492             /* signature alg must be RSA */
2493 
2494             if (pk_nid != NID_rsaEncryption && pk_nid != NID_rsa) {
2495                 SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2496                        SSL_R_ECC_CERT_SHOULD_HAVE_RSA_SIGNATURE);
2497                 return 0;
2498             }
2499         }
2500     }
2501     if (alg_a & SSL_aECDSA) {
2502         /* key usage, if present, must allow signing */
2503         if (ku_reject(x, X509v3_KU_DIGITAL_SIGNATURE)) {
2504             SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2505                    SSL_R_ECC_CERT_NOT_FOR_SIGNING);
2506             return 0;
2507         }
2508     }
2509 
2510     return 1;                   /* all checks are ok */
2511 }
2512 
2513 #endif
2514 
2515 static int ssl_get_server_cert_index(const SSL *s)
2516 {
2517     int idx;
2518     idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
2519     if (idx == SSL_PKEY_RSA_ENC && !s->cert->pkeys[SSL_PKEY_RSA_ENC].x509)
2520         idx = SSL_PKEY_RSA_SIGN;
2521     if (idx == -1)
2522         SSLerr(SSL_F_SSL_GET_SERVER_CERT_INDEX, ERR_R_INTERNAL_ERROR);
2523     return idx;
2524 }
2525 
2526 CERT_PKEY *ssl_get_server_send_pkey(const SSL *s)
2527 {
2528     CERT *c;
2529     int i;
2530 
2531     c = s->cert;
2532     if (!s->s3 || !s->s3->tmp.new_cipher)
2533         return NULL;
2534     ssl_set_cert_masks(c, s->s3->tmp.new_cipher);
2535 
2536 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
2537     /*
2538      * Broken protocol test: return last used certificate: which may mismatch
2539      * the one expected.
2540      */
2541     if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
2542         return c->key;
2543 #endif
2544 
2545     i = ssl_get_server_cert_index(s);
2546 
2547     /* This may or may not be an error. */
2548     if (i < 0)
2549         return NULL;
2550 
2551     /* May be NULL. */
2552     return &c->pkeys[i];
2553 }
2554 
2555 EVP_PKEY *ssl_get_sign_pkey(SSL *s, const SSL_CIPHER *cipher,
2556                             const EVP_MD **pmd)
2557 {
2558     unsigned long alg_a;
2559     CERT *c;
2560     int idx = -1;
2561 
2562     alg_a = cipher->algorithm_auth;
2563     c = s->cert;
2564 
2565 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
2566     /*
2567      * Broken protocol test: use last key: which may mismatch the one
2568      * expected.
2569      */
2570     if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
2571         idx = c->key - c->pkeys;
2572     else
2573 #endif
2574 
2575     if ((alg_a & SSL_aDSS) &&
2576             (c->pkeys[SSL_PKEY_DSA_SIGN].privatekey != NULL))
2577         idx = SSL_PKEY_DSA_SIGN;
2578     else if (alg_a & SSL_aRSA) {
2579         if (c->pkeys[SSL_PKEY_RSA_SIGN].privatekey != NULL)
2580             idx = SSL_PKEY_RSA_SIGN;
2581         else if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey != NULL)
2582             idx = SSL_PKEY_RSA_ENC;
2583     } else if ((alg_a & SSL_aECDSA) &&
2584                (c->pkeys[SSL_PKEY_ECC].privatekey != NULL))
2585         idx = SSL_PKEY_ECC;
2586     if (idx == -1) {
2587         SSLerr(SSL_F_SSL_GET_SIGN_PKEY, ERR_R_INTERNAL_ERROR);
2588         return (NULL);
2589     }
2590     if (pmd)
2591         *pmd = c->pkeys[idx].digest;
2592     return c->pkeys[idx].privatekey;
2593 }
2594 
2595 #ifndef OPENSSL_NO_TLSEXT
2596 int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
2597                                    size_t *serverinfo_length)
2598 {
2599     CERT *c = NULL;
2600     int i = 0;
2601     *serverinfo_length = 0;
2602 
2603     c = s->cert;
2604     i = ssl_get_server_cert_index(s);
2605 
2606     if (i == -1)
2607         return 0;
2608     if (c->pkeys[i].serverinfo == NULL)
2609         return 0;
2610 
2611     *serverinfo = c->pkeys[i].serverinfo;
2612     *serverinfo_length = c->pkeys[i].serverinfo_length;
2613     return 1;
2614 }
2615 #endif
2616 
2617 void ssl_update_cache(SSL *s, int mode)
2618 {
2619     int i;
2620 
2621     /*
2622      * If the session_id_length is 0, we are not supposed to cache it, and it
2623      * would be rather hard to do anyway :-)
2624      */
2625     if (s->session->session_id_length == 0)
2626         return;
2627 
2628     i = s->session_ctx->session_cache_mode;
2629     if ((i & mode) && (!s->hit)
2630         && ((i & SSL_SESS_CACHE_NO_INTERNAL_STORE)
2631             || SSL_CTX_add_session(s->session_ctx, s->session))
2632         && (s->session_ctx->new_session_cb != NULL)) {
2633         CRYPTO_add(&s->session->references, 1, CRYPTO_LOCK_SSL_SESSION);
2634         if (!s->session_ctx->new_session_cb(s, s->session))
2635             SSL_SESSION_free(s->session);
2636     }
2637 
2638     /* auto flush every 255 connections */
2639     if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) && ((i & mode) == mode)) {
2640         if ((((mode & SSL_SESS_CACHE_CLIENT)
2641               ? s->session_ctx->stats.sess_connect_good
2642               : s->session_ctx->stats.sess_accept_good) & 0xff) == 0xff) {
2643             SSL_CTX_flush_sessions(s->session_ctx, (unsigned long)time(NULL));
2644         }
2645     }
2646 }
2647 
2648 const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx)
2649 {
2650     return ctx->method;
2651 }
2652 
2653 const SSL_METHOD *SSL_get_ssl_method(SSL *s)
2654 {
2655     return (s->method);
2656 }
2657 
2658 int SSL_set_ssl_method(SSL *s, const SSL_METHOD *meth)
2659 {
2660     int conn = -1;
2661     int ret = 1;
2662 
2663     if (s->method != meth) {
2664         if (s->handshake_func != NULL)
2665             conn = (s->handshake_func == s->method->ssl_connect);
2666 
2667         if (s->method->version == meth->version)
2668             s->method = meth;
2669         else {
2670             s->method->ssl_free(s);
2671             s->method = meth;
2672             ret = s->method->ssl_new(s);
2673         }
2674 
2675         if (conn == 1)
2676             s->handshake_func = meth->ssl_connect;
2677         else if (conn == 0)
2678             s->handshake_func = meth->ssl_accept;
2679     }
2680     return (ret);
2681 }
2682 
2683 int SSL_get_error(const SSL *s, int i)
2684 {
2685     int reason;
2686     unsigned long l;
2687     BIO *bio;
2688 
2689     if (i > 0)
2690         return (SSL_ERROR_NONE);
2691 
2692     /*
2693      * Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake etc,
2694      * where we do encode the error
2695      */
2696     if ((l = ERR_peek_error()) != 0) {
2697         if (ERR_GET_LIB(l) == ERR_LIB_SYS)
2698             return (SSL_ERROR_SYSCALL);
2699         else
2700             return (SSL_ERROR_SSL);
2701     }
2702 
2703     if ((i < 0) && SSL_want_read(s)) {
2704         bio = SSL_get_rbio(s);
2705         if (BIO_should_read(bio))
2706             return (SSL_ERROR_WANT_READ);
2707         else if (BIO_should_write(bio))
2708             /*
2709              * This one doesn't make too much sense ... We never try to write
2710              * to the rbio, and an application program where rbio and wbio
2711              * are separate couldn't even know what it should wait for.
2712              * However if we ever set s->rwstate incorrectly (so that we have
2713              * SSL_want_read(s) instead of SSL_want_write(s)) and rbio and
2714              * wbio *are* the same, this test works around that bug; so it
2715              * might be safer to keep it.
2716              */
2717             return (SSL_ERROR_WANT_WRITE);
2718         else if (BIO_should_io_special(bio)) {
2719             reason = BIO_get_retry_reason(bio);
2720             if (reason == BIO_RR_CONNECT)
2721                 return (SSL_ERROR_WANT_CONNECT);
2722             else if (reason == BIO_RR_ACCEPT)
2723                 return (SSL_ERROR_WANT_ACCEPT);
2724             else
2725                 return (SSL_ERROR_SYSCALL); /* unknown */
2726         }
2727     }
2728 
2729     if ((i < 0) && SSL_want_write(s)) {
2730         bio = SSL_get_wbio(s);
2731         if (BIO_should_write(bio))
2732             return (SSL_ERROR_WANT_WRITE);
2733         else if (BIO_should_read(bio))
2734             /*
2735              * See above (SSL_want_read(s) with BIO_should_write(bio))
2736              */
2737             return (SSL_ERROR_WANT_READ);
2738         else if (BIO_should_io_special(bio)) {
2739             reason = BIO_get_retry_reason(bio);
2740             if (reason == BIO_RR_CONNECT)
2741                 return (SSL_ERROR_WANT_CONNECT);
2742             else if (reason == BIO_RR_ACCEPT)
2743                 return (SSL_ERROR_WANT_ACCEPT);
2744             else
2745                 return (SSL_ERROR_SYSCALL);
2746         }
2747     }
2748     if ((i < 0) && SSL_want_x509_lookup(s)) {
2749         return (SSL_ERROR_WANT_X509_LOOKUP);
2750     }
2751 
2752     if (i == 0) {
2753         if (s->version == SSL2_VERSION) {
2754             /* assume it is the socket being closed */
2755             return (SSL_ERROR_ZERO_RETURN);
2756         } else {
2757             if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
2758                 (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
2759                 return (SSL_ERROR_ZERO_RETURN);
2760         }
2761     }
2762     return (SSL_ERROR_SYSCALL);
2763 }
2764 
2765 int SSL_do_handshake(SSL *s)
2766 {
2767     int ret = 1;
2768 
2769     if (s->handshake_func == NULL) {
2770         SSLerr(SSL_F_SSL_DO_HANDSHAKE, SSL_R_CONNECTION_TYPE_NOT_SET);
2771         return (-1);
2772     }
2773 
2774     s->method->ssl_renegotiate_check(s);
2775 
2776     if (SSL_in_init(s) || SSL_in_before(s)) {
2777         ret = s->handshake_func(s);
2778     }
2779     return (ret);
2780 }
2781 
2782 /*
2783  * For the next 2 functions, SSL_clear() sets shutdown and so one of these
2784  * calls will reset it
2785  */
2786 void SSL_set_accept_state(SSL *s)
2787 {
2788     s->server = 1;
2789     s->shutdown = 0;
2790     s->state = SSL_ST_ACCEPT | SSL_ST_BEFORE;
2791     s->handshake_func = s->method->ssl_accept;
2792     /* clear the current cipher */
2793     ssl_clear_cipher_ctx(s);
2794     ssl_clear_hash_ctx(&s->read_hash);
2795     ssl_clear_hash_ctx(&s->write_hash);
2796 }
2797 
2798 void SSL_set_connect_state(SSL *s)
2799 {
2800     s->server = 0;
2801     s->shutdown = 0;
2802     s->state = SSL_ST_CONNECT | SSL_ST_BEFORE;
2803     s->handshake_func = s->method->ssl_connect;
2804     /* clear the current cipher */
2805     ssl_clear_cipher_ctx(s);
2806     ssl_clear_hash_ctx(&s->read_hash);
2807     ssl_clear_hash_ctx(&s->write_hash);
2808 }
2809 
2810 int ssl_undefined_function(SSL *s)
2811 {
2812     SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2813     return (0);
2814 }
2815 
2816 int ssl_undefined_void_function(void)
2817 {
2818     SSLerr(SSL_F_SSL_UNDEFINED_VOID_FUNCTION,
2819            ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2820     return (0);
2821 }
2822 
2823 int ssl_undefined_const_function(const SSL *s)
2824 {
2825     SSLerr(SSL_F_SSL_UNDEFINED_CONST_FUNCTION,
2826            ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2827     return (0);
2828 }
2829 
2830 SSL_METHOD *ssl_bad_method(int ver)
2831 {
2832     SSLerr(SSL_F_SSL_BAD_METHOD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2833     return (NULL);
2834 }
2835 
2836 const char *SSL_get_version(const SSL *s)
2837 {
2838     if (s->version == TLS1_2_VERSION)
2839         return ("TLSv1.2");
2840     else if (s->version == TLS1_1_VERSION)
2841         return ("TLSv1.1");
2842     else if (s->version == TLS1_VERSION)
2843         return ("TLSv1");
2844     else if (s->version == SSL3_VERSION)
2845         return ("SSLv3");
2846     else if (s->version == SSL2_VERSION)
2847         return ("SSLv2");
2848     else if (s->version == DTLS1_BAD_VER)
2849         return ("DTLSv0.9");
2850     else if (s->version == DTLS1_VERSION)
2851         return ("DTLSv1");
2852     else if (s->version == DTLS1_2_VERSION)
2853         return ("DTLSv1.2");
2854     else
2855         return ("unknown");
2856 }
2857 
2858 SSL *SSL_dup(SSL *s)
2859 {
2860     STACK_OF(X509_NAME) *sk;
2861     X509_NAME *xn;
2862     SSL *ret;
2863     int i;
2864 
2865     if ((ret = SSL_new(SSL_get_SSL_CTX(s))) == NULL)
2866         return (NULL);
2867 
2868     ret->version = s->version;
2869     ret->type = s->type;
2870     ret->method = s->method;
2871 
2872     if (s->session != NULL) {
2873         /* This copies session-id, SSL_METHOD, sid_ctx, and 'cert' */
2874         SSL_copy_session_id(ret, s);
2875     } else {
2876         /*
2877          * No session has been established yet, so we have to expect that
2878          * s->cert or ret->cert will be changed later -- they should not both
2879          * point to the same object, and thus we can't use
2880          * SSL_copy_session_id.
2881          */
2882 
2883         ret->method->ssl_free(ret);
2884         ret->method = s->method;
2885         ret->method->ssl_new(ret);
2886 
2887         if (s->cert != NULL) {
2888             if (ret->cert != NULL) {
2889                 ssl_cert_free(ret->cert);
2890             }
2891             ret->cert = ssl_cert_dup(s->cert);
2892             if (ret->cert == NULL)
2893                 goto err;
2894         }
2895 
2896         SSL_set_session_id_context(ret, s->sid_ctx, s->sid_ctx_length);
2897     }
2898 
2899     ret->options = s->options;
2900     ret->mode = s->mode;
2901     SSL_set_max_cert_list(ret, SSL_get_max_cert_list(s));
2902     SSL_set_read_ahead(ret, SSL_get_read_ahead(s));
2903     ret->msg_callback = s->msg_callback;
2904     ret->msg_callback_arg = s->msg_callback_arg;
2905     SSL_set_verify(ret, SSL_get_verify_mode(s), SSL_get_verify_callback(s));
2906     SSL_set_verify_depth(ret, SSL_get_verify_depth(s));
2907     ret->generate_session_id = s->generate_session_id;
2908 
2909     SSL_set_info_callback(ret, SSL_get_info_callback(s));
2910 
2911     ret->debug = s->debug;
2912 
2913     /* copy app data, a little dangerous perhaps */
2914     if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL, &ret->ex_data, &s->ex_data))
2915         goto err;
2916 
2917     /* setup rbio, and wbio */
2918     if (s->rbio != NULL) {
2919         if (!BIO_dup_state(s->rbio, (char *)&ret->rbio))
2920             goto err;
2921     }
2922     if (s->wbio != NULL) {
2923         if (s->wbio != s->rbio) {
2924             if (!BIO_dup_state(s->wbio, (char *)&ret->wbio))
2925                 goto err;
2926         } else
2927             ret->wbio = ret->rbio;
2928     }
2929     ret->rwstate = s->rwstate;
2930     ret->in_handshake = s->in_handshake;
2931     ret->handshake_func = s->handshake_func;
2932     ret->server = s->server;
2933     ret->renegotiate = s->renegotiate;
2934     ret->new_session = s->new_session;
2935     ret->quiet_shutdown = s->quiet_shutdown;
2936     ret->shutdown = s->shutdown;
2937     ret->state = s->state;      /* SSL_dup does not really work at any state,
2938                                  * though */
2939     ret->rstate = s->rstate;
2940     ret->init_num = 0;          /* would have to copy ret->init_buf,
2941                                  * ret->init_msg, ret->init_num,
2942                                  * ret->init_off */
2943     ret->hit = s->hit;
2944 
2945     X509_VERIFY_PARAM_inherit(ret->param, s->param);
2946 
2947     /* dup the cipher_list and cipher_list_by_id stacks */
2948     if (s->cipher_list != NULL) {
2949         if ((ret->cipher_list = sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
2950             goto err;
2951     }
2952     if (s->cipher_list_by_id != NULL)
2953         if ((ret->cipher_list_by_id = sk_SSL_CIPHER_dup(s->cipher_list_by_id))
2954             == NULL)
2955             goto err;
2956 
2957     /* Dup the client_CA list */
2958     if (s->client_CA != NULL) {
2959         if ((sk = sk_X509_NAME_dup(s->client_CA)) == NULL)
2960             goto err;
2961         ret->client_CA = sk;
2962         for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2963             xn = sk_X509_NAME_value(sk, i);
2964             if (sk_X509_NAME_set(sk, i, X509_NAME_dup(xn)) == NULL) {
2965                 X509_NAME_free(xn);
2966                 goto err;
2967             }
2968         }
2969     }
2970 
2971     if (0) {
2972  err:
2973         if (ret != NULL)
2974             SSL_free(ret);
2975         ret = NULL;
2976     }
2977     return (ret);
2978 }
2979 
2980 void ssl_clear_cipher_ctx(SSL *s)
2981 {
2982     if (s->enc_read_ctx != NULL) {
2983         EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
2984         OPENSSL_free(s->enc_read_ctx);
2985         s->enc_read_ctx = NULL;
2986     }
2987     if (s->enc_write_ctx != NULL) {
2988         EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
2989         OPENSSL_free(s->enc_write_ctx);
2990         s->enc_write_ctx = NULL;
2991     }
2992 #ifndef OPENSSL_NO_COMP
2993     if (s->expand != NULL) {
2994         COMP_CTX_free(s->expand);
2995         s->expand = NULL;
2996     }
2997     if (s->compress != NULL) {
2998         COMP_CTX_free(s->compress);
2999         s->compress = NULL;
3000     }
3001 #endif
3002 }
3003 
3004 X509 *SSL_get_certificate(const SSL *s)
3005 {
3006     if (s->cert != NULL)
3007         return (s->cert->key->x509);
3008     else
3009         return (NULL);
3010 }
3011 
3012 EVP_PKEY *SSL_get_privatekey(const SSL *s)
3013 {
3014     if (s->cert != NULL)
3015         return (s->cert->key->privatekey);
3016     else
3017         return (NULL);
3018 }
3019 
3020 X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx)
3021 {
3022     if (ctx->cert != NULL)
3023         return ctx->cert->key->x509;
3024     else
3025         return NULL;
3026 }
3027 
3028 EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx)
3029 {
3030     if (ctx->cert != NULL)
3031         return ctx->cert->key->privatekey;
3032     else
3033         return NULL;
3034 }
3035 
3036 const SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
3037 {
3038     if ((s->session != NULL) && (s->session->cipher != NULL))
3039         return (s->session->cipher);
3040     return (NULL);
3041 }
3042 
3043 #ifdef OPENSSL_NO_COMP
3044 const void *SSL_get_current_compression(SSL *s)
3045 {
3046     return NULL;
3047 }
3048 
3049 const void *SSL_get_current_expansion(SSL *s)
3050 {
3051     return NULL;
3052 }
3053 #else
3054 
3055 const COMP_METHOD *SSL_get_current_compression(SSL *s)
3056 {
3057     if (s->compress != NULL)
3058         return (s->compress->meth);
3059     return (NULL);
3060 }
3061 
3062 const COMP_METHOD *SSL_get_current_expansion(SSL *s)
3063 {
3064     if (s->expand != NULL)
3065         return (s->expand->meth);
3066     return (NULL);
3067 }
3068 #endif
3069 
3070 int ssl_init_wbio_buffer(SSL *s, int push)
3071 {
3072     BIO *bbio;
3073 
3074     if (s->bbio == NULL) {
3075         bbio = BIO_new(BIO_f_buffer());
3076         if (bbio == NULL)
3077             return (0);
3078         s->bbio = bbio;
3079     } else {
3080         bbio = s->bbio;
3081         if (s->bbio == s->wbio)
3082             s->wbio = BIO_pop(s->wbio);
3083     }
3084     (void)BIO_reset(bbio);
3085 /*      if (!BIO_set_write_buffer_size(bbio,16*1024)) */
3086     if (!BIO_set_read_buffer_size(bbio, 1)) {
3087         SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER, ERR_R_BUF_LIB);
3088         return (0);
3089     }
3090     if (push) {
3091         if (s->wbio != bbio)
3092             s->wbio = BIO_push(bbio, s->wbio);
3093     } else {
3094         if (s->wbio == bbio)
3095             s->wbio = BIO_pop(bbio);
3096     }
3097     return (1);
3098 }
3099 
3100 void ssl_free_wbio_buffer(SSL *s)
3101 {
3102     if (s->bbio == NULL)
3103         return;
3104 
3105     if (s->bbio == s->wbio) {
3106         /* remove buffering */
3107         s->wbio = BIO_pop(s->wbio);
3108 #ifdef REF_CHECK                /* not the usual REF_CHECK, but this avoids
3109                                  * adding one more preprocessor symbol */
3110         assert(s->wbio != NULL);
3111 #endif
3112     }
3113     BIO_free(s->bbio);
3114     s->bbio = NULL;
3115 }
3116 
3117 void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode)
3118 {
3119     ctx->quiet_shutdown = mode;
3120 }
3121 
3122 int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx)
3123 {
3124     return (ctx->quiet_shutdown);
3125 }
3126 
3127 void SSL_set_quiet_shutdown(SSL *s, int mode)
3128 {
3129     s->quiet_shutdown = mode;
3130 }
3131 
3132 int SSL_get_quiet_shutdown(const SSL *s)
3133 {
3134     return (s->quiet_shutdown);
3135 }
3136 
3137 void SSL_set_shutdown(SSL *s, int mode)
3138 {
3139     s->shutdown = mode;
3140 }
3141 
3142 int SSL_get_shutdown(const SSL *s)
3143 {
3144     return (s->shutdown);
3145 }
3146 
3147 int SSL_version(const SSL *s)
3148 {
3149     return (s->version);
3150 }
3151 
3152 SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
3153 {
3154     return (ssl->ctx);
3155 }
3156 
3157 SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx)
3158 {
3159     CERT *ocert = ssl->cert;
3160     if (ssl->ctx == ctx)
3161         return ssl->ctx;
3162 #ifndef OPENSSL_NO_TLSEXT
3163     if (ctx == NULL)
3164         ctx = ssl->initial_ctx;
3165 #endif
3166     ssl->cert = ssl_cert_dup(ctx->cert);
3167     if (ocert) {
3168         /* Preserve any already negotiated parameters */
3169         if (ssl->server) {
3170             ssl->cert->peer_sigalgs = ocert->peer_sigalgs;
3171             ssl->cert->peer_sigalgslen = ocert->peer_sigalgslen;
3172             ocert->peer_sigalgs = NULL;
3173             ssl->cert->ciphers_raw = ocert->ciphers_raw;
3174             ssl->cert->ciphers_rawlen = ocert->ciphers_rawlen;
3175             ocert->ciphers_raw = NULL;
3176         }
3177         ssl_cert_free(ocert);
3178     }
3179 
3180     /*
3181      * Program invariant: |sid_ctx| has fixed size (SSL_MAX_SID_CTX_LENGTH),
3182      * so setter APIs must prevent invalid lengths from entering the system.
3183      */
3184     OPENSSL_assert(ssl->sid_ctx_length <= sizeof(ssl->sid_ctx));
3185 
3186     /*
3187      * If the session ID context matches that of the parent SSL_CTX,
3188      * inherit it from the new SSL_CTX as well. If however the context does
3189      * not match (i.e., it was set per-ssl with SSL_set_session_id_context),
3190      * leave it unchanged.
3191      */
3192     if ((ssl->ctx != NULL) &&
3193         (ssl->sid_ctx_length == ssl->ctx->sid_ctx_length) &&
3194         (memcmp(ssl->sid_ctx, ssl->ctx->sid_ctx, ssl->sid_ctx_length) == 0)) {
3195         ssl->sid_ctx_length = ctx->sid_ctx_length;
3196         memcpy(&ssl->sid_ctx, &ctx->sid_ctx, sizeof(ssl->sid_ctx));
3197     }
3198 
3199     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
3200     if (ssl->ctx != NULL)
3201         SSL_CTX_free(ssl->ctx); /* decrement reference count */
3202     ssl->ctx = ctx;
3203 
3204     return (ssl->ctx);
3205 }
3206 
3207 #ifndef OPENSSL_NO_STDIO
3208 int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
3209 {
3210     return (X509_STORE_set_default_paths(ctx->cert_store));
3211 }
3212 
3213 int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
3214                                   const char *CApath)
3215 {
3216     return (X509_STORE_load_locations(ctx->cert_store, CAfile, CApath));
3217 }
3218 #endif
3219 
3220 void SSL_set_info_callback(SSL *ssl,
3221                            void (*cb) (const SSL *ssl, int type, int val))
3222 {
3223     ssl->info_callback = cb;
3224 }
3225 
3226 /*
3227  * One compiler (Diab DCC) doesn't like argument names in returned function
3228  * pointer.
3229  */
3230 void (*SSL_get_info_callback(const SSL *ssl)) (const SSL * /* ssl */ ,
3231                                                int /* type */ ,
3232                                                int /* val */ ) {
3233     return ssl->info_callback;
3234 }
3235 
3236 int SSL_state(const SSL *ssl)
3237 {
3238     return (ssl->state);
3239 }
3240 
3241 void SSL_set_state(SSL *ssl, int state)
3242 {
3243     ssl->state = state;
3244 }
3245 
3246 void SSL_set_verify_result(SSL *ssl, long arg)
3247 {
3248     ssl->verify_result = arg;
3249 }
3250 
3251 long SSL_get_verify_result(const SSL *ssl)
3252 {
3253     return (ssl->verify_result);
3254 }
3255 
3256 int SSL_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
3257                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
3258 {
3259     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL, argl, argp,
3260                                    new_func, dup_func, free_func);
3261 }
3262 
3263 int SSL_set_ex_data(SSL *s, int idx, void *arg)
3264 {
3265     return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
3266 }
3267 
3268 void *SSL_get_ex_data(const SSL *s, int idx)
3269 {
3270     return (CRYPTO_get_ex_data(&s->ex_data, idx));
3271 }
3272 
3273 int SSL_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
3274                              CRYPTO_EX_dup *dup_func,
3275                              CRYPTO_EX_free *free_func)
3276 {
3277     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_CTX, argl, argp,
3278                                    new_func, dup_func, free_func);
3279 }
3280 
3281 int SSL_CTX_set_ex_data(SSL_CTX *s, int idx, void *arg)
3282 {
3283     return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
3284 }
3285 
3286 void *SSL_CTX_get_ex_data(const SSL_CTX *s, int idx)
3287 {
3288     return (CRYPTO_get_ex_data(&s->ex_data, idx));
3289 }
3290 
3291 int ssl_ok(SSL *s)
3292 {
3293     return (1);
3294 }
3295 
3296 X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx)
3297 {
3298     return (ctx->cert_store);
3299 }
3300 
3301 void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store)
3302 {
3303     if (ctx->cert_store != NULL)
3304         X509_STORE_free(ctx->cert_store);
3305     ctx->cert_store = store;
3306 }
3307 
3308 int SSL_want(const SSL *s)
3309 {
3310     return (s->rwstate);
3311 }
3312 
3313 /**
3314  * \brief Set the callback for generating temporary RSA keys.
3315  * \param ctx the SSL context.
3316  * \param cb the callback
3317  */
3318 
3319 #ifndef OPENSSL_NO_RSA
3320 void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx, RSA *(*cb) (SSL *ssl,
3321                                                             int is_export,
3322                                                             int keylength))
3323 {
3324     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_RSA_CB, (void (*)(void))cb);
3325 }
3326 
3327 void SSL_set_tmp_rsa_callback(SSL *ssl, RSA *(*cb) (SSL *ssl,
3328                                                     int is_export,
3329                                                     int keylength))
3330 {
3331     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_RSA_CB, (void (*)(void))cb);
3332 }
3333 #endif
3334 
3335 #ifdef DOXYGEN
3336 /**
3337  * \brief The RSA temporary key callback function.
3338  * \param ssl the SSL session.
3339  * \param is_export \c TRUE if the temp RSA key is for an export ciphersuite.
3340  * \param keylength if \c is_export is \c TRUE, then \c keylength is the size
3341  * of the required key in bits.
3342  * \return the temporary RSA key.
3343  * \sa SSL_CTX_set_tmp_rsa_callback, SSL_set_tmp_rsa_callback
3344  */
3345 
3346 RSA *cb(SSL *ssl, int is_export, int keylength)
3347 {
3348 }
3349 #endif
3350 
3351 /**
3352  * \brief Set the callback for generating temporary DH keys.
3353  * \param ctx the SSL context.
3354  * \param dh the callback
3355  */
3356 
3357 #ifndef OPENSSL_NO_DH
3358 void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,
3359                                  DH *(*dh) (SSL *ssl, int is_export,
3360                                             int keylength))
3361 {
3362     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
3363 }
3364 
3365 void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,
3366                                                   int keylength))
3367 {
3368     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
3369 }
3370 #endif
3371 
3372 #ifndef OPENSSL_NO_ECDH
3373 void SSL_CTX_set_tmp_ecdh_callback(SSL_CTX *ctx,
3374                                    EC_KEY *(*ecdh) (SSL *ssl, int is_export,
3375                                                     int keylength))
3376 {
3377     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_ECDH_CB,
3378                           (void (*)(void))ecdh);
3379 }
3380 
3381 void SSL_set_tmp_ecdh_callback(SSL *ssl,
3382                                EC_KEY *(*ecdh) (SSL *ssl, int is_export,
3383                                                 int keylength))
3384 {
3385     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_ECDH_CB, (void (*)(void))ecdh);
3386 }
3387 #endif
3388 
3389 #ifndef OPENSSL_NO_PSK
3390 int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
3391 {
3392     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
3393         SSLerr(SSL_F_SSL_CTX_USE_PSK_IDENTITY_HINT,
3394                SSL_R_DATA_LENGTH_TOO_LONG);
3395         return 0;
3396     }
3397     if (ctx->psk_identity_hint != NULL)
3398         OPENSSL_free(ctx->psk_identity_hint);
3399     if (identity_hint != NULL) {
3400         ctx->psk_identity_hint = BUF_strdup(identity_hint);
3401         if (ctx->psk_identity_hint == NULL)
3402             return 0;
3403     } else
3404         ctx->psk_identity_hint = NULL;
3405     return 1;
3406 }
3407 
3408 int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint)
3409 {
3410     if (s == NULL)
3411         return 0;
3412 
3413     if (s->session == NULL)
3414         return 1;               /* session not created yet, ignored */
3415 
3416     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
3417         SSLerr(SSL_F_SSL_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
3418         return 0;
3419     }
3420     if (s->session->psk_identity_hint != NULL)
3421         OPENSSL_free(s->session->psk_identity_hint);
3422     if (identity_hint != NULL) {
3423         s->session->psk_identity_hint = BUF_strdup(identity_hint);
3424         if (s->session->psk_identity_hint == NULL)
3425             return 0;
3426     } else
3427         s->session->psk_identity_hint = NULL;
3428     return 1;
3429 }
3430 
3431 const char *SSL_get_psk_identity_hint(const SSL *s)
3432 {
3433     if (s == NULL || s->session == NULL)
3434         return NULL;
3435     return (s->session->psk_identity_hint);
3436 }
3437 
3438 const char *SSL_get_psk_identity(const SSL *s)
3439 {
3440     if (s == NULL || s->session == NULL)
3441         return NULL;
3442     return (s->session->psk_identity);
3443 }
3444 
3445 void SSL_set_psk_client_callback(SSL *s,
3446                                  unsigned int (*cb) (SSL *ssl,
3447                                                      const char *hint,
3448                                                      char *identity,
3449                                                      unsigned int
3450                                                      max_identity_len,
3451                                                      unsigned char *psk,
3452                                                      unsigned int
3453                                                      max_psk_len))
3454 {
3455     s->psk_client_callback = cb;
3456 }
3457 
3458 void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
3459                                      unsigned int (*cb) (SSL *ssl,
3460                                                          const char *hint,
3461                                                          char *identity,
3462                                                          unsigned int
3463                                                          max_identity_len,
3464                                                          unsigned char *psk,
3465                                                          unsigned int
3466                                                          max_psk_len))
3467 {
3468     ctx->psk_client_callback = cb;
3469 }
3470 
3471 void SSL_set_psk_server_callback(SSL *s,
3472                                  unsigned int (*cb) (SSL *ssl,
3473                                                      const char *identity,
3474                                                      unsigned char *psk,
3475                                                      unsigned int
3476                                                      max_psk_len))
3477 {
3478     s->psk_server_callback = cb;
3479 }
3480 
3481 void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx,
3482                                      unsigned int (*cb) (SSL *ssl,
3483                                                          const char *identity,
3484                                                          unsigned char *psk,
3485                                                          unsigned int
3486                                                          max_psk_len))
3487 {
3488     ctx->psk_server_callback = cb;
3489 }
3490 #endif
3491 
3492 void SSL_CTX_set_msg_callback(SSL_CTX *ctx,
3493                               void (*cb) (int write_p, int version,
3494                                           int content_type, const void *buf,
3495                                           size_t len, SSL *ssl, void *arg))
3496 {
3497     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
3498 }
3499 
3500 void SSL_set_msg_callback(SSL *ssl,
3501                           void (*cb) (int write_p, int version,
3502                                       int content_type, const void *buf,
3503                                       size_t len, SSL *ssl, void *arg))
3504 {
3505     SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
3506 }
3507 
3508 /*
3509  * Allocates new EVP_MD_CTX and sets pointer to it into given pointer
3510  * vairable, freeing EVP_MD_CTX previously stored in that variable, if any.
3511  * If EVP_MD pointer is passed, initializes ctx with this md Returns newly
3512  * allocated ctx;
3513  */
3514 
3515 EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md)
3516 {
3517     ssl_clear_hash_ctx(hash);
3518     *hash = EVP_MD_CTX_create();
3519     if (*hash == NULL || (md && EVP_DigestInit_ex(*hash, md, NULL) <= 0)) {
3520         EVP_MD_CTX_destroy(*hash);
3521         *hash = NULL;
3522         return NULL;
3523     }
3524     return *hash;
3525 }
3526 
3527 void ssl_clear_hash_ctx(EVP_MD_CTX **hash)
3528 {
3529 
3530     if (*hash)
3531         EVP_MD_CTX_destroy(*hash);
3532     *hash = NULL;
3533 }
3534 
3535 void SSL_set_debug(SSL *s, int debug)
3536 {
3537     s->debug = debug;
3538 }
3539 
3540 int SSL_cache_hit(SSL *s)
3541 {
3542     return s->hit;
3543 }
3544 
3545 int SSL_is_server(SSL *s)
3546 {
3547     return s->server;
3548 }
3549 
3550 #if defined(_WINDLL) && defined(OPENSSL_SYS_WIN16)
3551 # include "../crypto/bio/bss_file.c"
3552 #endif
3553 
3554 IMPLEMENT_STACK_OF(SSL_CIPHER)
3555 IMPLEMENT_STACK_OF(SSL_COMP)
3556 IMPLEMENT_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id);
3557