xref: /freebsd/crypto/openssl/ssl/ssl_lib.c (revision 792bbaba989533a1fc93823df1720c8c4aaf0442)
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 #ifndef OPENSSL_NO_TLSEXT
248     if (s->cert != NULL) {
249         if (s->cert->alpn_proposed) {
250             OPENSSL_free(s->cert->alpn_proposed);
251             s->cert->alpn_proposed = NULL;
252         }
253         s->cert->alpn_proposed_len = 0;
254         s->cert->alpn_sent = 0;
255     }
256 #endif
257 #if 1
258     /*
259      * Check to see if we were changed into a different method, if so, revert
260      * back if we are not doing session-id reuse.
261      */
262     if (!s->in_handshake && (s->session == NULL)
263         && (s->method != s->ctx->method)) {
264         s->method->ssl_free(s);
265         s->method = s->ctx->method;
266         if (!s->method->ssl_new(s))
267             return (0);
268     } else
269 #endif
270         s->method->ssl_clear(s);
271     return (1);
272 }
273 
274 /** Used to change an SSL_CTXs default SSL method type */
275 int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
276 {
277     STACK_OF(SSL_CIPHER) *sk;
278 
279     ctx->method = meth;
280 
281     sk = ssl_create_cipher_list(ctx->method, &(ctx->cipher_list),
282                                 &(ctx->cipher_list_by_id),
283                                 meth->version ==
284                                 SSL2_VERSION ? "SSLv2" :
285                                 SSL_DEFAULT_CIPHER_LIST, ctx->cert);
286     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0)) {
287         SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,
288                SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
289         return (0);
290     }
291     return (1);
292 }
293 
294 SSL *SSL_new(SSL_CTX *ctx)
295 {
296     SSL *s;
297 
298     if (ctx == NULL) {
299         SSLerr(SSL_F_SSL_NEW, SSL_R_NULL_SSL_CTX);
300         return (NULL);
301     }
302     if (ctx->method == NULL) {
303         SSLerr(SSL_F_SSL_NEW, SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
304         return (NULL);
305     }
306 
307     s = (SSL *)OPENSSL_malloc(sizeof(SSL));
308     if (s == NULL)
309         goto err;
310     memset(s, 0, sizeof(SSL));
311 
312 #ifndef OPENSSL_NO_KRB5
313     s->kssl_ctx = kssl_ctx_new();
314 #endif                          /* OPENSSL_NO_KRB5 */
315 
316     s->options = ctx->options;
317     s->mode = ctx->mode;
318     s->max_cert_list = ctx->max_cert_list;
319     s->references = 1;
320 
321     if (ctx->cert != NULL) {
322         /*
323          * Earlier library versions used to copy the pointer to the CERT, not
324          * its contents; only when setting new parameters for the per-SSL
325          * copy, ssl_cert_new would be called (and the direct reference to
326          * the per-SSL_CTX settings would be lost, but those still were
327          * indirectly accessed for various purposes, and for that reason they
328          * used to be known as s->ctx->default_cert). Now we don't look at the
329          * SSL_CTX's CERT after having duplicated it once.
330          */
331 
332         s->cert = ssl_cert_dup(ctx->cert);
333         if (s->cert == NULL)
334             goto err;
335     } else
336         s->cert = NULL;         /* Cannot really happen (see SSL_CTX_new) */
337 
338     s->read_ahead = ctx->read_ahead;
339     s->msg_callback = ctx->msg_callback;
340     s->msg_callback_arg = ctx->msg_callback_arg;
341     s->verify_mode = ctx->verify_mode;
342 #if 0
343     s->verify_depth = ctx->verify_depth;
344 #endif
345     s->sid_ctx_length = ctx->sid_ctx_length;
346     OPENSSL_assert(s->sid_ctx_length <= sizeof s->sid_ctx);
347     memcpy(&s->sid_ctx, &ctx->sid_ctx, sizeof(s->sid_ctx));
348     s->verify_callback = ctx->default_verify_callback;
349     s->generate_session_id = ctx->generate_session_id;
350 
351     s->param = X509_VERIFY_PARAM_new();
352     if (!s->param)
353         goto err;
354     X509_VERIFY_PARAM_inherit(s->param, ctx->param);
355 #if 0
356     s->purpose = ctx->purpose;
357     s->trust = ctx->trust;
358 #endif
359     s->quiet_shutdown = ctx->quiet_shutdown;
360     s->max_send_fragment = ctx->max_send_fragment;
361 
362     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
363     s->ctx = ctx;
364 #ifndef OPENSSL_NO_TLSEXT
365     s->tlsext_debug_cb = 0;
366     s->tlsext_debug_arg = NULL;
367     s->tlsext_ticket_expected = 0;
368     s->tlsext_status_type = -1;
369     s->tlsext_status_expected = 0;
370     s->tlsext_ocsp_ids = NULL;
371     s->tlsext_ocsp_exts = NULL;
372     s->tlsext_ocsp_resp = NULL;
373     s->tlsext_ocsp_resplen = -1;
374     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
375     s->initial_ctx = ctx;
376 # ifndef OPENSSL_NO_EC
377     if (ctx->tlsext_ecpointformatlist) {
378         s->tlsext_ecpointformatlist =
379             BUF_memdup(ctx->tlsext_ecpointformatlist,
380                        ctx->tlsext_ecpointformatlist_length);
381         if (!s->tlsext_ecpointformatlist)
382             goto err;
383         s->tlsext_ecpointformatlist_length =
384             ctx->tlsext_ecpointformatlist_length;
385     }
386     if (ctx->tlsext_ellipticcurvelist) {
387         s->tlsext_ellipticcurvelist =
388             BUF_memdup(ctx->tlsext_ellipticcurvelist,
389                        ctx->tlsext_ellipticcurvelist_length);
390         if (!s->tlsext_ellipticcurvelist)
391             goto err;
392         s->tlsext_ellipticcurvelist_length =
393             ctx->tlsext_ellipticcurvelist_length;
394     }
395 # endif
396 # ifndef OPENSSL_NO_NEXTPROTONEG
397     s->next_proto_negotiated = NULL;
398 # endif
399 
400     if (s->ctx->alpn_client_proto_list) {
401         s->alpn_client_proto_list =
402             OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
403         if (s->alpn_client_proto_list == NULL)
404             goto err;
405         memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
406                s->ctx->alpn_client_proto_list_len);
407         s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
408     }
409 #endif
410 
411     s->verify_result = X509_V_OK;
412 
413     s->method = ctx->method;
414 
415     if (!s->method->ssl_new(s))
416         goto err;
417 
418     s->server = (ctx->method->ssl_accept == ssl_undefined_function) ? 0 : 1;
419 
420     SSL_clear(s);
421 
422     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
423 
424 #ifndef OPENSSL_NO_PSK
425     s->psk_client_callback = ctx->psk_client_callback;
426     s->psk_server_callback = ctx->psk_server_callback;
427 #endif
428 
429     return (s);
430  err:
431     if (s != NULL)
432         SSL_free(s);
433     SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
434     return (NULL);
435 }
436 
437 int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
438                                    unsigned int sid_ctx_len)
439 {
440     if (sid_ctx_len > sizeof ctx->sid_ctx) {
441         SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,
442                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
443         return 0;
444     }
445     ctx->sid_ctx_length = sid_ctx_len;
446     memcpy(ctx->sid_ctx, sid_ctx, sid_ctx_len);
447 
448     return 1;
449 }
450 
451 int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
452                                unsigned int sid_ctx_len)
453 {
454     if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
455         SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,
456                SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
457         return 0;
458     }
459     ssl->sid_ctx_length = sid_ctx_len;
460     memcpy(ssl->sid_ctx, sid_ctx, sid_ctx_len);
461 
462     return 1;
463 }
464 
465 int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
466 {
467     CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
468     ctx->generate_session_id = cb;
469     CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
470     return 1;
471 }
472 
473 int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
474 {
475     CRYPTO_w_lock(CRYPTO_LOCK_SSL);
476     ssl->generate_session_id = cb;
477     CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
478     return 1;
479 }
480 
481 int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
482                                 unsigned int id_len)
483 {
484     /*
485      * A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
486      * we can "construct" a session to give us the desired check - ie. to
487      * find if there's a session in the hash table that would conflict with
488      * any new session built out of this id/id_len and the ssl_version in use
489      * by this SSL.
490      */
491     SSL_SESSION r, *p;
492 
493     if (id_len > sizeof r.session_id)
494         return 0;
495 
496     r.ssl_version = ssl->version;
497     r.session_id_length = id_len;
498     memcpy(r.session_id, id, id_len);
499     /*
500      * NB: SSLv2 always uses a fixed 16-byte session ID, so even if a
501      * callback is calling us to check the uniqueness of a shorter ID, it
502      * must be compared as a padded-out ID because that is what it will be
503      * converted to when the callback has finished choosing it.
504      */
505     if ((r.ssl_version == SSL2_VERSION) &&
506         (id_len < SSL2_SSL_SESSION_ID_LENGTH)) {
507         memset(r.session_id + id_len, 0, SSL2_SSL_SESSION_ID_LENGTH - id_len);
508         r.session_id_length = SSL2_SSL_SESSION_ID_LENGTH;
509     }
510 
511     CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
512     p = lh_SSL_SESSION_retrieve(ssl->ctx->sessions, &r);
513     CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
514     return (p != NULL);
515 }
516 
517 int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
518 {
519     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
520 }
521 
522 int SSL_set_purpose(SSL *s, int purpose)
523 {
524     return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
525 }
526 
527 int SSL_CTX_set_trust(SSL_CTX *s, int trust)
528 {
529     return X509_VERIFY_PARAM_set_trust(s->param, trust);
530 }
531 
532 int SSL_set_trust(SSL *s, int trust)
533 {
534     return X509_VERIFY_PARAM_set_trust(s->param, trust);
535 }
536 
537 int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
538 {
539     return X509_VERIFY_PARAM_set1(ctx->param, vpm);
540 }
541 
542 int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
543 {
544     return X509_VERIFY_PARAM_set1(ssl->param, vpm);
545 }
546 
547 X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
548 {
549     return ctx->param;
550 }
551 
552 X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
553 {
554     return ssl->param;
555 }
556 
557 void SSL_certs_clear(SSL *s)
558 {
559     ssl_cert_clear_certs(s->cert);
560 }
561 
562 void SSL_free(SSL *s)
563 {
564     int i;
565 
566     if (s == NULL)
567         return;
568 
569     i = CRYPTO_add(&s->references, -1, CRYPTO_LOCK_SSL);
570 #ifdef REF_PRINT
571     REF_PRINT("SSL", s);
572 #endif
573     if (i > 0)
574         return;
575 #ifdef REF_CHECK
576     if (i < 0) {
577         fprintf(stderr, "SSL_free, bad reference count\n");
578         abort();                /* ok */
579     }
580 #endif
581 
582     if (s->param)
583         X509_VERIFY_PARAM_free(s->param);
584 
585     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
586 
587     if (s->bbio != NULL) {
588         /* If the buffering BIO is in place, pop it off */
589         if (s->bbio == s->wbio) {
590             s->wbio = BIO_pop(s->wbio);
591         }
592         BIO_free(s->bbio);
593         s->bbio = NULL;
594     }
595     if (s->rbio != NULL)
596         BIO_free_all(s->rbio);
597     if ((s->wbio != NULL) && (s->wbio != s->rbio))
598         BIO_free_all(s->wbio);
599 
600     if (s->init_buf != NULL)
601         BUF_MEM_free(s->init_buf);
602 
603     /* add extra stuff */
604     if (s->cipher_list != NULL)
605         sk_SSL_CIPHER_free(s->cipher_list);
606     if (s->cipher_list_by_id != NULL)
607         sk_SSL_CIPHER_free(s->cipher_list_by_id);
608 
609     /* Make the next call work :-) */
610     if (s->session != NULL) {
611         ssl_clear_bad_session(s);
612         SSL_SESSION_free(s->session);
613     }
614 
615     ssl_clear_cipher_ctx(s);
616     ssl_clear_hash_ctx(&s->read_hash);
617     ssl_clear_hash_ctx(&s->write_hash);
618 
619     if (s->cert != NULL)
620         ssl_cert_free(s->cert);
621     /* Free up if allocated */
622 
623 #ifndef OPENSSL_NO_TLSEXT
624     if (s->tlsext_hostname)
625         OPENSSL_free(s->tlsext_hostname);
626     if (s->initial_ctx)
627         SSL_CTX_free(s->initial_ctx);
628 # ifndef OPENSSL_NO_EC
629     if (s->tlsext_ecpointformatlist)
630         OPENSSL_free(s->tlsext_ecpointformatlist);
631     if (s->tlsext_ellipticcurvelist)
632         OPENSSL_free(s->tlsext_ellipticcurvelist);
633 # endif                         /* OPENSSL_NO_EC */
634     if (s->tlsext_opaque_prf_input)
635         OPENSSL_free(s->tlsext_opaque_prf_input);
636     if (s->tlsext_ocsp_exts)
637         sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, X509_EXTENSION_free);
638     if (s->tlsext_ocsp_ids)
639         sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
640     if (s->tlsext_ocsp_resp)
641         OPENSSL_free(s->tlsext_ocsp_resp);
642     if (s->alpn_client_proto_list)
643         OPENSSL_free(s->alpn_client_proto_list);
644 #endif
645 
646     if (s->client_CA != NULL)
647         sk_X509_NAME_pop_free(s->client_CA, X509_NAME_free);
648 
649     if (s->method != NULL)
650         s->method->ssl_free(s);
651 
652     if (s->ctx)
653         SSL_CTX_free(s->ctx);
654 
655 #ifndef OPENSSL_NO_KRB5
656     if (s->kssl_ctx != NULL)
657         kssl_ctx_free(s->kssl_ctx);
658 #endif                          /* OPENSSL_NO_KRB5 */
659 
660 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
661     if (s->next_proto_negotiated)
662         OPENSSL_free(s->next_proto_negotiated);
663 #endif
664 
665 #ifndef OPENSSL_NO_SRTP
666     if (s->srtp_profiles)
667         sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);
668 #endif
669 
670     OPENSSL_free(s);
671 }
672 
673 void SSL_set_bio(SSL *s, BIO *rbio, BIO *wbio)
674 {
675     /*
676      * If the output buffering BIO is still in place, remove it
677      */
678     if (s->bbio != NULL) {
679         if (s->wbio == s->bbio) {
680             s->wbio = s->wbio->next_bio;
681             s->bbio->next_bio = NULL;
682         }
683     }
684     if ((s->rbio != NULL) && (s->rbio != rbio))
685         BIO_free_all(s->rbio);
686     if ((s->wbio != NULL) && (s->wbio != wbio) && (s->rbio != s->wbio))
687         BIO_free_all(s->wbio);
688     s->rbio = rbio;
689     s->wbio = wbio;
690 }
691 
692 BIO *SSL_get_rbio(const SSL *s)
693 {
694     return (s->rbio);
695 }
696 
697 BIO *SSL_get_wbio(const SSL *s)
698 {
699     return (s->wbio);
700 }
701 
702 int SSL_get_fd(const SSL *s)
703 {
704     return (SSL_get_rfd(s));
705 }
706 
707 int SSL_get_rfd(const SSL *s)
708 {
709     int ret = -1;
710     BIO *b, *r;
711 
712     b = SSL_get_rbio(s);
713     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
714     if (r != NULL)
715         BIO_get_fd(r, &ret);
716     return (ret);
717 }
718 
719 int SSL_get_wfd(const SSL *s)
720 {
721     int ret = -1;
722     BIO *b, *r;
723 
724     b = SSL_get_wbio(s);
725     r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
726     if (r != NULL)
727         BIO_get_fd(r, &ret);
728     return (ret);
729 }
730 
731 #ifndef OPENSSL_NO_SOCK
732 int SSL_set_fd(SSL *s, int fd)
733 {
734     int ret = 0;
735     BIO *bio = NULL;
736 
737     bio = BIO_new(BIO_s_socket());
738 
739     if (bio == NULL) {
740         SSLerr(SSL_F_SSL_SET_FD, ERR_R_BUF_LIB);
741         goto err;
742     }
743     BIO_set_fd(bio, fd, BIO_NOCLOSE);
744     SSL_set_bio(s, bio, bio);
745     ret = 1;
746  err:
747     return (ret);
748 }
749 
750 int SSL_set_wfd(SSL *s, int fd)
751 {
752     int ret = 0;
753     BIO *bio = NULL;
754 
755     if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
756         || ((int)BIO_get_fd(s->rbio, NULL) != fd)) {
757         bio = BIO_new(BIO_s_socket());
758 
759         if (bio == NULL) {
760             SSLerr(SSL_F_SSL_SET_WFD, ERR_R_BUF_LIB);
761             goto err;
762         }
763         BIO_set_fd(bio, fd, BIO_NOCLOSE);
764         SSL_set_bio(s, SSL_get_rbio(s), bio);
765     } else
766         SSL_set_bio(s, SSL_get_rbio(s), SSL_get_rbio(s));
767     ret = 1;
768  err:
769     return (ret);
770 }
771 
772 int SSL_set_rfd(SSL *s, int fd)
773 {
774     int ret = 0;
775     BIO *bio = NULL;
776 
777     if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
778         || ((int)BIO_get_fd(s->wbio, NULL) != fd)) {
779         bio = BIO_new(BIO_s_socket());
780 
781         if (bio == NULL) {
782             SSLerr(SSL_F_SSL_SET_RFD, ERR_R_BUF_LIB);
783             goto err;
784         }
785         BIO_set_fd(bio, fd, BIO_NOCLOSE);
786         SSL_set_bio(s, bio, SSL_get_wbio(s));
787     } else
788         SSL_set_bio(s, SSL_get_wbio(s), SSL_get_wbio(s));
789     ret = 1;
790  err:
791     return (ret);
792 }
793 #endif
794 
795 /* return length of latest Finished message we sent, copy to 'buf' */
796 size_t SSL_get_finished(const SSL *s, void *buf, size_t count)
797 {
798     size_t ret = 0;
799 
800     if (s->s3 != NULL) {
801         ret = s->s3->tmp.finish_md_len;
802         if (count > ret)
803             count = ret;
804         memcpy(buf, s->s3->tmp.finish_md, count);
805     }
806     return ret;
807 }
808 
809 /* return length of latest Finished message we expected, copy to 'buf' */
810 size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count)
811 {
812     size_t ret = 0;
813 
814     if (s->s3 != NULL) {
815         ret = s->s3->tmp.peer_finish_md_len;
816         if (count > ret)
817             count = ret;
818         memcpy(buf, s->s3->tmp.peer_finish_md, count);
819     }
820     return ret;
821 }
822 
823 int SSL_get_verify_mode(const SSL *s)
824 {
825     return (s->verify_mode);
826 }
827 
828 int SSL_get_verify_depth(const SSL *s)
829 {
830     return X509_VERIFY_PARAM_get_depth(s->param);
831 }
832 
833 int (*SSL_get_verify_callback(const SSL *s)) (int, X509_STORE_CTX *) {
834     return (s->verify_callback);
835 }
836 
837 int SSL_CTX_get_verify_mode(const SSL_CTX *ctx)
838 {
839     return (ctx->verify_mode);
840 }
841 
842 int SSL_CTX_get_verify_depth(const SSL_CTX *ctx)
843 {
844     return X509_VERIFY_PARAM_get_depth(ctx->param);
845 }
846 
847 int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx)) (int, X509_STORE_CTX *) {
848     return (ctx->default_verify_callback);
849 }
850 
851 void SSL_set_verify(SSL *s, int mode,
852                     int (*callback) (int ok, X509_STORE_CTX *ctx))
853 {
854     s->verify_mode = mode;
855     if (callback != NULL)
856         s->verify_callback = callback;
857 }
858 
859 void SSL_set_verify_depth(SSL *s, int depth)
860 {
861     X509_VERIFY_PARAM_set_depth(s->param, depth);
862 }
863 
864 void SSL_set_read_ahead(SSL *s, int yes)
865 {
866     s->read_ahead = yes;
867 }
868 
869 int SSL_get_read_ahead(const SSL *s)
870 {
871     return (s->read_ahead);
872 }
873 
874 int SSL_pending(const SSL *s)
875 {
876     /*
877      * SSL_pending cannot work properly if read-ahead is enabled
878      * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)), and it is
879      * impossible to fix since SSL_pending cannot report errors that may be
880      * observed while scanning the new data. (Note that SSL_pending() is
881      * often used as a boolean value, so we'd better not return -1.)
882      */
883     return (s->method->ssl_pending(s));
884 }
885 
886 X509 *SSL_get_peer_certificate(const SSL *s)
887 {
888     X509 *r;
889 
890     if ((s == NULL) || (s->session == NULL))
891         r = NULL;
892     else
893         r = s->session->peer;
894 
895     if (r == NULL)
896         return (r);
897 
898     CRYPTO_add(&r->references, 1, CRYPTO_LOCK_X509);
899 
900     return (r);
901 }
902 
903 STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s)
904 {
905     STACK_OF(X509) *r;
906 
907     if ((s == NULL) || (s->session == NULL)
908         || (s->session->sess_cert == NULL))
909         r = NULL;
910     else
911         r = s->session->sess_cert->cert_chain;
912 
913     /*
914      * If we are a client, cert_chain includes the peer's own certificate; if
915      * we are a server, it does not.
916      */
917 
918     return (r);
919 }
920 
921 /*
922  * Now in theory, since the calling process own 't' it should be safe to
923  * modify.  We need to be able to read f without being hassled
924  */
925 void SSL_copy_session_id(SSL *t, const SSL *f)
926 {
927     CERT *tmp;
928 
929     /* Do we need to to SSL locking? */
930     SSL_set_session(t, SSL_get_session(f));
931 
932     /*
933      * what if we are setup as SSLv2 but want to talk SSLv3 or vice-versa
934      */
935     if (t->method != f->method) {
936         t->method->ssl_free(t); /* cleanup current */
937         t->method = f->method;  /* change method */
938         t->method->ssl_new(t);  /* setup new */
939     }
940 
941     tmp = t->cert;
942     if (f->cert != NULL) {
943         CRYPTO_add(&f->cert->references, 1, CRYPTO_LOCK_SSL_CERT);
944         t->cert = f->cert;
945     } else
946         t->cert = NULL;
947     if (tmp != NULL)
948         ssl_cert_free(tmp);
949     SSL_set_session_id_context(t, f->sid_ctx, f->sid_ctx_length);
950 }
951 
952 /* Fix this so it checks all the valid key/cert options */
953 int SSL_CTX_check_private_key(const SSL_CTX *ctx)
954 {
955     if ((ctx == NULL) ||
956         (ctx->cert == NULL) || (ctx->cert->key->x509 == NULL)) {
957         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
958                SSL_R_NO_CERTIFICATE_ASSIGNED);
959         return (0);
960     }
961     if (ctx->cert->key->privatekey == NULL) {
962         SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
963                SSL_R_NO_PRIVATE_KEY_ASSIGNED);
964         return (0);
965     }
966     return (X509_check_private_key
967             (ctx->cert->key->x509, ctx->cert->key->privatekey));
968 }
969 
970 /* Fix this function so that it takes an optional type parameter */
971 int SSL_check_private_key(const SSL *ssl)
972 {
973     if (ssl == NULL) {
974         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
975         return (0);
976     }
977     if (ssl->cert == NULL) {
978         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
979         return 0;
980     }
981     if (ssl->cert->key->x509 == NULL) {
982         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
983         return (0);
984     }
985     if (ssl->cert->key->privatekey == NULL) {
986         SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
987         return (0);
988     }
989     return (X509_check_private_key(ssl->cert->key->x509,
990                                    ssl->cert->key->privatekey));
991 }
992 
993 int SSL_accept(SSL *s)
994 {
995     if (s->handshake_func == 0)
996         /* Not properly initialized yet */
997         SSL_set_accept_state(s);
998 
999     return (s->method->ssl_accept(s));
1000 }
1001 
1002 int SSL_connect(SSL *s)
1003 {
1004     if (s->handshake_func == 0)
1005         /* Not properly initialized yet */
1006         SSL_set_connect_state(s);
1007 
1008     return (s->method->ssl_connect(s));
1009 }
1010 
1011 long SSL_get_default_timeout(const SSL *s)
1012 {
1013     return (s->method->get_timeout());
1014 }
1015 
1016 int SSL_read(SSL *s, void *buf, int num)
1017 {
1018     if (s->handshake_func == 0) {
1019         SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
1020         return -1;
1021     }
1022 
1023     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1024         s->rwstate = SSL_NOTHING;
1025         return (0);
1026     }
1027     return (s->method->ssl_read(s, buf, num));
1028 }
1029 
1030 int SSL_peek(SSL *s, void *buf, int num)
1031 {
1032     if (s->handshake_func == 0) {
1033         SSLerr(SSL_F_SSL_PEEK, SSL_R_UNINITIALIZED);
1034         return -1;
1035     }
1036 
1037     if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
1038         return (0);
1039     }
1040     return (s->method->ssl_peek(s, buf, num));
1041 }
1042 
1043 int SSL_write(SSL *s, const void *buf, int num)
1044 {
1045     if (s->handshake_func == 0) {
1046         SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
1047         return -1;
1048     }
1049 
1050     if (s->shutdown & SSL_SENT_SHUTDOWN) {
1051         s->rwstate = SSL_NOTHING;
1052         SSLerr(SSL_F_SSL_WRITE, SSL_R_PROTOCOL_IS_SHUTDOWN);
1053         return (-1);
1054     }
1055     return (s->method->ssl_write(s, buf, num));
1056 }
1057 
1058 int SSL_shutdown(SSL *s)
1059 {
1060     /*
1061      * Note that this function behaves differently from what one might
1062      * expect.  Return values are 0 for no success (yet), 1 for success; but
1063      * calling it once is usually not enough, even if blocking I/O is used
1064      * (see ssl3_shutdown).
1065      */
1066 
1067     if (s->handshake_func == 0) {
1068         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
1069         return -1;
1070     }
1071 
1072     if (!SSL_in_init(s)) {
1073         return s->method->ssl_shutdown(s);
1074     } else {
1075         SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_SHUTDOWN_WHILE_IN_INIT);
1076         return -1;
1077     }
1078 }
1079 
1080 int SSL_renegotiate(SSL *s)
1081 {
1082     if (s->renegotiate == 0)
1083         s->renegotiate = 1;
1084 
1085     s->new_session = 1;
1086 
1087     return (s->method->ssl_renegotiate(s));
1088 }
1089 
1090 int SSL_renegotiate_abbreviated(SSL *s)
1091 {
1092     if (s->renegotiate == 0)
1093         s->renegotiate = 1;
1094 
1095     s->new_session = 0;
1096 
1097     return (s->method->ssl_renegotiate(s));
1098 }
1099 
1100 int SSL_renegotiate_pending(SSL *s)
1101 {
1102     /*
1103      * becomes true when negotiation is requested; false again once a
1104      * handshake has finished
1105      */
1106     return (s->renegotiate != 0);
1107 }
1108 
1109 long SSL_ctrl(SSL *s, int cmd, long larg, void *parg)
1110 {
1111     long l;
1112 
1113     switch (cmd) {
1114     case SSL_CTRL_GET_READ_AHEAD:
1115         return (s->read_ahead);
1116     case SSL_CTRL_SET_READ_AHEAD:
1117         l = s->read_ahead;
1118         s->read_ahead = larg;
1119         return (l);
1120 
1121     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
1122         s->msg_callback_arg = parg;
1123         return 1;
1124 
1125     case SSL_CTRL_OPTIONS:
1126         return (s->options |= larg);
1127     case SSL_CTRL_CLEAR_OPTIONS:
1128         return (s->options &= ~larg);
1129     case SSL_CTRL_MODE:
1130         return (s->mode |= larg);
1131     case SSL_CTRL_CLEAR_MODE:
1132         return (s->mode &= ~larg);
1133     case SSL_CTRL_GET_MAX_CERT_LIST:
1134         return (s->max_cert_list);
1135     case SSL_CTRL_SET_MAX_CERT_LIST:
1136         l = s->max_cert_list;
1137         s->max_cert_list = larg;
1138         return (l);
1139     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
1140         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
1141             return 0;
1142         s->max_send_fragment = larg;
1143         return 1;
1144     case SSL_CTRL_GET_RI_SUPPORT:
1145         if (s->s3)
1146             return s->s3->send_connection_binding;
1147         else
1148             return 0;
1149     case SSL_CTRL_CERT_FLAGS:
1150         return (s->cert->cert_flags |= larg);
1151     case SSL_CTRL_CLEAR_CERT_FLAGS:
1152         return (s->cert->cert_flags &= ~larg);
1153 
1154     case SSL_CTRL_GET_RAW_CIPHERLIST:
1155         if (parg) {
1156             if (s->cert->ciphers_raw == NULL)
1157                 return 0;
1158             *(unsigned char **)parg = s->cert->ciphers_raw;
1159             return (int)s->cert->ciphers_rawlen;
1160         } else
1161             return ssl_put_cipher_by_char(s, NULL, NULL);
1162     default:
1163         return (s->method->ssl_ctrl(s, cmd, larg, parg));
1164     }
1165 }
1166 
1167 long SSL_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
1168 {
1169     switch (cmd) {
1170     case SSL_CTRL_SET_MSG_CALLBACK:
1171         s->msg_callback = (void (*)
1172                            (int write_p, int version, int content_type,
1173                             const void *buf, size_t len, SSL *ssl,
1174                             void *arg))(fp);
1175         return 1;
1176 
1177     default:
1178         return (s->method->ssl_callback_ctrl(s, cmd, fp));
1179     }
1180 }
1181 
1182 LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx)
1183 {
1184     return ctx->sessions;
1185 }
1186 
1187 long SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
1188 {
1189     long l;
1190     /* For some cases with ctx == NULL perform syntax checks */
1191     if (ctx == NULL) {
1192         switch (cmd) {
1193 #ifndef OPENSSL_NO_EC
1194         case SSL_CTRL_SET_CURVES_LIST:
1195             return tls1_set_curves_list(NULL, NULL, parg);
1196 #endif
1197         case SSL_CTRL_SET_SIGALGS_LIST:
1198         case SSL_CTRL_SET_CLIENT_SIGALGS_LIST:
1199             return tls1_set_sigalgs_list(NULL, parg, 0);
1200         default:
1201             return 0;
1202         }
1203     }
1204 
1205     switch (cmd) {
1206     case SSL_CTRL_GET_READ_AHEAD:
1207         return (ctx->read_ahead);
1208     case SSL_CTRL_SET_READ_AHEAD:
1209         l = ctx->read_ahead;
1210         ctx->read_ahead = larg;
1211         return (l);
1212 
1213     case SSL_CTRL_SET_MSG_CALLBACK_ARG:
1214         ctx->msg_callback_arg = parg;
1215         return 1;
1216 
1217     case SSL_CTRL_GET_MAX_CERT_LIST:
1218         return (ctx->max_cert_list);
1219     case SSL_CTRL_SET_MAX_CERT_LIST:
1220         l = ctx->max_cert_list;
1221         ctx->max_cert_list = larg;
1222         return (l);
1223 
1224     case SSL_CTRL_SET_SESS_CACHE_SIZE:
1225         l = ctx->session_cache_size;
1226         ctx->session_cache_size = larg;
1227         return (l);
1228     case SSL_CTRL_GET_SESS_CACHE_SIZE:
1229         return (ctx->session_cache_size);
1230     case SSL_CTRL_SET_SESS_CACHE_MODE:
1231         l = ctx->session_cache_mode;
1232         ctx->session_cache_mode = larg;
1233         return (l);
1234     case SSL_CTRL_GET_SESS_CACHE_MODE:
1235         return (ctx->session_cache_mode);
1236 
1237     case SSL_CTRL_SESS_NUMBER:
1238         return (lh_SSL_SESSION_num_items(ctx->sessions));
1239     case SSL_CTRL_SESS_CONNECT:
1240         return (ctx->stats.sess_connect);
1241     case SSL_CTRL_SESS_CONNECT_GOOD:
1242         return (ctx->stats.sess_connect_good);
1243     case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
1244         return (ctx->stats.sess_connect_renegotiate);
1245     case SSL_CTRL_SESS_ACCEPT:
1246         return (ctx->stats.sess_accept);
1247     case SSL_CTRL_SESS_ACCEPT_GOOD:
1248         return (ctx->stats.sess_accept_good);
1249     case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
1250         return (ctx->stats.sess_accept_renegotiate);
1251     case SSL_CTRL_SESS_HIT:
1252         return (ctx->stats.sess_hit);
1253     case SSL_CTRL_SESS_CB_HIT:
1254         return (ctx->stats.sess_cb_hit);
1255     case SSL_CTRL_SESS_MISSES:
1256         return (ctx->stats.sess_miss);
1257     case SSL_CTRL_SESS_TIMEOUTS:
1258         return (ctx->stats.sess_timeout);
1259     case SSL_CTRL_SESS_CACHE_FULL:
1260         return (ctx->stats.sess_cache_full);
1261     case SSL_CTRL_OPTIONS:
1262         return (ctx->options |= larg);
1263     case SSL_CTRL_CLEAR_OPTIONS:
1264         return (ctx->options &= ~larg);
1265     case SSL_CTRL_MODE:
1266         return (ctx->mode |= larg);
1267     case SSL_CTRL_CLEAR_MODE:
1268         return (ctx->mode &= ~larg);
1269     case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
1270         if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
1271             return 0;
1272         ctx->max_send_fragment = larg;
1273         return 1;
1274     case SSL_CTRL_CERT_FLAGS:
1275         return (ctx->cert->cert_flags |= larg);
1276     case SSL_CTRL_CLEAR_CERT_FLAGS:
1277         return (ctx->cert->cert_flags &= ~larg);
1278     default:
1279         return (ctx->method->ssl_ctx_ctrl(ctx, cmd, larg, parg));
1280     }
1281 }
1282 
1283 long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
1284 {
1285     switch (cmd) {
1286     case SSL_CTRL_SET_MSG_CALLBACK:
1287         ctx->msg_callback = (void (*)
1288                              (int write_p, int version, int content_type,
1289                               const void *buf, size_t len, SSL *ssl,
1290                               void *arg))(fp);
1291         return 1;
1292 
1293     default:
1294         return (ctx->method->ssl_ctx_callback_ctrl(ctx, cmd, fp));
1295     }
1296 }
1297 
1298 int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
1299 {
1300     long l;
1301 
1302     l = a->id - b->id;
1303     if (l == 0L)
1304         return (0);
1305     else
1306         return ((l > 0) ? 1 : -1);
1307 }
1308 
1309 int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap,
1310                           const SSL_CIPHER *const *bp)
1311 {
1312     long l;
1313 
1314     l = (*ap)->id - (*bp)->id;
1315     if (l == 0L)
1316         return (0);
1317     else
1318         return ((l > 0) ? 1 : -1);
1319 }
1320 
1321 /** return a STACK of the ciphers available for the SSL and in order of
1322  * preference */
1323 STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s)
1324 {
1325     if (s != NULL) {
1326         if (s->cipher_list != NULL) {
1327             return (s->cipher_list);
1328         } else if ((s->ctx != NULL) && (s->ctx->cipher_list != NULL)) {
1329             return (s->ctx->cipher_list);
1330         }
1331     }
1332     return (NULL);
1333 }
1334 
1335 /** return a STACK of the ciphers available for the SSL and in order of
1336  * algorithm id */
1337 STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
1338 {
1339     if (s != NULL) {
1340         if (s->cipher_list_by_id != NULL) {
1341             return (s->cipher_list_by_id);
1342         } else if ((s->ctx != NULL) && (s->ctx->cipher_list_by_id != NULL)) {
1343             return (s->ctx->cipher_list_by_id);
1344         }
1345     }
1346     return (NULL);
1347 }
1348 
1349 /** The old interface to get the same thing as SSL_get_ciphers() */
1350 const char *SSL_get_cipher_list(const SSL *s, int n)
1351 {
1352     SSL_CIPHER *c;
1353     STACK_OF(SSL_CIPHER) *sk;
1354 
1355     if (s == NULL)
1356         return (NULL);
1357     sk = SSL_get_ciphers(s);
1358     if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
1359         return (NULL);
1360     c = sk_SSL_CIPHER_value(sk, n);
1361     if (c == NULL)
1362         return (NULL);
1363     return (c->name);
1364 }
1365 
1366 /** specify the ciphers to be used by default by the SSL_CTX */
1367 int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
1368 {
1369     STACK_OF(SSL_CIPHER) *sk;
1370 
1371     sk = ssl_create_cipher_list(ctx->method, &ctx->cipher_list,
1372                                 &ctx->cipher_list_by_id, str, ctx->cert);
1373     /*
1374      * ssl_create_cipher_list may return an empty stack if it was unable to
1375      * find a cipher matching the given rule string (for example if the rule
1376      * string specifies a cipher which has been disabled). This is not an
1377      * error as far as ssl_create_cipher_list is concerned, and hence
1378      * ctx->cipher_list and ctx->cipher_list_by_id has been updated.
1379      */
1380     if (sk == NULL)
1381         return 0;
1382     else if (sk_SSL_CIPHER_num(sk) == 0) {
1383         SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
1384         return 0;
1385     }
1386     return 1;
1387 }
1388 
1389 /** specify the ciphers to be used by the SSL */
1390 int SSL_set_cipher_list(SSL *s, const char *str)
1391 {
1392     STACK_OF(SSL_CIPHER) *sk;
1393 
1394     sk = ssl_create_cipher_list(s->ctx->method, &s->cipher_list,
1395                                 &s->cipher_list_by_id, str, s->cert);
1396     /* see comment in SSL_CTX_set_cipher_list */
1397     if (sk == NULL)
1398         return 0;
1399     else if (sk_SSL_CIPHER_num(sk) == 0) {
1400         SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
1401         return 0;
1402     }
1403     return 1;
1404 }
1405 
1406 /* works well for SSLv2, not so good for SSLv3 */
1407 char *SSL_get_shared_ciphers(const SSL *s, char *buf, int len)
1408 {
1409     char *p;
1410     STACK_OF(SSL_CIPHER) *sk;
1411     SSL_CIPHER *c;
1412     int i;
1413 
1414     if ((s->session == NULL) || (s->session->ciphers == NULL) || (len < 2))
1415         return (NULL);
1416 
1417     p = buf;
1418     sk = s->session->ciphers;
1419 
1420     if (sk_SSL_CIPHER_num(sk) == 0)
1421         return NULL;
1422 
1423     for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
1424         int n;
1425 
1426         c = sk_SSL_CIPHER_value(sk, i);
1427         n = strlen(c->name);
1428         if (n + 1 > len) {
1429             if (p != buf)
1430                 --p;
1431             *p = '\0';
1432             return buf;
1433         }
1434         strcpy(p, c->name);
1435         p += n;
1436         *(p++) = ':';
1437         len -= n + 1;
1438     }
1439     p[-1] = '\0';
1440     return (buf);
1441 }
1442 
1443 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
1444                              unsigned char *p,
1445                              int (*put_cb) (const SSL_CIPHER *,
1446                                             unsigned char *))
1447 {
1448     int i, j = 0;
1449     SSL_CIPHER *c;
1450     CERT *ct = s->cert;
1451     unsigned char *q;
1452     int empty_reneg_info_scsv = !s->renegotiate;
1453     /* Set disabled masks for this session */
1454     ssl_set_client_disabled(s);
1455 
1456     if (sk == NULL)
1457         return (0);
1458     q = p;
1459     if (put_cb == NULL)
1460         put_cb = s->method->put_cipher_by_char;
1461 
1462     for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
1463         c = sk_SSL_CIPHER_value(sk, i);
1464         /* Skip disabled ciphers */
1465         if (c->algorithm_ssl & ct->mask_ssl ||
1466             c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a)
1467             continue;
1468 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
1469         if (c->id == SSL3_CK_SCSV) {
1470             if (!empty_reneg_info_scsv)
1471                 continue;
1472             else
1473                 empty_reneg_info_scsv = 0;
1474         }
1475 #endif
1476         j = put_cb(c, p);
1477         p += j;
1478     }
1479     /*
1480      * If p == q, no ciphers; caller indicates an error. Otherwise, add
1481      * applicable SCSVs.
1482      */
1483     if (p != q) {
1484         if (empty_reneg_info_scsv) {
1485             static SSL_CIPHER scsv = {
1486                 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
1487             };
1488             j = put_cb(&scsv, p);
1489             p += j;
1490 #ifdef OPENSSL_RI_DEBUG
1491             fprintf(stderr,
1492                     "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n");
1493 #endif
1494         }
1495         if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
1496             static SSL_CIPHER scsv = {
1497                 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
1498             };
1499             j = put_cb(&scsv, p);
1500             p += j;
1501         }
1502     }
1503 
1504     return (p - q);
1505 }
1506 
1507 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, unsigned char *p,
1508                                                int num,
1509                                                STACK_OF(SSL_CIPHER) **skp)
1510 {
1511     const SSL_CIPHER *c;
1512     STACK_OF(SSL_CIPHER) *sk;
1513     int i, n;
1514 
1515     if (s->s3)
1516         s->s3->send_connection_binding = 0;
1517 
1518     n = ssl_put_cipher_by_char(s, NULL, NULL);
1519     if (n == 0 || (num % n) != 0) {
1520         SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1521                SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
1522         return (NULL);
1523     }
1524     if ((skp == NULL) || (*skp == NULL)) {
1525         sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
1526         if(sk == NULL) {
1527             SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1528             return NULL;
1529         }
1530     } else {
1531         sk = *skp;
1532         sk_SSL_CIPHER_zero(sk);
1533     }
1534 
1535     if (s->cert->ciphers_raw)
1536         OPENSSL_free(s->cert->ciphers_raw);
1537     s->cert->ciphers_raw = BUF_memdup(p, num);
1538     if (s->cert->ciphers_raw == NULL) {
1539         SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1540         goto err;
1541     }
1542     s->cert->ciphers_rawlen = (size_t)num;
1543 
1544     for (i = 0; i < num; i += n) {
1545         /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
1546         if (s->s3 && (n != 3 || !p[0]) &&
1547             (p[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
1548             (p[n - 1] == (SSL3_CK_SCSV & 0xff))) {
1549             /* SCSV fatal if renegotiating */
1550             if (s->renegotiate) {
1551                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1552                        SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
1553                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1554                 goto err;
1555             }
1556             s->s3->send_connection_binding = 1;
1557             p += n;
1558 #ifdef OPENSSL_RI_DEBUG
1559             fprintf(stderr, "SCSV received by server\n");
1560 #endif
1561             continue;
1562         }
1563 
1564         /* Check for TLS_FALLBACK_SCSV */
1565         if ((n != 3 || !p[0]) &&
1566             (p[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
1567             (p[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
1568             /*
1569              * The SCSV indicates that the client previously tried a higher
1570              * version. Fail if the current version is an unexpected
1571              * downgrade.
1572              */
1573             if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) {
1574                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
1575                        SSL_R_INAPPROPRIATE_FALLBACK);
1576                 if (s->s3)
1577                     ssl3_send_alert(s, SSL3_AL_FATAL,
1578                                     SSL_AD_INAPPROPRIATE_FALLBACK);
1579                 goto err;
1580             }
1581             p += n;
1582             continue;
1583         }
1584 
1585         c = ssl_get_cipher_by_char(s, p);
1586         p += n;
1587         if (c != NULL) {
1588             if (!sk_SSL_CIPHER_push(sk, c)) {
1589                 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1590                 goto err;
1591             }
1592         }
1593     }
1594 
1595     if (skp != NULL)
1596         *skp = sk;
1597     return (sk);
1598  err:
1599     if ((skp == NULL) || (*skp == NULL))
1600         sk_SSL_CIPHER_free(sk);
1601     return (NULL);
1602 }
1603 
1604 #ifndef OPENSSL_NO_TLSEXT
1605 /** return a servername extension value if provided in Client Hello, or NULL.
1606  * So far, only host_name types are defined (RFC 3546).
1607  */
1608 
1609 const char *SSL_get_servername(const SSL *s, const int type)
1610 {
1611     if (type != TLSEXT_NAMETYPE_host_name)
1612         return NULL;
1613 
1614     return s->session && !s->tlsext_hostname ?
1615         s->session->tlsext_hostname : s->tlsext_hostname;
1616 }
1617 
1618 int SSL_get_servername_type(const SSL *s)
1619 {
1620     if (s->session
1621         && (!s->tlsext_hostname ? s->session->
1622             tlsext_hostname : s->tlsext_hostname))
1623         return TLSEXT_NAMETYPE_host_name;
1624     return -1;
1625 }
1626 
1627 /*
1628  * SSL_select_next_proto implements the standard protocol selection. It is
1629  * expected that this function is called from the callback set by
1630  * SSL_CTX_set_next_proto_select_cb. The protocol data is assumed to be a
1631  * vector of 8-bit, length prefixed byte strings. The length byte itself is
1632  * not included in the length. A byte string of length 0 is invalid. No byte
1633  * string may be truncated. The current, but experimental algorithm for
1634  * selecting the protocol is: 1) If the server doesn't support NPN then this
1635  * is indicated to the callback. In this case, the client application has to
1636  * abort the connection or have a default application level protocol. 2) If
1637  * the server supports NPN, but advertises an empty list then the client
1638  * selects the first protcol in its list, but indicates via the API that this
1639  * fallback case was enacted. 3) Otherwise, the client finds the first
1640  * protocol in the server's list that it supports and selects this protocol.
1641  * This is because it's assumed that the server has better information about
1642  * which protocol a client should use. 4) If the client doesn't support any
1643  * of the server's advertised protocols, then this is treated the same as
1644  * case 2. It returns either OPENSSL_NPN_NEGOTIATED if a common protocol was
1645  * found, or OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
1646  */
1647 int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
1648                           const unsigned char *server,
1649                           unsigned int server_len,
1650                           const unsigned char *client,
1651                           unsigned int client_len)
1652 {
1653     unsigned int i, j;
1654     const unsigned char *result;
1655     int status = OPENSSL_NPN_UNSUPPORTED;
1656 
1657     /*
1658      * For each protocol in server preference order, see if we support it.
1659      */
1660     for (i = 0; i < server_len;) {
1661         for (j = 0; j < client_len;) {
1662             if (server[i] == client[j] &&
1663                 memcmp(&server[i + 1], &client[j + 1], server[i]) == 0) {
1664                 /* We found a match */
1665                 result = &server[i];
1666                 status = OPENSSL_NPN_NEGOTIATED;
1667                 goto found;
1668             }
1669             j += client[j];
1670             j++;
1671         }
1672         i += server[i];
1673         i++;
1674     }
1675 
1676     /* There's no overlap between our protocols and the server's list. */
1677     result = client;
1678     status = OPENSSL_NPN_NO_OVERLAP;
1679 
1680  found:
1681     *out = (unsigned char *)result + 1;
1682     *outlen = result[0];
1683     return status;
1684 }
1685 
1686 # ifndef OPENSSL_NO_NEXTPROTONEG
1687 /*
1688  * SSL_get0_next_proto_negotiated sets *data and *len to point to the
1689  * client's requested protocol for this connection and returns 0. If the
1690  * client didn't request any protocol, then *data is set to NULL. Note that
1691  * the client can request any protocol it chooses. The value returned from
1692  * this function need not be a member of the list of supported protocols
1693  * provided by the callback.
1694  */
1695 void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data,
1696                                     unsigned *len)
1697 {
1698     *data = s->next_proto_negotiated;
1699     if (!*data) {
1700         *len = 0;
1701     } else {
1702         *len = s->next_proto_negotiated_len;
1703     }
1704 }
1705 
1706 /*
1707  * SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when
1708  * a TLS server needs a list of supported protocols for Next Protocol
1709  * Negotiation. The returned list must be in wire format.  The list is
1710  * returned by setting |out| to point to it and |outlen| to its length. This
1711  * memory will not be modified, but one should assume that the SSL* keeps a
1712  * reference to it. The callback should return SSL_TLSEXT_ERR_OK if it
1713  * wishes to advertise. Otherwise, no such extension will be included in the
1714  * ServerHello.
1715  */
1716 void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *ctx,
1717                                            int (*cb) (SSL *ssl,
1718                                                       const unsigned char
1719                                                       **out,
1720                                                       unsigned int *outlen,
1721                                                       void *arg), void *arg)
1722 {
1723     ctx->next_protos_advertised_cb = cb;
1724     ctx->next_protos_advertised_cb_arg = arg;
1725 }
1726 
1727 /*
1728  * SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
1729  * client needs to select a protocol from the server's provided list. |out|
1730  * must be set to point to the selected protocol (which may be within |in|).
1731  * The length of the protocol name must be written into |outlen|. The
1732  * server's advertised protocols are provided in |in| and |inlen|. The
1733  * callback can assume that |in| is syntactically valid. The client must
1734  * select a protocol. It is fatal to the connection if this callback returns
1735  * a value other than SSL_TLSEXT_ERR_OK.
1736  */
1737 void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx,
1738                                       int (*cb) (SSL *s, unsigned char **out,
1739                                                  unsigned char *outlen,
1740                                                  const unsigned char *in,
1741                                                  unsigned int inlen,
1742                                                  void *arg), void *arg)
1743 {
1744     ctx->next_proto_select_cb = cb;
1745     ctx->next_proto_select_cb_arg = arg;
1746 }
1747 # endif
1748 
1749 /*
1750  * SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
1751  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
1752  * length-prefixed strings). Returns 0 on success.
1753  */
1754 int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
1755                             unsigned protos_len)
1756 {
1757     if (ctx->alpn_client_proto_list)
1758         OPENSSL_free(ctx->alpn_client_proto_list);
1759 
1760     ctx->alpn_client_proto_list = OPENSSL_malloc(protos_len);
1761     if (!ctx->alpn_client_proto_list)
1762         return 1;
1763     memcpy(ctx->alpn_client_proto_list, protos, protos_len);
1764     ctx->alpn_client_proto_list_len = protos_len;
1765 
1766     return 0;
1767 }
1768 
1769 /*
1770  * SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
1771  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
1772  * length-prefixed strings). Returns 0 on success.
1773  */
1774 int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
1775                         unsigned protos_len)
1776 {
1777     if (ssl->alpn_client_proto_list)
1778         OPENSSL_free(ssl->alpn_client_proto_list);
1779 
1780     ssl->alpn_client_proto_list = OPENSSL_malloc(protos_len);
1781     if (!ssl->alpn_client_proto_list)
1782         return 1;
1783     memcpy(ssl->alpn_client_proto_list, protos, protos_len);
1784     ssl->alpn_client_proto_list_len = protos_len;
1785 
1786     return 0;
1787 }
1788 
1789 /*
1790  * SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is
1791  * called during ClientHello processing in order to select an ALPN protocol
1792  * from the client's list of offered protocols.
1793  */
1794 void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
1795                                 int (*cb) (SSL *ssl,
1796                                            const unsigned char **out,
1797                                            unsigned char *outlen,
1798                                            const unsigned char *in,
1799                                            unsigned int inlen,
1800                                            void *arg), void *arg)
1801 {
1802     ctx->alpn_select_cb = cb;
1803     ctx->alpn_select_cb_arg = arg;
1804 }
1805 
1806 /*
1807  * SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from
1808  * |ssl|. On return it sets |*data| to point to |*len| bytes of protocol name
1809  * (not including the leading length-prefix byte). If the server didn't
1810  * respond with a negotiated protocol then |*len| will be zero.
1811  */
1812 void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
1813                             unsigned *len)
1814 {
1815     *data = NULL;
1816     if (ssl->s3)
1817         *data = ssl->s3->alpn_selected;
1818     if (*data == NULL)
1819         *len = 0;
1820     else
1821         *len = ssl->s3->alpn_selected_len;
1822 }
1823 
1824 #endif                          /* !OPENSSL_NO_TLSEXT */
1825 
1826 int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
1827                                const char *label, size_t llen,
1828                                const unsigned char *p, size_t plen,
1829                                int use_context)
1830 {
1831     if (s->version < TLS1_VERSION && s->version != DTLS1_BAD_VER)
1832         return -1;
1833 
1834     return s->method->ssl3_enc->export_keying_material(s, out, olen, label,
1835                                                        llen, p, plen,
1836                                                        use_context);
1837 }
1838 
1839 static unsigned long ssl_session_hash(const SSL_SESSION *a)
1840 {
1841     unsigned long l;
1842 
1843     l = (unsigned long)
1844         ((unsigned int)a->session_id[0]) |
1845         ((unsigned int)a->session_id[1] << 8L) |
1846         ((unsigned long)a->session_id[2] << 16L) |
1847         ((unsigned long)a->session_id[3] << 24L);
1848     return (l);
1849 }
1850 
1851 /*
1852  * NB: If this function (or indeed the hash function which uses a sort of
1853  * coarser function than this one) is changed, ensure
1854  * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on
1855  * being able to construct an SSL_SESSION that will collide with any existing
1856  * session with a matching session ID.
1857  */
1858 static int ssl_session_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
1859 {
1860     if (a->ssl_version != b->ssl_version)
1861         return (1);
1862     if (a->session_id_length != b->session_id_length)
1863         return (1);
1864     return (memcmp(a->session_id, b->session_id, a->session_id_length));
1865 }
1866 
1867 /*
1868  * These wrapper functions should remain rather than redeclaring
1869  * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
1870  * variable. The reason is that the functions aren't static, they're exposed
1871  * via ssl.h.
1872  */
1873 static IMPLEMENT_LHASH_HASH_FN(ssl_session, SSL_SESSION)
1874 static IMPLEMENT_LHASH_COMP_FN(ssl_session, SSL_SESSION)
1875 
1876 SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
1877 {
1878     SSL_CTX *ret = NULL;
1879 
1880     if (meth == NULL) {
1881         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_NULL_SSL_METHOD_PASSED);
1882         return (NULL);
1883     }
1884 #ifdef OPENSSL_FIPS
1885     if (FIPS_mode() && (meth->version < TLS1_VERSION)) {
1886         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
1887         return NULL;
1888     }
1889 #endif
1890 
1891     if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0) {
1892         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
1893         goto err;
1894     }
1895     ret = (SSL_CTX *)OPENSSL_malloc(sizeof(SSL_CTX));
1896     if (ret == NULL)
1897         goto err;
1898 
1899     memset(ret, 0, sizeof(SSL_CTX));
1900 
1901     ret->method = meth;
1902 
1903     ret->cert_store = NULL;
1904     ret->session_cache_mode = SSL_SESS_CACHE_SERVER;
1905     ret->session_cache_size = SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
1906     ret->session_cache_head = NULL;
1907     ret->session_cache_tail = NULL;
1908 
1909     /* We take the system default */
1910     ret->session_timeout = meth->get_timeout();
1911 
1912     ret->new_session_cb = 0;
1913     ret->remove_session_cb = 0;
1914     ret->get_session_cb = 0;
1915     ret->generate_session_id = 0;
1916 
1917     memset((char *)&ret->stats, 0, sizeof(ret->stats));
1918 
1919     ret->references = 1;
1920     ret->quiet_shutdown = 0;
1921 
1922 /*  ret->cipher=NULL;*/
1923 /*-
1924     ret->s2->challenge=NULL;
1925     ret->master_key=NULL;
1926     ret->key_arg=NULL;
1927     ret->s2->conn_id=NULL; */
1928 
1929     ret->info_callback = NULL;
1930 
1931     ret->app_verify_callback = 0;
1932     ret->app_verify_arg = NULL;
1933 
1934     ret->max_cert_list = SSL_MAX_CERT_LIST_DEFAULT;
1935     ret->read_ahead = 0;
1936     ret->msg_callback = 0;
1937     ret->msg_callback_arg = NULL;
1938     ret->verify_mode = SSL_VERIFY_NONE;
1939 #if 0
1940     ret->verify_depth = -1;     /* Don't impose a limit (but x509_lu.c does) */
1941 #endif
1942     ret->sid_ctx_length = 0;
1943     ret->default_verify_callback = NULL;
1944     if ((ret->cert = ssl_cert_new()) == NULL)
1945         goto err;
1946 
1947     ret->default_passwd_callback = 0;
1948     ret->default_passwd_callback_userdata = NULL;
1949     ret->client_cert_cb = 0;
1950     ret->app_gen_cookie_cb = 0;
1951     ret->app_verify_cookie_cb = 0;
1952 
1953     ret->sessions = lh_SSL_SESSION_new();
1954     if (ret->sessions == NULL)
1955         goto err;
1956     ret->cert_store = X509_STORE_new();
1957     if (ret->cert_store == NULL)
1958         goto err;
1959 
1960     ssl_create_cipher_list(ret->method,
1961                            &ret->cipher_list, &ret->cipher_list_by_id,
1962                            meth->version ==
1963                            SSL2_VERSION ? "SSLv2" : SSL_DEFAULT_CIPHER_LIST,
1964                            ret->cert);
1965     if (ret->cipher_list == NULL || sk_SSL_CIPHER_num(ret->cipher_list) <= 0) {
1966         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_LIBRARY_HAS_NO_CIPHERS);
1967         goto err2;
1968     }
1969 
1970     ret->param = X509_VERIFY_PARAM_new();
1971     if (!ret->param)
1972         goto err;
1973 
1974     if ((ret->rsa_md5 = EVP_get_digestbyname("ssl2-md5")) == NULL) {
1975         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL2_MD5_ROUTINES);
1976         goto err2;
1977     }
1978     if ((ret->md5 = EVP_get_digestbyname("ssl3-md5")) == NULL) {
1979         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
1980         goto err2;
1981     }
1982     if ((ret->sha1 = EVP_get_digestbyname("ssl3-sha1")) == NULL) {
1983         SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
1984         goto err2;
1985     }
1986 
1987     if ((ret->client_CA = sk_X509_NAME_new_null()) == NULL)
1988         goto err;
1989 
1990     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data);
1991 
1992     ret->extra_certs = NULL;
1993     /* No compression for DTLS */
1994     if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS))
1995         ret->comp_methods = SSL_COMP_get_compression_methods();
1996 
1997     ret->max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
1998 
1999 #ifndef OPENSSL_NO_TLSEXT
2000     ret->tlsext_servername_callback = 0;
2001     ret->tlsext_servername_arg = NULL;
2002     /* Setup RFC4507 ticket keys */
2003     if ((RAND_bytes(ret->tlsext_tick_key_name, 16) <= 0)
2004         || (RAND_bytes(ret->tlsext_tick_hmac_key, 16) <= 0)
2005         || (RAND_bytes(ret->tlsext_tick_aes_key, 16) <= 0))
2006         ret->options |= SSL_OP_NO_TICKET;
2007 
2008     ret->tlsext_status_cb = 0;
2009     ret->tlsext_status_arg = NULL;
2010 
2011 # ifndef OPENSSL_NO_NEXTPROTONEG
2012     ret->next_protos_advertised_cb = 0;
2013     ret->next_proto_select_cb = 0;
2014 # endif
2015 #endif
2016 #ifndef OPENSSL_NO_PSK
2017     ret->psk_identity_hint = NULL;
2018     ret->psk_client_callback = NULL;
2019     ret->psk_server_callback = NULL;
2020 #endif
2021 #ifndef OPENSSL_NO_SRP
2022     SSL_CTX_SRP_CTX_init(ret);
2023 #endif
2024 #ifndef OPENSSL_NO_BUF_FREELISTS
2025     ret->freelist_max_len = SSL_MAX_BUF_FREELIST_LEN_DEFAULT;
2026     ret->rbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
2027     if (!ret->rbuf_freelist)
2028         goto err;
2029     ret->rbuf_freelist->chunklen = 0;
2030     ret->rbuf_freelist->len = 0;
2031     ret->rbuf_freelist->head = NULL;
2032     ret->wbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
2033     if (!ret->wbuf_freelist) {
2034         OPENSSL_free(ret->rbuf_freelist);
2035         goto err;
2036     }
2037     ret->wbuf_freelist->chunklen = 0;
2038     ret->wbuf_freelist->len = 0;
2039     ret->wbuf_freelist->head = NULL;
2040 #endif
2041 #ifndef OPENSSL_NO_ENGINE
2042     ret->client_cert_engine = NULL;
2043 # ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
2044 #  define eng_strx(x)     #x
2045 #  define eng_str(x)      eng_strx(x)
2046     /* Use specific client engine automatically... ignore errors */
2047     {
2048         ENGINE *eng;
2049         eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
2050         if (!eng) {
2051             ERR_clear_error();
2052             ENGINE_load_builtin_engines();
2053             eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
2054         }
2055         if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
2056             ERR_clear_error();
2057     }
2058 # endif
2059 #endif
2060     /*
2061      * Default is to connect to non-RI servers. When RI is more widely
2062      * deployed might change this.
2063      */
2064     ret->options |= SSL_OP_LEGACY_SERVER_CONNECT;
2065 
2066     /*
2067      * Disable SSLv2 by default, callers that want to enable SSLv2 will have to
2068      * explicitly clear this option via either of SSL_CTX_clear_options() or
2069      * SSL_clear_options().
2070      */
2071     ret->options |= SSL_OP_NO_SSLv2;
2072 
2073     return (ret);
2074  err:
2075     SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
2076  err2:
2077     if (ret != NULL)
2078         SSL_CTX_free(ret);
2079     return (NULL);
2080 }
2081 
2082 #if 0
2083 static void SSL_COMP_free(SSL_COMP *comp)
2084 {
2085     OPENSSL_free(comp);
2086 }
2087 #endif
2088 
2089 #ifndef OPENSSL_NO_BUF_FREELISTS
2090 static void ssl_buf_freelist_free(SSL3_BUF_FREELIST *list)
2091 {
2092     SSL3_BUF_FREELIST_ENTRY *ent, *next;
2093     for (ent = list->head; ent; ent = next) {
2094         next = ent->next;
2095         OPENSSL_free(ent);
2096     }
2097     OPENSSL_free(list);
2098 }
2099 #endif
2100 
2101 void SSL_CTX_free(SSL_CTX *a)
2102 {
2103     int i;
2104 
2105     if (a == NULL)
2106         return;
2107 
2108     i = CRYPTO_add(&a->references, -1, CRYPTO_LOCK_SSL_CTX);
2109 #ifdef REF_PRINT
2110     REF_PRINT("SSL_CTX", a);
2111 #endif
2112     if (i > 0)
2113         return;
2114 #ifdef REF_CHECK
2115     if (i < 0) {
2116         fprintf(stderr, "SSL_CTX_free, bad reference count\n");
2117         abort();                /* ok */
2118     }
2119 #endif
2120 
2121     if (a->param)
2122         X509_VERIFY_PARAM_free(a->param);
2123 
2124     /*
2125      * Free internal session cache. However: the remove_cb() may reference
2126      * the ex_data of SSL_CTX, thus the ex_data store can only be removed
2127      * after the sessions were flushed.
2128      * As the ex_data handling routines might also touch the session cache,
2129      * the most secure solution seems to be: empty (flush) the cache, then
2130      * free ex_data, then finally free the cache.
2131      * (See ticket [openssl.org #212].)
2132      */
2133     if (a->sessions != NULL)
2134         SSL_CTX_flush_sessions(a, 0);
2135 
2136     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);
2137 
2138     if (a->sessions != NULL)
2139         lh_SSL_SESSION_free(a->sessions);
2140 
2141     if (a->cert_store != NULL)
2142         X509_STORE_free(a->cert_store);
2143     if (a->cipher_list != NULL)
2144         sk_SSL_CIPHER_free(a->cipher_list);
2145     if (a->cipher_list_by_id != NULL)
2146         sk_SSL_CIPHER_free(a->cipher_list_by_id);
2147     if (a->cert != NULL)
2148         ssl_cert_free(a->cert);
2149     if (a->client_CA != NULL)
2150         sk_X509_NAME_pop_free(a->client_CA, X509_NAME_free);
2151     if (a->extra_certs != NULL)
2152         sk_X509_pop_free(a->extra_certs, X509_free);
2153 #if 0                           /* This should never be done, since it
2154                                  * removes a global database */
2155     if (a->comp_methods != NULL)
2156         sk_SSL_COMP_pop_free(a->comp_methods, SSL_COMP_free);
2157 #else
2158     a->comp_methods = NULL;
2159 #endif
2160 
2161 #ifndef OPENSSL_NO_SRTP
2162     if (a->srtp_profiles)
2163         sk_SRTP_PROTECTION_PROFILE_free(a->srtp_profiles);
2164 #endif
2165 
2166 #ifndef OPENSSL_NO_PSK
2167     if (a->psk_identity_hint)
2168         OPENSSL_free(a->psk_identity_hint);
2169 #endif
2170 #ifndef OPENSSL_NO_SRP
2171     SSL_CTX_SRP_CTX_free(a);
2172 #endif
2173 #ifndef OPENSSL_NO_ENGINE
2174     if (a->client_cert_engine)
2175         ENGINE_finish(a->client_cert_engine);
2176 #endif
2177 
2178 #ifndef OPENSSL_NO_BUF_FREELISTS
2179     if (a->wbuf_freelist)
2180         ssl_buf_freelist_free(a->wbuf_freelist);
2181     if (a->rbuf_freelist)
2182         ssl_buf_freelist_free(a->rbuf_freelist);
2183 #endif
2184 #ifndef OPENSSL_NO_TLSEXT
2185 # ifndef OPENSSL_NO_EC
2186     if (a->tlsext_ecpointformatlist)
2187         OPENSSL_free(a->tlsext_ecpointformatlist);
2188     if (a->tlsext_ellipticcurvelist)
2189         OPENSSL_free(a->tlsext_ellipticcurvelist);
2190 # endif                         /* OPENSSL_NO_EC */
2191     if (a->alpn_client_proto_list != NULL)
2192         OPENSSL_free(a->alpn_client_proto_list);
2193 #endif
2194 
2195     OPENSSL_free(a);
2196 }
2197 
2198 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
2199 {
2200     ctx->default_passwd_callback = cb;
2201 }
2202 
2203 void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u)
2204 {
2205     ctx->default_passwd_callback_userdata = u;
2206 }
2207 
2208 void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
2209                                       int (*cb) (X509_STORE_CTX *, void *),
2210                                       void *arg)
2211 {
2212     ctx->app_verify_callback = cb;
2213     ctx->app_verify_arg = arg;
2214 }
2215 
2216 void SSL_CTX_set_verify(SSL_CTX *ctx, int mode,
2217                         int (*cb) (int, X509_STORE_CTX *))
2218 {
2219     ctx->verify_mode = mode;
2220     ctx->default_verify_callback = cb;
2221 }
2222 
2223 void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth)
2224 {
2225     X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2226 }
2227 
2228 void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb) (SSL *ssl, void *arg),
2229                          void *arg)
2230 {
2231     ssl_cert_set_cert_cb(c->cert, cb, arg);
2232 }
2233 
2234 void SSL_set_cert_cb(SSL *s, int (*cb) (SSL *ssl, void *arg), void *arg)
2235 {
2236     ssl_cert_set_cert_cb(s->cert, cb, arg);
2237 }
2238 
2239 void ssl_set_cert_masks(CERT *c, const SSL_CIPHER *cipher)
2240 {
2241     CERT_PKEY *cpk;
2242     int rsa_enc, rsa_tmp, rsa_sign, dh_tmp, dh_rsa, dh_dsa, dsa_sign;
2243     int rsa_enc_export, dh_rsa_export, dh_dsa_export;
2244     int rsa_tmp_export, dh_tmp_export, kl;
2245     unsigned long mask_k, mask_a, emask_k, emask_a;
2246 #ifndef OPENSSL_NO_ECDSA
2247     int have_ecc_cert, ecdsa_ok, ecc_pkey_size;
2248 #endif
2249 #ifndef OPENSSL_NO_ECDH
2250     int have_ecdh_tmp, ecdh_ok;
2251 #endif
2252 #ifndef OPENSSL_NO_EC
2253     X509 *x = NULL;
2254     EVP_PKEY *ecc_pkey = NULL;
2255     int signature_nid = 0, pk_nid = 0, md_nid = 0;
2256 #endif
2257     if (c == NULL)
2258         return;
2259 
2260     kl = SSL_C_EXPORT_PKEYLENGTH(cipher);
2261 
2262 #ifndef OPENSSL_NO_RSA
2263     rsa_tmp = (c->rsa_tmp != NULL || c->rsa_tmp_cb != NULL);
2264     rsa_tmp_export = (c->rsa_tmp_cb != NULL ||
2265                       (rsa_tmp && RSA_size(c->rsa_tmp) * 8 <= kl));
2266 #else
2267     rsa_tmp = rsa_tmp_export = 0;
2268 #endif
2269 #ifndef OPENSSL_NO_DH
2270     dh_tmp = (c->dh_tmp != NULL || c->dh_tmp_cb != NULL);
2271     dh_tmp_export = (c->dh_tmp_cb != NULL ||
2272                      (dh_tmp && DH_size(c->dh_tmp) * 8 <= kl));
2273 #else
2274     dh_tmp = dh_tmp_export = 0;
2275 #endif
2276 
2277 #ifndef OPENSSL_NO_ECDH
2278     have_ecdh_tmp = (c->ecdh_tmp || c->ecdh_tmp_cb || c->ecdh_tmp_auto);
2279 #endif
2280     cpk = &(c->pkeys[SSL_PKEY_RSA_ENC]);
2281     rsa_enc = cpk->valid_flags & CERT_PKEY_VALID;
2282     rsa_enc_export = (rsa_enc && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2283     cpk = &(c->pkeys[SSL_PKEY_RSA_SIGN]);
2284     rsa_sign = cpk->valid_flags & CERT_PKEY_SIGN;
2285     cpk = &(c->pkeys[SSL_PKEY_DSA_SIGN]);
2286     dsa_sign = cpk->valid_flags & CERT_PKEY_SIGN;
2287     cpk = &(c->pkeys[SSL_PKEY_DH_RSA]);
2288     dh_rsa = cpk->valid_flags & CERT_PKEY_VALID;
2289     dh_rsa_export = (dh_rsa && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2290     cpk = &(c->pkeys[SSL_PKEY_DH_DSA]);
2291 /* FIX THIS EAY EAY EAY */
2292     dh_dsa = cpk->valid_flags & CERT_PKEY_VALID;
2293     dh_dsa_export = (dh_dsa && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
2294     cpk = &(c->pkeys[SSL_PKEY_ECC]);
2295 #ifndef OPENSSL_NO_EC
2296     have_ecc_cert = cpk->valid_flags & CERT_PKEY_VALID;
2297 #endif
2298     mask_k = 0;
2299     mask_a = 0;
2300     emask_k = 0;
2301     emask_a = 0;
2302 
2303 #ifdef CIPHER_DEBUG
2304     fprintf(stderr,
2305             "rt=%d rte=%d dht=%d ecdht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
2306             rsa_tmp, rsa_tmp_export, dh_tmp, have_ecdh_tmp, rsa_enc,
2307             rsa_enc_export, rsa_sign, dsa_sign, dh_rsa, dh_dsa);
2308 #endif
2309 
2310     cpk = &(c->pkeys[SSL_PKEY_GOST01]);
2311     if (cpk->x509 != NULL && cpk->privatekey != NULL) {
2312         mask_k |= SSL_kGOST;
2313         mask_a |= SSL_aGOST01;
2314     }
2315     cpk = &(c->pkeys[SSL_PKEY_GOST94]);
2316     if (cpk->x509 != NULL && cpk->privatekey != NULL) {
2317         mask_k |= SSL_kGOST;
2318         mask_a |= SSL_aGOST94;
2319     }
2320 
2321     if (rsa_enc || (rsa_tmp && rsa_sign))
2322         mask_k |= SSL_kRSA;
2323     if (rsa_enc_export || (rsa_tmp_export && (rsa_sign || rsa_enc)))
2324         emask_k |= SSL_kRSA;
2325 
2326 #if 0
2327     /* The match needs to be both kEDH and aRSA or aDSA, so don't worry */
2328     if ((dh_tmp || dh_rsa || dh_dsa) && (rsa_enc || rsa_sign || dsa_sign))
2329         mask_k |= SSL_kEDH;
2330     if ((dh_tmp_export || dh_rsa_export || dh_dsa_export) &&
2331         (rsa_enc || rsa_sign || dsa_sign))
2332         emask_k |= SSL_kEDH;
2333 #endif
2334 
2335     if (dh_tmp_export)
2336         emask_k |= SSL_kEDH;
2337 
2338     if (dh_tmp)
2339         mask_k |= SSL_kEDH;
2340 
2341     if (dh_rsa)
2342         mask_k |= SSL_kDHr;
2343     if (dh_rsa_export)
2344         emask_k |= SSL_kDHr;
2345 
2346     if (dh_dsa)
2347         mask_k |= SSL_kDHd;
2348     if (dh_dsa_export)
2349         emask_k |= SSL_kDHd;
2350 
2351     if (mask_k & (SSL_kDHr | SSL_kDHd))
2352         mask_a |= SSL_aDH;
2353 
2354     if (rsa_enc || rsa_sign) {
2355         mask_a |= SSL_aRSA;
2356         emask_a |= SSL_aRSA;
2357     }
2358 
2359     if (dsa_sign) {
2360         mask_a |= SSL_aDSS;
2361         emask_a |= SSL_aDSS;
2362     }
2363 
2364     mask_a |= SSL_aNULL;
2365     emask_a |= SSL_aNULL;
2366 
2367 #ifndef OPENSSL_NO_KRB5
2368     mask_k |= SSL_kKRB5;
2369     mask_a |= SSL_aKRB5;
2370     emask_k |= SSL_kKRB5;
2371     emask_a |= SSL_aKRB5;
2372 #endif
2373 
2374     /*
2375      * An ECC certificate may be usable for ECDH and/or ECDSA cipher suites
2376      * depending on the key usage extension.
2377      */
2378 #ifndef OPENSSL_NO_EC
2379     if (have_ecc_cert) {
2380         cpk = &c->pkeys[SSL_PKEY_ECC];
2381         x = cpk->x509;
2382         /* This call populates extension flags (ex_flags) */
2383         X509_check_purpose(x, -1, 0);
2384 # ifndef OPENSSL_NO_ECDH
2385         ecdh_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
2386             (x->ex_kusage & X509v3_KU_KEY_AGREEMENT) : 1;
2387 # endif
2388         ecdsa_ok = (x->ex_flags & EXFLAG_KUSAGE) ?
2389             (x->ex_kusage & X509v3_KU_DIGITAL_SIGNATURE) : 1;
2390         if (!(cpk->valid_flags & CERT_PKEY_SIGN))
2391             ecdsa_ok = 0;
2392         ecc_pkey = X509_get_pubkey(x);
2393         ecc_pkey_size = (ecc_pkey != NULL) ? EVP_PKEY_bits(ecc_pkey) : 0;
2394         EVP_PKEY_free(ecc_pkey);
2395         if ((x->sig_alg) && (x->sig_alg->algorithm)) {
2396             signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
2397             OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
2398         }
2399 # ifndef OPENSSL_NO_ECDH
2400         if (ecdh_ok) {
2401 
2402             if (pk_nid == NID_rsaEncryption || pk_nid == NID_rsa) {
2403                 mask_k |= SSL_kECDHr;
2404                 mask_a |= SSL_aECDH;
2405                 if (ecc_pkey_size <= 163) {
2406                     emask_k |= SSL_kECDHr;
2407                     emask_a |= SSL_aECDH;
2408                 }
2409             }
2410 
2411             if (pk_nid == NID_X9_62_id_ecPublicKey) {
2412                 mask_k |= SSL_kECDHe;
2413                 mask_a |= SSL_aECDH;
2414                 if (ecc_pkey_size <= 163) {
2415                     emask_k |= SSL_kECDHe;
2416                     emask_a |= SSL_aECDH;
2417                 }
2418             }
2419         }
2420 # endif
2421 # ifndef OPENSSL_NO_ECDSA
2422         if (ecdsa_ok) {
2423             mask_a |= SSL_aECDSA;
2424             emask_a |= SSL_aECDSA;
2425         }
2426 # endif
2427     }
2428 #endif
2429 
2430 #ifndef OPENSSL_NO_ECDH
2431     if (have_ecdh_tmp) {
2432         mask_k |= SSL_kEECDH;
2433         emask_k |= SSL_kEECDH;
2434     }
2435 #endif
2436 
2437 #ifndef OPENSSL_NO_PSK
2438     mask_k |= SSL_kPSK;
2439     mask_a |= SSL_aPSK;
2440     emask_k |= SSL_kPSK;
2441     emask_a |= SSL_aPSK;
2442 #endif
2443 
2444     c->mask_k = mask_k;
2445     c->mask_a = mask_a;
2446     c->export_mask_k = emask_k;
2447     c->export_mask_a = emask_a;
2448     c->valid = 1;
2449 }
2450 
2451 /* This handy macro borrowed from crypto/x509v3/v3_purp.c */
2452 #define ku_reject(x, usage) \
2453         (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
2454 
2455 #ifndef OPENSSL_NO_EC
2456 
2457 int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
2458 {
2459     unsigned long alg_k, alg_a;
2460     EVP_PKEY *pkey = NULL;
2461     int keysize = 0;
2462     int signature_nid = 0, md_nid = 0, pk_nid = 0;
2463     const SSL_CIPHER *cs = s->s3->tmp.new_cipher;
2464 
2465     alg_k = cs->algorithm_mkey;
2466     alg_a = cs->algorithm_auth;
2467 
2468     if (SSL_C_IS_EXPORT(cs)) {
2469         /* ECDH key length in export ciphers must be <= 163 bits */
2470         pkey = X509_get_pubkey(x);
2471         if (pkey == NULL)
2472             return 0;
2473         keysize = EVP_PKEY_bits(pkey);
2474         EVP_PKEY_free(pkey);
2475         if (keysize > 163)
2476             return 0;
2477     }
2478 
2479     /* This call populates the ex_flags field correctly */
2480     X509_check_purpose(x, -1, 0);
2481     if ((x->sig_alg) && (x->sig_alg->algorithm)) {
2482         signature_nid = OBJ_obj2nid(x->sig_alg->algorithm);
2483         OBJ_find_sigid_algs(signature_nid, &md_nid, &pk_nid);
2484     }
2485     if (alg_k & SSL_kECDHe || alg_k & SSL_kECDHr) {
2486         /* key usage, if present, must allow key agreement */
2487         if (ku_reject(x, X509v3_KU_KEY_AGREEMENT)) {
2488             SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2489                    SSL_R_ECC_CERT_NOT_FOR_KEY_AGREEMENT);
2490             return 0;
2491         }
2492         if ((alg_k & SSL_kECDHe) && TLS1_get_version(s) < TLS1_2_VERSION) {
2493             /* signature alg must be ECDSA */
2494             if (pk_nid != NID_X9_62_id_ecPublicKey) {
2495                 SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2496                        SSL_R_ECC_CERT_SHOULD_HAVE_SHA1_SIGNATURE);
2497                 return 0;
2498             }
2499         }
2500         if ((alg_k & SSL_kECDHr) && TLS1_get_version(s) < TLS1_2_VERSION) {
2501             /* signature alg must be RSA */
2502 
2503             if (pk_nid != NID_rsaEncryption && pk_nid != NID_rsa) {
2504                 SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2505                        SSL_R_ECC_CERT_SHOULD_HAVE_RSA_SIGNATURE);
2506                 return 0;
2507             }
2508         }
2509     }
2510     if (alg_a & SSL_aECDSA) {
2511         /* key usage, if present, must allow signing */
2512         if (ku_reject(x, X509v3_KU_DIGITAL_SIGNATURE)) {
2513             SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
2514                    SSL_R_ECC_CERT_NOT_FOR_SIGNING);
2515             return 0;
2516         }
2517     }
2518 
2519     return 1;                   /* all checks are ok */
2520 }
2521 
2522 #endif
2523 
2524 static int ssl_get_server_cert_index(const SSL *s)
2525 {
2526     int idx;
2527     idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
2528     if (idx == SSL_PKEY_RSA_ENC && !s->cert->pkeys[SSL_PKEY_RSA_ENC].x509)
2529         idx = SSL_PKEY_RSA_SIGN;
2530     if (idx == -1)
2531         SSLerr(SSL_F_SSL_GET_SERVER_CERT_INDEX, ERR_R_INTERNAL_ERROR);
2532     return idx;
2533 }
2534 
2535 CERT_PKEY *ssl_get_server_send_pkey(const SSL *s)
2536 {
2537     CERT *c;
2538     int i;
2539 
2540     c = s->cert;
2541     if (!s->s3 || !s->s3->tmp.new_cipher)
2542         return NULL;
2543     ssl_set_cert_masks(c, s->s3->tmp.new_cipher);
2544 
2545 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
2546     /*
2547      * Broken protocol test: return last used certificate: which may mismatch
2548      * the one expected.
2549      */
2550     if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
2551         return c->key;
2552 #endif
2553 
2554     i = ssl_get_server_cert_index(s);
2555 
2556     /* This may or may not be an error. */
2557     if (i < 0)
2558         return NULL;
2559 
2560     /* May be NULL. */
2561     return &c->pkeys[i];
2562 }
2563 
2564 EVP_PKEY *ssl_get_sign_pkey(SSL *s, const SSL_CIPHER *cipher,
2565                             const EVP_MD **pmd)
2566 {
2567     unsigned long alg_a;
2568     CERT *c;
2569     int idx = -1;
2570 
2571     alg_a = cipher->algorithm_auth;
2572     c = s->cert;
2573 
2574 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
2575     /*
2576      * Broken protocol test: use last key: which may mismatch the one
2577      * expected.
2578      */
2579     if (c->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
2580         idx = c->key - c->pkeys;
2581     else
2582 #endif
2583 
2584     if ((alg_a & SSL_aDSS) &&
2585             (c->pkeys[SSL_PKEY_DSA_SIGN].privatekey != NULL))
2586         idx = SSL_PKEY_DSA_SIGN;
2587     else if (alg_a & SSL_aRSA) {
2588         if (c->pkeys[SSL_PKEY_RSA_SIGN].privatekey != NULL)
2589             idx = SSL_PKEY_RSA_SIGN;
2590         else if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey != NULL)
2591             idx = SSL_PKEY_RSA_ENC;
2592     } else if ((alg_a & SSL_aECDSA) &&
2593                (c->pkeys[SSL_PKEY_ECC].privatekey != NULL))
2594         idx = SSL_PKEY_ECC;
2595     if (idx == -1) {
2596         SSLerr(SSL_F_SSL_GET_SIGN_PKEY, ERR_R_INTERNAL_ERROR);
2597         return (NULL);
2598     }
2599     if (pmd)
2600         *pmd = c->pkeys[idx].digest;
2601     return c->pkeys[idx].privatekey;
2602 }
2603 
2604 #ifndef OPENSSL_NO_TLSEXT
2605 int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
2606                                    size_t *serverinfo_length)
2607 {
2608     CERT *c = NULL;
2609     int i = 0;
2610     *serverinfo_length = 0;
2611 
2612     c = s->cert;
2613     i = ssl_get_server_cert_index(s);
2614 
2615     if (i == -1)
2616         return 0;
2617     if (c->pkeys[i].serverinfo == NULL)
2618         return 0;
2619 
2620     *serverinfo = c->pkeys[i].serverinfo;
2621     *serverinfo_length = c->pkeys[i].serverinfo_length;
2622     return 1;
2623 }
2624 #endif
2625 
2626 void ssl_update_cache(SSL *s, int mode)
2627 {
2628     int i;
2629 
2630     /*
2631      * If the session_id_length is 0, we are not supposed to cache it, and it
2632      * would be rather hard to do anyway :-)
2633      */
2634     if (s->session->session_id_length == 0)
2635         return;
2636 
2637     i = s->session_ctx->session_cache_mode;
2638     if ((i & mode) && (!s->hit)
2639         && ((i & SSL_SESS_CACHE_NO_INTERNAL_STORE)
2640             || SSL_CTX_add_session(s->session_ctx, s->session))
2641         && (s->session_ctx->new_session_cb != NULL)) {
2642         CRYPTO_add(&s->session->references, 1, CRYPTO_LOCK_SSL_SESSION);
2643         if (!s->session_ctx->new_session_cb(s, s->session))
2644             SSL_SESSION_free(s->session);
2645     }
2646 
2647     /* auto flush every 255 connections */
2648     if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) && ((i & mode) == mode)) {
2649         if ((((mode & SSL_SESS_CACHE_CLIENT)
2650               ? s->session_ctx->stats.sess_connect_good
2651               : s->session_ctx->stats.sess_accept_good) & 0xff) == 0xff) {
2652             SSL_CTX_flush_sessions(s->session_ctx, (unsigned long)time(NULL));
2653         }
2654     }
2655 }
2656 
2657 const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx)
2658 {
2659     return ctx->method;
2660 }
2661 
2662 const SSL_METHOD *SSL_get_ssl_method(SSL *s)
2663 {
2664     return (s->method);
2665 }
2666 
2667 int SSL_set_ssl_method(SSL *s, const SSL_METHOD *meth)
2668 {
2669     int conn = -1;
2670     int ret = 1;
2671 
2672     if (s->method != meth) {
2673         if (s->handshake_func != NULL)
2674             conn = (s->handshake_func == s->method->ssl_connect);
2675 
2676         if (s->method->version == meth->version)
2677             s->method = meth;
2678         else {
2679             s->method->ssl_free(s);
2680             s->method = meth;
2681             ret = s->method->ssl_new(s);
2682         }
2683 
2684         if (conn == 1)
2685             s->handshake_func = meth->ssl_connect;
2686         else if (conn == 0)
2687             s->handshake_func = meth->ssl_accept;
2688     }
2689     return (ret);
2690 }
2691 
2692 int SSL_get_error(const SSL *s, int i)
2693 {
2694     int reason;
2695     unsigned long l;
2696     BIO *bio;
2697 
2698     if (i > 0)
2699         return (SSL_ERROR_NONE);
2700 
2701     /*
2702      * Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake etc,
2703      * where we do encode the error
2704      */
2705     if ((l = ERR_peek_error()) != 0) {
2706         if (ERR_GET_LIB(l) == ERR_LIB_SYS)
2707             return (SSL_ERROR_SYSCALL);
2708         else
2709             return (SSL_ERROR_SSL);
2710     }
2711 
2712     if ((i < 0) && SSL_want_read(s)) {
2713         bio = SSL_get_rbio(s);
2714         if (BIO_should_read(bio))
2715             return (SSL_ERROR_WANT_READ);
2716         else if (BIO_should_write(bio))
2717             /*
2718              * This one doesn't make too much sense ... We never try to write
2719              * to the rbio, and an application program where rbio and wbio
2720              * are separate couldn't even know what it should wait for.
2721              * However if we ever set s->rwstate incorrectly (so that we have
2722              * SSL_want_read(s) instead of SSL_want_write(s)) and rbio and
2723              * wbio *are* the same, this test works around that bug; so it
2724              * might be safer to keep it.
2725              */
2726             return (SSL_ERROR_WANT_WRITE);
2727         else if (BIO_should_io_special(bio)) {
2728             reason = BIO_get_retry_reason(bio);
2729             if (reason == BIO_RR_CONNECT)
2730                 return (SSL_ERROR_WANT_CONNECT);
2731             else if (reason == BIO_RR_ACCEPT)
2732                 return (SSL_ERROR_WANT_ACCEPT);
2733             else
2734                 return (SSL_ERROR_SYSCALL); /* unknown */
2735         }
2736     }
2737 
2738     if ((i < 0) && SSL_want_write(s)) {
2739         bio = SSL_get_wbio(s);
2740         if (BIO_should_write(bio))
2741             return (SSL_ERROR_WANT_WRITE);
2742         else if (BIO_should_read(bio))
2743             /*
2744              * See above (SSL_want_read(s) with BIO_should_write(bio))
2745              */
2746             return (SSL_ERROR_WANT_READ);
2747         else if (BIO_should_io_special(bio)) {
2748             reason = BIO_get_retry_reason(bio);
2749             if (reason == BIO_RR_CONNECT)
2750                 return (SSL_ERROR_WANT_CONNECT);
2751             else if (reason == BIO_RR_ACCEPT)
2752                 return (SSL_ERROR_WANT_ACCEPT);
2753             else
2754                 return (SSL_ERROR_SYSCALL);
2755         }
2756     }
2757     if ((i < 0) && SSL_want_x509_lookup(s)) {
2758         return (SSL_ERROR_WANT_X509_LOOKUP);
2759     }
2760 
2761     if (i == 0) {
2762         if (s->version == SSL2_VERSION) {
2763             /* assume it is the socket being closed */
2764             return (SSL_ERROR_ZERO_RETURN);
2765         } else {
2766             if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
2767                 (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
2768                 return (SSL_ERROR_ZERO_RETURN);
2769         }
2770     }
2771     return (SSL_ERROR_SYSCALL);
2772 }
2773 
2774 int SSL_do_handshake(SSL *s)
2775 {
2776     int ret = 1;
2777 
2778     if (s->handshake_func == NULL) {
2779         SSLerr(SSL_F_SSL_DO_HANDSHAKE, SSL_R_CONNECTION_TYPE_NOT_SET);
2780         return (-1);
2781     }
2782 
2783     s->method->ssl_renegotiate_check(s);
2784 
2785     if (SSL_in_init(s) || SSL_in_before(s)) {
2786         ret = s->handshake_func(s);
2787     }
2788     return (ret);
2789 }
2790 
2791 /*
2792  * For the next 2 functions, SSL_clear() sets shutdown and so one of these
2793  * calls will reset it
2794  */
2795 void SSL_set_accept_state(SSL *s)
2796 {
2797     s->server = 1;
2798     s->shutdown = 0;
2799     s->state = SSL_ST_ACCEPT | SSL_ST_BEFORE;
2800     s->handshake_func = s->method->ssl_accept;
2801     /* clear the current cipher */
2802     ssl_clear_cipher_ctx(s);
2803     ssl_clear_hash_ctx(&s->read_hash);
2804     ssl_clear_hash_ctx(&s->write_hash);
2805 }
2806 
2807 void SSL_set_connect_state(SSL *s)
2808 {
2809     s->server = 0;
2810     s->shutdown = 0;
2811     s->state = SSL_ST_CONNECT | SSL_ST_BEFORE;
2812     s->handshake_func = s->method->ssl_connect;
2813     /* clear the current cipher */
2814     ssl_clear_cipher_ctx(s);
2815     ssl_clear_hash_ctx(&s->read_hash);
2816     ssl_clear_hash_ctx(&s->write_hash);
2817 }
2818 
2819 int ssl_undefined_function(SSL *s)
2820 {
2821     SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2822     return (0);
2823 }
2824 
2825 int ssl_undefined_void_function(void)
2826 {
2827     SSLerr(SSL_F_SSL_UNDEFINED_VOID_FUNCTION,
2828            ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2829     return (0);
2830 }
2831 
2832 int ssl_undefined_const_function(const SSL *s)
2833 {
2834     SSLerr(SSL_F_SSL_UNDEFINED_CONST_FUNCTION,
2835            ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2836     return (0);
2837 }
2838 
2839 SSL_METHOD *ssl_bad_method(int ver)
2840 {
2841     SSLerr(SSL_F_SSL_BAD_METHOD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
2842     return (NULL);
2843 }
2844 
2845 const char *SSL_get_version(const SSL *s)
2846 {
2847     if (s->version == TLS1_2_VERSION)
2848         return ("TLSv1.2");
2849     else if (s->version == TLS1_1_VERSION)
2850         return ("TLSv1.1");
2851     else if (s->version == TLS1_VERSION)
2852         return ("TLSv1");
2853     else if (s->version == SSL3_VERSION)
2854         return ("SSLv3");
2855     else if (s->version == SSL2_VERSION)
2856         return ("SSLv2");
2857     else if (s->version == DTLS1_BAD_VER)
2858         return ("DTLSv0.9");
2859     else if (s->version == DTLS1_VERSION)
2860         return ("DTLSv1");
2861     else if (s->version == DTLS1_2_VERSION)
2862         return ("DTLSv1.2");
2863     else
2864         return ("unknown");
2865 }
2866 
2867 SSL *SSL_dup(SSL *s)
2868 {
2869     STACK_OF(X509_NAME) *sk;
2870     X509_NAME *xn;
2871     SSL *ret;
2872     int i;
2873 
2874     if ((ret = SSL_new(SSL_get_SSL_CTX(s))) == NULL)
2875         return (NULL);
2876 
2877     ret->version = s->version;
2878     ret->type = s->type;
2879     ret->method = s->method;
2880 
2881     if (s->session != NULL) {
2882         /* This copies session-id, SSL_METHOD, sid_ctx, and 'cert' */
2883         SSL_copy_session_id(ret, s);
2884     } else {
2885         /*
2886          * No session has been established yet, so we have to expect that
2887          * s->cert or ret->cert will be changed later -- they should not both
2888          * point to the same object, and thus we can't use
2889          * SSL_copy_session_id.
2890          */
2891 
2892         ret->method->ssl_free(ret);
2893         ret->method = s->method;
2894         ret->method->ssl_new(ret);
2895 
2896         if (s->cert != NULL) {
2897             if (ret->cert != NULL) {
2898                 ssl_cert_free(ret->cert);
2899             }
2900             ret->cert = ssl_cert_dup(s->cert);
2901             if (ret->cert == NULL)
2902                 goto err;
2903         }
2904 
2905         SSL_set_session_id_context(ret, s->sid_ctx, s->sid_ctx_length);
2906     }
2907 
2908     ret->options = s->options;
2909     ret->mode = s->mode;
2910     SSL_set_max_cert_list(ret, SSL_get_max_cert_list(s));
2911     SSL_set_read_ahead(ret, SSL_get_read_ahead(s));
2912     ret->msg_callback = s->msg_callback;
2913     ret->msg_callback_arg = s->msg_callback_arg;
2914     SSL_set_verify(ret, SSL_get_verify_mode(s), SSL_get_verify_callback(s));
2915     SSL_set_verify_depth(ret, SSL_get_verify_depth(s));
2916     ret->generate_session_id = s->generate_session_id;
2917 
2918     SSL_set_info_callback(ret, SSL_get_info_callback(s));
2919 
2920     ret->debug = s->debug;
2921 
2922     /* copy app data, a little dangerous perhaps */
2923     if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL, &ret->ex_data, &s->ex_data))
2924         goto err;
2925 
2926     /* setup rbio, and wbio */
2927     if (s->rbio != NULL) {
2928         if (!BIO_dup_state(s->rbio, (char *)&ret->rbio))
2929             goto err;
2930     }
2931     if (s->wbio != NULL) {
2932         if (s->wbio != s->rbio) {
2933             if (!BIO_dup_state(s->wbio, (char *)&ret->wbio))
2934                 goto err;
2935         } else
2936             ret->wbio = ret->rbio;
2937     }
2938     ret->rwstate = s->rwstate;
2939     ret->in_handshake = s->in_handshake;
2940     ret->handshake_func = s->handshake_func;
2941     ret->server = s->server;
2942     ret->renegotiate = s->renegotiate;
2943     ret->new_session = s->new_session;
2944     ret->quiet_shutdown = s->quiet_shutdown;
2945     ret->shutdown = s->shutdown;
2946     ret->state = s->state;      /* SSL_dup does not really work at any state,
2947                                  * though */
2948     ret->rstate = s->rstate;
2949     ret->init_num = 0;          /* would have to copy ret->init_buf,
2950                                  * ret->init_msg, ret->init_num,
2951                                  * ret->init_off */
2952     ret->hit = s->hit;
2953 
2954     X509_VERIFY_PARAM_inherit(ret->param, s->param);
2955 
2956     /* dup the cipher_list and cipher_list_by_id stacks */
2957     if (s->cipher_list != NULL) {
2958         if ((ret->cipher_list = sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
2959             goto err;
2960     }
2961     if (s->cipher_list_by_id != NULL)
2962         if ((ret->cipher_list_by_id = sk_SSL_CIPHER_dup(s->cipher_list_by_id))
2963             == NULL)
2964             goto err;
2965 
2966     /* Dup the client_CA list */
2967     if (s->client_CA != NULL) {
2968         if ((sk = sk_X509_NAME_dup(s->client_CA)) == NULL)
2969             goto err;
2970         ret->client_CA = sk;
2971         for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2972             xn = sk_X509_NAME_value(sk, i);
2973             if (sk_X509_NAME_set(sk, i, X509_NAME_dup(xn)) == NULL) {
2974                 X509_NAME_free(xn);
2975                 goto err;
2976             }
2977         }
2978     }
2979 
2980     if (0) {
2981  err:
2982         if (ret != NULL)
2983             SSL_free(ret);
2984         ret = NULL;
2985     }
2986     return (ret);
2987 }
2988 
2989 void ssl_clear_cipher_ctx(SSL *s)
2990 {
2991     if (s->enc_read_ctx != NULL) {
2992         EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
2993         OPENSSL_free(s->enc_read_ctx);
2994         s->enc_read_ctx = NULL;
2995     }
2996     if (s->enc_write_ctx != NULL) {
2997         EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
2998         OPENSSL_free(s->enc_write_ctx);
2999         s->enc_write_ctx = NULL;
3000     }
3001 #ifndef OPENSSL_NO_COMP
3002     if (s->expand != NULL) {
3003         COMP_CTX_free(s->expand);
3004         s->expand = NULL;
3005     }
3006     if (s->compress != NULL) {
3007         COMP_CTX_free(s->compress);
3008         s->compress = NULL;
3009     }
3010 #endif
3011 }
3012 
3013 X509 *SSL_get_certificate(const SSL *s)
3014 {
3015     if (s->cert != NULL)
3016         return (s->cert->key->x509);
3017     else
3018         return (NULL);
3019 }
3020 
3021 EVP_PKEY *SSL_get_privatekey(const SSL *s)
3022 {
3023     if (s->cert != NULL)
3024         return (s->cert->key->privatekey);
3025     else
3026         return (NULL);
3027 }
3028 
3029 X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx)
3030 {
3031     if (ctx->cert != NULL)
3032         return ctx->cert->key->x509;
3033     else
3034         return NULL;
3035 }
3036 
3037 EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx)
3038 {
3039     if (ctx->cert != NULL)
3040         return ctx->cert->key->privatekey;
3041     else
3042         return NULL;
3043 }
3044 
3045 const SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
3046 {
3047     if ((s->session != NULL) && (s->session->cipher != NULL))
3048         return (s->session->cipher);
3049     return (NULL);
3050 }
3051 
3052 #ifdef OPENSSL_NO_COMP
3053 const COMP_METHOD *SSL_get_current_compression(SSL *s)
3054 {
3055     return NULL;
3056 }
3057 
3058 const COMP_METHOD *SSL_get_current_expansion(SSL *s)
3059 {
3060     return NULL;
3061 }
3062 #else
3063 
3064 const COMP_METHOD *SSL_get_current_compression(SSL *s)
3065 {
3066     if (s->compress != NULL)
3067         return (s->compress->meth);
3068     return (NULL);
3069 }
3070 
3071 const COMP_METHOD *SSL_get_current_expansion(SSL *s)
3072 {
3073     if (s->expand != NULL)
3074         return (s->expand->meth);
3075     return (NULL);
3076 }
3077 #endif
3078 
3079 int ssl_init_wbio_buffer(SSL *s, int push)
3080 {
3081     BIO *bbio;
3082 
3083     if (s->bbio == NULL) {
3084         bbio = BIO_new(BIO_f_buffer());
3085         if (bbio == NULL)
3086             return (0);
3087         s->bbio = bbio;
3088     } else {
3089         bbio = s->bbio;
3090         if (s->bbio == s->wbio)
3091             s->wbio = BIO_pop(s->wbio);
3092     }
3093     (void)BIO_reset(bbio);
3094 /*      if (!BIO_set_write_buffer_size(bbio,16*1024)) */
3095     if (!BIO_set_read_buffer_size(bbio, 1)) {
3096         SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER, ERR_R_BUF_LIB);
3097         return (0);
3098     }
3099     if (push) {
3100         if (s->wbio != bbio)
3101             s->wbio = BIO_push(bbio, s->wbio);
3102     } else {
3103         if (s->wbio == bbio)
3104             s->wbio = BIO_pop(bbio);
3105     }
3106     return (1);
3107 }
3108 
3109 void ssl_free_wbio_buffer(SSL *s)
3110 {
3111     if (s->bbio == NULL)
3112         return;
3113 
3114     if (s->bbio == s->wbio) {
3115         /* remove buffering */
3116         s->wbio = BIO_pop(s->wbio);
3117 #ifdef REF_CHECK                /* not the usual REF_CHECK, but this avoids
3118                                  * adding one more preprocessor symbol */
3119         assert(s->wbio != NULL);
3120 #endif
3121     }
3122     BIO_free(s->bbio);
3123     s->bbio = NULL;
3124 }
3125 
3126 void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode)
3127 {
3128     ctx->quiet_shutdown = mode;
3129 }
3130 
3131 int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx)
3132 {
3133     return (ctx->quiet_shutdown);
3134 }
3135 
3136 void SSL_set_quiet_shutdown(SSL *s, int mode)
3137 {
3138     s->quiet_shutdown = mode;
3139 }
3140 
3141 int SSL_get_quiet_shutdown(const SSL *s)
3142 {
3143     return (s->quiet_shutdown);
3144 }
3145 
3146 void SSL_set_shutdown(SSL *s, int mode)
3147 {
3148     s->shutdown = mode;
3149 }
3150 
3151 int SSL_get_shutdown(const SSL *s)
3152 {
3153     return (s->shutdown);
3154 }
3155 
3156 int SSL_version(const SSL *s)
3157 {
3158     return (s->version);
3159 }
3160 
3161 SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
3162 {
3163     return (ssl->ctx);
3164 }
3165 
3166 SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx)
3167 {
3168     CERT *ocert = ssl->cert;
3169     if (ssl->ctx == ctx)
3170         return ssl->ctx;
3171 #ifndef OPENSSL_NO_TLSEXT
3172     if (ctx == NULL)
3173         ctx = ssl->initial_ctx;
3174 #endif
3175     ssl->cert = ssl_cert_dup(ctx->cert);
3176     if (ocert) {
3177         /* Preserve any already negotiated parameters */
3178         if (ssl->server) {
3179             ssl->cert->peer_sigalgs = ocert->peer_sigalgs;
3180             ssl->cert->peer_sigalgslen = ocert->peer_sigalgslen;
3181             ocert->peer_sigalgs = NULL;
3182             ssl->cert->ciphers_raw = ocert->ciphers_raw;
3183             ssl->cert->ciphers_rawlen = ocert->ciphers_rawlen;
3184             ocert->ciphers_raw = NULL;
3185         }
3186 #ifndef OPENSSL_NO_TLSEXT
3187         ssl->cert->alpn_proposed = ocert->alpn_proposed;
3188         ssl->cert->alpn_proposed_len = ocert->alpn_proposed_len;
3189         ocert->alpn_proposed = NULL;
3190         ssl->cert->alpn_sent = ocert->alpn_sent;
3191 #endif
3192         ssl_cert_free(ocert);
3193     }
3194 
3195     /*
3196      * Program invariant: |sid_ctx| has fixed size (SSL_MAX_SID_CTX_LENGTH),
3197      * so setter APIs must prevent invalid lengths from entering the system.
3198      */
3199     OPENSSL_assert(ssl->sid_ctx_length <= sizeof(ssl->sid_ctx));
3200 
3201     /*
3202      * If the session ID context matches that of the parent SSL_CTX,
3203      * inherit it from the new SSL_CTX as well. If however the context does
3204      * not match (i.e., it was set per-ssl with SSL_set_session_id_context),
3205      * leave it unchanged.
3206      */
3207     if ((ssl->ctx != NULL) &&
3208         (ssl->sid_ctx_length == ssl->ctx->sid_ctx_length) &&
3209         (memcmp(ssl->sid_ctx, ssl->ctx->sid_ctx, ssl->sid_ctx_length) == 0)) {
3210         ssl->sid_ctx_length = ctx->sid_ctx_length;
3211         memcpy(&ssl->sid_ctx, &ctx->sid_ctx, sizeof(ssl->sid_ctx));
3212     }
3213 
3214     CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX);
3215     if (ssl->ctx != NULL)
3216         SSL_CTX_free(ssl->ctx); /* decrement reference count */
3217     ssl->ctx = ctx;
3218 
3219     return (ssl->ctx);
3220 }
3221 
3222 #ifndef OPENSSL_NO_STDIO
3223 int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
3224 {
3225     return (X509_STORE_set_default_paths(ctx->cert_store));
3226 }
3227 
3228 int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
3229                                   const char *CApath)
3230 {
3231     return (X509_STORE_load_locations(ctx->cert_store, CAfile, CApath));
3232 }
3233 #endif
3234 
3235 void SSL_set_info_callback(SSL *ssl,
3236                            void (*cb) (const SSL *ssl, int type, int val))
3237 {
3238     ssl->info_callback = cb;
3239 }
3240 
3241 /*
3242  * One compiler (Diab DCC) doesn't like argument names in returned function
3243  * pointer.
3244  */
3245 void (*SSL_get_info_callback(const SSL *ssl)) (const SSL * /* ssl */ ,
3246                                                int /* type */ ,
3247                                                int /* val */ ) {
3248     return ssl->info_callback;
3249 }
3250 
3251 int SSL_state(const SSL *ssl)
3252 {
3253     return (ssl->state);
3254 }
3255 
3256 void SSL_set_state(SSL *ssl, int state)
3257 {
3258     ssl->state = state;
3259 }
3260 
3261 void SSL_set_verify_result(SSL *ssl, long arg)
3262 {
3263     ssl->verify_result = arg;
3264 }
3265 
3266 long SSL_get_verify_result(const SSL *ssl)
3267 {
3268     return (ssl->verify_result);
3269 }
3270 
3271 int SSL_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
3272                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
3273 {
3274     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL, argl, argp,
3275                                    new_func, dup_func, free_func);
3276 }
3277 
3278 int SSL_set_ex_data(SSL *s, int idx, void *arg)
3279 {
3280     return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
3281 }
3282 
3283 void *SSL_get_ex_data(const SSL *s, int idx)
3284 {
3285     return (CRYPTO_get_ex_data(&s->ex_data, idx));
3286 }
3287 
3288 int SSL_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
3289                              CRYPTO_EX_dup *dup_func,
3290                              CRYPTO_EX_free *free_func)
3291 {
3292     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_CTX, argl, argp,
3293                                    new_func, dup_func, free_func);
3294 }
3295 
3296 int SSL_CTX_set_ex_data(SSL_CTX *s, int idx, void *arg)
3297 {
3298     return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
3299 }
3300 
3301 void *SSL_CTX_get_ex_data(const SSL_CTX *s, int idx)
3302 {
3303     return (CRYPTO_get_ex_data(&s->ex_data, idx));
3304 }
3305 
3306 int ssl_ok(SSL *s)
3307 {
3308     return (1);
3309 }
3310 
3311 X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx)
3312 {
3313     return (ctx->cert_store);
3314 }
3315 
3316 void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store)
3317 {
3318     if (ctx->cert_store != NULL)
3319         X509_STORE_free(ctx->cert_store);
3320     ctx->cert_store = store;
3321 }
3322 
3323 int SSL_want(const SSL *s)
3324 {
3325     return (s->rwstate);
3326 }
3327 
3328 /**
3329  * \brief Set the callback for generating temporary RSA keys.
3330  * \param ctx the SSL context.
3331  * \param cb the callback
3332  */
3333 
3334 #ifndef OPENSSL_NO_RSA
3335 void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx, RSA *(*cb) (SSL *ssl,
3336                                                             int is_export,
3337                                                             int keylength))
3338 {
3339     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_RSA_CB, (void (*)(void))cb);
3340 }
3341 
3342 void SSL_set_tmp_rsa_callback(SSL *ssl, RSA *(*cb) (SSL *ssl,
3343                                                     int is_export,
3344                                                     int keylength))
3345 {
3346     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_RSA_CB, (void (*)(void))cb);
3347 }
3348 #endif
3349 
3350 #ifdef DOXYGEN
3351 /**
3352  * \brief The RSA temporary key callback function.
3353  * \param ssl the SSL session.
3354  * \param is_export \c TRUE if the temp RSA key is for an export ciphersuite.
3355  * \param keylength if \c is_export is \c TRUE, then \c keylength is the size
3356  * of the required key in bits.
3357  * \return the temporary RSA key.
3358  * \sa SSL_CTX_set_tmp_rsa_callback, SSL_set_tmp_rsa_callback
3359  */
3360 
3361 RSA *cb(SSL *ssl, int is_export, int keylength)
3362 {
3363 }
3364 #endif
3365 
3366 /**
3367  * \brief Set the callback for generating temporary DH keys.
3368  * \param ctx the SSL context.
3369  * \param dh the callback
3370  */
3371 
3372 #ifndef OPENSSL_NO_DH
3373 void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,
3374                                  DH *(*dh) (SSL *ssl, int is_export,
3375                                             int keylength))
3376 {
3377     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
3378 }
3379 
3380 void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,
3381                                                   int keylength))
3382 {
3383     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
3384 }
3385 #endif
3386 
3387 #ifndef OPENSSL_NO_ECDH
3388 void SSL_CTX_set_tmp_ecdh_callback(SSL_CTX *ctx,
3389                                    EC_KEY *(*ecdh) (SSL *ssl, int is_export,
3390                                                     int keylength))
3391 {
3392     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_ECDH_CB,
3393                           (void (*)(void))ecdh);
3394 }
3395 
3396 void SSL_set_tmp_ecdh_callback(SSL *ssl,
3397                                EC_KEY *(*ecdh) (SSL *ssl, int is_export,
3398                                                 int keylength))
3399 {
3400     SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_ECDH_CB, (void (*)(void))ecdh);
3401 }
3402 #endif
3403 
3404 #ifndef OPENSSL_NO_PSK
3405 int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
3406 {
3407     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
3408         SSLerr(SSL_F_SSL_CTX_USE_PSK_IDENTITY_HINT,
3409                SSL_R_DATA_LENGTH_TOO_LONG);
3410         return 0;
3411     }
3412     if (ctx->psk_identity_hint != NULL)
3413         OPENSSL_free(ctx->psk_identity_hint);
3414     if (identity_hint != NULL) {
3415         ctx->psk_identity_hint = BUF_strdup(identity_hint);
3416         if (ctx->psk_identity_hint == NULL)
3417             return 0;
3418     } else
3419         ctx->psk_identity_hint = NULL;
3420     return 1;
3421 }
3422 
3423 int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint)
3424 {
3425     if (s == NULL)
3426         return 0;
3427 
3428     if (s->session == NULL)
3429         return 1;               /* session not created yet, ignored */
3430 
3431     if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
3432         SSLerr(SSL_F_SSL_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
3433         return 0;
3434     }
3435     if (s->session->psk_identity_hint != NULL)
3436         OPENSSL_free(s->session->psk_identity_hint);
3437     if (identity_hint != NULL) {
3438         s->session->psk_identity_hint = BUF_strdup(identity_hint);
3439         if (s->session->psk_identity_hint == NULL)
3440             return 0;
3441     } else
3442         s->session->psk_identity_hint = NULL;
3443     return 1;
3444 }
3445 
3446 const char *SSL_get_psk_identity_hint(const SSL *s)
3447 {
3448     if (s == NULL || s->session == NULL)
3449         return NULL;
3450     return (s->session->psk_identity_hint);
3451 }
3452 
3453 const char *SSL_get_psk_identity(const SSL *s)
3454 {
3455     if (s == NULL || s->session == NULL)
3456         return NULL;
3457     return (s->session->psk_identity);
3458 }
3459 
3460 void SSL_set_psk_client_callback(SSL *s,
3461                                  unsigned int (*cb) (SSL *ssl,
3462                                                      const char *hint,
3463                                                      char *identity,
3464                                                      unsigned int
3465                                                      max_identity_len,
3466                                                      unsigned char *psk,
3467                                                      unsigned int
3468                                                      max_psk_len))
3469 {
3470     s->psk_client_callback = cb;
3471 }
3472 
3473 void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
3474                                      unsigned int (*cb) (SSL *ssl,
3475                                                          const char *hint,
3476                                                          char *identity,
3477                                                          unsigned int
3478                                                          max_identity_len,
3479                                                          unsigned char *psk,
3480                                                          unsigned int
3481                                                          max_psk_len))
3482 {
3483     ctx->psk_client_callback = cb;
3484 }
3485 
3486 void SSL_set_psk_server_callback(SSL *s,
3487                                  unsigned int (*cb) (SSL *ssl,
3488                                                      const char *identity,
3489                                                      unsigned char *psk,
3490                                                      unsigned int
3491                                                      max_psk_len))
3492 {
3493     s->psk_server_callback = cb;
3494 }
3495 
3496 void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx,
3497                                      unsigned int (*cb) (SSL *ssl,
3498                                                          const char *identity,
3499                                                          unsigned char *psk,
3500                                                          unsigned int
3501                                                          max_psk_len))
3502 {
3503     ctx->psk_server_callback = cb;
3504 }
3505 #endif
3506 
3507 void SSL_CTX_set_msg_callback(SSL_CTX *ctx,
3508                               void (*cb) (int write_p, int version,
3509                                           int content_type, const void *buf,
3510                                           size_t len, SSL *ssl, void *arg))
3511 {
3512     SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
3513 }
3514 
3515 void SSL_set_msg_callback(SSL *ssl,
3516                           void (*cb) (int write_p, int version,
3517                                       int content_type, const void *buf,
3518                                       size_t len, SSL *ssl, void *arg))
3519 {
3520     SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
3521 }
3522 
3523 /*
3524  * Allocates new EVP_MD_CTX and sets pointer to it into given pointer
3525  * vairable, freeing EVP_MD_CTX previously stored in that variable, if any.
3526  * If EVP_MD pointer is passed, initializes ctx with this md Returns newly
3527  * allocated ctx;
3528  */
3529 
3530 EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md)
3531 {
3532     ssl_clear_hash_ctx(hash);
3533     *hash = EVP_MD_CTX_create();
3534     if (*hash == NULL || (md && EVP_DigestInit_ex(*hash, md, NULL) <= 0)) {
3535         EVP_MD_CTX_destroy(*hash);
3536         *hash = NULL;
3537         return NULL;
3538     }
3539     return *hash;
3540 }
3541 
3542 void ssl_clear_hash_ctx(EVP_MD_CTX **hash)
3543 {
3544 
3545     if (*hash)
3546         EVP_MD_CTX_destroy(*hash);
3547     *hash = NULL;
3548 }
3549 
3550 void SSL_set_debug(SSL *s, int debug)
3551 {
3552     s->debug = debug;
3553 }
3554 
3555 int SSL_cache_hit(SSL *s)
3556 {
3557     return s->hit;
3558 }
3559 
3560 int SSL_is_server(SSL *s)
3561 {
3562     return s->server;
3563 }
3564 
3565 #if defined(_WINDLL) && defined(OPENSSL_SYS_WIN16)
3566 # include "../crypto/bio/bss_file.c"
3567 #endif
3568 
3569 IMPLEMENT_STACK_OF(SSL_CIPHER)
3570 IMPLEMENT_STACK_OF(SSL_COMP)
3571 IMPLEMENT_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id);
3572