Set security level to zero is ssltest
[openssl.git] / ssl / ssl_cert.c
1 /*! \file ssl/ssl_cert.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by 
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116
117 #include <stdio.h>
118
119 #include "e_os.h"
120 #ifndef NO_SYS_TYPES_H
121 # include <sys/types.h>
122 #endif
123
124 #include "o_dir.h"
125 #include <openssl/objects.h>
126 #include <openssl/bio.h>
127 #include <openssl/pem.h>
128 #include <openssl/x509v3.h>
129 #ifndef OPENSSL_NO_DH
130 #include <openssl/dh.h>
131 #endif
132 #include <openssl/bn.h>
133 #include "ssl_locl.h"
134
135 static int ssl_security_default_callback(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex);
136
137 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
138         {
139         static volatile int ssl_x509_store_ctx_idx= -1;
140         int got_write_lock = 0;
141
142         CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
143
144         if (ssl_x509_store_ctx_idx < 0)
145                 {
146                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
147                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
148                 got_write_lock = 1;
149                 
150                 if (ssl_x509_store_ctx_idx < 0)
151                         {
152                         ssl_x509_store_ctx_idx=X509_STORE_CTX_get_ex_new_index(
153                                 0,"SSL for verify callback",NULL,NULL,NULL);
154                         }
155                 }
156
157         if (got_write_lock)
158                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
159         else
160                 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
161         
162         return ssl_x509_store_ctx_idx;
163         }
164
165 void ssl_cert_set_default_md(CERT *cert)
166         {
167         /* Set digest values to defaults */
168 #ifndef OPENSSL_NO_DSA
169         cert->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
170 #endif
171 #ifndef OPENSSL_NO_RSA
172         cert->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
173         cert->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
174 #endif
175 #ifndef OPENSSL_NO_ECDSA
176         cert->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
177 #endif
178         }
179
180 CERT *ssl_cert_new(void)
181         {
182         CERT *ret;
183
184         ret=(CERT *)OPENSSL_malloc(sizeof(CERT));
185         if (ret == NULL)
186                 {
187                 SSLerr(SSL_F_SSL_CERT_NEW,ERR_R_MALLOC_FAILURE);
188                 return(NULL);
189                 }
190         memset(ret,0,sizeof(CERT));
191
192         ret->key= &(ret->pkeys[SSL_PKEY_RSA_ENC]);
193         ret->references=1;
194         ssl_cert_set_default_md(ret);
195         ret->sec_cb = ssl_security_default_callback;
196         ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
197         ret->sec_ex = NULL;
198         return(ret);
199         }
200
201 CERT *ssl_cert_dup(CERT *cert)
202         {
203         CERT *ret;
204         int i;
205
206         ret = (CERT *)OPENSSL_malloc(sizeof(CERT));
207         if (ret == NULL)
208                 {
209                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
210                 return(NULL);
211                 }
212
213         memset(ret, 0, sizeof(CERT));
214
215         ret->key = &ret->pkeys[cert->key - &cert->pkeys[0]];
216         /* or ret->key = ret->pkeys + (cert->key - cert->pkeys),
217          * if you find that more readable */
218
219         ret->valid = cert->valid;
220         ret->mask_k = cert->mask_k;
221         ret->mask_a = cert->mask_a;
222         ret->export_mask_k = cert->export_mask_k;
223         ret->export_mask_a = cert->export_mask_a;
224
225 #ifndef OPENSSL_NO_RSA
226         if (cert->rsa_tmp != NULL)
227                 {
228                 RSA_up_ref(cert->rsa_tmp);
229                 ret->rsa_tmp = cert->rsa_tmp;
230                 }
231         ret->rsa_tmp_cb = cert->rsa_tmp_cb;
232 #endif
233
234 #ifndef OPENSSL_NO_DH
235         if (cert->dh_tmp != NULL)
236                 {
237                 ret->dh_tmp = DHparams_dup(cert->dh_tmp);
238                 if (ret->dh_tmp == NULL)
239                         {
240                         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_DH_LIB);
241                         goto err;
242                         }
243                 if (cert->dh_tmp->priv_key)
244                         {
245                         BIGNUM *b = BN_dup(cert->dh_tmp->priv_key);
246                         if (!b)
247                                 {
248                                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_BN_LIB);
249                                 goto err;
250                                 }
251                         ret->dh_tmp->priv_key = b;
252                         }
253                 if (cert->dh_tmp->pub_key)
254                         {
255                         BIGNUM *b = BN_dup(cert->dh_tmp->pub_key);
256                         if (!b)
257                                 {
258                                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_BN_LIB);
259                                 goto err;
260                                 }
261                         ret->dh_tmp->pub_key = b;
262                         }
263                 }
264         ret->dh_tmp_cb = cert->dh_tmp_cb;
265         ret->dh_tmp_auto = cert->dh_tmp_auto;
266 #endif
267
268 #ifndef OPENSSL_NO_ECDH
269         if (cert->ecdh_tmp)
270                 {
271                 ret->ecdh_tmp = EC_KEY_dup(cert->ecdh_tmp);
272                 if (ret->ecdh_tmp == NULL)
273                         {
274                         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_EC_LIB);
275                         goto err;
276                         }
277                 }
278         ret->ecdh_tmp_cb = cert->ecdh_tmp_cb;
279         ret->ecdh_tmp_auto = cert->ecdh_tmp_auto;
280 #endif
281
282         for (i = 0; i < SSL_PKEY_NUM; i++)
283                 {
284                 CERT_PKEY *cpk = cert->pkeys + i;
285                 CERT_PKEY *rpk = ret->pkeys + i;
286                 if (cpk->x509 != NULL)
287                         {
288                         rpk->x509 = cpk->x509;
289                         CRYPTO_add(&rpk->x509->references, 1, CRYPTO_LOCK_X509);
290                         }
291                 
292                 if (cpk->privatekey != NULL)
293                         {
294                         rpk->privatekey = cpk->privatekey;
295                         CRYPTO_add(&cpk->privatekey->references, 1,
296                                 CRYPTO_LOCK_EVP_PKEY);
297
298                         switch(i) 
299                                 {
300                                 /* If there was anything special to do for
301                                  * certain types of keys, we'd do it here.
302                                  * (Nothing at the moment, I think.) */
303
304                         case SSL_PKEY_RSA_ENC:
305                         case SSL_PKEY_RSA_SIGN:
306                                 /* We have an RSA key. */
307                                 break;
308                                 
309                         case SSL_PKEY_DSA_SIGN:
310                                 /* We have a DSA key. */
311                                 break;
312                                 
313                         case SSL_PKEY_DH_RSA:
314                         case SSL_PKEY_DH_DSA:
315                                 /* We have a DH key. */
316                                 break;
317
318                         case SSL_PKEY_ECC:
319                                 /* We have an ECC key */
320                                 break;
321
322                         default:
323                                 /* Can't happen. */
324                                 SSLerr(SSL_F_SSL_CERT_DUP, SSL_R_LIBRARY_BUG);
325                                 }
326                         }
327
328                 if (cpk->chain)
329                         {
330                         rpk->chain = X509_chain_up_ref(cpk->chain);
331                         if (!rpk->chain)
332                                 {
333                                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
334                                 goto err;
335                                 }
336                         }
337                 rpk->valid_flags = 0;
338 #ifndef OPENSSL_NO_TLSEXT
339                 if (cert->pkeys[i].serverinfo != NULL)
340                         {
341                         /* Just copy everything. */
342                         ret->pkeys[i].serverinfo =
343                                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
344                         if (ret->pkeys[i].serverinfo == NULL)
345                                 {
346                                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
347                                 return NULL;
348                                 }
349                         ret->pkeys[i].serverinfo_length =
350                                 cert->pkeys[i].serverinfo_length;
351                         memcpy(ret->pkeys[i].serverinfo,
352                                cert->pkeys[i].serverinfo,
353                                cert->pkeys[i].serverinfo_length);
354                         }
355 #endif
356                 }
357         
358         ret->references=1;
359         /* Set digests to defaults. NB: we don't copy existing values as they
360          * will be set during handshake.
361          */
362         ssl_cert_set_default_md(ret);
363         /* Peer sigalgs set to NULL as we get these from handshake too */
364         ret->peer_sigalgs = NULL;
365         ret->peer_sigalgslen = 0;
366         /* Configured sigalgs however we copy across */
367
368         if (cert->conf_sigalgs)
369                 {
370                 ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen);
371                 if (!ret->conf_sigalgs)
372                         goto err;
373                 memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
374                                                 cert->conf_sigalgslen);
375                 ret->conf_sigalgslen = cert->conf_sigalgslen;
376                 }
377         else
378                 ret->conf_sigalgs = NULL;
379
380         if (cert->client_sigalgs)
381                 {
382                 ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen);
383                 if (!ret->client_sigalgs)
384                         goto err;
385                 memcpy(ret->client_sigalgs, cert->client_sigalgs,
386                                                 cert->client_sigalgslen);
387                 ret->client_sigalgslen = cert->client_sigalgslen;
388                 }
389         else
390                 ret->client_sigalgs = NULL;
391         /* Shared sigalgs also NULL */
392         ret->shared_sigalgs = NULL;
393         /* Copy any custom client certificate types */
394         if (cert->ctypes)
395                 {
396                 ret->ctypes = OPENSSL_malloc(cert->ctype_num);
397                 if (!ret->ctypes)
398                         goto err;
399                 memcpy(ret->ctypes, cert->ctypes, cert->ctype_num);
400                 ret->ctype_num = cert->ctype_num;
401                 }
402
403         ret->cert_flags = cert->cert_flags;
404
405         ret->cert_cb = cert->cert_cb;
406         ret->cert_cb_arg = cert->cert_cb_arg;
407
408         if (cert->verify_store)
409                 {
410                 CRYPTO_add(&cert->verify_store->references, 1, CRYPTO_LOCK_X509_STORE);
411                 ret->verify_store = cert->verify_store;
412                 }
413
414         if (cert->chain_store)
415                 {
416                 CRYPTO_add(&cert->chain_store->references, 1, CRYPTO_LOCK_X509_STORE);
417                 ret->chain_store = cert->chain_store;
418                 }
419
420         ret->ciphers_raw = NULL;
421
422         ret->sec_cb = cert->sec_cb;
423         ret->sec_level = cert->sec_level;
424         ret->sec_ex = cert->sec_ex;
425
426         return(ret);
427         
428 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_ECDH)
429 err:
430 #endif
431 #ifndef OPENSSL_NO_RSA
432         if (ret->rsa_tmp != NULL)
433                 RSA_free(ret->rsa_tmp);
434 #endif
435 #ifndef OPENSSL_NO_DH
436         if (ret->dh_tmp != NULL)
437                 DH_free(ret->dh_tmp);
438 #endif
439 #ifndef OPENSSL_NO_ECDH
440         if (ret->ecdh_tmp != NULL)
441                 EC_KEY_free(ret->ecdh_tmp);
442 #endif
443
444         ssl_cert_clear_certs(ret);
445
446         return NULL;
447         }
448
449 /* Free up and clear all certificates and chains */
450
451 void ssl_cert_clear_certs(CERT *c)
452         {
453         int i;
454         if (c == NULL)
455                 return;
456         for (i = 0; i<SSL_PKEY_NUM; i++)
457                 {
458                 CERT_PKEY *cpk = c->pkeys + i;
459                 if (cpk->x509)
460                         {
461                         X509_free(cpk->x509);
462                         cpk->x509 = NULL;
463                         }
464                 if (cpk->privatekey)
465                         {
466                         EVP_PKEY_free(cpk->privatekey);
467                         cpk->privatekey = NULL;
468                         }
469                 if (cpk->chain)
470                         {
471                         sk_X509_pop_free(cpk->chain, X509_free);
472                         cpk->chain = NULL;
473                         }
474 #ifndef OPENSSL_NO_TLSEXT
475                 if (cpk->serverinfo)
476                         {
477                         OPENSSL_free(cpk->serverinfo);
478                         cpk->serverinfo = NULL;
479                         cpk->serverinfo_length = 0;
480                         }
481 #endif
482                 /* Clear all flags apart from explicit sign */
483                 cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
484                 }
485         }
486
487 void ssl_cert_free(CERT *c)
488         {
489         int i;
490
491         if(c == NULL)
492             return;
493
494         i=CRYPTO_add(&c->references,-1,CRYPTO_LOCK_SSL_CERT);
495 #ifdef REF_PRINT
496         REF_PRINT("CERT",c);
497 #endif
498         if (i > 0) return;
499 #ifdef REF_CHECK
500         if (i < 0)
501                 {
502                 fprintf(stderr,"ssl_cert_free, bad reference count\n");
503                 abort(); /* ok */
504                 }
505 #endif
506
507 #ifndef OPENSSL_NO_RSA
508         if (c->rsa_tmp) RSA_free(c->rsa_tmp);
509 #endif
510 #ifndef OPENSSL_NO_DH
511         if (c->dh_tmp) DH_free(c->dh_tmp);
512 #endif
513 #ifndef OPENSSL_NO_ECDH
514         if (c->ecdh_tmp) EC_KEY_free(c->ecdh_tmp);
515 #endif
516
517         ssl_cert_clear_certs(c);
518         if (c->peer_sigalgs)
519                 OPENSSL_free(c->peer_sigalgs);
520         if (c->conf_sigalgs)
521                 OPENSSL_free(c->conf_sigalgs);
522         if (c->client_sigalgs)
523                 OPENSSL_free(c->client_sigalgs);
524         if (c->shared_sigalgs)
525                 OPENSSL_free(c->shared_sigalgs);
526         if (c->ctypes)
527                 OPENSSL_free(c->ctypes);
528         if (c->verify_store)
529                 X509_STORE_free(c->verify_store);
530         if (c->chain_store)
531                 X509_STORE_free(c->chain_store);
532         if (c->ciphers_raw)
533                 OPENSSL_free(c->ciphers_raw);
534         OPENSSL_free(c);
535         }
536
537 int ssl_cert_inst(CERT **o)
538         {
539         /* Create a CERT if there isn't already one
540          * (which cannot really happen, as it is initially created in
541          * SSL_CTX_new; but the earlier code usually allows for that one
542          * being non-existant, so we follow that behaviour, as it might
543          * turn out that there actually is a reason for it -- but I'm
544          * not sure that *all* of the existing code could cope with
545          * s->cert being NULL, otherwise we could do without the
546          * initialization in SSL_CTX_new).
547          */
548         
549         if (o == NULL) 
550                 {
551                 SSLerr(SSL_F_SSL_CERT_INST, ERR_R_PASSED_NULL_PARAMETER);
552                 return(0);
553                 }
554         if (*o == NULL)
555                 {
556                 if ((*o = ssl_cert_new()) == NULL)
557                         {
558                         SSLerr(SSL_F_SSL_CERT_INST, ERR_R_MALLOC_FAILURE);
559                         return(0);
560                         }
561                 }
562         return(1);
563         }
564
565 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
566         {
567         int i, r;
568         CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
569         if (!cpk)
570                 return 0;
571         if (cpk->chain)
572                 sk_X509_pop_free(cpk->chain, X509_free);
573         for (i = 0; i < sk_X509_num(chain); i++)
574                 {
575                 r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
576                 if (r != 1)
577                         {
578                         SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
579                         return 0;
580                         }
581                 }
582         cpk->chain = chain;
583         return 1;
584         }
585
586 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
587         {
588         STACK_OF(X509) *dchain;
589         if (!chain)
590                 return ssl_cert_set0_chain(s, ctx, NULL);
591         dchain = X509_chain_up_ref(chain);
592         if (!dchain)
593                 return 0;
594         if (!ssl_cert_set0_chain(s, ctx, dchain))
595                 {
596                 sk_X509_pop_free(dchain, X509_free);
597                 return 0;
598                 }
599         return 1;
600         }
601
602 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
603         {
604         int r;
605         CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
606         if (!cpk)
607                 return 0;
608         r = ssl_security_cert(s, ctx, x, 0, 0);
609         if (r != 1)
610                 {
611                 SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
612                 return 0;
613                 }
614         if (!cpk->chain)
615                 cpk->chain = sk_X509_new_null();
616         if (!cpk->chain || !sk_X509_push(cpk->chain, x))
617                 return 0;
618         return 1;
619         }
620
621 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
622         {
623         if (!ssl_cert_add0_chain_cert(s, ctx, x))
624                 return 0;
625         CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
626         return 1;
627         }
628
629 int ssl_cert_select_current(CERT *c, X509 *x)
630         {
631         int i;
632         if (x == NULL)
633                 return 0;
634         for (i = 0; i < SSL_PKEY_NUM; i++)
635                 {
636                 CERT_PKEY *cpk = c->pkeys + i;
637                 if (cpk->x509 == x && cpk->privatekey)
638                         {
639                         c->key = cpk;
640                         return 1;
641                         }
642                 }
643
644         for (i = 0; i < SSL_PKEY_NUM; i++)
645                 {
646                 CERT_PKEY *cpk = c->pkeys + i;
647                 if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x))
648                         {
649                         c->key = cpk;
650                         return 1;
651                         }
652                 }
653         return 0;
654         }
655
656 int ssl_cert_set_current(CERT *c, long op)
657         {
658         int i, idx;
659         if (!c)
660                 return 0;
661         if (op == SSL_CERT_SET_FIRST)
662                 idx = 0;
663         else if (op == SSL_CERT_SET_NEXT)
664                 {
665                 idx = (int)(c->key - c->pkeys + 1);
666                 if (idx >= SSL_PKEY_NUM)
667                         return 0;
668                 }
669         else
670                 return 0;
671         for (i = idx; i < SSL_PKEY_NUM; i++)
672                 {
673                 CERT_PKEY *cpk = c->key + i;
674                 if (cpk->x509 && cpk->privatekey)
675                         {
676                         c->key = cpk;
677                         return 1;
678                         }
679                 }
680         return 0;
681         }
682
683 void ssl_cert_set_cert_cb(CERT *c, int (*cb)(SSL *ssl, void *arg), void *arg)
684         {
685         c->cert_cb = cb;
686         c->cert_cb_arg = arg;
687         }
688
689 SESS_CERT *ssl_sess_cert_new(void)
690         {
691         SESS_CERT *ret;
692
693         ret = OPENSSL_malloc(sizeof *ret);
694         if (ret == NULL)
695                 {
696                 SSLerr(SSL_F_SSL_SESS_CERT_NEW, ERR_R_MALLOC_FAILURE);
697                 return NULL;
698                 }
699
700         memset(ret, 0 ,sizeof *ret);
701         ret->peer_key = &(ret->peer_pkeys[SSL_PKEY_RSA_ENC]);
702         ret->references = 1;
703
704         return ret;
705         }
706
707 void ssl_sess_cert_free(SESS_CERT *sc)
708         {
709         int i;
710
711         if (sc == NULL)
712                 return;
713
714         i = CRYPTO_add(&sc->references, -1, CRYPTO_LOCK_SSL_SESS_CERT);
715 #ifdef REF_PRINT
716         REF_PRINT("SESS_CERT", sc);
717 #endif
718         if (i > 0)
719                 return;
720 #ifdef REF_CHECK
721         if (i < 0)
722                 {
723                 fprintf(stderr,"ssl_sess_cert_free, bad reference count\n");
724                 abort(); /* ok */
725                 }
726 #endif
727
728         /* i == 0 */
729         if (sc->cert_chain != NULL)
730                 sk_X509_pop_free(sc->cert_chain, X509_free);
731         for (i = 0; i < SSL_PKEY_NUM; i++)
732                 {
733                 if (sc->peer_pkeys[i].x509 != NULL)
734                         X509_free(sc->peer_pkeys[i].x509);
735 #if 0 /* We don't have the peer's private key.  These lines are just
736            * here as a reminder that we're still using a not-quite-appropriate
737            * data structure. */
738                 if (sc->peer_pkeys[i].privatekey != NULL)
739                         EVP_PKEY_free(sc->peer_pkeys[i].privatekey);
740 #endif
741                 }
742
743 #ifndef OPENSSL_NO_RSA
744         if (sc->peer_rsa_tmp != NULL)
745                 RSA_free(sc->peer_rsa_tmp);
746 #endif
747 #ifndef OPENSSL_NO_DH
748         if (sc->peer_dh_tmp != NULL)
749                 DH_free(sc->peer_dh_tmp);
750 #endif
751 #ifndef OPENSSL_NO_ECDH
752         if (sc->peer_ecdh_tmp != NULL)
753                 EC_KEY_free(sc->peer_ecdh_tmp);
754 #endif
755
756         OPENSSL_free(sc);
757         }
758
759 int ssl_set_peer_cert_type(SESS_CERT *sc,int type)
760         {
761         sc->peer_cert_type = type;
762         return(1);
763         }
764
765 int ssl_verify_cert_chain(SSL *s,STACK_OF(X509) *sk)
766         {
767         X509 *x;
768         int i;
769         X509_STORE *verify_store;
770         X509_STORE_CTX ctx;
771
772         if (s->cert->verify_store)
773                 verify_store = s->cert->verify_store;
774         else
775                 verify_store = s->ctx->cert_store;
776
777         if ((sk == NULL) || (sk_X509_num(sk) == 0))
778                 return(0);
779
780         x=sk_X509_value(sk,0);
781         if(!X509_STORE_CTX_init(&ctx,verify_store,x,sk))
782                 {
783                 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,ERR_R_X509_LIB);
784                 return(0);
785                 }
786         /* Set suite B flags if needed */
787         X509_STORE_CTX_set_flags(&ctx, tls1_suiteb(s));
788 #if 0
789         if (SSL_get_verify_depth(s) >= 0)
790                 X509_STORE_CTX_set_depth(&ctx, SSL_get_verify_depth(s));
791 #endif
792         X509_STORE_CTX_set_ex_data(&ctx,SSL_get_ex_data_X509_STORE_CTX_idx(),s);
793
794         /* We need to inherit the verify parameters. These can be determined by
795          * the context: if its a server it will verify SSL client certificates
796          * or vice versa.
797          */
798
799         X509_STORE_CTX_set_default(&ctx,
800                                 s->server ? "ssl_client" : "ssl_server");
801         /* Anything non-default in "param" should overwrite anything in the
802          * ctx.
803          */
804         X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(&ctx), s->param);
805
806         if (s->verify_callback)
807                 X509_STORE_CTX_set_verify_cb(&ctx, s->verify_callback);
808
809         if (s->ctx->app_verify_callback != NULL)
810 #if 1 /* new with OpenSSL 0.9.7 */
811                 i=s->ctx->app_verify_callback(&ctx, s->ctx->app_verify_arg); 
812 #else
813                 i=s->ctx->app_verify_callback(&ctx); /* should pass app_verify_arg */
814 #endif
815         else
816                 {
817 #ifndef OPENSSL_NO_X509_VERIFY
818                 i=X509_verify_cert(&ctx);
819 #if 0
820                 /* Dummy error calls so mkerr generates them */
821                 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,SSL_R_EE_KEY_TOO_SMALL);
822                 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,SSL_R_CA_KEY_TOO_SMALL);
823                 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,SSL_R_CA_MD_TOO_WEAK);
824 #endif
825                 if (i > 0)
826                         i = ssl_security_cert_chain(s, ctx.chain, NULL, 1);
827 #else
828                 i=0;
829                 ctx.error=X509_V_ERR_APPLICATION_VERIFICATION;
830                 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,SSL_R_NO_VERIFY_CALLBACK);
831 #endif
832                 }
833
834         s->verify_result=ctx.error;
835         X509_STORE_CTX_cleanup(&ctx);
836
837         return(i);
838         }
839
840 static void set_client_CA_list(STACK_OF(X509_NAME) **ca_list,STACK_OF(X509_NAME) *name_list)
841         {
842         if (*ca_list != NULL)
843                 sk_X509_NAME_pop_free(*ca_list,X509_NAME_free);
844
845         *ca_list=name_list;
846         }
847
848 STACK_OF(X509_NAME) *SSL_dup_CA_list(STACK_OF(X509_NAME) *sk)
849         {
850         int i;
851         STACK_OF(X509_NAME) *ret;
852         X509_NAME *name;
853
854         ret=sk_X509_NAME_new_null();
855         for (i=0; i<sk_X509_NAME_num(sk); i++)
856                 {
857                 name=X509_NAME_dup(sk_X509_NAME_value(sk,i));
858                 if ((name == NULL) || !sk_X509_NAME_push(ret,name))
859                         {
860                         sk_X509_NAME_pop_free(ret,X509_NAME_free);
861                         return(NULL);
862                         }
863                 }
864         return(ret);
865         }
866
867 void SSL_set_client_CA_list(SSL *s,STACK_OF(X509_NAME) *name_list)
868         {
869         set_client_CA_list(&(s->client_CA),name_list);
870         }
871
872 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx,STACK_OF(X509_NAME) *name_list)
873         {
874         set_client_CA_list(&(ctx->client_CA),name_list);
875         }
876
877 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
878         {
879         return(ctx->client_CA);
880         }
881
882 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
883         {
884         if (s->type == SSL_ST_CONNECT)
885                 { /* we are in the client */
886                 if (((s->version>>8) == SSL3_VERSION_MAJOR) &&
887                         (s->s3 != NULL))
888                         return(s->s3->tmp.ca_names);
889                 else
890                         return(NULL);
891                 }
892         else
893                 {
894                 if (s->client_CA != NULL)
895                         return(s->client_CA);
896                 else
897                         return(s->ctx->client_CA);
898                 }
899         }
900
901 static int add_client_CA(STACK_OF(X509_NAME) **sk,X509 *x)
902         {
903         X509_NAME *name;
904
905         if (x == NULL) return(0);
906         if ((*sk == NULL) && ((*sk=sk_X509_NAME_new_null()) == NULL))
907                 return(0);
908                 
909         if ((name=X509_NAME_dup(X509_get_subject_name(x))) == NULL)
910                 return(0);
911
912         if (!sk_X509_NAME_push(*sk,name))
913                 {
914                 X509_NAME_free(name);
915                 return(0);
916                 }
917         return(1);
918         }
919
920 int SSL_add_client_CA(SSL *ssl,X509 *x)
921         {
922         return(add_client_CA(&(ssl->client_CA),x));
923         }
924
925 int SSL_CTX_add_client_CA(SSL_CTX *ctx,X509 *x)
926         {
927         return(add_client_CA(&(ctx->client_CA),x));
928         }
929
930 static int xname_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
931         {
932         return(X509_NAME_cmp(*a,*b));
933         }
934
935 #ifndef OPENSSL_NO_STDIO
936 /*!
937  * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
938  * it doesn't really have anything to do with clients (except that a common use
939  * for a stack of CAs is to send it to the client). Actually, it doesn't have
940  * much to do with CAs, either, since it will load any old cert.
941  * \param file the file containing one or more certs.
942  * \return a ::STACK containing the certs.
943  */
944 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
945         {
946         BIO *in;
947         X509 *x=NULL;
948         X509_NAME *xn=NULL;
949         STACK_OF(X509_NAME) *ret = NULL,*sk;
950
951         sk=sk_X509_NAME_new(xname_cmp);
952
953         in=BIO_new(BIO_s_file_internal());
954
955         if ((sk == NULL) || (in == NULL))
956                 {
957                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE,ERR_R_MALLOC_FAILURE);
958                 goto err;
959                 }
960         
961         if (!BIO_read_filename(in,file))
962                 goto err;
963
964         for (;;)
965                 {
966                 if (PEM_read_bio_X509(in,&x,NULL,NULL) == NULL)
967                         break;
968                 if (ret == NULL)
969                         {
970                         ret = sk_X509_NAME_new_null();
971                         if (ret == NULL)
972                                 {
973                                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE,ERR_R_MALLOC_FAILURE);
974                                 goto err;
975                                 }
976                         }
977                 if ((xn=X509_get_subject_name(x)) == NULL) goto err;
978                 /* check for duplicates */
979                 xn=X509_NAME_dup(xn);
980                 if (xn == NULL) goto err;
981                 if (sk_X509_NAME_find(sk,xn) >= 0)
982                         X509_NAME_free(xn);
983                 else
984                         {
985                         sk_X509_NAME_push(sk,xn);
986                         sk_X509_NAME_push(ret,xn);
987                         }
988                 }
989
990         if (0)
991                 {
992 err:
993                 if (ret != NULL) sk_X509_NAME_pop_free(ret,X509_NAME_free);
994                 ret=NULL;
995                 }
996         if (sk != NULL) sk_X509_NAME_free(sk);
997         if (in != NULL) BIO_free(in);
998         if (x != NULL) X509_free(x);
999         if (ret != NULL)
1000                 ERR_clear_error();
1001         return(ret);
1002         }
1003 #endif
1004
1005 /*!
1006  * Add a file of certs to a stack.
1007  * \param stack the stack to add to.
1008  * \param file the file to add from. All certs in this file that are not
1009  * already in the stack will be added.
1010  * \return 1 for success, 0 for failure. Note that in the case of failure some
1011  * certs may have been added to \c stack.
1012  */
1013
1014 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
1015                                         const char *file)
1016         {
1017         BIO *in;
1018         X509 *x=NULL;
1019         X509_NAME *xn=NULL;
1020         int ret=1;
1021         int (*oldcmp)(const X509_NAME * const *a, const X509_NAME * const *b);
1022         
1023         oldcmp=sk_X509_NAME_set_cmp_func(stack,xname_cmp);
1024         
1025         in=BIO_new(BIO_s_file_internal());
1026         
1027         if (in == NULL)
1028                 {
1029                 SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK,ERR_R_MALLOC_FAILURE);
1030                 goto err;
1031                 }
1032         
1033         if (!BIO_read_filename(in,file))
1034                 goto err;
1035         
1036         for (;;)
1037                 {
1038                 if (PEM_read_bio_X509(in,&x,NULL,NULL) == NULL)
1039                         break;
1040                 if ((xn=X509_get_subject_name(x)) == NULL) goto err;
1041                 xn=X509_NAME_dup(xn);
1042                 if (xn == NULL) goto err;
1043                 if (sk_X509_NAME_find(stack,xn) >= 0)
1044                         X509_NAME_free(xn);
1045                 else
1046                         sk_X509_NAME_push(stack,xn);
1047                 }
1048
1049         ERR_clear_error();
1050
1051         if (0)
1052                 {
1053 err:
1054                 ret=0;
1055                 }
1056         if(in != NULL)
1057                 BIO_free(in);
1058         if(x != NULL)
1059                 X509_free(x);
1060         
1061         (void)sk_X509_NAME_set_cmp_func(stack,oldcmp);
1062
1063         return ret;
1064         }
1065
1066 /*!
1067  * Add a directory of certs to a stack.
1068  * \param stack the stack to append to.
1069  * \param dir the directory to append from. All files in this directory will be
1070  * examined as potential certs. Any that are acceptable to
1071  * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
1072  * included.
1073  * \return 1 for success, 0 for failure. Note that in the case of failure some
1074  * certs may have been added to \c stack.
1075  */
1076
1077 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
1078                                        const char *dir)
1079         {
1080         OPENSSL_DIR_CTX *d = NULL;
1081         const char *filename;
1082         int ret = 0;
1083
1084         CRYPTO_w_lock(CRYPTO_LOCK_READDIR);
1085
1086         /* Note that a side effect is that the CAs will be sorted by name */
1087
1088         while((filename = OPENSSL_DIR_read(&d, dir)))
1089                 {
1090                 char buf[1024];
1091                 int r;
1092
1093                 if(strlen(dir)+strlen(filename)+2 > sizeof buf)
1094                         {
1095                         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,SSL_R_PATH_TOO_LONG);
1096                         goto err;
1097                         }
1098
1099 #ifdef OPENSSL_SYS_VMS
1100                 r = BIO_snprintf(buf,sizeof buf,"%s%s",dir,filename);
1101 #else
1102                 r = BIO_snprintf(buf,sizeof buf,"%s/%s",dir,filename);
1103 #endif
1104                 if (r <= 0 || r >= (int)sizeof(buf))
1105                         goto err;
1106                 if(!SSL_add_file_cert_subjects_to_stack(stack,buf))
1107                         goto err;
1108                 }
1109
1110         if (errno)
1111                 {
1112                 SYSerr(SYS_F_OPENDIR, get_last_sys_error());
1113                 ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
1114                 SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
1115                 goto err;
1116                 }
1117
1118         ret = 1;
1119
1120 err:
1121         if (d) OPENSSL_DIR_end(&d);
1122         CRYPTO_w_unlock(CRYPTO_LOCK_READDIR);
1123         return ret;
1124         }
1125
1126 /* Add a certificate to a BUF_MEM structure */
1127
1128 static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
1129         {
1130         int n;
1131         unsigned char *p;
1132
1133         n=i2d_X509(x,NULL);
1134         if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
1135                 {
1136                 SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
1137                 return 0;
1138                 }
1139         p=(unsigned char *)&(buf->data[*l]);
1140         l2n3(n,p);
1141         i2d_X509(x,&p);
1142         *l+=n+3;
1143
1144         return 1;
1145         }
1146
1147 /* Add certificate chain to internal SSL BUF_MEM strcuture */
1148 int ssl_add_cert_chain(SSL *s, CERT_PKEY *cpk, unsigned long *l)
1149         {
1150         BUF_MEM *buf = s->init_buf;
1151         int i;
1152
1153         X509 *x;
1154         STACK_OF(X509) *extra_certs;
1155         X509_STORE *chain_store;
1156
1157         /* TLSv1 sends a chain with nothing in it, instead of an alert */
1158         if (!BUF_MEM_grow_clean(buf,10))
1159                 {
1160                 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN,ERR_R_BUF_LIB);
1161                 return 0;
1162                 }
1163
1164         if (!cpk || !cpk->x509)
1165                 return 1;
1166
1167         x = cpk->x509;
1168
1169         /* If we have a certificate specific chain use it, else use
1170          * parent ctx.
1171          */
1172         if (cpk->chain)
1173                 extra_certs = cpk->chain;
1174         else
1175                 extra_certs = s->ctx->extra_certs;
1176
1177         if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs)
1178                 chain_store = NULL;
1179         else if (s->cert->chain_store)
1180                 chain_store = s->cert->chain_store;
1181         else
1182                 chain_store = s->ctx->cert_store;
1183
1184         if (chain_store)
1185                 {
1186                 X509_STORE_CTX xs_ctx;
1187
1188                 if (!X509_STORE_CTX_init(&xs_ctx,chain_store,x,NULL))
1189                         {
1190                         SSLerr(SSL_F_SSL_ADD_CERT_CHAIN,ERR_R_X509_LIB);
1191                         return(0);
1192                         }
1193                 X509_verify_cert(&xs_ctx);
1194                 /* Don't leave errors in the queue */
1195                 ERR_clear_error();
1196                 i = ssl_security_cert_chain(s, xs_ctx.chain, NULL, 0);
1197                 if (i != 1)
1198                         {
1199                         X509_STORE_CTX_cleanup(&xs_ctx);
1200                         SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i);
1201                         return 0;
1202                         }
1203                 for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
1204                         {
1205                         x = sk_X509_value(xs_ctx.chain, i);
1206
1207                         if (!ssl_add_cert_to_buf(buf, l, x))
1208                                 {
1209                                 X509_STORE_CTX_cleanup(&xs_ctx);
1210                                 return 0;
1211                                 }
1212                         }
1213                 X509_STORE_CTX_cleanup(&xs_ctx);
1214                 }
1215         else
1216                 {
1217                 i = ssl_security_cert_chain(s, extra_certs, x, 0);
1218                 if (i != 1)
1219                         {
1220                         SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i);
1221                         return 0;
1222                         }
1223                 if (!ssl_add_cert_to_buf(buf, l, x))
1224                         return 0;
1225                 for (i=0; i<sk_X509_num(extra_certs); i++)
1226                         {
1227                         x=sk_X509_value(extra_certs,i);
1228                         if (!ssl_add_cert_to_buf(buf, l, x))
1229                                 return 0;
1230                         }
1231                 }
1232         return 1;
1233         }
1234
1235 /* Build a certificate chain for current certificate */
1236 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
1237         {
1238         CERT *c = s ? s->cert : ctx->cert;
1239         CERT_PKEY *cpk = c->key;
1240         X509_STORE *chain_store = NULL;
1241         X509_STORE_CTX xs_ctx;
1242         STACK_OF(X509) *chain = NULL, *untrusted = NULL;
1243         X509 *x;
1244         int i, rv = 0;
1245         unsigned long error;
1246
1247         if (!cpk->x509)
1248                 {
1249                 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
1250                 goto err;
1251                 }
1252         /* Rearranging and check the chain: add everything to a store */
1253         if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
1254                 {
1255                 chain_store = X509_STORE_new();
1256                 if (!chain_store)
1257                         goto err;
1258                 for (i = 0; i < sk_X509_num(cpk->chain); i++)
1259                         {
1260                         x = sk_X509_value(cpk->chain, i);
1261                         if (!X509_STORE_add_cert(chain_store, x))
1262                                 {
1263                                 error = ERR_peek_last_error();
1264                                 if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
1265                                     ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
1266                                         goto err;
1267                                 ERR_clear_error();
1268                                 }
1269                         }
1270                 /* Add EE cert too: it might be self signed */
1271                 if (!X509_STORE_add_cert(chain_store, cpk->x509))
1272                         {
1273                         error = ERR_peek_last_error();
1274                         if (ERR_GET_LIB(error) != ERR_LIB_X509 ||
1275                             ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE)
1276                                 goto err;
1277                         ERR_clear_error();
1278                         }
1279                 }
1280         else
1281                 {
1282                 if (c->chain_store)
1283                         chain_store = c->chain_store;
1284                 else if (s)
1285                         chain_store = s->ctx->cert_store;
1286                 else
1287                         chain_store = ctx->cert_store;
1288
1289                 if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
1290                         untrusted = cpk->chain;
1291                 }
1292
1293         if (!X509_STORE_CTX_init(&xs_ctx, chain_store, cpk->x509, untrusted))
1294                 {
1295                 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
1296                 goto err;
1297                 }
1298         /* Set suite B flags if needed */
1299         X509_STORE_CTX_set_flags(&xs_ctx, c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
1300
1301         i = X509_verify_cert(&xs_ctx);
1302         if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR)
1303                 {
1304                 if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
1305                         ERR_clear_error();
1306                 i = 1;
1307                 rv = 2;
1308                 }
1309         if (i > 0)
1310                 chain = X509_STORE_CTX_get1_chain(&xs_ctx);
1311         if (i <= 0)
1312                 {
1313                 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
1314                 i = X509_STORE_CTX_get_error(&xs_ctx);
1315                 ERR_add_error_data(2, "Verify error:",
1316                                         X509_verify_cert_error_string(i));
1317
1318                 X509_STORE_CTX_cleanup(&xs_ctx);
1319                 goto err;
1320                 }
1321         X509_STORE_CTX_cleanup(&xs_ctx);
1322         /* Remove EE certificate from chain */
1323         x = sk_X509_shift(chain);
1324         X509_free(x);
1325         if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT)
1326                 {
1327                 if (sk_X509_num(chain) > 0)
1328                         {
1329                         /* See if last cert is self signed */
1330                         x = sk_X509_value(chain, sk_X509_num(chain) - 1);
1331                         X509_check_purpose(x, -1, 0);
1332                         if (x->ex_flags & EXFLAG_SS)
1333                                 {
1334                                 x = sk_X509_pop(chain);
1335                                 X509_free(x);
1336                                 }
1337                         }
1338                 }
1339         /* Check security level of all CA certificates: EE will have been
1340          * checked already.
1341          */
1342         for (i = 0; i < sk_X509_num(chain); i++)
1343                 {
1344                 x = sk_X509_value(chain, i);
1345                 rv = ssl_security_cert(s, ctx, x, 0, 0);
1346                 if (rv != 1)
1347                         {
1348                         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
1349                         sk_X509_pop_free(chain, X509_free);
1350                         rv = 0;
1351                         goto err;
1352                         }
1353                 }
1354         if (cpk->chain)
1355                 sk_X509_pop_free(cpk->chain, X509_free);
1356         cpk->chain = chain;
1357         if (rv == 0)
1358                 rv = 1;
1359         err:
1360         if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
1361                 X509_STORE_free(chain_store);
1362
1363         return rv;
1364         }
1365
1366 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
1367         {
1368         X509_STORE **pstore;
1369         if (chain)
1370                 pstore = &c->chain_store;
1371         else
1372                 pstore = &c->verify_store;
1373         if (*pstore)
1374                 X509_STORE_free(*pstore);
1375         *pstore = store;
1376         if (ref && store)
1377                 CRYPTO_add(&store->references, 1, CRYPTO_LOCK_X509_STORE);
1378         return 1;
1379         }
1380
1381 static int ssl_security_default_callback(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex)
1382         {
1383         int level, minbits;
1384         static const int minbits_table[5] = {80, 112, 128, 192, 256};
1385         if (ctx)
1386                 level = SSL_CTX_get_security_level(ctx);
1387         else
1388                 level = SSL_get_security_level(s);
1389         /* Level 0: anything goes */
1390         if (level <= 0)
1391                 return 1;
1392         if (level > 5)
1393                 level = 5;
1394         minbits = minbits_table[level - 1];
1395         switch (op)
1396                 {
1397         case SSL_SECOP_CIPHER_SUPPORTED:
1398         case SSL_SECOP_CIPHER_SHARED:
1399         case SSL_SECOP_CIPHER_CHECK:
1400                 {
1401                 const SSL_CIPHER *c = other;
1402                 /* No ciphers below security level */
1403                 if (bits < minbits)
1404                         return 0;
1405                 /* No SSLv2 ciphers */
1406                 if ((SSL_CIPHER_get_id(c) >> 24) == 0x2)
1407                         return 0;
1408                 /* No unauthenticated ciphersuites */
1409                 if (c->algorithm_auth & SSL_aNULL)
1410                         return 0;
1411                 /* No MD5 mac ciphersuites */
1412                 if (c->algorithm_mac & SSL_MD5)
1413                         return 0;
1414                 /* Level 2: no RC4 */
1415                 if (level >= 2 && c->algorithm_enc == SSL_RC4)
1416                         return 0;
1417                 /* Level 3: forward secure ciphersuites only */
1418                 if (level >= 3 && !(c->algorithm_mkey & (SSL_kEDH|SSL_kEECDH)))
1419                         return 0;
1420                 break;
1421                 }
1422         case SSL_SECOP_VERSION:
1423                 /* SSLv2 allowed only on level zero */
1424                 if (nid == SSL2_VERSION)
1425                         return 0;
1426                 /* SSLv3 not allowed on level 2 */
1427                 if (nid <= SSL3_VERSION && level >= 2)
1428                         return 0;
1429                 /* TLS v1.1 and above only for level 3 */
1430                 if (nid <= TLS1_VERSION && level >= 3)
1431                         return 0;
1432                 /* TLS v1.2 only for level 4 and above */
1433                 if (nid <= TLS1_1_VERSION && level >= 4)
1434                         return 0;
1435                 break;
1436
1437         case SSL_SECOP_COMPRESSION:
1438                 if (level >= 2)
1439                         return 0;
1440                 break;
1441         case SSL_SECOP_TICKET:
1442                 if (level >= 3)
1443                         return 0;
1444                 break;
1445         case SSL_SECOP_SSL2_COMPAT:
1446                 /* SSLv2 compatible client hello only for level zero */
1447                 return 0;
1448         default:
1449                 if (bits < minbits)
1450                         return 0;
1451                 }
1452         return 1;
1453         }
1454
1455 int ssl_security(SSL *s, int op, int bits, int nid, void *other)
1456         {
1457         return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1458         }
1459
1460 int ssl_ctx_security(SSL_CTX *ctx, int op, int bits, int nid, void *other)
1461         {
1462         return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other, ctx->cert->sec_ex);
1463         }