fc40f391e304a522c43430b055f48a46b43c7702
[openssl.git] / apps / s_cb.c
1 /* apps/s_cb.c - callback functions used by s_client, s_server, and s_time */
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) 1998-2006 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 #include <stdio.h>
113 #include <stdlib.h>
114 #define USE_SOCKETS
115 #define NON_MAIN
116 #include "apps.h"
117 #undef NON_MAIN
118 #undef USE_SOCKETS
119 #include <openssl/err.h>
120 #include <openssl/rand.h>
121 #include <openssl/x509.h>
122 #include <openssl/ssl.h>
123 #include "s_apps.h"
124
125 #define COOKIE_SECRET_LENGTH    16
126
127 int verify_depth=0;
128 int verify_error=X509_V_OK;
129 int verify_return_error=0;
130 unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
131 int cookie_initialized=0;
132
133 int MS_CALLBACK verify_callback(int ok, X509_STORE_CTX *ctx)
134         {
135         X509 *err_cert;
136         int err,depth;
137
138         err_cert=X509_STORE_CTX_get_current_cert(ctx);
139         err=    X509_STORE_CTX_get_error(ctx);
140         depth=  X509_STORE_CTX_get_error_depth(ctx);
141
142         BIO_printf(bio_err,"depth=%d ",depth);
143         if (err_cert)
144                 {
145                 X509_NAME_print_ex(bio_err, X509_get_subject_name(err_cert),
146                                         0, XN_FLAG_ONELINE);
147                 BIO_puts(bio_err, "\n");
148                 }
149         else
150                 BIO_puts(bio_err, "<no cert>\n");
151         if (!ok)
152                 {
153                 BIO_printf(bio_err,"verify error:num=%d:%s\n",err,
154                         X509_verify_cert_error_string(err));
155                 if (verify_depth >= depth)
156                         {
157                         if (!verify_return_error)
158                                 ok=1;
159                         verify_error=X509_V_OK;
160                         }
161                 else
162                         {
163                         ok=0;
164                         verify_error=X509_V_ERR_CERT_CHAIN_TOO_LONG;
165                         }
166                 }
167         switch (err)
168                 {
169         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
170                 BIO_puts(bio_err,"issuer= ");
171                 X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
172                                         0, XN_FLAG_ONELINE);
173                 BIO_puts(bio_err, "\n");
174                 break;
175         case X509_V_ERR_CERT_NOT_YET_VALID:
176         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
177                 BIO_printf(bio_err,"notBefore=");
178                 ASN1_TIME_print(bio_err,X509_get_notBefore(err_cert));
179                 BIO_printf(bio_err,"\n");
180                 break;
181         case X509_V_ERR_CERT_HAS_EXPIRED:
182         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
183                 BIO_printf(bio_err,"notAfter=");
184                 ASN1_TIME_print(bio_err,X509_get_notAfter(err_cert));
185                 BIO_printf(bio_err,"\n");
186                 break;
187         case X509_V_ERR_NO_EXPLICIT_POLICY:
188                 policies_print(bio_err, ctx);
189                 break;
190                 }
191         if (err == X509_V_OK && ok == 2)
192                 policies_print(bio_err, ctx);
193
194         BIO_printf(bio_err,"verify return:%d\n",ok);
195         return(ok);
196         }
197
198 int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
199         {
200         if (cert_file != NULL)
201                 {
202                 /*
203                 SSL *ssl;
204                 X509 *x509;
205                 */
206
207                 if (SSL_CTX_use_certificate_file(ctx,cert_file,
208                         SSL_FILETYPE_PEM) <= 0)
209                         {
210                         BIO_printf(bio_err,"unable to get certificate from '%s'\n",cert_file);
211                         ERR_print_errors(bio_err);
212                         return(0);
213                         }
214                 if (key_file == NULL) key_file=cert_file;
215                 if (SSL_CTX_use_PrivateKey_file(ctx,key_file,
216                         SSL_FILETYPE_PEM) <= 0)
217                         {
218                         BIO_printf(bio_err,"unable to get private key from '%s'\n",key_file);
219                         ERR_print_errors(bio_err);
220                         return(0);
221                         }
222
223                 /*
224                 In theory this is no longer needed 
225                 ssl=SSL_new(ctx);
226                 x509=SSL_get_certificate(ssl);
227
228                 if (x509 != NULL) {
229                         EVP_PKEY *pktmp;
230                         pktmp = X509_get_pubkey(x509);
231                         EVP_PKEY_copy_parameters(pktmp,
232                                                 SSL_get_privatekey(ssl));
233                         EVP_PKEY_free(pktmp);
234                 }
235                 SSL_free(ssl);
236                 */
237
238                 /* If we are using DSA, we can copy the parameters from
239                  * the private key */
240
241
242                 /* Now we know that a key and cert have been set against
243                  * the SSL context */
244                 if (!SSL_CTX_check_private_key(ctx))
245                         {
246                         BIO_printf(bio_err,"Private key does not match the certificate public key\n");
247                         return(0);
248                         }
249                 }
250         return(1);
251         }
252
253 int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key,
254                        STACK_OF(X509) *chain, int build_chain)
255         {
256         if (cert == NULL)
257                 return 1;
258         if (SSL_CTX_use_certificate(ctx,cert) <= 0)
259                 {
260                 BIO_printf(bio_err,"error setting certificate\n");
261                 ERR_print_errors(bio_err);
262                 return 0;
263                 }
264
265         if (SSL_CTX_use_PrivateKey(ctx,key) <= 0)
266                 {
267                 BIO_printf(bio_err,"error setting private key\n");
268                 ERR_print_errors(bio_err);
269                 return 0;
270                 }
271                  
272         /* Now we know that a key and cert have been set against
273          * the SSL context */
274         if (!SSL_CTX_check_private_key(ctx))
275                 {
276                 BIO_printf(bio_err,"Private key does not match the certificate public key\n");
277                 return 0;
278                 }
279         if (chain && !SSL_CTX_set1_chain(ctx, chain))
280                 {
281                 BIO_printf(bio_err,"error setting certificate chain\n");
282                 ERR_print_errors(bio_err);
283                 return 0;
284                 }
285         if (!chain && build_chain && !SSL_CTX_build_cert_chain(ctx, 0))
286                 {
287                 BIO_printf(bio_err,"error building certificate chain\n");
288                 ERR_print_errors(bio_err);
289                 return 0;
290                 }
291                 
292         return 1;
293         }
294
295 static void ssl_print_client_cert_types(BIO *bio, SSL *s)
296         {
297         const unsigned char *p;
298         int i;
299         int cert_type_num = SSL_get0_certificate_types(s, &p);
300         if (!cert_type_num)
301                 return;
302         BIO_puts(bio, "Client Certificate Types: ");
303         for (i = 0; i < cert_type_num; i++)
304                 {
305                 unsigned char cert_type = p[i];
306                 char *cname;
307                 switch(cert_type)
308                         {
309                 case TLS_CT_RSA_SIGN:
310                         cname = "RSA sign";
311                         break;
312
313                 case TLS_CT_DSS_SIGN:
314                         cname = "DSA sign";
315                         break;
316
317                 case TLS_CT_RSA_FIXED_DH:
318                         cname = "RSA fixed DH";
319                         break;
320
321                 case TLS_CT_DSS_FIXED_DH:
322                         cname = "DSS fixed DH";
323                         break;
324
325                 case TLS_CT_ECDSA_SIGN:
326                         cname = "ECDSA sign";
327                         break;
328
329                 case TLS_CT_RSA_FIXED_ECDH:
330                         cname = "RSA fixed ECDH";
331                         break;
332
333                 case TLS_CT_ECDSA_FIXED_ECDH:
334                         cname = "ECDSA fixed ECDH";
335                         break;
336
337                 case TLS_CT_GOST94_SIGN:
338                         cname = "GOST94 Sign";
339                         break;
340
341                 case TLS_CT_GOST01_SIGN:
342                         cname = "GOST01 Sign";
343                         break;
344
345                 default:
346                          cname = NULL;
347                         }
348
349                 if (i)
350                         BIO_puts(bio, ", ");
351
352                 if (cname)
353                         BIO_puts(bio, cname);
354                 else
355                         BIO_printf(bio, "UNKNOWN (%d),", cert_type);
356                 }
357         BIO_puts(bio, "\n");
358         }
359
360 static int do_print_sigalgs(BIO *out, SSL *s, int shared)
361         {
362         int i, nsig, client;
363         client = SSL_is_server(s) ? 0 : 1;
364         if (shared)
365                 nsig = SSL_get_shared_sigalgs(s, -1, NULL, NULL, NULL,
366                                                         NULL, NULL);
367         else
368                 nsig = SSL_get_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
369         if (nsig == 0)
370                 return 1;
371
372         if (shared)
373                 BIO_puts(out, "Shared ");
374
375         if (client)
376                 BIO_puts(out, "Requested ");
377         BIO_puts(out, "Signature Algorithms: ");
378         for (i = 0; i < nsig; i++)
379                 {
380                 int hash_nid, sign_nid;
381                 unsigned char rhash, rsign;
382                 const char *sstr = NULL;
383                 if (shared)
384                         SSL_get_shared_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
385                                                         &rsign, &rhash);
386                 else
387                         SSL_get_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
388                                                         &rsign, &rhash);
389                 if (i)
390                         BIO_puts(out, ":");
391                 if (sign_nid == EVP_PKEY_RSA)
392                         sstr = "RSA";
393                 else if(sign_nid == EVP_PKEY_DSA)
394                         sstr = "DSA";
395                 else if(sign_nid == EVP_PKEY_EC)
396                         sstr = "ECDSA";
397                 if (sstr)
398                         BIO_printf(out,"%s+", sstr);
399                 else
400                         BIO_printf(out,"0x%02X+", (int)rsign);
401                 if (hash_nid != NID_undef)
402                         BIO_printf(out, "%s", OBJ_nid2sn(hash_nid));
403                 else
404                         BIO_printf(out,"0x%02X", (int)rhash);
405                 }
406         BIO_puts(out, "\n");
407         return 1;
408         }
409
410 int ssl_print_sigalgs(BIO *out, SSL *s)
411         {
412         int mdnid;
413         if (!SSL_is_server(s))
414                 ssl_print_client_cert_types(out, s);
415         do_print_sigalgs(out, s, 0);
416         do_print_sigalgs(out, s, 1);
417         if (SSL_get_peer_signature_nid(s, &mdnid))
418                 BIO_printf(out, "Peer signing digest: %s\n", OBJ_nid2sn(mdnid));
419         return 1;
420         }
421
422 int ssl_print_curves(BIO *out, SSL *s)
423         {
424         int i, ncurves, *curves, nid;
425         const char *cname;
426         ncurves = SSL_get1_curves(s, NULL);
427         if (ncurves <= 0)
428                 return 1;
429         curves = OPENSSL_malloc(ncurves * sizeof(int));
430         SSL_get1_curves(s, curves);
431
432         BIO_puts(out, "Supported Elliptic Curves: ");
433         for (i = 0; i < ncurves; i++)
434                 {
435                 if (i)
436                         BIO_puts(out, ":");
437                 nid = curves[i];
438                 /* If unrecognised print out hex version */
439                 if (nid & TLSEXT_nid_unknown)
440                         BIO_printf(out, "0x%04X", nid & 0xFFFF);
441                 else
442                         {
443                         /* Use NIST name for curve if it exists */
444                         cname = EC_curve_nid2nist(nid);
445                         if (!cname)
446                                 cname = OBJ_nid2sn(nid);
447                         BIO_printf(out, "%s", cname);
448                         }
449                 }
450         BIO_puts(out, "\nShared Elliptic curves: ");
451         OPENSSL_free(curves);
452         ncurves = SSL_get_shared_curve(s, -1);
453         for (i = 0; i < ncurves; i++)
454                 {
455                 if (i)
456                         BIO_puts(out, ":");
457                 nid = SSL_get_shared_curve(s, i);
458                 cname = EC_curve_nid2nist(nid);
459                 if (!cname)
460                         cname = OBJ_nid2sn(nid);
461                 BIO_printf(out, "%s", cname);
462                 }
463         if (ncurves == 0)
464                 BIO_puts(out, "NONE");
465         BIO_puts(out, "\n");
466         return 1;
467         }
468
469 int ssl_print_tmp_key(BIO *out, SSL *s)
470         {
471         EVP_PKEY *key;
472         if (!SSL_get_server_tmp_key(s, &key))
473                 return 1;
474         BIO_puts(out, "Server Temp Key: ");
475         switch (EVP_PKEY_id(key))
476                 {
477         case EVP_PKEY_RSA:
478                 BIO_printf(out, "RSA, %d bits\n", EVP_PKEY_bits(key));
479                 break;
480
481         case EVP_PKEY_DH:
482                 BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(key));
483                 break;
484
485         case EVP_PKEY_EC:
486                         {
487                         EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
488                         int nid;
489                         const char *cname;
490                         nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
491                         EC_KEY_free(ec);
492                         cname = EC_curve_nid2nist(nid);
493                         if (!cname)
494                                 cname = OBJ_nid2sn(nid);
495                         BIO_printf(out, "ECDH, %s, %d bits\n",
496                                                 cname, EVP_PKEY_bits(key));
497                         }
498                 }
499         EVP_PKEY_free(key);
500         return 1;
501         }
502                 
503
504 long MS_CALLBACK bio_dump_callback(BIO *bio, int cmd, const char *argp,
505                                    int argi, long argl, long ret)
506         {
507         BIO *out;
508
509         out=(BIO *)BIO_get_callback_arg(bio);
510         if (out == NULL) return(ret);
511
512         if (cmd == (BIO_CB_READ|BIO_CB_RETURN))
513                 {
514                 BIO_printf(out,"read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
515                         (void *)bio,argp,(unsigned long)argi,ret,ret);
516                 BIO_dump(out,argp,(int)ret);
517                 return(ret);
518                 }
519         else if (cmd == (BIO_CB_WRITE|BIO_CB_RETURN))
520                 {
521                 BIO_printf(out,"write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
522                         (void *)bio,argp,(unsigned long)argi,ret,ret);
523                 BIO_dump(out,argp,(int)ret);
524                 }
525         return(ret);
526         }
527
528 void MS_CALLBACK apps_ssl_info_callback(const SSL *s, int where, int ret)
529         {
530         const char *str;
531         int w;
532
533         w=where& ~SSL_ST_MASK;
534
535         if (w & SSL_ST_CONNECT) str="SSL_connect";
536         else if (w & SSL_ST_ACCEPT) str="SSL_accept";
537         else str="undefined";
538
539         if (where & SSL_CB_LOOP)
540                 {
541                 BIO_printf(bio_err,"%s:%s\n",str,SSL_state_string_long(s));
542                 }
543         else if (where & SSL_CB_ALERT)
544                 {
545                 str=(where & SSL_CB_READ)?"read":"write";
546                 BIO_printf(bio_err,"SSL3 alert %s:%s:%s\n",
547                         str,
548                         SSL_alert_type_string_long(ret),
549                         SSL_alert_desc_string_long(ret));
550                 }
551         else if (where & SSL_CB_EXIT)
552                 {
553                 if (ret == 0)
554                         BIO_printf(bio_err,"%s:failed in %s\n",
555                                 str,SSL_state_string_long(s));
556                 else if (ret < 0)
557                         {
558                         BIO_printf(bio_err,"%s:error in %s\n",
559                                 str,SSL_state_string_long(s));
560                         }
561                 }
562         }
563
564
565 void MS_CALLBACK msg_cb(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)
566         {
567         BIO *bio = arg;
568         const char *str_write_p, *str_version, *str_content_type = "", *str_details1 = "", *str_details2= "";
569         
570         str_write_p = write_p ? ">>>" : "<<<";
571
572         switch (version)
573                 {
574         case SSL2_VERSION:
575                 str_version = "SSL 2.0";
576                 break;
577         case SSL3_VERSION:
578                 str_version = "SSL 3.0 ";
579                 break;
580         case TLS1_VERSION:
581                 str_version = "TLS 1.0 ";
582                 break;
583         case TLS1_1_VERSION:
584                 str_version = "TLS 1.1 ";
585                 break;
586         case TLS1_2_VERSION:
587                 str_version = "TLS 1.2 ";
588                 break;
589         case DTLS1_VERSION:
590                 str_version = "DTLS 1.0 ";
591                 break;
592         case DTLS1_BAD_VER:
593                 str_version = "DTLS 1.0 (bad) ";
594                 break;
595         default:
596                 str_version = "???";
597                 }
598
599         if (version == SSL2_VERSION)
600                 {
601                 str_details1 = "???";
602
603                 if (len > 0)
604                         {
605                         switch (((const unsigned char*)buf)[0])
606                                 {
607                                 case 0:
608                                         str_details1 = ", ERROR:";
609                                         str_details2 = " ???";
610                                         if (len >= 3)
611                                                 {
612                                                 unsigned err = (((const unsigned char*)buf)[1]<<8) + ((const unsigned char*)buf)[2];
613                                                 
614                                                 switch (err)
615                                                         {
616                                                 case 0x0001:
617                                                         str_details2 = " NO-CIPHER-ERROR";
618                                                         break;
619                                                 case 0x0002:
620                                                         str_details2 = " NO-CERTIFICATE-ERROR";
621                                                         break;
622                                                 case 0x0004:
623                                                         str_details2 = " BAD-CERTIFICATE-ERROR";
624                                                         break;
625                                                 case 0x0006:
626                                                         str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
627                                                         break;
628                                                         }
629                                                 }
630
631                                         break;
632                                 case 1:
633                                         str_details1 = ", CLIENT-HELLO";
634                                         break;
635                                 case 2:
636                                         str_details1 = ", CLIENT-MASTER-KEY";
637                                         break;
638                                 case 3:
639                                         str_details1 = ", CLIENT-FINISHED";
640                                         break;
641                                 case 4:
642                                         str_details1 = ", SERVER-HELLO";
643                                         break;
644                                 case 5:
645                                         str_details1 = ", SERVER-VERIFY";
646                                         break;
647                                 case 6:
648                                         str_details1 = ", SERVER-FINISHED";
649                                         break;
650                                 case 7:
651                                         str_details1 = ", REQUEST-CERTIFICATE";
652                                         break;
653                                 case 8:
654                                         str_details1 = ", CLIENT-CERTIFICATE";
655                                         break;
656                                 }
657                         }
658                 }
659
660         if (version == SSL3_VERSION ||
661             version == TLS1_VERSION ||
662             version == TLS1_1_VERSION ||
663             version == TLS1_2_VERSION ||
664             version == DTLS1_VERSION ||
665             version == DTLS1_BAD_VER)
666                 {
667                 switch (content_type)
668                         {
669                 case 20:
670                         str_content_type = "ChangeCipherSpec";
671                         break;
672                 case 21:
673                         str_content_type = "Alert";
674                         break;
675                 case 22:
676                         str_content_type = "Handshake";
677                         break;
678                         }
679
680                 if (content_type == 21) /* Alert */
681                         {
682                         str_details1 = ", ???";
683                         
684                         if (len == 2)
685                                 {
686                                 switch (((const unsigned char*)buf)[0])
687                                         {
688                                 case 1:
689                                         str_details1 = ", warning";
690                                         break;
691                                 case 2:
692                                         str_details1 = ", fatal";
693                                         break;
694                                         }
695
696                                 str_details2 = " ???";
697                                 switch (((const unsigned char*)buf)[1])
698                                         {
699                                 case 0:
700                                         str_details2 = " close_notify";
701                                         break;
702                                 case 10:
703                                         str_details2 = " unexpected_message";
704                                         break;
705                                 case 20:
706                                         str_details2 = " bad_record_mac";
707                                         break;
708                                 case 21:
709                                         str_details2 = " decryption_failed";
710                                         break;
711                                 case 22:
712                                         str_details2 = " record_overflow";
713                                         break;
714                                 case 30:
715                                         str_details2 = " decompression_failure";
716                                         break;
717                                 case 40:
718                                         str_details2 = " handshake_failure";
719                                         break;
720                                 case 42:
721                                         str_details2 = " bad_certificate";
722                                         break;
723                                 case 43:
724                                         str_details2 = " unsupported_certificate";
725                                         break;
726                                 case 44:
727                                         str_details2 = " certificate_revoked";
728                                         break;
729                                 case 45:
730                                         str_details2 = " certificate_expired";
731                                         break;
732                                 case 46:
733                                         str_details2 = " certificate_unknown";
734                                         break;
735                                 case 47:
736                                         str_details2 = " illegal_parameter";
737                                         break;
738                                 case 48:
739                                         str_details2 = " unknown_ca";
740                                         break;
741                                 case 49:
742                                         str_details2 = " access_denied";
743                                         break;
744                                 case 50:
745                                         str_details2 = " decode_error";
746                                         break;
747                                 case 51:
748                                         str_details2 = " decrypt_error";
749                                         break;
750                                 case 60:
751                                         str_details2 = " export_restriction";
752                                         break;
753                                 case 70:
754                                         str_details2 = " protocol_version";
755                                         break;
756                                 case 71:
757                                         str_details2 = " insufficient_security";
758                                         break;
759                                 case 80:
760                                         str_details2 = " internal_error";
761                                         break;
762                                 case 90:
763                                         str_details2 = " user_canceled";
764                                         break;
765                                 case 100:
766                                         str_details2 = " no_renegotiation";
767                                         break;
768                                 case 110:
769                                         str_details2 = " unsupported_extension";
770                                         break;
771                                 case 111:
772                                         str_details2 = " certificate_unobtainable";
773                                         break;
774                                 case 112:
775                                         str_details2 = " unrecognized_name";
776                                         break;
777                                 case 113:
778                                         str_details2 = " bad_certificate_status_response";
779                                         break;
780                                 case 114:
781                                         str_details2 = " bad_certificate_hash_value";
782                                         break;
783                                 case 115:
784                                         str_details2 = " unknown_psk_identity";
785                                         break;
786                                         }
787                                 }
788                         }
789                 
790                 if (content_type == 22) /* Handshake */
791                         {
792                         str_details1 = "???";
793
794                         if (len > 0)
795                                 {
796                                 switch (((const unsigned char*)buf)[0])
797                                         {
798                                 case 0:
799                                         str_details1 = ", HelloRequest";
800                                         break;
801                                 case 1:
802                                         str_details1 = ", ClientHello";
803                                         break;
804                                 case 2:
805                                         str_details1 = ", ServerHello";
806                                         break;
807                                 case 3:
808                                         str_details1 = ", HelloVerifyRequest";
809                                         break;
810                                 case 11:
811                                         str_details1 = ", Certificate";
812                                         break;
813                                 case 12:
814                                         str_details1 = ", ServerKeyExchange";
815                                         break;
816                                 case 13:
817                                         str_details1 = ", CertificateRequest";
818                                         break;
819                                 case 14:
820                                         str_details1 = ", ServerHelloDone";
821                                         break;
822                                 case 15:
823                                         str_details1 = ", CertificateVerify";
824                                         break;
825                                 case 16:
826                                         str_details1 = ", ClientKeyExchange";
827                                         break;
828                                 case 20:
829                                         str_details1 = ", Finished";
830                                         break;
831                                         }
832                                 }
833                         }
834
835 #ifndef OPENSSL_NO_HEARTBEATS
836                 if (content_type == 24) /* Heartbeat */
837                         {
838                         str_details1 = ", Heartbeat";
839                         
840                         if (len > 0)
841                                 {
842                                 switch (((const unsigned char*)buf)[0])
843                                         {
844                                 case 1:
845                                         str_details1 = ", HeartbeatRequest";
846                                         break;
847                                 case 2:
848                                         str_details1 = ", HeartbeatResponse";
849                                         break;
850                                         }
851                                 }
852                         }
853 #endif
854                 }
855
856         BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version, str_content_type, (unsigned long)len, str_details1, str_details2);
857
858         if (len > 0)
859                 {
860                 size_t num, i;
861                 
862                 BIO_printf(bio, "   ");
863                 num = len;
864 #if 0
865                 if (num > 16)
866                         num = 16;
867 #endif
868                 for (i = 0; i < num; i++)
869                         {
870                         if (i % 16 == 0 && i > 0)
871                                 BIO_printf(bio, "\n   ");
872                         BIO_printf(bio, " %02x", ((const unsigned char*)buf)[i]);
873                         }
874                 if (i < len)
875                         BIO_printf(bio, " ...");
876                 BIO_printf(bio, "\n");
877                 }
878         (void)BIO_flush(bio);
879         }
880
881 void MS_CALLBACK tlsext_cb(SSL *s, int client_server, int type,
882                                         unsigned char *data, int len,
883                                         void *arg)
884         {
885         BIO *bio = arg;
886         char *extname;
887
888         switch(type)
889                 {
890                 case TLSEXT_TYPE_server_name:
891                 extname = "server name";
892                 break;
893
894                 case TLSEXT_TYPE_max_fragment_length:
895                 extname = "max fragment length";
896                 break;
897
898                 case TLSEXT_TYPE_client_certificate_url:
899                 extname = "client certificate URL";
900                 break;
901
902                 case TLSEXT_TYPE_trusted_ca_keys:
903                 extname = "trusted CA keys";
904                 break;
905
906                 case TLSEXT_TYPE_truncated_hmac:
907                 extname = "truncated HMAC";
908                 break;
909
910                 case TLSEXT_TYPE_status_request:
911                 extname = "status request";
912                 break;
913
914                 case TLSEXT_TYPE_user_mapping:
915                 extname = "user mapping";
916                 break;
917
918                 case TLSEXT_TYPE_client_authz:
919                 extname = "client authz";
920                 break;
921
922                 case TLSEXT_TYPE_server_authz:
923                 extname = "server authz";
924                 break;
925
926                 case TLSEXT_TYPE_cert_type:
927                 extname = "cert type";
928                 break;
929
930                 case TLSEXT_TYPE_elliptic_curves:
931                 extname = "elliptic curves";
932                 break;
933
934                 case TLSEXT_TYPE_ec_point_formats:
935                 extname = "EC point formats";
936                 break;
937
938                 case TLSEXT_TYPE_srp:
939                 extname = "SRP";
940                 break;
941
942                 case TLSEXT_TYPE_signature_algorithms:
943                 extname = "signature algorithms";
944                 break;
945
946                 case TLSEXT_TYPE_use_srtp:
947                 extname = "use SRTP";
948                 break;
949
950                 case TLSEXT_TYPE_heartbeat:
951                 extname = "heartbeat";
952                 break;
953
954                 case TLSEXT_TYPE_session_ticket:
955                 extname = "session ticket";
956                 break;
957
958                 case TLSEXT_TYPE_renegotiate: 
959                 extname = "renegotiation info";
960                 break;
961
962 #ifdef TLSEXT_TYPE_opaque_prf_input
963                 case TLSEXT_TYPE_opaque_prf_input:
964                 extname = "opaque PRF input";
965                 break;
966 #endif
967 #ifdef TLSEXT_TYPE_next_proto_neg
968                 case TLSEXT_TYPE_next_proto_neg:
969                 extname = "next protocol";
970                 break;
971 #endif
972
973                 default:
974                 extname = "unknown";
975                 break;
976
977                 }
978         
979         BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
980                         client_server ? "server": "client",
981                         extname, type, len);
982         BIO_dump(bio, (char *)data, len);
983         (void)BIO_flush(bio);
984         }
985
986 int MS_CALLBACK generate_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)
987         {
988         unsigned char *buffer, result[EVP_MAX_MD_SIZE];
989         unsigned int length, resultlength;
990         union {
991                 struct sockaddr sa;
992                 struct sockaddr_in s4;
993 #if OPENSSL_USE_IPV6
994                 struct sockaddr_in6 s6;
995 #endif
996         } peer;
997
998         /* Initialize a random secret */
999         if (!cookie_initialized)
1000                 {
1001                 if (!RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH))
1002                         {
1003                         BIO_printf(bio_err,"error setting random cookie secret\n");
1004                         return 0;
1005                         }
1006                 cookie_initialized = 1;
1007                 }
1008
1009         /* Read peer information */
1010         (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
1011
1012         /* Create buffer with peer's address and port */
1013         length = 0;
1014         switch (peer.sa.sa_family)
1015                 {
1016         case AF_INET:
1017                 length += sizeof(struct in_addr);
1018                 length += sizeof(peer.s4.sin_port);
1019                 break;
1020 #if OPENSSL_USE_IPV6
1021         case AF_INET6:
1022                 length += sizeof(struct in6_addr);
1023                 length += sizeof(peer.s6.sin6_port);
1024                 break;
1025 #endif
1026         default:
1027                 OPENSSL_assert(0);
1028                 break;
1029                 }
1030         buffer = OPENSSL_malloc(length);
1031
1032         if (buffer == NULL)
1033                 {
1034                 BIO_printf(bio_err,"out of memory\n");
1035                 return 0;
1036                 }
1037
1038         switch (peer.sa.sa_family)
1039                 {
1040         case AF_INET:
1041                 memcpy(buffer,
1042                        &peer.s4.sin_port,
1043                        sizeof(peer.s4.sin_port));
1044                 memcpy(buffer + sizeof(peer.s4.sin_port),
1045                        &peer.s4.sin_addr,
1046                        sizeof(struct in_addr));
1047                 break;
1048 #if OPENSSL_USE_IPV6
1049         case AF_INET6:
1050                 memcpy(buffer,
1051                        &peer.s6.sin6_port,
1052                        sizeof(peer.s6.sin6_port));
1053                 memcpy(buffer + sizeof(peer.s6.sin6_port),
1054                        &peer.s6.sin6_addr,
1055                        sizeof(struct in6_addr));
1056                 break;
1057 #endif
1058         default:
1059                 OPENSSL_assert(0);
1060                 break;
1061                 }
1062
1063         /* Calculate HMAC of buffer using the secret */
1064         HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
1065              buffer, length, result, &resultlength);
1066         OPENSSL_free(buffer);
1067
1068         memcpy(cookie, result, resultlength);
1069         *cookie_len = resultlength;
1070
1071         return 1;
1072         }
1073
1074 int MS_CALLBACK verify_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)
1075         {
1076         unsigned char *buffer, result[EVP_MAX_MD_SIZE];
1077         unsigned int length, resultlength;
1078         union {
1079                 struct sockaddr sa;
1080                 struct sockaddr_in s4;
1081 #if OPENSSL_USE_IPV6
1082                 struct sockaddr_in6 s6;
1083 #endif
1084         } peer;
1085
1086         /* If secret isn't initialized yet, the cookie can't be valid */
1087         if (!cookie_initialized)
1088                 return 0;
1089
1090         /* Read peer information */
1091         (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
1092
1093         /* Create buffer with peer's address and port */
1094         length = 0;
1095         switch (peer.sa.sa_family)
1096                 {
1097         case AF_INET:
1098                 length += sizeof(struct in_addr);
1099                 length += sizeof(peer.s4.sin_port);
1100                 break;
1101 #if OPENSSL_USE_IPV6
1102         case AF_INET6:
1103                 length += sizeof(struct in6_addr);
1104                 length += sizeof(peer.s6.sin6_port);
1105                 break;
1106 #endif
1107         default:
1108                 OPENSSL_assert(0);
1109                 break;
1110                 }
1111         buffer = OPENSSL_malloc(length);
1112         
1113         if (buffer == NULL)
1114                 {
1115                 BIO_printf(bio_err,"out of memory\n");
1116                 return 0;
1117                 }
1118
1119         switch (peer.sa.sa_family)
1120                 {
1121         case AF_INET:
1122                 memcpy(buffer,
1123                        &peer.s4.sin_port,
1124                        sizeof(peer.s4.sin_port));
1125                 memcpy(buffer + sizeof(peer.s4.sin_port),
1126                        &peer.s4.sin_addr,
1127                        sizeof(struct in_addr));
1128                 break;
1129 #if OPENSSL_USE_IPV6
1130         case AF_INET6:
1131                 memcpy(buffer,
1132                        &peer.s6.sin6_port,
1133                        sizeof(peer.s6.sin6_port));
1134                 memcpy(buffer + sizeof(peer.s6.sin6_port),
1135                        &peer.s6.sin6_addr,
1136                        sizeof(struct in6_addr));
1137                 break;
1138 #endif
1139         default:
1140                 OPENSSL_assert(0);
1141                 break;
1142                 }
1143
1144         /* Calculate HMAC of buffer using the secret */
1145         HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
1146              buffer, length, result, &resultlength);
1147         OPENSSL_free(buffer);
1148
1149         if (cookie_len == resultlength && memcmp(result, cookie, resultlength) == 0)
1150                 return 1;
1151
1152         return 0;
1153         }
1154
1155 /* Example of extended certificate handling. Where the standard support
1156  * of one certificate per algorithm is not sufficient an application
1157  * can decide which certificate(s) to use at runtime based on whatever
1158  * criteria it deems appropriate.
1159  */
1160
1161 /* Linked list of certificates, keys and chains */
1162 struct  ssl_excert_st
1163         {
1164         int certform;
1165         const char *certfile;
1166         int keyform;
1167         const char *keyfile;
1168         const char *chainfile;
1169         X509 *cert;
1170         EVP_PKEY *key;
1171         STACK_OF(X509) *chain;
1172         int build_chain;
1173         struct ssl_excert_st *next, *prev;
1174         };
1175
1176 struct chain_flags
1177         {
1178         int flag;
1179         const char *name;
1180         };
1181
1182 struct chain_flags chain_flags_list[] =
1183         {
1184                 {CERT_PKEY_VALID, "Overall Validity"},
1185                 {CERT_PKEY_SIGN,  "Sign with EE key"},
1186                 {CERT_PKEY_EE_SIGNATURE, "EE signature"},
1187                 {CERT_PKEY_CA_SIGNATURE, "CA signature"},
1188                 {CERT_PKEY_EE_PARAM, "EE key parameters"},
1189                 {CERT_PKEY_CA_PARAM, "CA key parameters"},
1190                 {CERT_PKEY_EXPLICIT_SIGN,  "Explicity sign with EE key"},
1191                 {CERT_PKEY_ISSUER_NAME,  "Issuer Name"},
1192                 {CERT_PKEY_CERT_TYPE,  "Certificate Type"},
1193                 {0, NULL}
1194         };
1195
1196
1197 static void print_chain_flags(BIO *out, int flags)
1198         {
1199         struct chain_flags *ctmp = chain_flags_list;
1200         while(ctmp->name)
1201                 {
1202                 BIO_printf(out, "\t%s: %s\n", ctmp->name,
1203                                 flags & ctmp->flag ? "OK" : "NOT OK");
1204                 ctmp++;
1205                 }
1206         }
1207
1208 /* Very basic selection callback: just use any certificate chain
1209  * reported as valid. More sophisticated could prioritise according
1210  * to local policy.
1211  */
1212 static int set_cert_cb(SSL *ssl, void *arg)
1213         {
1214         int i, rv;
1215         SSL_EXCERT *exc = arg;
1216         SSL_certs_clear(ssl);
1217
1218         if (!exc)
1219                 return 1;
1220
1221         /* Go to end of list and traverse backwards since we prepend
1222          * newer entries this retains the original order.
1223          */
1224         while (exc->next)
1225                 exc = exc->next;
1226
1227         i = 0;  
1228
1229         while(exc)
1230                 {
1231                 i++;
1232                 rv = SSL_check_chain(ssl, exc->cert, exc->key, exc->chain);
1233                 BIO_printf(bio_err, "Checking cert chain %d:\nSubject: ", i);
1234                 X509_NAME_print_ex(bio_err, X509_get_subject_name(exc->cert), 0,
1235                                                         XN_FLAG_ONELINE);
1236                 BIO_puts(bio_err, "\n");
1237                 
1238                 print_chain_flags(bio_err, rv);
1239                 if (rv & CERT_PKEY_VALID)
1240                         {
1241                         SSL_use_certificate(ssl, exc->cert);
1242                         SSL_use_PrivateKey(ssl, exc->key);
1243                         /* NB: we wouldn't normally do this as it is
1244                          * not efficient building chains on each connection
1245                          * better to cache the chain in advance.
1246                          */
1247                         if (exc->build_chain)
1248                                 {
1249                                 if (!SSL_build_cert_chain(ssl, 0))
1250                                         return 0;
1251                                 }
1252                         else if (exc->chain)
1253                                 SSL_set1_chain(ssl, exc->chain);
1254                         }
1255                 exc = exc->prev;
1256                 }
1257         return 1;
1258         }
1259
1260 void ssl_ctx_set_excert(SSL_CTX *ctx, SSL_EXCERT *exc)
1261         {
1262         SSL_CTX_set_cert_cb(ctx, set_cert_cb, exc);
1263         }
1264
1265 static int ssl_excert_prepend(SSL_EXCERT **pexc)
1266         {
1267         SSL_EXCERT *exc;
1268         exc = OPENSSL_malloc(sizeof(SSL_EXCERT));
1269         if (!exc)
1270                 return 0;
1271         exc->certfile = NULL;
1272         exc->keyfile = NULL;
1273         exc->chainfile = NULL;
1274         exc->cert = NULL;
1275         exc->key = NULL;
1276         exc->chain = NULL;
1277         exc->prev = NULL;
1278         exc->build_chain = 0;
1279
1280         exc->next = *pexc;
1281         *pexc = exc;
1282                         
1283         if (exc->next)
1284                 {
1285                 exc->certform = exc->next->certform;
1286                 exc->keyform = exc->next->keyform;
1287                 exc->next->prev = exc;
1288                 }
1289         else
1290                 {
1291                 exc->certform = FORMAT_PEM;
1292                 exc->keyform = FORMAT_PEM;
1293                 }
1294         return 1;
1295
1296         }
1297
1298 void ssl_excert_free(SSL_EXCERT *exc)
1299         {
1300         SSL_EXCERT *curr;
1301         while (exc)
1302                 {
1303                 if (exc->cert)
1304                         X509_free(exc->cert);
1305                 if (exc->key)
1306                         EVP_PKEY_free(exc->key);
1307                 if (exc->chain)
1308                         sk_X509_pop_free(exc->chain, X509_free);
1309                 curr = exc;
1310                 exc = exc->next;
1311                 OPENSSL_free(curr);
1312                 }
1313         }
1314
1315 int load_excert(SSL_EXCERT **pexc, BIO *err)
1316         {
1317         SSL_EXCERT *exc = *pexc;
1318         if (!exc)
1319                 return 1;
1320         /* If nothing in list, free and set to NULL */
1321         if (!exc->certfile && !exc->next)
1322                 {
1323                 ssl_excert_free(exc);
1324                 *pexc = NULL;
1325                 return 1;
1326                 }
1327         for(; exc; exc=exc->next)
1328                 {
1329                 if (!exc->certfile)
1330                         {
1331                         BIO_printf(err, "Missing filename\n");
1332                         return 0;
1333                         }
1334                 exc->cert = load_cert(err, exc->certfile, exc->certform,
1335                                         NULL, NULL, "Server Certificate");
1336                 if (!exc->cert)
1337                         return 0;
1338                 if (exc->keyfile)
1339                         exc->keyfile = exc->certfile;
1340                 exc->key = load_key(err, exc->certfile, exc->certform, 0,
1341                                         NULL, NULL, "Server Certificate");
1342                 if (!exc->key)
1343                         return 0;
1344                 if (exc->chainfile)
1345                         {
1346                         exc->chain = load_certs(err,
1347                                                 exc->chainfile, FORMAT_PEM,
1348                                                 NULL, NULL,
1349                                                 "Server Chain");
1350                         if (!exc->chainfile)
1351                                 return 0;
1352                         }
1353                 }
1354         return 1;
1355         }
1356                 
1357
1358 int args_excert(char ***pargs, int *pargc,
1359                         int *badarg, BIO *err, SSL_EXCERT **pexc)
1360         {
1361         char *arg = **pargs, *argn = (*pargs)[1];
1362         SSL_EXCERT *exc = *pexc;
1363         int narg = 2;
1364         if (!exc)
1365                 {
1366                 if (ssl_excert_prepend(&exc))
1367                         *pexc = exc;
1368                 else
1369                         {
1370                         BIO_printf(err, "Error initialising xcert\n");
1371                         *badarg = 1;
1372                         goto err;
1373                         }
1374                 }
1375         if (strcmp(arg, "-xcert") == 0)
1376                 {
1377                 if (!argn)
1378                         {
1379                         *badarg = 1;
1380                         return 1;
1381                         }
1382                 if (exc->certfile && !ssl_excert_prepend(&exc))
1383                         {
1384                         BIO_printf(err, "Error adding xcert\n");
1385                         *badarg = 1;
1386                         goto err;
1387                         }
1388                 exc->certfile = argn;
1389                 }
1390         else if (strcmp(arg,"-xkey") == 0)
1391                 {
1392                 if (!argn)
1393                         {
1394                         *badarg = 1;
1395                         return 1;
1396                         }
1397                 if (exc->keyfile)
1398                         {
1399                         BIO_printf(err, "Key already specified\n");
1400                         *badarg = 1;
1401                         return 1;
1402                         }
1403                 exc->keyfile = argn;
1404                 }
1405         else if (strcmp(arg,"-xchain") == 0)
1406                 {
1407                 if (!argn)
1408                         {
1409                         *badarg = 1;
1410                         return 1;
1411                         }
1412                 if (exc->chainfile)
1413                         {
1414                         BIO_printf(err, "Chain already specified\n");
1415                         *badarg = 1;
1416                         return 1;
1417                         }
1418                 exc->chainfile = argn;
1419                 }
1420         else if (strcmp(arg,"-xchain_build") == 0)
1421                 {
1422                 narg = 1;
1423                 exc->build_chain = 1;
1424                 }
1425         else if (strcmp(arg,"-xcertform") == 0)
1426                 {
1427                 if (!argn)
1428                         {
1429                         *badarg = 1;
1430                         goto err;
1431                         }
1432                 exc->certform = str2fmt(argn);
1433                 }
1434         else if (strcmp(arg,"-xkeyform") == 0)
1435                 {
1436                 if (!argn)
1437                         {
1438                         *badarg = 1;
1439                         goto err;
1440                         }
1441                 exc->keyform = str2fmt(argn);
1442                 }
1443         else
1444                 return 0;
1445
1446         (*pargs) += narg;
1447
1448         if (pargc)
1449                 *pargc -= narg;
1450
1451         *pexc = exc;
1452
1453         return 1;
1454
1455         err:
1456         ERR_print_errors(err);
1457         ssl_excert_free(exc);
1458         *pexc = NULL;
1459         return 1;
1460         }
1461