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         {
 255         if (cert ==  NULL)
 256                 return 1;
 257         if (SSL_CTX_use_certificate(ctx,cert) <= 0)
 258                 {
 259                 BIO_printf(bio_err,"error setting certificate\n");
 260                 ERR_print_errors(bio_err);
 261                 return 0;
 262                 }
 263         if (SSL_CTX_use_PrivateKey(ctx,key) <= 0)
 264                 {
 265                 BIO_printf(bio_err,"error setting private key\n");
 266                 ERR_print_errors(bio_err);
 267                 return 0;
 268                 }
 269
 270
 271                 /* Now we know that a key and cert have been set against
 272                  * the SSL context */
 273         if (!SSL_CTX_check_private_key(ctx))
 274                 {
 275                 BIO_printf(bio_err,"Private key does not match the certificate public key\n");
 276                 return 0;
 277                 }
 278         return 1;
 279         }
 280
 281 long MS_CALLBACK bio_dump_callback(BIO *bio, int cmd, const char *argp,
 282                                    int argi, long argl, long ret)
 283         {
 284         BIO *out;
 285
 286         out=(BIO *)BIO_get_callback_arg(bio);
 287         if (out == NULL) return(ret);
 288
 289         if (cmd == (BIO_CB_READ|BIO_CB_RETURN))
 290                 {
 291                 BIO_printf(out,"read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
 292                         (void *)bio,argp,(unsigned long)argi,ret,ret);
 293                 BIO_dump(out,argp,(int)ret);
 294                 return(ret);
 295                 }
 296         else if (cmd == (BIO_CB_WRITE|BIO_CB_RETURN))
 297                 {
 298                 BIO_printf(out,"write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
 299                         (void *)bio,argp,(unsigned long)argi,ret,ret);
 300                 BIO_dump(out,argp,(int)ret);
 301                 }
 302         return(ret);
 303         }
 304
 305 void MS_CALLBACK apps_ssl_info_callback(const SSL *s, int where, int ret)
 306         {
 307         const char *str;
 308         int w;
 309
 310         w=where& ~SSL_ST_MASK;
 311
 312         if (w & SSL_ST_CONNECT) str="SSL_connect";
 313         else if (w & SSL_ST_ACCEPT) str="SSL_accept";
 314         else str="undefined";
 315
 316         if (where & SSL_CB_LOOP)
 317                 {
 318                 BIO_printf(bio_err,"%s:%s\n",str,SSL_state_string_long(s));
 319                 }
 320         else if (where & SSL_CB_ALERT)
 321                 {
 322                 str=(where & SSL_CB_READ)?"read":"write";
 323                 BIO_printf(bio_err,"SSL3 alert %s:%s:%s\n",
 324                         str,
 325                         SSL_alert_type_string_long(ret),
 326                         SSL_alert_desc_string_long(ret));
 327                 }
 328         else if (where & SSL_CB_EXIT)
 329                 {
 330                 if (ret == 0)
 331                         BIO_printf(bio_err,"%s:failed in %s\n",
 332                                 str,SSL_state_string_long(s));
 333                 else if (ret < 0)
 334                         {
 335                         BIO_printf(bio_err,"%s:error in %s\n",
 336                                 str,SSL_state_string_long(s));
 337                         }
 338                 }
 339         }
 340
 341
 342 void MS_CALLBACK msg_cb(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)
 343         {
 344         BIO *bio = arg;
 345         const char *str_write_p, *str_version, *str_content_type = "", *str_details1 = "", *str_details2= "";
 346
 347         str_write_p = write_p ? ">>>" : "<<<";
 348
 349         switch (version)
 350                 {
 351         case SSL2_VERSION:
 352                 str_version = "SSL 2.0";
 353                 break;
 354         case SSL3_VERSION:
 355                 str_version = "SSL 3.0 ";
 356                 break;
 357         case TLS1_VERSION:
 358                 str_version = "TLS 1.0 ";
 359                 break;
 360         case DTLS1_VERSION:
 361                 str_version = "DTLS 1.0 ";
 362                 break;
 363         case DTLS1_BAD_VER:
 364                 str_version = "DTLS 1.0 (bad) ";
 365                 break;
 366         default:
 367                 str_version = "???";
 368                 }
 369
 370         if (version == SSL2_VERSION)
 371                 {
 372                 str_details1 = "???";
 373
 374                 if (len > 0)
 375                         {
 376                         switch (((const unsigned char*)buf)[0])
 377                                 {
 378                                 case 0:
 379                                         str_details1 = ", ERROR:";
 380                                         str_details2 = " ???";
 381                                         if (len >= 3)
 382                                                 {
 383                                                 unsigned err = (((const unsigned char*)buf)[1]<<8) + ((const unsigned char*)buf)[2];
 384
 385                                                 switch (err)
 386                                                         {
 387                                                 case 0x0001:
 388                                                         str_details2 = " NO-CIPHER-ERROR";
 389                                                         break;
 390                                                 case 0x0002:
 391                                                         str_details2 = " NO-CERTIFICATE-ERROR";
 392                                                         break;
 393                                                 case 0x0004:
 394                                                         str_details2 = " BAD-CERTIFICATE-ERROR";
 395                                                         break;
 396                                                 case 0x0006:
 397                                                         str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
 398                                                         break;
 399                                                         }
 400                                                 }
 401
 402                                         break;
 403                                 case 1:
 404                                         str_details1 = ", CLIENT-HELLO";
 405                                         break;
 406                                 case 2:
 407                                         str_details1 = ", CLIENT-MASTER-KEY";
 408                                         break;
 409                                 case 3:
 410                                         str_details1 = ", CLIENT-FINISHED";
 411                                         break;
 412                                 case 4:
 413                                         str_details1 = ", SERVER-HELLO";
 414                                         break;
 415                                 case 5:
 416                                         str_details1 = ", SERVER-VERIFY";
 417                                         break;
 418                                 case 6:
 419                                         str_details1 = ", SERVER-FINISHED";
 420                                         break;
 421                                 case 7:
 422                                         str_details1 = ", REQUEST-CERTIFICATE";
 423                                         break;
 424                                 case 8:
 425                                         str_details1 = ", CLIENT-CERTIFICATE";
 426                                         break;
 427                                 }
 428                         }
 429                 }
 430
 431         if (version == SSL3_VERSION ||
 432             version == TLS1_VERSION ||
 433             version == DTLS1_VERSION ||
 434             version == DTLS1_BAD_VER)
 435                 {
 436                 switch (content_type)
 437                         {
 438                 case 20:
 439                         str_content_type = "ChangeCipherSpec";
 440                         break;
 441                 case 21:
 442                         str_content_type = "Alert";
 443                         break;
 444                 case 22:
 445                         str_content_type = "Handshake";
 446                         break;
 447                         }
 448
 449                 if (content_type == 21) /* Alert */
 450                         {
 451                         str_details1 = ", ???";
 452
 453                         if (len == 2)
 454                                 {
 455                                 switch (((const unsigned char*)buf)[0])
 456                                         {
 457                                 case 1:
 458                                         str_details1 = ", warning";
 459                                         break;
 460                                 case 2:
 461                                         str_details1 = ", fatal";
 462                                         break;
 463                                         }
 464
 465                                 str_details2 = " ???";
 466                                 switch (((const unsigned char*)buf)[1])
 467                                         {
 468                                 case 0:
 469                                         str_details2 = " close_notify";
 470                                         break;
 471                                 case 10:
 472                                         str_details2 = " unexpected_message";
 473                                         break;
 474                                 case 20:
 475                                         str_details2 = " bad_record_mac";
 476                                         break;
 477                                 case 21:
 478                                         str_details2 = " decryption_failed";
 479                                         break;
 480                                 case 22:
 481                                         str_details2 = " record_overflow";
 482                                         break;
 483                                 case 30:
 484                                         str_details2 = " decompression_failure";
 485                                         break;
 486                                 case 40:
 487                                         str_details2 = " handshake_failure";
 488                                         break;
 489                                 case 42:
 490                                         str_details2 = " bad_certificate";
 491                                         break;
 492                                 case 43:
 493                                         str_details2 = " unsupported_certificate";
 494                                         break;
 495                                 case 44:
 496                                         str_details2 = " certificate_revoked";
 497                                         break;
 498                                 case 45:
 499                                         str_details2 = " certificate_expired";
 500                                         break;
 501                                 case 46:
 502                                         str_details2 = " certificate_unknown";
 503                                         break;
 504                                 case 47:
 505                                         str_details2 = " illegal_parameter";
 506                                         break;
 507                                 case 48:
 508                                         str_details2 = " unknown_ca";
 509                                         break;
 510                                 case 49:
 511                                         str_details2 = " access_denied";
 512                                         break;
 513                                 case 50:
 514                                         str_details2 = " decode_error";
 515                                         break;
 516                                 case 51:
 517                                         str_details2 = " decrypt_error";
 518                                         break;
 519                                 case 60:
 520                                         str_details2 = " export_restriction";
 521                                         break;
 522                                 case 70:
 523                                         str_details2 = " protocol_version";
 524                                         break;
 525                                 case 71:
 526                                         str_details2 = " insufficient_security";
 527                                         break;
 528                                 case 80:
 529                                         str_details2 = " internal_error";
 530                                         break;
 531                                 case 90:
 532                                         str_details2 = " user_canceled";
 533                                         break;
 534                                 case 100:
 535                                         str_details2 = " no_renegotiation";
 536                                         break;
 537                                 case 110:
 538                                         str_details2 = " unsupported_extension";
 539                                         break;
 540                                 case 111:
 541                                         str_details2 = " certificate_unobtainable";
 542                                         break;
 543                                 case 112:
 544                                         str_details2 = " unrecognized_name";
 545                                         break;
 546                                 case 113:
 547                                         str_details2 = " bad_certificate_status_response";
 548                                         break;
 549                                 case 114:
 550                                         str_details2 = " bad_certificate_hash_value";
 551                                         break;
 552                                         }
 553                                 }
 554                         }
 555
 556                 if (content_type == 22) /* Handshake */
 557                         {
 558                         str_details1 = "???";
 559
 560                         if (len > 0)
 561                                 {
 562                                 switch (((const unsigned char*)buf)[0])
 563                                         {
 564                                 case 0:
 565                                         str_details1 = ", HelloRequest";
 566                                         break;
 567                                 case 1:
 568                                         str_details1 = ", ClientHello";
 569                                         break;
 570                                 case 2:
 571                                         str_details1 = ", ServerHello";
 572                                         break;
 573                                 case 3:
 574                                         str_details1 = ", HelloVerifyRequest";
 575                                         break;
 576                                 case 11:
 577                                         str_details1 = ", Certificate";
 578                                         break;
 579                                 case 12:
 580                                         str_details1 = ", ServerKeyExchange";
 581                                         break;
 582                                 case 13:
 583                                         str_details1 = ", CertificateRequest";
 584                                         break;
 585                                 case 14:
 586                                         str_details1 = ", ServerHelloDone";
 587                                         break;
 588                                 case 15:
 589                                         str_details1 = ", CertificateVerify";
 590                                         break;
 591                                 case 16:
 592                                         str_details1 = ", ClientKeyExchange";
 593                                         break;
 594                                 case 20:
 595                                         str_details1 = ", Finished";
 596                                         break;
 597                                         }
 598                                 }
 599                         }
 600                 }
 601
 602         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);
 603
 604         if (len > 0)
 605                 {
 606                 size_t num, i;
 607
 608                 BIO_printf(bio, "   ");
 609                 num = len;
 610 #if 0
 611                 if (num > 16)
 612                         num = 16;
 613 #endif
 614                 for (i = 0; i < num; i++)
 615                         {
 616                         if (i % 16 == 0 && i > 0)
 617                                 BIO_printf(bio, "\n   ");
 618                         BIO_printf(bio, " %02x", ((const unsigned char*)buf)[i]);
 619                         }
 620                 if (i < len)
 621                         BIO_printf(bio, " ...");
 622                 BIO_printf(bio, "\n");
 623                 }
 624         (void)BIO_flush(bio);
 625         }
 626
 627 void MS_CALLBACK tlsext_cb(SSL *s, int client_server, int type,
 628                                         unsigned char *data, int len,
 629                                         void *arg)
 630         {
 631         BIO *bio = arg;
 632         char *extname;
 633
 634         switch(type)
 635                 {
 636                 case TLSEXT_TYPE_server_name:
 637                 extname = "server name";
 638                 break;
 639
 640                 case TLSEXT_TYPE_max_fragment_length:
 641                 extname = "max fragment length";
 642                 break;
 643
 644                 case TLSEXT_TYPE_client_certificate_url:
 645                 extname = "client certificate URL";
 646                 break;
 647
 648                 case TLSEXT_TYPE_trusted_ca_keys:
 649                 extname = "trusted CA keys";
 650                 break;
 651
 652                 case TLSEXT_TYPE_truncated_hmac:
 653                 extname = "truncated HMAC";
 654                 break;
 655
 656                 case TLSEXT_TYPE_status_request:
 657                 extname = "status request";
 658                 break;
 659
 660                 case TLSEXT_TYPE_elliptic_curves:
 661                 extname = "elliptic curves";
 662                 break;
 663
 664                 case TLSEXT_TYPE_ec_point_formats:
 665                 extname = "EC point formats";
 666                 break;
 667
 668                 case TLSEXT_TYPE_session_ticket:
 669                 extname = "server ticket";
 670                 break;
 671
 672 #ifdef TLSEXT_TYPE_opaque_prf_input
 673                 case TLSEXT_TYPE_opaque_prf_input:
 674                 extname = "opaque PRF input";
 675                 break;
 676 #endif
 677
 678                 default:
 679                 extname = "unknown";
 680                 break;
 681
 682                 }
 683
 684         BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
 685                         client_server ? "server": "client",
 686                         extname, type, len);
 687         BIO_dump(bio, (char *)data, len);
 688         (void)BIO_flush(bio);
 689         }
 690
 691 int MS_CALLBACK generate_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)
 692         {
 693         unsigned char *buffer, result[EVP_MAX_MD_SIZE];
 694         unsigned int length, resultlength;
 695         struct sockaddr_in peer;
 696
 697         /* Initialize a random secret */
 698         if (!cookie_initialized)
 699                 {
 700                 if (!RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH))
 701                         {
 702                         BIO_printf(bio_err,"error setting random cookie secret\n");
 703                         return 0;
 704                         }
 705                 cookie_initialized = 1;
 706                 }
 707
 708         /* Read peer information */
 709         (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
 710
 711         /* Create buffer with peer's address and port */
 712         length = sizeof(peer.sin_addr);
 713         length += sizeof(peer.sin_port);
 714         buffer = OPENSSL_malloc(length);
 715
 716         if (buffer == NULL)
 717                 {
 718                 BIO_printf(bio_err,"out of memory\n");
 719                 return 0;
 720                 }
 721
 722         memcpy(buffer, &peer.sin_addr, sizeof(peer.sin_addr));
 723         memcpy(buffer + sizeof(peer.sin_addr), &peer.sin_port, sizeof(peer.sin_port));
 724
 725         /* Calculate HMAC of buffer using the secret */
 726         HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
 727              buffer, length, result, &resultlength);
 728         OPENSSL_free(buffer);
 729
 730         memcpy(cookie, result, resultlength);
 731         *cookie_len = resultlength;
 732
 733         return 1;
 734         }
 735
 736 int MS_CALLBACK verify_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)
 737         {
 738         unsigned char *buffer, result[EVP_MAX_MD_SIZE];
 739         unsigned int length, resultlength;
 740         struct sockaddr_in peer;
 741
 742         /* If secret isn't initialized yet, the cookie can't be valid */
 743         if (!cookie_initialized)
 744                 return 0;
 745
 746         /* Read peer information */
 747         (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
 748
 749         /* Create buffer with peer's address and port */
 750         length = sizeof(peer.sin_addr);
 751         length += sizeof(peer.sin_port);
 752         buffer = OPENSSL_malloc(length);
 753
 754         if (buffer == NULL)
 755                 {
 756                 BIO_printf(bio_err,"out of memory\n");
 757                 return 0;
 758                 }
 759
 760         memcpy(buffer, &peer.sin_addr, sizeof(peer.sin_addr));
 761         memcpy(buffer + sizeof(peer.sin_addr), &peer.sin_port, sizeof(peer.sin_port));
 762
 763         /* Calculate HMAC of buffer using the secret */
 764         HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
 765              buffer, length, result, &resultlength);
 766         OPENSSL_free(buffer);
 767
 768         if (cookie_len == resultlength && memcmp(result, cookie, resultlength) == 0)
 769                 return 1;
 770
 771         return 0;
 772         }