ssl/s3_both.c

   1 /* ssl/s3_both.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  * ECC cipher suite support in OpenSSL originally developed by
 114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 115  */
 116
 117 #include <limits.h>
 118 #include <string.h>
 119 #include <stdio.h>
 120 #include "ssl_locl.h"
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/x509.h>
 126
 127 /*
 128  * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or
 129  * SSL3_RT_CHANGE_CIPHER_SPEC)
 130  */
 131 int ssl3_do_write(SSL *s, int type)
 132 {
 133     int ret;
 134
 135     ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off],
 136                            s->init_num);
 137     if (ret < 0)
 138         return (-1);
 139     if (type == SSL3_RT_HANDSHAKE)
 140         /*
 141          * should not be done for 'Hello Request's, but in that case we'll
 142          * ignore the result anyway
 143          */
 144         ssl3_finish_mac(s, (unsigned char *)&s->init_buf->data[s->init_off],
 145                         ret);
 146
 147     if (ret == s->init_num) {
 148         if (s->msg_callback)
 149             s->msg_callback(1, s->version, type, s->init_buf->data,
 150                             (size_t)(s->init_off + s->init_num), s,
 151                             s->msg_callback_arg);
 152         return (1);
 153     }
 154     s->init_off += ret;
 155     s->init_num -= ret;
 156     return (0);
 157 }
 158
 159 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 160 {
 161     unsigned char *p, *d;
 162     int i;
 163     unsigned long l;
 164
 165     if (s->state == a) {
 166         d = (unsigned char *)s->init_buf->data;
 167         p = &(d[4]);
 168
 169         i = s->method->ssl3_enc->final_finish_mac(s,
 170                                                   &(s->s3->finish_dgst1),
 171                                                   &(s->s3->finish_dgst2),
 172                                                   sender, slen,
 173                                                   s->s3->tmp.finish_md);
 174         s->s3->tmp.finish_md_len = i;
 175         memcpy(p, s->s3->tmp.finish_md, i);
 176         p += i;
 177         l = i;
 178
 179         /*
 180          * Copy the finished so we can use it for renegotiation checks
 181          */
 182         if (s->type == SSL_ST_CONNECT) {
 183             OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 184             memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md, i);
 185             s->s3->previous_client_finished_len = i;
 186         } else {
 187             OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 188             memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md, i);
 189             s->s3->previous_server_finished_len = i;
 190         }
 191
 192 #ifdef OPENSSL_SYS_WIN16
 193         /*
 194          * MSVC 1.5 does not clear the top bytes of the word unless I do
 195          * this.
 196          */
 197         l &= 0xffff;
 198 #endif
 199
 200         *(d++) = SSL3_MT_FINISHED;
 201         l2n3(l, d);
 202         s->init_num = (int)l + 4;
 203         s->init_off = 0;
 204
 205         s->state = b;
 206     }
 207
 208     /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 209     return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
 210 }
 211
 212 int ssl3_get_finished(SSL *s, int a, int b)
 213 {
 214     int al, i, ok;
 215     long n;
 216     unsigned char *p;
 217
 218     /*
 219      * the mac has already been generated when we received the change cipher
 220      * spec message and is in s->s3->tmp.peer_finish_md
 221      */
 222
 223     /* 64 argument should actually be 36+4 :-) */
 224     n = s->method->ssl_get_message(s, a, b, SSL3_MT_FINISHED, 64, &ok);
 225
 226     if (!ok)
 227         return ((int)n);
 228
 229     /* If this occurs, we have missed a message */
 230     if (!s->s3->change_cipher_spec) {
 231         al = SSL_AD_UNEXPECTED_MESSAGE;
 232         SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 233         goto f_err;
 234     }
 235     s->s3->change_cipher_spec = 0;
 236
 237     p = (unsigned char *)s->init_msg;
 238     i = s->s3->tmp.peer_finish_md_len;
 239
 240     if (i != n) {
 241         al = SSL_AD_DECODE_ERROR;
 242         SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_BAD_DIGEST_LENGTH);
 243         goto f_err;
 244     }
 245
 246     if (CRYPTO_memcmp(p, s->s3->tmp.peer_finish_md, i) != 0) {
 247         al = SSL_AD_DECRYPT_ERROR;
 248         SSLerr(SSL_F_SSL3_GET_FINISHED, SSL_R_DIGEST_CHECK_FAILED);
 249         goto f_err;
 250     }
 251
 252     /*
 253      * Copy the finished so we can use it for renegotiation checks
 254      */
 255     if (s->type == SSL_ST_ACCEPT) {
 256         OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 257         memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md, i);
 258         s->s3->previous_client_finished_len = i;
 259     } else {
 260         OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 261         memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md, i);
 262         s->s3->previous_server_finished_len = i;
 263     }
 264
 265     return (1);
 266  f_err:
 267     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 268     return (0);
 269 }
 270
 271 /*-
 272  * for these 2 messages, we need to
 273  * ssl->enc_read_ctx                    re-init
 274  * ssl->s3->read_sequence               zero
 275  * ssl->s3->read_mac_secret             re-init
 276  * ssl->session->read_sym_enc           assign
 277  * ssl->session->read_compression       assign
 278  * ssl->session->read_hash              assign
 279  */
 280 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 281 {
 282     unsigned char *p;
 283
 284     if (s->state == a) {
 285         p = (unsigned char *)s->init_buf->data;
 286         *p = SSL3_MT_CCS;
 287         s->init_num = 1;
 288         s->init_off = 0;
 289
 290         s->state = b;
 291     }
 292
 293     /* SSL3_ST_CW_CHANGE_B */
 294     return (ssl3_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC));
 295 }
 296
 297 static int ssl3_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
 298 {
 299     int n;
 300     unsigned char *p;
 301
 302     n = i2d_X509(x, NULL);
 303     if (!BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) {
 304         SSLerr(SSL_F_SSL3_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
 305         return (-1);
 306     }
 307     p = (unsigned char *)&(buf->data[*l]);
 308     l2n3(n, p);
 309     i2d_X509(x, &p);
 310     *l += n + 3;
 311
 312     return (0);
 313 }
 314
 315 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 316 {
 317     unsigned char *p;
 318     int i;
 319     unsigned long l = 7;
 320     BUF_MEM *buf;
 321     int no_chain;
 322
 323     if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
 324         no_chain = 1;
 325     else
 326         no_chain = 0;
 327
 328     /* TLSv1 sends a chain with nothing in it, instead of an alert */
 329     buf = s->init_buf;
 330     if (!BUF_MEM_grow_clean(buf, 10)) {
 331         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_BUF_LIB);
 332         return (0);
 333     }
 334     if (x != NULL) {
 335         if (no_chain) {
 336             if (ssl3_add_cert_to_buf(buf, &l, x))
 337                 return (0);
 338         } else {
 339             X509_STORE_CTX xs_ctx;
 340
 341             if (!X509_STORE_CTX_init(&xs_ctx, s->ctx->cert_store, x, NULL)) {
 342                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_X509_LIB);
 343                 return (0);
 344             }
 345             X509_verify_cert(&xs_ctx);
 346             /* Don't leave errors in the queue */
 347             ERR_clear_error();
 348             for (i = 0; i < sk_X509_num(xs_ctx.chain); i++) {
 349                 x = sk_X509_value(xs_ctx.chain, i);
 350
 351                 if (ssl3_add_cert_to_buf(buf, &l, x)) {
 352                     X509_STORE_CTX_cleanup(&xs_ctx);
 353                     return 0;
 354                 }
 355             }
 356             X509_STORE_CTX_cleanup(&xs_ctx);
 357         }
 358     }
 359     /* Thawte special :-) */
 360     for (i = 0; i < sk_X509_num(s->ctx->extra_certs); i++) {
 361         x = sk_X509_value(s->ctx->extra_certs, i);
 362         if (ssl3_add_cert_to_buf(buf, &l, x))
 363             return (0);
 364     }
 365
 366     l -= 7;
 367     p = (unsigned char *)&(buf->data[4]);
 368     l2n3(l, p);
 369     l += 3;
 370     p = (unsigned char *)&(buf->data[0]);
 371     *(p++) = SSL3_MT_CERTIFICATE;
 372     l2n3(l, p);
 373     l += 4;
 374     return (l);
 375 }
 376
 377 /*
 378  * Obtain handshake message of message type 'mt' (any if mt == -1), maximum
 379  * acceptable body length 'max'. The first four bytes (msg_type and length)
 380  * are read in state 'st1', the body is read in state 'stn'.
 381  */
 382 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 383 {
 384     unsigned char *p;
 385     unsigned long l;
 386     long n;
 387     int i, al;
 388
 389     if (s->s3->tmp.reuse_message) {
 390         s->s3->tmp.reuse_message = 0;
 391         if ((mt >= 0) && (s->s3->tmp.message_type != mt)) {
 392             al = SSL_AD_UNEXPECTED_MESSAGE;
 393             SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
 394             goto f_err;
 395         }
 396         *ok = 1;
 397         s->init_msg = s->init_buf->data + 4;
 398         s->init_num = (int)s->s3->tmp.message_size;
 399         return s->init_num;
 400     }
 401
 402     p = (unsigned char *)s->init_buf->data;
 403
 404     if (s->state == st1) {      /* s->init_num < 4 */
 405         int skip_message;
 406
 407         do {
 408             while (s->init_num < 4) {
 409                 i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
 410                                               &p[s->init_num],
 411                                               4 - s->init_num, 0);
 412                 if (i <= 0) {
 413                     s->rwstate = SSL_READING;
 414                     *ok = 0;
 415                     return i;
 416                 }
 417                 s->init_num += i;
 418             }
 419
 420             skip_message = 0;
 421             if (!s->server)
 422                 if (p[0] == SSL3_MT_HELLO_REQUEST)
 423                     /*
 424                      * The server may always send 'Hello Request' messages --
 425                      * we are doing a handshake anyway now, so ignore them if
 426                      * their format is correct. Does not count for 'Finished'
 427                      * MAC.
 428                      */
 429                     if (p[1] == 0 && p[2] == 0 && p[3] == 0) {
 430                         s->init_num = 0;
 431                         skip_message = 1;
 432
 433                         if (s->msg_callback)
 434                             s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
 435                                             p, 4, s, s->msg_callback_arg);
 436                     }
 437         }
 438         while (skip_message);
 439
 440         /* s->init_num == 4 */
 441
 442         if ((mt >= 0) && (*p != mt)) {
 443             al = SSL_AD_UNEXPECTED_MESSAGE;
 444             SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
 445             goto f_err;
 446         }
 447         if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 448             (st1 == SSL3_ST_SR_CERT_A) && (stn == SSL3_ST_SR_CERT_B)) {
 449             /*
 450              * At this point we have got an MS SGC second client hello (maybe
 451              * we should always allow the client to start a new handshake?).
 452              * We need to restart the mac. Don't increment
 453              * {num,total}_renegotiations because we have not completed the
 454              * handshake.
 455              */
 456             ssl3_init_finished_mac(s);
 457         }
 458
 459         s->s3->tmp.message_type = *(p++);
 460
 461         n2l3(p, l);
 462         if (l > (unsigned long)max) {
 463             al = SSL_AD_ILLEGAL_PARAMETER;
 464             SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE);
 465             goto f_err;
 466         }
 467         if (l > (INT_MAX - 4)) { /* BUF_MEM_grow takes an 'int' parameter */
 468             al = SSL_AD_ILLEGAL_PARAMETER;
 469             SSLerr(SSL_F_SSL3_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE);
 470             goto f_err;
 471         }
 472         if (l && !BUF_MEM_grow_clean(s->init_buf, (int)l + 4)) {
 473             SSLerr(SSL_F_SSL3_GET_MESSAGE, ERR_R_BUF_LIB);
 474             goto err;
 475         }
 476         s->s3->tmp.message_size = l;
 477         s->state = stn;
 478
 479         s->init_msg = s->init_buf->data + 4;
 480         s->init_num = 0;
 481     }
 482
 483     /* next state (stn) */
 484     p = s->init_msg;
 485     n = s->s3->tmp.message_size - s->init_num;
 486     while (n > 0) {
 487         i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &p[s->init_num],
 488                                       n, 0);
 489         if (i <= 0) {
 490             s->rwstate = SSL_READING;
 491             *ok = 0;
 492             return i;
 493         }
 494         s->init_num += i;
 495         n -= i;
 496     }
 497     ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
 498     if (s->msg_callback)
 499         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data,
 500                         (size_t)s->init_num + 4, s, s->msg_callback_arg);
 501     *ok = 1;
 502     return s->init_num;
 503  f_err:
 504     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 505  err:
 506     *ok = 0;
 507     return (-1);
 508 }
 509
 510 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 511 {
 512     EVP_PKEY *pk;
 513     int ret = -1, i;
 514
 515     if (pkey == NULL)
 516         pk = X509_get_pubkey(x);
 517     else
 518         pk = pkey;
 519     if (pk == NULL)
 520         goto err;
 521
 522     i = pk->type;
 523     if (i == EVP_PKEY_RSA) {
 524         ret = SSL_PKEY_RSA_ENC;
 525     } else if (i == EVP_PKEY_DSA) {
 526         ret = SSL_PKEY_DSA_SIGN;
 527     }
 528 #ifndef OPENSSL_NO_EC
 529     else if (i == EVP_PKEY_EC) {
 530         ret = SSL_PKEY_ECC;
 531     }
 532 #endif
 533
 534  err:
 535     if (!pkey)
 536         EVP_PKEY_free(pk);
 537     return (ret);
 538 }
 539
 540 int ssl_verify_alarm_type(long type)
 541 {
 542     int al;
 543
 544     switch (type) {
 545     case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 546     case X509_V_ERR_UNABLE_TO_GET_CRL:
 547     case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
 548         al = SSL_AD_UNKNOWN_CA;
 549         break;
 550     case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 551     case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 552     case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 553     case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 554     case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 555     case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 556     case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 557     case X509_V_ERR_CERT_NOT_YET_VALID:
 558     case X509_V_ERR_CRL_NOT_YET_VALID:
 559     case X509_V_ERR_CERT_UNTRUSTED:
 560     case X509_V_ERR_CERT_REJECTED:
 561         al = SSL_AD_BAD_CERTIFICATE;
 562         break;
 563     case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 564     case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 565         al = SSL_AD_DECRYPT_ERROR;
 566         break;
 567     case X509_V_ERR_CERT_HAS_EXPIRED:
 568     case X509_V_ERR_CRL_HAS_EXPIRED:
 569         al = SSL_AD_CERTIFICATE_EXPIRED;
 570         break;
 571     case X509_V_ERR_CERT_REVOKED:
 572         al = SSL_AD_CERTIFICATE_REVOKED;
 573         break;
 574     case X509_V_ERR_OUT_OF_MEM:
 575         al = SSL_AD_INTERNAL_ERROR;
 576         break;
 577     case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 578     case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 579     case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 580     case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 581     case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 582     case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 583     case X509_V_ERR_INVALID_CA:
 584         al = SSL_AD_UNKNOWN_CA;
 585         break;
 586     case X509_V_ERR_APPLICATION_VERIFICATION:
 587         al = SSL_AD_HANDSHAKE_FAILURE;
 588         break;
 589     case X509_V_ERR_INVALID_PURPOSE:
 590         al = SSL_AD_UNSUPPORTED_CERTIFICATE;
 591         break;
 592     default:
 593         al = SSL_AD_CERTIFICATE_UNKNOWN;
 594         break;
 595     }
 596     return (al);
 597 }
 598
 599 int ssl3_setup_buffers(SSL *s)
 600 {
 601     unsigned char *p;
 602     unsigned int extra, headerlen;
 603     size_t len;
 604
 605     if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 606         headerlen = DTLS1_RT_HEADER_LENGTH;
 607     else
 608         headerlen = SSL3_RT_HEADER_LENGTH;
 609
 610     if (s->s3->rbuf.buf == NULL) {
 611         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 612             extra = SSL3_RT_MAX_EXTRA;
 613         else
 614             extra = 0;
 615         len = SSL3_RT_MAX_PACKET_SIZE + extra;
 616         if ((p = OPENSSL_malloc(len)) == NULL)
 617             goto err;
 618         s->s3->rbuf.buf = p;
 619         s->s3->rbuf.len = len;
 620     }
 621
 622     if (s->s3->wbuf.buf == NULL) {
 623         len = SSL3_RT_MAX_PACKET_SIZE;
 624         len += headerlen + 256; /* extra space for empty fragment */
 625         if ((p = OPENSSL_malloc(len)) == NULL)
 626             goto err;
 627         s->s3->wbuf.buf = p;
 628         s->s3->wbuf.len = len;
 629     }
 630     s->packet = &(s->s3->rbuf.buf[0]);
 631     return (1);
 632  err:
 633     SSLerr(SSL_F_SSL3_SETUP_BUFFERS, ERR_R_MALLOC_FAILURE);
 634     return (0);
 635 }