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 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
 128 int ssl3_do_write(SSL *s, int type)
 129         {
 130         int ret;
 131
 132         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
 133                              s->init_num);
 134         if (ret < 0) return(-1);
 135         if (type == SSL3_RT_HANDSHAKE)
 136                 /* should not be done for 'Hello Request's, but in that case
 137                  * we'll ignore the result anyway */
 138                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
 139
 140         if (ret == s->init_num)
 141                 {
 142                 if (s->msg_callback)
 143                         s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
 144                 return(1);
 145                 }
 146         s->init_off+=ret;
 147         s->init_num-=ret;
 148         return(0);
 149         }
 150
 151 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 152         {
 153         unsigned char *p;
 154         int i;
 155         unsigned long l;
 156
 157         if (s->state == a)
 158                 {
 159                 p = ssl_handshake_start(s);
 160
 161                 i=s->method->ssl3_enc->final_finish_mac(s,
 162                         sender,slen,s->s3->tmp.finish_md);
 163                 if (i == 0)
 164                         return 0;
 165                 s->s3->tmp.finish_md_len = i;
 166                 memcpy(p, s->s3->tmp.finish_md, i);
 167                 l=i;
 168
 169                 /* Copy the finished so we can use it for
 170                    renegotiation checks */
 171                 if(s->type == SSL_ST_CONNECT)
 172                         {
 173                          OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 174                          memcpy(s->s3->previous_client_finished,
 175                              s->s3->tmp.finish_md, i);
 176                          s->s3->previous_client_finished_len=i;
 177                         }
 178                 else
 179                         {
 180                         OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 181                         memcpy(s->s3->previous_server_finished,
 182                             s->s3->tmp.finish_md, i);
 183                         s->s3->previous_server_finished_len=i;
 184                         }
 185
 186                 ssl_set_handshake_header(s, SSL3_MT_FINISHED, l);
 187                 s->state=b;
 188                 }
 189
 190         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 191         return ssl_do_write(s);
 192         }
 193
 194 #ifndef OPENSSL_NO_NEXTPROTONEG
 195 /* ssl3_take_mac calculates the Finished MAC for the handshakes messages seen to far. */
 196 static void ssl3_take_mac(SSL *s)
 197         {
 198         const char *sender;
 199         int slen;
 200         /* If no new cipher setup return immediately: other functions will
 201          * set the appropriate error.
 202          */
 203         if (s->s3->tmp.new_cipher == NULL)
 204                 return;
 205         if (s->state & SSL_ST_CONNECT)
 206                 {
 207                 sender=s->method->ssl3_enc->server_finished_label;
 208                 slen=s->method->ssl3_enc->server_finished_label_len;
 209                 }
 210         else
 211                 {
 212                 sender=s->method->ssl3_enc->client_finished_label;
 213                 slen=s->method->ssl3_enc->client_finished_label_len;
 214                 }
 215
 216         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
 217                 sender,slen,s->s3->tmp.peer_finish_md);
 218         }
 219 #endif
 220
 221 int ssl3_get_finished(SSL *s, int a, int b)
 222         {
 223         int al,i,ok;
 224         long n;
 225         unsigned char *p;
 226
 227 #ifdef OPENSSL_NO_NEXTPROTONEG
 228         /* the mac has already been generated when we received the
 229          * change cipher spec message and is in s->s3->tmp.peer_finish_md
 230          */
 231 #endif
 232
 233         /* 64 argument should actually be 36+4 :-) */
 234         n=s->method->ssl_get_message(s,
 235                 a,
 236                 b,
 237                 SSL3_MT_FINISHED,
 238                 64,
 239                 &ok);
 240
 241         if (!ok) return((int)n);
 242
 243         /* If this occurs, we have missed a message */
 244         if (!s->s3->change_cipher_spec)
 245                 {
 246                 al=SSL_AD_UNEXPECTED_MESSAGE;
 247                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 248                 goto f_err;
 249                 }
 250         s->s3->change_cipher_spec=0;
 251
 252         p = (unsigned char *)s->init_msg;
 253         i = s->s3->tmp.peer_finish_md_len;
 254
 255         if (i != n)
 256                 {
 257                 al=SSL_AD_DECODE_ERROR;
 258                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 259                 goto f_err;
 260                 }
 261
 262         if (CRYPTO_memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
 263                 {
 264                 al=SSL_AD_DECRYPT_ERROR;
 265                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 266                 goto f_err;
 267                 }
 268
 269         /* Copy the finished so we can use it for
 270            renegotiation checks */
 271         if(s->type == SSL_ST_ACCEPT)
 272                 {
 273                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 274                 memcpy(s->s3->previous_client_finished,
 275                     s->s3->tmp.peer_finish_md, i);
 276                 s->s3->previous_client_finished_len=i;
 277                 }
 278         else
 279                 {
 280                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 281                 memcpy(s->s3->previous_server_finished,
 282                     s->s3->tmp.peer_finish_md, i);
 283                 s->s3->previous_server_finished_len=i;
 284                 }
 285
 286         return(1);
 287 f_err:
 288         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 289         return(0);
 290         }
 291
 292 /*-
 293  * for these 2 messages, we need to
 294  * ssl->enc_read_ctx                    re-init
 295  * ssl->s3->read_sequence               zero
 296  * ssl->s3->read_mac_secret             re-init
 297  * ssl->session->read_sym_enc           assign
 298  * ssl->session->read_compression       assign
 299  * ssl->session->read_hash              assign
 300  */
 301 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 302         {
 303         unsigned char *p;
 304
 305         if (s->state == a)
 306                 {
 307                 p=(unsigned char *)s->init_buf->data;
 308                 *p=SSL3_MT_CCS;
 309                 s->init_num=1;
 310                 s->init_off=0;
 311
 312                 s->state=b;
 313                 }
 314
 315         /* SSL3_ST_CW_CHANGE_B */
 316         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 317         }
 318
 319 unsigned long ssl3_output_cert_chain(SSL *s, CERT_PKEY *cpk)
 320         {
 321         unsigned char *p;
 322         unsigned long l = 3 + SSL_HM_HEADER_LENGTH(s);
 323
 324         if (!ssl_add_cert_chain(s, cpk, &l))
 325                 return 0;
 326
 327         l -= 3 + SSL_HM_HEADER_LENGTH(s);
 328         p = ssl_handshake_start(s);
 329         l2n3(l,p);
 330         l += 3;
 331         ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE, l);
 332         return l + SSL_HM_HEADER_LENGTH(s);
 333         }
 334
 335 /* Obtain handshake message of message type 'mt' (any if mt == -1),
 336  * maximum acceptable body length 'max'.
 337  * The first four bytes (msg_type and length) are read in state 'st1',
 338  * the body is read in state 'stn'.
 339  */
 340 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 341         {
 342         unsigned char *p;
 343         unsigned long l;
 344         long n;
 345         int i,al;
 346
 347         if (s->s3->tmp.reuse_message)
 348                 {
 349                 s->s3->tmp.reuse_message=0;
 350                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
 351                         {
 352                         al=SSL_AD_UNEXPECTED_MESSAGE;
 353                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 354                         goto f_err;
 355                         }
 356                 *ok=1;
 357                 s->state = stn;
 358                 s->init_msg = s->init_buf->data + 4;
 359                 s->init_num = (int)s->s3->tmp.message_size;
 360                 return s->init_num;
 361                 }
 362
 363         p=(unsigned char *)s->init_buf->data;
 364
 365         if (s->state == st1) /* s->init_num < 4 */
 366                 {
 367                 int skip_message;
 368
 369                 do
 370                         {
 371                         while (s->init_num < 4)
 372                                 {
 373                                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
 374                                         &p[s->init_num],4 - s->init_num, 0);
 375                                 if (i <= 0)
 376                                         {
 377                                         s->rwstate=SSL_READING;
 378                                         *ok = 0;
 379                                         return i;
 380                                         }
 381                                 s->init_num+=i;
 382                                 }
 383
 384                         skip_message = 0;
 385                         if (!s->server)
 386                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
 387                                         /* The server may always send 'Hello Request' messages --
 388                                          * we are doing a handshake anyway now, so ignore them
 389                                          * if their format is correct. Does not count for
 390                                          * 'Finished' MAC. */
 391                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
 392                                                 {
 393                                                 s->init_num = 0;
 394                                                 skip_message = 1;
 395
 396                                                 if (s->msg_callback)
 397                                                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
 398                                                 }
 399                         }
 400                 while (skip_message);
 401
 402                 /* s->init_num == 4 */
 403
 404                 if ((mt >= 0) && (*p != mt))
 405                         {
 406                         al=SSL_AD_UNEXPECTED_MESSAGE;
 407                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 408                         goto f_err;
 409                         }
 410
 411                 s->s3->tmp.message_type= *(p++);
 412
 413                 n2l3(p,l);
 414                 if (l > (unsigned long)max)
 415                         {
 416                         al=SSL_AD_ILLEGAL_PARAMETER;
 417                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 418                         goto f_err;
 419                         }
 420                 if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
 421                         {
 422                         al=SSL_AD_ILLEGAL_PARAMETER;
 423                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 424                         goto f_err;
 425                         }
 426                 if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))
 427                         {
 428                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 429                         goto err;
 430                         }
 431                 s->s3->tmp.message_size=l;
 432                 s->state=stn;
 433
 434                 s->init_msg = s->init_buf->data + 4;
 435                 s->init_num = 0;
 436                 }
 437
 438         /* next state (stn) */
 439         p = s->init_msg;
 440         n = s->s3->tmp.message_size - s->init_num;
 441         while (n > 0)
 442                 {
 443                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
 444                 if (i <= 0)
 445                         {
 446                         s->rwstate=SSL_READING;
 447                         *ok = 0;
 448                         return i;
 449                         }
 450                 s->init_num += i;
 451                 n -= i;
 452                 }
 453
 454 #ifndef OPENSSL_NO_NEXTPROTONEG
 455         /* If receiving Finished, record MAC of prior handshake messages for
 456          * Finished verification. */
 457         if (*s->init_buf->data == SSL3_MT_FINISHED)
 458                 ssl3_take_mac(s);
 459 #endif
 460
 461         /* Feed this message into MAC computation. */
 462         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
 463         if (s->msg_callback)
 464                 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
 465         *ok=1;
 466         return s->init_num;
 467 f_err:
 468         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 469 err:
 470         *ok=0;
 471         return(-1);
 472         }
 473
 474 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 475         {
 476         EVP_PKEY *pk;
 477         int ret= -1,i;
 478
 479         if (pkey == NULL)
 480                 pk=X509_get_pubkey(x);
 481         else
 482                 pk=pkey;
 483         if (pk == NULL) goto err;
 484
 485         i=pk->type;
 486         if (i == EVP_PKEY_RSA)
 487                 {
 488                 ret=SSL_PKEY_RSA_ENC;
 489                 }
 490         else if (i == EVP_PKEY_DSA)
 491                 {
 492                 ret=SSL_PKEY_DSA_SIGN;
 493                 }
 494 #ifndef OPENSSL_NO_EC
 495         else if (i == EVP_PKEY_EC)
 496                 {
 497                 ret = SSL_PKEY_ECC;
 498                 }
 499 #endif
 500         else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc)
 501                 {
 502                 ret = SSL_PKEY_GOST94;
 503                 }
 504         else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc)
 505                 {
 506                 ret = SSL_PKEY_GOST01;
 507                 }
 508         else if (x && (i == EVP_PKEY_DH || i == EVP_PKEY_DHX))
 509                 {
 510                 /* For DH two cases: DH certificate signed with RSA and
 511                  * DH certificate signed with DSA.
 512                  */
 513                 i = X509_certificate_type(x, pk);
 514                 if (i & EVP_PKS_RSA)
 515                         ret = SSL_PKEY_DH_RSA;
 516                 else if (i & EVP_PKS_DSA)
 517                         ret = SSL_PKEY_DH_DSA;
 518                 }
 519
 520 err:
 521         if(!pkey) EVP_PKEY_free(pk);
 522         return(ret);
 523         }
 524
 525 int ssl_verify_alarm_type(long type)
 526         {
 527         int al;
 528
 529         switch(type)
 530                 {
 531         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 532         case X509_V_ERR_UNABLE_TO_GET_CRL:
 533         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
 534                 al=SSL_AD_UNKNOWN_CA;
 535                 break;
 536         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 537         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 538         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 539         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 540         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 541         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 542         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 543         case X509_V_ERR_CERT_NOT_YET_VALID:
 544         case X509_V_ERR_CRL_NOT_YET_VALID:
 545         case X509_V_ERR_CERT_UNTRUSTED:
 546         case X509_V_ERR_CERT_REJECTED:
 547                 al=SSL_AD_BAD_CERTIFICATE;
 548                 break;
 549         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 550         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 551                 al=SSL_AD_DECRYPT_ERROR;
 552                 break;
 553         case X509_V_ERR_CERT_HAS_EXPIRED:
 554         case X509_V_ERR_CRL_HAS_EXPIRED:
 555                 al=SSL_AD_CERTIFICATE_EXPIRED;
 556                 break;
 557         case X509_V_ERR_CERT_REVOKED:
 558                 al=SSL_AD_CERTIFICATE_REVOKED;
 559                 break;
 560         case X509_V_ERR_OUT_OF_MEM:
 561                 al=SSL_AD_INTERNAL_ERROR;
 562                 break;
 563         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 564         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 565         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 566         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 567         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 568         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 569         case X509_V_ERR_INVALID_CA:
 570                 al=SSL_AD_UNKNOWN_CA;
 571                 break;
 572         case X509_V_ERR_APPLICATION_VERIFICATION:
 573                 al=SSL_AD_HANDSHAKE_FAILURE;
 574                 break;
 575         case X509_V_ERR_INVALID_PURPOSE:
 576                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
 577                 break;
 578         default:
 579                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 580                 break;
 581                 }
 582         return(al);
 583         }
 584
 585 #ifndef OPENSSL_NO_BUF_FREELISTS
 586 /*-
 587  * On some platforms, malloc() performance is bad enough that you can't just
 588  * free() and malloc() buffers all the time, so we need to use freelists from
 589  * unused buffers.  Currently, each freelist holds memory chunks of only a
 590  * given size (list->chunklen); other sized chunks are freed and malloced.
 591  * This doesn't help much if you're using many different SSL option settings
 592  * with a given context.  (The options affecting buffer size are
 593  * max_send_fragment, read buffer vs write buffer,
 594  * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and
 595  * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.)  Using a separate freelist for every
 596  * possible size is not an option, since max_send_fragment can take on many
 597  * different values.
 598  *
 599  * If you are on a platform with a slow malloc(), and you're using SSL
 600  * connections with many different settings for these options, and you need to
 601  * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options:
 602  *    - Link against a faster malloc implementation.
 603  *    - Use a separate SSL_CTX for each option set.
 604  *    - Improve this code.
 605  */
 606 static void *
 607 freelist_extract(SSL_CTX *ctx, int for_read, int sz)
 608         {
 609         SSL3_BUF_FREELIST *list;
 610         SSL3_BUF_FREELIST_ENTRY *ent = NULL;
 611         void *result = NULL;
 612
 613         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
 614         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
 615         if (list != NULL && sz == (int)list->chunklen)
 616                 ent = list->head;
 617         if (ent != NULL)
 618                 {
 619                 list->head = ent->next;
 620                 result = ent;
 621                 if (--list->len == 0)
 622                         list->chunklen = 0;
 623                 }
 624         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
 625         if (!result)
 626                 result = OPENSSL_malloc(sz);
 627         return result;
 628 }
 629
 630 static void
 631 freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem)
 632         {
 633         SSL3_BUF_FREELIST *list;
 634         SSL3_BUF_FREELIST_ENTRY *ent;
 635
 636         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
 637         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
 638         if (list != NULL &&
 639             (sz == list->chunklen || list->chunklen == 0) &&
 640             list->len < ctx->freelist_max_len &&
 641             sz >= sizeof(*ent))
 642                 {
 643                 list->chunklen = sz;
 644                 ent = mem;
 645                 ent->next = list->head;
 646                 list->head = ent;
 647                 ++list->len;
 648                 mem = NULL;
 649                 }
 650
 651         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
 652         if (mem)
 653                 OPENSSL_free(mem);
 654         }
 655 #else
 656 #define freelist_extract(c,fr,sz) OPENSSL_malloc(sz)
 657 #define freelist_insert(c,fr,sz,m) OPENSSL_free(m)
 658 #endif
 659
 660 int ssl3_setup_read_buffer(SSL *s)
 661         {
 662         unsigned char *p;
 663         size_t len,align=0,headerlen;
 664
 665         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 666                 headerlen = DTLS1_RT_HEADER_LENGTH;
 667         else
 668                 headerlen = SSL3_RT_HEADER_LENGTH;
 669
 670 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 671         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
 672 #endif
 673
 674         if (s->s3->rbuf.buf == NULL)
 675                 {
 676                 len = SSL3_RT_MAX_PLAIN_LENGTH
 677                         + SSL3_RT_MAX_ENCRYPTED_OVERHEAD
 678                         + headerlen + align;
 679                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 680                         {
 681                         s->s3->init_extra = 1;
 682                         len += SSL3_RT_MAX_EXTRA;
 683                         }
 684 #ifndef OPENSSL_NO_COMP
 685                 if (ssl_allow_compression(s))
 686                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 687 #endif
 688                 if ((p=freelist_extract(s->ctx, 1, len)) == NULL)
 689                         goto err;
 690                 s->s3->rbuf.buf = p;
 691                 s->s3->rbuf.len = len;
 692                 }
 693
 694         s->packet= &(s->s3->rbuf.buf[0]);
 695         return 1;
 696
 697 err:
 698         SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER,ERR_R_MALLOC_FAILURE);
 699         return 0;
 700         }
 701
 702 int ssl3_setup_write_buffer(SSL *s)
 703         {
 704         unsigned char *p;
 705         size_t len,align=0,headerlen;
 706
 707         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 708                 headerlen = DTLS1_RT_HEADER_LENGTH + 1;
 709         else
 710                 headerlen = SSL3_RT_HEADER_LENGTH;
 711
 712 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 713         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
 714 #endif
 715
 716         if (s->s3->wbuf.buf == NULL)
 717                 {
 718                 len = s->max_send_fragment
 719                         + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD
 720                         + headerlen + align;
 721 #ifndef OPENSSL_NO_COMP
 722                 if (ssl_allow_compression(s))
 723                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 724 #endif
 725                 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 726                         len += headerlen + align
 727                                 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
 728
 729                 if ((p=freelist_extract(s->ctx, 0, len)) == NULL)
 730                         goto err;
 731                 s->s3->wbuf.buf = p;
 732                 s->s3->wbuf.len = len;
 733                 }
 734
 735         return 1;
 736
 737 err:
 738         SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER,ERR_R_MALLOC_FAILURE);
 739         return 0;
 740         }
 741
 742
 743 int ssl3_setup_buffers(SSL *s)
 744         {
 745         if (!ssl3_setup_read_buffer(s))
 746                 return 0;
 747         if (!ssl3_setup_write_buffer(s))
 748                 return 0;
 749         return 1;
 750         }
 751
 752 int ssl3_release_write_buffer(SSL *s)
 753         {
 754         if (s->s3->wbuf.buf != NULL)
 755                 {
 756                 freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf);
 757                 s->s3->wbuf.buf = NULL;
 758                 }
 759         return 1;
 760         }
 761
 762 int ssl3_release_read_buffer(SSL *s)
 763         {
 764         if (s->s3->rbuf.buf != NULL)
 765                 {
 766                 freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf);
 767                 s->s3->rbuf.buf = NULL;
 768                 }
 769         return 1;
 770         }
 771
 772 int ssl_allow_compression(SSL *s)
 773         {
 774         if (s->options & SSL_OP_NO_COMPRESSION)
 775                 return 0;
 776         return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL);
 777         }
 778