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,*d;
 154         int i;
 155         unsigned long l;
 156
 157         if (s->state == a)
 158                 {
 159                 d=(unsigned char *)s->init_buf->data;
 160                 p= &(d[4]);
 161
 162                 i=s->method->ssl3_enc->final_finish_mac(s,
 163                         sender,slen,s->s3->tmp.finish_md);
 164                 s->s3->tmp.finish_md_len = i;
 165                 memcpy(p, s->s3->tmp.finish_md, i);
 166                 p+=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 #ifdef OPENSSL_SYS_WIN16
 187                 /* MSVC 1.5 does not clear the top bytes of the word unless
 188                  * I do this.
 189                  */
 190                 l&=0xffff;
 191 #endif
 192
 193                 *(d++)=SSL3_MT_FINISHED;
 194                 l2n3(l,d);
 195                 s->init_num=(int)l+4;
 196                 s->init_off=0;
 197
 198                 s->state=b;
 199                 }
 200
 201         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
 202         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 203         }
 204
 205 int ssl3_get_finished(SSL *s, int a, int b)
 206         {
 207         int al,i,ok;
 208         long n;
 209         unsigned char *p;
 210
 211         /* the mac has already been generated when we received the
 212          * change cipher spec message and is in s->s3->tmp.peer_finish_md
 213          */
 214
 215         n=s->method->ssl_get_message(s,
 216                 a,
 217                 b,
 218                 SSL3_MT_FINISHED,
 219                 64, /* should actually be 36+4 :-) */
 220                 &ok);
 221
 222         if (!ok) return((int)n);
 223
 224         /* If this occurs, we have missed a message */
 225         if (!s->s3->change_cipher_spec)
 226                 {
 227                 al=SSL_AD_UNEXPECTED_MESSAGE;
 228                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
 229                 goto f_err;
 230                 }
 231         s->s3->change_cipher_spec=0;
 232
 233         p = (unsigned char *)s->init_msg;
 234         i = s->s3->tmp.peer_finish_md_len;
 235
 236         if (i != n)
 237                 {
 238                 al=SSL_AD_DECODE_ERROR;
 239                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
 240                 goto f_err;
 241                 }
 242
 243         if (CRYPTO_memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
 244                 {
 245                 al=SSL_AD_DECRYPT_ERROR;
 246                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
 247                 goto f_err;
 248                 }
 249
 250         /* Copy the finished so we can use it for
 251            renegotiation checks */
 252         if(s->type == SSL_ST_ACCEPT)
 253                 {
 254                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 255                 memcpy(s->s3->previous_client_finished,
 256                     s->s3->tmp.peer_finish_md, i);
 257                 s->s3->previous_client_finished_len=i;
 258                 }
 259         else
 260                 {
 261                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
 262                 memcpy(s->s3->previous_server_finished,
 263                     s->s3->tmp.peer_finish_md, i);
 264                 s->s3->previous_server_finished_len=i;
 265                 }
 266
 267         return(1);
 268 f_err:
 269         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 270         return(0);
 271         }
 272
 273 /* for these 2 messages, we need to
 274  * ssl->enc_read_ctx                    re-init
 275  * ssl->s3->read_sequence               zero
 276  * ssl->s3->read_mac_secret             re-init
 277  * ssl->session->read_sym_enc           assign
 278  * ssl->session->read_compression       assign
 279  * ssl->session->read_hash              assign
 280  */
 281 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
 282         {
 283         unsigned char *p;
 284
 285         if (s->state == a)
 286                 {
 287                 p=(unsigned char *)s->init_buf->data;
 288                 *p=SSL3_MT_CCS;
 289                 s->init_num=1;
 290                 s->init_off=0;
 291
 292                 s->state=b;
 293                 }
 294
 295         /* SSL3_ST_CW_CHANGE_B */
 296         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
 297         }
 298
 299 static int ssl3_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
 300         {
 301         int n;
 302         unsigned char *p;
 303
 304         n=i2d_X509(x,NULL);
 305         if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
 306                 {
 307                 SSLerr(SSL_F_SSL3_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
 308                 return(-1);
 309                 }
 310         p=(unsigned char *)&(buf->data[*l]);
 311         l2n3(n,p);
 312         i2d_X509(x,&p);
 313         *l+=n+3;
 314
 315         return(0);
 316         }
 317
 318 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
 319         {
 320         unsigned char *p;
 321         int i;
 322         unsigned long l=7;
 323         BUF_MEM *buf;
 324         int no_chain;
 325
 326         if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
 327                 no_chain = 1;
 328         else
 329                 no_chain = 0;
 330
 331         /* TLSv1 sends a chain with nothing in it, instead of an alert */
 332         buf=s->init_buf;
 333         if (!BUF_MEM_grow_clean(buf,10))
 334                 {
 335                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
 336                 return(0);
 337                 }
 338         if (x != NULL)
 339                 {
 340                 if (no_chain)
 341                         {
 342                         if (ssl3_add_cert_to_buf(buf, &l, x))
 343                                 return(0);
 344                         }
 345                 else
 346                         {
 347                         X509_STORE_CTX xs_ctx;
 348
 349                         if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
 350                                 {
 351                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
 352                                 return(0);
 353                                 }
 354                         X509_verify_cert(&xs_ctx);
 355                         /* Don't leave errors in the queue */
 356                         ERR_clear_error();
 357                         for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
 358                                 {
 359                                 x = sk_X509_value(xs_ctx.chain, i);
 360
 361                                 if (ssl3_add_cert_to_buf(buf, &l, x))
 362                                         {
 363                                         X509_STORE_CTX_cleanup(&xs_ctx);
 364                                         return 0;
 365                                         }
 366                                 }
 367                         X509_STORE_CTX_cleanup(&xs_ctx);
 368                         }
 369                 }
 370         /* Thawte special :-) */
 371         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
 372                 {
 373                 x=sk_X509_value(s->ctx->extra_certs,i);
 374                 if (ssl3_add_cert_to_buf(buf, &l, x))
 375                         return(0);
 376                 }
 377
 378         l-=7;
 379         p=(unsigned char *)&(buf->data[4]);
 380         l2n3(l,p);
 381         l+=3;
 382         p=(unsigned char *)&(buf->data[0]);
 383         *(p++)=SSL3_MT_CERTIFICATE;
 384         l2n3(l,p);
 385         l+=4;
 386         return(l);
 387         }
 388
 389 /* Obtain handshake message of message type 'mt' (any if mt == -1),
 390  * maximum acceptable body length 'max'.
 391  * The first four bytes (msg_type and length) are read in state 'st1',
 392  * the body is read in state 'stn'.
 393  */
 394 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 395         {
 396         unsigned char *p;
 397         unsigned long l;
 398         long n;
 399         int i,al;
 400
 401         if (s->s3->tmp.reuse_message)
 402                 {
 403                 s->s3->tmp.reuse_message=0;
 404                 if ((mt >= 0) && (s->s3->tmp.message_type != 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                 *ok=1;
 411                 s->state = stn;
 412                 s->init_msg = s->init_buf->data + 4;
 413                 s->init_num = (int)s->s3->tmp.message_size;
 414                 return s->init_num;
 415                 }
 416
 417         p=(unsigned char *)s->init_buf->data;
 418
 419         if (s->state == st1) /* s->init_num < 4 */
 420                 {
 421                 int skip_message;
 422
 423                 do
 424                         {
 425                         while (s->init_num < 4)
 426                                 {
 427                                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
 428                                         &p[s->init_num],4 - s->init_num, 0);
 429                                 if (i <= 0)
 430                                         {
 431                                         s->rwstate=SSL_READING;
 432                                         *ok = 0;
 433                                         return i;
 434                                         }
 435                                 s->init_num+=i;
 436                                 }
 437
 438                         skip_message = 0;
 439                         if (!s->server)
 440                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
 441                                         /* The server may always send 'Hello Request' messages --
 442                                          * we are doing a handshake anyway now, so ignore them
 443                                          * if their format is correct. Does not count for
 444                                          * 'Finished' MAC. */
 445                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
 446                                                 {
 447                                                 s->init_num = 0;
 448                                                 skip_message = 1;
 449
 450                                                 if (s->msg_callback)
 451                                                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
 452                                                 }
 453                         }
 454                 while (skip_message);
 455
 456                 /* s->init_num == 4 */
 457
 458                 if ((mt >= 0) && (*p != mt))
 459                         {
 460                         al=SSL_AD_UNEXPECTED_MESSAGE;
 461                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
 462                         goto f_err;
 463                         }
 464                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
 465                                         (st1 == SSL3_ST_SR_CERT_A) &&
 466                                         (stn == SSL3_ST_SR_CERT_B))
 467                         {
 468                         /* At this point we have got an MS SGC second client
 469                          * hello (maybe we should always allow the client to
 470                          * start a new handshake?). We need to restart the mac.
 471                          * Don't increment {num,total}_renegotiations because
 472                          * we have not completed the handshake. */
 473                         ssl3_init_finished_mac(s);
 474                         }
 475
 476                 s->s3->tmp.message_type= *(p++);
 477
 478                 n2l3(p,l);
 479                 if (l > (unsigned long)max)
 480                         {
 481                         al=SSL_AD_ILLEGAL_PARAMETER;
 482                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 483                         goto f_err;
 484                         }
 485                 if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
 486                         {
 487                         al=SSL_AD_ILLEGAL_PARAMETER;
 488                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
 489                         goto f_err;
 490                         }
 491                 if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))
 492                         {
 493                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
 494                         goto err;
 495                         }
 496                 s->s3->tmp.message_size=l;
 497                 s->state=stn;
 498
 499                 s->init_msg = s->init_buf->data + 4;
 500                 s->init_num = 0;
 501                 }
 502
 503         /* next state (stn) */
 504         p = s->init_msg;
 505         n = s->s3->tmp.message_size - s->init_num;
 506         while (n > 0)
 507                 {
 508                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
 509                 if (i <= 0)
 510                         {
 511                         s->rwstate=SSL_READING;
 512                         *ok = 0;
 513                         return i;
 514                         }
 515                 s->init_num += i;
 516                 n -= i;
 517                 }
 518         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
 519         if (s->msg_callback)
 520                 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
 521         *ok=1;
 522         return s->init_num;
 523 f_err:
 524         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 525 err:
 526         *ok=0;
 527         return(-1);
 528         }
 529
 530 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
 531         {
 532         EVP_PKEY *pk;
 533         int ret= -1,i;
 534
 535         if (pkey == NULL)
 536                 pk=X509_get_pubkey(x);
 537         else
 538                 pk=pkey;
 539         if (pk == NULL) goto err;
 540
 541         i=pk->type;
 542         if (i == EVP_PKEY_RSA)
 543                 {
 544                 ret=SSL_PKEY_RSA_ENC;
 545                 }
 546         else if (i == EVP_PKEY_DSA)
 547                 {
 548                 ret=SSL_PKEY_DSA_SIGN;
 549                 }
 550 #ifndef OPENSSL_NO_EC
 551         else if (i == EVP_PKEY_EC)
 552                 {
 553                 ret = SSL_PKEY_ECC;
 554                 }
 555 #endif
 556         else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc)
 557                 {
 558                 ret = SSL_PKEY_GOST94;
 559                 }
 560         else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc)
 561                 {
 562                 ret = SSL_PKEY_GOST01;
 563                 }
 564 err:
 565         if(!pkey) EVP_PKEY_free(pk);
 566         return(ret);
 567         }
 568
 569 int ssl_verify_alarm_type(long type)
 570         {
 571         int al;
 572
 573         switch(type)
 574                 {
 575         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 576         case X509_V_ERR_UNABLE_TO_GET_CRL:
 577         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
 578                 al=SSL_AD_UNKNOWN_CA;
 579                 break;
 580         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
 581         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
 582         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
 583         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 584         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 585         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
 586         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
 587         case X509_V_ERR_CERT_NOT_YET_VALID:
 588         case X509_V_ERR_CRL_NOT_YET_VALID:
 589         case X509_V_ERR_CERT_UNTRUSTED:
 590         case X509_V_ERR_CERT_REJECTED:
 591                 al=SSL_AD_BAD_CERTIFICATE;
 592                 break;
 593         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
 594         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
 595                 al=SSL_AD_DECRYPT_ERROR;
 596                 break;
 597         case X509_V_ERR_CERT_HAS_EXPIRED:
 598         case X509_V_ERR_CRL_HAS_EXPIRED:
 599                 al=SSL_AD_CERTIFICATE_EXPIRED;
 600                 break;
 601         case X509_V_ERR_CERT_REVOKED:
 602                 al=SSL_AD_CERTIFICATE_REVOKED;
 603                 break;
 604         case X509_V_ERR_OUT_OF_MEM:
 605                 al=SSL_AD_INTERNAL_ERROR;
 606                 break;
 607         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 608         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
 609         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
 610         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
 611         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
 612         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 613         case X509_V_ERR_INVALID_CA:
 614                 al=SSL_AD_UNKNOWN_CA;
 615                 break;
 616         case X509_V_ERR_APPLICATION_VERIFICATION:
 617                 al=SSL_AD_HANDSHAKE_FAILURE;
 618                 break;
 619         case X509_V_ERR_INVALID_PURPOSE:
 620                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
 621                 break;
 622         default:
 623                 al=SSL_AD_CERTIFICATE_UNKNOWN;
 624                 break;
 625                 }
 626         return(al);
 627         }
 628
 629 #ifndef OPENSSL_NO_BUF_FREELISTS
 630 /* On some platforms, malloc() performance is bad enough that you can't just
 631  * free() and malloc() buffers all the time, so we need to use freelists from
 632  * unused buffers.  Currently, each freelist holds memory chunks of only a
 633  * given size (list->chunklen); other sized chunks are freed and malloced.
 634  * This doesn't help much if you're using many different SSL option settings
 635  * with a given context.  (The options affecting buffer size are
 636  * max_send_fragment, read buffer vs write buffer,
 637  * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and
 638  * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.)  Using a separate freelist for every
 639  * possible size is not an option, since max_send_fragment can take on many
 640  * different values.
 641  *
 642  * If you are on a platform with a slow malloc(), and you're using SSL
 643  * connections with many different settings for these options, and you need to
 644  * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options:
 645  *    - Link against a faster malloc implementation.
 646  *    - Use a separate SSL_CTX for each option set.
 647  *    - Improve this code.
 648  */
 649 static void *
 650 freelist_extract(SSL_CTX *ctx, int for_read, int sz)
 651         {
 652         SSL3_BUF_FREELIST *list;
 653         SSL3_BUF_FREELIST_ENTRY *ent = NULL;
 654         void *result = NULL;
 655
 656         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
 657         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
 658         if (list != NULL && sz == (int)list->chunklen)
 659                 ent = list->head;
 660         if (ent != NULL)
 661                 {
 662                 list->head = ent->next;
 663                 result = ent;
 664                 if (--list->len == 0)
 665                         list->chunklen = 0;
 666                 }
 667         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
 668         if (!result)
 669                 result = OPENSSL_malloc(sz);
 670         return result;
 671 }
 672
 673 static void
 674 freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem)
 675         {
 676         SSL3_BUF_FREELIST *list;
 677         SSL3_BUF_FREELIST_ENTRY *ent;
 678
 679         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
 680         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
 681         if (list != NULL &&
 682             (sz == list->chunklen || list->chunklen == 0) &&
 683             list->len < ctx->freelist_max_len &&
 684             sz >= sizeof(*ent))
 685                 {
 686                 list->chunklen = sz;
 687                 ent = mem;
 688                 ent->next = list->head;
 689                 list->head = ent;
 690                 ++list->len;
 691                 mem = NULL;
 692                 }
 693
 694         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
 695         if (mem)
 696                 OPENSSL_free(mem);
 697         }
 698 #else
 699 #define freelist_extract(c,fr,sz) OPENSSL_malloc(sz)
 700 #define freelist_insert(c,fr,sz,m) OPENSSL_free(m)
 701 #endif
 702
 703 int ssl3_setup_read_buffer(SSL *s)
 704         {
 705         unsigned char *p;
 706         size_t len,align=0,headerlen;
 707
 708         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 709                 headerlen = DTLS1_RT_HEADER_LENGTH;
 710         else
 711                 headerlen = SSL3_RT_HEADER_LENGTH;
 712
 713 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 714         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
 715 #endif
 716
 717         if (s->s3->rbuf.buf == NULL)
 718                 {
 719                 len = SSL3_RT_MAX_PLAIN_LENGTH
 720                         + SSL3_RT_MAX_ENCRYPTED_OVERHEAD
 721                         + headerlen + align;
 722                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 723                         {
 724                         s->s3->init_extra = 1;
 725                         len += SSL3_RT_MAX_EXTRA;
 726                         }
 727 #ifndef OPENSSL_NO_COMP
 728                 if (!(s->options & SSL_OP_NO_COMPRESSION))
 729                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 730 #endif
 731                 if ((p=freelist_extract(s->ctx, 1, len)) == NULL)
 732                         goto err;
 733                 s->s3->rbuf.buf = p;
 734                 s->s3->rbuf.len = len;
 735                 }
 736
 737         s->packet= &(s->s3->rbuf.buf[0]);
 738         return 1;
 739
 740 err:
 741         SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER,ERR_R_MALLOC_FAILURE);
 742         return 0;
 743         }
 744
 745 int ssl3_setup_write_buffer(SSL *s)
 746         {
 747         unsigned char *p;
 748         size_t len,align=0,headerlen;
 749
 750         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 751                 headerlen = DTLS1_RT_HEADER_LENGTH + 1;
 752         else
 753                 headerlen = SSL3_RT_HEADER_LENGTH;
 754
 755 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 756         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
 757 #endif
 758
 759         if (s->s3->wbuf.buf == NULL)
 760                 {
 761                 len = s->max_send_fragment
 762                         + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD
 763                         + headerlen + align;
 764 #ifndef OPENSSL_NO_COMP
 765                 if (!(s->options & SSL_OP_NO_COMPRESSION))
 766                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 767 #endif
 768                 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 769                         len += headerlen + align
 770                                 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
 771
 772                 if ((p=freelist_extract(s->ctx, 0, len)) == NULL)
 773                         goto err;
 774                 s->s3->wbuf.buf = p;
 775                 s->s3->wbuf.len = len;
 776                 }
 777
 778         return 1;
 779
 780 err:
 781         SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER,ERR_R_MALLOC_FAILURE);
 782         return 0;
 783         }
 784
 785
 786 int ssl3_setup_buffers(SSL *s)
 787         {
 788         if (!ssl3_setup_read_buffer(s))
 789                 return 0;
 790         if (!ssl3_setup_write_buffer(s))
 791                 return 0;
 792         return 1;
 793         }
 794
 795 int ssl3_release_write_buffer(SSL *s)
 796         {
 797         if (s->s3->wbuf.buf != NULL)
 798                 {
 799                 freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf);
 800                 s->s3->wbuf.buf = NULL;
 801                 }
 802         return 1;
 803         }
 804
 805 int ssl3_release_read_buffer(SSL *s)
 806         {
 807         if (s->s3->rbuf.buf != NULL)
 808                 {
 809                 freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf);
 810                 s->s3->rbuf.buf = NULL;
 811                 }
 812         return 1;
 813         }
 814