ssl/s3_pkt.c

   1 /* ssl/s3_pkt.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 #include <stdio.h>
 113 #include <errno.h>
 114 #define USE_SOCKETS
 115 #include "ssl_locl.h"
 116 #include <openssl/evp.h>
 117 #include <openssl/buffer.h>
 118
 119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 120                          unsigned int len, int create_empty_fragment);
 121 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 122                               unsigned int len);
 123 static int ssl3_get_record(SSL *s);
 124 static int do_compress(SSL *ssl);
 125 static int do_uncompress(SSL *ssl);
 126 static int do_change_cipher_spec(SSL *ssl);
 127
 128 /* used only by ssl3_get_record */
 129 static int ssl3_read_n(SSL *s, int n, int max, int extend)
 130         {
 131         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
 132          * packet by another n bytes.
 133          * The packet will be in the sub-array of s->s3->rbuf.buf specified
 134          * by s->packet and s->packet_length.
 135          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
 136          * [plus s->packet_length bytes if extend == 1].)
 137          */
 138         int i,off,newb;
 139
 140         if (!extend)
 141                 {
 142                 /* start with empty packet ... */
 143                 if (s->s3->rbuf.left == 0)
 144                         s->s3->rbuf.offset = 0;
 145                 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
 146                 s->packet_length = 0;
 147                 /* ... now we can act as if 'extend' was set */
 148                 }
 149
 150         /* if there is enough in the buffer from a previous read, take some */
 151         if (s->s3->rbuf.left >= (int)n)
 152                 {
 153                 s->packet_length+=n;
 154                 s->s3->rbuf.left-=n;
 155                 s->s3->rbuf.offset+=n;
 156                 return(n);
 157                 }
 158
 159         /* else we need to read more data */
 160         if (!s->read_ahead)
 161                 max=n;
 162
 163         {
 164                 /* avoid buffer overflow */
 165                 int max_max = s->s3->rbuf.len - s->packet_length;
 166                 if (max > max_max)
 167                         max = max_max;
 168         }
 169         if (n > max) /* does not happen */
 170                 {
 171                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 172                 return -1;
 173                 }
 174
 175         off = s->packet_length;
 176         newb = s->s3->rbuf.left;
 177         /* Move any available bytes to front of buffer:
 178          * 'off' bytes already pointed to by 'packet',
 179          * 'newb' extra ones at the end */
 180         if (s->packet != s->s3->rbuf.buf)
 181                 {
 182                 /*  off > 0 */
 183                 memmove(s->s3->rbuf.buf, s->packet, off+newb);
 184                 s->packet = s->s3->rbuf.buf;
 185                 }
 186
 187         while (newb < n)
 188                 {
 189                 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
 190                  * to read in more until we have off+n (up to off+max if possible) */
 191
 192                 clear_sys_error();
 193                 if (s->rbio != NULL)
 194                         {
 195                         s->rwstate=SSL_READING;
 196                         i=BIO_read(s->rbio,     &(s->s3->rbuf.buf[off+newb]), max-newb);
 197                         }
 198                 else
 199                         {
 200                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 201                         i = -1;
 202                         }
 203
 204                 if (i <= 0)
 205                         {
 206                         s->s3->rbuf.left = newb;
 207                         return(i);
 208                         }
 209                 newb+=i;
 210                 }
 211
 212         /* done reading, now the book-keeping */
 213         s->s3->rbuf.offset = off + n;
 214         s->s3->rbuf.left = newb - n;
 215         s->packet_length += n;
 216         s->rwstate=SSL_NOTHING;
 217         return(n);
 218         }
 219
 220 /* Call this to get a new input record.
 221  * It will return <= 0 if more data is needed, normally due to an error
 222  * or non-blocking IO.
 223  * When it finishes, one packet has been decoded and can be found in
 224  * ssl->s3->rrec.type    - is the type of record
 225  * ssl->s3->rrec.data,   - data
 226  * ssl->s3->rrec.length, - number of bytes
 227  */
 228 /* used only by ssl3_read_bytes */
 229 static int ssl3_get_record(SSL *s)
 230         {
 231         int ssl_major,ssl_minor,al;
 232         int enc_err,n,i,ret= -1;
 233         SSL3_RECORD *rr;
 234         SSL_SESSION *sess;
 235         unsigned char *p;
 236         unsigned char md[EVP_MAX_MD_SIZE];
 237         short version;
 238         unsigned int mac_size;
 239         int clear=0;
 240         size_t extra;
 241         int decryption_failed_or_bad_record_mac = 0;
 242         unsigned char *mac = NULL;
 243
 244         rr= &(s->s3->rrec);
 245         sess=s->session;
 246
 247         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 248                 extra=SSL3_RT_MAX_EXTRA;
 249         else
 250                 extra=0;
 251         if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE)
 252                 {
 253                 /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 254                  * set after ssl3_setup_buffers() was done */
 255                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 256                 return -1;
 257                 }
 258
 259 again:
 260         /* check if we have the header */
 261         if (    (s->rstate != SSL_ST_READ_BODY) ||
 262                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 263                 {
 264                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 265                 if (n <= 0) return(n); /* error or non-blocking */
 266                 s->rstate=SSL_ST_READ_BODY;
 267
 268                 p=s->packet;
 269
 270                 /* Pull apart the header into the SSL3_RECORD */
 271                 rr->type= *(p++);
 272                 ssl_major= *(p++);
 273                 ssl_minor= *(p++);
 274                 version=(ssl_major<<8)|ssl_minor;
 275                 n2s(p,rr->length);
 276
 277                 /* Lets check version */
 278                 if (s->first_packet)
 279                         {
 280                         s->first_packet=0;
 281                         }
 282                 else
 283                         {
 284                         if (version != s->version)
 285                                 {
 286                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 287                                 /* Send back error using their
 288                                  * version number :-) */
 289                                 s->version=version;
 290                                 al=SSL_AD_PROTOCOL_VERSION;
 291                                 goto f_err;
 292                                 }
 293                         }
 294
 295                 if ((version>>8) != SSL3_VERSION_MAJOR)
 296                         {
 297                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 298                         goto err;
 299                         }
 300
 301                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 302                         {
 303                         al=SSL_AD_RECORD_OVERFLOW;
 304                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 305                         goto f_err;
 306                         }
 307
 308                 /* now s->rstate == SSL_ST_READ_BODY */
 309                 }
 310
 311         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 312
 313         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 314                 {
 315                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 316                 i=rr->length;
 317                 n=ssl3_read_n(s,i,i,1);
 318                 if (n <= 0) return(n); /* error or non-blocking io */
 319                 /* now n == rr->length,
 320                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 321                 }
 322
 323         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 324
 325         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 326          * and we have that many bytes in s->packet
 327          */
 328         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 329
 330         /* ok, we can now read from 's->packet' data into 'rr'
 331          * rr->input points at rr->length bytes, which
 332          * need to be copied into rr->data by either
 333          * the decryption or by the decompression
 334          * When the data is 'copied' into the rr->data buffer,
 335          * rr->input will be pointed at the new buffer */
 336
 337         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 338          * rr->length bytes of encrypted compressed stuff. */
 339
 340         /* check is not needed I believe */
 341         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 342                 {
 343                 al=SSL_AD_RECORD_OVERFLOW;
 344                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 345                 goto f_err;
 346                 }
 347
 348         /* decrypt in place in 'rr->input' */
 349         rr->data=rr->input;
 350
 351         enc_err = s->method->ssl3_enc->enc(s,0);
 352         if (enc_err <= 0)
 353                 {
 354                 if (enc_err == 0)
 355                         /* SSLerr() and ssl3_send_alert() have been called */
 356                         goto err;
 357
 358                 /* Otherwise enc_err == -1, which indicates bad padding
 359                  * (rec->length has not been changed in this case).
 360                  * To minimize information leaked via timing, we will perform
 361                  * the MAC computation anyway. */
 362                 decryption_failed_or_bad_record_mac = 1;
 363                 }
 364
 365 #ifdef TLS_DEBUG
 366 printf("dec %d\n",rr->length);
 367 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 368 printf("\n");
 369 #endif
 370
 371         /* r->length is now the compressed data plus mac */
 372         if (    (sess == NULL) ||
 373                 (s->enc_read_ctx == NULL) ||
 374                 (s->read_hash == NULL))
 375                 clear=1;
 376
 377         if (!clear)
 378                 {
 379                 mac_size=EVP_MD_size(s->read_hash);
 380
 381                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 382                         {
 383 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 384                         al=SSL_AD_RECORD_OVERFLOW;
 385                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 386                         goto f_err;
 387 #else
 388                         decryption_failed_or_bad_record_mac = 1;
 389 #endif
 390                         }
 391                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 392                 if (rr->length >= mac_size)
 393                         {
 394                         rr->length -= mac_size;
 395                         mac = &rr->data[rr->length];
 396                         }
 397                 else
 398                         {
 399                         /* record (minus padding) is too short to contain a MAC */
 400 #if 0 /* OK only for stream ciphers */
 401                         al=SSL_AD_DECODE_ERROR;
 402                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 403                         goto f_err;
 404 #else
 405                         decryption_failed_or_bad_record_mac = 1;
 406                         rr->length = 0;
 407 #endif
 408                         }
 409                 i=s->method->ssl3_enc->mac(s,md,0);
 410                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 411                         {
 412                         decryption_failed_or_bad_record_mac = 1;
 413                         }
 414                 }
 415
 416         if (decryption_failed_or_bad_record_mac)
 417                 {
 418                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 419                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 420                  * failure is directly visible from the ciphertext anyway,
 421                  * we should not reveal which kind of error occured -- this
 422                  * might become visible to an attacker (e.g. via a logfile) */
 423                 al=SSL_AD_BAD_RECORD_MAC;
 424                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 425                 goto f_err;
 426                 }
 427
 428         /* r->length is now just compressed */
 429         if (s->expand != NULL)
 430                 {
 431                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 432                         {
 433                         al=SSL_AD_RECORD_OVERFLOW;
 434                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 435                         goto f_err;
 436                         }
 437                 if (!do_uncompress(s))
 438                         {
 439                         al=SSL_AD_DECOMPRESSION_FAILURE;
 440                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 441                         goto f_err;
 442                         }
 443                 }
 444
 445         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 446                 {
 447                 al=SSL_AD_RECORD_OVERFLOW;
 448                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 449                 goto f_err;
 450                 }
 451
 452         rr->off=0;
 453         /* So at this point the following is true
 454          * ssl->s3->rrec.type   is the type of record
 455          * ssl->s3->rrec.length == number of bytes in record
 456          * ssl->s3->rrec.off    == offset to first valid byte
 457          * ssl->s3->rrec.data   == where to take bytes from, increment
 458          *                         after use :-).
 459          */
 460
 461         /* we have pulled in a full packet so zero things */
 462         s->packet_length=0;
 463
 464         /* just read a 0 length packet */
 465         if (rr->length == 0) goto again;
 466
 467         return(1);
 468
 469 f_err:
 470         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 471 err:
 472         return(ret);
 473         }
 474
 475 static int do_uncompress(SSL *ssl)
 476         {
 477         int i;
 478         SSL3_RECORD *rr;
 479
 480         rr= &(ssl->s3->rrec);
 481         i=COMP_expand_block(ssl->expand,rr->comp,
 482                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 483         if (i < 0)
 484                 return(0);
 485         else
 486                 rr->length=i;
 487         rr->data=rr->comp;
 488
 489         return(1);
 490         }
 491
 492 static int do_compress(SSL *ssl)
 493         {
 494         int i;
 495         SSL3_RECORD *wr;
 496
 497         wr= &(ssl->s3->wrec);
 498         i=COMP_compress_block(ssl->compress,wr->data,
 499                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 500                 wr->input,(int)wr->length);
 501         if (i < 0)
 502                 return(0);
 503         else
 504                 wr->length=i;
 505
 506         wr->input=wr->data;
 507         return(1);
 508         }
 509
 510 /* Call this to write data in records of type 'type'
 511  * It will return <= 0 if not all data has been sent or non-blocking IO.
 512  */
 513 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 514         {
 515         const unsigned char *buf=buf_;
 516         unsigned int tot,n,nw;
 517         int i;
 518
 519         s->rwstate=SSL_NOTHING;
 520         tot=s->s3->wnum;
 521         s->s3->wnum=0;
 522
 523         if (SSL_in_init(s) && !s->in_handshake)
 524                 {
 525                 i=s->handshake_func(s);
 526                 if (i < 0) return(i);
 527                 if (i == 0)
 528                         {
 529                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 530                         return -1;
 531                         }
 532                 }
 533
 534         n=(len-tot);
 535         for (;;)
 536                 {
 537                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 538                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 539                 else
 540                         nw=n;
 541
 542                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 543                 if (i <= 0)
 544                         {
 545                         s->s3->wnum=tot;
 546                         return i;
 547                         }
 548
 549                 if ((i == (int)n) ||
 550                         (type == SSL3_RT_APPLICATION_DATA &&
 551                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 552                         {
 553                         /* next chunk of data should get another prepended empty fragment
 554                          * in ciphersuites with known-IV weakness: */
 555                         s->s3->empty_fragment_done = 0;
 556
 557                         return tot+i;
 558                         }
 559
 560                 n-=i;
 561                 tot+=i;
 562                 }
 563         }
 564
 565 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 566                          unsigned int len, int create_empty_fragment)
 567         {
 568         unsigned char *p,*plen;
 569         int i,mac_size,clear=0;
 570         int prefix_len = 0;
 571         SSL3_RECORD *wr;
 572         SSL3_BUFFER *wb;
 573         SSL_SESSION *sess;
 574
 575         /* first check if there is a SSL3_BUFFER still being written
 576          * out.  This will happen with non blocking IO */
 577         if (s->s3->wbuf.left != 0)
 578                 return(ssl3_write_pending(s,type,buf,len));
 579
 580         /* If we have an alert to send, lets send it */
 581         if (s->s3->alert_dispatch)
 582                 {
 583                 i=ssl3_dispatch_alert(s);
 584                 if (i <= 0)
 585                         return(i);
 586                 /* if it went, fall through and send more stuff */
 587                 }
 588
 589         if (len == 0 && !create_empty_fragment)
 590                 return 0;
 591
 592         wr= &(s->s3->wrec);
 593         wb= &(s->s3->wbuf);
 594         sess=s->session;
 595
 596         if (    (sess == NULL) ||
 597                 (s->enc_write_ctx == NULL) ||
 598                 (s->write_hash == NULL))
 599                 clear=1;
 600
 601         if (clear)
 602                 mac_size=0;
 603         else
 604                 mac_size=EVP_MD_size(s->write_hash);
 605
 606         /* 'create_empty_fragment' is true only when this function calls itself */
 607         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 608                 {
 609                 /* countermeasure against known-IV weakness in CBC ciphersuites
 610                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 611
 612                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 613                         {
 614                         /* recursive function call with 'create_empty_fragment' set;
 615                          * this prepares and buffers the data for an empty fragment
 616                          * (these 'prefix_len' bytes are sent out later
 617                          * together with the actual payload) */
 618                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 619                         if (prefix_len <= 0)
 620                                 goto err;
 621
 622                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
 623                                 {
 624                                 /* insufficient space */
 625                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 626                                 goto err;
 627                                 }
 628                         }
 629
 630                 s->s3->empty_fragment_done = 1;
 631                 }
 632
 633         p = wb->buf + prefix_len;
 634
 635         /* write the header */
 636
 637         *(p++)=type&0xff;
 638         wr->type=type;
 639
 640         *(p++)=(s->version>>8);
 641         *(p++)=s->version&0xff;
 642
 643         /* field where we are to write out packet length */
 644         plen=p;
 645         p+=2;
 646
 647         /* lets setup the record stuff. */
 648         wr->data=p;
 649         wr->length=(int)len;
 650         wr->input=(unsigned char *)buf;
 651
 652         /* we now 'read' from wr->input, wr->length bytes into
 653          * wr->data */
 654
 655         /* first we compress */
 656         if (s->compress != NULL)
 657                 {
 658                 if (!do_compress(s))
 659                         {
 660                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 661                         goto err;
 662                         }
 663                 }
 664         else
 665                 {
 666                 memcpy(wr->data,wr->input,wr->length);
 667                 wr->input=wr->data;
 668                 }
 669
 670         /* we should still have the output to wr->data and the input
 671          * from wr->input.  Length should be wr->length.
 672          * wr->data still points in the wb->buf */
 673
 674         if (mac_size != 0)
 675                 {
 676                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 677                 wr->length+=mac_size;
 678                 wr->input=p;
 679                 wr->data=p;
 680                 }
 681
 682         /* ssl3_enc can only have an error on read */
 683         s->method->ssl3_enc->enc(s,1);
 684
 685         /* record length after mac and block padding */
 686         s2n(wr->length,plen);
 687
 688         /* we should now have
 689          * wr->data pointing to the encrypted data, which is
 690          * wr->length long */
 691         wr->type=type; /* not needed but helps for debugging */
 692         wr->length+=SSL3_RT_HEADER_LENGTH;
 693
 694         if (create_empty_fragment)
 695                 {
 696                 /* we are in a recursive call;
 697                  * just return the length, don't write out anything here
 698                  */
 699                 return wr->length;
 700                 }
 701
 702         /* now let's set up wb */
 703         wb->left = prefix_len + wr->length;
 704         wb->offset = 0;
 705
 706         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 707         s->s3->wpend_tot=len;
 708         s->s3->wpend_buf=buf;
 709         s->s3->wpend_type=type;
 710         s->s3->wpend_ret=len;
 711
 712         /* we now just need to write the buffer */
 713         return ssl3_write_pending(s,type,buf,len);
 714 err:
 715         return -1;
 716         }
 717
 718 /* if s->s3->wbuf.left != 0, we need to call this */
 719 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 720                               unsigned int len)
 721         {
 722         int i;
 723
 724 /* XXXX */
 725         if ((s->s3->wpend_tot > (int)len)
 726                 || ((s->s3->wpend_buf != buf) &&
 727                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 728                 || (s->s3->wpend_type != type))
 729                 {
 730                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 731                 return(-1);
 732                 }
 733
 734         for (;;)
 735                 {
 736                 clear_sys_error();
 737                 if (s->wbio != NULL)
 738                         {
 739                         s->rwstate=SSL_WRITING;
 740                         i=BIO_write(s->wbio,
 741                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 742                                 (unsigned int)s->s3->wbuf.left);
 743                         }
 744                 else
 745                         {
 746                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 747                         i= -1;
 748                         }
 749                 if (i == s->s3->wbuf.left)
 750                         {
 751                         s->s3->wbuf.left=0;
 752                         s->rwstate=SSL_NOTHING;
 753                         return(s->s3->wpend_ret);
 754                         }
 755                 else if (i <= 0)
 756                         return(i);
 757                 s->s3->wbuf.offset+=i;
 758                 s->s3->wbuf.left-=i;
 759                 }
 760         }
 761
 762 /* Return up to 'len' payload bytes received in 'type' records.
 763  * 'type' is one of the following:
 764  *
 765  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 766  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 767  *   -  0 (during a shutdown, no data has to be returned)
 768  *
 769  * If we don't have stored data to work from, read a SSL/TLS record first
 770  * (possibly multiple records if we still don't have anything to return).
 771  *
 772  * This function must handle any surprises the peer may have for us, such as
 773  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 774  * a surprise, but handled as if it were), or renegotiation requests.
 775  * Also if record payloads contain fragments too small to process, we store
 776  * them until there is enough for the respective protocol (the record protocol
 777  * may use arbitrary fragmentation and even interleaving):
 778  *     Change cipher spec protocol
 779  *             just 1 byte needed, no need for keeping anything stored
 780  *     Alert protocol
 781  *             2 bytes needed (AlertLevel, AlertDescription)
 782  *     Handshake protocol
 783  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 784  *             to detect unexpected Client Hello and Hello Request messages
 785  *             here, anything else is handled by higher layers
 786  *     Application data protocol
 787  *             none of our business
 788  */
 789 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 790         {
 791         int al,i,j,ret;
 792         unsigned int n;
 793         SSL3_RECORD *rr;
 794         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 795
 796         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 797                 if (!ssl3_setup_buffers(s))
 798                         return(-1);
 799
 800         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 801             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 802                 {
 803                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 804                 return -1;
 805                 }
 806
 807         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 808                 /* (partially) satisfy request from storage */
 809                 {
 810                 unsigned char *src = s->s3->handshake_fragment;
 811                 unsigned char *dst = buf;
 812                 unsigned int k;
 813
 814                 /* peek == 0 */
 815                 n = 0;
 816                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 817                         {
 818                         *dst++ = *src++;
 819                         len--; s->s3->handshake_fragment_len--;
 820                         n++;
 821                         }
 822                 /* move any remaining fragment bytes: */
 823                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 824                         s->s3->handshake_fragment[k] = *src++;
 825                 return n;
 826         }
 827
 828         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 829
 830         if (!s->in_handshake && SSL_in_init(s))
 831                 {
 832                 /* type == SSL3_RT_APPLICATION_DATA */
 833                 i=s->handshake_func(s);
 834                 if (i < 0) return(i);
 835                 if (i == 0)
 836                         {
 837                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 838                         return(-1);
 839                         }
 840                 }
 841 start:
 842         s->rwstate=SSL_NOTHING;
 843
 844         /* s->s3->rrec.type         - is the type of record
 845          * s->s3->rrec.data,    - data
 846          * s->s3->rrec.off,     - offset into 'data' for next read
 847          * s->s3->rrec.length,  - number of bytes. */
 848         rr = &(s->s3->rrec);
 849
 850         /* get new packet if necessary */
 851         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 852                 {
 853                 ret=ssl3_get_record(s);
 854                 if (ret <= 0) return(ret);
 855                 }
 856
 857         /* we now have a packet which can be read and processed */
 858
 859         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 860                                        * reset by ssl3_get_finished */
 861                 && (rr->type != SSL3_RT_HANDSHAKE))
 862                 {
 863                 al=SSL_AD_UNEXPECTED_MESSAGE;
 864                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 865                 goto f_err;
 866                 }
 867
 868         /* If the other end has shut down, throw anything we read away
 869          * (even in 'peek' mode) */
 870         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 871                 {
 872                 rr->length=0;
 873                 s->rwstate=SSL_NOTHING;
 874                 return(0);
 875                 }
 876
 877
 878         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 879                 {
 880                 /* make sure that we are not getting application data when we
 881                  * are doing a handshake for the first time */
 882                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 883                         (s->enc_read_ctx == NULL))
 884                         {
 885                         al=SSL_AD_UNEXPECTED_MESSAGE;
 886                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 887                         goto f_err;
 888                         }
 889
 890                 if (len <= 0) return(len);
 891
 892                 if ((unsigned int)len > rr->length)
 893                         n = rr->length;
 894                 else
 895                         n = (unsigned int)len;
 896
 897                 memcpy(buf,&(rr->data[rr->off]),n);
 898                 if (!peek)
 899                         {
 900                         rr->length-=n;
 901                         rr->off+=n;
 902                         if (rr->length == 0)
 903                                 {
 904                                 s->rstate=SSL_ST_READ_HEADER;
 905                                 rr->off=0;
 906                                 }
 907                         }
 908                 return(n);
 909                 }
 910
 911
 912         /* If we get here, then type != rr->type; if we have a handshake
 913          * message, then it was unexpected (Hello Request or Client Hello). */
 914
 915         /* In case of record types for which we have 'fragment' storage,
 916          * fill that so that we can process the data at a fixed place.
 917          */
 918                 {
 919                 unsigned int dest_maxlen = 0;
 920                 unsigned char *dest = NULL;
 921                 unsigned int *dest_len = NULL;
 922
 923                 if (rr->type == SSL3_RT_HANDSHAKE)
 924                         {
 925                         dest_maxlen = sizeof s->s3->handshake_fragment;
 926                         dest = s->s3->handshake_fragment;
 927                         dest_len = &s->s3->handshake_fragment_len;
 928                         }
 929                 else if (rr->type == SSL3_RT_ALERT)
 930                         {
 931                         dest_maxlen = sizeof s->s3->alert_fragment;
 932                         dest = s->s3->alert_fragment;
 933                         dest_len = &s->s3->alert_fragment_len;
 934                         }
 935
 936                 if (dest_maxlen > 0)
 937                         {
 938                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
 939                         if (rr->length < n)
 940                                 n = rr->length; /* available bytes */
 941
 942                         /* now move 'n' bytes: */
 943                         while (n-- > 0)
 944                                 {
 945                                 dest[(*dest_len)++] = rr->data[rr->off++];
 946                                 rr->length--;
 947                                 }
 948
 949                         if (*dest_len < dest_maxlen)
 950                                 goto start; /* fragment was too small */
 951                         }
 952                 }
 953
 954         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
 955          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
 956          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 957
 958         /* If we are a client, check for an incoming 'Hello Request': */
 959         if ((!s->server) &&
 960                 (s->s3->handshake_fragment_len >= 4) &&
 961                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 962                 (s->session != NULL) && (s->session->cipher != NULL))
 963                 {
 964                 s->s3->handshake_fragment_len = 0;
 965
 966                 if ((s->s3->handshake_fragment[1] != 0) ||
 967                         (s->s3->handshake_fragment[2] != 0) ||
 968                         (s->s3->handshake_fragment[3] != 0))
 969                         {
 970                         al=SSL_AD_DECODE_ERROR;
 971                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 972                         goto f_err;
 973                         }
 974
 975                 if (s->msg_callback)
 976                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
 977
 978                 if (SSL_is_init_finished(s) &&
 979                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 980                         !s->s3->renegotiate)
 981                         {
 982                         ssl3_renegotiate(s);
 983                         if (ssl3_renegotiate_check(s))
 984                                 {
 985                                 i=s->handshake_func(s);
 986                                 if (i < 0) return(i);
 987                                 if (i == 0)
 988                                         {
 989                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 990                                         return(-1);
 991                                         }
 992
 993                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 994                                         {
 995                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 996                                                 {
 997                                                 BIO *bio;
 998                                                 /* In the case where we try to read application data,
 999                                                  * but we trigger an SSL handshake, we return -1 with
1000                                                  * the retry option set.  Otherwise renegotiation may
1001                                                  * cause nasty problems in the blocking world */
1002                                                 s->rwstate=SSL_READING;
1003                                                 bio=SSL_get_rbio(s);
1004                                                 BIO_clear_retry_flags(bio);
1005                                                 BIO_set_retry_read(bio);
1006                                                 return(-1);
1007                                                 }
1008                                         }
1009                                 }
1010                         }
1011                 /* we either finished a handshake or ignored the request,
1012                  * now try again to obtain the (application) data we were asked for */
1013                 goto start;
1014                 }
1015
1016         if (s->s3->alert_fragment_len >= 2)
1017                 {
1018                 int alert_level = s->s3->alert_fragment[0];
1019                 int alert_descr = s->s3->alert_fragment[1];
1020
1021                 s->s3->alert_fragment_len = 0;
1022
1023                 if (s->msg_callback)
1024                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1025
1026                 if (s->info_callback != NULL)
1027                         cb=s->info_callback;
1028                 else if (s->ctx->info_callback != NULL)
1029                         cb=s->ctx->info_callback;
1030
1031                 if (cb != NULL)
1032                         {
1033                         j = (alert_level << 8) | alert_descr;
1034                         cb(s, SSL_CB_READ_ALERT, j);
1035                         }
1036
1037                 if (alert_level == 1) /* warning */
1038                         {
1039                         s->s3->warn_alert = alert_descr;
1040                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1041                                 {
1042                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1043                                 return(0);
1044                                 }
1045                         }
1046                 else if (alert_level == 2) /* fatal */
1047                         {
1048                         char tmp[16];
1049
1050                         s->rwstate=SSL_NOTHING;
1051                         s->s3->fatal_alert = alert_descr;
1052                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1053                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1054                         ERR_add_error_data(2,"SSL alert number ",tmp);
1055                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1056                         SSL_CTX_remove_session(s->ctx,s->session);
1057                         return(0);
1058                         }
1059                 else
1060                         {
1061                         al=SSL_AD_ILLEGAL_PARAMETER;
1062                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1063                         goto f_err;
1064                         }
1065
1066                 goto start;
1067                 }
1068
1069         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1070                 {
1071                 s->rwstate=SSL_NOTHING;
1072                 rr->length=0;
1073                 return(0);
1074                 }
1075
1076         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1077                 {
1078                 /* 'Change Cipher Spec' is just a single byte, so we know
1079                  * exactly what the record payload has to look like */
1080                 if (    (rr->length != 1) || (rr->off != 0) ||
1081                         (rr->data[0] != SSL3_MT_CCS))
1082                         {
1083                         al=SSL_AD_ILLEGAL_PARAMETER;
1084                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1085                         goto f_err;
1086                         }
1087
1088                 rr->length=0;
1089
1090                 if (s->msg_callback)
1091                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1092
1093                 s->s3->change_cipher_spec=1;
1094                 if (!do_change_cipher_spec(s))
1095                         goto err;
1096                 else
1097                         goto start;
1098                 }
1099
1100         /* Unexpected handshake message (Client Hello, or protocol violation) */
1101         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1102                 {
1103                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1104                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1105                         {
1106 #if 0 /* worked only because C operator preferences are not as expected (and
1107        * because this is not really needed for clients except for detecting
1108        * protocol violations): */
1109                         s->state=SSL_ST_BEFORE|(s->server)
1110                                 ?SSL_ST_ACCEPT
1111                                 :SSL_ST_CONNECT;
1112 #else
1113                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1114 #endif
1115                         s->new_session=1;
1116                         }
1117                 i=s->handshake_func(s);
1118                 if (i < 0) return(i);
1119                 if (i == 0)
1120                         {
1121                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1122                         return(-1);
1123                         }
1124
1125                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1126                         {
1127                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1128                                 {
1129                                 BIO *bio;
1130                                 /* In the case where we try to read application data,
1131                                  * but we trigger an SSL handshake, we return -1 with
1132                                  * the retry option set.  Otherwise renegotiation may
1133                                  * cause nasty problems in the blocking world */
1134                                 s->rwstate=SSL_READING;
1135                                 bio=SSL_get_rbio(s);
1136                                 BIO_clear_retry_flags(bio);
1137                                 BIO_set_retry_read(bio);
1138                                 return(-1);
1139                                 }
1140                         }
1141                 goto start;
1142                 }
1143
1144         switch (rr->type)
1145                 {
1146         default:
1147 #ifndef OPENSSL_NO_TLS
1148                 /* TLS just ignores unknown message types */
1149                 if (s->version == TLS1_VERSION)
1150                         {
1151                         rr->length = 0;
1152                         goto start;
1153                         }
1154 #endif
1155                 al=SSL_AD_UNEXPECTED_MESSAGE;
1156                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1157                 goto f_err;
1158         case SSL3_RT_CHANGE_CIPHER_SPEC:
1159         case SSL3_RT_ALERT:
1160         case SSL3_RT_HANDSHAKE:
1161                 /* we already handled all of these, with the possible exception
1162                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1163                  * should not happen when type != rr->type */
1164                 al=SSL_AD_UNEXPECTED_MESSAGE;
1165                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1166                 goto f_err;
1167         case SSL3_RT_APPLICATION_DATA:
1168                 /* At this point, we were expecting handshake data,
1169                  * but have application data.  If the library was
1170                  * running inside ssl3_read() (i.e. in_read_app_data
1171                  * is set) and it makes sense to read application data
1172                  * at this point (session renegotiation not yet started),
1173                  * we will indulge it.
1174                  */
1175                 if (s->s3->in_read_app_data &&
1176                         (s->s3->total_renegotiations != 0) &&
1177                         ((
1178                                 (s->state & SSL_ST_CONNECT) &&
1179                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1180                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1181                                 ) || (
1182                                         (s->state & SSL_ST_ACCEPT) &&
1183                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1184                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1185                                         )
1186                                 ))
1187                         {
1188                         s->s3->in_read_app_data=2;
1189                         return(-1);
1190                         }
1191                 else
1192                         {
1193                         al=SSL_AD_UNEXPECTED_MESSAGE;
1194                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1195                         goto f_err;
1196                         }
1197                 }
1198         /* not reached */
1199
1200 f_err:
1201         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1202 err:
1203         return(-1);
1204         }
1205
1206 static int do_change_cipher_spec(SSL *s)
1207         {
1208         int i;
1209         const char *sender;
1210         int slen;
1211
1212         if (s->state & SSL_ST_ACCEPT)
1213                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1214         else
1215                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1216
1217         if (s->s3->tmp.key_block == NULL)
1218                 {
1219                 s->session->cipher=s->s3->tmp.new_cipher;
1220                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1221                 }
1222
1223         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1224                 return(0);
1225
1226         /* we have to record the message digest at
1227          * this point so we can get it before we read
1228          * the finished message */
1229         if (s->state & SSL_ST_CONNECT)
1230                 {
1231                 sender=s->method->ssl3_enc->server_finished_label;
1232                 slen=s->method->ssl3_enc->server_finished_label_len;
1233                 }
1234         else
1235                 {
1236                 sender=s->method->ssl3_enc->client_finished_label;
1237                 slen=s->method->ssl3_enc->client_finished_label_len;
1238                 }
1239
1240         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1241                 &(s->s3->finish_dgst1),
1242                 &(s->s3->finish_dgst2),
1243                 sender,slen,s->s3->tmp.peer_finish_md);
1244
1245         return(1);
1246         }
1247
1248 void ssl3_send_alert(SSL *s, int level, int desc)
1249         {
1250         /* Map tls/ssl alert value to correct one */
1251         desc=s->method->ssl3_enc->alert_value(desc);
1252         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1253                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1254         if (desc < 0) return;
1255         /* If a fatal one, remove from cache */
1256         if ((level == 2) && (s->session != NULL))
1257                 SSL_CTX_remove_session(s->ctx,s->session);
1258
1259         s->s3->alert_dispatch=1;
1260         s->s3->send_alert[0]=level;
1261         s->s3->send_alert[1]=desc;
1262         if (s->s3->wbuf.left == 0) /* data still being written out? */
1263                 ssl3_dispatch_alert(s);
1264         /* else data is still being written out, we will get written
1265          * some time in the future */
1266         }
1267
1268 int ssl3_dispatch_alert(SSL *s)
1269         {
1270         int i,j;
1271         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1272
1273         s->s3->alert_dispatch=0;
1274         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1275         if (i <= 0)
1276                 {
1277                 s->s3->alert_dispatch=1;
1278                 }
1279         else
1280                 {
1281                 /* Alert sent to BIO.  If it is important, flush it now.
1282                  * If the message does not get sent due to non-blocking IO,
1283                  * we will not worry too much. */
1284                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1285                         (void)BIO_flush(s->wbio);
1286
1287                 if (s->msg_callback)
1288                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1289
1290                 if (s->info_callback != NULL)
1291                         cb=s->info_callback;
1292                 else if (s->ctx->info_callback != NULL)
1293                         cb=s->ctx->info_callback;
1294
1295                 if (cb != NULL)
1296                         {
1297                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1298                         cb(s,SSL_CB_WRITE_ALERT,j);
1299                         }
1300                 }
1301         return(i);
1302         }