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