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                         if (version != s->version)
 281                                 {
 282                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 283                                 /* Send back error using their
 284                                  * version number :-) */
 285                                 s->version=version;
 286                                 al=SSL_AD_PROTOCOL_VERSION;
 287                                 goto f_err;
 288                                 }
 289                         }
 290
 291                 if ((version>>8) != SSL3_VERSION_MAJOR)
 292                         {
 293                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 294                         goto err;
 295                         }
 296
 297                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 298                         {
 299                         al=SSL_AD_RECORD_OVERFLOW;
 300                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 301                         goto f_err;
 302                         }
 303
 304                 /* now s->rstate == SSL_ST_READ_BODY */
 305                 }
 306
 307         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 308
 309         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 310                 {
 311                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 312                 i=rr->length;
 313                 n=ssl3_read_n(s,i,i,1);
 314                 if (n <= 0) return(n); /* error or non-blocking io */
 315                 /* now n == rr->length,
 316                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 317                 }
 318
 319         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 320
 321         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 322          * and we have that many bytes in s->packet
 323          */
 324         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 325
 326         /* ok, we can now read from 's->packet' data into 'rr'
 327          * rr->input points at rr->length bytes, which
 328          * need to be copied into rr->data by either
 329          * the decryption or by the decompression
 330          * When the data is 'copied' into the rr->data buffer,
 331          * rr->input will be pointed at the new buffer */
 332
 333         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 334          * rr->length bytes of encrypted compressed stuff. */
 335
 336         /* check is not needed I believe */
 337         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 338                 {
 339                 al=SSL_AD_RECORD_OVERFLOW;
 340                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 341                 goto f_err;
 342                 }
 343
 344         /* decrypt in place in 'rr->input' */
 345         rr->data=rr->input;
 346
 347         enc_err = s->method->ssl3_enc->enc(s,0);
 348         if (enc_err <= 0)
 349                 {
 350                 if (enc_err == 0)
 351                         /* SSLerr() and ssl3_send_alert() have been called */
 352                         goto err;
 353
 354                 /* Otherwise enc_err == -1, which indicates bad padding
 355                  * (rec->length has not been changed in this case).
 356                  * To minimize information leaked via timing, we will perform
 357                  * the MAC computation anyway. */
 358                 decryption_failed_or_bad_record_mac = 1;
 359                 }
 360
 361 #ifdef TLS_DEBUG
 362 printf("dec %d\n",rr->length);
 363 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 364 printf("\n");
 365 #endif
 366
 367         /* r->length is now the compressed data plus mac */
 368         if (    (sess == NULL) ||
 369                 (s->enc_read_ctx == NULL) ||
 370                 (s->read_hash == NULL))
 371                 clear=1;
 372
 373         if (!clear)
 374                 {
 375                 mac_size=EVP_MD_size(s->read_hash);
 376
 377                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 378                         {
 379 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 380                         al=SSL_AD_RECORD_OVERFLOW;
 381                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 382                         goto f_err;
 383 #else
 384                         decryption_failed_or_bad_record_mac = 1;
 385 #endif
 386                         }
 387                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 388                 if (rr->length >= mac_size)
 389                         {
 390                         rr->length -= mac_size;
 391                         mac = &rr->data[rr->length];
 392                         }
 393                 else
 394                         {
 395                         /* record (minus padding) is too short to contain a MAC */
 396 #if 0 /* OK only for stream ciphers */
 397                         al=SSL_AD_DECODE_ERROR;
 398                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 399                         goto f_err;
 400 #else
 401                         decryption_failed_or_bad_record_mac = 1;
 402                         rr->length = 0;
 403 #endif
 404                         }
 405                 i=s->method->ssl3_enc->mac(s,md,0);
 406                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 407                         {
 408                         decryption_failed_or_bad_record_mac = 1;
 409                         }
 410                 }
 411
 412         if (decryption_failed_or_bad_record_mac)
 413                 {
 414                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 415                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 416                  * failure is directly visible from the ciphertext anyway,
 417                  * we should not reveal which kind of error occured -- this
 418                  * might become visible to an attacker (e.g. via a logfile) */
 419                 al=SSL_AD_BAD_RECORD_MAC;
 420                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 421                 goto f_err;
 422                 }
 423
 424         /* r->length is now just compressed */
 425         if (s->expand != NULL)
 426                 {
 427                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 428                         {
 429                         al=SSL_AD_RECORD_OVERFLOW;
 430                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 431                         goto f_err;
 432                         }
 433                 if (!do_uncompress(s))
 434                         {
 435                         al=SSL_AD_DECOMPRESSION_FAILURE;
 436                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 437                         goto f_err;
 438                         }
 439                 }
 440
 441         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 442                 {
 443                 al=SSL_AD_RECORD_OVERFLOW;
 444                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 445                 goto f_err;
 446                 }
 447
 448         rr->off=0;
 449         /* So at this point the following is true
 450          * ssl->s3->rrec.type   is the type of record
 451          * ssl->s3->rrec.length == number of bytes in record
 452          * ssl->s3->rrec.off    == offset to first valid byte
 453          * ssl->s3->rrec.data   == where to take bytes from, increment
 454          *                         after use :-).
 455          */
 456
 457         /* we have pulled in a full packet so zero things */
 458         s->packet_length=0;
 459
 460         /* just read a 0 length packet */
 461         if (rr->length == 0) goto again;
 462
 463         return(1);
 464
 465 f_err:
 466         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 467 err:
 468         return(ret);
 469         }
 470
 471 static int do_uncompress(SSL *ssl)
 472         {
 473         int i;
 474         SSL3_RECORD *rr;
 475
 476         rr= &(ssl->s3->rrec);
 477         i=COMP_expand_block(ssl->expand,rr->comp,
 478                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 479         if (i < 0)
 480                 return(0);
 481         else
 482                 rr->length=i;
 483         rr->data=rr->comp;
 484
 485         return(1);
 486         }
 487
 488 static int do_compress(SSL *ssl)
 489         {
 490         int i;
 491         SSL3_RECORD *wr;
 492
 493         wr= &(ssl->s3->wrec);
 494         i=COMP_compress_block(ssl->compress,wr->data,
 495                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 496                 wr->input,(int)wr->length);
 497         if (i < 0)
 498                 return(0);
 499         else
 500                 wr->length=i;
 501
 502         wr->input=wr->data;
 503         return(1);
 504         }
 505
 506 /* Call this to write data in records of type 'type'
 507  * It will return <= 0 if not all data has been sent or non-blocking IO.
 508  */
 509 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 510         {
 511         const unsigned char *buf=buf_;
 512         unsigned int tot,n,nw;
 513         int i;
 514
 515         s->rwstate=SSL_NOTHING;
 516         tot=s->s3->wnum;
 517         s->s3->wnum=0;
 518
 519         if (SSL_in_init(s) && !s->in_handshake)
 520                 {
 521                 i=s->handshake_func(s);
 522                 if (i < 0) return(i);
 523                 if (i == 0)
 524                         {
 525                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 526                         return -1;
 527                         }
 528                 }
 529
 530         n=(len-tot);
 531         for (;;)
 532                 {
 533                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 534                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 535                 else
 536                         nw=n;
 537
 538                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 539                 if (i <= 0)
 540                         {
 541                         s->s3->wnum=tot;
 542                         return i;
 543                         }
 544
 545                 if ((i == (int)n) ||
 546                         (type == SSL3_RT_APPLICATION_DATA &&
 547                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 548                         {
 549                         /* next chunk of data should get another prepended empty fragment
 550                          * in ciphersuites with known-IV weakness: */
 551                         s->s3->empty_fragment_done = 0;
 552
 553                         return tot+i;
 554                         }
 555
 556                 n-=i;
 557                 tot+=i;
 558                 }
 559         }
 560
 561 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 562                          unsigned int len, int create_empty_fragment)
 563         {
 564         unsigned char *p,*plen;
 565         int i,mac_size,clear=0;
 566         int prefix_len = 0;
 567         SSL3_RECORD *wr;
 568         SSL3_BUFFER *wb;
 569         SSL_SESSION *sess;
 570
 571         /* first check if there is a SSL3_BUFFER still being written
 572          * out.  This will happen with non blocking IO */
 573         if (s->s3->wbuf.left != 0)
 574                 return(ssl3_write_pending(s,type,buf,len));
 575
 576         /* If we have an alert to send, lets send it */
 577         if (s->s3->alert_dispatch)
 578                 {
 579                 i=ssl3_dispatch_alert(s);
 580                 if (i <= 0)
 581                         return(i);
 582                 /* if it went, fall through and send more stuff */
 583                 }
 584
 585         if (len == 0 && !create_empty_fragment)
 586                 return 0;
 587
 588         wr= &(s->s3->wrec);
 589         wb= &(s->s3->wbuf);
 590         sess=s->session;
 591
 592         if (    (sess == NULL) ||
 593                 (s->enc_write_ctx == NULL) ||
 594                 (s->write_hash == NULL))
 595                 clear=1;
 596
 597         if (clear)
 598                 mac_size=0;
 599         else
 600                 mac_size=EVP_MD_size(s->write_hash);
 601
 602         /* 'create_empty_fragment' is true only when this function calls itself */
 603         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 604                 {
 605                 /* countermeasure against known-IV weakness in CBC ciphersuites
 606                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 607
 608                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 609                         {
 610                         /* recursive function call with 'create_empty_fragment' set;
 611                          * this prepares and buffers the data for an empty fragment
 612                          * (these 'prefix_len' bytes are sent out later
 613                          * together with the actual payload) */
 614                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 615                         if (prefix_len <= 0)
 616                                 goto err;
 617
 618                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
 619                                 {
 620                                 /* insufficient space */
 621                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 622                                 goto err;
 623                                 }
 624                         }
 625
 626                 s->s3->empty_fragment_done = 1;
 627                 }
 628
 629         p = wb->buf + prefix_len;
 630
 631         /* write the header */
 632
 633         *(p++)=type&0xff;
 634         wr->type=type;
 635
 636         *(p++)=(s->version>>8);
 637         *(p++)=s->version&0xff;
 638
 639         /* field where we are to write out packet length */
 640         plen=p;
 641         p+=2;
 642
 643         /* lets setup the record stuff. */
 644         wr->data=p;
 645         wr->length=(int)len;
 646         wr->input=(unsigned char *)buf;
 647
 648         /* we now 'read' from wr->input, wr->length bytes into
 649          * wr->data */
 650
 651         /* first we compress */
 652         if (s->compress != NULL)
 653                 {
 654                 if (!do_compress(s))
 655                         {
 656                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 657                         goto err;
 658                         }
 659                 }
 660         else
 661                 {
 662                 memcpy(wr->data,wr->input,wr->length);
 663                 wr->input=wr->data;
 664                 }
 665
 666         /* we should still have the output to wr->data and the input
 667          * from wr->input.  Length should be wr->length.
 668          * wr->data still points in the wb->buf */
 669
 670         if (mac_size != 0)
 671                 {
 672                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 673                 wr->length+=mac_size;
 674                 wr->input=p;
 675                 wr->data=p;
 676                 }
 677
 678         /* ssl3_enc can only have an error on read */
 679         s->method->ssl3_enc->enc(s,1);
 680
 681         /* record length after mac and block padding */
 682         s2n(wr->length,plen);
 683
 684         /* we should now have
 685          * wr->data pointing to the encrypted data, which is
 686          * wr->length long */
 687         wr->type=type; /* not needed but helps for debugging */
 688         wr->length+=SSL3_RT_HEADER_LENGTH;
 689
 690         if (create_empty_fragment)
 691                 {
 692                 /* we are in a recursive call;
 693                  * just return the length, don't write out anything here
 694                  */
 695                 return wr->length;
 696                 }
 697
 698         /* now let's set up wb */
 699         wb->left = prefix_len + wr->length;
 700         wb->offset = 0;
 701
 702         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 703         s->s3->wpend_tot=len;
 704         s->s3->wpend_buf=buf;
 705         s->s3->wpend_type=type;
 706         s->s3->wpend_ret=len;
 707
 708         /* we now just need to write the buffer */
 709         return ssl3_write_pending(s,type,buf,len);
 710 err:
 711         return -1;
 712         }
 713
 714 /* if s->s3->wbuf.left != 0, we need to call this */
 715 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 716                               unsigned int len)
 717         {
 718         int i;
 719
 720 /* XXXX */
 721         if ((s->s3->wpend_tot > (int)len)
 722                 || ((s->s3->wpend_buf != buf) &&
 723                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 724                 || (s->s3->wpend_type != type))
 725                 {
 726                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 727                 return(-1);
 728                 }
 729
 730         for (;;)
 731                 {
 732                 clear_sys_error();
 733                 if (s->wbio != NULL)
 734                         {
 735                         s->rwstate=SSL_WRITING;
 736                         i=BIO_write(s->wbio,
 737                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 738                                 (unsigned int)s->s3->wbuf.left);
 739                         }
 740                 else
 741                         {
 742                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 743                         i= -1;
 744                         }
 745                 if (i == s->s3->wbuf.left)
 746                         {
 747                         s->s3->wbuf.left=0;
 748                         s->rwstate=SSL_NOTHING;
 749                         return(s->s3->wpend_ret);
 750                         }
 751                 else if (i <= 0)
 752                         return(i);
 753                 s->s3->wbuf.offset+=i;
 754                 s->s3->wbuf.left-=i;
 755                 }
 756         }
 757
 758 /* Return up to 'len' payload bytes received in 'type' records.
 759  * 'type' is one of the following:
 760  *
 761  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 762  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 763  *   -  0 (during a shutdown, no data has to be returned)
 764  *
 765  * If we don't have stored data to work from, read a SSL/TLS record first
 766  * (possibly multiple records if we still don't have anything to return).
 767  *
 768  * This function must handle any surprises the peer may have for us, such as
 769  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 770  * a surprise, but handled as if it were), or renegotiation requests.
 771  * Also if record payloads contain fragments too small to process, we store
 772  * them until there is enough for the respective protocol (the record protocol
 773  * may use arbitrary fragmentation and even interleaving):
 774  *     Change cipher spec protocol
 775  *             just 1 byte needed, no need for keeping anything stored
 776  *     Alert protocol
 777  *             2 bytes needed (AlertLevel, AlertDescription)
 778  *     Handshake protocol
 779  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 780  *             to detect unexpected Client Hello and Hello Request messages
 781  *             here, anything else is handled by higher layers
 782  *     Application data protocol
 783  *             none of our business
 784  */
 785 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 786         {
 787         int al,i,j,ret;
 788         unsigned int n;
 789         SSL3_RECORD *rr;
 790         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 791
 792         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 793                 if (!ssl3_setup_buffers(s))
 794                         return(-1);
 795
 796         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 797             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 798                 {
 799                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 800                 return -1;
 801                 }
 802
 803         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 804                 /* (partially) satisfy request from storage */
 805                 {
 806                 unsigned char *src = s->s3->handshake_fragment;
 807                 unsigned char *dst = buf;
 808                 unsigned int k;
 809
 810                 /* peek == 0 */
 811                 n = 0;
 812                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 813                         {
 814                         *dst++ = *src++;
 815                         len--; s->s3->handshake_fragment_len--;
 816                         n++;
 817                         }
 818                 /* move any remaining fragment bytes: */
 819                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 820                         s->s3->handshake_fragment[k] = *src++;
 821                 return n;
 822         }
 823
 824         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 825
 826         if (!s->in_handshake && SSL_in_init(s))
 827                 {
 828                 /* type == SSL3_RT_APPLICATION_DATA */
 829                 i=s->handshake_func(s);
 830                 if (i < 0) return(i);
 831                 if (i == 0)
 832                         {
 833                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 834                         return(-1);
 835                         }
 836                 }
 837 start:
 838         s->rwstate=SSL_NOTHING;
 839
 840         /* s->s3->rrec.type         - is the type of record
 841          * s->s3->rrec.data,    - data
 842          * s->s3->rrec.off,     - offset into 'data' for next read
 843          * s->s3->rrec.length,  - number of bytes. */
 844         rr = &(s->s3->rrec);
 845
 846         /* get new packet if necessary */
 847         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 848                 {
 849                 ret=ssl3_get_record(s);
 850                 if (ret <= 0) return(ret);
 851                 }
 852
 853         /* we now have a packet which can be read and processed */
 854
 855         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 856                                        * reset by ssl3_get_finished */
 857                 && (rr->type != SSL3_RT_HANDSHAKE))
 858                 {
 859                 al=SSL_AD_UNEXPECTED_MESSAGE;
 860                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 861                 goto f_err;
 862                 }
 863
 864         /* If the other end has shut down, throw anything we read away
 865          * (even in 'peek' mode) */
 866         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 867                 {
 868                 rr->length=0;
 869                 s->rwstate=SSL_NOTHING;
 870                 return(0);
 871                 }
 872
 873
 874         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 875                 {
 876                 /* make sure that we are not getting application data when we
 877                  * are doing a handshake for the first time */
 878                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 879                         (s->enc_read_ctx == NULL))
 880                         {
 881                         al=SSL_AD_UNEXPECTED_MESSAGE;
 882                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 883                         goto f_err;
 884                         }
 885
 886                 if (len <= 0) return(len);
 887
 888                 if ((unsigned int)len > rr->length)
 889                         n = rr->length;
 890                 else
 891                         n = (unsigned int)len;
 892
 893                 memcpy(buf,&(rr->data[rr->off]),n);
 894                 if (!peek)
 895                         {
 896                         rr->length-=n;
 897                         rr->off+=n;
 898                         if (rr->length == 0)
 899                                 {
 900                                 s->rstate=SSL_ST_READ_HEADER;
 901                                 rr->off=0;
 902                                 }
 903                         }
 904                 return(n);
 905                 }
 906
 907
 908         /* If we get here, then type != rr->type; if we have a handshake
 909          * message, then it was unexpected (Hello Request or Client Hello). */
 910
 911         /* In case of record types for which we have 'fragment' storage,
 912          * fill that so that we can process the data at a fixed place.
 913          */
 914                 {
 915                 unsigned int dest_maxlen = 0;
 916                 unsigned char *dest = NULL;
 917                 unsigned int *dest_len = NULL;
 918
 919                 if (rr->type == SSL3_RT_HANDSHAKE)
 920                         {
 921                         dest_maxlen = sizeof s->s3->handshake_fragment;
 922                         dest = s->s3->handshake_fragment;
 923                         dest_len = &s->s3->handshake_fragment_len;
 924                         }
 925                 else if (rr->type == SSL3_RT_ALERT)
 926                         {
 927                         dest_maxlen = sizeof s->s3->alert_fragment;
 928                         dest = s->s3->alert_fragment;
 929                         dest_len = &s->s3->alert_fragment_len;
 930                         }
 931
 932                 if (dest_maxlen > 0)
 933                         {
 934                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
 935                         if (rr->length < n)
 936                                 n = rr->length; /* available bytes */
 937
 938                         /* now move 'n' bytes: */
 939                         while (n-- > 0)
 940                                 {
 941                                 dest[(*dest_len)++] = rr->data[rr->off++];
 942                                 rr->length--;
 943                                 }
 944
 945                         if (*dest_len < dest_maxlen)
 946                                 goto start; /* fragment was too small */
 947                         }
 948                 }
 949
 950         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
 951          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
 952          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 953
 954         /* If we are a client, check for an incoming 'Hello Request': */
 955         if ((!s->server) &&
 956                 (s->s3->handshake_fragment_len >= 4) &&
 957                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 958                 (s->session != NULL) && (s->session->cipher != NULL))
 959                 {
 960                 s->s3->handshake_fragment_len = 0;
 961
 962                 if ((s->s3->handshake_fragment[1] != 0) ||
 963                         (s->s3->handshake_fragment[2] != 0) ||
 964                         (s->s3->handshake_fragment[3] != 0))
 965                         {
 966                         al=SSL_AD_DECODE_ERROR;
 967                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 968                         goto f_err;
 969                         }
 970
 971                 if (s->msg_callback)
 972                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
 973
 974                 if (SSL_is_init_finished(s) &&
 975                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 976                         !s->s3->renegotiate)
 977                         {
 978                         ssl3_renegotiate(s);
 979                         if (ssl3_renegotiate_check(s))
 980                                 {
 981                                 i=s->handshake_func(s);
 982                                 if (i < 0) return(i);
 983                                 if (i == 0)
 984                                         {
 985                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 986                                         return(-1);
 987                                         }
 988
 989                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
 990                                         {
 991                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
 992                                                 {
 993                                                 BIO *bio;
 994                                                 /* In the case where we try to read application data,
 995                                                  * but we trigger an SSL handshake, we return -1 with
 996                                                  * the retry option set.  Otherwise renegotiation may
 997                                                  * cause nasty problems in the blocking world */
 998                                                 s->rwstate=SSL_READING;
 999                                                 bio=SSL_get_rbio(s);
1000                                                 BIO_clear_retry_flags(bio);
1001                                                 BIO_set_retry_read(bio);
1002                                                 return(-1);
1003                                                 }
1004                                         }
1005                                 }
1006                         }
1007                 /* we either finished a handshake or ignored the request,
1008                  * now try again to obtain the (application) data we were asked for */
1009                 goto start;
1010                 }
1011
1012         if (s->s3->alert_fragment_len >= 2)
1013                 {
1014                 int alert_level = s->s3->alert_fragment[0];
1015                 int alert_descr = s->s3->alert_fragment[1];
1016
1017                 s->s3->alert_fragment_len = 0;
1018
1019                 if (s->msg_callback)
1020                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1021
1022                 if (s->info_callback != NULL)
1023                         cb=s->info_callback;
1024                 else if (s->ctx->info_callback != NULL)
1025                         cb=s->ctx->info_callback;
1026
1027                 if (cb != NULL)
1028                         {
1029                         j = (alert_level << 8) | alert_descr;
1030                         cb(s, SSL_CB_READ_ALERT, j);
1031                         }
1032
1033                 if (alert_level == 1) /* warning */
1034                         {
1035                         s->s3->warn_alert = alert_descr;
1036                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1037                                 {
1038                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1039                                 return(0);
1040                                 }
1041                         }
1042                 else if (alert_level == 2) /* fatal */
1043                         {
1044                         char tmp[16];
1045
1046                         s->rwstate=SSL_NOTHING;
1047                         s->s3->fatal_alert = alert_descr;
1048                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1049                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1050                         ERR_add_error_data(2,"SSL alert number ",tmp);
1051                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1052                         SSL_CTX_remove_session(s->ctx,s->session);
1053                         return(0);
1054                         }
1055                 else
1056                         {
1057                         al=SSL_AD_ILLEGAL_PARAMETER;
1058                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1059                         goto f_err;
1060                         }
1061
1062                 goto start;
1063                 }
1064
1065         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1066                 {
1067                 s->rwstate=SSL_NOTHING;
1068                 rr->length=0;
1069                 return(0);
1070                 }
1071
1072         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1073                 {
1074                 /* 'Change Cipher Spec' is just a single byte, so we know
1075                  * exactly what the record payload has to look like */
1076                 if (    (rr->length != 1) || (rr->off != 0) ||
1077                         (rr->data[0] != SSL3_MT_CCS))
1078                         {
1079                         al=SSL_AD_ILLEGAL_PARAMETER;
1080                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1081                         goto f_err;
1082                         }
1083
1084                 /* Check we have a cipher to change to */
1085                 if (s->s3->tmp.new_cipher == NULL)
1086                         {
1087                         al=SSL_AD_UNEXPECTED_MESSAGE;
1088                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1089                         goto f_err;
1090                         }
1091
1092                 rr->length=0;
1093
1094                 if (s->msg_callback)
1095                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1096
1097                 s->s3->change_cipher_spec=1;
1098                 if (!do_change_cipher_spec(s))
1099                         goto err;
1100                 else
1101                         goto start;
1102                 }
1103
1104         /* Unexpected handshake message (Client Hello, or protocol violation) */
1105         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1106                 {
1107                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1108                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1109                         {
1110 #if 0 /* worked only because C operator preferences are not as expected (and
1111        * because this is not really needed for clients except for detecting
1112        * protocol violations): */
1113                         s->state=SSL_ST_BEFORE|(s->server)
1114                                 ?SSL_ST_ACCEPT
1115                                 :SSL_ST_CONNECT;
1116 #else
1117                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1118 #endif
1119                         s->new_session=1;
1120                         }
1121                 i=s->handshake_func(s);
1122                 if (i < 0) return(i);
1123                 if (i == 0)
1124                         {
1125                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1126                         return(-1);
1127                         }
1128
1129                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1130                         {
1131                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1132                                 {
1133                                 BIO *bio;
1134                                 /* In the case where we try to read application data,
1135                                  * but we trigger an SSL handshake, we return -1 with
1136                                  * the retry option set.  Otherwise renegotiation may
1137                                  * cause nasty problems in the blocking world */
1138                                 s->rwstate=SSL_READING;
1139                                 bio=SSL_get_rbio(s);
1140                                 BIO_clear_retry_flags(bio);
1141                                 BIO_set_retry_read(bio);
1142                                 return(-1);
1143                                 }
1144                         }
1145                 goto start;
1146                 }
1147
1148         switch (rr->type)
1149                 {
1150         default:
1151 #ifndef OPENSSL_NO_TLS
1152                 /* TLS just ignores unknown message types */
1153                 if (s->version == TLS1_VERSION)
1154                         {
1155                         rr->length = 0;
1156                         goto start;
1157                         }
1158 #endif
1159                 al=SSL_AD_UNEXPECTED_MESSAGE;
1160                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1161                 goto f_err;
1162         case SSL3_RT_CHANGE_CIPHER_SPEC:
1163         case SSL3_RT_ALERT:
1164         case SSL3_RT_HANDSHAKE:
1165                 /* we already handled all of these, with the possible exception
1166                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1167                  * should not happen when type != rr->type */
1168                 al=SSL_AD_UNEXPECTED_MESSAGE;
1169                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1170                 goto f_err;
1171         case SSL3_RT_APPLICATION_DATA:
1172                 /* At this point, we were expecting handshake data,
1173                  * but have application data.  If the library was
1174                  * running inside ssl3_read() (i.e. in_read_app_data
1175                  * is set) and it makes sense to read application data
1176                  * at this point (session renegotiation not yet started),
1177                  * we will indulge it.
1178                  */
1179                 if (s->s3->in_read_app_data &&
1180                         (s->s3->total_renegotiations != 0) &&
1181                         ((
1182                                 (s->state & SSL_ST_CONNECT) &&
1183                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1184                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1185                                 ) || (
1186                                         (s->state & SSL_ST_ACCEPT) &&
1187                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1188                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1189                                         )
1190                                 ))
1191                         {
1192                         s->s3->in_read_app_data=2;
1193                         return(-1);
1194                         }
1195                 else
1196                         {
1197                         al=SSL_AD_UNEXPECTED_MESSAGE;
1198                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1199                         goto f_err;
1200                         }
1201                 }
1202         /* not reached */
1203
1204 f_err:
1205         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1206 err:
1207         return(-1);
1208         }
1209
1210 static int do_change_cipher_spec(SSL *s)
1211         {
1212         int i;
1213         const char *sender;
1214         int slen;
1215
1216         if (s->state & SSL_ST_ACCEPT)
1217                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1218         else
1219                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1220
1221         if (s->s3->tmp.key_block == NULL)
1222                 {
1223                 s->session->cipher=s->s3->tmp.new_cipher;
1224                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1225                 }
1226
1227         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1228                 return(0);
1229
1230         /* we have to record the message digest at
1231          * this point so we can get it before we read
1232          * the finished message */
1233         if (s->state & SSL_ST_CONNECT)
1234                 {
1235                 sender=s->method->ssl3_enc->server_finished_label;
1236                 slen=s->method->ssl3_enc->server_finished_label_len;
1237                 }
1238         else
1239                 {
1240                 sender=s->method->ssl3_enc->client_finished_label;
1241                 slen=s->method->ssl3_enc->client_finished_label_len;
1242                 }
1243
1244         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1245                 &(s->s3->finish_dgst1),
1246                 &(s->s3->finish_dgst2),
1247                 sender,slen,s->s3->tmp.peer_finish_md);
1248
1249         return(1);
1250         }
1251
1252 void ssl3_send_alert(SSL *s, int level, int desc)
1253         {
1254         /* Map tls/ssl alert value to correct one */
1255         desc=s->method->ssl3_enc->alert_value(desc);
1256         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1257                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1258         if (desc < 0) return;
1259         /* If a fatal one, remove from cache */
1260         if ((level == 2) && (s->session != NULL))
1261                 SSL_CTX_remove_session(s->ctx,s->session);
1262
1263         s->s3->alert_dispatch=1;
1264         s->s3->send_alert[0]=level;
1265         s->s3->send_alert[1]=desc;
1266         if (s->s3->wbuf.left == 0) /* data still being written out? */
1267                 ssl3_dispatch_alert(s);
1268         /* else data is still being written out, we will get written
1269          * some time in the future */
1270         }
1271
1272 int ssl3_dispatch_alert(SSL *s)
1273         {
1274         int i,j;
1275         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1276
1277         s->s3->alert_dispatch=0;
1278         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1279         if (i <= 0)
1280                 {
1281                 s->s3->alert_dispatch=1;
1282                 }
1283         else
1284                 {
1285                 /* Alert sent to BIO.  If it is important, flush it now.
1286                  * If the message does not get sent due to non-blocking IO,
1287                  * we will not worry too much. */
1288                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1289                         (void)BIO_flush(s->wbio);
1290
1291                 if (s->msg_callback)
1292                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1293
1294                 if (s->info_callback != NULL)
1295                         cb=s->info_callback;
1296                 else if (s->ctx->info_callback != NULL)
1297                         cb=s->ctx->info_callback;
1298
1299                 if (cb != NULL)
1300                         {
1301                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1302                         cb(s,SSL_CB_WRITE_ALERT,j);
1303                         }
1304                 }
1305         return(i);
1306         }