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_get_record(SSL *s);
 122
 123 int ssl3_read_n(SSL *s, int n, int max, int extend)
 124         {
 125         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
 126          * packet by another n bytes.
 127          * The packet will be in the sub-array of s->s3->rbuf.buf specified
 128          * by s->packet and s->packet_length.
 129          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
 130          * [plus s->packet_length bytes if extend == 1].)
 131          */
 132         int i,off,newb;
 133
 134         if (!extend)
 135                 {
 136                 /* start with empty packet ... */
 137                 if (s->s3->rbuf.left == 0)
 138                         s->s3->rbuf.offset = 0;
 139                 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
 140                 s->packet_length = 0;
 141                 /* ... now we can act as if 'extend' was set */
 142                 }
 143
 144         /* For DTLS/UDP reads should not span multiple packets
 145          * because the read operation returns the whole packet
 146          * at once (as long as it fits into the buffer). */
 147         if (SSL_version(s) == DTLS1_VERSION)
 148                 {
 149                 if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left)
 150                         n = s->s3->rbuf.left;
 151                 }
 152
 153         /* if there is enough in the buffer from a previous read, take some */
 154         if (s->s3->rbuf.left >= (int)n)
 155                 {
 156                 s->packet_length+=n;
 157                 s->s3->rbuf.left-=n;
 158                 s->s3->rbuf.offset+=n;
 159                 return(n);
 160                 }
 161
 162         /* else we need to read more data */
 163         if (!s->read_ahead)
 164                 max=n;
 165
 166         {
 167                 /* avoid buffer overflow */
 168                 int max_max = s->s3->rbuf.len - s->packet_length;
 169                 if (max > max_max)
 170                         max = max_max;
 171         }
 172         if (n > max) /* does not happen */
 173                 {
 174                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 175                 return -1;
 176                 }
 177
 178         off = s->packet_length;
 179         newb = s->s3->rbuf.left;
 180         /* Move any available bytes to front of buffer:
 181          * 'off' bytes already pointed to by 'packet',
 182          * 'newb' extra ones at the end */
 183         if (s->packet != s->s3->rbuf.buf)
 184                 {
 185                 /*  off > 0 */
 186                 memmove(s->s3->rbuf.buf, s->packet, off+newb);
 187                 s->packet = s->s3->rbuf.buf;
 188                 }
 189
 190         while (newb < n)
 191                 {
 192                 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
 193                  * to read in more until we have off+n (up to off+max if possible) */
 194
 195                 clear_sys_error();
 196                 if (s->rbio != NULL)
 197                         {
 198                         s->rwstate=SSL_READING;
 199                         i=BIO_read(s->rbio,     &(s->s3->rbuf.buf[off+newb]), max-newb);
 200                         }
 201                 else
 202                         {
 203                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 204                         i = -1;
 205                         }
 206
 207                 if (i <= 0)
 208                         {
 209                         s->s3->rbuf.left = newb;
 210                         return(i);
 211                         }
 212                 newb+=i;
 213                 /* reads should *never* span multiple packets for DTLS because
 214                  * the underlying transport protocol is message oriented as opposed
 215                  * to byte oriented as in the TLS case. */
 216                 if (SSL_version(s) == DTLS1_VERSION)
 217                         {
 218                         if (n > newb)
 219                                 n = newb; /* makes the while condition false */
 220                         }
 221                 }
 222
 223         /* done reading, now the book-keeping */
 224         s->s3->rbuf.offset = off + n;
 225         s->s3->rbuf.left = newb - n;
 226         s->packet_length += n;
 227         s->rwstate=SSL_NOTHING;
 228         return(n);
 229         }
 230
 231 /* Call this to get a new input record.
 232  * It will return <= 0 if more data is needed, normally due to an error
 233  * or non-blocking IO.
 234  * When it finishes, one packet has been decoded and can be found in
 235  * ssl->s3->rrec.type    - is the type of record
 236  * ssl->s3->rrec.data,   - data
 237  * ssl->s3->rrec.length, - number of bytes
 238  */
 239 /* used only by ssl3_read_bytes */
 240 static int ssl3_get_record(SSL *s)
 241         {
 242         int ssl_major,ssl_minor,al;
 243         int enc_err,n,i,ret= -1;
 244         SSL3_RECORD *rr;
 245         SSL_SESSION *sess;
 246         unsigned char *p;
 247         unsigned char md[EVP_MAX_MD_SIZE];
 248         short version;
 249         unsigned int mac_size;
 250         int clear=0;
 251         size_t extra;
 252         int decryption_failed_or_bad_record_mac = 0;
 253         unsigned char *mac = NULL;
 254
 255         rr= &(s->s3->rrec);
 256         sess=s->session;
 257
 258         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 259                 extra=SSL3_RT_MAX_EXTRA;
 260         else
 261                 extra=0;
 262         if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE)
 263                 {
 264                 /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 265                  * set after ssl3_setup_buffers() was done */
 266                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 267                 return -1;
 268                 }
 269
 270 again:
 271         /* check if we have the header */
 272         if (    (s->rstate != SSL_ST_READ_BODY) ||
 273                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 274                 {
 275                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 276                 if (n <= 0) return(n); /* error or non-blocking */
 277                 s->rstate=SSL_ST_READ_BODY;
 278
 279                 p=s->packet;
 280
 281                 /* Pull apart the header into the SSL3_RECORD */
 282                 rr->type= *(p++);
 283                 ssl_major= *(p++);
 284                 ssl_minor= *(p++);
 285                 version=(ssl_major<<8)|ssl_minor;
 286                 n2s(p,rr->length);
 287
 288                 /* Lets check version */
 289                 if (!s->first_packet)
 290                         {
 291                         if (version != s->version)
 292                                 {
 293                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 294                                 if ((s->version & 0xFF00) == (version & 0xFF00))
 295                                         /* Send back error using their minor version number :-) */
 296                                         s->version = (unsigned short)version;
 297                                 al=SSL_AD_PROTOCOL_VERSION;
 298                                 goto f_err;
 299                                 }
 300                         }
 301
 302                 if ((version>>8) != SSL3_VERSION_MAJOR)
 303                         {
 304                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 305                         goto err;
 306                         }
 307
 308                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 309                         {
 310                         al=SSL_AD_RECORD_OVERFLOW;
 311                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 312                         goto f_err;
 313                         }
 314
 315                 /* now s->rstate == SSL_ST_READ_BODY */
 316                 }
 317
 318         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 319
 320         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 321                 {
 322                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 323                 i=rr->length;
 324                 n=ssl3_read_n(s,i,i,1);
 325                 if (n <= 0) return(n); /* error or non-blocking io */
 326                 /* now n == rr->length,
 327                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 328                 }
 329
 330         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 331
 332         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 333          * and we have that many bytes in s->packet
 334          */
 335         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 336
 337         /* ok, we can now read from 's->packet' data into 'rr'
 338          * rr->input points at rr->length bytes, which
 339          * need to be copied into rr->data by either
 340          * the decryption or by the decompression
 341          * When the data is 'copied' into the rr->data buffer,
 342          * rr->input will be pointed at the new buffer */
 343
 344         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 345          * rr->length bytes of encrypted compressed stuff. */
 346
 347         /* check is not needed I believe */
 348         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 349                 {
 350                 al=SSL_AD_RECORD_OVERFLOW;
 351                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 352                 goto f_err;
 353                 }
 354
 355         /* decrypt in place in 'rr->input' */
 356         rr->data=rr->input;
 357
 358         enc_err = s->method->ssl3_enc->enc(s,0);
 359         if (enc_err <= 0)
 360                 {
 361                 if (enc_err == 0)
 362                         /* SSLerr() and ssl3_send_alert() have been called */
 363                         goto err;
 364
 365                 /* Otherwise enc_err == -1, which indicates bad padding
 366                  * (rec->length has not been changed in this case).
 367                  * To minimize information leaked via timing, we will perform
 368                  * the MAC computation anyway. */
 369                 decryption_failed_or_bad_record_mac = 1;
 370                 }
 371
 372 #ifdef TLS_DEBUG
 373 printf("dec %d\n",rr->length);
 374 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 375 printf("\n");
 376 #endif
 377
 378         /* r->length is now the compressed data plus mac */
 379         if (    (sess == NULL) ||
 380                 (s->enc_read_ctx == NULL) ||
 381                 (s->read_hash == NULL))
 382                 clear=1;
 383
 384         if (!clear)
 385                 {
 386                 mac_size=EVP_MD_size(s->read_hash);
 387
 388                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 389                         {
 390 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 391                         al=SSL_AD_RECORD_OVERFLOW;
 392                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 393                         goto f_err;
 394 #else
 395                         decryption_failed_or_bad_record_mac = 1;
 396 #endif
 397                         }
 398                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 399                 if (rr->length >= mac_size)
 400                         {
 401                         rr->length -= mac_size;
 402                         mac = &rr->data[rr->length];
 403                         }
 404                 else
 405                         {
 406                         /* record (minus padding) is too short to contain a MAC */
 407 #if 0 /* OK only for stream ciphers */
 408                         al=SSL_AD_DECODE_ERROR;
 409                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 410                         goto f_err;
 411 #else
 412                         decryption_failed_or_bad_record_mac = 1;
 413                         rr->length = 0;
 414 #endif
 415                         }
 416                 i=s->method->ssl3_enc->mac(s,md,0);
 417                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 418                         {
 419                         decryption_failed_or_bad_record_mac = 1;
 420                         }
 421                 }
 422
 423         if (decryption_failed_or_bad_record_mac)
 424                 {
 425                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 426                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 427                  * failure is directly visible from the ciphertext anyway,
 428                  * we should not reveal which kind of error occured -- this
 429                  * might become visible to an attacker (e.g. via a logfile) */
 430                 al=SSL_AD_BAD_RECORD_MAC;
 431                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 432                 goto f_err;
 433                 }
 434
 435         /* r->length is now just compressed */
 436         if (s->expand != NULL)
 437                 {
 438                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 439                         {
 440                         al=SSL_AD_RECORD_OVERFLOW;
 441                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 442                         goto f_err;
 443                         }
 444                 if (!ssl3_do_uncompress(s))
 445                         {
 446                         al=SSL_AD_DECOMPRESSION_FAILURE;
 447                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 448                         goto f_err;
 449                         }
 450                 }
 451
 452         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 453                 {
 454                 al=SSL_AD_RECORD_OVERFLOW;
 455                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 456                 goto f_err;
 457                 }
 458
 459         rr->off=0;
 460         /* So at this point the following is true
 461          * ssl->s3->rrec.type   is the type of record
 462          * ssl->s3->rrec.length == number of bytes in record
 463          * ssl->s3->rrec.off    == offset to first valid byte
 464          * ssl->s3->rrec.data   == where to take bytes from, increment
 465          *                         after use :-).
 466          */
 467
 468         /* we have pulled in a full packet so zero things */
 469         s->packet_length=0;
 470
 471         /* just read a 0 length packet */
 472         if (rr->length == 0) goto again;
 473
 474         return(1);
 475
 476 f_err:
 477         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 478 err:
 479         return(ret);
 480         }
 481
 482 int ssl3_do_uncompress(SSL *ssl)
 483         {
 484 #ifndef OPENSSL_NO_COMP
 485         int i;
 486         SSL3_RECORD *rr;
 487
 488         rr= &(ssl->s3->rrec);
 489         i=COMP_expand_block(ssl->expand,rr->comp,
 490                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 491         if (i < 0)
 492                 return(0);
 493         else
 494                 rr->length=i;
 495         rr->data=rr->comp;
 496 #endif
 497         return(1);
 498         }
 499
 500 int ssl3_do_compress(SSL *ssl)
 501         {
 502 #ifndef OPENSSL_NO_COMP
 503         int i;
 504         SSL3_RECORD *wr;
 505
 506         wr= &(ssl->s3->wrec);
 507         i=COMP_compress_block(ssl->compress,wr->data,
 508                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 509                 wr->input,(int)wr->length);
 510         if (i < 0)
 511                 return(0);
 512         else
 513                 wr->length=i;
 514
 515         wr->input=wr->data;
 516 #endif
 517         return(1);
 518         }
 519
 520 /* Call this to write data in records of type 'type'
 521  * It will return <= 0 if not all data has been sent or non-blocking IO.
 522  */
 523 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 524         {
 525         const unsigned char *buf=buf_;
 526         unsigned int tot,n,nw;
 527         int i;
 528
 529         s->rwstate=SSL_NOTHING;
 530         tot=s->s3->wnum;
 531         s->s3->wnum=0;
 532
 533         if (SSL_in_init(s) && !s->in_handshake)
 534                 {
 535                 i=s->handshake_func(s);
 536                 if (i < 0) return(i);
 537                 if (i == 0)
 538                         {
 539                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 540                         return -1;
 541                         }
 542                 }
 543
 544         n=(len-tot);
 545         for (;;)
 546                 {
 547                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 548                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 549                 else
 550                         nw=n;
 551
 552                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 553                 if (i <= 0)
 554                         {
 555                         s->s3->wnum=tot;
 556                         return i;
 557                         }
 558
 559                 if ((i == (int)n) ||
 560                         (type == SSL3_RT_APPLICATION_DATA &&
 561                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 562                         {
 563                         /* next chunk of data should get another prepended empty fragment
 564                          * in ciphersuites with known-IV weakness: */
 565                         s->s3->empty_fragment_done = 0;
 566
 567                         return tot+i;
 568                         }
 569
 570                 n-=i;
 571                 tot+=i;
 572                 }
 573         }
 574
 575 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 576                          unsigned int len, int create_empty_fragment)
 577         {
 578         unsigned char *p,*plen;
 579         int i,mac_size,clear=0;
 580         int prefix_len = 0;
 581         SSL3_RECORD *wr;
 582         SSL3_BUFFER *wb;
 583         SSL_SESSION *sess;
 584
 585         /* first check if there is a SSL3_BUFFER still being written
 586          * out.  This will happen with non blocking IO */
 587         if (s->s3->wbuf.left != 0)
 588                 return(ssl3_write_pending(s,type,buf,len));
 589
 590         /* If we have an alert to send, lets send it */
 591         if (s->s3->alert_dispatch)
 592                 {
 593                 i=s->method->ssl_dispatch_alert(s);
 594                 if (i <= 0)
 595                         return(i);
 596                 /* if it went, fall through and send more stuff */
 597                 }
 598
 599         if (len == 0 && !create_empty_fragment)
 600                 return 0;
 601
 602         wr= &(s->s3->wrec);
 603         wb= &(s->s3->wbuf);
 604         sess=s->session;
 605
 606         if (    (sess == NULL) ||
 607                 (s->enc_write_ctx == NULL) ||
 608                 (s->write_hash == NULL))
 609                 clear=1;
 610
 611         if (clear)
 612                 mac_size=0;
 613         else
 614                 mac_size=EVP_MD_size(s->write_hash);
 615
 616         /* 'create_empty_fragment' is true only when this function calls itself */
 617         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 618                 {
 619                 /* countermeasure against known-IV weakness in CBC ciphersuites
 620                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 621
 622                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 623                         {
 624                         /* recursive function call with 'create_empty_fragment' set;
 625                          * this prepares and buffers the data for an empty fragment
 626                          * (these 'prefix_len' bytes are sent out later
 627                          * together with the actual payload) */
 628                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 629                         if (prefix_len <= 0)
 630                                 goto err;
 631
 632                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
 633                                 {
 634                                 /* insufficient space */
 635                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 636                                 goto err;
 637                                 }
 638                         }
 639
 640                 s->s3->empty_fragment_done = 1;
 641                 }
 642
 643         p = wb->buf + prefix_len;
 644
 645         /* write the header */
 646
 647         *(p++)=type&0xff;
 648         wr->type=type;
 649
 650         *(p++)=(s->version>>8);
 651         *(p++)=s->version&0xff;
 652
 653         /* field where we are to write out packet length */
 654         plen=p;
 655         p+=2;
 656
 657         /* lets setup the record stuff. */
 658         wr->data=p;
 659         wr->length=(int)len;
 660         wr->input=(unsigned char *)buf;
 661
 662         /* we now 'read' from wr->input, wr->length bytes into
 663          * wr->data */
 664
 665         /* first we compress */
 666         if (s->compress != NULL)
 667                 {
 668                 if (!ssl3_do_compress(s))
 669                         {
 670                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 671                         goto err;
 672                         }
 673                 }
 674         else
 675                 {
 676                 memcpy(wr->data,wr->input,wr->length);
 677                 wr->input=wr->data;
 678                 }
 679
 680         /* we should still have the output to wr->data and the input
 681          * from wr->input.  Length should be wr->length.
 682          * wr->data still points in the wb->buf */
 683
 684         if (mac_size != 0)
 685                 {
 686                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 687                 wr->length+=mac_size;
 688                 wr->input=p;
 689                 wr->data=p;
 690                 }
 691
 692         /* ssl3_enc can only have an error on read */
 693         s->method->ssl3_enc->enc(s,1);
 694
 695         /* record length after mac and block padding */
 696         s2n(wr->length,plen);
 697
 698         /* we should now have
 699          * wr->data pointing to the encrypted data, which is
 700          * wr->length long */
 701         wr->type=type; /* not needed but helps for debugging */
 702         wr->length+=SSL3_RT_HEADER_LENGTH;
 703
 704         if (create_empty_fragment)
 705                 {
 706                 /* we are in a recursive call;
 707                  * just return the length, don't write out anything here
 708                  */
 709                 return wr->length;
 710                 }
 711
 712         /* now let's set up wb */
 713         wb->left = prefix_len + wr->length;
 714         wb->offset = 0;
 715
 716         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 717         s->s3->wpend_tot=len;
 718         s->s3->wpend_buf=buf;
 719         s->s3->wpend_type=type;
 720         s->s3->wpend_ret=len;
 721
 722         /* we now just need to write the buffer */
 723         return ssl3_write_pending(s,type,buf,len);
 724 err:
 725         return -1;
 726         }
 727
 728 /* if s->s3->wbuf.left != 0, we need to call this */
 729 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 730         unsigned int len)
 731         {
 732         int i;
 733
 734 /* XXXX */
 735         if ((s->s3->wpend_tot > (int)len)
 736                 || ((s->s3->wpend_buf != buf) &&
 737                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 738                 || (s->s3->wpend_type != type))
 739                 {
 740                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 741                 return(-1);
 742                 }
 743
 744         for (;;)
 745                 {
 746                 clear_sys_error();
 747                 if (s->wbio != NULL)
 748                         {
 749                         s->rwstate=SSL_WRITING;
 750                         i=BIO_write(s->wbio,
 751                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 752                                 (unsigned int)s->s3->wbuf.left);
 753                         }
 754                 else
 755                         {
 756                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 757                         i= -1;
 758                         }
 759                 if (i == s->s3->wbuf.left)
 760                         {
 761                         s->s3->wbuf.left=0;
 762                         s->rwstate=SSL_NOTHING;
 763                         return(s->s3->wpend_ret);
 764                         }
 765                 else if (i <= 0) {
 766                         if (s->version == DTLS1_VERSION ||
 767                             s->version == DTLS1_BAD_VER) {
 768                                 /* For DTLS, just drop it. That's kind of the whole
 769                                    point in using a datagram service */
 770                                 s->s3->wbuf.left = 0;
 771                         }
 772                         return(i);
 773                 }
 774                 s->s3->wbuf.offset+=i;
 775                 s->s3->wbuf.left-=i;
 776                 }
 777         }
 778
 779 /* Return up to 'len' payload bytes received in 'type' records.
 780  * 'type' is one of the following:
 781  *
 782  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 783  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 784  *   -  0 (during a shutdown, no data has to be returned)
 785  *
 786  * If we don't have stored data to work from, read a SSL/TLS record first
 787  * (possibly multiple records if we still don't have anything to return).
 788  *
 789  * This function must handle any surprises the peer may have for us, such as
 790  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 791  * a surprise, but handled as if it were), or renegotiation requests.
 792  * Also if record payloads contain fragments too small to process, we store
 793  * them until there is enough for the respective protocol (the record protocol
 794  * may use arbitrary fragmentation and even interleaving):
 795  *     Change cipher spec protocol
 796  *             just 1 byte needed, no need for keeping anything stored
 797  *     Alert protocol
 798  *             2 bytes needed (AlertLevel, AlertDescription)
 799  *     Handshake protocol
 800  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 801  *             to detect unexpected Client Hello and Hello Request messages
 802  *             here, anything else is handled by higher layers
 803  *     Application data protocol
 804  *             none of our business
 805  */
 806 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 807         {
 808         int al,i,j,ret;
 809         unsigned int n;
 810         SSL3_RECORD *rr;
 811         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 812
 813         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 814                 if (!ssl3_setup_buffers(s))
 815                         return(-1);
 816
 817         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 818             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 819                 {
 820                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 821                 return -1;
 822                 }
 823
 824         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 825                 /* (partially) satisfy request from storage */
 826                 {
 827                 unsigned char *src = s->s3->handshake_fragment;
 828                 unsigned char *dst = buf;
 829                 unsigned int k;
 830
 831                 /* peek == 0 */
 832                 n = 0;
 833                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 834                         {
 835                         *dst++ = *src++;
 836                         len--; s->s3->handshake_fragment_len--;
 837                         n++;
 838                         }
 839                 /* move any remaining fragment bytes: */
 840                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 841                         s->s3->handshake_fragment[k] = *src++;
 842                 return n;
 843         }
 844
 845         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 846
 847         if (!s->in_handshake && SSL_in_init(s))
 848                 {
 849                 /* type == SSL3_RT_APPLICATION_DATA */
 850                 i=s->handshake_func(s);
 851                 if (i < 0) return(i);
 852                 if (i == 0)
 853                         {
 854                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 855                         return(-1);
 856                         }
 857                 }
 858 start:
 859         s->rwstate=SSL_NOTHING;
 860
 861         /* s->s3->rrec.type         - is the type of record
 862          * s->s3->rrec.data,    - data
 863          * s->s3->rrec.off,     - offset into 'data' for next read
 864          * s->s3->rrec.length,  - number of bytes. */
 865         rr = &(s->s3->rrec);
 866
 867         /* get new packet if necessary */
 868         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 869                 {
 870                 ret=ssl3_get_record(s);
 871                 if (ret <= 0) return(ret);
 872                 }
 873
 874         /* we now have a packet which can be read and processed */
 875
 876         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 877                                        * reset by ssl3_get_finished */
 878                 && (rr->type != SSL3_RT_HANDSHAKE))
 879                 {
 880                 al=SSL_AD_UNEXPECTED_MESSAGE;
 881                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 882                 goto f_err;
 883                 }
 884
 885         /* If the other end has shut down, throw anything we read away
 886          * (even in 'peek' mode) */
 887         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 888                 {
 889                 rr->length=0;
 890                 s->rwstate=SSL_NOTHING;
 891                 return(0);
 892                 }
 893
 894
 895         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 896                 {
 897                 /* make sure that we are not getting application data when we
 898                  * are doing a handshake for the first time */
 899                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 900                         (s->enc_read_ctx == NULL))
 901                         {
 902                         al=SSL_AD_UNEXPECTED_MESSAGE;
 903                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 904                         goto f_err;
 905                         }
 906
 907                 if (len <= 0) return(len);
 908
 909                 if ((unsigned int)len > rr->length)
 910                         n = rr->length;
 911                 else
 912                         n = (unsigned int)len;
 913
 914                 memcpy(buf,&(rr->data[rr->off]),n);
 915                 if (!peek)
 916                         {
 917                         rr->length-=n;
 918                         rr->off+=n;
 919                         if (rr->length == 0)
 920                                 {
 921                                 s->rstate=SSL_ST_READ_HEADER;
 922                                 rr->off=0;
 923                                 }
 924                         }
 925                 return(n);
 926                 }
 927
 928
 929         /* If we get here, then type != rr->type; if we have a handshake
 930          * message, then it was unexpected (Hello Request or Client Hello). */
 931
 932         /* In case of record types for which we have 'fragment' storage,
 933          * fill that so that we can process the data at a fixed place.
 934          */
 935                 {
 936                 unsigned int dest_maxlen = 0;
 937                 unsigned char *dest = NULL;
 938                 unsigned int *dest_len = NULL;
 939
 940                 if (rr->type == SSL3_RT_HANDSHAKE)
 941                         {
 942                         dest_maxlen = sizeof s->s3->handshake_fragment;
 943                         dest = s->s3->handshake_fragment;
 944                         dest_len = &s->s3->handshake_fragment_len;
 945                         }
 946                 else if (rr->type == SSL3_RT_ALERT)
 947                         {
 948                         dest_maxlen = sizeof s->s3->alert_fragment;
 949                         dest = s->s3->alert_fragment;
 950                         dest_len = &s->s3->alert_fragment_len;
 951                         }
 952
 953                 if (dest_maxlen > 0)
 954                         {
 955                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
 956                         if (rr->length < n)
 957                                 n = rr->length; /* available bytes */
 958
 959                         /* now move 'n' bytes: */
 960                         while (n-- > 0)
 961                                 {
 962                                 dest[(*dest_len)++] = rr->data[rr->off++];
 963                                 rr->length--;
 964                                 }
 965
 966                         if (*dest_len < dest_maxlen)
 967                                 goto start; /* fragment was too small */
 968                         }
 969                 }
 970
 971         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
 972          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
 973          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
 974
 975         /* If we are a client, check for an incoming 'Hello Request': */
 976         if ((!s->server) &&
 977                 (s->s3->handshake_fragment_len >= 4) &&
 978                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
 979                 (s->session != NULL) && (s->session->cipher != NULL))
 980                 {
 981                 s->s3->handshake_fragment_len = 0;
 982
 983                 if ((s->s3->handshake_fragment[1] != 0) ||
 984                         (s->s3->handshake_fragment[2] != 0) ||
 985                         (s->s3->handshake_fragment[3] != 0))
 986                         {
 987                         al=SSL_AD_DECODE_ERROR;
 988                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 989                         goto f_err;
 990                         }
 991
 992                 if (s->msg_callback)
 993                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
 994
 995                 if (SSL_is_init_finished(s) &&
 996                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 997                         !s->s3->renegotiate)
 998                         {
 999                         ssl3_renegotiate(s);
1000                         if (ssl3_renegotiate_check(s))
1001                                 {
1002                                 i=s->handshake_func(s);
1003                                 if (i < 0) return(i);
1004                                 if (i == 0)
1005                                         {
1006                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1007                                         return(-1);
1008                                         }
1009
1010                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1011                                         {
1012                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1013                                                 {
1014                                                 BIO *bio;
1015                                                 /* In the case where we try to read application data,
1016                                                  * but we trigger an SSL handshake, we return -1 with
1017                                                  * the retry option set.  Otherwise renegotiation may
1018                                                  * cause nasty problems in the blocking world */
1019                                                 s->rwstate=SSL_READING;
1020                                                 bio=SSL_get_rbio(s);
1021                                                 BIO_clear_retry_flags(bio);
1022                                                 BIO_set_retry_read(bio);
1023                                                 return(-1);
1024                                                 }
1025                                         }
1026                                 }
1027                         }
1028                 /* we either finished a handshake or ignored the request,
1029                  * now try again to obtain the (application) data we were asked for */
1030                 goto start;
1031                 }
1032         /* If we are a server and get a client hello when renegotiation isn't
1033          * allowed send back a no renegotiation alert and carry on.
1034          * WARNING: experimental code, needs reviewing (steve)
1035          */
1036         if (s->server &&
1037                 SSL_is_init_finished(s) &&
1038                 !s->s3->send_connection_binding &&
1039                 (s->version > SSL3_VERSION) &&
1040                 (s->s3->handshake_fragment_len >= 4) &&
1041                 (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
1042                 (s->session != NULL) && (s->session->cipher != NULL) &&
1043                 !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1044
1045                 {
1046                 /*s->s3->handshake_fragment_len = 0;*/
1047                 rr->length = 0;
1048                 ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
1049                 goto start;
1050                 }
1051         if (s->s3->alert_fragment_len >= 2)
1052                 {
1053                 int alert_level = s->s3->alert_fragment[0];
1054                 int alert_descr = s->s3->alert_fragment[1];
1055
1056                 s->s3->alert_fragment_len = 0;
1057
1058                 if (s->msg_callback)
1059                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1060
1061                 if (s->info_callback != NULL)
1062                         cb=s->info_callback;
1063                 else if (s->ctx->info_callback != NULL)
1064                         cb=s->ctx->info_callback;
1065
1066                 if (cb != NULL)
1067                         {
1068                         j = (alert_level << 8) | alert_descr;
1069                         cb(s, SSL_CB_READ_ALERT, j);
1070                         }
1071
1072                 if (alert_level == 1) /* warning */
1073                         {
1074                         s->s3->warn_alert = alert_descr;
1075                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1076                                 {
1077                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1078                                 return(0);
1079                                 }
1080                         /* This is a warning but we receive it if we requested
1081                          * renegotiation and the peer denied it. Terminate with
1082                          * a fatal alert because if application tried to
1083                          * renegotiatie it presumably had a good reason and
1084                          * expects it to succeed.
1085                          *
1086                          * In future we might have a renegotiation where we
1087                          * don't care if the peer refused it where we carry on.
1088                          */
1089                         else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
1090                                 {
1091                                 al = SSL_AD_HANDSHAKE_FAILURE;
1092                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION);
1093                                 goto f_err;
1094                                 }
1095                         }
1096                 else if (alert_level == 2) /* fatal */
1097                         {
1098                         char tmp[16];
1099
1100                         s->rwstate=SSL_NOTHING;
1101                         s->s3->fatal_alert = alert_descr;
1102                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1103                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1104                         ERR_add_error_data(2,"SSL alert number ",tmp);
1105                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1106                         SSL_CTX_remove_session(s->ctx,s->session);
1107                         return(0);
1108                         }
1109                 else
1110                         {
1111                         al=SSL_AD_ILLEGAL_PARAMETER;
1112                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1113                         goto f_err;
1114                         }
1115
1116                 goto start;
1117                 }
1118
1119         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1120                 {
1121                 s->rwstate=SSL_NOTHING;
1122                 rr->length=0;
1123                 return(0);
1124                 }
1125
1126         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1127                 {
1128                 /* 'Change Cipher Spec' is just a single byte, so we know
1129                  * exactly what the record payload has to look like */
1130                 if (    (rr->length != 1) || (rr->off != 0) ||
1131                         (rr->data[0] != SSL3_MT_CCS))
1132                         {
1133                         al=SSL_AD_ILLEGAL_PARAMETER;
1134                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1135                         goto f_err;
1136                         }
1137
1138                 /* Check we have a cipher to change to */
1139                 if (s->s3->tmp.new_cipher == NULL)
1140                         {
1141                         al=SSL_AD_UNEXPECTED_MESSAGE;
1142                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1143                         goto f_err;
1144                         }
1145
1146                 rr->length=0;
1147
1148                 if (s->msg_callback)
1149                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1150
1151                 s->s3->change_cipher_spec=1;
1152                 if (!ssl3_do_change_cipher_spec(s))
1153                         goto err;
1154                 else
1155                         goto start;
1156                 }
1157
1158         /* Unexpected handshake message (Client Hello, or protocol violation) */
1159         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1160                 {
1161                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1162                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1163                         {
1164 #if 0 /* worked only because C operator preferences are not as expected (and
1165        * because this is not really needed for clients except for detecting
1166        * protocol violations): */
1167                         s->state=SSL_ST_BEFORE|(s->server)
1168                                 ?SSL_ST_ACCEPT
1169                                 :SSL_ST_CONNECT;
1170 #else
1171                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1172 #endif
1173                         s->new_session=1;
1174                         }
1175                 i=s->handshake_func(s);
1176                 if (i < 0) return(i);
1177                 if (i == 0)
1178                         {
1179                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1180                         return(-1);
1181                         }
1182
1183                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1184                         {
1185                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1186                                 {
1187                                 BIO *bio;
1188                                 /* In the case where we try to read application data,
1189                                  * but we trigger an SSL handshake, we return -1 with
1190                                  * the retry option set.  Otherwise renegotiation may
1191                                  * cause nasty problems in the blocking world */
1192                                 s->rwstate=SSL_READING;
1193                                 bio=SSL_get_rbio(s);
1194                                 BIO_clear_retry_flags(bio);
1195                                 BIO_set_retry_read(bio);
1196                                 return(-1);
1197                                 }
1198                         }
1199                 goto start;
1200                 }
1201
1202         switch (rr->type)
1203                 {
1204         default:
1205 #ifndef OPENSSL_NO_TLS
1206                 /* TLS just ignores unknown message types */
1207                 if (s->version == TLS1_VERSION)
1208                         {
1209                         rr->length = 0;
1210                         goto start;
1211                         }
1212 #endif
1213                 al=SSL_AD_UNEXPECTED_MESSAGE;
1214                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1215                 goto f_err;
1216         case SSL3_RT_CHANGE_CIPHER_SPEC:
1217         case SSL3_RT_ALERT:
1218         case SSL3_RT_HANDSHAKE:
1219                 /* we already handled all of these, with the possible exception
1220                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1221                  * should not happen when type != rr->type */
1222                 al=SSL_AD_UNEXPECTED_MESSAGE;
1223                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1224                 goto f_err;
1225         case SSL3_RT_APPLICATION_DATA:
1226                 /* At this point, we were expecting handshake data,
1227                  * but have application data.  If the library was
1228                  * running inside ssl3_read() (i.e. in_read_app_data
1229                  * is set) and it makes sense to read application data
1230                  * at this point (session renegotiation not yet started),
1231                  * we will indulge it.
1232                  */
1233                 if (s->s3->in_read_app_data &&
1234                         (s->s3->total_renegotiations != 0) &&
1235                         ((
1236                                 (s->state & SSL_ST_CONNECT) &&
1237                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1238                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1239                                 ) || (
1240                                         (s->state & SSL_ST_ACCEPT) &&
1241                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1242                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1243                                         )
1244                                 ))
1245                         {
1246                         s->s3->in_read_app_data=2;
1247                         return(-1);
1248                         }
1249                 else
1250                         {
1251                         al=SSL_AD_UNEXPECTED_MESSAGE;
1252                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1253                         goto f_err;
1254                         }
1255                 }
1256         /* not reached */
1257
1258 f_err:
1259         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1260 err:
1261         return(-1);
1262         }
1263
1264 int ssl3_do_change_cipher_spec(SSL *s)
1265         {
1266         int i;
1267         const char *sender;
1268         int slen;
1269
1270         if (s->state & SSL_ST_ACCEPT)
1271                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1272         else
1273                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1274
1275         if (s->s3->tmp.key_block == NULL)
1276                 {
1277                 if (s->session == NULL)
1278                         {
1279                         /* might happen if dtls1_read_bytes() calls this */
1280                         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1281                         return (0);
1282                         }
1283
1284                 s->session->cipher=s->s3->tmp.new_cipher;
1285                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1286                 }
1287
1288         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1289                 return(0);
1290
1291         /* we have to record the message digest at
1292          * this point so we can get it before we read
1293          * the finished message */
1294         if (s->state & SSL_ST_CONNECT)
1295                 {
1296                 sender=s->method->ssl3_enc->server_finished_label;
1297                 slen=s->method->ssl3_enc->server_finished_label_len;
1298                 }
1299         else
1300                 {
1301                 sender=s->method->ssl3_enc->client_finished_label;
1302                 slen=s->method->ssl3_enc->client_finished_label_len;
1303                 }
1304
1305         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1306                 &(s->s3->finish_dgst1),
1307                 &(s->s3->finish_dgst2),
1308                 sender,slen,s->s3->tmp.peer_finish_md);
1309
1310         return(1);
1311         }
1312
1313 int ssl3_send_alert(SSL *s, int level, int desc)
1314         {
1315         /* Map tls/ssl alert value to correct one */
1316         desc=s->method->ssl3_enc->alert_value(desc);
1317         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1318                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1319         if (desc < 0) return -1;
1320         /* If a fatal one, remove from cache */
1321         if ((level == 2) && (s->session != NULL))
1322                 SSL_CTX_remove_session(s->ctx,s->session);
1323
1324         s->s3->alert_dispatch=1;
1325         s->s3->send_alert[0]=level;
1326         s->s3->send_alert[1]=desc;
1327         if (s->s3->wbuf.left == 0) /* data still being written out? */
1328                 return s->method->ssl_dispatch_alert(s);
1329         /* else data is still being written out, we will get written
1330          * some time in the future */
1331         return -1;
1332         }
1333
1334 int ssl3_dispatch_alert(SSL *s)
1335         {
1336         int i,j;
1337         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1338
1339         s->s3->alert_dispatch=0;
1340         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1341         if (i <= 0)
1342                 {
1343                 s->s3->alert_dispatch=1;
1344                 }
1345         else
1346                 {
1347                 /* Alert sent to BIO.  If it is important, flush it now.
1348                  * If the message does not get sent due to non-blocking IO,
1349                  * we will not worry too much. */
1350                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1351                         (void)BIO_flush(s->wbio);
1352
1353                 if (s->msg_callback)
1354                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1355
1356                 if (s->info_callback != NULL)
1357                         cb=s->info_callback;
1358                 else if (s->ctx->info_callback != NULL)
1359                         cb=s->ctx->info_callback;
1360
1361                 if (cb != NULL)
1362                         {
1363                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1364                         cb(s,SSL_CB_WRITE_ALERT,j);
1365                         }
1366                 }
1367         return(i);
1368         }