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,len,left,align=0;
 133         unsigned char *pkt;
 134         SSL3_BUFFER *rb;
 135
 136         if (n <= 0) return n;
 137
 138         rb    = &(s->s3->rbuf);
 139         left  = rb->left;
 140 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 141         align = (int)rb->buf + SSL3_RT_HEADER_LENGTH;
 142         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 143 #endif
 144
 145         if (!extend)
 146                 {
 147                 /* start with empty packet ... */
 148                 if (left == 0)
 149                         rb->offset = align;
 150                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
 151                         {
 152                         /* check if next packet length is large
 153                          * enough to justify payload alignment... */
 154                         pkt = rb->buf + rb->offset;
 155                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
 156                             && (pkt[3]<<8|pkt[4]) >= 128)
 157                                 {
 158                                 /* Note that even if packet is corrupted
 159                                  * and its length field is insane, we can
 160                                  * only be led to wrong decision about
 161                                  * whether memmove will occur or not.
 162                                  * Header values has no effect on memmove
 163                                  * arguments and therefore no buffer
 164                                  * overrun can be triggered. */
 165                                 memmove (rb->buf+align,pkt,left);
 166                                 rb->offset = align;
 167                                 }
 168                         }
 169                 s->packet = rb->buf + rb->offset;
 170                 s->packet_length = 0;
 171                 /* ... now we can act as if 'extend' was set */
 172                 }
 173
 174         /* extend reads should not span multiple packets for DTLS */
 175         if ( SSL_version(s) == DTLS1_VERSION &&
 176                 extend)
 177                 {
 178                 if ( left > 0 && n > left)
 179                         n = left;
 180                 }
 181
 182         /* if there is enough in the buffer from a previous read, take some */
 183         if (left >= n)
 184                 {
 185                 s->packet_length+=n;
 186                 rb->left=left-n;
 187                 rb->offset+=n;
 188                 return(n);
 189                 }
 190
 191         /* else we need to read more data */
 192
 193         len = s->packet_length;
 194         pkt = rb->buf+align;
 195         /* Move any available bytes to front of buffer:
 196          * 'len' bytes already pointed to by 'packet',
 197          * 'left' extra ones at the end */
 198         if (s->packet != pkt) /* len > 0 */
 199                 {
 200                 memmove(pkt, s->packet, len+left);
 201                 s->packet = pkt;
 202                 rb->offset = len + align;
 203                 }
 204
 205         max = rb->len - rb->offset;
 206         if (n > max) /* does not happen */
 207                 {
 208                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 209                 return -1;
 210                 }
 211
 212         if (!s->read_ahead)
 213                 max=n;
 214
 215         while (left < n)
 216                 {
 217                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
 218                  * and need to read in more until we have len+n (up to
 219                  * len+max if possible) */
 220
 221                 clear_sys_error();
 222                 if (s->rbio != NULL)
 223                         {
 224                         s->rwstate=SSL_READING;
 225                         i=BIO_read(s->rbio,pkt+len+left, max-left);
 226                         }
 227                 else
 228                         {
 229                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 230                         i = -1;
 231                         }
 232
 233                 if (i <= 0)
 234                         {
 235                         rb->left = left;
 236                         return(i);
 237                         }
 238                 left+=i;
 239                 }
 240
 241         /* done reading, now the book-keeping */
 242         rb->offset += n;
 243         rb->left = left - n;
 244         s->packet_length += n;
 245         s->rwstate=SSL_NOTHING;
 246         return(n);
 247         }
 248
 249 /* Call this to get a new input record.
 250  * It will return <= 0 if more data is needed, normally due to an error
 251  * or non-blocking IO.
 252  * When it finishes, one packet has been decoded and can be found in
 253  * ssl->s3->rrec.type    - is the type of record
 254  * ssl->s3->rrec.data,   - data
 255  * ssl->s3->rrec.length, - number of bytes
 256  */
 257 /* used only by ssl3_read_bytes */
 258 static int ssl3_get_record(SSL *s)
 259         {
 260         int ssl_major,ssl_minor,al;
 261         int enc_err,n,i,ret= -1;
 262         SSL3_RECORD *rr;
 263         SSL_SESSION *sess;
 264         unsigned char *p;
 265         unsigned char md[EVP_MAX_MD_SIZE];
 266         short version;
 267         unsigned int mac_size;
 268         int clear=0;
 269         size_t extra;
 270         int decryption_failed_or_bad_record_mac = 0;
 271         unsigned char *mac = NULL;
 272
 273         rr= &(s->s3->rrec);
 274         sess=s->session;
 275
 276         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 277                 extra=SSL3_RT_MAX_EXTRA;
 278         else
 279                 extra=0;
 280         if (extra && !s->s3->init_extra)
 281                 {
 282                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 283                  * set after ssl3_setup_buffers() was done */
 284                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 285                 return -1;
 286                 }
 287
 288 again:
 289         /* check if we have the header */
 290         if (    (s->rstate != SSL_ST_READ_BODY) ||
 291                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 292                 {
 293                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 294                 if (n <= 0) return(n); /* error or non-blocking */
 295                 s->rstate=SSL_ST_READ_BODY;
 296
 297                 p=s->packet;
 298
 299                 /* Pull apart the header into the SSL3_RECORD */
 300                 rr->type= *(p++);
 301                 ssl_major= *(p++);
 302                 ssl_minor= *(p++);
 303                 version=(ssl_major<<8)|ssl_minor;
 304                 n2s(p,rr->length);
 305 #if 0
 306 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
 307 #endif
 308
 309                 /* Lets check version */
 310                 if (!s->first_packet)
 311                         {
 312                         if (version != s->version)
 313                                 {
 314                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 315                                 /* Send back error using their
 316                                  * version number :-) */
 317                                 s->version=version;
 318                                 al=SSL_AD_PROTOCOL_VERSION;
 319                                 goto f_err;
 320                                 }
 321                         }
 322
 323                 if ((version>>8) != SSL3_VERSION_MAJOR)
 324                         {
 325                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 326                         goto err;
 327                         }
 328
 329                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
 330                         {
 331                         al=SSL_AD_RECORD_OVERFLOW;
 332                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 333                         goto f_err;
 334                         }
 335
 336                 /* now s->rstate == SSL_ST_READ_BODY */
 337                 }
 338
 339         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 340
 341         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 342                 {
 343                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 344                 i=rr->length;
 345                 n=ssl3_read_n(s,i,i,1);
 346                 if (n <= 0) return(n); /* error or non-blocking io */
 347                 /* now n == rr->length,
 348                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 349                 }
 350
 351         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 352
 353         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 354          * and we have that many bytes in s->packet
 355          */
 356         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 357
 358         /* ok, we can now read from 's->packet' data into 'rr'
 359          * rr->input points at rr->length bytes, which
 360          * need to be copied into rr->data by either
 361          * the decryption or by the decompression
 362          * When the data is 'copied' into the rr->data buffer,
 363          * rr->input will be pointed at the new buffer */
 364
 365         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 366          * rr->length bytes of encrypted compressed stuff. */
 367
 368         /* check is not needed I believe */
 369         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 370                 {
 371                 al=SSL_AD_RECORD_OVERFLOW;
 372                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 373                 goto f_err;
 374                 }
 375
 376         /* decrypt in place in 'rr->input' */
 377         rr->data=rr->input;
 378
 379         enc_err = s->method->ssl3_enc->enc(s,0);
 380         if (enc_err <= 0)
 381                 {
 382                 if (enc_err == 0)
 383                         /* SSLerr() and ssl3_send_alert() have been called */
 384                         goto err;
 385
 386                 /* Otherwise enc_err == -1, which indicates bad padding
 387                  * (rec->length has not been changed in this case).
 388                  * To minimize information leaked via timing, we will perform
 389                  * the MAC computation anyway. */
 390                 decryption_failed_or_bad_record_mac = 1;
 391                 }
 392
 393 #ifdef TLS_DEBUG
 394 printf("dec %d\n",rr->length);
 395 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 396 printf("\n");
 397 #endif
 398
 399         /* r->length is now the compressed data plus mac */
 400         if (    (sess == NULL) ||
 401                 (s->enc_read_ctx == NULL) ||
 402                 (s->read_hash == NULL))
 403                 clear=1;
 404
 405         if (!clear)
 406                 {
 407                 mac_size=EVP_MD_size(s->read_hash);
 408
 409                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 410                         {
 411 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 412                         al=SSL_AD_RECORD_OVERFLOW;
 413                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 414                         goto f_err;
 415 #else
 416                         decryption_failed_or_bad_record_mac = 1;
 417 #endif
 418                         }
 419                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 420                 if (rr->length >= mac_size)
 421                         {
 422                         rr->length -= mac_size;
 423                         mac = &rr->data[rr->length];
 424                         }
 425                 else
 426                         {
 427                         /* record (minus padding) is too short to contain a MAC */
 428 #if 0 /* OK only for stream ciphers */
 429                         al=SSL_AD_DECODE_ERROR;
 430                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 431                         goto f_err;
 432 #else
 433                         decryption_failed_or_bad_record_mac = 1;
 434                         rr->length = 0;
 435 #endif
 436                         }
 437                 i=s->method->ssl3_enc->mac(s,md,0);
 438                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 439                         {
 440                         decryption_failed_or_bad_record_mac = 1;
 441                         }
 442                 }
 443
 444         if (decryption_failed_or_bad_record_mac)
 445                 {
 446                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 447                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 448                  * failure is directly visible from the ciphertext anyway,
 449                  * we should not reveal which kind of error occured -- this
 450                  * might become visible to an attacker (e.g. via a logfile) */
 451                 al=SSL_AD_BAD_RECORD_MAC;
 452                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 453                 goto f_err;
 454                 }
 455
 456         /* r->length is now just compressed */
 457         if (s->expand != NULL)
 458                 {
 459                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 460                         {
 461                         al=SSL_AD_RECORD_OVERFLOW;
 462                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 463                         goto f_err;
 464                         }
 465                 if (!ssl3_do_uncompress(s))
 466                         {
 467                         al=SSL_AD_DECOMPRESSION_FAILURE;
 468                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 469                         goto f_err;
 470                         }
 471                 }
 472
 473         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 474                 {
 475                 al=SSL_AD_RECORD_OVERFLOW;
 476                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 477                 goto f_err;
 478                 }
 479
 480         rr->off=0;
 481         /* So at this point the following is true
 482          * ssl->s3->rrec.type   is the type of record
 483          * ssl->s3->rrec.length == number of bytes in record
 484          * ssl->s3->rrec.off    == offset to first valid byte
 485          * ssl->s3->rrec.data   == where to take bytes from, increment
 486          *                         after use :-).
 487          */
 488
 489         /* we have pulled in a full packet so zero things */
 490         s->packet_length=0;
 491
 492         /* just read a 0 length packet */
 493         if (rr->length == 0) goto again;
 494
 495 #if 0
 496 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
 497 #endif
 498
 499         return(1);
 500
 501 f_err:
 502         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 503 err:
 504         return(ret);
 505         }
 506
 507 int ssl3_do_uncompress(SSL *ssl)
 508         {
 509 #ifndef OPENSSL_NO_COMP
 510         int i;
 511         SSL3_RECORD *rr;
 512
 513         rr= &(ssl->s3->rrec);
 514         i=COMP_expand_block(ssl->expand,rr->comp,
 515                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 516         if (i < 0)
 517                 return(0);
 518         else
 519                 rr->length=i;
 520         rr->data=rr->comp;
 521 #endif
 522         return(1);
 523         }
 524
 525 int ssl3_do_compress(SSL *ssl)
 526         {
 527 #ifndef OPENSSL_NO_COMP
 528         int i;
 529         SSL3_RECORD *wr;
 530
 531         wr= &(ssl->s3->wrec);
 532         i=COMP_compress_block(ssl->compress,wr->data,
 533                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 534                 wr->input,(int)wr->length);
 535         if (i < 0)
 536                 return(0);
 537         else
 538                 wr->length=i;
 539
 540         wr->input=wr->data;
 541 #endif
 542         return(1);
 543         }
 544
 545 /* Call this to write data in records of type 'type'
 546  * It will return <= 0 if not all data has been sent or non-blocking IO.
 547  */
 548 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 549         {
 550         const unsigned char *buf=buf_;
 551         unsigned int tot,n,nw;
 552         int i;
 553
 554         s->rwstate=SSL_NOTHING;
 555         tot=s->s3->wnum;
 556         s->s3->wnum=0;
 557
 558         if (SSL_in_init(s) && !s->in_handshake)
 559                 {
 560                 i=s->handshake_func(s);
 561                 if (i < 0) return(i);
 562                 if (i == 0)
 563                         {
 564                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 565                         return -1;
 566                         }
 567                 }
 568
 569         n=(len-tot);
 570         for (;;)
 571                 {
 572                 if (n > s->max_send_fragment)
 573                         nw=s->max_send_fragment;
 574                 else
 575                         nw=n;
 576
 577                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 578                 if (i <= 0)
 579                         {
 580                         s->s3->wnum=tot;
 581                         return i;
 582                         }
 583
 584                 if ((i == (int)n) ||
 585                         (type == SSL3_RT_APPLICATION_DATA &&
 586                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 587                         {
 588                         /* next chunk of data should get another prepended empty fragment
 589                          * in ciphersuites with known-IV weakness: */
 590                         s->s3->empty_fragment_done = 0;
 591
 592                         return tot+i;
 593                         }
 594
 595                 n-=i;
 596                 tot+=i;
 597                 }
 598         }
 599
 600 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 601                          unsigned int len, int create_empty_fragment)
 602         {
 603         unsigned char *p,*plen;
 604         int i,mac_size,clear=0;
 605         int prefix_len=0,align=0;
 606         SSL3_RECORD *wr;
 607         SSL3_BUFFER *wb=&(s->s3->wbuf);
 608         SSL_SESSION *sess;
 609
 610         /* first check if there is a SSL3_BUFFER still being written
 611          * out.  This will happen with non blocking IO */
 612         if (wb->left != 0)
 613                 return(ssl3_write_pending(s,type,buf,len));
 614
 615         /* If we have an alert to send, lets send it */
 616         if (s->s3->alert_dispatch)
 617                 {
 618                 i=s->method->ssl_dispatch_alert(s);
 619                 if (i <= 0)
 620                         return(i);
 621                 /* if it went, fall through and send more stuff */
 622                 }
 623
 624         if (len == 0 && !create_empty_fragment)
 625                 return 0;
 626
 627         wr= &(s->s3->wrec);
 628         sess=s->session;
 629
 630         if (    (sess == NULL) ||
 631                 (s->enc_write_ctx == NULL) ||
 632                 (s->write_hash == NULL))
 633                 clear=1;
 634
 635         if (clear)
 636                 mac_size=0;
 637         else
 638                 mac_size=EVP_MD_size(s->write_hash);
 639
 640         /* 'create_empty_fragment' is true only when this function calls itself */
 641         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 642                 {
 643                 /* countermeasure against known-IV weakness in CBC ciphersuites
 644                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 645
 646                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 647                         {
 648                         /* recursive function call with 'create_empty_fragment' set;
 649                          * this prepares and buffers the data for an empty fragment
 650                          * (these 'prefix_len' bytes are sent out later
 651                          * together with the actual payload) */
 652                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 653                         if (prefix_len <= 0)
 654                                 goto err;
 655
 656                         if (prefix_len >
 657                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
 658                                 {
 659                                 /* insufficient space */
 660                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 661                                 goto err;
 662                                 }
 663                         }
 664
 665                 s->s3->empty_fragment_done = 1;
 666                 }
 667
 668         if (create_empty_fragment)
 669                 {
 670 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 671                 /* extra fragment would be couple of cipher blocks,
 672                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
 673                  * if we want to align the real payload, then we can
 674                  * just pretent we simply have two headers. */
 675                 align = (int)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
 676                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 677 #endif
 678                 p = wb->buf + align;
 679                 wb->offset  = align;
 680                 }
 681         else if (prefix_len)
 682                 {
 683                 p = wb->buf + wb->offset + prefix_len;
 684                 }
 685         else
 686                 {
 687 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 688                 align = (int)wb->buf + SSL3_RT_HEADER_LENGTH;
 689                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 690 #endif
 691                 p = wb->buf + align;
 692                 wb->offset  = align;
 693                 }
 694
 695         /* write the header */
 696
 697         *(p++)=type&0xff;
 698         wr->type=type;
 699
 700         *(p++)=(s->version>>8);
 701         *(p++)=s->version&0xff;
 702
 703         /* field where we are to write out packet length */
 704         plen=p;
 705         p+=2;
 706
 707         /* lets setup the record stuff. */
 708         wr->data=p;
 709         wr->length=(int)len;
 710         wr->input=(unsigned char *)buf;
 711
 712         /* we now 'read' from wr->input, wr->length bytes into
 713          * wr->data */
 714
 715         /* first we compress */
 716         if (s->compress != NULL)
 717                 {
 718                 if (!ssl3_do_compress(s))
 719                         {
 720                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 721                         goto err;
 722                         }
 723                 }
 724         else
 725                 {
 726                 memcpy(wr->data,wr->input,wr->length);
 727                 wr->input=wr->data;
 728                 }
 729
 730         /* we should still have the output to wr->data and the input
 731          * from wr->input.  Length should be wr->length.
 732          * wr->data still points in the wb->buf */
 733
 734         if (mac_size != 0)
 735                 {
 736                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 737                 wr->length+=mac_size;
 738                 wr->input=p;
 739                 wr->data=p;
 740                 }
 741
 742         /* ssl3_enc can only have an error on read */
 743         s->method->ssl3_enc->enc(s,1);
 744
 745         /* record length after mac and block padding */
 746         s2n(wr->length,plen);
 747
 748         /* we should now have
 749          * wr->data pointing to the encrypted data, which is
 750          * wr->length long */
 751         wr->type=type; /* not needed but helps for debugging */
 752         wr->length+=SSL3_RT_HEADER_LENGTH;
 753
 754         if (create_empty_fragment)
 755                 {
 756                 /* we are in a recursive call;
 757                  * just return the length, don't write out anything here
 758                  */
 759                 return wr->length;
 760                 }
 761
 762         /* now let's set up wb */
 763         wb->left = prefix_len + wr->length;
 764
 765         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 766         s->s3->wpend_tot=len;
 767         s->s3->wpend_buf=buf;
 768         s->s3->wpend_type=type;
 769         s->s3->wpend_ret=len;
 770
 771         /* we now just need to write the buffer */
 772         return ssl3_write_pending(s,type,buf,len);
 773 err:
 774         return -1;
 775         }
 776
 777 /* if s->s3->wbuf.left != 0, we need to call this */
 778 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 779         unsigned int len)
 780         {
 781         int i;
 782         SSL3_BUFFER *wb=&(s->s3->wbuf);
 783
 784 /* XXXX */
 785         if ((s->s3->wpend_tot > (int)len)
 786                 || ((s->s3->wpend_buf != buf) &&
 787                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 788                 || (s->s3->wpend_type != type))
 789                 {
 790                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 791                 return(-1);
 792                 }
 793
 794         for (;;)
 795                 {
 796                 clear_sys_error();
 797                 if (s->wbio != NULL)
 798                         {
 799                         s->rwstate=SSL_WRITING;
 800                         i=BIO_write(s->wbio,
 801                                 (char *)&(wb->buf[wb->offset]),
 802                                 (unsigned int)wb->left);
 803                         }
 804                 else
 805                         {
 806                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 807                         i= -1;
 808                         }
 809                 if (i == wb->left)
 810                         {
 811                         wb->left=0;
 812                         wb->offset+=i;
 813                         s->rwstate=SSL_NOTHING;
 814                         return(s->s3->wpend_ret);
 815                         }
 816                 else if (i <= 0)
 817                         return(i);
 818                 wb->offset+=i;
 819                 wb->left-=i;
 820                 }
 821         }
 822
 823 /* Return up to 'len' payload bytes received in 'type' records.
 824  * 'type' is one of the following:
 825  *
 826  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 827  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 828  *   -  0 (during a shutdown, no data has to be returned)
 829  *
 830  * If we don't have stored data to work from, read a SSL/TLS record first
 831  * (possibly multiple records if we still don't have anything to return).
 832  *
 833  * This function must handle any surprises the peer may have for us, such as
 834  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 835  * a surprise, but handled as if it were), or renegotiation requests.
 836  * Also if record payloads contain fragments too small to process, we store
 837  * them until there is enough for the respective protocol (the record protocol
 838  * may use arbitrary fragmentation and even interleaving):
 839  *     Change cipher spec protocol
 840  *             just 1 byte needed, no need for keeping anything stored
 841  *     Alert protocol
 842  *             2 bytes needed (AlertLevel, AlertDescription)
 843  *     Handshake protocol
 844  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 845  *             to detect unexpected Client Hello and Hello Request messages
 846  *             here, anything else is handled by higher layers
 847  *     Application data protocol
 848  *             none of our business
 849  */
 850 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 851         {
 852         int al,i,j,ret;
 853         unsigned int n;
 854         SSL3_RECORD *rr;
 855         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 856
 857         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 858                 if (!ssl3_setup_buffers(s))
 859                         return(-1);
 860
 861         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 862             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 863                 {
 864                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 865                 return -1;
 866                 }
 867
 868         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 869                 /* (partially) satisfy request from storage */
 870                 {
 871                 unsigned char *src = s->s3->handshake_fragment;
 872                 unsigned char *dst = buf;
 873                 unsigned int k;
 874
 875                 /* peek == 0 */
 876                 n = 0;
 877                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 878                         {
 879                         *dst++ = *src++;
 880                         len--; s->s3->handshake_fragment_len--;
 881                         n++;
 882                         }
 883                 /* move any remaining fragment bytes: */
 884                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 885                         s->s3->handshake_fragment[k] = *src++;
 886                 return n;
 887         }
 888
 889         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 890
 891         if (!s->in_handshake && SSL_in_init(s))
 892                 {
 893                 /* type == SSL3_RT_APPLICATION_DATA */
 894                 i=s->handshake_func(s);
 895                 if (i < 0) return(i);
 896                 if (i == 0)
 897                         {
 898                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 899                         return(-1);
 900                         }
 901                 }
 902 start:
 903         s->rwstate=SSL_NOTHING;
 904
 905         /* s->s3->rrec.type         - is the type of record
 906          * s->s3->rrec.data,    - data
 907          * s->s3->rrec.off,     - offset into 'data' for next read
 908          * s->s3->rrec.length,  - number of bytes. */
 909         rr = &(s->s3->rrec);
 910
 911         /* get new packet if necessary */
 912         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 913                 {
 914                 ret=ssl3_get_record(s);
 915                 if (ret <= 0) return(ret);
 916                 }
 917
 918         /* we now have a packet which can be read and processed */
 919
 920         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 921                                        * reset by ssl3_get_finished */
 922                 && (rr->type != SSL3_RT_HANDSHAKE))
 923                 {
 924                 al=SSL_AD_UNEXPECTED_MESSAGE;
 925                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 926                 goto f_err;
 927                 }
 928
 929         /* If the other end has shut down, throw anything we read away
 930          * (even in 'peek' mode) */
 931         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 932                 {
 933                 rr->length=0;
 934                 s->rwstate=SSL_NOTHING;
 935                 return(0);
 936                 }
 937
 938
 939         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 940                 {
 941                 /* make sure that we are not getting application data when we
 942                  * are doing a handshake for the first time */
 943                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 944                         (s->enc_read_ctx == NULL))
 945                         {
 946                         al=SSL_AD_UNEXPECTED_MESSAGE;
 947                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 948                         goto f_err;
 949                         }
 950
 951                 if (len <= 0) return(len);
 952
 953                 if ((unsigned int)len > rr->length)
 954                         n = rr->length;
 955                 else
 956                         n = (unsigned int)len;
 957
 958                 memcpy(buf,&(rr->data[rr->off]),n);
 959                 if (!peek)
 960                         {
 961                         rr->length-=n;
 962                         rr->off+=n;
 963                         if (rr->length == 0)
 964                                 {
 965                                 s->rstate=SSL_ST_READ_HEADER;
 966                                 rr->off=0;
 967                                 }
 968                         }
 969                 return(n);
 970                 }
 971
 972
 973         /* If we get here, then type != rr->type; if we have a handshake
 974          * message, then it was unexpected (Hello Request or Client Hello). */
 975
 976         /* In case of record types for which we have 'fragment' storage,
 977          * fill that so that we can process the data at a fixed place.
 978          */
 979                 {
 980                 unsigned int dest_maxlen = 0;
 981                 unsigned char *dest = NULL;
 982                 unsigned int *dest_len = NULL;
 983
 984                 if (rr->type == SSL3_RT_HANDSHAKE)
 985                         {
 986                         dest_maxlen = sizeof s->s3->handshake_fragment;
 987                         dest = s->s3->handshake_fragment;
 988                         dest_len = &s->s3->handshake_fragment_len;
 989                         }
 990                 else if (rr->type == SSL3_RT_ALERT)
 991                         {
 992                         dest_maxlen = sizeof s->s3->alert_fragment;
 993                         dest = s->s3->alert_fragment;
 994                         dest_len = &s->s3->alert_fragment_len;
 995                         }
 996
 997                 if (dest_maxlen > 0)
 998                         {
 999                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1000                         if (rr->length < n)
1001                                 n = rr->length; /* available bytes */
1002
1003                         /* now move 'n' bytes: */
1004                         while (n-- > 0)
1005                                 {
1006                                 dest[(*dest_len)++] = rr->data[rr->off++];
1007                                 rr->length--;
1008                                 }
1009
1010                         if (*dest_len < dest_maxlen)
1011                                 goto start; /* fragment was too small */
1012                         }
1013                 }
1014
1015         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1016          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1017          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1018
1019         /* If we are a client, check for an incoming 'Hello Request': */
1020         if ((!s->server) &&
1021                 (s->s3->handshake_fragment_len >= 4) &&
1022                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1023                 (s->session != NULL) && (s->session->cipher != NULL))
1024                 {
1025                 s->s3->handshake_fragment_len = 0;
1026
1027                 if ((s->s3->handshake_fragment[1] != 0) ||
1028                         (s->s3->handshake_fragment[2] != 0) ||
1029                         (s->s3->handshake_fragment[3] != 0))
1030                         {
1031                         al=SSL_AD_DECODE_ERROR;
1032                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1033                         goto f_err;
1034                         }
1035
1036                 if (s->msg_callback)
1037                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1038
1039                 if (SSL_is_init_finished(s) &&
1040                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1041                         !s->s3->renegotiate)
1042                         {
1043                         ssl3_renegotiate(s);
1044                         if (ssl3_renegotiate_check(s))
1045                                 {
1046                                 i=s->handshake_func(s);
1047                                 if (i < 0) return(i);
1048                                 if (i == 0)
1049                                         {
1050                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1051                                         return(-1);
1052                                         }
1053
1054                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1055                                         {
1056                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1057                                                 {
1058                                                 BIO *bio;
1059                                                 /* In the case where we try to read application data,
1060                                                  * but we trigger an SSL handshake, we return -1 with
1061                                                  * the retry option set.  Otherwise renegotiation may
1062                                                  * cause nasty problems in the blocking world */
1063                                                 s->rwstate=SSL_READING;
1064                                                 bio=SSL_get_rbio(s);
1065                                                 BIO_clear_retry_flags(bio);
1066                                                 BIO_set_retry_read(bio);
1067                                                 return(-1);
1068                                                 }
1069                                         }
1070                                 }
1071                         }
1072                 /* we either finished a handshake or ignored the request,
1073                  * now try again to obtain the (application) data we were asked for */
1074                 goto start;
1075                 }
1076
1077         if (s->s3->alert_fragment_len >= 2)
1078                 {
1079                 int alert_level = s->s3->alert_fragment[0];
1080                 int alert_descr = s->s3->alert_fragment[1];
1081
1082                 s->s3->alert_fragment_len = 0;
1083
1084                 if (s->msg_callback)
1085                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1086
1087                 if (s->info_callback != NULL)
1088                         cb=s->info_callback;
1089                 else if (s->ctx->info_callback != NULL)
1090                         cb=s->ctx->info_callback;
1091
1092                 if (cb != NULL)
1093                         {
1094                         j = (alert_level << 8) | alert_descr;
1095                         cb(s, SSL_CB_READ_ALERT, j);
1096                         }
1097
1098                 if (alert_level == 1) /* warning */
1099                         {
1100                         s->s3->warn_alert = alert_descr;
1101                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1102                                 {
1103                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1104                                 return(0);
1105                                 }
1106                         }
1107                 else if (alert_level == 2) /* fatal */
1108                         {
1109                         char tmp[16];
1110
1111                         s->rwstate=SSL_NOTHING;
1112                         s->s3->fatal_alert = alert_descr;
1113                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1114                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1115                         ERR_add_error_data(2,"SSL alert number ",tmp);
1116                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1117                         SSL_CTX_remove_session(s->ctx,s->session);
1118                         return(0);
1119                         }
1120                 else
1121                         {
1122                         al=SSL_AD_ILLEGAL_PARAMETER;
1123                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1124                         goto f_err;
1125                         }
1126
1127                 goto start;
1128                 }
1129
1130         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1131                 {
1132                 s->rwstate=SSL_NOTHING;
1133                 rr->length=0;
1134                 return(0);
1135                 }
1136
1137         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1138                 {
1139                 /* 'Change Cipher Spec' is just a single byte, so we know
1140                  * exactly what the record payload has to look like */
1141                 if (    (rr->length != 1) || (rr->off != 0) ||
1142                         (rr->data[0] != SSL3_MT_CCS))
1143                         {
1144                         al=SSL_AD_ILLEGAL_PARAMETER;
1145                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1146                         goto f_err;
1147                         }
1148
1149                 /* Check we have a cipher to change to */
1150                 if (s->s3->tmp.new_cipher == NULL)
1151                         {
1152                         al=SSL_AD_UNEXPECTED_MESSAGE;
1153                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1154                         goto f_err;
1155                         }
1156
1157                 rr->length=0;
1158
1159                 if (s->msg_callback)
1160                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1161
1162                 s->s3->change_cipher_spec=1;
1163                 if (!ssl3_do_change_cipher_spec(s))
1164                         goto err;
1165                 else
1166                         goto start;
1167                 }
1168
1169         /* Unexpected handshake message (Client Hello, or protocol violation) */
1170         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1171                 {
1172                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1173                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1174                         {
1175 #if 0 /* worked only because C operator preferences are not as expected (and
1176        * because this is not really needed for clients except for detecting
1177        * protocol violations): */
1178                         s->state=SSL_ST_BEFORE|(s->server)
1179                                 ?SSL_ST_ACCEPT
1180                                 :SSL_ST_CONNECT;
1181 #else
1182                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1183 #endif
1184                         s->new_session=1;
1185                         }
1186                 i=s->handshake_func(s);
1187                 if (i < 0) return(i);
1188                 if (i == 0)
1189                         {
1190                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1191                         return(-1);
1192                         }
1193
1194                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1195                         {
1196                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1197                                 {
1198                                 BIO *bio;
1199                                 /* In the case where we try to read application data,
1200                                  * but we trigger an SSL handshake, we return -1 with
1201                                  * the retry option set.  Otherwise renegotiation may
1202                                  * cause nasty problems in the blocking world */
1203                                 s->rwstate=SSL_READING;
1204                                 bio=SSL_get_rbio(s);
1205                                 BIO_clear_retry_flags(bio);
1206                                 BIO_set_retry_read(bio);
1207                                 return(-1);
1208                                 }
1209                         }
1210                 goto start;
1211                 }
1212
1213         switch (rr->type)
1214                 {
1215         default:
1216 #ifndef OPENSSL_NO_TLS
1217                 /* TLS just ignores unknown message types */
1218                 if (s->version == TLS1_VERSION)
1219                         {
1220                         rr->length = 0;
1221                         goto start;
1222                         }
1223 #endif
1224                 al=SSL_AD_UNEXPECTED_MESSAGE;
1225                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1226                 goto f_err;
1227         case SSL3_RT_CHANGE_CIPHER_SPEC:
1228         case SSL3_RT_ALERT:
1229         case SSL3_RT_HANDSHAKE:
1230                 /* we already handled all of these, with the possible exception
1231                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1232                  * should not happen when type != rr->type */
1233                 al=SSL_AD_UNEXPECTED_MESSAGE;
1234                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1235                 goto f_err;
1236         case SSL3_RT_APPLICATION_DATA:
1237                 /* At this point, we were expecting handshake data,
1238                  * but have application data.  If the library was
1239                  * running inside ssl3_read() (i.e. in_read_app_data
1240                  * is set) and it makes sense to read application data
1241                  * at this point (session renegotiation not yet started),
1242                  * we will indulge it.
1243                  */
1244                 if (s->s3->in_read_app_data &&
1245                         (s->s3->total_renegotiations != 0) &&
1246                         ((
1247                                 (s->state & SSL_ST_CONNECT) &&
1248                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1249                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1250                                 ) || (
1251                                         (s->state & SSL_ST_ACCEPT) &&
1252                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1253                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1254                                         )
1255                                 ))
1256                         {
1257                         s->s3->in_read_app_data=2;
1258                         return(-1);
1259                         }
1260                 else
1261                         {
1262                         al=SSL_AD_UNEXPECTED_MESSAGE;
1263                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1264                         goto f_err;
1265                         }
1266                 }
1267         /* not reached */
1268
1269 f_err:
1270         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1271 err:
1272         return(-1);
1273         }
1274
1275 int ssl3_do_change_cipher_spec(SSL *s)
1276         {
1277         int i;
1278         const char *sender;
1279         int slen;
1280
1281         if (s->state & SSL_ST_ACCEPT)
1282                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1283         else
1284                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1285
1286         if (s->s3->tmp.key_block == NULL)
1287                 {
1288                 s->session->cipher=s->s3->tmp.new_cipher;
1289                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1290                 }
1291
1292         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1293                 return(0);
1294
1295         /* we have to record the message digest at
1296          * this point so we can get it before we read
1297          * the finished message */
1298         if (s->state & SSL_ST_CONNECT)
1299                 {
1300                 sender=s->method->ssl3_enc->server_finished_label;
1301                 slen=s->method->ssl3_enc->server_finished_label_len;
1302                 }
1303         else
1304                 {
1305                 sender=s->method->ssl3_enc->client_finished_label;
1306                 slen=s->method->ssl3_enc->client_finished_label_len;
1307                 }
1308
1309         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1310                 &(s->s3->finish_dgst1),
1311                 &(s->s3->finish_dgst2),
1312                 sender,slen,s->s3->tmp.peer_finish_md);
1313
1314         return(1);
1315         }
1316
1317 void ssl3_send_alert(SSL *s, int level, int desc)
1318         {
1319         /* Map tls/ssl alert value to correct one */
1320         desc=s->method->ssl3_enc->alert_value(desc);
1321         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1322                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1323         if (desc < 0) return;
1324         /* If a fatal one, remove from cache */
1325         if ((level == 2) && (s->session != NULL))
1326                 SSL_CTX_remove_session(s->ctx,s->session);
1327
1328         s->s3->alert_dispatch=1;
1329         s->s3->send_alert[0]=level;
1330         s->s3->send_alert[1]=desc;
1331         if (s->s3->wbuf.left == 0) /* data still being written out? */
1332                 s->method->ssl_dispatch_alert(s);
1333         /* else data is still being written out, we will get written
1334          * some time in the future */
1335         }
1336
1337 int ssl3_dispatch_alert(SSL *s)
1338         {
1339         int i,j;
1340         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1341
1342         s->s3->alert_dispatch=0;
1343         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1344         if (i <= 0)
1345                 {
1346                 s->s3->alert_dispatch=1;
1347                 }
1348         else
1349                 {
1350                 /* Alert sent to BIO.  If it is important, flush it now.
1351                  * If the message does not get sent due to non-blocking IO,
1352                  * we will not worry too much. */
1353                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1354                         (void)BIO_flush(s->wbio);
1355
1356                 if (s->msg_callback)
1357                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1358
1359                 if (s->info_callback != NULL)
1360                         cb=s->info_callback;
1361                 else if (s->ctx->info_callback != NULL)
1362                         cb=s->ctx->info_callback;
1363
1364                 if (cb != NULL)
1365                         {
1366                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1367                         cb(s,SSL_CB_WRITE_ALERT,j);
1368                         }
1369                 }
1370         return(i);
1371         }