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;
 133         long align=0;
 134         unsigned char *pkt;
 135         SSL3_BUFFER *rb;
 136
 137         if (n <= 0) return n;
 138
 139         rb    = &(s->s3->rbuf);
 140         if (rb->buf == NULL)
 141                 if (!ssl3_setup_read_buffer(s))
 142                         return -1;
 143
 144         left  = rb->left;
 145 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 146         align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
 147         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 148 #endif
 149
 150         if (!extend)
 151                 {
 152                 /* start with empty packet ... */
 153                 if (left == 0)
 154                         rb->offset = align;
 155                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
 156                         {
 157                         /* check if next packet length is large
 158                          * enough to justify payload alignment... */
 159                         pkt = rb->buf + rb->offset;
 160                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
 161                             && (pkt[3]<<8|pkt[4]) >= 128)
 162                                 {
 163                                 /* Note that even if packet is corrupted
 164                                  * and its length field is insane, we can
 165                                  * only be led to wrong decision about
 166                                  * whether memmove will occur or not.
 167                                  * Header values has no effect on memmove
 168                                  * arguments and therefore no buffer
 169                                  * overrun can be triggered. */
 170                                 memmove (rb->buf+align,pkt,left);
 171                                 rb->offset = align;
 172                                 }
 173                         }
 174                 s->packet = rb->buf + rb->offset;
 175                 s->packet_length = 0;
 176                 /* ... now we can act as if 'extend' was set */
 177                 }
 178
 179         /* For DTLS/UDP reads should not span multiple packets
 180          * because the read operation returns the whole packet
 181          * at once (as long as it fits into the buffer). */
 182         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 183                 {
 184                 if (left > 0 && n > left)
 185                         n = left;
 186                 }
 187
 188         /* if there is enough in the buffer from a previous read, take some */
 189         if (left >= n)
 190                 {
 191                 s->packet_length+=n;
 192                 rb->left=left-n;
 193                 rb->offset+=n;
 194                 return(n);
 195                 }
 196
 197         /* else we need to read more data */
 198
 199         len = s->packet_length;
 200         pkt = rb->buf+align;
 201         /* Move any available bytes to front of buffer:
 202          * 'len' bytes already pointed to by 'packet',
 203          * 'left' extra ones at the end */
 204         if (s->packet != pkt) /* len > 0 */
 205                 {
 206                 memmove(pkt, s->packet, len+left);
 207                 s->packet = pkt;
 208                 rb->offset = len + align;
 209                 }
 210
 211         if (n > (int)(rb->len - rb->offset)) /* does not happen */
 212                 {
 213                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 214                 return -1;
 215                 }
 216
 217         if (!s->read_ahead)
 218                 /* ignore max parameter */
 219                 max = n;
 220         else
 221                 {
 222                 if (max < n)
 223                         max = n;
 224                 if (max > (int)(rb->len - rb->offset))
 225                         max = rb->len - rb->offset;
 226                 }
 227
 228         while (left < n)
 229                 {
 230                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
 231                  * and need to read in more until we have len+n (up to
 232                  * len+max if possible) */
 233
 234                 clear_sys_error();
 235                 if (s->rbio != NULL)
 236                         {
 237                         s->rwstate=SSL_READING;
 238                         i=BIO_read(s->rbio,pkt+len+left, max-left);
 239                         }
 240                 else
 241                         {
 242                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 243                         i = -1;
 244                         }
 245
 246                 if (i <= 0)
 247                         {
 248                         rb->left = left;
 249                         if (s->mode & SSL_MODE_RELEASE_BUFFERS)
 250                                 if (len+left == 0)
 251                                         ssl3_release_read_buffer(s);
 252                         return(i);
 253                         }
 254                 left+=i;
 255                 /* reads should *never* span multiple packets for DTLS because
 256                  * the underlying transport protocol is message oriented as opposed
 257                  * to byte oriented as in the TLS case. */
 258                 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 259                         {
 260                         if (n > left)
 261                                 n = left; /* makes the while condition false */
 262                         }
 263                 }
 264
 265         /* done reading, now the book-keeping */
 266         rb->offset += n;
 267         rb->left = left - n;
 268         s->packet_length += n;
 269         s->rwstate=SSL_NOTHING;
 270         return(n);
 271         }
 272
 273 /* Call this to get a new input record.
 274  * It will return <= 0 if more data is needed, normally due to an error
 275  * or non-blocking IO.
 276  * When it finishes, one packet has been decoded and can be found in
 277  * ssl->s3->rrec.type    - is the type of record
 278  * ssl->s3->rrec.data,   - data
 279  * ssl->s3->rrec.length, - number of bytes
 280  */
 281 /* used only by ssl3_read_bytes */
 282 static int ssl3_get_record(SSL *s)
 283         {
 284         int ssl_major,ssl_minor,al;
 285         int enc_err,n,i,ret= -1;
 286         SSL3_RECORD *rr;
 287         SSL_SESSION *sess;
 288         unsigned char *p;
 289         unsigned char md[EVP_MAX_MD_SIZE];
 290         short version;
 291         int mac_size;
 292         int clear=0;
 293         size_t extra;
 294         int decryption_failed_or_bad_record_mac = 0;
 295         unsigned char *mac = NULL;
 296
 297         rr= &(s->s3->rrec);
 298         sess=s->session;
 299
 300         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 301                 extra=SSL3_RT_MAX_EXTRA;
 302         else
 303                 extra=0;
 304         if (extra && !s->s3->init_extra)
 305                 {
 306                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 307                  * set after ssl3_setup_buffers() was done */
 308                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 309                 return -1;
 310                 }
 311
 312 again:
 313         /* check if we have the header */
 314         if (    (s->rstate != SSL_ST_READ_BODY) ||
 315                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 316                 {
 317                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 318                 if (n <= 0) return(n); /* error or non-blocking */
 319                 s->rstate=SSL_ST_READ_BODY;
 320
 321                 p=s->packet;
 322
 323                 /* Pull apart the header into the SSL3_RECORD */
 324                 rr->type= *(p++);
 325                 ssl_major= *(p++);
 326                 ssl_minor= *(p++);
 327                 version=(ssl_major<<8)|ssl_minor;
 328                 n2s(p,rr->length);
 329 #if 0
 330 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
 331 #endif
 332
 333                 /* Lets check version */
 334                 if (!s->first_packet)
 335                         {
 336                         if (version != s->version)
 337                                 {
 338                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 339                                 /* Send back error using their
 340                                  * version number :-) */
 341                                 s->version=version;
 342                                 al=SSL_AD_PROTOCOL_VERSION;
 343                                 goto f_err;
 344                                 }
 345                         }
 346
 347                 if ((version>>8) != SSL3_VERSION_MAJOR)
 348                         {
 349                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 350                         goto err;
 351                         }
 352
 353                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
 354                         {
 355                         al=SSL_AD_RECORD_OVERFLOW;
 356                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 357                         goto f_err;
 358                         }
 359
 360                 /* now s->rstate == SSL_ST_READ_BODY */
 361                 }
 362
 363         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 364
 365         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 366                 {
 367                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 368                 i=rr->length;
 369                 n=ssl3_read_n(s,i,i,1);
 370                 if (n <= 0) return(n); /* error or non-blocking io */
 371                 /* now n == rr->length,
 372                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 373                 }
 374
 375         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 376
 377         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 378          * and we have that many bytes in s->packet
 379          */
 380         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 381
 382         /* ok, we can now read from 's->packet' data into 'rr'
 383          * rr->input points at rr->length bytes, which
 384          * need to be copied into rr->data by either
 385          * the decryption or by the decompression
 386          * When the data is 'copied' into the rr->data buffer,
 387          * rr->input will be pointed at the new buffer */
 388
 389         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 390          * rr->length bytes of encrypted compressed stuff. */
 391
 392         /* check is not needed I believe */
 393         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 394                 {
 395                 al=SSL_AD_RECORD_OVERFLOW;
 396                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 397                 goto f_err;
 398                 }
 399
 400         /* decrypt in place in 'rr->input' */
 401         rr->data=rr->input;
 402
 403         enc_err = s->method->ssl3_enc->enc(s,0);
 404         if (enc_err <= 0)
 405                 {
 406                 if (enc_err == 0)
 407                         /* SSLerr() and ssl3_send_alert() have been called */
 408                         goto err;
 409
 410                 /* Otherwise enc_err == -1, which indicates bad padding
 411                  * (rec->length has not been changed in this case).
 412                  * To minimize information leaked via timing, we will perform
 413                  * the MAC computation anyway. */
 414                 decryption_failed_or_bad_record_mac = 1;
 415                 }
 416
 417 #ifdef TLS_DEBUG
 418 printf("dec %d\n",rr->length);
 419 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 420 printf("\n");
 421 #endif
 422
 423         /* r->length is now the compressed data plus mac */
 424         if (    (sess == NULL) ||
 425                 (s->enc_read_ctx == NULL) ||
 426                 (EVP_MD_CTX_md(s->read_hash) == NULL))
 427                 clear=1;
 428
 429         if (!clear)
 430                 {
 431                 /* !clear => s->read_hash != NULL => mac_size != -1 */
 432                 mac_size=EVP_MD_CTX_size(s->read_hash);
 433                 OPENSSL_assert(mac_size >= 0);
 434
 435                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 436                         {
 437 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 438                         al=SSL_AD_RECORD_OVERFLOW;
 439                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 440                         goto f_err;
 441 #else
 442                         decryption_failed_or_bad_record_mac = 1;
 443 #endif
 444                         }
 445                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 446                 if (rr->length >= (unsigned int)mac_size)
 447                         {
 448                         rr->length -= mac_size;
 449                         mac = &rr->data[rr->length];
 450                         }
 451                 else
 452                         {
 453                         /* record (minus padding) is too short to contain a MAC */
 454 #if 0 /* OK only for stream ciphers */
 455                         al=SSL_AD_DECODE_ERROR;
 456                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 457                         goto f_err;
 458 #else
 459                         decryption_failed_or_bad_record_mac = 1;
 460                         rr->length = 0;
 461 #endif
 462                         }
 463                 i=s->method->ssl3_enc->mac(s,md,0);
 464                 if (i < 0 || mac == NULL || memcmp(md, mac, (size_t)mac_size) != 0)
 465                         {
 466                         decryption_failed_or_bad_record_mac = 1;
 467                         }
 468                 }
 469
 470         if (decryption_failed_or_bad_record_mac)
 471                 {
 472                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 473                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 474                  * failure is directly visible from the ciphertext anyway,
 475                  * we should not reveal which kind of error occured -- this
 476                  * might become visible to an attacker (e.g. via a logfile) */
 477                 al=SSL_AD_BAD_RECORD_MAC;
 478                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 479                 goto f_err;
 480                 }
 481
 482         /* r->length is now just compressed */
 483         if (s->expand != NULL)
 484                 {
 485                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 486                         {
 487                         al=SSL_AD_RECORD_OVERFLOW;
 488                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 489                         goto f_err;
 490                         }
 491                 if (!ssl3_do_uncompress(s))
 492                         {
 493                         al=SSL_AD_DECOMPRESSION_FAILURE;
 494                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 495                         goto f_err;
 496                         }
 497                 }
 498
 499         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 500                 {
 501                 al=SSL_AD_RECORD_OVERFLOW;
 502                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 503                 goto f_err;
 504                 }
 505
 506         rr->off=0;
 507         /* So at this point the following is true
 508          * ssl->s3->rrec.type   is the type of record
 509          * ssl->s3->rrec.length == number of bytes in record
 510          * ssl->s3->rrec.off    == offset to first valid byte
 511          * ssl->s3->rrec.data   == where to take bytes from, increment
 512          *                         after use :-).
 513          */
 514
 515         /* we have pulled in a full packet so zero things */
 516         s->packet_length=0;
 517
 518         /* just read a 0 length packet */
 519         if (rr->length == 0) goto again;
 520
 521 #if 0
 522 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
 523 #endif
 524
 525         return(1);
 526
 527 f_err:
 528         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 529 err:
 530         return(ret);
 531         }
 532
 533 int ssl3_do_uncompress(SSL *ssl)
 534         {
 535 #ifndef OPENSSL_NO_COMP
 536         int i;
 537         SSL3_RECORD *rr;
 538
 539         rr= &(ssl->s3->rrec);
 540         i=COMP_expand_block(ssl->expand,rr->comp,
 541                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 542         if (i < 0)
 543                 return(0);
 544         else
 545                 rr->length=i;
 546         rr->data=rr->comp;
 547 #endif
 548         return(1);
 549         }
 550
 551 int ssl3_do_compress(SSL *ssl)
 552         {
 553 #ifndef OPENSSL_NO_COMP
 554         int i;
 555         SSL3_RECORD *wr;
 556
 557         wr= &(ssl->s3->wrec);
 558         i=COMP_compress_block(ssl->compress,wr->data,
 559                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 560                 wr->input,(int)wr->length);
 561         if (i < 0)
 562                 return(0);
 563         else
 564                 wr->length=i;
 565
 566         wr->input=wr->data;
 567 #endif
 568         return(1);
 569         }
 570
 571 /* Call this to write data in records of type 'type'
 572  * It will return <= 0 if not all data has been sent or non-blocking IO.
 573  */
 574 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 575         {
 576         const unsigned char *buf=buf_;
 577         unsigned int tot,n,nw;
 578         int i;
 579
 580         s->rwstate=SSL_NOTHING;
 581         tot=s->s3->wnum;
 582         s->s3->wnum=0;
 583
 584         if (SSL_in_init(s) && !s->in_handshake)
 585                 {
 586                 i=s->handshake_func(s);
 587                 if (i < 0) return(i);
 588                 if (i == 0)
 589                         {
 590                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 591                         return -1;
 592                         }
 593                 }
 594
 595         n=(len-tot);
 596         for (;;)
 597                 {
 598                 if (n > s->max_send_fragment)
 599                         nw=s->max_send_fragment;
 600                 else
 601                         nw=n;
 602
 603                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 604                 if (i <= 0)
 605                         {
 606                         s->s3->wnum=tot;
 607                         return i;
 608                         }
 609
 610                 if ((i == (int)n) ||
 611                         (type == SSL3_RT_APPLICATION_DATA &&
 612                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 613                         {
 614                         /* next chunk of data should get another prepended empty fragment
 615                          * in ciphersuites with known-IV weakness: */
 616                         s->s3->empty_fragment_done = 0;
 617
 618                         return tot+i;
 619                         }
 620
 621                 n-=i;
 622                 tot+=i;
 623                 }
 624         }
 625
 626 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 627                          unsigned int len, int create_empty_fragment)
 628         {
 629         unsigned char *p,*plen;
 630         int i,mac_size,clear=0;
 631         int prefix_len=0;
 632         long align=0;
 633         SSL3_RECORD *wr;
 634         SSL3_BUFFER *wb=&(s->s3->wbuf);
 635         SSL_SESSION *sess;
 636
 637         if (wb->buf == NULL)
 638                 if (!ssl3_setup_write_buffer(s))
 639                         return -1;
 640
 641         /* first check if there is a SSL3_BUFFER still being written
 642          * out.  This will happen with non blocking IO */
 643         if (wb->left != 0)
 644                 return(ssl3_write_pending(s,type,buf,len));
 645
 646         /* If we have an alert to send, lets send it */
 647         if (s->s3->alert_dispatch)
 648                 {
 649                 i=s->method->ssl_dispatch_alert(s);
 650                 if (i <= 0)
 651                         return(i);
 652                 /* if it went, fall through and send more stuff */
 653                 }
 654
 655         if (len == 0 && !create_empty_fragment)
 656                 return 0;
 657
 658         wr= &(s->s3->wrec);
 659         sess=s->session;
 660
 661         if (    (sess == NULL) ||
 662                 (s->enc_write_ctx == NULL) ||
 663                 (EVP_MD_CTX_md(s->write_hash) == NULL))
 664                 clear=1;
 665
 666         if (clear)
 667                 mac_size=0;
 668         else
 669                 {
 670                 mac_size=EVP_MD_CTX_size(s->write_hash);
 671                 if (mac_size < 0)
 672                         goto err;
 673                 }
 674
 675         /* 'create_empty_fragment' is true only when this function calls itself */
 676         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 677                 {
 678                 /* countermeasure against known-IV weakness in CBC ciphersuites
 679                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 680
 681                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 682                         {
 683                         /* recursive function call with 'create_empty_fragment' set;
 684                          * this prepares and buffers the data for an empty fragment
 685                          * (these 'prefix_len' bytes are sent out later
 686                          * together with the actual payload) */
 687                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 688                         if (prefix_len <= 0)
 689                                 goto err;
 690
 691                         if (prefix_len >
 692                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
 693                                 {
 694                                 /* insufficient space */
 695                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 696                                 goto err;
 697                                 }
 698                         }
 699
 700                 s->s3->empty_fragment_done = 1;
 701                 }
 702
 703         if (create_empty_fragment)
 704                 {
 705 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 706                 /* extra fragment would be couple of cipher blocks,
 707                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
 708                  * if we want to align the real payload, then we can
 709                  * just pretent we simply have two headers. */
 710                 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
 711                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 712 #endif
 713                 p = wb->buf + align;
 714                 wb->offset  = align;
 715                 }
 716         else if (prefix_len)
 717                 {
 718                 p = wb->buf + wb->offset + prefix_len;
 719                 }
 720         else
 721                 {
 722 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 723                 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
 724                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 725 #endif
 726                 p = wb->buf + align;
 727                 wb->offset  = align;
 728                 }
 729
 730         /* write the header */
 731
 732         *(p++)=type&0xff;
 733         wr->type=type;
 734
 735         *(p++)=(s->version>>8);
 736         *(p++)=s->version&0xff;
 737
 738         /* field where we are to write out packet length */
 739         plen=p;
 740         p+=2;
 741
 742         /* lets setup the record stuff. */
 743         wr->data=p;
 744         wr->length=(int)len;
 745         wr->input=(unsigned char *)buf;
 746
 747         /* we now 'read' from wr->input, wr->length bytes into
 748          * wr->data */
 749
 750         /* first we compress */
 751         if (s->compress != NULL)
 752                 {
 753                 if (!ssl3_do_compress(s))
 754                         {
 755                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 756                         goto err;
 757                         }
 758                 }
 759         else
 760                 {
 761                 memcpy(wr->data,wr->input,wr->length);
 762                 wr->input=wr->data;
 763                 }
 764
 765         /* we should still have the output to wr->data and the input
 766          * from wr->input.  Length should be wr->length.
 767          * wr->data still points in the wb->buf */
 768
 769         if (mac_size != 0)
 770                 {
 771                 if (s->method->ssl3_enc->mac(s,&(p[wr->length]),1) < 0)
 772                         goto err;
 773                 wr->length+=mac_size;
 774                 wr->input=p;
 775                 wr->data=p;
 776                 }
 777
 778         /* ssl3_enc can only have an error on read */
 779         s->method->ssl3_enc->enc(s,1);
 780
 781         /* record length after mac and block padding */
 782         s2n(wr->length,plen);
 783
 784         /* we should now have
 785          * wr->data pointing to the encrypted data, which is
 786          * wr->length long */
 787         wr->type=type; /* not needed but helps for debugging */
 788         wr->length+=SSL3_RT_HEADER_LENGTH;
 789
 790         if (create_empty_fragment)
 791                 {
 792                 /* we are in a recursive call;
 793                  * just return the length, don't write out anything here
 794                  */
 795                 return wr->length;
 796                 }
 797
 798         /* now let's set up wb */
 799         wb->left = prefix_len + wr->length;
 800
 801         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 802         s->s3->wpend_tot=len;
 803         s->s3->wpend_buf=buf;
 804         s->s3->wpend_type=type;
 805         s->s3->wpend_ret=len;
 806
 807         /* we now just need to write the buffer */
 808         return ssl3_write_pending(s,type,buf,len);
 809 err:
 810         return -1;
 811         }
 812
 813 /* if s->s3->wbuf.left != 0, we need to call this */
 814 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 815         unsigned int len)
 816         {
 817         int i;
 818         SSL3_BUFFER *wb=&(s->s3->wbuf);
 819
 820 /* XXXX */
 821         if ((s->s3->wpend_tot > (int)len)
 822                 || ((s->s3->wpend_buf != buf) &&
 823                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 824                 || (s->s3->wpend_type != type))
 825                 {
 826                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 827                 return(-1);
 828                 }
 829
 830         for (;;)
 831                 {
 832                 clear_sys_error();
 833                 if (s->wbio != NULL)
 834                         {
 835                         s->rwstate=SSL_WRITING;
 836                         i=BIO_write(s->wbio,
 837                                 (char *)&(wb->buf[wb->offset]),
 838                                 (unsigned int)wb->left);
 839                         }
 840                 else
 841                         {
 842                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 843                         i= -1;
 844                         }
 845                 if (i == wb->left)
 846                         {
 847                         wb->left=0;
 848                         wb->offset+=i;
 849                         if (s->mode & SSL_MODE_RELEASE_BUFFERS)
 850                                 ssl3_release_write_buffer(s);
 851                         s->rwstate=SSL_NOTHING;
 852                         return(s->s3->wpend_ret);
 853                         }
 854                 else if (i <= 0) {
 855                         if (s->version == DTLS1_VERSION ||
 856                             s->version == DTLS1_BAD_VER) {
 857                                 /* For DTLS, just drop it. That's kind of the whole
 858                                    point in using a datagram service */
 859                                 wb->left = 0;
 860                         }
 861                         return(i);
 862                 }
 863                 wb->offset+=i;
 864                 wb->left-=i;
 865                 }
 866         }
 867
 868 /* Return up to 'len' payload bytes received in 'type' records.
 869  * 'type' is one of the following:
 870  *
 871  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 872  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 873  *   -  0 (during a shutdown, no data has to be returned)
 874  *
 875  * If we don't have stored data to work from, read a SSL/TLS record first
 876  * (possibly multiple records if we still don't have anything to return).
 877  *
 878  * This function must handle any surprises the peer may have for us, such as
 879  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 880  * a surprise, but handled as if it were), or renegotiation requests.
 881  * Also if record payloads contain fragments too small to process, we store
 882  * them until there is enough for the respective protocol (the record protocol
 883  * may use arbitrary fragmentation and even interleaving):
 884  *     Change cipher spec protocol
 885  *             just 1 byte needed, no need for keeping anything stored
 886  *     Alert protocol
 887  *             2 bytes needed (AlertLevel, AlertDescription)
 888  *     Handshake protocol
 889  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 890  *             to detect unexpected Client Hello and Hello Request messages
 891  *             here, anything else is handled by higher layers
 892  *     Application data protocol
 893  *             none of our business
 894  */
 895 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 896         {
 897         int al,i,j,ret;
 898         unsigned int n;
 899         SSL3_RECORD *rr;
 900         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 901
 902         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 903                 if (!ssl3_setup_read_buffer(s))
 904                         return(-1);
 905
 906         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 907             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 908                 {
 909                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 910                 return -1;
 911                 }
 912
 913         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 914                 /* (partially) satisfy request from storage */
 915                 {
 916                 unsigned char *src = s->s3->handshake_fragment;
 917                 unsigned char *dst = buf;
 918                 unsigned int k;
 919
 920                 /* peek == 0 */
 921                 n = 0;
 922                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 923                         {
 924                         *dst++ = *src++;
 925                         len--; s->s3->handshake_fragment_len--;
 926                         n++;
 927                         }
 928                 /* move any remaining fragment bytes: */
 929                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 930                         s->s3->handshake_fragment[k] = *src++;
 931                 return n;
 932         }
 933
 934         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 935
 936         if (!s->in_handshake && SSL_in_init(s))
 937                 {
 938                 /* type == SSL3_RT_APPLICATION_DATA */
 939                 i=s->handshake_func(s);
 940                 if (i < 0) return(i);
 941                 if (i == 0)
 942                         {
 943                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 944                         return(-1);
 945                         }
 946                 }
 947 start:
 948         s->rwstate=SSL_NOTHING;
 949
 950         /* s->s3->rrec.type         - is the type of record
 951          * s->s3->rrec.data,    - data
 952          * s->s3->rrec.off,     - offset into 'data' for next read
 953          * s->s3->rrec.length,  - number of bytes. */
 954         rr = &(s->s3->rrec);
 955
 956         /* get new packet if necessary */
 957         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 958                 {
 959                 ret=ssl3_get_record(s);
 960                 if (ret <= 0) return(ret);
 961                 }
 962
 963         /* we now have a packet which can be read and processed */
 964
 965         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 966                                        * reset by ssl3_get_finished */
 967                 && (rr->type != SSL3_RT_HANDSHAKE))
 968                 {
 969                 al=SSL_AD_UNEXPECTED_MESSAGE;
 970                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 971                 goto f_err;
 972                 }
 973
 974         /* If the other end has shut down, throw anything we read away
 975          * (even in 'peek' mode) */
 976         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 977                 {
 978                 rr->length=0;
 979                 s->rwstate=SSL_NOTHING;
 980                 return(0);
 981                 }
 982
 983
 984         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 985                 {
 986                 /* make sure that we are not getting application data when we
 987                  * are doing a handshake for the first time */
 988                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 989                         (s->enc_read_ctx == NULL))
 990                         {
 991                         al=SSL_AD_UNEXPECTED_MESSAGE;
 992                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 993                         goto f_err;
 994                         }
 995
 996                 if (len <= 0) return(len);
 997
 998                 if ((unsigned int)len > rr->length)
 999                         n = rr->length;
1000                 else
1001                         n = (unsigned int)len;
1002
1003                 memcpy(buf,&(rr->data[rr->off]),n);
1004                 if (!peek)
1005                         {
1006                         rr->length-=n;
1007                         rr->off+=n;
1008                         if (rr->length == 0)
1009                                 {
1010                                 s->rstate=SSL_ST_READ_HEADER;
1011                                 rr->off=0;
1012                                 if (s->mode & SSL_MODE_RELEASE_BUFFERS)
1013                                         ssl3_release_read_buffer(s);
1014                                 }
1015                         }
1016                 return(n);
1017                 }
1018
1019
1020         /* If we get here, then type != rr->type; if we have a handshake
1021          * message, then it was unexpected (Hello Request or Client Hello). */
1022
1023         /* In case of record types for which we have 'fragment' storage,
1024          * fill that so that we can process the data at a fixed place.
1025          */
1026                 {
1027                 unsigned int dest_maxlen = 0;
1028                 unsigned char *dest = NULL;
1029                 unsigned int *dest_len = NULL;
1030
1031                 if (rr->type == SSL3_RT_HANDSHAKE)
1032                         {
1033                         dest_maxlen = sizeof s->s3->handshake_fragment;
1034                         dest = s->s3->handshake_fragment;
1035                         dest_len = &s->s3->handshake_fragment_len;
1036                         }
1037                 else if (rr->type == SSL3_RT_ALERT)
1038                         {
1039                         dest_maxlen = sizeof s->s3->alert_fragment;
1040                         dest = s->s3->alert_fragment;
1041                         dest_len = &s->s3->alert_fragment_len;
1042                         }
1043
1044                 if (dest_maxlen > 0)
1045                         {
1046                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1047                         if (rr->length < n)
1048                                 n = rr->length; /* available bytes */
1049
1050                         /* now move 'n' bytes: */
1051                         while (n-- > 0)
1052                                 {
1053                                 dest[(*dest_len)++] = rr->data[rr->off++];
1054                                 rr->length--;
1055                                 }
1056
1057                         if (*dest_len < dest_maxlen)
1058                                 goto start; /* fragment was too small */
1059                         }
1060                 }
1061
1062         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1063          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1064          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1065
1066         /* If we are a client, check for an incoming 'Hello Request': */
1067         if ((!s->server) &&
1068                 (s->s3->handshake_fragment_len >= 4) &&
1069                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1070                 (s->session != NULL) && (s->session->cipher != NULL))
1071                 {
1072                 s->s3->handshake_fragment_len = 0;
1073
1074                 if ((s->s3->handshake_fragment[1] != 0) ||
1075                         (s->s3->handshake_fragment[2] != 0) ||
1076                         (s->s3->handshake_fragment[3] != 0))
1077                         {
1078                         al=SSL_AD_DECODE_ERROR;
1079                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1080                         goto f_err;
1081                         }
1082
1083                 if (s->msg_callback)
1084                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1085
1086                 if (SSL_is_init_finished(s) &&
1087                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1088                         !s->s3->renegotiate)
1089                         {
1090                         ssl3_renegotiate(s);
1091                         if (ssl3_renegotiate_check(s))
1092                                 {
1093                                 i=s->handshake_func(s);
1094                                 if (i < 0) return(i);
1095                                 if (i == 0)
1096                                         {
1097                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1098                                         return(-1);
1099                                         }
1100
1101                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1102                                         {
1103                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1104                                                 {
1105                                                 BIO *bio;
1106                                                 /* In the case where we try to read application data,
1107                                                  * but we trigger an SSL handshake, we return -1 with
1108                                                  * the retry option set.  Otherwise renegotiation may
1109                                                  * cause nasty problems in the blocking world */
1110                                                 s->rwstate=SSL_READING;
1111                                                 bio=SSL_get_rbio(s);
1112                                                 BIO_clear_retry_flags(bio);
1113                                                 BIO_set_retry_read(bio);
1114                                                 return(-1);
1115                                                 }
1116                                         }
1117                                 }
1118                         }
1119                 /* we either finished a handshake or ignored the request,
1120                  * now try again to obtain the (application) data we were asked for */
1121                 goto start;
1122                 }
1123
1124         if (s->s3->alert_fragment_len >= 2)
1125                 {
1126                 int alert_level = s->s3->alert_fragment[0];
1127                 int alert_descr = s->s3->alert_fragment[1];
1128
1129                 s->s3->alert_fragment_len = 0;
1130
1131                 if (s->msg_callback)
1132                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1133
1134                 if (s->info_callback != NULL)
1135                         cb=s->info_callback;
1136                 else if (s->ctx->info_callback != NULL)
1137                         cb=s->ctx->info_callback;
1138
1139                 if (cb != NULL)
1140                         {
1141                         j = (alert_level << 8) | alert_descr;
1142                         cb(s, SSL_CB_READ_ALERT, j);
1143                         }
1144
1145                 if (alert_level == 1) /* warning */
1146                         {
1147                         s->s3->warn_alert = alert_descr;
1148                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1149                                 {
1150                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1151                                 return(0);
1152                                 }
1153                         }
1154                 else if (alert_level == 2) /* fatal */
1155                         {
1156                         char tmp[16];
1157
1158                         s->rwstate=SSL_NOTHING;
1159                         s->s3->fatal_alert = alert_descr;
1160                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1161                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1162                         ERR_add_error_data(2,"SSL alert number ",tmp);
1163                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1164                         SSL_CTX_remove_session(s->ctx,s->session);
1165                         return(0);
1166                         }
1167                 else
1168                         {
1169                         al=SSL_AD_ILLEGAL_PARAMETER;
1170                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1171                         goto f_err;
1172                         }
1173
1174                 goto start;
1175                 }
1176
1177         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1178                 {
1179                 s->rwstate=SSL_NOTHING;
1180                 rr->length=0;
1181                 return(0);
1182                 }
1183
1184         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1185                 {
1186                 /* 'Change Cipher Spec' is just a single byte, so we know
1187                  * exactly what the record payload has to look like */
1188                 if (    (rr->length != 1) || (rr->off != 0) ||
1189                         (rr->data[0] != SSL3_MT_CCS))
1190                         {
1191                         al=SSL_AD_ILLEGAL_PARAMETER;
1192                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1193                         goto f_err;
1194                         }
1195
1196                 /* Check we have a cipher to change to */
1197                 if (s->s3->tmp.new_cipher == NULL)
1198                         {
1199                         al=SSL_AD_UNEXPECTED_MESSAGE;
1200                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1201                         goto f_err;
1202                         }
1203
1204                 rr->length=0;
1205
1206                 if (s->msg_callback)
1207                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1208
1209                 s->s3->change_cipher_spec=1;
1210                 if (!ssl3_do_change_cipher_spec(s))
1211                         goto err;
1212                 else
1213                         goto start;
1214                 }
1215
1216         /* Unexpected handshake message (Client Hello, or protocol violation) */
1217         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1218                 {
1219                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1220                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1221                         {
1222 #if 0 /* worked only because C operator preferences are not as expected (and
1223        * because this is not really needed for clients except for detecting
1224        * protocol violations): */
1225                         s->state=SSL_ST_BEFORE|(s->server)
1226                                 ?SSL_ST_ACCEPT
1227                                 :SSL_ST_CONNECT;
1228 #else
1229                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1230 #endif
1231                         s->new_session=1;
1232                         }
1233                 i=s->handshake_func(s);
1234                 if (i < 0) return(i);
1235                 if (i == 0)
1236                         {
1237                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1238                         return(-1);
1239                         }
1240
1241                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1242                         {
1243                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1244                                 {
1245                                 BIO *bio;
1246                                 /* In the case where we try to read application data,
1247                                  * but we trigger an SSL handshake, we return -1 with
1248                                  * the retry option set.  Otherwise renegotiation may
1249                                  * cause nasty problems in the blocking world */
1250                                 s->rwstate=SSL_READING;
1251                                 bio=SSL_get_rbio(s);
1252                                 BIO_clear_retry_flags(bio);
1253                                 BIO_set_retry_read(bio);
1254                                 return(-1);
1255                                 }
1256                         }
1257                 goto start;
1258                 }
1259
1260         switch (rr->type)
1261                 {
1262         default:
1263 #ifndef OPENSSL_NO_TLS
1264                 /* TLS just ignores unknown message types */
1265                 if (s->version == TLS1_VERSION)
1266                         {
1267                         rr->length = 0;
1268                         goto start;
1269                         }
1270 #endif
1271                 al=SSL_AD_UNEXPECTED_MESSAGE;
1272                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1273                 goto f_err;
1274         case SSL3_RT_CHANGE_CIPHER_SPEC:
1275         case SSL3_RT_ALERT:
1276         case SSL3_RT_HANDSHAKE:
1277                 /* we already handled all of these, with the possible exception
1278                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1279                  * should not happen when type != rr->type */
1280                 al=SSL_AD_UNEXPECTED_MESSAGE;
1281                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1282                 goto f_err;
1283         case SSL3_RT_APPLICATION_DATA:
1284                 /* At this point, we were expecting handshake data,
1285                  * but have application data.  If the library was
1286                  * running inside ssl3_read() (i.e. in_read_app_data
1287                  * is set) and it makes sense to read application data
1288                  * at this point (session renegotiation not yet started),
1289                  * we will indulge it.
1290                  */
1291                 if (s->s3->in_read_app_data &&
1292                         (s->s3->total_renegotiations != 0) &&
1293                         ((
1294                                 (s->state & SSL_ST_CONNECT) &&
1295                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1296                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1297                                 ) || (
1298                                         (s->state & SSL_ST_ACCEPT) &&
1299                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1300                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1301                                         )
1302                                 ))
1303                         {
1304                         s->s3->in_read_app_data=2;
1305                         return(-1);
1306                         }
1307                 else
1308                         {
1309                         al=SSL_AD_UNEXPECTED_MESSAGE;
1310                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1311                         goto f_err;
1312                         }
1313                 }
1314         /* not reached */
1315
1316 f_err:
1317         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1318 err:
1319         return(-1);
1320         }
1321
1322 int ssl3_do_change_cipher_spec(SSL *s)
1323         {
1324         int i;
1325         const char *sender;
1326         int slen;
1327
1328         if (s->state & SSL_ST_ACCEPT)
1329                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1330         else
1331                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1332
1333         if (s->s3->tmp.key_block == NULL)
1334                 {
1335                 if (s->session == NULL)
1336                         {
1337                         /* might happen if dtls1_read_bytes() calls this */
1338                         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1339                         return (0);
1340                         }
1341
1342                 s->session->cipher=s->s3->tmp.new_cipher;
1343                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1344                 }
1345
1346         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1347                 return(0);
1348
1349         /* we have to record the message digest at
1350          * this point so we can get it before we read
1351          * the finished message */
1352         if (s->state & SSL_ST_CONNECT)
1353                 {
1354                 sender=s->method->ssl3_enc->server_finished_label;
1355                 slen=s->method->ssl3_enc->server_finished_label_len;
1356                 }
1357         else
1358                 {
1359                 sender=s->method->ssl3_enc->client_finished_label;
1360                 slen=s->method->ssl3_enc->client_finished_label_len;
1361                 }
1362
1363         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1364                 sender,slen,s->s3->tmp.peer_finish_md);
1365
1366         return(1);
1367         }
1368
1369 int ssl3_send_alert(SSL *s, int level, int desc)
1370         {
1371         /* Map tls/ssl alert value to correct one */
1372         desc=s->method->ssl3_enc->alert_value(desc);
1373         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1374                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1375         if (desc < 0) return -1;
1376         /* If a fatal one, remove from cache */
1377         if ((level == 2) && (s->session != NULL))
1378                 SSL_CTX_remove_session(s->ctx,s->session);
1379
1380         s->s3->alert_dispatch=1;
1381         s->s3->send_alert[0]=level;
1382         s->s3->send_alert[1]=desc;
1383         if (s->s3->wbuf.left == 0) /* data still being written out? */
1384                 return s->method->ssl_dispatch_alert(s);
1385         /* else data is still being written out, we will get written
1386          * some time in the future */
1387         return -1;
1388         }
1389
1390 int ssl3_dispatch_alert(SSL *s)
1391         {
1392         int i,j;
1393         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1394
1395         s->s3->alert_dispatch=0;
1396         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1397         if (i <= 0)
1398                 {
1399                 s->s3->alert_dispatch=1;
1400                 }
1401         else
1402                 {
1403                 /* Alert sent to BIO.  If it is important, flush it now.
1404                  * If the message does not get sent due to non-blocking IO,
1405                  * we will not worry too much. */
1406                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1407                         (void)BIO_flush(s->wbio);
1408
1409                 if (s->msg_callback)
1410                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1411
1412                 if (s->info_callback != NULL)
1413                         cb=s->info_callback;
1414                 else if (s->ctx->info_callback != NULL)
1415                         cb=s->ctx->info_callback;
1416
1417                 if (cb != NULL)
1418                         {
1419                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1420                         cb(s,SSL_CB_WRITE_ALERT,j);
1421                         }
1422                 }
1423         return(i);
1424         }