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) 1998-1999 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include <errno.h>
 114 #define USE_SOCKETS
 115 #include <openssl/evp.h>
 116 #include <openssl/buffer.h>
 117 #include "ssl_locl.h"
 118
 119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 120                          unsigned int len);
 121 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 122                               unsigned int len);
 123 static int ssl3_get_record(SSL *s);
 124 static int do_compress(SSL *ssl);
 125 static int do_uncompress(SSL *ssl);
 126 static int do_change_cipher_spec(SSL *ssl);
 127
 128 static int ssl3_read_n(SSL *s, int n, int max, int extend)
 129         {
 130         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
 131          * packet by another n bytes.
 132          * The packet will be in the sub-array of s->s3->rbuf.buf specified
 133          * by s->packet and s->packet_length.
 134          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
 135          * [plus s->packet_length bytes if extend == 1].)
 136          */
 137         int i,off,newb;
 138
 139         if (!extend)
 140                 {
 141                 /* start with empty packet ... */
 142                 if (s->s3->rbuf.left == 0)
 143                         s->s3->rbuf.offset = 0;
 144                 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
 145                 s->packet_length = 0;
 146                 /* ... now we can act as if 'extend' was set */
 147                 }
 148
 149         /* if there is enough in the buffer from a previous read, take some */
 150         if (s->s3->rbuf.left >= (int)n)
 151                 {
 152                 s->packet_length+=n;
 153                 s->s3->rbuf.left-=n;
 154                 s->s3->rbuf.offset+=n;
 155                 return(n);
 156                 }
 157
 158         /* else we need to read more data */
 159         if (!s->read_ahead)
 160                 max=n;
 161
 162         {
 163                 /* avoid buffer overflow */
 164                 int max_max = SSL3_RT_MAX_PACKET_SIZE - s->packet_length;
 165                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 166                         max_max += SSL3_RT_MAX_EXTRA;
 167                 if (max > max_max)
 168                         max = max_max;
 169         }
 170         if (n > max) /* does not happen */
 171                 {
 172                 SSLerr(SSL_F_SSL3_READ_N,SSL_R_INTERNAL_ERROR);
 173                 return -1;
 174                 }
 175
 176         off = s->packet_length;
 177         newb = s->s3->rbuf.left;
 178         /* Move any available bytes to front of buffer:
 179          * 'off' bytes already pointed to by 'packet',
 180          * 'newb' extra ones at the end */
 181         if (s->packet != s->s3->rbuf.buf)
 182                 {
 183                 /*  off > 0 */
 184                 memmove(s->s3->rbuf.buf, s->packet, off+newb);
 185                 s->packet = s->s3->rbuf.buf;
 186                 }
 187
 188         while (newb < n)
 189                 {
 190                 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
 191                  * to read in more until we have off+n (up to off+max if possible) */
 192
 193                 clear_sys_error();
 194                 if (s->rbio != NULL)
 195                         {
 196                         s->rwstate=SSL_READING;
 197                         i=BIO_read(s->rbio,     &(s->s3->rbuf.buf[off+newb]), max-newb);
 198                         }
 199                 else
 200                         {
 201                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 202                         i = -1;
 203                         }
 204
 205                 if (i <= 0)
 206                         {
 207                         s->s3->rbuf.left = newb;
 208                         return(i);
 209                         }
 210                 newb+=i;
 211                 }
 212
 213         /* done reading, now the book-keeping */
 214         s->s3->rbuf.offset = off + n;
 215         s->s3->rbuf.left = newb - n;
 216         s->packet_length += n;
 217         return(n);
 218         }
 219
 220 /* Call this to get a new input record.
 221  * It will return <= 0 if more data is needed, normally due to an error
 222  * or non-blocking IO.
 223  * When it finishes, one packet has been decoded and can be found in
 224  * ssl->s3->rrec.type    - is the type of record
 225  * ssl->s3->rrec.data,   - data
 226  * ssl->s3->rrec.length, - number of bytes
 227  */
 228 static int ssl3_get_record(SSL *s)
 229         {
 230         int ssl_major,ssl_minor,al;
 231         int n,i,ret= -1;
 232         SSL3_BUFFER *rb;
 233         SSL3_RECORD *rr;
 234         SSL_SESSION *sess;
 235         unsigned char *p;
 236         unsigned char md[EVP_MAX_MD_SIZE];
 237         short version;
 238         unsigned int mac_size;
 239         int clear=0,extra;
 240
 241         rr= &(s->s3->rrec);
 242         rb= &(s->s3->rbuf);
 243         sess=s->session;
 244
 245         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 246                 extra=SSL3_RT_MAX_EXTRA;
 247         else
 248                 extra=0;
 249
 250 again:
 251         /* check if we have the header */
 252         if (    (s->rstate != SSL_ST_READ_BODY) ||
 253                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 254                 {
 255                 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
 256                         SSL3_RT_MAX_PACKET_SIZE,0);
 257                 if (n <= 0) return(n); /* error or non-blocking */
 258                 s->rstate=SSL_ST_READ_BODY;
 259
 260                 p=s->packet;
 261
 262                 /* Pull apart the header into the SSL3_RECORD */
 263                 rr->type= *(p++);
 264                 ssl_major= *(p++);
 265                 ssl_minor= *(p++);
 266                 version=(ssl_major<<8)|ssl_minor;
 267                 n2s(p,rr->length);
 268
 269                 /* Lets check version */
 270                 if (s->first_packet)
 271                         {
 272                         s->first_packet=0;
 273                         }
 274                 else
 275                         {
 276                         if (version != s->version)
 277                                 {
 278                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 279                                 /* Send back error using their
 280                                  * version number :-) */
 281                                 s->version=version;
 282                                 al=SSL_AD_PROTOCOL_VERSION;
 283                                 goto f_err;
 284                                 }
 285                         }
 286
 287                 if ((version>>8) != SSL3_VERSION_MAJOR)
 288                         {
 289                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 290                         goto err;
 291                         }
 292
 293                 if (rr->length >
 294                         (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 295                         {
 296                         al=SSL_AD_RECORD_OVERFLOW;
 297                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 298                         goto f_err;
 299                         }
 300
 301                 /* now s->rstate == SSL_ST_READ_BODY; */
 302                 }
 303
 304         /* get and decode the data */
 305         if (s->rstate == SSL_ST_READ_BODY)
 306                 {
 307                 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
 308                         {
 309                         i=rr->length;
 310                         n=ssl3_read_n(s,i,i,1);
 311                         if (n <= 0) return(n); /* error or non-blocking io */
 312                         }
 313                 s->rstate=SSL_ST_READ_HEADER;
 314                 }
 315
 316         /* At this point, we have the data in s->packet and there should be
 317          * s->packet_length bytes, we must not 'overrun' this buffer :-)
 318          * One of the following functions will copy the data from the
 319          * s->packet buffer */
 320
 321         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 322
 323         /* ok, we can now read from 's->packet' data into 'rr'
 324          * rr->input points at rr->length bytes, which
 325          * need to be copied into rr->data by either
 326          * the decryption or by the decompression
 327          * When the data is 'copied' into the rr->data buffer,
 328          * rr->input will be pointed at the new buffer */
 329
 330         /* Set the state for the following operations */
 331         s->rstate=SSL_ST_READ_HEADER;
 332
 333         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 334          * rr->length bytes of encrypted compressed stuff. */
 335
 336         /* check is not needed I belive */
 337         if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 338                 {
 339                 al=SSL_AD_RECORD_OVERFLOW;
 340                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 341                 goto f_err;
 342                 }
 343
 344         /* decrypt in place in 'rr->input' */
 345         rr->data=rr->input;
 346
 347         if (!s->method->ssl3_enc->enc(s,0))
 348                 {
 349                 al=SSL_AD_DECRYPT_ERROR;
 350                 goto f_err;
 351                 }
 352 #ifdef TLS_DEBUG
 353 printf("dec %d\n",rr->length);
 354 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 355 printf("\n");
 356 #endif
 357         /* r->length is now the compressed data plus mac */
 358         if (    (sess == NULL) ||
 359                 (s->enc_read_ctx == NULL) ||
 360                 (s->read_hash == NULL))
 361                 clear=1;
 362
 363         if (!clear)
 364                 {
 365                 mac_size=EVP_MD_size(s->read_hash);
 366
 367                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 368                         {
 369                         al=SSL_AD_RECORD_OVERFLOW;
 370                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 371                         goto f_err;
 372                         }
 373                 /* check MAC for rr->input' */
 374                 if (rr->length < mac_size)
 375                         {
 376                         al=SSL_AD_DECODE_ERROR;
 377                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 378                         goto f_err;
 379                         }
 380                 rr->length-=mac_size;
 381                 i=s->method->ssl3_enc->mac(s,md,0);
 382                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 383                         {
 384                         al=SSL_AD_BAD_RECORD_MAC;
 385                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
 386                         ret= -1;
 387                         goto f_err;
 388                         }
 389                 }
 390
 391         /* r->length is now just compressed */
 392         if (s->expand != NULL)
 393                 {
 394                 if (rr->length >
 395                         (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 396                         {
 397                         al=SSL_AD_RECORD_OVERFLOW;
 398                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 399                         goto f_err;
 400                         }
 401                 if (!do_uncompress(s))
 402                         {
 403                         al=SSL_AD_DECOMPRESSION_FAILURE;
 404                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 405                         goto f_err;
 406                         }
 407                 }
 408
 409         if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
 410                 {
 411                 al=SSL_AD_RECORD_OVERFLOW;
 412                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 413                 goto f_err;
 414                 }
 415
 416         rr->off=0;
 417         /* So at this point the following is true
 418          * ssl->s3->rrec.type   is the type of record
 419          * ssl->s3->rrec.length == number of bytes in record
 420          * ssl->s3->rrec.off    == offset to first valid byte
 421          * ssl->s3->rrec.data   == where to take bytes from, increment
 422          *                         after use :-).
 423          */
 424
 425         /* we have pulled in a full packet so zero things */
 426         s->packet_length=0;
 427
 428         /* just read a 0 length packet */
 429         if (rr->length == 0) goto again;
 430
 431         return(1);
 432 f_err:
 433         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 434 err:
 435         return(ret);
 436         }
 437
 438 static int do_uncompress(SSL *ssl)
 439         {
 440         int i;
 441         SSL3_RECORD *rr;
 442
 443         rr= &(ssl->s3->rrec);
 444         i=COMP_expand_block(ssl->expand,rr->comp,
 445                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 446         if (i < 0)
 447                 return(0);
 448         else
 449                 rr->length=i;
 450         rr->data=rr->comp;
 451
 452         return(1);
 453         }
 454
 455 static int do_compress(SSL *ssl)
 456         {
 457         int i;
 458         SSL3_RECORD *wr;
 459
 460         wr= &(ssl->s3->wrec);
 461         i=COMP_compress_block(ssl->compress,wr->data,
 462                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 463                 wr->input,(int)wr->length);
 464         if (i < 0)
 465                 return(0);
 466         else
 467                 wr->length=i;
 468
 469         wr->input=wr->data;
 470         return(1);
 471         }
 472
 473 /* Call this to write data
 474  * It will return <= 0 if not all data has been sent or non-blocking IO.
 475  */
 476 int ssl3_write_bytes(SSL *s, int type, const void *_buf, int len)
 477         {
 478         const unsigned char *buf=_buf;
 479         unsigned int tot,n,nw;
 480         int i;
 481
 482         s->rwstate=SSL_NOTHING;
 483         tot=s->s3->wnum;
 484         s->s3->wnum=0;
 485
 486         if (SSL_in_init(s) && !s->in_handshake)
 487                 {
 488                 i=s->handshake_func(s);
 489                 if (i < 0) return(i);
 490                 if (i == 0)
 491                         {
 492                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 493                         return(-1);
 494                         }
 495                 }
 496
 497         n=(len-tot);
 498         for (;;)
 499                 {
 500                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 501                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 502                 else
 503                         nw=n;
 504
 505                 i=do_ssl3_write(s,type,&(buf[tot]),nw);
 506                 if (i <= 0)
 507                         {
 508                         s->s3->wnum=tot;
 509                         return(i);
 510                         }
 511
 512                 if (type == SSL3_RT_HANDSHAKE)
 513                         ssl3_finish_mac(s,&(buf[tot]),i);
 514
 515                 if ((i == (int)n) ||
 516                         (type == SSL3_RT_APPLICATION_DATA &&
 517                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 518                         {
 519                         return(tot+i);
 520                         }
 521
 522                 n-=i;
 523                 tot+=i;
 524                 }
 525         }
 526
 527 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 528                          unsigned int len)
 529         {
 530         unsigned char *p,*plen;
 531         int i,mac_size,clear=0;
 532         SSL3_RECORD *wr;
 533         SSL3_BUFFER *wb;
 534         SSL_SESSION *sess;
 535
 536         /* first check is there is a SSL3_RECORD still being written
 537          * out.  This will happen with non blocking IO */
 538         if (s->s3->wbuf.left != 0)
 539                 return(ssl3_write_pending(s,type,buf,len));
 540
 541         /* If we have an alert to send, lets send it */
 542         if (s->s3->alert_dispatch)
 543                 {
 544                 i=ssl3_dispatch_alert(s);
 545                 if (i <= 0)
 546                         return(i);
 547                 /* if it went, fall through and send more stuff */
 548                 }
 549
 550         if (len <= 0) return(len);
 551
 552         wr= &(s->s3->wrec);
 553         wb= &(s->s3->wbuf);
 554         sess=s->session;
 555
 556         if (    (sess == NULL) ||
 557                 (s->enc_write_ctx == NULL) ||
 558                 (s->write_hash == NULL))
 559                 clear=1;
 560
 561         if (clear)
 562                 mac_size=0;
 563         else
 564                 mac_size=EVP_MD_size(s->write_hash);
 565
 566         p=wb->buf;
 567
 568         /* write the header */
 569         *(p++)=type&0xff;
 570         wr->type=type;
 571
 572         *(p++)=(s->version>>8);
 573         *(p++)=s->version&0xff;
 574
 575         /* record where we are to write out packet length */
 576         plen=p;
 577         p+=2;
 578
 579         /* lets setup the record stuff. */
 580         wr->data=p;
 581         wr->length=(int)len;
 582         wr->input=(unsigned char *)buf;
 583
 584         /* we now 'read' from wr->input, wr->length bytes into
 585          * wr->data */
 586
 587         /* first we compress */
 588         if (s->compress != NULL)
 589                 {
 590                 if (!do_compress(s))
 591                         {
 592                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 593                         goto err;
 594                         }
 595                 }
 596         else
 597                 {
 598                 memcpy(wr->data,wr->input,wr->length);
 599                 wr->input=wr->data;
 600                 }
 601
 602         /* we should still have the output to wr->data and the input
 603          * from wr->input.  Length should be wr->length.
 604          * wr->data still points in the wb->buf */
 605
 606         if (mac_size != 0)
 607                 {
 608                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 609                 wr->length+=mac_size;
 610                 wr->input=p;
 611                 wr->data=p;
 612                 }
 613
 614         /* ssl3_enc can only have an error on read */
 615         s->method->ssl3_enc->enc(s,1);
 616
 617         /* record length after mac and block padding */
 618         s2n(wr->length,plen);
 619
 620         /* we should now have
 621          * wr->data pointing to the encrypted data, which is
 622          * wr->length long */
 623         wr->type=type; /* not needed but helps for debugging */
 624         wr->length+=SSL3_RT_HEADER_LENGTH;
 625
 626         /* Now lets setup wb */
 627         wb->left=wr->length;
 628         wb->offset=0;
 629
 630         s->s3->wpend_tot=len;
 631         s->s3->wpend_buf=buf;
 632         s->s3->wpend_type=type;
 633         s->s3->wpend_ret=len;
 634
 635         /* we now just need to write the buffer */
 636         return(ssl3_write_pending(s,type,buf,len));
 637 err:
 638         return(-1);
 639         }
 640
 641 /* if s->s3->wbuf.left != 0, we need to call this */
 642 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 643                               unsigned int len)
 644         {
 645         int i;
 646
 647 /* XXXX */
 648         if ((s->s3->wpend_tot > (int)len)
 649                 || ((s->s3->wpend_buf != buf) &&
 650                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 651                 || (s->s3->wpend_type != type))
 652                 {
 653                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 654                 return(-1);
 655                 }
 656
 657         for (;;)
 658                 {
 659                 clear_sys_error();
 660                 if (s->wbio != NULL)
 661                         {
 662                         s->rwstate=SSL_WRITING;
 663                         i=BIO_write(s->wbio,
 664                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 665                                 (unsigned int)s->s3->wbuf.left);
 666                         }
 667                 else
 668                         {
 669                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 670                         i= -1;
 671                         }
 672                 if (i == s->s3->wbuf.left)
 673                         {
 674                         s->s3->wbuf.left=0;
 675                         s->rwstate=SSL_NOTHING;
 676                         return(s->s3->wpend_ret);
 677                         }
 678                 else if (i <= 0)
 679                         return(i);
 680                 s->s3->wbuf.offset+=i;
 681                 s->s3->wbuf.left-=i;
 682                 }
 683         }
 684
 685 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len)
 686         {
 687         int al,i,j,n,ret;
 688         SSL3_RECORD *rr;
 689         void (*cb)()=NULL;
 690         BIO *bio;
 691
 692         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 693                 if (!ssl3_setup_buffers(s))
 694                         return(-1);
 695
 696         if (!s->in_handshake && SSL_in_init(s))
 697                 {
 698                 i=s->handshake_func(s);
 699                 if (i < 0) return(i);
 700                 if (i == 0)
 701                         {
 702                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 703                         return(-1);
 704                         }
 705                 }
 706 start:
 707         s->rwstate=SSL_NOTHING;
 708
 709         /* s->s3->rrec.type         - is the type of record
 710          * s->s3->rrec.data,    - data
 711          * s->s3->rrec.off,     - offset into 'data' for next read
 712          * s->s3->rrec.length,  - number of bytes. */
 713         rr= &(s->s3->rrec);
 714
 715         /* get new packet */
 716         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 717                 {
 718                 ret=ssl3_get_record(s);
 719                 if (ret <= 0) return(ret);
 720                 }
 721
 722         /* we now have a packet which can be read and processed */
 723
 724         if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
 725                 {
 726                 al=SSL_AD_UNEXPECTED_MESSAGE;
 727                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 728                 goto err;
 729                 }
 730
 731         /* If the other end has shutdown, throw anything we read away */
 732         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 733                 {
 734                 rr->length=0;
 735                 s->rwstate=SSL_NOTHING;
 736                 return(0);
 737                 }
 738
 739         /* Check for an incoming 'Hello Request' message from client */
 740         if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
 741                 (rr->data[0] == SSL3_MT_HELLO_REQUEST) &&
 742                 (s->session != NULL) && (s->session->cipher != NULL))
 743                 {
 744                 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
 745                         (rr->data[3] != 0))
 746                         {
 747                         al=SSL_AD_DECODE_ERROR;
 748                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 749                         goto err;
 750                         }
 751
 752                 if (SSL_is_init_finished(s) &&
 753                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 754                         !s->s3->renegotiate)
 755                         {
 756                         ssl3_renegotiate(s);
 757                         if (ssl3_renegotiate_check(s))
 758                                 {
 759                                 n=s->handshake_func(s);
 760                                 if (n < 0) return(n);
 761                                 if (n == 0)
 762                                         {
 763                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 764                                         return(-1);
 765                                         }
 766                                 }
 767                         }
 768                 rr->length=0;
 769 /* ZZZ */       goto start;
 770                 }
 771
 772         /* if it is not the type we want, or we have shutdown and want
 773          * the peer shutdown */
 774         if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
 775                 {
 776                 if (rr->type == SSL3_RT_ALERT)
 777                         {
 778                         if ((rr->length != 2) || (rr->off != 0))
 779                                 {
 780                                 al=SSL_AD_DECODE_ERROR;
 781                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
 782                                 goto f_err;
 783                                 }
 784
 785                         i=rr->data[0];
 786                         n=rr->data[1];
 787
 788                         /* clear from buffer */
 789                         rr->length=0;
 790
 791                         if (s->info_callback != NULL)
 792                                 cb=s->info_callback;
 793                         else if (s->ctx->info_callback != NULL)
 794                                 cb=s->ctx->info_callback;
 795
 796                         if (cb != NULL)
 797                                 {
 798                                 j=(i<<8)|n;
 799                                 cb(s,SSL_CB_READ_ALERT,j);
 800                                 }
 801
 802                         if (i == 1)
 803                                 {
 804                                 s->s3->warn_alert=n;
 805                                 if (n == SSL_AD_CLOSE_NOTIFY)
 806                                         {
 807                                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 808                                         return(0);
 809                                         }
 810                                 }
 811                         else if (i == 2)
 812                                 {
 813                                 char tmp[16];
 814
 815                                 s->rwstate=SSL_NOTHING;
 816                                 s->s3->fatal_alert=n;
 817                                 SSLerr(SSL_F_SSL3_READ_BYTES,
 818                                         SSL_AD_REASON_OFFSET+n);
 819                                 sprintf(tmp,"%d",n);
 820                                 ERR_add_error_data(2,"SSL alert number ",tmp);
 821                                 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 822                                 SSL_CTX_remove_session(s->ctx,s->session);
 823                                 return(0);
 824                                 }
 825                         else
 826                                 {
 827                                 al=SSL_AD_ILLEGAL_PARAMETER;
 828                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
 829                                 goto f_err;
 830                                 }
 831
 832                         rr->length=0;
 833                         goto start;
 834                         }
 835
 836                 if (s->shutdown & SSL_SENT_SHUTDOWN)
 837                         {
 838                         s->rwstate=SSL_NOTHING;
 839                         rr->length=0;
 840                         return(0);
 841                         }
 842
 843                 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
 844                         {
 845                         if (    (rr->length != 1) || (rr->off != 0) ||
 846                                 (rr->data[0] != SSL3_MT_CCS))
 847                                 {
 848                                 i=SSL_AD_ILLEGAL_PARAMETER;
 849                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
 850                                 goto err;
 851                                 }
 852
 853                         rr->length=0;
 854                         s->s3->change_cipher_spec=1;
 855                         if (!do_change_cipher_spec(s))
 856                                 goto err;
 857                         else
 858                                 goto start;
 859                         }
 860
 861                 /* else we have a handshake */
 862                 if ((rr->type == SSL3_RT_HANDSHAKE) &&
 863                         !s->in_handshake)
 864                         {
 865                         if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
 866                                 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
 867                                 {
 868                                 s->state=SSL_ST_BEFORE|(s->server)
 869                                                 ?SSL_ST_ACCEPT
 870                                                 :SSL_ST_CONNECT;
 871                                 s->new_session=1;
 872                                 }
 873                         n=s->handshake_func(s);
 874                         if (n < 0) return(n);
 875                         if (n == 0)
 876                                 {
 877                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 878                                 return(-1);
 879                                 }
 880
 881                         /* In the case where we try to read application data
 882                          * the first time, but we trigger an SSL handshake, we
 883                          * return -1 with the retry option set.  I do this
 884                          * otherwise renegotiation can cause nasty problems
 885                          * in the non-blocking world */
 886
 887                         s->rwstate=SSL_READING;
 888                         bio=SSL_get_rbio(s);
 889                         BIO_clear_retry_flags(bio);
 890                         BIO_set_retry_read(bio);
 891                         return(-1);
 892                         }
 893
 894                 switch (rr->type)
 895                         {
 896                 default:
 897 #ifndef NO_TLS
 898                         /* TLS just ignores unknown message types */
 899                         if (s->version == TLS1_VERSION)
 900                                 {
 901                                 goto start;
 902                                 }
 903 #endif
 904                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 905                 case SSL3_RT_ALERT:
 906                 case SSL3_RT_HANDSHAKE:
 907                         al=SSL_AD_UNEXPECTED_MESSAGE;
 908                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 909                         goto f_err;
 910                 case SSL3_RT_APPLICATION_DATA:
 911                         /* At this point, we were expecting something else,
 912                          * but have application data.  What we do is set the
 913                          * error, and return -1.  On the way out, if the
 914                          * library was running inside ssl3_read() and it makes
 915                          * sense to read application data at this point, we
 916                          * will indulge it.  This will mostly happen during
 917                          * session renegotiation.
 918                          */
 919                         if (s->s3->in_read_app_data &&
 920                                 (s->s3->total_renegotiations != 0) &&
 921                                 ((
 922                                   (s->state & SSL_ST_CONNECT) &&
 923                                   (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
 924                                   (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
 925                                  ) || (
 926                                   (s->state & SSL_ST_ACCEPT) &&
 927                                   (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
 928                                   (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
 929                                  )
 930                                 ))
 931                                 {
 932                                 s->s3->in_read_app_data=0;
 933                                 return(-1);
 934                                 }
 935                         else
 936                                 {
 937                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 938                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 939                                 goto f_err;
 940                                 }
 941                         }
 942                 }
 943
 944         /* make sure that we are not getting application data when we
 945          * are doing a handshake for the first time */
 946         if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 947                 (s->enc_read_ctx == NULL))
 948                 {
 949                 al=SSL_AD_UNEXPECTED_MESSAGE;
 950                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 951                 goto f_err;
 952                 }
 953
 954         if (len <= 0) return(len);
 955
 956         if ((unsigned int)len > rr->length)
 957                 n=rr->length;
 958         else
 959                 n=len;
 960
 961         memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
 962         rr->length-=n;
 963         rr->off+=n;
 964         if (rr->length <= 0)
 965                 {
 966                 s->rstate=SSL_ST_READ_HEADER;
 967                 rr->off=0;
 968                 }
 969
 970         if (type == SSL3_RT_HANDSHAKE)
 971                 ssl3_finish_mac(s,buf,n);
 972         return(n);
 973 f_err:
 974         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 975 err:
 976         return(-1);
 977         }
 978
 979 static int do_change_cipher_spec(SSL *s)
 980         {
 981         int i;
 982         const char *sender;
 983         int slen;
 984
 985         if (s->state & SSL_ST_ACCEPT)
 986                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
 987         else
 988                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
 989
 990         if (s->s3->tmp.key_block == NULL)
 991                 {
 992                 s->session->cipher=s->s3->tmp.new_cipher;
 993                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
 994                 }
 995
 996         if (!s->method->ssl3_enc->change_cipher_state(s,i))
 997                 return(0);
 998
 999         /* we have to record the message digest at
1000          * this point so we can get it before we read
1001          * the finished message */
1002         if (s->state & SSL_ST_CONNECT)
1003                 {
1004                 sender=s->method->ssl3_enc->server_finished_label;
1005                 slen=s->method->ssl3_enc->server_finished_label_len;
1006                 }
1007         else
1008                 {
1009                 sender=s->method->ssl3_enc->client_finished_label;
1010                 slen=s->method->ssl3_enc->client_finished_label_len;
1011                 }
1012
1013         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1014                 &(s->s3->finish_dgst1),
1015                 &(s->s3->finish_dgst2),
1016                 sender,slen,s->s3->tmp.peer_finish_md);
1017
1018         return(1);
1019         }
1020
1021 int ssl3_do_write(SSL *s, int type)
1022         {
1023         int ret;
1024
1025         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
1026                              s->init_num);
1027         if (ret == s->init_num)
1028                 return(1);
1029         if (ret < 0) return(-1);
1030         s->init_off+=ret;
1031         s->init_num-=ret;
1032         return(0);
1033         }
1034
1035 void ssl3_send_alert(SSL *s, int level, int desc)
1036         {
1037         /* Map tls/ssl alert value to correct one */
1038         desc=s->method->ssl3_enc->alert_value(desc);
1039         if (desc < 0) return;
1040         /* If a fatal one, remove from cache */
1041         if ((level == 2) && (s->session != NULL))
1042                 SSL_CTX_remove_session(s->ctx,s->session);
1043
1044         s->s3->alert_dispatch=1;
1045         s->s3->send_alert[0]=level;
1046         s->s3->send_alert[1]=desc;
1047         if (s->s3->wbuf.left == 0) /* data still being written out */
1048                 ssl3_dispatch_alert(s);
1049         /* else data is still being written out, we will get written
1050          * some time in the future */
1051         }
1052
1053 int ssl3_dispatch_alert(SSL *s)
1054         {
1055         int i,j;
1056         void (*cb)()=NULL;
1057
1058         s->s3->alert_dispatch=0;
1059         i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1060         if (i <= 0)
1061                 {
1062                 s->s3->alert_dispatch=1;
1063                 }
1064         else
1065                 {
1066                 /* If it is important, send it now.  If the message
1067                  * does not get sent due to non-blocking IO, we will
1068                  * not worry too much. */
1069                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1070                         (void)BIO_flush(s->wbio);
1071
1072                 if (s->info_callback != NULL)
1073                         cb=s->info_callback;
1074                 else if (s->ctx->info_callback != NULL)
1075                         cb=s->ctx->info_callback;
1076
1077                 if (cb != NULL)
1078                         {
1079                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1080                         cb(s,SSL_CB_WRITE_ALERT,j);
1081                         }
1082                 }
1083         return(i);
1084         }