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