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         s->rwstate=SSL_NOTHING;
 218         return(n);
 219         }
 220
 221 /* Call this to get a new input record.
 222  * It will return <= 0 if more data is needed, normally due to an error
 223  * or non-blocking IO.
 224  * When it finishes, one packet has been decoded and can be found in
 225  * ssl->s3->rrec.type    - is the type of record
 226  * ssl->s3->rrec.data,   - data
 227  * ssl->s3->rrec.length, - number of bytes
 228  */
 229 static int ssl3_get_record(SSL *s)
 230         {
 231         int ssl_major,ssl_minor,al;
 232         int n,i,ret= -1;
 233         SSL3_BUFFER *rb;
 234         SSL3_RECORD *rr;
 235         SSL_SESSION *sess;
 236         unsigned char *p;
 237         unsigned char md[EVP_MAX_MD_SIZE];
 238         short version;
 239         unsigned int mac_size;
 240         int clear=0,extra;
 241
 242         rr= &(s->s3->rrec);
 243         rb= &(s->s3->rbuf);
 244         sess=s->session;
 245
 246         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 247                 extra=SSL3_RT_MAX_EXTRA;
 248         else
 249                 extra=0;
 250
 251 again:
 252         /* check if we have the header */
 253         if (    (s->rstate != SSL_ST_READ_BODY) ||
 254                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 255                 {
 256                 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
 257                         SSL3_RT_MAX_PACKET_SIZE,0);
 258                 if (n <= 0) return(n); /* error or non-blocking */
 259                 s->rstate=SSL_ST_READ_BODY;
 260
 261                 p=s->packet;
 262
 263                 /* Pull apart the header into the SSL3_RECORD */
 264                 rr->type= *(p++);
 265                 ssl_major= *(p++);
 266                 ssl_minor= *(p++);
 267                 version=(ssl_major<<8)|ssl_minor;
 268                 n2s(p,rr->length);
 269
 270                 /* Lets check version */
 271                 if (s->first_packet)
 272                         {
 273                         s->first_packet=0;
 274                         }
 275                 else
 276                         {
 277                         if (version != s->version)
 278                                 {
 279                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 280                                 /* Send back error using their
 281                                  * version number :-) */
 282                                 s->version=version;
 283                                 al=SSL_AD_PROTOCOL_VERSION;
 284                                 goto f_err;
 285                                 }
 286                         }
 287
 288                 if ((version>>8) != SSL3_VERSION_MAJOR)
 289                         {
 290                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 291                         goto err;
 292                         }
 293
 294                 if (rr->length >
 295                         (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 296                         {
 297                         al=SSL_AD_RECORD_OVERFLOW;
 298                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 299                         goto f_err;
 300                         }
 301
 302                 /* now s->rstate == SSL_ST_READ_BODY; */
 303                 }
 304
 305         /* get and decode the data */
 306         if (s->rstate == SSL_ST_READ_BODY)
 307                 {
 308                 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
 309                         {
 310                         i=rr->length;
 311                         n=ssl3_read_n(s,i,i,1);
 312                         if (n <= 0) return(n); /* error or non-blocking io */
 313                         }
 314                 s->rstate=SSL_ST_READ_HEADER;
 315                 }
 316
 317         /* At this point, we have the data in s->packet and there should be
 318          * s->packet_length bytes, we must not 'overrun' this buffer :-)
 319          * One of the following functions will copy the data from the
 320          * s->packet buffer */
 321
 322         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 323
 324         /* ok, we can now read from 's->packet' data into 'rr'
 325          * rr->input points at rr->length bytes, which
 326          * need to be copied into rr->data by either
 327          * the decryption or by the decompression
 328          * When the data is 'copied' into the rr->data buffer,
 329          * rr->input will be pointed at the new buffer */
 330
 331         /* Set the state for the following operations */
 332         s->rstate=SSL_ST_READ_HEADER;
 333
 334         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 335          * rr->length bytes of encrypted compressed stuff. */
 336
 337         /* check is not needed I belive */
 338         if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 339                 {
 340                 al=SSL_AD_RECORD_OVERFLOW;
 341                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 342                 goto f_err;
 343                 }
 344
 345         /* decrypt in place in 'rr->input' */
 346         rr->data=rr->input;
 347
 348         if (!s->method->ssl3_enc->enc(s,0))
 349                 {
 350                 al=SSL_AD_DECRYPT_ERROR;
 351                 goto f_err;
 352                 }
 353 #ifdef TLS_DEBUG
 354 printf("dec %d\n",rr->length);
 355 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 356 printf("\n");
 357 #endif
 358         /* r->length is now the compressed data plus mac */
 359         if (    (sess == NULL) ||
 360                 (s->enc_read_ctx == NULL) ||
 361                 (s->read_hash == NULL))
 362                 clear=1;
 363
 364         if (!clear)
 365                 {
 366                 mac_size=EVP_MD_size(s->read_hash);
 367
 368                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 369                         {
 370                         al=SSL_AD_RECORD_OVERFLOW;
 371                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 372                         goto f_err;
 373                         }
 374                 /* check MAC for rr->input' */
 375                 if (rr->length < mac_size)
 376                         {
 377                         al=SSL_AD_DECODE_ERROR;
 378                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 379                         goto f_err;
 380                         }
 381                 rr->length-=mac_size;
 382                 i=s->method->ssl3_enc->mac(s,md,0);
 383                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 384                         {
 385                         al=SSL_AD_BAD_RECORD_MAC;
 386                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
 387                         ret= -1;
 388                         goto f_err;
 389                         }
 390                 }
 391
 392         /* r->length is now just compressed */
 393         if (s->expand != NULL)
 394                 {
 395                 if (rr->length >
 396                         (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 397                         {
 398                         al=SSL_AD_RECORD_OVERFLOW;
 399                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 400                         goto f_err;
 401                         }
 402                 if (!do_uncompress(s))
 403                         {
 404                         al=SSL_AD_DECOMPRESSION_FAILURE;
 405                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 406                         goto f_err;
 407                         }
 408                 }
 409
 410         if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
 411                 {
 412                 al=SSL_AD_RECORD_OVERFLOW;
 413                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 414                 goto f_err;
 415                 }
 416
 417         rr->off=0;
 418         /* So at this point the following is true
 419          * ssl->s3->rrec.type   is the type of record
 420          * ssl->s3->rrec.length == number of bytes in record
 421          * ssl->s3->rrec.off    == offset to first valid byte
 422          * ssl->s3->rrec.data   == where to take bytes from, increment
 423          *                         after use :-).
 424          */
 425
 426         /* we have pulled in a full packet so zero things */
 427         s->packet_length=0;
 428
 429         /* just read a 0 length packet */
 430         if (rr->length == 0) goto again;
 431
 432         return(1);
 433 f_err:
 434         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 435 err:
 436         return(ret);
 437         }
 438
 439 static int do_uncompress(SSL *ssl)
 440         {
 441         int i;
 442         SSL3_RECORD *rr;
 443
 444         rr= &(ssl->s3->rrec);
 445         i=COMP_expand_block(ssl->expand,rr->comp,
 446                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 447         if (i < 0)
 448                 return(0);
 449         else
 450                 rr->length=i;
 451         rr->data=rr->comp;
 452
 453         return(1);
 454         }
 455
 456 static int do_compress(SSL *ssl)
 457         {
 458         int i;
 459         SSL3_RECORD *wr;
 460
 461         wr= &(ssl->s3->wrec);
 462         i=COMP_compress_block(ssl->compress,wr->data,
 463                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 464                 wr->input,(int)wr->length);
 465         if (i < 0)
 466                 return(0);
 467         else
 468                 wr->length=i;
 469
 470         wr->input=wr->data;
 471         return(1);
 472         }
 473
 474 /* Call this to write data
 475  * It will return <= 0 if not all data has been sent or non-blocking IO.
 476  */
 477 int ssl3_write_bytes(SSL *s, int type, const void *_buf, int len)
 478         {
 479         const unsigned char *buf=_buf;
 480         unsigned int tot,n,nw;
 481         int i;
 482
 483         s->rwstate=SSL_NOTHING;
 484         tot=s->s3->wnum;
 485         s->s3->wnum=0;
 486
 487         if (SSL_in_init(s) && !s->in_handshake)
 488                 {
 489                 i=s->handshake_func(s);
 490                 if (i < 0) return(i);
 491                 if (i == 0)
 492                         {
 493                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 494                         return(-1);
 495                         }
 496                 }
 497
 498         n=(len-tot);
 499         for (;;)
 500                 {
 501                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 502                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 503                 else
 504                         nw=n;
 505
 506                 i=do_ssl3_write(s,type,&(buf[tot]),nw);
 507                 if (i <= 0)
 508                         {
 509                         s->s3->wnum=tot;
 510                         return(i);
 511                         }
 512
 513                 if (type == SSL3_RT_HANDSHAKE)
 514                         ssl3_finish_mac(s,&(buf[tot]),i);
 515
 516                 if ((i == (int)n) ||
 517                         (type == SSL3_RT_APPLICATION_DATA &&
 518                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 519                         {
 520                         return(tot+i);
 521                         }
 522
 523                 n-=i;
 524                 tot+=i;
 525                 }
 526         }
 527
 528 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 529                          unsigned int len)
 530         {
 531         unsigned char *p,*plen;
 532         int i,mac_size,clear=0;
 533         SSL3_RECORD *wr;
 534         SSL3_BUFFER *wb;
 535         SSL_SESSION *sess;
 536
 537         /* first check is there is a SSL3_RECORD still being written
 538          * out.  This will happen with non blocking IO */
 539         if (s->s3->wbuf.left != 0)
 540                 return(ssl3_write_pending(s,type,buf,len));
 541
 542         /* If we have an alert to send, lets send it */
 543         if (s->s3->alert_dispatch)
 544                 {
 545                 i=ssl3_dispatch_alert(s);
 546                 if (i <= 0)
 547                         return(i);
 548                 /* if it went, fall through and send more stuff */
 549                 }
 550
 551         if (len == 0) return(len);
 552
 553         wr= &(s->s3->wrec);
 554         wb= &(s->s3->wbuf);
 555         sess=s->session;
 556
 557         if (    (sess == NULL) ||
 558                 (s->enc_write_ctx == NULL) ||
 559                 (s->write_hash == NULL))
 560                 clear=1;
 561
 562         if (clear)
 563                 mac_size=0;
 564         else
 565                 mac_size=EVP_MD_size(s->write_hash);
 566
 567         p=wb->buf;
 568
 569         /* write the header */
 570         *(p++)=type&0xff;
 571         wr->type=type;
 572
 573         *(p++)=(s->version>>8);
 574         *(p++)=s->version&0xff;
 575
 576         /* record where we are to write out packet length */
 577         plen=p;
 578         p+=2;
 579
 580         /* lets setup the record stuff. */
 581         wr->data=p;
 582         wr->length=(int)len;
 583         wr->input=(unsigned char *)buf;
 584
 585         /* we now 'read' from wr->input, wr->length bytes into
 586          * wr->data */
 587
 588         /* first we compress */
 589         if (s->compress != NULL)
 590                 {
 591                 if (!do_compress(s))
 592                         {
 593                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 594                         goto err;
 595                         }
 596                 }
 597         else
 598                 {
 599                 memcpy(wr->data,wr->input,wr->length);
 600                 wr->input=wr->data;
 601                 }
 602
 603         /* we should still have the output to wr->data and the input
 604          * from wr->input.  Length should be wr->length.
 605          * wr->data still points in the wb->buf */
 606
 607         if (mac_size != 0)
 608                 {
 609                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 610                 wr->length+=mac_size;
 611                 wr->input=p;
 612                 wr->data=p;
 613                 }
 614
 615         /* ssl3_enc can only have an error on read */
 616         s->method->ssl3_enc->enc(s,1);
 617
 618         /* record length after mac and block padding */
 619         s2n(wr->length,plen);
 620
 621         /* we should now have
 622          * wr->data pointing to the encrypted data, which is
 623          * wr->length long */
 624         wr->type=type; /* not needed but helps for debugging */
 625         wr->length+=SSL3_RT_HEADER_LENGTH;
 626
 627         /* Now lets setup wb */
 628         wb->left=wr->length;
 629         wb->offset=0;
 630
 631         s->s3->wpend_tot=len;
 632         s->s3->wpend_buf=buf;
 633         s->s3->wpend_type=type;
 634         s->s3->wpend_ret=len;
 635
 636         /* we now just need to write the buffer */
 637         return(ssl3_write_pending(s,type,buf,len));
 638 err:
 639         return(-1);
 640         }
 641
 642 /* if s->s3->wbuf.left != 0, we need to call this */
 643 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 644                               unsigned int len)
 645         {
 646         int i;
 647
 648 /* XXXX */
 649         if ((s->s3->wpend_tot > (int)len)
 650                 || ((s->s3->wpend_buf != buf) &&
 651                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 652                 || (s->s3->wpend_type != type))
 653                 {
 654                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 655                 return(-1);
 656                 }
 657
 658         for (;;)
 659                 {
 660                 clear_sys_error();
 661                 if (s->wbio != NULL)
 662                         {
 663                         s->rwstate=SSL_WRITING;
 664                         i=BIO_write(s->wbio,
 665                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 666                                 (unsigned int)s->s3->wbuf.left);
 667                         }
 668                 else
 669                         {
 670                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 671                         i= -1;
 672                         }
 673                 if (i == s->s3->wbuf.left)
 674                         {
 675                         s->s3->wbuf.left=0;
 676                         s->rwstate=SSL_NOTHING;
 677                         return(s->s3->wpend_ret);
 678                         }
 679                 else if (i <= 0)
 680                         return(i);
 681                 s->s3->wbuf.offset+=i;
 682                 s->s3->wbuf.left-=i;
 683                 }
 684         }
 685
 686 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len)
 687         {
 688         int al,i,j,n,ret;
 689         SSL3_RECORD *rr;
 690         void (*cb)()=NULL;
 691         BIO *bio;
 692
 693         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 694                 if (!ssl3_setup_buffers(s))
 695                         return(-1);
 696
 697         if (!s->in_handshake && SSL_in_init(s))
 698                 {
 699                 i=s->handshake_func(s);
 700                 if (i < 0) return(i);
 701                 if (i == 0)
 702                         {
 703                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 704                         return(-1);
 705                         }
 706                 }
 707 start:
 708         s->rwstate=SSL_NOTHING;
 709
 710         /* s->s3->rrec.type         - is the type of record
 711          * s->s3->rrec.data,    - data
 712          * s->s3->rrec.off,     - offset into 'data' for next read
 713          * s->s3->rrec.length,  - number of bytes. */
 714         rr= &(s->s3->rrec);
 715
 716         /* get new packet */
 717         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 718                 {
 719                 ret=ssl3_get_record(s);
 720                 if (ret <= 0) return(ret);
 721                 }
 722
 723         /* we now have a packet which can be read and processed */
 724
 725         if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
 726                 {
 727                 al=SSL_AD_UNEXPECTED_MESSAGE;
 728                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 729                 goto err;
 730                 }
 731
 732         /* If the other end has shutdown, throw anything we read away */
 733         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 734                 {
 735                 rr->length=0;
 736                 s->rwstate=SSL_NOTHING;
 737                 return(0);
 738                 }
 739
 740         /* Check for an incoming 'Hello Request' message from client */
 741         if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
 742                 (rr->data[0] == SSL3_MT_HELLO_REQUEST) &&
 743                 (s->session != NULL) && (s->session->cipher != NULL))
 744                 {
 745                 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
 746                         (rr->data[3] != 0))
 747                         {
 748                         al=SSL_AD_DECODE_ERROR;
 749                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
 750                         goto err;
 751                         }
 752
 753                 if (SSL_is_init_finished(s) &&
 754                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 755                         !s->s3->renegotiate)
 756                         {
 757                         ssl3_renegotiate(s);
 758                         if (ssl3_renegotiate_check(s))
 759                                 {
 760                                 n=s->handshake_func(s);
 761                                 if (n < 0) return(n);
 762                                 if (n == 0)
 763                                         {
 764                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 765                                         return(-1);
 766                                         }
 767                                 }
 768                         }
 769                 rr->length=0;
 770 /* ZZZ */       goto start;
 771                 }
 772
 773         /* if it is not the type we want, or we have shutdown and want
 774          * the peer shutdown */
 775         if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
 776                 {
 777                 if (rr->type == SSL3_RT_ALERT)
 778                         {
 779                         if ((rr->length != 2) || (rr->off != 0))
 780                                 {
 781                                 al=SSL_AD_DECODE_ERROR;
 782                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
 783                                 goto f_err;
 784                                 }
 785
 786                         i=rr->data[0];
 787                         n=rr->data[1];
 788
 789                         /* clear from buffer */
 790                         rr->length=0;
 791
 792                         if (s->info_callback != NULL)
 793                                 cb=s->info_callback;
 794                         else if (s->ctx->info_callback != NULL)
 795                                 cb=s->ctx->info_callback;
 796
 797                         if (cb != NULL)
 798                                 {
 799                                 j=(i<<8)|n;
 800                                 cb(s,SSL_CB_READ_ALERT,j);
 801                                 }
 802
 803                         if (i == 1)
 804                                 {
 805                                 s->s3->warn_alert=n;
 806                                 if (n == SSL_AD_CLOSE_NOTIFY)
 807                                         {
 808                                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 809                                         return(0);
 810                                         }
 811                                 }
 812                         else if (i == 2)
 813                                 {
 814                                 char tmp[16];
 815
 816                                 s->rwstate=SSL_NOTHING;
 817                                 s->s3->fatal_alert=n;
 818                                 SSLerr(SSL_F_SSL3_READ_BYTES,
 819                                         SSL_AD_REASON_OFFSET+n);
 820                                 sprintf(tmp,"%d",n);
 821                                 ERR_add_error_data(2,"SSL alert number ",tmp);
 822                                 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 823                                 SSL_CTX_remove_session(s->ctx,s->session);
 824                                 return(0);
 825                                 }
 826                         else
 827                                 {
 828                                 al=SSL_AD_ILLEGAL_PARAMETER;
 829                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
 830                                 goto f_err;
 831                                 }
 832
 833                         rr->length=0;
 834                         goto start;
 835                         }
 836
 837                 if (s->shutdown & SSL_SENT_SHUTDOWN)
 838                         {
 839                         s->rwstate=SSL_NOTHING;
 840                         rr->length=0;
 841                         return(0);
 842                         }
 843
 844                 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
 845                         {
 846                         if (    (rr->length != 1) || (rr->off != 0) ||
 847                                 (rr->data[0] != SSL3_MT_CCS))
 848                                 {
 849                                 i=SSL_AD_ILLEGAL_PARAMETER;
 850                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
 851                                 goto err;
 852                                 }
 853
 854                         rr->length=0;
 855                         s->s3->change_cipher_spec=1;
 856                         if (!do_change_cipher_spec(s))
 857                                 goto err;
 858                         else
 859                                 goto start;
 860                         }
 861
 862                 /* else we have a handshake */
 863                 if ((rr->type == SSL3_RT_HANDSHAKE) &&
 864                         !s->in_handshake)
 865                         {
 866                         if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
 867                                 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
 868                                 {
 869                                 s->state=SSL_ST_BEFORE|(s->server)
 870                                                 ?SSL_ST_ACCEPT
 871                                                 :SSL_ST_CONNECT;
 872                                 s->new_session=1;
 873                                 }
 874                         n=s->handshake_func(s);
 875                         if (n < 0) return(n);
 876                         if (n == 0)
 877                                 {
 878                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 879                                 return(-1);
 880                                 }
 881
 882                         /* In the case where we try to read application data
 883                          * the first time, but we trigger an SSL handshake, we
 884                          * return -1 with the retry option set.  I do this
 885                          * otherwise renegotiation can cause nasty problems
 886                          * in the non-blocking world */
 887
 888                         s->rwstate=SSL_READING;
 889                         bio=SSL_get_rbio(s);
 890                         BIO_clear_retry_flags(bio);
 891                         BIO_set_retry_read(bio);
 892                         return(-1);
 893                         }
 894
 895                 switch (rr->type)
 896                         {
 897                 default:
 898 #ifndef NO_TLS
 899                         /* TLS just ignores unknown message types */
 900                         if (s->version == TLS1_VERSION)
 901                                 {
 902                                 goto start;
 903                                 }
 904 #endif
 905                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 906                 case SSL3_RT_ALERT:
 907                 case SSL3_RT_HANDSHAKE:
 908                         al=SSL_AD_UNEXPECTED_MESSAGE;
 909                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 910                         goto f_err;
 911                 case SSL3_RT_APPLICATION_DATA:
 912                         /* At this point, we were expecting something else,
 913                          * but have application data.  What we do is set the
 914                          * error, and return -1.  On the way out, if the
 915                          * library was running inside ssl3_read() and it makes
 916                          * sense to read application data at this point, we
 917                          * will indulge it.  This will mostly happen during
 918                          * session renegotiation.
 919                          */
 920                         if (s->s3->in_read_app_data &&
 921                                 (s->s3->total_renegotiations != 0) &&
 922                                 ((
 923                                   (s->state & SSL_ST_CONNECT) &&
 924                                   (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
 925                                   (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
 926                                  ) || (
 927                                   (s->state & SSL_ST_ACCEPT) &&
 928                                   (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
 929                                   (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
 930                                  )
 931                                 ))
 932                                 {
 933                                 s->s3->in_read_app_data=0;
 934                                 return(-1);
 935                                 }
 936                         else
 937                                 {
 938                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 939                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 940                                 goto f_err;
 941                                 }
 942                         }
 943                 }
 944
 945         /* make sure that we are not getting application data when we
 946          * are doing a handshake for the first time */
 947         if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 948                 (s->enc_read_ctx == NULL))
 949                 {
 950                 al=SSL_AD_UNEXPECTED_MESSAGE;
 951                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 952                 goto f_err;
 953                 }
 954
 955         if (len <= 0) return(len);
 956
 957         if ((unsigned int)len > rr->length)
 958                 n=rr->length;
 959         else
 960                 n=len;
 961
 962         memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
 963         rr->length-=n;
 964         rr->off+=n;
 965         if (rr->length == 0)
 966                 {
 967                 s->rstate=SSL_ST_READ_HEADER;
 968                 rr->off=0;
 969                 }
 970
 971         if (type == SSL3_RT_HANDSHAKE)
 972                 ssl3_finish_mac(s,buf,n);
 973         return(n);
 974 f_err:
 975         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 976 err:
 977         return(-1);
 978         }
 979
 980 static int do_change_cipher_spec(SSL *s)
 981         {
 982         int i;
 983         const char *sender;
 984         int slen;
 985
 986         if (s->state & SSL_ST_ACCEPT)
 987                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
 988         else
 989                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
 990
 991         if (s->s3->tmp.key_block == NULL)
 992                 {
 993                 s->session->cipher=s->s3->tmp.new_cipher;
 994                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
 995                 }
 996
 997         if (!s->method->ssl3_enc->change_cipher_state(s,i))
 998                 return(0);
 999
1000         /* we have to record the message digest at
1001          * this point so we can get it before we read
1002          * the finished message */
1003         if (s->state & SSL_ST_CONNECT)
1004                 {
1005                 sender=s->method->ssl3_enc->server_finished_label;
1006                 slen=s->method->ssl3_enc->server_finished_label_len;
1007                 }
1008         else
1009                 {
1010                 sender=s->method->ssl3_enc->client_finished_label;
1011                 slen=s->method->ssl3_enc->client_finished_label_len;
1012                 }
1013
1014         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1015                 &(s->s3->finish_dgst1),
1016                 &(s->s3->finish_dgst2),
1017                 sender,slen,s->s3->tmp.peer_finish_md);
1018
1019         return(1);
1020         }
1021
1022 int ssl3_do_write(SSL *s, int type)
1023         {
1024         int ret;
1025
1026         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
1027                              s->init_num);
1028         if (ret == s->init_num)
1029                 return(1);
1030         if (ret < 0) return(-1);
1031         s->init_off+=ret;
1032         s->init_num-=ret;
1033         return(0);
1034         }
1035
1036 void ssl3_send_alert(SSL *s, int level, int desc)
1037         {
1038         /* Map tls/ssl alert value to correct one */
1039         desc=s->method->ssl3_enc->alert_value(desc);
1040         if (desc < 0) return;
1041         /* If a fatal one, remove from cache */
1042         if ((level == 2) && (s->session != NULL))
1043                 SSL_CTX_remove_session(s->ctx,s->session);
1044
1045         s->s3->alert_dispatch=1;
1046         s->s3->send_alert[0]=level;
1047         s->s3->send_alert[1]=desc;
1048         if (s->s3->wbuf.left == 0) /* data still being written out */
1049                 ssl3_dispatch_alert(s);
1050         /* else data is still being written out, we will get written
1051          * some time in the future */
1052         }
1053
1054 int ssl3_dispatch_alert(SSL *s)
1055         {
1056         int i,j;
1057         void (*cb)()=NULL;
1058
1059         s->s3->alert_dispatch=0;
1060         i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1061         if (i <= 0)
1062                 {
1063                 s->s3->alert_dispatch=1;
1064                 }
1065         else
1066                 {
1067                 /* If it is important, send it now.  If the message
1068                  * does not get sent due to non-blocking IO, we will
1069                  * not worry too much. */
1070                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1071                         (void)BIO_flush(s->wbio);
1072
1073                 if (s->info_callback != NULL)
1074                         cb=s->info_callback;
1075                 else if (s->ctx->info_callback != NULL)
1076                         cb=s->ctx->info_callback;
1077
1078                 if (cb != NULL)
1079                         {
1080                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1081                         cb(s,SSL_CB_WRITE_ALERT,j);
1082                         }
1083                 }
1084         return(i);
1085         }