ssl/s2_pkt.c

   1 /* ssl/s2_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) 1998-2001 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 "ssl_locl.h"
 113 #ifndef OPENSSL_NO_SSL2
 114 #include <stdio.h>
 115 #include <errno.h>
 116 #define USE_SOCKETS
 117
 118 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
 119 static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
 120 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
 121 static int ssl_mt_error(int n);
 122
 123
 124 /* SSL 2.0 imlementation for SSL_read/SSL_peek -
 125  * This routine will return 0 to len bytes, decrypted etc if required.
 126  */
 127 static int ssl2_read_internal(SSL *s, void *buf, int len, int peek)
 128         {
 129         int n;
 130         unsigned char mac[MAX_MAC_SIZE];
 131         unsigned char *p;
 132         int i;
 133         int mac_size;
 134
 135  ssl2_read_again:
 136         if (SSL_in_init(s) && !s->in_handshake)
 137                 {
 138                 n=s->handshake_func(s);
 139                 if (n < 0) return(n);
 140                 if (n == 0)
 141                         {
 142                         SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE);
 143                         return(-1);
 144                         }
 145                 }
 146
 147         clear_sys_error();
 148         s->rwstate=SSL_NOTHING;
 149         if (len <= 0) return(len);
 150
 151         if (s->s2->ract_data_length != 0) /* read from buffer */
 152                 {
 153                 if (len > s->s2->ract_data_length)
 154                         n=s->s2->ract_data_length;
 155                 else
 156                         n=len;
 157
 158                 memcpy(buf,s->s2->ract_data,(unsigned int)n);
 159                 if (!peek)
 160                         {
 161                         s->s2->ract_data_length-=n;
 162                         s->s2->ract_data+=n;
 163                         if (s->s2->ract_data_length == 0)
 164                                 s->rstate=SSL_ST_READ_HEADER;
 165                         }
 166
 167                 return(n);
 168                 }
 169
 170         /* s->s2->ract_data_length == 0
 171          *
 172          * Fill the buffer, then goto ssl2_read_again.
 173          */
 174
 175         if (s->rstate == SSL_ST_READ_HEADER)
 176                 {
 177                 if (s->first_packet)
 178                         {
 179                         n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 180                         if (n <= 0) return(n); /* error or non-blocking */
 181                         s->first_packet=0;
 182                         p=s->packet;
 183                         if (!((p[0] & 0x80) && (
 184                                 (p[2] == SSL2_MT_CLIENT_HELLO) ||
 185                                 (p[2] == SSL2_MT_SERVER_HELLO))))
 186                                 {
 187                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET);
 188                                 return(-1);
 189                                 }
 190                         }
 191                 else
 192                         {
 193                         n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 194                         if (n <= 0) return(n); /* error or non-blocking */
 195                         }
 196                 /* part read stuff */
 197
 198                 s->rstate=SSL_ST_READ_BODY;
 199                 p=s->packet;
 200                 /* Do header */
 201                 /*s->s2->padding=0;*/
 202                 s->s2->escape=0;
 203                 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
 204                 if ((p[0] & TWO_BYTE_BIT))              /* Two byte header? */
 205                         {
 206                         s->s2->three_byte_header=0;
 207                         s->s2->rlength&=TWO_BYTE_MASK;
 208                         }
 209                 else
 210                         {
 211                         s->s2->three_byte_header=1;
 212                         s->s2->rlength&=THREE_BYTE_MASK;
 213
 214                         /* security >s2->escape */
 215                         s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
 216                         }
 217                 }
 218
 219         if (s->rstate == SSL_ST_READ_BODY)
 220                 {
 221                 n=s->s2->rlength+2+s->s2->three_byte_header;
 222                 if (n > (int)s->packet_length)
 223                         {
 224                         n-=s->packet_length;
 225                         i=read_n(s,(unsigned int)n,(unsigned int)n,1);
 226                         if (i <= 0) return(i); /* ERROR */
 227                         }
 228
 229                 p= &(s->packet[2]);
 230                 s->rstate=SSL_ST_READ_HEADER;
 231                 if (s->s2->three_byte_header)
 232                         s->s2->padding= *(p++);
 233                 else    s->s2->padding=0;
 234
 235                 /* Data portion */
 236                 if (s->s2->clear_text)
 237                         {
 238                         mac_size = 0;
 239                         s->s2->mac_data=p;
 240                         s->s2->ract_data=p;
 241                         if (s->s2->padding)
 242                                 {
 243                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
 244                                 return(-1);
 245                                 }
 246                         }
 247                 else
 248                         {
 249                         mac_size=EVP_MD_CTX_size(s->read_hash);
 250                         if (mac_size < 0)
 251                                 return -1;
 252                         OPENSSL_assert(mac_size <= MAX_MAC_SIZE);
 253                         s->s2->mac_data=p;
 254                         s->s2->ract_data= &p[mac_size];
 255                         if (s->s2->padding + mac_size > s->s2->rlength)
 256                                 {
 257                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
 258                                 return(-1);
 259                                 }
 260                         }
 261
 262                 s->s2->ract_data_length=s->s2->rlength;
 263                 /* added a check for length > max_size in case
 264                  * encryption was not turned on yet due to an error */
 265                 if ((!s->s2->clear_text) &&
 266                         (s->s2->rlength >= (unsigned int)mac_size))
 267                         {
 268                         if(!ssl2_enc(s,0))
 269                                 {
 270                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_DECRYPTION_FAILED);
 271                                 return(-1);
 272                                 }
 273                         s->s2->ract_data_length-=mac_size;
 274                         ssl2_mac(s,mac,0);
 275                         s->s2->ract_data_length-=s->s2->padding;
 276                         if (    (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) ||
 277                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
 278                                 {
 279                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
 280                                 return(-1);
 281                                 }
 282                         }
 283                 INC32(s->s2->read_sequence); /* expect next number */
 284                 /* s->s2->ract_data is now available for processing */
 285
 286                 /* Possibly the packet that we just read had 0 actual data bytes.
 287                  * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
 288                  * In this case, returning 0 would be interpreted by the caller
 289                  * as indicating EOF, so it's not a good idea.  Instead, we just
 290                  * continue reading; thus ssl2_read_internal may have to process
 291                  * multiple packets before it can return.
 292                  *
 293                  * [Note that using select() for blocking sockets *never* guarantees
 294                  * that the next SSL_read will not block -- the available
 295                  * data may contain incomplete packets, and except for SSL 2,
 296                  * renegotiation can confuse things even more.] */
 297
 298                 goto ssl2_read_again; /* This should really be
 299                                        * "return ssl2_read(s,buf,len)",
 300                                        * but that would allow for
 301                                        * denial-of-service attacks if a
 302                                        * C compiler is used that does not
 303                                        * recognize end-recursion. */
 304                 }
 305         else
 306                 {
 307                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
 308                         return(-1);
 309                 }
 310         }
 311
 312 int ssl2_read(SSL *s, void *buf, int len)
 313         {
 314         return ssl2_read_internal(s, buf, len, 0);
 315         }
 316
 317 int ssl2_peek(SSL *s, void *buf, int len)
 318         {
 319         return ssl2_read_internal(s, buf, len, 1);
 320         }
 321
 322 static int read_n(SSL *s, unsigned int n, unsigned int max,
 323              unsigned int extend)
 324         {
 325         int i,off,newb;
 326
 327         /* if there is stuff still in the buffer from a previous read,
 328          * and there is more than we want, take some. */
 329         if (s->s2->rbuf_left >= (int)n)
 330                 {
 331                 if (extend)
 332                         s->packet_length+=n;
 333                 else
 334                         {
 335                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
 336                         s->packet_length=n;
 337                         }
 338                 s->s2->rbuf_left-=n;
 339                 s->s2->rbuf_offs+=n;
 340                 return(n);
 341                 }
 342
 343         if (!s->read_ahead) max=n;
 344         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
 345                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
 346
 347
 348         /* Else we want more than we have.
 349          * First, if there is some left or we want to extend */
 350         off=0;
 351         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
 352                 {
 353                 newb=s->s2->rbuf_left;
 354                 if (extend)
 355                         {
 356                         off=s->packet_length;
 357                         if (s->packet != s->s2->rbuf)
 358                                 memcpy(s->s2->rbuf,s->packet,
 359                                         (unsigned int)newb+off);
 360                         }
 361                 else if (s->s2->rbuf_offs != 0)
 362                         {
 363                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
 364                                 (unsigned int)newb);
 365                         s->s2->rbuf_offs=0;
 366                         }
 367                 s->s2->rbuf_left=0;
 368                 }
 369         else
 370                 newb=0;
 371
 372         /* off is the offset to start writing too.
 373          * r->s2->rbuf_offs is the 'unread data', now 0.
 374          * newb is the number of new bytes so far
 375          */
 376         s->packet=s->s2->rbuf;
 377         while (newb < (int)n)
 378                 {
 379                 clear_sys_error();
 380                 if (s->rbio != NULL)
 381                         {
 382                         s->rwstate=SSL_READING;
 383                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
 384                                 max-newb);
 385                         }
 386                 else
 387                         {
 388                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
 389                         i= -1;
 390                         }
 391 #ifdef PKT_DEBUG
 392                 if (s->debug & 0x01) sleep(1);
 393 #endif
 394                 if (i <= 0)
 395                         {
 396                         s->s2->rbuf_left+=newb;
 397                         return(i);
 398                         }
 399                 newb+=i;
 400                 }
 401
 402         /* record unread data */
 403         if (newb > (int)n)
 404                 {
 405                 s->s2->rbuf_offs=n+off;
 406                 s->s2->rbuf_left=newb-n;
 407                 }
 408         else
 409                 {
 410                 s->s2->rbuf_offs=0;
 411                 s->s2->rbuf_left=0;
 412                 }
 413         if (extend)
 414                 s->packet_length+=n;
 415         else
 416                 s->packet_length=n;
 417         s->rwstate=SSL_NOTHING;
 418         return(n);
 419         }
 420
 421 int ssl2_write(SSL *s, const void *_buf, int len)
 422         {
 423         const unsigned char *buf=_buf;
 424         unsigned int n,tot;
 425         int i;
 426
 427         if (SSL_in_init(s) && !s->in_handshake)
 428                 {
 429                 i=s->handshake_func(s);
 430                 if (i < 0) return(i);
 431                 if (i == 0)
 432                         {
 433                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
 434                         return(-1);
 435                         }
 436                 }
 437
 438         if (s->error)
 439                 {
 440                 ssl2_write_error(s);
 441                 if (s->error)
 442                         return(-1);
 443                 }
 444
 445         clear_sys_error();
 446         s->rwstate=SSL_NOTHING;
 447         if (len <= 0) return(len);
 448
 449         tot=s->s2->wnum;
 450         s->s2->wnum=0;
 451
 452         n=(len-tot);
 453         for (;;)
 454                 {
 455                 i=n_do_ssl_write(s,&(buf[tot]),n);
 456                 if (i <= 0)
 457                         {
 458                         s->s2->wnum=tot;
 459                         return(i);
 460                         }
 461                 if ((i == (int)n) ||
 462                         (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
 463                         {
 464                         return(tot+i);
 465                         }
 466
 467                 n-=i;
 468                 tot+=i;
 469                 }
 470         }
 471
 472 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
 473         {
 474         int i;
 475
 476         /* s->s2->wpend_len != 0 MUST be true. */
 477
 478         /* check that they have given us the same buffer to
 479          * write */
 480         if ((s->s2->wpend_tot > (int)len) ||
 481                 ((s->s2->wpend_buf != buf) &&
 482                  !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
 483                 {
 484                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 485                 return(-1);
 486                 }
 487
 488         for (;;)
 489                 {
 490                 clear_sys_error();
 491                 if (s->wbio != NULL)
 492                         {
 493                         s->rwstate=SSL_WRITING;
 494                         i=BIO_write(s->wbio,
 495                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
 496                                 (unsigned int)s->s2->wpend_len);
 497                         }
 498                 else
 499                         {
 500                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
 501                         i= -1;
 502                         }
 503 #ifdef PKT_DEBUG
 504                 if (s->debug & 0x01) sleep(1);
 505 #endif
 506                 if (i == s->s2->wpend_len)
 507                         {
 508                         s->s2->wpend_len=0;
 509                         s->rwstate=SSL_NOTHING;
 510                         return(s->s2->wpend_ret);
 511                         }
 512                 else if (i <= 0)
 513                         return(i);
 514                 s->s2->wpend_off+=i;
 515                 s->s2->wpend_len-=i;
 516                 }
 517         }
 518
 519 static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
 520         {
 521         unsigned int j,k,olen,p,bs;
 522         int mac_size;
 523         register unsigned char *pp;
 524
 525         olen=len;
 526
 527         /* first check if there is data from an encryption waiting to
 528          * be sent - it must be sent because the other end is waiting.
 529          * This will happen with non-blocking IO.  We print it and then
 530          * return.
 531          */
 532         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
 533
 534         /* set mac_size to mac size */
 535         if (s->s2->clear_text)
 536                 mac_size=0;
 537         else
 538                 {
 539                 mac_size=EVP_MD_CTX_size(s->write_hash);
 540                 if (mac_size < 0)
 541                         return -1;
 542                 }
 543
 544         /* lets set the pad p */
 545         if (s->s2->clear_text)
 546                 {
 547                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 548                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 549                 p=0;
 550                 s->s2->three_byte_header=0;
 551                 /* len=len; */
 552                 }
 553         else
 554                 {
 555                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
 556                 j=len+mac_size;
 557                 /* Two-byte headers allow for a larger record length than
 558                  * three-byte headers, but we can't use them if we need
 559                  * padding or if we have to set the escape bit. */
 560                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
 561                         (!s->s2->escape))
 562                         {
 563                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 564                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 565                         /* set k to the max number of bytes with 2
 566                          * byte header */
 567                         k=j-(j%bs);
 568                         /* how many data bytes? */
 569                         len=k-mac_size;
 570                         s->s2->three_byte_header=0;
 571                         p=0;
 572                         }
 573                 else if ((bs <= 1) && (!s->s2->escape))
 574                         {
 575                         /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
 576                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
 577                         s->s2->three_byte_header=0;
 578                         p=0;
 579                         }
 580                 else /* we may have to use a 3 byte header */
 581                         {
 582                         /* If s->s2->escape is not set, then
 583                          * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
 584                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
 585                         p=(j%bs);
 586                         p=(p == 0)?0:(bs-p);
 587                         if (s->s2->escape)
 588                                 {
 589                                 s->s2->three_byte_header=1;
 590                                 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 591                                         j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
 592                                 }
 593                         else
 594                                 s->s2->three_byte_header=(p == 0)?0:1;
 595                         }
 596                 }
 597
 598         /* Now
 599          *      j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
 600          * holds, and if s->s2->three_byte_header is set, then even
 601          *      j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
 602          */
 603
 604         /* mac_size is the number of MAC bytes
 605          * len is the number of data bytes we are going to send
 606          * p is the number of padding bytes
 607          * (if it is a two-byte header, then p == 0) */
 608
 609         s->s2->wlength=len;
 610         s->s2->padding=p;
 611         s->s2->mac_data= &(s->s2->wbuf[3]);
 612         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
 613         /* we copy the data into s->s2->wbuf */
 614         memcpy(s->s2->wact_data,buf,len);
 615         if (p)
 616                 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
 617
 618         if (!s->s2->clear_text)
 619                 {
 620                 s->s2->wact_data_length=len+p;
 621                 ssl2_mac(s,s->s2->mac_data,1);
 622                 s->s2->wlength+=p+mac_size;
 623                 if(ssl2_enc(s,1) < 1)
 624                         return -1;
 625                 }
 626
 627         /* package up the header */
 628         s->s2->wpend_len=s->s2->wlength;
 629         if (s->s2->three_byte_header) /* 3 byte header */
 630                 {
 631                 pp=s->s2->mac_data;
 632                 pp-=3;
 633                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
 634                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
 635                 pp[1]=s->s2->wlength&0xff;
 636                 pp[2]=s->s2->padding;
 637                 s->s2->wpend_len+=3;
 638                 }
 639         else
 640                 {
 641                 pp=s->s2->mac_data;
 642                 pp-=2;
 643                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
 644                 pp[1]=s->s2->wlength&0xff;
 645                 s->s2->wpend_len+=2;
 646                 }
 647         s->s2->write_ptr=pp;
 648
 649         INC32(s->s2->write_sequence); /* expect next number */
 650
 651         /* lets try to actually write the data */
 652         s->s2->wpend_tot=olen;
 653         s->s2->wpend_buf=buf;
 654
 655         s->s2->wpend_ret=len;
 656
 657         s->s2->wpend_off=0;
 658         return(write_pending(s,buf,olen));
 659         }
 660
 661 int ssl2_part_read(SSL *s, unsigned long f, int i)
 662         {
 663         unsigned char *p;
 664         int j;
 665
 666         if (i < 0)
 667                 {
 668                 /* ssl2_return_error(s); */
 669                 /* for non-blocking io,
 670                  * this is not necessarily fatal */
 671                 return(i);
 672                 }
 673         else
 674                 {
 675                 s->init_num+=i;
 676
 677                 /* Check for error.  While there are recoverable errors,
 678                  * this function is not called when those must be expected;
 679                  * any error detected here is fatal. */
 680                 if (s->init_num >= 3)
 681                         {
 682                         p=(unsigned char *)s->init_buf->data;
 683                         if (p[0] == SSL2_MT_ERROR)
 684                                 {
 685                                 j=(p[1]<<8)|p[2];
 686                                 SSLerr((int)f,ssl_mt_error(j));
 687                                 s->init_num -= 3;
 688                                 if (s->init_num > 0)
 689                                         memmove(p, p+3, s->init_num);
 690                                 }
 691                         }
 692
 693                 /* If it's not an error message, we have some error anyway --
 694                  * the message was shorter than expected.  This too is treated
 695                  * as fatal (at least if SSL_get_error is asked for its opinion). */
 696                 return(0);
 697                 }
 698         }
 699
 700 int ssl2_do_write(SSL *s)
 701         {
 702         int ret;
 703
 704         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
 705         if (ret == s->init_num)
 706                 {
 707                 if (s->msg_callback)
 708                         s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
 709                 return(1);
 710                 }
 711         if (ret < 0)
 712                 return(-1);
 713         s->init_off+=ret;
 714         s->init_num-=ret;
 715         return(0);
 716         }
 717
 718 static int ssl_mt_error(int n)
 719         {
 720         int ret;
 721
 722         switch (n)
 723                 {
 724         case SSL2_PE_NO_CIPHER:
 725                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
 726                 break;
 727         case SSL2_PE_NO_CERTIFICATE:
 728                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
 729                 break;
 730         case SSL2_PE_BAD_CERTIFICATE:
 731                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
 732                 break;
 733         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
 734                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
 735                 break;
 736         default:
 737                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
 738                 break;
 739                 }
 740         return(ret);
 741         }
 742 #else /* !OPENSSL_NO_SSL2 */
 743
 744 # if PEDANTIC
 745 static void *dummy=&dummy;
 746 # endif
 747
 748 #endif