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) 1998-2000 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 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 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         unsigned int mac_size=0;
 134
 135         if (peek)
 136                 {
 137                 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_FIXME); /* proper implementation not yet completed */
 138                 return -1;
 139                 }
 140
 141 ssl2_read_again:
 142         if (SSL_in_init(s) && !s->in_handshake)
 143                 {
 144                 n=s->handshake_func(s);
 145                 if (n < 0) return(n);
 146                 if (n == 0)
 147                         {
 148                         SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE);
 149                         return(-1);
 150                         }
 151                 }
 152
 153         clear_sys_error();
 154         s->rwstate=SSL_NOTHING;
 155         if (len <= 0) return(len);
 156
 157         if (s->s2->ract_data_length != 0) /* read from buffer */
 158                 {
 159                 if (len > s->s2->ract_data_length)
 160                         n=s->s2->ract_data_length;
 161                 else
 162                         n=len;
 163
 164                 memcpy(buf,s->s2->ract_data,(unsigned int)n);
 165                 s->s2->ract_data_length-=n;
 166                 s->s2->ract_data+=n;
 167                 if (s->s2->ract_data_length == 0)
 168                         s->rstate=SSL_ST_READ_HEADER;
 169                 return(n);
 170                 }
 171
 172         if (s->rstate == SSL_ST_READ_HEADER)
 173                 {
 174                 if (s->first_packet)
 175                         {
 176                         n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 177                         if (n <= 0) return(n); /* error or non-blocking */
 178                         s->first_packet=0;
 179                         p=s->packet;
 180                         if (!((p[0] & 0x80) && (
 181                                 (p[2] == SSL2_MT_CLIENT_HELLO) ||
 182                                 (p[2] == SSL2_MT_SERVER_HELLO))))
 183                                 {
 184                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET);
 185                                 return(-1);
 186                                 }
 187                         }
 188                 else
 189                         {
 190                         n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 191                         if (n <= 0) return(n); /* error or non-blocking */
 192                         }
 193                 /* part read stuff */
 194
 195                 s->rstate=SSL_ST_READ_BODY;
 196                 p=s->packet;
 197                 /* Do header */
 198                 /*s->s2->padding=0;*/
 199                 s->s2->escape=0;
 200                 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
 201                 if ((p[0] & TWO_BYTE_BIT))              /* Two byte header? */
 202                         {
 203                         s->s2->three_byte_header=0;
 204                         s->s2->rlength&=TWO_BYTE_MASK;
 205                         }
 206                 else
 207                         {
 208                         s->s2->three_byte_header=1;
 209                         s->s2->rlength&=THREE_BYTE_MASK;
 210
 211                         /* security >s2->escape */
 212                         s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
 213                         }
 214                 }
 215
 216         if (s->rstate == SSL_ST_READ_BODY)
 217                 {
 218                 n=s->s2->rlength+2+s->s2->three_byte_header;
 219                 if (n > (int)s->packet_length)
 220                         {
 221                         n-=s->packet_length;
 222                         i=read_n(s,(unsigned int)n,(unsigned int)n,1);
 223                         if (i <= 0) return(i); /* ERROR */
 224                         }
 225
 226                 p= &(s->packet[2]);
 227                 s->rstate=SSL_ST_READ_HEADER;
 228                 if (s->s2->three_byte_header)
 229                         s->s2->padding= *(p++);
 230                 else    s->s2->padding=0;
 231
 232                 /* Data portion */
 233                 if (s->s2->clear_text)
 234                         {
 235                         s->s2->mac_data=p;
 236                         s->s2->ract_data=p;
 237                         s->s2->pad_data=NULL;
 238                         }
 239                 else
 240                         {
 241                         mac_size=EVP_MD_size(s->read_hash);
 242                         s->s2->mac_data=p;
 243                         s->s2->ract_data= &p[mac_size];
 244                         s->s2->pad_data= &p[mac_size+
 245                                 s->s2->rlength-s->s2->padding];
 246                         }
 247
 248                 s->s2->ract_data_length=s->s2->rlength;
 249                 /* added a check for length > max_size in case
 250                  * encryption was not turned on yet due to an error */
 251                 if ((!s->s2->clear_text) &&
 252                         (s->s2->rlength >= mac_size))
 253                         {
 254                         ssl2_enc(s,0);
 255                         s->s2->ract_data_length-=mac_size;
 256                         ssl2_mac(s,mac,0);
 257                         s->s2->ract_data_length-=s->s2->padding;
 258                         if (    (memcmp(mac,s->s2->mac_data,
 259                                 (unsigned int)mac_size) != 0) ||
 260                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
 261                                 {
 262                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
 263                                 return(-1);
 264                                 }
 265                         }
 266                 INC32(s->s2->read_sequence); /* expect next number */
 267                 /* s->s2->ract_data is now available for processing */
 268
 269 #if 1
 270                 /* How should we react when a packet containing 0
 271                  * bytes is received?  (Note that SSLeay/OpenSSL itself
 272                  * never sends such packets; see ssl2_write.)
 273                  * Returning 0 would be interpreted by the caller as
 274                  * indicating EOF, so it's not a good idea.
 275                  * Instead, we just continue reading.  Note that using
 276                  * select() for blocking sockets *never* guarantees
 277                  * that the next SSL_read will not block -- the available
 278                  * data may contain incomplete packets, and except for SSL 2
 279                  * renegotiation can confuse things even more. */
 280
 281                 goto ssl2_read_again; /* This should really be
 282                                        * "return ssl2_read(s,buf,len)",
 283                                        * but that would allow for
 284                                        * denial-of-service attacks if a
 285                                        * C compiler is used that does not
 286                                        * recognize end-recursion. */
 287 #else
 288                 /* If a 0 byte packet was sent, return 0, otherwise
 289                  * we play havoc with people using select with
 290                  * blocking sockets.  Let them handle a packet at a time,
 291                  * they should really be using non-blocking sockets. */
 292                 if (s->s2->ract_data_length == 0)
 293                         return(0);
 294                 return(ssl2_read(s,buf,len));
 295 #endif
 296                 }
 297         else
 298                 {
 299                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
 300                         return(-1);
 301                 }
 302         }
 303
 304 int ssl2_read(SSL *s, void *buf, int len)
 305         {
 306         return ssl2_read_internal(s, buf, len, 0);
 307         }
 308
 309 int ssl2_peek(SSL *s, char *buf, int len)
 310         {
 311         return ssl2_read_internal(s, buf, len, 1);
 312         }
 313
 314 static int read_n(SSL *s, unsigned int n, unsigned int max,
 315              unsigned int extend)
 316         {
 317         int i,off,newb;
 318
 319         /* if there is stuff still in the buffer from a previous read,
 320          * and there is more than we want, take some. */
 321         if (s->s2->rbuf_left >= (int)n)
 322                 {
 323                 if (extend)
 324                         s->packet_length+=n;
 325                 else
 326                         {
 327                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
 328                         s->packet_length=n;
 329                         }
 330                 s->s2->rbuf_left-=n;
 331                 s->s2->rbuf_offs+=n;
 332                 return(n);
 333                 }
 334
 335         if (!s->read_ahead) max=n;
 336         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
 337                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
 338
 339
 340         /* Else we want more than we have.
 341          * First, if there is some left or we want to extend */
 342         off=0;
 343         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
 344                 {
 345                 newb=s->s2->rbuf_left;
 346                 if (extend)
 347                         {
 348                         off=s->packet_length;
 349                         if (s->packet != s->s2->rbuf)
 350                                 memcpy(s->s2->rbuf,s->packet,
 351                                         (unsigned int)newb+off);
 352                         }
 353                 else if (s->s2->rbuf_offs != 0)
 354                         {
 355                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
 356                                 (unsigned int)newb);
 357                         s->s2->rbuf_offs=0;
 358                         }
 359                 s->s2->rbuf_left=0;
 360                 }
 361         else
 362                 newb=0;
 363
 364         /* off is the offset to start writing too.
 365          * r->s2->rbuf_offs is the 'unread data', now 0.
 366          * newb is the number of new bytes so far
 367          */
 368         s->packet=s->s2->rbuf;
 369         while (newb < (int)n)
 370                 {
 371                 clear_sys_error();
 372                 if (s->rbio != NULL)
 373                         {
 374                         s->rwstate=SSL_READING;
 375                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
 376                                 max-newb);
 377                         }
 378                 else
 379                         {
 380                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
 381                         i= -1;
 382                         }
 383 #ifdef PKT_DEBUG
 384                 if (s->debug & 0x01) sleep(1);
 385 #endif
 386                 if (i <= 0)
 387                         {
 388                         s->s2->rbuf_left+=newb;
 389                         return(i);
 390                         }
 391                 newb+=i;
 392                 }
 393
 394         /* record unread data */
 395         if (newb > (int)n)
 396                 {
 397                 s->s2->rbuf_offs=n+off;
 398                 s->s2->rbuf_left=newb-n;
 399                 }
 400         else
 401                 {
 402                 s->s2->rbuf_offs=0;
 403                 s->s2->rbuf_left=0;
 404                 }
 405         if (extend)
 406                 s->packet_length+=n;
 407         else
 408                 s->packet_length=n;
 409         s->rwstate=SSL_NOTHING;
 410         return(n);
 411         }
 412
 413 int ssl2_write(SSL *s, const void *_buf, int len)
 414         {
 415         const unsigned char *buf=_buf;
 416         unsigned int n,tot;
 417         int i;
 418
 419         if (SSL_in_init(s) && !s->in_handshake)
 420                 {
 421                 i=s->handshake_func(s);
 422                 if (i < 0) return(i);
 423                 if (i == 0)
 424                         {
 425                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
 426                         return(-1);
 427                         }
 428                 }
 429
 430         if (s->error)
 431                 {
 432                 ssl2_write_error(s);
 433                 if (s->error)
 434                         return(-1);
 435                 }
 436
 437         clear_sys_error();
 438         s->rwstate=SSL_NOTHING;
 439         if (len <= 0) return(len);
 440
 441         tot=s->s2->wnum;
 442         s->s2->wnum=0;
 443
 444         n=(len-tot);
 445         for (;;)
 446                 {
 447                 i=do_ssl_write(s,&(buf[tot]),n);
 448                 if (i <= 0)
 449                         {
 450                         s->s2->wnum=tot;
 451                         return(i);
 452                         }
 453                 if ((i == (int)n) ||
 454                         (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
 455                         {
 456                         return(tot+i);
 457                         }
 458
 459                 n-=i;
 460                 tot+=i;
 461                 }
 462         }
 463
 464 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
 465         {
 466         int i;
 467
 468         /* s->s2->wpend_len != 0 MUST be true. */
 469
 470         /* check that they have given us the same buffer to
 471          * write */
 472         if ((s->s2->wpend_tot > (int)len) ||
 473                 ((s->s2->wpend_buf != buf) &&
 474                  !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
 475                 {
 476                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 477                 return(-1);
 478                 }
 479
 480         for (;;)
 481                 {
 482                 clear_sys_error();
 483                 if (s->wbio != NULL)
 484                         {
 485                         s->rwstate=SSL_WRITING;
 486                         i=BIO_write(s->wbio,
 487                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
 488                                 (unsigned int)s->s2->wpend_len);
 489                         }
 490                 else
 491                         {
 492                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
 493                         i= -1;
 494                         }
 495 #ifdef PKT_DEBUG
 496                 if (s->debug & 0x01) sleep(1);
 497 #endif
 498                 if (i == s->s2->wpend_len)
 499                         {
 500                         s->s2->wpend_len=0;
 501                         s->rwstate=SSL_NOTHING;
 502                         return(s->s2->wpend_ret);
 503                         }
 504                 else if (i <= 0)
 505                         return(i);
 506                 s->s2->wpend_off+=i;
 507                 s->s2->wpend_len-=i;
 508                 }
 509         }
 510
 511 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
 512         {
 513         unsigned int j,k,olen,p,mac_size,bs;
 514         register unsigned char *pp;
 515
 516         olen=len;
 517
 518         /* first check if there is data from an encryption waiting to
 519          * be sent - it must be sent because the other end is waiting.
 520          * This will happen with non-blocking IO.  We print it and then
 521          * return.
 522          */
 523         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
 524
 525         /* set mac_size to mac size */
 526         if (s->s2->clear_text)
 527                 mac_size=0;
 528         else
 529                 mac_size=EVP_MD_size(s->write_hash);
 530
 531         /* lets set the pad p */
 532         if (s->s2->clear_text)
 533                 {
 534                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 535                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 536                 p=0;
 537                 s->s2->three_byte_header=0;
 538                 /* len=len; */
 539                 }
 540         else
 541                 {
 542                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
 543                 j=len+mac_size;
 544                 /* Two-byte headers allow for a larger record length than
 545                  * three-byte headers, but we can't use them if we need
 546                  * padding or if we have to set the escape bit. */
 547                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
 548                         (!s->s2->escape))
 549                         {
 550                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 551                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 552                         /* set k to the max number of bytes with 2
 553                          * byte header */
 554                         k=j-(j%bs);
 555                         /* how many data bytes? */
 556                         len=k-mac_size;
 557                         s->s2->three_byte_header=0;
 558                         p=0;
 559                         }
 560                 else if ((bs <= 1) && (!s->s2->escape))
 561                         {
 562                         /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
 563                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
 564                         s->s2->three_byte_header=0;
 565                         p=0;
 566                         }
 567                 else /* we may have to use a 3 byte header */
 568                         {
 569                         /* If s->s2->escape is not set, then
 570                          * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
 571                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
 572                         p=(j%bs);
 573                         p=(p == 0)?0:(bs-p);
 574                         if (s->s2->escape)
 575                                 {
 576                                 s->s2->three_byte_header=1;
 577                                 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
 578                                         j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
 579                                 }
 580                         else
 581                                 s->s2->three_byte_header=(p == 0)?0:1;
 582                         }
 583                 }
 584
 585         /* Now
 586          *      j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
 587          * holds, and if s->s2->three_byte_header is set, then even
 588          *      j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
 589          */
 590
 591         /* mac_size is the number of MAC bytes
 592          * len is the number of data bytes we are going to send
 593          * p is the number of padding bytes
 594          * (if it is a two-byte header, then p == 0) */
 595
 596         s->s2->wlength=len;
 597         s->s2->padding=p;
 598         s->s2->mac_data= &(s->s2->wbuf[3]);
 599         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
 600         /* we copy the data into s->s2->wbuf */
 601         memcpy(s->s2->wact_data,buf,len);
 602 #ifdef PURIFY
 603         if (p)
 604                 memset(&(s->s2->wact_data[len]),0,p);
 605 #endif
 606
 607         if (!s->s2->clear_text)
 608                 {
 609                 s->s2->wact_data_length=len+p;
 610                 ssl2_mac(s,s->s2->mac_data,1);
 611                 s->s2->wlength+=p+mac_size;
 612                 ssl2_enc(s,1);
 613                 }
 614
 615         /* package up the header */
 616         s->s2->wpend_len=s->s2->wlength;
 617         if (s->s2->three_byte_header) /* 3 byte header */
 618                 {
 619                 pp=s->s2->mac_data;
 620                 pp-=3;
 621                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
 622                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
 623                 pp[1]=s->s2->wlength&0xff;
 624                 pp[2]=s->s2->padding;
 625                 s->s2->wpend_len+=3;
 626                 }
 627         else
 628                 {
 629                 pp=s->s2->mac_data;
 630                 pp-=2;
 631                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
 632                 pp[1]=s->s2->wlength&0xff;
 633                 s->s2->wpend_len+=2;
 634                 }
 635         s->s2->write_ptr=pp;
 636
 637         INC32(s->s2->write_sequence); /* expect next number */
 638
 639         /* lets try to actually write the data */
 640         s->s2->wpend_tot=olen;
 641         s->s2->wpend_buf=buf;
 642
 643         s->s2->wpend_ret=len;
 644
 645         s->s2->wpend_off=0;
 646         return(write_pending(s,buf,olen));
 647         }
 648
 649 int ssl2_part_read(SSL *s, unsigned long f, int i)
 650         {
 651         unsigned char *p;
 652         int j;
 653
 654         /* check for error */
 655         if ((s->init_num == 0) && (i >= 3))
 656                 {
 657                 p=(unsigned char *)s->init_buf->data;
 658                 if (p[0] == SSL2_MT_ERROR)
 659                         {
 660                         j=(p[1]<<8)|p[2];
 661                         SSLerr((int)f,ssl_mt_error(j));
 662                         }
 663                 }
 664
 665         if (i < 0)
 666                 {
 667                 /* ssl2_return_error(s); */
 668                 /* for non-blocking io,
 669                  * this is not fatal */
 670                 return(i);
 671                 }
 672         else
 673                 {
 674                 s->init_num+=i;
 675                 return(0);
 676                 }
 677         }
 678
 679 int ssl2_do_write(SSL *s)
 680         {
 681         int ret;
 682
 683         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
 684         if (ret == s->init_num)
 685                 return(1);
 686         if (ret < 0)
 687                 return(-1);
 688         s->init_off+=ret;
 689         s->init_num-=ret;
 690         return(0);
 691         }
 692
 693 static int ssl_mt_error(int n)
 694         {
 695         int ret;
 696
 697         switch (n)
 698                 {
 699         case SSL2_PE_NO_CIPHER:
 700                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
 701                 break;
 702         case SSL2_PE_NO_CERTIFICATE:
 703                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
 704                 break;
 705         case SSL2_PE_BAD_CERTIFICATE:
 706                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
 707                 break;
 708         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
 709                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
 710                 break;
 711         default:
 712                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
 713                 break;
 714                 }
 715         return(ret);
 716         }
 717 #else /* !NO_SSL2 */
 718
 719 # if PEDANTIC
 720 static void *dummy=&dummy;
 721 # endif
 722
 723 #endif