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 #include <stdio.h>
  60 #include <errno.h>
  61 #define USE_SOCKETS
  62 #include "ssl_locl.h"
  63
  64 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
  65 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
  66 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
  67 static int ssl_mt_error(int n);
  68 int ssl2_peek(SSL *s, char *buf, int len)
  69         {
  70         int ret;
  71
  72         ret=ssl2_read(s,buf,len);
  73         if (ret > 0)
  74                 {
  75                 s->s2->ract_data_length+=ret;
  76                 s->s2->ract_data-=ret;
  77                 }
  78         return(ret);
  79         }
  80
  81 /* SSL_read -
  82  * This routine will return 0 to len bytes, decrypted etc if required.
  83  */
  84 int ssl2_read(SSL *s, void *buf, int len)
  85         {
  86         int n;
  87         unsigned char mac[MAX_MAC_SIZE];
  88         unsigned char *p;
  89         int i;
  90         unsigned int mac_size=0;
  91
  92 ssl2_read_again:
  93         if (SSL_in_init(s) && !s->in_handshake)
  94                 {
  95                 n=s->handshake_func(s);
  96                 if (n < 0) return(n);
  97                 if (n == 0)
  98                         {
  99                         SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
 100                         return(-1);
 101                         }
 102                 }
 103
 104         clear_sys_error();
 105         s->rwstate=SSL_NOTHING;
 106         if (len <= 0) return(len);
 107
 108         if (s->s2->ract_data_length != 0) /* read from buffer */
 109                 {
 110                 if (len > s->s2->ract_data_length)
 111                         n=s->s2->ract_data_length;
 112                 else
 113                         n=len;
 114
 115                 memcpy(buf,s->s2->ract_data,(unsigned int)n);
 116                 s->s2->ract_data_length-=n;
 117                 s->s2->ract_data+=n;
 118                 if (s->s2->ract_data_length == 0)
 119                         s->rstate=SSL_ST_READ_HEADER;
 120                 return(n);
 121                 }
 122
 123         if (s->rstate == SSL_ST_READ_HEADER)
 124                 {
 125                 if (s->first_packet)
 126                         {
 127                         n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 128                         if (n <= 0) return(n); /* error or non-blocking */
 129                         s->first_packet=0;
 130                         p=s->packet;
 131                         if (!((p[0] & 0x80) && (
 132                                 (p[2] == SSL2_MT_CLIENT_HELLO) ||
 133                                 (p[2] == SSL2_MT_SERVER_HELLO))))
 134                                 {
 135                                 SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
 136                                 return(-1);
 137                                 }
 138                         }
 139                 else
 140                         {
 141                         n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 142                         if (n <= 0) return(n); /* error or non-blocking */
 143                         }
 144                 /* part read stuff */
 145
 146                 s->rstate=SSL_ST_READ_BODY;
 147                 p=s->packet;
 148                 /* Do header */
 149                 /*s->s2->padding=0;*/
 150                 s->s2->escape=0;
 151                 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
 152                 if ((p[0] & TWO_BYTE_BIT))              /* Two byte header? */
 153                         {
 154                         s->s2->three_byte_header=0;
 155                         s->s2->rlength&=TWO_BYTE_MASK;
 156                         }
 157                 else
 158                         {
 159                         s->s2->three_byte_header=1;
 160                         s->s2->rlength&=THREE_BYTE_MASK;
 161
 162                         /* security >s2->escape */
 163                         s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
 164                         }
 165                 }
 166
 167         if (s->rstate == SSL_ST_READ_BODY)
 168                 {
 169                 n=s->s2->rlength+2+s->s2->three_byte_header;
 170                 if (n > (int)s->packet_length)
 171                         {
 172                         n-=s->packet_length;
 173                         i=read_n(s,(unsigned int)n,(unsigned int)n,1);
 174                         if (i <= 0) return(i); /* ERROR */
 175                         }
 176
 177                 p= &(s->packet[2]);
 178                 s->rstate=SSL_ST_READ_HEADER;
 179                 if (s->s2->three_byte_header)
 180                         s->s2->padding= *(p++);
 181                 else    s->s2->padding=0;
 182
 183                 /* Data portion */
 184                 if (s->s2->clear_text)
 185                         {
 186                         s->s2->mac_data=p;
 187                         s->s2->ract_data=p;
 188                         s->s2->pad_data=NULL;
 189                         }
 190                 else
 191                         {
 192                         mac_size=EVP_MD_size(s->read_hash);
 193                         s->s2->mac_data=p;
 194                         s->s2->ract_data= &p[mac_size];
 195                         s->s2->pad_data= &p[mac_size+
 196                                 s->s2->rlength-s->s2->padding];
 197                         }
 198
 199                 s->s2->ract_data_length=s->s2->rlength;
 200                 /* added a check for length > max_size in case
 201                  * encryption was not turned on yet due to an error */
 202                 if ((!s->s2->clear_text) &&
 203                         (s->s2->rlength >= mac_size))
 204                         {
 205                         ssl2_enc(s,0);
 206                         s->s2->ract_data_length-=mac_size;
 207                         ssl2_mac(s,mac,0);
 208                         s->s2->ract_data_length-=s->s2->padding;
 209                         if (    (memcmp(mac,s->s2->mac_data,
 210                                 (unsigned int)mac_size) != 0) ||
 211                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
 212                                 {
 213                                 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
 214                                 return(-1);
 215                                 }
 216                         }
 217                 INC32(s->s2->read_sequence); /* expect next number */
 218                 /* s->s2->ract_data is now available for processing */
 219
 220 #if 1
 221                 /* How should we react when a packet containing 0
 222                  * bytes is received?  (Note that SSLeay/OpenSSL itself
 223                  * never sends such packets; see ssl2_write.)
 224                  * Returning 0 would be interpreted by the caller as
 225                  * indicating EOF, so it's not a good idea.
 226                  * Instead, we just continue reading.  Note that using
 227                  * select() for blocking sockets *never* guarantees
 228                  * that the next SSL_read will not block -- the available
 229                  * data may contain incomplete packets, and except for SSL 2
 230                  * renegotiation can confuse things even more. */
 231
 232                 goto ssl2_read_again; /* This should really be
 233                                        * "return ssl2_read(s,buf,len)",
 234                                        * but that would allow for
 235                                        * denial-of-service attacks if a
 236                                        * C compiler is used that does not
 237                                        * recognize end-recursion. */
 238 #else
 239                 /* If a 0 byte packet was sent, return 0, otherwise
 240                  * we play havoc with people using select with
 241                  * blocking sockets.  Let them handle a packet at a time,
 242                  * they should really be using non-blocking sockets. */
 243                 if (s->s2->ract_data_length == 0)
 244                         return(0);
 245                 return(ssl2_read(s,buf,len));
 246 #endif
 247                 }
 248         else
 249                 {
 250                 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
 251                         return(-1);
 252                 }
 253         }
 254
 255 static int read_n(SSL *s, unsigned int n, unsigned int max,
 256              unsigned int extend)
 257         {
 258         int i,off,newb;
 259
 260         /* if there is stuff still in the buffer from a previous read,
 261          * and there is more than we want, take some. */
 262         if (s->s2->rbuf_left >= (int)n)
 263                 {
 264                 if (extend)
 265                         s->packet_length+=n;
 266                 else
 267                         {
 268                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
 269                         s->packet_length=n;
 270                         }
 271                 s->s2->rbuf_left-=n;
 272                 s->s2->rbuf_offs+=n;
 273                 return(n);
 274                 }
 275
 276         if (!s->read_ahead) max=n;
 277         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
 278                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
 279
 280
 281         /* Else we want more than we have.
 282          * First, if there is some left or we want to extend */
 283         off=0;
 284         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
 285                 {
 286                 newb=s->s2->rbuf_left;
 287                 if (extend)
 288                         {
 289                         off=s->packet_length;
 290                         if (s->packet != s->s2->rbuf)
 291                                 memcpy(s->s2->rbuf,s->packet,
 292                                         (unsigned int)newb+off);
 293                         }
 294                 else if (s->s2->rbuf_offs != 0)
 295                         {
 296                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
 297                                 (unsigned int)newb);
 298                         s->s2->rbuf_offs=0;
 299                         }
 300                 s->s2->rbuf_left=0;
 301                 }
 302         else
 303                 newb=0;
 304
 305         /* off is the offset to start writing too.
 306          * r->s2->rbuf_offs is the 'unread data', now 0.
 307          * newb is the number of new bytes so far
 308          */
 309         s->packet=s->s2->rbuf;
 310         while (newb < (int)n)
 311                 {
 312                 clear_sys_error();
 313                 if (s->rbio != NULL)
 314                         {
 315                         s->rwstate=SSL_READING;
 316                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
 317                                 max-newb);
 318                         }
 319                 else
 320                         {
 321                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
 322                         i= -1;
 323                         }
 324 #ifdef PKT_DEBUG
 325                 if (s->debug & 0x01) sleep(1);
 326 #endif
 327                 if (i <= 0)
 328                         {
 329                         s->s2->rbuf_left+=newb;
 330                         return(i);
 331                         }
 332                 newb+=i;
 333                 }
 334
 335         /* record unread data */
 336         if (newb > (int)n)
 337                 {
 338                 s->s2->rbuf_offs=n+off;
 339                 s->s2->rbuf_left=newb-n;
 340                 }
 341         else
 342                 {
 343                 s->s2->rbuf_offs=0;
 344                 s->s2->rbuf_left=0;
 345                 }
 346         if (extend)
 347                 s->packet_length+=n;
 348         else
 349                 s->packet_length=n;
 350         s->rwstate=SSL_NOTHING;
 351         return(n);
 352         }
 353
 354 int ssl2_write(SSL *s, const void *_buf, int len)
 355         {
 356         const unsigned char *buf=_buf;
 357         unsigned int n,tot;
 358         int i;
 359
 360         if (SSL_in_init(s) && !s->in_handshake)
 361                 {
 362                 i=s->handshake_func(s);
 363                 if (i < 0) return(i);
 364                 if (i == 0)
 365                         {
 366                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
 367                         return(-1);
 368                         }
 369                 }
 370
 371         if (s->error)
 372                 {
 373                 ssl2_write_error(s);
 374                 if (s->error)
 375                         return(-1);
 376                 }
 377
 378         clear_sys_error();
 379         s->rwstate=SSL_NOTHING;
 380         if (len <= 0) return(len);
 381
 382         tot=s->s2->wnum;
 383         s->s2->wnum=0;
 384
 385         n=(len-tot);
 386         for (;;)
 387                 {
 388                 i=do_ssl_write(s,&(buf[tot]),n);
 389                 if (i <= 0)
 390                         {
 391                         s->s2->wnum=tot;
 392                         return(i);
 393                         }
 394                 if ((i == (int)n) ||
 395                         (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
 396                         {
 397                         return(tot+i);
 398                         }
 399
 400                 n-=i;
 401                 tot+=i;
 402                 }
 403         }
 404
 405 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
 406         {
 407         int i;
 408
 409         /* s->s2->wpend_len != 0 MUST be true. */
 410
 411         /* check that they have given us the same buffer to
 412          * write */
 413         if ((s->s2->wpend_tot > (int)len) ||
 414                 ((s->s2->wpend_buf != buf) &&
 415                  !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
 416                 {
 417                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 418                 return(-1);
 419                 }
 420
 421         for (;;)
 422                 {
 423                 clear_sys_error();
 424                 if (s->wbio != NULL)
 425                         {
 426                         s->rwstate=SSL_WRITING;
 427                         i=BIO_write(s->wbio,
 428                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
 429                                 (unsigned int)s->s2->wpend_len);
 430                         }
 431                 else
 432                         {
 433                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
 434                         i= -1;
 435                         }
 436 #ifdef PKT_DEBUG
 437                 if (s->debug & 0x01) sleep(1);
 438 #endif
 439                 if (i == s->s2->wpend_len)
 440                         {
 441                         s->s2->wpend_len=0;
 442                         s->rwstate=SSL_NOTHING;
 443                         return(s->s2->wpend_ret);
 444                         }
 445                 else if (i <= 0)
 446                         return(i);
 447                 s->s2->wpend_off+=i;
 448                 s->s2->wpend_len-=i;
 449                 }
 450         }
 451
 452 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
 453         {
 454         unsigned int j,k,olen,p,mac_size,bs;
 455         register unsigned char *pp;
 456
 457         olen=len;
 458
 459         /* first check if there is data from an encryption waiting to
 460          * be sent - it must be sent because the other end is waiting.
 461          * This will happen with non-blocking IO.  We print it and then
 462          * return.
 463          */
 464         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
 465
 466         /* set mac_size to mac size */
 467         if (s->s2->clear_text)
 468                 mac_size=0;
 469         else
 470                 mac_size=EVP_MD_size(s->write_hash);
 471
 472         /* lets set the pad p */
 473         if (s->s2->clear_text)
 474                 {
 475                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 476                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 477                 p=0;
 478                 s->s2->three_byte_header=0;
 479                 /* len=len; */
 480                 }
 481         else
 482                 {
 483                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
 484                 j=len+mac_size;
 485                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
 486                         (!s->s2->escape))
 487                         {
 488                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 489                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 490                         /* set k to the max number of bytes with 2
 491                          * byte header */
 492                         k=j-(j%bs);
 493                         /* how many data bytes? */
 494                         len=k-mac_size;
 495                         s->s2->three_byte_header=0;
 496                         p=0;
 497                         }
 498                 else if ((bs <= 1) && (!s->s2->escape))
 499                         {
 500                         /* len=len; */
 501                         s->s2->three_byte_header=0;
 502                         p=0;
 503                         }
 504                 else /* 3 byte header */
 505                         {
 506                         /*len=len; */
 507                         p=(j%bs);
 508                         p=(p == 0)?0:(bs-p);
 509                         if (s->s2->escape)
 510                                 s->s2->three_byte_header=1;
 511                         else
 512                                 s->s2->three_byte_header=(p == 0)?0:1;
 513                         }
 514                 }
 515         /* mac_size is the number of MAC bytes
 516          * len is the number of data bytes we are going to send
 517          * p is the number of padding bytes
 518          * if p == 0, it is a 2 byte header */
 519
 520         s->s2->wlength=len;
 521         s->s2->padding=p;
 522         s->s2->mac_data= &(s->s2->wbuf[3]);
 523         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
 524         /* we copy the data into s->s2->wbuf */
 525         memcpy(s->s2->wact_data,buf,len);
 526 #ifdef PURIFY
 527         if (p)
 528                 memset(&(s->s2->wact_data[len]),0,p);
 529 #endif
 530
 531         if (!s->s2->clear_text)
 532                 {
 533                 s->s2->wact_data_length=len+p;
 534                 ssl2_mac(s,s->s2->mac_data,1);
 535                 s->s2->wlength+=p+mac_size;
 536                 ssl2_enc(s,1);
 537                 }
 538
 539         /* package up the header */
 540         s->s2->wpend_len=s->s2->wlength;
 541         if (s->s2->three_byte_header) /* 3 byte header */
 542                 {
 543                 pp=s->s2->mac_data;
 544                 pp-=3;
 545                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
 546                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
 547                 pp[1]=s->s2->wlength&0xff;
 548                 pp[2]=s->s2->padding;
 549                 s->s2->wpend_len+=3;
 550                 }
 551         else
 552                 {
 553                 pp=s->s2->mac_data;
 554                 pp-=2;
 555                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
 556                 pp[1]=s->s2->wlength&0xff;
 557                 s->s2->wpend_len+=2;
 558                 }
 559         s->s2->write_ptr=pp;
 560
 561         INC32(s->s2->write_sequence); /* expect next number */
 562
 563         /* lets try to actually write the data */
 564         s->s2->wpend_tot=olen;
 565         s->s2->wpend_buf=buf;
 566
 567         s->s2->wpend_ret=len;
 568
 569         s->s2->wpend_off=0;
 570         return(write_pending(s,buf,olen));
 571         }
 572
 573 int ssl2_part_read(SSL *s, unsigned long f, int i)
 574         {
 575         unsigned char *p;
 576         int j;
 577
 578         /* check for error */
 579         if ((s->init_num == 0) && (i >= 3))
 580                 {
 581                 p=(unsigned char *)s->init_buf->data;
 582                 if (p[0] == SSL2_MT_ERROR)
 583                         {
 584                         j=(p[1]<<8)|p[2];
 585                         SSLerr((int)f,ssl_mt_error(j));
 586                         }
 587                 }
 588
 589         if (i < 0)
 590                 {
 591                 /* ssl2_return_error(s); */
 592                 /* for non-blocking io,
 593                  * this is not fatal */
 594                 return(i);
 595                 }
 596         else
 597                 {
 598                 s->init_num+=i;
 599                 return(0);
 600                 }
 601         }
 602
 603 int ssl2_do_write(SSL *s)
 604         {
 605         int ret;
 606
 607         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
 608         if (ret == s->init_num)
 609                 return(1);
 610         if (ret < 0)
 611                 return(-1);
 612         s->init_off+=ret;
 613         s->init_num-=ret;
 614         return(0);
 615         }
 616
 617 static int ssl_mt_error(int n)
 618         {
 619         int ret;
 620
 621         switch (n)
 622                 {
 623         case SSL2_PE_NO_CIPHER:
 624                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
 625                 break;
 626         case SSL2_PE_NO_CERTIFICATE:
 627                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
 628                 break;
 629         case SSL2_PE_BAD_CERTIFICATE:
 630                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
 631                 break;
 632         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
 633                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
 634                 break;
 635         default:
 636                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
 637                 break;
 638                 }
 639         return(ret);
 640         }