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 /* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CIPHER);
  65  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CERTIFICATE);
  66  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_CERTIFICATE);
  67  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
  68  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_UNKNOWN_REMOTE_ERROR_TYPE);
  69  */
  70
  71 #ifndef NOPROTO
  72 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
  73 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
  74 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
  75 static int ssl_mt_error(int n);
  76 #else
  77 static int read_n();
  78 static int do_ssl_write();
  79 static int write_pending();
  80 static int ssl_mt_error();
  81 #endif
  82
  83 int ssl2_peek(SSL *s, char *buf, int len)
  84         {
  85         int ret;
  86
  87         ret=ssl2_read(s,buf,len);
  88         if (ret > 0)
  89                 {
  90                 s->s2->ract_data_length+=ret;
  91                 s->s2->ract_data-=ret;
  92                 }
  93         return(ret);
  94         }
  95
  96 /* SSL_read -
  97  * This routine will return 0 to len bytes, decrypted etc if required.
  98  */
  99 int ssl2_read(SSL *s, void *buf, int len)
 100         {
 101         int n;
 102         unsigned char mac[MAX_MAC_SIZE];
 103         unsigned char *p;
 104         int i;
 105         unsigned int mac_size=0;
 106
 107 ssl2_read_again:
 108         if (SSL_in_init(s) && !s->in_handshake)
 109                 {
 110                 n=s->handshake_func(s);
 111                 if (n < 0) return(n);
 112                 if (n == 0)
 113                         {
 114                         SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
 115                         return(-1);
 116                         }
 117                 }
 118
 119         clear_sys_error();
 120         s->rwstate=SSL_NOTHING;
 121         if (len <= 0) return(len);
 122
 123         if (s->s2->ract_data_length != 0) /* read from buffer */
 124                 {
 125                 if (len > s->s2->ract_data_length)
 126                         n=s->s2->ract_data_length;
 127                 else
 128                         n=len;
 129
 130                 memcpy(buf,s->s2->ract_data,(unsigned int)n);
 131                 s->s2->ract_data_length-=n;
 132                 s->s2->ract_data+=n;
 133                 if (s->s2->ract_data_length == 0)
 134                         s->rstate=SSL_ST_READ_HEADER;
 135                 return(n);
 136                 }
 137
 138         if (s->rstate == SSL_ST_READ_HEADER)
 139                 {
 140                 if (s->first_packet)
 141                         {
 142                         n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 143                         if (n <= 0) return(n); /* error or non-blocking */
 144                         s->first_packet=0;
 145                         p=s->packet;
 146                         if (!((p[0] & 0x80) && (
 147                                 (p[2] == SSL2_MT_CLIENT_HELLO) ||
 148                                 (p[2] == SSL2_MT_SERVER_HELLO))))
 149                                 {
 150                                 SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
 151                                 return(-1);
 152                                 }
 153                         }
 154                 else
 155                         {
 156                         n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
 157                         if (n <= 0) return(n); /* error or non-blocking */
 158                         }
 159                 /* part read stuff */
 160
 161                 s->rstate=SSL_ST_READ_BODY;
 162                 p=s->packet;
 163                 /* Do header */
 164                 /*s->s2->padding=0;*/
 165                 s->s2->escape=0;
 166                 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
 167                 if ((p[0] & TWO_BYTE_BIT))              /* Two byte header? */
 168                         {
 169                         s->s2->three_byte_header=0;
 170                         s->s2->rlength&=TWO_BYTE_MASK;
 171                         }
 172                 else
 173                         {
 174                         s->s2->three_byte_header=1;
 175                         s->s2->rlength&=THREE_BYTE_MASK;
 176
 177                         /* security >s2->escape */
 178                         s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
 179                         }
 180                 }
 181
 182         if (s->rstate == SSL_ST_READ_BODY)
 183                 {
 184                 n=s->s2->rlength+2+s->s2->three_byte_header;
 185                 if (n > (int)s->packet_length)
 186                         {
 187                         n-=s->packet_length;
 188                         i=read_n(s,(unsigned int)n,(unsigned int)n,1);
 189                         if (i <= 0) return(i); /* ERROR */
 190                         }
 191
 192                 p= &(s->packet[2]);
 193                 s->rstate=SSL_ST_READ_HEADER;
 194                 if (s->s2->three_byte_header)
 195                         s->s2->padding= *(p++);
 196                 else    s->s2->padding=0;
 197
 198                 /* Data portion */
 199                 if (s->s2->clear_text)
 200                         {
 201                         s->s2->mac_data=p;
 202                         s->s2->ract_data=p;
 203                         s->s2->pad_data=NULL;
 204                         }
 205                 else
 206                         {
 207                         mac_size=EVP_MD_size(s->read_hash);
 208                         s->s2->mac_data=p;
 209                         s->s2->ract_data= &p[mac_size];
 210                         s->s2->pad_data= &p[mac_size+
 211                                 s->s2->rlength-s->s2->padding];
 212                         }
 213
 214                 s->s2->ract_data_length=s->s2->rlength;
 215                 /* added a check for length > max_size in case
 216                  * encryption was not turned on yet due to an error */
 217                 if ((!s->s2->clear_text) &&
 218                         (s->s2->rlength >= mac_size))
 219                         {
 220                         ssl2_enc(s,0);
 221                         s->s2->ract_data_length-=mac_size;
 222                         ssl2_mac(s,mac,0);
 223                         s->s2->ract_data_length-=s->s2->padding;
 224                         if (    (memcmp(mac,s->s2->mac_data,
 225                                 (unsigned int)mac_size) != 0) ||
 226                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
 227                                 {
 228                                 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
 229                                 return(-1);
 230                                 }
 231                         }
 232                 INC32(s->s2->read_sequence); /* expect next number */
 233                 /* s->s2->ract_data is now available for processing */
 234
 235 #if 1
 236                 /* How should we react when a packet containing 0
 237                  * bytes is received?  (Note that SSLeay/OpenSSL itself
 238                  * never sends such packets; see ssl2_write.)
 239                  * Returning 0 would be interpreted by the caller as
 240                  * indicating EOF, so it's not a good idea.
 241                  * Instead, we just continue reading.  Note that using
 242                  * select() for blocking sockets *never* guarantees
 243                  * that the next SSL_read will not block -- the available
 244                  * data may contain incomplete packets, and except for SSL 2
 245                  * renegotiation can confuse things even more. */
 246
 247                 goto ssl2_read_again; /* This should really be
 248                                        * "return ssl2_read(s,buf,len)",
 249                                        * but that would allow for
 250                                        * denial-of-service attacks if a
 251                                        * C compiler is used that does not
 252                                        * recognize end-recursion. */
 253 #else
 254                 /* If a 0 byte packet was sent, return 0, otherwise
 255                  * we play havoc with people using select with
 256                  * blocking sockets.  Let them handle a packet at a time,
 257                  * they should really be using non-blocking sockets. */
 258                 if (s->s2->ract_data_length == 0)
 259                         return(0);
 260                 return(ssl2_read(s,buf,len));
 261 #endif
 262                 }
 263         else
 264                 {
 265                 SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
 266                         return(-1);
 267                 }
 268         }
 269
 270 static int read_n(SSL *s, unsigned int n, unsigned int max,
 271              unsigned int extend)
 272         {
 273         int i,off,newb;
 274
 275         /* if there is stuff still in the buffer from a previous read,
 276          * and there is more than we want, take some. */
 277         if (s->s2->rbuf_left >= (int)n)
 278                 {
 279                 if (extend)
 280                         s->packet_length+=n;
 281                 else
 282                         {
 283                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
 284                         s->packet_length=n;
 285                         }
 286                 s->s2->rbuf_left-=n;
 287                 s->s2->rbuf_offs+=n;
 288                 return(n);
 289                 }
 290
 291         if (!s->read_ahead) max=n;
 292         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
 293                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
 294
 295
 296         /* Else we want more than we have.
 297          * First, if there is some left or we want to extend */
 298         off=0;
 299         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
 300                 {
 301                 newb=s->s2->rbuf_left;
 302                 if (extend)
 303                         {
 304                         off=s->packet_length;
 305                         if (s->packet != s->s2->rbuf)
 306                                 memcpy(s->s2->rbuf,s->packet,
 307                                         (unsigned int)newb+off);
 308                         }
 309                 else if (s->s2->rbuf_offs != 0)
 310                         {
 311                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
 312                                 (unsigned int)newb);
 313                         s->s2->rbuf_offs=0;
 314                         }
 315                 s->s2->rbuf_left=0;
 316                 }
 317         else
 318                 newb=0;
 319
 320         /* off is the offset to start writing too.
 321          * r->s2->rbuf_offs is the 'unread data', now 0.
 322          * newb is the number of new bytes so far
 323          */
 324         s->packet=s->s2->rbuf;
 325         while (newb < (int)n)
 326                 {
 327                 clear_sys_error();
 328                 if (s->rbio != NULL)
 329                         {
 330                         s->rwstate=SSL_READING;
 331                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
 332                                 max-newb);
 333                         }
 334                 else
 335                         {
 336                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
 337                         i= -1;
 338                         }
 339 #ifdef PKT_DEBUG
 340                 if (s->debug & 0x01) sleep(1);
 341 #endif
 342                 if (i <= 0)
 343                         {
 344                         s->s2->rbuf_left+=newb;
 345                         return(i);
 346                         }
 347                 newb+=i;
 348                 }
 349
 350         /* record unread data */
 351         if (newb > (int)n)
 352                 {
 353                 s->s2->rbuf_offs=n+off;
 354                 s->s2->rbuf_left=newb-n;
 355                 }
 356         else
 357                 {
 358                 s->s2->rbuf_offs=0;
 359                 s->s2->rbuf_left=0;
 360                 }
 361         if (extend)
 362                 s->packet_length+=n;
 363         else
 364                 s->packet_length=n;
 365         s->rwstate=SSL_NOTHING;
 366         return(n);
 367         }
 368
 369 int ssl2_write(SSL *s, const void *_buf, int len)
 370         {
 371         const unsigned char *buf=_buf;
 372         unsigned int n,tot;
 373         int i;
 374
 375         if (SSL_in_init(s) && !s->in_handshake)
 376                 {
 377                 i=s->handshake_func(s);
 378                 if (i < 0) return(i);
 379                 if (i == 0)
 380                         {
 381                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
 382                         return(-1);
 383                         }
 384                 }
 385
 386         if (s->error)
 387                 {
 388                 ssl2_write_error(s);
 389                 if (s->error)
 390                         return(-1);
 391                 }
 392
 393         clear_sys_error();
 394         s->rwstate=SSL_NOTHING;
 395         if (len <= 0) return(len);
 396
 397         tot=s->s2->wnum;
 398         s->s2->wnum=0;
 399
 400         n=(len-tot);
 401         for (;;)
 402                 {
 403                 i=do_ssl_write(s,&(buf[tot]),n);
 404                 if (i <= 0)
 405                         {
 406                         s->s2->wnum=tot;
 407                         return(i);
 408                         }
 409                 if (i == (int)n) return(tot+i);
 410
 411                 n-=i;
 412                 tot+=i;
 413                 }
 414         }
 415
 416 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
 417         {
 418         int i;
 419
 420         /* s->s2->wpend_len != 0 MUST be true. */
 421
 422         /* check that they have given us the same buffer to
 423          * write */
 424         if ((s->s2->wpend_tot > (int)len) || (s->s2->wpend_buf != buf))
 425                 {
 426                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 427                 return(-1);
 428                 }
 429
 430         for (;;)
 431                 {
 432                 clear_sys_error();
 433                 if (s->wbio != NULL)
 434                         {
 435                         s->rwstate=SSL_WRITING;
 436                         i=BIO_write(s->wbio,
 437                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
 438                                 (unsigned int)s->s2->wpend_len);
 439                         }
 440                 else
 441                         {
 442                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
 443                         i= -1;
 444                         }
 445 #ifdef PKT_DEBUG
 446                 if (s->debug & 0x01) sleep(1);
 447 #endif
 448                 if (i == s->s2->wpend_len)
 449                         {
 450                         s->s2->wpend_len=0;
 451                         s->rwstate=SSL_NOTHING;
 452                         return(s->s2->wpend_ret);
 453                         }
 454                 else if (i <= 0)
 455                         return(i);
 456                 s->s2->wpend_off+=i;
 457                 s->s2->wpend_len-=i;
 458                 }
 459         }
 460
 461 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
 462         {
 463         unsigned int j,k,olen,p,mac_size,bs;
 464         register unsigned char *pp;
 465
 466         olen=len;
 467
 468         /* first check if there is data from an encryption waiting to
 469          * be sent - it must be sent because the other end is waiting.
 470          * This will happen with non-blocking IO.  We print it and then
 471          * return.
 472          */
 473         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
 474
 475         /* set mac_size to mac size */
 476         if (s->s2->clear_text)
 477                 mac_size=0;
 478         else
 479                 mac_size=EVP_MD_size(s->write_hash);
 480
 481         /* lets set the pad p */
 482         if (s->s2->clear_text)
 483                 {
 484                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 485                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 486                 p=0;
 487                 s->s2->three_byte_header=0;
 488                 /* len=len; */
 489                 }
 490         else
 491                 {
 492                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
 493                 j=len+mac_size;
 494                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
 495                         (!s->s2->escape))
 496                         {
 497                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
 498                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
 499                         /* set k to the max number of bytes with 2
 500                          * byte header */
 501                         k=j-(j%bs);
 502                         /* how many data bytes? */
 503                         len=k-mac_size;
 504                         s->s2->three_byte_header=0;
 505                         p=0;
 506                         }
 507                 else if ((bs <= 1) && (!s->s2->escape))
 508                         {
 509                         /* len=len; */
 510                         s->s2->three_byte_header=0;
 511                         p=0;
 512                         }
 513                 else /* 3 byte header */
 514                         {
 515                         /*len=len; */
 516                         p=(j%bs);
 517                         p=(p == 0)?0:(bs-p);
 518                         if (s->s2->escape)
 519                                 s->s2->three_byte_header=1;
 520                         else
 521                                 s->s2->three_byte_header=(p == 0)?0:1;
 522                         }
 523                 }
 524         /* mac_size is the number of MAC bytes
 525          * len is the number of data bytes we are going to send
 526          * p is the number of padding bytes
 527          * if p == 0, it is a 2 byte header */
 528
 529         s->s2->wlength=len;
 530         s->s2->padding=p;
 531         s->s2->mac_data= &(s->s2->wbuf[3]);
 532         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
 533         /* we copy the data into s->s2->wbuf */
 534         memcpy(s->s2->wact_data,buf,len);
 535 #ifdef PURIFY
 536         if (p)
 537                 memset(&(s->s2->wact_data[len]),0,p);
 538 #endif
 539
 540         if (!s->s2->clear_text)
 541                 {
 542                 s->s2->wact_data_length=len+p;
 543                 ssl2_mac(s,s->s2->mac_data,1);
 544                 s->s2->wlength+=p+mac_size;
 545                 ssl2_enc(s,1);
 546                 }
 547
 548         /* package up the header */
 549         s->s2->wpend_len=s->s2->wlength;
 550         if (s->s2->three_byte_header) /* 3 byte header */
 551                 {
 552                 pp=s->s2->mac_data;
 553                 pp-=3;
 554                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
 555                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
 556                 pp[1]=s->s2->wlength&0xff;
 557                 pp[2]=s->s2->padding;
 558                 s->s2->wpend_len+=3;
 559                 }
 560         else
 561                 {
 562                 pp=s->s2->mac_data;
 563                 pp-=2;
 564                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
 565                 pp[1]=s->s2->wlength&0xff;
 566                 s->s2->wpend_len+=2;
 567                 }
 568         s->s2->write_ptr=pp;
 569
 570         INC32(s->s2->write_sequence); /* expect next number */
 571
 572         /* lets try to actually write the data */
 573         s->s2->wpend_tot=olen;
 574         s->s2->wpend_buf=buf;
 575
 576         s->s2->wpend_ret=len;
 577
 578         s->s2->wpend_off=0;
 579         return(write_pending(s,buf,olen));
 580         }
 581
 582 int ssl2_part_read(SSL *s, unsigned long f, int i)
 583         {
 584         unsigned char *p;
 585         int j;
 586
 587         /* check for error */
 588         if ((s->init_num == 0) && (i >= 3))
 589                 {
 590                 p=(unsigned char *)s->init_buf->data;
 591                 if (p[0] == SSL2_MT_ERROR)
 592                         {
 593                         j=(p[1]<<8)|p[2];
 594                         SSLerr((int)f,ssl_mt_error(j));
 595                         }
 596                 }
 597
 598         if (i < 0)
 599                 {
 600                 /* ssl2_return_error(s); */
 601                 /* for non-blocking io,
 602                  * this is not fatal */
 603                 return(i);
 604                 }
 605         else
 606                 {
 607                 s->init_num+=i;
 608                 return(0);
 609                 }
 610         }
 611
 612 int ssl2_do_write(SSL *s)
 613         {
 614         int ret;
 615
 616         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
 617         if (ret == s->init_num)
 618                 return(1);
 619         if (ret < 0)
 620                 return(-1);
 621         s->init_off+=ret;
 622         s->init_num-=ret;
 623         return(0);
 624         }
 625
 626 static int ssl_mt_error(int n)
 627         {
 628         int ret;
 629
 630         switch (n)
 631                 {
 632         case SSL2_PE_NO_CIPHER:
 633                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
 634                 break;
 635         case SSL2_PE_NO_CERTIFICATE:
 636                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
 637                 break;
 638         case SSL2_PE_BAD_CERTIFICATE:
 639                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
 640                 break;
 641         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
 642                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
 643                 break;
 644         default:
 645                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
 646                 break;
 647                 }
 648         return(ret);
 649         }