ssl/s3_pkt.c

   1 /* ssl/s3_pkt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #define USE_SOCKETS
  62 #include "evp.h"
  63 #include "buffer.h"
  64 #include "ssl_locl.h"
  65
  66 /* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CIPHER);
  67  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CERTIFICATE);
  68  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_CERTIFICATE);
  69  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
  70  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNKNOWN_REMOTE_ERROR_TYPE);
  71  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNEXPECTED_MESSAGE);
  72  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_RECORD_MAC);
  73  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_DECOMPRESSION_FAILURE);
  74  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE);
  75  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_NO_CERTIFICATE);
  76  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_CERTIFICATE);
  77  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNSUPPORTED_CERTIFICATE);
  78  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_REVOKED);
  79  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_EXPIRED);
  80  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN);
  81  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_ILLEGAL_PARAMETER);
  82  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_DECRYPTION_FAILED);
  83  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_RECORD_OVERFLOW);
  84  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_UNKNOWN_CA);
  85  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_ACCESS_DENIED);
  86  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_DECODE_ERROR);
  87  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_DECRYPT_ERROR);
  88  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_EXPORT_RESTRICION);
  89  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_PROTOCOL_VERSION);
  90  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_INSUFFICIENT_SECURITY);
  91  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_INTERNAL_ERROR);
  92  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_USER_CANCLED);
  93  * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_TLSV1_ALERT_NO_RENEGOTIATION);
  94  */
  95
  96 #ifndef NOPROTO
  97 static int do_ssl3_write(SSL *s, int type, const char *buf, unsigned int len);
  98 static int ssl3_write_pending(SSL *s, int type, const char *buf,
  99                               unsigned int len);
 100 static int ssl3_get_record(SSL *s);
 101 static int do_compress(SSL *ssl);
 102 static int do_uncompress(SSL *ssl);
 103 static int do_change_cipher_spec(SSL *ssl);
 104 #else
 105 static int do_ssl3_write();
 106 static int ssl3_write_pending();
 107 static int ssl3_get_record();
 108 static int do_compress();
 109 static int do_uncompress();
 110 static int do_change_cipher_spec();
 111 #endif
 112
 113 static int ssl3_read_n(s,n,max,extend)
 114 SSL *s;
 115 int n;
 116 int max;
 117 int extend;
 118         {
 119         int i,off,newb;
 120
 121         /* if there is stuff still in the buffer from a previous read,
 122          * and there is more than we want, take some. */
 123         if (s->s3->rbuf.left >= (int)n)
 124                 {
 125                 if (extend)
 126                         s->packet_length+=n;
 127                 else
 128                         {
 129                         s->packet= &(s->s3->rbuf.buf[s->s3->rbuf.offset]);
 130                         s->packet_length=n;
 131                         }
 132                 s->s3->rbuf.left-=n;
 133                 s->s3->rbuf.offset+=n;
 134                 return(n);
 135                 }
 136
 137         /* else we need to read more data */
 138         if (!s->read_ahead) max=n;
 139         if (max > SSL3_RT_MAX_PACKET_SIZE)
 140                 max=SSL3_RT_MAX_PACKET_SIZE;
 141
 142         /* First check if there is some left or we want to extend */
 143         off=0;
 144         if (    (s->s3->rbuf.left != 0) ||
 145                 ((s->packet_length != 0) && extend))
 146                 {
 147                 newb=s->s3->rbuf.left;
 148                 if (extend)
 149                         {
 150                         /* Copy bytes back to the front of the buffer
 151                          * Take the bytes already pointed to by 'packet'
 152                          * and take the extra ones on the end. */
 153                         off=s->packet_length;
 154                         if (s->packet != s->s3->rbuf.buf)
 155                                 memcpy(s->s3->rbuf.buf,s->packet,newb+off);
 156                         }
 157                 else if (s->s3->rbuf.offset != 0)
 158                         { /* so the data is not at the start of the buffer */
 159                         memcpy(s->s3->rbuf.buf,
 160                                 &(s->s3->rbuf.buf[s->s3->rbuf.offset]),newb);
 161                         s->s3->rbuf.offset=0;
 162                         }
 163
 164                 s->s3->rbuf.left=0;
 165                 }
 166         else
 167                 newb=0;
 168
 169         /* So we now have 'newb' bytes at the front of
 170          * s->s3->rbuf.buf and need to read some more in on the end
 171          * We start reading into the buffer at 's->s3->rbuf.offset'
 172          */
 173         s->packet=s->s3->rbuf.buf;
 174
 175         while (newb < n)
 176                 {
 177                 clear_sys_error();
 178                 if (s->rbio != NULL)
 179                         {
 180                         s->rwstate=SSL_READING;
 181                         i=BIO_read(s->rbio,
 182                                 (char *)&(s->s3->rbuf.buf[off+newb]),
 183                                 max-newb);
 184                         }
 185                 else
 186                         {
 187                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 188                         i= -1;
 189                         }
 190
 191                 if (i <= 0)
 192                         {
 193                         s->s3->rbuf.left+=newb;
 194                         return(i);
 195                         }
 196                 newb+=i;
 197                 }
 198
 199         /* record used data read */
 200         if (newb > n)
 201                 {
 202                 s->s3->rbuf.offset=n+off;
 203                 s->s3->rbuf.left=newb-n;
 204                 }
 205         else
 206                 {
 207                 s->s3->rbuf.offset=0;
 208                 s->s3->rbuf.left=0;
 209                 }
 210
 211         if (extend)
 212                 s->packet_length+=n;
 213         else
 214                 s->packet_length+=n;
 215         return(n);
 216         }
 217
 218 /* Call this to get a new input record.
 219  * It will return <= 0 if more data is needed, normally due to an error
 220  * or non-blocking IO.
 221  * When it finishes, one packet has been decoded and can be found in
 222  * ssl->s3->rrec.type   - is the type of record
 223  * ssl->s3->rrec.data,  - data
 224  * ssl->s3->rrec.length, - number of bytes
 225  */
 226 static int ssl3_get_record(s)
 227 SSL *s;
 228         {
 229         int ssl_major,ssl_minor,al;
 230         int n,i,ret= -1;
 231         SSL3_BUFFER *rb;
 232         SSL3_RECORD *rr;
 233         SSL_SESSION *sess;
 234         unsigned char *p;
 235         unsigned char md[EVP_MAX_MD_SIZE];
 236         short version;
 237         unsigned int mac_size;
 238         int clear=0,extra;
 239
 240         rr= &(s->s3->rrec);
 241         rb= &(s->s3->rbuf);
 242         sess=s->session;
 243
 244         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 245                 extra=SSL3_RT_MAX_EXTRA;
 246         else
 247                 extra=0;
 248
 249 again:
 250         /* check if we have the header */
 251         if (    (s->rstate != SSL_ST_READ_BODY) ||
 252                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 253                 {
 254                 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
 255                         SSL3_RT_MAX_PACKET_SIZE,0);
 256                 if (n <= 0) return(n); /* error or non-blocking */
 257                 s->rstate=SSL_ST_READ_BODY;
 258
 259                 p=s->packet;
 260
 261                 /* Pull apart the header into the SSL3_RECORD */
 262                 rr->type= *(p++);
 263                 ssl_major= *(p++);
 264                 ssl_minor= *(p++);
 265                 version=(ssl_major<<8)|ssl_minor;
 266                 n2s(p,rr->length);
 267
 268                 /* Lets check version */
 269                 if (s->first_packet)
 270                         {
 271                         s->first_packet=0;
 272                         }
 273                 else
 274                         {
 275                         if (version != s->version)
 276                                 {
 277                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 278                                 /* Send back error using their
 279                                  * version number :-) */
 280                                 s->version=version;
 281                                 al=SSL_AD_PROTOCOL_VERSION;
 282                                 goto f_err;
 283                                 }
 284                         }
 285
 286                 if ((version>>8) != SSL3_VERSION_MAJOR)
 287                         {
 288                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 289                         goto err;
 290                         }
 291
 292                 if (rr->length >
 293                         (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 294                         {
 295                         al=SSL_AD_RECORD_OVERFLOW;
 296                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 297                         goto f_err;
 298                         }
 299
 300                 s->rstate=SSL_ST_READ_BODY;
 301                 }
 302
 303         /* get and decode the data */
 304         if (s->rstate == SSL_ST_READ_BODY)
 305                 {
 306                 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
 307                         {
 308                         i=rr->length;
 309                         /*-(s->packet_length-SSL3_RT_HEADER_LENGTH); */
 310                         n=ssl3_read_n(s,i,i,1);
 311                         if (n <= 0) return(n); /* error or non-blocking io */
 312                         }
 313                 s->rstate=SSL_ST_READ_HEADER;
 314                 }
 315
 316         /* At this point, we have the data in s->packet and there should be
 317          * s->packet_length bytes, we must not 'overrun' this buffer :-)
 318          * One of the following functions will copy the data from the
 319          * s->packet buffer */
 320
 321         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 322
 323         /* ok, we can now read from 's->packet' data into 'rr'
 324          * rr->input points at rr->length bytes, which
 325          * need to be copied into rr->data by either
 326          * the decryption or by the decompression
 327          * When the data is 'copied' into the rr->data buffer,
 328          * rr->input will be pointed at the new buffer */
 329
 330         /* Set the state for the following operations */
 331         s->rstate=SSL_ST_READ_HEADER;
 332
 333         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 334          * rr->length bytes of encrypted compressed stuff. */
 335
 336         /* check is not needed I belive */
 337         if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 338                 {
 339                 al=SSL_AD_RECORD_OVERFLOW;
 340                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 341                 goto f_err;
 342                 }
 343
 344         /* decrypt in place in 'rr->input' */
 345         rr->data=rr->input;
 346
 347         if (!s->method->ssl3_enc->enc(s,0))
 348                 {
 349                 al=SSL_AD_DECRYPT_ERROR;
 350                 goto f_err;
 351                 }
 352 #ifdef TLS_DEBUG
 353 printf("dec %d\n",rr->length);
 354 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 355 printf("\n");
 356 #endif
 357         /* r->length is now the compressed data plus mac */
 358         if (    (sess == NULL) ||
 359                 (s->enc_read_ctx == NULL) ||
 360                 (s->read_hash == NULL))
 361                 clear=1;
 362
 363         if (!clear)
 364                 {
 365                 mac_size=EVP_MD_size(s->read_hash);
 366
 367                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 368                         {
 369                         al=SSL_AD_RECORD_OVERFLOW;
 370                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 371                         goto f_err;
 372                         }
 373                 /* check MAC for rr->input' */
 374                 if (rr->length < mac_size)
 375                         {
 376                         al=SSL_AD_DECODE_ERROR;
 377                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 378                         goto f_err;
 379                         }
 380                 rr->length-=mac_size;
 381                 i=s->method->ssl3_enc->mac(s,md,0);
 382                 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
 383                         {
 384                         al=SSL_AD_BAD_RECORD_MAC;
 385                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
 386                         ret= -1;
 387                         goto f_err;
 388                         }
 389                 }
 390
 391         /* r->length is now just compressed */
 392         if (s->expand != NULL)
 393                 {
 394                 if (rr->length >
 395                         (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 396                         {
 397                         al=SSL_AD_RECORD_OVERFLOW;
 398                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 399                         goto f_err;
 400                         }
 401                 if (!do_uncompress(s))
 402                         {
 403                         al=SSL_AD_DECOMPRESSION_FAILURE;
 404                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 405                         goto f_err;
 406                         }
 407                 }
 408
 409         if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
 410                 {
 411                 al=SSL_AD_RECORD_OVERFLOW;
 412                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 413                 goto f_err;
 414                 }
 415
 416         rr->off=0;
 417         /* So at this point the following is true
 418          * ssl->s3->rrec.type   is the type of record
 419          * ssl->s3->rrec.length == number of bytes in record
 420          * ssl->s3->rrec.off    == offset to first valid byte
 421          * ssl->s3->rrec.data   == where to take bytes from, increment
 422          *                         after use :-).
 423          */
 424
 425         /* we have pulled in a full packet so zero things */
 426         s->packet_length=0;
 427
 428         /* just read a 0 length packet */
 429         if (rr->length == 0) goto again;
 430
 431         return(1);
 432 f_err:
 433         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 434 err:
 435         return(ret);
 436         }
 437
 438 static int do_uncompress(ssl)
 439 SSL *ssl;
 440         {
 441         int i;
 442         SSL3_RECORD *rr;
 443
 444         rr= &(ssl->s3->rrec);
 445         i=COMP_expand_block(ssl->expand,rr->comp,
 446                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 447         if (i < 0)
 448                 return(0);
 449         else
 450                 rr->length=i;
 451         rr->data=rr->comp;
 452
 453         return(1);
 454         }
 455
 456 static int do_compress(ssl)
 457 SSL *ssl;
 458         {
 459         int i;
 460         SSL3_RECORD *wr;
 461
 462         wr= &(ssl->s3->wrec);
 463         i=COMP_compress_block(ssl->compress,wr->data,
 464                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 465                 wr->input,(int)wr->length);
 466         if (i < 0)
 467                 return(0);
 468         else
 469                 wr->length=i;
 470
 471         wr->input=wr->data;
 472         return(1);
 473         }
 474
 475 /* Call this to write data
 476  * It will return <= 0 if not all data has been sent or non-blocking IO.
 477  */
 478 int ssl3_write_bytes(s,type,buf,len)
 479 SSL *s;
 480 int type;
 481 const char *buf;
 482 int len;
 483         {
 484         unsigned int tot,n,nw;
 485         int i;
 486
 487         s->rwstate=SSL_NOTHING;
 488         tot=s->s3->wnum;
 489         s->s3->wnum=0;
 490
 491         if (SSL_in_init(s) && !s->in_handshake)
 492                 {
 493                 i=s->handshake_func(s);
 494                 if (i < 0) return(i);
 495                 if (i == 0)
 496                         {
 497                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 498                         return(-1);
 499                         }
 500                 }
 501
 502         n=(len-tot);
 503         for (;;)
 504                 {
 505                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
 506                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
 507                 else
 508                         nw=n;
 509
 510                 i=do_ssl3_write(s,type,&(buf[tot]),nw);
 511                 if (i <= 0)
 512                         {
 513                         s->s3->wnum=tot;
 514                         return(i);
 515                         }
 516
 517                 if (type == SSL3_RT_HANDSHAKE)
 518                         ssl3_finish_mac(s,&(buf[tot]),i);
 519
 520                 if (i == (int)n) return(tot+i);
 521
 522                 n-=i;
 523                 tot+=i;
 524                 }
 525         }
 526
 527 static int do_ssl3_write(s,type,buf,len)
 528 SSL *s;
 529 int type;
 530 const char *buf;
 531 unsigned int len;
 532         {
 533         unsigned char *p,*plen;
 534         int i,mac_size,clear=0;
 535         SSL3_RECORD *wr;
 536         SSL3_BUFFER *wb;
 537         SSL_SESSION *sess;
 538
 539         /* first check is there is a SSL3_RECORD still being written
 540          * out.  This will happen with non blocking IO */
 541         if (s->s3->wbuf.left != 0)
 542                 return(ssl3_write_pending(s,type,buf,len));
 543
 544         /* If we have an alert to send, lets send it */
 545         if (s->s3->alert_dispatch)
 546                 {
 547                 i=ssl3_dispatch_alert(s);
 548                 if (i <= 0)
 549                         return(i);
 550                 /* if it went, fall through and send more stuff */
 551                 }
 552
 553         if (len <= 0) return(len);
 554
 555         wr= &(s->s3->wrec);
 556         wb= &(s->s3->wbuf);
 557         sess=s->session;
 558
 559         if (    (sess == NULL) ||
 560                 (s->enc_write_ctx == NULL) ||
 561                 (s->write_hash == NULL))
 562                 clear=1;
 563
 564         if (clear)
 565                 mac_size=0;
 566         else
 567                 mac_size=EVP_MD_size(s->write_hash);
 568
 569         p=wb->buf;
 570
 571         /* write the header */
 572         *(p++)=type&0xff;
 573         wr->type=type;
 574
 575         *(p++)=(s->version>>8);
 576         *(p++)=s->version&0xff;
 577
 578         /* record where we are to write out packet length */
 579         plen=p;
 580         p+=2;
 581
 582         /* lets setup the record stuff. */
 583         wr->data=p;
 584         wr->length=(int)len;
 585         wr->input=(unsigned char *)buf;
 586
 587         /* we now 'read' from wr->input, wr->length bytes into
 588          * wr->data */
 589
 590         /* first we compress */
 591         if (s->compress != NULL)
 592                 {
 593                 if (!do_compress(s))
 594                         {
 595                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 596                         goto err;
 597                         }
 598                 }
 599         else
 600                 {
 601                 memcpy(wr->data,wr->input,wr->length);
 602                 wr->input=wr->data;
 603                 }
 604
 605         /* we should still have the output to wr->data and the input
 606          * from wr->input.  Length should be wr->length.
 607          * wr->data still points in the wb->buf */
 608
 609         if (mac_size != 0)
 610                 {
 611                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 612                 wr->length+=mac_size;
 613                 wr->input=p;
 614                 wr->data=p;
 615                 }
 616
 617         /* ssl3_enc can only have an error on read */
 618         s->method->ssl3_enc->enc(s,1);
 619
 620         /* record length after mac and block padding */
 621         s2n(wr->length,plen);
 622
 623         /* we should now have
 624          * wr->data pointing to the encrypted data, which is
 625          * wr->length long */
 626         wr->type=type; /* not needed but helps for debugging */
 627         wr->length+=SSL3_RT_HEADER_LENGTH;
 628
 629         /* Now lets setup wb */
 630         wb->left=wr->length;
 631         wb->offset=0;
 632
 633         s->s3->wpend_tot=len;
 634         s->s3->wpend_buf=buf;
 635         s->s3->wpend_type=type;
 636         s->s3->wpend_ret=len;
 637
 638         /* we now just need to write the buffer */
 639         return(ssl3_write_pending(s,type,buf,len));
 640 err:
 641         return(-1);
 642         }
 643
 644 /* if s->s3->wbuf.left != 0, we need to call this */
 645 static int ssl3_write_pending(s,type,buf,len)
 646 SSL *s;
 647 int type;
 648 const char *buf;
 649 unsigned int len;
 650         {
 651         int i;
 652
 653 /* XXXX */
 654         if ((s->s3->wpend_tot > (int)len) || (s->s3->wpend_buf != buf)
 655                 || (s->s3->wpend_type != type))
 656                 {
 657                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 658                 return(-1);
 659                 }
 660
 661         for (;;)
 662                 {
 663                 clear_sys_error();
 664                 if (s->wbio != NULL)
 665                         {
 666                         s->rwstate=SSL_WRITING;
 667                         i=BIO_write(s->wbio,
 668                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
 669                                 (unsigned int)s->s3->wbuf.left);
 670                         }
 671                 else
 672                         {
 673                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 674                         i= -1;
 675                         }
 676                 if (i == s->s3->wbuf.left)
 677                         {
 678                         s->s3->wbuf.left=0;
 679                         s->rwstate=SSL_NOTHING;
 680                         return(s->s3->wpend_ret);
 681                         }
 682                 else if (i <= 0)
 683                         return(i);
 684                 s->s3->wbuf.offset+=i;
 685                 s->s3->wbuf.left-=i;
 686                 }
 687         }
 688
 689 int ssl3_read_bytes(s,type,buf,len)
 690 SSL *s;
 691 int type;
 692 char *buf;
 693 int len;
 694         {
 695         int al,i,j,n,ret;
 696         SSL3_RECORD *rr;
 697         void (*cb)()=NULL;
 698         BIO *bio;
 699
 700         if (s->s3->rbuf.buf == NULL) /* Not initialize yet */
 701                 if (!ssl3_setup_buffers(s))
 702                         return(-1);
 703
 704         if (!s->in_handshake && SSL_in_init(s))
 705                 {
 706                 i=s->handshake_func(s);
 707                 if (i < 0) return(i);
 708                 if (i == 0)
 709                         {
 710                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 711                         return(-1);
 712                         }
 713                 }
 714 start:
 715         s->rwstate=SSL_NOTHING;
 716
 717         /* s->s3->rrec.type     - is the type of record
 718          * s->s3->rrec.data,    - data
 719          * s->s3->rrec.off,     - ofset into 'data' for next read
 720          * s->s3->rrec.length,  - number of bytes. */
 721         rr= &(s->s3->rrec);
 722
 723         /* get new packet */
 724         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 725                 {
 726                 ret=ssl3_get_record(s);
 727                 if (ret <= 0) return(ret);
 728                 }
 729
 730         /* we now have a packet which can be read and processed */
 731
 732         if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
 733                 {
 734                 al=SSL_AD_UNEXPECTED_MESSAGE;
 735                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 736                 goto err;
 737                 }
 738
 739         /* If the other end has shutdown, throw anything we read away */
 740         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 741                 {
 742                 rr->length=0;
 743                 s->rwstate=SSL_NOTHING;
 744                 return(0);
 745                 }
 746
 747         /* Check for an incoming 'Client Request' message */
 748         if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
 749                 (rr->data[0] == SSL3_MT_CLIENT_REQUEST) &&
 750                 (s->session != NULL) && (s->session->cipher != NULL))
 751                 {
 752                 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
 753                         (rr->data[3] != 0))
 754                         {
 755                         al=SSL_AD_DECODE_ERROR;
 756                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CLIENT_REQUEST);
 757                         goto err;
 758                         }
 759
 760                 if (SSL_is_init_finished(s) &&
 761                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
 762                         !s->s3->renegotiate)
 763                         {
 764                         ssl3_renegotiate(s);
 765                         if (ssl3_renegotiate_check(s))
 766                                 {
 767                                 n=s->handshake_func(s);
 768                                 if (n < 0) return(n);
 769                                 if (n == 0)
 770                                         {
 771                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 772                                         return(-1);
 773                                         }
 774                                 }
 775                         }
 776                 rr->length=0;
 777 /* ZZZ */       goto start;
 778                 }
 779
 780         /* if it is not the type we want, or we have shutdown and want
 781          * the peer shutdown */
 782         if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
 783                 {
 784                 if (rr->type == SSL3_RT_ALERT)
 785                         {
 786                         if ((rr->length != 2) || (rr->off != 0))
 787                                 {
 788                                 al=SSL_AD_DECODE_ERROR;
 789                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
 790                                 goto f_err;
 791                                 }
 792
 793                         i=rr->data[0];
 794                         n=rr->data[1];
 795
 796                         /* clear from buffer */
 797                         rr->length=0;
 798
 799                         if (s->info_callback != NULL)
 800                                 cb=s->info_callback;
 801                         else if (s->ctx->info_callback != NULL)
 802                                 cb=s->ctx->info_callback;
 803
 804                         if (cb != NULL)
 805                                 {
 806                                 j=(i<<8)|n;
 807                                 cb(s,SSL_CB_READ_ALERT,j);
 808                                 }
 809
 810                         if (i == 1)
 811                                 {
 812                                 s->s3->warn_alert=n;
 813                                 if (n == SSL_AD_CLOSE_NOTIFY)
 814                                         {
 815                                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 816                                         return(0);
 817                                         }
 818                                 }
 819                         else if (i == 2)
 820                                 {
 821                                 char tmp[16];
 822
 823                                 s->rwstate=SSL_NOTHING;
 824                                 s->s3->fatal_alert=n;
 825                                 SSLerr(SSL_F_SSL3_READ_BYTES,
 826                                         SSL_AD_REASON_OFFSET+n);
 827                                 sprintf(tmp,"%d",n);
 828                                 ERR_add_error_data(2,"SSL alert number ",tmp);
 829                                 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
 830                                 SSL_CTX_remove_session(s->ctx,s->session);
 831                                 return(0);
 832                                 }
 833                         else
 834                                 {
 835                                 al=SSL_AD_ILLEGAL_PARAMETER;
 836                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
 837                                 goto f_err;
 838                                 }
 839
 840                         rr->length=0;
 841                         goto start;
 842                         }
 843
 844                 if (s->shutdown & SSL_SENT_SHUTDOWN)
 845                         {
 846                         s->rwstate=SSL_NOTHING;
 847                         rr->length=0;
 848                         return(0);
 849                         }
 850
 851                 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
 852                         {
 853                         if (    (rr->length != 1) || (rr->off != 0) ||
 854                                 (rr->data[0] != SSL3_MT_CCS))
 855                                 {
 856                                 i=SSL_AD_ILLEGAL_PARAMETER;
 857                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
 858                                 goto err;
 859                                 }
 860
 861                         rr->length=0;
 862                         s->s3->change_cipher_spec=1;
 863                         if (!do_change_cipher_spec(s))
 864                                 goto err;
 865                         else
 866                                 goto start;
 867                         }
 868
 869                 /* else we have a handshake */
 870                 if ((rr->type == SSL3_RT_HANDSHAKE) &&
 871                         !s->in_handshake)
 872                         {
 873                         if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
 874                                 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
 875                                 {
 876                                 s->state=SSL_ST_BEFORE|(s->server)
 877                                                 ?SSL_ST_ACCEPT
 878                                                 :SSL_ST_CONNECT;
 879                                 s->new_session=1;
 880                                 }
 881                         n=s->handshake_func(s);
 882                         if (n < 0) return(n);
 883                         if (n == 0)
 884                                 {
 885                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 886                                 return(-1);
 887                                 }
 888
 889                         /* In the case where we try to read application data
 890                          * the first time, but we trigger an SSL handshake, we
 891                          * return -1 with the retry option set.  I do this
 892                          * otherwise renegotiation can cause nasty problems
 893                          * in the non-blocking world */
 894
 895                         s->rwstate=SSL_READING;
 896                         bio=SSL_get_rbio(s);
 897                         BIO_clear_retry_flags(bio);
 898                         BIO_set_retry_read(bio);
 899                         return(-1);
 900                         }
 901
 902                 switch (rr->type)
 903                         {
 904                 default:
 905 #ifndef NO_TLS
 906                         /* TLS just ignores unknown message types */
 907                         if (s->version == TLS1_VERSION)
 908                                 {
 909                                 goto start;
 910                                 }
 911 #endif
 912                 case SSL3_RT_CHANGE_CIPHER_SPEC:
 913                 case SSL3_RT_ALERT:
 914                 case SSL3_RT_HANDSHAKE:
 915                         al=SSL_AD_UNEXPECTED_MESSAGE;
 916                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 917                         goto f_err;
 918                 case SSL3_RT_APPLICATION_DATA:
 919                         /* At this point, we were expecting something else,
 920                          * but have application data.  What we do is set the
 921                          * error, and return -1.  On the way out, if the
 922                          * library was running inside ssl3_read() and it makes
 923                          * sense to read application data at this point, we
 924                          * will indulge it.  This will mostly happen during
 925                          * session renegotiation.
 926                          */
 927                         if (s->s3->in_read_app_data &&
 928                                 (s->s3->total_renegotiations != 0) &&
 929                                 ((
 930                                   (s->state & SSL_ST_CONNECT) &&
 931                                   (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
 932                                   (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
 933                                  ) || (
 934                                   (s->state & SSL_ST_ACCEPT) &&
 935                                   (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
 936                                   (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
 937                                  )
 938                                 ))
 939                                 {
 940                                 s->s3->in_read_app_data=0;
 941                                 return(-1);
 942                                 }
 943                         else
 944                                 {
 945                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 946                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
 947                                 goto f_err;
 948                                 }
 949                         }
 950                 }
 951
 952         /* make sure that we are not getting application data when we
 953          * are doing a handshake for the first time */
 954         if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 955                 (s->enc_read_ctx == NULL))
 956                 {
 957                 al=SSL_AD_UNEXPECTED_MESSAGE;
 958                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 959                 goto f_err;
 960                 }
 961
 962         if (len <= 0) return(len);
 963
 964         if ((unsigned int)len > rr->length)
 965                 n=rr->length;
 966         else
 967                 n=len;
 968
 969         memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
 970         rr->length-=n;
 971         rr->off+=n;
 972         if (rr->length <= 0)
 973                 {
 974                 s->rstate=SSL_ST_READ_HEADER;
 975                 rr->off=0;
 976                 }
 977
 978         if (type == SSL3_RT_HANDSHAKE)
 979                 ssl3_finish_mac(s,buf,n);
 980         return(n);
 981 f_err:
 982         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 983 err:
 984         return(-1);
 985         }
 986
 987 static int do_change_cipher_spec(s)
 988 SSL *s;
 989         {
 990         int i;
 991         unsigned char *sender;
 992         int slen;
 993
 994         if (s->state & SSL_ST_ACCEPT)
 995                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
 996         else
 997                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
 998
 999         if (s->s3->tmp.key_block == NULL)
1000                 {
1001                 s->session->cipher=s->s3->tmp.new_cipher;
1002                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1003                 }
1004
1005         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1006                 return(0);
1007
1008         /* we have to record the message digest at
1009          * this point so we can get it before we read
1010          * the finished message */
1011         if (s->state & SSL_ST_CONNECT)
1012                 {
1013                 sender=s->method->ssl3_enc->server_finished;
1014                 slen=s->method->ssl3_enc->server_finished_len;
1015                 }
1016         else
1017                 {
1018                 sender=s->method->ssl3_enc->client_finished;
1019                 slen=s->method->ssl3_enc->client_finished_len;
1020                 }
1021
1022         s->method->ssl3_enc->final_finish_mac(s,
1023                 &(s->s3->finish_dgst1),
1024                 &(s->s3->finish_dgst2),
1025                 sender,slen,&(s->s3->tmp.finish_md[0]));
1026
1027         return(1);
1028         }
1029
1030 int ssl3_do_write(s,type)
1031 SSL *s;
1032 int type;
1033         {
1034         int ret;
1035
1036         ret=ssl3_write_bytes(s,type,(char *)
1037                 &(s->init_buf->data[s->init_off]),s->init_num);
1038         if (ret == s->init_num)
1039                 return(1);
1040         if (ret < 0) return(-1);
1041         s->init_off+=ret;
1042         s->init_num-=ret;
1043         return(0);
1044         }
1045
1046 void ssl3_send_alert(s,level,desc)
1047 SSL *s;
1048 int level;
1049 int desc;
1050         {
1051         /* Map tls/ssl alert value to correct one */
1052         desc=s->method->ssl3_enc->alert_value(desc);
1053         if (desc < 0) return;
1054         /* If a fatal one, remove from cache */
1055         if ((level == 2) && (s->session != NULL))
1056                 SSL_CTX_remove_session(s->ctx,s->session);
1057
1058         s->s3->alert_dispatch=1;
1059         s->s3->send_alert[0]=level;
1060         s->s3->send_alert[1]=desc;
1061         if (s->s3->wbuf.left == 0) /* data still being written out */
1062                 ssl3_dispatch_alert(s);
1063         /* else data is still being written out, we will get written
1064          * some time in the future */
1065         }
1066
1067 int ssl3_dispatch_alert(s)
1068 SSL *s;
1069         {
1070         int i,j;
1071         void (*cb)()=NULL;
1072
1073         s->s3->alert_dispatch=0;
1074         i=do_ssl3_write(s,SSL3_RT_ALERT,&(s->s3->send_alert[0]),2);
1075         if (i <= 0)
1076                 {
1077                 s->s3->alert_dispatch=1;
1078                 }
1079         else
1080                 {
1081                 /* If it is important, send it now.  If the message
1082                  * does not get sent due to non-blocking IO, we will
1083                  * not worry too much. */
1084                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1085                         BIO_flush(s->wbio);
1086
1087                 if (s->info_callback != NULL)
1088                         cb=s->info_callback;
1089                 else if (s->ctx->info_callback != NULL)
1090                         cb=s->ctx->info_callback;
1091
1092                 if (cb != NULL)
1093                         {
1094                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1095                         cb(s,SSL_CB_WRITE_ALERT,j);
1096                         }
1097                 }
1098         return(i);
1099         }
1100