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