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