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  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include <errno.h>
 114 #define USE_SOCKETS
 115 #include "ssl_locl.h"
 116 #include <openssl/evp.h>
 117 #include <openssl/buffer.h>
 118
 119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 120                          unsigned int len, int create_empty_fragment);
 121 static int ssl3_get_record(SSL *s);
 122
 123 int ssl3_read_n(SSL *s, int n, int max, int extend)
 124         {
 125         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
 126          * packet by another n bytes.
 127          * The packet will be in the sub-array of s->s3->rbuf.buf specified
 128          * by s->packet and s->packet_length.
 129          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
 130          * [plus s->packet_length bytes if extend == 1].)
 131          */
 132         int i,len,left;
 133         long align=0;
 134         unsigned char *pkt;
 135         SSL3_BUFFER *rb;
 136
 137         if (n <= 0) return n;
 138
 139         rb    = &(s->s3->rbuf);
 140         left  = rb->left;
 141 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 142         align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
 143         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 144 #endif
 145
 146         if (!extend)
 147                 {
 148                 /* start with empty packet ... */
 149                 if (left == 0)
 150                         rb->offset = align;
 151                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
 152                         {
 153                         /* check if next packet length is large
 154                          * enough to justify payload alignment... */
 155                         pkt = rb->buf + rb->offset;
 156                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
 157                             && (pkt[3]<<8|pkt[4]) >= 128)
 158                                 {
 159                                 /* Note that even if packet is corrupted
 160                                  * and its length field is insane, we can
 161                                  * only be led to wrong decision about
 162                                  * whether memmove will occur or not.
 163                                  * Header values has no effect on memmove
 164                                  * arguments and therefore no buffer
 165                                  * overrun can be triggered. */
 166                                 memmove (rb->buf+align,pkt,left);
 167                                 rb->offset = align;
 168                                 }
 169                         }
 170                 s->packet = rb->buf + rb->offset;
 171                 s->packet_length = 0;
 172                 /* ... now we can act as if 'extend' was set */
 173                 }
 174
 175         /* extend reads should not span multiple packets for DTLS */
 176         if ( SSL_version(s) == DTLS1_VERSION &&
 177                 extend)
 178                 {
 179                 if ( left > 0 && n > left)
 180                         n = left;
 181                 }
 182
 183         /* if there is enough in the buffer from a previous read, take some */
 184         if (left >= n)
 185                 {
 186                 s->packet_length+=n;
 187                 rb->left=left-n;
 188                 rb->offset+=n;
 189                 return(n);
 190                 }
 191
 192         /* else we need to read more data */
 193
 194         len = s->packet_length;
 195         pkt = rb->buf+align;
 196         /* Move any available bytes to front of buffer:
 197          * 'len' bytes already pointed to by 'packet',
 198          * 'left' extra ones at the end */
 199         if (s->packet != pkt) /* len > 0 */
 200                 {
 201                 memmove(pkt, s->packet, len+left);
 202                 s->packet = pkt;
 203                 rb->offset = len + align;
 204                 }
 205
 206         max = rb->len - rb->offset;
 207         if (n > max) /* does not happen */
 208                 {
 209                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 210                 return -1;
 211                 }
 212
 213         if (!s->read_ahead)
 214                 max=n;
 215
 216         while (left < n)
 217                 {
 218                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
 219                  * and need to read in more until we have len+n (up to
 220                  * len+max if possible) */
 221
 222                 clear_sys_error();
 223                 if (s->rbio != NULL)
 224                         {
 225                         s->rwstate=SSL_READING;
 226                         i=BIO_read(s->rbio,pkt+len+left, max-left);
 227                         }
 228                 else
 229                         {
 230                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 231                         i = -1;
 232                         }
 233
 234                 if (i <= 0)
 235                         {
 236                         rb->left = left;
 237                         return(i);
 238                         }
 239                 left+=i;
 240                 }
 241
 242         /* done reading, now the book-keeping */
 243         rb->offset += n;
 244         rb->left = left - n;
 245         s->packet_length += n;
 246         s->rwstate=SSL_NOTHING;
 247         return(n);
 248         }
 249
 250 /* Call this to get a new input record.
 251  * It will return <= 0 if more data is needed, normally due to an error
 252  * or non-blocking IO.
 253  * When it finishes, one packet has been decoded and can be found in
 254  * ssl->s3->rrec.type    - is the type of record
 255  * ssl->s3->rrec.data,   - data
 256  * ssl->s3->rrec.length, - number of bytes
 257  */
 258 /* used only by ssl3_read_bytes */
 259 static int ssl3_get_record(SSL *s)
 260         {
 261         int ssl_major,ssl_minor,al;
 262         int enc_err,n,i,ret= -1;
 263         SSL3_RECORD *rr;
 264         SSL_SESSION *sess;
 265         unsigned char *p;
 266         unsigned char md[EVP_MAX_MD_SIZE];
 267         short version;
 268         unsigned int mac_size;
 269         int clear=0;
 270         size_t extra;
 271         int decryption_failed_or_bad_record_mac = 0;
 272         unsigned char *mac = NULL;
 273
 274         rr= &(s->s3->rrec);
 275         sess=s->session;
 276
 277         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 278                 extra=SSL3_RT_MAX_EXTRA;
 279         else
 280                 extra=0;
 281         if (extra && !s->s3->init_extra)
 282                 {
 283                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 284                  * set after ssl3_setup_buffers() was done */
 285                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 286                 return -1;
 287                 }
 288
 289 again:
 290         /* check if we have the header */
 291         if (    (s->rstate != SSL_ST_READ_BODY) ||
 292                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 293                 {
 294                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 295                 if (n <= 0) return(n); /* error or non-blocking */
 296                 s->rstate=SSL_ST_READ_BODY;
 297
 298                 p=s->packet;
 299
 300                 /* Pull apart the header into the SSL3_RECORD */
 301                 rr->type= *(p++);
 302                 ssl_major= *(p++);
 303                 ssl_minor= *(p++);
 304                 version=(ssl_major<<8)|ssl_minor;
 305                 n2s(p,rr->length);
 306 #if 0
 307 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
 308 #endif
 309
 310                 /* Lets check version */
 311                 if (!s->first_packet)
 312                         {
 313                         if (version != s->version)
 314                                 {
 315                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 316                                 /* Send back error using their
 317                                  * version number :-) */
 318                                 s->version=version;
 319                                 al=SSL_AD_PROTOCOL_VERSION;
 320                                 goto f_err;
 321                                 }
 322                         }
 323
 324                 if ((version>>8) != SSL3_VERSION_MAJOR)
 325                         {
 326                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 327                         goto err;
 328                         }
 329
 330                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
 331                         {
 332                         al=SSL_AD_RECORD_OVERFLOW;
 333                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 334                         goto f_err;
 335                         }
 336
 337                 /* now s->rstate == SSL_ST_READ_BODY */
 338                 }
 339
 340         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 341
 342         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 343                 {
 344                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 345                 i=rr->length;
 346                 n=ssl3_read_n(s,i,i,1);
 347                 if (n <= 0) return(n); /* error or non-blocking io */
 348                 /* now n == rr->length,
 349                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 350                 }
 351
 352         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 353
 354         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 355          * and we have that many bytes in s->packet
 356          */
 357         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 358
 359         /* ok, we can now read from 's->packet' data into 'rr'
 360          * rr->input points at rr->length bytes, which
 361          * need to be copied into rr->data by either
 362          * the decryption or by the decompression
 363          * When the data is 'copied' into the rr->data buffer,
 364          * rr->input will be pointed at the new buffer */
 365
 366         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 367          * rr->length bytes of encrypted compressed stuff. */
 368
 369         /* check is not needed I believe */
 370         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 371                 {
 372                 al=SSL_AD_RECORD_OVERFLOW;
 373                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 374                 goto f_err;
 375                 }
 376
 377         /* decrypt in place in 'rr->input' */
 378         rr->data=rr->input;
 379
 380         enc_err = s->method->ssl3_enc->enc(s,0);
 381         if (enc_err <= 0)
 382                 {
 383                 if (enc_err == 0)
 384                         /* SSLerr() and ssl3_send_alert() have been called */
 385                         goto err;
 386
 387                 /* Otherwise enc_err == -1, which indicates bad padding
 388                  * (rec->length has not been changed in this case).
 389                  * To minimize information leaked via timing, we will perform
 390                  * the MAC computation anyway. */
 391                 decryption_failed_or_bad_record_mac = 1;
 392                 }
 393
 394 #ifdef TLS_DEBUG
 395 printf("dec %d\n",rr->length);
 396 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 397 printf("\n");
 398 #endif
 399
 400         /* r->length is now the compressed data plus mac */
 401         if (    (sess == NULL) ||
 402                 (s->enc_read_ctx == NULL) ||
 403                 (EVP_MD_CTX_md(s->read_hash) == NULL))
 404                 clear=1;
 405
 406         if (!clear)
 407                 {
 408                 mac_size=EVP_MD_CTX_size(s->read_hash);
 409
 410                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 411                         {
 412 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 413                         al=SSL_AD_RECORD_OVERFLOW;
 414                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 415                         goto f_err;
 416 #else
 417                         decryption_failed_or_bad_record_mac = 1;
 418 #endif
 419                         }
 420                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 421                 if (rr->length >= mac_size)
 422                         {
 423                         rr->length -= mac_size;
 424                         mac = &rr->data[rr->length];
 425                         }
 426                 else
 427                         {
 428                         /* record (minus padding) is too short to contain a MAC */
 429 #if 0 /* OK only for stream ciphers */
 430                         al=SSL_AD_DECODE_ERROR;
 431                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 432                         goto f_err;
 433 #else
 434                         decryption_failed_or_bad_record_mac = 1;
 435                         rr->length = 0;
 436 #endif
 437                         }
 438                 i=s->method->ssl3_enc->mac(s,md,0);
 439                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 440                         {
 441                         decryption_failed_or_bad_record_mac = 1;
 442                         }
 443                 }
 444
 445         if (decryption_failed_or_bad_record_mac)
 446                 {
 447                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 448                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 449                  * failure is directly visible from the ciphertext anyway,
 450                  * we should not reveal which kind of error occured -- this
 451                  * might become visible to an attacker (e.g. via a logfile) */
 452                 al=SSL_AD_BAD_RECORD_MAC;
 453                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 454                 goto f_err;
 455                 }
 456
 457         /* r->length is now just compressed */
 458         if (s->expand != NULL)
 459                 {
 460                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 461                         {
 462                         al=SSL_AD_RECORD_OVERFLOW;
 463                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 464                         goto f_err;
 465                         }
 466                 if (!ssl3_do_uncompress(s))
 467                         {
 468                         al=SSL_AD_DECOMPRESSION_FAILURE;
 469                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 470                         goto f_err;
 471                         }
 472                 }
 473
 474         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 475                 {
 476                 al=SSL_AD_RECORD_OVERFLOW;
 477                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 478                 goto f_err;
 479                 }
 480
 481         rr->off=0;
 482         /* So at this point the following is true
 483          * ssl->s3->rrec.type   is the type of record
 484          * ssl->s3->rrec.length == number of bytes in record
 485          * ssl->s3->rrec.off    == offset to first valid byte
 486          * ssl->s3->rrec.data   == where to take bytes from, increment
 487          *                         after use :-).
 488          */
 489
 490         /* we have pulled in a full packet so zero things */
 491         s->packet_length=0;
 492
 493         /* just read a 0 length packet */
 494         if (rr->length == 0) goto again;
 495
 496 #if 0
 497 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
 498 #endif
 499
 500         return(1);
 501
 502 f_err:
 503         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 504 err:
 505         return(ret);
 506         }
 507
 508 int ssl3_do_uncompress(SSL *ssl)
 509         {
 510 #ifndef OPENSSL_NO_COMP
 511         int i;
 512         SSL3_RECORD *rr;
 513
 514         rr= &(ssl->s3->rrec);
 515         i=COMP_expand_block(ssl->expand,rr->comp,
 516                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 517         if (i < 0)
 518                 return(0);
 519         else
 520                 rr->length=i;
 521         rr->data=rr->comp;
 522 #endif
 523         return(1);
 524         }
 525
 526 int ssl3_do_compress(SSL *ssl)
 527         {
 528 #ifndef OPENSSL_NO_COMP
 529         int i;
 530         SSL3_RECORD *wr;
 531
 532         wr= &(ssl->s3->wrec);
 533         i=COMP_compress_block(ssl->compress,wr->data,
 534                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 535                 wr->input,(int)wr->length);
 536         if (i < 0)
 537                 return(0);
 538         else
 539                 wr->length=i;
 540
 541         wr->input=wr->data;
 542 #endif
 543         return(1);
 544         }
 545
 546 /* Call this to write data in records of type 'type'
 547  * It will return <= 0 if not all data has been sent or non-blocking IO.
 548  */
 549 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 550         {
 551         const unsigned char *buf=buf_;
 552         unsigned int tot,n,nw;
 553         int i;
 554
 555         s->rwstate=SSL_NOTHING;
 556         tot=s->s3->wnum;
 557         s->s3->wnum=0;
 558
 559         if (SSL_in_init(s) && !s->in_handshake)
 560                 {
 561                 i=s->handshake_func(s);
 562                 if (i < 0) return(i);
 563                 if (i == 0)
 564                         {
 565                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 566                         return -1;
 567                         }
 568                 }
 569
 570         n=(len-tot);
 571         for (;;)
 572                 {
 573                 if (n > s->max_send_fragment)
 574                         nw=s->max_send_fragment;
 575                 else
 576                         nw=n;
 577
 578                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 579                 if (i <= 0)
 580                         {
 581                         s->s3->wnum=tot;
 582                         return i;
 583                         }
 584
 585                 if ((i == (int)n) ||
 586                         (type == SSL3_RT_APPLICATION_DATA &&
 587                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 588                         {
 589                         /* next chunk of data should get another prepended empty fragment
 590                          * in ciphersuites with known-IV weakness: */
 591                         s->s3->empty_fragment_done = 0;
 592
 593                         return tot+i;
 594                         }
 595
 596                 n-=i;
 597                 tot+=i;
 598                 }
 599         }
 600
 601 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 602                          unsigned int len, int create_empty_fragment)
 603         {
 604         unsigned char *p,*plen;
 605         int i,mac_size,clear=0;
 606         int prefix_len=0;
 607         long align=0;
 608         SSL3_RECORD *wr;
 609         SSL3_BUFFER *wb=&(s->s3->wbuf);
 610         SSL_SESSION *sess;
 611
 612         /* first check if there is a SSL3_BUFFER still being written
 613          * out.  This will happen with non blocking IO */
 614         if (wb->left != 0)
 615                 return(ssl3_write_pending(s,type,buf,len));
 616
 617         /* If we have an alert to send, lets send it */
 618         if (s->s3->alert_dispatch)
 619                 {
 620                 i=s->method->ssl_dispatch_alert(s);
 621                 if (i <= 0)
 622                         return(i);
 623                 /* if it went, fall through and send more stuff */
 624                 }
 625
 626         if (len == 0 && !create_empty_fragment)
 627                 return 0;
 628
 629         wr= &(s->s3->wrec);
 630         sess=s->session;
 631
 632         if (    (sess == NULL) ||
 633                 (s->enc_write_ctx == NULL) ||
 634                 (EVP_MD_CTX_md(s->write_hash) == NULL))
 635                 clear=1;
 636
 637         if (clear)
 638                 mac_size=0;
 639         else
 640                 mac_size=EVP_MD_CTX_size(s->write_hash);
 641
 642         /* 'create_empty_fragment' is true only when this function calls itself */
 643         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 644                 {
 645                 /* countermeasure against known-IV weakness in CBC ciphersuites
 646                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 647
 648                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 649                         {
 650                         /* recursive function call with 'create_empty_fragment' set;
 651                          * this prepares and buffers the data for an empty fragment
 652                          * (these 'prefix_len' bytes are sent out later
 653                          * together with the actual payload) */
 654                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 655                         if (prefix_len <= 0)
 656                                 goto err;
 657
 658                         if (prefix_len >
 659                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
 660                                 {
 661                                 /* insufficient space */
 662                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 663                                 goto err;
 664                                 }
 665                         }
 666
 667                 s->s3->empty_fragment_done = 1;
 668                 }
 669
 670         if (create_empty_fragment)
 671                 {
 672 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 673                 /* extra fragment would be couple of cipher blocks,
 674                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
 675                  * if we want to align the real payload, then we can
 676                  * just pretent we simply have two headers. */
 677                 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
 678                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 679 #endif
 680                 p = wb->buf + align;
 681                 wb->offset  = align;
 682                 }
 683         else if (prefix_len)
 684                 {
 685                 p = wb->buf + wb->offset + prefix_len;
 686                 }
 687         else
 688                 {
 689 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 690                 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
 691                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 692 #endif
 693                 p = wb->buf + align;
 694                 wb->offset  = align;
 695                 }
 696
 697         /* write the header */
 698
 699         *(p++)=type&0xff;
 700         wr->type=type;
 701
 702         *(p++)=(s->version>>8);
 703         *(p++)=s->version&0xff;
 704
 705         /* field where we are to write out packet length */
 706         plen=p;
 707         p+=2;
 708
 709         /* lets setup the record stuff. */
 710         wr->data=p;
 711         wr->length=(int)len;
 712         wr->input=(unsigned char *)buf;
 713
 714         /* we now 'read' from wr->input, wr->length bytes into
 715          * wr->data */
 716
 717         /* first we compress */
 718         if (s->compress != NULL)
 719                 {
 720                 if (!ssl3_do_compress(s))
 721                         {
 722                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 723                         goto err;
 724                         }
 725                 }
 726         else
 727                 {
 728                 memcpy(wr->data,wr->input,wr->length);
 729                 wr->input=wr->data;
 730                 }
 731
 732         /* we should still have the output to wr->data and the input
 733          * from wr->input.  Length should be wr->length.
 734          * wr->data still points in the wb->buf */
 735
 736         if (mac_size != 0)
 737                 {
 738                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 739                 wr->length+=mac_size;
 740                 wr->input=p;
 741                 wr->data=p;
 742                 }
 743
 744         /* ssl3_enc can only have an error on read */
 745         s->method->ssl3_enc->enc(s,1);
 746
 747         /* record length after mac and block padding */
 748         s2n(wr->length,plen);
 749
 750         /* we should now have
 751          * wr->data pointing to the encrypted data, which is
 752          * wr->length long */
 753         wr->type=type; /* not needed but helps for debugging */
 754         wr->length+=SSL3_RT_HEADER_LENGTH;
 755
 756         if (create_empty_fragment)
 757                 {
 758                 /* we are in a recursive call;
 759                  * just return the length, don't write out anything here
 760                  */
 761                 return wr->length;
 762                 }
 763
 764         /* now let's set up wb */
 765         wb->left = prefix_len + wr->length;
 766
 767         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 768         s->s3->wpend_tot=len;
 769         s->s3->wpend_buf=buf;
 770         s->s3->wpend_type=type;
 771         s->s3->wpend_ret=len;
 772
 773         /* we now just need to write the buffer */
 774         return ssl3_write_pending(s,type,buf,len);
 775 err:
 776         return -1;
 777         }
 778
 779 /* if s->s3->wbuf.left != 0, we need to call this */
 780 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 781         unsigned int len)
 782         {
 783         int i;
 784         SSL3_BUFFER *wb=&(s->s3->wbuf);
 785
 786 /* XXXX */
 787         if ((s->s3->wpend_tot > (int)len)
 788                 || ((s->s3->wpend_buf != buf) &&
 789                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 790                 || (s->s3->wpend_type != type))
 791                 {
 792                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 793                 return(-1);
 794                 }
 795
 796         for (;;)
 797                 {
 798                 clear_sys_error();
 799                 if (s->wbio != NULL)
 800                         {
 801                         s->rwstate=SSL_WRITING;
 802                         i=BIO_write(s->wbio,
 803                                 (char *)&(wb->buf[wb->offset]),
 804                                 (unsigned int)wb->left);
 805                         }
 806                 else
 807                         {
 808                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 809                         i= -1;
 810                         }
 811                 if (i == wb->left)
 812                         {
 813                         wb->left=0;
 814                         wb->offset+=i;
 815                         s->rwstate=SSL_NOTHING;
 816                         return(s->s3->wpend_ret);
 817                         }
 818                 else if (i <= 0)
 819                         return(i);
 820                 wb->offset+=i;
 821                 wb->left-=i;
 822                 }
 823         }
 824
 825 /* Return up to 'len' payload bytes received in 'type' records.
 826  * 'type' is one of the following:
 827  *
 828  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 829  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 830  *   -  0 (during a shutdown, no data has to be returned)
 831  *
 832  * If we don't have stored data to work from, read a SSL/TLS record first
 833  * (possibly multiple records if we still don't have anything to return).
 834  *
 835  * This function must handle any surprises the peer may have for us, such as
 836  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 837  * a surprise, but handled as if it were), or renegotiation requests.
 838  * Also if record payloads contain fragments too small to process, we store
 839  * them until there is enough for the respective protocol (the record protocol
 840  * may use arbitrary fragmentation and even interleaving):
 841  *     Change cipher spec protocol
 842  *             just 1 byte needed, no need for keeping anything stored
 843  *     Alert protocol
 844  *             2 bytes needed (AlertLevel, AlertDescription)
 845  *     Handshake protocol
 846  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 847  *             to detect unexpected Client Hello and Hello Request messages
 848  *             here, anything else is handled by higher layers
 849  *     Application data protocol
 850  *             none of our business
 851  */
 852 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 853         {
 854         int al,i,j,ret;
 855         unsigned int n;
 856         SSL3_RECORD *rr;
 857         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 858
 859         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 860                 if (!ssl3_setup_buffers(s))
 861                         return(-1);
 862
 863         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 864             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 865                 {
 866                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 867                 return -1;
 868                 }
 869
 870         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 871                 /* (partially) satisfy request from storage */
 872                 {
 873                 unsigned char *src = s->s3->handshake_fragment;
 874                 unsigned char *dst = buf;
 875                 unsigned int k;
 876
 877                 /* peek == 0 */
 878                 n = 0;
 879                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 880                         {
 881                         *dst++ = *src++;
 882                         len--; s->s3->handshake_fragment_len--;
 883                         n++;
 884                         }
 885                 /* move any remaining fragment bytes: */
 886                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 887                         s->s3->handshake_fragment[k] = *src++;
 888                 return n;
 889         }
 890
 891         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 892
 893         if (!s->in_handshake && SSL_in_init(s))
 894                 {
 895                 /* type == SSL3_RT_APPLICATION_DATA */
 896                 i=s->handshake_func(s);
 897                 if (i < 0) return(i);
 898                 if (i == 0)
 899                         {
 900                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 901                         return(-1);
 902                         }
 903                 }
 904 start:
 905         s->rwstate=SSL_NOTHING;
 906
 907         /* s->s3->rrec.type         - is the type of record
 908          * s->s3->rrec.data,    - data
 909          * s->s3->rrec.off,     - offset into 'data' for next read
 910          * s->s3->rrec.length,  - number of bytes. */
 911         rr = &(s->s3->rrec);
 912
 913         /* get new packet if necessary */
 914         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 915                 {
 916                 ret=ssl3_get_record(s);
 917                 if (ret <= 0) return(ret);
 918                 }
 919
 920         /* we now have a packet which can be read and processed */
 921
 922         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 923                                        * reset by ssl3_get_finished */
 924                 && (rr->type != SSL3_RT_HANDSHAKE))
 925                 {
 926                 al=SSL_AD_UNEXPECTED_MESSAGE;
 927                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 928                 goto f_err;
 929                 }
 930
 931         /* If the other end has shut down, throw anything we read away
 932          * (even in 'peek' mode) */
 933         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 934                 {
 935                 rr->length=0;
 936                 s->rwstate=SSL_NOTHING;
 937                 return(0);
 938                 }
 939
 940
 941         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 942                 {
 943                 /* make sure that we are not getting application data when we
 944                  * are doing a handshake for the first time */
 945                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 946                         (s->enc_read_ctx == NULL))
 947                         {
 948                         al=SSL_AD_UNEXPECTED_MESSAGE;
 949                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 950                         goto f_err;
 951                         }
 952
 953                 if (len <= 0) return(len);
 954
 955                 if ((unsigned int)len > rr->length)
 956                         n = rr->length;
 957                 else
 958                         n = (unsigned int)len;
 959
 960                 memcpy(buf,&(rr->data[rr->off]),n);
 961                 if (!peek)
 962                         {
 963                         rr->length-=n;
 964                         rr->off+=n;
 965                         if (rr->length == 0)
 966                                 {
 967                                 s->rstate=SSL_ST_READ_HEADER;
 968                                 rr->off=0;
 969                                 }
 970                         }
 971                 return(n);
 972                 }
 973
 974
 975         /* If we get here, then type != rr->type; if we have a handshake
 976          * message, then it was unexpected (Hello Request or Client Hello). */
 977
 978         /* In case of record types for which we have 'fragment' storage,
 979          * fill that so that we can process the data at a fixed place.
 980          */
 981                 {
 982                 unsigned int dest_maxlen = 0;
 983                 unsigned char *dest = NULL;
 984                 unsigned int *dest_len = NULL;
 985
 986                 if (rr->type == SSL3_RT_HANDSHAKE)
 987                         {
 988                         dest_maxlen = sizeof s->s3->handshake_fragment;
 989                         dest = s->s3->handshake_fragment;
 990                         dest_len = &s->s3->handshake_fragment_len;
 991                         }
 992                 else if (rr->type == SSL3_RT_ALERT)
 993                         {
 994                         dest_maxlen = sizeof s->s3->alert_fragment;
 995                         dest = s->s3->alert_fragment;
 996                         dest_len = &s->s3->alert_fragment_len;
 997                         }
 998
 999                 if (dest_maxlen > 0)
1000                         {
1001                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1002                         if (rr->length < n)
1003                                 n = rr->length; /* available bytes */
1004
1005                         /* now move 'n' bytes: */
1006                         while (n-- > 0)
1007                                 {
1008                                 dest[(*dest_len)++] = rr->data[rr->off++];
1009                                 rr->length--;
1010                                 }
1011
1012                         if (*dest_len < dest_maxlen)
1013                                 goto start; /* fragment was too small */
1014                         }
1015                 }
1016
1017         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1018          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1019          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1020
1021         /* If we are a client, check for an incoming 'Hello Request': */
1022         if ((!s->server) &&
1023                 (s->s3->handshake_fragment_len >= 4) &&
1024                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1025                 (s->session != NULL) && (s->session->cipher != NULL))
1026                 {
1027                 s->s3->handshake_fragment_len = 0;
1028
1029                 if ((s->s3->handshake_fragment[1] != 0) ||
1030                         (s->s3->handshake_fragment[2] != 0) ||
1031                         (s->s3->handshake_fragment[3] != 0))
1032                         {
1033                         al=SSL_AD_DECODE_ERROR;
1034                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1035                         goto f_err;
1036                         }
1037
1038                 if (s->msg_callback)
1039                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1040
1041                 if (SSL_is_init_finished(s) &&
1042                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1043                         !s->s3->renegotiate)
1044                         {
1045                         ssl3_renegotiate(s);
1046                         if (ssl3_renegotiate_check(s))
1047                                 {
1048                                 i=s->handshake_func(s);
1049                                 if (i < 0) return(i);
1050                                 if (i == 0)
1051                                         {
1052                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1053                                         return(-1);
1054                                         }
1055
1056                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1057                                         {
1058                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1059                                                 {
1060                                                 BIO *bio;
1061                                                 /* In the case where we try to read application data,
1062                                                  * but we trigger an SSL handshake, we return -1 with
1063                                                  * the retry option set.  Otherwise renegotiation may
1064                                                  * cause nasty problems in the blocking world */
1065                                                 s->rwstate=SSL_READING;
1066                                                 bio=SSL_get_rbio(s);
1067                                                 BIO_clear_retry_flags(bio);
1068                                                 BIO_set_retry_read(bio);
1069                                                 return(-1);
1070                                                 }
1071                                         }
1072                                 }
1073                         }
1074                 /* we either finished a handshake or ignored the request,
1075                  * now try again to obtain the (application) data we were asked for */
1076                 goto start;
1077                 }
1078
1079         if (s->s3->alert_fragment_len >= 2)
1080                 {
1081                 int alert_level = s->s3->alert_fragment[0];
1082                 int alert_descr = s->s3->alert_fragment[1];
1083
1084                 s->s3->alert_fragment_len = 0;
1085
1086                 if (s->msg_callback)
1087                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1088
1089                 if (s->info_callback != NULL)
1090                         cb=s->info_callback;
1091                 else if (s->ctx->info_callback != NULL)
1092                         cb=s->ctx->info_callback;
1093
1094                 if (cb != NULL)
1095                         {
1096                         j = (alert_level << 8) | alert_descr;
1097                         cb(s, SSL_CB_READ_ALERT, j);
1098                         }
1099
1100                 if (alert_level == 1) /* warning */
1101                         {
1102                         s->s3->warn_alert = alert_descr;
1103                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1104                                 {
1105                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1106                                 return(0);
1107                                 }
1108                         }
1109                 else if (alert_level == 2) /* fatal */
1110                         {
1111                         char tmp[16];
1112
1113                         s->rwstate=SSL_NOTHING;
1114                         s->s3->fatal_alert = alert_descr;
1115                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1116                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1117                         ERR_add_error_data(2,"SSL alert number ",tmp);
1118                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1119                         SSL_CTX_remove_session(s->ctx,s->session);
1120                         return(0);
1121                         }
1122                 else
1123                         {
1124                         al=SSL_AD_ILLEGAL_PARAMETER;
1125                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1126                         goto f_err;
1127                         }
1128
1129                 goto start;
1130                 }
1131
1132         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1133                 {
1134                 s->rwstate=SSL_NOTHING;
1135                 rr->length=0;
1136                 return(0);
1137                 }
1138
1139         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1140                 {
1141                 /* 'Change Cipher Spec' is just a single byte, so we know
1142                  * exactly what the record payload has to look like */
1143                 if (    (rr->length != 1) || (rr->off != 0) ||
1144                         (rr->data[0] != SSL3_MT_CCS))
1145                         {
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1148                         goto f_err;
1149                         }
1150
1151                 /* Check we have a cipher to change to */
1152                 if (s->s3->tmp.new_cipher == NULL)
1153                         {
1154                         al=SSL_AD_UNEXPECTED_MESSAGE;
1155                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1156                         goto f_err;
1157                         }
1158
1159                 rr->length=0;
1160
1161                 if (s->msg_callback)
1162                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1163
1164                 s->s3->change_cipher_spec=1;
1165                 if (!ssl3_do_change_cipher_spec(s))
1166                         goto err;
1167                 else
1168                         goto start;
1169                 }
1170
1171         /* Unexpected handshake message (Client Hello, or protocol violation) */
1172         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1173                 {
1174                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1175                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1176                         {
1177 #if 0 /* worked only because C operator preferences are not as expected (and
1178        * because this is not really needed for clients except for detecting
1179        * protocol violations): */
1180                         s->state=SSL_ST_BEFORE|(s->server)
1181                                 ?SSL_ST_ACCEPT
1182                                 :SSL_ST_CONNECT;
1183 #else
1184                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1185 #endif
1186                         s->new_session=1;
1187                         }
1188                 i=s->handshake_func(s);
1189                 if (i < 0) return(i);
1190                 if (i == 0)
1191                         {
1192                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1193                         return(-1);
1194                         }
1195
1196                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1197                         {
1198                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1199                                 {
1200                                 BIO *bio;
1201                                 /* In the case where we try to read application data,
1202                                  * but we trigger an SSL handshake, we return -1 with
1203                                  * the retry option set.  Otherwise renegotiation may
1204                                  * cause nasty problems in the blocking world */
1205                                 s->rwstate=SSL_READING;
1206                                 bio=SSL_get_rbio(s);
1207                                 BIO_clear_retry_flags(bio);
1208                                 BIO_set_retry_read(bio);
1209                                 return(-1);
1210                                 }
1211                         }
1212                 goto start;
1213                 }
1214
1215         switch (rr->type)
1216                 {
1217         default:
1218 #ifndef OPENSSL_NO_TLS
1219                 /* TLS just ignores unknown message types */
1220                 if (s->version == TLS1_VERSION)
1221                         {
1222                         rr->length = 0;
1223                         goto start;
1224                         }
1225 #endif
1226                 al=SSL_AD_UNEXPECTED_MESSAGE;
1227                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1228                 goto f_err;
1229         case SSL3_RT_CHANGE_CIPHER_SPEC:
1230         case SSL3_RT_ALERT:
1231         case SSL3_RT_HANDSHAKE:
1232                 /* we already handled all of these, with the possible exception
1233                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1234                  * should not happen when type != rr->type */
1235                 al=SSL_AD_UNEXPECTED_MESSAGE;
1236                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1237                 goto f_err;
1238         case SSL3_RT_APPLICATION_DATA:
1239                 /* At this point, we were expecting handshake data,
1240                  * but have application data.  If the library was
1241                  * running inside ssl3_read() (i.e. in_read_app_data
1242                  * is set) and it makes sense to read application data
1243                  * at this point (session renegotiation not yet started),
1244                  * we will indulge it.
1245                  */
1246                 if (s->s3->in_read_app_data &&
1247                         (s->s3->total_renegotiations != 0) &&
1248                         ((
1249                                 (s->state & SSL_ST_CONNECT) &&
1250                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1251                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1252                                 ) || (
1253                                         (s->state & SSL_ST_ACCEPT) &&
1254                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1255                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1256                                         )
1257                                 ))
1258                         {
1259                         s->s3->in_read_app_data=2;
1260                         return(-1);
1261                         }
1262                 else
1263                         {
1264                         al=SSL_AD_UNEXPECTED_MESSAGE;
1265                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1266                         goto f_err;
1267                         }
1268                 }
1269         /* not reached */
1270
1271 f_err:
1272         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1273 err:
1274         return(-1);
1275         }
1276
1277 int ssl3_do_change_cipher_spec(SSL *s)
1278         {
1279         int i;
1280         const char *sender;
1281         int slen;
1282
1283         if (s->state & SSL_ST_ACCEPT)
1284                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1285         else
1286                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1287
1288         if (s->s3->tmp.key_block == NULL)
1289                 {
1290                 s->session->cipher=s->s3->tmp.new_cipher;
1291                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1292                 }
1293
1294         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1295                 return(0);
1296
1297         /* we have to record the message digest at
1298          * this point so we can get it before we read
1299          * the finished message */
1300         if (s->state & SSL_ST_CONNECT)
1301                 {
1302                 sender=s->method->ssl3_enc->server_finished_label;
1303                 slen=s->method->ssl3_enc->server_finished_label_len;
1304                 }
1305         else
1306                 {
1307                 sender=s->method->ssl3_enc->client_finished_label;
1308                 slen=s->method->ssl3_enc->client_finished_label_len;
1309                 }
1310
1311         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1312                 sender,slen,s->s3->tmp.peer_finish_md);
1313
1314         return(1);
1315         }
1316
1317 void ssl3_send_alert(SSL *s, int level, int desc)
1318         {
1319         /* Map tls/ssl alert value to correct one */
1320         desc=s->method->ssl3_enc->alert_value(desc);
1321         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1322                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1323         if (desc < 0) return;
1324         /* If a fatal one, remove from cache */
1325         if ((level == 2) && (s->session != NULL))
1326                 SSL_CTX_remove_session(s->ctx,s->session);
1327
1328         s->s3->alert_dispatch=1;
1329         s->s3->send_alert[0]=level;
1330         s->s3->send_alert[1]=desc;
1331         if (s->s3->wbuf.left == 0) /* data still being written out? */
1332                 s->method->ssl_dispatch_alert(s);
1333         /* else data is still being written out, we will get written
1334          * some time in the future */
1335         }
1336
1337 int ssl3_dispatch_alert(SSL *s)
1338         {
1339         int i,j;
1340         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1341
1342         s->s3->alert_dispatch=0;
1343         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1344         if (i <= 0)
1345                 {
1346                 s->s3->alert_dispatch=1;
1347                 }
1348         else
1349                 {
1350                 /* Alert sent to BIO.  If it is important, flush it now.
1351                  * If the message does not get sent due to non-blocking IO,
1352                  * we will not worry too much. */
1353                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1354                         (void)BIO_flush(s->wbio);
1355
1356                 if (s->msg_callback)
1357                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1358
1359                 if (s->info_callback != NULL)
1360                         cb=s->info_callback;
1361                 else if (s->ctx->info_callback != NULL)
1362                         cb=s->ctx->info_callback;
1363
1364                 if (cb != NULL)
1365                         {
1366                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1367                         cb(s,SSL_CB_WRITE_ALERT,j);
1368                         }
1369                 }
1370         return(i);
1371         }