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         if (rb->buf == NULL)
 141                 if (!ssl3_setup_read_buffer(s))
 142                         return -1;
 143
 144         left  = rb->left;
 145 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 146         align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
 147         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 148 #endif
 149
 150         if (!extend)
 151                 {
 152                 /* start with empty packet ... */
 153                 if (left == 0)
 154                         rb->offset = align;
 155                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
 156                         {
 157                         /* check if next packet length is large
 158                          * enough to justify payload alignment... */
 159                         pkt = rb->buf + rb->offset;
 160                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
 161                             && (pkt[3]<<8|pkt[4]) >= 128)
 162                                 {
 163                                 /* Note that even if packet is corrupted
 164                                  * and its length field is insane, we can
 165                                  * only be led to wrong decision about
 166                                  * whether memmove will occur or not.
 167                                  * Header values has no effect on memmove
 168                                  * arguments and therefore no buffer
 169                                  * overrun can be triggered. */
 170                                 memmove (rb->buf+align,pkt,left);
 171                                 rb->offset = align;
 172                                 }
 173                         }
 174                 s->packet = rb->buf + rb->offset;
 175                 s->packet_length = 0;
 176                 /* ... now we can act as if 'extend' was set */
 177                 }
 178
 179         /* extend reads should not span multiple packets for DTLS */
 180         if ( SSL_version(s) == DTLS1_VERSION &&
 181                 extend)
 182                 {
 183                 if ( left > 0 && n > left)
 184                         n = left;
 185                 }
 186
 187         /* if there is enough in the buffer from a previous read, take some */
 188         if (left >= n)
 189                 {
 190                 s->packet_length+=n;
 191                 rb->left=left-n;
 192                 rb->offset+=n;
 193                 return(n);
 194                 }
 195
 196         /* else we need to read more data */
 197
 198         len = s->packet_length;
 199         pkt = rb->buf+align;
 200         /* Move any available bytes to front of buffer:
 201          * 'len' bytes already pointed to by 'packet',
 202          * 'left' extra ones at the end */
 203         if (s->packet != pkt) /* len > 0 */
 204                 {
 205                 memmove(pkt, s->packet, len+left);
 206                 s->packet = pkt;
 207                 rb->offset = len + align;
 208                 }
 209
 210         max = rb->len - rb->offset;
 211         if (n > max) /* does not happen */
 212                 {
 213                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 214                 return -1;
 215                 }
 216
 217         if (!s->read_ahead)
 218                 max=n;
 219
 220         while (left < n)
 221                 {
 222                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
 223                  * and need to read in more until we have len+n (up to
 224                  * len+max if possible) */
 225
 226                 clear_sys_error();
 227                 if (s->rbio != NULL)
 228                         {
 229                         s->rwstate=SSL_READING;
 230                         i=BIO_read(s->rbio,pkt+len+left, max-left);
 231                         }
 232                 else
 233                         {
 234                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 235                         i = -1;
 236                         }
 237
 238                 if (i <= 0)
 239                         {
 240                         rb->left = left;
 241                         if (s->mode & SSL_MODE_RELEASE_BUFFERS)
 242                                 if (len+left == 0)
 243                                         ssl3_release_read_buffer(s);
 244                         return(i);
 245                         }
 246                 left+=i;
 247                 }
 248
 249         /* done reading, now the book-keeping */
 250         rb->offset += n;
 251         rb->left = left - n;
 252         s->packet_length += n;
 253         s->rwstate=SSL_NOTHING;
 254         return(n);
 255         }
 256
 257 /* Call this to get a new input record.
 258  * It will return <= 0 if more data is needed, normally due to an error
 259  * or non-blocking IO.
 260  * When it finishes, one packet has been decoded and can be found in
 261  * ssl->s3->rrec.type    - is the type of record
 262  * ssl->s3->rrec.data,   - data
 263  * ssl->s3->rrec.length, - number of bytes
 264  */
 265 /* used only by ssl3_read_bytes */
 266 static int ssl3_get_record(SSL *s)
 267         {
 268         int ssl_major,ssl_minor,al;
 269         int enc_err,n,i,ret= -1;
 270         SSL3_RECORD *rr;
 271         SSL_SESSION *sess;
 272         unsigned char *p;
 273         unsigned char md[EVP_MAX_MD_SIZE];
 274         short version;
 275         unsigned int mac_size;
 276         int clear=0;
 277         size_t extra;
 278         int decryption_failed_or_bad_record_mac = 0;
 279         unsigned char *mac = NULL;
 280
 281         rr= &(s->s3->rrec);
 282         sess=s->session;
 283
 284         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 285                 extra=SSL3_RT_MAX_EXTRA;
 286         else
 287                 extra=0;
 288         if (extra && !s->s3->init_extra)
 289                 {
 290                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 291                  * set after ssl3_setup_buffers() was done */
 292                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 293                 return -1;
 294                 }
 295
 296 again:
 297         /* check if we have the header */
 298         if (    (s->rstate != SSL_ST_READ_BODY) ||
 299                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 300                 {
 301                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 302                 if (n <= 0) return(n); /* error or non-blocking */
 303                 s->rstate=SSL_ST_READ_BODY;
 304
 305                 p=s->packet;
 306
 307                 /* Pull apart the header into the SSL3_RECORD */
 308                 rr->type= *(p++);
 309                 ssl_major= *(p++);
 310                 ssl_minor= *(p++);
 311                 version=(ssl_major<<8)|ssl_minor;
 312                 n2s(p,rr->length);
 313 #if 0
 314 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
 315 #endif
 316
 317                 /* Lets check version */
 318                 if (!s->first_packet)
 319                         {
 320                         if (version != s->version)
 321                                 {
 322                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 323                                 /* Send back error using their
 324                                  * version number :-) */
 325                                 s->version=version;
 326                                 al=SSL_AD_PROTOCOL_VERSION;
 327                                 goto f_err;
 328                                 }
 329                         }
 330
 331                 if ((version>>8) != SSL3_VERSION_MAJOR)
 332                         {
 333                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 334                         goto err;
 335                         }
 336
 337                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
 338                         {
 339                         al=SSL_AD_RECORD_OVERFLOW;
 340                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 341                         goto f_err;
 342                         }
 343
 344                 /* now s->rstate == SSL_ST_READ_BODY */
 345                 }
 346
 347         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 348
 349         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 350                 {
 351                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 352                 i=rr->length;
 353                 n=ssl3_read_n(s,i,i,1);
 354                 if (n <= 0) return(n); /* error or non-blocking io */
 355                 /* now n == rr->length,
 356                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 357                 }
 358
 359         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 360
 361         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 362          * and we have that many bytes in s->packet
 363          */
 364         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 365
 366         /* ok, we can now read from 's->packet' data into 'rr'
 367          * rr->input points at rr->length bytes, which
 368          * need to be copied into rr->data by either
 369          * the decryption or by the decompression
 370          * When the data is 'copied' into the rr->data buffer,
 371          * rr->input will be pointed at the new buffer */
 372
 373         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 374          * rr->length bytes of encrypted compressed stuff. */
 375
 376         /* check is not needed I believe */
 377         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 378                 {
 379                 al=SSL_AD_RECORD_OVERFLOW;
 380                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 381                 goto f_err;
 382                 }
 383
 384         /* decrypt in place in 'rr->input' */
 385         rr->data=rr->input;
 386
 387         enc_err = s->method->ssl3_enc->enc(s,0);
 388         if (enc_err <= 0)
 389                 {
 390                 if (enc_err == 0)
 391                         /* SSLerr() and ssl3_send_alert() have been called */
 392                         goto err;
 393
 394                 /* Otherwise enc_err == -1, which indicates bad padding
 395                  * (rec->length has not been changed in this case).
 396                  * To minimize information leaked via timing, we will perform
 397                  * the MAC computation anyway. */
 398                 decryption_failed_or_bad_record_mac = 1;
 399                 }
 400
 401 #ifdef TLS_DEBUG
 402 printf("dec %d\n",rr->length);
 403 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 404 printf("\n");
 405 #endif
 406
 407         /* r->length is now the compressed data plus mac */
 408         if (    (sess == NULL) ||
 409                 (s->enc_read_ctx == NULL) ||
 410                 (EVP_MD_CTX_md(s->read_hash) == NULL))
 411                 clear=1;
 412
 413         if (!clear)
 414                 {
 415                 /* !clear => s->read_hash != NULL => mac_size != -1 */
 416                 mac_size=EVP_MD_CTX_size(s->read_hash);
 417
 418                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 419                         {
 420 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
 421                         al=SSL_AD_RECORD_OVERFLOW;
 422                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
 423                         goto f_err;
 424 #else
 425                         decryption_failed_or_bad_record_mac = 1;
 426 #endif
 427                         }
 428                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
 429                 if (rr->length >= mac_size)
 430                         {
 431                         rr->length -= mac_size;
 432                         mac = &rr->data[rr->length];
 433                         }
 434                 else
 435                         {
 436                         /* record (minus padding) is too short to contain a MAC */
 437 #if 0 /* OK only for stream ciphers */
 438                         al=SSL_AD_DECODE_ERROR;
 439                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 440                         goto f_err;
 441 #else
 442                         decryption_failed_or_bad_record_mac = 1;
 443                         rr->length = 0;
 444 #endif
 445                         }
 446                 i=s->method->ssl3_enc->mac(s,md,0);
 447                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
 448                         {
 449                         decryption_failed_or_bad_record_mac = 1;
 450                         }
 451                 }
 452
 453         if (decryption_failed_or_bad_record_mac)
 454                 {
 455                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 456                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 457                  * failure is directly visible from the ciphertext anyway,
 458                  * we should not reveal which kind of error occured -- this
 459                  * might become visible to an attacker (e.g. via a logfile) */
 460                 al=SSL_AD_BAD_RECORD_MAC;
 461                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 462                 goto f_err;
 463                 }
 464
 465         /* r->length is now just compressed */
 466         if (s->expand != NULL)
 467                 {
 468                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 469                         {
 470                         al=SSL_AD_RECORD_OVERFLOW;
 471                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 472                         goto f_err;
 473                         }
 474                 if (!ssl3_do_uncompress(s))
 475                         {
 476                         al=SSL_AD_DECOMPRESSION_FAILURE;
 477                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 478                         goto f_err;
 479                         }
 480                 }
 481
 482         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 483                 {
 484                 al=SSL_AD_RECORD_OVERFLOW;
 485                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 486                 goto f_err;
 487                 }
 488
 489         rr->off=0;
 490         /* So at this point the following is true
 491          * ssl->s3->rrec.type   is the type of record
 492          * ssl->s3->rrec.length == number of bytes in record
 493          * ssl->s3->rrec.off    == offset to first valid byte
 494          * ssl->s3->rrec.data   == where to take bytes from, increment
 495          *                         after use :-).
 496          */
 497
 498         /* we have pulled in a full packet so zero things */
 499         s->packet_length=0;
 500
 501         /* just read a 0 length packet */
 502         if (rr->length == 0) goto again;
 503
 504 #if 0
 505 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
 506 #endif
 507
 508         return(1);
 509
 510 f_err:
 511         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 512 err:
 513         return(ret);
 514         }
 515
 516 int ssl3_do_uncompress(SSL *ssl)
 517         {
 518 #ifndef OPENSSL_NO_COMP
 519         int i;
 520         SSL3_RECORD *rr;
 521
 522         rr= &(ssl->s3->rrec);
 523         i=COMP_expand_block(ssl->expand,rr->comp,
 524                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 525         if (i < 0)
 526                 return(0);
 527         else
 528                 rr->length=i;
 529         rr->data=rr->comp;
 530 #endif
 531         return(1);
 532         }
 533
 534 int ssl3_do_compress(SSL *ssl)
 535         {
 536 #ifndef OPENSSL_NO_COMP
 537         int i;
 538         SSL3_RECORD *wr;
 539
 540         wr= &(ssl->s3->wrec);
 541         i=COMP_compress_block(ssl->compress,wr->data,
 542                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 543                 wr->input,(int)wr->length);
 544         if (i < 0)
 545                 return(0);
 546         else
 547                 wr->length=i;
 548
 549         wr->input=wr->data;
 550 #endif
 551         return(1);
 552         }
 553
 554 /* Call this to write data in records of type 'type'
 555  * It will return <= 0 if not all data has been sent or non-blocking IO.
 556  */
 557 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 558         {
 559         const unsigned char *buf=buf_;
 560         unsigned int tot,n,nw;
 561         int i;
 562
 563         s->rwstate=SSL_NOTHING;
 564         tot=s->s3->wnum;
 565         s->s3->wnum=0;
 566
 567         if (SSL_in_init(s) && !s->in_handshake)
 568                 {
 569                 i=s->handshake_func(s);
 570                 if (i < 0) return(i);
 571                 if (i == 0)
 572                         {
 573                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 574                         return -1;
 575                         }
 576                 }
 577
 578         n=(len-tot);
 579         for (;;)
 580                 {
 581                 if (n > s->max_send_fragment)
 582                         nw=s->max_send_fragment;
 583                 else
 584                         nw=n;
 585
 586                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 587                 if (i <= 0)
 588                         {
 589                         s->s3->wnum=tot;
 590                         return i;
 591                         }
 592
 593                 if ((i == (int)n) ||
 594                         (type == SSL3_RT_APPLICATION_DATA &&
 595                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 596                         {
 597                         /* next chunk of data should get another prepended empty fragment
 598                          * in ciphersuites with known-IV weakness: */
 599                         s->s3->empty_fragment_done = 0;
 600
 601                         return tot+i;
 602                         }
 603
 604                 n-=i;
 605                 tot+=i;
 606                 }
 607         }
 608
 609 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 610                          unsigned int len, int create_empty_fragment)
 611         {
 612         unsigned char *p,*plen;
 613         int i,mac_size,clear=0;
 614         int prefix_len=0;
 615         long align=0;
 616         SSL3_RECORD *wr;
 617         SSL3_BUFFER *wb=&(s->s3->wbuf);
 618         SSL_SESSION *sess;
 619
 620         if (wb->buf == NULL)
 621                 if (!ssl3_setup_write_buffer(s))
 622                         return -1;
 623
 624         /* first check if there is a SSL3_BUFFER still being written
 625          * out.  This will happen with non blocking IO */
 626         if (wb->left != 0)
 627                 return(ssl3_write_pending(s,type,buf,len));
 628
 629         /* If we have an alert to send, lets send it */
 630         if (s->s3->alert_dispatch)
 631                 {
 632                 i=s->method->ssl_dispatch_alert(s);
 633                 if (i <= 0)
 634                         return(i);
 635                 /* if it went, fall through and send more stuff */
 636                 }
 637
 638         if (len == 0 && !create_empty_fragment)
 639                 return 0;
 640
 641         wr= &(s->s3->wrec);
 642         sess=s->session;
 643
 644         if (    (sess == NULL) ||
 645                 (s->enc_write_ctx == NULL) ||
 646                 (EVP_MD_CTX_md(s->write_hash) == NULL))
 647                 clear=1;
 648
 649         if (clear)
 650                 mac_size=0;
 651         else
 652                 mac_size=EVP_MD_CTX_size(s->write_hash);
 653
 654         /* 'create_empty_fragment' is true only when this function calls itself */
 655         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 656                 {
 657                 /* countermeasure against known-IV weakness in CBC ciphersuites
 658                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 659
 660                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 661                         {
 662                         /* recursive function call with 'create_empty_fragment' set;
 663                          * this prepares and buffers the data for an empty fragment
 664                          * (these 'prefix_len' bytes are sent out later
 665                          * together with the actual payload) */
 666                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 667                         if (prefix_len <= 0)
 668                                 goto err;
 669
 670                         if (prefix_len >
 671                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
 672                                 {
 673                                 /* insufficient space */
 674                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
 675                                 goto err;
 676                                 }
 677                         }
 678
 679                 s->s3->empty_fragment_done = 1;
 680                 }
 681
 682         if (create_empty_fragment)
 683                 {
 684 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 685                 /* extra fragment would be couple of cipher blocks,
 686                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
 687                  * if we want to align the real payload, then we can
 688                  * just pretent we simply have two headers. */
 689                 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
 690                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 691 #endif
 692                 p = wb->buf + align;
 693                 wb->offset  = align;
 694                 }
 695         else if (prefix_len)
 696                 {
 697                 p = wb->buf + wb->offset + prefix_len;
 698                 }
 699         else
 700                 {
 701 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 702                 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
 703                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 704 #endif
 705                 p = wb->buf + align;
 706                 wb->offset  = align;
 707                 }
 708
 709         /* write the header */
 710
 711         *(p++)=type&0xff;
 712         wr->type=type;
 713
 714         *(p++)=(s->version>>8);
 715         *(p++)=s->version&0xff;
 716
 717         /* field where we are to write out packet length */
 718         plen=p;
 719         p+=2;
 720
 721         /* lets setup the record stuff. */
 722         wr->data=p;
 723         wr->length=(int)len;
 724         wr->input=(unsigned char *)buf;
 725
 726         /* we now 'read' from wr->input, wr->length bytes into
 727          * wr->data */
 728
 729         /* first we compress */
 730         if (s->compress != NULL)
 731                 {
 732                 if (!ssl3_do_compress(s))
 733                         {
 734                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
 735                         goto err;
 736                         }
 737                 }
 738         else
 739                 {
 740                 memcpy(wr->data,wr->input,wr->length);
 741                 wr->input=wr->data;
 742                 }
 743
 744         /* we should still have the output to wr->data and the input
 745          * from wr->input.  Length should be wr->length.
 746          * wr->data still points in the wb->buf */
 747
 748         if (mac_size != 0)
 749                 {
 750                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
 751                 wr->length+=mac_size;
 752                 wr->input=p;
 753                 wr->data=p;
 754                 }
 755
 756         /* ssl3_enc can only have an error on read */
 757         s->method->ssl3_enc->enc(s,1);
 758
 759         /* record length after mac and block padding */
 760         s2n(wr->length,plen);
 761
 762         /* we should now have
 763          * wr->data pointing to the encrypted data, which is
 764          * wr->length long */
 765         wr->type=type; /* not needed but helps for debugging */
 766         wr->length+=SSL3_RT_HEADER_LENGTH;
 767
 768         if (create_empty_fragment)
 769                 {
 770                 /* we are in a recursive call;
 771                  * just return the length, don't write out anything here
 772                  */
 773                 return wr->length;
 774                 }
 775
 776         /* now let's set up wb */
 777         wb->left = prefix_len + wr->length;
 778
 779         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 780         s->s3->wpend_tot=len;
 781         s->s3->wpend_buf=buf;
 782         s->s3->wpend_type=type;
 783         s->s3->wpend_ret=len;
 784
 785         /* we now just need to write the buffer */
 786         return ssl3_write_pending(s,type,buf,len);
 787 err:
 788         return -1;
 789         }
 790
 791 /* if s->s3->wbuf.left != 0, we need to call this */
 792 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
 793         unsigned int len)
 794         {
 795         int i;
 796         SSL3_BUFFER *wb=&(s->s3->wbuf);
 797
 798 /* XXXX */
 799         if ((s->s3->wpend_tot > (int)len)
 800                 || ((s->s3->wpend_buf != buf) &&
 801                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
 802                 || (s->s3->wpend_type != type))
 803                 {
 804                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
 805                 return(-1);
 806                 }
 807
 808         for (;;)
 809                 {
 810                 clear_sys_error();
 811                 if (s->wbio != NULL)
 812                         {
 813                         s->rwstate=SSL_WRITING;
 814                         i=BIO_write(s->wbio,
 815                                 (char *)&(wb->buf[wb->offset]),
 816                                 (unsigned int)wb->left);
 817                         }
 818                 else
 819                         {
 820                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
 821                         i= -1;
 822                         }
 823                 if (i == wb->left)
 824                         {
 825                         wb->left=0;
 826                         wb->offset+=i;
 827                         if (s->mode & SSL_MODE_RELEASE_BUFFERS)
 828                                 ssl3_release_write_buffer(s);
 829                         s->rwstate=SSL_NOTHING;
 830                         return(s->s3->wpend_ret);
 831                         }
 832                 else if (i <= 0) {
 833                         if (s->version == DTLS1_VERSION) {
 834                                 /* For DTLS, just drop it. That's kind of the wh
 835 ole
 836                                    point in using a datagram service */
 837                                 wb->left = 0;
 838                         }
 839                         return(i);
 840                 }
 841                 wb->offset+=i;
 842                 wb->left-=i;
 843                 }
 844         }
 845
 846 /* Return up to 'len' payload bytes received in 'type' records.
 847  * 'type' is one of the following:
 848  *
 849  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
 850  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
 851  *   -  0 (during a shutdown, no data has to be returned)
 852  *
 853  * If we don't have stored data to work from, read a SSL/TLS record first
 854  * (possibly multiple records if we still don't have anything to return).
 855  *
 856  * This function must handle any surprises the peer may have for us, such as
 857  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
 858  * a surprise, but handled as if it were), or renegotiation requests.
 859  * Also if record payloads contain fragments too small to process, we store
 860  * them until there is enough for the respective protocol (the record protocol
 861  * may use arbitrary fragmentation and even interleaving):
 862  *     Change cipher spec protocol
 863  *             just 1 byte needed, no need for keeping anything stored
 864  *     Alert protocol
 865  *             2 bytes needed (AlertLevel, AlertDescription)
 866  *     Handshake protocol
 867  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
 868  *             to detect unexpected Client Hello and Hello Request messages
 869  *             here, anything else is handled by higher layers
 870  *     Application data protocol
 871  *             none of our business
 872  */
 873 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
 874         {
 875         int al,i,j,ret;
 876         unsigned int n;
 877         SSL3_RECORD *rr;
 878         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
 879
 880         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
 881                 if (!ssl3_setup_read_buffer(s))
 882                         return(-1);
 883
 884         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
 885             (peek && (type != SSL3_RT_APPLICATION_DATA)))
 886                 {
 887                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
 888                 return -1;
 889                 }
 890
 891         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
 892                 /* (partially) satisfy request from storage */
 893                 {
 894                 unsigned char *src = s->s3->handshake_fragment;
 895                 unsigned char *dst = buf;
 896                 unsigned int k;
 897
 898                 /* peek == 0 */
 899                 n = 0;
 900                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
 901                         {
 902                         *dst++ = *src++;
 903                         len--; s->s3->handshake_fragment_len--;
 904                         n++;
 905                         }
 906                 /* move any remaining fragment bytes: */
 907                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
 908                         s->s3->handshake_fragment[k] = *src++;
 909                 return n;
 910         }
 911
 912         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
 913
 914         if (!s->in_handshake && SSL_in_init(s))
 915                 {
 916                 /* type == SSL3_RT_APPLICATION_DATA */
 917                 i=s->handshake_func(s);
 918                 if (i < 0) return(i);
 919                 if (i == 0)
 920                         {
 921                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 922                         return(-1);
 923                         }
 924                 }
 925 start:
 926         s->rwstate=SSL_NOTHING;
 927
 928         /* s->s3->rrec.type         - is the type of record
 929          * s->s3->rrec.data,    - data
 930          * s->s3->rrec.off,     - offset into 'data' for next read
 931          * s->s3->rrec.length,  - number of bytes. */
 932         rr = &(s->s3->rrec);
 933
 934         /* get new packet if necessary */
 935         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
 936                 {
 937                 ret=ssl3_get_record(s);
 938                 if (ret <= 0) return(ret);
 939                 }
 940
 941         /* we now have a packet which can be read and processed */
 942
 943         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
 944                                        * reset by ssl3_get_finished */
 945                 && (rr->type != SSL3_RT_HANDSHAKE))
 946                 {
 947                 al=SSL_AD_UNEXPECTED_MESSAGE;
 948                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
 949                 goto f_err;
 950                 }
 951
 952         /* If the other end has shut down, throw anything we read away
 953          * (even in 'peek' mode) */
 954         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
 955                 {
 956                 rr->length=0;
 957                 s->rwstate=SSL_NOTHING;
 958                 return(0);
 959                 }
 960
 961
 962         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
 963                 {
 964                 /* make sure that we are not getting application data when we
 965                  * are doing a handshake for the first time */
 966                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
 967                         (s->enc_read_ctx == NULL))
 968                         {
 969                         al=SSL_AD_UNEXPECTED_MESSAGE;
 970                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
 971                         goto f_err;
 972                         }
 973
 974                 if (len <= 0) return(len);
 975
 976                 if ((unsigned int)len > rr->length)
 977                         n = rr->length;
 978                 else
 979                         n = (unsigned int)len;
 980
 981                 memcpy(buf,&(rr->data[rr->off]),n);
 982                 if (!peek)
 983                         {
 984                         rr->length-=n;
 985                         rr->off+=n;
 986                         if (rr->length == 0)
 987                                 {
 988                                 s->rstate=SSL_ST_READ_HEADER;
 989                                 rr->off=0;
 990                                 if (s->mode & SSL_MODE_RELEASE_BUFFERS)
 991                                         ssl3_release_read_buffer(s);
 992                                 }
 993                         }
 994                 return(n);
 995                 }
 996
 997
 998         /* If we get here, then type != rr->type; if we have a handshake
 999          * message, then it was unexpected (Hello Request or Client Hello). */
1000
1001         /* In case of record types for which we have 'fragment' storage,
1002          * fill that so that we can process the data at a fixed place.
1003          */
1004                 {
1005                 unsigned int dest_maxlen = 0;
1006                 unsigned char *dest = NULL;
1007                 unsigned int *dest_len = NULL;
1008
1009                 if (rr->type == SSL3_RT_HANDSHAKE)
1010                         {
1011                         dest_maxlen = sizeof s->s3->handshake_fragment;
1012                         dest = s->s3->handshake_fragment;
1013                         dest_len = &s->s3->handshake_fragment_len;
1014                         }
1015                 else if (rr->type == SSL3_RT_ALERT)
1016                         {
1017                         dest_maxlen = sizeof s->s3->alert_fragment;
1018                         dest = s->s3->alert_fragment;
1019                         dest_len = &s->s3->alert_fragment_len;
1020                         }
1021
1022                 if (dest_maxlen > 0)
1023                         {
1024                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1025                         if (rr->length < n)
1026                                 n = rr->length; /* available bytes */
1027
1028                         /* now move 'n' bytes: */
1029                         while (n-- > 0)
1030                                 {
1031                                 dest[(*dest_len)++] = rr->data[rr->off++];
1032                                 rr->length--;
1033                                 }
1034
1035                         if (*dest_len < dest_maxlen)
1036                                 goto start; /* fragment was too small */
1037                         }
1038                 }
1039
1040         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1041          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1042          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1043
1044         /* If we are a client, check for an incoming 'Hello Request': */
1045         if ((!s->server) &&
1046                 (s->s3->handshake_fragment_len >= 4) &&
1047                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1048                 (s->session != NULL) && (s->session->cipher != NULL))
1049                 {
1050                 s->s3->handshake_fragment_len = 0;
1051
1052                 if ((s->s3->handshake_fragment[1] != 0) ||
1053                         (s->s3->handshake_fragment[2] != 0) ||
1054                         (s->s3->handshake_fragment[3] != 0))
1055                         {
1056                         al=SSL_AD_DECODE_ERROR;
1057                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1058                         goto f_err;
1059                         }
1060
1061                 if (s->msg_callback)
1062                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1063
1064                 if (SSL_is_init_finished(s) &&
1065                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1066                         !s->s3->renegotiate)
1067                         {
1068                         ssl3_renegotiate(s);
1069                         if (ssl3_renegotiate_check(s))
1070                                 {
1071                                 i=s->handshake_func(s);
1072                                 if (i < 0) return(i);
1073                                 if (i == 0)
1074                                         {
1075                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1076                                         return(-1);
1077                                         }
1078
1079                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1080                                         {
1081                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1082                                                 {
1083                                                 BIO *bio;
1084                                                 /* In the case where we try to read application data,
1085                                                  * but we trigger an SSL handshake, we return -1 with
1086                                                  * the retry option set.  Otherwise renegotiation may
1087                                                  * cause nasty problems in the blocking world */
1088                                                 s->rwstate=SSL_READING;
1089                                                 bio=SSL_get_rbio(s);
1090                                                 BIO_clear_retry_flags(bio);
1091                                                 BIO_set_retry_read(bio);
1092                                                 return(-1);
1093                                                 }
1094                                         }
1095                                 }
1096                         }
1097                 /* we either finished a handshake or ignored the request,
1098                  * now try again to obtain the (application) data we were asked for */
1099                 goto start;
1100                 }
1101
1102         if (s->s3->alert_fragment_len >= 2)
1103                 {
1104                 int alert_level = s->s3->alert_fragment[0];
1105                 int alert_descr = s->s3->alert_fragment[1];
1106
1107                 s->s3->alert_fragment_len = 0;
1108
1109                 if (s->msg_callback)
1110                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1111
1112                 if (s->info_callback != NULL)
1113                         cb=s->info_callback;
1114                 else if (s->ctx->info_callback != NULL)
1115                         cb=s->ctx->info_callback;
1116
1117                 if (cb != NULL)
1118                         {
1119                         j = (alert_level << 8) | alert_descr;
1120                         cb(s, SSL_CB_READ_ALERT, j);
1121                         }
1122
1123                 if (alert_level == 1) /* warning */
1124                         {
1125                         s->s3->warn_alert = alert_descr;
1126                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1127                                 {
1128                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1129                                 return(0);
1130                                 }
1131                         }
1132                 else if (alert_level == 2) /* fatal */
1133                         {
1134                         char tmp[16];
1135
1136                         s->rwstate=SSL_NOTHING;
1137                         s->s3->fatal_alert = alert_descr;
1138                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1139                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1140                         ERR_add_error_data(2,"SSL alert number ",tmp);
1141                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1142                         SSL_CTX_remove_session(s->ctx,s->session);
1143                         return(0);
1144                         }
1145                 else
1146                         {
1147                         al=SSL_AD_ILLEGAL_PARAMETER;
1148                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1149                         goto f_err;
1150                         }
1151
1152                 goto start;
1153                 }
1154
1155         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1156                 {
1157                 s->rwstate=SSL_NOTHING;
1158                 rr->length=0;
1159                 return(0);
1160                 }
1161
1162         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1163                 {
1164                 /* 'Change Cipher Spec' is just a single byte, so we know
1165                  * exactly what the record payload has to look like */
1166                 if (    (rr->length != 1) || (rr->off != 0) ||
1167                         (rr->data[0] != SSL3_MT_CCS))
1168                         {
1169                         al=SSL_AD_ILLEGAL_PARAMETER;
1170                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1171                         goto f_err;
1172                         }
1173
1174                 /* Check we have a cipher to change to */
1175                 if (s->s3->tmp.new_cipher == NULL)
1176                         {
1177                         al=SSL_AD_UNEXPECTED_MESSAGE;
1178                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1179                         goto f_err;
1180                         }
1181
1182                 rr->length=0;
1183
1184                 if (s->msg_callback)
1185                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1186
1187                 s->s3->change_cipher_spec=1;
1188                 if (!ssl3_do_change_cipher_spec(s))
1189                         goto err;
1190                 else
1191                         goto start;
1192                 }
1193
1194         /* Unexpected handshake message (Client Hello, or protocol violation) */
1195         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1196                 {
1197                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1198                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1199                         {
1200 #if 0 /* worked only because C operator preferences are not as expected (and
1201        * because this is not really needed for clients except for detecting
1202        * protocol violations): */
1203                         s->state=SSL_ST_BEFORE|(s->server)
1204                                 ?SSL_ST_ACCEPT
1205                                 :SSL_ST_CONNECT;
1206 #else
1207                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1208 #endif
1209                         s->new_session=1;
1210                         }
1211                 i=s->handshake_func(s);
1212                 if (i < 0) return(i);
1213                 if (i == 0)
1214                         {
1215                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1216                         return(-1);
1217                         }
1218
1219                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1220                         {
1221                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1222                                 {
1223                                 BIO *bio;
1224                                 /* In the case where we try to read application data,
1225                                  * but we trigger an SSL handshake, we return -1 with
1226                                  * the retry option set.  Otherwise renegotiation may
1227                                  * cause nasty problems in the blocking world */
1228                                 s->rwstate=SSL_READING;
1229                                 bio=SSL_get_rbio(s);
1230                                 BIO_clear_retry_flags(bio);
1231                                 BIO_set_retry_read(bio);
1232                                 return(-1);
1233                                 }
1234                         }
1235                 goto start;
1236                 }
1237
1238         switch (rr->type)
1239                 {
1240         default:
1241 #ifndef OPENSSL_NO_TLS
1242                 /* TLS just ignores unknown message types */
1243                 if (s->version == TLS1_VERSION)
1244                         {
1245                         rr->length = 0;
1246                         goto start;
1247                         }
1248 #endif
1249                 al=SSL_AD_UNEXPECTED_MESSAGE;
1250                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1251                 goto f_err;
1252         case SSL3_RT_CHANGE_CIPHER_SPEC:
1253         case SSL3_RT_ALERT:
1254         case SSL3_RT_HANDSHAKE:
1255                 /* we already handled all of these, with the possible exception
1256                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1257                  * should not happen when type != rr->type */
1258                 al=SSL_AD_UNEXPECTED_MESSAGE;
1259                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1260                 goto f_err;
1261         case SSL3_RT_APPLICATION_DATA:
1262                 /* At this point, we were expecting handshake data,
1263                  * but have application data.  If the library was
1264                  * running inside ssl3_read() (i.e. in_read_app_data
1265                  * is set) and it makes sense to read application data
1266                  * at this point (session renegotiation not yet started),
1267                  * we will indulge it.
1268                  */
1269                 if (s->s3->in_read_app_data &&
1270                         (s->s3->total_renegotiations != 0) &&
1271                         ((
1272                                 (s->state & SSL_ST_CONNECT) &&
1273                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1274                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1275                                 ) || (
1276                                         (s->state & SSL_ST_ACCEPT) &&
1277                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1278                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1279                                         )
1280                                 ))
1281                         {
1282                         s->s3->in_read_app_data=2;
1283                         return(-1);
1284                         }
1285                 else
1286                         {
1287                         al=SSL_AD_UNEXPECTED_MESSAGE;
1288                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1289                         goto f_err;
1290                         }
1291                 }
1292         /* not reached */
1293
1294 f_err:
1295         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1296 err:
1297         return(-1);
1298         }
1299
1300 int ssl3_do_change_cipher_spec(SSL *s)
1301         {
1302         int i;
1303         const char *sender;
1304         int slen;
1305
1306         if (s->state & SSL_ST_ACCEPT)
1307                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1308         else
1309                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1310
1311         if (s->s3->tmp.key_block == NULL)
1312                 {
1313                 if (s->session == NULL)
1314                         {
1315                         /* might happen if dtls1_read_bytes() calls this */
1316                         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1317                         return (0);
1318                         }
1319
1320                 s->session->cipher=s->s3->tmp.new_cipher;
1321                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1322                 }
1323
1324         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1325                 return(0);
1326
1327         /* we have to record the message digest at
1328          * this point so we can get it before we read
1329          * the finished message */
1330         if (s->state & SSL_ST_CONNECT)
1331                 {
1332                 sender=s->method->ssl3_enc->server_finished_label;
1333                 slen=s->method->ssl3_enc->server_finished_label_len;
1334                 }
1335         else
1336                 {
1337                 sender=s->method->ssl3_enc->client_finished_label;
1338                 slen=s->method->ssl3_enc->client_finished_label_len;
1339                 }
1340
1341         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1342                 sender,slen,s->s3->tmp.peer_finish_md);
1343
1344         return(1);
1345         }
1346
1347 void ssl3_send_alert(SSL *s, int level, int desc)
1348         {
1349         /* Map tls/ssl alert value to correct one */
1350         desc=s->method->ssl3_enc->alert_value(desc);
1351         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1352                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1353         if (desc < 0) return;
1354         /* If a fatal one, remove from cache */
1355         if ((level == 2) && (s->session != NULL))
1356                 SSL_CTX_remove_session(s->ctx,s->session);
1357
1358         s->s3->alert_dispatch=1;
1359         s->s3->send_alert[0]=level;
1360         s->s3->send_alert[1]=desc;
1361         if (s->s3->wbuf.left == 0) /* data still being written out? */
1362                 s->method->ssl_dispatch_alert(s);
1363         /* else data is still being written out, we will get written
1364          * some time in the future */
1365         }
1366
1367 int ssl3_dispatch_alert(SSL *s)
1368         {
1369         int i,j;
1370         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1371
1372         s->s3->alert_dispatch=0;
1373         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1374         if (i <= 0)
1375                 {
1376                 s->s3->alert_dispatch=1;
1377                 }
1378         else
1379                 {
1380                 /* Alert sent to BIO.  If it is important, flush it now.
1381                  * If the message does not get sent due to non-blocking IO,
1382                  * we will not worry too much. */
1383                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1384                         (void)BIO_flush(s->wbio);
1385
1386                 if (s->msg_callback)
1387                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1388
1389                 if (s->info_callback != NULL)
1390                         cb=s->info_callback;
1391                 else if (s->ctx->info_callback != NULL)
1392                         cb=s->ctx->info_callback;
1393
1394                 if (cb != NULL)
1395                         {
1396                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1397                         cb(s,SSL_CB_WRITE_ALERT,j);
1398                         }
1399                 }
1400         return(i);
1401         }