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