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 <limits.h>
 114 #include <errno.h>
 115 #define USE_SOCKETS
 116 #include "ssl_locl.h"
 117 #include <openssl/evp.h>
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120
 121 #ifndef  EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
 122 # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
 123 #endif
 124
 125 #if     defined(OPENSSL_SMALL_FOOTPRINT) || \
 126         !(      defined(AES_ASM) &&     ( \
 127                 defined(__x86_64)       || defined(__x86_64__)  || \
 128                 defined(_M_AMD64)       || defined(_M_X64)      || \
 129                 defined(__INTEL__)      ) \
 130         )
 131 # undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
 132 # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
 133 #endif
 134
 135 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 136                          unsigned int len, int create_empty_fragment);
 137 static int ssl3_get_record(SSL *s);
 138
 139 int ssl3_read_n(SSL *s, int n, int max, int extend)
 140         {
 141         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
 142          * packet by another n bytes.
 143          * The packet will be in the sub-array of s->s3->rbuf.buf specified
 144          * by s->packet and s->packet_length.
 145          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
 146          * [plus s->packet_length bytes if extend == 1].)
 147          */
 148         int i,len,left;
 149         long align=0;
 150         unsigned char *pkt;
 151         SSL3_BUFFER *rb;
 152
 153         if (n <= 0) return n;
 154
 155         rb    = &(s->s3->rbuf);
 156         if (rb->buf == NULL)
 157                 if (!ssl3_setup_read_buffer(s))
 158                         return -1;
 159
 160         left  = rb->left;
 161 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 162         align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
 163         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
 164 #endif
 165
 166         if (!extend)
 167                 {
 168                 /* start with empty packet ... */
 169                 if (left == 0)
 170                         rb->offset = align;
 171                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
 172                         {
 173                         /* check if next packet length is large
 174                          * enough to justify payload alignment... */
 175                         pkt = rb->buf + rb->offset;
 176                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
 177                             && (pkt[3]<<8|pkt[4]) >= 128)
 178                                 {
 179                                 /* Note that even if packet is corrupted
 180                                  * and its length field is insane, we can
 181                                  * only be led to wrong decision about
 182                                  * whether memmove will occur or not.
 183                                  * Header values has no effect on memmove
 184                                  * arguments and therefore no buffer
 185                                  * overrun can be triggered. */
 186                                 memmove (rb->buf+align,pkt,left);
 187                                 rb->offset = align;
 188                                 }
 189                         }
 190                 s->packet = rb->buf + rb->offset;
 191                 s->packet_length = 0;
 192                 /* ... now we can act as if 'extend' was set */
 193                 }
 194
 195         /* For DTLS/UDP reads should not span multiple packets
 196          * because the read operation returns the whole packet
 197          * at once (as long as it fits into the buffer). */
 198         if (SSL_IS_DTLS(s))
 199                 {
 200                 if (left > 0 && n > left)
 201                         n = left;
 202                 }
 203
 204         /* if there is enough in the buffer from a previous read, take some */
 205         if (left >= n)
 206                 {
 207                 s->packet_length+=n;
 208                 rb->left=left-n;
 209                 rb->offset+=n;
 210                 return(n);
 211                 }
 212
 213         /* else we need to read more data */
 214
 215         len = s->packet_length;
 216         pkt = rb->buf+align;
 217         /* Move any available bytes to front of buffer:
 218          * 'len' bytes already pointed to by 'packet',
 219          * 'left' extra ones at the end */
 220         if (s->packet != pkt) /* len > 0 */
 221                 {
 222                 memmove(pkt, s->packet, len+left);
 223                 s->packet = pkt;
 224                 rb->offset = len + align;
 225                 }
 226
 227         if (n > (int)(rb->len - rb->offset)) /* does not happen */
 228                 {
 229                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
 230                 return -1;
 231                 }
 232
 233         if (!s->read_ahead)
 234                 /* ignore max parameter */
 235                 max = n;
 236         else
 237                 {
 238                 if (max < n)
 239                         max = n;
 240                 if (max > (int)(rb->len - rb->offset))
 241                         max = rb->len - rb->offset;
 242                 }
 243
 244         while (left < n)
 245                 {
 246                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
 247                  * and need to read in more until we have len+n (up to
 248                  * len+max if possible) */
 249
 250                 clear_sys_error();
 251                 if (s->rbio != NULL)
 252                         {
 253                         s->rwstate=SSL_READING;
 254                         i=BIO_read(s->rbio,pkt+len+left, max-left);
 255                         }
 256                 else
 257                         {
 258                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
 259                         i = -1;
 260                         }
 261
 262                 if (i <= 0)
 263                         {
 264                         rb->left = left;
 265                         if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
 266                                 !SSL_IS_DTLS(s))
 267                                 if (len+left == 0)
 268                                         ssl3_release_read_buffer(s);
 269                         return(i);
 270                         }
 271                 left+=i;
 272                 /* reads should *never* span multiple packets for DTLS because
 273                  * the underlying transport protocol is message oriented as opposed
 274                  * to byte oriented as in the TLS case. */
 275                 if (SSL_IS_DTLS(s))
 276                         {
 277                         if (n > left)
 278                                 n = left; /* makes the while condition false */
 279                         }
 280                 }
 281
 282         /* done reading, now the book-keeping */
 283         rb->offset += n;
 284         rb->left = left - n;
 285         s->packet_length += n;
 286         s->rwstate=SSL_NOTHING;
 287         return(n);
 288         }
 289
 290 /* MAX_EMPTY_RECORDS defines the number of consecutive, empty records that will
 291  * be processed per call to ssl3_get_record. Without this limit an attacker
 292  * could send empty records at a faster rate than we can process and cause
 293  * ssl3_get_record to loop forever. */
 294 #define MAX_EMPTY_RECORDS 32
 295
 296 /* Call this to get a new input record.
 297  * It will return <= 0 if more data is needed, normally due to an error
 298  * or non-blocking IO.
 299  * When it finishes, one packet has been decoded and can be found in
 300  * ssl->s3->rrec.type    - is the type of record
 301  * ssl->s3->rrec.data,   - data
 302  * ssl->s3->rrec.length, - number of bytes
 303  */
 304 /* used only by ssl3_read_bytes */
 305 static int ssl3_get_record(SSL *s)
 306         {
 307         int ssl_major,ssl_minor,al;
 308         int enc_err,n,i,ret= -1;
 309         SSL3_RECORD *rr;
 310         SSL_SESSION *sess;
 311         unsigned char *p;
 312         unsigned char md[EVP_MAX_MD_SIZE];
 313         short version;
 314         unsigned mac_size;
 315         size_t extra;
 316         unsigned empty_record_count = 0;
 317
 318         rr= &(s->s3->rrec);
 319         sess=s->session;
 320
 321         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
 322                 extra=SSL3_RT_MAX_EXTRA;
 323         else
 324                 extra=0;
 325         if (extra && !s->s3->init_extra)
 326                 {
 327                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
 328                  * set after ssl3_setup_buffers() was done */
 329                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
 330                 return -1;
 331                 }
 332
 333 again:
 334         /* check if we have the header */
 335         if (    (s->rstate != SSL_ST_READ_BODY) ||
 336                 (s->packet_length < SSL3_RT_HEADER_LENGTH))
 337                 {
 338                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
 339                 if (n <= 0) return(n); /* error or non-blocking */
 340                 s->rstate=SSL_ST_READ_BODY;
 341
 342                 p=s->packet;
 343                 if (s->msg_callback)
 344                         s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
 345
 346                 /* Pull apart the header into the SSL3_RECORD */
 347                 rr->type= *(p++);
 348                 ssl_major= *(p++);
 349                 ssl_minor= *(p++);
 350                 version=(ssl_major<<8)|ssl_minor;
 351                 n2s(p,rr->length);
 352 #if 0
 353 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
 354 #endif
 355
 356                 /* Lets check version */
 357                 if (!s->first_packet)
 358                         {
 359                         if (version != s->version)
 360                                 {
 361                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 362                                 if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
 363                                         /* Send back error using their minor version number :-) */
 364                                         s->version = (unsigned short)version;
 365                                 al=SSL_AD_PROTOCOL_VERSION;
 366                                 goto f_err;
 367                                 }
 368                         }
 369
 370                 if ((version>>8) != SSL3_VERSION_MAJOR)
 371                         {
 372                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
 373                         goto err;
 374                         }
 375
 376                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
 377                         {
 378                         al=SSL_AD_RECORD_OVERFLOW;
 379                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
 380                         goto f_err;
 381                         }
 382
 383                 /* now s->rstate == SSL_ST_READ_BODY */
 384                 }
 385
 386         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
 387
 388         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
 389                 {
 390                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
 391                 i=rr->length;
 392                 n=ssl3_read_n(s,i,i,1);
 393                 if (n <= 0) return(n); /* error or non-blocking io */
 394                 /* now n == rr->length,
 395                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
 396                 }
 397
 398         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
 399
 400         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
 401          * and we have that many bytes in s->packet
 402          */
 403         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
 404
 405         /* ok, we can now read from 's->packet' data into 'rr'
 406          * rr->input points at rr->length bytes, which
 407          * need to be copied into rr->data by either
 408          * the decryption or by the decompression
 409          * When the data is 'copied' into the rr->data buffer,
 410          * rr->input will be pointed at the new buffer */
 411
 412         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
 413          * rr->length bytes of encrypted compressed stuff. */
 414
 415         /* check is not needed I believe */
 416         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
 417                 {
 418                 al=SSL_AD_RECORD_OVERFLOW;
 419                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
 420                 goto f_err;
 421                 }
 422
 423         /* decrypt in place in 'rr->input' */
 424         rr->data=rr->input;
 425         rr->orig_len=rr->length;
 426         /* If in encrypt-then-mac mode calculate mac from encrypted record.
 427          * All the details below are public so no timing details can leak.
 428          */
 429         if (SSL_USE_ETM(s) && s->read_hash)
 430                 {
 431                 unsigned char *mac;
 432                 mac_size=EVP_MD_CTX_size(s->read_hash);
 433                 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
 434                 if (rr->length < mac_size)
 435                         {
 436                         al=SSL_AD_DECODE_ERROR;
 437                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 438                         goto f_err;
 439                         }
 440                 rr->length -= mac_size;
 441                 mac = rr->data + rr->length;
 442                 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
 443                 if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
 444                         {
 445                         al=SSL_AD_BAD_RECORD_MAC;
 446                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 447                         goto f_err;
 448                         }
 449                 }
 450
 451         enc_err = s->method->ssl3_enc->enc(s,0);
 452         /* enc_err is:
 453          *    0: (in non-constant time) if the record is publically invalid.
 454          *    1: if the padding is valid
 455          *    -1: if the padding is invalid */
 456         if (enc_err == 0)
 457                 {
 458                 al=SSL_AD_DECRYPTION_FAILED;
 459                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 460                 goto f_err;
 461                 }
 462
 463 #ifdef TLS_DEBUG
 464 printf("dec %d\n",rr->length);
 465 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
 466 printf("\n");
 467 #endif
 468
 469         /* r->length is now the compressed data plus mac */
 470         if ((sess != NULL) &&
 471             (s->enc_read_ctx != NULL) &&
 472             (EVP_MD_CTX_md(s->read_hash) != NULL) && !SSL_USE_ETM(s))
 473                 {
 474                 /* s->read_hash != NULL => mac_size != -1 */
 475                 unsigned char *mac = NULL;
 476                 unsigned char mac_tmp[EVP_MAX_MD_SIZE];
 477                 mac_size=EVP_MD_CTX_size(s->read_hash);
 478                 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
 479
 480                 /* orig_len is the length of the record before any padding was
 481                  * removed. This is public information, as is the MAC in use,
 482                  * therefore we can safely process the record in a different
 483                  * amount of time if it's too short to possibly contain a MAC.
 484                  */
 485                 if (rr->orig_len < mac_size ||
 486                     /* CBC records must have a padding length byte too. */
 487                     (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 488                      rr->orig_len < mac_size+1))
 489                         {
 490                         al=SSL_AD_DECODE_ERROR;
 491                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
 492                         goto f_err;
 493                         }
 494
 495                 if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
 496                         {
 497                         /* We update the length so that the TLS header bytes
 498                          * can be constructed correctly but we need to extract
 499                          * the MAC in constant time from within the record,
 500                          * without leaking the contents of the padding bytes.
 501                          * */
 502                         mac = mac_tmp;
 503                         ssl3_cbc_copy_mac(mac_tmp, rr, mac_size);
 504                         rr->length -= mac_size;
 505                         }
 506                 else
 507                         {
 508                         /* In this case there's no padding, so |rec->orig_len|
 509                          * equals |rec->length| and we checked that there's
 510                          * enough bytes for |mac_size| above. */
 511                         rr->length -= mac_size;
 512                         mac = &rr->data[rr->length];
 513                         }
 514
 515                 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
 516                 if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
 517                         enc_err = -1;
 518                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
 519                         enc_err = -1;
 520                 }
 521
 522         if (enc_err < 0)
 523                 {
 524                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
 525                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
 526                  * failure is directly visible from the ciphertext anyway,
 527                  * we should not reveal which kind of error occurred -- this
 528                  * might become visible to an attacker (e.g. via a logfile) */
 529                 al=SSL_AD_BAD_RECORD_MAC;
 530                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
 531                 goto f_err;
 532                 }
 533
 534         /* r->length is now just compressed */
 535         if (s->expand != NULL)
 536                 {
 537                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
 538                         {
 539                         al=SSL_AD_RECORD_OVERFLOW;
 540                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
 541                         goto f_err;
 542                         }
 543                 if (!ssl3_do_uncompress(s))
 544                         {
 545                         al=SSL_AD_DECOMPRESSION_FAILURE;
 546                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
 547                         goto f_err;
 548                         }
 549                 }
 550
 551         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
 552                 {
 553                 al=SSL_AD_RECORD_OVERFLOW;
 554                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
 555                 goto f_err;
 556                 }
 557
 558         rr->off=0;
 559         /* So at this point the following is true
 560          * ssl->s3->rrec.type   is the type of record
 561          * ssl->s3->rrec.length == number of bytes in record
 562          * ssl->s3->rrec.off    == offset to first valid byte
 563          * ssl->s3->rrec.data   == where to take bytes from, increment
 564          *                         after use :-).
 565          */
 566
 567         /* we have pulled in a full packet so zero things */
 568         s->packet_length=0;
 569
 570         /* just read a 0 length packet */
 571         if (rr->length == 0)
 572                 {
 573                 empty_record_count++;
 574                 if (empty_record_count > MAX_EMPTY_RECORDS)
 575                         {
 576                         al=SSL_AD_UNEXPECTED_MESSAGE;
 577                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_RECORD_TOO_SMALL);
 578                         goto f_err;
 579                         }
 580                 goto again;
 581                 }
 582
 583 #if 0
 584 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
 585 #endif
 586
 587         return(1);
 588
 589 f_err:
 590         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 591 err:
 592         return(ret);
 593         }
 594
 595 int ssl3_do_uncompress(SSL *ssl)
 596         {
 597 #ifndef OPENSSL_NO_COMP
 598         int i;
 599         SSL3_RECORD *rr;
 600
 601         rr= &(ssl->s3->rrec);
 602         i=COMP_expand_block(ssl->expand,rr->comp,
 603                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
 604         if (i < 0)
 605                 return(0);
 606         else
 607                 rr->length=i;
 608         rr->data=rr->comp;
 609 #endif
 610         return(1);
 611         }
 612
 613 int ssl3_do_compress(SSL *ssl)
 614         {
 615 #ifndef OPENSSL_NO_COMP
 616         int i;
 617         SSL3_RECORD *wr;
 618
 619         wr= &(ssl->s3->wrec);
 620         i=COMP_compress_block(ssl->compress,wr->data,
 621                 SSL3_RT_MAX_COMPRESSED_LENGTH,
 622                 wr->input,(int)wr->length);
 623         if (i < 0)
 624                 return(0);
 625         else
 626                 wr->length=i;
 627
 628         wr->input=wr->data;
 629 #endif
 630         return(1);
 631         }
 632
 633 /* Call this to write data in records of type 'type'
 634  * It will return <= 0 if not all data has been sent or non-blocking IO.
 635  */
 636 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 637         {
 638         const unsigned char *buf=buf_;
 639         int tot;
 640         unsigned int n,nw;
 641 #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
 642         unsigned int max_send_fragment;
 643 #endif
 644         SSL3_BUFFER *wb=&(s->s3->wbuf);
 645         int i;
 646         unsigned int u_len = (unsigned int)len;
 647
 648         if (len < 0)
 649                 {
 650                 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_NEGATIVE_LENGTH);
 651                 return -1;
 652                 }
 653
 654         s->rwstate=SSL_NOTHING;
 655         OPENSSL_assert(s->s3->wnum <= INT_MAX);
 656         tot=s->s3->wnum;
 657         s->s3->wnum=0;
 658
 659         if (SSL_in_init(s) && !s->in_handshake)
 660                 {
 661                 i=s->handshake_func(s);
 662                 if (i < 0) return(i);
 663                 if (i == 0)
 664                         {
 665                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
 666                         return -1;
 667                         }
 668                 }
 669
 670         /* ensure that if we end up with a smaller value of data to write
 671          * out than the the original len from a write which didn't complete
 672          * for non-blocking I/O and also somehow ended up avoiding
 673          * the check for this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as
 674          * it must never be possible to end up with (len-tot) as a large
 675          * number that will then promptly send beyond the end of the users
 676          * buffer ... so we trap and report the error in a way the user
 677          * will notice
 678          */
 679         if (len < tot)
 680                 {
 681                 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_BAD_LENGTH);
 682                 return(-1);
 683                 }
 684
 685         /* first check if there is a SSL3_BUFFER still being written
 686          * out.  This will happen with non blocking IO */
 687         if (wb->left != 0)
 688                 {
 689                 i = ssl3_write_pending(s,type,&buf[tot],s->s3->wpend_tot);
 690                 if (i<=0)
 691                         {
 692                         /* XXX should we ssl3_release_write_buffer if i<0? */
 693                         s->s3->wnum=tot;
 694                         return i;
 695                         }
 696                 tot += i;       /* this might be last fragment */
 697                 }
 698
 699 #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
 700         /*
 701          * Depending on platform multi-block can deliver several *times*
 702          * better performance. Downside is that it has to allocate
 703          * jumbo buffer to accomodate up to 8 records, but the
 704          * compromise is considered worthy.
 705          */
 706         if (type==SSL3_RT_APPLICATION_DATA &&
 707             u_len >= 4*(max_send_fragment=s->max_send_fragment) &&
 708             s->compress==NULL && s->msg_callback==NULL &&
 709             !SSL_USE_ETM(s) && SSL_USE_EXPLICIT_IV(s) &&
 710             EVP_CIPHER_flags(s->enc_write_ctx->cipher)&EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
 711                 {
 712                 unsigned char aad[13];
 713                 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
 714                 int packlen;
 715
 716                 /* minimize address aliasing conflicts */
 717                 if ((max_send_fragment&0xfff) == 0)
 718                         max_send_fragment -= 512;
 719
 720                 if (tot==0 || wb->buf==NULL)    /* allocate jumbo buffer */
 721                         {
 722                         ssl3_release_write_buffer(s);
 723
 724                         packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
 725                                         EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
 726                                         max_send_fragment,NULL);
 727
 728                         if (u_len >= 8*max_send_fragment)       packlen *= 8;
 729                         else                            packlen *= 4;
 730
 731                         wb->buf=OPENSSL_malloc(packlen);
 732                         wb->len=packlen;
 733                         }
 734                 else if (tot==len)              /* done? */
 735                         {
 736                         OPENSSL_free(wb->buf);  /* free jumbo buffer */
 737                         wb->buf = NULL;
 738                         return tot;
 739                         }
 740
 741                 n=(len-tot);
 742                 for (;;)
 743                         {
 744                         if (n < 4*max_send_fragment)
 745                                 {
 746                                 OPENSSL_free(wb->buf);  /* free jumbo buffer */
 747                                 wb->buf = NULL;
 748                                 break;
 749                                 }
 750
 751                         if (s->s3->alert_dispatch)
 752                                 {
 753                                 i=s->method->ssl_dispatch_alert(s);
 754                                 if (i <= 0)
 755                                         {
 756                                         s->s3->wnum=tot;
 757                                         return i;
 758                                         }
 759                                 }
 760
 761                         if (n >= 8*max_send_fragment)
 762                                 nw = max_send_fragment*(mb_param.interleave=8);
 763                         else
 764                                 nw = max_send_fragment*(mb_param.interleave=4);
 765
 766                         memcpy(aad,s->s3->write_sequence,8);
 767                         aad[8]=type;
 768                         aad[9]=(unsigned char)(s->version>>8);
 769                         aad[10]=(unsigned char)(s->version);
 770                         aad[11]=0;
 771                         aad[12]=0;
 772                         mb_param.out = NULL;
 773                         mb_param.inp = aad;
 774                         mb_param.len = nw;
 775
 776                         packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
 777                                         EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
 778                                         sizeof(mb_param),&mb_param);
 779
 780                         if (packlen<=0 || packlen>(int)wb->len) /* never happens */
 781                                 {
 782                                 OPENSSL_free(wb->buf);  /* free jumbo buffer */
 783                                 wb->buf = NULL;
 784                                 break;
 785                                 }
 786
 787                         mb_param.out = wb->buf;
 788                         mb_param.inp = &buf[tot];
 789                         mb_param.len = nw;
 790
 791                         if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
 792                                         EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
 793                                         sizeof(mb_param),&mb_param)<=0)
 794                                 return -1;
 795
 796                         s->s3->write_sequence[7] += mb_param.interleave;
 797                         if (s->s3->write_sequence[7] < mb_param.interleave)
 798                                 {
 799                                 int j=6;
 800                                 while (j>=0 && (++s->s3->write_sequence[j--])==0) ;
 801                                 }
 802
 803                         wb->offset = 0;
 804                         wb->left = packlen;
 805
 806                         s->s3->wpend_tot = nw;
 807                         s->s3->wpend_buf = &buf[tot];
 808                         s->s3->wpend_type= type;
 809                         s->s3->wpend_ret = nw;
 810
 811                         i = ssl3_write_pending(s,type,&buf[tot],nw);
 812                         if (i<=0)
 813                                 {
 814                                 if (i<0)
 815                                         {
 816                                         OPENSSL_free(wb->buf);
 817                                         wb->buf = NULL;
 818                                         }
 819                                 s->s3->wnum=tot;
 820                                 return i;
 821                                 }
 822                         if (i==(int)n)
 823                                 {
 824                                 OPENSSL_free(wb->buf);  /* free jumbo buffer */
 825                                 wb->buf = NULL;
 826                                 return tot+i;
 827                                 }
 828                         n-=i;
 829                         tot+=i;
 830                         }
 831                 }
 832         else
 833 #endif
 834         if (tot==len)           /* done? */
 835                 {
 836                 if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
 837                         !SSL_IS_DTLS(s))
 838                         ssl3_release_write_buffer(s);
 839
 840                 return tot;
 841                 }
 842
 843
 844         n=(len-tot);
 845         for (;;)
 846                 {
 847                 if (n > s->max_send_fragment)
 848                         nw=s->max_send_fragment;
 849                 else
 850                         nw=n;
 851
 852                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
 853                 if (i <= 0)
 854                         {
 855                         /* XXX should we ssl3_release_write_buffer if i<0? */
 856                         s->s3->wnum=tot;
 857                         return i;
 858                         }
 859
 860                 if ((i == (int)n) ||
 861                         (type == SSL3_RT_APPLICATION_DATA &&
 862                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
 863                         {
 864                         /* next chunk of data should get another prepended empty fragment
 865                          * in ciphersuites with known-IV weakness: */
 866                         s->s3->empty_fragment_done = 0;
 867
 868                         if ((i==(int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS &&
 869                                 !SSL_IS_DTLS(s))
 870                                 ssl3_release_write_buffer(s);
 871
 872                         return tot+i;
 873                         }
 874
 875                 n-=i;
 876                 tot+=i;
 877                 }
 878         }
 879
 880 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
 881                          unsigned int len, int create_empty_fragment)
 882         {
 883         unsigned char *p,*plen;
 884         int i,mac_size,clear=0;
 885         int prefix_len=0;
 886         int eivlen;
 887         long align=0;
 888         SSL3_RECORD *wr;
 889         SSL3_BUFFER *wb=&(s->s3->wbuf);
 890         SSL_SESSION *sess;
 891
 892
 893         /* first check if there is a SSL3_BUFFER still being written
 894          * out.  This will happen with non blocking IO */
 895         if (wb->left != 0)
 896                 return(ssl3_write_pending(s,type,buf,len));
 897
 898         /* If we have an alert to send, lets send it */
 899         if (s->s3->alert_dispatch)
 900                 {
 901                 i=s->method->ssl_dispatch_alert(s);
 902                 if (i <= 0)
 903                         return(i);
 904                 /* if it went, fall through and send more stuff */
 905                 }
 906
 907         if (wb->buf == NULL)
 908                 if (!ssl3_setup_write_buffer(s))
 909                         return -1;
 910
 911         if (len == 0 && !create_empty_fragment)
 912                 return 0;
 913
 914         wr= &(s->s3->wrec);
 915         sess=s->session;
 916
 917         if (    (sess == NULL) ||
 918                 (s->enc_write_ctx == NULL) ||
 919                 (EVP_MD_CTX_md(s->write_hash) == NULL))
 920                 {
 921 #if 1
 922                 clear=s->enc_write_ctx?0:1;     /* must be AEAD cipher */
 923 #else
 924                 clear=1;
 925 #endif
 926                 mac_size=0;
 927                 }
 928         else
 929                 {
 930                 mac_size=EVP_MD_CTX_size(s->write_hash);
 931                 if (mac_size < 0)
 932                         goto err;
 933                 }
 934
 935 #if 0 && !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
 936         if (type==SSL3_RT_APPLICATION_DATA && s->compress==NULL &&
 937             !SSL_USE_ETM(s) && SSL_USE_EXPLICIT_IV(s) && /*!SSL_IS_DTLS(s) &&*/
 938             EVP_CIPHER_flags(s->enc_write_ctx->cipher)&EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
 939                 do {
 940                 unsigned char aad[13];
 941                 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param = {NULL,aad,sizeof(aad),0};
 942                 int packlen;
 943
 944                 memcpy(aad,s->s3->write_sequence,8);
 945                 aad[8]=type;
 946                 aad[9]=(unsigned char)(s->version>>8);
 947                 aad[10]=(unsigned char)(s->version);
 948                 aad[11]=(unsigned char)(len>>8);
 949                 aad[12]=(unsigned char)len;
 950                 packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
 951                                 EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
 952                                 sizeof(mb_param),&mb_param);
 953
 954                 if (packlen==0 || packlen > wb->len) break;
 955
 956                 mb_param.out = wb->buf;
 957                 mb_param.inp = buf;
 958                 mb_param.len = len;
 959                 EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
 960                                 EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
 961                                 sizeof(mb_param),&mb_param);
 962
 963                 s->s3->write_sequence[7] += mb_param.interleave;
 964                 if (s->s3->write_sequence[7] < mb_param.interleave)
 965                         {
 966                         int j=6;
 967                         while (j>=0 && (++s->s3->write_sequence[j--])==0) ;
 968                         }
 969
 970                 wb->offset=0;
 971                 wb->left = packlen;
 972
 973                 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
 974                 s->s3->wpend_tot=len;
 975                 s->s3->wpend_buf=buf;
 976                 s->s3->wpend_type=type;
 977                 s->s3->wpend_ret=len;
 978
 979                 /* we now just need to write the buffer */
 980                 return ssl3_write_pending(s,type,buf,len);
 981                 } while (0);
 982 #endif
 983
 984         /* 'create_empty_fragment' is true only when this function calls itself */
 985         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
 986                 {
 987                 /* countermeasure against known-IV weakness in CBC ciphersuites
 988                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 989
 990                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
 991                         {
 992                         /* recursive function call with 'create_empty_fragment' set;
 993                          * this prepares and buffers the data for an empty fragment
 994                          * (these 'prefix_len' bytes are sent out later
 995                          * together with the actual payload) */
 996                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
 997                         if (prefix_len <= 0)
 998                                 goto err;
 999
1000                         if (prefix_len >
1001                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
1002                                 {
1003                                 /* insufficient space */
1004                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
1005                                 goto err;
1006                                 }
1007                         }
1008
1009                 s->s3->empty_fragment_done = 1;
1010                 }
1011
1012         if (create_empty_fragment)
1013                 {
1014 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
1015                 /* extra fragment would be couple of cipher blocks,
1016                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
1017                  * if we want to align the real payload, then we can
1018                  * just pretent we simply have two headers. */
1019                 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
1020                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
1021 #endif
1022                 p = wb->buf + align;
1023                 wb->offset  = align;
1024                 }
1025         else if (prefix_len)
1026                 {
1027                 p = wb->buf + wb->offset + prefix_len;
1028                 }
1029         else
1030                 {
1031 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
1032                 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
1033                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
1034 #endif
1035                 p = wb->buf + align;
1036                 wb->offset  = align;
1037                 }
1038
1039         /* write the header */
1040
1041         *(p++)=type&0xff;
1042         wr->type=type;
1043
1044         *(p++)=(s->version>>8);
1045         /* Some servers hang if iniatial client hello is larger than 256
1046          * bytes and record version number > TLS 1.0
1047          */
1048         if (s->state == SSL3_ST_CW_CLNT_HELLO_B
1049                                 && !s->renegotiate
1050                                 && TLS1_get_version(s) > TLS1_VERSION)
1051                 *(p++) = 0x1;
1052         else
1053                 *(p++)=s->version&0xff;
1054
1055         /* field where we are to write out packet length */
1056         plen=p;
1057         p+=2;
1058         /* Explicit IV length, block ciphers appropriate version flag */
1059         if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s))
1060                 {
1061                 int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
1062                 if (mode == EVP_CIPH_CBC_MODE)
1063                         {
1064                         eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
1065                         if (eivlen <= 1)
1066                                 eivlen = 0;
1067                         }
1068                 /* Need explicit part of IV for GCM mode */
1069                 else if (mode == EVP_CIPH_GCM_MODE)
1070                         eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
1071                 else
1072                         eivlen = 0;
1073                 }
1074         else
1075                 eivlen = 0;
1076
1077         /* lets setup the record stuff. */
1078         wr->data=p + eivlen;
1079         wr->length=(int)len;
1080         wr->input=(unsigned char *)buf;
1081
1082         /* we now 'read' from wr->input, wr->length bytes into
1083          * wr->data */
1084
1085         /* first we compress */
1086         if (s->compress != NULL)
1087                 {
1088                 if (!ssl3_do_compress(s))
1089                         {
1090                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
1091                         goto err;
1092                         }
1093                 }
1094         else
1095                 {
1096                 memcpy(wr->data,wr->input,wr->length);
1097                 wr->input=wr->data;
1098                 }
1099
1100         /* we should still have the output to wr->data and the input
1101          * from wr->input.  Length should be wr->length.
1102          * wr->data still points in the wb->buf */
1103
1104         if (!SSL_USE_ETM(s) && mac_size != 0)
1105                 {
1106                 if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0)
1107                         goto err;
1108                 wr->length+=mac_size;
1109                 }
1110
1111         wr->input=p;
1112         wr->data=p;
1113
1114         if (eivlen)
1115                 {
1116         /*      if (RAND_pseudo_bytes(p, eivlen) <= 0)
1117                         goto err; */
1118                 wr->length += eivlen;
1119                 }
1120
1121         if(s->method->ssl3_enc->enc(s,1)<1) goto err;
1122
1123         if (SSL_USE_ETM(s) && mac_size != 0)
1124                 {
1125                 if (s->method->ssl3_enc->mac(s,p + wr->length,1) < 0)
1126                         goto err;
1127                 wr->length+=mac_size;
1128                 }
1129
1130         /* record length after mac and block padding */
1131         s2n(wr->length,plen);
1132
1133         if (s->msg_callback)
1134                 s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, s->msg_callback_arg);
1135
1136         /* we should now have
1137          * wr->data pointing to the encrypted data, which is
1138          * wr->length long */
1139         wr->type=type; /* not needed but helps for debugging */
1140         wr->length+=SSL3_RT_HEADER_LENGTH;
1141
1142         if (create_empty_fragment)
1143                 {
1144                 /* we are in a recursive call;
1145                  * just return the length, don't write out anything here
1146                  */
1147                 return wr->length;
1148                 }
1149
1150         /* now let's set up wb */
1151         wb->left = prefix_len + wr->length;
1152
1153         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1154         s->s3->wpend_tot=len;
1155         s->s3->wpend_buf=buf;
1156         s->s3->wpend_type=type;
1157         s->s3->wpend_ret=len;
1158
1159         /* we now just need to write the buffer */
1160         return ssl3_write_pending(s,type,buf,len);
1161 err:
1162         return -1;
1163         }
1164
1165 /* if s->s3->wbuf.left != 0, we need to call this */
1166 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
1167         unsigned int len)
1168         {
1169         int i;
1170         SSL3_BUFFER *wb=&(s->s3->wbuf);
1171
1172 /* XXXX */
1173         if ((s->s3->wpend_tot > (int)len)
1174                 || ((s->s3->wpend_buf != buf) &&
1175                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
1176                 || (s->s3->wpend_type != type))
1177                 {
1178                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
1179                 return(-1);
1180                 }
1181
1182         for (;;)
1183                 {
1184                 clear_sys_error();
1185                 if (s->wbio != NULL)
1186                         {
1187                         s->rwstate=SSL_WRITING;
1188                         i=BIO_write(s->wbio,
1189                                 (char *)&(wb->buf[wb->offset]),
1190                                 (unsigned int)wb->left);
1191                         }
1192                 else
1193                         {
1194                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
1195                         i= -1;
1196                         }
1197                 if (i == wb->left)
1198                         {
1199                         wb->left=0;
1200                         wb->offset+=i;
1201                         s->rwstate=SSL_NOTHING;
1202                         return(s->s3->wpend_ret);
1203                         }
1204                 else if (i <= 0) {
1205                         if (s->version == DTLS1_VERSION ||
1206                             s->version == DTLS1_BAD_VER) {
1207                                 /* For DTLS, just drop it. That's kind of the whole
1208                                    point in using a datagram service */
1209                                 wb->left = 0;
1210                         }
1211                         return(i);
1212                 }
1213                 wb->offset+=i;
1214                 wb->left-=i;
1215                 }
1216         }
1217
1218 /* Return up to 'len' payload bytes received in 'type' records.
1219  * 'type' is one of the following:
1220  *
1221  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
1222  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
1223  *   -  0 (during a shutdown, no data has to be returned)
1224  *
1225  * If we don't have stored data to work from, read a SSL/TLS record first
1226  * (possibly multiple records if we still don't have anything to return).
1227  *
1228  * This function must handle any surprises the peer may have for us, such as
1229  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
1230  * a surprise, but handled as if it were), or renegotiation requests.
1231  * Also if record payloads contain fragments too small to process, we store
1232  * them until there is enough for the respective protocol (the record protocol
1233  * may use arbitrary fragmentation and even interleaving):
1234  *     Change cipher spec protocol
1235  *             just 1 byte needed, no need for keeping anything stored
1236  *     Alert protocol
1237  *             2 bytes needed (AlertLevel, AlertDescription)
1238  *     Handshake protocol
1239  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
1240  *             to detect unexpected Client Hello and Hello Request messages
1241  *             here, anything else is handled by higher layers
1242  *     Application data protocol
1243  *             none of our business
1244  */
1245 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
1246         {
1247         int al,i,j,ret;
1248         unsigned int n;
1249         SSL3_RECORD *rr;
1250         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
1251
1252         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
1253                 if (!ssl3_setup_read_buffer(s))
1254                         return(-1);
1255
1256         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE)) ||
1257             (peek && (type != SSL3_RT_APPLICATION_DATA)))
1258                 {
1259                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
1260                 return -1;
1261                 }
1262
1263         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
1264                 /* (partially) satisfy request from storage */
1265                 {
1266                 unsigned char *src = s->s3->handshake_fragment;
1267                 unsigned char *dst = buf;
1268                 unsigned int k;
1269
1270                 /* peek == 0 */
1271                 n = 0;
1272                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
1273                         {
1274                         *dst++ = *src++;
1275                         len--; s->s3->handshake_fragment_len--;
1276                         n++;
1277                         }
1278                 /* move any remaining fragment bytes: */
1279                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
1280                         s->s3->handshake_fragment[k] = *src++;
1281                 return n;
1282         }
1283
1284         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
1285
1286         if (!s->in_handshake && SSL_in_init(s))
1287                 {
1288                 /* type == SSL3_RT_APPLICATION_DATA */
1289                 i=s->handshake_func(s);
1290                 if (i < 0) return(i);
1291                 if (i == 0)
1292                         {
1293                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1294                         return(-1);
1295                         }
1296                 }
1297 start:
1298         s->rwstate=SSL_NOTHING;
1299
1300         /* s->s3->rrec.type         - is the type of record
1301          * s->s3->rrec.data,    - data
1302          * s->s3->rrec.off,     - offset into 'data' for next read
1303          * s->s3->rrec.length,  - number of bytes. */
1304         rr = &(s->s3->rrec);
1305
1306         /* get new packet if necessary */
1307         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
1308                 {
1309                 ret=ssl3_get_record(s);
1310                 if (ret <= 0) return(ret);
1311                 }
1312
1313         /* we now have a packet which can be read and processed */
1314
1315         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
1316                                        * reset by ssl3_get_finished */
1317                 && (rr->type != SSL3_RT_HANDSHAKE))
1318                 {
1319                 al=SSL_AD_UNEXPECTED_MESSAGE;
1320                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
1321                 goto f_err;
1322                 }
1323
1324         /* If the other end has shut down, throw anything we read away
1325          * (even in 'peek' mode) */
1326         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
1327                 {
1328                 rr->length=0;
1329                 s->rwstate=SSL_NOTHING;
1330                 return(0);
1331                 }
1332
1333
1334         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
1335                 {
1336                 /* make sure that we are not getting application data when we
1337                  * are doing a handshake for the first time */
1338                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
1339                         (s->enc_read_ctx == NULL))
1340                         {
1341                         al=SSL_AD_UNEXPECTED_MESSAGE;
1342                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
1343                         goto f_err;
1344                         }
1345
1346                 if (len <= 0) return(len);
1347
1348                 if ((unsigned int)len > rr->length)
1349                         n = rr->length;
1350                 else
1351                         n = (unsigned int)len;
1352
1353                 memcpy(buf,&(rr->data[rr->off]),n);
1354                 if (!peek)
1355                         {
1356                         rr->length-=n;
1357                         rr->off+=n;
1358                         if (rr->length == 0)
1359                                 {
1360                                 s->rstate=SSL_ST_READ_HEADER;
1361                                 rr->off=0;
1362                                 if (s->mode & SSL_MODE_RELEASE_BUFFERS && s->s3->rbuf.left == 0)
1363                                         ssl3_release_read_buffer(s);
1364                                 }
1365                         }
1366                 return(n);
1367                 }
1368
1369
1370         /* If we get here, then type != rr->type; if we have a handshake
1371          * message, then it was unexpected (Hello Request or Client Hello). */
1372
1373         /* In case of record types for which we have 'fragment' storage,
1374          * fill that so that we can process the data at a fixed place.
1375          */
1376                 {
1377                 unsigned int dest_maxlen = 0;
1378                 unsigned char *dest = NULL;
1379                 unsigned int *dest_len = NULL;
1380
1381                 if (rr->type == SSL3_RT_HANDSHAKE)
1382                         {
1383                         dest_maxlen = sizeof s->s3->handshake_fragment;
1384                         dest = s->s3->handshake_fragment;
1385                         dest_len = &s->s3->handshake_fragment_len;
1386                         }
1387                 else if (rr->type == SSL3_RT_ALERT)
1388                         {
1389                         dest_maxlen = sizeof s->s3->alert_fragment;
1390                         dest = s->s3->alert_fragment;
1391                         dest_len = &s->s3->alert_fragment_len;
1392                         }
1393 #ifndef OPENSSL_NO_HEARTBEATS
1394                 else if (rr->type == TLS1_RT_HEARTBEAT)
1395                         {
1396                         tls1_process_heartbeat(s);
1397
1398                         /* Exit and notify application to read again */
1399                         rr->length = 0;
1400                         s->rwstate=SSL_READING;
1401                         BIO_clear_retry_flags(SSL_get_rbio(s));
1402                         BIO_set_retry_read(SSL_get_rbio(s));
1403                         return(-1);
1404                         }
1405 #endif
1406
1407                 if (dest_maxlen > 0)
1408                         {
1409                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1410                         if (rr->length < n)
1411                                 n = rr->length; /* available bytes */
1412
1413                         /* now move 'n' bytes: */
1414                         while (n-- > 0)
1415                                 {
1416                                 dest[(*dest_len)++] = rr->data[rr->off++];
1417                                 rr->length--;
1418                                 }
1419
1420                         if (*dest_len < dest_maxlen)
1421                                 goto start; /* fragment was too small */
1422                         }
1423                 }
1424
1425         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1426          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1427          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1428
1429         /* If we are a client, check for an incoming 'Hello Request': */
1430         if ((!s->server) &&
1431                 (s->s3->handshake_fragment_len >= 4) &&
1432                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1433                 (s->session != NULL) && (s->session->cipher != NULL))
1434                 {
1435                 s->s3->handshake_fragment_len = 0;
1436
1437                 if ((s->s3->handshake_fragment[1] != 0) ||
1438                         (s->s3->handshake_fragment[2] != 0) ||
1439                         (s->s3->handshake_fragment[3] != 0))
1440                         {
1441                         al=SSL_AD_DECODE_ERROR;
1442                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1443                         goto f_err;
1444                         }
1445
1446                 if (s->msg_callback)
1447                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1448
1449                 if (SSL_is_init_finished(s) &&
1450                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1451                         !s->s3->renegotiate)
1452                         {
1453                         ssl3_renegotiate(s);
1454                         if (ssl3_renegotiate_check(s))
1455                                 {
1456                                 i=s->handshake_func(s);
1457                                 if (i < 0) return(i);
1458                                 if (i == 0)
1459                                         {
1460                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1461                                         return(-1);
1462                                         }
1463
1464                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1465                                         {
1466                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1467                                                 {
1468                                                 BIO *bio;
1469                                                 /* In the case where we try to read application data,
1470                                                  * but we trigger an SSL handshake, we return -1 with
1471                                                  * the retry option set.  Otherwise renegotiation may
1472                                                  * cause nasty problems in the blocking world */
1473                                                 s->rwstate=SSL_READING;
1474                                                 bio=SSL_get_rbio(s);
1475                                                 BIO_clear_retry_flags(bio);
1476                                                 BIO_set_retry_read(bio);
1477                                                 return(-1);
1478                                                 }
1479                                         }
1480                                 }
1481                         }
1482                 /* we either finished a handshake or ignored the request,
1483                  * now try again to obtain the (application) data we were asked for */
1484                 goto start;
1485                 }
1486         /* If we are a server and get a client hello when renegotiation isn't
1487          * allowed send back a no renegotiation alert and carry on.
1488          * WARNING: experimental code, needs reviewing (steve)
1489          */
1490         if (s->server &&
1491                 SSL_is_init_finished(s) &&
1492                 !s->s3->send_connection_binding &&
1493                 (s->version > SSL3_VERSION) &&
1494                 (s->s3->handshake_fragment_len >= 4) &&
1495                 (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
1496                 (s->session != NULL) && (s->session->cipher != NULL) &&
1497                 !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1498
1499                 {
1500                 /*s->s3->handshake_fragment_len = 0;*/
1501                 rr->length = 0;
1502                 ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
1503                 goto start;
1504                 }
1505         if (s->s3->alert_fragment_len >= 2)
1506                 {
1507                 int alert_level = s->s3->alert_fragment[0];
1508                 int alert_descr = s->s3->alert_fragment[1];
1509
1510                 s->s3->alert_fragment_len = 0;
1511
1512                 if (s->msg_callback)
1513                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1514
1515                 if (s->info_callback != NULL)
1516                         cb=s->info_callback;
1517                 else if (s->ctx->info_callback != NULL)
1518                         cb=s->ctx->info_callback;
1519
1520                 if (cb != NULL)
1521                         {
1522                         j = (alert_level << 8) | alert_descr;
1523                         cb(s, SSL_CB_READ_ALERT, j);
1524                         }
1525
1526                 if (alert_level == 1) /* warning */
1527                         {
1528                         s->s3->warn_alert = alert_descr;
1529                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1530                                 {
1531                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1532                                 return(0);
1533                                 }
1534                         /* This is a warning but we receive it if we requested
1535                          * renegotiation and the peer denied it. Terminate with
1536                          * a fatal alert because if application tried to
1537                          * renegotiatie it presumably had a good reason and
1538                          * expects it to succeed.
1539                          *
1540                          * In future we might have a renegotiation where we
1541                          * don't care if the peer refused it where we carry on.
1542                          */
1543                         else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
1544                                 {
1545                                 al = SSL_AD_HANDSHAKE_FAILURE;
1546                                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION);
1547                                 goto f_err;
1548                                 }
1549 #ifdef SSL_AD_MISSING_SRP_USERNAME
1550                         else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
1551                                 return(0);
1552 #endif
1553                         }
1554                 else if (alert_level == 2) /* fatal */
1555                         {
1556                         char tmp[16];
1557
1558                         s->rwstate=SSL_NOTHING;
1559                         s->s3->fatal_alert = alert_descr;
1560                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1561                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1562                         ERR_add_error_data(2,"SSL alert number ",tmp);
1563                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1564                         SSL_CTX_remove_session(s->ctx,s->session);
1565                         return(0);
1566                         }
1567                 else
1568                         {
1569                         al=SSL_AD_ILLEGAL_PARAMETER;
1570                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1571                         goto f_err;
1572                         }
1573
1574                 goto start;
1575                 }
1576
1577         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1578                 {
1579                 s->rwstate=SSL_NOTHING;
1580                 rr->length=0;
1581                 return(0);
1582                 }
1583
1584         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1585                 {
1586                 /* 'Change Cipher Spec' is just a single byte, so we know
1587                  * exactly what the record payload has to look like */
1588                 if (    (rr->length != 1) || (rr->off != 0) ||
1589                         (rr->data[0] != SSL3_MT_CCS))
1590                         {
1591                         al=SSL_AD_ILLEGAL_PARAMETER;
1592                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1593                         goto f_err;
1594                         }
1595
1596                 /* Check we have a cipher to change to */
1597                 if (s->s3->tmp.new_cipher == NULL)
1598                         {
1599                         al=SSL_AD_UNEXPECTED_MESSAGE;
1600                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1601                         goto f_err;
1602                         }
1603
1604                 if (!(s->s3->flags & SSL3_FLAGS_CCS_OK))
1605                         {
1606                         al=SSL_AD_UNEXPECTED_MESSAGE;
1607                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1608                         goto f_err;
1609                         }
1610
1611                 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
1612
1613                 rr->length=0;
1614
1615                 if (s->msg_callback)
1616                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1617
1618                 s->s3->change_cipher_spec=1;
1619                 if (!ssl3_do_change_cipher_spec(s))
1620                         goto err;
1621                 else
1622                         goto start;
1623                 }
1624
1625         /* Unexpected handshake message (Client Hello, or protocol violation) */
1626         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1627                 {
1628                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1629                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1630                         {
1631 #if 0 /* worked only because C operator preferences are not as expected (and
1632        * because this is not really needed for clients except for detecting
1633        * protocol violations): */
1634                         s->state=SSL_ST_BEFORE|(s->server)
1635                                 ?SSL_ST_ACCEPT
1636                                 :SSL_ST_CONNECT;
1637 #else
1638                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1639 #endif
1640                         s->renegotiate=1;
1641                         s->new_session=1;
1642                         }
1643                 i=s->handshake_func(s);
1644                 if (i < 0) return(i);
1645                 if (i == 0)
1646                         {
1647                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1648                         return(-1);
1649                         }
1650
1651                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1652                         {
1653                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1654                                 {
1655                                 BIO *bio;
1656                                 /* In the case where we try to read application data,
1657                                  * but we trigger an SSL handshake, we return -1 with
1658                                  * the retry option set.  Otherwise renegotiation may
1659                                  * cause nasty problems in the blocking world */
1660                                 s->rwstate=SSL_READING;
1661                                 bio=SSL_get_rbio(s);
1662                                 BIO_clear_retry_flags(bio);
1663                                 BIO_set_retry_read(bio);
1664                                 return(-1);
1665                                 }
1666                         }
1667                 goto start;
1668                 }
1669
1670         switch (rr->type)
1671                 {
1672         default:
1673 #ifndef OPENSSL_NO_TLS
1674                 /* TLS up to v1.1 just ignores unknown message types:
1675                  * TLS v1.2 give an unexpected message alert.
1676                  */
1677                 if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION)
1678                         {
1679                         rr->length = 0;
1680                         goto start;
1681                         }
1682 #endif
1683                 al=SSL_AD_UNEXPECTED_MESSAGE;
1684                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1685                 goto f_err;
1686         case SSL3_RT_CHANGE_CIPHER_SPEC:
1687         case SSL3_RT_ALERT:
1688         case SSL3_RT_HANDSHAKE:
1689                 /* we already handled all of these, with the possible exception
1690                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1691                  * should not happen when type != rr->type */
1692                 al=SSL_AD_UNEXPECTED_MESSAGE;
1693                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1694                 goto f_err;
1695         case SSL3_RT_APPLICATION_DATA:
1696                 /* At this point, we were expecting handshake data,
1697                  * but have application data.  If the library was
1698                  * running inside ssl3_read() (i.e. in_read_app_data
1699                  * is set) and it makes sense to read application data
1700                  * at this point (session renegotiation not yet started),
1701                  * we will indulge it.
1702                  */
1703                 if (s->s3->in_read_app_data &&
1704                         (s->s3->total_renegotiations != 0) &&
1705                         ((
1706                                 (s->state & SSL_ST_CONNECT) &&
1707                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1708                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1709                                 ) || (
1710                                         (s->state & SSL_ST_ACCEPT) &&
1711                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1712                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1713                                         )
1714                                 ))
1715                         {
1716                         s->s3->in_read_app_data=2;
1717                         return(-1);
1718                         }
1719                 else
1720                         {
1721                         al=SSL_AD_UNEXPECTED_MESSAGE;
1722                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1723                         goto f_err;
1724                         }
1725                 }
1726         /* not reached */
1727
1728 f_err:
1729         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1730 err:
1731         return(-1);
1732         }
1733
1734 int ssl3_do_change_cipher_spec(SSL *s)
1735         {
1736         int i;
1737         const char *sender;
1738         int slen;
1739
1740         if (s->state & SSL_ST_ACCEPT)
1741                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1742         else
1743                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1744
1745         if (s->s3->tmp.key_block == NULL)
1746                 {
1747                 if (s->session == NULL || s->session->master_key_length == 0)
1748                         {
1749                         /* might happen if dtls1_read_bytes() calls this */
1750                         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1751                         return (0);
1752                         }
1753
1754                 s->session->cipher=s->s3->tmp.new_cipher;
1755                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1756                 }
1757
1758         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1759                 return(0);
1760
1761         /* we have to record the message digest at
1762          * this point so we can get it before we read
1763          * the finished message */
1764         if (s->state & SSL_ST_CONNECT)
1765                 {
1766                 sender=s->method->ssl3_enc->server_finished_label;
1767                 slen=s->method->ssl3_enc->server_finished_label_len;
1768                 }
1769         else
1770                 {
1771                 sender=s->method->ssl3_enc->client_finished_label;
1772                 slen=s->method->ssl3_enc->client_finished_label_len;
1773                 }
1774
1775         i = s->method->ssl3_enc->final_finish_mac(s,
1776                 sender,slen,s->s3->tmp.peer_finish_md);
1777         if (i == 0)
1778                 {
1779                 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
1780                 return 0;
1781                 }
1782         s->s3->tmp.peer_finish_md_len = i;
1783
1784         return(1);
1785         }
1786
1787 int ssl3_send_alert(SSL *s, int level, int desc)
1788         {
1789         /* Map tls/ssl alert value to correct one */
1790         desc=s->method->ssl3_enc->alert_value(desc);
1791         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1792                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1793         if (desc < 0) return -1;
1794         /* If a fatal one, remove from cache */
1795         if ((level == SSL3_AL_FATAL) && (s->session != NULL))
1796                 SSL_CTX_remove_session(s->ctx,s->session);
1797
1798         s->s3->alert_dispatch=1;
1799         s->s3->send_alert[0]=level;
1800         s->s3->send_alert[1]=desc;
1801         if (s->s3->wbuf.left == 0) /* data still being written out? */
1802                 return s->method->ssl_dispatch_alert(s);
1803         /* else data is still being written out, we will get written
1804          * some time in the future */
1805         return -1;
1806         }
1807
1808 int ssl3_dispatch_alert(SSL *s)
1809         {
1810         int i,j;
1811         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1812
1813         s->s3->alert_dispatch=0;
1814         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1815         if (i <= 0)
1816                 {
1817                 s->s3->alert_dispatch=1;
1818                 }
1819         else
1820                 {
1821                 /* Alert sent to BIO.  If it is important, flush it now.
1822                  * If the message does not get sent due to non-blocking IO,
1823                  * we will not worry too much. */
1824                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1825                         (void)BIO_flush(s->wbio);
1826
1827                 if (s->msg_callback)
1828                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1829
1830                 if (s->info_callback != NULL)
1831                         cb=s->info_callback;
1832                 else if (s->ctx->info_callback != NULL)
1833                         cb=s->ctx->info_callback;
1834
1835                 if (cb != NULL)
1836                         {
1837                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1838                         cb(s,SSL_CB_WRITE_ALERT,j);
1839                         }
1840                 }
1841         return(i);
1842         }