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 119static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, 120 unsigned int len, int create_empty_fragment); 121static int ssl3_get_record(SSL *s); 122 123int 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,off,newb; 133 134 if (!extend) 135 { 136 /* start with empty packet ... */ 137 if (s->s3->rbuf.left == 0) 138 s->s3->rbuf.offset = 0; 139 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset; 140 s->packet_length = 0; 141 /* ... now we can act as if 'extend' was set */ 142 } 143 144 /* extend reads should not span multiple packets for DTLS */ 145 if ( SSL_version(s) == DTLS1_VERSION && 146 extend) 147 { 148 if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left) 149 n = s->s3->rbuf.left; 150 } 151 152 /* if there is enough in the buffer from a previous read, take some */ 153 if (s->s3->rbuf.left >= (int)n) 154 { 155 s->packet_length+=n; 156 s->s3->rbuf.left-=n; 157 s->s3->rbuf.offset+=n; 158 return(n); 159 } 160 161 /* else we need to read more data */ 162 if (!s->read_ahead) 163 max=n; 164 165 { 166 /* avoid buffer overflow */ 167 int max_max = s->s3->rbuf.len - s->packet_length; 168 if (max > max_max) 169 max = max_max; 170 } 171 if (n > max) /* does not happen */ 172 { 173 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR); 174 return -1; 175 } 176 177 off = s->packet_length; 178 newb = s->s3->rbuf.left; 179 /* Move any available bytes to front of buffer: 180 * 'off' bytes already pointed to by 'packet', 181 * 'newb' extra ones at the end */ 182 if (s->packet != s->s3->rbuf.buf) 183 { 184 /* off > 0 */ 185 memmove(s->s3->rbuf.buf, s->packet, off+newb); 186 s->packet = s->s3->rbuf.buf; 187 } 188 189 while (newb < n) 190 { 191 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need 192 * to read in more until we have off+n (up to off+max if possible) */ 193 194 clear_sys_error(); 195 if (s->rbio != NULL) 196 { 197 s->rwstate=SSL_READING; 198 i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb); 199 } 200 else 201 { 202 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET); 203 i = -1; 204 } 205 206 if (i <= 0) 207 { 208 s->s3->rbuf.left = newb; 209 return(i); 210 } 211 newb+=i; 212 } 213 214 /* done reading, now the book-keeping */ 215 s->s3->rbuf.offset = off + n; 216 s->s3->rbuf.left = newb - n; 217 s->packet_length += n; 218 s->rwstate=SSL_NOTHING; 219 return(n); 220 } 221 222/* Call this to get a new input record. 223 * It will return <= 0 if more data is needed, normally due to an error 224 * or non-blocking IO. 225 * When it finishes, one packet has been decoded and can be found in 226 * ssl->s3->rrec.type - is the type of record 227 * ssl->s3->rrec.data, - data 228 * ssl->s3->rrec.length, - number of bytes 229 */ 230/* used only by ssl3_read_bytes */ 231static int ssl3_get_record(SSL *s) 232 { 233 int ssl_major,ssl_minor,al; 234 int enc_err,n,i,ret= -1; 235 SSL3_RECORD *rr; 236 SSL_SESSION *sess; 237 unsigned char *p; 238 unsigned char md[EVP_MAX_MD_SIZE]; 239 short version; 240 unsigned int mac_size; 241 int clear=0; 242 size_t extra; 243 int decryption_failed_or_bad_record_mac = 0; 244 unsigned char *mac = NULL; 245 246 rr= &(s->s3->rrec); 247 sess=s->session; 248 249 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) 250 extra=SSL3_RT_MAX_EXTRA; 251 else 252 extra=0; 253 if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE) 254 { 255 /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER 256 * set after ssl3_setup_buffers() was done */ 257 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); 258 return -1; 259 } 260 261again: 262 /* check if we have the header */ 263 if ( (s->rstate != SSL_ST_READ_BODY) || 264 (s->packet_length < SSL3_RT_HEADER_LENGTH)) 265 { 266 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); 267 if (n <= 0) return(n); /* error or non-blocking */ 268 s->rstate=SSL_ST_READ_BODY; 269 270 p=s->packet; 271 272 /* Pull apart the header into the SSL3_RECORD */ 273 rr->type= *(p++); 274 ssl_major= *(p++); 275 ssl_minor= *(p++); 276 version=(ssl_major<<8)|ssl_minor; 277 n2s(p,rr->length); 278 279 /* Lets check version */ 280 if (!s->first_packet) 281 { 282 if (version != s->version) 283 { 284 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); 285 /* Send back error using their 286 * version number :-) */ 287 s->version=version; 288 al=SSL_AD_PROTOCOL_VERSION; 289 goto f_err; 290 } 291 } 292 293 if ((version>>8) != SSL3_VERSION_MAJOR) 294 { 295 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); 296 goto err; 297 } 298 299 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) 300 { 301 al=SSL_AD_RECORD_OVERFLOW; 302 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG); 303 goto f_err; 304 } 305 306 /* now s->rstate == SSL_ST_READ_BODY */ 307 } 308 309 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ 310 311 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH) 312 { 313 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ 314 i=rr->length; 315 n=ssl3_read_n(s,i,i,1); 316 if (n <= 0) return(n); /* error or non-blocking io */ 317 /* now n == rr->length, 318 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */ 319 } 320 321 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ 322 323 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, 324 * and we have that many bytes in s->packet 325 */ 326 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]); 327 328 /* ok, we can now read from 's->packet' data into 'rr' 329 * rr->input points at rr->length bytes, which 330 * need to be copied into rr->data by either 331 * the decryption or by the decompression 332 * When the data is 'copied' into the rr->data buffer, 333 * rr->input will be pointed at the new buffer */ 334 335 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] 336 * rr->length bytes of encrypted compressed stuff. */ 337 338 /* check is not needed I believe */ 339 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) 340 { 341 al=SSL_AD_RECORD_OVERFLOW; 342 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); 343 goto f_err; 344 } 345 346 /* decrypt in place in 'rr->input' */ 347 rr->data=rr->input; 348 349 enc_err = s->method->ssl3_enc->enc(s,0); 350 if (enc_err <= 0) 351 { 352 if (enc_err == 0) 353 /* SSLerr() and ssl3_send_alert() have been called */ 354 goto err; 355 356 /* Otherwise enc_err == -1, which indicates bad padding 357 * (rec->length has not been changed in this case). 358 * To minimize information leaked via timing, we will perform 359 * the MAC computation anyway. */ 360 decryption_failed_or_bad_record_mac = 1; 361 } 362 363#ifdef TLS_DEBUG 364printf("dec %d\n",rr->length); 365{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } 366printf("\n"); 367#endif 368 369 /* r->length is now the compressed data plus mac */ 370 if ( (sess == NULL) || 371 (s->enc_read_ctx == NULL) || 372 (s->read_hash == NULL)) 373 clear=1; 374 375 if (!clear) 376 { 377 mac_size=EVP_MD_size(s->read_hash); 378 379 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size) 380 { 381#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ 382 al=SSL_AD_RECORD_OVERFLOW; 383 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); 384 goto f_err; 385#else 386 decryption_failed_or_bad_record_mac = 1; 387#endif 388 } 389 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ 390 if (rr->length >= mac_size) 391 { 392 rr->length -= mac_size; 393 mac = &rr->data[rr->length]; 394 } 395 else 396 { 397 /* record (minus padding) is too short to contain a MAC */ 398#if 0 /* OK only for stream ciphers */ 399 al=SSL_AD_DECODE_ERROR; 400 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT); 401 goto f_err; 402#else 403 decryption_failed_or_bad_record_mac = 1; 404 rr->length = 0; 405#endif 406 } 407 i=s->method->ssl3_enc->mac(s,md,0); 408 if (mac == NULL || memcmp(md, mac, mac_size) != 0) 409 { 410 decryption_failed_or_bad_record_mac = 1; 411 } 412 } 413 414 if (decryption_failed_or_bad_record_mac) 415 { 416 /* A separate 'decryption_failed' alert was introduced with TLS 1.0, 417 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption 418 * failure is directly visible from the ciphertext anyway, 419 * we should not reveal which kind of error occured -- this 420 * might become visible to an attacker (e.g. via a logfile) */ 421 al=SSL_AD_BAD_RECORD_MAC; 422 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); 423 goto f_err; 424 } 425 426 /* r->length is now just compressed */ 427 if (s->expand != NULL) 428 { 429 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra) 430 { 431 al=SSL_AD_RECORD_OVERFLOW; 432 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); 433 goto f_err; 434 } 435 if (!ssl3_do_uncompress(s)) 436 { 437 al=SSL_AD_DECOMPRESSION_FAILURE; 438 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION); 439 goto f_err; 440 } 441 } 442 443 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra) 444 { 445 al=SSL_AD_RECORD_OVERFLOW; 446 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); 447 goto f_err; 448 } 449 450 rr->off=0; 451 /* So at this point the following is true 452 * ssl->s3->rrec.type is the type of record 453 * ssl->s3->rrec.length == number of bytes in record 454 * ssl->s3->rrec.off == offset to first valid byte 455 * ssl->s3->rrec.data == where to take bytes from, increment 456 * after use :-). 457 */ 458 459 /* we have pulled in a full packet so zero things */ 460 s->packet_length=0; 461 462 /* just read a 0 length packet */ 463 if (rr->length == 0) goto again; 464 465 return(1); 466 467f_err: 468 ssl3_send_alert(s,SSL3_AL_FATAL,al); 469err: 470 return(ret); 471 } 472 473int ssl3_do_uncompress(SSL *ssl) 474 { 475#ifndef OPENSSL_NO_COMP 476 int i; 477 SSL3_RECORD *rr; 478 479 rr= &(ssl->s3->rrec); 480 i=COMP_expand_block(ssl->expand,rr->comp, 481 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length); 482 if (i < 0) 483 return(0); 484 else 485 rr->length=i; 486 rr->data=rr->comp; 487#endif 488 return(1); 489 } 490 491int ssl3_do_compress(SSL *ssl) 492 { 493#ifndef OPENSSL_NO_COMP 494 int i; 495 SSL3_RECORD *wr; 496 497 wr= &(ssl->s3->wrec); 498 i=COMP_compress_block(ssl->compress,wr->data, 499 SSL3_RT_MAX_COMPRESSED_LENGTH, 500 wr->input,(int)wr->length); 501 if (i < 0) 502 return(0); 503 else 504 wr->length=i; 505 506 wr->input=wr->data; 507#endif 508 return(1); 509 } 510 511/* Call this to write data in records of type 'type' 512 * It will return <= 0 if not all data has been sent or non-blocking IO. 513 */ 514int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) 515 { 516 const unsigned char *buf=buf_; 517 unsigned int tot,n,nw; 518 int i; 519 520 s->rwstate=SSL_NOTHING; 521 tot=s->s3->wnum; 522 s->s3->wnum=0; 523 524 if (SSL_in_init(s) && !s->in_handshake) 525 { 526 i=s->handshake_func(s); 527 if (i < 0) return(i); 528 if (i == 0) 529 { 530 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 531 return -1; 532 } 533 } 534 535 n=(len-tot); 536 for (;;) 537 { 538 if (n > SSL3_RT_MAX_PLAIN_LENGTH) 539 nw=SSL3_RT_MAX_PLAIN_LENGTH; 540 else 541 nw=n; 542 543 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0); 544 if (i <= 0) 545 { 546 s->s3->wnum=tot; 547 return i; 548 } 549 550 if ((i == (int)n) || 551 (type == SSL3_RT_APPLICATION_DATA && 552 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) 553 { 554 /* next chunk of data should get another prepended empty fragment 555 * in ciphersuites with known-IV weakness: */ 556 s->s3->empty_fragment_done = 0; 557 558 return tot+i; 559 } 560 561 n-=i; 562 tot+=i; 563 } 564 } 565 566static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, 567 unsigned int len, int create_empty_fragment) 568 { 569 unsigned char *p,*plen; 570 int i,mac_size,clear=0; 571 int prefix_len = 0; 572 SSL3_RECORD *wr; 573 SSL3_BUFFER *wb; 574 SSL_SESSION *sess; 575 576 /* first check if there is a SSL3_BUFFER still being written 577 * out. This will happen with non blocking IO */ 578 if (s->s3->wbuf.left != 0) 579 return(ssl3_write_pending(s,type,buf,len)); 580 581 /* If we have an alert to send, lets send it */ 582 if (s->s3->alert_dispatch) 583 { 584 i=s->method->ssl_dispatch_alert(s); 585 if (i <= 0) 586 return(i); 587 /* if it went, fall through and send more stuff */ 588 } 589 590 if (len == 0 && !create_empty_fragment) 591 return 0; 592 593 wr= &(s->s3->wrec); 594 wb= &(s->s3->wbuf); 595 sess=s->session; 596 597 if ( (sess == NULL) || 598 (s->enc_write_ctx == NULL) || 599 (s->write_hash == NULL)) 600 clear=1; 601 602 if (clear) 603 mac_size=0; 604 else 605 mac_size=EVP_MD_size(s->write_hash); 606 607 /* 'create_empty_fragment' is true only when this function calls itself */ 608 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) 609 { 610 /* countermeasure against known-IV weakness in CBC ciphersuites 611 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 612 613 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) 614 { 615 /* recursive function call with 'create_empty_fragment' set; 616 * this prepares and buffers the data for an empty fragment 617 * (these 'prefix_len' bytes are sent out later 618 * together with the actual payload) */ 619 prefix_len = do_ssl3_write(s, type, buf, 0, 1); 620 if (prefix_len <= 0) 621 goto err; 622 623 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) 624 { 625 /* insufficient space */ 626 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); 627 goto err; 628 } 629 } 630 631 s->s3->empty_fragment_done = 1; 632 } 633 634 p = wb->buf + prefix_len; 635 636 /* write the header */ 637 638 *(p++)=type&0xff; 639 wr->type=type; 640 641 *(p++)=(s->version>>8); 642 *(p++)=s->version&0xff; 643 644 /* field where we are to write out packet length */ 645 plen=p; 646 p+=2; 647 648 /* lets setup the record stuff. */ 649 wr->data=p; 650 wr->length=(int)len; 651 wr->input=(unsigned char *)buf; 652 653 /* we now 'read' from wr->input, wr->length bytes into 654 * wr->data */ 655 656 /* first we compress */ 657 if (s->compress != NULL) 658 { 659 if (!ssl3_do_compress(s)) 660 { 661 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE); 662 goto err; 663 } 664 } 665 else 666 { 667 memcpy(wr->data,wr->input,wr->length); 668 wr->input=wr->data; 669 } 670 671 /* we should still have the output to wr->data and the input 672 * from wr->input. Length should be wr->length. 673 * wr->data still points in the wb->buf */ 674 675 if (mac_size != 0) 676 { 677 s->method->ssl3_enc->mac(s,&(p[wr->length]),1); 678 wr->length+=mac_size; 679 wr->input=p; 680 wr->data=p; 681 } 682 683 /* ssl3_enc can only have an error on read */ 684 s->method->ssl3_enc->enc(s,1); 685 686 /* record length after mac and block padding */ 687 s2n(wr->length,plen); 688 689 /* we should now have 690 * wr->data pointing to the encrypted data, which is 691 * wr->length long */ 692 wr->type=type; /* not needed but helps for debugging */ 693 wr->length+=SSL3_RT_HEADER_LENGTH; 694 695 if (create_empty_fragment) 696 { 697 /* we are in a recursive call; 698 * just return the length, don't write out anything here 699 */ 700 return wr->length; 701 } 702 703 /* now let's set up wb */ 704 wb->left = prefix_len + wr->length; 705 wb->offset = 0; 706 707 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ 708 s->s3->wpend_tot=len; 709 s->s3->wpend_buf=buf; 710 s->s3->wpend_type=type; 711 s->s3->wpend_ret=len; 712 713 /* we now just need to write the buffer */ 714 return ssl3_write_pending(s,type,buf,len); 715err: 716 return -1; 717 } 718 719/* if s->s3->wbuf.left != 0, we need to call this */ 720int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, 721 unsigned int len) 722 { 723 int i; 724 725/* XXXX */ 726 if ((s->s3->wpend_tot > (int)len) 727 || ((s->s3->wpend_buf != buf) && 728 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) 729 || (s->s3->wpend_type != type)) 730 { 731 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 732 return(-1); 733 } 734 735 for (;;) 736 { 737 clear_sys_error(); 738 if (s->wbio != NULL) 739 { 740 s->rwstate=SSL_WRITING; 741 i=BIO_write(s->wbio, 742 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]), 743 (unsigned int)s->s3->wbuf.left); 744 } 745 else 746 { 747 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET); 748 i= -1; 749 } 750 if (i == s->s3->wbuf.left) 751 { 752 s->s3->wbuf.left=0; 753 s->rwstate=SSL_NOTHING; 754 return(s->s3->wpend_ret); 755 } 756 else if (i <= 0) 757 return(i); 758 s->s3->wbuf.offset+=i; 759 s->s3->wbuf.left-=i; 760 } 761 } 762 763/* Return up to 'len' payload bytes received in 'type' records. 764 * 'type' is one of the following: 765 * 766 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) 767 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) 768 * - 0 (during a shutdown, no data has to be returned) 769 * 770 * If we don't have stored data to work from, read a SSL/TLS record first 771 * (possibly multiple records if we still don't have anything to return). 772 * 773 * This function must handle any surprises the peer may have for us, such as 774 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really 775 * a surprise, but handled as if it were), or renegotiation requests. 776 * Also if record payloads contain fragments too small to process, we store 777 * them until there is enough for the respective protocol (the record protocol 778 * may use arbitrary fragmentation and even interleaving): 779 * Change cipher spec protocol 780 * just 1 byte needed, no need for keeping anything stored 781 * Alert protocol 782 * 2 bytes needed (AlertLevel, AlertDescription) 783 * Handshake protocol 784 * 4 bytes needed (HandshakeType, uint24 length) -- we just have 785 * to detect unexpected Client Hello and Hello Request messages 786 * here, anything else is handled by higher layers 787 * Application data protocol 788 * none of our business 789 */ 790int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) 791 { 792 int al,i,j,ret; 793 unsigned int n; 794 SSL3_RECORD *rr; 795 void (*cb)(const SSL *ssl,int type2,int val)=NULL; 796 797 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ 798 if (!ssl3_setup_buffers(s)) 799 return(-1); 800 801 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || 802 (peek && (type != SSL3_RT_APPLICATION_DATA))) 803 { 804 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); 805 return -1; 806 } 807 808 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0)) 809 /* (partially) satisfy request from storage */ 810 { 811 unsigned char *src = s->s3->handshake_fragment; 812 unsigned char *dst = buf; 813 unsigned int k; 814 815 /* peek == 0 */ 816 n = 0; 817 while ((len > 0) && (s->s3->handshake_fragment_len > 0)) 818 { 819 *dst++ = *src++; 820 len--; s->s3->handshake_fragment_len--; 821 n++; 822 } 823 /* move any remaining fragment bytes: */ 824 for (k = 0; k < s->s3->handshake_fragment_len; k++) 825 s->s3->handshake_fragment[k] = *src++; 826 return n; 827 } 828 829 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ 830 831 if (!s->in_handshake && SSL_in_init(s)) 832 { 833 /* type == SSL3_RT_APPLICATION_DATA */ 834 i=s->handshake_func(s); 835 if (i < 0) return(i); 836 if (i == 0) 837 { 838 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 839 return(-1); 840 } 841 } 842start: 843 s->rwstate=SSL_NOTHING; 844 845 /* s->s3->rrec.type - is the type of record 846 * s->s3->rrec.data, - data 847 * s->s3->rrec.off, - offset into 'data' for next read 848 * s->s3->rrec.length, - number of bytes. */ 849 rr = &(s->s3->rrec); 850 851 /* get new packet if necessary */ 852 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) 853 { 854 ret=ssl3_get_record(s); 855 if (ret <= 0) return(ret); 856 } 857 858 /* we now have a packet which can be read and processed */ 859 860 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, 861 * reset by ssl3_get_finished */ 862 && (rr->type != SSL3_RT_HANDSHAKE)) 863 { 864 al=SSL_AD_UNEXPECTED_MESSAGE; 865 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); 866 goto f_err; 867 } 868 869 /* If the other end has shut down, throw anything we read away 870 * (even in 'peek' mode) */ 871 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) 872 { 873 rr->length=0; 874 s->rwstate=SSL_NOTHING; 875 return(0); 876 } 877 878 879 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ 880 { 881 /* make sure that we are not getting application data when we 882 * are doing a handshake for the first time */ 883 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && 884 (s->enc_read_ctx == NULL)) 885 { 886 al=SSL_AD_UNEXPECTED_MESSAGE; 887 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); 888 goto f_err; 889 } 890 891 if (len <= 0) return(len); 892 893 if ((unsigned int)len > rr->length) 894 n = rr->length; 895 else 896 n = (unsigned int)len; 897 898 memcpy(buf,&(rr->data[rr->off]),n); 899 if (!peek) 900 { 901 rr->length-=n; 902 rr->off+=n; 903 if (rr->length == 0) 904 { 905 s->rstate=SSL_ST_READ_HEADER; 906 rr->off=0; 907 } 908 } 909 return(n); 910 } 911 912 913 /* If we get here, then type != rr->type; if we have a handshake 914 * message, then it was unexpected (Hello Request or Client Hello). */ 915 916 /* In case of record types for which we have 'fragment' storage, 917 * fill that so that we can process the data at a fixed place. 918 */ 919 { 920 unsigned int dest_maxlen = 0; 921 unsigned char *dest = NULL; 922 unsigned int *dest_len = NULL; 923 924 if (rr->type == SSL3_RT_HANDSHAKE) 925 { 926 dest_maxlen = sizeof s->s3->handshake_fragment; 927 dest = s->s3->handshake_fragment; 928 dest_len = &s->s3->handshake_fragment_len; 929 } 930 else if (rr->type == SSL3_RT_ALERT) 931 { 932 dest_maxlen = sizeof s->s3->alert_fragment; 933 dest = s->s3->alert_fragment; 934 dest_len = &s->s3->alert_fragment_len; 935 } 936 937 if (dest_maxlen > 0) 938 { 939 n = dest_maxlen - *dest_len; /* available space in 'dest' */ 940 if (rr->length < n) 941 n = rr->length; /* available bytes */ 942 943 /* now move 'n' bytes: */ 944 while (n-- > 0) 945 { 946 dest[(*dest_len)++] = rr->data[rr->off++]; 947 rr->length--; 948 } 949 950 if (*dest_len < dest_maxlen) 951 goto start; /* fragment was too small */ 952 } 953 } 954 955 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; 956 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. 957 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ 958 959 /* If we are a client, check for an incoming 'Hello Request': */ 960 if ((!s->server) && 961 (s->s3->handshake_fragment_len >= 4) && 962 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && 963 (s->session != NULL) && (s->session->cipher != NULL)) 964 { 965 s->s3->handshake_fragment_len = 0; 966 967 if ((s->s3->handshake_fragment[1] != 0) || 968 (s->s3->handshake_fragment[2] != 0) || 969 (s->s3->handshake_fragment[3] != 0)) 970 { 971 al=SSL_AD_DECODE_ERROR; 972 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); 973 goto f_err; 974 } 975 976 if (s->msg_callback) 977 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg); 978 979 if (SSL_is_init_finished(s) && 980 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && 981 !s->s3->renegotiate) 982 { 983 ssl3_renegotiate(s); 984 if (ssl3_renegotiate_check(s)) 985 { 986 i=s->handshake_func(s); 987 if (i < 0) return(i); 988 if (i == 0) 989 { 990 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 991 return(-1); 992 } 993 994 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 995 { 996 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 997 { 998 BIO *bio; 999 /* In the case where we try to read application data, 1000 * but we trigger an SSL handshake, we return -1 with 1001 * the retry option set. Otherwise renegotiation may 1002 * cause nasty problems in the blocking world */ 1003 s->rwstate=SSL_READING; 1004 bio=SSL_get_rbio(s); 1005 BIO_clear_retry_flags(bio); 1006 BIO_set_retry_read(bio); 1007 return(-1); 1008 } 1009 } 1010 } 1011 } 1012 /* we either finished a handshake or ignored the request, 1013 * now try again to obtain the (application) data we were asked for */ 1014 goto start; 1015 } 1016 1017 if (s->s3->alert_fragment_len >= 2) 1018 { 1019 int alert_level = s->s3->alert_fragment[0]; 1020 int alert_descr = s->s3->alert_fragment[1]; 1021 1022 s->s3->alert_fragment_len = 0; 1023 1024 if (s->msg_callback) 1025 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg); 1026 1027 if (s->info_callback != NULL) 1028 cb=s->info_callback; 1029 else if (s->ctx->info_callback != NULL) 1030 cb=s->ctx->info_callback; 1031 1032 if (cb != NULL) 1033 { 1034 j = (alert_level << 8) | alert_descr; 1035 cb(s, SSL_CB_READ_ALERT, j); 1036 } 1037 1038 if (alert_level == 1) /* warning */ 1039 { 1040 s->s3->warn_alert = alert_descr; 1041 if (alert_descr == SSL_AD_CLOSE_NOTIFY) 1042 { 1043 s->shutdown |= SSL_RECEIVED_SHUTDOWN; 1044 return(0); 1045 } 1046 } 1047 else if (alert_level == 2) /* fatal */ 1048 { 1049 char tmp[16]; 1050 1051 s->rwstate=SSL_NOTHING; 1052 s->s3->fatal_alert = alert_descr; 1053 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); 1054 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); 1055 ERR_add_error_data(2,"SSL alert number ",tmp); 1056 s->shutdown|=SSL_RECEIVED_SHUTDOWN; 1057 SSL_CTX_remove_session(s->ctx,s->session); 1058 return(0); 1059 } 1060 else 1061 { 1062 al=SSL_AD_ILLEGAL_PARAMETER; 1063 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); 1064 goto f_err; 1065 } 1066 1067 goto start; 1068 } 1069 1070 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ 1071 { 1072 s->rwstate=SSL_NOTHING; 1073 rr->length=0; 1074 return(0); 1075 } 1076 1077 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1078 { 1079 /* 'Change Cipher Spec' is just a single byte, so we know 1080 * exactly what the record payload has to look like */ 1081 if ( (rr->length != 1) || (rr->off != 0) || 1082 (rr->data[0] != SSL3_MT_CCS)) 1083 { 1084 al=SSL_AD_ILLEGAL_PARAMETER; 1085 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); 1086 goto f_err; 1087 } 1088 1089 /* Check we have a cipher to change to */ 1090 if (s->s3->tmp.new_cipher == NULL) 1091 { 1092 al=SSL_AD_UNEXPECTED_MESSAGE; 1093 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY); 1094 goto f_err; 1095 } 1096 1097 rr->length=0; 1098 1099 if (s->msg_callback) 1100 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); 1101 1102 s->s3->change_cipher_spec=1; 1103 if (!ssl3_do_change_cipher_spec(s)) 1104 goto err; 1105 else 1106 goto start; 1107 } 1108 1109 /* Unexpected handshake message (Client Hello, or protocol violation) */ 1110 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) 1111 { 1112 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && 1113 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) 1114 { 1115#if 0 /* worked only because C operator preferences are not as expected (and 1116 * because this is not really needed for clients except for detecting 1117 * protocol violations): */ 1118 s->state=SSL_ST_BEFORE|(s->server) 1119 ?SSL_ST_ACCEPT 1120 :SSL_ST_CONNECT; 1121#else 1122 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; 1123#endif 1124 s->new_session=1; 1125 } 1126 i=s->handshake_func(s); 1127 if (i < 0) return(i); 1128 if (i == 0) 1129 { 1130 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1131 return(-1); 1132 } 1133 1134 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 1135 { 1136 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 1137 { 1138 BIO *bio; 1139 /* In the case where we try to read application data, 1140 * but we trigger an SSL handshake, we return -1 with 1141 * the retry option set. Otherwise renegotiation may 1142 * cause nasty problems in the blocking world */ 1143 s->rwstate=SSL_READING; 1144 bio=SSL_get_rbio(s); 1145 BIO_clear_retry_flags(bio); 1146 BIO_set_retry_read(bio); 1147 return(-1); 1148 } 1149 } 1150 goto start; 1151 } 1152 1153 switch (rr->type) 1154 { 1155 default: 1156#ifndef OPENSSL_NO_TLS 1157 /* TLS just ignores unknown message types */ 1158 if (s->version == TLS1_VERSION) 1159 { 1160 rr->length = 0; 1161 goto start; 1162 } 1163#endif 1164 al=SSL_AD_UNEXPECTED_MESSAGE; 1165 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1166 goto f_err; 1167 case SSL3_RT_CHANGE_CIPHER_SPEC: 1168 case SSL3_RT_ALERT: 1169 case SSL3_RT_HANDSHAKE: 1170 /* we already handled all of these, with the possible exception 1171 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that 1172 * should not happen when type != rr->type */ 1173 al=SSL_AD_UNEXPECTED_MESSAGE; 1174 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR); 1175 goto f_err; 1176 case SSL3_RT_APPLICATION_DATA: 1177 /* At this point, we were expecting handshake data, 1178 * but have application data. If the library was 1179 * running inside ssl3_read() (i.e. in_read_app_data 1180 * is set) and it makes sense to read application data 1181 * at this point (session renegotiation not yet started), 1182 * we will indulge it. 1183 */ 1184 if (s->s3->in_read_app_data && 1185 (s->s3->total_renegotiations != 0) && 1186 (( 1187 (s->state & SSL_ST_CONNECT) && 1188 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && 1189 (s->state <= SSL3_ST_CR_SRVR_HELLO_A) 1190 ) || ( 1191 (s->state & SSL_ST_ACCEPT) && 1192 (s->state <= SSL3_ST_SW_HELLO_REQ_A) && 1193 (s->state >= SSL3_ST_SR_CLNT_HELLO_A) 1194 ) 1195 )) 1196 { 1197 s->s3->in_read_app_data=2; 1198 return(-1); 1199 } 1200 else 1201 { 1202 al=SSL_AD_UNEXPECTED_MESSAGE; 1203 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1204 goto f_err; 1205 } 1206 } 1207 /* not reached */ 1208 1209f_err: 1210 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1211err: 1212 return(-1); 1213 } 1214 1215int ssl3_do_change_cipher_spec(SSL *s) 1216 { 1217 int i; 1218 const char *sender; 1219 int slen; 1220 1221 if (s->state & SSL_ST_ACCEPT) 1222 i=SSL3_CHANGE_CIPHER_SERVER_READ; 1223 else 1224 i=SSL3_CHANGE_CIPHER_CLIENT_READ; 1225 1226 if (s->s3->tmp.key_block == NULL) 1227 { 1228 s->session->cipher=s->s3->tmp.new_cipher; 1229 if (!s->method->ssl3_enc->setup_key_block(s)) return(0); 1230 } 1231 1232 if (!s->method->ssl3_enc->change_cipher_state(s,i)) 1233 return(0); 1234 1235 /* we have to record the message digest at 1236 * this point so we can get it before we read 1237 * the finished message */ 1238 if (s->state & SSL_ST_CONNECT) 1239 { 1240 sender=s->method->ssl3_enc->server_finished_label; 1241 slen=s->method->ssl3_enc->server_finished_label_len; 1242 } 1243 else 1244 { 1245 sender=s->method->ssl3_enc->client_finished_label; 1246 slen=s->method->ssl3_enc->client_finished_label_len; 1247 } 1248 1249 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, 1250 &(s->s3->finish_dgst1), 1251 &(s->s3->finish_dgst2), 1252 sender,slen,s->s3->tmp.peer_finish_md); 1253 1254 return(1); 1255 } 1256 1257void ssl3_send_alert(SSL *s, int level, int desc) 1258 { 1259 /* Map tls/ssl alert value to correct one */ 1260 desc=s->method->ssl3_enc->alert_value(desc); 1261 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) 1262 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */ 1263 if (desc < 0) return; 1264 /* If a fatal one, remove from cache */ 1265 if ((level == 2) && (s->session != NULL)) 1266 SSL_CTX_remove_session(s->ctx,s->session); 1267 1268 s->s3->alert_dispatch=1; 1269 s->s3->send_alert[0]=level; 1270 s->s3->send_alert[1]=desc; 1271 if (s->s3->wbuf.left == 0) /* data still being written out? */ 1272 s->method->ssl_dispatch_alert(s); 1273 /* else data is still being written out, we will get written 1274 * some time in the future */ 1275 } 1276 1277int ssl3_dispatch_alert(SSL *s) 1278 { 1279 int i,j; 1280 void (*cb)(const SSL *ssl,int type,int val)=NULL; 1281 1282 s->s3->alert_dispatch=0; 1283 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0); 1284 if (i <= 0) 1285 { 1286 s->s3->alert_dispatch=1; 1287 } 1288 else 1289 { 1290 /* Alert sent to BIO. If it is important, flush it now. 1291 * If the message does not get sent due to non-blocking IO, 1292 * we will not worry too much. */ 1293 if (s->s3->send_alert[0] == SSL3_AL_FATAL) 1294 (void)BIO_flush(s->wbio); 1295 1296 if (s->msg_callback) 1297 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); 1298 1299 if (s->info_callback != NULL) 1300 cb=s->info_callback; 1301 else if (s->ctx->info_callback != NULL) 1302 cb=s->ctx->info_callback; 1303 1304 if (cb != NULL) 1305 { 1306 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; 1307 cb(s,SSL_CB_WRITE_ALERT,j); 1308 } 1309 } 1310 return(i); 1311 } 1312