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_write_pending(SSL *s, int type, const unsigned char *buf, 122 unsigned int len); 123static int ssl3_get_record(SSL *s); 124static int do_compress(SSL *ssl); 125static int do_uncompress(SSL *ssl); 126static int do_change_cipher_spec(SSL *ssl); 127 128/* used only by ssl3_get_record */ 129static int ssl3_read_n(SSL *s, int n, int max, int extend) 130 { 131 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase 132 * packet by another n bytes. 133 * The packet will be in the sub-array of s->s3->rbuf.buf specified 134 * by s->packet and s->packet_length. 135 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf 136 * [plus s->packet_length bytes if extend == 1].) 137 */ 138 int i,off,newb; 139 140 if (!extend) 141 { 142 /* start with empty packet ... */ 143 if (s->s3->rbuf.left == 0) 144 s->s3->rbuf.offset = 0; 145 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset; 146 s->packet_length = 0; 147 /* ... now we can act as if 'extend' was set */ 148 } 149 150 /* if there is enough in the buffer from a previous read, take some */ 151 if (s->s3->rbuf.left >= (int)n) 152 { 153 s->packet_length+=n; 154 s->s3->rbuf.left-=n; 155 s->s3->rbuf.offset+=n; 156 return(n); 157 } 158 159 /* else we need to read more data */ 160 if (!s->read_ahead) 161 max=n; 162 163 { 164 /* avoid buffer overflow */ 165 int max_max = s->s3->rbuf.len - s->packet_length; 166 if (max > max_max) 167 max = max_max; 168 } 169 if (n > max) /* does not happen */ 170 { 171 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR); 172 return -1; 173 } 174 175 off = s->packet_length; 176 newb = s->s3->rbuf.left; 177 /* Move any available bytes to front of buffer: 178 * 'off' bytes already pointed to by 'packet', 179 * 'newb' extra ones at the end */ 180 if (s->packet != s->s3->rbuf.buf) 181 { 182 /* off > 0 */ 183 memmove(s->s3->rbuf.buf, s->packet, off+newb); 184 s->packet = s->s3->rbuf.buf; 185 } 186 187 while (newb < n) 188 { 189 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need 190 * to read in more until we have off+n (up to off+max if possible) */ 191 192 clear_sys_error(); 193 if (s->rbio != NULL) 194 { 195 s->rwstate=SSL_READING; 196 i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb); 197 } 198 else 199 { 200 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET); 201 i = -1; 202 } 203 204 if (i <= 0) 205 { 206 s->s3->rbuf.left = newb; 207 return(i); 208 } 209 newb+=i; 210 } 211 212 /* done reading, now the book-keeping */ 213 s->s3->rbuf.offset = off + n; 214 s->s3->rbuf.left = newb - n; 215 s->packet_length += n; 216 s->rwstate=SSL_NOTHING; 217 return(n); 218 } 219 220/* Call this to get a new input record. 221 * It will return <= 0 if more data is needed, normally due to an error 222 * or non-blocking IO. 223 * When it finishes, one packet has been decoded and can be found in 224 * ssl->s3->rrec.type - is the type of record 225 * ssl->s3->rrec.data, - data 226 * ssl->s3->rrec.length, - number of bytes 227 */ 228/* used only by ssl3_read_bytes */ 229static int ssl3_get_record(SSL *s) 230 { 231 int ssl_major,ssl_minor,al; 232 int enc_err,n,i,ret= -1; 233 SSL3_RECORD *rr; 234 SSL_SESSION *sess; 235 unsigned char *p; 236 unsigned char md[EVP_MAX_MD_SIZE]; 237 short version; 238 unsigned int mac_size; 239 int clear=0; 240 size_t extra; 241 int decryption_failed_or_bad_record_mac = 0; 242 unsigned char *mac = NULL; 243 244 rr= &(s->s3->rrec); 245 sess=s->session; 246 247 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) 248 extra=SSL3_RT_MAX_EXTRA; 249 else 250 extra=0; 251 if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE) 252 { 253 /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER 254 * set after ssl3_setup_buffers() was done */ 255 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); 256 return -1; 257 } 258 259again: 260 /* check if we have the header */ 261 if ( (s->rstate != SSL_ST_READ_BODY) || 262 (s->packet_length < SSL3_RT_HEADER_LENGTH)) 263 { 264 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); 265 if (n <= 0) return(n); /* error or non-blocking */ 266 s->rstate=SSL_ST_READ_BODY; 267 268 p=s->packet; 269 270 /* Pull apart the header into the SSL3_RECORD */ 271 rr->type= *(p++); 272 ssl_major= *(p++); 273 ssl_minor= *(p++); 274 version=(ssl_major<<8)|ssl_minor; 275 n2s(p,rr->length); 276 277 /* Lets check version */ 278 if (s->first_packet) 279 { 280 s->first_packet=0; 281 } 282 else 283 { 284 if (version != s->version) 285 { 286 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); 287 /* Send back error using their 288 * version number :-) */ 289 s->version=version; 290 al=SSL_AD_PROTOCOL_VERSION; 291 goto f_err; 292 } 293 } 294 295 if ((version>>8) != SSL3_VERSION_MAJOR) 296 { 297 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); 298 goto err; 299 } 300 301 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) 302 { 303 al=SSL_AD_RECORD_OVERFLOW; 304 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG); 305 goto f_err; 306 } 307 308 /* now s->rstate == SSL_ST_READ_BODY */ 309 } 310 311 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ 312 313 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH) 314 { 315 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ 316 i=rr->length; 317 n=ssl3_read_n(s,i,i,1); 318 if (n <= 0) return(n); /* error or non-blocking io */ 319 /* now n == rr->length, 320 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */ 321 } 322 323 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ 324 325 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, 326 * and we have that many bytes in s->packet 327 */ 328 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]); 329 330 /* ok, we can now read from 's->packet' data into 'rr' 331 * rr->input points at rr->length bytes, which 332 * need to be copied into rr->data by either 333 * the decryption or by the decompression 334 * When the data is 'copied' into the rr->data buffer, 335 * rr->input will be pointed at the new buffer */ 336 337 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] 338 * rr->length bytes of encrypted compressed stuff. */ 339 340 /* check is not needed I believe */ 341 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) 342 { 343 al=SSL_AD_RECORD_OVERFLOW; 344 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); 345 goto f_err; 346 } 347 348 /* decrypt in place in 'rr->input' */ 349 rr->data=rr->input; 350 351 enc_err = s->method->ssl3_enc->enc(s,0); 352 if (enc_err <= 0) 353 { 354 if (enc_err == 0) 355 /* SSLerr() and ssl3_send_alert() have been called */ 356 goto err; 357 358 /* Otherwise enc_err == -1, which indicates bad padding 359 * (rec->length has not been changed in this case). 360 * To minimize information leaked via timing, we will perform 361 * the MAC computation anyway. */ 362 decryption_failed_or_bad_record_mac = 1; 363 } 364 365#ifdef TLS_DEBUG 366printf("dec %d\n",rr->length); 367{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } 368printf("\n"); 369#endif 370 371 /* r->length is now the compressed data plus mac */ 372 if ( (sess == NULL) || 373 (s->enc_read_ctx == NULL) || 374 (s->read_hash == NULL)) 375 clear=1; 376 377 if (!clear) 378 { 379 mac_size=EVP_MD_size(s->read_hash); 380 381 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size) 382 { 383#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ 384 al=SSL_AD_RECORD_OVERFLOW; 385 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); 386 goto f_err; 387#else 388 decryption_failed_or_bad_record_mac = 1; 389#endif 390 } 391 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ 392 if (rr->length >= mac_size) 393 { 394 rr->length -= mac_size; 395 mac = &rr->data[rr->length]; 396 } 397 else 398 { 399 /* record (minus padding) is too short to contain a MAC */ 400#if 0 /* OK only for stream ciphers */ 401 al=SSL_AD_DECODE_ERROR; 402 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT); 403 goto f_err; 404#else 405 decryption_failed_or_bad_record_mac = 1; 406 rr->length = 0; 407#endif 408 } 409 i=s->method->ssl3_enc->mac(s,md,0); 410 if (mac == NULL || memcmp(md, mac, mac_size) != 0) 411 { 412 decryption_failed_or_bad_record_mac = 1; 413 } 414 } 415 416 if (decryption_failed_or_bad_record_mac) 417 { 418 /* A separate 'decryption_failed' alert was introduced with TLS 1.0, 419 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption 420 * failure is directly visible from the ciphertext anyway, 421 * we should not reveal which kind of error occured -- this 422 * might become visible to an attacker (e.g. via a logfile) */ 423 al=SSL_AD_BAD_RECORD_MAC; 424 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); 425 goto f_err; 426 } 427 428 /* r->length is now just compressed */ 429 if (s->expand != NULL) 430 { 431 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra) 432 { 433 al=SSL_AD_RECORD_OVERFLOW; 434 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); 435 goto f_err; 436 } 437 if (!do_uncompress(s)) 438 { 439 al=SSL_AD_DECOMPRESSION_FAILURE; 440 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION); 441 goto f_err; 442 } 443 } 444 445 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra) 446 { 447 al=SSL_AD_RECORD_OVERFLOW; 448 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); 449 goto f_err; 450 } 451 452 rr->off=0; 453 /* So at this point the following is true 454 * ssl->s3->rrec.type is the type of record 455 * ssl->s3->rrec.length == number of bytes in record 456 * ssl->s3->rrec.off == offset to first valid byte 457 * ssl->s3->rrec.data == where to take bytes from, increment 458 * after use :-). 459 */ 460 461 /* we have pulled in a full packet so zero things */ 462 s->packet_length=0; 463 464 /* just read a 0 length packet */ 465 if (rr->length == 0) goto again; 466 467 return(1); 468 469f_err: 470 ssl3_send_alert(s,SSL3_AL_FATAL,al); 471err: 472 return(ret); 473 } 474 475static int do_uncompress(SSL *ssl) 476 { 477 int i; 478 SSL3_RECORD *rr; 479 480 rr= &(ssl->s3->rrec); 481 i=COMP_expand_block(ssl->expand,rr->comp, 482 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length); 483 if (i < 0) 484 return(0); 485 else 486 rr->length=i; 487 rr->data=rr->comp; 488 489 return(1); 490 } 491 492static int do_compress(SSL *ssl) 493 { 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 return(1); 508 } 509 510/* Call this to write data in records of type 'type' 511 * It will return <= 0 if not all data has been sent or non-blocking IO. 512 */ 513int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) 514 { 515 const unsigned char *buf=buf_; 516 unsigned int tot,n,nw; 517 int i; 518 519 s->rwstate=SSL_NOTHING; 520 tot=s->s3->wnum; 521 s->s3->wnum=0; 522 523 if (SSL_in_init(s) && !s->in_handshake) 524 { 525 i=s->handshake_func(s); 526 if (i < 0) return(i); 527 if (i == 0) 528 { 529 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 530 return -1; 531 } 532 } 533 534 n=(len-tot); 535 for (;;) 536 { 537 if (n > SSL3_RT_MAX_PLAIN_LENGTH) 538 nw=SSL3_RT_MAX_PLAIN_LENGTH; 539 else 540 nw=n; 541 542 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0); 543 if (i <= 0) 544 { 545 s->s3->wnum=tot; 546 return i; 547 } 548 549 if ((i == (int)n) || 550 (type == SSL3_RT_APPLICATION_DATA && 551 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) 552 { 553 /* next chunk of data should get another prepended empty fragment 554 * in ciphersuites with known-IV weakness: */ 555 s->s3->empty_fragment_done = 0; 556 557 return tot+i; 558 } 559 560 n-=i; 561 tot+=i; 562 } 563 } 564 565static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, 566 unsigned int len, int create_empty_fragment) 567 { 568 unsigned char *p,*plen; 569 int i,mac_size,clear=0; 570 int prefix_len = 0; 571 SSL3_RECORD *wr; 572 SSL3_BUFFER *wb; 573 SSL_SESSION *sess; 574 575 /* first check if there is a SSL3_BUFFER still being written 576 * out. This will happen with non blocking IO */ 577 if (s->s3->wbuf.left != 0) 578 return(ssl3_write_pending(s,type,buf,len)); 579 580 /* If we have an alert to send, lets send it */ 581 if (s->s3->alert_dispatch) 582 { 583 i=ssl3_dispatch_alert(s); 584 if (i <= 0) 585 return(i); 586 /* if it went, fall through and send more stuff */ 587 } 588 589 if (len == 0 && !create_empty_fragment) 590 return 0; 591 592 wr= &(s->s3->wrec); 593 wb= &(s->s3->wbuf); 594 sess=s->session; 595 596 if ( (sess == NULL) || 597 (s->enc_write_ctx == NULL) || 598 (s->write_hash == NULL)) 599 clear=1; 600 601 if (clear) 602 mac_size=0; 603 else 604 mac_size=EVP_MD_size(s->write_hash); 605 606 /* 'create_empty_fragment' is true only when this function calls itself */ 607 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) 608 { 609 /* countermeasure against known-IV weakness in CBC ciphersuites 610 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 611 612 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) 613 { 614 /* recursive function call with 'create_empty_fragment' set; 615 * this prepares and buffers the data for an empty fragment 616 * (these 'prefix_len' bytes are sent out later 617 * together with the actual payload) */ 618 prefix_len = do_ssl3_write(s, type, buf, 0, 1); 619 if (prefix_len <= 0) 620 goto err; 621 622 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) 623 { 624 /* insufficient space */ 625 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); 626 goto err; 627 } 628 } 629 630 s->s3->empty_fragment_done = 1; 631 } 632 633 p = wb->buf + prefix_len; 634 635 /* write the header */ 636 637 *(p++)=type&0xff; 638 wr->type=type; 639 640 *(p++)=(s->version>>8); 641 *(p++)=s->version&0xff; 642 643 /* field where we are to write out packet length */ 644 plen=p; 645 p+=2; 646 647 /* lets setup the record stuff. */ 648 wr->data=p; 649 wr->length=(int)len; 650 wr->input=(unsigned char *)buf; 651 652 /* we now 'read' from wr->input, wr->length bytes into 653 * wr->data */ 654 655 /* first we compress */ 656 if (s->compress != NULL) 657 { 658 if (!do_compress(s)) 659 { 660 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE); 661 goto err; 662 } 663 } 664 else 665 { 666 memcpy(wr->data,wr->input,wr->length); 667 wr->input=wr->data; 668 } 669 670 /* we should still have the output to wr->data and the input 671 * from wr->input. Length should be wr->length. 672 * wr->data still points in the wb->buf */ 673 674 if (mac_size != 0) 675 { 676 s->method->ssl3_enc->mac(s,&(p[wr->length]),1); 677 wr->length+=mac_size; 678 wr->input=p; 679 wr->data=p; 680 } 681 682 /* ssl3_enc can only have an error on read */ 683 s->method->ssl3_enc->enc(s,1); 684 685 /* record length after mac and block padding */ 686 s2n(wr->length,plen); 687 688 /* we should now have 689 * wr->data pointing to the encrypted data, which is 690 * wr->length long */ 691 wr->type=type; /* not needed but helps for debugging */ 692 wr->length+=SSL3_RT_HEADER_LENGTH; 693 694 if (create_empty_fragment) 695 { 696 /* we are in a recursive call; 697 * just return the length, don't write out anything here 698 */ 699 return wr->length; 700 } 701 702 /* now let's set up wb */ 703 wb->left = prefix_len + wr->length; 704 wb->offset = 0; 705 706 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ 707 s->s3->wpend_tot=len; 708 s->s3->wpend_buf=buf; 709 s->s3->wpend_type=type; 710 s->s3->wpend_ret=len; 711 712 /* we now just need to write the buffer */ 713 return ssl3_write_pending(s,type,buf,len); 714err: 715 return -1; 716 } 717 718/* if s->s3->wbuf.left != 0, we need to call this */ 719static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, 720 unsigned int len) 721 { 722 int i; 723 724/* XXXX */ 725 if ((s->s3->wpend_tot > (int)len) 726 || ((s->s3->wpend_buf != buf) && 727 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) 728 || (s->s3->wpend_type != type)) 729 { 730 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 731 return(-1); 732 } 733 734 for (;;) 735 { 736 clear_sys_error(); 737 if (s->wbio != NULL) 738 { 739 s->rwstate=SSL_WRITING; 740 i=BIO_write(s->wbio, 741 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]), 742 (unsigned int)s->s3->wbuf.left); 743 } 744 else 745 { 746 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET); 747 i= -1; 748 } 749 if (i == s->s3->wbuf.left) 750 { 751 s->s3->wbuf.left=0; 752 s->rwstate=SSL_NOTHING; 753 return(s->s3->wpend_ret); 754 } 755 else if (i <= 0) 756 return(i); 757 s->s3->wbuf.offset+=i; 758 s->s3->wbuf.left-=i; 759 } 760 } 761 762/* Return up to 'len' payload bytes received in 'type' records. 763 * 'type' is one of the following: 764 * 765 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) 766 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) 767 * - 0 (during a shutdown, no data has to be returned) 768 * 769 * If we don't have stored data to work from, read a SSL/TLS record first 770 * (possibly multiple records if we still don't have anything to return). 771 * 772 * This function must handle any surprises the peer may have for us, such as 773 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really 774 * a surprise, but handled as if it were), or renegotiation requests. 775 * Also if record payloads contain fragments too small to process, we store 776 * them until there is enough for the respective protocol (the record protocol 777 * may use arbitrary fragmentation and even interleaving): 778 * Change cipher spec protocol 779 * just 1 byte needed, no need for keeping anything stored 780 * Alert protocol 781 * 2 bytes needed (AlertLevel, AlertDescription) 782 * Handshake protocol 783 * 4 bytes needed (HandshakeType, uint24 length) -- we just have 784 * to detect unexpected Client Hello and Hello Request messages 785 * here, anything else is handled by higher layers 786 * Application data protocol 787 * none of our business 788 */ 789int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) 790 { 791 int al,i,j,ret; 792 unsigned int n; 793 SSL3_RECORD *rr; 794 void (*cb)(const SSL *ssl,int type2,int val)=NULL; 795 796 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ 797 if (!ssl3_setup_buffers(s)) 798 return(-1); 799 800 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || 801 (peek && (type != SSL3_RT_APPLICATION_DATA))) 802 { 803 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); 804 return -1; 805 } 806 807 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0)) 808 /* (partially) satisfy request from storage */ 809 { 810 unsigned char *src = s->s3->handshake_fragment; 811 unsigned char *dst = buf; 812 unsigned int k; 813 814 /* peek == 0 */ 815 n = 0; 816 while ((len > 0) && (s->s3->handshake_fragment_len > 0)) 817 { 818 *dst++ = *src++; 819 len--; s->s3->handshake_fragment_len--; 820 n++; 821 } 822 /* move any remaining fragment bytes: */ 823 for (k = 0; k < s->s3->handshake_fragment_len; k++) 824 s->s3->handshake_fragment[k] = *src++; 825 return n; 826 } 827 828 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ 829 830 if (!s->in_handshake && SSL_in_init(s)) 831 { 832 /* type == SSL3_RT_APPLICATION_DATA */ 833 i=s->handshake_func(s); 834 if (i < 0) return(i); 835 if (i == 0) 836 { 837 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 838 return(-1); 839 } 840 } 841start: 842 s->rwstate=SSL_NOTHING; 843 844 /* s->s3->rrec.type - is the type of record 845 * s->s3->rrec.data, - data 846 * s->s3->rrec.off, - offset into 'data' for next read 847 * s->s3->rrec.length, - number of bytes. */ 848 rr = &(s->s3->rrec); 849 850 /* get new packet if necessary */ 851 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) 852 { 853 ret=ssl3_get_record(s); 854 if (ret <= 0) return(ret); 855 } 856 857 /* we now have a packet which can be read and processed */ 858 859 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, 860 * reset by ssl3_get_finished */ 861 && (rr->type != SSL3_RT_HANDSHAKE)) 862 { 863 al=SSL_AD_UNEXPECTED_MESSAGE; 864 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); 865 goto f_err; 866 } 867 868 /* If the other end has shut down, throw anything we read away 869 * (even in 'peek' mode) */ 870 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) 871 { 872 rr->length=0; 873 s->rwstate=SSL_NOTHING; 874 return(0); 875 } 876 877 878 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ 879 { 880 /* make sure that we are not getting application data when we 881 * are doing a handshake for the first time */ 882 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && 883 (s->enc_read_ctx == NULL)) 884 { 885 al=SSL_AD_UNEXPECTED_MESSAGE; 886 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); 887 goto f_err; 888 } 889 890 if (len <= 0) return(len); 891 892 if ((unsigned int)len > rr->length) 893 n = rr->length; 894 else 895 n = (unsigned int)len; 896 897 memcpy(buf,&(rr->data[rr->off]),n); 898 if (!peek) 899 { 900 rr->length-=n; 901 rr->off+=n; 902 if (rr->length == 0) 903 { 904 s->rstate=SSL_ST_READ_HEADER; 905 rr->off=0; 906 } 907 } 908 return(n); 909 } 910 911 912 /* If we get here, then type != rr->type; if we have a handshake 913 * message, then it was unexpected (Hello Request or Client Hello). */ 914 915 /* In case of record types for which we have 'fragment' storage, 916 * fill that so that we can process the data at a fixed place. 917 */ 918 { 919 unsigned int dest_maxlen = 0; 920 unsigned char *dest = NULL; 921 unsigned int *dest_len = NULL; 922 923 if (rr->type == SSL3_RT_HANDSHAKE) 924 { 925 dest_maxlen = sizeof s->s3->handshake_fragment; 926 dest = s->s3->handshake_fragment; 927 dest_len = &s->s3->handshake_fragment_len; 928 } 929 else if (rr->type == SSL3_RT_ALERT) 930 { 931 dest_maxlen = sizeof s->s3->alert_fragment; 932 dest = s->s3->alert_fragment; 933 dest_len = &s->s3->alert_fragment_len; 934 } 935 936 if (dest_maxlen > 0) 937 { 938 n = dest_maxlen - *dest_len; /* available space in 'dest' */ 939 if (rr->length < n) 940 n = rr->length; /* available bytes */ 941 942 /* now move 'n' bytes: */ 943 while (n-- > 0) 944 { 945 dest[(*dest_len)++] = rr->data[rr->off++]; 946 rr->length--; 947 } 948 949 if (*dest_len < dest_maxlen) 950 goto start; /* fragment was too small */ 951 } 952 } 953 954 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; 955 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. 956 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ 957 958 /* If we are a client, check for an incoming 'Hello Request': */ 959 if ((!s->server) && 960 (s->s3->handshake_fragment_len >= 4) && 961 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && 962 (s->session != NULL) && (s->session->cipher != NULL)) 963 { 964 s->s3->handshake_fragment_len = 0; 965 966 if ((s->s3->handshake_fragment[1] != 0) || 967 (s->s3->handshake_fragment[2] != 0) || 968 (s->s3->handshake_fragment[3] != 0)) 969 { 970 al=SSL_AD_DECODE_ERROR; 971 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); 972 goto f_err; 973 } 974 975 if (s->msg_callback) 976 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg); 977 978 if (SSL_is_init_finished(s) && 979 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && 980 !s->s3->renegotiate) 981 { 982 ssl3_renegotiate(s); 983 if (ssl3_renegotiate_check(s)) 984 { 985 i=s->handshake_func(s); 986 if (i < 0) return(i); 987 if (i == 0) 988 { 989 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 990 return(-1); 991 } 992 993 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 994 { 995 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 996 { 997 BIO *bio; 998 /* In the case where we try to read application data, 999 * but we trigger an SSL handshake, we return -1 with 1000 * the retry option set. Otherwise renegotiation may 1001 * cause nasty problems in the blocking world */ 1002 s->rwstate=SSL_READING; 1003 bio=SSL_get_rbio(s); 1004 BIO_clear_retry_flags(bio); 1005 BIO_set_retry_read(bio); 1006 return(-1); 1007 } 1008 } 1009 } 1010 } 1011 /* we either finished a handshake or ignored the request, 1012 * now try again to obtain the (application) data we were asked for */ 1013 goto start; 1014 } 1015 1016 if (s->s3->alert_fragment_len >= 2) 1017 { 1018 int alert_level = s->s3->alert_fragment[0]; 1019 int alert_descr = s->s3->alert_fragment[1]; 1020 1021 s->s3->alert_fragment_len = 0; 1022 1023 if (s->msg_callback) 1024 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg); 1025 1026 if (s->info_callback != NULL) 1027 cb=s->info_callback; 1028 else if (s->ctx->info_callback != NULL) 1029 cb=s->ctx->info_callback; 1030 1031 if (cb != NULL) 1032 { 1033 j = (alert_level << 8) | alert_descr; 1034 cb(s, SSL_CB_READ_ALERT, j); 1035 } 1036 1037 if (alert_level == 1) /* warning */ 1038 { 1039 s->s3->warn_alert = alert_descr; 1040 if (alert_descr == SSL_AD_CLOSE_NOTIFY) 1041 { 1042 s->shutdown |= SSL_RECEIVED_SHUTDOWN; 1043 return(0); 1044 } 1045 } 1046 else if (alert_level == 2) /* fatal */ 1047 { 1048 char tmp[16]; 1049 1050 s->rwstate=SSL_NOTHING; 1051 s->s3->fatal_alert = alert_descr; 1052 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); 1053 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); 1054 ERR_add_error_data(2,"SSL alert number ",tmp); 1055 s->shutdown|=SSL_RECEIVED_SHUTDOWN; 1056 SSL_CTX_remove_session(s->ctx,s->session); 1057 return(0); 1058 } 1059 else 1060 { 1061 al=SSL_AD_ILLEGAL_PARAMETER; 1062 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); 1063 goto f_err; 1064 } 1065 1066 goto start; 1067 } 1068 1069 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ 1070 { 1071 s->rwstate=SSL_NOTHING; 1072 rr->length=0; 1073 return(0); 1074 } 1075 1076 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1077 { 1078 /* 'Change Cipher Spec' is just a single byte, so we know 1079 * exactly what the record payload has to look like */ 1080 if ( (rr->length != 1) || (rr->off != 0) || 1081 (rr->data[0] != SSL3_MT_CCS)) 1082 { 1083 al=SSL_AD_ILLEGAL_PARAMETER; 1084 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); 1085 goto f_err; 1086 } 1087 1088 /* Check we have a cipher to change to */ 1089 if (s->s3->tmp.new_cipher == NULL) 1090 { 1091 al=SSL_AD_UNEXPECTED_MESSAGE; 1092 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY); 1093 goto f_err; 1094 } 1095 1096 rr->length=0; 1097 1098 if (s->msg_callback) 1099 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); 1100 1101 s->s3->change_cipher_spec=1; 1102 if (!do_change_cipher_spec(s)) 1103 goto err; 1104 else 1105 goto start; 1106 } 1107 1108 /* Unexpected handshake message (Client Hello, or protocol violation) */ 1109 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) 1110 { 1111 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && 1112 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) 1113 { 1114#if 0 /* worked only because C operator preferences are not as expected (and 1115 * because this is not really needed for clients except for detecting 1116 * protocol violations): */ 1117 s->state=SSL_ST_BEFORE|(s->server) 1118 ?SSL_ST_ACCEPT 1119 :SSL_ST_CONNECT; 1120#else 1121 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; 1122#endif 1123 s->new_session=1; 1124 } 1125 i=s->handshake_func(s); 1126 if (i < 0) return(i); 1127 if (i == 0) 1128 { 1129 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1130 return(-1); 1131 } 1132 1133 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 1134 { 1135 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 1136 { 1137 BIO *bio; 1138 /* In the case where we try to read application data, 1139 * but we trigger an SSL handshake, we return -1 with 1140 * the retry option set. Otherwise renegotiation may 1141 * cause nasty problems in the blocking world */ 1142 s->rwstate=SSL_READING; 1143 bio=SSL_get_rbio(s); 1144 BIO_clear_retry_flags(bio); 1145 BIO_set_retry_read(bio); 1146 return(-1); 1147 } 1148 } 1149 goto start; 1150 } 1151 1152 switch (rr->type) 1153 { 1154 default: 1155#ifndef OPENSSL_NO_TLS 1156 /* TLS just ignores unknown message types */ 1157 if (s->version == TLS1_VERSION) 1158 { 1159 rr->length = 0; 1160 goto start; 1161 } 1162#endif 1163 al=SSL_AD_UNEXPECTED_MESSAGE; 1164 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1165 goto f_err; 1166 case SSL3_RT_CHANGE_CIPHER_SPEC: 1167 case SSL3_RT_ALERT: 1168 case SSL3_RT_HANDSHAKE: 1169 /* we already handled all of these, with the possible exception 1170 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that 1171 * should not happen when type != rr->type */ 1172 al=SSL_AD_UNEXPECTED_MESSAGE; 1173 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR); 1174 goto f_err; 1175 case SSL3_RT_APPLICATION_DATA: 1176 /* At this point, we were expecting handshake data, 1177 * but have application data. If the library was 1178 * running inside ssl3_read() (i.e. in_read_app_data 1179 * is set) and it makes sense to read application data 1180 * at this point (session renegotiation not yet started), 1181 * we will indulge it. 1182 */ 1183 if (s->s3->in_read_app_data && 1184 (s->s3->total_renegotiations != 0) && 1185 (( 1186 (s->state & SSL_ST_CONNECT) && 1187 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && 1188 (s->state <= SSL3_ST_CR_SRVR_HELLO_A) 1189 ) || ( 1190 (s->state & SSL_ST_ACCEPT) && 1191 (s->state <= SSL3_ST_SW_HELLO_REQ_A) && 1192 (s->state >= SSL3_ST_SR_CLNT_HELLO_A) 1193 ) 1194 )) 1195 { 1196 s->s3->in_read_app_data=2; 1197 return(-1); 1198 } 1199 else 1200 { 1201 al=SSL_AD_UNEXPECTED_MESSAGE; 1202 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1203 goto f_err; 1204 } 1205 } 1206 /* not reached */ 1207 1208f_err: 1209 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1210err: 1211 return(-1); 1212 } 1213 1214static int do_change_cipher_spec(SSL *s) 1215 { 1216 int i; 1217 const char *sender; 1218 int slen; 1219 1220 if (s->state & SSL_ST_ACCEPT) 1221 i=SSL3_CHANGE_CIPHER_SERVER_READ; 1222 else 1223 i=SSL3_CHANGE_CIPHER_CLIENT_READ; 1224 1225 if (s->s3->tmp.key_block == NULL) 1226 { 1227 s->session->cipher=s->s3->tmp.new_cipher; 1228 if (!s->method->ssl3_enc->setup_key_block(s)) return(0); 1229 } 1230 1231 if (!s->method->ssl3_enc->change_cipher_state(s,i)) 1232 return(0); 1233 1234 /* we have to record the message digest at 1235 * this point so we can get it before we read 1236 * the finished message */ 1237 if (s->state & SSL_ST_CONNECT) 1238 { 1239 sender=s->method->ssl3_enc->server_finished_label; 1240 slen=s->method->ssl3_enc->server_finished_label_len; 1241 } 1242 else 1243 { 1244 sender=s->method->ssl3_enc->client_finished_label; 1245 slen=s->method->ssl3_enc->client_finished_label_len; 1246 } 1247 1248 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, 1249 &(s->s3->finish_dgst1), 1250 &(s->s3->finish_dgst2), 1251 sender,slen,s->s3->tmp.peer_finish_md); 1252 1253 return(1); 1254 } 1255 1256void ssl3_send_alert(SSL *s, int level, int desc) 1257 { 1258 /* Map tls/ssl alert value to correct one */ 1259 desc=s->method->ssl3_enc->alert_value(desc); 1260 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) 1261 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */ 1262 if (desc < 0) return; 1263 /* If a fatal one, remove from cache */ 1264 if ((level == 2) && (s->session != NULL)) 1265 SSL_CTX_remove_session(s->ctx,s->session); 1266 1267 s->s3->alert_dispatch=1; 1268 s->s3->send_alert[0]=level; 1269 s->s3->send_alert[1]=desc; 1270 if (s->s3->wbuf.left == 0) /* data still being written out? */ 1271 ssl3_dispatch_alert(s); 1272 /* else data is still being written out, we will get written 1273 * some time in the future */ 1274 } 1275 1276int ssl3_dispatch_alert(SSL *s) 1277 { 1278 int i,j; 1279 void (*cb)(const SSL *ssl,int type,int val)=NULL; 1280 1281 s->s3->alert_dispatch=0; 1282 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0); 1283 if (i <= 0) 1284 { 1285 s->s3->alert_dispatch=1; 1286 } 1287 else 1288 { 1289 /* Alert sent to BIO. If it is important, flush it now. 1290 * If the message does not get sent due to non-blocking IO, 1291 * we will not worry too much. */ 1292 if (s->s3->send_alert[0] == SSL3_AL_FATAL) 1293 (void)BIO_flush(s->wbio); 1294 1295 if (s->msg_callback) 1296 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); 1297 1298 if (s->info_callback != NULL) 1299 cb=s->info_callback; 1300 else if (s->ctx->info_callback != NULL) 1301 cb=s->ctx->info_callback; 1302 1303 if (cb != NULL) 1304 { 1305 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; 1306 cb(s,SSL_CB_WRITE_ALERT,j); 1307 } 1308 } 1309 return(i); 1310 } 1311