s2_pkt.c revision 312826
1/* ssl/s2_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) 1998-2001 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 "ssl_locl.h" 113#ifndef OPENSSL_NO_SSL2 114# include <stdio.h> 115# include <errno.h> 116# define USE_SOCKETS 117 118static int read_n(SSL *s, unsigned int n, unsigned int max, 119 unsigned int extend); 120static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); 121static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); 122static int ssl_mt_error(int n); 123 124/* 125 * SSL 2.0 imlementation for SSL_read/SSL_peek - This routine will return 0 126 * to len bytes, decrypted etc if required. 127 */ 128static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) 129{ 130 int n; 131 unsigned char mac[MAX_MAC_SIZE]; 132 unsigned char *p; 133 int i; 134 int mac_size; 135 136 ssl2_read_again: 137 if (SSL_in_init(s) && !s->in_handshake) { 138 n = s->handshake_func(s); 139 if (n < 0) 140 return (n); 141 if (n == 0) { 142 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_SSL_HANDSHAKE_FAILURE); 143 return (-1); 144 } 145 } 146 147 clear_sys_error(); 148 s->rwstate = SSL_NOTHING; 149 if (len <= 0) 150 return (len); 151 152 if (s->s2->ract_data_length != 0) { /* read from buffer */ 153 if (len > s->s2->ract_data_length) 154 n = s->s2->ract_data_length; 155 else 156 n = len; 157 158 memcpy(buf, s->s2->ract_data, (unsigned int)n); 159 if (!peek) { 160 s->s2->ract_data_length -= n; 161 s->s2->ract_data += n; 162 if (s->s2->ract_data_length == 0) 163 s->rstate = SSL_ST_READ_HEADER; 164 } 165 166 return (n); 167 } 168 169 /* 170 * s->s2->ract_data_length == 0 Fill the buffer, then goto 171 * ssl2_read_again. 172 */ 173 174 if (s->rstate == SSL_ST_READ_HEADER) { 175 if (s->first_packet) { 176 n = read_n(s, 5, SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2, 0); 177 if (n <= 0) 178 return (n); /* error or non-blocking */ 179 s->first_packet = 0; 180 p = s->packet; 181 if (!((p[0] & 0x80) && ((p[2] == SSL2_MT_CLIENT_HELLO) || 182 (p[2] == SSL2_MT_SERVER_HELLO)))) { 183 SSLerr(SSL_F_SSL2_READ_INTERNAL, 184 SSL_R_NON_SSLV2_INITIAL_PACKET); 185 return (-1); 186 } 187 } else { 188 n = read_n(s, 2, SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2, 0); 189 if (n <= 0) 190 return (n); /* error or non-blocking */ 191 } 192 /* part read stuff */ 193 194 s->rstate = SSL_ST_READ_BODY; 195 p = s->packet; 196 /* Do header */ 197 /* 198 * s->s2->padding=0; 199 */ 200 s->s2->escape = 0; 201 s->s2->rlength = (((unsigned int)p[0]) << 8) | ((unsigned int)p[1]); 202 if ((p[0] & TWO_BYTE_BIT)) { /* Two byte header? */ 203 s->s2->three_byte_header = 0; 204 s->s2->rlength &= TWO_BYTE_MASK; 205 } else { 206 s->s2->three_byte_header = 1; 207 s->s2->rlength &= THREE_BYTE_MASK; 208 209 /* security >s2->escape */ 210 s->s2->escape = ((p[0] & SEC_ESC_BIT)) ? 1 : 0; 211 } 212 } 213 214 if (s->rstate == SSL_ST_READ_BODY) { 215 n = s->s2->rlength + 2 + s->s2->three_byte_header; 216 if (n > (int)s->packet_length) { 217 n -= s->packet_length; 218 i = read_n(s, (unsigned int)n, (unsigned int)n, 1); 219 if (i <= 0) 220 return (i); /* ERROR */ 221 } 222 223 p = &(s->packet[2]); 224 s->rstate = SSL_ST_READ_HEADER; 225 if (s->s2->three_byte_header) 226 s->s2->padding = *(p++); 227 else 228 s->s2->padding = 0; 229 230 /* Data portion */ 231 if (s->s2->clear_text) { 232 mac_size = 0; 233 s->s2->mac_data = p; 234 s->s2->ract_data = p; 235 if (s->s2->padding) { 236 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_ILLEGAL_PADDING); 237 return (-1); 238 } 239 } else { 240 mac_size = EVP_MD_CTX_size(s->read_hash); 241 if (mac_size < 0) 242 return -1; 243 OPENSSL_assert(mac_size <= MAX_MAC_SIZE); 244 s->s2->mac_data = p; 245 s->s2->ract_data = &p[mac_size]; 246 if (s->s2->padding + mac_size > s->s2->rlength) { 247 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_ILLEGAL_PADDING); 248 return (-1); 249 } 250 } 251 252 s->s2->ract_data_length = s->s2->rlength; 253 /* 254 * added a check for length > max_size in case encryption was not 255 * turned on yet due to an error 256 */ 257 if ((!s->s2->clear_text) && 258 (s->s2->rlength >= (unsigned int)mac_size)) { 259 if (!ssl2_enc(s, 0)) { 260 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_DECRYPTION_FAILED); 261 return (-1); 262 } 263 s->s2->ract_data_length -= mac_size; 264 ssl2_mac(s, mac, 0); 265 s->s2->ract_data_length -= s->s2->padding; 266 if ((CRYPTO_memcmp(mac, s->s2->mac_data, mac_size) != 0) || 267 (s->s2->rlength % 268 EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) { 269 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_BAD_MAC_DECODE); 270 return (-1); 271 } 272 } 273 INC32(s->s2->read_sequence); /* expect next number */ 274 /* s->s2->ract_data is now available for processing */ 275 276 /* 277 * Possibly the packet that we just read had 0 actual data bytes. 278 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 279 * In this case, returning 0 would be interpreted by the caller as 280 * indicating EOF, so it's not a good idea. Instead, we just 281 * continue reading; thus ssl2_read_internal may have to process 282 * multiple packets before it can return. [Note that using select() 283 * for blocking sockets *never* guarantees that the next SSL_read 284 * will not block -- the available data may contain incomplete 285 * packets, and except for SSL 2, renegotiation can confuse things 286 * even more.] 287 */ 288 289 goto ssl2_read_again; /* This should really be "return 290 * ssl2_read(s,buf,len)", but that would 291 * allow for denial-of-service attacks if a C 292 * compiler is used that does not recognize 293 * end-recursion. */ 294 } else { 295 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_BAD_STATE); 296 return (-1); 297 } 298} 299 300int ssl2_read(SSL *s, void *buf, int len) 301{ 302 return ssl2_read_internal(s, buf, len, 0); 303} 304 305int ssl2_peek(SSL *s, void *buf, int len) 306{ 307 return ssl2_read_internal(s, buf, len, 1); 308} 309 310/* 311 * Return values are as per SSL_read() 312 */ 313static int read_n(SSL *s, unsigned int n, unsigned int max, 314 unsigned int extend) 315{ 316 int i, off, newb; 317 318 /* 319 * if there is stuff still in the buffer from a previous read, and there 320 * is more than we want, take some. 321 */ 322 if (s->s2->rbuf_left >= (int)n) { 323 if (extend) 324 s->packet_length += n; 325 else { 326 s->packet = &(s->s2->rbuf[s->s2->rbuf_offs]); 327 s->packet_length = n; 328 } 329 s->s2->rbuf_left -= n; 330 s->s2->rbuf_offs += n; 331 return (n); 332 } 333 334 if (!s->read_ahead) 335 max = n; 336 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) 337 max = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2; 338 339 /* 340 * Else we want more than we have. First, if there is some left or we 341 * want to extend 342 */ 343 off = 0; 344 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) { 345 newb = s->s2->rbuf_left; 346 if (extend) { 347 off = s->packet_length; 348 if (s->packet != s->s2->rbuf) 349 memcpy(s->s2->rbuf, s->packet, (unsigned int)newb + off); 350 } else if (s->s2->rbuf_offs != 0) { 351 memcpy(s->s2->rbuf, &(s->s2->rbuf[s->s2->rbuf_offs]), 352 (unsigned int)newb); 353 s->s2->rbuf_offs = 0; 354 } 355 s->s2->rbuf_left = 0; 356 } else 357 newb = 0; 358 359 /* 360 * off is the offset to start writing too. r->s2->rbuf_offs is the 361 * 'unread data', now 0. newb is the number of new bytes so far 362 */ 363 s->packet = s->s2->rbuf; 364 while (newb < (int)n) { 365 clear_sys_error(); 366 if (s->rbio != NULL) { 367 s->rwstate = SSL_READING; 368 i = BIO_read(s->rbio, (char *)&(s->s2->rbuf[off + newb]), 369 max - newb); 370 } else { 371 SSLerr(SSL_F_READ_N, SSL_R_READ_BIO_NOT_SET); 372 i = -1; 373 } 374# ifdef PKT_DEBUG 375 if (s->debug & 0x01) 376 sleep(1); 377# endif 378 if (i <= 0) { 379 s->s2->rbuf_left += newb; 380 return i; 381 } 382 newb += i; 383 } 384 385 /* record unread data */ 386 if (newb > (int)n) { 387 s->s2->rbuf_offs = n + off; 388 s->s2->rbuf_left = newb - n; 389 } else { 390 s->s2->rbuf_offs = 0; 391 s->s2->rbuf_left = 0; 392 } 393 if (extend) 394 s->packet_length += n; 395 else 396 s->packet_length = n; 397 s->rwstate = SSL_NOTHING; 398 return (n); 399} 400 401int ssl2_write(SSL *s, const void *_buf, int len) 402{ 403 const unsigned char *buf = _buf; 404 unsigned int n, tot; 405 int i; 406 407 if (SSL_in_init(s) && !s->in_handshake) { 408 i = s->handshake_func(s); 409 if (i < 0) 410 return (i); 411 if (i == 0) { 412 SSLerr(SSL_F_SSL2_WRITE, SSL_R_SSL_HANDSHAKE_FAILURE); 413 return (-1); 414 } 415 } 416 417 if (s->error) { 418 ssl2_write_error(s); 419 if (s->error) 420 return (-1); 421 } 422 423 clear_sys_error(); 424 s->rwstate = SSL_NOTHING; 425 if (len <= 0) 426 return (len); 427 428 tot = s->s2->wnum; 429 s->s2->wnum = 0; 430 431 n = (len - tot); 432 for (;;) { 433 i = n_do_ssl_write(s, &(buf[tot]), n); 434 if (i <= 0) { 435 s->s2->wnum = tot; 436 return (i); 437 } 438 if ((i == (int)n) || (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) { 439 return (tot + i); 440 } 441 442 n -= i; 443 tot += i; 444 } 445} 446 447/* 448 * Return values are as per SSL_write() 449 */ 450static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 451{ 452 int i; 453 454 /* s->s2->wpend_len != 0 MUST be true. */ 455 456 /* 457 * check that they have given us the same buffer to write 458 */ 459 if ((s->s2->wpend_tot > (int)len) || 460 ((s->s2->wpend_buf != buf) && 461 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) { 462 SSLerr(SSL_F_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY); 463 return (-1); 464 } 465 466 for (;;) { 467 clear_sys_error(); 468 if (s->wbio != NULL) { 469 s->rwstate = SSL_WRITING; 470 i = BIO_write(s->wbio, 471 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 472 (unsigned int)s->s2->wpend_len); 473 } else { 474 SSLerr(SSL_F_WRITE_PENDING, SSL_R_WRITE_BIO_NOT_SET); 475 i = -1; 476 } 477# ifdef PKT_DEBUG 478 if (s->debug & 0x01) 479 sleep(1); 480# endif 481 if (i == s->s2->wpend_len) { 482 s->s2->wpend_len = 0; 483 s->rwstate = SSL_NOTHING; 484 return (s->s2->wpend_ret); 485 } else if (i <= 0) 486 return i; 487 s->s2->wpend_off += i; 488 s->s2->wpend_len -= i; 489 } 490} 491 492static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 493{ 494 unsigned int j, k, olen, p, bs; 495 int mac_size; 496 register unsigned char *pp; 497 498 olen = len; 499 500 /* 501 * first check if there is data from an encryption waiting to be sent - 502 * it must be sent because the other end is waiting. This will happen 503 * with non-blocking IO. We print it and then return. 504 */ 505 if (s->s2->wpend_len != 0) 506 return (write_pending(s, buf, len)); 507 508 /* set mac_size to mac size */ 509 if (s->s2->clear_text) 510 mac_size = 0; 511 else { 512 mac_size = EVP_MD_CTX_size(s->write_hash); 513 if (mac_size < 0) 514 return -1; 515 } 516 517 /* lets set the pad p */ 518 if (s->s2->clear_text) { 519 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 520 len = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 521 p = 0; 522 s->s2->three_byte_header = 0; 523 /* len=len; */ 524 } else { 525 bs = EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 526 j = len + mac_size; 527 /* 528 * Two-byte headers allow for a larger record length than three-byte 529 * headers, but we can't use them if we need padding or if we have to 530 * set the escape bit. 531 */ 532 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && (!s->s2->escape)) { 533 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 534 j = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 535 /* 536 * set k to the max number of bytes with 2 byte header 537 */ 538 k = j - (j % bs); 539 /* how many data bytes? */ 540 len = k - mac_size; 541 s->s2->three_byte_header = 0; 542 p = 0; 543 } else if ((bs <= 1) && (!s->s2->escape)) { 544 /*- 545 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 546 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 547 */ 548 s->s2->three_byte_header = 0; 549 p = 0; 550 } else { /* we may have to use a 3 byte header */ 551 552 /*- 553 * If s->s2->escape is not set, then 554 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 555 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. 556 */ 557 p = (j % bs); 558 p = (p == 0) ? 0 : (bs - p); 559 if (s->s2->escape) { 560 s->s2->three_byte_header = 1; 561 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 562 j = SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 563 } else 564 s->s2->three_byte_header = (p == 0) ? 0 : 1; 565 } 566 } 567 568 /*- 569 * Now 570 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 571 * holds, and if s->s2->three_byte_header is set, then even 572 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 573 */ 574 575 /* 576 * mac_size is the number of MAC bytes len is the number of data bytes we 577 * are going to send p is the number of padding bytes (if it is a 578 * two-byte header, then p == 0) 579 */ 580 581 s->s2->wlength = len; 582 s->s2->padding = p; 583 s->s2->mac_data = &(s->s2->wbuf[3]); 584 s->s2->wact_data = &(s->s2->wbuf[3 + mac_size]); 585 586 /* 587 * It would be clearer to write this as follows: 588 * if (mac_size + len + p > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 589 * However |len| is user input that could in theory be very large. We 590 * know |mac_size| and |p| are small, so to avoid any possibility of 591 * overflow we write it like this. 592 * 593 * In theory this should never fail because the logic above should have 594 * modified |len| if it is too big. But we are being cautious. 595 */ 596 if (len > (SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER - (mac_size + p))) { 597 return -1; 598 } 599 /* we copy the data into s->s2->wbuf */ 600 memcpy(s->s2->wact_data, buf, len); 601 if (p) 602 memset(&(s->s2->wact_data[len]), 0, p); /* arbitrary padding */ 603 604 if (!s->s2->clear_text) { 605 s->s2->wact_data_length = len + p; 606 ssl2_mac(s, s->s2->mac_data, 1); 607 s->s2->wlength += p + mac_size; 608 if (ssl2_enc(s, 1) < 1) 609 return -1; 610 } 611 612 /* package up the header */ 613 s->s2->wpend_len = s->s2->wlength; 614 if (s->s2->three_byte_header) { /* 3 byte header */ 615 pp = s->s2->mac_data; 616 pp -= 3; 617 pp[0] = (s->s2->wlength >> 8) & (THREE_BYTE_MASK >> 8); 618 if (s->s2->escape) 619 pp[0] |= SEC_ESC_BIT; 620 pp[1] = s->s2->wlength & 0xff; 621 pp[2] = s->s2->padding; 622 s->s2->wpend_len += 3; 623 } else { 624 pp = s->s2->mac_data; 625 pp -= 2; 626 pp[0] = ((s->s2->wlength >> 8) & (TWO_BYTE_MASK >> 8)) | TWO_BYTE_BIT; 627 pp[1] = s->s2->wlength & 0xff; 628 s->s2->wpend_len += 2; 629 } 630 s->s2->write_ptr = pp; 631 632 INC32(s->s2->write_sequence); /* expect next number */ 633 634 /* lets try to actually write the data */ 635 s->s2->wpend_tot = olen; 636 s->s2->wpend_buf = buf; 637 638 s->s2->wpend_ret = len; 639 640 s->s2->wpend_off = 0; 641 return (write_pending(s, buf, olen)); 642} 643 644int ssl2_part_read(SSL *s, unsigned long f, int i) 645{ 646 unsigned char *p; 647 int j; 648 649 if (i < 0) { 650 /* ssl2_return_error(s); */ 651 /* 652 * for non-blocking io, this is not necessarily fatal 653 */ 654 return (i); 655 } else { 656 s->init_num += i; 657 658 /* 659 * Check for error. While there are recoverable errors, this 660 * function is not called when those must be expected; any error 661 * detected here is fatal. 662 */ 663 if (s->init_num >= 3) { 664 p = (unsigned char *)s->init_buf->data; 665 if (p[0] == SSL2_MT_ERROR) { 666 j = (p[1] << 8) | p[2]; 667 SSLerr((int)f, ssl_mt_error(j)); 668 s->init_num -= 3; 669 if (s->init_num > 0) 670 memmove(p, p + 3, s->init_num); 671 } 672 } 673 674 /* 675 * If it's not an error message, we have some error anyway -- the 676 * message was shorter than expected. This too is treated as fatal 677 * (at least if SSL_get_error is asked for its opinion). 678 */ 679 return (0); 680 } 681} 682 683int ssl2_do_write(SSL *s) 684{ 685 int ret; 686 687 ret = ssl2_write(s, &s->init_buf->data[s->init_off], s->init_num); 688 if (ret == s->init_num) { 689 if (s->msg_callback) 690 s->msg_callback(1, s->version, 0, s->init_buf->data, 691 (size_t)(s->init_off + s->init_num), s, 692 s->msg_callback_arg); 693 return (1); 694 } 695 if (ret < 0) 696 return (-1); 697 s->init_off += ret; 698 s->init_num -= ret; 699 return (0); 700} 701 702static int ssl_mt_error(int n) 703{ 704 int ret; 705 706 switch (n) { 707 case SSL2_PE_NO_CIPHER: 708 ret = SSL_R_PEER_ERROR_NO_CIPHER; 709 break; 710 case SSL2_PE_NO_CERTIFICATE: 711 ret = SSL_R_PEER_ERROR_NO_CERTIFICATE; 712 break; 713 case SSL2_PE_BAD_CERTIFICATE: 714 ret = SSL_R_PEER_ERROR_CERTIFICATE; 715 break; 716 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 717 ret = SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 718 break; 719 default: 720 ret = SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 721 break; 722 } 723 return (ret); 724} 725#else /* !OPENSSL_NO_SSL2 */ 726 727# if PEDANTIC 728static void *dummy = &dummy; 729# endif 730 731#endif 732