s2_pkt.c revision 296341
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 310static int read_n(SSL *s, unsigned int n, unsigned int max, 311 unsigned int extend) 312{ 313 int i, off, newb; 314 315 /* 316 * if there is stuff still in the buffer from a previous read, and there 317 * is more than we want, take some. 318 */ 319 if (s->s2->rbuf_left >= (int)n) { 320 if (extend) 321 s->packet_length += n; 322 else { 323 s->packet = &(s->s2->rbuf[s->s2->rbuf_offs]); 324 s->packet_length = n; 325 } 326 s->s2->rbuf_left -= n; 327 s->s2->rbuf_offs += n; 328 return (n); 329 } 330 331 if (!s->read_ahead) 332 max = n; 333 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) 334 max = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2; 335 336 /* 337 * Else we want more than we have. First, if there is some left or we 338 * want to extend 339 */ 340 off = 0; 341 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) { 342 newb = s->s2->rbuf_left; 343 if (extend) { 344 off = s->packet_length; 345 if (s->packet != s->s2->rbuf) 346 memcpy(s->s2->rbuf, s->packet, (unsigned int)newb + off); 347 } else if (s->s2->rbuf_offs != 0) { 348 memcpy(s->s2->rbuf, &(s->s2->rbuf[s->s2->rbuf_offs]), 349 (unsigned int)newb); 350 s->s2->rbuf_offs = 0; 351 } 352 s->s2->rbuf_left = 0; 353 } else 354 newb = 0; 355 356 /* 357 * off is the offset to start writing too. r->s2->rbuf_offs is the 358 * 'unread data', now 0. newb is the number of new bytes so far 359 */ 360 s->packet = s->s2->rbuf; 361 while (newb < (int)n) { 362 clear_sys_error(); 363 if (s->rbio != NULL) { 364 s->rwstate = SSL_READING; 365 i = BIO_read(s->rbio, (char *)&(s->s2->rbuf[off + newb]), 366 max - newb); 367 } else { 368 SSLerr(SSL_F_READ_N, SSL_R_READ_BIO_NOT_SET); 369 i = -1; 370 } 371# ifdef PKT_DEBUG 372 if (s->debug & 0x01) 373 sleep(1); 374# endif 375 if (i <= 0) { 376 s->s2->rbuf_left += newb; 377 return (i); 378 } 379 newb += i; 380 } 381 382 /* record unread data */ 383 if (newb > (int)n) { 384 s->s2->rbuf_offs = n + off; 385 s->s2->rbuf_left = newb - n; 386 } else { 387 s->s2->rbuf_offs = 0; 388 s->s2->rbuf_left = 0; 389 } 390 if (extend) 391 s->packet_length += n; 392 else 393 s->packet_length = n; 394 s->rwstate = SSL_NOTHING; 395 return (n); 396} 397 398int ssl2_write(SSL *s, const void *_buf, int len) 399{ 400 const unsigned char *buf = _buf; 401 unsigned int n, tot; 402 int i; 403 404 if (SSL_in_init(s) && !s->in_handshake) { 405 i = s->handshake_func(s); 406 if (i < 0) 407 return (i); 408 if (i == 0) { 409 SSLerr(SSL_F_SSL2_WRITE, SSL_R_SSL_HANDSHAKE_FAILURE); 410 return (-1); 411 } 412 } 413 414 if (s->error) { 415 ssl2_write_error(s); 416 if (s->error) 417 return (-1); 418 } 419 420 clear_sys_error(); 421 s->rwstate = SSL_NOTHING; 422 if (len <= 0) 423 return (len); 424 425 tot = s->s2->wnum; 426 s->s2->wnum = 0; 427 428 n = (len - tot); 429 for (;;) { 430 i = n_do_ssl_write(s, &(buf[tot]), n); 431 if (i <= 0) { 432 s->s2->wnum = tot; 433 return (i); 434 } 435 if ((i == (int)n) || (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) { 436 return (tot + i); 437 } 438 439 n -= i; 440 tot += i; 441 } 442} 443 444static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 445{ 446 int i; 447 448 /* s->s2->wpend_len != 0 MUST be true. */ 449 450 /* 451 * check that they have given us the same buffer to write 452 */ 453 if ((s->s2->wpend_tot > (int)len) || 454 ((s->s2->wpend_buf != buf) && 455 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) { 456 SSLerr(SSL_F_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY); 457 return (-1); 458 } 459 460 for (;;) { 461 clear_sys_error(); 462 if (s->wbio != NULL) { 463 s->rwstate = SSL_WRITING; 464 i = BIO_write(s->wbio, 465 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 466 (unsigned int)s->s2->wpend_len); 467 } else { 468 SSLerr(SSL_F_WRITE_PENDING, SSL_R_WRITE_BIO_NOT_SET); 469 i = -1; 470 } 471# ifdef PKT_DEBUG 472 if (s->debug & 0x01) 473 sleep(1); 474# endif 475 if (i == s->s2->wpend_len) { 476 s->s2->wpend_len = 0; 477 s->rwstate = SSL_NOTHING; 478 return (s->s2->wpend_ret); 479 } else if (i <= 0) 480 return (i); 481 s->s2->wpend_off += i; 482 s->s2->wpend_len -= i; 483 } 484} 485 486static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 487{ 488 unsigned int j, k, olen, p, bs; 489 int mac_size; 490 register unsigned char *pp; 491 492 olen = len; 493 494 /* 495 * first check if there is data from an encryption waiting to be sent - 496 * it must be sent because the other end is waiting. This will happen 497 * with non-blocking IO. We print it and then return. 498 */ 499 if (s->s2->wpend_len != 0) 500 return (write_pending(s, buf, len)); 501 502 /* set mac_size to mac size */ 503 if (s->s2->clear_text) 504 mac_size = 0; 505 else { 506 mac_size = EVP_MD_CTX_size(s->write_hash); 507 if (mac_size < 0) 508 return -1; 509 } 510 511 /* lets set the pad p */ 512 if (s->s2->clear_text) { 513 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 514 len = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 515 p = 0; 516 s->s2->three_byte_header = 0; 517 /* len=len; */ 518 } else { 519 bs = EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 520 j = len + mac_size; 521 /* 522 * Two-byte headers allow for a larger record length than three-byte 523 * headers, but we can't use them if we need padding or if we have to 524 * set the escape bit. 525 */ 526 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && (!s->s2->escape)) { 527 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 528 j = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 529 /* 530 * set k to the max number of bytes with 2 byte header 531 */ 532 k = j - (j % bs); 533 /* how many data bytes? */ 534 len = k - mac_size; 535 s->s2->three_byte_header = 0; 536 p = 0; 537 } else if ((bs <= 1) && (!s->s2->escape)) { 538 /*- 539 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 540 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 541 */ 542 s->s2->three_byte_header = 0; 543 p = 0; 544 } else { /* we may have to use a 3 byte header */ 545 546 /*- 547 * If s->s2->escape is not set, then 548 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 549 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. 550 */ 551 p = (j % bs); 552 p = (p == 0) ? 0 : (bs - p); 553 if (s->s2->escape) { 554 s->s2->three_byte_header = 1; 555 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 556 j = SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 557 } else 558 s->s2->three_byte_header = (p == 0) ? 0 : 1; 559 } 560 } 561 562 /*- 563 * Now 564 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 565 * holds, and if s->s2->three_byte_header is set, then even 566 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 567 */ 568 569 /* 570 * mac_size is the number of MAC bytes len is the number of data bytes we 571 * are going to send p is the number of padding bytes (if it is a 572 * two-byte header, then p == 0) 573 */ 574 575 s->s2->wlength = len; 576 s->s2->padding = p; 577 s->s2->mac_data = &(s->s2->wbuf[3]); 578 s->s2->wact_data = &(s->s2->wbuf[3 + mac_size]); 579 580 /* 581 * It would be clearer to write this as follows: 582 * if (mac_size + len + p > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 583 * However |len| is user input that could in theory be very large. We 584 * know |mac_size| and |p| are small, so to avoid any possibility of 585 * overflow we write it like this. 586 * 587 * In theory this should never fail because the logic above should have 588 * modified |len| if it is too big. But we are being cautious. 589 */ 590 if (len > (SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER - (mac_size + p))) { 591 return -1; 592 } 593 /* we copy the data into s->s2->wbuf */ 594 memcpy(s->s2->wact_data, buf, len); 595 if (p) 596 memset(&(s->s2->wact_data[len]), 0, p); /* arbitrary padding */ 597 598 if (!s->s2->clear_text) { 599 s->s2->wact_data_length = len + p; 600 ssl2_mac(s, s->s2->mac_data, 1); 601 s->s2->wlength += p + mac_size; 602 if (ssl2_enc(s, 1) < 1) 603 return -1; 604 } 605 606 /* package up the header */ 607 s->s2->wpend_len = s->s2->wlength; 608 if (s->s2->three_byte_header) { /* 3 byte header */ 609 pp = s->s2->mac_data; 610 pp -= 3; 611 pp[0] = (s->s2->wlength >> 8) & (THREE_BYTE_MASK >> 8); 612 if (s->s2->escape) 613 pp[0] |= SEC_ESC_BIT; 614 pp[1] = s->s2->wlength & 0xff; 615 pp[2] = s->s2->padding; 616 s->s2->wpend_len += 3; 617 } else { 618 pp = s->s2->mac_data; 619 pp -= 2; 620 pp[0] = ((s->s2->wlength >> 8) & (TWO_BYTE_MASK >> 8)) | TWO_BYTE_BIT; 621 pp[1] = s->s2->wlength & 0xff; 622 s->s2->wpend_len += 2; 623 } 624 s->s2->write_ptr = pp; 625 626 INC32(s->s2->write_sequence); /* expect next number */ 627 628 /* lets try to actually write the data */ 629 s->s2->wpend_tot = olen; 630 s->s2->wpend_buf = buf; 631 632 s->s2->wpend_ret = len; 633 634 s->s2->wpend_off = 0; 635 return (write_pending(s, buf, olen)); 636} 637 638int ssl2_part_read(SSL *s, unsigned long f, int i) 639{ 640 unsigned char *p; 641 int j; 642 643 if (i < 0) { 644 /* ssl2_return_error(s); */ 645 /* 646 * for non-blocking io, this is not necessarily fatal 647 */ 648 return (i); 649 } else { 650 s->init_num += i; 651 652 /* 653 * Check for error. While there are recoverable errors, this 654 * function is not called when those must be expected; any error 655 * detected here is fatal. 656 */ 657 if (s->init_num >= 3) { 658 p = (unsigned char *)s->init_buf->data; 659 if (p[0] == SSL2_MT_ERROR) { 660 j = (p[1] << 8) | p[2]; 661 SSLerr((int)f, ssl_mt_error(j)); 662 s->init_num -= 3; 663 if (s->init_num > 0) 664 memmove(p, p + 3, s->init_num); 665 } 666 } 667 668 /* 669 * If it's not an error message, we have some error anyway -- the 670 * message was shorter than expected. This too is treated as fatal 671 * (at least if SSL_get_error is asked for its opinion). 672 */ 673 return (0); 674 } 675} 676 677int ssl2_do_write(SSL *s) 678{ 679 int ret; 680 681 ret = ssl2_write(s, &s->init_buf->data[s->init_off], s->init_num); 682 if (ret == s->init_num) { 683 if (s->msg_callback) 684 s->msg_callback(1, s->version, 0, s->init_buf->data, 685 (size_t)(s->init_off + s->init_num), s, 686 s->msg_callback_arg); 687 return (1); 688 } 689 if (ret < 0) 690 return (-1); 691 s->init_off += ret; 692 s->init_num -= ret; 693 return (0); 694} 695 696static int ssl_mt_error(int n) 697{ 698 int ret; 699 700 switch (n) { 701 case SSL2_PE_NO_CIPHER: 702 ret = SSL_R_PEER_ERROR_NO_CIPHER; 703 break; 704 case SSL2_PE_NO_CERTIFICATE: 705 ret = SSL_R_PEER_ERROR_NO_CERTIFICATE; 706 break; 707 case SSL2_PE_BAD_CERTIFICATE: 708 ret = SSL_R_PEER_ERROR_CERTIFICATE; 709 break; 710 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 711 ret = SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 712 break; 713 default: 714 ret = SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 715 break; 716 } 717 return (ret); 718} 719#else /* !OPENSSL_NO_SSL2 */ 720 721# if PEDANTIC 722static void *dummy = &dummy; 723# endif 724 725#endif 726