s2_pkt.c revision 296465
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 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 unsigned 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_size(s->read_hash); 241 OPENSSL_assert(mac_size <= MAX_MAC_SIZE); 242 s->s2->mac_data = p; 243 s->s2->ract_data = &p[mac_size]; 244 if (s->s2->padding + mac_size > s->s2->rlength) { 245 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_ILLEGAL_PADDING); 246 return (-1); 247 } 248 } 249 250 s->s2->ract_data_length = s->s2->rlength; 251 /* 252 * added a check for length > max_size in case encryption was not 253 * turned on yet due to an error 254 */ 255 if ((!s->s2->clear_text) && (s->s2->rlength >= mac_size)) { 256 ssl2_enc(s, 0); 257 s->s2->ract_data_length -= mac_size; 258 ssl2_mac(s, mac, 0); 259 s->s2->ract_data_length -= s->s2->padding; 260 if ((CRYPTO_memcmp(mac, s->s2->mac_data, mac_size) != 0) || 261 (s->s2->rlength % 262 EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) { 263 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_BAD_MAC_DECODE); 264 return (-1); 265 } 266 } 267 INC32(s->s2->read_sequence); /* expect next number */ 268 /* s->s2->ract_data is now available for processing */ 269 270 /* 271 * Possibly the packet that we just read had 0 actual data bytes. 272 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 273 * In this case, returning 0 would be interpreted by the caller as 274 * indicating EOF, so it's not a good idea. Instead, we just 275 * continue reading; thus ssl2_read_internal may have to process 276 * multiple packets before it can return. [Note that using select() 277 * for blocking sockets *never* guarantees that the next SSL_read 278 * will not block -- the available data may contain incomplete 279 * packets, and except for SSL 2, renegotiation can confuse things 280 * even more.] 281 */ 282 283 goto ssl2_read_again; /* This should really be "return 284 * ssl2_read(s,buf,len)", but that would 285 * allow for denial-of-service attacks if a C 286 * compiler is used that does not recognize 287 * end-recursion. */ 288 } else { 289 SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_BAD_STATE); 290 return (-1); 291 } 292} 293 294int ssl2_read(SSL *s, void *buf, int len) 295{ 296 return ssl2_read_internal(s, buf, len, 0); 297} 298 299int ssl2_peek(SSL *s, void *buf, int len) 300{ 301 return ssl2_read_internal(s, buf, len, 1); 302} 303 304static int read_n(SSL *s, unsigned int n, unsigned int max, 305 unsigned int extend) 306{ 307 int i, off, newb; 308 309 /* 310 * if there is stuff still in the buffer from a previous read, and there 311 * is more than we want, take some. 312 */ 313 if (s->s2->rbuf_left >= (int)n) { 314 if (extend) 315 s->packet_length += n; 316 else { 317 s->packet = &(s->s2->rbuf[s->s2->rbuf_offs]); 318 s->packet_length = n; 319 } 320 s->s2->rbuf_left -= n; 321 s->s2->rbuf_offs += n; 322 return (n); 323 } 324 325 if (!s->read_ahead) 326 max = n; 327 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) 328 max = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2; 329 330 /* 331 * Else we want more than we have. First, if there is some left or we 332 * want to extend 333 */ 334 off = 0; 335 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) { 336 newb = s->s2->rbuf_left; 337 if (extend) { 338 off = s->packet_length; 339 if (s->packet != s->s2->rbuf) 340 memcpy(s->s2->rbuf, s->packet, (unsigned int)newb + off); 341 } else if (s->s2->rbuf_offs != 0) { 342 memcpy(s->s2->rbuf, &(s->s2->rbuf[s->s2->rbuf_offs]), 343 (unsigned int)newb); 344 s->s2->rbuf_offs = 0; 345 } 346 s->s2->rbuf_left = 0; 347 } else 348 newb = 0; 349 350 /* 351 * off is the offset to start writing too. r->s2->rbuf_offs is the 352 * 'unread data', now 0. newb is the number of new bytes so far 353 */ 354 s->packet = s->s2->rbuf; 355 while (newb < (int)n) { 356 clear_sys_error(); 357 if (s->rbio != NULL) { 358 s->rwstate = SSL_READING; 359 i = BIO_read(s->rbio, (char *)&(s->s2->rbuf[off + newb]), 360 max - newb); 361 } else { 362 SSLerr(SSL_F_READ_N, SSL_R_READ_BIO_NOT_SET); 363 i = -1; 364 } 365# ifdef PKT_DEBUG 366 if (s->debug & 0x01) 367 sleep(1); 368# endif 369 if (i <= 0) { 370 s->s2->rbuf_left += newb; 371 return (i); 372 } 373 newb += i; 374 } 375 376 /* record unread data */ 377 if (newb > (int)n) { 378 s->s2->rbuf_offs = n + off; 379 s->s2->rbuf_left = newb - n; 380 } else { 381 s->s2->rbuf_offs = 0; 382 s->s2->rbuf_left = 0; 383 } 384 if (extend) 385 s->packet_length += n; 386 else 387 s->packet_length = n; 388 s->rwstate = SSL_NOTHING; 389 return (n); 390} 391 392int ssl2_write(SSL *s, const void *_buf, int len) 393{ 394 const unsigned char *buf = _buf; 395 unsigned int n, tot; 396 int i; 397 398 if (SSL_in_init(s) && !s->in_handshake) { 399 i = s->handshake_func(s); 400 if (i < 0) 401 return (i); 402 if (i == 0) { 403 SSLerr(SSL_F_SSL2_WRITE, SSL_R_SSL_HANDSHAKE_FAILURE); 404 return (-1); 405 } 406 } 407 408 if (s->error) { 409 ssl2_write_error(s); 410 if (s->error) 411 return (-1); 412 } 413 414 clear_sys_error(); 415 s->rwstate = SSL_NOTHING; 416 if (len <= 0) 417 return (len); 418 419 tot = s->s2->wnum; 420 s->s2->wnum = 0; 421 422 n = (len - tot); 423 for (;;) { 424 i = do_ssl_write(s, &(buf[tot]), n); 425 if (i <= 0) { 426 s->s2->wnum = tot; 427 return (i); 428 } 429 if ((i == (int)n) || (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) { 430 return (tot + i); 431 } 432 433 n -= i; 434 tot += i; 435 } 436} 437 438static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 439{ 440 int i; 441 442 /* s->s2->wpend_len != 0 MUST be true. */ 443 444 /* 445 * check that they have given us the same buffer to write 446 */ 447 if ((s->s2->wpend_tot > (int)len) || 448 ((s->s2->wpend_buf != buf) && 449 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) { 450 SSLerr(SSL_F_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY); 451 return (-1); 452 } 453 454 for (;;) { 455 clear_sys_error(); 456 if (s->wbio != NULL) { 457 s->rwstate = SSL_WRITING; 458 i = BIO_write(s->wbio, 459 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 460 (unsigned int)s->s2->wpend_len); 461 } else { 462 SSLerr(SSL_F_WRITE_PENDING, SSL_R_WRITE_BIO_NOT_SET); 463 i = -1; 464 } 465# ifdef PKT_DEBUG 466 if (s->debug & 0x01) 467 sleep(1); 468# endif 469 if (i == s->s2->wpend_len) { 470 s->s2->wpend_len = 0; 471 s->rwstate = SSL_NOTHING; 472 return (s->s2->wpend_ret); 473 } else if (i <= 0) 474 return (i); 475 s->s2->wpend_off += i; 476 s->s2->wpend_len -= i; 477 } 478} 479 480static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 481{ 482 unsigned int j, k, olen, p, mac_size, bs; 483 register unsigned char *pp; 484 485 olen = len; 486 487 /* 488 * first check if there is data from an encryption waiting to be sent - 489 * it must be sent because the other end is waiting. This will happen 490 * with non-blocking IO. We print it and then return. 491 */ 492 if (s->s2->wpend_len != 0) 493 return (write_pending(s, buf, len)); 494 495 /* set mac_size to mac size */ 496 if (s->s2->clear_text) 497 mac_size = 0; 498 else 499 mac_size = EVP_MD_size(s->write_hash); 500 501 /* lets set the pad p */ 502 if (s->s2->clear_text) { 503 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 504 len = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 505 p = 0; 506 s->s2->three_byte_header = 0; 507 /* len=len; */ 508 } else { 509 bs = EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 510 j = len + mac_size; 511 /* 512 * Two-byte headers allow for a larger record length than three-byte 513 * headers, but we can't use them if we need padding or if we have to 514 * set the escape bit. 515 */ 516 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && (!s->s2->escape)) { 517 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 518 j = SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 519 /* 520 * set k to the max number of bytes with 2 byte header 521 */ 522 k = j - (j % bs); 523 /* how many data bytes? */ 524 len = k - mac_size; 525 s->s2->three_byte_header = 0; 526 p = 0; 527 } else if ((bs <= 1) && (!s->s2->escape)) { 528 /*- 529 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 530 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 531 */ 532 s->s2->three_byte_header = 0; 533 p = 0; 534 } else { /* we may have to use a 3 byte header */ 535 536 /*- 537 * If s->s2->escape is not set, then 538 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 539 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. 540 */ 541 p = (j % bs); 542 p = (p == 0) ? 0 : (bs - p); 543 if (s->s2->escape) { 544 s->s2->three_byte_header = 1; 545 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 546 j = SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 547 } else 548 s->s2->three_byte_header = (p == 0) ? 0 : 1; 549 } 550 } 551 552 /*- 553 * Now 554 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 555 * holds, and if s->s2->three_byte_header is set, then even 556 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 557 */ 558 559 /* 560 * mac_size is the number of MAC bytes len is the number of data bytes we 561 * are going to send p is the number of padding bytes (if it is a 562 * two-byte header, then p == 0) 563 */ 564 565 s->s2->wlength = len; 566 s->s2->padding = p; 567 s->s2->mac_data = &(s->s2->wbuf[3]); 568 s->s2->wact_data = &(s->s2->wbuf[3 + mac_size]); 569 /* we copy the data into s->s2->wbuf */ 570 memcpy(s->s2->wact_data, buf, len); 571 if (p) 572 memset(&(s->s2->wact_data[len]), 0, p); /* arbitrary padding */ 573 574 if (!s->s2->clear_text) { 575 s->s2->wact_data_length = len + p; 576 ssl2_mac(s, s->s2->mac_data, 1); 577 s->s2->wlength += p + mac_size; 578 ssl2_enc(s, 1); 579 } 580 581 /* package up the header */ 582 s->s2->wpend_len = s->s2->wlength; 583 if (s->s2->three_byte_header) { /* 3 byte header */ 584 pp = s->s2->mac_data; 585 pp -= 3; 586 pp[0] = (s->s2->wlength >> 8) & (THREE_BYTE_MASK >> 8); 587 if (s->s2->escape) 588 pp[0] |= SEC_ESC_BIT; 589 pp[1] = s->s2->wlength & 0xff; 590 pp[2] = s->s2->padding; 591 s->s2->wpend_len += 3; 592 } else { 593 pp = s->s2->mac_data; 594 pp -= 2; 595 pp[0] = ((s->s2->wlength >> 8) & (TWO_BYTE_MASK >> 8)) | TWO_BYTE_BIT; 596 pp[1] = s->s2->wlength & 0xff; 597 s->s2->wpend_len += 2; 598 } 599 s->s2->write_ptr = pp; 600 601 INC32(s->s2->write_sequence); /* expect next number */ 602 603 /* lets try to actually write the data */ 604 s->s2->wpend_tot = olen; 605 s->s2->wpend_buf = buf; 606 607 s->s2->wpend_ret = len; 608 609 s->s2->wpend_off = 0; 610 return (write_pending(s, buf, olen)); 611} 612 613int ssl2_part_read(SSL *s, unsigned long f, int i) 614{ 615 unsigned char *p; 616 int j; 617 618 if (i < 0) { 619 /* ssl2_return_error(s); */ 620 /* 621 * for non-blocking io, this is not necessarily fatal 622 */ 623 return (i); 624 } else { 625 s->init_num += i; 626 627 /* 628 * Check for error. While there are recoverable errors, this 629 * function is not called when those must be expected; any error 630 * detected here is fatal. 631 */ 632 if (s->init_num >= 3) { 633 p = (unsigned char *)s->init_buf->data; 634 if (p[0] == SSL2_MT_ERROR) { 635 j = (p[1] << 8) | p[2]; 636 SSLerr((int)f, ssl_mt_error(j)); 637 s->init_num -= 3; 638 if (s->init_num > 0) 639 memmove(p, p + 3, s->init_num); 640 } 641 } 642 643 /* 644 * If it's not an error message, we have some error anyway -- the 645 * message was shorter than expected. This too is treated as fatal 646 * (at least if SSL_get_error is asked for its opinion). 647 */ 648 return (0); 649 } 650} 651 652int ssl2_do_write(SSL *s) 653{ 654 int ret; 655 656 ret = ssl2_write(s, &s->init_buf->data[s->init_off], s->init_num); 657 if (ret == s->init_num) { 658 if (s->msg_callback) 659 s->msg_callback(1, s->version, 0, s->init_buf->data, 660 (size_t)(s->init_off + s->init_num), s, 661 s->msg_callback_arg); 662 return (1); 663 } 664 if (ret < 0) 665 return (-1); 666 s->init_off += ret; 667 s->init_num -= ret; 668 return (0); 669} 670 671static int ssl_mt_error(int n) 672{ 673 int ret; 674 675 switch (n) { 676 case SSL2_PE_NO_CIPHER: 677 ret = SSL_R_PEER_ERROR_NO_CIPHER; 678 break; 679 case SSL2_PE_NO_CERTIFICATE: 680 ret = SSL_R_PEER_ERROR_NO_CERTIFICATE; 681 break; 682 case SSL2_PE_BAD_CERTIFICATE: 683 ret = SSL_R_PEER_ERROR_CERTIFICATE; 684 break; 685 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 686 ret = SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 687 break; 688 default: 689 ret = SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 690 break; 691 } 692 return (ret); 693} 694#else /* !OPENSSL_NO_SSL2 */ 695 696# if PEDANTIC 697static void *dummy = &dummy; 698# endif 699 700#endif 701