1 /* ssl/s2_pkt.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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 117 118 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); 119 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); 120 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); 121 static int ssl_mt_error(int n); 122 123 124 /* SSL 2.0 imlementation for SSL_read/SSL_peek - 125 * This routine will return 0 to len bytes, decrypted etc if required. 126 */ 127 static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) 128 { 129 int n; 130 unsigned char mac[MAX_MAC_SIZE]; 131 unsigned char *p; 132 int i; 133 unsigned int mac_size; 134 135 ssl2_read_again: 136 if (SSL_in_init(s) && !s->in_handshake) 137 { 138 n=s->handshake_func(s); 139 if (n < 0) return(n); 140 if (n == 0) 141 { 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) return(len); 150 151 if (s->s2->ract_data_length != 0) /* read from buffer */ 152 { 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 { 161 s->s2->ract_data_length-=n; 162 s->s2->ract_data+=n; 163 if (s->s2->ract_data_length == 0) 164 s->rstate=SSL_ST_READ_HEADER; 165 } 166 167 return(n); 168 } 169 170 /* s->s2->ract_data_length == 0 171 * 172 * Fill the buffer, then goto ssl2_read_again. 173 */ 174 175 if (s->rstate == SSL_ST_READ_HEADER) 176 { 177 if (s->first_packet) 178 { 179 n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); 180 if (n <= 0) return(n); /* error or non-blocking */ 181 s->first_packet=0; 182 p=s->packet; 183 if (!((p[0] & 0x80) && ( 184 (p[2] == SSL2_MT_CLIENT_HELLO) || 185 (p[2] == SSL2_MT_SERVER_HELLO)))) 186 { 187 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET); 188 return(-1); 189 } 190 } 191 else 192 { 193 n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); 194 if (n <= 0) return(n); /* error or non-blocking */ 195 } 196 /* part read stuff */ 197 198 s->rstate=SSL_ST_READ_BODY; 199 p=s->packet; 200 /* Do header */ 201 /*s->s2->padding=0;*/ 202 s->s2->escape=0; 203 s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]); 204 if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */ 205 { 206 s->s2->three_byte_header=0; 207 s->s2->rlength&=TWO_BYTE_MASK; 208 } 209 else 210 { 211 s->s2->three_byte_header=1; 212 s->s2->rlength&=THREE_BYTE_MASK; 213 214 /* security >s2->escape */ 215 s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0; 216 } 217 } 218 219 if (s->rstate == SSL_ST_READ_BODY) 220 { 221 n=s->s2->rlength+2+s->s2->three_byte_header; 222 if (n > (int)s->packet_length) 223 { 224 n-=s->packet_length; 225 i=read_n(s,(unsigned int)n,(unsigned int)n,1); 226 if (i <= 0) return(i); /* ERROR */ 227 } 228 229 p= &(s->packet[2]); 230 s->rstate=SSL_ST_READ_HEADER; 231 if (s->s2->three_byte_header) 232 s->s2->padding= *(p++); 233 else s->s2->padding=0; 234 235 /* Data portion */ 236 if (s->s2->clear_text) 237 { 238 mac_size = 0; 239 s->s2->mac_data=p; 240 s->s2->ract_data=p; 241 if (s->s2->padding) 242 { 243 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); 244 return(-1); 245 } 246 } 247 else 248 { 249 mac_size=EVP_MD_size(s->read_hash); 250 OPENSSL_assert(mac_size <= MAX_MAC_SIZE); 251 s->s2->mac_data=p; 252 s->s2->ract_data= &p[mac_size]; 253 if (s->s2->padding + mac_size > s->s2->rlength) 254 { 255 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); 256 return(-1); 257 } 258 } 259 260 s->s2->ract_data_length=s->s2->rlength; 261 /* added a check for length > max_size in case 262 * encryption was not turned on yet due to an error */ 263 if ((!s->s2->clear_text) && 264 (s->s2->rlength >= mac_size)) 265 { 266 ssl2_enc(s,0); 267 s->s2->ract_data_length-=mac_size; 268 ssl2_mac(s,mac,0); 269 s->s2->ract_data_length-=s->s2->padding; 270 if ( (memcmp(mac,s->s2->mac_data, 271 (unsigned int)mac_size) != 0) || 272 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) 273 { 274 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); 275 return(-1); 276 } 277 } 278 INC32(s->s2->read_sequence); /* expect next number */ 279 /* s->s2->ract_data is now available for processing */ 280 281 /* Possibly the packet that we just read had 0 actual data bytes. 282 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) 283 * In this case, returning 0 would be interpreted by the caller 284 * as indicating EOF, so it's not a good idea. Instead, we just 285 * continue reading; thus ssl2_read_internal may have to process 286 * multiple packets before it can return. 287 * 288 * [Note that using select() for blocking sockets *never* guarantees 289 * that the next SSL_read will not block -- the available 290 * data may contain incomplete packets, and except for SSL 2, 291 * renegotiation can confuse things even more.] */ 292 293 goto ssl2_read_again; /* This should really be 294 * "return ssl2_read(s,buf,len)", 295 * but that would allow for 296 * denial-of-service attacks if a 297 * C compiler is used that does not 298 * recognize end-recursion. */ 299 } 300 else 301 { 302 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); 303 return(-1); 304 } 305 } 306 307 int ssl2_read(SSL *s, void *buf, int len) 308 { 309 return ssl2_read_internal(s, buf, len, 0); 310 } 311 312 int ssl2_peek(SSL *s, void *buf, int len) 313 { 314 return ssl2_read_internal(s, buf, len, 1); 315 } 316 317 static int read_n(SSL *s, unsigned int n, unsigned int max, 318 unsigned int extend) 319 { 320 int i,off,newb; 321 322 /* if there is stuff still in the buffer from a previous read, 323 * and there is more than we want, take some. */ 324 if (s->s2->rbuf_left >= (int)n) 325 { 326 if (extend) 327 s->packet_length+=n; 328 else 329 { 330 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); 331 s->packet_length=n; 332 } 333 s->s2->rbuf_left-=n; 334 s->s2->rbuf_offs+=n; 335 return(n); 336 } 337 338 if (!s->read_ahead) max=n; 339 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) 340 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; 341 342 343 /* Else we want more than we have. 344 * First, if there is some left or we want to extend */ 345 off=0; 346 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) 347 { 348 newb=s->s2->rbuf_left; 349 if (extend) 350 { 351 off=s->packet_length; 352 if (s->packet != s->s2->rbuf) 353 memcpy(s->s2->rbuf,s->packet, 354 (unsigned int)newb+off); 355 } 356 else if (s->s2->rbuf_offs != 0) 357 { 358 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), 359 (unsigned int)newb); 360 s->s2->rbuf_offs=0; 361 } 362 s->s2->rbuf_left=0; 363 } 364 else 365 newb=0; 366 367 /* off is the offset to start writing too. 368 * r->s2->rbuf_offs is the 'unread data', now 0. 369 * newb is the number of new bytes so far 370 */ 371 s->packet=s->s2->rbuf; 372 while (newb < (int)n) 373 { 374 clear_sys_error(); 375 if (s->rbio != NULL) 376 { 377 s->rwstate=SSL_READING; 378 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), 379 max-newb); 380 } 381 else 382 { 383 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); 384 i= -1; 385 } 386 #ifdef PKT_DEBUG 387 if (s->debug & 0x01) sleep(1); 388 #endif 389 if (i <= 0) 390 { 391 s->s2->rbuf_left+=newb; 392 return(i); 393 } 394 newb+=i; 395 } 396 397 /* record unread data */ 398 if (newb > (int)n) 399 { 400 s->s2->rbuf_offs=n+off; 401 s->s2->rbuf_left=newb-n; 402 } 403 else 404 { 405 s->s2->rbuf_offs=0; 406 s->s2->rbuf_left=0; 407 } 408 if (extend) 409 s->packet_length+=n; 410 else 411 s->packet_length=n; 412 s->rwstate=SSL_NOTHING; 413 return(n); 414 } 415 416 int ssl2_write(SSL *s, const void *_buf, int len) 417 { 418 const unsigned char *buf=_buf; 419 unsigned int n,tot; 420 int i; 421 422 if (SSL_in_init(s) && !s->in_handshake) 423 { 424 i=s->handshake_func(s); 425 if (i < 0) return(i); 426 if (i == 0) 427 { 428 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); 429 return(-1); 430 } 431 } 432 433 if (s->error) 434 { 435 ssl2_write_error(s); 436 if (s->error) 437 return(-1); 438 } 439 440 clear_sys_error(); 441 s->rwstate=SSL_NOTHING; 442 if (len <= 0) return(len); 443 444 tot=s->s2->wnum; 445 s->s2->wnum=0; 446 447 n=(len-tot); 448 for (;;) 449 { 450 i=do_ssl_write(s,&(buf[tot]),n); 451 if (i <= 0) 452 { 453 s->s2->wnum=tot; 454 return(i); 455 } 456 if ((i == (int)n) || 457 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) 458 { 459 return(tot+i); 460 } 461 462 n-=i; 463 tot+=i; 464 } 465 } 466 467 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) 468 { 469 int i; 470 471 /* s->s2->wpend_len != 0 MUST be true. */ 472 473 /* check that they have given us the same buffer to 474 * write */ 475 if ((s->s2->wpend_tot > (int)len) || 476 ((s->s2->wpend_buf != buf) && 477 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) 478 { 479 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); 480 return(-1); 481 } 482 483 for (;;) 484 { 485 clear_sys_error(); 486 if (s->wbio != NULL) 487 { 488 s->rwstate=SSL_WRITING; 489 i=BIO_write(s->wbio, 490 (char *)&(s->s2->write_ptr[s->s2->wpend_off]), 491 (unsigned int)s->s2->wpend_len); 492 } 493 else 494 { 495 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); 496 i= -1; 497 } 498 #ifdef PKT_DEBUG 499 if (s->debug & 0x01) sleep(1); 500 #endif 501 if (i == s->s2->wpend_len) 502 { 503 s->s2->wpend_len=0; 504 s->rwstate=SSL_NOTHING; 505 return(s->s2->wpend_ret); 506 } 507 else if (i <= 0) 508 return(i); 509 s->s2->wpend_off+=i; 510 s->s2->wpend_len-=i; 511 } 512 } 513 514 static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) 515 { 516 unsigned int j,k,olen,p,mac_size,bs; 517 register unsigned char *pp; 518 519 olen=len; 520 521 /* first check if there is data from an encryption waiting to 522 * be sent - it must be sent because the other end is waiting. 523 * This will happen with non-blocking IO. We print it and then 524 * return. 525 */ 526 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); 527 528 /* set mac_size to mac size */ 529 if (s->s2->clear_text) 530 mac_size=0; 531 else 532 mac_size=EVP_MD_size(s->write_hash); 533 534 /* lets set the pad p */ 535 if (s->s2->clear_text) 536 { 537 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 538 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 539 p=0; 540 s->s2->three_byte_header=0; 541 /* len=len; */ 542 } 543 else 544 { 545 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); 546 j=len+mac_size; 547 /* Two-byte headers allow for a larger record length than 548 * three-byte headers, but we can't use them if we need 549 * padding or if we have to set the escape bit. */ 550 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && 551 (!s->s2->escape)) 552 { 553 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) 554 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; 555 /* set k to the max number of bytes with 2 556 * byte header */ 557 k=j-(j%bs); 558 /* how many data bytes? */ 559 len=k-mac_size; 560 s->s2->three_byte_header=0; 561 p=0; 562 } 563 else if ((bs <= 1) && (!s->s2->escape)) 564 { 565 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus 566 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ 567 s->s2->three_byte_header=0; 568 p=0; 569 } 570 else /* we may have to use a 3 byte header */ 571 { 572 /* If s->s2->escape is not set, then 573 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus 574 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ 575 p=(j%bs); 576 p=(p == 0)?0:(bs-p); 577 if (s->s2->escape) 578 { 579 s->s2->three_byte_header=1; 580 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) 581 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; 582 } 583 else 584 s->s2->three_byte_header=(p == 0)?0:1; 585 } 586 } 587 588 /* Now 589 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER 590 * holds, and if s->s2->three_byte_header is set, then even 591 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. 592 */ 593 594 /* mac_size is the number of MAC bytes 595 * len is the number of data bytes we are going to send 596 * p is the number of padding bytes 597 * (if it is a two-byte header, then p == 0) */ 598 599 s->s2->wlength=len; 600 s->s2->padding=p; 601 s->s2->mac_data= &(s->s2->wbuf[3]); 602 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); 603 /* we copy the data into s->s2->wbuf */ 604 memcpy(s->s2->wact_data,buf,len); 605 if (p) 606 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ 607 608 if (!s->s2->clear_text) 609 { 610 s->s2->wact_data_length=len+p; 611 ssl2_mac(s,s->s2->mac_data,1); 612 s->s2->wlength+=p+mac_size; 613 ssl2_enc(s,1); 614 } 615 616 /* package up the header */ 617 s->s2->wpend_len=s->s2->wlength; 618 if (s->s2->three_byte_header) /* 3 byte header */ 619 { 620 pp=s->s2->mac_data; 621 pp-=3; 622 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); 623 if (s->s2->escape) pp[0]|=SEC_ESC_BIT; 624 pp[1]=s->s2->wlength&0xff; 625 pp[2]=s->s2->padding; 626 s->s2->wpend_len+=3; 627 } 628 else 629 { 630 pp=s->s2->mac_data; 631 pp-=2; 632 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; 633 pp[1]=s->s2->wlength&0xff; 634 s->s2->wpend_len+=2; 635 } 636 s->s2->write_ptr=pp; 637 638 INC32(s->s2->write_sequence); /* expect next number */ 639 640 /* lets try to actually write the data */ 641 s->s2->wpend_tot=olen; 642 s->s2->wpend_buf=buf; 643 644 s->s2->wpend_ret=len; 645 646 s->s2->wpend_off=0; 647 return(write_pending(s,buf,olen)); 648 } 649 650 int ssl2_part_read(SSL *s, unsigned long f, int i) 651 { 652 unsigned char *p; 653 int j; 654 655 if (i < 0) 656 { 657 /* ssl2_return_error(s); */ 658 /* for non-blocking io, 659 * this is not necessarily fatal */ 660 return(i); 661 } 662 else 663 { 664 s->init_num+=i; 665 666 /* Check for error. While there are recoverable errors, 667 * this function is not called when those must be expected; 668 * any error detected here is fatal. */ 669 if (s->init_num >= 3) 670 { 671 p=(unsigned char *)s->init_buf->data; 672 if (p[0] == SSL2_MT_ERROR) 673 { 674 j=(p[1]<<8)|p[2]; 675 SSLerr((int)f,ssl_mt_error(j)); 676 s->init_num -= 3; 677 if (s->init_num > 0) 678 memmove(p, p+3, s->init_num); 679 } 680 } 681 682 /* If it's not an error message, we have some error anyway -- 683 * the message was shorter than expected. This too is treated 684 * as fatal (at least if SSL_get_error is asked for its opinion). */ 685 return(0); 686 } 687 } 688 689 int ssl2_do_write(SSL *s) 690 { 691 int ret; 692 693 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); 694 if (ret == s->init_num) 695 { 696 if (s->msg_callback) 697 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); 698 return(1); 699 } 700 if (ret < 0) 701 return(-1); 702 s->init_off+=ret; 703 s->init_num-=ret; 704 return(0); 705 } 706 707 static int ssl_mt_error(int n) 708 { 709 int ret; 710 711 switch (n) 712 { 713 case SSL2_PE_NO_CIPHER: 714 ret=SSL_R_PEER_ERROR_NO_CIPHER; 715 break; 716 case SSL2_PE_NO_CERTIFICATE: 717 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; 718 break; 719 case SSL2_PE_BAD_CERTIFICATE: 720 ret=SSL_R_PEER_ERROR_CERTIFICATE; 721 break; 722 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: 723 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; 724 break; 725 default: 726 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; 727 break; 728 } 729 return(ret); 730 } 731 #else /* !OPENSSL_NO_SSL2 */ 732 733 # if PEDANTIC 734 static void *dummy=&dummy; 735 # endif 736 737 #endif 738
