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
118 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
119 static int n_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 */
ssl2_read_internal(SSL * s,void * buf,int len,int peek)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 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_CTX_size(s->read_hash);
250 if (mac_size < 0)
251 return -1;
252 OPENSSL_assert(mac_size <= MAX_MAC_SIZE);
253 s->s2->mac_data=p;
254 s->s2->ract_data= &p[mac_size];
255 if (s->s2->padding + mac_size > s->s2->rlength)
256 {
257 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
258 return(-1);
259 }
260 }
261
262 s->s2->ract_data_length=s->s2->rlength;
263 /* added a check for length > max_size in case
264 * encryption was not turned on yet due to an error */
265 if ((!s->s2->clear_text) &&
266 (s->s2->rlength >= (unsigned int)mac_size))
267 {
268 ssl2_enc(s,0);
269 s->s2->ract_data_length-=mac_size;
270 ssl2_mac(s,mac,0);
271 s->s2->ract_data_length-=s->s2->padding;
272 if ( (memcmp(mac,s->s2->mac_data,
273 (unsigned int)mac_size) != 0) ||
274 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
275 {
276 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
277 return(-1);
278 }
279 }
280 INC32(s->s2->read_sequence); /* expect next number */
281 /* s->s2->ract_data is now available for processing */
282
283 /* Possibly the packet that we just read had 0 actual data bytes.
284 * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
285 * In this case, returning 0 would be interpreted by the caller
286 * as indicating EOF, so it's not a good idea. Instead, we just
287 * continue reading; thus ssl2_read_internal may have to process
288 * multiple packets before it can return.
289 *
290 * [Note that using select() for blocking sockets *never* guarantees
291 * that the next SSL_read will not block -- the available
292 * data may contain incomplete packets, and except for SSL 2,
293 * renegotiation can confuse things even more.] */
294
295 goto ssl2_read_again; /* This should really be
296 * "return ssl2_read(s,buf,len)",
297 * but that would allow for
298 * denial-of-service attacks if a
299 * C compiler is used that does not
300 * recognize end-recursion. */
301 }
302 else
303 {
304 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
305 return(-1);
306 }
307 }
308
ssl2_read(SSL * s,void * buf,int len)309 int ssl2_read(SSL *s, void *buf, int len)
310 {
311 return ssl2_read_internal(s, buf, len, 0);
312 }
313
ssl2_peek(SSL * s,void * buf,int len)314 int ssl2_peek(SSL *s, void *buf, int len)
315 {
316 return ssl2_read_internal(s, buf, len, 1);
317 }
318
read_n(SSL * s,unsigned int n,unsigned int max,unsigned int extend)319 static int read_n(SSL *s, unsigned int n, unsigned int max,
320 unsigned int extend)
321 {
322 int i,off,newb;
323
324 /* if there is stuff still in the buffer from a previous read,
325 * and there is more than we want, take some. */
326 if (s->s2->rbuf_left >= (int)n)
327 {
328 if (extend)
329 s->packet_length+=n;
330 else
331 {
332 s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
333 s->packet_length=n;
334 }
335 s->s2->rbuf_left-=n;
336 s->s2->rbuf_offs+=n;
337 return(n);
338 }
339
340 if (!s->read_ahead) max=n;
341 if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
342 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
343
344
345 /* Else we want more than we have.
346 * First, if there is some left or we want to extend */
347 off=0;
348 if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
349 {
350 newb=s->s2->rbuf_left;
351 if (extend)
352 {
353 off=s->packet_length;
354 if (s->packet != s->s2->rbuf)
355 memcpy(s->s2->rbuf,s->packet,
356 (unsigned int)newb+off);
357 }
358 else if (s->s2->rbuf_offs != 0)
359 {
360 memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
361 (unsigned int)newb);
362 s->s2->rbuf_offs=0;
363 }
364 s->s2->rbuf_left=0;
365 }
366 else
367 newb=0;
368
369 /* off is the offset to start writing too.
370 * r->s2->rbuf_offs is the 'unread data', now 0.
371 * newb is the number of new bytes so far
372 */
373 s->packet=s->s2->rbuf;
374 while (newb < (int)n)
375 {
376 clear_sys_error();
377 if (s->rbio != NULL)
378 {
379 s->rwstate=SSL_READING;
380 i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
381 max-newb);
382 }
383 else
384 {
385 SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
386 i= -1;
387 }
388 #ifdef PKT_DEBUG
389 if (s->debug & 0x01) sleep(1);
390 #endif
391 if (i <= 0)
392 {
393 s->s2->rbuf_left+=newb;
394 return(i);
395 }
396 newb+=i;
397 }
398
399 /* record unread data */
400 if (newb > (int)n)
401 {
402 s->s2->rbuf_offs=n+off;
403 s->s2->rbuf_left=newb-n;
404 }
405 else
406 {
407 s->s2->rbuf_offs=0;
408 s->s2->rbuf_left=0;
409 }
410 if (extend)
411 s->packet_length+=n;
412 else
413 s->packet_length=n;
414 s->rwstate=SSL_NOTHING;
415 return(n);
416 }
417
ssl2_write(SSL * s,const void * _buf,int len)418 int ssl2_write(SSL *s, const void *_buf, int len)
419 {
420 const unsigned char *buf=_buf;
421 unsigned int n,tot;
422 int i;
423
424 if (SSL_in_init(s) && !s->in_handshake)
425 {
426 i=s->handshake_func(s);
427 if (i < 0) return(i);
428 if (i == 0)
429 {
430 SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
431 return(-1);
432 }
433 }
434
435 if (s->error)
436 {
437 ssl2_write_error(s);
438 if (s->error)
439 return(-1);
440 }
441
442 clear_sys_error();
443 s->rwstate=SSL_NOTHING;
444 if (len <= 0) return(len);
445
446 tot=s->s2->wnum;
447 s->s2->wnum=0;
448
449 n=(len-tot);
450 for (;;)
451 {
452 i=n_do_ssl_write(s,&(buf[tot]),n);
453 if (i <= 0)
454 {
455 s->s2->wnum=tot;
456 return(i);
457 }
458 if ((i == (int)n) ||
459 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
460 {
461 return(tot+i);
462 }
463
464 n-=i;
465 tot+=i;
466 }
467 }
468
write_pending(SSL * s,const unsigned char * buf,unsigned int len)469 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
470 {
471 int i;
472
473 /* s->s2->wpend_len != 0 MUST be true. */
474
475 /* check that they have given us the same buffer to
476 * write */
477 if ((s->s2->wpend_tot > (int)len) ||
478 ((s->s2->wpend_buf != buf) &&
479 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
480 {
481 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
482 return(-1);
483 }
484
485 for (;;)
486 {
487 clear_sys_error();
488 if (s->wbio != NULL)
489 {
490 s->rwstate=SSL_WRITING;
491 i=BIO_write(s->wbio,
492 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
493 (unsigned int)s->s2->wpend_len);
494 }
495 else
496 {
497 SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
498 i= -1;
499 }
500 #ifdef PKT_DEBUG
501 if (s->debug & 0x01) sleep(1);
502 #endif
503 if (i == s->s2->wpend_len)
504 {
505 s->s2->wpend_len=0;
506 s->rwstate=SSL_NOTHING;
507 return(s->s2->wpend_ret);
508 }
509 else if (i <= 0)
510 return(i);
511 s->s2->wpend_off+=i;
512 s->s2->wpend_len-=i;
513 }
514 }
515
n_do_ssl_write(SSL * s,const unsigned char * buf,unsigned int len)516 static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
517 {
518 unsigned int j,k,olen,p,bs;
519 int mac_size;
520 register unsigned char *pp;
521
522 olen=len;
523
524 /* first check if there is data from an encryption waiting to
525 * be sent - it must be sent because the other end is waiting.
526 * This will happen with non-blocking IO. We print it and then
527 * return.
528 */
529 if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
530
531 /* set mac_size to mac size */
532 if (s->s2->clear_text)
533 mac_size=0;
534 else
535 {
536 mac_size=EVP_MD_CTX_size(s->write_hash);
537 if (mac_size < 0)
538 return -1;
539 }
540
541 /* lets set the pad p */
542 if (s->s2->clear_text)
543 {
544 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
545 len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
546 p=0;
547 s->s2->three_byte_header=0;
548 /* len=len; */
549 }
550 else
551 {
552 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
553 j=len+mac_size;
554 /* Two-byte headers allow for a larger record length than
555 * three-byte headers, but we can't use them if we need
556 * padding or if we have to set the escape bit. */
557 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
558 (!s->s2->escape))
559 {
560 if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
561 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
562 /* set k to the max number of bytes with 2
563 * byte header */
564 k=j-(j%bs);
565 /* how many data bytes? */
566 len=k-mac_size;
567 s->s2->three_byte_header=0;
568 p=0;
569 }
570 else if ((bs <= 1) && (!s->s2->escape))
571 {
572 /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
573 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
574 s->s2->three_byte_header=0;
575 p=0;
576 }
577 else /* we may have to use a 3 byte header */
578 {
579 /* If s->s2->escape is not set, then
580 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
581 * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
582 p=(j%bs);
583 p=(p == 0)?0:(bs-p);
584 if (s->s2->escape)
585 {
586 s->s2->three_byte_header=1;
587 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
588 j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
589 }
590 else
591 s->s2->three_byte_header=(p == 0)?0:1;
592 }
593 }
594
595 /* Now
596 * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
597 * holds, and if s->s2->three_byte_header is set, then even
598 * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
599 */
600
601 /* mac_size is the number of MAC bytes
602 * len is the number of data bytes we are going to send
603 * p is the number of padding bytes
604 * (if it is a two-byte header, then p == 0) */
605
606 s->s2->wlength=len;
607 s->s2->padding=p;
608 s->s2->mac_data= &(s->s2->wbuf[3]);
609 s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
610 /* we copy the data into s->s2->wbuf */
611 memcpy(s->s2->wact_data,buf,len);
612 if (p)
613 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
614
615 if (!s->s2->clear_text)
616 {
617 s->s2->wact_data_length=len+p;
618 ssl2_mac(s,s->s2->mac_data,1);
619 s->s2->wlength+=p+mac_size;
620 ssl2_enc(s,1);
621 }
622
623 /* package up the header */
624 s->s2->wpend_len=s->s2->wlength;
625 if (s->s2->three_byte_header) /* 3 byte header */
626 {
627 pp=s->s2->mac_data;
628 pp-=3;
629 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
630 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
631 pp[1]=s->s2->wlength&0xff;
632 pp[2]=s->s2->padding;
633 s->s2->wpend_len+=3;
634 }
635 else
636 {
637 pp=s->s2->mac_data;
638 pp-=2;
639 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
640 pp[1]=s->s2->wlength&0xff;
641 s->s2->wpend_len+=2;
642 }
643 s->s2->write_ptr=pp;
644
645 INC32(s->s2->write_sequence); /* expect next number */
646
647 /* lets try to actually write the data */
648 s->s2->wpend_tot=olen;
649 s->s2->wpend_buf=buf;
650
651 s->s2->wpend_ret=len;
652
653 s->s2->wpend_off=0;
654 return(write_pending(s,buf,olen));
655 }
656
ssl2_part_read(SSL * s,unsigned long f,int i)657 int ssl2_part_read(SSL *s, unsigned long f, int i)
658 {
659 unsigned char *p;
660 int j;
661
662 if (i < 0)
663 {
664 /* ssl2_return_error(s); */
665 /* for non-blocking io,
666 * this is not necessarily fatal */
667 return(i);
668 }
669 else
670 {
671 s->init_num+=i;
672
673 /* Check for error. While there are recoverable errors,
674 * this function is not called when those must be expected;
675 * any error detected here is fatal. */
676 if (s->init_num >= 3)
677 {
678 p=(unsigned char *)s->init_buf->data;
679 if (p[0] == SSL2_MT_ERROR)
680 {
681 j=(p[1]<<8)|p[2];
682 SSLerr((int)f,ssl_mt_error(j));
683 s->init_num -= 3;
684 if (s->init_num > 0)
685 memmove(p, p+3, s->init_num);
686 }
687 }
688
689 /* If it's not an error message, we have some error anyway --
690 * the message was shorter than expected. This too is treated
691 * as fatal (at least if SSL_get_error is asked for its opinion). */
692 return(0);
693 }
694 }
695
ssl2_do_write(SSL * s)696 int ssl2_do_write(SSL *s)
697 {
698 int ret;
699
700 ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
701 if (ret == s->init_num)
702 {
703 if (s->msg_callback)
704 s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
705 return(1);
706 }
707 if (ret < 0)
708 return(-1);
709 s->init_off+=ret;
710 s->init_num-=ret;
711 return(0);
712 }
713
ssl_mt_error(int n)714 static int ssl_mt_error(int n)
715 {
716 int ret;
717
718 switch (n)
719 {
720 case SSL2_PE_NO_CIPHER:
721 ret=SSL_R_PEER_ERROR_NO_CIPHER;
722 break;
723 case SSL2_PE_NO_CERTIFICATE:
724 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
725 break;
726 case SSL2_PE_BAD_CERTIFICATE:
727 ret=SSL_R_PEER_ERROR_CERTIFICATE;
728 break;
729 case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
730 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
731 break;
732 default:
733 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
734 break;
735 }
736 return(ret);
737 }
738 #else /* !OPENSSL_NO_SSL2 */
739
740 # if PEDANTIC
741 static void *dummy=&dummy;
742 # endif
743
744 #endif
745