[PR3597] Advance to the next state variant when reusing messages.
[openssl.git] / ssl / s2_pkt.c
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  */
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                         if(!ssl2_enc(s,0))
269                                 {
270                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_DECRYPTION_FAILED);
271                                 return(-1);
272                                 }
273                         s->s2->ract_data_length-=mac_size;
274                         ssl2_mac(s,mac,0);
275                         s->s2->ract_data_length-=s->s2->padding;
276                         if (    (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) ||
277                                 (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
278                                 {
279                                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
280                                 return(-1);
281                                 }
282                         }
283                 INC32(s->s2->read_sequence); /* expect next number */
284                 /* s->s2->ract_data is now available for processing */
285
286                 /* Possibly the packet that we just read had 0 actual data bytes.
287                  * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
288                  * In this case, returning 0 would be interpreted by the caller
289                  * as indicating EOF, so it's not a good idea.  Instead, we just
290                  * continue reading; thus ssl2_read_internal may have to process
291                  * multiple packets before it can return.
292                  *
293                  * [Note that using select() for blocking sockets *never* guarantees
294                  * that the next SSL_read will not block -- the available
295                  * data may contain incomplete packets, and except for SSL 2,
296                  * renegotiation can confuse things even more.] */
297
298                 goto ssl2_read_again; /* This should really be
299                                        * "return ssl2_read(s,buf,len)",
300                                        * but that would allow for
301                                        * denial-of-service attacks if a
302                                        * C compiler is used that does not
303                                        * recognize end-recursion. */
304                 }
305         else
306                 {
307                 SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
308                         return(-1);
309                 }
310         }
311
312 int ssl2_read(SSL *s, void *buf, int len)
313         {
314         return ssl2_read_internal(s, buf, len, 0);
315         }
316
317 int ssl2_peek(SSL *s, void *buf, int len)
318         {
319         return ssl2_read_internal(s, buf, len, 1);
320         }
321
322 static int read_n(SSL *s, unsigned int n, unsigned int max,
323              unsigned int extend)
324         {
325         int i,off,newb;
326
327         /* if there is stuff still in the buffer from a previous read,
328          * and there is more than we want, take some. */
329         if (s->s2->rbuf_left >= (int)n)
330                 {
331                 if (extend)
332                         s->packet_length+=n;
333                 else
334                         {
335                         s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
336                         s->packet_length=n;
337                         }
338                 s->s2->rbuf_left-=n;
339                 s->s2->rbuf_offs+=n;
340                 return(n);
341                 }
342
343         if (!s->read_ahead) max=n;
344         if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
345                 max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
346         
347
348         /* Else we want more than we have.
349          * First, if there is some left or we want to extend */
350         off=0;
351         if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
352                 {
353                 newb=s->s2->rbuf_left;
354                 if (extend)
355                         {
356                         off=s->packet_length;
357                         if (s->packet != s->s2->rbuf)
358                                 memcpy(s->s2->rbuf,s->packet,
359                                         (unsigned int)newb+off);
360                         }
361                 else if (s->s2->rbuf_offs != 0)
362                         {
363                         memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
364                                 (unsigned int)newb);
365                         s->s2->rbuf_offs=0;
366                         }
367                 s->s2->rbuf_left=0;
368                 }
369         else
370                 newb=0;
371
372         /* off is the offset to start writing too.
373          * r->s2->rbuf_offs is the 'unread data', now 0. 
374          * newb is the number of new bytes so far
375          */
376         s->packet=s->s2->rbuf;
377         while (newb < (int)n)
378                 {
379                 clear_sys_error();
380                 if (s->rbio != NULL)
381                         {
382                         s->rwstate=SSL_READING;
383                         i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
384                                 max-newb);
385                         }
386                 else
387                         {
388                         SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
389                         i= -1;
390                         }
391 #ifdef PKT_DEBUG
392                 if (s->debug & 0x01) sleep(1);
393 #endif
394                 if (i <= 0)
395                         {
396                         s->s2->rbuf_left+=newb;
397                         return(i);
398                         }
399                 newb+=i;
400                 }
401
402         /* record unread data */
403         if (newb > (int)n)
404                 {
405                 s->s2->rbuf_offs=n+off;
406                 s->s2->rbuf_left=newb-n;
407                 }
408         else
409                 {
410                 s->s2->rbuf_offs=0;
411                 s->s2->rbuf_left=0;
412                 }
413         if (extend)
414                 s->packet_length+=n;
415         else
416                 s->packet_length=n;
417         s->rwstate=SSL_NOTHING;
418         return(n);
419         }
420
421 int ssl2_write(SSL *s, const void *_buf, int len)
422         {
423         const unsigned char *buf=_buf;
424         unsigned int n,tot;
425         int i;
426
427         if (SSL_in_init(s) && !s->in_handshake)
428                 {
429                 i=s->handshake_func(s);
430                 if (i < 0) return(i);
431                 if (i == 0)
432                         {
433                         SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
434                         return(-1);
435                         }
436                 }
437
438         if (s->error)
439                 {
440                 ssl2_write_error(s);
441                 if (s->error)
442                         return(-1);
443                 }
444
445         clear_sys_error();
446         s->rwstate=SSL_NOTHING;
447         if (len <= 0) return(len);
448
449         tot=s->s2->wnum;
450         s->s2->wnum=0;
451
452         n=(len-tot);
453         for (;;)
454                 {
455                 i=n_do_ssl_write(s,&(buf[tot]),n);
456                 if (i <= 0)
457                         {
458                         s->s2->wnum=tot;
459                         return(i);
460                         }
461                 if ((i == (int)n) ||
462                         (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
463                         {
464                         return(tot+i);
465                         }
466                 
467                 n-=i;
468                 tot+=i;
469                 }
470         }
471
472 static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
473         {
474         int i;
475
476         /* s->s2->wpend_len != 0 MUST be true. */
477
478         /* check that they have given us the same buffer to
479          * write */
480         if ((s->s2->wpend_tot > (int)len) ||
481                 ((s->s2->wpend_buf != buf) &&
482                  !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
483                 {
484                 SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
485                 return(-1);
486                 }
487
488         for (;;)
489                 {
490                 clear_sys_error();
491                 if (s->wbio != NULL)
492                         {
493                         s->rwstate=SSL_WRITING;
494                         i=BIO_write(s->wbio,
495                                 (char *)&(s->s2->write_ptr[s->s2->wpend_off]),
496                                 (unsigned int)s->s2->wpend_len);
497                         }
498                 else
499                         {
500                         SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
501                         i= -1;
502                         }
503 #ifdef PKT_DEBUG
504                 if (s->debug & 0x01) sleep(1);
505 #endif
506                 if (i == s->s2->wpend_len)
507                         {
508                         s->s2->wpend_len=0;
509                         s->rwstate=SSL_NOTHING;
510                         return(s->s2->wpend_ret);
511                         }
512                 else if (i <= 0)
513                         return(i);
514                 s->s2->wpend_off+=i;
515                 s->s2->wpend_len-=i;
516                 }
517         }
518
519 static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
520         {
521         unsigned int j,k,olen,p,bs;
522         int mac_size;
523         register unsigned char *pp;
524
525         olen=len;
526
527         /* first check if there is data from an encryption waiting to
528          * be sent - it must be sent because the other end is waiting.
529          * This will happen with non-blocking IO.  We print it and then
530          * return.
531          */
532         if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
533
534         /* set mac_size to mac size */
535         if (s->s2->clear_text)
536                 mac_size=0;
537         else
538                 {
539                 mac_size=EVP_MD_CTX_size(s->write_hash);
540                 if (mac_size < 0)
541                         return -1;
542                 }
543
544         /* lets set the pad p */
545         if (s->s2->clear_text)
546                 {
547                 if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
548                         len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
549                 p=0;
550                 s->s2->three_byte_header=0;
551                 /* len=len; */
552                 }
553         else
554                 {
555                 bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
556                 j=len+mac_size;
557                 /* Two-byte headers allow for a larger record length than
558                  * three-byte headers, but we can't use them if we need
559                  * padding or if we have to set the escape bit. */
560                 if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
561                         (!s->s2->escape))
562                         {
563                         if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
564                                 j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
565                         /* set k to the max number of bytes with 2
566                          * byte header */
567                         k=j-(j%bs);
568                         /* how many data bytes? */
569                         len=k-mac_size; 
570                         s->s2->three_byte_header=0;
571                         p=0;
572                         }
573                 else if ((bs <= 1) && (!s->s2->escape))
574                         {
575                         /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
576                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
577                         s->s2->three_byte_header=0;
578                         p=0;
579                         }
580                 else /* we may have to use a 3 byte header */
581                         {
582                         /* If s->s2->escape is not set, then
583                          * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
584                          * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
585                         p=(j%bs);
586                         p=(p == 0)?0:(bs-p);
587                         if (s->s2->escape)
588                                 {
589                                 s->s2->three_byte_header=1;
590                                 if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
591                                         j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
592                                 }
593                         else
594                                 s->s2->three_byte_header=(p == 0)?0:1;
595                         }
596                 }
597
598         /* Now
599          *      j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
600          * holds, and if s->s2->three_byte_header is set, then even
601          *      j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
602          */
603
604         /* mac_size is the number of MAC bytes
605          * len is the number of data bytes we are going to send
606          * p is the number of padding bytes
607          * (if it is a two-byte header, then p == 0) */
608
609         s->s2->wlength=len;
610         s->s2->padding=p;
611         s->s2->mac_data= &(s->s2->wbuf[3]);
612         s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
613         /* we copy the data into s->s2->wbuf */
614         memcpy(s->s2->wact_data,buf,len);
615         if (p)
616                 memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
617
618         if (!s->s2->clear_text)
619                 {
620                 s->s2->wact_data_length=len+p;
621                 ssl2_mac(s,s->s2->mac_data,1);
622                 s->s2->wlength+=p+mac_size;
623                 if(ssl2_enc(s,1) < 1)
624                         return -1;
625                 }
626
627         /* package up the header */
628         s->s2->wpend_len=s->s2->wlength;
629         if (s->s2->three_byte_header) /* 3 byte header */
630                 {
631                 pp=s->s2->mac_data;
632                 pp-=3;
633                 pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
634                 if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
635                 pp[1]=s->s2->wlength&0xff;
636                 pp[2]=s->s2->padding;
637                 s->s2->wpend_len+=3;
638                 }
639         else
640                 {
641                 pp=s->s2->mac_data;
642                 pp-=2;
643                 pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
644                 pp[1]=s->s2->wlength&0xff;
645                 s->s2->wpend_len+=2;
646                 }
647         s->s2->write_ptr=pp;
648         
649         INC32(s->s2->write_sequence); /* expect next number */
650
651         /* lets try to actually write the data */
652         s->s2->wpend_tot=olen;
653         s->s2->wpend_buf=buf;
654
655         s->s2->wpend_ret=len;
656
657         s->s2->wpend_off=0;
658         return(write_pending(s,buf,olen));
659         }
660
661 int ssl2_part_read(SSL *s, unsigned long f, int i)
662         {
663         unsigned char *p;
664         int j;
665
666         if (i < 0)
667                 {
668                 /* ssl2_return_error(s); */
669                 /* for non-blocking io,
670                  * this is not necessarily fatal */
671                 return(i);
672                 }
673         else
674                 {
675                 s->init_num+=i;
676
677                 /* Check for error.  While there are recoverable errors,
678                  * this function is not called when those must be expected;
679                  * any error detected here is fatal. */
680                 if (s->init_num >= 3)
681                         {
682                         p=(unsigned char *)s->init_buf->data;
683                         if (p[0] == SSL2_MT_ERROR)
684                                 {
685                                 j=(p[1]<<8)|p[2];
686                                 SSLerr((int)f,ssl_mt_error(j));
687                                 s->init_num -= 3;
688                                 if (s->init_num > 0)
689                                         memmove(p, p+3, s->init_num);
690                                 }
691                         }
692
693                 /* If it's not an error message, we have some error anyway --
694                  * the message was shorter than expected.  This too is treated
695                  * as fatal (at least if SSL_get_error is asked for its opinion). */
696                 return(0);
697                 }
698         }
699
700 int ssl2_do_write(SSL *s)
701         {
702         int ret;
703
704         ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
705         if (ret == s->init_num)
706                 {
707                 if (s->msg_callback)
708                         s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
709                 return(1);
710                 }
711         if (ret < 0)
712                 return(-1);
713         s->init_off+=ret;
714         s->init_num-=ret;
715         return(0);
716         }
717
718 static int ssl_mt_error(int n)
719         {
720         int ret;
721
722         switch (n)
723                 {
724         case SSL2_PE_NO_CIPHER:
725                 ret=SSL_R_PEER_ERROR_NO_CIPHER;
726                 break;
727         case SSL2_PE_NO_CERTIFICATE:
728                 ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
729                 break;
730         case SSL2_PE_BAD_CERTIFICATE:
731                 ret=SSL_R_PEER_ERROR_CERTIFICATE;
732                 break;
733         case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
734                 ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
735                 break;
736         default:
737                 ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
738                 break;
739                 }
740         return(ret);
741         }
742 #else /* !OPENSSL_NO_SSL2 */
743
744 # if PEDANTIC
745 static void *dummy=&dummy;
746 # endif
747
748 #endif