Import OpenSSL 0.9.8l
[dragonfly.git] / crypto / openssl / ssl / s3_pkt.c
1 /* ssl/s3_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) 1998-2002 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 <stdio.h>
113 #include <errno.h>
114 #define USE_SOCKETS
115 #include "ssl_locl.h"
116 #include <openssl/evp.h>
117 #include <openssl/buffer.h>
118
119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
120                          unsigned int len, int create_empty_fragment);
121 static int ssl3_get_record(SSL *s);
122
123 int ssl3_read_n(SSL *s, int n, int max, int extend)
124         {
125         /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
126          * packet by another n bytes.
127          * The packet will be in the sub-array of s->s3->rbuf.buf specified
128          * by s->packet and s->packet_length.
129          * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
130          * [plus s->packet_length bytes if extend == 1].)
131          */
132         int i,off,newb;
133
134         if (!extend)
135                 {
136                 /* start with empty packet ... */
137                 if (s->s3->rbuf.left == 0)
138                         s->s3->rbuf.offset = 0;
139                 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
140                 s->packet_length = 0;
141                 /* ... now we can act as if 'extend' was set */
142                 }
143
144         /* extend reads should not span multiple packets for DTLS */
145         if ( SSL_version(s) == DTLS1_VERSION &&
146                 extend)
147                 {
148                 if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left)
149                         n = s->s3->rbuf.left;
150                 }
151
152         /* if there is enough in the buffer from a previous read, take some */
153         if (s->s3->rbuf.left >= (int)n)
154                 {
155                 s->packet_length+=n;
156                 s->s3->rbuf.left-=n;
157                 s->s3->rbuf.offset+=n;
158                 return(n);
159                 }
160
161         /* else we need to read more data */
162         if (!s->read_ahead)
163                 max=n;
164
165         {
166                 /* avoid buffer overflow */
167                 int max_max = s->s3->rbuf.len - s->packet_length;
168                 if (max > max_max)
169                         max = max_max;
170         }
171         if (n > max) /* does not happen */
172                 {
173                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
174                 return -1;
175                 }
176
177         off = s->packet_length;
178         newb = s->s3->rbuf.left;
179         /* Move any available bytes to front of buffer:
180          * 'off' bytes already pointed to by 'packet',
181          * 'newb' extra ones at the end */
182         if (s->packet != s->s3->rbuf.buf)
183                 {
184                 /*  off > 0 */
185                 memmove(s->s3->rbuf.buf, s->packet, off+newb);
186                 s->packet = s->s3->rbuf.buf;
187                 }
188
189         while (newb < n)
190                 {
191                 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
192                  * to read in more until we have off+n (up to off+max if possible) */
193
194                 clear_sys_error();
195                 if (s->rbio != NULL)
196                         {
197                         s->rwstate=SSL_READING;
198                         i=BIO_read(s->rbio,     &(s->s3->rbuf.buf[off+newb]), max-newb);
199                         }
200                 else
201                         {
202                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
203                         i = -1;
204                         }
205
206                 if (i <= 0)
207                         {
208                         s->s3->rbuf.left = newb;
209                         return(i);
210                         }
211                 newb+=i;
212                 }
213
214         /* done reading, now the book-keeping */
215         s->s3->rbuf.offset = off + n;
216         s->s3->rbuf.left = newb - n;
217         s->packet_length += n;
218         s->rwstate=SSL_NOTHING;
219         return(n);
220         }
221
222 /* Call this to get a new input record.
223  * It will return <= 0 if more data is needed, normally due to an error
224  * or non-blocking IO.
225  * When it finishes, one packet has been decoded and can be found in
226  * ssl->s3->rrec.type    - is the type of record
227  * ssl->s3->rrec.data,   - data
228  * ssl->s3->rrec.length, - number of bytes
229  */
230 /* used only by ssl3_read_bytes */
231 static int ssl3_get_record(SSL *s)
232         {
233         int ssl_major,ssl_minor,al;
234         int enc_err,n,i,ret= -1;
235         SSL3_RECORD *rr;
236         SSL_SESSION *sess;
237         unsigned char *p;
238         unsigned char md[EVP_MAX_MD_SIZE];
239         short version;
240         unsigned int mac_size;
241         int clear=0;
242         size_t extra;
243         int decryption_failed_or_bad_record_mac = 0;
244         unsigned char *mac = NULL;
245
246         rr= &(s->s3->rrec);
247         sess=s->session;
248
249         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
250                 extra=SSL3_RT_MAX_EXTRA;
251         else
252                 extra=0;
253         if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE)
254                 {
255                 /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
256                  * set after ssl3_setup_buffers() was done */
257                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
258                 return -1;
259                 }
260
261 again:
262         /* check if we have the header */
263         if (    (s->rstate != SSL_ST_READ_BODY) ||
264                 (s->packet_length < SSL3_RT_HEADER_LENGTH)) 
265                 {
266                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
267                 if (n <= 0) return(n); /* error or non-blocking */
268                 s->rstate=SSL_ST_READ_BODY;
269
270                 p=s->packet;
271
272                 /* Pull apart the header into the SSL3_RECORD */
273                 rr->type= *(p++);
274                 ssl_major= *(p++);
275                 ssl_minor= *(p++);
276                 version=(ssl_major<<8)|ssl_minor;
277                 n2s(p,rr->length);
278
279                 /* Lets check version */
280                 if (!s->first_packet)
281                         {
282                         if (version != s->version)
283                                 {
284                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
285                                 /* Send back error using their
286                                  * version number :-) */
287                                 s->version=version;
288                                 al=SSL_AD_PROTOCOL_VERSION;
289                                 goto f_err;
290                                 }
291                         }
292
293                 if ((version>>8) != SSL3_VERSION_MAJOR)
294                         {
295                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
296                         goto err;
297                         }
298
299                 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
300                         {
301                         al=SSL_AD_RECORD_OVERFLOW;
302                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
303                         goto f_err;
304                         }
305
306                 /* now s->rstate == SSL_ST_READ_BODY */
307                 }
308
309         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
310
311         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
312                 {
313                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
314                 i=rr->length;
315                 n=ssl3_read_n(s,i,i,1);
316                 if (n <= 0) return(n); /* error or non-blocking io */
317                 /* now n == rr->length,
318                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
319                 }
320
321         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
322
323         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
324          * and we have that many bytes in s->packet
325          */
326         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
327
328         /* ok, we can now read from 's->packet' data into 'rr'
329          * rr->input points at rr->length bytes, which
330          * need to be copied into rr->data by either
331          * the decryption or by the decompression
332          * When the data is 'copied' into the rr->data buffer,
333          * rr->input will be pointed at the new buffer */ 
334
335         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
336          * rr->length bytes of encrypted compressed stuff. */
337
338         /* check is not needed I believe */
339         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
340                 {
341                 al=SSL_AD_RECORD_OVERFLOW;
342                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
343                 goto f_err;
344                 }
345
346         /* decrypt in place in 'rr->input' */
347         rr->data=rr->input;
348
349         enc_err = s->method->ssl3_enc->enc(s,0);
350         if (enc_err <= 0)
351                 {
352                 if (enc_err == 0)
353                         /* SSLerr() and ssl3_send_alert() have been called */
354                         goto err;
355
356                 /* Otherwise enc_err == -1, which indicates bad padding
357                  * (rec->length has not been changed in this case).
358                  * To minimize information leaked via timing, we will perform
359                  * the MAC computation anyway. */
360                 decryption_failed_or_bad_record_mac = 1;
361                 }
362
363 #ifdef TLS_DEBUG
364 printf("dec %d\n",rr->length);
365 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
366 printf("\n");
367 #endif
368
369         /* r->length is now the compressed data plus mac */
370         if (    (sess == NULL) ||
371                 (s->enc_read_ctx == NULL) ||
372                 (s->read_hash == NULL))
373                 clear=1;
374
375         if (!clear)
376                 {
377                 mac_size=EVP_MD_size(s->read_hash);
378
379                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
380                         {
381 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
382                         al=SSL_AD_RECORD_OVERFLOW;
383                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
384                         goto f_err;
385 #else
386                         decryption_failed_or_bad_record_mac = 1;
387 #endif                  
388                         }
389                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
390                 if (rr->length >= mac_size)
391                         {
392                         rr->length -= mac_size;
393                         mac = &rr->data[rr->length];
394                         }
395                 else
396                         {
397                         /* record (minus padding) is too short to contain a MAC */
398 #if 0 /* OK only for stream ciphers */
399                         al=SSL_AD_DECODE_ERROR;
400                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
401                         goto f_err;
402 #else
403                         decryption_failed_or_bad_record_mac = 1;
404                         rr->length = 0;
405 #endif
406                         }
407                 i=s->method->ssl3_enc->mac(s,md,0);
408                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
409                         {
410                         decryption_failed_or_bad_record_mac = 1;
411                         }
412                 }
413
414         if (decryption_failed_or_bad_record_mac)
415                 {
416                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
417                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
418                  * failure is directly visible from the ciphertext anyway,
419                  * we should not reveal which kind of error occured -- this
420                  * might become visible to an attacker (e.g. via a logfile) */
421                 al=SSL_AD_BAD_RECORD_MAC;
422                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
423                 goto f_err;
424                 }
425
426         /* r->length is now just compressed */
427         if (s->expand != NULL)
428                 {
429                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
430                         {
431                         al=SSL_AD_RECORD_OVERFLOW;
432                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
433                         goto f_err;
434                         }
435                 if (!ssl3_do_uncompress(s))
436                         {
437                         al=SSL_AD_DECOMPRESSION_FAILURE;
438                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
439                         goto f_err;
440                         }
441                 }
442
443         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
444                 {
445                 al=SSL_AD_RECORD_OVERFLOW;
446                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
447                 goto f_err;
448                 }
449
450         rr->off=0;
451         /* So at this point the following is true
452          * ssl->s3->rrec.type   is the type of record
453          * ssl->s3->rrec.length == number of bytes in record
454          * ssl->s3->rrec.off    == offset to first valid byte
455          * ssl->s3->rrec.data   == where to take bytes from, increment
456          *                         after use :-).
457          */
458
459         /* we have pulled in a full packet so zero things */
460         s->packet_length=0;
461
462         /* just read a 0 length packet */
463         if (rr->length == 0) goto again;
464
465         return(1);
466
467 f_err:
468         ssl3_send_alert(s,SSL3_AL_FATAL,al);
469 err:
470         return(ret);
471         }
472
473 int ssl3_do_uncompress(SSL *ssl)
474         {
475 #ifndef OPENSSL_NO_COMP
476         int i;
477         SSL3_RECORD *rr;
478
479         rr= &(ssl->s3->rrec);
480         i=COMP_expand_block(ssl->expand,rr->comp,
481                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
482         if (i < 0)
483                 return(0);
484         else
485                 rr->length=i;
486         rr->data=rr->comp;
487 #endif
488         return(1);
489         }
490
491 int ssl3_do_compress(SSL *ssl)
492         {
493 #ifndef OPENSSL_NO_COMP
494         int i;
495         SSL3_RECORD *wr;
496
497         wr= &(ssl->s3->wrec);
498         i=COMP_compress_block(ssl->compress,wr->data,
499                 SSL3_RT_MAX_COMPRESSED_LENGTH,
500                 wr->input,(int)wr->length);
501         if (i < 0)
502                 return(0);
503         else
504                 wr->length=i;
505
506         wr->input=wr->data;
507 #endif
508         return(1);
509         }
510
511 /* Call this to write data in records of type 'type'
512  * It will return <= 0 if not all data has been sent or non-blocking IO.
513  */
514 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
515         {
516         const unsigned char *buf=buf_;
517         unsigned int tot,n,nw;
518         int i;
519
520         s->rwstate=SSL_NOTHING;
521         tot=s->s3->wnum;
522         s->s3->wnum=0;
523
524         if (SSL_in_init(s) && !s->in_handshake)
525                 {
526                 i=s->handshake_func(s);
527                 if (i < 0) return(i);
528                 if (i == 0)
529                         {
530                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
531                         return -1;
532                         }
533                 }
534
535         n=(len-tot);
536         for (;;)
537                 {
538                 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
539                         nw=SSL3_RT_MAX_PLAIN_LENGTH;
540                 else
541                         nw=n;
542
543                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
544                 if (i <= 0)
545                         {
546                         s->s3->wnum=tot;
547                         return i;
548                         }
549
550                 if ((i == (int)n) ||
551                         (type == SSL3_RT_APPLICATION_DATA &&
552                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
553                         {
554                         /* next chunk of data should get another prepended empty fragment
555                          * in ciphersuites with known-IV weakness: */
556                         s->s3->empty_fragment_done = 0;
557                         
558                         return tot+i;
559                         }
560
561                 n-=i;
562                 tot+=i;
563                 }
564         }
565
566 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
567                          unsigned int len, int create_empty_fragment)
568         {
569         unsigned char *p,*plen;
570         int i,mac_size,clear=0;
571         int prefix_len = 0;
572         SSL3_RECORD *wr;
573         SSL3_BUFFER *wb;
574         SSL_SESSION *sess;
575
576         /* first check if there is a SSL3_BUFFER still being written
577          * out.  This will happen with non blocking IO */
578         if (s->s3->wbuf.left != 0)
579                 return(ssl3_write_pending(s,type,buf,len));
580
581         /* If we have an alert to send, lets send it */
582         if (s->s3->alert_dispatch)
583                 {
584                 i=s->method->ssl_dispatch_alert(s);
585                 if (i <= 0)
586                         return(i);
587                 /* if it went, fall through and send more stuff */
588                 }
589
590         if (len == 0 && !create_empty_fragment)
591                 return 0;
592
593         wr= &(s->s3->wrec);
594         wb= &(s->s3->wbuf);
595         sess=s->session;
596
597         if (    (sess == NULL) ||
598                 (s->enc_write_ctx == NULL) ||
599                 (s->write_hash == NULL))
600                 clear=1;
601
602         if (clear)
603                 mac_size=0;
604         else
605                 mac_size=EVP_MD_size(s->write_hash);
606
607         /* 'create_empty_fragment' is true only when this function calls itself */
608         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
609                 {
610                 /* countermeasure against known-IV weakness in CBC ciphersuites
611                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
612
613                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
614                         {
615                         /* recursive function call with 'create_empty_fragment' set;
616                          * this prepares and buffers the data for an empty fragment
617                          * (these 'prefix_len' bytes are sent out later
618                          * together with the actual payload) */
619                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
620                         if (prefix_len <= 0)
621                                 goto err;
622
623                         if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
624                                 {
625                                 /* insufficient space */
626                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
627                                 goto err;
628                                 }
629                         }
630                 
631                 s->s3->empty_fragment_done = 1;
632                 }
633
634         p = wb->buf + prefix_len;
635
636         /* write the header */
637
638         *(p++)=type&0xff;
639         wr->type=type;
640
641         *(p++)=(s->version>>8);
642         *(p++)=s->version&0xff;
643
644         /* field where we are to write out packet length */
645         plen=p; 
646         p+=2;
647
648         /* lets setup the record stuff. */
649         wr->data=p;
650         wr->length=(int)len;
651         wr->input=(unsigned char *)buf;
652
653         /* we now 'read' from wr->input, wr->length bytes into
654          * wr->data */
655
656         /* first we compress */
657         if (s->compress != NULL)
658                 {
659                 if (!ssl3_do_compress(s))
660                         {
661                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
662                         goto err;
663                         }
664                 }
665         else
666                 {
667                 memcpy(wr->data,wr->input,wr->length);
668                 wr->input=wr->data;
669                 }
670
671         /* we should still have the output to wr->data and the input
672          * from wr->input.  Length should be wr->length.
673          * wr->data still points in the wb->buf */
674
675         if (mac_size != 0)
676                 {
677                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
678                 wr->length+=mac_size;
679                 wr->input=p;
680                 wr->data=p;
681                 }
682
683         /* ssl3_enc can only have an error on read */
684         s->method->ssl3_enc->enc(s,1);
685
686         /* record length after mac and block padding */
687         s2n(wr->length,plen);
688
689         /* we should now have
690          * wr->data pointing to the encrypted data, which is
691          * wr->length long */
692         wr->type=type; /* not needed but helps for debugging */
693         wr->length+=SSL3_RT_HEADER_LENGTH;
694
695         if (create_empty_fragment)
696                 {
697                 /* we are in a recursive call;
698                  * just return the length, don't write out anything here
699                  */
700                 return wr->length;
701                 }
702
703         /* now let's set up wb */
704         wb->left = prefix_len + wr->length;
705         wb->offset = 0;
706
707         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
708         s->s3->wpend_tot=len;
709         s->s3->wpend_buf=buf;
710         s->s3->wpend_type=type;
711         s->s3->wpend_ret=len;
712
713         /* we now just need to write the buffer */
714         return ssl3_write_pending(s,type,buf,len);
715 err:
716         return -1;
717         }
718
719 /* if s->s3->wbuf.left != 0, we need to call this */
720 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
721         unsigned int len)
722         {
723         int i;
724
725 /* XXXX */
726         if ((s->s3->wpend_tot > (int)len)
727                 || ((s->s3->wpend_buf != buf) &&
728                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
729                 || (s->s3->wpend_type != type))
730                 {
731                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
732                 return(-1);
733                 }
734
735         for (;;)
736                 {
737                 clear_sys_error();
738                 if (s->wbio != NULL)
739                         {
740                         s->rwstate=SSL_WRITING;
741                         i=BIO_write(s->wbio,
742                                 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
743                                 (unsigned int)s->s3->wbuf.left);
744                         }
745                 else
746                         {
747                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
748                         i= -1;
749                         }
750                 if (i == s->s3->wbuf.left)
751                         {
752                         s->s3->wbuf.left=0;
753                         s->rwstate=SSL_NOTHING;
754                         return(s->s3->wpend_ret);
755                         }
756                 else if (i <= 0) {
757                         if (s->version == DTLS1_VERSION ||
758                             s->version == DTLS1_BAD_VER) {
759                                 /* For DTLS, just drop it. That's kind of the whole
760                                    point in using a datagram service */
761                                 s->s3->wbuf.left = 0;
762                         }
763                         return(i);
764                 }
765                 s->s3->wbuf.offset+=i;
766                 s->s3->wbuf.left-=i;
767                 }
768         }
769
770 /* Return up to 'len' payload bytes received in 'type' records.
771  * 'type' is one of the following:
772  *
773  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
774  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
775  *   -  0 (during a shutdown, no data has to be returned)
776  *
777  * If we don't have stored data to work from, read a SSL/TLS record first
778  * (possibly multiple records if we still don't have anything to return).
779  *
780  * This function must handle any surprises the peer may have for us, such as
781  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
782  * a surprise, but handled as if it were), or renegotiation requests.
783  * Also if record payloads contain fragments too small to process, we store
784  * them until there is enough for the respective protocol (the record protocol
785  * may use arbitrary fragmentation and even interleaving):
786  *     Change cipher spec protocol
787  *             just 1 byte needed, no need for keeping anything stored
788  *     Alert protocol
789  *             2 bytes needed (AlertLevel, AlertDescription)
790  *     Handshake protocol
791  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
792  *             to detect unexpected Client Hello and Hello Request messages
793  *             here, anything else is handled by higher layers
794  *     Application data protocol
795  *             none of our business
796  */
797 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
798         {
799         int al,i,j,ret;
800         unsigned int n;
801         SSL3_RECORD *rr;
802         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
803
804         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
805                 if (!ssl3_setup_buffers(s))
806                         return(-1);
807
808         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
809             (peek && (type != SSL3_RT_APPLICATION_DATA)))
810                 {
811                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
812                 return -1;
813                 }
814
815         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
816                 /* (partially) satisfy request from storage */
817                 {
818                 unsigned char *src = s->s3->handshake_fragment;
819                 unsigned char *dst = buf;
820                 unsigned int k;
821
822                 /* peek == 0 */
823                 n = 0;
824                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
825                         {
826                         *dst++ = *src++;
827                         len--; s->s3->handshake_fragment_len--;
828                         n++;
829                         }
830                 /* move any remaining fragment bytes: */
831                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
832                         s->s3->handshake_fragment[k] = *src++;
833                 return n;
834         }
835
836         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
837
838         if (!s->in_handshake && SSL_in_init(s))
839                 {
840                 /* type == SSL3_RT_APPLICATION_DATA */
841                 i=s->handshake_func(s);
842                 if (i < 0) return(i);
843                 if (i == 0)
844                         {
845                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
846                         return(-1);
847                         }
848                 }
849 start:
850         s->rwstate=SSL_NOTHING;
851
852         /* s->s3->rrec.type         - is the type of record
853          * s->s3->rrec.data,    - data
854          * s->s3->rrec.off,     - offset into 'data' for next read
855          * s->s3->rrec.length,  - number of bytes. */
856         rr = &(s->s3->rrec);
857
858         /* get new packet if necessary */
859         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
860                 {
861                 ret=ssl3_get_record(s);
862                 if (ret <= 0) return(ret);
863                 }
864
865         /* we now have a packet which can be read and processed */
866
867         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
868                                        * reset by ssl3_get_finished */
869                 && (rr->type != SSL3_RT_HANDSHAKE))
870                 {
871                 al=SSL_AD_UNEXPECTED_MESSAGE;
872                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
873                 goto f_err;
874                 }
875
876         /* If the other end has shut down, throw anything we read away
877          * (even in 'peek' mode) */
878         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
879                 {
880                 rr->length=0;
881                 s->rwstate=SSL_NOTHING;
882                 return(0);
883                 }
884
885
886         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
887                 {
888                 /* make sure that we are not getting application data when we
889                  * are doing a handshake for the first time */
890                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
891                         (s->enc_read_ctx == NULL))
892                         {
893                         al=SSL_AD_UNEXPECTED_MESSAGE;
894                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
895                         goto f_err;
896                         }
897
898                 if (len <= 0) return(len);
899
900                 if ((unsigned int)len > rr->length)
901                         n = rr->length;
902                 else
903                         n = (unsigned int)len;
904
905                 memcpy(buf,&(rr->data[rr->off]),n);
906                 if (!peek)
907                         {
908                         rr->length-=n;
909                         rr->off+=n;
910                         if (rr->length == 0)
911                                 {
912                                 s->rstate=SSL_ST_READ_HEADER;
913                                 rr->off=0;
914                                 }
915                         }
916                 return(n);
917                 }
918
919
920         /* If we get here, then type != rr->type; if we have a handshake
921          * message, then it was unexpected (Hello Request or Client Hello). */
922
923         /* In case of record types for which we have 'fragment' storage,
924          * fill that so that we can process the data at a fixed place.
925          */
926                 {
927                 unsigned int dest_maxlen = 0;
928                 unsigned char *dest = NULL;
929                 unsigned int *dest_len = NULL;
930
931                 if (rr->type == SSL3_RT_HANDSHAKE)
932                         {
933                         dest_maxlen = sizeof s->s3->handshake_fragment;
934                         dest = s->s3->handshake_fragment;
935                         dest_len = &s->s3->handshake_fragment_len;
936                         }
937                 else if (rr->type == SSL3_RT_ALERT)
938                         {
939                         dest_maxlen = sizeof s->s3->alert_fragment;
940                         dest = s->s3->alert_fragment;
941                         dest_len = &s->s3->alert_fragment_len;
942                         }
943
944                 if (dest_maxlen > 0)
945                         {
946                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
947                         if (rr->length < n)
948                                 n = rr->length; /* available bytes */
949
950                         /* now move 'n' bytes: */
951                         while (n-- > 0)
952                                 {
953                                 dest[(*dest_len)++] = rr->data[rr->off++];
954                                 rr->length--;
955                                 }
956
957                         if (*dest_len < dest_maxlen)
958                                 goto start; /* fragment was too small */
959                         }
960                 }
961
962         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
963          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
964          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
965
966         /* If we are a client, check for an incoming 'Hello Request': */
967         if ((!s->server) &&
968                 (s->s3->handshake_fragment_len >= 4) &&
969                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
970                 (s->session != NULL) && (s->session->cipher != NULL))
971                 {
972                 s->s3->handshake_fragment_len = 0;
973
974                 if ((s->s3->handshake_fragment[1] != 0) ||
975                         (s->s3->handshake_fragment[2] != 0) ||
976                         (s->s3->handshake_fragment[3] != 0))
977                         {
978                         al=SSL_AD_DECODE_ERROR;
979                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
980                         goto f_err;
981                         }
982
983                 if (s->msg_callback)
984                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
985
986                 if (SSL_is_init_finished(s) &&
987                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
988                         (s->s3->flags & SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) &&
989                         !s->s3->renegotiate)
990                         {
991                         ssl3_renegotiate(s);
992                         if (ssl3_renegotiate_check(s))
993                                 {
994                                 i=s->handshake_func(s);
995                                 if (i < 0) return(i);
996                                 if (i == 0)
997                                         {
998                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
999                                         return(-1);
1000                                         }
1001
1002                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1003                                         {
1004                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1005                                                 {
1006                                                 BIO *bio;
1007                                                 /* In the case where we try to read application data,
1008                                                  * but we trigger an SSL handshake, we return -1 with
1009                                                  * the retry option set.  Otherwise renegotiation may
1010                                                  * cause nasty problems in the blocking world */
1011                                                 s->rwstate=SSL_READING;
1012                                                 bio=SSL_get_rbio(s);
1013                                                 BIO_clear_retry_flags(bio);
1014                                                 BIO_set_retry_read(bio);
1015                                                 return(-1);
1016                                                 }
1017                                         }
1018                                 }
1019                         }
1020                 /* we either finished a handshake or ignored the request,
1021                  * now try again to obtain the (application) data we were asked for */
1022                 goto start;
1023                 }
1024
1025         if (s->s3->alert_fragment_len >= 2)
1026                 {
1027                 int alert_level = s->s3->alert_fragment[0];
1028                 int alert_descr = s->s3->alert_fragment[1];
1029
1030                 s->s3->alert_fragment_len = 0;
1031
1032                 if (s->msg_callback)
1033                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1034
1035                 if (s->info_callback != NULL)
1036                         cb=s->info_callback;
1037                 else if (s->ctx->info_callback != NULL)
1038                         cb=s->ctx->info_callback;
1039
1040                 if (cb != NULL)
1041                         {
1042                         j = (alert_level << 8) | alert_descr;
1043                         cb(s, SSL_CB_READ_ALERT, j);
1044                         }
1045
1046                 if (alert_level == 1) /* warning */
1047                         {
1048                         s->s3->warn_alert = alert_descr;
1049                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1050                                 {
1051                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1052                                 return(0);
1053                                 }
1054                         }
1055                 else if (alert_level == 2) /* fatal */
1056                         {
1057                         char tmp[16];
1058
1059                         s->rwstate=SSL_NOTHING;
1060                         s->s3->fatal_alert = alert_descr;
1061                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1062                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1063                         ERR_add_error_data(2,"SSL alert number ",tmp);
1064                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1065                         SSL_CTX_remove_session(s->ctx,s->session);
1066                         return(0);
1067                         }
1068                 else
1069                         {
1070                         al=SSL_AD_ILLEGAL_PARAMETER;
1071                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1072                         goto f_err;
1073                         }
1074
1075                 goto start;
1076                 }
1077
1078         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1079                 {
1080                 s->rwstate=SSL_NOTHING;
1081                 rr->length=0;
1082                 return(0);
1083                 }
1084
1085         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1086                 {
1087                 /* 'Change Cipher Spec' is just a single byte, so we know
1088                  * exactly what the record payload has to look like */
1089                 if (    (rr->length != 1) || (rr->off != 0) ||
1090                         (rr->data[0] != SSL3_MT_CCS))
1091                         {
1092                         al=SSL_AD_ILLEGAL_PARAMETER;
1093                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1094                         goto f_err;
1095                         }
1096
1097                 /* Check we have a cipher to change to */
1098                 if (s->s3->tmp.new_cipher == NULL)
1099                         {
1100                         al=SSL_AD_UNEXPECTED_MESSAGE;
1101                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1102                         goto f_err;
1103                         }
1104
1105                 rr->length=0;
1106
1107                 if (s->msg_callback)
1108                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1109
1110                 s->s3->change_cipher_spec=1;
1111                 if (!ssl3_do_change_cipher_spec(s))
1112                         goto err;
1113                 else
1114                         goto start;
1115                 }
1116
1117         /* Unexpected handshake message (Client Hello, or protocol violation) */
1118         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1119                 {
1120                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1121                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1122                         (s->s3->flags & SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1123                         {
1124 #if 0 /* worked only because C operator preferences are not as expected (and
1125        * because this is not really needed for clients except for detecting
1126        * protocol violations): */
1127                         s->state=SSL_ST_BEFORE|(s->server)
1128                                 ?SSL_ST_ACCEPT
1129                                 :SSL_ST_CONNECT;
1130 #else
1131                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1132 #endif
1133                         s->new_session=1;
1134                         }
1135                 i=s->handshake_func(s);
1136                 if (i < 0) return(i);
1137                 if (i == 0)
1138                         {
1139                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1140                         return(-1);
1141                         }
1142
1143                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1144                         {
1145                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1146                                 {
1147                                 BIO *bio;
1148                                 /* In the case where we try to read application data,
1149                                  * but we trigger an SSL handshake, we return -1 with
1150                                  * the retry option set.  Otherwise renegotiation may
1151                                  * cause nasty problems in the blocking world */
1152                                 s->rwstate=SSL_READING;
1153                                 bio=SSL_get_rbio(s);
1154                                 BIO_clear_retry_flags(bio);
1155                                 BIO_set_retry_read(bio);
1156                                 return(-1);
1157                                 }
1158                         }
1159                 goto start;
1160                 }
1161
1162         switch (rr->type)
1163                 {
1164         default:
1165 #ifndef OPENSSL_NO_TLS
1166                 /* TLS just ignores unknown message types */
1167                 if (s->version == TLS1_VERSION)
1168                         {
1169                         rr->length = 0;
1170                         goto start;
1171                         }
1172 #endif
1173                 al=SSL_AD_UNEXPECTED_MESSAGE;
1174                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1175                 goto f_err;
1176         case SSL3_RT_CHANGE_CIPHER_SPEC:
1177         case SSL3_RT_ALERT:
1178         case SSL3_RT_HANDSHAKE:
1179                 /* we already handled all of these, with the possible exception
1180                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1181                  * should not happen when type != rr->type */
1182                 al=SSL_AD_UNEXPECTED_MESSAGE;
1183                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1184                 goto f_err;
1185         case SSL3_RT_APPLICATION_DATA:
1186                 /* At this point, we were expecting handshake data,
1187                  * but have application data.  If the library was
1188                  * running inside ssl3_read() (i.e. in_read_app_data
1189                  * is set) and it makes sense to read application data
1190                  * at this point (session renegotiation not yet started),
1191                  * we will indulge it.
1192                  */
1193                 if (s->s3->in_read_app_data &&
1194                         (s->s3->total_renegotiations != 0) &&
1195                         ((
1196                                 (s->state & SSL_ST_CONNECT) &&
1197                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1198                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1199                                 ) || (
1200                                         (s->state & SSL_ST_ACCEPT) &&
1201                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1202                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1203                                         )
1204                                 ))
1205                         {
1206                         s->s3->in_read_app_data=2;
1207                         return(-1);
1208                         }
1209                 else
1210                         {
1211                         al=SSL_AD_UNEXPECTED_MESSAGE;
1212                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1213                         goto f_err;
1214                         }
1215                 }
1216         /* not reached */
1217
1218 f_err:
1219         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1220 err:
1221         return(-1);
1222         }
1223
1224 int ssl3_do_change_cipher_spec(SSL *s)
1225         {
1226         int i;
1227         const char *sender;
1228         int slen;
1229
1230         if (s->state & SSL_ST_ACCEPT)
1231                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1232         else
1233                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1234
1235         if (s->s3->tmp.key_block == NULL)
1236                 {
1237                 if (s->session == NULL) 
1238                         {
1239                         /* might happen if dtls1_read_bytes() calls this */
1240                         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1241                         return (0);
1242                         }
1243
1244                 s->session->cipher=s->s3->tmp.new_cipher;
1245                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1246                 }
1247
1248         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1249                 return(0);
1250
1251         /* we have to record the message digest at
1252          * this point so we can get it before we read
1253          * the finished message */
1254         if (s->state & SSL_ST_CONNECT)
1255                 {
1256                 sender=s->method->ssl3_enc->server_finished_label;
1257                 slen=s->method->ssl3_enc->server_finished_label_len;
1258                 }
1259         else
1260                 {
1261                 sender=s->method->ssl3_enc->client_finished_label;
1262                 slen=s->method->ssl3_enc->client_finished_label_len;
1263                 }
1264
1265         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1266                 &(s->s3->finish_dgst1),
1267                 &(s->s3->finish_dgst2),
1268                 sender,slen,s->s3->tmp.peer_finish_md);
1269
1270         return(1);
1271         }
1272
1273 void ssl3_send_alert(SSL *s, int level, int desc)
1274         {
1275         /* Map tls/ssl alert value to correct one */
1276         desc=s->method->ssl3_enc->alert_value(desc);
1277         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1278                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1279         if (desc < 0) return;
1280         /* If a fatal one, remove from cache */
1281         if ((level == 2) && (s->session != NULL))
1282                 SSL_CTX_remove_session(s->ctx,s->session);
1283
1284         s->s3->alert_dispatch=1;
1285         s->s3->send_alert[0]=level;
1286         s->s3->send_alert[1]=desc;
1287         if (s->s3->wbuf.left == 0) /* data still being written out? */
1288                 s->method->ssl_dispatch_alert(s);
1289         /* else data is still being written out, we will get written
1290          * some time in the future */
1291         }
1292
1293 int ssl3_dispatch_alert(SSL *s)
1294         {
1295         int i,j;
1296         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1297
1298         s->s3->alert_dispatch=0;
1299         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1300         if (i <= 0)
1301                 {
1302                 s->s3->alert_dispatch=1;
1303                 }
1304         else
1305                 {
1306                 /* Alert sent to BIO.  If it is important, flush it now.
1307                  * If the message does not get sent due to non-blocking IO,
1308                  * we will not worry too much. */
1309                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1310                         (void)BIO_flush(s->wbio);
1311
1312                 if (s->msg_callback)
1313                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1314
1315                 if (s->info_callback != NULL)
1316                         cb=s->info_callback;
1317                 else if (s->ctx->info_callback != NULL)
1318                         cb=s->ctx->info_callback;
1319
1320                 if (cb != NULL)
1321                         {
1322                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1323                         cb(s,SSL_CB_WRITE_ALERT,j);
1324                         }
1325                 }
1326         return(i);
1327         }