fix incorrect strength bit values for certain Kerberos ciphersuites
[openssl.git] / 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,len,left,align=0;
133         unsigned char *pkt;
134         SSL3_BUFFER *rb;
135
136         if (n <= 0) return n;
137
138         rb    = &(s->s3->rbuf);
139         left  = rb->left;
140 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
141         align = (int)rb->buf + SSL3_RT_HEADER_LENGTH;
142         align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
143 #endif
144
145         if (!extend)
146                 {
147                 /* start with empty packet ... */
148                 if (left == 0)
149                         rb->offset = align;
150                 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
151                         {
152                         /* check if next packet length is large
153                          * enough to justify payload alignment... */
154                         pkt = rb->buf + rb->offset;
155                         if (pkt[0] == SSL3_RT_APPLICATION_DATA
156                             && (pkt[3]<<8|pkt[4]) >= 128)
157                                 {
158                                 /* Note that even if packet is corrupted
159                                  * and its length field is insane, we can
160                                  * only be led to wrong decision about
161                                  * whether memmove will occur or not.
162                                  * Header values has no effect on memmove
163                                  * arguments and therefore no buffer
164                                  * overrun can be triggered. */
165                                 memmove (rb->buf+align,pkt,left);
166                                 rb->offset = align;
167                                 }
168                         }
169                 s->packet = rb->buf + rb->offset;
170                 s->packet_length = 0;
171                 /* ... now we can act as if 'extend' was set */
172                 }
173
174         /* extend reads should not span multiple packets for DTLS */
175         if ( SSL_version(s) == DTLS1_VERSION &&
176                 extend)
177                 {
178                 if ( left > 0 && n > left)
179                         n = left;
180                 }
181
182         /* if there is enough in the buffer from a previous read, take some */
183         if (left >= n)
184                 {
185                 s->packet_length+=n;
186                 rb->left=left-n;
187                 rb->offset+=n;
188                 return(n);
189                 }
190
191         /* else we need to read more data */
192
193         len = s->packet_length;
194         pkt = rb->buf+align;
195         /* Move any available bytes to front of buffer:
196          * 'len' bytes already pointed to by 'packet',
197          * 'left' extra ones at the end */
198         if (s->packet != pkt) /* len > 0 */
199                 {
200                 memmove(pkt, s->packet, len+left);
201                 s->packet = pkt;
202                 rb->offset = len + align;
203                 }
204
205         max = rb->len - rb->offset;
206         if (n > max) /* does not happen */
207                 {
208                 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
209                 return -1;
210                 }
211
212         if (!s->read_ahead)
213                 max=n;
214
215         while (left < n)
216                 {
217                 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
218                  * and need to read in more until we have len+n (up to
219                  * len+max if possible) */
220
221                 clear_sys_error();
222                 if (s->rbio != NULL)
223                         {
224                         s->rwstate=SSL_READING;
225                         i=BIO_read(s->rbio,pkt+len+left, max-left);
226                         }
227                 else
228                         {
229                         SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
230                         i = -1;
231                         }
232
233                 if (i <= 0)
234                         {
235                         rb->left = left;
236                         return(i);
237                         }
238                 left+=i;
239                 }
240
241         /* done reading, now the book-keeping */
242         rb->offset += n;
243         rb->left = left - n;
244         s->packet_length += n;
245         s->rwstate=SSL_NOTHING;
246         return(n);
247         }
248
249 /* Call this to get a new input record.
250  * It will return <= 0 if more data is needed, normally due to an error
251  * or non-blocking IO.
252  * When it finishes, one packet has been decoded and can be found in
253  * ssl->s3->rrec.type    - is the type of record
254  * ssl->s3->rrec.data,   - data
255  * ssl->s3->rrec.length, - number of bytes
256  */
257 /* used only by ssl3_read_bytes */
258 static int ssl3_get_record(SSL *s)
259         {
260         int ssl_major,ssl_minor,al;
261         int enc_err,n,i,ret= -1;
262         SSL3_RECORD *rr;
263         SSL_SESSION *sess;
264         unsigned char *p;
265         unsigned char md[EVP_MAX_MD_SIZE];
266         short version;
267         unsigned int mac_size;
268         int clear=0;
269         size_t extra;
270         int decryption_failed_or_bad_record_mac = 0;
271         unsigned char *mac = NULL;
272
273         rr= &(s->s3->rrec);
274         sess=s->session;
275
276         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
277                 extra=SSL3_RT_MAX_EXTRA;
278         else
279                 extra=0;
280         if (extra && !s->s3->init_extra)
281                 {
282                 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
283                  * set after ssl3_setup_buffers() was done */
284                 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
285                 return -1;
286                 }
287
288 again:
289         /* check if we have the header */
290         if (    (s->rstate != SSL_ST_READ_BODY) ||
291                 (s->packet_length < SSL3_RT_HEADER_LENGTH)) 
292                 {
293                 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
294                 if (n <= 0) return(n); /* error or non-blocking */
295                 s->rstate=SSL_ST_READ_BODY;
296
297                 p=s->packet;
298
299                 /* Pull apart the header into the SSL3_RECORD */
300                 rr->type= *(p++);
301                 ssl_major= *(p++);
302                 ssl_minor= *(p++);
303                 version=(ssl_major<<8)|ssl_minor;
304                 n2s(p,rr->length);
305 #if 0
306 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
307 #endif
308
309                 /* Lets check version */
310                 if (!s->first_packet)
311                         {
312                         if (version != s->version)
313                                 {
314                                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
315                                 /* Send back error using their
316                                  * version number :-) */
317                                 s->version=version;
318                                 al=SSL_AD_PROTOCOL_VERSION;
319                                 goto f_err;
320                                 }
321                         }
322
323                 if ((version>>8) != SSL3_VERSION_MAJOR)
324                         {
325                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
326                         goto err;
327                         }
328
329                 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
330                         {
331                         al=SSL_AD_RECORD_OVERFLOW;
332                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
333                         goto f_err;
334                         }
335
336                 /* now s->rstate == SSL_ST_READ_BODY */
337                 }
338
339         /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
340
341         if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
342                 {
343                 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
344                 i=rr->length;
345                 n=ssl3_read_n(s,i,i,1);
346                 if (n <= 0) return(n); /* error or non-blocking io */
347                 /* now n == rr->length,
348                  * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
349                 }
350
351         s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
352
353         /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
354          * and we have that many bytes in s->packet
355          */
356         rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
357
358         /* ok, we can now read from 's->packet' data into 'rr'
359          * rr->input points at rr->length bytes, which
360          * need to be copied into rr->data by either
361          * the decryption or by the decompression
362          * When the data is 'copied' into the rr->data buffer,
363          * rr->input will be pointed at the new buffer */ 
364
365         /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
366          * rr->length bytes of encrypted compressed stuff. */
367
368         /* check is not needed I believe */
369         if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
370                 {
371                 al=SSL_AD_RECORD_OVERFLOW;
372                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
373                 goto f_err;
374                 }
375
376         /* decrypt in place in 'rr->input' */
377         rr->data=rr->input;
378
379         enc_err = s->method->ssl3_enc->enc(s,0);
380         if (enc_err <= 0)
381                 {
382                 if (enc_err == 0)
383                         /* SSLerr() and ssl3_send_alert() have been called */
384                         goto err;
385
386                 /* Otherwise enc_err == -1, which indicates bad padding
387                  * (rec->length has not been changed in this case).
388                  * To minimize information leaked via timing, we will perform
389                  * the MAC computation anyway. */
390                 decryption_failed_or_bad_record_mac = 1;
391                 }
392
393 #ifdef TLS_DEBUG
394 printf("dec %d\n",rr->length);
395 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
396 printf("\n");
397 #endif
398
399         /* r->length is now the compressed data plus mac */
400         if (    (sess == NULL) ||
401                 (s->enc_read_ctx == NULL) ||
402                 (s->read_hash == NULL))
403                 clear=1;
404
405         if (!clear)
406                 {
407                 mac_size=EVP_MD_size(s->read_hash);
408
409                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
410                         {
411 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
412                         al=SSL_AD_RECORD_OVERFLOW;
413                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
414                         goto f_err;
415 #else
416                         decryption_failed_or_bad_record_mac = 1;
417 #endif                  
418                         }
419                 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
420                 if (rr->length >= mac_size)
421                         {
422                         rr->length -= mac_size;
423                         mac = &rr->data[rr->length];
424                         }
425                 else
426                         {
427                         /* record (minus padding) is too short to contain a MAC */
428 #if 0 /* OK only for stream ciphers */
429                         al=SSL_AD_DECODE_ERROR;
430                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
431                         goto f_err;
432 #else
433                         decryption_failed_or_bad_record_mac = 1;
434                         rr->length = 0;
435 #endif
436                         }
437                 i=s->method->ssl3_enc->mac(s,md,0);
438                 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
439                         {
440                         decryption_failed_or_bad_record_mac = 1;
441                         }
442                 }
443
444         if (decryption_failed_or_bad_record_mac)
445                 {
446                 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
447                  * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
448                  * failure is directly visible from the ciphertext anyway,
449                  * we should not reveal which kind of error occured -- this
450                  * might become visible to an attacker (e.g. via a logfile) */
451                 al=SSL_AD_BAD_RECORD_MAC;
452                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
453                 goto f_err;
454                 }
455
456         /* r->length is now just compressed */
457         if (s->expand != NULL)
458                 {
459                 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
460                         {
461                         al=SSL_AD_RECORD_OVERFLOW;
462                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
463                         goto f_err;
464                         }
465                 if (!ssl3_do_uncompress(s))
466                         {
467                         al=SSL_AD_DECOMPRESSION_FAILURE;
468                         SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
469                         goto f_err;
470                         }
471                 }
472
473         if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
474                 {
475                 al=SSL_AD_RECORD_OVERFLOW;
476                 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
477                 goto f_err;
478                 }
479
480         rr->off=0;
481         /* So at this point the following is true
482          * ssl->s3->rrec.type   is the type of record
483          * ssl->s3->rrec.length == number of bytes in record
484          * ssl->s3->rrec.off    == offset to first valid byte
485          * ssl->s3->rrec.data   == where to take bytes from, increment
486          *                         after use :-).
487          */
488
489         /* we have pulled in a full packet so zero things */
490         s->packet_length=0;
491
492         /* just read a 0 length packet */
493         if (rr->length == 0) goto again;
494
495 #if 0
496 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
497 #endif
498
499         return(1);
500
501 f_err:
502         ssl3_send_alert(s,SSL3_AL_FATAL,al);
503 err:
504         return(ret);
505         }
506
507 int ssl3_do_uncompress(SSL *ssl)
508         {
509 #ifndef OPENSSL_NO_COMP
510         int i;
511         SSL3_RECORD *rr;
512
513         rr= &(ssl->s3->rrec);
514         i=COMP_expand_block(ssl->expand,rr->comp,
515                 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
516         if (i < 0)
517                 return(0);
518         else
519                 rr->length=i;
520         rr->data=rr->comp;
521 #endif
522         return(1);
523         }
524
525 int ssl3_do_compress(SSL *ssl)
526         {
527 #ifndef OPENSSL_NO_COMP
528         int i;
529         SSL3_RECORD *wr;
530
531         wr= &(ssl->s3->wrec);
532         i=COMP_compress_block(ssl->compress,wr->data,
533                 SSL3_RT_MAX_COMPRESSED_LENGTH,
534                 wr->input,(int)wr->length);
535         if (i < 0)
536                 return(0);
537         else
538                 wr->length=i;
539
540         wr->input=wr->data;
541 #endif
542         return(1);
543         }
544
545 /* Call this to write data in records of type 'type'
546  * It will return <= 0 if not all data has been sent or non-blocking IO.
547  */
548 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
549         {
550         const unsigned char *buf=buf_;
551         unsigned int tot,n,nw;
552         int i;
553
554         s->rwstate=SSL_NOTHING;
555         tot=s->s3->wnum;
556         s->s3->wnum=0;
557
558         if (SSL_in_init(s) && !s->in_handshake)
559                 {
560                 i=s->handshake_func(s);
561                 if (i < 0) return(i);
562                 if (i == 0)
563                         {
564                         SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
565                         return -1;
566                         }
567                 }
568
569         n=(len-tot);
570         for (;;)
571                 {
572                 if (n > s->max_send_fragment)
573                         nw=s->max_send_fragment;
574                 else
575                         nw=n;
576
577                 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
578                 if (i <= 0)
579                         {
580                         s->s3->wnum=tot;
581                         return i;
582                         }
583
584                 if ((i == (int)n) ||
585                         (type == SSL3_RT_APPLICATION_DATA &&
586                          (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
587                         {
588                         /* next chunk of data should get another prepended empty fragment
589                          * in ciphersuites with known-IV weakness: */
590                         s->s3->empty_fragment_done = 0;
591                         
592                         return tot+i;
593                         }
594
595                 n-=i;
596                 tot+=i;
597                 }
598         }
599
600 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
601                          unsigned int len, int create_empty_fragment)
602         {
603         unsigned char *p,*plen;
604         int i,mac_size,clear=0;
605         int prefix_len=0,align=0;
606         SSL3_RECORD *wr;
607         SSL3_BUFFER *wb=&(s->s3->wbuf);
608         SSL_SESSION *sess;
609
610         /* first check if there is a SSL3_BUFFER still being written
611          * out.  This will happen with non blocking IO */
612         if (wb->left != 0)
613                 return(ssl3_write_pending(s,type,buf,len));
614
615         /* If we have an alert to send, lets send it */
616         if (s->s3->alert_dispatch)
617                 {
618                 i=s->method->ssl_dispatch_alert(s);
619                 if (i <= 0)
620                         return(i);
621                 /* if it went, fall through and send more stuff */
622                 }
623
624         if (len == 0 && !create_empty_fragment)
625                 return 0;
626
627         wr= &(s->s3->wrec);
628         sess=s->session;
629
630         if (    (sess == NULL) ||
631                 (s->enc_write_ctx == NULL) ||
632                 (s->write_hash == NULL))
633                 clear=1;
634
635         if (clear)
636                 mac_size=0;
637         else
638                 mac_size=EVP_MD_size(s->write_hash);
639
640         /* 'create_empty_fragment' is true only when this function calls itself */
641         if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
642                 {
643                 /* countermeasure against known-IV weakness in CBC ciphersuites
644                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
645
646                 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
647                         {
648                         /* recursive function call with 'create_empty_fragment' set;
649                          * this prepares and buffers the data for an empty fragment
650                          * (these 'prefix_len' bytes are sent out later
651                          * together with the actual payload) */
652                         prefix_len = do_ssl3_write(s, type, buf, 0, 1);
653                         if (prefix_len <= 0)
654                                 goto err;
655
656                         if (prefix_len >
657                 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
658                                 {
659                                 /* insufficient space */
660                                 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
661                                 goto err;
662                                 }
663                         }
664                 
665                 s->s3->empty_fragment_done = 1;
666                 }
667
668         if (create_empty_fragment)
669                 {
670 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
671                 /* extra fragment would be couple of cipher blocks,
672                  * which would be multiple of SSL3_ALIGN_PAYLOAD, so
673                  * if we want to align the real payload, then we can
674                  * just pretent we simply have two headers. */
675                 align = (int)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
676                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
677 #endif
678                 p = wb->buf + align;
679                 wb->offset  = align;
680                 }
681         else if (prefix_len)
682                 {
683                 p = wb->buf + wb->offset + prefix_len;
684                 }
685         else
686                 {
687 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
688                 align = (int)wb->buf + SSL3_RT_HEADER_LENGTH;
689                 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
690 #endif
691                 p = wb->buf + align;
692                 wb->offset  = align;
693                 }
694
695         /* write the header */
696
697         *(p++)=type&0xff;
698         wr->type=type;
699
700         *(p++)=(s->version>>8);
701         *(p++)=s->version&0xff;
702
703         /* field where we are to write out packet length */
704         plen=p; 
705         p+=2;
706
707         /* lets setup the record stuff. */
708         wr->data=p;
709         wr->length=(int)len;
710         wr->input=(unsigned char *)buf;
711
712         /* we now 'read' from wr->input, wr->length bytes into
713          * wr->data */
714
715         /* first we compress */
716         if (s->compress != NULL)
717                 {
718                 if (!ssl3_do_compress(s))
719                         {
720                         SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
721                         goto err;
722                         }
723                 }
724         else
725                 {
726                 memcpy(wr->data,wr->input,wr->length);
727                 wr->input=wr->data;
728                 }
729
730         /* we should still have the output to wr->data and the input
731          * from wr->input.  Length should be wr->length.
732          * wr->data still points in the wb->buf */
733
734         if (mac_size != 0)
735                 {
736                 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
737                 wr->length+=mac_size;
738                 wr->input=p;
739                 wr->data=p;
740                 }
741
742         /* ssl3_enc can only have an error on read */
743         s->method->ssl3_enc->enc(s,1);
744
745         /* record length after mac and block padding */
746         s2n(wr->length,plen);
747
748         /* we should now have
749          * wr->data pointing to the encrypted data, which is
750          * wr->length long */
751         wr->type=type; /* not needed but helps for debugging */
752         wr->length+=SSL3_RT_HEADER_LENGTH;
753
754         if (create_empty_fragment)
755                 {
756                 /* we are in a recursive call;
757                  * just return the length, don't write out anything here
758                  */
759                 return wr->length;
760                 }
761
762         /* now let's set up wb */
763         wb->left = prefix_len + wr->length;
764
765         /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
766         s->s3->wpend_tot=len;
767         s->s3->wpend_buf=buf;
768         s->s3->wpend_type=type;
769         s->s3->wpend_ret=len;
770
771         /* we now just need to write the buffer */
772         return ssl3_write_pending(s,type,buf,len);
773 err:
774         return -1;
775         }
776
777 /* if s->s3->wbuf.left != 0, we need to call this */
778 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
779         unsigned int len)
780         {
781         int i;
782         SSL3_BUFFER *wb=&(s->s3->wbuf);
783
784 /* XXXX */
785         if ((s->s3->wpend_tot > (int)len)
786                 || ((s->s3->wpend_buf != buf) &&
787                         !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
788                 || (s->s3->wpend_type != type))
789                 {
790                 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
791                 return(-1);
792                 }
793
794         for (;;)
795                 {
796                 clear_sys_error();
797                 if (s->wbio != NULL)
798                         {
799                         s->rwstate=SSL_WRITING;
800                         i=BIO_write(s->wbio,
801                                 (char *)&(wb->buf[wb->offset]),
802                                 (unsigned int)wb->left);
803                         }
804                 else
805                         {
806                         SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
807                         i= -1;
808                         }
809                 if (i == wb->left)
810                         {
811                         wb->left=0;
812                         wb->offset+=i;
813                         s->rwstate=SSL_NOTHING;
814                         return(s->s3->wpend_ret);
815                         }
816                 else if (i <= 0)
817                         return(i);
818                 wb->offset+=i;
819                 wb->left-=i;
820                 }
821         }
822
823 /* Return up to 'len' payload bytes received in 'type' records.
824  * 'type' is one of the following:
825  *
826  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
827  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
828  *   -  0 (during a shutdown, no data has to be returned)
829  *
830  * If we don't have stored data to work from, read a SSL/TLS record first
831  * (possibly multiple records if we still don't have anything to return).
832  *
833  * This function must handle any surprises the peer may have for us, such as
834  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
835  * a surprise, but handled as if it were), or renegotiation requests.
836  * Also if record payloads contain fragments too small to process, we store
837  * them until there is enough for the respective protocol (the record protocol
838  * may use arbitrary fragmentation and even interleaving):
839  *     Change cipher spec protocol
840  *             just 1 byte needed, no need for keeping anything stored
841  *     Alert protocol
842  *             2 bytes needed (AlertLevel, AlertDescription)
843  *     Handshake protocol
844  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
845  *             to detect unexpected Client Hello and Hello Request messages
846  *             here, anything else is handled by higher layers
847  *     Application data protocol
848  *             none of our business
849  */
850 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
851         {
852         int al,i,j,ret;
853         unsigned int n;
854         SSL3_RECORD *rr;
855         void (*cb)(const SSL *ssl,int type2,int val)=NULL;
856
857         if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
858                 if (!ssl3_setup_buffers(s))
859                         return(-1);
860
861         if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
862             (peek && (type != SSL3_RT_APPLICATION_DATA)))
863                 {
864                 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
865                 return -1;
866                 }
867
868         if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
869                 /* (partially) satisfy request from storage */
870                 {
871                 unsigned char *src = s->s3->handshake_fragment;
872                 unsigned char *dst = buf;
873                 unsigned int k;
874
875                 /* peek == 0 */
876                 n = 0;
877                 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
878                         {
879                         *dst++ = *src++;
880                         len--; s->s3->handshake_fragment_len--;
881                         n++;
882                         }
883                 /* move any remaining fragment bytes: */
884                 for (k = 0; k < s->s3->handshake_fragment_len; k++)
885                         s->s3->handshake_fragment[k] = *src++;
886                 return n;
887         }
888
889         /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
890
891         if (!s->in_handshake && SSL_in_init(s))
892                 {
893                 /* type == SSL3_RT_APPLICATION_DATA */
894                 i=s->handshake_func(s);
895                 if (i < 0) return(i);
896                 if (i == 0)
897                         {
898                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
899                         return(-1);
900                         }
901                 }
902 start:
903         s->rwstate=SSL_NOTHING;
904
905         /* s->s3->rrec.type         - is the type of record
906          * s->s3->rrec.data,    - data
907          * s->s3->rrec.off,     - offset into 'data' for next read
908          * s->s3->rrec.length,  - number of bytes. */
909         rr = &(s->s3->rrec);
910
911         /* get new packet if necessary */
912         if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
913                 {
914                 ret=ssl3_get_record(s);
915                 if (ret <= 0) return(ret);
916                 }
917
918         /* we now have a packet which can be read and processed */
919
920         if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
921                                        * reset by ssl3_get_finished */
922                 && (rr->type != SSL3_RT_HANDSHAKE))
923                 {
924                 al=SSL_AD_UNEXPECTED_MESSAGE;
925                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
926                 goto f_err;
927                 }
928
929         /* If the other end has shut down, throw anything we read away
930          * (even in 'peek' mode) */
931         if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
932                 {
933                 rr->length=0;
934                 s->rwstate=SSL_NOTHING;
935                 return(0);
936                 }
937
938
939         if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
940                 {
941                 /* make sure that we are not getting application data when we
942                  * are doing a handshake for the first time */
943                 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
944                         (s->enc_read_ctx == NULL))
945                         {
946                         al=SSL_AD_UNEXPECTED_MESSAGE;
947                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
948                         goto f_err;
949                         }
950
951                 if (len <= 0) return(len);
952
953                 if ((unsigned int)len > rr->length)
954                         n = rr->length;
955                 else
956                         n = (unsigned int)len;
957
958                 memcpy(buf,&(rr->data[rr->off]),n);
959                 if (!peek)
960                         {
961                         rr->length-=n;
962                         rr->off+=n;
963                         if (rr->length == 0)
964                                 {
965                                 s->rstate=SSL_ST_READ_HEADER;
966                                 rr->off=0;
967                                 }
968                         }
969                 return(n);
970                 }
971
972
973         /* If we get here, then type != rr->type; if we have a handshake
974          * message, then it was unexpected (Hello Request or Client Hello). */
975
976         /* In case of record types for which we have 'fragment' storage,
977          * fill that so that we can process the data at a fixed place.
978          */
979                 {
980                 unsigned int dest_maxlen = 0;
981                 unsigned char *dest = NULL;
982                 unsigned int *dest_len = NULL;
983
984                 if (rr->type == SSL3_RT_HANDSHAKE)
985                         {
986                         dest_maxlen = sizeof s->s3->handshake_fragment;
987                         dest = s->s3->handshake_fragment;
988                         dest_len = &s->s3->handshake_fragment_len;
989                         }
990                 else if (rr->type == SSL3_RT_ALERT)
991                         {
992                         dest_maxlen = sizeof s->s3->alert_fragment;
993                         dest = s->s3->alert_fragment;
994                         dest_len = &s->s3->alert_fragment_len;
995                         }
996
997                 if (dest_maxlen > 0)
998                         {
999                         n = dest_maxlen - *dest_len; /* available space in 'dest' */
1000                         if (rr->length < n)
1001                                 n = rr->length; /* available bytes */
1002
1003                         /* now move 'n' bytes: */
1004                         while (n-- > 0)
1005                                 {
1006                                 dest[(*dest_len)++] = rr->data[rr->off++];
1007                                 rr->length--;
1008                                 }
1009
1010                         if (*dest_len < dest_maxlen)
1011                                 goto start; /* fragment was too small */
1012                         }
1013                 }
1014
1015         /* s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
1016          * s->s3->alert_fragment_len == 2      iff  rr->type == SSL3_RT_ALERT.
1017          * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1018
1019         /* If we are a client, check for an incoming 'Hello Request': */
1020         if ((!s->server) &&
1021                 (s->s3->handshake_fragment_len >= 4) &&
1022                 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1023                 (s->session != NULL) && (s->session->cipher != NULL))
1024                 {
1025                 s->s3->handshake_fragment_len = 0;
1026
1027                 if ((s->s3->handshake_fragment[1] != 0) ||
1028                         (s->s3->handshake_fragment[2] != 0) ||
1029                         (s->s3->handshake_fragment[3] != 0))
1030                         {
1031                         al=SSL_AD_DECODE_ERROR;
1032                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1033                         goto f_err;
1034                         }
1035
1036                 if (s->msg_callback)
1037                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1038
1039                 if (SSL_is_init_finished(s) &&
1040                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1041                         !s->s3->renegotiate)
1042                         {
1043                         ssl3_renegotiate(s);
1044                         if (ssl3_renegotiate_check(s))
1045                                 {
1046                                 i=s->handshake_func(s);
1047                                 if (i < 0) return(i);
1048                                 if (i == 0)
1049                                         {
1050                                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1051                                         return(-1);
1052                                         }
1053
1054                                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1055                                         {
1056                                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1057                                                 {
1058                                                 BIO *bio;
1059                                                 /* In the case where we try to read application data,
1060                                                  * but we trigger an SSL handshake, we return -1 with
1061                                                  * the retry option set.  Otherwise renegotiation may
1062                                                  * cause nasty problems in the blocking world */
1063                                                 s->rwstate=SSL_READING;
1064                                                 bio=SSL_get_rbio(s);
1065                                                 BIO_clear_retry_flags(bio);
1066                                                 BIO_set_retry_read(bio);
1067                                                 return(-1);
1068                                                 }
1069                                         }
1070                                 }
1071                         }
1072                 /* we either finished a handshake or ignored the request,
1073                  * now try again to obtain the (application) data we were asked for */
1074                 goto start;
1075                 }
1076
1077         if (s->s3->alert_fragment_len >= 2)
1078                 {
1079                 int alert_level = s->s3->alert_fragment[0];
1080                 int alert_descr = s->s3->alert_fragment[1];
1081
1082                 s->s3->alert_fragment_len = 0;
1083
1084                 if (s->msg_callback)
1085                         s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1086
1087                 if (s->info_callback != NULL)
1088                         cb=s->info_callback;
1089                 else if (s->ctx->info_callback != NULL)
1090                         cb=s->ctx->info_callback;
1091
1092                 if (cb != NULL)
1093                         {
1094                         j = (alert_level << 8) | alert_descr;
1095                         cb(s, SSL_CB_READ_ALERT, j);
1096                         }
1097
1098                 if (alert_level == 1) /* warning */
1099                         {
1100                         s->s3->warn_alert = alert_descr;
1101                         if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1102                                 {
1103                                 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1104                                 return(0);
1105                                 }
1106                         }
1107                 else if (alert_level == 2) /* fatal */
1108                         {
1109                         char tmp[16];
1110
1111                         s->rwstate=SSL_NOTHING;
1112                         s->s3->fatal_alert = alert_descr;
1113                         SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1114                         BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1115                         ERR_add_error_data(2,"SSL alert number ",tmp);
1116                         s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1117                         SSL_CTX_remove_session(s->ctx,s->session);
1118                         return(0);
1119                         }
1120                 else
1121                         {
1122                         al=SSL_AD_ILLEGAL_PARAMETER;
1123                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1124                         goto f_err;
1125                         }
1126
1127                 goto start;
1128                 }
1129
1130         if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1131                 {
1132                 s->rwstate=SSL_NOTHING;
1133                 rr->length=0;
1134                 return(0);
1135                 }
1136
1137         if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1138                 {
1139                 /* 'Change Cipher Spec' is just a single byte, so we know
1140                  * exactly what the record payload has to look like */
1141                 if (    (rr->length != 1) || (rr->off != 0) ||
1142                         (rr->data[0] != SSL3_MT_CCS))
1143                         {
1144                         al=SSL_AD_ILLEGAL_PARAMETER;
1145                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1146                         goto f_err;
1147                         }
1148
1149                 /* Check we have a cipher to change to */
1150                 if (s->s3->tmp.new_cipher == NULL)
1151                         {
1152                         al=SSL_AD_UNEXPECTED_MESSAGE;
1153                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1154                         goto f_err;
1155                         }
1156
1157                 rr->length=0;
1158
1159                 if (s->msg_callback)
1160                         s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1161
1162                 s->s3->change_cipher_spec=1;
1163                 if (!ssl3_do_change_cipher_spec(s))
1164                         goto err;
1165                 else
1166                         goto start;
1167                 }
1168
1169         /* Unexpected handshake message (Client Hello, or protocol violation) */
1170         if ((s->s3->handshake_fragment_len >= 4) &&     !s->in_handshake)
1171                 {
1172                 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1173                         !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1174                         {
1175 #if 0 /* worked only because C operator preferences are not as expected (and
1176        * because this is not really needed for clients except for detecting
1177        * protocol violations): */
1178                         s->state=SSL_ST_BEFORE|(s->server)
1179                                 ?SSL_ST_ACCEPT
1180                                 :SSL_ST_CONNECT;
1181 #else
1182                         s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1183 #endif
1184                         s->new_session=1;
1185                         }
1186                 i=s->handshake_func(s);
1187                 if (i < 0) return(i);
1188                 if (i == 0)
1189                         {
1190                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1191                         return(-1);
1192                         }
1193
1194                 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1195                         {
1196                         if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1197                                 {
1198                                 BIO *bio;
1199                                 /* In the case where we try to read application data,
1200                                  * but we trigger an SSL handshake, we return -1 with
1201                                  * the retry option set.  Otherwise renegotiation may
1202                                  * cause nasty problems in the blocking world */
1203                                 s->rwstate=SSL_READING;
1204                                 bio=SSL_get_rbio(s);
1205                                 BIO_clear_retry_flags(bio);
1206                                 BIO_set_retry_read(bio);
1207                                 return(-1);
1208                                 }
1209                         }
1210                 goto start;
1211                 }
1212
1213         switch (rr->type)
1214                 {
1215         default:
1216 #ifndef OPENSSL_NO_TLS
1217                 /* TLS just ignores unknown message types */
1218                 if (s->version == TLS1_VERSION)
1219                         {
1220                         rr->length = 0;
1221                         goto start;
1222                         }
1223 #endif
1224                 al=SSL_AD_UNEXPECTED_MESSAGE;
1225                 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1226                 goto f_err;
1227         case SSL3_RT_CHANGE_CIPHER_SPEC:
1228         case SSL3_RT_ALERT:
1229         case SSL3_RT_HANDSHAKE:
1230                 /* we already handled all of these, with the possible exception
1231                  * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1232                  * should not happen when type != rr->type */
1233                 al=SSL_AD_UNEXPECTED_MESSAGE;
1234                 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1235                 goto f_err;
1236         case SSL3_RT_APPLICATION_DATA:
1237                 /* At this point, we were expecting handshake data,
1238                  * but have application data.  If the library was
1239                  * running inside ssl3_read() (i.e. in_read_app_data
1240                  * is set) and it makes sense to read application data
1241                  * at this point (session renegotiation not yet started),
1242                  * we will indulge it.
1243                  */
1244                 if (s->s3->in_read_app_data &&
1245                         (s->s3->total_renegotiations != 0) &&
1246                         ((
1247                                 (s->state & SSL_ST_CONNECT) &&
1248                                 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1249                                 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1250                                 ) || (
1251                                         (s->state & SSL_ST_ACCEPT) &&
1252                                         (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1253                                         (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1254                                         )
1255                                 ))
1256                         {
1257                         s->s3->in_read_app_data=2;
1258                         return(-1);
1259                         }
1260                 else
1261                         {
1262                         al=SSL_AD_UNEXPECTED_MESSAGE;
1263                         SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1264                         goto f_err;
1265                         }
1266                 }
1267         /* not reached */
1268
1269 f_err:
1270         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1271 err:
1272         return(-1);
1273         }
1274
1275 int ssl3_do_change_cipher_spec(SSL *s)
1276         {
1277         int i;
1278         const char *sender;
1279         int slen;
1280
1281         if (s->state & SSL_ST_ACCEPT)
1282                 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1283         else
1284                 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1285
1286         if (s->s3->tmp.key_block == NULL)
1287                 {
1288                 s->session->cipher=s->s3->tmp.new_cipher;
1289                 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1290                 }
1291
1292         if (!s->method->ssl3_enc->change_cipher_state(s,i))
1293                 return(0);
1294
1295         /* we have to record the message digest at
1296          * this point so we can get it before we read
1297          * the finished message */
1298         if (s->state & SSL_ST_CONNECT)
1299                 {
1300                 sender=s->method->ssl3_enc->server_finished_label;
1301                 slen=s->method->ssl3_enc->server_finished_label_len;
1302                 }
1303         else
1304                 {
1305                 sender=s->method->ssl3_enc->client_finished_label;
1306                 slen=s->method->ssl3_enc->client_finished_label_len;
1307                 }
1308
1309         s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1310                 &(s->s3->finish_dgst1),
1311                 &(s->s3->finish_dgst2),
1312                 sender,slen,s->s3->tmp.peer_finish_md);
1313
1314         return(1);
1315         }
1316
1317 void ssl3_send_alert(SSL *s, int level, int desc)
1318         {
1319         /* Map tls/ssl alert value to correct one */
1320         desc=s->method->ssl3_enc->alert_value(desc);
1321         if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1322                 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1323         if (desc < 0) return;
1324         /* If a fatal one, remove from cache */
1325         if ((level == 2) && (s->session != NULL))
1326                 SSL_CTX_remove_session(s->ctx,s->session);
1327
1328         s->s3->alert_dispatch=1;
1329         s->s3->send_alert[0]=level;
1330         s->s3->send_alert[1]=desc;
1331         if (s->s3->wbuf.left == 0) /* data still being written out? */
1332                 s->method->ssl_dispatch_alert(s);
1333         /* else data is still being written out, we will get written
1334          * some time in the future */
1335         }
1336
1337 int ssl3_dispatch_alert(SSL *s)
1338         {
1339         int i,j;
1340         void (*cb)(const SSL *ssl,int type,int val)=NULL;
1341
1342         s->s3->alert_dispatch=0;
1343         i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1344         if (i <= 0)
1345                 {
1346                 s->s3->alert_dispatch=1;
1347                 }
1348         else
1349                 {
1350                 /* Alert sent to BIO.  If it is important, flush it now.
1351                  * If the message does not get sent due to non-blocking IO,
1352                  * we will not worry too much. */
1353                 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1354                         (void)BIO_flush(s->wbio);
1355
1356                 if (s->msg_callback)
1357                         s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1358
1359                 if (s->info_callback != NULL)
1360                         cb=s->info_callback;
1361                 else if (s->ctx->info_callback != NULL)
1362                         cb=s->ctx->info_callback;
1363
1364                 if (cb != NULL)
1365                         {
1366                         j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1367                         cb(s,SSL_CB_WRITE_ALERT,j);
1368                         }
1369                 }
1370         return(i);
1371         }