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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;
133 long align=0;
134 unsigned char *pkt;
135 SSL3_BUFFER *rb;
136
137 if (n <= 0) return n;
138
139 rb = &(s->s3->rbuf);
140 if (rb->buf == NULL)
141 if (!ssl3_setup_read_buffer(s))
142 return -1;
143
144 left = rb->left;
145 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
146 align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
147 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
148 #endif
149
150 if (!extend)
151 {
152 /* start with empty packet ... */
153 if (left == 0)
154 rb->offset = align;
155 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
156 {
157 /* check if next packet length is large
158 * enough to justify payload alignment... */
159 pkt = rb->buf + rb->offset;
160 if (pkt[0] == SSL3_RT_APPLICATION_DATA
161 && (pkt[3]<<8|pkt[4]) >= 128)
162 {
163 /* Note that even if packet is corrupted
164 * and its length field is insane, we can
165 * only be led to wrong decision about
166 * whether memmove will occur or not.
167 * Header values has no effect on memmove
168 * arguments and therefore no buffer
169 * overrun can be triggered. */
170 memmove (rb->buf+align,pkt,left);
171 rb->offset = align;
172 }
173 }
174 s->packet = rb->buf + rb->offset;
175 s->packet_length = 0;
176 /* ... now we can act as if 'extend' was set */
177 }
178
179 /* extend reads should not span multiple packets for DTLS */
180 if ( SSL_version(s) == DTLS1_VERSION &&
181 extend)
182 {
183 if ( left > 0 && n > left)
184 n = left;
185 }
186
187 /* if there is enough in the buffer from a previous read, take some */
188 if (left >= n)
189 {
190 s->packet_length+=n;
191 rb->left=left-n;
192 rb->offset+=n;
193 return(n);
194 }
195
196 /* else we need to read more data */
197
198 len = s->packet_length;
199 pkt = rb->buf+align;
200 /* Move any available bytes to front of buffer:
201 * 'len' bytes already pointed to by 'packet',
202 * 'left' extra ones at the end */
203 if (s->packet != pkt) /* len > 0 */
204 {
205 memmove(pkt, s->packet, len+left);
206 s->packet = pkt;
207 rb->offset = len + align;
208 }
209
210 max = rb->len - rb->offset;
211 if (n > max) /* does not happen */
212 {
213 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
214 return -1;
215 }
216
217 if (!s->read_ahead)
218 max=n;
219
220 while (left < n)
221 {
222 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
223 * and need to read in more until we have len+n (up to
224 * len+max if possible) */
225
226 clear_sys_error();
227 if (s->rbio != NULL)
228 {
229 s->rwstate=SSL_READING;
230 i=BIO_read(s->rbio,pkt+len+left, max-left);
231 }
232 else
233 {
234 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
235 i = -1;
236 }
237
238 if (i <= 0)
239 {
240 rb->left = left;
241 if (s->mode & SSL_MODE_RELEASE_BUFFERS)
242 if (len+left == 0)
243 ssl3_release_read_buffer(s);
244 return(i);
245 }
246 left+=i;
247 }
248
249 /* done reading, now the book-keeping */
250 rb->offset += n;
251 rb->left = left - n;
252 s->packet_length += n;
253 s->rwstate=SSL_NOTHING;
254 return(n);
255 }
256
257 /* Call this to get a new input record.
258 * It will return <= 0 if more data is needed, normally due to an error
259 * or non-blocking IO.
260 * When it finishes, one packet has been decoded and can be found in
261 * ssl->s3->rrec.type - is the type of record
262 * ssl->s3->rrec.data, - data
263 * ssl->s3->rrec.length, - number of bytes
264 */
265 /* used only by ssl3_read_bytes */
266 static int ssl3_get_record(SSL *s)
267 {
268 int ssl_major,ssl_minor,al;
269 int enc_err,n,i,ret= -1;
270 SSL3_RECORD *rr;
271 SSL_SESSION *sess;
272 unsigned char *p;
273 unsigned char md[EVP_MAX_MD_SIZE];
274 short version;
275 int mac_size;
276 int clear=0;
277 size_t extra;
278 int decryption_failed_or_bad_record_mac = 0;
279 unsigned char *mac = NULL;
280
281 rr= &(s->s3->rrec);
282 sess=s->session;
283
284 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
285 extra=SSL3_RT_MAX_EXTRA;
286 else
287 extra=0;
288 if (extra && !s->s3->init_extra)
289 {
290 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
291 * set after ssl3_setup_buffers() was done */
292 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
293 return -1;
294 }
295
296 again:
297 /* check if we have the header */
298 if ( (s->rstate != SSL_ST_READ_BODY) ||
299 (s->packet_length < SSL3_RT_HEADER_LENGTH))
300 {
301 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
302 if (n <= 0) return(n); /* error or non-blocking */
303 s->rstate=SSL_ST_READ_BODY;
304
305 p=s->packet;
306
307 /* Pull apart the header into the SSL3_RECORD */
308 rr->type= *(p++);
309 ssl_major= *(p++);
310 ssl_minor= *(p++);
311 version=(ssl_major<<8)|ssl_minor;
312 n2s(p,rr->length);
313 #if 0
314 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
315 #endif
316
317 /* Lets check version */
318 if (!s->first_packet)
319 {
320 if (version != s->version)
321 {
322 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
323 /* Send back error using their
324 * version number :-) */
325 s->version=version;
326 al=SSL_AD_PROTOCOL_VERSION;
327 goto f_err;
328 }
329 }
330
331 if ((version>>8) != SSL3_VERSION_MAJOR)
332 {
333 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
334 goto err;
335 }
336
337 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
338 {
339 al=SSL_AD_RECORD_OVERFLOW;
340 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
341 goto f_err;
342 }
343
344 /* now s->rstate == SSL_ST_READ_BODY */
345 }
346
347 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
348
349 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
350 {
351 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
352 i=rr->length;
353 n=ssl3_read_n(s,i,i,1);
354 if (n <= 0) return(n); /* error or non-blocking io */
355 /* now n == rr->length,
356 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
357 }
358
359 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
360
361 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
362 * and we have that many bytes in s->packet
363 */
364 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
365
366 /* ok, we can now read from 's->packet' data into 'rr'
367 * rr->input points at rr->length bytes, which
368 * need to be copied into rr->data by either
369 * the decryption or by the decompression
370 * When the data is 'copied' into the rr->data buffer,
371 * rr->input will be pointed at the new buffer */
372
373 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
374 * rr->length bytes of encrypted compressed stuff. */
375
376 /* check is not needed I believe */
377 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
378 {
379 al=SSL_AD_RECORD_OVERFLOW;
380 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
381 goto f_err;
382 }
383
384 /* decrypt in place in 'rr->input' */
385 rr->data=rr->input;
386
387 enc_err = s->method->ssl3_enc->enc(s,0);
388 if (enc_err <= 0)
389 {
390 if (enc_err == 0)
391 /* SSLerr() and ssl3_send_alert() have been called */
392 goto err;
393
394 /* Otherwise enc_err == -1, which indicates bad padding
395 * (rec->length has not been changed in this case).
396 * To minimize information leaked via timing, we will perform
397 * the MAC computation anyway. */
398 decryption_failed_or_bad_record_mac = 1;
399 }
400
401 #ifdef TLS_DEBUG
402 printf("dec %d\n",rr->length);
403 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
404 printf("\n");
405 #endif
406
407 /* r->length is now the compressed data plus mac */
408 if ( (sess == NULL) ||
409 (s->enc_read_ctx == NULL) ||
410 (EVP_MD_CTX_md(s->read_hash) == NULL))
411 clear=1;
412
413 if (!clear)
414 {
415 /* !clear => s->read_hash != NULL => mac_size != -1 */
416 mac_size=EVP_MD_CTX_size(s->read_hash);
417 OPENSSL_assert(mac_size >= 0);
418
419 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
420 {
421 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
422 al=SSL_AD_RECORD_OVERFLOW;
423 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
424 goto f_err;
425 #else
426 decryption_failed_or_bad_record_mac = 1;
427 #endif
428 }
429 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
430 if (rr->length >= (unsigned int)mac_size)
431 {
432 rr->length -= mac_size;
433 mac = &rr->data[rr->length];
434 }
435 else
436 {
437 /* record (minus padding) is too short to contain a MAC */
438 #if 0 /* OK only for stream ciphers */
439 al=SSL_AD_DECODE_ERROR;
440 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
441 goto f_err;
442 #else
443 decryption_failed_or_bad_record_mac = 1;
444 rr->length = 0;
445 #endif
446 }
447 i=s->method->ssl3_enc->mac(s,md,0);
448 if (i < 0 || mac == NULL || memcmp(md, mac, (size_t)mac_size) != 0)
449 {
450 decryption_failed_or_bad_record_mac = 1;
451 }
452 }
453
454 if (decryption_failed_or_bad_record_mac)
455 {
456 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
457 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
458 * failure is directly visible from the ciphertext anyway,
459 * we should not reveal which kind of error occured -- this
460 * might become visible to an attacker (e.g. via a logfile) */
461 al=SSL_AD_BAD_RECORD_MAC;
462 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
463 goto f_err;
464 }
465
466 /* r->length is now just compressed */
467 if (s->expand != NULL)
468 {
469 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
470 {
471 al=SSL_AD_RECORD_OVERFLOW;
472 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
473 goto f_err;
474 }
475 if (!ssl3_do_uncompress(s))
476 {
477 al=SSL_AD_DECOMPRESSION_FAILURE;
478 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
479 goto f_err;
480 }
481 }
482
483 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
484 {
485 al=SSL_AD_RECORD_OVERFLOW;
486 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
487 goto f_err;
488 }
489
490 rr->off=0;
491 /* So at this point the following is true
492 * ssl->s3->rrec.type is the type of record
493 * ssl->s3->rrec.length == number of bytes in record
494 * ssl->s3->rrec.off == offset to first valid byte
495 * ssl->s3->rrec.data == where to take bytes from, increment
496 * after use :-).
497 */
498
499 /* we have pulled in a full packet so zero things */
500 s->packet_length=0;
501
502 /* just read a 0 length packet */
503 if (rr->length == 0) goto again;
504
505 #if 0
506 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
507 #endif
508
509 return(1);
510
511 f_err:
512 ssl3_send_alert(s,SSL3_AL_FATAL,al);
513 err:
514 return(ret);
515 }
516
517 int ssl3_do_uncompress(SSL *ssl)
518 {
519 #ifndef OPENSSL_NO_COMP
520 int i;
521 SSL3_RECORD *rr;
522
523 rr= &(ssl->s3->rrec);
524 i=COMP_expand_block(ssl->expand,rr->comp,
525 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
526 if (i < 0)
527 return(0);
528 else
529 rr->length=i;
530 rr->data=rr->comp;
531 #endif
532 return(1);
533 }
534
535 int ssl3_do_compress(SSL *ssl)
536 {
537 #ifndef OPENSSL_NO_COMP
538 int i;
539 SSL3_RECORD *wr;
540
541 wr= &(ssl->s3->wrec);
542 i=COMP_compress_block(ssl->compress,wr->data,
543 SSL3_RT_MAX_COMPRESSED_LENGTH,
544 wr->input,(int)wr->length);
545 if (i < 0)
546 return(0);
547 else
548 wr->length=i;
549
550 wr->input=wr->data;
551 #endif
552 return(1);
553 }
554
555 /* Call this to write data in records of type 'type'
556 * It will return <= 0 if not all data has been sent or non-blocking IO.
557 */
558 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
559 {
560 const unsigned char *buf=buf_;
561 unsigned int tot,n,nw;
562 int i;
563
564 s->rwstate=SSL_NOTHING;
565 tot=s->s3->wnum;
566 s->s3->wnum=0;
567
568 if (SSL_in_init(s) && !s->in_handshake)
569 {
570 i=s->handshake_func(s);
571 if (i < 0) return(i);
572 if (i == 0)
573 {
574 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
575 return -1;
576 }
577 }
578
579 n=(len-tot);
580 for (;;)
581 {
582 if (n > s->max_send_fragment)
583 nw=s->max_send_fragment;
584 else
585 nw=n;
586
587 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
588 if (i <= 0)
589 {
590 s->s3->wnum=tot;
591 return i;
592 }
593
594 if ((i == (int)n) ||
595 (type == SSL3_RT_APPLICATION_DATA &&
596 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
597 {
598 /* next chunk of data should get another prepended empty fragment
599 * in ciphersuites with known-IV weakness: */
600 s->s3->empty_fragment_done = 0;
601
602 return tot+i;
603 }
604
605 n-=i;
606 tot+=i;
607 }
608 }
609
610 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
611 unsigned int len, int create_empty_fragment)
612 {
613 unsigned char *p,*plen;
614 int i,mac_size,clear=0;
615 int prefix_len=0;
616 long align=0;
617 SSL3_RECORD *wr;
618 SSL3_BUFFER *wb=&(s->s3->wbuf);
619 SSL_SESSION *sess;
620
621 if (wb->buf == NULL)
622 if (!ssl3_setup_write_buffer(s))
623 return -1;
624
625 /* first check if there is a SSL3_BUFFER still being written
626 * out. This will happen with non blocking IO */
627 if (wb->left != 0)
628 return(ssl3_write_pending(s,type,buf,len));
629
630 /* If we have an alert to send, lets send it */
631 if (s->s3->alert_dispatch)
632 {
633 i=s->method->ssl_dispatch_alert(s);
634 if (i <= 0)
635 return(i);
636 /* if it went, fall through and send more stuff */
637 }
638
639 if (len == 0 && !create_empty_fragment)
640 return 0;
641
642 wr= &(s->s3->wrec);
643 sess=s->session;
644
645 if ( (sess == NULL) ||
646 (s->enc_write_ctx == NULL) ||
647 (EVP_MD_CTX_md(s->write_hash) == NULL))
648 clear=1;
649
650 if (clear)
651 mac_size=0;
652 else
653 {
654 mac_size=EVP_MD_CTX_size(s->write_hash);
655 if (mac_size < 0)
656 goto err;
657 }
658
659 /* 'create_empty_fragment' is true only when this function calls itself */
660 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
661 {
662 /* countermeasure against known-IV weakness in CBC ciphersuites
663 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
664
665 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
666 {
667 /* recursive function call with 'create_empty_fragment' set;
668 * this prepares and buffers the data for an empty fragment
669 * (these 'prefix_len' bytes are sent out later
670 * together with the actual payload) */
671 prefix_len = do_ssl3_write(s, type, buf, 0, 1);
672 if (prefix_len <= 0)
673 goto err;
674
675 if (prefix_len >
676 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
677 {
678 /* insufficient space */
679 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
680 goto err;
681 }
682 }
683
684 s->s3->empty_fragment_done = 1;
685 }
686
687 if (create_empty_fragment)
688 {
689 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
690 /* extra fragment would be couple of cipher blocks,
691 * which would be multiple of SSL3_ALIGN_PAYLOAD, so
692 * if we want to align the real payload, then we can
693 * just pretent we simply have two headers. */
694 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
695 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
696 #endif
697 p = wb->buf + align;
698 wb->offset = align;
699 }
700 else if (prefix_len)
701 {
702 p = wb->buf + wb->offset + prefix_len;
703 }
704 else
705 {
706 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
707 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
708 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
709 #endif
710 p = wb->buf + align;
711 wb->offset = align;
712 }
713
714 /* write the header */
715
716 *(p++)=type&0xff;
717 wr->type=type;
718
719 *(p++)=(s->version>>8);
720 *(p++)=s->version&0xff;
721
722 /* field where we are to write out packet length */
723 plen=p;
724 p+=2;
725
726 /* lets setup the record stuff. */
727 wr->data=p;
728 wr->length=(int)len;
729 wr->input=(unsigned char *)buf;
730
731 /* we now 'read' from wr->input, wr->length bytes into
732 * wr->data */
733
734 /* first we compress */
735 if (s->compress != NULL)
736 {
737 if (!ssl3_do_compress(s))
738 {
739 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
740 goto err;
741 }
742 }
743 else
744 {
745 memcpy(wr->data,wr->input,wr->length);
746 wr->input=wr->data;
747 }
748
749 /* we should still have the output to wr->data and the input
750 * from wr->input. Length should be wr->length.
751 * wr->data still points in the wb->buf */
752
753 if (mac_size != 0)
754 {
755 if (s->method->ssl3_enc->mac(s,&(p[wr->length]),1) < 0)
756 goto err;
757 wr->length+=mac_size;
758 wr->input=p;
759 wr->data=p;
760 }
761
762 /* ssl3_enc can only have an error on read */
763 s->method->ssl3_enc->enc(s,1);
764
765 /* record length after mac and block padding */
766 s2n(wr->length,plen);
767
768 /* we should now have
769 * wr->data pointing to the encrypted data, which is
770 * wr->length long */
771 wr->type=type; /* not needed but helps for debugging */
772 wr->length+=SSL3_RT_HEADER_LENGTH;
773
774 if (create_empty_fragment)
775 {
776 /* we are in a recursive call;
777 * just return the length, don't write out anything here
778 */
779 return wr->length;
780 }
781
782 /* now let's set up wb */
783 wb->left = prefix_len + wr->length;
784
785 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
786 s->s3->wpend_tot=len;
787 s->s3->wpend_buf=buf;
788 s->s3->wpend_type=type;
789 s->s3->wpend_ret=len;
790
791 /* we now just need to write the buffer */
792 return ssl3_write_pending(s,type,buf,len);
793 err:
794 return -1;
795 }
796
797 /* if s->s3->wbuf.left != 0, we need to call this */
798 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
799 unsigned int len)
800 {
801 int i;
802 SSL3_BUFFER *wb=&(s->s3->wbuf);
803
804 /* XXXX */
805 if ((s->s3->wpend_tot > (int)len)
806 || ((s->s3->wpend_buf != buf) &&
807 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
808 || (s->s3->wpend_type != type))
809 {
810 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
811 return(-1);
812 }
813
814 for (;;)
815 {
816 clear_sys_error();
817 if (s->wbio != NULL)
818 {
819 s->rwstate=SSL_WRITING;
820 i=BIO_write(s->wbio,
821 (char *)&(wb->buf[wb->offset]),
822 (unsigned int)wb->left);
823 }
824 else
825 {
826 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
827 i= -1;
828 }
829 if (i == wb->left)
830 {
831 wb->left=0;
832 wb->offset+=i;
833 if (s->mode & SSL_MODE_RELEASE_BUFFERS)
834 ssl3_release_write_buffer(s);
835 s->rwstate=SSL_NOTHING;
836 return(s->s3->wpend_ret);
837 }
838 else if (i <= 0) {
839 if (s->version == DTLS1_VERSION) {
840 /* For DTLS, just drop it. That's kind of the wh
841 ole
842 point in using a datagram service */
843 wb->left = 0;
844 }
845 return(i);
846 }
847 wb->offset+=i;
848 wb->left-=i;
849 }
850 }
851
852 /* Return up to 'len' payload bytes received in 'type' records.
853 * 'type' is one of the following:
854 *
855 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
856 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
857 * - 0 (during a shutdown, no data has to be returned)
858 *
859 * If we don't have stored data to work from, read a SSL/TLS record first
860 * (possibly multiple records if we still don't have anything to return).
861 *
862 * This function must handle any surprises the peer may have for us, such as
863 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
864 * a surprise, but handled as if it were), or renegotiation requests.
865 * Also if record payloads contain fragments too small to process, we store
866 * them until there is enough for the respective protocol (the record protocol
867 * may use arbitrary fragmentation and even interleaving):
868 * Change cipher spec protocol
869 * just 1 byte needed, no need for keeping anything stored
870 * Alert protocol
871 * 2 bytes needed (AlertLevel, AlertDescription)
872 * Handshake protocol
873 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
874 * to detect unexpected Client Hello and Hello Request messages
875 * here, anything else is handled by higher layers
876 * Application data protocol
877 * none of our business
878 */
879 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
880 {
881 int al,i,j,ret;
882 unsigned int n;
883 SSL3_RECORD *rr;
884 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
885
886 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
887 if (!ssl3_setup_read_buffer(s))
888 return(-1);
889
890 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
891 (peek && (type != SSL3_RT_APPLICATION_DATA)))
892 {
893 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
894 return -1;
895 }
896
897 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
898 /* (partially) satisfy request from storage */
899 {
900 unsigned char *src = s->s3->handshake_fragment;
901 unsigned char *dst = buf;
902 unsigned int k;
903
904 /* peek == 0 */
905 n = 0;
906 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
907 {
908 *dst++ = *src++;
909 len--; s->s3->handshake_fragment_len--;
910 n++;
911 }
912 /* move any remaining fragment bytes: */
913 for (k = 0; k < s->s3->handshake_fragment_len; k++)
914 s->s3->handshake_fragment[k] = *src++;
915 return n;
916 }
917
918 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
919
920 if (!s->in_handshake && SSL_in_init(s))
921 {
922 /* type == SSL3_RT_APPLICATION_DATA */
923 i=s->handshake_func(s);
924 if (i < 0) return(i);
925 if (i == 0)
926 {
927 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
928 return(-1);
929 }
930 }
931 start:
932 s->rwstate=SSL_NOTHING;
933
934 /* s->s3->rrec.type - is the type of record
935 * s->s3->rrec.data, - data
936 * s->s3->rrec.off, - offset into 'data' for next read
937 * s->s3->rrec.length, - number of bytes. */
938 rr = &(s->s3->rrec);
939
940 /* get new packet if necessary */
941 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
942 {
943 ret=ssl3_get_record(s);
944 if (ret <= 0) return(ret);
945 }
946
947 /* we now have a packet which can be read and processed */
948
949 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
950 * reset by ssl3_get_finished */
951 && (rr->type != SSL3_RT_HANDSHAKE))
952 {
953 al=SSL_AD_UNEXPECTED_MESSAGE;
954 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
955 goto f_err;
956 }
957
958 /* If the other end has shut down, throw anything we read away
959 * (even in 'peek' mode) */
960 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
961 {
962 rr->length=0;
963 s->rwstate=SSL_NOTHING;
964 return(0);
965 }
966
967
968 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
969 {
970 /* make sure that we are not getting application data when we
971 * are doing a handshake for the first time */
972 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
973 (s->enc_read_ctx == NULL))
974 {
975 al=SSL_AD_UNEXPECTED_MESSAGE;
976 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
977 goto f_err;
978 }
979
980 if (len <= 0) return(len);
981
982 if ((unsigned int)len > rr->length)
983 n = rr->length;
984 else
985 n = (unsigned int)len;
986
987 memcpy(buf,&(rr->data[rr->off]),n);
988 if (!peek)
989 {
990 rr->length-=n;
991 rr->off+=n;
992 if (rr->length == 0)
993 {
994 s->rstate=SSL_ST_READ_HEADER;
995 rr->off=0;
996 if (s->mode & SSL_MODE_RELEASE_BUFFERS)
997 ssl3_release_read_buffer(s);
998 }
999 }
1000 return(n);
1001 }
1002
1003
1004 /* If we get here, then type != rr->type; if we have a handshake
1005 * message, then it was unexpected (Hello Request or Client Hello). */
1006
1007 /* In case of record types for which we have 'fragment' storage,
1008 * fill that so that we can process the data at a fixed place.
1009 */
1010 {
1011 unsigned int dest_maxlen = 0;
1012 unsigned char *dest = NULL;
1013 unsigned int *dest_len = NULL;
1014
1015 if (rr->type == SSL3_RT_HANDSHAKE)
1016 {
1017 dest_maxlen = sizeof s->s3->handshake_fragment;
1018 dest = s->s3->handshake_fragment;
1019 dest_len = &s->s3->handshake_fragment_len;
1020 }
1021 else if (rr->type == SSL3_RT_ALERT)
1022 {
1023 dest_maxlen = sizeof s->s3->alert_fragment;
1024 dest = s->s3->alert_fragment;
1025 dest_len = &s->s3->alert_fragment_len;
1026 }
1027
1028 if (dest_maxlen > 0)
1029 {
1030 n = dest_maxlen - *dest_len; /* available space in 'dest' */
1031 if (rr->length < n)
1032 n = rr->length; /* available bytes */
1033
1034 /* now move 'n' bytes: */
1035 while (n-- > 0)
1036 {
1037 dest[(*dest_len)++] = rr->data[rr->off++];
1038 rr->length--;
1039 }
1040
1041 if (*dest_len < dest_maxlen)
1042 goto start; /* fragment was too small */
1043 }
1044 }
1045
1046 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
1047 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
1048 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1049
1050 /* If we are a client, check for an incoming 'Hello Request': */
1051 if ((!s->server) &&
1052 (s->s3->handshake_fragment_len >= 4) &&
1053 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1054 (s->session != NULL) && (s->session->cipher != NULL))
1055 {
1056 s->s3->handshake_fragment_len = 0;
1057
1058 if ((s->s3->handshake_fragment[1] != 0) ||
1059 (s->s3->handshake_fragment[2] != 0) ||
1060 (s->s3->handshake_fragment[3] != 0))
1061 {
1062 al=SSL_AD_DECODE_ERROR;
1063 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1064 goto f_err;
1065 }
1066
1067 if (s->msg_callback)
1068 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1069
1070 if (SSL_is_init_finished(s) &&
1071 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1072 !s->s3->renegotiate)
1073 {
1074 ssl3_renegotiate(s);
1075 if (ssl3_renegotiate_check(s))
1076 {
1077 i=s->handshake_func(s);
1078 if (i < 0) return(i);
1079 if (i == 0)
1080 {
1081 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1082 return(-1);
1083 }
1084
1085 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1086 {
1087 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1088 {
1089 BIO *bio;
1090 /* In the case where we try to read application data,
1091 * but we trigger an SSL handshake, we return -1 with
1092 * the retry option set. Otherwise renegotiation may
1093 * cause nasty problems in the blocking world */
1094 s->rwstate=SSL_READING;
1095 bio=SSL_get_rbio(s);
1096 BIO_clear_retry_flags(bio);
1097 BIO_set_retry_read(bio);
1098 return(-1);
1099 }
1100 }
1101 }
1102 }
1103 /* we either finished a handshake or ignored the request,
1104 * now try again to obtain the (application) data we were asked for */
1105 goto start;
1106 }
1107
1108 if (s->s3->alert_fragment_len >= 2)
1109 {
1110 int alert_level = s->s3->alert_fragment[0];
1111 int alert_descr = s->s3->alert_fragment[1];
1112
1113 s->s3->alert_fragment_len = 0;
1114
1115 if (s->msg_callback)
1116 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1117
1118 if (s->info_callback != NULL)
1119 cb=s->info_callback;
1120 else if (s->ctx->info_callback != NULL)
1121 cb=s->ctx->info_callback;
1122
1123 if (cb != NULL)
1124 {
1125 j = (alert_level << 8) | alert_descr;
1126 cb(s, SSL_CB_READ_ALERT, j);
1127 }
1128
1129 if (alert_level == 1) /* warning */
1130 {
1131 s->s3->warn_alert = alert_descr;
1132 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1133 {
1134 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1135 return(0);
1136 }
1137 }
1138 else if (alert_level == 2) /* fatal */
1139 {
1140 char tmp[16];
1141
1142 s->rwstate=SSL_NOTHING;
1143 s->s3->fatal_alert = alert_descr;
1144 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1145 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1146 ERR_add_error_data(2,"SSL alert number ",tmp);
1147 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1148 SSL_CTX_remove_session(s->ctx,s->session);
1149 return(0);
1150 }
1151 else
1152 {
1153 al=SSL_AD_ILLEGAL_PARAMETER;
1154 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1155 goto f_err;
1156 }
1157
1158 goto start;
1159 }
1160
1161 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1162 {
1163 s->rwstate=SSL_NOTHING;
1164 rr->length=0;
1165 return(0);
1166 }
1167
1168 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1169 {
1170 /* 'Change Cipher Spec' is just a single byte, so we know
1171 * exactly what the record payload has to look like */
1172 if ( (rr->length != 1) || (rr->off != 0) ||
1173 (rr->data[0] != SSL3_MT_CCS))
1174 {
1175 al=SSL_AD_ILLEGAL_PARAMETER;
1176 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1177 goto f_err;
1178 }
1179
1180 /* Check we have a cipher to change to */
1181 if (s->s3->tmp.new_cipher == NULL)
1182 {
1183 al=SSL_AD_UNEXPECTED_MESSAGE;
1184 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1185 goto f_err;
1186 }
1187
1188 rr->length=0;
1189
1190 if (s->msg_callback)
1191 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1192
1193 s->s3->change_cipher_spec=1;
1194 if (!ssl3_do_change_cipher_spec(s))
1195 goto err;
1196 else
1197 goto start;
1198 }
1199
1200 /* Unexpected handshake message (Client Hello, or protocol violation) */
1201 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1202 {
1203 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1204 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1205 {
1206 #if 0 /* worked only because C operator preferences are not as expected (and
1207 * because this is not really needed for clients except for detecting
1208 * protocol violations): */
1209 s->state=SSL_ST_BEFORE|(s->server)
1210 ?SSL_ST_ACCEPT
1211 :SSL_ST_CONNECT;
1212 #else
1213 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1214 #endif
1215 s->new_session=1;
1216 }
1217 i=s->handshake_func(s);
1218 if (i < 0) return(i);
1219 if (i == 0)
1220 {
1221 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1222 return(-1);
1223 }
1224
1225 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1226 {
1227 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1228 {
1229 BIO *bio;
1230 /* In the case where we try to read application data,
1231 * but we trigger an SSL handshake, we return -1 with
1232 * the retry option set. Otherwise renegotiation may
1233 * cause nasty problems in the blocking world */
1234 s->rwstate=SSL_READING;
1235 bio=SSL_get_rbio(s);
1236 BIO_clear_retry_flags(bio);
1237 BIO_set_retry_read(bio);
1238 return(-1);
1239 }
1240 }
1241 goto start;
1242 }
1243
1244 switch (rr->type)
1245 {
1246 default:
1247 #ifndef OPENSSL_NO_TLS
1248 /* TLS just ignores unknown message types */
1249 if (s->version == TLS1_VERSION)
1250 {
1251 rr->length = 0;
1252 goto start;
1253 }
1254 #endif
1255 al=SSL_AD_UNEXPECTED_MESSAGE;
1256 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1257 goto f_err;
1258 case SSL3_RT_CHANGE_CIPHER_SPEC:
1259 case SSL3_RT_ALERT:
1260 case SSL3_RT_HANDSHAKE:
1261 /* we already handled all of these, with the possible exception
1262 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1263 * should not happen when type != rr->type */
1264 al=SSL_AD_UNEXPECTED_MESSAGE;
1265 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1266 goto f_err;
1267 case SSL3_RT_APPLICATION_DATA:
1268 /* At this point, we were expecting handshake data,
1269 * but have application data. If the library was
1270 * running inside ssl3_read() (i.e. in_read_app_data
1271 * is set) and it makes sense to read application data
1272 * at this point (session renegotiation not yet started),
1273 * we will indulge it.
1274 */
1275 if (s->s3->in_read_app_data &&
1276 (s->s3->total_renegotiations != 0) &&
1277 ((
1278 (s->state & SSL_ST_CONNECT) &&
1279 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1280 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1281 ) || (
1282 (s->state & SSL_ST_ACCEPT) &&
1283 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1284 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1285 )
1286 ))
1287 {
1288 s->s3->in_read_app_data=2;
1289 return(-1);
1290 }
1291 else
1292 {
1293 al=SSL_AD_UNEXPECTED_MESSAGE;
1294 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1295 goto f_err;
1296 }
1297 }
1298 /* not reached */
1299
1300 f_err:
1301 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1302 err:
1303 return(-1);
1304 }
1305
1306 int ssl3_do_change_cipher_spec(SSL *s)
1307 {
1308 int i;
1309 const char *sender;
1310 int slen;
1311
1312 if (s->state & SSL_ST_ACCEPT)
1313 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1314 else
1315 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1316
1317 if (s->s3->tmp.key_block == NULL)
1318 {
1319 if (s->session == NULL)
1320 {
1321 /* might happen if dtls1_read_bytes() calls this */
1322 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1323 return (0);
1324 }
1325
1326 s->session->cipher=s->s3->tmp.new_cipher;
1327 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1328 }
1329
1330 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1331 return(0);
1332
1333 /* we have to record the message digest at
1334 * this point so we can get it before we read
1335 * the finished message */
1336 if (s->state & SSL_ST_CONNECT)
1337 {
1338 sender=s->method->ssl3_enc->server_finished_label;
1339 slen=s->method->ssl3_enc->server_finished_label_len;
1340 }
1341 else
1342 {
1343 sender=s->method->ssl3_enc->client_finished_label;
1344 slen=s->method->ssl3_enc->client_finished_label_len;
1345 }
1346
1347 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1348 sender,slen,s->s3->tmp.peer_finish_md);
1349
1350 return(1);
1351 }
1352
1353 int ssl3_send_alert(SSL *s, int level, int desc)
1354 {
1355 /* Map tls/ssl alert value to correct one */
1356 desc=s->method->ssl3_enc->alert_value(desc);
1357 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1358 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1359 if (desc < 0) return -1;
1360 /* If a fatal one, remove from cache */
1361 if ((level == 2) && (s->session != NULL))
1362 SSL_CTX_remove_session(s->ctx,s->session);
1363
1364 s->s3->alert_dispatch=1;
1365 s->s3->send_alert[0]=level;
1366 s->s3->send_alert[1]=desc;
1367 if (s->s3->wbuf.left == 0) /* data still being written out? */
1368 return s->method->ssl_dispatch_alert(s);
1369 /* else data is still being written out, we will get written
1370 * some time in the future */
1371 return -1;
1372 }
1373
1374 int ssl3_dispatch_alert(SSL *s)
1375 {
1376 int i,j;
1377 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1378
1379 s->s3->alert_dispatch=0;
1380 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1381 if (i <= 0)
1382 {
1383 s->s3->alert_dispatch=1;
1384 }
1385 else
1386 {
1387 /* Alert sent to BIO. If it is important, flush it now.
1388 * If the message does not get sent due to non-blocking IO,
1389 * we will not worry too much. */
1390 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1391 (void)BIO_flush(s->wbio);
1392
1393 if (s->msg_callback)
1394 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1395
1396 if (s->info_callback != NULL)
1397 cb=s->info_callback;
1398 else if (s->ctx->info_callback != NULL)
1399 cb=s->ctx->info_callback;
1400
1401 if (cb != NULL)
1402 {
1403 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1404 cb(s,SSL_CB_WRITE_ALERT,j);
1405 }
1406 }
1407 return(i);
1408 }