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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) 1998-1999 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 <openssl/evp.h>
116 #include <openssl/buffer.h>
117 #include "ssl_locl.h"
118
119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
120 unsigned int len);
121 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
122 unsigned int len);
123 static int ssl3_get_record(SSL *s);
124 static int do_compress(SSL *ssl);
125 static int do_uncompress(SSL *ssl);
126 static int do_change_cipher_spec(SSL *ssl);
127
128 /* used only by ssl3_get_record */
129 static int ssl3_read_n(SSL *s, int n, int max, int extend)
130 {
131 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
132 * packet by another n bytes.
133 * The packet will be in the sub-array of s->s3->rbuf.buf specified
134 * by s->packet and s->packet_length.
135 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
136 * [plus s->packet_length bytes if extend == 1].)
137 */
138 int i,off,newb;
139
140 if (!extend)
141 {
142 /* start with empty packet ... */
143 if (s->s3->rbuf.left == 0)
144 s->s3->rbuf.offset = 0;
145 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
146 s->packet_length = 0;
147 /* ... now we can act as if 'extend' was set */
148 }
149
150 /* if there is enough in the buffer from a previous read, take some */
151 if (s->s3->rbuf.left >= (int)n)
152 {
153 s->packet_length+=n;
154 s->s3->rbuf.left-=n;
155 s->s3->rbuf.offset+=n;
156 return(n);
157 }
158
159 /* else we need to read more data */
160 if (!s->read_ahead)
161 max=n;
162
163 {
164 /* avoid buffer overflow */
165 int max_max = SSL3_RT_MAX_PACKET_SIZE - s->packet_length;
166 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
167 max_max += SSL3_RT_MAX_EXTRA;
168 if (max > max_max)
169 max = max_max;
170 }
171 if (n > max) /* does not happen */
172 {
173 SSLerr(SSL_F_SSL3_READ_N,SSL_R_INTERNAL_ERROR);
174 return -1;
175 }
176
177 off = s->packet_length;
178 newb = s->s3->rbuf.left;
179 /* Move any available bytes to front of buffer:
180 * 'off' bytes already pointed to by 'packet',
181 * 'newb' extra ones at the end */
182 if (s->packet != s->s3->rbuf.buf)
183 {
184 /* off > 0 */
185 memmove(s->s3->rbuf.buf, s->packet, off+newb);
186 s->packet = s->s3->rbuf.buf;
187 }
188
189 while (newb < n)
190 {
191 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
192 * to read in more until we have off+n (up to off+max if possible) */
193
194 clear_sys_error();
195 if (s->rbio != NULL)
196 {
197 s->rwstate=SSL_READING;
198 i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb);
199 }
200 else
201 {
202 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
203 i = -1;
204 }
205
206 if (i <= 0)
207 {
208 s->s3->rbuf.left = newb;
209 return(i);
210 }
211 newb+=i;
212 }
213
214 /* done reading, now the book-keeping */
215 s->s3->rbuf.offset = off + n;
216 s->s3->rbuf.left = newb - n;
217 s->packet_length += n;
218 s->rwstate=SSL_NOTHING;
219 return(n);
220 }
221
222 /* Call this to get a new input record.
223 * It will return <= 0 if more data is needed, normally due to an error
224 * or non-blocking IO.
225 * When it finishes, one packet has been decoded and can be found in
226 * ssl->s3->rrec.type - is the type of record
227 * ssl->s3->rrec.data, - data
228 * ssl->s3->rrec.length, - number of bytes
229 */
230 /* used only by ssl3_read_bytes */
231 static int ssl3_get_record(SSL *s)
232 {
233 int ssl_major,ssl_minor,al;
234 int n,i,ret= -1;
235 SSL3_RECORD *rr;
236 SSL_SESSION *sess;
237 unsigned char *p;
238 unsigned char md[EVP_MAX_MD_SIZE];
239 short version;
240 unsigned int mac_size;
241 int clear=0,extra;
242
243 rr= &(s->s3->rrec);
244 sess=s->session;
245
246 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
247 extra=SSL3_RT_MAX_EXTRA;
248 else
249 extra=0;
250
251 again:
252 /* check if we have the header */
253 if ( (s->rstate != SSL_ST_READ_BODY) ||
254 (s->packet_length < SSL3_RT_HEADER_LENGTH))
255 {
256 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
257 SSL3_RT_MAX_PACKET_SIZE,0);
258 if (n <= 0) return(n); /* error or non-blocking */
259 s->rstate=SSL_ST_READ_BODY;
260
261 p=s->packet;
262
263 /* Pull apart the header into the SSL3_RECORD */
264 rr->type= *(p++);
265 ssl_major= *(p++);
266 ssl_minor= *(p++);
267 version=(ssl_major<<8)|ssl_minor;
268 n2s(p,rr->length);
269
270 /* Lets check version */
271 if (s->first_packet)
272 {
273 s->first_packet=0;
274 }
275 else
276 {
277 if (version != s->version)
278 {
279 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
280 /* Send back error using their
281 * version number :-) */
282 s->version=version;
283 al=SSL_AD_PROTOCOL_VERSION;
284 goto f_err;
285 }
286 }
287
288 if ((version>>8) != SSL3_VERSION_MAJOR)
289 {
290 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
291 goto err;
292 }
293
294 if (rr->length >
295 (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
296 {
297 al=SSL_AD_RECORD_OVERFLOW;
298 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
299 goto f_err;
300 }
301
302 /* now s->rstate == SSL_ST_READ_BODY */
303 }
304
305 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
306
307 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
308 {
309 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
310 i=rr->length;
311 n=ssl3_read_n(s,i,i,1);
312 if (n <= 0) return(n); /* error or non-blocking io */
313 /* now n == rr->length,
314 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
315 }
316
317 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
318
319 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
320 * and we have that many bytes in s->packet
321 */
322 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
323
324 /* ok, we can now read from 's->packet' data into 'rr'
325 * rr->input points at rr->length bytes, which
326 * need to be copied into rr->data by either
327 * the decryption or by the decompression
328 * When the data is 'copied' into the rr->data buffer,
329 * rr->input will be pointed at the new buffer */
330
331 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
332 * rr->length bytes of encrypted compressed stuff. */
333
334 /* check is not needed I believe */
335 if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
336 {
337 al=SSL_AD_RECORD_OVERFLOW;
338 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
339 goto f_err;
340 }
341
342 /* decrypt in place in 'rr->input' */
343 rr->data=rr->input;
344
345 if (!s->method->ssl3_enc->enc(s,0))
346 {
347 al=SSL_AD_DECRYPT_ERROR;
348 goto f_err;
349 }
350 #ifdef TLS_DEBUG
351 printf("dec %d\n",rr->length);
352 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
353 printf("\n");
354 #endif
355 /* r->length is now the compressed data plus mac */
356 if ( (sess == NULL) ||
357 (s->enc_read_ctx == NULL) ||
358 (s->read_hash == NULL))
359 clear=1;
360
361 if (!clear)
362 {
363 mac_size=EVP_MD_size(s->read_hash);
364
365 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
366 {
367 al=SSL_AD_RECORD_OVERFLOW;
368 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
369 goto f_err;
370 }
371 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
372 if (rr->length < mac_size)
373 {
374 al=SSL_AD_DECODE_ERROR;
375 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
376 goto f_err;
377 }
378 rr->length-=mac_size;
379 i=s->method->ssl3_enc->mac(s,md,0);
380 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
381 {
382 al=SSL_AD_BAD_RECORD_MAC;
383 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
384 ret= -1;
385 goto f_err;
386 }
387 }
388
389 /* r->length is now just compressed */
390 if (s->expand != NULL)
391 {
392 if (rr->length >
393 (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
394 {
395 al=SSL_AD_RECORD_OVERFLOW;
396 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
397 goto f_err;
398 }
399 if (!do_uncompress(s))
400 {
401 al=SSL_AD_DECOMPRESSION_FAILURE;
402 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
403 goto f_err;
404 }
405 }
406
407 if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
408 {
409 al=SSL_AD_RECORD_OVERFLOW;
410 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
411 goto f_err;
412 }
413
414 rr->off=0;
415 /* So at this point the following is true
416 * ssl->s3->rrec.type is the type of record
417 * ssl->s3->rrec.length == number of bytes in record
418 * ssl->s3->rrec.off == offset to first valid byte
419 * ssl->s3->rrec.data == where to take bytes from, increment
420 * after use :-).
421 */
422
423 /* we have pulled in a full packet so zero things */
424 s->packet_length=0;
425
426 /* just read a 0 length packet */
427 if (rr->length == 0) goto again;
428
429 return(1);
430 f_err:
431 ssl3_send_alert(s,SSL3_AL_FATAL,al);
432 err:
433 return(ret);
434 }
435
436 static int do_uncompress(SSL *ssl)
437 {
438 int i;
439 SSL3_RECORD *rr;
440
441 rr= &(ssl->s3->rrec);
442 i=COMP_expand_block(ssl->expand,rr->comp,
443 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
444 if (i < 0)
445 return(0);
446 else
447 rr->length=i;
448 rr->data=rr->comp;
449
450 return(1);
451 }
452
453 static int do_compress(SSL *ssl)
454 {
455 int i;
456 SSL3_RECORD *wr;
457
458 wr= &(ssl->s3->wrec);
459 i=COMP_compress_block(ssl->compress,wr->data,
460 SSL3_RT_MAX_COMPRESSED_LENGTH,
461 wr->input,(int)wr->length);
462 if (i < 0)
463 return(0);
464 else
465 wr->length=i;
466
467 wr->input=wr->data;
468 return(1);
469 }
470
471 /* Call this to write data in records of type 'type'
472 * It will return <= 0 if not all data has been sent or non-blocking IO.
473 */
474 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
475 {
476 const unsigned char *buf=buf_;
477 unsigned int tot,n,nw;
478 int i;
479
480 s->rwstate=SSL_NOTHING;
481 tot=s->s3->wnum;
482 s->s3->wnum=0;
483
484 if (SSL_in_init(s) && !s->in_handshake)
485 {
486 i=s->handshake_func(s);
487 if (i < 0) return(i);
488 if (i == 0)
489 {
490 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
491 return(-1);
492 }
493 }
494
495 n=(len-tot);
496 for (;;)
497 {
498 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
499 nw=SSL3_RT_MAX_PLAIN_LENGTH;
500 else
501 nw=n;
502
503 i=do_ssl3_write(s,type,&(buf[tot]),nw);
504 if (i <= 0)
505 {
506 s->s3->wnum=tot;
507 return(i);
508 }
509
510 if ((i == (int)n) ||
511 (type == SSL3_RT_APPLICATION_DATA &&
512 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
513 {
514 return(tot+i);
515 }
516
517 n-=i;
518 tot+=i;
519 }
520 }
521
522 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
523 unsigned int len)
524 {
525 unsigned char *p,*plen;
526 int i,mac_size,clear=0;
527 SSL3_RECORD *wr;
528 SSL3_BUFFER *wb;
529 SSL_SESSION *sess;
530
531 /* first check is there is a SSL3_RECORD still being written
532 * out. This will happen with non blocking IO */
533 if (s->s3->wbuf.left != 0)
534 return(ssl3_write_pending(s,type,buf,len));
535
536 /* If we have an alert to send, lets send it */
537 if (s->s3->alert_dispatch)
538 {
539 i=ssl3_dispatch_alert(s);
540 if (i <= 0)
541 return(i);
542 /* if it went, fall through and send more stuff */
543 }
544
545 if (len == 0) return(len);
546
547 wr= &(s->s3->wrec);
548 wb= &(s->s3->wbuf);
549 sess=s->session;
550
551 if ( (sess == NULL) ||
552 (s->enc_write_ctx == NULL) ||
553 (s->write_hash == NULL))
554 clear=1;
555
556 if (clear)
557 mac_size=0;
558 else
559 mac_size=EVP_MD_size(s->write_hash);
560
561 p=wb->buf;
562
563 /* write the header */
564 *(p++)=type&0xff;
565 wr->type=type;
566
567 *(p++)=(s->version>>8);
568 *(p++)=s->version&0xff;
569
570 /* record where we are to write out packet length */
571 plen=p;
572 p+=2;
573
574 /* lets setup the record stuff. */
575 wr->data=p;
576 wr->length=(int)len;
577 wr->input=(unsigned char *)buf;
578
579 /* we now 'read' from wr->input, wr->length bytes into
580 * wr->data */
581
582 /* first we compress */
583 if (s->compress != NULL)
584 {
585 if (!do_compress(s))
586 {
587 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
588 goto err;
589 }
590 }
591 else
592 {
593 memcpy(wr->data,wr->input,wr->length);
594 wr->input=wr->data;
595 }
596
597 /* we should still have the output to wr->data and the input
598 * from wr->input. Length should be wr->length.
599 * wr->data still points in the wb->buf */
600
601 if (mac_size != 0)
602 {
603 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
604 wr->length+=mac_size;
605 wr->input=p;
606 wr->data=p;
607 }
608
609 /* ssl3_enc can only have an error on read */
610 s->method->ssl3_enc->enc(s,1);
611
612 /* record length after mac and block padding */
613 s2n(wr->length,plen);
614
615 /* we should now have
616 * wr->data pointing to the encrypted data, which is
617 * wr->length long */
618 wr->type=type; /* not needed but helps for debugging */
619 wr->length+=SSL3_RT_HEADER_LENGTH;
620
621 /* Now lets setup wb */
622 wb->left=wr->length;
623 wb->offset=0;
624
625 s->s3->wpend_tot=len;
626 s->s3->wpend_buf=buf;
627 s->s3->wpend_type=type;
628 s->s3->wpend_ret=len;
629
630 /* we now just need to write the buffer */
631 return(ssl3_write_pending(s,type,buf,len));
632 err:
633 return(-1);
634 }
635
636 /* if s->s3->wbuf.left != 0, we need to call this */
637 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
638 unsigned int len)
639 {
640 int i;
641
642 /* XXXX */
643 if ((s->s3->wpend_tot > (int)len)
644 || ((s->s3->wpend_buf != buf) &&
645 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
646 || (s->s3->wpend_type != type))
647 {
648 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
649 return(-1);
650 }
651
652 for (;;)
653 {
654 clear_sys_error();
655 if (s->wbio != NULL)
656 {
657 s->rwstate=SSL_WRITING;
658 i=BIO_write(s->wbio,
659 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
660 (unsigned int)s->s3->wbuf.left);
661 }
662 else
663 {
664 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
665 i= -1;
666 }
667 if (i == s->s3->wbuf.left)
668 {
669 s->s3->wbuf.left=0;
670 s->rwstate=SSL_NOTHING;
671 return(s->s3->wpend_ret);
672 }
673 else if (i <= 0)
674 return(i);
675 s->s3->wbuf.offset+=i;
676 s->s3->wbuf.left-=i;
677 }
678 }
679
680 /* Return up to 'len' payload bytes received in 'type' records.
681 * 'type' is one of the following:
682 *
683 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
684 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
685 * - 0 (during a shutdown, no data has to be returned)
686 *
687 * If we don't have stored data to work from, read a SSL/TLS record first
688 * (possibly multiple records if we still don't have anything to return).
689 *
690 * This function must handle any surprises the peer may have for us, such as
691 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
692 * a surprise, but handled as if it were), or renegotiation requests.
693 * Also if record payloads contain fragments too small to process, we store
694 * them until there is enough for the respective protocol (the record protocol
695 * may use arbitrary fragmentation and even interleaving):
696 * Change cipher spec protocol
697 * just 1 byte needed, no need for keeping anything stored
698 * Alert protocol
699 * 2 bytes needed (AlertLevel, AlertDescription)
700 * Handshake protocol
701 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
702 * to detect unexpected Client Hello and Hello Request messages
703 * here, anything else is handled by higher layers
704 * Application data protocol
705 * none of our business
706 */
707 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len)
708 {
709 int al,i,j,n,ret;
710 SSL3_RECORD *rr;
711 void (*cb)()=NULL;
712
713 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
714 if (!ssl3_setup_buffers(s))
715 return(-1);
716
717 if ((type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type)
718 {
719 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_INTERNAL_ERROR);
720 return -1;
721 }
722
723 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
724 /* (partially) satisfy request from storage */
725 {
726 unsigned char *src = s->s3->handshake_fragment;
727 unsigned char *dst = buf;
728
729 n = 0;
730 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
731 {
732 *dst++ = *src++;
733 len--; s->s3->handshake_fragment_len--;
734 n++;
735 }
736 /* move any remaining fragment bytes: */
737 for (i = 0; i < s->s3->handshake_fragment_len; i++)
738 s->s3->handshake_fragment[i] = *src++;
739 return n;
740 }
741
742 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
743
744 if (!s->in_handshake && SSL_in_init(s))
745 {
746 /* type == SSL3_RT_APPLICATION_DATA */
747 i=s->handshake_func(s);
748 if (i < 0) return(i);
749 if (i == 0)
750 {
751 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
752 return(-1);
753 }
754 }
755 start:
756 s->rwstate=SSL_NOTHING;
757
758 /* s->s3->rrec.type - is the type of record
759 * s->s3->rrec.data, - data
760 * s->s3->rrec.off, - offset into 'data' for next read
761 * s->s3->rrec.length, - number of bytes. */
762 rr = &(s->s3->rrec);
763
764 /* get new packet */
765 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
766 {
767 ret=ssl3_get_record(s);
768 if (ret <= 0) return(ret);
769 }
770
771 /* we now have a packet which can be read and processed */
772
773 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
774 * reset by ssl3_get_finished */
775 && (rr->type != SSL3_RT_HANDSHAKE))
776 {
777 al=SSL_AD_UNEXPECTED_MESSAGE;
778 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
779 goto err;
780 }
781
782 /* If the other end has shutdown, throw anything we read away */
783 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
784 {
785 rr->length=0;
786 s->rwstate=SSL_NOTHING;
787 return(0);
788 }
789
790
791 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
792 {
793 /* make sure that we are not getting application data when we
794 * are doing a handshake for the first time */
795 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
796 (s->enc_read_ctx == NULL))
797 {
798 al=SSL_AD_UNEXPECTED_MESSAGE;
799 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
800 goto f_err;
801 }
802
803 if (len <= 0) return(len);
804
805 if ((unsigned int)len > rr->length)
806 n=rr->length;
807 else
808 n=len;
809
810 memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
811 rr->length-=n;
812 rr->off+=n;
813 if (rr->length == 0)
814 {
815 s->rstate=SSL_ST_READ_HEADER;
816 rr->off=0;
817 }
818 return(n);
819 }
820
821
822 /* If we get here, then type != rr->type; if we have a handshake
823 * message, then it was unexpected (Hello Request or Client Hello). */
824
825 /* In case of record types for which we have 'fragment' storage,
826 * fill that so that we can process the data at a fixed place.
827 */
828 {
829 int dest_maxlen = 0;
830 unsigned char *dest = NULL;
831 int *dest_len = NULL;
832
833 if (rr->type == SSL3_RT_HANDSHAKE)
834 {
835 dest_maxlen = sizeof s->s3->handshake_fragment;
836 dest = s->s3->handshake_fragment;
837 dest_len = &s->s3->handshake_fragment_len;
838 }
839 else if (rr->type == SSL3_RT_ALERT)
840 {
841 dest_maxlen = sizeof s->s3->alert_fragment;
842 dest = s->s3->alert_fragment;
843 dest_len = &s->s3->alert_fragment_len;
844 }
845
846 if (dest_maxlen > 0)
847 {
848 n = dest_maxlen - *dest_len; /* available space in 'dest' */
849 if (rr->length < (unsigned int) n)
850 n = rr->length; /* available bytes */
851
852 /* now move 'n' bytes: */
853 while (n-- > 0)
854 {
855 dest[(*dest_len)++] = rr->data[rr->off++];
856 rr->length--;
857 }
858
859 if (*dest_len < dest_maxlen)
860 goto start; /* fragment was too small */
861 }
862 }
863
864 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
865 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
866 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
867
868 /* If we are a client, check for an incoming 'Hello Request': */
869 if ((!s->server) &&
870 (s->s3->handshake_fragment_len >= 4) &&
871 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
872 (s->session != NULL) && (s->session->cipher != NULL))
873 {
874 s->s3->handshake_fragment_len = 0;
875
876 if ((s->s3->handshake_fragment[1] != 0) ||
877 (s->s3->handshake_fragment[2] != 0) ||
878 (s->s3->handshake_fragment[3] != 0))
879 {
880 al=SSL_AD_DECODE_ERROR;
881 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
882 goto err;
883 }
884
885 if (SSL_is_init_finished(s) &&
886 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
887 !s->s3->renegotiate)
888 {
889 ssl3_renegotiate(s);
890 if (ssl3_renegotiate_check(s))
891 {
892 n=s->handshake_func(s);
893 if (n < 0) return(n);
894 if (n == 0)
895 {
896 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
897 return(-1);
898 }
899
900 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
901 {
902 BIO *bio;
903 /* In the case where we try to read application data
904 * the first time, but we trigger an SSL handshake, we
905 * return -1 with the retry option set. I do this
906 * otherwise renegotiation can cause nasty problems
907 * in the blocking world */ /* ? */
908 s->rwstate=SSL_READING;
909 bio=SSL_get_rbio(s);
910 BIO_clear_retry_flags(bio);
911 BIO_set_retry_read(bio);
912 return(-1);
913 }
914 }
915 }
916 /* we either finished a handshake or ignored the request,
917 * now try again to obtain the (application) data we were asked for */
918 goto start;
919 }
920
921 if (s->s3->alert_fragment_len >= 2)
922 {
923 i = s->s3->alert_fragment[0];
924 n = s->s3->alert_fragment[1];
925
926 s->s3->alert_fragment_len = 0;
927
928 if (s->info_callback != NULL)
929 cb=s->info_callback;
930 else if (s->ctx->info_callback != NULL)
931 cb=s->ctx->info_callback;
932
933 if (cb != NULL)
934 {
935 j=(i<<8)|n;
936 cb(s,SSL_CB_READ_ALERT,j);
937 }
938
939 if (i == 1) /* warning */
940 {
941 s->s3->warn_alert=n;
942 if (n == SSL_AD_CLOSE_NOTIFY)
943 {
944 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
945 return(0);
946 }
947 }
948 else if (i == 2) /* fatal */
949 {
950 char tmp[16];
951
952 s->rwstate=SSL_NOTHING;
953 s->s3->fatal_alert=n;
954 SSLerr(SSL_F_SSL3_READ_BYTES,
955 SSL_AD_REASON_OFFSET+n);
956 sprintf(tmp,"%d",n);
957 ERR_add_error_data(2,"SSL alert number ",tmp);
958 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
959 SSL_CTX_remove_session(s->ctx,s->session);
960 return(0);
961 }
962 else
963 {
964 al=SSL_AD_ILLEGAL_PARAMETER;
965 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
966 goto f_err;
967 }
968
969 goto start;
970 }
971
972 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
973 {
974 s->rwstate=SSL_NOTHING;
975 rr->length=0;
976 return(0);
977 }
978
979 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
980 {
981 /* 'Change Cipher Spec' is just a single byte, so we know
982 * exactly what the record payload has to look like */
983 if ( (rr->length != 1) || (rr->off != 0) ||
984 (rr->data[0] != SSL3_MT_CCS))
985 {
986 i=SSL_AD_ILLEGAL_PARAMETER;
987 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
988 goto err;
989 }
990
991 rr->length=0;
992 s->s3->change_cipher_spec=1;
993 if (!do_change_cipher_spec(s))
994 goto err;
995 else
996 goto start;
997 }
998
999 /* Unexpected handshake message (Client Hello, or protocol violation) */
1000 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1001 {
1002 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1003 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1004 {
1005 #if 0 /* worked only because C operator preferences are not as expected (and
1006 * because this is not really needed for clients except for detecting
1007 * protocol violations): */
1008 s->state=SSL_ST_BEFORE|(s->server)
1009 ?SSL_ST_ACCEPT
1010 :SSL_ST_CONNECT;
1011 #else
1012 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1013 #endif
1014 s->new_session=1;
1015 }
1016 n=s->handshake_func(s);
1017 if (n < 0) return(n);
1018 if (n == 0)
1019 {
1020 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1021 return(-1);
1022 }
1023
1024 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1025 {
1026 BIO *bio;
1027 /* In the case where we try to read application data
1028 * the first time, but we trigger an SSL handshake, we
1029 * return -1 with the retry option set. I do this
1030 * otherwise renegotiation can cause nasty problems
1031 * in the blocking world */ /* ? */
1032 s->rwstate=SSL_READING;
1033 bio=SSL_get_rbio(s);
1034 BIO_clear_retry_flags(bio);
1035 BIO_set_retry_read(bio);
1036 return(-1);
1037 }
1038 goto start;
1039 }
1040
1041 switch (rr->type)
1042 {
1043 default:
1044 #ifndef NO_TLS
1045 /* TLS just ignores unknown message types */
1046 if (s->version == TLS1_VERSION)
1047 {
1048 goto start;
1049 }
1050 #endif
1051 al=SSL_AD_UNEXPECTED_MESSAGE;
1052 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1053 goto f_err;
1054 case SSL3_RT_CHANGE_CIPHER_SPEC:
1055 case SSL3_RT_ALERT:
1056 case SSL3_RT_HANDSHAKE:
1057 /* we already handled all of these, with the possible exception
1058 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1059 * should not happen when type != rr->type */
1060 al=SSL_AD_UNEXPECTED_MESSAGE;
1061 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_INTERNAL_ERROR);
1062 goto f_err;
1063 case SSL3_RT_APPLICATION_DATA:
1064 /* At this point, we were expecting handshake data,
1065 * but have application data. If the library was
1066 * running inside ssl3_read() (i.e. in_read_app_data
1067 * is set) and it makes sense to read application data
1068 * at this point (session renegotiation not yet started),
1069 * we will indulge it.
1070 */
1071 if (s->s3->in_read_app_data &&
1072 (s->s3->total_renegotiations != 0) &&
1073 ((
1074 (s->state & SSL_ST_CONNECT) &&
1075 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1076 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1077 ) || (
1078 (s->state & SSL_ST_ACCEPT) &&
1079 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1080 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1081 )
1082 ))
1083 {
1084 s->s3->in_read_app_data=0;
1085 return(-1);
1086 }
1087 else
1088 {
1089 al=SSL_AD_UNEXPECTED_MESSAGE;
1090 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1091 goto f_err;
1092 }
1093 }
1094 /* not reached */
1095
1096 f_err:
1097 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1098 err:
1099 return(-1);
1100 }
1101
1102 static int do_change_cipher_spec(SSL *s)
1103 {
1104 int i;
1105 const char *sender;
1106 int slen;
1107
1108 if (s->state & SSL_ST_ACCEPT)
1109 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1110 else
1111 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1112
1113 if (s->s3->tmp.key_block == NULL)
1114 {
1115 s->session->cipher=s->s3->tmp.new_cipher;
1116 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1117 }
1118
1119 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1120 return(0);
1121
1122 /* we have to record the message digest at
1123 * this point so we can get it before we read
1124 * the finished message */
1125 if (s->state & SSL_ST_CONNECT)
1126 {
1127 sender=s->method->ssl3_enc->server_finished_label;
1128 slen=s->method->ssl3_enc->server_finished_label_len;
1129 }
1130 else
1131 {
1132 sender=s->method->ssl3_enc->client_finished_label;
1133 slen=s->method->ssl3_enc->client_finished_label_len;
1134 }
1135
1136 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1137 &(s->s3->finish_dgst1),
1138 &(s->s3->finish_dgst2),
1139 sender,slen,s->s3->tmp.peer_finish_md);
1140
1141 return(1);
1142 }
1143
1144 void ssl3_send_alert(SSL *s, int level, int desc)
1145 {
1146 /* Map tls/ssl alert value to correct one */
1147 desc=s->method->ssl3_enc->alert_value(desc);
1148 if (desc < 0) return;
1149 /* If a fatal one, remove from cache */
1150 if ((level == 2) && (s->session != NULL))
1151 SSL_CTX_remove_session(s->ctx,s->session);
1152
1153 s->s3->alert_dispatch=1;
1154 s->s3->send_alert[0]=level;
1155 s->s3->send_alert[1]=desc;
1156 if (s->s3->wbuf.left == 0) /* data still being written out */
1157 ssl3_dispatch_alert(s);
1158 /* else data is still being written out, we will get written
1159 * some time in the future */
1160 }
1161
1162 int ssl3_dispatch_alert(SSL *s)
1163 {
1164 int i,j;
1165 void (*cb)()=NULL;
1166
1167 s->s3->alert_dispatch=0;
1168 i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1169 if (i <= 0)
1170 {
1171 s->s3->alert_dispatch=1;
1172 }
1173 else
1174 {
1175 /* If it is important, send it now. If the message
1176 * does not get sent due to non-blocking IO, we will
1177 * not worry too much. */
1178 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1179 (void)BIO_flush(s->wbio);
1180
1181 if (s->info_callback != NULL)
1182 cb=s->info_callback;
1183 else if (s->ctx->info_callback != NULL)
1184 cb=s->ctx->info_callback;
1185
1186 if (cb != NULL)
1187 {
1188 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1189 cb(s,SSL_CB_WRITE_ALERT,j);
1190 }
1191 }
1192 return(i);
1193 }
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