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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) 1998-2000 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
119static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
120 unsigned int len);
121static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
122 unsigned int len);
123static int ssl3_get_record(SSL *s);
124static int do_compress(SSL *ssl);
125static int do_uncompress(SSL *ssl);
126static int do_change_cipher_spec(SSL *ssl);
127
128/* used only by ssl3_get_record */
129static 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 */
231static 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
251again:
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
351printf("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'); }
353printf("\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);
430f_err:
431 ssl3_send_alert(s,SSL3_AL_FATAL,al);
432err:
433 return(ret);
434 }
435
436static 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
453static 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 */
474int 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
522static 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));
632err:
633 return(-1);
634 }
635
636/* if s->s3->wbuf.left != 0, we need to call this */
637static 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 */
707int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
708 {
709 int al,i,j,ret;
710 unsigned int n;
711 SSL3_RECORD *rr;
712 void (*cb)()=NULL;
713
714 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
715 if (!ssl3_setup_buffers(s))
716 return(-1);
717
718 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
719 (peek && (type != SSL3_RT_APPLICATION_DATA)))
720 {
721 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_INTERNAL_ERROR);
722 return -1;
723 }
724
725 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
726 /* (partially) satisfy request from storage */
727 {
728 unsigned char *src = s->s3->handshake_fragment;
729 unsigned char *dst = buf;
730 unsigned int k;
731
732 /* peek == 0 */
733 n = 0;
734 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
735 {
736 *dst++ = *src++;
737 len--; s->s3->handshake_fragment_len--;
738 n++;
739 }
740 /* move any remaining fragment bytes: */
741 for (k = 0; k < s->s3->handshake_fragment_len; k++)
742 s->s3->handshake_fragment[k] = *src++;
743 return n;
744 }
745
746 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
747
748 if (!s->in_handshake && SSL_in_init(s))
749 {
750 /* type == SSL3_RT_APPLICATION_DATA */
751 i=s->handshake_func(s);
752 if (i < 0) return(i);
753 if (i == 0)
754 {
755 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
756 return(-1);
757 }
758 }
759start:
760 s->rwstate=SSL_NOTHING;
761
762 /* s->s3->rrec.type - is the type of record
763 * s->s3->rrec.data, - data
764 * s->s3->rrec.off, - offset into 'data' for next read
765 * s->s3->rrec.length, - number of bytes. */
766 rr = &(s->s3->rrec);
767
768 /* get new packet if necessary */
769 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
770 {
771 ret=ssl3_get_record(s);
772 if (ret <= 0) return(ret);
773 }
774
775 /* we now have a packet which can be read and processed */
776
777 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
778 * reset by ssl3_get_finished */
779 && (rr->type != SSL3_RT_HANDSHAKE))
780 {
781 al=SSL_AD_UNEXPECTED_MESSAGE;
782 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
783 goto err;
784 }
785
786 /* If the other end has shut down, throw anything we read away
787 * (even in 'peek' mode) */
788 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
789 {
790 rr->length=0;
791 s->rwstate=SSL_NOTHING;
792 return(0);
793 }
794
795
796 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
797 {
798 /* make sure that we are not getting application data when we
799 * are doing a handshake for the first time */
800 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
801 (s->enc_read_ctx == NULL))
802 {
803 al=SSL_AD_UNEXPECTED_MESSAGE;
804 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
805 goto f_err;
806 }
807
808 if (len <= 0) return(len);
809
810 if ((unsigned int)len > rr->length)
811 n = rr->length;
812 else
813 n = (unsigned int)len;
814
815 memcpy(buf,&(rr->data[rr->off]),n);
816 if (!peek)
817 {
818 rr->length-=n;
819 rr->off+=n;
820 if (rr->length == 0)
821 {
822 s->rstate=SSL_ST_READ_HEADER;
823 rr->off=0;
824 }
825 }
826 return(n);
827 }
828
829
830 /* If we get here, then type != rr->type; if we have a handshake
831 * message, then it was unexpected (Hello Request or Client Hello). */
832
833 /* In case of record types for which we have 'fragment' storage,
834 * fill that so that we can process the data at a fixed place.
835 */
836 {
837 unsigned int dest_maxlen = 0;
838 unsigned char *dest = NULL;
839 unsigned int *dest_len = NULL;
840
841 if (rr->type == SSL3_RT_HANDSHAKE)
842 {
843 dest_maxlen = sizeof s->s3->handshake_fragment;
844 dest = s->s3->handshake_fragment;
845 dest_len = &s->s3->handshake_fragment_len;
846 }
847 else if (rr->type == SSL3_RT_ALERT)
848 {
849 dest_maxlen = sizeof s->s3->alert_fragment;
850 dest = s->s3->alert_fragment;
851 dest_len = &s->s3->alert_fragment_len;
852 }
853
854 if (dest_maxlen > 0)
855 {
856 n = dest_maxlen - *dest_len; /* available space in 'dest' */
857 if (rr->length < n)
858 n = rr->length; /* available bytes */
859
860 /* now move 'n' bytes: */
861 while (n-- > 0)
862 {
863 dest[(*dest_len)++] = rr->data[rr->off++];
864 rr->length--;
865 }
866
867 if (*dest_len < dest_maxlen)
868 goto start; /* fragment was too small */
869 }
870 }
871
872 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
873 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
874 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
875
876 /* If we are a client, check for an incoming 'Hello Request': */
877 if ((!s->server) &&
878 (s->s3->handshake_fragment_len >= 4) &&
879 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
880 (s->session != NULL) && (s->session->cipher != NULL))
881 {
882 s->s3->handshake_fragment_len = 0;
883
884 if ((s->s3->handshake_fragment[1] != 0) ||
885 (s->s3->handshake_fragment[2] != 0) ||
886 (s->s3->handshake_fragment[3] != 0))
887 {
888 al=SSL_AD_DECODE_ERROR;
889 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
890 goto err;
891 }
892
893 if (SSL_is_init_finished(s) &&
894 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
895 !s->s3->renegotiate)
896 {
897 ssl3_renegotiate(s);
898 if (ssl3_renegotiate_check(s))
899 {
900 i=s->handshake_func(s);
901 if (i < 0) return(i);
902 if (i == 0)
903 {
904 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
905 return(-1);
906 }
907
908 if (!(s->mode & SSL_MODE_AUTO_RETRY))
909 {
910 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
911 {
912 BIO *bio;
913 /* In the case where we try to read application data,
914 * but we trigger an SSL handshake, we return -1 with
915 * the retry option set. Otherwise renegotiation may
916 * cause nasty problems in the blocking world */
917 s->rwstate=SSL_READING;
918 bio=SSL_get_rbio(s);
919 BIO_clear_retry_flags(bio);
920 BIO_set_retry_read(bio);
921 return(-1);
922 }
923 }
924 }
925 }
926 /* we either finished a handshake or ignored the request,
927 * now try again to obtain the (application) data we were asked for */
928 goto start;
929 }
930
931 if (s->s3->alert_fragment_len >= 2)
932 {
933 int alert_level = s->s3->alert_fragment[0];
934 int alert_descr = s->s3->alert_fragment[1];
935
936 s->s3->alert_fragment_len = 0;
937
938 if (s->info_callback != NULL)
939 cb=s->info_callback;
940 else if (s->ctx->info_callback != NULL)
941 cb=s->ctx->info_callback;
942
943 if (cb != NULL)
944 {
945 j = (alert_level << 8) | alert_descr;
946 cb(s, SSL_CB_READ_ALERT, j);
947 }
948
949 if (alert_level == 1) /* warning */
950 {
951 s->s3->warn_alert = alert_descr;
952 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
953 {
954 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
955 return(0);
956 }
957 }
958 else if (alert_level == 2) /* fatal */
959 {
960 char tmp[16];
961
962 s->rwstate=SSL_NOTHING;
963 s->s3->fatal_alert = alert_descr;
964 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
965 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
966 ERR_add_error_data(2,"SSL alert number ",tmp);
967 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
968 SSL_CTX_remove_session(s->ctx,s->session);
969 return(0);
970 }
971 else
972 {
973 al=SSL_AD_ILLEGAL_PARAMETER;
974 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
975 goto f_err;
976 }
977
978 goto start;
979 }
980
981 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
982 {
983 s->rwstate=SSL_NOTHING;
984 rr->length=0;
985 return(0);
986 }
987
988 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
989 {
990 /* 'Change Cipher Spec' is just a single byte, so we know
991 * exactly what the record payload has to look like */
992 if ( (rr->length != 1) || (rr->off != 0) ||
993 (rr->data[0] != SSL3_MT_CCS))
994 {
995 i=SSL_AD_ILLEGAL_PARAMETER;
996 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
997 goto err;
998 }
999
1000 rr->length=0;
1001 s->s3->change_cipher_spec=1;
1002 if (!do_change_cipher_spec(s))
1003 goto err;
1004 else
1005 goto start;
1006 }
1007
1008 /* Unexpected handshake message (Client Hello, or protocol violation) */
1009 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1010 {
1011 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1012 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1013 {
1014#if 0 /* worked only because C operator preferences are not as expected (and
1015 * because this is not really needed for clients except for detecting
1016 * protocol violations): */
1017 s->state=SSL_ST_BEFORE|(s->server)
1018 ?SSL_ST_ACCEPT
1019 :SSL_ST_CONNECT;
1020#else
1021 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1022#endif
1023 s->new_session=1;
1024 }
1025 i=s->handshake_func(s);
1026 if (i < 0) return(i);
1027 if (i == 0)
1028 {
1029 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1030 return(-1);
1031 }
1032
1033 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1034 {
1035 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1036 {
1037 BIO *bio;
1038 /* In the case where we try to read application data,
1039 * but we trigger an SSL handshake, we return -1 with
1040 * the retry option set. Otherwise renegotiation may
1041 * cause nasty problems in the blocking world */
1042 s->rwstate=SSL_READING;
1043 bio=SSL_get_rbio(s);
1044 BIO_clear_retry_flags(bio);
1045 BIO_set_retry_read(bio);
1046 return(-1);
1047 }
1048 }
1049 goto start;
1050 }
1051
1052 switch (rr->type)
1053 {
1054 default:
1055#ifndef NO_TLS
1056 /* TLS just ignores unknown message types */
1057 if (s->version == TLS1_VERSION)
1058 {
1059 goto start;
1060 }
1061#endif
1062 al=SSL_AD_UNEXPECTED_MESSAGE;
1063 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1064 goto f_err;
1065 case SSL3_RT_CHANGE_CIPHER_SPEC:
1066 case SSL3_RT_ALERT:
1067 case SSL3_RT_HANDSHAKE:
1068 /* we already handled all of these, with the possible exception
1069 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1070 * should not happen when type != rr->type */
1071 al=SSL_AD_UNEXPECTED_MESSAGE;
1072 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_INTERNAL_ERROR);
1073 goto f_err;
1074 case SSL3_RT_APPLICATION_DATA:
1075 /* At this point, we were expecting handshake data,
1076 * but have application data. If the library was
1077 * running inside ssl3_read() (i.e. in_read_app_data
1078 * is set) and it makes sense to read application data
1079 * at this point (session renegotiation not yet started),
1080 * we will indulge it.
1081 */
1082 if (s->s3->in_read_app_data &&
1083 (s->s3->total_renegotiations != 0) &&
1084 ((
1085 (s->state & SSL_ST_CONNECT) &&
1086 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1087 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1088 ) || (
1089 (s->state & SSL_ST_ACCEPT) &&
1090 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1091 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1092 )
1093 ))
1094 {
1095 s->s3->in_read_app_data=0;
1096 return(-1);
1097 }
1098 else
1099 {
1100 al=SSL_AD_UNEXPECTED_MESSAGE;
1101 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1102 goto f_err;
1103 }
1104 }
1105 /* not reached */
1106
1107f_err:
1108 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1109err:
1110 return(-1);
1111 }
1112
1113static int do_change_cipher_spec(SSL *s)
1114 {
1115 int i;
1116 const char *sender;
1117 int slen;
1118
1119 if (s->state & SSL_ST_ACCEPT)
1120 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1121 else
1122 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1123
1124 if (s->s3->tmp.key_block == NULL)
1125 {
1126 s->session->cipher=s->s3->tmp.new_cipher;
1127 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1128 }
1129
1130 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1131 return(0);
1132
1133 /* we have to record the message digest at
1134 * this point so we can get it before we read
1135 * the finished message */
1136 if (s->state & SSL_ST_CONNECT)
1137 {
1138 sender=s->method->ssl3_enc->server_finished_label;
1139 slen=s->method->ssl3_enc->server_finished_label_len;
1140 }
1141 else
1142 {
1143 sender=s->method->ssl3_enc->client_finished_label;
1144 slen=s->method->ssl3_enc->client_finished_label_len;
1145 }
1146
1147 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1148 &(s->s3->finish_dgst1),
1149 &(s->s3->finish_dgst2),
1150 sender,slen,s->s3->tmp.peer_finish_md);
1151
1152 return(1);
1153 }
1154
1155void ssl3_send_alert(SSL *s, int level, int desc)
1156 {
1157 /* Map tls/ssl alert value to correct one */
1158 desc=s->method->ssl3_enc->alert_value(desc);
1159 if (desc < 0) return;
1160 /* If a fatal one, remove from cache */
1161 if ((level == 2) && (s->session != NULL))
1162 SSL_CTX_remove_session(s->ctx,s->session);
1163
1164 s->s3->alert_dispatch=1;
1165 s->s3->send_alert[0]=level;
1166 s->s3->send_alert[1]=desc;
1167 if (s->s3->wbuf.left == 0) /* data still being written out */
1168 ssl3_dispatch_alert(s);
1169 /* else data is still being written out, we will get written
1170 * some time in the future */
1171 }
1172
1173int ssl3_dispatch_alert(SSL *s)
1174 {
1175 int i,j;
1176 void (*cb)()=NULL;
1177
1178 s->s3->alert_dispatch=0;
1179 i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1180 if (i <= 0)
1181 {
1182 s->s3->alert_dispatch=1;
1183 }
1184 else
1185 {
1186 /* If it is important, send it now. If the message
1187 * does not get sent due to non-blocking IO, we will
1188 * not worry too much. */
1189 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1190 (void)BIO_flush(s->wbio);
1191
1192 if (s->info_callback != NULL)
1193 cb=s->info_callback;
1194 else if (s->ctx->info_callback != NULL)
1195 cb=s->ctx->info_callback;
1196
1197 if (cb != NULL)
1198 {
1199 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1200 cb(s,SSL_CB_WRITE_ALERT,j);
1201 }
1202 }
1203 return(i);
1204 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-19 22:01:46 +0000