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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#include <stdio.h>
60#include <errno.h>
61#define USE_SOCKETS
62#include "evp.h"
63#include "buffer.h"
64#include "ssl_locl.h"
65
66/* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CIPHER);
67 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_NO_CERTIFICATE);
68 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_CERTIFICATE);
69 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
70 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNKNOWN_REMOTE_ERROR_TYPE);
71 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNEXPECTED_MESSAGE);
72 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_RECORD_MAC);
73 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_DECOMPRESSION_FAILURE);
74 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE);
75 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_NO_CERTIFICATE);
76 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_BAD_CERTIFICATE);
77 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_UNSUPPORTED_CERTIFICATE);
78 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_REVOKED);
79 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_EXPIRED);
80 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_CERTIFICATE_UNKNOWN);
81 * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_SSLV3_ALERT_ILLEGAL_PARAMETER);
82 */
83
84#ifndef NOPROTO
85static int do_ssl3_write(SSL *s, int type, char *buf, unsigned int len);
86static int ssl3_write_pending(SSL *s, int type, char *buf, unsigned int len);
87static int ssl3_get_record(SSL *s);
88static int do_compress(SSL *ssl);
89static int do_uncompress(SSL *ssl);
90static int do_change_cipher_spec(SSL *ssl);
91#else
92static int do_ssl3_write();
93static int ssl3_write_pending();
94static int ssl3_get_record();
95static int do_compress();
96static int do_uncompress();
97static int do_change_cipher_spec();
98#endif
99
100static int ssl3_read_n(s,n,max,extend)
101SSL *s;
102int n;
103int max;
104int extend;
105 {
106 int i,off,newb;
107
108 /* if there is stuff still in the buffer from a previous read,
109 * and there is more than we want, take some. */
110 if (s->s3->rbuf.left >= (int)n)
111 {
112 if (extend)
113 s->packet_length+=n;
114 else
115 {
116 s->packet= &(s->s3->rbuf.buf[s->s3->rbuf.offset]);
117 s->packet_length=n;
118 }
119 s->s3->rbuf.left-=n;
120 s->s3->rbuf.offset+=n;
121 return(n);
122 }
123
124 /* else we need to read more data */
125 if (!s->read_ahead) max=n;
126 if (max > SSL3_RT_MAX_PACKET_SIZE)
127 max=SSL3_RT_MAX_PACKET_SIZE;
128
129 /* First check if there is some left or we want to extend */
130 off=0;
131 if ( (s->s3->rbuf.left != 0) ||
132 ((s->packet_length != 0) && extend))
133 {
134 newb=s->s3->rbuf.left;
135 if (extend)
136 {
137 /* Copy bytes back to the front of the buffer
138 * Take the bytes already pointed to by 'packet'
139 * and take the extra ones on the end. */
140 off=s->packet_length;
141 if (s->packet != s->s3->rbuf.buf)
142 memcpy(s->s3->rbuf.buf,s->packet,newb+off);
143 }
144 else if (s->s3->rbuf.offset != 0)
145 { /* so the data is not at the start of the buffer */
146 memcpy(s->s3->rbuf.buf,
147 &(s->s3->rbuf.buf[s->s3->rbuf.offset]),newb);
148 s->s3->rbuf.offset=0;
149 }
150
151 s->s3->rbuf.left=0;
152 }
153 else
154 newb=0;
155
156 /* So we now have 'newb' bytes at the front of
157 * s->s3->rbuf.buf and need to read some more in on the end
158 * We start reading into the buffer at 's->s3->rbuf.offset'
159 */
160 s->packet=s->s3->rbuf.buf;
161
162 while (newb < n)
163 {
164 clear_sys_error();
165 if (s->rbio != NULL)
166 {
167 s->rwstate=SSL_READING;
168 i=BIO_read(s->rbio,
169 (char *)&(s->s3->rbuf.buf[off+newb]),
170 max-newb);
171 }
172 else
173 {
174 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
175 i= -1;
176 }
177
178 if (i <= 0)
179 {
180 s->s3->rbuf.left+=newb;
181 return(i);
182 }
183 newb+=i;
184 }
185
186 /* record used data read */
187 if (newb > n)
188 {
189 s->s3->rbuf.offset=n+off;
190 s->s3->rbuf.left=newb-n;
191 }
192 else
193 {
194 s->s3->rbuf.offset=0;
195 s->s3->rbuf.left=0;
196 }
197
198 if (extend)
199 s->packet_length+=n;
200 else
201 s->packet_length+=n;
202 return(n);
203 }
204
205/* Call this to get a new input record.
206 * It will return <= 0 if more data is needed, normally due to an error
207 * or non-blocking IO.
208 * When it finishes, one packet has been decoded and can be found in
209 * ssl->s3->rrec.type - is the type of record
210 * ssl->s3->rrec.data, - data
211 * ssl->s3->rrec.length, - number of bytes
212 */
213static int ssl3_get_record(s)
214SSL *s;
215 {
216 char tmp_buf[512];
217 int ssl_major,ssl_minor,al;
218 int n,i,ret= -1;
219 SSL3_BUFFER *rb;
220 SSL3_RECORD *rr;
221 SSL_SESSION *sess;
222 unsigned char *p;
223 unsigned char md[EVP_MAX_MD_SIZE];
224 short version;
225 unsigned int mac_size;
226 int clear=0,extra;
227
228 rr= &(s->s3->rrec);
229 rb= &(s->s3->rbuf);
230 sess=s->session;
231
232 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
233 extra=SSL3_RT_MAX_EXTRA;
234 else
235 extra=0;
236
237again:
238 /* check if we have the header */
239 if ( (s->rstate != SSL_ST_READ_BODY) ||
240 (s->packet_length < SSL3_RT_HEADER_LENGTH))
241 {
242 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
243 SSL3_RT_MAX_PACKET_SIZE,0);
244 if (n <= 0) return(n); /* error or non-blocking */
245 s->rstate=SSL_ST_READ_BODY;
246
247 p=s->packet;
248
249 /* Pull apart the header into the SSL3_RECORD */
250 rr->type= *(p++);
251 ssl_major= *(p++);
252 ssl_minor= *(p++);
253 version=(ssl_major<<8)|ssl_minor;
254 n2s(p,rr->length);
255
256 /* Lets check version */
257 if (s->first_packet)
258 {
259 s->first_packet=0;
260 }
261 else
262 {
263 if (version != s->version)
264 {
265 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
266 /* Send back error using their
267 * version number :-) */
268 s->version=version;
269 al=SSL_AD_PROTOCOL_VERSION;
270 goto f_err;
271 }
272 }
273
274 if ((version>>8) != SSL3_VERSION_MAJOR)
275 {
276 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
277 goto err;
278 }
279
280 if (rr->length >
281 (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
282 {
283 al=SSL_AD_RECORD_OVERFLOW;
284 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
285 goto f_err;
286 }
287
288 s->rstate=SSL_ST_READ_BODY;
289 }
290
291 /* get and decode the data */
292 if (s->rstate == SSL_ST_READ_BODY)
293 {
294 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
295 {
296 i=rr->length;
297 /*-(s->packet_length-SSL3_RT_HEADER_LENGTH); */
298 n=ssl3_read_n(s,i,i,1);
299 if (n <= 0) return(n); /* error or non-blocking io */
300 }
301 s->rstate=SSL_ST_READ_HEADER;
302 }
303
304 /* At this point, we have the data in s->packet and there should be
305 * s->packet_length bytes, we must not 'overrun' this buffer :-)
306 * One of the following functions will copy the data from the
307 * s->packet buffer */
308
309 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
310
311 /* ok, we can now read from 's->packet' data into 'rr'
312 * rr->input points at rr->length bytes, which
313 * need to be copied into rr->data by either
314 * the decryption or by the decompression
315 * When the data is 'copied' into the rr->data buffer,
316 * rr->input will be pointed at the new buffer */
317
318 /* Set the state for the following operations */
319 s->rstate=SSL_ST_READ_HEADER;
320
321 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
322 * rr->length bytes of encrypted compressed stuff. */
323
324 /* check is not needed I belive */
325 if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
326 {
327 al=SSL_AD_RECORD_OVERFLOW;
328 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
329 goto f_err;
330 }
331
332 /* decrypt in place in 'rr->input' */
333 rr->data=rr->input;
334 memcpy(tmp_buf,rr->input,(rr->length > 512)?512:rr->length);
335
336 if (!s->method->ssl3_enc->enc(s,0))
337 {
338 al=SSL_AD_DECRYPT_ERROR;
339 goto f_err;
340 }
341#ifdef TLS_DEBUG
342printf("dec %d\n",rr->length);
343{ int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
344printf("\n");
345#endif
346 /* r->length is now the compressed data plus mac */
347 if ( (sess == NULL) ||
348 (s->enc_read_ctx == NULL) ||
349 (s->read_hash == NULL))
350 clear=1;
351
352 if (!clear)
353 {
354 mac_size=EVP_MD_size(s->read_hash);
355
356 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
357 {
358 al=SSL_AD_RECORD_OVERFLOW;
359 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
360 goto f_err;
361 }
362 /* check MAC for rr->input' */
363 if (rr->length < mac_size)
364 {
365 al=SSL_AD_DECODE_ERROR;
366 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
367 goto f_err;
368 }
369 rr->length-=mac_size;
370 i=s->method->ssl3_enc->mac(s,md,0);
371 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
372 {
373 al=SSL_AD_BAD_RECORD_MAC;
374 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
375 ret= -1;
376 goto f_err;
377 }
378 }
379
380 /* r->length is now just compressed */
381 if ((sess != NULL) && (sess->read_compression != NULL))
382 {
383 if (rr->length >
384 (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
385 {
386 al=SSL_AD_RECORD_OVERFLOW;
387 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
388 goto f_err;
389 }
390 if (!do_uncompress(s))
391 {
392 al=SSL_AD_DECOMPRESSION_FAILURE;
393 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
394 goto f_err;
395 }
396 }
397
398 if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
399 {
400 al=SSL_AD_RECORD_OVERFLOW;
401 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
402 goto f_err;
403 }
404
405 rr->off=0;
406 /* So at this point the following is true
407 * ssl->s3->rrec.type is the type of record
408 * ssl->s3->rrec.length == number of bytes in record
409 * ssl->s3->rrec.off == offset to first valid byte
410 * ssl->s3->rrec.data == where to take bytes from, increment
411 * after use :-).
412 */
413
414 /* we have pulled in a full packet so zero things */
415 s->packet_length=0;
416
417 /* just read a 0 length packet */
418 if (rr->length == 0) goto again;
419
420 return(1);
421f_err:
422 ssl3_send_alert(s,SSL3_AL_FATAL,al);
423err:
424 return(ret);
425 }
426
427static int do_uncompress(ssl)
428SSL *ssl;
429 {
430 return(1);
431 }
432
433static int do_compress(ssl)
434SSL *ssl;
435 {
436 return(1);
437 }
438
439/* Call this to write data
440 * It will return <= 0 if not all data has been sent or non-blocking IO.
441 */
442int ssl3_write_bytes(s,type,buf,len)
443SSL *s;
444int type;
445char *buf;
446int len;
447 {
448 unsigned int tot,n,nw;
449 int i;
450
451 s->rwstate=SSL_NOTHING;
452 tot=s->s3->wnum;
453 s->s3->wnum=0;
454
455 if (SSL_in_init(s) && !s->in_handshake)
456 {
457 i=s->handshake_func(s);
458 if (i < 0) return(i);
459 if (i == 0)
460 {
461 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
462 return(-1);
463 }
464 }
465
466 n=(len-tot);
467 for (;;)
468 {
469 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
470 nw=SSL3_RT_MAX_PLAIN_LENGTH;
471 else
472 nw=n;
473
474 i=do_ssl3_write(s,type,&(buf[tot]),nw);
475 if (i <= 0)
476 {
477 s->s3->wnum=tot;
478 return(i);
479 }
480
481 if (type == SSL3_RT_HANDSHAKE)
482 ssl3_finish_mac(s,(unsigned char *)&(buf[tot]),i);
483
484 if (i == (int)n) return(tot+i);
485
486 n-=i;
487 tot+=i;
488 }
489 }
490
491static int do_ssl3_write(s,type,buf,len)
492SSL *s;
493int type;
494char *buf;
495unsigned int len;
496 {
497 unsigned char *p,*plen;
498 int i,mac_size,clear=0;
499 SSL3_RECORD *wr;
500 SSL3_BUFFER *wb;
501 SSL_SESSION *sess;
502
503 /* first check is there is a SSL3_RECORD still being written
504 * out. This will happen with non blocking IO */
505 if (s->s3->wbuf.left != 0)
506 return(ssl3_write_pending(s,type,buf,len));
507
508 /* If we have an alert to send, lets send it */
509 if (s->s3->alert_dispatch)
510 {
511 i=ssl3_dispatch_alert(s);
512 if (i <= 0)
513 return(i);
514 /* if it went, fall through and send more stuff */
515 }
516
517 if (len <= 0) return(len);
518
519 wr= &(s->s3->wrec);
520 wb= &(s->s3->wbuf);
521 sess=s->session;
522
523 if ( (sess == NULL) ||
524 (s->enc_write_ctx == NULL) ||
525 (s->write_hash == NULL))
526 clear=1;
527
528 if (clear)
529 mac_size=0;
530 else
531 mac_size=EVP_MD_size(s->write_hash);
532
533 p=wb->buf;
534
535 /* write the header */
536 *(p++)=type&0xff;
537 wr->type=type;
538
539 *(p++)=(s->version>>8);
540 *(p++)=s->version&0xff;
541
542 /* record where we are to write out packet length */
543 plen=p;
544 p+=2;
545
546 /* lets setup the record stuff. */
547 wr->data=p;
548 wr->length=(int)len;
549 wr->input=(unsigned char *)buf;
550
551 /* we now 'read' from wr->input, wr->length bytes into
552 * wr->data */
553
554 /* first we compress */
555 if ((sess != NULL) && (sess->write_compression != NULL))
556 {
557 if (!do_compress(s))
558 {
559 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
560 goto err;
561 }
562 }
563 else
564 {
565 memcpy(wr->data,wr->input,wr->length);
566 wr->input=wr->data;
567 }
568
569 /* we should still have the output to wr->data and the input
570 * from wr->input. Length should be wr->length.
571 * wr->data still points in the wb->buf */
572
573 if (mac_size != 0)
574 {
575 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
576 wr->length+=mac_size;
577 wr->input=p;
578 wr->data=p;
579 }
580
581 /* ssl3_enc can only have an error on read */
582 s->method->ssl3_enc->enc(s,1);
583
584 /* record length after mac and block padding */
585 s2n(wr->length,plen);
586
587 /* we should now have
588 * wr->data pointing to the encrypted data, which is
589 * wr->length long */
590 wr->type=type; /* not needed but helps for debugging */
591 wr->length+=SSL3_RT_HEADER_LENGTH;
592
593 /* Now lets setup wb */
594 wb->left=wr->length;
595 wb->offset=0;
596
597 s->s3->wpend_tot=len;
598 s->s3->wpend_buf=buf;
599 s->s3->wpend_type=type;
600 s->s3->wpend_ret=len;
601
602 /* we now just need to write the buffer */
603 return(ssl3_write_pending(s,type,buf,len));
604err:
605 return(-1);
606 }
607
608/* if s->s3->wbuf.left != 0, we need to call this */
609static int ssl3_write_pending(s,type,buf,len)
610SSL *s;
611int type;
612char *buf;
613unsigned int len;
614 {
615 int i;
616
617/* XXXX */
618 if ((s->s3->wpend_tot > (int)len) || (s->s3->wpend_buf != buf)
619 || (s->s3->wpend_type != type))
620 {
621 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
622 return(-1);
623 }
624
625 for (;;)
626 {
627 clear_sys_error();
628 if (s->wbio != NULL)
629 {
630 s->rwstate=SSL_WRITING;
631 i=BIO_write(s->wbio,
632 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
633 (unsigned int)s->s3->wbuf.left);
634 }
635 else
636 {
637 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
638 i= -1;
639 }
640 if (i == s->s3->wbuf.left)
641 {
642 s->s3->wbuf.left=0;
643 s->rwstate=SSL_NOTHING;
644 return(s->s3->wpend_ret);
645 }
646 else if (i <= 0)
647 return(i);
648 s->s3->wbuf.offset+=i;
649 s->s3->wbuf.left-=i;
650 }
651 }
652
653int ssl3_read_bytes(s,type,buf,len)
654SSL *s;
655int type;
656char *buf;
657int len;
658 {
659 int al,i,j,n,ret;
660 SSL3_RECORD *rr;
661 void (*cb)()=NULL;
662 BIO *bio;
663
664 if (s->s3->rbuf.buf == NULL) /* Not initalised yet */
665 if (!ssl3_setup_buffers(s))
666 return(-1);
667
668 if (!s->in_handshake && SSL_in_init(s))
669 {
670 i=s->handshake_func(s);
671 if (i < 0) return(i);
672 if (i == 0)
673 {
674 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
675 return(-1);
676 }
677 }
678start:
679 s->rwstate=SSL_NOTHING;
680
681 /* s->s3->rrec.type - is the type of record
682 * s->s3->rrec.data, - data
683 * s->s3->rrec.off, - ofset into 'data' for next read
684 * s->s3->rrec.length, - number of bytes. */
685 rr= &(s->s3->rrec);
686
687 /* get new packet */
688 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
689 {
690 ret=ssl3_get_record(s);
691 if (ret <= 0) return(ret);
692 }
693
694 /* we now have a packet which can be read and processed */
695
696 if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
697 {
698 al=SSL_AD_UNEXPECTED_MESSAGE;
699 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
700 goto err;
701 }
702
703 /* If the other end has shutdown, throw anything we read away */
704 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
705 {
706 rr->length=0;
707 s->rwstate=SSL_NOTHING;
708 return(0);
709 }
710
711 /* Check for an incoming 'Client Request' message */
712 if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
713 (rr->data[0] == SSL3_MT_CLIENT_REQUEST) &&
714 (s->session != NULL) && (s->session->cipher != NULL))
715 {
716 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
717 (rr->data[3] != 0))
718 {
719 al=SSL_AD_DECODE_ERROR;
720 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CLIENT_REQUEST);
721 goto err;
722 }
723
724 if (SSL_is_init_finished(s) &&
725 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
726 !s->s3->renegotiate)
727 {
728 ssl3_renegotiate(s);
729 if (ssl3_renegotiate_check(s))
730 {
731 n=s->handshake_func(s);
732 if (n < 0) return(n);
733 if (n == 0)
734 {
735 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
736 return(-1);
737 }
738 }
739 }
740 rr->length=0;
741/* ZZZ */ goto start;
742 }
743
744 /* if it is not the type we want, or we have shutdown and want
745 * the peer shutdown */
746 if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
747 {
748 if (rr->type == SSL3_RT_ALERT)
749 {
750 if ((rr->length != 2) || (rr->off != 0))
751 {
752 al=SSL_AD_DECODE_ERROR;
753 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
754 goto f_err;
755 }
756
757 i=rr->data[0];
758 n=rr->data[1];
759
760 /* clear from buffer */
761 rr->length=0;
762
763 if (s->info_callback != NULL)
764 cb=s->info_callback;
765 else if (s->ctx->info_callback != NULL)
766 cb=s->ctx->info_callback;
767
768 if (cb != NULL)
769 {
770 j=(i<<8)|n;
771 cb(s,SSL_CB_READ_ALERT,j);
772 }
773
774 if (i == 1)
775 {
776 s->s3->warn_alert=n;
777 if (n == SSL_AD_CLOSE_NOTIFY)
778 {
779 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
780 return(0);
781 }
782 }
783 else if (i == 2)
784 {
785 char tmp[16];
786
787 s->rwstate=SSL_NOTHING;
788 s->s3->fatal_alert=n;
789 SSLerr(SSL_F_SSL3_READ_BYTES,1000+n);
790 sprintf(tmp,"%d",n);
791 ERR_add_error_data(2,"SSL alert number ",tmp);
792 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
793 SSL_CTX_remove_session(s->ctx,s->session);
794 return(0);
795 }
796 else
797 {
798 al=SSL_AD_ILLEGAL_PARAMETER;
799 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
800 goto f_err;
801 }
802
803 rr->length=0;
804 goto start;
805 }
806
807 if (s->shutdown & SSL_SENT_SHUTDOWN)
808 {
809 s->rwstate=SSL_NOTHING;
810 rr->length=0;
811 return(0);
812 }
813
814 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
815 {
816 if ( (rr->length != 1) || (rr->off != 0) ||
817 (rr->data[0] != SSL3_MT_CCS))
818 {
819 i=SSL_AD_ILLEGAL_PARAMETER;
820 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
821 goto err;
822 }
823
824 rr->length=0;
825 s->s3->change_cipher_spec=1;
826 if (!do_change_cipher_spec(s))
827 goto err;
828 else
829 goto start;
830 }
831
832 /* else we have a handshake */
833 if ((rr->type == SSL3_RT_HANDSHAKE) &&
834 !s->in_handshake)
835 {
836 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
837 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
838 {
839 s->state=SSL_ST_BEFORE;
840 s->new_session=1;
841 }
842 n=s->handshake_func(s);
843 if (n < 0) return(n);
844 if (n == 0)
845 {
846 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
847 return(-1);
848 }
849
850 /* In the case where we try to read application data
851 * the first time, but we trigger an SSL handshake, we
852 * return -1 with the retry option set. I do this
853 * otherwise renegotiation can cause nasty problems
854 * in the non-blocking world */
855
856 s->rwstate=SSL_READING;
857 bio=SSL_get_rbio(s);
858 BIO_clear_retry_flags(bio);
859 BIO_set_retry_read(bio);
860 return(-1);
861 }
862
863 switch (rr->type)
864 {
865 default:
866#ifndef NO_TLS
867 /* TLS just ignores unknown message types */
868 if (s->version == TLS1_VERSION)
869 {
870 goto start;
871 }
872#endif
873 case SSL3_RT_CHANGE_CIPHER_SPEC:
874 case SSL3_RT_ALERT:
875 case SSL3_RT_HANDSHAKE:
876 al=SSL_AD_UNEXPECTED_MESSAGE;
877 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
878 goto f_err;
879 case SSL3_RT_APPLICATION_DATA:
880 /* At this point, we were expecting something else,
881 * but have application data. What we do is set the
882 * error, and return -1. On the way out, if the
883 * library was running inside ssl3_read() and it makes
884 * sense to read application data at this point, we
885 * will indulge it. This will mostly happen during
886 * session renegotiation.
887 */
888 if (s->s3->in_read_app_data &&
889 (s->s3->total_renegotiations != 0) &&
890 ((
891 (s->state & SSL_ST_CONNECT) &&
892 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
893 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
894 ) || (
895 (s->state & SSL_ST_ACCEPT) &&
896 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
897 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
898 )
899 ))
900 {
901 s->s3->in_read_app_data=0;
902 return(-1);
903 }
904 else
905 {
906 al=SSL_AD_UNEXPECTED_MESSAGE;
907 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
908 goto f_err;
909 }
910 }
911 }
912
913 /* make sure that we are not getting application data when we
914 * are doing a handshake for the first time */
915 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
916 (s->enc_read_ctx == NULL))
917 {
918 al=SSL_AD_UNEXPECTED_MESSAGE;
919 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
920 goto f_err;
921 }
922
923 if (len <= 0) return(len);
924
925 if ((unsigned int)len > rr->length)
926 n=rr->length;
927 else
928 n=len;
929
930 memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
931 rr->length-=n;
932 rr->off+=n;
933 if (rr->length <= 0)
934 {
935 s->rstate=SSL_ST_READ_HEADER;
936 rr->off=0;
937 }
938
939 if (type == SSL3_RT_HANDSHAKE)
940 ssl3_finish_mac(s,(unsigned char *)buf,n);
941 return(n);
942f_err:
943 ssl3_send_alert(s,SSL3_AL_FATAL,al);
944err:
945 return(-1);
946 }
947
948static int do_change_cipher_spec(s)
949SSL *s;
950 {
951 int i;
952 unsigned char *sender;
953 int slen;
954
955 if (s->state & SSL_ST_ACCEPT)
956 i=SSL3_CHANGE_CIPHER_SERVER_READ;
957 else
958 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
959
960 if (s->s3->tmp.key_block == NULL)
961 {
962 s->session->cipher=s->s3->tmp.new_cipher;
963 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
964 }
965
966 if (!s->method->ssl3_enc->change_cipher_state(s,i))
967 return(0);
968
969 /* we have to record the message digest at
970 * this point so we can get it before we read
971 * the finished message */
972 if (s->state & SSL_ST_CONNECT)
973 {
974 sender=s->method->ssl3_enc->server_finished;
975 slen=s->method->ssl3_enc->server_finished_len;
976 }
977 else
978 {
979 sender=s->method->ssl3_enc->client_finished;
980 slen=s->method->ssl3_enc->client_finished_len;
981 }
982
983 s->method->ssl3_enc->final_finish_mac(s,
984 &(s->s3->finish_dgst1),
985 &(s->s3->finish_dgst2),
986 sender,slen,&(s->s3->tmp.finish_md[0]));
987
988 return(1);
989 }
990
991int ssl3_do_write(s,type)
992SSL *s;
993int type;
994 {
995 int ret;
996
997 ret=ssl3_write_bytes(s,type,(char *)
998 &(s->init_buf->data[s->init_off]),s->init_num);
999 if (ret == s->init_num)
1000 return(1);
1001 if (ret < 0) return(-1);
1002 s->init_off+=ret;
1003 s->init_num-=ret;
1004 return(0);
1005 }
1006
1007void ssl3_send_alert(s,level,desc)
1008SSL *s;
1009int level;
1010int desc;
1011 {
1012 /* Map tls/ssl alert value to correct one */
1013 desc=s->method->ssl3_enc->alert_value(desc);
1014 if (desc < 0) return;
1015 /* If a fatal one, remove from cache */
1016 if ((level == 2) && (s->session != NULL))
1017 SSL_CTX_remove_session(s->ctx,s->session);
1018
1019 s->s3->alert_dispatch=1;
1020 s->s3->send_alert[0]=level;
1021 s->s3->send_alert[1]=desc;
1022 if (s->s3->wbuf.left == 0) /* data still being written out */
1023 ssl3_dispatch_alert(s);
1024 /* else data is still being written out, we will get written
1025 * some time in the future */
1026 }
1027
1028int ssl3_dispatch_alert(s)
1029SSL *s;
1030 {
1031 int i,j;
1032 void (*cb)()=NULL;
1033
1034 s->s3->alert_dispatch=0;
1035 i=do_ssl3_write(s,SSL3_RT_ALERT,&(s->s3->send_alert[0]),2);
1036 if (i <= 0)
1037 {
1038 s->s3->alert_dispatch=1;
1039 }
1040 else
1041 {
1042 /* If it is important, send it now. If the message
1043 * does not get sent due to non-blocking IO, we will
1044 * not worry too much. */
1045 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1046 BIO_flush(s->wbio);
1047
1048 if (s->info_callback != NULL)
1049 cb=s->info_callback;
1050 else if (s->ctx->info_callback != NULL)
1051 cb=s->ctx->info_callback;
1052
1053 if (cb != NULL)
1054 {
1055 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1056 cb(s,SSL_CB_WRITE_ALERT,j);
1057 }
1058 }
1059 return(i);
1060 }
1061
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 13:48:38 +0000