2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
115 #include <openssl/evp.h>
116 #include <openssl/buffer.h>
117 #include "ssl_locl.h"
119 static int do_ssl3_write(SSL
*s
, int type
, const unsigned char *buf
,
121 static int ssl3_write_pending(SSL
*s
, int type
, const unsigned char *buf
,
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
);
128 /* used only by ssl3_get_record */
129 static int ssl3_read_n(SSL
*s
, int n
, int max
, int extend
)
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].)
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 */
150 /* if there is enough in the buffer from a previous read, take some */
151 if (s
->s3
->rbuf
.left
>= (int)n
)
155 s
->s3
->rbuf
.offset
+=n
;
159 /* else we need to read more data */
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
;
171 if (n
> max
) /* does not happen */
173 SSLerr(SSL_F_SSL3_READ_N
,SSL_R_INTERNAL_ERROR
);
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
)
185 memmove(s
->s3
->rbuf
.buf
, s
->packet
, off
+newb
);
186 s
->packet
= s
->s3
->rbuf
.buf
;
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) */
197 s
->rwstate
=SSL_READING
;
198 i
=BIO_read(s
->rbio
, &(s
->s3
->rbuf
.buf
[off
+newb
]), max
-newb
);
202 SSLerr(SSL_F_SSL3_READ_N
,SSL_R_READ_BIO_NOT_SET
);
208 s
->s3
->rbuf
.left
= newb
;
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
;
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
230 /* used only by ssl3_read_bytes */
231 static int ssl3_get_record(SSL
*s
)
233 int ssl_major
,ssl_minor
,al
;
238 unsigned char md
[EVP_MAX_MD_SIZE
];
240 unsigned int mac_size
;
246 if (s
->options
& SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
)
247 extra
=SSL3_RT_MAX_EXTRA
;
252 /* check if we have the header */
253 if ( (s
->rstate
!= SSL_ST_READ_BODY
) ||
254 (s
->packet_length
< SSL3_RT_HEADER_LENGTH
))
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
;
263 /* Pull apart the header into the SSL3_RECORD */
267 version
=(ssl_major
<<8)|ssl_minor
;
270 /* Lets check version */
277 if (version
!= s
->version
)
279 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_WRONG_VERSION_NUMBER
);
280 /* Send back error using their
281 * version number :-) */
283 al
=SSL_AD_PROTOCOL_VERSION
;
288 if ((version
>>8) != SSL3_VERSION_MAJOR
)
290 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_WRONG_VERSION_NUMBER
);
295 (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH
+extra
)
297 al
=SSL_AD_RECORD_OVERFLOW
;
298 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_PACKET_LENGTH_TOO_LONG
);
302 /* now s->rstate == SSL_ST_READ_BODY */
305 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
307 if (rr
->length
> (s
->packet_length
-SSL3_RT_HEADER_LENGTH
))
309 /* now s->packet_length == SSL3_RT_HEADER_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 */
317 s
->rstate
=SSL_ST_READ_HEADER
; /* set state for later operations */
319 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
320 * and we have that many bytes in s->packet
322 rr
->input
= &(s
->packet
[SSL3_RT_HEADER_LENGTH
]);
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 */
331 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
332 * rr->length bytes of encrypted compressed stuff. */
334 /* check is not needed I believe */
335 if (rr
->length
> (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH
+extra
)
337 al
=SSL_AD_RECORD_OVERFLOW
;
338 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_ENCRYPTED_LENGTH_TOO_LONG
);
342 /* decrypt in place in 'rr->input' */
345 if (!s
->method
->ssl3_enc
->enc(s
,0))
347 al
=SSL_AD_DECRYPT_ERROR
;
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'); }
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
))
363 mac_size
=EVP_MD_size(s
->read_hash
);
365 if (rr
->length
> SSL3_RT_MAX_COMPRESSED_LENGTH
+extra
+mac_size
)
367 al
=SSL_AD_RECORD_OVERFLOW
;
368 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_PRE_MAC_LENGTH_TOO_LONG
);
371 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
372 if (rr
->length
< mac_size
)
374 al
=SSL_AD_DECODE_ERROR
;
375 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_LENGTH_TOO_SHORT
);
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)
382 al
=SSL_AD_BAD_RECORD_MAC
;
383 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_BAD_MAC_DECODE
);
389 /* r->length is now just compressed */
390 if (s
->expand
!= NULL
)
393 (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH
+extra
)
395 al
=SSL_AD_RECORD_OVERFLOW
;
396 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_COMPRESSED_LENGTH_TOO_LONG
);
399 if (!do_uncompress(s
))
401 al
=SSL_AD_DECOMPRESSION_FAILURE
;
402 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_BAD_DECOMPRESSION
);
407 if (rr
->length
> (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH
+extra
)
409 al
=SSL_AD_RECORD_OVERFLOW
;
410 SSLerr(SSL_F_SSL3_GET_RECORD
,SSL_R_DATA_LENGTH_TOO_LONG
);
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
423 /* we have pulled in a full packet so zero things */
426 /* just read a 0 length packet */
427 if (rr
->length
== 0) goto again
;
431 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
436 static int do_uncompress(SSL
*ssl
)
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
);
453 static int do_compress(SSL
*ssl
)
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
);
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.
474 int ssl3_write_bytes(SSL
*s
, int type
, const void *buf_
, int len
)
476 const unsigned char *buf
=buf_
;
477 unsigned int tot
,n
,nw
;
480 s
->rwstate
=SSL_NOTHING
;
484 if (SSL_in_init(s
) && !s
->in_handshake
)
486 i
=s
->handshake_func(s
);
487 if (i
< 0) return(i
);
490 SSLerr(SSL_F_SSL3_WRITE_BYTES
,SSL_R_SSL_HANDSHAKE_FAILURE
);
498 if (n
> SSL3_RT_MAX_PLAIN_LENGTH
)
499 nw
=SSL3_RT_MAX_PLAIN_LENGTH
;
503 i
=do_ssl3_write(s
,type
,&(buf
[tot
]),nw
);
511 (type
== SSL3_RT_APPLICATION_DATA
&&
512 (s
->mode
& SSL_MODE_ENABLE_PARTIAL_WRITE
)))
522 static int do_ssl3_write(SSL
*s
, int type
, const unsigned char *buf
,
525 unsigned char *p
,*plen
;
526 int i
,mac_size
,clear
=0;
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
));
536 /* If we have an alert to send, lets send it */
537 if (s
->s3
->alert_dispatch
)
539 i
=ssl3_dispatch_alert(s
);
542 /* if it went, fall through and send more stuff */
545 if (len
== 0) return(len
);
551 if ( (sess
== NULL
) ||
552 (s
->enc_write_ctx
== NULL
) ||
553 (s
->write_hash
== NULL
))
559 mac_size
=EVP_MD_size(s
->write_hash
);
563 /* write the header */
567 *(p
++)=(s
->version
>>8);
568 *(p
++)=s
->version
&0xff;
570 /* record where we are to write out packet length */
574 /* lets setup the record stuff. */
577 wr
->input
=(unsigned char *)buf
;
579 /* we now 'read' from wr->input, wr->length bytes into
582 /* first we compress */
583 if (s
->compress
!= NULL
)
587 SSLerr(SSL_F_DO_SSL3_WRITE
,SSL_R_COMPRESSION_FAILURE
);
593 memcpy(wr
->data
,wr
->input
,wr
->length
);
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 */
603 s
->method
->ssl3_enc
->mac(s
,&(p
[wr
->length
]),1);
604 wr
->length
+=mac_size
;
609 /* ssl3_enc can only have an error on read */
610 s
->method
->ssl3_enc
->enc(s
,1);
612 /* record length after mac and block padding */
613 s2n(wr
->length
,plen
);
615 /* we should now have
616 * wr->data pointing to the encrypted data, which is
618 wr
->type
=type
; /* not needed but helps for debugging */
619 wr
->length
+=SSL3_RT_HEADER_LENGTH
;
621 /* Now lets setup wb */
625 s
->s3
->wpend_tot
=len
;
626 s
->s3
->wpend_buf
=buf
;
627 s
->s3
->wpend_type
=type
;
628 s
->s3
->wpend_ret
=len
;
630 /* we now just need to write the buffer */
631 return(ssl3_write_pending(s
,type
,buf
,len
));
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
,
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
))
648 SSLerr(SSL_F_SSL3_WRITE_PENDING
,SSL_R_BAD_WRITE_RETRY
);
657 s
->rwstate
=SSL_WRITING
;
659 (char *)&(s
->s3
->wbuf
.buf
[s
->s3
->wbuf
.offset
]),
660 (unsigned int)s
->s3
->wbuf
.left
);
664 SSLerr(SSL_F_SSL3_WRITE_PENDING
,SSL_R_BIO_NOT_SET
);
667 if (i
== s
->s3
->wbuf
.left
)
670 s
->rwstate
=SSL_NOTHING
;
671 return(s
->s3
->wpend_ret
);
675 s
->s3
->wbuf
.offset
+=i
;
680 /* Return up to 'len' payload bytes received in 'type' records.
681 * 'type' is one of the following:
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)
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).
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
699 * 2 bytes needed (AlertLevel, AlertDescription)
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
707 int ssl3_read_bytes(SSL
*s
, int type
, unsigned char *buf
, int len
)
714 if (s
->s3
->rbuf
.buf
== NULL
) /* Not initialized yet */
715 if (!ssl3_setup_buffers(s
))
718 if ((type
!= SSL3_RT_APPLICATION_DATA
) && (type
!= SSL3_RT_HANDSHAKE
) && type
)
720 SSLerr(SSL_F_SSL3_READ_BYTES
, SSL_R_INTERNAL_ERROR
);
724 if ((type
== SSL3_RT_HANDSHAKE
) && (s
->s3
->handshake_fragment_len
> 0))
725 /* (partially) satisfy request from storage */
727 unsigned char *src
= s
->s3
->handshake_fragment
;
728 unsigned char *dst
= buf
;
731 while ((len
> 0) && (s
->s3
->handshake_fragment_len
> 0))
734 len
--; s
->s3
->handshake_fragment_len
--;
737 /* move any remaining fragment bytes: */
738 for (i
= 0; i
< s
->s3
->handshake_fragment_len
; i
++)
739 s
->s3
->handshake_fragment
[i
] = *src
++;
743 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
745 if (!s
->in_handshake
&& SSL_in_init(s
))
747 /* type == SSL3_RT_APPLICATION_DATA */
748 i
=s
->handshake_func(s
);
749 if (i
< 0) return(i
);
752 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_SSL_HANDSHAKE_FAILURE
);
757 s
->rwstate
=SSL_NOTHING
;
759 /* s->s3->rrec.type - is the type of record
760 * s->s3->rrec.data, - data
761 * s->s3->rrec.off, - offset into 'data' for next read
762 * s->s3->rrec.length, - number of bytes. */
766 if ((rr
->length
== 0) || (s
->rstate
== SSL_ST_READ_BODY
))
768 ret
=ssl3_get_record(s
);
769 if (ret
<= 0) return(ret
);
772 /* we now have a packet which can be read and processed */
774 if (s
->s3
->change_cipher_spec
/* set when we receive ChangeCipherSpec,
775 * reset by ssl3_get_finished */
776 && (rr
->type
!= SSL3_RT_HANDSHAKE
))
778 al
=SSL_AD_UNEXPECTED_MESSAGE
;
779 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED
);
783 /* If the other end has shutdown, throw anything we read away */
784 if (s
->shutdown
& SSL_RECEIVED_SHUTDOWN
)
787 s
->rwstate
=SSL_NOTHING
;
792 if (type
== rr
->type
) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
794 /* make sure that we are not getting application data when we
795 * are doing a handshake for the first time */
796 if (SSL_in_init(s
) && (type
== SSL3_RT_APPLICATION_DATA
) &&
797 (s
->enc_read_ctx
== NULL
))
799 al
=SSL_AD_UNEXPECTED_MESSAGE
;
800 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_APP_DATA_IN_HANDSHAKE
);
804 if (len
<= 0) return(len
);
806 if ((unsigned int)len
> rr
->length
)
809 n
= (unsigned int)len
;
811 memcpy(buf
,&(rr
->data
[rr
->off
]),n
);
816 s
->rstate
=SSL_ST_READ_HEADER
;
823 /* If we get here, then type != rr->type; if we have a handshake
824 * message, then it was unexpected (Hello Request or Client Hello). */
826 /* In case of record types for which we have 'fragment' storage,
827 * fill that so that we can process the data at a fixed place.
830 unsigned int dest_maxlen
= 0;
831 unsigned char *dest
= NULL
;
832 unsigned int *dest_len
= NULL
;
834 if (rr
->type
== SSL3_RT_HANDSHAKE
)
836 dest_maxlen
= sizeof s
->s3
->handshake_fragment
;
837 dest
= s
->s3
->handshake_fragment
;
838 dest_len
= &s
->s3
->handshake_fragment_len
;
840 else if (rr
->type
== SSL3_RT_ALERT
)
842 dest_maxlen
= sizeof s
->s3
->alert_fragment
;
843 dest
= s
->s3
->alert_fragment
;
844 dest_len
= &s
->s3
->alert_fragment_len
;
849 n
= dest_maxlen
- *dest_len
; /* available space in 'dest' */
851 n
= rr
->length
; /* available bytes */
853 /* now move 'n' bytes: */
856 dest
[(*dest_len
)++] = rr
->data
[rr
->off
++];
860 if (*dest_len
< dest_maxlen
)
861 goto start
; /* fragment was too small */
865 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
866 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
867 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
869 /* If we are a client, check for an incoming 'Hello Request': */
871 (s
->s3
->handshake_fragment_len
>= 4) &&
872 (s
->s3
->handshake_fragment
[0] == SSL3_MT_HELLO_REQUEST
) &&
873 (s
->session
!= NULL
) && (s
->session
->cipher
!= NULL
))
875 s
->s3
->handshake_fragment_len
= 0;
877 if ((s
->s3
->handshake_fragment
[1] != 0) ||
878 (s
->s3
->handshake_fragment
[2] != 0) ||
879 (s
->s3
->handshake_fragment
[3] != 0))
881 al
=SSL_AD_DECODE_ERROR
;
882 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_BAD_HELLO_REQUEST
);
886 if (SSL_is_init_finished(s
) &&
887 !(s
->s3
->flags
& SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS
) &&
891 if (ssl3_renegotiate_check(s
))
893 n
=s
->handshake_func(s
);
894 if (n
< 0) return(n
);
897 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_SSL_HANDSHAKE_FAILURE
);
901 if (s
->s3
->rbuf
.left
== 0) /* no read-ahead left? */
904 /* In the case where we try to read application data
905 * the first time, but we trigger an SSL handshake, we
906 * return -1 with the retry option set. I do this
907 * otherwise renegotiation can cause nasty problems
908 * in the blocking world */ /* ? */
909 s
->rwstate
=SSL_READING
;
911 BIO_clear_retry_flags(bio
);
912 BIO_set_retry_read(bio
);
917 /* we either finished a handshake or ignored the request,
918 * now try again to obtain the (application) data we were asked for */
922 if (s
->s3
->alert_fragment_len
>= 2)
924 int alert_level
= s
->s3
->alert_fragment
[0];
925 int alert_descr
= s
->s3
->alert_fragment
[1];
927 s
->s3
->alert_fragment_len
= 0;
929 if (s
->info_callback
!= NULL
)
931 else if (s
->ctx
->info_callback
!= NULL
)
932 cb
=s
->ctx
->info_callback
;
936 j
= (alert_level
<< 8) | alert_descr
;
937 cb(s
, SSL_CB_READ_ALERT
, j
);
940 if (alert_level
== 1) /* warning */
942 s
->s3
->warn_alert
= alert_descr
;
943 if (alert_descr
== SSL_AD_CLOSE_NOTIFY
)
945 s
->shutdown
|= SSL_RECEIVED_SHUTDOWN
;
949 else if (alert_level
== 2) /* fatal */
953 s
->rwstate
=SSL_NOTHING
;
954 s
->s3
->fatal_alert
= alert_descr
;
955 SSLerr(SSL_F_SSL3_READ_BYTES
, SSL_AD_REASON_OFFSET
+ alert_descr
);
956 sprintf(tmp
,"%d",alert_descr
);
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
);
964 al
=SSL_AD_ILLEGAL_PARAMETER
;
965 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_UNKNOWN_ALERT_TYPE
);
972 if (s
->shutdown
& SSL_SENT_SHUTDOWN
) /* but we have not received a shutdown */
974 s
->rwstate
=SSL_NOTHING
;
979 if (rr
->type
== SSL3_RT_CHANGE_CIPHER_SPEC
)
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
))
986 i
=SSL_AD_ILLEGAL_PARAMETER
;
987 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_BAD_CHANGE_CIPHER_SPEC
);
992 s
->s3
->change_cipher_spec
=1;
993 if (!do_change_cipher_spec(s
))
999 /* Unexpected handshake message (Client Hello, or protocol violation) */
1000 if ((s
->s3
->handshake_fragment_len
>= 4) && !s
->in_handshake
)
1002 if (((s
->state
&SSL_ST_MASK
) == SSL_ST_OK
) &&
1003 !(s
->s3
->flags
& SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS
))
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
)
1012 s
->state
= s
->server
? SSL_ST_ACCEPT
: SSL_ST_CONNECT
;
1016 i
=s
->handshake_func(s
);
1017 if (i
< 0) return(i
);
1020 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_SSL_HANDSHAKE_FAILURE
);
1024 if (s
->s3
->rbuf
.left
== 0) /* no read-ahead left? */
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
);
1045 /* TLS just ignores unknown message types */
1046 if (s
->version
== TLS1_VERSION
)
1051 al
=SSL_AD_UNEXPECTED_MESSAGE
;
1052 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_UNEXPECTED_RECORD
);
1054 case SSL3_RT_CHANGE_CIPHER_SPEC
:
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
);
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.
1071 if (s
->s3
->in_read_app_data
&&
1072 (s
->s3
->total_renegotiations
!= 0) &&
1074 (s
->state
& SSL_ST_CONNECT
) &&
1075 (s
->state
>= SSL3_ST_CW_CLNT_HELLO_A
) &&
1076 (s
->state
<= SSL3_ST_CR_SRVR_HELLO_A
)
1078 (s
->state
& SSL_ST_ACCEPT
) &&
1079 (s
->state
<= SSL3_ST_SW_HELLO_REQ_A
) &&
1080 (s
->state
>= SSL3_ST_SR_CLNT_HELLO_A
)
1084 s
->s3
->in_read_app_data
=0;
1089 al
=SSL_AD_UNEXPECTED_MESSAGE
;
1090 SSLerr(SSL_F_SSL3_READ_BYTES
,SSL_R_UNEXPECTED_RECORD
);
1097 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
1102 static int do_change_cipher_spec(SSL
*s
)
1108 if (s
->state
& SSL_ST_ACCEPT
)
1109 i
=SSL3_CHANGE_CIPHER_SERVER_READ
;
1111 i
=SSL3_CHANGE_CIPHER_CLIENT_READ
;
1113 if (s
->s3
->tmp
.key_block
== NULL
)
1115 s
->session
->cipher
=s
->s3
->tmp
.new_cipher
;
1116 if (!s
->method
->ssl3_enc
->setup_key_block(s
)) return(0);
1119 if (!s
->method
->ssl3_enc
->change_cipher_state(s
,i
))
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
)
1127 sender
=s
->method
->ssl3_enc
->server_finished_label
;
1128 slen
=s
->method
->ssl3_enc
->server_finished_label_len
;
1132 sender
=s
->method
->ssl3_enc
->client_finished_label
;
1133 slen
=s
->method
->ssl3_enc
->client_finished_label_len
;
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
);
1144 void ssl3_send_alert(SSL
*s
, int level
, int desc
)
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
);
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 */
1162 int ssl3_dispatch_alert(SSL
*s
)
1167 s
->s3
->alert_dispatch
=0;
1168 i
=do_ssl3_write(s
,SSL3_RT_ALERT
,&s
->s3
->send_alert
[0],2);
1171 s
->s3
->alert_dispatch
=1;
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
);
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
;
1188 j
=(s
->s3
->send_alert
[0]<<8)|s
->s3
->send_alert
[1];
1189 cb(s
,SSL_CB_WRITE_ALERT
,j
);