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) 1998-2002 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 "ssl_locl.h"
116 #include <openssl/evp.h>
117 #include <openssl/buffer.h>
119 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
120 unsigned int len, int create_empty_fragment);
121 static int ssl3_get_record(SSL *s);
123 int ssl3_read_n(SSL *s, int n, int max, int extend)
125 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
126 * packet by another n bytes.
127 * The packet will be in the sub-array of s->s3->rbuf.buf specified
128 * by s->packet and s->packet_length.
129 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
130 * [plus s->packet_length bytes if extend == 1].)
136 /* start with empty packet ... */
137 if (s->s3->rbuf.left == 0)
138 s->s3->rbuf.offset = 0;
139 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
140 s->packet_length = 0;
141 /* ... now we can act as if 'extend' was set */
144 /* extend reads should not span multiple packets for DTLS */
145 if ( SSL_version(s) == DTLS1_VERSION &&
148 if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left)
149 n = s->s3->rbuf.left;
152 /* if there is enough in the buffer from a previous read, take some */
153 if (s->s3->rbuf.left >= (int)n)
157 s->s3->rbuf.offset+=n;
161 /* else we need to read more data */
166 /* avoid buffer overflow */
167 int max_max = s->s3->rbuf.len - s->packet_length;
171 if (n > max) /* does not happen */
173 SSLerr(SSL_F_SSL3_READ_N,ERR_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;
234 int enc_err,n,i,ret= -1;
238 unsigned char md[EVP_MAX_MD_SIZE];
240 unsigned int mac_size;
243 int decryption_failed_or_bad_record_mac = 0;
244 unsigned char *mac = NULL;
249 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
250 extra=SSL3_RT_MAX_EXTRA;
253 if (extra && !s->s3->init_extra)
255 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
256 * set after ssl3_setup_buffers() was done */
257 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
262 /* check if we have the header */
263 if ( (s->rstate != SSL_ST_READ_BODY) ||
264 (s->packet_length < SSL3_RT_HEADER_LENGTH))
266 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
267 if (n <= 0) return(n); /* error or non-blocking */
268 s->rstate=SSL_ST_READ_BODY;
272 /* Pull apart the header into the SSL3_RECORD */
276 version=(ssl_major<<8)|ssl_minor;
279 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
282 /* Lets check version */
289 if (version != s->version)
291 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
292 /* Send back error using their
293 * version number :-) */
295 al=SSL_AD_PROTOCOL_VERSION;
300 if ((version>>8) != SSL3_VERSION_MAJOR)
302 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
306 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
308 al=SSL_AD_RECORD_OVERFLOW;
309 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
313 /* now s->rstate == SSL_ST_READ_BODY */
316 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
318 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
320 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
322 n=ssl3_read_n(s,i,i,1);
323 if (n <= 0) return(n); /* error or non-blocking io */
324 /* now n == rr->length,
325 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
328 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
330 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
331 * and we have that many bytes in s->packet
333 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
335 /* ok, we can now read from 's->packet' data into 'rr'
336 * rr->input points at rr->length bytes, which
337 * need to be copied into rr->data by either
338 * the decryption or by the decompression
339 * When the data is 'copied' into the rr->data buffer,
340 * rr->input will be pointed at the new buffer */
342 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
343 * rr->length bytes of encrypted compressed stuff. */
345 /* check is not needed I believe */
346 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
348 al=SSL_AD_RECORD_OVERFLOW;
349 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
353 /* decrypt in place in 'rr->input' */
356 enc_err = s->method->ssl3_enc->enc(s,0);
360 /* SSLerr() and ssl3_send_alert() have been called */
363 /* Otherwise enc_err == -1, which indicates bad padding
364 * (rec->length has not been changed in this case).
365 * To minimize information leaked via timing, we will perform
366 * the MAC computation anyway. */
367 decryption_failed_or_bad_record_mac = 1;
371 printf("dec %d\n",rr->length);
372 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
376 /* r->length is now the compressed data plus mac */
377 if ( (sess == NULL) ||
378 (s->enc_read_ctx == NULL) ||
379 (s->read_hash == NULL))
384 mac_size=EVP_MD_size(s->read_hash);
386 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
388 #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
389 al=SSL_AD_RECORD_OVERFLOW;
390 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
393 decryption_failed_or_bad_record_mac = 1;
396 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
397 if (rr->length >= mac_size)
399 rr->length -= mac_size;
400 mac = &rr->data[rr->length];
404 /* record (minus padding) is too short to contain a MAC */
405 #if 0 /* OK only for stream ciphers */
406 al=SSL_AD_DECODE_ERROR;
407 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
410 decryption_failed_or_bad_record_mac = 1;
414 i=s->method->ssl3_enc->mac(s,md,0);
415 if (mac == NULL || memcmp(md, mac, mac_size) != 0)
417 decryption_failed_or_bad_record_mac = 1;
421 if (decryption_failed_or_bad_record_mac)
423 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
424 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
425 * failure is directly visible from the ciphertext anyway,
426 * we should not reveal which kind of error occured -- this
427 * might become visible to an attacker (e.g. via a logfile) */
428 al=SSL_AD_BAD_RECORD_MAC;
429 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
433 /* r->length is now just compressed */
434 if (s->expand != NULL)
436 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
438 al=SSL_AD_RECORD_OVERFLOW;
439 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
442 if (!ssl3_do_uncompress(s))
444 al=SSL_AD_DECOMPRESSION_FAILURE;
445 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
450 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
452 al=SSL_AD_RECORD_OVERFLOW;
453 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
458 /* So at this point the following is true
459 * ssl->s3->rrec.type is the type of record
460 * ssl->s3->rrec.length == number of bytes in record
461 * ssl->s3->rrec.off == offset to first valid byte
462 * ssl->s3->rrec.data == where to take bytes from, increment
466 /* we have pulled in a full packet so zero things */
469 /* just read a 0 length packet */
470 if (rr->length == 0) goto again;
473 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
479 ssl3_send_alert(s,SSL3_AL_FATAL,al);
484 int ssl3_do_uncompress(SSL *ssl)
486 #ifndef OPENSSL_NO_COMP
490 rr= &(ssl->s3->rrec);
491 i=COMP_expand_block(ssl->expand,rr->comp,
492 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
502 int ssl3_do_compress(SSL *ssl)
504 #ifndef OPENSSL_NO_COMP
508 wr= &(ssl->s3->wrec);
509 i=COMP_compress_block(ssl->compress,wr->data,
510 SSL3_RT_MAX_COMPRESSED_LENGTH,
511 wr->input,(int)wr->length);
522 /* Call this to write data in records of type 'type'
523 * It will return <= 0 if not all data has been sent or non-blocking IO.
525 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
527 const unsigned char *buf=buf_;
528 unsigned int tot,n,nw;
531 s->rwstate=SSL_NOTHING;
535 if (SSL_in_init(s) && !s->in_handshake)
537 i=s->handshake_func(s);
538 if (i < 0) return(i);
541 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
549 if (n > s->max_send_fragment)
550 nw=s->max_send_fragment;
554 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
562 (type == SSL3_RT_APPLICATION_DATA &&
563 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
565 /* next chunk of data should get another prepended empty fragment
566 * in ciphersuites with known-IV weakness: */
567 s->s3->empty_fragment_done = 0;
577 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
578 unsigned int len, int create_empty_fragment)
580 unsigned char *p,*plen;
581 int i,mac_size,clear=0;
587 /* first check if there is a SSL3_BUFFER still being written
588 * out. This will happen with non blocking IO */
589 if (s->s3->wbuf.left != 0)
590 return(ssl3_write_pending(s,type,buf,len));
592 /* If we have an alert to send, lets send it */
593 if (s->s3->alert_dispatch)
595 i=s->method->ssl_dispatch_alert(s);
598 /* if it went, fall through and send more stuff */
601 if (len == 0 && !create_empty_fragment)
608 if ( (sess == NULL) ||
609 (s->enc_write_ctx == NULL) ||
610 (s->write_hash == NULL))
616 mac_size=EVP_MD_size(s->write_hash);
618 /* 'create_empty_fragment' is true only when this function calls itself */
619 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
621 /* countermeasure against known-IV weakness in CBC ciphersuites
622 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
624 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
626 /* recursive function call with 'create_empty_fragment' set;
627 * this prepares and buffers the data for an empty fragment
628 * (these 'prefix_len' bytes are sent out later
629 * together with the actual payload) */
630 prefix_len = do_ssl3_write(s, type, buf, 0, 1);
635 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
637 /* insufficient space */
638 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
643 s->s3->empty_fragment_done = 1;
646 p = wb->buf + prefix_len;
648 /* write the header */
653 *(p++)=(s->version>>8);
654 *(p++)=s->version&0xff;
656 /* field where we are to write out packet length */
660 /* lets setup the record stuff. */
663 wr->input=(unsigned char *)buf;
665 /* we now 'read' from wr->input, wr->length bytes into
668 /* first we compress */
669 if (s->compress != NULL)
671 if (!ssl3_do_compress(s))
673 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
679 memcpy(wr->data,wr->input,wr->length);
683 /* we should still have the output to wr->data and the input
684 * from wr->input. Length should be wr->length.
685 * wr->data still points in the wb->buf */
689 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
690 wr->length+=mac_size;
695 /* ssl3_enc can only have an error on read */
696 s->method->ssl3_enc->enc(s,1);
698 /* record length after mac and block padding */
699 s2n(wr->length,plen);
701 /* we should now have
702 * wr->data pointing to the encrypted data, which is
704 wr->type=type; /* not needed but helps for debugging */
705 wr->length+=SSL3_RT_HEADER_LENGTH;
707 if (create_empty_fragment)
709 /* we are in a recursive call;
710 * just return the length, don't write out anything here
715 /* now let's set up wb */
716 wb->left = prefix_len + wr->length;
719 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
720 s->s3->wpend_tot=len;
721 s->s3->wpend_buf=buf;
722 s->s3->wpend_type=type;
723 s->s3->wpend_ret=len;
725 /* we now just need to write the buffer */
726 return ssl3_write_pending(s,type,buf,len);
731 /* if s->s3->wbuf.left != 0, we need to call this */
732 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
738 if ((s->s3->wpend_tot > (int)len)
739 || ((s->s3->wpend_buf != buf) &&
740 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
741 || (s->s3->wpend_type != type))
743 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
752 s->rwstate=SSL_WRITING;
754 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
755 (unsigned int)s->s3->wbuf.left);
759 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
762 if (i == s->s3->wbuf.left)
765 s->rwstate=SSL_NOTHING;
766 return(s->s3->wpend_ret);
770 s->s3->wbuf.offset+=i;
775 /* Return up to 'len' payload bytes received in 'type' records.
776 * 'type' is one of the following:
778 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
779 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
780 * - 0 (during a shutdown, no data has to be returned)
782 * If we don't have stored data to work from, read a SSL/TLS record first
783 * (possibly multiple records if we still don't have anything to return).
785 * This function must handle any surprises the peer may have for us, such as
786 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
787 * a surprise, but handled as if it were), or renegotiation requests.
788 * Also if record payloads contain fragments too small to process, we store
789 * them until there is enough for the respective protocol (the record protocol
790 * may use arbitrary fragmentation and even interleaving):
791 * Change cipher spec protocol
792 * just 1 byte needed, no need for keeping anything stored
794 * 2 bytes needed (AlertLevel, AlertDescription)
796 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
797 * to detect unexpected Client Hello and Hello Request messages
798 * here, anything else is handled by higher layers
799 * Application data protocol
800 * none of our business
802 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
807 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
809 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
810 if (!ssl3_setup_buffers(s))
813 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
814 (peek && (type != SSL3_RT_APPLICATION_DATA)))
816 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
820 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
821 /* (partially) satisfy request from storage */
823 unsigned char *src = s->s3->handshake_fragment;
824 unsigned char *dst = buf;
829 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
832 len--; s->s3->handshake_fragment_len--;
835 /* move any remaining fragment bytes: */
836 for (k = 0; k < s->s3->handshake_fragment_len; k++)
837 s->s3->handshake_fragment[k] = *src++;
841 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
843 if (!s->in_handshake && SSL_in_init(s))
845 /* type == SSL3_RT_APPLICATION_DATA */
846 i=s->handshake_func(s);
847 if (i < 0) return(i);
850 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
855 s->rwstate=SSL_NOTHING;
857 /* s->s3->rrec.type - is the type of record
858 * s->s3->rrec.data, - data
859 * s->s3->rrec.off, - offset into 'data' for next read
860 * s->s3->rrec.length, - number of bytes. */
863 /* get new packet if necessary */
864 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
866 ret=ssl3_get_record(s);
867 if (ret <= 0) return(ret);
870 /* we now have a packet which can be read and processed */
872 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
873 * reset by ssl3_get_finished */
874 && (rr->type != SSL3_RT_HANDSHAKE))
876 al=SSL_AD_UNEXPECTED_MESSAGE;
877 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
881 /* If the other end has shut down, throw anything we read away
882 * (even in 'peek' mode) */
883 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
886 s->rwstate=SSL_NOTHING;
891 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
893 /* make sure that we are not getting application data when we
894 * are doing a handshake for the first time */
895 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
896 (s->enc_read_ctx == NULL))
898 al=SSL_AD_UNEXPECTED_MESSAGE;
899 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
903 if (len <= 0) return(len);
905 if ((unsigned int)len > rr->length)
908 n = (unsigned int)len;
910 memcpy(buf,&(rr->data[rr->off]),n);
917 s->rstate=SSL_ST_READ_HEADER;
925 /* If we get here, then type != rr->type; if we have a handshake
926 * message, then it was unexpected (Hello Request or Client Hello). */
928 /* In case of record types for which we have 'fragment' storage,
929 * fill that so that we can process the data at a fixed place.
932 unsigned int dest_maxlen = 0;
933 unsigned char *dest = NULL;
934 unsigned int *dest_len = NULL;
936 if (rr->type == SSL3_RT_HANDSHAKE)
938 dest_maxlen = sizeof s->s3->handshake_fragment;
939 dest = s->s3->handshake_fragment;
940 dest_len = &s->s3->handshake_fragment_len;
942 else if (rr->type == SSL3_RT_ALERT)
944 dest_maxlen = sizeof s->s3->alert_fragment;
945 dest = s->s3->alert_fragment;
946 dest_len = &s->s3->alert_fragment_len;
951 n = dest_maxlen - *dest_len; /* available space in 'dest' */
953 n = rr->length; /* available bytes */
955 /* now move 'n' bytes: */
958 dest[(*dest_len)++] = rr->data[rr->off++];
962 if (*dest_len < dest_maxlen)
963 goto start; /* fragment was too small */
967 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
968 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
969 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
971 /* If we are a client, check for an incoming 'Hello Request': */
973 (s->s3->handshake_fragment_len >= 4) &&
974 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
975 (s->session != NULL) && (s->session->cipher != NULL))
977 s->s3->handshake_fragment_len = 0;
979 if ((s->s3->handshake_fragment[1] != 0) ||
980 (s->s3->handshake_fragment[2] != 0) ||
981 (s->s3->handshake_fragment[3] != 0))
983 al=SSL_AD_DECODE_ERROR;
984 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
989 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
991 if (SSL_is_init_finished(s) &&
992 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
996 if (ssl3_renegotiate_check(s))
998 i=s->handshake_func(s);
999 if (i < 0) return(i);
1002 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1006 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1008 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1011 /* In the case where we try to read application data,
1012 * but we trigger an SSL handshake, we return -1 with
1013 * the retry option set. Otherwise renegotiation may
1014 * cause nasty problems in the blocking world */
1015 s->rwstate=SSL_READING;
1016 bio=SSL_get_rbio(s);
1017 BIO_clear_retry_flags(bio);
1018 BIO_set_retry_read(bio);
1024 /* we either finished a handshake or ignored the request,
1025 * now try again to obtain the (application) data we were asked for */
1029 if (s->s3->alert_fragment_len >= 2)
1031 int alert_level = s->s3->alert_fragment[0];
1032 int alert_descr = s->s3->alert_fragment[1];
1034 s->s3->alert_fragment_len = 0;
1036 if (s->msg_callback)
1037 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1039 if (s->info_callback != NULL)
1040 cb=s->info_callback;
1041 else if (s->ctx->info_callback != NULL)
1042 cb=s->ctx->info_callback;
1046 j = (alert_level << 8) | alert_descr;
1047 cb(s, SSL_CB_READ_ALERT, j);
1050 if (alert_level == 1) /* warning */
1052 s->s3->warn_alert = alert_descr;
1053 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1055 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1059 else if (alert_level == 2) /* fatal */
1063 s->rwstate=SSL_NOTHING;
1064 s->s3->fatal_alert = alert_descr;
1065 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1066 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1067 ERR_add_error_data(2,"SSL alert number ",tmp);
1068 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1069 SSL_CTX_remove_session(s->ctx,s->session);
1074 al=SSL_AD_ILLEGAL_PARAMETER;
1075 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1082 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1084 s->rwstate=SSL_NOTHING;
1089 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1091 /* 'Change Cipher Spec' is just a single byte, so we know
1092 * exactly what the record payload has to look like */
1093 if ( (rr->length != 1) || (rr->off != 0) ||
1094 (rr->data[0] != SSL3_MT_CCS))
1096 al=SSL_AD_ILLEGAL_PARAMETER;
1097 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1101 /* Check we have a cipher to change to */
1102 if (s->s3->tmp.new_cipher == NULL)
1104 al=SSL_AD_UNEXPECTED_MESSAGE;
1105 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1111 if (s->msg_callback)
1112 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1114 s->s3->change_cipher_spec=1;
1115 if (!ssl3_do_change_cipher_spec(s))
1121 /* Unexpected handshake message (Client Hello, or protocol violation) */
1122 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1124 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1125 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1127 #if 0 /* worked only because C operator preferences are not as expected (and
1128 * because this is not really needed for clients except for detecting
1129 * protocol violations): */
1130 s->state=SSL_ST_BEFORE|(s->server)
1134 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1138 i=s->handshake_func(s);
1139 if (i < 0) return(i);
1142 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1146 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1148 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1151 /* In the case where we try to read application data,
1152 * but we trigger an SSL handshake, we return -1 with
1153 * the retry option set. Otherwise renegotiation may
1154 * cause nasty problems in the blocking world */
1155 s->rwstate=SSL_READING;
1156 bio=SSL_get_rbio(s);
1157 BIO_clear_retry_flags(bio);
1158 BIO_set_retry_read(bio);
1168 #ifndef OPENSSL_NO_TLS
1169 /* TLS just ignores unknown message types */
1170 if (s->version == TLS1_VERSION)
1176 al=SSL_AD_UNEXPECTED_MESSAGE;
1177 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1179 case SSL3_RT_CHANGE_CIPHER_SPEC:
1181 case SSL3_RT_HANDSHAKE:
1182 /* we already handled all of these, with the possible exception
1183 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1184 * should not happen when type != rr->type */
1185 al=SSL_AD_UNEXPECTED_MESSAGE;
1186 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1188 case SSL3_RT_APPLICATION_DATA:
1189 /* At this point, we were expecting handshake data,
1190 * but have application data. If the library was
1191 * running inside ssl3_read() (i.e. in_read_app_data
1192 * is set) and it makes sense to read application data
1193 * at this point (session renegotiation not yet started),
1194 * we will indulge it.
1196 if (s->s3->in_read_app_data &&
1197 (s->s3->total_renegotiations != 0) &&
1199 (s->state & SSL_ST_CONNECT) &&
1200 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1201 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1203 (s->state & SSL_ST_ACCEPT) &&
1204 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1205 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1209 s->s3->in_read_app_data=2;
1214 al=SSL_AD_UNEXPECTED_MESSAGE;
1215 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1222 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1227 int ssl3_do_change_cipher_spec(SSL *s)
1233 if (s->state & SSL_ST_ACCEPT)
1234 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1236 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1238 if (s->s3->tmp.key_block == NULL)
1240 s->session->cipher=s->s3->tmp.new_cipher;
1241 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1244 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1247 /* we have to record the message digest at
1248 * this point so we can get it before we read
1249 * the finished message */
1250 if (s->state & SSL_ST_CONNECT)
1252 sender=s->method->ssl3_enc->server_finished_label;
1253 slen=s->method->ssl3_enc->server_finished_label_len;
1257 sender=s->method->ssl3_enc->client_finished_label;
1258 slen=s->method->ssl3_enc->client_finished_label_len;
1261 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1262 &(s->s3->finish_dgst1),
1263 &(s->s3->finish_dgst2),
1264 sender,slen,s->s3->tmp.peer_finish_md);
1269 void ssl3_send_alert(SSL *s, int level, int desc)
1271 /* Map tls/ssl alert value to correct one */
1272 desc=s->method->ssl3_enc->alert_value(desc);
1273 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1274 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1275 if (desc < 0) return;
1276 /* If a fatal one, remove from cache */
1277 if ((level == 2) && (s->session != NULL))
1278 SSL_CTX_remove_session(s->ctx,s->session);
1280 s->s3->alert_dispatch=1;
1281 s->s3->send_alert[0]=level;
1282 s->s3->send_alert[1]=desc;
1283 if (s->s3->wbuf.left == 0) /* data still being written out? */
1284 s->method->ssl_dispatch_alert(s);
1285 /* else data is still being written out, we will get written
1286 * some time in the future */
1289 int ssl3_dispatch_alert(SSL *s)
1292 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1294 s->s3->alert_dispatch=0;
1295 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1298 s->s3->alert_dispatch=1;
1302 /* Alert sent to BIO. If it is important, flush it now.
1303 * If the message does not get sent due to non-blocking IO,
1304 * we will not worry too much. */
1305 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1306 (void)BIO_flush(s->wbio);
1308 if (s->msg_callback)
1309 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1311 if (s->info_callback != NULL)
1312 cb=s->info_callback;
1313 else if (s->ctx->info_callback != NULL)
1314 cb=s->ctx->info_callback;
1318 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1319 cb(s,SSL_CB_WRITE_ALERT,j);