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) 1998-1999 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 static int ssl3_read_n(SSL *s, int n, int max, int extend)
130 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
131 * packet by another n bytes.
132 * The packet will be in the sub-array of s->s3->rbuf.buf specified
133 * by s->packet and s->packet_length.
134 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
135 * [plus s->packet_length bytes if extend == 1].)
141 /* start with empty packet ... */
142 if (s->s3->rbuf.left == 0)
143 s->s3->rbuf.offset = 0;
144 s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
145 s->packet_length = 0;
146 /* ... now we can act as if 'extend' was set */
149 /* if there is enough in the buffer from a previous read, take some */
150 if (s->s3->rbuf.left >= (int)n)
154 s->s3->rbuf.offset+=n;
158 /* else we need to read more data */
163 /* avoid buffer overflow */
164 int max_max = SSL3_RT_MAX_PACKET_SIZE - s->packet_length;
165 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
166 max_max += SSL3_RT_MAX_EXTRA;
170 if (n > max) /* does not happen */
172 SSLerr(SSL_F_SSL3_READ_N,SSL_R_INTERNAL_ERROR);
176 off = s->packet_length;
177 newb = s->s3->rbuf.left;
178 /* Move any available bytes to front of buffer:
179 * 'off' bytes already pointed to by 'packet',
180 * 'newb' extra ones at the end */
181 if (s->packet != s->s3->rbuf.buf)
184 memmove(s->s3->rbuf.buf, s->packet, off+newb);
185 s->packet = s->s3->rbuf.buf;
190 /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
191 * to read in more until we have off+n (up to off+max if possible) */
196 s->rwstate=SSL_READING;
197 i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb);
201 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
207 s->s3->rbuf.left = newb;
213 /* done reading, now the book-keeping */
214 s->s3->rbuf.offset = off + n;
215 s->s3->rbuf.left = newb - n;
216 s->packet_length += n;
220 /* Call this to get a new input record.
221 * It will return <= 0 if more data is needed, normally due to an error
222 * or non-blocking IO.
223 * When it finishes, one packet has been decoded and can be found in
224 * ssl->s3->rrec.type - is the type of record
225 * ssl->s3->rrec.data, - data
226 * ssl->s3->rrec.length, - number of bytes
228 static int ssl3_get_record(SSL *s)
230 int ssl_major,ssl_minor,al;
236 unsigned char md[EVP_MAX_MD_SIZE];
238 unsigned int mac_size;
245 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
246 extra=SSL3_RT_MAX_EXTRA;
251 /* check if we have the header */
252 if ( (s->rstate != SSL_ST_READ_BODY) ||
253 (s->packet_length < SSL3_RT_HEADER_LENGTH))
255 n=ssl3_read_n(s,SSL3_RT_HEADER_LENGTH,
256 SSL3_RT_MAX_PACKET_SIZE,0);
257 if (n <= 0) return(n); /* error or non-blocking */
258 s->rstate=SSL_ST_READ_BODY;
262 /* Pull apart the header into the SSL3_RECORD */
266 version=(ssl_major<<8)|ssl_minor;
269 /* Lets check version */
276 if (version != s->version)
278 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
279 /* Send back error using their
280 * version number :-) */
282 al=SSL_AD_PROTOCOL_VERSION;
287 if ((version>>8) != SSL3_VERSION_MAJOR)
289 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
294 (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
296 al=SSL_AD_RECORD_OVERFLOW;
297 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
301 /* now s->rstate == SSL_ST_READ_BODY; */
304 /* get and decode the data */
305 if (s->rstate == SSL_ST_READ_BODY)
307 if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
310 n=ssl3_read_n(s,i,i,1);
311 if (n <= 0) return(n); /* error or non-blocking io */
313 s->rstate=SSL_ST_READ_HEADER;
316 /* At this point, we have the data in s->packet and there should be
317 * s->packet_length bytes, we must not 'overrun' this buffer :-)
318 * One of the following functions will copy the data from the
319 * s->packet buffer */
321 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
323 /* ok, we can now read from 's->packet' data into 'rr'
324 * rr->input points at rr->length bytes, which
325 * need to be copied into rr->data by either
326 * the decryption or by the decompression
327 * When the data is 'copied' into the rr->data buffer,
328 * rr->input will be pointed at the new buffer */
330 /* Set the state for the following operations */
331 s->rstate=SSL_ST_READ_HEADER;
333 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
334 * rr->length bytes of encrypted compressed stuff. */
336 /* check is not needed I belive */
337 if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
339 al=SSL_AD_RECORD_OVERFLOW;
340 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
344 /* decrypt in place in 'rr->input' */
347 if (!s->method->ssl3_enc->enc(s,0))
349 al=SSL_AD_DECRYPT_ERROR;
353 printf("dec %d\n",rr->length);
354 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
357 /* r->length is now the compressed data plus mac */
358 if ( (sess == NULL) ||
359 (s->enc_read_ctx == NULL) ||
360 (s->read_hash == NULL))
365 mac_size=EVP_MD_size(s->read_hash);
367 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
369 al=SSL_AD_RECORD_OVERFLOW;
370 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
373 /* check MAC for rr->input' */
374 if (rr->length < mac_size)
376 al=SSL_AD_DECODE_ERROR;
377 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
380 rr->length-=mac_size;
381 i=s->method->ssl3_enc->mac(s,md,0);
382 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
384 al=SSL_AD_BAD_RECORD_MAC;
385 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_MAC_DECODE);
391 /* r->length is now just compressed */
392 if (s->expand != NULL)
395 (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
397 al=SSL_AD_RECORD_OVERFLOW;
398 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
401 if (!do_uncompress(s))
403 al=SSL_AD_DECOMPRESSION_FAILURE;
404 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
409 if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
411 al=SSL_AD_RECORD_OVERFLOW;
412 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
417 /* So at this point the following is true
418 * ssl->s3->rrec.type is the type of record
419 * ssl->s3->rrec.length == number of bytes in record
420 * ssl->s3->rrec.off == offset to first valid byte
421 * ssl->s3->rrec.data == where to take bytes from, increment
425 /* we have pulled in a full packet so zero things */
428 /* just read a 0 length packet */
429 if (rr->length == 0) goto again;
433 ssl3_send_alert(s,SSL3_AL_FATAL,al);
438 static int do_uncompress(SSL *ssl)
443 rr= &(ssl->s3->rrec);
444 i=COMP_expand_block(ssl->expand,rr->comp,
445 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
455 static int do_compress(SSL *ssl)
460 wr= &(ssl->s3->wrec);
461 i=COMP_compress_block(ssl->compress,wr->data,
462 SSL3_RT_MAX_COMPRESSED_LENGTH,
463 wr->input,(int)wr->length);
473 /* Call this to write data
474 * It will return <= 0 if not all data has been sent or non-blocking IO.
476 int ssl3_write_bytes(SSL *s, int type, const void *_buf, int len)
478 const unsigned char *buf=_buf;
479 unsigned int tot,n,nw;
482 s->rwstate=SSL_NOTHING;
486 if (SSL_in_init(s) && !s->in_handshake)
488 i=s->handshake_func(s);
489 if (i < 0) return(i);
492 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
500 if (n > SSL3_RT_MAX_PLAIN_LENGTH)
501 nw=SSL3_RT_MAX_PLAIN_LENGTH;
505 i=do_ssl3_write(s,type,&(buf[tot]),nw);
512 if (type == SSL3_RT_HANDSHAKE)
513 ssl3_finish_mac(s,&(buf[tot]),i);
516 (type == SSL3_RT_APPLICATION_DATA &&
517 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
527 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
530 unsigned char *p,*plen;
531 int i,mac_size,clear=0;
536 /* first check is there is a SSL3_RECORD still being written
537 * out. This will happen with non blocking IO */
538 if (s->s3->wbuf.left != 0)
539 return(ssl3_write_pending(s,type,buf,len));
541 /* If we have an alert to send, lets send it */
542 if (s->s3->alert_dispatch)
544 i=ssl3_dispatch_alert(s);
547 /* if it went, fall through and send more stuff */
550 if (len <= 0) return(len);
556 if ( (sess == NULL) ||
557 (s->enc_write_ctx == NULL) ||
558 (s->write_hash == NULL))
564 mac_size=EVP_MD_size(s->write_hash);
568 /* write the header */
572 *(p++)=(s->version>>8);
573 *(p++)=s->version&0xff;
575 /* record where we are to write out packet length */
579 /* lets setup the record stuff. */
582 wr->input=(unsigned char *)buf;
584 /* we now 'read' from wr->input, wr->length bytes into
587 /* first we compress */
588 if (s->compress != NULL)
592 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
598 memcpy(wr->data,wr->input,wr->length);
602 /* we should still have the output to wr->data and the input
603 * from wr->input. Length should be wr->length.
604 * wr->data still points in the wb->buf */
608 s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
609 wr->length+=mac_size;
614 /* ssl3_enc can only have an error on read */
615 s->method->ssl3_enc->enc(s,1);
617 /* record length after mac and block padding */
618 s2n(wr->length,plen);
620 /* we should now have
621 * wr->data pointing to the encrypted data, which is
623 wr->type=type; /* not needed but helps for debugging */
624 wr->length+=SSL3_RT_HEADER_LENGTH;
626 /* Now lets setup wb */
630 s->s3->wpend_tot=len;
631 s->s3->wpend_buf=buf;
632 s->s3->wpend_type=type;
633 s->s3->wpend_ret=len;
635 /* we now just need to write the buffer */
636 return(ssl3_write_pending(s,type,buf,len));
641 /* if s->s3->wbuf.left != 0, we need to call this */
642 static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
648 if ((s->s3->wpend_tot > (int)len)
649 || ((s->s3->wpend_buf != buf) &&
650 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
651 || (s->s3->wpend_type != type))
653 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
662 s->rwstate=SSL_WRITING;
664 (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
665 (unsigned int)s->s3->wbuf.left);
669 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
672 if (i == s->s3->wbuf.left)
675 s->rwstate=SSL_NOTHING;
676 return(s->s3->wpend_ret);
680 s->s3->wbuf.offset+=i;
685 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len)
692 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
693 if (!ssl3_setup_buffers(s))
696 if (!s->in_handshake && SSL_in_init(s))
698 i=s->handshake_func(s);
699 if (i < 0) return(i);
702 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
707 s->rwstate=SSL_NOTHING;
709 /* s->s3->rrec.type - is the type of record
710 * s->s3->rrec.data, - data
711 * s->s3->rrec.off, - offset into 'data' for next read
712 * s->s3->rrec.length, - number of bytes. */
716 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
718 ret=ssl3_get_record(s);
719 if (ret <= 0) return(ret);
722 /* we now have a packet which can be read and processed */
724 if (s->s3->change_cipher_spec && (rr->type != SSL3_RT_HANDSHAKE))
726 al=SSL_AD_UNEXPECTED_MESSAGE;
727 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
731 /* If the other end has shutdown, throw anything we read away */
732 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
735 s->rwstate=SSL_NOTHING;
739 /* Check for an incoming 'Hello Request' message from client */
740 if ((rr->type == SSL3_RT_HANDSHAKE) && (rr->length == 4) &&
741 (rr->data[0] == SSL3_MT_HELLO_REQUEST) &&
742 (s->session != NULL) && (s->session->cipher != NULL))
744 if ((rr->data[1] != 0) || (rr->data[2] != 0) ||
747 al=SSL_AD_DECODE_ERROR;
748 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
752 if (SSL_is_init_finished(s) &&
753 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
757 if (ssl3_renegotiate_check(s))
759 n=s->handshake_func(s);
760 if (n < 0) return(n);
763 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
769 /* ZZZ */ goto start;
772 /* if it is not the type we want, or we have shutdown and want
773 * the peer shutdown */
774 if ((rr->type != type) || (s->shutdown & SSL_SENT_SHUTDOWN))
776 if (rr->type == SSL3_RT_ALERT)
778 if ((rr->length != 2) || (rr->off != 0))
780 al=SSL_AD_DECODE_ERROR;
781 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_ALERT_RECORD);
788 /* clear from buffer */
791 if (s->info_callback != NULL)
793 else if (s->ctx->info_callback != NULL)
794 cb=s->ctx->info_callback;
799 cb(s,SSL_CB_READ_ALERT,j);
805 if (n == SSL_AD_CLOSE_NOTIFY)
807 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
815 s->rwstate=SSL_NOTHING;
816 s->s3->fatal_alert=n;
817 SSLerr(SSL_F_SSL3_READ_BYTES,
818 SSL_AD_REASON_OFFSET+n);
820 ERR_add_error_data(2,"SSL alert number ",tmp);
821 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
822 SSL_CTX_remove_session(s->ctx,s->session);
827 al=SSL_AD_ILLEGAL_PARAMETER;
828 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
836 if (s->shutdown & SSL_SENT_SHUTDOWN)
838 s->rwstate=SSL_NOTHING;
843 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
845 if ( (rr->length != 1) || (rr->off != 0) ||
846 (rr->data[0] != SSL3_MT_CCS))
848 i=SSL_AD_ILLEGAL_PARAMETER;
849 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
854 s->s3->change_cipher_spec=1;
855 if (!do_change_cipher_spec(s))
861 /* else we have a handshake */
862 if ((rr->type == SSL3_RT_HANDSHAKE) &&
865 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
866 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
868 s->state=SSL_ST_BEFORE|(s->server)
873 n=s->handshake_func(s);
874 if (n < 0) return(n);
877 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
881 /* In the case where we try to read application data
882 * the first time, but we trigger an SSL handshake, we
883 * return -1 with the retry option set. I do this
884 * otherwise renegotiation can cause nasty problems
885 * in the non-blocking world */
887 s->rwstate=SSL_READING;
889 BIO_clear_retry_flags(bio);
890 BIO_set_retry_read(bio);
898 /* TLS just ignores unknown message types */
899 if (s->version == TLS1_VERSION)
904 case SSL3_RT_CHANGE_CIPHER_SPEC:
906 case SSL3_RT_HANDSHAKE:
907 al=SSL_AD_UNEXPECTED_MESSAGE;
908 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
910 case SSL3_RT_APPLICATION_DATA:
911 /* At this point, we were expecting something else,
912 * but have application data. What we do is set the
913 * error, and return -1. On the way out, if the
914 * library was running inside ssl3_read() and it makes
915 * sense to read application data at this point, we
916 * will indulge it. This will mostly happen during
917 * session renegotiation.
919 if (s->s3->in_read_app_data &&
920 (s->s3->total_renegotiations != 0) &&
922 (s->state & SSL_ST_CONNECT) &&
923 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
924 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
926 (s->state & SSL_ST_ACCEPT) &&
927 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
928 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
932 s->s3->in_read_app_data=0;
937 al=SSL_AD_UNEXPECTED_MESSAGE;
938 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
944 /* make sure that we are not getting application data when we
945 * are doing a handshake for the first time */
946 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
947 (s->enc_read_ctx == NULL))
949 al=SSL_AD_UNEXPECTED_MESSAGE;
950 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
954 if (len <= 0) return(len);
956 if ((unsigned int)len > rr->length)
961 memcpy(buf,&(rr->data[rr->off]),(unsigned int)n);
966 s->rstate=SSL_ST_READ_HEADER;
970 if (type == SSL3_RT_HANDSHAKE)
971 ssl3_finish_mac(s,buf,n);
974 ssl3_send_alert(s,SSL3_AL_FATAL,al);
979 static int do_change_cipher_spec(SSL *s)
985 if (s->state & SSL_ST_ACCEPT)
986 i=SSL3_CHANGE_CIPHER_SERVER_READ;
988 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
990 if (s->s3->tmp.key_block == NULL)
992 s->session->cipher=s->s3->tmp.new_cipher;
993 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
996 if (!s->method->ssl3_enc->change_cipher_state(s,i))
999 /* we have to record the message digest at
1000 * this point so we can get it before we read
1001 * the finished message */
1002 if (s->state & SSL_ST_CONNECT)
1004 sender=s->method->ssl3_enc->server_finished_label;
1005 slen=s->method->ssl3_enc->server_finished_label_len;
1009 sender=s->method->ssl3_enc->client_finished_label;
1010 slen=s->method->ssl3_enc->client_finished_label_len;
1013 s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
1014 &(s->s3->finish_dgst1),
1015 &(s->s3->finish_dgst2),
1016 sender,slen,s->s3->tmp.peer_finish_md);
1021 int ssl3_do_write(SSL *s, int type)
1025 ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
1027 if (ret == s->init_num)
1029 if (ret < 0) return(-1);
1035 void ssl3_send_alert(SSL *s, int level, int desc)
1037 /* Map tls/ssl alert value to correct one */
1038 desc=s->method->ssl3_enc->alert_value(desc);
1039 if (desc < 0) return;
1040 /* If a fatal one, remove from cache */
1041 if ((level == 2) && (s->session != NULL))
1042 SSL_CTX_remove_session(s->ctx,s->session);
1044 s->s3->alert_dispatch=1;
1045 s->s3->send_alert[0]=level;
1046 s->s3->send_alert[1]=desc;
1047 if (s->s3->wbuf.left == 0) /* data still being written out */
1048 ssl3_dispatch_alert(s);
1049 /* else data is still being written out, we will get written
1050 * some time in the future */
1053 int ssl3_dispatch_alert(SSL *s)
1058 s->s3->alert_dispatch=0;
1059 i=do_ssl3_write(s,SSL3_RT_ALERT,&s->s3->send_alert[0],2);
1062 s->s3->alert_dispatch=1;
1066 /* If it is important, send it now. If the message
1067 * does not get sent due to non-blocking IO, we will
1068 * not worry too much. */
1069 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1070 (void)BIO_flush(s->wbio);
1072 if (s->info_callback != NULL)
1073 cb=s->info_callback;
1074 else if (s->ctx->info_callback != NULL)
1075 cb=s->ctx->info_callback;
1079 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1080 cb(s,SSL_CB_WRITE_ALERT,j);