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>
118 #include <openssl/rand.h>
120 #ifndef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
121 # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
124 #if defined(OPENSSL_SMALL_FOOTPRINT) || \
125 !( defined(AES_ASM) && ( \
126 defined(__x86_64) || defined(__x86_64__) || \
127 defined(_M_AMD64) || defined(_M_X64) || \
128 defined(__INTEL__) ) \
130 # undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
131 # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
134 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
135 unsigned int len, int create_empty_fragment);
136 static int ssl3_get_record(SSL *s);
138 int ssl3_read_n(SSL *s, int n, int max, int extend)
140 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
141 * packet by another n bytes.
142 * The packet will be in the sub-array of s->s3->rbuf.buf specified
143 * by s->packet and s->packet_length.
144 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
145 * [plus s->packet_length bytes if extend == 1].)
152 if (n <= 0) return n;
156 if (!ssl3_setup_read_buffer(s))
160 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
161 align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
162 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
167 /* start with empty packet ... */
170 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
172 /* check if next packet length is large
173 * enough to justify payload alignment... */
174 pkt = rb->buf + rb->offset;
175 if (pkt[0] == SSL3_RT_APPLICATION_DATA
176 && (pkt[3]<<8|pkt[4]) >= 128)
178 /* Note that even if packet is corrupted
179 * and its length field is insane, we can
180 * only be led to wrong decision about
181 * whether memmove will occur or not.
182 * Header values has no effect on memmove
183 * arguments and therefore no buffer
184 * overrun can be triggered. */
185 memmove (rb->buf+align,pkt,left);
189 s->packet = rb->buf + rb->offset;
190 s->packet_length = 0;
191 /* ... now we can act as if 'extend' was set */
194 /* For DTLS/UDP reads should not span multiple packets
195 * because the read operation returns the whole packet
196 * at once (as long as it fits into the buffer). */
199 if (left > 0 && n > left)
203 /* if there is enough in the buffer from a previous read, take some */
212 /* else we need to read more data */
214 len = s->packet_length;
216 /* Move any available bytes to front of buffer:
217 * 'len' bytes already pointed to by 'packet',
218 * 'left' extra ones at the end */
219 if (s->packet != pkt) /* len > 0 */
221 memmove(pkt, s->packet, len+left);
223 rb->offset = len + align;
226 if (n > (int)(rb->len - rb->offset)) /* does not happen */
228 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
233 /* ignore max parameter */
239 if (max > (int)(rb->len - rb->offset))
240 max = rb->len - rb->offset;
245 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
246 * and need to read in more until we have len+n (up to
247 * len+max if possible) */
252 s->rwstate=SSL_READING;
253 i=BIO_read(s->rbio,pkt+len+left, max-left);
257 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
264 if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
267 ssl3_release_read_buffer(s);
271 /* reads should *never* span multiple packets for DTLS because
272 * the underlying transport protocol is message oriented as opposed
273 * to byte oriented as in the TLS case. */
277 n = left; /* makes the while condition false */
281 /* done reading, now the book-keeping */
284 s->packet_length += n;
285 s->rwstate=SSL_NOTHING;
289 /* Call this to get a new input record.
290 * It will return <= 0 if more data is needed, normally due to an error
291 * or non-blocking IO.
292 * When it finishes, one packet has been decoded and can be found in
293 * ssl->s3->rrec.type - is the type of record
294 * ssl->s3->rrec.data, - data
295 * ssl->s3->rrec.length, - number of bytes
297 /* used only by ssl3_read_bytes */
298 static int ssl3_get_record(SSL *s)
300 int ssl_major,ssl_minor,al;
301 int enc_err,n,i,ret= -1;
305 unsigned char md[EVP_MAX_MD_SIZE];
307 unsigned mac_size, orig_len;
313 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
314 extra=SSL3_RT_MAX_EXTRA;
317 if (extra && !s->s3->init_extra)
319 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
320 * set after ssl3_setup_buffers() was done */
321 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
326 /* check if we have the header */
327 if ( (s->rstate != SSL_ST_READ_BODY) ||
328 (s->packet_length < SSL3_RT_HEADER_LENGTH))
330 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
331 if (n <= 0) return(n); /* error or non-blocking */
332 s->rstate=SSL_ST_READ_BODY;
336 s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
338 /* Pull apart the header into the SSL3_RECORD */
342 version=(ssl_major<<8)|ssl_minor;
345 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
348 /* Lets check version */
349 if (!s->first_packet)
351 if (version != s->version)
353 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
354 if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
355 /* Send back error using their minor version number :-) */
356 s->version = (unsigned short)version;
357 al=SSL_AD_PROTOCOL_VERSION;
362 if ((version>>8) != SSL3_VERSION_MAJOR)
364 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
368 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
370 al=SSL_AD_RECORD_OVERFLOW;
371 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
375 /* now s->rstate == SSL_ST_READ_BODY */
378 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
380 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
382 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
384 n=ssl3_read_n(s,i,i,1);
385 if (n <= 0) return(n); /* error or non-blocking io */
386 /* now n == rr->length,
387 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
390 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
392 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
393 * and we have that many bytes in s->packet
395 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
397 /* ok, we can now read from 's->packet' data into 'rr'
398 * rr->input points at rr->length bytes, which
399 * need to be copied into rr->data by either
400 * the decryption or by the decompression
401 * When the data is 'copied' into the rr->data buffer,
402 * rr->input will be pointed at the new buffer */
404 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
405 * rr->length bytes of encrypted compressed stuff. */
407 /* check is not needed I believe */
408 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
410 al=SSL_AD_RECORD_OVERFLOW;
411 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
415 /* decrypt in place in 'rr->input' */
418 enc_err = s->method->ssl3_enc->enc(s,0);
420 * 0: (in non-constant time) if the record is publically invalid.
421 * 1: if the padding is valid
422 * -1: if the padding is invalid */
425 al=SSL_AD_DECRYPTION_FAILED;
426 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
431 printf("dec %d\n",rr->length);
432 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
436 /* r->length is now the compressed data plus mac */
437 if ((sess != NULL) &&
438 (s->enc_read_ctx != NULL) &&
439 (EVP_MD_CTX_md(s->read_hash) != NULL))
441 /* s->read_hash != NULL => mac_size != -1 */
442 unsigned char *mac = NULL;
443 unsigned char mac_tmp[EVP_MAX_MD_SIZE];
444 mac_size=EVP_MD_CTX_size(s->read_hash);
445 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
447 /* kludge: *_cbc_remove_padding passes padding length in rr->type */
448 orig_len = rr->length+((unsigned int)rr->type>>8);
450 /* orig_len is the length of the record before any padding was
451 * removed. This is public information, as is the MAC in use,
452 * therefore we can safely process the record in a different
453 * amount of time if it's too short to possibly contain a MAC.
455 if (orig_len < mac_size ||
456 /* CBC records must have a padding length byte too. */
457 (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
458 orig_len < mac_size+1))
460 al=SSL_AD_DECODE_ERROR;
461 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
465 if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
467 /* We update the length so that the TLS header bytes
468 * can be constructed correctly but we need to extract
469 * the MAC in constant time from within the record,
470 * without leaking the contents of the padding bytes.
473 ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
474 rr->length -= mac_size;
478 /* In this case there's no padding, so |orig_len|
479 * equals |rec->length| and we checked that there's
480 * enough bytes for |mac_size| above. */
481 rr->length -= mac_size;
482 mac = &rr->data[rr->length];
485 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
486 if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
488 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
494 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
495 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
496 * failure is directly visible from the ciphertext anyway,
497 * we should not reveal which kind of error occured -- this
498 * might become visible to an attacker (e.g. via a logfile) */
499 al=SSL_AD_BAD_RECORD_MAC;
500 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
504 /* r->length is now just compressed */
505 if (s->expand != NULL)
507 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
509 al=SSL_AD_RECORD_OVERFLOW;
510 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
513 if (!ssl3_do_uncompress(s))
515 al=SSL_AD_DECOMPRESSION_FAILURE;
516 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
521 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
523 al=SSL_AD_RECORD_OVERFLOW;
524 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
529 /* So at this point the following is true
530 * ssl->s3->rrec.type is the type of record
531 * ssl->s3->rrec.length == number of bytes in record
532 * ssl->s3->rrec.off == offset to first valid byte
533 * ssl->s3->rrec.data == where to take bytes from, increment
537 /* we have pulled in a full packet so zero things */
540 /* just read a 0 length packet */
541 if (rr->length == 0) goto again;
544 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
550 ssl3_send_alert(s,SSL3_AL_FATAL,al);
555 int ssl3_do_uncompress(SSL *ssl)
557 #ifndef OPENSSL_NO_COMP
561 rr= &(ssl->s3->rrec);
562 i=COMP_expand_block(ssl->expand,rr->comp,
563 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
573 int ssl3_do_compress(SSL *ssl)
575 #ifndef OPENSSL_NO_COMP
579 wr= &(ssl->s3->wrec);
580 i=COMP_compress_block(ssl->compress,wr->data,
581 SSL3_RT_MAX_COMPRESSED_LENGTH,
582 wr->input,(int)wr->length);
593 /* Call this to write data in records of type 'type'
594 * It will return <= 0 if not all data has been sent or non-blocking IO.
596 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
598 const unsigned char *buf=buf_;
601 #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
602 unsigned int max_send_fragment;
604 SSL3_BUFFER *wb=&(s->s3->wbuf);
607 s->rwstate=SSL_NOTHING;
611 if (SSL_in_init(s) && !s->in_handshake)
613 i=s->handshake_func(s);
614 if (i < 0) return(i);
617 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
622 /* ensure that if we end up with a smaller value of data to write
623 * out than the the original len from a write which didn't complete
624 * for non-blocking I/O and also somehow ended up avoiding
625 * the check for this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as
626 * it must never be possible to end up with (len-tot) as a large
627 * number that will then promptly send beyond the end of the users
628 * buffer ... so we trap and report the error in a way the user
633 SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_BAD_LENGTH);
637 /* first check if there is a SSL3_BUFFER still being written
638 * out. This will happen with non blocking IO */
641 i = ssl3_write_pending(s,type,&buf[tot],s->s3->wpend_tot);
644 /* XXX should we ssl3_release_write_buffer if i<0? */
648 tot += i; /* this might be last fragment */
651 #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
653 * Depending on platform multi-block can deliver several *times*
654 * better performance. Downside is that it has to allocate
655 * jumbo buffer to accomodate up to 8 records, but the
656 * compromise is considered worthy.
658 if (type==SSL3_RT_APPLICATION_DATA &&
659 len >= 4*(max_send_fragment=s->max_send_fragment) &&
660 s->compress==NULL && s->msg_callback==NULL &&
661 SSL_USE_EXPLICIT_IV(s) &&
662 EVP_CIPHER_flags(s->enc_write_ctx->cipher)&EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
664 unsigned char aad[13];
665 EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
668 /* minimize address aliasing conflicts */
669 if ((max_send_fragment&0xffff) == 0)
670 max_send_fragment -= 512;
672 if (tot==0 || wb->buf==NULL) /* allocate jumbo buffer */
674 ssl3_release_write_buffer(s);
676 packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
677 EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
678 max_send_fragment,NULL);
680 if (len>=8*max_send_fragment) packlen *= 8;
683 wb->buf=OPENSSL_malloc(packlen);
686 else if (tot==len) /* done? */
688 OPENSSL_free(wb->buf); /* free jumbo buffer */
696 if (n < 4*max_send_fragment)
698 OPENSSL_free(wb->buf); /* free jumbo buffer */
703 if (s->s3->alert_dispatch)
705 i=s->method->ssl_dispatch_alert(s);
713 if (n >= 8*max_send_fragment)
714 nw = max_send_fragment*(mb_param.interleave=8);
716 nw = max_send_fragment*(mb_param.interleave=4);
718 memcpy(aad,s->s3->write_sequence,8);
720 aad[9]=(unsigned char)(s->version>>8);
721 aad[10]=(unsigned char)(s->version);
728 packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
729 EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
730 sizeof(mb_param),&mb_param);
732 if (packlen<=0 || packlen>wb->len) /* never happens */
734 OPENSSL_free(wb->buf); /* free jumbo buffer */
739 mb_param.out = wb->buf;
740 mb_param.inp = &buf[tot];
743 if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
744 EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
745 sizeof(mb_param),&mb_param)<=0)
748 s->s3->write_sequence[7] += mb_param.interleave;
749 if (s->s3->write_sequence[7] < mb_param.interleave)
752 while (j>=0 && (++s->s3->write_sequence[j--])==0) ;
758 s->s3->wpend_tot = nw;
759 s->s3->wpend_buf = &buf[tot];
760 s->s3->wpend_type= type;
761 s->s3->wpend_ret = nw;
763 i = ssl3_write_pending(s,type,&buf[tot],nw);
768 OPENSSL_free(wb->buf);
776 OPENSSL_free(wb->buf); /* free jumbo buffer */
786 if (tot==len) /* done? */
788 if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
790 ssl3_release_write_buffer(s);
799 if (n > s->max_send_fragment)
800 nw=s->max_send_fragment;
804 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
807 /* XXX should we ssl3_release_write_buffer if i<0? */
813 (type == SSL3_RT_APPLICATION_DATA &&
814 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
816 /* next chunk of data should get another prepended empty fragment
817 * in ciphersuites with known-IV weakness: */
818 s->s3->empty_fragment_done = 0;
820 if ((i==(int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS &&
822 ssl3_release_write_buffer(s);
832 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
833 unsigned int len, int create_empty_fragment)
835 unsigned char *p,*plen;
836 int i,mac_size,clear=0;
841 SSL3_BUFFER *wb=&(s->s3->wbuf);
845 /* first check if there is a SSL3_BUFFER still being written
846 * out. This will happen with non blocking IO */
848 return(ssl3_write_pending(s,type,buf,len));
850 /* If we have an alert to send, lets send it */
851 if (s->s3->alert_dispatch)
853 i=s->method->ssl_dispatch_alert(s);
856 /* if it went, fall through and send more stuff */
860 if (!ssl3_setup_write_buffer(s))
863 if (len == 0 && !create_empty_fragment)
869 if ( (sess == NULL) ||
870 (s->enc_write_ctx == NULL) ||
871 (EVP_MD_CTX_md(s->write_hash) == NULL))
874 clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */
882 mac_size=EVP_MD_CTX_size(s->write_hash);
887 /* 'create_empty_fragment' is true only when this function calls itself */
888 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
890 /* countermeasure against known-IV weakness in CBC ciphersuites
891 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
893 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
895 /* recursive function call with 'create_empty_fragment' set;
896 * this prepares and buffers the data for an empty fragment
897 * (these 'prefix_len' bytes are sent out later
898 * together with the actual payload) */
899 prefix_len = do_ssl3_write(s, type, buf, 0, 1);
904 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
906 /* insufficient space */
907 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
912 s->s3->empty_fragment_done = 1;
915 if (create_empty_fragment)
917 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
918 /* extra fragment would be couple of cipher blocks,
919 * which would be multiple of SSL3_ALIGN_PAYLOAD, so
920 * if we want to align the real payload, then we can
921 * just pretent we simply have two headers. */
922 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
923 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
930 p = wb->buf + wb->offset + prefix_len;
934 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
935 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
936 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
942 /* write the header */
947 *(p++)=(s->version>>8);
948 /* Some servers hang if iniatial client hello is larger than 256
949 * bytes and record version number > TLS 1.0
951 if (s->state == SSL3_ST_CW_CLNT_HELLO_B
953 && TLS1_get_version(s) > TLS1_VERSION)
956 *(p++)=s->version&0xff;
958 /* field where we are to write out packet length */
961 /* Explicit IV length, block ciphers appropriate version flag */
962 if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s))
964 int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
965 if (mode == EVP_CIPH_CBC_MODE)
967 eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
971 /* Need explicit part of IV for GCM mode */
972 else if (mode == EVP_CIPH_GCM_MODE)
973 eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
980 /* lets setup the record stuff. */
983 wr->input=(unsigned char *)buf;
985 /* we now 'read' from wr->input, wr->length bytes into
988 /* first we compress */
989 if (s->compress != NULL)
991 if (!ssl3_do_compress(s))
993 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
999 memcpy(wr->data,wr->input,wr->length);
1003 /* we should still have the output to wr->data and the input
1004 * from wr->input. Length should be wr->length.
1005 * wr->data still points in the wb->buf */
1009 if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0)
1011 wr->length+=mac_size;
1019 /* if (RAND_pseudo_bytes(p, eivlen) <= 0)
1021 wr->length += eivlen;
1024 /* ssl3_enc can only have an error on read */
1025 s->method->ssl3_enc->enc(s,1);
1027 /* record length after mac and block padding */
1028 s2n(wr->length,plen);
1030 if (s->msg_callback)
1031 s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, s->msg_callback_arg);
1033 /* we should now have
1034 * wr->data pointing to the encrypted data, which is
1035 * wr->length long */
1036 wr->type=type; /* not needed but helps for debugging */
1037 wr->length+=SSL3_RT_HEADER_LENGTH;
1039 if (create_empty_fragment)
1041 /* we are in a recursive call;
1042 * just return the length, don't write out anything here
1047 /* now let's set up wb */
1048 wb->left = prefix_len + wr->length;
1050 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
1051 s->s3->wpend_tot=len;
1052 s->s3->wpend_buf=buf;
1053 s->s3->wpend_type=type;
1054 s->s3->wpend_ret=len;
1056 /* we now just need to write the buffer */
1057 return ssl3_write_pending(s,type,buf,len);
1062 /* if s->s3->wbuf.left != 0, we need to call this */
1063 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
1067 SSL3_BUFFER *wb=&(s->s3->wbuf);
1070 if ((s->s3->wpend_tot > (int)len)
1071 || ((s->s3->wpend_buf != buf) &&
1072 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
1073 || (s->s3->wpend_type != type))
1075 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
1082 if (s->wbio != NULL)
1084 s->rwstate=SSL_WRITING;
1085 i=BIO_write(s->wbio,
1086 (char *)&(wb->buf[wb->offset]),
1087 (unsigned int)wb->left);
1091 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
1098 s->rwstate=SSL_NOTHING;
1099 return(s->s3->wpend_ret);
1102 if (s->version == DTLS1_VERSION ||
1103 s->version == DTLS1_BAD_VER) {
1104 /* For DTLS, just drop it. That's kind of the whole
1105 point in using a datagram service */
1115 /* Return up to 'len' payload bytes received in 'type' records.
1116 * 'type' is one of the following:
1118 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
1119 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
1120 * - 0 (during a shutdown, no data has to be returned)
1122 * If we don't have stored data to work from, read a SSL/TLS record first
1123 * (possibly multiple records if we still don't have anything to return).
1125 * This function must handle any surprises the peer may have for us, such as
1126 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
1127 * a surprise, but handled as if it were), or renegotiation requests.
1128 * Also if record payloads contain fragments too small to process, we store
1129 * them until there is enough for the respective protocol (the record protocol
1130 * may use arbitrary fragmentation and even interleaving):
1131 * Change cipher spec protocol
1132 * just 1 byte needed, no need for keeping anything stored
1134 * 2 bytes needed (AlertLevel, AlertDescription)
1135 * Handshake protocol
1136 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
1137 * to detect unexpected Client Hello and Hello Request messages
1138 * here, anything else is handled by higher layers
1139 * Application data protocol
1140 * none of our business
1142 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
1147 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
1149 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
1150 if (!ssl3_setup_read_buffer(s))
1153 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
1154 (peek && (type != SSL3_RT_APPLICATION_DATA)))
1156 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
1160 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
1161 /* (partially) satisfy request from storage */
1163 unsigned char *src = s->s3->handshake_fragment;
1164 unsigned char *dst = buf;
1169 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
1172 len--; s->s3->handshake_fragment_len--;
1175 /* move any remaining fragment bytes: */
1176 for (k = 0; k < s->s3->handshake_fragment_len; k++)
1177 s->s3->handshake_fragment[k] = *src++;
1181 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
1183 if (!s->in_handshake && SSL_in_init(s))
1185 /* type == SSL3_RT_APPLICATION_DATA */
1186 i=s->handshake_func(s);
1187 if (i < 0) return(i);
1190 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1195 s->rwstate=SSL_NOTHING;
1197 /* s->s3->rrec.type - is the type of record
1198 * s->s3->rrec.data, - data
1199 * s->s3->rrec.off, - offset into 'data' for next read
1200 * s->s3->rrec.length, - number of bytes. */
1201 rr = &(s->s3->rrec);
1203 /* get new packet if necessary */
1204 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
1206 ret=ssl3_get_record(s);
1207 if (ret <= 0) return(ret);
1210 /* we now have a packet which can be read and processed */
1212 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
1213 * reset by ssl3_get_finished */
1214 && (rr->type != SSL3_RT_HANDSHAKE))
1216 al=SSL_AD_UNEXPECTED_MESSAGE;
1217 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
1221 /* If the other end has shut down, throw anything we read away
1222 * (even in 'peek' mode) */
1223 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
1226 s->rwstate=SSL_NOTHING;
1231 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
1233 /* make sure that we are not getting application data when we
1234 * are doing a handshake for the first time */
1235 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
1236 (s->enc_read_ctx == NULL))
1238 al=SSL_AD_UNEXPECTED_MESSAGE;
1239 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
1243 if (len <= 0) return(len);
1245 if ((unsigned int)len > rr->length)
1248 n = (unsigned int)len;
1250 memcpy(buf,&(rr->data[rr->off]),n);
1255 if (rr->length == 0)
1257 s->rstate=SSL_ST_READ_HEADER;
1259 if (s->mode & SSL_MODE_RELEASE_BUFFERS && s->s3->rbuf.left == 0)
1260 ssl3_release_read_buffer(s);
1267 /* If we get here, then type != rr->type; if we have a handshake
1268 * message, then it was unexpected (Hello Request or Client Hello). */
1270 /* In case of record types for which we have 'fragment' storage,
1271 * fill that so that we can process the data at a fixed place.
1274 unsigned int dest_maxlen = 0;
1275 unsigned char *dest = NULL;
1276 unsigned int *dest_len = NULL;
1278 if (rr->type == SSL3_RT_HANDSHAKE)
1280 dest_maxlen = sizeof s->s3->handshake_fragment;
1281 dest = s->s3->handshake_fragment;
1282 dest_len = &s->s3->handshake_fragment_len;
1284 else if (rr->type == SSL3_RT_ALERT)
1286 dest_maxlen = sizeof s->s3->alert_fragment;
1287 dest = s->s3->alert_fragment;
1288 dest_len = &s->s3->alert_fragment_len;
1290 #ifndef OPENSSL_NO_HEARTBEATS
1291 else if (rr->type == TLS1_RT_HEARTBEAT)
1293 tls1_process_heartbeat(s);
1295 /* Exit and notify application to read again */
1297 s->rwstate=SSL_READING;
1298 BIO_clear_retry_flags(SSL_get_rbio(s));
1299 BIO_set_retry_read(SSL_get_rbio(s));
1304 if (dest_maxlen > 0)
1306 n = dest_maxlen - *dest_len; /* available space in 'dest' */
1308 n = rr->length; /* available bytes */
1310 /* now move 'n' bytes: */
1313 dest[(*dest_len)++] = rr->data[rr->off++];
1317 if (*dest_len < dest_maxlen)
1318 goto start; /* fragment was too small */
1322 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
1323 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
1324 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1326 /* If we are a client, check for an incoming 'Hello Request': */
1328 (s->s3->handshake_fragment_len >= 4) &&
1329 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1330 (s->session != NULL) && (s->session->cipher != NULL))
1332 s->s3->handshake_fragment_len = 0;
1334 if ((s->s3->handshake_fragment[1] != 0) ||
1335 (s->s3->handshake_fragment[2] != 0) ||
1336 (s->s3->handshake_fragment[3] != 0))
1338 al=SSL_AD_DECODE_ERROR;
1339 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1343 if (s->msg_callback)
1344 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1346 if (SSL_is_init_finished(s) &&
1347 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1348 !s->s3->renegotiate)
1350 ssl3_renegotiate(s);
1351 if (ssl3_renegotiate_check(s))
1353 i=s->handshake_func(s);
1354 if (i < 0) return(i);
1357 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1361 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1363 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1366 /* In the case where we try to read application data,
1367 * but we trigger an SSL handshake, we return -1 with
1368 * the retry option set. Otherwise renegotiation may
1369 * cause nasty problems in the blocking world */
1370 s->rwstate=SSL_READING;
1371 bio=SSL_get_rbio(s);
1372 BIO_clear_retry_flags(bio);
1373 BIO_set_retry_read(bio);
1379 /* we either finished a handshake or ignored the request,
1380 * now try again to obtain the (application) data we were asked for */
1383 /* If we are a server and get a client hello when renegotiation isn't
1384 * allowed send back a no renegotiation alert and carry on.
1385 * WARNING: experimental code, needs reviewing (steve)
1388 SSL_is_init_finished(s) &&
1389 !s->s3->send_connection_binding &&
1390 (s->version > SSL3_VERSION) &&
1391 (s->s3->handshake_fragment_len >= 4) &&
1392 (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
1393 (s->session != NULL) && (s->session->cipher != NULL) &&
1394 !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1397 /*s->s3->handshake_fragment_len = 0;*/
1399 ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
1402 if (s->s3->alert_fragment_len >= 2)
1404 int alert_level = s->s3->alert_fragment[0];
1405 int alert_descr = s->s3->alert_fragment[1];
1407 s->s3->alert_fragment_len = 0;
1409 if (s->msg_callback)
1410 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1412 if (s->info_callback != NULL)
1413 cb=s->info_callback;
1414 else if (s->ctx->info_callback != NULL)
1415 cb=s->ctx->info_callback;
1419 j = (alert_level << 8) | alert_descr;
1420 cb(s, SSL_CB_READ_ALERT, j);
1423 if (alert_level == 1) /* warning */
1425 s->s3->warn_alert = alert_descr;
1426 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1428 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1431 /* This is a warning but we receive it if we requested
1432 * renegotiation and the peer denied it. Terminate with
1433 * a fatal alert because if application tried to
1434 * renegotiatie it presumably had a good reason and
1435 * expects it to succeed.
1437 * In future we might have a renegotiation where we
1438 * don't care if the peer refused it where we carry on.
1440 else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
1442 al = SSL_AD_HANDSHAKE_FAILURE;
1443 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION);
1446 #ifdef SSL_AD_MISSING_SRP_USERNAME
1447 else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
1451 else if (alert_level == 2) /* fatal */
1455 s->rwstate=SSL_NOTHING;
1456 s->s3->fatal_alert = alert_descr;
1457 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1458 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1459 ERR_add_error_data(2,"SSL alert number ",tmp);
1460 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1461 SSL_CTX_remove_session(s->ctx,s->session);
1466 al=SSL_AD_ILLEGAL_PARAMETER;
1467 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1474 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1476 s->rwstate=SSL_NOTHING;
1481 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1483 /* 'Change Cipher Spec' is just a single byte, so we know
1484 * exactly what the record payload has to look like */
1485 if ( (rr->length != 1) || (rr->off != 0) ||
1486 (rr->data[0] != SSL3_MT_CCS))
1488 al=SSL_AD_ILLEGAL_PARAMETER;
1489 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1493 /* Check we have a cipher to change to */
1494 if (s->s3->tmp.new_cipher == NULL)
1496 al=SSL_AD_UNEXPECTED_MESSAGE;
1497 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1501 if (!(s->s3->flags & SSL3_FLAGS_CCS_OK))
1503 al=SSL_AD_UNEXPECTED_MESSAGE;
1504 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1508 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
1512 if (s->msg_callback)
1513 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1515 s->s3->change_cipher_spec=1;
1516 if (!ssl3_do_change_cipher_spec(s))
1522 /* Unexpected handshake message (Client Hello, or protocol violation) */
1523 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1525 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1526 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1528 #if 0 /* worked only because C operator preferences are not as expected (and
1529 * because this is not really needed for clients except for detecting
1530 * protocol violations): */
1531 s->state=SSL_ST_BEFORE|(s->server)
1535 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1540 i=s->handshake_func(s);
1541 if (i < 0) return(i);
1544 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1548 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1550 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1553 /* In the case where we try to read application data,
1554 * but we trigger an SSL handshake, we return -1 with
1555 * the retry option set. Otherwise renegotiation may
1556 * cause nasty problems in the blocking world */
1557 s->rwstate=SSL_READING;
1558 bio=SSL_get_rbio(s);
1559 BIO_clear_retry_flags(bio);
1560 BIO_set_retry_read(bio);
1570 #ifndef OPENSSL_NO_TLS
1571 /* TLS up to v1.1 just ignores unknown message types:
1572 * TLS v1.2 give an unexpected message alert.
1574 if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION)
1580 al=SSL_AD_UNEXPECTED_MESSAGE;
1581 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1583 case SSL3_RT_CHANGE_CIPHER_SPEC:
1585 case SSL3_RT_HANDSHAKE:
1586 /* we already handled all of these, with the possible exception
1587 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1588 * should not happen when type != rr->type */
1589 al=SSL_AD_UNEXPECTED_MESSAGE;
1590 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1592 case SSL3_RT_APPLICATION_DATA:
1593 /* At this point, we were expecting handshake data,
1594 * but have application data. If the library was
1595 * running inside ssl3_read() (i.e. in_read_app_data
1596 * is set) and it makes sense to read application data
1597 * at this point (session renegotiation not yet started),
1598 * we will indulge it.
1600 if (s->s3->in_read_app_data &&
1601 (s->s3->total_renegotiations != 0) &&
1603 (s->state & SSL_ST_CONNECT) &&
1604 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1605 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1607 (s->state & SSL_ST_ACCEPT) &&
1608 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1609 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1613 s->s3->in_read_app_data=2;
1618 al=SSL_AD_UNEXPECTED_MESSAGE;
1619 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1626 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1631 int ssl3_do_change_cipher_spec(SSL *s)
1637 if (s->state & SSL_ST_ACCEPT)
1638 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1640 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1642 if (s->s3->tmp.key_block == NULL)
1644 if (s->session == NULL || s->session->master_key_length == 0)
1646 /* might happen if dtls1_read_bytes() calls this */
1647 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1651 s->session->cipher=s->s3->tmp.new_cipher;
1652 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1655 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1658 /* we have to record the message digest at
1659 * this point so we can get it before we read
1660 * the finished message */
1661 if (s->state & SSL_ST_CONNECT)
1663 sender=s->method->ssl3_enc->server_finished_label;
1664 slen=s->method->ssl3_enc->server_finished_label_len;
1668 sender=s->method->ssl3_enc->client_finished_label;
1669 slen=s->method->ssl3_enc->client_finished_label_len;
1672 i = s->method->ssl3_enc->final_finish_mac(s,
1673 sender,slen,s->s3->tmp.peer_finish_md);
1676 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
1679 s->s3->tmp.peer_finish_md_len = i;
1684 int ssl3_send_alert(SSL *s, int level, int desc)
1686 /* Map tls/ssl alert value to correct one */
1687 desc=s->method->ssl3_enc->alert_value(desc);
1688 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1689 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1690 if (desc < 0) return -1;
1691 /* If a fatal one, remove from cache */
1692 if ((level == 2) && (s->session != NULL))
1693 SSL_CTX_remove_session(s->ctx,s->session);
1695 s->s3->alert_dispatch=1;
1696 s->s3->send_alert[0]=level;
1697 s->s3->send_alert[1]=desc;
1698 if (s->s3->wbuf.left == 0) /* data still being written out? */
1699 return s->method->ssl_dispatch_alert(s);
1700 /* else data is still being written out, we will get written
1701 * some time in the future */
1705 int ssl3_dispatch_alert(SSL *s)
1708 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1710 s->s3->alert_dispatch=0;
1711 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1714 s->s3->alert_dispatch=1;
1718 /* Alert sent to BIO. If it is important, flush it now.
1719 * If the message does not get sent due to non-blocking IO,
1720 * we will not worry too much. */
1721 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1722 (void)BIO_flush(s->wbio);
1724 if (s->msg_callback)
1725 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1727 if (s->info_callback != NULL)
1728 cb=s->info_callback;
1729 else if (s->ctx->info_callback != NULL)
1730 cb=s->ctx->info_callback;
1734 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1735 cb(s,SSL_CB_WRITE_ALERT,j);