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).
116 #include "ssl_locl.h"
117 #include <openssl/evp.h>
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
121 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
122 unsigned int len, int create_empty_fragment);
123 static int ssl3_get_record(SSL *s);
125 int ssl3_read_n(SSL *s, int n, int max, int extend)
127 /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
128 * packet by another n bytes.
129 * The packet will be in the sub-array of s->s3->rbuf.buf specified
130 * by s->packet and s->packet_length.
131 * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
132 * [plus s->packet_length bytes if extend == 1].)
139 if (n <= 0) return n;
143 if (!ssl3_setup_read_buffer(s))
147 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
148 align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
149 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
154 /* start with empty packet ... */
157 else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
159 /* check if next packet length is large
160 * enough to justify payload alignment... */
161 pkt = rb->buf + rb->offset;
162 if (pkt[0] == SSL3_RT_APPLICATION_DATA
163 && (pkt[3]<<8|pkt[4]) >= 128)
165 /* Note that even if packet is corrupted
166 * and its length field is insane, we can
167 * only be led to wrong decision about
168 * whether memmove will occur or not.
169 * Header values has no effect on memmove
170 * arguments and therefore no buffer
171 * overrun can be triggered. */
172 memmove (rb->buf+align,pkt,left);
176 s->packet = rb->buf + rb->offset;
177 s->packet_length = 0;
178 /* ... now we can act as if 'extend' was set */
181 /* For DTLS/UDP reads should not span multiple packets
182 * because the read operation returns the whole packet
183 * at once (as long as it fits into the buffer). */
184 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
186 if (left == 0 && extend)
188 if (left > 0 && n > left)
192 /* if there is enough in the buffer from a previous read, take some */
201 /* else we need to read more data */
203 len = s->packet_length;
205 /* Move any available bytes to front of buffer:
206 * 'len' bytes already pointed to by 'packet',
207 * 'left' extra ones at the end */
208 if (s->packet != pkt) /* len > 0 */
210 memmove(pkt, s->packet, len+left);
212 rb->offset = len + align;
215 if (n > (int)(rb->len - rb->offset)) /* does not happen */
217 SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
222 /* ignore max parameter */
228 if (max > (int)(rb->len - rb->offset))
229 max = rb->len - rb->offset;
234 /* Now we have len+left bytes at the front of s->s3->rbuf.buf
235 * and need to read in more until we have len+n (up to
236 * len+max if possible) */
241 s->rwstate=SSL_READING;
242 i=BIO_read(s->rbio,pkt+len+left, max-left);
246 SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
253 if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
254 SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
256 ssl3_release_read_buffer(s);
260 /* reads should *never* span multiple packets for DTLS because
261 * the underlying transport protocol is message oriented as opposed
262 * to byte oriented as in the TLS case. */
263 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
266 n = left; /* makes the while condition false */
270 /* done reading, now the book-keeping */
273 s->packet_length += n;
274 s->rwstate=SSL_NOTHING;
278 /* MAX_EMPTY_RECORDS defines the number of consecutive, empty records that will
279 * be processed per call to ssl3_get_record. Without this limit an attacker
280 * could send empty records at a faster rate than we can process and cause
281 * ssl3_get_record to loop forever. */
282 #define MAX_EMPTY_RECORDS 32
284 /* Call this to get a new input record.
285 * It will return <= 0 if more data is needed, normally due to an error
286 * or non-blocking IO.
287 * When it finishes, one packet has been decoded and can be found in
288 * ssl->s3->rrec.type - is the type of record
289 * ssl->s3->rrec.data, - data
290 * ssl->s3->rrec.length, - number of bytes
292 /* used only by ssl3_read_bytes */
293 static int ssl3_get_record(SSL *s)
295 int ssl_major,ssl_minor,al;
296 int enc_err,n,i,ret= -1;
300 unsigned char md[EVP_MAX_MD_SIZE];
302 unsigned mac_size, orig_len;
304 unsigned empty_record_count = 0;
309 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
310 extra=SSL3_RT_MAX_EXTRA;
313 if (extra && !s->s3->init_extra)
315 /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
316 * set after ssl3_setup_buffers() was done */
317 SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
322 /* check if we have the header */
323 if ( (s->rstate != SSL_ST_READ_BODY) ||
324 (s->packet_length < SSL3_RT_HEADER_LENGTH))
326 n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
327 if (n <= 0) return(n); /* error or non-blocking */
328 s->rstate=SSL_ST_READ_BODY;
332 /* Pull apart the header into the SSL3_RECORD */
336 version=(ssl_major<<8)|ssl_minor;
339 fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
342 /* Lets check version */
343 if (!s->first_packet)
345 if (version != s->version)
347 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
348 if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
349 /* Send back error using their minor version number :-) */
350 s->version = (unsigned short)version;
351 al=SSL_AD_PROTOCOL_VERSION;
356 if ((version>>8) != SSL3_VERSION_MAJOR)
358 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
362 if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
364 al=SSL_AD_RECORD_OVERFLOW;
365 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
369 /* now s->rstate == SSL_ST_READ_BODY */
372 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
374 if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
376 /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
378 n=ssl3_read_n(s,i,i,1);
379 if (n <= 0) return(n); /* error or non-blocking io */
380 /* now n == rr->length,
381 * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
384 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
386 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
387 * and we have that many bytes in s->packet
389 rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
391 /* ok, we can now read from 's->packet' data into 'rr'
392 * rr->input points at rr->length bytes, which
393 * need to be copied into rr->data by either
394 * the decryption or by the decompression
395 * When the data is 'copied' into the rr->data buffer,
396 * rr->input will be pointed at the new buffer */
398 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
399 * rr->length bytes of encrypted compressed stuff. */
401 /* check is not needed I believe */
402 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
404 al=SSL_AD_RECORD_OVERFLOW;
405 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
409 /* decrypt in place in 'rr->input' */
412 enc_err = s->method->ssl3_enc->enc(s,0);
414 * 0: (in non-constant time) if the record is publically invalid.
415 * 1: if the padding is valid
416 * -1: if the padding is invalid */
419 al=SSL_AD_DECRYPTION_FAILED;
420 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
425 printf("dec %d\n",rr->length);
426 { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
430 /* r->length is now the compressed data plus mac */
431 if ((sess != NULL) &&
432 (s->enc_read_ctx != NULL) &&
433 (EVP_MD_CTX_md(s->read_hash) != NULL))
435 /* s->read_hash != NULL => mac_size != -1 */
436 unsigned char *mac = NULL;
437 unsigned char mac_tmp[EVP_MAX_MD_SIZE];
438 mac_size=EVP_MD_CTX_size(s->read_hash);
439 OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
441 /* kludge: *_cbc_remove_padding passes padding length in rr->type */
442 orig_len = rr->length+((unsigned int)rr->type>>8);
444 /* orig_len is the length of the record before any padding was
445 * removed. This is public information, as is the MAC in use,
446 * therefore we can safely process the record in a different
447 * amount of time if it's too short to possibly contain a MAC.
449 if (orig_len < mac_size ||
450 /* CBC records must have a padding length byte too. */
451 (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
452 orig_len < mac_size+1))
454 al=SSL_AD_DECODE_ERROR;
455 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
459 if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
461 /* We update the length so that the TLS header bytes
462 * can be constructed correctly but we need to extract
463 * the MAC in constant time from within the record,
464 * without leaking the contents of the padding bytes.
467 ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
468 rr->length -= mac_size;
472 /* In this case there's no padding, so |orig_len|
473 * equals |rec->length| and we checked that there's
474 * enough bytes for |mac_size| above. */
475 rr->length -= mac_size;
476 mac = &rr->data[rr->length];
479 i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
480 if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
482 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
488 /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
489 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
490 * failure is directly visible from the ciphertext anyway,
491 * we should not reveal which kind of error occured -- this
492 * might become visible to an attacker (e.g. via a logfile) */
493 al=SSL_AD_BAD_RECORD_MAC;
494 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
498 /* r->length is now just compressed */
499 if (s->expand != NULL)
501 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
503 al=SSL_AD_RECORD_OVERFLOW;
504 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
507 if (!ssl3_do_uncompress(s))
509 al=SSL_AD_DECOMPRESSION_FAILURE;
510 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
515 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
517 al=SSL_AD_RECORD_OVERFLOW;
518 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
523 /* So at this point the following is true
524 * ssl->s3->rrec.type is the type of record
525 * ssl->s3->rrec.length == number of bytes in record
526 * ssl->s3->rrec.off == offset to first valid byte
527 * ssl->s3->rrec.data == where to take bytes from, increment
531 /* we have pulled in a full packet so zero things */
534 /* just read a 0 length packet */
537 empty_record_count++;
538 if (empty_record_count > MAX_EMPTY_RECORDS)
540 al=SSL_AD_UNEXPECTED_MESSAGE;
541 SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_RECORD_TOO_SMALL);
548 fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
554 ssl3_send_alert(s,SSL3_AL_FATAL,al);
559 int ssl3_do_uncompress(SSL *ssl)
561 #ifndef OPENSSL_NO_COMP
565 rr= &(ssl->s3->rrec);
566 i=COMP_expand_block(ssl->expand,rr->comp,
567 SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
577 int ssl3_do_compress(SSL *ssl)
579 #ifndef OPENSSL_NO_COMP
583 wr= &(ssl->s3->wrec);
584 i=COMP_compress_block(ssl->compress,wr->data,
585 SSL3_RT_MAX_COMPRESSED_LENGTH,
586 wr->input,(int)wr->length);
597 /* Call this to write data in records of type 'type'
598 * It will return <= 0 if not all data has been sent or non-blocking IO.
600 int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
602 const unsigned char *buf=buf_;
606 s->rwstate=SSL_NOTHING;
607 OPENSSL_assert(s->s3->wnum <= INT_MAX);
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);
641 if (n > s->max_send_fragment)
642 nw=s->max_send_fragment;
646 i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
654 (type == SSL3_RT_APPLICATION_DATA &&
655 (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
657 /* next chunk of data should get another prepended empty fragment
658 * in ciphersuites with known-IV weakness: */
659 s->s3->empty_fragment_done = 0;
669 static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
670 unsigned int len, int create_empty_fragment)
672 unsigned char *p,*plen;
673 int i,mac_size,clear=0;
678 SSL3_BUFFER *wb=&(s->s3->wbuf);
682 /* first check if there is a SSL3_BUFFER still being written
683 * out. This will happen with non blocking IO */
685 return(ssl3_write_pending(s,type,buf,len));
687 /* If we have an alert to send, lets send it */
688 if (s->s3->alert_dispatch)
690 i=s->method->ssl_dispatch_alert(s);
693 /* if it went, fall through and send more stuff */
697 if (!ssl3_setup_write_buffer(s))
700 if (len == 0 && !create_empty_fragment)
706 if ( (sess == NULL) ||
707 (s->enc_write_ctx == NULL) ||
708 (EVP_MD_CTX_md(s->write_hash) == NULL))
711 clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */
719 mac_size=EVP_MD_CTX_size(s->write_hash);
724 /* 'create_empty_fragment' is true only when this function calls itself */
725 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
727 /* countermeasure against known-IV weakness in CBC ciphersuites
728 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
730 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
732 /* recursive function call with 'create_empty_fragment' set;
733 * this prepares and buffers the data for an empty fragment
734 * (these 'prefix_len' bytes are sent out later
735 * together with the actual payload) */
736 prefix_len = do_ssl3_write(s, type, buf, 0, 1);
741 (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
743 /* insufficient space */
744 SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
749 s->s3->empty_fragment_done = 1;
752 if (create_empty_fragment)
754 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
755 /* extra fragment would be couple of cipher blocks,
756 * which would be multiple of SSL3_ALIGN_PAYLOAD, so
757 * if we want to align the real payload, then we can
758 * just pretent we simply have two headers. */
759 align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
760 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
767 p = wb->buf + wb->offset + prefix_len;
771 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
772 align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
773 align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
779 /* write the header */
784 *(p++)=(s->version>>8);
785 /* Some servers hang if iniatial client hello is larger than 256
786 * bytes and record version number > TLS 1.0
788 if (s->state == SSL3_ST_CW_CLNT_HELLO_B
790 && TLS1_get_version(s) > TLS1_VERSION)
793 *(p++)=s->version&0xff;
795 /* field where we are to write out packet length */
798 /* Explicit IV length, block ciphers and TLS version 1.1 or later */
799 if (s->enc_write_ctx && s->version >= TLS1_1_VERSION)
801 int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
802 if (mode == EVP_CIPH_CBC_MODE)
804 eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
808 /* Need explicit part of IV for GCM mode */
809 else if (mode == EVP_CIPH_GCM_MODE)
810 eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
817 /* lets setup the record stuff. */
820 wr->input=(unsigned char *)buf;
822 /* we now 'read' from wr->input, wr->length bytes into
825 /* first we compress */
826 if (s->compress != NULL)
828 if (!ssl3_do_compress(s))
830 SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
836 memcpy(wr->data,wr->input,wr->length);
840 /* we should still have the output to wr->data and the input
841 * from wr->input. Length should be wr->length.
842 * wr->data still points in the wb->buf */
846 if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0)
848 wr->length+=mac_size;
856 /* if (RAND_pseudo_bytes(p, eivlen) <= 0)
858 wr->length += eivlen;
861 if(s->method->ssl3_enc->enc(s,1)<1) goto err;
863 /* record length after mac and block padding */
864 s2n(wr->length,plen);
866 /* we should now have
867 * wr->data pointing to the encrypted data, which is
869 wr->type=type; /* not needed but helps for debugging */
870 wr->length+=SSL3_RT_HEADER_LENGTH;
872 if (create_empty_fragment)
874 /* we are in a recursive call;
875 * just return the length, don't write out anything here
880 /* now let's set up wb */
881 wb->left = prefix_len + wr->length;
883 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
884 s->s3->wpend_tot=len;
885 s->s3->wpend_buf=buf;
886 s->s3->wpend_type=type;
887 s->s3->wpend_ret=len;
889 /* we now just need to write the buffer */
890 return ssl3_write_pending(s,type,buf,len);
895 /* if s->s3->wbuf.left != 0, we need to call this */
896 int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
900 SSL3_BUFFER *wb=&(s->s3->wbuf);
903 if ((s->s3->wpend_tot > (int)len)
904 || ((s->s3->wpend_buf != buf) &&
905 !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
906 || (s->s3->wpend_type != type))
908 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
917 s->rwstate=SSL_WRITING;
919 (char *)&(wb->buf[wb->offset]),
920 (unsigned int)wb->left);
924 SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
931 if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
932 SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
933 ssl3_release_write_buffer(s);
934 s->rwstate=SSL_NOTHING;
935 return(s->s3->wpend_ret);
938 if (s->version == DTLS1_VERSION ||
939 s->version == DTLS1_BAD_VER) {
940 /* For DTLS, just drop it. That's kind of the whole
941 point in using a datagram service */
951 /* Return up to 'len' payload bytes received in 'type' records.
952 * 'type' is one of the following:
954 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
955 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
956 * - 0 (during a shutdown, no data has to be returned)
958 * If we don't have stored data to work from, read a SSL/TLS record first
959 * (possibly multiple records if we still don't have anything to return).
961 * This function must handle any surprises the peer may have for us, such as
962 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
963 * a surprise, but handled as if it were), or renegotiation requests.
964 * Also if record payloads contain fragments too small to process, we store
965 * them until there is enough for the respective protocol (the record protocol
966 * may use arbitrary fragmentation and even interleaving):
967 * Change cipher spec protocol
968 * just 1 byte needed, no need for keeping anything stored
970 * 2 bytes needed (AlertLevel, AlertDescription)
972 * 4 bytes needed (HandshakeType, uint24 length) -- we just have
973 * to detect unexpected Client Hello and Hello Request messages
974 * here, anything else is handled by higher layers
975 * Application data protocol
976 * none of our business
978 int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
983 void (*cb)(const SSL *ssl,int type2,int val)=NULL;
985 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
986 if (!ssl3_setup_read_buffer(s))
989 if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE)) ||
990 (peek && (type != SSL3_RT_APPLICATION_DATA)))
992 SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
996 if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
997 /* (partially) satisfy request from storage */
999 unsigned char *src = s->s3->handshake_fragment;
1000 unsigned char *dst = buf;
1005 while ((len > 0) && (s->s3->handshake_fragment_len > 0))
1008 len--; s->s3->handshake_fragment_len--;
1011 /* move any remaining fragment bytes: */
1012 for (k = 0; k < s->s3->handshake_fragment_len; k++)
1013 s->s3->handshake_fragment[k] = *src++;
1017 /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
1019 if (!s->in_handshake && SSL_in_init(s))
1021 /* type == SSL3_RT_APPLICATION_DATA */
1022 i=s->handshake_func(s);
1023 if (i < 0) return(i);
1026 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1031 s->rwstate=SSL_NOTHING;
1033 /* s->s3->rrec.type - is the type of record
1034 * s->s3->rrec.data, - data
1035 * s->s3->rrec.off, - offset into 'data' for next read
1036 * s->s3->rrec.length, - number of bytes. */
1037 rr = &(s->s3->rrec);
1039 /* get new packet if necessary */
1040 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
1042 ret=ssl3_get_record(s);
1043 if (ret <= 0) return(ret);
1046 /* we now have a packet which can be read and processed */
1048 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
1049 * reset by ssl3_get_finished */
1050 && (rr->type != SSL3_RT_HANDSHAKE))
1052 al=SSL_AD_UNEXPECTED_MESSAGE;
1053 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
1057 /* If the other end has shut down, throw anything we read away
1058 * (even in 'peek' mode) */
1059 if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
1062 s->rwstate=SSL_NOTHING;
1067 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
1069 /* make sure that we are not getting application data when we
1070 * are doing a handshake for the first time */
1071 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
1072 (s->enc_read_ctx == NULL))
1074 al=SSL_AD_UNEXPECTED_MESSAGE;
1075 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
1079 if (len <= 0) return(len);
1081 if ((unsigned int)len > rr->length)
1084 n = (unsigned int)len;
1086 memcpy(buf,&(rr->data[rr->off]),n);
1091 if (rr->length == 0)
1093 s->rstate=SSL_ST_READ_HEADER;
1095 if (s->mode & SSL_MODE_RELEASE_BUFFERS && s->s3->rbuf.left == 0)
1096 ssl3_release_read_buffer(s);
1103 /* If we get here, then type != rr->type; if we have a handshake
1104 * message, then it was unexpected (Hello Request or Client Hello). */
1106 /* In case of record types for which we have 'fragment' storage,
1107 * fill that so that we can process the data at a fixed place.
1110 unsigned int dest_maxlen = 0;
1111 unsigned char *dest = NULL;
1112 unsigned int *dest_len = NULL;
1114 if (rr->type == SSL3_RT_HANDSHAKE)
1116 dest_maxlen = sizeof s->s3->handshake_fragment;
1117 dest = s->s3->handshake_fragment;
1118 dest_len = &s->s3->handshake_fragment_len;
1120 else if (rr->type == SSL3_RT_ALERT)
1122 dest_maxlen = sizeof s->s3->alert_fragment;
1123 dest = s->s3->alert_fragment;
1124 dest_len = &s->s3->alert_fragment_len;
1126 #ifndef OPENSSL_NO_HEARTBEATS
1127 else if (rr->type == TLS1_RT_HEARTBEAT)
1129 tls1_process_heartbeat(s);
1131 /* Exit and notify application to read again */
1133 s->rwstate=SSL_READING;
1134 BIO_clear_retry_flags(SSL_get_rbio(s));
1135 BIO_set_retry_read(SSL_get_rbio(s));
1140 if (dest_maxlen > 0)
1142 n = dest_maxlen - *dest_len; /* available space in 'dest' */
1144 n = rr->length; /* available bytes */
1146 /* now move 'n' bytes: */
1149 dest[(*dest_len)++] = rr->data[rr->off++];
1153 if (*dest_len < dest_maxlen)
1154 goto start; /* fragment was too small */
1158 /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
1159 * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
1160 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
1162 /* If we are a client, check for an incoming 'Hello Request': */
1164 (s->s3->handshake_fragment_len >= 4) &&
1165 (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
1166 (s->session != NULL) && (s->session->cipher != NULL))
1168 s->s3->handshake_fragment_len = 0;
1170 if ((s->s3->handshake_fragment[1] != 0) ||
1171 (s->s3->handshake_fragment[2] != 0) ||
1172 (s->s3->handshake_fragment[3] != 0))
1174 al=SSL_AD_DECODE_ERROR;
1175 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
1179 if (s->msg_callback)
1180 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
1182 if (SSL_is_init_finished(s) &&
1183 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
1184 !s->s3->renegotiate)
1186 ssl3_renegotiate(s);
1187 if (ssl3_renegotiate_check(s))
1189 i=s->handshake_func(s);
1190 if (i < 0) return(i);
1193 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1197 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1199 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1202 /* In the case where we try to read application data,
1203 * but we trigger an SSL handshake, we return -1 with
1204 * the retry option set. Otherwise renegotiation may
1205 * cause nasty problems in the blocking world */
1206 s->rwstate=SSL_READING;
1207 bio=SSL_get_rbio(s);
1208 BIO_clear_retry_flags(bio);
1209 BIO_set_retry_read(bio);
1215 /* we either finished a handshake or ignored the request,
1216 * now try again to obtain the (application) data we were asked for */
1219 /* If we are a server and get a client hello when renegotiation isn't
1220 * allowed send back a no renegotiation alert and carry on.
1221 * WARNING: experimental code, needs reviewing (steve)
1224 SSL_is_init_finished(s) &&
1225 !s->s3->send_connection_binding &&
1226 (s->version > SSL3_VERSION) &&
1227 (s->s3->handshake_fragment_len >= 4) &&
1228 (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
1229 (s->session != NULL) && (s->session->cipher != NULL) &&
1230 !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1233 /*s->s3->handshake_fragment_len = 0;*/
1235 ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
1238 if (s->s3->alert_fragment_len >= 2)
1240 int alert_level = s->s3->alert_fragment[0];
1241 int alert_descr = s->s3->alert_fragment[1];
1243 s->s3->alert_fragment_len = 0;
1245 if (s->msg_callback)
1246 s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
1248 if (s->info_callback != NULL)
1249 cb=s->info_callback;
1250 else if (s->ctx->info_callback != NULL)
1251 cb=s->ctx->info_callback;
1255 j = (alert_level << 8) | alert_descr;
1256 cb(s, SSL_CB_READ_ALERT, j);
1259 if (alert_level == 1) /* warning */
1261 s->s3->warn_alert = alert_descr;
1262 if (alert_descr == SSL_AD_CLOSE_NOTIFY)
1264 s->shutdown |= SSL_RECEIVED_SHUTDOWN;
1267 /* This is a warning but we receive it if we requested
1268 * renegotiation and the peer denied it. Terminate with
1269 * a fatal alert because if application tried to
1270 * renegotiatie it presumably had a good reason and
1271 * expects it to succeed.
1273 * In future we might have a renegotiation where we
1274 * don't care if the peer refused it where we carry on.
1276 else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
1278 al = SSL_AD_HANDSHAKE_FAILURE;
1279 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION);
1282 #ifdef SSL_AD_MISSING_SRP_USERNAME
1283 else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
1287 else if (alert_level == 2) /* fatal */
1291 s->rwstate=SSL_NOTHING;
1292 s->s3->fatal_alert = alert_descr;
1293 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
1294 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
1295 ERR_add_error_data(2,"SSL alert number ",tmp);
1296 s->shutdown|=SSL_RECEIVED_SHUTDOWN;
1297 SSL_CTX_remove_session(s->ctx,s->session);
1302 al=SSL_AD_ILLEGAL_PARAMETER;
1303 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
1310 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
1312 s->rwstate=SSL_NOTHING;
1317 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
1319 /* 'Change Cipher Spec' is just a single byte, so we know
1320 * exactly what the record payload has to look like */
1321 if ( (rr->length != 1) || (rr->off != 0) ||
1322 (rr->data[0] != SSL3_MT_CCS))
1324 al=SSL_AD_ILLEGAL_PARAMETER;
1325 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
1329 /* Check we have a cipher to change to */
1330 if (s->s3->tmp.new_cipher == NULL)
1332 al=SSL_AD_UNEXPECTED_MESSAGE;
1333 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1337 if (!(s->s3->flags & SSL3_FLAGS_CCS_OK))
1339 al=SSL_AD_UNEXPECTED_MESSAGE;
1340 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
1344 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
1348 if (s->msg_callback)
1349 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
1351 s->s3->change_cipher_spec=1;
1352 if (!ssl3_do_change_cipher_spec(s))
1358 /* Unexpected handshake message (Client Hello, or protocol violation) */
1359 if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
1361 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
1362 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
1364 #if 0 /* worked only because C operator preferences are not as expected (and
1365 * because this is not really needed for clients except for detecting
1366 * protocol violations): */
1367 s->state=SSL_ST_BEFORE|(s->server)
1371 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
1376 i=s->handshake_func(s);
1377 if (i < 0) return(i);
1380 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
1384 if (!(s->mode & SSL_MODE_AUTO_RETRY))
1386 if (s->s3->rbuf.left == 0) /* no read-ahead left? */
1389 /* In the case where we try to read application data,
1390 * but we trigger an SSL handshake, we return -1 with
1391 * the retry option set. Otherwise renegotiation may
1392 * cause nasty problems in the blocking world */
1393 s->rwstate=SSL_READING;
1394 bio=SSL_get_rbio(s);
1395 BIO_clear_retry_flags(bio);
1396 BIO_set_retry_read(bio);
1406 #ifndef OPENSSL_NO_TLS
1407 /* TLS up to v1.1 just ignores unknown message types:
1408 * TLS v1.2 give an unexpected message alert.
1410 if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION)
1416 al=SSL_AD_UNEXPECTED_MESSAGE;
1417 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1419 case SSL3_RT_CHANGE_CIPHER_SPEC:
1421 case SSL3_RT_HANDSHAKE:
1422 /* we already handled all of these, with the possible exception
1423 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
1424 * should not happen when type != rr->type */
1425 al=SSL_AD_UNEXPECTED_MESSAGE;
1426 SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
1428 case SSL3_RT_APPLICATION_DATA:
1429 /* At this point, we were expecting handshake data,
1430 * but have application data. If the library was
1431 * running inside ssl3_read() (i.e. in_read_app_data
1432 * is set) and it makes sense to read application data
1433 * at this point (session renegotiation not yet started),
1434 * we will indulge it.
1436 if (s->s3->in_read_app_data &&
1437 (s->s3->total_renegotiations != 0) &&
1439 (s->state & SSL_ST_CONNECT) &&
1440 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
1441 (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
1443 (s->state & SSL_ST_ACCEPT) &&
1444 (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
1445 (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
1449 s->s3->in_read_app_data=2;
1454 al=SSL_AD_UNEXPECTED_MESSAGE;
1455 SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
1462 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1467 int ssl3_do_change_cipher_spec(SSL *s)
1473 if (s->state & SSL_ST_ACCEPT)
1474 i=SSL3_CHANGE_CIPHER_SERVER_READ;
1476 i=SSL3_CHANGE_CIPHER_CLIENT_READ;
1478 if (s->s3->tmp.key_block == NULL)
1480 if (s->session == NULL || s->session->master_key_length == 0)
1482 /* might happen if dtls1_read_bytes() calls this */
1483 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
1487 s->session->cipher=s->s3->tmp.new_cipher;
1488 if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
1491 if (!s->method->ssl3_enc->change_cipher_state(s,i))
1494 /* we have to record the message digest at
1495 * this point so we can get it before we read
1496 * the finished message */
1497 if (s->state & SSL_ST_CONNECT)
1499 sender=s->method->ssl3_enc->server_finished_label;
1500 slen=s->method->ssl3_enc->server_finished_label_len;
1504 sender=s->method->ssl3_enc->client_finished_label;
1505 slen=s->method->ssl3_enc->client_finished_label_len;
1508 i = s->method->ssl3_enc->final_finish_mac(s,
1509 sender,slen,s->s3->tmp.peer_finish_md);
1512 SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
1515 s->s3->tmp.peer_finish_md_len = i;
1520 int ssl3_send_alert(SSL *s, int level, int desc)
1522 /* Map tls/ssl alert value to correct one */
1523 desc=s->method->ssl3_enc->alert_value(desc);
1524 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
1525 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
1526 if (desc < 0) return -1;
1527 /* If a fatal one, remove from cache */
1528 if ((level == 2) && (s->session != NULL))
1529 SSL_CTX_remove_session(s->ctx,s->session);
1531 s->s3->alert_dispatch=1;
1532 s->s3->send_alert[0]=level;
1533 s->s3->send_alert[1]=desc;
1534 if (s->s3->wbuf.left == 0) /* data still being written out? */
1535 return s->method->ssl_dispatch_alert(s);
1536 /* else data is still being written out, we will get written
1537 * some time in the future */
1541 int ssl3_dispatch_alert(SSL *s)
1544 void (*cb)(const SSL *ssl,int type,int val)=NULL;
1546 s->s3->alert_dispatch=0;
1547 i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
1550 s->s3->alert_dispatch=1;
1554 /* Alert sent to BIO. If it is important, flush it now.
1555 * If the message does not get sent due to non-blocking IO,
1556 * we will not worry too much. */
1557 if (s->s3->send_alert[0] == SSL3_AL_FATAL)
1558 (void)BIO_flush(s->wbio);
1560 if (s->msg_callback)
1561 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
1563 if (s->info_callback != NULL)
1564 cb=s->info_callback;
1565 else if (s->ctx->info_callback != NULL)
1566 cb=s->ctx->info_callback;
1570 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
1571 cb(s,SSL_CB_WRITE_ALERT,j);