48105fa215
Limit the number of empty records that will be processed consecutively in order to prevent ssl3_get_record from never returning. Reported by "oftc_must_be_destroyed" and George Kadianakis.
1525 lines
43 KiB
C
1525 lines
43 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <openssl/buf.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/mem.h>
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#include <openssl/rand.h>
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#include "ssl_locl.h"
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static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
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unsigned int len, int create_empty_fragment);
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static int ssl3_get_record(SSL *s);
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int ssl3_read_n(SSL *s, int n, int max, int extend)
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{
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/* If extend == 0, obtain new n-byte packet; if extend == 1, increase
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* packet by another n bytes.
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* The packet will be in the sub-array of s->s3->rbuf.buf specified
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* by s->packet and s->packet_length.
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* (If s->read_ahead is set, 'max' bytes may be stored in rbuf
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* [plus s->packet_length bytes if extend == 1].)
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*/
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int i,len,left;
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long align=0;
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unsigned char *pkt;
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SSL3_BUFFER *rb;
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if (n <= 0) return n;
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rb = &(s->s3->rbuf);
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if (rb->buf == NULL)
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if (!ssl3_setup_read_buffer(s))
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return -1;
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left = rb->left;
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#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
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align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
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align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
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#endif
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if (!extend)
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{
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/* start with empty packet ... */
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if (left == 0)
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rb->offset = align;
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else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
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{
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/* check if next packet length is large
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* enough to justify payload alignment... */
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pkt = rb->buf + rb->offset;
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if (pkt[0] == SSL3_RT_APPLICATION_DATA
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&& (pkt[3]<<8|pkt[4]) >= 128)
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{
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/* Note that even if packet is corrupted
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* and its length field is insane, we can
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* only be led to wrong decision about
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* whether memmove will occur or not.
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* Header values has no effect on memmove
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* arguments and therefore no buffer
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* overrun can be triggered. */
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memmove (rb->buf+align,pkt,left);
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rb->offset = align;
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}
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}
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s->packet = rb->buf + rb->offset;
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s->packet_length = 0;
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/* ... now we can act as if 'extend' was set */
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}
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/* For DTLS/UDP reads should not span multiple packets
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* because the read operation returns the whole packet
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* at once (as long as it fits into the buffer). */
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if (SSL_IS_DTLS(s))
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{
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if (left > 0 && n > left)
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n = left;
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}
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/* if there is enough in the buffer from a previous read, take some */
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if (left >= n)
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{
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s->packet_length+=n;
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rb->left=left-n;
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rb->offset+=n;
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return(n);
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}
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/* else we need to read more data */
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len = s->packet_length;
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pkt = rb->buf+align;
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/* Move any available bytes to front of buffer:
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* 'len' bytes already pointed to by 'packet',
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* 'left' extra ones at the end */
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if (s->packet != pkt) /* len > 0 */
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{
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memmove(pkt, s->packet, len+left);
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s->packet = pkt;
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rb->offset = len + align;
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}
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if (n > (int)(rb->len - rb->offset)) /* does not happen */
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{
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OPENSSL_PUT_ERROR(SSL, ssl3_read_n, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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if (!s->read_ahead)
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/* ignore max parameter */
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max = n;
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else
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{
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if (max < n)
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max = n;
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if (max > (int)(rb->len - rb->offset))
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max = rb->len - rb->offset;
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}
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while (left < n)
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{
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/* Now we have len+left bytes at the front of s->s3->rbuf.buf
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* and need to read in more until we have len+n (up to
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* len+max if possible) */
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ERR_clear_system_error();
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if (s->rbio != NULL)
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{
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s->rwstate=SSL_READING;
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i=BIO_read(s->rbio,pkt+len+left, max-left);
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}
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else
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{
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OPENSSL_PUT_ERROR(SSL, ssl3_read_n, SSL_R_READ_BIO_NOT_SET);
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i = -1;
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}
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if (i <= 0)
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{
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rb->left = left;
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if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
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!SSL_IS_DTLS(s))
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if (len+left == 0)
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ssl3_release_read_buffer(s);
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return(i);
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}
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left+=i;
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/* reads should *never* span multiple packets for DTLS because
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* the underlying transport protocol is message oriented as opposed
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* to byte oriented as in the TLS case. */
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if (SSL_IS_DTLS(s))
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{
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if (n > left)
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n = left; /* makes the while condition false */
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}
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}
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/* done reading, now the book-keeping */
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rb->offset += n;
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rb->left = left - n;
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s->packet_length += n;
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s->rwstate=SSL_NOTHING;
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return(n);
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}
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/* MAX_EMPTY_RECORDS defines the number of consecutive, empty records that will
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* be processed per call to ssl3_get_record. Without this limit an attacker
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* could send empty records at a faster rate than we can process and cause
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* ssl3_get_record to loop forever. */
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#define MAX_EMPTY_RECORDS 32
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/* Call this to get a new input record.
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* It will return <= 0 if more data is needed, normally due to an error
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* or non-blocking IO.
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* When it finishes, one packet has been decoded and can be found in
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* ssl->s3->rrec.type - is the type of record
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* ssl->s3->rrec.data, - data
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* ssl->s3->rrec.length, - number of bytes
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*/
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/* used only by ssl3_read_bytes */
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static int ssl3_get_record(SSL *s)
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{
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int ssl_major,ssl_minor,al;
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int enc_err,n,i,ret= -1;
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SSL3_RECORD *rr;
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SSL_SESSION *sess;
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unsigned char *p;
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unsigned char md[EVP_MAX_MD_SIZE];
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short version;
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unsigned mac_size, orig_len;
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size_t extra;
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unsigned empty_record_count = 0;
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rr= &(s->s3->rrec);
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sess=s->session;
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if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
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extra=SSL3_RT_MAX_EXTRA;
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else
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extra=0;
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if (extra && !s->s3->init_extra)
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{
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/* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
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* set after ssl3_setup_buffers() was done */
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OPENSSL_PUT_ERROR(SSL, ssl3_get_record, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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again:
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/* check if we have the header */
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if ( (s->rstate != SSL_ST_READ_BODY) ||
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(s->packet_length < SSL3_RT_HEADER_LENGTH))
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{
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n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
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if (n <= 0) return(n); /* error or non-blocking */
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s->rstate=SSL_ST_READ_BODY;
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p=s->packet;
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if (s->msg_callback)
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s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
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|
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/* Pull apart the header into the SSL3_RECORD */
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rr->type= *(p++);
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ssl_major= *(p++);
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ssl_minor= *(p++);
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version=(ssl_major<<8)|ssl_minor;
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n2s(p,rr->length);
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#if 0
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fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
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#endif
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|
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/* Lets check version */
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if (!s->first_packet)
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{
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if (version != s->version)
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{
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OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_WRONG_VERSION_NUMBER);
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if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
|
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/* Send back error using their minor version number :-) */
|
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s->version = (unsigned short)version;
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al=SSL_AD_PROTOCOL_VERSION;
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goto f_err;
|
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}
|
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}
|
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|
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if ((version>>8) != SSL3_VERSION_MAJOR)
|
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{
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OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_WRONG_VERSION_NUMBER);
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goto err;
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}
|
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|
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if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
|
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{
|
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al=SSL_AD_RECORD_OVERFLOW;
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OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_PACKET_LENGTH_TOO_LONG);
|
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goto f_err;
|
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}
|
|
|
|
/* now s->rstate == SSL_ST_READ_BODY */
|
|
}
|
|
|
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/* s->rstate == SSL_ST_READ_BODY, get and decode the data */
|
|
|
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if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
|
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{
|
|
/* now s->packet_length == SSL3_RT_HEADER_LENGTH */
|
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i=rr->length;
|
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n=ssl3_read_n(s,i,i,1);
|
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if (n <= 0) return(n); /* error or non-blocking io */
|
|
/* now n == rr->length,
|
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* and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
|
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}
|
|
|
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s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
|
|
|
|
/* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
|
|
* and we have that many bytes in s->packet
|
|
*/
|
|
rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
|
|
|
|
/* ok, we can now read from 's->packet' data into 'rr'
|
|
* rr->input points at rr->length bytes, which
|
|
* need to be copied into rr->data by either
|
|
* the decryption or by the decompression
|
|
* When the data is 'copied' into the rr->data buffer,
|
|
* rr->input will be pointed at the new buffer */
|
|
|
|
/* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
|
|
* rr->length bytes of encrypted compressed stuff. */
|
|
|
|
/* check is not needed I believe */
|
|
if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
|
|
/* decrypt in place in 'rr->input' */
|
|
rr->data=rr->input;
|
|
|
|
enc_err = s->method->ssl3_enc->enc(s,0);
|
|
/* enc_err is:
|
|
* 0: (in non-constant time) if the record is publically invalid.
|
|
* 1: if the padding is valid
|
|
* -1: if the padding is invalid */
|
|
if (enc_err == 0)
|
|
{
|
|
al=SSL_AD_DECRYPTION_FAILED;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
|
|
goto f_err;
|
|
}
|
|
|
|
#ifdef TLS_DEBUG
|
|
printf("dec %d\n",rr->length);
|
|
{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
|
|
printf("\n");
|
|
#endif
|
|
|
|
/* r->length is now the compressed data plus mac */
|
|
if ((sess != NULL) &&
|
|
(s->enc_read_ctx != NULL) &&
|
|
(EVP_MD_CTX_md(s->read_hash) != NULL))
|
|
{
|
|
/* s->read_hash != NULL => mac_size != -1 */
|
|
unsigned char *mac = NULL;
|
|
unsigned char mac_tmp[EVP_MAX_MD_SIZE];
|
|
mac_size=EVP_MD_CTX_size(s->read_hash);
|
|
assert(mac_size <= EVP_MAX_MD_SIZE);
|
|
|
|
/* kludge: *_cbc_remove_padding passes padding length in rr->type */
|
|
orig_len = rr->length+((unsigned int)rr->type>>8);
|
|
|
|
/* orig_len is the length of the record before any padding was
|
|
* removed. This is public information, as is the MAC in use,
|
|
* therefore we can safely process the record in a different
|
|
* amount of time if it's too short to possibly contain a MAC.
|
|
*/
|
|
if (orig_len < mac_size ||
|
|
/* CBC records must have a padding length byte too. */
|
|
(EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
|
|
orig_len < mac_size+1))
|
|
{
|
|
al=SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_LENGTH_TOO_SHORT);
|
|
goto f_err;
|
|
}
|
|
|
|
if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
|
|
{
|
|
/* We update the length so that the TLS header bytes
|
|
* can be constructed correctly but we need to extract
|
|
* the MAC in constant time from within the record,
|
|
* without leaking the contents of the padding bytes.
|
|
* */
|
|
mac = mac_tmp;
|
|
ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
|
|
rr->length -= mac_size;
|
|
}
|
|
else
|
|
{
|
|
/* In this case there's no padding, so |orig_len|
|
|
* equals |rec->length| and we checked that there's
|
|
* enough bytes for |mac_size| above. */
|
|
rr->length -= mac_size;
|
|
mac = &rr->data[rr->length];
|
|
}
|
|
|
|
i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
|
|
if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
|
|
enc_err = -1;
|
|
if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
|
|
enc_err = -1;
|
|
}
|
|
|
|
if (enc_err < 0)
|
|
{
|
|
/* A separate 'decryption_failed' alert was introduced with TLS 1.0,
|
|
* SSL 3.0 only has 'bad_record_mac'. But unless a decryption
|
|
* failure is directly visible from the ciphertext anyway,
|
|
* we should not reveal which kind of error occured -- this
|
|
* might become visible to an attacker (e.g. via a logfile) */
|
|
al=SSL_AD_BAD_RECORD_MAC;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
|
|
goto f_err;
|
|
}
|
|
|
|
/* r->length is now just compressed */
|
|
if (s->expand != NULL)
|
|
{
|
|
if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_COMPRESSED_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
if (!ssl3_do_uncompress(s))
|
|
{
|
|
al=SSL_AD_DECOMPRESSION_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_BAD_DECOMPRESSION);
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_DATA_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
|
|
rr->off=0;
|
|
/* So at this point the following is true
|
|
* ssl->s3->rrec.type is the type of record
|
|
* ssl->s3->rrec.length == number of bytes in record
|
|
* ssl->s3->rrec.off == offset to first valid byte
|
|
* ssl->s3->rrec.data == where to take bytes from, increment
|
|
* after use :-).
|
|
*/
|
|
|
|
/* we have pulled in a full packet so zero things */
|
|
s->packet_length=0;
|
|
|
|
/* just read a 0 length packet */
|
|
if (rr->length == 0)
|
|
{
|
|
empty_record_count++;
|
|
if (empty_record_count > MAX_EMPTY_RECORDS)
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_get_record, SSL_R_TOO_MANY_EMPTY_FRAGMENTS);
|
|
goto f_err;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
#if 0
|
|
fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
|
|
#endif
|
|
|
|
return(1);
|
|
|
|
f_err:
|
|
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
err:
|
|
return(ret);
|
|
}
|
|
|
|
int ssl3_do_uncompress(SSL *ssl)
|
|
{
|
|
return(1);
|
|
}
|
|
|
|
int ssl3_do_compress(SSL *ssl)
|
|
{
|
|
return(1);
|
|
}
|
|
|
|
/* Call this to write data in records of type 'type'
|
|
* It will return <= 0 if not all data has been sent or non-blocking IO.
|
|
*/
|
|
int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
|
|
{
|
|
const unsigned char *buf=buf_;
|
|
unsigned int tot,n,nw;
|
|
int i;
|
|
|
|
s->rwstate=SSL_NOTHING;
|
|
tot=s->s3->wnum;
|
|
s->s3->wnum=0;
|
|
|
|
if (SSL_in_init(s) && !s->in_handshake)
|
|
{
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_write_bytes, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
n=(len-tot);
|
|
for (;;)
|
|
{
|
|
if (n > s->max_send_fragment)
|
|
nw=s->max_send_fragment;
|
|
else
|
|
nw=n;
|
|
|
|
i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
|
|
if (i <= 0)
|
|
{
|
|
s->s3->wnum=tot;
|
|
return i;
|
|
}
|
|
|
|
if ((i == (int)n) ||
|
|
(type == SSL3_RT_APPLICATION_DATA &&
|
|
(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
|
|
{
|
|
/* next chunk of data should get another prepended empty fragment
|
|
* in ciphersuites with known-IV weakness: */
|
|
s->s3->empty_fragment_done = 0;
|
|
|
|
return tot+i;
|
|
}
|
|
|
|
n-=i;
|
|
tot+=i;
|
|
}
|
|
}
|
|
|
|
static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
|
|
unsigned int len, int create_empty_fragment)
|
|
{
|
|
unsigned char *p,*plen;
|
|
int i,mac_size,clear=0;
|
|
int prefix_len=0;
|
|
int eivlen;
|
|
long align=0;
|
|
SSL3_RECORD *wr;
|
|
SSL3_BUFFER *wb=&(s->s3->wbuf);
|
|
SSL_SESSION *sess;
|
|
|
|
if (wb->buf == NULL)
|
|
if (!ssl3_setup_write_buffer(s))
|
|
return -1;
|
|
|
|
/* first check if there is a SSL3_BUFFER still being written
|
|
* out. This will happen with non blocking IO */
|
|
if (wb->left != 0)
|
|
return(ssl3_write_pending(s,type,buf,len));
|
|
|
|
/* If we have an alert to send, lets send it */
|
|
if (s->s3->alert_dispatch)
|
|
{
|
|
i=s->method->ssl_dispatch_alert(s);
|
|
if (i <= 0)
|
|
return(i);
|
|
/* if it went, fall through and send more stuff */
|
|
}
|
|
|
|
if (len == 0 && !create_empty_fragment)
|
|
return 0;
|
|
|
|
wr= &(s->s3->wrec);
|
|
sess=s->session;
|
|
|
|
if ( (sess == NULL) ||
|
|
(s->enc_write_ctx == NULL) ||
|
|
(EVP_MD_CTX_md(s->write_hash) == NULL))
|
|
{
|
|
#if 1
|
|
clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */
|
|
#else
|
|
clear=1;
|
|
#endif
|
|
mac_size=0;
|
|
}
|
|
else
|
|
{
|
|
mac_size=EVP_MD_CTX_size(s->write_hash);
|
|
if (mac_size < 0)
|
|
goto err;
|
|
}
|
|
|
|
/* 'create_empty_fragment' is true only when this function calls itself */
|
|
if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
|
|
{
|
|
/* countermeasure against known-IV weakness in CBC ciphersuites
|
|
* (see http://www.openssl.org/~bodo/tls-cbc.txt) */
|
|
|
|
if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
|
|
{
|
|
/* recursive function call with 'create_empty_fragment' set;
|
|
* this prepares and buffers the data for an empty fragment
|
|
* (these 'prefix_len' bytes are sent out later
|
|
* together with the actual payload) */
|
|
prefix_len = do_ssl3_write(s, type, buf, 0, 1);
|
|
if (prefix_len <= 0)
|
|
goto err;
|
|
|
|
if (prefix_len >
|
|
(SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
|
|
{
|
|
/* insufficient space */
|
|
OPENSSL_PUT_ERROR(SSL, do_ssl3_write, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
s->s3->empty_fragment_done = 1;
|
|
}
|
|
|
|
if (create_empty_fragment)
|
|
{
|
|
#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
|
|
/* extra fragment would be couple of cipher blocks,
|
|
* which would be multiple of SSL3_ALIGN_PAYLOAD, so
|
|
* if we want to align the real payload, then we can
|
|
* just pretent we simply have two headers. */
|
|
align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
|
|
align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
|
|
#endif
|
|
p = wb->buf + align;
|
|
wb->offset = align;
|
|
}
|
|
else if (prefix_len)
|
|
{
|
|
p = wb->buf + wb->offset + prefix_len;
|
|
}
|
|
else
|
|
{
|
|
#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
|
|
align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
|
|
align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
|
|
#endif
|
|
p = wb->buf + align;
|
|
wb->offset = align;
|
|
}
|
|
|
|
/* write the header */
|
|
|
|
*(p++)=type&0xff;
|
|
wr->type=type;
|
|
|
|
*(p++)=(s->version>>8);
|
|
/* Some servers hang if iniatial client hello is larger than 256
|
|
* bytes and record version number > TLS 1.0
|
|
*/
|
|
if (s->state == SSL3_ST_CW_CLNT_HELLO_B
|
|
&& !s->renegotiate
|
|
&& TLS1_get_version(s) > TLS1_VERSION)
|
|
*(p++) = 0x1;
|
|
else
|
|
*(p++)=s->version&0xff;
|
|
|
|
/* field where we are to write out packet length */
|
|
plen=p;
|
|
p+=2;
|
|
/* Explicit IV length, block ciphers appropriate version flag */
|
|
if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s))
|
|
{
|
|
int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
|
|
if (mode == EVP_CIPH_CBC_MODE)
|
|
{
|
|
eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
|
|
if (eivlen <= 1)
|
|
eivlen = 0;
|
|
}
|
|
/* Need explicit part of IV for GCM mode */
|
|
else if (mode == EVP_CIPH_GCM_MODE)
|
|
eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
|
else
|
|
eivlen = 0;
|
|
}
|
|
else
|
|
eivlen = 0;
|
|
|
|
/* lets setup the record stuff. */
|
|
wr->data=p + eivlen;
|
|
wr->length=(int)len;
|
|
wr->input=(unsigned char *)buf;
|
|
|
|
/* we now 'read' from wr->input, wr->length bytes into
|
|
* wr->data */
|
|
|
|
/* first we compress */
|
|
if (s->compress != NULL)
|
|
{
|
|
if (!ssl3_do_compress(s))
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, do_ssl3_write, SSL_R_COMPRESSION_FAILURE);
|
|
goto err;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
memcpy(wr->data,wr->input,wr->length);
|
|
wr->input=wr->data;
|
|
}
|
|
|
|
/* we should still have the output to wr->data and the input
|
|
* from wr->input. Length should be wr->length.
|
|
* wr->data still points in the wb->buf */
|
|
|
|
if (mac_size != 0)
|
|
{
|
|
if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0)
|
|
goto err;
|
|
wr->length+=mac_size;
|
|
}
|
|
|
|
wr->input=p;
|
|
wr->data=p;
|
|
|
|
if (eivlen)
|
|
{
|
|
/* if (RAND_pseudo_bytes(p, eivlen) <= 0)
|
|
goto err; */
|
|
wr->length += eivlen;
|
|
}
|
|
|
|
/* ssl3_enc can only have an error on read */
|
|
s->method->ssl3_enc->enc(s,1);
|
|
|
|
/* record length after mac and block padding */
|
|
s2n(wr->length,plen);
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, s->msg_callback_arg);
|
|
|
|
/* we should now have
|
|
* wr->data pointing to the encrypted data, which is
|
|
* wr->length long */
|
|
wr->type=type; /* not needed but helps for debugging */
|
|
wr->length+=SSL3_RT_HEADER_LENGTH;
|
|
|
|
if (create_empty_fragment)
|
|
{
|
|
/* we are in a recursive call;
|
|
* just return the length, don't write out anything here
|
|
*/
|
|
return wr->length;
|
|
}
|
|
|
|
/* now let's set up wb */
|
|
wb->left = prefix_len + wr->length;
|
|
|
|
/* memorize arguments so that ssl3_write_pending can detect bad write retries later */
|
|
s->s3->wpend_tot=len;
|
|
s->s3->wpend_buf=buf;
|
|
s->s3->wpend_type=type;
|
|
s->s3->wpend_ret=len;
|
|
|
|
/* we now just need to write the buffer */
|
|
return ssl3_write_pending(s,type,buf,len);
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
/* if s->s3->wbuf.left != 0, we need to call this */
|
|
int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
|
|
unsigned int len)
|
|
{
|
|
int i;
|
|
SSL3_BUFFER *wb=&(s->s3->wbuf);
|
|
|
|
/* XXXX */
|
|
if ((s->s3->wpend_tot > (int)len)
|
|
|| ((s->s3->wpend_buf != buf) &&
|
|
!(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
|
|
|| (s->s3->wpend_type != type))
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_write_pending, SSL_R_BAD_WRITE_RETRY);
|
|
return(-1);
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
ERR_clear_system_error();
|
|
if (s->wbio != NULL)
|
|
{
|
|
s->rwstate=SSL_WRITING;
|
|
i=BIO_write(s->wbio,
|
|
(char *)&(wb->buf[wb->offset]),
|
|
(unsigned int)wb->left);
|
|
}
|
|
else
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_write_pending, SSL_R_BIO_NOT_SET);
|
|
i= -1;
|
|
}
|
|
if (i == wb->left)
|
|
{
|
|
wb->left=0;
|
|
wb->offset+=i;
|
|
if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
|
|
!SSL_IS_DTLS(s))
|
|
ssl3_release_write_buffer(s);
|
|
s->rwstate=SSL_NOTHING;
|
|
return(s->s3->wpend_ret);
|
|
}
|
|
else if (i <= 0) {
|
|
if (s->version == DTLS1_VERSION ||
|
|
s->version == DTLS1_BAD_VER) {
|
|
/* For DTLS, just drop it. That's kind of the whole
|
|
point in using a datagram service */
|
|
wb->left = 0;
|
|
}
|
|
return(i);
|
|
}
|
|
wb->offset+=i;
|
|
wb->left-=i;
|
|
}
|
|
}
|
|
|
|
/* Return up to 'len' payload bytes received in 'type' records.
|
|
* 'type' is one of the following:
|
|
*
|
|
* - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
|
|
* - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
|
|
* - 0 (during a shutdown, no data has to be returned)
|
|
*
|
|
* If we don't have stored data to work from, read a SSL/TLS record first
|
|
* (possibly multiple records if we still don't have anything to return).
|
|
*
|
|
* This function must handle any surprises the peer may have for us, such as
|
|
* Alert records (e.g. close_notify), ChangeCipherSpec records (not really
|
|
* a surprise, but handled as if it were), or renegotiation requests.
|
|
* Also if record payloads contain fragments too small to process, we store
|
|
* them until there is enough for the respective protocol (the record protocol
|
|
* may use arbitrary fragmentation and even interleaving):
|
|
* Change cipher spec protocol
|
|
* just 1 byte needed, no need for keeping anything stored
|
|
* Alert protocol
|
|
* 2 bytes needed (AlertLevel, AlertDescription)
|
|
* Handshake protocol
|
|
* 4 bytes needed (HandshakeType, uint24 length) -- we just have
|
|
* to detect unexpected Client Hello and Hello Request messages
|
|
* here, anything else is handled by higher layers
|
|
* Application data protocol
|
|
* none of our business
|
|
*/
|
|
int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
|
|
{
|
|
int al,i,j,ret;
|
|
unsigned int n;
|
|
SSL3_RECORD *rr;
|
|
void (*cb)(const SSL *ssl,int type2,int val)=NULL;
|
|
|
|
if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
|
|
if (!ssl3_setup_read_buffer(s))
|
|
return(-1);
|
|
|
|
if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
|
|
(peek && (type != SSL3_RT_APPLICATION_DATA)))
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
|
|
/* (partially) satisfy request from storage */
|
|
{
|
|
unsigned char *src = s->s3->handshake_fragment;
|
|
unsigned char *dst = buf;
|
|
unsigned int k;
|
|
|
|
/* peek == 0 */
|
|
n = 0;
|
|
while ((len > 0) && (s->s3->handshake_fragment_len > 0))
|
|
{
|
|
*dst++ = *src++;
|
|
len--; s->s3->handshake_fragment_len--;
|
|
n++;
|
|
}
|
|
/* move any remaining fragment bytes: */
|
|
for (k = 0; k < s->s3->handshake_fragment_len; k++)
|
|
s->s3->handshake_fragment[k] = *src++;
|
|
return n;
|
|
}
|
|
|
|
/* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
|
|
|
|
if (!s->in_handshake && SSL_in_init(s))
|
|
{
|
|
/* type == SSL3_RT_APPLICATION_DATA */
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
}
|
|
start:
|
|
s->rwstate=SSL_NOTHING;
|
|
|
|
/* s->s3->rrec.type - is the type of record
|
|
* s->s3->rrec.data, - data
|
|
* s->s3->rrec.off, - offset into 'data' for next read
|
|
* s->s3->rrec.length, - number of bytes. */
|
|
rr = &(s->s3->rrec);
|
|
|
|
/* get new packet if necessary */
|
|
if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
|
|
{
|
|
ret=ssl3_get_record(s);
|
|
if (ret <= 0) return(ret);
|
|
}
|
|
|
|
/* we now have a packet which can be read and processed */
|
|
|
|
if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
|
|
* reset by ssl3_get_finished */
|
|
&& (rr->type != SSL3_RT_HANDSHAKE))
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
|
|
goto f_err;
|
|
}
|
|
|
|
/* If the other end has shut down, throw anything we read away
|
|
* (even in 'peek' mode) */
|
|
if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
|
|
{
|
|
rr->length=0;
|
|
s->rwstate=SSL_NOTHING;
|
|
return(0);
|
|
}
|
|
|
|
|
|
if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
|
|
{
|
|
/* make sure that we are not getting application data when we
|
|
* are doing a handshake for the first time */
|
|
if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
|
|
(s->enc_read_ctx == NULL))
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_APP_DATA_IN_HANDSHAKE);
|
|
goto f_err;
|
|
}
|
|
|
|
if (len <= 0) return(len);
|
|
|
|
if ((unsigned int)len > rr->length)
|
|
n = rr->length;
|
|
else
|
|
n = (unsigned int)len;
|
|
|
|
memcpy(buf,&(rr->data[rr->off]),n);
|
|
if (!peek)
|
|
{
|
|
rr->length-=n;
|
|
rr->off+=n;
|
|
if (rr->length == 0)
|
|
{
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
rr->off=0;
|
|
if (s->mode & SSL_MODE_RELEASE_BUFFERS)
|
|
ssl3_release_read_buffer(s);
|
|
}
|
|
}
|
|
return(n);
|
|
}
|
|
|
|
|
|
/* If we get here, then type != rr->type; if we have a handshake
|
|
* message, then it was unexpected (Hello Request or Client Hello). */
|
|
|
|
/* In case of record types for which we have 'fragment' storage,
|
|
* fill that so that we can process the data at a fixed place.
|
|
*/
|
|
{
|
|
unsigned int dest_maxlen = 0;
|
|
unsigned char *dest = NULL;
|
|
unsigned int *dest_len = NULL;
|
|
|
|
if (rr->type == SSL3_RT_HANDSHAKE)
|
|
{
|
|
dest_maxlen = sizeof s->s3->handshake_fragment;
|
|
dest = s->s3->handshake_fragment;
|
|
dest_len = &s->s3->handshake_fragment_len;
|
|
}
|
|
else if (rr->type == SSL3_RT_ALERT)
|
|
{
|
|
dest_maxlen = sizeof s->s3->alert_fragment;
|
|
dest = s->s3->alert_fragment;
|
|
dest_len = &s->s3->alert_fragment_len;
|
|
}
|
|
#ifndef OPENSSL_NO_HEARTBEATS
|
|
else if (rr->type == TLS1_RT_HEARTBEAT)
|
|
{
|
|
tls1_process_heartbeat(s);
|
|
|
|
/* Exit and notify application to read again */
|
|
rr->length = 0;
|
|
s->rwstate=SSL_READING;
|
|
BIO_clear_retry_flags(SSL_get_rbio(s));
|
|
BIO_set_retry_read(SSL_get_rbio(s));
|
|
return(-1);
|
|
}
|
|
#endif
|
|
|
|
if (dest_maxlen > 0)
|
|
{
|
|
n = dest_maxlen - *dest_len; /* available space in 'dest' */
|
|
if (rr->length < n)
|
|
n = rr->length; /* available bytes */
|
|
|
|
/* now move 'n' bytes: */
|
|
while (n-- > 0)
|
|
{
|
|
dest[(*dest_len)++] = rr->data[rr->off++];
|
|
rr->length--;
|
|
}
|
|
|
|
if (*dest_len < dest_maxlen)
|
|
goto start; /* fragment was too small */
|
|
}
|
|
}
|
|
|
|
/* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
|
|
* s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
|
|
* (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
|
|
|
|
/* If we are a client, check for an incoming 'Hello Request': */
|
|
if ((!s->server) &&
|
|
(s->s3->handshake_fragment_len >= 4) &&
|
|
(s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
|
|
(s->session != NULL) && (s->session->cipher != NULL))
|
|
{
|
|
s->s3->handshake_fragment_len = 0;
|
|
|
|
if ((s->s3->handshake_fragment[1] != 0) ||
|
|
(s->s3->handshake_fragment[2] != 0) ||
|
|
(s->s3->handshake_fragment[3] != 0))
|
|
{
|
|
al=SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_BAD_HELLO_REQUEST);
|
|
goto f_err;
|
|
}
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
|
|
|
|
if (SSL_is_init_finished(s) &&
|
|
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
|
|
!s->s3->renegotiate)
|
|
{
|
|
ssl3_renegotiate(s);
|
|
if (ssl3_renegotiate_check(s))
|
|
{
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
|
|
if (!(s->mode & SSL_MODE_AUTO_RETRY))
|
|
{
|
|
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
|
|
{
|
|
BIO *bio;
|
|
/* In the case where we try to read application data,
|
|
* but we trigger an SSL handshake, we return -1 with
|
|
* the retry option set. Otherwise renegotiation may
|
|
* cause nasty problems in the blocking world */
|
|
s->rwstate=SSL_READING;
|
|
bio=SSL_get_rbio(s);
|
|
BIO_clear_retry_flags(bio);
|
|
BIO_set_retry_read(bio);
|
|
return(-1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* we either finished a handshake or ignored the request,
|
|
* now try again to obtain the (application) data we were asked for */
|
|
goto start;
|
|
}
|
|
/* If we are a server and get a client hello when renegotiation isn't
|
|
* allowed send back a no renegotiation alert and carry on.
|
|
* WARNING: experimental code, needs reviewing (steve)
|
|
*/
|
|
if (s->server &&
|
|
SSL_is_init_finished(s) &&
|
|
!s->s3->send_connection_binding &&
|
|
(s->version > SSL3_VERSION) &&
|
|
(s->s3->handshake_fragment_len >= 4) &&
|
|
(s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
|
|
(s->session != NULL) && (s->session->cipher != NULL) &&
|
|
!(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
|
|
|
|
{
|
|
/*s->s3->handshake_fragment_len = 0;*/
|
|
rr->length = 0;
|
|
ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
|
|
goto start;
|
|
}
|
|
if (s->s3->alert_fragment_len >= 2)
|
|
{
|
|
int alert_level = s->s3->alert_fragment[0];
|
|
int alert_descr = s->s3->alert_fragment[1];
|
|
|
|
s->s3->alert_fragment_len = 0;
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
|
|
|
|
if (s->info_callback != NULL)
|
|
cb=s->info_callback;
|
|
else if (s->ctx->info_callback != NULL)
|
|
cb=s->ctx->info_callback;
|
|
|
|
if (cb != NULL)
|
|
{
|
|
j = (alert_level << 8) | alert_descr;
|
|
cb(s, SSL_CB_READ_ALERT, j);
|
|
}
|
|
|
|
if (alert_level == 1) /* warning */
|
|
{
|
|
s->s3->warn_alert = alert_descr;
|
|
if (alert_descr == SSL_AD_CLOSE_NOTIFY)
|
|
{
|
|
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
|
return(0);
|
|
}
|
|
/* This is a warning but we receive it if we requested
|
|
* renegotiation and the peer denied it. Terminate with
|
|
* a fatal alert because if application tried to
|
|
* renegotiatie it presumably had a good reason and
|
|
* expects it to succeed.
|
|
*
|
|
* In future we might have a renegotiation where we
|
|
* don't care if the peer refused it where we carry on.
|
|
*/
|
|
else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
|
|
{
|
|
al = SSL_AD_HANDSHAKE_FAILURE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_NO_RENEGOTIATION);
|
|
goto f_err;
|
|
}
|
|
#ifdef SSL_AD_MISSING_SRP_USERNAME
|
|
else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
|
|
return(0);
|
|
#endif
|
|
}
|
|
else if (alert_level == 2) /* fatal */
|
|
{
|
|
char tmp[16];
|
|
|
|
s->rwstate=SSL_NOTHING;
|
|
s->s3->fatal_alert = alert_descr;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_AD_REASON_OFFSET + alert_descr);
|
|
BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
|
|
ERR_add_error_data(2,"SSL alert number ",tmp);
|
|
s->shutdown|=SSL_RECEIVED_SHUTDOWN;
|
|
SSL_CTX_remove_session(s->ctx,s->session);
|
|
return(0);
|
|
}
|
|
else
|
|
{
|
|
al=SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_UNKNOWN_ALERT_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
goto start;
|
|
}
|
|
|
|
if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
|
|
{
|
|
s->rwstate=SSL_NOTHING;
|
|
rr->length=0;
|
|
return(0);
|
|
}
|
|
|
|
if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
|
|
{
|
|
/* 'Change Cipher Spec' is just a single byte, so we know
|
|
* exactly what the record payload has to look like */
|
|
if ( (rr->length != 1) || (rr->off != 0) ||
|
|
(rr->data[0] != SSL3_MT_CCS))
|
|
{
|
|
al=SSL_AD_ILLEGAL_PARAMETER;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_BAD_CHANGE_CIPHER_SPEC);
|
|
goto f_err;
|
|
}
|
|
|
|
/* Check we have a cipher to change to */
|
|
if (s->s3->tmp.new_cipher == NULL)
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_CCS_RECEIVED_EARLY);
|
|
goto f_err;
|
|
}
|
|
|
|
rr->length=0;
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
|
|
|
|
s->s3->change_cipher_spec=1;
|
|
if (!ssl3_do_change_cipher_spec(s))
|
|
goto err;
|
|
else
|
|
goto start;
|
|
}
|
|
|
|
/* Unexpected handshake message (Client Hello, or protocol violation) */
|
|
if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
|
|
{
|
|
if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
|
|
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
|
|
{
|
|
#if 0 /* worked only because C operator preferences are not as expected (and
|
|
* because this is not really needed for clients except for detecting
|
|
* protocol violations): */
|
|
s->state=SSL_ST_BEFORE|(s->server)
|
|
?SSL_ST_ACCEPT
|
|
:SSL_ST_CONNECT;
|
|
#else
|
|
s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
|
|
#endif
|
|
s->renegotiate=1;
|
|
s->new_session=1;
|
|
}
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
|
|
if (!(s->mode & SSL_MODE_AUTO_RETRY))
|
|
{
|
|
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
|
|
{
|
|
BIO *bio;
|
|
/* In the case where we try to read application data,
|
|
* but we trigger an SSL handshake, we return -1 with
|
|
* the retry option set. Otherwise renegotiation may
|
|
* cause nasty problems in the blocking world */
|
|
s->rwstate=SSL_READING;
|
|
bio=SSL_get_rbio(s);
|
|
BIO_clear_retry_flags(bio);
|
|
BIO_set_retry_read(bio);
|
|
return(-1);
|
|
}
|
|
}
|
|
goto start;
|
|
}
|
|
|
|
switch (rr->type)
|
|
{
|
|
default:
|
|
#ifndef OPENSSL_NO_TLS
|
|
/* TLS up to v1.1 just ignores unknown message types:
|
|
* TLS v1.2 give an unexpected message alert.
|
|
*/
|
|
if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION)
|
|
{
|
|
rr->length = 0;
|
|
goto start;
|
|
}
|
|
#endif
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
case SSL3_RT_CHANGE_CIPHER_SPEC:
|
|
case SSL3_RT_ALERT:
|
|
case SSL3_RT_HANDSHAKE:
|
|
/* we already handled all of these, with the possible exception
|
|
* of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
|
|
* should not happen when type != rr->type */
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, ERR_R_INTERNAL_ERROR);
|
|
goto f_err;
|
|
case SSL3_RT_APPLICATION_DATA:
|
|
/* At this point, we were expecting handshake data,
|
|
* but have application data. If the library was
|
|
* running inside ssl3_read() (i.e. in_read_app_data
|
|
* is set) and it makes sense to read application data
|
|
* at this point (session renegotiation not yet started),
|
|
* we will indulge it.
|
|
*/
|
|
if (s->s3->in_read_app_data &&
|
|
(s->s3->total_renegotiations != 0) &&
|
|
((
|
|
(s->state & SSL_ST_CONNECT) &&
|
|
(s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
|
|
(s->state <= SSL3_ST_CR_SRVR_HELLO_A)
|
|
) || (
|
|
(s->state & SSL_ST_ACCEPT) &&
|
|
(s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
|
|
(s->state >= SSL3_ST_SR_CLNT_HELLO_A)
|
|
)
|
|
))
|
|
{
|
|
s->s3->in_read_app_data=2;
|
|
return(-1);
|
|
}
|
|
else
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_read_bytes, SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
}
|
|
}
|
|
/* not reached */
|
|
|
|
f_err:
|
|
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
err:
|
|
return(-1);
|
|
}
|
|
|
|
int ssl3_do_change_cipher_spec(SSL *s)
|
|
{
|
|
int i;
|
|
const char *sender;
|
|
int slen;
|
|
|
|
if (s->state & SSL_ST_ACCEPT)
|
|
i=SSL3_CHANGE_CIPHER_SERVER_READ;
|
|
else
|
|
i=SSL3_CHANGE_CIPHER_CLIENT_READ;
|
|
|
|
if (s->s3->tmp.key_block == NULL)
|
|
{
|
|
if (s->session == NULL)
|
|
{
|
|
/* might happen if dtls1_read_bytes() calls this */
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_do_change_cipher_spec, SSL_R_CCS_RECEIVED_EARLY);
|
|
return (0);
|
|
}
|
|
|
|
s->session->cipher=s->s3->tmp.new_cipher;
|
|
if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
|
|
}
|
|
|
|
if (!s->method->ssl3_enc->change_cipher_state(s,i))
|
|
return(0);
|
|
|
|
/* we have to record the message digest at
|
|
* this point so we can get it before we read
|
|
* the finished message */
|
|
if (s->state & SSL_ST_CONNECT)
|
|
{
|
|
sender=s->method->ssl3_enc->server_finished_label;
|
|
slen=s->method->ssl3_enc->server_finished_label_len;
|
|
}
|
|
else
|
|
{
|
|
sender=s->method->ssl3_enc->client_finished_label;
|
|
slen=s->method->ssl3_enc->client_finished_label_len;
|
|
}
|
|
|
|
i = s->method->ssl3_enc->final_finish_mac(s,
|
|
sender,slen,s->s3->tmp.peer_finish_md);
|
|
if (i == 0)
|
|
{
|
|
OPENSSL_PUT_ERROR(SSL, ssl3_do_change_cipher_spec, ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
s->s3->tmp.peer_finish_md_len = i;
|
|
|
|
return(1);
|
|
}
|
|
|
|
int ssl3_send_alert(SSL *s, int level, int desc)
|
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{
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/* Map tls/ssl alert value to correct one */
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desc=s->method->ssl3_enc->alert_value(desc);
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if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
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desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
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if (desc < 0) return -1;
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/* If a fatal one, remove from cache */
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if ((level == 2) && (s->session != NULL))
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SSL_CTX_remove_session(s->ctx,s->session);
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s->s3->alert_dispatch=1;
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s->s3->send_alert[0]=level;
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s->s3->send_alert[1]=desc;
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if (s->s3->wbuf.left == 0) /* data still being written out? */
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return s->method->ssl_dispatch_alert(s);
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/* else data is still being written out, we will get written
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* some time in the future */
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return -1;
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}
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int ssl3_dispatch_alert(SSL *s)
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{
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int i,j;
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void (*cb)(const SSL *ssl,int type,int val)=NULL;
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s->s3->alert_dispatch=0;
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i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
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if (i <= 0)
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{
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s->s3->alert_dispatch=1;
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}
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else
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{
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/* Alert sent to BIO. If it is important, flush it now.
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* If the message does not get sent due to non-blocking IO,
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* we will not worry too much. */
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if (s->s3->send_alert[0] == SSL3_AL_FATAL)
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(void)BIO_flush(s->wbio);
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if (s->msg_callback)
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s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
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if (s->info_callback != NULL)
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cb=s->info_callback;
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else if (s->ctx->info_callback != NULL)
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cb=s->ctx->info_callback;
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if (cb != NULL)
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{
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j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
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cb(s,SSL_CB_WRITE_ALERT,j);
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}
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}
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return(i);
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}
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