e5bf62f716
Replace the hard coded value 8 (the size of the sequence number) with a constant defined in a macro. Reviewed-by: Richard Levitte <levitte@openssl.org>
218 lines
8.6 KiB
C
218 lines
8.6 KiB
C
/* ssl/record/dtls1_bitmap.c */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1998-2015 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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*
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*/
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/* 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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#include "../ssl_locl.h"
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#include "record_locl.h"
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/* mod 128 saturating subtract of two 64-bit values in big-endian order */
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static int satsub64be(const unsigned char *v1, const unsigned char *v2)
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{
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int ret, sat, brw, i;
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if (sizeof(long) == 8)
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do {
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const union {
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long one;
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char little;
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} is_endian = {
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1
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};
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long l;
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if (is_endian.little)
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break;
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/* not reached on little-endians */
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/*
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* following test is redundant, because input is always aligned,
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* but I take no chances...
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*/
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if (((size_t)v1 | (size_t)v2) & 0x7)
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break;
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l = *((long *)v1);
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l -= *((long *)v2);
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if (l > 128)
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return 128;
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else if (l < -128)
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return -128;
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else
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return (int)l;
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} while (0);
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ret = (int)v1[7] - (int)v2[7];
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sat = 0;
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brw = ret >> 8; /* brw is either 0 or -1 */
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if (ret & 0x80) {
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for (i = 6; i >= 0; i--) {
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brw += (int)v1[i] - (int)v2[i];
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sat |= ~brw;
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brw >>= 8;
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}
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} else {
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for (i = 6; i >= 0; i--) {
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brw += (int)v1[i] - (int)v2[i];
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sat |= brw;
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brw >>= 8;
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}
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}
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brw <<= 8; /* brw is either 0 or -256 */
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if (sat & 0xff)
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return brw | 0x80;
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else
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return brw + (ret & 0xFF);
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}
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int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap)
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{
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int cmp;
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unsigned int shift;
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const unsigned char *seq = s->rlayer.read_sequence;
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cmp = satsub64be(seq, bitmap->max_seq_num);
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if (cmp > 0) {
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SSL3_RECORD_set_seq_num(RECORD_LAYER_get_rrec(&s->rlayer), seq);
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return 1; /* this record in new */
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}
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shift = -cmp;
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if (shift >= sizeof(bitmap->map) * 8)
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return 0; /* stale, outside the window */
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else if (bitmap->map & (1UL << shift))
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return 0; /* record previously received */
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SSL3_RECORD_set_seq_num(RECORD_LAYER_get_rrec(&s->rlayer), seq);
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return 1;
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}
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void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
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{
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int cmp;
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unsigned int shift;
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const unsigned char *seq = RECORD_LAYER_get_read_sequence(&s->rlayer);
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cmp = satsub64be(seq, bitmap->max_seq_num);
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if (cmp > 0) {
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shift = cmp;
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if (shift < sizeof(bitmap->map) * 8)
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bitmap->map <<= shift, bitmap->map |= 1UL;
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else
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bitmap->map = 1UL;
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memcpy(bitmap->max_seq_num, seq, SEQ_NUM_SIZE);
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} else {
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shift = -cmp;
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if (shift < sizeof(bitmap->map) * 8)
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bitmap->map |= 1UL << shift;
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}
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}
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