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1247 lines
36 KiB
C
Executable File
1247 lines
36 KiB
C
Executable File
/* $OpenBSD: d1_both.c,v 1.60 2020/09/26 14:43:17 jsing Exp $ */
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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) 1998-2005 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 <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "ssl_locl.h"
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include "pqueue.h"
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#include "bytestring.h"
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#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
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#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
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if ((end) - (start) <= 8) { \
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long ii; \
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for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
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} else { \
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long ii; \
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bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
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for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
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bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
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} }
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#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
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long ii; \
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OPENSSL_assert((msg_len) > 0); \
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is_complete = 1; \
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if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
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if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
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if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
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static unsigned char bitmask_start_values[] = {
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0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80
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};
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static unsigned char bitmask_end_values[] = {
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0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f
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};
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/* XDTLS: figure out the right values */
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static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
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static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
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static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
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unsigned long frag_len);
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static int dtls1_write_message_header(const struct hm_header_st *msg_hdr,
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unsigned long frag_off, unsigned long frag_len, unsigned char *p);
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static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
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int *ok);
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void dtls1_hm_fragment_free(hm_fragment *frag);
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static hm_fragment *
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dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
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{
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hm_fragment *frag;
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if ((frag = calloc(1, sizeof(*frag))) == NULL)
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goto err;
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if (frag_len > 0) {
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if ((frag->fragment = calloc(1, frag_len)) == NULL)
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goto err;
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}
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/* Initialize reassembly bitmask if necessary. */
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if (reassembly) {
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if ((frag->reassembly = calloc(1,
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RSMBLY_BITMASK_SIZE(frag_len))) == NULL)
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goto err;
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}
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return frag;
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err:
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dtls1_hm_fragment_free(frag);
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return NULL;
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}
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void
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dtls1_hm_fragment_free(hm_fragment *frag)
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{
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if (frag == NULL)
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return;
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if (frag->msg_header.is_ccs) {
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EVP_CIPHER_CTX_free(
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frag->msg_header.saved_retransmit_state.enc_write_ctx);
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EVP_MD_CTX_free(
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frag->msg_header.saved_retransmit_state.write_hash);
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}
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free(frag->fragment);
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free(frag->reassembly);
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free(frag);
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}
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/* send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
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int
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dtls1_do_write(SSL *s, int type)
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{
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int ret;
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int curr_mtu;
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unsigned int len, frag_off, mac_size, blocksize;
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/* AHA! Figure out the MTU, and stick to the right size */
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if (D1I(s)->mtu < dtls1_min_mtu() &&
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!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
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D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
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BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
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/*
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* I've seen the kernel return bogus numbers when it
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* doesn't know the MTU (ie., the initial write), so just
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* make sure we have a reasonable number
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*/
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if (D1I(s)->mtu < dtls1_min_mtu()) {
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D1I(s)->mtu = 0;
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D1I(s)->mtu = dtls1_guess_mtu(D1I(s)->mtu);
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BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
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D1I(s)->mtu, NULL);
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}
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}
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OPENSSL_assert(D1I(s)->mtu >= dtls1_min_mtu());
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/* should have something reasonable now */
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if (s->internal->init_off == 0 && type == SSL3_RT_HANDSHAKE)
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OPENSSL_assert(s->internal->init_num ==
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(int)D1I(s)->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
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if (s->internal->write_hash)
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mac_size = EVP_MD_CTX_size(s->internal->write_hash);
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else
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mac_size = 0;
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if (s->internal->enc_write_ctx &&
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(EVP_CIPHER_mode( s->internal->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
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blocksize = 2 * EVP_CIPHER_block_size(s->internal->enc_write_ctx->cipher);
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else
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blocksize = 0;
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frag_off = 0;
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while (s->internal->init_num) {
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curr_mtu = D1I(s)->mtu - BIO_wpending(SSL_get_wbio(s)) -
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DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
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if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) {
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/* grr.. we could get an error if MTU picked was wrong */
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ret = BIO_flush(SSL_get_wbio(s));
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if (ret <= 0)
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return ret;
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curr_mtu = D1I(s)->mtu - DTLS1_RT_HEADER_LENGTH -
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mac_size - blocksize;
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}
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if (s->internal->init_num > curr_mtu)
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len = curr_mtu;
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else
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len = s->internal->init_num;
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|
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/* XDTLS: this function is too long. split out the CCS part */
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if (type == SSL3_RT_HANDSHAKE) {
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if (s->internal->init_off != 0) {
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OPENSSL_assert(s->internal->init_off > DTLS1_HM_HEADER_LENGTH);
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s->internal->init_off -= DTLS1_HM_HEADER_LENGTH;
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s->internal->init_num += DTLS1_HM_HEADER_LENGTH;
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if (s->internal->init_num > curr_mtu)
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len = curr_mtu;
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else
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len = s->internal->init_num;
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}
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dtls1_fix_message_header(s, frag_off,
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len - DTLS1_HM_HEADER_LENGTH);
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if (!dtls1_write_message_header(&D1I(s)->w_msg_hdr,
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D1I(s)->w_msg_hdr.frag_off, D1I(s)->w_msg_hdr.frag_len,
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(unsigned char *)&s->internal->init_buf->data[s->internal->init_off]))
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return -1;
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OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
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}
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ret = dtls1_write_bytes(s, type,
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&s->internal->init_buf->data[s->internal->init_off], len);
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if (ret < 0) {
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/*
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* Might need to update MTU here, but we don't know
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* which previous packet caused the failure -- so
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* can't really retransmit anything. continue as
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* if everything is fine and wait for an alert to
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* handle the retransmit
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*/
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if (BIO_ctrl(SSL_get_wbio(s),
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BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0)
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D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
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BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
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else
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return (-1);
|
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} else {
|
|
|
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/*
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* Bad if this assert fails, only part of the
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* handshake message got sent. but why would
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* this happen?
|
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*/
|
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OPENSSL_assert(len == (unsigned int)ret);
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|
|
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if (type == SSL3_RT_HANDSHAKE &&
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!D1I(s)->retransmitting) {
|
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/*
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* Should not be done for 'Hello Request's,
|
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* but in that case we'll ignore the result
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* anyway
|
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*/
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unsigned char *p = (unsigned char *)&s->internal->init_buf->data[s->internal->init_off];
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const struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
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int xlen;
|
|
|
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if (frag_off == 0) {
|
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/*
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* Reconstruct message header is if it
|
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* is being sent in single fragment
|
|
*/
|
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if (!dtls1_write_message_header(msg_hdr,
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0, msg_hdr->msg_len, p))
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return (-1);
|
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xlen = ret;
|
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} else {
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p += DTLS1_HM_HEADER_LENGTH;
|
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xlen = ret - DTLS1_HM_HEADER_LENGTH;
|
|
}
|
|
|
|
tls1_transcript_record(s, p, xlen);
|
|
}
|
|
|
|
if (ret == s->internal->init_num) {
|
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if (s->internal->msg_callback)
|
|
s->internal->msg_callback(1, s->version, type,
|
|
s->internal->init_buf->data,
|
|
(size_t)(s->internal->init_off + s->internal->init_num),
|
|
s, s->internal->msg_callback_arg);
|
|
|
|
s->internal->init_off = 0;
|
|
/* done writing this message */
|
|
s->internal->init_num = 0;
|
|
|
|
return (1);
|
|
}
|
|
s->internal->init_off += ret;
|
|
s->internal->init_num -= ret;
|
|
frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Obtain handshake message of message type 'mt' (any if mt == -1),
|
|
* maximum acceptable body length 'max'.
|
|
* Read an entire handshake message. Handshake messages arrive in
|
|
* fragments.
|
|
*/
|
|
long
|
|
dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
|
|
{
|
|
int i, al;
|
|
struct hm_header_st *msg_hdr;
|
|
unsigned char *p;
|
|
unsigned long msg_len;
|
|
|
|
/*
|
|
* s3->internal->tmp is used to store messages that are unexpected, caused
|
|
* by the absence of an optional handshake message
|
|
*/
|
|
if (S3I(s)->tmp.reuse_message) {
|
|
S3I(s)->tmp.reuse_message = 0;
|
|
if ((mt >= 0) && (S3I(s)->tmp.message_type != mt)) {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
|
|
goto f_err;
|
|
}
|
|
*ok = 1;
|
|
s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
|
|
s->internal->init_num = (int)S3I(s)->tmp.message_size;
|
|
return s->internal->init_num;
|
|
}
|
|
|
|
msg_hdr = &D1I(s)->r_msg_hdr;
|
|
memset(msg_hdr, 0, sizeof(struct hm_header_st));
|
|
|
|
again:
|
|
i = dtls1_get_message_fragment(s, st1, stn, max, ok);
|
|
if (i == DTLS1_HM_BAD_FRAGMENT ||
|
|
i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
|
|
goto again;
|
|
else if (i <= 0 && !*ok)
|
|
return i;
|
|
|
|
p = (unsigned char *)s->internal->init_buf->data;
|
|
msg_len = msg_hdr->msg_len;
|
|
|
|
/* reconstruct message header */
|
|
if (!dtls1_write_message_header(msg_hdr, 0, msg_len, p))
|
|
return -1;
|
|
|
|
msg_len += DTLS1_HM_HEADER_LENGTH;
|
|
|
|
tls1_transcript_record(s, p, msg_len);
|
|
if (s->internal->msg_callback)
|
|
s->internal->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, msg_len,
|
|
s, s->internal->msg_callback_arg);
|
|
|
|
memset(msg_hdr, 0, sizeof(struct hm_header_st));
|
|
|
|
/* Don't change sequence numbers while listening */
|
|
if (!D1I(s)->listen)
|
|
D1I(s)->handshake_read_seq++;
|
|
|
|
s->internal->init_msg = s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
|
|
return s->internal->init_num;
|
|
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
*ok = 0;
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int
|
|
dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr, int max)
|
|
{
|
|
size_t frag_off, frag_len, msg_len;
|
|
|
|
msg_len = msg_hdr->msg_len;
|
|
frag_off = msg_hdr->frag_off;
|
|
frag_len = msg_hdr->frag_len;
|
|
|
|
/* sanity checking */
|
|
if ((frag_off + frag_len) > msg_len) {
|
|
SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
|
|
return SSL_AD_ILLEGAL_PARAMETER;
|
|
}
|
|
|
|
if ((frag_off + frag_len) > (unsigned long)max) {
|
|
SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
|
|
return SSL_AD_ILLEGAL_PARAMETER;
|
|
}
|
|
|
|
if ( D1I(s)->r_msg_hdr.frag_off == 0) /* first fragment */
|
|
{
|
|
/*
|
|
* msg_len is limited to 2^24, but is effectively checked
|
|
* against max above
|
|
*/
|
|
if (!BUF_MEM_grow_clean(s->internal->init_buf,
|
|
msg_len + DTLS1_HM_HEADER_LENGTH)) {
|
|
SSLerror(s, ERR_R_BUF_LIB);
|
|
return SSL_AD_INTERNAL_ERROR;
|
|
}
|
|
|
|
S3I(s)->tmp.message_size = msg_len;
|
|
D1I(s)->r_msg_hdr.msg_len = msg_len;
|
|
S3I(s)->tmp.message_type = msg_hdr->type;
|
|
D1I(s)->r_msg_hdr.type = msg_hdr->type;
|
|
D1I(s)->r_msg_hdr.seq = msg_hdr->seq;
|
|
} else if (msg_len != D1I(s)->r_msg_hdr.msg_len) {
|
|
/*
|
|
* They must be playing with us! BTW, failure to enforce
|
|
* upper limit would open possibility for buffer overrun.
|
|
*/
|
|
SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
|
|
return SSL_AD_ILLEGAL_PARAMETER;
|
|
}
|
|
|
|
return 0; /* no error */
|
|
}
|
|
|
|
static int
|
|
dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
|
|
{
|
|
/*
|
|
* (0) check whether the desired fragment is available
|
|
* if so:
|
|
* (1) copy over the fragment to s->internal->init_buf->data[]
|
|
* (2) update s->internal->init_num
|
|
*/
|
|
pitem *item;
|
|
hm_fragment *frag;
|
|
int al;
|
|
|
|
*ok = 0;
|
|
item = pqueue_peek(D1I(s)->buffered_messages);
|
|
if (item == NULL)
|
|
return 0;
|
|
|
|
frag = (hm_fragment *)item->data;
|
|
|
|
/* Don't return if reassembly still in progress */
|
|
if (frag->reassembly != NULL)
|
|
return 0;
|
|
|
|
if (D1I(s)->handshake_read_seq == frag->msg_header.seq) {
|
|
unsigned long frag_len = frag->msg_header.frag_len;
|
|
pqueue_pop(D1I(s)->buffered_messages);
|
|
|
|
al = dtls1_preprocess_fragment(s, &frag->msg_header, max);
|
|
|
|
if (al == 0) /* no alert */
|
|
{
|
|
unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
|
|
memcpy(&p[frag->msg_header.frag_off],
|
|
frag->fragment, frag->msg_header.frag_len);
|
|
}
|
|
|
|
dtls1_hm_fragment_free(frag);
|
|
pitem_free(item);
|
|
|
|
if (al == 0) {
|
|
*ok = 1;
|
|
return frag_len;
|
|
}
|
|
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
s->internal->init_num = 0;
|
|
*ok = 0;
|
|
return -1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* dtls1_max_handshake_message_len returns the maximum number of bytes
|
|
* permitted in a DTLS handshake message for |s|. The minimum is 16KB,
|
|
* but may be greater if the maximum certificate list size requires it.
|
|
*/
|
|
static unsigned long
|
|
dtls1_max_handshake_message_len(const SSL *s)
|
|
{
|
|
unsigned long max_len;
|
|
|
|
max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
|
|
if (max_len < (unsigned long)s->internal->max_cert_list)
|
|
return s->internal->max_cert_list;
|
|
return max_len;
|
|
}
|
|
|
|
static int
|
|
dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
|
|
{
|
|
hm_fragment *frag = NULL;
|
|
pitem *item = NULL;
|
|
int i = -1, is_complete;
|
|
unsigned char seq64be[8];
|
|
unsigned long frag_len = msg_hdr->frag_len;
|
|
|
|
if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
|
|
msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
|
|
goto err;
|
|
|
|
if (frag_len == 0) {
|
|
i = DTLS1_HM_FRAGMENT_RETRY;
|
|
goto err;
|
|
}
|
|
|
|
/* Try to find item in queue */
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
|
|
seq64be[7] = (unsigned char)msg_hdr->seq;
|
|
item = pqueue_find(D1I(s)->buffered_messages, seq64be);
|
|
|
|
if (item == NULL) {
|
|
frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
|
|
if (frag == NULL)
|
|
goto err;
|
|
memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
|
|
frag->msg_header.frag_len = frag->msg_header.msg_len;
|
|
frag->msg_header.frag_off = 0;
|
|
} else {
|
|
frag = (hm_fragment*)item->data;
|
|
if (frag->msg_header.msg_len != msg_hdr->msg_len) {
|
|
item = NULL;
|
|
frag = NULL;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If message is already reassembled, this must be a
|
|
* retransmit and can be dropped.
|
|
*/
|
|
if (frag->reassembly == NULL) {
|
|
unsigned char devnull [256];
|
|
|
|
while (frag_len) {
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
|
|
devnull, frag_len > sizeof(devnull) ?
|
|
sizeof(devnull) : frag_len, 0);
|
|
if (i <= 0)
|
|
goto err;
|
|
frag_len -= i;
|
|
}
|
|
i = DTLS1_HM_FRAGMENT_RETRY;
|
|
goto err;
|
|
}
|
|
|
|
/* read the body of the fragment (header has already been read */
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
|
|
frag->fragment + msg_hdr->frag_off, frag_len, 0);
|
|
if (i <= 0 || (unsigned long)i != frag_len)
|
|
goto err;
|
|
|
|
RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
|
|
(long)(msg_hdr->frag_off + frag_len));
|
|
|
|
RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
|
|
is_complete);
|
|
|
|
if (is_complete) {
|
|
free(frag->reassembly);
|
|
frag->reassembly = NULL;
|
|
}
|
|
|
|
if (item == NULL) {
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
|
|
seq64be[7] = (unsigned char)(msg_hdr->seq);
|
|
|
|
item = pitem_new(seq64be, frag);
|
|
if (item == NULL) {
|
|
i = -1;
|
|
goto err;
|
|
}
|
|
|
|
pqueue_insert(D1I(s)->buffered_messages, item);
|
|
}
|
|
|
|
return DTLS1_HM_FRAGMENT_RETRY;
|
|
|
|
err:
|
|
if (item == NULL && frag != NULL)
|
|
dtls1_hm_fragment_free(frag);
|
|
*ok = 0;
|
|
return i;
|
|
}
|
|
|
|
|
|
static int
|
|
dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
|
|
{
|
|
int i = -1;
|
|
hm_fragment *frag = NULL;
|
|
pitem *item = NULL;
|
|
unsigned char seq64be[8];
|
|
unsigned long frag_len = msg_hdr->frag_len;
|
|
|
|
if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
|
|
goto err;
|
|
|
|
/* Try to find item in queue, to prevent duplicate entries */
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char) (msg_hdr->seq >> 8);
|
|
seq64be[7] = (unsigned char) msg_hdr->seq;
|
|
item = pqueue_find(D1I(s)->buffered_messages, seq64be);
|
|
|
|
/*
|
|
* If we already have an entry and this one is a fragment,
|
|
* don't discard it and rather try to reassemble it.
|
|
*/
|
|
if (item != NULL && frag_len < msg_hdr->msg_len)
|
|
item = NULL;
|
|
|
|
/*
|
|
* Discard the message if sequence number was already there, is
|
|
* too far in the future, already in the queue or if we received
|
|
* a FINISHED before the SERVER_HELLO, which then must be a stale
|
|
* retransmit.
|
|
*/
|
|
if (msg_hdr->seq <= D1I(s)->handshake_read_seq ||
|
|
msg_hdr->seq > D1I(s)->handshake_read_seq + 10 || item != NULL ||
|
|
(D1I(s)->handshake_read_seq == 0 &&
|
|
msg_hdr->type == SSL3_MT_FINISHED)) {
|
|
unsigned char devnull [256];
|
|
|
|
while (frag_len) {
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
|
|
devnull, frag_len > sizeof(devnull) ?
|
|
sizeof(devnull) : frag_len, 0);
|
|
if (i <= 0)
|
|
goto err;
|
|
frag_len -= i;
|
|
}
|
|
} else {
|
|
if (frag_len < msg_hdr->msg_len)
|
|
return dtls1_reassemble_fragment(s, msg_hdr, ok);
|
|
|
|
if (frag_len > dtls1_max_handshake_message_len(s))
|
|
goto err;
|
|
|
|
frag = dtls1_hm_fragment_new(frag_len, 0);
|
|
if (frag == NULL)
|
|
goto err;
|
|
|
|
memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
|
|
|
|
if (frag_len) {
|
|
/* read the body of the fragment (header has already been read */
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
|
|
frag->fragment, frag_len, 0);
|
|
if (i <= 0 || (unsigned long)i != frag_len)
|
|
goto err;
|
|
}
|
|
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
|
|
seq64be[7] = (unsigned char)(msg_hdr->seq);
|
|
|
|
item = pitem_new(seq64be, frag);
|
|
if (item == NULL)
|
|
goto err;
|
|
|
|
pqueue_insert(D1I(s)->buffered_messages, item);
|
|
}
|
|
|
|
return DTLS1_HM_FRAGMENT_RETRY;
|
|
|
|
err:
|
|
if (item == NULL && frag != NULL)
|
|
dtls1_hm_fragment_free(frag);
|
|
*ok = 0;
|
|
return i;
|
|
}
|
|
|
|
|
|
static long
|
|
dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
|
|
{
|
|
unsigned char wire[DTLS1_HM_HEADER_LENGTH];
|
|
unsigned long len, frag_off, frag_len;
|
|
int i, al;
|
|
struct hm_header_st msg_hdr;
|
|
|
|
again:
|
|
/* see if we have the required fragment already */
|
|
if ((frag_len = dtls1_retrieve_buffered_fragment(s, max, ok)) || *ok) {
|
|
if (*ok)
|
|
s->internal->init_num = frag_len;
|
|
return frag_len;
|
|
}
|
|
|
|
/* read handshake message header */
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, wire,
|
|
DTLS1_HM_HEADER_LENGTH, 0);
|
|
if (i <= 0) /* nbio, or an error */
|
|
{
|
|
s->internal->rwstate = SSL_READING;
|
|
*ok = 0;
|
|
return i;
|
|
}
|
|
/* Handshake fails if message header is incomplete */
|
|
if (i != DTLS1_HM_HEADER_LENGTH ||
|
|
/* parse the message fragment header */
|
|
dtls1_get_message_header(wire, &msg_hdr) == 0) {
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
|
|
goto f_err;
|
|
}
|
|
|
|
/*
|
|
* if this is a future (or stale) message it gets buffered
|
|
* (or dropped)--no further processing at this time
|
|
* While listening, we accept seq 1 (ClientHello with cookie)
|
|
* although we're still expecting seq 0 (ClientHello)
|
|
*/
|
|
if (msg_hdr.seq != D1I(s)->handshake_read_seq &&
|
|
!(D1I(s)->listen && msg_hdr.seq == 1))
|
|
return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
|
|
|
|
len = msg_hdr.msg_len;
|
|
frag_off = msg_hdr.frag_off;
|
|
frag_len = msg_hdr.frag_len;
|
|
|
|
if (frag_len && frag_len < len)
|
|
return dtls1_reassemble_fragment(s, &msg_hdr, ok);
|
|
|
|
if (!s->server && D1I(s)->r_msg_hdr.frag_off == 0 &&
|
|
wire[0] == SSL3_MT_HELLO_REQUEST) {
|
|
/*
|
|
* The server may always send 'Hello Request' messages --
|
|
* we are doing a handshake anyway now, so ignore them
|
|
* if their format is correct. Does not count for
|
|
* 'Finished' MAC.
|
|
*/
|
|
if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {
|
|
if (s->internal->msg_callback)
|
|
s->internal->msg_callback(0, s->version,
|
|
SSL3_RT_HANDSHAKE, wire,
|
|
DTLS1_HM_HEADER_LENGTH, s,
|
|
s->internal->msg_callback_arg);
|
|
|
|
s->internal->init_num = 0;
|
|
goto again;
|
|
}
|
|
else /* Incorrectly formated Hello request */
|
|
{
|
|
al = SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
if ((al = dtls1_preprocess_fragment(s, &msg_hdr, max)))
|
|
goto f_err;
|
|
|
|
/* XDTLS: ressurect this when restart is in place */
|
|
S3I(s)->hs.state = stn;
|
|
|
|
if (frag_len > 0) {
|
|
unsigned char *p = (unsigned char *)s->internal->init_buf->data + DTLS1_HM_HEADER_LENGTH;
|
|
|
|
i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
|
|
&p[frag_off], frag_len, 0);
|
|
/* XDTLS: fix this--message fragments cannot span multiple packets */
|
|
if (i <= 0) {
|
|
s->internal->rwstate = SSL_READING;
|
|
*ok = 0;
|
|
return i;
|
|
}
|
|
} else
|
|
i = 0;
|
|
|
|
/*
|
|
* XDTLS: an incorrectly formatted fragment should cause the
|
|
* handshake to fail
|
|
*/
|
|
if (i != (int)frag_len) {
|
|
al = SSL3_AD_ILLEGAL_PARAMETER;
|
|
SSLerror(s, SSL3_AD_ILLEGAL_PARAMETER);
|
|
goto f_err;
|
|
}
|
|
|
|
*ok = 1;
|
|
|
|
/*
|
|
* Note that s->internal->init_num is *not* used as current offset in
|
|
* s->internal->init_buf->data, but as a counter summing up fragments'
|
|
* lengths: as soon as they sum up to handshake packet
|
|
* length, we assume we have got all the fragments.
|
|
*/
|
|
s->internal->init_num = frag_len;
|
|
return frag_len;
|
|
|
|
f_err:
|
|
ssl3_send_alert(s, SSL3_AL_FATAL, al);
|
|
s->internal->init_num = 0;
|
|
|
|
*ok = 0;
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
dtls1_read_failed(SSL *s, int code)
|
|
{
|
|
if (code > 0) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "invalid state reached %s:%d",
|
|
__FILE__, __LINE__);
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
if (!dtls1_is_timer_expired(s)) {
|
|
/*
|
|
* not a timeout, none of our business, let higher layers
|
|
* handle this. in fact it's probably an error
|
|
*/
|
|
return code;
|
|
}
|
|
|
|
if (!SSL_in_init(s)) /* done, no need to send a retransmit */
|
|
{
|
|
BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
|
|
return code;
|
|
}
|
|
|
|
return dtls1_handle_timeout(s);
|
|
}
|
|
|
|
int
|
|
dtls1_get_queue_priority(unsigned short seq, int is_ccs)
|
|
{
|
|
/*
|
|
* The index of the retransmission queue actually is the message
|
|
* sequence number, since the queue only contains messages of a
|
|
* single handshake. However, the ChangeCipherSpec has no message
|
|
* sequence number and so using only the sequence will result in
|
|
* the CCS and Finished having the same index. To prevent this, the
|
|
* sequence number is multiplied by 2. In case of a CCS 1 is
|
|
* subtracted. This does not only differ CSS and Finished, it also
|
|
* maintains the order of the index (important for priority queues)
|
|
* and fits in the unsigned short variable.
|
|
*/
|
|
return seq * 2 - is_ccs;
|
|
}
|
|
|
|
int
|
|
dtls1_retransmit_buffered_messages(SSL *s)
|
|
{
|
|
pqueue sent = s->d1->sent_messages;
|
|
piterator iter;
|
|
pitem *item;
|
|
hm_fragment *frag;
|
|
int found = 0;
|
|
|
|
iter = pqueue_iterator(sent);
|
|
|
|
for (item = pqueue_next(&iter); item != NULL;
|
|
item = pqueue_next(&iter)) {
|
|
frag = (hm_fragment *)item->data;
|
|
if (dtls1_retransmit_message(s,
|
|
(unsigned short)dtls1_get_queue_priority(
|
|
frag->msg_header.seq, frag->msg_header.is_ccs), 0,
|
|
&found) <= 0 && found) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "dtls1_retransmit_message() failed\n");
|
|
#endif
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
dtls1_buffer_message(SSL *s, int is_ccs)
|
|
{
|
|
pitem *item;
|
|
hm_fragment *frag;
|
|
unsigned char seq64be[8];
|
|
|
|
/* Buffer the messsage in order to handle DTLS retransmissions. */
|
|
|
|
/*
|
|
* This function is called immediately after a message has
|
|
* been serialized
|
|
*/
|
|
OPENSSL_assert(s->internal->init_off == 0);
|
|
|
|
frag = dtls1_hm_fragment_new(s->internal->init_num, 0);
|
|
if (frag == NULL)
|
|
return 0;
|
|
|
|
memcpy(frag->fragment, s->internal->init_buf->data, s->internal->init_num);
|
|
|
|
if (is_ccs) {
|
|
OPENSSL_assert(D1I(s)->w_msg_hdr.msg_len +
|
|
((s->version == DTLS1_VERSION) ?
|
|
DTLS1_CCS_HEADER_LENGTH : 3) == (unsigned int)s->internal->init_num);
|
|
} else {
|
|
OPENSSL_assert(D1I(s)->w_msg_hdr.msg_len +
|
|
DTLS1_HM_HEADER_LENGTH == (unsigned int)s->internal->init_num);
|
|
}
|
|
|
|
frag->msg_header.msg_len = D1I(s)->w_msg_hdr.msg_len;
|
|
frag->msg_header.seq = D1I(s)->w_msg_hdr.seq;
|
|
frag->msg_header.type = D1I(s)->w_msg_hdr.type;
|
|
frag->msg_header.frag_off = 0;
|
|
frag->msg_header.frag_len = D1I(s)->w_msg_hdr.msg_len;
|
|
frag->msg_header.is_ccs = is_ccs;
|
|
|
|
/* save current state*/
|
|
frag->msg_header.saved_retransmit_state.enc_write_ctx = s->internal->enc_write_ctx;
|
|
frag->msg_header.saved_retransmit_state.write_hash = s->internal->write_hash;
|
|
frag->msg_header.saved_retransmit_state.session = s->session;
|
|
frag->msg_header.saved_retransmit_state.epoch = D1I(s)->w_epoch;
|
|
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char)(dtls1_get_queue_priority(
|
|
frag->msg_header.seq, frag->msg_header.is_ccs) >> 8);
|
|
seq64be[7] = (unsigned char)(dtls1_get_queue_priority(
|
|
frag->msg_header.seq, frag->msg_header.is_ccs));
|
|
|
|
item = pitem_new(seq64be, frag);
|
|
if (item == NULL) {
|
|
dtls1_hm_fragment_free(frag);
|
|
return 0;
|
|
}
|
|
|
|
pqueue_insert(s->d1->sent_messages, item);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
|
|
int *found)
|
|
{
|
|
int ret;
|
|
/* XDTLS: for now assuming that read/writes are blocking */
|
|
pitem *item;
|
|
hm_fragment *frag;
|
|
unsigned long header_length;
|
|
unsigned char seq64be[8];
|
|
struct dtls1_retransmit_state saved_state;
|
|
unsigned char save_write_sequence[8];
|
|
|
|
/*
|
|
OPENSSL_assert(s->internal->init_num == 0);
|
|
OPENSSL_assert(s->internal->init_off == 0);
|
|
*/
|
|
|
|
/* XDTLS: the requested message ought to be found, otherwise error */
|
|
memset(seq64be, 0, sizeof(seq64be));
|
|
seq64be[6] = (unsigned char)(seq >> 8);
|
|
seq64be[7] = (unsigned char)seq;
|
|
|
|
item = pqueue_find(s->d1->sent_messages, seq64be);
|
|
if (item == NULL) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "retransmit: message %d non-existent\n", seq);
|
|
#endif
|
|
*found = 0;
|
|
return 0;
|
|
}
|
|
|
|
*found = 1;
|
|
frag = (hm_fragment *)item->data;
|
|
|
|
if (frag->msg_header.is_ccs)
|
|
header_length = DTLS1_CCS_HEADER_LENGTH;
|
|
else
|
|
header_length = DTLS1_HM_HEADER_LENGTH;
|
|
|
|
memcpy(s->internal->init_buf->data, frag->fragment,
|
|
frag->msg_header.msg_len + header_length);
|
|
s->internal->init_num = frag->msg_header.msg_len + header_length;
|
|
|
|
dtls1_set_message_header_int(s, frag->msg_header.type,
|
|
frag->msg_header.msg_len, frag->msg_header.seq, 0,
|
|
frag->msg_header.frag_len);
|
|
|
|
/* save current state */
|
|
saved_state.enc_write_ctx = s->internal->enc_write_ctx;
|
|
saved_state.write_hash = s->internal->write_hash;
|
|
saved_state.session = s->session;
|
|
saved_state.epoch = D1I(s)->w_epoch;
|
|
|
|
D1I(s)->retransmitting = 1;
|
|
|
|
/* restore state in which the message was originally sent */
|
|
s->internal->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
|
|
s->internal->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
|
|
s->session = frag->msg_header.saved_retransmit_state.session;
|
|
D1I(s)->w_epoch = frag->msg_header.saved_retransmit_state.epoch;
|
|
|
|
if (frag->msg_header.saved_retransmit_state.epoch ==
|
|
saved_state.epoch - 1) {
|
|
memcpy(save_write_sequence, S3I(s)->write_sequence,
|
|
sizeof(S3I(s)->write_sequence));
|
|
memcpy(S3I(s)->write_sequence, D1I(s)->last_write_sequence,
|
|
sizeof(S3I(s)->write_sequence));
|
|
}
|
|
|
|
ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
|
|
SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
|
|
|
|
/* restore current state */
|
|
s->internal->enc_write_ctx = saved_state.enc_write_ctx;
|
|
s->internal->write_hash = saved_state.write_hash;
|
|
s->session = saved_state.session;
|
|
D1I(s)->w_epoch = saved_state.epoch;
|
|
|
|
if (frag->msg_header.saved_retransmit_state.epoch ==
|
|
saved_state.epoch - 1) {
|
|
memcpy(D1I(s)->last_write_sequence, S3I(s)->write_sequence,
|
|
sizeof(S3I(s)->write_sequence));
|
|
memcpy(S3I(s)->write_sequence, save_write_sequence,
|
|
sizeof(S3I(s)->write_sequence));
|
|
}
|
|
|
|
D1I(s)->retransmitting = 0;
|
|
|
|
(void)BIO_flush(SSL_get_wbio(s));
|
|
return ret;
|
|
}
|
|
|
|
/* call this function when the buffered messages are no longer needed */
|
|
void
|
|
dtls1_clear_record_buffer(SSL *s)
|
|
{
|
|
pitem *item;
|
|
|
|
for(item = pqueue_pop(s->d1->sent_messages); item != NULL;
|
|
item = pqueue_pop(s->d1->sent_messages)) {
|
|
dtls1_hm_fragment_free((hm_fragment *)item->data);
|
|
pitem_free(item);
|
|
}
|
|
}
|
|
|
|
void
|
|
dtls1_set_message_header(SSL *s, unsigned char mt, unsigned long len,
|
|
unsigned long frag_off, unsigned long frag_len)
|
|
{
|
|
/* Don't change sequence numbers while listening */
|
|
if (frag_off == 0 && !D1I(s)->listen) {
|
|
D1I(s)->handshake_write_seq = D1I(s)->next_handshake_write_seq;
|
|
D1I(s)->next_handshake_write_seq++;
|
|
}
|
|
|
|
dtls1_set_message_header_int(s, mt, len, D1I(s)->handshake_write_seq,
|
|
frag_off, frag_len);
|
|
}
|
|
|
|
/* don't actually do the writing, wait till the MTU has been retrieved */
|
|
void
|
|
dtls1_set_message_header_int(SSL *s, unsigned char mt, unsigned long len,
|
|
unsigned short seq_num, unsigned long frag_off, unsigned long frag_len)
|
|
{
|
|
struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
|
|
|
|
msg_hdr->type = mt;
|
|
msg_hdr->msg_len = len;
|
|
msg_hdr->seq = seq_num;
|
|
msg_hdr->frag_off = frag_off;
|
|
msg_hdr->frag_len = frag_len;
|
|
}
|
|
|
|
static void
|
|
dtls1_fix_message_header(SSL *s, unsigned long frag_off, unsigned long frag_len)
|
|
{
|
|
struct hm_header_st *msg_hdr = &D1I(s)->w_msg_hdr;
|
|
|
|
msg_hdr->frag_off = frag_off;
|
|
msg_hdr->frag_len = frag_len;
|
|
}
|
|
|
|
static int
|
|
dtls1_write_message_header(const struct hm_header_st *msg_hdr,
|
|
unsigned long frag_off, unsigned long frag_len, unsigned char *p)
|
|
{
|
|
CBB cbb;
|
|
|
|
/* We assume DTLS1_HM_HEADER_LENGTH bytes are available for now... */
|
|
if (!CBB_init_fixed(&cbb, p, DTLS1_HM_HEADER_LENGTH))
|
|
return 0;
|
|
if (!CBB_add_u8(&cbb, msg_hdr->type))
|
|
goto err;
|
|
if (!CBB_add_u24(&cbb, msg_hdr->msg_len))
|
|
goto err;
|
|
if (!CBB_add_u16(&cbb, msg_hdr->seq))
|
|
goto err;
|
|
if (!CBB_add_u24(&cbb, frag_off))
|
|
goto err;
|
|
if (!CBB_add_u24(&cbb, frag_len))
|
|
goto err;
|
|
if (!CBB_finish(&cbb, NULL, NULL))
|
|
goto err;
|
|
|
|
return 1;
|
|
|
|
err:
|
|
CBB_cleanup(&cbb);
|
|
return 0;
|
|
}
|
|
|
|
unsigned int
|
|
dtls1_min_mtu(void)
|
|
{
|
|
return (g_probable_mtu[(sizeof(g_probable_mtu) /
|
|
sizeof(g_probable_mtu[0])) - 1]);
|
|
}
|
|
|
|
static unsigned int
|
|
dtls1_guess_mtu(unsigned int curr_mtu)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (curr_mtu == 0)
|
|
return g_probable_mtu[0];
|
|
|
|
for (i = 0; i < sizeof(g_probable_mtu) / sizeof(g_probable_mtu[0]); i++)
|
|
if (curr_mtu > g_probable_mtu[i])
|
|
return g_probable_mtu[i];
|
|
|
|
return curr_mtu;
|
|
}
|
|
|
|
int
|
|
dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
|
|
{
|
|
CBS header;
|
|
uint32_t msg_len, frag_off, frag_len;
|
|
uint16_t seq;
|
|
uint8_t type;
|
|
|
|
CBS_init(&header, data, sizeof(*msg_hdr));
|
|
|
|
memset(msg_hdr, 0, sizeof(*msg_hdr));
|
|
|
|
if (!CBS_get_u8(&header, &type))
|
|
return 0;
|
|
if (!CBS_get_u24(&header, &msg_len))
|
|
return 0;
|
|
if (!CBS_get_u16(&header, &seq))
|
|
return 0;
|
|
if (!CBS_get_u24(&header, &frag_off))
|
|
return 0;
|
|
if (!CBS_get_u24(&header, &frag_len))
|
|
return 0;
|
|
|
|
msg_hdr->type = type;
|
|
msg_hdr->msg_len = msg_len;
|
|
msg_hdr->seq = seq;
|
|
msg_hdr->frag_off = frag_off;
|
|
msg_hdr->frag_len = frag_len;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
|
|
{
|
|
memset(ccs_hdr, 0, sizeof(struct ccs_header_st));
|
|
|
|
ccs_hdr->type = *(data++);
|
|
}
|