/* DTLS implementation written by Nagendra Modadugu * ([email protected]) for the OpenSSL project 2005. */ /* ==================================================================== * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * [email protected]. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * ([email protected]). This product includes software written by Tim * Hudson ([email protected]). * */ /* Copyright (C) 1995-1998 Eric Young ([email protected]) * All rights reserved. * * This package is an SSL implementation written * by Eric Young ([email protected]). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson ([email protected]). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young ([email protected])" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson ([email protected])" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <openssl/ssl.h> #include <assert.h> #include <string.h> #include <openssl/bytestring.h> #include <openssl/err.h> #include "internal.h" #include "../crypto/internal.h" BSSL_NAMESPACE_BEGIN // dtls1_bitmap_should_discard returns one if |seq_num| has been seen in // |bitmap| or is stale. Otherwise it returns zero. static bool dtls1_bitmap_should_discard(DTLS1_BITMAP *bitmap, uint64_t seq_num) { … } // dtls1_bitmap_record updates |bitmap| to record receipt of sequence number // |seq_num|. It slides the window forward if needed. It is an error to call // this function on a stale sequence number. static void dtls1_bitmap_record(DTLS1_BITMAP *bitmap, uint64_t seq_num) { … } // reconstruct_epoch finds the largest epoch that ends with the epoch bits from // |wire_epoch| that is less than or equal to |current_epoch|, to match the // epoch reconstruction algorithm described in RFC 9147 section 4.2.2. static uint16_t reconstruct_epoch(uint8_t wire_epoch, uint16_t current_epoch) { … } uint64_t reconstruct_seqnum(uint16_t wire_seq, uint64_t seq_mask, uint64_t max_valid_seqnum) { … } static bool parse_dtls13_record_header(SSL *ssl, CBS *in, size_t packet_size, uint8_t type, CBS *out_body, uint64_t *out_sequence, uint16_t *out_epoch, size_t *out_header_len) { … } static bool parse_dtls_plaintext_record_header( SSL *ssl, CBS *in, size_t packet_size, uint8_t type, CBS *out_body, uint64_t *out_sequence, uint16_t *out_epoch, size_t *out_header_len, uint16_t *out_version) { … } enum ssl_open_record_t dtls_open_record(SSL *ssl, uint8_t *out_type, Span<uint8_t> *out, size_t *out_consumed, uint8_t *out_alert, Span<uint8_t> in) { … } static SSLAEADContext *get_write_aead(const SSL *ssl, uint16_t epoch) { … } static bool use_dtls13_record_header(const SSL *ssl, uint16_t epoch) { … } size_t dtls_record_header_write_len(const SSL *ssl, uint16_t epoch) { … } size_t dtls_max_seal_overhead(const SSL *ssl, uint16_t epoch) { … } size_t dtls_seal_prefix_len(const SSL *ssl, uint16_t epoch) { … } bool dtls_seal_record(SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out, uint8_t type, const uint8_t *in, size_t in_len, uint16_t epoch) { … } BSSL_NAMESPACE_END
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