1/* $OpenBSD: ssl_tlsext.h,v 1.34 2024/03/26 03:44:11 beck Exp $ */ 2/* 3 * Copyright (c) 2016, 2017 Joel Sing <jsing@openbsd.org> 4 * Copyright (c) 2017 Doug Hogan <doug@openbsd.org> 5 * Copyright (c) 2019 Bob Beck <beck@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#ifndef HEADER_SSL_TLSEXT_H 21#define HEADER_SSL_TLSEXT_H 22 23/* TLSv1.3 - RFC 8446 Section 4.2. */ 24#define SSL_TLSEXT_MSG_CH 0x0001 /* ClientHello */ 25#define SSL_TLSEXT_MSG_SH 0x0002 /* ServerHello */ 26#define SSL_TLSEXT_MSG_EE 0x0004 /* EncryptedExtension */ 27#define SSL_TLSEXT_MSG_CT 0x0008 /* Certificate */ 28#define SSL_TLSEXT_MSG_CR 0x0010 /* CertificateRequest */ 29#define SSL_TLSEXT_MSG_NST 0x0020 /* NewSessionTicket */ 30#define SSL_TLSEXT_MSG_HRR 0x0040 /* HelloRetryRequest */ 31 32__BEGIN_HIDDEN_DECLS 33 34int tlsext_alpn_check_format(CBS *cbs); 35int tlsext_sni_is_valid_hostname(CBS *cbs, int *is_ip); 36 37int tlsext_client_build(SSL *s, uint16_t msg_type, CBB *cbb); 38int tlsext_client_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert); 39 40int tlsext_server_build(SSL *s, uint16_t msg_type, CBB *cbb); 41int tlsext_server_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert); 42 43int tlsext_extension_seen(SSL *s, uint16_t); 44int tlsext_extension_processed(SSL *s, uint16_t); 45int tlsext_randomize_build_order(SSL *s); 46 47__END_HIDDEN_DECLS 48 49#endif 50