crypto/libressl/ssl/ssl_tlsext.h

   1 /* $OpenBSD: ssl_tlsext.h,v 1.32 2022/08/04 09:27:36 tb 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
  34 int tlsext_alpn_check_format(CBS *cbs);
  35 int tlsext_sni_is_valid_hostname(CBS *cbs, int *is_ip);
  36
  37 int tlsext_client_build(SSL *s, uint16_t msg_type, CBB *cbb);
  38 int tlsext_client_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert);
  39
  40 int tlsext_server_build(SSL *s, uint16_t msg_type, CBB *cbb);
  41 int tlsext_server_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert);
  42
  43 int tlsext_extension_seen(SSL *s, uint16_t);
  44
  45 __END_HIDDEN_DECLS
  46
  47 #endif