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02f0274e8c
Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich Salz Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org>
873 lines
27 KiB
C
873 lines
27 KiB
C
/*
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* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdlib.h>
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#include "../ssl_locl.h"
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#include "statem_locl.h"
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static int tls_ext_final_renegotiate(SSL *s, unsigned int context, int sent,
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int *al);
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static int tls_ext_init_server_name(SSL *s, unsigned int context);
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static int tls_ext_final_server_name(SSL *s, unsigned int context, int sent,
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int *al);
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static int tls_ext_init_status_request(SSL *s, unsigned int context);
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#ifndef OPENSSL_NO_NEXTPROTONEG
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static int tls_ext_init_npn(SSL *s, unsigned int context);
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#endif
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static int tls_ext_init_alpn(SSL *s, unsigned int context);
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static int tls_ext_final_alpn(SSL *s, unsigned int context, int sent, int *al);
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static int tls_ext_init_sig_algs(SSL *s, unsigned int context);
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#ifndef OPENSSL_NO_SRP
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static int tls_ext_init_srp(SSL *s, unsigned int context);
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#endif
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static int tls_ext_init_etm(SSL *s, unsigned int context);
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#ifndef OPENSSL_NO_SRTP
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static int tls_ext_init_srtp(SSL *s, unsigned int context);
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#endif
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typedef struct {
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/* The ID for the extension */
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unsigned int type;
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/*
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* Initialise extension before parsing. Always called for relevant contexts
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* even if extension not present
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*/
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int (*init_ext)(SSL *s, unsigned int context);
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/* Parse extension received by server from client */
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int (*parse_client_ext)(SSL *s, PACKET *pkt, int *al);
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/* Parse extension received by client from server */
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int (*parse_server_ext)(SSL *s, PACKET *pkt, int *al);
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/* Construct extension sent by server */
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int (*construct_server_ext)(SSL *s, WPACKET *pkt, int *al);
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/* Construct extension sent by client */
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int (*construct_client_ext)(SSL *s, WPACKET *pkt, int *al);
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/*
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* Finalise extension after parsing. Always called where an extensions was
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* initialised even if the extension was not present. |sent| is set to 1 if
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* the extension was seen, or 0 otherwise.
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*/
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int (*finalise_ext)(SSL *s, unsigned int context, int sent, int *al);
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unsigned int context;
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} EXTENSION_DEFINITION;
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/*
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* TODO(TLS1.3): Temporarily modified the definitions below to put all TLS1.3
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* extensions in the ServerHello for now. That needs to be put back to correct
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* setting once encrypted extensions is working properly.
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*/
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static const EXTENSION_DEFINITION ext_defs[] = {
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{
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TLSEXT_TYPE_renegotiate,
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NULL,
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tls_parse_client_renegotiate,
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tls_parse_server_renegotiate,
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tls_construct_server_renegotiate,
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tls_construct_client_renegotiate,
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tls_ext_final_renegotiate,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_SSL3_ALLOWED
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| EXT_TLS1_2_AND_BELOW_ONLY
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},
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{
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TLSEXT_TYPE_server_name,
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tls_ext_init_server_name,
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tls_parse_client_server_name,
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tls_parse_server_server_name,
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tls_construct_server_server_name,
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tls_construct_client_server_name,
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tls_ext_final_server_name,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
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| EXT_TLS1_3_ENCRYPTED_EXTENSIONS
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},
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#ifndef OPENSSL_NO_SRP
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{
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TLSEXT_TYPE_srp,
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tls_ext_init_srp,
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tls_parse_client_srp,
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NULL,
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NULL,
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tls_construct_client_srp,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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#endif
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#ifndef OPENSSL_NO_EC
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{
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TLSEXT_TYPE_ec_point_formats,
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NULL,
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tls_parse_client_ec_pt_formats,
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tls_parse_server_ec_pt_formats,
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tls_construct_server_ec_pt_formats,
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tls_construct_client_ec_pt_formats,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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{
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TLSEXT_TYPE_supported_groups,
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NULL,
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tls_parse_client_supported_groups,
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NULL,
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NULL /* TODO(TLS1.3): Need to add this */,
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tls_construct_client_supported_groups,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_3_ENCRYPTED_EXTENSIONS
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},
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#endif
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{
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TLSEXT_TYPE_session_ticket,
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NULL,
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tls_parse_client_session_ticket,
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tls_parse_server_session_ticket,
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tls_construct_server_session_ticket,
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tls_construct_client_session_ticket,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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{
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TLSEXT_TYPE_signature_algorithms,
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tls_ext_init_sig_algs,
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tls_parse_client_sig_algs,
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NULL,
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NULL,
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tls_construct_client_sig_algs,
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NULL,
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EXT_CLIENT_HELLO
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},
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#ifndef OPENSSL_NO_OCSP
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{
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TLSEXT_TYPE_status_request,
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tls_ext_init_status_request,
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tls_parse_client_status_request,
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tls_parse_server_status_request,
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tls_construct_server_status_request,
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tls_construct_client_status_request,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
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| EXT_TLS1_3_CERTIFICATE
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},
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#endif
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#ifndef OPENSSL_NO_NEXTPROTONEG
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{
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TLSEXT_TYPE_next_proto_neg,
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tls_ext_init_npn,
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tls_parse_client_npn,
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tls_parse_server_npn,
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tls_construct_server_next_proto_neg,
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tls_construct_client_npn,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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#endif
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{
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/*
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* Must appear in this list after server_name so that finalisation
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* happens after server_name callbacks
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*/
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TLSEXT_TYPE_application_layer_protocol_negotiation,
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tls_ext_init_alpn,
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tls_parse_client_alpn,
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tls_parse_server_alpn,
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tls_construct_server_alpn,
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tls_construct_client_alpn,
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tls_ext_final_alpn,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
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| EXT_TLS1_3_ENCRYPTED_EXTENSIONS
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},
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#ifndef OPENSSL_NO_SRTP
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{
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TLSEXT_TYPE_use_srtp,
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tls_ext_init_srtp,
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tls_parse_client_use_srtp,
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tls_parse_server_use_srtp,
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tls_construct_server_use_srtp,
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tls_construct_client_use_srtp,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
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| EXT_TLS1_3_ENCRYPTED_EXTENSIONS | EXT_DTLS_ONLY
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},
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#endif
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{
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TLSEXT_TYPE_encrypt_then_mac,
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tls_ext_init_etm,
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tls_parse_client_etm,
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tls_parse_server_etm,
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tls_construct_server_etm,
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tls_construct_client_etm,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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#ifndef OPENSSL_NO_CT
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{
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TLSEXT_TYPE_signed_certificate_timestamp,
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NULL,
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/*
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* No server side support for this, but can be provided by a custom
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* extension. This is an exception to the rule that custom extensions
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* cannot override built in ones.
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*/
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NULL,
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tls_parse_server_sct,
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NULL,
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tls_construct_client_sct,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
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| EXT_TLS1_3_CERTIFICATE
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},
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#endif
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{
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TLSEXT_TYPE_extended_master_secret,
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NULL,
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tls_parse_client_ems,
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tls_parse_server_ems,
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tls_construct_server_ems,
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tls_construct_client_ems,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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{
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TLSEXT_TYPE_supported_versions,
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NULL,
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/* Processed inline as part of version selection */
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NULL,
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NULL,
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NULL,
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tls_construct_client_supported_versions,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS_IMPLEMENTATION_ONLY | EXT_TLS1_3_ONLY
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},
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{
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TLSEXT_TYPE_key_share,
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NULL,
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tls_parse_client_key_share,
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tls_parse_server_key_share,
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tls_construct_server_key_share,
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tls_construct_client_key_share,
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NULL,
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EXT_CLIENT_HELLO | EXT_TLS1_3_SERVER_HELLO
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| EXT_TLS1_3_HELLO_RETRY_REQUEST | EXT_TLS_IMPLEMENTATION_ONLY
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| EXT_TLS1_3_ONLY
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},
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{
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/*
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* Special unsolicited ServerHello extension only used when
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* SSL_OP_CRYPTOPRO_TLSEXT_BUG is set
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*/
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TLSEXT_TYPE_cryptopro_bug,
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NULL,
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NULL,
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NULL,
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tls_construct_server_cryptopro_bug,
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NULL,
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NULL,
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EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
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},
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{
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/* Last in the list because it must be added as the last extension */
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TLSEXT_TYPE_padding,
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NULL,
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/* We send this, but don't read it */
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NULL,
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NULL,
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NULL,
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tls_construct_client_padding,
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NULL,
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EXT_CLIENT_HELLO
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}
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};
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/*
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* Comparison function used in a call to qsort (see tls_collect_extensions()
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* below.)
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* The two arguments |p1| and |p2| are expected to be pointers to RAW_EXTENSIONs
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*
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* Returns:
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* 1 if the type for p1 is greater than p2
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* 0 if the type for p1 and p2 are the same
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* -1 if the type for p1 is less than p2
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*/
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static int compare_extensions(const void *p1, const void *p2)
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{
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const RAW_EXTENSION *e1 = (const RAW_EXTENSION *)p1;
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const RAW_EXTENSION *e2 = (const RAW_EXTENSION *)p2;
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if (e1->type < e2->type)
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return -1;
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else if (e1->type > e2->type)
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return 1;
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return 0;
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}
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/*
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* Verify whether we are allowed to use the extension |type| in the current
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* |context|. Returns 1 to indicate the extension is allowed or unknown or 0 to
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* indicate the extension is not allowed.
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*/
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static int verify_extension(SSL *s, unsigned int context, unsigned int type)
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{
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size_t i;
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for (i = 0; i < OSSL_NELEM(ext_defs); i++) {
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if (type == ext_defs[i].type) {
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/* Check we're allowed to use this extension in this context */
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if ((context & ext_defs[i].context) == 0)
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return 0;
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if (SSL_IS_DTLS(s)) {
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if ((ext_defs[i].context & EXT_TLS_ONLY) != 0)
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return 0;
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} else if ((ext_defs[i].context & EXT_DTLS_ONLY) != 0) {
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return 0;
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}
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return 1;
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}
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}
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/* Unknown extension. We allow it */
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return 1;
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}
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/*
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* Finds an extension definition for the give extension |type|.
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* Returns 1 if found and stores the definition in |*def|, or returns 0
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* otherwise.
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*/
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static int find_extension_definition(SSL *s, unsigned int type,
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const EXTENSION_DEFINITION **def)
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{
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size_t i;
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for (i = 0; i < OSSL_NELEM(ext_defs); i++) {
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if (type == ext_defs[i].type) {
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*def = &ext_defs[i];
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return 1;
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}
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}
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/* Unknown extension */
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return 0;
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}
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static int extension_is_relevant(SSL *s, unsigned int extctx,
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unsigned int thisctx)
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{
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if ((SSL_IS_DTLS(s)
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&& (extctx & EXT_TLS_IMPLEMENTATION_ONLY) != 0)
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|| (s->version == SSL3_VERSION
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&& (extctx & EXT_SSL3_ALLOWED) == 0)
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|| (SSL_IS_TLS13(s)
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&& (extctx & EXT_TLS1_2_AND_BELOW_ONLY) != 0)
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|| (!SSL_IS_TLS13(s) && (extctx & EXT_TLS1_3_ONLY) != 0))
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return 0;
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return 1;
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}
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/*
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* Gather a list of all the extensions from the data in |packet]. |context|
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* tells us which message this extension is for. Ttls_parse_server_ec_pt_formatshe raw extension data is
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* stored in |*res| with the number of found extensions in |*numfound|. In the
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* event of an error the alert type to use is stored in |*ad|. We don't actually
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* process the content of the extensions yet, except to check their types.
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*
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* Per http://tools.ietf.org/html/rfc5246#section-7.4.1.4, there may not be
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* more than one extension of the same type in a ClientHello or ServerHello.
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* This function returns 1 if all extensions are unique and we have parsed their
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* types, and 0 if the extensions contain duplicates, could not be successfully
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* parsed, or an internal error occurred.
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*/
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int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
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RAW_EXTENSION **res, size_t *numfound, int *ad)
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{
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PACKET extensions = *packet;
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size_t num_extensions = 0, i = 0;
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RAW_EXTENSION *raw_extensions = NULL;
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/* First pass: count the extensions. */
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while (PACKET_remaining(&extensions) > 0) {
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unsigned int type;
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PACKET extension;
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if (!PACKET_get_net_2(&extensions, &type) ||
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!PACKET_get_length_prefixed_2(&extensions, &extension)) {
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SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
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*ad = SSL_AD_DECODE_ERROR;
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goto err;
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}
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/* Verify this extension is allowed */
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if (!verify_extension(s, context, type)) {
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SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_BAD_EXTENSION);
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*ad = SSL_AD_ILLEGAL_PARAMETER;
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goto err;
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}
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num_extensions++;
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}
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if (num_extensions > 0) {
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raw_extensions = OPENSSL_zalloc(sizeof(*raw_extensions)
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* num_extensions);
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if (raw_extensions == NULL) {
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*ad = SSL_AD_INTERNAL_ERROR;
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SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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/* Second pass: collect the extensions. */
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for (i = 0; i < num_extensions; i++) {
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if (!PACKET_get_net_2(packet, &raw_extensions[i].type) ||
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!PACKET_get_length_prefixed_2(packet,
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&raw_extensions[i].data)) {
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/* This should not happen. */
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*ad = SSL_AD_INTERNAL_ERROR;
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SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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}
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if (PACKET_remaining(packet) != 0) {
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*ad = SSL_AD_DECODE_ERROR;
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SSLerr(SSL_F_TLS_COLLECT_EXTENSIONS, SSL_R_LENGTH_MISMATCH);
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goto err;
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}
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/* Sort the extensions and make sure there are no duplicates. */
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qsort(raw_extensions, num_extensions, sizeof(*raw_extensions),
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compare_extensions);
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for (i = 1; i < num_extensions; i++) {
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if (raw_extensions[i - 1].type == raw_extensions[i].type) {
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*ad = SSL_AD_DECODE_ERROR;
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goto err;
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}
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}
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}
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/*
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* Initialise all known extensions relevant to this context, whether we have
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* found them or not
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*/
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for (i = 0; i < OSSL_NELEM(ext_defs); i++) {
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if(ext_defs[i].init_ext != NULL && (ext_defs[i].context & context) != 0
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&& extension_is_relevant(s, ext_defs[i].context, context)
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&& !ext_defs[i].init_ext(s, context)) {
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*ad = SSL_AD_INTERNAL_ERROR;
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goto err;
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}
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}
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/*
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* Initialise server side custom extensions. Client side is done during
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* construction of extensions for the ClientHello.
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*/
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if ((context & (EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_3_SERVER_HELLO)) != 0)
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custom_ext_init(&s->cert->srv_ext);
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*res = raw_extensions;
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*numfound = num_extensions;
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return 1;
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err:
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OPENSSL_free(raw_extensions);
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return 0;
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}
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/*
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* Runs the parsers for all of the extensions in the given list |exts|, which
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* should have |numexts| extensions in it. The parsers are only run if they are
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* applicable for the given |context| and the parser has not already been run
|
|
* for that extension. Returns 1 on success or 0 on failure. In the event of a
|
|
* failure |*al| is populated with a suitable alert code.
|
|
*/
|
|
static int tls_parse_extension_list(SSL *s, int context, RAW_EXTENSION *exts,
|
|
size_t numexts, int *al)
|
|
{
|
|
size_t loop;
|
|
|
|
for (loop = 0; loop < numexts; loop++) {
|
|
RAW_EXTENSION *currext = &exts[loop];
|
|
const EXTENSION_DEFINITION *extdef = NULL;
|
|
int (*parser)(SSL *s, PACKET *pkt, int *al) = NULL;
|
|
|
|
if (s->tlsext_debug_cb)
|
|
s->tlsext_debug_cb(s, !s->server, currext->type,
|
|
PACKET_data(&currext->data),
|
|
PACKET_remaining(&currext->data),
|
|
s->tlsext_debug_arg);
|
|
|
|
/* Skip if we've already parsed this extension */
|
|
if (currext->parsed)
|
|
continue;
|
|
|
|
currext->parsed = 1;
|
|
|
|
parser = NULL;
|
|
if (find_extension_definition(s, currext->type, &extdef)) {
|
|
parser = s->server ? extdef->parse_client_ext
|
|
: extdef->parse_server_ext;
|
|
|
|
/* Check if extension is defined for our protocol. If not, skip */
|
|
if (!extension_is_relevant(s, extdef->context, context))
|
|
continue;
|
|
}
|
|
|
|
if (parser == NULL) {
|
|
/*
|
|
* Could be a custom extension. We only allow this if it is a non
|
|
* resumed session on the server side.
|
|
*
|
|
* TODO(TLS1.3): We only allow old style <=TLS1.2 custom extensions.
|
|
* We're going to need a new mechanism for TLS1.3 to specify which
|
|
* messages to add the custom extensions to.
|
|
*/
|
|
if ((!s->hit || !s->server)
|
|
&& (context
|
|
& (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0
|
|
&& custom_ext_parse(s, s->server, currext->type,
|
|
PACKET_data(&currext->data),
|
|
PACKET_remaining(&currext->data),
|
|
al) <= 0)
|
|
return 0;
|
|
|
|
continue;
|
|
}
|
|
|
|
if (!parser(s, &currext->data, al))
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Parse all remaining extensions that have not yet been parsed. Also calls the
|
|
* finalisation for all extensions at the end. The given extensions must be in
|
|
* order of type (which happens by default during collection). Returns 1 for
|
|
* success or 0 for failure. On failure, |*al| is populated with a suitable
|
|
* alert code.
|
|
*/
|
|
int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
|
|
size_t numexts, int *al)
|
|
{
|
|
size_t loop;
|
|
|
|
if (!tls_parse_extension_list(s, context, exts, numexts, al))
|
|
return 0;
|
|
|
|
/*
|
|
* Finalise all known extensions relevant to this context, whether we have
|
|
* found them or not
|
|
*/
|
|
for (loop = 0; loop < OSSL_NELEM(ext_defs); loop++) {
|
|
if(ext_defs[loop].finalise_ext != NULL
|
|
&& (ext_defs[loop].context & context) != 0) {
|
|
size_t curr;
|
|
|
|
/*
|
|
* Work out whether this extension was sent or not. The sent
|
|
* extensions in |exts| are sorted by order of type
|
|
*/
|
|
for (curr = 0; curr < numexts
|
|
&& exts[curr].type < ext_defs[loop].type; curr++)
|
|
continue;
|
|
|
|
if (!ext_defs[loop].finalise_ext(s, context,
|
|
(curr < numexts && exts[curr].type == ext_defs[loop].type),
|
|
al))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Find a specific extension by |type| in the list |exts| containing |numexts|
|
|
* extensions, and the parse it immediately. Returns 1 on success, or 0 on
|
|
* failure. If a failure has occurred then |*al| will also be set to the alert
|
|
* to be sent.
|
|
*/
|
|
int tls_parse_extension(SSL *s, int type, int context, RAW_EXTENSION *exts,
|
|
size_t numexts, int *al)
|
|
{
|
|
RAW_EXTENSION *ext = tls_get_extension_by_type(exts, numexts, type);
|
|
|
|
if (ext == NULL)
|
|
return 1;
|
|
|
|
return tls_parse_extension_list(s, context, ext, 1, al);
|
|
}
|
|
|
|
int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
|
|
int *al)
|
|
{
|
|
size_t loop;
|
|
int addcustom = 0;
|
|
int min_version, max_version = 0, reason;
|
|
|
|
/*
|
|
* Normally if something goes wrong during construction its an internal
|
|
* error. We can always override this later.
|
|
*/
|
|
*al = SSL_AD_INTERNAL_ERROR;
|
|
|
|
if (!WPACKET_start_sub_packet_u16(pkt)
|
|
/*
|
|
* If extensions are of zero length then we don't even add the
|
|
* extensions length bytes to a ClientHello/ServerHello in SSLv3
|
|
*/
|
|
|| ((context & (EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO)) != 0
|
|
&& s->version == SSL3_VERSION
|
|
&& !WPACKET_set_flags(pkt,
|
|
WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
|
|
SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
if ((context & EXT_CLIENT_HELLO) != 0) {
|
|
reason = ssl_get_client_min_max_version(s, &min_version, &max_version);
|
|
if (reason != 0) {
|
|
SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Add custom extensions first */
|
|
if ((context & EXT_CLIENT_HELLO) != 0) {
|
|
custom_ext_init(&s->cert->cli_ext);
|
|
addcustom = 1;
|
|
} else if ((context & EXT_TLS1_2_SERVER_HELLO) != 0) {
|
|
/*
|
|
* We already initialised the custom extensions during ClientHello
|
|
* parsing.
|
|
*
|
|
* TODO(TLS1.3): We're going to need a new custom extension mechanism
|
|
* for TLS1.3, so that custom extensions can specify which of the
|
|
* multiple message they wish to add themselves to.
|
|
*/
|
|
addcustom = 1;
|
|
}
|
|
|
|
if (addcustom && !custom_ext_add(s, s->server, pkt, al)) {
|
|
SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
for (loop = 0; loop < OSSL_NELEM(ext_defs); loop++) {
|
|
int (*construct)(SSL *s, WPACKET *pkt, int *al);
|
|
|
|
/* Skip if not relevant for our context */
|
|
if ((ext_defs[loop].context & context) == 0)
|
|
continue;
|
|
|
|
construct = s->server ? ext_defs[loop].construct_server_ext
|
|
: ext_defs[loop].construct_client_ext;
|
|
|
|
/* Check if this extension is defined for our protocol. If not, skip */
|
|
if ((SSL_IS_DTLS(s)
|
|
&& (ext_defs[loop].context & EXT_TLS_IMPLEMENTATION_ONLY)
|
|
!= 0)
|
|
|| (s->version == SSL3_VERSION
|
|
&& (ext_defs[loop].context & EXT_SSL3_ALLOWED) == 0)
|
|
|| (SSL_IS_TLS13(s)
|
|
&& (ext_defs[loop].context & EXT_TLS1_2_AND_BELOW_ONLY)
|
|
!= 0)
|
|
|| (!SSL_IS_TLS13(s)
|
|
&& (ext_defs[loop].context & EXT_TLS1_3_ONLY) != 0
|
|
&& (context & EXT_CLIENT_HELLO) == 0)
|
|
|| ((ext_defs[loop].context & EXT_TLS1_3_ONLY) != 0
|
|
&& (context & EXT_CLIENT_HELLO) != 0
|
|
&& (SSL_IS_DTLS(s) || max_version < TLS1_3_VERSION))
|
|
|| construct == NULL)
|
|
continue;
|
|
|
|
if (!construct(s, pkt, al))
|
|
return 0;
|
|
}
|
|
|
|
if (!WPACKET_close(pkt)) {
|
|
SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int tls_ext_final_renegotiate(SSL *s, unsigned int context, int sent,
|
|
int *al)
|
|
{
|
|
if (!s->server)
|
|
return 1;
|
|
|
|
/* Need RI if renegotiating */
|
|
if (s->renegotiate
|
|
&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
|
|
&& !sent) {
|
|
*al = SSL_AD_HANDSHAKE_FAILURE;
|
|
SSLerr(SSL_F_TLS_EXT_FINAL_RENEGOTIATE,
|
|
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int tls_ext_init_server_name(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server)
|
|
s->servername_done = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Call the servername callback. Returns 1 for success or 0 for failure. */
|
|
static int tls_ext_final_server_name(SSL *s, unsigned int context, int sent,
|
|
int *al)
|
|
{
|
|
int ret = SSL_TLSEXT_ERR_NOACK;
|
|
int altmp = SSL_AD_UNRECOGNIZED_NAME;
|
|
|
|
if (!s->server)
|
|
return 1;
|
|
|
|
if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
|
|
ret = s->ctx->tlsext_servername_callback(s, &altmp,
|
|
s->ctx->tlsext_servername_arg);
|
|
else if (s->initial_ctx != NULL
|
|
&& s->initial_ctx->tlsext_servername_callback != 0)
|
|
ret = s->initial_ctx->tlsext_servername_callback(s, &altmp,
|
|
s->initial_ctx->tlsext_servername_arg);
|
|
|
|
switch (ret) {
|
|
case SSL_TLSEXT_ERR_ALERT_FATAL:
|
|
*al = altmp;
|
|
return 0;
|
|
|
|
case SSL_TLSEXT_ERR_ALERT_WARNING:
|
|
*al = altmp;
|
|
return 1;
|
|
|
|
case SSL_TLSEXT_ERR_NOACK:
|
|
s->servername_done = 0;
|
|
return 1;
|
|
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int tls_ext_init_status_request(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server)
|
|
s->tlsext_status_type = -1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_NEXTPROTONEG
|
|
static int tls_ext_init_npn(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server)
|
|
s->s3->next_proto_neg_seen = 0;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static int tls_ext_init_alpn(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server) {
|
|
OPENSSL_free(s->s3->alpn_selected);
|
|
s->s3->alpn_selected = NULL;
|
|
s->s3->alpn_selected_len = 0;
|
|
OPENSSL_free(s->s3->alpn_proposed);
|
|
s->s3->alpn_proposed = NULL;
|
|
s->s3->alpn_proposed_len = 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Process the ALPN extension in a ClientHello.
|
|
* al: a pointer to the alert value to send in the event of a failure.
|
|
* returns 1 on success, 0 on error.
|
|
*/
|
|
static int tls_ext_final_alpn(SSL *s, unsigned int context, int sent, int *al)
|
|
{
|
|
const unsigned char *selected = NULL;
|
|
unsigned char selected_len = 0;
|
|
|
|
if (!s->server)
|
|
return 1;
|
|
|
|
if (s->ctx->alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) {
|
|
int r = s->ctx->alpn_select_cb(s, &selected, &selected_len,
|
|
s->s3->alpn_proposed,
|
|
(unsigned int)s->s3->alpn_proposed_len,
|
|
s->ctx->alpn_select_cb_arg);
|
|
|
|
if (r == SSL_TLSEXT_ERR_OK) {
|
|
OPENSSL_free(s->s3->alpn_selected);
|
|
s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len);
|
|
if (s->s3->alpn_selected == NULL) {
|
|
*al = SSL_AD_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
s->s3->alpn_selected_len = selected_len;
|
|
#ifndef OPENSSL_NO_NEXTPROTONEG
|
|
/* ALPN takes precedence over NPN. */
|
|
s->s3->next_proto_neg_seen = 0;
|
|
#endif
|
|
} else {
|
|
*al = SSL_AD_NO_APPLICATION_PROTOCOL;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int tls_ext_init_sig_algs(SSL *s, unsigned int context)
|
|
{
|
|
/* Clear any signature algorithms extension received */
|
|
OPENSSL_free(s->s3->tmp.peer_sigalgs);
|
|
s->s3->tmp.peer_sigalgs = NULL;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_SRP
|
|
static int tls_ext_init_srp(SSL *s, unsigned int context)
|
|
{
|
|
OPENSSL_free(s->srp_ctx.login);
|
|
s->srp_ctx.login = NULL;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static int tls_ext_init_etm(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server)
|
|
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_SRTP
|
|
static int tls_ext_init_srtp(SSL *s, unsigned int context)
|
|
{
|
|
if (s->server)
|
|
s->srtp_profile = NULL;
|
|
|
|
return 1;
|
|
}
|
|
#endif
|