59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#pragma once
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#include <s2n.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file npn.h
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*
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* The Next Protocol Negotiation Extension, or NPN, was an RFC proposal to
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* negotiate an application protocol. This proposal was never standardized, and
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* it was eventually replaced with the ALPN Extension. However, an early draft
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* version of the NPN Extension was implemented in Openssl.
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* Now, OpenSSL clients and servers may require this extension in order to connect.
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*
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* s2n-tls supports NPN to make it easier for users whose peers require this
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* extension, but s2n-tls does NOT recommend its use. The specific draft version
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* supported is https://datatracker.ietf.org/doc/html/draft-agl-tls-nextprotoneg-03,
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* which provides interoperability with OpenSSL.
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*/
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/**
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* Turns on support for the NPN extension.
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*
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* This will allow an s2n-tls client to send the NPN extension and an s2n-tls
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* server to respond to receiving the NPN extension. However, if their peer
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* also indicates support for the ALPN extension, s2n-tls will prefer that.
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*
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* Use s2n_config_append_protocol_preference() to set up a list of supported protocols.
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* After the negotiation for the connection has completed, the agreed-upon protocol
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* can be retrieved with s2n_get_application_protocol().
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*
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* @param config A pointer to the config object
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* @param enable Set to true to enable. Set to false to disable.
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* @returns S2N_SUCCESS on success, S2N_FAILURE on error.
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*/
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S2N_API int s2n_config_set_npn(struct s2n_config *config, bool enable);
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#ifdef __cplusplus
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}
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#endif
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