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view src/event/quic/ngx_event_quic_tokens.h @ 9170:c80d111340dc

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QUIC: prevented generating ACK frames with discarded keys. Previously it was possible to generate ACK frames using formally discarded protection keys, in particular, when acknowledging a client Handshake packet used to complete the TLS handshake and to discard handshake protection keys. As it happens late in packet processing, it could be possible to generate ACK frames after the keys were already discarded. ACK frames are generated from ngx_quic_ack_packet(), either using a posted push event, which envolves ngx_quic_generate_ack() as a part of the final packet assembling, or directly in ngx_quic_ack_packet(), such as when there is no room to add a new ACK range or when the received packet is out of order. The added keys availability check is used to avoid generating late ACK frames in both cases.
author Sergey Kandaurov <pluknet@nginx.com>
date Fri, 20 Oct 2023 18:05:07 +0400
parents 77c1418916f7
children
line wrap: on
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/*
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_QUIC_TOKENS_H_INCLUDED_
#define _NGX_EVENT_QUIC_TOKENS_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#define NGX_QUIC_MAX_TOKEN_SIZE              64
    /* SHA-1(addr)=20 + sizeof(time_t) + retry(1) + odcid.len(1) + odcid */

#define NGX_QUIC_AES_256_GCM_IV_LEN          12
#define NGX_QUIC_AES_256_GCM_TAG_LEN         16

#define NGX_QUIC_TOKEN_BUF_SIZE             (NGX_QUIC_AES_256_GCM_IV_LEN      \
                                             + NGX_QUIC_MAX_TOKEN_SIZE        \
                                             + NGX_QUIC_AES_256_GCM_TAG_LEN)


ngx_int_t ngx_quic_new_sr_token(ngx_connection_t *c, ngx_str_t *cid,
    u_char *secret, u_char *token);
ngx_int_t ngx_quic_new_token(ngx_log_t *log, struct sockaddr *sockaddr,
    socklen_t socklen, u_char *key, ngx_str_t *token, ngx_str_t *odcid,
    time_t expires, ngx_uint_t is_retry);
ngx_int_t ngx_quic_validate_token(ngx_connection_t *c,
    u_char *key, ngx_quic_header_t *pkt);

#endif /* _NGX_EVENT_QUIC_TOKENS_H_INCLUDED_ */