Mercurial > hg > nginx
view src/mail/ngx_mail_realip_module.c @ 9153:8f7e6d8c061e
QUIC: use last client dcid to receive initial packets.
Previously, original dcid was used to receive initial client packets in case
server initial response was lost. However, last dcid should be used instead.
These two are the same unless retry is used. In case of retry, client resends
initial packet with a new dcid, that is different from the original dcid. If
server response is lost, the client resends this packet again with the same
dcid. This is shown in RFC 9000, 7.3. Authenticating Connection IDs, Figure 8.
The issue manifested itself with creating multiple server sessions in response
to each post-retry client initial packet, if server response is lost.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Wed, 30 Aug 2023 11:09:21 +0400 |
parents | ef4bdbbce57e |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_mail.h> typedef struct { ngx_array_t *from; /* array of ngx_cidr_t */ } ngx_mail_realip_srv_conf_t; static ngx_int_t ngx_mail_realip_set_addr(ngx_mail_session_t *s, ngx_addr_t *addr); static char *ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_mail_realip_create_srv_conf(ngx_conf_t *cf); static char *ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_command_t ngx_mail_realip_commands[] = { { ngx_string("set_real_ip_from"), NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, ngx_mail_realip_from, NGX_MAIL_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_mail_module_t ngx_mail_realip_module_ctx = { NULL, /* protocol */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_mail_realip_create_srv_conf, /* create server configuration */ ngx_mail_realip_merge_srv_conf /* merge server configuration */ }; ngx_module_t ngx_mail_realip_module = { NGX_MODULE_V1, &ngx_mail_realip_module_ctx, /* module context */ ngx_mail_realip_commands, /* module directives */ NGX_MAIL_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; ngx_int_t ngx_mail_realip_handler(ngx_mail_session_t *s) { ngx_addr_t addr; ngx_connection_t *c; ngx_mail_realip_srv_conf_t *rscf; rscf = ngx_mail_get_module_srv_conf(s, ngx_mail_realip_module); if (rscf->from == NULL) { return NGX_OK; } c = s->connection; if (c->proxy_protocol == NULL) { return NGX_OK; } if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) { return NGX_OK; } if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data, c->proxy_protocol->src_addr.len) != NGX_OK) { return NGX_OK; } ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port); return ngx_mail_realip_set_addr(s, &addr); } static ngx_int_t ngx_mail_realip_set_addr(ngx_mail_session_t *s, ngx_addr_t *addr) { size_t len; u_char *p; u_char text[NGX_SOCKADDR_STRLEN]; ngx_connection_t *c; c = s->connection; len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text, NGX_SOCKADDR_STRLEN, 0); if (len == 0) { return NGX_ERROR; } p = ngx_pnalloc(c->pool, len); if (p == NULL) { return NGX_ERROR; } ngx_memcpy(p, text, len); c->sockaddr = addr->sockaddr; c->socklen = addr->socklen; c->addr_text.len = len; c->addr_text.data = p; return NGX_OK; } static char * ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_mail_realip_srv_conf_t *rscf = conf; ngx_int_t rc; ngx_str_t *value; ngx_url_t u; ngx_cidr_t c, *cidr; ngx_uint_t i; struct sockaddr_in *sin; #if (NGX_HAVE_INET6) struct sockaddr_in6 *sin6; #endif value = cf->args->elts; if (rscf->from == NULL) { rscf->from = ngx_array_create(cf->pool, 2, sizeof(ngx_cidr_t)); if (rscf->from == NULL) { return NGX_CONF_ERROR; } } #if (NGX_HAVE_UNIX_DOMAIN) if (ngx_strcmp(value[1].data, "unix:") == 0) { cidr = ngx_array_push(rscf->from); if (cidr == NULL) { return NGX_CONF_ERROR; } cidr->family = AF_UNIX; return NGX_CONF_OK; } #endif rc = ngx_ptocidr(&value[1], &c); if (rc != NGX_ERROR) { if (rc == NGX_DONE) { ngx_conf_log_error(NGX_LOG_WARN, cf, 0, "low address bits of %V are meaningless", &value[1]); } cidr = ngx_array_push(rscf->from); if (cidr == NULL) { return NGX_CONF_ERROR; } *cidr = c; return NGX_CONF_OK; } ngx_memzero(&u, sizeof(ngx_url_t)); u.host = value[1]; if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { if (u.err) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s in set_real_ip_from \"%V\"", u.err, &u.host); } return NGX_CONF_ERROR; } cidr = ngx_array_push_n(rscf->from, u.naddrs); if (cidr == NULL) { return NGX_CONF_ERROR; } ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t)); for (i = 0; i < u.naddrs; i++) { cidr[i].family = u.addrs[i].sockaddr->sa_family; switch (cidr[i].family) { #if (NGX_HAVE_INET6) case AF_INET6: sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr; cidr[i].u.in6.addr = sin6->sin6_addr; ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16); break; #endif default: /* AF_INET */ sin = (struct sockaddr_in *) u.addrs[i].sockaddr; cidr[i].u.in.addr = sin->sin_addr.s_addr; cidr[i].u.in.mask = 0xffffffff; break; } } return NGX_CONF_OK; } static void * ngx_mail_realip_create_srv_conf(ngx_conf_t *cf) { ngx_mail_realip_srv_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_realip_srv_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->from = NULL; */ return conf; } static char * ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_mail_realip_srv_conf_t *prev = parent; ngx_mail_realip_srv_conf_t *conf = child; if (conf->from == NULL) { conf->from = prev->from; } return NGX_CONF_OK; }