Mercurial > hg > nginx-quic
view src/mail/ngx_mail_realip_module.c @ 8551:c35b255d80dc quic
HTTP/3: close connection on keepalive_requests * 2.
After receiving GOAWAY, client is not supposed to create new streams. However,
until client reads this frame, we allow it to create new streams, which are
gracefully rejected. To prevent client from abusing this algorithm, a new
limit is introduced. Upon reaching keepalive_requests * 2, server now closes
the entire QUIC connection claiming excessive load.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 29 Jul 2021 16:01:37 +0300 |
parents | ef4bdbbce57e |
children |
line wrap: on
line source
/* * 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; }