Mercurial > hg > nginx-quic
view src/stream/ngx_stream_realip_module.c @ 8700:b09f055daa4e quic
QUIC: fixed handling of RETIRE_CONNECTION_ID frame.
Previously, the retired socket was not closed if it didn't match
active or backup.
New sockets could not be created (due to count limit), since retired socket
was not closed before calling ngx_quic_create_sockets().
When replacing retired socket, new socket is only requested after closing
old one, to avoid hitting the limit on the number of active connection ids.
Together with added restrictions, this fixes an issue when a current socket
could be closed during migration, recreated and erroneously reused leading
to null pointer dereference.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Thu, 18 Nov 2021 14:19:36 +0300 |
parents | 06b01840bd42 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { ngx_array_t *from; /* array of ngx_cidr_t */ } ngx_stream_realip_srv_conf_t; typedef struct { struct sockaddr *sockaddr; socklen_t socklen; ngx_str_t addr_text; } ngx_stream_realip_ctx_t; static ngx_int_t ngx_stream_realip_handler(ngx_stream_session_t *s); static ngx_int_t ngx_stream_realip_set_addr(ngx_stream_session_t *s, ngx_addr_t *addr); static char *ngx_stream_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_stream_realip_create_srv_conf(ngx_conf_t *cf); static char *ngx_stream_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_stream_realip_add_variables(ngx_conf_t *cf); static ngx_int_t ngx_stream_realip_init(ngx_conf_t *cf); static ngx_int_t ngx_stream_realip_remote_addr_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_stream_realip_remote_port_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data); static ngx_command_t ngx_stream_realip_commands[] = { { ngx_string("set_real_ip_from"), NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, ngx_stream_realip_from, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_stream_module_t ngx_stream_realip_module_ctx = { ngx_stream_realip_add_variables, /* preconfiguration */ ngx_stream_realip_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_realip_create_srv_conf, /* create server configuration */ ngx_stream_realip_merge_srv_conf /* merge server configuration */ }; ngx_module_t ngx_stream_realip_module = { NGX_MODULE_V1, &ngx_stream_realip_module_ctx, /* module context */ ngx_stream_realip_commands, /* module directives */ NGX_STREAM_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 }; static ngx_stream_variable_t ngx_stream_realip_vars[] = { { ngx_string("realip_remote_addr"), NULL, ngx_stream_realip_remote_addr_variable, 0, 0, 0 }, { ngx_string("realip_remote_port"), NULL, ngx_stream_realip_remote_port_variable, 0, 0, 0 }, ngx_stream_null_variable }; static ngx_int_t ngx_stream_realip_handler(ngx_stream_session_t *s) { ngx_addr_t addr; ngx_connection_t *c; ngx_stream_realip_srv_conf_t *rscf; rscf = ngx_stream_get_module_srv_conf(s, ngx_stream_realip_module); if (rscf->from == NULL) { return NGX_DECLINED; } c = s->connection; if (c->proxy_protocol == NULL) { return NGX_DECLINED; } if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) { return NGX_DECLINED; } if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data, c->proxy_protocol->src_addr.len) != NGX_OK) { return NGX_DECLINED; } ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port); return ngx_stream_realip_set_addr(s, &addr); } static ngx_int_t ngx_stream_realip_set_addr(ngx_stream_session_t *s, ngx_addr_t *addr) { size_t len; u_char *p; u_char text[NGX_SOCKADDR_STRLEN]; ngx_connection_t *c; ngx_stream_realip_ctx_t *ctx; c = s->connection; ctx = ngx_palloc(c->pool, sizeof(ngx_stream_realip_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } 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); ngx_stream_set_ctx(s, ctx, ngx_stream_realip_module); ctx->sockaddr = c->sockaddr; ctx->socklen = c->socklen; ctx->addr_text = c->addr_text; c->sockaddr = addr->sockaddr; c->socklen = addr->socklen; c->addr_text.len = len; c->addr_text.data = p; return NGX_DECLINED; } static char * ngx_stream_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_stream_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_stream_realip_create_srv_conf(ngx_conf_t *cf) { ngx_stream_realip_srv_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_realip_srv_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->from = NULL; */ return conf; } static char * ngx_stream_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_stream_realip_srv_conf_t *prev = parent; ngx_stream_realip_srv_conf_t *conf = child; if (conf->from == NULL) { conf->from = prev->from; } return NGX_CONF_OK; } static ngx_int_t ngx_stream_realip_add_variables(ngx_conf_t *cf) { ngx_stream_variable_t *var, *v; for (v = ngx_stream_realip_vars; v->name.len; v++) { var = ngx_stream_add_variable(cf, &v->name, v->flags); if (var == NULL) { return NGX_ERROR; } var->get_handler = v->get_handler; var->data = v->data; } return NGX_OK; } static ngx_int_t ngx_stream_realip_init(ngx_conf_t *cf) { ngx_stream_handler_pt *h; ngx_stream_core_main_conf_t *cmcf; cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); h = ngx_array_push(&cmcf->phases[NGX_STREAM_POST_ACCEPT_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_stream_realip_handler; return NGX_OK; } static ngx_int_t ngx_stream_realip_remote_addr_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { ngx_str_t *addr_text; ngx_stream_realip_ctx_t *ctx; ctx = ngx_stream_get_module_ctx(s, ngx_stream_realip_module); addr_text = ctx ? &ctx->addr_text : &s->connection->addr_text; v->len = addr_text->len; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = addr_text->data; return NGX_OK; } static ngx_int_t ngx_stream_realip_remote_port_variable(ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data) { ngx_uint_t port; struct sockaddr *sa; ngx_stream_realip_ctx_t *ctx; ctx = ngx_stream_get_module_ctx(s, ngx_stream_realip_module); sa = ctx ? ctx->sockaddr : s->connection->sockaddr; v->len = 0; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->data = ngx_pnalloc(s->connection->pool, sizeof("65535") - 1); if (v->data == NULL) { return NGX_ERROR; } port = ngx_inet_get_port(sa); if (port > 0 && port < 65536) { v->len = ngx_sprintf(v->data, "%ui", port) - v->data; } return NGX_OK; }