Mercurial > hg > nginx-quic
view src/mail/ngx_mail_realip_module.c @ 8472:aa5f8825f24d
Resolver: fixed label types handling in ngx_resolver_copy().
Previously, anything with any of the two high bits set were interpreted
as compression pointers. This is incorrect, as RFC 1035 clearly states
that "The 10 and 01 combinations are reserved for future use". Further,
the 01 combination is actually allocated for EDNS extended label type
(see RFC 2671 and RFC 6891), not really used though.
Fix is to reject unrecognized label types rather than misinterpreting
them as compression pointers.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 25 May 2021 15:17:41 +0300 |
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; }