mirror of
https://github.com/nginx/nginx.git
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377 lines
9.6 KiB
C
377 lines
9.6 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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typedef struct {
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in_addr_t mask;
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in_addr_t addr;
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ngx_uint_t deny; /* unsigned deny:1; */
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} ngx_http_access_rule_t;
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#if (NGX_HAVE_INET6)
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typedef struct {
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struct in6_addr addr;
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struct in6_addr mask;
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ngx_uint_t deny; /* unsigned deny:1; */
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} ngx_http_access_rule6_t;
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#endif
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typedef struct {
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ngx_array_t *rules; /* array of ngx_http_access_rule_t */
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#if (NGX_HAVE_INET6)
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ngx_array_t *rules6; /* array of ngx_http_access_rule6_t */
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#endif
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} ngx_http_access_loc_conf_t;
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static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
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static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r,
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ngx_http_access_loc_conf_t *alcf, in_addr_t addr);
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#if (NGX_HAVE_INET6)
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static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r,
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ngx_http_access_loc_conf_t *alcf, u_char *p);
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#endif
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static ngx_int_t ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny);
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static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
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static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
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void *parent, void *child);
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static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);
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static ngx_command_t ngx_http_access_commands[] = {
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{ ngx_string("allow"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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|NGX_CONF_TAKE1,
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ngx_http_access_rule,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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{ ngx_string("deny"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
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|NGX_CONF_TAKE1,
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ngx_http_access_rule,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_access_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_access_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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ngx_http_access_create_loc_conf, /* create location configuration */
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ngx_http_access_merge_loc_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_access_module = {
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NGX_MODULE_V1,
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&ngx_http_access_module_ctx, /* module context */
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ngx_http_access_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_http_access_handler(ngx_http_request_t *r)
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{
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struct sockaddr_in *sin;
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ngx_http_access_loc_conf_t *alcf;
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alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
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#if (NGX_HAVE_INET6)
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if (alcf->rules6 && r->connection->sockaddr->sa_family == AF_INET6) {
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u_char *p;
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in_addr_t addr;
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struct sockaddr_in6 *sin6;
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sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
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p = sin6->sin6_addr.s6_addr;
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if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
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addr = p[12] << 24;
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addr += p[13] << 16;
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addr += p[14] << 8;
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addr += p[15];
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return ngx_http_access_inet(r, alcf, htonl(addr));
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}
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return ngx_http_access_inet6(r, alcf, p);
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}
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#endif
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if (alcf->rules && r->connection->sockaddr->sa_family == AF_INET) {
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sin = (struct sockaddr_in *) r->connection->sockaddr;
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return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr);
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}
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return NGX_DECLINED;
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}
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static ngx_int_t
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ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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in_addr_t addr)
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{
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ngx_uint_t i;
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ngx_http_access_rule_t *rule;
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rule = alcf->rules->elts;
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for (i = 0; i < alcf->rules->nelts; i++) {
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ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"access: %08XD %08XD %08XD",
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addr, rule[i].mask, rule[i].addr);
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if ((addr & rule[i].mask) == rule[i].addr) {
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return ngx_http_access_found(r, rule[i].deny);
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}
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}
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return NGX_DECLINED;
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}
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#if (NGX_HAVE_INET6)
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static ngx_int_t
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ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
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u_char *p)
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{
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ngx_uint_t n;
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ngx_uint_t i;
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ngx_http_access_rule6_t *rule6;
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rule6 = alcf->rules6->elts;
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for (i = 0; i < alcf->rules6->nelts; i++) {
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#if (NGX_DEBUG)
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{
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size_t cl, ml, al;
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u_char ct[NGX_INET6_ADDRSTRLEN];
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u_char mt[NGX_INET6_ADDRSTRLEN];
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u_char at[NGX_INET6_ADDRSTRLEN];
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cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
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ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
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al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
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ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"access: %*s %*s %*s", cl, ct, ml, mt, al, at);
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}
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#endif
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for (n = 0; n < 16; n++) {
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if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
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goto next;
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}
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}
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return ngx_http_access_found(r, rule6[i].deny);
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next:
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continue;
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}
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return NGX_DECLINED;
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}
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#endif
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static ngx_int_t
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ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny)
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{
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ngx_http_core_loc_conf_t *clcf;
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if (deny) {
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
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ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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"access forbidden by rule");
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}
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return NGX_HTTP_FORBIDDEN;
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}
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return NGX_OK;
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}
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static char *
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ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_http_access_loc_conf_t *alcf = conf;
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ngx_int_t rc;
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ngx_uint_t all;
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ngx_str_t *value;
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ngx_cidr_t cidr;
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ngx_http_access_rule_t *rule;
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#if (NGX_HAVE_INET6)
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ngx_http_access_rule6_t *rule6;
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#endif
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ngx_memzero(&cidr, sizeof(ngx_cidr_t));
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value = cf->args->elts;
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all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0);
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if (!all) {
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rc = ngx_ptocidr(&value[1], &cidr);
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if (rc == NGX_ERROR) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"invalid parameter \"%V\"", &value[1]);
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return NGX_CONF_ERROR;
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}
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if (rc == NGX_DONE) {
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ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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"low address bits of %V are meaningless", &value[1]);
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}
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}
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switch (cidr.family) {
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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case 0: /* all */
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if (alcf->rules6 == NULL) {
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alcf->rules6 = ngx_array_create(cf->pool, 4,
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sizeof(ngx_http_access_rule6_t));
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if (alcf->rules6 == NULL) {
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return NGX_CONF_ERROR;
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}
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}
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rule6 = ngx_array_push(alcf->rules6);
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if (rule6 == NULL) {
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return NGX_CONF_ERROR;
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}
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rule6->mask = cidr.u.in6.mask;
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rule6->addr = cidr.u.in6.addr;
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rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
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if (!all) {
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break;
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}
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/* "all" passes through */
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#endif
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default: /* AF_INET */
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if (alcf->rules == NULL) {
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alcf->rules = ngx_array_create(cf->pool, 4,
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sizeof(ngx_http_access_rule_t));
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if (alcf->rules == NULL) {
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return NGX_CONF_ERROR;
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}
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}
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rule = ngx_array_push(alcf->rules);
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if (rule == NULL) {
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return NGX_CONF_ERROR;
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}
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rule->mask = cidr.u.in.mask;
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rule->addr = cidr.u.in.addr;
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rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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}
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return NGX_CONF_OK;
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}
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static void *
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ngx_http_access_create_loc_conf(ngx_conf_t *cf)
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{
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ngx_http_access_loc_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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return conf;
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}
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static char *
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ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_http_access_loc_conf_t *prev = parent;
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ngx_http_access_loc_conf_t *conf = child;
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if (conf->rules == NULL) {
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conf->rules = prev->rules;
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}
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#if (NGX_HAVE_INET6)
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if (conf->rules6 == NULL) {
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conf->rules6 = prev->rules6;
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}
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#endif
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return NGX_CONF_OK;
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}
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static ngx_int_t
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ngx_http_access_init(ngx_conf_t *cf)
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{
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ngx_http_handler_pt *h;
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ngx_http_core_main_conf_t *cmcf;
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cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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*h = ngx_http_access_handler;
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return NGX_OK;
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}
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