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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
/* AF_INET only */
typedef struct {
in_addr_t mask;
in_addr_t addr;
unsigned deny;
} ngx_http_access_rule_t;
typedef struct {
ngx_array_t *rules; /* array of ngx_http_access_rule_t */
} ngx_http_access_loc_conf_t;
static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_access_init(ngx_cycle_t *cycle);
static ngx_command_t ngx_http_access_commands[] = {
{ ngx_string("allow"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_access_rule,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("deny"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_access_rule,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
ngx_http_module_t ngx_http_access_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_access_create_loc_conf, /* create location configuration */
ngx_http_access_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_access_module = {
NGX_MODULE_V1,
&ngx_http_access_module_ctx, /* module context */
ngx_http_access_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_access_init, /* init module */
NULL /* init process */
};
static ngx_int_t
ngx_http_access_handler(ngx_http_request_t *r)
{
ngx_uint_t i;
struct sockaddr_in *sin;
ngx_http_access_rule_t *rule;
ngx_http_access_loc_conf_t *alcf;
alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
if (alcf->rules == NULL) {
return NGX_OK;
}
/* AF_INET only */
sin = (struct sockaddr_in *) r->connection->sockaddr;
rule = alcf->rules->elts;
for (i = 0; i < alcf->rules->nelts; i++) {
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"%08XD %08XD %08XD",
sin->sin_addr.s_addr, rule[i].mask, rule[i].addr);
if ((sin->sin_addr.s_addr & rule[i].mask) == rule[i].addr) {
if (rule[i].deny) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"access forbidden by rule");
return NGX_HTTP_FORBIDDEN;
}
return NGX_OK;
}
}
return NGX_OK;
}
static char *
ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_access_loc_conf_t *alcf = conf;
ngx_str_t *value;
ngx_inet_cidr_t in_cidr;
ngx_http_access_rule_t *rule;
if (alcf->rules == NULL) {
alcf->rules = ngx_array_create(cf->pool, 4,
sizeof(ngx_http_access_rule_t));
if (alcf->rules == NULL) {
return NGX_CONF_ERROR;
}
}
rule = ngx_array_push(alcf->rules);
if (rule == NULL) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
rule->mask = 0;
rule->addr = 0;
return NGX_CONF_OK;
}
rule->addr = inet_addr((char *) value[1].data);
if (rule->addr != INADDR_NONE) {
rule->mask = 0xffffffff;
return NGX_CONF_OK;
}
if (ngx_ptocidr(&value[1], &in_cidr) == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
&value[1]);
return NGX_CONF_ERROR;
}
rule->mask = in_cidr.mask;
rule->addr = in_cidr.addr;
return NGX_CONF_OK;
}
static void *
ngx_http_access_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_access_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
if (conf == NULL) {
return NGX_CONF_ERROR;
}
return conf;
}
static char *
ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_access_loc_conf_t *prev = parent;
ngx_http_access_loc_conf_t *conf = child;
if (conf->rules == NULL) {
conf->rules = prev->rules;
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_access_init(ngx_cycle_t *cycle)
{
ngx_http_handler_pt *h;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_access_handler;
return NGX_OK;
}
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