diff options
Diffstat (limited to 'src/http/modules/ngx_http_access_module.c')
| -rw-r--r-- | src/http/modules/ngx_http_access_module.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_access_module.c b/src/http/modules/ngx_http_access_module.c new file mode 100644 index 000000000..685d15d57 --- /dev/null +++ b/src/http/modules/ngx_http_access_module.c @@ -0,0 +1,219 @@ + +/* + * 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, /* pre conf */ + + 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, + &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; +} |