| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_http.h> |
| |
| |
| typedef struct { |
| in_addr_t mask; |
| in_addr_t addr; |
| ngx_uint_t deny; /* unsigned deny:1; */ |
| } ngx_http_access_rule_t; |
| |
| #if (NGX_HAVE_INET6) |
| |
| typedef struct { |
| struct in6_addr addr; |
| struct in6_addr mask; |
| ngx_uint_t deny; /* unsigned deny:1; */ |
| } ngx_http_access_rule6_t; |
| |
| #endif |
| |
| typedef struct { |
| ngx_array_t *rules; /* array of ngx_http_access_rule_t */ |
| #if (NGX_HAVE_INET6) |
| ngx_array_t *rules6; /* array of ngx_http_access_rule6_t */ |
| #endif |
| } ngx_http_access_loc_conf_t; |
| |
| |
| static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r); |
| static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r, |
| ngx_http_access_loc_conf_t *alcf, in_addr_t addr); |
| #if (NGX_HAVE_INET6) |
| static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r, |
| ngx_http_access_loc_conf_t *alcf, u_char *p); |
| #endif |
| static ngx_int_t ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny); |
| 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_conf_t *cf); |
| |
| |
| static ngx_command_t ngx_http_access_commands[] = { |
| |
| { ngx_string("allow"), |
| NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_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_HTTP_LMT_CONF |
| |NGX_CONF_TAKE1, |
| ngx_http_access_rule, |
| NGX_HTTP_LOC_CONF_OFFSET, |
| 0, |
| NULL }, |
| |
| ngx_null_command |
| }; |
| |
| |
| |
| static ngx_http_module_t ngx_http_access_module_ctx = { |
| NULL, /* preconfiguration */ |
| ngx_http_access_init, /* 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 */ |
| 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_int_t |
| ngx_http_access_handler(ngx_http_request_t *r) |
| { |
| struct sockaddr_in *sin; |
| ngx_http_access_loc_conf_t *alcf; |
| #if (NGX_HAVE_INET6) |
| u_char *p; |
| in_addr_t addr; |
| struct sockaddr_in6 *sin6; |
| #endif |
| |
| alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module); |
| |
| switch (r->connection->sockaddr->sa_family) { |
| |
| case AF_INET: |
| if (alcf->rules) { |
| sin = (struct sockaddr_in *) r->connection->sockaddr; |
| return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr); |
| } |
| break; |
| |
| #if (NGX_HAVE_INET6) |
| |
| case AF_INET6: |
| sin6 = (struct sockaddr_in6 *) r->connection->sockaddr; |
| p = sin6->sin6_addr.s6_addr; |
| |
| if (alcf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { |
| addr = p[12] << 24; |
| addr += p[13] << 16; |
| addr += p[14] << 8; |
| addr += p[15]; |
| return ngx_http_access_inet(r, alcf, htonl(addr)); |
| } |
| |
| if (alcf->rules6) { |
| return ngx_http_access_inet6(r, alcf, p); |
| } |
| |
| #endif |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf, |
| in_addr_t addr) |
| { |
| ngx_uint_t i; |
| ngx_http_access_rule_t *rule; |
| |
| rule = alcf->rules->elts; |
| for (i = 0; i < alcf->rules->nelts; i++) { |
| |
| ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| "access: %08XD %08XD %08XD", |
| addr, rule[i].mask, rule[i].addr); |
| |
| if ((addr & rule[i].mask) == rule[i].addr) { |
| return ngx_http_access_found(r, rule[i].deny); |
| } |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| |
| #if (NGX_HAVE_INET6) |
| |
| static ngx_int_t |
| ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf, |
| u_char *p) |
| { |
| ngx_uint_t n; |
| ngx_uint_t i; |
| ngx_http_access_rule6_t *rule6; |
| |
| rule6 = alcf->rules6->elts; |
| for (i = 0; i < alcf->rules6->nelts; i++) { |
| |
| #if (NGX_DEBUG) |
| { |
| size_t cl, ml, al; |
| u_char ct[NGX_INET6_ADDRSTRLEN]; |
| u_char mt[NGX_INET6_ADDRSTRLEN]; |
| u_char at[NGX_INET6_ADDRSTRLEN]; |
| |
| cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN); |
| ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN); |
| al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN); |
| |
| ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| "access: %*s %*s %*s", cl, ct, ml, mt, al, at); |
| } |
| #endif |
| |
| for (n = 0; n < 16; n++) { |
| if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) { |
| goto next; |
| } |
| } |
| |
| return ngx_http_access_found(r, rule6[i].deny); |
| |
| next: |
| continue; |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| #endif |
| |
| |
| static ngx_int_t |
| ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny) |
| { |
| ngx_http_core_loc_conf_t *clcf; |
| |
| if (deny) { |
| clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
| |
| if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) { |
| ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| "access forbidden by rule"); |
| } |
| |
| return NGX_HTTP_FORBIDDEN; |
| } |
| |
| 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_int_t rc; |
| ngx_uint_t all; |
| ngx_str_t *value; |
| ngx_cidr_t cidr; |
| ngx_http_access_rule_t *rule; |
| #if (NGX_HAVE_INET6) |
| ngx_http_access_rule6_t *rule6; |
| #endif |
| |
| ngx_memzero(&cidr, sizeof(ngx_cidr_t)); |
| |
| value = cf->args->elts; |
| |
| all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0); |
| |
| if (!all) { |
| |
| rc = ngx_ptocidr(&value[1], &cidr); |
| |
| if (rc == NGX_ERROR) { |
| ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| "invalid parameter \"%V\"", &value[1]); |
| return NGX_CONF_ERROR; |
| } |
| |
| if (rc == NGX_DONE) { |
| ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
| "low address bits of %V are meaningless", &value[1]); |
| } |
| } |
| |
| switch (cidr.family) { |
| |
| #if (NGX_HAVE_INET6) |
| case AF_INET6: |
| case 0: /* all */ |
| |
| if (alcf->rules6 == NULL) { |
| alcf->rules6 = ngx_array_create(cf->pool, 4, |
| sizeof(ngx_http_access_rule6_t)); |
| if (alcf->rules6 == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| } |
| |
| rule6 = ngx_array_push(alcf->rules6); |
| if (rule6 == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| |
| rule6->mask = cidr.u.in6.mask; |
| rule6->addr = cidr.u.in6.addr; |
| rule6->deny = (value[0].data[0] == 'd') ? 1 : 0; |
| |
| if (!all) { |
| break; |
| } |
| |
| /* "all" passes through */ |
| #endif |
| |
| default: /* AF_INET */ |
| |
| 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; |
| } |
| |
| rule->mask = cidr.u.in.mask; |
| rule->addr = cidr.u.in.addr; |
| rule->deny = (value[0].data[0] == 'd') ? 1 : 0; |
| } |
| |
| 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 NULL; |
| } |
| |
| 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 (NGX_HAVE_INET6) |
| |
| if (conf->rules == NULL && conf->rules6 == NULL) { |
| conf->rules = prev->rules; |
| conf->rules6 = prev->rules6; |
| } |
| |
| #else |
| |
| if (conf->rules == NULL) { |
| conf->rules = prev->rules; |
| } |
| |
| #endif |
| |
| return NGX_CONF_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_access_init(ngx_conf_t *cf) |
| { |
| ngx_http_handler_pt *h; |
| ngx_http_core_main_conf_t *cmcf; |
| |
| cmcf = ngx_http_conf_get_module_main_conf(cf, 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; |
| } |
