| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_stream.h> |
| |
| |
| typedef struct { |
| in_addr_t mask; |
| in_addr_t addr; |
| ngx_uint_t deny; /* unsigned deny:1; */ |
| } ngx_stream_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_stream_access_rule6_t; |
| |
| #endif |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| |
| typedef struct { |
| ngx_uint_t deny; /* unsigned deny:1; */ |
| } ngx_stream_access_rule_un_t; |
| |
| #endif |
| |
| typedef struct { |
| ngx_array_t *rules; /* array of ngx_stream_access_rule_t */ |
| #if (NGX_HAVE_INET6) |
| ngx_array_t *rules6; /* array of ngx_stream_access_rule6_t */ |
| #endif |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| ngx_array_t *rules_un; /* array of ngx_stream_access_rule_un_t */ |
| #endif |
| } ngx_stream_access_srv_conf_t; |
| |
| |
| static ngx_int_t ngx_stream_access_handler(ngx_stream_session_t *s); |
| static ngx_int_t ngx_stream_access_inet(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf, in_addr_t addr); |
| #if (NGX_HAVE_INET6) |
| static ngx_int_t ngx_stream_access_inet6(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf, u_char *p); |
| #endif |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| static ngx_int_t ngx_stream_access_unix(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf); |
| #endif |
| static ngx_int_t ngx_stream_access_found(ngx_stream_session_t *s, |
| ngx_uint_t deny); |
| static char *ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, |
| void *conf); |
| static void *ngx_stream_access_create_srv_conf(ngx_conf_t *cf); |
| static char *ngx_stream_access_merge_srv_conf(ngx_conf_t *cf, |
| void *parent, void *child); |
| static ngx_int_t ngx_stream_access_init(ngx_conf_t *cf); |
| |
| |
| static ngx_command_t ngx_stream_access_commands[] = { |
| |
| { ngx_string("allow"), |
| NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, |
| ngx_stream_access_rule, |
| NGX_STREAM_SRV_CONF_OFFSET, |
| 0, |
| NULL }, |
| |
| { ngx_string("deny"), |
| NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1, |
| ngx_stream_access_rule, |
| NGX_STREAM_SRV_CONF_OFFSET, |
| 0, |
| NULL }, |
| |
| ngx_null_command |
| }; |
| |
| |
| |
| static ngx_stream_module_t ngx_stream_access_module_ctx = { |
| NULL, /* preconfiguration */ |
| ngx_stream_access_init, /* postconfiguration */ |
| |
| NULL, /* create main configuration */ |
| NULL, /* init main configuration */ |
| |
| ngx_stream_access_create_srv_conf, /* create server configuration */ |
| ngx_stream_access_merge_srv_conf /* merge server configuration */ |
| }; |
| |
| |
| ngx_module_t ngx_stream_access_module = { |
| NGX_MODULE_V1, |
| &ngx_stream_access_module_ctx, /* module context */ |
| ngx_stream_access_commands, /* module directives */ |
| NGX_STREAM_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_stream_access_handler(ngx_stream_session_t *s) |
| { |
| struct sockaddr_in *sin; |
| ngx_stream_access_srv_conf_t *ascf; |
| #if (NGX_HAVE_INET6) |
| u_char *p; |
| in_addr_t addr; |
| struct sockaddr_in6 *sin6; |
| #endif |
| |
| ascf = ngx_stream_get_module_srv_conf(s, ngx_stream_access_module); |
| |
| switch (s->connection->sockaddr->sa_family) { |
| |
| case AF_INET: |
| if (ascf->rules) { |
| sin = (struct sockaddr_in *) s->connection->sockaddr; |
| return ngx_stream_access_inet(s, ascf, sin->sin_addr.s_addr); |
| } |
| break; |
| |
| #if (NGX_HAVE_INET6) |
| |
| case AF_INET6: |
| sin6 = (struct sockaddr_in6 *) s->connection->sockaddr; |
| p = sin6->sin6_addr.s6_addr; |
| |
| if (ascf->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_stream_access_inet(s, ascf, htonl(addr)); |
| } |
| |
| if (ascf->rules6) { |
| return ngx_stream_access_inet6(s, ascf, p); |
| } |
| |
| break; |
| |
| #endif |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| |
| case AF_UNIX: |
| if (ascf->rules_un) { |
| return ngx_stream_access_unix(s, ascf); |
| } |
| |
| break; |
| |
| #endif |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| |
| static ngx_int_t |
| ngx_stream_access_inet(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf, in_addr_t addr) |
| { |
| ngx_uint_t i; |
| ngx_stream_access_rule_t *rule; |
| |
| rule = ascf->rules->elts; |
| for (i = 0; i < ascf->rules->nelts; i++) { |
| |
| ngx_log_debug3(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, |
| "access: %08XD %08XD %08XD", |
| addr, rule[i].mask, rule[i].addr); |
| |
| if ((addr & rule[i].mask) == rule[i].addr) { |
| return ngx_stream_access_found(s, rule[i].deny); |
| } |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| |
| #if (NGX_HAVE_INET6) |
| |
| static ngx_int_t |
| ngx_stream_access_inet6(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf, u_char *p) |
| { |
| ngx_uint_t n; |
| ngx_uint_t i; |
| ngx_stream_access_rule6_t *rule6; |
| |
| rule6 = ascf->rules6->elts; |
| for (i = 0; i < ascf->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_STREAM, s->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_stream_access_found(s, rule6[i].deny); |
| |
| next: |
| continue; |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| #endif |
| |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| |
| static ngx_int_t |
| ngx_stream_access_unix(ngx_stream_session_t *s, |
| ngx_stream_access_srv_conf_t *ascf) |
| { |
| ngx_uint_t i; |
| ngx_stream_access_rule_un_t *rule_un; |
| |
| rule_un = ascf->rules_un->elts; |
| for (i = 0; i < ascf->rules_un->nelts; i++) { |
| |
| /* TODO: check path */ |
| if (1) { |
| return ngx_stream_access_found(s, rule_un[i].deny); |
| } |
| } |
| |
| return NGX_DECLINED; |
| } |
| |
| #endif |
| |
| |
| static ngx_int_t |
| ngx_stream_access_found(ngx_stream_session_t *s, ngx_uint_t deny) |
| { |
| if (deny) { |
| ngx_log_error(NGX_LOG_ERR, s->connection->log, 0, |
| "access forbidden by rule"); |
| return NGX_STREAM_FORBIDDEN; |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| static char * |
| ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| { |
| ngx_stream_access_srv_conf_t *ascf = conf; |
| |
| ngx_int_t rc; |
| ngx_uint_t all; |
| ngx_str_t *value; |
| ngx_cidr_t cidr; |
| ngx_stream_access_rule_t *rule; |
| #if (NGX_HAVE_INET6) |
| ngx_stream_access_rule6_t *rule6; |
| #endif |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| ngx_stream_access_rule_un_t *rule_un; |
| #endif |
| |
| all = 0; |
| ngx_memzero(&cidr, sizeof(ngx_cidr_t)); |
| |
| value = cf->args->elts; |
| |
| if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) { |
| all = 1; |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| } else if (value[1].len == 5 && ngx_strcmp(value[1].data, "unix:") == 0) { |
| cidr.family = AF_UNIX; |
| #endif |
| |
| } else { |
| 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]); |
| } |
| } |
| |
| if (cidr.family == AF_INET || all) { |
| |
| if (ascf->rules == NULL) { |
| ascf->rules = ngx_array_create(cf->pool, 4, |
| sizeof(ngx_stream_access_rule_t)); |
| if (ascf->rules == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| } |
| |
| rule = ngx_array_push(ascf->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; |
| } |
| |
| #if (NGX_HAVE_INET6) |
| if (cidr.family == AF_INET6 || all) { |
| |
| if (ascf->rules6 == NULL) { |
| ascf->rules6 = ngx_array_create(cf->pool, 4, |
| sizeof(ngx_stream_access_rule6_t)); |
| if (ascf->rules6 == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| } |
| |
| rule6 = ngx_array_push(ascf->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; |
| } |
| #endif |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| if (cidr.family == AF_UNIX || all) { |
| |
| if (ascf->rules_un == NULL) { |
| ascf->rules_un = ngx_array_create(cf->pool, 1, |
| sizeof(ngx_stream_access_rule_un_t)); |
| if (ascf->rules_un == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| } |
| |
| rule_un = ngx_array_push(ascf->rules_un); |
| if (rule_un == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| |
| rule_un->deny = (value[0].data[0] == 'd') ? 1 : 0; |
| } |
| #endif |
| |
| return NGX_CONF_OK; |
| } |
| |
| |
| static void * |
| ngx_stream_access_create_srv_conf(ngx_conf_t *cf) |
| { |
| ngx_stream_access_srv_conf_t *conf; |
| |
| conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_access_srv_conf_t)); |
| if (conf == NULL) { |
| return NULL; |
| } |
| |
| return conf; |
| } |
| |
| |
| static char * |
| ngx_stream_access_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
| { |
| ngx_stream_access_srv_conf_t *prev = parent; |
| ngx_stream_access_srv_conf_t *conf = child; |
| |
| if (conf->rules == NULL |
| #if (NGX_HAVE_INET6) |
| && conf->rules6 == NULL |
| #endif |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| && conf->rules_un == NULL |
| #endif |
| ) { |
| conf->rules = prev->rules; |
| #if (NGX_HAVE_INET6) |
| conf->rules6 = prev->rules6; |
| #endif |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| conf->rules_un = prev->rules_un; |
| #endif |
| } |
| |
| return NGX_CONF_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_stream_access_init(ngx_conf_t *cf) |
| { |
| ngx_stream_handler_pt *h; |
| ngx_stream_core_main_conf_t *cmcf; |
| |
| cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module); |
| |
| h = ngx_array_push(&cmcf->phases[NGX_STREAM_ACCESS_PHASE].handlers); |
| if (h == NULL) { |
| return NGX_ERROR; |
| } |
| |
| *h = ngx_stream_access_handler; |
| |
| return NGX_OK; |
| } |
