1238106Sdes/* 2238106Sdes * daemon/acl_list.h - client access control storage for the server. 3238106Sdes * 4238106Sdes * Copyright (c) 2007, NLnet Labs. All rights reserved. 5238106Sdes * 6238106Sdes * This software is open source. 7238106Sdes * 8238106Sdes * Redistribution and use in source and binary forms, with or without 9238106Sdes * modification, are permitted provided that the following conditions 10238106Sdes * are met: 11238106Sdes * 12238106Sdes * Redistributions of source code must retain the above copyright notice, 13238106Sdes * this list of conditions and the following disclaimer. 14238106Sdes * 15238106Sdes * Redistributions in binary form must reproduce the above copyright notice, 16238106Sdes * this list of conditions and the following disclaimer in the documentation 17238106Sdes * and/or other materials provided with the distribution. 18238106Sdes * 19238106Sdes * Neither the name of the NLNET LABS nor the names of its contributors may 20238106Sdes * be used to endorse or promote products derived from this software without 21238106Sdes * specific prior written permission. 22238106Sdes * 23238106Sdes * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24269257Sdes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25269257Sdes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26269257Sdes * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27269257Sdes * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28269257Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29269257Sdes * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30269257Sdes * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31269257Sdes * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32269257Sdes * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33269257Sdes * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34238106Sdes */ 35238106Sdes 36238106Sdes/** 37238106Sdes * \file 38238106Sdes * 39238106Sdes * This file helps the server keep out queries from outside sources, that 40238106Sdes * should not be answered. 41238106Sdes */ 42238106Sdes#include "config.h" 43238106Sdes#include "daemon/acl_list.h" 44238106Sdes#include "util/regional.h" 45238106Sdes#include "util/log.h" 46238106Sdes#include "util/config_file.h" 47238106Sdes#include "util/net_help.h" 48238106Sdes 49238106Sdesstruct acl_list* 50238106Sdesacl_list_create(void) 51238106Sdes{ 52238106Sdes struct acl_list* acl = (struct acl_list*)calloc(1, 53238106Sdes sizeof(struct acl_list)); 54238106Sdes if(!acl) 55238106Sdes return NULL; 56238106Sdes acl->region = regional_create(); 57238106Sdes if(!acl->region) { 58238106Sdes acl_list_delete(acl); 59238106Sdes return NULL; 60238106Sdes } 61238106Sdes return acl; 62238106Sdes} 63238106Sdes 64238106Sdesvoid 65238106Sdesacl_list_delete(struct acl_list* acl) 66238106Sdes{ 67238106Sdes if(!acl) 68238106Sdes return; 69238106Sdes regional_destroy(acl->region); 70238106Sdes free(acl); 71238106Sdes} 72238106Sdes 73238106Sdes/** insert new address into acl_list structure */ 74238106Sdesstatic int 75238106Sdesacl_list_insert(struct acl_list* acl, struct sockaddr_storage* addr, 76238106Sdes socklen_t addrlen, int net, enum acl_access control, 77238106Sdes int complain_duplicates) 78238106Sdes{ 79238106Sdes struct acl_addr* node = regional_alloc(acl->region, 80238106Sdes sizeof(struct acl_addr)); 81238106Sdes if(!node) 82238106Sdes return 0; 83238106Sdes node->control = control; 84238106Sdes if(!addr_tree_insert(&acl->tree, &node->node, addr, addrlen, net)) { 85238106Sdes if(complain_duplicates) 86238106Sdes verbose(VERB_QUERY, "duplicate acl address ignored."); 87238106Sdes } 88238106Sdes return 1; 89238106Sdes} 90238106Sdes 91238106Sdes/** apply acl_list string */ 92238106Sdesstatic int 93238106Sdesacl_list_str_cfg(struct acl_list* acl, const char* str, const char* s2, 94238106Sdes int complain_duplicates) 95238106Sdes{ 96238106Sdes struct sockaddr_storage addr; 97238106Sdes int net; 98238106Sdes socklen_t addrlen; 99238106Sdes enum acl_access control; 100238106Sdes if(strcmp(s2, "allow") == 0) 101238106Sdes control = acl_allow; 102238106Sdes else if(strcmp(s2, "deny") == 0) 103238106Sdes control = acl_deny; 104238106Sdes else if(strcmp(s2, "refuse") == 0) 105238106Sdes control = acl_refuse; 106269257Sdes else if(strcmp(s2, "deny_non_local") == 0) 107269257Sdes control = acl_deny_non_local; 108269257Sdes else if(strcmp(s2, "refuse_non_local") == 0) 109269257Sdes control = acl_refuse_non_local; 110238106Sdes else if(strcmp(s2, "allow_snoop") == 0) 111238106Sdes control = acl_allow_snoop; 112238106Sdes else { 113238106Sdes log_err("access control type %s unknown", str); 114238106Sdes return 0; 115238106Sdes } 116238106Sdes if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) { 117238106Sdes log_err("cannot parse access control: %s %s", str, s2); 118238106Sdes return 0; 119238106Sdes } 120238106Sdes if(!acl_list_insert(acl, &addr, addrlen, net, control, 121238106Sdes complain_duplicates)) { 122238106Sdes log_err("out of memory"); 123238106Sdes return 0; 124238106Sdes } 125238106Sdes return 1; 126238106Sdes} 127238106Sdes 128238106Sdes/** read acl_list config */ 129238106Sdesstatic int 130238106Sdesread_acl_list(struct acl_list* acl, struct config_file* cfg) 131238106Sdes{ 132238106Sdes struct config_str2list* p; 133238106Sdes for(p = cfg->acls; p; p = p->next) { 134238106Sdes log_assert(p->str && p->str2); 135238106Sdes if(!acl_list_str_cfg(acl, p->str, p->str2, 1)) 136238106Sdes return 0; 137238106Sdes } 138238106Sdes return 1; 139238106Sdes} 140238106Sdes 141238106Sdesint 142238106Sdesacl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg) 143238106Sdes{ 144238106Sdes regional_free_all(acl->region); 145238106Sdes addr_tree_init(&acl->tree); 146238106Sdes if(!read_acl_list(acl, cfg)) 147238106Sdes return 0; 148238106Sdes /* insert defaults, with '0' to ignore them if they are duplicates */ 149238106Sdes if(!acl_list_str_cfg(acl, "0.0.0.0/0", "refuse", 0)) 150238106Sdes return 0; 151238106Sdes if(!acl_list_str_cfg(acl, "127.0.0.0/8", "allow", 0)) 152238106Sdes return 0; 153238106Sdes if(cfg->do_ip6) { 154238106Sdes if(!acl_list_str_cfg(acl, "::0/0", "refuse", 0)) 155238106Sdes return 0; 156238106Sdes if(!acl_list_str_cfg(acl, "::1", "allow", 0)) 157238106Sdes return 0; 158238106Sdes if(!acl_list_str_cfg(acl, "::ffff:127.0.0.1", "allow", 0)) 159238106Sdes return 0; 160238106Sdes } 161238106Sdes addr_tree_init_parents(&acl->tree); 162238106Sdes return 1; 163238106Sdes} 164238106Sdes 165238106Sdesenum acl_access 166238106Sdesacl_list_lookup(struct acl_list* acl, struct sockaddr_storage* addr, 167238106Sdes socklen_t addrlen) 168238106Sdes{ 169238106Sdes struct acl_addr* r = (struct acl_addr*)addr_tree_lookup(&acl->tree, 170238106Sdes addr, addrlen); 171238106Sdes if(r) return r->control; 172238106Sdes return acl_deny; 173238106Sdes} 174238106Sdes 175238106Sdessize_t 176238106Sdesacl_list_get_mem(struct acl_list* acl) 177238106Sdes{ 178238106Sdes if(!acl) return 0; 179238106Sdes return sizeof(*acl) + regional_get_mem(acl->region); 180238106Sdes} 181