181 lines
5 KiB
C
181 lines
5 KiB
C
/*
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* daemon/acl_list.h - client access control storage for the server.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file helps the server keep out queries from outside sources, that
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* should not be answered.
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*/
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#include "config.h"
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#include "daemon/acl_list.h"
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#include "util/regional.h"
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#include "util/log.h"
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#include "util/config_file.h"
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#include "util/net_help.h"
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struct acl_list*
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acl_list_create(void)
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{
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struct acl_list* acl = (struct acl_list*)calloc(1,
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sizeof(struct acl_list));
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if(!acl)
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return NULL;
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acl->region = regional_create();
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if(!acl->region) {
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acl_list_delete(acl);
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return NULL;
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}
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return acl;
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}
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void
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acl_list_delete(struct acl_list* acl)
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{
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if(!acl)
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return;
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regional_destroy(acl->region);
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free(acl);
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}
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/** insert new address into acl_list structure */
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static int
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acl_list_insert(struct acl_list* acl, struct sockaddr_storage* addr,
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socklen_t addrlen, int net, enum acl_access control,
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int complain_duplicates)
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{
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struct acl_addr* node = regional_alloc(acl->region,
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sizeof(struct acl_addr));
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if(!node)
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return 0;
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node->control = control;
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if(!addr_tree_insert(&acl->tree, &node->node, addr, addrlen, net)) {
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if(complain_duplicates)
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verbose(VERB_QUERY, "duplicate acl address ignored.");
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}
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return 1;
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}
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/** apply acl_list string */
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static int
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acl_list_str_cfg(struct acl_list* acl, const char* str, const char* s2,
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int complain_duplicates)
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{
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struct sockaddr_storage addr;
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int net;
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socklen_t addrlen;
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enum acl_access control;
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if(strcmp(s2, "allow") == 0)
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control = acl_allow;
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else if(strcmp(s2, "deny") == 0)
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control = acl_deny;
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else if(strcmp(s2, "refuse") == 0)
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control = acl_refuse;
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else if(strcmp(s2, "deny_non_local") == 0)
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control = acl_deny_non_local;
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else if(strcmp(s2, "refuse_non_local") == 0)
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control = acl_refuse_non_local;
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else if(strcmp(s2, "allow_snoop") == 0)
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control = acl_allow_snoop;
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else {
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log_err("access control type %s unknown", str);
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return 0;
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}
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if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) {
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log_err("cannot parse access control: %s %s", str, s2);
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return 0;
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}
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if(!acl_list_insert(acl, &addr, addrlen, net, control,
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complain_duplicates)) {
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log_err("out of memory");
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return 0;
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}
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return 1;
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}
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/** read acl_list config */
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static int
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read_acl_list(struct acl_list* acl, struct config_file* cfg)
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{
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struct config_str2list* p;
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for(p = cfg->acls; p; p = p->next) {
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log_assert(p->str && p->str2);
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if(!acl_list_str_cfg(acl, p->str, p->str2, 1))
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return 0;
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}
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return 1;
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}
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int
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acl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg)
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{
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regional_free_all(acl->region);
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addr_tree_init(&acl->tree);
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if(!read_acl_list(acl, cfg))
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return 0;
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/* insert defaults, with '0' to ignore them if they are duplicates */
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if(!acl_list_str_cfg(acl, "0.0.0.0/0", "refuse", 0))
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return 0;
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if(!acl_list_str_cfg(acl, "127.0.0.0/8", "allow", 0))
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return 0;
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if(cfg->do_ip6) {
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if(!acl_list_str_cfg(acl, "::0/0", "refuse", 0))
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return 0;
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if(!acl_list_str_cfg(acl, "::1", "allow", 0))
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return 0;
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if(!acl_list_str_cfg(acl, "::ffff:127.0.0.1", "allow", 0))
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return 0;
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}
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addr_tree_init_parents(&acl->tree);
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return 1;
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}
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enum acl_access
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acl_list_lookup(struct acl_list* acl, struct sockaddr_storage* addr,
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socklen_t addrlen)
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{
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struct acl_addr* r = (struct acl_addr*)addr_tree_lookup(&acl->tree,
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addr, addrlen);
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if(r) return r->control;
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return acl_deny;
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}
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size_t
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acl_list_get_mem(struct acl_list* acl)
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{
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if(!acl) return 0;
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return sizeof(*acl) + regional_get_mem(acl->region);
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}
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