00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/* $NetBSD: acl.h,v 1.6 2014/12/10 04:37:58 christos Exp $ */
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/*
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* Copyright (C) 2004-2007, 2009, 2011, 2013, 2014 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2002 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: acl.h,v 1.35 2011/06/17 23:47:49 tbox Exp */
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#ifndef DNS_ACL_H
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#define DNS_ACL_H 1
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/*****
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***** Module Info
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*****/
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/*! \file dns/acl.h
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* \brief
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* Address match list handling.
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*/
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/***
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*** Imports
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***/
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#include <isc/lang.h>
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#include <isc/magic.h>
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#include <isc/netaddr.h>
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#include <isc/refcount.h>
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#ifdef HAVE_GEOIP
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#include <dns/geoip.h>
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#endif
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#include <dns/name.h>
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#include <dns/types.h>
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#include <dns/iptable.h>
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#ifdef HAVE_GEOIP
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#include <GeoIP.h>
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#endif
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/***
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*** Types
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***/
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typedef enum {
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dns_aclelementtype_ipprefix,
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dns_aclelementtype_keyname,
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dns_aclelementtype_nestedacl,
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dns_aclelementtype_localhost,
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dns_aclelementtype_localnets,
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#ifdef HAVE_GEOIP
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dns_aclelementtype_geoip,
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#endif /* HAVE_GEOIP */
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dns_aclelementtype_any
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} dns_aclelementtype_t;
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typedef struct dns_aclipprefix dns_aclipprefix_t;
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struct dns_aclipprefix {
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isc_netaddr_t address; /* IP4/IP6 */
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unsigned int prefixlen;
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};
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struct dns_aclelement {
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dns_aclelementtype_t type;
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isc_boolean_t negative;
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dns_name_t keyname;
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#ifdef HAVE_GEOIP
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dns_geoip_elem_t geoip_elem;
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#endif /* HAVE_GEOIP */
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dns_acl_t *nestedacl;
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int node_num;
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};
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struct dns_acl {
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unsigned int magic;
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isc_mem_t *mctx;
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isc_refcount_t refcount;
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dns_iptable_t *iptable;
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#define node_count iptable->radix->num_added_node
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dns_aclelement_t *elements;
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isc_boolean_t has_negatives;
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unsigned int alloc; /*%< Elements allocated */
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unsigned int length; /*%< Elements initialized */
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char *name; /*%< Temporary use only */
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ISC_LINK(dns_acl_t) nextincache; /*%< Ditto */
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};
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struct dns_aclenv {
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dns_acl_t *localhost;
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dns_acl_t *localnets;
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isc_boolean_t match_mapped;
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#ifdef HAVE_GEOIP
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dns_geoip_databases_t *geoip;
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#endif
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};
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#define DNS_ACL_MAGIC ISC_MAGIC('D','a','c','l')
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#define DNS_ACL_VALID(a) ISC_MAGIC_VALID(a, DNS_ACL_MAGIC)
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/***
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*** Functions
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***/
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ISC_LANG_BEGINDECLS
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isc_result_t
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dns_acl_create(isc_mem_t *mctx, int n, dns_acl_t **target);
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/*%<
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* Create a new ACL, including an IP table and an array with room
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* for 'n' ACL elements. The elements are uninitialized and the
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* length is 0.
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*/
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isc_result_t
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dns_acl_any(isc_mem_t *mctx, dns_acl_t **target);
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/*%<
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* Create a new ACL that matches everything.
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*/
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isc_result_t
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dns_acl_none(isc_mem_t *mctx, dns_acl_t **target);
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/*%<
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* Create a new ACL that matches nothing.
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*/
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isc_boolean_t
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dns_acl_isany(dns_acl_t *acl);
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/*%<
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* Test whether ACL is set to "{ any; }"
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*/
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isc_boolean_t
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dns_acl_isnone(dns_acl_t *acl);
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/*%<
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* Test whether ACL is set to "{ none; }"
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*/
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isc_result_t
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dns_acl_merge(dns_acl_t *dest, dns_acl_t *source, isc_boolean_t pos);
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/*%<
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* Merge the contents of one ACL into another. Call dns_iptable_merge()
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* for the IP tables, then concatenate the element arrays.
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*
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* If pos is set to false, then the nested ACL is to be negated. This
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* means reverse the sense of each *positive* element or IP table node,
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* but leave negatives alone, so as to prevent a double-negative causing
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* an unexpected positive match in the parent ACL.
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*/
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void
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dns_acl_attach(dns_acl_t *source, dns_acl_t **target);
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/*%<
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* Attach to acl 'source'.
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*
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* Requires:
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*\li 'source' to be a valid acl.
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*\li 'target' to be non NULL and '*target' to be NULL.
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*/
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void
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dns_acl_detach(dns_acl_t **aclp);
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/*%<
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* Detach the acl. On final detach the acl must not be linked on any
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* list.
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*
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* Requires:
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*\li '*aclp' to be a valid acl.
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*
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* Insists:
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*\li '*aclp' is not linked on final detach.
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*/
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isc_boolean_t
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dns_acl_isinsecure(const dns_acl_t *a);
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/*%<
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* Return #ISC_TRUE iff the acl 'a' is considered insecure, that is,
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* if it contains IP addresses other than those of the local host.
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* This is intended for applications such as printing warning
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* messages for suspect ACLs; it is not intended for making access
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* control decisions. We make no guarantee that an ACL for which
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* this function returns #ISC_FALSE is safe.
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*/
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isc_result_t
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dns_aclenv_init(isc_mem_t *mctx, dns_aclenv_t *env);
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/*%<
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* Initialize ACL environment, setting up localhost and localnets ACLs
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*/
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void
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dns_aclenv_copy(dns_aclenv_t *t, dns_aclenv_t *s);
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void
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dns_aclenv_destroy(dns_aclenv_t *env);
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isc_result_t
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dns_acl_match(const isc_netaddr_t *reqaddr,
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const dns_name_t *reqsigner,
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const dns_acl_t *acl,
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const dns_aclenv_t *env,
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int *match,
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const dns_aclelement_t **matchelt);
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/*%<
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* General, low-level ACL matching. This is expected to
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* be useful even for weird stuff like the topology and sortlist statements.
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*
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* Match the address 'reqaddr', and optionally the key name 'reqsigner',
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* against 'acl'. 'reqsigner' may be NULL.
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*
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* If there is a match, '*match' will be set to an integer whose absolute
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* value corresponds to the order in which the matching value was inserted
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* into the ACL. For a positive match, this value will be positive; for a
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* negative match, it will be negative.
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*
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* If there is no match, *match will be set to zero.
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*
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* If there is a match in the element list (either positive or negative)
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* and 'matchelt' is non-NULL, *matchelt will be pointed to the matching
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* element.
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*
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* 'env' points to the current ACL environment, including the
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* current values of localhost and localnets and (if applicable)
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* the GeoIP context.
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*
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* Returns:
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*\li #ISC_R_SUCCESS Always succeeds.
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*/
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isc_boolean_t
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dns_aclelement_match(const isc_netaddr_t *reqaddr,
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const dns_name_t *reqsigner,
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const dns_aclelement_t *e,
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const dns_aclenv_t *env,
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const dns_aclelement_t **matchelt);
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/*%<
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* Like dns_acl_match, but matches against the single ACL element 'e'
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* rather than a complete ACL, and returns ISC_TRUE iff it matched.
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*
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* To determine whether the match was positive or negative, the
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* caller should examine e->negative. Since the element 'e' may be
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* a reference to a named ACL or a nested ACL, a matching element
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* returned through 'matchelt' is not necessarily 'e' itself.
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*/
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ISC_LANG_ENDDECLS
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#endif /* DNS_ACL_H */
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