From f50ae72ec3417cae55dd4e085991c01af9fdc5f1 Mon Sep 17 00:00:00 2001 From: Martin Nagy Date: Wed, 11 Feb 2009 20:37:59 +0100 Subject: Initial commit --- lib/dns/include/dns/acl.h | 222 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 lib/dns/include/dns/acl.h (limited to 'lib/dns/include/dns/acl.h') diff --git a/lib/dns/include/dns/acl.h b/lib/dns/include/dns/acl.h new file mode 100644 index 0000000..94537a5 --- /dev/null +++ b/lib/dns/include/dns/acl.h @@ -0,0 +1,222 @@ +/* + * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2002 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: acl.h,v 1.31 2007/12/21 06:46:47 marka Exp $ */ + +#ifndef DNS_ACL_H +#define DNS_ACL_H 1 + +/***** + ***** Module Info + *****/ + +/*! \file dns/acl.h + * \brief + * Address match list handling. + */ + +/*** + *** Imports + ***/ + +#include +#include +#include +#include + +#include +#include +#include + +/*** + *** Types + ***/ + +typedef enum { + dns_aclelementtype_ipprefix, + dns_aclelementtype_keyname, + dns_aclelementtype_nestedacl, + dns_aclelementtype_localhost, + dns_aclelementtype_localnets, + dns_aclelementtype_any +} dns_aclelemettype_t; + +typedef struct dns_aclipprefix dns_aclipprefix_t; + +struct dns_aclipprefix { + isc_netaddr_t address; /* IP4/IP6 */ + unsigned int prefixlen; +}; + +struct dns_aclelement { + dns_aclelemettype_t type; + isc_boolean_t negative; + dns_name_t keyname; + dns_acl_t *nestedacl; + int node_num; +}; + +struct dns_acl { + unsigned int magic; + isc_mem_t *mctx; + isc_refcount_t refcount; + dns_iptable_t *iptable; +#define node_count iptable->radix->num_added_node + dns_aclelement_t *elements; + isc_boolean_t has_negatives; + unsigned int alloc; /*%< Elements allocated */ + unsigned int length; /*%< Elements initialized */ + char *name; /*%< Temporary use only */ + ISC_LINK(dns_acl_t) nextincache; /*%< Ditto */ +}; + +struct dns_aclenv { + dns_acl_t *localhost; + dns_acl_t *localnets; + isc_boolean_t match_mapped; +}; + +#define DNS_ACL_MAGIC ISC_MAGIC('D','a','c','l') +#define DNS_ACL_VALID(a) ISC_MAGIC_VALID(a, DNS_ACL_MAGIC) + +/*** + *** Functions + ***/ + +ISC_LANG_BEGINDECLS + +isc_result_t +dns_acl_create(isc_mem_t *mctx, int n, dns_acl_t **target); +/*%< + * Create a new ACL, including an IP table and an array with room + * for 'n' ACL elements. The elements are uninitialized and the + * length is 0. + */ + +isc_result_t +dns_acl_any(isc_mem_t *mctx, dns_acl_t **target); +/*%< + * Create a new ACL that matches everything. + */ + +isc_result_t +dns_acl_none(isc_mem_t *mctx, dns_acl_t **target); +/*%< + * Create a new ACL that matches nothing. + */ + +isc_boolean_t +dns_acl_isany(dns_acl_t *acl); +/*%< + * Test whether ACL is set to "{ any; }" + */ + +isc_boolean_t +dns_acl_isnone(dns_acl_t *acl); +/*%< + * Test whether ACL is set to "{ none; }" + */ + +isc_result_t +dns_acl_merge(dns_acl_t *dest, dns_acl_t *source, isc_boolean_t pos); +/*%< + * Merge the contents of one ACL into another. Call dns_iptable_merge() + * for the IP tables, then concatenate the element arrays. + * + * If pos is set to false, then the nested ACL is to be negated. This + * means reverse the sense of each *positive* element or IP table node, + * but leave negatives alone, so as to prevent a double-negative causing + * an unexpected postive match in the parent ACL. + */ + +void +dns_acl_attach(dns_acl_t *source, dns_acl_t **target); + +void +dns_acl_detach(dns_acl_t **aclp); + +isc_boolean_t +dns_acl_isinsecure(const dns_acl_t *a); +/*%< + * Return #ISC_TRUE iff the acl 'a' is considered insecure, that is, + * if it contains IP addresses other than those of the local host. + * This is intended for applications such as printing warning + * messages for suspect ACLs; it is not intended for making access + * control decisions. We make no guarantee that an ACL for which + * this function returns #ISC_FALSE is safe. + */ + +isc_result_t +dns_aclenv_init(isc_mem_t *mctx, dns_aclenv_t *env); +/*%< + * Initialize ACL environment, setting up localhost and localnets ACLs + */ + +void +dns_aclenv_copy(dns_aclenv_t *t, dns_aclenv_t *s); + +void +dns_aclenv_destroy(dns_aclenv_t *env); + +isc_result_t +dns_acl_match(const isc_netaddr_t *reqaddr, + const dns_name_t *reqsigner, + const dns_acl_t *acl, + const dns_aclenv_t *env, + int *match, + const dns_aclelement_t **matchelt); +/*%< + * General, low-level ACL matching. This is expected to + * be useful even for weird stuff like the topology and sortlist statements. + * + * Match the address 'reqaddr', and optionally the key name 'reqsigner', + * against 'acl'. 'reqsigner' may be NULL. + * + * If there is a match, '*match' will be set to an integer whose absolute + * value corresponds to the order in which the matching value was inserted + * into the ACL. For a positive match, this value will be positive; for a + * negative match, it will be negative. + * + * If there is no match, *match will be set to zero. + * + * If there is a match in the element list (either positive or negative) + * and 'matchelt' is non-NULL, *matchelt will be pointed to the matching + * element. + * + * Returns: + *\li #ISC_R_SUCCESS Always succeeds. + */ + +isc_boolean_t +dns_aclelement_match(const isc_netaddr_t *reqaddr, + const dns_name_t *reqsigner, + const dns_aclelement_t *e, + const dns_aclenv_t *env, + const dns_aclelement_t **matchelt); +/*%< + * Like dns_acl_match, but matches against the single ACL element 'e' + * rather than a complete ACL, and returns ISC_TRUE iff it matched. + * + * To determine whether the match was prositive or negative, the + * caller should examine e->negative. Since the element 'e' may be + * a reference to a named ACL or a nested ACL, a matching element + * returned through 'matchelt' is not necessarily 'e' itself. + */ + +ISC_LANG_ENDDECLS + +#endif /* DNS_ACL_H */ -- cgit