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/*
* Copyright (C) 2011-2013 Internet Systems Consortium, Inc. ("ISC")
*
* 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.
*/
/* $Id$ */
#ifndef DNS_RPZ_H
#define DNS_RPZ_H 1
#include <isc/lang.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
#define DNS_RPZ_PREFIX "rpz-"
#define DNS_RPZ_IP_ZONE DNS_RPZ_PREFIX"ip"
#define DNS_RPZ_NSIP_ZONE DNS_RPZ_PREFIX"nsip"
#define DNS_RPZ_NSDNAME_ZONE DNS_RPZ_PREFIX"nsdname"
#define DNS_RPZ_PASSTHRU_ZONE DNS_RPZ_PREFIX"passthru"
typedef isc_uint8_t dns_rpz_cidr_bits_t;
typedef enum {
DNS_RPZ_TYPE_BAD,
DNS_RPZ_TYPE_QNAME,
DNS_RPZ_TYPE_IP,
DNS_RPZ_TYPE_NSDNAME,
DNS_RPZ_TYPE_NSIP
} dns_rpz_type_t;
/*
* Require DNS_RPZ_POLICY_PASSTHRU < DNS_RPZ_POLICY_NXDOMAIN <
* DNS_RPZ_POLICY_NODATA < DNS_RPZ_POLICY_CNAME to choose among competing
* policies.
*/
typedef enum {
DNS_RPZ_POLICY_GIVEN = 0, /* 'given': what policy record says */
DNS_RPZ_POLICY_DISABLED = 1, /* 'cname x': answer with x's rrsets */
DNS_RPZ_POLICY_PASSTHRU = 2, /* 'passthru': do not rewrite */
DNS_RPZ_POLICY_NXDOMAIN = 3, /* 'nxdomain': answer with NXDOMAIN */
DNS_RPZ_POLICY_NODATA = 4, /* 'nodata': answer with ANCOUNT=0 */
DNS_RPZ_POLICY_CNAME = 5, /* 'cname x': answer with x's rrsets */
DNS_RPZ_POLICY_RECORD,
DNS_RPZ_POLICY_WILDCNAME,
DNS_RPZ_POLICY_MISS,
DNS_RPZ_POLICY_ERROR
} dns_rpz_policy_t;
/*
* Specify a response policy zone.
*/
typedef struct dns_rpz_zone dns_rpz_zone_t;
struct dns_rpz_zone {
ISC_LINK(dns_rpz_zone_t) link;
int num; /* ordinal in list of policy zones */
dns_name_t origin; /* Policy zone name */
dns_name_t nsdname; /* DNS_RPZ_NSDNAME_ZONE.origin */
dns_name_t passthru;/* DNS_RPZ_PASSTHRU_ZONE. */
dns_name_t cname; /* override value for ..._CNAME */
dns_ttl_t max_policy_ttl;
dns_rpz_policy_t policy; /* DNS_RPZ_POLICY_GIVEN or override */
isc_boolean_t recursive_only;
isc_boolean_t defined;
};
/*
* Radix trees for response policy IP addresses.
*/
typedef struct dns_rpz_cidr dns_rpz_cidr_t;
/*
* context for finding the best policy
*/
typedef struct {
unsigned int state;
# define DNS_RPZ_REWRITTEN 0x0001
# define DNS_RPZ_DONE_QNAME 0x0002 /* qname checked */
# define DNS_RPZ_DONE_QNAME_IP 0x0004 /* IP addresses of qname checked */
# define DNS_RPZ_DONE_NSDNAME 0x0008 /* NS name missed; checking addresses */
# define DNS_RPZ_DONE_IPv4 0x0010
# define DNS_RPZ_RECURSING 0x0020
# define DNS_RPZ_HAVE_IP 0x0040 /* a policy zone has IP addresses */
# define DNS_RPZ_HAVE_NSIPv4 0x0080 /* IPv4 NISP addresses */
# define DNS_RPZ_HAVE_NSIPv6 0x0100 /* IPv6 NISP addresses */
# define DNS_RPZ_HAVE_NSDNAME 0x0200 /* NS names */
/*
* Best match so far.
*/
struct {
dns_rpz_type_t type;
dns_rpz_zone_t *rpz;
dns_rpz_cidr_bits_t prefix;
dns_rpz_policy_t policy;
dns_ttl_t ttl;
isc_result_t result;
dns_zone_t *zone;
dns_db_t *db;
dns_dbversion_t *version;
dns_dbnode_t *node;
dns_rdataset_t *rdataset;
} m;
/*
* State for chasing IP addresses and NS names including recursion.
*/
struct {
unsigned int label;
dns_db_t *db;
dns_rdataset_t *ns_rdataset;
dns_rdatatype_t r_type;
isc_result_t r_result;
dns_rdataset_t *r_rdataset;
} r;
/*
* State of real query while recursing for NSIP or NSDNAME.
*/
struct {
isc_result_t result;
isc_boolean_t is_zone;
isc_boolean_t authoritative;
dns_zone_t *zone;
dns_db_t *db;
dns_dbnode_t *node;
dns_rdataset_t *rdataset;
dns_rdataset_t *sigrdataset;
dns_rdatatype_t qtype;
} q;
dns_name_t *qname;
dns_name_t *r_name;
dns_name_t *fname;
dns_fixedname_t _qnamef;
dns_fixedname_t _r_namef;
dns_fixedname_t _fnamef;
} dns_rpz_st_t;
#define DNS_RPZ_TTL_DEFAULT 5
#define DNS_RPZ_MAX_TTL_DEFAULT DNS_RPZ_TTL_DEFAULT
/*
* So various response policy zone messages can be turned up or down.
*/
#define DNS_RPZ_ERROR_LEVEL ISC_LOG_WARNING
#define DNS_RPZ_INFO_LEVEL ISC_LOG_INFO
#define DNS_RPZ_DEBUG_LEVEL1 ISC_LOG_DEBUG(1)
#define DNS_RPZ_DEBUG_LEVEL2 ISC_LOG_DEBUG(2)
#define DNS_RPZ_DEBUG_LEVEL3 ISC_LOG_DEBUG(3)
#define DNS_RPZ_DEBUG_QUIET (DNS_RPZ_DEBUG_LEVEL3+1)
const char *
dns_rpz_type2str(dns_rpz_type_t type);
dns_rpz_policy_t
dns_rpz_str2policy(const char *str);
const char *
dns_rpz_policy2str(dns_rpz_policy_t policy);
void
dns_rpz_cidr_free(dns_rpz_cidr_t **cidr);
void
dns_rpz_view_destroy(dns_view_t *view);
isc_result_t
dns_rpz_new_cidr(isc_mem_t *mctx, dns_name_t *origin,
dns_rpz_cidr_t **rbtdb_cidr);
void
dns_rpz_enabled_get(dns_rpz_cidr_t *cidr, dns_rpz_st_t *st);
void
dns_rpz_cidr_deleteip(dns_rpz_cidr_t *cidr, dns_name_t *name);
void
dns_rpz_cidr_addip(dns_rpz_cidr_t *cidr, dns_name_t *name);
isc_result_t
dns_rpz_cidr_find(dns_rpz_cidr_t *cidr, const isc_netaddr_t *netaddr,
dns_rpz_type_t type, dns_name_t *canon_name,
dns_name_t *search_name, dns_rpz_cidr_bits_t *prefix);
dns_rpz_policy_t
dns_rpz_decode_cname(dns_rpz_zone_t *rpz, dns_rdataset_t *rdataset,
dns_name_t *selfname);
ISC_LANG_ENDDECLS
#endif /* DNS_RPZ_H */
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