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/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef DNS_RPZ_H #define DNS_RPZ_H 1 #include <inttypes.h> #include <stdbool.h> #include <isc/deprecated.h> #include <isc/event.h> #include <isc/ht.h> #include <isc/lang.h> #include <isc/refcount.h> #include <isc/rwlock.h> #include <isc/time.h> #include <isc/timer.h> #include <dns/fixedname.h> #include <dns/rdata.h> #include <dns/types.h> ISC_LANG_BEGINDECLS #define DNS_RPZ_PREFIX "rpz-" /* * Sub-zones of various trigger types. */ #define DNS_RPZ_CLIENT_IP_ZONE DNS_RPZ_PREFIX "client-ip" #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" /* * Special policies. */ #define DNS_RPZ_PASSTHRU_NAME DNS_RPZ_PREFIX "passthru" #define DNS_RPZ_DROP_NAME DNS_RPZ_PREFIX "drop" #define DNS_RPZ_TCP_ONLY_NAME DNS_RPZ_PREFIX "tcp-only" typedef uint8_t dns_rpz_prefix_t; typedef enum { DNS_RPZ_TYPE_BAD, DNS_RPZ_TYPE_CLIENT_IP, 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_DROP * < DNS_RPZ_POLICY_TCP_ONLY 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, /* log what would have happened */ DNS_RPZ_POLICY_PASSTHRU = 2, /* 'passthru': do not rewrite */ DNS_RPZ_POLICY_DROP = 3, /* 'drop': do not respond */ DNS_RPZ_POLICY_TCP_ONLY = 4, /* 'tcp-only': answer UDP with TC=1 */ DNS_RPZ_POLICY_NXDOMAIN = 5, /* 'nxdomain': answer with NXDOMAIN */ DNS_RPZ_POLICY_NODATA = 6, /* 'nodata': answer with ANCOUNT=0 */ DNS_RPZ_POLICY_CNAME = 7, /* 'cname x': answer with x's rrsets */ DNS_RPZ_POLICY_DNS64, /* Apply DN64 to the A rewrite */ DNS_RPZ_POLICY_RECORD, DNS_RPZ_POLICY_WILDCNAME, DNS_RPZ_POLICY_MISS, DNS_RPZ_POLICY_ERROR } dns_rpz_policy_t; typedef uint8_t dns_rpz_num_t; #define DNS_RPZ_MAX_ZONES 64 /* * Type dns_rpz_zbits_t must be an unsigned int wide enough to contain * at least DNS_RPZ_MAX_ZONES bits. */ typedef uint64_t dns_rpz_zbits_t; #define DNS_RPZ_ALL_ZBITS ((dns_rpz_zbits_t)-1) #define DNS_RPZ_INVALID_NUM DNS_RPZ_MAX_ZONES #define DNS_RPZ_ZBIT(n) (((dns_rpz_zbits_t)1) << (dns_rpz_num_t)(n)) /* * Mask of the specified and higher numbered policy zones * Avoid hassles with (1<<33) or (1<<65) */ #define DNS_RPZ_ZMASK(n) \ ((dns_rpz_zbits_t)((((n) >= DNS_RPZ_MAX_ZONES - 1) \ ? 0 \ : (1ULL << ((n) + 1))) - \ 1)) /* * The trigger counter type. */ typedef size_t dns_rpz_trigger_counter_t; /* * The number of triggers of each type in a response policy zone. */ typedef struct dns_rpz_triggers dns_rpz_triggers_t; struct dns_rpz_triggers { dns_rpz_trigger_counter_t client_ipv4; dns_rpz_trigger_counter_t client_ipv6; dns_rpz_trigger_counter_t qname; dns_rpz_trigger_counter_t ipv4; dns_rpz_trigger_counter_t ipv6; dns_rpz_trigger_counter_t nsdname; dns_rpz_trigger_counter_t nsipv4; dns_rpz_trigger_counter_t nsipv6; }; /* * A single response policy zone. */ typedef struct dns_rpz_zone dns_rpz_zone_t; typedef struct dns_rpz_zones dns_rpz_zones_t; struct dns_rpz_zone { isc_refcount_t refs; dns_rpz_num_t num; /* ordinal in list of policy zones */ dns_name_t origin; /* Policy zone name */ dns_name_t client_ip; /* DNS_RPZ_CLIENT_IP_ZONE.origin. */ dns_name_t ip; /* DNS_RPZ_IP_ZONE.origin. */ dns_name_t nsdname; /* DNS_RPZ_NSDNAME_ZONE.origin */ dns_name_t nsip; /* DNS_RPZ_NSIP_ZONE.origin. */ dns_name_t passthru; /* DNS_RPZ_PASSTHRU_NAME. */ dns_name_t drop; /* DNS_RPZ_DROP_NAME. */ dns_name_t tcp_only; /* DNS_RPZ_TCP_ONLY_NAME. */ 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 */ uint32_t min_update_interval; /* minimal interval between * updates */ isc_ht_t *nodes; /* entries in zone */ dns_rpz_zones_t *rpzs; /* owner */ isc_time_t lastupdated; /* last time the zone was processed * */ bool updatepending; /* there is an update * pending/waiting */ bool updaterunning; /* there is an update running */ dns_db_t *db; /* zones database */ dns_dbversion_t *dbversion; /* version we will be updating to */ dns_db_t *updb; /* zones database we're working on */ dns_dbversion_t *updbversion; /* version we're currently working * on */ dns_dbiterator_t *updbit; /* iterator to use when updating */ isc_ht_t *newnodes; /* entries in zone being updated */ bool db_registered; /* is the notify event * registered? */ bool addsoa; /* add soa to the additional section */ isc_timer_t *updatetimer; isc_event_t updateevent; }; /* * Radix tree node for response policy IP addresses */ typedef struct dns_rpz_cidr_node dns_rpz_cidr_node_t; /* * Bitfields indicating which policy zones have policies of * which type. */ typedef struct dns_rpz_have dns_rpz_have_t; struct dns_rpz_have { dns_rpz_zbits_t client_ipv4; dns_rpz_zbits_t client_ipv6; dns_rpz_zbits_t client_ip; dns_rpz_zbits_t qname; dns_rpz_zbits_t ipv4; dns_rpz_zbits_t ipv6; dns_rpz_zbits_t ip; dns_rpz_zbits_t nsdname; dns_rpz_zbits_t nsipv4; dns_rpz_zbits_t nsipv6; dns_rpz_zbits_t nsip; dns_rpz_zbits_t qname_skip_recurse; }; /* * Policy options */ typedef struct dns_rpz_popt dns_rpz_popt_t; struct dns_rpz_popt { dns_rpz_zbits_t no_rd_ok; dns_rpz_zbits_t no_log; dns_rpz_zbits_t nsip_on; dns_rpz_zbits_t nsdname_on; bool dnsrps_enabled; bool break_dnssec; bool qname_wait_recurse; bool nsip_wait_recurse; unsigned int min_ns_labels; dns_rpz_num_t num_zones; }; /* * Response policy zones known to a view. */ struct dns_rpz_zones { dns_rpz_popt_t p; dns_rpz_zone_t *zones[DNS_RPZ_MAX_ZONES]; dns_rpz_triggers_t triggers[DNS_RPZ_MAX_ZONES]; /* * RPZ policy version number. * It is initially 0 and it increases whenever the server is * reconfigured with new zones or policy. */ int rpz_ver; dns_rpz_zbits_t defined; /* * The set of records for a policy zone are in one of these states: * never loaded load_begun=0 have=0 * during initial loading load_begun=1 have=0 * and rbtdb->rpzsp == rbtdb->load_rpzsp * after good load load_begun=1 have!=0 * after failed initial load load_begun=1 have=0 * and rbtdb->load_rpzsp == NULL * reloading after failure load_begun=1 have=0 * reloading after success * main rpzs load_begun=1 have!=0 * load rpzs load_begun=1 have=0 */ dns_rpz_zbits_t load_begun; dns_rpz_have_t have; /* * total_triggers maintains the total number of triggers in all * policy zones in the view. It is only used to print summary * statistics after a zone load of how the trigger counts * changed. */ dns_rpz_triggers_t total_triggers; isc_mem_t *mctx; isc_taskmgr_t *taskmgr; isc_timermgr_t *timermgr; isc_task_t *updater; isc_refcount_t refs; isc_refcount_t irefs; /* * One lock for short term read-only search that guarantees the * consistency of the pointers. * A second lock for maintenance that guarantees no other thread * is adding or deleting nodes. */ isc_rwlock_t search_lock; isc_mutex_t maint_lock; dns_rpz_cidr_node_t *cidr; dns_rbt_t *rbt; /* * DNSRPZ librpz configuration string and handle on librpz connection */ char *rps_cstr; size_t rps_cstr_size; struct librpz_client *rps_client; }; /* * context for finding the best policy */ typedef struct { unsigned int state; #define DNS_RPZ_REWRITTEN 0x0001 #define DNS_RPZ_DONE_CLIENT_IP 0x0002 /* client IP address checked */ #define DNS_RPZ_DONE_QNAME 0x0004 /* qname checked */ #define DNS_RPZ_DONE_QNAME_IP 0x0008 /* IP addresses of qname checked */ #define DNS_RPZ_DONE_NSDNAME 0x0010 /* NS name missed; checking addresses */ #define DNS_RPZ_DONE_IPv4 0x0020 #define DNS_RPZ_RECURSING 0x0040 #define DNS_RPZ_ACTIVE 0x0080 /* * Best match so far. */ struct { dns_rpz_type_t type; dns_rpz_zone_t *rpz; dns_rpz_prefix_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; bool is_zone; bool 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; /* * A copy of the 'have' and 'p' structures and the RPZ * policy version as of the beginning of RPZ processing, * used to avoid problems when policy is updated while * RPZ recursion is ongoing. */ dns_rpz_have_t have; dns_rpz_popt_t popt; int rpz_ver; /* * Shim db between BIND and DNRPS librpz. */ dns_db_t *rpsdb; /* * p_name: current policy owner name * r_name: recursing for this name to possible policy triggers * f_name: saved found name from before recursion */ dns_name_t *p_name; dns_name_t *r_name; dns_name_t *fname; dns_fixedname_t _p_namef; 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 #define DNS_RPZ_MINUPDATEINTERVAL_DEFAULT 60 /* * 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); dns_rpz_policy_t dns_rpz_decode_cname(dns_rpz_zone_t *rpz, dns_rdataset_t *rdataset, dns_name_t *selfname); isc_result_t dns_rpz_new_zones(dns_rpz_zones_t **rpzsp, char *rps_cstr, size_t rps_cstr_size, isc_mem_t *mctx, isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr); isc_result_t dns_rpz_new_zone(dns_rpz_zones_t *rpzs, dns_rpz_zone_t **rpzp); isc_result_t dns_rpz_dbupdate_callback(dns_db_t *db, void *fn_arg); void dns_rpz_attach_rpzs(dns_rpz_zones_t *source, dns_rpz_zones_t **target); void dns_rpz_detach_rpzs(dns_rpz_zones_t **rpzsp); isc_result_t dns_rpz_beginload(dns_rpz_zones_t **load_rpzsp, dns_rpz_zones_t *rpzs, dns_rpz_num_t rpz_num) ISC_DEPRECATED; isc_result_t dns_rpz_ready(dns_rpz_zones_t *rpzs, dns_rpz_zones_t **load_rpzsp, dns_rpz_num_t rpz_num) ISC_DEPRECATED; isc_result_t dns_rpz_add(dns_rpz_zones_t *rpzs, dns_rpz_num_t rpz_num, const dns_name_t *name); void dns_rpz_delete(dns_rpz_zones_t *rpzs, dns_rpz_num_t rpz_num, const dns_name_t *name); dns_rpz_num_t dns_rpz_find_ip(dns_rpz_zones_t *rpzs, dns_rpz_type_t rpz_type, dns_rpz_zbits_t zbits, const isc_netaddr_t *netaddr, dns_name_t *ip_name, dns_rpz_prefix_t *prefixp); dns_rpz_zbits_t dns_rpz_find_name(dns_rpz_zones_t *rpzs, dns_rpz_type_t rpz_type, dns_rpz_zbits_t zbits, dns_name_t *trig_name); ISC_LANG_ENDDECLS #endif /* DNS_RPZ_H */