unbound/validator/validator.h
W.C.A. Wijngaards ff653a7ef8 Call module init init again, and new function startup and destartup.
NULL can be used if the function is not used. Open shared ports during
reload. Deinit is called during reload.
2024-07-01 16:10:07 +02:00

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C

/*
* validator/validator.h - secure validator DNS query response module
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains a module that performs validation of DNS queries.
* According to RFC 4034.
*/
#ifndef VALIDATOR_VALIDATOR_H
#define VALIDATOR_VALIDATOR_H
#include "util/module.h"
#include "util/data/msgreply.h"
#include "validator/val_utils.h"
#include "validator/val_nsec3.h"
struct val_anchors;
struct key_cache;
struct key_entry_key;
struct val_neg_cache;
struct config_strlist;
struct comm_timer;
/**
* This is the TTL to use when a trust anchor fails to prime. A trust anchor
* will be primed no more often than this interval. Used when harden-
* dnssec-stripped is off and the trust anchor fails.
*/
#define NULL_KEY_TTL 60 /* seconds */
/**
* TTL for bogus key entries. When a DS or DNSKEY fails in the chain of
* trust the entire zone for that name is blacked out for this TTL.
*/
#define BOGUS_KEY_TTL 60 /* seconds */
/** Root key sentinel is ta preamble */
#define SENTINEL_IS "root-key-sentinel-is-ta-"
/** Root key sentinel is not ta preamble */
#define SENTINEL_NOT "root-key-sentinel-not-ta-"
/** Root key sentinel keytag length */
#define SENTINEL_KEYTAG_LEN 5
/**
* Global state for the validator.
*/
struct val_env {
/** key cache; these are validated keys. trusted keys only
* end up here after being primed. */
struct key_cache* kcache;
/** aggressive negative cache. index into NSECs in rrset cache. */
struct val_neg_cache* neg_cache;
/** for debug testing a fixed validation date can be entered.
* if 0, current time is used for rrsig validation */
int32_t date_override;
/** clock skew min for signatures */
int32_t skew_min;
/** clock skew max for signatures */
int32_t skew_max;
/** max number of query restarts, number of IPs to probe */
int max_restart;
/** TTL for bogus data; used instead of untrusted TTL from data.
* Bogus data will not be verified more often than this interval.
* seconds. */
uint32_t bogus_ttl;
/**
* Number of entries in the NSEC3 maximum iteration count table.
* Keep this table short, and sorted by size
*/
int nsec3_keyiter_count;
/**
* NSEC3 maximum iteration count per signing key size.
* This array contains key size values (in increasing order)
*/
size_t* nsec3_keysize;
/**
* NSEC3 maximum iteration count per signing key size.
* This array contains the maximum iteration count for the keysize
* in the keysize array.
*/
size_t* nsec3_maxiter;
/** lock on bogus counter */
lock_basic_type bogus_lock;
/** number of times rrsets marked bogus */
size_t num_rrset_bogus;
};
/**
* State of the validator for a query.
*/
enum val_state {
/** initial state for validation */
VAL_INIT_STATE = 0,
/** find the proper keys for validation, follow trust chain */
VAL_FINDKEY_STATE,
/** validate the answer, using found key entry */
VAL_VALIDATE_STATE,
/** finish up */
VAL_FINISHED_STATE,
};
/**
* Per query state for the validator module.
*/
struct val_qstate {
/**
* State of the validator module.
*/
enum val_state state;
/**
* The original message we have been given to validate.
*/
struct dns_msg* orig_msg;
/**
* The query restart count
*/
int restart_count;
/** The blacklist saved for chainoftrust elements */
struct sock_list* chain_blacklist;
/**
* The query name we have chased to; qname after following CNAMEs
*/
struct query_info qchase;
/**
* The chased reply, extract from original message. Can be:
* o CNAME
* o DNAME + CNAME
* o answer
* plus authority, additional (nsecs) that have same signature.
*/
struct reply_info* chase_reply;
/**
* The cname skip value; the number of rrsets that have been skipped
* due to chasing cnames. This is the offset into the
* orig_msg->rep->rrsets array, into the answer section.
* starts at 0 - for the full original message.
* if it is >0 - qchase followed the cname, chase_reply setup to be
* that message and relevant authority rrsets.
*
* The skip is also used for referral messages, where it will
* range from 0, over the answer, authority and additional sections.
*/
size_t rrset_skip;
/** trust anchor name */
uint8_t* trust_anchor_name;
/** trust anchor labels */
int trust_anchor_labs;
/** trust anchor length */
size_t trust_anchor_len;
/** the DS rrset */
struct ub_packed_rrset_key* ds_rrset;
/** domain name for empty nonterminal detection */
uint8_t* empty_DS_name;
/** length of empty_DS_name */
size_t empty_DS_len;
/** the current key entry */
struct key_entry_key* key_entry;
/** subtype */
enum val_classification subtype;
/** signer name */
uint8_t* signer_name;
/** length of signer_name */
size_t signer_len;
/** true if this state is waiting to prime a trust anchor */
int wait_prime_ta;
/** State to continue with RRSIG validation in a message later */
int msg_signatures_state;
/** The rrset index for the msg signatures to continue from */
size_t msg_signatures_index;
/** Cache table for NSEC3 hashes */
struct nsec3_cache_table nsec3_cache_table;
/** DS message from sub if it got suspended from NSEC3 calculations */
struct dns_msg* sub_ds_msg;
/** The timer to resume processing msg signatures */
struct comm_timer* suspend_timer;
/** Number of suspends */
int suspend_count;
};
/**
* Get the validator function block.
* @return: function block with function pointers to validator methods.
*/
struct module_func_block* val_get_funcblock(void);
/**
* Get validator state as a string
* @param state: to convert
* @return constant string that is printable.
*/
const char* val_state_to_string(enum val_state state);
/** validator init */
int val_init(struct module_env* env, int id);
/** validator deinit */
void val_deinit(struct module_env* env, int id);
/** validator operate on a query */
void val_operate(struct module_qstate* qstate, enum module_ev event, int id,
struct outbound_entry* outbound);
/**
* inform validator super.
*
* @param qstate: query state that finished.
* @param id: module id.
* @param super: the qstate to inform.
*/
void val_inform_super(struct module_qstate* qstate, int id,
struct module_qstate* super);
/** validator cleanup query state */
void val_clear(struct module_qstate* qstate, int id);
/**
* Debug helper routine that assists worker in determining memory in
* use.
* @param env: module environment
* @param id: module id.
* @return memory in use in bytes.
*/
size_t val_get_mem(struct module_env* env, int id);
/** Timer callback for msg signatures continue timer */
void validate_suspend_timer_cb(void* arg);
#endif /* VALIDATOR_VALIDATOR_H */