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/*
* validator/autotrust.h - RFC5011 trust anchor management for unbound.
*
* Copyright (c) 2009, 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
*
* Contains autotrust definitions.
*/
#ifndef VALIDATOR_AUTOTRUST_H
#define VALIDATOR_AUTOTRUST_H
#include "util/rbtree.h"
#include "util/data/packed_rrset.h"
struct val_anchors;
struct trust_anchor;
struct ub_packed_rrset_key;
struct module_env;
struct val_env;
struct sldns_buffer;
/** Autotrust anchor states */
typedef enum {
AUTR_STATE_START = 0,
AUTR_STATE_ADDPEND = 1,
AUTR_STATE_VALID = 2,
AUTR_STATE_MISSING = 3,
AUTR_STATE_REVOKED = 4,
AUTR_STATE_REMOVED = 5
} autr_state_t;
/**
* Autotrust metadata for one trust anchor key.
*/
struct autr_ta {
/** next key */
struct autr_ta* next;
/** the RR */
uint8_t* rr;
/** length of rr */
size_t rr_len, dname_len;
/** last update of key state (new pending count keeps date the same) */
time_t last_change;
/** 5011 state */
autr_state_t s;
/** pending count */
uint8_t pending_count;
/** fresh TA was seen */
uint8_t fetched;
/** revoked TA was seen */
uint8_t revoked;
};
/**
* Autotrust metadata for a trust point.
* This is part of the struct trust_anchor data.
*/
struct autr_point_data {
/** file to store the trust point in. chrootdir already applied. */
char* file;
/** rbtree node for probe sort, key is struct trust_anchor */
rbnode_t pnode;
/** the keys */
struct autr_ta* keys;
/** last queried DNSKEY set
* Not all failures are captured in this entry.
* If the validator did not even start (e.g. timeout or localservfail),
* then the last_queried and query_failed values are not updated.
*/
time_t last_queried;
/** last successful DNSKEY set */
time_t last_success;
/** next probe time */
time_t next_probe_time;
/** when to query if !failed */
time_t query_interval;
/** when to retry if failed */
time_t retry_time;
/**
* How many times did it fail. diagnostic only (has no effect).
* Only updated if there was a dnskey rrset that failed to verify.
*/
uint8_t query_failed;
/** true if the trust point has been revoked */
uint8_t revoked;
};
/**
* Autotrust global metadata.
*/
struct autr_global_data {
/** rbtree of autotrust anchors sorted by next probe time.
* When time is equal, sorted by anchor class, name. */
rbtree_t probe;
};
/**
* Create new global 5011 data structure.
* @return new structure or NULL on malloc failure.
*/
struct autr_global_data* autr_global_create(void);
/**
* Delete global 5011 data structure.
* @param global: global autotrust state to delete.
*/
void autr_global_delete(struct autr_global_data* global);
/**
* See if autotrust anchors are configured and how many.
* @param anchors: the trust anchors structure.
* @return number of autotrust trust anchors
*/
size_t autr_get_num_anchors(struct val_anchors* anchors);
/**
* Process probe timer. Add new probes if needed.
* @param env: module environment with time, with anchors and with the mesh.
* @return time of next probe (in seconds from now).
* If 0, then there is no next probe anymore (trust points deleted).
*/
time_t autr_probe_timer(struct module_env* env);
/** probe tree compare function */
int probetree_cmp(const void* x, const void* y);
/**
* Read autotrust file.
* @param anchors: the anchors structure.
* @param nm: name of the file (copied).
* @return false on failure.
*/
int autr_read_file(struct val_anchors* anchors, const char* nm);
/**
* Write autotrust file.
* @param env: environment with scratch space.
* @param tp: trust point to write.
*/
void autr_write_file(struct module_env* env, struct trust_anchor* tp);
/**
* Delete autr anchor, deletes the autr data but does not do
* unlinking from trees, caller does that.
* @param tp: trust point to delete.
*/
void autr_point_delete(struct trust_anchor* tp);
/**
* Perform autotrust processing.
* @param env: qstate environment with the anchors structure.
* @param ve: validator environment for verification of rrsigs.
* @param tp: trust anchor to process.
* @param dnskey_rrset: DNSKEY rrset probed (can be NULL if bad prime result).
* allocated in a region. Has not been validated yet.
* @return false if trust anchor was revoked completely.
* Otherwise logs errors to log, does not change return value.
* On errors, likely the trust point has been unchanged.
*/
int autr_process_prime(struct module_env* env, struct val_env* ve,
struct trust_anchor* tp, struct ub_packed_rrset_key* dnskey_rrset);
/**
* Debug printout of rfc5011 tracked anchors
* @param anchors: all the anchors.
*/
void autr_debug_print(struct val_anchors* anchors);
/** callback for query answer to 5011 probe */
void probe_answer_cb(void* arg, int rcode, struct sldns_buffer* buf,
enum sec_status sec, char* errinf);
#endif /* VALIDATOR_AUTOTRUST_H */
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